CodeGenModule.cpp

//===--- 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 "CGDebugInfo.h"
#include "CodeGenFunction.h"
#include "CodeGenTBAA.h"
#include "CGCall.h"
#include "CGCUDARuntime.h"
#include "CGCXXABI.h"
#include "CGObjCRuntime.h"
#include "CGOpenCLRuntime.h"
#include "TargetInfo.h"
#include "clang/Frontend/CodeGenOptions.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/CharUnits.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/Mangle.h"
#include "clang/AST/RecordLayout.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/Basic/Builtins.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Basic/ConvertUTF.h"
#include "llvm/CallingConv.h"
#include "llvm/Module.h"
#include "llvm/Intrinsics.h"
#include "llvm/LLVMContext.h"
#include "llvm/ADT/APSInt.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Target/Mangler.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Support/ErrorHandling.h"
using namespace clang;
using namespace CodeGen;

static const char AnnotationSection[] = "llvm.metadata";

static CGCXXABI &createCXXABI(CodeGenModule &CGM) {
  switch (CGM.getContext().getTargetInfo().getCXXABI()) {
  case CXXABI_ARM: return *CreateARMCXXABI(CGM);
  case CXXABI_Itanium: return *CreateItaniumCXXABI(CGM);
  case CXXABI_Microsoft: return *CreateMicrosoftCXXABI(CGM);
  }

  llvm_unreachable("invalid C++ ABI kind");
}


CodeGenModule::CodeGenModule(ASTContext &C, const CodeGenOptions &CGO,
                             llvm::Module &M, const llvm::TargetData &TD,
                             DiagnosticsEngine &diags)
  : Context(C), LangOpts(C.getLangOpts()), CodeGenOpts(CGO), TheModule(M),
    TheTargetData(TD), TheTargetCodeGenInfo(0), Diags(diags),
    ABI(createCXXABI(*this)), 
    Types(*this),
    TBAA(0),
    VTables(*this), ObjCRuntime(0), OpenCLRuntime(0), CUDARuntime(0),
    DebugInfo(0), ARCData(0), NoObjCARCExceptionsMetadata(0),
    RRData(0), CFConstantStringClassRef(0),
    ConstantStringClassRef(0), NSConstantStringType(0),
    VMContext(M.getContext()),
    NSConcreteGlobalBlock(0), NSConcreteStackBlock(0),
    BlockObjectAssign(0), BlockObjectDispose(0),
    BlockDescriptorType(0), GenericBlockLiteralType(0) {
      
  // Initialize the type cache.
  llvm::LLVMContext &LLVMContext = M.getContext();
  VoidTy = llvm::Type::getVoidTy(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 = C.getTargetInfo().getPointerWidth(0);
  PointerAlignInBytes =
  C.toCharUnitsFromBits(C.getTargetInfo().getPointerAlign(0)).getQuantity();
  IntTy = llvm::IntegerType::get(LLVMContext, C.getTargetInfo().getIntWidth());
  IntPtrTy = llvm::IntegerType::get(LLVMContext, PointerWidthInBits);
  Int8PtrTy = Int8Ty->getPointerTo(0);
  Int8PtrPtrTy = Int8PtrTy->getPointerTo(0);

  if (LangOpts.ObjC1)
    createObjCRuntime();
  if (LangOpts.OpenCL)
    createOpenCLRuntime();
  if (LangOpts.CUDA)
    createCUDARuntime();

  // Enable TBAA unless it's suppressed. ThreadSanitizer needs TBAA even at O0.
  if (LangOpts.ThreadSanitizer ||
      (!CodeGenOpts.RelaxedAliasing && CodeGenOpts.OptimizationLevel > 0))
    TBAA = new CodeGenTBAA(Context, VMContext, CodeGenOpts, getLangOpts(),
                           ABI.getMangleContext());

  // If debug info or coverage generation is enabled, create the CGDebugInfo
  // object.
  if (CodeGenOpts.DebugInfo != CodeGenOptions::NoDebugInfo ||
      CodeGenOpts.EmitGcovArcs ||
      CodeGenOpts.EmitGcovNotes)
    DebugInfo = new CGDebugInfo(*this);

  Block.GlobalUniqueCount = 0;

  if (C.getLangOpts().ObjCAutoRefCount)
    ARCData = new ARCEntrypoints();
  RRData = new RREntrypoints();
}

CodeGenModule::~CodeGenModule() {
  delete ObjCRuntime;
  delete OpenCLRuntime;
  delete CUDARuntime;
  delete TheTargetCodeGenInfo;
  delete &ABI;
  delete TBAA;
  delete DebugInfo;
  delete ARCData;
  delete RRData;
}

void CodeGenModule::createObjCRuntime() {
  // This is just isGNUFamily(), but we want to force implementors of
  // new ABIs to decide how best to do this.
  switch (LangOpts.ObjCRuntime.getKind()) {
  case ObjCRuntime::GNUstep:
  case ObjCRuntime::GCC:
  case ObjCRuntime::ObjFW:
    ObjCRuntime = CreateGNUObjCRuntime(*this);
    return;

  case ObjCRuntime::FragileMacOSX:
  case ObjCRuntime::MacOSX:
  case ObjCRuntime::iOS:
    ObjCRuntime = CreateMacObjCRuntime(*this);
    return;
  }
  llvm_unreachable("bad runtime kind");
}

void CodeGenModule::createOpenCLRuntime() {
  OpenCLRuntime = new CGOpenCLRuntime(*this);
}

void CodeGenModule::createCUDARuntime() {
  CUDARuntime = CreateNVCUDARuntime(*this);
}

void CodeGenModule::Release() {
  EmitDeferred();
  EmitCXXGlobalInitFunc();
  EmitCXXGlobalDtorFunc();
  if (ObjCRuntime)
    if (llvm::Function *ObjCInitFunction = ObjCRuntime->ModuleInitFunction())
      AddGlobalCtor(ObjCInitFunction);
  EmitCtorList(GlobalCtors, "llvm.global_ctors");
  EmitCtorList(GlobalDtors, "llvm.global_dtors");
  EmitGlobalAnnotations();
  EmitLLVMUsed();

  SimplifyPersonality();

  if (getCodeGenOpts().EmitDeclMetadata)
    EmitDeclMetadata();

  if (getCodeGenOpts().EmitGcovArcs || getCodeGenOpts().EmitGcovNotes)
    EmitCoverageFile();

  if (DebugInfo)
    DebugInfo->finalize();
}

void CodeGenModule::UpdateCompletedType(const TagDecl *TD) {
  // Make sure that this type is translated.
  Types.UpdateCompletedType(TD);
}

llvm::MDNode *CodeGenModule::getTBAAInfo(QualType QTy) {
  if (!TBAA)
    return 0;
  return TBAA->getTBAAInfo(QTy);
}

llvm::MDNode *CodeGenModule::getTBAAInfoForVTablePtr() {
  if (!TBAA)