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Eliminate a bunch of code which should be dead. 

llvm-svn: 65267
This commit is contained in:
Eli Friedman 2009-02-22 07:29:04 +00:00
parent 075d642e24
commit 825fe7565e
1 changed files with 5 additions and 194 deletions
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199
clang/lib/CodeGen/CGExprConstant.cpp
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@ -59,9 +59,11 @@ public:
const llvm::Type *Ty = ConvertType(E->getType()); const llvm::Type *Ty = ConvertType(E->getType());
return EmitUnion(CGM.EmitConstantExpr(E->getSubExpr(), CGF), Ty); return EmitUnion(CGM.EmitConstantExpr(E->getSubExpr(), CGF), Ty);
} }
if (CGM.getContext().getCanonicalType(E->getSubExpr()->getType()) ==
llvm::Constant *C = Visit(E->getSubExpr()); CGM.getContext().getCanonicalType(E->getType())) {
return EmitConversion(C, E->getSubExpr()->getType(), E->getType()); return Visit(E->getSubExpr());
}
return 0;
} }
llvm::Constant *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { llvm::Constant *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
@ -341,33 +343,6 @@ public:
return 0; return 0;
} }
llvm::Constant *VisitImplicitCastExpr(ImplicitCastExpr *ICExpr) {
Expr* SExpr = ICExpr->getSubExpr();
QualType SType = SExpr->getType();
llvm::Constant *C; // the intermediate expression
QualType T; // the type of the intermediate expression
if (SType->isArrayType()) {
// Arrays decay to a pointer to the first element
// VLAs would require special handling, but they can't occur here
C = EmitLValue(SExpr);
llvm::Constant *Idx0 = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0);
llvm::Constant *Ops[] = {Idx0, Idx0};
C = llvm::ConstantExpr::getGetElementPtr(C, Ops, 2);
T = CGM.getContext().getArrayDecayedType(SType);
} else if (SType->isFunctionType()) {
// Function types decay to a pointer to the function
C = EmitLValue(SExpr);
T = CGM.getContext().getPointerType(SType);
} else {
C = Visit(SExpr);
T = SType;
}
// Perform the conversion; note that an implicit cast can both promote
// and convert an array/function
return EmitConversion(C, T, ICExpr->getType());
}
llvm::Constant *VisitStringLiteral(StringLiteral *E) { llvm::Constant *VisitStringLiteral(StringLiteral *E) {
assert(!E->getType()->isPointerType() && "Strings are always arrays"); assert(!E->getType()->isPointerType() && "Strings are always arrays");
@ -380,124 +355,16 @@ public:
llvm::Constant *VisitUnaryExtension(const UnaryOperator *E) { llvm::Constant *VisitUnaryExtension(const UnaryOperator *E) {
return Visit(E->getSubExpr()); return Visit(E->getSubExpr());
} }
llvm::Constant *VisitBlockExpr(const BlockExpr *E) {
assert (!E->hasBlockDeclRefExprs() && "global block with BlockDeclRefs");
const char *Name = "";
if (const NamedDecl *ND = dyn_cast<NamedDecl>(CGF->CurFuncDecl))
Name = ND->getNameAsString().c_str();
return CGM.GetAddrOfGlobalBlock(E, Name);
}
// Utility methods // Utility methods
const llvm::Type *ConvertType(QualType T) { const llvm::Type *ConvertType(QualType T) {
return CGM.getTypes().ConvertType(T); return CGM.getTypes().ConvertType(T);
} }
llvm::Constant *EmitConversionToBool(llvm::Constant *Src, QualType SrcType) {
assert(SrcType->isCanonical() && "EmitConversion strips typedefs");
if (SrcType->isRealFloatingType()) {
// Compare against 0.0 for fp scalars.
llvm::Constant *Zero = llvm::Constant::getNullValue(Src->getType());
return llvm::ConstantExpr::getFCmp(llvm::FCmpInst::FCMP_UNE, Src, Zero);
}
assert((SrcType->isIntegerType() || SrcType->isPointerType()) &&
"Unknown scalar type to convert");
// Compare against an integer or pointer null.
llvm::Constant *Zero = llvm::Constant::getNullValue(Src->getType());
return llvm::ConstantExpr::getICmp(llvm::ICmpInst::ICMP_NE, Src, Zero);
}
llvm::Constant *EmitConversion(llvm::Constant *Src, QualType SrcType,
QualType DstType) {
if (!Src)
return 0;
SrcType = CGM.getContext().getCanonicalType(SrcType);
DstType = CGM.getContext().getCanonicalType(DstType);
if (SrcType == DstType) return Src;
// Handle conversions to bool first, they are special: comparisons against 0.
if (DstType->isBooleanType())
return EmitConversionToBool(Src, SrcType);
const llvm::Type *DstTy = ConvertType(DstType);
// Ignore conversions like int -> uint.
if (Src->getType() == DstTy)
return Src;
// Handle pointer conversions next: pointers can only be converted to/from
// other pointers and integers.
if (isa<llvm::PointerType>(DstTy)) {
// The source value may be an integer, or a pointer.
if (isa<llvm::PointerType>(Src->getType()))
return llvm::ConstantExpr::getBitCast(Src, DstTy);
assert(SrcType->isIntegerType() &&"Not ptr->ptr or int->ptr conversion?");
return llvm::ConstantExpr::getIntToPtr(Src, DstTy);
}
if (isa<llvm::PointerType>(Src->getType())) {
// Must be an ptr to int cast.
assert(isa<llvm::IntegerType>(DstTy) && "not ptr->int?");
return llvm::ConstantExpr::getPtrToInt(Src, DstTy);
}
// A scalar source can be splatted to a vector of the same element type
if (isa<llvm::VectorType>(DstTy) && !isa<VectorType>(SrcType)) {
assert((cast<llvm::VectorType>(DstTy)->getElementType()
== Src->getType()) &&
"Vector element type must match scalar type to splat.");
unsigned NumElements = DstType->getAsVectorType()->getNumElements();
llvm::SmallVector<llvm::Constant*, 16> Elements;
for (unsigned i = 0; i < NumElements; i++)
Elements.push_back(Src);
return llvm::ConstantVector::get(&Elements[0], NumElements);
}
if (isa<llvm::VectorType>(Src->getType()) ||
isa<llvm::VectorType>(DstTy)) {
return llvm::ConstantExpr::getBitCast(Src, DstTy);
}
// Finally, we have the arithmetic types: real int/float.
if (isa<llvm::IntegerType>(Src->getType())) {
bool InputSigned = SrcType->isSignedIntegerType();
if (isa<llvm::IntegerType>(DstTy))
return llvm::ConstantExpr::getIntegerCast(Src, DstTy, InputSigned);
else if (InputSigned)
return llvm::ConstantExpr::getSIToFP(Src, DstTy);
else
return llvm::ConstantExpr::getUIToFP(Src, DstTy);
}
assert(Src->getType()->isFloatingPoint() && "Unknown real conversion");
if (isa<llvm::IntegerType>(DstTy)) {
if (DstType->isSignedIntegerType())
return llvm::ConstantExpr::getFPToSI(Src, DstTy);
else
return llvm::ConstantExpr::getFPToUI(Src, DstTy);
}
assert(DstTy->isFloatingPoint() && "Unknown real conversion");
if (DstTy->getTypeID() < Src->getType()->getTypeID())
return llvm::ConstantExpr::getFPTrunc(Src, DstTy);
else
return llvm::ConstantExpr::getFPExtend(Src, DstTy);
}
public: public:
llvm::Constant *EmitLValue(Expr *E) { llvm::Constant *EmitLValue(Expr *E) {
switch (E->getStmtClass()) { switch (E->getStmtClass()) {
default: break; default: break;
case Expr::ParenExprClass:
// Elide parenthesis
return EmitLValue(cast<ParenExpr>(E)->getSubExpr());
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.
@ -526,37 +393,6 @@ public:
} }
break; break;
} }
case Expr::MemberExprClass: {
MemberExpr* ME = cast<MemberExpr>(E);
llvm::Constant *Base;
if (ME->isArrow())
Base = Visit(ME->getBase());
else
Base = EmitLValue(ME->getBase());
if (!Base)
return 0;
FieldDecl *Field = dyn_cast<FieldDecl>(ME->getMemberDecl());
// FIXME: Handle other kinds of member expressions.
assert(Field && "No code generation for non-field member expressions");
unsigned FieldNumber = CGM.getTypes().getLLVMFieldNo(Field);
llvm::Constant *Zero = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0);
llvm::Constant *Idx = llvm::ConstantInt::get(llvm::Type::Int32Ty,
FieldNumber);
llvm::Value *Ops[] = {Zero, Idx};
return llvm::ConstantExpr::getGetElementPtr(Base, Ops, 2);
}
case Expr::ArraySubscriptExprClass: {
ArraySubscriptExpr* ASExpr = cast<ArraySubscriptExpr>(E);
assert(!ASExpr->getBase()->getType()->isVectorType() &&
"Taking the address of a vector component is illegal!");
llvm::Constant *Base = Visit(ASExpr->getBase());
llvm::Constant *Index = Visit(ASExpr->getIdx());
if (!Base || !Index)
return 0;
return llvm::ConstantExpr::getGetElementPtr(Base, &Index, 1);
}
case Expr::StringLiteralClass: case Expr::StringLiteralClass:
return CGM.GetAddrOfConstantStringFromLiteral(cast<StringLiteral>(E)); return CGM.GetAddrOfConstantStringFromLiteral(cast<StringLiteral>(E));
case Expr::ObjCStringLiteralClass: { case Expr::ObjCStringLiteralClass: {
@ -566,31 +402,6 @@ public:
llvm::Constant *C = CGM.getObjCRuntime().GenerateConstantString(S); llvm::Constant *C = CGM.getObjCRuntime().GenerateConstantString(S);
return llvm::ConstantExpr::getBitCast(C, ConvertType(E->getType())); return llvm::ConstantExpr::getBitCast(C, ConvertType(E->getType()));
} }
case Expr::UnaryOperatorClass: {
UnaryOperator *Exp = cast<UnaryOperator>(E);
switch (Exp->getOpcode()) {
default: break;
case UnaryOperator::Extension:
// Extension is just a wrapper for expressions
return EmitLValue(Exp->getSubExpr());
case UnaryOperator::Real:
case UnaryOperator::Imag: {
// The address of __real or __imag is just a GEP off the address
// of the internal expression
llvm::Constant* C = EmitLValue(Exp->getSubExpr());
llvm::Constant *Zero = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0);
llvm::Constant *Idx = llvm::ConstantInt::get(llvm::Type::Int32Ty,
Exp->getOpcode() == UnaryOperator::Imag);
llvm::Value *Ops[] = {Zero, Idx};
return llvm::ConstantExpr::getGetElementPtr(C, Ops, 2);
}
case UnaryOperator::Deref:
// The address of a deref is just the value of the expression
return Visit(Exp->getSubExpr());
}
break;
}
case Expr::PredefinedExprClass: { case Expr::PredefinedExprClass: {
// __func__/__FUNCTION__ -> "". __PRETTY_FUNCTION__ -> "top level". // __func__/__FUNCTION__ -> "". __PRETTY_FUNCTION__ -> "top level".
std::string Str; std::string Str;