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//===--- CodeGenModule.cpp - Emit LLVM Code from ASTs for a Module --------===//
//
// The LLVM Compiler Infrastructure
//
// This file 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 "CGIORuntime.h"
#include "CGSystemRuntime.h"
#include "flang/AST/ASTContext.h"
#include "flang/AST/Decl.h"
#include "flang/AST/DeclVisitor.h"
#include "flang/Basic/Diagnostic.h"
#include "flang/Frontend/CodeGenOptions.h"
#include "llvm/ADT/APSInt.h"
#include "llvm/ADT/Triple.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/CallSite.h"
#include "llvm/Support/ConvertUTF.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/IR/Mangler.h"
namespace flang {
namespace CodeGen {
CodeGenModule::CodeGenModule(ASTContext &C, const CodeGenOptions &CGO,
llvm::Module &M, const llvm::DataLayout &TD,
DiagnosticsEngine &diags)
: Context(C), LangOpts(C.getLangOpts()), CodeGenOpts(CGO), TheModule(M),
Diags(diags), TheDataLayout(TD), VMContext(M.getContext()), Types(*this),
TheTargetCodeGenInfo(nullptr) {
llvm::LLVMContext &LLVMContext = M.getContext();
VoidTy = llvm::Type::getVoidTy(LLVMContext);
Int1Ty = llvm::Type::getInt1Ty(LLVMContext);
Int8Ty = llvm::Type::getInt8Ty(LLVMContext);
Int16Ty = llvm::Type::getInt16Ty(LLVMContext);
Int32Ty = llvm::Type::getInt32Ty(LLVMContext);
Int64Ty = llvm::Type::getInt64Ty(LLVMContext);
FloatTy = llvm::Type::getFloatTy(LLVMContext);
DoubleTy = llvm::Type::getDoubleTy(LLVMContext);
PointerWidthInBits = TD.getPointerSizeInBits(0);
IntPtrTy = llvm::IntegerType::get(LLVMContext, PointerWidthInBits);
Int8PtrTy = Int8Ty->getPointerTo(0);
Int8PtrPtrTy = Int8PtrTy->getPointerTo(0);
RuntimeCC = llvm::CallingConv::C;
IORuntime = CreateLibflangIORuntime(*this);
SystemRuntime = CreateLibflangSystemRuntime(*this);
}
CodeGenModule::~CodeGenModule() {
if(IORuntime)
delete IORuntime;
}
void CodeGenModule::Release() {
}
llvm::Value*
CodeGenModule::GetCFunction(StringRef Name,
ArrayRef<llvm::Type*> ArgTypes,
llvm::Type *ReturnType) {
if(auto Func = TheModule.getFunction(Name))
return Func;
auto FType = llvm::FunctionType::get(ReturnType? ReturnType :
VoidTy, ArgTypes,
false);
auto Func = llvm::Function::Create(FType, llvm::GlobalValue::ExternalLinkage,
Name, &TheModule);
Func->setCallingConv(llvm::CallingConv::C);
return Func;
}
llvm::Value *
CodeGenModule::GetRuntimeFunction(StringRef Name,
ArrayRef<llvm::Type*> ArgTypes,
llvm::Type *ReturnType) {
llvm::SmallString<32> MangledName("libflang_");
MangledName.append(Name);
return GetCFunction(MangledName, ArgTypes, ReturnType);
}
CGFunction
CodeGenModule::GetRuntimeFunction(StringRef Name,
ArrayRef<CGType> ArgTypes,
CGType ReturnType,
FortranABI *ABI) {
llvm::SmallString<32> MangledName("libflang_");
MangledName.append(Name);
auto SearchResult = RuntimeFunctions.find(MangledName);
if(SearchResult != RuntimeFunctions.end())
return SearchResult->second;
auto FunctionInfo = Types.GetFunctionType(ABI? *ABI : RuntimeABI,
ArgTypes,
ReturnType);
auto Func = llvm::Function::Create(FunctionInfo->getFunctionType(),
llvm::GlobalValue::ExternalLinkage,
llvm::Twine(MangledName), &TheModule);
Func->setCallingConv(FunctionInfo->getCallingConv());
auto Result = CGFunction(FunctionInfo, Func);
RuntimeFunctions[MangledName] = Result;
return Result;
}
CGFunction CodeGenModule::GetFunction(const FunctionDecl *Function) {
auto SearchResult = Functions.find(Function);
if(SearchResult != Functions.end())
return SearchResult->second;
auto FunctionInfo = Types.GetFunctionType(Function);
auto Func = llvm::Function::Create(FunctionInfo->getFunctionType(),
llvm::GlobalValue::ExternalLinkage,
llvm::Twine(Function->getName()) + "_",
&TheModule);
Func->setCallingConv(FunctionInfo->getCallingConv());
auto Result = CGFunction(FunctionInfo, Func);
Functions.insert(std::make_pair(Function, Result));
return Result;
}
void CodeGenModule::EmitTopLevelDecl(const Decl *Declaration) {
class Visitor : public ConstDeclVisitor<Visitor> {
public:
CodeGenModule *CG;
Visitor(CodeGenModule *P) : CG(P) {}
void VisitMainProgramDecl(const MainProgramDecl *D) {
CG->EmitMainProgramDecl(D);
}
void VisitFunctionDecl(const FunctionDecl *D) {
CG->EmitFunctionDecl(D);
}
};
Visitor DV(this);
DV.Visit(Declaration);
}
void CodeGenModule::EmitMainProgramDecl(const MainProgramDecl *Program) {
auto FType = llvm::FunctionType::get(Int32Ty, false);
auto Linkage = llvm::GlobalValue::ExternalLinkage;
auto Func = llvm::Function::Create(FType, Linkage, "main", &TheModule);
Func->setCallingConv(llvm::CallingConv::C);
CodeGenFunction CGF(*this, Func);
CGF.EmitMainProgramBody(Program, Program->getBody());
}
void CodeGenModule::EmitFunctionDecl(const FunctionDecl *Function) {
auto FuncInfo = GetFunction(Function);
CodeGenFunction CGF(*this, FuncInfo.getFunction());
CGF.EmitFunctionArguments(Function, FuncInfo.getInfo());
CGF.EmitFunctionPrologue(Function, FuncInfo.getInfo());
CGF.EmitFunctionBody(Function, Function->getBody());
CGF.EmitFunctionEpilogue(Function, FuncInfo.getInfo());
}
llvm::GlobalVariable *CodeGenModule::EmitGlobalVariable(StringRef FuncName, const VarDecl *Var,
llvm::Constant *Initializer) {
auto T = getTypes().ConvertTypeForMem(Var->getType());
return new llvm::GlobalVariable(TheModule, T,
false, llvm::GlobalValue::InternalLinkage,
llvm::Constant::getNullValue(T),
llvm::Twine(FuncName) + Var->getName() + "_");
}
llvm::GlobalVariable *CodeGenModule::EmitGlobalVariable(StringRef FuncName, StringRef VarName,
llvm::Type *Type, llvm::Constant *Initializer) {
return new llvm::GlobalVariable(TheModule, Type,
false, llvm::GlobalValue::InternalLinkage, Initializer,
llvm::Twine(FuncName) + VarName + "_");
}
llvm::Value *CodeGenModule::EmitConstantArray(llvm::Constant *Array) {
// FIXME: fold identical values
return new llvm::GlobalVariable(TheModule, Array->getType(),
true, llvm::GlobalValue::PrivateLinkage, Array);
}
llvm::Value *CodeGenModule::EmitCommonBlock(const CommonBlockDecl *CB,
llvm::Type *Type,
llvm::Constant *Initializer) {
llvm::SmallString<32> Name;
StringRef NameRef;
if(CB->getIdentifier()) {
Name.append(CB->getName());
Name.push_back('_');
NameRef = Name;
} else
NameRef = "__BLNK__"; // FIXME?
auto Var = TheModule.getGlobalVariable(NameRef);
if(Var)
return Var;
if(!Initializer)
Initializer = llvm::Constant::getNullValue(Type);
auto CBVar = new llvm::GlobalVariable(TheModule, Type,
false, llvm::GlobalValue::CommonLinkage,
Initializer, NameRef);
CBVar->setAlignment(16); // FIXME: proper target dependent alignment value
return CBVar;
}
}
} // end namespace flang
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