From b8e6aad9606384125f588d531c567f49bad346e2 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@google.com>
Date: Wed, 16 May 2007 17:42:48 +0000
Subject: Add support for SHF_MERGE sections.

---
 gold/stringpool.h | 71 +++++++++++++++++++++++++++++++++----------------------
 1 file changed, 43 insertions(+), 28 deletions(-)

(limited to 'gold/stringpool.h')

diff --git a/gold/stringpool.h b/gold/stringpool.h
index 05c498e..b9a65f6 100644
--- a/gold/stringpool.h
+++ b/gold/stringpool.h
@@ -14,7 +14,8 @@ namespace gold
 
 class Output_file;
 
-class Stringpool
+template<typename Stringpool_char>
+class Stringpool_template
 {
  public:
   // The type of a key into the stringpool.  A key value will always
@@ -24,43 +25,47 @@ class Stringpool
   // into an unordered hash table.  Zero is never a valid key.
   typedef size_t Key;
 
-  Stringpool();
+  // Create a Stringpool.  ZERO_NULL is true if we should reserve
+  // offset 0 to hold the empty string.
+  Stringpool_template(bool zero_null = true);
 
-  ~Stringpool();
+  ~Stringpool_template();
 
   // Add a string to the pool.  This returns a canonical permanent
   // pointer to the string.  If PKEY is not NULL, this sets *PKEY to
   // the key for the string.
-  const char*
-  add(const char*, Key* pkey);
+  const Stringpool_char*
+  add(const Stringpool_char*, Key* pkey);
 
-  const char*
-  add(const std::string& s, Key* pkey)
+  const Stringpool_char*
+  add(const std::basic_string<Stringpool_char>& s, Key* pkey)
   { return this->add(s.c_str(), pkey); }
 
   // Add the prefix of a string to the pool.
-  const char*
-  add(const char *, size_t, Key* pkey);
+  const Stringpool_char*
+  add(const Stringpool_char*, size_t, Key* pkey);
 
   // If a string is present, return the canonical string.  Otherwise,
   // return NULL.  If PKEY is not NULL, set *PKEY to the key.
-  const char*
-  find(const char*, Key* pkey) const;
+  const Stringpool_char*
+  find(const Stringpool_char*, Key* pkey) const;
 
   // Turn the stringpool into an ELF strtab: determine the offsets of
   // all the strings.
   void
   set_string_offsets();
 
-  // Get the offset of a string in an ELF strtab.
+  // Get the offset of a string in an ELF strtab.  This returns the
+  // offset in bytes, not characters.
   off_t
-  get_offset(const char*) const;
+  get_offset(const Stringpool_char*) const;
 
   off_t
-  get_offset(const std::string& s) const
+  get_offset(const std::basic_string<Stringpool_char>& s) const
   { return this->get_offset(s.c_str()); }
 
-  // Get the size of the ELF strtab.
+  // Get the size of the ELF strtab.  This returns the number of
+  // bytes, not characters.
   off_t
   get_strtab_size() const
   {
@@ -73,8 +78,12 @@ class Stringpool
   write(Output_file*, off_t offset);
 
  private:
-  Stringpool(const Stringpool&);
-  Stringpool& operator=(const Stringpool&);
+  Stringpool_template(const Stringpool_template&);
+  Stringpool_template& operator=(const Stringpool_template&);
+
+  // Return the length of a string.
+  static size_t
+  string_length(const Stringpool_char*);
 
   // We store the actual data in a list of these buffers.
   struct Stringdata
@@ -90,24 +99,24 @@ class Stringpool
   };
 
   // Copy a string into the buffers, returning a canonical string.
-  const char*
-  add_string(const char*, Key*);
+  const Stringpool_char*
+  add_string(const Stringpool_char*, Key*);
 
   struct Stringpool_hash
   {
     size_t
-    operator()(const char*) const;
+    operator()(const Stringpool_char*) const;
   };
 
   struct Stringpool_eq
   {
     bool
-    operator()(const char* p1, const char* p2) const
-    { return strcmp(p1, p2) == 0; }
+    operator()(const Stringpool_char* p1, const Stringpool_char* p2) const;
   };
 
   // Return whether s1 is a suffix of s2.
-  static bool is_suffix(const char* s1, const char* s2);
+  static bool
+  is_suffix(const Stringpool_char* s1, const Stringpool_char* s2);
 
   // The hash table is a map from string names to a pair of Key and
   // ELF strtab offsets.  We only use the offsets if we turn this into
@@ -116,12 +125,13 @@ class Stringpool
   typedef std::pair<Key, off_t> Val;
 
 #ifdef HAVE_TR1_UNORDERED_SET
-  typedef Unordered_map<const char*, Val, Stringpool_hash,
+  typedef Unordered_map<const Stringpool_char*, Val, Stringpool_hash,
 			Stringpool_eq,
-			std::allocator<std::pair<const char* const, Val> >,
+			std::allocator<std::pair<const Stringpool_char* const,
+						 Val> >,
 			true> String_set_type;
 #else
-  typedef Unordered_map<const char*, Val, Stringpool_hash,
+  typedef Unordered_map<const Stringpool_char*, Val, Stringpool_hash,
 			Stringpool_eq> String_set_type;
 #endif
 
@@ -130,8 +140,8 @@ class Stringpool
   struct Stringpool_sort_comparison
   {
     bool
-    operator()(String_set_type::iterator,
-	       String_set_type::iterator) const;
+    operator()(typename String_set_type::iterator,
+	       typename String_set_type::iterator) const;
   };
 
   // List of Stringdata structures.
@@ -145,8 +155,13 @@ class Stringpool
   off_t strtab_size_;
   // Next Stringdata index.
   unsigned int next_index_;
+  // Whether to reserve offset 0 to hold the null string.
+  bool zero_null_;
 };
 
+// The most common type of Stringpool.
+typedef Stringpool_template<char> Stringpool;
+
 } // End namespace gold.
 
 #endif // !defined(GOLD_STRINGPOOL_H)
-- 
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