File: | tools/clang/lib/CodeGen/CGExprScalar.cpp |
Warning: | line 2698, column 24 Called C++ object pointer is null |
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1 | //===--- CGExprScalar.cpp - Emit LLVM Code for Scalar Exprs ---------------===// | |||
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 contains code to emit Expr nodes with scalar LLVM types as LLVM code. | |||
10 | // | |||
11 | //===----------------------------------------------------------------------===// | |||
12 | ||||
13 | #include "CGCXXABI.h" | |||
14 | #include "CGCleanup.h" | |||
15 | #include "CGDebugInfo.h" | |||
16 | #include "CGObjCRuntime.h" | |||
17 | #include "CodeGenFunction.h" | |||
18 | #include "CodeGenModule.h" | |||
19 | #include "ConstantEmitter.h" | |||
20 | #include "TargetInfo.h" | |||
21 | #include "clang/AST/ASTContext.h" | |||
22 | #include "clang/AST/DeclObjC.h" | |||
23 | #include "clang/AST/Expr.h" | |||
24 | #include "clang/AST/RecordLayout.h" | |||
25 | #include "clang/AST/StmtVisitor.h" | |||
26 | #include "clang/Basic/CodeGenOptions.h" | |||
27 | #include "clang/Basic/FixedPoint.h" | |||
28 | #include "clang/Basic/TargetInfo.h" | |||
29 | #include "llvm/ADT/Optional.h" | |||
30 | #include "llvm/IR/CFG.h" | |||
31 | #include "llvm/IR/Constants.h" | |||
32 | #include "llvm/IR/DataLayout.h" | |||
33 | #include "llvm/IR/Function.h" | |||
34 | #include "llvm/IR/GetElementPtrTypeIterator.h" | |||
35 | #include "llvm/IR/GlobalVariable.h" | |||
36 | #include "llvm/IR/Intrinsics.h" | |||
37 | #include "llvm/IR/Module.h" | |||
38 | #include <cstdarg> | |||
39 | ||||
40 | using namespace clang; | |||
41 | using namespace CodeGen; | |||
42 | using llvm::Value; | |||
43 | ||||
44 | //===----------------------------------------------------------------------===// | |||
45 | // Scalar Expression Emitter | |||
46 | //===----------------------------------------------------------------------===// | |||
47 | ||||
48 | namespace { | |||
49 | ||||
50 | /// Determine whether the given binary operation may overflow. | |||
51 | /// Sets \p Result to the value of the operation for BO_Add, BO_Sub, BO_Mul, | |||
52 | /// and signed BO_{Div,Rem}. For these opcodes, and for unsigned BO_{Div,Rem}, | |||
53 | /// the returned overflow check is precise. The returned value is 'true' for | |||
54 | /// all other opcodes, to be conservative. | |||
55 | bool mayHaveIntegerOverflow(llvm::ConstantInt *LHS, llvm::ConstantInt *RHS, | |||
56 | BinaryOperator::Opcode Opcode, bool Signed, | |||
57 | llvm::APInt &Result) { | |||
58 | // Assume overflow is possible, unless we can prove otherwise. | |||
59 | bool Overflow = true; | |||
60 | const auto &LHSAP = LHS->getValue(); | |||
61 | const auto &RHSAP = RHS->getValue(); | |||
62 | if (Opcode == BO_Add) { | |||
63 | if (Signed) | |||
64 | Result = LHSAP.sadd_ov(RHSAP, Overflow); | |||
65 | else | |||
66 | Result = LHSAP.uadd_ov(RHSAP, Overflow); | |||
67 | } else if (Opcode == BO_Sub) { | |||
68 | if (Signed) | |||
69 | Result = LHSAP.ssub_ov(RHSAP, Overflow); | |||
70 | else | |||
71 | Result = LHSAP.usub_ov(RHSAP, Overflow); | |||
72 | } else if (Opcode == BO_Mul) { | |||
73 | if (Signed) | |||
74 | Result = LHSAP.smul_ov(RHSAP, Overflow); | |||
75 | else | |||
76 | Result = LHSAP.umul_ov(RHSAP, Overflow); | |||
77 | } else if (Opcode == BO_Div || Opcode == BO_Rem) { | |||
78 | if (Signed && !RHS->isZero()) | |||
79 | Result = LHSAP.sdiv_ov(RHSAP, Overflow); | |||
80 | else | |||
81 | return false; | |||
82 | } | |||
83 | return Overflow; | |||
84 | } | |||
85 | ||||
86 | struct BinOpInfo { | |||
87 | Value *LHS; | |||
88 | Value *RHS; | |||
89 | QualType Ty; // Computation Type. | |||
90 | BinaryOperator::Opcode Opcode; // Opcode of BinOp to perform | |||
91 | FPOptions FPFeatures; | |||
92 | const Expr *E; // Entire expr, for error unsupported. May not be binop. | |||
93 | ||||
94 | /// Check if the binop can result in integer overflow. | |||
95 | bool mayHaveIntegerOverflow() const { | |||
96 | // Without constant input, we can't rule out overflow. | |||
97 | auto *LHSCI = dyn_cast<llvm::ConstantInt>(LHS); | |||
98 | auto *RHSCI = dyn_cast<llvm::ConstantInt>(RHS); | |||
99 | if (!LHSCI || !RHSCI) | |||
100 | return true; | |||
101 | ||||
102 | llvm::APInt Result; | |||
103 | return ::mayHaveIntegerOverflow( | |||
104 | LHSCI, RHSCI, Opcode, Ty->hasSignedIntegerRepresentation(), Result); | |||
105 | } | |||
106 | ||||
107 | /// Check if the binop computes a division or a remainder. | |||
108 | bool isDivremOp() const { | |||
109 | return Opcode == BO_Div || Opcode == BO_Rem || Opcode == BO_DivAssign || | |||
110 | Opcode == BO_RemAssign; | |||
111 | } | |||
112 | ||||
113 | /// Check if the binop can result in an integer division by zero. | |||
114 | bool mayHaveIntegerDivisionByZero() const { | |||
115 | if (isDivremOp()) | |||
116 | if (auto *CI = dyn_cast<llvm::ConstantInt>(RHS)) | |||
117 | return CI->isZero(); | |||
118 | return true; | |||
119 | } | |||
120 | ||||
121 | /// Check if the binop can result in a float division by zero. | |||
122 | bool mayHaveFloatDivisionByZero() const { | |||
123 | if (isDivremOp()) | |||
124 | if (auto *CFP = dyn_cast<llvm::ConstantFP>(RHS)) | |||
125 | return CFP->isZero(); | |||
126 | return true; | |||
127 | } | |||
128 | ||||
129 | /// Check if either operand is a fixed point type or integer type, with at | |||
130 | /// least one being a fixed point type. In any case, this | |||
131 | /// operation did not follow usual arithmetic conversion and both operands may | |||
132 | /// not be the same. | |||
133 | bool isFixedPointBinOp() const { | |||
134 | // We cannot simply check the result type since comparison operations return | |||
135 | // an int. | |||
136 | if (const auto *BinOp = dyn_cast<BinaryOperator>(E)) { | |||
137 | QualType LHSType = BinOp->getLHS()->getType(); | |||
138 | QualType RHSType = BinOp->getRHS()->getType(); | |||
139 | return LHSType->isFixedPointType() || RHSType->isFixedPointType(); | |||
140 | } | |||
141 | return false; | |||
142 | } | |||
143 | }; | |||
144 | ||||
145 | static bool MustVisitNullValue(const Expr *E) { | |||
146 | // If a null pointer expression's type is the C++0x nullptr_t, then | |||
147 | // it's not necessarily a simple constant and it must be evaluated | |||
148 | // for its potential side effects. | |||
149 | return E->getType()->isNullPtrType(); | |||
150 | } | |||
151 | ||||
152 | /// If \p E is a widened promoted integer, get its base (unpromoted) type. | |||
153 | static llvm::Optional<QualType> getUnwidenedIntegerType(const ASTContext &Ctx, | |||
154 | const Expr *E) { | |||
155 | const Expr *Base = E->IgnoreImpCasts(); | |||
156 | if (E == Base) | |||
157 | return llvm::None; | |||
158 | ||||
159 | QualType BaseTy = Base->getType(); | |||
160 | if (!BaseTy->isPromotableIntegerType() || | |||
161 | Ctx.getTypeSize(BaseTy) >= Ctx.getTypeSize(E->getType())) | |||
162 | return llvm::None; | |||
163 | ||||
164 | return BaseTy; | |||
165 | } | |||
166 | ||||
167 | /// Check if \p E is a widened promoted integer. | |||
168 | static bool IsWidenedIntegerOp(const ASTContext &Ctx, const Expr *E) { | |||
169 | return getUnwidenedIntegerType(Ctx, E).hasValue(); | |||
170 | } | |||
171 | ||||
172 | /// Check if we can skip the overflow check for \p Op. | |||
173 | static bool CanElideOverflowCheck(const ASTContext &Ctx, const BinOpInfo &Op) { | |||
174 | assert((isa<UnaryOperator>(Op.E) || isa<BinaryOperator>(Op.E)) &&(((isa<UnaryOperator>(Op.E) || isa<BinaryOperator> (Op.E)) && "Expected a unary or binary operator") ? static_cast <void> (0) : __assert_fail ("(isa<UnaryOperator>(Op.E) || isa<BinaryOperator>(Op.E)) && \"Expected a unary or binary operator\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 175, __PRETTY_FUNCTION__)) | |||
175 | "Expected a unary or binary operator")(((isa<UnaryOperator>(Op.E) || isa<BinaryOperator> (Op.E)) && "Expected a unary or binary operator") ? static_cast <void> (0) : __assert_fail ("(isa<UnaryOperator>(Op.E) || isa<BinaryOperator>(Op.E)) && \"Expected a unary or binary operator\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 175, __PRETTY_FUNCTION__)); | |||
176 | ||||
177 | // If the binop has constant inputs and we can prove there is no overflow, | |||
178 | // we can elide the overflow check. | |||
179 | if (!Op.mayHaveIntegerOverflow()) | |||
180 | return true; | |||
181 | ||||
182 | // If a unary op has a widened operand, the op cannot overflow. | |||
183 | if (const auto *UO = dyn_cast<UnaryOperator>(Op.E)) | |||
184 | return !UO->canOverflow(); | |||
185 | ||||
186 | // We usually don't need overflow checks for binops with widened operands. | |||
187 | // Multiplication with promoted unsigned operands is a special case. | |||
188 | const auto *BO = cast<BinaryOperator>(Op.E); | |||
189 | auto OptionalLHSTy = getUnwidenedIntegerType(Ctx, BO->getLHS()); | |||
190 | if (!OptionalLHSTy) | |||
191 | return false; | |||
192 | ||||
193 | auto OptionalRHSTy = getUnwidenedIntegerType(Ctx, BO->getRHS()); | |||
194 | if (!OptionalRHSTy) | |||
195 | return false; | |||
196 | ||||
197 | QualType LHSTy = *OptionalLHSTy; | |||
198 | QualType RHSTy = *OptionalRHSTy; | |||
199 | ||||
200 | // This is the simple case: binops without unsigned multiplication, and with | |||
201 | // widened operands. No overflow check is needed here. | |||
202 | if ((Op.Opcode != BO_Mul && Op.Opcode != BO_MulAssign) || | |||
203 | !LHSTy->isUnsignedIntegerType() || !RHSTy->isUnsignedIntegerType()) | |||
204 | return true; | |||
205 | ||||
206 | // For unsigned multiplication the overflow check can be elided if either one | |||
207 | // of the unpromoted types are less than half the size of the promoted type. | |||
208 | unsigned PromotedSize = Ctx.getTypeSize(Op.E->getType()); | |||
209 | return (2 * Ctx.getTypeSize(LHSTy)) < PromotedSize || | |||
210 | (2 * Ctx.getTypeSize(RHSTy)) < PromotedSize; | |||
211 | } | |||
212 | ||||
213 | /// Update the FastMathFlags of LLVM IR from the FPOptions in LangOptions. | |||
214 | static void updateFastMathFlags(llvm::FastMathFlags &FMF, | |||
215 | FPOptions FPFeatures) { | |||
216 | FMF.setAllowContract(FPFeatures.allowFPContractAcrossStatement()); | |||
217 | } | |||
218 | ||||
219 | /// Propagate fast-math flags from \p Op to the instruction in \p V. | |||
220 | static Value *propagateFMFlags(Value *V, const BinOpInfo &Op) { | |||
221 | if (auto *I = dyn_cast<llvm::Instruction>(V)) { | |||
222 | llvm::FastMathFlags FMF = I->getFastMathFlags(); | |||
223 | updateFastMathFlags(FMF, Op.FPFeatures); | |||
224 | I->setFastMathFlags(FMF); | |||
225 | } | |||
226 | return V; | |||
227 | } | |||
228 | ||||
229 | class ScalarExprEmitter | |||
230 | : public StmtVisitor<ScalarExprEmitter, Value*> { | |||
231 | CodeGenFunction &CGF; | |||
232 | CGBuilderTy &Builder; | |||
233 | bool IgnoreResultAssign; | |||
234 | llvm::LLVMContext &VMContext; | |||
235 | public: | |||
236 | ||||
237 | ScalarExprEmitter(CodeGenFunction &cgf, bool ira=false) | |||
238 | : CGF(cgf), Builder(CGF.Builder), IgnoreResultAssign(ira), | |||
239 | VMContext(cgf.getLLVMContext()) { | |||
240 | } | |||
241 | ||||
242 | //===--------------------------------------------------------------------===// | |||
243 | // Utilities | |||
244 | //===--------------------------------------------------------------------===// | |||
245 | ||||
246 | bool TestAndClearIgnoreResultAssign() { | |||
247 | bool I = IgnoreResultAssign; | |||
248 | IgnoreResultAssign = false; | |||
249 | return I; | |||
250 | } | |||
251 | ||||
252 | llvm::Type *ConvertType(QualType T) { return CGF.ConvertType(T); } | |||
253 | LValue EmitLValue(const Expr *E) { return CGF.EmitLValue(E); } | |||
254 | LValue EmitCheckedLValue(const Expr *E, CodeGenFunction::TypeCheckKind TCK) { | |||
255 | return CGF.EmitCheckedLValue(E, TCK); | |||
256 | } | |||
257 | ||||
258 | void EmitBinOpCheck(ArrayRef<std::pair<Value *, SanitizerMask>> Checks, | |||
259 | const BinOpInfo &Info); | |||
260 | ||||
261 | Value *EmitLoadOfLValue(LValue LV, SourceLocation Loc) { | |||
262 | return CGF.EmitLoadOfLValue(LV, Loc).getScalarVal(); | |||
263 | } | |||
264 | ||||
265 | void EmitLValueAlignmentAssumption(const Expr *E, Value *V) { | |||
266 | const AlignValueAttr *AVAttr = nullptr; | |||
267 | if (const auto *DRE = dyn_cast<DeclRefExpr>(E)) { | |||
268 | const ValueDecl *VD = DRE->getDecl(); | |||
269 | ||||
270 | if (VD->getType()->isReferenceType()) { | |||
271 | if (const auto *TTy = | |||
272 | dyn_cast<TypedefType>(VD->getType().getNonReferenceType())) | |||
273 | AVAttr = TTy->getDecl()->getAttr<AlignValueAttr>(); | |||
274 | } else { | |||
275 | // Assumptions for function parameters are emitted at the start of the | |||
276 | // function, so there is no need to repeat that here, | |||
277 | // unless the alignment-assumption sanitizer is enabled, | |||
278 | // then we prefer the assumption over alignment attribute | |||
279 | // on IR function param. | |||
280 | if (isa<ParmVarDecl>(VD) && !CGF.SanOpts.has(SanitizerKind::Alignment)) | |||
281 | return; | |||
282 | ||||
283 | AVAttr = VD->getAttr<AlignValueAttr>(); | |||
284 | } | |||
285 | } | |||
286 | ||||
287 | if (!AVAttr) | |||
288 | if (const auto *TTy = | |||
289 | dyn_cast<TypedefType>(E->getType())) | |||
290 | AVAttr = TTy->getDecl()->getAttr<AlignValueAttr>(); | |||
291 | ||||
292 | if (!AVAttr) | |||
293 | return; | |||
294 | ||||
295 | Value *AlignmentValue = CGF.EmitScalarExpr(AVAttr->getAlignment()); | |||
296 | llvm::ConstantInt *AlignmentCI = cast<llvm::ConstantInt>(AlignmentValue); | |||
297 | CGF.EmitAlignmentAssumption(V, E, AVAttr->getLocation(), | |||
298 | AlignmentCI->getZExtValue()); | |||
299 | } | |||
300 | ||||
301 | /// EmitLoadOfLValue - Given an expression with complex type that represents a | |||
302 | /// value l-value, this method emits the address of the l-value, then loads | |||
303 | /// and returns the result. | |||
304 | Value *EmitLoadOfLValue(const Expr *E) { | |||
305 | Value *V = EmitLoadOfLValue(EmitCheckedLValue(E, CodeGenFunction::TCK_Load), | |||
306 | E->getExprLoc()); | |||
307 | ||||
308 | EmitLValueAlignmentAssumption(E, V); | |||
309 | return V; | |||
310 | } | |||
311 | ||||
312 | /// EmitConversionToBool - Convert the specified expression value to a | |||
313 | /// boolean (i1) truth value. This is equivalent to "Val != 0". | |||
314 | Value *EmitConversionToBool(Value *Src, QualType DstTy); | |||
315 | ||||
316 | /// Emit a check that a conversion from a floating-point type does not | |||
317 | /// overflow. | |||
318 | void EmitFloatConversionCheck(Value *OrigSrc, QualType OrigSrcType, | |||
319 | Value *Src, QualType SrcType, QualType DstType, | |||
320 | llvm::Type *DstTy, SourceLocation Loc); | |||
321 | ||||
322 | /// Known implicit conversion check kinds. | |||
323 | /// Keep in sync with the enum of the same name in ubsan_handlers.h | |||
324 | enum ImplicitConversionCheckKind : unsigned char { | |||
325 | ICCK_IntegerTruncation = 0, // Legacy, was only used by clang 7. | |||
326 | ICCK_UnsignedIntegerTruncation = 1, | |||
327 | ICCK_SignedIntegerTruncation = 2, | |||
328 | ICCK_IntegerSignChange = 3, | |||
329 | ICCK_SignedIntegerTruncationOrSignChange = 4, | |||
330 | }; | |||
331 | ||||
332 | /// Emit a check that an [implicit] truncation of an integer does not | |||
333 | /// discard any bits. It is not UB, so we use the value after truncation. | |||
334 | void EmitIntegerTruncationCheck(Value *Src, QualType SrcType, Value *Dst, | |||
335 | QualType DstType, SourceLocation Loc); | |||
336 | ||||
337 | /// Emit a check that an [implicit] conversion of an integer does not change | |||
338 | /// the sign of the value. It is not UB, so we use the value after conversion. | |||
339 | /// NOTE: Src and Dst may be the exact same value! (point to the same thing) | |||
340 | void EmitIntegerSignChangeCheck(Value *Src, QualType SrcType, Value *Dst, | |||
341 | QualType DstType, SourceLocation Loc); | |||
342 | ||||
343 | /// Emit a conversion from the specified type to the specified destination | |||
344 | /// type, both of which are LLVM scalar types. | |||
345 | struct ScalarConversionOpts { | |||
346 | bool TreatBooleanAsSigned; | |||
347 | bool EmitImplicitIntegerTruncationChecks; | |||
348 | bool EmitImplicitIntegerSignChangeChecks; | |||
349 | ||||
350 | ScalarConversionOpts() | |||
351 | : TreatBooleanAsSigned(false), | |||
352 | EmitImplicitIntegerTruncationChecks(false), | |||
353 | EmitImplicitIntegerSignChangeChecks(false) {} | |||
354 | ||||
355 | ScalarConversionOpts(clang::SanitizerSet SanOpts) | |||
356 | : TreatBooleanAsSigned(false), | |||
357 | EmitImplicitIntegerTruncationChecks( | |||
358 | SanOpts.hasOneOf(SanitizerKind::ImplicitIntegerTruncation)), | |||
359 | EmitImplicitIntegerSignChangeChecks( | |||
360 | SanOpts.has(SanitizerKind::ImplicitIntegerSignChange)) {} | |||
361 | }; | |||
362 | Value * | |||
363 | EmitScalarConversion(Value *Src, QualType SrcTy, QualType DstTy, | |||
364 | SourceLocation Loc, | |||
365 | ScalarConversionOpts Opts = ScalarConversionOpts()); | |||
366 | ||||
367 | /// Convert between either a fixed point and other fixed point or fixed point | |||
368 | /// and an integer. | |||
369 | Value *EmitFixedPointConversion(Value *Src, QualType SrcTy, QualType DstTy, | |||
370 | SourceLocation Loc); | |||
371 | Value *EmitFixedPointConversion(Value *Src, FixedPointSemantics &SrcFixedSema, | |||
372 | FixedPointSemantics &DstFixedSema, | |||
373 | SourceLocation Loc, | |||
374 | bool DstIsInteger = false); | |||
375 | ||||
376 | /// Emit a conversion from the specified complex type to the specified | |||
377 | /// destination type, where the destination type is an LLVM scalar type. | |||
378 | Value *EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src, | |||
379 | QualType SrcTy, QualType DstTy, | |||
380 | SourceLocation Loc); | |||
381 | ||||
382 | /// EmitNullValue - Emit a value that corresponds to null for the given type. | |||
383 | Value *EmitNullValue(QualType Ty); | |||
384 | ||||
385 | /// EmitFloatToBoolConversion - Perform an FP to boolean conversion. | |||
386 | Value *EmitFloatToBoolConversion(Value *V) { | |||
387 | // Compare against 0.0 for fp scalars. | |||
388 | llvm::Value *Zero = llvm::Constant::getNullValue(V->getType()); | |||
389 | return Builder.CreateFCmpUNE(V, Zero, "tobool"); | |||
390 | } | |||
391 | ||||
392 | /// EmitPointerToBoolConversion - Perform a pointer to boolean conversion. | |||
393 | Value *EmitPointerToBoolConversion(Value *V, QualType QT) { | |||
394 | Value *Zero = CGF.CGM.getNullPointer(cast<llvm::PointerType>(V->getType()), QT); | |||
395 | ||||
396 | return Builder.CreateICmpNE(V, Zero, "tobool"); | |||
397 | } | |||
398 | ||||
399 | Value *EmitIntToBoolConversion(Value *V) { | |||
400 | // Because of the type rules of C, we often end up computing a | |||
401 | // logical value, then zero extending it to int, then wanting it | |||
402 | // as a logical value again. Optimize this common case. | |||
403 | if (llvm::ZExtInst *ZI = dyn_cast<llvm::ZExtInst>(V)) { | |||
404 | if (ZI->getOperand(0)->getType() == Builder.getInt1Ty()) { | |||
405 | Value *Result = ZI->getOperand(0); | |||
406 | // If there aren't any more uses, zap the instruction to save space. | |||
407 | // Note that there can be more uses, for example if this | |||
408 | // is the result of an assignment. | |||
409 | if (ZI->use_empty()) | |||
410 | ZI->eraseFromParent(); | |||
411 | return Result; | |||
412 | } | |||
413 | } | |||
414 | ||||
415 | return Builder.CreateIsNotNull(V, "tobool"); | |||
416 | } | |||
417 | ||||
418 | //===--------------------------------------------------------------------===// | |||
419 | // Visitor Methods | |||
420 | //===--------------------------------------------------------------------===// | |||
421 | ||||
422 | Value *Visit(Expr *E) { | |||
423 | ApplyDebugLocation DL(CGF, E); | |||
424 | return StmtVisitor<ScalarExprEmitter, Value*>::Visit(E); | |||
425 | } | |||
426 | ||||
427 | Value *VisitStmt(Stmt *S) { | |||
428 | S->dump(CGF.getContext().getSourceManager()); | |||
429 | llvm_unreachable("Stmt can't have complex result type!")::llvm::llvm_unreachable_internal("Stmt can't have complex result type!" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 429); | |||
430 | } | |||
431 | Value *VisitExpr(Expr *S); | |||
432 | ||||
433 | Value *VisitConstantExpr(ConstantExpr *E) { | |||
434 | return Visit(E->getSubExpr()); | |||
435 | } | |||
436 | Value *VisitParenExpr(ParenExpr *PE) { | |||
437 | return Visit(PE->getSubExpr()); | |||
438 | } | |||
439 | Value *VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E) { | |||
440 | return Visit(E->getReplacement()); | |||
441 | } | |||
442 | Value *VisitGenericSelectionExpr(GenericSelectionExpr *GE) { | |||
443 | return Visit(GE->getResultExpr()); | |||
444 | } | |||
445 | Value *VisitCoawaitExpr(CoawaitExpr *S) { | |||
446 | return CGF.EmitCoawaitExpr(*S).getScalarVal(); | |||
447 | } | |||
448 | Value *VisitCoyieldExpr(CoyieldExpr *S) { | |||
449 | return CGF.EmitCoyieldExpr(*S).getScalarVal(); | |||
450 | } | |||
451 | Value *VisitUnaryCoawait(const UnaryOperator *E) { | |||
452 | return Visit(E->getSubExpr()); | |||
453 | } | |||
454 | ||||
455 | // Leaves. | |||
456 | Value *VisitIntegerLiteral(const IntegerLiteral *E) { | |||
457 | return Builder.getInt(E->getValue()); | |||
458 | } | |||
459 | Value *VisitFixedPointLiteral(const FixedPointLiteral *E) { | |||
460 | return Builder.getInt(E->getValue()); | |||
461 | } | |||
462 | Value *VisitFloatingLiteral(const FloatingLiteral *E) { | |||
463 | return llvm::ConstantFP::get(VMContext, E->getValue()); | |||
464 | } | |||
465 | Value *VisitCharacterLiteral(const CharacterLiteral *E) { | |||
466 | return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue()); | |||
467 | } | |||
468 | Value *VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) { | |||
469 | return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue()); | |||
470 | } | |||
471 | Value *VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) { | |||
472 | return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue()); | |||
473 | } | |||
474 | Value *VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) { | |||
475 | return EmitNullValue(E->getType()); | |||
476 | } | |||
477 | Value *VisitGNUNullExpr(const GNUNullExpr *E) { | |||
478 | return EmitNullValue(E->getType()); | |||
479 | } | |||
480 | Value *VisitOffsetOfExpr(OffsetOfExpr *E); | |||
481 | Value *VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E); | |||
482 | Value *VisitAddrLabelExpr(const AddrLabelExpr *E) { | |||
483 | llvm::Value *V = CGF.GetAddrOfLabel(E->getLabel()); | |||
484 | return Builder.CreateBitCast(V, ConvertType(E->getType())); | |||
485 | } | |||
486 | ||||
487 | Value *VisitSizeOfPackExpr(SizeOfPackExpr *E) { | |||
488 | return llvm::ConstantInt::get(ConvertType(E->getType()),E->getPackLength()); | |||
489 | } | |||
490 | ||||
491 | Value *VisitPseudoObjectExpr(PseudoObjectExpr *E) { | |||
492 | return CGF.EmitPseudoObjectRValue(E).getScalarVal(); | |||
493 | } | |||
494 | ||||
495 | Value *VisitOpaqueValueExpr(OpaqueValueExpr *E) { | |||
496 | if (E->isGLValue()) | |||
497 | return EmitLoadOfLValue(CGF.getOrCreateOpaqueLValueMapping(E), | |||
498 | E->getExprLoc()); | |||
499 | ||||
500 | // Otherwise, assume the mapping is the scalar directly. | |||
501 | return CGF.getOrCreateOpaqueRValueMapping(E).getScalarVal(); | |||
502 | } | |||
503 | ||||
504 | // l-values. | |||
505 | Value *VisitDeclRefExpr(DeclRefExpr *E) { | |||
506 | if (CodeGenFunction::ConstantEmission Constant = CGF.tryEmitAsConstant(E)) | |||
507 | return CGF.emitScalarConstant(Constant, E); | |||
508 | return EmitLoadOfLValue(E); | |||
509 | } | |||
510 | ||||
511 | Value *VisitObjCSelectorExpr(ObjCSelectorExpr *E) { | |||
512 | return CGF.EmitObjCSelectorExpr(E); | |||
513 | } | |||
514 | Value *VisitObjCProtocolExpr(ObjCProtocolExpr *E) { | |||
515 | return CGF.EmitObjCProtocolExpr(E); | |||
516 | } | |||
517 | Value *VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { | |||
518 | return EmitLoadOfLValue(E); | |||
519 | } | |||
520 | Value *VisitObjCMessageExpr(ObjCMessageExpr *E) { | |||
521 | if (E->getMethodDecl() && | |||
522 | E->getMethodDecl()->getReturnType()->isReferenceType()) | |||
523 | return EmitLoadOfLValue(E); | |||
524 | return CGF.EmitObjCMessageExpr(E).getScalarVal(); | |||
525 | } | |||
526 | ||||
527 | Value *VisitObjCIsaExpr(ObjCIsaExpr *E) { | |||
528 | LValue LV = CGF.EmitObjCIsaExpr(E); | |||
529 | Value *V = CGF.EmitLoadOfLValue(LV, E->getExprLoc()).getScalarVal(); | |||
530 | return V; | |||
531 | } | |||
532 | ||||
533 | Value *VisitObjCAvailabilityCheckExpr(ObjCAvailabilityCheckExpr *E) { | |||
534 | VersionTuple Version = E->getVersion(); | |||
535 | ||||
536 | // If we're checking for a platform older than our minimum deployment | |||
537 | // target, we can fold the check away. | |||
538 | if (Version <= CGF.CGM.getTarget().getPlatformMinVersion()) | |||
539 | return llvm::ConstantInt::get(Builder.getInt1Ty(), 1); | |||
540 | ||||
541 | Optional<unsigned> Min = Version.getMinor(), SMin = Version.getSubminor(); | |||
542 | llvm::Value *Args[] = { | |||
543 | llvm::ConstantInt::get(CGF.CGM.Int32Ty, Version.getMajor()), | |||
544 | llvm::ConstantInt::get(CGF.CGM.Int32Ty, Min ? *Min : 0), | |||
545 | llvm::ConstantInt::get(CGF.CGM.Int32Ty, SMin ? *SMin : 0), | |||
546 | }; | |||
547 | ||||
548 | return CGF.EmitBuiltinAvailable(Args); | |||
549 | } | |||
550 | ||||
551 | Value *VisitArraySubscriptExpr(ArraySubscriptExpr *E); | |||
552 | Value *VisitShuffleVectorExpr(ShuffleVectorExpr *E); | |||
553 | Value *VisitConvertVectorExpr(ConvertVectorExpr *E); | |||
554 | Value *VisitMemberExpr(MemberExpr *E); | |||
555 | Value *VisitExtVectorElementExpr(Expr *E) { return EmitLoadOfLValue(E); } | |||
556 | Value *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { | |||
557 | return EmitLoadOfLValue(E); | |||
558 | } | |||
559 | ||||
560 | Value *VisitInitListExpr(InitListExpr *E); | |||
561 | ||||
562 | Value *VisitArrayInitIndexExpr(ArrayInitIndexExpr *E) { | |||
563 | assert(CGF.getArrayInitIndex() &&((CGF.getArrayInitIndex() && "ArrayInitIndexExpr not inside an ArrayInitLoopExpr?" ) ? static_cast<void> (0) : __assert_fail ("CGF.getArrayInitIndex() && \"ArrayInitIndexExpr not inside an ArrayInitLoopExpr?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 564, __PRETTY_FUNCTION__)) | |||
564 | "ArrayInitIndexExpr not inside an ArrayInitLoopExpr?")((CGF.getArrayInitIndex() && "ArrayInitIndexExpr not inside an ArrayInitLoopExpr?" ) ? static_cast<void> (0) : __assert_fail ("CGF.getArrayInitIndex() && \"ArrayInitIndexExpr not inside an ArrayInitLoopExpr?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 564, __PRETTY_FUNCTION__)); | |||
565 | return CGF.getArrayInitIndex(); | |||
566 | } | |||
567 | ||||
568 | Value *VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) { | |||
569 | return EmitNullValue(E->getType()); | |||
570 | } | |||
571 | Value *VisitExplicitCastExpr(ExplicitCastExpr *E) { | |||
572 | CGF.CGM.EmitExplicitCastExprType(E, &CGF); | |||
573 | return VisitCastExpr(E); | |||
574 | } | |||
575 | Value *VisitCastExpr(CastExpr *E); | |||
576 | ||||
577 | Value *VisitCallExpr(const CallExpr *E) { | |||
578 | if (E->getCallReturnType(CGF.getContext())->isReferenceType()) | |||
579 | return EmitLoadOfLValue(E); | |||
580 | ||||
581 | Value *V = CGF.EmitCallExpr(E).getScalarVal(); | |||
582 | ||||
583 | EmitLValueAlignmentAssumption(E, V); | |||
584 | return V; | |||
585 | } | |||
586 | ||||
587 | Value *VisitStmtExpr(const StmtExpr *E); | |||
588 | ||||
589 | // Unary Operators. | |||
590 | Value *VisitUnaryPostDec(const UnaryOperator *E) { | |||
591 | LValue LV = EmitLValue(E->getSubExpr()); | |||
592 | return EmitScalarPrePostIncDec(E, LV, false, false); | |||
593 | } | |||
594 | Value *VisitUnaryPostInc(const UnaryOperator *E) { | |||
595 | LValue LV = EmitLValue(E->getSubExpr()); | |||
596 | return EmitScalarPrePostIncDec(E, LV, true, false); | |||
597 | } | |||
598 | Value *VisitUnaryPreDec(const UnaryOperator *E) { | |||
599 | LValue LV = EmitLValue(E->getSubExpr()); | |||
600 | return EmitScalarPrePostIncDec(E, LV, false, true); | |||
601 | } | |||
602 | Value *VisitUnaryPreInc(const UnaryOperator *E) { | |||
603 | LValue LV = EmitLValue(E->getSubExpr()); | |||
604 | return EmitScalarPrePostIncDec(E, LV, true, true); | |||
605 | } | |||
606 | ||||
607 | llvm::Value *EmitIncDecConsiderOverflowBehavior(const UnaryOperator *E, | |||
608 | llvm::Value *InVal, | |||
609 | bool IsInc); | |||
610 | ||||
611 | llvm::Value *EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV, | |||
612 | bool isInc, bool isPre); | |||
613 | ||||
614 | ||||
615 | Value *VisitUnaryAddrOf(const UnaryOperator *E) { | |||
616 | if (isa<MemberPointerType>(E->getType())) // never sugared | |||
617 | return CGF.CGM.getMemberPointerConstant(E); | |||
618 | ||||
619 | return EmitLValue(E->getSubExpr()).getPointer(); | |||
620 | } | |||
621 | Value *VisitUnaryDeref(const UnaryOperator *E) { | |||
622 | if (E->getType()->isVoidType()) | |||
623 | return Visit(E->getSubExpr()); // the actual value should be unused | |||
624 | return EmitLoadOfLValue(E); | |||
625 | } | |||
626 | Value *VisitUnaryPlus(const UnaryOperator *E) { | |||
627 | // This differs from gcc, though, most likely due to a bug in gcc. | |||
628 | TestAndClearIgnoreResultAssign(); | |||
629 | return Visit(E->getSubExpr()); | |||
630 | } | |||
631 | Value *VisitUnaryMinus (const UnaryOperator *E); | |||
632 | Value *VisitUnaryNot (const UnaryOperator *E); | |||
633 | Value *VisitUnaryLNot (const UnaryOperator *E); | |||
634 | Value *VisitUnaryReal (const UnaryOperator *E); | |||
635 | Value *VisitUnaryImag (const UnaryOperator *E); | |||
636 | Value *VisitUnaryExtension(const UnaryOperator *E) { | |||
637 | return Visit(E->getSubExpr()); | |||
638 | } | |||
639 | ||||
640 | // C++ | |||
641 | Value *VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E) { | |||
642 | return EmitLoadOfLValue(E); | |||
643 | } | |||
644 | Value *VisitSourceLocExpr(SourceLocExpr *SLE) { | |||
645 | auto &Ctx = CGF.getContext(); | |||
646 | APValue Evaluated = | |||
647 | SLE->EvaluateInContext(Ctx, CGF.CurSourceLocExprScope.getDefaultExpr()); | |||
648 | return ConstantEmitter(CGF.CGM, &CGF) | |||
649 | .emitAbstract(SLE->getLocation(), Evaluated, SLE->getType()); | |||
650 | } | |||
651 | ||||
652 | Value *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { | |||
653 | CodeGenFunction::CXXDefaultArgExprScope Scope(CGF, DAE); | |||
654 | return Visit(DAE->getExpr()); | |||
655 | } | |||
656 | Value *VisitCXXDefaultInitExpr(CXXDefaultInitExpr *DIE) { | |||
657 | CodeGenFunction::CXXDefaultInitExprScope Scope(CGF, DIE); | |||
658 | return Visit(DIE->getExpr()); | |||
659 | } | |||
660 | Value *VisitCXXThisExpr(CXXThisExpr *TE) { | |||
661 | return CGF.LoadCXXThis(); | |||
662 | } | |||
663 | ||||
664 | Value *VisitExprWithCleanups(ExprWithCleanups *E); | |||
665 | Value *VisitCXXNewExpr(const CXXNewExpr *E) { | |||
666 | return CGF.EmitCXXNewExpr(E); | |||
667 | } | |||
668 | Value *VisitCXXDeleteExpr(const CXXDeleteExpr *E) { | |||
669 | CGF.EmitCXXDeleteExpr(E); | |||
670 | return nullptr; | |||
671 | } | |||
672 | ||||
673 | Value *VisitTypeTraitExpr(const TypeTraitExpr *E) { | |||
674 | return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue()); | |||
675 | } | |||
676 | ||||
677 | Value *VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) { | |||
678 | return llvm::ConstantInt::get(Builder.getInt32Ty(), E->getValue()); | |||
679 | } | |||
680 | ||||
681 | Value *VisitExpressionTraitExpr(const ExpressionTraitExpr *E) { | |||
682 | return llvm::ConstantInt::get(Builder.getInt1Ty(), E->getValue()); | |||
683 | } | |||
684 | ||||
685 | Value *VisitCXXPseudoDestructorExpr(const CXXPseudoDestructorExpr *E) { | |||
686 | // C++ [expr.pseudo]p1: | |||
687 | // The result shall only be used as the operand for the function call | |||
688 | // operator (), and the result of such a call has type void. The only | |||
689 | // effect is the evaluation of the postfix-expression before the dot or | |||
690 | // arrow. | |||
691 | CGF.EmitScalarExpr(E->getBase()); | |||
692 | return nullptr; | |||
693 | } | |||
694 | ||||
695 | Value *VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) { | |||
696 | return EmitNullValue(E->getType()); | |||
697 | } | |||
698 | ||||
699 | Value *VisitCXXThrowExpr(const CXXThrowExpr *E) { | |||
700 | CGF.EmitCXXThrowExpr(E); | |||
701 | return nullptr; | |||
702 | } | |||
703 | ||||
704 | Value *VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) { | |||
705 | return Builder.getInt1(E->getValue()); | |||
706 | } | |||
707 | ||||
708 | // Binary Operators. | |||
709 | Value *EmitMul(const BinOpInfo &Ops) { | |||
710 | if (Ops.Ty->isSignedIntegerOrEnumerationType()) { | |||
711 | switch (CGF.getLangOpts().getSignedOverflowBehavior()) { | |||
712 | case LangOptions::SOB_Defined: | |||
713 | return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul"); | |||
714 | case LangOptions::SOB_Undefined: | |||
715 | if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) | |||
716 | return Builder.CreateNSWMul(Ops.LHS, Ops.RHS, "mul"); | |||
717 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
718 | case LangOptions::SOB_Trapping: | |||
719 | if (CanElideOverflowCheck(CGF.getContext(), Ops)) | |||
720 | return Builder.CreateNSWMul(Ops.LHS, Ops.RHS, "mul"); | |||
721 | return EmitOverflowCheckedBinOp(Ops); | |||
722 | } | |||
723 | } | |||
724 | ||||
725 | if (Ops.Ty->isUnsignedIntegerType() && | |||
726 | CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow) && | |||
727 | !CanElideOverflowCheck(CGF.getContext(), Ops)) | |||
728 | return EmitOverflowCheckedBinOp(Ops); | |||
729 | ||||
730 | if (Ops.LHS->getType()->isFPOrFPVectorTy()) { | |||
731 | Value *V = Builder.CreateFMul(Ops.LHS, Ops.RHS, "mul"); | |||
732 | return propagateFMFlags(V, Ops); | |||
733 | } | |||
734 | return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul"); | |||
735 | } | |||
736 | /// Create a binary op that checks for overflow. | |||
737 | /// Currently only supports +, - and *. | |||
738 | Value *EmitOverflowCheckedBinOp(const BinOpInfo &Ops); | |||
739 | ||||
740 | // Check for undefined division and modulus behaviors. | |||
741 | void EmitUndefinedBehaviorIntegerDivAndRemCheck(const BinOpInfo &Ops, | |||
742 | llvm::Value *Zero,bool isDiv); | |||
743 | // Common helper for getting how wide LHS of shift is. | |||
744 | static Value *GetWidthMinusOneValue(Value* LHS,Value* RHS); | |||
745 | Value *EmitDiv(const BinOpInfo &Ops); | |||
746 | Value *EmitRem(const BinOpInfo &Ops); | |||
747 | Value *EmitAdd(const BinOpInfo &Ops); | |||
748 | Value *EmitSub(const BinOpInfo &Ops); | |||
749 | Value *EmitShl(const BinOpInfo &Ops); | |||
750 | Value *EmitShr(const BinOpInfo &Ops); | |||
751 | Value *EmitAnd(const BinOpInfo &Ops) { | |||
752 | return Builder.CreateAnd(Ops.LHS, Ops.RHS, "and"); | |||
753 | } | |||
754 | Value *EmitXor(const BinOpInfo &Ops) { | |||
755 | return Builder.CreateXor(Ops.LHS, Ops.RHS, "xor"); | |||
756 | } | |||
757 | Value *EmitOr (const BinOpInfo &Ops) { | |||
758 | return Builder.CreateOr(Ops.LHS, Ops.RHS, "or"); | |||
759 | } | |||
760 | ||||
761 | // Helper functions for fixed point binary operations. | |||
762 | Value *EmitFixedPointBinOp(const BinOpInfo &Ops); | |||
763 | ||||
764 | BinOpInfo EmitBinOps(const BinaryOperator *E); | |||
765 | LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E, | |||
766 | Value *(ScalarExprEmitter::*F)(const BinOpInfo &), | |||
767 | Value *&Result); | |||
768 | ||||
769 | Value *EmitCompoundAssign(const CompoundAssignOperator *E, | |||
770 | Value *(ScalarExprEmitter::*F)(const BinOpInfo &)); | |||
771 | ||||
772 | // Binary operators and binary compound assignment operators. | |||
773 | #define HANDLEBINOP(OP) \ | |||
774 | Value *VisitBin ## OP(const BinaryOperator *E) { \ | |||
775 | return Emit ## OP(EmitBinOps(E)); \ | |||
776 | } \ | |||
777 | Value *VisitBin ## OP ## Assign(const CompoundAssignOperator *E) { \ | |||
778 | return EmitCompoundAssign(E, &ScalarExprEmitter::Emit ## OP); \ | |||
779 | } | |||
780 | HANDLEBINOP(Mul) | |||
781 | HANDLEBINOP(Div) | |||
782 | HANDLEBINOP(Rem) | |||
783 | HANDLEBINOP(Add) | |||
784 | HANDLEBINOP(Sub) | |||
785 | HANDLEBINOP(Shl) | |||
786 | HANDLEBINOP(Shr) | |||
787 | HANDLEBINOP(And) | |||
788 | HANDLEBINOP(Xor) | |||
789 | HANDLEBINOP(Or) | |||
790 | #undef HANDLEBINOP | |||
791 | ||||
792 | // Comparisons. | |||
793 | Value *EmitCompare(const BinaryOperator *E, llvm::CmpInst::Predicate UICmpOpc, | |||
794 | llvm::CmpInst::Predicate SICmpOpc, | |||
795 | llvm::CmpInst::Predicate FCmpOpc); | |||
796 | #define VISITCOMP(CODE, UI, SI, FP) \ | |||
797 | Value *VisitBin##CODE(const BinaryOperator *E) { \ | |||
798 | return EmitCompare(E, llvm::ICmpInst::UI, llvm::ICmpInst::SI, \ | |||
799 | llvm::FCmpInst::FP); } | |||
800 | VISITCOMP(LT, ICMP_ULT, ICMP_SLT, FCMP_OLT) | |||
801 | VISITCOMP(GT, ICMP_UGT, ICMP_SGT, FCMP_OGT) | |||
802 | VISITCOMP(LE, ICMP_ULE, ICMP_SLE, FCMP_OLE) | |||
803 | VISITCOMP(GE, ICMP_UGE, ICMP_SGE, FCMP_OGE) | |||
804 | VISITCOMP(EQ, ICMP_EQ , ICMP_EQ , FCMP_OEQ) | |||
805 | VISITCOMP(NE, ICMP_NE , ICMP_NE , FCMP_UNE) | |||
806 | #undef VISITCOMP | |||
807 | ||||
808 | Value *VisitBinAssign (const BinaryOperator *E); | |||
809 | ||||
810 | Value *VisitBinLAnd (const BinaryOperator *E); | |||
811 | Value *VisitBinLOr (const BinaryOperator *E); | |||
812 | Value *VisitBinComma (const BinaryOperator *E); | |||
813 | ||||
814 | Value *VisitBinPtrMemD(const Expr *E) { return EmitLoadOfLValue(E); } | |||
815 | Value *VisitBinPtrMemI(const Expr *E) { return EmitLoadOfLValue(E); } | |||
816 | ||||
817 | // Other Operators. | |||
818 | Value *VisitBlockExpr(const BlockExpr *BE); | |||
819 | Value *VisitAbstractConditionalOperator(const AbstractConditionalOperator *); | |||
820 | Value *VisitChooseExpr(ChooseExpr *CE); | |||
821 | Value *VisitVAArgExpr(VAArgExpr *VE); | |||
822 | Value *VisitObjCStringLiteral(const ObjCStringLiteral *E) { | |||
823 | return CGF.EmitObjCStringLiteral(E); | |||
824 | } | |||
825 | Value *VisitObjCBoxedExpr(ObjCBoxedExpr *E) { | |||
826 | return CGF.EmitObjCBoxedExpr(E); | |||
827 | } | |||
828 | Value *VisitObjCArrayLiteral(ObjCArrayLiteral *E) { | |||
829 | return CGF.EmitObjCArrayLiteral(E); | |||
830 | } | |||
831 | Value *VisitObjCDictionaryLiteral(ObjCDictionaryLiteral *E) { | |||
832 | return CGF.EmitObjCDictionaryLiteral(E); | |||
833 | } | |||
834 | Value *VisitAsTypeExpr(AsTypeExpr *CE); | |||
835 | Value *VisitAtomicExpr(AtomicExpr *AE); | |||
836 | }; | |||
837 | } // end anonymous namespace. | |||
838 | ||||
839 | //===----------------------------------------------------------------------===// | |||
840 | // Utilities | |||
841 | //===----------------------------------------------------------------------===// | |||
842 | ||||
843 | /// EmitConversionToBool - Convert the specified expression value to a | |||
844 | /// boolean (i1) truth value. This is equivalent to "Val != 0". | |||
845 | Value *ScalarExprEmitter::EmitConversionToBool(Value *Src, QualType SrcType) { | |||
846 | assert(SrcType.isCanonical() && "EmitScalarConversion strips typedefs")((SrcType.isCanonical() && "EmitScalarConversion strips typedefs" ) ? static_cast<void> (0) : __assert_fail ("SrcType.isCanonical() && \"EmitScalarConversion strips typedefs\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 846, __PRETTY_FUNCTION__)); | |||
847 | ||||
848 | if (SrcType->isRealFloatingType()) | |||
849 | return EmitFloatToBoolConversion(Src); | |||
850 | ||||
851 | if (const MemberPointerType *MPT = dyn_cast<MemberPointerType>(SrcType)) | |||
852 | return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, Src, MPT); | |||
853 | ||||
854 | assert((SrcType->isIntegerType() || isa<llvm::PointerType>(Src->getType())) &&(((SrcType->isIntegerType() || isa<llvm::PointerType> (Src->getType())) && "Unknown scalar type to convert" ) ? static_cast<void> (0) : __assert_fail ("(SrcType->isIntegerType() || isa<llvm::PointerType>(Src->getType())) && \"Unknown scalar type to convert\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 855, __PRETTY_FUNCTION__)) | |||
855 | "Unknown scalar type to convert")(((SrcType->isIntegerType() || isa<llvm::PointerType> (Src->getType())) && "Unknown scalar type to convert" ) ? static_cast<void> (0) : __assert_fail ("(SrcType->isIntegerType() || isa<llvm::PointerType>(Src->getType())) && \"Unknown scalar type to convert\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 855, __PRETTY_FUNCTION__)); | |||
856 | ||||
857 | if (isa<llvm::IntegerType>(Src->getType())) | |||
858 | return EmitIntToBoolConversion(Src); | |||
859 | ||||
860 | assert(isa<llvm::PointerType>(Src->getType()))((isa<llvm::PointerType>(Src->getType())) ? static_cast <void> (0) : __assert_fail ("isa<llvm::PointerType>(Src->getType())" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 860, __PRETTY_FUNCTION__)); | |||
861 | return EmitPointerToBoolConversion(Src, SrcType); | |||
862 | } | |||
863 | ||||
864 | void ScalarExprEmitter::EmitFloatConversionCheck( | |||
865 | Value *OrigSrc, QualType OrigSrcType, Value *Src, QualType SrcType, | |||
866 | QualType DstType, llvm::Type *DstTy, SourceLocation Loc) { | |||
867 | assert(SrcType->isFloatingType() && "not a conversion from floating point")((SrcType->isFloatingType() && "not a conversion from floating point" ) ? static_cast<void> (0) : __assert_fail ("SrcType->isFloatingType() && \"not a conversion from floating point\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 867, __PRETTY_FUNCTION__)); | |||
868 | if (!isa<llvm::IntegerType>(DstTy)) | |||
869 | return; | |||
870 | ||||
871 | CodeGenFunction::SanitizerScope SanScope(&CGF); | |||
872 | using llvm::APFloat; | |||
873 | using llvm::APSInt; | |||
874 | ||||
875 | llvm::Value *Check = nullptr; | |||
876 | const llvm::fltSemantics &SrcSema = | |||
877 | CGF.getContext().getFloatTypeSemantics(OrigSrcType); | |||
878 | ||||
879 | // Floating-point to integer. This has undefined behavior if the source is | |||
880 | // +-Inf, NaN, or doesn't fit into the destination type (after truncation | |||
881 | // to an integer). | |||
882 | unsigned Width = CGF.getContext().getIntWidth(DstType); | |||
883 | bool Unsigned = DstType->isUnsignedIntegerOrEnumerationType(); | |||
884 | ||||
885 | APSInt Min = APSInt::getMinValue(Width, Unsigned); | |||
886 | APFloat MinSrc(SrcSema, APFloat::uninitialized); | |||
887 | if (MinSrc.convertFromAPInt(Min, !Unsigned, APFloat::rmTowardZero) & | |||
888 | APFloat::opOverflow) | |||
889 | // Don't need an overflow check for lower bound. Just check for | |||
890 | // -Inf/NaN. | |||
891 | MinSrc = APFloat::getInf(SrcSema, true); | |||
892 | else | |||
893 | // Find the largest value which is too small to represent (before | |||
894 | // truncation toward zero). | |||
895 | MinSrc.subtract(APFloat(SrcSema, 1), APFloat::rmTowardNegative); | |||
896 | ||||
897 | APSInt Max = APSInt::getMaxValue(Width, Unsigned); | |||
898 | APFloat MaxSrc(SrcSema, APFloat::uninitialized); | |||
899 | if (MaxSrc.convertFromAPInt(Max, !Unsigned, APFloat::rmTowardZero) & | |||
900 | APFloat::opOverflow) | |||
901 | // Don't need an overflow check for upper bound. Just check for | |||
902 | // +Inf/NaN. | |||
903 | MaxSrc = APFloat::getInf(SrcSema, false); | |||
904 | else | |||
905 | // Find the smallest value which is too large to represent (before | |||
906 | // truncation toward zero). | |||
907 | MaxSrc.add(APFloat(SrcSema, 1), APFloat::rmTowardPositive); | |||
908 | ||||
909 | // If we're converting from __half, convert the range to float to match | |||
910 | // the type of src. | |||
911 | if (OrigSrcType->isHalfType()) { | |||
912 | const llvm::fltSemantics &Sema = | |||
913 | CGF.getContext().getFloatTypeSemantics(SrcType); | |||
914 | bool IsInexact; | |||
915 | MinSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact); | |||
916 | MaxSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact); | |||
917 | } | |||
918 | ||||
919 | llvm::Value *GE = | |||
920 | Builder.CreateFCmpOGT(Src, llvm::ConstantFP::get(VMContext, MinSrc)); | |||
921 | llvm::Value *LE = | |||
922 | Builder.CreateFCmpOLT(Src, llvm::ConstantFP::get(VMContext, MaxSrc)); | |||
923 | Check = Builder.CreateAnd(GE, LE); | |||
924 | ||||
925 | llvm::Constant *StaticArgs[] = {CGF.EmitCheckSourceLocation(Loc), | |||
926 | CGF.EmitCheckTypeDescriptor(OrigSrcType), | |||
927 | CGF.EmitCheckTypeDescriptor(DstType)}; | |||
928 | CGF.EmitCheck(std::make_pair(Check, SanitizerKind::FloatCastOverflow), | |||
929 | SanitizerHandler::FloatCastOverflow, StaticArgs, OrigSrc); | |||
930 | } | |||
931 | ||||
932 | // Should be called within CodeGenFunction::SanitizerScope RAII scope. | |||
933 | // Returns 'i1 false' when the truncation Src -> Dst was lossy. | |||
934 | static std::pair<ScalarExprEmitter::ImplicitConversionCheckKind, | |||
935 | std::pair<llvm::Value *, SanitizerMask>> | |||
936 | EmitIntegerTruncationCheckHelper(Value *Src, QualType SrcType, Value *Dst, | |||
937 | QualType DstType, CGBuilderTy &Builder) { | |||
938 | llvm::Type *SrcTy = Src->getType(); | |||
939 | llvm::Type *DstTy = Dst->getType(); | |||
940 | (void)DstTy; // Only used in assert() | |||
941 | ||||
942 | // This should be truncation of integral types. | |||
943 | assert(Src != Dst)((Src != Dst) ? static_cast<void> (0) : __assert_fail ( "Src != Dst", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 943, __PRETTY_FUNCTION__)); | |||
944 | assert(SrcTy->getScalarSizeInBits() > Dst->getType()->getScalarSizeInBits())((SrcTy->getScalarSizeInBits() > Dst->getType()-> getScalarSizeInBits()) ? static_cast<void> (0) : __assert_fail ("SrcTy->getScalarSizeInBits() > Dst->getType()->getScalarSizeInBits()" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 944, __PRETTY_FUNCTION__)); | |||
945 | assert(isa<llvm::IntegerType>(SrcTy) && isa<llvm::IntegerType>(DstTy) &&((isa<llvm::IntegerType>(SrcTy) && isa<llvm:: IntegerType>(DstTy) && "non-integer llvm type") ? static_cast <void> (0) : __assert_fail ("isa<llvm::IntegerType>(SrcTy) && isa<llvm::IntegerType>(DstTy) && \"non-integer llvm type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 946, __PRETTY_FUNCTION__)) | |||
946 | "non-integer llvm type")((isa<llvm::IntegerType>(SrcTy) && isa<llvm:: IntegerType>(DstTy) && "non-integer llvm type") ? static_cast <void> (0) : __assert_fail ("isa<llvm::IntegerType>(SrcTy) && isa<llvm::IntegerType>(DstTy) && \"non-integer llvm type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 946, __PRETTY_FUNCTION__)); | |||
947 | ||||
948 | bool SrcSigned = SrcType->isSignedIntegerOrEnumerationType(); | |||
949 | bool DstSigned = DstType->isSignedIntegerOrEnumerationType(); | |||
950 | ||||
951 | // If both (src and dst) types are unsigned, then it's an unsigned truncation. | |||
952 | // Else, it is a signed truncation. | |||
953 | ScalarExprEmitter::ImplicitConversionCheckKind Kind; | |||
954 | SanitizerMask Mask; | |||
955 | if (!SrcSigned && !DstSigned) { | |||
956 | Kind = ScalarExprEmitter::ICCK_UnsignedIntegerTruncation; | |||
957 | Mask = SanitizerKind::ImplicitUnsignedIntegerTruncation; | |||
958 | } else { | |||
959 | Kind = ScalarExprEmitter::ICCK_SignedIntegerTruncation; | |||
960 | Mask = SanitizerKind::ImplicitSignedIntegerTruncation; | |||
961 | } | |||
962 | ||||
963 | llvm::Value *Check = nullptr; | |||
964 | // 1. Extend the truncated value back to the same width as the Src. | |||
965 | Check = Builder.CreateIntCast(Dst, SrcTy, DstSigned, "anyext"); | |||
966 | // 2. Equality-compare with the original source value | |||
967 | Check = Builder.CreateICmpEQ(Check, Src, "truncheck"); | |||
968 | // If the comparison result is 'i1 false', then the truncation was lossy. | |||
969 | return std::make_pair(Kind, std::make_pair(Check, Mask)); | |||
970 | } | |||
971 | ||||
972 | void ScalarExprEmitter::EmitIntegerTruncationCheck(Value *Src, QualType SrcType, | |||
973 | Value *Dst, QualType DstType, | |||
974 | SourceLocation Loc) { | |||
975 | if (!CGF.SanOpts.hasOneOf(SanitizerKind::ImplicitIntegerTruncation)) | |||
976 | return; | |||
977 | ||||
978 | // We only care about int->int conversions here. | |||
979 | // We ignore conversions to/from pointer and/or bool. | |||
980 | if (!(SrcType->isIntegerType() && DstType->isIntegerType())) | |||
981 | return; | |||
982 | ||||
983 | unsigned SrcBits = Src->getType()->getScalarSizeInBits(); | |||
984 | unsigned DstBits = Dst->getType()->getScalarSizeInBits(); | |||
985 | // This must be truncation. Else we do not care. | |||
986 | if (SrcBits <= DstBits) | |||
987 | return; | |||
988 | ||||
989 | assert(!DstType->isBooleanType() && "we should not get here with booleans.")((!DstType->isBooleanType() && "we should not get here with booleans." ) ? static_cast<void> (0) : __assert_fail ("!DstType->isBooleanType() && \"we should not get here with booleans.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 989, __PRETTY_FUNCTION__)); | |||
990 | ||||
991 | // If the integer sign change sanitizer is enabled, | |||
992 | // and we are truncating from larger unsigned type to smaller signed type, | |||
993 | // let that next sanitizer deal with it. | |||
994 | bool SrcSigned = SrcType->isSignedIntegerOrEnumerationType(); | |||
995 | bool DstSigned = DstType->isSignedIntegerOrEnumerationType(); | |||
996 | if (CGF.SanOpts.has(SanitizerKind::ImplicitIntegerSignChange) && | |||
997 | (!SrcSigned && DstSigned)) | |||
998 | return; | |||
999 | ||||
1000 | CodeGenFunction::SanitizerScope SanScope(&CGF); | |||
1001 | ||||
1002 | std::pair<ScalarExprEmitter::ImplicitConversionCheckKind, | |||
1003 | std::pair<llvm::Value *, SanitizerMask>> | |||
1004 | Check = | |||
1005 | EmitIntegerTruncationCheckHelper(Src, SrcType, Dst, DstType, Builder); | |||
1006 | // If the comparison result is 'i1 false', then the truncation was lossy. | |||
1007 | ||||
1008 | // Do we care about this type of truncation? | |||
1009 | if (!CGF.SanOpts.has(Check.second.second)) | |||
1010 | return; | |||
1011 | ||||
1012 | llvm::Constant *StaticArgs[] = { | |||
1013 | CGF.EmitCheckSourceLocation(Loc), CGF.EmitCheckTypeDescriptor(SrcType), | |||
1014 | CGF.EmitCheckTypeDescriptor(DstType), | |||
1015 | llvm::ConstantInt::get(Builder.getInt8Ty(), Check.first)}; | |||
1016 | CGF.EmitCheck(Check.second, SanitizerHandler::ImplicitConversion, StaticArgs, | |||
1017 | {Src, Dst}); | |||
1018 | } | |||
1019 | ||||
1020 | // Should be called within CodeGenFunction::SanitizerScope RAII scope. | |||
1021 | // Returns 'i1 false' when the conversion Src -> Dst changed the sign. | |||
1022 | static std::pair<ScalarExprEmitter::ImplicitConversionCheckKind, | |||
1023 | std::pair<llvm::Value *, SanitizerMask>> | |||
1024 | EmitIntegerSignChangeCheckHelper(Value *Src, QualType SrcType, Value *Dst, | |||
1025 | QualType DstType, CGBuilderTy &Builder) { | |||
1026 | llvm::Type *SrcTy = Src->getType(); | |||
1027 | llvm::Type *DstTy = Dst->getType(); | |||
1028 | ||||
1029 | assert(isa<llvm::IntegerType>(SrcTy) && isa<llvm::IntegerType>(DstTy) &&((isa<llvm::IntegerType>(SrcTy) && isa<llvm:: IntegerType>(DstTy) && "non-integer llvm type") ? static_cast <void> (0) : __assert_fail ("isa<llvm::IntegerType>(SrcTy) && isa<llvm::IntegerType>(DstTy) && \"non-integer llvm type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1030, __PRETTY_FUNCTION__)) | |||
1030 | "non-integer llvm type")((isa<llvm::IntegerType>(SrcTy) && isa<llvm:: IntegerType>(DstTy) && "non-integer llvm type") ? static_cast <void> (0) : __assert_fail ("isa<llvm::IntegerType>(SrcTy) && isa<llvm::IntegerType>(DstTy) && \"non-integer llvm type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1030, __PRETTY_FUNCTION__)); | |||
1031 | ||||
1032 | bool SrcSigned = SrcType->isSignedIntegerOrEnumerationType(); | |||
1033 | bool DstSigned = DstType->isSignedIntegerOrEnumerationType(); | |||
1034 | (void)SrcSigned; // Only used in assert() | |||
1035 | (void)DstSigned; // Only used in assert() | |||
1036 | unsigned SrcBits = SrcTy->getScalarSizeInBits(); | |||
1037 | unsigned DstBits = DstTy->getScalarSizeInBits(); | |||
1038 | (void)SrcBits; // Only used in assert() | |||
1039 | (void)DstBits; // Only used in assert() | |||
1040 | ||||
1041 | assert(((SrcBits != DstBits) || (SrcSigned != DstSigned)) &&((((SrcBits != DstBits) || (SrcSigned != DstSigned)) && "either the widths should be different, or the signednesses." ) ? static_cast<void> (0) : __assert_fail ("((SrcBits != DstBits) || (SrcSigned != DstSigned)) && \"either the widths should be different, or the signednesses.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1042, __PRETTY_FUNCTION__)) | |||
1042 | "either the widths should be different, or the signednesses.")((((SrcBits != DstBits) || (SrcSigned != DstSigned)) && "either the widths should be different, or the signednesses." ) ? static_cast<void> (0) : __assert_fail ("((SrcBits != DstBits) || (SrcSigned != DstSigned)) && \"either the widths should be different, or the signednesses.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1042, __PRETTY_FUNCTION__)); | |||
1043 | ||||
1044 | // NOTE: zero value is considered to be non-negative. | |||
1045 | auto EmitIsNegativeTest = [&Builder](Value *V, QualType VType, | |||
1046 | const char *Name) -> Value * { | |||
1047 | // Is this value a signed type? | |||
1048 | bool VSigned = VType->isSignedIntegerOrEnumerationType(); | |||
1049 | llvm::Type *VTy = V->getType(); | |||
1050 | if (!VSigned) { | |||
1051 | // If the value is unsigned, then it is never negative. | |||
1052 | // FIXME: can we encounter non-scalar VTy here? | |||
1053 | return llvm::ConstantInt::getFalse(VTy->getContext()); | |||
1054 | } | |||
1055 | // Get the zero of the same type with which we will be comparing. | |||
1056 | llvm::Constant *Zero = llvm::ConstantInt::get(VTy, 0); | |||
1057 | // %V.isnegative = icmp slt %V, 0 | |||
1058 | // I.e is %V *strictly* less than zero, does it have negative value? | |||
1059 | return Builder.CreateICmp(llvm::ICmpInst::ICMP_SLT, V, Zero, | |||
1060 | llvm::Twine(Name) + "." + V->getName() + | |||
1061 | ".negativitycheck"); | |||
1062 | }; | |||
1063 | ||||
1064 | // 1. Was the old Value negative? | |||
1065 | llvm::Value *SrcIsNegative = EmitIsNegativeTest(Src, SrcType, "src"); | |||
1066 | // 2. Is the new Value negative? | |||
1067 | llvm::Value *DstIsNegative = EmitIsNegativeTest(Dst, DstType, "dst"); | |||
1068 | // 3. Now, was the 'negativity status' preserved during the conversion? | |||
1069 | // NOTE: conversion from negative to zero is considered to change the sign. | |||
1070 | // (We want to get 'false' when the conversion changed the sign) | |||
1071 | // So we should just equality-compare the negativity statuses. | |||
1072 | llvm::Value *Check = nullptr; | |||
1073 | Check = Builder.CreateICmpEQ(SrcIsNegative, DstIsNegative, "signchangecheck"); | |||
1074 | // If the comparison result is 'false', then the conversion changed the sign. | |||
1075 | return std::make_pair( | |||
1076 | ScalarExprEmitter::ICCK_IntegerSignChange, | |||
1077 | std::make_pair(Check, SanitizerKind::ImplicitIntegerSignChange)); | |||
1078 | } | |||
1079 | ||||
1080 | void ScalarExprEmitter::EmitIntegerSignChangeCheck(Value *Src, QualType SrcType, | |||
1081 | Value *Dst, QualType DstType, | |||
1082 | SourceLocation Loc) { | |||
1083 | if (!CGF.SanOpts.has(SanitizerKind::ImplicitIntegerSignChange)) | |||
1084 | return; | |||
1085 | ||||
1086 | llvm::Type *SrcTy = Src->getType(); | |||
1087 | llvm::Type *DstTy = Dst->getType(); | |||
1088 | ||||
1089 | // We only care about int->int conversions here. | |||
1090 | // We ignore conversions to/from pointer and/or bool. | |||
1091 | if (!(SrcType->isIntegerType() && DstType->isIntegerType())) | |||
1092 | return; | |||
1093 | ||||
1094 | bool SrcSigned = SrcType->isSignedIntegerOrEnumerationType(); | |||
1095 | bool DstSigned = DstType->isSignedIntegerOrEnumerationType(); | |||
1096 | unsigned SrcBits = SrcTy->getScalarSizeInBits(); | |||
1097 | unsigned DstBits = DstTy->getScalarSizeInBits(); | |||
1098 | ||||
1099 | // Now, we do not need to emit the check in *all* of the cases. | |||
1100 | // We can avoid emitting it in some obvious cases where it would have been | |||
1101 | // dropped by the opt passes (instcombine) always anyways. | |||
1102 | // If it's a cast between effectively the same type, no check. | |||
1103 | // NOTE: this is *not* equivalent to checking the canonical types. | |||
1104 | if (SrcSigned == DstSigned && SrcBits == DstBits) | |||
1105 | return; | |||
1106 | // At least one of the values needs to have signed type. | |||
1107 | // If both are unsigned, then obviously, neither of them can be negative. | |||
1108 | if (!SrcSigned && !DstSigned) | |||
1109 | return; | |||
1110 | // If the conversion is to *larger* *signed* type, then no check is needed. | |||
1111 | // Because either sign-extension happens (so the sign will remain), | |||
1112 | // or zero-extension will happen (the sign bit will be zero.) | |||
1113 | if ((DstBits > SrcBits) && DstSigned) | |||
1114 | return; | |||
1115 | if (CGF.SanOpts.has(SanitizerKind::ImplicitSignedIntegerTruncation) && | |||
1116 | (SrcBits > DstBits) && SrcSigned) { | |||
1117 | // If the signed integer truncation sanitizer is enabled, | |||
1118 | // and this is a truncation from signed type, then no check is needed. | |||
1119 | // Because here sign change check is interchangeable with truncation check. | |||
1120 | return; | |||
1121 | } | |||
1122 | // That's it. We can't rule out any more cases with the data we have. | |||
1123 | ||||
1124 | CodeGenFunction::SanitizerScope SanScope(&CGF); | |||
1125 | ||||
1126 | std::pair<ScalarExprEmitter::ImplicitConversionCheckKind, | |||
1127 | std::pair<llvm::Value *, SanitizerMask>> | |||
1128 | Check; | |||
1129 | ||||
1130 | // Each of these checks needs to return 'false' when an issue was detected. | |||
1131 | ImplicitConversionCheckKind CheckKind; | |||
1132 | llvm::SmallVector<std::pair<llvm::Value *, SanitizerMask>, 2> Checks; | |||
1133 | // So we can 'and' all the checks together, and still get 'false', | |||
1134 | // if at least one of the checks detected an issue. | |||
1135 | ||||
1136 | Check = EmitIntegerSignChangeCheckHelper(Src, SrcType, Dst, DstType, Builder); | |||
1137 | CheckKind = Check.first; | |||
1138 | Checks.emplace_back(Check.second); | |||
1139 | ||||
1140 | if (CGF.SanOpts.has(SanitizerKind::ImplicitSignedIntegerTruncation) && | |||
1141 | (SrcBits > DstBits) && !SrcSigned && DstSigned) { | |||
1142 | // If the signed integer truncation sanitizer was enabled, | |||
1143 | // and we are truncating from larger unsigned type to smaller signed type, | |||
1144 | // let's handle the case we skipped in that check. | |||
1145 | Check = | |||
1146 | EmitIntegerTruncationCheckHelper(Src, SrcType, Dst, DstType, Builder); | |||
1147 | CheckKind = ICCK_SignedIntegerTruncationOrSignChange; | |||
1148 | Checks.emplace_back(Check.second); | |||
1149 | // If the comparison result is 'i1 false', then the truncation was lossy. | |||
1150 | } | |||
1151 | ||||
1152 | llvm::Constant *StaticArgs[] = { | |||
1153 | CGF.EmitCheckSourceLocation(Loc), CGF.EmitCheckTypeDescriptor(SrcType), | |||
1154 | CGF.EmitCheckTypeDescriptor(DstType), | |||
1155 | llvm::ConstantInt::get(Builder.getInt8Ty(), CheckKind)}; | |||
1156 | // EmitCheck() will 'and' all the checks together. | |||
1157 | CGF.EmitCheck(Checks, SanitizerHandler::ImplicitConversion, StaticArgs, | |||
1158 | {Src, Dst}); | |||
1159 | } | |||
1160 | ||||
1161 | /// Emit a conversion from the specified type to the specified destination type, | |||
1162 | /// both of which are LLVM scalar types. | |||
1163 | Value *ScalarExprEmitter::EmitScalarConversion(Value *Src, QualType SrcType, | |||
1164 | QualType DstType, | |||
1165 | SourceLocation Loc, | |||
1166 | ScalarConversionOpts Opts) { | |||
1167 | // All conversions involving fixed point types should be handled by the | |||
1168 | // EmitFixedPoint family functions. This is done to prevent bloating up this | |||
1169 | // function more, and although fixed point numbers are represented by | |||
1170 | // integers, we do not want to follow any logic that assumes they should be | |||
1171 | // treated as integers. | |||
1172 | // TODO(leonardchan): When necessary, add another if statement checking for | |||
1173 | // conversions to fixed point types from other types. | |||
1174 | if (SrcType->isFixedPointType()) { | |||
1175 | if (DstType->isBooleanType()) | |||
1176 | // It is important that we check this before checking if the dest type is | |||
1177 | // an integer because booleans are technically integer types. | |||
1178 | // We do not need to check the padding bit on unsigned types if unsigned | |||
1179 | // padding is enabled because overflow into this bit is undefined | |||
1180 | // behavior. | |||
1181 | return Builder.CreateIsNotNull(Src, "tobool"); | |||
1182 | if (DstType->isFixedPointType() || DstType->isIntegerType()) | |||
1183 | return EmitFixedPointConversion(Src, SrcType, DstType, Loc); | |||
1184 | ||||
1185 | llvm_unreachable(::llvm::llvm_unreachable_internal("Unhandled scalar conversion from a fixed point type to another type." , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1186) | |||
1186 | "Unhandled scalar conversion from a fixed point type to another type.")::llvm::llvm_unreachable_internal("Unhandled scalar conversion from a fixed point type to another type." , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1186); | |||
1187 | } else if (DstType->isFixedPointType()) { | |||
1188 | if (SrcType->isIntegerType()) | |||
1189 | // This also includes converting booleans and enums to fixed point types. | |||
1190 | return EmitFixedPointConversion(Src, SrcType, DstType, Loc); | |||
1191 | ||||
1192 | llvm_unreachable(::llvm::llvm_unreachable_internal("Unhandled scalar conversion to a fixed point type from another type." , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1193) | |||
1193 | "Unhandled scalar conversion to a fixed point type from another type.")::llvm::llvm_unreachable_internal("Unhandled scalar conversion to a fixed point type from another type." , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1193); | |||
1194 | } | |||
1195 | ||||
1196 | QualType NoncanonicalSrcType = SrcType; | |||
1197 | QualType NoncanonicalDstType = DstType; | |||
1198 | ||||
1199 | SrcType = CGF.getContext().getCanonicalType(SrcType); | |||
1200 | DstType = CGF.getContext().getCanonicalType(DstType); | |||
1201 | if (SrcType == DstType) return Src; | |||
1202 | ||||
1203 | if (DstType->isVoidType()) return nullptr; | |||
1204 | ||||
1205 | llvm::Value *OrigSrc = Src; | |||
1206 | QualType OrigSrcType = SrcType; | |||
1207 | llvm::Type *SrcTy = Src->getType(); | |||
1208 | ||||
1209 | // Handle conversions to bool first, they are special: comparisons against 0. | |||
1210 | if (DstType->isBooleanType()) | |||
1211 | return EmitConversionToBool(Src, SrcType); | |||
1212 | ||||
1213 | llvm::Type *DstTy = ConvertType(DstType); | |||
1214 | ||||
1215 | // Cast from half through float if half isn't a native type. | |||
1216 | if (SrcType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) { | |||
1217 | // Cast to FP using the intrinsic if the half type itself isn't supported. | |||
1218 | if (DstTy->isFloatingPointTy()) { | |||
1219 | if (CGF.getContext().getTargetInfo().useFP16ConversionIntrinsics()) | |||
1220 | return Builder.CreateCall( | |||
1221 | CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16, DstTy), | |||
1222 | Src); | |||
1223 | } else { | |||
1224 | // Cast to other types through float, using either the intrinsic or FPExt, | |||
1225 | // depending on whether the half type itself is supported | |||
1226 | // (as opposed to operations on half, available with NativeHalfType). | |||
1227 | if (CGF.getContext().getTargetInfo().useFP16ConversionIntrinsics()) { | |||
1228 | Src = Builder.CreateCall( | |||
1229 | CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16, | |||
1230 | CGF.CGM.FloatTy), | |||
1231 | Src); | |||
1232 | } else { | |||
1233 | Src = Builder.CreateFPExt(Src, CGF.CGM.FloatTy, "conv"); | |||
1234 | } | |||
1235 | SrcType = CGF.getContext().FloatTy; | |||
1236 | SrcTy = CGF.FloatTy; | |||
1237 | } | |||
1238 | } | |||
1239 | ||||
1240 | // Ignore conversions like int -> uint. | |||
1241 | if (SrcTy == DstTy) { | |||
1242 | if (Opts.EmitImplicitIntegerSignChangeChecks) | |||
1243 | EmitIntegerSignChangeCheck(Src, NoncanonicalSrcType, Src, | |||
1244 | NoncanonicalDstType, Loc); | |||
1245 | ||||
1246 | return Src; | |||
1247 | } | |||
1248 | ||||
1249 | // Handle pointer conversions next: pointers can only be converted to/from | |||
1250 | // other pointers and integers. Check for pointer types in terms of LLVM, as | |||
1251 | // some native types (like Obj-C id) may map to a pointer type. | |||
1252 | if (auto DstPT = dyn_cast<llvm::PointerType>(DstTy)) { | |||
1253 | // The source value may be an integer, or a pointer. | |||
1254 | if (isa<llvm::PointerType>(SrcTy)) | |||
1255 | return Builder.CreateBitCast(Src, DstTy, "conv"); | |||
1256 | ||||
1257 | assert(SrcType->isIntegerType() && "Not ptr->ptr or int->ptr conversion?")((SrcType->isIntegerType() && "Not ptr->ptr or int->ptr conversion?" ) ? static_cast<void> (0) : __assert_fail ("SrcType->isIntegerType() && \"Not ptr->ptr or int->ptr conversion?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1257, __PRETTY_FUNCTION__)); | |||
1258 | // First, convert to the correct width so that we control the kind of | |||
1259 | // extension. | |||
1260 | llvm::Type *MiddleTy = CGF.CGM.getDataLayout().getIntPtrType(DstPT); | |||
1261 | bool InputSigned = SrcType->isSignedIntegerOrEnumerationType(); | |||
1262 | llvm::Value* IntResult = | |||
1263 | Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv"); | |||
1264 | // Then, cast to pointer. | |||
1265 | return Builder.CreateIntToPtr(IntResult, DstTy, "conv"); | |||
1266 | } | |||
1267 | ||||
1268 | if (isa<llvm::PointerType>(SrcTy)) { | |||
1269 | // Must be an ptr to int cast. | |||
1270 | assert(isa<llvm::IntegerType>(DstTy) && "not ptr->int?")((isa<llvm::IntegerType>(DstTy) && "not ptr->int?" ) ? static_cast<void> (0) : __assert_fail ("isa<llvm::IntegerType>(DstTy) && \"not ptr->int?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1270, __PRETTY_FUNCTION__)); | |||
1271 | return Builder.CreatePtrToInt(Src, DstTy, "conv"); | |||
1272 | } | |||
1273 | ||||
1274 | // A scalar can be splatted to an extended vector of the same element type | |||
1275 | if (DstType->isExtVectorType() && !SrcType->isVectorType()) { | |||
1276 | // Sema should add casts to make sure that the source expression's type is | |||
1277 | // the same as the vector's element type (sans qualifiers) | |||
1278 | assert(DstType->castAs<ExtVectorType>()->getElementType().getTypePtr() ==((DstType->castAs<ExtVectorType>()->getElementType ().getTypePtr() == SrcType.getTypePtr() && "Splatted expr doesn't match with vector element type?" ) ? static_cast<void> (0) : __assert_fail ("DstType->castAs<ExtVectorType>()->getElementType().getTypePtr() == SrcType.getTypePtr() && \"Splatted expr doesn't match with vector element type?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1280, __PRETTY_FUNCTION__)) | |||
1279 | SrcType.getTypePtr() &&((DstType->castAs<ExtVectorType>()->getElementType ().getTypePtr() == SrcType.getTypePtr() && "Splatted expr doesn't match with vector element type?" ) ? static_cast<void> (0) : __assert_fail ("DstType->castAs<ExtVectorType>()->getElementType().getTypePtr() == SrcType.getTypePtr() && \"Splatted expr doesn't match with vector element type?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1280, __PRETTY_FUNCTION__)) | |||
1280 | "Splatted expr doesn't match with vector element type?")((DstType->castAs<ExtVectorType>()->getElementType ().getTypePtr() == SrcType.getTypePtr() && "Splatted expr doesn't match with vector element type?" ) ? static_cast<void> (0) : __assert_fail ("DstType->castAs<ExtVectorType>()->getElementType().getTypePtr() == SrcType.getTypePtr() && \"Splatted expr doesn't match with vector element type?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1280, __PRETTY_FUNCTION__)); | |||
1281 | ||||
1282 | // Splat the element across to all elements | |||
1283 | unsigned NumElements = DstTy->getVectorNumElements(); | |||
1284 | return Builder.CreateVectorSplat(NumElements, Src, "splat"); | |||
1285 | } | |||
1286 | ||||
1287 | if (isa<llvm::VectorType>(SrcTy) || isa<llvm::VectorType>(DstTy)) { | |||
1288 | // Allow bitcast from vector to integer/fp of the same size. | |||
1289 | unsigned SrcSize = SrcTy->getPrimitiveSizeInBits(); | |||
1290 | unsigned DstSize = DstTy->getPrimitiveSizeInBits(); | |||
1291 | if (SrcSize == DstSize) | |||
1292 | return Builder.CreateBitCast(Src, DstTy, "conv"); | |||
1293 | ||||
1294 | // Conversions between vectors of different sizes are not allowed except | |||
1295 | // when vectors of half are involved. Operations on storage-only half | |||
1296 | // vectors require promoting half vector operands to float vectors and | |||
1297 | // truncating the result, which is either an int or float vector, to a | |||
1298 | // short or half vector. | |||
1299 | ||||
1300 | // Source and destination are both expected to be vectors. | |||
1301 | llvm::Type *SrcElementTy = SrcTy->getVectorElementType(); | |||
1302 | llvm::Type *DstElementTy = DstTy->getVectorElementType(); | |||
1303 | (void)DstElementTy; | |||
1304 | ||||
1305 | assert(((SrcElementTy->isIntegerTy() &&((((SrcElementTy->isIntegerTy() && DstElementTy-> isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && "unexpected conversion between a floating-point vector and an " "integer vector") ? static_cast<void> (0) : __assert_fail ("((SrcElementTy->isIntegerTy() && DstElementTy->isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && \"unexpected conversion between a floating-point vector and an \" \"integer vector\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1310, __PRETTY_FUNCTION__)) | |||
1306 | DstElementTy->isIntegerTy()) ||((((SrcElementTy->isIntegerTy() && DstElementTy-> isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && "unexpected conversion between a floating-point vector and an " "integer vector") ? static_cast<void> (0) : __assert_fail ("((SrcElementTy->isIntegerTy() && DstElementTy->isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && \"unexpected conversion between a floating-point vector and an \" \"integer vector\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1310, __PRETTY_FUNCTION__)) | |||
1307 | (SrcElementTy->isFloatingPointTy() &&((((SrcElementTy->isIntegerTy() && DstElementTy-> isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && "unexpected conversion between a floating-point vector and an " "integer vector") ? static_cast<void> (0) : __assert_fail ("((SrcElementTy->isIntegerTy() && DstElementTy->isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && \"unexpected conversion between a floating-point vector and an \" \"integer vector\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1310, __PRETTY_FUNCTION__)) | |||
1308 | DstElementTy->isFloatingPointTy())) &&((((SrcElementTy->isIntegerTy() && DstElementTy-> isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && "unexpected conversion between a floating-point vector and an " "integer vector") ? static_cast<void> (0) : __assert_fail ("((SrcElementTy->isIntegerTy() && DstElementTy->isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && \"unexpected conversion between a floating-point vector and an \" \"integer vector\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1310, __PRETTY_FUNCTION__)) | |||
1309 | "unexpected conversion between a floating-point vector and an "((((SrcElementTy->isIntegerTy() && DstElementTy-> isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && "unexpected conversion between a floating-point vector and an " "integer vector") ? static_cast<void> (0) : __assert_fail ("((SrcElementTy->isIntegerTy() && DstElementTy->isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && \"unexpected conversion between a floating-point vector and an \" \"integer vector\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1310, __PRETTY_FUNCTION__)) | |||
1310 | "integer vector")((((SrcElementTy->isIntegerTy() && DstElementTy-> isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && "unexpected conversion between a floating-point vector and an " "integer vector") ? static_cast<void> (0) : __assert_fail ("((SrcElementTy->isIntegerTy() && DstElementTy->isIntegerTy()) || (SrcElementTy->isFloatingPointTy() && DstElementTy->isFloatingPointTy())) && \"unexpected conversion between a floating-point vector and an \" \"integer vector\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1310, __PRETTY_FUNCTION__)); | |||
1311 | ||||
1312 | // Truncate an i32 vector to an i16 vector. | |||
1313 | if (SrcElementTy->isIntegerTy()) | |||
1314 | return Builder.CreateIntCast(Src, DstTy, false, "conv"); | |||
1315 | ||||
1316 | // Truncate a float vector to a half vector. | |||
1317 | if (SrcSize > DstSize) | |||
1318 | return Builder.CreateFPTrunc(Src, DstTy, "conv"); | |||
1319 | ||||
1320 | // Promote a half vector to a float vector. | |||
1321 | return Builder.CreateFPExt(Src, DstTy, "conv"); | |||
1322 | } | |||
1323 | ||||
1324 | // Finally, we have the arithmetic types: real int/float. | |||
1325 | Value *Res = nullptr; | |||
1326 | llvm::Type *ResTy = DstTy; | |||
1327 | ||||
1328 | // An overflowing conversion has undefined behavior if either the source type | |||
1329 | // or the destination type is a floating-point type. However, we consider the | |||
1330 | // range of representable values for all floating-point types to be | |||
1331 | // [-inf,+inf], so no overflow can ever happen when the destination type is a | |||
1332 | // floating-point type. | |||
1333 | if (CGF.SanOpts.has(SanitizerKind::FloatCastOverflow) && | |||
1334 | OrigSrcType->isFloatingType()) | |||
1335 | EmitFloatConversionCheck(OrigSrc, OrigSrcType, Src, SrcType, DstType, DstTy, | |||
1336 | Loc); | |||
1337 | ||||
1338 | // Cast to half through float if half isn't a native type. | |||
1339 | if (DstType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) { | |||
1340 | // Make sure we cast in a single step if from another FP type. | |||
1341 | if (SrcTy->isFloatingPointTy()) { | |||
1342 | // Use the intrinsic if the half type itself isn't supported | |||
1343 | // (as opposed to operations on half, available with NativeHalfType). | |||
1344 | if (CGF.getContext().getTargetInfo().useFP16ConversionIntrinsics()) | |||
1345 | return Builder.CreateCall( | |||
1346 | CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16, SrcTy), Src); | |||
1347 | // If the half type is supported, just use an fptrunc. | |||
1348 | return Builder.CreateFPTrunc(Src, DstTy); | |||
1349 | } | |||
1350 | DstTy = CGF.FloatTy; | |||
1351 | } | |||
1352 | ||||
1353 | if (isa<llvm::IntegerType>(SrcTy)) { | |||
1354 | bool InputSigned = SrcType->isSignedIntegerOrEnumerationType(); | |||
1355 | if (SrcType->isBooleanType() && Opts.TreatBooleanAsSigned) { | |||
1356 | InputSigned = true; | |||
1357 | } | |||
1358 | if (isa<llvm::IntegerType>(DstTy)) | |||
1359 | Res = Builder.CreateIntCast(Src, DstTy, InputSigned, "conv"); | |||
1360 | else if (InputSigned) | |||
1361 | Res = Builder.CreateSIToFP(Src, DstTy, "conv"); | |||
1362 | else | |||
1363 | Res = Builder.CreateUIToFP(Src, DstTy, "conv"); | |||
1364 | } else if (isa<llvm::IntegerType>(DstTy)) { | |||
1365 | assert(SrcTy->isFloatingPointTy() && "Unknown real conversion")((SrcTy->isFloatingPointTy() && "Unknown real conversion" ) ? static_cast<void> (0) : __assert_fail ("SrcTy->isFloatingPointTy() && \"Unknown real conversion\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1365, __PRETTY_FUNCTION__)); | |||
1366 | if (DstType->isSignedIntegerOrEnumerationType()) | |||
1367 | Res = Builder.CreateFPToSI(Src, DstTy, "conv"); | |||
1368 | else | |||
1369 | Res = Builder.CreateFPToUI(Src, DstTy, "conv"); | |||
1370 | } else { | |||
1371 | assert(SrcTy->isFloatingPointTy() && DstTy->isFloatingPointTy() &&((SrcTy->isFloatingPointTy() && DstTy->isFloatingPointTy () && "Unknown real conversion") ? static_cast<void > (0) : __assert_fail ("SrcTy->isFloatingPointTy() && DstTy->isFloatingPointTy() && \"Unknown real conversion\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1372, __PRETTY_FUNCTION__)) | |||
1372 | "Unknown real conversion")((SrcTy->isFloatingPointTy() && DstTy->isFloatingPointTy () && "Unknown real conversion") ? static_cast<void > (0) : __assert_fail ("SrcTy->isFloatingPointTy() && DstTy->isFloatingPointTy() && \"Unknown real conversion\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1372, __PRETTY_FUNCTION__)); | |||
1373 | if (DstTy->getTypeID() < SrcTy->getTypeID()) | |||
1374 | Res = Builder.CreateFPTrunc(Src, DstTy, "conv"); | |||
1375 | else | |||
1376 | Res = Builder.CreateFPExt(Src, DstTy, "conv"); | |||
1377 | } | |||
1378 | ||||
1379 | if (DstTy != ResTy) { | |||
1380 | if (CGF.getContext().getTargetInfo().useFP16ConversionIntrinsics()) { | |||
1381 | assert(ResTy->isIntegerTy(16) && "Only half FP requires extra conversion")((ResTy->isIntegerTy(16) && "Only half FP requires extra conversion" ) ? static_cast<void> (0) : __assert_fail ("ResTy->isIntegerTy(16) && \"Only half FP requires extra conversion\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1381, __PRETTY_FUNCTION__)); | |||
1382 | Res = Builder.CreateCall( | |||
1383 | CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16, CGF.CGM.FloatTy), | |||
1384 | Res); | |||
1385 | } else { | |||
1386 | Res = Builder.CreateFPTrunc(Res, ResTy, "conv"); | |||
1387 | } | |||
1388 | } | |||
1389 | ||||
1390 | if (Opts.EmitImplicitIntegerTruncationChecks) | |||
1391 | EmitIntegerTruncationCheck(Src, NoncanonicalSrcType, Res, | |||
1392 | NoncanonicalDstType, Loc); | |||
1393 | ||||
1394 | if (Opts.EmitImplicitIntegerSignChangeChecks) | |||
1395 | EmitIntegerSignChangeCheck(Src, NoncanonicalSrcType, Res, | |||
1396 | NoncanonicalDstType, Loc); | |||
1397 | ||||
1398 | return Res; | |||
1399 | } | |||
1400 | ||||
1401 | Value *ScalarExprEmitter::EmitFixedPointConversion(Value *Src, QualType SrcTy, | |||
1402 | QualType DstTy, | |||
1403 | SourceLocation Loc) { | |||
1404 | FixedPointSemantics SrcFPSema = | |||
1405 | CGF.getContext().getFixedPointSemantics(SrcTy); | |||
1406 | FixedPointSemantics DstFPSema = | |||
1407 | CGF.getContext().getFixedPointSemantics(DstTy); | |||
1408 | return EmitFixedPointConversion(Src, SrcFPSema, DstFPSema, Loc, | |||
1409 | DstTy->isIntegerType()); | |||
1410 | } | |||
1411 | ||||
1412 | Value *ScalarExprEmitter::EmitFixedPointConversion( | |||
1413 | Value *Src, FixedPointSemantics &SrcFPSema, FixedPointSemantics &DstFPSema, | |||
1414 | SourceLocation Loc, bool DstIsInteger) { | |||
1415 | using llvm::APInt; | |||
1416 | using llvm::ConstantInt; | |||
1417 | using llvm::Value; | |||
1418 | ||||
1419 | unsigned SrcWidth = SrcFPSema.getWidth(); | |||
1420 | unsigned DstWidth = DstFPSema.getWidth(); | |||
1421 | unsigned SrcScale = SrcFPSema.getScale(); | |||
1422 | unsigned DstScale = DstFPSema.getScale(); | |||
1423 | bool SrcIsSigned = SrcFPSema.isSigned(); | |||
1424 | bool DstIsSigned = DstFPSema.isSigned(); | |||
1425 | ||||
1426 | llvm::Type *DstIntTy = Builder.getIntNTy(DstWidth); | |||
1427 | ||||
1428 | Value *Result = Src; | |||
1429 | unsigned ResultWidth = SrcWidth; | |||
1430 | ||||
1431 | // Downscale. | |||
1432 | if (DstScale < SrcScale) { | |||
1433 | // When converting to integers, we round towards zero. For negative numbers, | |||
1434 | // right shifting rounds towards negative infinity. In this case, we can | |||
1435 | // just round up before shifting. | |||
1436 | if (DstIsInteger && SrcIsSigned) { | |||
1437 | Value *Zero = llvm::Constant::getNullValue(Result->getType()); | |||
1438 | Value *IsNegative = Builder.CreateICmpSLT(Result, Zero); | |||
1439 | Value *LowBits = ConstantInt::get( | |||
1440 | CGF.getLLVMContext(), APInt::getLowBitsSet(ResultWidth, SrcScale)); | |||
1441 | Value *Rounded = Builder.CreateAdd(Result, LowBits); | |||
1442 | Result = Builder.CreateSelect(IsNegative, Rounded, Result); | |||
1443 | } | |||
1444 | ||||
1445 | Result = SrcIsSigned | |||
1446 | ? Builder.CreateAShr(Result, SrcScale - DstScale, "downscale") | |||
1447 | : Builder.CreateLShr(Result, SrcScale - DstScale, "downscale"); | |||
1448 | } | |||
1449 | ||||
1450 | if (!DstFPSema.isSaturated()) { | |||
1451 | // Resize. | |||
1452 | Result = Builder.CreateIntCast(Result, DstIntTy, SrcIsSigned, "resize"); | |||
1453 | ||||
1454 | // Upscale. | |||
1455 | if (DstScale > SrcScale) | |||
1456 | Result = Builder.CreateShl(Result, DstScale - SrcScale, "upscale"); | |||
1457 | } else { | |||
1458 | // Adjust the number of fractional bits. | |||
1459 | if (DstScale > SrcScale) { | |||
1460 | // Compare to DstWidth to prevent resizing twice. | |||
1461 | ResultWidth = std::max(SrcWidth + DstScale - SrcScale, DstWidth); | |||
1462 | llvm::Type *UpscaledTy = Builder.getIntNTy(ResultWidth); | |||
1463 | Result = Builder.CreateIntCast(Result, UpscaledTy, SrcIsSigned, "resize"); | |||
1464 | Result = Builder.CreateShl(Result, DstScale - SrcScale, "upscale"); | |||
1465 | } | |||
1466 | ||||
1467 | // Handle saturation. | |||
1468 | bool LessIntBits = DstFPSema.getIntegralBits() < SrcFPSema.getIntegralBits(); | |||
1469 | if (LessIntBits) { | |||
1470 | Value *Max = ConstantInt::get( | |||
1471 | CGF.getLLVMContext(), | |||
1472 | APFixedPoint::getMax(DstFPSema).getValue().extOrTrunc(ResultWidth)); | |||
1473 | Value *TooHigh = SrcIsSigned ? Builder.CreateICmpSGT(Result, Max) | |||
1474 | : Builder.CreateICmpUGT(Result, Max); | |||
1475 | Result = Builder.CreateSelect(TooHigh, Max, Result, "satmax"); | |||
1476 | } | |||
1477 | // Cannot overflow min to dest type if src is unsigned since all fixed | |||
1478 | // point types can cover the unsigned min of 0. | |||
1479 | if (SrcIsSigned && (LessIntBits || !DstIsSigned)) { | |||
1480 | Value *Min = ConstantInt::get( | |||
1481 | CGF.getLLVMContext(), | |||
1482 | APFixedPoint::getMin(DstFPSema).getValue().extOrTrunc(ResultWidth)); | |||
1483 | Value *TooLow = Builder.CreateICmpSLT(Result, Min); | |||
1484 | Result = Builder.CreateSelect(TooLow, Min, Result, "satmin"); | |||
1485 | } | |||
1486 | ||||
1487 | // Resize the integer part to get the final destination size. | |||
1488 | if (ResultWidth != DstWidth) | |||
1489 | Result = Builder.CreateIntCast(Result, DstIntTy, SrcIsSigned, "resize"); | |||
1490 | } | |||
1491 | return Result; | |||
1492 | } | |||
1493 | ||||
1494 | /// Emit a conversion from the specified complex type to the specified | |||
1495 | /// destination type, where the destination type is an LLVM scalar type. | |||
1496 | Value *ScalarExprEmitter::EmitComplexToScalarConversion( | |||
1497 | CodeGenFunction::ComplexPairTy Src, QualType SrcTy, QualType DstTy, | |||
1498 | SourceLocation Loc) { | |||
1499 | // Get the source element type. | |||
1500 | SrcTy = SrcTy->castAs<ComplexType>()->getElementType(); | |||
1501 | ||||
1502 | // Handle conversions to bool first, they are special: comparisons against 0. | |||
1503 | if (DstTy->isBooleanType()) { | |||
1504 | // Complex != 0 -> (Real != 0) | (Imag != 0) | |||
1505 | Src.first = EmitScalarConversion(Src.first, SrcTy, DstTy, Loc); | |||
1506 | Src.second = EmitScalarConversion(Src.second, SrcTy, DstTy, Loc); | |||
1507 | return Builder.CreateOr(Src.first, Src.second, "tobool"); | |||
1508 | } | |||
1509 | ||||
1510 | // C99 6.3.1.7p2: "When a value of complex type is converted to a real type, | |||
1511 | // the imaginary part of the complex value is discarded and the value of the | |||
1512 | // real part is converted according to the conversion rules for the | |||
1513 | // corresponding real type. | |||
1514 | return EmitScalarConversion(Src.first, SrcTy, DstTy, Loc); | |||
1515 | } | |||
1516 | ||||
1517 | Value *ScalarExprEmitter::EmitNullValue(QualType Ty) { | |||
1518 | return CGF.EmitFromMemory(CGF.CGM.EmitNullConstant(Ty), Ty); | |||
1519 | } | |||
1520 | ||||
1521 | /// Emit a sanitization check for the given "binary" operation (which | |||
1522 | /// might actually be a unary increment which has been lowered to a binary | |||
1523 | /// operation). The check passes if all values in \p Checks (which are \c i1), | |||
1524 | /// are \c true. | |||
1525 | void ScalarExprEmitter::EmitBinOpCheck( | |||
1526 | ArrayRef<std::pair<Value *, SanitizerMask>> Checks, const BinOpInfo &Info) { | |||
1527 | assert(CGF.IsSanitizerScope)((CGF.IsSanitizerScope) ? static_cast<void> (0) : __assert_fail ("CGF.IsSanitizerScope", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1527, __PRETTY_FUNCTION__)); | |||
1528 | SanitizerHandler Check; | |||
1529 | SmallVector<llvm::Constant *, 4> StaticData; | |||
1530 | SmallVector<llvm::Value *, 2> DynamicData; | |||
1531 | ||||
1532 | BinaryOperatorKind Opcode = Info.Opcode; | |||
1533 | if (BinaryOperator::isCompoundAssignmentOp(Opcode)) | |||
1534 | Opcode = BinaryOperator::getOpForCompoundAssignment(Opcode); | |||
1535 | ||||
1536 | StaticData.push_back(CGF.EmitCheckSourceLocation(Info.E->getExprLoc())); | |||
1537 | const UnaryOperator *UO = dyn_cast<UnaryOperator>(Info.E); | |||
1538 | if (UO && UO->getOpcode() == UO_Minus) { | |||
1539 | Check = SanitizerHandler::NegateOverflow; | |||
1540 | StaticData.push_back(CGF.EmitCheckTypeDescriptor(UO->getType())); | |||
1541 | DynamicData.push_back(Info.RHS); | |||
1542 | } else { | |||
1543 | if (BinaryOperator::isShiftOp(Opcode)) { | |||
1544 | // Shift LHS negative or too large, or RHS out of bounds. | |||
1545 | Check = SanitizerHandler::ShiftOutOfBounds; | |||
1546 | const BinaryOperator *BO = cast<BinaryOperator>(Info.E); | |||
1547 | StaticData.push_back( | |||
1548 | CGF.EmitCheckTypeDescriptor(BO->getLHS()->getType())); | |||
1549 | StaticData.push_back( | |||
1550 | CGF.EmitCheckTypeDescriptor(BO->getRHS()->getType())); | |||
1551 | } else if (Opcode == BO_Div || Opcode == BO_Rem) { | |||
1552 | // Divide or modulo by zero, or signed overflow (eg INT_MAX / -1). | |||
1553 | Check = SanitizerHandler::DivremOverflow; | |||
1554 | StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty)); | |||
1555 | } else { | |||
1556 | // Arithmetic overflow (+, -, *). | |||
1557 | switch (Opcode) { | |||
1558 | case BO_Add: Check = SanitizerHandler::AddOverflow; break; | |||
1559 | case BO_Sub: Check = SanitizerHandler::SubOverflow; break; | |||
1560 | case BO_Mul: Check = SanitizerHandler::MulOverflow; break; | |||
1561 | default: llvm_unreachable("unexpected opcode for bin op check")::llvm::llvm_unreachable_internal("unexpected opcode for bin op check" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1561); | |||
1562 | } | |||
1563 | StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty)); | |||
1564 | } | |||
1565 | DynamicData.push_back(Info.LHS); | |||
1566 | DynamicData.push_back(Info.RHS); | |||
1567 | } | |||
1568 | ||||
1569 | CGF.EmitCheck(Checks, Check, StaticData, DynamicData); | |||
1570 | } | |||
1571 | ||||
1572 | //===----------------------------------------------------------------------===// | |||
1573 | // Visitor Methods | |||
1574 | //===----------------------------------------------------------------------===// | |||
1575 | ||||
1576 | Value *ScalarExprEmitter::VisitExpr(Expr *E) { | |||
1577 | CGF.ErrorUnsupported(E, "scalar expression"); | |||
1578 | if (E->getType()->isVoidType()) | |||
1579 | return nullptr; | |||
1580 | return llvm::UndefValue::get(CGF.ConvertType(E->getType())); | |||
1581 | } | |||
1582 | ||||
1583 | Value *ScalarExprEmitter::VisitShuffleVectorExpr(ShuffleVectorExpr *E) { | |||
1584 | // Vector Mask Case | |||
1585 | if (E->getNumSubExprs() == 2) { | |||
1586 | Value *LHS = CGF.EmitScalarExpr(E->getExpr(0)); | |||
1587 | Value *RHS = CGF.EmitScalarExpr(E->getExpr(1)); | |||
1588 | Value *Mask; | |||
1589 | ||||
1590 | llvm::VectorType *LTy = cast<llvm::VectorType>(LHS->getType()); | |||
1591 | unsigned LHSElts = LTy->getNumElements(); | |||
1592 | ||||
1593 | Mask = RHS; | |||
1594 | ||||
1595 | llvm::VectorType *MTy = cast<llvm::VectorType>(Mask->getType()); | |||
1596 | ||||
1597 | // Mask off the high bits of each shuffle index. | |||
1598 | Value *MaskBits = | |||
1599 | llvm::ConstantInt::get(MTy, llvm::NextPowerOf2(LHSElts - 1) - 1); | |||
1600 | Mask = Builder.CreateAnd(Mask, MaskBits, "mask"); | |||
1601 | ||||
1602 | // newv = undef | |||
1603 | // mask = mask & maskbits | |||
1604 | // for each elt | |||
1605 | // n = extract mask i | |||
1606 | // x = extract val n | |||
1607 | // newv = insert newv, x, i | |||
1608 | llvm::VectorType *RTy = llvm::VectorType::get(LTy->getElementType(), | |||
1609 | MTy->getNumElements()); | |||
1610 | Value* NewV = llvm::UndefValue::get(RTy); | |||
1611 | for (unsigned i = 0, e = MTy->getNumElements(); i != e; ++i) { | |||
1612 | Value *IIndx = llvm::ConstantInt::get(CGF.SizeTy, i); | |||
1613 | Value *Indx = Builder.CreateExtractElement(Mask, IIndx, "shuf_idx"); | |||
1614 | ||||
1615 | Value *VExt = Builder.CreateExtractElement(LHS, Indx, "shuf_elt"); | |||
1616 | NewV = Builder.CreateInsertElement(NewV, VExt, IIndx, "shuf_ins"); | |||
1617 | } | |||
1618 | return NewV; | |||
1619 | } | |||
1620 | ||||
1621 | Value* V1 = CGF.EmitScalarExpr(E->getExpr(0)); | |||
1622 | Value* V2 = CGF.EmitScalarExpr(E->getExpr(1)); | |||
1623 | ||||
1624 | SmallVector<llvm::Constant*, 32> indices; | |||
1625 | for (unsigned i = 2; i < E->getNumSubExprs(); ++i) { | |||
1626 | llvm::APSInt Idx = E->getShuffleMaskIdx(CGF.getContext(), i-2); | |||
1627 | // Check for -1 and output it as undef in the IR. | |||
1628 | if (Idx.isSigned() && Idx.isAllOnesValue()) | |||
1629 | indices.push_back(llvm::UndefValue::get(CGF.Int32Ty)); | |||
1630 | else | |||
1631 | indices.push_back(Builder.getInt32(Idx.getZExtValue())); | |||
1632 | } | |||
1633 | ||||
1634 | Value *SV = llvm::ConstantVector::get(indices); | |||
1635 | return Builder.CreateShuffleVector(V1, V2, SV, "shuffle"); | |||
1636 | } | |||
1637 | ||||
1638 | Value *ScalarExprEmitter::VisitConvertVectorExpr(ConvertVectorExpr *E) { | |||
1639 | QualType SrcType = E->getSrcExpr()->getType(), | |||
1640 | DstType = E->getType(); | |||
1641 | ||||
1642 | Value *Src = CGF.EmitScalarExpr(E->getSrcExpr()); | |||
1643 | ||||
1644 | SrcType = CGF.getContext().getCanonicalType(SrcType); | |||
1645 | DstType = CGF.getContext().getCanonicalType(DstType); | |||
1646 | if (SrcType == DstType) return Src; | |||
1647 | ||||
1648 | assert(SrcType->isVectorType() &&((SrcType->isVectorType() && "ConvertVector source type must be a vector" ) ? static_cast<void> (0) : __assert_fail ("SrcType->isVectorType() && \"ConvertVector source type must be a vector\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1649, __PRETTY_FUNCTION__)) | |||
1649 | "ConvertVector source type must be a vector")((SrcType->isVectorType() && "ConvertVector source type must be a vector" ) ? static_cast<void> (0) : __assert_fail ("SrcType->isVectorType() && \"ConvertVector source type must be a vector\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1649, __PRETTY_FUNCTION__)); | |||
1650 | assert(DstType->isVectorType() &&((DstType->isVectorType() && "ConvertVector destination type must be a vector" ) ? static_cast<void> (0) : __assert_fail ("DstType->isVectorType() && \"ConvertVector destination type must be a vector\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1651, __PRETTY_FUNCTION__)) | |||
1651 | "ConvertVector destination type must be a vector")((DstType->isVectorType() && "ConvertVector destination type must be a vector" ) ? static_cast<void> (0) : __assert_fail ("DstType->isVectorType() && \"ConvertVector destination type must be a vector\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1651, __PRETTY_FUNCTION__)); | |||
1652 | ||||
1653 | llvm::Type *SrcTy = Src->getType(); | |||
1654 | llvm::Type *DstTy = ConvertType(DstType); | |||
1655 | ||||
1656 | // Ignore conversions like int -> uint. | |||
1657 | if (SrcTy == DstTy) | |||
1658 | return Src; | |||
1659 | ||||
1660 | QualType SrcEltType = SrcType->castAs<VectorType>()->getElementType(), | |||
1661 | DstEltType = DstType->castAs<VectorType>()->getElementType(); | |||
1662 | ||||
1663 | assert(SrcTy->isVectorTy() &&((SrcTy->isVectorTy() && "ConvertVector source IR type must be a vector" ) ? static_cast<void> (0) : __assert_fail ("SrcTy->isVectorTy() && \"ConvertVector source IR type must be a vector\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1664, __PRETTY_FUNCTION__)) | |||
1664 | "ConvertVector source IR type must be a vector")((SrcTy->isVectorTy() && "ConvertVector source IR type must be a vector" ) ? static_cast<void> (0) : __assert_fail ("SrcTy->isVectorTy() && \"ConvertVector source IR type must be a vector\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1664, __PRETTY_FUNCTION__)); | |||
1665 | assert(DstTy->isVectorTy() &&((DstTy->isVectorTy() && "ConvertVector destination IR type must be a vector" ) ? static_cast<void> (0) : __assert_fail ("DstTy->isVectorTy() && \"ConvertVector destination IR type must be a vector\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1666, __PRETTY_FUNCTION__)) | |||
1666 | "ConvertVector destination IR type must be a vector")((DstTy->isVectorTy() && "ConvertVector destination IR type must be a vector" ) ? static_cast<void> (0) : __assert_fail ("DstTy->isVectorTy() && \"ConvertVector destination IR type must be a vector\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1666, __PRETTY_FUNCTION__)); | |||
1667 | ||||
1668 | llvm::Type *SrcEltTy = SrcTy->getVectorElementType(), | |||
1669 | *DstEltTy = DstTy->getVectorElementType(); | |||
1670 | ||||
1671 | if (DstEltType->isBooleanType()) { | |||
1672 | assert((SrcEltTy->isFloatingPointTy() ||(((SrcEltTy->isFloatingPointTy() || isa<llvm::IntegerType >(SrcEltTy)) && "Unknown boolean conversion") ? static_cast <void> (0) : __assert_fail ("(SrcEltTy->isFloatingPointTy() || isa<llvm::IntegerType>(SrcEltTy)) && \"Unknown boolean conversion\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1673, __PRETTY_FUNCTION__)) | |||
1673 | isa<llvm::IntegerType>(SrcEltTy)) && "Unknown boolean conversion")(((SrcEltTy->isFloatingPointTy() || isa<llvm::IntegerType >(SrcEltTy)) && "Unknown boolean conversion") ? static_cast <void> (0) : __assert_fail ("(SrcEltTy->isFloatingPointTy() || isa<llvm::IntegerType>(SrcEltTy)) && \"Unknown boolean conversion\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1673, __PRETTY_FUNCTION__)); | |||
1674 | ||||
1675 | llvm::Value *Zero = llvm::Constant::getNullValue(SrcTy); | |||
1676 | if (SrcEltTy->isFloatingPointTy()) { | |||
1677 | return Builder.CreateFCmpUNE(Src, Zero, "tobool"); | |||
1678 | } else { | |||
1679 | return Builder.CreateICmpNE(Src, Zero, "tobool"); | |||
1680 | } | |||
1681 | } | |||
1682 | ||||
1683 | // We have the arithmetic types: real int/float. | |||
1684 | Value *Res = nullptr; | |||
1685 | ||||
1686 | if (isa<llvm::IntegerType>(SrcEltTy)) { | |||
1687 | bool InputSigned = SrcEltType->isSignedIntegerOrEnumerationType(); | |||
1688 | if (isa<llvm::IntegerType>(DstEltTy)) | |||
1689 | Res = Builder.CreateIntCast(Src, DstTy, InputSigned, "conv"); | |||
1690 | else if (InputSigned) | |||
1691 | Res = Builder.CreateSIToFP(Src, DstTy, "conv"); | |||
1692 | else | |||
1693 | Res = Builder.CreateUIToFP(Src, DstTy, "conv"); | |||
1694 | } else if (isa<llvm::IntegerType>(DstEltTy)) { | |||
1695 | assert(SrcEltTy->isFloatingPointTy() && "Unknown real conversion")((SrcEltTy->isFloatingPointTy() && "Unknown real conversion" ) ? static_cast<void> (0) : __assert_fail ("SrcEltTy->isFloatingPointTy() && \"Unknown real conversion\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1695, __PRETTY_FUNCTION__)); | |||
1696 | if (DstEltType->isSignedIntegerOrEnumerationType()) | |||
1697 | Res = Builder.CreateFPToSI(Src, DstTy, "conv"); | |||
1698 | else | |||
1699 | Res = Builder.CreateFPToUI(Src, DstTy, "conv"); | |||
1700 | } else { | |||
1701 | assert(SrcEltTy->isFloatingPointTy() && DstEltTy->isFloatingPointTy() &&((SrcEltTy->isFloatingPointTy() && DstEltTy->isFloatingPointTy () && "Unknown real conversion") ? static_cast<void > (0) : __assert_fail ("SrcEltTy->isFloatingPointTy() && DstEltTy->isFloatingPointTy() && \"Unknown real conversion\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1702, __PRETTY_FUNCTION__)) | |||
1702 | "Unknown real conversion")((SrcEltTy->isFloatingPointTy() && DstEltTy->isFloatingPointTy () && "Unknown real conversion") ? static_cast<void > (0) : __assert_fail ("SrcEltTy->isFloatingPointTy() && DstEltTy->isFloatingPointTy() && \"Unknown real conversion\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1702, __PRETTY_FUNCTION__)); | |||
1703 | if (DstEltTy->getTypeID() < SrcEltTy->getTypeID()) | |||
1704 | Res = Builder.CreateFPTrunc(Src, DstTy, "conv"); | |||
1705 | else | |||
1706 | Res = Builder.CreateFPExt(Src, DstTy, "conv"); | |||
1707 | } | |||
1708 | ||||
1709 | return Res; | |||
1710 | } | |||
1711 | ||||
1712 | Value *ScalarExprEmitter::VisitMemberExpr(MemberExpr *E) { | |||
1713 | if (CodeGenFunction::ConstantEmission Constant = CGF.tryEmitAsConstant(E)) { | |||
1714 | CGF.EmitIgnoredExpr(E->getBase()); | |||
1715 | return CGF.emitScalarConstant(Constant, E); | |||
1716 | } else { | |||
1717 | Expr::EvalResult Result; | |||
1718 | if (E->EvaluateAsInt(Result, CGF.getContext(), Expr::SE_AllowSideEffects)) { | |||
1719 | llvm::APSInt Value = Result.Val.getInt(); | |||
1720 | CGF.EmitIgnoredExpr(E->getBase()); | |||
1721 | return Builder.getInt(Value); | |||
1722 | } | |||
1723 | } | |||
1724 | ||||
1725 | return EmitLoadOfLValue(E); | |||
1726 | } | |||
1727 | ||||
1728 | Value *ScalarExprEmitter::VisitArraySubscriptExpr(ArraySubscriptExpr *E) { | |||
1729 | TestAndClearIgnoreResultAssign(); | |||
1730 | ||||
1731 | // Emit subscript expressions in rvalue context's. For most cases, this just | |||
1732 | // loads the lvalue formed by the subscript expr. However, we have to be | |||
1733 | // careful, because the base of a vector subscript is occasionally an rvalue, | |||
1734 | // so we can't get it as an lvalue. | |||
1735 | if (!E->getBase()->getType()->isVectorType()) | |||
1736 | return EmitLoadOfLValue(E); | |||
1737 | ||||
1738 | // Handle the vector case. The base must be a vector, the index must be an | |||
1739 | // integer value. | |||
1740 | Value *Base = Visit(E->getBase()); | |||
1741 | Value *Idx = Visit(E->getIdx()); | |||
1742 | QualType IdxTy = E->getIdx()->getType(); | |||
1743 | ||||
1744 | if (CGF.SanOpts.has(SanitizerKind::ArrayBounds)) | |||
1745 | CGF.EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, /*Accessed*/true); | |||
1746 | ||||
1747 | return Builder.CreateExtractElement(Base, Idx, "vecext"); | |||
1748 | } | |||
1749 | ||||
1750 | static llvm::Constant *getMaskElt(llvm::ShuffleVectorInst *SVI, unsigned Idx, | |||
1751 | unsigned Off, llvm::Type *I32Ty) { | |||
1752 | int MV = SVI->getMaskValue(Idx); | |||
1753 | if (MV == -1) | |||
1754 | return llvm::UndefValue::get(I32Ty); | |||
1755 | return llvm::ConstantInt::get(I32Ty, Off+MV); | |||
1756 | } | |||
1757 | ||||
1758 | static llvm::Constant *getAsInt32(llvm::ConstantInt *C, llvm::Type *I32Ty) { | |||
1759 | if (C->getBitWidth() != 32) { | |||
1760 | assert(llvm::ConstantInt::isValueValidForType(I32Ty,((llvm::ConstantInt::isValueValidForType(I32Ty, C->getZExtValue ()) && "Index operand too large for shufflevector mask!" ) ? static_cast<void> (0) : __assert_fail ("llvm::ConstantInt::isValueValidForType(I32Ty, C->getZExtValue()) && \"Index operand too large for shufflevector mask!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1762, __PRETTY_FUNCTION__)) | |||
1761 | C->getZExtValue()) &&((llvm::ConstantInt::isValueValidForType(I32Ty, C->getZExtValue ()) && "Index operand too large for shufflevector mask!" ) ? static_cast<void> (0) : __assert_fail ("llvm::ConstantInt::isValueValidForType(I32Ty, C->getZExtValue()) && \"Index operand too large for shufflevector mask!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1762, __PRETTY_FUNCTION__)) | |||
1762 | "Index operand too large for shufflevector mask!")((llvm::ConstantInt::isValueValidForType(I32Ty, C->getZExtValue ()) && "Index operand too large for shufflevector mask!" ) ? static_cast<void> (0) : __assert_fail ("llvm::ConstantInt::isValueValidForType(I32Ty, C->getZExtValue()) && \"Index operand too large for shufflevector mask!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1762, __PRETTY_FUNCTION__)); | |||
1763 | return llvm::ConstantInt::get(I32Ty, C->getZExtValue()); | |||
1764 | } | |||
1765 | return C; | |||
1766 | } | |||
1767 | ||||
1768 | Value *ScalarExprEmitter::VisitInitListExpr(InitListExpr *E) { | |||
1769 | bool Ignore = TestAndClearIgnoreResultAssign(); | |||
1770 | (void)Ignore; | |||
1771 | assert (Ignore == false && "init list ignored")((Ignore == false && "init list ignored") ? static_cast <void> (0) : __assert_fail ("Ignore == false && \"init list ignored\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1771, __PRETTY_FUNCTION__)); | |||
1772 | unsigned NumInitElements = E->getNumInits(); | |||
1773 | ||||
1774 | if (E->hadArrayRangeDesignator()) | |||
1775 | CGF.ErrorUnsupported(E, "GNU array range designator extension"); | |||
1776 | ||||
1777 | llvm::VectorType *VType = | |||
1778 | dyn_cast<llvm::VectorType>(ConvertType(E->getType())); | |||
1779 | ||||
1780 | if (!VType) { | |||
1781 | if (NumInitElements == 0) { | |||
1782 | // C++11 value-initialization for the scalar. | |||
1783 | return EmitNullValue(E->getType()); | |||
1784 | } | |||
1785 | // We have a scalar in braces. Just use the first element. | |||
1786 | return Visit(E->getInit(0)); | |||
1787 | } | |||
1788 | ||||
1789 | unsigned ResElts = VType->getNumElements(); | |||
1790 | ||||
1791 | // Loop over initializers collecting the Value for each, and remembering | |||
1792 | // whether the source was swizzle (ExtVectorElementExpr). This will allow | |||
1793 | // us to fold the shuffle for the swizzle into the shuffle for the vector | |||
1794 | // initializer, since LLVM optimizers generally do not want to touch | |||
1795 | // shuffles. | |||
1796 | unsigned CurIdx = 0; | |||
1797 | bool VIsUndefShuffle = false; | |||
1798 | llvm::Value *V = llvm::UndefValue::get(VType); | |||
1799 | for (unsigned i = 0; i != NumInitElements; ++i) { | |||
1800 | Expr *IE = E->getInit(i); | |||
1801 | Value *Init = Visit(IE); | |||
1802 | SmallVector<llvm::Constant*, 16> Args; | |||
1803 | ||||
1804 | llvm::VectorType *VVT = dyn_cast<llvm::VectorType>(Init->getType()); | |||
1805 | ||||
1806 | // Handle scalar elements. If the scalar initializer is actually one | |||
1807 | // element of a different vector of the same width, use shuffle instead of | |||
1808 | // extract+insert. | |||
1809 | if (!VVT) { | |||
1810 | if (isa<ExtVectorElementExpr>(IE)) { | |||
1811 | llvm::ExtractElementInst *EI = cast<llvm::ExtractElementInst>(Init); | |||
1812 | ||||
1813 | if (EI->getVectorOperandType()->getNumElements() == ResElts) { | |||
1814 | llvm::ConstantInt *C = cast<llvm::ConstantInt>(EI->getIndexOperand()); | |||
1815 | Value *LHS = nullptr, *RHS = nullptr; | |||
1816 | if (CurIdx == 0) { | |||
1817 | // insert into undef -> shuffle (src, undef) | |||
1818 | // shufflemask must use an i32 | |||
1819 | Args.push_back(getAsInt32(C, CGF.Int32Ty)); | |||
1820 | Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty)); | |||
1821 | ||||
1822 | LHS = EI->getVectorOperand(); | |||
1823 | RHS = V; | |||
1824 | VIsUndefShuffle = true; | |||
1825 | } else if (VIsUndefShuffle) { | |||
1826 | // insert into undefshuffle && size match -> shuffle (v, src) | |||
1827 | llvm::ShuffleVectorInst *SVV = cast<llvm::ShuffleVectorInst>(V); | |||
1828 | for (unsigned j = 0; j != CurIdx; ++j) | |||
1829 | Args.push_back(getMaskElt(SVV, j, 0, CGF.Int32Ty)); | |||
1830 | Args.push_back(Builder.getInt32(ResElts + C->getZExtValue())); | |||
1831 | Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty)); | |||
1832 | ||||
1833 | LHS = cast<llvm::ShuffleVectorInst>(V)->getOperand(0); | |||
1834 | RHS = EI->getVectorOperand(); | |||
1835 | VIsUndefShuffle = false; | |||
1836 | } | |||
1837 | if (!Args.empty()) { | |||
1838 | llvm::Constant *Mask = llvm::ConstantVector::get(Args); | |||
1839 | V = Builder.CreateShuffleVector(LHS, RHS, Mask); | |||
1840 | ++CurIdx; | |||
1841 | continue; | |||
1842 | } | |||
1843 | } | |||
1844 | } | |||
1845 | V = Builder.CreateInsertElement(V, Init, Builder.getInt32(CurIdx), | |||
1846 | "vecinit"); | |||
1847 | VIsUndefShuffle = false; | |||
1848 | ++CurIdx; | |||
1849 | continue; | |||
1850 | } | |||
1851 | ||||
1852 | unsigned InitElts = VVT->getNumElements(); | |||
1853 | ||||
1854 | // If the initializer is an ExtVecEltExpr (a swizzle), and the swizzle's | |||
1855 | // input is the same width as the vector being constructed, generate an | |||
1856 | // optimized shuffle of the swizzle input into the result. | |||
1857 | unsigned Offset = (CurIdx == 0) ? 0 : ResElts; | |||
1858 | if (isa<ExtVectorElementExpr>(IE)) { | |||
1859 | llvm::ShuffleVectorInst *SVI = cast<llvm::ShuffleVectorInst>(Init); | |||
1860 | Value *SVOp = SVI->getOperand(0); | |||
1861 | llvm::VectorType *OpTy = cast<llvm::VectorType>(SVOp->getType()); | |||
1862 | ||||
1863 | if (OpTy->getNumElements() == ResElts) { | |||
1864 | for (unsigned j = 0; j != CurIdx; ++j) { | |||
1865 | // If the current vector initializer is a shuffle with undef, merge | |||
1866 | // this shuffle directly into it. | |||
1867 | if (VIsUndefShuffle) { | |||
1868 | Args.push_back(getMaskElt(cast<llvm::ShuffleVectorInst>(V), j, 0, | |||
1869 | CGF.Int32Ty)); | |||
1870 | } else { | |||
1871 | Args.push_back(Builder.getInt32(j)); | |||
1872 | } | |||
1873 | } | |||
1874 | for (unsigned j = 0, je = InitElts; j != je; ++j) | |||
1875 | Args.push_back(getMaskElt(SVI, j, Offset, CGF.Int32Ty)); | |||
1876 | Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty)); | |||
1877 | ||||
1878 | if (VIsUndefShuffle) | |||
1879 | V = cast<llvm::ShuffleVectorInst>(V)->getOperand(0); | |||
1880 | ||||
1881 | Init = SVOp; | |||
1882 | } | |||
1883 | } | |||
1884 | ||||
1885 | // Extend init to result vector length, and then shuffle its contribution | |||
1886 | // to the vector initializer into V. | |||
1887 | if (Args.empty()) { | |||
1888 | for (unsigned j = 0; j != InitElts; ++j) | |||
1889 | Args.push_back(Builder.getInt32(j)); | |||
1890 | Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty)); | |||
1891 | llvm::Constant *Mask = llvm::ConstantVector::get(Args); | |||
1892 | Init = Builder.CreateShuffleVector(Init, llvm::UndefValue::get(VVT), | |||
1893 | Mask, "vext"); | |||
1894 | ||||
1895 | Args.clear(); | |||
1896 | for (unsigned j = 0; j != CurIdx; ++j) | |||
1897 | Args.push_back(Builder.getInt32(j)); | |||
1898 | for (unsigned j = 0; j != InitElts; ++j) | |||
1899 | Args.push_back(Builder.getInt32(j+Offset)); | |||
1900 | Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty)); | |||
1901 | } | |||
1902 | ||||
1903 | // If V is undef, make sure it ends up on the RHS of the shuffle to aid | |||
1904 | // merging subsequent shuffles into this one. | |||
1905 | if (CurIdx == 0) | |||
1906 | std::swap(V, Init); | |||
1907 | llvm::Constant *Mask = llvm::ConstantVector::get(Args); | |||
1908 | V = Builder.CreateShuffleVector(V, Init, Mask, "vecinit"); | |||
1909 | VIsUndefShuffle = isa<llvm::UndefValue>(Init); | |||
1910 | CurIdx += InitElts; | |||
1911 | } | |||
1912 | ||||
1913 | // FIXME: evaluate codegen vs. shuffling against constant null vector. | |||
1914 | // Emit remaining default initializers. | |||
1915 | llvm::Type *EltTy = VType->getElementType(); | |||
1916 | ||||
1917 | // Emit remaining default initializers | |||
1918 | for (/* Do not initialize i*/; CurIdx < ResElts; ++CurIdx) { | |||
1919 | Value *Idx = Builder.getInt32(CurIdx); | |||
1920 | llvm::Value *Init = llvm::Constant::getNullValue(EltTy); | |||
1921 | V = Builder.CreateInsertElement(V, Init, Idx, "vecinit"); | |||
1922 | } | |||
1923 | return V; | |||
1924 | } | |||
1925 | ||||
1926 | bool CodeGenFunction::ShouldNullCheckClassCastValue(const CastExpr *CE) { | |||
1927 | const Expr *E = CE->getSubExpr(); | |||
1928 | ||||
1929 | if (CE->getCastKind() == CK_UncheckedDerivedToBase) | |||
1930 | return false; | |||
1931 | ||||
1932 | if (isa<CXXThisExpr>(E->IgnoreParens())) { | |||
1933 | // We always assume that 'this' is never null. | |||
1934 | return false; | |||
1935 | } | |||
1936 | ||||
1937 | if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(CE)) { | |||
1938 | // And that glvalue casts are never null. | |||
1939 | if (ICE->getValueKind() != VK_RValue) | |||
1940 | return false; | |||
1941 | } | |||
1942 | ||||
1943 | return true; | |||
1944 | } | |||
1945 | ||||
1946 | // VisitCastExpr - Emit code for an explicit or implicit cast. Implicit casts | |||
1947 | // have to handle a more broad range of conversions than explicit casts, as they | |||
1948 | // handle things like function to ptr-to-function decay etc. | |||
1949 | Value *ScalarExprEmitter::VisitCastExpr(CastExpr *CE) { | |||
1950 | Expr *E = CE->getSubExpr(); | |||
1951 | QualType DestTy = CE->getType(); | |||
1952 | CastKind Kind = CE->getCastKind(); | |||
1953 | ||||
1954 | // These cases are generally not written to ignore the result of | |||
1955 | // evaluating their sub-expressions, so we clear this now. | |||
1956 | bool Ignored = TestAndClearIgnoreResultAssign(); | |||
1957 | ||||
1958 | // Since almost all cast kinds apply to scalars, this switch doesn't have | |||
1959 | // a default case, so the compiler will warn on a missing case. The cases | |||
1960 | // are in the same order as in the CastKind enum. | |||
1961 | switch (Kind) { | |||
1962 | case CK_Dependent: llvm_unreachable("dependent cast kind in IR gen!")::llvm::llvm_unreachable_internal("dependent cast kind in IR gen!" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1962); | |||
1963 | case CK_BuiltinFnToFnPtr: | |||
1964 | llvm_unreachable("builtin functions are handled elsewhere")::llvm::llvm_unreachable_internal("builtin functions are handled elsewhere" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1964); | |||
1965 | ||||
1966 | case CK_LValueBitCast: | |||
1967 | case CK_ObjCObjectLValueCast: { | |||
1968 | Address Addr = EmitLValue(E).getAddress(); | |||
1969 | Addr = Builder.CreateElementBitCast(Addr, CGF.ConvertTypeForMem(DestTy)); | |||
1970 | LValue LV = CGF.MakeAddrLValue(Addr, DestTy); | |||
1971 | return EmitLoadOfLValue(LV, CE->getExprLoc()); | |||
1972 | } | |||
1973 | ||||
1974 | case CK_LValueToRValueBitCast: { | |||
1975 | LValue SourceLVal = CGF.EmitLValue(E); | |||
1976 | Address Addr = Builder.CreateElementBitCast(SourceLVal.getAddress(), | |||
1977 | CGF.ConvertTypeForMem(DestTy)); | |||
1978 | LValue DestLV = CGF.MakeAddrLValue(Addr, DestTy); | |||
1979 | DestLV.setTBAAInfo(TBAAAccessInfo::getMayAliasInfo()); | |||
1980 | return EmitLoadOfLValue(DestLV, CE->getExprLoc()); | |||
1981 | } | |||
1982 | ||||
1983 | case CK_CPointerToObjCPointerCast: | |||
1984 | case CK_BlockPointerToObjCPointerCast: | |||
1985 | case CK_AnyPointerToBlockPointerCast: | |||
1986 | case CK_BitCast: { | |||
1987 | Value *Src = Visit(const_cast<Expr*>(E)); | |||
1988 | llvm::Type *SrcTy = Src->getType(); | |||
1989 | llvm::Type *DstTy = ConvertType(DestTy); | |||
1990 | if (SrcTy->isPtrOrPtrVectorTy() && DstTy->isPtrOrPtrVectorTy() && | |||
1991 | SrcTy->getPointerAddressSpace() != DstTy->getPointerAddressSpace()) { | |||
1992 | llvm_unreachable("wrong cast for pointers in different address spaces"::llvm::llvm_unreachable_internal("wrong cast for pointers in different address spaces" "(must be an address space cast)!", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1993) | |||
1993 | "(must be an address space cast)!")::llvm::llvm_unreachable_internal("wrong cast for pointers in different address spaces" "(must be an address space cast)!", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 1993); | |||
1994 | } | |||
1995 | ||||
1996 | if (CGF.SanOpts.has(SanitizerKind::CFIUnrelatedCast)) { | |||
1997 | if (auto PT = DestTy->getAs<PointerType>()) | |||
1998 | CGF.EmitVTablePtrCheckForCast(PT->getPointeeType(), Src, | |||
1999 | /*MayBeNull=*/true, | |||
2000 | CodeGenFunction::CFITCK_UnrelatedCast, | |||
2001 | CE->getBeginLoc()); | |||
2002 | } | |||
2003 | ||||
2004 | if (CGF.CGM.getCodeGenOpts().StrictVTablePointers) { | |||
2005 | const QualType SrcType = E->getType(); | |||
2006 | ||||
2007 | if (SrcType.mayBeNotDynamicClass() && DestTy.mayBeDynamicClass()) { | |||
2008 | // Casting to pointer that could carry dynamic information (provided by | |||
2009 | // invariant.group) requires launder. | |||
2010 | Src = Builder.CreateLaunderInvariantGroup(Src); | |||
2011 | } else if (SrcType.mayBeDynamicClass() && DestTy.mayBeNotDynamicClass()) { | |||
2012 | // Casting to pointer that does not carry dynamic information (provided | |||
2013 | // by invariant.group) requires stripping it. Note that we don't do it | |||
2014 | // if the source could not be dynamic type and destination could be | |||
2015 | // dynamic because dynamic information is already laundered. It is | |||
2016 | // because launder(strip(src)) == launder(src), so there is no need to | |||
2017 | // add extra strip before launder. | |||
2018 | Src = Builder.CreateStripInvariantGroup(Src); | |||
2019 | } | |||
2020 | } | |||
2021 | ||||
2022 | // Update heapallocsite metadata when there is an explicit cast. | |||
2023 | if (llvm::CallInst *CI = dyn_cast<llvm::CallInst>(Src)) | |||
2024 | if (CI->getMetadata("heapallocsite") && isa<ExplicitCastExpr>(CE)) | |||
2025 | CGF.getDebugInfo()-> | |||
2026 | addHeapAllocSiteMetadata(CI, CE->getType(), CE->getExprLoc()); | |||
2027 | ||||
2028 | return Builder.CreateBitCast(Src, DstTy); | |||
2029 | } | |||
2030 | case CK_AddressSpaceConversion: { | |||
2031 | Expr::EvalResult Result; | |||
2032 | if (E->EvaluateAsRValue(Result, CGF.getContext()) && | |||
2033 | Result.Val.isNullPointer()) { | |||
2034 | // If E has side effect, it is emitted even if its final result is a | |||
2035 | // null pointer. In that case, a DCE pass should be able to | |||
2036 | // eliminate the useless instructions emitted during translating E. | |||
2037 | if (Result.HasSideEffects) | |||
2038 | Visit(E); | |||
2039 | return CGF.CGM.getNullPointer(cast<llvm::PointerType>( | |||
2040 | ConvertType(DestTy)), DestTy); | |||
2041 | } | |||
2042 | // Since target may map different address spaces in AST to the same address | |||
2043 | // space, an address space conversion may end up as a bitcast. | |||
2044 | return CGF.CGM.getTargetCodeGenInfo().performAddrSpaceCast( | |||
2045 | CGF, Visit(E), E->getType()->getPointeeType().getAddressSpace(), | |||
2046 | DestTy->getPointeeType().getAddressSpace(), ConvertType(DestTy)); | |||
2047 | } | |||
2048 | case CK_AtomicToNonAtomic: | |||
2049 | case CK_NonAtomicToAtomic: | |||
2050 | case CK_NoOp: | |||
2051 | case CK_UserDefinedConversion: | |||
2052 | return Visit(const_cast<Expr*>(E)); | |||
2053 | ||||
2054 | case CK_BaseToDerived: { | |||
2055 | const CXXRecordDecl *DerivedClassDecl = DestTy->getPointeeCXXRecordDecl(); | |||
2056 | assert(DerivedClassDecl && "BaseToDerived arg isn't a C++ object pointer!")((DerivedClassDecl && "BaseToDerived arg isn't a C++ object pointer!" ) ? static_cast<void> (0) : __assert_fail ("DerivedClassDecl && \"BaseToDerived arg isn't a C++ object pointer!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2056, __PRETTY_FUNCTION__)); | |||
2057 | ||||
2058 | Address Base = CGF.EmitPointerWithAlignment(E); | |||
2059 | Address Derived = | |||
2060 | CGF.GetAddressOfDerivedClass(Base, DerivedClassDecl, | |||
2061 | CE->path_begin(), CE->path_end(), | |||
2062 | CGF.ShouldNullCheckClassCastValue(CE)); | |||
2063 | ||||
2064 | // C++11 [expr.static.cast]p11: Behavior is undefined if a downcast is | |||
2065 | // performed and the object is not of the derived type. | |||
2066 | if (CGF.sanitizePerformTypeCheck()) | |||
2067 | CGF.EmitTypeCheck(CodeGenFunction::TCK_DowncastPointer, CE->getExprLoc(), | |||
2068 | Derived.getPointer(), DestTy->getPointeeType()); | |||
2069 | ||||
2070 | if (CGF.SanOpts.has(SanitizerKind::CFIDerivedCast)) | |||
2071 | CGF.EmitVTablePtrCheckForCast( | |||
2072 | DestTy->getPointeeType(), Derived.getPointer(), | |||
2073 | /*MayBeNull=*/true, CodeGenFunction::CFITCK_DerivedCast, | |||
2074 | CE->getBeginLoc()); | |||
2075 | ||||
2076 | return Derived.getPointer(); | |||
2077 | } | |||
2078 | case CK_UncheckedDerivedToBase: | |||
2079 | case CK_DerivedToBase: { | |||
2080 | // The EmitPointerWithAlignment path does this fine; just discard | |||
2081 | // the alignment. | |||
2082 | return CGF.EmitPointerWithAlignment(CE).getPointer(); | |||
2083 | } | |||
2084 | ||||
2085 | case CK_Dynamic: { | |||
2086 | Address V = CGF.EmitPointerWithAlignment(E); | |||
2087 | const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(CE); | |||
2088 | return CGF.EmitDynamicCast(V, DCE); | |||
2089 | } | |||
2090 | ||||
2091 | case CK_ArrayToPointerDecay: | |||
2092 | return CGF.EmitArrayToPointerDecay(E).getPointer(); | |||
2093 | case CK_FunctionToPointerDecay: | |||
2094 | return EmitLValue(E).getPointer(); | |||
2095 | ||||
2096 | case CK_NullToPointer: | |||
2097 | if (MustVisitNullValue(E)) | |||
2098 | CGF.EmitIgnoredExpr(E); | |||
2099 | ||||
2100 | return CGF.CGM.getNullPointer(cast<llvm::PointerType>(ConvertType(DestTy)), | |||
2101 | DestTy); | |||
2102 | ||||
2103 | case CK_NullToMemberPointer: { | |||
2104 | if (MustVisitNullValue(E)) | |||
2105 | CGF.EmitIgnoredExpr(E); | |||
2106 | ||||
2107 | const MemberPointerType *MPT = CE->getType()->getAs<MemberPointerType>(); | |||
2108 | return CGF.CGM.getCXXABI().EmitNullMemberPointer(MPT); | |||
2109 | } | |||
2110 | ||||
2111 | case CK_ReinterpretMemberPointer: | |||
2112 | case CK_BaseToDerivedMemberPointer: | |||
2113 | case CK_DerivedToBaseMemberPointer: { | |||
2114 | Value *Src = Visit(E); | |||
2115 | ||||
2116 | // Note that the AST doesn't distinguish between checked and | |||
2117 | // unchecked member pointer conversions, so we always have to | |||
2118 | // implement checked conversions here. This is inefficient when | |||
2119 | // actual control flow may be required in order to perform the | |||
2120 | // check, which it is for data member pointers (but not member | |||
2121 | // function pointers on Itanium and ARM). | |||
2122 | return CGF.CGM.getCXXABI().EmitMemberPointerConversion(CGF, CE, Src); | |||
2123 | } | |||
2124 | ||||
2125 | case CK_ARCProduceObject: | |||
2126 | return CGF.EmitARCRetainScalarExpr(E); | |||
2127 | case CK_ARCConsumeObject: | |||
2128 | return CGF.EmitObjCConsumeObject(E->getType(), Visit(E)); | |||
2129 | case CK_ARCReclaimReturnedObject: | |||
2130 | return CGF.EmitARCReclaimReturnedObject(E, /*allowUnsafe*/ Ignored); | |||
2131 | case CK_ARCExtendBlockObject: | |||
2132 | return CGF.EmitARCExtendBlockObject(E); | |||
2133 | ||||
2134 | case CK_CopyAndAutoreleaseBlockObject: | |||
2135 | return CGF.EmitBlockCopyAndAutorelease(Visit(E), E->getType()); | |||
2136 | ||||
2137 | case CK_FloatingRealToComplex: | |||
2138 | case CK_FloatingComplexCast: | |||
2139 | case CK_IntegralRealToComplex: | |||
2140 | case CK_IntegralComplexCast: | |||
2141 | case CK_IntegralComplexToFloatingComplex: | |||
2142 | case CK_FloatingComplexToIntegralComplex: | |||
2143 | case CK_ConstructorConversion: | |||
2144 | case CK_ToUnion: | |||
2145 | llvm_unreachable("scalar cast to non-scalar value")::llvm::llvm_unreachable_internal("scalar cast to non-scalar value" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2145); | |||
2146 | ||||
2147 | case CK_LValueToRValue: | |||
2148 | assert(CGF.getContext().hasSameUnqualifiedType(E->getType(), DestTy))((CGF.getContext().hasSameUnqualifiedType(E->getType(), DestTy )) ? static_cast<void> (0) : __assert_fail ("CGF.getContext().hasSameUnqualifiedType(E->getType(), DestTy)" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2148, __PRETTY_FUNCTION__)); | |||
2149 | assert(E->isGLValue() && "lvalue-to-rvalue applied to r-value!")((E->isGLValue() && "lvalue-to-rvalue applied to r-value!" ) ? static_cast<void> (0) : __assert_fail ("E->isGLValue() && \"lvalue-to-rvalue applied to r-value!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2149, __PRETTY_FUNCTION__)); | |||
2150 | return Visit(const_cast<Expr*>(E)); | |||
2151 | ||||
2152 | case CK_IntegralToPointer: { | |||
2153 | Value *Src = Visit(const_cast<Expr*>(E)); | |||
2154 | ||||
2155 | // First, convert to the correct width so that we control the kind of | |||
2156 | // extension. | |||
2157 | auto DestLLVMTy = ConvertType(DestTy); | |||
2158 | llvm::Type *MiddleTy = CGF.CGM.getDataLayout().getIntPtrType(DestLLVMTy); | |||
2159 | bool InputSigned = E->getType()->isSignedIntegerOrEnumerationType(); | |||
2160 | llvm::Value* IntResult = | |||
2161 | Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv"); | |||
2162 | ||||
2163 | auto *IntToPtr = Builder.CreateIntToPtr(IntResult, DestLLVMTy); | |||
2164 | ||||
2165 | if (CGF.CGM.getCodeGenOpts().StrictVTablePointers) { | |||
2166 | // Going from integer to pointer that could be dynamic requires reloading | |||
2167 | // dynamic information from invariant.group. | |||
2168 | if (DestTy.mayBeDynamicClass()) | |||
2169 | IntToPtr = Builder.CreateLaunderInvariantGroup(IntToPtr); | |||
2170 | } | |||
2171 | return IntToPtr; | |||
2172 | } | |||
2173 | case CK_PointerToIntegral: { | |||
2174 | assert(!DestTy->isBooleanType() && "bool should use PointerToBool")((!DestTy->isBooleanType() && "bool should use PointerToBool" ) ? static_cast<void> (0) : __assert_fail ("!DestTy->isBooleanType() && \"bool should use PointerToBool\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2174, __PRETTY_FUNCTION__)); | |||
2175 | auto *PtrExpr = Visit(E); | |||
2176 | ||||
2177 | if (CGF.CGM.getCodeGenOpts().StrictVTablePointers) { | |||
2178 | const QualType SrcType = E->getType(); | |||
2179 | ||||
2180 | // Casting to integer requires stripping dynamic information as it does | |||
2181 | // not carries it. | |||
2182 | if (SrcType.mayBeDynamicClass()) | |||
2183 | PtrExpr = Builder.CreateStripInvariantGroup(PtrExpr); | |||
2184 | } | |||
2185 | ||||
2186 | return Builder.CreatePtrToInt(PtrExpr, ConvertType(DestTy)); | |||
2187 | } | |||
2188 | case CK_ToVoid: { | |||
2189 | CGF.EmitIgnoredExpr(E); | |||
2190 | return nullptr; | |||
2191 | } | |||
2192 | case CK_VectorSplat: { | |||
2193 | llvm::Type *DstTy = ConvertType(DestTy); | |||
2194 | Value *Elt = Visit(const_cast<Expr*>(E)); | |||
2195 | // Splat the element across to all elements | |||
2196 | unsigned NumElements = DstTy->getVectorNumElements(); | |||
2197 | return Builder.CreateVectorSplat(NumElements, Elt, "splat"); | |||
2198 | } | |||
2199 | ||||
2200 | case CK_FixedPointCast: | |||
2201 | return EmitScalarConversion(Visit(E), E->getType(), DestTy, | |||
2202 | CE->getExprLoc()); | |||
2203 | ||||
2204 | case CK_FixedPointToBoolean: | |||
2205 | assert(E->getType()->isFixedPointType() &&((E->getType()->isFixedPointType() && "Expected src type to be fixed point type" ) ? static_cast<void> (0) : __assert_fail ("E->getType()->isFixedPointType() && \"Expected src type to be fixed point type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2206, __PRETTY_FUNCTION__)) | |||
2206 | "Expected src type to be fixed point type")((E->getType()->isFixedPointType() && "Expected src type to be fixed point type" ) ? static_cast<void> (0) : __assert_fail ("E->getType()->isFixedPointType() && \"Expected src type to be fixed point type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2206, __PRETTY_FUNCTION__)); | |||
2207 | assert(DestTy->isBooleanType() && "Expected dest type to be boolean type")((DestTy->isBooleanType() && "Expected dest type to be boolean type" ) ? static_cast<void> (0) : __assert_fail ("DestTy->isBooleanType() && \"Expected dest type to be boolean type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2207, __PRETTY_FUNCTION__)); | |||
2208 | return EmitScalarConversion(Visit(E), E->getType(), DestTy, | |||
2209 | CE->getExprLoc()); | |||
2210 | ||||
2211 | case CK_FixedPointToIntegral: | |||
2212 | assert(E->getType()->isFixedPointType() &&((E->getType()->isFixedPointType() && "Expected src type to be fixed point type" ) ? static_cast<void> (0) : __assert_fail ("E->getType()->isFixedPointType() && \"Expected src type to be fixed point type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2213, __PRETTY_FUNCTION__)) | |||
2213 | "Expected src type to be fixed point type")((E->getType()->isFixedPointType() && "Expected src type to be fixed point type" ) ? static_cast<void> (0) : __assert_fail ("E->getType()->isFixedPointType() && \"Expected src type to be fixed point type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2213, __PRETTY_FUNCTION__)); | |||
2214 | assert(DestTy->isIntegerType() && "Expected dest type to be an integer")((DestTy->isIntegerType() && "Expected dest type to be an integer" ) ? static_cast<void> (0) : __assert_fail ("DestTy->isIntegerType() && \"Expected dest type to be an integer\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2214, __PRETTY_FUNCTION__)); | |||
2215 | return EmitScalarConversion(Visit(E), E->getType(), DestTy, | |||
2216 | CE->getExprLoc()); | |||
2217 | ||||
2218 | case CK_IntegralToFixedPoint: | |||
2219 | assert(E->getType()->isIntegerType() &&((E->getType()->isIntegerType() && "Expected src type to be an integer" ) ? static_cast<void> (0) : __assert_fail ("E->getType()->isIntegerType() && \"Expected src type to be an integer\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2220, __PRETTY_FUNCTION__)) | |||
2220 | "Expected src type to be an integer")((E->getType()->isIntegerType() && "Expected src type to be an integer" ) ? static_cast<void> (0) : __assert_fail ("E->getType()->isIntegerType() && \"Expected src type to be an integer\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2220, __PRETTY_FUNCTION__)); | |||
2221 | assert(DestTy->isFixedPointType() &&((DestTy->isFixedPointType() && "Expected dest type to be fixed point type" ) ? static_cast<void> (0) : __assert_fail ("DestTy->isFixedPointType() && \"Expected dest type to be fixed point type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2222, __PRETTY_FUNCTION__)) | |||
2222 | "Expected dest type to be fixed point type")((DestTy->isFixedPointType() && "Expected dest type to be fixed point type" ) ? static_cast<void> (0) : __assert_fail ("DestTy->isFixedPointType() && \"Expected dest type to be fixed point type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2222, __PRETTY_FUNCTION__)); | |||
2223 | return EmitScalarConversion(Visit(E), E->getType(), DestTy, | |||
2224 | CE->getExprLoc()); | |||
2225 | ||||
2226 | case CK_IntegralCast: { | |||
2227 | ScalarConversionOpts Opts; | |||
2228 | if (auto *ICE = dyn_cast<ImplicitCastExpr>(CE)) { | |||
2229 | if (!ICE->isPartOfExplicitCast()) | |||
2230 | Opts = ScalarConversionOpts(CGF.SanOpts); | |||
2231 | } | |||
2232 | return EmitScalarConversion(Visit(E), E->getType(), DestTy, | |||
2233 | CE->getExprLoc(), Opts); | |||
2234 | } | |||
2235 | case CK_IntegralToFloating: | |||
2236 | case CK_FloatingToIntegral: | |||
2237 | case CK_FloatingCast: | |||
2238 | return EmitScalarConversion(Visit(E), E->getType(), DestTy, | |||
2239 | CE->getExprLoc()); | |||
2240 | case CK_BooleanToSignedIntegral: { | |||
2241 | ScalarConversionOpts Opts; | |||
2242 | Opts.TreatBooleanAsSigned = true; | |||
2243 | return EmitScalarConversion(Visit(E), E->getType(), DestTy, | |||
2244 | CE->getExprLoc(), Opts); | |||
2245 | } | |||
2246 | case CK_IntegralToBoolean: | |||
2247 | return EmitIntToBoolConversion(Visit(E)); | |||
2248 | case CK_PointerToBoolean: | |||
2249 | return EmitPointerToBoolConversion(Visit(E), E->getType()); | |||
2250 | case CK_FloatingToBoolean: | |||
2251 | return EmitFloatToBoolConversion(Visit(E)); | |||
2252 | case CK_MemberPointerToBoolean: { | |||
2253 | llvm::Value *MemPtr = Visit(E); | |||
2254 | const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>(); | |||
2255 | return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, MemPtr, MPT); | |||
2256 | } | |||
2257 | ||||
2258 | case CK_FloatingComplexToReal: | |||
2259 | case CK_IntegralComplexToReal: | |||
2260 | return CGF.EmitComplexExpr(E, false, true).first; | |||
2261 | ||||
2262 | case CK_FloatingComplexToBoolean: | |||
2263 | case CK_IntegralComplexToBoolean: { | |||
2264 | CodeGenFunction::ComplexPairTy V = CGF.EmitComplexExpr(E); | |||
2265 | ||||
2266 | // TODO: kill this function off, inline appropriate case here | |||
2267 | return EmitComplexToScalarConversion(V, E->getType(), DestTy, | |||
2268 | CE->getExprLoc()); | |||
2269 | } | |||
2270 | ||||
2271 | case CK_ZeroToOCLOpaqueType: { | |||
2272 | assert((DestTy->isEventT() || DestTy->isQueueT() ||(((DestTy->isEventT() || DestTy->isQueueT() || DestTy-> isOCLIntelSubgroupAVCType()) && "CK_ZeroToOCLEvent cast on non-event type" ) ? static_cast<void> (0) : __assert_fail ("(DestTy->isEventT() || DestTy->isQueueT() || DestTy->isOCLIntelSubgroupAVCType()) && \"CK_ZeroToOCLEvent cast on non-event type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2274, __PRETTY_FUNCTION__)) | |||
2273 | DestTy->isOCLIntelSubgroupAVCType()) &&(((DestTy->isEventT() || DestTy->isQueueT() || DestTy-> isOCLIntelSubgroupAVCType()) && "CK_ZeroToOCLEvent cast on non-event type" ) ? static_cast<void> (0) : __assert_fail ("(DestTy->isEventT() || DestTy->isQueueT() || DestTy->isOCLIntelSubgroupAVCType()) && \"CK_ZeroToOCLEvent cast on non-event type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2274, __PRETTY_FUNCTION__)) | |||
2274 | "CK_ZeroToOCLEvent cast on non-event type")(((DestTy->isEventT() || DestTy->isQueueT() || DestTy-> isOCLIntelSubgroupAVCType()) && "CK_ZeroToOCLEvent cast on non-event type" ) ? static_cast<void> (0) : __assert_fail ("(DestTy->isEventT() || DestTy->isQueueT() || DestTy->isOCLIntelSubgroupAVCType()) && \"CK_ZeroToOCLEvent cast on non-event type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2274, __PRETTY_FUNCTION__)); | |||
2275 | return llvm::Constant::getNullValue(ConvertType(DestTy)); | |||
2276 | } | |||
2277 | ||||
2278 | case CK_IntToOCLSampler: | |||
2279 | return CGF.CGM.createOpenCLIntToSamplerConversion(E, CGF); | |||
2280 | ||||
2281 | } // end of switch | |||
2282 | ||||
2283 | llvm_unreachable("unknown scalar cast")::llvm::llvm_unreachable_internal("unknown scalar cast", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2283); | |||
2284 | } | |||
2285 | ||||
2286 | Value *ScalarExprEmitter::VisitStmtExpr(const StmtExpr *E) { | |||
2287 | CodeGenFunction::StmtExprEvaluation eval(CGF); | |||
2288 | Address RetAlloca = CGF.EmitCompoundStmt(*E->getSubStmt(), | |||
2289 | !E->getType()->isVoidType()); | |||
2290 | if (!RetAlloca.isValid()) | |||
2291 | return nullptr; | |||
2292 | return CGF.EmitLoadOfScalar(CGF.MakeAddrLValue(RetAlloca, E->getType()), | |||
2293 | E->getExprLoc()); | |||
2294 | } | |||
2295 | ||||
2296 | Value *ScalarExprEmitter::VisitExprWithCleanups(ExprWithCleanups *E) { | |||
2297 | CGF.enterFullExpression(E); | |||
2298 | CodeGenFunction::RunCleanupsScope Scope(CGF); | |||
2299 | Value *V = Visit(E->getSubExpr()); | |||
2300 | // Defend against dominance problems caused by jumps out of expression | |||
2301 | // evaluation through the shared cleanup block. | |||
2302 | Scope.ForceCleanup({&V}); | |||
2303 | return V; | |||
2304 | } | |||
2305 | ||||
2306 | //===----------------------------------------------------------------------===// | |||
2307 | // Unary Operators | |||
2308 | //===----------------------------------------------------------------------===// | |||
2309 | ||||
2310 | static BinOpInfo createBinOpInfoFromIncDec(const UnaryOperator *E, | |||
2311 | llvm::Value *InVal, bool IsInc) { | |||
2312 | BinOpInfo BinOp; | |||
2313 | BinOp.LHS = InVal; | |||
2314 | BinOp.RHS = llvm::ConstantInt::get(InVal->getType(), 1, false); | |||
2315 | BinOp.Ty = E->getType(); | |||
2316 | BinOp.Opcode = IsInc ? BO_Add : BO_Sub; | |||
2317 | // FIXME: once UnaryOperator carries FPFeatures, copy it here. | |||
2318 | BinOp.E = E; | |||
2319 | return BinOp; | |||
2320 | } | |||
2321 | ||||
2322 | llvm::Value *ScalarExprEmitter::EmitIncDecConsiderOverflowBehavior( | |||
2323 | const UnaryOperator *E, llvm::Value *InVal, bool IsInc) { | |||
2324 | llvm::Value *Amount = | |||
2325 | llvm::ConstantInt::get(InVal->getType(), IsInc ? 1 : -1, true); | |||
2326 | StringRef Name = IsInc ? "inc" : "dec"; | |||
2327 | switch (CGF.getLangOpts().getSignedOverflowBehavior()) { | |||
2328 | case LangOptions::SOB_Defined: | |||
2329 | return Builder.CreateAdd(InVal, Amount, Name); | |||
2330 | case LangOptions::SOB_Undefined: | |||
2331 | if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) | |||
2332 | return Builder.CreateNSWAdd(InVal, Amount, Name); | |||
2333 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
2334 | case LangOptions::SOB_Trapping: | |||
2335 | if (!E->canOverflow()) | |||
2336 | return Builder.CreateNSWAdd(InVal, Amount, Name); | |||
2337 | return EmitOverflowCheckedBinOp(createBinOpInfoFromIncDec(E, InVal, IsInc)); | |||
2338 | } | |||
2339 | llvm_unreachable("Unknown SignedOverflowBehaviorTy")::llvm::llvm_unreachable_internal("Unknown SignedOverflowBehaviorTy" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2339); | |||
2340 | } | |||
2341 | ||||
2342 | llvm::Value * | |||
2343 | ScalarExprEmitter::EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV, | |||
2344 | bool isInc, bool isPre) { | |||
2345 | ||||
2346 | QualType type = E->getSubExpr()->getType(); | |||
2347 | llvm::PHINode *atomicPHI = nullptr; | |||
2348 | llvm::Value *value; | |||
2349 | llvm::Value *input; | |||
2350 | ||||
2351 | int amount = (isInc ? 1 : -1); | |||
2352 | bool isSubtraction = !isInc; | |||
2353 | ||||
2354 | if (const AtomicType *atomicTy = type->getAs<AtomicType>()) { | |||
2355 | type = atomicTy->getValueType(); | |||
2356 | if (isInc && type->isBooleanType()) { | |||
2357 | llvm::Value *True = CGF.EmitToMemory(Builder.getTrue(), type); | |||
2358 | if (isPre) { | |||
2359 | Builder.CreateStore(True, LV.getAddress(), LV.isVolatileQualified()) | |||
2360 | ->setAtomic(llvm::AtomicOrdering::SequentiallyConsistent); | |||
2361 | return Builder.getTrue(); | |||
2362 | } | |||
2363 | // For atomic bool increment, we just store true and return it for | |||
2364 | // preincrement, do an atomic swap with true for postincrement | |||
2365 | return Builder.CreateAtomicRMW( | |||
2366 | llvm::AtomicRMWInst::Xchg, LV.getPointer(), True, | |||
2367 | llvm::AtomicOrdering::SequentiallyConsistent); | |||
2368 | } | |||
2369 | // Special case for atomic increment / decrement on integers, emit | |||
2370 | // atomicrmw instructions. We skip this if we want to be doing overflow | |||
2371 | // checking, and fall into the slow path with the atomic cmpxchg loop. | |||
2372 | if (!type->isBooleanType() && type->isIntegerType() && | |||
2373 | !(type->isUnsignedIntegerType() && | |||
2374 | CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) && | |||
2375 | CGF.getLangOpts().getSignedOverflowBehavior() != | |||
2376 | LangOptions::SOB_Trapping) { | |||
2377 | llvm::AtomicRMWInst::BinOp aop = isInc ? llvm::AtomicRMWInst::Add : | |||
2378 | llvm::AtomicRMWInst::Sub; | |||
2379 | llvm::Instruction::BinaryOps op = isInc ? llvm::Instruction::Add : | |||
2380 | llvm::Instruction::Sub; | |||
2381 | llvm::Value *amt = CGF.EmitToMemory( | |||
2382 | llvm::ConstantInt::get(ConvertType(type), 1, true), type); | |||
2383 | llvm::Value *old = Builder.CreateAtomicRMW(aop, | |||
2384 | LV.getPointer(), amt, llvm::AtomicOrdering::SequentiallyConsistent); | |||
2385 | return isPre ? Builder.CreateBinOp(op, old, amt) : old; | |||
2386 | } | |||
2387 | value = EmitLoadOfLValue(LV, E->getExprLoc()); | |||
2388 | input = value; | |||
2389 | // For every other atomic operation, we need to emit a load-op-cmpxchg loop | |||
2390 | llvm::BasicBlock *startBB = Builder.GetInsertBlock(); | |||
2391 | llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn); | |||
2392 | value = CGF.EmitToMemory(value, type); | |||
2393 | Builder.CreateBr(opBB); | |||
2394 | Builder.SetInsertPoint(opBB); | |||
2395 | atomicPHI = Builder.CreatePHI(value->getType(), 2); | |||
2396 | atomicPHI->addIncoming(value, startBB); | |||
2397 | value = atomicPHI; | |||
2398 | } else { | |||
2399 | value = EmitLoadOfLValue(LV, E->getExprLoc()); | |||
2400 | input = value; | |||
2401 | } | |||
2402 | ||||
2403 | // Special case of integer increment that we have to check first: bool++. | |||
2404 | // Due to promotion rules, we get: | |||
2405 | // bool++ -> bool = bool + 1 | |||
2406 | // -> bool = (int)bool + 1 | |||
2407 | // -> bool = ((int)bool + 1 != 0) | |||
2408 | // An interesting aspect of this is that increment is always true. | |||
2409 | // Decrement does not have this property. | |||
2410 | if (isInc && type->isBooleanType()) { | |||
2411 | value = Builder.getTrue(); | |||
2412 | ||||
2413 | // Most common case by far: integer increment. | |||
2414 | } else if (type->isIntegerType()) { | |||
2415 | // Note that signed integer inc/dec with width less than int can't | |||
2416 | // overflow because of promotion rules; we're just eliding a few steps here. | |||
2417 | if (E->canOverflow() && type->isSignedIntegerOrEnumerationType()) { | |||
2418 | value = EmitIncDecConsiderOverflowBehavior(E, value, isInc); | |||
2419 | } else if (E->canOverflow() && type->isUnsignedIntegerType() && | |||
2420 | CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) { | |||
2421 | value = | |||
2422 | EmitOverflowCheckedBinOp(createBinOpInfoFromIncDec(E, value, isInc)); | |||
2423 | } else { | |||
2424 | llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount, true); | |||
2425 | value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec"); | |||
2426 | } | |||
2427 | ||||
2428 | // Next most common: pointer increment. | |||
2429 | } else if (const PointerType *ptr = type->getAs<PointerType>()) { | |||
2430 | QualType type = ptr->getPointeeType(); | |||
2431 | ||||
2432 | // VLA types don't have constant size. | |||
2433 | if (const VariableArrayType *vla | |||
2434 | = CGF.getContext().getAsVariableArrayType(type)) { | |||
2435 | llvm::Value *numElts = CGF.getVLASize(vla).NumElts; | |||
2436 | if (!isInc) numElts = Builder.CreateNSWNeg(numElts, "vla.negsize"); | |||
2437 | if (CGF.getLangOpts().isSignedOverflowDefined()) | |||
2438 | value = Builder.CreateGEP(value, numElts, "vla.inc"); | |||
2439 | else | |||
2440 | value = CGF.EmitCheckedInBoundsGEP( | |||
2441 | value, numElts, /*SignedIndices=*/false, isSubtraction, | |||
2442 | E->getExprLoc(), "vla.inc"); | |||
2443 | ||||
2444 | // Arithmetic on function pointers (!) is just +-1. | |||
2445 | } else if (type->isFunctionType()) { | |||
2446 | llvm::Value *amt = Builder.getInt32(amount); | |||
2447 | ||||
2448 | value = CGF.EmitCastToVoidPtr(value); | |||
2449 | if (CGF.getLangOpts().isSignedOverflowDefined()) | |||
2450 | value = Builder.CreateGEP(value, amt, "incdec.funcptr"); | |||
2451 | else | |||
2452 | value = CGF.EmitCheckedInBoundsGEP(value, amt, /*SignedIndices=*/false, | |||
2453 | isSubtraction, E->getExprLoc(), | |||
2454 | "incdec.funcptr"); | |||
2455 | value = Builder.CreateBitCast(value, input->getType()); | |||
2456 | ||||
2457 | // For everything else, we can just do a simple increment. | |||
2458 | } else { | |||
2459 | llvm::Value *amt = Builder.getInt32(amount); | |||
2460 | if (CGF.getLangOpts().isSignedOverflowDefined()) | |||
2461 | value = Builder.CreateGEP(value, amt, "incdec.ptr"); | |||
2462 | else | |||
2463 | value = CGF.EmitCheckedInBoundsGEP(value, amt, /*SignedIndices=*/false, | |||
2464 | isSubtraction, E->getExprLoc(), | |||
2465 | "incdec.ptr"); | |||
2466 | } | |||
2467 | ||||
2468 | // Vector increment/decrement. | |||
2469 | } else if (type->isVectorType()) { | |||
2470 | if (type->hasIntegerRepresentation()) { | |||
2471 | llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount); | |||
2472 | ||||
2473 | value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec"); | |||
2474 | } else { | |||
2475 | value = Builder.CreateFAdd( | |||
2476 | value, | |||
2477 | llvm::ConstantFP::get(value->getType(), amount), | |||
2478 | isInc ? "inc" : "dec"); | |||
2479 | } | |||
2480 | ||||
2481 | // Floating point. | |||
2482 | } else if (type->isRealFloatingType()) { | |||
2483 | // Add the inc/dec to the real part. | |||
2484 | llvm::Value *amt; | |||
2485 | ||||
2486 | if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) { | |||
2487 | // Another special case: half FP increment should be done via float | |||
2488 | if (CGF.getContext().getTargetInfo().useFP16ConversionIntrinsics()) { | |||
2489 | value = Builder.CreateCall( | |||
2490 | CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16, | |||
2491 | CGF.CGM.FloatTy), | |||
2492 | input, "incdec.conv"); | |||
2493 | } else { | |||
2494 | value = Builder.CreateFPExt(input, CGF.CGM.FloatTy, "incdec.conv"); | |||
2495 | } | |||
2496 | } | |||
2497 | ||||
2498 | if (value->getType()->isFloatTy()) | |||
2499 | amt = llvm::ConstantFP::get(VMContext, | |||
2500 | llvm::APFloat(static_cast<float>(amount))); | |||
2501 | else if (value->getType()->isDoubleTy()) | |||
2502 | amt = llvm::ConstantFP::get(VMContext, | |||
2503 | llvm::APFloat(static_cast<double>(amount))); | |||
2504 | else { | |||
2505 | // Remaining types are Half, LongDouble or __float128. Convert from float. | |||
2506 | llvm::APFloat F(static_cast<float>(amount)); | |||
2507 | bool ignored; | |||
2508 | const llvm::fltSemantics *FS; | |||
2509 | // Don't use getFloatTypeSemantics because Half isn't | |||
2510 | // necessarily represented using the "half" LLVM type. | |||
2511 | if (value->getType()->isFP128Ty()) | |||
2512 | FS = &CGF.getTarget().getFloat128Format(); | |||
2513 | else if (value->getType()->isHalfTy()) | |||
2514 | FS = &CGF.getTarget().getHalfFormat(); | |||
2515 | else | |||
2516 | FS = &CGF.getTarget().getLongDoubleFormat(); | |||
2517 | F.convert(*FS, llvm::APFloat::rmTowardZero, &ignored); | |||
2518 | amt = llvm::ConstantFP::get(VMContext, F); | |||
2519 | } | |||
2520 | value = Builder.CreateFAdd(value, amt, isInc ? "inc" : "dec"); | |||
2521 | ||||
2522 | if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) { | |||
2523 | if (CGF.getContext().getTargetInfo().useFP16ConversionIntrinsics()) { | |||
2524 | value = Builder.CreateCall( | |||
2525 | CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16, | |||
2526 | CGF.CGM.FloatTy), | |||
2527 | value, "incdec.conv"); | |||
2528 | } else { | |||
2529 | value = Builder.CreateFPTrunc(value, input->getType(), "incdec.conv"); | |||
2530 | } | |||
2531 | } | |||
2532 | ||||
2533 | // Objective-C pointer types. | |||
2534 | } else { | |||
2535 | const ObjCObjectPointerType *OPT = type->castAs<ObjCObjectPointerType>(); | |||
2536 | value = CGF.EmitCastToVoidPtr(value); | |||
2537 | ||||
2538 | CharUnits size = CGF.getContext().getTypeSizeInChars(OPT->getObjectType()); | |||
2539 | if (!isInc) size = -size; | |||
2540 | llvm::Value *sizeValue = | |||
2541 | llvm::ConstantInt::get(CGF.SizeTy, size.getQuantity()); | |||
2542 | ||||
2543 | if (CGF.getLangOpts().isSignedOverflowDefined()) | |||
2544 | value = Builder.CreateGEP(value, sizeValue, "incdec.objptr"); | |||
2545 | else | |||
2546 | value = CGF.EmitCheckedInBoundsGEP(value, sizeValue, | |||
2547 | /*SignedIndices=*/false, isSubtraction, | |||
2548 | E->getExprLoc(), "incdec.objptr"); | |||
2549 | value = Builder.CreateBitCast(value, input->getType()); | |||
2550 | } | |||
2551 | ||||
2552 | if (atomicPHI) { | |||
2553 | llvm::BasicBlock *curBlock = Builder.GetInsertBlock(); | |||
2554 | llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn); | |||
2555 | auto Pair = CGF.EmitAtomicCompareExchange( | |||
2556 | LV, RValue::get(atomicPHI), RValue::get(value), E->getExprLoc()); | |||
2557 | llvm::Value *old = CGF.EmitToMemory(Pair.first.getScalarVal(), type); | |||
2558 | llvm::Value *success = Pair.second; | |||
2559 | atomicPHI->addIncoming(old, curBlock); | |||
2560 | Builder.CreateCondBr(success, contBB, atomicPHI->getParent()); | |||
2561 | Builder.SetInsertPoint(contBB); | |||
2562 | return isPre ? value : input; | |||
2563 | } | |||
2564 | ||||
2565 | // Store the updated result through the lvalue. | |||
2566 | if (LV.isBitField()) | |||
2567 | CGF.EmitStoreThroughBitfieldLValue(RValue::get(value), LV, &value); | |||
2568 | else | |||
2569 | CGF.EmitStoreThroughLValue(RValue::get(value), LV); | |||
2570 | ||||
2571 | // If this is a postinc, return the value read from memory, otherwise use the | |||
2572 | // updated value. | |||
2573 | return isPre ? value : input; | |||
2574 | } | |||
2575 | ||||
2576 | ||||
2577 | ||||
2578 | Value *ScalarExprEmitter::VisitUnaryMinus(const UnaryOperator *E) { | |||
2579 | TestAndClearIgnoreResultAssign(); | |||
2580 | // Emit unary minus with EmitSub so we handle overflow cases etc. | |||
2581 | BinOpInfo BinOp; | |||
2582 | BinOp.RHS = Visit(E->getSubExpr()); | |||
2583 | ||||
2584 | if (BinOp.RHS->getType()->isFPOrFPVectorTy()) | |||
2585 | BinOp.LHS = llvm::ConstantFP::getZeroValueForNegation(BinOp.RHS->getType()); | |||
2586 | else | |||
2587 | BinOp.LHS = llvm::Constant::getNullValue(BinOp.RHS->getType()); | |||
2588 | BinOp.Ty = E->getType(); | |||
2589 | BinOp.Opcode = BO_Sub; | |||
2590 | // FIXME: once UnaryOperator carries FPFeatures, copy it here. | |||
2591 | BinOp.E = E; | |||
2592 | return EmitSub(BinOp); | |||
2593 | } | |||
2594 | ||||
2595 | Value *ScalarExprEmitter::VisitUnaryNot(const UnaryOperator *E) { | |||
2596 | TestAndClearIgnoreResultAssign(); | |||
2597 | Value *Op = Visit(E->getSubExpr()); | |||
2598 | return Builder.CreateNot(Op, "neg"); | |||
2599 | } | |||
2600 | ||||
2601 | Value *ScalarExprEmitter::VisitUnaryLNot(const UnaryOperator *E) { | |||
2602 | // Perform vector logical not on comparison with zero vector. | |||
2603 | if (E->getType()->isExtVectorType()) { | |||
2604 | Value *Oper = Visit(E->getSubExpr()); | |||
2605 | Value *Zero = llvm::Constant::getNullValue(Oper->getType()); | |||
2606 | Value *Result; | |||
2607 | if (Oper->getType()->isFPOrFPVectorTy()) | |||
2608 | Result = Builder.CreateFCmp(llvm::CmpInst::FCMP_OEQ, Oper, Zero, "cmp"); | |||
2609 | else | |||
2610 | Result = Builder.CreateICmp(llvm::CmpInst::ICMP_EQ, Oper, Zero, "cmp"); | |||
2611 | return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext"); | |||
2612 | } | |||
2613 | ||||
2614 | // Compare operand to zero. | |||
2615 | Value *BoolVal = CGF.EvaluateExprAsBool(E->getSubExpr()); | |||
2616 | ||||
2617 | // Invert value. | |||
2618 | // TODO: Could dynamically modify easy computations here. For example, if | |||
2619 | // the operand is an icmp ne, turn into icmp eq. | |||
2620 | BoolVal = Builder.CreateNot(BoolVal, "lnot"); | |||
2621 | ||||
2622 | // ZExt result to the expr type. | |||
2623 | return Builder.CreateZExt(BoolVal, ConvertType(E->getType()), "lnot.ext"); | |||
2624 | } | |||
2625 | ||||
2626 | Value *ScalarExprEmitter::VisitOffsetOfExpr(OffsetOfExpr *E) { | |||
2627 | // Try folding the offsetof to a constant. | |||
2628 | Expr::EvalResult EVResult; | |||
2629 | if (E->EvaluateAsInt(EVResult, CGF.getContext())) { | |||
| ||||
2630 | llvm::APSInt Value = EVResult.Val.getInt(); | |||
2631 | return Builder.getInt(Value); | |||
2632 | } | |||
2633 | ||||
2634 | // Loop over the components of the offsetof to compute the value. | |||
2635 | unsigned n = E->getNumComponents(); | |||
2636 | llvm::Type* ResultType = ConvertType(E->getType()); | |||
2637 | llvm::Value* Result = llvm::Constant::getNullValue(ResultType); | |||
2638 | QualType CurrentType = E->getTypeSourceInfo()->getType(); | |||
2639 | for (unsigned i = 0; i != n; ++i) { | |||
2640 | OffsetOfNode ON = E->getComponent(i); | |||
2641 | llvm::Value *Offset = nullptr; | |||
2642 | switch (ON.getKind()) { | |||
2643 | case OffsetOfNode::Array: { | |||
2644 | // Compute the index | |||
2645 | Expr *IdxExpr = E->getIndexExpr(ON.getArrayExprIndex()); | |||
2646 | llvm::Value* Idx = CGF.EmitScalarExpr(IdxExpr); | |||
2647 | bool IdxSigned = IdxExpr->getType()->isSignedIntegerOrEnumerationType(); | |||
2648 | Idx = Builder.CreateIntCast(Idx, ResultType, IdxSigned, "conv"); | |||
2649 | ||||
2650 | // Save the element type | |||
2651 | CurrentType = | |||
2652 | CGF.getContext().getAsArrayType(CurrentType)->getElementType(); | |||
2653 | ||||
2654 | // Compute the element size | |||
2655 | llvm::Value* ElemSize = llvm::ConstantInt::get(ResultType, | |||
2656 | CGF.getContext().getTypeSizeInChars(CurrentType).getQuantity()); | |||
2657 | ||||
2658 | // Multiply out to compute the result | |||
2659 | Offset = Builder.CreateMul(Idx, ElemSize); | |||
2660 | break; | |||
2661 | } | |||
2662 | ||||
2663 | case OffsetOfNode::Field: { | |||
2664 | FieldDecl *MemberDecl = ON.getField(); | |||
2665 | RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl(); | |||
2666 | const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD); | |||
2667 | ||||
2668 | // Compute the index of the field in its parent. | |||
2669 | unsigned i = 0; | |||
2670 | // FIXME: It would be nice if we didn't have to loop here! | |||
2671 | for (RecordDecl::field_iterator Field = RD->field_begin(), | |||
2672 | FieldEnd = RD->field_end(); | |||
2673 | Field != FieldEnd; ++Field, ++i) { | |||
2674 | if (*Field == MemberDecl) | |||
2675 | break; | |||
2676 | } | |||
2677 | assert(i < RL.getFieldCount() && "offsetof field in wrong type")((i < RL.getFieldCount() && "offsetof field in wrong type" ) ? static_cast<void> (0) : __assert_fail ("i < RL.getFieldCount() && \"offsetof field in wrong type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2677, __PRETTY_FUNCTION__)); | |||
2678 | ||||
2679 | // Compute the offset to the field | |||
2680 | int64_t OffsetInt = RL.getFieldOffset(i) / | |||
2681 | CGF.getContext().getCharWidth(); | |||
2682 | Offset = llvm::ConstantInt::get(ResultType, OffsetInt); | |||
2683 | ||||
2684 | // Save the element type. | |||
2685 | CurrentType = MemberDecl->getType(); | |||
2686 | break; | |||
2687 | } | |||
2688 | ||||
2689 | case OffsetOfNode::Identifier: | |||
2690 | llvm_unreachable("dependent __builtin_offsetof")::llvm::llvm_unreachable_internal("dependent __builtin_offsetof" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2690); | |||
2691 | ||||
2692 | case OffsetOfNode::Base: { | |||
2693 | if (ON.getBase()->isVirtual()) { | |||
2694 | CGF.ErrorUnsupported(E, "virtual base in offsetof"); | |||
2695 | continue; | |||
2696 | } | |||
2697 | ||||
2698 | RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl(); | |||
| ||||
2699 | const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD); | |||
2700 | ||||
2701 | // Save the element type. | |||
2702 | CurrentType = ON.getBase()->getType(); | |||
2703 | ||||
2704 | // Compute the offset to the base. | |||
2705 | const RecordType *BaseRT = CurrentType->getAs<RecordType>(); | |||
2706 | CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); | |||
2707 | CharUnits OffsetInt = RL.getBaseClassOffset(BaseRD); | |||
2708 | Offset = llvm::ConstantInt::get(ResultType, OffsetInt.getQuantity()); | |||
2709 | break; | |||
2710 | } | |||
2711 | } | |||
2712 | Result = Builder.CreateAdd(Result, Offset); | |||
2713 | } | |||
2714 | return Result; | |||
2715 | } | |||
2716 | ||||
2717 | /// VisitUnaryExprOrTypeTraitExpr - Return the size or alignment of the type of | |||
2718 | /// argument of the sizeof expression as an integer. | |||
2719 | Value * | |||
2720 | ScalarExprEmitter::VisitUnaryExprOrTypeTraitExpr( | |||
2721 | const UnaryExprOrTypeTraitExpr *E) { | |||
2722 | QualType TypeToSize = E->getTypeOfArgument(); | |||
2723 | if (E->getKind() == UETT_SizeOf) { | |||
2724 | if (const VariableArrayType *VAT = | |||
2725 | CGF.getContext().getAsVariableArrayType(TypeToSize)) { | |||
2726 | if (E->isArgumentType()) { | |||
2727 | // sizeof(type) - make sure to emit the VLA size. | |||
2728 | CGF.EmitVariablyModifiedType(TypeToSize); | |||
2729 | } else { | |||
2730 | // C99 6.5.3.4p2: If the argument is an expression of type | |||
2731 | // VLA, it is evaluated. | |||
2732 | CGF.EmitIgnoredExpr(E->getArgumentExpr()); | |||
2733 | } | |||
2734 | ||||
2735 | auto VlaSize = CGF.getVLASize(VAT); | |||
2736 | llvm::Value *size = VlaSize.NumElts; | |||
2737 | ||||
2738 | // Scale the number of non-VLA elements by the non-VLA element size. | |||
2739 | CharUnits eltSize = CGF.getContext().getTypeSizeInChars(VlaSize.Type); | |||
2740 | if (!eltSize.isOne()) | |||
2741 | size = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), size); | |||
2742 | ||||
2743 | return size; | |||
2744 | } | |||
2745 | } else if (E->getKind() == UETT_OpenMPRequiredSimdAlign) { | |||
2746 | auto Alignment = | |||
2747 | CGF.getContext() | |||
2748 | .toCharUnitsFromBits(CGF.getContext().getOpenMPDefaultSimdAlign( | |||
2749 | E->getTypeOfArgument()->getPointeeType())) | |||
2750 | .getQuantity(); | |||
2751 | return llvm::ConstantInt::get(CGF.SizeTy, Alignment); | |||
2752 | } | |||
2753 | ||||
2754 | // If this isn't sizeof(vla), the result must be constant; use the constant | |||
2755 | // folding logic so we don't have to duplicate it here. | |||
2756 | return Builder.getInt(E->EvaluateKnownConstInt(CGF.getContext())); | |||
2757 | } | |||
2758 | ||||
2759 | Value *ScalarExprEmitter::VisitUnaryReal(const UnaryOperator *E) { | |||
2760 | Expr *Op = E->getSubExpr(); | |||
2761 | if (Op->getType()->isAnyComplexType()) { | |||
2762 | // If it's an l-value, load through the appropriate subobject l-value. | |||
2763 | // Note that we have to ask E because Op might be an l-value that | |||
2764 | // this won't work for, e.g. an Obj-C property. | |||
2765 | if (E->isGLValue()) | |||
2766 | return CGF.EmitLoadOfLValue(CGF.EmitLValue(E), | |||
2767 | E->getExprLoc()).getScalarVal(); | |||
2768 | ||||
2769 | // Otherwise, calculate and project. | |||
2770 | return CGF.EmitComplexExpr(Op, false, true).first; | |||
2771 | } | |||
2772 | ||||
2773 | return Visit(Op); | |||
2774 | } | |||
2775 | ||||
2776 | Value *ScalarExprEmitter::VisitUnaryImag(const UnaryOperator *E) { | |||
2777 | Expr *Op = E->getSubExpr(); | |||
2778 | if (Op->getType()->isAnyComplexType()) { | |||
2779 | // If it's an l-value, load through the appropriate subobject l-value. | |||
2780 | // Note that we have to ask E because Op might be an l-value that | |||
2781 | // this won't work for, e.g. an Obj-C property. | |||
2782 | if (Op->isGLValue()) | |||
2783 | return CGF.EmitLoadOfLValue(CGF.EmitLValue(E), | |||
2784 | E->getExprLoc()).getScalarVal(); | |||
2785 | ||||
2786 | // Otherwise, calculate and project. | |||
2787 | return CGF.EmitComplexExpr(Op, true, false).second; | |||
2788 | } | |||
2789 | ||||
2790 | // __imag on a scalar returns zero. Emit the subexpr to ensure side | |||
2791 | // effects are evaluated, but not the actual value. | |||
2792 | if (Op->isGLValue()) | |||
2793 | CGF.EmitLValue(Op); | |||
2794 | else | |||
2795 | CGF.EmitScalarExpr(Op, true); | |||
2796 | return llvm::Constant::getNullValue(ConvertType(E->getType())); | |||
2797 | } | |||
2798 | ||||
2799 | //===----------------------------------------------------------------------===// | |||
2800 | // Binary Operators | |||
2801 | //===----------------------------------------------------------------------===// | |||
2802 | ||||
2803 | BinOpInfo ScalarExprEmitter::EmitBinOps(const BinaryOperator *E) { | |||
2804 | TestAndClearIgnoreResultAssign(); | |||
2805 | BinOpInfo Result; | |||
2806 | Result.LHS = Visit(E->getLHS()); | |||
2807 | Result.RHS = Visit(E->getRHS()); | |||
2808 | Result.Ty = E->getType(); | |||
2809 | Result.Opcode = E->getOpcode(); | |||
2810 | Result.FPFeatures = E->getFPFeatures(); | |||
2811 | Result.E = E; | |||
2812 | return Result; | |||
2813 | } | |||
2814 | ||||
2815 | LValue ScalarExprEmitter::EmitCompoundAssignLValue( | |||
2816 | const CompoundAssignOperator *E, | |||
2817 | Value *(ScalarExprEmitter::*Func)(const BinOpInfo &), | |||
2818 | Value *&Result) { | |||
2819 | QualType LHSTy = E->getLHS()->getType(); | |||
2820 | BinOpInfo OpInfo; | |||
2821 | ||||
2822 | if (E->getComputationResultType()->isAnyComplexType()) | |||
2823 | return CGF.EmitScalarCompoundAssignWithComplex(E, Result); | |||
2824 | ||||
2825 | // Emit the RHS first. __block variables need to have the rhs evaluated | |||
2826 | // first, plus this should improve codegen a little. | |||
2827 | OpInfo.RHS = Visit(E->getRHS()); | |||
2828 | OpInfo.Ty = E->getComputationResultType(); | |||
2829 | OpInfo.Opcode = E->getOpcode(); | |||
2830 | OpInfo.FPFeatures = E->getFPFeatures(); | |||
2831 | OpInfo.E = E; | |||
2832 | // Load/convert the LHS. | |||
2833 | LValue LHSLV = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store); | |||
2834 | ||||
2835 | llvm::PHINode *atomicPHI = nullptr; | |||
2836 | if (const AtomicType *atomicTy = LHSTy->getAs<AtomicType>()) { | |||
2837 | QualType type = atomicTy->getValueType(); | |||
2838 | if (!type->isBooleanType() && type->isIntegerType() && | |||
2839 | !(type->isUnsignedIntegerType() && | |||
2840 | CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow)) && | |||
2841 | CGF.getLangOpts().getSignedOverflowBehavior() != | |||
2842 | LangOptions::SOB_Trapping) { | |||
2843 | llvm::AtomicRMWInst::BinOp aop = llvm::AtomicRMWInst::BAD_BINOP; | |||
2844 | switch (OpInfo.Opcode) { | |||
2845 | // We don't have atomicrmw operands for *, %, /, <<, >> | |||
2846 | case BO_MulAssign: case BO_DivAssign: | |||
2847 | case BO_RemAssign: | |||
2848 | case BO_ShlAssign: | |||
2849 | case BO_ShrAssign: | |||
2850 | break; | |||
2851 | case BO_AddAssign: | |||
2852 | aop = llvm::AtomicRMWInst::Add; | |||
2853 | break; | |||
2854 | case BO_SubAssign: | |||
2855 | aop = llvm::AtomicRMWInst::Sub; | |||
2856 | break; | |||
2857 | case BO_AndAssign: | |||
2858 | aop = llvm::AtomicRMWInst::And; | |||
2859 | break; | |||
2860 | case BO_XorAssign: | |||
2861 | aop = llvm::AtomicRMWInst::Xor; | |||
2862 | break; | |||
2863 | case BO_OrAssign: | |||
2864 | aop = llvm::AtomicRMWInst::Or; | |||
2865 | break; | |||
2866 | default: | |||
2867 | llvm_unreachable("Invalid compound assignment type")::llvm::llvm_unreachable_internal("Invalid compound assignment type" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 2867); | |||
2868 | } | |||
2869 | if (aop != llvm::AtomicRMWInst::BAD_BINOP) { | |||
2870 | llvm::Value *amt = CGF.EmitToMemory( | |||
2871 | EmitScalarConversion(OpInfo.RHS, E->getRHS()->getType(), LHSTy, | |||
2872 | E->getExprLoc()), | |||
2873 | LHSTy); | |||
2874 | Builder.CreateAtomicRMW(aop, LHSLV.getPointer(), amt, | |||
2875 | llvm::AtomicOrdering::SequentiallyConsistent); | |||
2876 | return LHSLV; | |||
2877 | } | |||
2878 | } | |||
2879 | // FIXME: For floating point types, we should be saving and restoring the | |||
2880 | // floating point environment in the loop. | |||
2881 | llvm::BasicBlock *startBB = Builder.GetInsertBlock(); | |||
2882 | llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn); | |||
2883 | OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc()); | |||
2884 | OpInfo.LHS = CGF.EmitToMemory(OpInfo.LHS, type); | |||
2885 | Builder.CreateBr(opBB); | |||
2886 | Builder.SetInsertPoint(opBB); | |||
2887 | atomicPHI = Builder.CreatePHI(OpInfo.LHS->getType(), 2); | |||
2888 | atomicPHI->addIncoming(OpInfo.LHS, startBB); | |||
2889 | OpInfo.LHS = atomicPHI; | |||
2890 | } | |||
2891 | else | |||
2892 | OpInfo.LHS = EmitLoadOfLValue(LHSLV, E->getExprLoc()); | |||
2893 | ||||
2894 | SourceLocation Loc = E->getExprLoc(); | |||
2895 | OpInfo.LHS = | |||
2896 | EmitScalarConversion(OpInfo.LHS, LHSTy, E->getComputationLHSType(), Loc); | |||
2897 | ||||
2898 | // Expand the binary operator. | |||
2899 | Result = (this->*Func)(OpInfo); | |||
2900 | ||||
2901 | // Convert the result back to the LHS type, | |||
2902 | // potentially with Implicit Conversion sanitizer check. | |||
2903 | Result = EmitScalarConversion(Result, E->getComputationResultType(), LHSTy, | |||
2904 | Loc, ScalarConversionOpts(CGF.SanOpts)); | |||
2905 | ||||
2906 | if (atomicPHI) { | |||
2907 | llvm::BasicBlock *curBlock = Builder.GetInsertBlock(); | |||
2908 | llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn); | |||
2909 | auto Pair = CGF.EmitAtomicCompareExchange( | |||
2910 | LHSLV, RValue::get(atomicPHI), RValue::get(Result), E->getExprLoc()); | |||
2911 | llvm::Value *old = CGF.EmitToMemory(Pair.first.getScalarVal(), LHSTy); | |||
2912 | llvm::Value *success = Pair.second; | |||
2913 | atomicPHI->addIncoming(old, curBlock); | |||
2914 | Builder.CreateCondBr(success, contBB, atomicPHI->getParent()); | |||
2915 | Builder.SetInsertPoint(contBB); | |||
2916 | return LHSLV; | |||
2917 | } | |||
2918 | ||||
2919 | // Store the result value into the LHS lvalue. Bit-fields are handled | |||
2920 | // specially because the result is altered by the store, i.e., [C99 6.5.16p1] | |||
2921 | // 'An assignment expression has the value of the left operand after the | |||
2922 | // assignment...'. | |||
2923 | if (LHSLV.isBitField()) | |||
2924 | CGF.EmitStoreThroughBitfieldLValue(RValue::get(Result), LHSLV, &Result); | |||
2925 | else | |||
2926 | CGF.EmitStoreThroughLValue(RValue::get(Result), LHSLV); | |||
2927 | ||||
2928 | return LHSLV; | |||
2929 | } | |||
2930 | ||||
2931 | Value *ScalarExprEmitter::EmitCompoundAssign(const CompoundAssignOperator *E, | |||
2932 | Value *(ScalarExprEmitter::*Func)(const BinOpInfo &)) { | |||
2933 | bool Ignore = TestAndClearIgnoreResultAssign(); | |||
2934 | Value *RHS = nullptr; | |||
2935 | LValue LHS = EmitCompoundAssignLValue(E, Func, RHS); | |||
2936 | ||||
2937 | // If the result is clearly ignored, return now. | |||
2938 | if (Ignore) | |||
2939 | return nullptr; | |||
2940 | ||||
2941 | // The result of an assignment in C is the assigned r-value. | |||
2942 | if (!CGF.getLangOpts().CPlusPlus) | |||
2943 | return RHS; | |||
2944 | ||||
2945 | // If the lvalue is non-volatile, return the computed value of the assignment. | |||
2946 | if (!LHS.isVolatileQualified()) | |||
2947 | return RHS; | |||
2948 | ||||
2949 | // Otherwise, reload the value. | |||
2950 | return EmitLoadOfLValue(LHS, E->getExprLoc()); | |||
2951 | } | |||
2952 | ||||
2953 | void ScalarExprEmitter::EmitUndefinedBehaviorIntegerDivAndRemCheck( | |||
2954 | const BinOpInfo &Ops, llvm::Value *Zero, bool isDiv) { | |||
2955 | SmallVector<std::pair<llvm::Value *, SanitizerMask>, 2> Checks; | |||
2956 | ||||
2957 | if (CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero)) { | |||
2958 | Checks.push_back(std::make_pair(Builder.CreateICmpNE(Ops.RHS, Zero), | |||
2959 | SanitizerKind::IntegerDivideByZero)); | |||
2960 | } | |||
2961 | ||||
2962 | const auto *BO = cast<BinaryOperator>(Ops.E); | |||
2963 | if (CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow) && | |||
2964 | Ops.Ty->hasSignedIntegerRepresentation() && | |||
2965 | !IsWidenedIntegerOp(CGF.getContext(), BO->getLHS()) && | |||
2966 | Ops.mayHaveIntegerOverflow()) { | |||
2967 | llvm::IntegerType *Ty = cast<llvm::IntegerType>(Zero->getType()); | |||
2968 | ||||
2969 | llvm::Value *IntMin = | |||
2970 | Builder.getInt(llvm::APInt::getSignedMinValue(Ty->getBitWidth())); | |||
2971 | llvm::Value *NegOne = llvm::ConstantInt::get(Ty, -1ULL); | |||
2972 | ||||
2973 | llvm::Value *LHSCmp = Builder.CreateICmpNE(Ops.LHS, IntMin); | |||
2974 | llvm::Value *RHSCmp = Builder.CreateICmpNE(Ops.RHS, NegOne); | |||
2975 | llvm::Value *NotOverflow = Builder.CreateOr(LHSCmp, RHSCmp, "or"); | |||
2976 | Checks.push_back( | |||
2977 | std::make_pair(NotOverflow, SanitizerKind::SignedIntegerOverflow)); | |||
2978 | } | |||
2979 | ||||
2980 | if (Checks.size() > 0) | |||
2981 | EmitBinOpCheck(Checks, Ops); | |||
2982 | } | |||
2983 | ||||
2984 | Value *ScalarExprEmitter::EmitDiv(const BinOpInfo &Ops) { | |||
2985 | { | |||
2986 | CodeGenFunction::SanitizerScope SanScope(&CGF); | |||
2987 | if ((CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero) || | |||
2988 | CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) && | |||
2989 | Ops.Ty->isIntegerType() && | |||
2990 | (Ops.mayHaveIntegerDivisionByZero() || Ops.mayHaveIntegerOverflow())) { | |||
2991 | llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty)); | |||
2992 | EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, true); | |||
2993 | } else if (CGF.SanOpts.has(SanitizerKind::FloatDivideByZero) && | |||
2994 | Ops.Ty->isRealFloatingType() && | |||
2995 | Ops.mayHaveFloatDivisionByZero()) { | |||
2996 | llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty)); | |||
2997 | llvm::Value *NonZero = Builder.CreateFCmpUNE(Ops.RHS, Zero); | |||
2998 | EmitBinOpCheck(std::make_pair(NonZero, SanitizerKind::FloatDivideByZero), | |||
2999 | Ops); | |||
3000 | } | |||
3001 | } | |||
3002 | ||||
3003 | if (Ops.LHS->getType()->isFPOrFPVectorTy()) { | |||
3004 | llvm::Value *Val = Builder.CreateFDiv(Ops.LHS, Ops.RHS, "div"); | |||
3005 | if (CGF.getLangOpts().OpenCL && | |||
3006 | !CGF.CGM.getCodeGenOpts().CorrectlyRoundedDivSqrt) { | |||
3007 | // OpenCL v1.1 s7.4: minimum accuracy of single precision / is 2.5ulp | |||
3008 | // OpenCL v1.2 s5.6.4.2: The -cl-fp32-correctly-rounded-divide-sqrt | |||
3009 | // build option allows an application to specify that single precision | |||
3010 | // floating-point divide (x/y and 1/x) and sqrt used in the program | |||
3011 | // source are correctly rounded. | |||
3012 | llvm::Type *ValTy = Val->getType(); | |||
3013 | if (ValTy->isFloatTy() || | |||
3014 | (isa<llvm::VectorType>(ValTy) && | |||
3015 | cast<llvm::VectorType>(ValTy)->getElementType()->isFloatTy())) | |||
3016 | CGF.SetFPAccuracy(Val, 2.5); | |||
3017 | } | |||
3018 | return Val; | |||
3019 | } | |||
3020 | else if (Ops.Ty->hasUnsignedIntegerRepresentation()) | |||
3021 | return Builder.CreateUDiv(Ops.LHS, Ops.RHS, "div"); | |||
3022 | else | |||
3023 | return Builder.CreateSDiv(Ops.LHS, Ops.RHS, "div"); | |||
3024 | } | |||
3025 | ||||
3026 | Value *ScalarExprEmitter::EmitRem(const BinOpInfo &Ops) { | |||
3027 | // Rem in C can't be a floating point type: C99 6.5.5p2. | |||
3028 | if ((CGF.SanOpts.has(SanitizerKind::IntegerDivideByZero) || | |||
3029 | CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) && | |||
3030 | Ops.Ty->isIntegerType() && | |||
3031 | (Ops.mayHaveIntegerDivisionByZero() || Ops.mayHaveIntegerOverflow())) { | |||
3032 | CodeGenFunction::SanitizerScope SanScope(&CGF); | |||
3033 | llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty)); | |||
3034 | EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, false); | |||
3035 | } | |||
3036 | ||||
3037 | if (Ops.Ty->hasUnsignedIntegerRepresentation()) | |||
3038 | return Builder.CreateURem(Ops.LHS, Ops.RHS, "rem"); | |||
3039 | else | |||
3040 | return Builder.CreateSRem(Ops.LHS, Ops.RHS, "rem"); | |||
3041 | } | |||
3042 | ||||
3043 | Value *ScalarExprEmitter::EmitOverflowCheckedBinOp(const BinOpInfo &Ops) { | |||
3044 | unsigned IID; | |||
3045 | unsigned OpID = 0; | |||
3046 | ||||
3047 | bool isSigned = Ops.Ty->isSignedIntegerOrEnumerationType(); | |||
3048 | switch (Ops.Opcode) { | |||
3049 | case BO_Add: | |||
3050 | case BO_AddAssign: | |||
3051 | OpID = 1; | |||
3052 | IID = isSigned ? llvm::Intrinsic::sadd_with_overflow : | |||
3053 | llvm::Intrinsic::uadd_with_overflow; | |||
3054 | break; | |||
3055 | case BO_Sub: | |||
3056 | case BO_SubAssign: | |||
3057 | OpID = 2; | |||
3058 | IID = isSigned ? llvm::Intrinsic::ssub_with_overflow : | |||
3059 | llvm::Intrinsic::usub_with_overflow; | |||
3060 | break; | |||
3061 | case BO_Mul: | |||
3062 | case BO_MulAssign: | |||
3063 | OpID = 3; | |||
3064 | IID = isSigned ? llvm::Intrinsic::smul_with_overflow : | |||
3065 | llvm::Intrinsic::umul_with_overflow; | |||
3066 | break; | |||
3067 | default: | |||
3068 | llvm_unreachable("Unsupported operation for overflow detection")::llvm::llvm_unreachable_internal("Unsupported operation for overflow detection" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3068); | |||
3069 | } | |||
3070 | OpID <<= 1; | |||
3071 | if (isSigned) | |||
3072 | OpID |= 1; | |||
3073 | ||||
3074 | CodeGenFunction::SanitizerScope SanScope(&CGF); | |||
3075 | llvm::Type *opTy = CGF.CGM.getTypes().ConvertType(Ops.Ty); | |||
3076 | ||||
3077 | llvm::Function *intrinsic = CGF.CGM.getIntrinsic(IID, opTy); | |||
3078 | ||||
3079 | Value *resultAndOverflow = Builder.CreateCall(intrinsic, {Ops.LHS, Ops.RHS}); | |||
3080 | Value *result = Builder.CreateExtractValue(resultAndOverflow, 0); | |||
3081 | Value *overflow = Builder.CreateExtractValue(resultAndOverflow, 1); | |||
3082 | ||||
3083 | // Handle overflow with llvm.trap if no custom handler has been specified. | |||
3084 | const std::string *handlerName = | |||
3085 | &CGF.getLangOpts().OverflowHandler; | |||
3086 | if (handlerName->empty()) { | |||
3087 | // If the signed-integer-overflow sanitizer is enabled, emit a call to its | |||
3088 | // runtime. Otherwise, this is a -ftrapv check, so just emit a trap. | |||
3089 | if (!isSigned || CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) { | |||
3090 | llvm::Value *NotOverflow = Builder.CreateNot(overflow); | |||
3091 | SanitizerMask Kind = isSigned ? SanitizerKind::SignedIntegerOverflow | |||
3092 | : SanitizerKind::UnsignedIntegerOverflow; | |||
3093 | EmitBinOpCheck(std::make_pair(NotOverflow, Kind), Ops); | |||
3094 | } else | |||
3095 | CGF.EmitTrapCheck(Builder.CreateNot(overflow)); | |||
3096 | return result; | |||
3097 | } | |||
3098 | ||||
3099 | // Branch in case of overflow. | |||
3100 | llvm::BasicBlock *initialBB = Builder.GetInsertBlock(); | |||
3101 | llvm::BasicBlock *continueBB = | |||
3102 | CGF.createBasicBlock("nooverflow", CGF.CurFn, initialBB->getNextNode()); | |||
3103 | llvm::BasicBlock *overflowBB = CGF.createBasicBlock("overflow", CGF.CurFn); | |||
3104 | ||||
3105 | Builder.CreateCondBr(overflow, overflowBB, continueBB); | |||
3106 | ||||
3107 | // If an overflow handler is set, then we want to call it and then use its | |||
3108 | // result, if it returns. | |||
3109 | Builder.SetInsertPoint(overflowBB); | |||
3110 | ||||
3111 | // Get the overflow handler. | |||
3112 | llvm::Type *Int8Ty = CGF.Int8Ty; | |||
3113 | llvm::Type *argTypes[] = { CGF.Int64Ty, CGF.Int64Ty, Int8Ty, Int8Ty }; | |||
3114 | llvm::FunctionType *handlerTy = | |||
3115 | llvm::FunctionType::get(CGF.Int64Ty, argTypes, true); | |||
3116 | llvm::FunctionCallee handler = | |||
3117 | CGF.CGM.CreateRuntimeFunction(handlerTy, *handlerName); | |||
3118 | ||||
3119 | // Sign extend the args to 64-bit, so that we can use the same handler for | |||
3120 | // all types of overflow. | |||
3121 | llvm::Value *lhs = Builder.CreateSExt(Ops.LHS, CGF.Int64Ty); | |||
3122 | llvm::Value *rhs = Builder.CreateSExt(Ops.RHS, CGF.Int64Ty); | |||
3123 | ||||
3124 | // Call the handler with the two arguments, the operation, and the size of | |||
3125 | // the result. | |||
3126 | llvm::Value *handlerArgs[] = { | |||
3127 | lhs, | |||
3128 | rhs, | |||
3129 | Builder.getInt8(OpID), | |||
3130 | Builder.getInt8(cast<llvm::IntegerType>(opTy)->getBitWidth()) | |||
3131 | }; | |||
3132 | llvm::Value *handlerResult = | |||
3133 | CGF.EmitNounwindRuntimeCall(handler, handlerArgs); | |||
3134 | ||||
3135 | // Truncate the result back to the desired size. | |||
3136 | handlerResult = Builder.CreateTrunc(handlerResult, opTy); | |||
3137 | Builder.CreateBr(continueBB); | |||
3138 | ||||
3139 | Builder.SetInsertPoint(continueBB); | |||
3140 | llvm::PHINode *phi = Builder.CreatePHI(opTy, 2); | |||
3141 | phi->addIncoming(result, initialBB); | |||
3142 | phi->addIncoming(handlerResult, overflowBB); | |||
3143 | ||||
3144 | return phi; | |||
3145 | } | |||
3146 | ||||
3147 | /// Emit pointer + index arithmetic. | |||
3148 | static Value *emitPointerArithmetic(CodeGenFunction &CGF, | |||
3149 | const BinOpInfo &op, | |||
3150 | bool isSubtraction) { | |||
3151 | // Must have binary (not unary) expr here. Unary pointer | |||
3152 | // increment/decrement doesn't use this path. | |||
3153 | const BinaryOperator *expr = cast<BinaryOperator>(op.E); | |||
3154 | ||||
3155 | Value *pointer = op.LHS; | |||
3156 | Expr *pointerOperand = expr->getLHS(); | |||
3157 | Value *index = op.RHS; | |||
3158 | Expr *indexOperand = expr->getRHS(); | |||
3159 | ||||
3160 | // In a subtraction, the LHS is always the pointer. | |||
3161 | if (!isSubtraction && !pointer->getType()->isPointerTy()) { | |||
3162 | std::swap(pointer, index); | |||
3163 | std::swap(pointerOperand, indexOperand); | |||
3164 | } | |||
3165 | ||||
3166 | bool isSigned = indexOperand->getType()->isSignedIntegerOrEnumerationType(); | |||
3167 | ||||
3168 | unsigned width = cast<llvm::IntegerType>(index->getType())->getBitWidth(); | |||
3169 | auto &DL = CGF.CGM.getDataLayout(); | |||
3170 | auto PtrTy = cast<llvm::PointerType>(pointer->getType()); | |||
3171 | ||||
3172 | // Some versions of glibc and gcc use idioms (particularly in their malloc | |||
3173 | // routines) that add a pointer-sized integer (known to be a pointer value) | |||
3174 | // to a null pointer in order to cast the value back to an integer or as | |||
3175 | // part of a pointer alignment algorithm. This is undefined behavior, but | |||
3176 | // we'd like to be able to compile programs that use it. | |||
3177 | // | |||
3178 | // Normally, we'd generate a GEP with a null-pointer base here in response | |||
3179 | // to that code, but it's also UB to dereference a pointer created that | |||
3180 | // way. Instead (as an acknowledged hack to tolerate the idiom) we will | |||
3181 | // generate a direct cast of the integer value to a pointer. | |||
3182 | // | |||
3183 | // The idiom (p = nullptr + N) is not met if any of the following are true: | |||
3184 | // | |||
3185 | // The operation is subtraction. | |||
3186 | // The index is not pointer-sized. | |||
3187 | // The pointer type is not byte-sized. | |||
3188 | // | |||
3189 | if (BinaryOperator::isNullPointerArithmeticExtension(CGF.getContext(), | |||
3190 | op.Opcode, | |||
3191 | expr->getLHS(), | |||
3192 | expr->getRHS())) | |||
3193 | return CGF.Builder.CreateIntToPtr(index, pointer->getType()); | |||
3194 | ||||
3195 | if (width != DL.getTypeSizeInBits(PtrTy)) { | |||
3196 | // Zero-extend or sign-extend the pointer value according to | |||
3197 | // whether the index is signed or not. | |||
3198 | index = CGF.Builder.CreateIntCast(index, DL.getIntPtrType(PtrTy), isSigned, | |||
3199 | "idx.ext"); | |||
3200 | } | |||
3201 | ||||
3202 | // If this is subtraction, negate the index. | |||
3203 | if (isSubtraction) | |||
3204 | index = CGF.Builder.CreateNeg(index, "idx.neg"); | |||
3205 | ||||
3206 | if (CGF.SanOpts.has(SanitizerKind::ArrayBounds)) | |||
3207 | CGF.EmitBoundsCheck(op.E, pointerOperand, index, indexOperand->getType(), | |||
3208 | /*Accessed*/ false); | |||
3209 | ||||
3210 | const PointerType *pointerType | |||
3211 | = pointerOperand->getType()->getAs<PointerType>(); | |||
3212 | if (!pointerType) { | |||
3213 | QualType objectType = pointerOperand->getType() | |||
3214 | ->castAs<ObjCObjectPointerType>() | |||
3215 | ->getPointeeType(); | |||
3216 | llvm::Value *objectSize | |||
3217 | = CGF.CGM.getSize(CGF.getContext().getTypeSizeInChars(objectType)); | |||
3218 | ||||
3219 | index = CGF.Builder.CreateMul(index, objectSize); | |||
3220 | ||||
3221 | Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy); | |||
3222 | result = CGF.Builder.CreateGEP(result, index, "add.ptr"); | |||
3223 | return CGF.Builder.CreateBitCast(result, pointer->getType()); | |||
3224 | } | |||
3225 | ||||
3226 | QualType elementType = pointerType->getPointeeType(); | |||
3227 | if (const VariableArrayType *vla | |||
3228 | = CGF.getContext().getAsVariableArrayType(elementType)) { | |||
3229 | // The element count here is the total number of non-VLA elements. | |||
3230 | llvm::Value *numElements = CGF.getVLASize(vla).NumElts; | |||
3231 | ||||
3232 | // Effectively, the multiply by the VLA size is part of the GEP. | |||
3233 | // GEP indexes are signed, and scaling an index isn't permitted to | |||
3234 | // signed-overflow, so we use the same semantics for our explicit | |||
3235 | // multiply. We suppress this if overflow is not undefined behavior. | |||
3236 | if (CGF.getLangOpts().isSignedOverflowDefined()) { | |||
3237 | index = CGF.Builder.CreateMul(index, numElements, "vla.index"); | |||
3238 | pointer = CGF.Builder.CreateGEP(pointer, index, "add.ptr"); | |||
3239 | } else { | |||
3240 | index = CGF.Builder.CreateNSWMul(index, numElements, "vla.index"); | |||
3241 | pointer = | |||
3242 | CGF.EmitCheckedInBoundsGEP(pointer, index, isSigned, isSubtraction, | |||
3243 | op.E->getExprLoc(), "add.ptr"); | |||
3244 | } | |||
3245 | return pointer; | |||
3246 | } | |||
3247 | ||||
3248 | // Explicitly handle GNU void* and function pointer arithmetic extensions. The | |||
3249 | // GNU void* casts amount to no-ops since our void* type is i8*, but this is | |||
3250 | // future proof. | |||
3251 | if (elementType->isVoidType() || elementType->isFunctionType()) { | |||
3252 | Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy); | |||
3253 | result = CGF.Builder.CreateGEP(result, index, "add.ptr"); | |||
3254 | return CGF.Builder.CreateBitCast(result, pointer->getType()); | |||
3255 | } | |||
3256 | ||||
3257 | if (CGF.getLangOpts().isSignedOverflowDefined()) | |||
3258 | return CGF.Builder.CreateGEP(pointer, index, "add.ptr"); | |||
3259 | ||||
3260 | return CGF.EmitCheckedInBoundsGEP(pointer, index, isSigned, isSubtraction, | |||
3261 | op.E->getExprLoc(), "add.ptr"); | |||
3262 | } | |||
3263 | ||||
3264 | // Construct an fmuladd intrinsic to represent a fused mul-add of MulOp and | |||
3265 | // Addend. Use negMul and negAdd to negate the first operand of the Mul or | |||
3266 | // the add operand respectively. This allows fmuladd to represent a*b-c, or | |||
3267 | // c-a*b. Patterns in LLVM should catch the negated forms and translate them to | |||
3268 | // efficient operations. | |||
3269 | static Value* buildFMulAdd(llvm::BinaryOperator *MulOp, Value *Addend, | |||
3270 | const CodeGenFunction &CGF, CGBuilderTy &Builder, | |||
3271 | bool negMul, bool negAdd) { | |||
3272 | assert(!(negMul && negAdd) && "Only one of negMul and negAdd should be set.")((!(negMul && negAdd) && "Only one of negMul and negAdd should be set." ) ? static_cast<void> (0) : __assert_fail ("!(negMul && negAdd) && \"Only one of negMul and negAdd should be set.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3272, __PRETTY_FUNCTION__)); | |||
3273 | ||||
3274 | Value *MulOp0 = MulOp->getOperand(0); | |||
3275 | Value *MulOp1 = MulOp->getOperand(1); | |||
3276 | if (negMul) { | |||
3277 | MulOp0 = | |||
3278 | Builder.CreateFSub( | |||
3279 | llvm::ConstantFP::getZeroValueForNegation(MulOp0->getType()), MulOp0, | |||
3280 | "neg"); | |||
3281 | } else if (negAdd) { | |||
3282 | Addend = | |||
3283 | Builder.CreateFSub( | |||
3284 | llvm::ConstantFP::getZeroValueForNegation(Addend->getType()), Addend, | |||
3285 | "neg"); | |||
3286 | } | |||
3287 | ||||
3288 | Value *FMulAdd = Builder.CreateCall( | |||
3289 | CGF.CGM.getIntrinsic(llvm::Intrinsic::fmuladd, Addend->getType()), | |||
3290 | {MulOp0, MulOp1, Addend}); | |||
3291 | MulOp->eraseFromParent(); | |||
3292 | ||||
3293 | return FMulAdd; | |||
3294 | } | |||
3295 | ||||
3296 | // Check whether it would be legal to emit an fmuladd intrinsic call to | |||
3297 | // represent op and if so, build the fmuladd. | |||
3298 | // | |||
3299 | // Checks that (a) the operation is fusable, and (b) -ffp-contract=on. | |||
3300 | // Does NOT check the type of the operation - it's assumed that this function | |||
3301 | // will be called from contexts where it's known that the type is contractable. | |||
3302 | static Value* tryEmitFMulAdd(const BinOpInfo &op, | |||
3303 | const CodeGenFunction &CGF, CGBuilderTy &Builder, | |||
3304 | bool isSub=false) { | |||
3305 | ||||
3306 | assert((op.Opcode == BO_Add || op.Opcode == BO_AddAssign ||(((op.Opcode == BO_Add || op.Opcode == BO_AddAssign || op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) && "Only fadd/fsub can be the root of an fmuladd." ) ? static_cast<void> (0) : __assert_fail ("(op.Opcode == BO_Add || op.Opcode == BO_AddAssign || op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) && \"Only fadd/fsub can be the root of an fmuladd.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3308, __PRETTY_FUNCTION__)) | |||
3307 | op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) &&(((op.Opcode == BO_Add || op.Opcode == BO_AddAssign || op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) && "Only fadd/fsub can be the root of an fmuladd." ) ? static_cast<void> (0) : __assert_fail ("(op.Opcode == BO_Add || op.Opcode == BO_AddAssign || op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) && \"Only fadd/fsub can be the root of an fmuladd.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3308, __PRETTY_FUNCTION__)) | |||
3308 | "Only fadd/fsub can be the root of an fmuladd.")(((op.Opcode == BO_Add || op.Opcode == BO_AddAssign || op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) && "Only fadd/fsub can be the root of an fmuladd." ) ? static_cast<void> (0) : __assert_fail ("(op.Opcode == BO_Add || op.Opcode == BO_AddAssign || op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) && \"Only fadd/fsub can be the root of an fmuladd.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3308, __PRETTY_FUNCTION__)); | |||
3309 | ||||
3310 | // Check whether this op is marked as fusable. | |||
3311 | if (!op.FPFeatures.allowFPContractWithinStatement()) | |||
3312 | return nullptr; | |||
3313 | ||||
3314 | // We have a potentially fusable op. Look for a mul on one of the operands. | |||
3315 | // Also, make sure that the mul result isn't used directly. In that case, | |||
3316 | // there's no point creating a muladd operation. | |||
3317 | if (auto *LHSBinOp = dyn_cast<llvm::BinaryOperator>(op.LHS)) { | |||
3318 | if (LHSBinOp->getOpcode() == llvm::Instruction::FMul && | |||
3319 | LHSBinOp->use_empty()) | |||
3320 | return buildFMulAdd(LHSBinOp, op.RHS, CGF, Builder, false, isSub); | |||
3321 | } | |||
3322 | if (auto *RHSBinOp = dyn_cast<llvm::BinaryOperator>(op.RHS)) { | |||
3323 | if (RHSBinOp->getOpcode() == llvm::Instruction::FMul && | |||
3324 | RHSBinOp->use_empty()) | |||
3325 | return buildFMulAdd(RHSBinOp, op.LHS, CGF, Builder, isSub, false); | |||
3326 | } | |||
3327 | ||||
3328 | return nullptr; | |||
3329 | } | |||
3330 | ||||
3331 | Value *ScalarExprEmitter::EmitAdd(const BinOpInfo &op) { | |||
3332 | if (op.LHS->getType()->isPointerTy() || | |||
3333 | op.RHS->getType()->isPointerTy()) | |||
3334 | return emitPointerArithmetic(CGF, op, CodeGenFunction::NotSubtraction); | |||
3335 | ||||
3336 | if (op.Ty->isSignedIntegerOrEnumerationType()) { | |||
3337 | switch (CGF.getLangOpts().getSignedOverflowBehavior()) { | |||
3338 | case LangOptions::SOB_Defined: | |||
3339 | return Builder.CreateAdd(op.LHS, op.RHS, "add"); | |||
3340 | case LangOptions::SOB_Undefined: | |||
3341 | if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) | |||
3342 | return Builder.CreateNSWAdd(op.LHS, op.RHS, "add"); | |||
3343 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
3344 | case LangOptions::SOB_Trapping: | |||
3345 | if (CanElideOverflowCheck(CGF.getContext(), op)) | |||
3346 | return Builder.CreateNSWAdd(op.LHS, op.RHS, "add"); | |||
3347 | return EmitOverflowCheckedBinOp(op); | |||
3348 | } | |||
3349 | } | |||
3350 | ||||
3351 | if (op.Ty->isUnsignedIntegerType() && | |||
3352 | CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow) && | |||
3353 | !CanElideOverflowCheck(CGF.getContext(), op)) | |||
3354 | return EmitOverflowCheckedBinOp(op); | |||
3355 | ||||
3356 | if (op.LHS->getType()->isFPOrFPVectorTy()) { | |||
3357 | // Try to form an fmuladd. | |||
3358 | if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder)) | |||
3359 | return FMulAdd; | |||
3360 | ||||
3361 | Value *V = Builder.CreateFAdd(op.LHS, op.RHS, "add"); | |||
3362 | return propagateFMFlags(V, op); | |||
3363 | } | |||
3364 | ||||
3365 | if (op.isFixedPointBinOp()) | |||
3366 | return EmitFixedPointBinOp(op); | |||
3367 | ||||
3368 | return Builder.CreateAdd(op.LHS, op.RHS, "add"); | |||
3369 | } | |||
3370 | ||||
3371 | /// The resulting value must be calculated with exact precision, so the operands | |||
3372 | /// may not be the same type. | |||
3373 | Value *ScalarExprEmitter::EmitFixedPointBinOp(const BinOpInfo &op) { | |||
3374 | using llvm::APSInt; | |||
3375 | using llvm::ConstantInt; | |||
3376 | ||||
3377 | const auto *BinOp = cast<BinaryOperator>(op.E); | |||
3378 | ||||
3379 | // The result is a fixed point type and at least one of the operands is fixed | |||
3380 | // point while the other is either fixed point or an int. This resulting type | |||
3381 | // should be determined by Sema::handleFixedPointConversions(). | |||
3382 | QualType ResultTy = op.Ty; | |||
3383 | QualType LHSTy = BinOp->getLHS()->getType(); | |||
3384 | QualType RHSTy = BinOp->getRHS()->getType(); | |||
3385 | ASTContext &Ctx = CGF.getContext(); | |||
3386 | Value *LHS = op.LHS; | |||
3387 | Value *RHS = op.RHS; | |||
3388 | ||||
3389 | auto LHSFixedSema = Ctx.getFixedPointSemantics(LHSTy); | |||
3390 | auto RHSFixedSema = Ctx.getFixedPointSemantics(RHSTy); | |||
3391 | auto ResultFixedSema = Ctx.getFixedPointSemantics(ResultTy); | |||
3392 | auto CommonFixedSema = LHSFixedSema.getCommonSemantics(RHSFixedSema); | |||
3393 | ||||
3394 | // Convert the operands to the full precision type. | |||
3395 | Value *FullLHS = EmitFixedPointConversion(LHS, LHSFixedSema, CommonFixedSema, | |||
3396 | BinOp->getExprLoc()); | |||
3397 | Value *FullRHS = EmitFixedPointConversion(RHS, RHSFixedSema, CommonFixedSema, | |||
3398 | BinOp->getExprLoc()); | |||
3399 | ||||
3400 | // Perform the actual addition. | |||
3401 | Value *Result; | |||
3402 | switch (BinOp->getOpcode()) { | |||
3403 | case BO_Add: { | |||
3404 | if (ResultFixedSema.isSaturated()) { | |||
3405 | llvm::Intrinsic::ID IID = ResultFixedSema.isSigned() | |||
3406 | ? llvm::Intrinsic::sadd_sat | |||
3407 | : llvm::Intrinsic::uadd_sat; | |||
3408 | Result = Builder.CreateBinaryIntrinsic(IID, FullLHS, FullRHS); | |||
3409 | } else { | |||
3410 | Result = Builder.CreateAdd(FullLHS, FullRHS); | |||
3411 | } | |||
3412 | break; | |||
3413 | } | |||
3414 | case BO_Sub: { | |||
3415 | if (ResultFixedSema.isSaturated()) { | |||
3416 | llvm::Intrinsic::ID IID = ResultFixedSema.isSigned() | |||
3417 | ? llvm::Intrinsic::ssub_sat | |||
3418 | : llvm::Intrinsic::usub_sat; | |||
3419 | Result = Builder.CreateBinaryIntrinsic(IID, FullLHS, FullRHS); | |||
3420 | } else { | |||
3421 | Result = Builder.CreateSub(FullLHS, FullRHS); | |||
3422 | } | |||
3423 | break; | |||
3424 | } | |||
3425 | case BO_LT: | |||
3426 | return CommonFixedSema.isSigned() ? Builder.CreateICmpSLT(FullLHS, FullRHS) | |||
3427 | : Builder.CreateICmpULT(FullLHS, FullRHS); | |||
3428 | case BO_GT: | |||
3429 | return CommonFixedSema.isSigned() ? Builder.CreateICmpSGT(FullLHS, FullRHS) | |||
3430 | : Builder.CreateICmpUGT(FullLHS, FullRHS); | |||
3431 | case BO_LE: | |||
3432 | return CommonFixedSema.isSigned() ? Builder.CreateICmpSLE(FullLHS, FullRHS) | |||
3433 | : Builder.CreateICmpULE(FullLHS, FullRHS); | |||
3434 | case BO_GE: | |||
3435 | return CommonFixedSema.isSigned() ? Builder.CreateICmpSGE(FullLHS, FullRHS) | |||
3436 | : Builder.CreateICmpUGE(FullLHS, FullRHS); | |||
3437 | case BO_EQ: | |||
3438 | // For equality operations, we assume any padding bits on unsigned types are | |||
3439 | // zero'd out. They could be overwritten through non-saturating operations | |||
3440 | // that cause overflow, but this leads to undefined behavior. | |||
3441 | return Builder.CreateICmpEQ(FullLHS, FullRHS); | |||
3442 | case BO_NE: | |||
3443 | return Builder.CreateICmpNE(FullLHS, FullRHS); | |||
3444 | case BO_Mul: | |||
3445 | case BO_Div: | |||
3446 | case BO_Shl: | |||
3447 | case BO_Shr: | |||
3448 | case BO_Cmp: | |||
3449 | case BO_LAnd: | |||
3450 | case BO_LOr: | |||
3451 | case BO_MulAssign: | |||
3452 | case BO_DivAssign: | |||
3453 | case BO_AddAssign: | |||
3454 | case BO_SubAssign: | |||
3455 | case BO_ShlAssign: | |||
3456 | case BO_ShrAssign: | |||
3457 | llvm_unreachable("Found unimplemented fixed point binary operation")::llvm::llvm_unreachable_internal("Found unimplemented fixed point binary operation" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3457); | |||
3458 | case BO_PtrMemD: | |||
3459 | case BO_PtrMemI: | |||
3460 | case BO_Rem: | |||
3461 | case BO_Xor: | |||
3462 | case BO_And: | |||
3463 | case BO_Or: | |||
3464 | case BO_Assign: | |||
3465 | case BO_RemAssign: | |||
3466 | case BO_AndAssign: | |||
3467 | case BO_XorAssign: | |||
3468 | case BO_OrAssign: | |||
3469 | case BO_Comma: | |||
3470 | llvm_unreachable("Found unsupported binary operation for fixed point types.")::llvm::llvm_unreachable_internal("Found unsupported binary operation for fixed point types." , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3470); | |||
3471 | } | |||
3472 | ||||
3473 | // Convert to the result type. | |||
3474 | return EmitFixedPointConversion(Result, CommonFixedSema, ResultFixedSema, | |||
3475 | BinOp->getExprLoc()); | |||
3476 | } | |||
3477 | ||||
3478 | Value *ScalarExprEmitter::EmitSub(const BinOpInfo &op) { | |||
3479 | // The LHS is always a pointer if either side is. | |||
3480 | if (!op.LHS->getType()->isPointerTy()) { | |||
3481 | if (op.Ty->isSignedIntegerOrEnumerationType()) { | |||
3482 | switch (CGF.getLangOpts().getSignedOverflowBehavior()) { | |||
3483 | case LangOptions::SOB_Defined: | |||
3484 | return Builder.CreateSub(op.LHS, op.RHS, "sub"); | |||
3485 | case LangOptions::SOB_Undefined: | |||
3486 | if (!CGF.SanOpts.has(SanitizerKind::SignedIntegerOverflow)) | |||
3487 | return Builder.CreateNSWSub(op.LHS, op.RHS, "sub"); | |||
3488 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
3489 | case LangOptions::SOB_Trapping: | |||
3490 | if (CanElideOverflowCheck(CGF.getContext(), op)) | |||
3491 | return Builder.CreateNSWSub(op.LHS, op.RHS, "sub"); | |||
3492 | return EmitOverflowCheckedBinOp(op); | |||
3493 | } | |||
3494 | } | |||
3495 | ||||
3496 | if (op.Ty->isUnsignedIntegerType() && | |||
3497 | CGF.SanOpts.has(SanitizerKind::UnsignedIntegerOverflow) && | |||
3498 | !CanElideOverflowCheck(CGF.getContext(), op)) | |||
3499 | return EmitOverflowCheckedBinOp(op); | |||
3500 | ||||
3501 | if (op.LHS->getType()->isFPOrFPVectorTy()) { | |||
3502 | // Try to form an fmuladd. | |||
3503 | if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder, true)) | |||
3504 | return FMulAdd; | |||
3505 | Value *V = Builder.CreateFSub(op.LHS, op.RHS, "sub"); | |||
3506 | return propagateFMFlags(V, op); | |||
3507 | } | |||
3508 | ||||
3509 | if (op.isFixedPointBinOp()) | |||
3510 | return EmitFixedPointBinOp(op); | |||
3511 | ||||
3512 | return Builder.CreateSub(op.LHS, op.RHS, "sub"); | |||
3513 | } | |||
3514 | ||||
3515 | // If the RHS is not a pointer, then we have normal pointer | |||
3516 | // arithmetic. | |||
3517 | if (!op.RHS->getType()->isPointerTy()) | |||
3518 | return emitPointerArithmetic(CGF, op, CodeGenFunction::IsSubtraction); | |||
3519 | ||||
3520 | // Otherwise, this is a pointer subtraction. | |||
3521 | ||||
3522 | // Do the raw subtraction part. | |||
3523 | llvm::Value *LHS | |||
3524 | = Builder.CreatePtrToInt(op.LHS, CGF.PtrDiffTy, "sub.ptr.lhs.cast"); | |||
3525 | llvm::Value *RHS | |||
3526 | = Builder.CreatePtrToInt(op.RHS, CGF.PtrDiffTy, "sub.ptr.rhs.cast"); | |||
3527 | Value *diffInChars = Builder.CreateSub(LHS, RHS, "sub.ptr.sub"); | |||
3528 | ||||
3529 | // Okay, figure out the element size. | |||
3530 | const BinaryOperator *expr = cast<BinaryOperator>(op.E); | |||
3531 | QualType elementType = expr->getLHS()->getType()->getPointeeType(); | |||
3532 | ||||
3533 | llvm::Value *divisor = nullptr; | |||
3534 | ||||
3535 | // For a variable-length array, this is going to be non-constant. | |||
3536 | if (const VariableArrayType *vla | |||
3537 | = CGF.getContext().getAsVariableArrayType(elementType)) { | |||
3538 | auto VlaSize = CGF.getVLASize(vla); | |||
3539 | elementType = VlaSize.Type; | |||
3540 | divisor = VlaSize.NumElts; | |||
3541 | ||||
3542 | // Scale the number of non-VLA elements by the non-VLA element size. | |||
3543 | CharUnits eltSize = CGF.getContext().getTypeSizeInChars(elementType); | |||
3544 | if (!eltSize.isOne()) | |||
3545 | divisor = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), divisor); | |||
3546 | ||||
3547 | // For everything elese, we can just compute it, safe in the | |||
3548 | // assumption that Sema won't let anything through that we can't | |||
3549 | // safely compute the size of. | |||
3550 | } else { | |||
3551 | CharUnits elementSize; | |||
3552 | // Handle GCC extension for pointer arithmetic on void* and | |||
3553 | // function pointer types. | |||
3554 | if (elementType->isVoidType() || elementType->isFunctionType()) | |||
3555 | elementSize = CharUnits::One(); | |||
3556 | else | |||
3557 | elementSize = CGF.getContext().getTypeSizeInChars(elementType); | |||
3558 | ||||
3559 | // Don't even emit the divide for element size of 1. | |||
3560 | if (elementSize.isOne()) | |||
3561 | return diffInChars; | |||
3562 | ||||
3563 | divisor = CGF.CGM.getSize(elementSize); | |||
3564 | } | |||
3565 | ||||
3566 | // Otherwise, do a full sdiv. This uses the "exact" form of sdiv, since | |||
3567 | // pointer difference in C is only defined in the case where both operands | |||
3568 | // are pointing to elements of an array. | |||
3569 | return Builder.CreateExactSDiv(diffInChars, divisor, "sub.ptr.div"); | |||
3570 | } | |||
3571 | ||||
3572 | Value *ScalarExprEmitter::GetWidthMinusOneValue(Value* LHS,Value* RHS) { | |||
3573 | llvm::IntegerType *Ty; | |||
3574 | if (llvm::VectorType *VT = dyn_cast<llvm::VectorType>(LHS->getType())) | |||
3575 | Ty = cast<llvm::IntegerType>(VT->getElementType()); | |||
3576 | else | |||
3577 | Ty = cast<llvm::IntegerType>(LHS->getType()); | |||
3578 | return llvm::ConstantInt::get(RHS->getType(), Ty->getBitWidth() - 1); | |||
3579 | } | |||
3580 | ||||
3581 | Value *ScalarExprEmitter::EmitShl(const BinOpInfo &Ops) { | |||
3582 | // LLVM requires the LHS and RHS to be the same type: promote or truncate the | |||
3583 | // RHS to the same size as the LHS. | |||
3584 | Value *RHS = Ops.RHS; | |||
3585 | if (Ops.LHS->getType() != RHS->getType()) | |||
3586 | RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom"); | |||
3587 | ||||
3588 | bool SanitizeBase = CGF.SanOpts.has(SanitizerKind::ShiftBase) && | |||
3589 | Ops.Ty->hasSignedIntegerRepresentation() && | |||
3590 | !CGF.getLangOpts().isSignedOverflowDefined() && | |||
3591 | !CGF.getLangOpts().CPlusPlus2a; | |||
3592 | bool SanitizeExponent = CGF.SanOpts.has(SanitizerKind::ShiftExponent); | |||
3593 | // OpenCL 6.3j: shift values are effectively % word size of LHS. | |||
3594 | if (CGF.getLangOpts().OpenCL) | |||
3595 | RHS = | |||
3596 | Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shl.mask"); | |||
3597 | else if ((SanitizeBase || SanitizeExponent) && | |||
3598 | isa<llvm::IntegerType>(Ops.LHS->getType())) { | |||
3599 | CodeGenFunction::SanitizerScope SanScope(&CGF); | |||
3600 | SmallVector<std::pair<Value *, SanitizerMask>, 2> Checks; | |||
3601 | llvm::Value *WidthMinusOne = GetWidthMinusOneValue(Ops.LHS, Ops.RHS); | |||
3602 | llvm::Value *ValidExponent = Builder.CreateICmpULE(Ops.RHS, WidthMinusOne); | |||
3603 | ||||
3604 | if (SanitizeExponent) { | |||
3605 | Checks.push_back( | |||
3606 | std::make_pair(ValidExponent, SanitizerKind::ShiftExponent)); | |||
3607 | } | |||
3608 | ||||
3609 | if (SanitizeBase) { | |||
3610 | // Check whether we are shifting any non-zero bits off the top of the | |||
3611 | // integer. We only emit this check if exponent is valid - otherwise | |||
3612 | // instructions below will have undefined behavior themselves. | |||
3613 | llvm::BasicBlock *Orig = Builder.GetInsertBlock(); | |||
3614 | llvm::BasicBlock *Cont = CGF.createBasicBlock("cont"); | |||
3615 | llvm::BasicBlock *CheckShiftBase = CGF.createBasicBlock("check"); | |||
3616 | Builder.CreateCondBr(ValidExponent, CheckShiftBase, Cont); | |||
3617 | llvm::Value *PromotedWidthMinusOne = | |||
3618 | (RHS == Ops.RHS) ? WidthMinusOne | |||
3619 | : GetWidthMinusOneValue(Ops.LHS, RHS); | |||
3620 | CGF.EmitBlock(CheckShiftBase); | |||
3621 | llvm::Value *BitsShiftedOff = Builder.CreateLShr( | |||
3622 | Ops.LHS, Builder.CreateSub(PromotedWidthMinusOne, RHS, "shl.zeros", | |||
3623 | /*NUW*/ true, /*NSW*/ true), | |||
3624 | "shl.check"); | |||
3625 | if (CGF.getLangOpts().CPlusPlus) { | |||
3626 | // In C99, we are not permitted to shift a 1 bit into the sign bit. | |||
3627 | // Under C++11's rules, shifting a 1 bit into the sign bit is | |||
3628 | // OK, but shifting a 1 bit out of it is not. (C89 and C++03 don't | |||
3629 | // define signed left shifts, so we use the C99 and C++11 rules there). | |||
3630 | llvm::Value *One = llvm::ConstantInt::get(BitsShiftedOff->getType(), 1); | |||
3631 | BitsShiftedOff = Builder.CreateLShr(BitsShiftedOff, One); | |||
3632 | } | |||
3633 | llvm::Value *Zero = llvm::ConstantInt::get(BitsShiftedOff->getType(), 0); | |||
3634 | llvm::Value *ValidBase = Builder.CreateICmpEQ(BitsShiftedOff, Zero); | |||
3635 | CGF.EmitBlock(Cont); | |||
3636 | llvm::PHINode *BaseCheck = Builder.CreatePHI(ValidBase->getType(), 2); | |||
3637 | BaseCheck->addIncoming(Builder.getTrue(), Orig); | |||
3638 | BaseCheck->addIncoming(ValidBase, CheckShiftBase); | |||
3639 | Checks.push_back(std::make_pair(BaseCheck, SanitizerKind::ShiftBase)); | |||
3640 | } | |||
3641 | ||||
3642 | assert(!Checks.empty())((!Checks.empty()) ? static_cast<void> (0) : __assert_fail ("!Checks.empty()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3642, __PRETTY_FUNCTION__)); | |||
3643 | EmitBinOpCheck(Checks, Ops); | |||
3644 | } | |||
3645 | ||||
3646 | return Builder.CreateShl(Ops.LHS, RHS, "shl"); | |||
3647 | } | |||
3648 | ||||
3649 | Value *ScalarExprEmitter::EmitShr(const BinOpInfo &Ops) { | |||
3650 | // LLVM requires the LHS and RHS to be the same type: promote or truncate the | |||
3651 | // RHS to the same size as the LHS. | |||
3652 | Value *RHS = Ops.RHS; | |||
3653 | if (Ops.LHS->getType() != RHS->getType()) | |||
3654 | RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom"); | |||
3655 | ||||
3656 | // OpenCL 6.3j: shift values are effectively % word size of LHS. | |||
3657 | if (CGF.getLangOpts().OpenCL) | |||
3658 | RHS = | |||
3659 | Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shr.mask"); | |||
3660 | else if (CGF.SanOpts.has(SanitizerKind::ShiftExponent) && | |||
3661 | isa<llvm::IntegerType>(Ops.LHS->getType())) { | |||
3662 | CodeGenFunction::SanitizerScope SanScope(&CGF); | |||
3663 | llvm::Value *Valid = | |||
3664 | Builder.CreateICmpULE(RHS, GetWidthMinusOneValue(Ops.LHS, RHS)); | |||
3665 | EmitBinOpCheck(std::make_pair(Valid, SanitizerKind::ShiftExponent), Ops); | |||
3666 | } | |||
3667 | ||||
3668 | if (Ops.Ty->hasUnsignedIntegerRepresentation()) | |||
3669 | return Builder.CreateLShr(Ops.LHS, RHS, "shr"); | |||
3670 | return Builder.CreateAShr(Ops.LHS, RHS, "shr"); | |||
3671 | } | |||
3672 | ||||
3673 | enum IntrinsicType { VCMPEQ, VCMPGT }; | |||
3674 | // return corresponding comparison intrinsic for given vector type | |||
3675 | static llvm::Intrinsic::ID GetIntrinsic(IntrinsicType IT, | |||
3676 | BuiltinType::Kind ElemKind) { | |||
3677 | switch (ElemKind) { | |||
3678 | default: llvm_unreachable("unexpected element type")::llvm::llvm_unreachable_internal("unexpected element type", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3678); | |||
3679 | case BuiltinType::Char_U: | |||
3680 | case BuiltinType::UChar: | |||
3681 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p : | |||
3682 | llvm::Intrinsic::ppc_altivec_vcmpgtub_p; | |||
3683 | case BuiltinType::Char_S: | |||
3684 | case BuiltinType::SChar: | |||
3685 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p : | |||
3686 | llvm::Intrinsic::ppc_altivec_vcmpgtsb_p; | |||
3687 | case BuiltinType::UShort: | |||
3688 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p : | |||
3689 | llvm::Intrinsic::ppc_altivec_vcmpgtuh_p; | |||
3690 | case BuiltinType::Short: | |||
3691 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p : | |||
3692 | llvm::Intrinsic::ppc_altivec_vcmpgtsh_p; | |||
3693 | case BuiltinType::UInt: | |||
3694 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p : | |||
3695 | llvm::Intrinsic::ppc_altivec_vcmpgtuw_p; | |||
3696 | case BuiltinType::Int: | |||
3697 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p : | |||
3698 | llvm::Intrinsic::ppc_altivec_vcmpgtsw_p; | |||
3699 | case BuiltinType::ULong: | |||
3700 | case BuiltinType::ULongLong: | |||
3701 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequd_p : | |||
3702 | llvm::Intrinsic::ppc_altivec_vcmpgtud_p; | |||
3703 | case BuiltinType::Long: | |||
3704 | case BuiltinType::LongLong: | |||
3705 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequd_p : | |||
3706 | llvm::Intrinsic::ppc_altivec_vcmpgtsd_p; | |||
3707 | case BuiltinType::Float: | |||
3708 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpeqfp_p : | |||
3709 | llvm::Intrinsic::ppc_altivec_vcmpgtfp_p; | |||
3710 | case BuiltinType::Double: | |||
3711 | return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_vsx_xvcmpeqdp_p : | |||
3712 | llvm::Intrinsic::ppc_vsx_xvcmpgtdp_p; | |||
3713 | } | |||
3714 | } | |||
3715 | ||||
3716 | Value *ScalarExprEmitter::EmitCompare(const BinaryOperator *E, | |||
3717 | llvm::CmpInst::Predicate UICmpOpc, | |||
3718 | llvm::CmpInst::Predicate SICmpOpc, | |||
3719 | llvm::CmpInst::Predicate FCmpOpc) { | |||
3720 | TestAndClearIgnoreResultAssign(); | |||
3721 | Value *Result; | |||
3722 | QualType LHSTy = E->getLHS()->getType(); | |||
3723 | QualType RHSTy = E->getRHS()->getType(); | |||
3724 | if (const MemberPointerType *MPT = LHSTy->getAs<MemberPointerType>()) { | |||
3725 | assert(E->getOpcode() == BO_EQ ||((E->getOpcode() == BO_EQ || E->getOpcode() == BO_NE) ? static_cast<void> (0) : __assert_fail ("E->getOpcode() == BO_EQ || E->getOpcode() == BO_NE" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3726, __PRETTY_FUNCTION__)) | |||
3726 | E->getOpcode() == BO_NE)((E->getOpcode() == BO_EQ || E->getOpcode() == BO_NE) ? static_cast<void> (0) : __assert_fail ("E->getOpcode() == BO_EQ || E->getOpcode() == BO_NE" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3726, __PRETTY_FUNCTION__)); | |||
3727 | Value *LHS = CGF.EmitScalarExpr(E->getLHS()); | |||
3728 | Value *RHS = CGF.EmitScalarExpr(E->getRHS()); | |||
3729 | Result = CGF.CGM.getCXXABI().EmitMemberPointerComparison( | |||
3730 | CGF, LHS, RHS, MPT, E->getOpcode() == BO_NE); | |||
3731 | } else if (!LHSTy->isAnyComplexType() && !RHSTy->isAnyComplexType()) { | |||
3732 | BinOpInfo BOInfo = EmitBinOps(E); | |||
3733 | Value *LHS = BOInfo.LHS; | |||
3734 | Value *RHS = BOInfo.RHS; | |||
3735 | ||||
3736 | // If AltiVec, the comparison results in a numeric type, so we use | |||
3737 | // intrinsics comparing vectors and giving 0 or 1 as a result | |||
3738 | if (LHSTy->isVectorType() && !E->getType()->isVectorType()) { | |||
3739 | // constants for mapping CR6 register bits to predicate result | |||
3740 | enum { CR6_EQ=0, CR6_EQ_REV, CR6_LT, CR6_LT_REV } CR6; | |||
3741 | ||||
3742 | llvm::Intrinsic::ID ID = llvm::Intrinsic::not_intrinsic; | |||
3743 | ||||
3744 | // in several cases vector arguments order will be reversed | |||
3745 | Value *FirstVecArg = LHS, | |||
3746 | *SecondVecArg = RHS; | |||
3747 | ||||
3748 | QualType ElTy = LHSTy->castAs<VectorType>()->getElementType(); | |||
3749 | const BuiltinType *BTy = ElTy->getAs<BuiltinType>(); | |||
3750 | BuiltinType::Kind ElementKind = BTy->getKind(); | |||
3751 | ||||
3752 | switch(E->getOpcode()) { | |||
3753 | default: llvm_unreachable("is not a comparison operation")::llvm::llvm_unreachable_internal("is not a comparison operation" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3753); | |||
3754 | case BO_EQ: | |||
3755 | CR6 = CR6_LT; | |||
3756 | ID = GetIntrinsic(VCMPEQ, ElementKind); | |||
3757 | break; | |||
3758 | case BO_NE: | |||
3759 | CR6 = CR6_EQ; | |||
3760 | ID = GetIntrinsic(VCMPEQ, ElementKind); | |||
3761 | break; | |||
3762 | case BO_LT: | |||
3763 | CR6 = CR6_LT; | |||
3764 | ID = GetIntrinsic(VCMPGT, ElementKind); | |||
3765 | std::swap(FirstVecArg, SecondVecArg); | |||
3766 | break; | |||
3767 | case BO_GT: | |||
3768 | CR6 = CR6_LT; | |||
3769 | ID = GetIntrinsic(VCMPGT, ElementKind); | |||
3770 | break; | |||
3771 | case BO_LE: | |||
3772 | if (ElementKind == BuiltinType::Float) { | |||
3773 | CR6 = CR6_LT; | |||
3774 | ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p; | |||
3775 | std::swap(FirstVecArg, SecondVecArg); | |||
3776 | } | |||
3777 | else { | |||
3778 | CR6 = CR6_EQ; | |||
3779 | ID = GetIntrinsic(VCMPGT, ElementKind); | |||
3780 | } | |||
3781 | break; | |||
3782 | case BO_GE: | |||
3783 | if (ElementKind == BuiltinType::Float) { | |||
3784 | CR6 = CR6_LT; | |||
3785 | ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p; | |||
3786 | } | |||
3787 | else { | |||
3788 | CR6 = CR6_EQ; | |||
3789 | ID = GetIntrinsic(VCMPGT, ElementKind); | |||
3790 | std::swap(FirstVecArg, SecondVecArg); | |||
3791 | } | |||
3792 | break; | |||
3793 | } | |||
3794 | ||||
3795 | Value *CR6Param = Builder.getInt32(CR6); | |||
3796 | llvm::Function *F = CGF.CGM.getIntrinsic(ID); | |||
3797 | Result = Builder.CreateCall(F, {CR6Param, FirstVecArg, SecondVecArg}); | |||
3798 | ||||
3799 | // The result type of intrinsic may not be same as E->getType(). | |||
3800 | // If E->getType() is not BoolTy, EmitScalarConversion will do the | |||
3801 | // conversion work. If E->getType() is BoolTy, EmitScalarConversion will | |||
3802 | // do nothing, if ResultTy is not i1 at the same time, it will cause | |||
3803 | // crash later. | |||
3804 | llvm::IntegerType *ResultTy = cast<llvm::IntegerType>(Result->getType()); | |||
3805 | if (ResultTy->getBitWidth() > 1 && | |||
3806 | E->getType() == CGF.getContext().BoolTy) | |||
3807 | Result = Builder.CreateTrunc(Result, Builder.getInt1Ty()); | |||
3808 | return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType(), | |||
3809 | E->getExprLoc()); | |||
3810 | } | |||
3811 | ||||
3812 | if (BOInfo.isFixedPointBinOp()) { | |||
3813 | Result = EmitFixedPointBinOp(BOInfo); | |||
3814 | } else if (LHS->getType()->isFPOrFPVectorTy()) { | |||
3815 | Result = Builder.CreateFCmp(FCmpOpc, LHS, RHS, "cmp"); | |||
3816 | } else if (LHSTy->hasSignedIntegerRepresentation()) { | |||
3817 | Result = Builder.CreateICmp(SICmpOpc, LHS, RHS, "cmp"); | |||
3818 | } else { | |||
3819 | // Unsigned integers and pointers. | |||
3820 | ||||
3821 | if (CGF.CGM.getCodeGenOpts().StrictVTablePointers && | |||
3822 | !isa<llvm::ConstantPointerNull>(LHS) && | |||
3823 | !isa<llvm::ConstantPointerNull>(RHS)) { | |||
3824 | ||||
3825 | // Dynamic information is required to be stripped for comparisons, | |||
3826 | // because it could leak the dynamic information. Based on comparisons | |||
3827 | // of pointers to dynamic objects, the optimizer can replace one pointer | |||
3828 | // with another, which might be incorrect in presence of invariant | |||
3829 | // groups. Comparison with null is safe because null does not carry any | |||
3830 | // dynamic information. | |||
3831 | if (LHSTy.mayBeDynamicClass()) | |||
3832 | LHS = Builder.CreateStripInvariantGroup(LHS); | |||
3833 | if (RHSTy.mayBeDynamicClass()) | |||
3834 | RHS = Builder.CreateStripInvariantGroup(RHS); | |||
3835 | } | |||
3836 | ||||
3837 | Result = Builder.CreateICmp(UICmpOpc, LHS, RHS, "cmp"); | |||
3838 | } | |||
3839 | ||||
3840 | // If this is a vector comparison, sign extend the result to the appropriate | |||
3841 | // vector integer type and return it (don't convert to bool). | |||
3842 | if (LHSTy->isVectorType()) | |||
3843 | return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext"); | |||
3844 | ||||
3845 | } else { | |||
3846 | // Complex Comparison: can only be an equality comparison. | |||
3847 | CodeGenFunction::ComplexPairTy LHS, RHS; | |||
3848 | QualType CETy; | |||
3849 | if (auto *CTy = LHSTy->getAs<ComplexType>()) { | |||
3850 | LHS = CGF.EmitComplexExpr(E->getLHS()); | |||
3851 | CETy = CTy->getElementType(); | |||
3852 | } else { | |||
3853 | LHS.first = Visit(E->getLHS()); | |||
3854 | LHS.second = llvm::Constant::getNullValue(LHS.first->getType()); | |||
3855 | CETy = LHSTy; | |||
3856 | } | |||
3857 | if (auto *CTy = RHSTy->getAs<ComplexType>()) { | |||
3858 | RHS = CGF.EmitComplexExpr(E->getRHS()); | |||
3859 | assert(CGF.getContext().hasSameUnqualifiedType(CETy,((CGF.getContext().hasSameUnqualifiedType(CETy, CTy->getElementType ()) && "The element types must always match.") ? static_cast <void> (0) : __assert_fail ("CGF.getContext().hasSameUnqualifiedType(CETy, CTy->getElementType()) && \"The element types must always match.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3861, __PRETTY_FUNCTION__)) | |||
3860 | CTy->getElementType()) &&((CGF.getContext().hasSameUnqualifiedType(CETy, CTy->getElementType ()) && "The element types must always match.") ? static_cast <void> (0) : __assert_fail ("CGF.getContext().hasSameUnqualifiedType(CETy, CTy->getElementType()) && \"The element types must always match.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3861, __PRETTY_FUNCTION__)) | |||
3861 | "The element types must always match.")((CGF.getContext().hasSameUnqualifiedType(CETy, CTy->getElementType ()) && "The element types must always match.") ? static_cast <void> (0) : __assert_fail ("CGF.getContext().hasSameUnqualifiedType(CETy, CTy->getElementType()) && \"The element types must always match.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3861, __PRETTY_FUNCTION__)); | |||
3862 | (void)CTy; | |||
3863 | } else { | |||
3864 | RHS.first = Visit(E->getRHS()); | |||
3865 | RHS.second = llvm::Constant::getNullValue(RHS.first->getType()); | |||
3866 | assert(CGF.getContext().hasSameUnqualifiedType(CETy, RHSTy) &&((CGF.getContext().hasSameUnqualifiedType(CETy, RHSTy) && "The element types must always match.") ? static_cast<void > (0) : __assert_fail ("CGF.getContext().hasSameUnqualifiedType(CETy, RHSTy) && \"The element types must always match.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3867, __PRETTY_FUNCTION__)) | |||
3867 | "The element types must always match.")((CGF.getContext().hasSameUnqualifiedType(CETy, RHSTy) && "The element types must always match.") ? static_cast<void > (0) : __assert_fail ("CGF.getContext().hasSameUnqualifiedType(CETy, RHSTy) && \"The element types must always match.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3867, __PRETTY_FUNCTION__)); | |||
3868 | } | |||
3869 | ||||
3870 | Value *ResultR, *ResultI; | |||
3871 | if (CETy->isRealFloatingType()) { | |||
3872 | ResultR = Builder.CreateFCmp(FCmpOpc, LHS.first, RHS.first, "cmp.r"); | |||
3873 | ResultI = Builder.CreateFCmp(FCmpOpc, LHS.second, RHS.second, "cmp.i"); | |||
3874 | } else { | |||
3875 | // Complex comparisons can only be equality comparisons. As such, signed | |||
3876 | // and unsigned opcodes are the same. | |||
3877 | ResultR = Builder.CreateICmp(UICmpOpc, LHS.first, RHS.first, "cmp.r"); | |||
3878 | ResultI = Builder.CreateICmp(UICmpOpc, LHS.second, RHS.second, "cmp.i"); | |||
3879 | } | |||
3880 | ||||
3881 | if (E->getOpcode() == BO_EQ) { | |||
3882 | Result = Builder.CreateAnd(ResultR, ResultI, "and.ri"); | |||
3883 | } else { | |||
3884 | assert(E->getOpcode() == BO_NE &&((E->getOpcode() == BO_NE && "Complex comparison other than == or != ?" ) ? static_cast<void> (0) : __assert_fail ("E->getOpcode() == BO_NE && \"Complex comparison other than == or != ?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3885, __PRETTY_FUNCTION__)) | |||
3885 | "Complex comparison other than == or != ?")((E->getOpcode() == BO_NE && "Complex comparison other than == or != ?" ) ? static_cast<void> (0) : __assert_fail ("E->getOpcode() == BO_NE && \"Complex comparison other than == or != ?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 3885, __PRETTY_FUNCTION__)); | |||
3886 | Result = Builder.CreateOr(ResultR, ResultI, "or.ri"); | |||
3887 | } | |||
3888 | } | |||
3889 | ||||
3890 | return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType(), | |||
3891 | E->getExprLoc()); | |||
3892 | } | |||
3893 | ||||
3894 | Value *ScalarExprEmitter::VisitBinAssign(const BinaryOperator *E) { | |||
3895 | bool Ignore = TestAndClearIgnoreResultAssign(); | |||
3896 | ||||
3897 | Value *RHS; | |||
3898 | LValue LHS; | |||
3899 | ||||
3900 | switch (E->getLHS()->getType().getObjCLifetime()) { | |||
3901 | case Qualifiers::OCL_Strong: | |||
3902 | std::tie(LHS, RHS) = CGF.EmitARCStoreStrong(E, Ignore); | |||
3903 | break; | |||
3904 | ||||
3905 | case Qualifiers::OCL_Autoreleasing: | |||
3906 | std::tie(LHS, RHS) = CGF.EmitARCStoreAutoreleasing(E); | |||
3907 | break; | |||
3908 | ||||
3909 | case Qualifiers::OCL_ExplicitNone: | |||
3910 | std::tie(LHS, RHS) = CGF.EmitARCStoreUnsafeUnretained(E, Ignore); | |||
3911 | break; | |||
3912 | ||||
3913 | case Qualifiers::OCL_Weak: | |||
3914 | RHS = Visit(E->getRHS()); | |||
3915 | LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store); | |||
3916 | RHS = CGF.EmitARCStoreWeak(LHS.getAddress(), RHS, Ignore); | |||
3917 | break; | |||
3918 | ||||
3919 | case Qualifiers::OCL_None: | |||
3920 | // __block variables need to have the rhs evaluated first, plus | |||
3921 | // this should improve codegen just a little. | |||
3922 | RHS = Visit(E->getRHS()); | |||
3923 | LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store); | |||
3924 | ||||
3925 | // Store the value into the LHS. Bit-fields are handled specially | |||
3926 | // because the result is altered by the store, i.e., [C99 6.5.16p1] | |||
3927 | // 'An assignment expression has the value of the left operand after | |||
3928 | // the assignment...'. | |||
3929 | if (LHS.isBitField()) { | |||
3930 | CGF.EmitStoreThroughBitfieldLValue(RValue::get(RHS), LHS, &RHS); | |||
3931 | } else { | |||
3932 | CGF.EmitNullabilityCheck(LHS, RHS, E->getExprLoc()); | |||
3933 | CGF.EmitStoreThroughLValue(RValue::get(RHS), LHS); | |||
3934 | } | |||
3935 | } | |||
3936 | ||||
3937 | // If the result is clearly ignored, return now. | |||
3938 | if (Ignore) | |||
3939 | return nullptr; | |||
3940 | ||||
3941 | // The result of an assignment in C is the assigned r-value. | |||
3942 | if (!CGF.getLangOpts().CPlusPlus) | |||
3943 | return RHS; | |||
3944 | ||||
3945 | // If the lvalue is non-volatile, return the computed value of the assignment. | |||
3946 | if (!LHS.isVolatileQualified()) | |||
3947 | return RHS; | |||
3948 | ||||
3949 | // Otherwise, reload the value. | |||
3950 | return EmitLoadOfLValue(LHS, E->getExprLoc()); | |||
3951 | } | |||
3952 | ||||
3953 | Value *ScalarExprEmitter::VisitBinLAnd(const BinaryOperator *E) { | |||
3954 | // Perform vector logical and on comparisons with zero vectors. | |||
3955 | if (E->getType()->isVectorType()) { | |||
3956 | CGF.incrementProfileCounter(E); | |||
3957 | ||||
3958 | Value *LHS = Visit(E->getLHS()); | |||
3959 | Value *RHS = Visit(E->getRHS()); | |||
3960 | Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType()); | |||
3961 | if (LHS->getType()->isFPOrFPVectorTy()) { | |||
3962 | LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp"); | |||
3963 | RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp"); | |||
3964 | } else { | |||
3965 | LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp"); | |||
3966 | RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp"); | |||
3967 | } | |||
3968 | Value *And = Builder.CreateAnd(LHS, RHS); | |||
3969 | return Builder.CreateSExt(And, ConvertType(E->getType()), "sext"); | |||
3970 | } | |||
3971 | ||||
3972 | llvm::Type *ResTy = ConvertType(E->getType()); | |||
3973 | ||||
3974 | // If we have 0 && RHS, see if we can elide RHS, if so, just return 0. | |||
3975 | // If we have 1 && X, just emit X without inserting the control flow. | |||
3976 | bool LHSCondVal; | |||
3977 | if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) { | |||
3978 | if (LHSCondVal) { // If we have 1 && X, just emit X. | |||
3979 | CGF.incrementProfileCounter(E); | |||
3980 | ||||
3981 | Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS()); | |||
3982 | // ZExt result to int or bool. | |||
3983 | return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "land.ext"); | |||
3984 | } | |||
3985 | ||||
3986 | // 0 && RHS: If it is safe, just elide the RHS, and return 0/false. | |||
3987 | if (!CGF.ContainsLabel(E->getRHS())) | |||
3988 | return llvm::Constant::getNullValue(ResTy); | |||
3989 | } | |||
3990 | ||||
3991 | llvm::BasicBlock *ContBlock = CGF.createBasicBlock("land.end"); | |||
3992 | llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("land.rhs"); | |||
3993 | ||||
3994 | CodeGenFunction::ConditionalEvaluation eval(CGF); | |||
3995 | ||||
3996 | // Branch on the LHS first. If it is false, go to the failure (cont) block. | |||
3997 | CGF.EmitBranchOnBoolExpr(E->getLHS(), RHSBlock, ContBlock, | |||
3998 | CGF.getProfileCount(E->getRHS())); | |||
3999 | ||||
4000 | // Any edges into the ContBlock are now from an (indeterminate number of) | |||
4001 | // edges from this first condition. All of these values will be false. Start | |||
4002 | // setting up the PHI node in the Cont Block for this. | |||
4003 | llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2, | |||
4004 | "", ContBlock); | |||
4005 | for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock); | |||
4006 | PI != PE; ++PI) | |||
4007 | PN->addIncoming(llvm::ConstantInt::getFalse(VMContext), *PI); | |||
4008 | ||||
4009 | eval.begin(CGF); | |||
4010 | CGF.EmitBlock(RHSBlock); | |||
4011 | CGF.incrementProfileCounter(E); | |||
4012 | Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS()); | |||
4013 | eval.end(CGF); | |||
4014 | ||||
4015 | // Reaquire the RHS block, as there may be subblocks inserted. | |||
4016 | RHSBlock = Builder.GetInsertBlock(); | |||
4017 | ||||
4018 | // Emit an unconditional branch from this block to ContBlock. | |||
4019 | { | |||
4020 | // There is no need to emit line number for unconditional branch. | |||
4021 | auto NL = ApplyDebugLocation::CreateEmpty(CGF); | |||
4022 | CGF.EmitBlock(ContBlock); | |||
4023 | } | |||
4024 | // Insert an entry into the phi node for the edge with the value of RHSCond. | |||
4025 | PN->addIncoming(RHSCond, RHSBlock); | |||
4026 | ||||
4027 | // Artificial location to preserve the scope information | |||
4028 | { | |||
4029 | auto NL = ApplyDebugLocation::CreateArtificial(CGF); | |||
4030 | PN->setDebugLoc(Builder.getCurrentDebugLocation()); | |||
4031 | } | |||
4032 | ||||
4033 | // ZExt result to int. | |||
4034 | return Builder.CreateZExtOrBitCast(PN, ResTy, "land.ext"); | |||
4035 | } | |||
4036 | ||||
4037 | Value *ScalarExprEmitter::VisitBinLOr(const BinaryOperator *E) { | |||
4038 | // Perform vector logical or on comparisons with zero vectors. | |||
4039 | if (E->getType()->isVectorType()) { | |||
4040 | CGF.incrementProfileCounter(E); | |||
4041 | ||||
4042 | Value *LHS = Visit(E->getLHS()); | |||
4043 | Value *RHS = Visit(E->getRHS()); | |||
4044 | Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType()); | |||
4045 | if (LHS->getType()->isFPOrFPVectorTy()) { | |||
4046 | LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp"); | |||
4047 | RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp"); | |||
4048 | } else { | |||
4049 | LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp"); | |||
4050 | RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp"); | |||
4051 | } | |||
4052 | Value *Or = Builder.CreateOr(LHS, RHS); | |||
4053 | return Builder.CreateSExt(Or, ConvertType(E->getType()), "sext"); | |||
4054 | } | |||
4055 | ||||
4056 | llvm::Type *ResTy = ConvertType(E->getType()); | |||
4057 | ||||
4058 | // If we have 1 || RHS, see if we can elide RHS, if so, just return 1. | |||
4059 | // If we have 0 || X, just emit X without inserting the control flow. | |||
4060 | bool LHSCondVal; | |||
4061 | if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) { | |||
4062 | if (!LHSCondVal) { // If we have 0 || X, just emit X. | |||
4063 | CGF.incrementProfileCounter(E); | |||
4064 | ||||
4065 | Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS()); | |||
4066 | // ZExt result to int or bool. | |||
4067 | return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "lor.ext"); | |||
4068 | } | |||
4069 | ||||
4070 | // 1 || RHS: If it is safe, just elide the RHS, and return 1/true. | |||
4071 | if (!CGF.ContainsLabel(E->getRHS())) | |||
4072 | return llvm::ConstantInt::get(ResTy, 1); | |||
4073 | } | |||
4074 | ||||
4075 | llvm::BasicBlock *ContBlock = CGF.createBasicBlock("lor.end"); | |||
4076 | llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("lor.rhs"); | |||
4077 | ||||
4078 | CodeGenFunction::ConditionalEvaluation eval(CGF); | |||
4079 | ||||
4080 | // Branch on the LHS first. If it is true, go to the success (cont) block. | |||
4081 | CGF.EmitBranchOnBoolExpr(E->getLHS(), ContBlock, RHSBlock, | |||
4082 | CGF.getCurrentProfileCount() - | |||
4083 | CGF.getProfileCount(E->getRHS())); | |||
4084 | ||||
4085 | // Any edges into the ContBlock are now from an (indeterminate number of) | |||
4086 | // edges from this first condition. All of these values will be true. Start | |||
4087 | // setting up the PHI node in the Cont Block for this. | |||
4088 | llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2, | |||
4089 | "", ContBlock); | |||
4090 | for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock); | |||
4091 | PI != PE; ++PI) | |||
4092 | PN->addIncoming(llvm::ConstantInt::getTrue(VMContext), *PI); | |||
4093 | ||||
4094 | eval.begin(CGF); | |||
4095 | ||||
4096 | // Emit the RHS condition as a bool value. | |||
4097 | CGF.EmitBlock(RHSBlock); | |||
4098 | CGF.incrementProfileCounter(E); | |||
4099 | Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS()); | |||
4100 | ||||
4101 | eval.end(CGF); | |||
4102 | ||||
4103 | // Reaquire the RHS block, as there may be subblocks inserted. | |||
4104 | RHSBlock = Builder.GetInsertBlock(); | |||
4105 | ||||
4106 | // Emit an unconditional branch from this block to ContBlock. Insert an entry | |||
4107 | // into the phi node for the edge with the value of RHSCond. | |||
4108 | CGF.EmitBlock(ContBlock); | |||
4109 | PN->addIncoming(RHSCond, RHSBlock); | |||
4110 | ||||
4111 | // ZExt result to int. | |||
4112 | return Builder.CreateZExtOrBitCast(PN, ResTy, "lor.ext"); | |||
4113 | } | |||
4114 | ||||
4115 | Value *ScalarExprEmitter::VisitBinComma(const BinaryOperator *E) { | |||
4116 | CGF.EmitIgnoredExpr(E->getLHS()); | |||
4117 | CGF.EnsureInsertPoint(); | |||
4118 | return Visit(E->getRHS()); | |||
4119 | } | |||
4120 | ||||
4121 | //===----------------------------------------------------------------------===// | |||
4122 | // Other Operators | |||
4123 | //===----------------------------------------------------------------------===// | |||
4124 | ||||
4125 | /// isCheapEnoughToEvaluateUnconditionally - Return true if the specified | |||
4126 | /// expression is cheap enough and side-effect-free enough to evaluate | |||
4127 | /// unconditionally instead of conditionally. This is used to convert control | |||
4128 | /// flow into selects in some cases. | |||
4129 | static bool isCheapEnoughToEvaluateUnconditionally(const Expr *E, | |||
4130 | CodeGenFunction &CGF) { | |||
4131 | // Anything that is an integer or floating point constant is fine. | |||
4132 | return E->IgnoreParens()->isEvaluatable(CGF.getContext()); | |||
4133 | ||||
4134 | // Even non-volatile automatic variables can't be evaluated unconditionally. | |||
4135 | // Referencing a thread_local may cause non-trivial initialization work to | |||
4136 | // occur. If we're inside a lambda and one of the variables is from the scope | |||
4137 | // outside the lambda, that function may have returned already. Reading its | |||
4138 | // locals is a bad idea. Also, these reads may introduce races there didn't | |||
4139 | // exist in the source-level program. | |||
4140 | } | |||
4141 | ||||
4142 | ||||
4143 | Value *ScalarExprEmitter:: | |||
4144 | VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) { | |||
4145 | TestAndClearIgnoreResultAssign(); | |||
4146 | ||||
4147 | // Bind the common expression if necessary. | |||
4148 | CodeGenFunction::OpaqueValueMapping binding(CGF, E); | |||
4149 | ||||
4150 | Expr *condExpr = E->getCond(); | |||
4151 | Expr *lhsExpr = E->getTrueExpr(); | |||
4152 | Expr *rhsExpr = E->getFalseExpr(); | |||
4153 | ||||
4154 | // If the condition constant folds and can be elided, try to avoid emitting | |||
4155 | // the condition and the dead arm. | |||
4156 | bool CondExprBool; | |||
4157 | if (CGF.ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) { | |||
4158 | Expr *live = lhsExpr, *dead = rhsExpr; | |||
4159 | if (!CondExprBool) std::swap(live, dead); | |||
4160 | ||||
4161 | // If the dead side doesn't have labels we need, just emit the Live part. | |||
4162 | if (!CGF.ContainsLabel(dead)) { | |||
4163 | if (CondExprBool) | |||
4164 | CGF.incrementProfileCounter(E); | |||
4165 | Value *Result = Visit(live); | |||
4166 | ||||
4167 | // If the live part is a throw expression, it acts like it has a void | |||
4168 | // type, so evaluating it returns a null Value*. However, a conditional | |||
4169 | // with non-void type must return a non-null Value*. | |||
4170 | if (!Result && !E->getType()->isVoidType()) | |||
4171 | Result = llvm::UndefValue::get(CGF.ConvertType(E->getType())); | |||
4172 | ||||
4173 | return Result; | |||
4174 | } | |||
4175 | } | |||
4176 | ||||
4177 | // OpenCL: If the condition is a vector, we can treat this condition like | |||
4178 | // the select function. | |||
4179 | if (CGF.getLangOpts().OpenCL | |||
4180 | && condExpr->getType()->isVectorType()) { | |||
4181 | CGF.incrementProfileCounter(E); | |||
4182 | ||||
4183 | llvm::Value *CondV = CGF.EmitScalarExpr(condExpr); | |||
4184 | llvm::Value *LHS = Visit(lhsExpr); | |||
4185 | llvm::Value *RHS = Visit(rhsExpr); | |||
4186 | ||||
4187 | llvm::Type *condType = ConvertType(condExpr->getType()); | |||
4188 | llvm::VectorType *vecTy = cast<llvm::VectorType>(condType); | |||
4189 | ||||
4190 | unsigned numElem = vecTy->getNumElements(); | |||
4191 | llvm::Type *elemType = vecTy->getElementType(); | |||
4192 | ||||
4193 | llvm::Value *zeroVec = llvm::Constant::getNullValue(vecTy); | |||
4194 | llvm::Value *TestMSB = Builder.CreateICmpSLT(CondV, zeroVec); | |||
4195 | llvm::Value *tmp = Builder.CreateSExt(TestMSB, | |||
4196 | llvm::VectorType::get(elemType, | |||
4197 | numElem), | |||
4198 | "sext"); | |||
4199 | llvm::Value *tmp2 = Builder.CreateNot(tmp); | |||
4200 | ||||
4201 | // Cast float to int to perform ANDs if necessary. | |||
4202 | llvm::Value *RHSTmp = RHS; | |||
4203 | llvm::Value *LHSTmp = LHS; | |||
4204 | bool wasCast = false; | |||
4205 | llvm::VectorType *rhsVTy = cast<llvm::VectorType>(RHS->getType()); | |||
4206 | if (rhsVTy->getElementType()->isFloatingPointTy()) { | |||
4207 | RHSTmp = Builder.CreateBitCast(RHS, tmp2->getType()); | |||
4208 | LHSTmp = Builder.CreateBitCast(LHS, tmp->getType()); | |||
4209 | wasCast = true; | |||
4210 | } | |||
4211 | ||||
4212 | llvm::Value *tmp3 = Builder.CreateAnd(RHSTmp, tmp2); | |||
4213 | llvm::Value *tmp4 = Builder.CreateAnd(LHSTmp, tmp); | |||
4214 | llvm::Value *tmp5 = Builder.CreateOr(tmp3, tmp4, "cond"); | |||
4215 | if (wasCast) | |||
4216 | tmp5 = Builder.CreateBitCast(tmp5, RHS->getType()); | |||
4217 | ||||
4218 | return tmp5; | |||
4219 | } | |||
4220 | ||||
4221 | // If this is a really simple expression (like x ? 4 : 5), emit this as a | |||
4222 | // select instead of as control flow. We can only do this if it is cheap and | |||
4223 | // safe to evaluate the LHS and RHS unconditionally. | |||
4224 | if (isCheapEnoughToEvaluateUnconditionally(lhsExpr, CGF) && | |||
4225 | isCheapEnoughToEvaluateUnconditionally(rhsExpr, CGF)) { | |||
4226 | llvm::Value *CondV = CGF.EvaluateExprAsBool(condExpr); | |||
4227 | llvm::Value *StepV = Builder.CreateZExtOrBitCast(CondV, CGF.Int64Ty); | |||
4228 | ||||
4229 | CGF.incrementProfileCounter(E, StepV); | |||
4230 | ||||
4231 | llvm::Value *LHS = Visit(lhsExpr); | |||
4232 | llvm::Value *RHS = Visit(rhsExpr); | |||
4233 | if (!LHS) { | |||
4234 | // If the conditional has void type, make sure we return a null Value*. | |||
4235 | assert(!RHS && "LHS and RHS types must match")((!RHS && "LHS and RHS types must match") ? static_cast <void> (0) : __assert_fail ("!RHS && \"LHS and RHS types must match\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4235, __PRETTY_FUNCTION__)); | |||
4236 | return nullptr; | |||
4237 | } | |||
4238 | return Builder.CreateSelect(CondV, LHS, RHS, "cond"); | |||
4239 | } | |||
4240 | ||||
4241 | llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true"); | |||
4242 | llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false"); | |||
4243 | llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end"); | |||
4244 | ||||
4245 | CodeGenFunction::ConditionalEvaluation eval(CGF); | |||
4246 | CGF.EmitBranchOnBoolExpr(condExpr, LHSBlock, RHSBlock, | |||
4247 | CGF.getProfileCount(lhsExpr)); | |||
4248 | ||||
4249 | CGF.EmitBlock(LHSBlock); | |||
4250 | CGF.incrementProfileCounter(E); | |||
4251 | eval.begin(CGF); | |||
4252 | Value *LHS = Visit(lhsExpr); | |||
4253 | eval.end(CGF); | |||
4254 | ||||
4255 | LHSBlock = Builder.GetInsertBlock(); | |||
4256 | Builder.CreateBr(ContBlock); | |||
4257 | ||||
4258 | CGF.EmitBlock(RHSBlock); | |||
4259 | eval.begin(CGF); | |||
4260 | Value *RHS = Visit(rhsExpr); | |||
4261 | eval.end(CGF); | |||
4262 | ||||
4263 | RHSBlock = Builder.GetInsertBlock(); | |||
4264 | CGF.EmitBlock(ContBlock); | |||
4265 | ||||
4266 | // If the LHS or RHS is a throw expression, it will be legitimately null. | |||
4267 | if (!LHS) | |||
4268 | return RHS; | |||
4269 | if (!RHS) | |||
4270 | return LHS; | |||
4271 | ||||
4272 | // Create a PHI node for the real part. | |||
4273 | llvm::PHINode *PN = Builder.CreatePHI(LHS->getType(), 2, "cond"); | |||
4274 | PN->addIncoming(LHS, LHSBlock); | |||
4275 | PN->addIncoming(RHS, RHSBlock); | |||
4276 | return PN; | |||
4277 | } | |||
4278 | ||||
4279 | Value *ScalarExprEmitter::VisitChooseExpr(ChooseExpr *E) { | |||
4280 | return Visit(E->getChosenSubExpr()); | |||
4281 | } | |||
4282 | ||||
4283 | Value *ScalarExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { | |||
4284 | QualType Ty = VE->getType(); | |||
4285 | ||||
4286 | if (Ty->isVariablyModifiedType()) | |||
4287 | CGF.EmitVariablyModifiedType(Ty); | |||
4288 | ||||
4289 | Address ArgValue = Address::invalid(); | |||
4290 | Address ArgPtr = CGF.EmitVAArg(VE, ArgValue); | |||
4291 | ||||
4292 | llvm::Type *ArgTy = ConvertType(VE->getType()); | |||
4293 | ||||
4294 | // If EmitVAArg fails, emit an error. | |||
4295 | if (!ArgPtr.isValid()) { | |||
4296 | CGF.ErrorUnsupported(VE, "va_arg expression"); | |||
4297 | return llvm::UndefValue::get(ArgTy); | |||
4298 | } | |||
4299 | ||||
4300 | // FIXME Volatility. | |||
4301 | llvm::Value *Val = Builder.CreateLoad(ArgPtr); | |||
4302 | ||||
4303 | // If EmitVAArg promoted the type, we must truncate it. | |||
4304 | if (ArgTy != Val->getType()) { | |||
4305 | if (ArgTy->isPointerTy() && !Val->getType()->isPointerTy()) | |||
4306 | Val = Builder.CreateIntToPtr(Val, ArgTy); | |||
4307 | else | |||
4308 | Val = Builder.CreateTrunc(Val, ArgTy); | |||
4309 | } | |||
4310 | ||||
4311 | return Val; | |||
4312 | } | |||
4313 | ||||
4314 | Value *ScalarExprEmitter::VisitBlockExpr(const BlockExpr *block) { | |||
4315 | return CGF.EmitBlockLiteral(block); | |||
4316 | } | |||
4317 | ||||
4318 | // Convert a vec3 to vec4, or vice versa. | |||
4319 | static Value *ConvertVec3AndVec4(CGBuilderTy &Builder, CodeGenFunction &CGF, | |||
4320 | Value *Src, unsigned NumElementsDst) { | |||
4321 | llvm::Value *UnV = llvm::UndefValue::get(Src->getType()); | |||
4322 | SmallVector<llvm::Constant*, 4> Args; | |||
4323 | Args.push_back(Builder.getInt32(0)); | |||
4324 | Args.push_back(Builder.getInt32(1)); | |||
4325 | Args.push_back(Builder.getInt32(2)); | |||
4326 | if (NumElementsDst == 4) | |||
4327 | Args.push_back(llvm::UndefValue::get(CGF.Int32Ty)); | |||
4328 | llvm::Constant *Mask = llvm::ConstantVector::get(Args); | |||
4329 | return Builder.CreateShuffleVector(Src, UnV, Mask); | |||
4330 | } | |||
4331 | ||||
4332 | // Create cast instructions for converting LLVM value \p Src to LLVM type \p | |||
4333 | // DstTy. \p Src has the same size as \p DstTy. Both are single value types | |||
4334 | // but could be scalar or vectors of different lengths, and either can be | |||
4335 | // pointer. | |||
4336 | // There are 4 cases: | |||
4337 | // 1. non-pointer -> non-pointer : needs 1 bitcast | |||
4338 | // 2. pointer -> pointer : needs 1 bitcast or addrspacecast | |||
4339 | // 3. pointer -> non-pointer | |||
4340 | // a) pointer -> intptr_t : needs 1 ptrtoint | |||
4341 | // b) pointer -> non-intptr_t : needs 1 ptrtoint then 1 bitcast | |||
4342 | // 4. non-pointer -> pointer | |||
4343 | // a) intptr_t -> pointer : needs 1 inttoptr | |||
4344 | // b) non-intptr_t -> pointer : needs 1 bitcast then 1 inttoptr | |||
4345 | // Note: for cases 3b and 4b two casts are required since LLVM casts do not | |||
4346 | // allow casting directly between pointer types and non-integer non-pointer | |||
4347 | // types. | |||
4348 | static Value *createCastsForTypeOfSameSize(CGBuilderTy &Builder, | |||
4349 | const llvm::DataLayout &DL, | |||
4350 | Value *Src, llvm::Type *DstTy, | |||
4351 | StringRef Name = "") { | |||
4352 | auto SrcTy = Src->getType(); | |||
4353 | ||||
4354 | // Case 1. | |||
4355 | if (!SrcTy->isPointerTy() && !DstTy->isPointerTy()) | |||
4356 | return Builder.CreateBitCast(Src, DstTy, Name); | |||
4357 | ||||
4358 | // Case 2. | |||
4359 | if (SrcTy->isPointerTy() && DstTy->isPointerTy()) | |||
4360 | return Builder.CreatePointerBitCastOrAddrSpaceCast(Src, DstTy, Name); | |||
4361 | ||||
4362 | // Case 3. | |||
4363 | if (SrcTy->isPointerTy() && !DstTy->isPointerTy()) { | |||
4364 | // Case 3b. | |||
4365 | if (!DstTy->isIntegerTy()) | |||
4366 | Src = Builder.CreatePtrToInt(Src, DL.getIntPtrType(SrcTy)); | |||
4367 | // Cases 3a and 3b. | |||
4368 | return Builder.CreateBitOrPointerCast(Src, DstTy, Name); | |||
4369 | } | |||
4370 | ||||
4371 | // Case 4b. | |||
4372 | if (!SrcTy->isIntegerTy()) | |||
4373 | Src = Builder.CreateBitCast(Src, DL.getIntPtrType(DstTy)); | |||
4374 | // Cases 4a and 4b. | |||
4375 | return Builder.CreateIntToPtr(Src, DstTy, Name); | |||
4376 | } | |||
4377 | ||||
4378 | Value *ScalarExprEmitter::VisitAsTypeExpr(AsTypeExpr *E) { | |||
4379 | Value *Src = CGF.EmitScalarExpr(E->getSrcExpr()); | |||
4380 | llvm::Type *DstTy = ConvertType(E->getType()); | |||
4381 | ||||
4382 | llvm::Type *SrcTy = Src->getType(); | |||
4383 | unsigned NumElementsSrc = isa<llvm::VectorType>(SrcTy) ? | |||
4384 | cast<llvm::VectorType>(SrcTy)->getNumElements() : 0; | |||
4385 | unsigned NumElementsDst = isa<llvm::VectorType>(DstTy) ? | |||
4386 | cast<llvm::VectorType>(DstTy)->getNumElements() : 0; | |||
4387 | ||||
4388 | // Going from vec3 to non-vec3 is a special case and requires a shuffle | |||
4389 | // vector to get a vec4, then a bitcast if the target type is different. | |||
4390 | if (NumElementsSrc == 3 && NumElementsDst != 3) { | |||
4391 | Src = ConvertVec3AndVec4(Builder, CGF, Src, 4); | |||
4392 | ||||
4393 | if (!CGF.CGM.getCodeGenOpts().PreserveVec3Type) { | |||
4394 | Src = createCastsForTypeOfSameSize(Builder, CGF.CGM.getDataLayout(), Src, | |||
4395 | DstTy); | |||
4396 | } | |||
4397 | ||||
4398 | Src->setName("astype"); | |||
4399 | return Src; | |||
4400 | } | |||
4401 | ||||
4402 | // Going from non-vec3 to vec3 is a special case and requires a bitcast | |||
4403 | // to vec4 if the original type is not vec4, then a shuffle vector to | |||
4404 | // get a vec3. | |||
4405 | if (NumElementsSrc != 3 && NumElementsDst == 3) { | |||
4406 | if (!CGF.CGM.getCodeGenOpts().PreserveVec3Type) { | |||
4407 | auto Vec4Ty = llvm::VectorType::get(DstTy->getVectorElementType(), 4); | |||
4408 | Src = createCastsForTypeOfSameSize(Builder, CGF.CGM.getDataLayout(), Src, | |||
4409 | Vec4Ty); | |||
4410 | } | |||
4411 | ||||
4412 | Src = ConvertVec3AndVec4(Builder, CGF, Src, 3); | |||
4413 | Src->setName("astype"); | |||
4414 | return Src; | |||
4415 | } | |||
4416 | ||||
4417 | return Src = createCastsForTypeOfSameSize(Builder, CGF.CGM.getDataLayout(), | |||
4418 | Src, DstTy, "astype"); | |||
4419 | } | |||
4420 | ||||
4421 | Value *ScalarExprEmitter::VisitAtomicExpr(AtomicExpr *E) { | |||
4422 | return CGF.EmitAtomicExpr(E).getScalarVal(); | |||
4423 | } | |||
4424 | ||||
4425 | //===----------------------------------------------------------------------===// | |||
4426 | // Entry Point into this File | |||
4427 | //===----------------------------------------------------------------------===// | |||
4428 | ||||
4429 | /// Emit the computation of the specified expression of scalar type, ignoring | |||
4430 | /// the result. | |||
4431 | Value *CodeGenFunction::EmitScalarExpr(const Expr *E, bool IgnoreResultAssign) { | |||
4432 | assert(E && hasScalarEvaluationKind(E->getType()) &&((E && hasScalarEvaluationKind(E->getType()) && "Invalid scalar expression to emit") ? static_cast<void> (0) : __assert_fail ("E && hasScalarEvaluationKind(E->getType()) && \"Invalid scalar expression to emit\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4433, __PRETTY_FUNCTION__)) | |||
4433 | "Invalid scalar expression to emit")((E && hasScalarEvaluationKind(E->getType()) && "Invalid scalar expression to emit") ? static_cast<void> (0) : __assert_fail ("E && hasScalarEvaluationKind(E->getType()) && \"Invalid scalar expression to emit\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4433, __PRETTY_FUNCTION__)); | |||
4434 | ||||
4435 | return ScalarExprEmitter(*this, IgnoreResultAssign) | |||
4436 | .Visit(const_cast<Expr *>(E)); | |||
4437 | } | |||
4438 | ||||
4439 | /// Emit a conversion from the specified type to the specified destination type, | |||
4440 | /// both of which are LLVM scalar types. | |||
4441 | Value *CodeGenFunction::EmitScalarConversion(Value *Src, QualType SrcTy, | |||
4442 | QualType DstTy, | |||
4443 | SourceLocation Loc) { | |||
4444 | assert(hasScalarEvaluationKind(SrcTy) && hasScalarEvaluationKind(DstTy) &&((hasScalarEvaluationKind(SrcTy) && hasScalarEvaluationKind (DstTy) && "Invalid scalar expression to emit") ? static_cast <void> (0) : __assert_fail ("hasScalarEvaluationKind(SrcTy) && hasScalarEvaluationKind(DstTy) && \"Invalid scalar expression to emit\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4445, __PRETTY_FUNCTION__)) | |||
4445 | "Invalid scalar expression to emit")((hasScalarEvaluationKind(SrcTy) && hasScalarEvaluationKind (DstTy) && "Invalid scalar expression to emit") ? static_cast <void> (0) : __assert_fail ("hasScalarEvaluationKind(SrcTy) && hasScalarEvaluationKind(DstTy) && \"Invalid scalar expression to emit\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4445, __PRETTY_FUNCTION__)); | |||
4446 | return ScalarExprEmitter(*this).EmitScalarConversion(Src, SrcTy, DstTy, Loc); | |||
4447 | } | |||
4448 | ||||
4449 | /// Emit a conversion from the specified complex type to the specified | |||
4450 | /// destination type, where the destination type is an LLVM scalar type. | |||
4451 | Value *CodeGenFunction::EmitComplexToScalarConversion(ComplexPairTy Src, | |||
4452 | QualType SrcTy, | |||
4453 | QualType DstTy, | |||
4454 | SourceLocation Loc) { | |||
4455 | assert(SrcTy->isAnyComplexType() && hasScalarEvaluationKind(DstTy) &&((SrcTy->isAnyComplexType() && hasScalarEvaluationKind (DstTy) && "Invalid complex -> scalar conversion") ? static_cast<void> (0) : __assert_fail ("SrcTy->isAnyComplexType() && hasScalarEvaluationKind(DstTy) && \"Invalid complex -> scalar conversion\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4456, __PRETTY_FUNCTION__)) | |||
4456 | "Invalid complex -> scalar conversion")((SrcTy->isAnyComplexType() && hasScalarEvaluationKind (DstTy) && "Invalid complex -> scalar conversion") ? static_cast<void> (0) : __assert_fail ("SrcTy->isAnyComplexType() && hasScalarEvaluationKind(DstTy) && \"Invalid complex -> scalar conversion\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4456, __PRETTY_FUNCTION__)); | |||
4457 | return ScalarExprEmitter(*this) | |||
4458 | .EmitComplexToScalarConversion(Src, SrcTy, DstTy, Loc); | |||
4459 | } | |||
4460 | ||||
4461 | ||||
4462 | llvm::Value *CodeGenFunction:: | |||
4463 | EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV, | |||
4464 | bool isInc, bool isPre) { | |||
4465 | return ScalarExprEmitter(*this).EmitScalarPrePostIncDec(E, LV, isInc, isPre); | |||
4466 | } | |||
4467 | ||||
4468 | LValue CodeGenFunction::EmitObjCIsaExpr(const ObjCIsaExpr *E) { | |||
4469 | // object->isa or (*object).isa | |||
4470 | // Generate code as for: *(Class*)object | |||
4471 | ||||
4472 | Expr *BaseExpr = E->getBase(); | |||
4473 | Address Addr = Address::invalid(); | |||
4474 | if (BaseExpr->isRValue()) { | |||
4475 | Addr = Address(EmitScalarExpr(BaseExpr), getPointerAlign()); | |||
4476 | } else { | |||
4477 | Addr = EmitLValue(BaseExpr).getAddress(); | |||
4478 | } | |||
4479 | ||||
4480 | // Cast the address to Class*. | |||
4481 | Addr = Builder.CreateElementBitCast(Addr, ConvertType(E->getType())); | |||
4482 | return MakeAddrLValue(Addr, E->getType()); | |||
4483 | } | |||
4484 | ||||
4485 | ||||
4486 | LValue CodeGenFunction::EmitCompoundAssignmentLValue( | |||
4487 | const CompoundAssignOperator *E) { | |||
4488 | ScalarExprEmitter Scalar(*this); | |||
4489 | Value *Result = nullptr; | |||
4490 | switch (E->getOpcode()) { | |||
4491 | #define COMPOUND_OP(Op) \ | |||
4492 | case BO_##Op##Assign: \ | |||
4493 | return Scalar.EmitCompoundAssignLValue(E, &ScalarExprEmitter::Emit##Op, \ | |||
4494 | Result) | |||
4495 | COMPOUND_OP(Mul); | |||
4496 | COMPOUND_OP(Div); | |||
4497 | COMPOUND_OP(Rem); | |||
4498 | COMPOUND_OP(Add); | |||
4499 | COMPOUND_OP(Sub); | |||
4500 | COMPOUND_OP(Shl); | |||
4501 | COMPOUND_OP(Shr); | |||
4502 | COMPOUND_OP(And); | |||
4503 | COMPOUND_OP(Xor); | |||
4504 | COMPOUND_OP(Or); | |||
4505 | #undef COMPOUND_OP | |||
4506 | ||||
4507 | case BO_PtrMemD: | |||
4508 | case BO_PtrMemI: | |||
4509 | case BO_Mul: | |||
4510 | case BO_Div: | |||
4511 | case BO_Rem: | |||
4512 | case BO_Add: | |||
4513 | case BO_Sub: | |||
4514 | case BO_Shl: | |||
4515 | case BO_Shr: | |||
4516 | case BO_LT: | |||
4517 | case BO_GT: | |||
4518 | case BO_LE: | |||
4519 | case BO_GE: | |||
4520 | case BO_EQ: | |||
4521 | case BO_NE: | |||
4522 | case BO_Cmp: | |||
4523 | case BO_And: | |||
4524 | case BO_Xor: | |||
4525 | case BO_Or: | |||
4526 | case BO_LAnd: | |||
4527 | case BO_LOr: | |||
4528 | case BO_Assign: | |||
4529 | case BO_Comma: | |||
4530 | llvm_unreachable("Not valid compound assignment operators")::llvm::llvm_unreachable_internal("Not valid compound assignment operators" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4530); | |||
4531 | } | |||
4532 | ||||
4533 | llvm_unreachable("Unhandled compound assignment operator")::llvm::llvm_unreachable_internal("Unhandled compound assignment operator" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4533); | |||
4534 | } | |||
4535 | ||||
4536 | struct GEPOffsetAndOverflow { | |||
4537 | // The total (signed) byte offset for the GEP. | |||
4538 | llvm::Value *TotalOffset; | |||
4539 | // The offset overflow flag - true if the total offset overflows. | |||
4540 | llvm::Value *OffsetOverflows; | |||
4541 | }; | |||
4542 | ||||
4543 | /// Evaluate given GEPVal, which must be an inbounds GEP, | |||
4544 | /// and compute the total offset it applies from it's base pointer BasePtr. | |||
4545 | /// Returns offset in bytes and a boolean flag whether an overflow happened | |||
4546 | /// during evaluation. | |||
4547 | static GEPOffsetAndOverflow EmitGEPOffsetInBytes(Value *BasePtr, Value *GEPVal, | |||
4548 | llvm::LLVMContext &VMContext, | |||
4549 | CodeGenModule &CGM, | |||
4550 | CGBuilderTy Builder) { | |||
4551 | auto *GEP = cast<llvm::GEPOperator>(GEPVal); | |||
4552 | assert(GEP->isInBounds() && "Expected inbounds GEP")((GEP->isInBounds() && "Expected inbounds GEP") ? static_cast <void> (0) : __assert_fail ("GEP->isInBounds() && \"Expected inbounds GEP\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4552, __PRETTY_FUNCTION__)); | |||
4553 | ||||
4554 | const auto &DL = CGM.getDataLayout(); | |||
4555 | auto *IntPtrTy = DL.getIntPtrType(GEP->getPointerOperandType()); | |||
4556 | ||||
4557 | // Grab references to the signed add/mul overflow intrinsics for intptr_t. | |||
4558 | auto *Zero = llvm::ConstantInt::getNullValue(IntPtrTy); | |||
4559 | auto *SAddIntrinsic = | |||
4560 | CGM.getIntrinsic(llvm::Intrinsic::sadd_with_overflow, IntPtrTy); | |||
4561 | auto *SMulIntrinsic = | |||
4562 | CGM.getIntrinsic(llvm::Intrinsic::smul_with_overflow, IntPtrTy); | |||
4563 | ||||
4564 | // The total (signed) byte offset for the GEP. | |||
4565 | llvm::Value *TotalOffset = nullptr; | |||
4566 | // The offset overflow flag - true if the total offset overflows. | |||
4567 | llvm::Value *OffsetOverflows = Builder.getFalse(); | |||
4568 | ||||
4569 | /// Return the result of the given binary operation. | |||
4570 | auto eval = [&](BinaryOperator::Opcode Opcode, llvm::Value *LHS, | |||
4571 | llvm::Value *RHS) -> llvm::Value * { | |||
4572 | assert((Opcode == BO_Add || Opcode == BO_Mul) && "Can't eval binop")(((Opcode == BO_Add || Opcode == BO_Mul) && "Can't eval binop" ) ? static_cast<void> (0) : __assert_fail ("(Opcode == BO_Add || Opcode == BO_Mul) && \"Can't eval binop\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4572, __PRETTY_FUNCTION__)); | |||
4573 | ||||
4574 | // If the operands are constants, return a constant result. | |||
4575 | if (auto *LHSCI = dyn_cast<llvm::ConstantInt>(LHS)) { | |||
4576 | if (auto *RHSCI = dyn_cast<llvm::ConstantInt>(RHS)) { | |||
4577 | llvm::APInt N; | |||
4578 | bool HasOverflow = mayHaveIntegerOverflow(LHSCI, RHSCI, Opcode, | |||
4579 | /*Signed=*/true, N); | |||
4580 | if (HasOverflow) | |||
4581 | OffsetOverflows = Builder.getTrue(); | |||
4582 | return llvm::ConstantInt::get(VMContext, N); | |||
4583 | } | |||
4584 | } | |||
4585 | ||||
4586 | // Otherwise, compute the result with checked arithmetic. | |||
4587 | auto *ResultAndOverflow = Builder.CreateCall( | |||
4588 | (Opcode == BO_Add) ? SAddIntrinsic : SMulIntrinsic, {LHS, RHS}); | |||
4589 | OffsetOverflows = Builder.CreateOr( | |||
4590 | Builder.CreateExtractValue(ResultAndOverflow, 1), OffsetOverflows); | |||
4591 | return Builder.CreateExtractValue(ResultAndOverflow, 0); | |||
4592 | }; | |||
4593 | ||||
4594 | // Determine the total byte offset by looking at each GEP operand. | |||
4595 | for (auto GTI = llvm::gep_type_begin(GEP), GTE = llvm::gep_type_end(GEP); | |||
4596 | GTI != GTE; ++GTI) { | |||
4597 | llvm::Value *LocalOffset; | |||
4598 | auto *Index = GTI.getOperand(); | |||
4599 | // Compute the local offset contributed by this indexing step: | |||
4600 | if (auto *STy = GTI.getStructTypeOrNull()) { | |||
4601 | // For struct indexing, the local offset is the byte position of the | |||
4602 | // specified field. | |||
4603 | unsigned FieldNo = cast<llvm::ConstantInt>(Index)->getZExtValue(); | |||
4604 | LocalOffset = llvm::ConstantInt::get( | |||
4605 | IntPtrTy, DL.getStructLayout(STy)->getElementOffset(FieldNo)); | |||
4606 | } else { | |||
4607 | // Otherwise this is array-like indexing. The local offset is the index | |||
4608 | // multiplied by the element size. | |||
4609 | auto *ElementSize = llvm::ConstantInt::get( | |||
4610 | IntPtrTy, DL.getTypeAllocSize(GTI.getIndexedType())); | |||
4611 | auto *IndexS = Builder.CreateIntCast(Index, IntPtrTy, /*isSigned=*/true); | |||
4612 | LocalOffset = eval(BO_Mul, ElementSize, IndexS); | |||
4613 | } | |||
4614 | ||||
4615 | // If this is the first offset, set it as the total offset. Otherwise, add | |||
4616 | // the local offset into the running total. | |||
4617 | if (!TotalOffset || TotalOffset == Zero) | |||
4618 | TotalOffset = LocalOffset; | |||
4619 | else | |||
4620 | TotalOffset = eval(BO_Add, TotalOffset, LocalOffset); | |||
4621 | } | |||
4622 | ||||
4623 | return {TotalOffset, OffsetOverflows}; | |||
4624 | } | |||
4625 | ||||
4626 | Value * | |||
4627 | CodeGenFunction::EmitCheckedInBoundsGEP(Value *Ptr, ArrayRef<Value *> IdxList, | |||
4628 | bool SignedIndices, bool IsSubtraction, | |||
4629 | SourceLocation Loc, const Twine &Name) { | |||
4630 | Value *GEPVal = Builder.CreateInBoundsGEP(Ptr, IdxList, Name); | |||
4631 | ||||
4632 | // If the pointer overflow sanitizer isn't enabled, do nothing. | |||
4633 | if (!SanOpts.has(SanitizerKind::PointerOverflow)) | |||
4634 | return GEPVal; | |||
4635 | ||||
4636 | // If the GEP has already been reduced to a constant, leave it be. | |||
4637 | if (isa<llvm::Constant>(GEPVal)) | |||
4638 | return GEPVal; | |||
4639 | ||||
4640 | // Only check for overflows in the default address space. | |||
4641 | if (GEPVal->getType()->getPointerAddressSpace()) | |||
4642 | return GEPVal; | |||
4643 | ||||
4644 | SanitizerScope SanScope(this); | |||
4645 | ||||
4646 | GEPOffsetAndOverflow EvaluatedGEP = | |||
4647 | EmitGEPOffsetInBytes(Ptr, GEPVal, getLLVMContext(), CGM, Builder); | |||
4648 | ||||
4649 | auto *GEP = cast<llvm::GEPOperator>(GEPVal); | |||
4650 | ||||
4651 | const auto &DL = CGM.getDataLayout(); | |||
4652 | auto *IntPtrTy = DL.getIntPtrType(GEP->getPointerOperandType()); | |||
4653 | ||||
4654 | auto *Zero = llvm::ConstantInt::getNullValue(IntPtrTy); | |||
4655 | ||||
4656 | // Common case: if the total offset is zero, don't emit a check. | |||
4657 | if (EvaluatedGEP.TotalOffset == Zero) | |||
4658 | return GEPVal; | |||
4659 | ||||
4660 | // Now that we've computed the total offset, add it to the base pointer (with | |||
4661 | // wrapping semantics). | |||
4662 | auto *IntPtr = Builder.CreatePtrToInt(GEP->getPointerOperand(), IntPtrTy); | |||
4663 | auto *ComputedGEP = Builder.CreateAdd(IntPtr, EvaluatedGEP.TotalOffset); | |||
4664 | ||||
4665 | llvm::SmallVector<std::pair<llvm::Value *, SanitizerMask>, 1> Checks; | |||
4666 | ||||
4667 | // The GEP is valid if: | |||
4668 | // 1) The total offset doesn't overflow, and | |||
4669 | // 2) The sign of the difference between the computed address and the base | |||
4670 | // pointer matches the sign of the total offset. | |||
4671 | llvm::Value *ValidGEP; | |||
4672 | auto *NoOffsetOverflow = Builder.CreateNot(EvaluatedGEP.OffsetOverflows); | |||
4673 | if (SignedIndices) { | |||
4674 | // GEP is computed as `unsigned base + signed offset`, therefore: | |||
4675 | // * If offset was positive, then the computed pointer can not be | |||
4676 | // [unsigned] less than the base pointer, unless it overflowed. | |||
4677 | // * If offset was negative, then the computed pointer can not be | |||
4678 | // [unsigned] greater than the bas pointere, unless it overflowed. | |||
4679 | auto *PosOrZeroValid = Builder.CreateICmpUGE(ComputedGEP, IntPtr); | |||
4680 | auto *PosOrZeroOffset = | |||
4681 | Builder.CreateICmpSGE(EvaluatedGEP.TotalOffset, Zero); | |||
4682 | llvm::Value *NegValid = Builder.CreateICmpULT(ComputedGEP, IntPtr); | |||
4683 | ValidGEP = Builder.CreateSelect(PosOrZeroOffset, PosOrZeroValid, NegValid); | |||
4684 | } else if (!IsSubtraction) { | |||
4685 | // GEP is computed as `unsigned base + unsigned offset`, therefore the | |||
4686 | // computed pointer can not be [unsigned] less than base pointer, | |||
4687 | // unless there was an overflow. | |||
4688 | // Equivalent to `@llvm.uadd.with.overflow(%base, %offset)`. | |||
4689 | ValidGEP = Builder.CreateICmpUGE(ComputedGEP, IntPtr); | |||
4690 | } else { | |||
4691 | // GEP is computed as `unsigned base - unsigned offset`, therefore the | |||
4692 | // computed pointer can not be [unsigned] greater than base pointer, | |||
4693 | // unless there was an overflow. | |||
4694 | // Equivalent to `@llvm.usub.with.overflow(%base, sub(0, %offset))`. | |||
4695 | ValidGEP = Builder.CreateICmpULE(ComputedGEP, IntPtr); | |||
4696 | } | |||
4697 | ValidGEP = Builder.CreateAnd(ValidGEP, NoOffsetOverflow); | |||
4698 | Checks.emplace_back(ValidGEP, SanitizerKind::PointerOverflow); | |||
4699 | ||||
4700 | assert(!Checks.empty() && "Should have produced some checks.")((!Checks.empty() && "Should have produced some checks." ) ? static_cast<void> (0) : __assert_fail ("!Checks.empty() && \"Should have produced some checks.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/CodeGen/CGExprScalar.cpp" , 4700, __PRETTY_FUNCTION__)); | |||
4701 | ||||
4702 | llvm::Constant *StaticArgs[] = {EmitCheckSourceLocation(Loc)}; | |||
4703 | // Pass the computed GEP to the runtime to avoid emitting poisoned arguments. | |||
4704 | llvm::Value *DynamicArgs[] = {IntPtr, ComputedGEP}; | |||
4705 | EmitCheck(Checks, SanitizerHandler::PointerOverflow, StaticArgs, DynamicArgs); | |||
4706 | ||||
4707 | return GEPVal; | |||
4708 | } |