// inremental.h -- incremental linking support for gold -*- C++ -*-
-// Copyright 2009 Free Software Foundation, Inc.
+// Copyright 2009, 2010 Free Software Foundation, Inc.
// Written by Mikolaj Zalewski <mikolajz@google.com>.
// This file is part of gold.
#ifndef GOLD_INCREMENTAL_H
#define GOLD_INCREMENTAL_H
+#include <map>
#include <vector>
+#include "elfcpp_file.h"
#include "stringpool.h"
#include "workqueue.h"
+#include "fileread.h"
+#include "output.h"
namespace gold
{
class Archive;
class Input_argument;
class Incremental_inputs_checker;
+class Incremental_script_entry;
+class Incremental_object_entry;
+class Incremental_archive_entry;
+class Incremental_inputs;
class Object;
-class Output_section_data;
+
+// Incremental input type as stored in .gnu_incremental_inputs.
+
+enum Incremental_input_type
+{
+ INCREMENTAL_INPUT_OBJECT = 1,
+ INCREMENTAL_INPUT_ARCHIVE_MEMBER = 2,
+ INCREMENTAL_INPUT_ARCHIVE = 3,
+ INCREMENTAL_INPUT_SHARED_LIBRARY = 4,
+ INCREMENTAL_INPUT_SCRIPT = 5
+};
+
+// An object representing the ELF file we edit during an incremental build.
+// Similar to Object or Dynobj, but operates on Output_file and contains
+// method specific to file edition (TBD). This is the abstract parent class
+// implemented in Sized_incremental_binary<size, big_endian> for a specific
+// endianness and size.
+
+class Incremental_binary
+{
+ public:
+ Incremental_binary(Output_file* output, Target* target)
+ : output_(output), target_(target)
+ { }
+
+ virtual
+ ~Incremental_binary()
+ { }
+
+ // Functions and types for the elfcpp::Elf_file interface. This
+ // permit us to use Incremental_binary as the File template parameter for
+ // elfcpp::Elf_file.
+
+ // The View class is returned by view. It must support a single
+ // method, data(). This is trivial, because Output_file::get_output_view
+ // does what we need.
+ class View
+ {
+ public:
+ View(const unsigned char* p)
+ : p_(p)
+ { }
+
+ const unsigned char*
+ data() const
+ { return this->p_; }
+
+ private:
+ const unsigned char* p_;
+ };
+
+ // Return a View.
+ View
+ view(off_t file_offset, section_size_type data_size)
+ { return View(this->output_->get_input_view(file_offset, data_size)); }
+
+ // A location in the file.
+ struct Location
+ {
+ off_t file_offset;
+ off_t data_size;
+
+ Location(off_t fo, section_size_type ds)
+ : file_offset(fo), data_size(ds)
+ { }
+
+ Location()
+ : file_offset(0), data_size(0)
+ { }
+ };
+
+ // Get a View given a Location.
+ View
+ view(Location loc)
+ { return View(this->view(loc.file_offset, loc.data_size)); }
+
+ // Report an error.
+ void
+ error(const char* format, ...) const ATTRIBUTE_PRINTF_2;
+
+ // Find the .gnu_incremental_inputs and related sections. It selects the
+ // first section of type SHT_GNU_INCREMENTAL_INPUTS,
+ // SHT_GNU_INCREMENTAL_SYMTAB, and SHT_GNU_INCREMENTAL_RELOCS.
+ // Returns false if the sections are not found.
+ bool
+ find_incremental_inputs_sections(unsigned int* p_inputs_shndx,
+ unsigned int* p_symtab_shndx,
+ unsigned int* p_relocs_shndx,
+ unsigned int* p_got_plt_shndx,
+ unsigned int* p_strtab_shndx)
+ {
+ return do_find_incremental_inputs_sections(p_inputs_shndx, p_symtab_shndx,
+ p_relocs_shndx, p_got_plt_shndx,
+ p_strtab_shndx);
+ }
+
+ // Check the .gnu_incremental_inputs section to see whether an incremental
+ // build is possible.
+ // TODO: on success, should report what files needs to be rebuilt.
+ // INCREMENTAL_INPUTS is used to read the canonical form of the command line
+ // and read the input arguments. TODO: for items that don't need to be
+ // rebuilt, we should also copy the incremental input information.
+ virtual bool
+ check_inputs(Incremental_inputs* incremental_inputs)
+ { return do_check_inputs(incremental_inputs); }
+
+ protected:
+ // Find incremental inputs section.
+ virtual bool
+ do_find_incremental_inputs_sections(unsigned int* p_inputs_shndx,
+ unsigned int* p_symtab_shndx,
+ unsigned int* p_relocs_shndx,
+ unsigned int* p_got_plt_shndx,
+ unsigned int* p_strtab_shndx) = 0;
+
+ // Check the .gnu_incremental_inputs section to see whether an incremental
+ // build is possible.
+ virtual bool
+ do_check_inputs(Incremental_inputs* incremental_inputs) = 0;
+
+ private:
+ // Edited output file object.
+ Output_file* output_;
+ // Target of the output file.
+ Target* target_;
+};
+
+template<int size, bool big_endian>
+class Sized_incremental_binary : public Incremental_binary
+{
+ public:
+ Sized_incremental_binary(Output_file* output,
+ const elfcpp::Ehdr<size, big_endian>& ehdr,
+ Target* target)
+ : Incremental_binary(output, target), elf_file_(this, ehdr)
+ { }
+
+ protected:
+ virtual bool
+ do_find_incremental_inputs_sections(unsigned int* p_inputs_shndx,
+ unsigned int* p_symtab_shndx,
+ unsigned int* p_relocs_shndx,
+ unsigned int* p_got_plt_shndx,
+ unsigned int* p_strtab_shndx);
+
+ virtual bool
+ do_check_inputs(Incremental_inputs* incremental_inputs);
+
+ private:
+ // Output as an ELF file.
+ elfcpp::Elf_file<size, big_endian, Incremental_binary> elf_file_;
+};
+
+// Create an Incremental_binary object for FILE. Returns NULL is this is not
+// possible, e.g. FILE is not an ELF file or has an unsupported target.
+
+Incremental_binary*
+open_incremental_binary(Output_file* file);
+
+// Code invoked early during an incremental link that checks what files need
+// to be relinked.
+
+class Incremental_checker
+{
+ public:
+ // Check if the file named OUTPUT_NAME can be linked incrementally.
+ // INCREMENTAL_INPUTS must have the canonical form of the command line
+ // and input arguments filled - at this point of linking other fields are
+ // probably not filled yet. TODO: for inputs that don't need to be
+ // rebuilt, this function should fill the incremental input information.
+ Incremental_checker(const char* output_name,
+ Incremental_inputs* incremental_inputs)
+ : output_name_(output_name), incremental_inputs_(incremental_inputs)
+ { }
+
+ // Analyzes the output file to check if incremental linking is possible and
+ // what files needs to be relinked.
+ bool
+ can_incrementally_link_output_file();
+
+ private:
+ // Name of the output file to analyze.
+ const char* output_name_;
+
+ // The Incremental_inputs object. At this stage of link, only the command
+ // line and inputs are filled.
+ Incremental_inputs* incremental_inputs_;
+};
+
+// Base class for recording each input file.
+
+class Incremental_input_entry
+{
+ public:
+ Incremental_input_entry(Stringpool::Key filename_key, Timespec mtime)
+ : filename_key_(filename_key), offset_(0), info_offset_(0), mtime_(mtime)
+ { }
+
+ virtual
+ ~Incremental_input_entry()
+ { }
+
+ // Return the type of input file.
+ Incremental_input_type
+ type() const
+ { return this->do_type(); }
+
+ // Set the section offset of this input file entry.
+ void
+ set_offset(unsigned int offset)
+ { this->offset_ = offset; }
+
+ // Set the section offset of the supplemental information for this entry.
+ void
+ set_info_offset(unsigned int info_offset)
+ { this->info_offset_ = info_offset; }
+
+ // Get the section offset of this input file entry.
+ unsigned int
+ get_offset() const
+ { return this->offset_; }
+
+ // Get the section offset of the supplemental information for this entry.
+ unsigned int
+ get_info_offset() const
+ { return this->info_offset_; }
+
+ // Get the stringpool key for the input filename.
+ Stringpool::Key
+ get_filename_key() const
+ { return this->filename_key_; }
+
+ // Get the modification time of the input file.
+ const Timespec&
+ get_mtime() const
+ { return this->mtime_; }
+
+ // Return a pointer to the derived Incremental_script_entry object.
+ // Return NULL for input entries that are not script files.
+ Incremental_script_entry*
+ script_entry()
+ { return this->do_script_entry(); }
+
+ // Return a pointer to the derived Incremental_object_entry object.
+ // Return NULL for input entries that are not object files.
+ Incremental_object_entry*
+ object_entry()
+ { return this->do_object_entry(); }
+
+ // Return a pointer to the derived Incremental_archive_entry object.
+ // Return NULL for input entries that are not archive files.
+ Incremental_archive_entry*
+ archive_entry()
+ { return this->do_archive_entry(); }
+
+ protected:
+ // Return the type of input file.
+ virtual Incremental_input_type
+ do_type() const = 0;
+
+ // Return a pointer to the derived Incremental_script_entry object.
+ // Return NULL for input entries that are not script files.
+ virtual Incremental_script_entry*
+ do_script_entry()
+ { return NULL; }
+
+ // Return a pointer to the derived Incremental_object_entry object.
+ // Return NULL for input entries that are not object files.
+ virtual Incremental_object_entry*
+ do_object_entry()
+ { return NULL; }
+
+ // Return a pointer to the derived Incremental_archive_entry object.
+ // Return NULL for input entries that are not archive files.
+ virtual Incremental_archive_entry*
+ do_archive_entry()
+ { return NULL; }
+
+ private:
+ // Key of the filename string in the section stringtable.
+ Stringpool::Key filename_key_;
+
+ // Offset of the entry in the output section.
+ unsigned int offset_;
+
+ // Offset of the extra information in the output section.
+ unsigned int info_offset_;
+
+ // Last modification time of the file.
+ Timespec mtime_;
+};
+
+// Class for recording input scripts.
+
+class Incremental_script_entry : public Incremental_input_entry
+{
+ public:
+ Incremental_script_entry(Stringpool::Key filename_key, Script_info* script,
+ Timespec mtime)
+ : Incremental_input_entry(filename_key, mtime), script_(script)
+ { }
+
+ protected:
+ virtual Incremental_input_type
+ do_type() const
+ { return INCREMENTAL_INPUT_SCRIPT; }
+
+ // Return a pointer to the derived Incremental_script_entry object.
+ virtual Incremental_script_entry*
+ do_script_entry()
+ { return this; }
+
+ private:
+ // Information about the script file.
+ Script_info* script_;
+};
+
+// Class for recording input object files.
+
+class Incremental_object_entry : public Incremental_input_entry
+{
+ public:
+ Incremental_object_entry(Stringpool::Key filename_key, Object* obj,
+ Timespec mtime)
+ : Incremental_input_entry(filename_key, mtime), obj_(obj),
+ is_member_(false), sections_()
+ {
+ if (!obj_->is_dynamic())
+ this->sections_.reserve(obj->shnum());
+ }
+
+ // Get the object.
+ Object*
+ object() const
+ { return this->obj_; }
+
+ // Record that this object is an archive member.
+ void
+ set_is_member()
+ { this->is_member_ = true; }
+
+ // Return true if this object is an archive member.
+ bool
+ is_member() const
+ { return this->is_member_; }
+
+ // Add an input section.
+ void
+ add_input_section(unsigned int shndx, Stringpool::Key name_key, off_t sh_size)
+ {
+ if (shndx >= this->sections_.size())
+ this->sections_.resize(shndx + 1);
+ this->sections_[shndx].name_key = name_key;
+ this->sections_[shndx].sh_size = sh_size;
+ }
+
+ // Return the number of input sections in this object.
+ unsigned int
+ get_input_section_count() const
+ { return this->sections_.size(); }
+
+ // Return the stringpool key of the Nth input section.
+ Stringpool::Key
+ get_input_section_name_key(unsigned int n) const
+ { return this->sections_[n].name_key; }
+
+ // Return the size of the Nth input section.
+ off_t
+ get_input_section_size(unsigned int n) const
+ { return this->sections_[n].sh_size; }
+
+ protected:
+ virtual Incremental_input_type
+ do_type() const
+ {
+ return (this->is_member_
+ ? INCREMENTAL_INPUT_ARCHIVE_MEMBER
+ : (this->obj_->is_dynamic()
+ ? INCREMENTAL_INPUT_SHARED_LIBRARY
+ : INCREMENTAL_INPUT_OBJECT));
+ }
+
+ // Return a pointer to the derived Incremental_object_entry object.
+ virtual Incremental_object_entry*
+ do_object_entry()
+ { return this; }
+
+ private:
+ // The object file itself.
+ Object* obj_;
+
+ // Whether this object is an archive member.
+ bool is_member_;
+
+ // Input sections.
+ struct Input_section
+ {
+ Stringpool::Key name_key;
+ off_t sh_size;
+ };
+ std::vector<Input_section> sections_;
+};
+
+// Class for recording archive library input files.
+
+class Incremental_archive_entry : public Incremental_input_entry
+{
+ public:
+ Incremental_archive_entry(Stringpool::Key filename_key, Archive*,
+ Timespec mtime)
+ : Incremental_input_entry(filename_key, mtime), members_(), unused_syms_()
+ { }
+
+ // Add a member object to the archive.
+ void
+ add_object(Incremental_object_entry* obj_entry)
+ {
+ this->members_.push_back(obj_entry);
+ obj_entry->set_is_member();
+ }
+
+ // Add an unused global symbol to the archive.
+ void
+ add_unused_global_symbol(Stringpool::Key symbol_key)
+ { this->unused_syms_.push_back(symbol_key); }
+
+ // Return the number of member objects included in the link.
+ unsigned int
+ get_member_count()
+ { return this->members_.size(); }
+
+ // Return the Nth member object.
+ Incremental_object_entry*
+ get_member(unsigned int n)
+ { return this->members_[n]; }
+
+ // Return the number of unused global symbols in this archive.
+ unsigned int
+ get_unused_global_symbol_count()
+ { return this->unused_syms_.size(); }
+
+ // Return the Nth unused global symbol.
+ Stringpool::Key
+ get_unused_global_symbol(unsigned int n)
+ { return this->unused_syms_[n]; }
+
+ protected:
+ virtual Incremental_input_type
+ do_type() const
+ { return INCREMENTAL_INPUT_ARCHIVE; }
+
+ // Return a pointer to the derived Incremental_archive_entry object.
+ virtual Incremental_archive_entry*
+ do_archive_entry()
+ { return this; }
+
+ private:
+ // Members of the archive that have been included in the link.
+ std::vector<Incremental_object_entry*> members_;
+
+ // Unused global symbols from this archive.
+ std::vector<Stringpool::Key> unused_syms_;
+};
// This class contains the information needed during an incremental
// build about the inputs necessary to build the .gnu_incremental_inputs.
+
class Incremental_inputs
{
public:
+ typedef std::vector<Incremental_input_entry*> Input_list;
+
Incremental_inputs()
- : command_line_key_(0), strtab_(new Stringpool())
+ : inputs_(), command_line_(), command_line_key_(0),
+ strtab_(new Stringpool()), current_object_(NULL),
+ current_object_entry_(NULL), inputs_section_(NULL),
+ symtab_section_(NULL), relocs_section_(NULL),
+ reloc_count_(0)
{ }
+
~Incremental_inputs() { delete this->strtab_; }
// Record the command line.
void
report_command_line(int argc, const char* const* argv);
-
+
+ // Record the initial info for archive file ARCHIVE.
+ void
+ report_archive_begin(Archive* arch);
+
+ // Record the final info for archive file ARCHIVE.
+ void
+ report_archive_end(Archive* arch);
+
+ // Record the info for object file OBJ. If ARCH is not NULL,
+ // attach the object file to the archive.
+ void
+ report_object(Object* obj, Archive* arch);
+
+ // Record an input section belonging to object file OBJ.
+ void
+ report_input_section(Object* obj, unsigned int shndx, const char* name,
+ off_t sh_size);
+
+ // Record the info for input script SCRIPT.
+ void
+ report_script(const std::string& filename, Script_info* script,
+ Timespec mtime);
+
+ // Return the running count of incremental relocations.
+ unsigned int
+ get_reloc_count() const
+ { return this->reloc_count_; }
+
+ // Update the running count of incremental relocations.
+ void
+ set_reloc_count(unsigned int count)
+ { this->reloc_count_ = count; }
+
// Prepare for layout. Called from Layout::finalize.
void
finalize();
- // Create the content of the .gnu_incremental_inputs section.
+ // Create the .gnu_incremental_inputs and related sections.
+ void
+ create_data_sections(Symbol_table* symtab);
+
+ // Return the .gnu_incremental_inputs section.
Output_section_data*
- create_incremental_inputs_section_data();
-
- // Return the .gnu_incremental_strtab stringpool.
+ inputs_section() const
+ { return this->inputs_section_; }
+
+ // Return the .gnu_incremental_symtab section.
+ Output_data_space*
+ symtab_section() const
+ { return this->symtab_section_; }
+
+ // Return the .gnu_incremental_relocs section.
+ Output_data_space*
+ relocs_section() const
+ { return this->relocs_section_; }
+
+ // Return the .gnu_incremental_got_plt section.
+ Output_data_space*
+ got_plt_section() const
+ { return this->got_plt_section_; }
+
+ // Return the .gnu_incremental_strtab stringpool.
Stringpool*
- get_stringpool()
+ get_stringpool() const
{ return this->strtab_; }
+ // Return the canonical form of the command line, as will be stored in
+ // .gnu_incremental_strtab.
+ const std::string&
+ command_line() const
+ { return this->command_line_; }
+
+ // Return the stringpool key of the command line.
+ Stringpool::Key
+ command_line_key() const
+ { return this->command_line_key_; }
+
+ // Return the number of input files.
+ int
+ input_file_count() const
+ { return this->inputs_.size(); }
+
+ // Return the input files.
+ const Input_list&
+ input_files() const
+ { return this->inputs_; }
+
+ // Return the sh_entsize value for the .gnu_incremental_relocs section.
+ unsigned int
+ relocs_entsize() const;
+
private:
- // Code for each of the four possible variants of create_inputs_section_data.
- template<int size, bool big_endian>
- Output_section_data*
- sized_create_inputs_section_data();
+ // The list of input files.
+ Input_list inputs_;
+
+ // Canonical form of the command line, as will be stored in
+ // .gnu_incremental_strtab.
+ std::string command_line_;
// The key of the command line string in the string pool.
Stringpool::Key command_line_key_;
+
// The .gnu_incremental_strtab string pool associated with the
// .gnu_incremental_inputs.
Stringpool* strtab_;
+
+ // Keep track of the object currently being processed.
+ Object* current_object_;
+ Incremental_object_entry* current_object_entry_;
+
+ // The .gnu_incremental_inputs section.
+ Output_section_data* inputs_section_;
+
+ // The .gnu_incremental_symtab section.
+ Output_data_space* symtab_section_;
+
+ // The .gnu_incremental_relocs section.
+ Output_data_space* relocs_section_;
+
+ // The .gnu_incremental_got_plt section.
+ Output_data_space* got_plt_section_;
+
+ // Total count of incremental relocations. Updated during Scan_relocs
+ // phase at the completion of each object file.
+ unsigned int reloc_count_;
+};
+
+// Reader class for .gnu_incremental_inputs section.
+
+template<int size, bool big_endian>
+class Incremental_inputs_reader
+{
+ private:
+ typedef elfcpp::Swap<size, big_endian> Swap;
+ typedef elfcpp::Swap<16, big_endian> Swap16;
+ typedef elfcpp::Swap<32, big_endian> Swap32;
+ typedef elfcpp::Swap<64, big_endian> Swap64;
+
+ public:
+ Incremental_inputs_reader(const unsigned char* p, elfcpp::Elf_strtab& strtab)
+ : p_(p), strtab_(strtab)
+ { this->input_file_count_ = Swap32::readval(this->p_ + 4); }
+
+ // Return the version number.
+ unsigned int
+ version() const
+ { return Swap32::readval(this->p_); }
+
+ // Return the count of input file entries.
+ unsigned int
+ input_file_count() const
+ { return this->input_file_count_; }
+
+ // Return the command line.
+ const char*
+ command_line() const
+ {
+ unsigned int offset = Swap32::readval(this->p_ + 8);
+ return this->get_string(offset);
+ }
+
+ // Reader class for an input file entry and its supplemental info.
+ class Incremental_input_entry_reader
+ {
+ public:
+ Incremental_input_entry_reader(const Incremental_inputs_reader* inputs,
+ unsigned int offset)
+ : inputs_(inputs), offset_(offset)
+ {
+ this->info_offset_ = Swap32::readval(inputs->p_ + offset + 4);
+ int type = Swap16::readval(this->inputs_->p_ + offset + 20);
+ this->type_ = static_cast<Incremental_input_type>(type);
+ }
+
+ // Return the filename.
+ const char*
+ filename() const
+ {
+ unsigned int offset = Swap32::readval(this->inputs_->p_ + this->offset_);
+ return this->inputs_->get_string(offset);
+ }
+
+ // Return the timestamp.
+ Timespec
+ get_mtime() const
+ {
+ Timespec t;
+ const unsigned char* p = this->inputs_->p_ + this->offset_ + 8;
+ t.seconds = Swap64::readval(p);
+ t.nanoseconds = Swap32::readval(p+8);
+ return t;
+ }
+
+ // Return the type of input file.
+ Incremental_input_type
+ type() const
+ { return this->type_; }
+
+ // Return the input section count -- for objects only.
+ unsigned int
+ get_input_section_count() const
+ {
+ gold_assert(this->type_ == INCREMENTAL_INPUT_OBJECT
+ || this->type_ == INCREMENTAL_INPUT_ARCHIVE_MEMBER);
+ return Swap32::readval(this->inputs_->p_ + this->info_offset_);
+ }
+
+ // Return the offset of the supplemental info for symbol SYMNDX --
+ // for objects only.
+ unsigned int
+ get_symbol_offset(unsigned int symndx) const
+ {
+ gold_assert(this->type_ == INCREMENTAL_INPUT_OBJECT
+ || this->type_ == INCREMENTAL_INPUT_ARCHIVE_MEMBER);
+
+ unsigned int section_count = this->get_input_section_count();
+ return (this->info_offset_ + 8
+ + section_count * input_section_entry_size
+ + symndx * 16);
+ }
+
+ // Return the global symbol count -- for objects & shared libraries only.
+ unsigned int
+ get_global_symbol_count() const
+ {
+ switch (this->type_)
+ {
+ case INCREMENTAL_INPUT_OBJECT:
+ case INCREMENTAL_INPUT_ARCHIVE_MEMBER:
+ return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 4);
+ case INCREMENTAL_INPUT_SHARED_LIBRARY:
+ return Swap32::readval(this->inputs_->p_ + this->info_offset_);
+ default:
+ gold_unreachable();
+ }
+ }
+
+ // Return the member count -- for archives only.
+ unsigned int
+ get_member_count() const
+ {
+ gold_assert(this->type_ == INCREMENTAL_INPUT_ARCHIVE);
+ return Swap32::readval(this->inputs_->p_ + this->info_offset_);
+ }
+
+ // Return the unused symbol count -- for archives only.
+ unsigned int
+ get_unused_symbol_count() const
+ {
+ gold_assert(this->type_ == INCREMENTAL_INPUT_ARCHIVE);
+ return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 4);
+ }
+
+ // Return the input file offset for archive member N -- for archives only.
+ unsigned int
+ get_member_offset(unsigned int n) const
+ {
+ gold_assert(this->type_ == INCREMENTAL_INPUT_ARCHIVE);
+ return Swap32::readval(this->inputs_->p_ + this->info_offset_
+ + 8 + n * 4);
+ }
+
+ // Return the Nth unused global symbol -- for archives only.
+ const char*
+ get_unused_symbol(unsigned int n) const
+ {
+ gold_assert(this->type_ == INCREMENTAL_INPUT_ARCHIVE);
+ unsigned int member_count = this->get_member_count();
+ unsigned int offset = Swap32::readval(this->inputs_->p_
+ + this->info_offset_ + 8
+ + member_count * 4
+ + n * 4);
+ return this->inputs_->get_string(offset);
+ }
+
+ // Information about an input section.
+ struct Input_section_info
+ {
+ const char* name;
+ unsigned int output_shndx;
+ off_t sh_offset;
+ off_t sh_size;
+ };
+
+ // Return info about the Nth input section -- for objects only.
+ Input_section_info
+ get_input_section(unsigned int n) const
+ {
+ Input_section_info info;
+ const unsigned char* p = (this->inputs_->p_
+ + this->info_offset_ + 8
+ + n * input_section_entry_size);
+ unsigned int name_offset = Swap32::readval(p);
+ info.name = this->inputs_->get_string(name_offset);
+ info.output_shndx = Swap32::readval(p + 4);
+ info.sh_offset = Swap::readval(p + 8);
+ info.sh_size = Swap::readval(p + 8 + size / 8);
+ return info;
+ }
+
+ // Information about a global symbol.
+ struct Global_symbol_info
+ {
+ unsigned int output_symndx;
+ unsigned int next_offset;
+ unsigned int reloc_count;
+ unsigned int reloc_offset;
+ };
+
+ // Return info about the Nth global symbol -- for objects only.
+ Global_symbol_info
+ get_global_symbol_info(unsigned int n) const
+ {
+ Global_symbol_info info;
+ unsigned int section_count = this->get_input_section_count();
+ const unsigned char* p = (this->inputs_->p_
+ + this->info_offset_ + 8
+ + section_count * input_section_entry_size
+ + n * 16);
+ info.output_symndx = Swap32::readval(p);
+ info.next_offset = Swap32::readval(p + 4);
+ info.reloc_count = Swap::readval(p + 8);
+ info.reloc_offset = Swap::readval(p + 12);
+ return info;
+ }
+
+ private:
+ // Size of an input section entry.
+ static const unsigned int input_section_entry_size = 8 + 2 * size / 8;
+ // The reader instance for the containing section.
+ const Incremental_inputs_reader* inputs_;
+ // The type of input file.
+ Incremental_input_type type_;
+ // Section offset to the input file entry.
+ unsigned int offset_;
+ // Section offset to the supplemental info for the input file.
+ unsigned int info_offset_;
+ };
+
+ // Return a reader for the Nth input file entry.
+ Incremental_input_entry_reader
+ input_file(unsigned int n) const
+ {
+ gold_assert(n < this->input_file_count_);
+ Incremental_input_entry_reader input(this, 16 + n * 24);
+ return input;
+ }
+
+ private:
+ // Lookup a string in the ELF string table.
+ const char* get_string(unsigned int offset) const
+ {
+ const char* s;
+ if (this->strtab_.get_c_string(offset, &s))
+ return s;
+ return NULL;
+ }
+
+ // Base address of the .gnu_incremental_inputs section.
+ const unsigned char* p_;
+ // The associated ELF string table.
+ elfcpp::Elf_strtab strtab_;
+ // The number of input file entries in this section.
+ unsigned int input_file_count_;
+};
+
+// Reader class for the .gnu_incremental_symtab section.
+
+template<bool big_endian>
+class Incremental_symtab_reader
+{
+ public:
+ Incremental_symtab_reader(const unsigned char* p) : p_(p)
+ { }
+
+ // Return the list head for symbol table entry N.
+ unsigned int get_list_head(unsigned int n) const
+ { return elfcpp::Swap<32, big_endian>::readval(this->p_ + 4 * n); }
+
+ private:
+ // Base address of the .gnu_incremental_relocs section.
+ const unsigned char* p_;
+};
+
+// Reader class for the .gnu_incremental_relocs section.
+
+template<int size, bool big_endian>
+class Incremental_relocs_reader
+{
+ private:
+ // Size of each field.
+ static const unsigned int field_size = size / 8;
+
+ public:
+ typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
+ typedef typename elfcpp::Elf_types<size>::Elf_Swxword Addend;
+
+ // Size of each entry.
+ static const unsigned int reloc_size = 8 + 2 * field_size;
+
+ Incremental_relocs_reader(const unsigned char* p) : p_(p)
+ { }
+
+ // Return the relocation type for relocation entry at offset OFF.
+ unsigned int
+ get_r_type(unsigned int off) const
+ {
+ return elfcpp::Swap<32, big_endian>::readval(this->p_ + off);
+ }
+
+ // Return the output section index for relocation entry at offset OFF.
+ unsigned int
+ get_r_shndx(unsigned int off) const
+ {
+ return elfcpp::Swap<32, big_endian>::readval(this->p_ + off + 4);
+ }
+
+ // Return the output section offset for relocation entry at offset OFF.
+ Address
+ get_r_offset(unsigned int off) const
+ {
+ return elfcpp::Swap<size, big_endian>::readval(this->p_ + off + 8);
+ }
+
+ // Return the addend for relocation entry at offset OFF.
+ Addend
+ get_r_addend(unsigned int off) const
+ {
+ return elfcpp::Swap<size, big_endian>::readval(this->p_ + off + 8
+ + this->field_size);
+ }
+
+ private:
+ // Base address of the .gnu_incremental_relocs section.
+ const unsigned char* p_;
+};
+
+// Reader class for the .gnu_incremental_got_plt section.
+
+template<bool big_endian>
+class Incremental_got_plt_reader
+{
+ public:
+ Incremental_got_plt_reader(const unsigned char* p) : p_(p)
+ {
+ this->got_count_ = elfcpp::Swap<32, big_endian>::readval(p);
+ this->got_desc_p_ = p + 8 + ((this->got_count_ + 3) & ~3);
+ this->plt_desc_p_ = this->got_desc_p_ + this->got_count_ * 4;
+ }
+
+ // Return the GOT entry count.
+ unsigned int
+ get_got_entry_count() const
+ {
+ return this->got_count_;
+ }
+
+ // Return the PLT entry count.
+ unsigned int
+ get_plt_entry_count() const
+ {
+ return elfcpp::Swap<32, big_endian>::readval(this->p_ + 4);
+ }
+
+ // Return the GOT type for GOT entry N.
+ unsigned int
+ get_got_type(unsigned int n)
+ {
+ return this->p_[8 + n];
+ }
+
+ // Return the GOT descriptor for GOT entry N.
+ unsigned int
+ get_got_desc(unsigned int n)
+ {
+ return elfcpp::Swap<32, big_endian>::readval(this->got_desc_p_ + n * 4);
+ }
+
+ // Return the PLT descriptor for PLT entry N.
+ unsigned int
+ get_plt_desc(unsigned int n)
+ {
+ return elfcpp::Swap<32, big_endian>::readval(this->plt_desc_p_ + n * 4);
+ }
+
+ private:
+ // Base address of the .gnu_incremental_got_plt section.
+ const unsigned char* p_;
+ // GOT entry count.
+ unsigned int got_count_;
+ // Base address of the GOT descriptor array.
+ const unsigned char* got_desc_p_;
+ // Base address of the PLT descriptor array.
+ const unsigned char* plt_desc_p_;
};
} // End namespace gold.
projects / deliverable / binutils-gdb.git / blobdiff