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//===--- NonFixedTypeInfo.h - Non-fixed-layout types ------------*- C++ -*-===//
//
// 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 defines classes that are useful for implementing types
// that do not have a fixed representation and cannot be laid out
// statically.
//
// These classes are useful only for creating TypeInfo
// implementations; unlike the similarly-named FixedTypeInfo, they
// do not provide a supplemental API.
//
//===----------------------------------------------------------------------===//
#ifndef SWIFT_IRGEN_NONFIXEDTYPEINFO_H
#define SWIFT_IRGEN_NONFIXEDTYPEINFO_H
#include "Address.h"
#include "GenOpaque.h"
#include "IndirectTypeInfo.h"
#include "Outlining.h"
namespace swift {
namespace irgen {
/// An abstract CRTP class designed for types whose storage size,
/// alignment, and stride need to be fetched from the value witness
/// table for the type.
template <class Impl>
class WitnessSizedTypeInfo : public IndirectTypeInfo<Impl, TypeInfo> {
private:
using super = IndirectTypeInfo<Impl, TypeInfo>;
protected:
const Impl &asImpl() const { return static_cast<const Impl &>(*this); }
WitnessSizedTypeInfo(llvm::Type *type, Alignment align, IsTriviallyDestroyable_t pod,
IsBitwiseTakable_t bt,
IsCopyable_t cp,
IsABIAccessible_t abi)
: super(type, align, pod, bt, cp,
IsNotFixedSize, abi,
SpecialTypeInfoKind::None) {}
private:
/// Bit-cast the given pointer to the right type and assume it as an
/// address of this type.
Address getAsBitCastAddress(IRGenFunction &IGF, llvm::Value *addr) const {
addr = IGF.Builder.CreateBitCast(addr,
this->getStorageType()->getPointerTo());
return this->getAddressForPointer(addr);
}
public:
// This is useful for metaprogramming.
static bool isFixed() { return false; }
StackAddress allocateStack(IRGenFunction &IGF, SILType T,
const llvm::Twine &name) const override {
// Allocate memory on the stack.
auto alloca = IGF.emitDynamicAlloca(T, name);
IGF.Builder.CreateLifetimeStart(alloca.getAddressPointer());
return alloca.withAddress(
getAsBitCastAddress(IGF, alloca.getAddressPointer()));
}
StackAddress allocateVector(IRGenFunction &IGF, SILType T,
llvm::Value *capacity,
const Twine &name) const override {
llvm_unreachable("not implemented, yet");
}
void deallocateStack(IRGenFunction &IGF, StackAddress stackAddress,
SILType T) const override {
IGF.Builder.CreateLifetimeEnd(stackAddress.getAddress().getAddress());
IGF.emitDeallocateDynamicAlloca(stackAddress);
}
void destroyStack(IRGenFunction &IGF, StackAddress stackAddress, SILType T,
bool isOutlined) const override {
emitDestroyCall(IGF, T, stackAddress.getAddress());
deallocateStack(IGF, stackAddress, T);
}
llvm::Value *getValueWitnessTable(IRGenFunction &IGF, SILType T) const {
return IGF.emitValueWitnessTableRef(T);
}
llvm::Value *getSize(IRGenFunction &IGF, SILType T) const override {
return emitLoadOfSize(IGF, T);
}
llvm::Value *getAlignmentMask(IRGenFunction &IGF, SILType T) const override {
return emitLoadOfAlignmentMask(IGF, T);
}
llvm::Value *getStride(IRGenFunction &IGF, SILType T) const override {
return emitLoadOfStride(IGF, T);
}
llvm::Value *getIsTriviallyDestroyable(IRGenFunction &IGF, SILType T) const override {
return emitLoadOfIsTriviallyDestroyable(IGF, T);
}
llvm::Value *getIsBitwiseTakable(IRGenFunction &IGF, SILType T) const override {
return emitLoadOfIsBitwiseTakable(IGF, T);
}
llvm::Value *isDynamicallyPackedInline(IRGenFunction &IGF,
SILType T) const override {
return emitLoadOfIsInline(IGF, T);
}
bool mayHaveExtraInhabitants(IRGenModule &) const override { return true; }
llvm::Constant *getStaticSize(IRGenModule &IGM) const override {
return nullptr;
}
llvm::Constant *getStaticAlignmentMask(IRGenModule &IGM) const override {
return nullptr;
}
llvm::Constant *getStaticStride(IRGenModule &IGM) const override {
return nullptr;
}
};
class BitwiseCopyableTypeInfo
: public WitnessSizedTypeInfo<BitwiseCopyableTypeInfo> {
using Self = BitwiseCopyableTypeInfo;
using Super = WitnessSizedTypeInfo<Self>;
BitwiseCopyableTypeInfo(llvm::Type *type, IsABIAccessible_t abiAccessible)
: Super(type, Alignment(1), IsNotTriviallyDestroyable,
IsNotBitwiseTakable, IsCopyable, abiAccessible) {}
public:
static BitwiseCopyableTypeInfo *create(llvm::Type *type,
IsABIAccessible_t abiAccessible) {
return new Self(type, abiAccessible);
}
void bitwiseCopy(IRGenFunction &IGF, Address destAddr, Address srcAddr,
SILType T, bool isOutlined) const {
IGF.Builder.CreateMemCpy(destAddr, srcAddr, getSize(IGF, T));
}
void initializeWithTake(IRGenFunction &IGF, Address destAddr, Address srcAddr,
SILType T, bool isOutlined) const override {
bitwiseCopy(IGF, destAddr, srcAddr, T, isOutlined);
}
void initializeWithCopy(IRGenFunction &IGF, Address destAddr, Address srcAddr,
SILType T, bool isOutlined) const override {
bitwiseCopy(IGF, destAddr, srcAddr, T, isOutlined);
}
void assignWithCopy(IRGenFunction &IGF, Address destAddr, Address srcAddr,
SILType T, bool isOutlined) const override {
bitwiseCopy(IGF, destAddr, srcAddr, T, isOutlined);
}
void assignWithTake(IRGenFunction &IGF, Address destAddr, Address srcAddr,
SILType T, bool isOutlined) const override {
bitwiseCopy(IGF, destAddr, srcAddr, T, isOutlined);
}
void destroy(IRGenFunction &IGF, Address address, SILType T,
bool isOutlined) const override {
// BitwiseCopyable types are trivial, so destroy is a no-op.
}
llvm::Value *getEnumTagSinglePayload(IRGenFunction &IGF,
llvm::Value *numEmptyCases,
Address enumAddr, SILType T,
bool isOutlined) const override {
return emitGetEnumTagSinglePayloadCall(IGF, T, numEmptyCases, enumAddr);
}
void storeEnumTagSinglePayload(IRGenFunction &IGF, llvm::Value *whichCase,
llvm::Value *numEmptyCases, Address enumAddr,
SILType T, bool isOutlined) const override {
emitStoreEnumTagSinglePayloadCall(IGF, T, whichCase, numEmptyCases,
enumAddr);
}
void collectMetadataForOutlining(OutliningMetadataCollector &collector,
SILType T) const override {
// We'll need formal type metadata for this archetype.
collector.collectTypeMetadata(T);
}
TypeLayoutEntry *buildTypeLayoutEntry(IRGenModule &IGM, SILType T,
bool useStructLayouts) const override {
return IGM.typeLayoutCache.getOrCreateArchetypeEntry(T.getObjectType());
}
};
}
}
#endif
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