// layout.h -- lay out output file sections for gold -*- C++ -*-
-// Copyright 2006, 2007 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#include <utility>
#include <vector>
+#include "script.h"
#include "workqueue.h"
#include "object.h"
#include "dynobj.h"
// Run the operation.
void
- run(Workqueue*);
+ run(Workqueue*, const Task*);
private:
Layout_task_runner(const Layout_task_runner&);
class Layout
{
public:
- Layout(const General_options& options);
+ Layout(const General_options& options, Script_options*);
// Given an input section SHNDX, named NAME, with data in SHDR, from
// the object file OBJECT, return the output section where this
const char* name, const elfcpp::Shdr<size, big_endian>& shdr,
unsigned int reloc_shndx, unsigned int reloc_type, off_t* offset);
+ // Layout an input reloc section when doing a relocatable link. The
+ // section is RELOC_SHNDX in OBJECT, with data in SHDR.
+ // DATA_SECTION is the reloc section to which it refers. RR is the
+ // relocatable information.
+ template<int size, bool big_endian>
+ Output_section*
+ layout_reloc(Sized_relobj<size, big_endian>* object,
+ unsigned int reloc_shndx,
+ const elfcpp::Shdr<size, big_endian>& shdr,
+ Output_section* data_section,
+ Relocatable_relocs* rr);
+
+ // Layout a group section when doing a relocatable link.
+ template<int size, bool big_endian>
+ void
+ layout_group(Symbol_table* symtab,
+ Sized_relobj<size, big_endian>* object,
+ unsigned int group_shndx,
+ const char* group_section_name,
+ const char* signature,
+ const elfcpp::Shdr<size, big_endian>& shdr,
+ const elfcpp::Elf_Word* contents);
+
// Like layout, only for exception frame sections. OBJECT is an
// object file. SYMBOLS is the contents of the symbol table
// section, with size SYMBOLS_SIZE. SYMBOL_NAMES is the contents of
// Create dynamic sections if necessary.
void
- create_initial_dynamic_sections(const Input_objects*, Symbol_table*);
+ create_initial_dynamic_sections(Symbol_table*);
// Define __start and __stop symbols for output sections.
void
- define_section_symbols(Symbol_table*, const Target*);
+ define_section_symbols(Symbol_table*);
+
+ // Define symbols from any linker script.
+ void
+ define_script_symbols(Symbol_table* symtab)
+ { this->script_options_->add_symbols_to_table(symtab); }
+
+ // Define symbols for group signatures.
+ void
+ define_group_signatures(Symbol_table*);
// Return the Stringpool used for symbol names.
const Stringpool*
// Finalize the layout after all the input sections have been added.
off_t
- finalize(const Input_objects*, Symbol_table*);
+ finalize(const Input_objects*, Symbol_table*, const Task*);
+
+ // Return whether any sections require postprocessing.
+ bool
+ any_postprocessing_sections() const
+ { return this->any_postprocessing_sections_; }
// Return the size of the output file.
off_t
find_output_segment(elfcpp::PT type, elfcpp::Elf_Word set,
elfcpp::Elf_Word clear) const;
+ // Return the number of segments we expect to produce.
+ size_t
+ expected_segment_count() const;
+
+ // Set a flag to indicate that an object file uses the static TLS model.
+ void
+ set_has_static_tls()
+ { this->has_static_tls_ = true; }
+
+ // Return true if any object file uses the static TLS model.
+ bool
+ has_static_tls() const
+ { return this->has_static_tls_; }
+
+ // Return the options which may be set by a linker script.
+ Script_options*
+ script_options()
+ { return this->script_options_; }
+
+ const Script_options*
+ script_options() const
+ { return this->script_options_; }
+
// Dump statistical information to stderr.
void
print_stats() const;
- // The list of segments.
+ // A list of segments.
typedef std::vector<Output_segment*> Segment_list;
- // The list of sections not attached to a segment.
+ // A list of sections.
typedef std::vector<Output_section*> Section_list;
// either a section or a segment.
typedef std::vector<Output_data*> Data_list;
+ // Store the allocated sections into the section list. This is used
+ // by the linker script code.
+ void
+ get_allocated_sections(Section_list*) const;
+
+ // Make a segment. This is used by the linker script code.
+ Output_segment*
+ make_output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags);
+
+ // Return the number of segments.
+ size_t
+ segment_count() const
+ { return this->segment_list_.size(); }
+
+ // Map from section flags to segment flags.
+ static elfcpp::Elf_Word
+ section_flags_to_segment(elfcpp::Elf_Xword flags);
+
private:
Layout(const Layout&);
Layout& operator=(const Layout&);
static const Linkonce_mapping linkonce_mapping[];
static const int linkonce_mapping_count;
+ // During a relocatable link, a list of group sections and
+ // signatures.
+ struct Group_signature
+ {
+ // The group section.
+ Output_section* section;
+ // The signature.
+ const char* signature;
+
+ Group_signature()
+ : section(NULL), signature(NULL)
+ { }
+
+ Group_signature(Output_section* sectiona, const char* signaturea)
+ : section(sectiona), signature(signaturea)
+ { }
+ };
+ typedef std::vector<Group_signature> Group_signatures;
+
// Create a .note section for gold.
void
create_gold_note();
Output_segment*
find_first_load_seg();
+ // Count the local symbols in the regular symbol table and the dynamic
+ // symbol table, and build the respective string pools.
+ void
+ count_local_symbols(const Task*, const Input_objects*);
+
// Create the output sections for the symbol table.
void
create_symtab_sections(const Input_objects*, Symbol_table*, off_t*);
// Create the dynamic symbol table.
void
- create_dynamic_symtab(const Target*, Symbol_table*, Output_section** pdynstr,
+ create_dynamic_symtab(const Input_objects*, Symbol_table*,
+ Output_section** pdynstr,
unsigned int* plocal_dynamic_count,
std::vector<Symbol*>* pdynamic_symbols,
Versions* versions);
+ // Assign offsets to each local portion of the dynamic symbol table.
+ void
+ assign_local_dynsym_offsets(const Input_objects*);
+
// Finish the .dynamic section and PT_DYNAMIC segment.
void
finish_dynamic_section(const Input_objects*, const Symbol_table*);
get_output_section(const char* name, Stringpool::Key name_key,
elfcpp::Elf_Word type, elfcpp::Elf_Xword flags);
+ // Choose the output section for NAME in RELOBJ.
+ Output_section*
+ choose_output_section(const Relobj* relobj, const char* name,
+ elfcpp::Elf_Word type, elfcpp::Elf_Xword flags,
+ bool adjust_name);
+
// Create a new Output_section.
Output_section*
make_output_section(const char* name, elfcpp::Elf_Word type,
off_t
set_segment_offsets(const Target*, Output_segment*, unsigned int* pshndx);
+ // Set the file offsets of the sections when doing a relocatable
+ // link.
+ off_t
+ set_relocatable_section_offsets(Output_data*, unsigned int* pshndx);
+
// Set the final file offsets of all the sections not associated
// with a segment. We set section offsets in three passes: the
// first handles all allocated sections, the second sections that
- // can be handled after input-sections are processed, and the last
- // the late-bound STRTAB sections (probably only shstrtab, which is
- // the one we care about because it holds section names).
+ // require postprocessing, and the last the late-bound STRTAB
+ // sections (probably only shstrtab, which is the one we care about
+ // because it holds section names).
enum Section_offset_pass
{
BEFORE_INPUT_SECTIONS_PASS,
- AFTER_INPUT_SECTIONS_PASS,
- STRTAB_AFTER_INPUT_SECTIONS_PASS
+ POSTPROCESSING_SECTIONS_PASS,
+ STRTAB_AFTER_POSTPROCESSING_SECTIONS_PASS
};
off_t
set_section_offsets(off_t, Section_offset_pass pass);
unsigned int
set_section_indexes(unsigned int pshndx);
+ // Set the section addresses when using a script.
+ Output_segment*
+ set_section_addresses_from_script(Symbol_table*);
+
// Return whether SEG1 comes before SEG2 in the output file.
static bool
segment_precedes(const Output_segment* seg1, const Output_segment* seg2);
- // Map from section flags to segment flags.
- static elfcpp::Elf_Word
- section_flags_to_segment(elfcpp::Elf_Xword flags);
-
// A mapping used for group signatures.
typedef Unordered_map<std::string, bool> Signatures;
// A reference to the options on the command line.
const General_options& options_;
+ // Information set by scripts or by command line options.
+ Script_options* script_options_;
// The output section names.
Stringpool namepool_;
// The output symbol names.
Eh_frame* eh_frame_data_;
// The exception frame header output section if there is one.
Output_section* eh_frame_hdr_section_;
+ // A list of group sections and their signatures.
+ Group_signatures group_signatures_;
// The size of the output file.
off_t output_file_size_;
// Whether we have seen an object file marked to require an
// Whether we have seen at least one object file without an
// executable stack marker.
bool input_without_gnu_stack_note_;
+ // Whether we have seen an object file that uses the static TLS model.
+ bool has_static_tls_;
+ // Whether any sections require postprocessing.
+ bool any_postprocessing_sections_;
};
// This task handles writing out data in output sections which is not
// The standard Task methods.
- Is_runnable_type
- is_runnable(Workqueue*);
+ Task_token*
+ is_runnable();
- Task_locker*
- locks(Workqueue*);
+ void
+ locks(Task_locker*);
void
run(Workqueue*);
// The standard Task methods.
- Is_runnable_type
- is_runnable(Workqueue*);
+ Task_token*
+ is_runnable();
- Task_locker*
- locks(Workqueue*);
+ void
+ locks(Task_locker*);
void
run(Workqueue*);
// The standard Task methods.
- Is_runnable_type
- is_runnable(Workqueue*);
+ Task_token*
+ is_runnable();
- Task_locker*
- locks(Workqueue*);
+ void
+ locks(Task_locker*);
void
run(Workqueue*);
// The standard Task methods.
- Is_runnable_type
- is_runnable(Workqueue*);
+ Task_token*
+ is_runnable();
- Task_locker*
- locks(Workqueue*);
+ void
+ locks(Task_locker*);
void
run(Workqueue*);
{ return "Write_after_input_sections_task"; }
private:
- class Write_sections_locker;
-
Layout* layout_;
Output_file* of_;
Task_token* input_sections_blocker_;
// Run the operation.
void
- run(Workqueue*);
+ run(Workqueue*, const Task*);
private:
Output_file* of_;
projects / binutils-gdb.git / blobdiff