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ca0091a445
that handle the 2/3 element cases specially. These are not actually optimized at the moment (they just call into swift_getTupleTypeMetadata) but this could be done at some point. This is a win for a couple reasons: this reduces the amount of code generated inline and it allows swift_getTupleTypeMetadata2/3 to be marked readnone, enabling CSE. As a driveby, optimize metadata refs of zero element tuples to directly use _TMdT_, eliminating a branch from swift_getTupleTypeMetadata. Swift SVN r5070
558 lines
22 KiB
C++
558 lines
22 KiB
C++
//===--- IRGenModule.cpp - Swift Global LLVM IR Generation ----------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements IR generation for global declarations in Swift.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/AST/ASTContext.h"
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#include "swift/AST/Module.h"
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#include "swift/AST/Diagnostics.h"
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#include "swift/IRGen/Options.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Type.h"
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#include "llvm/ADT/PointerUnion.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/SourceMgr.h"
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#include "GenType.h"
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#include "IRGenModule.h"
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#include "Linking.h"
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#include <initializer_list>
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using namespace swift;
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using namespace irgen;
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const unsigned DefaultAS = 0;
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/// A helper for creating LLVM struct types.
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static llvm::StructType *createStructType(IRGenModule &IGM,
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StringRef name,
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std::initializer_list<llvm::Type*> types) {
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return llvm::StructType::create(IGM.getLLVMContext(),
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ArrayRef<llvm::Type*>(types.begin(),
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types.size()),
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name);
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};
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/// A helper for creating pointer-to-struct types.
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static llvm::PointerType *createStructPointerType(IRGenModule &IGM,
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StringRef name,
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std::initializer_list<llvm::Type*> types) {
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return createStructType(IGM, name, types)->getPointerTo(DefaultAS);
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};
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IRGenModule::IRGenModule(ASTContext &Context,
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Options &Opts, llvm::Module &Module,
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const llvm::DataLayout &DataLayout,
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SILModule *SILMod)
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: Context(Context), Opts(Opts),
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Module(Module), LLVMContext(Module.getContext()),
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DataLayout(DataLayout), SILMod(SILMod),
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Types(*new TypeConverter(*this)) {
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VoidTy = llvm::Type::getVoidTy(getLLVMContext());
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Int1Ty = llvm::Type::getInt1Ty(getLLVMContext());
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Int8Ty = llvm::Type::getInt8Ty(getLLVMContext());
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Int16Ty = llvm::Type::getInt16Ty(getLLVMContext());
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Int32Ty = llvm::Type::getInt32Ty(getLLVMContext());
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Int64Ty = llvm::Type::getInt64Ty(getLLVMContext());
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Int8PtrTy = llvm::Type::getInt8PtrTy(getLLVMContext());
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Int8PtrPtrTy = Int8PtrTy->getPointerTo(0);
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SizeTy = DataLayout.getIntPtrType(getLLVMContext(), /*addrspace*/ 0);
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RefCountedStructTy =
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llvm::StructType::create(getLLVMContext(), "swift.refcounted");
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RefCountedPtrTy = RefCountedStructTy->getPointerTo(/*addrspace*/ 0);
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RefCountedNull = llvm::ConstantPointerNull::get(RefCountedPtrTy);
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// A type metadata is the structure pointed to by the canonical
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// address point of a type metadata. This is at least one word, and
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// potentially more than that, past the start of the actual global
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// structure.
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TypeMetadataStructTy = createStructType(*this, "swift.type", {
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MetadataKindTy // MetadataKind Kind;
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});
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TypeMetadataPtrTy = TypeMetadataStructTy->getPointerTo(DefaultAS);
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// A tuple type metadata has a couple extra fields.
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auto tupleElementTy = createStructType(*this, "swift.tuple_element_type", {
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TypeMetadataPtrTy, // Metadata *Type;
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SizeTy // size_t Offset;
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});
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TupleTypeMetadataPtrTy = createStructPointerType(*this, "swift.tuple_type", {
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TypeMetadataStructTy, // (base)
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SizeTy, // size_t NumElements;
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Int8PtrTy, // const char *Labels;
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llvm::ArrayType::get(tupleElementTy, 0) // Element Elements[];
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});
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// A full type metadata is basically just an adjustment to the
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// address point of a type metadata. Resilience may cause
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// additional data to be laid out prior to this address point.
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FullTypeMetadataStructTy = createStructType(*this, "swift.full_type", {
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WitnessTablePtrTy,
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TypeMetadataStructTy
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});
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FullTypeMetadataPtrTy = FullTypeMetadataStructTy->getPointerTo(DefaultAS);
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// A metadata pattern is a structure from which generic type
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// metadata are allocated. We leave this struct type intentionally
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// opaque, because the compiler basically never needs to access
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// anything from one.
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TypeMetadataPatternStructTy =
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llvm::StructType::create(getLLVMContext(), "swift.type_pattern");
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TypeMetadataPatternPtrTy =
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TypeMetadataPatternStructTy->getPointerTo(DefaultAS);
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DeallocatingDtorTy = llvm::FunctionType::get(VoidTy, RefCountedPtrTy, false);
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llvm::Type *dtorPtrTy = DeallocatingDtorTy->getPointerTo();
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// A full heap metadata is basically just an additional small prefix
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// on a full metadata, used for metadata corresponding to heap
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// allocations.
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FullHeapMetadataStructTy =
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createStructType(*this, "swift.full_heapmetadata", {
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dtorPtrTy,
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WitnessTablePtrTy,
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TypeMetadataStructTy
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});
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FullHeapMetadataPtrTy = FullHeapMetadataStructTy->getPointerTo(DefaultAS);
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llvm::Type *refCountedElts[] = { TypeMetadataPtrTy, SizeTy };
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RefCountedStructTy->setBody(refCountedElts);
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PtrSize = Size(DataLayout.getPointerSize(DefaultAS));
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FunctionPairTy = createStructType(*this, "swift.function", {
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Int8PtrTy,
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RefCountedPtrTy
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});
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OpaquePtrTy = llvm::StructType::create(LLVMContext, "swift.opaque")
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->getPointerTo(DefaultAS);
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FixedBufferTy = nullptr;
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for (unsigned i = 0; i != NumValueWitnessFunctions; ++i)
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ValueWitnessTys[i] = nullptr;
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ObjCPtrTy = llvm::StructType::create(getLLVMContext(), "objc_object")
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->getPointerTo(DefaultAS);
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ObjCClassStructTy = llvm::StructType::create(LLVMContext, "objc_class");
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ObjCClassPtrTy = ObjCClassStructTy->getPointerTo(DefaultAS);
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llvm::Type *objcClassElts[] = {
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ObjCClassPtrTy,
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ObjCClassPtrTy,
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OpaquePtrTy,
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OpaquePtrTy,
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IntPtrTy
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};
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ObjCClassStructTy->setBody(objcClassElts);
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ObjCSuperStructTy = llvm::StructType::create(LLVMContext, "objc_super");
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ObjCSuperPtrTy = ObjCSuperStructTy->getPointerTo(DefaultAS);
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llvm::Type *objcSuperElts[] = {
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ObjCPtrTy,
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ObjCClassPtrTy
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};
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ObjCSuperStructTy->setBody(objcSuperElts);
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// TODO: use "tinycc" on platforms that support it
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RuntimeCC = llvm::CallingConv::C;
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}
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IRGenModule::~IRGenModule() {
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delete &Types;
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}
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/// Create a function using swift's runtime calling convention.
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static llvm::Constant *createRuntimeFunction(IRGenModule &IGM, StringRef name,
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llvm::FunctionType *fnType) {
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llvm::Constant *addr = IGM.Module.getOrInsertFunction(name, fnType);
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if (auto fn = dyn_cast<llvm::Function>(addr))
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fn->setCallingConv(IGM.RuntimeCC);
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return addr;
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}
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/// Create a readonly runtime function.
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///
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/// 'readonly' permits calls to this function to be removed, GVN'ed,
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/// and re-ordered, but not necessarily around writes to memory. It
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/// is a promise that the function has no side effects. We actually
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/// apply this attribute to functions that do have side effects, but
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/// those side effects are things like allocating a cache entry: that
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/// is, they are not visible outside of the abstraction of the
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/// function (except by e.g. monitoring memory usage). This is
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/// permitted, as it does not affect the validity of transformations.
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static llvm::Constant *createReadonlyRuntimeFunction(IRGenModule &IGM,
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StringRef name,
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llvm::FunctionType *fnType) {
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llvm::Constant *addr = createRuntimeFunction(IGM, name, fnType);
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if (auto fn = dyn_cast<llvm::Function>(addr)) {
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fn->setOnlyReadsMemory();
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}
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return addr;
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}
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/// Create a readnone runtime function.
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///
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/// 'readnone' is a stronger version of 'readonly'; it permits calls
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/// to this function to be removed, GVN'ed, and re-ordered regardless
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/// of any intervening writes to memory. It is an additional promise
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/// that the function does not depend on the current state of memory.
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/// We actually apply this attribute to functions that do depend on
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/// the current state of memory, but only when that memory is known to
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/// be immutable. This is permitted, as it does not affect the
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/// validity of transformations.
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///
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/// Note that functions like swift_getTupleMetadata which read values
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/// out of a local array cannot be marked 'readnone'.
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static llvm::Constant *createReadnoneRuntimeFunction(IRGenModule &IGM,
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StringRef name,
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llvm::FunctionType *fnType) {
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llvm::Constant *addr = createRuntimeFunction(IGM, name, fnType);
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if (auto fn = dyn_cast<llvm::Function>(addr)) {
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fn->setDoesNotAccessMemory();
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}
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return addr;
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}
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static llvm::Constant *getRuntimeFn(IRGenModule &IGM,
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llvm::Constant *&cache,
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char const *name,
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llvm::Constant *(*createFn)(IRGenModule &IGM,
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StringRef name,
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llvm::FunctionType *fnType),
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std::initializer_list<llvm::Type*> retTypes,
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std::initializer_list<llvm::Type*> argTypes)
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{
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if (cache)
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return cache;
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llvm::Type *retTy;
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if (retTypes.size() == 1)
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retTy = *retTypes.begin();
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else
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retTy = llvm::StructType::get(IGM.LLVMContext,
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{retTypes.begin(), retTypes.end()},
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/*packed*/ false);
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auto fnTy = llvm::FunctionType::get(retTy,
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{argTypes.begin(), argTypes.end()},
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/*isVararg*/ false);
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cache = createFn(IGM, name, fnTy);
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return cache;
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}
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llvm::Constant *IRGenModule::getAllocBoxFn() {
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// struct { RefCounted *box; void *value; } swift_allocBox(Metadata *type);
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return getRuntimeFn(*this, AllocBoxFn,
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"swift_allocBox", createRuntimeFunction,
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{ RefCountedPtrTy, OpaquePtrTy },
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{ TypeMetadataPtrTy });
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}
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llvm::Constant *IRGenModule::getAllocObjectFn() {
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// RefCounted *swift_allocObject(Metadata *type, size_t size, size_t align);
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return getRuntimeFn(*this, AllocObjectFn,
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"swift_allocObject", createRuntimeFunction,
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{ RefCountedPtrTy },
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{ TypeMetadataPtrTy, SizeTy, SizeTy });
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}
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llvm::Constant *IRGenModule::getDeallocObjectFn() {
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// void swift_deallocObject(RefCounted *obj, size_t size);
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return getRuntimeFn(*this, DeallocObjectFn,
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"swift_deallocObject", createRuntimeFunction,
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{ VoidTy },
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{ RefCountedPtrTy, SizeTy });
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}
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llvm::Constant *IRGenModule::getRawAllocFn() {
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/// void *swift_rawAlloc(SwiftAllocIndex index);
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return getRuntimeFn(*this, RawAllocFn,
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"swift_rawAlloc", createRuntimeFunction,
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{ Int8PtrTy },
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{ SizeTy });
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}
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llvm::Constant *IRGenModule::getRawDeallocFn() {
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/// void swift_rawDealloc(void *ptr, SwiftAllocIndex index);
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return getRuntimeFn(*this, RawDeallocFn,
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"swift_rawDealloc", createRuntimeFunction,
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{ VoidTy },
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{ Int8PtrTy, SizeTy });
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}
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llvm::Constant *IRGenModule::getSlowAllocFn() {
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/// void *swift_slowAlloc(size_t size, size_t flags);
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return getRuntimeFn(*this, SlowAllocFn,
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"swift_slowAlloc", createRuntimeFunction,
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{ Int8PtrTy },
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{ SizeTy, SizeTy });
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}
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llvm::Constant *IRGenModule::getSlowRawDeallocFn() {
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/// void swift_slowRawDealloc(void *ptr, size_t size);
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return getRuntimeFn(*this, SlowRawDeallocFn, "swift_slowRawDealloc",
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createRuntimeFunction,
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{ VoidTy },
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{ Int8PtrTy, SizeTy });
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}
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llvm::Constant *IRGenModule::getCopyPODFn() {
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/// void *swift_copyPOD(void *dest, void *src, Metadata *self);
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return getRuntimeFn(*this, CopyPODFn, "swift_copyPOD", createRuntimeFunction,
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{ OpaquePtrTy },
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{ OpaquePtrTy, OpaquePtrTy, TypeMetadataPtrTy });
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}
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llvm::Constant *IRGenModule::getDynamicCastClassFn() {
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// void *swift_dynamicCastClass(void*, void*);
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return getRuntimeFn(*this, DynamicCastClassFn, "swift_dynamicCastClass",
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createReadonlyRuntimeFunction,
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{ Int8PtrTy },
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{ Int8PtrTy, Int8PtrTy });
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}
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llvm::Constant *IRGenModule::getDynamicCastClassUnconditionalFn() {
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// void *swift_dynamicCastClassUnconditional(void*, void*);
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return getRuntimeFn(*this, DynamicCastClassUnconditionalFn, "swift_dynamicCastClassUnconditional",
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createReadonlyRuntimeFunction,
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{ Int8PtrTy },
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{ Int8PtrTy, Int8PtrTy });
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}
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llvm::Constant *IRGenModule::getDynamicCastFn() {
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// void *swift_dynamicCast(void*, void*);
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return getRuntimeFn(*this, DynamicCastFn, "swift_dynamicCast",
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createReadonlyRuntimeFunction,
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{ Int8PtrTy },
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{ Int8PtrTy, Int8PtrTy });
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}
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llvm::Constant *IRGenModule::getDynamicCastUnconditionalFn() {
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// void *swift_dynamicCastUnconditional(void*, void*);
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return getRuntimeFn(*this, DynamicCastUnconditionalFn, "swift_dynamicCastUnconditional",
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createReadonlyRuntimeFunction,
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{ Int8PtrTy },
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{ Int8PtrTy, Int8PtrTy });
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}
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llvm::Constant *IRGenModule::getRetainNoResultFn() {
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// void swift_retainNoResult(void *ptr);
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getRuntimeFn(*this, RetainNoResultFn, "swift_retain_noresult",
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createRuntimeFunction,
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{ VoidTy }, { RefCountedPtrTy });
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if (auto fn = dyn_cast<llvm::Function>(RetainNoResultFn))
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fn->setDoesNotCapture(1);
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return RetainNoResultFn;
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}
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llvm::Constant *IRGenModule::getReleaseFn() {
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// void swift_release(void *ptr);
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getRuntimeFn(*this, ReleaseFn, "swift_release",
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createRuntimeFunction,
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{ VoidTy }, { RefCountedPtrTy });
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if (auto fn = dyn_cast<llvm::Function>(ReleaseFn))
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fn->setDoesNotCapture(1);
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return ReleaseFn;
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}
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llvm::Constant *IRGenModule::getGetFunctionMetadataFn() {
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// type_metadata_t *swift_getFunctionMetadata(type_metadata_t *arg,
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// type_metadata_t *result);
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return getRuntimeFn(*this, GetFunctionMetadataFn, "swift_getFunctionMetadata",
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createReadnoneRuntimeFunction,
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{ TypeMetadataPtrTy },
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{ TypeMetadataPtrTy, TypeMetadataPtrTy });
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}
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llvm::Constant *IRGenModule::getGetGenericMetadataFn() {
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// type_metadata_t *swift_getGenericMetadata(type_metadata_pattern_t *pattern,
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// const void *arguments);
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return getRuntimeFn(*this, GetGenericMetadataFn, "swift_getGenericMetadata",
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createRuntimeFunction,
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{ TypeMetadataPtrTy },
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{ TypeMetadataPatternPtrTy, Int8PtrTy });
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}
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llvm::Constant *IRGenModule::getGetMetatypeMetadataFn() {
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// type_metadata_t *swift_getMetatypeMetadata(type_metadata_t *instanceTy);
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return getRuntimeFn(*this, GetMetatypeMetadataFn, "swift_getMetatypeMetadata",
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createReadnoneRuntimeFunction,
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{ TypeMetadataPtrTy },
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{ TypeMetadataPtrTy });
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}
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llvm::Constant *IRGenModule::getGetObjCClassMetadataFn() {
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// type_metadata_t *swift_getObjCClassMetadata(struct objc_class *theClass);
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return getRuntimeFn(*this, GetObjCClassMetadataFn, "swift_getObjCClassMetadata",
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createReadnoneRuntimeFunction,
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{ TypeMetadataPtrTy },
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{ TypeMetadataPtrTy });
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}
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llvm::Constant *IRGenModule::getStaticTypeofFn() {
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// type_metadata_t *swift_staticTypeof(opaque_t *obj, type_metadata_t *self);
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return getRuntimeFn(*this, StaticTypeofFn, "swift_staticTypeof",
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createReadnoneRuntimeFunction,
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{ TypeMetadataPtrTy },
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{ OpaquePtrTy, TypeMetadataPtrTy });
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}
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llvm::Constant *IRGenModule::getObjectTypeofFn() {
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// type_metadata_t *swift_objectTypeof(opaque_t *obj, type_metadata_t *self);
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return getRuntimeFn(*this, ObjectTypeofFn, "swift_objectTypeof",
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createRuntimeFunction,
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{ TypeMetadataPtrTy },
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{ OpaquePtrTy, TypeMetadataPtrTy });
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}
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llvm::Constant *IRGenModule::getObjCTypeofFn() {
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// type_metadata_t *swift_objcTypeof(opaque_t *obj, type_metadata_t *self);
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return getRuntimeFn(*this, ObjCTypeofFn, "swift_objcTypeof",
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createRuntimeFunction,
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{ TypeMetadataPtrTy },
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{ OpaquePtrTy, TypeMetadataPtrTy });
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}
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llvm::Constant *IRGenModule::getEmptyTupleMetadata() {
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if (EmptyTupleMetadata)
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return EmptyTupleMetadata;
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return EmptyTupleMetadata =
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Module.getOrInsertGlobal("_TMdT_",
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TypeMetadataPtrTy->getPointerElementType());
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}
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llvm::Constant *IRGenModule::getGetTupleMetadataFn() {
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// type_metadata_t *swift_getTupleMetadata(size_t numElements,
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// type_metadata_t * const *pattern,
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// const char *labels,
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// value_witness_table_t *proposed);
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return getRuntimeFn(*this, GetTupleMetadataFn, "swift_getTupleTypeMetadata",
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createReadonlyRuntimeFunction,
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{ TypeMetadataPtrTy },
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{
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SizeTy,
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TypeMetadataPtrTy->getPointerTo(0),
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Int8PtrTy,
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WitnessTablePtrTy
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});
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}
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llvm::Constant *IRGenModule::getGetTupleMetadata2Fn() {
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// type_metadata_t *swift_getTupleMetadata2(type_metadata_t *elt0,
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// type_metadata_t *elt1,
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// const char *labels,
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// value_witness_table_t *proposed);
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return getRuntimeFn(*this, GetTupleMetadata2Fn, "swift_getTupleTypeMetadata2",
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createReadnoneRuntimeFunction,
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{ TypeMetadataPtrTy },
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{
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|
TypeMetadataPtrTy,
|
|
TypeMetadataPtrTy,
|
|
Int8PtrTy,
|
|
WitnessTablePtrTy
|
|
});
|
|
}
|
|
|
|
llvm::Constant *IRGenModule::getGetTupleMetadata3Fn() {
|
|
// type_metadata_t *swift_getTupleMetadata3(type_metadata_t *elt0,
|
|
// type_metadata_t *elt1,
|
|
// type_metadata_t *elt2,
|
|
// type_metadata_t * const *pattern,
|
|
// const char *labels,
|
|
// value_witness_table_t *proposed);
|
|
return getRuntimeFn(*this, GetTupleMetadata3Fn, "swift_getTupleTypeMetadata3",
|
|
createReadnoneRuntimeFunction,
|
|
{ TypeMetadataPtrTy },
|
|
{
|
|
TypeMetadataPtrTy,
|
|
TypeMetadataPtrTy,
|
|
TypeMetadataPtrTy,
|
|
Int8PtrTy,
|
|
WitnessTablePtrTy
|
|
});
|
|
}
|
|
|
|
|
|
llvm::Constant *IRGenModule::getGetObjectClassFn() {
|
|
if (GetObjectClassFn) return GetObjectClassFn;
|
|
|
|
// Class object_getClass(id object);
|
|
// This is an Objective-C runtime function.
|
|
// We have to mark it readonly instead of readnone because isa-rewriting
|
|
// can have a noticeable effect here.
|
|
llvm::FunctionType *fnType =
|
|
llvm::FunctionType::get(TypeMetadataPtrTy, ObjCPtrTy, false);
|
|
GetObjectClassFn = Module.getOrInsertFunction("object_getClass", fnType);
|
|
if (auto fn = dyn_cast<llvm::Function>(GetObjectClassFn))
|
|
fn->setOnlyReadsMemory();
|
|
return GetObjectClassFn;
|
|
}
|
|
|
|
llvm::Constant *IRGenModule::getGetObjectTypeFn() {
|
|
if (GetObjectTypeFn) return GetObjectTypeFn;
|
|
|
|
// type_metadata_t *swift_getObjectType(id object);
|
|
// Since this supposedly looks through dynamic subclasses, it's
|
|
// invariant across reasonable isa-rewriting schemes and therefore
|
|
// can be readnone.
|
|
llvm::FunctionType *fnType =
|
|
llvm::FunctionType::get(TypeMetadataPtrTy, ObjCPtrTy, false);
|
|
GetObjectTypeFn =
|
|
createReadnoneRuntimeFunction(*this, "swift_getObjectType", fnType);
|
|
return GetObjectTypeFn;
|
|
}
|
|
|
|
llvm::Constant *IRGenModule::getObjCEmptyCachePtr() {
|
|
if (ObjCEmptyCachePtr) return ObjCEmptyCachePtr;
|
|
|
|
// struct objc_cache _objc_empty_cache;
|
|
ObjCEmptyCachePtr = Module.getOrInsertGlobal("_objc_empty_cache",
|
|
OpaquePtrTy->getElementType());
|
|
return ObjCEmptyCachePtr;
|
|
}
|
|
|
|
llvm::Constant *IRGenModule::getObjCEmptyVTablePtr() {
|
|
if (ObjCEmptyVTablePtr) return ObjCEmptyVTablePtr;
|
|
|
|
// IMP _objc_empty_vtable;
|
|
if (Opts.UseJIT) {
|
|
ObjCEmptyVTablePtr = llvm::ConstantPointerNull::get(OpaquePtrTy);
|
|
} else {
|
|
ObjCEmptyVTablePtr = Module.getOrInsertGlobal("_objc_empty_vtable",
|
|
OpaquePtrTy->getElementType());
|
|
}
|
|
return ObjCEmptyVTablePtr;
|
|
}
|
|
|
|
llvm::Constant *IRGenModule::getSize(Size size) {
|
|
return llvm::ConstantInt::get(SizeTy, size.getValue());
|
|
}
|
|
|
|
void IRGenModule::unimplemented(SourceLoc loc, StringRef message) {
|
|
Context.Diags.diagnose(loc, diag::irgen_unimplemented, message);
|
|
}
|
|
|
|
void IRGenModule::error(SourceLoc loc, const Twine &message) {
|
|
SmallVector<char, 128> buffer;
|
|
Context.Diags.diagnose(loc, diag::irgen_failure,
|
|
message.toStringRef(buffer));
|
|
}
|