C++ IRGenerator::getClangDataLayout方法代码示例

IRGenModule::IRGenModule(IRGenerator &irgen,
                         std::unique_ptr<llvm::TargetMachine> &&target,
                         SourceFile *SF, llvm::LLVMContext &LLVMContext,
                         StringRef ModuleName, StringRef OutputFilename,
                         StringRef MainInputFilenameForDebugInfo)
    : IRGen(irgen), Context(irgen.SIL.getASTContext()),
      ClangCodeGen(createClangCodeGenerator(Context, LLVMContext, irgen.Opts,
                                            ModuleName)),
      Module(*ClangCodeGen->GetModule()), LLVMContext(Module.getContext()),
      DataLayout(irgen.getClangDataLayout()),
      Triple(irgen.getEffectiveClangTriple()), TargetMachine(std::move(target)),
      silConv(irgen.SIL), OutputFilename(OutputFilename),
      MainInputFilenameForDebugInfo(MainInputFilenameForDebugInfo),
      TargetInfo(SwiftTargetInfo::get(*this)), DebugInfo(nullptr),
      ModuleHash(nullptr), ObjCInterop(Context.LangOpts.EnableObjCInterop),
      UseDarwinPreStableABIBit(Context.LangOpts.UseDarwinPreStableABIBit),
      Types(*new TypeConverter(*this)) {
  irgen.addGenModule(SF, this);

  auto &opts = irgen.Opts;

  EnableValueNames = opts.shouldProvideValueNames();
  
  VoidTy = llvm::Type::getVoidTy(getLLVMContext());
  Int1Ty = llvm::Type::getInt1Ty(getLLVMContext());
  Int8Ty = llvm::Type::getInt8Ty(getLLVMContext());
  Int16Ty = llvm::Type::getInt16Ty(getLLVMContext());
  Int32Ty = llvm::Type::getInt32Ty(getLLVMContext());
  Int32PtrTy = Int32Ty->getPointerTo();
  Int64Ty = llvm::Type::getInt64Ty(getLLVMContext());
  Int8PtrTy = llvm::Type::getInt8PtrTy(getLLVMContext());
  Int8PtrPtrTy = Int8PtrTy->getPointerTo(0);
  SizeTy = DataLayout.getIntPtrType(getLLVMContext(), /*addrspace*/ 0);

  // For the relative address type, we want to use the int32 bit type
  // on most architectures, e.g. x86_64, because it produces valid
  // fixups/relocations. The exception is 16-bit architectures,
  // so we shorten the relative address type there.
  if (SizeTy->getBitWidth()<32) {
    RelativeAddressTy = SizeTy;
  } else {
    RelativeAddressTy = Int32Ty;
  }

  RelativeAddressPtrTy = RelativeAddressTy->getPointerTo();

  FloatTy = llvm::Type::getFloatTy(getLLVMContext());
  DoubleTy = llvm::Type::getDoubleTy(getLLVMContext());

  auto CI = static_cast<ClangImporter*>(&*Context.getClangModuleLoader());
  assert(CI && "no clang module loader");
  auto &clangASTContext = CI->getClangASTContext();

  ObjCBoolTy = Int1Ty;
  if (clangASTContext.getTargetInfo().useSignedCharForObjCBool())
    ObjCBoolTy = Int8Ty;

  RefCountedStructTy =
    llvm::StructType::create(getLLVMContext(), "swift.refcounted");
  RefCountedPtrTy = RefCountedStructTy->getPointerTo(/*addrspace*/ 0);
  RefCountedNull = llvm::ConstantPointerNull::get(RefCountedPtrTy);

  // For now, references storage types are just pointers.
#define CHECKED_REF_STORAGE(Name, name, ...) \
  Name##ReferencePtrTy = \
    createStructPointerType(*this, "swift." #name, { RefCountedPtrTy });
#include "swift/AST/ReferenceStorage.def"

  // A type metadata record is the structure pointed to by the canonical
  // address point of a type metadata.  This is at least one word, and
  // potentially more than that, past the start of the actual global
  // structure.
  TypeMetadataStructTy = createStructType(*this, "swift.type", {
    MetadataKindTy          // MetadataKind Kind;
  });
  TypeMetadataPtrTy = TypeMetadataStructTy->getPointerTo(DefaultAS);

  TypeMetadataResponseTy = createStructType(*this, "swift.metadata_response", {
    TypeMetadataPtrTy,
    SizeTy
  });

  OffsetPairTy = llvm::StructType::get(getLLVMContext(), { SizeTy, SizeTy });

  // The TypeLayout structure, including all possible trailing components.
  FullTypeLayoutTy = createStructType(*this, "swift.full_type_layout", {
    SizeTy, // size
    SizeTy, // flags
    SizeTy, // alignment
    SizeTy  // extra inhabitant flags (optional)
  });

  // A protocol descriptor describes a protocol. It is not type metadata in
  // and of itself, but is referenced in the structure of existential type
  // metadata records.
  ProtocolDescriptorStructTy = createStructType(*this, "swift.protocol", {
    Int8PtrTy,              // objc isa
    Int8PtrTy,              // name
    Int8PtrTy,              // inherited protocols
    Int8PtrTy,              // required objc instance methods
//.........这里部分代码省略.........