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-rw-r--r--clang/lib/CodeGen/CGCXX.cpp113
-rw-r--r--clang/lib/CodeGen/CodeGenModule.cpp29
-rw-r--r--clang/lib/CodeGen/CodeGenModule.h26
3 files changed, 26 insertions, 142 deletions
diff --git a/clang/lib/CodeGen/CGCXX.cpp b/clang/lib/CodeGen/CGCXX.cpp
index f0d01969a9c..c4c52aac034 100644
--- a/clang/lib/CodeGen/CGCXX.cpp
+++ b/clang/lib/CodeGen/CGCXX.cpp
@@ -26,88 +26,17 @@
using namespace clang;
using namespace CodeGen;
-/// Try to emit a definition as a global alias for another definition.
-bool CodeGenModule::TryEmitDefinitionAsAlias(GlobalDecl AliasDecl,
- GlobalDecl TargetDecl) {
- // Find the referrent.
- llvm::GlobalValue *Ref = cast<llvm::GlobalValue>(GetAddrOfGlobal(TargetDecl));
-
- // Look for an existing entry.
- const char *MangledName = getMangledName(AliasDecl);
- llvm::GlobalValue *&Entry = GlobalDeclMap[MangledName];
- if (Entry) {
- assert(Entry->isDeclaration() && "definition already exists for alias");
- assert(Entry->getType() == Ref->getType() &&
- "declaration exists with different type");
- }
-
- // The alias will use the linkage of the referrent. If we can't
- // support aliases with that linkage, fail.
- llvm::GlobalValue::LinkageTypes Linkage
- = getFunctionLinkage(cast<FunctionDecl>(AliasDecl.getDecl()));
-
- switch (Linkage) {
- // We can definitely emit aliases to definitions with external linkage.
- case llvm::GlobalValue::ExternalLinkage:
- case llvm::GlobalValue::ExternalWeakLinkage:
- break;
-
- // Same with local linkage.
- case llvm::GlobalValue::InternalLinkage:
- case llvm::GlobalValue::PrivateLinkage:
- case llvm::GlobalValue::LinkerPrivateLinkage:
- break;
-
- // We should try to support linkonce linkages.
- case llvm::GlobalValue::LinkOnceAnyLinkage:
- case llvm::GlobalValue::LinkOnceODRLinkage:
- return true;
-
- // Other linkages will probably never be supported.
- default:
- return true;
- }
-
- // Create the alias with no name.
- llvm::GlobalAlias *Alias =
- new llvm::GlobalAlias(Ref->getType(), Linkage, "", Ref, &getModule());
-
- // Switch any previous uses to the alias and continue.
- if (Entry) {
- Entry->replaceAllUsesWith(Alias);
- Entry->eraseFromParent();
- }
- Entry = Alias;
-
- // Finally, set up the alias with its proper name and attributes.
- Alias->setName(MangledName);
- SetCommonAttributes(AliasDecl.getDecl(), Alias);
-
- return false;
-}
void CodeGenModule::EmitCXXConstructors(const CXXConstructorDecl *D) {
- // The constructor used for constructing this as a base class;
- // ignores virtual bases.
- EmitGlobal(GlobalDecl(D, Ctor_Base));
-
- // The constructor used for constructing this as a complete class;
- // constucts the virtual bases, then calls the base constructor.
EmitGlobal(GlobalDecl(D, Ctor_Complete));
+ EmitGlobal(GlobalDecl(D, Ctor_Base));
}
void CodeGenModule::EmitCXXConstructor(const CXXConstructorDecl *D,
CXXCtorType Type) {
- // The complete constructor is equivalent to the base constructor
- // for classes with no virtual bases. Try to emit it as an alias.
- if (Type == Ctor_Complete &&
- !D->getParent()->getNumVBases() &&
- !TryEmitDefinitionAsAlias(GlobalDecl(D, Ctor_Complete),
- GlobalDecl(D, Ctor_Base)))
- return;
- llvm::Function *Fn = cast<llvm::Function>(GetAddrOfCXXConstructor(D, Type));
+ llvm::Function *Fn = GetAddrOfCXXConstructor(D, Type);
CodeGenFunction(*this).GenerateCode(GlobalDecl(D, Type), Fn);
@@ -115,17 +44,15 @@ void CodeGenModule::EmitCXXConstructor(const CXXConstructorDecl *D,
SetLLVMFunctionAttributesForDefinition(D, Fn);
}
-llvm::GlobalValue *
+llvm::Function *
CodeGenModule::GetAddrOfCXXConstructor(const CXXConstructorDecl *D,
CXXCtorType Type) {
- const char *Name = getMangledCXXCtorName(D, Type);
- if (llvm::GlobalValue *V = GlobalDeclMap[Name])
- return V;
-
const FunctionProtoType *FPT = D->getType()->getAs<FunctionProtoType>();
const llvm::FunctionType *FTy =
getTypes().GetFunctionType(getTypes().getFunctionInfo(D, Type),
FPT->isVariadic());
+
+ const char *Name = getMangledCXXCtorName(D, Type);
return cast<llvm::Function>(
GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(D, Type)));
}
@@ -140,32 +67,15 @@ const char *CodeGenModule::getMangledCXXCtorName(const CXXConstructorDecl *D,
}
void CodeGenModule::EmitCXXDestructors(const CXXDestructorDecl *D) {
- // The destructor used for destructing this as a base class; ignores
- // virtual bases.
- EmitGlobal(GlobalDecl(D, Dtor_Base));
-
- // The destructor used for destructing this as a most-derived class;
- // call the base destructor and then destructs any virtual bases.
- EmitGlobal(GlobalDecl(D, Dtor_Complete));
-
- // The destructor in a virtual table is always a 'deleting'
- // destructor, which calls the complete destructor and then uses the
- // appropriate operator delete.
if (D->isVirtual())
EmitGlobal(GlobalDecl(D, Dtor_Deleting));
+ EmitGlobal(GlobalDecl(D, Dtor_Complete));
+ EmitGlobal(GlobalDecl(D, Dtor_Base));
}
void CodeGenModule::EmitCXXDestructor(const CXXDestructorDecl *D,
CXXDtorType Type) {
- // The complete destructor is equivalent to the base destructor for
- // classes with no virtual bases, so try to emit it as an alias.
- if (Type == Dtor_Complete &&
- !D->getParent()->getNumVBases() &&
- !TryEmitDefinitionAsAlias(GlobalDecl(D, Dtor_Complete),
- GlobalDecl(D, Dtor_Base)))
- return;
-
- llvm::Function *Fn = cast<llvm::Function>(GetAddrOfCXXDestructor(D, Type));
+ llvm::Function *Fn = GetAddrOfCXXDestructor(D, Type);
CodeGenFunction(*this).GenerateCode(GlobalDecl(D, Type), Fn);
@@ -173,16 +83,13 @@ void CodeGenModule::EmitCXXDestructor(const CXXDestructorDecl *D,
SetLLVMFunctionAttributesForDefinition(D, Fn);
}
-llvm::GlobalValue *
+llvm::Function *
CodeGenModule::GetAddrOfCXXDestructor(const CXXDestructorDecl *D,
CXXDtorType Type) {
- const char *Name = getMangledCXXDtorName(D, Type);
- if (llvm::GlobalValue *V = GlobalDeclMap[Name])
- return V;
-
const llvm::FunctionType *FTy =
getTypes().GetFunctionType(getTypes().getFunctionInfo(D, Type), false);
+ const char *Name = getMangledCXXDtorName(D, Type);
return cast<llvm::Function>(
GetOrCreateLLVMFunction(Name, FTy, GlobalDecl(D, Type)));
}
diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 41575e41e53..5a552c490ac 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -316,20 +316,24 @@ GetLinkageForFunction(ASTContext &Context, const FunctionDecl *FD,
return CodeGenModule::GVA_CXXInline;
}
-llvm::GlobalValue::LinkageTypes
-CodeGenModule::getFunctionLinkage(const FunctionDecl *D) {
+/// 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) {
GVALinkage Linkage = GetLinkageForFunction(getContext(), D, Features);
if (Linkage == GVA_Internal) {
- return llvm::Function::InternalLinkage;
+ GV->setLinkage(llvm::Function::InternalLinkage);
} else if (D->hasAttr<DLLExportAttr>()) {
- return llvm::Function::DLLExportLinkage;
+ GV->setLinkage(llvm::Function::DLLExportLinkage);
} else if (D->hasAttr<WeakAttr>()) {
- return llvm::Function::WeakAnyLinkage;
+ GV->setLinkage(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.
- return llvm::Function::AvailableExternallyLinkage;
+ GV->setLinkage(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
@@ -337,22 +341,13 @@ CodeGenModule::getFunctionLinkage(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.
- return llvm::Function::LinkOnceODRLinkage;
+ GV->setLinkage(llvm::Function::LinkOnceODRLinkage);
} else {
assert(Linkage == GVA_StrongExternal);
// Otherwise, we have strong external linkage.
- return llvm::Function::ExternalLinkage;
+ GV->setLinkage(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);
}
diff --git a/clang/lib/CodeGen/CodeGenModule.h b/clang/lib/CodeGen/CodeGenModule.h
index a5e1d9f12b3..8280766c703 100644
--- a/clang/lib/CodeGen/CodeGenModule.h
+++ b/clang/lib/CodeGen/CodeGenModule.h
@@ -206,19 +206,6 @@ public:
/// GlobalValue.
void setGlobalVisibility(llvm::GlobalValue *GV, const Decl *D) const;
- llvm::Constant *GetAddrOfGlobal(GlobalDecl GD) {
- if (isa<CXXConstructorDecl>(GD.getDecl()))
- return GetAddrOfCXXConstructor(cast<CXXConstructorDecl>(GD.getDecl()),
- GD.getCtorType());
- else if (isa<CXXDestructorDecl>(GD.getDecl()))
- return GetAddrOfCXXDestructor(cast<CXXDestructorDecl>(GD.getDecl()),
- GD.getDtorType());
- else if (isa<FunctionDecl>(GD.getDecl()))
- return GetAddrOfFunction(GD);
- else
- return GetAddrOfGlobalVar(cast<VarDecl>(GD.getDecl()));
- }
-
/// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the
/// given global variable. If Ty is non-null and if the global doesn't exist,
/// then it will be greated with the specified type instead of whatever the
@@ -304,13 +291,13 @@ public:
/// GetAddrOfCXXConstructor - Return the address of the constructor of the
/// given type.
- llvm::GlobalValue *GetAddrOfCXXConstructor(const CXXConstructorDecl *D,
- CXXCtorType Type);
+ llvm::Function *GetAddrOfCXXConstructor(const CXXConstructorDecl *D,
+ CXXCtorType Type);
/// GetAddrOfCXXDestructor - Return the address of the constructor of the
/// given type.
- llvm::GlobalValue *GetAddrOfCXXDestructor(const CXXDestructorDecl *D,
- CXXDtorType Type);
+ llvm::Function *GetAddrOfCXXDestructor(const CXXDestructorDecl *D,
+ CXXDtorType Type);
/// getBuiltinLibFunction - Given a builtin id for a function like
/// "__builtin_fabsf", return a Function* for "fabsf".
@@ -430,9 +417,6 @@ public:
GVA_TemplateInstantiation
};
- llvm::GlobalVariable::LinkageTypes
- getFunctionLinkage(const FunctionDecl *FD);
-
/// getVtableLinkage - Return the appropriate linkage for the vtable, VTT,
/// and type information of the given class.
static llvm::GlobalVariable::LinkageTypes
@@ -484,8 +468,6 @@ private:
// C++ related functions.
- bool TryEmitDefinitionAsAlias(GlobalDecl Alias, GlobalDecl Target);
-
void EmitNamespace(const NamespaceDecl *D);
void EmitLinkageSpec(const LinkageSpecDecl *D);
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