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implement the alias attirbute (in both Sema and Codegen)

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llvm-svn: 52092
This commit is contained in:
Nuno Lopes
2008-06-08 15:45:52 +00:00
parent 486c7d3fa5
commit b6f7953818
8 changed files with 95 additions and 18 deletions
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56
clang/lib/CodeGen/CodeGenModule.cpp
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@@ -188,6 +188,24 @@ bool hasAggregateLLVMType(QualType T) {
!T->isVoidType() && !T->isVectorType() && !T->isFunctionType();
}
void CodeGenModule::SetGlobalValueAttributes(const FunctionDecl *FD,
llvm::GlobalValue *GV) {
// TODO: Set up linkage and many other things. Note, this is a simple
// approximation of what we really want.
if (FD->getStorageClass() == FunctionDecl::Static)
GV->setLinkage(llvm::Function::InternalLinkage);
else if (FD->getAttr<DLLImportAttr>())
GV->setLinkage(llvm::Function::DLLImportLinkage);
else if (FD->getAttr<DLLExportAttr>())
GV->setLinkage(llvm::Function::DLLExportLinkage);
else if (FD->getAttr<WeakAttr>() || FD->isInline())
GV->setLinkage(llvm::Function::WeakLinkage);
if (const VisibilityAttr *attr = FD->getAttr<VisibilityAttr>())
CodeGenModule::setVisibility(GV, attr->getVisibility());
// FIXME: else handle -fvisibility
}
void CodeGenModule::SetFunctionAttributes(const FunctionDecl *FD,
llvm::Function *F,
const llvm::FunctionType *FTy) {
@@ -230,20 +248,7 @@ void CodeGenModule::SetFunctionAttributes(const FunctionDecl *FD,
if (FD->getAttr<FastCallAttr>())
F->setCallingConv(llvm::CallingConv::Fast);
// TODO: Set up linkage and many other things. Note, this is a simple
// approximation of what we really want.
if (FD->getStorageClass() == FunctionDecl::Static)
F->setLinkage(llvm::Function::InternalLinkage);
else if (FD->getAttr<DLLImportAttr>())
F->setLinkage(llvm::Function::DLLImportLinkage);
else if (FD->getAttr<DLLExportAttr>())
F->setLinkage(llvm::Function::DLLExportLinkage);
else if (FD->getAttr<WeakAttr>() || FD->isInline())
F->setLinkage(llvm::Function::WeakLinkage);
if (const VisibilityAttr *attr = FD->getAttr<VisibilityAttr>())
CodeGenModule::setVisibility(F, attr->getVisibility());
// FIXME: else handle -fvisibility
SetGlobalValueAttributes(FD, F);
}
@@ -263,8 +268,20 @@ llvm::Constant *CodeGenModule::GetAddrOfFunctionDecl(const FunctionDecl *D,
// If it doesn't already exist, just create and return an entry.
if (F == 0) {
// FIXME: param attributes for sext/zext etc.
F = llvm::Function::Create(FTy, llvm::Function::ExternalLinkage,
D->getName(), &getModule());
if (D->getBody() || !D->getAttr<AliasAttr>())
F = llvm::Function::Create(FTy, llvm::Function::ExternalLinkage,
D->getName(), &getModule());
else {
const std::string& aliaseeName = D->getAttr<AliasAttr>()->getAliasee();
llvm::Function *aliasee = getModule().getFunction(aliaseeName);
llvm::GlobalValue *alias = new llvm::GlobalAlias(aliasee->getType(),
llvm::Function::ExternalLinkage,
D->getName(),
aliasee,
&getModule());
SetGlobalValueAttributes(D, alias);
return Entry = alias;
}
SetFunctionAttributes(D, F, FTy);
return Entry = F;
@@ -494,8 +511,11 @@ void CodeGenModule::EmitObjCClassImplementation(
void CodeGenModule::EmitFunction(const FunctionDecl *FD) {
// If this is not a prototype, emit the body.
if (!FD->isThisDeclarationADefinition())
if (!FD->isThisDeclarationADefinition()) {
if (FD->getAttr<AliasAttr>())
GetAddrOfFunctionDecl(FD, true);
return;
}
// If the function is a static, defer code generation until later so we can
// easily omit unused statics.
@@ -534,6 +554,8 @@ void CodeGenModule::EmitStatics() {
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
if (FD->getBody())
CodeGenFunction(*this).GenerateCode(FD);
else if (FD->getAttr<AliasAttr>())
GetAddrOfFunctionDecl(FD, true);
} else {
EmitGlobalVarInit(cast<VarDecl>(D));
}