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// Copyright (c) 2015 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 <windows.h>
// The whole object of this file is to define |_load_config_used| which
// is a weakly-linked symbol that the linker knows about. The crt defines
// it as well it but this one will be used if present.
//
// The _load_config_used appears in the exe as a special member of the PE
// image format: the load config directory. This structure controls
// global parameters which are hard or impossible to set otherwise. This
// MSDN page https://goo.gl/zsGeVY documents some of the members.
//
// When making a changes to this stucture the only practical way to make
// sure they are honored is to run dumpbin.exe <exe-file> /loadconfig
// and inspect the results.
#if defined(_WIN64)
typedef struct {
DWORD Size;
DWORD TimeDateStamp;
WORD MajorVersion;
WORD MinorVersion;
DWORD GlobalFlagsClear;
DWORD GlobalFlagsSet;
DWORD CriticalSectionDefaultTimeout;
ULONGLONG DeCommitFreeBlockThreshold;
ULONGLONG DeCommitTotalFreeThreshold;
ULONGLONG LockPrefixTable;
ULONGLONG MaximumAllocationSize;
ULONGLONG VirtualMemoryThreshold;
ULONGLONG ProcessAffinityMask;
DWORD ProcessHeapFlags;
WORD CSDVersion;
WORD Reserved1;
ULONGLONG EditList;
ULONGLONG SecurityCookie;
ULONGLONG SEHandlerTable;
ULONGLONG SEHandlerCount;
} IMAGE_LOAD_CONFIG_DIRECTORY64_2;
typedef IMAGE_LOAD_CONFIG_DIRECTORY64_2 IMAGE_LOAD_CONFIG_DIRECTORY_2;
#else
typedef struct {
DWORD Size;
DWORD TimeDateStamp;
WORD MajorVersion;
WORD MinorVersion;
DWORD GlobalFlagsClear;
DWORD GlobalFlagsSet;
DWORD CriticalSectionDefaultTimeout;
DWORD DeCommitFreeBlockThreshold;
DWORD DeCommitTotalFreeThreshold;
DWORD LockPrefixTable;
DWORD MaximumAllocationSize;
DWORD VirtualMemoryThreshold;
DWORD ProcessHeapFlags;
DWORD ProcessAffinityMask;
WORD CSDVersion;
WORD Reserved1;
DWORD EditList;
PUINT_PTR SecurityCookie;
PVOID *SEHandlerTable;
DWORD SEHandlerCount;
} IMAGE_LOAD_CONFIG_DIRECTORY32_2;
typedef IMAGE_LOAD_CONFIG_DIRECTORY32_2 IMAGE_LOAD_CONFIG_DIRECTORY_2;
#endif
// What follows, except as indicated is verbatim (including casts) from
// <visual studio path>\VC\crt\src\intel\loadcfg.c. The default values
// are all 0 except for the last 3 members. See
// https://msdn.microsoft.com/en-us/library/9a89h429.aspx for an
// explanation of these members.
extern "C" UINT_PTR __security_cookie;
extern "C" PVOID __safe_se_handler_table[];
extern "C" BYTE __safe_se_handler_count;
// DeCommitTotalFreeThreshold: increase the decomit free threshold for
// the process heap, which is documented as "The size of the minimum
// total memory that must be freed in the process heap before it is
// freed (de-committed) in bytes".
//
// Set at 2 MiB what this does is prevent a lot of VirtualFree plus the
// following VirtualAlloc because the default value makes the heap too
// conservative on the ammount of memory it keeps for future allocations.
extern "C"
const IMAGE_LOAD_CONFIG_DIRECTORY_2 _load_config_used = {
sizeof(IMAGE_LOAD_CONFIG_DIRECTORY_2),
0, // TimeDateStamp.
0, // MajorVersion.
0, // MinorVersion.
0, // GlobalFlagsClear.
0, // GlobalFlagsSet.
0, // CriticalSectionDefaultTimeout.
0, // DeCommitFreeBlockThreshold.
2 * 1024 * 1024, // DeCommitTotalFreeThreshold.
0, // LockPrefixTable.
0, // MaximumAllocationSize.
0, // VirtualMemoryThreshold.
0, // ProcessHeapFlags.
0, // ProcessAffinityMask.
0, // CSDVersion.
0, // Reserved1.
0 , // EditList.
#ifdef _WIN64
(ULONGLONG)&__security_cookie,
#else
&__security_cookie,
__safe_se_handler_table,
(DWORD)(DWORD_PTR)&__safe_se_handler_count
#endif
};
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