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// script-sections.h -- linker script SECTIONS for gold -*- C++ -*-
// Copyright 2008 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
// MA 02110-1301, USA.
// This is for the support of the SECTIONS clause in linker scripts.
#ifndef GOLD_SCRIPT_SECTIONS_H
#define GOLD_SCRIPT_SECTIONS_H
#include <cstdio>
#include <vector>
namespace gold
{
struct Parser_output_section_header;
struct Parser_output_section_trailer;
struct Input_section_spec;
class Expression;
class Sections_element;
class Output_section_definition;
class Output_section;
class Output_segment;
class Script_sections
{
public:
Script_sections();
// Start a SECTIONS clause.
void
start_sections();
// Finish a SECTIONS clause.
void
finish_sections();
// Return whether we ever saw a SECTIONS clause. If we did, then
// all section layout needs to go through this class.
bool
saw_sections_clause() const
{ return this->saw_sections_clause_; }
// Return whether we are currently processing a SECTIONS clause.
bool
in_sections_clause() const
{ return this->in_sections_clause_; }
// Start processing entries for an output section.
void
start_output_section(const char* name, size_t namelen,
const Parser_output_section_header*);
// Finish processing entries for an output section.
void
finish_output_section(const Parser_output_section_trailer*);
// Add a data item to the current output section.
void
add_data(int size, bool is_signed, Expression* val);
// Add a symbol to be defined.
void
add_symbol_assignment(const char* name, size_t length, Expression* value,
bool provide, bool hidden);
// Add an assignment to the special dot symbol.
void
add_dot_assignment(Expression* value);
// Add an assertion.
void
add_assertion(Expression* check, const char* message, size_t messagelen);
// Add a setting for the fill value.
void
add_fill(Expression* val);
// Add an input section specification.
void
add_input_section(const Input_section_spec* spec, bool keep);
// Add any symbols we are defining to the symbol table.
void
add_symbols_to_table(Symbol_table*);
// Finalize symbol values and check assertions.
void
finalize_symbols(Symbol_table* symtab, const Layout* layout);
// Find the name of the output section to use for an input file name
// and section name. This returns a name, and sets
// *OUTPUT_SECTION_SLOT to point to the address where the actual
// output section may be stored.
// 1) If the input section should be discarded, this returns NULL
// and sets *OUTPUT_SECTION_SLOT to NULL.
// 2) If the input section is mapped by the SECTIONS clause, this
// returns the name to use for the output section (in permanent
// storage), and sets *OUTPUT_SECTION_SLOT to point to where the
// output section should be stored. **OUTPUT_SECTION_SLOT will be
// non-NULL if we have seen this output section already.
// 3) If the input section is not mapped by the SECTIONS clause,
// this returns SECTION_NAME, and sets *OUTPUT_SECTION_SLOT to
// NULL.
const char*
output_section_name(const char* file_name, const char* section_name,
Output_section*** output_section_slot);
// Place a marker for an orphan output section into the SECTIONS
// clause.
void
place_orphan(Output_section* os);
// Set the addresses of all the output sections. Return the segment
// which holds the file header and segment headers, if any.
Output_segment*
set_section_addresses(Symbol_table*, Layout*);
// Return the number of segments we expect to create based on the
// SECTIONS clause.
size_t
expected_segment_count(const Layout*) const;
// Print the contents to the FILE. This is for debugging.
void
print(FILE*) const;
private:
typedef std::vector<Sections_element*> Sections_elements;
// Create segments.
Output_segment*
create_segments(Layout*);
// Create PT_NOTE and PT_TLS segments.
void
create_note_and_tls_segments(Layout*, const std::vector<Output_section*>*);
// Return whether the section is a BSS section.
static bool
is_bss_section(const Output_section*);
// True if we ever saw a SECTIONS clause.
bool saw_sections_clause_;
// True if we are currently processing a SECTIONS clause.
bool in_sections_clause_;
// The list of elements in the SECTIONS clause.
Sections_elements* sections_elements_;
// The current output section, if there is one.
Output_section_definition* output_section_;
};
} // End namespace gold.
#endif // !defined(GOLD_SCRIPT_SECTIONS_H
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