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/* plugin-api.h -- External linker plugin API.  */

/* Copyright 2009 Free Software Foundation, Inc.

   Written by Cary Coutant <ccoutant@google.com>.

   This file is part of binutils.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,

   MA 02110-1301, USA.  */

/* This file defines the interface for writing a linker plugin, which is

   described at < http://gcc.gnu.org/wiki/whopr/driver >.  */

#ifndef PLUGIN_API_H

#define PLUGIN_API_H

#include <stdint.h>

#include <sys/types.h>

#ifdef __cplusplus

extern "C"

{

#endif

/* Status code returned by most API routines.  */

enum ld_plugin_status

{

  LDPS_OK = 0,

  LDPS_NO_SYMS,         /* Attempt to get symbols that haven't been added. */

  LDPS_BAD_HANDLE,      /* No claimed object associated with given handle. */

  LDPS_ERR

  /* Additional Error codes TBD.  */

};

/* The version of the API specification.  */

enum ld_plugin_api_version

{

  LD_PLUGIN_API_VERSION = 1

};

/* The type of output file being generated by the linker.  */

enum ld_plugin_output_file_type

{

  LDPO_REL,

  LDPO_EXEC,

  LDPO_DYN

};

/* An input file managed by the plugin library.  */

struct ld_plugin_input_file

{

  const char *name;

  int fd;

  off_t offset;

  off_t filesize;

  void *handle;

};

/* A symbol belonging to an input file managed by the plugin library.  */

struct ld_plugin_symbol

{

  char *name;

  char *version;

  int def;

  int visibility;

  uint64_t size;

  char *comdat_key;

  int resolution;

};

/* Whether the symbol is a definition, reference, or common, weak or not.  */

enum ld_plugin_symbol_kind

{

  LDPK_DEF,

  LDPK_WEAKDEF,

  LDPK_UNDEF,

  LDPK_WEAKUNDEF,

  LDPK_COMMON

};

/* The visibility of the symbol.  */

enum ld_plugin_symbol_visibility

{

  LDPV_DEFAULT,

  LDPV_PROTECTED,

  LDPV_INTERNAL,

  LDPV_HIDDEN

};

/* How a symbol is resolved.  */

enum ld_plugin_symbol_resolution

{

  LDPR_UNKNOWN = 0,

  /* Symbol is still undefined at this point.  */

  LDPR_UNDEF,

  /* This is the prevailing definition of the symbol, with references from

     regular object code.  */

  LDPR_PREVAILING_DEF,

  /* This is the prevailing definition of the symbol, with no

     references from regular objects.  It is only referenced from IR

     code.  */

  LDPR_PREVAILING_DEF_IRONLY,

  /* This definition was pre-empted by a definition in a regular

     object file.  */

  LDPR_PREEMPTED_REG,

  /* This definition was pre-empted by a definition in another IR file.  */

  LDPR_PREEMPTED_IR,

  /* This symbol was resolved by a definition in another IR file.  */

  LDPR_RESOLVED_IR,

  /* This symbol was resolved by a definition in a regular object

     linked into the main executable.  */

  LDPR_RESOLVED_EXEC,

  /* This symbol was resolved by a definition in a shared object.  */

  LDPR_RESOLVED_DYN

};

/* The plugin library's "claim file" handler.  */

typedef

enum ld_plugin_status

(*ld_plugin_claim_file_handler) (

  const struct ld_plugin_input_file *file, int *claimed);

/* The plugin library's "all symbols read" handler.  */

typedef

enum ld_plugin_status

(*ld_plugin_all_symbols_read_handler) (void);

/* The plugin library's cleanup handler.  */

typedef

enum ld_plugin_status

(*ld_plugin_cleanup_handler) (void);

/* The linker's interface for registering the "claim file" handler.  */

typedef

enum ld_plugin_status

(*ld_plugin_register_claim_file) (ld_plugin_claim_file_handler handler);

/* The linker's interface for registering the "all symbols read" handler.  */

typedef

enum ld_plugin_status

(*ld_plugin_register_all_symbols_read) (

  ld_plugin_all_symbols_read_handler handler);

/* The linker's interface for registering the cleanup handler.  */

typedef

enum ld_plugin_status

(*ld_plugin_register_cleanup) (ld_plugin_cleanup_handler handler);

/* The linker's interface for adding symbols from a claimed input file.  */

typedef

enum ld_plugin_status

(*ld_plugin_add_symbols) (void *handle, int nsyms,

                          const struct ld_plugin_symbol *syms);

/* The linker's interface for getting the input file information with

   an open (possibly re-opened) file descriptor.  */

typedef

enum ld_plugin_status

(*ld_plugin_get_input_file) (const void *handle,

                             struct ld_plugin_input_file *file);

/* The linker's interface for releasing the input file.  */

typedef

enum ld_plugin_status

(*ld_plugin_release_input_file) (const void *handle);

/* The linker's interface for retrieving symbol resolution information.  */

typedef

enum ld_plugin_status

(*ld_plugin_get_symbols) (const void *handle, int nsyms,

                          struct ld_plugin_symbol *syms);

/* The linker's interface for adding a compiled input file.  */

typedef

enum ld_plugin_status

(*ld_plugin_add_input_file) (char *pathname);

/* The linker's interface for adding a library that should be searched.  */

typedef

enum ld_plugin_status

(*ld_plugin_add_input_library) (char *libname);

/* The linker's interface for issuing a warning or error message.  */

typedef

enum ld_plugin_status

(*ld_plugin_message) (int level, const char *format, ...);

enum ld_plugin_level

{

  LDPL_INFO,

  LDPL_WARNING,

  LDPL_ERROR,

  LDPL_FATAL

};

/* Values for the tv_tag field of the transfer vector.  */

enum ld_plugin_tag

{

  LDPT_NULL = 0,

  LDPT_API_VERSION,

  LDPT_GOLD_VERSION,

  LDPT_LINKER_OUTPUT,

  LDPT_OPTION,

  LDPT_REGISTER_CLAIM_FILE_HOOK,

  LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK,

  LDPT_REGISTER_CLEANUP_HOOK,

  LDPT_ADD_SYMBOLS,

  LDPT_GET_SYMBOLS,

  LDPT_ADD_INPUT_FILE,

  LDPT_MESSAGE,

  LDPT_GET_INPUT_FILE,

  LDPT_RELEASE_INPUT_FILE,

  LDPT_ADD_INPUT_LIBRARY

};

/* The plugin transfer vector.  */

struct ld_plugin_tv

{

  enum ld_plugin_tag tv_tag;

  union

  {

    int tv_val;

    const char *tv_string;

    ld_plugin_register_claim_file tv_register_claim_file;

    ld_plugin_register_all_symbols_read tv_register_all_symbols_read;

    ld_plugin_register_cleanup tv_register_cleanup;

    ld_plugin_add_symbols tv_add_symbols;

    ld_plugin_get_symbols tv_get_symbols;

    ld_plugin_add_input_file tv_add_input_file;

    ld_plugin_message tv_message;

    ld_plugin_get_input_file tv_get_input_file;

    ld_plugin_release_input_file tv_release_input_file;

    ld_plugin_add_input_library tv_add_input_library;

  } tv_u;

};

/* The plugin library's "onload" entry point.  */

typedef

enum ld_plugin_status

(*ld_plugin_onload) (struct ld_plugin_tv *tv);

#ifdef __cplusplus

}

#endif

#endif /* !defined(PLUGIN_API_H) */