Explicit locations -label completer

We're missing a completer for

  (gdb) break -function func -label [TAB]

This patch adds one.  Tests will be added later in the series.

gdb/ChangeLog:
2017-07-17  Pedro Alves  <palves@redhat.com>

	* completer.c (collect_explicit_location_matches): Handle
	MATCH_LABEL.
	(convert_explicit_location_to_linespec): New, factored out from
	...
	(convert_explicit_location_to_sals): ... this.
	(complete_label): New.
	(linespec_complete_label, find_label_symbols_in_block): New.
	(find_label_symbols): Add completion_mode parameter and adjust to
	call find_label_symbols_in_block.
	* linespec.h (linespec_complete_label): Declare.

1 files changed, 11 insertions, 0 deletions

diff --git a/gdb/linespec.h b/gdb/linespec.h
index d55ba12..f16bb81 100644
--- a/gdb/linespec.h
+++ b/gdb/linespec.h
@@ -194,6 +194,17 @@ extern void linespec_complete_function (completion_tracker &tracker,
 					const char *function,
 					const char *source_filename);
 
+/* Complete a label symbol, in linespec mode.  Only labels of
+   functions named FUNCTION_NAME are considered.  If SOURCE_FILENAME
+   is non-NULL, limits completion to labels of functions defined in
+   source files that match SOURCE_FILENAME.  */
+
+extern void linespec_complete_label (completion_tracker &tracker,
+				     const struct language_defn *language,
+				     const char *source_filename,
+				     const char *function_name,
+				     const char *label_name);
+
 /* Evaluate the expression pointed to by EXP_PTR into a CORE_ADDR,
    advancing EXP_PTR past any parsed text.  */