* defs.h (streq): Add prototype.

* utils.c (streq): New function.

	* dwarf2read.c (new_symbol): Use SYMBOL_SET_NAMES instead of
	SYMBOL_NAME and SYMBOL_INIT_DEMANGLED_NAME.
	* mdebugread.c (new_symbol): Likewise.
	* stabsread.c (define_symbol): Likewise.
	* coffread.c (process_coff_symbol): Likewise.
	* dwarfread.c (new_symbol): Likewise.

	* minsyms.c (prim_record_minimal_symbol_and_info): Use
	SYMBOL_SET_NAMES instead of setting SYMBOL_NAME.  Set the language
	here.
	(install_minimal_symbols): Don't set SYMBOL_LANGUAGE or call
	SYMBOL_INIT_DEMANGLED_NAME.
	* objfiles.c: Include "hashtab.h".
	(allocate_objfile): Call htab_set_functions_ex for the
	demangled_names_hash.
	(free_objfile): Call htab_delete for the demangled_names_hash.
	* objfiles.h (struct htab): Add declaration.
	(struct objfile): Add demangled_names_hash.
	* symfile.c: Include "hashtab.h".
	(reread_symbols): Call htab_delete for the demangled_names_hash.
	(add_psymbol_to_list): Use SYMBOL_SET_NAMES instead of putting
	SYMBOL_NAME in the bcache.
	* symtab.c: Include "hashtab.h".  Update comments.
	(create_demangled_names_hash, symbol_set_names): New functions.
	(symbol_find_demangled_name): New function, broken out from
	symbol_init_demangled_names.
	(symbol_init_demangled_names): Use it.
	* symtab.h (SYMBOL_INIT_DEMANGLED_NAME): Add missing parentheses.
	(SYMBOL_SET_NAMES): New macro.
	(symbol_set_names): Add prototype.

gdb/symtab.c

@@ -41,6 +41,8 @@
 #include "source.h"
 #include "filenames.h"		/* for FILENAME_CMP */
 
+#include "hashtab.h"
+
 #include "gdb_obstack.h"
 
 #include <sys/types.h>
@@ -425,22 +427,35 @@ symbol_init_language_specific (struct general_symbol_info *gsymbol,
     }
 }
 
-/* Initialize a symbol's mangled name.  */
+/* Functions to initialize a symbol's mangled name.  */
 
-/* Try to initialize the demangled name for a symbol, based on the
+/* Create the hash table used for demangled names.  Each hash entry is
+   a pair of strings; one for the mangled name and one for the demangled
+   name.  The entry is hashed via just the mangled name.  */
+
+static void
+create_demangled_names_hash (struct objfile *objfile)
+{
+  /* Choose 256 as the starting size of the hash table, somewhat arbitrarily.
+     The hash table code will round this up to the next prime number. 
+     Choosing a much larger table size wastes memory, and saves only about
+     1% in symbol reading.  */
+
+  objfile->demangled_names_hash = htab_create_alloc_ex
+    (256, htab_hash_string, (int (*) (const void *, const void *)) streq,
+     NULL, objfile->md, xmcalloc, xmfree);
+}
+
+/* Try to determine the demangled name for a symbol, based on the
    language of that symbol.  If the language is set to language_auto,
    it will attempt to find any demangling algorithm that works and
-   then set the language appropriately.  If no demangling of any kind
-   is found, the language is set back to language_unknown, so we can
-   avoid doing this work again the next time we encounter the symbol.
-   Any required space to store the name is obtained from the specified
-   obstack. */
+   then set the language appropriately.  The returned name is allocated
+   by the demangler and should be xfree'd.  */
 
-void
-symbol_init_demangled_name (struct general_symbol_info *gsymbol,
-                            struct obstack *obstack)
+static char *
+symbol_find_demangled_name (struct general_symbol_info *gsymbol,
+			    const char *mangled)
 {
-  char *mangled = gsymbol->name;
   char *demangled = NULL;
 
   if (gsymbol->language == language_unknown)
@@ -449,35 +464,116 @@ symbol_init_demangled_name (struct general_symbol_info *gsymbol,
       || gsymbol->language == language_auto)
     {
       demangled =
-        cplus_demangle (gsymbol->name, DMGL_PARAMS | DMGL_ANSI);
+        cplus_demangle (mangled, DMGL_PARAMS | DMGL_ANSI);
       if (demangled != NULL)
-        {
-          gsymbol->language = language_cplus;
-          gsymbol->language_specific.cplus_specific.demangled_name =
-            obsavestring (demangled, strlen (demangled), obstack);
-          xfree (demangled);
-        }
-      else
-        {
-          gsymbol->language_specific.cplus_specific.demangled_name = NULL;
-        }
+	{
+	  gsymbol->language = language_cplus;
+	  return demangled;
+	}
     }
   if (gsymbol->language == language_java)
     {
       demangled =
-        cplus_demangle (gsymbol->name,
+        cplus_demangle (mangled,
                         DMGL_PARAMS | DMGL_ANSI | DMGL_JAVA);
       if (demangled != NULL)
-        {
-          gsymbol->language = language_java;
-          gsymbol->language_specific.cplus_specific.demangled_name =
-            obsavestring (demangled, strlen (demangled), obstack);
-          xfree (demangled);
-        }
+	{
+	  gsymbol->language = language_java;
+	  return demangled;
+	}
+    }
+  return NULL;
+}
+
+/* Set both the mangled and demangled (if any) names for GSYMBOL based on
+   NAME and LEN.  The hash table corresponding to OBJFILE is used, and the
+   memory comes from that objfile's symbol_obstack.  NAME is copied, so the
+   pointer can be discarded after calling this function.  */
+
+void
+symbol_set_names (struct general_symbol_info *gsymbol,
+		  const char *name, int len, struct objfile *objfile)
+{
+  char **slot;
+  const char *tmpname;
+
+  if (objfile->demangled_names_hash == NULL)
+    create_demangled_names_hash (objfile);
+
+  /* The stabs reader generally provides names that are not NULL-terminated;
+     most of the other readers don't do this, so we can just use the given
+     copy.  */
+  if (name[len] != 0)
+    {
+      char *alloc_name = alloca (len + 1);
+      memcpy (alloc_name, name, len);
+      alloc_name[len] = 0;
+      tmpname = alloc_name;
+    }
+  else
+    tmpname = name;
+
+  slot = (char **) htab_find_slot (objfile->demangled_names_hash, tmpname, INSERT);
+
+  /* If this name is not in the hash table, add it.  */
+  if (*slot == NULL)
+    {
+      char *demangled_name = symbol_find_demangled_name (gsymbol, tmpname);
+      int demangled_len = demangled_name ? strlen (demangled_name) : 0;
+
+      /* If there is a demangled name, place it right after the mangled name.
+	 Otherwise, just place a second zero byte after the end of the mangled
+	 name.  */
+      *slot = obstack_alloc (&objfile->symbol_obstack,
+			     len + demangled_len + 2);
+      memcpy (*slot, tmpname, len + 1);
+      if (demangled_name)
+	{
+	  memcpy (*slot + len + 1, demangled_name, demangled_len + 1);
+	  xfree (demangled_name);
+	}
       else
-        {
-          gsymbol->language_specific.cplus_specific.demangled_name = NULL;
-        }
+	(*slot)[len + 1] = 0;
+    }
+
+  gsymbol->name = *slot;
+  if ((*slot)[len + 1])
+    gsymbol->language_specific.cplus_specific.demangled_name
+      = &(*slot)[len + 1];
+  else
+    gsymbol->language_specific.cplus_specific.demangled_name = NULL;
+}
+
+/* Initialize the demangled name of GSYMBOL if possible.  Any required space
+   to store the name is obtained from the specified obstack.  The function
+   symbol_set_names, above, should be used instead where possible for more
+   efficient memory usage.  */
+
+void
+symbol_init_demangled_name (struct general_symbol_info *gsymbol,
+                            struct obstack *obstack)
+{
+  char *mangled = gsymbol->name;
+  char *demangled = NULL;
+
+  demangled = symbol_find_demangled_name (gsymbol, mangled);
+  if (gsymbol->language == language_cplus
+      || gsymbol->language == language_java)
+    {
+      if (demangled)
+	{
+	  gsymbol->language_specific.cplus_specific.demangled_name
+	    = obsavestring (demangled, strlen (demangled), obstack);
+	  xfree (demangled);
+	}
+      else
+	gsymbol->language_specific.cplus_specific.demangled_name = NULL;
+    }
+  else
+    {
+      /* Unknown language; just clean up quietly.  */
+      if (demangled)
+	xfree (demangled);
     }
 }