gold/readsyms.h

   1 // readsyms.h -- read input file symbols for gold   -*- C++ -*-
   2
   3 // Copyright 2006, 2007 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(const General_options& options, Input_objects* input_objects,
  58                Symbol_table* symtab, Layout* layout, Dirsearch* dirpath,
  59                const Input_argument* input_argument, Input_group* input_group,
  60                Task_token* this_blocker, Task_token* next_blocker)
  61     : options_(options), input_objects_(input_objects), symtab_(symtab),
  62       layout_(layout), dirpath_(dirpath), input_argument_(input_argument),
  63       input_group_(input_group), this_blocker_(this_blocker),
  64       next_blocker_(next_blocker)
  65   { }
  66
  67   ~Read_symbols();
  68
  69   // The standard Task methods.
  70
  71   Task_token*
  72   is_runnable();
  73
  74   void
  75   locks(Task_locker*);
  76
  77   void
  78   run(Workqueue*);
  79
  80   std::string
  81   get_name() const;
  82
  83  private:
  84   // Handle an archive group.
  85   void
  86   do_group(Workqueue*);
  87
  88   // Open and identify the file.
  89   bool
  90   do_read_symbols(Workqueue*);
  91
  92   const General_options& options_;
  93   Input_objects* input_objects_;
  94   Symbol_table* symtab_;
  95   Layout* layout_;
  96   Dirsearch* dirpath_;
  97   const Input_argument* input_argument_;
  98   Input_group* input_group_;
  99   Task_token* this_blocker_;
 100   Task_token* next_blocker_;
 101 };
 102
 103 // This Task handles adding the symbols to the symbol table.  These
 104 // tasks must be run in the same order as the arguments appear on the
 105 // command line.
 106
 107 class Add_symbols : public Task
 108 {
 109  public:
 110   // THIS_BLOCKER is used to prevent this task from running before the
 111   // one for the previous input file.  NEXT_BLOCKER is used to prevent
 112   // the next task from running.
 113   Add_symbols(Input_objects* input_objects, Symbol_table* symtab,
 114               Layout* layout, Object* object,
 115               Read_symbols_data* sd, Task_token* this_blocker,
 116               Task_token* next_blocker)
 117     : input_objects_(input_objects), symtab_(symtab), layout_(layout),
 118       object_(object), sd_(sd), this_blocker_(this_blocker),
 119       next_blocker_(next_blocker)
 120   { }
 121
 122   ~Add_symbols();
 123
 124   // The standard Task methods.
 125
 126   Task_token*
 127   is_runnable();
 128
 129   void
 130   locks(Task_locker*);
 131
 132   void
 133   run(Workqueue*);
 134
 135   std::string
 136   get_name() const
 137   { return "Add_symbols " + this->object_->name(); }
 138
 139 private:
 140   Input_objects* input_objects_;
 141   Symbol_table* symtab_;
 142   Layout* layout_;
 143   Object* object_;
 144   Read_symbols_data* sd_;
 145   Task_token* this_blocker_;
 146   Task_token* next_blocker_;
 147 };
 148
 149 // This class is used to track the archives in a group.
 150
 151 class Input_group
 152 {
 153  public:
 154   typedef std::vector<Archive*> Archives;
 155   typedef Archives::const_iterator const_iterator;
 156
 157   Input_group()
 158     : archives_()
 159   { }
 160
 161   // Add an archive to the group.
 162   void
 163   add_archive(Archive* arch)
 164   { this->archives_.push_back(arch); }
 165
 166   // Loop over the archives in the group.
 167
 168   const_iterator
 169   begin() const
 170   { return this->archives_.begin(); }
 171
 172   const_iterator
 173   end() const
 174   { return this->archives_.end(); }
 175
 176  private:
 177   Archives archives_;
 178 };
 179
 180 // This class is used to finish up handling a group.  It is just a
 181 // closure.
 182
 183 class Finish_group : public Task
 184 {
 185  public:
 186   Finish_group(Input_objects* input_objects, Symbol_table* symtab,
 187                Layout* layout, Input_group* input_group,
 188                int saw_undefined, Task_token* this_blocker,
 189                Task_token* next_blocker)
 190     : input_objects_(input_objects), symtab_(symtab),
 191       layout_(layout), input_group_(input_group),
 192       saw_undefined_(saw_undefined), this_blocker_(this_blocker),
 193       next_blocker_(next_blocker)
 194   { }
 195
 196   ~Finish_group();
 197
 198   // The standard Task methods.
 199
 200   Task_token*
 201   is_runnable();
 202
 203   void
 204   locks(Task_locker*);
 205
 206   void
 207   run(Workqueue*);
 208
 209   std::string
 210   get_name() const
 211   { return "Finish_group"; }
 212
 213  private:
 214   Input_objects* input_objects_;
 215   Symbol_table* symtab_;
 216   Layout* layout_;
 217   Input_group* input_group_;
 218   int saw_undefined_;
 219   Task_token* this_blocker_;
 220   Task_token* next_blocker_;
 221 };
 222
 223 // This class is used to read a file which was not recognized as an
 224 // object or archive.  It tries to read it as a linker script, using
 225 // the tokens to serialize with the calls to Add_symbols.
 226
 227 class Read_script : public Task
 228 {
 229  public:
 230   Read_script(const General_options& options, Symbol_table* symtab,
 231               Layout* layout, Dirsearch* dirpath, Input_objects* input_objects,
 232               Input_group* input_group, const Input_argument* input_argument,
 233               Input_file* input_file, Task_token* this_blocker,
 234               Task_token* next_blocker)
 235     : options_(options), symtab_(symtab), layout_(layout), dirpath_(dirpath),
 236       input_objects_(input_objects), input_group_(input_group),
 237       input_argument_(input_argument), input_file_(input_file),
 238       this_blocker_(this_blocker), next_blocker_(next_blocker)
 239   { }
 240
 241   ~Read_script();
 242
 243   // The standard Task methods.
 244
 245   Task_token*
 246   is_runnable();
 247
 248   void
 249   locks(Task_locker*);
 250
 251   void
 252   run(Workqueue*);
 253
 254   std::string
 255   get_name() const;
 256
 257  private:
 258   const General_options& options_;
 259   Symbol_table* symtab_;
 260   Layout* layout_;
 261   Dirsearch* dirpath_;
 262   Input_objects* input_objects_;
 263   Input_group* input_group_;
 264   const Input_argument* input_argument_;
 265   Input_file* input_file_;
 266   Task_token* this_blocker_;
 267   Task_token* next_blocker_;
 268 };
 269
 270 } // end namespace gold
 271
 272 #endif // !defined(GOLD_READSYMS_H)