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, const 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   Is_runnable_type
  72   is_runnable(Workqueue*);
  73
  74   Task_locker*
  75   locks(Workqueue*);
  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   const 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   Is_runnable_type
 127   is_runnable(Workqueue*);
 128
 129   Task_locker*
 130   locks(Workqueue*);
 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   class Add_symbols_locker;
 141
 142   Input_objects* input_objects_;
 143   Symbol_table* symtab_;
 144   Layout* layout_;
 145   Object* object_;
 146   Read_symbols_data* sd_;
 147   Task_token* this_blocker_;
 148   Task_token* next_blocker_;
 149 };
 150
 151 // This class is used to track the archives in a group.
 152
 153 class Input_group
 154 {
 155  public:
 156   typedef std::vector<Archive*> Archives;
 157   typedef Archives::const_iterator const_iterator;
 158
 159   Input_group()
 160     : archives_()
 161   { }
 162
 163   // Add an archive to the group.
 164   void
 165   add_archive(Archive* arch)
 166   { this->archives_.push_back(arch); }
 167
 168   // Loop over the archives in the group.
 169
 170   const_iterator
 171   begin() const
 172   { return this->archives_.begin(); }
 173
 174   const_iterator
 175   end() const
 176   { return this->archives_.end(); }
 177
 178  private:
 179   Archives archives_;
 180 };
 181
 182 // This class is used to finish up handling a group.  It is just a
 183 // closure.
 184
 185 class Finish_group : public Task
 186 {
 187  public:
 188   Finish_group(Input_objects* input_objects, Symbol_table* symtab,
 189                Layout* layout, Input_group* input_group,
 190                int saw_undefined, Task_token* this_blocker,
 191                Task_token* next_blocker)
 192     : input_objects_(input_objects), symtab_(symtab),
 193       layout_(layout), input_group_(input_group),
 194       saw_undefined_(saw_undefined), this_blocker_(this_blocker),
 195       next_blocker_(next_blocker)
 196   { }
 197
 198   ~Finish_group();
 199
 200   // The standard Task methods.
 201
 202   Is_runnable_type
 203   is_runnable(Workqueue*);
 204
 205   Task_locker*
 206   locks(Workqueue*);
 207
 208   void
 209   run(Workqueue*);
 210
 211   std::string
 212   get_name() const
 213   { return "Finish_group"; }
 214
 215  private:
 216   Input_objects* input_objects_;
 217   Symbol_table* symtab_;
 218   Layout* layout_;
 219   Input_group* input_group_;
 220   int saw_undefined_;
 221   Task_token* this_blocker_;
 222   Task_token* next_blocker_;
 223 };
 224
 225 } // end namespace gold
 226
 227 #endif // !defined(GOLD_READSYMS_H)