[PATCH 1/5] Remove global variable tracepoint_list and stepping_list.

[Yao Qi <yao@codesourcery.com>]

This patch is a refactor patch.  Simply, it removes two global
variables tracepoint_list and stepping_list.

gdb:

2013-06-07  Pedro Alves  <pedro@codesourcery.com>
	    Yao Qi  <yao@codesourcery.com>

	* tracepoint.c (tracepoint_list, stepping_list): Remove.
	(do_clear_collection_list, init_collection_list): New.
	(encode_actions): Change the type of the second and third
	parameter from 'char ***' to 'struct collection_list *'.
	(encode_actions): Rename to encode_actions_rsp, and rewrite on top
	of the new encode_actions implementation.
	(encode_actions): New function.
	(_initialize_tracepoint): Delete references to 'tracepoint_list'
	and 'stepping_list'.
	* tracepoint.h (encode_actions): Remove declaration.
	(encode_actions_rsp): Add declaration.
	* remote.c (remote_download_tracepoint): Caller update.
---
 gdb/remote.c     |    2 +-
 gdb/tracepoint.c |  112 ++++++++++++++++++++++++++++++-----------------------
 gdb/tracepoint.h |    4 +-
 3 files changed, 66 insertions(+), 52 deletions(-)

diff --git a/gdb/remote.c b/gdb/remote.c
index 080d048..d06b1ed 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -10524,7 +10524,7 @@ remote_download_tracepoint (struct bp_location *loc)
   struct breakpoint *b = loc->owner;
   struct tracepoint *t = (struct tracepoint *) b;
 
-  encode_actions (loc, &tdp_actions, &stepping_actions);
+  encode_actions_rsp (loc, &tdp_actions, &stepping_actions);
   old_chain = make_cleanup (free_actions_list_cleanup_wrapper,
 			    tdp_actions);
   (void) make_cleanup (free_actions_list_cleanup_wrapper,
diff --git a/gdb/tracepoint.c b/gdb/tracepoint.c
index 5bad3e8..03f9230 100644
--- a/gdb/tracepoint.c
+++ b/gdb/tracepoint.c
@@ -873,8 +873,7 @@ struct collection_list
     /* True is the user requested a collection of "$_sdata", "static
        tracepoint data".  */
     int strace_data;
-  }
-tracepoint_list, stepping_list;
+  };
 
 /* MEMRANGE functions: */
 
@@ -1239,6 +1238,35 @@ clear_collection_list (struct collection_list *list)
   list->next_aexpr_elt = 0;
   memset (list->regs_mask, 0, sizeof (list->regs_mask));
   list->strace_data = 0;
+
+  xfree (list->aexpr_list);
+  xfree (list->list);
+}
+
+/* Wrapper to function clear_collection_list.  */
+
+static void
+do_clear_collection_list (void *list)
+{
+  struct collection_list *l = list;
+
+  clear_collection_list (l);
+}
+
+/* Initialize collection_list CLIST.  */
+
+static void
+init_collection_list (struct collection_list *clist)
+{
+  memset (clist, 0, sizeof *clist);
+
+  clist->listsize = 128;
+  clist->list = xcalloc (clist->listsize,
+			 sizeof (struct memrange));
+
+  clist->aexpr_listsize = 128;
+  clist->aexpr_list = xcalloc (clist->aexpr_listsize,
+			       sizeof (struct agent_expr *));
 }
 
 /* Reduce a collection list to string form (for gdb protocol).  */
@@ -1606,37 +1634,50 @@ encode_actions_1 (struct command_line *action,
     }				/* for */
 }
 
-/* Render all actions into gdb protocol.  */
-
-void
-encode_actions (struct bp_location *tloc, char ***tdp_actions,
-		char ***stepping_actions)
+static void
+encode_actions (struct bp_location *tloc,
+		struct collection_list *tracepoint_list,
+		struct collection_list *stepping_list)
 {
-  char *default_collect_line = NULL;
-  struct command_line *actions;
-  struct command_line *default_collect_action = NULL;
   int frame_reg;
   LONGEST frame_offset;
-  struct cleanup *back_to;
-
-  back_to = make_cleanup (null_cleanup, NULL);
+  struct command_line *actions;
+  struct cleanup *old_chain;
 
-  clear_collection_list (&tracepoint_list);
-  clear_collection_list (&stepping_list);
+  old_chain = make_cleanup (null_cleanup, NULL);
 
-  *tdp_actions = NULL;
-  *stepping_actions = NULL;
+  actions = all_tracepoint_actions_and_cleanup (tloc->owner);
 
   gdbarch_virtual_frame_pointer (tloc->gdbarch,
 				 tloc->address, &frame_reg, &frame_offset);
 
-  actions = all_tracepoint_actions_and_cleanup (tloc->owner);
-
   encode_actions_1 (actions, tloc, frame_reg, frame_offset,
-		    &tracepoint_list, &stepping_list);
+		    tracepoint_list, stepping_list);
+
+  do_cleanups (old_chain);
+
+  memrange_sortmerge (tracepoint_list);
+  memrange_sortmerge (stepping_list);
+}
+
+/* Render all actions into gdb protocol.  */
+
+void
+encode_actions_rsp (struct bp_location *tloc,
+		    char ***tdp_actions, char ***stepping_actions)
+{
+  struct cleanup *back_to;
+  struct collection_list tracepoint_list, stepping_list;
+
+  back_to = make_cleanup (null_cleanup, NULL);
 
-  memrange_sortmerge (&tracepoint_list);
-  memrange_sortmerge (&stepping_list);
+  init_collection_list (&tracepoint_list);
+  init_collection_list (&stepping_list);
+
+  make_cleanup (do_clear_collection_list, &tracepoint_list);
+  make_cleanup (do_clear_collection_list, &stepping_list);
+
+  encode_actions (tloc, &tracepoint_list, &stepping_list);
 
   *tdp_actions = stringify_collection_list (&tracepoint_list);
   *stepping_actions = stringify_collection_list (&stepping_list);
@@ -5673,33 +5714,6 @@ _initialize_tracepoint (void)
   traceframe_number = -1;
   tracepoint_number = -1;
 
-  if (tracepoint_list.list == NULL)
-    {
-      tracepoint_list.listsize = 128;
-      tracepoint_list.list = xmalloc
-	(tracepoint_list.listsize * sizeof (struct memrange));
-    }
-  if (tracepoint_list.aexpr_list == NULL)
-    {
-      tracepoint_list.aexpr_listsize = 128;
-      tracepoint_list.aexpr_list = xmalloc
-	(tracepoint_list.aexpr_listsize * sizeof (struct agent_expr *));
-    }
-
-  if (stepping_list.list == NULL)
-    {
-      stepping_list.listsize = 128;
-      stepping_list.list = xmalloc
-	(stepping_list.listsize * sizeof (struct memrange));
-    }
-
-  if (stepping_list.aexpr_list == NULL)
-    {
-      stepping_list.aexpr_listsize = 128;
-      stepping_list.aexpr_list = xmalloc
-	(stepping_list.aexpr_listsize * sizeof (struct agent_expr *));
-    }
-
   add_info ("scope", scope_info,
 	    _("List the variables local to a scope"));
 
diff --git a/gdb/tracepoint.h b/gdb/tracepoint.h
index 3b09ca8..5ecf1fb 100644
--- a/gdb/tracepoint.h
+++ b/gdb/tracepoint.h
@@ -357,8 +357,8 @@ void free_actions (struct breakpoint *);
 
 extern const char *decode_agent_options (const char *exp, int *trace_string);
 
-extern void encode_actions (struct bp_location *tloc,
-			    char ***tdp_actions, char ***stepping_actions);
+extern void encode_actions_rsp (struct bp_location *tloc,
+				char ***tdp_actions, char ***stepping_actions);
 
 extern void validate_actionline (const char *, struct breakpoint *);
 extern void validate_trace_state_variable_name (const char *name);
-- 
1.7.7.6