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95 lines
2.3 KiB
C++
95 lines
2.3 KiB
C++
// Copyright 2016 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 code should move into the default Windows shim once the win-specific
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// allocation shim has been removed, and the generic shim has becaome the
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// default.
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#include "winheap_stubs_win.h"
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#include <limits.h>
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#include <malloc.h>
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#include <new.h>
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#include <windows.h>
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namespace base {
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namespace allocator {
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bool g_is_win_shim_layer_initialized = false;
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namespace {
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const size_t kWindowsPageSize = 4096;
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const size_t kMaxWindowsAllocation = INT_MAX - kWindowsPageSize;
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inline HANDLE get_heap_handle() {
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return reinterpret_cast<HANDLE>(_get_heap_handle());
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}
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} // namespace
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void* WinHeapMalloc(size_t size) {
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if (size < kMaxWindowsAllocation)
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return HeapAlloc(get_heap_handle(), 0, size);
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return nullptr;
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}
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void WinHeapFree(void* ptr) {
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if (!ptr)
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return;
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HeapFree(get_heap_handle(), 0, ptr);
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}
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void* WinHeapRealloc(void* ptr, size_t size) {
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if (!ptr)
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return WinHeapMalloc(size);
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if (!size) {
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WinHeapFree(ptr);
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return nullptr;
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}
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if (size < kMaxWindowsAllocation)
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return HeapReAlloc(get_heap_handle(), 0, ptr, size);
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return nullptr;
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}
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size_t WinHeapGetSizeEstimate(void* ptr) {
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if (!ptr)
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return 0;
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// Get the user size of the allocation.
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size_t size = HeapSize(get_heap_handle(), 0, ptr);
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// Account for the 8-byte HEAP_HEADER preceding the block.
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size += 8;
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// Round up to the nearest allocation granularity, which is 8 for
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// 32 bit machines, and 16 for 64 bit machines.
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#if defined(ARCH_CPU_64_BITS)
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const size_t kAllocationGranularity = 16;
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#else
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const size_t kAllocationGranularity = 8;
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#endif
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return (size + kAllocationGranularity - 1) & ~(kAllocationGranularity - 1);
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}
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// Call the new handler, if one has been set.
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// Returns true on successfully calling the handler, false otherwise.
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bool WinCallNewHandler(size_t size) {
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#ifdef _CPPUNWIND
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#error "Exceptions in allocator shim are not supported!"
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#endif // _CPPUNWIND
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// Get the current new handler.
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_PNH nh = _query_new_handler();
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if (!nh)
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return false;
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// Since exceptions are disabled, we don't really know if new_handler
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// failed. Assume it will abort if it fails.
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return nh(size) ? true : false;
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}
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} // namespace allocator
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} // namespace base
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