Rewrite of chrome_launcher.exe. ETW-based perf tests suggest that this is on average about 50% faster than the previous version.

Review URL: http://codereview.chromium.org/2278003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@48500 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 68 insertions, 0 deletions

diff --git a/chrome_frame/chrome_launcher_utils.cc b/chrome_frame/chrome_launcher_utils.cc
new file mode 100644
index 0000000..913ff14
--- /dev/null
+++ b/chrome_frame/chrome_launcher_utils.cc
@@ -0,0 +1,68 @@
+// Copyright (c) 2009 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_frame/chrome_launcher_utils.h"
+
+#include "base/base_switches.h"
+#include "base/command_line.h"
+#include "base/file_util.h"
+#include "base/logging.h"
+#include "base/path_service.h"
+#include "base/win_util.h"
+#include "chrome/common/chrome_constants.h"
+#include "chrome/common/chrome_switches.h"
+#include "chrome_frame/chrome_frame_automation.h"
+
+namespace chrome_launcher {
+
+const wchar_t kLauncherExeBaseName[] = L"chrome_launcher.exe";
+
+CommandLine* CreateLaunchCommandLine() {
+  // Shortcut for OS versions that don't need the integrity broker.
+  if (win_util::GetWinVersion() < win_util::WINVERSION_VISTA) {
+    return new CommandLine(GetChromeExecutablePath());
+  }
+
+  // The launcher EXE will be in the same directory as the Chrome Frame DLL,
+  // so create a full path to it based on this assumption.  Since our unit
+  // tests also use this function, and live in the directory above, we test
+  // existence of the file and try the path that includes the /servers/
+  // directory if needed.
+  FilePath module_path;
+  if (PathService::Get(base::FILE_MODULE, &module_path)) {
+    FilePath current_dir = module_path.DirName();
+    FilePath same_dir_path = current_dir.Append(kLauncherExeBaseName);
+    if (file_util::PathExists(same_dir_path)) {
+      return new CommandLine(same_dir_path);
+    } else {
+      FilePath servers_path =
+          current_dir.Append(L"servers").Append(kLauncherExeBaseName);
+      DCHECK(file_util::PathExists(servers_path)) <<
+          "What module is this? It's not in 'servers' or main output dir.";
+      return new CommandLine(servers_path);
+    }
+  } else {
+    NOTREACHED();
+    return NULL;
+  }
+}
+
+FilePath GetChromeExecutablePath() {
+  FilePath cur_path;
+  PathService::Get(base::DIR_MODULE, &cur_path);
+  cur_path = cur_path.Append(chrome::kBrowserProcessExecutableName);
+
+  // The installation model for Chrome places the DLLs in a versioned
+  // sub-folder one down from the Chrome executable. If we fail to find
+  // chrome.exe in the current path, try looking one up and launching that
+  // instead.
+  if (!file_util::PathExists(cur_path)) {
+    PathService::Get(base::DIR_MODULE, &cur_path);
+    cur_path = cur_path.DirName().Append(chrome::kBrowserProcessExecutableName);
+  }
+
+  return cur_path;
+}
+
+}  // namespace chrome_launcher