mirror of
https://github.com/apple/swift.git
synced 2025-12-14 20:36:38 +01:00
27f49cd19d
swift_retain and objc_retain both handle nil already, so we can bypass the generic Optional value witnesses when instantiating Optional on a class type, which happens kind of a lot. Swift SVN r23613
116 lines
3.9 KiB
C++
116 lines
3.9 KiB
C++
//===--- Private.h - Private runtime declarations --------------*- C++ -*--===//
|
|
//
|
|
// This source file is part of the Swift.org open source project
|
|
//
|
|
// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
|
|
// Licensed under Apache License v2.0 with Runtime Library Exception
|
|
//
|
|
// See http://swift.org/LICENSE.txt for license information
|
|
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Private declarations of the Swift runtime.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef SWIFT_RUNTIME_PRIVATE_H
|
|
#define SWIFT_RUNTIME_PRIVATE_H
|
|
|
|
#include "swift/Runtime/Config.h"
|
|
#include "swift/Runtime/Metadata.h"
|
|
#include "llvm/Support/Compiler.h"
|
|
|
|
namespace swift {
|
|
struct ProtocolDescriptor;
|
|
|
|
#if SWIFT_HAS_ISA_MASKING
|
|
extern "C" uintptr_t swift_isaMask;
|
|
#endif
|
|
|
|
#if SWIFT_OBJC_INTEROP
|
|
extern "C" LLVM_LIBRARY_VISIBILITY
|
|
bool _swift_objectConformsToObjCProtocol(const void *theObject,
|
|
const ProtocolDescriptor *theProtocol);
|
|
|
|
extern "C" LLVM_LIBRARY_VISIBILITY
|
|
bool _swift_classConformsToObjCProtocol(const void *theClass,
|
|
const ProtocolDescriptor *theProtocol);
|
|
#endif
|
|
|
|
extern "C" LLVM_LIBRARY_VISIBILITY LLVM_ATTRIBUTE_NORETURN
|
|
void _swift_abortRetainUnowned(const void *object);
|
|
|
|
extern "C" LLVM_LIBRARY_VISIBILITY
|
|
void _swift_deallocClassInstance(HeapObject *object);
|
|
|
|
/// Is the given value a valid alignment mask?
|
|
static inline bool isAlignmentMask(size_t mask) {
|
|
// mask == xyz01111...
|
|
// mask+1 == xyz10000...
|
|
// mask&(mask+1) == xyz00000...
|
|
// So this is nonzero if and only if there any bits set
|
|
// other than an arbitrarily long sequence of low bits.
|
|
return (mask & (mask + 1)) == 0;
|
|
}
|
|
|
|
/// Return the class of an object which is known to be an allocated
|
|
/// heap object.
|
|
static inline const ClassMetadata *_swift_getClassOfAllocated(const void *object) {
|
|
// Load the isa field.
|
|
uintptr_t bits = *reinterpret_cast<const uintptr_t*>(object);
|
|
|
|
#if SWIFT_HAS_ISA_MASKING
|
|
// Apply the mask.
|
|
bits &= swift_isaMask;
|
|
#endif
|
|
|
|
// The result is a class pointer.
|
|
return reinterpret_cast<const ClassMetadata *>(bits);
|
|
}
|
|
|
|
/// Is the given value an Objective-C tagged pointer?
|
|
static inline bool isObjCTaggedPointer(const void *object) {
|
|
#if SWIFT_OBJC_INTEROP
|
|
return (((uintptr_t) object) & heap_object_abi::ObjCReservedBitsMask);
|
|
#else
|
|
assert(!(((uintptr_t) object) & heap_object_abi::ObjCReservedBitsMask));
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
static inline bool isObjCTaggedPointerOrNull(const void *object) {
|
|
return object == nullptr || isObjCTaggedPointer(object);
|
|
}
|
|
|
|
LLVM_LIBRARY_VISIBILITY
|
|
const ClassMetadata *_swift_getClass(const void *object);
|
|
|
|
static inline
|
|
const ClassMetadata *_swift_getSuperclass(const ClassMetadata *theClass) {
|
|
return theClass->SuperClass;
|
|
}
|
|
|
|
LLVM_LIBRARY_VISIBILITY
|
|
bool usesNativeSwiftReferenceCounting(const ClassMetadata *theClass);
|
|
|
|
/// Get the superclass pointer value used for Swift root classes.
|
|
/// Note that this function may return a nullptr on non-objc platforms,
|
|
/// where there is no common root class. rdar://problem/18987058
|
|
const ClassMetadata *getRootSuperclass();
|
|
|
|
/// Replace entries of a freshly-instantiated value witness table with more
|
|
/// efficient common implementations where applicable.
|
|
///
|
|
/// For instance, if the value witness table represents a POD type, this will
|
|
/// insert POD value witnesses into the table. The vwtable's flags must have
|
|
/// been initialized before calling this function.
|
|
///
|
|
/// Returns true if common value witnesses were used, false otherwise.
|
|
void installCommonValueWitnesses(ValueWitnessTable *vwtable);
|
|
|
|
|
|
} // end namespace swift
|
|
|
|
#endif /* SWIFT_RUNTIME_PRIVATE_H */
|