1 //===--- CGExprConstant.cpp - Emit LLVM Code from Constant Expressions ----===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This contains code to emit Constant Expr nodes as LLVM code.
12 //===----------------------------------------------------------------------===//
14 #include "CodeGenFunction.h"
15 #include "CodeGenModule.h"
16 #include "clang/AST/AST.h"
17 #include "llvm/Constants.h"
18 #include "llvm/Function.h"
19 #include "llvm/GlobalVariable.h"
20 #include "llvm/Support/Compiler.h"
21 using namespace clang;
22 using namespace CodeGen;
25 class VISIBILITY_HIDDEN ConstExprEmitter :
26 public StmtVisitor<ConstExprEmitter, llvm::Constant*> {
29 ConstExprEmitter(CodeGenModule &cgm)
33 //===--------------------------------------------------------------------===//
35 //===--------------------------------------------------------------------===//
37 llvm::Constant *VisitStmt(Stmt *S) {
38 CGM.WarnUnsupported(S, "constant expression");
42 llvm::Constant *VisitParenExpr(ParenExpr *PE) {
43 return Visit(PE->getSubExpr());
47 llvm::Constant *VisitIntegerLiteral(const IntegerLiteral *E) {
48 return llvm::ConstantInt::get(E->getValue());
50 llvm::Constant *VisitFloatingLiteral(const FloatingLiteral *E) {
51 return llvm::ConstantFP::get(ConvertType(E->getType()), E->getValue());
53 llvm::Constant *VisitCharacterLiteral(const CharacterLiteral *E) {
54 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
56 llvm::Constant *VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) {
57 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
60 llvm::Constant *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
61 return Visit(E->getInitializer());
64 llvm::Constant *VisitCastExpr(const CastExpr* E) {
65 llvm::Constant *C = Visit(E->getSubExpr());
67 return EmitConversion(C, E->getSubExpr()->getType(), E->getType());
70 llvm::Constant *EmitArrayInitialization(InitListExpr *ILE,
71 const llvm::ArrayType *AType) {
73 std::vector<llvm::Constant*> Elts;
74 unsigned NumInitElements = ILE->getNumInits();
75 const llvm::Type *ElemTy = AType->getElementType();
76 unsigned NumElements = AType->getNumElements();
78 // Initialising an array requires us to automatically
79 // initialise any elements that have not been initialised explicitly
80 unsigned NumInitableElts = std::min(NumInitElements, NumElements);
82 // Copy initializer elements.
84 for (; i < NumInitableElts; ++i) {
86 llvm::Constant *C = Visit(ILE->getInit(i));
87 // FIXME: Remove this when sema of initializers is finished (and the code
89 if (C == 0 && ILE->getInit(i)->getType()->isVoidType()) {
90 if (ILE->getType()->isVoidType()) return 0;
91 return llvm::UndefValue::get(AType);
93 assert (C && "Failed to create initializer expression");
97 // Initialize remaining array elements.
98 for (; i < NumElements; ++i)
99 Elts.push_back(llvm::Constant::getNullValue(ElemTy));
101 return llvm::ConstantArray::get(AType, Elts);
104 llvm::Constant *EmitStructInitialization(InitListExpr *ILE,
105 const llvm::StructType *SType) {
107 TagDecl *TD = ILE->getType()->getAsRecordType()->getDecl();
108 std::vector<llvm::Constant*> Elts;
109 const CGRecordLayout *CGR = CGM.getTypes().getCGRecordLayout(TD);
110 unsigned NumInitElements = ILE->getNumInits();
111 unsigned NumElements = SType->getNumElements();
113 // Initialising an structure requires us to automatically
114 // initialise any elements that have not been initialised explicitly
115 unsigned NumInitableElts = std::min(NumInitElements, NumElements);
117 // Copy initializer elements. Skip padding fields.
118 unsigned EltNo = 0; // Element no in ILE
119 unsigned FieldNo = 0; // Field no in SType
120 while (EltNo < NumInitableElts) {
122 // Zero initialize padding field.
123 if (CGR->isPaddingField(FieldNo)) {
124 const llvm::Type *FieldTy = SType->getElementType(FieldNo);
125 Elts.push_back(llvm::Constant::getNullValue(FieldTy));
130 llvm::Constant *C = Visit(ILE->getInit(EltNo));
131 // FIXME: Remove this when sema of initializers is finished (and the code
133 if (C == 0 && ILE->getInit(EltNo)->getType()->isVoidType()) {
134 if (ILE->getType()->isVoidType()) return 0;
135 return llvm::UndefValue::get(SType);
137 assert (C && "Failed to create initializer expression");
143 // Initialize remaining structure elements.
144 for (unsigned i = Elts.size(); i < NumElements; ++i) {
145 const llvm::Type *FieldTy = SType->getElementType(i);
146 Elts.push_back(llvm::Constant::getNullValue(FieldTy));
149 return llvm::ConstantStruct::get(SType, Elts);
152 llvm::Constant *EmitVectorInitialization(InitListExpr *ILE,
153 const llvm::VectorType *VType) {
155 std::vector<llvm::Constant*> Elts;
156 unsigned NumInitElements = ILE->getNumInits();
157 unsigned NumElements = VType->getNumElements();
159 assert (NumInitElements == NumElements
160 && "Unsufficient vector init elelments");
161 // Copy initializer elements.
163 for (; i < NumElements; ++i) {
165 llvm::Constant *C = Visit(ILE->getInit(i));
166 // FIXME: Remove this when sema of initializers is finished (and the code
168 if (C == 0 && ILE->getInit(i)->getType()->isVoidType()) {
169 if (ILE->getType()->isVoidType()) return 0;
170 return llvm::UndefValue::get(VType);
172 assert (C && "Failed to create initializer expression");
176 return llvm::ConstantVector::get(VType, Elts);
179 llvm::Constant *VisitInitListExpr(InitListExpr *ILE) {
180 const llvm::CompositeType *CType =
181 dyn_cast<llvm::CompositeType>(ConvertType(ILE->getType()));
184 // We have a scalar in braces. Just use the first element.
185 return Visit(ILE->getInit(0));
188 if (const llvm::ArrayType *AType = dyn_cast<llvm::ArrayType>(CType))
189 return EmitArrayInitialization(ILE, AType);
191 if (const llvm::StructType *SType = dyn_cast<llvm::StructType>(CType))
192 return EmitStructInitialization(ILE, SType);
194 if (const llvm::VectorType *VType = dyn_cast<llvm::VectorType>(CType))
195 return EmitVectorInitialization(ILE, VType);
197 // Make sure we have an array at this point
198 assert(0 && "Unable to handle InitListExpr");
201 llvm::Constant *VisitImplicitCastExpr(ImplicitCastExpr *ICExpr) {
202 // If this is due to array->pointer conversion, emit the array expression as
204 if (ICExpr->getSubExpr()->getType()->isArrayType()) {
205 // Note that VLAs can't exist for global variables.
206 // The only thing that can have array type like this is a
207 // DeclRefExpr(FileVarDecl)?
208 llvm::Constant *C = EmitLValue(ICExpr->getSubExpr());
209 assert(isa<llvm::PointerType>(C->getType()) &&
210 isa<llvm::ArrayType>(cast<llvm::PointerType>(C->getType())
211 ->getElementType()));
212 llvm::Constant *Idx0 = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0);
214 llvm::Constant *Ops[] = {Idx0, Idx0};
215 C = llvm::ConstantExpr::getGetElementPtr(C, Ops, 2);
217 // The resultant pointer type can be implicitly cast to other pointer
218 // types as well, for example void*.
219 const llvm::Type *DestPTy = ConvertType(ICExpr->getType());
220 assert(isa<llvm::PointerType>(DestPTy) &&
221 "Only expect implicit cast to pointer");
222 return llvm::ConstantExpr::getBitCast(C, DestPTy);
225 llvm::Constant *C = Visit(ICExpr->getSubExpr());
227 return EmitConversion(C, ICExpr->getSubExpr()->getType(),ICExpr->getType());
230 llvm::Constant *VisitStringLiteral(StringLiteral *E) {
231 const char *StrData = E->getStrData();
232 unsigned Len = E->getByteLength();
233 assert(!E->getType()->isPointerType() && "Strings are always arrays");
235 // Otherwise this must be a string initializing an array in a static
236 // initializer. Don't emit it as the address of the string, emit the string
237 // data itself as an inline array.
238 const ConstantArrayType *CAT = E->getType()->getAsConstantArrayType();
239 assert(CAT && "String isn't pointer or array!");
241 std::string Str(StrData, StrData + Len);
242 // Null terminate the string before potentially truncating it.
243 // FIXME: What about wchar_t strings?
246 uint64_t RealLen = CAT->getSize().getZExtValue();
247 // String or grow the initializer to the required size.
248 if (RealLen != Str.size())
251 return llvm::ConstantArray::get(Str, false);
254 llvm::Constant *VisitDeclRefExpr(DeclRefExpr *E) {
255 const ValueDecl *Decl = E->getDecl();
256 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Decl))
257 return CGM.GetAddrOfFunctionDecl(FD, false);
258 if (const EnumConstantDecl *EC = dyn_cast<EnumConstantDecl>(Decl))
259 return llvm::ConstantInt::get(EC->getInitVal());
260 assert(0 && "Unsupported decl ref type!");
264 llvm::Constant *VisitSizeOfAlignOfTypeExpr(const SizeOfAlignOfTypeExpr *E) {
265 return EmitSizeAlignOf(E->getArgumentType(), E->getType(), E->isSizeOf());
269 llvm::Constant *VisitUnaryPlus(const UnaryOperator *E) {
270 return Visit(E->getSubExpr());
272 llvm::Constant *VisitUnaryMinus(const UnaryOperator *E) {
273 return llvm::ConstantExpr::getNeg(Visit(E->getSubExpr()));
275 llvm::Constant *VisitUnaryNot(const UnaryOperator *E) {
276 return llvm::ConstantExpr::getNot(Visit(E->getSubExpr()));
278 llvm::Constant *VisitUnaryLNot(const UnaryOperator *E) {
279 llvm::Constant *SubExpr = Visit(E->getSubExpr());
281 if (E->getSubExpr()->getType()->isRealFloatingType()) {
282 // Compare against 0.0 for fp scalars.
283 llvm::Constant *Zero = llvm::Constant::getNullValue(SubExpr->getType());
284 SubExpr = llvm::ConstantExpr::getFCmp(llvm::FCmpInst::FCMP_UEQ, SubExpr,
287 assert((E->getSubExpr()->getType()->isIntegerType() ||
288 E->getSubExpr()->getType()->isPointerType()) &&
289 "Unknown scalar type to convert");
290 // Compare against an integer or pointer null.
291 llvm::Constant *Zero = llvm::Constant::getNullValue(SubExpr->getType());
292 SubExpr = llvm::ConstantExpr::getICmp(llvm::ICmpInst::ICMP_EQ, SubExpr,
296 return llvm::ConstantExpr::getZExt(SubExpr, ConvertType(E->getType()));
298 llvm::Constant *VisitUnarySizeOf(const UnaryOperator *E) {
299 return EmitSizeAlignOf(E->getSubExpr()->getType(), E->getType(), true);
301 llvm::Constant *VisitUnaryAlignOf(const UnaryOperator *E) {
302 return EmitSizeAlignOf(E->getSubExpr()->getType(), E->getType(), false);
304 llvm::Constant *VisitUnaryAddrOf(const UnaryOperator *E) {
305 return EmitLValue(E->getSubExpr());
307 llvm::Constant *VisitUnaryOffsetOf(const UnaryOperator *E) {
308 int64_t Val = E->evaluateOffsetOf(CGM.getContext());
310 assert(E->getType()->isIntegerType() && "Result type must be an integer!");
312 uint32_t ResultWidth = static_cast<uint32_t>(
313 CGM.getContext().getTypeSize(E->getType(), SourceLocation()));
314 return llvm::ConstantInt::get(llvm::APInt(ResultWidth, Val));
318 llvm::Constant *VisitBinOr(const BinaryOperator *E) {
319 llvm::Constant *LHS = Visit(E->getLHS());
320 llvm::Constant *RHS = Visit(E->getRHS());
322 return llvm::ConstantExpr::getOr(LHS, RHS);
324 llvm::Constant *VisitBinSub(const BinaryOperator *E) {
325 llvm::Constant *LHS = Visit(E->getLHS());
326 llvm::Constant *RHS = Visit(E->getRHS());
328 if (!isa<llvm::PointerType>(RHS->getType())) {
330 if (isa<llvm::PointerType>(LHS->getType())) {
331 llvm::Constant *Idx = llvm::ConstantExpr::getNeg(RHS);
333 return llvm::ConstantExpr::getGetElementPtr(LHS, &Idx, 1);
337 return llvm::ConstantExpr::getSub(LHS, RHS);
340 assert(0 && "Unhandled bin sub case!");
344 llvm::Constant *VisitBinShl(const BinaryOperator *E) {
345 llvm::Constant *LHS = Visit(E->getLHS());
346 llvm::Constant *RHS = Visit(E->getRHS());
348 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
349 // RHS to the same size as the LHS.
350 if (LHS->getType() != RHS->getType())
351 RHS = llvm::ConstantExpr::getIntegerCast(RHS, LHS->getType(), false);
353 return llvm::ConstantExpr::getShl(LHS, RHS);
356 llvm::Constant *VisitBinMul(const BinaryOperator *E) {
357 llvm::Constant *LHS = Visit(E->getLHS());
358 llvm::Constant *RHS = Visit(E->getRHS());
360 return llvm::ConstantExpr::getMul(LHS, RHS);
363 llvm::Constant *VisitBinDiv(const BinaryOperator *E) {
364 llvm::Constant *LHS = Visit(E->getLHS());
365 llvm::Constant *RHS = Visit(E->getRHS());
367 if (LHS->getType()->isFPOrFPVector())
368 return llvm::ConstantExpr::getFDiv(LHS, RHS);
369 else if (E->getType()->isUnsignedIntegerType())
370 return llvm::ConstantExpr::getUDiv(LHS, RHS);
372 return llvm::ConstantExpr::getSDiv(LHS, RHS);
375 llvm::Constant *VisitBinAdd(const BinaryOperator *E) {
376 llvm::Constant *LHS = Visit(E->getLHS());
377 llvm::Constant *RHS = Visit(E->getRHS());
379 if (!E->getType()->isPointerType())
380 return llvm::ConstantExpr::getAdd(LHS, RHS);
382 llvm::Constant *Ptr, *Idx;
383 if (isa<llvm::PointerType>(LHS->getType())) { // pointer + int
386 } else { // int + pointer
391 return llvm::ConstantExpr::getGetElementPtr(Ptr, &Idx, 1);
394 llvm::Constant *VisitBinAnd(const BinaryOperator *E) {
395 llvm::Constant *LHS = Visit(E->getLHS());
396 llvm::Constant *RHS = Visit(E->getRHS());
398 return llvm::ConstantExpr::getAnd(LHS, RHS);
402 const llvm::Type *ConvertType(QualType T) {
403 return CGM.getTypes().ConvertType(T);
406 llvm::Constant *EmitConversionToBool(llvm::Constant *Src, QualType SrcType) {
407 assert(SrcType->isCanonical() && "EmitConversion strips typedefs");
409 if (SrcType->isRealFloatingType()) {
410 // Compare against 0.0 for fp scalars.
411 llvm::Constant *Zero = llvm::Constant::getNullValue(Src->getType());
412 return llvm::ConstantExpr::getFCmp(llvm::FCmpInst::FCMP_UNE, Src, Zero);
415 assert((SrcType->isIntegerType() || SrcType->isPointerType()) &&
416 "Unknown scalar type to convert");
418 // Compare against an integer or pointer null.
419 llvm::Constant *Zero = llvm::Constant::getNullValue(Src->getType());
420 return llvm::ConstantExpr::getICmp(llvm::ICmpInst::ICMP_NE, Src, Zero);
423 llvm::Constant *EmitConversion(llvm::Constant *Src, QualType SrcType,
425 SrcType = SrcType.getCanonicalType();
426 DstType = DstType.getCanonicalType();
427 if (SrcType == DstType) return Src;
429 // Handle conversions to bool first, they are special: comparisons against 0.
430 if (DstType->isBooleanType())
431 return EmitConversionToBool(Src, SrcType);
433 const llvm::Type *DstTy = ConvertType(DstType);
435 // Ignore conversions like int -> uint.
436 if (Src->getType() == DstTy)
439 // Handle pointer conversions next: pointers can only be converted to/from
440 // other pointers and integers.
441 if (isa<PointerType>(DstType)) {
442 // The source value may be an integer, or a pointer.
443 if (isa<llvm::PointerType>(Src->getType()))
444 return llvm::ConstantExpr::getBitCast(Src, DstTy);
445 assert(SrcType->isIntegerType() &&"Not ptr->ptr or int->ptr conversion?");
446 return llvm::ConstantExpr::getIntToPtr(Src, DstTy);
449 if (isa<PointerType>(SrcType)) {
450 // Must be an ptr to int cast.
451 assert(isa<llvm::IntegerType>(DstTy) && "not ptr->int?");
452 return llvm::ConstantExpr::getPtrToInt(Src, DstTy);
455 // A scalar source can be splatted to a vector of the same element type
456 if (isa<llvm::VectorType>(DstTy) && !isa<VectorType>(SrcType)) {
457 const llvm::VectorType *VT = cast<llvm::VectorType>(DstTy);
458 assert((VT->getElementType() == Src->getType()) &&
459 "Vector element type must match scalar type to splat.");
460 unsigned NumElements = DstType->getAsVectorType()->getNumElements();
461 llvm::SmallVector<llvm::Constant*, 16> Elements;
462 for (unsigned i = 0; i < NumElements; i++)
463 Elements.push_back(Src);
465 return llvm::ConstantVector::get(&Elements[0], NumElements);
468 if (isa<llvm::VectorType>(Src->getType()) ||
469 isa<llvm::VectorType>(DstTy)) {
470 return llvm::ConstantExpr::getBitCast(Src, DstTy);
473 // Finally, we have the arithmetic types: real int/float.
474 if (isa<llvm::IntegerType>(Src->getType())) {
475 bool InputSigned = SrcType->isSignedIntegerType();
476 if (isa<llvm::IntegerType>(DstTy))
477 return llvm::ConstantExpr::getIntegerCast(Src, DstTy, InputSigned);
478 else if (InputSigned)
479 return llvm::ConstantExpr::getSIToFP(Src, DstTy);
481 return llvm::ConstantExpr::getUIToFP(Src, DstTy);
484 assert(Src->getType()->isFloatingPoint() && "Unknown real conversion");
485 if (isa<llvm::IntegerType>(DstTy)) {
486 if (DstType->isSignedIntegerType())
487 return llvm::ConstantExpr::getFPToSI(Src, DstTy);
489 return llvm::ConstantExpr::getFPToUI(Src, DstTy);
492 assert(DstTy->isFloatingPoint() && "Unknown real conversion");
493 if (DstTy->getTypeID() < Src->getType()->getTypeID())
494 return llvm::ConstantExpr::getFPTrunc(Src, DstTy);
496 return llvm::ConstantExpr::getFPExtend(Src, DstTy);
499 llvm::Constant *EmitSizeAlignOf(QualType TypeToSize,
500 QualType RetType, bool isSizeOf) {
501 std::pair<uint64_t, unsigned> Info =
502 CGM.getContext().getTypeInfo(TypeToSize, SourceLocation());
504 uint64_t Val = isSizeOf ? Info.first : Info.second;
505 Val /= 8; // Return size in bytes, not bits.
507 assert(RetType->isIntegerType() && "Result type must be an integer!");
509 uint32_t ResultWidth = static_cast<uint32_t>(
510 CGM.getContext().getTypeSize(RetType, SourceLocation()));
511 return llvm::ConstantInt::get(llvm::APInt(ResultWidth, Val));
514 llvm::Constant *EmitLValue(Expr *E) {
515 switch (E->getStmtClass()) {
517 CGM.WarnUnsupported(E, "constant l-value expression");
518 llvm::Type *Ty = llvm::PointerType::getUnqual(ConvertType(E->getType()));
519 return llvm::UndefValue::get(Ty);
521 case Expr::ParenExprClass:
523 return EmitLValue(cast<ParenExpr>(E)->getSubExpr());
524 case Expr::CompoundLiteralExprClass: {
525 // Note that due to the nature of compound literals, this is guaranteed
526 // to be the only use of the variable, so we just generate it here.
527 CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E);
528 llvm::Constant* C = Visit(CLE->getInitializer());
529 C = new llvm::GlobalVariable(C->getType(),E->getType().isConstQualified(),
530 llvm::GlobalValue::InternalLinkage,
531 C, ".compoundliteral", &CGM.getModule());
534 case Expr::DeclRefExprClass: {
535 ValueDecl *Decl = cast<DeclRefExpr>(E)->getDecl();
536 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Decl))
537 return CGM.GetAddrOfFunctionDecl(FD, false);
538 if (const VarDecl* VD = dyn_cast<VarDecl>(Decl))
539 return CGM.GetAddrOfGlobalVar(VD, false);
540 // We can end up here with static block-scope variables (and others?)
541 // FIXME: How do we implement block-scope variables?!
542 assert(0 && "Unimplemented Decl type");
545 case Expr::MemberExprClass: {
546 MemberExpr* ME = cast<MemberExpr>(E);
547 llvm::Constant *Base;
549 Base = Visit(ME->getBase());
551 Base = EmitLValue(ME->getBase());
553 unsigned FieldNumber = CGM.getTypes().getLLVMFieldNo(ME->getMemberDecl());
554 llvm::Constant *Zero = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0);
555 llvm::Constant *Idx = llvm::ConstantInt::get(llvm::Type::Int32Ty,
557 llvm::Value *Ops[] = {Zero, Idx};
558 return llvm::ConstantExpr::getGetElementPtr(Base, Ops, 2);
560 case Expr::ArraySubscriptExprClass: {
561 ArraySubscriptExpr* ASExpr = cast<ArraySubscriptExpr>(E);
562 llvm::Constant *Base = Visit(ASExpr->getBase());
563 llvm::Constant *Index = Visit(ASExpr->getIdx());
564 assert(!ASExpr->getBase()->getType()->isVectorType() &&
565 "Taking the address of a vector component is illegal!");
566 return llvm::ConstantExpr::getGetElementPtr(Base, &Index, 1);
568 case Expr::StringLiteralClass: {
569 StringLiteral *String = cast<StringLiteral>(E);
570 assert(!String->isWide() && "Cannot codegen wide strings yet");
571 const char *StrData = String->getStrData();
572 unsigned Len = String->getByteLength();
574 return CGM.GetAddrOfConstantString(std::string(StrData, StrData + Len));
576 case Expr::UnaryOperatorClass: {
577 UnaryOperator *Exp = cast<UnaryOperator>(E);
578 switch (Exp->getOpcode()) {
579 default: assert(0 && "Unsupported unary operator.");
580 case UnaryOperator::Extension:
581 // Extension is just a wrapper for expressions
582 return EmitLValue(Exp->getSubExpr());
583 case UnaryOperator::Real:
584 case UnaryOperator::Imag: {
585 // The address of __real or __imag is just a GEP off the address
586 // of the internal expression
587 llvm::Constant* C = EmitLValue(Exp->getSubExpr());
588 llvm::Constant *Zero = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0);
589 llvm::Constant *Idx = llvm::ConstantInt::get(llvm::Type::Int32Ty,
590 Exp->getOpcode() == UnaryOperator::Imag);
591 llvm::Value *Ops[] = {Zero, Idx};
592 return llvm::ConstantExpr::getGetElementPtr(C, Ops, 2);
594 case UnaryOperator::Deref:
595 // The address of a deref is just the value of the expression
596 return Visit(Exp->getSubExpr());
604 } // end anonymous namespace.
607 llvm::Constant *CodeGenModule::EmitConstantExpr(const Expr *E)
609 QualType type = E->getType().getCanonicalType();
611 if (type->isIntegerType()) {
613 Value(static_cast<uint32_t>(Context.getTypeSize(type, SourceLocation())));
614 if (E->isIntegerConstantExpr(Value, Context)) {
615 return llvm::ConstantInt::get(Value);
619 return ConstExprEmitter(*this).Visit(const_cast<Expr*>(E));