1441 lines
37 KiB
C++
1441 lines
37 KiB
C++
// plugin.cc -- plugin manager for gold -*- C++ -*-
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// Copyright 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
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// Written by Cary Coutant <ccoutant@google.com>.
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// This file is part of gold.
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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 "gold.h"
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#include <cstdio>
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#include <cstdarg>
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#include <cstring>
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#include <string>
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#include <vector>
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#ifdef ENABLE_PLUGINS
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#include <dlfcn.h>
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#endif
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#include "parameters.h"
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#include "errors.h"
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#include "fileread.h"
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#include "layout.h"
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#include "options.h"
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#include "plugin.h"
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#include "target.h"
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#include "readsyms.h"
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#include "symtab.h"
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#include "elfcpp.h"
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namespace gold
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{
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#ifdef ENABLE_PLUGINS
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// The linker's exported interfaces.
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extern "C"
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{
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static enum ld_plugin_status
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register_claim_file(ld_plugin_claim_file_handler handler);
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static enum ld_plugin_status
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register_all_symbols_read(ld_plugin_all_symbols_read_handler handler);
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static enum ld_plugin_status
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register_cleanup(ld_plugin_cleanup_handler handler);
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static enum ld_plugin_status
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add_symbols(void *handle, int nsyms, const struct ld_plugin_symbol *syms);
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static enum ld_plugin_status
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get_input_file(const void *handle, struct ld_plugin_input_file *file);
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static enum ld_plugin_status
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get_view(const void *handle, const void **viewp);
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static enum ld_plugin_status
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release_input_file(const void *handle);
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static enum ld_plugin_status
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get_symbols(const void *handle, int nsyms, struct ld_plugin_symbol *syms);
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static enum ld_plugin_status
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add_input_file(const char *pathname);
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static enum ld_plugin_status
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add_input_library(const char *pathname);
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static enum ld_plugin_status
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set_extra_library_path(const char *path);
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static enum ld_plugin_status
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message(int level, const char *format, ...);
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};
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#endif // ENABLE_PLUGINS
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static Pluginobj* make_sized_plugin_object(Input_file* input_file,
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off_t offset, off_t filesize);
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// Plugin methods.
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// Load one plugin library.
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void
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Plugin::load()
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{
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#ifdef ENABLE_PLUGINS
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// Load the plugin library.
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// FIXME: Look for the library in standard locations.
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this->handle_ = dlopen(this->filename_.c_str(), RTLD_NOW);
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if (this->handle_ == NULL)
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{
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gold_error(_("%s: could not load plugin library: %s"),
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this->filename_.c_str(), dlerror());
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return;
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}
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// Find the plugin's onload entry point.
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void* ptr = dlsym(this->handle_, "onload");
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if (ptr == NULL)
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{
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gold_error(_("%s: could not find onload entry point"),
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this->filename_.c_str());
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return;
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}
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ld_plugin_onload onload;
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gold_assert(sizeof(onload) == sizeof(ptr));
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memcpy(&onload, &ptr, sizeof(ptr));
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// Get the linker's version number.
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const char* ver = get_version_string();
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int major = 0;
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int minor = 0;
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sscanf(ver, "%d.%d", &major, &minor);
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// Allocate and populate a transfer vector.
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const int tv_fixed_size = 17;
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int tv_size = this->args_.size() + tv_fixed_size;
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ld_plugin_tv* tv = new ld_plugin_tv[tv_size];
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// Put LDPT_MESSAGE at the front of the list so the plugin can use it
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// while processing subsequent entries.
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int i = 0;
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tv[i].tv_tag = LDPT_MESSAGE;
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tv[i].tv_u.tv_message = message;
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++i;
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tv[i].tv_tag = LDPT_API_VERSION;
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tv[i].tv_u.tv_val = LD_PLUGIN_API_VERSION;
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++i;
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tv[i].tv_tag = LDPT_GOLD_VERSION;
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tv[i].tv_u.tv_val = major * 100 + minor;
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++i;
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tv[i].tv_tag = LDPT_LINKER_OUTPUT;
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if (parameters->options().relocatable())
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tv[i].tv_u.tv_val = LDPO_REL;
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else if (parameters->options().shared())
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tv[i].tv_u.tv_val = LDPO_DYN;
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else
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tv[i].tv_u.tv_val = LDPO_EXEC;
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++i;
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tv[i].tv_tag = LDPT_OUTPUT_NAME;
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tv[i].tv_u.tv_string = parameters->options().output();
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for (unsigned int j = 0; j < this->args_.size(); ++j)
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{
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++i;
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tv[i].tv_tag = LDPT_OPTION;
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tv[i].tv_u.tv_string = this->args_[j].c_str();
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}
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++i;
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tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK;
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tv[i].tv_u.tv_register_claim_file = register_claim_file;
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++i;
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tv[i].tv_tag = LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK;
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tv[i].tv_u.tv_register_all_symbols_read = register_all_symbols_read;
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++i;
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tv[i].tv_tag = LDPT_REGISTER_CLEANUP_HOOK;
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tv[i].tv_u.tv_register_cleanup = register_cleanup;
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++i;
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tv[i].tv_tag = LDPT_ADD_SYMBOLS;
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tv[i].tv_u.tv_add_symbols = add_symbols;
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++i;
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tv[i].tv_tag = LDPT_GET_INPUT_FILE;
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tv[i].tv_u.tv_get_input_file = get_input_file;
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++i;
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tv[i].tv_tag = LDPT_GET_VIEW;
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tv[i].tv_u.tv_get_view = get_view;
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++i;
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tv[i].tv_tag = LDPT_RELEASE_INPUT_FILE;
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tv[i].tv_u.tv_release_input_file = release_input_file;
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++i;
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tv[i].tv_tag = LDPT_GET_SYMBOLS;
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tv[i].tv_u.tv_get_symbols = get_symbols;
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++i;
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tv[i].tv_tag = LDPT_ADD_INPUT_FILE;
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tv[i].tv_u.tv_add_input_file = add_input_file;
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++i;
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tv[i].tv_tag = LDPT_ADD_INPUT_LIBRARY;
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tv[i].tv_u.tv_add_input_library = add_input_library;
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++i;
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tv[i].tv_tag = LDPT_SET_EXTRA_LIBRARY_PATH;
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tv[i].tv_u.tv_set_extra_library_path = set_extra_library_path;
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++i;
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tv[i].tv_tag = LDPT_NULL;
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tv[i].tv_u.tv_val = 0;
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gold_assert(i == tv_size - 1);
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// Call the onload entry point.
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(*onload)(tv);
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delete[] tv;
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#endif // ENABLE_PLUGINS
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}
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// Call the plugin claim-file handler.
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inline bool
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Plugin::claim_file(struct ld_plugin_input_file* plugin_input_file)
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{
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int claimed = 0;
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if (this->claim_file_handler_ != NULL)
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{
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(*this->claim_file_handler_)(plugin_input_file, &claimed);
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if (claimed)
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return true;
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}
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return false;
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}
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// Call the all-symbols-read handler.
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inline void
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Plugin::all_symbols_read()
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{
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if (this->all_symbols_read_handler_ != NULL)
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(*this->all_symbols_read_handler_)();
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}
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// Call the cleanup handler.
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inline void
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Plugin::cleanup()
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{
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if (this->cleanup_handler_ != NULL && !this->cleanup_done_)
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{
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// Set this flag before calling to prevent a recursive plunge
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// in the event that a plugin's cleanup handler issues a
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// fatal error.
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this->cleanup_done_ = true;
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(*this->cleanup_handler_)();
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}
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}
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// This task is used to rescan archives as needed.
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class Plugin_rescan : public Task
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{
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public:
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Plugin_rescan(Task_token* this_blocker, Task_token* next_blocker)
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: this_blocker_(this_blocker), next_blocker_(next_blocker)
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{ }
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~Plugin_rescan()
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{
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delete this->this_blocker_;
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}
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Task_token*
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is_runnable()
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{
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if (this->this_blocker_->is_blocked())
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return this->this_blocker_;
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return NULL;
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}
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void
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locks(Task_locker* tl)
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{ tl->add(this, this->next_blocker_); }
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void
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run(Workqueue*)
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{ parameters->options().plugins()->rescan(this); }
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std::string
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get_name() const
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{ return "Plugin_rescan"; }
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private:
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Task_token* this_blocker_;
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Task_token* next_blocker_;
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};
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// Plugin_manager methods.
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Plugin_manager::~Plugin_manager()
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{
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for (Plugin_list::iterator p = this->plugins_.begin();
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p != this->plugins_.end();
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++p)
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delete *p;
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this->plugins_.clear();
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for (Object_list::iterator obj = this->objects_.begin();
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obj != this->objects_.end();
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++obj)
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delete *obj;
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this->objects_.clear();
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}
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// Load all plugin libraries.
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void
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Plugin_manager::load_plugins()
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{
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for (this->current_ = this->plugins_.begin();
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this->current_ != this->plugins_.end();
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++this->current_)
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(*this->current_)->load();
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}
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// Call the plugin claim-file handlers in turn to see if any claim the file.
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Pluginobj*
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Plugin_manager::claim_file(Input_file* input_file, off_t offset,
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off_t filesize)
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{
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if (this->in_replacement_phase_)
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return NULL;
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unsigned int handle = this->objects_.size();
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this->input_file_ = input_file;
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this->plugin_input_file_.name = input_file->filename().c_str();
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this->plugin_input_file_.fd = input_file->file().descriptor();
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this->plugin_input_file_.offset = offset;
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this->plugin_input_file_.filesize = filesize;
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this->plugin_input_file_.handle = reinterpret_cast<void*>(handle);
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for (this->current_ = this->plugins_.begin();
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this->current_ != this->plugins_.end();
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++this->current_)
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{
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if ((*this->current_)->claim_file(&this->plugin_input_file_))
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{
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this->any_claimed_ = true;
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if (this->objects_.size() > handle)
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return this->objects_[handle];
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// If the plugin claimed the file but did not call the
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// add_symbols callback, we need to create the Pluginobj now.
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Pluginobj* obj = this->make_plugin_object(handle);
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return obj;
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}
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}
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return NULL;
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}
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// Save an archive. This is used so that a plugin can add a file
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// which refers to a symbol which was not previously referenced. In
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// that case we want to pretend that the symbol was referenced before,
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// and pull in the archive object.
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void
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Plugin_manager::save_archive(Archive* archive)
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{
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if (this->in_replacement_phase_ || !this->any_claimed_)
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delete archive;
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else
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this->rescannable_.push_back(Rescannable(archive));
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}
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// Save an Input_group. This is like save_archive.
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void
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Plugin_manager::save_input_group(Input_group* input_group)
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{
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if (this->in_replacement_phase_ || !this->any_claimed_)
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delete input_group;
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else
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this->rescannable_.push_back(Rescannable(input_group));
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}
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// Call the all-symbols-read handlers.
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void
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Plugin_manager::all_symbols_read(Workqueue* workqueue, Task* task,
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Input_objects* input_objects,
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Symbol_table* symtab, Layout* layout,
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Dirsearch* dirpath, Mapfile* mapfile,
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Task_token** last_blocker)
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{
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this->in_replacement_phase_ = true;
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this->workqueue_ = workqueue;
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this->task_ = task;
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this->input_objects_ = input_objects;
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this->symtab_ = symtab;
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this->layout_ = layout;
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this->dirpath_ = dirpath;
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this->mapfile_ = mapfile;
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this->this_blocker_ = NULL;
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for (this->current_ = this->plugins_.begin();
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this->current_ != this->plugins_.end();
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++this->current_)
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(*this->current_)->all_symbols_read();
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if (this->any_added_)
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{
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Task_token* next_blocker = new Task_token(true);
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next_blocker->add_blocker();
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workqueue->queue(new Plugin_rescan(this->this_blocker_, next_blocker));
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this->this_blocker_ = next_blocker;
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}
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*last_blocker = this->this_blocker_;
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}
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// This is called when we see a new undefined symbol. If we are in
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// the replacement phase, this means that we may need to rescan some
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// archives we have previously seen.
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void
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Plugin_manager::new_undefined_symbol(Symbol* sym)
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{
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if (this->in_replacement_phase_)
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this->undefined_symbols_.push_back(sym);
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}
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// Rescan archives as needed. This handles the case where a new
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// object file added by a plugin has an undefined reference to some
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// symbol defined in an archive.
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void
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Plugin_manager::rescan(Task* task)
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{
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size_t rescan_pos = 0;
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size_t rescan_size = this->rescannable_.size();
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while (!this->undefined_symbols_.empty())
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{
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if (rescan_pos >= rescan_size)
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{
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this->undefined_symbols_.clear();
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return;
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}
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Undefined_symbol_list undefs;
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undefs.reserve(this->undefined_symbols_.size());
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this->undefined_symbols_.swap(undefs);
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size_t min_rescan_pos = rescan_size;
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for (Undefined_symbol_list::const_iterator p = undefs.begin();
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p != undefs.end();
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++p)
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{
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if (!(*p)->is_undefined())
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continue;
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this->undefined_symbols_.push_back(*p);
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// Find the first rescan archive which defines this symbol,
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// starting at the current rescan position. The rescan position
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// exists so that given -la -lb -lc we don't look for undefined
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// symbols in -lb back in -la, but instead get the definition
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// from -lc. Don't bother to look past the current minimum
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// rescan position.
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for (size_t i = rescan_pos; i < min_rescan_pos; ++i)
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{
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if (this->rescannable_defines(i, *p))
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{
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min_rescan_pos = i;
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break;
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}
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}
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}
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if (min_rescan_pos >= rescan_size)
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{
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// We didn't find any rescannable archives which define any
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// undefined symbols.
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return;
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}
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const Rescannable& r(this->rescannable_[min_rescan_pos]);
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if (r.is_archive)
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{
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Task_lock_obj<Archive> tl(task, r.u.archive);
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r.u.archive->add_symbols(this->symtab_, this->layout_,
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this->input_objects_, this->mapfile_);
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}
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else
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{
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size_t next_saw_undefined = this->symtab_->saw_undefined();
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size_t saw_undefined;
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do
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{
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saw_undefined = next_saw_undefined;
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for (Input_group::const_iterator p = r.u.input_group->begin();
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p != r.u.input_group->end();
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++p)
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{
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Task_lock_obj<Archive> tl(task, *p);
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(*p)->add_symbols(this->symtab_, this->layout_,
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this->input_objects_, this->mapfile_);
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}
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next_saw_undefined = this->symtab_->saw_undefined();
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}
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while (saw_undefined != next_saw_undefined);
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}
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for (size_t i = rescan_pos; i < min_rescan_pos + 1; ++i)
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{
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if (this->rescannable_[i].is_archive)
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delete this->rescannable_[i].u.archive;
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else
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delete this->rescannable_[i].u.input_group;
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}
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rescan_pos = min_rescan_pos + 1;
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}
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}
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// Return whether the rescannable at index I defines SYM.
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bool
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Plugin_manager::rescannable_defines(size_t i, Symbol* sym)
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{
|
|
const Rescannable& r(this->rescannable_[i]);
|
|
if (r.is_archive)
|
|
return r.u.archive->defines_symbol(sym);
|
|
else
|
|
{
|
|
for (Input_group::const_iterator p = r.u.input_group->begin();
|
|
p != r.u.input_group->end();
|
|
++p)
|
|
{
|
|
if ((*p)->defines_symbol(sym))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// Layout deferred objects.
|
|
|
|
void
|
|
Plugin_manager::layout_deferred_objects()
|
|
{
|
|
Deferred_layout_list::iterator obj;
|
|
|
|
for (obj = this->deferred_layout_objects_.begin();
|
|
obj != this->deferred_layout_objects_.end();
|
|
++obj)
|
|
{
|
|
// Lock the object so we can read from it. This is only called
|
|
// single-threaded from queue_middle_tasks, so it is OK to lock.
|
|
// Unfortunately we have no way to pass in a Task token.
|
|
const Task* dummy_task = reinterpret_cast<const Task*>(-1);
|
|
Task_lock_obj<Object> tl(dummy_task, *obj);
|
|
(*obj)->layout_deferred_sections(this->layout_);
|
|
}
|
|
}
|
|
|
|
// Call the cleanup handlers.
|
|
|
|
void
|
|
Plugin_manager::cleanup()
|
|
{
|
|
for (this->current_ = this->plugins_.begin();
|
|
this->current_ != this->plugins_.end();
|
|
++this->current_)
|
|
(*this->current_)->cleanup();
|
|
}
|
|
|
|
// Make a new Pluginobj object. This is called when the plugin calls
|
|
// the add_symbols API.
|
|
|
|
Pluginobj*
|
|
Plugin_manager::make_plugin_object(unsigned int handle)
|
|
{
|
|
// Make sure we aren't asked to make an object for the same handle twice.
|
|
if (this->objects_.size() != handle)
|
|
return NULL;
|
|
|
|
Pluginobj* obj = make_sized_plugin_object(this->input_file_,
|
|
this->plugin_input_file_.offset,
|
|
this->plugin_input_file_.filesize);
|
|
this->objects_.push_back(obj);
|
|
return obj;
|
|
}
|
|
|
|
// Get the input file information with an open (possibly re-opened)
|
|
// file descriptor.
|
|
|
|
ld_plugin_status
|
|
Plugin_manager::get_input_file(unsigned int handle,
|
|
struct ld_plugin_input_file* file)
|
|
{
|
|
Pluginobj* obj = this->object(handle);
|
|
if (obj == NULL)
|
|
return LDPS_BAD_HANDLE;
|
|
|
|
obj->lock(this->task_);
|
|
file->name = obj->filename().c_str();
|
|
file->fd = obj->descriptor();
|
|
file->offset = obj->offset();
|
|
file->filesize = obj->filesize();
|
|
file->handle = reinterpret_cast<void*>(handle);
|
|
return LDPS_OK;
|
|
}
|
|
|
|
// Release the input file.
|
|
|
|
ld_plugin_status
|
|
Plugin_manager::release_input_file(unsigned int handle)
|
|
{
|
|
Pluginobj* obj = this->object(handle);
|
|
if (obj == NULL)
|
|
return LDPS_BAD_HANDLE;
|
|
|
|
obj->unlock(this->task_);
|
|
return LDPS_OK;
|
|
}
|
|
|
|
ld_plugin_status
|
|
Plugin_manager::get_view(unsigned int handle, const void **viewp)
|
|
{
|
|
off_t offset;
|
|
size_t filesize;
|
|
Input_file *input_file;
|
|
if (this->objects_.size() == handle)
|
|
{
|
|
// We are being called from the claim_file hook.
|
|
const struct ld_plugin_input_file &f = this->plugin_input_file_;
|
|
offset = f.offset;
|
|
filesize = f.filesize;
|
|
input_file = this->input_file_;
|
|
}
|
|
else
|
|
{
|
|
// An already claimed file.
|
|
Pluginobj* obj = this->object(handle);
|
|
if (obj == NULL)
|
|
return LDPS_BAD_HANDLE;
|
|
offset = obj->offset();
|
|
filesize = obj->filesize();
|
|
input_file = obj->input_file();
|
|
}
|
|
*viewp = (void*) input_file->file().get_view(offset, 0, filesize, false,
|
|
false);
|
|
return LDPS_OK;
|
|
}
|
|
|
|
// Add a new library path.
|
|
|
|
ld_plugin_status
|
|
Plugin_manager::set_extra_library_path(const char* path)
|
|
{
|
|
this->extra_search_path_ = std::string(path);
|
|
return LDPS_OK;
|
|
}
|
|
|
|
// Add a new input file.
|
|
|
|
ld_plugin_status
|
|
Plugin_manager::add_input_file(const char* pathname, bool is_lib)
|
|
{
|
|
Input_file_argument file(pathname,
|
|
(is_lib
|
|
? Input_file_argument::INPUT_FILE_TYPE_LIBRARY
|
|
: Input_file_argument::INPUT_FILE_TYPE_FILE),
|
|
(is_lib
|
|
? this->extra_search_path_.c_str()
|
|
: ""),
|
|
false,
|
|
this->options_);
|
|
Input_argument* input_argument = new Input_argument(file);
|
|
Task_token* next_blocker = new Task_token(true);
|
|
next_blocker->add_blocker();
|
|
if (parameters->incremental())
|
|
gold_error(_("input files added by plug-ins in --incremental mode not "
|
|
"supported yet"));
|
|
this->workqueue_->queue_soon(new Read_symbols(this->input_objects_,
|
|
this->symtab_,
|
|
this->layout_,
|
|
this->dirpath_,
|
|
0,
|
|
this->mapfile_,
|
|
input_argument,
|
|
NULL,
|
|
NULL,
|
|
this->this_blocker_,
|
|
next_blocker));
|
|
this->this_blocker_ = next_blocker;
|
|
this->any_added_ = true;
|
|
return LDPS_OK;
|
|
}
|
|
|
|
// Class Pluginobj.
|
|
|
|
Pluginobj::Pluginobj(const std::string& name, Input_file* input_file,
|
|
off_t offset, off_t filesize)
|
|
: Object(name, input_file, false, offset),
|
|
nsyms_(0), syms_(NULL), symbols_(), filesize_(filesize), comdat_map_()
|
|
{
|
|
}
|
|
|
|
// Return TRUE if a defined symbol might be reachable from outside the
|
|
// universe of claimed objects.
|
|
|
|
static inline bool
|
|
is_visible_from_outside(Symbol* lsym)
|
|
{
|
|
if (lsym->in_real_elf())
|
|
return true;
|
|
if (parameters->options().relocatable())
|
|
return true;
|
|
if (parameters->options().is_undefined(lsym->name()))
|
|
return true;
|
|
if (parameters->options().export_dynamic() || parameters->options().shared())
|
|
return lsym->is_externally_visible();
|
|
return false;
|
|
}
|
|
|
|
// Get symbol resolution info.
|
|
|
|
ld_plugin_status
|
|
Pluginobj::get_symbol_resolution_info(int nsyms, ld_plugin_symbol* syms) const
|
|
{
|
|
if (nsyms > this->nsyms_)
|
|
return LDPS_NO_SYMS;
|
|
|
|
if (static_cast<size_t>(nsyms) > this->symbols_.size())
|
|
{
|
|
// We never decided to include this object. We mark all symbols as
|
|
// preempted.
|
|
gold_assert(this->symbols_.size() == 0);
|
|
for (int i = 0; i < nsyms; i++)
|
|
syms[i].resolution = LDPR_PREEMPTED_REG;
|
|
return LDPS_OK;
|
|
}
|
|
|
|
for (int i = 0; i < nsyms; i++)
|
|
{
|
|
ld_plugin_symbol* isym = &syms[i];
|
|
Symbol* lsym = this->symbols_[i];
|
|
ld_plugin_symbol_resolution res = LDPR_UNKNOWN;
|
|
|
|
if (lsym->is_undefined())
|
|
// The symbol remains undefined.
|
|
res = LDPR_UNDEF;
|
|
else if (isym->def == LDPK_UNDEF
|
|
|| isym->def == LDPK_WEAKUNDEF
|
|
|| isym->def == LDPK_COMMON)
|
|
{
|
|
// The original symbol was undefined or common.
|
|
if (lsym->source() != Symbol::FROM_OBJECT)
|
|
res = LDPR_RESOLVED_EXEC;
|
|
else if (lsym->object()->pluginobj() == this)
|
|
res = (is_visible_from_outside(lsym)
|
|
? LDPR_PREVAILING_DEF
|
|
: LDPR_PREVAILING_DEF_IRONLY);
|
|
else if (lsym->object()->pluginobj() != NULL)
|
|
res = LDPR_RESOLVED_IR;
|
|
else if (lsym->object()->is_dynamic())
|
|
res = LDPR_RESOLVED_DYN;
|
|
else
|
|
res = LDPR_RESOLVED_EXEC;
|
|
}
|
|
else
|
|
{
|
|
// The original symbol was a definition.
|
|
if (lsym->source() != Symbol::FROM_OBJECT)
|
|
res = LDPR_PREEMPTED_REG;
|
|
else if (lsym->object() == static_cast<const Object*>(this))
|
|
res = (is_visible_from_outside(lsym)
|
|
? LDPR_PREVAILING_DEF
|
|
: LDPR_PREVAILING_DEF_IRONLY);
|
|
else
|
|
res = (lsym->object()->pluginobj() != NULL
|
|
? LDPR_PREEMPTED_IR
|
|
: LDPR_PREEMPTED_REG);
|
|
}
|
|
isym->resolution = res;
|
|
}
|
|
return LDPS_OK;
|
|
}
|
|
|
|
// Return TRUE if the comdat group with key COMDAT_KEY from this object
|
|
// should be kept.
|
|
|
|
bool
|
|
Pluginobj::include_comdat_group(std::string comdat_key, Layout* layout)
|
|
{
|
|
std::pair<Comdat_map::iterator, bool> ins =
|
|
this->comdat_map_.insert(std::make_pair(comdat_key, false));
|
|
|
|
// If this is the first time we've seen this comdat key, ask the
|
|
// layout object whether it should be included.
|
|
if (ins.second)
|
|
ins.first->second = layout->find_or_add_kept_section(comdat_key,
|
|
NULL, 0, true,
|
|
true, NULL);
|
|
|
|
return ins.first->second;
|
|
}
|
|
|
|
// Class Sized_pluginobj.
|
|
|
|
template<int size, bool big_endian>
|
|
Sized_pluginobj<size, big_endian>::Sized_pluginobj(
|
|
const std::string& name,
|
|
Input_file* input_file,
|
|
off_t offset,
|
|
off_t filesize)
|
|
: Pluginobj(name, input_file, offset, filesize)
|
|
{
|
|
}
|
|
|
|
// Read the symbols. Not used for plugin objects.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Sized_pluginobj<size, big_endian>::do_read_symbols(Read_symbols_data*)
|
|
{
|
|
gold_unreachable();
|
|
}
|
|
|
|
// Lay out the input sections. Not used for plugin objects.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Sized_pluginobj<size, big_endian>::do_layout(Symbol_table*, Layout*,
|
|
Read_symbols_data*)
|
|
{
|
|
gold_unreachable();
|
|
}
|
|
|
|
// Add the symbols to the symbol table.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Sized_pluginobj<size, big_endian>::do_add_symbols(Symbol_table* symtab,
|
|
Read_symbols_data*,
|
|
Layout* layout)
|
|
{
|
|
const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
|
|
unsigned char symbuf[sym_size];
|
|
elfcpp::Sym<size, big_endian> sym(symbuf);
|
|
elfcpp::Sym_write<size, big_endian> osym(symbuf);
|
|
|
|
typedef typename elfcpp::Elf_types<size>::Elf_WXword Elf_size_type;
|
|
|
|
this->symbols_.resize(this->nsyms_);
|
|
|
|
for (int i = 0; i < this->nsyms_; ++i)
|
|
{
|
|
const struct ld_plugin_symbol* isym = &this->syms_[i];
|
|
const char* name = isym->name;
|
|
const char* ver = isym->version;
|
|
elfcpp::Elf_Half shndx;
|
|
elfcpp::STB bind;
|
|
elfcpp::STV vis;
|
|
|
|
if (name != NULL && name[0] == '\0')
|
|
name = NULL;
|
|
if (ver != NULL && ver[0] == '\0')
|
|
ver = NULL;
|
|
|
|
switch (isym->def)
|
|
{
|
|
case LDPK_WEAKDEF:
|
|
case LDPK_WEAKUNDEF:
|
|
bind = elfcpp::STB_WEAK;
|
|
break;
|
|
case LDPK_DEF:
|
|
case LDPK_UNDEF:
|
|
case LDPK_COMMON:
|
|
default:
|
|
bind = elfcpp::STB_GLOBAL;
|
|
break;
|
|
}
|
|
|
|
switch (isym->def)
|
|
{
|
|
case LDPK_DEF:
|
|
case LDPK_WEAKDEF:
|
|
shndx = elfcpp::SHN_ABS;
|
|
break;
|
|
case LDPK_COMMON:
|
|
shndx = elfcpp::SHN_COMMON;
|
|
break;
|
|
case LDPK_UNDEF:
|
|
case LDPK_WEAKUNDEF:
|
|
default:
|
|
shndx = elfcpp::SHN_UNDEF;
|
|
break;
|
|
}
|
|
|
|
switch (isym->visibility)
|
|
{
|
|
case LDPV_PROTECTED:
|
|
vis = elfcpp::STV_PROTECTED;
|
|
break;
|
|
case LDPV_INTERNAL:
|
|
vis = elfcpp::STV_INTERNAL;
|
|
break;
|
|
case LDPV_HIDDEN:
|
|
vis = elfcpp::STV_HIDDEN;
|
|
break;
|
|
case LDPV_DEFAULT:
|
|
default:
|
|
vis = elfcpp::STV_DEFAULT;
|
|
break;
|
|
}
|
|
|
|
if (isym->comdat_key != NULL
|
|
&& isym->comdat_key[0] != '\0'
|
|
&& !this->include_comdat_group(isym->comdat_key, layout))
|
|
shndx = elfcpp::SHN_UNDEF;
|
|
|
|
osym.put_st_name(0);
|
|
osym.put_st_value(0);
|
|
osym.put_st_size(static_cast<Elf_size_type>(isym->size));
|
|
osym.put_st_info(bind, elfcpp::STT_NOTYPE);
|
|
osym.put_st_other(vis, 0);
|
|
osym.put_st_shndx(shndx);
|
|
|
|
this->symbols_[i] =
|
|
symtab->add_from_pluginobj<size, big_endian>(this, name, ver, &sym);
|
|
}
|
|
}
|
|
|
|
template<int size, bool big_endian>
|
|
Archive::Should_include
|
|
Sized_pluginobj<size, big_endian>::do_should_include_member(
|
|
Symbol_table* symtab,
|
|
Layout* layout,
|
|
Read_symbols_data*,
|
|
std::string* why)
|
|
{
|
|
char* tmpbuf = NULL;
|
|
size_t tmpbuflen = 0;
|
|
|
|
for (int i = 0; i < this->nsyms_; ++i)
|
|
{
|
|
const struct ld_plugin_symbol& sym = this->syms_[i];
|
|
const char* name = sym.name;
|
|
Symbol* symbol;
|
|
Archive::Should_include t = Archive::should_include_member(symtab,
|
|
layout,
|
|
name,
|
|
&symbol, why,
|
|
&tmpbuf,
|
|
&tmpbuflen);
|
|
if (t == Archive::SHOULD_INCLUDE_YES)
|
|
{
|
|
if (tmpbuf != NULL)
|
|
free(tmpbuf);
|
|
return t;
|
|
}
|
|
}
|
|
if (tmpbuf != NULL)
|
|
free(tmpbuf);
|
|
return Archive::SHOULD_INCLUDE_UNKNOWN;
|
|
}
|
|
|
|
// Iterate over global symbols, calling a visitor class V for each.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Sized_pluginobj<size, big_endian>::do_for_all_global_symbols(
|
|
Read_symbols_data*,
|
|
Library_base::Symbol_visitor_base* v)
|
|
{
|
|
for (int i = 0; i < this->nsyms_; ++i)
|
|
{
|
|
const struct ld_plugin_symbol& sym = this->syms_[i];
|
|
if (sym.def != LDPK_UNDEF)
|
|
v->visit(sym.name);
|
|
}
|
|
}
|
|
|
|
// Get the size of a section. Not used for plugin objects.
|
|
|
|
template<int size, bool big_endian>
|
|
uint64_t
|
|
Sized_pluginobj<size, big_endian>::do_section_size(unsigned int)
|
|
{
|
|
gold_unreachable();
|
|
return 0;
|
|
}
|
|
|
|
// Get the name of a section. Not used for plugin objects.
|
|
|
|
template<int size, bool big_endian>
|
|
std::string
|
|
Sized_pluginobj<size, big_endian>::do_section_name(unsigned int)
|
|
{
|
|
gold_unreachable();
|
|
return std::string();
|
|
}
|
|
|
|
// Return a view of the contents of a section. Not used for plugin objects.
|
|
|
|
template<int size, bool big_endian>
|
|
Object::Location
|
|
Sized_pluginobj<size, big_endian>::do_section_contents(unsigned int)
|
|
{
|
|
Location loc(0, 0);
|
|
|
|
gold_unreachable();
|
|
return loc;
|
|
}
|
|
|
|
// Return section flags. Not used for plugin objects.
|
|
|
|
template<int size, bool big_endian>
|
|
uint64_t
|
|
Sized_pluginobj<size, big_endian>::do_section_flags(unsigned int)
|
|
{
|
|
gold_unreachable();
|
|
return 0;
|
|
}
|
|
|
|
// Return section entsize. Not used for plugin objects.
|
|
|
|
template<int size, bool big_endian>
|
|
uint64_t
|
|
Sized_pluginobj<size, big_endian>::do_section_entsize(unsigned int)
|
|
{
|
|
gold_unreachable();
|
|
return 0;
|
|
}
|
|
|
|
// Return section address. Not used for plugin objects.
|
|
|
|
template<int size, bool big_endian>
|
|
uint64_t
|
|
Sized_pluginobj<size, big_endian>::do_section_address(unsigned int)
|
|
{
|
|
gold_unreachable();
|
|
return 0;
|
|
}
|
|
|
|
// Return section type. Not used for plugin objects.
|
|
|
|
template<int size, bool big_endian>
|
|
unsigned int
|
|
Sized_pluginobj<size, big_endian>::do_section_type(unsigned int)
|
|
{
|
|
gold_unreachable();
|
|
return 0;
|
|
}
|
|
|
|
// Return the section link field. Not used for plugin objects.
|
|
|
|
template<int size, bool big_endian>
|
|
unsigned int
|
|
Sized_pluginobj<size, big_endian>::do_section_link(unsigned int)
|
|
{
|
|
gold_unreachable();
|
|
return 0;
|
|
}
|
|
|
|
// Return the section link field. Not used for plugin objects.
|
|
|
|
template<int size, bool big_endian>
|
|
unsigned int
|
|
Sized_pluginobj<size, big_endian>::do_section_info(unsigned int)
|
|
{
|
|
gold_unreachable();
|
|
return 0;
|
|
}
|
|
|
|
// Return the section alignment. Not used for plugin objects.
|
|
|
|
template<int size, bool big_endian>
|
|
uint64_t
|
|
Sized_pluginobj<size, big_endian>::do_section_addralign(unsigned int)
|
|
{
|
|
gold_unreachable();
|
|
return 0;
|
|
}
|
|
|
|
// Return the Xindex structure to use. Not used for plugin objects.
|
|
|
|
template<int size, bool big_endian>
|
|
Xindex*
|
|
Sized_pluginobj<size, big_endian>::do_initialize_xindex()
|
|
{
|
|
gold_unreachable();
|
|
return NULL;
|
|
}
|
|
|
|
// Get symbol counts. Not used for plugin objects.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Sized_pluginobj<size, big_endian>::do_get_global_symbol_counts(const Symbol_table*,
|
|
size_t*, size_t*) const
|
|
{
|
|
gold_unreachable();
|
|
}
|
|
|
|
// Get symbols. Not used for plugin objects.
|
|
|
|
template<int size, bool big_endian>
|
|
const Object::Symbols*
|
|
Sized_pluginobj<size, big_endian>::do_get_global_symbols() const
|
|
{
|
|
gold_unreachable();
|
|
}
|
|
|
|
// Class Plugin_finish. This task runs after all replacement files have
|
|
// been added. For now, it's a placeholder for a possible plugin API
|
|
// to allow the plugin to release most of its resources. The cleanup
|
|
// handlers must be called later, because they can remove the temporary
|
|
// object files that are needed until the end of the link.
|
|
|
|
class Plugin_finish : public Task
|
|
{
|
|
public:
|
|
Plugin_finish(Task_token* this_blocker, Task_token* next_blocker)
|
|
: this_blocker_(this_blocker), next_blocker_(next_blocker)
|
|
{ }
|
|
|
|
~Plugin_finish()
|
|
{
|
|
if (this->this_blocker_ != NULL)
|
|
delete this->this_blocker_;
|
|
}
|
|
|
|
Task_token*
|
|
is_runnable()
|
|
{
|
|
if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
|
|
return this->this_blocker_;
|
|
return NULL;
|
|
}
|
|
|
|
void
|
|
locks(Task_locker* tl)
|
|
{ tl->add(this, this->next_blocker_); }
|
|
|
|
void
|
|
run(Workqueue*)
|
|
{
|
|
// We could call early cleanup handlers here.
|
|
}
|
|
|
|
std::string
|
|
get_name() const
|
|
{ return "Plugin_finish"; }
|
|
|
|
private:
|
|
Task_token* this_blocker_;
|
|
Task_token* next_blocker_;
|
|
};
|
|
|
|
// Class Plugin_hook.
|
|
|
|
Plugin_hook::~Plugin_hook()
|
|
{
|
|
}
|
|
|
|
// Return whether a Plugin_hook task is runnable.
|
|
|
|
Task_token*
|
|
Plugin_hook::is_runnable()
|
|
{
|
|
if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
|
|
return this->this_blocker_;
|
|
return NULL;
|
|
}
|
|
|
|
// Return a Task_locker for a Plugin_hook task. We don't need any
|
|
// locks here.
|
|
|
|
void
|
|
Plugin_hook::locks(Task_locker*)
|
|
{
|
|
}
|
|
|
|
// Run the "all symbols read" plugin hook.
|
|
|
|
void
|
|
Plugin_hook::run(Workqueue* workqueue)
|
|
{
|
|
gold_assert(this->options_.has_plugins());
|
|
Symbol* start_sym;
|
|
if (parameters->options().entry())
|
|
start_sym = this->symtab_->lookup(parameters->options().entry());
|
|
else
|
|
start_sym = this->symtab_->lookup("_start");
|
|
if (start_sym != NULL)
|
|
start_sym->set_in_real_elf();
|
|
|
|
this->options_.plugins()->all_symbols_read(workqueue,
|
|
this,
|
|
this->input_objects_,
|
|
this->symtab_,
|
|
this->layout_,
|
|
this->dirpath_,
|
|
this->mapfile_,
|
|
&this->this_blocker_);
|
|
workqueue->queue_soon(new Plugin_finish(this->this_blocker_,
|
|
this->next_blocker_));
|
|
}
|
|
|
|
// The C interface routines called by the plugins.
|
|
|
|
#ifdef ENABLE_PLUGINS
|
|
|
|
// Register a claim-file handler.
|
|
|
|
static enum ld_plugin_status
|
|
register_claim_file(ld_plugin_claim_file_handler handler)
|
|
{
|
|
gold_assert(parameters->options().has_plugins());
|
|
parameters->options().plugins()->set_claim_file_handler(handler);
|
|
return LDPS_OK;
|
|
}
|
|
|
|
// Register an all-symbols-read handler.
|
|
|
|
static enum ld_plugin_status
|
|
register_all_symbols_read(ld_plugin_all_symbols_read_handler handler)
|
|
{
|
|
gold_assert(parameters->options().has_plugins());
|
|
parameters->options().plugins()->set_all_symbols_read_handler(handler);
|
|
return LDPS_OK;
|
|
}
|
|
|
|
// Register a cleanup handler.
|
|
|
|
static enum ld_plugin_status
|
|
register_cleanup(ld_plugin_cleanup_handler handler)
|
|
{
|
|
gold_assert(parameters->options().has_plugins());
|
|
parameters->options().plugins()->set_cleanup_handler(handler);
|
|
return LDPS_OK;
|
|
}
|
|
|
|
// Add symbols from a plugin-claimed input file.
|
|
|
|
static enum ld_plugin_status
|
|
add_symbols(void* handle, int nsyms, const ld_plugin_symbol* syms)
|
|
{
|
|
gold_assert(parameters->options().has_plugins());
|
|
Pluginobj* obj = parameters->options().plugins()->make_plugin_object(
|
|
static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
|
|
if (obj == NULL)
|
|
return LDPS_ERR;
|
|
obj->store_incoming_symbols(nsyms, syms);
|
|
return LDPS_OK;
|
|
}
|
|
|
|
// Get the input file information with an open (possibly re-opened)
|
|
// file descriptor.
|
|
|
|
static enum ld_plugin_status
|
|
get_input_file(const void* handle, struct ld_plugin_input_file* file)
|
|
{
|
|
gold_assert(parameters->options().has_plugins());
|
|
unsigned int obj_index =
|
|
static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
|
|
return parameters->options().plugins()->get_input_file(obj_index, file);
|
|
}
|
|
|
|
// Release the input file.
|
|
|
|
static enum ld_plugin_status
|
|
release_input_file(const void* handle)
|
|
{
|
|
gold_assert(parameters->options().has_plugins());
|
|
unsigned int obj_index =
|
|
static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
|
|
return parameters->options().plugins()->release_input_file(obj_index);
|
|
}
|
|
|
|
static enum ld_plugin_status
|
|
get_view(const void *handle, const void **viewp)
|
|
{
|
|
gold_assert(parameters->options().has_plugins());
|
|
unsigned int obj_index =
|
|
static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
|
|
return parameters->options().plugins()->get_view(obj_index, viewp);
|
|
}
|
|
|
|
// Get the symbol resolution info for a plugin-claimed input file.
|
|
|
|
static enum ld_plugin_status
|
|
get_symbols(const void* handle, int nsyms, ld_plugin_symbol* syms)
|
|
{
|
|
gold_assert(parameters->options().has_plugins());
|
|
Pluginobj* obj = parameters->options().plugins()->object(
|
|
static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
|
|
if (obj == NULL)
|
|
return LDPS_ERR;
|
|
return obj->get_symbol_resolution_info(nsyms, syms);
|
|
}
|
|
|
|
// Add a new (real) input file generated by a plugin.
|
|
|
|
static enum ld_plugin_status
|
|
add_input_file(const char* pathname)
|
|
{
|
|
gold_assert(parameters->options().has_plugins());
|
|
return parameters->options().plugins()->add_input_file(pathname, false);
|
|
}
|
|
|
|
// Add a new (real) library required by a plugin.
|
|
|
|
static enum ld_plugin_status
|
|
add_input_library(const char* pathname)
|
|
{
|
|
gold_assert(parameters->options().has_plugins());
|
|
return parameters->options().plugins()->add_input_file(pathname, true);
|
|
}
|
|
|
|
// Set the extra library path to be used by libraries added via
|
|
// add_input_library
|
|
|
|
static enum ld_plugin_status
|
|
set_extra_library_path(const char* path)
|
|
{
|
|
gold_assert(parameters->options().has_plugins());
|
|
return parameters->options().plugins()->set_extra_library_path(path);
|
|
}
|
|
|
|
// Issue a diagnostic message from a plugin.
|
|
|
|
static enum ld_plugin_status
|
|
message(int level, const char* format, ...)
|
|
{
|
|
va_list args;
|
|
va_start(args, format);
|
|
|
|
switch (level)
|
|
{
|
|
case LDPL_INFO:
|
|
parameters->errors()->info(format, args);
|
|
break;
|
|
case LDPL_WARNING:
|
|
parameters->errors()->warning(format, args);
|
|
break;
|
|
case LDPL_ERROR:
|
|
default:
|
|
parameters->errors()->error(format, args);
|
|
break;
|
|
case LDPL_FATAL:
|
|
parameters->errors()->fatal(format, args);
|
|
break;
|
|
}
|
|
|
|
va_end(args);
|
|
return LDPS_OK;
|
|
}
|
|
|
|
#endif // ENABLE_PLUGINS
|
|
|
|
// Allocate a Pluginobj object of the appropriate size and endianness.
|
|
|
|
static Pluginobj*
|
|
make_sized_plugin_object(Input_file* input_file, off_t offset, off_t filesize)
|
|
{
|
|
Pluginobj* obj = NULL;
|
|
|
|
parameters_force_valid_target();
|
|
const Target& target(parameters->target());
|
|
|
|
if (target.get_size() == 32)
|
|
{
|
|
if (target.is_big_endian())
|
|
#ifdef HAVE_TARGET_32_BIG
|
|
obj = new Sized_pluginobj<32, true>(input_file->filename(),
|
|
input_file, offset, filesize);
|
|
#else
|
|
gold_error(_("%s: not configured to support "
|
|
"32-bit big-endian object"),
|
|
input_file->filename().c_str());
|
|
#endif
|
|
else
|
|
#ifdef HAVE_TARGET_32_LITTLE
|
|
obj = new Sized_pluginobj<32, false>(input_file->filename(),
|
|
input_file, offset, filesize);
|
|
#else
|
|
gold_error(_("%s: not configured to support "
|
|
"32-bit little-endian object"),
|
|
input_file->filename().c_str());
|
|
#endif
|
|
}
|
|
else if (target.get_size() == 64)
|
|
{
|
|
if (target.is_big_endian())
|
|
#ifdef HAVE_TARGET_64_BIG
|
|
obj = new Sized_pluginobj<64, true>(input_file->filename(),
|
|
input_file, offset, filesize);
|
|
#else
|
|
gold_error(_("%s: not configured to support "
|
|
"64-bit big-endian object"),
|
|
input_file->filename().c_str());
|
|
#endif
|
|
else
|
|
#ifdef HAVE_TARGET_64_LITTLE
|
|
obj = new Sized_pluginobj<64, false>(input_file->filename(),
|
|
input_file, offset, filesize);
|
|
#else
|
|
gold_error(_("%s: not configured to support "
|
|
"64-bit little-endian object"),
|
|
input_file->filename().c_str());
|
|
#endif
|
|
}
|
|
|
|
gold_assert(obj != NULL);
|
|
return obj;
|
|
}
|
|
|
|
} // End namespace gold.
|