622 lines
19 KiB
C
622 lines
19 KiB
C
/* Test plugin for the GNU linker.
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Copyright 2010 Free Software Foundation, Inc.
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This file is part of the GNU Binutils.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "plugin-api.h"
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/* For ARRAY_SIZE macro only - we don't link the library itself. */
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#include "libiberty.h"
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extern enum ld_plugin_status onload (struct ld_plugin_tv *tv);
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static enum ld_plugin_status onclaim_file (const struct ld_plugin_input_file *file,
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int *claimed);
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static enum ld_plugin_status onall_symbols_read (void);
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static enum ld_plugin_status oncleanup (void);
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/* Helper for calling plugin api message function. */
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#define TV_MESSAGE if (tv_message) (*tv_message)
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/* Struct for recording files to claim / files claimed. */
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typedef struct claim_file
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{
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struct claim_file *next;
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struct ld_plugin_input_file file;
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bfd_boolean claimed;
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struct ld_plugin_symbol *symbols;
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int n_syms_allocated;
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int n_syms_used;
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} claim_file_t;
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/* Types of things that can be added at all symbols read time. */
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typedef enum addfile_enum
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{
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ADD_FILE,
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ADD_LIB,
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ADD_DIR
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} addfile_enum_t;
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/* Struct for recording files to add to final link. */
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typedef struct add_file
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{
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struct add_file *next;
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const char *name;
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addfile_enum_t type;
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} add_file_t;
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/* Helper macro for defining array of transfer vector tags and names. */
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#define ADDENTRY(tag) { tag, #tag }
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/* Struct for looking up human-readable versions of tag names. */
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typedef struct tag_name
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{
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enum ld_plugin_tag tag;
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const char *name;
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} tag_name_t;
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/* Array of all known tags and their names. */
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static const tag_name_t tag_names[] =
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{
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ADDENTRY(LDPT_NULL),
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ADDENTRY(LDPT_API_VERSION),
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ADDENTRY(LDPT_GOLD_VERSION),
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ADDENTRY(LDPT_LINKER_OUTPUT),
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ADDENTRY(LDPT_OPTION),
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ADDENTRY(LDPT_REGISTER_CLAIM_FILE_HOOK),
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ADDENTRY(LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK),
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ADDENTRY(LDPT_REGISTER_CLEANUP_HOOK),
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ADDENTRY(LDPT_ADD_SYMBOLS),
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ADDENTRY(LDPT_GET_SYMBOLS),
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ADDENTRY(LDPT_GET_SYMBOLS_V2),
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ADDENTRY(LDPT_ADD_INPUT_FILE),
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ADDENTRY(LDPT_MESSAGE),
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ADDENTRY(LDPT_GET_INPUT_FILE),
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ADDENTRY(LDPT_RELEASE_INPUT_FILE),
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ADDENTRY(LDPT_ADD_INPUT_LIBRARY),
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ADDENTRY(LDPT_OUTPUT_NAME),
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ADDENTRY(LDPT_SET_EXTRA_LIBRARY_PATH),
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ADDENTRY(LDPT_GNU_LD_VERSION)
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};
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/* Function pointers to cache hooks passed at onload time. */
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static ld_plugin_register_claim_file tv_register_claim_file = 0;
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static ld_plugin_register_all_symbols_read tv_register_all_symbols_read = 0;
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static ld_plugin_register_cleanup tv_register_cleanup = 0;
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static ld_plugin_add_symbols tv_add_symbols = 0;
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static ld_plugin_get_symbols tv_get_symbols = 0;
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static ld_plugin_get_symbols tv_get_symbols_v2 = 0;
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static ld_plugin_add_input_file tv_add_input_file = 0;
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static ld_plugin_message tv_message = 0;
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static ld_plugin_get_input_file tv_get_input_file = 0;
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static ld_plugin_release_input_file tv_release_input_file = 0;
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static ld_plugin_add_input_library tv_add_input_library = 0;
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static ld_plugin_set_extra_library_path tv_set_extra_library_path = 0;
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/* Other cached info from the transfer vector. */
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static enum ld_plugin_output_file_type linker_output;
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static const char *output_name;
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/* Behaviour control flags set by plugin options. */
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static enum ld_plugin_status onload_ret = LDPS_OK;
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static enum ld_plugin_status claim_file_ret = LDPS_OK;
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static enum ld_plugin_status all_symbols_read_ret = LDPS_OK;
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static enum ld_plugin_status cleanup_ret = LDPS_OK;
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static bfd_boolean register_claimfile_hook = FALSE;
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static bfd_boolean register_allsymbolsread_hook = FALSE;
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static bfd_boolean register_cleanup_hook = FALSE;
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static bfd_boolean dumpresolutions = FALSE;
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/* The master list of all claimable/claimed files. */
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static claim_file_t *claimfiles_list = NULL;
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/* We keep a tail pointer for easy linking on the end. */
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static claim_file_t **claimfiles_tail_chain_ptr = &claimfiles_list;
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/* The last claimed file added to the list, for receiving syms. */
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static claim_file_t *last_claimfile = NULL;
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/* The master list of all files to add to the final link. */
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static add_file_t *addfiles_list = NULL;
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/* We keep a tail pointer for easy linking on the end. */
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static add_file_t **addfiles_tail_chain_ptr = &addfiles_list;
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/* Add a new claimfile on the end of the chain. */
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static enum ld_plugin_status
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record_claim_file (const char *file)
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{
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claim_file_t *newfile;
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newfile = malloc (sizeof *newfile);
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if (!newfile)
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return LDPS_ERR;
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memset (newfile, 0, sizeof *newfile);
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/* Only setup for now is remembering the name to look for. */
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newfile->file.name = file;
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/* Chain it on the end of the list. */
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*claimfiles_tail_chain_ptr = newfile;
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claimfiles_tail_chain_ptr = &newfile->next;
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/* Record it as active for receiving symbols to register. */
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last_claimfile = newfile;
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return LDPS_OK;
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}
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/* Add a new addfile on the end of the chain. */
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static enum ld_plugin_status
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record_add_file (const char *file, addfile_enum_t type)
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{
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add_file_t *newfile;
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newfile = malloc (sizeof *newfile);
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if (!newfile)
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return LDPS_ERR;
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newfile->next = NULL;
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newfile->name = file;
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newfile->type = type;
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/* Chain it on the end of the list. */
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*addfiles_tail_chain_ptr = newfile;
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addfiles_tail_chain_ptr = &newfile->next;
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return LDPS_OK;
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}
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/* Parse a command-line argument string into a symbol definition.
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Symbol-strings follow the colon-separated format:
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NAME:VERSION:def:vis:size:COMDATKEY
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where the fields in capitals are strings and those in lower
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case are integers. We don't allow to specify a resolution as
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doing so is not meaningful when calling the add symbols hook. */
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static enum ld_plugin_status
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parse_symdefstr (const char *str, struct ld_plugin_symbol *sym)
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{
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int n;
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long long size;
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const char *colon1, *colon2, *colon5;
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/* Locate the colons separating the first two strings. */
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colon1 = strchr (str, ':');
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if (!colon1)
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return LDPS_ERR;
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colon2 = strchr (colon1+1, ':');
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if (!colon2)
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return LDPS_ERR;
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/* Name must not be empty (version may be). */
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if (colon1 == str)
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return LDPS_ERR;
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/* The fifth colon and trailing comdat key string are optional,
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but the intermediate ones must all be present. */
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colon5 = strchr (colon2+1, ':'); /* Actually only third so far. */
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if (!colon5)
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return LDPS_ERR;
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colon5 = strchr (colon5+1, ':'); /* Hopefully fourth now. */
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if (!colon5)
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return LDPS_ERR;
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colon5 = strchr (colon5+1, ':'); /* Optional fifth now. */
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/* Finally we'll use sscanf to parse the numeric fields, then
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we'll split out the strings which we need to allocate separate
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storage for anyway so that we can add nul termination. */
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n = sscanf (colon2 + 1, "%i:%i:%lli", &sym->def, &sym->visibility, &size);
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if (n != 3)
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return LDPS_ERR;
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/* Parsed successfully, so allocate strings and fill out fields. */
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sym->size = size;
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sym->resolution = LDPR_UNKNOWN;
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sym->name = malloc (colon1 - str + 1);
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if (!sym->name)
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return LDPS_ERR;
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memcpy (sym->name, str, colon1 - str);
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sym->name[colon1 - str] = '\0';
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if (colon2 > (colon1 + 1))
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{
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sym->version = malloc (colon2 - colon1);
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if (!sym->version)
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return LDPS_ERR;
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memcpy (sym->version, colon1 + 1, colon2 - (colon1 + 1));
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sym->version[colon2 - (colon1 + 1)] = '\0';
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}
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else
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sym->version = NULL;
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if (colon5 && colon5[1])
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{
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sym->comdat_key = malloc (strlen (colon5 + 1) + 1);
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if (!sym->comdat_key)
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return LDPS_ERR;
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strcpy (sym->comdat_key, colon5 + 1);
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}
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else
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sym->comdat_key = 0;
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return LDPS_OK;
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}
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/* Record a symbol to be added for the last-added claimfile. */
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static enum ld_plugin_status
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record_claimed_file_symbol (const char *symdefstr)
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{
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struct ld_plugin_symbol sym;
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/* Can't add symbols except as belonging to claimed files. */
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if (!last_claimfile)
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return LDPS_ERR;
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/* If string doesn't parse correctly, give an error. */
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if (parse_symdefstr (symdefstr, &sym) != LDPS_OK)
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return LDPS_ERR;
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/* Check for enough space, resize array if needed, and add it. */
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if (last_claimfile->n_syms_allocated == last_claimfile->n_syms_used)
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{
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int new_n_syms = last_claimfile->n_syms_allocated
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? 2 * last_claimfile->n_syms_allocated
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: 10;
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last_claimfile->symbols = realloc (last_claimfile->symbols,
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new_n_syms * sizeof *last_claimfile->symbols);
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if (!last_claimfile->symbols)
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return LDPS_ERR;
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last_claimfile->n_syms_allocated = new_n_syms;
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}
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last_claimfile->symbols[last_claimfile->n_syms_used++] = sym;
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return LDPS_OK;
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}
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/* Records the status to return from one of the registered hooks. */
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static enum ld_plugin_status
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set_ret_val (const char *whichval, enum ld_plugin_status retval)
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{
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if (!strcmp ("onload", whichval))
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onload_ret = retval;
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else if (!strcmp ("claimfile", whichval))
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claim_file_ret = retval;
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else if (!strcmp ("allsymbolsread", whichval))
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all_symbols_read_ret = retval;
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else if (!strcmp ("cleanup", whichval))
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cleanup_ret = retval;
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else
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return LDPS_ERR;
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return LDPS_OK;
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}
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/* Records hooks which should be registered. */
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static enum ld_plugin_status
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set_register_hook (const char *whichhook, bfd_boolean yesno)
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{
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if (!strcmp ("claimfile", whichhook))
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register_claimfile_hook = yesno;
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else if (!strcmp ("allsymbolsread", whichhook))
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register_allsymbolsread_hook = yesno;
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else if (!strcmp ("cleanup", whichhook))
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register_cleanup_hook = yesno;
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else
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return LDPS_ERR;
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return LDPS_OK;
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}
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/* Determine type of plugin option and pass to individual parsers. */
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static enum ld_plugin_status
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parse_option (const char *opt)
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{
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if (!strncmp ("fail", opt, 4))
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return set_ret_val (opt + 4, LDPS_ERR);
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else if (!strncmp ("pass", opt, 4))
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return set_ret_val (opt + 4, LDPS_OK);
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else if (!strncmp ("register", opt, 8))
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return set_register_hook (opt + 8, TRUE);
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else if (!strncmp ("noregister", opt, 10))
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return set_register_hook (opt + 10, FALSE);
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else if (!strncmp ("claim:", opt, 6))
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return record_claim_file (opt + 6);
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else if (!strncmp ("sym:", opt, 4))
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return record_claimed_file_symbol (opt + 4);
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else if (!strncmp ("add:", opt, 4))
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return record_add_file (opt + 4, ADD_FILE);
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else if (!strncmp ("lib:", opt, 4))
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return record_add_file (opt + 4, ADD_LIB);
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else if (!strncmp ("dir:", opt, 4))
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return record_add_file (opt + 4, ADD_DIR);
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else if (!strcmp ("dumpresolutions", opt))
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dumpresolutions = TRUE;
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else
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return LDPS_ERR;
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return LDPS_OK;
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}
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/* Output contents of transfer vector array entry in human-readable form. */
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static void
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dump_tv_tag (size_t n, struct ld_plugin_tv *tv)
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{
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size_t tag;
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char unknownbuf[40];
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const char *name;
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for (tag = 0; tag < ARRAY_SIZE (tag_names); tag++)
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if (tag_names[tag].tag == tv->tv_tag)
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break;
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sprintf (unknownbuf, "unknown tag #%d", tv->tv_tag);
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name = (tag < ARRAY_SIZE (tag_names)) ? tag_names[tag].name : unknownbuf;
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switch (tv->tv_tag)
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{
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case LDPT_OPTION:
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case LDPT_OUTPUT_NAME:
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TV_MESSAGE (LDPL_INFO, "tv[%d]: %s '%s'", n, name,
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tv->tv_u.tv_string);
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break;
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case LDPT_REGISTER_CLAIM_FILE_HOOK:
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case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK:
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case LDPT_REGISTER_CLEANUP_HOOK:
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case LDPT_ADD_SYMBOLS:
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case LDPT_GET_SYMBOLS:
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case LDPT_GET_SYMBOLS_V2:
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case LDPT_ADD_INPUT_FILE:
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case LDPT_MESSAGE:
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case LDPT_GET_INPUT_FILE:
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case LDPT_RELEASE_INPUT_FILE:
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case LDPT_ADD_INPUT_LIBRARY:
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case LDPT_SET_EXTRA_LIBRARY_PATH:
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TV_MESSAGE (LDPL_INFO, "tv[%d]: %s func@0x%p", n, name,
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(void *)(tv->tv_u.tv_message));
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break;
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case LDPT_NULL:
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case LDPT_API_VERSION:
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case LDPT_GOLD_VERSION:
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case LDPT_LINKER_OUTPUT:
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case LDPT_GNU_LD_VERSION:
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default:
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TV_MESSAGE (LDPL_INFO, "tv[%d]: %s value %W (%d)", n, name,
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(bfd_vma)tv->tv_u.tv_val, tv->tv_u.tv_val);
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break;
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}
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}
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/* Handle/record information received in a transfer vector entry. */
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static enum ld_plugin_status
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parse_tv_tag (struct ld_plugin_tv *tv)
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{
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#define SETVAR(x) x = tv->tv_u.x
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switch (tv->tv_tag)
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{
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case LDPT_OPTION:
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return parse_option (tv->tv_u.tv_string);
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case LDPT_NULL:
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case LDPT_GOLD_VERSION:
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case LDPT_GNU_LD_VERSION:
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case LDPT_API_VERSION:
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default:
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break;
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case LDPT_OUTPUT_NAME:
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output_name = tv->tv_u.tv_string;
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break;
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case LDPT_LINKER_OUTPUT:
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linker_output = tv->tv_u.tv_val;
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break;
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case LDPT_REGISTER_CLAIM_FILE_HOOK:
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SETVAR(tv_register_claim_file);
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break;
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case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK:
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SETVAR(tv_register_all_symbols_read);
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break;
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case LDPT_REGISTER_CLEANUP_HOOK:
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SETVAR(tv_register_cleanup);
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break;
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case LDPT_ADD_SYMBOLS:
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SETVAR(tv_add_symbols);
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break;
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case LDPT_GET_SYMBOLS:
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SETVAR(tv_get_symbols);
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break;
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case LDPT_GET_SYMBOLS_V2:
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tv_get_symbols_v2 = tv->tv_u.tv_get_symbols;
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break;
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case LDPT_ADD_INPUT_FILE:
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SETVAR(tv_add_input_file);
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break;
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case LDPT_MESSAGE:
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SETVAR(tv_message);
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break;
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case LDPT_GET_INPUT_FILE:
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SETVAR(tv_get_input_file);
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break;
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case LDPT_RELEASE_INPUT_FILE:
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SETVAR(tv_release_input_file);
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break;
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case LDPT_ADD_INPUT_LIBRARY:
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SETVAR(tv_add_input_library);
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break;
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case LDPT_SET_EXTRA_LIBRARY_PATH:
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SETVAR(tv_set_extra_library_path);
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break;
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}
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#undef SETVAR
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return LDPS_OK;
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}
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/* Record any useful information in transfer vector entry and display
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it in human-readable form using the plugin API message() callback. */
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enum ld_plugin_status
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parse_and_dump_tv_tag (size_t n, struct ld_plugin_tv *tv)
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{
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enum ld_plugin_status rv = parse_tv_tag (tv);
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dump_tv_tag (n, tv);
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return rv;
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}
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/* Standard plugin API entry point. */
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enum ld_plugin_status
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onload (struct ld_plugin_tv *tv)
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{
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size_t n = 0;
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enum ld_plugin_status rv;
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/* This plugin does nothing but dump the tv array. It would
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be an error if this function was called without one. */
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if (!tv)
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return LDPS_ERR;
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/* First entry should always be LDPT_MESSAGE, letting us get
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hold of it easily so we can send output straight away. */
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if (tv[0].tv_tag == LDPT_MESSAGE)
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tv_message = tv[0].tv_u.tv_message;
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fflush (NULL);
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TV_MESSAGE (LDPL_INFO, "Hello from testplugin.");
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do
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if ((rv = parse_and_dump_tv_tag (n++, tv)) != LDPS_OK)
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return rv;
|
|
while ((tv++)->tv_tag != LDPT_NULL);
|
|
|
|
/* Register hooks only if instructed by options. */
|
|
if (register_claimfile_hook)
|
|
{
|
|
if (!tv_register_claim_file)
|
|
{
|
|
TV_MESSAGE (LDPL_FATAL, "No register_claim_file hook");
|
|
fflush (NULL);
|
|
return LDPS_ERR;
|
|
}
|
|
(*tv_register_claim_file) (onclaim_file);
|
|
}
|
|
if (register_allsymbolsread_hook)
|
|
{
|
|
if (!tv_register_all_symbols_read)
|
|
{
|
|
TV_MESSAGE (LDPL_FATAL, "No register_all_symbols_read hook");
|
|
fflush (NULL);
|
|
return LDPS_ERR;
|
|
}
|
|
(*tv_register_all_symbols_read) (onall_symbols_read);
|
|
}
|
|
if (register_cleanup_hook)
|
|
{
|
|
if (!tv_register_cleanup)
|
|
{
|
|
TV_MESSAGE (LDPL_FATAL, "No register_cleanup hook");
|
|
fflush (NULL);
|
|
return LDPS_ERR;
|
|
}
|
|
(*tv_register_cleanup) (oncleanup);
|
|
}
|
|
fflush (NULL);
|
|
return onload_ret;
|
|
}
|
|
|
|
/* Standard plugin API registerable hook. */
|
|
static enum ld_plugin_status
|
|
onclaim_file (const struct ld_plugin_input_file *file, int *claimed)
|
|
{
|
|
/* Let's see if we want to claim this file. */
|
|
claim_file_t *claimfile = claimfiles_list;
|
|
while (claimfile)
|
|
{
|
|
if (!strcmp (file->name, claimfile->file.name))
|
|
break;
|
|
claimfile = claimfile->next;
|
|
}
|
|
|
|
/* Inform the user/testsuite. */
|
|
TV_MESSAGE (LDPL_INFO, "hook called: claim_file %s [@%ld/%ld] %s",
|
|
file->name, (long)file->offset, (long)file->filesize,
|
|
claimfile ? "CLAIMED" : "not claimed");
|
|
fflush (NULL);
|
|
|
|
/* If we decided to claim it, record that fact, and add any symbols
|
|
that were defined for it by plugin options. */
|
|
*claimed = (claimfile != 0);
|
|
if (claimfile)
|
|
{
|
|
claimfile->claimed = TRUE;
|
|
claimfile->file = *file;
|
|
if (claimfile->n_syms_used && !tv_add_symbols)
|
|
return LDPS_ERR;
|
|
else if (claimfile->n_syms_used)
|
|
return (*tv_add_symbols) (claimfile->file.handle,
|
|
claimfile->n_syms_used, claimfile->symbols);
|
|
}
|
|
|
|
return claim_file_ret;
|
|
}
|
|
|
|
/* Standard plugin API registerable hook. */
|
|
static enum ld_plugin_status
|
|
onall_symbols_read (void)
|
|
{
|
|
static const char *resolutions[] =
|
|
{
|
|
"LDPR_UNKNOWN",
|
|
"LDPR_UNDEF",
|
|
"LDPR_PREVAILING_DEF",
|
|
"LDPR_PREVAILING_DEF_IRONLY",
|
|
"LDPR_PREEMPTED_REG",
|
|
"LDPR_PREEMPTED_IR",
|
|
"LDPR_RESOLVED_IR",
|
|
"LDPR_RESOLVED_EXEC",
|
|
"LDPR_RESOLVED_DYN",
|
|
"LDPR_PREVAILING_DEF_IRONLY_EXP",
|
|
};
|
|
claim_file_t *claimfile = dumpresolutions ? claimfiles_list : NULL;
|
|
add_file_t *addfile = addfiles_list;
|
|
TV_MESSAGE (LDPL_INFO, "hook called: all symbols read.");
|
|
for ( ; claimfile; claimfile = claimfile->next)
|
|
{
|
|
enum ld_plugin_status rv;
|
|
int n;
|
|
if (claimfile->n_syms_used && !tv_get_symbols_v2)
|
|
return LDPS_ERR;
|
|
else if (!claimfile->n_syms_used)
|
|
continue;
|
|
rv = tv_get_symbols_v2 (claimfile->file.handle, claimfile->n_syms_used,
|
|
claimfile->symbols);
|
|
if (rv != LDPS_OK)
|
|
return rv;
|
|
for (n = 0; n < claimfile->n_syms_used; n++)
|
|
TV_MESSAGE (LDPL_INFO, "Sym: '%s%s%s' Resolution: %s",
|
|
claimfile->symbols[n].name,
|
|
claimfile->symbols[n].version ? "@" : "",
|
|
(claimfile->symbols[n].version
|
|
? claimfile->symbols[n].version : ""),
|
|
resolutions[claimfile->symbols[n].resolution]);
|
|
}
|
|
for ( ; addfile ; addfile = addfile->next)
|
|
{
|
|
enum ld_plugin_status rv;
|
|
if (addfile->type == ADD_LIB && tv_add_input_library)
|
|
rv = (*tv_add_input_library) (addfile->name);
|
|
else if (addfile->type == ADD_FILE && tv_add_input_file)
|
|
rv = (*tv_add_input_file) (addfile->name);
|
|
else if (addfile->type == ADD_DIR && tv_set_extra_library_path)
|
|
rv = (*tv_set_extra_library_path) (addfile->name);
|
|
else
|
|
rv = LDPS_ERR;
|
|
if (rv != LDPS_OK)
|
|
return rv;
|
|
}
|
|
fflush (NULL);
|
|
return all_symbols_read_ret;
|
|
}
|
|
|
|
/* Standard plugin API registerable hook. */
|
|
static enum ld_plugin_status
|
|
oncleanup (void)
|
|
{
|
|
TV_MESSAGE (LDPL_INFO, "hook called: cleanup.");
|
|
fflush (NULL);
|
|
return cleanup_ret;
|
|
}
|