2012-03-26 19:18:29 +00:00
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// script.h -- handle linker scripts for gold -*- C++ -*-
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2021-03-21 00:09:18 +00:00
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// Copyright (C) 2006-2020 Free Software Foundation, Inc.
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2012-03-26 19:18:29 +00:00
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// Written by Ian Lance Taylor <iant@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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// We implement a subset of the original GNU ld linker script language
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// for compatibility. The goal is not to implement the entire
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// language. It is merely to implement enough to handle common uses.
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// In particular we need to handle /usr/lib/libc.so on a typical
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// GNU/Linux system, and we want to handle linker scripts used by the
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// Linux kernel build.
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#ifndef GOLD_SCRIPT_H
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#define GOLD_SCRIPT_H
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#include <cstdio>
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#include <string>
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#include <vector>
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2015-08-28 15:32:19 +00:00
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#include "elfcpp.h"
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2012-03-26 19:18:29 +00:00
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#include "script-sections.h"
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namespace gold
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{
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class General_options;
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class Command_line;
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class Symbol_table;
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class Layout;
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class Mapfile;
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class Input_argument;
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class Input_arguments;
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class Input_objects;
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class Input_group;
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class Input_file;
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class Output_segment;
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class Task_token;
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class Workqueue;
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struct Version_dependency_list;
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struct Version_expression_list;
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struct Version_tree;
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2014-09-12 22:14:23 +00:00
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struct Version_expression;
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class Lazy_demangler;
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class Incremental_script_entry;
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2012-03-26 19:18:29 +00:00
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// This class represents an expression in a linker script.
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class Expression
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{
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protected:
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// These should only be created by child classes.
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Expression()
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{ }
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public:
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virtual ~Expression()
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{ }
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// Return the value of the expression which is not permitted to
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// refer to the dot symbol. CHECK_ASSERTIONS is true if we should
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// check whether assertions are true.
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uint64_t
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eval(const Symbol_table*, const Layout*, bool check_assertions);
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// Return the value of an expression which is permitted to refer to
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// the dot symbol. DOT_VALUE is the absolute value of the dot
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// symbol. DOT_SECTION is the section in which dot is defined; it
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// should be NULL if the dot symbol has an absolute value (e.g., is
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// defined in a SECTIONS clause outside of any output section
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// definition). This sets *RESULT_SECTION to indicate where the
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// value is defined. If the value is absolute *RESULT_SECTION will
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// be NULL. Note that the returned value is still an absolute
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// value; to get a section relative value the caller must subtract
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2014-09-12 22:14:23 +00:00
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// the section address. If RESULT_ALIGNMENT is not NULL, this sets
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// *RESULT_ALIGNMENT to the alignment of the value of that alignment
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// is larger than *RESULT_ALIGNMENT; this will only be non-zero if
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// this is an ALIGN expression. If IS_SECTION_DOT_ASSIGMENT is true,
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// we are evaluating an assignment to dot within an output section,
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// and an absolute value should be interpreted as an offset within
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// the section.
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2012-03-26 19:18:29 +00:00
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uint64_t
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eval_with_dot(const Symbol_table*, const Layout*, bool check_assertions,
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uint64_t dot_value, Output_section* dot_section,
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2014-09-12 22:14:23 +00:00
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Output_section** result_section, uint64_t* result_alignment,
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bool is_section_dot_assignment);
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2012-03-26 19:18:29 +00:00
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// Return the value of an expression which may or may not be
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// permitted to refer to the dot symbol, depending on
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2014-09-12 22:14:23 +00:00
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// is_dot_available. If IS_SECTION_DOT_ASSIGMENT is true,
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// we are evaluating an assignment to dot within an output section,
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// and an absolute value should be interpreted as an offset within
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// the section.
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2012-03-26 19:18:29 +00:00
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uint64_t
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eval_maybe_dot(const Symbol_table*, const Layout*, bool check_assertions,
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bool is_dot_available, uint64_t dot_value,
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Output_section* dot_section,
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2014-09-12 22:14:23 +00:00
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Output_section** result_section, uint64_t* result_alignment,
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2015-08-28 15:32:19 +00:00
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elfcpp::STT* type, elfcpp::STV* vis, unsigned char* nonvis,
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2017-04-10 11:32:00 +00:00
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bool is_section_dot_assignment, bool* is_valid_pointer);
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2012-03-26 19:18:29 +00:00
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// Print the expression to the FILE. This is for debugging.
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virtual void
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print(FILE*) const = 0;
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protected:
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struct Expression_eval_info;
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public:
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// Compute the value of the expression (implemented by child class).
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// This is public rather than protected because it is called
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// directly by children of Expression on other Expression objects.
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virtual uint64_t
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value(const Expression_eval_info*) = 0;
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2018-12-28 15:25:28 +00:00
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// Sets all symbols used in expressions as seen in a real ELF object.
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virtual void
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set_expr_sym_in_real_elf(Symbol_table*) const
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{ return; }
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2012-03-26 19:18:29 +00:00
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private:
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// May not be copied.
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Expression(const Expression&);
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Expression& operator=(const Expression&);
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};
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// Version_script_info stores information parsed from the version
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// script, either provided by --version-script or as part of a linker
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// script. A single Version_script_info object per target is owned by
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// Script_options.
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class Version_script_info
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{
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public:
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2014-09-12 22:14:23 +00:00
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// The languages which can be specified in a versionn script.
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enum Language
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{
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LANGUAGE_C, // No demangling.
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LANGUAGE_CXX, // C++ demangling.
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LANGUAGE_JAVA, // Java demangling.
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LANGUAGE_COUNT
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};
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Version_script_info();
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2012-03-26 19:18:29 +00:00
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~Version_script_info();
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// Clear everything.
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void
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clear();
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2014-09-12 22:14:23 +00:00
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// Finalize the version control information.
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void
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finalize();
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// Return whether the information is finalized.
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bool
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is_finalized() const
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{ return this->is_finalized_; }
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2012-03-26 19:18:29 +00:00
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// Return whether any version were defined in the version script.
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bool
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empty() const
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{ return this->version_trees_.empty(); }
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// If there is a version associated with SYMBOL, return true, and
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2014-09-12 22:14:23 +00:00
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// set *VERSION to the version, and *IS_GLOBAL to whether the symbol
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// should be global. Otherwise, return false.
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2012-03-26 19:18:29 +00:00
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bool
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2014-09-12 22:14:23 +00:00
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get_symbol_version(const char* symbol, std::string* version,
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bool* is_global) const;
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2012-03-26 19:18:29 +00:00
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// Return whether this symbol matches the local: section of some
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// version.
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bool
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symbol_is_local(const char* symbol) const
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2014-09-12 22:14:23 +00:00
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{
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bool is_global;
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return (this->get_symbol_version(symbol, NULL, &is_global)
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&& !is_global);
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}
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2012-03-26 19:18:29 +00:00
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// Return the names of versions defined in the version script.
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std::vector<std::string>
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get_versions() const;
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// Return the list of dependencies for this version.
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std::vector<std::string>
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get_dependencies(const char* version) const;
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// The following functions should only be used by the bison helper
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// functions. They allocate new structs whose memory belongs to
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// Version_script_info. The bison functions copy the information
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// from the version script into these structs.
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struct Version_dependency_list*
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allocate_dependency_list();
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struct Version_expression_list*
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allocate_expression_list();
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struct Version_tree*
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allocate_version_tree();
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2014-09-12 22:14:23 +00:00
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// Build the lookup tables after all data have been read.
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void
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build_lookup_tables();
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// Give an error if there are any unmatched names in the version
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// script.
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void
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check_unmatched_names(const Symbol_table*) const;
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2012-03-26 19:18:29 +00:00
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// Print contents to the FILE. This is for debugging.
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void
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print(FILE*) const;
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private:
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void
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print_expression_list(FILE* f, const Version_expression_list*) const;
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2014-09-12 22:14:23 +00:00
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bool
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get_symbol_version_helper(const char* symbol,
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bool check_global,
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std::string* pversion) const;
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// Fast lookup information for a given language.
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// We map from exact match strings to Version_tree's. Historically
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// version scripts sometimes have the same symbol multiple times,
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// which is ambiguous. We warn about that case by storing the
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// second Version_tree we see.
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struct Version_tree_match
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{
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Version_tree_match(const Version_tree* r, bool ig,
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const Version_expression* e)
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: real(r), is_global(ig), expression(e), ambiguous(NULL)
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{ }
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// The Version_tree that we return.
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const Version_tree* real;
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// True if this is a global match for the REAL member, false if it
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// is a local match.
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bool is_global;
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// Point back to the Version_expression for which we created this
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// match.
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const Version_expression* expression;
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// If not NULL, another Version_tree that defines the symbol.
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const Version_tree* ambiguous;
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};
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// Map from an exact match string to a Version_tree.
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typedef Unordered_map<std::string, Version_tree_match> Exact;
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// Fast lookup information for a glob pattern.
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struct Glob
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{
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Glob()
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: expression(NULL), version(NULL), is_global(false)
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{ }
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Glob(const Version_expression* e, const Version_tree* v, bool ig)
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: expression(e), version(v), is_global(ig)
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{ }
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// A pointer to the version expression holding the pattern to
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// match and the language to use for demangling the symbol before
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// doing the match.
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const Version_expression* expression;
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// The Version_tree we use if this pattern matches.
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const Version_tree* version;
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// True if this is a global symbol.
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bool is_global;
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};
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typedef std::vector<Glob> Globs;
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2012-03-26 19:18:29 +00:00
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2014-09-12 22:14:23 +00:00
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bool
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unquote(std::string*) const;
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void
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add_exact_match(const std::string&, const Version_tree*, bool is_global,
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const Version_expression*, Exact*);
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void
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build_expression_list_lookup(const Version_expression_list*,
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const Version_tree*, bool);
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const char*
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get_name_to_match(const char*, int,
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Lazy_demangler*, Lazy_demangler*) const;
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// All the version dependencies we allocate.
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std::vector<Version_dependency_list*> dependency_lists_;
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// All the version expressions we allocate.
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std::vector<Version_expression_list*> expression_lists_;
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// The list of versions.
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std::vector<Version_tree*> version_trees_;
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// Exact matches for global symbols, by language.
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Exact* exact_[LANGUAGE_COUNT];
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// A vector of glob patterns mapping to Version_trees.
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Globs globs_;
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// The default version to use, if there is one. This is from a
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// pattern of "*".
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const Version_tree* default_version_;
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// True if the default version is global.
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bool default_is_global_;
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// Whether this has been finalized.
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bool is_finalized_;
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2012-03-26 19:18:29 +00:00
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};
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// This class manages assignments to symbols. These can appear in
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// three different locations in scripts: outside of a SECTIONS clause,
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// within a SECTIONS clause, and within an output section definition
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// within a SECTIONS clause. This can also appear on the command line
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// via the --defsym command line option.
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class Symbol_assignment
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{
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public:
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2014-09-12 22:14:23 +00:00
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Symbol_assignment(const char* name, size_t namelen, bool is_defsym,
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Expression* val, bool provide, bool hidden)
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: name_(name, namelen), val_(val), is_defsym_(is_defsym),
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provide_(provide), hidden_(hidden), sym_(NULL)
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2012-03-26 19:18:29 +00:00
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{ }
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// Add the symbol to the symbol table.
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void
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add_to_table(Symbol_table*);
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// Finalize the symbol value.
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void
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finalize(Symbol_table*, const Layout*);
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2018-12-28 15:25:28 +00:00
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bool
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is_defsym() const
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{ return is_defsym_; }
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Expression *
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value() const
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{ return val_; }
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2012-03-26 19:18:29 +00:00
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// Finalize the symbol value when it can refer to the dot symbol.
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void
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finalize_with_dot(Symbol_table*, const Layout*, uint64_t dot_value,
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Output_section* dot_section);
|
|
|
|
|
2014-09-12 22:14:23 +00:00
|
|
|
// Set the symbol value, but only if the value is absolute or relative to
|
|
|
|
// DOT_SECTION. This is used while processing a SECTIONS clause.
|
|
|
|
// We assume that dot is an absolute value here. We do not check assertions.
|
2012-03-26 19:18:29 +00:00
|
|
|
void
|
|
|
|
set_if_absolute(Symbol_table*, const Layout*, bool is_dot_available,
|
2014-09-12 22:14:23 +00:00
|
|
|
uint64_t dot_value, Output_section* dot_section);
|
|
|
|
|
|
|
|
const std::string&
|
|
|
|
name() const
|
|
|
|
{ return this->name_; }
|
2012-03-26 19:18:29 +00:00
|
|
|
|
|
|
|
// Print the assignment to the FILE. This is for debugging.
|
|
|
|
void
|
|
|
|
print(FILE*) const;
|
|
|
|
|
|
|
|
private:
|
|
|
|
// Shared by finalize and finalize_with_dot.
|
|
|
|
void
|
|
|
|
finalize_maybe_dot(Symbol_table*, const Layout*, bool is_dot_available,
|
|
|
|
uint64_t dot_value, Output_section* dot_section);
|
|
|
|
|
|
|
|
// Sized version of finalize.
|
|
|
|
template<int size>
|
|
|
|
void
|
|
|
|
sized_finalize(Symbol_table*, const Layout*, bool is_dot_available,
|
|
|
|
uint64_t dot_value, Output_section*);
|
|
|
|
|
|
|
|
// Symbol name.
|
|
|
|
std::string name_;
|
|
|
|
// Expression to assign to symbol.
|
|
|
|
Expression* val_;
|
2014-09-12 22:14:23 +00:00
|
|
|
// True if this symbol is defined by a --defsym, false if it is
|
|
|
|
// defined in a linker script.
|
|
|
|
bool is_defsym_;
|
2012-03-26 19:18:29 +00:00
|
|
|
// Whether the assignment should be provided (only set if there is
|
|
|
|
// an undefined reference to the symbol.
|
|
|
|
bool provide_;
|
|
|
|
// Whether the assignment should be hidden.
|
|
|
|
bool hidden_;
|
|
|
|
// The entry in the symbol table.
|
|
|
|
Symbol* sym_;
|
|
|
|
};
|
|
|
|
|
|
|
|
// This class manages assertions in linker scripts. These can appear
|
|
|
|
// in all the places where a Symbol_assignment can appear.
|
|
|
|
|
|
|
|
class Script_assertion
|
|
|
|
{
|
|
|
|
public:
|
|
|
|
Script_assertion(Expression* check, const char* message,
|
|
|
|
size_t messagelen)
|
|
|
|
: check_(check), message_(message, messagelen)
|
|
|
|
{ }
|
|
|
|
|
|
|
|
// Check the assertion.
|
|
|
|
void
|
|
|
|
check(const Symbol_table*, const Layout*);
|
|
|
|
|
|
|
|
// Print the assertion to the FILE. This is for debugging.
|
|
|
|
void
|
|
|
|
print(FILE*) const;
|
|
|
|
|
|
|
|
private:
|
|
|
|
// The expression to check.
|
|
|
|
Expression* check_;
|
|
|
|
// The message to issue if the expression fails.
|
|
|
|
std::string message_;
|
|
|
|
};
|
|
|
|
|
|
|
|
// We can read a linker script in two different contexts: when
|
|
|
|
// initially parsing the command line, and when we find an input file
|
|
|
|
// which is actually a linker script. Also some of the data which can
|
|
|
|
// be set by a linker script can also be set via command line options
|
|
|
|
// like -e and --defsym. This means that we have a type of data which
|
|
|
|
// can be set both during command line option parsing and while
|
|
|
|
// reading input files. We store that data in an instance of this
|
|
|
|
// object. We will keep pointers to that instance in both the
|
|
|
|
// Command_line and Layout objects.
|
|
|
|
|
|
|
|
class Script_options
|
|
|
|
{
|
|
|
|
public:
|
|
|
|
Script_options();
|
|
|
|
|
|
|
|
// Add a symbol to be defined.
|
|
|
|
void
|
2014-09-12 22:14:23 +00:00
|
|
|
add_symbol_assignment(const char* name, size_t length, bool is_defsym,
|
|
|
|
Expression* value, bool provide, bool hidden);
|
|
|
|
|
|
|
|
// Look for an assigned symbol.
|
|
|
|
bool
|
|
|
|
is_pending_assignment(const char* name);
|
|
|
|
|
|
|
|
// Add a reference to a symbol.
|
|
|
|
void
|
|
|
|
add_symbol_reference(const char* name, size_t length);
|
2012-03-26 19:18:29 +00:00
|
|
|
|
|
|
|
// Add an assertion.
|
|
|
|
void
|
|
|
|
add_assertion(Expression* check, const char* message, size_t messagelen);
|
|
|
|
|
|
|
|
// Define a symbol from the command line.
|
|
|
|
bool
|
|
|
|
define_symbol(const char* definition);
|
|
|
|
|
2018-12-28 15:25:28 +00:00
|
|
|
// Populates the set with symbol names used in LHS of defsym.
|
|
|
|
void
|
|
|
|
find_defsym_defs(Unordered_set<std::string>&);
|
|
|
|
|
|
|
|
// Set symbols used in defsym expressions as seen in a real ELF object.
|
|
|
|
void set_defsym_uses_in_real_elf(Symbol_table*) const;
|
|
|
|
|
2012-03-26 19:18:29 +00:00
|
|
|
// Create sections required by any linker scripts.
|
|
|
|
void
|
|
|
|
create_script_sections(Layout*);
|
|
|
|
|
|
|
|
// Add all symbol definitions to the symbol table.
|
|
|
|
void
|
|
|
|
add_symbols_to_table(Symbol_table*);
|
|
|
|
|
2014-09-12 22:14:23 +00:00
|
|
|
// Used to iterate over symbols which are referenced in expressions
|
|
|
|
// but not defined.
|
|
|
|
typedef Unordered_set<std::string>::const_iterator referenced_const_iterator;
|
|
|
|
|
|
|
|
referenced_const_iterator
|
|
|
|
referenced_begin() const
|
|
|
|
{ return this->symbol_references_.begin(); }
|
|
|
|
|
|
|
|
referenced_const_iterator
|
|
|
|
referenced_end() const
|
|
|
|
{ return this->symbol_references_.end(); }
|
|
|
|
|
|
|
|
// Return whether a symbol is referenced but not defined.
|
|
|
|
bool
|
|
|
|
is_referenced(const std::string& name) const
|
|
|
|
{
|
|
|
|
return (this->symbol_references_.find(name)
|
|
|
|
!= this->symbol_references_.end());
|
|
|
|
}
|
|
|
|
|
|
|
|
// Return whether there are any symbols which were referenced but
|
|
|
|
// not defined.
|
|
|
|
bool
|
|
|
|
any_unreferenced() const
|
|
|
|
{ return !this->symbol_references_.empty(); }
|
|
|
|
|
2012-03-26 19:18:29 +00:00
|
|
|
// Finalize the symbol values. Also check assertions.
|
|
|
|
void
|
|
|
|
finalize_symbols(Symbol_table*, const Layout*);
|
|
|
|
|
|
|
|
// Version information parsed from a version script. Everything
|
|
|
|
// else has a pointer to this object.
|
|
|
|
Version_script_info*
|
|
|
|
version_script_info()
|
|
|
|
{ return &this->version_script_info_; }
|
|
|
|
|
|
|
|
const Version_script_info*
|
|
|
|
version_script_info() const
|
|
|
|
{ return &this->version_script_info_; }
|
|
|
|
|
|
|
|
// A SECTIONS clause parsed from a linker script. Everything else
|
|
|
|
// has a pointer to this object.
|
|
|
|
Script_sections*
|
|
|
|
script_sections()
|
|
|
|
{ return &this->script_sections_; }
|
|
|
|
|
|
|
|
const Script_sections*
|
|
|
|
script_sections() const
|
|
|
|
{ return &this->script_sections_; }
|
|
|
|
|
|
|
|
// Whether we saw a SECTIONS clause.
|
|
|
|
bool
|
|
|
|
saw_sections_clause() const
|
|
|
|
{ return this->script_sections_.saw_sections_clause(); }
|
|
|
|
|
|
|
|
// Whether we saw a PHDRS clause.
|
|
|
|
bool
|
|
|
|
saw_phdrs_clause() const
|
|
|
|
{ return this->script_sections_.saw_phdrs_clause(); }
|
|
|
|
|
|
|
|
// Set section addresses using a SECTIONS clause. Return the
|
|
|
|
// segment which should hold the file header and segment headers;
|
|
|
|
// this may return NULL, in which case the headers are not in a
|
|
|
|
// loadable segment.
|
|
|
|
Output_segment*
|
|
|
|
set_section_addresses(Symbol_table*, Layout*);
|
|
|
|
|
|
|
|
// Print the script to the FILE. This is for debugging.
|
|
|
|
void
|
|
|
|
print(FILE*) const;
|
|
|
|
|
|
|
|
private:
|
|
|
|
// We keep a list of symbol assignments which occur outside of a
|
|
|
|
// SECTIONS clause.
|
|
|
|
typedef std::vector<Symbol_assignment*> Symbol_assignments;
|
|
|
|
|
2017-04-10 11:32:00 +00:00
|
|
|
// We keep a list of all assertions which occur outside of a
|
2012-03-26 19:18:29 +00:00
|
|
|
// SECTIONS clause.
|
|
|
|
typedef std::vector<Script_assertion*> Assertions;
|
|
|
|
|
|
|
|
// The entry address. This will be empty if not set.
|
|
|
|
std::string entry_;
|
|
|
|
// Symbols to set.
|
|
|
|
Symbol_assignments symbol_assignments_;
|
2014-09-12 22:14:23 +00:00
|
|
|
// Symbols defined in an expression, for faster lookup.
|
|
|
|
Unordered_set<std::string> symbol_definitions_;
|
|
|
|
// Symbols referenced in an expression.
|
|
|
|
Unordered_set<std::string> symbol_references_;
|
2012-03-26 19:18:29 +00:00
|
|
|
// Assertions to check.
|
|
|
|
Assertions assertions_;
|
|
|
|
// Version information parsed from a version script.
|
|
|
|
Version_script_info version_script_info_;
|
|
|
|
// Information from any SECTIONS clauses.
|
|
|
|
Script_sections script_sections_;
|
|
|
|
};
|
|
|
|
|
|
|
|
// FILE was found as an argument on the command line, but was not
|
|
|
|
// recognized as an ELF file. Try to read it as a script. Return
|
|
|
|
// true if the file was handled. This has to handle /usr/lib/libc.so
|
|
|
|
// on a GNU/Linux system. *USED_NEXT_BLOCKER is set to indicate
|
|
|
|
// whether the function took over NEXT_BLOCKER.
|
|
|
|
|
|
|
|
bool
|
|
|
|
read_input_script(Workqueue*, Symbol_table*, Layout*, Dirsearch*, int,
|
|
|
|
Input_objects*, Mapfile*, Input_group*,
|
|
|
|
const Input_argument*, Input_file*,
|
|
|
|
Task_token* next_blocker, bool* used_next_blocker);
|
|
|
|
|
|
|
|
// FILE was found as an argument to --script (-T).
|
|
|
|
// Read it as a script, and execute its contents immediately.
|
|
|
|
|
|
|
|
bool
|
|
|
|
read_commandline_script(const char* filename, Command_line* cmdline);
|
|
|
|
|
|
|
|
// FILE was found as an argument to --version-script. Read it as a
|
|
|
|
// version script, and store its contents in
|
|
|
|
// cmdline->script_options()->version_script_info().
|
|
|
|
|
|
|
|
bool
|
|
|
|
read_version_script(const char* filename, Command_line* cmdline);
|
|
|
|
|
|
|
|
// FILENAME was found as an argument to --dynamic-list. Read it as a
|
|
|
|
// version script (actually, a versym_node from a version script), and
|
|
|
|
// store its contents in DYNAMIC_LIST.
|
|
|
|
|
|
|
|
bool
|
|
|
|
read_dynamic_list(const char* filename, Command_line* cmdline,
|
|
|
|
Script_options* dynamic_list);
|
|
|
|
|
|
|
|
} // End namespace gold.
|
|
|
|
|
|
|
|
#endif // !defined(GOLD_SCRIPT_H)
|