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/* test_plugin.c -- simple linker plugin test

   Copyright 2008, 2009 Free Software Foundation, Inc.

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

   This file is part of gold.

   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.  */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "plugin-api.h"

struct claimed_file

{

  const char* name;

  void* handle;

  int nsyms;

  struct ld_plugin_symbol* syms;

  struct claimed_file* next;

};

struct sym_info

{

  int size;

  char* type;

  char* bind;

  char* vis;

  char* sect;

  char* name;

};

static struct claimed_file* first_claimed_file = NULL;

static struct claimed_file* last_claimed_file = NULL;

static ld_plugin_register_claim_file register_claim_file_hook = NULL;

static ld_plugin_register_all_symbols_read register_all_symbols_read_hook = NULL;

static ld_plugin_register_cleanup register_cleanup_hook = NULL;

static ld_plugin_add_symbols add_symbols = NULL;

static ld_plugin_get_symbols get_symbols = NULL;

static ld_plugin_add_input_file add_input_file = NULL;

static ld_plugin_message message = NULL;

static ld_plugin_get_input_file get_input_file = NULL;

static ld_plugin_release_input_file release_input_file = NULL;

#define MAXOPTS 10

static const char *opts[MAXOPTS];

static int nopts = 0;

enum ld_plugin_status onload(struct ld_plugin_tv *tv);

enum ld_plugin_status claim_file_hook(const struct ld_plugin_input_file *file,

                                      int *claimed);

enum ld_plugin_status all_symbols_read_hook(void);

enum ld_plugin_status cleanup_hook(void);

static void parse_readelf_line(char*, struct sym_info*);

enum ld_plugin_status

onload(struct ld_plugin_tv *tv)

{

  struct ld_plugin_tv *entry;

  int api_version = 0;

  int gold_version = 0;

  int i;

  for (entry = tv; entry->tv_tag != LDPT_NULL; ++entry)

    {

      switch (entry->tv_tag)

        {

        case LDPT_API_VERSION:

          api_version = entry->tv_u.tv_val;

          break;

        case LDPT_GOLD_VERSION:

          gold_version = entry->tv_u.tv_val;

          break;

        case LDPT_LINKER_OUTPUT:

          break;

        case LDPT_OPTION:

          if (nopts < MAXOPTS)

            opts[nopts++] = entry->tv_u.tv_string;

          break;

        case LDPT_REGISTER_CLAIM_FILE_HOOK:

          register_claim_file_hook = entry->tv_u.tv_register_claim_file;

          break;

        case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK:

          register_all_symbols_read_hook =

            entry->tv_u.tv_register_all_symbols_read;

          break;

        case LDPT_REGISTER_CLEANUP_HOOK:

          register_cleanup_hook = entry->tv_u.tv_register_cleanup;

          break;

        case LDPT_ADD_SYMBOLS:

          add_symbols = entry->tv_u.tv_add_symbols;

          break;

        case LDPT_GET_SYMBOLS:

          get_symbols = entry->tv_u.tv_get_symbols;

          break;

        case LDPT_ADD_INPUT_FILE:

          add_input_file = entry->tv_u.tv_add_input_file;

          break;

        case LDPT_MESSAGE:

          message = entry->tv_u.tv_message;

          break;

        case LDPT_GET_INPUT_FILE:

          get_input_file = entry->tv_u.tv_get_input_file;

          break;

        case LDPT_RELEASE_INPUT_FILE:

          release_input_file = entry->tv_u.tv_release_input_file;

          break;

        default:

          break;

        }

    }

  if (message == NULL)

    {

      fprintf(stderr, "tv_message interface missing\n");

      return LDPS_ERR;

    }

  if (register_claim_file_hook == NULL)

    {

      fprintf(stderr, "tv_register_claim_file_hook interface missing\n");

      return LDPS_ERR;

    }

  if (register_all_symbols_read_hook == NULL)

    {

      fprintf(stderr, "tv_register_all_symbols_read_hook interface missing\n");

      return LDPS_ERR;

    }

  if (register_cleanup_hook == NULL)

    {

      fprintf(stderr, "tv_register_cleanup_hook interface missing\n");

      return LDPS_ERR;

    }

  (*message)(LDPL_INFO, "API version:   %d", api_version);

  (*message)(LDPL_INFO, "gold version:  %d", gold_version);

  for (i = 0; i < nopts; ++i)

    (*message)(LDPL_INFO, "option: %s", opts[i]);

  if ((*register_claim_file_hook)(claim_file_hook) != LDPS_OK)

    {

      (*message)(LDPL_ERROR, "error registering claim file hook");

      return LDPS_ERR;

    }

  if ((*register_all_symbols_read_hook)(all_symbols_read_hook) != LDPS_OK)

    {

      (*message)(LDPL_ERROR, "error registering all symbols read hook");

      return LDPS_ERR;

    }

  if ((*register_cleanup_hook)(cleanup_hook) != LDPS_OK)

    {

      (*message)(LDPL_ERROR, "error registering cleanup hook");

      return LDPS_ERR;

    }

  return LDPS_OK;

}

enum ld_plugin_status

claim_file_hook (const struct ld_plugin_input_file* file, int* claimed)

{

  int len;

  off_t end_offset;

  char buf[160];

  struct claimed_file* claimed_file;

  struct ld_plugin_symbol* syms;

  int nsyms = 0;

  int maxsyms = 0;

  FILE* irfile;

  struct sym_info info;

  int weak;

  int def;

  int vis;

  int is_comdat;

  int i;

  (*message)(LDPL_INFO,

             "%s: claim file hook called (offset = %ld, size = %ld)",

             file->name, (long)file->offset, (long)file->filesize);

  /* Look for the beginning of output from readelf -s.  */

  irfile = fdopen(file->fd, "r");

  (void)fseek(irfile, file->offset, SEEK_SET);

  end_offset = file->offset + file->filesize;

  len = fread(buf, 1, 13, irfile);

  if (len < 13 || strncmp(buf, "\nSymbol table", 13) != 0)

    return LDPS_OK;

  /* Skip the two header lines.  */

  (void) fgets(buf, sizeof(buf), irfile);

  (void) fgets(buf, sizeof(buf), irfile);

  if (add_symbols == NULL)

    {

      fprintf(stderr, "tv_add_symbols interface missing\n");

      return LDPS_ERR;

    }

  /* Parse the output from readelf. The columns are:

     Index Value Size Type Binding Visibility Section Name.  */

  syms = (struct ld_plugin_symbol*)malloc(sizeof(struct ld_plugin_symbol) * 8);

  if (syms == NULL)

    return LDPS_ERR;

  maxsyms = 8;

  while (ftell(irfile) < end_offset

         && fgets(buf, sizeof(buf), irfile) != NULL)

    {

      parse_readelf_line(buf, &info);

      /* Ignore local symbols.  */

      if (strncmp(info.bind, "LOCAL", 5) == 0)

        continue;

      weak = strncmp(info.bind, "WEAK", 4) == 0;

      if (strncmp(info.sect, "UND", 3) == 0)

        def = weak ? LDPK_WEAKUNDEF : LDPK_UNDEF;

      else if (strncmp(info.sect, "COM", 3) == 0)

        def = LDPK_COMMON;

      else

        def = weak ? LDPK_WEAKDEF : LDPK_DEF;

      if (strncmp(info.vis, "INTERNAL", 8) == 0)

        vis = LDPV_INTERNAL;

      else if (strncmp(info.vis, "HIDDEN", 6) == 0)

        vis = LDPV_HIDDEN;

      else if (strncmp(info.vis, "PROTECTED", 9) == 0)

        vis = LDPV_PROTECTED;

      else

        vis = LDPV_DEFAULT;

      /* If the symbol is listed in the options list, special-case

         it as a comdat symbol.  */

      is_comdat = 0;

      for (i = 0; i < nopts; ++i)

        {

          if (info.name != NULL && strcmp(info.name, opts[i]) == 0)

            {

              is_comdat = 1;

              break;

            }

        }

      if (nsyms >= maxsyms)

        {

          syms = (struct ld_plugin_symbol*)

            realloc(syms, sizeof(struct ld_plugin_symbol) * maxsyms * 2);

          if (syms == NULL)

            return LDPS_ERR;

          maxsyms *= 2;

        }

      if (info.name == NULL)

        syms[nsyms].name = NULL;

      else

        {

          len = strlen(info.name);

          syms[nsyms].name = malloc(len + 1);

          strncpy(syms[nsyms].name, info.name, len + 1);

        }

      syms[nsyms].version = NULL;

      syms[nsyms].def = def;

      syms[nsyms].visibility = vis;

      syms[nsyms].size = info.size;

      syms[nsyms].comdat_key = is_comdat ? syms[nsyms].name : NULL;

      syms[nsyms].resolution = LDPR_UNKNOWN;

      ++nsyms;

    }

  claimed_file = (struct claimed_file*) malloc(sizeof(struct claimed_file));

  if (claimed_file == NULL)

    return LDPS_ERR;

  claimed_file->name = file->name;

  claimed_file->handle = file->handle;

  claimed_file->nsyms = nsyms;

  claimed_file->syms = syms;

  claimed_file->next = NULL;

  if (last_claimed_file == NULL)

    first_claimed_file = claimed_file;

  else

    last_claimed_file->next = claimed_file;

  last_claimed_file = claimed_file;

  (*message)(LDPL_INFO, "%s: claiming file, adding %d symbols",

             file->name, nsyms);

  if (nsyms > 0)

    (*add_symbols)(file->handle, nsyms, syms);

  *claimed = 1;

  return LDPS_OK;

}

enum ld_plugin_status

all_symbols_read_hook(void)

{

  int i;

  const char* res;

  struct claimed_file* claimed_file;

  struct ld_plugin_input_file file;

  FILE* irfile;

  off_t end_offset;

  struct sym_info info;

  int len;

  char buf[160];

  char* p;

  const char* filename;

  (*message)(LDPL_INFO, "all symbols read hook called");

  if (get_symbols == NULL)

    {

      fprintf(stderr, "tv_get_symbols interface missing\n");

      return LDPS_ERR;

    }

  for (claimed_file = first_claimed_file;

       claimed_file != NULL;

       claimed_file = claimed_file->next)

    {

      (*get_symbols)(claimed_file->handle, claimed_file->nsyms,

                     claimed_file->syms);

      for (i = 0; i < claimed_file->nsyms; ++i)

        {

          switch (claimed_file->syms[i].resolution)

            {

            case LDPR_UNKNOWN:

              res = "UNKNOWN";

              break;

            case LDPR_UNDEF:

              res = "UNDEF";

              break;

            case LDPR_PREVAILING_DEF:

              res = "PREVAILING_DEF_REG";

              break;

            case LDPR_PREVAILING_DEF_IRONLY:

              res = "PREVAILING_DEF_IRONLY";

              break;

            case LDPR_PREEMPTED_REG:

              res = "PREEMPTED_REG";

              break;

            case LDPR_PREEMPTED_IR:

              res = "PREEMPTED_IR";

              break;

            case LDPR_RESOLVED_IR:

              res = "RESOLVED_IR";

              break;

            case LDPR_RESOLVED_EXEC:

              res = "RESOLVED_EXEC";

              break;

            case LDPR_RESOLVED_DYN:

              res = "RESOLVED_DYN";

              break;

            default:

              res = "?";

              break;

            }

          (*message)(LDPL_INFO, "%s: %s: %s", claimed_file->name,

                     claimed_file->syms[i].name, res);

        }

    }

  if (add_input_file == NULL)

    {

      fprintf(stderr, "tv_add_input_file interface missing\n");

      return LDPS_ERR;

    }

  if (get_input_file == NULL)

    {

      fprintf(stderr, "tv_get_input_file interface missing\n");

      return LDPS_ERR;

    }

  if (release_input_file == NULL)

    {

      fprintf(stderr, "tv_release_input_file interface missing\n");

      return LDPS_ERR;

    }

  for (claimed_file = first_claimed_file;

       claimed_file != NULL;

       claimed_file = claimed_file->next)

    {

      (*get_input_file) (claimed_file->handle, &file);

      /* Look for the beginning of output from readelf -s.  */

      irfile = fdopen(file.fd, "r");

      (void)fseek(irfile, file.offset, SEEK_SET);

      end_offset = file.offset + file.filesize;

      len = fread(buf, 1, 13, irfile);

      if (len < 13 || strncmp(buf, "\nSymbol table", 13) != 0)

        {

          fprintf(stderr, "%s: can't re-read original input file\n",

                  claimed_file->name);

          return LDPS_ERR;

        }

      /* Skip the two header lines.  */

      (void) fgets(buf, sizeof(buf), irfile);

      (void) fgets(buf, sizeof(buf), irfile);

      filename = NULL;

      while (ftell(irfile) < end_offset

             && fgets(buf, sizeof(buf), irfile) != NULL)

        {

          parse_readelf_line(buf, &info);

          /* Look for file name.  */

          if (strncmp(info.type, "FILE", 4) == 0)

            {

              len = strlen(info.name);

              p = malloc(len + 1);

              strncpy(p, info.name, len + 1);

              filename = p;

              break;

            }

        }

      (*release_input_file) (claimed_file->handle);

      if (filename == NULL)

        filename = claimed_file->name;

      if (claimed_file->nsyms == 0)

        continue;

      if (strlen(filename) >= sizeof(buf))

        {

          (*message)(LDPL_FATAL, "%s: filename too long", filename);

          return LDPS_ERR;

        }

      strcpy(buf, filename);

      p = strrchr(buf, '.');

      if (p == NULL

          || (strcmp(p, ".syms") != 0

              && strcmp(p, ".c") != 0

              && strcmp(p, ".cc") != 0))

        {

          (*message)(LDPL_FATAL, "%s: filename has unknown suffix",

                     filename);

          return LDPS_ERR;

        }

      p[1] = 'o';

      p[2] = '\0';

      (*message)(LDPL_INFO, "%s: adding new input file", buf);

      (*add_input_file)(buf);

    }

  return LDPS_OK;

}

enum ld_plugin_status

cleanup_hook(void)

{

  (*message)(LDPL_INFO, "cleanup hook called");

  return LDPS_OK;

}

static void

parse_readelf_line(char* p, struct sym_info* info)

{

  int len;

  p += strspn(p, " ");

  /* Index field.  */

  p += strcspn(p, " ");

  p += strspn(p, " ");

  /* Value field.  */

  p += strcspn(p, " ");

  p += strspn(p, " ");

  /* Size field.  */

  info->size = atoi(p);

  p += strcspn(p, " ");

  p += strspn(p, " ");

  /* Type field.  */

  info->type = p;

  p += strcspn(p, " ");

  p += strspn(p, " ");

  /* Binding field.  */

  info->bind = p;

  p += strcspn(p, " ");

  p += strspn(p, " ");

  /* Visibility field.  */

  info->vis = p;

  p += strcspn(p, " ");

  p += strspn(p, " ");

  /* Section field.  */

  info->sect = p;

  p += strcspn(p, " ");

  p += strspn(p, " ");

  /* Name field.  */

  /* FIXME:  Look for version.  */

  len = strlen(p);

  if (len == 0)

    p = NULL;

  else if (p[len-1] == '\n')

    p[--len] = '\0';

  info->name = p;

}