My Octopress Blog

life and I

Chrome启动流程

| Comments

主函数

在src/chrome/app/中，对应于不同平台存在不同的主函数入口文件，比如

  • chrome_exe_main_gtk.cc
  • chrmoe_exe_main_win.cc
  • chrome_exe_main_mac.cc

以chrome_exe_main_gtk.cc为例

chrome_exe_main_gtk.cc
1
2
3
4
5
6
7
8
9
10
11
12
13
14

#include "build/build_config.h"

// The entry point for all invocations of Chromium, browser and renderer. On
// windows, this does nothing but load chrome.dll and invoke its entry point in
// order to make it easy to update the app from GoogleUpdate. We don't need
// that extra layer with on linux.

extern "C" {
  int ChromeMain(int argc, const char** argv);
}

int main(int argc, const char** argv) {
    return ChromeMain(argc, argv);
}

其中ChromeMain(int,char*[])定义在同一目录下的chrome_main.cc中

chrome_main.cc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

#include "chrome/app/chrome_main_delegate.h"

#include "content/public/app/content_main.h"

#if defined(OS_WIN)
#define DLLEXPORT __declspec(dllexport)

// We use extern C for the prototype DLLEXPORT to avoid C++ name mangling.
extern "C" {
DLLEXPORT int __cdecl ChromeMain(HINSTANCE instance,
sandbox::SandboxInterfaceInfo* sandbox_info);
}
#elif defined(OS_POSIX)
extern "C" {
__attribute__((visibility("default")))
int ChromeMain(int argc, const char** argv);
}
#endif

#if defined(OS_WIN)
DLLEXPORT int __cdecl ChromeMain(HINSTANCE instance,
sandbox::SandboxInterfaceInfo* sandbox_info) {
ChromeMainDelegate chrome_main_delegate;
return content::ContentMain(instance, sandbox_info, &chrome_main_delegate);
#elif defined(OS_POSIX)
int ChromeMain(int argc, const char** argv) {
ChromeMainDelegate chrome_main_delegate;
return content::ContentMain(argc, argv, &chrome_main_delegate);
#endif
}

ChromeMainDelegate继承自ContentMainDelegate主要提供启动相关函数以及进程 调用处理。其只是将父类函数提供一个简单的实现

其中content::ContentMain(argc, argv, &chrome_main_delegate); 负责主要循环，初始化环境，启动Run函数，退出并返回错误值，其定义如下

content_main.cc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38

#include "content/public/app/content_main.h"

#include "base/memory/scoped_ptr.h"
#include "content/public/app/content_main_runner.h"

namespace content {

#if defined(OS_WIN)
int ContentMain(HINSTANCE instance,
                sandbox::SandboxInterfaceInfo* sandbox_info,
                              ContentMainDelegate* delegate) {
#else
  int ContentMain(int argc,
                  const char** argv,
                                  ContentMainDelegate* delegate) {
#endif  // OS_WIN

        scoped_ptr<ContentMainRunner> main_runner(ContentMainRunner::Create());

          int exit_code;

#if defined(OS_WIN)
  exit_code = main_runner->Initialize(instance, sandbox_info, delegate);
#else
    exit_code = main_runner->Initialize(argc, argv, delegate);
#endif  // OS_WIN

    if (exit_code >= 0)
            return exit_code;

              exit_code = main_runner->Run();

                main_runner->Shutdown();

                  return exit_code;
  }

}  // namespace content

Comments