windows_os_utils.hpp

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//==-- windows_os_utils.hpp - Header file with common utils for Windows --==//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===--------------------------------------------------------------------===//
 
#pragma once
 
#include <shlwapi.h>
 
using OSModuleHandle = intptr_t;
constexpr OSModuleHandle ExeModuleHandle = -1;
inline OSModuleHandle getOSModuleHandle(const void *VirtAddr) {
  HMODULE PhModule;
  DWORD Flag = GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |
               GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT;
  auto LpModuleAddr = reinterpret_cast<LPCSTR>(VirtAddr);
  if (!GetModuleHandleExA(Flag, LpModuleAddr, &PhModule)) {
    // Expect the caller to check for zero and take
    // necessary action
    return 0;
  }
  if (PhModule == GetModuleHandleA(nullptr))
    return ExeModuleHandle;
  return reinterpret_cast<OSModuleHandle>(PhModule);
}