mirror of
https://github.com/apple/swift.git
synced 2025-12-14 20:36:38 +01:00
c8bbce6ef1
* Mutations of slices of data should preserve relative indexing as well as cow semantics of slices * Ensure hashes of ranges are uniform to the expected hash for Data * Correct a few mistakes in the slice mutation tests * Update sequence initializations to avoid directly calling mutableCopy which prevents slice offset mismatches * Avoid invalid index slices in creating mirrors * Restore the original Data description * Resetting a slice region should expand the slice to the maximum of the region (not a out of bounds index of the backing buffer) * Remove stray comment and use a stack buffer for sequence appending * Return false when allocations fail in _resizeConditionalAllocationBuffer (not yet in use) * Enumeration of regions of a slice should be limited to the slice range in the case of custom backing (e.g. dispatch_data_t) * adjust assertion warnings for data indexes that are negative
73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
//===------------------------------------------------------------*- 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#import <Foundation/Foundation.h>
|
|
#import <objc/runtime.h>
|
|
#import <objc/message.h>
|
|
#import <sys/fcntl.h>
|
|
#import <alloca.h>
|
|
#import <stdlib.h>
|
|
#import <malloc/malloc.h>
|
|
|
|
#import "FoundationShimSupport.h"
|
|
#import "NSCalendarShims.h"
|
|
#import "NSCharacterSetShims.h"
|
|
#import "NSCoderShims.h"
|
|
#import "NSDataShims.h"
|
|
#import "NSDictionaryShims.h"
|
|
#import "NSErrorShims.h"
|
|
#import "NSFileManagerShims.h"
|
|
#import "NSIndexPathShims.h"
|
|
#import "NSIndexSetShims.h"
|
|
#import "NSKeyedArchiverShims.h"
|
|
#import "NSLocaleShims.h"
|
|
#import "NSTimeZoneShims.h"
|
|
#import "NSUndoManagerShims.h"
|
|
|
|
typedef struct {
|
|
void *_Nonnull memory;
|
|
size_t capacity;
|
|
_Bool onStack;
|
|
} _ConditionalAllocationBuffer;
|
|
|
|
static inline _Bool _resizeConditionalAllocationBuffer(_ConditionalAllocationBuffer *_Nonnull buffer, size_t amt) {
|
|
size_t amount = malloc_good_size(amt);
|
|
if (amount <= buffer->capacity) { return true; }
|
|
void *newMemory;
|
|
if (buffer->onStack) {
|
|
newMemory = malloc(amount);
|
|
if (newMemory == NULL) { return false; }
|
|
memcpy(newMemory, buffer->memory, buffer->capacity);
|
|
buffer->onStack = false;
|
|
} else {
|
|
newMemory = realloc(buffer->memory, amount);
|
|
if (newMemory == NULL) { return false; }
|
|
}
|
|
if (newMemory == NULL) { return false; }
|
|
buffer->memory = newMemory;
|
|
buffer->capacity = amount;
|
|
return true;
|
|
}
|
|
|
|
static inline _Bool _withStackOrHeapBuffer(size_t amount, void (__attribute__((noescape)) ^ _Nonnull applier)(_ConditionalAllocationBuffer *_Nonnull)) {
|
|
_ConditionalAllocationBuffer buffer;
|
|
buffer.capacity = malloc_good_size(amount);
|
|
buffer.onStack = (pthread_main_np() != 0 ? buffer.capacity < 2048 : buffer.capacity < 512);
|
|
buffer.memory = buffer.onStack ? alloca(buffer.capacity) : malloc(buffer.capacity);
|
|
if (buffer.memory == NULL) { return false; }
|
|
applier(&buffer);
|
|
if (!buffer.onStack) {
|
|
free(buffer.memory);
|
|
}
|
|
return true;
|
|
}
|