gold/readsyms.h

   1 // readsyms.h -- read input file symbols for gold   -*- C++ -*-
   2
   3 #ifndef GOLD_READSYMS_H
   4 #define GOLD_READSYMS_H
   5
   6 #include <vector>
   7
   8 #include "workqueue.h"
   9 #include "object.h"
  10
  11 namespace gold
  12 {
  13
  14 class Input_objects;
  15 class Symbol_table;
  16 class Input_group;
  17 class Archive;
  18
  19 // This Task is responsible for reading the symbols from an input
  20 // file.  This also includes reading the relocations so that we can
  21 // check for any that require a PLT and/or a GOT.  After the data has
  22 // been read, this queues up another task to actually add the symbols
  23 // to the symbol table.  The tasks are separated because the file
  24 // reading can occur in parallel but adding the symbols must be done
  25 // in the order of the input files.
  26
  27 class Read_symbols : public Task
  28 {
  29  public:
  30   // DIRPATH is the list of directories to search for libraries.
  31   // INPUT is the file to read.  INPUT_GROUP is not NULL if we are in
  32   // the middle of an input group.  THIS_BLOCKER is used to prevent
  33   // the associated Add_symbols task from running before the previous
  34   // one has completed; it will be NULL for the first task.
  35   // NEXT_BLOCKER is used to block the next input file from adding
  36   // symbols.
  37   Read_symbols(const General_options& options, Input_objects* input_objects,
  38                Symbol_table* symtab, Layout* layout, const Dirsearch& dirpath,
  39                const Input_argument* input_argument, Input_group* input_group,
  40                Task_token* this_blocker, Task_token* next_blocker)
  41     : options_(options), input_objects_(input_objects), symtab_(symtab),
  42       layout_(layout), dirpath_(dirpath), input_argument_(input_argument),
  43       input_group_(input_group), this_blocker_(this_blocker),
  44       next_blocker_(next_blocker)
  45   { }
  46
  47   ~Read_symbols();
  48
  49   // The standard Task methods.
  50
  51   Is_runnable_type
  52   is_runnable(Workqueue*);
  53
  54   Task_locker*
  55   locks(Workqueue*);
  56
  57   void
  58   run(Workqueue*);
  59
  60  private:
  61   // Handle an archive group.
  62   void
  63   do_group(Workqueue*);
  64
  65   const General_options& options_;
  66   Input_objects* input_objects_;
  67   Symbol_table* symtab_;
  68   Layout* layout_;
  69   const Dirsearch& dirpath_;
  70   const Input_argument* input_argument_;
  71   Input_group* input_group_;
  72   Task_token* this_blocker_;
  73   Task_token* next_blocker_;
  74 };
  75
  76 // This Task handles adding the symbols to the symbol table.  These
  77 // tasks must be run in the same order as the arguments appear on the
  78 // command line.
  79
  80 class Add_symbols : public Task
  81 {
  82  public:
  83   // THIS_BLOCKER is used to prevent this task from running before the
  84   // one for the previous input file.  NEXT_BLOCKER is used to prevent
  85   // the next task from running.
  86   Add_symbols(const General_options& options, Input_objects* input_objects,
  87               Symbol_table* symtab, Layout* layout, Object* object,
  88               Read_symbols_data* sd, Task_token* this_blocker,
  89               Task_token* next_blocker)
  90     : options_(options), input_objects_(input_objects), symtab_(symtab),
  91       layout_(layout), object_(object), sd_(sd), this_blocker_(this_blocker),
  92       next_blocker_(next_blocker)
  93   { }
  94
  95   ~Add_symbols();
  96
  97   // The standard Task methods.
  98
  99   Is_runnable_type
 100   is_runnable(Workqueue*);
 101
 102   Task_locker*
 103   locks(Workqueue*);
 104
 105   void
 106   run(Workqueue*);
 107
 108 private:
 109   class Add_symbols_locker;
 110
 111   const General_options& options_;
 112   Input_objects* input_objects_;
 113   Symbol_table* symtab_;
 114   Layout* layout_;
 115   Object* object_;
 116   Read_symbols_data* sd_;
 117   Task_token* this_blocker_;
 118   Task_token* next_blocker_;
 119 };
 120
 121 // This class is used to track the archives in a group.
 122
 123 class Input_group
 124 {
 125  public:
 126   typedef std::vector<Archive*> Archives;
 127   typedef Archives::const_iterator const_iterator;
 128
 129   Input_group()
 130     : archives_()
 131   { }
 132
 133   // Add an archive to the group.
 134   void
 135   add_archive(Archive* arch)
 136   { this->archives_.push_back(arch); }
 137
 138   // Loop over the archives in the group.
 139
 140   const_iterator
 141   begin() const
 142   { return this->archives_.begin(); }
 143
 144   const_iterator
 145   end() const
 146   { return this->archives_.end(); }
 147
 148  private:
 149   Archives archives_;
 150 };
 151
 152 // This class is used to finish up handling a group.  It is just a
 153 // closure.
 154
 155 class Finish_group : public Task
 156 {
 157  public:
 158   Finish_group(const General_options& options, Input_objects* input_objects,
 159                Symbol_table* symtab, Layout* layout, Input_group* input_group,
 160                int saw_undefined, Task_token* this_blocker,
 161                Task_token* next_blocker)
 162     : options_(options), input_objects_(input_objects), symtab_(symtab),
 163       layout_(layout), input_group_(input_group),
 164       saw_undefined_(saw_undefined), this_blocker_(this_blocker),
 165       next_blocker_(next_blocker)
 166   { }
 167
 168   ~Finish_group();
 169
 170   // The standard Task methods.
 171
 172   Is_runnable_type
 173   is_runnable(Workqueue*);
 174
 175   Task_locker*
 176   locks(Workqueue*);
 177
 178   void
 179   run(Workqueue*);
 180
 181  private:
 182   const General_options& options_;
 183   Input_objects* input_objects_;
 184   Symbol_table* symtab_;
 185   Layout* layout_;
 186   Input_group* input_group_;
 187   int saw_undefined_;
 188   Task_token* this_blocker_;
 189   Task_token* next_blocker_;
 190 };
 191
 192 } // end namespace gold
 193
 194 #endif // !defined(GOLD_READSYMS_H)