gold/stringpool.h

   1 // stringpool.h -- a string pool for gold    -*- C++ -*-
   2
   3 #include <string>
   4 #include <list>
   5
   6 // Stringpool
   7 //   Manage a pool of unique strings.
   8
   9 #ifndef GOLD_STRINGPOOL_H
  10 #define GOLD_STRINGPOOL_H
  11
  12 namespace gold
  13 {
  14
  15 class Stringpool
  16 {
  17  public:
  18   Stringpool();
  19
  20   ~Stringpool();
  21
  22   // Add a string to the pool.  This returns a canonical permanent
  23   // pointer to the string.
  24   const char* add(const char*);
  25
  26   const char* add(const std::string& s)
  27   { return this->add(s.c_str()); }
  28
  29   // Add the prefix of a string to the pool.
  30   const char* add(const char *, size_t);
  31
  32  private:
  33   Stringpool(const Stringpool&);
  34   Stringpool& operator=(const Stringpool&);
  35
  36   struct stringdata
  37   {
  38     // Length of data in buffer.
  39     size_t len;
  40     // Allocated size of buffer.
  41     size_t alc;
  42     // Buffer.
  43     char data[1];
  44   };
  45
  46   const char* add_string(const char*);
  47
  48   struct Stringpool_hash
  49   {
  50     size_t
  51     operator()(const char*) const;
  52   };
  53
  54   struct Stringpool_eq
  55   {
  56     bool
  57     operator()(const char* p1, const char* p2) const
  58     { return strcmp(p1, p2) == 0; }
  59   };
  60
  61 #ifdef HAVE_TR1_UNORDERED_SET
  62   typedef Unordered_set<const char*, Stringpool_hash, Stringpool_eq,
  63                         std::allocator<const char*>,
  64                         true> String_set_type;
  65 #else
  66   typedef Unordered_set<const char*, Stringpool_hash, Stringpool_eq,
  67                         std::allocator<const char*> > String_set_type;
  68 #endif
  69
  70   String_set_type string_set_;
  71   std::list<stringdata*> strings_;
  72 };
  73
  74 } // End namespace gold.
  75
  76 #endif // !defined(GOLD_STRINGPOOL_H)