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88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
// Copyright 2018 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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#include "base/sampling_heap_profiler/module_cache.h"
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#include <objbase.h>
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#include <psapi.h>
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#include "base/process/process_handle.h"
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#include "base/stl_util.h"
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#include "base/strings/string_util.h"
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#include "base/strings/stringprintf.h"
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#include "base/strings/utf_string_conversions.h"
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#include "base/win/pe_image.h"
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#include "base/win/scoped_handle.h"
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namespace base {
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namespace {
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// Gets the unique build ID for a module. Windows build IDs are created by a
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// concatenation of a GUID and AGE fields found in the headers of a module. The
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// GUID is stored in the first 16 bytes and the AGE is stored in the last 4
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// bytes. Returns the empty string if the function fails to get the build ID.
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//
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// Example:
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// dumpbin chrome.exe /headers | find "Format:"
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// ... Format: RSDS, {16B2A428-1DED-442E-9A36-FCE8CBD29726}, 10, ...
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//
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// The resulting buildID string of this instance of chrome.exe is
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// "16B2A4281DED442E9A36FCE8CBD2972610".
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//
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// Note that the AGE field is encoded in decimal, not hex.
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std::string GetBuildIDForModule(HMODULE module_handle) {
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GUID guid;
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DWORD age;
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win::PEImage(module_handle).GetDebugId(&guid, &age, /* pdb_file= */ nullptr);
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const int kGUIDSize = 39;
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string16 build_id;
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int result =
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::StringFromGUID2(guid, WriteInto(&build_id, kGUIDSize), kGUIDSize);
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if (result != kGUIDSize)
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return std::string();
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RemoveChars(build_id, L"{}-", &build_id);
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build_id += StringPrintf(L"%d", age);
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return UTF16ToUTF8(build_id);
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}
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} // namespace
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// static
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ModuleCache::Module ModuleCache::CreateModuleForAddress(uintptr_t address) {
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HMODULE module_handle = nullptr;
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if (!::GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
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reinterpret_cast<LPCTSTR>(address),
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&module_handle)) {
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DCHECK_EQ(ERROR_MOD_NOT_FOUND, static_cast<int>(::GetLastError()));
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return Module();
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}
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Module module = CreateModuleForHandle(module_handle);
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::CloseHandle(module_handle);
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return module;
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}
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// static
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ModuleCache::Module ModuleCache::CreateModuleForHandle(HMODULE module_handle) {
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wchar_t module_name[MAX_PATH];
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DWORD result_length =
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::GetModuleFileName(module_handle, module_name, size(module_name));
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if (result_length == 0)
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return Module();
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const std::string& module_id = GetBuildIDForModule(module_handle);
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if (module_id.empty())
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return Module();
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MODULEINFO module_info;
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if (!::GetModuleInformation(GetCurrentProcessHandle(), module_handle,
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&module_info, sizeof(module_info))) {
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return Module();
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}
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return Module(reinterpret_cast<uintptr_t>(module_info.lpBaseOfDll), module_id,
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FilePath(module_name), module_info.SizeOfImage);
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}
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} // namespace base
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