1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
|
// Copyright (c) 2013 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.
#include "base/process/memory.h"
#include <new.h>
#include <psapi.h>
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
namespace base {
namespace {
#pragma warning(push)
#pragma warning(disable: 4702)
int OnNoMemory(size_t) {
// Kill the process. This is important for security since most of code
// does not check the result of memory allocation.
__debugbreak();
_exit(1);
return 0;
}
#pragma warning(pop)
// HeapSetInformation function pointer.
typedef BOOL (WINAPI* HeapSetFn)(HANDLE, HEAP_INFORMATION_CLASS, PVOID, SIZE_T);
} // namespace
bool EnableLowFragmentationHeap() {
HMODULE kernel32 = GetModuleHandle(L"kernel32.dll");
HeapSetFn heap_set = reinterpret_cast<HeapSetFn>(GetProcAddress(
kernel32,
"HeapSetInformation"));
// On Windows 2000, the function is not exported. This is not a reason to
// fail.
if (!heap_set)
return true;
unsigned number_heaps = GetProcessHeaps(0, NULL);
if (!number_heaps)
return false;
// Gives us some extra space in the array in case a thread is creating heaps
// at the same time we're querying them.
static const int MARGIN = 8;
scoped_ptr<HANDLE[]> heaps(new HANDLE[number_heaps + MARGIN]);
number_heaps = GetProcessHeaps(number_heaps + MARGIN, heaps.get());
if (!number_heaps)
return false;
for (unsigned i = 0; i < number_heaps; ++i) {
ULONG lfh_flag = 2;
// Don't bother with the result code. It may fails on heaps that have the
// HEAP_NO_SERIALIZE flag. This is expected and not a problem at all.
heap_set(heaps[i],
HeapCompatibilityInformation,
&lfh_flag,
sizeof(lfh_flag));
}
return true;
}
void EnableTerminationOnHeapCorruption() {
// Ignore the result code. Supported on XP SP3 and Vista.
HeapSetInformation(NULL, HeapEnableTerminationOnCorruption, NULL, 0);
}
void EnableTerminationOnOutOfMemory() {
_set_new_handler(&OnNoMemory);
_set_new_mode(1);
}
HMODULE GetModuleFromAddress(void* address) {
HMODULE instance = NULL;
if (!::GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |
GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
static_cast<char*>(address),
&instance)) {
NOTREACHED();
}
return instance;
}
// TODO(b.kelemen): implement it with the required semantics. On Linux this is
// implemented with a weak symbol that is overridden by tcmalloc. This is
// neccessary because base cannot have a direct dependency on tcmalloc. Since
// weak symbols are not supported on Windows this will involve some build time
// magic, much like what is done for libcrt in order to override the allocation
// functions.
bool UncheckedMalloc(size_t size, void** result) {
*result = malloc(size);
return *result != NULL;
}
} // namespace base
|
