如何注册GIMPLE_PASS？

Question

我试着做一个简单的插件例子，如：

#include "gcc-plugin.h"
#include "tree.h"
#include "gimple.h"
#include "tree-pass.h"
#include <stdio.h>

extern void
test(void*gcc_data, void*b) {
    printf("Hellow world\n");
}

extern int plugin_init (struct plugin_name_args *plugin_info,
                        struct plugin_gcc_version *version)
{
    const char * nombre = "Hello world";
    register_callback(nombre, GIMPLE_PASS, &test, NULL);

    return 0;
}

但是GIMPLE_PASS在gcc-plugin.h中不是一个预定义的事件，我知道我必须在tree-pass.h中使用PLUGIN_PASS_MANAGER_SETUP和struct pass_data来做一些事情，但是我不知道具体的方法，也没有找到任何例子。

有人会教我怎么做？iThanks。

Answer 1

我知道你可能不再需要这个了，但它可能对其他人很有用，我最近一直在做这个工作，而且这方面有0种文档.你所能做的就是找到一些例子(只有很少的例子)，试着理解他们想要做什么(如果注释得很好的话)，我正在编写一个插件--解析gimple代码，下面是我的plugin_init

int plugin_init (plugin_name_args* plugin_info,
             plugin_gcc_version* ver)
{
  // You can get the plugin name
  const char * const plugin_name = plugin_info->base_name;
  cerr << "starting ";
  // here you can get the plugin args and number of args, 
  // look at https://gcc.gnu.org/onlinedocs/gccint/Plugins-loading.html#Plugins-loading
  // for more information how to give your plugin some args
  const int argc = plugin_info->argc;   
  const struct plugin_argument * const argv = plugin_info->argv;
  struct register_pass_info calls_printer_info;

  // Here you say where you need to put your plugin, mine is called after ssa
  // This is my pass
  calls_printer_info.pass                         = new calls_printer_pass();
  calls_printer_info.reference_pass_name          = "ssa" ;
  calls_printer_info.ref_pass_instance_number     = 1;
  calls_printer_info.pos_op                       = PASS_POS_INSERT_AFTER;
  register_callback (plugin_name,
                     PLUGIN_PASS_MANAGER_SETUP,
                     NULL,
                     &calls_printer_info);
  return 0;
}

您需要在以下之前创建您的通行证：

static const struct pass_data calls_printer_pass_data = {
                .type                   = GIMPLE_PASS,
                .name                   = "calls_printer",
                .optinfo_flags          = OPTGROUP_NONE,
                .has_gate               = false,
                .has_execute            = true,
                .tv_id                  = TV_NONE,
                .properties_required    = PROP_cfg,
                .properties_provided    = 0,
                .properties_destroyed   = 0,
                .todo_flags_start       = 0,
                .todo_flags_finish      = 0
};

class calls_printer_pass : public gimple_opt_pass {
public:
        calls_printer_pass() : gimple_opt_pass(calls_printer_pass_data, g) {}
        // put the function you want to execute when the pass is executed
        unsigned int execute() { return my_function(); }
};

别忘了这是许可证：

int plugin_is_GPL_compatible;