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Re-introduce the ctor/dtor alias optimization, this time hidden behind a

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command-line option which defaults off.

llvm-svn: 96649
This commit is contained in:
John McCall
2010-02-19 01:32:20 +00:00
parent 5481d329a3
commit d4324148d7
9 changed files with 158 additions and 31 deletions
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29
clang/lib/CodeGen/CodeGenModule.cpp
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@@ -316,24 +316,20 @@ GetLinkageForFunction(ASTContext &Context, const FunctionDecl *FD,
return CodeGenModule::GVA_CXXInline;
}
/// SetFunctionDefinitionAttributes - Set attributes for a global.
///
/// FIXME: This is currently only done for aliases and functions, but not for
/// variables (these details are set in EmitGlobalVarDefinition for variables).
void CodeGenModule::SetFunctionDefinitionAttributes(const FunctionDecl *D,
llvm::GlobalValue *GV) {
llvm::GlobalValue::LinkageTypes
CodeGenModule::getFunctionLinkage(const FunctionDecl *D) {
GVALinkage Linkage = GetLinkageForFunction(getContext(), D, Features);
if (Linkage == GVA_Internal) {
GV->setLinkage(llvm::Function::InternalLinkage);
return llvm::Function::InternalLinkage;
} else if (D->hasAttr<DLLExportAttr>()) {
GV->setLinkage(llvm::Function::DLLExportLinkage);
return llvm::Function::DLLExportLinkage;
} else if (D->hasAttr<WeakAttr>()) {
GV->setLinkage(llvm::Function::WeakAnyLinkage);
return llvm::Function::WeakAnyLinkage;
} else if (Linkage == GVA_C99Inline) {
// In C99 mode, 'inline' functions are guaranteed to have a strong
// definition somewhere else, so we can use available_externally linkage.
GV->setLinkage(llvm::Function::AvailableExternallyLinkage);
return llvm::Function::AvailableExternallyLinkage;
} else if (Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation) {
// In C++, the compiler has to emit a definition in every translation unit
// that references the function. We should use linkonce_odr because
@@ -341,13 +337,22 @@ void CodeGenModule::SetFunctionDefinitionAttributes(const FunctionDecl *D,
// don't need to codegen it. b) if the function persists, it needs to be
// merged with other definitions. c) C++ has the ODR, so we know the
// definition is dependable.
GV->setLinkage(llvm::Function::LinkOnceODRLinkage);
return llvm::Function::LinkOnceODRLinkage;
} else {
assert(Linkage == GVA_StrongExternal);
// Otherwise, we have strong external linkage.
GV->setLinkage(llvm::Function::ExternalLinkage);
return llvm::Function::ExternalLinkage;
}
}
/// SetFunctionDefinitionAttributes - Set attributes for a global.
///
/// FIXME: This is currently only done for aliases and functions, but not for
/// variables (these details are set in EmitGlobalVarDefinition for variables).
void CodeGenModule::SetFunctionDefinitionAttributes(const FunctionDecl *D,
llvm::GlobalValue *GV) {
GV->setLinkage(getFunctionLinkage(D));
SetCommonAttributes(D, GV);
}