xpcom/windbgdlg/windbgdlg.cpp
author Mike Hommey <mh+mozilla@glandium.org>
Sat, 04 Oct 2014 10:33:00 +0900
changeset 208801 d959a6081ceacde13d41b8a4ee192c912c85ef02
parent 150399 ad59ee55f59606bb7d07bf0d442a9078041c20a1
child 274259 0104f1c911ca36aaf413df211ebc7320f61ed853
permissions -rw-r--r--
Bug 1077151 - Always use expandlibs descriptors when they exist. r=mshal Currently, when there is both an expandlibs descriptor and an actual static library, expandlibs picks the static library. This has the side effect that if there are object files in the static library that aren't directly used, they're dropped when linking, even when they export symbols that would be exported in the final linked binary. In most cases in the code base, files are not dropped that way. The most notable counter-example is xpcomglue, where actually not dropping files leads to link failure because of missing symbols those files reference (yes, that would tend to say the glue is broken in some way). On the opposite side, there is mozglue, which does have both a descriptor and a static library (the latter being necessary for the SDK), and that linking as a static library drops files that shouldn't be dropped (like jemalloc). We're currently relying on -Wl,--whole-archive for those files not to be dropped, but that won't really be possible without much hassle in a world where mozglue dependencies live in moz.build land. Switching expandlibs to use descriptors when they exist, even when there is a static library (so, the opposite of the current behavior) allows to drop -Wl,--whole-archive and prepare for a better future. However, as mentioned, xpcomglue does still require to be linked through the static library, so we need to make it a static library only. To achieve that, we make NO_EXPAND_LIBS now actually mean no expandlibs and use that to build the various different xpcomglues.

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * 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/. */

/* Windows only app to show a modal debug dialog - launched by nsDebug.cpp */
#include <windows.h>
#include <stdlib.h>
#ifdef _MSC_VER
#include <strsafe.h>
#endif
#ifdef __MINGW32__
/* MingW currently does not implement a wide version of the
   startup routines.  Workaround is to implement something like
   it ourselves.  See bug 472063 */
#include <stdio.h>
#include <shellapi.h>
int WINAPI wWinMain(HINSTANCE, HINSTANCE, LPWSTR, int);

#undef __argc
#undef __wargv

static int __argc;
static wchar_t** __wargv;

int WINAPI
WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
        LPSTR lpszCommandLine, int nCmdShow)
{
  LPWSTR commandLine = GetCommandLineW();

  /* parse for __argc and __wargv for compatibility, since mingw
   * doesn't claim to support it :(
   */
  __wargv = CommandLineToArgvW(commandLine, &__argc);
  if (!__wargv)
    return 127;

  /* need to strip off any leading whitespace plus the first argument
   * (the executable itself) to match what should be passed to wWinMain
   */
  while ((*commandLine <= L' ') && *commandLine) {
    ++commandLine;
  }
  if (*commandLine == L'"') {
    ++commandLine;
    while ((*commandLine != L'"') && *commandLine) {
      ++commandLine;
    }
    if (*commandLine) {
      ++commandLine;
    }
  } else {
    while (*commandLine > L' ') {
      ++commandLine;
    }
  }
  while ((*commandLine <= L' ') && *commandLine) {
    ++commandLine;
  }

  int result = wWinMain(hInstance, hPrevInstance, commandLine, nCmdShow);
  LocalFree(__wargv);
  return result;
}
#endif /* __MINGW32__ */


int WINAPI
wWinMain(HINSTANCE  hInstance, HINSTANCE  hPrevInstance,
         LPWSTR  lpszCmdLine, int  nCmdShow)
{
    /* support for auto answering based on words in the assertion.
     * the assertion message is sent as a series of arguements (words) to the commandline.
     * set a "word" to 0xffffffff to let the word not affect this code.
     * set a "word" to 0xfffffffe to show the dialog.
     * set a "word" to 0x5 to ignore (program should continue).
     * set a "word" to 0x4 to retry (should fall into debugger).
     * set a "word" to 0x3 to abort (die).
     */
    DWORD regType;
    DWORD regValue = -1;
    DWORD regLength = sizeof regValue;
    HKEY hkeyCU, hkeyLM;
    RegOpenKeyExW(HKEY_CURRENT_USER, L"Software\\mozilla.org\\windbgdlg", 0, KEY_READ, &hkeyCU);
    RegOpenKeyExW(HKEY_LOCAL_MACHINE, L"Software\\mozilla.org\\windbgdlg", 0, KEY_READ, &hkeyLM);
    int argc =0;
    for (int i = __argc - 1; regValue == (DWORD)-1 && i; --i) {
        bool ok = false;
        if (hkeyCU)
            ok = RegQueryValueExW(hkeyCU, __wargv[i], 0, &regType, (LPBYTE)&regValue, &regLength) == ERROR_SUCCESS;
        if (!ok && hkeyLM)
            ok = RegQueryValueExW(hkeyLM, __wargv[i], 0, &regType, (LPBYTE)&regValue, &regLength) == ERROR_SUCCESS;
        if (!ok)
            regValue = -1;
    }
    if (hkeyCU)
        RegCloseKey(hkeyCU);
    if (hkeyLM)
        RegCloseKey(hkeyLM);
    if (regValue != (DWORD)-1 && regValue != (DWORD)-2)
        return regValue;
    static const int size = 4096;
    static WCHAR msg[size];

#ifdef _MSC_VER
    StringCchPrintfW(msg,
#else
    snwprintf(msg,
#endif
              size,
              L"%s\n\nClick Abort to exit the Application.\n"
              L"Click Retry to Debug the Application.\n"
              L"Click Ignore to continue running the Application.",
              lpszCmdLine);
    msg[size - 1] = L'\0';
    return MessageBoxW(nullptr, msg, L"NSGlue_Assertion",
                       MB_ICONSTOP | MB_SYSTEMMODAL |
                       MB_ABORTRETRYIGNORE | MB_DEFBUTTON3);
}