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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [gold/] [testsuite/] [plugin_section_order.c] - Rev 190
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/* plugin_section_reorder.c -- Simple plugin to reorder function sections Copyright 2011 Free Software Foundation, Inc. Written by Sriraman Tallam <tmsriram@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. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include <stdio.h> #include <stdlib.h> #include <string.h> #include <assert.h> #include "plugin-api.h" static ld_plugin_get_input_section_count get_input_section_count = NULL; static ld_plugin_get_input_section_type get_input_section_type = NULL; static ld_plugin_get_input_section_name get_input_section_name = NULL; static ld_plugin_get_input_section_contents get_input_section_contents = NULL; static ld_plugin_update_section_order update_section_order = NULL; static ld_plugin_allow_section_ordering allow_section_ordering = NULL; 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); /* Plugin entry point. */ enum ld_plugin_status onload(struct ld_plugin_tv *tv) { struct ld_plugin_tv *entry; for (entry = tv; entry->tv_tag != LDPT_NULL; ++entry) { switch (entry->tv_tag) { case LDPT_REGISTER_CLAIM_FILE_HOOK: assert((*entry->tv_u.tv_register_claim_file) (claim_file_hook) == LDPS_OK); break; case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK: assert((*entry->tv_u.tv_register_all_symbols_read) (all_symbols_read_hook) == LDPS_OK); break; case LDPT_GET_INPUT_SECTION_COUNT: get_input_section_count = *entry->tv_u.tv_get_input_section_count; break; case LDPT_GET_INPUT_SECTION_TYPE: get_input_section_type = *entry->tv_u.tv_get_input_section_type; break; case LDPT_GET_INPUT_SECTION_NAME: get_input_section_name = *entry->tv_u.tv_get_input_section_name; break; case LDPT_GET_INPUT_SECTION_CONTENTS: get_input_section_contents = *entry->tv_u.tv_get_input_section_contents; break; case LDPT_UPDATE_SECTION_ORDER: update_section_order = *entry->tv_u.tv_update_section_order; break; case LDPT_ALLOW_SECTION_ORDERING: allow_section_ordering = *entry->tv_u.tv_allow_section_ordering; break; default: break; } } if (get_input_section_count == NULL || get_input_section_type == NULL || get_input_section_name == NULL || get_input_section_contents == NULL || update_section_order == NULL || allow_section_ordering == NULL) { fprintf(stderr, "Some interfaces are missing\n"); return LDPS_ERR; } return LDPS_OK; } inline static int is_prefix_of(const char *prefix, const char *str) { return strncmp(prefix, str, strlen (prefix)) == 0; } struct ld_plugin_section section_list[3]; int num_entries = 0; /* This function is called by the linker for every new object it encounters. */ enum ld_plugin_status claim_file_hook(const struct ld_plugin_input_file *file, int *claimed) { static int is_ordering_specified = 0; struct ld_plugin_section section; unsigned int count = 0; unsigned int shndx; *claimed = 0; if (is_ordering_specified == 0) { /* Inform the linker to prepare for section reordering. */ (*allow_section_ordering)(); is_ordering_specified = 1; } (*get_input_section_count)(file->handle, &count); for (shndx = 0; shndx < count; ++shndx) { char *name = NULL; int position = 3; section.handle = file->handle; section.shndx = shndx; (*get_input_section_name)(section, &name); /* Order is foo() followed by bar() followed by baz() */ if (is_prefix_of(".text.", name)) { if (strstr(name, "_Z3foov") != NULL) position = 0; else if (strstr(name, "_Z3barv") != NULL) position = 1; else if (strstr(name, "_Z3bazv") != NULL) position = 2; else position = 3; } if (position < 3) { section_list[position].handle = file->handle; section_list[position].shndx = shndx; num_entries++; } } return LDPS_OK; } /* This function is called by the linker after all the symbols have been read. At this stage, it is fine to tell the linker the desired function order. */ enum ld_plugin_status all_symbols_read_hook(void) { if (num_entries == 3) update_section_order(section_list, num_entries); return LDPS_OK; }
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