Stop delay loading user32.dll from chrome.dll on x86/Windows.

chrome/app/delay_load_hook_win.cc

+// Copyright (c) 2013 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 "chrome/app/delay_load_hook_win.h"
+
+#if defined(_WIN32_WINNT_WIN8) && _MSC_VER < 1700
+// The Windows 8 SDK defines FACILITY_VISUALCPP in winerror.h, and in
+// delayimp.h previous to VS2012.
+#undef FACILITY_VISUALCPP
+#endif
+#include <DelayIMP.h>
+
+#include "base/logging.h"
+#include "base/string_util.h"
+#include "base/stringprintf.h"
+
+// So long as these symbols are supplied to the final binary through an
+// object file (as opposed to indirectly through a library), these pointers
+// will override the CRT's symbols and direct the notifications to our hook.
+// Alternatively referencing the ChromeDelayLoadHook function somehow will
+// cause this declaration of these variables to take preference to the delay
+// load runtime's defaults (in delayimp.lib).
+PfnDliHook __pfnDliNotifyHook2 = ChromeDelayLoadHook;
+PfnDliHook __pfnDliFailureHook2 = ChromeDelayLoadHook;
+
+
+namespace {
+
+FARPROC OnPreLoadLibrary(DelayLoadInfo* info) {
+  // If the DLL name ends with "-delay.dll", this call is about one of our
+  // custom import libraries. In this case we need to snip the suffix off,
+  // and bind to the real DLL.
+  std::string dll_name(info->szDll);
+  const char kDelaySuffix[] = "-delay.dll";
+  if (EndsWith(dll_name, kDelaySuffix, false)) {
+    // Trim the "-delay.dll" suffix from the string.
+    dll_name.resize(dll_name.length() - (sizeof(kDelaySuffix) - 1));
+    dll_name.append(".dll");
+
+    return reinterpret_cast<FARPROC>(::LoadLibraryA(dll_name.c_str()));
+  }
+
+  return NULL;
+}
+
+}  // namespace
+
+// This function is a delay load notification hook. It is invoked by the
+// delay load support in the visual studio runtime.
+// See http://msdn.microsoft.com/en-us/library/z9h1h6ty(v=vs.100).aspx for
+// details.
+FARPROC WINAPI ChromeDelayLoadHook(unsigned reason, DelayLoadInfo* info) {
+  switch (reason) {
+    case dliNoteStartProcessing:
+    case dliNoteEndProcessing:
+      // Nothing to do here.
+      break;
+
+    case dliNotePreLoadLibrary:
+      return OnPreLoadLibrary(info);
+      break;
+
+    case dliNotePreGetProcAddress:
+      // Nothing to do here.
+      break;
+
+    case dliFailLoadLib:
+    case dliFailGetProc:
+      // Returning NULL from error notifications will cause the delay load
+      // runtime to raise a VcppException structured exception, that some code
+      // might want to handle.
+      return NULL;
+      break;
+
+    default:
+      NOTREACHED() << "Impossible delay load notification.";

[M-A Ruel, 2013/03/26 12:59:14]

It's tricky,  you could get into a loop here because NOTREACHED() could trigger
another delayed import.

[Sigurður Ásgeirsson, 2013/03/26 15:35:35]

That's true but unlikely now that we're not delay loading user32 (in particular)
any more - what do you suggest?
I'd consider it a bug if logging requires delay loading in any case :).

[M-A Ruel, 2013/03/26 15:44:37]

Indeed, I just guess there's no way to ensure that, and it'll likely regress
throughout the years. Maybe just add a comment about that.

+      break;
+  }
+
+  // Returning NULL causes the delay load machinery to perform default
+  // processing for this notification.
+  return NULL;
+}