290 lines
6.9 KiB
C
290 lines
6.9 KiB
C
/* plugin-api.h -- External linker plugin API. */
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/* Copyright 2009 Free Software Foundation, Inc.
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Written by Cary Coutant <ccoutant@google.com>.
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This file is part of 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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/* This file defines the interface for writing a linker plugin, which is
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described at < http://gcc.gnu.org/wiki/whopr/driver >. */
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#ifndef PLUGIN_API_H
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#define PLUGIN_API_H
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#include <stdint.h>
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#include <sys/types.h>
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/* Status code returned by most API routines. */
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enum ld_plugin_status
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{
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LDPS_OK = 0,
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LDPS_NO_SYMS, /* Attempt to get symbols that haven't been added. */
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LDPS_BAD_HANDLE, /* No claimed object associated with given handle. */
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LDPS_ERR
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/* Additional Error codes TBD. */
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};
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/* The version of the API specification. */
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enum ld_plugin_api_version
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{
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LD_PLUGIN_API_VERSION = 1
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};
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/* The type of output file being generated by the linker. */
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enum ld_plugin_output_file_type
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{
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LDPO_REL,
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LDPO_EXEC,
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LDPO_DYN
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};
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/* An input file managed by the plugin library. */
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struct ld_plugin_input_file
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{
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const char *name;
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int fd;
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off_t offset;
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off_t filesize;
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void *handle;
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};
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/* A symbol belonging to an input file managed by the plugin library. */
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struct ld_plugin_symbol
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{
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char *name;
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char *version;
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int def;
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int visibility;
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uint64_t size;
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char *comdat_key;
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int resolution;
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};
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/* Whether the symbol is a definition, reference, or common, weak or not. */
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enum ld_plugin_symbol_kind
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{
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LDPK_DEF,
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LDPK_WEAKDEF,
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LDPK_UNDEF,
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LDPK_WEAKUNDEF,
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LDPK_COMMON
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};
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/* The visibility of the symbol. */
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enum ld_plugin_symbol_visibility
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{
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LDPV_DEFAULT,
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LDPV_PROTECTED,
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LDPV_INTERNAL,
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LDPV_HIDDEN
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};
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/* How a symbol is resolved. */
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enum ld_plugin_symbol_resolution
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{
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LDPR_UNKNOWN = 0,
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/* Symbol is still undefined at this point. */
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LDPR_UNDEF,
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/* This is the prevailing definition of the symbol, with references from
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regular object code. */
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LDPR_PREVAILING_DEF,
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/* This is the prevailing definition of the symbol, with no
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references from regular objects. It is only referenced from IR
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code. */
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LDPR_PREVAILING_DEF_IRONLY,
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/* This definition was pre-empted by a definition in a regular
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object file. */
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LDPR_PREEMPTED_REG,
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/* This definition was pre-empted by a definition in another IR file. */
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LDPR_PREEMPTED_IR,
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/* This symbol was resolved by a definition in another IR file. */
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LDPR_RESOLVED_IR,
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/* This symbol was resolved by a definition in a regular object
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linked into the main executable. */
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LDPR_RESOLVED_EXEC,
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/* This symbol was resolved by a definition in a shared object. */
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LDPR_RESOLVED_DYN
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};
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/* The plugin library's "claim file" handler. */
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typedef
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enum ld_plugin_status
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(*ld_plugin_claim_file_handler) (
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const struct ld_plugin_input_file *file, int *claimed);
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/* The plugin library's "all symbols read" handler. */
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typedef
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enum ld_plugin_status
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(*ld_plugin_all_symbols_read_handler) (void);
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/* The plugin library's cleanup handler. */
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typedef
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enum ld_plugin_status
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(*ld_plugin_cleanup_handler) (void);
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/* The linker's interface for registering the "claim file" handler. */
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typedef
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enum ld_plugin_status
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(*ld_plugin_register_claim_file) (ld_plugin_claim_file_handler handler);
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/* The linker's interface for registering the "all symbols read" handler. */
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typedef
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enum ld_plugin_status
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(*ld_plugin_register_all_symbols_read) (
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ld_plugin_all_symbols_read_handler handler);
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/* The linker's interface for registering the cleanup handler. */
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typedef
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enum ld_plugin_status
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(*ld_plugin_register_cleanup) (ld_plugin_cleanup_handler handler);
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/* The linker's interface for adding symbols from a claimed input file. */
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typedef
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enum ld_plugin_status
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(*ld_plugin_add_symbols) (void *handle, int nsyms,
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const struct ld_plugin_symbol *syms);
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/* The linker's interface for getting the input file information with
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an open (possibly re-opened) file descriptor. */
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typedef
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enum ld_plugin_status
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(*ld_plugin_get_input_file) (const void *handle,
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struct ld_plugin_input_file *file);
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/* The linker's interface for releasing the input file. */
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typedef
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enum ld_plugin_status
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(*ld_plugin_release_input_file) (const void *handle);
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/* The linker's interface for retrieving symbol resolution information. */
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typedef
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enum ld_plugin_status
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(*ld_plugin_get_symbols) (const void *handle, int nsyms,
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struct ld_plugin_symbol *syms);
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/* The linker's interface for adding a compiled input file. */
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typedef
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enum ld_plugin_status
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(*ld_plugin_add_input_file) (char *pathname);
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/* The linker's interface for adding a library that should be searched. */
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typedef
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enum ld_plugin_status
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(*ld_plugin_add_input_library) (char *libname);
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/* The linker's interface for issuing a warning or error message. */
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typedef
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enum ld_plugin_status
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(*ld_plugin_message) (int level, const char *format, ...);
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enum ld_plugin_level
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{
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LDPL_INFO,
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LDPL_WARNING,
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LDPL_ERROR,
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LDPL_FATAL
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};
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/* Values for the tv_tag field of the transfer vector. */
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enum ld_plugin_tag
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{
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LDPT_NULL = 0,
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LDPT_API_VERSION,
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LDPT_GOLD_VERSION,
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LDPT_LINKER_OUTPUT,
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LDPT_OPTION,
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LDPT_REGISTER_CLAIM_FILE_HOOK,
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LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK,
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LDPT_REGISTER_CLEANUP_HOOK,
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LDPT_ADD_SYMBOLS,
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LDPT_GET_SYMBOLS,
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LDPT_ADD_INPUT_FILE,
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LDPT_MESSAGE,
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LDPT_GET_INPUT_FILE,
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LDPT_RELEASE_INPUT_FILE,
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LDPT_ADD_INPUT_LIBRARY
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};
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/* The plugin transfer vector. */
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struct ld_plugin_tv
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{
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enum ld_plugin_tag tv_tag;
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union
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{
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int tv_val;
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const char *tv_string;
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ld_plugin_register_claim_file tv_register_claim_file;
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ld_plugin_register_all_symbols_read tv_register_all_symbols_read;
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ld_plugin_register_cleanup tv_register_cleanup;
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ld_plugin_add_symbols tv_add_symbols;
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ld_plugin_get_symbols tv_get_symbols;
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ld_plugin_add_input_file tv_add_input_file;
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ld_plugin_message tv_message;
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ld_plugin_get_input_file tv_get_input_file;
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ld_plugin_release_input_file tv_release_input_file;
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ld_plugin_add_input_library tv_add_input_library;
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} tv_u;
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};
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/* The plugin library's "onload" entry point. */
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typedef
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enum ld_plugin_status
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(*ld_plugin_onload) (struct ld_plugin_tv *tv);
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#ifdef __cplusplus
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}
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#endif
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#endif /* !defined(PLUGIN_API_H) */
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