210 lines
5.5 KiB
C++
210 lines
5.5 KiB
C++
// layout.h -- lay out output file sections for gold -*- C++ -*-
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#ifndef GOLD_LAYOUT_H
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#define GOLD_LAYOUT_H
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#include <list>
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#include <string>
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#include <utility>
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#include <vector>
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#include "options.h"
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#include "workqueue.h"
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#include "object.h"
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#include "stringpool.h"
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namespace gold
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{
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class Input_objects;
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class Output_section;
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class Output_section_symtab;
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class Output_segment;
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class Output_data;
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// This Task handles mapping the input sections to output sections and
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// laying them out in memory.
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class Layout_task : public Task
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{
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public:
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// OPTIONS is the command line options, INPUT_OBJECTS is the list of
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// input objects, THIS_BLOCKER is a token which blocks this task
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// from executing until all the input symbols have been read.
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Layout_task(const General_options& options,
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const Input_objects* input_objects,
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Task_token* this_blocker)
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: options_(options), input_objects_(input_objects),
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this_blocker_(this_blocker)
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{ }
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~Layout_task();
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// The standard Task methods.
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Is_runnable_type
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is_runnable(Workqueue*);
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Task_locker*
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locks(Workqueue*);
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void
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run(Workqueue*);
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private:
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Layout_task(const Layout_task&);
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Layout_task& operator=(const Layout_task&);
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const General_options& options_;
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const Input_objects* input_objects_;
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Task_token* this_blocker_;
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};
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// This class handles the details of laying out input sections.
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class Layout
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{
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public:
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Layout(const General_options& options);
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// Initialize the object.
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void
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init();
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// Given an input section named NAME with data in SHDR from the
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// object file OBJECT, return the output section where this input
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// section should go. Set *OFFSET to the offset within the output
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// section.
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template<int size, bool big_endian>
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Output_section*
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layout(Object *object, const char* name,
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const elfcpp::Shdr<size, big_endian>& shdr, off_t* offset);
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// Return whether a section is a .gnu.linkonce section, given the
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// section name.
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static inline bool
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is_linkonce(const char* name)
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{ return strncmp(name, ".gnu.linkonce", sizeof(".gnu.linkonce") - 1) == 0; }
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// Record the signature of a comdat section, and return whether to
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// include it in the link. The GROUP parameter is true for a
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// section group signature, false for a signature derived from a
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// .gnu.linkonce section.
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bool
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add_comdat(const char*, bool group);
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// Finalize the layout after all the input sections have been added.
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void
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finalize(const Input_objects*);
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// The list of segments.
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typedef std::vector<Output_segment*> Segment_list;
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// The list of sections not attached to a segment.
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typedef std::list<Output_section*> Section_list;
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// The list of information to write out which is not attached to
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// either a section or a segment.
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typedef std::list<Output_data*> Data_list;
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private:
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Layout(const Layout&);
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Layout& operator=(const Layout&);
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// Mapping from .gnu.linkonce section names to output section names.
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struct Linkonce_mapping
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{
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const char* from;
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int fromlen;
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const char* to;
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};
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static const Linkonce_mapping linkonce_mapping[];
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static const int linkonce_mapping_count;
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// Lay out the local symbols from a SHT_SYMTAB section.
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template<int size, bool big_endian>
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void
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add_symtab_locals(Object* object, const elfcpp::Shdr<size, big_endian>&);
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// Create the output sections for the symbol table.
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void
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create_symtab_sections();
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// Finalize the symbol table.
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void
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finalize_symtab();
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// Return whether to include this section in the link.
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template<int size, bool big_endian>
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bool
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include_section(Object* object, const char* name,
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const elfcpp::Shdr<size, big_endian>&);
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// Return the output section name to use for a linkonce section
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// name.
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static const char*
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linkonce_output_name(const char* name);
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// Create a new Output_section.
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Output_section*
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make_output_section(const char* name, elfcpp::Elf_Word type,
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elfcpp::Elf_Xword flags);
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// Return whether SEG1 comes before SEG2 in the output file.
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static bool
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Layout::segment_precedes(const Output_segment* seg1,
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const Output_segment* seg2);
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// Map from section flags to segment flags.
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static elfcpp::Elf_Word
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section_flags_to_segment(elfcpp::Elf_Xword flags);
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// A mapping used for group signatures.
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typedef Unordered_map<std::string, bool> Signatures;
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// Mapping from input section name/type/flags to output section. We
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// use canonicalized strings here.
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typedef std::pair<const char*,
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std::pair<elfcpp::Elf_Word, elfcpp::Elf_Xword> > Key;
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struct Hash_key
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{
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size_t
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operator()(const Key& k) const;
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};
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typedef Unordered_map<Key, Output_section*, Hash_key> Section_name_map;
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// A comparison class for segments.
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struct Compare_segments
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{
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bool
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operator()(const Output_segment* seg1, const Output_segment* seg2)
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{ return Layout::segment_precedes(seg1, seg2); }
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};
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// A reference to the options on the command line.
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const General_options& options_;
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// The output section names.
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Stringpool namepool_;
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// The list of group sections and linkonce sections which we have seen.
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Signatures signatures_;
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// The mapping from input section name/type/flags to output sections.
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Section_name_map section_name_map_;
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// The list of output segments.
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Segment_list segment_list_;
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// The list of output sections which are not attached to any output
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// segment.
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Section_list section_list_;
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// The list of output data objects which are not attached to any
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// output section or output segment.
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Data_list data_list_;
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};
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} // End namespace gold.
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#endif // !defined(GOLD_LAYOUT_H)
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