--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/include/plugin-api.h	Fri Feb 12 23:39:51 2010 +0900
@@ -0,0 +1,298 @@
+/* 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
+
+#ifdef HAVE_STDINT_H
+#include <stdint.h>
+#elif defined(HAVE_INTTYPES_H)
+#include <inttypes.h>
+#endif
+#include <sys/types.h>
+#if !defined(HAVE_STDINT_H) && !defined(HAVE_INTTYPES_H) && \
+    !defined(UINT64_MAX) && !defined(uint64_t)
+#error can not find uint64_t type
+#endif
+
+#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) */