74 lines
1.9 KiB
C++
74 lines
1.9 KiB
C++
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// This is a simple allocator based on the windows heap.
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extern "C" {
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HANDLE win_heap;
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bool win_heap_init(bool use_lfh) {
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win_heap = HeapCreate(0, 0, 0);
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if (win_heap == NULL)
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return false;
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if (use_lfh) {
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ULONG enable_lfh = 2;
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HeapSetInformation(win_heap, HeapCompatibilityInformation,
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&enable_lfh, sizeof(enable_lfh));
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// NOTE: Setting LFH may fail. Vista already has it enabled.
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// And under the debugger, it won't use LFH. So we
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// ignore any errors.
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}
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return true;
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}
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void* win_heap_malloc(size_t size) {
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return HeapAlloc(win_heap, 0, size);
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}
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void win_heap_free(void* size) {
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HeapFree(win_heap, 0, size);
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}
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void* win_heap_realloc(void* ptr, size_t size) {
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if (!ptr)
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return win_heap_malloc(size);
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if (!size) {
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win_heap_free(ptr);
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return NULL;
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}
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return HeapReAlloc(win_heap, 0, ptr, size);
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}
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size_t win_heap_msize(void* ptr) {
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return HeapSize(win_heap, 0, ptr);
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}
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void* win_heap_memalign(size_t alignment, size_t size) {
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// Reserve enough space to ensure we can align and set aligned_ptr[-1] to the
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// original allocation for use with win_heap_memalign_free() later.
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size_t allocation_size = size + (alignment - 1) + sizeof(void*);
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// Check for overflow. Alignment and size are checked in allocator_shim.
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DCHECK_LT(size, allocation_size);
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DCHECK_LT(alignment, allocation_size);
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void* ptr = win_heap_malloc(allocation_size);
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char* aligned_ptr = static_cast<char*>(ptr) + sizeof(void*);
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aligned_ptr +=
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alignment - reinterpret_cast<uintptr_t>(aligned_ptr) & (alignment - 1);
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reinterpret_cast<void**>(aligned_ptr)[-1] = ptr;
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return aligned_ptr;
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}
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void win_heap_memalign_free(void* ptr) {
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if (ptr)
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win_heap_free(static_cast<void**>(ptr)[-1]);
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}
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} // extern "C"
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