gold/readsyms.h

   1 // readsyms.h -- read input file symbols for gold   -*- C++ -*-
   2
   3 // Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
   4 // Written by Ian Lance Taylor <iant@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 #ifndef GOLD_READSYMS_H
  24 #define GOLD_READSYMS_H
  25
  26 #include <vector>
  27
  28 #include "workqueue.h"
  29 #include "object.h"
  30
  31 namespace gold
  32 {
  33
  34 class Input_objects;
  35 class Symbol_table;
  36 class Input_group;
  37 class Archive;
  38
  39 // This Task is responsible for reading the symbols from an input
  40 // file.  This also includes reading the relocations so that we can
  41 // check for any that require a PLT and/or a GOT.  After the data has
  42 // been read, this queues up another task to actually add the symbols
  43 // to the symbol table.  The tasks are separated because the file
  44 // reading can occur in parallel but adding the symbols must be done
  45 // in the order of the input files.
  46
  47 class Read_symbols : public Task
  48 {
  49  public:
  50   // DIRPATH is the list of directories to search for libraries.
  51   // INPUT is the file to read.  INPUT_GROUP is not NULL if we are in
  52   // the middle of an input group.  THIS_BLOCKER is used to prevent
  53   // the associated Add_symbols task from running before the previous
  54   // one has completed; it will be NULL for the first task.
  55   // NEXT_BLOCKER is used to block the next input file from adding
  56   // symbols.
  57   Read_symbols(Input_objects* input_objects, Symbol_table* symtab,
  58                Layout* layout, Dirsearch* dirpath, Mapfile* mapfile,
  59                const Input_argument* input_argument,
  60                Input_group* input_group, Task_token* this_blocker,
  61                Task_token* next_blocker)
  62     : input_objects_(input_objects), symtab_(symtab), layout_(layout),
  63       dirpath_(dirpath), mapfile_(mapfile), input_argument_(input_argument),
  64       input_group_(input_group), this_blocker_(this_blocker),
  65       next_blocker_(next_blocker)
  66   { }
  67
  68   ~Read_symbols();
  69
  70   // The standard Task methods.
  71
  72   Task_token*
  73   is_runnable();
  74
  75   void
  76   locks(Task_locker*);
  77
  78   void
  79   run(Workqueue*);
  80
  81   std::string
  82   get_name() const;
  83
  84  private:
  85   // Handle an archive group.
  86   void
  87   do_group(Workqueue*);
  88
  89   // Open and identify the file.
  90   bool
  91   do_read_symbols(Workqueue*);
  92
  93   Input_objects* input_objects_;
  94   Symbol_table* symtab_;
  95   Layout* layout_;
  96   Dirsearch* dirpath_;
  97   Mapfile* mapfile_;
  98   const Input_argument* input_argument_;
  99   Input_group* input_group_;
 100   Task_token* this_blocker_;
 101   Task_token* next_blocker_;
 102 };
 103
 104 // This Task handles adding the symbols to the symbol table.  These
 105 // tasks must be run in the same order as the arguments appear on the
 106 // command line.
 107
 108 class Add_symbols : public Task
 109 {
 110  public:
 111   // THIS_BLOCKER is used to prevent this task from running before the
 112   // one for the previous input file.  NEXT_BLOCKER is used to prevent
 113   // the next task from running.
 114   Add_symbols(Input_objects* input_objects, Symbol_table* symtab,
 115               Layout* layout, Object* object,
 116               Read_symbols_data* sd, Task_token* this_blocker,
 117               Task_token* next_blocker)
 118     : input_objects_(input_objects), symtab_(symtab), layout_(layout),
 119       object_(object), sd_(sd), this_blocker_(this_blocker),
 120       next_blocker_(next_blocker)
 121   { }
 122
 123   ~Add_symbols();
 124
 125   // The standard Task methods.
 126
 127   Task_token*
 128   is_runnable();
 129
 130   void
 131   locks(Task_locker*);
 132
 133   void
 134   run(Workqueue*);
 135
 136   std::string
 137   get_name() const
 138   { return "Add_symbols " + this->object_->name(); }
 139
 140 private:
 141   Input_objects* input_objects_;
 142   Symbol_table* symtab_;
 143   Layout* layout_;
 144   Object* object_;
 145   Read_symbols_data* sd_;
 146   Task_token* this_blocker_;
 147   Task_token* next_blocker_;
 148 };
 149
 150 // This class is used to track the archives in a group.
 151
 152 class Input_group
 153 {
 154  public:
 155   typedef std::vector<Archive*> Archives;
 156   typedef Archives::const_iterator const_iterator;
 157
 158   Input_group()
 159     : archives_()
 160   { }
 161
 162   // Add an archive to the group.
 163   void
 164   add_archive(Archive* arch)
 165   { this->archives_.push_back(arch); }
 166
 167   // Loop over the archives in the group.
 168
 169   const_iterator
 170   begin() const
 171   { return this->archives_.begin(); }
 172
 173   const_iterator
 174   end() const
 175   { return this->archives_.end(); }
 176
 177  private:
 178   Archives archives_;
 179 };
 180
 181 // This class is used to finish up handling a group.  It is just a
 182 // closure.
 183
 184 class Finish_group : public Task
 185 {
 186  public:
 187   Finish_group(Input_objects* input_objects, Symbol_table* symtab,
 188                Layout* layout, Mapfile* mapfile, Input_group* input_group,
 189                int saw_undefined, Task_token* this_blocker,
 190                Task_token* next_blocker)
 191     : input_objects_(input_objects), symtab_(symtab),
 192       layout_(layout), mapfile_(mapfile), input_group_(input_group),
 193       saw_undefined_(saw_undefined), this_blocker_(this_blocker),
 194       next_blocker_(next_blocker)
 195   { }
 196
 197   ~Finish_group();
 198
 199   // The standard Task methods.
 200
 201   Task_token*
 202   is_runnable();
 203
 204   void
 205   locks(Task_locker*);
 206
 207   void
 208   run(Workqueue*);
 209
 210   std::string
 211   get_name() const
 212   { return "Finish_group"; }
 213
 214  private:
 215   Input_objects* input_objects_;
 216   Symbol_table* symtab_;
 217   Layout* layout_;
 218   Mapfile* mapfile_;
 219   Input_group* input_group_;
 220   int saw_undefined_;
 221   Task_token* this_blocker_;
 222   Task_token* next_blocker_;
 223 };
 224
 225 // This class is used to read a file which was not recognized as an
 226 // object or archive.  It tries to read it as a linker script, using
 227 // the tokens to serialize with the calls to Add_symbols.
 228
 229 class Read_script : public Task
 230 {
 231  public:
 232   Read_script(Symbol_table* symtab, Layout* layout, Dirsearch* dirpath,
 233               Input_objects* input_objects, Mapfile* mapfile,
 234               Input_group* input_group, const Input_argument* input_argument,
 235               Input_file* input_file, Task_token* this_blocker,
 236               Task_token* next_blocker)
 237     : symtab_(symtab), layout_(layout), dirpath_(dirpath),
 238       input_objects_(input_objects), mapfile_(mapfile),
 239       input_group_(input_group), input_argument_(input_argument),
 240       input_file_(input_file), this_blocker_(this_blocker),
 241       next_blocker_(next_blocker)
 242   { }
 243
 244   ~Read_script();
 245
 246   // The standard Task methods.
 247
 248   Task_token*
 249   is_runnable();
 250
 251   void
 252   locks(Task_locker*);
 253
 254   void
 255   run(Workqueue*);
 256
 257   std::string
 258   get_name() const;
 259
 260  private:
 261   Symbol_table* symtab_;
 262   Layout* layout_;
 263   Dirsearch* dirpath_;
 264   Input_objects* input_objects_;
 265   Mapfile* mapfile_;
 266   Input_group* input_group_;
 267   const Input_argument* input_argument_;
 268   Input_file* input_file_;
 269   Task_token* this_blocker_;
 270   Task_token* next_blocker_;
 271 };
 272
 273 } // end namespace gold
 274
 275 #endif // !defined(GOLD_READSYMS_H)