Replace VEC(gdb_xml_value_s) with std::vector

This patch replaces VEC(gdb_xml_value_s), which is passed to XML
visitors, with an std::vector.  In order to be able to remove the
cleanup in gdb_xml_parser::start_element, the gdb_xml_parser structure
is made to own the value with a gdb::unique_xmalloc_ptr.

This patch has been tested on the buildbot.

gdb/ChangeLog:

	* xml-support.h (struct gdb_xml_value): Add constructor.
	<value>: Change type to unique_xmalloc_ptr.
	(gdb_xml_value_s): Remove typedef.
	(DEF_VEC_O (gdb_xml_value_s)): Remove.
	(gdb_xml_element_start_handler): Change parameter type to
	std::vector.
	(xml_find_attribute): Likewise.
	* xml-support.c (xml_find_attribute): Change parameter type to
	std::vector and adjust.
	(gdb_xml_values_cleanup): Remove.
	(gdb_xml_parser::start_element): Adjust to std::vector.
	(xinclude_start_include): Change paraeter type to std::vector
	and adjust.
	* btrace.c (check_xml_btrace_version): Likewise.
	(parse_xml_btrace_block): Likewise.
	(parse_xml_btrace_pt_config_cpu): Likewise.
	(parse_xml_btrace_pt): Likewise.
	(parse_xml_btrace_conf_bts): Likewise.
	(parse_xml_btrace_conf_pt): Likewise.
	* memory-map.c (memory_map_start_memory): Likewise.
	(memory_map_start_property): Likewise.
	* osdata.c (osdata_start_osdata): Likewise.
	(osdata_start_item): Likewise.
	(osdata_start_column): Likewise.
	* remote.c (start_thread): Likewise.
	* solib-aix.c (library_list_start_library): Likewise.
	(library_list_start_list): Likewise.
	* solib-svr4.c (library_list_start_library): Likewise.
	(svr4_library_list_start_list): Likewise.
	* solib-target.c (library_list_start_segment): Likewise.
	(library_list_start_section): Likewise.
	(library_list_start_library): Likewise.
	(library_list_start_list): Likewise.
	* tracepoint.c (traceframe_info_start_memory): Likewise.
	(traceframe_info_start_tvar): Likewise.
	* xml-syscall.c (syscall_start_syscall): Likewise.
	* xml-tdesc.c (tdesc_start_target): Likewise.
	(tdesc_start_feature): Likewise.
	(tdesc_start_reg): Likewise.
	(tdesc_start_union): Likewise.
	(tdesc_start_struct): Likewise.
	(tdesc_start_flags): Likewise.
	(tdesc_start_enum): Likewise.
	(tdesc_start_field): Likewise.
	(tdesc_start_enum_value): Likewise.
	(tdesc_start_vector): Likewise.

1 files changed, 10 insertions, 32 deletions

diff --git a/gdb/xml-support.c b/gdb/xml-support.c
index dacc5c4..2547882 100644
--- a/gdb/xml-support.c
+++ b/gdb/xml-support.c
@@ -228,32 +228,16 @@ gdb_xml_error (struct gdb_xml_parser *parser, const char *format, ...)
    ATTRIBUTES.  Returns NULL if not found.  */
 
 struct gdb_xml_value *
-xml_find_attribute (VEC(gdb_xml_value_s) *attributes, const char *name)
+xml_find_attribute (std::vector<gdb_xml_value> &attributes,
+		    const char *name)
 {
-  struct gdb_xml_value *value;
-  int ix;
-
-  for (ix = 0; VEC_iterate (gdb_xml_value_s, attributes, ix, value); ix++)
-    if (strcmp (value->name, name) == 0)
-      return value;
+  for (gdb_xml_value &value : attributes)
+    if (strcmp (value.name, name) == 0)
+      return &value;
 
   return NULL;
 }
 
-/* Clean up a vector of parsed attribute values.  */
-
-static void
-gdb_xml_values_cleanup (void *data)
-{
-  VEC(gdb_xml_value_s) **values = (VEC(gdb_xml_value_s) **) data;
-  struct gdb_xml_value *value;
-  int ix;
-
-  for (ix = 0; VEC_iterate (gdb_xml_value_s, *values, ix, value); ix++)
-    xfree (value->value);
-  VEC_free (gdb_xml_value_s, *values);
-}
-
 /* Handle the start of an element.  NAME is the element, and ATTRS are
    the names and values of this element's attributes.  */
 
@@ -266,9 +250,7 @@ gdb_xml_parser::start_element (const XML_Char *name,
 
   const struct gdb_xml_element *element;
   const struct gdb_xml_attribute *attribute;
-  VEC(gdb_xml_value_s) *attributes = NULL;
   unsigned int seen;
-  struct cleanup *back_to;
 
   /* Push an error scope.  If we return or throw an exception before
      filling this in, it will tell us to ignore children of this
@@ -317,7 +299,7 @@ gdb_xml_parser::start_element (const XML_Char *name,
 
   scope.seen |= seen;
 
-  back_to = make_cleanup (gdb_xml_values_cleanup, &attributes);
+  std::vector<gdb_xml_value> attributes;
 
   for (attribute = element->attributes;
        attribute != NULL && attribute->name != NULL;
@@ -326,7 +308,6 @@ gdb_xml_parser::start_element (const XML_Char *name,
       const char *val = NULL;
       const XML_Char **p;
       void *parsed_value;
-      struct gdb_xml_value new_value;
 
       for (p = attrs; *p != NULL; p += 2)
 	if (!strcmp (attribute->name, p[0]))
@@ -361,9 +342,7 @@ gdb_xml_parser::start_element (const XML_Char *name,
       else
 	parsed_value = xstrdup (val);
 
-      new_value.name = attribute->name;
-      new_value.value = parsed_value;
-      VEC_safe_push (gdb_xml_value_s, attributes, &new_value);
+      attributes.emplace_back (attribute->name, parsed_value);
     }
 
   /* Check for unrecognized attributes.  */
@@ -395,8 +374,6 @@ gdb_xml_parser::start_element (const XML_Char *name,
   scope_level &new_scope = m_scopes.back ();
   new_scope.element = element;
   new_scope.elements = element->children;
-
-  do_cleanups (back_to);
 }
 
 /* Wrapper for gdb_xml_start_element, to prevent throwing exceptions
@@ -803,11 +780,12 @@ struct xinclude_parsing_data
 static void
 xinclude_start_include (struct gdb_xml_parser *parser,
 			const struct gdb_xml_element *element,
-			void *user_data, VEC(gdb_xml_value_s) *attributes)
+			void *user_data,
+			std::vector<gdb_xml_value> &attributes)
 {
   struct xinclude_parsing_data *data
     = (struct xinclude_parsing_data *) user_data;
-  char *href = (char *) xml_find_attribute (attributes, "href")->value;
+  char *href = (char *) xml_find_attribute (attributes, "href")->value.get ();
 
   gdb_xml_debug (parser, _("Processing XInclude of \"%s\""), href);