Use function_view in traceframe_walk_blocks

This change traceframe_walk_blocks to take a function_view.  This
simplifies the code somewhat and lets us entirely remove one helper
function.

Reviewed-by: Keith Seitz <keiths@redhat.com>

diff --git a/gdb/tracefile-tfile.c b/gdb/tracefile-tfile.c
index 364f8c1f08e52328f4cf6237803a232627d45045..d3304b0b355cecd06223bc32a7899e08f76791ee 100644 (file)
--- a/gdb/tracefile-tfile.c
+++ b/gdb/tracefile-tfile.c
@@ -773,33 +773,15 @@ tfile_target::trace_find (enum trace_find_type type, int num,
   return -1;
 }
 
-/* Prototype of the callback passed to tframe_walk_blocks.  */
-typedef int (*walk_blocks_callback_func) (char blocktype, void *data);
-
-/* Callback for traceframe_walk_blocks, used to find a given block
-   type in a traceframe.  */
-
-static int
-match_blocktype (char blocktype, void *data)
-{
-  char *wantedp = (char *) data;
-
-  if (*wantedp == blocktype)
-    return 1;
-
-  return 0;
-}
-
 /* Walk over all traceframe block starting at POS offset from
-   CUR_OFFSET, and call CALLBACK for each block found, passing in DATA
-   unmodified.  If CALLBACK returns true, this returns the position in
-   the traceframe where the block is found, relative to the start of
-   the traceframe (cur_offset).  Returns -1 if no callback call
-   returned true, indicating that all blocks have been walked.  */
+   CUR_OFFSET, and call CALLBACK for each block found.  If CALLBACK
+   returns true, this returns the position in the traceframe where the
+   block is found, relative to the start of the traceframe
+   (cur_offset).  Returns -1 if no callback call returned true,
+   indicating that all blocks have been walked.  */
 
 static int
-traceframe_walk_blocks (walk_blocks_callback_func callback,
-                       int pos, void *data)
+traceframe_walk_blocks (gdb::function_view<bool (char)> callback, int pos)
 {
   /* Iterate through a traceframe's blocks, looking for a block of the
      requested type.  */
@@ -814,7 +796,7 @@ traceframe_walk_blocks (walk_blocks_callback_func callback,
 
       ++pos;
 
-      if ((*callback) (block_type, data))
+      if (callback (block_type))
        return pos;
 
       switch (block_type)
@@ -854,7 +836,10 @@ traceframe_walk_blocks (walk_blocks_callback_func callback,
 static int
 traceframe_find_block_type (char type_wanted, int pos)
 {
-  return traceframe_walk_blocks (match_blocktype, pos, &type_wanted);
+  return traceframe_walk_blocks ([&] (char blocktype)
+    {
+      return blocktype == type_wanted;
+    }, pos);
 }
 
 /* Look for a block of saved registers in the traceframe, and get the
@@ -1060,11 +1045,9 @@ tfile_target::get_trace_state_variable_value (int tsvnum, LONGEST *val)
 /* Callback for traceframe_walk_blocks.  Builds a traceframe_info
    object for the tfile target's current traceframe.  */
 
-static int
-build_traceframe_info (char blocktype, void *data)
+static bool
+build_traceframe_info (char blocktype, struct traceframe_info *info)
 {
-  struct traceframe_info *info = (struct traceframe_info *) data;
-
   switch (blocktype)
     {
     case 'M':
@@ -1104,7 +1087,7 @@ build_traceframe_info (char blocktype, void *data)
       break;
     }
 
-  return 0;
+  return false;
 }
 
 traceframe_info_up
@@ -1112,7 +1095,10 @@ tfile_target::traceframe_info ()
 {
   traceframe_info_up info (new struct traceframe_info);
 
-  traceframe_walk_blocks (build_traceframe_info, 0, info.get ());
+  traceframe_walk_blocks ([&] (char blocktype)
+    {
+      return build_traceframe_info (blocktype, info.get ());
+    }, 0);
 
   return info;
 }