class Output_section_data;
class Output_section;
class Output_section_headers;
+class Output_segment_headers;
+class Output_file_header;
class Output_segment;
class Output_data;
class Output_data_dynamic;
public:
Layout(int number_of_input_files, Script_options*);
+ ~Layout()
+ {
+ delete this->relaxation_debug_check_;
+ delete this->segment_states_;
+ }
+
// Given an input section SHNDX, named NAME, with data in SHDR, from
// the object file OBJECT, return the output section where this
// input section should go. RELOC_SHNDX is the index of a
layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags);
// Add an Output_section_data to the layout. This is used for
- // special sections like the GOT section.
+ // special sections like the GOT section. IS_DYNAMIC_LINKER_SECTION
+ // is true for sections which are used by the dynamic linker, such
+ // as dynamic reloc sections.
Output_section*
add_output_section_data(const char* name, elfcpp::Elf_Word type,
elfcpp::Elf_Xword flags,
- Output_section_data*);
+ Output_section_data*, bool is_dynamic_linker_section);
// Create dynamic sections if necessary.
void
void
attach_sections_to_segments();
+ // For relaxation clean up, we need to know output section data created
+ // from a linker script.
+ void
+ new_output_section_data_from_script(Output_section_data* posd)
+ {
+ if (this->record_output_section_data_from_script_)
+ this->script_output_section_data_list_.push_back(posd);
+ }
+
+ // Return section list.
+ const Section_list&
+ section_list() const
+ { return this->section_list_; }
+
private:
Layout(const Layout&);
Layout& operator=(const Layout&);
// Return the output section for NAME, TYPE and FLAGS.
Output_section*
get_output_section(const char* name, Stringpool::Key name_key,
- elfcpp::Elf_Word type, elfcpp::Elf_Xword flags);
+ elfcpp::Elf_Word type, elfcpp::Elf_Xword flags,
+ bool is_interp, bool is_dynamic_linker_section);
// 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 is_input_section);
+ bool is_input_section, bool is_interp,
+ bool is_dynamic_linker_section);
// Create a new Output_section.
Output_section*
make_output_section(const char* name, elfcpp::Elf_Word type,
- elfcpp::Elf_Xword flags);
+ elfcpp::Elf_Xword flags, bool is_interp,
+ bool is_dynamic_linker_section);
// Attach a section to a segment.
void
Output_segment*
set_section_addresses_from_script(Symbol_table*);
+ // Find appropriate places or orphan sections in a script.
+ void
+ place_orphan_sections_in_script();
+
// Return whether SEG1 comes before SEG2 in the output file.
static bool
segment_precedes(const Output_segment* seg1, const Output_segment* seg2);
+ // Use to save and restore segments during relaxation.
+ typedef Unordered_map<const Output_segment*, const Output_segment*>
+ Segment_states;
+
+ // Save states of current output segments.
+ void
+ save_segments(Segment_states*);
+
+ // Restore output segment states.
+ void
+ restore_segments(const Segment_states*);
+
+ // Clean up after relaxation so that it is possible to lay out the
+ // sections and segments again.
+ void
+ clean_up_after_relaxation();
+
+ // Doing preparation work for relaxation. This is factored out to make
+ // Layout::finalized a bit smaller and easier to read.
+ void
+ prepare_for_relaxation();
+
+ // Main body of the relaxation loop, which lays out the section.
+ off_t
+ relaxation_loop_body(int, Target*, Symbol_table*, Output_segment**,
+ Output_segment*, Output_segment_headers*,
+ Output_file_header*, unsigned int*);
+
// A mapping used for kept comdats/.gnu.linkonce group signatures.
typedef Unordered_map<std::string, Kept_section> Signatures;
{ return Layout::segment_precedes(seg1, seg2); }
};
+ typedef std::vector<Output_section_data*> Output_section_data_list;
+
+ // Debug checker class.
+ class Relaxation_debug_check
+ {
+ public:
+ Relaxation_debug_check()
+ : section_infos_()
+ { }
+
+ // Check that sections and special data are in reset states.
+ void
+ check_output_data_for_reset_values(const Layout::Section_list&,
+ const Layout::Data_list&);
+
+ // Record information of a section list.
+ void
+ read_sections(const Layout::Section_list&);
+
+ // Verify a section list with recorded information.
+ void
+ verify_sections(const Layout::Section_list&);
+
+ private:
+ // Information we care about a section.
+ struct Section_info
+ {
+ // Output section described by this.
+ Output_section* output_section;
+ // Load address.
+ uint64_t address;
+ // Data size.
+ off_t data_size;
+ // File offset.
+ off_t offset;
+ };
+
+ // Section information.
+ std::vector<Section_info> section_infos_;
+ };
+
// The number of input files, for sizing tables.
int number_of_input_files_;
// Information set by scripts or by command line options.
// In incremental build, holds information check the inputs and build the
// .gnu_incremental_inputs section.
Incremental_inputs* incremental_inputs_;
+ // Whether we record output section data created in script
+ bool record_output_section_data_from_script_;
+ // List of output data that needs to be removed at relexation clean up.
+ Output_section_data_list script_output_section_data_list_;
+ // Structure to save segment states before entering the relaxation loop.
+ Segment_states* segment_states_;
+ // A relaxation debug checker. We only create one when in debugging mode.
+ Relaxation_debug_check* relaxation_debug_check_;
};
// This task handles writing out data in output sections which is not
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