mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-11-24 14:26:09 +03:00
95 lines
2.4 KiB
C++
95 lines
2.4 KiB
C++
// Copyright 2016 The Chromium Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
// This code should move into the default Windows shim once the win-specific
|
|
// allocation shim has been removed, and the generic shim has becaome the
|
|
// default.
|
|
|
|
#include "winheap_stubs_win.h"
|
|
|
|
#include <limits.h>
|
|
#include <malloc.h>
|
|
#include <new.h>
|
|
#include <windows.h>
|
|
|
|
namespace base {
|
|
namespace allocator {
|
|
|
|
bool g_is_win_shim_layer_initialized = false;
|
|
|
|
namespace {
|
|
|
|
const size_t kWindowsPageSize = 4096;
|
|
const size_t kMaxWindowsAllocation = INT_MAX - kWindowsPageSize;
|
|
|
|
inline HANDLE get_heap_handle() {
|
|
return reinterpret_cast<HANDLE>(_get_heap_handle());
|
|
}
|
|
|
|
} // namespace
|
|
|
|
void* WinHeapMalloc(size_t size) {
|
|
if (size < kMaxWindowsAllocation)
|
|
return HeapAlloc(get_heap_handle(), 0, size);
|
|
return nullptr;
|
|
}
|
|
|
|
void WinHeapFree(void* ptr) {
|
|
if (!ptr)
|
|
return;
|
|
|
|
HeapFree(get_heap_handle(), 0, ptr);
|
|
}
|
|
|
|
void* WinHeapRealloc(void* ptr, size_t size) {
|
|
if (!ptr)
|
|
return WinHeapMalloc(size);
|
|
if (!size) {
|
|
WinHeapFree(ptr);
|
|
return nullptr;
|
|
}
|
|
if (size < kMaxWindowsAllocation)
|
|
return HeapReAlloc(get_heap_handle(), 0, ptr, size);
|
|
return nullptr;
|
|
}
|
|
|
|
size_t WinHeapGetSizeEstimate(void* ptr) {
|
|
if (!ptr)
|
|
return 0;
|
|
|
|
// Get the user size of the allocation.
|
|
size_t size = HeapSize(get_heap_handle(), 0, ptr);
|
|
|
|
// Account for the 8-byte HEAP_HEADER preceding the block.
|
|
size += 8;
|
|
|
|
// Round up to the nearest allocation granularity, which is 8 for
|
|
// 32 bit machines, and 16 for 64 bit machines.
|
|
#if defined(ARCH_CPU_64_BITS)
|
|
const size_t kAllocationGranularity = 16;
|
|
#else
|
|
const size_t kAllocationGranularity = 8;
|
|
#endif
|
|
|
|
return (size + kAllocationGranularity - 1) & ~(kAllocationGranularity - 1);
|
|
}
|
|
|
|
// Call the new handler, if one has been set.
|
|
// Returns true on successfully calling the handler, false otherwise.
|
|
bool WinCallNewHandler(size_t size) {
|
|
#if !defined(_HAS_EXCEPTIONS) || _HAS_EXCEPTIONS
|
|
#error "Exceptions in allocator shim are not supported!"
|
|
#endif // defined(_HAS_EXCEPTIONS) && !_HAS_EXCEPTIONS
|
|
// Get the current new handler.
|
|
_PNH nh = _query_new_handler();
|
|
if (!nh)
|
|
return false;
|
|
// Since exceptions are disabled, we don't really know if new_handler
|
|
// failed. Assume it will abort if it fails.
|
|
return nh(size) ? true : false;
|
|
}
|
|
|
|
} // namespace allocator
|
|
} // namespace base
|