Add constructor and destructor to demangle_parse_info

This adds a constructor and destructor to demangle_parse_info, and
then changes all the users to use them.  This removes
make_cleanup_cp_demangled_name_parse_free and its single use.

2017-01-10  Tom Tromey  <tom@tromey.com>

	* python/py-type.c (typy_legacy_template_argument): Update.
	* cp-support.h (struct demangle_parse_info) (demangle_parse_info,
	~demangle_parse_info): Declare new members.
	(cp_demangled_name_to_comp): Return unique_ptr.
	(cp_demangled_name_parse_free)
	(make_cleanup_cp_demangled_name_parse_free)
	(cp_new_demangle_parse_info): Remove.
	* cp-support.c (do_demangled_name_parse_free_cleanup)
	(make_cleanup_cp_demangled_name_parse_free): Remove.
	(inspect_type, cp_canonicalize_string_full)
	(cp_canonicalize_string): Update.
	(mangled_name_to_comp): Change return type.
	(cp_class_name_from_physname, method_name_from_physname)
	(cp_func_name, cp_remove_params): Update.
	* cp-name-parser.y (demangle_parse_info): New constructor, from
	cp_new_demangle_parse_info.
	(~demangle_parse_info): New destructor, from
	cp_demangled_name_parse_free.
	(cp_merge_demangle_parse_infos): Update.
	(cp_demangled_name_to_comp): Change return type.

5 files changed, 52 insertions, 79 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 06bff44..90d25cf 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,28 @@
 2017-01-10  Tom Tromey  <tom@tromey.com>
 
+	* python/py-type.c (typy_legacy_template_argument): Update.
+	* cp-support.h (struct demangle_parse_info) (demangle_parse_info,
+	~demangle_parse_info): Declare new members.
+	(cp_demangled_name_to_comp): Return unique_ptr.
+	(cp_demangled_name_parse_free)
+	(make_cleanup_cp_demangled_name_parse_free)
+	(cp_new_demangle_parse_info): Remove.
+	* cp-support.c (do_demangled_name_parse_free_cleanup)
+	(make_cleanup_cp_demangled_name_parse_free): Remove.
+	(inspect_type, cp_canonicalize_string_full)
+	(cp_canonicalize_string): Update.
+	(mangled_name_to_comp): Change return type.
+	(cp_class_name_from_physname, method_name_from_physname)
+	(cp_func_name, cp_remove_params): Update.
+	* cp-name-parser.y (demangle_parse_info): New constructor, from
+	cp_new_demangle_parse_info.
+	(~demangle_parse_info): New destructor, from
+	cp_demangled_name_parse_free.
+	(cp_merge_demangle_parse_infos): Update.
+	(cp_demangled_name_to_comp): Change return type.
+
+2017-01-10  Tom Tromey  <tom@tromey.com>
+
 	* top.c (prevent_dont_repeat): Change return type.
 	* python/python.c (execute_gdb_command): Use std::string.
 	Update.
diff --git a/gdb/cp-name-parser.y b/gdb/cp-name-parser.y
index 6d854f1..fd1e949 100644
--- a/gdb/cp-name-parser.y
+++ b/gdb/cp-name-parser.y
@@ -1999,29 +1999,19 @@ cp_comp_to_string (struct demangle_component *result, int estimated_len)
 			       &err);
 }
 
-/* A convenience function to allocate and initialize a new struct
-   demangled_parse_info.  */
+/* Constructor for demangle_parse_info.  */
 
-struct demangle_parse_info *
-cp_new_demangle_parse_info (void)
+demangle_parse_info::demangle_parse_info ()
+: info (NULL),
+  tree (NULL)
 {
-  struct demangle_parse_info *info;
-
-  info = XNEW (struct demangle_parse_info);
-  info->info = NULL;
-  info->tree = NULL;
-  obstack_init (&info->obstack);
-
-  return info;
+  obstack_init (&obstack);
 }
 
-/* Free any memory associated with the given PARSE_INFO.  */
+/* Destructor for demangle_parse_info.  */
 
-void
-cp_demangled_name_parse_free (struct demangle_parse_info *parse_info)
+demangle_parse_info::~demangle_parse_info ()
 {
-  struct demangle_info *info = parse_info->info;
-
   /* Free any allocated chunks of memory for the parse.  */
   while (info != NULL)
     {
@@ -2032,15 +2022,11 @@ cp_demangled_name_parse_free (struct demangle_parse_info *parse_info)
     }
 
   /* Free any memory allocated during typedef replacement.  */
-  obstack_free (&parse_info->obstack, NULL);
-
-  /* Free the parser info.  */
-  free (parse_info);
+  obstack_free (&obstack, NULL);
 }
 
 /* Merge the two parse trees given by DEST and SRC.  The parse tree
    in SRC is attached to DEST at the node represented by TARGET.
-   SRC is then freed.
 
    NOTE 1: Since there is no API to merge obstacks, this function does
    even attempt to try it.  Fortunately, we do not (yet?) need this ability.
@@ -2067,9 +2053,6 @@ cp_merge_demangle_parse_infos (struct demangle_parse_info *dest,
   /* Clear the (pointer to) SRC's parse data so that it is not freed when
      cp_demangled_parse_info_free is called.  */
   src->info = NULL;
-
-  /* Free SRC.  */
-  cp_demangled_name_parse_free (src);
 }
 
 /* Convert a demangled name to a demangle_component tree.  On success,
@@ -2078,11 +2061,10 @@ cp_merge_demangle_parse_infos (struct demangle_parse_info *dest,
    returned, and an error message will be set in *ERRMSG (which does
    not need to be freed).  */
 
-struct demangle_parse_info *
+struct std::unique_ptr<demangle_parse_info>
 cp_demangled_name_to_comp (const char *demangled_name, const char **errmsg)
 {
   static char errbuf[60];
-  struct demangle_parse_info *result;
 
   prev_lexptr = lexptr = demangled_name;
   error_lexptr = NULL;
@@ -2090,7 +2072,7 @@ cp_demangled_name_to_comp (const char *demangled_name, const char **errmsg)
 
   demangle_info = allocate_info ();
 
-  result = cp_new_demangle_parse_info ();
+  std::unique_ptr<demangle_parse_info> result (new demangle_parse_info);
   result->info = demangle_info;
 
   if (yyparse ())
@@ -2102,7 +2084,6 @@ cp_demangled_name_to_comp (const char *demangled_name, const char **errmsg)
 	  strcat (errbuf, "'");
 	  *errmsg = errbuf;
 	}
-      cp_demangled_name_parse_free (result);
       return NULL;
     }
 
diff --git a/gdb/cp-support.c b/gdb/cp-support.c
index c46c7fc..f4498f1 100644
--- a/gdb/cp-support.c
+++ b/gdb/cp-support.c
@@ -95,24 +95,6 @@ copy_string_to_obstack (struct obstack *obstack, const char *string,
   return (char *) obstack_copy (obstack, string, *len);
 }
 
-/* A cleanup wrapper for cp_demangled_name_parse_free.  */
-
-static void
-do_demangled_name_parse_free_cleanup (void *data)
-{
-  struct demangle_parse_info *info = (struct demangle_parse_info *) data;
-
-  cp_demangled_name_parse_free (info);
-}
-
-/* Create a cleanup for C++ name parsing.  */
-
-struct cleanup *
-make_cleanup_cp_demangled_name_parse_free (struct demangle_parse_info *info)
-{
-  return make_cleanup (do_demangled_name_parse_free_cleanup, info);
-}
-
 /* Return 1 if STRING is clearly already in canonical form.  This
    function is conservative; things which it does not recognize are
    assumed to be non-canonical, and the parser will sort them out
@@ -209,7 +191,7 @@ inspect_type (struct demangle_parse_info *info,
 	  long len;
 	  int is_anon;
 	  struct type *type;
-	  struct demangle_parse_info *i;
+	  std::unique_ptr<demangle_parse_info> i;
 	  struct ui_file *buf;
 
 	  /* Get the real type of the typedef.  */
@@ -272,7 +254,7 @@ inspect_type (struct demangle_parse_info *info,
 	  if (i != NULL)
 	    {
 	      /* Merge the two trees.  */
-	      cp_merge_demangle_parse_infos (info, ret_comp, i);
+	      cp_merge_demangle_parse_infos (info, ret_comp, i.get ());
 
 	      /* Replace any newly introduced typedefs -- but not
 		 if the type is anonymous (that would lead to infinite
@@ -540,22 +522,19 @@ cp_canonicalize_string_full (const char *string,
 {
   std::string ret;
   unsigned int estimated_len;
-  struct demangle_parse_info *info;
+  std::unique_ptr<demangle_parse_info> info;
 
   estimated_len = strlen (string) * 2;
   info = cp_demangled_name_to_comp (string, NULL);
   if (info != NULL)
     {
       /* Replace all the typedefs in the tree.  */
-      replace_typedefs (info, info->tree, finder, data);
+      replace_typedefs (info.get (), info->tree, finder, data);
 
       /* Convert the tree back into a string.  */
       ret = cp_comp_to_string (info->tree, estimated_len);
       gdb_assert (!ret.empty ());
 
-      /* Free the parse information.  */
-      cp_demangled_name_parse_free (info);
-
       /* Finally, compare the original string with the computed
 	 name, returning NULL if they are the same.  */
       if (ret == string)
@@ -581,7 +560,7 @@ cp_canonicalize_string_no_typedefs (const char *string)
 std::string
 cp_canonicalize_string (const char *string)
 {
-  struct demangle_parse_info *info;
+  std::unique_ptr<demangle_parse_info> info;
   unsigned int estimated_len;
 
   if (cp_already_canonical (string))
@@ -593,7 +572,6 @@ cp_canonicalize_string (const char *string)
 
   estimated_len = strlen (string) * 2;
   std::string ret = cp_comp_to_string (info->tree, estimated_len);
-  cp_demangled_name_parse_free (info);
 
   if (ret.empty ())
     {
@@ -614,12 +592,11 @@ cp_canonicalize_string (const char *string)
    freed when finished with the tree, or NULL if none was needed.
    OPTIONS will be passed to the demangler.  */
 
-static struct demangle_parse_info *
+static std::unique_ptr<demangle_parse_info>
 mangled_name_to_comp (const char *mangled_name, int options,
 		      void **memory, char **demangled_p)
 {
   char *demangled_name;
-  struct demangle_parse_info *info;
 
   /* If it looks like a v3 mangled name, then try to go directly
      to trees.  */
@@ -631,7 +608,7 @@ mangled_name_to_comp (const char *mangled_name, int options,
 					  options, memory);
       if (ret)
 	{
-	  info = cp_new_demangle_parse_info ();
+	  std::unique_ptr<demangle_parse_info> info (new demangle_parse_info);
 	  info->tree = ret;
 	  *demangled_p = NULL;
 	  return info;
@@ -646,7 +623,8 @@ mangled_name_to_comp (const char *mangled_name, int options,
   
   /* If we could demangle the name, parse it to build the component
      tree.  */
-  info = cp_demangled_name_to_comp (demangled_name, NULL);
+  std::unique_ptr<demangle_parse_info> info
+    = cp_demangled_name_to_comp (demangled_name, NULL);
 
   if (info == NULL)
     {
@@ -666,7 +644,7 @@ cp_class_name_from_physname (const char *physname)
   void *storage = NULL;
   char *demangled_name = NULL, *ret;
   struct demangle_component *ret_comp, *prev_comp, *cur_comp;
-  struct demangle_parse_info *info;
+  std::unique_ptr<demangle_parse_info> info;
   int done;
 
   info = mangled_name_to_comp (physname, DMGL_ANSI,
@@ -745,7 +723,6 @@ cp_class_name_from_physname (const char *physname)
 
   xfree (storage);
   xfree (demangled_name);
-  cp_demangled_name_parse_free (info);
   return ret;
 }
 
@@ -815,7 +792,7 @@ method_name_from_physname (const char *physname)
   void *storage = NULL;
   char *demangled_name = NULL, *ret;
   struct demangle_component *ret_comp;
-  struct demangle_parse_info *info;
+  std::unique_ptr<demangle_parse_info> info;
 
   info = mangled_name_to_comp (physname, DMGL_ANSI,
 			       &storage, &demangled_name);
@@ -832,7 +809,6 @@ method_name_from_physname (const char *physname)
 
   xfree (storage);
   xfree (demangled_name);
-  cp_demangled_name_parse_free (info);
   return ret;
 }
 
@@ -847,7 +823,7 @@ cp_func_name (const char *full_name)
 {
   char *ret;
   struct demangle_component *ret_comp;
-  struct demangle_parse_info *info;
+  std::unique_ptr<demangle_parse_info> info;
 
   info = cp_demangled_name_to_comp (full_name, NULL);
   if (!info)
@@ -859,7 +835,6 @@ cp_func_name (const char *full_name)
   if (ret_comp != NULL)
     ret = cp_comp_to_string (ret_comp, 10);
 
-  cp_demangled_name_parse_free (info);
   return ret;
 }
 
@@ -872,7 +847,7 @@ cp_remove_params (const char *demangled_name)
 {
   int done = 0;
   struct demangle_component *ret_comp;
-  struct demangle_parse_info *info;
+  std::unique_ptr<demangle_parse_info> info;
   char *ret = NULL;
 
   if (demangled_name == NULL)
@@ -905,7 +880,6 @@ cp_remove_params (const char *demangled_name)
   if (ret_comp->type == DEMANGLE_COMPONENT_TYPED_NAME)
     ret = cp_comp_to_string (d_left (ret_comp), 10);
 
-  cp_demangled_name_parse_free (info);
   return ret;
 }
 
diff --git a/gdb/cp-support.h b/gdb/cp-support.h
index b93e2d6..9054bf6 100644
--- a/gdb/cp-support.h
+++ b/gdb/cp-support.h
@@ -50,6 +50,10 @@ struct using_direct;
 
 struct demangle_parse_info
 {
+  demangle_parse_info ();
+
+  ~demangle_parse_info ();
+
   /* The memory used during the parse.  */
   struct demangle_info *info;
 
@@ -135,21 +139,16 @@ struct type *cp_find_type_baseclass_by_name (struct type *parent_type,
 
 /* Functions from cp-name-parser.y.  */
 
-extern struct demangle_parse_info *cp_demangled_name_to_comp
+extern std::unique_ptr<demangle_parse_info> cp_demangled_name_to_comp
      (const char *demangled_name, const char **errmsg);
 
 extern char *cp_comp_to_string (struct demangle_component *result,
 				int estimated_len);
 
-extern void cp_demangled_name_parse_free (struct demangle_parse_info *);
-extern struct cleanup *make_cleanup_cp_demangled_name_parse_free
-     (struct demangle_parse_info *);
 extern void cp_merge_demangle_parse_infos (struct demangle_parse_info *,
 					   struct demangle_component *,
 					   struct demangle_parse_info *);
 
-extern struct demangle_parse_info *cp_new_demangle_parse_info (void);
-
 /* The list of "maint cplus" commands.  */
 
 extern struct cmd_list_element *maint_cplus_cmd_list;
diff --git a/gdb/python/py-type.c b/gdb/python/py-type.c
index f19d8d9..7862829 100644
--- a/gdb/python/py-type.c
+++ b/gdb/python/py-type.c
@@ -832,7 +832,7 @@ typy_legacy_template_argument (struct type *type, const struct block *block,
 {
   int i;
   struct demangle_component *demangled;
-  struct demangle_parse_info *info = NULL;
+  std::unique_ptr<demangle_parse_info> info;
   const char *err;
   struct type *argtype;
   struct cleanup *cleanup;
@@ -860,7 +860,6 @@ typy_legacy_template_argument (struct type *type, const struct block *block,
       return NULL;
     }
   demangled = info->tree;
-  cleanup = make_cleanup_cp_demangled_name_parse_free (info);
 
   /* Strip off component names.  */
   while (demangled->type == DEMANGLE_COMPONENT_QUAL_NAME
@@ -869,7 +868,6 @@ typy_legacy_template_argument (struct type *type, const struct block *block,
 
   if (demangled->type != DEMANGLE_COMPONENT_TEMPLATE)
     {
-      do_cleanups (cleanup);
       PyErr_SetString (PyExc_RuntimeError, _("Type is not a template."));
       return NULL;
     }
@@ -882,14 +880,12 @@ typy_legacy_template_argument (struct type *type, const struct block *block,
 
   if (! demangled)
     {
-      do_cleanups (cleanup);
       PyErr_Format (PyExc_RuntimeError, _("No argument %d in template."),
 		    argno);
       return NULL;
     }
 
   argtype = typy_lookup_type (demangled->u.s_binary.left, block);
-  do_cleanups (cleanup);
   if (! argtype)
     return NULL;