Exemplo n.º 1
0
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
    Int8PtrTy,              // required objc class methods
    Int8PtrTy,              // optional objc instance methods
    Int8PtrTy,              // optional objc class methods
    Int8PtrTy,              // objc properties
    Int32Ty,                // size
    Int32Ty,                // flags
    Int32Ty,                // total requirement count
    Int32Ty,                // requirements array
    RelativeAddressTy,      // superclass
    RelativeAddressTy       // associated type names
  });
  
  ProtocolDescriptorPtrTy = ProtocolDescriptorStructTy->getPointerTo();

  ProtocolRequirementStructTy =
      createStructType(*this, "swift.protocol_requirement", {
    Int32Ty,                // flags
    RelativeAddressTy,      // default implementation
  });
  
  // A tuple type metadata record has a couple extra fields.
  auto tupleElementTy = createStructType(*this, "swift.tuple_element_type", {
    TypeMetadataPtrTy,      // Metadata *Type;
    SizeTy                  // size_t Offset;
  });
  TupleTypeMetadataPtrTy = createStructPointerType(*this, "swift.tuple_type", {
    TypeMetadataStructTy,   // (base)
    SizeTy,                 // size_t NumElements;
    Int8PtrTy,              // const char *Labels;
    llvm::ArrayType::get(tupleElementTy, 0) // Element Elements[];
  });

  // A full type metadata record is basically just an adjustment to the
  // address point of a type metadata.  Resilience may cause
  // additional data to be laid out prior to this address point.
  FullTypeMetadataStructTy = createStructType(*this, "swift.full_type", {
    WitnessTablePtrTy,
    TypeMetadataStructTy
  });
  FullTypeMetadataPtrTy = FullTypeMetadataStructTy->getPointerTo(DefaultAS);

  DeallocatingDtorTy = llvm::FunctionType::get(VoidTy, RefCountedPtrTy, false);
  llvm::Type *dtorPtrTy = DeallocatingDtorTy->getPointerTo();

  // A full heap metadata is basically just an additional small prefix
  // on a full metadata, used for metadata corresponding to heap
  // allocations.
  FullHeapMetadataStructTy =
                  createStructType(*this, "swift.full_heapmetadata", {
    dtorPtrTy,
    WitnessTablePtrTy,
    TypeMetadataStructTy
  });
  FullHeapMetadataPtrTy = FullHeapMetadataStructTy->getPointerTo(DefaultAS);

  // A full box metadata is non-type heap metadata for a heap allocation of a
  // single value. The box tracks the offset to the value inside the box.
  FullBoxMetadataStructTy =
                  createStructType(*this, "swift.full_boxmetadata", {
    dtorPtrTy,
    WitnessTablePtrTy,
    TypeMetadataStructTy,
    Int32Ty,
    CaptureDescriptorPtrTy,
  });
  FullBoxMetadataPtrTy = FullBoxMetadataStructTy->getPointerTo(DefaultAS);

  // This must match struct HeapObject in the runtime.
  llvm::Type *refCountedElts[] = {TypeMetadataPtrTy, IntPtrTy};
  RefCountedStructTy->setBody(refCountedElts);
  RefCountedStructSize =
    Size(DataLayout.getStructLayout(RefCountedStructTy)->getSizeInBytes());

  PtrSize = Size(DataLayout.getPointerSize(DefaultAS));

  FunctionPairTy = createStructType(*this, "swift.function", {
    FunctionPtrTy,
    RefCountedPtrTy,
  });

  OpaqueTy = llvm::StructType::create(LLVMContext, "swift.opaque");
  OpaquePtrTy = OpaqueTy->getPointerTo(DefaultAS);
  NoEscapeFunctionPairTy = createStructType(*this, "swift.noescape.function", {
    FunctionPtrTy,
    OpaquePtrTy,
  });

  ProtocolRecordTy =
    createStructType(*this, "swift.protocolref", {
      RelativeAddressTy
    });
  ProtocolRecordPtrTy = ProtocolRecordTy->getPointerTo();

  ProtocolConformanceDescriptorTy
    = createStructType(*this, "swift.protocol_conformance_descriptor", {
      RelativeAddressTy,
      RelativeAddressTy,
      RelativeAddressTy,
      Int32Ty
    });
  ProtocolConformanceDescriptorPtrTy
    = ProtocolConformanceDescriptorTy->getPointerTo(DefaultAS);

  TypeContextDescriptorTy
    = llvm::StructType::create(LLVMContext, "swift.type_descriptor");
  TypeContextDescriptorPtrTy
    = TypeContextDescriptorTy->getPointerTo(DefaultAS);

  ClassContextDescriptorTy =
        llvm::StructType::get(LLVMContext, {
    Int32Ty, // context flags
    Int32Ty, // parent
    Int32Ty, // name
    Int32Ty, // kind
    Int32Ty, // accessor function
    Int32Ty, // num fields
    Int32Ty, // field offset vector
    Int32Ty, // is_reflectable flag
    Int32Ty, // (Generics Descriptor) argument offset
    Int32Ty, // (Generics Descriptor) num params
    Int32Ty, // (Generics Descriptor) num requirements
    Int32Ty, // (Generics Descriptor) num key arguments
    Int32Ty, // (Generics Descriptor) num extra arguments
    Int32Ty, // (VTable Descriptor) offset
    Int32Ty, // (VTable Descriptor) size
    Int32Ty, // (Methods Descriptor) accessor
    Int32Ty, // (Methods Descriptor) flags
  }, /*packed=*/true);

  MethodDescriptorStructTy
    = createStructType(*this, "swift.method_descriptor", {
      Int32Ty,
      RelativeAddressTy,
    });

  MethodOverrideDescriptorStructTy
    = createStructType(*this, "swift.method_override_descriptor", {
      RelativeAddressTy,
      RelativeAddressTy,
      RelativeAddressTy
    });

  TypeMetadataRecordTy
    = createStructType(*this, "swift.type_metadata_record", {
      RelativeAddressTy
    });
  TypeMetadataRecordPtrTy
    = TypeMetadataRecordTy->getPointerTo(DefaultAS);

  FieldDescriptorTy
    = llvm::StructType::create(LLVMContext, "swift.field_descriptor");
  FieldDescriptorPtrTy = FieldDescriptorTy->getPointerTo(DefaultAS);
  FieldDescriptorPtrPtrTy = FieldDescriptorPtrTy->getPointerTo(DefaultAS);

  FixedBufferTy = nullptr;
  for (unsigned i = 0; i != MaxNumValueWitnesses; ++i)
    ValueWitnessTys[i] = nullptr;

  ObjCPtrTy = llvm::StructType::create(getLLVMContext(), "objc_object")
                ->getPointerTo(DefaultAS);
  BridgeObjectPtrTy = llvm::StructType::create(getLLVMContext(), "swift.bridge")
                ->getPointerTo(DefaultAS);

  ObjCClassStructTy = llvm::StructType::create(LLVMContext, "objc_class");
  ObjCClassPtrTy = ObjCClassStructTy->getPointerTo(DefaultAS);
  llvm::Type *objcClassElts[] = {
    ObjCClassPtrTy,
    ObjCClassPtrTy,
    OpaquePtrTy,
    OpaquePtrTy,
    IntPtrTy
  };
  ObjCClassStructTy->setBody(objcClassElts);

  ObjCSuperStructTy = llvm::StructType::create(LLVMContext, "objc_super");
  ObjCSuperPtrTy = ObjCSuperStructTy->getPointerTo(DefaultAS);
  llvm::Type *objcSuperElts[] = {
    ObjCPtrTy,
    ObjCClassPtrTy
  };
  ObjCSuperStructTy->setBody(objcSuperElts);
  
  ObjCBlockStructTy = llvm::StructType::create(LLVMContext, "objc_block");
  ObjCBlockPtrTy = ObjCBlockStructTy->getPointerTo(DefaultAS);
  llvm::Type *objcBlockElts[] = {
    ObjCClassPtrTy, // isa
    Int32Ty,        // flags
    Int32Ty,        // reserved
    FunctionPtrTy,  // invoke function pointer
    Int8PtrTy,      // TODO: block descriptor pointer.
                    // We will probably need a struct type for that at some
                    // point too.
  };
  ObjCBlockStructTy->setBody(objcBlockElts);
  
  auto ErrorStructTy = llvm::StructType::create(LLVMContext, "swift.error");
  // ErrorStruct is currently opaque to the compiler.
  ErrorPtrTy = ErrorStructTy->getPointerTo(DefaultAS);
  
  llvm::Type *openedErrorTriple[] = {
    OpaquePtrTy,
    TypeMetadataPtrTy,
    WitnessTablePtrTy,
  };
  OpenedErrorTripleTy = llvm::StructType::get(getLLVMContext(),
                                              openedErrorTriple,
                                              /*packed*/ false);
  OpenedErrorTriplePtrTy = OpenedErrorTripleTy->getPointerTo(DefaultAS);

  WitnessTablePtrPtrTy = WitnessTablePtrTy->getPointerTo(DefaultAS);

  InvariantMetadataID = LLVMContext.getMDKindID("invariant.load");
  InvariantNode = llvm::MDNode::get(LLVMContext, {});
  DereferenceableID = LLVMContext.getMDKindID("dereferenceable");
  
  C_CC = llvm::CallingConv::C;
  // TODO: use "tinycc" on platforms that support it
  DefaultCC = SWIFT_DEFAULT_LLVM_CC;
  SwiftCC = llvm::CallingConv::Swift;

  if (opts.DebugInfoLevel > IRGenDebugInfoLevel::None)
    DebugInfo = IRGenDebugInfo::createIRGenDebugInfo(IRGen.Opts, *CI, *this,
                                                     Module,
                                                 MainInputFilenameForDebugInfo);

  initClangTypeConverter();

  if (ClangASTContext) {
    auto atomicBoolTy = ClangASTContext->getAtomicType(ClangASTContext->BoolTy);
    AtomicBoolSize = Size(ClangASTContext->getTypeSize(atomicBoolTy));
    AtomicBoolAlign = Alignment(ClangASTContext->getTypeSize(atomicBoolTy));
  }

  IsSwiftErrorInRegister =
    clang::CodeGen::swiftcall::isSwiftErrorLoweredInRegister(
      ClangCodeGen->CGM());

  DynamicReplacementsTy =
      llvm::StructType::get(getLLVMContext(), {Int8PtrPtrTy, Int8PtrTy});
  DynamicReplacementsPtrTy = DynamicReplacementsTy->getPointerTo(DefaultAS);

  DynamicReplacementLinkEntryTy =
      llvm::StructType::create(getLLVMContext(), "swift.dyn_repl_link_entry");
  DynamicReplacementLinkEntryPtrTy =
      DynamicReplacementLinkEntryTy->getPointerTo(DefaultAS);
  llvm::Type *linkEntryFields[] = {
    Int8PtrTy, // function pointer.
    DynamicReplacementLinkEntryPtrTy // next.
  };
  DynamicReplacementLinkEntryTy->setBody(linkEntryFields);

  DynamicReplacementKeyTy = createStructType(*this, "swift.dyn_repl_key",
                                             {RelativeAddressTy, Int32Ty});
}
Exemplo n.º 2
0
IRGenModule::IRGenModule(IRGenModuleDispatcher &dispatcher, SourceFile *SF,
                         ASTContext &Context,
                         llvm::LLVMContext &LLVMContext,
                         IRGenOptions &Opts, StringRef ModuleName,
                         const llvm::DataLayout &DataLayout,
                         const llvm::Triple &Triple,
                         llvm::TargetMachine *TargetMachine,
                         SILModule *SILMod,
                         StringRef OutputFilename)
  : Context(Context), Opts(Opts),
    ClangCodeGen(createClangCodeGenerator(Context, LLVMContext, Opts, ModuleName)),
    Module(*ClangCodeGen->GetModule()),
    LLVMContext(Module.getContext()), DataLayout(DataLayout),
    Triple(Triple), TargetMachine(TargetMachine),
    SILMod(SILMod), OutputFilename(OutputFilename), dispatcher(dispatcher),
    TargetInfo(SwiftTargetInfo::get(*this)),
    DebugInfo(0), ModuleHash(nullptr),
    ObjCInterop(Context.LangOpts.EnableObjCInterop),
    Types(*new TypeConverter(*this))
{
  dispatcher.addGenModule(SF, this);

  // If the command line contains an explicit request about whether to add
  // LLVM value names, honor it.  Otherwise, add value names only if the
  // final result is textual LLVM assembly.
  if (Opts.HasValueNamesSetting) {
    EnableValueNames = Opts.ValueNames;
  } else {
    EnableValueNames = (Opts.OutputKind == IRGenOutputKind::LLVMAssembly);
  }
  
  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());
  Int64Ty = llvm::Type::getInt64Ty(getLLVMContext());
  Int8PtrTy = llvm::Type::getInt8PtrTy(getLLVMContext());
  Int8PtrPtrTy = Int8PtrTy->getPointerTo(0);
  SizeTy = DataLayout.getIntPtrType(getLLVMContext(), /*addrspace*/ 0);

  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, native weak references are just a pointer.
  WeakReferencePtrTy =
    createStructPointerType(*this, "swift.weak", { RefCountedPtrTy });

  // Native unowned references are just a pointer.
  UnownedReferencePtrTy =
    createStructPointerType(*this, "swift.unowned", { RefCountedPtrTy });

  // 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);

  // 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
    Int8PtrTy,              // required objc class methods
    Int8PtrTy,              // optional objc instance methods
    Int8PtrTy,              // optional objc class methods
    Int8PtrTy,              // objc properties
    Int32Ty,                // size
    Int32Ty,                // flags
    Int16Ty,                // minimum witness count
    Int16Ty                 // default witness count
  });
  
  ProtocolDescriptorPtrTy = ProtocolDescriptorStructTy->getPointerTo();
  
  // A tuple type metadata record has a couple extra fields.
  auto tupleElementTy = createStructType(*this, "swift.tuple_element_type", {
    TypeMetadataPtrTy,      // Metadata *Type;
    SizeTy                  // size_t Offset;
  });
  TupleTypeMetadataPtrTy = createStructPointerType(*this, "swift.tuple_type", {
    TypeMetadataStructTy,   // (base)
    SizeTy,                 // size_t NumElements;
    Int8PtrTy,              // const char *Labels;
    llvm::ArrayType::get(tupleElementTy, 0) // Element Elements[];
  });

  // A full type metadata record is basically just an adjustment to the
  // address point of a type metadata.  Resilience may cause
  // additional data to be laid out prior to this address point.
  FullTypeMetadataStructTy = createStructType(*this, "swift.full_type", {
    WitnessTablePtrTy,
    TypeMetadataStructTy
  });
  FullTypeMetadataPtrTy = FullTypeMetadataStructTy->getPointerTo(DefaultAS);

  // A metadata pattern is a structure from which generic type
  // metadata are allocated.  We leave this struct type intentionally
  // opaque, because the compiler basically never needs to access
  // anything from one.
  TypeMetadataPatternStructTy =
    llvm::StructType::create(getLLVMContext(), "swift.type_pattern");
  TypeMetadataPatternPtrTy =
    TypeMetadataPatternStructTy->getPointerTo(DefaultAS);

  DeallocatingDtorTy = llvm::FunctionType::get(VoidTy, RefCountedPtrTy, false);
  llvm::Type *dtorPtrTy = DeallocatingDtorTy->getPointerTo();

  // A full heap metadata is basically just an additional small prefix
  // on a full metadata, used for metadata corresponding to heap
  // allocations.
  FullHeapMetadataStructTy =
                  createStructType(*this, "swift.full_heapmetadata", {
    dtorPtrTy,
    WitnessTablePtrTy,
    TypeMetadataStructTy
  });
  FullHeapMetadataPtrTy = FullHeapMetadataStructTy->getPointerTo(DefaultAS);

  // A full box metadata is non-type heap metadata for a heap allocation of a
  // single value. The box tracks the offset to the value inside the box.
  FullBoxMetadataStructTy =
                  createStructType(*this, "swift.full_boxmetadata", {
    dtorPtrTy,
    WitnessTablePtrTy,
    TypeMetadataStructTy,
    Int32Ty,
  });
  FullBoxMetadataPtrTy = FullBoxMetadataStructTy->getPointerTo(DefaultAS);


  llvm::Type *refCountedElts[] = { TypeMetadataPtrTy, Int32Ty, Int32Ty };
  RefCountedStructTy->setBody(refCountedElts);

  PtrSize = Size(DataLayout.getPointerSize(DefaultAS));

  FunctionPairTy = createStructType(*this, "swift.function", {
    FunctionPtrTy,
    RefCountedPtrTy,
  });
  
  OpaquePtrTy = llvm::StructType::create(LLVMContext, "swift.opaque")
                  ->getPointerTo(DefaultAS);

  ProtocolConformanceRecordTy
    = createStructType(*this, "swift.protocol_conformance", {
      RelativeAddressTy,
      RelativeAddressTy,
      RelativeAddressTy,
      Int32Ty
    });
  ProtocolConformanceRecordPtrTy
    = ProtocolConformanceRecordTy->getPointerTo(DefaultAS);

  NominalTypeDescriptorTy
    = llvm::StructType::create(LLVMContext, "swift.type_descriptor");
  NominalTypeDescriptorPtrTy
    = NominalTypeDescriptorTy->getPointerTo(DefaultAS);

  TypeMetadataRecordTy
    = createStructType(*this, "swift.type_metadata_record", {
      RelativeAddressTy,
      Int32Ty
    });
  TypeMetadataRecordPtrTy
    = TypeMetadataRecordTy->getPointerTo(DefaultAS);

  FieldDescriptorTy
    = llvm::StructType::create(LLVMContext, "swift.field_descriptor");
  FieldDescriptorPtrTy = FieldDescriptorTy->getPointerTo(DefaultAS);

  FixedBufferTy = nullptr;
  for (unsigned i = 0; i != MaxNumValueWitnesses; ++i)
    ValueWitnessTys[i] = nullptr;

  ObjCPtrTy = llvm::StructType::create(getLLVMContext(), "objc_object")
                ->getPointerTo(DefaultAS);
  BridgeObjectPtrTy = llvm::StructType::create(getLLVMContext(), "swift.bridge")
                ->getPointerTo(DefaultAS);

  ObjCClassStructTy = llvm::StructType::create(LLVMContext, "objc_class");
  ObjCClassPtrTy = ObjCClassStructTy->getPointerTo(DefaultAS);
  llvm::Type *objcClassElts[] = {
    ObjCClassPtrTy,
    ObjCClassPtrTy,
    OpaquePtrTy,
    OpaquePtrTy,
    IntPtrTy
  };
  ObjCClassStructTy->setBody(objcClassElts);

  ObjCSuperStructTy = llvm::StructType::create(LLVMContext, "objc_super");
  ObjCSuperPtrTy = ObjCSuperStructTy->getPointerTo(DefaultAS);
  llvm::Type *objcSuperElts[] = {
    ObjCPtrTy,
    ObjCClassPtrTy
  };
  ObjCSuperStructTy->setBody(objcSuperElts);
  
  ObjCBlockStructTy = llvm::StructType::create(LLVMContext, "objc_block");
  ObjCBlockPtrTy = ObjCBlockStructTy->getPointerTo(DefaultAS);
  llvm::Type *objcBlockElts[] = {
    ObjCClassPtrTy, // isa
    Int32Ty,        // flags
    Int32Ty,        // reserved
    FunctionPtrTy,  // invoke function pointer
    Int8PtrTy,      // TODO: block descriptor pointer.
                    // We will probably need a struct type for that at some
                    // point too.
  };
  ObjCBlockStructTy->setBody(objcBlockElts);
  
  auto ErrorStructTy = llvm::StructType::create(LLVMContext, "swift.error");
  // ErrorStruct is currently opaque to the compiler.
  ErrorPtrTy = ErrorStructTy->getPointerTo(DefaultAS);
  
  llvm::Type *openedErrorTriple[] = {
    OpaquePtrTy,
    TypeMetadataPtrTy,
    WitnessTablePtrTy,
  };
  OpenedErrorTripleTy = llvm::StructType::get(getLLVMContext(),
                                              openedErrorTriple,
                                              /*packed*/ false);
  OpenedErrorTriplePtrTy = OpenedErrorTripleTy->getPointerTo(DefaultAS);
  
  InvariantMetadataID = LLVMContext.getMDKindID("invariant.load");
  InvariantNode = llvm::MDNode::get(LLVMContext, {});
  DereferenceableID = LLVMContext.getMDKindID("dereferenceable");
  
  // TODO: use "tinycc" on platforms that support it
  RuntimeCC = llvm::CallingConv::C;

  ABITypes = new CodeGenABITypes(clangASTContext, Module);

  if (Opts.DebugInfoKind != IRGenDebugInfoKind::None) {
    DebugInfo = new IRGenDebugInfo(Opts, *CI, *this, Module, SF);
  }

  initClangTypeConverter();
}
Exemplo n.º 3
0
IRGenModule::IRGenModule(IRGenerator &irgen,
                         std::unique_ptr<llvm::TargetMachine> &&target,
                         SourceFile *SF, llvm::LLVMContext &LLVMContext,
                         StringRef ModuleName, StringRef OutputFilename)
    : IRGen(irgen), Context(irgen.SIL.getASTContext()),
      ClangCodeGen(createClangCodeGenerator(Context, LLVMContext, irgen.Opts,
                                            ModuleName)),
      Module(*ClangCodeGen->GetModule()), LLVMContext(Module.getContext()),
      DataLayout(target->createDataLayout()), Triple(Context.LangOpts.Target),
      TargetMachine(std::move(target)), silConv(irgen.SIL),
      OutputFilename(OutputFilename),
      TargetInfo(SwiftTargetInfo::get(*this)), DebugInfo(nullptr),
      ModuleHash(nullptr), ObjCInterop(Context.LangOpts.EnableObjCInterop),
      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());
  Int64Ty = llvm::Type::getInt64Ty(getLLVMContext());
  Int8PtrTy = llvm::Type::getInt8PtrTy(getLLVMContext());
  Int8PtrPtrTy = Int8PtrTy->getPointerTo(0);
  SizeTy = DataLayout.getIntPtrType(getLLVMContext(), /*addrspace*/ 0);

  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, native weak references are just a pointer.
  WeakReferencePtrTy =
    createStructPointerType(*this, "swift.weak", { RefCountedPtrTy });

  // Native unowned references are just a pointer.
  UnownedReferencePtrTy =
    createStructPointerType(*this, "swift.unowned", { RefCountedPtrTy });

  // 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);

  // 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
    Int8PtrTy,              // required objc class methods
    Int8PtrTy,              // optional objc instance methods
    Int8PtrTy,              // optional objc class methods
    Int8PtrTy,              // objc properties
    Int32Ty,                // size
    Int32Ty,                // flags
    Int16Ty,                // minimum witness count
    Int16Ty,                // default witness count
    Int32Ty                 // padding
  });
  
  ProtocolDescriptorPtrTy = ProtocolDescriptorStructTy->getPointerTo();
  
  // A tuple type metadata record has a couple extra fields.
  auto tupleElementTy = createStructType(*this, "swift.tuple_element_type", {
    TypeMetadataPtrTy,      // Metadata *Type;
    SizeTy                  // size_t Offset;
  });
  TupleTypeMetadataPtrTy = createStructPointerType(*this, "swift.tuple_type", {
    TypeMetadataStructTy,   // (base)
    SizeTy,                 // size_t NumElements;
    Int8PtrTy,              // const char *Labels;
    llvm::ArrayType::get(tupleElementTy, 0) // Element Elements[];
  });

  // A full type metadata record is basically just an adjustment to the
  // address point of a type metadata.  Resilience may cause
  // additional data to be laid out prior to this address point.
  FullTypeMetadataStructTy = createStructType(*this, "swift.full_type", {
    WitnessTablePtrTy,
    TypeMetadataStructTy
  });
  FullTypeMetadataPtrTy = FullTypeMetadataStructTy->getPointerTo(DefaultAS);

  // A metadata pattern is a structure from which generic type
  // metadata are allocated.  We leave this struct type intentionally
  // opaque, because the compiler basically never needs to access
  // anything from one.
  TypeMetadataPatternStructTy =
    llvm::StructType::create(getLLVMContext(), "swift.type_pattern");
  TypeMetadataPatternPtrTy =
    TypeMetadataPatternStructTy->getPointerTo(DefaultAS);

  DeallocatingDtorTy = llvm::FunctionType::get(VoidTy, RefCountedPtrTy, false);
  llvm::Type *dtorPtrTy = DeallocatingDtorTy->getPointerTo();

  // A full heap metadata is basically just an additional small prefix
  // on a full metadata, used for metadata corresponding to heap
  // allocations.
  FullHeapMetadataStructTy =
                  createStructType(*this, "swift.full_heapmetadata", {
    dtorPtrTy,
    WitnessTablePtrTy,
    TypeMetadataStructTy
  });
  FullHeapMetadataPtrTy = FullHeapMetadataStructTy->getPointerTo(DefaultAS);

  // A full box metadata is non-type heap metadata for a heap allocation of a
  // single value. The box tracks the offset to the value inside the box.
  FullBoxMetadataStructTy =
                  createStructType(*this, "swift.full_boxmetadata", {
    dtorPtrTy,
    WitnessTablePtrTy,
    TypeMetadataStructTy,
    Int32Ty,
    CaptureDescriptorPtrTy,
  });
  FullBoxMetadataPtrTy = FullBoxMetadataStructTy->getPointerTo(DefaultAS);

  llvm::Type *refCountedElts[] = {TypeMetadataPtrTy, Int32Ty, Int32Ty};
  RefCountedStructTy->setBody(refCountedElts);

  PtrSize = Size(DataLayout.getPointerSize(DefaultAS));

  FunctionPairTy = createStructType(*this, "swift.function", {
    FunctionPtrTy,
    RefCountedPtrTy,
  });

  OpaqueTy = llvm::StructType::create(LLVMContext, "swift.opaque");
  OpaquePtrTy = OpaqueTy->getPointerTo(DefaultAS);

  ProtocolConformanceRecordTy
    = createStructType(*this, "swift.protocol_conformance", {
      RelativeAddressTy,
      RelativeAddressTy,
      RelativeAddressTy,
      Int32Ty
    });
  ProtocolConformanceRecordPtrTy
    = ProtocolConformanceRecordTy->getPointerTo(DefaultAS);

  NominalTypeDescriptorTy
    = llvm::StructType::create(LLVMContext, "swift.type_descriptor");
  NominalTypeDescriptorPtrTy
    = NominalTypeDescriptorTy->getPointerTo(DefaultAS);

  TypeMetadataRecordTy
    = createStructType(*this, "swift.type_metadata_record", {
      RelativeAddressTy,
      Int32Ty
    });
  TypeMetadataRecordPtrTy
    = TypeMetadataRecordTy->getPointerTo(DefaultAS);

  FieldDescriptorTy
    = llvm::StructType::create(LLVMContext, "swift.field_descriptor");
  FieldDescriptorPtrTy = FieldDescriptorTy->getPointerTo(DefaultAS);

  FixedBufferTy = nullptr;
  for (unsigned i = 0; i != MaxNumValueWitnesses; ++i)
    ValueWitnessTys[i] = nullptr;

  ObjCPtrTy = llvm::StructType::create(getLLVMContext(), "objc_object")
                ->getPointerTo(DefaultAS);
  BridgeObjectPtrTy = llvm::StructType::create(getLLVMContext(), "swift.bridge")
                ->getPointerTo(DefaultAS);

  ObjCClassStructTy = llvm::StructType::create(LLVMContext, "objc_class");
  ObjCClassPtrTy = ObjCClassStructTy->getPointerTo(DefaultAS);
  llvm::Type *objcClassElts[] = {
    ObjCClassPtrTy,
    ObjCClassPtrTy,
    OpaquePtrTy,
    OpaquePtrTy,
    IntPtrTy
  };
  ObjCClassStructTy->setBody(objcClassElts);

  ObjCSuperStructTy = llvm::StructType::create(LLVMContext, "objc_super");
  ObjCSuperPtrTy = ObjCSuperStructTy->getPointerTo(DefaultAS);
  llvm::Type *objcSuperElts[] = {
    ObjCPtrTy,
    ObjCClassPtrTy
  };
  ObjCSuperStructTy->setBody(objcSuperElts);
  
  ObjCBlockStructTy = llvm::StructType::create(LLVMContext, "objc_block");
  ObjCBlockPtrTy = ObjCBlockStructTy->getPointerTo(DefaultAS);
  llvm::Type *objcBlockElts[] = {
    ObjCClassPtrTy, // isa
    Int32Ty,        // flags
    Int32Ty,        // reserved
    FunctionPtrTy,  // invoke function pointer
    Int8PtrTy,      // TODO: block descriptor pointer.
                    // We will probably need a struct type for that at some
                    // point too.
  };
  ObjCBlockStructTy->setBody(objcBlockElts);
  
  auto ErrorStructTy = llvm::StructType::create(LLVMContext, "swift.error");
  // ErrorStruct is currently opaque to the compiler.
  ErrorPtrTy = ErrorStructTy->getPointerTo(DefaultAS);
  
  llvm::Type *openedErrorTriple[] = {
    OpaquePtrTy,
    TypeMetadataPtrTy,
    WitnessTablePtrTy,
  };
  OpenedErrorTripleTy = llvm::StructType::get(getLLVMContext(),
                                              openedErrorTriple,
                                              /*packed*/ false);
  OpenedErrorTriplePtrTy = OpenedErrorTripleTy->getPointerTo(DefaultAS);

  InvariantMetadataID = LLVMContext.getMDKindID("invariant.load");
  InvariantNode = llvm::MDNode::get(LLVMContext, {});
  DereferenceableID = LLVMContext.getMDKindID("dereferenceable");
  
  C_CC = llvm::CallingConv::C;
  // TODO: use "tinycc" on platforms that support it
  DefaultCC = SWIFT_LLVM_CC(DefaultCC);
  // If it is an interpreter, don't use try to use any
  // advanced calling conventions and use instead a
  // more conservative C calling convention. This
  // makes sure that none of the registers eventually
  // used by the dynamic linker are used by generated code.
  // TODO: Check that the deployment target supports the new
  // calling convention. Older versions of the runtime library
  // may not contain the entries using the new calling convention.

  // Only use the new calling conventions on platforms that support it.
  auto Arch = Triple.getArch();
  (void)Arch;
  if (SWIFT_RT_USE_RegisterPreservingCC &&
      Arch == llvm::Triple::ArchType::aarch64)
    RegisterPreservingCC = SWIFT_LLVM_CC(RegisterPreservingCC);
  else
    RegisterPreservingCC = DefaultCC;

  SwiftCC = SWIFT_LLVM_CC(SwiftCC);
  UseSwiftCC = (SwiftCC == llvm::CallingConv::Swift);

  if (IRGen.Opts.DebugInfoKind > IRGenDebugInfoKind::None)
    DebugInfo = IRGenDebugInfo::createIRGenDebugInfo(IRGen.Opts, *CI, *this,
                                                     Module, SF);

  initClangTypeConverter();

  if (ClangASTContext) {
    auto atomicBoolTy = ClangASTContext->getAtomicType(ClangASTContext->BoolTy);
    AtomicBoolSize = Size(ClangASTContext->getTypeSize(atomicBoolTy));
    AtomicBoolAlign = Alignment(ClangASTContext->getTypeSize(atomicBoolTy));
  }

  IsSwiftErrorInRegister =
    clang::CodeGen::swiftcall::isSwiftErrorLoweredInRegister(
      ClangCodeGen->CGM());
}