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IRGenModule.cpp
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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/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/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/Frontend/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 "GenEnum.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,
IRGenOptions &Opts,
StringRef ModuleName) {
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.DisableFPElim = Opts.DisableFPElim;
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.DebugFlags;
break;
case IRGenDebugInfoFormat::CodeView:
CGO.EmitCodeView = true;
CGO.DebugCompilationDir = Opts.DebugCompilationDir;
// This actually contains the debug flags for codeview.
CGO.DwarfDebugFlags = Opts.DebugFlags;
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)
: 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);
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());
}
IRGenModule::~IRGenModule() {
destroyClangTypeConverter();
destroyMetadataLayoutMap();
delete &Types;
delete DebugInfo;
}
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 NoReturn = llvm::Attribute::NoReturn;
const auto NoUnwind = llvm::Attribute::NoUnwind;
const auto ZExt = llvm::Attribute::ZExt;
const auto FirstParamReturned = llvm::Attribute::Returned;
} // 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,
llvm::ArrayRef<llvm::Type*> retTypes,
llvm::ArrayRef<llvm::Type*> argTypes,
ArrayRef<Attribute::AttrKind> attrs) {
if (cache)
return cache;
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);
cache = Module.getOrInsertFunction(name, fnTy);
// Add any function attributes and set the calling convention.
if (auto fn = dyn_cast<llvm::Function>(cache)) {
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);
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, RETURNS, ARGS, ATTRS) \
FUNCTION_IMPL(ID, NAME, CC, 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, RETURNS, ARGS, ATTRS) \
llvm::Constant *IRGenModule::get##ID##Fn() { \
using namespace RuntimeConstants; \
return getRuntimeFn(Module, ID##Fn, #NAME, CC, 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()) \
cast<llvm::GlobalVariable>(NAME)->setDLLStorageClass( \
llvm::GlobalValue::DLLImportStorageClass); \
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());
if (useDllStorage())
cast<llvm::GlobalVariable>(ObjCEmptyCachePtr)
->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
} 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);
if (useDllStorage())
cast<llvm::GlobalVariable>(ObjCISAMaskPtr)
->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
}
return Address(ObjCISAMaskPtr, getPointerAlignment());
}
ModuleDecl *IRGenModule::getSwiftModule() const {
return IRGen.SIL.getSwiftModule();
}
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;
NominalTypeDecl *ConformingTy =
wt->getConformance()->getType()->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 (SILWitnessTable *wt = SIL.lookUpWitnessTable(Conf)) {
// Add it to the queue if it hasn't already been put there.
if (canEmitWitnessTableLazily(wt) &&
LazilyEmittedWitnessTables.insert(wt).second) {
LazyWitnessTables.push_back(wt);
}
}
}
void IRGenerator::addClassForEagerInitialization(ClassDecl *ClassDecl) {
if (!ClassDecl->getAttrs().hasAttribute<StaticInitializeObjCMetadataAttr>())
return;
// Exclude some classes where those attributes make no sense but could be set
// for some reason. Just to be on the safe side.
Type ClassTy = ClassDecl->getDeclaredType();
if (ClassTy->is<UnboundGenericType>())
return;
if (ClassTy->hasArchetype())
return;
if (ClassDecl->hasClangNode())
return;
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";
}
/// Construct initial function attributes from options.
void IRGenModule::constructInitialFnAttributes(llvm::AttrBuilder &Attrs,
OptimizationMode FuncOptMode) {
// Add DisableFPElim.
if (!IRGen.Opts.DisableFPElim) {
Attrs.addAttribute("no-frame-pointer-elim", "false");
} else {
Attrs.addAttribute("no-frame-pointer-elim", "true");
Attrs.addAttribute("no-frame-pointer-elim-non-leaf");
}
// 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::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_$";
appendEncodedName(os, name);
return os.str();
}
llvm::SmallString<32> getTargetDependentLibraryOption(const llvm::Triple &T,
StringRef library) {
llvm::SmallString<32> buffer;
if (T.isWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) {
bool quote = library.find(' ') != StringRef::npos;
buffer += "/DEFAULTLIB:";
if (quote)
buffer += '"';
buffer += library;
if (!library.endswith_lower(".lib"))
buffer += ".lib";
if (quote)
buffer += '"';
} else if (T.isPS4()) {
bool quote = library.find(' ') != StringRef::npos;
buffer += "\01";
if (quote)
buffer += '"';
buffer += library;
if (quote)
buffer += '"';
} else {
buffer += "-l";
buffer += library;
}
return buffer;
}
void IRGenModule::addLinkLibrary(const LinkLibrary &linkLib) {
llvm::LLVMContext &ctx = Module.getContext();
switch (linkLib.getKind()) {
case LibraryKind::Library: {
llvm::SmallString<32> opt =
getTargetDependentLibraryOption(Triple, linkLib.getName());
AutolinkEntries.push_back(
llvm::MDNode::get(ctx, llvm::MDString::get(ctx, opt)));
break;
}
case LibraryKind::Framework: {
// If we're supposed to disable autolinking of this framework, bail out.
auto &frameworks = IRGen.Opts.DisableAutolinkFrameworks;
if (std::find(frameworks.begin(), frameworks.end(), linkLib.getName())
!= frameworks.end())
return;
llvm::Metadata *args[] = {
llvm::MDString::get(ctx, "-framework"),
llvm::MDString::get(ctx, linkLib.getName())
};
AutolinkEntries.push_back(llvm::MDNode::get(ctx, args));
break;
}
}
if (linkLib.shouldForceLoad()) {
llvm::SmallString<64> buf;
encodeForceLoadSymbolName(buf, linkLib.getName());
auto ForceImportThunk =
Module.getOrInsertFunction(buf, llvm::FunctionType::get(VoidTy, false));
if (useDllStorage())
cast<llvm::GlobalValue>(ForceImportThunk)
->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
buf += "_$";
appendEncodedName(buf, IRGen.Opts.ModuleName);
if (!Module.getGlobalVariable(buf.str())) {
auto ref = new llvm::GlobalVariable(Module, ForceImportThunk->getType(),
/*isConstant=*/true,
llvm::GlobalValue::WeakAnyLinkage,
ForceImportThunk, buf.str());
ref->setVisibility(llvm::GlobalValue::HiddenVisibility);
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());
if ((TargetInfo.OutputObjectFormat == llvm::Triple::COFF &&
!Triple.isOSCygMing()) ||
TargetInfo.OutputObjectFormat == llvm::Triple::MachO || Triple.isPS4()) {