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Rename EmitStatics (etc) to EmitDeferred; provide basic infrastructure

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for attribute used support.  
- No functionality change.

llvm-svn: 64487
This commit is contained in:
Daniel Dunbar
2009-02-13 20:29:50 +00:00
parent 499ae7ec91
commit 08b26a0587
2 changed files with 61 additions and 20 deletions
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49
clang/lib/CodeGen/CodeGenModule.cpp
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@@ -60,7 +60,7 @@ CodeGenModule::~CodeGenModule() {
}
void CodeGenModule::Release() {
EmitStatics();
EmitDeferred();
EmitAliases();
if (Runtime)
if (llvm::Function *ObjCInitFunction = Runtime->ModuleInitFunction())
@@ -68,6 +68,7 @@ void CodeGenModule::Release() {
EmitCtorList(GlobalCtors, "llvm.global_ctors");
EmitCtorList(GlobalDtors, "llvm.global_dtors");
EmitAnnotations();
EmitLLVMUsed();
BindRuntimeFunctions();
}
@@ -388,16 +389,40 @@ void CodeGenModule::EmitAliases() {
}
}
void CodeGenModule::EmitStatics() {
// Emit code for each used static decl encountered. Since a previously unused
// static decl may become used during the generation of code for a static
// function, iterate until no changes are made.
void CodeGenModule::AddUsedGlobal(llvm::GlobalValue *GV) {
assert(!GV->isDeclaration() &&
"Only globals with definition can force usage.");
llvm::Type *i8PTy = llvm::PointerType::getUnqual(llvm::Type::Int8Ty);
LLVMUsed.push_back(llvm::ConstantExpr::getBitCast(GV, i8PTy));
}
void CodeGenModule::EmitLLVMUsed() {
// Don't create llvm.used if there is no need.
if (LLVMUsed.empty())
return;
llvm::ArrayType *ATy = llvm::ArrayType::get(LLVMUsed[0]->getType(),
LLVMUsed.size());
llvm::GlobalVariable *GV =
new llvm::GlobalVariable(ATy, false,
llvm::GlobalValue::AppendingLinkage,
llvm::ConstantArray::get(ATy, LLVMUsed),
"llvm.used", &getModule());
GV->setSection("llvm.metadata");
}
void CodeGenModule::EmitDeferred() {
// Emit code for any deferred decl which was used. Since a
// previously unused static decl may become used during the
// generation of code for a static function, iterate until no
// changes are made.
bool Changed;
do {
Changed = false;
for (std::list<const ValueDecl*>::iterator i = StaticDecls.begin(),
e = StaticDecls.end(); i != e; ) {
for (std::list<const ValueDecl*>::iterator i = DeferredDecls.begin(),
e = DeferredDecls.end(); i != e; ) {
const ValueDecl *D = *i;
// Check if we have used a decl with the same name
@@ -414,7 +439,7 @@ void CodeGenModule::EmitStatics() {
EmitGlobalDefinition(D);
// Erase the used decl from the list.
i = StaticDecls.erase(i);
i = DeferredDecls.erase(i);
// Remember that we made a change.
Changed = true;
@@ -481,16 +506,14 @@ void CodeGenModule::EmitGlobal(const ValueDecl *Global) {
isDef = FD->isThisDeclarationADefinition();
isStatic = FD->getStorageClass() == FunctionDecl::Static;
} else if (const VarDecl *VD = cast<VarDecl>(Global)) {
} else {
const VarDecl *VD = cast<VarDecl>(Global);
assert(VD->isFileVarDecl() && "Cannot emit local var decl as global.");
isDef = !((VD->getStorageClass() == VarDecl::Extern ||
VD->getStorageClass() == VarDecl::PrivateExtern) &&
VD->getInit() == 0);
isStatic = VD->getStorageClass() == VarDecl::Static;
} else {
assert(0 && "Invalid argument to EmitGlobal");
return;
}
// Forward declarations are emitted lazily on first use.
@@ -500,7 +523,7 @@ void CodeGenModule::EmitGlobal(const ValueDecl *Global) {
// If the global is a static, defer code generation until later so
// we can easily omit unused statics.
if (isStatic && !Features.EmitAllDecls) {
StaticDecls.push_back(Global);
DeferredDecls.push_back(Global);
return;
}