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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_WindowsEnumProcessModules_h
#define mozilla_WindowsEnumProcessModules_h
#include <windows.h>
#include <psapi.h>
#include "mozilla/FunctionRef.h"
#include "mozilla/NativeNt.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/WinHeaderOnlyUtils.h"
namespace mozilla {
// Why don't we use CreateToolhelp32Snapshot instead of EnumProcessModules?
// CreateToolhelp32Snapshot gets the ANSI versions of module path strings
// via ntdll!RtlQueryProcessDebugInformation and stores them into a snapshot.
// Module32FirstW/Module32NextW re-converts ANSI into Unicode, but it cannot
// restore lost information. This means we still need GetModuleFileNameEx
// even when we use CreateToolhelp32Snapshot, but EnumProcessModules is faster.
inline bool EnumerateProcessModules(
const FunctionRef<void(const wchar_t*, HMODULE)>& aCallback) {
DWORD modulesSize;
if (!::EnumProcessModules(nt::kCurrentProcess, nullptr, 0, &modulesSize)) {
return false;
}
DWORD modulesNum = modulesSize / sizeof(HMODULE);
UniquePtr<HMODULE[]> modules = MakeUnique<HMODULE[]>(modulesNum);
if (!::EnumProcessModules(nt::kCurrentProcess, modules.get(),
modulesNum * sizeof(HMODULE), &modulesSize)) {
return false;
}
// The list may have shrunk between calls
if (modulesSize / sizeof(HMODULE) < modulesNum) {
modulesNum = modulesSize / sizeof(HMODULE);
}
for (DWORD i = 0; i < modulesNum; ++i) {
UniquePtr<wchar_t[]> modulePath = GetFullModulePath(modules[i]);
if (!modulePath) {
continue;
}
// Please note that modules[i] could be invalid if the module
// was unloaded after GetFullModulePath succeeded.
aCallback(modulePath.get(), modules[i]);
}
return true;
}
} // namespace mozilla
#endif // mozilla_WindowsEnumProcessModules_h
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