Bug Summary

File:clang/lib/CodeGen/CGDebugInfo.cpp
Warning:line 1549, column 19
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name CGDebugInfo.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -relaxed-aliasing -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -fno-split-dwarf-inlining -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-12/lib/clang/12.0.0 -D CLANG_VENDOR="Debian " -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/build-llvm/tools/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include -I /build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/build-llvm/include -I /build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/llvm/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-12/lib/clang/12.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/build-llvm/tools/clang/lib/CodeGen -fdebug-prefix-map=/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e=. -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2020-10-27-053609-25509-1 -x c++ /build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp

/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp

1//===--- CGDebugInfo.cpp - Emit Debug Information for a Module ------------===//
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 coordinates the debug information generation while generating code.
10//
11//===----------------------------------------------------------------------===//
12
13#include "CGDebugInfo.h"
14#include "CGBlocks.h"
15#include "CGCXXABI.h"
16#include "CGObjCRuntime.h"
17#include "CGRecordLayout.h"
18#include "CodeGenFunction.h"
19#include "CodeGenModule.h"
20#include "ConstantEmitter.h"
21#include "clang/AST/ASTContext.h"
22#include "clang/AST/Attr.h"
23#include "clang/AST/DeclFriend.h"
24#include "clang/AST/DeclObjC.h"
25#include "clang/AST/DeclTemplate.h"
26#include "clang/AST/Expr.h"
27#include "clang/AST/RecordLayout.h"
28#include "clang/Basic/CodeGenOptions.h"
29#include "clang/Basic/FileManager.h"
30#include "clang/Basic/SourceManager.h"
31#include "clang/Basic/Version.h"
32#include "clang/Frontend/FrontendOptions.h"
33#include "clang/Lex/HeaderSearchOptions.h"
34#include "clang/Lex/ModuleMap.h"
35#include "clang/Lex/PreprocessorOptions.h"
36#include "llvm/ADT/DenseSet.h"
37#include "llvm/ADT/SmallVector.h"
38#include "llvm/ADT/StringExtras.h"
39#include "llvm/IR/Constants.h"
40#include "llvm/IR/DataLayout.h"
41#include "llvm/IR/DerivedTypes.h"
42#include "llvm/IR/Instructions.h"
43#include "llvm/IR/Intrinsics.h"
44#include "llvm/IR/Metadata.h"
45#include "llvm/IR/Module.h"
46#include "llvm/Support/FileSystem.h"
47#include "llvm/Support/MD5.h"
48#include "llvm/Support/Path.h"
49#include "llvm/Support/TimeProfiler.h"
50using namespace clang;
51using namespace clang::CodeGen;
52
53static uint32_t getTypeAlignIfRequired(const Type *Ty, const ASTContext &Ctx) {
54 auto TI = Ctx.getTypeInfo(Ty);
55 return TI.AlignIsRequired ? TI.Align : 0;
56}
57
58static uint32_t getTypeAlignIfRequired(QualType Ty, const ASTContext &Ctx) {
59 return getTypeAlignIfRequired(Ty.getTypePtr(), Ctx);
60}
61
62static uint32_t getDeclAlignIfRequired(const Decl *D, const ASTContext &Ctx) {
63 return D->hasAttr<AlignedAttr>() ? D->getMaxAlignment() : 0;
64}
65
66CGDebugInfo::CGDebugInfo(CodeGenModule &CGM)
67 : CGM(CGM), DebugKind(CGM.getCodeGenOpts().getDebugInfo()),
68 DebugTypeExtRefs(CGM.getCodeGenOpts().DebugTypeExtRefs),
69 DBuilder(CGM.getModule()) {
70 for (const auto &KV : CGM.getCodeGenOpts().DebugPrefixMap)
71 DebugPrefixMap[KV.first] = KV.second;
72 CreateCompileUnit();
73}
74
75CGDebugInfo::~CGDebugInfo() {
76 assert(LexicalBlockStack.empty() &&((LexicalBlockStack.empty() && "Region stack mismatch, stack not empty!"
) ? static_cast<void> (0) : __assert_fail ("LexicalBlockStack.empty() && \"Region stack mismatch, stack not empty!\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 77, __PRETTY_FUNCTION__))
77 "Region stack mismatch, stack not empty!")((LexicalBlockStack.empty() && "Region stack mismatch, stack not empty!"
) ? static_cast<void> (0) : __assert_fail ("LexicalBlockStack.empty() && \"Region stack mismatch, stack not empty!\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 77, __PRETTY_FUNCTION__))
;
78}
79
80ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF,
81 SourceLocation TemporaryLocation)
82 : CGF(&CGF) {
83 init(TemporaryLocation);
84}
85
86ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF,
87 bool DefaultToEmpty,
88 SourceLocation TemporaryLocation)
89 : CGF(&CGF) {
90 init(TemporaryLocation, DefaultToEmpty);
91}
92
93void ApplyDebugLocation::init(SourceLocation TemporaryLocation,
94 bool DefaultToEmpty) {
95 auto *DI = CGF->getDebugInfo();
96 if (!DI) {
97 CGF = nullptr;
98 return;
99 }
100
101 OriginalLocation = CGF->Builder.getCurrentDebugLocation();
102
103 if (OriginalLocation && !DI->CGM.getExpressionLocationsEnabled())
104 return;
105
106 if (TemporaryLocation.isValid()) {
107 DI->EmitLocation(CGF->Builder, TemporaryLocation);
108 return;
109 }
110
111 if (DefaultToEmpty) {
112 CGF->Builder.SetCurrentDebugLocation(llvm::DebugLoc());
113 return;
114 }
115
116 // Construct a location that has a valid scope, but no line info.
117 assert(!DI->LexicalBlockStack.empty())((!DI->LexicalBlockStack.empty()) ? static_cast<void>
(0) : __assert_fail ("!DI->LexicalBlockStack.empty()", "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 117, __PRETTY_FUNCTION__))
;
118 CGF->Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(
119 0, 0, DI->LexicalBlockStack.back(), DI->getInlinedAt()));
120}
121
122ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF, const Expr *E)
123 : CGF(&CGF) {
124 init(E->getExprLoc());
125}
126
127ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF, llvm::DebugLoc Loc)
128 : CGF(&CGF) {
129 if (!CGF.getDebugInfo()) {
130 this->CGF = nullptr;
131 return;
132 }
133 OriginalLocation = CGF.Builder.getCurrentDebugLocation();
134 if (Loc)
135 CGF.Builder.SetCurrentDebugLocation(std::move(Loc));
136}
137
138ApplyDebugLocation::~ApplyDebugLocation() {
139 // Query CGF so the location isn't overwritten when location updates are
140 // temporarily disabled (for C++ default function arguments)
141 if (CGF)
142 CGF->Builder.SetCurrentDebugLocation(std::move(OriginalLocation));
143}
144
145ApplyInlineDebugLocation::ApplyInlineDebugLocation(CodeGenFunction &CGF,
146 GlobalDecl InlinedFn)
147 : CGF(&CGF) {
148 if (!CGF.getDebugInfo()) {
149 this->CGF = nullptr;
150 return;
151 }
152 auto &DI = *CGF.getDebugInfo();
153 SavedLocation = DI.getLocation();
154 assert((DI.getInlinedAt() ==(((DI.getInlinedAt() == CGF.Builder.getCurrentDebugLocation()
->getInlinedAt()) && "CGDebugInfo and IRBuilder are out of sync"
) ? static_cast<void> (0) : __assert_fail ("(DI.getInlinedAt() == CGF.Builder.getCurrentDebugLocation()->getInlinedAt()) && \"CGDebugInfo and IRBuilder are out of sync\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 156, __PRETTY_FUNCTION__))
155 CGF.Builder.getCurrentDebugLocation()->getInlinedAt()) &&(((DI.getInlinedAt() == CGF.Builder.getCurrentDebugLocation()
->getInlinedAt()) && "CGDebugInfo and IRBuilder are out of sync"
) ? static_cast<void> (0) : __assert_fail ("(DI.getInlinedAt() == CGF.Builder.getCurrentDebugLocation()->getInlinedAt()) && \"CGDebugInfo and IRBuilder are out of sync\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 156, __PRETTY_FUNCTION__))
156 "CGDebugInfo and IRBuilder are out of sync")(((DI.getInlinedAt() == CGF.Builder.getCurrentDebugLocation()
->getInlinedAt()) && "CGDebugInfo and IRBuilder are out of sync"
) ? static_cast<void> (0) : __assert_fail ("(DI.getInlinedAt() == CGF.Builder.getCurrentDebugLocation()->getInlinedAt()) && \"CGDebugInfo and IRBuilder are out of sync\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 156, __PRETTY_FUNCTION__))
;
157
158 DI.EmitInlineFunctionStart(CGF.Builder, InlinedFn);
159}
160
161ApplyInlineDebugLocation::~ApplyInlineDebugLocation() {
162 if (!CGF)
163 return;
164 auto &DI = *CGF->getDebugInfo();
165 DI.EmitInlineFunctionEnd(CGF->Builder);
166 DI.EmitLocation(CGF->Builder, SavedLocation);
167}
168
169void CGDebugInfo::setLocation(SourceLocation Loc) {
170 // If the new location isn't valid return.
171 if (Loc.isInvalid())
172 return;
173
174 CurLoc = CGM.getContext().getSourceManager().getExpansionLoc(Loc);
175
176 // If we've changed files in the middle of a lexical scope go ahead
177 // and create a new lexical scope with file node if it's different
178 // from the one in the scope.
179 if (LexicalBlockStack.empty())
180 return;
181
182 SourceManager &SM = CGM.getContext().getSourceManager();
183 auto *Scope = cast<llvm::DIScope>(LexicalBlockStack.back());
184 PresumedLoc PCLoc = SM.getPresumedLoc(CurLoc);
185 if (PCLoc.isInvalid() || Scope->getFile() == getOrCreateFile(CurLoc))
186 return;
187
188 if (auto *LBF = dyn_cast<llvm::DILexicalBlockFile>(Scope)) {
189 LexicalBlockStack.pop_back();
190 LexicalBlockStack.emplace_back(DBuilder.createLexicalBlockFile(
191 LBF->getScope(), getOrCreateFile(CurLoc)));
192 } else if (isa<llvm::DILexicalBlock>(Scope) ||
193 isa<llvm::DISubprogram>(Scope)) {
194 LexicalBlockStack.pop_back();
195 LexicalBlockStack.emplace_back(
196 DBuilder.createLexicalBlockFile(Scope, getOrCreateFile(CurLoc)));
197 }
198}
199
200llvm::DIScope *CGDebugInfo::getDeclContextDescriptor(const Decl *D) {
201 llvm::DIScope *Mod = getParentModuleOrNull(D);
202 return getContextDescriptor(cast<Decl>(D->getDeclContext()),
203 Mod ? Mod : TheCU);
204}
205
206llvm::DIScope *CGDebugInfo::getContextDescriptor(const Decl *Context,
207 llvm::DIScope *Default) {
208 if (!Context)
209 return Default;
210
211 auto I = RegionMap.find(Context);
212 if (I != RegionMap.end()) {
213 llvm::Metadata *V = I->second;
214 return dyn_cast_or_null<llvm::DIScope>(V);
215 }
216
217 // Check namespace.
218 if (const auto *NSDecl = dyn_cast<NamespaceDecl>(Context))
219 return getOrCreateNamespace(NSDecl);
220
221 if (const auto *RDecl = dyn_cast<RecordDecl>(Context))
222 if (!RDecl->isDependentType())
223 return getOrCreateType(CGM.getContext().getTypeDeclType(RDecl),
224 TheCU->getFile());
225 return Default;
226}
227
228PrintingPolicy CGDebugInfo::getPrintingPolicy() const {
229 PrintingPolicy PP = CGM.getContext().getPrintingPolicy();
230
231 // If we're emitting codeview, it's important to try to match MSVC's naming so
232 // that visualizers written for MSVC will trigger for our class names. In
233 // particular, we can't have spaces between arguments of standard templates
234 // like basic_string and vector, but we must have spaces between consecutive
235 // angle brackets that close nested template argument lists.
236 if (CGM.getCodeGenOpts().EmitCodeView) {
237 PP.MSVCFormatting = true;
238 PP.SplitTemplateClosers = true;
239 } else {
240 // For DWARF, printing rules are underspecified.
241 // SplitTemplateClosers yields better interop with GCC and GDB (PR46052).
242 PP.SplitTemplateClosers = true;
243 }
244
245 // Apply -fdebug-prefix-map.
246 PP.Callbacks = &PrintCB;
247 return PP;
248}
249
250StringRef CGDebugInfo::getFunctionName(const FunctionDecl *FD) {
251 assert(FD && "Invalid FunctionDecl!")((FD && "Invalid FunctionDecl!") ? static_cast<void
> (0) : __assert_fail ("FD && \"Invalid FunctionDecl!\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 251, __PRETTY_FUNCTION__))
;
252 IdentifierInfo *FII = FD->getIdentifier();
253 FunctionTemplateSpecializationInfo *Info =
254 FD->getTemplateSpecializationInfo();
255
256 // Emit the unqualified name in normal operation. LLVM and the debugger can
257 // compute the fully qualified name from the scope chain. If we're only
258 // emitting line table info, there won't be any scope chains, so emit the
259 // fully qualified name here so that stack traces are more accurate.
260 // FIXME: Do this when emitting DWARF as well as when emitting CodeView after
261 // evaluating the size impact.
262 bool UseQualifiedName = DebugKind == codegenoptions::DebugLineTablesOnly &&
263 CGM.getCodeGenOpts().EmitCodeView;
264
265 if (!Info && FII && !UseQualifiedName)
266 return FII->getName();
267
268 SmallString<128> NS;
269 llvm::raw_svector_ostream OS(NS);
270 if (!UseQualifiedName)
271 FD->printName(OS);
272 else
273 FD->printQualifiedName(OS, getPrintingPolicy());
274
275 // Add any template specialization args.
276 if (Info) {
277 const TemplateArgumentList *TArgs = Info->TemplateArguments;
278 printTemplateArgumentList(OS, TArgs->asArray(), getPrintingPolicy());
279 }
280
281 // Copy this name on the side and use its reference.
282 return internString(OS.str());
283}
284
285StringRef CGDebugInfo::getObjCMethodName(const ObjCMethodDecl *OMD) {
286 SmallString<256> MethodName;
287 llvm::raw_svector_ostream OS(MethodName);
288 OS << (OMD->isInstanceMethod() ? '-' : '+') << '[';
289 const DeclContext *DC = OMD->getDeclContext();
290 if (const auto *OID = dyn_cast<ObjCImplementationDecl>(DC)) {
291 OS << OID->getName();
292 } else if (const auto *OID = dyn_cast<ObjCInterfaceDecl>(DC)) {
293 OS << OID->getName();
294 } else if (const auto *OC = dyn_cast<ObjCCategoryDecl>(DC)) {
295 if (OC->IsClassExtension()) {
296 OS << OC->getClassInterface()->getName();
297 } else {
298 OS << OC->getIdentifier()->getNameStart() << '('
299 << OC->getIdentifier()->getNameStart() << ')';
300 }
301 } else if (const auto *OCD = dyn_cast<ObjCCategoryImplDecl>(DC)) {
302 OS << OCD->getClassInterface()->getName() << '(' << OCD->getName() << ')';
303 }
304 OS << ' ' << OMD->getSelector().getAsString() << ']';
305
306 return internString(OS.str());
307}
308
309StringRef CGDebugInfo::getSelectorName(Selector S) {
310 return internString(S.getAsString());
311}
312
313StringRef CGDebugInfo::getClassName(const RecordDecl *RD) {
314 if (isa<ClassTemplateSpecializationDecl>(RD)) {
315 SmallString<128> Name;
316 llvm::raw_svector_ostream OS(Name);
317 PrintingPolicy PP = getPrintingPolicy();
318 PP.PrintCanonicalTypes = true;
319 RD->getNameForDiagnostic(OS, PP,
320 /*Qualified*/ false);
321
322 // Copy this name on the side and use its reference.
323 return internString(Name);
324 }
325
326 // quick optimization to avoid having to intern strings that are already
327 // stored reliably elsewhere
328 if (const IdentifierInfo *II = RD->getIdentifier())
329 return II->getName();
330
331 // The CodeView printer in LLVM wants to see the names of unnamed types: it is
332 // used to reconstruct the fully qualified type names.
333 if (CGM.getCodeGenOpts().EmitCodeView) {
334 if (const TypedefNameDecl *D = RD->getTypedefNameForAnonDecl()) {
335 assert(RD->getDeclContext() == D->getDeclContext() &&((RD->getDeclContext() == D->getDeclContext() &&
"Typedef should not be in another decl context!") ? static_cast
<void> (0) : __assert_fail ("RD->getDeclContext() == D->getDeclContext() && \"Typedef should not be in another decl context!\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 336, __PRETTY_FUNCTION__))
336 "Typedef should not be in another decl context!")((RD->getDeclContext() == D->getDeclContext() &&
"Typedef should not be in another decl context!") ? static_cast
<void> (0) : __assert_fail ("RD->getDeclContext() == D->getDeclContext() && \"Typedef should not be in another decl context!\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 336, __PRETTY_FUNCTION__))
;
337 assert(D->getDeclName().getAsIdentifierInfo() &&((D->getDeclName().getAsIdentifierInfo() && "Typedef was not named!"
) ? static_cast<void> (0) : __assert_fail ("D->getDeclName().getAsIdentifierInfo() && \"Typedef was not named!\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 338, __PRETTY_FUNCTION__))
338 "Typedef was not named!")((D->getDeclName().getAsIdentifierInfo() && "Typedef was not named!"
) ? static_cast<void> (0) : __assert_fail ("D->getDeclName().getAsIdentifierInfo() && \"Typedef was not named!\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 338, __PRETTY_FUNCTION__))
;
339 return D->getDeclName().getAsIdentifierInfo()->getName();
340 }
341
342 if (CGM.getLangOpts().CPlusPlus) {
343 StringRef Name;
344
345 ASTContext &Context = CGM.getContext();
346 if (const DeclaratorDecl *DD = Context.getDeclaratorForUnnamedTagDecl(RD))
347 // Anonymous types without a name for linkage purposes have their
348 // declarator mangled in if they have one.
349 Name = DD->getName();
350 else if (const TypedefNameDecl *TND =
351 Context.getTypedefNameForUnnamedTagDecl(RD))
352 // Anonymous types without a name for linkage purposes have their
353 // associate typedef mangled in if they have one.
354 Name = TND->getName();
355
356 if (!Name.empty()) {
357 SmallString<256> UnnamedType("<unnamed-type-");
358 UnnamedType += Name;
359 UnnamedType += '>';
360 return internString(UnnamedType);
361 }
362 }
363 }
364
365 return StringRef();
366}
367
368Optional<llvm::DIFile::ChecksumKind>
369CGDebugInfo::computeChecksum(FileID FID, SmallString<32> &Checksum) const {
370 Checksum.clear();
371
372 if (!CGM.getCodeGenOpts().EmitCodeView &&
373 CGM.getCodeGenOpts().DwarfVersion < 5)
374 return None;
375
376 SourceManager &SM = CGM.getContext().getSourceManager();
377 Optional<llvm::MemoryBufferRef> MemBuffer = SM.getBufferOrNone(FID);
378 if (!MemBuffer)
379 return None;
380
381 llvm::MD5 Hash;
382 llvm::MD5::MD5Result Result;
383
384 Hash.update(MemBuffer->getBuffer());
385 Hash.final(Result);
386
387 Hash.stringifyResult(Result, Checksum);
388 return llvm::DIFile::CSK_MD5;
389}
390
391Optional<StringRef> CGDebugInfo::getSource(const SourceManager &SM,
392 FileID FID) {
393 if (!CGM.getCodeGenOpts().EmbedSource)
394 return None;
395
396 bool SourceInvalid = false;
397 StringRef Source = SM.getBufferData(FID, &SourceInvalid);
398
399 if (SourceInvalid)
400 return None;
401
402 return Source;
403}
404
405llvm::DIFile *CGDebugInfo::getOrCreateFile(SourceLocation Loc) {
406 if (!Loc.isValid())
407 // If Location is not valid then use main input file.
408 return TheCU->getFile();
409
410 SourceManager &SM = CGM.getContext().getSourceManager();
411 PresumedLoc PLoc = SM.getPresumedLoc(Loc);
412
413 StringRef FileName = PLoc.getFilename();
414 if (PLoc.isInvalid() || FileName.empty())
415 // If the location is not valid then use main input file.
416 return TheCU->getFile();
417
418 // Cache the results.
419 auto It = DIFileCache.find(FileName.data());
420 if (It != DIFileCache.end()) {
421 // Verify that the information still exists.
422 if (llvm::Metadata *V = It->second)
423 return cast<llvm::DIFile>(V);
424 }
425
426 SmallString<32> Checksum;
427
428 // Compute the checksum if possible. If the location is affected by a #line
429 // directive that refers to a file, PLoc will have an invalid FileID, and we
430 // will correctly get no checksum.
431 Optional<llvm::DIFile::ChecksumKind> CSKind =
432 computeChecksum(PLoc.getFileID(), Checksum);
433 Optional<llvm::DIFile::ChecksumInfo<StringRef>> CSInfo;
434 if (CSKind)
435 CSInfo.emplace(*CSKind, Checksum);
436 return createFile(FileName, CSInfo, getSource(SM, SM.getFileID(Loc)));
437}
438
439llvm::DIFile *
440CGDebugInfo::createFile(StringRef FileName,
441 Optional<llvm::DIFile::ChecksumInfo<StringRef>> CSInfo,
442 Optional<StringRef> Source) {
443 StringRef Dir;
444 StringRef File;
445 std::string RemappedFile = remapDIPath(FileName);
446 std::string CurDir = remapDIPath(getCurrentDirname());
447 SmallString<128> DirBuf;
448 SmallString<128> FileBuf;
449 if (llvm::sys::path::is_absolute(RemappedFile)) {
450 // Strip the common prefix (if it is more than just "/") from current
451 // directory and FileName for a more space-efficient encoding.
452 auto FileIt = llvm::sys::path::begin(RemappedFile);
453 auto FileE = llvm::sys::path::end(RemappedFile);
454 auto CurDirIt = llvm::sys::path::begin(CurDir);
455 auto CurDirE = llvm::sys::path::end(CurDir);
456 for (; CurDirIt != CurDirE && *CurDirIt == *FileIt; ++CurDirIt, ++FileIt)
457 llvm::sys::path::append(DirBuf, *CurDirIt);
458 if (std::distance(llvm::sys::path::begin(CurDir), CurDirIt) == 1) {
459 // Don't strip the common prefix if it is only the root "/"
460 // since that would make LLVM diagnostic locations confusing.
461 Dir = {};
462 File = RemappedFile;
463 } else {
464 for (; FileIt != FileE; ++FileIt)
465 llvm::sys::path::append(FileBuf, *FileIt);
466 Dir = DirBuf;
467 File = FileBuf;
468 }
469 } else {
470 Dir = CurDir;
471 File = RemappedFile;
472 }
473 llvm::DIFile *F = DBuilder.createFile(File, Dir, CSInfo, Source);
474 DIFileCache[FileName.data()].reset(F);
475 return F;
476}
477
478std::string CGDebugInfo::remapDIPath(StringRef Path) const {
479 if (DebugPrefixMap.empty())
480 return Path.str();
481
482 SmallString<256> P = Path;
483 for (const auto &Entry : DebugPrefixMap)
484 if (llvm::sys::path::replace_path_prefix(P, Entry.first, Entry.second))
485 break;
486 return P.str().str();
487}
488
489unsigned CGDebugInfo::getLineNumber(SourceLocation Loc) {
490 if (Loc.isInvalid() && CurLoc.isInvalid())
491 return 0;
492 SourceManager &SM = CGM.getContext().getSourceManager();
493 PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
494 return PLoc.isValid() ? PLoc.getLine() : 0;
495}
496
497unsigned CGDebugInfo::getColumnNumber(SourceLocation Loc, bool Force) {
498 // We may not want column information at all.
499 if (!Force && !CGM.getCodeGenOpts().DebugColumnInfo)
500 return 0;
501
502 // If the location is invalid then use the current column.
503 if (Loc.isInvalid() && CurLoc.isInvalid())
504 return 0;
505 SourceManager &SM = CGM.getContext().getSourceManager();
506 PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
507 return PLoc.isValid() ? PLoc.getColumn() : 0;
508}
509
510StringRef CGDebugInfo::getCurrentDirname() {
511 if (!CGM.getCodeGenOpts().DebugCompilationDir.empty())
512 return CGM.getCodeGenOpts().DebugCompilationDir;
513
514 if (!CWDName.empty())
515 return CWDName;
516 SmallString<256> CWD;
517 llvm::sys::fs::current_path(CWD);
518 return CWDName = internString(CWD);
519}
520
521void CGDebugInfo::CreateCompileUnit() {
522 SmallString<32> Checksum;
523 Optional<llvm::DIFile::ChecksumKind> CSKind;
524 Optional<llvm::DIFile::ChecksumInfo<StringRef>> CSInfo;
525
526 // Should we be asking the SourceManager for the main file name, instead of
527 // accepting it as an argument? This just causes the main file name to
528 // mismatch with source locations and create extra lexical scopes or
529 // mismatched debug info (a CU with a DW_AT_file of "-", because that's what
530 // the driver passed, but functions/other things have DW_AT_file of "<stdin>"
531 // because that's what the SourceManager says)
532
533 // Get absolute path name.
534 SourceManager &SM = CGM.getContext().getSourceManager();
535 std::string MainFileName = CGM.getCodeGenOpts().MainFileName;
536 if (MainFileName.empty())
537 MainFileName = "<stdin>";
538
539 // The main file name provided via the "-main-file-name" option contains just
540 // the file name itself with no path information. This file name may have had
541 // a relative path, so we look into the actual file entry for the main
542 // file to determine the real absolute path for the file.
543 std::string MainFileDir;
544 if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
545 MainFileDir = std::string(MainFile->getDir()->getName());
546 if (!llvm::sys::path::is_absolute(MainFileName)) {
547 llvm::SmallString<1024> MainFileDirSS(MainFileDir);
548 llvm::sys::path::append(MainFileDirSS, MainFileName);
549 MainFileName =
550 std::string(llvm::sys::path::remove_leading_dotslash(MainFileDirSS));
551 }
552 // If the main file name provided is identical to the input file name, and
553 // if the input file is a preprocessed source, use the module name for
554 // debug info. The module name comes from the name specified in the first
555 // linemarker if the input is a preprocessed source.
556 if (MainFile->getName() == MainFileName &&
557 FrontendOptions::getInputKindForExtension(
558 MainFile->getName().rsplit('.').second)
559 .isPreprocessed())
560 MainFileName = CGM.getModule().getName().str();
561
562 CSKind = computeChecksum(SM.getMainFileID(), Checksum);
563 }
564
565 llvm::dwarf::SourceLanguage LangTag;
566 const LangOptions &LO = CGM.getLangOpts();
567 if (LO.CPlusPlus) {
568 if (LO.ObjC)
569 LangTag = llvm::dwarf::DW_LANG_ObjC_plus_plus;
570 else if (LO.CPlusPlus14)
571 LangTag = llvm::dwarf::DW_LANG_C_plus_plus_14;
572 else if (LO.CPlusPlus11)
573 LangTag = llvm::dwarf::DW_LANG_C_plus_plus_11;
574 else
575 LangTag = llvm::dwarf::DW_LANG_C_plus_plus;
576 } else if (LO.ObjC) {
577 LangTag = llvm::dwarf::DW_LANG_ObjC;
578 } else if (LO.RenderScript) {
579 LangTag = llvm::dwarf::DW_LANG_GOOGLE_RenderScript;
580 } else if (LO.C99) {
581 LangTag = llvm::dwarf::DW_LANG_C99;
582 } else {
583 LangTag = llvm::dwarf::DW_LANG_C89;
584 }
585
586 std::string Producer = getClangFullVersion();
587
588 // Figure out which version of the ObjC runtime we have.
589 unsigned RuntimeVers = 0;
590 if (LO.ObjC)
591 RuntimeVers = LO.ObjCRuntime.isNonFragile() ? 2 : 1;
592
593 llvm::DICompileUnit::DebugEmissionKind EmissionKind;
594 switch (DebugKind) {
595 case codegenoptions::NoDebugInfo:
596 case codegenoptions::LocTrackingOnly:
597 EmissionKind = llvm::DICompileUnit::NoDebug;
598 break;
599 case codegenoptions::DebugLineTablesOnly:
600 EmissionKind = llvm::DICompileUnit::LineTablesOnly;
601 break;
602 case codegenoptions::DebugDirectivesOnly:
603 EmissionKind = llvm::DICompileUnit::DebugDirectivesOnly;
604 break;
605 case codegenoptions::DebugInfoConstructor:
606 case codegenoptions::LimitedDebugInfo:
607 case codegenoptions::FullDebugInfo:
608 case codegenoptions::UnusedTypeInfo:
609 EmissionKind = llvm::DICompileUnit::FullDebug;
610 break;
611 }
612
613 uint64_t DwoId = 0;
614 auto &CGOpts = CGM.getCodeGenOpts();
615 // The DIFile used by the CU is distinct from the main source
616 // file. Its directory part specifies what becomes the
617 // DW_AT_comp_dir (the compilation directory), even if the source
618 // file was specified with an absolute path.
619 if (CSKind)
620 CSInfo.emplace(*CSKind, Checksum);
621 llvm::DIFile *CUFile = DBuilder.createFile(
622 remapDIPath(MainFileName), remapDIPath(getCurrentDirname()), CSInfo,
623 getSource(SM, SM.getMainFileID()));
624
625 StringRef Sysroot, SDK;
626 if (CGM.getCodeGenOpts().getDebuggerTuning() == llvm::DebuggerKind::LLDB) {
627 Sysroot = CGM.getHeaderSearchOpts().Sysroot;
628 auto B = llvm::sys::path::rbegin(Sysroot);
629 auto E = llvm::sys::path::rend(Sysroot);
630 auto It = std::find_if(B, E, [](auto SDK) { return SDK.endswith(".sdk"); });
631 if (It != E)
632 SDK = *It;
633 }
634
635 // Create new compile unit.
636 TheCU = DBuilder.createCompileUnit(
637 LangTag, CUFile, CGOpts.EmitVersionIdentMetadata ? Producer : "",
638 LO.Optimize || CGOpts.PrepareForLTO || CGOpts.PrepareForThinLTO,
639 CGOpts.DwarfDebugFlags, RuntimeVers, CGOpts.SplitDwarfFile, EmissionKind,
640 DwoId, CGOpts.SplitDwarfInlining, CGOpts.DebugInfoForProfiling,
641 CGM.getTarget().getTriple().isNVPTX()
642 ? llvm::DICompileUnit::DebugNameTableKind::None
643 : static_cast<llvm::DICompileUnit::DebugNameTableKind>(
644 CGOpts.DebugNameTable),
645 CGOpts.DebugRangesBaseAddress, remapDIPath(Sysroot), SDK);
646}
647
648llvm::DIType *CGDebugInfo::CreateType(const BuiltinType *BT) {
649 llvm::dwarf::TypeKind Encoding;
650 StringRef BTName;
651 switch (BT->getKind()) {
652#define BUILTIN_TYPE(Id, SingletonId)
653#define PLACEHOLDER_TYPE(Id, SingletonId) case BuiltinType::Id:
654#include "clang/AST/BuiltinTypes.def"
655 case BuiltinType::Dependent:
656 llvm_unreachable("Unexpected builtin type")::llvm::llvm_unreachable_internal("Unexpected builtin type", "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 656)
;
657 case BuiltinType::NullPtr:
658 return DBuilder.createNullPtrType();
659 case BuiltinType::Void:
660 return nullptr;
661 case BuiltinType::ObjCClass:
662 if (!ClassTy)
663 ClassTy =
664 DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
665 "objc_class", TheCU, TheCU->getFile(), 0);
666 return ClassTy;
667 case BuiltinType::ObjCId: {
668 // typedef struct objc_class *Class;
669 // typedef struct objc_object {
670 // Class isa;
671 // } *id;
672
673 if (ObjTy)
674 return ObjTy;
675
676 if (!ClassTy)
677 ClassTy =
678 DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
679 "objc_class", TheCU, TheCU->getFile(), 0);
680
681 unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
682
683 auto *ISATy = DBuilder.createPointerType(ClassTy, Size);
684
685 ObjTy = DBuilder.createStructType(TheCU, "objc_object", TheCU->getFile(), 0,
686 0, 0, llvm::DINode::FlagZero, nullptr,
687 llvm::DINodeArray());
688
689 DBuilder.replaceArrays(
690 ObjTy, DBuilder.getOrCreateArray(&*DBuilder.createMemberType(
691 ObjTy, "isa", TheCU->getFile(), 0, Size, 0, 0,
692 llvm::DINode::FlagZero, ISATy)));
693 return ObjTy;
694 }
695 case BuiltinType::ObjCSel: {
696 if (!SelTy)
697 SelTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
698 "objc_selector", TheCU,
699 TheCU->getFile(), 0);
700 return SelTy;
701 }
702
703#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
704 case BuiltinType::Id: \
705 return getOrCreateStructPtrType("opencl_" #ImgType "_" #Suffix "_t", \
706 SingletonId);
707#include "clang/Basic/OpenCLImageTypes.def"
708 case BuiltinType::OCLSampler:
709 return getOrCreateStructPtrType("opencl_sampler_t", OCLSamplerDITy);
710 case BuiltinType::OCLEvent:
711 return getOrCreateStructPtrType("opencl_event_t", OCLEventDITy);
712 case BuiltinType::OCLClkEvent:
713 return getOrCreateStructPtrType("opencl_clk_event_t", OCLClkEventDITy);
714 case BuiltinType::OCLQueue:
715 return getOrCreateStructPtrType("opencl_queue_t", OCLQueueDITy);
716 case BuiltinType::OCLReserveID:
717 return getOrCreateStructPtrType("opencl_reserve_id_t", OCLReserveIDDITy);
718#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
719 case BuiltinType::Id: \
720 return getOrCreateStructPtrType("opencl_" #ExtType, Id##Ty);
721#include "clang/Basic/OpenCLExtensionTypes.def"
722
723#define SVE_TYPE(Name, Id, SingletonId) case BuiltinType::Id:
724#include "clang/Basic/AArch64SVEACLETypes.def"
725 {
726 ASTContext::BuiltinVectorTypeInfo Info =
727 CGM.getContext().getBuiltinVectorTypeInfo(BT);
728 unsigned NumElemsPerVG = (Info.EC.getKnownMinValue() * Info.NumVectors) / 2;
729
730 // Debuggers can't extract 1bit from a vector, so will display a
731 // bitpattern for svbool_t instead.
732 if (Info.ElementType == CGM.getContext().BoolTy) {
733 NumElemsPerVG /= 8;
734 Info.ElementType = CGM.getContext().UnsignedCharTy;
735 }
736
737 auto *LowerBound =
738 llvm::ConstantAsMetadata::get(llvm::ConstantInt::getSigned(
739 llvm::Type::getInt64Ty(CGM.getLLVMContext()), 0));
740 SmallVector<int64_t, 9> Expr(
741 {llvm::dwarf::DW_OP_constu, NumElemsPerVG, llvm::dwarf::DW_OP_bregx,
742 /* AArch64::VG */ 46, 0, llvm::dwarf::DW_OP_mul,
743 llvm::dwarf::DW_OP_constu, 1, llvm::dwarf::DW_OP_minus});
744 auto *UpperBound = DBuilder.createExpression(Expr);
745
746 llvm::Metadata *Subscript = DBuilder.getOrCreateSubrange(
747 /*count*/ nullptr, LowerBound, UpperBound, /*stride*/ nullptr);
748 llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscript);
749 llvm::DIType *ElemTy =
750 getOrCreateType(Info.ElementType, TheCU->getFile());
751 auto Align = getTypeAlignIfRequired(BT, CGM.getContext());
752 return DBuilder.createVectorType(/*Size*/ 0, Align, ElemTy,
753 SubscriptArray);
754 }
755 case BuiltinType::UChar:
756 case BuiltinType::Char_U:
757 Encoding = llvm::dwarf::DW_ATE_unsigned_char;
758 break;
759 case BuiltinType::Char_S:
760 case BuiltinType::SChar:
761 Encoding = llvm::dwarf::DW_ATE_signed_char;
762 break;
763 case BuiltinType::Char8:
764 case BuiltinType::Char16:
765 case BuiltinType::Char32:
766 Encoding = llvm::dwarf::DW_ATE_UTF;
767 break;
768 case BuiltinType::UShort:
769 case BuiltinType::UInt:
770 case BuiltinType::UInt128:
771 case BuiltinType::ULong:
772 case BuiltinType::WChar_U:
773 case BuiltinType::ULongLong:
774 Encoding = llvm::dwarf::DW_ATE_unsigned;
775 break;
776 case BuiltinType::Short:
777 case BuiltinType::Int:
778 case BuiltinType::Int128:
779 case BuiltinType::Long:
780 case BuiltinType::WChar_S:
781 case BuiltinType::LongLong:
782 Encoding = llvm::dwarf::DW_ATE_signed;
783 break;
784 case BuiltinType::Bool:
785 Encoding = llvm::dwarf::DW_ATE_boolean;
786 break;
787 case BuiltinType::Half:
788 case BuiltinType::Float:
789 case BuiltinType::LongDouble:
790 case BuiltinType::Float16:
791 case BuiltinType::BFloat16:
792 case BuiltinType::Float128:
793 case BuiltinType::Double:
794 // FIXME: For targets where long double and __float128 have the same size,
795 // they are currently indistinguishable in the debugger without some
796 // special treatment. However, there is currently no consensus on encoding
797 // and this should be updated once a DWARF encoding exists for distinct
798 // floating point types of the same size.
799 Encoding = llvm::dwarf::DW_ATE_float;
800 break;
801 case BuiltinType::ShortAccum:
802 case BuiltinType::Accum:
803 case BuiltinType::LongAccum:
804 case BuiltinType::ShortFract:
805 case BuiltinType::Fract:
806 case BuiltinType::LongFract:
807 case BuiltinType::SatShortFract:
808 case BuiltinType::SatFract:
809 case BuiltinType::SatLongFract:
810 case BuiltinType::SatShortAccum:
811 case BuiltinType::SatAccum:
812 case BuiltinType::SatLongAccum:
813 Encoding = llvm::dwarf::DW_ATE_signed_fixed;
814 break;
815 case BuiltinType::UShortAccum:
816 case BuiltinType::UAccum:
817 case BuiltinType::ULongAccum:
818 case BuiltinType::UShortFract:
819 case BuiltinType::UFract:
820 case BuiltinType::ULongFract:
821 case BuiltinType::SatUShortAccum:
822 case BuiltinType::SatUAccum:
823 case BuiltinType::SatULongAccum:
824 case BuiltinType::SatUShortFract:
825 case BuiltinType::SatUFract:
826 case BuiltinType::SatULongFract:
827 Encoding = llvm::dwarf::DW_ATE_unsigned_fixed;
828 break;
829 }
830
831 switch (BT->getKind()) {
832 case BuiltinType::Long:
833 BTName = "long int";
834 break;
835 case BuiltinType::LongLong:
836 BTName = "long long int";
837 break;
838 case BuiltinType::ULong:
839 BTName = "long unsigned int";
840 break;
841 case BuiltinType::ULongLong:
842 BTName = "long long unsigned int";
843 break;
844 default:
845 BTName = BT->getName(CGM.getLangOpts());
846 break;
847 }
848 // Bit size and offset of the type.
849 uint64_t Size = CGM.getContext().getTypeSize(BT);
850 return DBuilder.createBasicType(BTName, Size, Encoding);
851}
852
853llvm::DIType *CGDebugInfo::CreateType(const AutoType *Ty) {
854 return DBuilder.createUnspecifiedType("auto");
855}
856
857llvm::DIType *CGDebugInfo::CreateType(const ExtIntType *Ty) {
858
859 StringRef Name = Ty->isUnsigned() ? "unsigned _ExtInt" : "_ExtInt";
860 llvm::dwarf::TypeKind Encoding = Ty->isUnsigned()
861 ? llvm::dwarf::DW_ATE_unsigned
862 : llvm::dwarf::DW_ATE_signed;
863
864 return DBuilder.createBasicType(Name, CGM.getContext().getTypeSize(Ty),
865 Encoding);
866}
867
868llvm::DIType *CGDebugInfo::CreateType(const ComplexType *Ty) {
869 // Bit size and offset of the type.
870 llvm::dwarf::TypeKind Encoding = llvm::dwarf::DW_ATE_complex_float;
871 if (Ty->isComplexIntegerType())
872 Encoding = llvm::dwarf::DW_ATE_lo_user;
873
874 uint64_t Size = CGM.getContext().getTypeSize(Ty);
875 return DBuilder.createBasicType("complex", Size, Encoding);
876}
877
878llvm::DIType *CGDebugInfo::CreateQualifiedType(QualType Ty,
879 llvm::DIFile *Unit) {
880 QualifierCollector Qc;
881 const Type *T = Qc.strip(Ty);
882
883 // Ignore these qualifiers for now.
884 Qc.removeObjCGCAttr();
885 Qc.removeAddressSpace();
886 Qc.removeObjCLifetime();
887
888 // We will create one Derived type for one qualifier and recurse to handle any
889 // additional ones.
890 llvm::dwarf::Tag Tag;
891 if (Qc.hasConst()) {
892 Tag = llvm::dwarf::DW_TAG_const_type;
893 Qc.removeConst();
894 } else if (Qc.hasVolatile()) {
895 Tag = llvm::dwarf::DW_TAG_volatile_type;
896 Qc.removeVolatile();
897 } else if (Qc.hasRestrict()) {
898 Tag = llvm::dwarf::DW_TAG_restrict_type;
899 Qc.removeRestrict();
900 } else {
901 assert(Qc.empty() && "Unknown type qualifier for debug info")((Qc.empty() && "Unknown type qualifier for debug info"
) ? static_cast<void> (0) : __assert_fail ("Qc.empty() && \"Unknown type qualifier for debug info\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 901, __PRETTY_FUNCTION__))
;
902 return getOrCreateType(QualType(T, 0), Unit);
903 }
904
905 auto *FromTy = getOrCreateType(Qc.apply(CGM.getContext(), T), Unit);
906
907 // No need to fill in the Name, Line, Size, Alignment, Offset in case of
908 // CVR derived types.
909 return DBuilder.createQualifiedType(Tag, FromTy);
910}
911
912llvm::DIType *CGDebugInfo::CreateType(const ObjCObjectPointerType *Ty,
913 llvm::DIFile *Unit) {
914
915 // The frontend treats 'id' as a typedef to an ObjCObjectType,
916 // whereas 'id<protocol>' is treated as an ObjCPointerType. For the
917 // debug info, we want to emit 'id' in both cases.
918 if (Ty->isObjCQualifiedIdType())
919 return getOrCreateType(CGM.getContext().getObjCIdType(), Unit);
920
921 return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
922 Ty->getPointeeType(), Unit);
923}
924
925llvm::DIType *CGDebugInfo::CreateType(const PointerType *Ty,
926 llvm::DIFile *Unit) {
927 return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
928 Ty->getPointeeType(), Unit);
929}
930
931/// \return whether a C++ mangling exists for the type defined by TD.
932static bool hasCXXMangling(const TagDecl *TD, llvm::DICompileUnit *TheCU) {
933 switch (TheCU->getSourceLanguage()) {
934 case llvm::dwarf::DW_LANG_C_plus_plus:
935 case llvm::dwarf::DW_LANG_C_plus_plus_11:
936 case llvm::dwarf::DW_LANG_C_plus_plus_14:
937 return true;
938 case llvm::dwarf::DW_LANG_ObjC_plus_plus:
939 return isa<CXXRecordDecl>(TD) || isa<EnumDecl>(TD);
940 default:
941 return false;
942 }
943}
944
945// Determines if the debug info for this tag declaration needs a type
946// identifier. The purpose of the unique identifier is to deduplicate type
947// information for identical types across TUs. Because of the C++ one definition
948// rule (ODR), it is valid to assume that the type is defined the same way in
949// every TU and its debug info is equivalent.
950//
951// C does not have the ODR, and it is common for codebases to contain multiple
952// different definitions of a struct with the same name in different TUs.
953// Therefore, if the type doesn't have a C++ mangling, don't give it an
954// identifer. Type information in C is smaller and simpler than C++ type
955// information, so the increase in debug info size is negligible.
956//
957// If the type is not externally visible, it should be unique to the current TU,
958// and should not need an identifier to participate in type deduplication.
959// However, when emitting CodeView, the format internally uses these
960// unique type name identifers for references between debug info. For example,
961// the method of a class in an anonymous namespace uses the identifer to refer
962// to its parent class. The Microsoft C++ ABI attempts to provide unique names
963// for such types, so when emitting CodeView, always use identifiers for C++
964// types. This may create problems when attempting to emit CodeView when the MS
965// C++ ABI is not in use.
966static bool needsTypeIdentifier(const TagDecl *TD, CodeGenModule &CGM,
967 llvm::DICompileUnit *TheCU) {
968 // We only add a type identifier for types with C++ name mangling.
969 if (!hasCXXMangling(TD, TheCU))
970 return false;
971
972 // Externally visible types with C++ mangling need a type identifier.
973 if (TD->isExternallyVisible())
974 return true;
975
976 // CodeView types with C++ mangling need a type identifier.
977 if (CGM.getCodeGenOpts().EmitCodeView)
978 return true;
979
980 return false;
981}
982
983// Returns a unique type identifier string if one exists, or an empty string.
984static SmallString<256> getTypeIdentifier(const TagType *Ty, CodeGenModule &CGM,
985 llvm::DICompileUnit *TheCU) {
986 SmallString<256> Identifier;
987 const TagDecl *TD = Ty->getDecl();
988
989 if (!needsTypeIdentifier(TD, CGM, TheCU))
990 return Identifier;
991 if (const auto *RD = dyn_cast<CXXRecordDecl>(TD))
992 if (RD->getDefinition())
993 if (RD->isDynamicClass() &&
994 CGM.getVTableLinkage(RD) == llvm::GlobalValue::ExternalLinkage)
995 return Identifier;
996
997 // TODO: This is using the RTTI name. Is there a better way to get
998 // a unique string for a type?
999 llvm::raw_svector_ostream Out(Identifier);
1000 CGM.getCXXABI().getMangleContext().mangleCXXRTTIName(QualType(Ty, 0), Out);
1001 return Identifier;
1002}
1003
1004/// \return the appropriate DWARF tag for a composite type.
1005static llvm::dwarf::Tag getTagForRecord(const RecordDecl *RD) {
1006 llvm::dwarf::Tag Tag;
1007 if (RD->isStruct() || RD->isInterface())
1008 Tag = llvm::dwarf::DW_TAG_structure_type;
1009 else if (RD->isUnion())
1010 Tag = llvm::dwarf::DW_TAG_union_type;
1011 else {
1012 // FIXME: This could be a struct type giving a default visibility different
1013 // than C++ class type, but needs llvm metadata changes first.
1014 assert(RD->isClass())((RD->isClass()) ? static_cast<void> (0) : __assert_fail
("RD->isClass()", "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1014, __PRETTY_FUNCTION__))
;
1015 Tag = llvm::dwarf::DW_TAG_class_type;
1016 }
1017 return Tag;
1018}
1019
1020llvm::DICompositeType *
1021CGDebugInfo::getOrCreateRecordFwdDecl(const RecordType *Ty,
1022 llvm::DIScope *Ctx) {
1023 const RecordDecl *RD = Ty->getDecl();
1024 if (llvm::DIType *T = getTypeOrNull(CGM.getContext().getRecordType(RD)))
1025 return cast<llvm::DICompositeType>(T);
1026 llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
1027 unsigned Line = getLineNumber(RD->getLocation());
1028 StringRef RDName = getClassName(RD);
1029
1030 uint64_t Size = 0;
1031 uint32_t Align = 0;
1032
1033 const RecordDecl *D = RD->getDefinition();
1034 if (D && D->isCompleteDefinition())
1035 Size = CGM.getContext().getTypeSize(Ty);
1036
1037 llvm::DINode::DIFlags Flags = llvm::DINode::FlagFwdDecl;
1038
1039 // Add flag to nontrivial forward declarations. To be consistent with MSVC,
1040 // add the flag if a record has no definition because we don't know whether
1041 // it will be trivial or not.
1042 if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD))
1043 if (!CXXRD->hasDefinition() ||
1044 (CXXRD->hasDefinition() && !CXXRD->isTrivial()))
1045 Flags |= llvm::DINode::FlagNonTrivial;
1046
1047 // Create the type.
1048 SmallString<256> Identifier = getTypeIdentifier(Ty, CGM, TheCU);
1049 llvm::DICompositeType *RetTy = DBuilder.createReplaceableCompositeType(
1050 getTagForRecord(RD), RDName, Ctx, DefUnit, Line, 0, Size, Align, Flags,
1051 Identifier);
1052 if (CGM.getCodeGenOpts().DebugFwdTemplateParams)
1053 if (auto *TSpecial = dyn_cast<ClassTemplateSpecializationDecl>(RD))
1054 DBuilder.replaceArrays(RetTy, llvm::DINodeArray(),
1055 CollectCXXTemplateParams(TSpecial, DefUnit));
1056 ReplaceMap.emplace_back(
1057 std::piecewise_construct, std::make_tuple(Ty),
1058 std::make_tuple(static_cast<llvm::Metadata *>(RetTy)));
1059 return RetTy;
1060}
1061
1062llvm::DIType *CGDebugInfo::CreatePointerLikeType(llvm::dwarf::Tag Tag,
1063 const Type *Ty,
1064 QualType PointeeTy,
1065 llvm::DIFile *Unit) {
1066 // Bit size, align and offset of the type.
1067 // Size is always the size of a pointer. We can't use getTypeSize here
1068 // because that does not return the correct value for references.
1069 unsigned AddressSpace = CGM.getContext().getTargetAddressSpace(PointeeTy);
1070 uint64_t Size = CGM.getTarget().getPointerWidth(AddressSpace);
1071 auto Align = getTypeAlignIfRequired(Ty, CGM.getContext());
1072 Optional<unsigned> DWARFAddressSpace =
1073 CGM.getTarget().getDWARFAddressSpace(AddressSpace);
1074
1075 if (Tag == llvm::dwarf::DW_TAG_reference_type ||
1076 Tag == llvm::dwarf::DW_TAG_rvalue_reference_type)
1077 return DBuilder.createReferenceType(Tag, getOrCreateType(PointeeTy, Unit),
1078 Size, Align, DWARFAddressSpace);
1079 else
1080 return DBuilder.createPointerType(getOrCreateType(PointeeTy, Unit), Size,
1081 Align, DWARFAddressSpace);
1082}
1083
1084llvm::DIType *CGDebugInfo::getOrCreateStructPtrType(StringRef Name,
1085 llvm::DIType *&Cache) {
1086 if (Cache)
1087 return Cache;
1088 Cache = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type, Name,
1089 TheCU, TheCU->getFile(), 0);
1090 unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
1091 Cache = DBuilder.createPointerType(Cache, Size);
1092 return Cache;
1093}
1094
1095uint64_t CGDebugInfo::collectDefaultElementTypesForBlockPointer(
1096 const BlockPointerType *Ty, llvm::DIFile *Unit, llvm::DIDerivedType *DescTy,
1097 unsigned LineNo, SmallVectorImpl<llvm::Metadata *> &EltTys) {
1098 QualType FType;
1099
1100 // Advanced by calls to CreateMemberType in increments of FType, then
1101 // returned as the overall size of the default elements.
1102 uint64_t FieldOffset = 0;
1103
1104 // Blocks in OpenCL have unique constraints which make the standard fields
1105 // redundant while requiring size and align fields for enqueue_kernel. See
1106 // initializeForBlockHeader in CGBlocks.cpp
1107 if (CGM.getLangOpts().OpenCL) {
1108 FType = CGM.getContext().IntTy;
1109 EltTys.push_back(CreateMemberType(Unit, FType, "__size", &FieldOffset));
1110 EltTys.push_back(CreateMemberType(Unit, FType, "__align", &FieldOffset));
1111 } else {
1112 FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
1113 EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
1114 FType = CGM.getContext().IntTy;
1115 EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
1116 EltTys.push_back(CreateMemberType(Unit, FType, "__reserved", &FieldOffset));
1117 FType = CGM.getContext().getPointerType(Ty->getPointeeType());
1118 EltTys.push_back(CreateMemberType(Unit, FType, "__FuncPtr", &FieldOffset));
1119 FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
1120 uint64_t FieldSize = CGM.getContext().getTypeSize(Ty);
1121 uint32_t FieldAlign = CGM.getContext().getTypeAlign(Ty);
1122 EltTys.push_back(DBuilder.createMemberType(
1123 Unit, "__descriptor", nullptr, LineNo, FieldSize, FieldAlign,
1124 FieldOffset, llvm::DINode::FlagZero, DescTy));
1125 FieldOffset += FieldSize;
1126 }
1127
1128 return FieldOffset;
1129}
1130
1131llvm::DIType *CGDebugInfo::CreateType(const BlockPointerType *Ty,
1132 llvm::DIFile *Unit) {
1133 SmallVector<llvm::Metadata *, 8> EltTys;
1134 QualType FType;
1135 uint64_t FieldOffset;
1136 llvm::DINodeArray Elements;
1137
1138 FieldOffset = 0;
1139 FType = CGM.getContext().UnsignedLongTy;
1140 EltTys.push_back(CreateMemberType(Unit, FType, "reserved", &FieldOffset));
1141 EltTys.push_back(CreateMemberType(Unit, FType, "Size", &FieldOffset));
1142
1143 Elements = DBuilder.getOrCreateArray(EltTys);
1144 EltTys.clear();
1145
1146 llvm::DINode::DIFlags Flags = llvm::DINode::FlagAppleBlock;
1147
1148 auto *EltTy =
1149 DBuilder.createStructType(Unit, "__block_descriptor", nullptr, 0,
1150 FieldOffset, 0, Flags, nullptr, Elements);
1151
1152 // Bit size, align and offset of the type.
1153 uint64_t Size = CGM.getContext().getTypeSize(Ty);
1154
1155 auto *DescTy = DBuilder.createPointerType(EltTy, Size);
1156
1157 FieldOffset = collectDefaultElementTypesForBlockPointer(Ty, Unit, DescTy,
1158 0, EltTys);
1159
1160 Elements = DBuilder.getOrCreateArray(EltTys);
1161
1162 // The __block_literal_generic structs are marked with a special
1163 // DW_AT_APPLE_BLOCK attribute and are an implementation detail only
1164 // the debugger needs to know about. To allow type uniquing, emit
1165 // them without a name or a location.
1166 EltTy = DBuilder.createStructType(Unit, "", nullptr, 0, FieldOffset, 0,
1167 Flags, nullptr, Elements);
1168
1169 return DBuilder.createPointerType(EltTy, Size);
1170}
1171
1172llvm::DIType *CGDebugInfo::CreateType(const TemplateSpecializationType *Ty,
1173 llvm::DIFile *Unit) {
1174 assert(Ty->isTypeAlias())((Ty->isTypeAlias()) ? static_cast<void> (0) : __assert_fail
("Ty->isTypeAlias()", "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1174, __PRETTY_FUNCTION__))
;
1175 llvm::DIType *Src = getOrCreateType(Ty->getAliasedType(), Unit);
1176
1177 auto *AliasDecl =
1178 cast<TypeAliasTemplateDecl>(Ty->getTemplateName().getAsTemplateDecl())
1179 ->getTemplatedDecl();
1180
1181 if (AliasDecl->hasAttr<NoDebugAttr>())
1182 return Src;
1183
1184 SmallString<128> NS;
1185 llvm::raw_svector_ostream OS(NS);
1186 Ty->getTemplateName().print(OS, getPrintingPolicy(), /*qualified*/ false);
1187 printTemplateArgumentList(OS, Ty->template_arguments(), getPrintingPolicy());
1188
1189 SourceLocation Loc = AliasDecl->getLocation();
1190 return DBuilder.createTypedef(Src, OS.str(), getOrCreateFile(Loc),
1191 getLineNumber(Loc),
1192 getDeclContextDescriptor(AliasDecl));
1193}
1194
1195llvm::DIType *CGDebugInfo::CreateType(const TypedefType *Ty,
1196 llvm::DIFile *Unit) {
1197 llvm::DIType *Underlying =
1198 getOrCreateType(Ty->getDecl()->getUnderlyingType(), Unit);
1199
1200 if (Ty->getDecl()->hasAttr<NoDebugAttr>())
1201 return Underlying;
1202
1203 // We don't set size information, but do specify where the typedef was
1204 // declared.
1205 SourceLocation Loc = Ty->getDecl()->getLocation();
1206
1207 uint32_t Align = getDeclAlignIfRequired(Ty->getDecl(), CGM.getContext());
1208 // Typedefs are derived from some other type.
1209 return DBuilder.createTypedef(Underlying, Ty->getDecl()->getName(),
1210 getOrCreateFile(Loc), getLineNumber(Loc),
1211 getDeclContextDescriptor(Ty->getDecl()), Align);
1212}
1213
1214static unsigned getDwarfCC(CallingConv CC) {
1215 switch (CC) {
1216 case CC_C:
1217 // Avoid emitting DW_AT_calling_convention if the C convention was used.
1218 return 0;
1219
1220 case CC_X86StdCall:
1221 return llvm::dwarf::DW_CC_BORLAND_stdcall;
1222 case CC_X86FastCall:
1223 return llvm::dwarf::DW_CC_BORLAND_msfastcall;
1224 case CC_X86ThisCall:
1225 return llvm::dwarf::DW_CC_BORLAND_thiscall;
1226 case CC_X86VectorCall:
1227 return llvm::dwarf::DW_CC_LLVM_vectorcall;
1228 case CC_X86Pascal:
1229 return llvm::dwarf::DW_CC_BORLAND_pascal;
1230 case CC_Win64:
1231 return llvm::dwarf::DW_CC_LLVM_Win64;
1232 case CC_X86_64SysV:
1233 return llvm::dwarf::DW_CC_LLVM_X86_64SysV;
1234 case CC_AAPCS:
1235 case CC_AArch64VectorCall:
1236 return llvm::dwarf::DW_CC_LLVM_AAPCS;
1237 case CC_AAPCS_VFP:
1238 return llvm::dwarf::DW_CC_LLVM_AAPCS_VFP;
1239 case CC_IntelOclBicc:
1240 return llvm::dwarf::DW_CC_LLVM_IntelOclBicc;
1241 case CC_SpirFunction:
1242 return llvm::dwarf::DW_CC_LLVM_SpirFunction;
1243 case CC_OpenCLKernel:
1244 return llvm::dwarf::DW_CC_LLVM_OpenCLKernel;
1245 case CC_Swift:
1246 return llvm::dwarf::DW_CC_LLVM_Swift;
1247 case CC_PreserveMost:
1248 return llvm::dwarf::DW_CC_LLVM_PreserveMost;
1249 case CC_PreserveAll:
1250 return llvm::dwarf::DW_CC_LLVM_PreserveAll;
1251 case CC_X86RegCall:
1252 return llvm::dwarf::DW_CC_LLVM_X86RegCall;
1253 }
1254 return 0;
1255}
1256
1257llvm::DIType *CGDebugInfo::CreateType(const FunctionType *Ty,
1258 llvm::DIFile *Unit) {
1259 SmallVector<llvm::Metadata *, 16> EltTys;
1260
1261 // Add the result type at least.
1262 EltTys.push_back(getOrCreateType(Ty->getReturnType(), Unit));
1263
1264 // Set up remainder of arguments if there is a prototype.
1265 // otherwise emit it as a variadic function.
1266 if (isa<FunctionNoProtoType>(Ty))
1267 EltTys.push_back(DBuilder.createUnspecifiedParameter());
1268 else if (const auto *FPT = dyn_cast<FunctionProtoType>(Ty)) {
1269 for (const QualType &ParamType : FPT->param_types())
1270 EltTys.push_back(getOrCreateType(ParamType, Unit));
1271 if (FPT->isVariadic())
1272 EltTys.push_back(DBuilder.createUnspecifiedParameter());
1273 }
1274
1275 llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(EltTys);
1276 return DBuilder.createSubroutineType(EltTypeArray, llvm::DINode::FlagZero,
1277 getDwarfCC(Ty->getCallConv()));
1278}
1279
1280/// Convert an AccessSpecifier into the corresponding DINode flag.
1281/// As an optimization, return 0 if the access specifier equals the
1282/// default for the containing type.
1283static llvm::DINode::DIFlags getAccessFlag(AccessSpecifier Access,
1284 const RecordDecl *RD) {
1285 AccessSpecifier Default = clang::AS_none;
1286 if (RD && RD->isClass())
1287 Default = clang::AS_private;
1288 else if (RD && (RD->isStruct() || RD->isUnion()))
1289 Default = clang::AS_public;
1290
1291 if (Access == Default)
1292 return llvm::DINode::FlagZero;
1293
1294 switch (Access) {
1295 case clang::AS_private:
1296 return llvm::DINode::FlagPrivate;
1297 case clang::AS_protected:
1298 return llvm::DINode::FlagProtected;
1299 case clang::AS_public:
1300 return llvm::DINode::FlagPublic;
1301 case clang::AS_none:
1302 return llvm::DINode::FlagZero;
1303 }
1304 llvm_unreachable("unexpected access enumerator")::llvm::llvm_unreachable_internal("unexpected access enumerator"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1304)
;
1305}
1306
1307llvm::DIType *CGDebugInfo::createBitFieldType(const FieldDecl *BitFieldDecl,
1308 llvm::DIScope *RecordTy,
1309 const RecordDecl *RD) {
1310 StringRef Name = BitFieldDecl->getName();
1311 QualType Ty = BitFieldDecl->getType();
1312 SourceLocation Loc = BitFieldDecl->getLocation();
1313 llvm::DIFile *VUnit = getOrCreateFile(Loc);
1314 llvm::DIType *DebugType = getOrCreateType(Ty, VUnit);
1315
1316 // Get the location for the field.
1317 llvm::DIFile *File = getOrCreateFile(Loc);
1318 unsigned Line = getLineNumber(Loc);
1319
1320 const CGBitFieldInfo &BitFieldInfo =
1321 CGM.getTypes().getCGRecordLayout(RD).getBitFieldInfo(BitFieldDecl);
1322 uint64_t SizeInBits = BitFieldInfo.Size;
1323 assert(SizeInBits > 0 && "found named 0-width bitfield")((SizeInBits > 0 && "found named 0-width bitfield"
) ? static_cast<void> (0) : __assert_fail ("SizeInBits > 0 && \"found named 0-width bitfield\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1323, __PRETTY_FUNCTION__))
;
1324 uint64_t StorageOffsetInBits =
1325 CGM.getContext().toBits(BitFieldInfo.StorageOffset);
1326 uint64_t Offset = BitFieldInfo.Offset;
1327 // The bit offsets for big endian machines are reversed for big
1328 // endian target, compensate for that as the DIDerivedType requires
1329 // un-reversed offsets.
1330 if (CGM.getDataLayout().isBigEndian())
1331 Offset = BitFieldInfo.StorageSize - BitFieldInfo.Size - Offset;
1332 uint64_t OffsetInBits = StorageOffsetInBits + Offset;
1333 llvm::DINode::DIFlags Flags = getAccessFlag(BitFieldDecl->getAccess(), RD);
1334 return DBuilder.createBitFieldMemberType(
1335 RecordTy, Name, File, Line, SizeInBits, OffsetInBits, StorageOffsetInBits,
1336 Flags, DebugType);
1337}
1338
1339llvm::DIType *
1340CGDebugInfo::createFieldType(StringRef name, QualType type, SourceLocation loc,
1341 AccessSpecifier AS, uint64_t offsetInBits,
1342 uint32_t AlignInBits, llvm::DIFile *tunit,
1343 llvm::DIScope *scope, const RecordDecl *RD) {
1344 llvm::DIType *debugType = getOrCreateType(type, tunit);
1345
1346 // Get the location for the field.
1347 llvm::DIFile *file = getOrCreateFile(loc);
1348 unsigned line = getLineNumber(loc);
1349
1350 uint64_t SizeInBits = 0;
1351 auto Align = AlignInBits;
1352 if (!type->isIncompleteArrayType()) {
1353 TypeInfo TI = CGM.getContext().getTypeInfo(type);
1354 SizeInBits = TI.Width;
1355 if (!Align)
1356 Align = getTypeAlignIfRequired(type, CGM.getContext());
1357 }
1358
1359 llvm::DINode::DIFlags flags = getAccessFlag(AS, RD);
1360 return DBuilder.createMemberType(scope, name, file, line, SizeInBits, Align,
1361 offsetInBits, flags, debugType);
1362}
1363
1364void CGDebugInfo::CollectRecordLambdaFields(
1365 const CXXRecordDecl *CXXDecl, SmallVectorImpl<llvm::Metadata *> &elements,
1366 llvm::DIType *RecordTy) {
1367 // For C++11 Lambdas a Field will be the same as a Capture, but the Capture
1368 // has the name and the location of the variable so we should iterate over
1369 // both concurrently.
1370 const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(CXXDecl);
1371 RecordDecl::field_iterator Field = CXXDecl->field_begin();
1372 unsigned fieldno = 0;
1373 for (CXXRecordDecl::capture_const_iterator I = CXXDecl->captures_begin(),
1374 E = CXXDecl->captures_end();
1375 I != E; ++I, ++Field, ++fieldno) {
1376 const LambdaCapture &C = *I;
1377 if (C.capturesVariable()) {
1378 SourceLocation Loc = C.getLocation();
1379 assert(!Field->isBitField() && "lambdas don't have bitfield members!")((!Field->isBitField() && "lambdas don't have bitfield members!"
) ? static_cast<void> (0) : __assert_fail ("!Field->isBitField() && \"lambdas don't have bitfield members!\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1379, __PRETTY_FUNCTION__))
;
1380 VarDecl *V = C.getCapturedVar();
1381 StringRef VName = V->getName();
1382 llvm::DIFile *VUnit = getOrCreateFile(Loc);
1383 auto Align = getDeclAlignIfRequired(V, CGM.getContext());
1384 llvm::DIType *FieldType = createFieldType(
1385 VName, Field->getType(), Loc, Field->getAccess(),
1386 layout.getFieldOffset(fieldno), Align, VUnit, RecordTy, CXXDecl);
1387 elements.push_back(FieldType);
1388 } else if (C.capturesThis()) {
1389 // TODO: Need to handle 'this' in some way by probably renaming the
1390 // this of the lambda class and having a field member of 'this' or
1391 // by using AT_object_pointer for the function and having that be
1392 // used as 'this' for semantic references.
1393 FieldDecl *f = *Field;
1394 llvm::DIFile *VUnit = getOrCreateFile(f->getLocation());
1395 QualType type = f->getType();
1396 llvm::DIType *fieldType = createFieldType(
1397 "this", type, f->getLocation(), f->getAccess(),
1398 layout.getFieldOffset(fieldno), VUnit, RecordTy, CXXDecl);
1399
1400 elements.push_back(fieldType);
1401 }
1402 }
1403}
1404
1405llvm::DIDerivedType *
1406CGDebugInfo::CreateRecordStaticField(const VarDecl *Var, llvm::DIType *RecordTy,
1407 const RecordDecl *RD) {
1408 // Create the descriptor for the static variable, with or without
1409 // constant initializers.
1410 Var = Var->getCanonicalDecl();
1411 llvm::DIFile *VUnit = getOrCreateFile(Var->getLocation());
1412 llvm::DIType *VTy = getOrCreateType(Var->getType(), VUnit);
1413
1414 unsigned LineNumber = getLineNumber(Var->getLocation());
1415 StringRef VName = Var->getName();
1416 llvm::Constant *C = nullptr;
1417 if (Var->getInit()) {
1418 const APValue *Value = Var->evaluateValue();
1419 if (Value) {
1420 if (Value->isInt())
1421 C = llvm::ConstantInt::get(CGM.getLLVMContext(), Value->getInt());
1422 if (Value->isFloat())
1423 C = llvm::ConstantFP::get(CGM.getLLVMContext(), Value->getFloat());
1424 }
1425 }
1426
1427 llvm::DINode::DIFlags Flags = getAccessFlag(Var->getAccess(), RD);
1428 auto Align = getDeclAlignIfRequired(Var, CGM.getContext());
1429 llvm::DIDerivedType *GV = DBuilder.createStaticMemberType(
1430 RecordTy, VName, VUnit, LineNumber, VTy, Flags, C, Align);
1431 StaticDataMemberCache[Var->getCanonicalDecl()].reset(GV);
1432 return GV;
1433}
1434
1435void CGDebugInfo::CollectRecordNormalField(
1436 const FieldDecl *field, uint64_t OffsetInBits, llvm::DIFile *tunit,
1437 SmallVectorImpl<llvm::Metadata *> &elements, llvm::DIType *RecordTy,
1438 const RecordDecl *RD) {
1439 StringRef name = field->getName();
1440 QualType type = field->getType();
1441
1442 // Ignore unnamed fields unless they're anonymous structs/unions.
1443 if (name.empty() && !type->isRecordType())
1444 return;
1445
1446 llvm::DIType *FieldType;
1447 if (field->isBitField()) {
1448 FieldType = createBitFieldType(field, RecordTy, RD);
1449 } else {
1450 auto Align = getDeclAlignIfRequired(field, CGM.getContext());
1451 FieldType =
1452 createFieldType(name, type, field->getLocation(), field->getAccess(),
1453 OffsetInBits, Align, tunit, RecordTy, RD);
1454 }
1455
1456 elements.push_back(FieldType);
1457}
1458
1459void CGDebugInfo::CollectRecordNestedType(
1460 const TypeDecl *TD, SmallVectorImpl<llvm::Metadata *> &elements) {
1461 QualType Ty = CGM.getContext().getTypeDeclType(TD);
1462 // Injected class names are not considered nested records.
1463 if (isa<InjectedClassNameType>(Ty))
1464 return;
1465 SourceLocation Loc = TD->getLocation();
1466 llvm::DIType *nestedType = getOrCreateType(Ty, getOrCreateFile(Loc));
1467 elements.push_back(nestedType);
1468}
1469
1470void CGDebugInfo::CollectRecordFields(
1471 const RecordDecl *record, llvm::DIFile *tunit,
1472 SmallVectorImpl<llvm::Metadata *> &elements,
1473 llvm::DICompositeType *RecordTy) {
1474 const auto *CXXDecl = dyn_cast<CXXRecordDecl>(record);
1475
1476 if (CXXDecl && CXXDecl->isLambda())
1477 CollectRecordLambdaFields(CXXDecl, elements, RecordTy);
1478 else {
1479 const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(record);
1480
1481 // Field number for non-static fields.
1482 unsigned fieldNo = 0;
1483
1484 // Static and non-static members should appear in the same order as
1485 // the corresponding declarations in the source program.
1486 for (const auto *I : record->decls())
1487 if (const auto *V = dyn_cast<VarDecl>(I)) {
1488 if (V->hasAttr<NoDebugAttr>())
1489 continue;
1490
1491 // Skip variable template specializations when emitting CodeView. MSVC
1492 // doesn't emit them.
1493 if (CGM.getCodeGenOpts().EmitCodeView &&
1494 isa<VarTemplateSpecializationDecl>(V))
1495 continue;
1496
1497 if (isa<VarTemplatePartialSpecializationDecl>(V))
1498 continue;
1499
1500 // Reuse the existing static member declaration if one exists
1501 auto MI = StaticDataMemberCache.find(V->getCanonicalDecl());
1502 if (MI != StaticDataMemberCache.end()) {
1503 assert(MI->second &&((MI->second && "Static data member declaration should still exist"
) ? static_cast<void> (0) : __assert_fail ("MI->second && \"Static data member declaration should still exist\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1504, __PRETTY_FUNCTION__))
1504 "Static data member declaration should still exist")((MI->second && "Static data member declaration should still exist"
) ? static_cast<void> (0) : __assert_fail ("MI->second && \"Static data member declaration should still exist\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1504, __PRETTY_FUNCTION__))
;
1505 elements.push_back(MI->second);
1506 } else {
1507 auto Field = CreateRecordStaticField(V, RecordTy, record);
1508 elements.push_back(Field);
1509 }
1510 } else if (const auto *field = dyn_cast<FieldDecl>(I)) {
1511 CollectRecordNormalField(field, layout.getFieldOffset(fieldNo), tunit,
1512 elements, RecordTy, record);
1513
1514 // Bump field number for next field.
1515 ++fieldNo;
1516 } else if (CGM.getCodeGenOpts().EmitCodeView) {
1517 // Debug info for nested types is included in the member list only for
1518 // CodeView.
1519 if (const auto *nestedType = dyn_cast<TypeDecl>(I))
1520 if (!nestedType->isImplicit() &&
1521 nestedType->getDeclContext() == record)
1522 CollectRecordNestedType(nestedType, elements);
1523 }
1524 }
1525}
1526
1527llvm::DISubroutineType *
1528CGDebugInfo::getOrCreateMethodType(const CXXMethodDecl *Method,
1529 llvm::DIFile *Unit, bool decl) {
1530 const FunctionProtoType *Func = Method->getType()->getAs<FunctionProtoType>();
1531 if (Method->isStatic())
1532 return cast_or_null<llvm::DISubroutineType>(
1533 getOrCreateType(QualType(Func, 0), Unit));
1534 return getOrCreateInstanceMethodType(Method->getThisType(), Func, Unit, decl);
1535}
1536
1537llvm::DISubroutineType *
1538CGDebugInfo::getOrCreateInstanceMethodType(QualType ThisPtr,
1539 const FunctionProtoType *Func,
1540 llvm::DIFile *Unit, bool decl) {
1541 // Add "this" pointer.
1542 llvm::DITypeRefArray Args(
1543 cast<llvm::DISubroutineType>(getOrCreateType(QualType(Func, 0), Unit))
22
The object is a 'DISubroutineType'
1544 ->getTypeArray());
1545 assert(Args.size() && "Invalid number of arguments!")((Args.size() && "Invalid number of arguments!") ? static_cast
<void> (0) : __assert_fail ("Args.size() && \"Invalid number of arguments!\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1545, __PRETTY_FUNCTION__))
;
23
Assuming the condition is true
24
'?' condition is true
1546
1547 SmallVector<llvm::Metadata *, 16> Elts;
1548 // First element is always return type. For 'void' functions it is NULL.
1549 QualType temp = Func->getReturnType();
25
Called C++ object pointer is null
1550 if (temp->getTypeClass() == Type::Auto && decl)
1551 Elts.push_back(CreateType(cast<AutoType>(temp)));
1552 else
1553 Elts.push_back(Args[0]);
1554
1555 // "this" pointer is always first argument.
1556 const CXXRecordDecl *RD = ThisPtr->getPointeeCXXRecordDecl();
1557 if (isa<ClassTemplateSpecializationDecl>(RD)) {
1558 // Create pointer type directly in this case.
1559 const PointerType *ThisPtrTy = cast<PointerType>(ThisPtr);
1560 QualType PointeeTy = ThisPtrTy->getPointeeType();
1561 unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
1562 uint64_t Size = CGM.getTarget().getPointerWidth(AS);
1563 auto Align = getTypeAlignIfRequired(ThisPtrTy, CGM.getContext());
1564 llvm::DIType *PointeeType = getOrCreateType(PointeeTy, Unit);
1565 llvm::DIType *ThisPtrType =
1566 DBuilder.createPointerType(PointeeType, Size, Align);
1567 TypeCache[ThisPtr.getAsOpaquePtr()].reset(ThisPtrType);
1568 // TODO: This and the artificial type below are misleading, the
1569 // types aren't artificial the argument is, but the current
1570 // metadata doesn't represent that.
1571 ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
1572 Elts.push_back(ThisPtrType);
1573 } else {
1574 llvm::DIType *ThisPtrType = getOrCreateType(ThisPtr, Unit);
1575 TypeCache[ThisPtr.getAsOpaquePtr()].reset(ThisPtrType);
1576 ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
1577 Elts.push_back(ThisPtrType);
1578 }
1579
1580 // Copy rest of the arguments.
1581 for (unsigned i = 1, e = Args.size(); i != e; ++i)
1582 Elts.push_back(Args[i]);
1583
1584 llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(Elts);
1585
1586 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
1587 if (Func->getExtProtoInfo().RefQualifier == RQ_LValue)
1588 Flags |= llvm::DINode::FlagLValueReference;
1589 if (Func->getExtProtoInfo().RefQualifier == RQ_RValue)
1590 Flags |= llvm::DINode::FlagRValueReference;
1591
1592 return DBuilder.createSubroutineType(EltTypeArray, Flags,
1593 getDwarfCC(Func->getCallConv()));
1594}
1595
1596/// isFunctionLocalClass - Return true if CXXRecordDecl is defined
1597/// inside a function.
1598static bool isFunctionLocalClass(const CXXRecordDecl *RD) {
1599 if (const auto *NRD = dyn_cast<CXXRecordDecl>(RD->getDeclContext()))
1600 return isFunctionLocalClass(NRD);
1601 if (isa<FunctionDecl>(RD->getDeclContext()))
1602 return true;
1603 return false;
1604}
1605
1606llvm::DISubprogram *CGDebugInfo::CreateCXXMemberFunction(
1607 const CXXMethodDecl *Method, llvm::DIFile *Unit, llvm::DIType *RecordTy) {
1608 bool IsCtorOrDtor =
1609 isa<CXXConstructorDecl>(Method) || isa<CXXDestructorDecl>(Method);
1610
1611 StringRef MethodName = getFunctionName(Method);
1612 llvm::DISubroutineType *MethodTy = getOrCreateMethodType(Method, Unit, true);
1613
1614 // Since a single ctor/dtor corresponds to multiple functions, it doesn't
1615 // make sense to give a single ctor/dtor a linkage name.
1616 StringRef MethodLinkageName;
1617 // FIXME: 'isFunctionLocalClass' seems like an arbitrary/unintentional
1618 // property to use here. It may've been intended to model "is non-external
1619 // type" but misses cases of non-function-local but non-external classes such
1620 // as those in anonymous namespaces as well as the reverse - external types
1621 // that are function local, such as those in (non-local) inline functions.
1622 if (!IsCtorOrDtor && !isFunctionLocalClass(Method->getParent()))
1623 MethodLinkageName = CGM.getMangledName(Method);
1624
1625 // Get the location for the method.
1626 llvm::DIFile *MethodDefUnit = nullptr;
1627 unsigned MethodLine = 0;
1628 if (!Method->isImplicit()) {
1629 MethodDefUnit = getOrCreateFile(Method->getLocation());
1630 MethodLine = getLineNumber(Method->getLocation());
1631 }
1632
1633 // Collect virtual method info.
1634 llvm::DIType *ContainingType = nullptr;
1635 unsigned VIndex = 0;
1636 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
1637 llvm::DISubprogram::DISPFlags SPFlags = llvm::DISubprogram::SPFlagZero;
1638 int ThisAdjustment = 0;
1639
1640 if (Method->isVirtual()) {
1641 if (Method->isPure())
1642 SPFlags |= llvm::DISubprogram::SPFlagPureVirtual;
1643 else
1644 SPFlags |= llvm::DISubprogram::SPFlagVirtual;
1645
1646 if (CGM.getTarget().getCXXABI().isItaniumFamily()) {
1647 // It doesn't make sense to give a virtual destructor a vtable index,
1648 // since a single destructor has two entries in the vtable.
1649 if (!isa<CXXDestructorDecl>(Method))
1650 VIndex = CGM.getItaniumVTableContext().getMethodVTableIndex(Method);
1651 } else {
1652 // Emit MS ABI vftable information. There is only one entry for the
1653 // deleting dtor.
1654 const auto *DD = dyn_cast<CXXDestructorDecl>(Method);
1655 GlobalDecl GD = DD ? GlobalDecl(DD, Dtor_Deleting) : GlobalDecl(Method);
1656 MethodVFTableLocation ML =
1657 CGM.getMicrosoftVTableContext().getMethodVFTableLocation(GD);
1658 VIndex = ML.Index;
1659
1660 // CodeView only records the vftable offset in the class that introduces
1661 // the virtual method. This is possible because, unlike Itanium, the MS
1662 // C++ ABI does not include all virtual methods from non-primary bases in
1663 // the vtable for the most derived class. For example, if C inherits from
1664 // A and B, C's primary vftable will not include B's virtual methods.
1665 if (Method->size_overridden_methods() == 0)
1666 Flags |= llvm::DINode::FlagIntroducedVirtual;
1667
1668 // The 'this' adjustment accounts for both the virtual and non-virtual
1669 // portions of the adjustment. Presumably the debugger only uses it when
1670 // it knows the dynamic type of an object.
1671 ThisAdjustment = CGM.getCXXABI()
1672 .getVirtualFunctionPrologueThisAdjustment(GD)
1673 .getQuantity();
1674 }
1675 ContainingType = RecordTy;
1676 }
1677
1678 // We're checking for deleted C++ special member functions
1679 // [Ctors,Dtors, Copy/Move]
1680 auto checkAttrDeleted = [&](const auto *Method) {
1681 if (Method->getCanonicalDecl()->isDeleted())
1682 SPFlags |= llvm::DISubprogram::SPFlagDeleted;
1683 };
1684
1685 switch (Method->getKind()) {
1686
1687 case Decl::CXXConstructor:
1688 case Decl::CXXDestructor:
1689 checkAttrDeleted(Method);
1690 break;
1691 case Decl::CXXMethod:
1692 if (Method->isCopyAssignmentOperator() ||
1693 Method->isMoveAssignmentOperator())
1694 checkAttrDeleted(Method);
1695 break;
1696 default:
1697 break;
1698 }
1699
1700 if (Method->isNoReturn())
1701 Flags |= llvm::DINode::FlagNoReturn;
1702
1703 if (Method->isStatic())
1704 Flags |= llvm::DINode::FlagStaticMember;
1705 if (Method->isImplicit())
1706 Flags |= llvm::DINode::FlagArtificial;
1707 Flags |= getAccessFlag(Method->getAccess(), Method->getParent());
1708 if (const auto *CXXC = dyn_cast<CXXConstructorDecl>(Method)) {
1709 if (CXXC->isExplicit())
1710 Flags |= llvm::DINode::FlagExplicit;
1711 } else if (const auto *CXXC = dyn_cast<CXXConversionDecl>(Method)) {
1712 if (CXXC->isExplicit())
1713 Flags |= llvm::DINode::FlagExplicit;
1714 }
1715 if (Method->hasPrototype())
1716 Flags |= llvm::DINode::FlagPrototyped;
1717 if (Method->getRefQualifier() == RQ_LValue)
1718 Flags |= llvm::DINode::FlagLValueReference;
1719 if (Method->getRefQualifier() == RQ_RValue)
1720 Flags |= llvm::DINode::FlagRValueReference;
1721 if (CGM.getLangOpts().Optimize)
1722 SPFlags |= llvm::DISubprogram::SPFlagOptimized;
1723
1724 // In this debug mode, emit type info for a class when its constructor type
1725 // info is emitted.
1726 if (DebugKind == codegenoptions::DebugInfoConstructor)
1727 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(Method))
1728 completeUnusedClass(*CD->getParent());
1729
1730 llvm::DINodeArray TParamsArray = CollectFunctionTemplateParams(Method, Unit);
1731 llvm::DISubprogram *SP = DBuilder.createMethod(
1732 RecordTy, MethodName, MethodLinkageName, MethodDefUnit, MethodLine,
1733 MethodTy, VIndex, ThisAdjustment, ContainingType, Flags, SPFlags,
1734 TParamsArray.get());
1735
1736 SPCache[Method->getCanonicalDecl()].reset(SP);
1737
1738 return SP;
1739}
1740
1741void CGDebugInfo::CollectCXXMemberFunctions(
1742 const CXXRecordDecl *RD, llvm::DIFile *Unit,
1743 SmallVectorImpl<llvm::Metadata *> &EltTys, llvm::DIType *RecordTy) {
1744
1745 // Since we want more than just the individual member decls if we
1746 // have templated functions iterate over every declaration to gather
1747 // the functions.
1748 for (const auto *I : RD->decls()) {
1749 const auto *Method = dyn_cast<CXXMethodDecl>(I);
1750 // If the member is implicit, don't add it to the member list. This avoids
1751 // the member being added to type units by LLVM, while still allowing it
1752 // to be emitted into the type declaration/reference inside the compile
1753 // unit.
1754 // Ditto 'nodebug' methods, for consistency with CodeGenFunction.cpp.
1755 // FIXME: Handle Using(Shadow?)Decls here to create
1756 // DW_TAG_imported_declarations inside the class for base decls brought into
1757 // derived classes. GDB doesn't seem to notice/leverage these when I tried
1758 // it, so I'm not rushing to fix this. (GCC seems to produce them, if
1759 // referenced)
1760 if (!Method || Method->isImplicit() || Method->hasAttr<NoDebugAttr>())
1761 continue;
1762
1763 if (Method->getType()->castAs<FunctionProtoType>()->getContainedAutoType())
1764 continue;
1765
1766 // Reuse the existing member function declaration if it exists.
1767 // It may be associated with the declaration of the type & should be
1768 // reused as we're building the definition.
1769 //
1770 // This situation can arise in the vtable-based debug info reduction where
1771 // implicit members are emitted in a non-vtable TU.
1772 auto MI = SPCache.find(Method->getCanonicalDecl());
1773 EltTys.push_back(MI == SPCache.end()
1774 ? CreateCXXMemberFunction(Method, Unit, RecordTy)
1775 : static_cast<llvm::Metadata *>(MI->second));
1776 }
1777}
1778
1779void CGDebugInfo::CollectCXXBases(const CXXRecordDecl *RD, llvm::DIFile *Unit,
1780 SmallVectorImpl<llvm::Metadata *> &EltTys,
1781 llvm::DIType *RecordTy) {
1782 llvm::DenseSet<CanonicalDeclPtr<const CXXRecordDecl>> SeenTypes;
1783 CollectCXXBasesAux(RD, Unit, EltTys, RecordTy, RD->bases(), SeenTypes,
1784 llvm::DINode::FlagZero);
1785
1786 // If we are generating CodeView debug info, we also need to emit records for
1787 // indirect virtual base classes.
1788 if (CGM.getCodeGenOpts().EmitCodeView) {
1789 CollectCXXBasesAux(RD, Unit, EltTys, RecordTy, RD->vbases(), SeenTypes,
1790 llvm::DINode::FlagIndirectVirtualBase);
1791 }
1792}
1793
1794void CGDebugInfo::CollectCXXBasesAux(
1795 const CXXRecordDecl *RD, llvm::DIFile *Unit,
1796 SmallVectorImpl<llvm::Metadata *> &EltTys, llvm::DIType *RecordTy,
1797 const CXXRecordDecl::base_class_const_range &Bases,
1798 llvm::DenseSet<CanonicalDeclPtr<const CXXRecordDecl>> &SeenTypes,
1799 llvm::DINode::DIFlags StartingFlags) {
1800 const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
1801 for (const auto &BI : Bases) {
1802 const auto *Base =
1803 cast<CXXRecordDecl>(BI.getType()->castAs<RecordType>()->getDecl());
1804 if (!SeenTypes.insert(Base).second)
1805 continue;
1806 auto *BaseTy = getOrCreateType(BI.getType(), Unit);
1807 llvm::DINode::DIFlags BFlags = StartingFlags;
1808 uint64_t BaseOffset;
1809 uint32_t VBPtrOffset = 0;
1810
1811 if (BI.isVirtual()) {
1812 if (CGM.getTarget().getCXXABI().isItaniumFamily()) {
1813 // virtual base offset offset is -ve. The code generator emits dwarf
1814 // expression where it expects +ve number.
1815 BaseOffset = 0 - CGM.getItaniumVTableContext()
1816 .getVirtualBaseOffsetOffset(RD, Base)
1817 .getQuantity();
1818 } else {
1819 // In the MS ABI, store the vbtable offset, which is analogous to the
1820 // vbase offset offset in Itanium.
1821 BaseOffset =
1822 4 * CGM.getMicrosoftVTableContext().getVBTableIndex(RD, Base);
1823 VBPtrOffset = CGM.getContext()
1824 .getASTRecordLayout(RD)
1825 .getVBPtrOffset()
1826 .getQuantity();
1827 }
1828 BFlags |= llvm::DINode::FlagVirtual;
1829 } else
1830 BaseOffset = CGM.getContext().toBits(RL.getBaseClassOffset(Base));
1831 // FIXME: Inconsistent units for BaseOffset. It is in bytes when
1832 // BI->isVirtual() and bits when not.
1833
1834 BFlags |= getAccessFlag(BI.getAccessSpecifier(), RD);
1835 llvm::DIType *DTy = DBuilder.createInheritance(RecordTy, BaseTy, BaseOffset,
1836 VBPtrOffset, BFlags);
1837 EltTys.push_back(DTy);
1838 }
1839}
1840
1841llvm::DINodeArray
1842CGDebugInfo::CollectTemplateParams(const TemplateParameterList *TPList,
1843 ArrayRef<TemplateArgument> TAList,
1844 llvm::DIFile *Unit) {
1845 SmallVector<llvm::Metadata *, 16> TemplateParams;
1846 for (unsigned i = 0, e = TAList.size(); i != e; ++i) {
1847 const TemplateArgument &TA = TAList[i];
1848 StringRef Name;
1849 bool defaultParameter = false;
1850 if (TPList)
1851 Name = TPList->getParam(i)->getName();
1852 switch (TA.getKind()) {
1853 case TemplateArgument::Type: {
1854 llvm::DIType *TTy = getOrCreateType(TA.getAsType(), Unit);
1855
1856 if (TPList)
1857 if (auto *templateType =
1858 dyn_cast_or_null<TemplateTypeParmDecl>(TPList->getParam(i)))
1859 if (templateType->hasDefaultArgument())
1860 defaultParameter =
1861 templateType->getDefaultArgument() == TA.getAsType();
1862
1863 TemplateParams.push_back(DBuilder.createTemplateTypeParameter(
1864 TheCU, Name, TTy, defaultParameter));
1865
1866 } break;
1867 case TemplateArgument::Integral: {
1868 llvm::DIType *TTy = getOrCreateType(TA.getIntegralType(), Unit);
1869 if (TPList && CGM.getCodeGenOpts().DwarfVersion >= 5)
1870 if (auto *templateType =
1871 dyn_cast_or_null<NonTypeTemplateParmDecl>(TPList->getParam(i)))
1872 if (templateType->hasDefaultArgument() &&
1873 !templateType->getDefaultArgument()->isValueDependent())
1874 defaultParameter = llvm::APSInt::isSameValue(
1875 templateType->getDefaultArgument()->EvaluateKnownConstInt(
1876 CGM.getContext()),
1877 TA.getAsIntegral());
1878
1879 TemplateParams.push_back(DBuilder.createTemplateValueParameter(
1880 TheCU, Name, TTy, defaultParameter,
1881 llvm::ConstantInt::get(CGM.getLLVMContext(), TA.getAsIntegral())));
1882 } break;
1883 case TemplateArgument::Declaration: {
1884 const ValueDecl *D = TA.getAsDecl();
1885 QualType T = TA.getParamTypeForDecl().getDesugaredType(CGM.getContext());
1886 llvm::DIType *TTy = getOrCreateType(T, Unit);
1887 llvm::Constant *V = nullptr;
1888 // Skip retrieve the value if that template parameter has cuda device
1889 // attribute, i.e. that value is not available at the host side.
1890 if (!CGM.getLangOpts().CUDA || CGM.getLangOpts().CUDAIsDevice ||
1891 !D->hasAttr<CUDADeviceAttr>()) {
1892 const CXXMethodDecl *MD;
1893 // Variable pointer template parameters have a value that is the address
1894 // of the variable.
1895 if (const auto *VD = dyn_cast<VarDecl>(D))
1896 V = CGM.GetAddrOfGlobalVar(VD);
1897 // Member function pointers have special support for building them,
1898 // though this is currently unsupported in LLVM CodeGen.
1899 else if ((MD = dyn_cast<CXXMethodDecl>(D)) && MD->isInstance())
1900 V = CGM.getCXXABI().EmitMemberFunctionPointer(MD);
1901 else if (const auto *FD = dyn_cast<FunctionDecl>(D))
1902 V = CGM.GetAddrOfFunction(FD);
1903 // Member data pointers have special handling too to compute the fixed
1904 // offset within the object.
1905 else if (const auto *MPT =
1906 dyn_cast<MemberPointerType>(T.getTypePtr())) {
1907 // These five lines (& possibly the above member function pointer
1908 // handling) might be able to be refactored to use similar code in
1909 // CodeGenModule::getMemberPointerConstant
1910 uint64_t fieldOffset = CGM.getContext().getFieldOffset(D);
1911 CharUnits chars =
1912 CGM.getContext().toCharUnitsFromBits((int64_t)fieldOffset);
1913 V = CGM.getCXXABI().EmitMemberDataPointer(MPT, chars);
1914 } else if (const auto *GD = dyn_cast<MSGuidDecl>(D)) {
1915 V = CGM.GetAddrOfMSGuidDecl(GD).getPointer();
1916 }
1917 assert(V && "Failed to find template parameter pointer")((V && "Failed to find template parameter pointer") ?
static_cast<void> (0) : __assert_fail ("V && \"Failed to find template parameter pointer\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1917, __PRETTY_FUNCTION__))
;
1918 V = V->stripPointerCasts();
1919 }
1920 TemplateParams.push_back(DBuilder.createTemplateValueParameter(
1921 TheCU, Name, TTy, defaultParameter, cast_or_null<llvm::Constant>(V)));
1922 } break;
1923 case TemplateArgument::NullPtr: {
1924 QualType T = TA.getNullPtrType();
1925 llvm::DIType *TTy = getOrCreateType(T, Unit);
1926 llvm::Constant *V = nullptr;
1927 // Special case member data pointer null values since they're actually -1
1928 // instead of zero.
1929 if (const auto *MPT = dyn_cast<MemberPointerType>(T.getTypePtr()))
1930 // But treat member function pointers as simple zero integers because
1931 // it's easier than having a special case in LLVM's CodeGen. If LLVM
1932 // CodeGen grows handling for values of non-null member function
1933 // pointers then perhaps we could remove this special case and rely on
1934 // EmitNullMemberPointer for member function pointers.
1935 if (MPT->isMemberDataPointer())
1936 V = CGM.getCXXABI().EmitNullMemberPointer(MPT);
1937 if (!V)
1938 V = llvm::ConstantInt::get(CGM.Int8Ty, 0);
1939 TemplateParams.push_back(DBuilder.createTemplateValueParameter(
1940 TheCU, Name, TTy, defaultParameter, V));
1941 } break;
1942 case TemplateArgument::Template:
1943 TemplateParams.push_back(DBuilder.createTemplateTemplateParameter(
1944 TheCU, Name, nullptr,
1945 TA.getAsTemplate().getAsTemplateDecl()->getQualifiedNameAsString()));
1946 break;
1947 case TemplateArgument::Pack:
1948 TemplateParams.push_back(DBuilder.createTemplateParameterPack(
1949 TheCU, Name, nullptr,
1950 CollectTemplateParams(nullptr, TA.getPackAsArray(), Unit)));
1951 break;
1952 case TemplateArgument::Expression: {
1953 const Expr *E = TA.getAsExpr();
1954 QualType T = E->getType();
1955 if (E->isGLValue())
1956 T = CGM.getContext().getLValueReferenceType(T);
1957 llvm::Constant *V = ConstantEmitter(CGM).emitAbstract(E, T);
1958 assert(V && "Expression in template argument isn't constant")((V && "Expression in template argument isn't constant"
) ? static_cast<void> (0) : __assert_fail ("V && \"Expression in template argument isn't constant\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1958, __PRETTY_FUNCTION__))
;
1959 llvm::DIType *TTy = getOrCreateType(T, Unit);
1960 TemplateParams.push_back(DBuilder.createTemplateValueParameter(
1961 TheCU, Name, TTy, defaultParameter, V->stripPointerCasts()));
1962 } break;
1963 // And the following should never occur:
1964 case TemplateArgument::TemplateExpansion:
1965 case TemplateArgument::Null:
1966 llvm_unreachable(::llvm::llvm_unreachable_internal("These argument types shouldn't exist in concrete types"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1967)
1967 "These argument types shouldn't exist in concrete types")::llvm::llvm_unreachable_internal("These argument types shouldn't exist in concrete types"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 1967)
;
1968 }
1969 }
1970 return DBuilder.getOrCreateArray(TemplateParams);
1971}
1972
1973llvm::DINodeArray
1974CGDebugInfo::CollectFunctionTemplateParams(const FunctionDecl *FD,
1975 llvm::DIFile *Unit) {
1976 if (FD->getTemplatedKind() ==
1977 FunctionDecl::TK_FunctionTemplateSpecialization) {
1978 const TemplateParameterList *TList = FD->getTemplateSpecializationInfo()
1979 ->getTemplate()
1980 ->getTemplateParameters();
1981 return CollectTemplateParams(
1982 TList, FD->getTemplateSpecializationArgs()->asArray(), Unit);
1983 }
1984 return llvm::DINodeArray();
1985}
1986
1987llvm::DINodeArray CGDebugInfo::CollectVarTemplateParams(const VarDecl *VL,
1988 llvm::DIFile *Unit) {
1989 // Always get the full list of parameters, not just the ones from the
1990 // specialization. A partial specialization may have fewer parameters than
1991 // there are arguments.
1992 auto *TS = dyn_cast<VarTemplateSpecializationDecl>(VL);
1993 if (!TS)
1994 return llvm::DINodeArray();
1995 VarTemplateDecl *T = TS->getSpecializedTemplate();
1996 const TemplateParameterList *TList = T->getTemplateParameters();
1997 auto TA = TS->getTemplateArgs().asArray();
1998 return CollectTemplateParams(TList, TA, Unit);
1999}
2000
2001llvm::DINodeArray CGDebugInfo::CollectCXXTemplateParams(
2002 const ClassTemplateSpecializationDecl *TSpecial, llvm::DIFile *Unit) {
2003 // Always get the full list of parameters, not just the ones from the
2004 // specialization. A partial specialization may have fewer parameters than
2005 // there are arguments.
2006 TemplateParameterList *TPList =
2007 TSpecial->getSpecializedTemplate()->getTemplateParameters();
2008 const TemplateArgumentList &TAList = TSpecial->getTemplateArgs();
2009 return CollectTemplateParams(TPList, TAList.asArray(), Unit);
2010}
2011
2012llvm::DIType *CGDebugInfo::getOrCreateVTablePtrType(llvm::DIFile *Unit) {
2013 if (VTablePtrType)
2014 return VTablePtrType;
2015
2016 ASTContext &Context = CGM.getContext();
2017
2018 /* Function type */
2019 llvm::Metadata *STy = getOrCreateType(Context.IntTy, Unit);
2020 llvm::DITypeRefArray SElements = DBuilder.getOrCreateTypeArray(STy);
2021 llvm::DIType *SubTy = DBuilder.createSubroutineType(SElements);
2022 unsigned Size = Context.getTypeSize(Context.VoidPtrTy);
2023 unsigned VtblPtrAddressSpace = CGM.getTarget().getVtblPtrAddressSpace();
2024 Optional<unsigned> DWARFAddressSpace =
2025 CGM.getTarget().getDWARFAddressSpace(VtblPtrAddressSpace);
2026
2027 llvm::DIType *vtbl_ptr_type = DBuilder.createPointerType(
2028 SubTy, Size, 0, DWARFAddressSpace, "__vtbl_ptr_type");
2029 VTablePtrType = DBuilder.createPointerType(vtbl_ptr_type, Size);
2030 return VTablePtrType;
2031}
2032
2033StringRef CGDebugInfo::getVTableName(const CXXRecordDecl *RD) {
2034 // Copy the gdb compatible name on the side and use its reference.
2035 return internString("_vptr$", RD->getNameAsString());
2036}
2037
2038StringRef CGDebugInfo::getDynamicInitializerName(const VarDecl *VD,
2039 DynamicInitKind StubKind,
2040 llvm::Function *InitFn) {
2041 // If we're not emitting codeview, use the mangled name. For Itanium, this is
2042 // arbitrary.
2043 if (!CGM.getCodeGenOpts().EmitCodeView ||
2044 StubKind == DynamicInitKind::GlobalArrayDestructor)
2045 return InitFn->getName();
2046
2047 // Print the normal qualified name for the variable, then break off the last
2048 // NNS, and add the appropriate other text. Clang always prints the global
2049 // variable name without template arguments, so we can use rsplit("::") and
2050 // then recombine the pieces.
2051 SmallString<128> QualifiedGV;
2052 StringRef Quals;
2053 StringRef GVName;
2054 {
2055 llvm::raw_svector_ostream OS(QualifiedGV);
2056 VD->printQualifiedName(OS, getPrintingPolicy());
2057 std::tie(Quals, GVName) = OS.str().rsplit("::");
2058 if (GVName.empty())
2059 std::swap(Quals, GVName);
2060 }
2061
2062 SmallString<128> InitName;
2063 llvm::raw_svector_ostream OS(InitName);
2064 if (!Quals.empty())
2065 OS << Quals << "::";
2066
2067 switch (StubKind) {
2068 case DynamicInitKind::NoStub:
2069 case DynamicInitKind::GlobalArrayDestructor:
2070 llvm_unreachable("not an initializer")::llvm::llvm_unreachable_internal("not an initializer", "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2070)
;
2071 case DynamicInitKind::Initializer:
2072 OS << "`dynamic initializer for '";
2073 break;
2074 case DynamicInitKind::AtExit:
2075 OS << "`dynamic atexit destructor for '";
2076 break;
2077 }
2078
2079 OS << GVName;
2080
2081 // Add any template specialization args.
2082 if (const auto *VTpl = dyn_cast<VarTemplateSpecializationDecl>(VD)) {
2083 printTemplateArgumentList(OS, VTpl->getTemplateArgs().asArray(),
2084 getPrintingPolicy());
2085 }
2086
2087 OS << '\'';
2088
2089 return internString(OS.str());
2090}
2091
2092void CGDebugInfo::CollectVTableInfo(const CXXRecordDecl *RD, llvm::DIFile *Unit,
2093 SmallVectorImpl<llvm::Metadata *> &EltTys,
2094 llvm::DICompositeType *RecordTy) {
2095 // If this class is not dynamic then there is not any vtable info to collect.
2096 if (!RD->isDynamicClass())
2097 return;
2098
2099 // Don't emit any vtable shape or vptr info if this class doesn't have an
2100 // extendable vfptr. This can happen if the class doesn't have virtual
2101 // methods, or in the MS ABI if those virtual methods only come from virtually
2102 // inherited bases.
2103 const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
2104 if (!RL.hasExtendableVFPtr())
2105 return;
2106
2107 // CodeView needs to know how large the vtable of every dynamic class is, so
2108 // emit a special named pointer type into the element list. The vptr type
2109 // points to this type as well.
2110 llvm::DIType *VPtrTy = nullptr;
2111 bool NeedVTableShape = CGM.getCodeGenOpts().EmitCodeView &&
2112 CGM.getTarget().getCXXABI().isMicrosoft();
2113 if (NeedVTableShape) {
2114 uint64_t PtrWidth =
2115 CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
2116 const VTableLayout &VFTLayout =
2117 CGM.getMicrosoftVTableContext().getVFTableLayout(RD, CharUnits::Zero());
2118 unsigned VSlotCount =
2119 VFTLayout.vtable_components().size() - CGM.getLangOpts().RTTIData;
2120 unsigned VTableWidth = PtrWidth * VSlotCount;
2121 unsigned VtblPtrAddressSpace = CGM.getTarget().getVtblPtrAddressSpace();
2122 Optional<unsigned> DWARFAddressSpace =
2123 CGM.getTarget().getDWARFAddressSpace(VtblPtrAddressSpace);
2124
2125 // Create a very wide void* type and insert it directly in the element list.
2126 llvm::DIType *VTableType = DBuilder.createPointerType(
2127 nullptr, VTableWidth, 0, DWARFAddressSpace, "__vtbl_ptr_type");
2128 EltTys.push_back(VTableType);
2129
2130 // The vptr is a pointer to this special vtable type.
2131 VPtrTy = DBuilder.createPointerType(VTableType, PtrWidth);
2132 }
2133
2134 // If there is a primary base then the artificial vptr member lives there.
2135 if (RL.getPrimaryBase())
2136 return;
2137
2138 if (!VPtrTy)
2139 VPtrTy = getOrCreateVTablePtrType(Unit);
2140
2141 unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
2142 llvm::DIType *VPtrMember =
2143 DBuilder.createMemberType(Unit, getVTableName(RD), Unit, 0, Size, 0, 0,
2144 llvm::DINode::FlagArtificial, VPtrTy);
2145 EltTys.push_back(VPtrMember);
2146}
2147
2148llvm::DIType *CGDebugInfo::getOrCreateRecordType(QualType RTy,
2149 SourceLocation Loc) {
2150 assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((CGM.getCodeGenOpts().hasReducedDebugInfo()) ? static_cast<
void> (0) : __assert_fail ("CGM.getCodeGenOpts().hasReducedDebugInfo()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2150, __PRETTY_FUNCTION__))
;
2151 llvm::DIType *T = getOrCreateType(RTy, getOrCreateFile(Loc));
2152 return T;
2153}
2154
2155llvm::DIType *CGDebugInfo::getOrCreateInterfaceType(QualType D,
2156 SourceLocation Loc) {
2157 return getOrCreateStandaloneType(D, Loc);
2158}
2159
2160llvm::DIType *CGDebugInfo::getOrCreateStandaloneType(QualType D,
2161 SourceLocation Loc) {
2162 assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((CGM.getCodeGenOpts().hasReducedDebugInfo()) ? static_cast<
void> (0) : __assert_fail ("CGM.getCodeGenOpts().hasReducedDebugInfo()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2162, __PRETTY_FUNCTION__))
;
2163 assert(!D.isNull() && "null type")((!D.isNull() && "null type") ? static_cast<void>
(0) : __assert_fail ("!D.isNull() && \"null type\"",
"/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2163, __PRETTY_FUNCTION__))
;
2164 llvm::DIType *T = getOrCreateType(D, getOrCreateFile(Loc));
2165 assert(T && "could not create debug info for type")((T && "could not create debug info for type") ? static_cast
<void> (0) : __assert_fail ("T && \"could not create debug info for type\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2165, __PRETTY_FUNCTION__))
;
2166
2167 RetainedTypes.push_back(D.getAsOpaquePtr());
2168 return T;
2169}
2170
2171void CGDebugInfo::addHeapAllocSiteMetadata(llvm::CallBase *CI,
2172 QualType AllocatedTy,
2173 SourceLocation Loc) {
2174 if (CGM.getCodeGenOpts().getDebugInfo() <=
2175 codegenoptions::DebugLineTablesOnly)
2176 return;
2177 llvm::MDNode *node;
2178 if (AllocatedTy->isVoidType())
2179 node = llvm::MDNode::get(CGM.getLLVMContext(), None);
2180 else
2181 node = getOrCreateType(AllocatedTy, getOrCreateFile(Loc));
2182
2183 CI->setMetadata("heapallocsite", node);
2184}
2185
2186void CGDebugInfo::completeType(const EnumDecl *ED) {
2187 if (DebugKind <= codegenoptions::DebugLineTablesOnly)
2188 return;
2189 QualType Ty = CGM.getContext().getEnumType(ED);
2190 void *TyPtr = Ty.getAsOpaquePtr();
2191 auto I = TypeCache.find(TyPtr);
2192 if (I == TypeCache.end() || !cast<llvm::DIType>(I->second)->isForwardDecl())
2193 return;
2194 llvm::DIType *Res = CreateTypeDefinition(Ty->castAs<EnumType>());
2195 assert(!Res->isForwardDecl())((!Res->isForwardDecl()) ? static_cast<void> (0) : __assert_fail
("!Res->isForwardDecl()", "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2195, __PRETTY_FUNCTION__))
;
2196 TypeCache[TyPtr].reset(Res);
2197}
2198
2199void CGDebugInfo::completeType(const RecordDecl *RD) {
2200 if (DebugKind > codegenoptions::LimitedDebugInfo ||
2201 !CGM.getLangOpts().CPlusPlus)
2202 completeRequiredType(RD);
2203}
2204
2205/// Return true if the class or any of its methods are marked dllimport.
2206static bool isClassOrMethodDLLImport(const CXXRecordDecl *RD) {
2207 if (RD->hasAttr<DLLImportAttr>())
2208 return true;
2209 for (const CXXMethodDecl *MD : RD->methods())
2210 if (MD->hasAttr<DLLImportAttr>())
2211 return true;
2212 return false;
2213}
2214
2215/// Does a type definition exist in an imported clang module?
2216static bool isDefinedInClangModule(const RecordDecl *RD) {
2217 // Only definitions that where imported from an AST file come from a module.
2218 if (!RD || !RD->isFromASTFile())
2219 return false;
2220 // Anonymous entities cannot be addressed. Treat them as not from module.
2221 if (!RD->isExternallyVisible() && RD->getName().empty())
2222 return false;
2223 if (auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD)) {
2224 if (!CXXDecl->isCompleteDefinition())
2225 return false;
2226 // Check wether RD is a template.
2227 auto TemplateKind = CXXDecl->getTemplateSpecializationKind();
2228 if (TemplateKind != TSK_Undeclared) {
2229 // Unfortunately getOwningModule() isn't accurate enough to find the
2230 // owning module of a ClassTemplateSpecializationDecl that is inside a
2231 // namespace spanning multiple modules.
2232 bool Explicit = false;
2233 if (auto *TD = dyn_cast<ClassTemplateSpecializationDecl>(CXXDecl))
2234 Explicit = TD->isExplicitInstantiationOrSpecialization();
2235 if (!Explicit && CXXDecl->getEnclosingNamespaceContext())
2236 return false;
2237 // This is a template, check the origin of the first member.
2238 if (CXXDecl->field_begin() == CXXDecl->field_end())
2239 return TemplateKind == TSK_ExplicitInstantiationDeclaration;
2240 if (!CXXDecl->field_begin()->isFromASTFile())
2241 return false;
2242 }
2243 }
2244 return true;
2245}
2246
2247void CGDebugInfo::completeClassData(const RecordDecl *RD) {
2248 if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD))
2249 if (CXXRD->isDynamicClass() &&
2250 CGM.getVTableLinkage(CXXRD) ==
2251 llvm::GlobalValue::AvailableExternallyLinkage &&
2252 !isClassOrMethodDLLImport(CXXRD))
2253 return;
2254
2255 if (DebugTypeExtRefs && isDefinedInClangModule(RD->getDefinition()))
2256 return;
2257
2258 completeClass(RD);
2259}
2260
2261void CGDebugInfo::completeClass(const RecordDecl *RD) {
2262 if (DebugKind <= codegenoptions::DebugLineTablesOnly)
2263 return;
2264 QualType Ty = CGM.getContext().getRecordType(RD);
2265 void *TyPtr = Ty.getAsOpaquePtr();
2266 auto I = TypeCache.find(TyPtr);
2267 if (I != TypeCache.end() && !cast<llvm::DIType>(I->second)->isForwardDecl())
2268 return;
2269 llvm::DIType *Res = CreateTypeDefinition(Ty->castAs<RecordType>());
2270 assert(!Res->isForwardDecl())((!Res->isForwardDecl()) ? static_cast<void> (0) : __assert_fail
("!Res->isForwardDecl()", "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2270, __PRETTY_FUNCTION__))
;
2271 TypeCache[TyPtr].reset(Res);
2272}
2273
2274static bool hasExplicitMemberDefinition(CXXRecordDecl::method_iterator I,
2275 CXXRecordDecl::method_iterator End) {
2276 for (CXXMethodDecl *MD : llvm::make_range(I, End))
2277 if (FunctionDecl *Tmpl = MD->getInstantiatedFromMemberFunction())
2278 if (!Tmpl->isImplicit() && Tmpl->isThisDeclarationADefinition() &&
2279 !MD->getMemberSpecializationInfo()->isExplicitSpecialization())
2280 return true;
2281 return false;
2282}
2283
2284static bool canUseCtorHoming(const CXXRecordDecl *RD) {
2285 // Constructor homing can be used for classes that cannnot be constructed
2286 // without emitting code for one of their constructors. This is classes that
2287 // don't have trivial or constexpr constructors, or can be created from
2288 // aggregate initialization. Also skip lambda objects because they don't call
2289 // constructors.
2290
2291 // Skip this optimization if the class or any of its methods are marked
2292 // dllimport.
2293 if (isClassOrMethodDLLImport(RD))
2294 return false;
2295
2296 return !RD->isLambda() && !RD->isAggregate() &&
2297 !RD->hasTrivialDefaultConstructor() &&
2298 !RD->hasConstexprNonCopyMoveConstructor();
2299}
2300
2301static bool shouldOmitDefinition(codegenoptions::DebugInfoKind DebugKind,
2302 bool DebugTypeExtRefs, const RecordDecl *RD,
2303 const LangOptions &LangOpts) {
2304 if (DebugTypeExtRefs && isDefinedInClangModule(RD->getDefinition()))
2305 return true;
2306
2307 if (auto *ES = RD->getASTContext().getExternalSource())
2308 if (ES->hasExternalDefinitions(RD) == ExternalASTSource::EK_Always)
2309 return true;
2310
2311 if (DebugKind > codegenoptions::LimitedDebugInfo)
2312 return false;
2313
2314 if (!LangOpts.CPlusPlus)
2315 return false;
2316
2317 if (!RD->isCompleteDefinitionRequired())
2318 return true;
2319
2320 const auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
2321
2322 if (!CXXDecl)
2323 return false;
2324
2325 // Only emit complete debug info for a dynamic class when its vtable is
2326 // emitted. However, Microsoft debuggers don't resolve type information
2327 // across DLL boundaries, so skip this optimization if the class or any of its
2328 // methods are marked dllimport. This isn't a complete solution, since objects
2329 // without any dllimport methods can be used in one DLL and constructed in
2330 // another, but it is the current behavior of LimitedDebugInfo.
2331 if (CXXDecl->hasDefinition() && CXXDecl->isDynamicClass() &&
2332 !isClassOrMethodDLLImport(CXXDecl))
2333 return true;
2334
2335 TemplateSpecializationKind Spec = TSK_Undeclared;
2336 if (const auto *SD = dyn_cast<ClassTemplateSpecializationDecl>(RD))
2337 Spec = SD->getSpecializationKind();
2338
2339 if (Spec == TSK_ExplicitInstantiationDeclaration &&
2340 hasExplicitMemberDefinition(CXXDecl->method_begin(),
2341 CXXDecl->method_end()))
2342 return true;
2343
2344 // In constructor homing mode, only emit complete debug info for a class
2345 // when its constructor is emitted.
2346 if ((DebugKind == codegenoptions::DebugInfoConstructor) &&
2347 canUseCtorHoming(CXXDecl))
2348 return true;
2349
2350 return false;
2351}
2352
2353void CGDebugInfo::completeRequiredType(const RecordDecl *RD) {
2354 if (shouldOmitDefinition(DebugKind, DebugTypeExtRefs, RD, CGM.getLangOpts()))
2355 return;
2356
2357 QualType Ty = CGM.getContext().getRecordType(RD);
2358 llvm::DIType *T = getTypeOrNull(Ty);
2359 if (T && T->isForwardDecl())
2360 completeClassData(RD);
2361}
2362
2363llvm::DIType *CGDebugInfo::CreateType(const RecordType *Ty) {
2364 RecordDecl *RD = Ty->getDecl();
2365 llvm::DIType *T = cast_or_null<llvm::DIType>(getTypeOrNull(QualType(Ty, 0)));
2366 if (T || shouldOmitDefinition(DebugKind, DebugTypeExtRefs, RD,
2367 CGM.getLangOpts())) {
2368 if (!T)
2369 T = getOrCreateRecordFwdDecl(Ty, getDeclContextDescriptor(RD));
2370 return T;
2371 }
2372
2373 return CreateTypeDefinition(Ty);
2374}
2375
2376llvm::DIType *CGDebugInfo::CreateTypeDefinition(const RecordType *Ty) {
2377 RecordDecl *RD = Ty->getDecl();
2378
2379 // Get overall information about the record type for the debug info.
2380 llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
2381
2382 // Records and classes and unions can all be recursive. To handle them, we
2383 // first generate a debug descriptor for the struct as a forward declaration.
2384 // Then (if it is a definition) we go through and get debug info for all of
2385 // its members. Finally, we create a descriptor for the complete type (which
2386 // may refer to the forward decl if the struct is recursive) and replace all
2387 // uses of the forward declaration with the final definition.
2388 llvm::DICompositeType *FwdDecl = getOrCreateLimitedType(Ty, DefUnit);
2389
2390 const RecordDecl *D = RD->getDefinition();
2391 if (!D || !D->isCompleteDefinition())
2392 return FwdDecl;
2393
2394 if (const auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD))
2395 CollectContainingType(CXXDecl, FwdDecl);
2396
2397 // Push the struct on region stack.
2398 LexicalBlockStack.emplace_back(&*FwdDecl);
2399 RegionMap[Ty->getDecl()].reset(FwdDecl);
2400
2401 // Convert all the elements.
2402 SmallVector<llvm::Metadata *, 16> EltTys;
2403 // what about nested types?
2404
2405 // Note: The split of CXXDecl information here is intentional, the
2406 // gdb tests will depend on a certain ordering at printout. The debug
2407 // information offsets are still correct if we merge them all together
2408 // though.
2409 const auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
2410 if (CXXDecl) {
2411 CollectCXXBases(CXXDecl, DefUnit, EltTys, FwdDecl);
2412 CollectVTableInfo(CXXDecl, DefUnit, EltTys, FwdDecl);
2413 }
2414
2415 // Collect data fields (including static variables and any initializers).
2416 CollectRecordFields(RD, DefUnit, EltTys, FwdDecl);
2417 if (CXXDecl)
2418 CollectCXXMemberFunctions(CXXDecl, DefUnit, EltTys, FwdDecl);
2419
2420 LexicalBlockStack.pop_back();
2421 RegionMap.erase(Ty->getDecl());
2422
2423 llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
2424 DBuilder.replaceArrays(FwdDecl, Elements);
2425
2426 if (FwdDecl->isTemporary())
2427 FwdDecl =
2428 llvm::MDNode::replaceWithPermanent(llvm::TempDICompositeType(FwdDecl));
2429
2430 RegionMap[Ty->getDecl()].reset(FwdDecl);
2431 return FwdDecl;
2432}
2433
2434llvm::DIType *CGDebugInfo::CreateType(const ObjCObjectType *Ty,
2435 llvm::DIFile *Unit) {
2436 // Ignore protocols.
2437 return getOrCreateType(Ty->getBaseType(), Unit);
2438}
2439
2440llvm::DIType *CGDebugInfo::CreateType(const ObjCTypeParamType *Ty,
2441 llvm::DIFile *Unit) {
2442 // Ignore protocols.
2443 SourceLocation Loc = Ty->getDecl()->getLocation();
2444
2445 // Use Typedefs to represent ObjCTypeParamType.
2446 return DBuilder.createTypedef(
2447 getOrCreateType(Ty->getDecl()->getUnderlyingType(), Unit),
2448 Ty->getDecl()->getName(), getOrCreateFile(Loc), getLineNumber(Loc),
2449 getDeclContextDescriptor(Ty->getDecl()));
2450}
2451
2452/// \return true if Getter has the default name for the property PD.
2453static bool hasDefaultGetterName(const ObjCPropertyDecl *PD,
2454 const ObjCMethodDecl *Getter) {
2455 assert(PD)((PD) ? static_cast<void> (0) : __assert_fail ("PD", "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2455, __PRETTY_FUNCTION__))
;
2456 if (!Getter)
2457 return true;
2458
2459 assert(Getter->getDeclName().isObjCZeroArgSelector())((Getter->getDeclName().isObjCZeroArgSelector()) ? static_cast
<void> (0) : __assert_fail ("Getter->getDeclName().isObjCZeroArgSelector()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2459, __PRETTY_FUNCTION__))
;
2460 return PD->getName() ==
2461 Getter->getDeclName().getObjCSelector().getNameForSlot(0);
2462}
2463
2464/// \return true if Setter has the default name for the property PD.
2465static bool hasDefaultSetterName(const ObjCPropertyDecl *PD,
2466 const ObjCMethodDecl *Setter) {
2467 assert(PD)((PD) ? static_cast<void> (0) : __assert_fail ("PD", "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2467, __PRETTY_FUNCTION__))
;
2468 if (!Setter)
2469 return true;
2470
2471 assert(Setter->getDeclName().isObjCOneArgSelector())((Setter->getDeclName().isObjCOneArgSelector()) ? static_cast
<void> (0) : __assert_fail ("Setter->getDeclName().isObjCOneArgSelector()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2471, __PRETTY_FUNCTION__))
;
2472 return SelectorTable::constructSetterName(PD->getName()) ==
2473 Setter->getDeclName().getObjCSelector().getNameForSlot(0);
2474}
2475
2476llvm::DIType *CGDebugInfo::CreateType(const ObjCInterfaceType *Ty,
2477 llvm::DIFile *Unit) {
2478 ObjCInterfaceDecl *ID = Ty->getDecl();
2479 if (!ID)
2480 return nullptr;
2481
2482 // Return a forward declaration if this type was imported from a clang module,
2483 // and this is not the compile unit with the implementation of the type (which
2484 // may contain hidden ivars).
2485 if (DebugTypeExtRefs && ID->isFromASTFile() && ID->getDefinition() &&
2486 !ID->getImplementation())
2487 return DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
2488 ID->getName(),
2489 getDeclContextDescriptor(ID), Unit, 0);
2490
2491 // Get overall information about the record type for the debug info.
2492 llvm::DIFile *DefUnit = getOrCreateFile(ID->getLocation());
2493 unsigned Line = getLineNumber(ID->getLocation());
2494 auto RuntimeLang =
2495 static_cast<llvm::dwarf::SourceLanguage>(TheCU->getSourceLanguage());
2496
2497 // If this is just a forward declaration return a special forward-declaration
2498 // debug type since we won't be able to lay out the entire type.
2499 ObjCInterfaceDecl *Def = ID->getDefinition();
2500 if (!Def || !Def->getImplementation()) {
2501 llvm::DIScope *Mod = getParentModuleOrNull(ID);
2502 llvm::DIType *FwdDecl = DBuilder.createReplaceableCompositeType(
2503 llvm::dwarf::DW_TAG_structure_type, ID->getName(), Mod ? Mod : TheCU,
2504 DefUnit, Line, RuntimeLang);
2505 ObjCInterfaceCache.push_back(ObjCInterfaceCacheEntry(Ty, FwdDecl, Unit));
2506 return FwdDecl;
2507 }
2508
2509 return CreateTypeDefinition(Ty, Unit);
2510}
2511
2512llvm::DIModule *CGDebugInfo::getOrCreateModuleRef(ASTSourceDescriptor Mod,
2513 bool CreateSkeletonCU) {
2514 // Use the Module pointer as the key into the cache. This is a
2515 // nullptr if the "Module" is a PCH, which is safe because we don't
2516 // support chained PCH debug info, so there can only be a single PCH.
2517 const Module *M = Mod.getModuleOrNull();
2518 auto ModRef = ModuleCache.find(M);
2519 if (ModRef != ModuleCache.end())
2520 return cast<llvm::DIModule>(ModRef->second);
2521
2522 // Macro definitions that were defined with "-D" on the command line.
2523 SmallString<128> ConfigMacros;
2524 {
2525 llvm::raw_svector_ostream OS(ConfigMacros);
2526 const auto &PPOpts = CGM.getPreprocessorOpts();
2527 unsigned I = 0;
2528 // Translate the macro definitions back into a command line.
2529 for (auto &M : PPOpts.Macros) {
2530 if (++I > 1)
2531 OS << " ";
2532 const std::string &Macro = M.first;
2533 bool Undef = M.second;
2534 OS << "\"-" << (Undef ? 'U' : 'D');
2535 for (char c : Macro)
2536 switch (c) {
2537 case '\\':
2538 OS << "\\\\";
2539 break;
2540 case '"':
2541 OS << "\\\"";
2542 break;
2543 default:
2544 OS << c;
2545 }
2546 OS << '\"';
2547 }
2548 }
2549
2550 bool IsRootModule = M ? !M->Parent : true;
2551 // When a module name is specified as -fmodule-name, that module gets a
2552 // clang::Module object, but it won't actually be built or imported; it will
2553 // be textual.
2554 if (CreateSkeletonCU && IsRootModule && Mod.getASTFile().empty() && M)
2555 assert(StringRef(M->Name).startswith(CGM.getLangOpts().ModuleName) &&((StringRef(M->Name).startswith(CGM.getLangOpts().ModuleName
) && "clang module without ASTFile must be specified by -fmodule-name"
) ? static_cast<void> (0) : __assert_fail ("StringRef(M->Name).startswith(CGM.getLangOpts().ModuleName) && \"clang module without ASTFile must be specified by -fmodule-name\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2556, __PRETTY_FUNCTION__))
2556 "clang module without ASTFile must be specified by -fmodule-name")((StringRef(M->Name).startswith(CGM.getLangOpts().ModuleName
) && "clang module without ASTFile must be specified by -fmodule-name"
) ? static_cast<void> (0) : __assert_fail ("StringRef(M->Name).startswith(CGM.getLangOpts().ModuleName) && \"clang module without ASTFile must be specified by -fmodule-name\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 2556, __PRETTY_FUNCTION__))
;
2557
2558 // Return a StringRef to the remapped Path.
2559 auto RemapPath = [this](StringRef Path) -> std::string {
2560 std::string Remapped = remapDIPath(Path);
2561 StringRef Relative(Remapped);
2562 StringRef CompDir = TheCU->getDirectory();
2563 if (Relative.consume_front(CompDir))
2564 Relative.consume_front(llvm::sys::path::get_separator());
2565
2566 return Relative.str();
2567 };
2568
2569 if (CreateSkeletonCU && IsRootModule && !Mod.getASTFile().empty()) {
2570 // PCH files don't have a signature field in the control block,
2571 // but LLVM detects skeleton CUs by looking for a non-zero DWO id.
2572 // We use the lower 64 bits for debug info.
2573
2574 uint64_t Signature = 0;
2575 if (const auto &ModSig = Mod.getSignature())
2576 Signature = ModSig.truncatedValue();
2577 else
2578 Signature = ~1ULL;
2579
2580 llvm::DIBuilder DIB(CGM.getModule());
2581 SmallString<0> PCM;
2582 if (!llvm::sys::path::is_absolute(Mod.getASTFile()))
2583 PCM = Mod.getPath();
2584 llvm::sys::path::append(PCM, Mod.getASTFile());
2585 DIB.createCompileUnit(
2586 TheCU->getSourceLanguage(),
2587 // TODO: Support "Source" from external AST providers?
2588 DIB.createFile(Mod.getModuleName(), TheCU->getDirectory()),
2589 TheCU->getProducer(), false, StringRef(), 0, RemapPath(PCM),
2590 llvm::DICompileUnit::FullDebug, Signature);
2591 DIB.finalize();
2592 }
2593
2594 llvm::DIModule *Parent =
2595 IsRootModule ? nullptr
2596 : getOrCreateModuleRef(ASTSourceDescriptor(*M->Parent),
2597 CreateSkeletonCU);
2598 std::string IncludePath = Mod.getPath().str();
2599 llvm::DIModule *DIMod =
2600 DBuilder.createModule(Parent, Mod.getModuleName(), ConfigMacros,
2601 RemapPath(IncludePath));
2602 ModuleCache[M].reset(DIMod);
2603 return DIMod;
2604}
2605
2606llvm::DIType *CGDebugInfo::CreateTypeDefinition(const ObjCInterfaceType *Ty,
2607 llvm::DIFile *Unit) {
2608 ObjCInterfaceDecl *ID = Ty->getDecl();
2609 llvm::DIFile *DefUnit = getOrCreateFile(ID->getLocation());
2610 unsigned Line = getLineNumber(ID->getLocation());
2611 unsigned RuntimeLang = TheCU->getSourceLanguage();
2612
2613 // Bit size, align and offset of the type.
2614 uint64_t Size = CGM.getContext().getTypeSize(Ty);
2615 auto Align = getTypeAlignIfRequired(Ty, CGM.getContext());
2616
2617 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
2618 if (ID->getImplementation())
2619 Flags |= llvm::DINode::FlagObjcClassComplete;
2620
2621 llvm::DIScope *Mod = getParentModuleOrNull(ID);
2622 llvm::DICompositeType *RealDecl = DBuilder.createStructType(
2623 Mod ? Mod : Unit, ID->getName(), DefUnit, Line, Size, Align, Flags,
2624 nullptr, llvm::DINodeArray(), RuntimeLang);
2625
2626 QualType QTy(Ty, 0);
2627 TypeCache[QTy.getAsOpaquePtr()].reset(RealDecl);
2628
2629 // Push the struct on region stack.
2630 LexicalBlockStack.emplace_back(RealDecl);
2631 RegionMap[Ty->getDecl()].reset(RealDecl);
2632
2633 // Convert all the elements.
2634 SmallVector<llvm::Metadata *, 16> EltTys;
2635
2636 ObjCInterfaceDecl *SClass = ID->getSuperClass();
2637 if (SClass) {
2638 llvm::DIType *SClassTy =
2639 getOrCreateType(CGM.getContext().getObjCInterfaceType(SClass), Unit);
2640 if (!SClassTy)
2641 return nullptr;
2642
2643 llvm::DIType *InhTag = DBuilder.createInheritance(RealDecl, SClassTy, 0, 0,
2644 llvm::DINode::FlagZero);
2645 EltTys.push_back(InhTag);
2646 }
2647
2648 // Create entries for all of the properties.
2649 auto AddProperty = [&](const ObjCPropertyDecl *PD) {
2650 SourceLocation Loc = PD->getLocation();
2651 llvm::DIFile *PUnit = getOrCreateFile(Loc);
2652 unsigned PLine = getLineNumber(Loc);
2653 ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
2654 ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
2655 llvm::MDNode *PropertyNode = DBuilder.createObjCProperty(
2656 PD->getName(), PUnit, PLine,
2657 hasDefaultGetterName(PD, Getter) ? ""
2658 : getSelectorName(PD->getGetterName()),
2659 hasDefaultSetterName(PD, Setter) ? ""
2660 : getSelectorName(PD->getSetterName()),
2661 PD->getPropertyAttributes(), getOrCreateType(PD->getType(), PUnit));
2662 EltTys.push_back(PropertyNode);
2663 };
2664 {
2665 llvm::SmallPtrSet<const IdentifierInfo *, 16> PropertySet;
2666 for (const ObjCCategoryDecl *ClassExt : ID->known_extensions())
2667 for (auto *PD : ClassExt->properties()) {
2668 PropertySet.insert(PD->getIdentifier());
2669 AddProperty(PD);
2670 }
2671 for (const auto *PD : ID->properties()) {
2672 // Don't emit duplicate metadata for properties that were already in a
2673 // class extension.
2674 if (!PropertySet.insert(PD->getIdentifier()).second)
2675 continue;
2676 AddProperty(PD);
2677 }
2678 }
2679
2680 const ASTRecordLayout &RL = CGM.getContext().getASTObjCInterfaceLayout(ID);
2681 unsigned FieldNo = 0;
2682 for (ObjCIvarDecl *Field = ID->all_declared_ivar_begin(); Field;
2683 Field = Field->getNextIvar(), ++FieldNo) {
2684 llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
2685 if (!FieldTy)
2686 return nullptr;
2687
2688 StringRef FieldName = Field->getName();
2689
2690 // Ignore unnamed fields.
2691 if (FieldName.empty())
2692 continue;
2693
2694 // Get the location for the field.
2695 llvm::DIFile *FieldDefUnit = getOrCreateFile(Field->getLocation());
2696 unsigned FieldLine = getLineNumber(Field->getLocation());
2697 QualType FType = Field->getType();
2698 uint64_t FieldSize = 0;
2699 uint32_t FieldAlign = 0;
2700
2701 if (!FType->isIncompleteArrayType()) {
2702
2703 // Bit size, align and offset of the type.
2704 FieldSize = Field->isBitField()
2705 ? Field->getBitWidthValue(CGM.getContext())
2706 : CGM.getContext().getTypeSize(FType);
2707 FieldAlign = getTypeAlignIfRequired(FType, CGM.getContext());
2708 }
2709
2710 uint64_t FieldOffset;
2711 if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
2712 // We don't know the runtime offset of an ivar if we're using the
2713 // non-fragile ABI. For bitfields, use the bit offset into the first
2714 // byte of storage of the bitfield. For other fields, use zero.
2715 if (Field->isBitField()) {
2716 FieldOffset =
2717 CGM.getObjCRuntime().ComputeBitfieldBitOffset(CGM, ID, Field);
2718 FieldOffset %= CGM.getContext().getCharWidth();
2719 } else {
2720 FieldOffset = 0;
2721 }
2722 } else {
2723 FieldOffset = RL.getFieldOffset(FieldNo);
2724 }
2725
2726 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
2727 if (Field->getAccessControl() == ObjCIvarDecl::Protected)
2728 Flags = llvm::DINode::FlagProtected;
2729 else if (Field->getAccessControl() == ObjCIvarDecl::Private)
2730 Flags = llvm::DINode::FlagPrivate;
2731 else if (Field->getAccessControl() == ObjCIvarDecl::Public)
2732 Flags = llvm::DINode::FlagPublic;
2733
2734 llvm::MDNode *PropertyNode = nullptr;
2735 if (ObjCImplementationDecl *ImpD = ID->getImplementation()) {
2736 if (ObjCPropertyImplDecl *PImpD =
2737 ImpD->FindPropertyImplIvarDecl(Field->getIdentifier())) {
2738 if (ObjCPropertyDecl *PD = PImpD->getPropertyDecl()) {
2739 SourceLocation Loc = PD->getLocation();
2740 llvm::DIFile *PUnit = getOrCreateFile(Loc);
2741 unsigned PLine = getLineNumber(Loc);
2742 ObjCMethodDecl *Getter = PImpD->getGetterMethodDecl();
2743 ObjCMethodDecl *Setter = PImpD->getSetterMethodDecl();
2744 PropertyNode = DBuilder.createObjCProperty(
2745 PD->getName(), PUnit, PLine,
2746 hasDefaultGetterName(PD, Getter)
2747 ? ""
2748 : getSelectorName(PD->getGetterName()),
2749 hasDefaultSetterName(PD, Setter)
2750 ? ""
2751 : getSelectorName(PD->getSetterName()),
2752 PD->getPropertyAttributes(),
2753 getOrCreateType(PD->getType(), PUnit));
2754 }
2755 }
2756 }
2757 FieldTy = DBuilder.createObjCIVar(FieldName, FieldDefUnit, FieldLine,
2758 FieldSize, FieldAlign, FieldOffset, Flags,
2759 FieldTy, PropertyNode);
2760 EltTys.push_back(FieldTy);
2761 }
2762
2763 llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
2764 DBuilder.replaceArrays(RealDecl, Elements);
2765
2766 LexicalBlockStack.pop_back();
2767 return RealDecl;
2768}
2769
2770llvm::DIType *CGDebugInfo::CreateType(const VectorType *Ty,
2771 llvm::DIFile *Unit) {
2772 llvm::DIType *ElementTy = getOrCreateType(Ty->getElementType(), Unit);
2773 int64_t Count = Ty->getNumElements();
2774
2775 llvm::Metadata *Subscript;
2776 QualType QTy(Ty, 0);
2777 auto SizeExpr = SizeExprCache.find(QTy);
2778 if (SizeExpr != SizeExprCache.end())
2779 Subscript = DBuilder.getOrCreateSubrange(
2780 SizeExpr->getSecond() /*count*/, nullptr /*lowerBound*/,
2781 nullptr /*upperBound*/, nullptr /*stride*/);
2782 else {
2783 auto *CountNode =
2784 llvm::ConstantAsMetadata::get(llvm::ConstantInt::getSigned(
2785 llvm::Type::getInt64Ty(CGM.getLLVMContext()), Count ? Count : -1));
2786 Subscript = DBuilder.getOrCreateSubrange(
2787 CountNode /*count*/, nullptr /*lowerBound*/, nullptr /*upperBound*/,
2788 nullptr /*stride*/);
2789 }
2790 llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscript);
2791
2792 uint64_t Size = CGM.getContext().getTypeSize(Ty);
2793 auto Align = getTypeAlignIfRequired(Ty, CGM.getContext());
2794
2795 return DBuilder.createVectorType(Size, Align, ElementTy, SubscriptArray);
2796}
2797
2798llvm::DIType *CGDebugInfo::CreateType(const ConstantMatrixType *Ty,
2799 llvm::DIFile *Unit) {
2800 // FIXME: Create another debug type for matrices
2801 // For the time being, it treats it like a nested ArrayType.
2802
2803 llvm::DIType *ElementTy = getOrCreateType(Ty->getElementType(), Unit);
2804 uint64_t Size = CGM.getContext().getTypeSize(Ty);
2805 uint32_t Align = getTypeAlignIfRequired(Ty, CGM.getContext());
2806
2807 // Create ranges for both dimensions.
2808 llvm::SmallVector<llvm::Metadata *, 2> Subscripts;
2809 auto *ColumnCountNode =
2810 llvm::ConstantAsMetadata::get(llvm::ConstantInt::getSigned(
2811 llvm::Type::getInt64Ty(CGM.getLLVMContext()), Ty->getNumColumns()));
2812 auto *RowCountNode =
2813 llvm::ConstantAsMetadata::get(llvm::ConstantInt::getSigned(
2814 llvm::Type::getInt64Ty(CGM.getLLVMContext()), Ty->getNumRows()));
2815 Subscripts.push_back(DBuilder.getOrCreateSubrange(
2816 ColumnCountNode /*count*/, nullptr /*lowerBound*/, nullptr /*upperBound*/,
2817 nullptr /*stride*/));
2818 Subscripts.push_back(DBuilder.getOrCreateSubrange(
2819 RowCountNode /*count*/, nullptr /*lowerBound*/, nullptr /*upperBound*/,
2820 nullptr /*stride*/));
2821 llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscripts);
2822 return DBuilder.createArrayType(Size, Align, ElementTy, SubscriptArray);
2823}
2824
2825llvm::DIType *CGDebugInfo::CreateType(const ArrayType *Ty, llvm::DIFile *Unit) {
2826 uint64_t Size;
2827 uint32_t Align;
2828
2829 // FIXME: make getTypeAlign() aware of VLAs and incomplete array types
2830 if (const auto *VAT = dyn_cast<VariableArrayType>(Ty)) {
2831 Size = 0;
2832 Align = getTypeAlignIfRequired(CGM.getContext().getBaseElementType(VAT),
2833 CGM.getContext());
2834 } else if (Ty->isIncompleteArrayType()) {
2835 Size = 0;
2836 if (Ty->getElementType()->isIncompleteType())
2837 Align = 0;
2838 else
2839 Align = getTypeAlignIfRequired(Ty->getElementType(), CGM.getContext());
2840 } else if (Ty->isIncompleteType()) {
2841 Size = 0;
2842 Align = 0;
2843 } else {
2844 // Size and align of the whole array, not the element type.
2845 Size = CGM.getContext().getTypeSize(Ty);
2846 Align = getTypeAlignIfRequired(Ty, CGM.getContext());
2847 }
2848
2849 // Add the dimensions of the array. FIXME: This loses CV qualifiers from
2850 // interior arrays, do we care? Why aren't nested arrays represented the
2851 // obvious/recursive way?
2852 SmallVector<llvm::Metadata *, 8> Subscripts;
2853 QualType EltTy(Ty, 0);
2854 while ((Ty = dyn_cast<ArrayType>(EltTy))) {
2855 // If the number of elements is known, then count is that number. Otherwise,
2856 // it's -1. This allows us to represent a subrange with an array of 0
2857 // elements, like this:
2858 //
2859 // struct foo {
2860 // int x[0];
2861 // };
2862 int64_t Count = -1; // Count == -1 is an unbounded array.
2863 if (const auto *CAT = dyn_cast<ConstantArrayType>(Ty))
2864 Count = CAT->getSize().getZExtValue();
2865 else if (const auto *VAT = dyn_cast<VariableArrayType>(Ty)) {
2866 if (Expr *Size = VAT->getSizeExpr()) {
2867 Expr::EvalResult Result;
2868 if (Size->EvaluateAsInt(Result, CGM.getContext()))
2869 Count = Result.Val.getInt().getExtValue();
2870 }
2871 }
2872
2873 auto SizeNode = SizeExprCache.find(EltTy);
2874 if (SizeNode != SizeExprCache.end())
2875 Subscripts.push_back(DBuilder.getOrCreateSubrange(
2876 SizeNode->getSecond() /*count*/, nullptr /*lowerBound*/,
2877 nullptr /*upperBound*/, nullptr /*stride*/));
2878 else {
2879 auto *CountNode =
2880 llvm::ConstantAsMetadata::get(llvm::ConstantInt::getSigned(
2881 llvm::Type::getInt64Ty(CGM.getLLVMContext()), Count));
2882 Subscripts.push_back(DBuilder.getOrCreateSubrange(
2883 CountNode /*count*/, nullptr /*lowerBound*/, nullptr /*upperBound*/,
2884 nullptr /*stride*/));
2885 }
2886 EltTy = Ty->getElementType();
2887 }
2888
2889 llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscripts);
2890
2891 return DBuilder.createArrayType(Size, Align, getOrCreateType(EltTy, Unit),
2892 SubscriptArray);
2893}
2894
2895llvm::DIType *CGDebugInfo::CreateType(const LValueReferenceType *Ty,
2896 llvm::DIFile *Unit) {
2897 return CreatePointerLikeType(llvm::dwarf::DW_TAG_reference_type, Ty,
2898 Ty->getPointeeType(), Unit);
2899}
2900
2901llvm::DIType *CGDebugInfo::CreateType(const RValueReferenceType *Ty,
2902 llvm::DIFile *Unit) {
2903 return CreatePointerLikeType(llvm::dwarf::DW_TAG_rvalue_reference_type, Ty,
2904 Ty->getPointeeType(), Unit);
2905}
2906
2907llvm::DIType *CGDebugInfo::CreateType(const MemberPointerType *Ty,
2908 llvm::DIFile *U) {
2909 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
2910 uint64_t Size = 0;
2911
2912 if (!Ty->isIncompleteType()) {
10
Assuming the condition is false
11
Taking false branch
2913 Size = CGM.getContext().getTypeSize(Ty);
2914
2915 // Set the MS inheritance model. There is no flag for the unspecified model.
2916 if (CGM.getTarget().getCXXABI().isMicrosoft()) {
2917 switch (Ty->getMostRecentCXXRecordDecl()->getMSInheritanceModel()) {
2918 case MSInheritanceModel::Single:
2919 Flags |= llvm::DINode::FlagSingleInheritance;
2920 break;
2921 case MSInheritanceModel::Multiple:
2922 Flags |= llvm::DINode::FlagMultipleInheritance;
2923 break;
2924 case MSInheritanceModel::Virtual:
2925 Flags |= llvm::DINode::FlagVirtualInheritance;
2926 break;
2927 case MSInheritanceModel::Unspecified:
2928 break;
2929 }
2930 }
2931 }
2932
2933 llvm::DIType *ClassType = getOrCreateType(QualType(Ty->getClass(), 0), U);
2934 if (Ty->isMemberDataPointerType())
12
Calling 'Type::isMemberDataPointerType'
16
Returning from 'Type::isMemberDataPointerType'
17
Taking false branch
2935 return DBuilder.createMemberPointerType(
2936 getOrCreateType(Ty->getPointeeType(), U), ClassType, Size, /*Align=*/0,
2937 Flags);
2938
2939 const FunctionProtoType *FPT =
19
'FPT' initialized to a null pointer value
2940 Ty->getPointeeType()->getAs<FunctionProtoType>();
18
Assuming the object is not a 'FunctionProtoType'
2941 return DBuilder.createMemberPointerType(
2942 getOrCreateInstanceMethodType(
21
Calling 'CGDebugInfo::getOrCreateInstanceMethodType'
2943 CXXMethodDecl::getThisType(FPT, Ty->getMostRecentCXXRecordDecl()),
2944 FPT, U, false),
20
Passing null pointer value via 2nd parameter 'Func'
2945 ClassType, Size, /*Align=*/0, Flags);
2946}
2947
2948llvm::DIType *CGDebugInfo::CreateType(const AtomicType *Ty, llvm::DIFile *U) {
2949 auto *FromTy = getOrCreateType(Ty->getValueType(), U);
2950 return DBuilder.createQualifiedType(llvm::dwarf::DW_TAG_atomic_type, FromTy);
2951}
2952
2953llvm::DIType *CGDebugInfo::CreateType(const PipeType *Ty, llvm::DIFile *U) {
2954 return getOrCreateType(Ty->getElementType(), U);
2955}
2956
2957llvm::DIType *CGDebugInfo::CreateEnumType(const EnumType *Ty) {
2958 const EnumDecl *ED = Ty->getDecl();
2959
2960 uint64_t Size = 0;
2961 uint32_t Align = 0;
2962 if (!ED->getTypeForDecl()->isIncompleteType()) {
2963 Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
2964 Align = getDeclAlignIfRequired(ED, CGM.getContext());
2965 }
2966
2967 SmallString<256> Identifier = getTypeIdentifier(Ty, CGM, TheCU);
2968
2969 bool isImportedFromModule =
2970 DebugTypeExtRefs && ED->isFromASTFile() && ED->getDefinition();
2971
2972 // If this is just a forward declaration, construct an appropriately
2973 // marked node and just return it.
2974 if (isImportedFromModule || !ED->getDefinition()) {
2975 // Note that it is possible for enums to be created as part of
2976 // their own declcontext. In this case a FwdDecl will be created
2977 // twice. This doesn't cause a problem because both FwdDecls are
2978 // entered into the ReplaceMap: finalize() will replace the first
2979 // FwdDecl with the second and then replace the second with
2980 // complete type.
2981 llvm::DIScope *EDContext = getDeclContextDescriptor(ED);
2982 llvm::DIFile *DefUnit = getOrCreateFile(ED->getLocation());
2983 llvm::TempDIScope TmpContext(DBuilder.createReplaceableCompositeType(
2984 llvm::dwarf::DW_TAG_enumeration_type, "", TheCU, DefUnit, 0));
2985
2986 unsigned Line = getLineNumber(ED->getLocation());
2987 StringRef EDName = ED->getName();
2988 llvm::DIType *RetTy = DBuilder.createReplaceableCompositeType(
2989 llvm::dwarf::DW_TAG_enumeration_type, EDName, EDContext, DefUnit, Line,
2990 0, Size, Align, llvm::DINode::FlagFwdDecl, Identifier);
2991
2992 ReplaceMap.emplace_back(
2993 std::piecewise_construct, std::make_tuple(Ty),
2994 std::make_tuple(static_cast<llvm::Metadata *>(RetTy)));
2995 return RetTy;
2996 }
2997
2998 return CreateTypeDefinition(Ty);
2999}
3000
3001llvm::DIType *CGDebugInfo::CreateTypeDefinition(const EnumType *Ty) {
3002 const EnumDecl *ED = Ty->getDecl();
3003 uint64_t Size = 0;
3004 uint32_t Align = 0;
3005 if (!ED->getTypeForDecl()->isIncompleteType()) {
3006 Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
3007 Align = getDeclAlignIfRequired(ED, CGM.getContext());
3008 }
3009
3010 SmallString<256> Identifier = getTypeIdentifier(Ty, CGM, TheCU);
3011
3012 // Create elements for each enumerator.
3013 SmallVector<llvm::Metadata *, 16> Enumerators;
3014 ED = ED->getDefinition();
3015 bool IsSigned = ED->getIntegerType()->isSignedIntegerType();
3016 for (const auto *Enum : ED->enumerators()) {
3017 const auto &InitVal = Enum->getInitVal();
3018 auto Value = IsSigned ? InitVal.getSExtValue() : InitVal.getZExtValue();
3019 Enumerators.push_back(
3020 DBuilder.createEnumerator(Enum->getName(), Value, !IsSigned));
3021 }
3022
3023 // Return a CompositeType for the enum itself.
3024 llvm::DINodeArray EltArray = DBuilder.getOrCreateArray(Enumerators);
3025
3026 llvm::DIFile *DefUnit = getOrCreateFile(ED->getLocation());
3027 unsigned Line = getLineNumber(ED->getLocation());
3028 llvm::DIScope *EnumContext = getDeclContextDescriptor(ED);
3029 llvm::DIType *ClassTy = getOrCreateType(ED->getIntegerType(), DefUnit);
3030 return DBuilder.createEnumerationType(EnumContext, ED->getName(), DefUnit,
3031 Line, Size, Align, EltArray, ClassTy,
3032 Identifier, ED->isScoped());
3033}
3034
3035llvm::DIMacro *CGDebugInfo::CreateMacro(llvm::DIMacroFile *Parent,
3036 unsigned MType, SourceLocation LineLoc,
3037 StringRef Name, StringRef Value) {
3038 unsigned Line = LineLoc.isInvalid() ? 0 : getLineNumber(LineLoc);
3039 return DBuilder.createMacro(Parent, Line, MType, Name, Value);
3040}
3041
3042llvm::DIMacroFile *CGDebugInfo::CreateTempMacroFile(llvm::DIMacroFile *Parent,
3043 SourceLocation LineLoc,
3044 SourceLocation FileLoc) {
3045 llvm::DIFile *FName = getOrCreateFile(FileLoc);
3046 unsigned Line = LineLoc.isInvalid() ? 0 : getLineNumber(LineLoc);
3047 return DBuilder.createTempMacroFile(Parent, Line, FName);
3048}
3049
3050static QualType UnwrapTypeForDebugInfo(QualType T, const ASTContext &C) {
3051 Qualifiers Quals;
3052 do {
3053 Qualifiers InnerQuals = T.getLocalQualifiers();
3054 // Qualifiers::operator+() doesn't like it if you add a Qualifier
3055 // that is already there.
3056 Quals += Qualifiers::removeCommonQualifiers(Quals, InnerQuals);
3057 Quals += InnerQuals;
3058 QualType LastT = T;
3059 switch (T->getTypeClass()) {
3060 default:
3061 return C.getQualifiedType(T.getTypePtr(), Quals);
3062 case Type::TemplateSpecialization: {
3063 const auto *Spec = cast<TemplateSpecializationType>(T);
3064 if (Spec->isTypeAlias())
3065 return C.getQualifiedType(T.getTypePtr(), Quals);
3066 T = Spec->desugar();
3067 break;
3068 }
3069 case Type::TypeOfExpr:
3070 T = cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType();
3071 break;
3072 case Type::TypeOf:
3073 T = cast<TypeOfType>(T)->getUnderlyingType();
3074 break;
3075 case Type::Decltype:
3076 T = cast<DecltypeType>(T)->getUnderlyingType();
3077 break;
3078 case Type::UnaryTransform:
3079 T = cast<UnaryTransformType>(T)->getUnderlyingType();
3080 break;
3081 case Type::Attributed:
3082 T = cast<AttributedType>(T)->getEquivalentType();
3083 break;
3084 case Type::Elaborated:
3085 T = cast<ElaboratedType>(T)->getNamedType();
3086 break;
3087 case Type::Paren:
3088 T = cast<ParenType>(T)->getInnerType();
3089 break;
3090 case Type::MacroQualified:
3091 T = cast<MacroQualifiedType>(T)->getUnderlyingType();
3092 break;
3093 case Type::SubstTemplateTypeParm:
3094 T = cast<SubstTemplateTypeParmType>(T)->getReplacementType();
3095 break;
3096 case Type::Auto:
3097 case Type::DeducedTemplateSpecialization: {
3098 QualType DT = cast<DeducedType>(T)->getDeducedType();
3099 assert(!DT.isNull() && "Undeduced types shouldn't reach here.")((!DT.isNull() && "Undeduced types shouldn't reach here."
) ? static_cast<void> (0) : __assert_fail ("!DT.isNull() && \"Undeduced types shouldn't reach here.\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3099, __PRETTY_FUNCTION__))
;
3100 T = DT;
3101 break;
3102 }
3103 case Type::Adjusted:
3104 case Type::Decayed:
3105 // Decayed and adjusted types use the adjusted type in LLVM and DWARF.
3106 T = cast<AdjustedType>(T)->getAdjustedType();
3107 break;
3108 }
3109
3110 assert(T != LastT && "Type unwrapping failed to unwrap!")((T != LastT && "Type unwrapping failed to unwrap!") ?
static_cast<void> (0) : __assert_fail ("T != LastT && \"Type unwrapping failed to unwrap!\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3110, __PRETTY_FUNCTION__))
;
3111 (void)LastT;
3112 } while (true);
3113}
3114
3115llvm::DIType *CGDebugInfo::getTypeOrNull(QualType Ty) {
3116
3117 // Unwrap the type as needed for debug information.
3118 Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
3119
3120 auto It = TypeCache.find(Ty.getAsOpaquePtr());
3121 if (It != TypeCache.end()) {
3122 // Verify that the debug info still exists.
3123 if (llvm::Metadata *V = It->second)
3124 return cast<llvm::DIType>(V);
3125 }
3126
3127 return nullptr;
3128}
3129
3130void CGDebugInfo::completeTemplateDefinition(
3131 const ClassTemplateSpecializationDecl &SD) {
3132 if (DebugKind <= codegenoptions::DebugLineTablesOnly)
3133 return;
3134 completeUnusedClass(SD);
3135}
3136
3137void CGDebugInfo::completeUnusedClass(const CXXRecordDecl &D) {
3138 if (DebugKind <= codegenoptions::DebugLineTablesOnly)
3139 return;
3140
3141 completeClassData(&D);
3142 // In case this type has no member function definitions being emitted, ensure
3143 // it is retained
3144 RetainedTypes.push_back(CGM.getContext().getRecordType(&D).getAsOpaquePtr());
3145}
3146
3147llvm::DIType *CGDebugInfo::getOrCreateType(QualType Ty, llvm::DIFile *Unit) {
3148 if (Ty.isNull())
3
Taking false branch
3149 return nullptr;
3150
3151 llvm::TimeTraceScope TimeScope("DebugType", [&]() {
3152 std::string Name;
3153 llvm::raw_string_ostream OS(Name);
3154 Ty.print(OS, getPrintingPolicy());
3155 return Name;
3156 });
3157
3158 // Unwrap the type as needed for debug information.
3159 Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
3160
3161 if (auto *T
3.1
'T' is null
3.1
'T' is null
= getTypeOrNull(Ty))
4
Taking false branch
3162 return T;
3163
3164 llvm::DIType *Res = CreateTypeNode(Ty, Unit);
5
Calling 'CGDebugInfo::CreateTypeNode'
3165 void *TyPtr = Ty.getAsOpaquePtr();
3166
3167 // And update the type cache.
3168 TypeCache[TyPtr].reset(Res);
3169
3170 return Res;
3171}
3172
3173llvm::DIModule *CGDebugInfo::getParentModuleOrNull(const Decl *D) {
3174 // A forward declaration inside a module header does not belong to the module.
3175 if (isa<RecordDecl>(D) && !cast<RecordDecl>(D)->getDefinition())
3176 return nullptr;
3177 if (DebugTypeExtRefs && D->isFromASTFile()) {
3178 // Record a reference to an imported clang module or precompiled header.
3179 auto *Reader = CGM.getContext().getExternalSource();
3180 auto Idx = D->getOwningModuleID();
3181 auto Info = Reader->getSourceDescriptor(Idx);
3182 if (Info)
3183 return getOrCreateModuleRef(*Info, /*SkeletonCU=*/true);
3184 } else if (ClangModuleMap) {
3185 // We are building a clang module or a precompiled header.
3186 //
3187 // TODO: When D is a CXXRecordDecl or a C++ Enum, the ODR applies
3188 // and it wouldn't be necessary to specify the parent scope
3189 // because the type is already unique by definition (it would look
3190 // like the output of -fno-standalone-debug). On the other hand,
3191 // the parent scope helps a consumer to quickly locate the object
3192 // file where the type's definition is located, so it might be
3193 // best to make this behavior a command line or debugger tuning
3194 // option.
3195 if (Module *M = D->getOwningModule()) {
3196 // This is a (sub-)module.
3197 auto Info = ASTSourceDescriptor(*M);
3198 return getOrCreateModuleRef(Info, /*SkeletonCU=*/false);
3199 } else {
3200 // This the precompiled header being built.
3201 return getOrCreateModuleRef(PCHDescriptor, /*SkeletonCU=*/false);
3202 }
3203 }
3204
3205 return nullptr;
3206}
3207
3208llvm::DIType *CGDebugInfo::CreateTypeNode(QualType Ty, llvm::DIFile *Unit) {
3209 // Handle qualifiers, which recursively handles what they refer to.
3210 if (Ty.hasLocalQualifiers())
6
Assuming the condition is false
7
Taking false branch
3211 return CreateQualifiedType(Ty, Unit);
3212
3213 // Work out details of type.
3214 switch (Ty->getTypeClass()) {
8
Control jumps to 'case MemberPointer:' at line 3262
3215#define TYPE(Class, Base)
3216#define ABSTRACT_TYPE(Class, Base)
3217#define NON_CANONICAL_TYPE(Class, Base)
3218#define DEPENDENT_TYPE(Class, Base) case Type::Class:
3219#include "clang/AST/TypeNodes.inc"
3220 llvm_unreachable("Dependent types cannot show up in debug information")::llvm::llvm_unreachable_internal("Dependent types cannot show up in debug information"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3220)
;
3221
3222 case Type::ExtVector:
3223 case Type::Vector:
3224 return CreateType(cast<VectorType>(Ty), Unit);
3225 case Type::ConstantMatrix:
3226 return CreateType(cast<ConstantMatrixType>(Ty), Unit);
3227 case Type::ObjCObjectPointer:
3228 return CreateType(cast<ObjCObjectPointerType>(Ty), Unit);
3229 case Type::ObjCObject:
3230 return CreateType(cast<ObjCObjectType>(Ty), Unit);
3231 case Type::ObjCTypeParam:
3232 return CreateType(cast<ObjCTypeParamType>(Ty), Unit);
3233 case Type::ObjCInterface:
3234 return CreateType(cast<ObjCInterfaceType>(Ty), Unit);
3235 case Type::Builtin:
3236 return CreateType(cast<BuiltinType>(Ty));
3237 case Type::Complex:
3238 return CreateType(cast<ComplexType>(Ty));
3239 case Type::Pointer:
3240 return CreateType(cast<PointerType>(Ty), Unit);
3241 case Type::BlockPointer:
3242 return CreateType(cast<BlockPointerType>(Ty), Unit);
3243 case Type::Typedef:
3244 return CreateType(cast<TypedefType>(Ty), Unit);
3245 case Type::Record:
3246 return CreateType(cast<RecordType>(Ty));
3247 case Type::Enum:
3248 return CreateEnumType(cast<EnumType>(Ty));
3249 case Type::FunctionProto:
3250 case Type::FunctionNoProto:
3251 return CreateType(cast<FunctionType>(Ty), Unit);
3252 case Type::ConstantArray:
3253 case Type::VariableArray:
3254 case Type::IncompleteArray:
3255 return CreateType(cast<ArrayType>(Ty), Unit);
3256
3257 case Type::LValueReference:
3258 return CreateType(cast<LValueReferenceType>(Ty), Unit);
3259 case Type::RValueReference:
3260 return CreateType(cast<RValueReferenceType>(Ty), Unit);
3261
3262 case Type::MemberPointer:
3263 return CreateType(cast<MemberPointerType>(Ty), Unit);
9
Calling 'CGDebugInfo::CreateType'
3264
3265 case Type::Atomic:
3266 return CreateType(cast<AtomicType>(Ty), Unit);
3267
3268 case Type::ExtInt:
3269 return CreateType(cast<ExtIntType>(Ty));
3270 case Type::Pipe:
3271 return CreateType(cast<PipeType>(Ty), Unit);
3272
3273 case Type::TemplateSpecialization:
3274 return CreateType(cast<TemplateSpecializationType>(Ty), Unit);
3275
3276 case Type::Auto:
3277 case Type::Attributed:
3278 case Type::Adjusted:
3279 case Type::Decayed:
3280 case Type::DeducedTemplateSpecialization:
3281 case Type::Elaborated:
3282 case Type::Paren:
3283 case Type::MacroQualified:
3284 case Type::SubstTemplateTypeParm:
3285 case Type::TypeOfExpr:
3286 case Type::TypeOf:
3287 case Type::Decltype:
3288 case Type::UnaryTransform:
3289 break;
3290 }
3291
3292 llvm_unreachable("type should have been unwrapped!")::llvm::llvm_unreachable_internal("type should have been unwrapped!"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3292)
;
3293}
3294
3295llvm::DICompositeType *CGDebugInfo::getOrCreateLimitedType(const RecordType *Ty,
3296 llvm::DIFile *Unit) {
3297 QualType QTy(Ty, 0);
3298
3299 auto *T = cast_or_null<llvm::DICompositeType>(getTypeOrNull(QTy));
3300
3301 // We may have cached a forward decl when we could have created
3302 // a non-forward decl. Go ahead and create a non-forward decl
3303 // now.
3304 if (T && !T->isForwardDecl())
3305 return T;
3306
3307 // Otherwise create the type.
3308 llvm::DICompositeType *Res = CreateLimitedType(Ty);
3309
3310 // Propagate members from the declaration to the definition
3311 // CreateType(const RecordType*) will overwrite this with the members in the
3312 // correct order if the full type is needed.
3313 DBuilder.replaceArrays(Res, T ? T->getElements() : llvm::DINodeArray());
3314
3315 // And update the type cache.
3316 TypeCache[QTy.getAsOpaquePtr()].reset(Res);
3317 return Res;
3318}
3319
3320// TODO: Currently used for context chains when limiting debug info.
3321llvm::DICompositeType *CGDebugInfo::CreateLimitedType(const RecordType *Ty) {
3322 RecordDecl *RD = Ty->getDecl();
3323
3324 // Get overall information about the record type for the debug info.
3325 llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
3326 unsigned Line = getLineNumber(RD->getLocation());
3327 StringRef RDName = getClassName(RD);
3328
3329 llvm::DIScope *RDContext = getDeclContextDescriptor(RD);
3330
3331 // If we ended up creating the type during the context chain construction,
3332 // just return that.
3333 auto *T = cast_or_null<llvm::DICompositeType>(
3334 getTypeOrNull(CGM.getContext().getRecordType(RD)));
3335 if (T && (!T->isForwardDecl() || !RD->getDefinition()))
3336 return T;
3337
3338 // If this is just a forward or incomplete declaration, construct an
3339 // appropriately marked node and just return it.
3340 const RecordDecl *D = RD->getDefinition();
3341 if (!D || !D->isCompleteDefinition())
3342 return getOrCreateRecordFwdDecl(Ty, RDContext);
3343
3344 uint64_t Size = CGM.getContext().getTypeSize(Ty);
3345 auto Align = getDeclAlignIfRequired(D, CGM.getContext());
3346
3347 SmallString<256> Identifier = getTypeIdentifier(Ty, CGM, TheCU);
3348
3349 // Explicitly record the calling convention and export symbols for C++
3350 // records.
3351 auto Flags = llvm::DINode::FlagZero;
3352 if (auto CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
3353 if (CGM.getCXXABI().getRecordArgABI(CXXRD) == CGCXXABI::RAA_Indirect)
3354 Flags |= llvm::DINode::FlagTypePassByReference;
3355 else
3356 Flags |= llvm::DINode::FlagTypePassByValue;
3357
3358 // Record if a C++ record is non-trivial type.
3359 if (!CXXRD->isTrivial())
3360 Flags |= llvm::DINode::FlagNonTrivial;
3361
3362 // Record exports it symbols to the containing structure.
3363 if (CXXRD->isAnonymousStructOrUnion())
3364 Flags |= llvm::DINode::FlagExportSymbols;
3365 }
3366
3367 llvm::DICompositeType *RealDecl = DBuilder.createReplaceableCompositeType(
3368 getTagForRecord(RD), RDName, RDContext, DefUnit, Line, 0, Size, Align,
3369 Flags, Identifier);
3370
3371 // Elements of composite types usually have back to the type, creating
3372 // uniquing cycles. Distinct nodes are more efficient.
3373 switch (RealDecl->getTag()) {
3374 default:
3375 llvm_unreachable("invalid composite type tag")::llvm::llvm_unreachable_internal("invalid composite type tag"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3375)
;
3376
3377 case llvm::dwarf::DW_TAG_array_type:
3378 case llvm::dwarf::DW_TAG_enumeration_type:
3379 // Array elements and most enumeration elements don't have back references,
3380 // so they don't tend to be involved in uniquing cycles and there is some
3381 // chance of merging them when linking together two modules. Only make
3382 // them distinct if they are ODR-uniqued.
3383 if (Identifier.empty())
3384 break;
3385 LLVM_FALLTHROUGH[[gnu::fallthrough]];
3386
3387 case llvm::dwarf::DW_TAG_structure_type:
3388 case llvm::dwarf::DW_TAG_union_type:
3389 case llvm::dwarf::DW_TAG_class_type:
3390 // Immediately resolve to a distinct node.
3391 RealDecl =
3392 llvm::MDNode::replaceWithDistinct(llvm::TempDICompositeType(RealDecl));
3393 break;
3394 }
3395
3396 RegionMap[Ty->getDecl()].reset(RealDecl);
3397 TypeCache[QualType(Ty, 0).getAsOpaquePtr()].reset(RealDecl);
3398
3399 if (const auto *TSpecial = dyn_cast<ClassTemplateSpecializationDecl>(RD))
3400 DBuilder.replaceArrays(RealDecl, llvm::DINodeArray(),
3401 CollectCXXTemplateParams(TSpecial, DefUnit));
3402 return RealDecl;
3403}
3404
3405void CGDebugInfo::CollectContainingType(const CXXRecordDecl *RD,
3406 llvm::DICompositeType *RealDecl) {
3407 // A class's primary base or the class itself contains the vtable.
3408 llvm::DICompositeType *ContainingType = nullptr;
3409 const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
3410 if (const CXXRecordDecl *PBase = RL.getPrimaryBase()) {
3411 // Seek non-virtual primary base root.
3412 while (1) {
3413 const ASTRecordLayout &BRL = CGM.getContext().getASTRecordLayout(PBase);
3414 const CXXRecordDecl *PBT = BRL.getPrimaryBase();
3415 if (PBT && !BRL.isPrimaryBaseVirtual())
3416 PBase = PBT;
3417 else
3418 break;
3419 }
3420 ContainingType = cast<llvm::DICompositeType>(
3421 getOrCreateType(QualType(PBase->getTypeForDecl(), 0),
3422 getOrCreateFile(RD->getLocation())));
3423 } else if (RD->isDynamicClass())
3424 ContainingType = RealDecl;
3425
3426 DBuilder.replaceVTableHolder(RealDecl, ContainingType);
3427}
3428
3429llvm::DIType *CGDebugInfo::CreateMemberType(llvm::DIFile *Unit, QualType FType,
3430 StringRef Name, uint64_t *Offset) {
3431 llvm::DIType *FieldTy = CGDebugInfo::getOrCreateType(FType, Unit);
3432 uint64_t FieldSize = CGM.getContext().getTypeSize(FType);
3433 auto FieldAlign = getTypeAlignIfRequired(FType, CGM.getContext());
3434 llvm::DIType *Ty =
3435 DBuilder.createMemberType(Unit, Name, Unit, 0, FieldSize, FieldAlign,
3436 *Offset, llvm::DINode::FlagZero, FieldTy);
3437 *Offset += FieldSize;
3438 return Ty;
3439}
3440
3441void CGDebugInfo::collectFunctionDeclProps(GlobalDecl GD, llvm::DIFile *Unit,
3442 StringRef &Name,
3443 StringRef &LinkageName,
3444 llvm::DIScope *&FDContext,
3445 llvm::DINodeArray &TParamsArray,
3446 llvm::DINode::DIFlags &Flags) {
3447 const auto *FD = cast<FunctionDecl>(GD.getDecl());
3448 Name = getFunctionName(FD);
3449 // Use mangled name as linkage name for C/C++ functions.
3450 if (FD->hasPrototype()) {
3451 LinkageName = CGM.getMangledName(GD);
3452 Flags |= llvm::DINode::FlagPrototyped;
3453 }
3454 // No need to replicate the linkage name if it isn't different from the
3455 // subprogram name, no need to have it at all unless coverage is enabled or
3456 // debug is set to more than just line tables or extra debug info is needed.
3457 if (LinkageName == Name || (!CGM.getCodeGenOpts().EmitGcovArcs &&
3458 !CGM.getCodeGenOpts().EmitGcovNotes &&
3459 !CGM.getCodeGenOpts().DebugInfoForProfiling &&
3460 DebugKind <= codegenoptions::DebugLineTablesOnly))
3461 LinkageName = StringRef();
3462
3463 if (CGM.getCodeGenOpts().hasReducedDebugInfo()) {
3464 if (const NamespaceDecl *NSDecl =
3465 dyn_cast_or_null<NamespaceDecl>(FD->getDeclContext()))
3466 FDContext = getOrCreateNamespace(NSDecl);
3467 else if (const RecordDecl *RDecl =
3468 dyn_cast_or_null<RecordDecl>(FD->getDeclContext())) {
3469 llvm::DIScope *Mod = getParentModuleOrNull(RDecl);
3470 FDContext = getContextDescriptor(RDecl, Mod ? Mod : TheCU);
3471 }
3472 // Check if it is a noreturn-marked function
3473 if (FD->isNoReturn())
3474 Flags |= llvm::DINode::FlagNoReturn;
3475 // Collect template parameters.
3476 TParamsArray = CollectFunctionTemplateParams(FD, Unit);
3477 }
3478}
3479
3480void CGDebugInfo::collectVarDeclProps(const VarDecl *VD, llvm::DIFile *&Unit,
3481 unsigned &LineNo, QualType &T,
3482 StringRef &Name, StringRef &LinkageName,
3483 llvm::MDTuple *&TemplateParameters,
3484 llvm::DIScope *&VDContext) {
3485 Unit = getOrCreateFile(VD->getLocation());
3486 LineNo = getLineNumber(VD->getLocation());
3487
3488 setLocation(VD->getLocation());
3489
3490 T = VD->getType();
3491 if (T->isIncompleteArrayType()) {
3492 // CodeGen turns int[] into int[1] so we'll do the same here.
3493 llvm::APInt ConstVal(32, 1);
3494 QualType ET = CGM.getContext().getAsArrayType(T)->getElementType();
3495
3496 T = CGM.getContext().getConstantArrayType(ET, ConstVal, nullptr,
3497 ArrayType::Normal, 0);
3498 }
3499
3500 Name = VD->getName();
3501 if (VD->getDeclContext() && !isa<FunctionDecl>(VD->getDeclContext()) &&
3502 !isa<ObjCMethodDecl>(VD->getDeclContext()))
3503 LinkageName = CGM.getMangledName(VD);
3504 if (LinkageName == Name)
3505 LinkageName = StringRef();
3506
3507 if (isa<VarTemplateSpecializationDecl>(VD)) {
3508 llvm::DINodeArray parameterNodes = CollectVarTemplateParams(VD, &*Unit);
3509 TemplateParameters = parameterNodes.get();
3510 } else {
3511 TemplateParameters = nullptr;
3512 }
3513
3514 // Since we emit declarations (DW_AT_members) for static members, place the
3515 // definition of those static members in the namespace they were declared in
3516 // in the source code (the lexical decl context).
3517 // FIXME: Generalize this for even non-member global variables where the
3518 // declaration and definition may have different lexical decl contexts, once
3519 // we have support for emitting declarations of (non-member) global variables.
3520 const DeclContext *DC = VD->isStaticDataMember() ? VD->getLexicalDeclContext()
3521 : VD->getDeclContext();
3522 // When a record type contains an in-line initialization of a static data
3523 // member, and the record type is marked as __declspec(dllexport), an implicit
3524 // definition of the member will be created in the record context. DWARF
3525 // doesn't seem to have a nice way to describe this in a form that consumers
3526 // are likely to understand, so fake the "normal" situation of a definition
3527 // outside the class by putting it in the global scope.
3528 if (DC->isRecord())
3529 DC = CGM.getContext().getTranslationUnitDecl();
3530
3531 llvm::DIScope *Mod = getParentModuleOrNull(VD);
3532 VDContext = getContextDescriptor(cast<Decl>(DC), Mod ? Mod : TheCU);
3533}
3534
3535llvm::DISubprogram *CGDebugInfo::getFunctionFwdDeclOrStub(GlobalDecl GD,
3536 bool Stub) {
3537 llvm::DINodeArray TParamsArray;
3538 StringRef Name, LinkageName;
3539 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
3540 llvm::DISubprogram::DISPFlags SPFlags = llvm::DISubprogram::SPFlagZero;
3541 SourceLocation Loc = GD.getDecl()->getLocation();
3542 llvm::DIFile *Unit = getOrCreateFile(Loc);
3543 llvm::DIScope *DContext = Unit;
3544 unsigned Line = getLineNumber(Loc);
3545 collectFunctionDeclProps(GD, Unit, Name, LinkageName, DContext, TParamsArray,
3546 Flags);
3547 auto *FD = cast<FunctionDecl>(GD.getDecl());
3548
3549 // Build function type.
3550 SmallVector<QualType, 16> ArgTypes;
3551 for (const ParmVarDecl *Parm : FD->parameters())
3552 ArgTypes.push_back(Parm->getType());
3553
3554 CallingConv CC = FD->getType()->castAs<FunctionType>()->getCallConv();
3555 QualType FnType = CGM.getContext().getFunctionType(
3556 FD->getReturnType(), ArgTypes, FunctionProtoType::ExtProtoInfo(CC));
3557 if (!FD->isExternallyVisible())
3558 SPFlags |= llvm::DISubprogram::SPFlagLocalToUnit;
3559 if (CGM.getLangOpts().Optimize)
3560 SPFlags |= llvm::DISubprogram::SPFlagOptimized;
3561
3562 if (Stub) {
3563 Flags |= getCallSiteRelatedAttrs();
3564 SPFlags |= llvm::DISubprogram::SPFlagDefinition;
3565 return DBuilder.createFunction(
3566 DContext, Name, LinkageName, Unit, Line,
3567 getOrCreateFunctionType(GD.getDecl(), FnType, Unit), 0, Flags, SPFlags,
3568 TParamsArray.get(), getFunctionDeclaration(FD));
3569 }
3570
3571 llvm::DISubprogram *SP = DBuilder.createTempFunctionFwdDecl(
3572 DContext, Name, LinkageName, Unit, Line,
3573 getOrCreateFunctionType(GD.getDecl(), FnType, Unit), 0, Flags, SPFlags,
3574 TParamsArray.get(), getFunctionDeclaration(FD));
3575 const FunctionDecl *CanonDecl = FD->getCanonicalDecl();
3576 FwdDeclReplaceMap.emplace_back(std::piecewise_construct,
3577 std::make_tuple(CanonDecl),
3578 std::make_tuple(SP));
3579 return SP;
3580}
3581
3582llvm::DISubprogram *CGDebugInfo::getFunctionForwardDeclaration(GlobalDecl GD) {
3583 return getFunctionFwdDeclOrStub(GD, /* Stub = */ false);
3584}
3585
3586llvm::DISubprogram *CGDebugInfo::getFunctionStub(GlobalDecl GD) {
3587 return getFunctionFwdDeclOrStub(GD, /* Stub = */ true);
3588}
3589
3590llvm::DIGlobalVariable *
3591CGDebugInfo::getGlobalVariableForwardDeclaration(const VarDecl *VD) {
3592 QualType T;
3593 StringRef Name, LinkageName;
3594 SourceLocation Loc = VD->getLocation();
3595 llvm::DIFile *Unit = getOrCreateFile(Loc);
3596 llvm::DIScope *DContext = Unit;
3597 unsigned Line = getLineNumber(Loc);
3598 llvm::MDTuple *TemplateParameters = nullptr;
3599
3600 collectVarDeclProps(VD, Unit, Line, T, Name, LinkageName, TemplateParameters,
3601 DContext);
3602 auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
3603 auto *GV = DBuilder.createTempGlobalVariableFwdDecl(
3604 DContext, Name, LinkageName, Unit, Line, getOrCreateType(T, Unit),
3605 !VD->isExternallyVisible(), nullptr, TemplateParameters, Align);
3606 FwdDeclReplaceMap.emplace_back(
3607 std::piecewise_construct,
3608 std::make_tuple(cast<VarDecl>(VD->getCanonicalDecl())),
3609 std::make_tuple(static_cast<llvm::Metadata *>(GV)));
3610 return GV;
3611}
3612
3613llvm::DINode *CGDebugInfo::getDeclarationOrDefinition(const Decl *D) {
3614 // We only need a declaration (not a definition) of the type - so use whatever
3615 // we would otherwise do to get a type for a pointee. (forward declarations in
3616 // limited debug info, full definitions (if the type definition is available)
3617 // in unlimited debug info)
3618 if (const auto *TD = dyn_cast<TypeDecl>(D))
3619 return getOrCreateType(CGM.getContext().getTypeDeclType(TD),
3620 getOrCreateFile(TD->getLocation()));
3621 auto I = DeclCache.find(D->getCanonicalDecl());
3622
3623 if (I != DeclCache.end()) {
3624 auto N = I->second;
3625 if (auto *GVE = dyn_cast_or_null<llvm::DIGlobalVariableExpression>(N))
3626 return GVE->getVariable();
3627 return dyn_cast_or_null<llvm::DINode>(N);
3628 }
3629
3630 // No definition for now. Emit a forward definition that might be
3631 // merged with a potential upcoming definition.
3632 if (const auto *FD = dyn_cast<FunctionDecl>(D))
3633 return getFunctionForwardDeclaration(FD);
3634 else if (const auto *VD = dyn_cast<VarDecl>(D))
3635 return getGlobalVariableForwardDeclaration(VD);
3636
3637 return nullptr;
3638}
3639
3640llvm::DISubprogram *CGDebugInfo::getFunctionDeclaration(const Decl *D) {
3641 if (!D || DebugKind <= codegenoptions::DebugLineTablesOnly)
3642 return nullptr;
3643
3644 const auto *FD = dyn_cast<FunctionDecl>(D);
3645 if (!FD)
3646 return nullptr;
3647
3648 // Setup context.
3649 auto *S = getDeclContextDescriptor(D);
3650
3651 auto MI = SPCache.find(FD->getCanonicalDecl());
3652 if (MI == SPCache.end()) {
3653 if (const auto *MD = dyn_cast<CXXMethodDecl>(FD->getCanonicalDecl())) {
3654 return CreateCXXMemberFunction(MD, getOrCreateFile(MD->getLocation()),
3655 cast<llvm::DICompositeType>(S));
3656 }
3657 }
3658 if (MI != SPCache.end()) {
3659 auto *SP = dyn_cast_or_null<llvm::DISubprogram>(MI->second);
3660 if (SP && !SP->isDefinition())
3661 return SP;
3662 }
3663
3664 for (auto NextFD : FD->redecls()) {
3665 auto MI = SPCache.find(NextFD->getCanonicalDecl());
3666 if (MI != SPCache.end()) {
3667 auto *SP = dyn_cast_or_null<llvm::DISubprogram>(MI->second);
3668 if (SP && !SP->isDefinition())
3669 return SP;
3670 }
3671 }
3672 return nullptr;
3673}
3674
3675llvm::DISubprogram *CGDebugInfo::getObjCMethodDeclaration(
3676 const Decl *D, llvm::DISubroutineType *FnType, unsigned LineNo,
3677 llvm::DINode::DIFlags Flags, llvm::DISubprogram::DISPFlags SPFlags) {
3678 if (!D || DebugKind <= codegenoptions::DebugLineTablesOnly)
3679 return nullptr;
3680
3681 const auto *OMD = dyn_cast<ObjCMethodDecl>(D);
3682 if (!OMD)
3683 return nullptr;
3684
3685 if (CGM.getCodeGenOpts().DwarfVersion < 5 && !OMD->isDirectMethod())
3686 return nullptr;
3687
3688 if (OMD->isDirectMethod())
3689 SPFlags |= llvm::DISubprogram::SPFlagObjCDirect;
3690
3691 // Starting with DWARF V5 method declarations are emitted as children of
3692 // the interface type.
3693 auto *ID = dyn_cast_or_null<ObjCInterfaceDecl>(D->getDeclContext());
3694 if (!ID)
3695 ID = OMD->getClassInterface();
3696 if (!ID)
3697 return nullptr;
3698 QualType QTy(ID->getTypeForDecl(), 0);
3699 auto It = TypeCache.find(QTy.getAsOpaquePtr());
3700 if (It == TypeCache.end())
3701 return nullptr;
3702 auto *InterfaceType = cast<llvm::DICompositeType>(It->second);
3703 llvm::DISubprogram *FD = DBuilder.createFunction(
3704 InterfaceType, getObjCMethodName(OMD), StringRef(),
3705 InterfaceType->getFile(), LineNo, FnType, LineNo, Flags, SPFlags);
3706 DBuilder.finalizeSubprogram(FD);
3707 ObjCMethodCache[ID].push_back({FD, OMD->isDirectMethod()});
3708 return FD;
3709}
3710
3711// getOrCreateFunctionType - Construct type. If it is a c++ method, include
3712// implicit parameter "this".
3713llvm::DISubroutineType *CGDebugInfo::getOrCreateFunctionType(const Decl *D,
3714 QualType FnType,
3715 llvm::DIFile *F) {
3716 if (!D || DebugKind <= codegenoptions::DebugLineTablesOnly)
3717 // Create fake but valid subroutine type. Otherwise -verify would fail, and
3718 // subprogram DIE will miss DW_AT_decl_file and DW_AT_decl_line fields.
3719 return DBuilder.createSubroutineType(DBuilder.getOrCreateTypeArray(None));
3720
3721 if (const auto *Method = dyn_cast<CXXMethodDecl>(D))
3722 return getOrCreateMethodType(Method, F, false);
3723
3724 const auto *FTy = FnType->getAs<FunctionType>();
3725 CallingConv CC = FTy ? FTy->getCallConv() : CallingConv::CC_C;
3726
3727 if (const auto *OMethod = dyn_cast<ObjCMethodDecl>(D)) {
3728 // Add "self" and "_cmd"
3729 SmallVector<llvm::Metadata *, 16> Elts;
3730
3731 // First element is always return type. For 'void' functions it is NULL.
3732 QualType ResultTy = OMethod->getReturnType();
3733
3734 // Replace the instancetype keyword with the actual type.
3735 if (ResultTy == CGM.getContext().getObjCInstanceType())
3736 ResultTy = CGM.getContext().getPointerType(
3737 QualType(OMethod->getClassInterface()->getTypeForDecl(), 0));
3738
3739 Elts.push_back(getOrCreateType(ResultTy, F));
3740 // "self" pointer is always first argument.
3741 QualType SelfDeclTy;
3742 if (auto *SelfDecl = OMethod->getSelfDecl())
3743 SelfDeclTy = SelfDecl->getType();
3744 else if (auto *FPT = dyn_cast<FunctionProtoType>(FnType))
3745 if (FPT->getNumParams() > 1)
3746 SelfDeclTy = FPT->getParamType(0);
3747 if (!SelfDeclTy.isNull())
3748 Elts.push_back(
3749 CreateSelfType(SelfDeclTy, getOrCreateType(SelfDeclTy, F)));
3750 // "_cmd" pointer is always second argument.
3751 Elts.push_back(DBuilder.createArtificialType(
3752 getOrCreateType(CGM.getContext().getObjCSelType(), F)));
3753 // Get rest of the arguments.
3754 for (const auto *PI : OMethod->parameters())
3755 Elts.push_back(getOrCreateType(PI->getType(), F));
3756 // Variadic methods need a special marker at the end of the type list.
3757 if (OMethod->isVariadic())
3758 Elts.push_back(DBuilder.createUnspecifiedParameter());
3759
3760 llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(Elts);
3761 return DBuilder.createSubroutineType(EltTypeArray, llvm::DINode::FlagZero,
3762 getDwarfCC(CC));
3763 }
3764
3765 // Handle variadic function types; they need an additional
3766 // unspecified parameter.
3767 if (const auto *FD = dyn_cast<FunctionDecl>(D))
3768 if (FD->isVariadic()) {
3769 SmallVector<llvm::Metadata *, 16> EltTys;
3770 EltTys.push_back(getOrCreateType(FD->getReturnType(), F));
3771 if (const auto *FPT = dyn_cast<FunctionProtoType>(FnType))
3772 for (QualType ParamType : FPT->param_types())
3773 EltTys.push_back(getOrCreateType(ParamType, F));
3774 EltTys.push_back(DBuilder.createUnspecifiedParameter());
3775 llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(EltTys);
3776 return DBuilder.createSubroutineType(EltTypeArray, llvm::DINode::FlagZero,
3777 getDwarfCC(CC));
3778 }
3779
3780 return cast<llvm::DISubroutineType>(getOrCreateType(FnType, F));
3781}
3782
3783void CGDebugInfo::EmitFunctionStart(GlobalDecl GD, SourceLocation Loc,
3784 SourceLocation ScopeLoc, QualType FnType,
3785 llvm::Function *Fn, bool CurFuncIsThunk,
3786 CGBuilderTy &Builder) {
3787
3788 StringRef Name;
3789 StringRef LinkageName;
3790
3791 FnBeginRegionCount.push_back(LexicalBlockStack.size());
3792
3793 const Decl *D = GD.getDecl();
3794 bool HasDecl = (D != nullptr);
3795
3796 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
3797 llvm::DISubprogram::DISPFlags SPFlags = llvm::DISubprogram::SPFlagZero;
3798 llvm::DIFile *Unit = getOrCreateFile(Loc);
3799 llvm::DIScope *FDContext = Unit;
3800 llvm::DINodeArray TParamsArray;
3801 if (!HasDecl) {
3802 // Use llvm function name.
3803 LinkageName = Fn->getName();
3804 } else if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
3805 // If there is a subprogram for this function available then use it.
3806 auto FI = SPCache.find(FD->getCanonicalDecl());
3807 if (FI != SPCache.end()) {
3808 auto *SP = dyn_cast_or_null<llvm::DISubprogram>(FI->second);
3809 if (SP && SP->isDefinition()) {
3810 LexicalBlockStack.emplace_back(SP);
3811 RegionMap[D].reset(SP);
3812 return;
3813 }
3814 }
3815 collectFunctionDeclProps(GD, Unit, Name, LinkageName, FDContext,
3816 TParamsArray, Flags);
3817 } else if (const auto *OMD = dyn_cast<ObjCMethodDecl>(D)) {
3818 Name = getObjCMethodName(OMD);
3819 Flags |= llvm::DINode::FlagPrototyped;
3820 } else if (isa<VarDecl>(D) &&
3821 GD.getDynamicInitKind() != DynamicInitKind::NoStub) {
3822 // This is a global initializer or atexit destructor for a global variable.
3823 Name = getDynamicInitializerName(cast<VarDecl>(D), GD.getDynamicInitKind(),
3824 Fn);
3825 } else {
3826 Name = Fn->getName();
3827
3828 if (isa<BlockDecl>(D))
3829 LinkageName = Name;
3830
3831 Flags |= llvm::DINode::FlagPrototyped;
3832 }
3833 if (Name.startswith("\01"))
3834 Name = Name.substr(1);
3835
3836 if (!HasDecl || D->isImplicit() || D->hasAttr<ArtificialAttr>() ||
3837 (isa<VarDecl>(D) && GD.getDynamicInitKind() != DynamicInitKind::NoStub)) {
3838 Flags |= llvm::DINode::FlagArtificial;
3839 // Artificial functions should not silently reuse CurLoc.
3840 CurLoc = SourceLocation();
3841 }
3842
3843 if (CurFuncIsThunk)
3844 Flags |= llvm::DINode::FlagThunk;
3845
3846 if (Fn->hasLocalLinkage())
3847 SPFlags |= llvm::DISubprogram::SPFlagLocalToUnit;
3848 if (CGM.getLangOpts().Optimize)
3849 SPFlags |= llvm::DISubprogram::SPFlagOptimized;
3850
3851 llvm::DINode::DIFlags FlagsForDef = Flags | getCallSiteRelatedAttrs();
3852 llvm::DISubprogram::DISPFlags SPFlagsForDef =
3853 SPFlags | llvm::DISubprogram::SPFlagDefinition;
3854
3855 unsigned LineNo = getLineNumber(Loc);
3856 unsigned ScopeLine = getLineNumber(ScopeLoc);
3857 llvm::DISubroutineType *DIFnType = getOrCreateFunctionType(D, FnType, Unit);
3858 llvm::DISubprogram *Decl = nullptr;
3859 if (D)
3860 Decl = isa<ObjCMethodDecl>(D)
3861 ? getObjCMethodDeclaration(D, DIFnType, LineNo, Flags, SPFlags)
3862 : getFunctionDeclaration(D);
3863
3864 // FIXME: The function declaration we're constructing here is mostly reusing
3865 // declarations from CXXMethodDecl and not constructing new ones for arbitrary
3866 // FunctionDecls. When/if we fix this we can have FDContext be TheCU/null for
3867 // all subprograms instead of the actual context since subprogram definitions
3868 // are emitted as CU level entities by the backend.
3869 llvm::DISubprogram *SP = DBuilder.createFunction(
3870 FDContext, Name, LinkageName, Unit, LineNo, DIFnType, ScopeLine,
3871 FlagsForDef, SPFlagsForDef, TParamsArray.get(), Decl);
3872 Fn->setSubprogram(SP);
3873 // We might get here with a VarDecl in the case we're generating
3874 // code for the initialization of globals. Do not record these decls
3875 // as they will overwrite the actual VarDecl Decl in the cache.
3876 if (HasDecl && isa<FunctionDecl>(D))
3877 DeclCache[D->getCanonicalDecl()].reset(SP);
3878
3879 // Push the function onto the lexical block stack.
3880 LexicalBlockStack.emplace_back(SP);
3881
3882 if (HasDecl)
3883 RegionMap[D].reset(SP);
3884}
3885
3886void CGDebugInfo::EmitFunctionDecl(GlobalDecl GD, SourceLocation Loc,
3887 QualType FnType, llvm::Function *Fn) {
3888 StringRef Name;
3889 StringRef LinkageName;
3890
3891 const Decl *D = GD.getDecl();
3892 if (!D)
3893 return;
3894
3895 llvm::TimeTraceScope TimeScope("DebugFunction", [&]() {
3896 std::string Name;
3897 llvm::raw_string_ostream OS(Name);
3898 if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
3899 ND->getNameForDiagnostic(OS, getPrintingPolicy(),
3900 /*Qualified=*/true);
3901 return Name;
3902 });
3903
3904 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
3905 llvm::DIFile *Unit = getOrCreateFile(Loc);
3906 bool IsDeclForCallSite = Fn ? true : false;
3907 llvm::DIScope *FDContext =
3908 IsDeclForCallSite ? Unit : getDeclContextDescriptor(D);
3909 llvm::DINodeArray TParamsArray;
3910 if (isa<FunctionDecl>(D)) {
3911 // If there is a DISubprogram for this function available then use it.
3912 collectFunctionDeclProps(GD, Unit, Name, LinkageName, FDContext,
3913 TParamsArray, Flags);
3914 } else if (const auto *OMD = dyn_cast<ObjCMethodDecl>(D)) {
3915 Name = getObjCMethodName(OMD);
3916 Flags |= llvm::DINode::FlagPrototyped;
3917 } else {
3918 llvm_unreachable("not a function or ObjC method")::llvm::llvm_unreachable_internal("not a function or ObjC method"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3918)
;
3919 }
3920 if (!Name.empty() && Name[0] == '\01')
3921 Name = Name.substr(1);
3922
3923 if (D->isImplicit()) {
3924 Flags |= llvm::DINode::FlagArtificial;
3925 // Artificial functions without a location should not silently reuse CurLoc.
3926 if (Loc.isInvalid())
3927 CurLoc = SourceLocation();
3928 }
3929 unsigned LineNo = getLineNumber(Loc);
3930 unsigned ScopeLine = 0;
3931 llvm::DISubprogram::DISPFlags SPFlags = llvm::DISubprogram::SPFlagZero;
3932 if (CGM.getLangOpts().Optimize)
3933 SPFlags |= llvm::DISubprogram::SPFlagOptimized;
3934
3935 llvm::DISubprogram *SP = DBuilder.createFunction(
3936 FDContext, Name, LinkageName, Unit, LineNo,
3937 getOrCreateFunctionType(D, FnType, Unit), ScopeLine, Flags, SPFlags,
3938 TParamsArray.get(), getFunctionDeclaration(D));
3939
3940 if (IsDeclForCallSite)
3941 Fn->setSubprogram(SP);
3942
3943 DBuilder.finalizeSubprogram(SP);
3944}
3945
3946void CGDebugInfo::EmitFuncDeclForCallSite(llvm::CallBase *CallOrInvoke,
3947 QualType CalleeType,
3948 const FunctionDecl *CalleeDecl) {
3949 if (!CallOrInvoke)
3950 return;
3951 auto *Func = CallOrInvoke->getCalledFunction();
3952 if (!Func)
3953 return;
3954 if (Func->getSubprogram())
3955 return;
3956
3957 // Do not emit a declaration subprogram for a builtin, a function with nodebug
3958 // attribute, or if call site info isn't required. Also, elide declarations
3959 // for functions with reserved names, as call site-related features aren't
3960 // interesting in this case (& also, the compiler may emit calls to these
3961 // functions without debug locations, which makes the verifier complain).
3962 if (CalleeDecl->getBuiltinID() != 0 || CalleeDecl->hasAttr<NoDebugAttr>() ||
3963 getCallSiteRelatedAttrs() == llvm::DINode::FlagZero)
3964 return;
3965 if (const auto *Id = CalleeDecl->getIdentifier())
3966 if (Id->isReservedName())
3967 return;
3968
3969 // If there is no DISubprogram attached to the function being called,
3970 // create the one describing the function in order to have complete
3971 // call site debug info.
3972 if (!CalleeDecl->isStatic() && !CalleeDecl->isInlined())
3973 EmitFunctionDecl(CalleeDecl, CalleeDecl->getLocation(), CalleeType, Func);
3974}
3975
3976void CGDebugInfo::EmitInlineFunctionStart(CGBuilderTy &Builder, GlobalDecl GD) {
3977 const auto *FD = cast<FunctionDecl>(GD.getDecl());
3978 // If there is a subprogram for this function available then use it.
3979 auto FI = SPCache.find(FD->getCanonicalDecl());
3980 llvm::DISubprogram *SP = nullptr;
3981 if (FI != SPCache.end())
3982 SP = dyn_cast_or_null<llvm::DISubprogram>(FI->second);
3983 if (!SP || !SP->isDefinition())
3984 SP = getFunctionStub(GD);
3985 FnBeginRegionCount.push_back(LexicalBlockStack.size());
3986 LexicalBlockStack.emplace_back(SP);
3987 setInlinedAt(Builder.getCurrentDebugLocation());
3988 EmitLocation(Builder, FD->getLocation());
3989}
3990
3991void CGDebugInfo::EmitInlineFunctionEnd(CGBuilderTy &Builder) {
3992 assert(CurInlinedAt && "unbalanced inline scope stack")((CurInlinedAt && "unbalanced inline scope stack") ? static_cast
<void> (0) : __assert_fail ("CurInlinedAt && \"unbalanced inline scope stack\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 3992, __PRETTY_FUNCTION__))
;
3993 EmitFunctionEnd(Builder, nullptr);
3994 setInlinedAt(llvm::DebugLoc(CurInlinedAt).getInlinedAt());
3995}
3996
3997void CGDebugInfo::EmitLocation(CGBuilderTy &Builder, SourceLocation Loc) {
3998 // Update our current location
3999 setLocation(Loc);
4000
4001 if (CurLoc.isInvalid() || CurLoc.isMacroID() || LexicalBlockStack.empty())
4002 return;
4003
4004 llvm::MDNode *Scope = LexicalBlockStack.back();
4005 Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(
4006 getLineNumber(CurLoc), getColumnNumber(CurLoc), Scope, CurInlinedAt));
4007}
4008
4009void CGDebugInfo::CreateLexicalBlock(SourceLocation Loc) {
4010 llvm::MDNode *Back = nullptr;
4011 if (!LexicalBlockStack.empty())
4012 Back = LexicalBlockStack.back().get();
4013 LexicalBlockStack.emplace_back(DBuilder.createLexicalBlock(
4014 cast<llvm::DIScope>(Back), getOrCreateFile(CurLoc), getLineNumber(CurLoc),
4015 getColumnNumber(CurLoc)));
4016}
4017
4018void CGDebugInfo::AppendAddressSpaceXDeref(
4019 unsigned AddressSpace, SmallVectorImpl<int64_t> &Expr) const {
4020 Optional<unsigned> DWARFAddressSpace =
4021 CGM.getTarget().getDWARFAddressSpace(AddressSpace);
4022 if (!DWARFAddressSpace)
4023 return;
4024
4025 Expr.push_back(llvm::dwarf::DW_OP_constu);
4026 Expr.push_back(DWARFAddressSpace.getValue());
4027 Expr.push_back(llvm::dwarf::DW_OP_swap);
4028 Expr.push_back(llvm::dwarf::DW_OP_xderef);
4029}
4030
4031void CGDebugInfo::EmitLexicalBlockStart(CGBuilderTy &Builder,
4032 SourceLocation Loc) {
4033 // Set our current location.
4034 setLocation(Loc);
4035
4036 // Emit a line table change for the current location inside the new scope.
4037 Builder.SetCurrentDebugLocation(
4038 llvm::DebugLoc::get(getLineNumber(Loc), getColumnNumber(Loc),
4039 LexicalBlockStack.back(), CurInlinedAt));
4040
4041 if (DebugKind <= codegenoptions::DebugLineTablesOnly)
4042 return;
4043
4044 // Create a new lexical block and push it on the stack.
4045 CreateLexicalBlock(Loc);
4046}
4047
4048void CGDebugInfo::EmitLexicalBlockEnd(CGBuilderTy &Builder,
4049 SourceLocation Loc) {
4050 assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!")((!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!"
) ? static_cast<void> (0) : __assert_fail ("!LexicalBlockStack.empty() && \"Region stack mismatch, stack empty!\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4050, __PRETTY_FUNCTION__))
;
4051
4052 // Provide an entry in the line table for the end of the block.
4053 EmitLocation(Builder, Loc);
4054
4055 if (DebugKind <= codegenoptions::DebugLineTablesOnly)
4056 return;
4057
4058 LexicalBlockStack.pop_back();
4059}
4060
4061void CGDebugInfo::EmitFunctionEnd(CGBuilderTy &Builder, llvm::Function *Fn) {
4062 assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!")((!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!"
) ? static_cast<void> (0) : __assert_fail ("!LexicalBlockStack.empty() && \"Region stack mismatch, stack empty!\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4062, __PRETTY_FUNCTION__))
;
4063 unsigned RCount = FnBeginRegionCount.back();
4064 assert(RCount <= LexicalBlockStack.size() && "Region stack mismatch")((RCount <= LexicalBlockStack.size() && "Region stack mismatch"
) ? static_cast<void> (0) : __assert_fail ("RCount <= LexicalBlockStack.size() && \"Region stack mismatch\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4064, __PRETTY_FUNCTION__))
;
4065
4066 // Pop all regions for this function.
4067 while (LexicalBlockStack.size() != RCount) {
4068 // Provide an entry in the line table for the end of the block.
4069 EmitLocation(Builder, CurLoc);
4070 LexicalBlockStack.pop_back();
4071 }
4072 FnBeginRegionCount.pop_back();
4073
4074 if (Fn && Fn->getSubprogram())
4075 DBuilder.finalizeSubprogram(Fn->getSubprogram());
4076}
4077
4078CGDebugInfo::BlockByRefType
4079CGDebugInfo::EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
4080 uint64_t *XOffset) {
4081 SmallVector<llvm::Metadata *, 5> EltTys;
4082 QualType FType;
4083 uint64_t FieldSize, FieldOffset;
4084 uint32_t FieldAlign;
4085
4086 llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
4087 QualType Type = VD->getType();
4088
4089 FieldOffset = 0;
4090 FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
4091 EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
4092 EltTys.push_back(CreateMemberType(Unit, FType, "__forwarding", &FieldOffset));
4093 FType = CGM.getContext().IntTy;
4094 EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
4095 EltTys.push_back(CreateMemberType(Unit, FType, "__size", &FieldOffset));
4096
4097 bool HasCopyAndDispose = CGM.getContext().BlockRequiresCopying(Type, VD);
4098 if (HasCopyAndDispose) {
4099 FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
4100 EltTys.push_back(
4101 CreateMemberType(Unit, FType, "__copy_helper", &FieldOffset));
4102 EltTys.push_back(
4103 CreateMemberType(Unit, FType, "__destroy_helper", &FieldOffset));
4104 }
4105 bool HasByrefExtendedLayout;
4106 Qualifiers::ObjCLifetime Lifetime;
4107 if (CGM.getContext().getByrefLifetime(Type, Lifetime,
4108 HasByrefExtendedLayout) &&
4109 HasByrefExtendedLayout) {
4110 FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
4111 EltTys.push_back(
4112 CreateMemberType(Unit, FType, "__byref_variable_layout", &FieldOffset));
4113 }
4114
4115 CharUnits Align = CGM.getContext().getDeclAlign(VD);
4116 if (Align > CGM.getContext().toCharUnitsFromBits(
4117 CGM.getTarget().getPointerAlign(0))) {
4118 CharUnits FieldOffsetInBytes =
4119 CGM.getContext().toCharUnitsFromBits(FieldOffset);
4120 CharUnits AlignedOffsetInBytes = FieldOffsetInBytes.alignTo(Align);
4121 CharUnits NumPaddingBytes = AlignedOffsetInBytes - FieldOffsetInBytes;
4122
4123 if (NumPaddingBytes.isPositive()) {
4124 llvm::APInt pad(32, NumPaddingBytes.getQuantity());
4125 FType = CGM.getContext().getConstantArrayType(
4126 CGM.getContext().CharTy, pad, nullptr, ArrayType::Normal, 0);
4127 EltTys.push_back(CreateMemberType(Unit, FType, "", &FieldOffset));
4128 }
4129 }
4130
4131 FType = Type;
4132 llvm::DIType *WrappedTy = getOrCreateType(FType, Unit);
4133 FieldSize = CGM.getContext().getTypeSize(FType);
4134 FieldAlign = CGM.getContext().toBits(Align);
4135
4136 *XOffset = FieldOffset;
4137 llvm::DIType *FieldTy = DBuilder.createMemberType(
4138 Unit, VD->getName(), Unit, 0, FieldSize, FieldAlign, FieldOffset,
4139 llvm::DINode::FlagZero, WrappedTy);
4140 EltTys.push_back(FieldTy);
4141 FieldOffset += FieldSize;
4142
4143 llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
4144 return {DBuilder.createStructType(Unit, "", Unit, 0, FieldOffset, 0,
4145 llvm::DINode::FlagZero, nullptr, Elements),
4146 WrappedTy};
4147}
4148
4149llvm::DILocalVariable *CGDebugInfo::EmitDeclare(const VarDecl *VD,
4150 llvm::Value *Storage,
4151 llvm::Optional<unsigned> ArgNo,
4152 CGBuilderTy &Builder,
4153 const bool UsePointerValue) {
4154 assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((CGM.getCodeGenOpts().hasReducedDebugInfo()) ? static_cast<
void> (0) : __assert_fail ("CGM.getCodeGenOpts().hasReducedDebugInfo()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4154, __PRETTY_FUNCTION__))
;
4155 assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!")((!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!"
) ? static_cast<void> (0) : __assert_fail ("!LexicalBlockStack.empty() && \"Region stack mismatch, stack empty!\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4155, __PRETTY_FUNCTION__))
;
4156 if (VD->hasAttr<NoDebugAttr>())
4157 return nullptr;
4158
4159 bool Unwritten =
4160 VD->isImplicit() || (isa<Decl>(VD->getDeclContext()) &&
4161 cast<Decl>(VD->getDeclContext())->isImplicit());
4162 llvm::DIFile *Unit = nullptr;
4163 if (!Unwritten)
4164 Unit = getOrCreateFile(VD->getLocation());
4165 llvm::DIType *Ty;
4166 uint64_t XOffset = 0;
4167 if (VD->hasAttr<BlocksAttr>())
4168 Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset).WrappedType;
4169 else
4170 Ty = getOrCreateType(VD->getType(), Unit);
4171
4172 // If there is no debug info for this type then do not emit debug info
4173 // for this variable.
4174 if (!Ty)
4175 return nullptr;
4176
4177 // Get location information.
4178 unsigned Line = 0;
4179 unsigned Column = 0;
4180 if (!Unwritten) {
4181 Line = getLineNumber(VD->getLocation());
4182 Column = getColumnNumber(VD->getLocation());
4183 }
4184 SmallVector<int64_t, 13> Expr;
4185 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
4186 if (VD->isImplicit())
4187 Flags |= llvm::DINode::FlagArtificial;
4188
4189 auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
4190
4191 unsigned AddressSpace = CGM.getContext().getTargetAddressSpace(VD->getType());
4192 AppendAddressSpaceXDeref(AddressSpace, Expr);
4193
4194 // If this is implicit parameter of CXXThis or ObjCSelf kind, then give it an
4195 // object pointer flag.
4196 if (const auto *IPD = dyn_cast<ImplicitParamDecl>(VD)) {
4197 if (IPD->getParameterKind() == ImplicitParamDecl::CXXThis ||
4198 IPD->getParameterKind() == ImplicitParamDecl::ObjCSelf)
4199 Flags |= llvm::DINode::FlagObjectPointer;
4200 }
4201
4202 // Note: Older versions of clang used to emit byval references with an extra
4203 // DW_OP_deref, because they referenced the IR arg directly instead of
4204 // referencing an alloca. Newer versions of LLVM don't treat allocas
4205 // differently from other function arguments when used in a dbg.declare.
4206 auto *Scope = cast<llvm::DIScope>(LexicalBlockStack.back());
4207 StringRef Name = VD->getName();
4208 if (!Name.empty()) {
4209 if (VD->hasAttr<BlocksAttr>()) {
4210 // Here, we need an offset *into* the alloca.
4211 CharUnits offset = CharUnits::fromQuantity(32);
4212 Expr.push_back(llvm::dwarf::DW_OP_plus_uconst);
4213 // offset of __forwarding field
4214 offset = CGM.getContext().toCharUnitsFromBits(
4215 CGM.getTarget().getPointerWidth(0));
4216 Expr.push_back(offset.getQuantity());
4217 Expr.push_back(llvm::dwarf::DW_OP_deref);
4218 Expr.push_back(llvm::dwarf::DW_OP_plus_uconst);
4219 // offset of x field
4220 offset = CGM.getContext().toCharUnitsFromBits(XOffset);
4221 Expr.push_back(offset.getQuantity());
4222 }
4223 } else if (const auto *RT = dyn_cast<RecordType>(VD->getType())) {
4224 // If VD is an anonymous union then Storage represents value for
4225 // all union fields.
4226 const RecordDecl *RD = RT->getDecl();
4227 if (RD->isUnion() && RD->isAnonymousStructOrUnion()) {
4228 // GDB has trouble finding local variables in anonymous unions, so we emit
4229 // artificial local variables for each of the members.
4230 //
4231 // FIXME: Remove this code as soon as GDB supports this.
4232 // The debug info verifier in LLVM operates based on the assumption that a
4233 // variable has the same size as its storage and we had to disable the
4234 // check for artificial variables.
4235 for (const auto *Field : RD->fields()) {
4236 llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
4237 StringRef FieldName = Field->getName();
4238
4239 // Ignore unnamed fields. Do not ignore unnamed records.
4240 if (FieldName.empty() && !isa<RecordType>(Field->getType()))
4241 continue;
4242
4243 // Use VarDecl's Tag, Scope and Line number.
4244 auto FieldAlign = getDeclAlignIfRequired(Field, CGM.getContext());
4245 auto *D = DBuilder.createAutoVariable(
4246 Scope, FieldName, Unit, Line, FieldTy, CGM.getLangOpts().Optimize,
4247 Flags | llvm::DINode::FlagArtificial, FieldAlign);
4248
4249 // Insert an llvm.dbg.declare into the current block.
4250 DBuilder.insertDeclare(
4251 Storage, D, DBuilder.createExpression(Expr),
4252 llvm::DebugLoc::get(Line, Column, Scope, CurInlinedAt),
4253 Builder.GetInsertBlock());
4254 }
4255 }
4256 }
4257
4258 // Clang stores the sret pointer provided by the caller in a static alloca.
4259 // Use DW_OP_deref to tell the debugger to load the pointer and treat it as
4260 // the address of the variable.
4261 if (UsePointerValue) {
4262 assert(std::find(Expr.begin(), Expr.end(), llvm::dwarf::DW_OP_deref) ==((std::find(Expr.begin(), Expr.end(), llvm::dwarf::DW_OP_deref
) == Expr.end() && "Debug info already contains DW_OP_deref."
) ? static_cast<void> (0) : __assert_fail ("std::find(Expr.begin(), Expr.end(), llvm::dwarf::DW_OP_deref) == Expr.end() && \"Debug info already contains DW_OP_deref.\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4264, __PRETTY_FUNCTION__))
4263 Expr.end() &&((std::find(Expr.begin(), Expr.end(), llvm::dwarf::DW_OP_deref
) == Expr.end() && "Debug info already contains DW_OP_deref."
) ? static_cast<void> (0) : __assert_fail ("std::find(Expr.begin(), Expr.end(), llvm::dwarf::DW_OP_deref) == Expr.end() && \"Debug info already contains DW_OP_deref.\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4264, __PRETTY_FUNCTION__))
4264 "Debug info already contains DW_OP_deref.")((std::find(Expr.begin(), Expr.end(), llvm::dwarf::DW_OP_deref
) == Expr.end() && "Debug info already contains DW_OP_deref."
) ? static_cast<void> (0) : __assert_fail ("std::find(Expr.begin(), Expr.end(), llvm::dwarf::DW_OP_deref) == Expr.end() && \"Debug info already contains DW_OP_deref.\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4264, __PRETTY_FUNCTION__))
;
4265 Expr.push_back(llvm::dwarf::DW_OP_deref);
4266 }
4267
4268 // Create the descriptor for the variable.
4269 auto *D = ArgNo ? DBuilder.createParameterVariable(
4270 Scope, Name, *ArgNo, Unit, Line, Ty,
4271 CGM.getLangOpts().Optimize, Flags)
4272 : DBuilder.createAutoVariable(Scope, Name, Unit, Line, Ty,
4273 CGM.getLangOpts().Optimize,
4274 Flags, Align);
4275
4276 // Insert an llvm.dbg.declare into the current block.
4277 DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(Expr),
4278 llvm::DebugLoc::get(Line, Column, Scope, CurInlinedAt),
4279 Builder.GetInsertBlock());
4280
4281 return D;
4282}
4283
4284llvm::DILocalVariable *
4285CGDebugInfo::EmitDeclareOfAutoVariable(const VarDecl *VD, llvm::Value *Storage,
4286 CGBuilderTy &Builder,
4287 const bool UsePointerValue) {
4288 assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((CGM.getCodeGenOpts().hasReducedDebugInfo()) ? static_cast<
void> (0) : __assert_fail ("CGM.getCodeGenOpts().hasReducedDebugInfo()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4288, __PRETTY_FUNCTION__))
;
4289 return EmitDeclare(VD, Storage, llvm::None, Builder, UsePointerValue);
4290}
4291
4292void CGDebugInfo::EmitLabel(const LabelDecl *D, CGBuilderTy &Builder) {
4293 assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((CGM.getCodeGenOpts().hasReducedDebugInfo()) ? static_cast<
void> (0) : __assert_fail ("CGM.getCodeGenOpts().hasReducedDebugInfo()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4293, __PRETTY_FUNCTION__))
;
4294 assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!")((!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!"
) ? static_cast<void> (0) : __assert_fail ("!LexicalBlockStack.empty() && \"Region stack mismatch, stack empty!\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4294, __PRETTY_FUNCTION__))
;
4295
4296 if (D->hasAttr<NoDebugAttr>())
4297 return;
4298
4299 auto *Scope = cast<llvm::DIScope>(LexicalBlockStack.back());
4300 llvm::DIFile *Unit = getOrCreateFile(D->getLocation());
4301
4302 // Get location information.
4303 unsigned Line = getLineNumber(D->getLocation());
4304 unsigned Column = getColumnNumber(D->getLocation());
4305
4306 StringRef Name = D->getName();
4307
4308 // Create the descriptor for the label.
4309 auto *L =
4310 DBuilder.createLabel(Scope, Name, Unit, Line, CGM.getLangOpts().Optimize);
4311
4312 // Insert an llvm.dbg.label into the current block.
4313 DBuilder.insertLabel(L,
4314 llvm::DebugLoc::get(Line, Column, Scope, CurInlinedAt),
4315 Builder.GetInsertBlock());
4316}
4317
4318llvm::DIType *CGDebugInfo::CreateSelfType(const QualType &QualTy,
4319 llvm::DIType *Ty) {
4320 llvm::DIType *CachedTy = getTypeOrNull(QualTy);
4321 if (CachedTy)
4322 Ty = CachedTy;
4323 return DBuilder.createObjectPointerType(Ty);
4324}
4325
4326void CGDebugInfo::EmitDeclareOfBlockDeclRefVariable(
4327 const VarDecl *VD, llvm::Value *Storage, CGBuilderTy &Builder,
4328 const CGBlockInfo &blockInfo, llvm::Instruction *InsertPoint) {
4329 assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((CGM.getCodeGenOpts().hasReducedDebugInfo()) ? static_cast<
void> (0) : __assert_fail ("CGM.getCodeGenOpts().hasReducedDebugInfo()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4329, __PRETTY_FUNCTION__))
;
4330 assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!")((!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!"
) ? static_cast<void> (0) : __assert_fail ("!LexicalBlockStack.empty() && \"Region stack mismatch, stack empty!\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4330, __PRETTY_FUNCTION__))
;
4331
4332 if (Builder.GetInsertBlock() == nullptr)
4333 return;
4334 if (VD->hasAttr<NoDebugAttr>())
4335 return;
4336
4337 bool isByRef = VD->hasAttr<BlocksAttr>();
4338
4339 uint64_t XOffset = 0;
4340 llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
4341 llvm::DIType *Ty;
4342 if (isByRef)
4343 Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset).WrappedType;
4344 else
4345 Ty = getOrCreateType(VD->getType(), Unit);
4346
4347 // Self is passed along as an implicit non-arg variable in a
4348 // block. Mark it as the object pointer.
4349 if (const auto *IPD = dyn_cast<ImplicitParamDecl>(VD))
4350 if (IPD->getParameterKind() == ImplicitParamDecl::ObjCSelf)
4351 Ty = CreateSelfType(VD->getType(), Ty);
4352
4353 // Get location information.
4354 unsigned Line = getLineNumber(VD->getLocation());
4355 unsigned Column = getColumnNumber(VD->getLocation());
4356
4357 const llvm::DataLayout &target = CGM.getDataLayout();
4358
4359 CharUnits offset = CharUnits::fromQuantity(
4360 target.getStructLayout(blockInfo.StructureType)
4361 ->getElementOffset(blockInfo.getCapture(VD).getIndex()));
4362
4363 SmallVector<int64_t, 9> addr;
4364 addr.push_back(llvm::dwarf::DW_OP_deref);
4365 addr.push_back(llvm::dwarf::DW_OP_plus_uconst);
4366 addr.push_back(offset.getQuantity());
4367 if (isByRef) {
4368 addr.push_back(llvm::dwarf::DW_OP_deref);
4369 addr.push_back(llvm::dwarf::DW_OP_plus_uconst);
4370 // offset of __forwarding field
4371 offset =
4372 CGM.getContext().toCharUnitsFromBits(target.getPointerSizeInBits(0));
4373 addr.push_back(offset.getQuantity());
4374 addr.push_back(llvm::dwarf::DW_OP_deref);
4375 addr.push_back(llvm::dwarf::DW_OP_plus_uconst);
4376 // offset of x field
4377 offset = CGM.getContext().toCharUnitsFromBits(XOffset);
4378 addr.push_back(offset.getQuantity());
4379 }
4380
4381 // Create the descriptor for the variable.
4382 auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
4383 auto *D = DBuilder.createAutoVariable(
4384 cast<llvm::DILocalScope>(LexicalBlockStack.back()), VD->getName(), Unit,
4385 Line, Ty, false, llvm::DINode::FlagZero, Align);
4386
4387 // Insert an llvm.dbg.declare into the current block.
4388 auto DL =
4389 llvm::DebugLoc::get(Line, Column, LexicalBlockStack.back(), CurInlinedAt);
4390 auto *Expr = DBuilder.createExpression(addr);
4391 if (InsertPoint)
4392 DBuilder.insertDeclare(Storage, D, Expr, DL, InsertPoint);
4393 else
4394 DBuilder.insertDeclare(Storage, D, Expr, DL, Builder.GetInsertBlock());
4395}
4396
4397void CGDebugInfo::EmitDeclareOfArgVariable(const VarDecl *VD, llvm::Value *AI,
4398 unsigned ArgNo,
4399 CGBuilderTy &Builder) {
4400 assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((CGM.getCodeGenOpts().hasReducedDebugInfo()) ? static_cast<
void> (0) : __assert_fail ("CGM.getCodeGenOpts().hasReducedDebugInfo()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4400, __PRETTY_FUNCTION__))
;
4401 EmitDeclare(VD, AI, ArgNo, Builder);
4402}
4403
4404namespace {
4405struct BlockLayoutChunk {
4406 uint64_t OffsetInBits;
4407 const BlockDecl::Capture *Capture;
4408};
4409bool operator<(const BlockLayoutChunk &l, const BlockLayoutChunk &r) {
4410 return l.OffsetInBits < r.OffsetInBits;
4411}
4412} // namespace
4413
4414void CGDebugInfo::collectDefaultFieldsForBlockLiteralDeclare(
4415 const CGBlockInfo &Block, const ASTContext &Context, SourceLocation Loc,
4416 const llvm::StructLayout &BlockLayout, llvm::DIFile *Unit,
4417 SmallVectorImpl<llvm::Metadata *> &Fields) {
4418 // Blocks in OpenCL have unique constraints which make the standard fields
4419 // redundant while requiring size and align fields for enqueue_kernel. See
4420 // initializeForBlockHeader in CGBlocks.cpp
4421 if (CGM.getLangOpts().OpenCL) {
4422 Fields.push_back(createFieldType("__size", Context.IntTy, Loc, AS_public,
4423 BlockLayout.getElementOffsetInBits(0),
4424 Unit, Unit));
4425 Fields.push_back(createFieldType("__align", Context.IntTy, Loc, AS_public,
4426 BlockLayout.getElementOffsetInBits(1),
4427 Unit, Unit));
4428 } else {
4429 Fields.push_back(createFieldType("__isa", Context.VoidPtrTy, Loc, AS_public,
4430 BlockLayout.getElementOffsetInBits(0),
4431 Unit, Unit));
4432 Fields.push_back(createFieldType("__flags", Context.IntTy, Loc, AS_public,
4433 BlockLayout.getElementOffsetInBits(1),
4434 Unit, Unit));
4435 Fields.push_back(
4436 createFieldType("__reserved", Context.IntTy, Loc, AS_public,
4437 BlockLayout.getElementOffsetInBits(2), Unit, Unit));
4438 auto *FnTy = Block.getBlockExpr()->getFunctionType();
4439 auto FnPtrType = CGM.getContext().getPointerType(FnTy->desugar());
4440 Fields.push_back(createFieldType("__FuncPtr", FnPtrType, Loc, AS_public,
4441 BlockLayout.getElementOffsetInBits(3),
4442 Unit, Unit));
4443 Fields.push_back(createFieldType(
4444 "__descriptor",
4445 Context.getPointerType(Block.NeedsCopyDispose
4446 ? Context.getBlockDescriptorExtendedType()
4447 : Context.getBlockDescriptorType()),
4448 Loc, AS_public, BlockLayout.getElementOffsetInBits(4), Unit, Unit));
4449 }
4450}
4451
4452void CGDebugInfo::EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
4453 StringRef Name,
4454 unsigned ArgNo,
4455 llvm::AllocaInst *Alloca,
4456 CGBuilderTy &Builder) {
4457 assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((CGM.getCodeGenOpts().hasReducedDebugInfo()) ? static_cast<
void> (0) : __assert_fail ("CGM.getCodeGenOpts().hasReducedDebugInfo()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4457, __PRETTY_FUNCTION__))
;
4458 ASTContext &C = CGM.getContext();
4459 const BlockDecl *blockDecl = block.getBlockDecl();
4460
4461 // Collect some general information about the block's location.
4462 SourceLocation loc = blockDecl->getCaretLocation();
4463 llvm::DIFile *tunit = getOrCreateFile(loc);
4464 unsigned line = getLineNumber(loc);
4465 unsigned column = getColumnNumber(loc);
4466
4467 // Build the debug-info type for the block literal.
4468 getDeclContextDescriptor(blockDecl);
4469
4470 const llvm::StructLayout *blockLayout =
4471 CGM.getDataLayout().getStructLayout(block.StructureType);
4472
4473 SmallVector<llvm::Metadata *, 16> fields;
4474 collectDefaultFieldsForBlockLiteralDeclare(block, C, loc, *blockLayout, tunit,
4475 fields);
4476
4477 // We want to sort the captures by offset, not because DWARF
4478 // requires this, but because we're paranoid about debuggers.
4479 SmallVector<BlockLayoutChunk, 8> chunks;
4480
4481 // 'this' capture.
4482 if (blockDecl->capturesCXXThis()) {
4483 BlockLayoutChunk chunk;
4484 chunk.OffsetInBits =
4485 blockLayout->getElementOffsetInBits(block.CXXThisIndex);
4486 chunk.Capture = nullptr;
4487 chunks.push_back(chunk);
4488 }
4489
4490 // Variable captures.
4491 for (const auto &capture : blockDecl->captures()) {
4492 const VarDecl *variable = capture.getVariable();
4493 const CGBlockInfo::Capture &captureInfo = block.getCapture(variable);
4494
4495 // Ignore constant captures.
4496 if (captureInfo.isConstant())
4497 continue;
4498
4499 BlockLayoutChunk chunk;
4500 chunk.OffsetInBits =
4501 blockLayout->getElementOffsetInBits(captureInfo.getIndex());
4502 chunk.Capture = &capture;
4503 chunks.push_back(chunk);
4504 }
4505
4506 // Sort by offset.
4507 llvm::array_pod_sort(chunks.begin(), chunks.end());
4508
4509 for (const BlockLayoutChunk &Chunk : chunks) {
4510 uint64_t offsetInBits = Chunk.OffsetInBits;
4511 const BlockDecl::Capture *capture = Chunk.Capture;
4512
4513 // If we have a null capture, this must be the C++ 'this' capture.
4514 if (!capture) {
4515 QualType type;
4516 if (auto *Method =
4517 cast_or_null<CXXMethodDecl>(blockDecl->getNonClosureContext()))
4518 type = Method->getThisType();
4519 else if (auto *RDecl = dyn_cast<CXXRecordDecl>(blockDecl->getParent()))
4520 type = QualType(RDecl->getTypeForDecl(), 0);
4521 else
4522 llvm_unreachable("unexpected block declcontext")::llvm::llvm_unreachable_internal("unexpected block declcontext"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4522)
;
4523
4524 fields.push_back(createFieldType("this", type, loc, AS_public,
4525 offsetInBits, tunit, tunit));
4526 continue;
4527 }
4528
4529 const VarDecl *variable = capture->getVariable();
4530 StringRef name = variable->getName();
4531
4532 llvm::DIType *fieldType;
4533 if (capture->isByRef()) {
4534 TypeInfo PtrInfo = C.getTypeInfo(C.VoidPtrTy);
4535 auto Align = PtrInfo.AlignIsRequired ? PtrInfo.Align : 0;
4536 // FIXME: This recomputes the layout of the BlockByRefWrapper.
4537 uint64_t xoffset;
4538 fieldType =
4539 EmitTypeForVarWithBlocksAttr(variable, &xoffset).BlockByRefWrapper;
4540 fieldType = DBuilder.createPointerType(fieldType, PtrInfo.Width);
4541 fieldType = DBuilder.createMemberType(tunit, name, tunit, line,
4542 PtrInfo.Width, Align, offsetInBits,
4543 llvm::DINode::FlagZero, fieldType);
4544 } else {
4545 auto Align = getDeclAlignIfRequired(variable, CGM.getContext());
4546 fieldType = createFieldType(name, variable->getType(), loc, AS_public,
4547 offsetInBits, Align, tunit, tunit);
4548 }
4549 fields.push_back(fieldType);
4550 }
4551
4552 SmallString<36> typeName;
4553 llvm::raw_svector_ostream(typeName)
4554 << "__block_literal_" << CGM.getUniqueBlockCount();
4555
4556 llvm::DINodeArray fieldsArray = DBuilder.getOrCreateArray(fields);
4557
4558 llvm::DIType *type =
4559 DBuilder.createStructType(tunit, typeName.str(), tunit, line,
4560 CGM.getContext().toBits(block.BlockSize), 0,
4561 llvm::DINode::FlagZero, nullptr, fieldsArray);
4562 type = DBuilder.createPointerType(type, CGM.PointerWidthInBits);
4563
4564 // Get overall information about the block.
4565 llvm::DINode::DIFlags flags = llvm::DINode::FlagArtificial;
4566 auto *scope = cast<llvm::DILocalScope>(LexicalBlockStack.back());
4567
4568 // Create the descriptor for the parameter.
4569 auto *debugVar = DBuilder.createParameterVariable(
4570 scope, Name, ArgNo, tunit, line, type, CGM.getLangOpts().Optimize, flags);
4571
4572 // Insert an llvm.dbg.declare into the current block.
4573 DBuilder.insertDeclare(Alloca, debugVar, DBuilder.createExpression(),
4574 llvm::DebugLoc::get(line, column, scope, CurInlinedAt),
4575 Builder.GetInsertBlock());
4576}
4577
4578llvm::DIDerivedType *
4579CGDebugInfo::getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D) {
4580 if (!D || !D->isStaticDataMember())
4581 return nullptr;
4582
4583 auto MI = StaticDataMemberCache.find(D->getCanonicalDecl());
4584 if (MI != StaticDataMemberCache.end()) {
4585 assert(MI->second && "Static data member declaration should still exist")((MI->second && "Static data member declaration should still exist"
) ? static_cast<void> (0) : __assert_fail ("MI->second && \"Static data member declaration should still exist\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4585, __PRETTY_FUNCTION__))
;
4586 return MI->second;
4587 }
4588
4589 // If the member wasn't found in the cache, lazily construct and add it to the
4590 // type (used when a limited form of the type is emitted).
4591 auto DC = D->getDeclContext();
4592 auto *Ctxt = cast<llvm::DICompositeType>(getDeclContextDescriptor(D));
4593 return CreateRecordStaticField(D, Ctxt, cast<RecordDecl>(DC));
4594}
4595
4596llvm::DIGlobalVariableExpression *CGDebugInfo::CollectAnonRecordDecls(
4597 const RecordDecl *RD, llvm::DIFile *Unit, unsigned LineNo,
4598 StringRef LinkageName, llvm::GlobalVariable *Var, llvm::DIScope *DContext) {
4599 llvm::DIGlobalVariableExpression *GVE = nullptr;
4600
4601 for (const auto *Field : RD->fields()) {
4602 llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
4603 StringRef FieldName = Field->getName();
4604
4605 // Ignore unnamed fields, but recurse into anonymous records.
4606 if (FieldName.empty()) {
4607 if (const auto *RT = dyn_cast<RecordType>(Field->getType()))
4608 GVE = CollectAnonRecordDecls(RT->getDecl(), Unit, LineNo, LinkageName,
4609 Var, DContext);
4610 continue;
4611 }
4612 // Use VarDecl's Tag, Scope and Line number.
4613 GVE = DBuilder.createGlobalVariableExpression(
4614 DContext, FieldName, LinkageName, Unit, LineNo, FieldTy,
4615 Var->hasLocalLinkage());
4616 Var->addDebugInfo(GVE);
4617 }
4618 return GVE;
4619}
4620
4621void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
4622 const VarDecl *D) {
4623 assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((CGM.getCodeGenOpts().hasReducedDebugInfo()) ? static_cast<
void> (0) : __assert_fail ("CGM.getCodeGenOpts().hasReducedDebugInfo()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4623, __PRETTY_FUNCTION__))
;
4624 if (D->hasAttr<NoDebugAttr>())
4625 return;
4626
4627 llvm::TimeTraceScope TimeScope("DebugGlobalVariable", [&]() {
4628 std::string Name;
4629 llvm::raw_string_ostream OS(Name);
4630 D->getNameForDiagnostic(OS, getPrintingPolicy(),
4631 /*Qualified=*/true);
4632 return Name;
4633 });
4634
4635 // If we already created a DIGlobalVariable for this declaration, just attach
4636 // it to the llvm::GlobalVariable.
4637 auto Cached = DeclCache.find(D->getCanonicalDecl());
4638 if (Cached != DeclCache.end())
4639 return Var->addDebugInfo(
4640 cast<llvm::DIGlobalVariableExpression>(Cached->second));
4641
4642 // Create global variable debug descriptor.
4643 llvm::DIFile *Unit = nullptr;
4644 llvm::DIScope *DContext = nullptr;
4645 unsigned LineNo;
4646 StringRef DeclName, LinkageName;
4647 QualType T;
4648 llvm::MDTuple *TemplateParameters = nullptr;
4649 collectVarDeclProps(D, Unit, LineNo, T, DeclName, LinkageName,
4650 TemplateParameters, DContext);
4651
4652 // Attempt to store one global variable for the declaration - even if we
4653 // emit a lot of fields.
4654 llvm::DIGlobalVariableExpression *GVE = nullptr;
4655
4656 // If this is an anonymous union then we'll want to emit a global
4657 // variable for each member of the anonymous union so that it's possible
4658 // to find the name of any field in the union.
4659 if (T->isUnionType() && DeclName.empty()) {
4660 const RecordDecl *RD = T->castAs<RecordType>()->getDecl();
4661 assert(RD->isAnonymousStructOrUnion() &&((RD->isAnonymousStructOrUnion() && "unnamed non-anonymous struct or union?"
) ? static_cast<void> (0) : __assert_fail ("RD->isAnonymousStructOrUnion() && \"unnamed non-anonymous struct or union?\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4662, __PRETTY_FUNCTION__))
4662 "unnamed non-anonymous struct or union?")((RD->isAnonymousStructOrUnion() && "unnamed non-anonymous struct or union?"
) ? static_cast<void> (0) : __assert_fail ("RD->isAnonymousStructOrUnion() && \"unnamed non-anonymous struct or union?\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4662, __PRETTY_FUNCTION__))
;
4663 GVE = CollectAnonRecordDecls(RD, Unit, LineNo, LinkageName, Var, DContext);
4664 } else {
4665 auto Align = getDeclAlignIfRequired(D, CGM.getContext());
4666
4667 SmallVector<int64_t, 4> Expr;
4668 unsigned AddressSpace =
4669 CGM.getContext().getTargetAddressSpace(D->getType());
4670 if (CGM.getLangOpts().CUDA && CGM.getLangOpts().CUDAIsDevice) {
4671 if (D->hasAttr<CUDASharedAttr>())
4672 AddressSpace =
4673 CGM.getContext().getTargetAddressSpace(LangAS::cuda_shared);
4674 else if (D->hasAttr<CUDAConstantAttr>())
4675 AddressSpace =
4676 CGM.getContext().getTargetAddressSpace(LangAS::cuda_constant);
4677 }
4678 AppendAddressSpaceXDeref(AddressSpace, Expr);
4679
4680 GVE = DBuilder.createGlobalVariableExpression(
4681 DContext, DeclName, LinkageName, Unit, LineNo, getOrCreateType(T, Unit),
4682 Var->hasLocalLinkage(), true,
4683 Expr.empty() ? nullptr : DBuilder.createExpression(Expr),
4684 getOrCreateStaticDataMemberDeclarationOrNull(D), TemplateParameters,
4685 Align);
4686 Var->addDebugInfo(GVE);
4687 }
4688 DeclCache[D->getCanonicalDecl()].reset(GVE);
4689}
4690
4691void CGDebugInfo::EmitGlobalVariable(const ValueDecl *VD, const APValue &Init) {
4692 assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((CGM.getCodeGenOpts().hasReducedDebugInfo()) ? static_cast<
void> (0) : __assert_fail ("CGM.getCodeGenOpts().hasReducedDebugInfo()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4692, __PRETTY_FUNCTION__))
;
4693 if (VD->hasAttr<NoDebugAttr>())
4694 return;
4695 llvm::TimeTraceScope TimeScope("DebugConstGlobalVariable", [&]() {
4696 std::string Name;
4697 llvm::raw_string_ostream OS(Name);
4698 VD->getNameForDiagnostic(OS, getPrintingPolicy(),
4699 /*Qualified=*/true);
4700 return Name;
4701 });
4702
4703 auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
4704 // Create the descriptor for the variable.
4705 llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
4706 StringRef Name = VD->getName();
4707 llvm::DIType *Ty = getOrCreateType(VD->getType(), Unit);
4708
4709 if (const auto *ECD = dyn_cast<EnumConstantDecl>(VD)) {
4710 const auto *ED = cast<EnumDecl>(ECD->getDeclContext());
4711 assert(isa<EnumType>(ED->getTypeForDecl()) && "Enum without EnumType?")((isa<EnumType>(ED->getTypeForDecl()) && "Enum without EnumType?"
) ? static_cast<void> (0) : __assert_fail ("isa<EnumType>(ED->getTypeForDecl()) && \"Enum without EnumType?\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4711, __PRETTY_FUNCTION__))
;
4712
4713 if (CGM.getCodeGenOpts().EmitCodeView) {
4714 // If CodeView, emit enums as global variables, unless they are defined
4715 // inside a class. We do this because MSVC doesn't emit S_CONSTANTs for
4716 // enums in classes, and because it is difficult to attach this scope
4717 // information to the global variable.
4718 if (isa<RecordDecl>(ED->getDeclContext()))
4719 return;
4720 } else {
4721 // If not CodeView, emit DW_TAG_enumeration_type if necessary. For
4722 // example: for "enum { ZERO };", a DW_TAG_enumeration_type is created the
4723 // first time `ZERO` is referenced in a function.
4724 llvm::DIType *EDTy =
4725 getOrCreateType(QualType(ED->getTypeForDecl(), 0), Unit);
4726 assert (EDTy->getTag() == llvm::dwarf::DW_TAG_enumeration_type)((EDTy->getTag() == llvm::dwarf::DW_TAG_enumeration_type) ?
static_cast<void> (0) : __assert_fail ("EDTy->getTag() == llvm::dwarf::DW_TAG_enumeration_type"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4726, __PRETTY_FUNCTION__))
;
4727 (void)EDTy;
4728 return;
4729 }
4730 }
4731
4732 llvm::DIScope *DContext = nullptr;
4733
4734 // Do not emit separate definitions for function local consts.
4735 if (isa<FunctionDecl>(VD->getDeclContext()))
4736 return;
4737
4738 // Emit definition for static members in CodeView.
4739 VD = cast<ValueDecl>(VD->getCanonicalDecl());
4740 auto *VarD = dyn_cast<VarDecl>(VD);
4741 if (VarD && VarD->isStaticDataMember()) {
4742 auto *RD = cast<RecordDecl>(VarD->getDeclContext());
4743 getDeclContextDescriptor(VarD);
4744 // Ensure that the type is retained even though it's otherwise unreferenced.
4745 //
4746 // FIXME: This is probably unnecessary, since Ty should reference RD
4747 // through its scope.
4748 RetainedTypes.push_back(
4749 CGM.getContext().getRecordType(RD).getAsOpaquePtr());
4750
4751 if (!CGM.getCodeGenOpts().EmitCodeView)
4752 return;
4753
4754 // Use the global scope for static members.
4755 DContext = getContextDescriptor(
4756 cast<Decl>(CGM.getContext().getTranslationUnitDecl()), TheCU);
4757 } else {
4758 DContext = getDeclContextDescriptor(VD);
4759 }
4760
4761 auto &GV = DeclCache[VD];
4762 if (GV)
4763 return;
4764 llvm::DIExpression *InitExpr = nullptr;
4765 if (CGM.getContext().getTypeSize(VD->getType()) <= 64) {
4766 // FIXME: Add a representation for integer constants wider than 64 bits.
4767 if (Init.isInt())
4768 InitExpr =
4769 DBuilder.createConstantValueExpression(Init.getInt().getExtValue());
4770 else if (Init.isFloat())
4771 InitExpr = DBuilder.createConstantValueExpression(
4772 Init.getFloat().bitcastToAPInt().getZExtValue());
4773 }
4774
4775 llvm::MDTuple *TemplateParameters = nullptr;
4776
4777 if (isa<VarTemplateSpecializationDecl>(VD))
4778 if (VarD) {
4779 llvm::DINodeArray parameterNodes = CollectVarTemplateParams(VarD, &*Unit);
4780 TemplateParameters = parameterNodes.get();
4781 }
4782
4783 GV.reset(DBuilder.createGlobalVariableExpression(
4784 DContext, Name, StringRef(), Unit, getLineNumber(VD->getLocation()), Ty,
4785 true, true, InitExpr, getOrCreateStaticDataMemberDeclarationOrNull(VarD),
4786 TemplateParameters, Align));
4787}
4788
4789void CGDebugInfo::EmitExternalVariable(llvm::GlobalVariable *Var,
4790 const VarDecl *D) {
4791 assert(CGM.getCodeGenOpts().hasReducedDebugInfo())((CGM.getCodeGenOpts().hasReducedDebugInfo()) ? static_cast<
void> (0) : __assert_fail ("CGM.getCodeGenOpts().hasReducedDebugInfo()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4791, __PRETTY_FUNCTION__))
;
4792 if (D->hasAttr<NoDebugAttr>())
4793 return;
4794
4795 auto Align = getDeclAlignIfRequired(D, CGM.getContext());
4796 llvm::DIFile *Unit = getOrCreateFile(D->getLocation());
4797 StringRef Name = D->getName();
4798 llvm::DIType *Ty = getOrCreateType(D->getType(), Unit);
4799
4800 llvm::DIScope *DContext = getDeclContextDescriptor(D);
4801 llvm::DIGlobalVariableExpression *GVE =
4802 DBuilder.createGlobalVariableExpression(
4803 DContext, Name, StringRef(), Unit, getLineNumber(D->getLocation()),
4804 Ty, false, false, nullptr, nullptr, nullptr, Align);
4805 Var->addDebugInfo(GVE);
4806}
4807
4808llvm::DIScope *CGDebugInfo::getCurrentContextDescriptor(const Decl *D) {
4809 if (!LexicalBlockStack.empty())
4810 return LexicalBlockStack.back();
4811 llvm::DIScope *Mod = getParentModuleOrNull(D);
4812 return getContextDescriptor(D, Mod ? Mod : TheCU);
4813}
4814
4815void CGDebugInfo::EmitUsingDirective(const UsingDirectiveDecl &UD) {
4816 if (!CGM.getCodeGenOpts().hasReducedDebugInfo())
4817 return;
4818 const NamespaceDecl *NSDecl = UD.getNominatedNamespace();
4819 if (!NSDecl->isAnonymousNamespace() ||
4820 CGM.getCodeGenOpts().DebugExplicitImport) {
4821 auto Loc = UD.getLocation();
4822 DBuilder.createImportedModule(
4823 getCurrentContextDescriptor(cast<Decl>(UD.getDeclContext())),
4824 getOrCreateNamespace(NSDecl), getOrCreateFile(Loc), getLineNumber(Loc));
4825 }
4826}
4827
4828void CGDebugInfo::EmitUsingDecl(const UsingDecl &UD) {
4829 if (!CGM.getCodeGenOpts().hasReducedDebugInfo())
4830 return;
4831 assert(UD.shadow_size() &&((UD.shadow_size() && "We shouldn't be codegening an invalid UsingDecl containing no decls"
) ? static_cast<void> (0) : __assert_fail ("UD.shadow_size() && \"We shouldn't be codegening an invalid UsingDecl containing no decls\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4832, __PRETTY_FUNCTION__))
4832 "We shouldn't be codegening an invalid UsingDecl containing no decls")((UD.shadow_size() && "We shouldn't be codegening an invalid UsingDecl containing no decls"
) ? static_cast<void> (0) : __assert_fail ("UD.shadow_size() && \"We shouldn't be codegening an invalid UsingDecl containing no decls\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4832, __PRETTY_FUNCTION__))
;
4833 // Emitting one decl is sufficient - debuggers can detect that this is an
4834 // overloaded name & provide lookup for all the overloads.
4835 const UsingShadowDecl &USD = **UD.shadow_begin();
4836
4837 // FIXME: Skip functions with undeduced auto return type for now since we
4838 // don't currently have the plumbing for separate declarations & definitions
4839 // of free functions and mismatched types (auto in the declaration, concrete
4840 // return type in the definition)
4841 if (const auto *FD = dyn_cast<FunctionDecl>(USD.getUnderlyingDecl()))
4842 if (const auto *AT =
4843 FD->getType()->castAs<FunctionProtoType>()->getContainedAutoType())
4844 if (AT->getDeducedType().isNull())
4845 return;
4846 if (llvm::DINode *Target =
4847 getDeclarationOrDefinition(USD.getUnderlyingDecl())) {
4848 auto Loc = USD.getLocation();
4849 DBuilder.createImportedDeclaration(
4850 getCurrentContextDescriptor(cast<Decl>(USD.getDeclContext())), Target,
4851 getOrCreateFile(Loc), getLineNumber(Loc));
4852 }
4853}
4854
4855void CGDebugInfo::EmitImportDecl(const ImportDecl &ID) {
4856 if (CGM.getCodeGenOpts().getDebuggerTuning() != llvm::DebuggerKind::LLDB)
4857 return;
4858 if (Module *M = ID.getImportedModule()) {
4859 auto Info = ASTSourceDescriptor(*M);
4860 auto Loc = ID.getLocation();
4861 DBuilder.createImportedDeclaration(
4862 getCurrentContextDescriptor(cast<Decl>(ID.getDeclContext())),
4863 getOrCreateModuleRef(Info, DebugTypeExtRefs), getOrCreateFile(Loc),
4864 getLineNumber(Loc));
4865 }
4866}
4867
4868llvm::DIImportedEntity *
4869CGDebugInfo::EmitNamespaceAlias(const NamespaceAliasDecl &NA) {
4870 if (!CGM.getCodeGenOpts().hasReducedDebugInfo())
4871 return nullptr;
4872 auto &VH = NamespaceAliasCache[&NA];
4873 if (VH)
4874 return cast<llvm::DIImportedEntity>(VH);
4875 llvm::DIImportedEntity *R;
4876 auto Loc = NA.getLocation();
4877 if (const auto *Underlying =
4878 dyn_cast<NamespaceAliasDecl>(NA.getAliasedNamespace()))
4879 // This could cache & dedup here rather than relying on metadata deduping.
4880 R = DBuilder.createImportedDeclaration(
4881 getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
4882 EmitNamespaceAlias(*Underlying), getOrCreateFile(Loc),
4883 getLineNumber(Loc), NA.getName());
4884 else
4885 R = DBuilder.createImportedDeclaration(
4886 getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
4887 getOrCreateNamespace(cast<NamespaceDecl>(NA.getAliasedNamespace())),
4888 getOrCreateFile(Loc), getLineNumber(Loc), NA.getName());
4889 VH.reset(R);
4890 return R;
4891}
4892
4893llvm::DINamespace *
4894CGDebugInfo::getOrCreateNamespace(const NamespaceDecl *NSDecl) {
4895 // Don't canonicalize the NamespaceDecl here: The DINamespace will be uniqued
4896 // if necessary, and this way multiple declarations of the same namespace in
4897 // different parent modules stay distinct.
4898 auto I = NamespaceCache.find(NSDecl);
4899 if (I != NamespaceCache.end())
4900 return cast<llvm::DINamespace>(I->second);
4901
4902 llvm::DIScope *Context = getDeclContextDescriptor(NSDecl);
4903 // Don't trust the context if it is a DIModule (see comment above).
4904 llvm::DINamespace *NS =
4905 DBuilder.createNameSpace(Context, NSDecl->getName(), NSDecl->isInline());
4906 NamespaceCache[NSDecl].reset(NS);
4907 return NS;
4908}
4909
4910void CGDebugInfo::setDwoId(uint64_t Signature) {
4911 assert(TheCU && "no main compile unit")((TheCU && "no main compile unit") ? static_cast<void
> (0) : __assert_fail ("TheCU && \"no main compile unit\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4911, __PRETTY_FUNCTION__))
;
4912 TheCU->setDWOId(Signature);
4913}
4914
4915void CGDebugInfo::finalize() {
4916 // Creating types might create further types - invalidating the current
4917 // element and the size(), so don't cache/reference them.
4918 for (size_t i = 0; i != ObjCInterfaceCache.size(); ++i) {
4919 ObjCInterfaceCacheEntry E = ObjCInterfaceCache[i];
4920 llvm::DIType *Ty = E.Type->getDecl()->getDefinition()
4921 ? CreateTypeDefinition(E.Type, E.Unit)
4922 : E.Decl;
4923 DBuilder.replaceTemporary(llvm::TempDIType(E.Decl), Ty);
4924 }
4925
4926 // Add methods to interface.
4927 for (const auto &P : ObjCMethodCache) {
4928 if (P.second.empty())
4929 continue;
4930
4931 QualType QTy(P.first->getTypeForDecl(), 0);
4932 auto It = TypeCache.find(QTy.getAsOpaquePtr());
4933 assert(It != TypeCache.end())((It != TypeCache.end()) ? static_cast<void> (0) : __assert_fail
("It != TypeCache.end()", "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4933, __PRETTY_FUNCTION__))
;
4934
4935 llvm::DICompositeType *InterfaceDecl =
4936 cast<llvm::DICompositeType>(It->second);
4937
4938 auto CurElts = InterfaceDecl->getElements();
4939 SmallVector<llvm::Metadata *, 16> EltTys(CurElts.begin(), CurElts.end());
4940
4941 // For DWARF v4 or earlier, only add objc_direct methods.
4942 for (auto &SubprogramDirect : P.second)
4943 if (CGM.getCodeGenOpts().DwarfVersion >= 5 || SubprogramDirect.getInt())
4944 EltTys.push_back(SubprogramDirect.getPointer());
4945
4946 llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
4947 DBuilder.replaceArrays(InterfaceDecl, Elements);
4948 }
4949
4950 for (const auto &P : ReplaceMap) {
4951 assert(P.second)((P.second) ? static_cast<void> (0) : __assert_fail ("P.second"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4951, __PRETTY_FUNCTION__))
;
4952 auto *Ty = cast<llvm::DIType>(P.second);
4953 assert(Ty->isForwardDecl())((Ty->isForwardDecl()) ? static_cast<void> (0) : __assert_fail
("Ty->isForwardDecl()", "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4953, __PRETTY_FUNCTION__))
;
4954
4955 auto It = TypeCache.find(P.first);
4956 assert(It != TypeCache.end())((It != TypeCache.end()) ? static_cast<void> (0) : __assert_fail
("It != TypeCache.end()", "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4956, __PRETTY_FUNCTION__))
;
4957 assert(It->second)((It->second) ? static_cast<void> (0) : __assert_fail
("It->second", "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4957, __PRETTY_FUNCTION__))
;
4958
4959 DBuilder.replaceTemporary(llvm::TempDIType(Ty),
4960 cast<llvm::DIType>(It->second));
4961 }
4962
4963 for (const auto &P : FwdDeclReplaceMap) {
4964 assert(P.second)((P.second) ? static_cast<void> (0) : __assert_fail ("P.second"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/lib/CodeGen/CGDebugInfo.cpp"
, 4964, __PRETTY_FUNCTION__))
;
4965 llvm::TempMDNode FwdDecl(cast<llvm::MDNode>(P.second));
4966 llvm::Metadata *Repl;
4967
4968 auto It = DeclCache.find(P.first);
4969 // If there has been no definition for the declaration, call RAUW
4970 // with ourselves, that will destroy the temporary MDNode and
4971 // replace it with a standard one, avoiding leaking memory.
4972 if (It == DeclCache.end())
4973 Repl = P.second;
4974 else
4975 Repl = It->second;
4976
4977 if (auto *GVE = dyn_cast_or_null<llvm::DIGlobalVariableExpression>(Repl))
4978 Repl = GVE->getVariable();
4979 DBuilder.replaceTemporary(std::move(FwdDecl), cast<llvm::MDNode>(Repl));
4980 }
4981
4982 // We keep our own list of retained types, because we need to look
4983 // up the final type in the type cache.
4984 for (auto &RT : RetainedTypes)
4985 if (auto MD = TypeCache[RT])
4986 DBuilder.retainType(cast<llvm::DIType>(MD));
4987
4988 DBuilder.finalize();
4989}
4990
4991// Don't ignore in case of explicit cast where it is referenced indirectly.
4992void CGDebugInfo::EmitExplicitCastType(QualType Ty) {
4993 if (CGM.getCodeGenOpts().hasReducedDebugInfo())
4994 if (auto *DieTy = getOrCreateType(Ty, TheCU->getFile()))
4995 DBuilder.retainType(DieTy);
4996}
4997
4998void CGDebugInfo::EmitAndRetainType(QualType Ty) {
4999 if (CGM.getCodeGenOpts().hasMaybeUnusedDebugInfo())
1
Taking true branch
5000 if (auto *DieTy = getOrCreateType(Ty, TheCU->getFile()))
2
Calling 'CGDebugInfo::getOrCreateType'
5001 DBuilder.retainType(DieTy);
5002}
5003
5004llvm::DebugLoc CGDebugInfo::SourceLocToDebugLoc(SourceLocation Loc) {
5005 if (LexicalBlockStack.empty())
5006 return llvm::DebugLoc();
5007
5008 llvm::MDNode *Scope = LexicalBlockStack.back();
5009 return llvm::DebugLoc::get(getLineNumber(Loc), getColumnNumber(Loc), Scope);
5010}
5011
5012llvm::DINode::DIFlags CGDebugInfo::getCallSiteRelatedAttrs() const {
5013 // Call site-related attributes are only useful in optimized programs, and
5014 // when there's a possibility of debugging backtraces.
5015 if (!CGM.getLangOpts().Optimize || DebugKind == codegenoptions::NoDebugInfo ||
5016 DebugKind == codegenoptions::LocTrackingOnly)
5017 return llvm::DINode::FlagZero;
5018
5019 // Call site-related attributes are available in DWARF v5. Some debuggers,
5020 // while not fully DWARF v5-compliant, may accept these attributes as if they
5021 // were part of DWARF v4.
5022 bool SupportsDWARFv4Ext =
5023 CGM.getCodeGenOpts().DwarfVersion == 4 &&
5024 (CGM.getCodeGenOpts().getDebuggerTuning() == llvm::DebuggerKind::LLDB ||
5025 CGM.getCodeGenOpts().getDebuggerTuning() == llvm::DebuggerKind::GDB);
5026
5027 if (!SupportsDWARFv4Ext && CGM.getCodeGenOpts().DwarfVersion < 5)
5028 return llvm::DINode::FlagZero;
5029
5030 return llvm::DINode::FlagAllCallsDescribed;
5031}

/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h

1//===- Type.h - C Language Family Type Representation -----------*- C++ -*-===//
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/// \file
10/// C Language Family Type Representation
11///
12/// This file defines the clang::Type interface and subclasses, used to
13/// represent types for languages in the C family.
14//
15//===----------------------------------------------------------------------===//
16
17#ifndef LLVM_CLANG_AST_TYPE_H
18#define LLVM_CLANG_AST_TYPE_H
19
20#include "clang/AST/DependenceFlags.h"
21#include "clang/AST/NestedNameSpecifier.h"
22#include "clang/AST/TemplateName.h"
23#include "clang/Basic/AddressSpaces.h"
24#include "clang/Basic/AttrKinds.h"
25#include "clang/Basic/Diagnostic.h"
26#include "clang/Basic/ExceptionSpecificationType.h"
27#include "clang/Basic/LLVM.h"
28#include "clang/Basic/Linkage.h"
29#include "clang/Basic/PartialDiagnostic.h"
30#include "clang/Basic/SourceLocation.h"
31#include "clang/Basic/Specifiers.h"
32#include "clang/Basic/Visibility.h"
33#include "llvm/ADT/APInt.h"
34#include "llvm/ADT/APSInt.h"
35#include "llvm/ADT/ArrayRef.h"
36#include "llvm/ADT/FoldingSet.h"
37#include "llvm/ADT/None.h"
38#include "llvm/ADT/Optional.h"
39#include "llvm/ADT/PointerIntPair.h"
40#include "llvm/ADT/PointerUnion.h"
41#include "llvm/ADT/StringRef.h"
42#include "llvm/ADT/Twine.h"
43#include "llvm/ADT/iterator_range.h"
44#include "llvm/Support/Casting.h"
45#include "llvm/Support/Compiler.h"
46#include "llvm/Support/ErrorHandling.h"
47#include "llvm/Support/PointerLikeTypeTraits.h"
48#include "llvm/Support/TrailingObjects.h"
49#include "llvm/Support/type_traits.h"
50#include <cassert>
51#include <cstddef>
52#include <cstdint>
53#include <cstring>
54#include <string>
55#include <type_traits>
56#include <utility>
57
58namespace clang {
59
60class ExtQuals;
61class QualType;
62class ConceptDecl;
63class TagDecl;
64class Type;
65
66enum {
67 TypeAlignmentInBits = 4,
68 TypeAlignment = 1 << TypeAlignmentInBits
69};
70
71namespace serialization {
72 template <class T> class AbstractTypeReader;
73 template <class T> class AbstractTypeWriter;
74}
75
76} // namespace clang
77
78namespace llvm {
79
80 template <typename T>
81 struct PointerLikeTypeTraits;
82 template<>
83 struct PointerLikeTypeTraits< ::clang::Type*> {
84 static inline void *getAsVoidPointer(::clang::Type *P) { return P; }
85
86 static inline ::clang::Type *getFromVoidPointer(void *P) {
87 return static_cast< ::clang::Type*>(P);
88 }
89
90 static constexpr int NumLowBitsAvailable = clang::TypeAlignmentInBits;
91 };
92
93 template<>
94 struct PointerLikeTypeTraits< ::clang::ExtQuals*> {
95 static inline void *getAsVoidPointer(::clang::ExtQuals *P) { return P; }
96
97 static inline ::clang::ExtQuals *getFromVoidPointer(void *P) {
98 return static_cast< ::clang::ExtQuals*>(P);
99 }
100
101 static constexpr int NumLowBitsAvailable = clang::TypeAlignmentInBits;
102 };
103
104} // namespace llvm
105
106namespace clang {
107
108class ASTContext;
109template <typename> class CanQual;
110class CXXRecordDecl;
111class DeclContext;
112class EnumDecl;
113class Expr;
114class ExtQualsTypeCommonBase;
115class FunctionDecl;
116class IdentifierInfo;
117class NamedDecl;
118class ObjCInterfaceDecl;
119class ObjCProtocolDecl;
120class ObjCTypeParamDecl;
121struct PrintingPolicy;
122class RecordDecl;
123class Stmt;
124class TagDecl;
125class TemplateArgument;
126class TemplateArgumentListInfo;
127class TemplateArgumentLoc;
128class TemplateTypeParmDecl;
129class TypedefNameDecl;
130class UnresolvedUsingTypenameDecl;
131
132using CanQualType = CanQual<Type>;
133
134// Provide forward declarations for all of the *Type classes.
135#define TYPE(Class, Base) class Class##Type;
136#include "clang/AST/TypeNodes.inc"
137
138/// The collection of all-type qualifiers we support.
139/// Clang supports five independent qualifiers:
140/// * C99: const, volatile, and restrict
141/// * MS: __unaligned
142/// * Embedded C (TR18037): address spaces
143/// * Objective C: the GC attributes (none, weak, or strong)
144class Qualifiers {
145public:
146 enum TQ { // NOTE: These flags must be kept in sync with DeclSpec::TQ.
147 Const = 0x1,
148 Restrict = 0x2,
149 Volatile = 0x4,
150 CVRMask = Const | Volatile | Restrict
151 };
152
153 enum GC {
154 GCNone = 0,
155 Weak,
156 Strong
157 };
158
159 enum ObjCLifetime {
160 /// There is no lifetime qualification on this type.
161 OCL_None,
162
163 /// This object can be modified without requiring retains or
164 /// releases.
165 OCL_ExplicitNone,
166
167 /// Assigning into this object requires the old value to be
168 /// released and the new value to be retained. The timing of the
169 /// release of the old value is inexact: it may be moved to
170 /// immediately after the last known point where the value is
171 /// live.
172 OCL_Strong,
173
174 /// Reading or writing from this object requires a barrier call.
175 OCL_Weak,
176
177 /// Assigning into this object requires a lifetime extension.
178 OCL_Autoreleasing
179 };
180
181 enum {
182 /// The maximum supported address space number.
183 /// 23 bits should be enough for anyone.
184 MaxAddressSpace = 0x7fffffu,
185
186 /// The width of the "fast" qualifier mask.
187 FastWidth = 3,
188
189 /// The fast qualifier mask.
190 FastMask = (1 << FastWidth) - 1
191 };
192
193 /// Returns the common set of qualifiers while removing them from
194 /// the given sets.
195 static Qualifiers removeCommonQualifiers(Qualifiers &L, Qualifiers &R) {
196 // If both are only CVR-qualified, bit operations are sufficient.
197 if (!(L.Mask & ~CVRMask) && !(R.Mask & ~CVRMask)) {
198 Qualifiers Q;
199 Q.Mask = L.Mask & R.Mask;
200 L.Mask &= ~Q.Mask;
201 R.Mask &= ~Q.Mask;
202 return Q;
203 }
204
205 Qualifiers Q;
206 unsigned CommonCRV = L.getCVRQualifiers() & R.getCVRQualifiers();
207 Q.addCVRQualifiers(CommonCRV);
208 L.removeCVRQualifiers(CommonCRV);
209 R.removeCVRQualifiers(CommonCRV);
210
211 if (L.getObjCGCAttr() == R.getObjCGCAttr()) {
212 Q.setObjCGCAttr(L.getObjCGCAttr());
213 L.removeObjCGCAttr();
214 R.removeObjCGCAttr();
215 }
216
217 if (L.getObjCLifetime() == R.getObjCLifetime()) {
218 Q.setObjCLifetime(L.getObjCLifetime());
219 L.removeObjCLifetime();
220 R.removeObjCLifetime();
221 }
222
223 if (L.getAddressSpace() == R.getAddressSpace()) {
224 Q.setAddressSpace(L.getAddressSpace());
225 L.removeAddressSpace();
226 R.removeAddressSpace();
227 }
228 return Q;
229 }
230
231 static Qualifiers fromFastMask(unsigned Mask) {
232 Qualifiers Qs;
233 Qs.addFastQualifiers(Mask);
234 return Qs;
235 }
236
237 static Qualifiers fromCVRMask(unsigned CVR) {
238 Qualifiers Qs;
239 Qs.addCVRQualifiers(CVR);
240 return Qs;
241 }
242
243 static Qualifiers fromCVRUMask(unsigned CVRU) {
244 Qualifiers Qs;
245 Qs.addCVRUQualifiers(CVRU);
246 return Qs;
247 }
248
249 // Deserialize qualifiers from an opaque representation.
250 static Qualifiers fromOpaqueValue(unsigned opaque) {
251 Qualifiers Qs;
252 Qs.Mask = opaque;
253 return Qs;
254 }
255
256 // Serialize these qualifiers into an opaque representation.
257 unsigned getAsOpaqueValue() const {
258 return Mask;
259 }
260
261 bool hasConst() const { return Mask & Const; }
262 bool hasOnlyConst() const { return Mask == Const; }
263 void removeConst() { Mask &= ~Const; }
264 void addConst() { Mask |= Const; }
265
266 bool hasVolatile() const { return Mask & Volatile; }
267 bool hasOnlyVolatile() const { return Mask == Volatile; }
268 void removeVolatile() { Mask &= ~Volatile; }
269 void addVolatile() { Mask |= Volatile; }
270
271 bool hasRestrict() const { return Mask & Restrict; }
272 bool hasOnlyRestrict() const { return Mask == Restrict; }
273 void removeRestrict() { Mask &= ~Restrict; }
274 void addRestrict() { Mask |= Restrict; }
275
276 bool hasCVRQualifiers() const { return getCVRQualifiers(); }
277 unsigned getCVRQualifiers() const { return Mask & CVRMask; }
278 unsigned getCVRUQualifiers() const { return Mask & (CVRMask | UMask); }
279
280 void setCVRQualifiers(unsigned mask) {
281 assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits")((!(mask & ~CVRMask) && "bitmask contains non-CVR bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~CVRMask) && \"bitmask contains non-CVR bits\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 281, __PRETTY_FUNCTION__))
;
282 Mask = (Mask & ~CVRMask) | mask;
283 }
284 void removeCVRQualifiers(unsigned mask) {
285 assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits")((!(mask & ~CVRMask) && "bitmask contains non-CVR bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~CVRMask) && \"bitmask contains non-CVR bits\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 285, __PRETTY_FUNCTION__))
;
286 Mask &= ~mask;
287 }
288 void removeCVRQualifiers() {
289 removeCVRQualifiers(CVRMask);
290 }
291 void addCVRQualifiers(unsigned mask) {
292 assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits")((!(mask & ~CVRMask) && "bitmask contains non-CVR bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~CVRMask) && \"bitmask contains non-CVR bits\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 292, __PRETTY_FUNCTION__))
;
293 Mask |= mask;
294 }
295 void addCVRUQualifiers(unsigned mask) {
296 assert(!(mask & ~CVRMask & ~UMask) && "bitmask contains non-CVRU bits")((!(mask & ~CVRMask & ~UMask) && "bitmask contains non-CVRU bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~CVRMask & ~UMask) && \"bitmask contains non-CVRU bits\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 296, __PRETTY_FUNCTION__))
;
297 Mask |= mask;
298 }
299
300 bool hasUnaligned() const { return Mask & UMask; }
301 void setUnaligned(bool flag) {
302 Mask = (Mask & ~UMask) | (flag ? UMask : 0);
303 }
304 void removeUnaligned() { Mask &= ~UMask; }
305 void addUnaligned() { Mask |= UMask; }
306
307 bool hasObjCGCAttr() const { return Mask & GCAttrMask; }
308 GC getObjCGCAttr() const { return GC((Mask & GCAttrMask) >> GCAttrShift); }
309 void setObjCGCAttr(GC type) {
310 Mask = (Mask & ~GCAttrMask) | (type << GCAttrShift);
311 }
312 void removeObjCGCAttr() { setObjCGCAttr(GCNone); }
313 void addObjCGCAttr(GC type) {
314 assert(type)((type) ? static_cast<void> (0) : __assert_fail ("type"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 314, __PRETTY_FUNCTION__))
;
315 setObjCGCAttr(type);
316 }
317 Qualifiers withoutObjCGCAttr() const {
318 Qualifiers qs = *this;
319 qs.removeObjCGCAttr();
320 return qs;
321 }
322 Qualifiers withoutObjCLifetime() const {
323 Qualifiers qs = *this;
324 qs.removeObjCLifetime();
325 return qs;
326 }
327 Qualifiers withoutAddressSpace() const {
328 Qualifiers qs = *this;
329 qs.removeAddressSpace();
330 return qs;
331 }
332
333 bool hasObjCLifetime() const { return Mask & LifetimeMask; }
334 ObjCLifetime getObjCLifetime() const {
335 return ObjCLifetime((Mask & LifetimeMask) >> LifetimeShift);
336 }
337 void setObjCLifetime(ObjCLifetime type) {
338 Mask = (Mask & ~LifetimeMask) | (type << LifetimeShift);
339 }
340 void removeObjCLifetime() { setObjCLifetime(OCL_None); }
341 void addObjCLifetime(ObjCLifetime type) {
342 assert(type)((type) ? static_cast<void> (0) : __assert_fail ("type"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 342, __PRETTY_FUNCTION__))
;
343 assert(!hasObjCLifetime())((!hasObjCLifetime()) ? static_cast<void> (0) : __assert_fail
("!hasObjCLifetime()", "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 343, __PRETTY_FUNCTION__))
;
344 Mask |= (type << LifetimeShift);
345 }
346
347 /// True if the lifetime is neither None or ExplicitNone.
348 bool hasNonTrivialObjCLifetime() const {
349 ObjCLifetime lifetime = getObjCLifetime();
350 return (lifetime > OCL_ExplicitNone);
351 }
352
353 /// True if the lifetime is either strong or weak.
354 bool hasStrongOrWeakObjCLifetime() const {
355 ObjCLifetime lifetime = getObjCLifetime();
356 return (lifetime == OCL_Strong || lifetime == OCL_Weak);
357 }
358
359 bool hasAddressSpace() const { return Mask & AddressSpaceMask; }
360 LangAS getAddressSpace() const {
361 return static_cast<LangAS>(Mask >> AddressSpaceShift);
362 }
363 bool hasTargetSpecificAddressSpace() const {
364 return isTargetAddressSpace(getAddressSpace());
365 }
366 /// Get the address space attribute value to be printed by diagnostics.
367 unsigned getAddressSpaceAttributePrintValue() const {
368 auto Addr = getAddressSpace();
369 // This function is not supposed to be used with language specific
370 // address spaces. If that happens, the diagnostic message should consider
371 // printing the QualType instead of the address space value.
372 assert(Addr == LangAS::Default || hasTargetSpecificAddressSpace())((Addr == LangAS::Default || hasTargetSpecificAddressSpace())
? static_cast<void> (0) : __assert_fail ("Addr == LangAS::Default || hasTargetSpecificAddressSpace()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 372, __PRETTY_FUNCTION__))
;
373 if (Addr != LangAS::Default)
374 return toTargetAddressSpace(Addr);
375 // TODO: The diagnostic messages where Addr may be 0 should be fixed
376 // since it cannot differentiate the situation where 0 denotes the default
377 // address space or user specified __attribute__((address_space(0))).
378 return 0;
379 }
380 void setAddressSpace(LangAS space) {
381 assert((unsigned)space <= MaxAddressSpace)(((unsigned)space <= MaxAddressSpace) ? static_cast<void
> (0) : __assert_fail ("(unsigned)space <= MaxAddressSpace"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 381, __PRETTY_FUNCTION__))
;
382 Mask = (Mask & ~AddressSpaceMask)
383 | (((uint32_t) space) << AddressSpaceShift);
384 }
385 void removeAddressSpace() { setAddressSpace(LangAS::Default); }
386 void addAddressSpace(LangAS space) {
387 assert(space != LangAS::Default)((space != LangAS::Default) ? static_cast<void> (0) : __assert_fail
("space != LangAS::Default", "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 387, __PRETTY_FUNCTION__))
;
388 setAddressSpace(space);
389 }
390
391 // Fast qualifiers are those that can be allocated directly
392 // on a QualType object.
393 bool hasFastQualifiers() const { return getFastQualifiers(); }
394 unsigned getFastQualifiers() const { return Mask & FastMask; }
395 void setFastQualifiers(unsigned mask) {
396 assert(!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits")((!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~FastMask) && \"bitmask contains non-fast qualifier bits\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 396, __PRETTY_FUNCTION__))
;
397 Mask = (Mask & ~FastMask) | mask;
398 }
399 void removeFastQualifiers(unsigned mask) {
400 assert(!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits")((!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~FastMask) && \"bitmask contains non-fast qualifier bits\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 400, __PRETTY_FUNCTION__))
;
401 Mask &= ~mask;
402 }
403 void removeFastQualifiers() {
404 removeFastQualifiers(FastMask);
405 }
406 void addFastQualifiers(unsigned mask) {
407 assert(!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits")((!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~FastMask) && \"bitmask contains non-fast qualifier bits\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 407, __PRETTY_FUNCTION__))
;
408 Mask |= mask;
409 }
410
411 /// Return true if the set contains any qualifiers which require an ExtQuals
412 /// node to be allocated.
413 bool hasNonFastQualifiers() const { return Mask & ~FastMask; }
414 Qualifiers getNonFastQualifiers() const {
415 Qualifiers Quals = *this;
416 Quals.setFastQualifiers(0);
417 return Quals;
418 }
419
420 /// Return true if the set contains any qualifiers.
421 bool hasQualifiers() const { return Mask; }
422 bool empty() const { return !Mask; }
423
424 /// Add the qualifiers from the given set to this set.
425 void addQualifiers(Qualifiers Q) {
426 // If the other set doesn't have any non-boolean qualifiers, just
427 // bit-or it in.
428 if (!(Q.Mask & ~CVRMask))
429 Mask |= Q.Mask;
430 else {
431 Mask |= (Q.Mask & CVRMask);
432 if (Q.hasAddressSpace())
433 addAddressSpace(Q.getAddressSpace());
434 if (Q.hasObjCGCAttr())
435 addObjCGCAttr(Q.getObjCGCAttr());
436 if (Q.hasObjCLifetime())
437 addObjCLifetime(Q.getObjCLifetime());
438 }
439 }
440
441 /// Remove the qualifiers from the given set from this set.
442 void removeQualifiers(Qualifiers Q) {
443 // If the other set doesn't have any non-boolean qualifiers, just
444 // bit-and the inverse in.
445 if (!(Q.Mask & ~CVRMask))
446 Mask &= ~Q.Mask;
447 else {
448 Mask &= ~(Q.Mask & CVRMask);
449 if (getObjCGCAttr() == Q.getObjCGCAttr())
450 removeObjCGCAttr();
451 if (getObjCLifetime() == Q.getObjCLifetime())
452 removeObjCLifetime();
453 if (getAddressSpace() == Q.getAddressSpace())
454 removeAddressSpace();
455 }
456 }
457
458 /// Add the qualifiers from the given set to this set, given that
459 /// they don't conflict.
460 void addConsistentQualifiers(Qualifiers qs) {
461 assert(getAddressSpace() == qs.getAddressSpace() ||((getAddressSpace() == qs.getAddressSpace() || !hasAddressSpace
() || !qs.hasAddressSpace()) ? static_cast<void> (0) : __assert_fail
("getAddressSpace() == qs.getAddressSpace() || !hasAddressSpace() || !qs.hasAddressSpace()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 462, __PRETTY_FUNCTION__))
462 !hasAddressSpace() || !qs.hasAddressSpace())((getAddressSpace() == qs.getAddressSpace() || !hasAddressSpace
() || !qs.hasAddressSpace()) ? static_cast<void> (0) : __assert_fail
("getAddressSpace() == qs.getAddressSpace() || !hasAddressSpace() || !qs.hasAddressSpace()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 462, __PRETTY_FUNCTION__))
;
463 assert(getObjCGCAttr() == qs.getObjCGCAttr() ||((getObjCGCAttr() == qs.getObjCGCAttr() || !hasObjCGCAttr() ||
!qs.hasObjCGCAttr()) ? static_cast<void> (0) : __assert_fail
("getObjCGCAttr() == qs.getObjCGCAttr() || !hasObjCGCAttr() || !qs.hasObjCGCAttr()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 464, __PRETTY_FUNCTION__))
464 !hasObjCGCAttr() || !qs.hasObjCGCAttr())((getObjCGCAttr() == qs.getObjCGCAttr() || !hasObjCGCAttr() ||
!qs.hasObjCGCAttr()) ? static_cast<void> (0) : __assert_fail
("getObjCGCAttr() == qs.getObjCGCAttr() || !hasObjCGCAttr() || !qs.hasObjCGCAttr()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 464, __PRETTY_FUNCTION__))
;
465 assert(getObjCLifetime() == qs.getObjCLifetime() ||((getObjCLifetime() == qs.getObjCLifetime() || !hasObjCLifetime
() || !qs.hasObjCLifetime()) ? static_cast<void> (0) : __assert_fail
("getObjCLifetime() == qs.getObjCLifetime() || !hasObjCLifetime() || !qs.hasObjCLifetime()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 466, __PRETTY_FUNCTION__))
466 !hasObjCLifetime() || !qs.hasObjCLifetime())((getObjCLifetime() == qs.getObjCLifetime() || !hasObjCLifetime
() || !qs.hasObjCLifetime()) ? static_cast<void> (0) : __assert_fail
("getObjCLifetime() == qs.getObjCLifetime() || !hasObjCLifetime() || !qs.hasObjCLifetime()"
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 466, __PRETTY_FUNCTION__))
;
467 Mask |= qs.Mask;
468 }
469
470 /// Returns true if address space A is equal to or a superset of B.
471 /// OpenCL v2.0 defines conversion rules (OpenCLC v2.0 s6.5.5) and notion of
472 /// overlapping address spaces.
473 /// CL1.1 or CL1.2:
474 /// every address space is a superset of itself.
475 /// CL2.0 adds:
476 /// __generic is a superset of any address space except for __constant.
477 static bool isAddressSpaceSupersetOf(LangAS A, LangAS B) {
478 // Address spaces must match exactly.
479 return A == B ||
480 // Otherwise in OpenCLC v2.0 s6.5.5: every address space except
481 // for __constant can be used as __generic.
482 (A == LangAS::opencl_generic && B != LangAS::opencl_constant) ||
483 // We also define global_device and global_host address spaces,
484 // to distinguish global pointers allocated on host from pointers
485 // allocated on device, which are a subset of __global.
486 (A == LangAS::opencl_global && (B == LangAS::opencl_global_device ||
487 B == LangAS::opencl_global_host)) ||
488 // Consider pointer size address spaces to be equivalent to default.
489 ((isPtrSizeAddressSpace(A) || A == LangAS::Default) &&
490 (isPtrSizeAddressSpace(B) || B == LangAS::Default));
491 }
492
493 /// Returns true if the address space in these qualifiers is equal to or
494 /// a superset of the address space in the argument qualifiers.
495 bool isAddressSpaceSupersetOf(Qualifiers other) const {
496 return isAddressSpaceSupersetOf(getAddressSpace(), other.getAddressSpace());
497 }
498
499 /// Determines if these qualifiers compatibly include another set.
500 /// Generally this answers the question of whether an object with the other
501 /// qualifiers can be safely used as an object with these qualifiers.
502 bool compatiblyIncludes(Qualifiers other) const {
503 return isAddressSpaceSupersetOf(other) &&
504 // ObjC GC qualifiers can match, be added, or be removed, but can't
505 // be changed.
506 (getObjCGCAttr() == other.getObjCGCAttr() || !hasObjCGCAttr() ||
507 !other.hasObjCGCAttr()) &&
508 // ObjC lifetime qualifiers must match exactly.
509 getObjCLifetime() == other.getObjCLifetime() &&
510 // CVR qualifiers may subset.
511 (((Mask & CVRMask) | (other.Mask & CVRMask)) == (Mask & CVRMask)) &&
512 // U qualifier may superset.
513 (!other.hasUnaligned() || hasUnaligned());
514 }
515
516 /// Determines if these qualifiers compatibly include another set of
517 /// qualifiers from the narrow perspective of Objective-C ARC lifetime.
518 ///
519 /// One set of Objective-C lifetime qualifiers compatibly includes the other
520 /// if the lifetime qualifiers match, or if both are non-__weak and the
521 /// including set also contains the 'const' qualifier, or both are non-__weak
522 /// and one is None (which can only happen in non-ARC modes).
523 bool compatiblyIncludesObjCLifetime(Qualifiers other) const {
524 if (getObjCLifetime() == other.getObjCLifetime())
525 return true;
526
527 if (getObjCLifetime() == OCL_Weak || other.getObjCLifetime() == OCL_Weak)
528 return false;
529
530 if (getObjCLifetime() == OCL_None || other.getObjCLifetime() == OCL_None)
531 return true;
532
533 return hasConst();
534 }
535
536 /// Determine whether this set of qualifiers is a strict superset of
537 /// another set of qualifiers, not considering qualifier compatibility.
538 bool isStrictSupersetOf(Qualifiers Other) const;
539
540 bool operator==(Qualifiers Other) const { return Mask == Other.Mask; }
541 bool operator!=(Qualifiers Other) const { return Mask != Other.Mask; }
542
543 explicit operator bool() const { return hasQualifiers(); }
544
545 Qualifiers &operator+=(Qualifiers R) {
546 addQualifiers(R);
547 return *this;
548 }
549
550 // Union two qualifier sets. If an enumerated qualifier appears
551 // in both sets, use the one from the right.
552 friend Qualifiers operator+(Qualifiers L, Qualifiers R) {
553 L += R;
554 return L;
555 }
556
557 Qualifiers &operator-=(Qualifiers R) {
558 removeQualifiers(R);
559 return *this;
560 }
561
562 /// Compute the difference between two qualifier sets.
563 friend Qualifiers operator-(Qualifiers L, Qualifiers R) {
564 L -= R;
565 return L;
566 }
567
568 std::string getAsString() const;
569 std::string getAsString(const PrintingPolicy &Policy) const;
570
571 static std::string getAddrSpaceAsString(LangAS AS);
572
573 bool isEmptyWhenPrinted(const PrintingPolicy &Policy) const;
574 void print(raw_ostream &OS, const PrintingPolicy &Policy,
575 bool appendSpaceIfNonEmpty = false) const;
576
577 void Profile(llvm::FoldingSetNodeID &ID) const {
578 ID.AddInteger(Mask);
579 }
580
581private:
582 // bits: |0 1 2|3|4 .. 5|6 .. 8|9 ... 31|
583 // |C R V|U|GCAttr|Lifetime|AddressSpace|
584 uint32_t Mask = 0;
585
586 static const uint32_t UMask = 0x8;
587 static const uint32_t UShift = 3;
588 static const uint32_t GCAttrMask = 0x30;
589 static const uint32_t GCAttrShift = 4;
590 static const uint32_t LifetimeMask = 0x1C0;
591 static const uint32_t LifetimeShift = 6;
592 static const uint32_t AddressSpaceMask =
593 ~(CVRMask | UMask | GCAttrMask | LifetimeMask);
594 static const uint32_t AddressSpaceShift = 9;
595};
596
597/// A std::pair-like structure for storing a qualified type split
598/// into its local qualifiers and its locally-unqualified type.
599struct SplitQualType {
600 /// The locally-unqualified type.
601 const Type *Ty = nullptr;
602
603 /// The local qualifiers.
604 Qualifiers Quals;
605
606 SplitQualType() = default;
607 SplitQualType(const Type *ty, Qualifiers qs) : Ty(ty), Quals(qs) {}
608
609 SplitQualType getSingleStepDesugaredType() const; // end of this file
610
611 // Make std::tie work.
612 std::pair<const Type *,Qualifiers> asPair() const {
613 return std::pair<const Type *, Qualifiers>(Ty, Quals);
614 }
615
616 friend bool operator==(SplitQualType a, SplitQualType b) {
617 return a.Ty == b.Ty && a.Quals == b.Quals;
618 }
619 friend bool operator!=(SplitQualType a, SplitQualType b) {
620 return a.Ty != b.Ty || a.Quals != b.Quals;
621 }
622};
623
624/// The kind of type we are substituting Objective-C type arguments into.
625///
626/// The kind of substitution affects the replacement of type parameters when
627/// no concrete type information is provided, e.g., when dealing with an
628/// unspecialized type.
629enum class ObjCSubstitutionContext {
630 /// An ordinary type.
631 Ordinary,
632
633 /// The result type of a method or function.
634 Result,
635
636 /// The parameter type of a method or function.
637 Parameter,
638
639 /// The type of a property.
640 Property,
641
642 /// The superclass of a type.
643 Superclass,
644};
645
646/// A (possibly-)qualified type.
647///
648/// For efficiency, we don't store CV-qualified types as nodes on their
649/// own: instead each reference to a type stores the qualifiers. This
650/// greatly reduces the number of nodes we need to allocate for types (for
651/// example we only need one for 'int', 'const int', 'volatile int',
652/// 'const volatile int', etc).
653///
654/// As an added efficiency bonus, instead of making this a pair, we
655/// just store the two bits we care about in the low bits of the
656/// pointer. To handle the packing/unpacking, we make QualType be a
657/// simple wrapper class that acts like a smart pointer. A third bit
658/// indicates whether there are extended qualifiers present, in which
659/// case the pointer points to a special structure.
660class QualType {
661 friend class QualifierCollector;
662
663 // Thankfully, these are efficiently composable.
664 llvm::PointerIntPair<llvm::PointerUnion<const Type *, const ExtQuals *>,
665 Qualifiers::FastWidth> Value;
666
667 const ExtQuals *getExtQualsUnsafe() const {
668 return Value.getPointer().get<const ExtQuals*>();
669 }
670
671 const Type *getTypePtrUnsafe() const {
672 return Value.getPointer().get<const Type*>();
673 }
674
675 const ExtQualsTypeCommonBase *getCommonPtr() const {
676 assert(!isNull() && "Cannot retrieve a NULL type pointer")((!isNull() && "Cannot retrieve a NULL type pointer")
? static_cast<void> (0) : __assert_fail ("!isNull() && \"Cannot retrieve a NULL type pointer\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 676, __PRETTY_FUNCTION__))
;
677 auto CommonPtrVal = reinterpret_cast<uintptr_t>(Value.getOpaqueValue());
678 CommonPtrVal &= ~(uintptr_t)((1 << TypeAlignmentInBits) - 1);
679 return reinterpret_cast<ExtQualsTypeCommonBase*>(CommonPtrVal);
680 }
681
682public:
683 QualType() = default;
684 QualType(const Type *Ptr, unsigned Quals) : Value(Ptr, Quals) {}
685 QualType(const ExtQuals *Ptr, unsigned Quals) : Value(Ptr, Quals) {}
686
687 unsigned getLocalFastQualifiers() const { return Value.getInt(); }
688 void setLocalFastQualifiers(unsigned Quals) { Value.setInt(Quals); }
689
690 /// Retrieves a pointer to the underlying (unqualified) type.
691 ///
692 /// This function requires that the type not be NULL. If the type might be
693 /// NULL, use the (slightly less efficient) \c getTypePtrOrNull().
694 const Type *getTypePtr() const;
695
696 const Type *getTypePtrOrNull() const;
697
698 /// Retrieves a pointer to the name of the base type.
699 const IdentifierInfo *getBaseTypeIdentifier() const;
700
701 /// Divides a QualType into its unqualified type and a set of local
702 /// qualifiers.
703 SplitQualType split() const;
704
705 void *getAsOpaquePtr() const { return Value.getOpaqueValue(); }
706
707 static QualType getFromOpaquePtr(const void *Ptr) {
708 QualType T;
709 T.Value.setFromOpaqueValue(const_cast<void*>(Ptr));
710 return T;
711 }
712
713 const Type &operator*() const {
714 return *getTypePtr();
715 }
716
717 const Type *operator->() const {
718 return getTypePtr();
719 }
720
721 bool isCanonical() const;
722 bool isCanonicalAsParam() const;
723
724 /// Return true if this QualType doesn't point to a type yet.
725 bool isNull() const {
726 return Value.getPointer().isNull();
727 }
728
729 /// Determine whether this particular QualType instance has the
730 /// "const" qualifier set, without looking through typedefs that may have
731 /// added "const" at a different level.
732 bool isLocalConstQualified() const {
733 return (getLocalFastQualifiers() & Qualifiers::Const);
734 }
735
736 /// Determine whether this type is const-qualified.
737 bool isConstQualified() const;
738
739 /// Determine whether this particular QualType instance has the
740 /// "restrict" qualifier set, without looking through typedefs that may have
741 /// added "restrict" at a different level.
742 bool isLocalRestrictQualified() const {
743 return (getLocalFastQualifiers() & Qualifiers::Restrict);
744 }
745
746 /// Determine whether this type is restrict-qualified.
747 bool isRestrictQualified() const;
748
749 /// Determine whether this particular QualType instance has the
750 /// "volatile" qualifier set, without looking through typedefs that may have
751 /// added "volatile" at a different level.
752 bool isLocalVolatileQualified() const {
753 return (getLocalFastQualifiers() & Qualifiers::Volatile);
754 }
755
756 /// Determine whether this type is volatile-qualified.
757 bool isVolatileQualified() const;
758
759 /// Determine whether this particular QualType instance has any
760 /// qualifiers, without looking through any typedefs that might add
761 /// qualifiers at a different level.
762 bool hasLocalQualifiers() const {
763 return getLocalFastQualifiers() || hasLocalNonFastQualifiers();
764 }
765
766 /// Determine whether this type has any qualifiers.
767 bool hasQualifiers() const;
768
769 /// Determine whether this particular QualType instance has any
770 /// "non-fast" qualifiers, e.g., those that are stored in an ExtQualType
771 /// instance.
772 bool hasLocalNonFastQualifiers() const {
773 return Value.getPointer().is<const ExtQuals*>();
774 }
775
776 /// Retrieve the set of qualifiers local to this particular QualType
777 /// instance, not including any qualifiers acquired through typedefs or
778 /// other sugar.
779 Qualifiers getLocalQualifiers() const;
780
781 /// Retrieve the set of qualifiers applied to this type.
782 Qualifiers getQualifiers() const;
783
784 /// Retrieve the set of CVR (const-volatile-restrict) qualifiers
785 /// local to this particular QualType instance, not including any qualifiers
786 /// acquired through typedefs or other sugar.
787 unsigned getLocalCVRQualifiers() const {
788 return getLocalFastQualifiers();
789 }
790
791 /// Retrieve the set of CVR (const-volatile-restrict) qualifiers
792 /// applied to this type.
793 unsigned getCVRQualifiers() const;
794
795 bool isConstant(const ASTContext& Ctx) const {
796 return QualType::isConstant(*this, Ctx);
797 }
798
799 /// Determine whether this is a Plain Old Data (POD) type (C++ 3.9p10).
800 bool isPODType(const ASTContext &Context) const;
801
802 /// Return true if this is a POD type according to the rules of the C++98
803 /// standard, regardless of the current compilation's language.
804 bool isCXX98PODType(const ASTContext &Context) const;
805
806 /// Return true if this is a POD type according to the more relaxed rules
807 /// of the C++11 standard, regardless of the current compilation's language.
808 /// (C++0x [basic.types]p9). Note that, unlike
809 /// CXXRecordDecl::isCXX11StandardLayout, this takes DRs into account.
810 bool isCXX11PODType(const ASTContext &Context) const;
811
812 /// Return true if this is a trivial type per (C++0x [basic.types]p9)
813 bool isTrivialType(const ASTContext &Context) const;
814
815 /// Return true if this is a trivially copyable type (C++0x [basic.types]p9)
816 bool isTriviallyCopyableType(const ASTContext &Context) const;
817
818
819 /// Returns true if it is a class and it might be dynamic.
820 bool mayBeDynamicClass() const;
821
822 /// Returns true if it is not a class or if the class might not be dynamic.
823 bool mayBeNotDynamicClass() const;
824
825 // Don't promise in the API that anything besides 'const' can be
826 // easily added.
827
828 /// Add the `const` type qualifier to this QualType.
829 void addConst() {
830 addFastQualifiers(Qualifiers::Const);
831 }
832 QualType withConst() const {
833 return withFastQualifiers(Qualifiers::Const);
834 }
835
836 /// Add the `volatile` type qualifier to this QualType.
837 void addVolatile() {
838 addFastQualifiers(Qualifiers::Volatile);
839 }
840 QualType withVolatile() const {
841 return withFastQualifiers(Qualifiers::Volatile);
842 }
843
844 /// Add the `restrict` qualifier to this QualType.
845 void addRestrict() {
846 addFastQualifiers(Qualifiers::Restrict);
847 }
848 QualType withRestrict() const {
849 return withFastQualifiers(Qualifiers::Restrict);
850 }
851
852 QualType withCVRQualifiers(unsigned CVR) const {
853 return withFastQualifiers(CVR);
854 }
855
856 void addFastQualifiers(unsigned TQs) {
857 assert(!(TQs & ~Qualifiers::FastMask)((!(TQs & ~Qualifiers::FastMask) && "non-fast qualifier bits set in mask!"
) ? static_cast<void> (0) : __assert_fail ("!(TQs & ~Qualifiers::FastMask) && \"non-fast qualifier bits set in mask!\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 858, __PRETTY_FUNCTION__))
858 && "non-fast qualifier bits set in mask!")((!(TQs & ~Qualifiers::FastMask) && "non-fast qualifier bits set in mask!"
) ? static_cast<void> (0) : __assert_fail ("!(TQs & ~Qualifiers::FastMask) && \"non-fast qualifier bits set in mask!\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 858, __PRETTY_FUNCTION__))
;
859 Value.setInt(Value.getInt() | TQs);
860 }
861
862 void removeLocalConst();
863 void removeLocalVolatile();
864 void removeLocalRestrict();
865 void removeLocalCVRQualifiers(unsigned Mask);
866
867 void removeLocalFastQualifiers() { Value.setInt(0); }
868 void removeLocalFastQualifiers(unsigned Mask) {
869 assert(!(Mask & ~Qualifiers::FastMask) && "mask has non-fast qualifiers")((!(Mask & ~Qualifiers::FastMask) && "mask has non-fast qualifiers"
) ? static_cast<void> (0) : __assert_fail ("!(Mask & ~Qualifiers::FastMask) && \"mask has non-fast qualifiers\""
, "/build/llvm-toolchain-snapshot-12~++20201026111116+d3205bbca3e/clang/include/clang/AST/Type.h"
, 869, __PRETTY_FUNCTION__))
;
870 Value.setInt(Value.getInt() & ~Mask);
871 }
872
873 // Creates a type with the given qualifiers in addition to any
874 // qualifiers already on this type.
875 QualType withFastQualifiers(unsigned TQs) const {
876 QualType T = *this;
877 T.addFastQualifiers(TQs);
878 return T;
879 }
880
881 // Creates a type with exactly the given fast qualifiers, removing
882 // any existing fast qualifiers.
883 QualType withExactLocalFastQualifiers(unsigned TQs) const {
884 return withoutLocalFastQualifiers().withFastQualifiers(TQs);
885 }
886
887 // Removes fast qualifiers, but leaves any extended qualifiers in place.
888 QualType withoutLocalFastQualifiers() const {
889 QualType T = *this;
890 T.removeLocalFastQualifiers();
891 return T;
892 }
893
894 QualType getCanonicalType() const;
895
896 /// Return this type with all of the instance-specific qualifiers
897 /// removed, but without removing any qualifiers that may have been applied
898 /// through typedefs.
899 QualType getLocalUnqualifiedType() const { return QualType(getTypePtr(), 0); }
900
901 /// Retrieve the unqualified variant of the given type,
902 /// removing as little sugar as possible.
903 ///
904 /// This routine looks through various kinds of sugar to find the
905 /// least-desugared type that is unqualified. For example, given:
906 ///
907 /// \code
908 /// typedef int Integer;
909 /// typedef const Integer CInteger;
910 /// typedef CInteger DifferenceType;
911 /// \endcode
912 ///
913 /// Executing \c getUnqualifiedType() on the type \c DifferenceType will
914 /// desugar until we hit the type \c Integer, which has no qualifiers on it.
915 ///
916 /// The resulting type might still be qualified if it's sugar for an array
917 /// type. To strip qualifiers even from within a sugared array type, use
918 /// ASTContext::getUnqualifiedArrayType.
919 inline QualType getUnqualifiedType() const;
920
921 /// Retrieve the unqualified variant of the given type, removing as little
922 /// sugar as possible.
923 ///
924 /// Like getUnqualifiedType(), but also returns the set of
925 /// qualifiers that were built up.
926 ///
927 /// The resulting type might still be qualified if it's sugar for an array
928 /// type. To strip qualifiers even from within a sugared array type, use
929 /// ASTContext::getUnqualifiedArrayType.
930 inline SplitQualType getSplitUnqualifiedType() const;
931
932 /// Determine whether this type is more qualified than the other
933 /// given type, requiring exact equality for non-CVR qualifiers.
934 bool isMoreQualifiedThan(QualType Other) const;
935
936 /// Determine whether this type is at least as qualified as the other
937 /// given type, requiring exact equality for non-CVR qualifiers.
938 bool isAtLeastAsQualifiedAs(QualType Other) const;
939
940 QualType getNonReferenceType() const;
941
942 /// Determine the type of a (typically non-lvalue) expression with the
943 /// specified result type.
944 ///
945 /// This routine should be used for expressions for which the return type is
946 /// explicitly specified (e.g., in a cast or call) and isn't necessarily
947 /// an lvalue. It removes a top-level reference (since there are no
948 /// expressions of reference type) and deletes top-level cvr-qualifiers
949 /// from non-class types (in C++) or all types (in C).
950 QualType getNonLValueExprType(const ASTContext &Context) const;
951
952 /// Remove an outer pack expansion type (if any) from this type. Used as part
953 /// of converting the type of a declaration to the type of an expression that
954 /// references that expression. It's meaningless for an expression to have a
955 /// pack expansion type.
956 QualType getNonPackExpansionType() const;
957
958 /// Return the specified type with any "sugar" removed from
959 /// the type. This takes off typedefs, typeof's etc. If the outer level of
960