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//===--- CodeGenModule.cpp - Emit LLVM Code from ASTs for a Module --------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This coordinates the per-module state used while generating code.
//
//===----------------------------------------------------------------------===//
#include "CodeGenModule.h"
#include "CodeGenFunction.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Decl.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/GlobalVariable.h"
#include "llvm/Intrinsics.h"
using namespace clang;
using namespace CodeGen;
CodeGenModule::CodeGenModule(ASTContext &C, llvm::Module &M)
: Context(C), TheModule(M), Types(C.Target) {}
llvm::Constant *CodeGenModule::GetAddrOfGlobalDecl(const Decl *D) {
// See if it is already in the map.
llvm::Constant *&Entry = GlobalDeclMap[D];
if (Entry) return Entry;
QualType ASTTy = cast<ValueDecl>(D)->getType();
const llvm::Type *Ty = getTypes().ConvertType(ASTTy);
if (isa<FunctionDecl>(D)) {
const llvm::FunctionType *FTy = cast<llvm::FunctionType>(Ty);
// FIXME: param attributes for sext/zext etc.
return Entry = new llvm::Function(FTy, llvm::Function::ExternalLinkage,
D->getName(), &getModule());
}
assert(isa<FileVarDecl>(D) && "Unknown global decl!");
return Entry = new llvm::GlobalVariable(Ty, false,
llvm::GlobalValue::ExternalLinkage,
0, D->getName(), &getModule());
}
void CodeGenModule::EmitFunction(const FunctionDecl *FD) {
// If this is not a prototype, emit the body.
if (FD->getBody())
CodeGenFunction(*this).GenerateCode(FD);
}
void CodeGenModule::EmitGlobalVar(const FileVarDecl *D) {
llvm::GlobalVariable *GV = cast<llvm::GlobalVariable>(GetAddrOfGlobalDecl(D));
// If the storage class is external and there is no initializer, just leave it
// as a declaration.
if (D->getStorageClass() == VarDecl::Extern && D->getInit() == 0)
return;
// Otherwise, convert the initializer, or use zero if appropriate.
llvm::Constant *Init;
if (D->getInit() == 0)
Init = llvm::Constant::getNullValue(GV->getType()->getElementType());
else
assert(D->getInit() == 0 && "FIXME: Global variable initializers unimp!");
GV->setInitializer(Init);
// Set the llvm linkage type as appropriate.
// FIXME: This isn't right. This should handle common linkage and other
// stuff.
switch (D->getStorageClass()) {
case VarDecl::Auto:
case VarDecl::Register:
assert(0 && "Can't have auto or register globals");
case VarDecl::None:
case VarDecl::Extern:
// todo: common
break;
case VarDecl::Static:
GV->setLinkage(llvm::GlobalVariable::InternalLinkage);
break;
}
}
llvm::Function *CodeGenModule::getMemCpyFn() {
if (MemCpyFn) return MemCpyFn;
llvm::Intrinsic::ID IID;
switch (Context.Target.getPointerWidth(SourceLocation())) {
default: assert(0 && "Unknown ptr width");
case 32: IID = llvm::Intrinsic::memcpy_i32; break;
case 64: IID = llvm::Intrinsic::memcpy_i64; break;
}
return MemCpyFn = llvm::Intrinsic::getDeclaration(&TheModule, IID);
}
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