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//===--- ClassTypeInfo.h - The layout info for class types. -----*- C++ -*-===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2020 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 contains layout information for class types.
//
//===----------------------------------------------------------------------===//
#ifndef SWIFT_IRGEN_CLASSTYPEINFO_H
#define SWIFT_IRGEN_CLASSTYPEINFO_H
#include "ClassLayout.h"
#include "HeapTypeInfo.h"
#include "swift/ClangImporter/ClangImporterRequests.h"
namespace swift {
namespace irgen {
/// Layout information for class types.
class ClassTypeInfo : public HeapTypeInfo<ClassTypeInfo> {
ClassDecl *TheClass;
mutable llvm::StructType *classLayoutType;
// The resilient layout of the class, without making any assumptions
// that violate resilience boundaries. This is used to allocate
// and deallocate instances of the class, and to access fields.
mutable std::optional<ClassLayout> ResilientLayout;
// A completely fragile layout, used for metadata emission.
mutable std::optional<ClassLayout> FragileLayout;
/// Can we use swift reference-counting, or do we have to use
/// objc_retain/release?
const ReferenceCounting Refcount;
ClassLayout generateLayout(IRGenModule &IGM, SILType classType,
bool forBackwardDeployment) const;
public:
ClassTypeInfo(llvm::PointerType *irType, Size size, SpareBitVector spareBits,
Alignment align, ClassDecl *theClass,
ReferenceCounting refcount, llvm::StructType *classLayoutType)
: HeapTypeInfo(refcount, irType, size, std::move(spareBits), align),
TheClass(theClass), classLayoutType(classLayoutType),
Refcount(refcount) {}
ReferenceCounting getReferenceCounting() const { return Refcount; }
ClassDecl *getClass() const { return TheClass; }
llvm::Type *getClassLayoutType() const { return classLayoutType; }
const ClassLayout &getClassLayout(IRGenModule &IGM, SILType type,
bool forBackwardDeployment) const;
StructLayout *createLayoutWithTailElems(IRGenModule &IGM, SILType classType,
ArrayRef<SILType> tailTypes) const;
void emitScalarRelease(IRGenFunction &IGF, llvm::Value *value,
Atomicity atomicity) const override {
if (getReferenceCounting() == ReferenceCounting::Custom) {
auto releaseFn =
evaluateOrDefault(
getClass()->getASTContext().evaluator,
CustomRefCountingOperation(
{getClass(), CustomRefCountingOperationKind::release}),
{})
.operation;
IGF.emitForeignReferenceTypeLifetimeOperation(releaseFn, value);
return;
}
HeapTypeInfo::emitScalarRelease(IGF, value, atomicity);
}
void emitScalarRetain(IRGenFunction &IGF, llvm::Value *value,
Atomicity atomicity) const override {
if (getReferenceCounting() == ReferenceCounting::Custom) {
auto retainFn =
evaluateOrDefault(
getClass()->getASTContext().evaluator,
CustomRefCountingOperation(
{getClass(), CustomRefCountingOperationKind::retain}),
{})
.operation;
IGF.emitForeignReferenceTypeLifetimeOperation(retainFn, value);
return;
}
HeapTypeInfo::emitScalarRetain(IGF, value, atomicity);
}
void strongCustomRetain(IRGenFunction &IGF, Explosion &e,
bool needsNullCheck) const {
assert(getReferenceCounting() == ReferenceCounting::Custom &&
"only supported for custom ref-counting");
llvm::Value *value = e.claimNext();
auto retainFn =
evaluateOrDefault(
getClass()->getASTContext().evaluator,
CustomRefCountingOperation(
{getClass(), CustomRefCountingOperationKind::retain}),
{})
.operation;
IGF.emitForeignReferenceTypeLifetimeOperation(retainFn, value,
needsNullCheck);
}
// Implement the primary retain/release operations of ReferenceTypeInfo
// using basic reference counting.
void strongRetain(IRGenFunction &IGF, Explosion &e,
Atomicity atomicity) const override {
if (getReferenceCounting() == ReferenceCounting::Custom) {
strongCustomRetain(IGF, e, /*needsNullCheck*/ false);
return;
}
HeapTypeInfo::strongRetain(IGF, e, atomicity);
}
void strongCustomRelease(IRGenFunction &IGF, Explosion &e,
bool needsNullCheck) const {
assert(getReferenceCounting() == ReferenceCounting::Custom &&
"only supported for custom ref-counting");
llvm::Value *value = e.claimNext();
auto releaseFn =
evaluateOrDefault(
getClass()->getASTContext().evaluator,
CustomRefCountingOperation(
{getClass(), CustomRefCountingOperationKind::release}),
{})
.operation;
IGF.emitForeignReferenceTypeLifetimeOperation(releaseFn, value,
needsNullCheck);
}
void strongRelease(IRGenFunction &IGF, Explosion &e,
Atomicity atomicity) const override {
if (getReferenceCounting() == ReferenceCounting::Custom) {
strongCustomRelease(IGF, e, /*needsNullCheck*/ false);
return;
}
HeapTypeInfo::strongRelease(IGF, e, atomicity);
}
};
} // namespace irgen
} // namespace swift
#endif
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