// layout.h -- lay out output file sections for gold -*- C++ -*-
-// Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012
+// Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
// Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
get_section_order_map()
{ return &this->section_order_map_; }
+ // Struct to store segment info when mapping some input sections to
+ // unique segments using linker plugins. Mapping an input section to
+ // a unique segment is done by first placing such input sections in
+ // unique output sections and then mapping the output section to a
+ // unique segment. NAME is the name of the output section. FLAGS
+ // and ALIGN are the extra flags and alignment of the segment.
+ struct Unique_segment_info
+ {
+ // Identifier for the segment. ELF segments dont have names. This
+ // is used as the name of the output section mapped to the segment.
+ const char* name;
+ // Additional segment flags.
+ uint64_t flags;
+ // Segment alignment.
+ uint64_t align;
+ };
+
+ // Mapping from input section to segment.
+ typedef std::map<Const_section_id, Unique_segment_info*>
+ Section_segment_map;
+
+ // Maps section SECN to SEGMENT s.
+ void
+ insert_section_segment_map(Const_section_id secn, Unique_segment_info *s);
+
+ // Some input sections require special ordering, for compatibility
+ // with GNU ld. Given the name of an input section, return -1 if it
+ // does not require special ordering. Otherwise, return the index
+ // by which it should be ordered compared to other input sections
+ // that require special ordering.
+ static int
+ special_ordering_of_input_section(const char* name);
+
bool
is_section_ordering_specified()
{ return this->section_ordering_specified_; }
set_section_ordering_specified()
{ this->section_ordering_specified_ = true; }
+ bool
+ is_unique_segment_for_sections_specified() const
+ { return this->unique_segment_for_sections_specified_; }
+
+ void
+ set_unique_segment_for_sections_specified()
+ { this->unique_segment_for_sections_specified_ = true; }
+
// For incremental updates, allocate a block of memory from the
// free list. Find a block starting at or after MINOFF.
off_t
const Output_data_reloc_generic* dyn_rel,
bool add_debug, bool dynrel_includes_plt);
+ // If a treehash is necessary to compute the build ID, then queue
+ // the necessary tasks and return a blocker that will unblock when
+ // they finish. Otherwise return BUILD_ID_BLOCKER.
+ Task_token*
+ queue_build_id_tasks(Workqueue* workqueue, Task_token* build_id_blocker,
+ Output_file* of);
+
// Compute and write out the build ID if needed.
void
write_build_id(Output_file*) const;
void
get_allocated_sections(Section_list*) const;
+ // Store the executable sections into the section list.
+ void
+ get_executable_sections(Section_list*) const;
+
// Make a section for a linker script to hold data.
Output_section*
make_output_section_for_script(const char* name,
// be mapped to an output section that should be KEPT.
bool
keep_input_section(const Relobj*, const char*);
-
+
+ // Add a special output object that will be recreated afresh
+ // if there is another relaxation iteration.
+ void
+ add_relax_output(Output_data* data)
+ { this->relax_output_list_.push_back(data); }
+
+ // Clear out (and free) everything added by add_relax_output.
+ void
+ reset_relax_output();
+
private:
Layout(const Layout&);
Layout& operator=(const Layout&);
elfcpp::Elf_Word type, elfcpp::Elf_Xword flags,
Output_section_order order, bool is_relro);
+ // Clear the input section flags that should not be copied to the
+ // output section.
+ elfcpp::Elf_Xword
+ get_output_section_flags (elfcpp::Elf_Xword input_section_flags);
+
// Choose the output section for NAME in RELOBJ.
Output_section*
choose_output_section(const Relobj* relobj, const char* name,
// 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&);
+ const Layout::Data_list& special_outputs,
+ const Layout::Data_list& relax_outputs);
// Record information of a section list.
void
// The list of unattached Output_data objects which require special
// handling because they are not Output_sections.
Data_list special_output_list_;
+ // Like special_output_list_, but cleared and recreated on each
+ // iteration of relaxation.
+ Data_list relax_output_list_;
// The section headers.
Output_section_headers* section_headers_;
// A pointer to the PT_TLS segment if there is one.
Gdb_index* gdb_index_data_;
// The space for the build ID checksum if there is one.
Output_section_data* build_id_note_;
+ // Temporary storage for tree hash of build ID.
+ unsigned char* array_of_hashes_;
+ // Size of array_of_hashes_ (in bytes).
+ size_t size_of_array_of_hashes_;
+ // Input view for computing tree hash of build ID. Freed in write_build_id().
+ const unsigned char* input_view_;
// The output section containing dwarf abbreviations
Output_reduced_debug_abbrev_section* debug_abbrev_;
// The output section containing the dwarf debug info tree
// True if the input sections in the output sections should be sorted
// as specified in a section ordering file.
bool section_ordering_specified_;
+ // True if some input sections need to be mapped to a unique segment,
+ // after being mapped to a unique Output_section.
+ bool unique_segment_for_sections_specified_;
// In incremental build, holds information check the inputs and build the
// .gnu_incremental_inputs section.
Incremental_inputs* incremental_inputs_;
// Plugins specify section_ordering using this map. This is set in
// update_section_order in plugin.cc
std::map<Section_id, unsigned int> section_order_map_;
+ // This maps an input section to a unique segment. This is done by first
+ // placing such input sections in unique output sections and then mapping
+ // the output section to a unique segment. Unique_segment_info stores
+ // any additional flags and alignment of the new segment.
+ Section_segment_map section_segment_map_;
// Hash a pattern to its position in the section ordering file.
Unordered_map<std::string, unsigned int> input_section_position_;
// Vector of glob only patterns in the section_ordering file.
{
public:
Write_symbols_task(const Layout* layout, const Symbol_table* symtab,
- const Input_objects* input_objects,
+ const Input_objects* /*input_objects*/,
const Stringpool* sympool, const Stringpool* dynpool,
Output_file* of, Task_token* final_blocker)
- : layout_(layout), symtab_(symtab), input_objects_(input_objects),
+ : layout_(layout), symtab_(symtab),
sympool_(sympool), dynpool_(dynpool), of_(of),
final_blocker_(final_blocker)
{ }
private:
const Layout* layout_;
const Symbol_table* symtab_;
- const Input_objects* input_objects_;
const Stringpool* sympool_;
const Stringpool* dynpool_;
Output_file* of_;
projects / deliverable / binutils-gdb.git / blobdiff