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//===--- LoadableTypeInfo.h - Supplement for loadable 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 LoadableTypeInfo, which supplements the TypeInfo
// interface for types that support being loaded and stored as
// Explosions.
//
//===----------------------------------------------------------------------===//
#ifndef SWIFT_IRGEN_LOADABLETYPEINFO_H
#define SWIFT_IRGEN_LOADABLETYPEINFO_H
#include "FixedTypeInfo.h"
namespace clang {
namespace CodeGen {
namespace swiftcall {
class SwiftAggLowering;
}
}
}
namespace swift {
namespace irgen {
class EnumPayload;
class IRBuilder;
using clang::CodeGen::swiftcall::SwiftAggLowering;
struct LoadedRef {
llvm::PointerIntPair<llvm::Value*, 1> ValAndNonNull;
ReferenceCounting style;
public:
LoadedRef(llvm::Value *V, bool nonNull, ReferenceCounting style): ValAndNonNull(V, nonNull), style(style) {}
LoadedRef(const LoadedRef &ref, bool nonNull): ValAndNonNull(ref.getValue(), nonNull), style(ref.getStyle()) {}
llvm::Value *getValue() const { return ValAndNonNull.getPointer(); }
bool isNonNull() const { return ValAndNonNull.getInt(); }
ReferenceCounting getStyle() const { return style; }
};
/// LoadableTypeInfo - A refinement of FixedTypeInfo designed for use
/// when implementing a type that can be loaded into an explosion.
/// Types that are not loadable are called address-only; this is the
/// same concept as exists in SIL.
///
/// The semantics of most of these operations are specified as if an
/// exploded value were a normal object that is merely not located in
/// memory.
class LoadableTypeInfo : public FixedTypeInfo {
protected:
LoadableTypeInfo(llvm::Type *type, Size size,
const SpareBitVector &spareBits,
Alignment align,
IsTriviallyDestroyable_t pod,
IsCopyable_t copy,
IsFixedSize_t alwaysFixedSize,
SpecialTypeInfoKind stik = SpecialTypeInfoKind::Loadable)
: FixedTypeInfo(type, size, spareBits, align, pod,
// All currently implemented loadable types are
// bitwise-takable and -borrowable.
IsBitwiseTakableAndBorrowable,
copy, alwaysFixedSize, stik) {
assert(isLoadable());
}
LoadableTypeInfo(llvm::Type *type, Size size,
SpareBitVector &&spareBits,
Alignment align,
IsTriviallyDestroyable_t pod,
IsCopyable_t copy,
IsFixedSize_t alwaysFixedSize,
SpecialTypeInfoKind stik = SpecialTypeInfoKind::Loadable)
: FixedTypeInfo(type, size, std::move(spareBits), align, pod,
// All currently implemented loadable types are
// bitwise-takable and borrowable.
IsBitwiseTakableAndBorrowable,
copy, alwaysFixedSize, stik) {
assert(isLoadable());
}
public:
// This is useful for metaprogramming.
static bool isLoadable() { return true; }
/// Return the number of elements in an explosion of this type.
virtual unsigned getExplosionSize() const = 0;
/// Load an explosion of values from an address as if copy-initializing
/// a set of registers.
virtual void loadAsCopy(IRGenFunction &IGF, Address addr,
Explosion &explosion) const = 0;
/// Load an explosion of values from an address as if
/// take-initializing a set of registers.
virtual void loadAsTake(IRGenFunction &IGF, Address addr,
Explosion &explosion) const = 0;
/// Assign a set of exploded values into an address. The values are
/// consumed out of the explosion.
virtual void assign(IRGenFunction &IGF, Explosion &explosion, Address addr,
bool isOutlined, SILType T) const = 0;
/// Initialize an address by consuming values out of an explosion.
virtual void initialize(IRGenFunction &IGF, Explosion &explosion,
Address addr, bool isOutlined) const = 0;
// We can give this a reasonable default implementation.
void initializeWithCopy(IRGenFunction &IGF, Address destAddr, Address srcAddr,
SILType T, bool isOutlined) const override;
/// Consume a bunch of values which have exploded at one explosion
/// level and produce them at another.
///
/// Essentially, this is like take-initializing the new explosion.
virtual void reexplode(Explosion &sourceExplosion,
Explosion &targetExplosion) const = 0;
/// Shift values from the source explosion to the target explosion
/// as if by copy-initialization.
virtual void copy(IRGenFunction &IGF, Explosion &sourceExplosion,
Explosion &targetExplosion, Atomicity atomicity) const = 0;
/// Release reference counts or other resources owned by the explosion.
virtual void consume(IRGenFunction &IGF, Explosion &explosion,
Atomicity atomicity,
SILType T) const = 0;
/// Fix the lifetime of the source explosion by creating opaque calls to
/// swift_fixLifetime for all reference types in the explosion.
virtual void fixLifetime(IRGenFunction &IGF, Explosion &explosion) const = 0;
/// Pack the source explosion into an enum payload.
virtual void packIntoEnumPayload(IRGenModule &IGM,
IRBuilder &builder,
EnumPayload &payload,
Explosion &sourceExplosion,
unsigned offset) const = 0;
/// Unpack an enum payload containing a valid value of the type into the
/// destination explosion.
virtual void unpackFromEnumPayload(IRGenFunction &IGF,
const EnumPayload &payload,
Explosion &targetExplosion,
unsigned offset) const = 0;
/// Load a reference counted pointer from an address.
/// Return the loaded pointer value.
virtual LoadedRef loadRefcountedPtr(IRGenFunction &IGF, SourceLoc loc,
Address addr) const;
/// Add this type to the given aggregate lowering.
virtual void addToAggLowering(IRGenModule &IGM, SwiftAggLowering &lowering,
Size offset) const = 0;
static void addScalarToAggLowering(IRGenModule &IGM,
SwiftAggLowering &lowering,
llvm::Type *type, Size offset,
Size storageSize);
static bool classof(const LoadableTypeInfo *type) { return true; }
static bool classof(const TypeInfo *type) { return type->isLoadable(); }
};
}
}
#endif
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