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Tweaks to EmitLValue in CGExprConstant. Patch by Eli Friedman. 

llvm-svn: 46389
This commit is contained in:
Anders Carlsson 2008-01-26 04:30:23 +00:00
parent a413911373
commit 8a88c3815a
2 changed files with 50 additions and 41 deletions
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87
clang/CodeGen/CGExprConstant.cpp
View File

@ -22,7 +22,8 @@ using namespace clang;
using namespace CodeGen; using namespace CodeGen;
namespace { namespace {
class VISIBILITY_HIDDEN ConstExprEmitter : public StmtVisitor<ConstExprEmitter, llvm::Constant*> { class VISIBILITY_HIDDEN ConstExprEmitter :
public StmtVisitor<ConstExprEmitter, llvm::Constant*> {
CodeGenModule &CGM; CodeGenModule &CGM;
public: public:
ConstExprEmitter(CodeGenModule &cgm) ConstExprEmitter(CodeGenModule &cgm)
@ -285,7 +286,7 @@ public:
// The source value may be an integer, or a pointer. // The source value may be an integer, or a pointer.
if (isa<llvm::PointerType>(Src->getType())) if (isa<llvm::PointerType>(Src->getType()))
return llvm::ConstantExpr::getBitCast(Src, DstTy); return llvm::ConstantExpr::getBitCast(Src, DstTy);
assert(SrcType->isIntegerType() && "Not ptr->ptr or int->ptr conversion?"); assert(SrcType->isIntegerType() &&"Not ptr->ptr or int->ptr conversion?");
return llvm::ConstantExpr::getIntToPtr(Src, DstTy); return llvm::ConstantExpr::getIntToPtr(Src, DstTy);
} }
@ -353,8 +354,8 @@ public:
CGM.getContext().getTypeSize(RetType, SourceLocation())); CGM.getContext().getTypeSize(RetType, SourceLocation()));
return llvm::ConstantInt::get(llvm::APInt(ResultWidth, Val)); return llvm::ConstantInt::get(llvm::APInt(ResultWidth, Val));
} }
llvm::Constant *EmitLValue(const Expr *E) { llvm::Constant *EmitLValue(Expr *E) {
switch (E->getStmtClass()) { switch (E->getStmtClass()) {
default: { default: {
CGM.WarnUnsupported(E, "constant l-value expression"); CGM.WarnUnsupported(E, "constant l-value expression");
@ -367,15 +368,15 @@ public:
case Expr::CompoundLiteralExprClass: { case Expr::CompoundLiteralExprClass: {
// Note that due to the nature of compound literals, this is guaranteed // Note that due to the nature of compound literals, this is guaranteed
// to be the only use of the variable, so we just generate it here. // to be the only use of the variable, so we just generate it here.
const CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E); CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E);
llvm::Constant* C = CGM.EmitGlobalInit(CLE->getInitializer()); llvm::Constant* C = Visit(CLE->getInitializer());
C =new llvm::GlobalVariable(C->getType(), E->getType().isConstQualified(), C = new llvm::GlobalVariable(C->getType(), E->getType().isConstQualified(),
llvm::GlobalValue::InternalLinkage, llvm::GlobalValue::InternalLinkage,
C, ".compoundliteral", &CGM.getModule()); C, ".compoundliteral", &CGM.getModule());
return C; return C;
} }
case Expr::DeclRefExprClass: { case Expr::DeclRefExprClass: {
const ValueDecl *Decl = cast<DeclRefExpr>(E)->getDecl(); ValueDecl *Decl = cast<DeclRefExpr>(E)->getDecl();
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Decl)) if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Decl))
return CGM.GetAddrOfFunctionDecl(FD, false); return CGM.GetAddrOfFunctionDecl(FD, false);
if (const FileVarDecl* FVD = dyn_cast<FileVarDecl>(Decl)) if (const FileVarDecl* FVD = dyn_cast<FileVarDecl>(Decl))
@ -386,9 +387,13 @@ public:
return 0; return 0;
} }
case Expr::MemberExprClass: { case Expr::MemberExprClass: {
const MemberExpr* ME = cast<MemberExpr>(E); MemberExpr* ME = cast<MemberExpr>(E);
unsigned FieldNumber = CGM.getTypes().getLLVMFieldNo(ME->getMemberDecl()); unsigned FieldNumber = CGM.getTypes().getLLVMFieldNo(ME->getMemberDecl());
llvm::Constant *Base = EmitLValue(ME->getBase()); llvm::Constant *Base;
if (ME->isArrow())
Base = Visit(ME->getBase());
else
Base = EmitLValue(ME->getBase());
llvm::Constant *Zero = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0); llvm::Constant *Zero = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0);
llvm::Constant *Idx = llvm::ConstantInt::get(llvm::Type::Int32Ty, llvm::Constant *Idx = llvm::ConstantInt::get(llvm::Type::Int32Ty,
FieldNumber); FieldNumber);
@ -396,46 +401,46 @@ public:
return llvm::ConstantExpr::getGetElementPtr(Base, Ops, 2); return llvm::ConstantExpr::getGetElementPtr(Base, Ops, 2);
} }
case Expr::ArraySubscriptExprClass: { case Expr::ArraySubscriptExprClass: {
const ArraySubscriptExpr* ASExpr = cast<ArraySubscriptExpr>(E); ArraySubscriptExpr* ASExpr = cast<ArraySubscriptExpr>(E);
llvm::Constant *Base = EmitLValue(ASExpr->getBase()); llvm::Constant *Base = Visit(ASExpr->getBase());
llvm::Constant *Index = EmitLValue(ASExpr->getIdx()); llvm::Constant *Index = Visit(ASExpr->getIdx());
assert(!ASExpr->getBase()->getType()->isVectorType() && assert(!ASExpr->getBase()->getType()->isVectorType() &&
"Taking the address of a vector component is illegal!"); "Taking the address of a vector component is illegal!");
return llvm::ConstantExpr::getGetElementPtr(Base, &Index, 1); return llvm::ConstantExpr::getGetElementPtr(Base, &Index, 1);
} }
case Expr::StringLiteralClass: { case Expr::StringLiteralClass: {
const StringLiteral *String = cast<StringLiteral>(E); StringLiteral *String = cast<StringLiteral>(E);
assert(!String->isWide() && "Cannot codegen wide strings yet"); assert(!String->isWide() && "Cannot codegen wide strings yet");
const char *StrData = String->getStrData(); const char *StrData = String->getStrData();
unsigned Len = String->getByteLength(); unsigned Len = String->getByteLength();
return CGM.GetAddrOfConstantString(std::string(StrData, StrData + Len)); return CGM.GetAddrOfConstantString(std::string(StrData, StrData + Len));
} }
case Expr::UnaryOperatorClass: { case Expr::UnaryOperatorClass: {
const UnaryOperator *Exp = cast<UnaryOperator>(E); UnaryOperator *Exp = cast<UnaryOperator>(E);
switch (Exp->getOpcode()) { switch (Exp->getOpcode()) {
default: assert(0 && "Unsupported unary operator."); default: assert(0 && "Unsupported unary operator.");
case UnaryOperator::Extension: case UnaryOperator::Extension:
// Extension is just a wrapper for expressions // Extension is just a wrapper for expressions
return EmitLValue(Exp->getSubExpr()); return EmitLValue(Exp->getSubExpr());
case UnaryOperator::Real: case UnaryOperator::Real:
case UnaryOperator::Imag: { case UnaryOperator::Imag: {
// The address of __real or __imag is just a GEP off the address // The address of __real or __imag is just a GEP off the address
// of the internal expression // of the internal expression
llvm::Constant* C = EmitLValue(Exp->getSubExpr()); llvm::Constant* C = EmitLValue(Exp->getSubExpr());
llvm::Constant *Zero = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0); llvm::Constant *Zero = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0);
llvm::Constant *Idx = llvm::ConstantInt::get(llvm::Type::Int32Ty, llvm::Constant *Idx = llvm::ConstantInt::get(llvm::Type::Int32Ty,
Exp->getOpcode() == UnaryOperator::Imag); Exp->getOpcode() == UnaryOperator::Imag);
llvm::Value *Ops[] = {Zero, Idx}; llvm::Value *Ops[] = {Zero, Idx};
return llvm::ConstantExpr::getGetElementPtr(C, Ops, 2); return llvm::ConstantExpr::getGetElementPtr(C, Ops, 2);
} }
case UnaryOperator::Deref: case UnaryOperator::Deref:
// The address of a deref is just the value of the expression // The address of a deref is just the value of the expression
return Visit(Exp->getSubExpr()); return Visit(Exp->getSubExpr());
}
} }
}
} }
}
}
}; };

4
clang/clang.xcodeproj/project.pbxproj
View File

@ -9,6 +9,7 @@
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1A869A700BA2164C008DA07A /* LiteralSupport.h in CopyFiles */ = {isa = PBXBuildFile; fileRef = 1A869A6E0BA2164C008DA07A /* LiteralSupport.h */; }; 1A869A700BA2164C008DA07A /* LiteralSupport.h in CopyFiles */ = {isa = PBXBuildFile; fileRef = 1A869A6E0BA2164C008DA07A /* LiteralSupport.h */; };
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@ -221,6 +222,7 @@
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@ -580,6 +582,7 @@
DE4772FB0C10EAEC002239E8 /* CGExpr.cpp */, DE4772FB0C10EAEC002239E8 /* CGExpr.cpp */,
DEF2EFF20C6CDD74000C4259 /* CGExprAgg.cpp */, DEF2EFF20C6CDD74000C4259 /* CGExprAgg.cpp */,
DE224FF70C7AA98800D370A5 /* CGExprComplex.cpp */, DE224FF70C7AA98800D370A5 /* CGExprComplex.cpp */,
1A376A2C0D4AED9B002A1C52 /* CGExprConstant.cpp */,
DE22526F0C7E82D000D370A5 /* CGExprScalar.cpp */, DE22526F0C7E82D000D370A5 /* CGExprScalar.cpp */,
1A7342470C7B57D500122F56 /* CGObjC.cpp */, 1A7342470C7B57D500122F56 /* CGObjC.cpp */,
DE4772F90C10EAE5002239E8 /* CGStmt.cpp */, DE4772F90C10EAE5002239E8 /* CGStmt.cpp */,
@ -901,6 +904,7 @@
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DE47999C0D2EBE1A00706D2D /* SemaExprObjC.cpp in Sources */, DE47999C0D2EBE1A00706D2D /* SemaExprObjC.cpp in Sources */,
03F50AC60D416EAA00B9CF60 /* Targets.cpp in Sources */, 03F50AC60D416EAA00B9CF60 /* Targets.cpp in Sources */,
1A376A2D0D4AED9B002A1C52 /* CGExprConstant.cpp in Sources */,
); );
runOnlyForDeploymentPostprocessing = 0; runOnlyForDeploymentPostprocessing = 0;
}; };