gold/incremental.cc

   1 // inremental.cc -- incremental linking support for gold
   2
   3 // Copyright 2009 Free Software Foundation, Inc.
   4 // Written by Mikolaj Zalewski <mikolajz@google.com>.
   5
   6 // This file is part of gold.
   7
   8 // This program is free software; you can redistribute it and/or modify
   9 // it under the terms of the GNU General Public License as published by
  10 // the Free Software Foundation; either version 3 of the License, or
  11 // (at your option) any later version.
  12
  13 // This program is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License
  19 // along with this program; if not, write to the Free Software
  20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21 // MA 02110-1301, USA.
  22
  23 #include "gold.h"
  24 #include "elfcpp.h"
  25
  26 using elfcpp::Convert;
  27
  28 namespace gold {
  29
  30 // Version information. Will change frequently during the development, later
  31 // we could think about backward (and forward?) compatibility.
  32 const int INCREMENTAL_LINK_VERSION = 1;
  33
  34 namespace internal {
  35
  36 // Header of the .gnu_incremental_input section.
  37 struct Incremental_input_header_data
  38 {
  39   // Incremental linker version.
  40   elfcpp::Elf_Word version;
  41
  42   // Numer of input files in the link.
  43   elfcpp::Elf_Word input_file_count;
  44
  45   // Offset of command line options in .gnu_incremental_strtab.
  46   elfcpp::Elf_Word command_line_offset;
  47
  48   // Padding.
  49   elfcpp::Elf_Word reserved;
  50 };
  51
  52 // Data stored in .gnu_incremental_input after the header for each of the
  53 // Incremental_input_header_data::input_file_count input entries.
  54 struct Incremental_input_entry_data
  55 {
  56   // Offset of file name in .gnu_incremental_strtab section.
  57   elfcpp::Elf_Word filename_offset;
  58
  59   // Offset of data in .gnu_incremental_input.
  60   elfcpp::Elf_Word data_offset;
  61
  62   // Timestamp (in seconds).
  63   elfcpp::Elf_Xword timestamp_sec;
  64
  65   // Nano-second part of timestamp (if supported).
  66   elfcpp::Elf_Word timestamp_usec;
  67
  68   // Type of the input entry.
  69   elfcpp::Elf_Half input_type;
  70
  71   // Padding.
  72   elfcpp::Elf_Half reserved;
  73 };
  74
  75 }
  76
  77 // Accessors.
  78
  79 // See internal::Incremental_input_header for fields descriptions.
  80 template<int size, bool big_endian>
  81 class Incremental_input_header_write
  82 {
  83  public:
  84   Incremental_input_header_write(unsigned char *p)
  85     : p_(reinterpret_cast<internal::Incremental_input_header_data>(p))
  86   { }
  87
  88   void
  89   put_version(elfcpp::Elf_Word v)
  90   { this->p_->version = Convert<32, big_endian>::convert_host(v); }
  91
  92   void
  93   input_file_count(elfcpp::Elf_Word v)
  94   { this->p_->input_file_count = Convert<32, big_endian>::convert_host(v); }
  95
  96   void
  97   command_line_offset(elfcpp::Elf_Word v)
  98   { this->p_->command_line_offset = Convert<32, big_endian>::convert_host(v); }
  99
 100   void
 101   reserved(elfcpp::Elf_Word v)
 102   { this->p_->reserved = Convert<32, big_endian>::convert_host(v); }
 103
 104  private:
 105   internal::Incremental_input_header_data* p_;
 106 };
 107
 108 // See internal::Incremental_input_entry for fields descriptions.
 109 template<int size, bool big_endian>
 110 class Incremental_input_entry_write
 111 {
 112  public:
 113   Incremental_input_entry_write(unsigned char *p)
 114     : p_(reinterpret_cast<internal::Incremental_input_entry_data>(p))
 115   { }
 116
 117   void
 118   put_filename_offset(elfcpp::Elf_Word v)
 119   { this->p_->filename_offset = Convert<32, big_endian>::convert_host(v); }
 120
 121   void
 122   put_data_offset(elfcpp::Elf_Word v)
 123   { this->p_->data_offset = Convert<32, big_endian>::convert_host(v); }
 124
 125   void
 126   put_timestamp_sec(elfcpp::Elf_Word v)
 127   { this->p_->timestamp_sec = Convert<32, big_endian>::convert_host(v); }
 128
 129   void
 130   put_timestamp_usec(elfcpp::Elf_Word v)
 131   { this->p_->timestamp_usec = Convert<32, big_endian>::convert_host(v); }
 132
 133   void
 134   put_input_type(elfcpp::Elf_Word v)
 135   { this->p_->input_type = Convert<32, big_endian>::convert_host(v); }
 136
 137   void
 138   put_reserved(elfcpp::Elf_Word v)
 139   { this->p_->reserved = Convert<32, big_endian>::convert_host(v); }
 140
 141  private:
 142   internal::Incremental_input_entry_data* p_;
 143 };
 144
 145 } // End namespace gold.