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//===--- GenHeap.h - Heap-object layout and management ----------*- 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 some routines that are useful for emitting
// operations on heap objects and their metadata.
//
//===----------------------------------------------------------------------===//
#ifndef SWIFT_IRGEN_GENHEAP_H
#define SWIFT_IRGEN_GENHEAP_H
#include "NecessaryBindings.h"
#include "StructLayout.h"
namespace llvm {
class Constant;
template <class T> class SmallVectorImpl;
}
namespace swift {
namespace irgen {
class Address;
class OwnedAddress;
enum class IsaEncoding : unsigned char;
/// A heap layout is the result of laying out a complete structure for
/// heap-allocation.
class HeapLayout : public StructLayout {
SmallVector<SILType, 8> ElementTypes;
NecessaryBindings Bindings;
unsigned BindingsIndex;
mutable llvm::Constant *privateMetadata = nullptr;
public:
HeapLayout(IRGenModule &IGM, LayoutStrategy strategy,
ArrayRef<SILType> elementTypes,
ArrayRef<const TypeInfo *> elementTypeInfos,
llvm::StructType *typeToFill = 0,
NecessaryBindings &&bindings = {}, unsigned bindingsIndex = 0);
/// True if the heap object carries type bindings.
///
/// If true, the first element of the heap layout will be the type metadata
/// buffer.
bool hasBindings() const {
return !Bindings.empty();
}
const NecessaryBindings &getBindings() const {
return Bindings;
}
unsigned getBindingsIndex() const { return BindingsIndex; }
unsigned getIndexAfterBindings() const {
return BindingsIndex + (hasBindings() ? 1 : 0);
}
/// Get the types of the elements.
ArrayRef<SILType> getElementTypes() const {
return ElementTypes;
}
/// Build a size function for this layout.
llvm::Constant *createSizeFn(IRGenModule &IGM) const;
/// As a convenience, build a metadata object with internal linkage
/// consisting solely of the standard heap metadata.
llvm::Constant *getPrivateMetadata(IRGenModule &IGM,
llvm::Constant *captureDescriptor) const;
};
class HeapNonFixedOffsets : public NonFixedOffsetsImpl {
SmallVector<llvm::Value *, 1> Offsets;
llvm::Value *TotalSize;
llvm::Value *TotalAlignMask;
public:
HeapNonFixedOffsets(IRGenFunction &IGF, const HeapLayout &layout);
llvm::Value *getOffsetForIndex(IRGenFunction &IGF, unsigned index) override {
auto result = Offsets[index];
assert(result != nullptr
&& "fixed-layout field doesn't need NonFixedOffsets");
return result;
}
// The total size of the heap object.
llvm::Value *getSize() const {
return TotalSize;
}
// The total alignment of the heap object.
llvm::Value *getAlignMask() const {
return TotalAlignMask;
}
};
/// Emit a heap object deallocation.
void emitDeallocateHeapObject(IRGenFunction &IGF,
llvm::Value *object,
llvm::Value *size,
llvm::Value *alignMask);
/// Emit a class instance deallocation.
void emitDeallocateClassInstance(IRGenFunction &IGF,
llvm::Value *object,
llvm::Value *size,
llvm::Value *alignMask);
/// Emit a partial class instance deallocation from a failing constructor.
void emitDeallocatePartialClassInstance(IRGenFunction &IGF,
llvm::Value *object,
llvm::Value *metadata,
llvm::Value *size,
llvm::Value *alignMask);
/// Allocate a boxed value.
///
/// The interface type is required for emitting reflection metadata.
OwnedAddress
emitAllocateBox(IRGenFunction &IGF,
CanSILBoxType boxType,
GenericEnvironment *env,
const llvm::Twine &name);
/// Deallocate a box whose value is uninitialized.
void emitDeallocateBox(IRGenFunction &IGF, llvm::Value *box,
CanSILBoxType boxType);
/// Project the address of the value inside a box.
Address emitProjectBox(IRGenFunction &IGF, llvm::Value *box,
CanSILBoxType boxType);
/// Allocate a boxed value based on the boxed type. Returns the address of the
/// storage for the value.
Address
emitAllocateExistentialBoxInBuffer(IRGenFunction &IGF, SILType boxedType,
Address destBuffer, GenericEnvironment *env,
const llvm::Twine &name, bool isOutlined);
/// Given a heap-object instance, with some heap-object type,
/// produce a reference to its type metadata.
llvm::Value *emitDynamicTypeOfHeapObject(IRGenFunction &IGF,
llvm::Value *object,
MetatypeRepresentation rep,
SILType objectType,
bool allowArtificialSubclasses = false);
/// Given a non-tagged object pointer, load a pointer to its class object.
llvm::Value *emitLoadOfObjCHeapMetadataRef(IRGenFunction &IGF,
llvm::Value *object);
/// Given a heap-object instance, with some heap-object type, produce a
/// reference to its heap metadata by dynamically asking the runtime for it.
llvm::Value *emitHeapMetadataRefForUnknownHeapObject(IRGenFunction &IGF,
llvm::Value *object);
/// Given a heap-object instance, with some heap-object type,
/// produce a reference to its heap metadata.
llvm::Value *emitHeapMetadataRefForHeapObject(IRGenFunction &IGF,
llvm::Value *object,
CanType objectType,
bool suppressCast = false);
/// Given a heap-object instance, with some heap-object type,
/// produce a reference to its heap metadata.
llvm::Value *emitHeapMetadataRefForHeapObject(IRGenFunction &IGF,
llvm::Value *object,
SILType objectType,
bool suppressCast = false);
/// What isa-encoding mechanism does a type use?
IsaEncoding getIsaEncodingForType(IRGenModule &IGM, CanType type);
} // end namespace irgen
} // end namespace swift
#endif