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GenHeap.cpp
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//===--- GenHeap.cpp - Layout of heap objects and their metadata ----------===//
//
// 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 routines for arbitrary Swift-native heap objects,
// such as layout and reference-counting.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Path.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Intrinsics.h"
#include "swift/Basic/Assertions.h"
#include "swift/Basic/SourceLoc.h"
#include "swift/ABI/MetadataValues.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/IRGenOptions.h"
#include "swift/SIL/SILModule.h"
#include "ClassTypeInfo.h"
#include "ConstantBuilder.h"
#include "Explosion.h"
#include "GenClass.h"
#include "GenMeta.h"
#include "GenPointerAuth.h"
#include "GenProto.h"
#include "GenType.h"
#include "HeapTypeInfo.h"
#include "IRGenDebugInfo.h"
#include "IRGenFunction.h"
#include "IRGenModule.h"
#include "IndirectTypeInfo.h"
#include "MetadataRequest.h"
#include "GenHeap.h"
using namespace swift;
using namespace irgen;
namespace {
#define NEVER_LOADABLE_CHECKED_REF_STORAGE_HELPER(Name, Nativeness) \
class Nativeness##Name##ReferenceTypeInfo \
: public IndirectTypeInfo<Nativeness##Name##ReferenceTypeInfo, \
FixedTypeInfo> { \
llvm::PointerIntPair<llvm::Type*, 1, bool> ValueTypeAndIsOptional; \
public: \
TypeLayoutEntry \
*buildTypeLayoutEntry(IRGenModule &IGM, \
SILType T, \
bool useStructLayouts) const override { \
if (!useStructLayouts) { \
return IGM.typeLayoutCache.getOrCreateTypeInfoBasedEntry(*this, T); \
} \
return IGM.typeLayoutCache.getOrCreateScalarEntry( \
*this, T, ScalarKind::Nativeness##Name##Reference); \
} \
Nativeness##Name##ReferenceTypeInfo(llvm::Type *valueType, \
llvm::Type *type, \
Size size, Alignment alignment, \
SpareBitVector &&spareBits, \
bool isOptional) \
: IndirectTypeInfo(type, size, std::move(spareBits), alignment, \
IsNotTriviallyDestroyable, IsNotBitwiseTakable, IsCopyable, IsFixedSize, IsABIAccessible), \
ValueTypeAndIsOptional(valueType, isOptional) {} \
void initializeWithCopy(IRGenFunction &IGF, Address destAddr, \
Address srcAddr, SILType T, \
bool isOutlined) const override { \
IGF.emit##Nativeness##Name##CopyInit(destAddr, srcAddr); \
} \
void initializeWithTake(IRGenFunction &IGF, Address destAddr, \
Address srcAddr, SILType T, \
bool isOutlined, bool zeroizeIfSensitive) const override { \
IGF.emit##Nativeness##Name##TakeInit(destAddr, srcAddr); \
} \
void assignWithCopy(IRGenFunction &IGF, Address destAddr, Address srcAddr, \
SILType T, bool isOutlined) const override { \
IGF.emit##Nativeness##Name##CopyAssign(destAddr, srcAddr); \
} \
void assignWithTake(IRGenFunction &IGF, Address destAddr, Address srcAddr, \
SILType T, bool isOutlined) const override { \
IGF.emit##Nativeness##Name##TakeAssign(destAddr, srcAddr); \
} \
void destroy(IRGenFunction &IGF, Address addr, SILType T, \
bool isOutlined) const override { \
IGF.emit##Nativeness##Name##Destroy(addr); \
} \
unsigned getFixedExtraInhabitantCount(IRGenModule &IGM) const override { \
auto count = IGM.getReferenceStorageExtraInhabitantCount( \
ReferenceOwnership::Name, \
ReferenceCounting::Nativeness); \
return count - ValueTypeAndIsOptional.getInt(); \
} \
APInt getFixedExtraInhabitantValue(IRGenModule &IGM, \
unsigned bits, \
unsigned index) const override { \
return IGM.getReferenceStorageExtraInhabitantValue(bits, \
index + ValueTypeAndIsOptional.getInt(), \
ReferenceOwnership::Name, \
ReferenceCounting::Nativeness); \
} \
llvm::Value *getExtraInhabitantIndex(IRGenFunction &IGF, Address src, \
SILType T, bool isOutlined) \
const override { \
return IGF.getReferenceStorageExtraInhabitantIndex(src, \
ReferenceOwnership::Name, \
ReferenceCounting::Nativeness); \
} \
void storeExtraInhabitant(IRGenFunction &IGF, llvm::Value *index, \
Address dest, SILType T, bool isOutlined) \
const override { \
return IGF.storeReferenceStorageExtraInhabitant(index, dest, \
ReferenceOwnership::Name, \
ReferenceCounting::Nativeness); \
} \
APInt getFixedExtraInhabitantMask(IRGenModule &IGM) const override { \
return IGM.getReferenceStorageExtraInhabitantMask( \
ReferenceOwnership::Name, \
ReferenceCounting::Nativeness); \
} \
llvm::Type *getOptionalIntType() const { \
return llvm::IntegerType::get( \
ValueTypeAndIsOptional.getPointer()->getContext(), \
getFixedSize().getValueInBits()); \
} \
};
#define ALWAYS_LOADABLE_CHECKED_REF_STORAGE_HELPER(Name, Nativeness) \
class Nativeness##Name##ReferenceTypeInfo \
: public SingleScalarTypeInfo<Nativeness##Name##ReferenceTypeInfo, \
LoadableTypeInfo> { \
llvm::PointerIntPair<llvm::Type*, 1, bool> ValueTypeAndIsOptional; \
public: \
Nativeness##Name##ReferenceTypeInfo(llvm::Type *valueType, \
llvm::Type *type, \
Size size, Alignment alignment, \
SpareBitVector &&spareBits, \
bool isOptional) \
: SingleScalarTypeInfo(type, size, std::move(spareBits), \
alignment, IsNotTriviallyDestroyable, \
IsCopyable, \
IsFixedSize, IsABIAccessible), \
ValueTypeAndIsOptional(valueType, isOptional) {} \
enum { IsScalarTriviallyDestroyable = false }; \
TypeLayoutEntry \
*buildTypeLayoutEntry(IRGenModule &IGM, \
SILType T, \
bool useStructLayouts) const override { \
if (!useStructLayouts) { \
return IGM.typeLayoutCache.getOrCreateTypeInfoBasedEntry(*this, T); \
} \
return IGM.typeLayoutCache.getOrCreateScalarEntry( \
*this, T, ScalarKind::Nativeness##Name##Reference); \
} \
llvm::Type *getScalarType() const { \
return ValueTypeAndIsOptional.getPointer(); \
} \
Address projectScalar(IRGenFunction &IGF, Address addr) const { \
return IGF.Builder.CreateElementBitCast(addr, getScalarType()); \
} \
void emitScalarRetain(IRGenFunction &IGF, llvm::Value *value, \
Atomicity atomicity) const { \
IGF.emit##Nativeness##Name##Retain(value, atomicity); \
} \
void emitScalarRelease(IRGenFunction &IGF, llvm::Value *value, \
Atomicity atomicity) const { \
IGF.emit##Nativeness##Name##Release(value, atomicity); \
} \
void emitScalarFixLifetime(IRGenFunction &IGF, llvm::Value *value) const { \
IGF.emitFixLifetime(value); \
} \
unsigned getFixedExtraInhabitantCount(IRGenModule &IGM) const override { \
auto count = IGM.getReferenceStorageExtraInhabitantCount( \
ReferenceOwnership::Name, \
ReferenceCounting::Nativeness); \
return count - ValueTypeAndIsOptional.getInt(); \
} \
APInt getFixedExtraInhabitantValue(IRGenModule &IGM, \
unsigned bits, \
unsigned index) const override { \
return IGM.getReferenceStorageExtraInhabitantValue(bits, \
index + ValueTypeAndIsOptional.getInt(), \
ReferenceOwnership::Name, \
ReferenceCounting::Nativeness); \
} \
llvm::Value *getExtraInhabitantIndex(IRGenFunction &IGF, Address src, \
SILType T, bool isOutlined) \
const override { \
return IGF.getReferenceStorageExtraInhabitantIndex(src, \
ReferenceOwnership::Name, \
ReferenceCounting::Nativeness); \
} \
void storeExtraInhabitant(IRGenFunction &IGF, llvm::Value *index, \
Address dest, SILType T, bool isOutlined) \
const override { \
return IGF.storeReferenceStorageExtraInhabitant(index, dest, \
ReferenceOwnership::Name, \
ReferenceCounting::Nativeness); \
} \
APInt getFixedExtraInhabitantMask(IRGenModule &IGM) const override { \
return IGM.getReferenceStorageExtraInhabitantMask( \
ReferenceOwnership::Name, \
ReferenceCounting::Nativeness); \
} \
};
// The nativeness of a reference storage type is a policy decision.
// Please also see the related ALWAYS_NATIVE and SOMETIMES_UNKNOWN macros
// later in this file that expand to the following boilerplate:
// TypeConverter::create##Name##StorageType
NEVER_LOADABLE_CHECKED_REF_STORAGE_HELPER(Weak, Native)
NEVER_LOADABLE_CHECKED_REF_STORAGE_HELPER(Weak, Unknown)
NEVER_LOADABLE_CHECKED_REF_STORAGE_HELPER(Unowned, Unknown)
ALWAYS_LOADABLE_CHECKED_REF_STORAGE_HELPER(Unowned, Native)
#undef NEVER_LOADABLE_CHECKED_REF_STORAGE_HELPER
#undef ALWAYS_LOADABLE_CHECKED_REF_STORAGE_HELPER
#define UNCHECKED_REF_STORAGE(Name, ...) \
class Name##ReferenceTypeInfo \
: public PODSingleScalarTypeInfo<Name##ReferenceTypeInfo, \
LoadableTypeInfo> { \
bool IsOptional; \
public: \
Name##ReferenceTypeInfo(llvm::Type *type, \
const SpareBitVector &spareBits, \
Size size, Alignment alignment, bool isOptional) \
: PODSingleScalarTypeInfo(type, size, spareBits, alignment), \
IsOptional(isOptional) {} \
/* Static types have the same spare bits as managed heap objects. */ \
unsigned getFixedExtraInhabitantCount(IRGenModule &IGM) const override { \
return getHeapObjectExtraInhabitantCount(IGM) - IsOptional; \
} \
APInt getFixedExtraInhabitantValue(IRGenModule &IGM, \
unsigned bits, \
unsigned index) const override { \
return getHeapObjectFixedExtraInhabitantValue(IGM, bits, \
index + IsOptional, 0); \
} \
llvm::Value *getExtraInhabitantIndex(IRGenFunction &IGF, Address src, \
SILType T, bool isOutlined) \
const override { \
return getHeapObjectExtraInhabitantIndex(IGF, src); \
} \
void storeExtraInhabitant(IRGenFunction &IGF, llvm::Value *index, \
Address dest, SILType T, bool isOutlined) \
const override { \
return storeHeapObjectExtraInhabitant(IGF, index, dest); \
} \
};
#include "swift/AST/ReferenceStorage.def"
} // end anonymous namespace
/// Produce a constant to place in a metatype's isa field
/// corresponding to the given metadata kind.
static llvm::ConstantInt *getMetadataKind(IRGenModule &IGM,
MetadataKind kind) {
return llvm::ConstantInt::get(IGM.MetadataKindTy, uint32_t(kind));
}
/// Perform the layout required for a heap object.
HeapLayout::HeapLayout(IRGenModule &IGM, LayoutStrategy strategy,
ArrayRef<SILType> fieldTypes,
ArrayRef<const TypeInfo *> fieldTypeInfos,
llvm::StructType *typeToFill,
NecessaryBindings &&bindings, unsigned bindingsIndex)
: StructLayout(IGM, /*type=*/std::nullopt, LayoutKind::HeapObject, strategy,
fieldTypeInfos, typeToFill),
ElementTypes(fieldTypes.begin(), fieldTypes.end()),
Bindings(std::move(bindings)), BindingsIndex(bindingsIndex) {
#ifndef NDEBUG
assert(fieldTypeInfos.size() == fieldTypes.size()
&& "type infos don't match types");
if (!Bindings.empty()) {
assert(fieldTypeInfos.size() >= (bindingsIndex + 1) &&
"no field for bindings");
auto fixedBindingsField =
dyn_cast<FixedTypeInfo>(fieldTypeInfos[bindingsIndex]);
assert(fixedBindingsField
&& "bindings field is not fixed size");
assert(fixedBindingsField->getFixedSize()
== Bindings.getBufferSize(IGM)
&& fixedBindingsField->getFixedAlignment()
== IGM.getPointerAlignment()
&& "bindings field doesn't fit bindings");
}
#endif
}
static llvm::Value *calcInitOffset(swift::irgen::IRGenFunction &IGF,
unsigned int i,
const swift::irgen::HeapLayout &layout) {
llvm::Value *offset = nullptr;
if (i == 0) {
auto startOffset = layout.getHeaderSize();
offset = llvm::ConstantInt::get(IGF.IGM.SizeTy, startOffset.getValue());
return offset;
}
auto &prevElt = layout.getElement(i - 1);
auto prevType = layout.getElementTypes()[i - 1];
// Start calculating offsets from the last fixed-offset field.
Size lastFixedOffset = layout.getElement(i - 1).getByteOffsetDuringLayout();
if (auto *fixedType = dyn_cast<FixedTypeInfo>(&prevElt.getType())) {
// If the last fixed-offset field is also fixed-size, we can
// statically compute the end of the fixed-offset fields.
auto fixedEnd = lastFixedOffset + fixedType->getFixedSize();
offset = llvm::ConstantInt::get(IGF.IGM.SizeTy, fixedEnd.getValue());
} else {
// Otherwise, we need to add the dynamic size to the fixed start
// offset.
offset = llvm::ConstantInt::get(IGF.IGM.SizeTy, lastFixedOffset.getValue());
offset = IGF.Builder.CreateAdd(
offset, prevElt.getType().getSize(IGF, prevType));
}
return offset;
}
HeapNonFixedOffsets::HeapNonFixedOffsets(IRGenFunction &IGF,
const HeapLayout &layout) {
if (!layout.isFixedLayout()) {
// Calculate all the non-fixed layouts.
// TODO: We could be lazier about this.
llvm::Value *offset = nullptr;
llvm::Value *totalAlign = llvm::ConstantInt::get(IGF.IGM.SizeTy,
layout.getAlignment().getMaskValue());
for (unsigned i : indices(layout.getElements())) {
auto &elt = layout.getElement(i);
auto eltTy = layout.getElementTypes()[i];
switch (elt.getKind()) {
case ElementLayout::Kind::InitialNonFixedSize:
// Factor the non-fixed-size field's alignment into the total alignment.
totalAlign = IGF.Builder.CreateOr(totalAlign,
elt.getType().getAlignmentMask(IGF, eltTy));
LLVM_FALLTHROUGH;
case ElementLayout::Kind::Empty:
case ElementLayout::Kind::EmptyTailAllocatedCType:
case ElementLayout::Kind::Fixed:
// Don't need to dynamically calculate this offset.
Offsets.push_back(nullptr);
break;
case ElementLayout::Kind::NonFixed:
// Start calculating non-fixed offsets from the end of the first fixed
// field.
if (!offset) {
offset = calcInitOffset(IGF, i, layout);
}
// Round up to alignment to get the offset.
auto alignMask = elt.getType().getAlignmentMask(IGF, eltTy);
auto notAlignMask = IGF.Builder.CreateNot(alignMask);
offset = IGF.Builder.CreateAdd(offset, alignMask);
offset = IGF.Builder.CreateAnd(offset, notAlignMask);
Offsets.push_back(offset);
// Advance by the field's size to start the next field.
offset = IGF.Builder.CreateAdd(offset,
elt.getType().getSize(IGF, eltTy));
totalAlign = IGF.Builder.CreateOr(totalAlign, alignMask);
break;
}
}
TotalSize = offset;
TotalAlignMask = totalAlign;
} else {
TotalSize = layout.emitSize(IGF.IGM);
TotalAlignMask = layout.emitAlignMask(IGF.IGM);
}
}
void irgen::emitDeallocateHeapObject(IRGenFunction &IGF,
llvm::Value *object,
llvm::Value *size,
llvm::Value *alignMask) {
// FIXME: We should call a fast deallocator for heap objects with
// known size.
IGF.Builder.CreateCall(IGF.IGM.getDeallocObjectFunctionPointer(),
{object, size, alignMask});
}
void emitDeallocateUninitializedHeapObject(IRGenFunction &IGF,
llvm::Value *object,
llvm::Value *size,
llvm::Value *alignMask) {
IGF.Builder.CreateCall(IGF.IGM.getDeallocUninitializedObjectFunctionPointer(),
{object, size, alignMask});
}
void irgen::emitDeallocateClassInstance(IRGenFunction &IGF,
llvm::Value *object,
llvm::Value *size,
llvm::Value *alignMask) {
// FIXME: We should call a fast deallocator for heap objects with
// known size.
IGF.Builder.CreateCall(IGF.IGM.getDeallocClassInstanceFunctionPointer(),
{object, size, alignMask});
}
void irgen::emitDeallocatePartialClassInstance(IRGenFunction &IGF,
llvm::Value *object,
llvm::Value *metadata,
llvm::Value *size,
llvm::Value *alignMask) {
// FIXME: We should call a fast deallocator for heap objects with
// known size.
IGF.Builder.CreateCall(
IGF.IGM.getDeallocPartialClassInstanceFunctionPointer(),
{object, metadata, size, alignMask});
}
/// Create the destructor function for a layout.
/// TODO: give this some reasonable name and possibly linkage.
static llvm::Function *createDtorFn(IRGenModule &IGM,
const HeapLayout &layout) {
llvm::Function *fn =
llvm::Function::Create(IGM.DeallocatingDtorTy,
llvm::Function::PrivateLinkage,
"objectdestroy", &IGM.Module);
auto attrs = IGM.constructInitialAttributes();
IGM.addSwiftSelfAttributes(attrs, 0);
fn->setAttributes(attrs);
fn->setCallingConv(IGM.SwiftCC);
IRGenFunction IGF(IGM, fn);
if (IGM.DebugInfo)
IGM.DebugInfo->emitArtificialFunction(IGF, fn);
Address structAddr = layout.emitCastTo(IGF, &*fn->arg_begin());
// Bind necessary bindings, if we have them.
if (layout.hasBindings()) {
// The type metadata bindings should be at a fixed offset, so we can pass
// None for NonFixedOffsets. If we didn't, we'd have a chicken-egg problem.
auto bindingsAddr = layout.getElement(layout.getBindingsIndex())
.project(IGF, structAddr, std::nullopt);
layout.getBindings().restore(IGF, bindingsAddr, MetadataState::Complete);
}
// Figure out the non-fixed offsets.
HeapNonFixedOffsets offsets(IGF, layout);
// Destroy the fields.
for (unsigned i : indices(layout.getElements())) {
auto &field = layout.getElement(i);
auto fieldTy = layout.getElementTypes()[i];
if (field.isTriviallyDestroyable())
continue;
field.getType().destroy(
IGF, field.project(IGF, structAddr, offsets), fieldTy,
true /*Called from metadata constructors: must be outlined*/);
}
emitDeallocateHeapObject(IGF, &*fn->arg_begin(), offsets.getSize(),
offsets.getAlignMask());
IGF.Builder.CreateRetVoid();
return fn;
}
/// Create the size function for a layout.
/// TODO: give this some reasonable name and possibly linkage.
llvm::Constant *HeapLayout::createSizeFn(IRGenModule &IGM) const {
llvm::Function *fn =
llvm::Function::Create(IGM.DeallocatingDtorTy,
llvm::Function::PrivateLinkage,
"objectsize", &IGM.Module);
fn->setAttributes(IGM.constructInitialAttributes());
IRGenFunction IGF(IGM, fn);
if (IGM.DebugInfo)
IGM.DebugInfo->emitArtificialFunction(IGF, fn);
// Ignore the object pointer; we aren't a dynamically-sized array,
// so it's pointless.
llvm::Value *size = emitSize(IGM);
IGF.Builder.CreateRet(size);
return fn;
}
static llvm::Constant *buildPrivateMetadata(IRGenModule &IGM,
const HeapLayout &layout,
llvm::Constant *dtorFn,
llvm::Constant *captureDescriptor,
MetadataKind kind) {
// Build the fields of the private metadata.
ConstantInitBuilder builder(IGM);
// In embedded Swift, heap objects have a different, simple(r) layout:
// superclass pointer + destructor.
if (IGM.Context.LangOpts.hasFeature(Feature::Embedded)) {
auto fields = builder.beginStruct();
fields.addNullPointer(IGM.Int8PtrTy);
fields.addSignedPointer(dtorFn,
IGM.getOptions().PointerAuth.HeapDestructors,
PointerAuthEntity::Special::HeapDestructor);
llvm::GlobalVariable *var = fields.finishAndCreateGlobal(
"metadata", IGM.getPointerAlignment(), /*constant*/ true,
llvm::GlobalVariable::PrivateLinkage);
return var;
}
auto fields = builder.beginStruct(IGM.FullBoxMetadataStructTy);
fields.addSignedPointer(dtorFn, IGM.getOptions().PointerAuth.HeapDestructors,
PointerAuthEntity::Special::HeapDestructor);
fields.addNullPointer(IGM.WitnessTablePtrTy);
{
auto kindStruct = fields.beginStruct(IGM.TypeMetadataStructTy);
kindStruct.add(getMetadataKind(IGM, kind));
kindStruct.finishAndAddTo(fields);
}
// Figure out the offset to the first element, which is necessary to be able
// to polymorphically project as a generic box.
auto elements = layout.getElements();
Size offset;
if (!elements.empty()
&& elements[0].getKind() == ElementLayout::Kind::Fixed)
offset = elements[0].getByteOffset();
else
offset = Size(0);
fields.addInt32(offset.getValue());
fields.add(captureDescriptor);
llvm::GlobalVariable *var =
fields.finishAndCreateGlobal("metadata",
IGM.getPointerAlignment(),
/*constant*/ true,
llvm::GlobalVariable::PrivateLinkage);
llvm::Constant *indices[] = {
llvm::ConstantInt::get(IGM.Int32Ty, 0),
llvm::ConstantInt::get(IGM.Int32Ty, 2)
};
return llvm::ConstantExpr::getInBoundsGetElementPtr(var->getValueType(), var,
indices);
}
llvm::Constant *
HeapLayout::getPrivateMetadata(IRGenModule &IGM,
llvm::Constant *captureDescriptor) const {
if (!privateMetadata)
privateMetadata = buildPrivateMetadata(IGM, *this, createDtorFn(IGM, *this),
captureDescriptor,
MetadataKind::HeapLocalVariable);
return privateMetadata;
}
llvm::Value *IRGenFunction::emitUnmanagedAlloc(const HeapLayout &layout,
const llvm::Twine &name,
llvm::Constant *captureDescriptor,
const HeapNonFixedOffsets *offsets) {
if (layout.isKnownEmpty()
&& layout.isTriviallyDestroyable()) {
return IGM.RefCountedNull;
}
llvm::Value *metadata = layout.getPrivateMetadata(IGM, captureDescriptor);
llvm::Value *size, *alignMask;
if (offsets) {
size = offsets->getSize();
alignMask = offsets->getAlignMask();
} else {
size = layout.emitSize(IGM);
alignMask = layout.emitAlignMask(IGM);
}
return emitAllocObjectCall(metadata, size, alignMask, name);
}
namespace {
class BuiltinNativeObjectTypeInfo
: public HeapTypeInfo<BuiltinNativeObjectTypeInfo> {
public:
BuiltinNativeObjectTypeInfo(llvm::PointerType *storage,
Size size, SpareBitVector spareBits,
Alignment align)
: HeapTypeInfo(ReferenceCounting::Native, storage, size, spareBits,
align) {}
/// Builtin.NativeObject uses Swift native reference-counting.
ReferenceCounting getReferenceCounting() const {
return ReferenceCounting::Native;
}
};
} // end anonymous namespace
const LoadableTypeInfo *TypeConverter::convertBuiltinNativeObject() {
return new BuiltinNativeObjectTypeInfo(IGM.RefCountedPtrTy,
IGM.getPointerSize(),
IGM.getHeapObjectSpareBits(),
IGM.getPointerAlignment());
}
unsigned IRGenModule::getReferenceStorageExtraInhabitantCount(
ReferenceOwnership ownership,
ReferenceCounting style) const {
switch (style) {
case ReferenceCounting::Native:
#define NEVER_LOADABLE_CHECKED_REF_STORAGE(Name, ...) \
if (ownership == ReferenceOwnership::Name) \
break;
#include "swift/AST/ReferenceStorage.def"
if (ObjCInterop)
break;
return getHeapObjectExtraInhabitantCount(*this);
case ReferenceCounting::Block:
case ReferenceCounting::ObjC:
case ReferenceCounting::None:
case ReferenceCounting::Unknown:
case ReferenceCounting::Custom:
break;
case ReferenceCounting::Bridge:
case ReferenceCounting::Error:
llvm_unreachable("Unsupported reference-counting style");
}
// The default behavior uses pointer semantics, therefore null is the only
// extra inhabitant allowed.
return 1;
}
SpareBitVector IRGenModule::getReferenceStorageSpareBits(
ReferenceOwnership ownership,
ReferenceCounting style) const {
// We have to be conservative (even with native reference-counting) in order
// to interoperate with code that might be working more generically with the
// memory/type.
switch (style) {
case ReferenceCounting::Native:
#define NEVER_LOADABLE_CHECKED_REF_STORAGE(Name, ...) \
if (ownership == ReferenceOwnership::Name) \
break;
#include "swift/AST/ReferenceStorage.def"
if (ObjCInterop)
break;
return getHeapObjectSpareBits();
case ReferenceCounting::Block:
case ReferenceCounting::ObjC:
case ReferenceCounting::None:
case ReferenceCounting::Custom:
case ReferenceCounting::Unknown:
break;
case ReferenceCounting::Bridge:
case ReferenceCounting::Error:
llvm_unreachable("Unsupported reference-counting style");
}
// The default behavior uses pointer semantics.
return SpareBitVector::getConstant(getPointerSize().getValueInBits(), false);
}
APInt IRGenModule::getReferenceStorageExtraInhabitantValue(unsigned bits,
unsigned index,
ReferenceOwnership ownership,
ReferenceCounting style) const {
// We have to be conservative (even with native reference-counting) in order
// to interoperate with code that might be working more generically with the
// memory/type.
switch (style) {
case ReferenceCounting::Native:
#define NEVER_LOADABLE_CHECKED_REF_STORAGE(Name, ...) \
if (ownership == ReferenceOwnership::Name) \
break;
#include "swift/AST/ReferenceStorage.def"
if (ObjCInterop)
break;
return getHeapObjectFixedExtraInhabitantValue(*this, bits, index, 0);
case ReferenceCounting::Block:
case ReferenceCounting::ObjC:
case ReferenceCounting::None:
case ReferenceCounting::Custom:
case ReferenceCounting::Unknown:
break;
case ReferenceCounting::Bridge:
case ReferenceCounting::Error:
llvm_unreachable("Unsupported reference-counting style");
}
// The default behavior allows for only one legal extra inhabitant, therefore
// this must be the null pattern.
assert(index == 0);
return APInt(bits, 0);
}
APInt IRGenModule::getReferenceStorageExtraInhabitantMask(
ReferenceOwnership ownership,
ReferenceCounting style) const {
switch (style) {
case ReferenceCounting::Native:
case ReferenceCounting::Block:
case ReferenceCounting::ObjC:
case ReferenceCounting::None:
case ReferenceCounting::Custom:
case ReferenceCounting::Unknown:
break;
case ReferenceCounting::Bridge:
case ReferenceCounting::Error:
llvm_unreachable("Unsupported reference-counting style");
}
return APInt::getAllOnes(getPointerSize().getValueInBits());
}
llvm::Value *IRGenFunction::getReferenceStorageExtraInhabitantIndex(Address src,
ReferenceOwnership ownership,
ReferenceCounting style) {
switch (style) {
case ReferenceCounting::Native:
if (IGM.ObjCInterop)
break;
return getHeapObjectExtraInhabitantIndex(*this, src);
case ReferenceCounting::Block:
case ReferenceCounting::ObjC:
case ReferenceCounting::None:
case ReferenceCounting::Custom:
case ReferenceCounting::Unknown:
break;
case ReferenceCounting::Bridge:
case ReferenceCounting::Error:
llvm_unreachable("Unsupported reference-counting style");
}
// The default behavior allows for only one legal extra inhabitant, therefore
// this must be the null pattern.
auto PtrTy =
#define CHECKED_REF_STORAGE(Name, ...) \
ownership == ReferenceOwnership::Name ? IGM.Name##ReferencePtrTy :
#include "swift/AST/ReferenceStorage.def"
nullptr;
(void)PtrTy;
assert(src.getAddress()->getType() == PtrTy);
src = Builder.CreateStructGEP(src, 0, Size(0));
llvm::Value *ptr = Builder.CreateLoad(src);
llvm::Value *isNull = Builder.CreateIsNull(ptr);
llvm::Value *result =
Builder.CreateSelect(isNull, Builder.getInt32(0),
llvm::ConstantInt::getSigned(IGM.Int32Ty, -1));
return result;
}
void IRGenFunction::storeReferenceStorageExtraInhabitant(llvm::Value *index,
Address dest,
ReferenceOwnership ownership,
ReferenceCounting style) {
switch (style) {
case ReferenceCounting::Native:
if (IGM.ObjCInterop)
break;
return storeHeapObjectExtraInhabitant(*this, index, dest);
case ReferenceCounting::Block:
case ReferenceCounting::ObjC:
case ReferenceCounting::None:
case ReferenceCounting::Custom:
case ReferenceCounting::Unknown:
break;
case ReferenceCounting::Bridge:
case ReferenceCounting::Error:
llvm_unreachable("Unsupported reference-counting style");
}
// The default behavior allows for only one legal extra inhabitant, therefore
// this must be the null pattern.
auto PtrTy =
#define CHECKED_REF_STORAGE(Name, ...) \
ownership == ReferenceOwnership::Name ? IGM.Name##ReferencePtrTy :
#include "swift/AST/ReferenceStorage.def"
nullptr;
(void)PtrTy;
assert(dest.getAddress()->getType() == PtrTy);
dest = Builder.CreateStructGEP(dest, 0, Size(0));
llvm::Value *null = llvm::ConstantPointerNull::get(IGM.RefCountedPtrTy);
Builder.CreateStore(null, dest);
}
#define SOMETIMES_UNKNOWN(Name) \
const TypeInfo *TypeConverter::create##Name##StorageType( \
llvm::Type *valueType, ReferenceCounting style, bool isOptional) { \
auto &&spareBits = \
IGM.getReferenceStorageSpareBits(ReferenceOwnership::Name, style); \
switch (style) { \
case ReferenceCounting::Native: \
return new Native##Name##ReferenceTypeInfo( \
valueType, IGM.Name##ReferenceStructTy, IGM.getPointerSize(), \
IGM.getPointerAlignment(), std::move(spareBits), isOptional); \
case ReferenceCounting::ObjC: \
case ReferenceCounting::None: \
case ReferenceCounting::Custom: \
case ReferenceCounting::Block: \
case ReferenceCounting::Unknown: \
return new Unknown##Name##ReferenceTypeInfo( \
valueType, IGM.Name##ReferenceStructTy, IGM.getPointerSize(), \
IGM.getPointerAlignment(), std::move(spareBits), isOptional); \
case ReferenceCounting::Bridge: \
case ReferenceCounting::Error: \
llvm_unreachable("not supported!"); \
} \
llvm_unreachable("bad reference-counting style"); \
}
#define ALWAYS_NATIVE(Name) \
const TypeInfo * \
TypeConverter::create##Name##StorageType(llvm::Type *valueType, \
ReferenceCounting style, \
bool isOptional) { \
assert(style == ReferenceCounting::Native); \
auto &&spareBits = IGM.getReferenceStorageSpareBits( \
ReferenceOwnership::Name, \
ReferenceCounting::Native); \
return new Native##Name##ReferenceTypeInfo(valueType, \
IGM.Name##ReferencePtrTy->getElementType(), \
IGM.getPointerSize(), \
IGM.getPointerAlignment(), \
std::move(spareBits), \
isOptional); \
}
// Always native versus "sometimes unknown" reference storage type policy:
SOMETIMES_UNKNOWN(Weak)
SOMETIMES_UNKNOWN(Unowned)
#undef SOMETIMES_UNKNOWN
#undef ALWAYS_NATIVE
#define CHECKED_REF_STORAGE(Name, ...) \
static_assert(&TypeConverter::create##Name##StorageType != nullptr, \
"Missing reference storage type converter helper constructor");
#define UNCHECKED_REF_STORAGE(Name, ...) \
const TypeInfo * \
TypeConverter::create##Name##StorageType(llvm::Type *valueType, \
ReferenceCounting style, \
bool isOptional) { \
(void)style; /* unused */ \
return new Name##ReferenceTypeInfo(valueType, \
IGM.getHeapObjectSpareBits(), \
IGM.getPointerSize(), \
IGM.getPointerAlignment(), \
isOptional); \
}
#include "swift/AST/ReferenceStorage.def"
/// Does the given value superficially not require reference-counting?
static bool doesNotRequireRefCounting(llvm::Value *value) {
// Constants never require reference-counting.
return isa<llvm::ConstantPointerNull>(value);
}
/// Emit a unary call to perform a ref-counting operation.
///
/// \param fn - expected signature 'void (T)' or 'T (T)'
static void emitUnaryRefCountCall(IRGenFunction &IGF,
llvm::Constant *fn,
llvm::Value *value) {
auto fun = cast<llvm::Function>(fn);
auto cc = fun->getCallingConv();
// Instead of casting the input, we cast the function type.
// This tends to produce less IR, but might be evil.
auto fnType = cast<llvm::FunctionType>(fun->getValueType());
if (value->getType() != fnType->getParamType(0)) {
auto resultTy = fnType->getReturnType() == IGF.IGM.VoidTy
? IGF.IGM.VoidTy
: value->getType();
fnType = llvm::FunctionType::get(resultTy, value->getType(), false);
fn = llvm::ConstantExpr::getBitCast(fn, fnType->getPointerTo());
}
// Emit the call.
llvm::CallInst *call = IGF.Builder.CreateCallWithoutDbgLoc(fnType, fn, value);
if (fun && fun->hasParamAttribute(0, llvm::Attribute::Returned))
call->addParamAttr(0, llvm::Attribute::Returned);
call->setCallingConv(cc);
call->setDoesNotThrow();
}
/// Emit a copy-like call to perform a ref-counting operation.
///
/// \param fn - expected signature 'void (T, T)' or 'T (T, T)'
static void emitCopyLikeCall(IRGenFunction &IGF,
llvm::Constant *fn,
llvm::Value *dest,
llvm::Value *src) {
assert(dest->getType() == src->getType() &&
"type mismatch in binary refcounting operation");
auto fun = cast<llvm::Function>(fn);
auto cc = fun->getCallingConv();
// Instead of casting the inputs, we cast the function type.
// This tends to produce less IR, but might be evil.
auto fnType = cast<llvm::FunctionType>(fun->getValueType());
if (dest->getType() != fnType->getParamType(0)) {
llvm::Type *paramTypes[] = { dest->getType(), dest->getType() };
auto resultTy = fnType->getReturnType() == IGF.IGM.VoidTy ? IGF.IGM.VoidTy
: dest->getType();
fnType = llvm::FunctionType::get(resultTy, paramTypes, false);
fn = llvm::ConstantExpr::getBitCast(fn, fnType->getPointerTo());
}
// Emit the call.
llvm::CallInst *call =
IGF.Builder.CreateCallWithoutDbgLoc(fnType, fn, {dest, src});
if (fun && fun->hasParamAttribute(0, llvm::Attribute::Returned))
call->addParamAttr(0, llvm::Attribute::Returned);
call->setCallingConv(cc);
call->setDoesNotThrow();
}
/// Emit a call to a function with a loadWeak-like signature.
///
/// \param fn - expected signature 'T (Weak*)'
static llvm::Value *emitLoadWeakLikeCall(IRGenFunction &IGF,
llvm::Constant *fn,
llvm::Value *addr,
llvm::Type *resultType) {
assert((addr->getType() == IGF.IGM.WeakReferencePtrTy ||
addr->getType() == IGF.IGM.UnownedReferencePtrTy) &&
"address is not of a weak or unowned reference");
auto fun = cast<llvm::Function>(fn);
auto cc = fun->getCallingConv();
// Instead of casting the output, we cast the function type.
// This tends to produce less IR, but might be evil.
auto fnType = cast<llvm::FunctionType>(fun->getValueType());
if (resultType != fnType->getReturnType()) {
llvm::Type *paramTypes[] = { addr->getType() };
fnType = llvm::FunctionType::get(resultType, paramTypes, false);
fn = llvm::ConstantExpr::getBitCast(fn, fnType->getPointerTo());
}
// Emit the call.
llvm::CallInst *call = IGF.Builder.CreateCallWithoutDbgLoc(fnType, fn, addr);
call->setCallingConv(cc);
call->setDoesNotThrow();
return call;
}
/// Emit a call to a function with a storeWeak-like signature.
///
/// \param fn - expected signature 'void (Weak*, T)' or 'Weak* (Weak*, T)'
static void emitStoreWeakLikeCall(IRGenFunction &IGF,
llvm::Constant *fn,
llvm::Value *addr,
llvm::Value *value) {
assert((addr->getType() == IGF.IGM.WeakReferencePtrTy ||
addr->getType() == IGF.IGM.UnownedReferencePtrTy) &&
"address is not of a weak or unowned reference");
auto fun = cast<llvm::Function>(fn);
auto cc = fun->getCallingConv();
// Instead of casting the inputs, we cast the function type.
// This tends to produce less IR, but might be evil.
auto fnType = cast<llvm::FunctionType>(fun->getValueType());
if (value->getType() != fnType->getParamType(1)) {
llvm::Type *paramTypes[] = { addr->getType(), value->getType() };
auto resultTy = fnType->getReturnType() == IGF.IGM.VoidTy ? IGF.IGM.VoidTy
: addr->getType();
fnType = llvm::FunctionType::get(resultTy, paramTypes, false);
fn = llvm::ConstantExpr::getBitCast(fn, fnType->getPointerTo());
}
// Emit the call.
llvm::CallInst *call =
IGF.Builder.CreateCallWithoutDbgLoc(fnType, fn, {addr, value});
if (fun && fun->hasParamAttribute(0, llvm::Attribute::Returned))
call->addParamAttr(0, llvm::Attribute::Returned);
call->setCallingConv(cc);
call->setDoesNotThrow();
}
/// Emit a call to swift_retain.
void IRGenFunction::emitNativeStrongRetain(llvm::Value *value,
Atomicity atomicity) {
if (doesNotRequireRefCounting(value))
return;
// Make sure the input pointer is the right type.
if (value->getType() != IGM.RefCountedPtrTy)
value = Builder.CreateBitCast(value, IGM.RefCountedPtrTy);
// Emit the call.
llvm::CallInst *call = Builder.CreateCall(