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GenStruct.cpp
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//===--- GenStruct.cpp - Swift IR Generation For 'struct' Types -----------===//
//
// 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 struct types.
//
//===----------------------------------------------------------------------===//
#include "GenStruct.h"
#include "swift/AST/ClangModuleLoader.h"
#include "swift/AST/Decl.h"
#include "swift/AST/IRGenOptions.h"
#include "swift/AST/Pattern.h"
#include "swift/AST/SemanticAttrs.h"
#include "swift/AST/SubstitutionMap.h"
#include "swift/AST/Types.h"
#include "swift/IRGen/Linking.h"
#include "swift/SIL/SILFunctionBuilder.h"
#include "swift/SIL/SILModule.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Attr.h"
#include "clang/AST/Decl.h"
#include "clang/AST/GlobalDecl.h"
#include "clang/AST/Mangle.h"
#include "clang/AST/RecordLayout.h"
#include "clang/CodeGen/CodeGenABITypes.h"
#include "clang/CodeGen/SwiftCallingConv.h"
#include "clang/Sema/Sema.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "GenDecl.h"
#include "GenMeta.h"
#include "GenRecord.h"
#include "GenType.h"
#include "IRGenFunction.h"
#include "IRGenModule.h"
#include "IndirectTypeInfo.h"
#include "MemberAccessStrategy.h"
#include "MetadataLayout.h"
#include "NonFixedTypeInfo.h"
#include "ResilientTypeInfo.h"
#include "Signature.h"
#include "StructMetadataVisitor.h"
#pragma clang diagnostic ignored "-Winconsistent-missing-override"
using namespace swift;
using namespace irgen;
/// The kinds of TypeInfos implementing struct types.
enum class StructTypeInfoKind {
LoadableStructTypeInfo,
FixedStructTypeInfo,
LoadableClangRecordTypeInfo,
AddressOnlyClangRecordTypeInfo,
NonFixedStructTypeInfo,
ResilientStructTypeInfo
};
static StructTypeInfoKind getStructTypeInfoKind(const TypeInfo &type) {
return (StructTypeInfoKind) type.getSubclassKind();
}
/// If this type has a CXXDestructorDecl, find it and return it. Otherwise,
/// return nullptr.
static clang::CXXDestructorDecl *getCXXDestructor(SILType type) {
auto *structDecl = type.getStructOrBoundGenericStruct();
if (!structDecl || !structDecl->getClangDecl())
return nullptr;
const clang::CXXRecordDecl *cxxRecordDecl =
dyn_cast<clang::CXXRecordDecl>(structDecl->getClangDecl());
if (!cxxRecordDecl)
return nullptr;
return cxxRecordDecl->getDestructor();
}
namespace {
class StructFieldInfo : public RecordField<StructFieldInfo> {
public:
StructFieldInfo(VarDecl *field, const TypeInfo &type)
: RecordField(type), Field(field) {}
/// The field.
VarDecl * const Field;
StringRef getFieldName() const {
return Field->getName().str();
}
SILType getType(IRGenModule &IGM, SILType T) const {
return T.getFieldType(Field, IGM.getSILModule(),
IGM.getMaximalTypeExpansionContext());
}
};
/// A field-info implementation for fields of Clang types.
class ClangFieldInfo : public RecordField<ClangFieldInfo> {
public:
ClangFieldInfo(VarDecl *swiftField, const ElementLayout &layout,
const TypeInfo &typeInfo)
: RecordField(typeInfo), Field(swiftField) {
completeFrom(layout);
}
ClangFieldInfo(VarDecl *swiftField, const ElementLayout &layout,
unsigned explosionBegin, unsigned explosionEnd)
: RecordField(layout, explosionBegin, explosionEnd),
Field(swiftField) {}
VarDecl *Field;
StringRef getFieldName() const {
if (Field) return Field->getName().str();
return "<unimported>";
}
SILType getType(IRGenModule &IGM, SILType T) const {
if (Field)
return T.getFieldType(Field, IGM.getSILModule(),
IGM.getMaximalTypeExpansionContext());
// The Swift-field-less cases use opaque storage, which is
// guaranteed to ignore the type passed to it.
return {};
}
};
/// A common base class for structs.
template <class Impl, class Base, class FieldInfoType = StructFieldInfo>
class StructTypeInfoBase :
public RecordTypeInfo<Impl, Base, FieldInfoType> {
using super = RecordTypeInfo<Impl, Base, FieldInfoType>;
protected:
template <class... As>
StructTypeInfoBase(StructTypeInfoKind kind, As &&...args)
: super(std::forward<As>(args)...) {
super::setSubclassKind((unsigned) kind);
}
using super::asImpl;
public:
const FieldInfoType &getFieldInfo(VarDecl *field) const {
// FIXME: cache the physical field index in the VarDecl.
for (auto &fieldInfo : asImpl().getFields()) {
if (fieldInfo.Field == field)
return fieldInfo;
}
llvm_unreachable("field not in struct?");
}
/// Given a full struct explosion, project out a single field.
virtual void projectFieldFromExplosion(IRGenFunction &IGF, Explosion &in,
VarDecl *field,
Explosion &out) const {
auto &fieldInfo = getFieldInfo(field);
// If the field requires no storage, there's nothing to do.
if (fieldInfo.isEmpty())
return;
// Otherwise, project from the base.
auto fieldRange = fieldInfo.getProjectionRange();
auto elements = in.getRange(fieldRange.first, fieldRange.second);
out.add(elements);
}
/// Given the address of a struct value, project out the address of a
/// single field.
Address projectFieldAddress(IRGenFunction &IGF, Address addr, SILType T,
const FieldInfoType &field) const {
return asImpl().projectFieldAddress(IGF, addr, T, field.Field);
}
/// Given the address of a struct value, project out the address of a
/// single field.
Address projectFieldAddress(IRGenFunction &IGF, Address addr, SILType T,
VarDecl *field) const {
auto &fieldInfo = getFieldInfo(field);
if (fieldInfo.isEmpty())
return fieldInfo.getTypeInfo().getUndefAddress();
auto offsets = asImpl().getNonFixedOffsets(IGF, T);
return fieldInfo.projectAddress(IGF, addr, offsets);
}
/// Return the constant offset of a field as a Int32Ty, or nullptr if the
/// field is not at a fixed offset.
llvm::Constant *getConstantFieldOffset(IRGenModule &IGM,
VarDecl *field) const {
auto &fieldInfo = getFieldInfo(field);
if (fieldInfo.hasFixedByteOffset()) {
return llvm::ConstantInt::get(
IGM.Int32Ty, fieldInfo.getFixedByteOffset().getValue());
}
return nullptr;
}
const TypeInfo *getFieldTypeInfo(IRGenModule &IGM, VarDecl *field) const {
auto &fieldInfo = getFieldInfo(field);
if (fieldInfo.isEmpty())
return nullptr;
return &fieldInfo.getTypeInfo();
}
MemberAccessStrategy getFieldAccessStrategy(IRGenModule &IGM,
SILType T, VarDecl *field) const {
auto &fieldInfo = getFieldInfo(field);
switch (fieldInfo.getKind()) {
case ElementLayout::Kind::Fixed:
case ElementLayout::Kind::Empty:
case ElementLayout::Kind::EmptyTailAllocatedCType:
return MemberAccessStrategy::getDirectFixed(
fieldInfo.getFixedByteOffset());
case ElementLayout::Kind::InitialNonFixedSize:
return MemberAccessStrategy::getDirectFixed(Size(0));
case ElementLayout::Kind::NonFixed:
return asImpl().getNonFixedFieldAccessStrategy(IGM, T, fieldInfo);
}
llvm_unreachable("bad field layout kind");
}
unsigned getFieldIndex(IRGenModule &IGM, VarDecl *field) const {
auto &fieldInfo = getFieldInfo(field);
return fieldInfo.getStructIndex();
}
Optional<unsigned> getFieldIndexIfNotEmpty(IRGenModule &IGM,
VarDecl *field) const {
auto &fieldInfo = getFieldInfo(field);
if (fieldInfo.isEmpty())
return None;
return fieldInfo.getStructIndex();
}
bool isSingleRetainablePointer(ResilienceExpansion expansion,
ReferenceCounting *rc) const override {
auto fields = asImpl().getFields();
if (fields.size() != 1)
return false;
return fields[0].getTypeInfo().isSingleRetainablePointer(expansion, rc);
}
void verify(IRGenTypeVerifierFunction &IGF,
llvm::Value *metadata,
SILType structType) const override {
// Check that constant field offsets we know match
for (auto &field : asImpl().getFields()) {
switch (field.getKind()) {
case ElementLayout::Kind::Fixed: {
// We know the offset at compile time. See whether there's also an
// entry for this field in the field offset vector.
class FindOffsetOfFieldOffsetVector
: public StructMetadataScanner<FindOffsetOfFieldOffsetVector> {
public:
VarDecl *FieldToFind;
Size AddressPoint = Size::invalid();
Size FieldOffset = Size::invalid();
FindOffsetOfFieldOffsetVector(IRGenModule &IGM, VarDecl *Field)
: StructMetadataScanner<FindOffsetOfFieldOffsetVector>(
IGM, cast<StructDecl>(Field->getDeclContext())),
FieldToFind(Field) {}
void noteAddressPoint() {
AddressPoint = this->NextOffset;
}
void addFieldOffset(VarDecl *Field) {
if (Field == FieldToFind) {
FieldOffset = this->NextOffset;
}
StructMetadataScanner<
FindOffsetOfFieldOffsetVector>::addFieldOffset(Field);
}
};
FindOffsetOfFieldOffsetVector scanner(IGF.IGM, field.Field);
scanner.layout();
if (scanner.FieldOffset == Size::invalid()
|| scanner.AddressPoint == Size::invalid())
continue;
// Load the offset from the field offset vector and ensure it matches
// the compiler's idea of the offset.
auto metadataBytes =
IGF.Builder.CreateBitCast(metadata, IGF.IGM.Int8PtrTy);
auto fieldOffsetPtr = IGF.Builder.CreateInBoundsGEP(
IGF.IGM.Int8Ty, metadataBytes,
IGF.IGM.getSize(scanner.FieldOffset - scanner.AddressPoint));
fieldOffsetPtr =
IGF.Builder.CreateBitCast(fieldOffsetPtr,
IGF.IGM.Int32Ty->getPointerTo());
llvm::Value *fieldOffset = IGF.Builder.CreateLoad(
Address(fieldOffsetPtr, IGF.IGM.Int32Ty, Alignment(4)));
fieldOffset = IGF.Builder.CreateZExtOrBitCast(fieldOffset,
IGF.IGM.SizeTy);
IGF.verifyValues(metadata, fieldOffset,
IGF.IGM.getSize(field.getFixedByteOffset()),
Twine("offset of struct field ") + field.getFieldName());
break;
}
case ElementLayout::Kind::Empty:
case ElementLayout::Kind::EmptyTailAllocatedCType:
case ElementLayout::Kind::InitialNonFixedSize:
case ElementLayout::Kind::NonFixed:
continue;
}
}
}
};
/// A type implementation for loadable record types imported from Clang.
class LoadableClangRecordTypeInfo final
: public StructTypeInfoBase<LoadableClangRecordTypeInfo, LoadableTypeInfo,
ClangFieldInfo> {
const clang::RecordDecl *ClangDecl;
template <class Fn>
void forEachNonEmptyBase(Fn fn) const {
auto &layout = ClangDecl->getASTContext().getASTRecordLayout(ClangDecl);
if (auto cxxRecord = dyn_cast<clang::CXXRecordDecl>(ClangDecl)) {
for (auto base : cxxRecord->bases()) {
auto baseType = base.getType().getCanonicalType();
auto baseRecord = cast<clang::RecordType>(baseType)->getDecl();
auto baseCxxRecord = cast<clang::CXXRecordDecl>(baseRecord);
if (baseCxxRecord->isEmpty())
continue;
auto offset = layout.getBaseClassOffset(baseCxxRecord);
auto size =
ClangDecl->getASTContext().getTypeSizeInChars(baseType);
fn(baseType, offset, size);
}
}
}
public:
LoadableClangRecordTypeInfo(ArrayRef<ClangFieldInfo> fields,
unsigned explosionSize, llvm::Type *storageType,
Size size, SpareBitVector &&spareBits,
Alignment align,
const clang::RecordDecl *clangDecl)
: StructTypeInfoBase(StructTypeInfoKind::LoadableClangRecordTypeInfo,
fields, explosionSize, storageType, size,
std::move(spareBits), align, IsPOD, IsFixedSize),
ClangDecl(clangDecl) {}
TypeLayoutEntry *buildTypeLayoutEntry(IRGenModule &IGM,
SILType T) const override {
if (!IGM.getOptions().ForceStructTypeLayouts) {
return IGM.typeLayoutCache.getOrCreateScalarEntry(*this, T);
}
if (!areFieldsABIAccessible()) {
return IGM.typeLayoutCache.getOrCreateResilientEntry(T);
}
std::vector<TypeLayoutEntry *> fields;
for (auto &field : getFields()) {
auto fieldTy = field.getType(IGM, T);
fields.push_back(
field.getTypeInfo().buildTypeLayoutEntry(IGM, fieldTy));
}
assert(!fields.empty() &&
"Empty structs should not be LoadableClangRecordTypeInfo");
if (fields.size() == 1) {
return fields[0];
}
return IGM.typeLayoutCache.getOrCreateAlignedGroupEntry(fields, 1);
}
void initializeFromParams(IRGenFunction &IGF, Explosion ¶ms,
Address addr, SILType T,
bool isOutlined) const override {
LoadableClangRecordTypeInfo::initialize(IGF, params, addr, isOutlined);
}
void addToAggLowering(IRGenModule &IGM, SwiftAggLowering &lowering,
Size offset) const override {
forEachNonEmptyBase([&](clang::QualType type, clang::CharUnits offset,
clang::CharUnits) {
lowering.addTypedData(type, offset);
});
lowering.addTypedData(ClangDecl, offset.asCharUnits());
}
llvm::NoneType getNonFixedOffsets(IRGenFunction &IGF) const {
return None;
}
llvm::NoneType getNonFixedOffsets(IRGenFunction &IGF, SILType T) const {
return None;
}
MemberAccessStrategy
getNonFixedFieldAccessStrategy(IRGenModule &IGM, SILType T,
const ClangFieldInfo &field) const {
llvm_unreachable("non-fixed field in Clang type?");
}
};
class AddressOnlyClangRecordTypeInfo final
: public StructTypeInfoBase<AddressOnlyClangRecordTypeInfo, FixedTypeInfo,
ClangFieldInfo> {
const clang::RecordDecl *ClangDecl;
const clang::CXXConstructorDecl *findCopyConstructor() const {
const clang::CXXRecordDecl *cxxRecordDecl =
dyn_cast<clang::CXXRecordDecl>(ClangDecl);
if (!cxxRecordDecl)
return nullptr;
for (auto method : cxxRecordDecl->methods()) {
if (auto ctor = dyn_cast<clang::CXXConstructorDecl>(method)) {
if (ctor->isCopyConstructor())
return ctor;
}
}
return nullptr;
}
CanSILFunctionType createCXXCopyConstructorFunctionType(IRGenFunction &IGF,
SILType T) const {
// Create the following function type:
// @convention(c) (UnsafePointer<T>) -> @out T
// This is how clang *would* import the copy constructor. So, later, when
// we pass it to "emitCXXConstructorThunkIfNeeded" we get a thunk with
// the following LLVM function type:
// void (%struct.T* %this, %struct.T* %0)
auto ptrTypeDecl =
IGF.getSILModule().getASTContext().getUnsafePointerDecl();
auto subst = SubstitutionMap::get(ptrTypeDecl->getGenericSignature(),
{T.getASTType()},
ArrayRef<ProtocolConformanceRef>{});
auto ptrType = ptrTypeDecl->getDeclaredInterfaceType().subst(subst);
SILParameterInfo ptrParam(ptrType->getCanonicalType(),
ParameterConvention::Direct_Unowned);
SILResultInfo result(T.getASTType(), ResultConvention::Indirect);
return SILFunctionType::get(
GenericSignature(),
SILFunctionType::ExtInfo().withRepresentation(
SILFunctionTypeRepresentation::CFunctionPointer),
SILCoroutineKind::None,
/*callee=*/ParameterConvention::Direct_Unowned,
/*params*/ {ptrParam},
/*yields*/ {}, /*results*/ {result},
/*error*/ None,
/*pattern subs*/ SubstitutionMap(),
/*invocation subs*/ SubstitutionMap(), IGF.IGM.Context);
}
void emitCopyWithCopyConstructor(
IRGenFunction &IGF, SILType T,
const clang::CXXConstructorDecl *copyConstructor, llvm::Value *src,
llvm::Value *dest) const {
auto fnType = createCXXCopyConstructorFunctionType(IGF, T);
auto globalDecl =
clang::GlobalDecl(copyConstructor, clang::Ctor_Complete);
auto clangFnAddr =
IGF.IGM.getAddrOfClangGlobalDecl(globalDecl, NotForDefinition);
auto callee = cast<llvm::Function>(clangFnAddr->stripPointerCasts());
Signature signature = IGF.IGM.getSignature(fnType);
std::string name = "__swift_cxx_copy_ctor" + callee->getName().str();
clangFnAddr = emitCXXConstructorThunkIfNeeded(
IGF.IGM, signature, copyConstructor, name, clangFnAddr);
callee = cast<llvm::Function>(clangFnAddr);
dest = IGF.coerceValue(dest, callee->getFunctionType()->getParamType(0),
IGF.IGM.DataLayout);
src = IGF.coerceValue(src, callee->getFunctionType()->getParamType(1),
IGF.IGM.DataLayout);
IGF.Builder.CreateCall(callee->getFunctionType(), callee, {dest, src});
}
public:
AddressOnlyClangRecordTypeInfo(ArrayRef<ClangFieldInfo> fields,
llvm::Type *storageType, Size size,
Alignment align,
const clang::RecordDecl *clangDecl)
: StructTypeInfoBase(StructTypeInfoKind::AddressOnlyClangRecordTypeInfo,
fields, storageType, size,
// We can't assume any spare bits in a C++ type
// with user-defined special member functions.
SpareBitVector(llvm::Optional<APInt>{
llvm::APInt(size.getValueInBits(), 0)}),
align, IsNotPOD, IsNotBitwiseTakable, IsFixedSize),
ClangDecl(clangDecl) {
(void)ClangDecl;
}
void destroy(IRGenFunction &IGF, Address address, SILType T,
bool isOutlined) const override {
auto *destructor = getCXXDestructor(T);
// If the destructor is trivial, clang will assert when we call
// `emitCXXDestructorCall` so, just let Swift handle this destructor.
if (!destructor || destructor->isTrivial()) {
// If we didn't find a destructor to call, bail out to the parent
// implementation.
StructTypeInfoBase<AddressOnlyClangRecordTypeInfo, FixedTypeInfo,
ClangFieldInfo>::destroy(IGF, address, T,
isOutlined);
return;
}
if (!destructor->isUserProvided() &&
!destructor->doesThisDeclarationHaveABody()) {
assert(!destructor->isDeleted() &&
"Swift cannot handle a type with no known destructor.");
// Make sure we define the destructor so we have something to call.
auto &sema = IGF.IGM.Context.getClangModuleLoader()->getClangSema();
sema.DefineImplicitDestructor(clang::SourceLocation(), destructor);
}
clang::GlobalDecl destructorGlobalDecl(destructor, clang::Dtor_Complete);
auto *destructorFnAddr =
cast<llvm::Function>(IGF.IGM.getAddrOfClangGlobalDecl(
destructorGlobalDecl, NotForDefinition));
SmallVector<llvm::Value *, 2> args;
auto *thisArg = IGF.coerceValue(address.getAddress(),
destructorFnAddr->getArg(0)->getType(),
IGF.IGM.DataLayout);
args.push_back(thisArg);
llvm::Value *implicitParam =
clang::CodeGen::getCXXDestructorImplicitParam(
IGF.IGM.getClangCGM(), IGF.Builder.GetInsertBlock(),
IGF.Builder.GetInsertPoint(), destructor, clang::Dtor_Complete,
false, false);
if (implicitParam) {
implicitParam = IGF.coerceValue(implicitParam,
destructorFnAddr->getArg(1)->getType(),
IGF.IGM.DataLayout);
args.push_back(implicitParam);
}
IGF.Builder.CreateCall(destructorFnAddr->getFunctionType(),
destructorFnAddr, args);
}
TypeLayoutEntry *buildTypeLayoutEntry(IRGenModule &IGM,
SILType T) const override {
if (!IGM.getOptions().ForceStructTypeLayouts || getCXXDestructor(T) ||
!areFieldsABIAccessible()) {
return IGM.typeLayoutCache.getOrCreateScalarEntry(*this, T);
}
std::vector<TypeLayoutEntry *> fields;
for (auto &field : getFields()) {
auto fieldTy = field.getType(IGM, T);
fields.push_back(
field.getTypeInfo().buildTypeLayoutEntry(IGM, fieldTy));
}
assert(!fields.empty() &&
"Empty structs should not be AddressOnlyRecordTypeInfo");
if (fields.size() == 1) {
return fields[0];
}
return IGM.typeLayoutCache.getOrCreateAlignedGroupEntry(fields, 1);
}
void initializeFromParams(IRGenFunction &IGF, Explosion ¶ms,
Address addr, SILType T,
bool isOutlined) const override {
llvm_unreachable("Address-only C++ types must be created by C++ special "
"member functions.");
}
void initializeWithCopy(IRGenFunction &IGF, Address destAddr,
Address srcAddr, SILType T,
bool isOutlined) const override {
if (auto copyConstructor = findCopyConstructor()) {
emitCopyWithCopyConstructor(IGF, T, copyConstructor,
srcAddr.getAddress(),
destAddr.getAddress());
return;
}
StructTypeInfoBase<AddressOnlyClangRecordTypeInfo, FixedTypeInfo,
ClangFieldInfo>::initializeWithCopy(IGF, destAddr,
srcAddr, T,
isOutlined);
}
void assignWithCopy(IRGenFunction &IGF, Address destAddr, Address srcAddr,
SILType T, bool isOutlined) const override {
if (auto copyConstructor = findCopyConstructor()) {
emitCopyWithCopyConstructor(IGF, T, copyConstructor,
srcAddr.getAddress(),
destAddr.getAddress());
return;
}
StructTypeInfoBase<AddressOnlyClangRecordTypeInfo, FixedTypeInfo,
ClangFieldInfo>::assignWithCopy(IGF, destAddr,
srcAddr, T,
isOutlined);
}
void initializeWithTake(IRGenFunction &IGF, Address dest, Address src,
SILType T, bool isOutlined) const override {
if (auto copyConstructor = findCopyConstructor()) {
emitCopyWithCopyConstructor(IGF, T, copyConstructor,
src.getAddress(),
dest.getAddress());
destroy(IGF, src, T, isOutlined);
return;
}
StructTypeInfoBase<AddressOnlyClangRecordTypeInfo, FixedTypeInfo,
ClangFieldInfo>::initializeWithTake(IGF, dest,
src, T,
isOutlined);
}
void assignWithTake(IRGenFunction &IGF, Address dest, Address src, SILType T,
bool isOutlined) const override {
if (auto copyConstructor = findCopyConstructor()) {
emitCopyWithCopyConstructor(IGF, T, copyConstructor,
src.getAddress(),
dest.getAddress());
destroy(IGF, src, T, isOutlined);
return;
}
StructTypeInfoBase<AddressOnlyClangRecordTypeInfo, FixedTypeInfo,
ClangFieldInfo>::assignWithTake(IGF, dest,
src, T,
isOutlined);
}
llvm::NoneType getNonFixedOffsets(IRGenFunction &IGF) const { return None; }
llvm::NoneType getNonFixedOffsets(IRGenFunction &IGF, SILType T) const {
return None;
}
MemberAccessStrategy
getNonFixedFieldAccessStrategy(IRGenModule &IGM, SILType T,
const ClangFieldInfo &field) const {
llvm_unreachable("non-fixed field in Clang type?");
}
};
/// A type implementation for loadable struct types.
class LoadableStructTypeInfo final
: public StructTypeInfoBase<LoadableStructTypeInfo, LoadableTypeInfo> {
public:
LoadableStructTypeInfo(ArrayRef<StructFieldInfo> fields,
unsigned explosionSize,
llvm::Type *storageType, Size size,
SpareBitVector &&spareBits,
Alignment align, IsPOD_t isPOD,
IsFixedSize_t alwaysFixedSize)
: StructTypeInfoBase(StructTypeInfoKind::LoadableStructTypeInfo,
fields, explosionSize,
storageType, size, std::move(spareBits),
align, isPOD, alwaysFixedSize)
{}
void addToAggLowering(IRGenModule &IGM, SwiftAggLowering &lowering,
Size offset) const override {
for (auto &field : getFields()) {
auto fieldOffset = offset + field.getFixedByteOffset();
cast<LoadableTypeInfo>(field.getTypeInfo())
.addToAggLowering(IGM, lowering, fieldOffset);
}
}
TypeLayoutEntry *buildTypeLayoutEntry(IRGenModule &IGM,
SILType T) const override {
if (!IGM.getOptions().ForceStructTypeLayouts) {
return IGM.typeLayoutCache.getOrCreateScalarEntry(*this, T);
}
if (!areFieldsABIAccessible()) {
return IGM.typeLayoutCache.getOrCreateResilientEntry(T);
}
if (getFields().empty()) {
return IGM.typeLayoutCache.getEmptyEntry();
}
std::vector<TypeLayoutEntry *> fields;
for (auto &field : getFields()) {
auto fieldTy = field.getType(IGM, T);
fields.push_back(
field.getTypeInfo().buildTypeLayoutEntry(IGM, fieldTy));
}
if (fields.size() == 1) {
return fields[0];
}
return IGM.typeLayoutCache.getOrCreateAlignedGroupEntry(fields, 1);
}
void initializeFromParams(IRGenFunction &IGF, Explosion ¶ms,
Address addr, SILType T,
bool isOutlined) const override {
LoadableStructTypeInfo::initialize(IGF, params, addr, isOutlined);
}
llvm::NoneType getNonFixedOffsets(IRGenFunction &IGF) const {
return None;
}
llvm::NoneType getNonFixedOffsets(IRGenFunction &IGF, SILType T) const {
return None;
}
MemberAccessStrategy
getNonFixedFieldAccessStrategy(IRGenModule &IGM, SILType T,
const StructFieldInfo &field) const {
llvm_unreachable("non-fixed field in loadable type?");
}
};
/// A type implementation for non-loadable but fixed-size struct types.
class FixedStructTypeInfo final
: public StructTypeInfoBase<FixedStructTypeInfo,
IndirectTypeInfo<FixedStructTypeInfo,
FixedTypeInfo>> {
public:
// FIXME: Spare bits between struct members.
FixedStructTypeInfo(ArrayRef<StructFieldInfo> fields, llvm::Type *T,
Size size, SpareBitVector &&spareBits,
Alignment align, IsPOD_t isPOD, IsBitwiseTakable_t isBT,
IsFixedSize_t alwaysFixedSize)
: StructTypeInfoBase(StructTypeInfoKind::FixedStructTypeInfo,
fields, T, size, std::move(spareBits), align,
isPOD, isBT, alwaysFixedSize)
{}
TypeLayoutEntry *buildTypeLayoutEntry(IRGenModule &IGM,
SILType T) const override {
if (!IGM.getOptions().ForceStructTypeLayouts) {
return IGM.typeLayoutCache.getOrCreateScalarEntry(*this, T);
}
if (!areFieldsABIAccessible()) {
return IGM.typeLayoutCache.getOrCreateResilientEntry(T);
}
std::vector<TypeLayoutEntry *> fields;
for (auto &field : getFields()) {
auto fieldTy = field.getType(IGM, T);
fields.push_back(
field.getTypeInfo().buildTypeLayoutEntry(IGM, fieldTy));
}
assert(!fields.empty() &&
"Empty structs should not be FixedStructTypeInfo");
if (fields.size() == 1) {
return fields[0];
}
return IGM.typeLayoutCache.getOrCreateAlignedGroupEntry(fields, 1);
}
llvm::NoneType getNonFixedOffsets(IRGenFunction &IGF) const {
return None;
}
llvm::NoneType getNonFixedOffsets(IRGenFunction &IGF, SILType T) const {
return None;
}
MemberAccessStrategy
getNonFixedFieldAccessStrategy(IRGenModule &IGM, SILType T,
const StructFieldInfo &field) const {
llvm_unreachable("non-fixed field in fixed struct?");
}
};
/// Accessor for the non-fixed offsets of a struct type.
class StructNonFixedOffsets : public NonFixedOffsetsImpl {
SILType TheStruct;
public:
StructNonFixedOffsets(SILType type) : TheStruct(type) {
assert(TheStruct.getStructOrBoundGenericStruct());
}
llvm::Value *getOffsetForIndex(IRGenFunction &IGF, unsigned index) override {
auto &layout =
IGF.IGM.getMetadataLayout(TheStruct.getStructOrBoundGenericStruct());
auto offset = layout.getFieldOffset(
IGF, layout.getDecl()->getStoredProperties()[index]);
llvm::Value *metadata = IGF.emitTypeMetadataRefForLayout(TheStruct);
auto field = IGF.emitAddressAtOffset(metadata, offset, IGF.IGM.Int32Ty,
IGF.IGM.getPointerAlignment());
return IGF.Builder.CreateLoad(field);
}
MemberAccessStrategy getFieldAccessStrategy(IRGenModule &IGM,
unsigned nonFixedIndex) {
auto start =
IGM.getMetadataLayout(TheStruct.getStructOrBoundGenericStruct())
.getFieldOffsetVectorOffset();
// FIXME: Handle resilience
auto indirectOffset = start.getStatic() +
(IGM.getPointerSize() * nonFixedIndex);
return MemberAccessStrategy::getIndirectFixed(indirectOffset,
MemberAccessStrategy::OffsetKind::Bytes_Word);
}
};
/// A type implementation for non-fixed struct types.
class NonFixedStructTypeInfo final
: public StructTypeInfoBase<NonFixedStructTypeInfo,
WitnessSizedTypeInfo<NonFixedStructTypeInfo>>
{
public:
NonFixedStructTypeInfo(ArrayRef<StructFieldInfo> fields,
FieldsAreABIAccessible_t fieldsAccessible,
llvm::Type *T,
Alignment align,
IsPOD_t isPOD, IsBitwiseTakable_t isBT,
IsABIAccessible_t structAccessible)
: StructTypeInfoBase(StructTypeInfoKind::NonFixedStructTypeInfo,
fields, fieldsAccessible,
T, align, isPOD, isBT, structAccessible) {
}
TypeLayoutEntry *buildTypeLayoutEntry(IRGenModule &IGM,
SILType T) const override {
if (!areFieldsABIAccessible()) {
return IGM.typeLayoutCache.getOrCreateResilientEntry(T);
}
std::vector<TypeLayoutEntry *> fields;
for (auto &field : getFields()) {
auto fieldTy = field.getType(IGM, T);
fields.push_back(
field.getTypeInfo().buildTypeLayoutEntry(IGM, fieldTy));
}
assert(!fields.empty() &&
"Empty structs should not be NonFixedStructTypeInfo");
if (fields.size() == 1) {
return fields[0];
}
return IGM.typeLayoutCache.getOrCreateAlignedGroupEntry(fields, 1);
}
// We have an indirect schema.
void getSchema(ExplosionSchema &s) const override {
s.add(ExplosionSchema::Element::forAggregate(getStorageType(),
getBestKnownAlignment()));
}
StructNonFixedOffsets
getNonFixedOffsets(IRGenFunction &IGF, SILType T) const {
return StructNonFixedOffsets(T);
}
MemberAccessStrategy
getNonFixedFieldAccessStrategy(IRGenModule &IGM, SILType T,
const StructFieldInfo &field) const {
return StructNonFixedOffsets(T).getFieldAccessStrategy(IGM,
field.getNonFixedElementIndex());
}
llvm::Value *getEnumTagSinglePayload(IRGenFunction &IGF,
llvm::Value *numEmptyCases,
Address structAddr,
SILType structType,
bool isOutlined) const override {
// If we're not emitting the value witness table's implementation,
// just call that.
if (!isOutlined) {
return emitGetEnumTagSinglePayloadCall(IGF, structType, numEmptyCases,
structAddr);
}
return emitGetEnumTagSinglePayloadGenericCall(IGF, structType, *this,
numEmptyCases, structAddr,
[this,structType](IRGenFunction &IGF, Address structAddr,
llvm::Value *structNumXI) {
return withExtraInhabitantProvidingField(IGF, structAddr, structType,
structNumXI, IGF.IGM.Int32Ty,
[&](const FieldImpl &field, llvm::Value *numXI) -> llvm::Value* {
Address fieldAddr = asImpl().projectFieldAddress(
IGF, structAddr, structType, field);
auto fieldTy = field.getType(IGF.IGM, structType);
return field.getTypeInfo()
.getExtraInhabitantTagDynamic(IGF, fieldAddr, fieldTy,
numXI, /*outlined*/ false);
});
});
}
void storeEnumTagSinglePayload(IRGenFunction &IGF,
llvm::Value *whichCase,
llvm::Value *numEmptyCases,
Address structAddr,
SILType structType,
bool isOutlined) const override {
// If we're not emitting the value witness table's implementation,
// just call that.
if (!isOutlined) {
return emitStoreEnumTagSinglePayloadCall(IGF, structType, whichCase,
numEmptyCases, structAddr);
}
emitStoreEnumTagSinglePayloadGenericCall(IGF, structType, *this,
whichCase, numEmptyCases,
structAddr,
[this,structType](IRGenFunction &IGF, Address structAddr,
llvm::Value *tag, llvm::Value *structNumXI) {
withExtraInhabitantProvidingField(IGF, structAddr, structType,
structNumXI, IGF.IGM.VoidTy,
[&](const FieldImpl &field, llvm::Value *numXI) -> llvm::Value* {
Address fieldAddr = asImpl().projectFieldAddress(
IGF, structAddr, structType, field);
auto fieldTy = field.getType(IGF.IGM, structType);
field.getTypeInfo()
.storeExtraInhabitantTagDynamic(IGF, tag, fieldAddr, fieldTy,
/*outlined*/ false);
return nullptr;
});
});
}
};
class StructTypeBuilder :
public RecordTypeBuilder<StructTypeBuilder, StructFieldInfo, VarDecl*> {
llvm::StructType *StructTy;
CanType TheStruct;
public:
StructTypeBuilder(IRGenModule &IGM, llvm::StructType *structTy,
CanType type) :
RecordTypeBuilder(IGM), StructTy(structTy), TheStruct(type) {
}
LoadableStructTypeInfo *createLoadable(ArrayRef<StructFieldInfo> fields,
StructLayout &&layout,
unsigned explosionSize) {
return LoadableStructTypeInfo::create(fields,
explosionSize,
layout.getType(),
layout.getSize(),
std::move(layout.getSpareBits()),
layout.getAlignment(),
layout.isPOD(),
layout.isAlwaysFixedSize());
}
FixedStructTypeInfo *createFixed(ArrayRef<StructFieldInfo> fields,
StructLayout &&layout) {
return FixedStructTypeInfo::create(fields, layout.getType(),
layout.getSize(),
std::move(layout.getSpareBits()),
layout.getAlignment(),
layout.isPOD(),
layout.isBitwiseTakable(),
layout.isAlwaysFixedSize());
}
NonFixedStructTypeInfo *createNonFixed(ArrayRef<StructFieldInfo> fields,
FieldsAreABIAccessible_t fieldsAccessible,
StructLayout &&layout) {
auto structAccessible = IsABIAccessible_t(
IGM.getSILModule().isTypeMetadataAccessible(TheStruct));
return NonFixedStructTypeInfo::create(fields, fieldsAccessible,
layout.getType(),
layout.getAlignment(),
layout.isPOD(),
layout.isBitwiseTakable(),
structAccessible);
}
StructFieldInfo getFieldInfo(unsigned index,
VarDecl *field, const TypeInfo &fieldTI) {
return StructFieldInfo(field, fieldTI);
}
SILType getType(VarDecl *field) {
assert(field->getDeclContext() == TheStruct->getAnyNominal());
auto silType = SILType::getPrimitiveAddressType(TheStruct);
return silType.getFieldType(
field, IGM.getSILModule(),
IGM.getMaximalTypeExpansionContext());
}
StructLayout performLayout(ArrayRef<const TypeInfo *> fieldTypes) {
return StructLayout(IGM, TheStruct->getAnyNominal(),
LayoutKind::NonHeapObject,
LayoutStrategy::Optimal, fieldTypes, StructTy);