mirror of
https://github.com/apple/swift.git
synced 2025-12-14 20:36:38 +01:00
0983ea66ae
The assertions here are based around the idea that `std::atomic` is trivially constructible which is not a guarantee that the standard fully provides. The default initialization of the `std::atomic` type may leave it in an undetermined state. These were caught using the Visual C++ preview runtime. Ideally, the object constructor would use a placement new operator. However, prior to C++17, the C++ standard mandated that there be a NULL pointer check in the placement new operator. This is something which is no longer the case with C++17. Switch to the placement new operator for C++17 and newer and enable that codepath for Windows as well (which seemingly elides the null-pointer check with clang-cl).
109 lines
2.8 KiB
C++
109 lines
2.8 KiB
C++
//===--- GlobalObjects.h - Statically-initialized objects -------*- 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Objects that are allocated at global scope instead of on the heap,
|
|
// and statically initialized to avoid synchronization costs, are
|
|
// defined here.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
#ifndef SWIFT_STDLIB_SHIMS_GLOBALOBJECTS_H_
|
|
#define SWIFT_STDLIB_SHIMS_GLOBALOBJECTS_H_
|
|
|
|
#include "SwiftStdint.h"
|
|
#include "SwiftStdbool.h"
|
|
#include "HeapObject.h"
|
|
#include "Visibility.h"
|
|
|
|
#ifdef __cplusplus
|
|
namespace swift { extern "C" {
|
|
#endif
|
|
|
|
struct _SwiftArrayBodyStorage {
|
|
__swift_intptr_t count;
|
|
__swift_uintptr_t _capacityAndFlags;
|
|
};
|
|
|
|
struct _SwiftEmptyArrayStorage {
|
|
struct HeapObject header;
|
|
struct _SwiftArrayBodyStorage body;
|
|
};
|
|
|
|
SWIFT_RUNTIME_STDLIB_API
|
|
struct _SwiftEmptyArrayStorage _swiftEmptyArrayStorage;
|
|
|
|
struct _SwiftDictionaryBodyStorage {
|
|
__swift_intptr_t count;
|
|
__swift_intptr_t capacity;
|
|
__swift_int8_t scale;
|
|
__swift_int8_t reservedScale;
|
|
__swift_int16_t extra;
|
|
__swift_int32_t age;
|
|
__swift_intptr_t seed;
|
|
void *rawKeys;
|
|
void *rawValues;
|
|
};
|
|
|
|
struct _SwiftSetBodyStorage {
|
|
__swift_intptr_t count;
|
|
__swift_intptr_t capacity;
|
|
__swift_int8_t scale;
|
|
__swift_int8_t reservedScale;
|
|
__swift_int16_t extra;
|
|
__swift_int32_t age;
|
|
__swift_intptr_t seed;
|
|
void *rawElements;
|
|
};
|
|
|
|
struct _SwiftEmptyDictionarySingleton {
|
|
struct HeapObject header;
|
|
struct _SwiftDictionaryBodyStorage body;
|
|
__swift_uintptr_t metadata;
|
|
};
|
|
|
|
struct _SwiftEmptySetSingleton {
|
|
struct HeapObject header;
|
|
struct _SwiftSetBodyStorage body;
|
|
__swift_uintptr_t metadata;
|
|
};
|
|
|
|
SWIFT_RUNTIME_STDLIB_API
|
|
struct _SwiftEmptyDictionarySingleton _swiftEmptyDictionarySingleton;
|
|
|
|
SWIFT_RUNTIME_STDLIB_API
|
|
struct _SwiftEmptySetSingleton _swiftEmptySetSingleton;
|
|
|
|
struct _SwiftHashingParameters {
|
|
__swift_uint64_t seed0;
|
|
__swift_uint64_t seed1;
|
|
__swift_bool deterministic;
|
|
};
|
|
|
|
SWIFT_RUNTIME_STDLIB_API
|
|
struct _SwiftHashingParameters _swift_stdlib_Hashing_parameters;
|
|
|
|
#ifdef __cplusplus
|
|
|
|
static_assert(
|
|
sizeof(_SwiftDictionaryBodyStorage) ==
|
|
5 * sizeof(__swift_intptr_t) + sizeof(__swift_int64_t),
|
|
"_SwiftDictionaryBodyStorage has unexpected size");
|
|
|
|
static_assert(
|
|
sizeof(_SwiftSetBodyStorage) ==
|
|
4 * sizeof(__swift_intptr_t) + sizeof(__swift_int64_t),
|
|
"_SwiftSetBodyStorage has unexpected size");
|
|
|
|
}} // extern "C", namespace swift
|
|
#endif
|
|
|
|
#endif
|