| File: | build/source/clang/lib/Sema/SemaExpr.cpp |
| Warning: | line 9974, column 27 Called C++ object pointer is null |
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| 1 | //===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===// |
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | // |
| 9 | // This file implements semantic analysis for expressions. |
| 10 | // |
| 11 | //===----------------------------------------------------------------------===// |
| 12 | |
| 13 | #include "TreeTransform.h" |
| 14 | #include "UsedDeclVisitor.h" |
| 15 | #include "clang/AST/ASTConsumer.h" |
| 16 | #include "clang/AST/ASTContext.h" |
| 17 | #include "clang/AST/ASTLambda.h" |
| 18 | #include "clang/AST/ASTMutationListener.h" |
| 19 | #include "clang/AST/CXXInheritance.h" |
| 20 | #include "clang/AST/DeclObjC.h" |
| 21 | #include "clang/AST/DeclTemplate.h" |
| 22 | #include "clang/AST/Designator.h" |
| 23 | #include "clang/AST/EvaluatedExprVisitor.h" |
| 24 | #include "clang/AST/Expr.h" |
| 25 | #include "clang/AST/ExprCXX.h" |
| 26 | #include "clang/AST/ExprObjC.h" |
| 27 | #include "clang/AST/ExprOpenMP.h" |
| 28 | #include "clang/AST/OperationKinds.h" |
| 29 | #include "clang/AST/ParentMapContext.h" |
| 30 | #include "clang/AST/RecursiveASTVisitor.h" |
| 31 | #include "clang/AST/Type.h" |
| 32 | #include "clang/AST/TypeLoc.h" |
| 33 | #include "clang/Basic/Builtins.h" |
| 34 | #include "clang/Basic/DiagnosticSema.h" |
| 35 | #include "clang/Basic/PartialDiagnostic.h" |
| 36 | #include "clang/Basic/SourceManager.h" |
| 37 | #include "clang/Basic/Specifiers.h" |
| 38 | #include "clang/Basic/TargetInfo.h" |
| 39 | #include "clang/Lex/LiteralSupport.h" |
| 40 | #include "clang/Lex/Preprocessor.h" |
| 41 | #include "clang/Sema/AnalysisBasedWarnings.h" |
| 42 | #include "clang/Sema/DeclSpec.h" |
| 43 | #include "clang/Sema/DelayedDiagnostic.h" |
| 44 | #include "clang/Sema/Initialization.h" |
| 45 | #include "clang/Sema/Lookup.h" |
| 46 | #include "clang/Sema/Overload.h" |
| 47 | #include "clang/Sema/ParsedTemplate.h" |
| 48 | #include "clang/Sema/Scope.h" |
| 49 | #include "clang/Sema/ScopeInfo.h" |
| 50 | #include "clang/Sema/SemaFixItUtils.h" |
| 51 | #include "clang/Sema/SemaInternal.h" |
| 52 | #include "clang/Sema/Template.h" |
| 53 | #include "llvm/ADT/STLExtras.h" |
| 54 | #include "llvm/ADT/StringExtras.h" |
| 55 | #include "llvm/Support/Casting.h" |
| 56 | #include "llvm/Support/ConvertUTF.h" |
| 57 | #include "llvm/Support/SaveAndRestore.h" |
| 58 | #include "llvm/Support/TypeSize.h" |
| 59 | #include <optional> |
| 60 | |
| 61 | using namespace clang; |
| 62 | using namespace sema; |
| 63 | |
| 64 | /// Determine whether the use of this declaration is valid, without |
| 65 | /// emitting diagnostics. |
| 66 | bool Sema::CanUseDecl(NamedDecl *D, bool TreatUnavailableAsInvalid) { |
| 67 | // See if this is an auto-typed variable whose initializer we are parsing. |
| 68 | if (ParsingInitForAutoVars.count(D)) |
| 69 | return false; |
| 70 | |
| 71 | // See if this is a deleted function. |
| 72 | if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { |
| 73 | if (FD->isDeleted()) |
| 74 | return false; |
| 75 | |
| 76 | // If the function has a deduced return type, and we can't deduce it, |
| 77 | // then we can't use it either. |
| 78 | if (getLangOpts().CPlusPlus14 && FD->getReturnType()->isUndeducedType() && |
| 79 | DeduceReturnType(FD, SourceLocation(), /*Diagnose*/ false)) |
| 80 | return false; |
| 81 | |
| 82 | // See if this is an aligned allocation/deallocation function that is |
| 83 | // unavailable. |
| 84 | if (TreatUnavailableAsInvalid && |
| 85 | isUnavailableAlignedAllocationFunction(*FD)) |
| 86 | return false; |
| 87 | } |
| 88 | |
| 89 | // See if this function is unavailable. |
| 90 | if (TreatUnavailableAsInvalid && D->getAvailability() == AR_Unavailable && |
| 91 | cast<Decl>(CurContext)->getAvailability() != AR_Unavailable) |
| 92 | return false; |
| 93 | |
| 94 | if (isa<UnresolvedUsingIfExistsDecl>(D)) |
| 95 | return false; |
| 96 | |
| 97 | return true; |
| 98 | } |
| 99 | |
| 100 | static void DiagnoseUnusedOfDecl(Sema &S, NamedDecl *D, SourceLocation Loc) { |
| 101 | // Warn if this is used but marked unused. |
| 102 | if (const auto *A = D->getAttr<UnusedAttr>()) { |
| 103 | // [[maybe_unused]] should not diagnose uses, but __attribute__((unused)) |
| 104 | // should diagnose them. |
| 105 | if (A->getSemanticSpelling() != UnusedAttr::CXX11_maybe_unused && |
| 106 | A->getSemanticSpelling() != UnusedAttr::C2x_maybe_unused) { |
| 107 | const Decl *DC = cast_or_null<Decl>(S.getCurObjCLexicalContext()); |
| 108 | if (DC && !DC->hasAttr<UnusedAttr>()) |
| 109 | S.Diag(Loc, diag::warn_used_but_marked_unused) << D; |
| 110 | } |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | /// Emit a note explaining that this function is deleted. |
| 115 | void Sema::NoteDeletedFunction(FunctionDecl *Decl) { |
| 116 | assert(Decl && Decl->isDeleted())(static_cast <bool> (Decl && Decl->isDeleted ()) ? void (0) : __assert_fail ("Decl && Decl->isDeleted()" , "clang/lib/Sema/SemaExpr.cpp", 116, __extension__ __PRETTY_FUNCTION__ )); |
| 117 | |
| 118 | if (Decl->isDefaulted()) { |
| 119 | // If the method was explicitly defaulted, point at that declaration. |
| 120 | if (!Decl->isImplicit()) |
| 121 | Diag(Decl->getLocation(), diag::note_implicitly_deleted); |
| 122 | |
| 123 | // Try to diagnose why this special member function was implicitly |
| 124 | // deleted. This might fail, if that reason no longer applies. |
| 125 | DiagnoseDeletedDefaultedFunction(Decl); |
| 126 | return; |
| 127 | } |
| 128 | |
| 129 | auto *Ctor = dyn_cast<CXXConstructorDecl>(Decl); |
| 130 | if (Ctor && Ctor->isInheritingConstructor()) |
| 131 | return NoteDeletedInheritingConstructor(Ctor); |
| 132 | |
| 133 | Diag(Decl->getLocation(), diag::note_availability_specified_here) |
| 134 | << Decl << 1; |
| 135 | } |
| 136 | |
| 137 | /// Determine whether a FunctionDecl was ever declared with an |
| 138 | /// explicit storage class. |
| 139 | static bool hasAnyExplicitStorageClass(const FunctionDecl *D) { |
| 140 | for (auto *I : D->redecls()) { |
| 141 | if (I->getStorageClass() != SC_None) |
| 142 | return true; |
| 143 | } |
| 144 | return false; |
| 145 | } |
| 146 | |
| 147 | /// Check whether we're in an extern inline function and referring to a |
| 148 | /// variable or function with internal linkage (C11 6.7.4p3). |
| 149 | /// |
| 150 | /// This is only a warning because we used to silently accept this code, but |
| 151 | /// in many cases it will not behave correctly. This is not enabled in C++ mode |
| 152 | /// because the restriction language is a bit weaker (C++11 [basic.def.odr]p6) |
| 153 | /// and so while there may still be user mistakes, most of the time we can't |
| 154 | /// prove that there are errors. |
| 155 | static void diagnoseUseOfInternalDeclInInlineFunction(Sema &S, |
| 156 | const NamedDecl *D, |
| 157 | SourceLocation Loc) { |
| 158 | // This is disabled under C++; there are too many ways for this to fire in |
| 159 | // contexts where the warning is a false positive, or where it is technically |
| 160 | // correct but benign. |
| 161 | if (S.getLangOpts().CPlusPlus) |
| 162 | return; |
| 163 | |
| 164 | // Check if this is an inlined function or method. |
| 165 | FunctionDecl *Current = S.getCurFunctionDecl(); |
| 166 | if (!Current) |
| 167 | return; |
| 168 | if (!Current->isInlined()) |
| 169 | return; |
| 170 | if (!Current->isExternallyVisible()) |
| 171 | return; |
| 172 | |
| 173 | // Check if the decl has internal linkage. |
| 174 | if (D->getFormalLinkage() != InternalLinkage) |
| 175 | return; |
| 176 | |
| 177 | // Downgrade from ExtWarn to Extension if |
| 178 | // (1) the supposedly external inline function is in the main file, |
| 179 | // and probably won't be included anywhere else. |
| 180 | // (2) the thing we're referencing is a pure function. |
| 181 | // (3) the thing we're referencing is another inline function. |
| 182 | // This last can give us false negatives, but it's better than warning on |
| 183 | // wrappers for simple C library functions. |
| 184 | const FunctionDecl *UsedFn = dyn_cast<FunctionDecl>(D); |
| 185 | bool DowngradeWarning = S.getSourceManager().isInMainFile(Loc); |
| 186 | if (!DowngradeWarning && UsedFn) |
| 187 | DowngradeWarning = UsedFn->isInlined() || UsedFn->hasAttr<ConstAttr>(); |
| 188 | |
| 189 | S.Diag(Loc, DowngradeWarning ? diag::ext_internal_in_extern_inline_quiet |
| 190 | : diag::ext_internal_in_extern_inline) |
| 191 | << /*IsVar=*/!UsedFn << D; |
| 192 | |
| 193 | S.MaybeSuggestAddingStaticToDecl(Current); |
| 194 | |
| 195 | S.Diag(D->getCanonicalDecl()->getLocation(), diag::note_entity_declared_at) |
| 196 | << D; |
| 197 | } |
| 198 | |
| 199 | void Sema::MaybeSuggestAddingStaticToDecl(const FunctionDecl *Cur) { |
| 200 | const FunctionDecl *First = Cur->getFirstDecl(); |
| 201 | |
| 202 | // Suggest "static" on the function, if possible. |
| 203 | if (!hasAnyExplicitStorageClass(First)) { |
| 204 | SourceLocation DeclBegin = First->getSourceRange().getBegin(); |
| 205 | Diag(DeclBegin, diag::note_convert_inline_to_static) |
| 206 | << Cur << FixItHint::CreateInsertion(DeclBegin, "static "); |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | /// Determine whether the use of this declaration is valid, and |
| 211 | /// emit any corresponding diagnostics. |
| 212 | /// |
| 213 | /// This routine diagnoses various problems with referencing |
| 214 | /// declarations that can occur when using a declaration. For example, |
| 215 | /// it might warn if a deprecated or unavailable declaration is being |
| 216 | /// used, or produce an error (and return true) if a C++0x deleted |
| 217 | /// function is being used. |
| 218 | /// |
| 219 | /// \returns true if there was an error (this declaration cannot be |
| 220 | /// referenced), false otherwise. |
| 221 | /// |
| 222 | bool Sema::DiagnoseUseOfDecl(NamedDecl *D, ArrayRef<SourceLocation> Locs, |
| 223 | const ObjCInterfaceDecl *UnknownObjCClass, |
| 224 | bool ObjCPropertyAccess, |
| 225 | bool AvoidPartialAvailabilityChecks, |
| 226 | ObjCInterfaceDecl *ClassReceiver, |
| 227 | bool SkipTrailingRequiresClause) { |
| 228 | SourceLocation Loc = Locs.front(); |
| 229 | if (getLangOpts().CPlusPlus && isa<FunctionDecl>(D)) { |
| 230 | // If there were any diagnostics suppressed by template argument deduction, |
| 231 | // emit them now. |
| 232 | auto Pos = SuppressedDiagnostics.find(D->getCanonicalDecl()); |
| 233 | if (Pos != SuppressedDiagnostics.end()) { |
| 234 | for (const PartialDiagnosticAt &Suppressed : Pos->second) |
| 235 | Diag(Suppressed.first, Suppressed.second); |
| 236 | |
| 237 | // Clear out the list of suppressed diagnostics, so that we don't emit |
| 238 | // them again for this specialization. However, we don't obsolete this |
| 239 | // entry from the table, because we want to avoid ever emitting these |
| 240 | // diagnostics again. |
| 241 | Pos->second.clear(); |
| 242 | } |
| 243 | |
| 244 | // C++ [basic.start.main]p3: |
| 245 | // The function 'main' shall not be used within a program. |
| 246 | if (cast<FunctionDecl>(D)->isMain()) |
| 247 | Diag(Loc, diag::ext_main_used); |
| 248 | |
| 249 | diagnoseUnavailableAlignedAllocation(*cast<FunctionDecl>(D), Loc); |
| 250 | } |
| 251 | |
| 252 | // See if this is an auto-typed variable whose initializer we are parsing. |
| 253 | if (ParsingInitForAutoVars.count(D)) { |
| 254 | if (isa<BindingDecl>(D)) { |
| 255 | Diag(Loc, diag::err_binding_cannot_appear_in_own_initializer) |
| 256 | << D->getDeclName(); |
| 257 | } else { |
| 258 | Diag(Loc, diag::err_auto_variable_cannot_appear_in_own_initializer) |
| 259 | << D->getDeclName() << cast<VarDecl>(D)->getType(); |
| 260 | } |
| 261 | return true; |
| 262 | } |
| 263 | |
| 264 | if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { |
| 265 | // See if this is a deleted function. |
| 266 | if (FD->isDeleted()) { |
| 267 | auto *Ctor = dyn_cast<CXXConstructorDecl>(FD); |
| 268 | if (Ctor && Ctor->isInheritingConstructor()) |
| 269 | Diag(Loc, diag::err_deleted_inherited_ctor_use) |
| 270 | << Ctor->getParent() |
| 271 | << Ctor->getInheritedConstructor().getConstructor()->getParent(); |
| 272 | else |
| 273 | Diag(Loc, diag::err_deleted_function_use); |
| 274 | NoteDeletedFunction(FD); |
| 275 | return true; |
| 276 | } |
| 277 | |
| 278 | // [expr.prim.id]p4 |
| 279 | // A program that refers explicitly or implicitly to a function with a |
| 280 | // trailing requires-clause whose constraint-expression is not satisfied, |
| 281 | // other than to declare it, is ill-formed. [...] |
| 282 | // |
| 283 | // See if this is a function with constraints that need to be satisfied. |
| 284 | // Check this before deducing the return type, as it might instantiate the |
| 285 | // definition. |
| 286 | if (!SkipTrailingRequiresClause && FD->getTrailingRequiresClause()) { |
| 287 | ConstraintSatisfaction Satisfaction; |
| 288 | if (CheckFunctionConstraints(FD, Satisfaction, Loc, |
| 289 | /*ForOverloadResolution*/ true)) |
| 290 | // A diagnostic will have already been generated (non-constant |
| 291 | // constraint expression, for example) |
| 292 | return true; |
| 293 | if (!Satisfaction.IsSatisfied) { |
| 294 | Diag(Loc, |
| 295 | diag::err_reference_to_function_with_unsatisfied_constraints) |
| 296 | << D; |
| 297 | DiagnoseUnsatisfiedConstraint(Satisfaction); |
| 298 | return true; |
| 299 | } |
| 300 | } |
| 301 | |
| 302 | // If the function has a deduced return type, and we can't deduce it, |
| 303 | // then we can't use it either. |
| 304 | if (getLangOpts().CPlusPlus14 && FD->getReturnType()->isUndeducedType() && |
| 305 | DeduceReturnType(FD, Loc)) |
| 306 | return true; |
| 307 | |
| 308 | if (getLangOpts().CUDA && !CheckCUDACall(Loc, FD)) |
| 309 | return true; |
| 310 | |
| 311 | if (getLangOpts().SYCLIsDevice && !checkSYCLDeviceFunction(Loc, FD)) |
| 312 | return true; |
| 313 | } |
| 314 | |
| 315 | if (auto *MD = dyn_cast<CXXMethodDecl>(D)) { |
| 316 | // Lambdas are only default-constructible or assignable in C++2a onwards. |
| 317 | if (MD->getParent()->isLambda() && |
| 318 | ((isa<CXXConstructorDecl>(MD) && |
| 319 | cast<CXXConstructorDecl>(MD)->isDefaultConstructor()) || |
| 320 | MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator())) { |
| 321 | Diag(Loc, diag::warn_cxx17_compat_lambda_def_ctor_assign) |
| 322 | << !isa<CXXConstructorDecl>(MD); |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | auto getReferencedObjCProp = [](const NamedDecl *D) -> |
| 327 | const ObjCPropertyDecl * { |
| 328 | if (const auto *MD = dyn_cast<ObjCMethodDecl>(D)) |
| 329 | return MD->findPropertyDecl(); |
| 330 | return nullptr; |
| 331 | }; |
| 332 | if (const ObjCPropertyDecl *ObjCPDecl = getReferencedObjCProp(D)) { |
| 333 | if (diagnoseArgIndependentDiagnoseIfAttrs(ObjCPDecl, Loc)) |
| 334 | return true; |
| 335 | } else if (diagnoseArgIndependentDiagnoseIfAttrs(D, Loc)) { |
| 336 | return true; |
| 337 | } |
| 338 | |
| 339 | // [OpenMP 4.0], 2.15 declare reduction Directive, Restrictions |
| 340 | // Only the variables omp_in and omp_out are allowed in the combiner. |
| 341 | // Only the variables omp_priv and omp_orig are allowed in the |
| 342 | // initializer-clause. |
| 343 | auto *DRD = dyn_cast<OMPDeclareReductionDecl>(CurContext); |
| 344 | if (LangOpts.OpenMP && DRD && !CurContext->containsDecl(D) && |
| 345 | isa<VarDecl>(D)) { |
| 346 | Diag(Loc, diag::err_omp_wrong_var_in_declare_reduction) |
| 347 | << getCurFunction()->HasOMPDeclareReductionCombiner; |
| 348 | Diag(D->getLocation(), diag::note_entity_declared_at) << D; |
| 349 | return true; |
| 350 | } |
| 351 | |
| 352 | // [OpenMP 5.0], 2.19.7.3. declare mapper Directive, Restrictions |
| 353 | // List-items in map clauses on this construct may only refer to the declared |
| 354 | // variable var and entities that could be referenced by a procedure defined |
| 355 | // at the same location. |
| 356 | // [OpenMP 5.2] Also allow iterator declared variables. |
| 357 | if (LangOpts.OpenMP && isa<VarDecl>(D) && |
| 358 | !isOpenMPDeclareMapperVarDeclAllowed(cast<VarDecl>(D))) { |
| 359 | Diag(Loc, diag::err_omp_declare_mapper_wrong_var) |
| 360 | << getOpenMPDeclareMapperVarName(); |
| 361 | Diag(D->getLocation(), diag::note_entity_declared_at) << D; |
| 362 | return true; |
| 363 | } |
| 364 | |
| 365 | if (const auto *EmptyD = dyn_cast<UnresolvedUsingIfExistsDecl>(D)) { |
| 366 | Diag(Loc, diag::err_use_of_empty_using_if_exists); |
| 367 | Diag(EmptyD->getLocation(), diag::note_empty_using_if_exists_here); |
| 368 | return true; |
| 369 | } |
| 370 | |
| 371 | DiagnoseAvailabilityOfDecl(D, Locs, UnknownObjCClass, ObjCPropertyAccess, |
| 372 | AvoidPartialAvailabilityChecks, ClassReceiver); |
| 373 | |
| 374 | DiagnoseUnusedOfDecl(*this, D, Loc); |
| 375 | |
| 376 | diagnoseUseOfInternalDeclInInlineFunction(*this, D, Loc); |
| 377 | |
| 378 | if (auto *VD = dyn_cast<ValueDecl>(D)) |
| 379 | checkTypeSupport(VD->getType(), Loc, VD); |
| 380 | |
| 381 | if (LangOpts.SYCLIsDevice || (LangOpts.OpenMP && LangOpts.OpenMPIsDevice)) { |
| 382 | if (!Context.getTargetInfo().isTLSSupported()) |
| 383 | if (const auto *VD = dyn_cast<VarDecl>(D)) |
| 384 | if (VD->getTLSKind() != VarDecl::TLS_None) |
| 385 | targetDiag(*Locs.begin(), diag::err_thread_unsupported); |
| 386 | } |
| 387 | |
| 388 | if (isa<ParmVarDecl>(D) && isa<RequiresExprBodyDecl>(D->getDeclContext()) && |
| 389 | !isUnevaluatedContext()) { |
| 390 | // C++ [expr.prim.req.nested] p3 |
| 391 | // A local parameter shall only appear as an unevaluated operand |
| 392 | // (Clause 8) within the constraint-expression. |
| 393 | Diag(Loc, diag::err_requires_expr_parameter_referenced_in_evaluated_context) |
| 394 | << D; |
| 395 | Diag(D->getLocation(), diag::note_entity_declared_at) << D; |
| 396 | return true; |
| 397 | } |
| 398 | |
| 399 | return false; |
| 400 | } |
| 401 | |
| 402 | /// DiagnoseSentinelCalls - This routine checks whether a call or |
| 403 | /// message-send is to a declaration with the sentinel attribute, and |
| 404 | /// if so, it checks that the requirements of the sentinel are |
| 405 | /// satisfied. |
| 406 | void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc, |
| 407 | ArrayRef<Expr *> Args) { |
| 408 | const SentinelAttr *attr = D->getAttr<SentinelAttr>(); |
| 409 | if (!attr) |
| 410 | return; |
| 411 | |
| 412 | // The number of formal parameters of the declaration. |
| 413 | unsigned numFormalParams; |
| 414 | |
| 415 | // The kind of declaration. This is also an index into a %select in |
| 416 | // the diagnostic. |
| 417 | enum CalleeType { CT_Function, CT_Method, CT_Block } calleeType; |
| 418 | |
| 419 | if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) { |
| 420 | numFormalParams = MD->param_size(); |
| 421 | calleeType = CT_Method; |
| 422 | } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { |
| 423 | numFormalParams = FD->param_size(); |
| 424 | calleeType = CT_Function; |
| 425 | } else if (isa<VarDecl>(D)) { |
| 426 | QualType type = cast<ValueDecl>(D)->getType(); |
| 427 | const FunctionType *fn = nullptr; |
| 428 | if (const PointerType *ptr = type->getAs<PointerType>()) { |
| 429 | fn = ptr->getPointeeType()->getAs<FunctionType>(); |
| 430 | if (!fn) return; |
| 431 | calleeType = CT_Function; |
| 432 | } else if (const BlockPointerType *ptr = type->getAs<BlockPointerType>()) { |
| 433 | fn = ptr->getPointeeType()->castAs<FunctionType>(); |
| 434 | calleeType = CT_Block; |
| 435 | } else { |
| 436 | return; |
| 437 | } |
| 438 | |
| 439 | if (const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(fn)) { |
| 440 | numFormalParams = proto->getNumParams(); |
| 441 | } else { |
| 442 | numFormalParams = 0; |
| 443 | } |
| 444 | } else { |
| 445 | return; |
| 446 | } |
| 447 | |
| 448 | // "nullPos" is the number of formal parameters at the end which |
| 449 | // effectively count as part of the variadic arguments. This is |
| 450 | // useful if you would prefer to not have *any* formal parameters, |
| 451 | // but the language forces you to have at least one. |
| 452 | unsigned nullPos = attr->getNullPos(); |
| 453 | assert((nullPos == 0 || nullPos == 1) && "invalid null position on sentinel")(static_cast <bool> ((nullPos == 0 || nullPos == 1) && "invalid null position on sentinel") ? void (0) : __assert_fail ("(nullPos == 0 || nullPos == 1) && \"invalid null position on sentinel\"" , "clang/lib/Sema/SemaExpr.cpp", 453, __extension__ __PRETTY_FUNCTION__ )); |
| 454 | numFormalParams = (nullPos > numFormalParams ? 0 : numFormalParams - nullPos); |
| 455 | |
| 456 | // The number of arguments which should follow the sentinel. |
| 457 | unsigned numArgsAfterSentinel = attr->getSentinel(); |
| 458 | |
| 459 | // If there aren't enough arguments for all the formal parameters, |
| 460 | // the sentinel, and the args after the sentinel, complain. |
| 461 | if (Args.size() < numFormalParams + numArgsAfterSentinel + 1) { |
| 462 | Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName(); |
| 463 | Diag(D->getLocation(), diag::note_sentinel_here) << int(calleeType); |
| 464 | return; |
| 465 | } |
| 466 | |
| 467 | // Otherwise, find the sentinel expression. |
| 468 | Expr *sentinelExpr = Args[Args.size() - numArgsAfterSentinel - 1]; |
| 469 | if (!sentinelExpr) return; |
| 470 | if (sentinelExpr->isValueDependent()) return; |
| 471 | if (Context.isSentinelNullExpr(sentinelExpr)) return; |
| 472 | |
| 473 | // Pick a reasonable string to insert. Optimistically use 'nil', 'nullptr', |
| 474 | // or 'NULL' if those are actually defined in the context. Only use |
| 475 | // 'nil' for ObjC methods, where it's much more likely that the |
| 476 | // variadic arguments form a list of object pointers. |
| 477 | SourceLocation MissingNilLoc = getLocForEndOfToken(sentinelExpr->getEndLoc()); |
| 478 | std::string NullValue; |
| 479 | if (calleeType == CT_Method && PP.isMacroDefined("nil")) |
| 480 | NullValue = "nil"; |
| 481 | else if (getLangOpts().CPlusPlus11) |
| 482 | NullValue = "nullptr"; |
| 483 | else if (PP.isMacroDefined("NULL")) |
| 484 | NullValue = "NULL"; |
| 485 | else |
| 486 | NullValue = "(void*) 0"; |
| 487 | |
| 488 | if (MissingNilLoc.isInvalid()) |
| 489 | Diag(Loc, diag::warn_missing_sentinel) << int(calleeType); |
| 490 | else |
| 491 | Diag(MissingNilLoc, diag::warn_missing_sentinel) |
| 492 | << int(calleeType) |
| 493 | << FixItHint::CreateInsertion(MissingNilLoc, ", " + NullValue); |
| 494 | Diag(D->getLocation(), diag::note_sentinel_here) << int(calleeType); |
| 495 | } |
| 496 | |
| 497 | SourceRange Sema::getExprRange(Expr *E) const { |
| 498 | return E ? E->getSourceRange() : SourceRange(); |
| 499 | } |
| 500 | |
| 501 | //===----------------------------------------------------------------------===// |
| 502 | // Standard Promotions and Conversions |
| 503 | //===----------------------------------------------------------------------===// |
| 504 | |
| 505 | /// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). |
| 506 | ExprResult Sema::DefaultFunctionArrayConversion(Expr *E, bool Diagnose) { |
| 507 | // Handle any placeholder expressions which made it here. |
| 508 | if (E->hasPlaceholderType()) { |
| 509 | ExprResult result = CheckPlaceholderExpr(E); |
| 510 | if (result.isInvalid()) return ExprError(); |
| 511 | E = result.get(); |
| 512 | } |
| 513 | |
| 514 | QualType Ty = E->getType(); |
| 515 | assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type")(static_cast <bool> (!Ty.isNull() && "DefaultFunctionArrayConversion - missing type" ) ? void (0) : __assert_fail ("!Ty.isNull() && \"DefaultFunctionArrayConversion - missing type\"" , "clang/lib/Sema/SemaExpr.cpp", 515, __extension__ __PRETTY_FUNCTION__ )); |
| 516 | |
| 517 | if (Ty->isFunctionType()) { |
| 518 | if (auto *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts())) |
| 519 | if (auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl())) |
| 520 | if (!checkAddressOfFunctionIsAvailable(FD, Diagnose, E->getExprLoc())) |
| 521 | return ExprError(); |
| 522 | |
| 523 | E = ImpCastExprToType(E, Context.getPointerType(Ty), |
| 524 | CK_FunctionToPointerDecay).get(); |
| 525 | } else if (Ty->isArrayType()) { |
| 526 | // In C90 mode, arrays only promote to pointers if the array expression is |
| 527 | // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has |
| 528 | // type 'array of type' is converted to an expression that has type 'pointer |
| 529 | // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression |
| 530 | // that has type 'array of type' ...". The relevant change is "an lvalue" |
| 531 | // (C90) to "an expression" (C99). |
| 532 | // |
| 533 | // C++ 4.2p1: |
| 534 | // An lvalue or rvalue of type "array of N T" or "array of unknown bound of |
| 535 | // T" can be converted to an rvalue of type "pointer to T". |
| 536 | // |
| 537 | if (getLangOpts().C99 || getLangOpts().CPlusPlus || E->isLValue()) { |
| 538 | ExprResult Res = ImpCastExprToType(E, Context.getArrayDecayedType(Ty), |
| 539 | CK_ArrayToPointerDecay); |
| 540 | if (Res.isInvalid()) |
| 541 | return ExprError(); |
| 542 | E = Res.get(); |
| 543 | } |
| 544 | } |
| 545 | return E; |
| 546 | } |
| 547 | |
| 548 | static void CheckForNullPointerDereference(Sema &S, Expr *E) { |
| 549 | // Check to see if we are dereferencing a null pointer. If so, |
| 550 | // and if not volatile-qualified, this is undefined behavior that the |
| 551 | // optimizer will delete, so warn about it. People sometimes try to use this |
| 552 | // to get a deterministic trap and are surprised by clang's behavior. This |
| 553 | // only handles the pattern "*null", which is a very syntactic check. |
| 554 | const auto *UO = dyn_cast<UnaryOperator>(E->IgnoreParenCasts()); |
| 555 | if (UO && UO->getOpcode() == UO_Deref && |
| 556 | UO->getSubExpr()->getType()->isPointerType()) { |
| 557 | const LangAS AS = |
| 558 | UO->getSubExpr()->getType()->getPointeeType().getAddressSpace(); |
| 559 | if ((!isTargetAddressSpace(AS) || |
| 560 | (isTargetAddressSpace(AS) && toTargetAddressSpace(AS) == 0)) && |
| 561 | UO->getSubExpr()->IgnoreParenCasts()->isNullPointerConstant( |
| 562 | S.Context, Expr::NPC_ValueDependentIsNotNull) && |
| 563 | !UO->getType().isVolatileQualified()) { |
| 564 | S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO, |
| 565 | S.PDiag(diag::warn_indirection_through_null) |
| 566 | << UO->getSubExpr()->getSourceRange()); |
| 567 | S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO, |
| 568 | S.PDiag(diag::note_indirection_through_null)); |
| 569 | } |
| 570 | } |
| 571 | } |
| 572 | |
| 573 | static void DiagnoseDirectIsaAccess(Sema &S, const ObjCIvarRefExpr *OIRE, |
| 574 | SourceLocation AssignLoc, |
| 575 | const Expr* RHS) { |
| 576 | const ObjCIvarDecl *IV = OIRE->getDecl(); |
| 577 | if (!IV) |
| 578 | return; |
| 579 | |
| 580 | DeclarationName MemberName = IV->getDeclName(); |
| 581 | IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); |
| 582 | if (!Member || !Member->isStr("isa")) |
| 583 | return; |
| 584 | |
| 585 | const Expr *Base = OIRE->getBase(); |
| 586 | QualType BaseType = Base->getType(); |
| 587 | if (OIRE->isArrow()) |
| 588 | BaseType = BaseType->getPointeeType(); |
| 589 | if (const ObjCObjectType *OTy = BaseType->getAs<ObjCObjectType>()) |
| 590 | if (ObjCInterfaceDecl *IDecl = OTy->getInterface()) { |
| 591 | ObjCInterfaceDecl *ClassDeclared = nullptr; |
| 592 | ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared); |
| 593 | if (!ClassDeclared->getSuperClass() |
| 594 | && (*ClassDeclared->ivar_begin()) == IV) { |
| 595 | if (RHS) { |
| 596 | NamedDecl *ObjectSetClass = |
| 597 | S.LookupSingleName(S.TUScope, |
| 598 | &S.Context.Idents.get("object_setClass"), |
| 599 | SourceLocation(), S.LookupOrdinaryName); |
| 600 | if (ObjectSetClass) { |
| 601 | SourceLocation RHSLocEnd = S.getLocForEndOfToken(RHS->getEndLoc()); |
| 602 | S.Diag(OIRE->getExprLoc(), diag::warn_objc_isa_assign) |
| 603 | << FixItHint::CreateInsertion(OIRE->getBeginLoc(), |
| 604 | "object_setClass(") |
| 605 | << FixItHint::CreateReplacement( |
| 606 | SourceRange(OIRE->getOpLoc(), AssignLoc), ",") |
| 607 | << FixItHint::CreateInsertion(RHSLocEnd, ")"); |
| 608 | } |
| 609 | else |
| 610 | S.Diag(OIRE->getLocation(), diag::warn_objc_isa_assign); |
| 611 | } else { |
| 612 | NamedDecl *ObjectGetClass = |
| 613 | S.LookupSingleName(S.TUScope, |
| 614 | &S.Context.Idents.get("object_getClass"), |
| 615 | SourceLocation(), S.LookupOrdinaryName); |
| 616 | if (ObjectGetClass) |
| 617 | S.Diag(OIRE->getExprLoc(), diag::warn_objc_isa_use) |
| 618 | << FixItHint::CreateInsertion(OIRE->getBeginLoc(), |
| 619 | "object_getClass(") |
| 620 | << FixItHint::CreateReplacement( |
| 621 | SourceRange(OIRE->getOpLoc(), OIRE->getEndLoc()), ")"); |
| 622 | else |
| 623 | S.Diag(OIRE->getLocation(), diag::warn_objc_isa_use); |
| 624 | } |
| 625 | S.Diag(IV->getLocation(), diag::note_ivar_decl); |
| 626 | } |
| 627 | } |
| 628 | } |
| 629 | |
| 630 | ExprResult Sema::DefaultLvalueConversion(Expr *E) { |
| 631 | // Handle any placeholder expressions which made it here. |
| 632 | if (E->hasPlaceholderType()) { |
| 633 | ExprResult result = CheckPlaceholderExpr(E); |
| 634 | if (result.isInvalid()) return ExprError(); |
| 635 | E = result.get(); |
| 636 | } |
| 637 | |
| 638 | // C++ [conv.lval]p1: |
| 639 | // A glvalue of a non-function, non-array type T can be |
| 640 | // converted to a prvalue. |
| 641 | if (!E->isGLValue()) return E; |
| 642 | |
| 643 | QualType T = E->getType(); |
| 644 | assert(!T.isNull() && "r-value conversion on typeless expression?")(static_cast <bool> (!T.isNull() && "r-value conversion on typeless expression?" ) ? void (0) : __assert_fail ("!T.isNull() && \"r-value conversion on typeless expression?\"" , "clang/lib/Sema/SemaExpr.cpp", 644, __extension__ __PRETTY_FUNCTION__ )); |
| 645 | |
| 646 | // lvalue-to-rvalue conversion cannot be applied to function or array types. |
| 647 | if (T->isFunctionType() || T->isArrayType()) |
| 648 | return E; |
| 649 | |
| 650 | // We don't want to throw lvalue-to-rvalue casts on top of |
| 651 | // expressions of certain types in C++. |
| 652 | if (getLangOpts().CPlusPlus && |
| 653 | (E->getType() == Context.OverloadTy || |
| 654 | T->isDependentType() || |
| 655 | T->isRecordType())) |
| 656 | return E; |
| 657 | |
| 658 | // The C standard is actually really unclear on this point, and |
| 659 | // DR106 tells us what the result should be but not why. It's |
| 660 | // generally best to say that void types just doesn't undergo |
| 661 | // lvalue-to-rvalue at all. Note that expressions of unqualified |
| 662 | // 'void' type are never l-values, but qualified void can be. |
| 663 | if (T->isVoidType()) |
| 664 | return E; |
| 665 | |
| 666 | // OpenCL usually rejects direct accesses to values of 'half' type. |
| 667 | if (getLangOpts().OpenCL && |
| 668 | !getOpenCLOptions().isAvailableOption("cl_khr_fp16", getLangOpts()) && |
| 669 | T->isHalfType()) { |
| 670 | Diag(E->getExprLoc(), diag::err_opencl_half_load_store) |
| 671 | << 0 << T; |
| 672 | return ExprError(); |
| 673 | } |
| 674 | |
| 675 | CheckForNullPointerDereference(*this, E); |
| 676 | if (const ObjCIsaExpr *OISA = dyn_cast<ObjCIsaExpr>(E->IgnoreParenCasts())) { |
| 677 | NamedDecl *ObjectGetClass = LookupSingleName(TUScope, |
| 678 | &Context.Idents.get("object_getClass"), |
| 679 | SourceLocation(), LookupOrdinaryName); |
| 680 | if (ObjectGetClass) |
| 681 | Diag(E->getExprLoc(), diag::warn_objc_isa_use) |
| 682 | << FixItHint::CreateInsertion(OISA->getBeginLoc(), "object_getClass(") |
| 683 | << FixItHint::CreateReplacement( |
| 684 | SourceRange(OISA->getOpLoc(), OISA->getIsaMemberLoc()), ")"); |
| 685 | else |
| 686 | Diag(E->getExprLoc(), diag::warn_objc_isa_use); |
| 687 | } |
| 688 | else if (const ObjCIvarRefExpr *OIRE = |
| 689 | dyn_cast<ObjCIvarRefExpr>(E->IgnoreParenCasts())) |
| 690 | DiagnoseDirectIsaAccess(*this, OIRE, SourceLocation(), /* Expr*/nullptr); |
| 691 | |
| 692 | // C++ [conv.lval]p1: |
| 693 | // [...] If T is a non-class type, the type of the prvalue is the |
| 694 | // cv-unqualified version of T. Otherwise, the type of the |
| 695 | // rvalue is T. |
| 696 | // |
| 697 | // C99 6.3.2.1p2: |
| 698 | // If the lvalue has qualified type, the value has the unqualified |
| 699 | // version of the type of the lvalue; otherwise, the value has the |
| 700 | // type of the lvalue. |
| 701 | if (T.hasQualifiers()) |
| 702 | T = T.getUnqualifiedType(); |
| 703 | |
| 704 | // Under the MS ABI, lock down the inheritance model now. |
| 705 | if (T->isMemberPointerType() && |
| 706 | Context.getTargetInfo().getCXXABI().isMicrosoft()) |
| 707 | (void)isCompleteType(E->getExprLoc(), T); |
| 708 | |
| 709 | ExprResult Res = CheckLValueToRValueConversionOperand(E); |
| 710 | if (Res.isInvalid()) |
| 711 | return Res; |
| 712 | E = Res.get(); |
| 713 | |
| 714 | // Loading a __weak object implicitly retains the value, so we need a cleanup to |
| 715 | // balance that. |
| 716 | if (E->getType().getObjCLifetime() == Qualifiers::OCL_Weak) |
| 717 | Cleanup.setExprNeedsCleanups(true); |
| 718 | |
| 719 | if (E->getType().isDestructedType() == QualType::DK_nontrivial_c_struct) |
| 720 | Cleanup.setExprNeedsCleanups(true); |
| 721 | |
| 722 | // C++ [conv.lval]p3: |
| 723 | // If T is cv std::nullptr_t, the result is a null pointer constant. |
| 724 | CastKind CK = T->isNullPtrType() ? CK_NullToPointer : CK_LValueToRValue; |
| 725 | Res = ImplicitCastExpr::Create(Context, T, CK, E, nullptr, VK_PRValue, |
| 726 | CurFPFeatureOverrides()); |
| 727 | |
| 728 | // C11 6.3.2.1p2: |
| 729 | // ... if the lvalue has atomic type, the value has the non-atomic version |
| 730 | // of the type of the lvalue ... |
| 731 | if (const AtomicType *Atomic = T->getAs<AtomicType>()) { |
| 732 | T = Atomic->getValueType().getUnqualifiedType(); |
| 733 | Res = ImplicitCastExpr::Create(Context, T, CK_AtomicToNonAtomic, Res.get(), |
| 734 | nullptr, VK_PRValue, FPOptionsOverride()); |
| 735 | } |
| 736 | |
| 737 | return Res; |
| 738 | } |
| 739 | |
| 740 | ExprResult Sema::DefaultFunctionArrayLvalueConversion(Expr *E, bool Diagnose) { |
| 741 | ExprResult Res = DefaultFunctionArrayConversion(E, Diagnose); |
| 742 | if (Res.isInvalid()) |
| 743 | return ExprError(); |
| 744 | Res = DefaultLvalueConversion(Res.get()); |
| 745 | if (Res.isInvalid()) |
| 746 | return ExprError(); |
| 747 | return Res; |
| 748 | } |
| 749 | |
| 750 | /// CallExprUnaryConversions - a special case of an unary conversion |
| 751 | /// performed on a function designator of a call expression. |
| 752 | ExprResult Sema::CallExprUnaryConversions(Expr *E) { |
| 753 | QualType Ty = E->getType(); |
| 754 | ExprResult Res = E; |
| 755 | // Only do implicit cast for a function type, but not for a pointer |
| 756 | // to function type. |
| 757 | if (Ty->isFunctionType()) { |
| 758 | Res = ImpCastExprToType(E, Context.getPointerType(Ty), |
| 759 | CK_FunctionToPointerDecay); |
| 760 | if (Res.isInvalid()) |
| 761 | return ExprError(); |
| 762 | } |
| 763 | Res = DefaultLvalueConversion(Res.get()); |
| 764 | if (Res.isInvalid()) |
| 765 | return ExprError(); |
| 766 | return Res.get(); |
| 767 | } |
| 768 | |
| 769 | /// UsualUnaryConversions - Performs various conversions that are common to most |
| 770 | /// operators (C99 6.3). The conversions of array and function types are |
| 771 | /// sometimes suppressed. For example, the array->pointer conversion doesn't |
| 772 | /// apply if the array is an argument to the sizeof or address (&) operators. |
| 773 | /// In these instances, this routine should *not* be called. |
| 774 | ExprResult Sema::UsualUnaryConversions(Expr *E) { |
| 775 | // First, convert to an r-value. |
| 776 | ExprResult Res = DefaultFunctionArrayLvalueConversion(E); |
| 777 | if (Res.isInvalid()) |
| 778 | return ExprError(); |
| 779 | E = Res.get(); |
| 780 | |
| 781 | QualType Ty = E->getType(); |
| 782 | assert(!Ty.isNull() && "UsualUnaryConversions - missing type")(static_cast <bool> (!Ty.isNull() && "UsualUnaryConversions - missing type" ) ? void (0) : __assert_fail ("!Ty.isNull() && \"UsualUnaryConversions - missing type\"" , "clang/lib/Sema/SemaExpr.cpp", 782, __extension__ __PRETTY_FUNCTION__ )); |
| 783 | |
| 784 | LangOptions::FPEvalMethodKind EvalMethod = CurFPFeatures.getFPEvalMethod(); |
| 785 | if (EvalMethod != LangOptions::FEM_Source && Ty->isFloatingType() && |
| 786 | (getLangOpts().getFPEvalMethod() != |
| 787 | LangOptions::FPEvalMethodKind::FEM_UnsetOnCommandLine || |
| 788 | PP.getLastFPEvalPragmaLocation().isValid())) { |
| 789 | switch (EvalMethod) { |
| 790 | default: |
| 791 | llvm_unreachable("Unrecognized float evaluation method")::llvm::llvm_unreachable_internal("Unrecognized float evaluation method" , "clang/lib/Sema/SemaExpr.cpp", 791); |
| 792 | break; |
| 793 | case LangOptions::FEM_UnsetOnCommandLine: |
| 794 | llvm_unreachable("Float evaluation method should be set by now")::llvm::llvm_unreachable_internal("Float evaluation method should be set by now" , "clang/lib/Sema/SemaExpr.cpp", 794); |
| 795 | break; |
| 796 | case LangOptions::FEM_Double: |
| 797 | if (Context.getFloatingTypeOrder(Context.DoubleTy, Ty) > 0) |
| 798 | // Widen the expression to double. |
| 799 | return Ty->isComplexType() |
| 800 | ? ImpCastExprToType(E, |
| 801 | Context.getComplexType(Context.DoubleTy), |
| 802 | CK_FloatingComplexCast) |
| 803 | : ImpCastExprToType(E, Context.DoubleTy, CK_FloatingCast); |
| 804 | break; |
| 805 | case LangOptions::FEM_Extended: |
| 806 | if (Context.getFloatingTypeOrder(Context.LongDoubleTy, Ty) > 0) |
| 807 | // Widen the expression to long double. |
| 808 | return Ty->isComplexType() |
| 809 | ? ImpCastExprToType( |
| 810 | E, Context.getComplexType(Context.LongDoubleTy), |
| 811 | CK_FloatingComplexCast) |
| 812 | : ImpCastExprToType(E, Context.LongDoubleTy, |
| 813 | CK_FloatingCast); |
| 814 | break; |
| 815 | } |
| 816 | } |
| 817 | |
| 818 | // Half FP have to be promoted to float unless it is natively supported |
| 819 | if (Ty->isHalfType() && !getLangOpts().NativeHalfType) |
| 820 | return ImpCastExprToType(Res.get(), Context.FloatTy, CK_FloatingCast); |
| 821 | |
| 822 | // Try to perform integral promotions if the object has a theoretically |
| 823 | // promotable type. |
| 824 | if (Ty->isIntegralOrUnscopedEnumerationType()) { |
| 825 | // C99 6.3.1.1p2: |
| 826 | // |
| 827 | // The following may be used in an expression wherever an int or |
| 828 | // unsigned int may be used: |
| 829 | // - an object or expression with an integer type whose integer |
| 830 | // conversion rank is less than or equal to the rank of int |
| 831 | // and unsigned int. |
| 832 | // - A bit-field of type _Bool, int, signed int, or unsigned int. |
| 833 | // |
| 834 | // If an int can represent all values of the original type, the |
| 835 | // value is converted to an int; otherwise, it is converted to an |
| 836 | // unsigned int. These are called the integer promotions. All |
| 837 | // other types are unchanged by the integer promotions. |
| 838 | |
| 839 | QualType PTy = Context.isPromotableBitField(E); |
| 840 | if (!PTy.isNull()) { |
| 841 | E = ImpCastExprToType(E, PTy, CK_IntegralCast).get(); |
| 842 | return E; |
| 843 | } |
| 844 | if (Context.isPromotableIntegerType(Ty)) { |
| 845 | QualType PT = Context.getPromotedIntegerType(Ty); |
| 846 | E = ImpCastExprToType(E, PT, CK_IntegralCast).get(); |
| 847 | return E; |
| 848 | } |
| 849 | } |
| 850 | return E; |
| 851 | } |
| 852 | |
| 853 | /// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that |
| 854 | /// do not have a prototype. Arguments that have type float or __fp16 |
| 855 | /// are promoted to double. All other argument types are converted by |
| 856 | /// UsualUnaryConversions(). |
| 857 | ExprResult Sema::DefaultArgumentPromotion(Expr *E) { |
| 858 | QualType Ty = E->getType(); |
| 859 | assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type")(static_cast <bool> (!Ty.isNull() && "DefaultArgumentPromotion - missing type" ) ? void (0) : __assert_fail ("!Ty.isNull() && \"DefaultArgumentPromotion - missing type\"" , "clang/lib/Sema/SemaExpr.cpp", 859, __extension__ __PRETTY_FUNCTION__ )); |
| 860 | |
| 861 | ExprResult Res = UsualUnaryConversions(E); |
| 862 | if (Res.isInvalid()) |
| 863 | return ExprError(); |
| 864 | E = Res.get(); |
| 865 | |
| 866 | // If this is a 'float' or '__fp16' (CVR qualified or typedef) |
| 867 | // promote to double. |
| 868 | // Note that default argument promotion applies only to float (and |
| 869 | // half/fp16); it does not apply to _Float16. |
| 870 | const BuiltinType *BTy = Ty->getAs<BuiltinType>(); |
| 871 | if (BTy && (BTy->getKind() == BuiltinType::Half || |
| 872 | BTy->getKind() == BuiltinType::Float)) { |
| 873 | if (getLangOpts().OpenCL && |
| 874 | !getOpenCLOptions().isAvailableOption("cl_khr_fp64", getLangOpts())) { |
| 875 | if (BTy->getKind() == BuiltinType::Half) { |
| 876 | E = ImpCastExprToType(E, Context.FloatTy, CK_FloatingCast).get(); |
| 877 | } |
| 878 | } else { |
| 879 | E = ImpCastExprToType(E, Context.DoubleTy, CK_FloatingCast).get(); |
| 880 | } |
| 881 | } |
| 882 | if (BTy && |
| 883 | getLangOpts().getExtendIntArgs() == |
| 884 | LangOptions::ExtendArgsKind::ExtendTo64 && |
| 885 | Context.getTargetInfo().supportsExtendIntArgs() && Ty->isIntegerType() && |
| 886 | Context.getTypeSizeInChars(BTy) < |
| 887 | Context.getTypeSizeInChars(Context.LongLongTy)) { |
| 888 | E = (Ty->isUnsignedIntegerType()) |
| 889 | ? ImpCastExprToType(E, Context.UnsignedLongLongTy, CK_IntegralCast) |
| 890 | .get() |
| 891 | : ImpCastExprToType(E, Context.LongLongTy, CK_IntegralCast).get(); |
| 892 | assert(8 == Context.getTypeSizeInChars(Context.LongLongTy).getQuantity() &&(static_cast <bool> (8 == Context.getTypeSizeInChars(Context .LongLongTy).getQuantity() && "Unexpected typesize for LongLongTy" ) ? void (0) : __assert_fail ("8 == Context.getTypeSizeInChars(Context.LongLongTy).getQuantity() && \"Unexpected typesize for LongLongTy\"" , "clang/lib/Sema/SemaExpr.cpp", 893, __extension__ __PRETTY_FUNCTION__ )) |
| 893 | "Unexpected typesize for LongLongTy")(static_cast <bool> (8 == Context.getTypeSizeInChars(Context .LongLongTy).getQuantity() && "Unexpected typesize for LongLongTy" ) ? void (0) : __assert_fail ("8 == Context.getTypeSizeInChars(Context.LongLongTy).getQuantity() && \"Unexpected typesize for LongLongTy\"" , "clang/lib/Sema/SemaExpr.cpp", 893, __extension__ __PRETTY_FUNCTION__ )); |
| 894 | } |
| 895 | |
| 896 | // C++ performs lvalue-to-rvalue conversion as a default argument |
| 897 | // promotion, even on class types, but note: |
| 898 | // C++11 [conv.lval]p2: |
| 899 | // When an lvalue-to-rvalue conversion occurs in an unevaluated |
| 900 | // operand or a subexpression thereof the value contained in the |
| 901 | // referenced object is not accessed. Otherwise, if the glvalue |
| 902 | // has a class type, the conversion copy-initializes a temporary |
| 903 | // of type T from the glvalue and the result of the conversion |
| 904 | // is a prvalue for the temporary. |
| 905 | // FIXME: add some way to gate this entire thing for correctness in |
| 906 | // potentially potentially evaluated contexts. |
| 907 | if (getLangOpts().CPlusPlus && E->isGLValue() && !isUnevaluatedContext()) { |
| 908 | ExprResult Temp = PerformCopyInitialization( |
| 909 | InitializedEntity::InitializeTemporary(E->getType()), |
| 910 | E->getExprLoc(), E); |
| 911 | if (Temp.isInvalid()) |
| 912 | return ExprError(); |
| 913 | E = Temp.get(); |
| 914 | } |
| 915 | |
| 916 | return E; |
| 917 | } |
| 918 | |
| 919 | /// Determine the degree of POD-ness for an expression. |
| 920 | /// Incomplete types are considered POD, since this check can be performed |
| 921 | /// when we're in an unevaluated context. |
| 922 | Sema::VarArgKind Sema::isValidVarArgType(const QualType &Ty) { |
| 923 | if (Ty->isIncompleteType()) { |
| 924 | // C++11 [expr.call]p7: |
| 925 | // After these conversions, if the argument does not have arithmetic, |
| 926 | // enumeration, pointer, pointer to member, or class type, the program |
| 927 | // is ill-formed. |
| 928 | // |
| 929 | // Since we've already performed array-to-pointer and function-to-pointer |
| 930 | // decay, the only such type in C++ is cv void. This also handles |
| 931 | // initializer lists as variadic arguments. |
| 932 | if (Ty->isVoidType()) |
| 933 | return VAK_Invalid; |
| 934 | |
| 935 | if (Ty->isObjCObjectType()) |
| 936 | return VAK_Invalid; |
| 937 | return VAK_Valid; |
| 938 | } |
| 939 | |
| 940 | if (Ty.isDestructedType() == QualType::DK_nontrivial_c_struct) |
| 941 | return VAK_Invalid; |
| 942 | |
| 943 | if (Context.getTargetInfo().getTriple().isWasm() && |
| 944 | Ty->isWebAssemblyReferenceType()) { |
| 945 | return VAK_Invalid; |
| 946 | } |
| 947 | |
| 948 | if (Ty.isCXX98PODType(Context)) |
| 949 | return VAK_Valid; |
| 950 | |
| 951 | // C++11 [expr.call]p7: |
| 952 | // Passing a potentially-evaluated argument of class type (Clause 9) |
| 953 | // having a non-trivial copy constructor, a non-trivial move constructor, |
| 954 | // or a non-trivial destructor, with no corresponding parameter, |
| 955 | // is conditionally-supported with implementation-defined semantics. |
| 956 | if (getLangOpts().CPlusPlus11 && !Ty->isDependentType()) |
| 957 | if (CXXRecordDecl *Record = Ty->getAsCXXRecordDecl()) |
| 958 | if (!Record->hasNonTrivialCopyConstructor() && |
| 959 | !Record->hasNonTrivialMoveConstructor() && |
| 960 | !Record->hasNonTrivialDestructor()) |
| 961 | return VAK_ValidInCXX11; |
| 962 | |
| 963 | if (getLangOpts().ObjCAutoRefCount && Ty->isObjCLifetimeType()) |
| 964 | return VAK_Valid; |
| 965 | |
| 966 | if (Ty->isObjCObjectType()) |
| 967 | return VAK_Invalid; |
| 968 | |
| 969 | if (getLangOpts().MSVCCompat) |
| 970 | return VAK_MSVCUndefined; |
| 971 | |
| 972 | // FIXME: In C++11, these cases are conditionally-supported, meaning we're |
| 973 | // permitted to reject them. We should consider doing so. |
| 974 | return VAK_Undefined; |
| 975 | } |
| 976 | |
| 977 | void Sema::checkVariadicArgument(const Expr *E, VariadicCallType CT) { |
| 978 | // Don't allow one to pass an Objective-C interface to a vararg. |
| 979 | const QualType &Ty = E->getType(); |
| 980 | VarArgKind VAK = isValidVarArgType(Ty); |
| 981 | |
| 982 | // Complain about passing non-POD types through varargs. |
| 983 | switch (VAK) { |
| 984 | case VAK_ValidInCXX11: |
| 985 | DiagRuntimeBehavior( |
| 986 | E->getBeginLoc(), nullptr, |
| 987 | PDiag(diag::warn_cxx98_compat_pass_non_pod_arg_to_vararg) << Ty << CT); |
| 988 | [[fallthrough]]; |
| 989 | case VAK_Valid: |
| 990 | if (Ty->isRecordType()) { |
| 991 | // This is unlikely to be what the user intended. If the class has a |
| 992 | // 'c_str' member function, the user probably meant to call that. |
| 993 | DiagRuntimeBehavior(E->getBeginLoc(), nullptr, |
| 994 | PDiag(diag::warn_pass_class_arg_to_vararg) |
| 995 | << Ty << CT << hasCStrMethod(E) << ".c_str()"); |
| 996 | } |
| 997 | break; |
| 998 | |
| 999 | case VAK_Undefined: |
| 1000 | case VAK_MSVCUndefined: |
| 1001 | DiagRuntimeBehavior(E->getBeginLoc(), nullptr, |
| 1002 | PDiag(diag::warn_cannot_pass_non_pod_arg_to_vararg) |
| 1003 | << getLangOpts().CPlusPlus11 << Ty << CT); |
| 1004 | break; |
| 1005 | |
| 1006 | case VAK_Invalid: |
| 1007 | if (Ty.isDestructedType() == QualType::DK_nontrivial_c_struct) |
| 1008 | Diag(E->getBeginLoc(), |
| 1009 | diag::err_cannot_pass_non_trivial_c_struct_to_vararg) |
| 1010 | << Ty << CT; |
| 1011 | else if (Ty->isObjCObjectType()) |
| 1012 | DiagRuntimeBehavior(E->getBeginLoc(), nullptr, |
| 1013 | PDiag(diag::err_cannot_pass_objc_interface_to_vararg) |
| 1014 | << Ty << CT); |
| 1015 | else |
| 1016 | Diag(E->getBeginLoc(), diag::err_cannot_pass_to_vararg) |
| 1017 | << isa<InitListExpr>(E) << Ty << CT; |
| 1018 | break; |
| 1019 | } |
| 1020 | } |
| 1021 | |
| 1022 | /// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but |
| 1023 | /// will create a trap if the resulting type is not a POD type. |
| 1024 | ExprResult Sema::DefaultVariadicArgumentPromotion(Expr *E, VariadicCallType CT, |
| 1025 | FunctionDecl *FDecl) { |
| 1026 | if (const BuiltinType *PlaceholderTy = E->getType()->getAsPlaceholderType()) { |
| 1027 | // Strip the unbridged-cast placeholder expression off, if applicable. |
| 1028 | if (PlaceholderTy->getKind() == BuiltinType::ARCUnbridgedCast && |
| 1029 | (CT == VariadicMethod || |
| 1030 | (FDecl && FDecl->hasAttr<CFAuditedTransferAttr>()))) { |
| 1031 | E = stripARCUnbridgedCast(E); |
| 1032 | |
| 1033 | // Otherwise, do normal placeholder checking. |
| 1034 | } else { |
| 1035 | ExprResult ExprRes = CheckPlaceholderExpr(E); |
| 1036 | if (ExprRes.isInvalid()) |
| 1037 | return ExprError(); |
| 1038 | E = ExprRes.get(); |
| 1039 | } |
| 1040 | } |
| 1041 | |
| 1042 | ExprResult ExprRes = DefaultArgumentPromotion(E); |
| 1043 | if (ExprRes.isInvalid()) |
| 1044 | return ExprError(); |
| 1045 | |
| 1046 | // Copy blocks to the heap. |
| 1047 | if (ExprRes.get()->getType()->isBlockPointerType()) |
| 1048 | maybeExtendBlockObject(ExprRes); |
| 1049 | |
| 1050 | E = ExprRes.get(); |
| 1051 | |
| 1052 | // Diagnostics regarding non-POD argument types are |
| 1053 | // emitted along with format string checking in Sema::CheckFunctionCall(). |
| 1054 | if (isValidVarArgType(E->getType()) == VAK_Undefined) { |
| 1055 | // Turn this into a trap. |
| 1056 | CXXScopeSpec SS; |
| 1057 | SourceLocation TemplateKWLoc; |
| 1058 | UnqualifiedId Name; |
| 1059 | Name.setIdentifier(PP.getIdentifierInfo("__builtin_trap"), |
| 1060 | E->getBeginLoc()); |
| 1061 | ExprResult TrapFn = ActOnIdExpression(TUScope, SS, TemplateKWLoc, Name, |
| 1062 | /*HasTrailingLParen=*/true, |
| 1063 | /*IsAddressOfOperand=*/false); |
| 1064 | if (TrapFn.isInvalid()) |
| 1065 | return ExprError(); |
| 1066 | |
| 1067 | ExprResult Call = BuildCallExpr(TUScope, TrapFn.get(), E->getBeginLoc(), |
| 1068 | std::nullopt, E->getEndLoc()); |
| 1069 | if (Call.isInvalid()) |
| 1070 | return ExprError(); |
| 1071 | |
| 1072 | ExprResult Comma = |
| 1073 | ActOnBinOp(TUScope, E->getBeginLoc(), tok::comma, Call.get(), E); |
| 1074 | if (Comma.isInvalid()) |
| 1075 | return ExprError(); |
| 1076 | return Comma.get(); |
| 1077 | } |
| 1078 | |
| 1079 | if (!getLangOpts().CPlusPlus && |
| 1080 | RequireCompleteType(E->getExprLoc(), E->getType(), |
| 1081 | diag::err_call_incomplete_argument)) |
| 1082 | return ExprError(); |
| 1083 | |
| 1084 | return E; |
| 1085 | } |
| 1086 | |
| 1087 | /// Converts an integer to complex float type. Helper function of |
| 1088 | /// UsualArithmeticConversions() |
| 1089 | /// |
| 1090 | /// \return false if the integer expression is an integer type and is |
| 1091 | /// successfully converted to the complex type. |
| 1092 | static bool handleIntegerToComplexFloatConversion(Sema &S, ExprResult &IntExpr, |
| 1093 | ExprResult &ComplexExpr, |
| 1094 | QualType IntTy, |
| 1095 | QualType ComplexTy, |
| 1096 | bool SkipCast) { |
| 1097 | if (IntTy->isComplexType() || IntTy->isRealFloatingType()) return true; |
| 1098 | if (SkipCast) return false; |
| 1099 | if (IntTy->isIntegerType()) { |
| 1100 | QualType fpTy = ComplexTy->castAs<ComplexType>()->getElementType(); |
| 1101 | IntExpr = S.ImpCastExprToType(IntExpr.get(), fpTy, CK_IntegralToFloating); |
| 1102 | IntExpr = S.ImpCastExprToType(IntExpr.get(), ComplexTy, |
| 1103 | CK_FloatingRealToComplex); |
| 1104 | } else { |
| 1105 | assert(IntTy->isComplexIntegerType())(static_cast <bool> (IntTy->isComplexIntegerType()) ? void (0) : __assert_fail ("IntTy->isComplexIntegerType()" , "clang/lib/Sema/SemaExpr.cpp", 1105, __extension__ __PRETTY_FUNCTION__ )); |
| 1106 | IntExpr = S.ImpCastExprToType(IntExpr.get(), ComplexTy, |
| 1107 | CK_IntegralComplexToFloatingComplex); |
| 1108 | } |
| 1109 | return false; |
| 1110 | } |
| 1111 | |
| 1112 | // This handles complex/complex, complex/float, or float/complex. |
| 1113 | // When both operands are complex, the shorter operand is converted to the |
| 1114 | // type of the longer, and that is the type of the result. This corresponds |
| 1115 | // to what is done when combining two real floating-point operands. |
| 1116 | // The fun begins when size promotion occur across type domains. |
| 1117 | // From H&S 6.3.4: When one operand is complex and the other is a real |
| 1118 | // floating-point type, the less precise type is converted, within it's |
| 1119 | // real or complex domain, to the precision of the other type. For example, |
| 1120 | // when combining a "long double" with a "double _Complex", the |
| 1121 | // "double _Complex" is promoted to "long double _Complex". |
| 1122 | static QualType handleComplexFloatConversion(Sema &S, ExprResult &Shorter, |
| 1123 | QualType ShorterType, |
| 1124 | QualType LongerType, |
| 1125 | bool PromotePrecision) { |
| 1126 | bool LongerIsComplex = isa<ComplexType>(LongerType.getCanonicalType()); |
| 1127 | QualType Result = |
| 1128 | LongerIsComplex ? LongerType : S.Context.getComplexType(LongerType); |
| 1129 | |
| 1130 | if (PromotePrecision) { |
| 1131 | if (isa<ComplexType>(ShorterType.getCanonicalType())) { |
| 1132 | Shorter = |
| 1133 | S.ImpCastExprToType(Shorter.get(), Result, CK_FloatingComplexCast); |
| 1134 | } else { |
| 1135 | if (LongerIsComplex) |
| 1136 | LongerType = LongerType->castAs<ComplexType>()->getElementType(); |
| 1137 | Shorter = S.ImpCastExprToType(Shorter.get(), LongerType, CK_FloatingCast); |
| 1138 | } |
| 1139 | } |
| 1140 | return Result; |
| 1141 | } |
| 1142 | |
| 1143 | /// Handle arithmetic conversion with complex types. Helper function of |
| 1144 | /// UsualArithmeticConversions() |
| 1145 | static QualType handleComplexConversion(Sema &S, ExprResult &LHS, |
| 1146 | ExprResult &RHS, QualType LHSType, |
| 1147 | QualType RHSType, bool IsCompAssign) { |
| 1148 | // if we have an integer operand, the result is the complex type. |
| 1149 | if (!handleIntegerToComplexFloatConversion(S, RHS, LHS, RHSType, LHSType, |
| 1150 | /*SkipCast=*/false)) |
| 1151 | return LHSType; |
| 1152 | if (!handleIntegerToComplexFloatConversion(S, LHS, RHS, LHSType, RHSType, |
| 1153 | /*SkipCast=*/IsCompAssign)) |
| 1154 | return RHSType; |
| 1155 | |
| 1156 | // Compute the rank of the two types, regardless of whether they are complex. |
| 1157 | int Order = S.Context.getFloatingTypeOrder(LHSType, RHSType); |
| 1158 | if (Order < 0) |
| 1159 | // Promote the precision of the LHS if not an assignment. |
| 1160 | return handleComplexFloatConversion(S, LHS, LHSType, RHSType, |
| 1161 | /*PromotePrecision=*/!IsCompAssign); |
| 1162 | // Promote the precision of the RHS unless it is already the same as the LHS. |
| 1163 | return handleComplexFloatConversion(S, RHS, RHSType, LHSType, |
| 1164 | /*PromotePrecision=*/Order > 0); |
| 1165 | } |
| 1166 | |
| 1167 | /// Handle arithmetic conversion from integer to float. Helper function |
| 1168 | /// of UsualArithmeticConversions() |
| 1169 | static QualType handleIntToFloatConversion(Sema &S, ExprResult &FloatExpr, |
| 1170 | ExprResult &IntExpr, |
| 1171 | QualType FloatTy, QualType IntTy, |
| 1172 | bool ConvertFloat, bool ConvertInt) { |
| 1173 | if (IntTy->isIntegerType()) { |
| 1174 | if (ConvertInt) |
| 1175 | // Convert intExpr to the lhs floating point type. |
| 1176 | IntExpr = S.ImpCastExprToType(IntExpr.get(), FloatTy, |
| 1177 | CK_IntegralToFloating); |
| 1178 | return FloatTy; |
| 1179 | } |
| 1180 | |
| 1181 | // Convert both sides to the appropriate complex float. |
| 1182 | assert(IntTy->isComplexIntegerType())(static_cast <bool> (IntTy->isComplexIntegerType()) ? void (0) : __assert_fail ("IntTy->isComplexIntegerType()" , "clang/lib/Sema/SemaExpr.cpp", 1182, __extension__ __PRETTY_FUNCTION__ )); |
| 1183 | QualType result = S.Context.getComplexType(FloatTy); |
| 1184 | |
| 1185 | // _Complex int -> _Complex float |
| 1186 | if (ConvertInt) |
| 1187 | IntExpr = S.ImpCastExprToType(IntExpr.get(), result, |
| 1188 | CK_IntegralComplexToFloatingComplex); |
| 1189 | |
| 1190 | // float -> _Complex float |
| 1191 | if (ConvertFloat) |
| 1192 | FloatExpr = S.ImpCastExprToType(FloatExpr.get(), result, |
| 1193 | CK_FloatingRealToComplex); |
| 1194 | |
| 1195 | return result; |
| 1196 | } |
| 1197 | |
| 1198 | /// Handle arithmethic conversion with floating point types. Helper |
| 1199 | /// function of UsualArithmeticConversions() |
| 1200 | static QualType handleFloatConversion(Sema &S, ExprResult &LHS, |
| 1201 | ExprResult &RHS, QualType LHSType, |
| 1202 | QualType RHSType, bool IsCompAssign) { |
| 1203 | bool LHSFloat = LHSType->isRealFloatingType(); |
| 1204 | bool RHSFloat = RHSType->isRealFloatingType(); |
| 1205 | |
| 1206 | // N1169 4.1.4: If one of the operands has a floating type and the other |
| 1207 | // operand has a fixed-point type, the fixed-point operand |
| 1208 | // is converted to the floating type [...] |
| 1209 | if (LHSType->isFixedPointType() || RHSType->isFixedPointType()) { |
| 1210 | if (LHSFloat) |
| 1211 | RHS = S.ImpCastExprToType(RHS.get(), LHSType, CK_FixedPointToFloating); |
| 1212 | else if (!IsCompAssign) |
| 1213 | LHS = S.ImpCastExprToType(LHS.get(), RHSType, CK_FixedPointToFloating); |
| 1214 | return LHSFloat ? LHSType : RHSType; |
| 1215 | } |
| 1216 | |
| 1217 | // If we have two real floating types, convert the smaller operand |
| 1218 | // to the bigger result. |
| 1219 | if (LHSFloat && RHSFloat) { |
| 1220 | int order = S.Context.getFloatingTypeOrder(LHSType, RHSType); |
| 1221 | if (order > 0) { |
| 1222 | RHS = S.ImpCastExprToType(RHS.get(), LHSType, CK_FloatingCast); |
| 1223 | return LHSType; |
| 1224 | } |
| 1225 | |
| 1226 | assert(order < 0 && "illegal float comparison")(static_cast <bool> (order < 0 && "illegal float comparison" ) ? void (0) : __assert_fail ("order < 0 && \"illegal float comparison\"" , "clang/lib/Sema/SemaExpr.cpp", 1226, __extension__ __PRETTY_FUNCTION__ )); |
| 1227 | if (!IsCompAssign) |
| 1228 | LHS = S.ImpCastExprToType(LHS.get(), RHSType, CK_FloatingCast); |
| 1229 | return RHSType; |
| 1230 | } |
| 1231 | |
| 1232 | if (LHSFloat) { |
| 1233 | // Half FP has to be promoted to float unless it is natively supported |
| 1234 | if (LHSType->isHalfType() && !S.getLangOpts().NativeHalfType) |
| 1235 | LHSType = S.Context.FloatTy; |
| 1236 | |
| 1237 | return handleIntToFloatConversion(S, LHS, RHS, LHSType, RHSType, |
| 1238 | /*ConvertFloat=*/!IsCompAssign, |
| 1239 | /*ConvertInt=*/ true); |
| 1240 | } |
| 1241 | assert(RHSFloat)(static_cast <bool> (RHSFloat) ? void (0) : __assert_fail ("RHSFloat", "clang/lib/Sema/SemaExpr.cpp", 1241, __extension__ __PRETTY_FUNCTION__)); |
| 1242 | return handleIntToFloatConversion(S, RHS, LHS, RHSType, LHSType, |
| 1243 | /*ConvertFloat=*/ true, |
| 1244 | /*ConvertInt=*/!IsCompAssign); |
| 1245 | } |
| 1246 | |
| 1247 | /// Diagnose attempts to convert between __float128, __ibm128 and |
| 1248 | /// long double if there is no support for such conversion. |
| 1249 | /// Helper function of UsualArithmeticConversions(). |
| 1250 | static bool unsupportedTypeConversion(const Sema &S, QualType LHSType, |
| 1251 | QualType RHSType) { |
| 1252 | // No issue if either is not a floating point type. |
| 1253 | if (!LHSType->isFloatingType() || !RHSType->isFloatingType()) |
| 1254 | return false; |
| 1255 | |
| 1256 | // No issue if both have the same 128-bit float semantics. |
| 1257 | auto *LHSComplex = LHSType->getAs<ComplexType>(); |
| 1258 | auto *RHSComplex = RHSType->getAs<ComplexType>(); |
| 1259 | |
| 1260 | QualType LHSElem = LHSComplex ? LHSComplex->getElementType() : LHSType; |
| 1261 | QualType RHSElem = RHSComplex ? RHSComplex->getElementType() : RHSType; |
| 1262 | |
| 1263 | const llvm::fltSemantics &LHSSem = S.Context.getFloatTypeSemantics(LHSElem); |
| 1264 | const llvm::fltSemantics &RHSSem = S.Context.getFloatTypeSemantics(RHSElem); |
| 1265 | |
| 1266 | if ((&LHSSem != &llvm::APFloat::PPCDoubleDouble() || |
| 1267 | &RHSSem != &llvm::APFloat::IEEEquad()) && |
| 1268 | (&LHSSem != &llvm::APFloat::IEEEquad() || |
| 1269 | &RHSSem != &llvm::APFloat::PPCDoubleDouble())) |
| 1270 | return false; |
| 1271 | |
| 1272 | return true; |
| 1273 | } |
| 1274 | |
| 1275 | typedef ExprResult PerformCastFn(Sema &S, Expr *operand, QualType toType); |
| 1276 | |
| 1277 | namespace { |
| 1278 | /// These helper callbacks are placed in an anonymous namespace to |
| 1279 | /// permit their use as function template parameters. |
| 1280 | ExprResult doIntegralCast(Sema &S, Expr *op, QualType toType) { |
| 1281 | return S.ImpCastExprToType(op, toType, CK_IntegralCast); |
| 1282 | } |
| 1283 | |
| 1284 | ExprResult doComplexIntegralCast(Sema &S, Expr *op, QualType toType) { |
| 1285 | return S.ImpCastExprToType(op, S.Context.getComplexType(toType), |
| 1286 | CK_IntegralComplexCast); |
| 1287 | } |
| 1288 | } |
| 1289 | |
| 1290 | /// Handle integer arithmetic conversions. Helper function of |
| 1291 | /// UsualArithmeticConversions() |
| 1292 | template <PerformCastFn doLHSCast, PerformCastFn doRHSCast> |
| 1293 | static QualType handleIntegerConversion(Sema &S, ExprResult &LHS, |
| 1294 | ExprResult &RHS, QualType LHSType, |
| 1295 | QualType RHSType, bool IsCompAssign) { |
| 1296 | // The rules for this case are in C99 6.3.1.8 |
| 1297 | int order = S.Context.getIntegerTypeOrder(LHSType, RHSType); |
| 1298 | bool LHSSigned = LHSType->hasSignedIntegerRepresentation(); |
| 1299 | bool RHSSigned = RHSType->hasSignedIntegerRepresentation(); |
| 1300 | if (LHSSigned == RHSSigned) { |
| 1301 | // Same signedness; use the higher-ranked type |
| 1302 | if (order >= 0) { |
| 1303 | RHS = (*doRHSCast)(S, RHS.get(), LHSType); |
| 1304 | return LHSType; |
| 1305 | } else if (!IsCompAssign) |
| 1306 | LHS = (*doLHSCast)(S, LHS.get(), RHSType); |
| 1307 | return RHSType; |
| 1308 | } else if (order != (LHSSigned ? 1 : -1)) { |
| 1309 | // The unsigned type has greater than or equal rank to the |
| 1310 | // signed type, so use the unsigned type |
| 1311 | if (RHSSigned) { |
| 1312 | RHS = (*doRHSCast)(S, RHS.get(), LHSType); |
| 1313 | return LHSType; |
| 1314 | } else if (!IsCompAssign) |
| 1315 | LHS = (*doLHSCast)(S, LHS.get(), RHSType); |
| 1316 | return RHSType; |
| 1317 | } else if (S.Context.getIntWidth(LHSType) != S.Context.getIntWidth(RHSType)) { |
| 1318 | // The two types are different widths; if we are here, that |
| 1319 | // means the signed type is larger than the unsigned type, so |
| 1320 | // use the signed type. |
| 1321 | if (LHSSigned) { |
| 1322 | RHS = (*doRHSCast)(S, RHS.get(), LHSType); |
| 1323 | return LHSType; |
| 1324 | } else if (!IsCompAssign) |
| 1325 | LHS = (*doLHSCast)(S, LHS.get(), RHSType); |
| 1326 | return RHSType; |
| 1327 | } else { |
| 1328 | // The signed type is higher-ranked than the unsigned type, |
| 1329 | // but isn't actually any bigger (like unsigned int and long |
| 1330 | // on most 32-bit systems). Use the unsigned type corresponding |
| 1331 | // to the signed type. |
| 1332 | QualType result = |
| 1333 | S.Context.getCorrespondingUnsignedType(LHSSigned ? LHSType : RHSType); |
| 1334 | RHS = (*doRHSCast)(S, RHS.get(), result); |
| 1335 | if (!IsCompAssign) |
| 1336 | LHS = (*doLHSCast)(S, LHS.get(), result); |
| 1337 | return result; |
| 1338 | } |
| 1339 | } |
| 1340 | |
| 1341 | /// Handle conversions with GCC complex int extension. Helper function |
| 1342 | /// of UsualArithmeticConversions() |
| 1343 | static QualType handleComplexIntConversion(Sema &S, ExprResult &LHS, |
| 1344 | ExprResult &RHS, QualType LHSType, |
| 1345 | QualType RHSType, |
| 1346 | bool IsCompAssign) { |
| 1347 | const ComplexType *LHSComplexInt = LHSType->getAsComplexIntegerType(); |
| 1348 | const ComplexType *RHSComplexInt = RHSType->getAsComplexIntegerType(); |
| 1349 | |
| 1350 | if (LHSComplexInt && RHSComplexInt) { |
| 1351 | QualType LHSEltType = LHSComplexInt->getElementType(); |
| 1352 | QualType RHSEltType = RHSComplexInt->getElementType(); |
| 1353 | QualType ScalarType = |
| 1354 | handleIntegerConversion<doComplexIntegralCast, doComplexIntegralCast> |
| 1355 | (S, LHS, RHS, LHSEltType, RHSEltType, IsCompAssign); |
| 1356 | |
| 1357 | return S.Context.getComplexType(ScalarType); |
| 1358 | } |
| 1359 | |
| 1360 | if (LHSComplexInt) { |
| 1361 | QualType LHSEltType = LHSComplexInt->getElementType(); |
| 1362 | QualType ScalarType = |
| 1363 | handleIntegerConversion<doComplexIntegralCast, doIntegralCast> |
| 1364 | (S, LHS, RHS, LHSEltType, RHSType, IsCompAssign); |
| 1365 | QualType ComplexType = S.Context.getComplexType(ScalarType); |
| 1366 | RHS = S.ImpCastExprToType(RHS.get(), ComplexType, |
| 1367 | CK_IntegralRealToComplex); |
| 1368 | |
| 1369 | return ComplexType; |
| 1370 | } |
| 1371 | |
| 1372 | assert(RHSComplexInt)(static_cast <bool> (RHSComplexInt) ? void (0) : __assert_fail ("RHSComplexInt", "clang/lib/Sema/SemaExpr.cpp", 1372, __extension__ __PRETTY_FUNCTION__)); |
| 1373 | |
| 1374 | QualType RHSEltType = RHSComplexInt->getElementType(); |
| 1375 | QualType ScalarType = |
| 1376 | handleIntegerConversion<doIntegralCast, doComplexIntegralCast> |
| 1377 | (S, LHS, RHS, LHSType, RHSEltType, IsCompAssign); |
| 1378 | QualType ComplexType = S.Context.getComplexType(ScalarType); |
| 1379 | |
| 1380 | if (!IsCompAssign) |
| 1381 | LHS = S.ImpCastExprToType(LHS.get(), ComplexType, |
| 1382 | CK_IntegralRealToComplex); |
| 1383 | return ComplexType; |
| 1384 | } |
| 1385 | |
| 1386 | /// Return the rank of a given fixed point or integer type. The value itself |
| 1387 | /// doesn't matter, but the values must be increasing with proper increasing |
| 1388 | /// rank as described in N1169 4.1.1. |
| 1389 | static unsigned GetFixedPointRank(QualType Ty) { |
| 1390 | const auto *BTy = Ty->getAs<BuiltinType>(); |
| 1391 | assert(BTy && "Expected a builtin type.")(static_cast <bool> (BTy && "Expected a builtin type." ) ? void (0) : __assert_fail ("BTy && \"Expected a builtin type.\"" , "clang/lib/Sema/SemaExpr.cpp", 1391, __extension__ __PRETTY_FUNCTION__ )); |
| 1392 | |
| 1393 | switch (BTy->getKind()) { |
| 1394 | case BuiltinType::ShortFract: |
| 1395 | case BuiltinType::UShortFract: |
| 1396 | case BuiltinType::SatShortFract: |
| 1397 | case BuiltinType::SatUShortFract: |
| 1398 | return 1; |
| 1399 | case BuiltinType::Fract: |
| 1400 | case BuiltinType::UFract: |
| 1401 | case BuiltinType::SatFract: |
| 1402 | case BuiltinType::SatUFract: |
| 1403 | return 2; |
| 1404 | case BuiltinType::LongFract: |
| 1405 | case BuiltinType::ULongFract: |
| 1406 | case BuiltinType::SatLongFract: |
| 1407 | case BuiltinType::SatULongFract: |
| 1408 | return 3; |
| 1409 | case BuiltinType::ShortAccum: |
| 1410 | case BuiltinType::UShortAccum: |
| 1411 | case BuiltinType::SatShortAccum: |
| 1412 | case BuiltinType::SatUShortAccum: |
| 1413 | return 4; |
| 1414 | case BuiltinType::Accum: |
| 1415 | case BuiltinType::UAccum: |
| 1416 | case BuiltinType::SatAccum: |
| 1417 | case BuiltinType::SatUAccum: |
| 1418 | return 5; |
| 1419 | case BuiltinType::LongAccum: |
| 1420 | case BuiltinType::ULongAccum: |
| 1421 | case BuiltinType::SatLongAccum: |
| 1422 | case BuiltinType::SatULongAccum: |
| 1423 | return 6; |
| 1424 | default: |
| 1425 | if (BTy->isInteger()) |
| 1426 | return 0; |
| 1427 | llvm_unreachable("Unexpected fixed point or integer type")::llvm::llvm_unreachable_internal("Unexpected fixed point or integer type" , "clang/lib/Sema/SemaExpr.cpp", 1427); |
| 1428 | } |
| 1429 | } |
| 1430 | |
| 1431 | /// handleFixedPointConversion - Fixed point operations between fixed |
| 1432 | /// point types and integers or other fixed point types do not fall under |
| 1433 | /// usual arithmetic conversion since these conversions could result in loss |
| 1434 | /// of precsision (N1169 4.1.4). These operations should be calculated with |
| 1435 | /// the full precision of their result type (N1169 4.1.6.2.1). |
| 1436 | static QualType handleFixedPointConversion(Sema &S, QualType LHSTy, |
| 1437 | QualType RHSTy) { |
| 1438 | assert((LHSTy->isFixedPointType() || RHSTy->isFixedPointType()) &&(static_cast <bool> ((LHSTy->isFixedPointType() || RHSTy ->isFixedPointType()) && "Expected at least one of the operands to be a fixed point type" ) ? void (0) : __assert_fail ("(LHSTy->isFixedPointType() || RHSTy->isFixedPointType()) && \"Expected at least one of the operands to be a fixed point type\"" , "clang/lib/Sema/SemaExpr.cpp", 1439, __extension__ __PRETTY_FUNCTION__ )) |
| 1439 | "Expected at least one of the operands to be a fixed point type")(static_cast <bool> ((LHSTy->isFixedPointType() || RHSTy ->isFixedPointType()) && "Expected at least one of the operands to be a fixed point type" ) ? void (0) : __assert_fail ("(LHSTy->isFixedPointType() || RHSTy->isFixedPointType()) && \"Expected at least one of the operands to be a fixed point type\"" , "clang/lib/Sema/SemaExpr.cpp", 1439, __extension__ __PRETTY_FUNCTION__ )); |
| 1440 | assert((LHSTy->isFixedPointOrIntegerType() ||(static_cast <bool> ((LHSTy->isFixedPointOrIntegerType () || RHSTy->isFixedPointOrIntegerType()) && "Special fixed point arithmetic operation conversions are only " "applied to ints or other fixed point types") ? void (0) : __assert_fail ("(LHSTy->isFixedPointOrIntegerType() || RHSTy->isFixedPointOrIntegerType()) && \"Special fixed point arithmetic operation conversions are only \" \"applied to ints or other fixed point types\"" , "clang/lib/Sema/SemaExpr.cpp", 1443, __extension__ __PRETTY_FUNCTION__ )) |
| 1441 | RHSTy->isFixedPointOrIntegerType()) &&(static_cast <bool> ((LHSTy->isFixedPointOrIntegerType () || RHSTy->isFixedPointOrIntegerType()) && "Special fixed point arithmetic operation conversions are only " "applied to ints or other fixed point types") ? void (0) : __assert_fail ("(LHSTy->isFixedPointOrIntegerType() || RHSTy->isFixedPointOrIntegerType()) && \"Special fixed point arithmetic operation conversions are only \" \"applied to ints or other fixed point types\"" , "clang/lib/Sema/SemaExpr.cpp", 1443, __extension__ __PRETTY_FUNCTION__ )) |
| 1442 | "Special fixed point arithmetic operation conversions are only "(static_cast <bool> ((LHSTy->isFixedPointOrIntegerType () || RHSTy->isFixedPointOrIntegerType()) && "Special fixed point arithmetic operation conversions are only " "applied to ints or other fixed point types") ? void (0) : __assert_fail ("(LHSTy->isFixedPointOrIntegerType() || RHSTy->isFixedPointOrIntegerType()) && \"Special fixed point arithmetic operation conversions are only \" \"applied to ints or other fixed point types\"" , "clang/lib/Sema/SemaExpr.cpp", 1443, __extension__ __PRETTY_FUNCTION__ )) |
| 1443 | "applied to ints or other fixed point types")(static_cast <bool> ((LHSTy->isFixedPointOrIntegerType () || RHSTy->isFixedPointOrIntegerType()) && "Special fixed point arithmetic operation conversions are only " "applied to ints or other fixed point types") ? void (0) : __assert_fail ("(LHSTy->isFixedPointOrIntegerType() || RHSTy->isFixedPointOrIntegerType()) && \"Special fixed point arithmetic operation conversions are only \" \"applied to ints or other fixed point types\"" , "clang/lib/Sema/SemaExpr.cpp", 1443, __extension__ __PRETTY_FUNCTION__ )); |
| 1444 | |
| 1445 | // If one operand has signed fixed-point type and the other operand has |
| 1446 | // unsigned fixed-point type, then the unsigned fixed-point operand is |
| 1447 | // converted to its corresponding signed fixed-point type and the resulting |
| 1448 | // type is the type of the converted operand. |
| 1449 | if (RHSTy->isSignedFixedPointType() && LHSTy->isUnsignedFixedPointType()) |
| 1450 | LHSTy = S.Context.getCorrespondingSignedFixedPointType(LHSTy); |
| 1451 | else if (RHSTy->isUnsignedFixedPointType() && LHSTy->isSignedFixedPointType()) |
| 1452 | RHSTy = S.Context.getCorrespondingSignedFixedPointType(RHSTy); |
| 1453 | |
| 1454 | // The result type is the type with the highest rank, whereby a fixed-point |
| 1455 | // conversion rank is always greater than an integer conversion rank; if the |
| 1456 | // type of either of the operands is a saturating fixedpoint type, the result |
| 1457 | // type shall be the saturating fixed-point type corresponding to the type |
| 1458 | // with the highest rank; the resulting value is converted (taking into |
| 1459 | // account rounding and overflow) to the precision of the resulting type. |
| 1460 | // Same ranks between signed and unsigned types are resolved earlier, so both |
| 1461 | // types are either signed or both unsigned at this point. |
| 1462 | unsigned LHSTyRank = GetFixedPointRank(LHSTy); |
| 1463 | unsigned RHSTyRank = GetFixedPointRank(RHSTy); |
| 1464 | |
| 1465 | QualType ResultTy = LHSTyRank > RHSTyRank ? LHSTy : RHSTy; |
| 1466 | |
| 1467 | if (LHSTy->isSaturatedFixedPointType() || RHSTy->isSaturatedFixedPointType()) |
| 1468 | ResultTy = S.Context.getCorrespondingSaturatedType(ResultTy); |
| 1469 | |
| 1470 | return ResultTy; |
| 1471 | } |
| 1472 | |
| 1473 | /// Check that the usual arithmetic conversions can be performed on this pair of |
| 1474 | /// expressions that might be of enumeration type. |
| 1475 | static void checkEnumArithmeticConversions(Sema &S, Expr *LHS, Expr *RHS, |
| 1476 | SourceLocation Loc, |
| 1477 | Sema::ArithConvKind ACK) { |
| 1478 | // C++2a [expr.arith.conv]p1: |
| 1479 | // If one operand is of enumeration type and the other operand is of a |
| 1480 | // different enumeration type or a floating-point type, this behavior is |
| 1481 | // deprecated ([depr.arith.conv.enum]). |
| 1482 | // |
| 1483 | // Warn on this in all language modes. Produce a deprecation warning in C++20. |
| 1484 | // Eventually we will presumably reject these cases (in C++23 onwards?). |
| 1485 | QualType L = LHS->getType(), R = RHS->getType(); |
| 1486 | bool LEnum = L->isUnscopedEnumerationType(), |
| 1487 | REnum = R->isUnscopedEnumerationType(); |
| 1488 | bool IsCompAssign = ACK == Sema::ACK_CompAssign; |
| 1489 | if ((!IsCompAssign && LEnum && R->isFloatingType()) || |
| 1490 | (REnum && L->isFloatingType())) { |
| 1491 | S.Diag(Loc, S.getLangOpts().CPlusPlus20 |
| 1492 | ? diag::warn_arith_conv_enum_float_cxx20 |
| 1493 | : diag::warn_arith_conv_enum_float) |
| 1494 | << LHS->getSourceRange() << RHS->getSourceRange() |
| 1495 | << (int)ACK << LEnum << L << R; |
| 1496 | } else if (!IsCompAssign && LEnum && REnum && |
| 1497 | !S.Context.hasSameUnqualifiedType(L, R)) { |
| 1498 | unsigned DiagID; |
| 1499 | if (!L->castAs<EnumType>()->getDecl()->hasNameForLinkage() || |
| 1500 | !R->castAs<EnumType>()->getDecl()->hasNameForLinkage()) { |
| 1501 | // If either enumeration type is unnamed, it's less likely that the |
| 1502 | // user cares about this, but this situation is still deprecated in |
| 1503 | // C++2a. Use a different warning group. |
| 1504 | DiagID = S.getLangOpts().CPlusPlus20 |
| 1505 | ? diag::warn_arith_conv_mixed_anon_enum_types_cxx20 |
| 1506 | : diag::warn_arith_conv_mixed_anon_enum_types; |
| 1507 | } else if (ACK == Sema::ACK_Conditional) { |
| 1508 | // Conditional expressions are separated out because they have |
| 1509 | // historically had a different warning flag. |
| 1510 | DiagID = S.getLangOpts().CPlusPlus20 |
| 1511 | ? diag::warn_conditional_mixed_enum_types_cxx20 |
| 1512 | : diag::warn_conditional_mixed_enum_types; |
| 1513 | } else if (ACK == Sema::ACK_Comparison) { |
| 1514 | // Comparison expressions are separated out because they have |
| 1515 | // historically had a different warning flag. |
| 1516 | DiagID = S.getLangOpts().CPlusPlus20 |
| 1517 | ? diag::warn_comparison_mixed_enum_types_cxx20 |
| 1518 | : diag::warn_comparison_mixed_enum_types; |
| 1519 | } else { |
| 1520 | DiagID = S.getLangOpts().CPlusPlus20 |
| 1521 | ? diag::warn_arith_conv_mixed_enum_types_cxx20 |
| 1522 | : diag::warn_arith_conv_mixed_enum_types; |
| 1523 | } |
| 1524 | S.Diag(Loc, DiagID) << LHS->getSourceRange() << RHS->getSourceRange() |
| 1525 | << (int)ACK << L << R; |
| 1526 | } |
| 1527 | } |
| 1528 | |
| 1529 | /// UsualArithmeticConversions - Performs various conversions that are common to |
| 1530 | /// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this |
| 1531 | /// routine returns the first non-arithmetic type found. The client is |
| 1532 | /// responsible for emitting appropriate error diagnostics. |
| 1533 | QualType Sema::UsualArithmeticConversions(ExprResult &LHS, ExprResult &RHS, |
| 1534 | SourceLocation Loc, |
| 1535 | ArithConvKind ACK) { |
| 1536 | checkEnumArithmeticConversions(*this, LHS.get(), RHS.get(), Loc, ACK); |
| 1537 | |
| 1538 | if (ACK != ACK_CompAssign) { |
| 1539 | LHS = UsualUnaryConversions(LHS.get()); |
| 1540 | if (LHS.isInvalid()) |
| 1541 | return QualType(); |
| 1542 | } |
| 1543 | |
| 1544 | RHS = UsualUnaryConversions(RHS.get()); |
| 1545 | if (RHS.isInvalid()) |
| 1546 | return QualType(); |
| 1547 | |
| 1548 | // For conversion purposes, we ignore any qualifiers. |
| 1549 | // For example, "const float" and "float" are equivalent. |
| 1550 | QualType LHSType = LHS.get()->getType().getUnqualifiedType(); |
| 1551 | QualType RHSType = RHS.get()->getType().getUnqualifiedType(); |
| 1552 | |
| 1553 | // For conversion purposes, we ignore any atomic qualifier on the LHS. |
| 1554 | if (const AtomicType *AtomicLHS = LHSType->getAs<AtomicType>()) |
| 1555 | LHSType = AtomicLHS->getValueType(); |
| 1556 | |
| 1557 | // If both types are identical, no conversion is needed. |
| 1558 | if (Context.hasSameType(LHSType, RHSType)) |
| 1559 | return Context.getCommonSugaredType(LHSType, RHSType); |
| 1560 | |
| 1561 | // If either side is a non-arithmetic type (e.g. a pointer), we are done. |
| 1562 | // The caller can deal with this (e.g. pointer + int). |
| 1563 | if (!LHSType->isArithmeticType() || !RHSType->isArithmeticType()) |
| 1564 | return QualType(); |
| 1565 | |
| 1566 | // Apply unary and bitfield promotions to the LHS's type. |
| 1567 | QualType LHSUnpromotedType = LHSType; |
| 1568 | if (Context.isPromotableIntegerType(LHSType)) |
| 1569 | LHSType = Context.getPromotedIntegerType(LHSType); |
| 1570 | QualType LHSBitfieldPromoteTy = Context.isPromotableBitField(LHS.get()); |
| 1571 | if (!LHSBitfieldPromoteTy.isNull()) |
| 1572 | LHSType = LHSBitfieldPromoteTy; |
| 1573 | if (LHSType != LHSUnpromotedType && ACK != ACK_CompAssign) |
| 1574 | LHS = ImpCastExprToType(LHS.get(), LHSType, CK_IntegralCast); |
| 1575 | |
| 1576 | // If both types are identical, no conversion is needed. |
| 1577 | if (Context.hasSameType(LHSType, RHSType)) |
| 1578 | return Context.getCommonSugaredType(LHSType, RHSType); |
| 1579 | |
| 1580 | // At this point, we have two different arithmetic types. |
| 1581 | |
| 1582 | // Diagnose attempts to convert between __ibm128, __float128 and long double |
| 1583 | // where such conversions currently can't be handled. |
| 1584 | if (unsupportedTypeConversion(*this, LHSType, RHSType)) |
| 1585 | return QualType(); |
| 1586 | |
| 1587 | // Handle complex types first (C99 6.3.1.8p1). |
| 1588 | if (LHSType->isComplexType() || RHSType->isComplexType()) |
| 1589 | return handleComplexConversion(*this, LHS, RHS, LHSType, RHSType, |
| 1590 | ACK == ACK_CompAssign); |
| 1591 | |
| 1592 | // Now handle "real" floating types (i.e. float, double, long double). |
| 1593 | if (LHSType->isRealFloatingType() || RHSType->isRealFloatingType()) |
| 1594 | return handleFloatConversion(*this, LHS, RHS, LHSType, RHSType, |
| 1595 | ACK == ACK_CompAssign); |
| 1596 | |
| 1597 | // Handle GCC complex int extension. |
| 1598 | if (LHSType->isComplexIntegerType() || RHSType->isComplexIntegerType()) |
| 1599 | return handleComplexIntConversion(*this, LHS, RHS, LHSType, RHSType, |
| 1600 | ACK == ACK_CompAssign); |
| 1601 | |
| 1602 | if (LHSType->isFixedPointType() || RHSType->isFixedPointType()) |
| 1603 | return handleFixedPointConversion(*this, LHSType, RHSType); |
| 1604 | |
| 1605 | // Finally, we have two differing integer types. |
| 1606 | return handleIntegerConversion<doIntegralCast, doIntegralCast> |
| 1607 | (*this, LHS, RHS, LHSType, RHSType, ACK == ACK_CompAssign); |
| 1608 | } |
| 1609 | |
| 1610 | //===----------------------------------------------------------------------===// |
| 1611 | // Semantic Analysis for various Expression Types |
| 1612 | //===----------------------------------------------------------------------===// |
| 1613 | |
| 1614 | |
| 1615 | ExprResult |
| 1616 | Sema::ActOnGenericSelectionExpr(SourceLocation KeyLoc, |
| 1617 | SourceLocation DefaultLoc, |
| 1618 | SourceLocation RParenLoc, |
| 1619 | Expr *ControllingExpr, |
| 1620 | ArrayRef<ParsedType> ArgTypes, |
| 1621 | ArrayRef<Expr *> ArgExprs) { |
| 1622 | unsigned NumAssocs = ArgTypes.size(); |
| 1623 | assert(NumAssocs == ArgExprs.size())(static_cast <bool> (NumAssocs == ArgExprs.size()) ? void (0) : __assert_fail ("NumAssocs == ArgExprs.size()", "clang/lib/Sema/SemaExpr.cpp" , 1623, __extension__ __PRETTY_FUNCTION__)); |
| 1624 | |
| 1625 | TypeSourceInfo **Types = new TypeSourceInfo*[NumAssocs]; |
| 1626 | for (unsigned i = 0; i < NumAssocs; ++i) { |
| 1627 | if (ArgTypes[i]) |
| 1628 | (void) GetTypeFromParser(ArgTypes[i], &Types[i]); |
| 1629 | else |
| 1630 | Types[i] = nullptr; |
| 1631 | } |
| 1632 | |
| 1633 | ExprResult ER = |
| 1634 | CreateGenericSelectionExpr(KeyLoc, DefaultLoc, RParenLoc, ControllingExpr, |
| 1635 | llvm::ArrayRef(Types, NumAssocs), ArgExprs); |
| 1636 | delete [] Types; |
| 1637 | return ER; |
| 1638 | } |
| 1639 | |
| 1640 | ExprResult |
| 1641 | Sema::CreateGenericSelectionExpr(SourceLocation KeyLoc, |
| 1642 | SourceLocation DefaultLoc, |
| 1643 | SourceLocation RParenLoc, |
| 1644 | Expr *ControllingExpr, |
| 1645 | ArrayRef<TypeSourceInfo *> Types, |
| 1646 | ArrayRef<Expr *> Exprs) { |
| 1647 | unsigned NumAssocs = Types.size(); |
| 1648 | assert(NumAssocs == Exprs.size())(static_cast <bool> (NumAssocs == Exprs.size()) ? void ( 0) : __assert_fail ("NumAssocs == Exprs.size()", "clang/lib/Sema/SemaExpr.cpp" , 1648, __extension__ __PRETTY_FUNCTION__)); |
| 1649 | |
| 1650 | // Decay and strip qualifiers for the controlling expression type, and handle |
| 1651 | // placeholder type replacement. See committee discussion from WG14 DR423. |
| 1652 | { |
| 1653 | EnterExpressionEvaluationContext Unevaluated( |
| 1654 | *this, Sema::ExpressionEvaluationContext::Unevaluated); |
| 1655 | ExprResult R = DefaultFunctionArrayLvalueConversion(ControllingExpr); |
| 1656 | if (R.isInvalid()) |
| 1657 | return ExprError(); |
| 1658 | ControllingExpr = R.get(); |
| 1659 | } |
| 1660 | |
| 1661 | bool TypeErrorFound = false, |
| 1662 | IsResultDependent = ControllingExpr->isTypeDependent(), |
| 1663 | ContainsUnexpandedParameterPack |
| 1664 | = ControllingExpr->containsUnexpandedParameterPack(); |
| 1665 | |
| 1666 | // The controlling expression is an unevaluated operand, so side effects are |
| 1667 | // likely unintended. |
| 1668 | if (!inTemplateInstantiation() && !IsResultDependent && |
| 1669 | ControllingExpr->HasSideEffects(Context, false)) |
| 1670 | Diag(ControllingExpr->getExprLoc(), |
| 1671 | diag::warn_side_effects_unevaluated_context); |
| 1672 | |
| 1673 | for (unsigned i = 0; i < NumAssocs; ++i) { |
| 1674 | if (Exprs[i]->containsUnexpandedParameterPack()) |
| 1675 | ContainsUnexpandedParameterPack = true; |
| 1676 | |
| 1677 | if (Types[i]) { |
| 1678 | if (Types[i]->getType()->containsUnexpandedParameterPack()) |
| 1679 | ContainsUnexpandedParameterPack = true; |
| 1680 | |
| 1681 | if (Types[i]->getType()->isDependentType()) { |
| 1682 | IsResultDependent = true; |
| 1683 | } else { |
| 1684 | // C11 6.5.1.1p2 "The type name in a generic association shall specify a |
| 1685 | // complete object type other than a variably modified type." |
| 1686 | unsigned D = 0; |
| 1687 | if (Types[i]->getType()->isIncompleteType()) |
| 1688 | D = diag::err_assoc_type_incomplete; |
| 1689 | else if (!Types[i]->getType()->isObjectType()) |
| 1690 | D = diag::err_assoc_type_nonobject; |
| 1691 | else if (Types[i]->getType()->isVariablyModifiedType()) |
| 1692 | D = diag::err_assoc_type_variably_modified; |
| 1693 | else { |
| 1694 | // Because the controlling expression undergoes lvalue conversion, |
| 1695 | // array conversion, and function conversion, an association which is |
| 1696 | // of array type, function type, or is qualified can never be |
| 1697 | // reached. We will warn about this so users are less surprised by |
| 1698 | // the unreachable association. However, we don't have to handle |
| 1699 | // function types; that's not an object type, so it's handled above. |
| 1700 | // |
| 1701 | // The logic is somewhat different for C++ because C++ has different |
| 1702 | // lvalue to rvalue conversion rules than C. [conv.lvalue]p1 says, |
| 1703 | // If T is a non-class type, the type of the prvalue is the cv- |
| 1704 | // unqualified version of T. Otherwise, the type of the prvalue is T. |
| 1705 | // The result of these rules is that all qualified types in an |
| 1706 | // association in C are unreachable, and in C++, only qualified non- |
| 1707 | // class types are unreachable. |
| 1708 | unsigned Reason = 0; |
| 1709 | QualType QT = Types[i]->getType(); |
| 1710 | if (QT->isArrayType()) |
| 1711 | Reason = 1; |
| 1712 | else if (QT.hasQualifiers() && |
| 1713 | (!LangOpts.CPlusPlus || !QT->isRecordType())) |
| 1714 | Reason = 2; |
| 1715 | |
| 1716 | if (Reason) |
| 1717 | Diag(Types[i]->getTypeLoc().getBeginLoc(), |
| 1718 | diag::warn_unreachable_association) |
| 1719 | << QT << (Reason - 1); |
| 1720 | } |
| 1721 | |
| 1722 | if (D != 0) { |
| 1723 | Diag(Types[i]->getTypeLoc().getBeginLoc(), D) |
| 1724 | << Types[i]->getTypeLoc().getSourceRange() |
| 1725 | << Types[i]->getType(); |
| 1726 | TypeErrorFound = true; |
| 1727 | } |
| 1728 | |
| 1729 | // C11 6.5.1.1p2 "No two generic associations in the same generic |
| 1730 | // selection shall specify compatible types." |
| 1731 | for (unsigned j = i+1; j < NumAssocs; ++j) |
| 1732 | if (Types[j] && !Types[j]->getType()->isDependentType() && |
| 1733 | Context.typesAreCompatible(Types[i]->getType(), |
| 1734 | Types[j]->getType())) { |
| 1735 | Diag(Types[j]->getTypeLoc().getBeginLoc(), |
| 1736 | diag::err_assoc_compatible_types) |
| 1737 | << Types[j]->getTypeLoc().getSourceRange() |
| 1738 | << Types[j]->getType() |
| 1739 | << Types[i]->getType(); |
| 1740 | Diag(Types[i]->getTypeLoc().getBeginLoc(), |
| 1741 | diag::note_compat_assoc) |
| 1742 | << Types[i]->getTypeLoc().getSourceRange() |
| 1743 | << Types[i]->getType(); |
| 1744 | TypeErrorFound = true; |
| 1745 | } |
| 1746 | } |
| 1747 | } |
| 1748 | } |
| 1749 | if (TypeErrorFound) |
| 1750 | return ExprError(); |
| 1751 | |
| 1752 | // If we determined that the generic selection is result-dependent, don't |
| 1753 | // try to compute the result expression. |
| 1754 | if (IsResultDependent) |
| 1755 | return GenericSelectionExpr::Create(Context, KeyLoc, ControllingExpr, Types, |
| 1756 | Exprs, DefaultLoc, RParenLoc, |
| 1757 | ContainsUnexpandedParameterPack); |
| 1758 | |
| 1759 | SmallVector<unsigned, 1> CompatIndices; |
| 1760 | unsigned DefaultIndex = -1U; |
| 1761 | // Look at the canonical type of the controlling expression in case it was a |
| 1762 | // deduced type like __auto_type. However, when issuing diagnostics, use the |
| 1763 | // type the user wrote in source rather than the canonical one. |
| 1764 | for (unsigned i = 0; i < NumAssocs; ++i) { |
| 1765 | if (!Types[i]) |
| 1766 | DefaultIndex = i; |
| 1767 | else if (Context.typesAreCompatible( |
| 1768 | ControllingExpr->getType().getCanonicalType(), |
| 1769 | Types[i]->getType())) |
| 1770 | CompatIndices.push_back(i); |
| 1771 | } |
| 1772 | |
| 1773 | // C11 6.5.1.1p2 "The controlling expression of a generic selection shall have |
| 1774 | // type compatible with at most one of the types named in its generic |
| 1775 | // association list." |
| 1776 | if (CompatIndices.size() > 1) { |
| 1777 | // We strip parens here because the controlling expression is typically |
| 1778 | // parenthesized in macro definitions. |
| 1779 | ControllingExpr = ControllingExpr->IgnoreParens(); |
| 1780 | Diag(ControllingExpr->getBeginLoc(), diag::err_generic_sel_multi_match) |
| 1781 | << ControllingExpr->getSourceRange() << ControllingExpr->getType() |
| 1782 | << (unsigned)CompatIndices.size(); |
| 1783 | for (unsigned I : CompatIndices) { |
| 1784 | Diag(Types[I]->getTypeLoc().getBeginLoc(), |
| 1785 | diag::note_compat_assoc) |
| 1786 | << Types[I]->getTypeLoc().getSourceRange() |
| 1787 | << Types[I]->getType(); |
| 1788 | } |
| 1789 | return ExprError(); |
| 1790 | } |
| 1791 | |
| 1792 | // C11 6.5.1.1p2 "If a generic selection has no default generic association, |
| 1793 | // its controlling expression shall have type compatible with exactly one of |
| 1794 | // the types named in its generic association list." |
| 1795 | if (DefaultIndex == -1U && CompatIndices.size() == 0) { |
| 1796 | // We strip parens here because the controlling expression is typically |
| 1797 | // parenthesized in macro definitions. |
| 1798 | ControllingExpr = ControllingExpr->IgnoreParens(); |
| 1799 | Diag(ControllingExpr->getBeginLoc(), diag::err_generic_sel_no_match) |
| 1800 | << ControllingExpr->getSourceRange() << ControllingExpr->getType(); |
| 1801 | return ExprError(); |
| 1802 | } |
| 1803 | |
| 1804 | // C11 6.5.1.1p3 "If a generic selection has a generic association with a |
| 1805 | // type name that is compatible with the type of the controlling expression, |
| 1806 | // then the result expression of the generic selection is the expression |
| 1807 | // in that generic association. Otherwise, the result expression of the |
| 1808 | // generic selection is the expression in the default generic association." |
| 1809 | unsigned ResultIndex = |
| 1810 | CompatIndices.size() ? CompatIndices[0] : DefaultIndex; |
| 1811 | |
| 1812 | return GenericSelectionExpr::Create( |
| 1813 | Context, KeyLoc, ControllingExpr, Types, Exprs, DefaultLoc, RParenLoc, |
| 1814 | ContainsUnexpandedParameterPack, ResultIndex); |
| 1815 | } |
| 1816 | |
| 1817 | /// getUDSuffixLoc - Create a SourceLocation for a ud-suffix, given the |
| 1818 | /// location of the token and the offset of the ud-suffix within it. |
| 1819 | static SourceLocation getUDSuffixLoc(Sema &S, SourceLocation TokLoc, |
| 1820 | unsigned Offset) { |
| 1821 | return Lexer::AdvanceToTokenCharacter(TokLoc, Offset, S.getSourceManager(), |
| 1822 | S.getLangOpts()); |
| 1823 | } |
| 1824 | |
| 1825 | /// BuildCookedLiteralOperatorCall - A user-defined literal was found. Look up |
| 1826 | /// the corresponding cooked (non-raw) literal operator, and build a call to it. |
| 1827 | static ExprResult BuildCookedLiteralOperatorCall(Sema &S, Scope *Scope, |
| 1828 | IdentifierInfo *UDSuffix, |
| 1829 | SourceLocation UDSuffixLoc, |
| 1830 | ArrayRef<Expr*> Args, |
| 1831 | SourceLocation LitEndLoc) { |
| 1832 | assert(Args.size() <= 2 && "too many arguments for literal operator")(static_cast <bool> (Args.size() <= 2 && "too many arguments for literal operator" ) ? void (0) : __assert_fail ("Args.size() <= 2 && \"too many arguments for literal operator\"" , "clang/lib/Sema/SemaExpr.cpp", 1832, __extension__ __PRETTY_FUNCTION__ )); |
| 1833 | |
| 1834 | QualType ArgTy[2]; |
| 1835 | for (unsigned ArgIdx = 0; ArgIdx != Args.size(); ++ArgIdx) { |
| 1836 | ArgTy[ArgIdx] = Args[ArgIdx]->getType(); |
| 1837 | if (ArgTy[ArgIdx]->isArrayType()) |
| 1838 | ArgTy[ArgIdx] = S.Context.getArrayDecayedType(ArgTy[ArgIdx]); |
| 1839 | } |
| 1840 | |
| 1841 | DeclarationName OpName = |
| 1842 | S.Context.DeclarationNames.getCXXLiteralOperatorName(UDSuffix); |
| 1843 | DeclarationNameInfo OpNameInfo(OpName, UDSuffixLoc); |
| 1844 | OpNameInfo.setCXXLiteralOperatorNameLoc(UDSuffixLoc); |
| 1845 | |
| 1846 | LookupResult R(S, OpName, UDSuffixLoc, Sema::LookupOrdinaryName); |
| 1847 | if (S.LookupLiteralOperator(Scope, R, llvm::ArrayRef(ArgTy, Args.size()), |
| 1848 | /*AllowRaw*/ false, /*AllowTemplate*/ false, |
| 1849 | /*AllowStringTemplatePack*/ false, |
| 1850 | /*DiagnoseMissing*/ true) == Sema::LOLR_Error) |
| 1851 | return ExprError(); |
| 1852 | |
| 1853 | return S.BuildLiteralOperatorCall(R, OpNameInfo, Args, LitEndLoc); |
| 1854 | } |
| 1855 | |
| 1856 | /// ActOnStringLiteral - The specified tokens were lexed as pasted string |
| 1857 | /// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string |
| 1858 | /// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from |
| 1859 | /// multiple tokens. However, the common case is that StringToks points to one |
| 1860 | /// string. |
| 1861 | /// |
| 1862 | ExprResult |
| 1863 | Sema::ActOnStringLiteral(ArrayRef<Token> StringToks, Scope *UDLScope) { |
| 1864 | assert(!StringToks.empty() && "Must have at least one string!")(static_cast <bool> (!StringToks.empty() && "Must have at least one string!" ) ? void (0) : __assert_fail ("!StringToks.empty() && \"Must have at least one string!\"" , "clang/lib/Sema/SemaExpr.cpp", 1864, __extension__ __PRETTY_FUNCTION__ )); |
| 1865 | |
| 1866 | StringLiteralParser Literal(StringToks, PP); |
| 1867 | if (Literal.hadError) |
| 1868 | return ExprError(); |
| 1869 | |
| 1870 | SmallVector<SourceLocation, 4> StringTokLocs; |
| 1871 | for (const Token &Tok : StringToks) |
| 1872 | StringTokLocs.push_back(Tok.getLocation()); |
| 1873 | |
| 1874 | QualType CharTy = Context.CharTy; |
| 1875 | StringLiteral::StringKind Kind = StringLiteral::Ordinary; |
| 1876 | if (Literal.isWide()) { |
| 1877 | CharTy = Context.getWideCharType(); |
| 1878 | Kind = StringLiteral::Wide; |
| 1879 | } else if (Literal.isUTF8()) { |
| 1880 | if (getLangOpts().Char8) |
| 1881 | CharTy = Context.Char8Ty; |
| 1882 | Kind = StringLiteral::UTF8; |
| 1883 | } else if (Literal.isUTF16()) { |
| 1884 | CharTy = Context.Char16Ty; |
| 1885 | Kind = StringLiteral::UTF16; |
| 1886 | } else if (Literal.isUTF32()) { |
| 1887 | CharTy = Context.Char32Ty; |
| 1888 | Kind = StringLiteral::UTF32; |
| 1889 | } else if (Literal.isPascal()) { |
| 1890 | CharTy = Context.UnsignedCharTy; |
| 1891 | } |
| 1892 | |
| 1893 | // Warn on initializing an array of char from a u8 string literal; this |
| 1894 | // becomes ill-formed in C++2a. |
| 1895 | if (getLangOpts().CPlusPlus && !getLangOpts().CPlusPlus20 && |
| 1896 | !getLangOpts().Char8 && Kind == StringLiteral::UTF8) { |
| 1897 | Diag(StringTokLocs.front(), diag::warn_cxx20_compat_utf8_string); |
| 1898 | |
| 1899 | // Create removals for all 'u8' prefixes in the string literal(s). This |
| 1900 | // ensures C++2a compatibility (but may change the program behavior when |
| 1901 | // built by non-Clang compilers for which the execution character set is |
| 1902 | // not always UTF-8). |
| 1903 | auto RemovalDiag = PDiag(diag::note_cxx20_compat_utf8_string_remove_u8); |
| 1904 | SourceLocation RemovalDiagLoc; |
| 1905 | for (const Token &Tok : StringToks) { |
| 1906 | if (Tok.getKind() == tok::utf8_string_literal) { |
| 1907 | if (RemovalDiagLoc.isInvalid()) |
| 1908 | RemovalDiagLoc = Tok.getLocation(); |
| 1909 | RemovalDiag << FixItHint::CreateRemoval(CharSourceRange::getCharRange( |
| 1910 | Tok.getLocation(), |
| 1911 | Lexer::AdvanceToTokenCharacter(Tok.getLocation(), 2, |
| 1912 | getSourceManager(), getLangOpts()))); |
| 1913 | } |
| 1914 | } |
| 1915 | Diag(RemovalDiagLoc, RemovalDiag); |
| 1916 | } |
| 1917 | |
| 1918 | QualType StrTy = |
| 1919 | Context.getStringLiteralArrayType(CharTy, Literal.GetNumStringChars()); |
| 1920 | |
| 1921 | // Pass &StringTokLocs[0], StringTokLocs.size() to factory! |
| 1922 | StringLiteral *Lit = StringLiteral::Create(Context, Literal.GetString(), |
| 1923 | Kind, Literal.Pascal, StrTy, |
| 1924 | &StringTokLocs[0], |
| 1925 | StringTokLocs.size()); |
| 1926 | if (Literal.getUDSuffix().empty()) |
| 1927 | return Lit; |
| 1928 | |
| 1929 | // We're building a user-defined literal. |
| 1930 | IdentifierInfo *UDSuffix = &Context.Idents.get(Literal.getUDSuffix()); |
| 1931 | SourceLocation UDSuffixLoc = |
| 1932 | getUDSuffixLoc(*this, StringTokLocs[Literal.getUDSuffixToken()], |
| 1933 | Literal.getUDSuffixOffset()); |
| 1934 | |
| 1935 | // Make sure we're allowed user-defined literals here. |
| 1936 | if (!UDLScope) |
| 1937 | return ExprError(Diag(UDSuffixLoc, diag::err_invalid_string_udl)); |
| 1938 | |
| 1939 | // C++11 [lex.ext]p5: The literal L is treated as a call of the form |
| 1940 | // operator "" X (str, len) |
| 1941 | QualType SizeType = Context.getSizeType(); |
| 1942 | |
| 1943 | DeclarationName OpName = |
| 1944 | Context.DeclarationNames.getCXXLiteralOperatorName(UDSuffix); |
| 1945 | DeclarationNameInfo OpNameInfo(OpName, UDSuffixLoc); |
| 1946 | OpNameInfo.setCXXLiteralOperatorNameLoc(UDSuffixLoc); |
| 1947 | |
| 1948 | QualType ArgTy[] = { |
| 1949 | Context.getArrayDecayedType(StrTy), SizeType |
| 1950 | }; |
| 1951 | |
| 1952 | LookupResult R(*this, OpName, UDSuffixLoc, LookupOrdinaryName); |
| 1953 | switch (LookupLiteralOperator(UDLScope, R, ArgTy, |
| 1954 | /*AllowRaw*/ false, /*AllowTemplate*/ true, |
| 1955 | /*AllowStringTemplatePack*/ true, |
| 1956 | /*DiagnoseMissing*/ true, Lit)) { |
| 1957 | |
| 1958 | case LOLR_Cooked: { |
| 1959 | llvm::APInt Len(Context.getIntWidth(SizeType), Literal.GetNumStringChars()); |
| 1960 | IntegerLiteral *LenArg = IntegerLiteral::Create(Context, Len, SizeType, |
| 1961 | StringTokLocs[0]); |
| 1962 | Expr *Args[] = { Lit, LenArg }; |
| 1963 | |
| 1964 | return BuildLiteralOperatorCall(R, OpNameInfo, Args, StringTokLocs.back()); |
| 1965 | } |
| 1966 | |
| 1967 | case LOLR_Template: { |
| 1968 | TemplateArgumentListInfo ExplicitArgs; |
| 1969 | TemplateArgument Arg(Lit); |
| 1970 | TemplateArgumentLocInfo ArgInfo(Lit); |
| 1971 | ExplicitArgs.addArgument(TemplateArgumentLoc(Arg, ArgInfo)); |
| 1972 | return BuildLiteralOperatorCall(R, OpNameInfo, std::nullopt, |
| 1973 | StringTokLocs.back(), &ExplicitArgs); |
| 1974 | } |
| 1975 | |
| 1976 | case LOLR_StringTemplatePack: { |
| 1977 | TemplateArgumentListInfo ExplicitArgs; |
| 1978 | |
| 1979 | unsigned CharBits = Context.getIntWidth(CharTy); |
| 1980 | bool CharIsUnsigned = CharTy->isUnsignedIntegerType(); |
| 1981 | llvm::APSInt Value(CharBits, CharIsUnsigned); |
| 1982 | |
| 1983 | TemplateArgument TypeArg(CharTy); |
| 1984 | TemplateArgumentLocInfo TypeArgInfo(Context.getTrivialTypeSourceInfo(CharTy)); |
| 1985 | ExplicitArgs.addArgument(TemplateArgumentLoc(TypeArg, TypeArgInfo)); |
| 1986 | |
| 1987 | for (unsigned I = 0, N = Lit->getLength(); I != N; ++I) { |
| 1988 | Value = Lit->getCodeUnit(I); |
| 1989 | TemplateArgument Arg(Context, Value, CharTy); |
| 1990 | TemplateArgumentLocInfo ArgInfo; |
| 1991 | ExplicitArgs.addArgument(TemplateArgumentLoc(Arg, ArgInfo)); |
| 1992 | } |
| 1993 | return BuildLiteralOperatorCall(R, OpNameInfo, std::nullopt, |
| 1994 | StringTokLocs.back(), &ExplicitArgs); |
| 1995 | } |
| 1996 | case LOLR_Raw: |
| 1997 | case LOLR_ErrorNoDiagnostic: |
| 1998 | llvm_unreachable("unexpected literal operator lookup result")::llvm::llvm_unreachable_internal("unexpected literal operator lookup result" , "clang/lib/Sema/SemaExpr.cpp", 1998); |
| 1999 | case LOLR_Error: |
| 2000 | return ExprError(); |
| 2001 | } |
| 2002 | llvm_unreachable("unexpected literal operator lookup result")::llvm::llvm_unreachable_internal("unexpected literal operator lookup result" , "clang/lib/Sema/SemaExpr.cpp", 2002); |
| 2003 | } |
| 2004 | |
| 2005 | DeclRefExpr * |
| 2006 | Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK, |
| 2007 | SourceLocation Loc, |
| 2008 | const CXXScopeSpec *SS) { |
| 2009 | DeclarationNameInfo NameInfo(D->getDeclName(), Loc); |
| 2010 | return BuildDeclRefExpr(D, Ty, VK, NameInfo, SS); |
| 2011 | } |
| 2012 | |
| 2013 | DeclRefExpr * |
| 2014 | Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK, |
| 2015 | const DeclarationNameInfo &NameInfo, |
| 2016 | const CXXScopeSpec *SS, NamedDecl *FoundD, |
| 2017 | SourceLocation TemplateKWLoc, |
| 2018 | const TemplateArgumentListInfo *TemplateArgs) { |
| 2019 | NestedNameSpecifierLoc NNS = |
| 2020 | SS ? SS->getWithLocInContext(Context) : NestedNameSpecifierLoc(); |
| 2021 | return BuildDeclRefExpr(D, Ty, VK, NameInfo, NNS, FoundD, TemplateKWLoc, |
| 2022 | TemplateArgs); |
| 2023 | } |
| 2024 | |
| 2025 | // CUDA/HIP: Check whether a captured reference variable is referencing a |
| 2026 | // host variable in a device or host device lambda. |
| 2027 | static bool isCapturingReferenceToHostVarInCUDADeviceLambda(const Sema &S, |
| 2028 | VarDecl *VD) { |
| 2029 | if (!S.getLangOpts().CUDA || !VD->hasInit()) |
| 2030 | return false; |
| 2031 | assert(VD->getType()->isReferenceType())(static_cast <bool> (VD->getType()->isReferenceType ()) ? void (0) : __assert_fail ("VD->getType()->isReferenceType()" , "clang/lib/Sema/SemaExpr.cpp", 2031, __extension__ __PRETTY_FUNCTION__ )); |
| 2032 | |
| 2033 | // Check whether the reference variable is referencing a host variable. |
| 2034 | auto *DRE = dyn_cast<DeclRefExpr>(VD->getInit()); |
| 2035 | if (!DRE) |
| 2036 | return false; |
| 2037 | auto *Referee = dyn_cast<VarDecl>(DRE->getDecl()); |
| 2038 | if (!Referee || !Referee->hasGlobalStorage() || |
| 2039 | Referee->hasAttr<CUDADeviceAttr>()) |
| 2040 | return false; |
| 2041 | |
| 2042 | // Check whether the current function is a device or host device lambda. |
| 2043 | // Check whether the reference variable is a capture by getDeclContext() |
| 2044 | // since refersToEnclosingVariableOrCapture() is not ready at this point. |
| 2045 | auto *MD = dyn_cast_or_null<CXXMethodDecl>(S.CurContext); |
| 2046 | if (MD && MD->getParent()->isLambda() && |
| 2047 | MD->getOverloadedOperator() == OO_Call && MD->hasAttr<CUDADeviceAttr>() && |
| 2048 | VD->getDeclContext() != MD) |
| 2049 | return true; |
| 2050 | |
| 2051 | return false; |
| 2052 | } |
| 2053 | |
| 2054 | NonOdrUseReason Sema::getNonOdrUseReasonInCurrentContext(ValueDecl *D) { |
| 2055 | // A declaration named in an unevaluated operand never constitutes an odr-use. |
| 2056 | if (isUnevaluatedContext()) |
| 2057 | return NOUR_Unevaluated; |
| 2058 | |
| 2059 | // C++2a [basic.def.odr]p4: |
| 2060 | // A variable x whose name appears as a potentially-evaluated expression e |
| 2061 | // is odr-used by e unless [...] x is a reference that is usable in |
| 2062 | // constant expressions. |
| 2063 | // CUDA/HIP: |
| 2064 | // If a reference variable referencing a host variable is captured in a |
| 2065 | // device or host device lambda, the value of the referee must be copied |
| 2066 | // to the capture and the reference variable must be treated as odr-use |
| 2067 | // since the value of the referee is not known at compile time and must |
| 2068 | // be loaded from the captured. |
| 2069 | if (VarDecl *VD = dyn_cast<VarDecl>(D)) { |
| 2070 | if (VD->getType()->isReferenceType() && |
| 2071 | !(getLangOpts().OpenMP && isOpenMPCapturedDecl(D)) && |
| 2072 | !isCapturingReferenceToHostVarInCUDADeviceLambda(*this, VD) && |
| 2073 | VD->isUsableInConstantExpressions(Context)) |
| 2074 | return NOUR_Constant; |
| 2075 | } |
| 2076 | |
| 2077 | // All remaining non-variable cases constitute an odr-use. For variables, we |
| 2078 | // need to wait and see how the expression is used. |
| 2079 | return NOUR_None; |
| 2080 | } |
| 2081 | |
| 2082 | /// BuildDeclRefExpr - Build an expression that references a |
| 2083 | /// declaration that does not require a closure capture. |
| 2084 | DeclRefExpr * |
| 2085 | Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK, |
| 2086 | const DeclarationNameInfo &NameInfo, |
| 2087 | NestedNameSpecifierLoc NNS, NamedDecl *FoundD, |
| 2088 | SourceLocation TemplateKWLoc, |
| 2089 | const TemplateArgumentListInfo *TemplateArgs) { |
| 2090 | bool RefersToCapturedVariable = isa<VarDecl, BindingDecl>(D) && |
| 2091 | NeedToCaptureVariable(D, NameInfo.getLoc()); |
| 2092 | |
| 2093 | DeclRefExpr *E = DeclRefExpr::Create( |
| 2094 | Context, NNS, TemplateKWLoc, D, RefersToCapturedVariable, NameInfo, Ty, |
| 2095 | VK, FoundD, TemplateArgs, getNonOdrUseReasonInCurrentContext(D)); |
| 2096 | MarkDeclRefReferenced(E); |
| 2097 | |
| 2098 | // C++ [except.spec]p17: |
| 2099 | // An exception-specification is considered to be needed when: |
| 2100 | // - in an expression, the function is the unique lookup result or |
| 2101 | // the selected member of a set of overloaded functions. |
| 2102 | // |
| 2103 | // We delay doing this until after we've built the function reference and |
| 2104 | // marked it as used so that: |
| 2105 | // a) if the function is defaulted, we get errors from defining it before / |
| 2106 | // instead of errors from computing its exception specification, and |
| 2107 | // b) if the function is a defaulted comparison, we can use the body we |
| 2108 | // build when defining it as input to the exception specification |
| 2109 | // computation rather than computing a new body. |
| 2110 | if (auto *FPT = Ty->getAs<FunctionProtoType>()) { |
| 2111 | if (isUnresolvedExceptionSpec(FPT->getExceptionSpecType())) { |
| 2112 | if (auto *NewFPT = ResolveExceptionSpec(NameInfo.getLoc(), FPT)) |
| 2113 | E->setType(Context.getQualifiedType(NewFPT, Ty.getQualifiers())); |
| 2114 | } |
| 2115 | } |
| 2116 | |
| 2117 | if (getLangOpts().ObjCWeak && isa<VarDecl>(D) && |
| 2118 | Ty.getObjCLifetime() == Qualifiers::OCL_Weak && !isUnevaluatedContext() && |
| 2119 | !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, E->getBeginLoc())) |
| 2120 | getCurFunction()->recordUseOfWeak(E); |
| 2121 | |
| 2122 | FieldDecl *FD = dyn_cast<FieldDecl>(D); |
| 2123 | if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(D)) |
| 2124 | FD = IFD->getAnonField(); |
| 2125 | if (FD) { |
| 2126 | UnusedPrivateFields.remove(FD); |
| 2127 | // Just in case we're building an illegal pointer-to-member. |
| 2128 | if (FD->isBitField()) |
| 2129 | E->setObjectKind(OK_BitField); |
| 2130 | } |
| 2131 | |
| 2132 | // C++ [expr.prim]/8: The expression [...] is a bit-field if the identifier |
| 2133 | // designates a bit-field. |
| 2134 | if (auto *BD = dyn_cast<BindingDecl>(D)) |
| 2135 | if (auto *BE = BD->getBinding()) |
| 2136 | E->setObjectKind(BE->getObjectKind()); |
| 2137 | |
| 2138 | return E; |
| 2139 | } |
| 2140 | |
| 2141 | /// Decomposes the given name into a DeclarationNameInfo, its location, and |
| 2142 | /// possibly a list of template arguments. |
| 2143 | /// |
| 2144 | /// If this produces template arguments, it is permitted to call |
| 2145 | /// DecomposeTemplateName. |
| 2146 | /// |
| 2147 | /// This actually loses a lot of source location information for |
| 2148 | /// non-standard name kinds; we should consider preserving that in |
| 2149 | /// some way. |
| 2150 | void |
| 2151 | Sema::DecomposeUnqualifiedId(const UnqualifiedId &Id, |
| 2152 | TemplateArgumentListInfo &Buffer, |
| 2153 | DeclarationNameInfo &NameInfo, |
| 2154 | const TemplateArgumentListInfo *&TemplateArgs) { |
| 2155 | if (Id.getKind() == UnqualifiedIdKind::IK_TemplateId) { |
| 2156 | Buffer.setLAngleLoc(Id.TemplateId->LAngleLoc); |
| 2157 | Buffer.setRAngleLoc(Id.TemplateId->RAngleLoc); |
| 2158 | |
| 2159 | ASTTemplateArgsPtr TemplateArgsPtr(Id.TemplateId->getTemplateArgs(), |
| 2160 | Id.TemplateId->NumArgs); |
| 2161 | translateTemplateArguments(TemplateArgsPtr, Buffer); |
| 2162 | |
| 2163 | TemplateName TName = Id.TemplateId->Template.get(); |
| 2164 | SourceLocation TNameLoc = Id.TemplateId->TemplateNameLoc; |
| 2165 | NameInfo = Context.getNameForTemplate(TName, TNameLoc); |
| 2166 | TemplateArgs = &Buffer; |
| 2167 | } else { |
| 2168 | NameInfo = GetNameFromUnqualifiedId(Id); |
| 2169 | TemplateArgs = nullptr; |
| 2170 | } |
| 2171 | } |
| 2172 | |
| 2173 | static void emitEmptyLookupTypoDiagnostic( |
| 2174 | const TypoCorrection &TC, Sema &SemaRef, const CXXScopeSpec &SS, |
| 2175 | DeclarationName Typo, SourceLocation TypoLoc, ArrayRef<Expr *> Args, |
| 2176 | unsigned DiagnosticID, unsigned DiagnosticSuggestID) { |
| 2177 | DeclContext *Ctx = |
| 2178 | SS.isEmpty() ? nullptr : SemaRef.computeDeclContext(SS, false); |
| 2179 | if (!TC) { |
| 2180 | // Emit a special diagnostic for failed member lookups. |
| 2181 | // FIXME: computing the declaration context might fail here (?) |
| 2182 | if (Ctx) |
| 2183 | SemaRef.Diag(TypoLoc, diag::err_no_member) << Typo << Ctx |
| 2184 | << SS.getRange(); |
| 2185 | else |
| 2186 | SemaRef.Diag(TypoLoc, DiagnosticID) << Typo; |
| 2187 | return; |
| 2188 | } |
| 2189 | |
| 2190 | std::string CorrectedStr = TC.getAsString(SemaRef.getLangOpts()); |
| 2191 | bool DroppedSpecifier = |
| 2192 | TC.WillReplaceSpecifier() && Typo.getAsString() == CorrectedStr; |
| 2193 | unsigned NoteID = TC.getCorrectionDeclAs<ImplicitParamDecl>() |
| 2194 | ? diag::note_implicit_param_decl |
| 2195 | : diag::note_previous_decl; |
| 2196 | if (!Ctx) |
| 2197 | SemaRef.diagnoseTypo(TC, SemaRef.PDiag(DiagnosticSuggestID) << Typo, |
| 2198 | SemaRef.PDiag(NoteID)); |
| 2199 | else |
| 2200 | SemaRef.diagnoseTypo(TC, SemaRef.PDiag(diag::err_no_member_suggest) |
| 2201 | << Typo << Ctx << DroppedSpecifier |
| 2202 | << SS.getRange(), |
| 2203 | SemaRef.PDiag(NoteID)); |
| 2204 | } |
| 2205 | |
| 2206 | /// Diagnose a lookup that found results in an enclosing class during error |
| 2207 | /// recovery. This usually indicates that the results were found in a dependent |
| 2208 | /// base class that could not be searched as part of a template definition. |
| 2209 | /// Always issues a diagnostic (though this may be only a warning in MS |
| 2210 | /// compatibility mode). |
| 2211 | /// |
| 2212 | /// Return \c true if the error is unrecoverable, or \c false if the caller |
| 2213 | /// should attempt to recover using these lookup results. |
| 2214 | bool Sema::DiagnoseDependentMemberLookup(LookupResult &R) { |
| 2215 | // During a default argument instantiation the CurContext points |
| 2216 | // to a CXXMethodDecl; but we can't apply a this-> fixit inside a |
| 2217 | // function parameter list, hence add an explicit check. |
| 2218 | bool isDefaultArgument = |
| 2219 | !CodeSynthesisContexts.empty() && |
| 2220 | CodeSynthesisContexts.back().Kind == |
| 2221 | CodeSynthesisContext::DefaultFunctionArgumentInstantiation; |
| 2222 | CXXMethodDecl *CurMethod = dyn_cast<CXXMethodDecl>(CurContext); |
| 2223 | bool isInstance = CurMethod && CurMethod->isInstance() && |
| 2224 | R.getNamingClass() == CurMethod->getParent() && |
| 2225 | !isDefaultArgument; |
| 2226 | |
| 2227 | // There are two ways we can find a class-scope declaration during template |
| 2228 | // instantiation that we did not find in the template definition: if it is a |
| 2229 | // member of a dependent base class, or if it is declared after the point of |
| 2230 | // use in the same class. Distinguish these by comparing the class in which |
| 2231 | // the member was found to the naming class of the lookup. |
| 2232 | unsigned DiagID = diag::err_found_in_dependent_base; |
| 2233 | unsigned NoteID = diag::note_member_declared_at; |
| 2234 | if (R.getRepresentativeDecl()->getDeclContext()->Equals(R.getNamingClass())) { |
| 2235 | DiagID = getLangOpts().MSVCCompat ? diag::ext_found_later_in_class |
| 2236 | : diag::err_found_later_in_class; |
| 2237 | } else if (getLangOpts().MSVCCompat) { |
| 2238 | DiagID = diag::ext_found_in_dependent_base; |
| 2239 | NoteID = diag::note_dependent_member_use; |
| 2240 | } |
| 2241 | |
| 2242 | if (isInstance) { |
| 2243 | // Give a code modification hint to insert 'this->'. |
| 2244 | Diag(R.getNameLoc(), DiagID) |
| 2245 | << R.getLookupName() |
| 2246 | << FixItHint::CreateInsertion(R.getNameLoc(), "this->"); |
| 2247 | CheckCXXThisCapture(R.getNameLoc()); |
| 2248 | } else { |
| 2249 | // FIXME: Add a FixItHint to insert 'Base::' or 'Derived::' (assuming |
| 2250 | // they're not shadowed). |
| 2251 | Diag(R.getNameLoc(), DiagID) << R.getLookupName(); |
| 2252 | } |
| 2253 | |
| 2254 | for (NamedDecl *D : R) |
| 2255 | Diag(D->getLocation(), NoteID); |
| 2256 | |
| 2257 | // Return true if we are inside a default argument instantiation |
| 2258 | // and the found name refers to an instance member function, otherwise |
| 2259 | // the caller will try to create an implicit member call and this is wrong |
| 2260 | // for default arguments. |
| 2261 | // |
| 2262 | // FIXME: Is this special case necessary? We could allow the caller to |
| 2263 | // diagnose this. |
| 2264 | if (isDefaultArgument && ((*R.begin())->isCXXInstanceMember())) { |
| 2265 | Diag(R.getNameLoc(), diag::err_member_call_without_object); |
| 2266 | return true; |
| 2267 | } |
| 2268 | |
| 2269 | // Tell the callee to try to recover. |
| 2270 | return false; |
| 2271 | } |
| 2272 | |
| 2273 | /// Diagnose an empty lookup. |
| 2274 | /// |
| 2275 | /// \return false if new lookup candidates were found |
| 2276 | bool Sema::DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R, |
| 2277 | CorrectionCandidateCallback &CCC, |
| 2278 | TemplateArgumentListInfo *ExplicitTemplateArgs, |
| 2279 | ArrayRef<Expr *> Args, TypoExpr **Out) { |
| 2280 | DeclarationName Name = R.getLookupName(); |
| 2281 | |
| 2282 | unsigned diagnostic = diag::err_undeclared_var_use; |
| 2283 | unsigned diagnostic_suggest = diag::err_undeclared_var_use_suggest; |
| 2284 | if (Name.getNameKind() == DeclarationName::CXXOperatorName || |
| 2285 | Name.getNameKind() == DeclarationName::CXXLiteralOperatorName || |
| 2286 | Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { |
| 2287 | diagnostic = diag::err_undeclared_use; |
| 2288 | diagnostic_suggest = diag::err_undeclared_use_suggest; |
| 2289 | } |
| 2290 | |
| 2291 | // If the original lookup was an unqualified lookup, fake an |
| 2292 | // unqualified lookup. This is useful when (for example) the |
| 2293 | // original lookup would not have found something because it was a |
| 2294 | // dependent name. |
| 2295 | DeclContext *DC = SS.isEmpty() ? CurContext : nullptr; |
| 2296 | while (DC) { |
| 2297 | if (isa<CXXRecordDecl>(DC)) { |
| 2298 | LookupQualifiedName(R, DC); |
| 2299 | |
| 2300 | if (!R.empty()) { |
| 2301 | // Don't give errors about ambiguities in this lookup. |
| 2302 | R.suppressDiagnostics(); |
| 2303 | |
| 2304 | // If there's a best viable function among the results, only mention |
| 2305 | // that one in the notes. |
| 2306 | OverloadCandidateSet Candidates(R.getNameLoc(), |
| 2307 | OverloadCandidateSet::CSK_Normal); |
| 2308 | AddOverloadedCallCandidates(R, ExplicitTemplateArgs, Args, Candidates); |
| 2309 | OverloadCandidateSet::iterator Best; |
| 2310 | if (Candidates.BestViableFunction(*this, R.getNameLoc(), Best) == |
| 2311 | OR_Success) { |
| 2312 | R.clear(); |
| 2313 | R.addDecl(Best->FoundDecl.getDecl(), Best->FoundDecl.getAccess()); |
| 2314 | R.resolveKind(); |
| 2315 | } |
| 2316 | |
| 2317 | return DiagnoseDependentMemberLookup(R); |
| 2318 | } |
| 2319 | |
| 2320 | R.clear(); |
| 2321 | } |
| 2322 | |
| 2323 | DC = DC->getLookupParent(); |
| 2324 | } |
| 2325 | |
| 2326 | // We didn't find anything, so try to correct for a typo. |
| 2327 | TypoCorrection Corrected; |
| 2328 | if (S && Out) { |
| 2329 | SourceLocation TypoLoc = R.getNameLoc(); |
| 2330 | assert(!ExplicitTemplateArgs &&(static_cast <bool> (!ExplicitTemplateArgs && "Diagnosing an empty lookup with explicit template args!" ) ? void (0) : __assert_fail ("!ExplicitTemplateArgs && \"Diagnosing an empty lookup with explicit template args!\"" , "clang/lib/Sema/SemaExpr.cpp", 2331, __extension__ __PRETTY_FUNCTION__ )) |
| 2331 | "Diagnosing an empty lookup with explicit template args!")(static_cast <bool> (!ExplicitTemplateArgs && "Diagnosing an empty lookup with explicit template args!" ) ? void (0) : __assert_fail ("!ExplicitTemplateArgs && \"Diagnosing an empty lookup with explicit template args!\"" , "clang/lib/Sema/SemaExpr.cpp", 2331, __extension__ __PRETTY_FUNCTION__ )); |
| 2332 | *Out = CorrectTypoDelayed( |
| 2333 | R.getLookupNameInfo(), R.getLookupKind(), S, &SS, CCC, |
| 2334 | [=](const TypoCorrection &TC) { |
| 2335 | emitEmptyLookupTypoDiagnostic(TC, *this, SS, Name, TypoLoc, Args, |
| 2336 | diagnostic, diagnostic_suggest); |
| 2337 | }, |
| 2338 | nullptr, CTK_ErrorRecovery); |
| 2339 | if (*Out) |
| 2340 | return true; |
| 2341 | } else if (S && |
| 2342 | (Corrected = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), |
| 2343 | S, &SS, CCC, CTK_ErrorRecovery))) { |
| 2344 | std::string CorrectedStr(Corrected.getAsString(getLangOpts())); |
| 2345 | bool DroppedSpecifier = |
| 2346 | Corrected.WillReplaceSpecifier() && Name.getAsString() == CorrectedStr; |
| 2347 | R.setLookupName(Corrected.getCorrection()); |
| 2348 | |
| 2349 | bool AcceptableWithRecovery = false; |
| 2350 | bool AcceptableWithoutRecovery = false; |
| 2351 | NamedDecl *ND = Corrected.getFoundDecl(); |
| 2352 | if (ND) { |
| 2353 | if (Corrected.isOverloaded()) { |
| 2354 | OverloadCandidateSet OCS(R.getNameLoc(), |
| 2355 | OverloadCandidateSet::CSK_Normal); |
| 2356 | OverloadCandidateSet::iterator Best; |
| 2357 | for (NamedDecl *CD : Corrected) { |
| 2358 | if (FunctionTemplateDecl *FTD = |
| 2359 | dyn_cast<FunctionTemplateDecl>(CD)) |
| 2360 | AddTemplateOverloadCandidate( |
| 2361 | FTD, DeclAccessPair::make(FTD, AS_none), ExplicitTemplateArgs, |
| 2362 | Args, OCS); |
| 2363 | else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(CD)) |
| 2364 | if (!ExplicitTemplateArgs || ExplicitTemplateArgs->size() == 0) |
| 2365 | AddOverloadCandidate(FD, DeclAccessPair::make(FD, AS_none), |
| 2366 | Args, OCS); |
| 2367 | } |
| 2368 | switch (OCS.BestViableFunction(*this, R.getNameLoc(), Best)) { |
| 2369 | case OR_Success: |
| 2370 | ND = Best->FoundDecl; |
| 2371 | Corrected.setCorrectionDecl(ND); |
| 2372 | break; |
| 2373 | default: |
| 2374 | // FIXME: Arbitrarily pick the first declaration for the note. |
| 2375 | Corrected.setCorrectionDecl(ND); |
| 2376 | break; |
| 2377 | } |
| 2378 | } |
| 2379 | R.addDecl(ND); |
| 2380 | if (getLangOpts().CPlusPlus && ND->isCXXClassMember()) { |
| 2381 | CXXRecordDecl *Record = nullptr; |
| 2382 | if (Corrected.getCorrectionSpecifier()) { |
| 2383 | const Type *Ty = Corrected.getCorrectionSpecifier()->getAsType(); |
| 2384 | Record = Ty->getAsCXXRecordDecl(); |
| 2385 | } |
| 2386 | if (!Record) |
| 2387 | Record = cast<CXXRecordDecl>( |
| 2388 | ND->getDeclContext()->getRedeclContext()); |
| 2389 | R.setNamingClass(Record); |
| 2390 | } |
| 2391 | |
| 2392 | auto *UnderlyingND = ND->getUnderlyingDecl(); |
| 2393 | AcceptableWithRecovery = isa<ValueDecl>(UnderlyingND) || |
| 2394 | isa<FunctionTemplateDecl>(UnderlyingND); |
| 2395 | // FIXME: If we ended up with a typo for a type name or |
| 2396 | // Objective-C class name, we're in trouble because the parser |
| 2397 | // is in the wrong place to recover. Suggest the typo |
| 2398 | // correction, but don't make it a fix-it since we're not going |
| 2399 | // to recover well anyway. |
| 2400 | AcceptableWithoutRecovery = isa<TypeDecl>(UnderlyingND) || |
| 2401 | getAsTypeTemplateDecl(UnderlyingND) || |
| 2402 | isa<ObjCInterfaceDecl>(UnderlyingND); |
| 2403 | } else { |
| 2404 | // FIXME: We found a keyword. Suggest it, but don't provide a fix-it |
| 2405 | // because we aren't able to recover. |
| 2406 | AcceptableWithoutRecovery = true; |
| 2407 | } |
| 2408 | |
| 2409 | if (AcceptableWithRecovery || AcceptableWithoutRecovery) { |
| 2410 | unsigned NoteID = Corrected.getCorrectionDeclAs<ImplicitParamDecl>() |
| 2411 | ? diag::note_implicit_param_decl |
| 2412 | : diag::note_previous_decl; |
| 2413 | if (SS.isEmpty()) |
| 2414 | diagnoseTypo(Corrected, PDiag(diagnostic_suggest) << Name, |
| 2415 | PDiag(NoteID), AcceptableWithRecovery); |
| 2416 | else |
| 2417 | diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest) |
| 2418 | << Name << computeDeclContext(SS, false) |
| 2419 | << DroppedSpecifier << SS.getRange(), |
| 2420 | PDiag(NoteID), AcceptableWithRecovery); |
| 2421 | |
| 2422 | // Tell the callee whether to try to recover. |
| 2423 | return !AcceptableWithRecovery; |
| 2424 | } |
| 2425 | } |
| 2426 | R.clear(); |
| 2427 | |
| 2428 | // Emit a special diagnostic for failed member lookups. |
| 2429 | // FIXME: computing the declaration context might fail here (?) |
| 2430 | if (!SS.isEmpty()) { |
| 2431 | Diag(R.getNameLoc(), diag::err_no_member) |
| 2432 | << Name << computeDeclContext(SS, false) |
| 2433 | << SS.getRange(); |
| 2434 | return true; |
| 2435 | } |
| 2436 | |
| 2437 | // Give up, we can't recover. |
| 2438 | Diag(R.getNameLoc(), diagnostic) << Name; |
| 2439 | return true; |
| 2440 | } |
| 2441 | |
| 2442 | /// In Microsoft mode, if we are inside a template class whose parent class has |
| 2443 | /// dependent base classes, and we can't resolve an unqualified identifier, then |
| 2444 | /// assume the identifier is a member of a dependent base class. We can only |
| 2445 | /// recover successfully in static methods, instance methods, and other contexts |
| 2446 | /// where 'this' is available. This doesn't precisely match MSVC's |
| 2447 | /// instantiation model, but it's close enough. |
| 2448 | static Expr * |
| 2449 | recoverFromMSUnqualifiedLookup(Sema &S, ASTContext &Context, |
| 2450 | DeclarationNameInfo &NameInfo, |
| 2451 | SourceLocation TemplateKWLoc, |
| 2452 | const TemplateArgumentListInfo *TemplateArgs) { |
| 2453 | // Only try to recover from lookup into dependent bases in static methods or |
| 2454 | // contexts where 'this' is available. |
| 2455 | QualType ThisType = S.getCurrentThisType(); |
| 2456 | const CXXRecordDecl *RD = nullptr; |
| 2457 | if (!ThisType.isNull()) |
| 2458 | RD = ThisType->getPointeeType()->getAsCXXRecordDecl(); |
| 2459 | else if (auto *MD = dyn_cast<CXXMethodDecl>(S.CurContext)) |
| 2460 | RD = MD->getParent(); |
| 2461 | if (!RD || !RD->hasAnyDependentBases()) |
| 2462 | return nullptr; |
| 2463 | |
| 2464 | // Diagnose this as unqualified lookup into a dependent base class. If 'this' |
| 2465 | // is available, suggest inserting 'this->' as a fixit. |
| 2466 | SourceLocation Loc = NameInfo.getLoc(); |
| 2467 | auto DB = S.Diag(Loc, diag::ext_undeclared_unqual_id_with_dependent_base); |
| 2468 | DB << NameInfo.getName() << RD; |
| 2469 | |
| 2470 | if (!ThisType.isNull()) { |
| 2471 | DB << FixItHint::CreateInsertion(Loc, "this->"); |
| 2472 | return CXXDependentScopeMemberExpr::Create( |
| 2473 | Context, /*This=*/nullptr, ThisType, /*IsArrow=*/true, |
| 2474 | /*Op=*/SourceLocation(), NestedNameSpecifierLoc(), TemplateKWLoc, |
| 2475 | /*FirstQualifierFoundInScope=*/nullptr, NameInfo, TemplateArgs); |
| 2476 | } |
| 2477 | |
| 2478 | // Synthesize a fake NNS that points to the derived class. This will |
| 2479 | // perform name lookup during template instantiation. |
| 2480 | CXXScopeSpec SS; |
| 2481 | auto *NNS = |
| 2482 | NestedNameSpecifier::Create(Context, nullptr, true, RD->getTypeForDecl()); |
| 2483 | SS.MakeTrivial(Context, NNS, SourceRange(Loc, Loc)); |
| 2484 | return DependentScopeDeclRefExpr::Create( |
| 2485 | Context, SS.getWithLocInContext(Context), TemplateKWLoc, NameInfo, |
| 2486 | TemplateArgs); |
| 2487 | } |
| 2488 | |
| 2489 | ExprResult |
| 2490 | Sema::ActOnIdExpression(Scope *S, CXXScopeSpec &SS, |
| 2491 | SourceLocation TemplateKWLoc, UnqualifiedId &Id, |
| 2492 | bool HasTrailingLParen, bool IsAddressOfOperand, |
| 2493 | CorrectionCandidateCallback *CCC, |
| 2494 | bool IsInlineAsmIdentifier, Token *KeywordReplacement) { |
| 2495 | assert(!(IsAddressOfOperand && HasTrailingLParen) &&(static_cast <bool> (!(IsAddressOfOperand && HasTrailingLParen ) && "cannot be direct & operand and have a trailing lparen" ) ? void (0) : __assert_fail ("!(IsAddressOfOperand && HasTrailingLParen) && \"cannot be direct & operand and have a trailing lparen\"" , "clang/lib/Sema/SemaExpr.cpp", 2496, __extension__ __PRETTY_FUNCTION__ )) |
| 2496 | "cannot be direct & operand and have a trailing lparen")(static_cast <bool> (!(IsAddressOfOperand && HasTrailingLParen ) && "cannot be direct & operand and have a trailing lparen" ) ? void (0) : __assert_fail ("!(IsAddressOfOperand && HasTrailingLParen) && \"cannot be direct & operand and have a trailing lparen\"" , "clang/lib/Sema/SemaExpr.cpp", 2496, __extension__ __PRETTY_FUNCTION__ )); |
| 2497 | if (SS.isInvalid()) |
| 2498 | return ExprError(); |
| 2499 | |
| 2500 | TemplateArgumentListInfo TemplateArgsBuffer; |
| 2501 | |
| 2502 | // Decompose the UnqualifiedId into the following data. |
| 2503 | DeclarationNameInfo NameInfo; |
| 2504 | const TemplateArgumentListInfo *TemplateArgs; |
| 2505 | DecomposeUnqualifiedId(Id, TemplateArgsBuffer, NameInfo, TemplateArgs); |
| 2506 | |
| 2507 | DeclarationName Name = NameInfo.getName(); |
| 2508 | IdentifierInfo *II = Name.getAsIdentifierInfo(); |
| 2509 | SourceLocation NameLoc = NameInfo.getLoc(); |
| 2510 | |
| 2511 | if (II && II->isEditorPlaceholder()) { |
| 2512 | // FIXME: When typed placeholders are supported we can create a typed |
| 2513 | // placeholder expression node. |
| 2514 | return ExprError(); |
| 2515 | } |
| 2516 | |
| 2517 | // C++ [temp.dep.expr]p3: |
| 2518 | // An id-expression is type-dependent if it contains: |
| 2519 | // -- an identifier that was declared with a dependent type, |
| 2520 | // (note: handled after lookup) |
| 2521 | // -- a template-id that is dependent, |
| 2522 | // (note: handled in BuildTemplateIdExpr) |
| 2523 | // -- a conversion-function-id that specifies a dependent type, |
| 2524 | // -- a nested-name-specifier that contains a class-name that |
| 2525 | // names a dependent type. |
| 2526 | // Determine whether this is a member of an unknown specialization; |
| 2527 | // we need to handle these differently. |
| 2528 | bool DependentID = false; |
| 2529 | if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && |
| 2530 | Name.getCXXNameType()->isDependentType()) { |
| 2531 | DependentID = true; |
| 2532 | } else if (SS.isSet()) { |
| 2533 | if (DeclContext *DC = computeDeclContext(SS, false)) { |
| 2534 | if (RequireCompleteDeclContext(SS, DC)) |
| 2535 | return ExprError(); |
| 2536 | } else { |
| 2537 | DependentID = true; |
| 2538 | } |
| 2539 | } |
| 2540 | |
| 2541 | if (DependentID) |
| 2542 | return ActOnDependentIdExpression(SS, TemplateKWLoc, NameInfo, |
| 2543 | IsAddressOfOperand, TemplateArgs); |
| 2544 | |
| 2545 | // Perform the required lookup. |
| 2546 | LookupResult R(*this, NameInfo, |
| 2547 | (Id.getKind() == UnqualifiedIdKind::IK_ImplicitSelfParam) |
| 2548 | ? LookupObjCImplicitSelfParam |
| 2549 | : LookupOrdinaryName); |
| 2550 | if (TemplateKWLoc.isValid() || TemplateArgs) { |
| 2551 | // Lookup the template name again to correctly establish the context in |
| 2552 | // which it was found. This is really unfortunate as we already did the |
| 2553 | // lookup to determine that it was a template name in the first place. If |
| 2554 | // this becomes a performance hit, we can work harder to preserve those |
| 2555 | // results until we get here but it's likely not worth it. |
| 2556 | bool MemberOfUnknownSpecialization; |
| 2557 | AssumedTemplateKind AssumedTemplate; |
| 2558 | if (LookupTemplateName(R, S, SS, QualType(), /*EnteringContext=*/false, |
| 2559 | MemberOfUnknownSpecialization, TemplateKWLoc, |
| 2560 | &AssumedTemplate)) |
| 2561 | return ExprError(); |
| 2562 | |
| 2563 | if (MemberOfUnknownSpecialization || |
| 2564 | (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation)) |
| 2565 | return ActOnDependentIdExpression(SS, TemplateKWLoc, NameInfo, |
| 2566 | IsAddressOfOperand, TemplateArgs); |
| 2567 | } else { |
| 2568 | bool IvarLookupFollowUp = II && !SS.isSet() && getCurMethodDecl(); |
| 2569 | LookupParsedName(R, S, &SS, !IvarLookupFollowUp); |
| 2570 | |
| 2571 | // If the result might be in a dependent base class, this is a dependent |
| 2572 | // id-expression. |
| 2573 | if (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation) |
| 2574 | return ActOnDependentIdExpression(SS, TemplateKWLoc, NameInfo, |
| 2575 | IsAddressOfOperand, TemplateArgs); |
| 2576 | |
| 2577 | // If this reference is in an Objective-C method, then we need to do |
| 2578 | // some special Objective-C lookup, too. |
| 2579 | if (IvarLookupFollowUp) { |
| 2580 | ExprResult E(LookupInObjCMethod(R, S, II, true)); |
| 2581 | if (E.isInvalid()) |
| 2582 | return ExprError(); |
| 2583 | |
| 2584 | if (Expr *Ex = E.getAs<Expr>()) |
| 2585 | return Ex; |
| 2586 | } |
| 2587 | } |
| 2588 | |
| 2589 | if (R.isAmbiguous()) |
| 2590 | return ExprError(); |
| 2591 | |
| 2592 | // This could be an implicitly declared function reference if the language |
| 2593 | // mode allows it as a feature. |
| 2594 | if (R.empty() && HasTrailingLParen && II && |
| 2595 | getLangOpts().implicitFunctionsAllowed()) { |
| 2596 | NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *II, S); |
| 2597 | if (D) R.addDecl(D); |
| 2598 | } |
| 2599 | |
| 2600 | // Determine whether this name might be a candidate for |
| 2601 | // argument-dependent lookup. |
| 2602 | bool ADL = UseArgumentDependentLookup(SS, R, HasTrailingLParen); |
| 2603 | |
| 2604 | if (R.empty() && !ADL) { |
| 2605 | if (SS.isEmpty() && getLangOpts().MSVCCompat) { |
| 2606 | if (Expr *E = recoverFromMSUnqualifiedLookup(*this, Context, NameInfo, |
| 2607 | TemplateKWLoc, TemplateArgs)) |
| 2608 | return E; |
| 2609 | } |
| 2610 | |
| 2611 | // Don't diagnose an empty lookup for inline assembly. |
| 2612 | if (IsInlineAsmIdentifier) |
| 2613 | return ExprError(); |
| 2614 | |
| 2615 | // If this name wasn't predeclared and if this is not a function |
| 2616 | // call, diagnose the problem. |
| 2617 | TypoExpr *TE = nullptr; |
| 2618 | DefaultFilterCCC DefaultValidator(II, SS.isValid() ? SS.getScopeRep() |
| 2619 | : nullptr); |
| 2620 | DefaultValidator.IsAddressOfOperand = IsAddressOfOperand; |
| 2621 | assert((!CCC || CCC->IsAddressOfOperand == IsAddressOfOperand) &&(static_cast <bool> ((!CCC || CCC->IsAddressOfOperand == IsAddressOfOperand) && "Typo correction callback misconfigured" ) ? void (0) : __assert_fail ("(!CCC || CCC->IsAddressOfOperand == IsAddressOfOperand) && \"Typo correction callback misconfigured\"" , "clang/lib/Sema/SemaExpr.cpp", 2622, __extension__ __PRETTY_FUNCTION__ )) |
| 2622 | "Typo correction callback misconfigured")(static_cast <bool> ((!CCC || CCC->IsAddressOfOperand == IsAddressOfOperand) && "Typo correction callback misconfigured" ) ? void (0) : __assert_fail ("(!CCC || CCC->IsAddressOfOperand == IsAddressOfOperand) && \"Typo correction callback misconfigured\"" , "clang/lib/Sema/SemaExpr.cpp", 2622, __extension__ __PRETTY_FUNCTION__ )); |
| 2623 | if (CCC) { |
| 2624 | // Make sure the callback knows what the typo being diagnosed is. |
| 2625 | CCC->setTypoName(II); |
| 2626 | if (SS.isValid()) |
| 2627 | CCC->setTypoNNS(SS.getScopeRep()); |
| 2628 | } |
| 2629 | // FIXME: DiagnoseEmptyLookup produces bad diagnostics if we're looking for |
| 2630 | // a template name, but we happen to have always already looked up the name |
| 2631 | // before we get here if it must be a template name. |
| 2632 | if (DiagnoseEmptyLookup(S, SS, R, CCC ? *CCC : DefaultValidator, nullptr, |
| 2633 | std::nullopt, &TE)) { |
| 2634 | if (TE && KeywordReplacement) { |
| 2635 | auto &State = getTypoExprState(TE); |
| 2636 | auto BestTC = State.Consumer->getNextCorrection(); |
| 2637 | if (BestTC.isKeyword()) { |
| 2638 | auto *II = BestTC.getCorrectionAsIdentifierInfo(); |
| 2639 | if (State.DiagHandler) |
| 2640 | State.DiagHandler(BestTC); |
| 2641 | KeywordReplacement->startToken(); |
| 2642 | KeywordReplacement->setKind(II->getTokenID()); |
| 2643 | KeywordReplacement->setIdentifierInfo(II); |
| 2644 | KeywordReplacement->setLocation(BestTC.getCorrectionRange().getBegin()); |
| 2645 | // Clean up the state associated with the TypoExpr, since it has |
| 2646 | // now been diagnosed (without a call to CorrectDelayedTyposInExpr). |
| 2647 | clearDelayedTypo(TE); |
| 2648 | // Signal that a correction to a keyword was performed by returning a |
| 2649 | // valid-but-null ExprResult. |
| 2650 | return (Expr*)nullptr; |
| 2651 | } |
| 2652 | State.Consumer->resetCorrectionStream(); |
| 2653 | } |
| 2654 | return TE ? TE : ExprError(); |
| 2655 | } |
| 2656 | |
| 2657 | assert(!R.empty() &&(static_cast <bool> (!R.empty() && "DiagnoseEmptyLookup returned false but added no results" ) ? void (0) : __assert_fail ("!R.empty() && \"DiagnoseEmptyLookup returned false but added no results\"" , "clang/lib/Sema/SemaExpr.cpp", 2658, __extension__ __PRETTY_FUNCTION__ )) |
| 2658 | "DiagnoseEmptyLookup returned false but added no results")(static_cast <bool> (!R.empty() && "DiagnoseEmptyLookup returned false but added no results" ) ? void (0) : __assert_fail ("!R.empty() && \"DiagnoseEmptyLookup returned false but added no results\"" , "clang/lib/Sema/SemaExpr.cpp", 2658, __extension__ __PRETTY_FUNCTION__ )); |
| 2659 | |
| 2660 | // If we found an Objective-C instance variable, let |
| 2661 | // LookupInObjCMethod build the appropriate expression to |
| 2662 | // reference the ivar. |
| 2663 | if (ObjCIvarDecl *Ivar = R.getAsSingle<ObjCIvarDecl>()) { |
| 2664 | R.clear(); |
| 2665 | ExprResult E(LookupInObjCMethod(R, S, Ivar->getIdentifier())); |
| 2666 | // In a hopelessly buggy code, Objective-C instance variable |
| 2667 | // lookup fails and no expression will be built to reference it. |
| 2668 | if (!E.isInvalid() && !E.get()) |
| 2669 | return ExprError(); |
| 2670 | return E; |
| 2671 | } |
| 2672 | } |
| 2673 | |
| 2674 | // This is guaranteed from this point on. |
| 2675 | assert(!R.empty() || ADL)(static_cast <bool> (!R.empty() || ADL) ? void (0) : __assert_fail ("!R.empty() || ADL", "clang/lib/Sema/SemaExpr.cpp", 2675, __extension__ __PRETTY_FUNCTION__)); |
| 2676 | |
| 2677 | // Check whether this might be a C++ implicit instance member access. |
| 2678 | // C++ [class.mfct.non-static]p3: |
| 2679 | // When an id-expression that is not part of a class member access |
| 2680 | // syntax and not used to form a pointer to member is used in the |
| 2681 | // body of a non-static member function of class X, if name lookup |
| 2682 | // resolves the name in the id-expression to a non-static non-type |
| 2683 | // member of some class C, the id-expression is transformed into a |
| 2684 | // class member access expression using (*this) as the |
| 2685 | // postfix-expression to the left of the . operator. |
| 2686 | // |
| 2687 | // But we don't actually need to do this for '&' operands if R |
| 2688 | // resolved to a function or overloaded function set, because the |
| 2689 | // expression is ill-formed if it actually works out to be a |
| 2690 | // non-static member function: |
| 2691 | // |
| 2692 | // C++ [expr.ref]p4: |
| 2693 | // Otherwise, if E1.E2 refers to a non-static member function. . . |
| 2694 | // [t]he expression can be used only as the left-hand operand of a |
| 2695 | // member function call. |
| 2696 | // |
| 2697 | // There are other safeguards against such uses, but it's important |
| 2698 | // to get this right here so that we don't end up making a |
| 2699 | // spuriously dependent expression if we're inside a dependent |
| 2700 | // instance method. |
| 2701 | if (!R.empty() && (*R.begin())->isCXXClassMember()) { |
| 2702 | bool MightBeImplicitMember; |
| 2703 | if (!IsAddressOfOperand) |
| 2704 | MightBeImplicitMember = true; |
| 2705 | else if (!SS.isEmpty()) |
| 2706 | MightBeImplicitMember = false; |
| 2707 | else if (R.isOverloadedResult()) |
| 2708 | MightBeImplicitMember = false; |
| 2709 | else if (R.isUnresolvableResult()) |
| 2710 | MightBeImplicitMember = true; |
| 2711 | else |
| 2712 | MightBeImplicitMember = isa<FieldDecl>(R.getFoundDecl()) || |
| 2713 | isa<IndirectFieldDecl>(R.getFoundDecl()) || |
| 2714 | isa<MSPropertyDecl>(R.getFoundDecl()); |
| 2715 | |
| 2716 | if (MightBeImplicitMember) |
| 2717 | return BuildPossibleImplicitMemberExpr(SS, TemplateKWLoc, |
| 2718 | R, TemplateArgs, S); |
| 2719 | } |
| 2720 | |
| 2721 | if (TemplateArgs || TemplateKWLoc.isValid()) { |
| 2722 | |
| 2723 | // In C++1y, if this is a variable template id, then check it |
| 2724 | // in BuildTemplateIdExpr(). |
| 2725 | // The single lookup result must be a variable template declaration. |
| 2726 | if (Id.getKind() == UnqualifiedIdKind::IK_TemplateId && Id.TemplateId && |
| 2727 | Id.TemplateId->Kind == TNK_Var_template) { |
| 2728 | assert(R.getAsSingle<VarTemplateDecl>() &&(static_cast <bool> (R.getAsSingle<VarTemplateDecl> () && "There should only be one declaration found.") ? void (0) : __assert_fail ("R.getAsSingle<VarTemplateDecl>() && \"There should only be one declaration found.\"" , "clang/lib/Sema/SemaExpr.cpp", 2729, __extension__ __PRETTY_FUNCTION__ )) |
| 2729 | "There should only be one declaration found.")(static_cast <bool> (R.getAsSingle<VarTemplateDecl> () && "There should only be one declaration found.") ? void (0) : __assert_fail ("R.getAsSingle<VarTemplateDecl>() && \"There should only be one declaration found.\"" , "clang/lib/Sema/SemaExpr.cpp", 2729, __extension__ __PRETTY_FUNCTION__ )); |
| 2730 | } |
| 2731 | |
| 2732 | return BuildTemplateIdExpr(SS, TemplateKWLoc, R, ADL, TemplateArgs); |
| 2733 | } |
| 2734 | |
| 2735 | return BuildDeclarationNameExpr(SS, R, ADL); |
| 2736 | } |
| 2737 | |
| 2738 | /// BuildQualifiedDeclarationNameExpr - Build a C++ qualified |
| 2739 | /// declaration name, generally during template instantiation. |
| 2740 | /// There's a large number of things which don't need to be done along |
| 2741 | /// this path. |
| 2742 | ExprResult Sema::BuildQualifiedDeclarationNameExpr( |
| 2743 | CXXScopeSpec &SS, const DeclarationNameInfo &NameInfo, |
| 2744 | bool IsAddressOfOperand, const Scope *S, TypeSourceInfo **RecoveryTSI) { |
| 2745 | if (NameInfo.getName().isDependentName()) |
| 2746 | return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(), |
| 2747 | NameInfo, /*TemplateArgs=*/nullptr); |
| 2748 | |
| 2749 | DeclContext *DC = computeDeclContext(SS, false); |
| 2750 | if (!DC) |
| 2751 | return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(), |
| 2752 | NameInfo, /*TemplateArgs=*/nullptr); |
| 2753 | |
| 2754 | if (RequireCompleteDeclContext(SS, DC)) |
| 2755 | return ExprError(); |
| 2756 | |
| 2757 | LookupResult R(*this, NameInfo, LookupOrdinaryName); |
| 2758 | LookupQualifiedName(R, DC); |
| 2759 | |
| 2760 | if (R.isAmbiguous()) |
| 2761 | return ExprError(); |
| 2762 | |
| 2763 | if (R.getResultKind() == LookupResult::NotFoundInCurrentInstantiation) |
| 2764 | return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(), |
| 2765 | NameInfo, /*TemplateArgs=*/nullptr); |
| 2766 | |
| 2767 | if (R.empty()) { |
| 2768 | // Don't diagnose problems with invalid record decl, the secondary no_member |
| 2769 | // diagnostic during template instantiation is likely bogus, e.g. if a class |
| 2770 | // is invalid because it's derived from an invalid base class, then missing |
| 2771 | // members were likely supposed to be inherited. |
| 2772 | if (const auto *CD = dyn_cast<CXXRecordDecl>(DC)) |
| 2773 | if (CD->isInvalidDecl()) |
| 2774 | return ExprError(); |
| 2775 | Diag(NameInfo.getLoc(), diag::err_no_member) |
| 2776 | << NameInfo.getName() << DC << SS.getRange(); |
| 2777 | return ExprError(); |
| 2778 | } |
| 2779 | |
| 2780 | if (const TypeDecl *TD = R.getAsSingle<TypeDecl>()) { |
| 2781 | // Diagnose a missing typename if this resolved unambiguously to a type in |
| 2782 | // a dependent context. If we can recover with a type, downgrade this to |
| 2783 | // a warning in Microsoft compatibility mode. |
| 2784 | unsigned DiagID = diag::err_typename_missing; |
| 2785 | if (RecoveryTSI && getLangOpts().MSVCCompat) |
| 2786 | DiagID = diag::ext_typename_missing; |
| 2787 | SourceLocation Loc = SS.getBeginLoc(); |
| 2788 | auto D = Diag(Loc, DiagID); |
| 2789 | D << SS.getScopeRep() << NameInfo.getName().getAsString() |
| 2790 | << SourceRange(Loc, NameInfo.getEndLoc()); |
| 2791 | |
| 2792 | // Don't recover if the caller isn't expecting us to or if we're in a SFINAE |
| 2793 | // context. |
| 2794 | if (!RecoveryTSI) |
| 2795 | return ExprError(); |
| 2796 | |
| 2797 | // Only issue the fixit if we're prepared to recover. |
| 2798 | D << FixItHint::CreateInsertion(Loc, "typename "); |
| 2799 | |
| 2800 | // Recover by pretending this was an elaborated type. |
| 2801 | QualType Ty = Context.getTypeDeclType(TD); |
| 2802 | TypeLocBuilder TLB; |
| 2803 | TLB.pushTypeSpec(Ty).setNameLoc(NameInfo.getLoc()); |
| 2804 | |
| 2805 | QualType ET = getElaboratedType(ETK_None, SS, Ty); |
| 2806 | ElaboratedTypeLoc QTL = TLB.push<ElaboratedTypeLoc>(ET); |
| 2807 | QTL.setElaboratedKeywordLoc(SourceLocation()); |
| 2808 | QTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
| 2809 | |
| 2810 | *RecoveryTSI = TLB.getTypeSourceInfo(Context, ET); |
| 2811 | |
| 2812 | return ExprEmpty(); |
| 2813 | } |
| 2814 | |
| 2815 | // Defend against this resolving to an implicit member access. We usually |
| 2816 | // won't get here if this might be a legitimate a class member (we end up in |
| 2817 | // BuildMemberReferenceExpr instead), but this can be valid if we're forming |
| 2818 | // a pointer-to-member or in an unevaluated context in C++11. |
| 2819 | if (!R.empty() && (*R.begin())->isCXXClassMember() && !IsAddressOfOperand) |
| 2820 | return BuildPossibleImplicitMemberExpr(SS, |
| 2821 | /*TemplateKWLoc=*/SourceLocation(), |
| 2822 | R, /*TemplateArgs=*/nullptr, S); |
| 2823 | |
| 2824 | return BuildDeclarationNameExpr(SS, R, /* ADL */ false); |
| 2825 | } |
| 2826 | |
| 2827 | /// The parser has read a name in, and Sema has detected that we're currently |
| 2828 | /// inside an ObjC method. Perform some additional checks and determine if we |
| 2829 | /// should form a reference to an ivar. |
| 2830 | /// |
| 2831 | /// Ideally, most of this would be done by lookup, but there's |
| 2832 | /// actually quite a lot of extra work involved. |
| 2833 | DeclResult Sema::LookupIvarInObjCMethod(LookupResult &Lookup, Scope *S, |
| 2834 | IdentifierInfo *II) { |
| 2835 | SourceLocation Loc = Lookup.getNameLoc(); |
| 2836 | ObjCMethodDecl *CurMethod = getCurMethodDecl(); |
| 2837 | |
| 2838 | // Check for error condition which is already reported. |
| 2839 | if (!CurMethod) |
| 2840 | return DeclResult(true); |
| 2841 | |
| 2842 | // There are two cases to handle here. 1) scoped lookup could have failed, |
| 2843 | // in which case we should look for an ivar. 2) scoped lookup could have |
| 2844 | // found a decl, but that decl is outside the current instance method (i.e. |
| 2845 | // a global variable). In these two cases, we do a lookup for an ivar with |
| 2846 | // this name, if the lookup sucedes, we replace it our current decl. |
| 2847 | |
| 2848 | // If we're in a class method, we don't normally want to look for |
| 2849 | // ivars. But if we don't find anything else, and there's an |
| 2850 | // ivar, that's an error. |
| 2851 | bool IsClassMethod = CurMethod->isClassMethod(); |
| 2852 | |
| 2853 | bool LookForIvars; |
| 2854 | if (Lookup.empty()) |
| 2855 | LookForIvars = true; |
| 2856 | else if (IsClassMethod) |
| 2857 | LookForIvars = false; |
| 2858 | else |
| 2859 | LookForIvars = (Lookup.isSingleResult() && |
| 2860 | Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod()); |
| 2861 | ObjCInterfaceDecl *IFace = nullptr; |
| 2862 | if (LookForIvars) { |
| 2863 | IFace = CurMethod->getClassInterface(); |
| 2864 | ObjCInterfaceDecl *ClassDeclared; |
| 2865 | ObjCIvarDecl *IV = nullptr; |
| 2866 | if (IFace && (IV = IFace->lookupInstanceVariable(II, ClassDeclared))) { |
| 2867 | // Diagnose using an ivar in a class method. |
| 2868 | if (IsClassMethod) { |
| 2869 | Diag(Loc, diag::err_ivar_use_in_class_method) << IV->getDeclName(); |
| 2870 | return DeclResult(true); |
| 2871 | } |
| 2872 | |
| 2873 | // Diagnose the use of an ivar outside of the declaring class. |
| 2874 | if (IV->getAccessControl() == ObjCIvarDecl::Private && |
| 2875 | !declaresSameEntity(ClassDeclared, IFace) && |
| 2876 | !getLangOpts().DebuggerSupport) |
| 2877 | Diag(Loc, diag::err_private_ivar_access) << IV->getDeclName(); |
| 2878 | |
| 2879 | // Success. |
| 2880 | return IV; |
| 2881 | } |
| 2882 | } else if (CurMethod->isInstanceMethod()) { |
| 2883 | // We should warn if a local variable hides an ivar. |
| 2884 | if (ObjCInterfaceDecl *IFace = CurMethod->getClassInterface()) { |
| 2885 | ObjCInterfaceDecl *ClassDeclared; |
| 2886 | if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { |
| 2887 | if (IV->getAccessControl() != ObjCIvarDecl::Private || |
| 2888 | declaresSameEntity(IFace, ClassDeclared)) |
| 2889 | Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName(); |
| 2890 | } |
| 2891 | } |
| 2892 | } else if (Lookup.isSingleResult() && |
| 2893 | Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod()) { |
| 2894 | // If accessing a stand-alone ivar in a class method, this is an error. |
| 2895 | if (const ObjCIvarDecl *IV = |
| 2896 | dyn_cast<ObjCIvarDecl>(Lookup.getFoundDecl())) { |
| 2897 | Diag(Loc, diag::err_ivar_use_in_class_method) << IV->getDeclName(); |
| 2898 | return DeclResult(true); |
| 2899 | } |
| 2900 | } |
| 2901 | |
| 2902 | // Didn't encounter an error, didn't find an ivar. |
| 2903 | return DeclResult(false); |
| 2904 | } |
| 2905 | |
| 2906 | ExprResult Sema::BuildIvarRefExpr(Scope *S, SourceLocation Loc, |
| 2907 | ObjCIvarDecl *IV) { |
| 2908 | ObjCMethodDecl *CurMethod = getCurMethodDecl(); |
| 2909 | assert(CurMethod && CurMethod->isInstanceMethod() &&(static_cast <bool> (CurMethod && CurMethod-> isInstanceMethod() && "should not reference ivar from this context" ) ? void (0) : __assert_fail ("CurMethod && CurMethod->isInstanceMethod() && \"should not reference ivar from this context\"" , "clang/lib/Sema/SemaExpr.cpp", 2910, __extension__ __PRETTY_FUNCTION__ )) |
| 2910 | "should not reference ivar from this context")(static_cast <bool> (CurMethod && CurMethod-> isInstanceMethod() && "should not reference ivar from this context" ) ? void (0) : __assert_fail ("CurMethod && CurMethod->isInstanceMethod() && \"should not reference ivar from this context\"" , "clang/lib/Sema/SemaExpr.cpp", 2910, __extension__ __PRETTY_FUNCTION__ )); |
| 2911 | |
| 2912 | ObjCInterfaceDecl *IFace = CurMethod->getClassInterface(); |
| 2913 | assert(IFace && "should not reference ivar from this context")(static_cast <bool> (IFace && "should not reference ivar from this context" ) ? void (0) : __assert_fail ("IFace && \"should not reference ivar from this context\"" , "clang/lib/Sema/SemaExpr.cpp", 2913, __extension__ __PRETTY_FUNCTION__ )); |
| 2914 | |
| 2915 | // If we're referencing an invalid decl, just return this as a silent |
| 2916 | // error node. The error diagnostic was already emitted on the decl. |
| 2917 | if (IV->isInvalidDecl()) |
| 2918 | return ExprError(); |
| 2919 | |
| 2920 | // Check if referencing a field with __attribute__((deprecated)). |
| 2921 | if (DiagnoseUseOfDecl(IV, Loc)) |
| 2922 | return ExprError(); |
| 2923 | |
| 2924 | // FIXME: This should use a new expr for a direct reference, don't |
| 2925 | // turn this into Self->ivar, just return a BareIVarExpr or something. |
| 2926 | IdentifierInfo &II = Context.Idents.get("self"); |
| 2927 | UnqualifiedId SelfName; |
| 2928 | SelfName.setImplicitSelfParam(&II); |
| 2929 | CXXScopeSpec SelfScopeSpec; |
| 2930 | SourceLocation TemplateKWLoc; |
| 2931 | ExprResult SelfExpr = |
| 2932 | ActOnIdExpression(S, SelfScopeSpec, TemplateKWLoc, SelfName, |
| 2933 | /*HasTrailingLParen=*/false, |
| 2934 | /*IsAddressOfOperand=*/false); |
| 2935 | if (SelfExpr.isInvalid()) |
| 2936 | return ExprError(); |
| 2937 | |
| 2938 | SelfExpr = DefaultLvalueConversion(SelfExpr.get()); |
| 2939 | if (SelfExpr.isInvalid()) |
| 2940 | return ExprError(); |
| 2941 | |
| 2942 | MarkAnyDeclReferenced(Loc, IV, true); |
| 2943 | |
| 2944 | ObjCMethodFamily MF = CurMethod->getMethodFamily(); |
| 2945 | if (MF != OMF_init && MF != OMF_dealloc && MF != OMF_finalize && |
| 2946 | !IvarBacksCurrentMethodAccessor(IFace, CurMethod, IV)) |
| 2947 | Diag(Loc, diag::warn_direct_ivar_access) << IV->getDeclName(); |
| 2948 | |
| 2949 | ObjCIvarRefExpr *Result = new (Context) |
| 2950 | ObjCIvarRefExpr(IV, IV->getUsageType(SelfExpr.get()->getType()), Loc, |
| 2951 | IV->getLocation(), SelfExpr.get(), true, true); |
| 2952 | |
| 2953 | if (IV->getType().getObjCLifetime() == Qualifiers::OCL_Weak) { |
| 2954 | if (!isUnevaluatedContext() && |
| 2955 | !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, Loc)) |
| 2956 | getCurFunction()->recordUseOfWeak(Result); |
| 2957 | } |
| 2958 | if (getLangOpts().ObjCAutoRefCount && !isUnevaluatedContext()) |
| 2959 | if (const BlockDecl *BD = CurContext->getInnermostBlockDecl()) |
| 2960 | ImplicitlyRetainedSelfLocs.push_back({Loc, BD}); |
| 2961 | |
| 2962 | return Result; |
| 2963 | } |
| 2964 | |
| 2965 | /// The parser has read a name in, and Sema has detected that we're currently |
| 2966 | /// inside an ObjC method. Perform some additional checks and determine if we |
| 2967 | /// should form a reference to an ivar. If so, build an expression referencing |
| 2968 | /// that ivar. |
| 2969 | ExprResult |
| 2970 | Sema::LookupInObjCMethod(LookupResult &Lookup, Scope *S, |
| 2971 | IdentifierInfo *II, bool AllowBuiltinCreation) { |
| 2972 | // FIXME: Integrate this lookup step into LookupParsedName. |
| 2973 | DeclResult Ivar = LookupIvarInObjCMethod(Lookup, S, II); |
| 2974 | if (Ivar.isInvalid()) |
| 2975 | return ExprError(); |
| 2976 | if (Ivar.isUsable()) |
| 2977 | return BuildIvarRefExpr(S, Lookup.getNameLoc(), |
| 2978 | cast<ObjCIvarDecl>(Ivar.get())); |
| 2979 | |
| 2980 | if (Lookup.empty() && II && AllowBuiltinCreation) |
| 2981 | LookupBuiltin(Lookup); |
| 2982 | |
| 2983 | // Sentinel value saying that we didn't do anything special. |
| 2984 | return ExprResult(false); |
| 2985 | } |
| 2986 | |
| 2987 | /// Cast a base object to a member's actual type. |
| 2988 | /// |
| 2989 | /// There are two relevant checks: |
| 2990 | /// |
| 2991 | /// C++ [class.access.base]p7: |
| 2992 | /// |
| 2993 | /// If a class member access operator [...] is used to access a non-static |
| 2994 | /// data member or non-static member function, the reference is ill-formed if |
| 2995 | /// the left operand [...] cannot be implicitly converted to a pointer to the |
| 2996 | /// naming class of the right operand. |
| 2997 | /// |
| 2998 | /// C++ [expr.ref]p7: |
| 2999 | /// |
| 3000 | /// If E2 is a non-static data member or a non-static member function, the |
| 3001 | /// program is ill-formed if the class of which E2 is directly a member is an |
| 3002 | /// ambiguous base (11.8) of the naming class (11.9.3) of E2. |
| 3003 | /// |
| 3004 | /// Note that the latter check does not consider access; the access of the |
| 3005 | /// "real" base class is checked as appropriate when checking the access of the |
| 3006 | /// member name. |
| 3007 | ExprResult |
| 3008 | Sema::PerformObjectMemberConversion(Expr *From, |
| 3009 | NestedNameSpecifier *Qualifier, |
| 3010 | NamedDecl *FoundDecl, |
| 3011 | NamedDecl *Member) { |
| 3012 | CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Member->getDeclContext()); |
| 3013 | if (!RD) |
| 3014 | return From; |
| 3015 | |
| 3016 | QualType DestRecordType; |
| 3017 | QualType DestType; |
| 3018 | QualType FromRecordType; |
| 3019 | QualType FromType = From->getType(); |
| 3020 | bool PointerConversions = false; |
| 3021 | if (isa<FieldDecl>(Member)) { |
| 3022 | DestRecordType = Context.getCanonicalType(Context.getTypeDeclType(RD)); |
| 3023 | auto FromPtrType = FromType->getAs<PointerType>(); |
| 3024 | DestRecordType = Context.getAddrSpaceQualType( |
| 3025 | DestRecordType, FromPtrType |
| 3026 | ? FromType->getPointeeType().getAddressSpace() |
| 3027 | : FromType.getAddressSpace()); |
| 3028 | |
| 3029 | if (FromPtrType) { |
| 3030 | DestType = Context.getPointerType(DestRecordType); |
| 3031 | FromRecordType = FromPtrType->getPointeeType(); |
| 3032 | PointerConversions = true; |
| 3033 | } else { |
| 3034 | DestType = DestRecordType; |
| 3035 | FromRecordType = FromType; |
| 3036 | } |
| 3037 | } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) { |
| 3038 | if (Method->isStatic()) |
| 3039 | return From; |
| 3040 | |
| 3041 | DestType = Method->getThisType(); |
| 3042 | DestRecordType = DestType->getPointeeType(); |
| 3043 | |
| 3044 | if (FromType->getAs<PointerType>()) { |
| 3045 | FromRecordType = FromType->getPointeeType(); |
| 3046 | PointerConversions = true; |
| 3047 | } else { |
| 3048 | FromRecordType = FromType; |
| 3049 | DestType = DestRecordType; |
| 3050 | } |
| 3051 | |
| 3052 | LangAS FromAS = FromRecordType.getAddressSpace(); |
| 3053 | LangAS DestAS = DestRecordType.getAddressSpace(); |
| 3054 | if (FromAS != DestAS) { |
| 3055 | QualType FromRecordTypeWithoutAS = |
| 3056 | Context.removeAddrSpaceQualType(FromRecordType); |
| 3057 | QualType FromTypeWithDestAS = |
| 3058 | Context.getAddrSpaceQualType(FromRecordTypeWithoutAS, DestAS); |
| 3059 | if (PointerConversions) |
| 3060 | FromTypeWithDestAS = Context.getPointerType(FromTypeWithDestAS); |
| 3061 | From = ImpCastExprToType(From, FromTypeWithDestAS, |
| 3062 | CK_AddressSpaceConversion, From->getValueKind()) |
| 3063 | .get(); |
| 3064 | } |
| 3065 | } else { |
| 3066 | // No conversion necessary. |
| 3067 | return From; |
| 3068 | } |
| 3069 | |
| 3070 | if (DestType->isDependentType() || FromType->isDependentType()) |
| 3071 | return From; |
| 3072 | |
| 3073 | // If the unqualified types are the same, no conversion is necessary. |
| 3074 | if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType)) |
| 3075 | return From; |
| 3076 | |
| 3077 | SourceRange FromRange = From->getSourceRange(); |
| 3078 | SourceLocation FromLoc = FromRange.getBegin(); |
| 3079 | |
| 3080 | ExprValueKind VK = From->getValueKind(); |
| 3081 | |
| 3082 | // C++ [class.member.lookup]p8: |
| 3083 | // [...] Ambiguities can often be resolved by qualifying a name with its |
| 3084 | // class name. |
| 3085 | // |
| 3086 | // If the member was a qualified name and the qualified referred to a |
| 3087 | // specific base subobject type, we'll cast to that intermediate type |
| 3088 | // first and then to the object in which the member is declared. That allows |
| 3089 | // one to resolve ambiguities in, e.g., a diamond-shaped hierarchy such as: |
| 3090 | // |
| 3091 | // class Base { public: int x; }; |
| 3092 | // class Derived1 : public Base { }; |
| 3093 | // class Derived2 : public Base { }; |
| 3094 | // class VeryDerived : public Derived1, public Derived2 { void f(); }; |
| 3095 | // |
| 3096 | // void VeryDerived::f() { |
| 3097 | // x = 17; // error: ambiguous base subobjects |
| 3098 | // Derived1::x = 17; // okay, pick the Base subobject of Derived1 |
| 3099 | // } |
| 3100 | if (Qualifier && Qualifier->getAsType()) { |
| 3101 | QualType QType = QualType(Qualifier->getAsType(), 0); |
| 3102 | assert(QType->isRecordType() && "lookup done with non-record type")(static_cast <bool> (QType->isRecordType() && "lookup done with non-record type") ? void (0) : __assert_fail ("QType->isRecordType() && \"lookup done with non-record type\"" , "clang/lib/Sema/SemaExpr.cpp", 3102, __extension__ __PRETTY_FUNCTION__ )); |
| 3103 | |
| 3104 | QualType QRecordType = QualType(QType->castAs<RecordType>(), 0); |
| 3105 | |
| 3106 | // In C++98, the qualifier type doesn't actually have to be a base |
| 3107 | // type of the object type, in which case we just ignore it. |
| 3108 | // Otherwise build the appropriate casts. |
| 3109 | if (IsDerivedFrom(FromLoc, FromRecordType, QRecordType)) { |
| 3110 | CXXCastPath BasePath; |
| 3111 | if (CheckDerivedToBaseConversion(FromRecordType, QRecordType, |
| 3112 | FromLoc, FromRange, &BasePath)) |
| 3113 | return ExprError(); |
| 3114 | |
| 3115 | if (PointerConversions) |
| 3116 | QType = Context.getPointerType(QType); |
| 3117 | From = ImpCastExprToType(From, QType, CK_UncheckedDerivedToBase, |
| 3118 | VK, &BasePath).get(); |
| 3119 | |
| 3120 | FromType = QType; |
| 3121 | FromRecordType = QRecordType; |
| 3122 | |
| 3123 | // If the qualifier type was the same as the destination type, |
| 3124 | // we're done. |
| 3125 | if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType)) |
| 3126 | return From; |
| 3127 | } |
| 3128 | } |
| 3129 | |
| 3130 | CXXCastPath BasePath; |
| 3131 | if (CheckDerivedToBaseConversion(FromRecordType, DestRecordType, |
| 3132 | FromLoc, FromRange, &BasePath, |
| 3133 | /*IgnoreAccess=*/true)) |
| 3134 | return ExprError(); |
| 3135 | |
| 3136 | return ImpCastExprToType(From, DestType, CK_UncheckedDerivedToBase, |
| 3137 | VK, &BasePath); |
| 3138 | } |
| 3139 | |
| 3140 | bool Sema::UseArgumentDependentLookup(const CXXScopeSpec &SS, |
| 3141 | const LookupResult &R, |
| 3142 | bool HasTrailingLParen) { |
| 3143 | // Only when used directly as the postfix-expression of a call. |
| 3144 | if (!HasTrailingLParen) |
| 3145 | return false; |
| 3146 | |
| 3147 | // Never if a scope specifier was provided. |
| 3148 | if (SS.isSet()) |
| 3149 | return false; |
| 3150 | |
| 3151 | // Only in C++ or ObjC++. |
| 3152 | if (!getLangOpts().CPlusPlus) |
| 3153 | return false; |
| 3154 | |
| 3155 | // Turn off ADL when we find certain kinds of declarations during |
| 3156 | // normal lookup: |
| 3157 | for (NamedDecl *D : R) { |
| 3158 | // C++0x [basic.lookup.argdep]p3: |
| 3159 | // -- a declaration of a class member |
| 3160 | // Since using decls preserve this property, we check this on the |
| 3161 | // original decl. |
| 3162 | if (D->isCXXClassMember()) |
| 3163 | return false; |
| 3164 | |
| 3165 | // C++0x [basic.lookup.argdep]p3: |
| 3166 | // -- a block-scope function declaration that is not a |
| 3167 | // using-declaration |
| 3168 | // NOTE: we also trigger this for function templates (in fact, we |
| 3169 | // don't check the decl type at all, since all other decl types |
| 3170 | // turn off ADL anyway). |
| 3171 | if (isa<UsingShadowDecl>(D)) |
| 3172 | D = cast<UsingShadowDecl>(D)->getTargetDecl(); |
| 3173 | else if (D->getLexicalDeclContext()->isFunctionOrMethod()) |
| 3174 | return false; |
| 3175 | |
| 3176 | // C++0x [basic.lookup.argdep]p3: |
| 3177 | // -- a declaration that is neither a function or a function |
| 3178 | // template |
| 3179 | // And also for builtin functions. |
| 3180 | if (isa<FunctionDecl>(D)) { |
| 3181 | FunctionDecl *FDecl = cast<FunctionDecl>(D); |
| 3182 | |
| 3183 | // But also builtin functions. |
| 3184 | if (FDecl->getBuiltinID() && FDecl->isImplicit()) |
| 3185 | return false; |
| 3186 | } else if (!isa<FunctionTemplateDecl>(D)) |
| 3187 | return false; |
| 3188 | } |
| 3189 | |
| 3190 | return true; |
| 3191 | } |
| 3192 | |
| 3193 | |
| 3194 | /// Diagnoses obvious problems with the use of the given declaration |
| 3195 | /// as an expression. This is only actually called for lookups that |
| 3196 | /// were not overloaded, and it doesn't promise that the declaration |
| 3197 | /// will in fact be used. |
| 3198 | static bool CheckDeclInExpr(Sema &S, SourceLocation Loc, NamedDecl *D, |
| 3199 | bool AcceptInvalid) { |
| 3200 | if (D->isInvalidDecl() && !AcceptInvalid) |
| 3201 | return true; |
| 3202 | |
| 3203 | if (isa<TypedefNameDecl>(D)) { |
| 3204 | S.Diag(Loc, diag::err_unexpected_typedef) << D->getDeclName(); |
| 3205 | return true; |
| 3206 | } |
| 3207 | |
| 3208 | if (isa<ObjCInterfaceDecl>(D)) { |
| 3209 | S.Diag(Loc, diag::err_unexpected_interface) << D->getDeclName(); |
| 3210 | return true; |
| 3211 | } |
| 3212 | |
| 3213 | if (isa<NamespaceDecl>(D)) { |
| 3214 | S.Diag(Loc, diag::err_unexpected_namespace) << D->getDeclName(); |
| 3215 | return true; |
| 3216 | } |
| 3217 | |
| 3218 | return false; |
| 3219 | } |
| 3220 | |
| 3221 | // Certain multiversion types should be treated as overloaded even when there is |
| 3222 | // only one result. |
| 3223 | static bool ShouldLookupResultBeMultiVersionOverload(const LookupResult &R) { |
| 3224 | assert(R.isSingleResult() && "Expected only a single result")(static_cast <bool> (R.isSingleResult() && "Expected only a single result" ) ? void (0) : __assert_fail ("R.isSingleResult() && \"Expected only a single result\"" , "clang/lib/Sema/SemaExpr.cpp", 3224, __extension__ __PRETTY_FUNCTION__ )); |
| 3225 | const auto *FD = dyn_cast<FunctionDecl>(R.getFoundDecl()); |
| 3226 | return FD && |
| 3227 | (FD->isCPUDispatchMultiVersion() || FD->isCPUSpecificMultiVersion()); |
| 3228 | } |
| 3229 | |
| 3230 | ExprResult Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS, |
| 3231 | LookupResult &R, bool NeedsADL, |
| 3232 | bool AcceptInvalidDecl) { |
| 3233 | // If this is a single, fully-resolved result and we don't need ADL, |
| 3234 | // just build an ordinary singleton decl ref. |
| 3235 | if (!NeedsADL && R.isSingleResult() && |
| 3236 | !R.getAsSingle<FunctionTemplateDecl>() && |
| 3237 | !ShouldLookupResultBeMultiVersionOverload(R)) |
| 3238 | return BuildDeclarationNameExpr(SS, R.getLookupNameInfo(), R.getFoundDecl(), |
| 3239 | R.getRepresentativeDecl(), nullptr, |
| 3240 | AcceptInvalidDecl); |
| 3241 | |
| 3242 | // We only need to check the declaration if there's exactly one |
| 3243 | // result, because in the overloaded case the results can only be |
| 3244 | // functions and function templates. |
| 3245 | if (R.isSingleResult() && !ShouldLookupResultBeMultiVersionOverload(R) && |
| 3246 | CheckDeclInExpr(*this, R.getNameLoc(), R.getFoundDecl(), |
| 3247 | AcceptInvalidDecl)) |
| 3248 | return ExprError(); |
| 3249 | |
| 3250 | // Otherwise, just build an unresolved lookup expression. Suppress |
| 3251 | // any lookup-related diagnostics; we'll hash these out later, when |
| 3252 | // we've picked a target. |
| 3253 | R.suppressDiagnostics(); |
| 3254 | |
| 3255 | UnresolvedLookupExpr *ULE |
| 3256 | = UnresolvedLookupExpr::Create(Context, R.getNamingClass(), |
| 3257 | SS.getWithLocInContext(Context), |
| 3258 | R.getLookupNameInfo(), |
| 3259 | NeedsADL, R.isOverloadedResult(), |
| 3260 | R.begin(), R.end()); |
| 3261 | |
| 3262 | return ULE; |
| 3263 | } |
| 3264 | |
| 3265 | static void diagnoseUncapturableValueReferenceOrBinding(Sema &S, |
| 3266 | SourceLocation loc, |
| 3267 | ValueDecl *var); |
| 3268 | |
| 3269 | /// Complete semantic analysis for a reference to the given declaration. |
| 3270 | ExprResult Sema::BuildDeclarationNameExpr( |
| 3271 | const CXXScopeSpec &SS, const DeclarationNameInfo &NameInfo, NamedDecl *D, |
| 3272 | NamedDecl *FoundD, const TemplateArgumentListInfo *TemplateArgs, |
| 3273 | bool AcceptInvalidDecl) { |
| 3274 | assert(D && "Cannot refer to a NULL declaration")(static_cast <bool> (D && "Cannot refer to a NULL declaration" ) ? void (0) : __assert_fail ("D && \"Cannot refer to a NULL declaration\"" , "clang/lib/Sema/SemaExpr.cpp", 3274, __extension__ __PRETTY_FUNCTION__ )); |
| 3275 | assert(!isa<FunctionTemplateDecl>(D) &&(static_cast <bool> (!isa<FunctionTemplateDecl>(D ) && "Cannot refer unambiguously to a function template" ) ? void (0) : __assert_fail ("!isa<FunctionTemplateDecl>(D) && \"Cannot refer unambiguously to a function template\"" , "clang/lib/Sema/SemaExpr.cpp", 3276, __extension__ __PRETTY_FUNCTION__ )) |
| 3276 | "Cannot refer unambiguously to a function template")(static_cast <bool> (!isa<FunctionTemplateDecl>(D ) && "Cannot refer unambiguously to a function template" ) ? void (0) : __assert_fail ("!isa<FunctionTemplateDecl>(D) && \"Cannot refer unambiguously to a function template\"" , "clang/lib/Sema/SemaExpr.cpp", 3276, __extension__ __PRETTY_FUNCTION__ )); |
| 3277 | |
| 3278 | SourceLocation Loc = NameInfo.getLoc(); |
| 3279 | if (CheckDeclInExpr(*this, Loc, D, AcceptInvalidDecl)) { |
| 3280 | // Recovery from invalid cases (e.g. D is an invalid Decl). |
| 3281 | // We use the dependent type for the RecoveryExpr to prevent bogus follow-up |
| 3282 | // diagnostics, as invalid decls use int as a fallback type. |
| 3283 | return CreateRecoveryExpr(NameInfo.getBeginLoc(), NameInfo.getEndLoc(), {}); |
| 3284 | } |
| 3285 | |
| 3286 | if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) { |
| 3287 | // Specifically diagnose references to class templates that are missing |
| 3288 | // a template argument list. |
| 3289 | diagnoseMissingTemplateArguments(TemplateName(Template), Loc); |
| 3290 | return ExprError(); |
| 3291 | } |
| 3292 | |
| 3293 | // Make sure that we're referring to a value. |
| 3294 | if (!isa<ValueDecl, UnresolvedUsingIfExistsDecl>(D)) { |
| 3295 | Diag(Loc, diag::err_ref_non_value) << D << SS.getRange(); |
| 3296 | Diag(D->getLocation(), diag::note_declared_at); |
| 3297 | return ExprError(); |
| 3298 | } |
| 3299 | |
| 3300 | // Check whether this declaration can be used. Note that we suppress |
| 3301 | // this check when we're going to perform argument-dependent lookup |
| 3302 | // on this function name, because this might not be the function |
| 3303 | // that overload resolution actually selects. |
| 3304 | if (DiagnoseUseOfDecl(D, Loc)) |
| 3305 | return ExprError(); |
| 3306 | |
| 3307 | auto *VD = cast<ValueDecl>(D); |
| 3308 | |
| 3309 | // Only create DeclRefExpr's for valid Decl's. |
| 3310 | if (VD->isInvalidDecl() && !AcceptInvalidDecl) |
| 3311 | return ExprError(); |
| 3312 | |
| 3313 | // Handle members of anonymous structs and unions. If we got here, |
| 3314 | // and the reference is to a class member indirect field, then this |
| 3315 | // must be the subject of a pointer-to-member expression. |
| 3316 | if (IndirectFieldDecl *indirectField = dyn_cast<IndirectFieldDecl>(VD)) |
| 3317 | if (!indirectField->isCXXClassMember()) |
| 3318 | return BuildAnonymousStructUnionMemberReference(SS, NameInfo.getLoc(), |
| 3319 | indirectField); |
| 3320 | |
| 3321 | QualType type = VD->getType(); |
| 3322 | if (type.isNull()) |
| 3323 | return ExprError(); |
| 3324 | ExprValueKind valueKind = VK_PRValue; |
| 3325 | |
| 3326 | // In 'T ...V;', the type of the declaration 'V' is 'T...', but the type of |
| 3327 | // a reference to 'V' is simply (unexpanded) 'T'. The type, like the value, |
| 3328 | // is expanded by some outer '...' in the context of the use. |
| 3329 | type = type.getNonPackExpansionType(); |
| 3330 | |
| 3331 | switch (D->getKind()) { |
| 3332 | // Ignore all the non-ValueDecl kinds. |
| 3333 | #define ABSTRACT_DECL(kind) |
| 3334 | #define VALUE(type, base) |
| 3335 | #define DECL(type, base) case Decl::type: |
| 3336 | #include "clang/AST/DeclNodes.inc" |
| 3337 | llvm_unreachable("invalid value decl kind")::llvm::llvm_unreachable_internal("invalid value decl kind", "clang/lib/Sema/SemaExpr.cpp" , 3337); |
| 3338 | |
| 3339 | // These shouldn't make it here. |
| 3340 | case Decl::ObjCAtDefsField: |
| 3341 | llvm_unreachable("forming non-member reference to ivar?")::llvm::llvm_unreachable_internal("forming non-member reference to ivar?" , "clang/lib/Sema/SemaExpr.cpp", 3341); |
| 3342 | |
| 3343 | // Enum constants are always r-values and never references. |
| 3344 | // Unresolved using declarations are dependent. |
| 3345 | case Decl::EnumConstant: |
| 3346 | case Decl::UnresolvedUsingValue: |
| 3347 | case Decl::OMPDeclareReduction: |
| 3348 | case Decl::OMPDeclareMapper: |
| 3349 | valueKind = VK_PRValue; |
| 3350 | break; |
| 3351 | |
| 3352 | // Fields and indirect fields that got here must be for |
| 3353 | // pointer-to-member expressions; we just call them l-values for |
| 3354 | // internal consistency, because this subexpression doesn't really |
| 3355 | // exist in the high-level semantics. |
| 3356 | case Decl::Field: |
| 3357 | case Decl::IndirectField: |
| 3358 | case Decl::ObjCIvar: |
| 3359 | assert(getLangOpts().CPlusPlus && "building reference to field in C?")(static_cast <bool> (getLangOpts().CPlusPlus && "building reference to field in C?") ? void (0) : __assert_fail ("getLangOpts().CPlusPlus && \"building reference to field in C?\"" , "clang/lib/Sema/SemaExpr.cpp", 3359, __extension__ __PRETTY_FUNCTION__ )); |
| 3360 | |
| 3361 | // These can't have reference type in well-formed programs, but |
| 3362 | // for internal consistency we do this anyway. |
| 3363 | type = type.getNonReferenceType(); |
| 3364 | valueKind = VK_LValue; |
| 3365 | break; |
| 3366 | |
| 3367 | // Non-type template parameters are either l-values or r-values |
| 3368 | // depending on the type. |
| 3369 | case Decl::NonTypeTemplateParm: { |
| 3370 | if (const ReferenceType *reftype = type->getAs<ReferenceType>()) { |
| 3371 | type = reftype->getPointeeType(); |
| 3372 | valueKind = VK_LValue; // even if the parameter is an r-value reference |
| 3373 | break; |
| 3374 | } |
| 3375 | |
| 3376 | // [expr.prim.id.unqual]p2: |
| 3377 | // If the entity is a template parameter object for a template |
| 3378 | // parameter of type T, the type of the expression is const T. |
| 3379 | // [...] The expression is an lvalue if the entity is a [...] template |
| 3380 | // parameter object. |
| 3381 | if (type->isRecordType()) { |
| 3382 | type = type.getUnqualifiedType().withConst(); |
| 3383 | valueKind = VK_LValue; |
| 3384 | break; |
| 3385 | } |
| 3386 | |
| 3387 | // For non-references, we need to strip qualifiers just in case |
| 3388 | // the template parameter was declared as 'const int' or whatever. |
| 3389 | valueKind = VK_PRValue; |
| 3390 | type = type.getUnqualifiedType(); |
| 3391 | break; |
| 3392 | } |
| 3393 | |
| 3394 | case Decl::Var: |
| 3395 | case Decl::VarTemplateSpecialization: |
| 3396 | case Decl::VarTemplatePartialSpecialization: |
| 3397 | case Decl::Decomposition: |
| 3398 | case Decl::OMPCapturedExpr: |
| 3399 | // In C, "extern void blah;" is valid and is an r-value. |
| 3400 | if (!getLangOpts().CPlusPlus && !type.hasQualifiers() && |
| 3401 | type->isVoidType()) { |
| 3402 | valueKind = VK_PRValue; |
| 3403 | break; |
| 3404 | } |
| 3405 | [[fallthrough]]; |
| 3406 | |
| 3407 | case Decl::ImplicitParam: |
| 3408 | case Decl::ParmVar: { |
| 3409 | // These are always l-values. |
| 3410 | valueKind = VK_LValue; |
| 3411 | type = type.getNonReferenceType(); |
| 3412 | |
| 3413 | // FIXME: Does the addition of const really only apply in |
| 3414 | // potentially-evaluated contexts? Since the variable isn't actually |
| 3415 | // captured in an unevaluated context, it seems that the answer is no. |
| 3416 | if (!isUnevaluatedContext()) { |
| 3417 | QualType CapturedType = getCapturedDeclRefType(cast<VarDecl>(VD), Loc); |
| 3418 | if (!CapturedType.isNull()) |
| 3419 | type = CapturedType; |
| 3420 | } |
| 3421 | |
| 3422 | break; |
| 3423 | } |
| 3424 | |
| 3425 | case Decl::Binding: |
| 3426 | // These are always lvalues. |
| 3427 | valueKind = VK_LValue; |
| 3428 | type = type.getNonReferenceType(); |
| 3429 | break; |
| 3430 | |
| 3431 | case Decl::Function: { |
| 3432 | if (unsigned BID = cast<FunctionDecl>(VD)->getBuiltinID()) { |
| 3433 | if (!Context.BuiltinInfo.isDirectlyAddressable(BID)) { |
| 3434 | type = Context.BuiltinFnTy; |
| 3435 | valueKind = VK_PRValue; |
| 3436 | break; |
| 3437 | } |
| 3438 | } |
| 3439 | |
| 3440 | const FunctionType *fty = type->castAs<FunctionType>(); |
| 3441 | |
| 3442 | // If we're referring to a function with an __unknown_anytype |
| 3443 | // result type, make the entire expression __unknown_anytype. |
| 3444 | if (fty->getReturnType() == Context.UnknownAnyTy) { |
| 3445 | type = Context.UnknownAnyTy; |
| 3446 | valueKind = VK_PRValue; |
| 3447 | break; |
| 3448 | } |
| 3449 | |
| 3450 | // Functions are l-values in C++. |
| 3451 | if (getLangOpts().CPlusPlus) { |
| 3452 | valueKind = VK_LValue; |
| 3453 | break; |
| 3454 | } |
| 3455 | |
| 3456 | // C99 DR 316 says that, if a function type comes from a |
| 3457 | // function definition (without a prototype), that type is only |
| 3458 | // used for checking compatibility. Therefore, when referencing |
| 3459 | // the function, we pretend that we don't have the full function |
| 3460 | // type. |
| 3461 | if (!cast<FunctionDecl>(VD)->hasPrototype() && isa<FunctionProtoType>(fty)) |
| 3462 | type = Context.getFunctionNoProtoType(fty->getReturnType(), |
| 3463 | fty->getExtInfo()); |
| 3464 | |
| 3465 | // Functions are r-values in C. |
| 3466 | valueKind = VK_PRValue; |
| 3467 | break; |
| 3468 | } |
| 3469 | |
| 3470 | case Decl::CXXDeductionGuide: |
| 3471 | llvm_unreachable("building reference to deduction guide")::llvm::llvm_unreachable_internal("building reference to deduction guide" , "clang/lib/Sema/SemaExpr.cpp", 3471); |
| 3472 | |
| 3473 | case Decl::MSProperty: |
| 3474 | case Decl::MSGuid: |
| 3475 | case Decl::TemplateParamObject: |
| 3476 | // FIXME: Should MSGuidDecl and template parameter objects be subject to |
| 3477 | // capture in OpenMP, or duplicated between host and device? |
| 3478 | valueKind = VK_LValue; |
| 3479 | break; |
| 3480 | |
| 3481 | case Decl::UnnamedGlobalConstant: |
| 3482 | valueKind = VK_LValue; |
| 3483 | break; |
| 3484 | |
| 3485 | case Decl::CXXMethod: |
| 3486 | // If we're referring to a method with an __unknown_anytype |
| 3487 | // result type, make the entire expression __unknown_anytype. |
| 3488 | // This should only be possible with a type written directly. |
| 3489 | if (const FunctionProtoType *proto = |
| 3490 | dyn_cast<FunctionProtoType>(VD->getType())) |
| 3491 | if (proto->getReturnType() == Context.UnknownAnyTy) { |
| 3492 | type = Context.UnknownAnyTy; |
| 3493 | valueKind = VK_PRValue; |
| 3494 | break; |
| 3495 | } |
| 3496 | |
| 3497 | // C++ methods are l-values if static, r-values if non-static. |
| 3498 | if (cast<CXXMethodDecl>(VD)->isStatic()) { |
| 3499 | valueKind = VK_LValue; |
| 3500 | break; |
| 3501 | } |
| 3502 | [[fallthrough]]; |
| 3503 | |
| 3504 | case Decl::CXXConversion: |
| 3505 | case Decl::CXXDestructor: |
| 3506 | case Decl::CXXConstructor: |
| 3507 | valueKind = VK_PRValue; |
| 3508 | break; |
| 3509 | } |
| 3510 | |
| 3511 | auto *E = |
| 3512 | BuildDeclRefExpr(VD, type, valueKind, NameInfo, &SS, FoundD, |
| 3513 | /*FIXME: TemplateKWLoc*/ SourceLocation(), TemplateArgs); |
| 3514 | // Clang AST consumers assume a DeclRefExpr refers to a valid decl. We |
| 3515 | // wrap a DeclRefExpr referring to an invalid decl with a dependent-type |
| 3516 | // RecoveryExpr to avoid follow-up semantic analysis (thus prevent bogus |
| 3517 | // diagnostics). |
| 3518 | if (VD->isInvalidDecl() && E) |
| 3519 | return CreateRecoveryExpr(E->getBeginLoc(), E->getEndLoc(), {E}); |
| 3520 | return E; |
| 3521 | } |
| 3522 | |
| 3523 | static void ConvertUTF8ToWideString(unsigned CharByteWidth, StringRef Source, |
| 3524 | SmallString<32> &Target) { |
| 3525 | Target.resize(CharByteWidth * (Source.size() + 1)); |
| 3526 | char *ResultPtr = &Target[0]; |
| 3527 | const llvm::UTF8 *ErrorPtr; |
| 3528 | bool success = |
| 3529 | llvm::ConvertUTF8toWide(CharByteWidth, Source, ResultPtr, ErrorPtr); |
| 3530 | (void)success; |
| 3531 | assert(success)(static_cast <bool> (success) ? void (0) : __assert_fail ("success", "clang/lib/Sema/SemaExpr.cpp", 3531, __extension__ __PRETTY_FUNCTION__)); |
| 3532 | Target.resize(ResultPtr - &Target[0]); |
| 3533 | } |
| 3534 | |
| 3535 | ExprResult Sema::BuildPredefinedExpr(SourceLocation Loc, |
| 3536 | PredefinedExpr::IdentKind IK) { |
| 3537 | // Pick the current block, lambda, captured statement or function. |
| 3538 | Decl *currentDecl = nullptr; |
| 3539 | if (const BlockScopeInfo *BSI = getCurBlock()) |
| 3540 | currentDecl = BSI->TheDecl; |
| 3541 | else if (const LambdaScopeInfo *LSI = getCurLambda()) |
| 3542 | currentDecl = LSI->CallOperator; |
| 3543 | else if (const CapturedRegionScopeInfo *CSI = getCurCapturedRegion()) |
| 3544 | currentDecl = CSI->TheCapturedDecl; |
| 3545 | else |
| 3546 | currentDecl = getCurFunctionOrMethodDecl(); |
| 3547 | |
| 3548 | if (!currentDecl) { |
| 3549 | Diag(Loc, diag::ext_predef_outside_function); |
| 3550 | currentDecl = Context.getTranslationUnitDecl(); |
| 3551 | } |
| 3552 | |
| 3553 | QualType ResTy; |
| 3554 | StringLiteral *SL = nullptr; |
| 3555 | if (cast<DeclContext>(currentDecl)->isDependentContext()) |
| 3556 | ResTy = Context.DependentTy; |
| 3557 | else { |
| 3558 | // Pre-defined identifiers are of type char[x], where x is the length of |
| 3559 | // the string. |
| 3560 | auto Str = PredefinedExpr::ComputeName(IK, currentDecl); |
| 3561 | unsigned Length = Str.length(); |
| 3562 | |
| 3563 | llvm::APInt LengthI(32, Length + 1); |
| 3564 | if (IK == PredefinedExpr::LFunction || IK == PredefinedExpr::LFuncSig) { |
| 3565 | ResTy = |
| 3566 | Context.adjustStringLiteralBaseType(Context.WideCharTy.withConst()); |
| 3567 | SmallString<32> RawChars; |
| 3568 | ConvertUTF8ToWideString(Context.getTypeSizeInChars(ResTy).getQuantity(), |
| 3569 | Str, RawChars); |
| 3570 | ResTy = Context.getConstantArrayType(ResTy, LengthI, nullptr, |
| 3571 | ArrayType::Normal, |
| 3572 | /*IndexTypeQuals*/ 0); |
| 3573 | SL = StringLiteral::Create(Context, RawChars, StringLiteral::Wide, |
| 3574 | /*Pascal*/ false, ResTy, Loc); |
| 3575 | } else { |
| 3576 | ResTy = Context.adjustStringLiteralBaseType(Context.CharTy.withConst()); |
| 3577 | ResTy = Context.getConstantArrayType(ResTy, LengthI, nullptr, |
| 3578 | ArrayType::Normal, |
| 3579 | /*IndexTypeQuals*/ 0); |
| 3580 | SL = StringLiteral::Create(Context, Str, StringLiteral::Ordinary, |
| 3581 | /*Pascal*/ false, ResTy, Loc); |
| 3582 | } |
| 3583 | } |
| 3584 | |
| 3585 | return PredefinedExpr::Create(Context, Loc, ResTy, IK, SL); |
| 3586 | } |
| 3587 | |
| 3588 | ExprResult Sema::BuildSYCLUniqueStableNameExpr(SourceLocation OpLoc, |
| 3589 | SourceLocation LParen, |
| 3590 | SourceLocation RParen, |
| 3591 | TypeSourceInfo *TSI) { |
| 3592 | return SYCLUniqueStableNameExpr::Create(Context, OpLoc, LParen, RParen, TSI); |
| 3593 | } |
| 3594 | |
| 3595 | ExprResult Sema::ActOnSYCLUniqueStableNameExpr(SourceLocation OpLoc, |
| 3596 | SourceLocation LParen, |
| 3597 | SourceLocation RParen, |
| 3598 | ParsedType ParsedTy) { |
| 3599 | TypeSourceInfo *TSI = nullptr; |
| 3600 | QualType Ty = GetTypeFromParser(ParsedTy, &TSI); |
| 3601 | |
| 3602 | if (Ty.isNull()) |
| 3603 | return ExprError(); |
| 3604 | if (!TSI) |
| 3605 | TSI = Context.getTrivialTypeSourceInfo(Ty, LParen); |
| 3606 | |
| 3607 | return BuildSYCLUniqueStableNameExpr(OpLoc, LParen, RParen, TSI); |
| 3608 | } |
| 3609 | |
| 3610 | ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, tok::TokenKind Kind) { |
| 3611 | PredefinedExpr::IdentKind IK; |
| 3612 | |
| 3613 | switch (Kind) { |
| 3614 | default: llvm_unreachable("Unknown simple primary expr!")::llvm::llvm_unreachable_internal("Unknown simple primary expr!" , "clang/lib/Sema/SemaExpr.cpp", 3614); |
| 3615 | case tok::kw___func__: IK = PredefinedExpr::Func; break; // [C99 6.4.2.2] |
| 3616 | case tok::kw___FUNCTION__: IK = PredefinedExpr::Function; break; |
| 3617 | case tok::kw___FUNCDNAME__: IK = PredefinedExpr::FuncDName; break; // [MS] |
| 3618 | case tok::kw___FUNCSIG__: IK = PredefinedExpr::FuncSig; break; // [MS] |
| 3619 | case tok::kw_L__FUNCTION__: IK = PredefinedExpr::LFunction; break; // [MS] |
| 3620 | case tok::kw_L__FUNCSIG__: IK = PredefinedExpr::LFuncSig; break; // [MS] |
| 3621 | case tok::kw___PRETTY_FUNCTION__: IK = PredefinedExpr::PrettyFunction; break; |
| 3622 | } |
| 3623 | |
| 3624 | return BuildPredefinedExpr(Loc, IK); |
| 3625 | } |
| 3626 | |
| 3627 | ExprResult Sema::ActOnCharacterConstant(const Token &Tok, Scope *UDLScope) { |
| 3628 | SmallString<16> CharBuffer; |
| 3629 | bool Invalid = false; |
| 3630 | StringRef ThisTok = PP.getSpelling(Tok, CharBuffer, &Invalid); |
| 3631 | if (Invalid) |
| 3632 | return ExprError(); |
| 3633 | |
| 3634 | CharLiteralParser Literal(ThisTok.begin(), ThisTok.end(), Tok.getLocation(), |
| 3635 | PP, Tok.getKind()); |
| 3636 | if (Literal.hadError()) |
| 3637 | return ExprError(); |
| 3638 | |
| 3639 | QualType Ty; |
| 3640 | if (Literal.isWide()) |
| 3641 | Ty = Context.WideCharTy; // L'x' -> wchar_t in C and C++. |
| 3642 | else if (Literal.isUTF8() && getLangOpts().C2x) |
| 3643 | Ty = Context.UnsignedCharTy; // u8'x' -> unsigned char in C2x |
| 3644 | else if (Literal.isUTF8() && getLangOpts().Char8) |
| 3645 | Ty = Context.Char8Ty; // u8'x' -> char8_t when it exists. |
| 3646 | else if (Literal.isUTF16()) |
| 3647 | Ty = Context.Char16Ty; // u'x' -> char16_t in C11 and C++11. |
| 3648 | else if (Literal.isUTF32()) |
| 3649 | Ty = Context.Char32Ty; // U'x' -> char32_t in C11 and C++11. |
| 3650 | else if (!getLangOpts().CPlusPlus || Literal.isMultiChar()) |
| 3651 | Ty = Context.IntTy; // 'x' -> int in C, 'wxyz' -> int in C++. |
| 3652 | else |
| 3653 | Ty = Context.CharTy; // 'x' -> char in C++; |
| 3654 | // u8'x' -> char in C11-C17 and in C++ without char8_t. |
| 3655 | |
| 3656 | CharacterLiteral::CharacterKind Kind = CharacterLiteral::Ascii; |
| 3657 | if (Literal.isWide()) |
| 3658 | Kind = CharacterLiteral::Wide; |
| 3659 | else if (Literal.isUTF16()) |
| 3660 | Kind = CharacterLiteral::UTF16; |
| 3661 | else if (Literal.isUTF32()) |
| 3662 | Kind = CharacterLiteral::UTF32; |
| 3663 | else if (Literal.isUTF8()) |
| 3664 | Kind = CharacterLiteral::UTF8; |
| 3665 | |
| 3666 | Expr *Lit = new (Context) CharacterLiteral(Literal.getValue(), Kind, Ty, |
| 3667 | Tok.getLocation()); |
| 3668 | |
| 3669 | if (Literal.getUDSuffix().empty()) |
| 3670 | return Lit; |
| 3671 | |
| 3672 | // We're building a user-defined literal. |
| 3673 | IdentifierInfo *UDSuffix = &Context.Idents.get(Literal.getUDSuffix()); |
| 3674 | SourceLocation UDSuffixLoc = |
| 3675 | getUDSuffixLoc(*this, Tok.getLocation(), Literal.getUDSuffixOffset()); |
| 3676 | |
| 3677 | // Make sure we're allowed user-defined literals here. |
| 3678 | if (!UDLScope) |
| 3679 | return ExprError(Diag(UDSuffixLoc, diag::err_invalid_character_udl)); |
| 3680 | |
| 3681 | // C++11 [lex.ext]p6: The literal L is treated as a call of the form |
| 3682 | // operator "" X (ch) |
| 3683 | return BuildCookedLiteralOperatorCall(*this, UDLScope, UDSuffix, UDSuffixLoc, |
| 3684 | Lit, Tok.getLocation()); |
| 3685 | } |
| 3686 | |
| 3687 | ExprResult Sema::ActOnIntegerConstant(SourceLocation Loc, uint64_t Val) { |
| 3688 | unsigned IntSize = Context.getTargetInfo().getIntWidth(); |
| 3689 | return IntegerLiteral::Create(Context, llvm::APInt(IntSize, Val), |
| 3690 | Context.IntTy, Loc); |
| 3691 | } |
| 3692 | |
| 3693 | static Expr *BuildFloatingLiteral(Sema &S, NumericLiteralParser &Literal, |
| 3694 | QualType Ty, SourceLocation Loc) { |
| 3695 | const llvm::fltSemantics &Format = S.Context.getFloatTypeSemantics(Ty); |
| 3696 | |
| 3697 | using llvm::APFloat; |
| 3698 | APFloat Val(Format); |
| 3699 | |
| 3700 | APFloat::opStatus result = Literal.GetFloatValue(Val); |
| 3701 | |
| 3702 | // Overflow is always an error, but underflow is only an error if |
| 3703 | // we underflowed to zero (APFloat reports denormals as underflow). |
| 3704 | if ((result & APFloat::opOverflow) || |
| 3705 | ((result & APFloat::opUnderflow) && Val.isZero())) { |
| 3706 | unsigned diagnostic; |
| 3707 | SmallString<20> buffer; |
| 3708 | if (result & APFloat::opOverflow) { |
| 3709 | diagnostic = diag::warn_float_overflow; |
| 3710 | APFloat::getLargest(Format).toString(buffer); |
| 3711 | } else { |
| 3712 | diagnostic = diag::warn_float_underflow; |
| 3713 | APFloat::getSmallest(Format).toString(buffer); |
| 3714 | } |
| 3715 | |
| 3716 | S.Diag(Loc, diagnostic) |
| 3717 | << Ty |
| 3718 | << StringRef(buffer.data(), buffer.size()); |
| 3719 | } |
| 3720 | |
| 3721 | bool isExact = (result == APFloat::opOK); |
| 3722 | return FloatingLiteral::Create(S.Context, Val, isExact, Ty, Loc); |
| 3723 | } |
| 3724 | |
| 3725 | bool Sema::CheckLoopHintExpr(Expr *E, SourceLocation Loc) { |
| 3726 | assert(E && "Invalid expression")(static_cast <bool> (E && "Invalid expression") ? void (0) : __assert_fail ("E && \"Invalid expression\"" , "clang/lib/Sema/SemaExpr.cpp", 3726, __extension__ __PRETTY_FUNCTION__ )); |
| 3727 | |
| 3728 | if (E->isValueDependent()) |
| 3729 | return false; |
| 3730 | |
| 3731 | QualType QT = E->getType(); |
| 3732 | if (!QT->isIntegerType() || QT->isBooleanType() || QT->isCharType()) { |
| 3733 | Diag(E->getExprLoc(), diag::err_pragma_loop_invalid_argument_type) << QT; |
| 3734 | return true; |
| 3735 | } |
| 3736 | |
| 3737 | llvm::APSInt ValueAPS; |
| 3738 | ExprResult R = VerifyIntegerConstantExpression(E, &ValueAPS); |
| 3739 | |
| 3740 | if (R.isInvalid()) |
| 3741 | return true; |
| 3742 | |
| 3743 | bool ValueIsPositive = ValueAPS.isStrictlyPositive(); |
| 3744 | if (!ValueIsPositive || ValueAPS.getActiveBits() > 31) { |
| 3745 | Diag(E->getExprLoc(), diag::err_pragma_loop_invalid_argument_value) |
| 3746 | << toString(ValueAPS, 10) << ValueIsPositive; |
| 3747 | return true; |
| 3748 | } |
| 3749 | |
| 3750 | return false; |
| 3751 | } |
| 3752 | |
| 3753 | ExprResult Sema::ActOnNumericConstant(const Token &Tok, Scope *UDLScope) { |
| 3754 | // Fast path for a single digit (which is quite common). A single digit |
| 3755 | // cannot have a trigraph, escaped newline, radix prefix, or suffix. |
| 3756 | if (Tok.getLength() == 1) { |
| 3757 | const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); |
| 3758 | return ActOnIntegerConstant(Tok.getLocation(), Val-'0'); |
| 3759 | } |
| 3760 | |
| 3761 | SmallString<128> SpellingBuffer; |
| 3762 | // NumericLiteralParser wants to overread by one character. Add padding to |
| 3763 | // the buffer in case the token is copied to the buffer. If getSpelling() |
| 3764 | // returns a StringRef to the memory buffer, it should have a null char at |
| 3765 | // the EOF, so it is also safe. |
| 3766 | SpellingBuffer.resize(Tok.getLength() + 1); |
| 3767 | |
| 3768 | // Get the spelling of the token, which eliminates trigraphs, etc. |
| 3769 | bool Invalid = false; |
| 3770 | StringRef TokSpelling = PP.getSpelling(Tok, SpellingBuffer, &Invalid); |
| 3771 | if (Invalid) |
| 3772 | return ExprError(); |
| 3773 | |
| 3774 | NumericLiteralParser Literal(TokSpelling, Tok.getLocation(), |
| 3775 | PP.getSourceManager(), PP.getLangOpts(), |
| 3776 | PP.getTargetInfo(), PP.getDiagnostics()); |
| 3777 | if (Literal.hadError) |
| 3778 | return ExprError(); |
| 3779 | |
| 3780 | if (Literal.hasUDSuffix()) { |
| 3781 | // We're building a user-defined literal. |
| 3782 | IdentifierInfo *UDSuffix = &Context.Idents.get(Literal.getUDSuffix()); |
| 3783 | SourceLocation UDSuffixLoc = |
| 3784 | getUDSuffixLoc(*this, Tok.getLocation(), Literal.getUDSuffixOffset()); |
| 3785 | |
| 3786 | // Make sure we're allowed user-defined literals here. |
| 3787 | if (!UDLScope) |
| 3788 | return ExprError(Diag(UDSuffixLoc, diag::err_invalid_numeric_udl)); |
| 3789 | |
| 3790 | QualType CookedTy; |
| 3791 | if (Literal.isFloatingLiteral()) { |
| 3792 | // C++11 [lex.ext]p4: If S contains a literal operator with parameter type |
| 3793 | // long double, the literal is treated as a call of the form |
| 3794 | // operator "" X (f L) |
| 3795 | CookedTy = Context.LongDoubleTy; |
| 3796 | } else { |
| 3797 | // C++11 [lex.ext]p3: If S contains a literal operator with parameter type |
| 3798 | // unsigned long long, the literal is treated as a call of the form |
| 3799 | // operator "" X (n ULL) |
| 3800 | CookedTy = Context.UnsignedLongLongTy; |
| 3801 | } |
| 3802 | |
| 3803 | DeclarationName OpName = |
| 3804 | Context.DeclarationNames.getCXXLiteralOperatorName(UDSuffix); |
| 3805 | DeclarationNameInfo OpNameInfo(OpName, UDSuffixLoc); |
| 3806 | OpNameInfo.setCXXLiteralOperatorNameLoc(UDSuffixLoc); |
| 3807 | |
| 3808 | SourceLocation TokLoc = Tok.getLocation(); |
| 3809 | |
| 3810 | // Perform literal operator lookup to determine if we're building a raw |
| 3811 | // literal or a cooked one. |
| 3812 | LookupResult R(*this, OpName, UDSuffixLoc, LookupOrdinaryName); |
| 3813 | switch (LookupLiteralOperator(UDLScope, R, CookedTy, |
| 3814 | /*AllowRaw*/ true, /*AllowTemplate*/ true, |
| 3815 | /*AllowStringTemplatePack*/ false, |
| 3816 | /*DiagnoseMissing*/ !Literal.isImaginary)) { |
| 3817 | case LOLR_ErrorNoDiagnostic: |
| 3818 | // Lookup failure for imaginary constants isn't fatal, there's still the |
| 3819 | // GNU extension producing _Complex types. |
| 3820 | break; |
| 3821 | case LOLR_Error: |
| 3822 | return ExprError(); |
| 3823 | case LOLR_Cooked: { |
| 3824 | Expr *Lit; |
| 3825 | if (Literal.isFloatingLiteral()) { |
| 3826 | Lit = BuildFloatingLiteral(*this, Literal, CookedTy, Tok.getLocation()); |
| 3827 | } else { |
| 3828 | llvm::APInt ResultVal(Context.getTargetInfo().getLongLongWidth(), 0); |
| 3829 | if (Literal.GetIntegerValue(ResultVal)) |
| 3830 | Diag(Tok.getLocation(), diag::err_integer_literal_too_large) |
| 3831 | << /* Unsigned */ 1; |
| 3832 | Lit = IntegerLiteral::Create(Context, ResultVal, CookedTy, |
| 3833 | Tok.getLocation()); |
| 3834 | } |
| 3835 | return BuildLiteralOperatorCall(R, OpNameInfo, Lit, TokLoc); |
| 3836 | } |
| 3837 | |
| 3838 | case LOLR_Raw: { |
| 3839 | // C++11 [lit.ext]p3, p4: If S contains a raw literal operator, the |
| 3840 | // literal is treated as a call of the form |
| 3841 | // operator "" X ("n") |
| 3842 | unsigned Length = Literal.getUDSuffixOffset(); |
| 3843 | QualType StrTy = Context.getConstantArrayType( |
| 3844 | Context.adjustStringLiteralBaseType(Context.CharTy.withConst()), |
| 3845 | llvm::APInt(32, Length + 1), nullptr, ArrayType::Normal, 0); |
| 3846 | Expr *Lit = |
| 3847 | StringLiteral::Create(Context, StringRef(TokSpelling.data(), Length), |
| 3848 | StringLiteral::Ordinary, |
| 3849 | /*Pascal*/ false, StrTy, &TokLoc, 1); |
| 3850 | return BuildLiteralOperatorCall(R, OpNameInfo, Lit, TokLoc); |
| 3851 | } |
| 3852 | |
| 3853 | case LOLR_Template: { |
| 3854 | // C++11 [lit.ext]p3, p4: Otherwise (S contains a literal operator |
| 3855 | // template), L is treated as a call fo the form |
| 3856 | // operator "" X <'c1', 'c2', ... 'ck'>() |
| 3857 | // where n is the source character sequence c1 c2 ... ck. |
| 3858 | TemplateArgumentListInfo ExplicitArgs; |
| 3859 | unsigned CharBits = Context.getIntWidth(Context.CharTy); |
| 3860 | bool CharIsUnsigned = Context.CharTy->isUnsignedIntegerType(); |
| 3861 | llvm::APSInt Value(CharBits, CharIsUnsigned); |
| 3862 | for (unsigned I = 0, N = Literal.getUDSuffixOffset(); I != N; ++I) { |
| 3863 | Value = TokSpelling[I]; |
| 3864 | TemplateArgument Arg(Context, Value, Context.CharTy); |
| 3865 | TemplateArgumentLocInfo ArgInfo; |
| 3866 | ExplicitArgs.addArgument(TemplateArgumentLoc(Arg, ArgInfo)); |
| 3867 | } |
| 3868 | return BuildLiteralOperatorCall(R, OpNameInfo, std::nullopt, TokLoc, |
| 3869 | &ExplicitArgs); |
| 3870 | } |
| 3871 | case LOLR_StringTemplatePack: |
| 3872 | llvm_unreachable("unexpected literal operator lookup result")::llvm::llvm_unreachable_internal("unexpected literal operator lookup result" , "clang/lib/Sema/SemaExpr.cpp", 3872); |
| 3873 | } |
| 3874 | } |
| 3875 | |
| 3876 | Expr *Res; |
| 3877 | |
| 3878 | if (Literal.isFixedPointLiteral()) { |
| 3879 | QualType Ty; |
| 3880 | |
| 3881 | if (Literal.isAccum) { |
| 3882 | if (Literal.isHalf) { |
| 3883 | Ty = Context.ShortAccumTy; |
| 3884 | } else if (Literal.isLong) { |
| 3885 | Ty = Context.LongAccumTy; |
| 3886 | } else { |
| 3887 | Ty = Context.AccumTy; |
| 3888 | } |
| 3889 | } else if (Literal.isFract) { |
| 3890 | if (Literal.isHalf) { |
| 3891 | Ty = Context.ShortFractTy; |
| 3892 | } else if (Literal.isLong) { |
| 3893 | Ty = Context.LongFractTy; |
| 3894 | } else { |
| 3895 | Ty = Context.FractTy; |
| 3896 | } |
| 3897 | } |
| 3898 | |
| 3899 | if (Literal.isUnsigned) Ty = Context.getCorrespondingUnsignedType(Ty); |
| 3900 | |
| 3901 | bool isSigned = !Literal.isUnsigned; |
| 3902 | unsigned scale = Context.getFixedPointScale(Ty); |
| 3903 | unsigned bit_width = Context.getTypeInfo(Ty).Width; |
| 3904 | |
| 3905 | llvm::APInt Val(bit_width, 0, isSigned); |
| 3906 | bool Overflowed = Literal.GetFixedPointValue(Val, scale); |
| 3907 | bool ValIsZero = Val.isZero() && !Overflowed; |
| 3908 | |
| 3909 | auto MaxVal = Context.getFixedPointMax(Ty).getValue(); |
| 3910 | if (Literal.isFract && Val == MaxVal + 1 && !ValIsZero) |
| 3911 | // Clause 6.4.4 - The value of a constant shall be in the range of |
| 3912 | // representable values for its type, with exception for constants of a |
| 3913 | // fract type with a value of exactly 1; such a constant shall denote |
| 3914 | // the maximal value for the type. |
| 3915 | --Val; |
| 3916 | else if (Val.ugt(MaxVal) || Overflowed) |
| 3917 | Diag(Tok.getLocation(), diag::err_too_large_for_fixed_point); |
| 3918 | |
| 3919 | Res = FixedPointLiteral::CreateFromRawInt(Context, Val, Ty, |
| 3920 | Tok.getLocation(), scale); |
| 3921 | } else if (Literal.isFloatingLiteral()) { |
| 3922 | QualType Ty; |
| 3923 | if (Literal.isHalf){ |
| 3924 | if (getOpenCLOptions().isAvailableOption("cl_khr_fp16", getLangOpts())) |
| 3925 | Ty = Context.HalfTy; |
| 3926 | else { |
| 3927 | Diag(Tok.getLocation(), diag::err_half_const_requires_fp16); |
| 3928 | return ExprError(); |
| 3929 | } |
| 3930 | } else if (Literal.isFloat) |
| 3931 | Ty = Context.FloatTy; |
| 3932 | else if (Literal.isLong) |
| 3933 | Ty = Context.LongDoubleTy; |
| 3934 | else if (Literal.isFloat16) |
| 3935 | Ty = Context.Float16Ty; |
| 3936 | else if (Literal.isFloat128) |
| 3937 | Ty = Context.Float128Ty; |
| 3938 | else |
| 3939 | Ty = Context.DoubleTy; |
| 3940 | |
| 3941 | Res = BuildFloatingLiteral(*this, Literal, Ty, Tok.getLocation()); |
| 3942 | |
| 3943 | if (Ty == Context.DoubleTy) { |
| 3944 | if (getLangOpts().SinglePrecisionConstants) { |
| 3945 | if (Ty->castAs<BuiltinType>()->getKind() != BuiltinType::Float) { |
| 3946 | Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).get(); |
| 3947 | } |
| 3948 | } else if (getLangOpts().OpenCL && !getOpenCLOptions().isAvailableOption( |
| 3949 | "cl_khr_fp64", getLangOpts())) { |
| 3950 | // Impose single-precision float type when cl_khr_fp64 is not enabled. |
| 3951 | Diag(Tok.getLocation(), diag::warn_double_const_requires_fp64) |
| 3952 | << (getLangOpts().getOpenCLCompatibleVersion() >= 300); |
| 3953 | Res = ImpCastExprToType(Res, Context.FloatTy, CK_FloatingCast).get(); |
| 3954 | } |
| 3955 | } |
| 3956 | } else if (!Literal.isIntegerLiteral()) { |
| 3957 | return ExprError(); |
| 3958 | } else { |
| 3959 | QualType Ty; |
| 3960 | |
| 3961 | // 'z/uz' literals are a C++2b feature. |
| 3962 | if (Literal.isSizeT) |
| 3963 | Diag(Tok.getLocation(), getLangOpts().CPlusPlus |
| 3964 | ? getLangOpts().CPlusPlus2b |
| 3965 | ? diag::warn_cxx20_compat_size_t_suffix |
| 3966 | : diag::ext_cxx2b_size_t_suffix |
| 3967 | : diag::err_cxx2b_size_t_suffix); |
| 3968 | |
| 3969 | // 'wb/uwb' literals are a C2x feature. We support _BitInt as a type in C++, |
| 3970 | // but we do not currently support the suffix in C++ mode because it's not |
| 3971 | // entirely clear whether WG21 will prefer this suffix to return a library |
| 3972 | // type such as std::bit_int instead of returning a _BitInt. |
| 3973 | if (Literal.isBitInt && !getLangOpts().CPlusPlus) |
| 3974 | PP.Diag(Tok.getLocation(), getLangOpts().C2x |
| 3975 | ? diag::warn_c2x_compat_bitint_suffix |
| 3976 | : diag::ext_c2x_bitint_suffix); |
| 3977 | |
| 3978 | // Get the value in the widest-possible width. What is "widest" depends on |
| 3979 | // whether the literal is a bit-precise integer or not. For a bit-precise |
| 3980 | // integer type, try to scan the source to determine how many bits are |
| 3981 | // needed to represent the value. This may seem a bit expensive, but trying |
| 3982 | // to get the integer value from an overly-wide APInt is *extremely* |
| 3983 | // expensive, so the naive approach of assuming |
| 3984 | // llvm::IntegerType::MAX_INT_BITS is a big performance hit. |
| 3985 | unsigned BitsNeeded = |
| 3986 | Literal.isBitInt ? llvm::APInt::getSufficientBitsNeeded( |
| 3987 | Literal.getLiteralDigits(), Literal.getRadix()) |
| 3988 | : Context.getTargetInfo().getIntMaxTWidth(); |
| 3989 | llvm::APInt ResultVal(BitsNeeded, 0); |
| 3990 | |
| 3991 | if (Literal.GetIntegerValue(ResultVal)) { |
| 3992 | // If this value didn't fit into uintmax_t, error and force to ull. |
| 3993 | Diag(Tok.getLocation(), diag::err_integer_literal_too_large) |
| 3994 | << /* Unsigned */ 1; |
| 3995 | Ty = Context.UnsignedLongLongTy; |
| 3996 | assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() &&(static_cast <bool> (Context.getTypeSize(Ty) == ResultVal .getBitWidth() && "long long is not intmax_t?") ? void (0) : __assert_fail ("Context.getTypeSize(Ty) == ResultVal.getBitWidth() && \"long long is not intmax_t?\"" , "clang/lib/Sema/SemaExpr.cpp", 3997, __extension__ __PRETTY_FUNCTION__ )) |
| 3997 | "long long is not intmax_t?")(static_cast <bool> (Context.getTypeSize(Ty) == ResultVal .getBitWidth() && "long long is not intmax_t?") ? void (0) : __assert_fail ("Context.getTypeSize(Ty) == ResultVal.getBitWidth() && \"long long is not intmax_t?\"" , "clang/lib/Sema/SemaExpr.cpp", 3997, __extension__ __PRETTY_FUNCTION__ )); |
| 3998 | } else { |
| 3999 | // If this value fits into a ULL, try to figure out what else it fits into |
| 4000 | // according to the rules of C99 6.4.4.1p5. |
| 4001 | |
| 4002 | // Octal, Hexadecimal, and integers with a U suffix are allowed to |
| 4003 | // be an unsigned int. |
| 4004 | bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; |
| 4005 | |
| 4006 | // Check from smallest to largest, picking the smallest type we can. |
| 4007 | unsigned Width = 0; |
| 4008 | |
| 4009 | // Microsoft specific integer suffixes are explicitly sized. |
| 4010 | if (Literal.MicrosoftInteger) { |
| 4011 | if (Literal.MicrosoftInteger == 8 && !Literal.isUnsigned) { |
| 4012 | Width = 8; |
| 4013 | Ty = Context.CharTy; |
| 4014 | } else { |
| 4015 | Width = Literal.MicrosoftInteger; |
| 4016 | Ty = Context.getIntTypeForBitwidth(Width, |
| 4017 | /*Signed=*/!Literal.isUnsigned); |
| 4018 | } |
| 4019 | } |
| 4020 | |
| 4021 | // Bit-precise integer literals are automagically-sized based on the |
| 4022 | // width required by the literal. |
| 4023 | if (Literal.isBitInt) { |
| 4024 | // The signed version has one more bit for the sign value. There are no |
| 4025 | // zero-width bit-precise integers, even if the literal value is 0. |
| 4026 | Width = std::max(ResultVal.getActiveBits(), 1u) + |
| 4027 | (Literal.isUnsigned ? 0u : 1u); |
| 4028 | |
| 4029 | // Diagnose if the width of the constant is larger than BITINT_MAXWIDTH, |
| 4030 | // and reset the type to the largest supported width. |
| 4031 | unsigned int MaxBitIntWidth = |
| 4032 | Context.getTargetInfo().getMaxBitIntWidth(); |
| 4033 | if (Width > MaxBitIntWidth) { |
| 4034 | Diag(Tok.getLocation(), diag::err_integer_literal_too_large) |
| 4035 | << Literal.isUnsigned; |
| 4036 | Width = MaxBitIntWidth; |
| 4037 | } |
| 4038 | |
| 4039 | // Reset the result value to the smaller APInt and select the correct |
| 4040 | // type to be used. Note, we zext even for signed values because the |
| 4041 | // literal itself is always an unsigned value (a preceeding - is a |
| 4042 | // unary operator, not part of the literal). |
| 4043 | ResultVal = ResultVal.zextOrTrunc(Width); |
| 4044 | Ty = Context.getBitIntType(Literal.isUnsigned, Width); |
| 4045 | } |
| 4046 | |
| 4047 | // Check C++2b size_t literals. |
| 4048 | if (Literal.isSizeT) { |
| 4049 | assert(!Literal.MicrosoftInteger &&(static_cast <bool> (!Literal.MicrosoftInteger && "size_t literals can't be Microsoft literals") ? void (0) : __assert_fail ("!Literal.MicrosoftInteger && \"size_t literals can't be Microsoft literals\"" , "clang/lib/Sema/SemaExpr.cpp", 4050, __extension__ __PRETTY_FUNCTION__ )) |
| 4050 | "size_t literals can't be Microsoft literals")(static_cast <bool> (!Literal.MicrosoftInteger && "size_t literals can't be Microsoft literals") ? void (0) : __assert_fail ("!Literal.MicrosoftInteger && \"size_t literals can't be Microsoft literals\"" , "clang/lib/Sema/SemaExpr.cpp", 4050, __extension__ __PRETTY_FUNCTION__ )); |
| 4051 | unsigned SizeTSize = Context.getTargetInfo().getTypeWidth( |
| 4052 | Context.getTargetInfo().getSizeType()); |
| 4053 | |
| 4054 | // Does it fit in size_t? |
| 4055 | if (ResultVal.isIntN(SizeTSize)) { |
| 4056 | // Does it fit in ssize_t? |
| 4057 | if (!Literal.isUnsigned && ResultVal[SizeTSize - 1] == 0) |
| 4058 | Ty = Context.getSignedSizeType(); |
| 4059 | else if (AllowUnsigned) |
| 4060 | Ty = Context.getSizeType(); |
| 4061 | Width = SizeTSize; |
| 4062 | } |
| 4063 | } |
| 4064 | |
| 4065 | if (Ty.isNull() && !Literal.isLong && !Literal.isLongLong && |
| 4066 | !Literal.isSizeT) { |
| 4067 | // Are int/unsigned possibilities? |
| 4068 | unsigned IntSize = Context.getTargetInfo().getIntWidth(); |
| 4069 | |
| 4070 | // Does it fit in a unsigned int? |
| 4071 | if (ResultVal.isIntN(IntSize)) { |
| 4072 | // Does it fit in a signed int? |
| 4073 | if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) |
| 4074 | Ty = Context.IntTy; |
| 4075 | else if (AllowUnsigned) |
| 4076 | Ty = Context.UnsignedIntTy; |
| 4077 | Width = IntSize; |
| 4078 | } |
| 4079 | } |
| 4080 | |
| 4081 | // Are long/unsigned long possibilities? |
| 4082 | if (Ty.isNull() && !Literal.isLongLong && !Literal.isSizeT) { |
| 4083 | unsigned LongSize = Context.getTargetInfo().getLongWidth(); |
| 4084 | |
| 4085 | // Does it fit in a unsigned long? |
| 4086 | if (ResultVal.isIntN(LongSize)) { |
| 4087 | // Does it fit in a signed long? |
| 4088 | if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) |
| 4089 | Ty = Context.LongTy; |
| 4090 | else if (AllowUnsigned) |
| 4091 | Ty = Context.UnsignedLongTy; |
| 4092 | // Check according to the rules of C90 6.1.3.2p5. C++03 [lex.icon]p2 |
| 4093 | // is compatible. |
| 4094 | else if (!getLangOpts().C99 && !getLangOpts().CPlusPlus11) { |
| 4095 | const unsigned LongLongSize = |
| 4096 | Context.getTargetInfo().getLongLongWidth(); |
| 4097 | Diag(Tok.getLocation(), |
| 4098 | getLangOpts().CPlusPlus |
| 4099 | ? Literal.isLong |
| 4100 | ? diag::warn_old_implicitly_unsigned_long_cxx |
| 4101 | : /*C++98 UB*/ diag:: |
| 4102 | ext_old_implicitly_unsigned_long_cxx |
| 4103 | : diag::warn_old_implicitly_unsigned_long) |
| 4104 | << (LongLongSize > LongSize ? /*will have type 'long long'*/ 0 |
| 4105 | : /*will be ill-formed*/ 1); |
| 4106 | Ty = Context.UnsignedLongTy; |
| 4107 | } |
| 4108 | Width = LongSize; |
| 4109 | } |
| 4110 | } |
| 4111 | |
| 4112 | // Check long long if needed. |
| 4113 | if (Ty.isNull() && !Literal.isSizeT) { |
| 4114 | unsigned LongLongSize = Context.getTargetInfo().getLongLongWidth(); |
| 4115 | |
| 4116 | // Does it fit in a unsigned long long? |
| 4117 | if (ResultVal.isIntN(LongLongSize)) { |
| 4118 | // Does it fit in a signed long long? |
| 4119 | // To be compatible with MSVC, hex integer literals ending with the |
| 4120 | // LL or i64 suffix are always signed in Microsoft mode. |
| 4121 | if (!Literal.isUnsigned && (ResultVal[LongLongSize-1] == 0 || |
| 4122 | (getLangOpts().MSVCCompat && Literal.isLongLong))) |
| 4123 | Ty = Context.LongLongTy; |
| 4124 | else if (AllowUnsigned) |
| 4125 | Ty = Context.UnsignedLongLongTy; |
| 4126 | Width = LongLongSize; |
| 4127 | |
| 4128 | // 'long long' is a C99 or C++11 feature, whether the literal |
| 4129 | // explicitly specified 'long long' or we needed the extra width. |
| 4130 | if (getLangOpts().CPlusPlus) |
| 4131 | Diag(Tok.getLocation(), getLangOpts().CPlusPlus11 |
| 4132 | ? diag::warn_cxx98_compat_longlong |
| 4133 | : diag::ext_cxx11_longlong); |
| 4134 | else if (!getLangOpts().C99) |
| 4135 | Diag(Tok.getLocation(), diag::ext_c99_longlong); |
| 4136 | } |
| 4137 | } |
| 4138 | |
| 4139 | // If we still couldn't decide a type, we either have 'size_t' literal |
| 4140 | // that is out of range, or a decimal literal that does not fit in a |
| 4141 | // signed long long and has no U suffix. |
| 4142 | if (Ty.isNull()) { |
| 4143 | if (Literal.isSizeT) |
| 4144 | Diag(Tok.getLocation(), diag::err_size_t_literal_too_large) |
| 4145 | << Literal.isUnsigned; |
| 4146 | else |
| 4147 | Diag(Tok.getLocation(), |
| 4148 | diag::ext_integer_literal_too_large_for_signed); |
| 4149 | Ty = Context.UnsignedLongLongTy; |
| 4150 | Width = Context.getTargetInfo().getLongLongWidth(); |
| 4151 | } |
| 4152 | |
| 4153 | if (ResultVal.getBitWidth() != Width) |
| 4154 | ResultVal = ResultVal.trunc(Width); |
| 4155 | } |
| 4156 | Res = IntegerLiteral::Create(Context, ResultVal, Ty, Tok.getLocation()); |
| 4157 | } |
| 4158 | |
| 4159 | // If this is an imaginary literal, create the ImaginaryLiteral wrapper. |
| 4160 | if (Literal.isImaginary) { |
| 4161 | Res = new (Context) ImaginaryLiteral(Res, |
| 4162 | Context.getComplexType(Res->getType())); |
| 4163 | |
| 4164 | Diag(Tok.getLocation(), diag::ext_imaginary_constant); |
| 4165 | } |
| 4166 | return Res; |
| 4167 | } |
| 4168 | |
| 4169 | ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, Expr *E) { |
| 4170 | assert(E && "ActOnParenExpr() missing expr")(static_cast <bool> (E && "ActOnParenExpr() missing expr" ) ? void (0) : __assert_fail ("E && \"ActOnParenExpr() missing expr\"" , "clang/lib/Sema/SemaExpr.cpp", 4170, __extension__ __PRETTY_FUNCTION__ )); |
| 4171 | QualType ExprTy = E->getType(); |
| 4172 | if (getLangOpts().ProtectParens && CurFPFeatures.getAllowFPReassociate() && |
| 4173 | !E->isLValue() && ExprTy->hasFloatingRepresentation()) |
| 4174 | return BuildBuiltinCallExpr(R, Builtin::BI__arithmetic_fence, E); |
| 4175 | return new (Context) ParenExpr(L, R, E); |
| 4176 | } |
| 4177 | |
| 4178 | static bool CheckVecStepTraitOperandType(Sema &S, QualType T, |
| 4179 | SourceLocation Loc, |
| 4180 | SourceRange ArgRange) { |
| 4181 | // [OpenCL 1.1 6.11.12] "The vec_step built-in function takes a built-in |
| 4182 | // scalar or vector data type argument..." |
| 4183 | // Every built-in scalar type (OpenCL 1.1 6.1.1) is either an arithmetic |
| 4184 | // type (C99 6.2.5p18) or void. |
| 4185 | if (!(T->isArithmeticType() || T->isVoidType() || T->isVectorType())) { |
| 4186 | S.Diag(Loc, diag::err_vecstep_non_scalar_vector_type) |
| 4187 | << T << ArgRange; |
| 4188 | return true; |
| 4189 | } |
| 4190 | |
| 4191 | assert((T->isVoidType() || !T->isIncompleteType()) &&(static_cast <bool> ((T->isVoidType() || !T->isIncompleteType ()) && "Scalar types should always be complete") ? void (0) : __assert_fail ("(T->isVoidType() || !T->isIncompleteType()) && \"Scalar types should always be complete\"" , "clang/lib/Sema/SemaExpr.cpp", 4192, __extension__ __PRETTY_FUNCTION__ )) |
| 4192 | "Scalar types should always be complete")(static_cast <bool> ((T->isVoidType() || !T->isIncompleteType ()) && "Scalar types should always be complete") ? void (0) : __assert_fail ("(T->isVoidType() || !T->isIncompleteType()) && \"Scalar types should always be complete\"" , "clang/lib/Sema/SemaExpr.cpp", 4192, __extension__ __PRETTY_FUNCTION__ )); |
| 4193 | return false; |
| 4194 | } |
| 4195 | |
| 4196 | static bool CheckExtensionTraitOperandType(Sema &S, QualType T, |
| 4197 | SourceLocation Loc, |
| 4198 | SourceRange ArgRange, |
| 4199 | UnaryExprOrTypeTrait TraitKind) { |
| 4200 | // Invalid types must be hard errors for SFINAE in C++. |
| 4201 | if (S.LangOpts.CPlusPlus) |
| 4202 | return true; |
| 4203 | |
| 4204 | // C99 6.5.3.4p1: |
| 4205 | if (T->isFunctionType() && |
| 4206 | (TraitKind == UETT_SizeOf || TraitKind == UETT_AlignOf || |
| 4207 | TraitKind == UETT_PreferredAlignOf)) { |
| 4208 | // sizeof(function)/alignof(function) is allowed as an extension. |
| 4209 | S.Diag(Loc, diag::ext_sizeof_alignof_function_type) |
| 4210 | << getTraitSpelling(TraitKind) << ArgRange; |
| 4211 | return false; |
| 4212 | } |
| 4213 | |
| 4214 | // Allow sizeof(void)/alignof(void) as an extension, unless in OpenCL where |
| 4215 | // this is an error (OpenCL v1.1 s6.3.k) |
| 4216 | if (T->isVoidType()) { |
| 4217 | unsigned DiagID = S.LangOpts.OpenCL ? diag::err_opencl_sizeof_alignof_type |
| 4218 | : diag::ext_sizeof_alignof_void_type; |
| 4219 | S.Diag(Loc, DiagID) << getTraitSpelling(TraitKind) << ArgRange; |
| 4220 | return false; |
| 4221 | } |
| 4222 | |
| 4223 | return true; |
| 4224 | } |
| 4225 | |
| 4226 | static bool CheckObjCTraitOperandConstraints(Sema &S, QualType T, |
| 4227 | SourceLocation Loc, |
| 4228 | SourceRange ArgRange, |
| 4229 | UnaryExprOrTypeTrait TraitKind) { |
| 4230 | // Reject sizeof(interface) and sizeof(interface<proto>) if the |
| 4231 | // runtime doesn't allow it. |
| 4232 | if (!S.LangOpts.ObjCRuntime.allowsSizeofAlignof() && T->isObjCObjectType()) { |
| 4233 | S.Diag(Loc, diag::err_sizeof_nonfragile_interface) |
| 4234 | << T << (TraitKind == UETT_SizeOf) |
| 4235 | << ArgRange; |
| 4236 | return true; |
| 4237 | } |
| 4238 | |
| 4239 | return false; |
| 4240 | } |
| 4241 | |
| 4242 | /// Check whether E is a pointer from a decayed array type (the decayed |
| 4243 | /// pointer type is equal to T) and emit a warning if it is. |
| 4244 | static void warnOnSizeofOnArrayDecay(Sema &S, SourceLocation Loc, QualType T, |
| 4245 | Expr *E) { |
| 4246 | // Don't warn if the operation changed the type. |
| 4247 | if (T != E->getType()) |
| 4248 | return; |
| 4249 | |
| 4250 | // Now look for array decays. |
| 4251 | ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E); |
| 4252 | if (!ICE || ICE->getCastKind() != CK_ArrayToPointerDecay) |
| 4253 | return; |
| 4254 | |
| 4255 | S.Diag(Loc, diag::warn_sizeof_array_decay) << ICE->getSourceRange() |
| 4256 | << ICE->getType() |
| 4257 | << ICE->getSubExpr()->getType(); |
| 4258 | } |
| 4259 | |
| 4260 | /// Check the constraints on expression operands to unary type expression |
| 4261 | /// and type traits. |
| 4262 | /// |
| 4263 | /// Completes any types necessary and validates the constraints on the operand |
| 4264 | /// expression. The logic mostly mirrors the type-based overload, but may modify |
| 4265 | /// the expression as it completes the type for that expression through template |
| 4266 | /// instantiation, etc. |
| 4267 | bool Sema::CheckUnaryExprOrTypeTraitOperand(Expr *E, |
| 4268 | UnaryExprOrTypeTrait ExprKind) { |
| 4269 | QualType ExprTy = E->getType(); |
| 4270 | assert(!ExprTy->isReferenceType())(static_cast <bool> (!ExprTy->isReferenceType()) ? void (0) : __assert_fail ("!ExprTy->isReferenceType()", "clang/lib/Sema/SemaExpr.cpp" , 4270, __extension__ __PRETTY_FUNCTION__)); |
| 4271 | |
| 4272 | bool IsUnevaluatedOperand = |
| 4273 | (ExprKind == UETT_SizeOf || ExprKind == UETT_AlignOf || |
| 4274 | ExprKind == UETT_PreferredAlignOf || ExprKind == UETT_VecStep); |
| 4275 | if (IsUnevaluatedOperand) { |
| 4276 | ExprResult Result = CheckUnevaluatedOperand(E); |
| 4277 | if (Result.isInvalid()) |
| 4278 | return true; |
| 4279 | E = Result.get(); |
| 4280 | } |
| 4281 | |
| 4282 | // The operand for sizeof and alignof is in an unevaluated expression context, |
| 4283 | // so side effects could result in unintended consequences. |
| 4284 | // Exclude instantiation-dependent expressions, because 'sizeof' is sometimes |
| 4285 | // used to build SFINAE gadgets. |
| 4286 | // FIXME: Should we consider instantiation-dependent operands to 'alignof'? |
| 4287 | if (IsUnevaluatedOperand && !inTemplateInstantiation() && |
| 4288 | !E->isInstantiationDependent() && |
| 4289 | !E->getType()->isVariableArrayType() && |
| 4290 | E->HasSideEffects(Context, false)) |
| 4291 | Diag(E->getExprLoc(), diag::warn_side_effects_unevaluated_context); |
| 4292 | |
| 4293 | if (ExprKind == UETT_VecStep) |
| 4294 | return CheckVecStepTraitOperandType(*this, ExprTy, E->getExprLoc(), |
| 4295 | E->getSourceRange()); |
| 4296 | |
| 4297 | // Explicitly list some types as extensions. |
| 4298 | if (!CheckExtensionTraitOperandType(*this, ExprTy, E->getExprLoc(), |
| 4299 | E->getSourceRange(), ExprKind)) |
| 4300 | return false; |
| 4301 | |
| 4302 | // 'alignof' applied to an expression only requires the base element type of |
| 4303 | // the expression to be complete. 'sizeof' requires the expression's type to |
| 4304 | // be complete (and will attempt to complete it if it's an array of unknown |
| 4305 | // bound). |
| 4306 | if (ExprKind == UETT_AlignOf || ExprKind == UETT_PreferredAlignOf) { |
| 4307 | if (RequireCompleteSizedType( |
| 4308 | E->getExprLoc(), Context.getBaseElementType(E->getType()), |
| 4309 | diag::err_sizeof_alignof_incomplete_or_sizeless_type, |
| 4310 | getTraitSpelling(ExprKind), E->getSourceRange())) |
| 4311 | return true; |
| 4312 | } else { |
| 4313 | if (RequireCompleteSizedExprType( |
| 4314 | E, diag::err_sizeof_alignof_incomplete_or_sizeless_type, |
| 4315 | getTraitSpelling(ExprKind), E->getSourceRange())) |
| 4316 | return true; |
| 4317 | } |
| 4318 | |
| 4319 | // Completing the expression's type may have changed it. |
| 4320 | ExprTy = E->getType(); |
| 4321 | assert(!ExprTy->isReferenceType())(static_cast <bool> (!ExprTy->isReferenceType()) ? void (0) : __assert_fail ("!ExprTy->isReferenceType()", "clang/lib/Sema/SemaExpr.cpp" , 4321, __extension__ __PRETTY_FUNCTION__)); |
| 4322 | |
| 4323 | if (ExprTy->isFunctionType()) { |
| 4324 | Diag(E->getExprLoc(), diag::err_sizeof_alignof_function_type) |
| 4325 | << getTraitSpelling(ExprKind) << E->getSourceRange(); |
| 4326 | return true; |
| 4327 | } |
| 4328 | |
| 4329 | if (CheckObjCTraitOperandConstraints(*this, ExprTy, E->getExprLoc(), |
| 4330 | E->getSourceRange(), ExprKind)) |
| 4331 | return true; |
| 4332 | |
| 4333 | if (ExprKind == UETT_SizeOf) { |
| 4334 | if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { |
| 4335 | if (ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(DeclRef->getFoundDecl())) { |
| 4336 | QualType OType = PVD->getOriginalType(); |
| 4337 | QualType Type = PVD->getType(); |
| 4338 | if (Type->isPointerType() && OType->isArrayType()) { |
| 4339 | Diag(E->getExprLoc(), diag::warn_sizeof_array_param) |
| 4340 | << Type << OType; |
| 4341 | Diag(PVD->getLocation(), diag::note_declared_at); |
| 4342 | } |
| 4343 | } |
| 4344 | } |
| 4345 | |
| 4346 | // Warn on "sizeof(array op x)" and "sizeof(x op array)", where the array |
| 4347 | // decays into a pointer and returns an unintended result. This is most |
| 4348 | // likely a typo for "sizeof(array) op x". |
| 4349 | if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E->IgnoreParens())) { |
| 4350 | warnOnSizeofOnArrayDecay(*this, BO->getOperatorLoc(), BO->getType(), |
| 4351 | BO->getLHS()); |
| 4352 | warnOnSizeofOnArrayDecay(*this, BO->getOperatorLoc(), BO->getType(), |
| 4353 | BO->getRHS()); |
| 4354 | } |
| 4355 | } |
| 4356 | |
| 4357 | return false; |
| 4358 | } |
| 4359 | |
| 4360 | /// Check the constraints on operands to unary expression and type |
| 4361 | /// traits. |
| 4362 | /// |
| 4363 | /// This will complete any types necessary, and validate the various constraints |
| 4364 | /// on those operands. |
| 4365 | /// |
| 4366 | /// The UsualUnaryConversions() function is *not* called by this routine. |
| 4367 | /// C99 6.3.2.1p[2-4] all state: |
| 4368 | /// Except when it is the operand of the sizeof operator ... |
| 4369 | /// |
| 4370 | /// C++ [expr.sizeof]p4 |
| 4371 | /// The lvalue-to-rvalue, array-to-pointer, and function-to-pointer |
| 4372 | /// standard conversions are not applied to the operand of sizeof. |
| 4373 | /// |
| 4374 | /// This policy is followed for all of the unary trait expressions. |
| 4375 | bool Sema::CheckUnaryExprOrTypeTraitOperand(QualType ExprType, |
| 4376 | SourceLocation OpLoc, |
| 4377 | SourceRange ExprRange, |
| 4378 | UnaryExprOrTypeTrait ExprKind) { |
| 4379 | if (ExprType->isDependentType()) |
| 4380 | return false; |
| 4381 | |
| 4382 | // C++ [expr.sizeof]p2: |
| 4383 | // When applied to a reference or a reference type, the result |
| 4384 | // is the size of the referenced type. |
| 4385 | // C++11 [expr.alignof]p3: |
| 4386 | // When alignof is applied to a reference type, the result |
| 4387 | // shall be the alignment of the referenced type. |
| 4388 | if (const ReferenceType *Ref = ExprType->getAs<ReferenceType>()) |
| 4389 | ExprType = Ref->getPointeeType(); |
| 4390 | |
| 4391 | // C11 6.5.3.4/3, C++11 [expr.alignof]p3: |
| 4392 | // When alignof or _Alignof is applied to an array type, the result |
| 4393 | // is the alignment of the element type. |
| 4394 | if (ExprKind == UETT_AlignOf || ExprKind == UETT_PreferredAlignOf || |
| 4395 | ExprKind == UETT_OpenMPRequiredSimdAlign) |
| 4396 | ExprType = Context.getBaseElementType(ExprType); |
| 4397 | |
| 4398 | if (ExprKind == UETT_VecStep) |
| 4399 | return CheckVecStepTraitOperandType(*this, ExprType, OpLoc, ExprRange); |
| 4400 | |
| 4401 | // Explicitly list some types as extensions. |
| 4402 | if (!CheckExtensionTraitOperandType(*this, ExprType, OpLoc, ExprRange, |
| 4403 | ExprKind)) |
| 4404 | return false; |
| 4405 | |
| 4406 | if (RequireCompleteSizedType( |
| 4407 | OpLoc, ExprType, diag::err_sizeof_alignof_incomplete_or_sizeless_type, |
| 4408 | getTraitSpelling(ExprKind), ExprRange)) |
| 4409 | return true; |
| 4410 | |
| 4411 | if (ExprType->isFunctionType()) { |
| 4412 | Diag(OpLoc, diag::err_sizeof_alignof_function_type) |
| 4413 | << getTraitSpelling(ExprKind) << ExprRange; |
| 4414 | return true; |
| 4415 | } |
| 4416 | |
| 4417 | if (CheckObjCTraitOperandConstraints(*this, ExprType, OpLoc, ExprRange, |
| 4418 | ExprKind)) |
| 4419 | return true; |
| 4420 | |
| 4421 | return false; |
| 4422 | } |
| 4423 | |
| 4424 | static bool CheckAlignOfExpr(Sema &S, Expr *E, UnaryExprOrTypeTrait ExprKind) { |
| 4425 | // Cannot know anything else if the expression is dependent. |
| 4426 | if (E->isTypeDependent()) |
| 4427 | return false; |
| 4428 | |
| 4429 | if (E->getObjectKind() == OK_BitField) { |
| 4430 | S.Diag(E->getExprLoc(), diag::err_sizeof_alignof_typeof_bitfield) |
| 4431 | << 1 << E->getSourceRange(); |
| 4432 | return true; |
| 4433 | } |
| 4434 | |
| 4435 | ValueDecl *D = nullptr; |
| 4436 | Expr *Inner = E->IgnoreParens(); |
| 4437 | if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Inner)) { |
| 4438 | D = DRE->getDecl(); |
| 4439 | } else if (MemberExpr *ME = dyn_cast<MemberExpr>(Inner)) { |
| 4440 | D = ME->getMemberDecl(); |
| 4441 | } |
| 4442 | |
| 4443 | // If it's a field, require the containing struct to have a |
| 4444 | // complete definition so that we can compute the layout. |
| 4445 | // |
| 4446 | // This can happen in C++11 onwards, either by naming the member |
| 4447 | // in a way that is not transformed into a member access expression |
| 4448 | // (in an unevaluated operand, for instance), or by naming the member |
| 4449 | // in a trailing-return-type. |
| 4450 | // |
| 4451 | // For the record, since __alignof__ on expressions is a GCC |
| 4452 | // extension, GCC seems to permit this but always gives the |
| 4453 | // nonsensical answer 0. |
| 4454 | // |
| 4455 | // We don't really need the layout here --- we could instead just |
| 4456 | // directly check for all the appropriate alignment-lowing |
| 4457 | // attributes --- but that would require duplicating a lot of |
| 4458 | // logic that just isn't worth duplicating for such a marginal |
| 4459 | // use-case. |
| 4460 | if (FieldDecl *FD = dyn_cast_or_null<FieldDecl>(D)) { |
| 4461 | // Fast path this check, since we at least know the record has a |
| 4462 | // definition if we can find a member of it. |
| 4463 | if (!FD->getParent()->isCompleteDefinition()) { |
| 4464 | S.Diag(E->getExprLoc(), diag::err_alignof_member_of_incomplete_type) |
| 4465 | << E->getSourceRange(); |
| 4466 | return true; |
| 4467 | } |
| 4468 | |
| 4469 | // Otherwise, if it's a field, and the field doesn't have |
| 4470 | // reference type, then it must have a complete type (or be a |
| 4471 | // flexible array member, which we explicitly want to |
| 4472 | // white-list anyway), which makes the following checks trivial. |
| 4473 | if (!FD->getType()->isReferenceType()) |
| 4474 | return false; |
| 4475 | } |
| 4476 | |
| 4477 | return S.CheckUnaryExprOrTypeTraitOperand(E, ExprKind); |
| 4478 | } |
| 4479 | |
| 4480 | bool Sema::CheckVecStepExpr(Expr *E) { |
| 4481 | E = E->IgnoreParens(); |
| 4482 | |
| 4483 | // Cannot know anything else if the expression is dependent. |
| 4484 | if (E->isTypeDependent()) |
| 4485 | return false; |
| 4486 | |
| 4487 | return CheckUnaryExprOrTypeTraitOperand(E, UETT_VecStep); |
| 4488 | } |
| 4489 | |
| 4490 | static void captureVariablyModifiedType(ASTContext &Context, QualType T, |
| 4491 | CapturingScopeInfo *CSI) { |
| 4492 | assert(T->isVariablyModifiedType())(static_cast <bool> (T->isVariablyModifiedType()) ? void (0) : __assert_fail ("T->isVariablyModifiedType()", "clang/lib/Sema/SemaExpr.cpp" , 4492, __extension__ __PRETTY_FUNCTION__)); |
| 4493 | assert(CSI != nullptr)(static_cast <bool> (CSI != nullptr) ? void (0) : __assert_fail ("CSI != nullptr", "clang/lib/Sema/SemaExpr.cpp", 4493, __extension__ __PRETTY_FUNCTION__)); |
| 4494 | |
| 4495 | // We're going to walk down into the type and look for VLA expressions. |
| 4496 | do { |
| 4497 | const Type *Ty = T.getTypePtr(); |
| 4498 | switch (Ty->getTypeClass()) { |
| 4499 | #define TYPE(Class, Base) |
| 4500 | #define ABSTRACT_TYPE(Class, Base) |
| 4501 | #define NON_CANONICAL_TYPE(Class, Base) |
| 4502 | #define DEPENDENT_TYPE(Class, Base) case Type::Class: |
| 4503 | #define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base) |
| 4504 | #include "clang/AST/TypeNodes.inc" |
| 4505 | T = QualType(); |
| 4506 | break; |
| 4507 | // These types are never variably-modified. |
| 4508 | case Type::Builtin: |
| 4509 | case Type::Complex: |
| 4510 | case Type::Vector: |
| 4511 | case Type::ExtVector: |
| 4512 | case Type::ConstantMatrix: |
| 4513 | case Type::Record: |
| 4514 | case Type::Enum: |
| 4515 | case Type::TemplateSpecialization: |
| 4516 | case Type::ObjCObject: |
| 4517 | case Type::ObjCInterface: |
| 4518 | case Type::ObjCObjectPointer: |
| 4519 | case Type::ObjCTypeParam: |
| 4520 | case Type::Pipe: |
| 4521 | case Type::BitInt: |
| 4522 | llvm_unreachable("type class is never variably-modified!")::llvm::llvm_unreachable_internal("type class is never variably-modified!" , "clang/lib/Sema/SemaExpr.cpp", 4522); |
| 4523 | case Type::Elaborated: |
| 4524 | T = cast<ElaboratedType>(Ty)->getNamedType(); |
| 4525 | break; |
| 4526 | case Type::Adjusted: |
| 4527 | T = cast<AdjustedType>(Ty)->getOriginalType(); |
| 4528 | break; |
| 4529 | case Type::Decayed: |
| 4530 | T = cast<DecayedType>(Ty)->getPointeeType(); |
| 4531 | break; |
| 4532 | case Type::Pointer: |
| 4533 | T = cast<PointerType>(Ty)->getPointeeType(); |
| 4534 | break; |
| 4535 | case Type::BlockPointer: |
| 4536 | T = cast<BlockPointerType>(Ty)->getPointeeType(); |
| 4537 | break; |
| 4538 | case Type::LValueReference: |
| 4539 | case Type::RValueReference: |
| 4540 | T = cast<ReferenceType>(Ty)->getPointeeType(); |
| 4541 | break; |
| 4542 | case Type::MemberPointer: |
| 4543 | T = cast<MemberPointerType>(Ty)->getPointeeType(); |
| 4544 | break; |
| 4545 | case Type::ConstantArray: |
| 4546 | case Type::IncompleteArray: |
| 4547 | // Losing element qualification here is fine. |
| 4548 | T = cast<ArrayType>(Ty)->getElementType(); |
| 4549 | break; |
| 4550 | case Type::VariableArray: { |
| 4551 | // Losing element qualification here is fine. |
| 4552 | const VariableArrayType *VAT = cast<VariableArrayType>(Ty); |
| 4553 | |
| 4554 | // Unknown size indication requires no size computation. |
| 4555 | // Otherwise, evaluate and record it. |
| 4556 | auto Size = VAT->getSizeExpr(); |
| 4557 | if (Size && !CSI->isVLATypeCaptured(VAT) && |
| 4558 | (isa<CapturedRegionScopeInfo>(CSI) || isa<LambdaScopeInfo>(CSI))) |
| 4559 | CSI->addVLATypeCapture(Size->getExprLoc(), VAT, Context.getSizeType()); |
| 4560 | |
| 4561 | T = VAT->getElementType(); |
| 4562 | break; |
| 4563 | } |
| 4564 | case Type::FunctionProto: |
| 4565 | case Type::FunctionNoProto: |
| 4566 | T = cast<FunctionType>(Ty)->getReturnType(); |
| 4567 | break; |
| 4568 | case Type::Paren: |
| 4569 | case Type::TypeOf: |
| 4570 | case Type::UnaryTransform: |
| 4571 | case Type::Attributed: |
| 4572 | case Type::BTFTagAttributed: |
| 4573 | case Type::SubstTemplateTypeParm: |
| 4574 | case Type::MacroQualified: |
| 4575 | // Keep walking after single level desugaring. |
| 4576 | T = T.getSingleStepDesugaredType(Context); |
| 4577 | break; |
| 4578 | case Type::Typedef: |
| 4579 | T = cast<TypedefType>(Ty)->desugar(); |
| 4580 | break; |
| 4581 | case Type::Decltype: |
| 4582 | T = cast<DecltypeType>(Ty)->desugar(); |
| 4583 | break; |
| 4584 | case Type::Using: |
| 4585 | T = cast<UsingType>(Ty)->desugar(); |
| 4586 | break; |
| 4587 | case Type::Auto: |
| 4588 | case Type::DeducedTemplateSpecialization: |
| 4589 | T = cast<DeducedType>(Ty)->getDeducedType(); |
| 4590 | break; |
| 4591 | case Type::TypeOfExpr: |
| 4592 | T = cast<TypeOfExprType>(Ty)->getUnderlyingExpr()->getType(); |
| 4593 | break; |
| 4594 | case Type::Atomic: |
| 4595 | T = cast<AtomicType>(Ty)->getValueType(); |
| 4596 | break; |
| 4597 | } |
| 4598 | } while (!T.isNull() && T->isVariablyModifiedType()); |
| 4599 | } |
| 4600 | |
| 4601 | /// Build a sizeof or alignof expression given a type operand. |
| 4602 | ExprResult |
| 4603 | Sema::CreateUnaryExprOrTypeTraitExpr(TypeSourceInfo *TInfo, |
| 4604 | SourceLocation OpLoc, |
| 4605 | UnaryExprOrTypeTrait ExprKind, |
| 4606 | SourceRange R) { |
| 4607 | if (!TInfo) |
| 4608 | return ExprError(); |
| 4609 | |
| 4610 | QualType T = TInfo->getType(); |
| 4611 | |
| 4612 | if (!T->isDependentType() && |
| 4613 | CheckUnaryExprOrTypeTraitOperand(T, OpLoc, R, ExprKind)) |
| 4614 | return ExprError(); |
| 4615 | |
| 4616 | if (T->isVariablyModifiedType() && FunctionScopes.size() > 1) { |
| 4617 | if (auto *TT = T->getAs<TypedefType>()) { |
| 4618 | for (auto I = FunctionScopes.rbegin(), |
| 4619 | E = std::prev(FunctionScopes.rend()); |
| 4620 | I != E; ++I) { |
| 4621 | auto *CSI = dyn_cast<CapturingScopeInfo>(*I); |
| 4622 | if (CSI == nullptr) |
| 4623 | break; |
| 4624 | DeclContext *DC = nullptr; |
| 4625 | if (auto *LSI = dyn_cast<LambdaScopeInfo>(CSI)) |
| 4626 | DC = LSI->CallOperator; |
| 4627 | else if (auto *CRSI = dyn_cast<CapturedRegionScopeInfo>(CSI)) |
| 4628 | DC = CRSI->TheCapturedDecl; |
| 4629 | else if (auto *BSI = dyn_cast<BlockScopeInfo>(CSI)) |
| 4630 | DC = BSI->TheDecl; |
| 4631 | if (DC) { |
| 4632 | if (DC->containsDecl(TT->getDecl())) |
| 4633 | break; |
| 4634 | captureVariablyModifiedType(Context, T, CSI); |
| 4635 | } |
| 4636 | } |
| 4637 | } |
| 4638 | } |
| 4639 | |
| 4640 | // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. |
| 4641 | if (isUnevaluatedContext() && ExprKind == UETT_SizeOf && |
| 4642 | TInfo->getType()->isVariablyModifiedType()) |
| 4643 | TInfo = TransformToPotentiallyEvaluated(TInfo); |
| 4644 | |
| 4645 | return new (Context) UnaryExprOrTypeTraitExpr( |
| 4646 | ExprKind, TInfo, Context.getSizeType(), OpLoc, R.getEnd()); |
| 4647 | } |
| 4648 | |
| 4649 | /// Build a sizeof or alignof expression given an expression |
| 4650 | /// operand. |
| 4651 | ExprResult |
| 4652 | Sema::CreateUnaryExprOrTypeTraitExpr(Expr *E, SourceLocation OpLoc, |
| 4653 | UnaryExprOrTypeTrait ExprKind) { |
| 4654 | ExprResult PE = CheckPlaceholderExpr(E); |
| 4655 | if (PE.isInvalid()) |
| 4656 | return ExprError(); |
| 4657 | |
| 4658 | E = PE.get(); |
| 4659 | |
| 4660 | // Verify that the operand is valid. |
| 4661 | bool isInvalid = false; |
| 4662 | if (E->isTypeDependent()) { |
| 4663 | // Delay type-checking for type-dependent expressions. |
| 4664 | } else if (ExprKind == UETT_AlignOf || ExprKind == UETT_PreferredAlignOf) { |
| 4665 | isInvalid = CheckAlignOfExpr(*this, E, ExprKind); |
| 4666 | } else if (ExprKind == UETT_VecStep) { |
| 4667 | isInvalid = CheckVecStepExpr(E); |
| 4668 | } else if (ExprKind == UETT_OpenMPRequiredSimdAlign) { |
| 4669 | Diag(E->getExprLoc(), diag::err_openmp_default_simd_align_expr); |
| 4670 | isInvalid = true; |
| 4671 | } else if (E->refersToBitField()) { // C99 6.5.3.4p1. |
| 4672 | Diag(E->getExprLoc(), diag::err_sizeof_alignof_typeof_bitfield) << 0; |
| 4673 | isInvalid = true; |
| 4674 | } else { |
| 4675 | isInvalid = CheckUnaryExprOrTypeTraitOperand(E, UETT_SizeOf); |
| 4676 | } |
| 4677 | |
| 4678 | if (isInvalid) |
| 4679 | return ExprError(); |
| 4680 | |
| 4681 | if (ExprKind == UETT_SizeOf && E->getType()->isVariableArrayType()) { |
| 4682 | PE = TransformToPotentiallyEvaluated(E); |
| 4683 | if (PE.isInvalid()) return ExprError(); |
| 4684 | E = PE.get(); |
| 4685 | } |
| 4686 | |
| 4687 | // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. |
| 4688 | return new (Context) UnaryExprOrTypeTraitExpr( |
| 4689 | ExprKind, E, Context.getSizeType(), OpLoc, E->getSourceRange().getEnd()); |
| 4690 | } |
| 4691 | |
| 4692 | /// ActOnUnaryExprOrTypeTraitExpr - Handle @c sizeof(type) and @c sizeof @c |
| 4693 | /// expr and the same for @c alignof and @c __alignof |
| 4694 | /// Note that the ArgRange is invalid if isType is false. |
| 4695 | ExprResult |
| 4696 | Sema::ActOnUnaryExprOrTypeTraitExpr(SourceLocation OpLoc, |
| 4697 | UnaryExprOrTypeTrait ExprKind, bool IsType, |
| 4698 | void *TyOrEx, SourceRange ArgRange) { |
| 4699 | // If error parsing type, ignore. |
| 4700 | if (!TyOrEx) return ExprError(); |
| 4701 | |
| 4702 | if (IsType) { |
| 4703 | TypeSourceInfo *TInfo; |
| 4704 | (void) GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrEx), &TInfo); |
| 4705 | return CreateUnaryExprOrTypeTraitExpr(TInfo, OpLoc, ExprKind, ArgRange); |
| 4706 | } |
| 4707 | |
| 4708 | Expr *ArgEx = (Expr *)TyOrEx; |
| 4709 | ExprResult Result = CreateUnaryExprOrTypeTraitExpr(ArgEx, OpLoc, ExprKind); |
| 4710 | return Result; |
| 4711 | } |
| 4712 | |
| 4713 | static QualType CheckRealImagOperand(Sema &S, ExprResult &V, SourceLocation Loc, |
| 4714 | bool IsReal) { |
| 4715 | if (V.get()->isTypeDependent()) |
| 4716 | return S.Context.DependentTy; |
| 4717 | |
| 4718 | // _Real and _Imag are only l-values for normal l-values. |
| 4719 | if (V.get()->getObjectKind() != OK_Ordinary) { |
| 4720 | V = S.DefaultLvalueConversion(V.get()); |
| 4721 | if (V.isInvalid()) |
| 4722 | return QualType(); |
| 4723 | } |
| 4724 | |
| 4725 | // These operators return the element type of a complex type. |
| 4726 | if (const ComplexType *CT = V.get()->getType()->getAs<ComplexType>()) |
| 4727 | return CT->getElementType(); |
| 4728 | |
| 4729 | // Otherwise they pass through real integer and floating point types here. |
| 4730 | if (V.get()->getType()->isArithmeticType()) |
| 4731 | return V.get()->getType(); |
| 4732 | |
| 4733 | // Test for placeholders. |
| 4734 | ExprResult PR = S.CheckPlaceholderExpr(V.get()); |
| 4735 | if (PR.isInvalid()) return QualType(); |
| 4736 | if (PR.get() != V.get()) { |
| 4737 | V = PR; |
| 4738 | return CheckRealImagOperand(S, V, Loc, IsReal); |
| 4739 | } |
| 4740 | |
| 4741 | // Reject anything else. |
| 4742 | S.Diag(Loc, diag::err_realimag_invalid_type) << V.get()->getType() |
| 4743 | << (IsReal ? "__real" : "__imag"); |
| 4744 | return QualType(); |
| 4745 | } |
| 4746 | |
| 4747 | |
| 4748 | |
| 4749 | ExprResult |
| 4750 | Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, |
| 4751 | tok::TokenKind Kind, Expr *Input) { |
| 4752 | UnaryOperatorKind Opc; |
| 4753 | switch (Kind) { |
| 4754 | default: llvm_unreachable("Unknown unary op!")::llvm::llvm_unreachable_internal("Unknown unary op!", "clang/lib/Sema/SemaExpr.cpp" , 4754); |
| 4755 | case tok::plusplus: Opc = UO_PostInc; break; |
| 4756 | case tok::minusminus: Opc = UO_PostDec; break; |
| 4757 | } |
| 4758 | |
| 4759 | // Since this might is a postfix expression, get rid of ParenListExprs. |
| 4760 | ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Input); |
| 4761 | if (Result.isInvalid()) return ExprError(); |
| 4762 | Input = Result.get(); |
| 4763 | |
| 4764 | return BuildUnaryOp(S, OpLoc, Opc, Input); |
| 4765 | } |
| 4766 | |
| 4767 | /// Diagnose if arithmetic on the given ObjC pointer is illegal. |
| 4768 | /// |
| 4769 | /// \return true on error |
| 4770 | static bool checkArithmeticOnObjCPointer(Sema &S, |
| 4771 | SourceLocation opLoc, |
| 4772 | Expr *op) { |
| 4773 | assert(op->getType()->isObjCObjectPointerType())(static_cast <bool> (op->getType()->isObjCObjectPointerType ()) ? void (0) : __assert_fail ("op->getType()->isObjCObjectPointerType()" , "clang/lib/Sema/SemaExpr.cpp", 4773, __extension__ __PRETTY_FUNCTION__ )); |
| 4774 | if (S.LangOpts.ObjCRuntime.allowsPointerArithmetic() && |
| 4775 | !S.LangOpts.ObjCSubscriptingLegacyRuntime) |
| 4776 | return false; |
| 4777 | |
| 4778 | S.Diag(opLoc, diag::err_arithmetic_nonfragile_interface) |
| 4779 | << op->getType()->castAs<ObjCObjectPointerType>()->getPointeeType() |
| 4780 | << op->getSourceRange(); |
| 4781 | return true; |
| 4782 | } |
| 4783 | |
| 4784 | static bool isMSPropertySubscriptExpr(Sema &S, Expr *Base) { |
| 4785 | auto *BaseNoParens = Base->IgnoreParens(); |
| 4786 | if (auto *MSProp = dyn_cast<MSPropertyRefExpr>(BaseNoParens)) |
| 4787 | return MSProp->getPropertyDecl()->getType()->isArrayType(); |
| 4788 | return isa<MSPropertySubscriptExpr>(BaseNoParens); |
| 4789 | } |
| 4790 | |
| 4791 | // Returns the type used for LHS[RHS], given one of LHS, RHS is type-dependent. |
| 4792 | // Typically this is DependentTy, but can sometimes be more precise. |
| 4793 | // |
| 4794 | // There are cases when we could determine a non-dependent type: |
| 4795 | // - LHS and RHS may have non-dependent types despite being type-dependent |
| 4796 | // (e.g. unbounded array static members of the current instantiation) |
| 4797 | // - one may be a dependent-sized array with known element type |
| 4798 | // - one may be a dependent-typed valid index (enum in current instantiation) |
| 4799 | // |
| 4800 | // We *always* return a dependent type, in such cases it is DependentTy. |
| 4801 | // This avoids creating type-dependent expressions with non-dependent types. |
| 4802 | // FIXME: is this important to avoid? See https://reviews.llvm.org/D107275 |
| 4803 | static QualType getDependentArraySubscriptType(Expr *LHS, Expr *RHS, |
| 4804 | const ASTContext &Ctx) { |
| 4805 | assert(LHS->isTypeDependent() || RHS->isTypeDependent())(static_cast <bool> (LHS->isTypeDependent() || RHS-> isTypeDependent()) ? void (0) : __assert_fail ("LHS->isTypeDependent() || RHS->isTypeDependent()" , "clang/lib/Sema/SemaExpr.cpp", 4805, __extension__ __PRETTY_FUNCTION__ )); |
| 4806 | QualType LTy = LHS->getType(), RTy = RHS->getType(); |
| 4807 | QualType Result = Ctx.DependentTy; |
| 4808 | if (RTy->isIntegralOrUnscopedEnumerationType()) { |
| 4809 | if (const PointerType *PT = LTy->getAs<PointerType>()) |
| 4810 | Result = PT->getPointeeType(); |
| 4811 | else if (const ArrayType *AT = LTy->getAsArrayTypeUnsafe()) |
| 4812 | Result = AT->getElementType(); |
| 4813 | } else if (LTy->isIntegralOrUnscopedEnumerationType()) { |
| 4814 | if (const PointerType *PT = RTy->getAs<PointerType>()) |
| 4815 | Result = PT->getPointeeType(); |
| 4816 | else if (const ArrayType *AT = RTy->getAsArrayTypeUnsafe()) |
| 4817 | Result = AT->getElementType(); |
| 4818 | } |
| 4819 | // Ensure we return a dependent type. |
| 4820 | return Result->isDependentType() ? Result : Ctx.DependentTy; |
| 4821 | } |
| 4822 | |
| 4823 | static bool checkArgsForPlaceholders(Sema &S, MultiExprArg args); |
| 4824 | |
| 4825 | ExprResult Sema::ActOnArraySubscriptExpr(Scope *S, Expr *base, |
| 4826 | SourceLocation lbLoc, |
| 4827 | MultiExprArg ArgExprs, |
| 4828 | SourceLocation rbLoc) { |
| 4829 | |
| 4830 | if (base && !base->getType().isNull() && |
| 4831 | base->hasPlaceholderType(BuiltinType::OMPArraySection)) |
| 4832 | return ActOnOMPArraySectionExpr(base, lbLoc, ArgExprs.front(), SourceLocation(), |
| 4833 | SourceLocation(), /*Length*/ nullptr, |
| 4834 | /*Stride=*/nullptr, rbLoc); |
| 4835 | |
| 4836 | // Since this might be a postfix expression, get rid of ParenListExprs. |
| 4837 | if (isa<ParenListExpr>(base)) { |
| 4838 | ExprResult result = MaybeConvertParenListExprToParenExpr(S, base); |
| 4839 | if (result.isInvalid()) |
| 4840 | return ExprError(); |
| 4841 | base = result.get(); |
| 4842 | } |
| 4843 | |
| 4844 | // Check if base and idx form a MatrixSubscriptExpr. |
| 4845 | // |
| 4846 | // Helper to check for comma expressions, which are not allowed as indices for |
| 4847 | // matrix subscript expressions. |
| 4848 | auto CheckAndReportCommaError = [this, base, rbLoc](Expr *E) { |
| 4849 | if (isa<BinaryOperator>(E) && cast<BinaryOperator>(E)->isCommaOp()) { |
| 4850 | Diag(E->getExprLoc(), diag::err_matrix_subscript_comma) |
| 4851 | << SourceRange(base->getBeginLoc(), rbLoc); |
| 4852 | return true; |
| 4853 | } |
| 4854 | return false; |
| 4855 | }; |
| 4856 | // The matrix subscript operator ([][])is considered a single operator. |
| 4857 | // Separating the index expressions by parenthesis is not allowed. |
| 4858 | if (base->hasPlaceholderType(BuiltinType::IncompleteMatrixIdx) && |
| 4859 | !isa<MatrixSubscriptExpr>(base)) { |
| 4860 | Diag(base->getExprLoc(), diag::err_matrix_separate_incomplete_index) |
| 4861 | << SourceRange(base->getBeginLoc(), rbLoc); |
| 4862 | return ExprError(); |
| 4863 | } |
| 4864 | // If the base is a MatrixSubscriptExpr, try to create a new |
| 4865 | // MatrixSubscriptExpr. |
| 4866 | auto *matSubscriptE = dyn_cast<MatrixSubscriptExpr>(base); |
| 4867 | if (matSubscriptE) { |
| 4868 | assert(ArgExprs.size() == 1)(static_cast <bool> (ArgExprs.size() == 1) ? void (0) : __assert_fail ("ArgExprs.size() == 1", "clang/lib/Sema/SemaExpr.cpp" , 4868, __extension__ __PRETTY_FUNCTION__)); |
| 4869 | if (CheckAndReportCommaError(ArgExprs.front())) |
| 4870 | return ExprError(); |
| 4871 | |
| 4872 | assert(matSubscriptE->isIncomplete() &&(static_cast <bool> (matSubscriptE->isIncomplete() && "base has to be an incomplete matrix subscript") ? void (0) : __assert_fail ("matSubscriptE->isIncomplete() && \"base has to be an incomplete matrix subscript\"" , "clang/lib/Sema/SemaExpr.cpp", 4873, __extension__ __PRETTY_FUNCTION__ )) |
| 4873 | "base has to be an incomplete matrix subscript")(static_cast <bool> (matSubscriptE->isIncomplete() && "base has to be an incomplete matrix subscript") ? void (0) : __assert_fail ("matSubscriptE->isIncomplete() && \"base has to be an incomplete matrix subscript\"" , "clang/lib/Sema/SemaExpr.cpp", 4873, __extension__ __PRETTY_FUNCTION__ )); |
| 4874 | return CreateBuiltinMatrixSubscriptExpr(matSubscriptE->getBase(), |
| 4875 | matSubscriptE->getRowIdx(), |
| 4876 | ArgExprs.front(), rbLoc); |
| 4877 | } |
| 4878 | |
| 4879 | // Handle any non-overload placeholder types in the base and index |
| 4880 | // expressions. We can't handle overloads here because the other |
| 4881 | // operand might be an overloadable type, in which case the overload |
| 4882 | // resolution for the operator overload should get the first crack |
| 4883 | // at the overload. |
| 4884 | bool IsMSPropertySubscript = false; |
| 4885 | if (base->getType()->isNonOverloadPlaceholderType()) { |
| 4886 | IsMSPropertySubscript = isMSPropertySubscriptExpr(*this, base); |
| 4887 | if (!IsMSPropertySubscript) { |
| 4888 | ExprResult result = CheckPlaceholderExpr(base); |
| 4889 | if (result.isInvalid()) |
| 4890 | return ExprError(); |
| 4891 | base = result.get(); |
| 4892 | } |
| 4893 | } |
| 4894 | |
| 4895 | // If the base is a matrix type, try to create a new MatrixSubscriptExpr. |
| 4896 | if (base->getType()->isMatrixType()) { |
| 4897 | assert(ArgExprs.size() == 1)(static_cast <bool> (ArgExprs.size() == 1) ? void (0) : __assert_fail ("ArgExprs.size() == 1", "clang/lib/Sema/SemaExpr.cpp" , 4897, __extension__ __PRETTY_FUNCTION__)); |
| 4898 | if (CheckAndReportCommaError(ArgExprs.front())) |
| 4899 | return ExprError(); |
| 4900 | |
| 4901 | return CreateBuiltinMatrixSubscriptExpr(base, ArgExprs.front(), nullptr, |
| 4902 | rbLoc); |
| 4903 | } |
| 4904 | |
| 4905 | if (ArgExprs.size() == 1 && getLangOpts().CPlusPlus20) { |
| 4906 | Expr *idx = ArgExprs[0]; |
| 4907 | if ((isa<BinaryOperator>(idx) && cast<BinaryOperator>(idx)->isCommaOp()) || |
| 4908 | (isa<CXXOperatorCallExpr>(idx) && |
| 4909 | cast<CXXOperatorCallExpr>(idx)->getOperator() == OO_Comma)) { |
| 4910 | Diag(idx->getExprLoc(), diag::warn_deprecated_comma_subscript) |
| 4911 | << SourceRange(base->getBeginLoc(), rbLoc); |
| 4912 | } |
| 4913 | } |
| 4914 | |
| 4915 | if (ArgExprs.size() == 1 && |
| 4916 | ArgExprs[0]->getType()->isNonOverloadPlaceholderType()) { |
| 4917 | ExprResult result = CheckPlaceholderExpr(ArgExprs[0]); |
| 4918 | if (result.isInvalid()) |
| 4919 | return ExprError(); |
| 4920 | ArgExprs[0] = result.get(); |
| 4921 | } else { |
| 4922 | if (checkArgsForPlaceholders(*this, ArgExprs)) |
| 4923 | return ExprError(); |
| 4924 | } |
| 4925 | |
| 4926 | // Build an unanalyzed expression if either operand is type-dependent. |
| 4927 | if (getLangOpts().CPlusPlus && ArgExprs.size() == 1 && |
| 4928 | (base->isTypeDependent() || |
| 4929 | Expr::hasAnyTypeDependentArguments(ArgExprs))) { |
| 4930 | return new (Context) ArraySubscriptExpr( |
| 4931 | base, ArgExprs.front(), |
| 4932 | getDependentArraySubscriptType(base, ArgExprs.front(), getASTContext()), |
| 4933 | VK_LValue, OK_Ordinary, rbLoc); |
| 4934 | } |
| 4935 | |
| 4936 | // MSDN, property (C++) |
| 4937 | // https://msdn.microsoft.com/en-us/library/yhfk0thd(v=vs.120).aspx |
| 4938 | // This attribute can also be used in the declaration of an empty array in a |
| 4939 | // class or structure definition. For example: |
| 4940 | // __declspec(property(get=GetX, put=PutX)) int x[]; |
| 4941 | // The above statement indicates that x[] can be used with one or more array |
| 4942 | // indices. In this case, i=p->x[a][b] will be turned into i=p->GetX(a, b), |
| 4943 | // and p->x[a][b] = i will be turned into p->PutX(a, b, i); |
| 4944 | if (IsMSPropertySubscript) { |
| 4945 | assert(ArgExprs.size() == 1)(static_cast <bool> (ArgExprs.size() == 1) ? void (0) : __assert_fail ("ArgExprs.size() == 1", "clang/lib/Sema/SemaExpr.cpp" , 4945, __extension__ __PRETTY_FUNCTION__)); |
| 4946 | // Build MS property subscript expression if base is MS property reference |
| 4947 | // or MS property subscript. |
| 4948 | return new (Context) |
| 4949 | MSPropertySubscriptExpr(base, ArgExprs.front(), Context.PseudoObjectTy, |
| 4950 | VK_LValue, OK_Ordinary, rbLoc); |
| 4951 | } |
| 4952 | |
| 4953 | // Use C++ overloaded-operator rules if either operand has record |
| 4954 | // type. The spec says to do this if either type is *overloadable*, |
| 4955 | // but enum types can't declare subscript operators or conversion |
| 4956 | // operators, so there's nothing interesting for overload resolution |
| 4957 | // to do if there aren't any record types involved. |
| 4958 | // |
| 4959 | // ObjC pointers have their own subscripting logic that is not tied |
| 4960 | // to overload resolution and so should not take this path. |
| 4961 | if (getLangOpts().CPlusPlus && !base->getType()->isObjCObjectPointerType() && |
| 4962 | ((base->getType()->isRecordType() || |
| 4963 | (ArgExprs.size() != 1 || ArgExprs[0]->getType()->isRecordType())))) { |
| 4964 | return CreateOverloadedArraySubscriptExpr(lbLoc, rbLoc, base, ArgExprs); |
| 4965 | } |
| 4966 | |
| 4967 | ExprResult Res = |
| 4968 | CreateBuiltinArraySubscriptExpr(base, lbLoc, ArgExprs.front(), rbLoc); |
| 4969 | |
| 4970 | if (!Res.isInvalid() && isa<ArraySubscriptExpr>(Res.get())) |
| 4971 | CheckSubscriptAccessOfNoDeref(cast<ArraySubscriptExpr>(Res.get())); |
| 4972 | |
| 4973 | return Res; |
| 4974 | } |
| 4975 | |
| 4976 | ExprResult Sema::tryConvertExprToType(Expr *E, QualType Ty) { |
| 4977 | InitializedEntity Entity = InitializedEntity::InitializeTemporary(Ty); |
| 4978 | InitializationKind Kind = |
| 4979 | InitializationKind::CreateCopy(E->getBeginLoc(), SourceLocation()); |
| 4980 | InitializationSequence InitSeq(*this, Entity, Kind, E); |
| 4981 | return InitSeq.Perform(*this, Entity, Kind, E); |
| 4982 | } |
| 4983 | |
| 4984 | ExprResult Sema::CreateBuiltinMatrixSubscriptExpr(Expr *Base, Expr *RowIdx, |
| 4985 | Expr *ColumnIdx, |
| 4986 | SourceLocation RBLoc) { |
| 4987 | ExprResult BaseR = CheckPlaceholderExpr(Base); |
| 4988 | if (BaseR.isInvalid()) |
| 4989 | return BaseR; |
| 4990 | Base = BaseR.get(); |
| 4991 | |
| 4992 | ExprResult RowR = CheckPlaceholderExpr(RowIdx); |
| 4993 | if (RowR.isInvalid()) |
| 4994 | return RowR; |
| 4995 | RowIdx = RowR.get(); |
| 4996 | |
| 4997 | if (!ColumnIdx) |
| 4998 | return new (Context) MatrixSubscriptExpr( |
| 4999 | Base, RowIdx, ColumnIdx, Context.IncompleteMatrixIdxTy, RBLoc); |
| 5000 | |
| 5001 | // Build an unanalyzed expression if any of the operands is type-dependent. |
| 5002 | if (Base->isTypeDependent() || RowIdx->isTypeDependent() || |
| 5003 | ColumnIdx->isTypeDependent()) |
| 5004 | return new (Context) MatrixSubscriptExpr(Base, RowIdx, ColumnIdx, |
| 5005 | Context.DependentTy, RBLoc); |
| 5006 | |
| 5007 | ExprResult ColumnR = CheckPlaceholderExpr(ColumnIdx); |
| 5008 | if (ColumnR.isInvalid()) |
| 5009 | return ColumnR; |
| 5010 | ColumnIdx = ColumnR.get(); |
| 5011 | |
| 5012 | // Check that IndexExpr is an integer expression. If it is a constant |
| 5013 | // expression, check that it is less than Dim (= the number of elements in the |
| 5014 | // corresponding dimension). |
| 5015 | auto IsIndexValid = [&](Expr *IndexExpr, unsigned Dim, |
| 5016 | bool IsColumnIdx) -> Expr * { |
| 5017 | if (!IndexExpr->getType()->isIntegerType() && |
| 5018 | !IndexExpr->isTypeDependent()) { |
| 5019 | Diag(IndexExpr->getBeginLoc(), diag::err_matrix_index_not_integer) |
| 5020 | << IsColumnIdx; |
| 5021 | return nullptr; |
| 5022 | } |
| 5023 | |
| 5024 | if (std::optional<llvm::APSInt> Idx = |
| 5025 | IndexExpr->getIntegerConstantExpr(Context)) { |
| 5026 | if ((*Idx < 0 || *Idx >= Dim)) { |
| 5027 | Diag(IndexExpr->getBeginLoc(), diag::err_matrix_index_outside_range) |
| 5028 | << IsColumnIdx << Dim; |
| 5029 | return nullptr; |
| 5030 | } |
| 5031 | } |
| 5032 | |
| 5033 | ExprResult ConvExpr = |
| 5034 | tryConvertExprToType(IndexExpr, Context.getSizeType()); |
| 5035 | assert(!ConvExpr.isInvalid() &&(static_cast <bool> (!ConvExpr.isInvalid() && "should be able to convert any integer type to size type" ) ? void (0) : __assert_fail ("!ConvExpr.isInvalid() && \"should be able to convert any integer type to size type\"" , "clang/lib/Sema/SemaExpr.cpp", 5036, __extension__ __PRETTY_FUNCTION__ )) |
| 5036 | "should be able to convert any integer type to size type")(static_cast <bool> (!ConvExpr.isInvalid() && "should be able to convert any integer type to size type" ) ? void (0) : __assert_fail ("!ConvExpr.isInvalid() && \"should be able to convert any integer type to size type\"" , "clang/lib/Sema/SemaExpr.cpp", 5036, __extension__ __PRETTY_FUNCTION__ )); |
| 5037 | return ConvExpr.get(); |
| 5038 | }; |
| 5039 | |
| 5040 | auto *MTy = Base->getType()->getAs<ConstantMatrixType>(); |
| 5041 | RowIdx = IsIndexValid(RowIdx, MTy->getNumRows(), false); |
| 5042 | ColumnIdx = IsIndexValid(ColumnIdx, MTy->getNumColumns(), true); |
| 5043 | if (!RowIdx || !ColumnIdx) |
| 5044 | return ExprError(); |
| 5045 | |
| 5046 | return new (Context) MatrixSubscriptExpr(Base, RowIdx, ColumnIdx, |
| 5047 | MTy->getElementType(), RBLoc); |
| 5048 | } |
| 5049 | |
| 5050 | void Sema::CheckAddressOfNoDeref(const Expr *E) { |
| 5051 | ExpressionEvaluationContextRecord &LastRecord = ExprEvalContexts.back(); |
| 5052 | const Expr *StrippedExpr = E->IgnoreParenImpCasts(); |
| 5053 | |
| 5054 | // For expressions like `&(*s).b`, the base is recorded and what should be |
| 5055 | // checked. |
| 5056 | const MemberExpr *Member = nullptr; |
| 5057 | while ((Member = dyn_cast<MemberExpr>(StrippedExpr)) && !Member->isArrow()) |
| 5058 | StrippedExpr = Member->getBase()->IgnoreParenImpCasts(); |
| 5059 | |
| 5060 | LastRecord.PossibleDerefs.erase(StrippedExpr); |
| 5061 | } |
| 5062 | |
| 5063 | void Sema::CheckSubscriptAccessOfNoDeref(const ArraySubscriptExpr *E) { |
| 5064 | if (isUnevaluatedContext()) |
| 5065 | return; |
| 5066 | |
| 5067 | QualType ResultTy = E->getType(); |
| 5068 | ExpressionEvaluationContextRecord &LastRecord = ExprEvalContexts.back(); |
| 5069 | |
| 5070 | // Bail if the element is an array since it is not memory access. |
| 5071 | if (isa<ArrayType>(ResultTy)) |
| 5072 | return; |
| 5073 | |
| 5074 | if (ResultTy->hasAttr(attr::NoDeref)) { |
| 5075 | LastRecord.PossibleDerefs.insert(E); |
| 5076 | return; |
| 5077 | } |
| 5078 | |
| 5079 | // Check if the base type is a pointer to a member access of a struct |
| 5080 | // marked with noderef. |
| 5081 | const Expr *Base = E->getBase(); |
| 5082 | QualType BaseTy = Base->getType(); |
| 5083 | if (!(isa<ArrayType>(BaseTy) || isa<PointerType>(BaseTy))) |
| 5084 | // Not a pointer access |
| 5085 | return; |
| 5086 | |
| 5087 | const MemberExpr *Member = nullptr; |
| 5088 | while ((Member = dyn_cast<MemberExpr>(Base->IgnoreParenCasts())) && |
| 5089 | Member->isArrow()) |
| 5090 | Base = Member->getBase(); |
| 5091 | |
| 5092 | if (const auto *Ptr = dyn_cast<PointerType>(Base->getType())) { |
| 5093 | if (Ptr->getPointeeType()->hasAttr(attr::NoDeref)) |
| 5094 | LastRecord.PossibleDerefs.insert(E); |
| 5095 | } |
| 5096 | } |
| 5097 | |
| 5098 | ExprResult Sema::ActOnOMPArraySectionExpr(Expr *Base, SourceLocation LBLoc, |
| 5099 | Expr *LowerBound, |
| 5100 | SourceLocation ColonLocFirst, |
| 5101 | SourceLocation ColonLocSecond, |
| 5102 | Expr *Length, Expr *Stride, |
| 5103 | SourceLocation RBLoc) { |
| 5104 | if (Base->hasPlaceholderType() && |
| 5105 | !Base->hasPlaceholderType(BuiltinType::OMPArraySection)) { |
| 5106 | ExprResult Result = CheckPlaceholderExpr(Base); |
| 5107 | if (Result.isInvalid()) |
| 5108 | return ExprError(); |
| 5109 | Base = Result.get(); |
| 5110 | } |
| 5111 | if (LowerBound && LowerBound->getType()->isNonOverloadPlaceholderType()) { |
| 5112 | ExprResult Result = CheckPlaceholderExpr(LowerBound); |
| 5113 | if (Result.isInvalid()) |
| 5114 | return ExprError(); |
| 5115 | Result = DefaultLvalueConversion(Result.get()); |
| 5116 | if (Result.isInvalid()) |
| 5117 | return ExprError(); |
| 5118 | LowerBound = Result.get(); |
| 5119 | } |
| 5120 | if (Length && Length->getType()->isNonOverloadPlaceholderType()) { |
| 5121 | ExprResult Result = CheckPlaceholderExpr(Length); |
| 5122 | if (Result.isInvalid()) |
| 5123 | return ExprError(); |
| 5124 | Result = DefaultLvalueConversion(Result.get()); |
| 5125 | if (Result.isInvalid()) |
| 5126 | return ExprError(); |
| 5127 | Length = Result.get(); |
| 5128 | } |
| 5129 | if (Stride && Stride->getType()->isNonOverloadPlaceholderType()) { |
| 5130 | ExprResult Result = CheckPlaceholderExpr(Stride); |
| 5131 | if (Result.isInvalid()) |
| 5132 | return ExprError(); |
| 5133 | Result = DefaultLvalueConversion(Result.get()); |
| 5134 | if (Result.isInvalid()) |
| 5135 | return ExprError(); |
| 5136 | Stride = Result.get(); |
| 5137 | } |
| 5138 | |
| 5139 | // Build an unanalyzed expression if either operand is type-dependent. |
| 5140 | if (Base->isTypeDependent() || |
| 5141 | (LowerBound && |
| 5142 | (LowerBound->isTypeDependent() || LowerBound->isValueDependent())) || |
| 5143 | (Length && (Length->isTypeDependent() || Length->isValueDependent())) || |
| 5144 | (Stride && (Stride->isTypeDependent() || Stride->isValueDependent()))) { |
| 5145 | return new (Context) OMPArraySectionExpr( |
| 5146 | Base, LowerBound, Length, Stride, Context.DependentTy, VK_LValue, |
| 5147 | OK_Ordinary, ColonLocFirst, ColonLocSecond, RBLoc); |
| 5148 | } |
| 5149 | |
| 5150 | // Perform default conversions. |
| 5151 | QualType OriginalTy = OMPArraySectionExpr::getBaseOriginalType(Base); |
| 5152 | QualType ResultTy; |
| 5153 | if (OriginalTy->isAnyPointerType()) { |
| 5154 | ResultTy = OriginalTy->getPointeeType(); |
| 5155 | } else if (OriginalTy->isArrayType()) { |
| 5156 | ResultTy = OriginalTy->getAsArrayTypeUnsafe()->getElementType(); |
| 5157 | } else { |
| 5158 | return ExprError( |
| 5159 | Diag(Base->getExprLoc(), diag::err_omp_typecheck_section_value) |
| 5160 | << Base->getSourceRange()); |
| 5161 | } |
| 5162 | // C99 6.5.2.1p1 |
| 5163 | if (LowerBound) { |
| 5164 | auto Res = PerformOpenMPImplicitIntegerConversion(LowerBound->getExprLoc(), |
| 5165 | LowerBound); |
| 5166 | if (Res.isInvalid()) |
| 5167 | return ExprError(Diag(LowerBound->getExprLoc(), |
| 5168 | diag::err_omp_typecheck_section_not_integer) |
| 5169 | << 0 << LowerBound->getSourceRange()); |
| 5170 | LowerBound = Res.get(); |
| 5171 | |
| 5172 | if (LowerBound->getType()->isSpecificBuiltinType(BuiltinType::Char_S) || |
| 5173 | LowerBound->getType()->isSpecificBuiltinType(BuiltinType::Char_U)) |
| 5174 | Diag(LowerBound->getExprLoc(), diag::warn_omp_section_is_char) |
| 5175 | << 0 << LowerBound->getSourceRange(); |
| 5176 | } |
| 5177 | if (Length) { |
| 5178 | auto Res = |
| 5179 | PerformOpenMPImplicitIntegerConversion(Length->getExprLoc(), Length); |
| 5180 | if (Res.isInvalid()) |
| 5181 | return ExprError(Diag(Length->getExprLoc(), |
| 5182 | diag::err_omp_typecheck_section_not_integer) |
| 5183 | << 1 << Length->getSourceRange()); |
| 5184 | Length = Res.get(); |
| 5185 | |
| 5186 | if (Length->getType()->isSpecificBuiltinType(BuiltinType::Char_S) || |
| 5187 | Length->getType()->isSpecificBuiltinType(BuiltinType::Char_U)) |
| 5188 | Diag(Length->getExprLoc(), diag::warn_omp_section_is_char) |
| 5189 | << 1 << Length->getSourceRange(); |
| 5190 | } |
| 5191 | if (Stride) { |
| 5192 | ExprResult Res = |
| 5193 | PerformOpenMPImplicitIntegerConversion(Stride->getExprLoc(), Stride); |
| 5194 | if (Res.isInvalid()) |
| 5195 | return ExprError(Diag(Stride->getExprLoc(), |
| 5196 | diag::err_omp_typecheck_section_not_integer) |
| 5197 | << 1 << Stride->getSourceRange()); |
| 5198 | Stride = Res.get(); |
| 5199 | |
| 5200 | if (Stride->getType()->isSpecificBuiltinType(BuiltinType::Char_S) || |
| 5201 | Stride->getType()->isSpecificBuiltinType(BuiltinType::Char_U)) |
| 5202 | Diag(Stride->getExprLoc(), diag::warn_omp_section_is_char) |
| 5203 | << 1 << Stride->getSourceRange(); |
| 5204 | } |
| 5205 | |
| 5206 | // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, |
| 5207 | // C++ [expr.sub]p1: The type "T" shall be a completely-defined object |
| 5208 | // type. Note that functions are not objects, and that (in C99 parlance) |
| 5209 | // incomplete types are not object types. |
| 5210 | if (ResultTy->isFunctionType()) { |
| 5211 | Diag(Base->getExprLoc(), diag::err_omp_section_function_type) |
| 5212 | << ResultTy << Base->getSourceRange(); |
| 5213 | return ExprError(); |
| 5214 | } |
| 5215 | |
| 5216 | if (RequireCompleteType(Base->getExprLoc(), ResultTy, |
| 5217 | diag::err_omp_section_incomplete_type, Base)) |
| 5218 | return ExprError(); |
| 5219 | |
| 5220 | if (LowerBound && !OriginalTy->isAnyPointerType()) { |
| 5221 | Expr::EvalResult Result; |
| 5222 | if (LowerBound->EvaluateAsInt(Result, Context)) { |
| 5223 | // OpenMP 5.0, [2.1.5 Array Sections] |
| 5224 | // The array section must be a subset of the original array. |
| 5225 | llvm::APSInt LowerBoundValue = Result.Val.getInt(); |
| 5226 | if (LowerBoundValue.isNegative()) { |
| 5227 | Diag(LowerBound->getExprLoc(), diag::err_omp_section_not_subset_of_array) |
| 5228 | << LowerBound->getSourceRange(); |
| 5229 | return ExprError(); |
| 5230 | } |
| 5231 | } |
| 5232 | } |
| 5233 | |
| 5234 | if (Length) { |
| 5235 | Expr::EvalResult Result; |
| 5236 | if (Length->EvaluateAsInt(Result, Context)) { |
| 5237 | // OpenMP 5.0, [2.1.5 Array Sections] |
| 5238 | // The length must evaluate to non-negative integers. |
| 5239 | llvm::APSInt LengthValue = Result.Val.getInt(); |
| 5240 | if (LengthValue.isNegative()) { |
| 5241 | Diag(Length->getExprLoc(), diag::err_omp_section_length_negative) |
| 5242 | << toString(LengthValue, /*Radix=*/10, /*Signed=*/true) |
| 5243 | << Length->getSourceRange(); |
| 5244 | return ExprError(); |
| 5245 | } |
| 5246 | } |
| 5247 | } else if (ColonLocFirst.isValid() && |
| 5248 | (OriginalTy.isNull() || (!OriginalTy->isConstantArrayType() && |
| 5249 | !OriginalTy->isVariableArrayType()))) { |
| 5250 | // OpenMP 5.0, [2.1.5 Array Sections] |
| 5251 | // When the size of the array dimension is not known, the length must be |
| 5252 | // specified explicitly. |
| 5253 | Diag(ColonLocFirst, diag::err_omp_section_length_undefined) |
| 5254 | << (!OriginalTy.isNull() && OriginalTy->isArrayType()); |
| 5255 | return ExprError(); |
| 5256 | } |
| 5257 | |
| 5258 | if (Stride) { |
| 5259 | Expr::EvalResult Result; |
| 5260 | if (Stride->EvaluateAsInt(Result, Context)) { |
| 5261 | // OpenMP 5.0, [2.1.5 Array Sections] |
| 5262 | // The stride must evaluate to a positive integer. |
| 5263 | llvm::APSInt StrideValue = Result.Val.getInt(); |
| 5264 | if (!StrideValue.isStrictlyPositive()) { |
| 5265 | Diag(Stride->getExprLoc(), diag::err_omp_section_stride_non_positive) |
| 5266 | << toString(StrideValue, /*Radix=*/10, /*Signed=*/true) |
| 5267 | << Stride->getSourceRange(); |
| 5268 | return ExprError(); |
| 5269 | } |
| 5270 | } |
| 5271 | } |
| 5272 | |
| 5273 | if (!Base->hasPlaceholderType(BuiltinType::OMPArraySection)) { |
| 5274 | ExprResult Result = DefaultFunctionArrayLvalueConversion(Base); |
| 5275 | if (Result.isInvalid()) |
| 5276 | return ExprError(); |
| 5277 | Base = Result.get(); |
| 5278 | } |
| 5279 | return new (Context) OMPArraySectionExpr( |
| 5280 | Base, LowerBound, Length, Stride, Context.OMPArraySectionTy, VK_LValue, |
| 5281 | OK_Ordinary, ColonLocFirst, ColonLocSecond, RBLoc); |
| 5282 | } |
| 5283 | |
| 5284 | ExprResult Sema::ActOnOMPArrayShapingExpr(Expr *Base, SourceLocation LParenLoc, |
| 5285 | SourceLocation RParenLoc, |
| 5286 | ArrayRef<Expr *> Dims, |
| 5287 | ArrayRef<SourceRange> Brackets) { |
| 5288 | if (Base->hasPlaceholderType()) { |
| 5289 | ExprResult Result = CheckPlaceholderExpr(Base); |
| 5290 | if (Result.isInvalid()) |
| 5291 | return ExprError(); |
| 5292 | Result = DefaultLvalueConversion(Result.get()); |
| 5293 | if (Result.isInvalid()) |
| 5294 | return ExprError(); |
| 5295 | Base = Result.get(); |
| 5296 | } |
| 5297 | QualType BaseTy = Base->getType(); |
| 5298 | // Delay analysis of the types/expressions if instantiation/specialization is |
| 5299 | // required. |
| 5300 | if (!BaseTy->isPointerType() && Base->isTypeDependent()) |
| 5301 | return OMPArrayShapingExpr::Create(Context, Context.DependentTy, Base, |
| 5302 | LParenLoc, RParenLoc, Dims, Brackets); |
| 5303 | if (!BaseTy->isPointerType() || |
| 5304 | (!Base->isTypeDependent() && |
| 5305 | BaseTy->getPointeeType()->isIncompleteType())) |
| 5306 | return ExprError(Diag(Base->getExprLoc(), |
| 5307 | diag::err_omp_non_pointer_type_array_shaping_base) |
| 5308 | << Base->getSourceRange()); |
| 5309 | |
| 5310 | SmallVector<Expr *, 4> NewDims; |
| 5311 | bool ErrorFound = false; |
| 5312 | for (Expr *Dim : Dims) { |
| 5313 | if (Dim->hasPlaceholderType()) { |
| 5314 | ExprResult Result = CheckPlaceholderExpr(Dim); |
| 5315 | if (Result.isInvalid()) { |
| 5316 | ErrorFound = true; |
| 5317 | continue; |
| 5318 | } |
| 5319 | Result = DefaultLvalueConversion(Result.get()); |
| 5320 | if (Result.isInvalid()) { |
| 5321 | ErrorFound = true; |
| 5322 | continue; |
| 5323 | } |
| 5324 | Dim = Result.get(); |
| 5325 | } |
| 5326 | if (!Dim->isTypeDependent()) { |
| 5327 | ExprResult Result = |
| 5328 | PerformOpenMPImplicitIntegerConversion(Dim->getExprLoc(), Dim); |
| 5329 | if (Result.isInvalid()) { |
| 5330 | ErrorFound = true; |
| 5331 | Diag(Dim->getExprLoc(), diag::err_omp_typecheck_shaping_not_integer) |
| 5332 | << Dim->getSourceRange(); |
| 5333 | continue; |
| 5334 | } |
| 5335 | Dim = Result.get(); |
| 5336 | Expr::EvalResult EvResult; |
| 5337 | if (!Dim->isValueDependent() && Dim->EvaluateAsInt(EvResult, Context)) { |
| 5338 | // OpenMP 5.0, [2.1.4 Array Shaping] |
| 5339 | // Each si is an integral type expression that must evaluate to a |
| 5340 | // positive integer. |
| 5341 | llvm::APSInt Value = EvResult.Val.getInt(); |
| 5342 | if (!Value.isStrictlyPositive()) { |
| 5343 | Diag(Dim->getExprLoc(), diag::err_omp_shaping_dimension_not_positive) |
| 5344 | << toString(Value, /*Radix=*/10, /*Signed=*/true) |
| 5345 | << Dim->getSourceRange(); |
| 5346 | ErrorFound = true; |
| 5347 | continue; |
| 5348 | } |
| 5349 | } |
| 5350 | } |
| 5351 | NewDims.push_back(Dim); |
| 5352 | } |
| 5353 | if (ErrorFound) |
| 5354 | return ExprError(); |
| 5355 | return OMPArrayShapingExpr::Create(Context, Context.OMPArrayShapingTy, Base, |
| 5356 | LParenLoc, RParenLoc, NewDims, Brackets); |
| 5357 | } |
| 5358 | |
| 5359 | ExprResult Sema::ActOnOMPIteratorExpr(Scope *S, SourceLocation IteratorKwLoc, |
| 5360 | SourceLocation LLoc, SourceLocation RLoc, |
| 5361 | ArrayRef<OMPIteratorData> Data) { |
| 5362 | SmallVector<OMPIteratorExpr::IteratorDefinition, 4> ID; |
| 5363 | bool IsCorrect = true; |
| 5364 | for (const OMPIteratorData &D : Data) { |
| 5365 | TypeSourceInfo *TInfo = nullptr; |
| 5366 | SourceLocation StartLoc; |
| 5367 | QualType DeclTy; |
| 5368 | if (!D.Type.getAsOpaquePtr()) { |
| 5369 | // OpenMP 5.0, 2.1.6 Iterators |
| 5370 | // In an iterator-specifier, if the iterator-type is not specified then |
| 5371 | // the type of that iterator is of int type. |
| 5372 | DeclTy = Context.IntTy; |
| 5373 | StartLoc = D.DeclIdentLoc; |
| 5374 | } else { |
| 5375 | DeclTy = GetTypeFromParser(D.Type, &TInfo); |
| 5376 | StartLoc = TInfo->getTypeLoc().getBeginLoc(); |
| 5377 | } |
| 5378 | |
| 5379 | bool IsDeclTyDependent = DeclTy->isDependentType() || |
| 5380 | DeclTy->containsUnexpandedParameterPack() || |
| 5381 | DeclTy->isInstantiationDependentType(); |
| 5382 | if (!IsDeclTyDependent) { |
| 5383 | if (!DeclTy->isIntegralType(Context) && !DeclTy->isAnyPointerType()) { |
| 5384 | // OpenMP 5.0, 2.1.6 Iterators, Restrictions, C/C++ |
| 5385 | // The iterator-type must be an integral or pointer type. |
| 5386 | Diag(StartLoc, diag::err_omp_iterator_not_integral_or_pointer) |
| 5387 | << DeclTy; |
| 5388 | IsCorrect = false; |
| 5389 | continue; |
| 5390 | } |
| 5391 | if (DeclTy.isConstant(Context)) { |
| 5392 | // OpenMP 5.0, 2.1.6 Iterators, Restrictions, C/C++ |
| 5393 | // The iterator-type must not be const qualified. |
| 5394 | Diag(StartLoc, diag::err_omp_iterator_not_integral_or_pointer) |
| 5395 | << DeclTy; |
| 5396 | IsCorrect = false; |
| 5397 | continue; |
| 5398 | } |
| 5399 | } |
| 5400 | |
| 5401 | // Iterator declaration. |
| 5402 | assert(D.DeclIdent && "Identifier expected.")(static_cast <bool> (D.DeclIdent && "Identifier expected." ) ? void (0) : __assert_fail ("D.DeclIdent && \"Identifier expected.\"" , "clang/lib/Sema/SemaExpr.cpp", 5402, __extension__ __PRETTY_FUNCTION__ )); |
| 5403 | // Always try to create iterator declarator to avoid extra error messages |
| 5404 | // about unknown declarations use. |
| 5405 | auto *VD = VarDecl::Create(Context, CurContext, StartLoc, D.DeclIdentLoc, |
| 5406 | D.DeclIdent, DeclTy, TInfo, SC_None); |
| 5407 | VD->setImplicit(); |
| 5408 | if (S) { |
| 5409 | // Check for conflicting previous declaration. |
| 5410 | DeclarationNameInfo NameInfo(VD->getDeclName(), D.DeclIdentLoc); |
| 5411 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, |
| 5412 | ForVisibleRedeclaration); |
| 5413 | Previous.suppressDiagnostics(); |
| 5414 | LookupName(Previous, S); |
| 5415 | |
| 5416 | FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage=*/false, |
| 5417 | /*AllowInlineNamespace=*/false); |
| 5418 | if (!Previous.empty()) { |
| 5419 | NamedDecl *Old = Previous.getRepresentativeDecl(); |
| 5420 | Diag(D.DeclIdentLoc, diag::err_redefinition) << VD->getDeclName(); |
| 5421 | Diag(Old->getLocation(), diag::note_previous_definition); |
| 5422 | } else { |
| 5423 | PushOnScopeChains(VD, S); |
| 5424 | } |
| 5425 | } else { |
| 5426 | CurContext->addDecl(VD); |
| 5427 | } |
| 5428 | |
| 5429 | /// Act on the iterator variable declaration. |
| 5430 | ActOnOpenMPIteratorVarDecl(VD); |
| 5431 | |
| 5432 | Expr *Begin = D.Range.Begin; |
| 5433 | if (!IsDeclTyDependent && Begin && !Begin->isTypeDependent()) { |
| 5434 | ExprResult BeginRes = |
| 5435 | PerformImplicitConversion(Begin, DeclTy, AA_Converting); |
| 5436 | Begin = BeginRes.get(); |
| 5437 | } |
| 5438 | Expr *End = D.Range.End; |
| 5439 | if (!IsDeclTyDependent && End && !End->isTypeDependent()) { |
| 5440 | ExprResult EndRes = PerformImplicitConversion(End, DeclTy, AA_Converting); |
| 5441 | End = EndRes.get(); |
| 5442 | } |
| 5443 | Expr *Step = D.Range.Step; |
| 5444 | if (!IsDeclTyDependent && Step && !Step->isTypeDependent()) { |
| 5445 | if (!Step->getType()->isIntegralType(Context)) { |
| 5446 | Diag(Step->getExprLoc(), diag::err_omp_iterator_step_not_integral) |
| 5447 | << Step << Step->getSourceRange(); |
| 5448 | IsCorrect = false; |
| 5449 | continue; |
| 5450 | } |
| 5451 | std::optional<llvm::APSInt> Result = |
| 5452 | Step->getIntegerConstantExpr(Context); |
| 5453 | // OpenMP 5.0, 2.1.6 Iterators, Restrictions |
| 5454 | // If the step expression of a range-specification equals zero, the |
| 5455 | // behavior is unspecified. |
| 5456 | if (Result && Result->isZero()) { |
| 5457 | Diag(Step->getExprLoc(), diag::err_omp_iterator_step_constant_zero) |
| 5458 | << Step << Step->getSourceRange(); |
| 5459 | IsCorrect = false; |
| 5460 | continue; |
| 5461 | } |
| 5462 | } |
| 5463 | if (!Begin || !End || !IsCorrect) { |
| 5464 | IsCorrect = false; |
| 5465 | continue; |
| 5466 | } |
| 5467 | OMPIteratorExpr::IteratorDefinition &IDElem = ID.emplace_back(); |
| 5468 | IDElem.IteratorDecl = VD; |
| 5469 | IDElem.AssignmentLoc = D.AssignLoc; |
| 5470 | IDElem.Range.Begin = Begin; |
| 5471 | IDElem.Range.End = End; |
| 5472 | IDElem.Range.Step = Step; |
| 5473 | IDElem.ColonLoc = D.ColonLoc; |
| 5474 | IDElem.SecondColonLoc = D.SecColonLoc; |
| 5475 | } |
| 5476 | if (!IsCorrect) { |
| 5477 | // Invalidate all created iterator declarations if error is found. |
| 5478 | for (const OMPIteratorExpr::IteratorDefinition &D : ID) { |
| 5479 | if (Decl *ID = D.IteratorDecl) |
| 5480 | ID->setInvalidDecl(); |
| 5481 | } |
| 5482 | return ExprError(); |
| 5483 | } |
| 5484 | SmallVector<OMPIteratorHelperData, 4> Helpers; |
| 5485 | if (!CurContext->isDependentContext()) { |
| 5486 | // Build number of ityeration for each iteration range. |
| 5487 | // Ni = ((Stepi > 0) ? ((Endi + Stepi -1 - Begini)/Stepi) : |
| 5488 | // ((Begini-Stepi-1-Endi) / -Stepi); |
| 5489 | for (OMPIteratorExpr::IteratorDefinition &D : ID) { |
| 5490 | // (Endi - Begini) |
| 5491 | ExprResult Res = CreateBuiltinBinOp(D.AssignmentLoc, BO_Sub, D.Range.End, |
| 5492 | D.Range.Begin); |
| 5493 | if(!Res.isUsable()) { |
| 5494 | IsCorrect = false; |
| 5495 | continue; |
| 5496 | } |
| 5497 | ExprResult St, St1; |
| 5498 | if (D.Range.Step) { |
| 5499 | St = D.Range.Step; |
| 5500 | // (Endi - Begini) + Stepi |
| 5501 | Res = CreateBuiltinBinOp(D.AssignmentLoc, BO_Add, Res.get(), St.get()); |
| 5502 | if (!Res.isUsable()) { |
| 5503 | IsCorrect = false; |
| 5504 | continue; |
| 5505 | } |
| 5506 | // (Endi - Begini) + Stepi - 1 |
| 5507 | Res = |
| 5508 | CreateBuiltinBinOp(D.AssignmentLoc, BO_Sub, Res.get(), |
| 5509 | ActOnIntegerConstant(D.AssignmentLoc, 1).get()); |
| 5510 | if (!Res.isUsable()) { |
| 5511 | IsCorrect = false; |
| 5512 | continue; |
| 5513 | } |
| 5514 | // ((Endi - Begini) + Stepi - 1) / Stepi |
| 5515 | Res = CreateBuiltinBinOp(D.AssignmentLoc, BO_Div, Res.get(), St.get()); |
| 5516 | if (!Res.isUsable()) { |
| 5517 | IsCorrect = false; |
| 5518 | continue; |
| 5519 | } |
| 5520 | St1 = CreateBuiltinUnaryOp(D.AssignmentLoc, UO_Minus, D.Range.Step); |
| 5521 | // (Begini - Endi) |
| 5522 | ExprResult Res1 = CreateBuiltinBinOp(D.AssignmentLoc, BO_Sub, |
| 5523 | D.Range.Begin, D.Range.End); |
| 5524 | if (!Res1.isUsable()) { |
| 5525 | IsCorrect = false; |
| 5526 | continue; |
| 5527 | } |
| 5528 | // (Begini - Endi) - Stepi |
| 5529 | Res1 = |
| 5530 | CreateBuiltinBinOp(D.AssignmentLoc, BO_Add, Res1.get(), St1.get()); |
| 5531 | if (!Res1.isUsable()) { |
| 5532 | IsCorrect = false; |
| 5533 | continue; |
| 5534 | } |
| 5535 | // (Begini - Endi) - Stepi - 1 |
| 5536 | Res1 = |
| 5537 | CreateBuiltinBinOp(D.AssignmentLoc, BO_Sub, Res1.get(), |
| 5538 | ActOnIntegerConstant(D.AssignmentLoc, 1).get()); |
| 5539 | if (!Res1.isUsable()) { |
| 5540 | IsCorrect = false; |
| 5541 | continue; |
| 5542 | } |
| 5543 | // ((Begini - Endi) - Stepi - 1) / (-Stepi) |
| 5544 | Res1 = |
| 5545 | CreateBuiltinBinOp(D.AssignmentLoc, BO_Div, Res1.get(), St1.get()); |
| 5546 | if (!Res1.isUsable()) { |
| 5547 | IsCorrect = false; |
| 5548 | continue; |
| 5549 | } |
| 5550 | // Stepi > 0. |
| 5551 | ExprResult CmpRes = |
| 5552 | CreateBuiltinBinOp(D.AssignmentLoc, BO_GT, D.Range.Step, |
| 5553 | ActOnIntegerConstant(D.AssignmentLoc, 0).get()); |
| 5554 | if (!CmpRes.isUsable()) { |
| 5555 | IsCorrect = false; |
| 5556 | continue; |
| 5557 | } |
| 5558 | Res = ActOnConditionalOp(D.AssignmentLoc, D.AssignmentLoc, CmpRes.get(), |
| 5559 | Res.get(), Res1.get()); |
| 5560 | if (!Res.isUsable()) { |
| 5561 | IsCorrect = false; |
| 5562 | continue; |
| 5563 | } |
| 5564 | } |
| 5565 | Res = ActOnFinishFullExpr(Res.get(), /*DiscardedValue=*/false); |
| 5566 | if (!Res.isUsable()) { |
| 5567 | IsCorrect = false; |
| 5568 | continue; |
| 5569 | } |
| 5570 | |
| 5571 | // Build counter update. |
| 5572 | // Build counter. |
| 5573 | auto *CounterVD = |
| 5574 | VarDecl::Create(Context, CurContext, D.IteratorDecl->getBeginLoc(), |
| 5575 | D.IteratorDecl->getBeginLoc(), nullptr, |
| 5576 | Res.get()->getType(), nullptr, SC_None); |
| 5577 | CounterVD->setImplicit(); |
| 5578 | ExprResult RefRes = |
| 5579 | BuildDeclRefExpr(CounterVD, CounterVD->getType(), VK_LValue, |
| 5580 | D.IteratorDecl->getBeginLoc()); |
| 5581 | // Build counter update. |
| 5582 | // I = Begini + counter * Stepi; |
| 5583 | ExprResult UpdateRes; |
| 5584 | if (D.Range.Step) { |
| 5585 | UpdateRes = CreateBuiltinBinOp( |
| 5586 | D.AssignmentLoc, BO_Mul, |
| 5587 | DefaultLvalueConversion(RefRes.get()).get(), St.get()); |
| 5588 | } else { |
| 5589 | UpdateRes = DefaultLvalueConversion(RefRes.get()); |
| 5590 | } |
| 5591 | if (!UpdateRes.isUsable()) { |
| 5592 | IsCorrect = false; |
| 5593 | continue; |
| 5594 | } |
| 5595 | UpdateRes = CreateBuiltinBinOp(D.AssignmentLoc, BO_Add, D.Range.Begin, |
| 5596 | UpdateRes.get()); |
| 5597 | if (!UpdateRes.isUsable()) { |
| 5598 | IsCorrect = false; |
| 5599 | continue; |
| 5600 | } |
| 5601 | ExprResult VDRes = |
| 5602 | BuildDeclRefExpr(cast<VarDecl>(D.IteratorDecl), |
| 5603 | cast<VarDecl>(D.IteratorDecl)->getType(), VK_LValue, |
| 5604 | D.IteratorDecl->getBeginLoc()); |
| 5605 | UpdateRes = CreateBuiltinBinOp(D.AssignmentLoc, BO_Assign, VDRes.get(), |
| 5606 | UpdateRes.get()); |
| 5607 | if (!UpdateRes.isUsable()) { |
| 5608 | IsCorrect = false; |
| 5609 | continue; |
| 5610 | } |
| 5611 | UpdateRes = |
| 5612 | ActOnFinishFullExpr(UpdateRes.get(), /*DiscardedValue=*/true); |
| 5613 | if (!UpdateRes.isUsable()) { |
| 5614 | IsCorrect = false; |
| 5615 | continue; |
| 5616 | } |
| 5617 | ExprResult CounterUpdateRes = |
| 5618 | CreateBuiltinUnaryOp(D.AssignmentLoc, UO_PreInc, RefRes.get()); |
| 5619 | if (!CounterUpdateRes.isUsable()) { |
| 5620 | IsCorrect = false; |
| 5621 | continue; |
| 5622 | } |
| 5623 | CounterUpdateRes = |
| 5624 | ActOnFinishFullExpr(CounterUpdateRes.get(), /*DiscardedValue=*/true); |
| 5625 | if (!CounterUpdateRes.isUsable()) { |
| 5626 | IsCorrect = false; |
| 5627 | continue; |
| 5628 | } |
| 5629 | OMPIteratorHelperData &HD = Helpers.emplace_back(); |
| 5630 | HD.CounterVD = CounterVD; |
| 5631 | HD.Upper = Res.get(); |
| 5632 | HD.Update = UpdateRes.get(); |
| 5633 | HD.CounterUpdate = CounterUpdateRes.get(); |
| 5634 | } |
| 5635 | } else { |
| 5636 | Helpers.assign(ID.size(), {}); |
| 5637 | } |
| 5638 | if (!IsCorrect) { |
| 5639 | // Invalidate all created iterator declarations if error is found. |
| 5640 | for (const OMPIteratorExpr::IteratorDefinition &D : ID) { |
| 5641 | if (Decl *ID = D.IteratorDecl) |
| 5642 | ID->setInvalidDecl(); |
| 5643 | } |
| 5644 | return ExprError(); |
| 5645 | } |
| 5646 | return OMPIteratorExpr::Create(Context, Context.OMPIteratorTy, IteratorKwLoc, |
| 5647 | LLoc, RLoc, ID, Helpers); |
| 5648 | } |
| 5649 | |
| 5650 | ExprResult |
| 5651 | Sema::CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc, |
| 5652 | Expr *Idx, SourceLocation RLoc) { |
| 5653 | Expr *LHSExp = Base; |
| 5654 | Expr *RHSExp = Idx; |
| 5655 | |
| 5656 | ExprValueKind VK = VK_LValue; |
| 5657 | ExprObjectKind OK = OK_Ordinary; |
| 5658 | |
| 5659 | // Per C++ core issue 1213, the result is an xvalue if either operand is |
| 5660 | // a non-lvalue array, and an lvalue otherwise. |
| 5661 | if (getLangOpts().CPlusPlus11) { |
| 5662 | for (auto *Op : {LHSExp, RHSExp}) { |
| 5663 | Op = Op->IgnoreImplicit(); |
| 5664 | if (Op->getType()->isArrayType() && !Op->isLValue()) |
| 5665 | VK = VK_XValue; |
| 5666 | } |
| 5667 | } |
| 5668 | |
| 5669 | // Perform default conversions. |
| 5670 | if (!LHSExp->getType()->getAs<VectorType>()) { |
| 5671 | ExprResult Result = DefaultFunctionArrayLvalueConversion(LHSExp); |
| 5672 | if (Result.isInvalid()) |
| 5673 | return ExprError(); |
| 5674 | LHSExp = Result.get(); |
| 5675 | } |
| 5676 | ExprResult Result = DefaultFunctionArrayLvalueConversion(RHSExp); |
| 5677 | if (Result.isInvalid()) |
| 5678 | return ExprError(); |
| 5679 | RHSExp = Result.get(); |
| 5680 | |
| 5681 | QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); |
| 5682 | |
| 5683 | // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent |
| 5684 | // to the expression *((e1)+(e2)). This means the array "Base" may actually be |
| 5685 | // in the subscript position. As a result, we need to derive the array base |
| 5686 | // and index from the expression types. |
| 5687 | Expr *BaseExpr, *IndexExpr; |
| 5688 | QualType ResultType; |
| 5689 | if (LHSTy->isDependentType() || RHSTy->isDependentType()) { |
| 5690 | BaseExpr = LHSExp; |
| 5691 | IndexExpr = RHSExp; |
| 5692 | ResultType = |
| 5693 | getDependentArraySubscriptType(LHSExp, RHSExp, getASTContext()); |
| 5694 | } else if (const PointerType *PTy = LHSTy->getAs<PointerType>()) { |
| 5695 | BaseExpr = LHSExp; |
| 5696 | IndexExpr = RHSExp; |
| 5697 | ResultType = PTy->getPointeeType(); |
| 5698 | } else if (const ObjCObjectPointerType *PTy = |
| 5699 | LHSTy->getAs<ObjCObjectPointerType>()) { |
| 5700 | BaseExpr = LHSExp; |
| 5701 | IndexExpr = RHSExp; |
| 5702 | |
| 5703 | // Use custom logic if this should be the pseudo-object subscript |
| 5704 | // expression. |
| 5705 | if (!LangOpts.isSubscriptPointerArithmetic()) |
| 5706 | return BuildObjCSubscriptExpression(RLoc, BaseExpr, IndexExpr, nullptr, |
| 5707 | nullptr); |
| 5708 | |
| 5709 | ResultType = PTy->getPointeeType(); |
| 5710 | } else if (const PointerType *PTy = RHSTy->getAs<PointerType>()) { |
| 5711 | // Handle the uncommon case of "123[Ptr]". |
| 5712 | BaseExpr = RHSExp; |
| 5713 | IndexExpr = LHSExp; |
| 5714 | ResultType = PTy->getPointeeType(); |
| 5715 | } else if (const ObjCObjectPointerType *PTy = |
| 5716 | RHSTy->getAs<ObjCObjectPointerType>()) { |
| 5717 | // Handle the uncommon case of "123[Ptr]". |
| 5718 | BaseExpr = RHSExp; |
| 5719 | IndexExpr = LHSExp; |
| 5720 | ResultType = PTy->getPointeeType(); |
| 5721 | if (!LangOpts.isSubscriptPointerArithmetic()) { |
| 5722 | Diag(LLoc, diag::err_subscript_nonfragile_interface) |
| 5723 | << ResultType << BaseExpr->getSourceRange(); |
| 5724 | return ExprError(); |
| 5725 | } |
| 5726 | } else if (const VectorType *VTy = LHSTy->getAs<VectorType>()) { |
| 5727 | BaseExpr = LHSExp; // vectors: V[123] |
| 5728 | IndexExpr = RHSExp; |
| 5729 | // We apply C++ DR1213 to vector subscripting too. |
| 5730 | if (getLangOpts().CPlusPlus11 && LHSExp->isPRValue()) { |
| 5731 | ExprResult Materialized = TemporaryMaterializationConversion(LHSExp); |
| 5732 | if (Materialized.isInvalid()) |
| 5733 | return ExprError(); |
| 5734 | LHSExp = Materialized.get(); |
| 5735 | } |
| 5736 | VK = LHSExp->getValueKind(); |
| 5737 | if (VK != VK_PRValue) |
| 5738 | OK = OK_VectorComponent; |
| 5739 | |
| 5740 | ResultType = VTy->getElementType(); |
| 5741 | QualType BaseType = BaseExpr->getType(); |
| 5742 | Qualifiers BaseQuals = BaseType.getQualifiers(); |
| 5743 | Qualifiers MemberQuals = ResultType.getQualifiers(); |
| 5744 | Qualifiers Combined = BaseQuals + MemberQuals; |
| 5745 | if (Combined != MemberQuals) |
| 5746 | ResultType = Context.getQualifiedType(ResultType, Combined); |
| 5747 | } else if (LHSTy->isBuiltinType() && |
| 5748 | LHSTy->getAs<BuiltinType>()->isVLSTBuiltinType()) { |
| 5749 | const BuiltinType *BTy = LHSTy->getAs<BuiltinType>(); |
| 5750 | if (BTy->isSVEBool()) |
| 5751 | return ExprError(Diag(LLoc, diag::err_subscript_svbool_t) |
| 5752 | << LHSExp->getSourceRange() << RHSExp->getSourceRange()); |
| 5753 | |
| 5754 | BaseExpr = LHSExp; |
| 5755 | IndexExpr = RHSExp; |
| 5756 | if (getLangOpts().CPlusPlus11 && LHSExp->isPRValue()) { |
| 5757 | ExprResult Materialized = TemporaryMaterializationConversion(LHSExp); |
| 5758 | if (Materialized.isInvalid()) |
| 5759 | return ExprError(); |
| 5760 | LHSExp = Materialized.get(); |
| 5761 | } |
| 5762 | VK = LHSExp->getValueKind(); |
| 5763 | if (VK != VK_PRValue) |
| 5764 | OK = OK_VectorComponent; |
| 5765 | |
| 5766 | ResultType = BTy->getSveEltType(Context); |
| 5767 | |
| 5768 | QualType BaseType = BaseExpr->getType(); |
| 5769 | Qualifiers BaseQuals = BaseType.getQualifiers(); |
| 5770 | Qualifiers MemberQuals = ResultType.getQualifiers(); |
| 5771 | Qualifiers Combined = BaseQuals + MemberQuals; |
| 5772 | if (Combined != MemberQuals) |
| 5773 | ResultType = Context.getQualifiedType(ResultType, Combined); |
| 5774 | } else if (LHSTy->isArrayType()) { |
| 5775 | // If we see an array that wasn't promoted by |
| 5776 | // DefaultFunctionArrayLvalueConversion, it must be an array that |
| 5777 | // wasn't promoted because of the C90 rule that doesn't |
| 5778 | // allow promoting non-lvalue arrays. Warn, then |
| 5779 | // force the promotion here. |
| 5780 | Diag(LHSExp->getBeginLoc(), diag::ext_subscript_non_lvalue) |
| 5781 | << LHSExp->getSourceRange(); |
| 5782 | LHSExp = ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy), |
| 5783 | CK_ArrayToPointerDecay).get(); |
| 5784 | LHSTy = LHSExp->getType(); |
| 5785 | |
| 5786 | BaseExpr = LHSExp; |
| 5787 | IndexExpr = RHSExp; |
| 5788 | ResultType = LHSTy->castAs<PointerType>()->getPointeeType(); |
| 5789 | } else if (RHSTy->isArrayType()) { |
| 5790 | // Same as previous, except for 123[f().a] case |
| 5791 | Diag(RHSExp->getBeginLoc(), diag::ext_subscript_non_lvalue) |
| 5792 | << RHSExp->getSourceRange(); |
| 5793 | RHSExp = ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy), |
| 5794 | CK_ArrayToPointerDecay).get(); |
| 5795 | RHSTy = RHSExp->getType(); |
| 5796 | |
| 5797 | BaseExpr = RHSExp; |
| 5798 | IndexExpr = LHSExp; |
| 5799 | ResultType = RHSTy->castAs<PointerType>()->getPointeeType(); |
| 5800 | } else { |
| 5801 | return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value) |
| 5802 | << LHSExp->getSourceRange() << RHSExp->getSourceRange()); |
| 5803 | } |
| 5804 | // C99 6.5.2.1p1 |
| 5805 | if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) |
| 5806 | return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer) |
| 5807 | << IndexExpr->getSourceRange()); |
| 5808 | |
| 5809 | if ((IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_S) || |
| 5810 | IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_U)) |
| 5811 | && !IndexExpr->isTypeDependent()) |
| 5812 | Diag(LLoc, diag::warn_subscript_is_char) << IndexExpr->getSourceRange(); |
| 5813 | |
| 5814 | // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, |
| 5815 | // C++ [expr.sub]p1: The type "T" shall be a completely-defined object |
| 5816 | // type. Note that Functions are not objects, and that (in C99 parlance) |
| 5817 | // incomplete types are not object types. |
| 5818 | if (ResultType->isFunctionType()) { |
| 5819 | Diag(BaseExpr->getBeginLoc(), diag::err_subscript_function_type) |
| 5820 | << ResultType << BaseExpr->getSourceRange(); |
| 5821 | return ExprError(); |
| 5822 | } |
| 5823 | |
| 5824 | if (ResultType->isVoidType() && !getLangOpts().CPlusPlus) { |
| 5825 | // GNU extension: subscripting on pointer to void |
| 5826 | Diag(LLoc, diag::ext_gnu_subscript_void_type) |
| 5827 | << BaseExpr->getSourceRange(); |
| 5828 | |
| 5829 | // C forbids expressions of unqualified void type from being l-values. |
| 5830 | // See IsCForbiddenLValueType. |
| 5831 | if (!ResultType.hasQualifiers()) |
| 5832 | VK = VK_PRValue; |
| 5833 | } else if (!ResultType->isDependentType() && |
| 5834 | RequireCompleteSizedType( |
| 5835 | LLoc, ResultType, |
| 5836 | diag::err_subscript_incomplete_or_sizeless_type, BaseExpr)) |
| 5837 | return ExprError(); |
| 5838 | |
| 5839 | assert(VK == VK_PRValue || LangOpts.CPlusPlus ||(static_cast <bool> (VK == VK_PRValue || LangOpts.CPlusPlus || !ResultType.isCForbiddenLValueType()) ? void (0) : __assert_fail ("VK == VK_PRValue || LangOpts.CPlusPlus || !ResultType.isCForbiddenLValueType()" , "clang/lib/Sema/SemaExpr.cpp", 5840, __extension__ __PRETTY_FUNCTION__ )) |
| 5840 | !ResultType.isCForbiddenLValueType())(static_cast <bool> (VK == VK_PRValue || LangOpts.CPlusPlus || !ResultType.isCForbiddenLValueType()) ? void (0) : __assert_fail ("VK == VK_PRValue || LangOpts.CPlusPlus || !ResultType.isCForbiddenLValueType()" , "clang/lib/Sema/SemaExpr.cpp", 5840, __extension__ __PRETTY_FUNCTION__ )); |
| 5841 | |
| 5842 | if (LHSExp->IgnoreParenImpCasts()->getType()->isVariablyModifiedType() && |
| 5843 | FunctionScopes.size() > 1) { |
| 5844 | if (auto *TT = |
| 5845 | LHSExp->IgnoreParenImpCasts()->getType()->getAs<TypedefType>()) { |
| 5846 | for (auto I = FunctionScopes.rbegin(), |
| 5847 | E = std::prev(FunctionScopes.rend()); |
| 5848 | I != E; ++I) { |
| 5849 | auto *CSI = dyn_cast<CapturingScopeInfo>(*I); |
| 5850 | if (CSI == nullptr) |
| 5851 | break; |
| 5852 | DeclContext *DC = nullptr; |
| 5853 | if (auto *LSI = dyn_cast<LambdaScopeInfo>(CSI)) |
| 5854 | DC = LSI->CallOperator; |
| 5855 | else if (auto *CRSI = dyn_cast<CapturedRegionScopeInfo>(CSI)) |
| 5856 | DC = CRSI->TheCapturedDecl; |
| 5857 | else if (auto *BSI = dyn_cast<BlockScopeInfo>(CSI)) |
| 5858 | DC = BSI->TheDecl; |
| 5859 | if (DC) { |
| 5860 | if (DC->containsDecl(TT->getDecl())) |
| 5861 | break; |
| 5862 | captureVariablyModifiedType( |
| 5863 | Context, LHSExp->IgnoreParenImpCasts()->getType(), CSI); |
| 5864 | } |
| 5865 | } |
| 5866 | } |
| 5867 | } |
| 5868 | |
| 5869 | return new (Context) |
| 5870 | ArraySubscriptExpr(LHSExp, RHSExp, ResultType, VK, OK, RLoc); |
| 5871 | } |
| 5872 | |
| 5873 | bool Sema::CheckCXXDefaultArgExpr(SourceLocation CallLoc, FunctionDecl *FD, |
| 5874 | ParmVarDecl *Param, Expr *RewrittenInit, |
| 5875 | bool SkipImmediateInvocations) { |
| 5876 | if (Param->hasUnparsedDefaultArg()) { |
| 5877 | assert(!RewrittenInit && "Should not have a rewritten init expression yet")(static_cast <bool> (!RewrittenInit && "Should not have a rewritten init expression yet" ) ? void (0) : __assert_fail ("!RewrittenInit && \"Should not have a rewritten init expression yet\"" , "clang/lib/Sema/SemaExpr.cpp", 5877, __extension__ __PRETTY_FUNCTION__ )); |
| 5878 | // If we've already cleared out the location for the default argument, |
| 5879 | // that means we're parsing it right now. |
| 5880 | if (!UnparsedDefaultArgLocs.count(Param)) { |
| 5881 | Diag(Param->getBeginLoc(), diag::err_recursive_default_argument) << FD; |
| 5882 | Diag(CallLoc, diag::note_recursive_default_argument_used_here); |
| 5883 | Param->setInvalidDecl(); |
| 5884 | return true; |
| 5885 | } |
| 5886 | |
| 5887 | Diag(CallLoc, diag::err_use_of_default_argument_to_function_declared_later) |
| 5888 | << FD << cast<CXXRecordDecl>(FD->getDeclContext()); |
| 5889 | Diag(UnparsedDefaultArgLocs[Param], |
| 5890 | diag::note_default_argument_declared_here); |
| 5891 | return true; |
| 5892 | } |
| 5893 | |
| 5894 | if (Param->hasUninstantiatedDefaultArg()) { |
| 5895 | assert(!RewrittenInit && "Should not have a rewitten init expression yet")(static_cast <bool> (!RewrittenInit && "Should not have a rewitten init expression yet" ) ? void (0) : __assert_fail ("!RewrittenInit && \"Should not have a rewitten init expression yet\"" , "clang/lib/Sema/SemaExpr.cpp", 5895, __extension__ __PRETTY_FUNCTION__ )); |
| 5896 | if (InstantiateDefaultArgument(CallLoc, FD, Param)) |
| 5897 | return true; |
| 5898 | } |
| 5899 | |
| 5900 | Expr *Init = RewrittenInit ? RewrittenInit : Param->getInit(); |
| 5901 | assert(Init && "default argument but no initializer?")(static_cast <bool> (Init && "default argument but no initializer?" ) ? void (0) : __assert_fail ("Init && \"default argument but no initializer?\"" , "clang/lib/Sema/SemaExpr.cpp", 5901, __extension__ __PRETTY_FUNCTION__ )); |
| 5902 | |
| 5903 | // If the default expression creates temporaries, we need to |
| 5904 | // push them to the current stack of expression temporaries so they'll |
| 5905 | // be properly destroyed. |
| 5906 | // FIXME: We should really be rebuilding the default argument with new |
| 5907 | // bound temporaries; see the comment in PR5810. |
| 5908 | // We don't need to do that with block decls, though, because |
| 5909 | // blocks in default argument expression can never capture anything. |
| 5910 | if (auto *InitWithCleanup = dyn_cast<ExprWithCleanups>(Init)) { |
| 5911 | // Set the "needs cleanups" bit regardless of whether there are |
| 5912 | // any explicit objects. |
| 5913 | Cleanup.setExprNeedsCleanups(InitWithCleanup->cleanupsHaveSideEffects()); |
| 5914 | // Append all the objects to the cleanup list. Right now, this |
| 5915 | // should always be a no-op, because blocks in default argument |
| 5916 | // expressions should never be able to capture anything. |
| 5917 | assert(!InitWithCleanup->getNumObjects() &&(static_cast <bool> (!InitWithCleanup->getNumObjects () && "default argument expression has capturing blocks?" ) ? void (0) : __assert_fail ("!InitWithCleanup->getNumObjects() && \"default argument expression has capturing blocks?\"" , "clang/lib/Sema/SemaExpr.cpp", 5918, __extension__ __PRETTY_FUNCTION__ )) |
| 5918 | "default argument expression has capturing blocks?")(static_cast <bool> (!InitWithCleanup->getNumObjects () && "default argument expression has capturing blocks?" ) ? void (0) : __assert_fail ("!InitWithCleanup->getNumObjects() && \"default argument expression has capturing blocks?\"" , "clang/lib/Sema/SemaExpr.cpp", 5918, __extension__ __PRETTY_FUNCTION__ )); |
| 5919 | } |
| 5920 | EnterExpressionEvaluationContext EvalContext( |
| 5921 | *this, ExpressionEvaluationContext::PotentiallyEvaluated, Param); |
| 5922 | ExprEvalContexts.back().IsCurrentlyCheckingDefaultArgumentOrInitializer = |
| 5923 | SkipImmediateInvocations; |
| 5924 | MarkDeclarationsReferencedInExpr(Init, /*SkipLocalVariables*/ true); |
| 5925 | return false; |
| 5926 | } |
| 5927 | |
| 5928 | struct ImmediateCallVisitor : public RecursiveASTVisitor<ImmediateCallVisitor> { |
| 5929 | bool HasImmediateCalls = |