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91995c40d4282b068dca7a824d2ed628fa5ef335
swift-mirror/lib/IRGen/IRGenModule.cpp
Arnold Schwaighofer 91995c40d4 IRGen: Add code for recursive type layout based witness generation 
This adds code that can be used to build recursive type layouts. And
code that generates value witness IR based on the recursive type
layouts.

Value witnesses generated based on type layouts will only refer to
archetypes when computing fields offsets for frozen generic types (vs
instantiated type medata).

rdar://51988441
2020-02-19 07:12:55 -08:00

1414 lines
51 KiB
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//===--- IRGenModule.cpp - Swift Global LLVM IR Generation ----------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// This file implements IR generation for global declarations in Swift.
//
//===----------------------------------------------------------------------===//
#include "swift/AST/Availability.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/Module.h"
#include "swift/AST/DiagnosticsIRGen.h"
#include "swift/AST/IRGenOptions.h"
#include "swift/Basic/Dwarf.h"
#include "swift/Demangling/ManglingMacros.h"
#include "swift/ClangImporter/ClangImporter.h"
#include "swift/IRGen/IRGenPublic.h"
#include "swift/IRGen/Linking.h"
#include "swift/Runtime/RuntimeFnWrappersGen.h"
#include "swift/Runtime/Config.h"
#include "clang/AST/ASTContext.h"
#include "clang/Basic/CharInfo.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/CodeGen/CodeGenABITypes.h"
#include "clang/CodeGen/ModuleBuilder.h"
#include "clang/CodeGen/SwiftCallingConv.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Lex/PreprocessorOptions.h"
#include "clang/Lex/HeaderSearch.h"
#include "clang/Lex/HeaderSearchOptions.h"
#include "clang/Basic/CodeGenOptions.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/MDBuilder.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/ADT/PointerUnion.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MD5.h"
#include "ConformanceDescription.h"
#include "GenDecl.h"
#include "GenEnum.h"
#include "GenIntegerLiteral.h"
#include "GenType.h"
#include "IRGenModule.h"
#include "IRGenDebugInfo.h"
#include "ProtocolInfo.h"
#include "StructLayout.h"
#include <initializer_list>
using namespace swift;
using namespace irgen;
using llvm::Attribute;
const unsigned DefaultAS = 0;
/// A helper for creating LLVM struct types.
static llvm::StructType *createStructType(IRGenModule &IGM,
StringRef name,
std::initializer_list<llvm::Type*> types,
bool packed = false) {
return llvm::StructType::create(IGM.getLLVMContext(),
ArrayRef<llvm::Type*>(types.begin(),
types.size()),
name, packed);
};
/// A helper for creating pointer-to-struct types.
static llvm::PointerType *createStructPointerType(IRGenModule &IGM,
StringRef name,
std::initializer_list<llvm::Type*> types) {
return createStructType(IGM, name, types)->getPointerTo(DefaultAS);
};
static clang::CodeGenerator *createClangCodeGenerator(ASTContext &Context,
llvm::LLVMContext &LLVMContext,
const IRGenOptions &Opts,
StringRef ModuleName,
StringRef PD) {
auto Loader = Context.getClangModuleLoader();
auto *Importer = static_cast<ClangImporter*>(&*Loader);
assert(Importer && "No clang module loader!");
auto &ClangContext = Importer->getClangASTContext();
auto &CGO = Importer->getClangCodeGenOpts();
CGO.OptimizationLevel = Opts.shouldOptimize() ? 3 : 0;
CGO.setFramePointer(Opts.DisableFPElim
? clang::CodeGenOptions::FramePointerKind::All
: clang::CodeGenOptions::FramePointerKind::None);
CGO.DiscardValueNames = !Opts.shouldProvideValueNames();
switch (Opts.DebugInfoLevel) {
case IRGenDebugInfoLevel::None:
CGO.setDebugInfo(clang::codegenoptions::DebugInfoKind::NoDebugInfo);
break;
case IRGenDebugInfoLevel::LineTables:
CGO.setDebugInfo(clang::codegenoptions::DebugInfoKind::DebugLineTablesOnly);
break;
case IRGenDebugInfoLevel::ASTTypes:
case IRGenDebugInfoLevel::DwarfTypes:
CGO.DebugTypeExtRefs = true;
CGO.setDebugInfo(clang::codegenoptions::DebugInfoKind::FullDebugInfo);
break;
}
switch (Opts.DebugInfoFormat) {
case IRGenDebugInfoFormat::None:
break;
case IRGenDebugInfoFormat::DWARF:
CGO.DebugCompilationDir = Opts.DebugCompilationDir;
CGO.DwarfVersion = Opts.DWARFVersion;
CGO.DwarfDebugFlags = Opts.getDebugFlags(PD);
break;
case IRGenDebugInfoFormat::CodeView:
CGO.EmitCodeView = true;
CGO.DebugCompilationDir = Opts.DebugCompilationDir;
// This actually contains the debug flags for codeview.
CGO.DwarfDebugFlags = Opts.getDebugFlags(PD);
break;
}
auto &HSI = Importer->getClangPreprocessor()
.getHeaderSearchInfo()
.getHeaderSearchOpts();
auto &PPO = Importer->getClangPreprocessor().getPreprocessorOpts();
auto *ClangCodeGen = clang::CreateLLVMCodeGen(ClangContext.getDiagnostics(),
ModuleName, HSI, PPO, CGO,
LLVMContext);
ClangCodeGen->Initialize(ClangContext);
return ClangCodeGen;
}
IRGenModule::IRGenModule(IRGenerator &irgen,
std::unique_ptr<llvm::TargetMachine> &&target,
SourceFile *SF, llvm::LLVMContext &LLVMContext,
StringRef ModuleName, StringRef OutputFilename,
StringRef MainInputFilenameForDebugInfo,
StringRef PrivateDiscriminator)
: IRGen(irgen), Context(irgen.SIL.getASTContext()),
ClangCodeGen(createClangCodeGenerator(Context, LLVMContext, irgen.Opts,
ModuleName, PrivateDiscriminator)),
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)
});
TypeLayoutTy = createStructType(*this, "swift.type_layout", {
SizeTy, // size
SizeTy, // stride
Int32Ty, // flags
Int32Ty // extra inhabitant count
});
// 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;
Int32Ty // int32_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);
// Class _Nullable callback(Class _Nonnull cls, void * _Nullable arg);
llvm::Type *params[] = { ObjCClassPtrTy, Int8PtrTy };
ObjCUpdateCallbackTy = llvm::FunctionType::get(ObjCClassPtrTy, params, false);
// The full class stub structure, including a word before the address point.
ObjCFullResilientClassStubTy = createStructType(*this, "objc_full_class_stub", {
SizeTy, // zero padding to appease the linker
SizeTy, // isa pointer -- always 1
ObjCUpdateCallbackTy->getPointerTo() // the update callback
});
// What we actually export.
ObjCResilientClassStubTy = createStructType(*this, "objc_class_stub", {
SizeTy, // isa pointer -- always 1
ObjCUpdateCallbackTy->getPointerTo() // the update callback
});
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);
// todo
OpaqueTypeDescriptorTy = TypeContextDescriptorTy;
OpaqueTypeDescriptorPtrTy = OpaqueTypeDescriptorTy->getPointerTo();
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,
PrivateDiscriminator);
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});
DifferentiabilityWitnessTy = createStructType(
*this, "swift.differentiability_witness", {Int8PtrTy, Int8PtrTy});
}
IRGenModule::~IRGenModule() {
destroyClangTypeConverter();
destroyMetadataLayoutMap();
delete &Types;
}
static bool isReturnAttribute(llvm::Attribute::AttrKind Attr);
// Explicitly listing these constants is an unfortunate compromise for
// making the database file much more compact.
//
// They have to be non-local because otherwise we'll get warnings when
// a particular x-macro expansion doesn't use one.
namespace RuntimeConstants {
const auto ReadNone = llvm::Attribute::ReadNone;
const auto ReadOnly = llvm::Attribute::ReadOnly;
const auto ArgMemOnly = llvm::Attribute::ArgMemOnly;
const auto NoReturn = llvm::Attribute::NoReturn;
const auto NoUnwind = llvm::Attribute::NoUnwind;
const auto ZExt = llvm::Attribute::ZExt;
const auto FirstParamReturned = llvm::Attribute::Returned;
RuntimeAvailability AlwaysAvailable(ASTContext &Context) {
return RuntimeAvailability::AlwaysAvailable;
}
bool
isDeploymentAvailabilityContainedIn(ASTContext &Context,
AvailabilityContext featureAvailability) {
auto deploymentAvailability =
AvailabilityContext::forDeploymentTarget(Context);
return deploymentAvailability.isContainedIn(featureAvailability);
}
RuntimeAvailability OpaqueTypeAvailability(ASTContext &Context) {
auto featureAvailability = Context.getOpaqueTypeAvailability();
if (!isDeploymentAvailabilityContainedIn(Context, featureAvailability)) {
return RuntimeAvailability::ConditionallyAvailable;
}
return RuntimeAvailability::AlwaysAvailable;
}
RuntimeAvailability
GetTypesInAbstractMetadataStateAvailability(ASTContext &context) {
auto featureAvailability =
context.getTypesInAbstractMetadataStateAvailability();
if (!isDeploymentAvailabilityContainedIn(context, featureAvailability)) {
return RuntimeAvailability::ConditionallyAvailable;
}
return RuntimeAvailability::AlwaysAvailable;
}
RuntimeAvailability DynamicReplacementAvailability(ASTContext &Context) {
auto featureAvailability = Context.getSwift51Availability();
if (!isDeploymentAvailabilityContainedIn(Context, featureAvailability)) {
return RuntimeAvailability::AvailableByCompatibilityLibrary;
}
return RuntimeAvailability::AlwaysAvailable;
}
} // namespace RuntimeConstants
// We don't use enough attributes to justify generalizing the
// RuntimeFunctions.def FUNCTION macro. Instead, special case the one attribute
// associated with the return type not the function type.
static bool isReturnAttribute(llvm::Attribute::AttrKind Attr) {
return Attr == llvm::Attribute::ZExt;
}
// Similar to the 'return' attribute we assume that the 'returned' attributed is
// associated with the first function parameter.
static bool isReturnedAttribute(llvm::Attribute::AttrKind Attr) {
return Attr == llvm::Attribute::Returned;
}
namespace {
bool isStandardLibrary(const llvm::Module &M) {
if (auto *Flags = M.getNamedMetadata("swift.module.flags")) {
for (const auto *F : Flags->operands()) {
const auto *Key = dyn_cast_or_null<llvm::MDString>(F->getOperand(0));
if (!Key)
continue;
const auto *Value =
dyn_cast_or_null<llvm::ConstantAsMetadata>(F->getOperand(1));
if (!Value)
continue;
if (Key->getString() == "standard-library")
return cast<llvm::ConstantInt>(Value->getValue())->isOne();
}
}
return false;
}
}
bool IRGenModule::isStandardLibrary() const {
return ::isStandardLibrary(Module);
}
llvm::Constant *swift::getRuntimeFn(llvm::Module &Module,
llvm::Constant *&cache,
const char *name,
llvm::CallingConv::ID cc,
RuntimeAvailability availability,
llvm::ArrayRef<llvm::Type*> retTypes,
llvm::ArrayRef<llvm::Type*> argTypes,
ArrayRef<Attribute::AttrKind> attrs) {
if (cache)
return cache;
bool isWeakLinked = false;
std::string functionName(name);
switch (availability) {
case RuntimeAvailability::AlwaysAvailable:
// Nothing to do.
break;
case RuntimeAvailability::ConditionallyAvailable: {
isWeakLinked = true;
break;
}
case RuntimeAvailability::AvailableByCompatibilityLibrary: {
functionName.append("50");
break;
}
}
llvm::Type *retTy;
if (retTypes.size() == 1)
retTy = *retTypes.begin();
else
retTy = llvm::StructType::get(Module.getContext(),
{retTypes.begin(), retTypes.end()},
/*packed*/ false);
auto fnTy = llvm::FunctionType::get(retTy,
{argTypes.begin(), argTypes.end()},
/*isVararg*/ false);
auto addr = Module.getOrInsertFunction(functionName.c_str(), fnTy).getCallee();
auto fnptr = addr;
// Strip off any bitcast we might have due to this function being declared of
// a different type previously.
if (auto bitcast = dyn_cast<llvm::BitCastInst>(fnptr))
fnptr = cast<llvm::Constant>(bitcast->getOperand(0));
cache = cast<llvm::Constant>(addr);
// Add any function attributes and set the calling convention.
if (auto fn = dyn_cast<llvm::Function>(fnptr)) {
fn->setCallingConv(cc);
bool IsExternal =
fn->getLinkage() == llvm::GlobalValue::AvailableExternallyLinkage ||
(fn->getLinkage() == llvm::GlobalValue::ExternalLinkage &&
fn->isDeclaration());
if (!isStandardLibrary(Module) && IsExternal &&
::useDllStorage(llvm::Triple(Module.getTargetTriple())))
fn->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
if (IsExternal && isWeakLinked
&& !::useDllStorage(llvm::Triple(Module.getTargetTriple())))
fn->setLinkage(llvm::GlobalValue::ExternalWeakLinkage);
llvm::AttrBuilder buildFnAttr;
llvm::AttrBuilder buildRetAttr;
llvm::AttrBuilder buildFirstParamAttr;
for (auto Attr : attrs) {
if (isReturnAttribute(Attr))
buildRetAttr.addAttribute(Attr);
else if (isReturnedAttribute(Attr))
buildFirstParamAttr.addAttribute(Attr);
else
buildFnAttr.addAttribute(Attr);
}
fn->addAttributes(llvm::AttributeList::FunctionIndex, buildFnAttr);
fn->addAttributes(llvm::AttributeList::ReturnIndex, buildRetAttr);
fn->addParamAttrs(0, buildFirstParamAttr);
}
return cache;
}
#define QUOTE(...) __VA_ARGS__
#define STR(X) #X
#define FUNCTION(ID, NAME, CC, AVAILABILITY, RETURNS, ARGS, ATTRS) \
FUNCTION_IMPL(ID, NAME, CC, AVAILABILITY, QUOTE(RETURNS), QUOTE(ARGS), QUOTE(ATTRS))
#define RETURNS(...) { __VA_ARGS__ }
#define ARGS(...) { __VA_ARGS__ }
#define NO_ARGS {}
#define ATTRS(...) { __VA_ARGS__ }
#define NO_ATTRS {}
#define FUNCTION_IMPL(ID, NAME, CC, AVAILABILITY, RETURNS, ARGS, ATTRS) \
llvm::Constant *IRGenModule::get##ID##Fn() { \
using namespace RuntimeConstants; \
return getRuntimeFn(Module, ID##Fn, #NAME, CC, \
AVAILABILITY(this->Context), \
RETURNS, ARGS, ATTRS); \
}
#include "swift/Runtime/RuntimeFunctions.def"
std::pair<llvm::GlobalVariable *, llvm::Constant *>
IRGenModule::createStringConstant(StringRef Str,
bool willBeRelativelyAddressed, StringRef sectionName) {
// If not, create it. This implicitly adds a trailing null.
auto init = llvm::ConstantDataArray::getString(LLVMContext, Str);
auto global = new llvm::GlobalVariable(Module, init->getType(), true,
llvm::GlobalValue::PrivateLinkage,
init);
// FIXME: ld64 crashes resolving relative references to coalesceable symbols.
// rdar://problem/22674524
// If we intend to relatively address this string, don't mark it with
// unnamed_addr to prevent it from going into the cstrings section and getting
// coalesced.
if (!willBeRelativelyAddressed)
global->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
if (!sectionName.empty())
global->setSection(sectionName);
// Drill down to make an i8*.
auto zero = llvm::ConstantInt::get(SizeTy, 0);
llvm::Constant *indices[] = { zero, zero };
auto address = llvm::ConstantExpr::getInBoundsGetElementPtr(
global->getValueType(), global, indices);
return { global, address };
}
#define KNOWN_METADATA_ACCESSOR(NAME, SYM) \
llvm::Constant *IRGenModule::get##NAME() { \
if (NAME) \
return NAME; \
NAME = Module.getOrInsertGlobal(SYM, FullTypeMetadataStructTy); \
if (useDllStorage() && !isStandardLibrary()) \
ApplyIRLinkage(IRLinkage::ExternalImport) \
.to(cast<llvm::GlobalVariable>(NAME)); \
return NAME; \
}
KNOWN_METADATA_ACCESSOR(EmptyTupleMetadata,
MANGLE_AS_STRING(METADATA_SYM(EMPTY_TUPLE_MANGLING)))
KNOWN_METADATA_ACCESSOR(AnyExistentialMetadata,
MANGLE_AS_STRING(METADATA_SYM(ANY_MANGLING)))
KNOWN_METADATA_ACCESSOR(AnyObjectExistentialMetadata,
MANGLE_AS_STRING(METADATA_SYM(ANYOBJECT_MANGLING)))
#undef KNOWN_METADATA_ACCESSOR
llvm::Constant *IRGenModule::getObjCEmptyCachePtr() {
if (ObjCEmptyCachePtr)
return ObjCEmptyCachePtr;
if (ObjCInterop) {
// struct objc_cache _objc_empty_cache;
ObjCEmptyCachePtr = Module.getOrInsertGlobal("_objc_empty_cache",
OpaquePtrTy->getElementType());
ApplyIRLinkage(IRLinkage::ExternalImport)
.to(cast<llvm::GlobalVariable>(ObjCEmptyCachePtr));
} else {
// FIXME: Remove even the null value per rdar://problem/18801263
ObjCEmptyCachePtr = llvm::ConstantPointerNull::get(OpaquePtrTy);
}
return ObjCEmptyCachePtr;
}
llvm::Constant *IRGenModule::getObjCEmptyVTablePtr() {
// IMP _objc_empty_vtable;
// On recent Darwin platforms, this symbol is defined at
// runtime as an absolute symbol with the value of null. Older ObjCs
// didn't guarantee _objc_empty_vtable to be nil, but Swift doesn't
// deploy far enough back for that to be a concern.
// FIXME: When !ObjCInterop, we should remove even the null value per
// rdar://problem/18801263
if (!ObjCEmptyVTablePtr)
ObjCEmptyVTablePtr = llvm::ConstantPointerNull::get(OpaquePtrTy);
return ObjCEmptyVTablePtr;
}
Address IRGenModule::getAddrOfObjCISAMask() {
// This symbol is only exported by the runtime if the platform uses
// isa masking.
assert(TargetInfo.hasISAMasking());
if (!ObjCISAMaskPtr) {
ObjCISAMaskPtr = Module.getOrInsertGlobal("swift_isaMask", IntPtrTy);
ApplyIRLinkage(IRLinkage::ExternalImport)
.to(cast<llvm::GlobalVariable>(ObjCISAMaskPtr));
}
return Address(ObjCISAMaskPtr, getPointerAlignment());
}
ModuleDecl *IRGenModule::getSwiftModule() const {
return IRGen.SIL.getSwiftModule();
}
AvailabilityContext IRGenModule::getAvailabilityContext() const {
return AvailabilityContext::forDeploymentTarget(Context);
}
Lowering::TypeConverter &IRGenModule::getSILTypes() const {
return IRGen.SIL.Types;
}
clang::CodeGen::CodeGenModule &IRGenModule::getClangCGM() const {
return ClangCodeGen->CGM();
}
llvm::Module *IRGenModule::getModule() const {
return ClangCodeGen->GetModule();
}
llvm::Module *IRGenModule::releaseModule() {
return ClangCodeGen->ReleaseModule();
}
bool IRGenerator::canEmitWitnessTableLazily(SILWitnessTable *wt) {
if (Opts.UseJIT)
return false;
// Regardless of the access level, if the witness table is shared it means
// we can safely not emit it. Every other module which needs it will generate
// its own shared copy of it.
if (wt->getLinkage() == SILLinkage::Shared)
return true;
NominalTypeDecl *ConformingTy =
wt->getConformingType()->getNominalOrBoundGenericNominal();
switch (ConformingTy->getEffectiveAccess()) {
case AccessLevel::Private:
case AccessLevel::FilePrivate:
return true;
case AccessLevel::Internal:
return PrimaryIGM->getSILModule().isWholeModule();
default:
return false;
}
llvm_unreachable("switch does not handle all cases");
}
void IRGenerator::addLazyWitnessTable(const ProtocolConformance *Conf) {
if (auto *wt = SIL.lookUpWitnessTable(Conf, /*deserializeLazily=*/false)) {
// Add it to the queue if it hasn't already been put there.
if (canEmitWitnessTableLazily(wt) &&
LazilyEmittedWitnessTables.insert(wt).second) {
assert(!FinishedEmittingLazyDefinitions);
LazyWitnessTables.push_back(wt);
}
}
}
void IRGenerator::addClassForEagerInitialization(ClassDecl *ClassDecl) {
if (!ClassDecl->getAttrs().hasAttribute<StaticInitializeObjCMetadataAttr>())
return;
assert(!ClassDecl->isGenericContext());
assert(!ClassDecl->hasClangNode());
ClassesForEagerInitialization.push_back(ClassDecl);
}
llvm::AttributeList IRGenModule::getAllocAttrs() {
if (AllocAttrs.isEmpty()) {
AllocAttrs =
llvm::AttributeList::get(LLVMContext, llvm::AttributeList::ReturnIndex,
llvm::Attribute::NoAlias);
AllocAttrs =
AllocAttrs.addAttribute(LLVMContext, llvm::AttributeList::FunctionIndex,
llvm::Attribute::NoUnwind);
}
return AllocAttrs;
}
/// Disable thumb-mode until debugger support is there.
bool swift::irgen::shouldRemoveTargetFeature(StringRef feature) {
return feature == "+thumb-mode";
}
void IRGenModule::setHasFramePointer(llvm::AttrBuilder &Attrs,
bool HasFramePointer) {
Attrs.addAttribute("frame-pointer", HasFramePointer ? "all" : "none");
}
void IRGenModule::setHasFramePointer(llvm::Function *F,
bool HasFramePointer) {
llvm::AttrBuilder b;
setHasFramePointer(b, HasFramePointer);
F->addAttributes(llvm::AttributeList::FunctionIndex, b);
}
/// Construct initial function attributes from options.
void IRGenModule::constructInitialFnAttributes(llvm::AttrBuilder &Attrs,
OptimizationMode FuncOptMode) {
// Add frame pointer attributes.
setHasFramePointer(Attrs, IRGen.Opts.DisableFPElim);
// Add target-cpu and target-features if they are non-null.
auto *Clang = static_cast<ClangImporter *>(Context.getClangModuleLoader());
clang::TargetOptions &ClangOpts = Clang->getTargetInfo().getTargetOpts();
std::string &CPU = ClangOpts.CPU;
if (CPU != "")
Attrs.addAttribute("target-cpu", CPU);
std::vector<std::string> Features;
for (auto &F : ClangOpts.Features)
if (!shouldRemoveTargetFeature(F))
Features.push_back(F);
if (!Features.empty()) {
SmallString<64> allFeatures;
// Sort so that the target features string is canonical.
std::sort(Features.begin(), Features.end());
interleave(Features, [&](const std::string &s) {
allFeatures.append(s);
}, [&]{
allFeatures.push_back(',');
});
Attrs.addAttribute("target-features", allFeatures);
}
if (FuncOptMode == OptimizationMode::NotSet)
FuncOptMode = IRGen.Opts.OptMode;
if (FuncOptMode == OptimizationMode::ForSize)
Attrs.addAttribute(llvm::Attribute::MinSize);
}
llvm::AttributeList IRGenModule::constructInitialAttributes() {
llvm::AttrBuilder b;
constructInitialFnAttributes(b);
return llvm::AttributeList::get(LLVMContext,
llvm::AttributeList::FunctionIndex, b);
}
llvm::ConstantInt *IRGenModule::getInt32(uint32_t value) {
return llvm::ConstantInt::get(Int32Ty, value);
}
llvm::Constant *IRGenModule::getSize(Size size) {
return llvm::ConstantInt::get(SizeTy, size.getValue());
}
llvm::Constant *IRGenModule::getOpaquePtr(llvm::Constant *ptr) {
return llvm::ConstantExpr::getBitCast(ptr, Int8PtrTy);
}
static void appendEncodedName(raw_ostream &os, StringRef name) {
if (clang::isValidIdentifier(name)) {
os << "_" << name;
} else {
for (auto c : name)
os.write_hex(static_cast<uint8_t>(c));
}
}
static void appendEncodedName(llvm::SmallVectorImpl<char> &buf,
StringRef name) {
llvm::raw_svector_ostream os{buf};
appendEncodedName(os, name);
}
StringRef
swift::irgen::encodeForceLoadSymbolName(llvm::SmallVectorImpl<char> &buf,
StringRef name) {
llvm::raw_svector_ostream os{buf};
os << "_swift_FORCE_LOAD_$";
appendEncodedName(os, name);
return os.str();
}
llvm::SmallString<32> getTargetDependentLibraryOption(const llvm::Triple &T,
StringRef library) {
llvm::SmallString<32> buffer;
if (T.isWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) {
bool quote = library.find(' ') != StringRef::npos;
buffer += "/DEFAULTLIB:";
if (quote)
buffer += '"';
buffer += library;
if (!library.endswith_lower(".lib"))
buffer += ".lib";
if (quote)
buffer += '"';
} else if (T.isPS4()) {
bool quote = library.find(' ') != StringRef::npos;
buffer += "\01";
if (quote)
buffer += '"';
buffer += library;
if (quote)
buffer += '"';
} else {
buffer += "-l";
buffer += library;
}
return buffer;
}
void IRGenModule::addLinkLibrary(const LinkLibrary &linkLib) {
llvm::LLVMContext &ctx = Module.getContext();
// The debugger gets the autolink information directly from
// the LinkLibraries of the module, so there's no reason to
// emit it into the IR of debugger expressions.
if (Context.LangOpts.DebuggerSupport)
return;
switch (linkLib.getKind()) {
case LibraryKind::Library: {
llvm::SmallString<32> opt =
getTargetDependentLibraryOption(Triple, linkLib.getName());
AutolinkEntries.push_back(
llvm::MDNode::get(ctx, llvm::MDString::get(ctx, opt)));
break;
}
case LibraryKind::Framework: {
// If we're supposed to disable autolinking of this framework, bail out.
auto &frameworks = IRGen.Opts.DisableAutolinkFrameworks;
if (std::find(frameworks.begin(), frameworks.end(), linkLib.getName())
!= frameworks.end())
return;
llvm::Metadata *args[] = {
llvm::MDString::get(ctx, "-framework"),
llvm::MDString::get(ctx, linkLib.getName())
};
AutolinkEntries.push_back(llvm::MDNode::get(ctx, args));
break;
}
}
if (linkLib.shouldForceLoad()) {
llvm::SmallString<64> buf;
encodeForceLoadSymbolName(buf, linkLib.getName());
auto ForceImportThunk = cast<llvm::Function>(
Module.getOrInsertFunction(buf, llvm::FunctionType::get(VoidTy, false))
.getCallee());
const IRLinkage IRL =
llvm::Triple(Module.getTargetTriple()).isOSBinFormatCOFF()
? IRLinkage::ExternalImport
: IRLinkage::ExternalWeakImport;
ApplyIRLinkage(IRL).to(cast<llvm::GlobalValue>(ForceImportThunk));
buf += "_$";
appendEncodedName(buf, IRGen.Opts.ModuleName);
if (!Module.getGlobalVariable(buf.str())) {
auto ref = new llvm::GlobalVariable(Module, ForceImportThunk->getType(),
/*isConstant=*/true,
llvm::GlobalValue::WeakODRLinkage,
ForceImportThunk, buf.str());
ApplyIRLinkage(IRLinkage::InternalWeakODR).to(ref);
auto casted = llvm::ConstantExpr::getBitCast(ref, Int8PtrTy);
LLVMUsed.push_back(casted);
}
}
}
static bool replaceModuleFlagsEntry(llvm::LLVMContext &Ctx,
llvm::Module &Module, StringRef EntryName,
llvm::Module::ModFlagBehavior Behavior,
llvm::Metadata *Val) {
auto *ModuleFlags = Module.getModuleFlagsMetadata();
for (unsigned I = 0, E = ModuleFlags->getNumOperands(); I != E; ++I) {
llvm::MDNode *Op = ModuleFlags->getOperand(I);
llvm::MDString *ID = cast<llvm::MDString>(Op->getOperand(1));
if (ID->getString().equals(EntryName)) {
// Create the new entry.
llvm::Type *Int32Ty = llvm::Type::getInt32Ty(Ctx);
llvm::Metadata *Ops[3] = {llvm::ConstantAsMetadata::get(
llvm::ConstantInt::get(Int32Ty, Behavior)),
llvm::MDString::get(Ctx, EntryName), Val};
ModuleFlags->setOperand(I, llvm::MDNode::get(Ctx, Ops));
return true;
}
}
llvm_unreachable("Could not replace old linker options entry?");
}
/// Returns true if the object file generated by \p IGM will be the "first"
/// object file in the module. This lets us determine where to put a symbol
/// that must be unique.
static bool isFirstObjectFileInModule(IRGenModule &IGM) {
if (IGM.getSILModule().isWholeModule())
return IGM.IRGen.getPrimaryIGM() == &IGM;
const DeclContext *DC = IGM.getSILModule().getAssociatedContext();
if (!DC)
return false;
assert(!isa<ModuleDecl>(DC) && "that would be a whole module build");
assert(isa<FileUnit>(DC) && "compiling something smaller than a file?");
ModuleDecl *containingModule = cast<FileUnit>(DC)->getParentModule();
return containingModule->getFiles().front() == DC;
}
void IRGenModule::emitAutolinkInfo() {
// Collect the linker options already in the module (from ClangCodeGen).
// FIXME: This constant should be vended by LLVM somewhere.
auto *Metadata = Module.getOrInsertNamedMetadata("llvm.linker.options");
for (llvm::MDNode *LinkOption : Metadata->operands())
AutolinkEntries.push_back(LinkOption);
// Remove duplicates.
llvm::SmallPtrSet<llvm::MDNode *, 4> knownAutolinkEntries;
AutolinkEntries.erase(std::remove_if(AutolinkEntries.begin(),
AutolinkEntries.end(),
[&](llvm::MDNode *entry) -> bool {
return !knownAutolinkEntries.insert(
entry).second;
}),
AutolinkEntries.end());
const bool AutolinkExtractRequired =
(TargetInfo.OutputObjectFormat == llvm::Triple::ELF && !Triple.isPS4()) ||
TargetInfo.OutputObjectFormat == llvm::Triple::Wasm ||
Triple.isOSCygMing();
if (!AutolinkExtractRequired) {
// On platforms that support autolinking, continue to use the metadata.
Metadata->clearOperands();
for (auto *Entry : AutolinkEntries)
Metadata->addOperand(Entry);
} else {
// Merge the entries into null-separated string.
llvm::SmallString<64> EntriesString;
for (auto &EntryNode : AutolinkEntries) {
const llvm::MDNode *MD = cast<llvm::MDNode>(EntryNode);
for (auto &Entry : MD->operands()) {
const llvm::MDString *MS = cast<llvm::MDString>(Entry);
EntriesString += MS->getString();
EntriesString += '\0';
}
}
auto EntriesConstant = llvm::ConstantDataArray::getString(
LLVMContext, EntriesString, /*AddNull=*/false);
// Mark the swift1_autolink_entries section with the SHF_EXCLUDE attribute
// to get the linker to drop it in the final linked binary.
// LLVM doesn't provide an interface to specify section attributs in the IR
// so we pass the attribute with inline assembly.
if (TargetInfo.OutputObjectFormat == llvm::Triple::ELF)
Module.appendModuleInlineAsm(".section .swift1_autolink_entries,"
"\"0x80000000\"");
auto var =
new llvm::GlobalVariable(*getModule(), EntriesConstant->getType(), true,
llvm::GlobalValue::PrivateLinkage,
EntriesConstant, "_swift1_autolink_entries");
var->setSection(".swift1_autolink_entries");
var->setAlignment(getPointerAlignment().getValue());
disableAddressSanitizer(*this, var);
addUsedGlobal(var);
}
if (!IRGen.Opts.ForceLoadSymbolName.empty() &&
(Triple.supportsCOMDAT() || isFirstObjectFileInModule(*this))) {
llvm::SmallString<64> buf;
encodeForceLoadSymbolName(buf, IRGen.Opts.ForceLoadSymbolName);
auto ForceImportThunk =
llvm::Function::Create(llvm::FunctionType::get(VoidTy, false),
llvm::GlobalValue::ExternalLinkage, buf,
&Module);
ApplyIRLinkage(IRLinkage::ExternalExport).to(ForceImportThunk);
if (Triple.supportsCOMDAT())
if (auto *GO = cast<llvm::GlobalObject>(ForceImportThunk))
GO->setComdat(Module.getOrInsertComdat(ForceImportThunk->getName()));
auto BB = llvm::BasicBlock::Create(getLLVMContext(), "", ForceImportThunk);
llvm::IRBuilder<> IRB(BB);
IRB.CreateRetVoid();
}
}
void IRGenModule::cleanupClangCodeGenMetadata() {
// Remove llvm.ident that ClangCodeGen might have left in the module.
auto *LLVMIdent = Module.getNamedMetadata("llvm.ident");
if (LLVMIdent)
Module.eraseNamedMetadata(LLVMIdent);
// LLVM's object-file emission collects a fixed set of keys for the
// image info.
// Using "Objective-C Garbage Collection" as the key here is a hack,
// but LLVM's object-file emission isn't general enough to collect
// arbitrary keys to put in the image info.
const char *ObjectiveCGarbageCollection = "Objective-C Garbage Collection";
uint8_t Major, Minor;
std::tie(Major, Minor) = version::getSwiftNumericVersion();
uint32_t Value = (Major << 24) | (Minor << 16) | (swiftVersion << 8);
if (Module.getModuleFlag(ObjectiveCGarbageCollection)) {
bool FoundOldEntry = replaceModuleFlagsEntry(
Module.getContext(), Module, ObjectiveCGarbageCollection,
llvm::Module::Override,
llvm::ConstantAsMetadata::get(
llvm::ConstantInt::get(Int32Ty, Value)));
(void)FoundOldEntry;
assert(FoundOldEntry && "Could not replace old module flag entry?");
} else
Module.addModuleFlag(llvm::Module::Override,
ObjectiveCGarbageCollection,
Value);
}
bool IRGenModule::finalize() {
const char *ModuleHashVarName = "llvm.swift_module_hash";
if (IRGen.Opts.OutputKind == IRGenOutputKind::ObjectFile &&
!Module.getGlobalVariable(ModuleHashVarName)) {
// Create a global variable into which we will store the hash of the
// module (used for incremental compilation).
// We have to create the variable now (before we emit the global lists).
// But we want to calculate the hash later because later we can do it
// multi-threaded.
llvm::MD5::MD5Result zero{};
ArrayRef<uint8_t> ZeroArr(reinterpret_cast<uint8_t *>(&zero), sizeof(zero));
auto *ZeroConst = llvm::ConstantDataArray::get(Module.getContext(), ZeroArr);
ModuleHash = new llvm::GlobalVariable(Module, ZeroConst->getType(), true,
llvm::GlobalValue::PrivateLinkage,
ZeroConst, ModuleHashVarName);
switch (TargetInfo.OutputObjectFormat) {
case llvm::Triple::MachO:
// On Darwin the linker ignores the __LLVM segment.
ModuleHash->setSection("__LLVM,__swift_modhash");
break;
case llvm::Triple::ELF:
case llvm::Triple::Wasm:
ModuleHash->setSection(".swift_modhash");
break;
case llvm::Triple::COFF:
ModuleHash->setSection(".sw5hash");
break;
default:
llvm_unreachable("Don't know how to emit the module hash for the selected"
"object format.");
}
addUsedGlobal(ModuleHash);
}
emitLazyPrivateDefinitions();
// Finalize clang IR-generation.
finalizeClangCodeGen();
// If that failed, report failure up and skip the final clean-up.
if (!ClangCodeGen->GetModule())
return false;
emitAutolinkInfo();
emitGlobalLists();
if (DebugInfo)
DebugInfo->finalize();
cleanupClangCodeGenMetadata();
return true;
}
/// Emit lazy definitions that have to be emitted in this specific
/// IRGenModule.
void IRGenModule::emitLazyPrivateDefinitions() {
emitLazyObjCProtocolDefinitions();
}
llvm::MDNode *IRGenModule::createProfileWeights(uint64_t TrueCount,
uint64_t FalseCount) const {
uint64_t MaxWeight = std::max(TrueCount, FalseCount);
uint64_t Scale = (MaxWeight > UINT32_MAX) ? UINT32_MAX : 1;
uint32_t ScaledTrueCount = (TrueCount / Scale) + 1;
uint32_t ScaledFalseCount = (FalseCount / Scale) + 1;
llvm::MDBuilder MDHelper(getLLVMContext());
return MDHelper.createBranchWeights(ScaledTrueCount, ScaledFalseCount);
}
void IRGenModule::unimplemented(SourceLoc loc, StringRef message) {
Context.Diags.diagnose(loc, diag::irgen_unimplemented, message);
}
void IRGenModule::fatal_unimplemented(SourceLoc loc, StringRef message) {
Context.Diags.diagnose(loc, diag::irgen_unimplemented, message);
llvm::report_fatal_error(llvm::Twine("unimplemented IRGen feature! ") +
message);
}
void IRGenModule::error(SourceLoc loc, const Twine &message) {
SmallVector<char, 128> buffer;
Context.Diags.diagnose(loc, diag::irgen_failure,
message.toStringRef(buffer));
}
bool IRGenModule::useDllStorage() { return ::useDllStorage(Triple); }
bool IRGenModule::shouldPrespecializeGenericMetadata() {
// Prespecialize generic metadata in the standard library always, disregarding
// flags.
if (isStandardLibrary()) {
return true;
}
auto &context = getSwiftModule()->getASTContext();
auto deploymentAvailability =
AvailabilityContext::forDeploymentTarget(context);
return IRGen.Opts.PrespecializeGenericMetadata &&
deploymentAvailability.isContainedIn(
context.getPrespecializedGenericMetadataAvailability()) &&
(Triple.isOSDarwin() || Triple.isTvOS() || Triple.isOSLinux());
}
void IRGenerator::addGenModule(SourceFile *SF, IRGenModule *IGM) {
assert(GenModules.count(SF) == 0);
GenModules[SF] = IGM;
if (!PrimaryIGM) {
PrimaryIGM = IGM;
}
Queue.push_back(IGM);
}
IRGenModule *IRGenerator::getGenModule(DeclContext *ctxt) {
if (GenModules.size() == 1 || !ctxt) {
return getPrimaryIGM();
}
SourceFile *SF = ctxt->getParentSourceFile();
if (!SF) {
return getPrimaryIGM();
}
IRGenModule *IGM = GenModules[SF];
assert(IGM);
return IGM;
}
IRGenModule *IRGenerator::getGenModule(SILFunction *f) {
if (GenModules.size() == 1) {
return getPrimaryIGM();
}
auto found = DefaultIGMForFunction.find(f);
if (found != DefaultIGMForFunction.end())
return found->second;
if (auto *dc = f->getDeclContext())
return getGenModule(dc);
return getPrimaryIGM();
}
uint32_t swift::irgen::getSwiftABIVersion() {
return IRGenModule::swiftVersion;
}
llvm::Triple IRGenerator::getEffectiveClangTriple() {
auto CI = static_cast<ClangImporter *>(
&*SIL.getASTContext().getClangModuleLoader());
assert(CI && "no clang module loader");
return llvm::Triple(CI->getTargetInfo().getTargetOpts().Triple);
}
const llvm::DataLayout &IRGenerator::getClangDataLayout() {
return static_cast<ClangImporter *>(
SIL.getASTContext().getClangModuleLoader())
->getTargetInfo()
.getDataLayout();
}
TypeExpansionContext IRGenModule::getMaximalTypeExpansionContext() const {
return TypeExpansionContext::maximal(getSwiftModule(),
getSILModule().isWholeModule());
}
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