gdb: Remove an update of current_source_line and current_source_symtab

While reviewing some of the annotation code I noticed that
identify_source_line (in source.c) sets current_source_line,
current_source_symtab, and also calls clear_lines_listed_range.  This
seems a little strange, identify_source_line is really a wrapper
around annotate_source, and is only called when annotation_level is
greater than 0 (so annotations are turned on).

It seems weird (to me) that when annotations are on we update GDB's
idea of the "current" line/symtab, but when they are off we don't,
given that annotations are really about communicating GDB's state to a
user (GUI) and surely shouldn't be changing GDB's behaviour.

This commit removes from identify_source_line all of the setting of
current line/symtab and the call to clear_lines_listed_range, after
doing this GDB still passes all tests, so I don't believe these lines
were actually required.

With this code removed identify_source_line is only a wrapper around
annotate_source, so I moved identify_source_line to annotate.c and
renamed it to annotate_source_line.

gdb/ChangeLog:

	* annotate.c: Add 'source.h' and 'objfiles.h' includes.
	(annotate_source): Make static.
	(annotate_source_line): Moved from source.c and renamed from
	identify_source_line.  Update the return type.
	* annotate.h (annotate_source): Delete declaration.
	(annotate_source_line): Declaration moved from source.h, and
	renamed from identify_source_line.  Return type updated.
	* source.c (identify_source_line): Moved to annotate.c and renamed
	to annotate_source_line.
	(info_line_command): Remove check of annotation_level.
	* source.h (identify_source_line): Move declaration to annotate.h
	and rename to annotate_source_line.
	* stack.c: Add 'annotate.h' include.
	(print_frame_info): Remove check of annotation_level before
	calling annotate_source_line.

1 files changed, 28 insertions, 1 deletions

diff --git a/gdb/annotate.c b/gdb/annotate.c
index 84940ff..84f8129 100644
--- a/gdb/annotate.c
+++ b/gdb/annotate.c
@@ -26,6 +26,8 @@
 #include "inferior.h"
 #include "infrun.h"
 #include "top.h"
+#include "source.h"
+#include "objfiles.h"
 
 
 /* Prototypes for local functions.  */
@@ -417,7 +419,7 @@ annotate_arg_end (void)
     printf_filtered (("\n\032\032arg-end\n"));
 }
 
-void
+static void
 annotate_source (const char *filename, int line, int character, int mid,
 		 struct gdbarch *gdbarch, CORE_ADDR pc)
 {
@@ -430,6 +432,31 @@ annotate_source (const char *filename, int line, int character, int mid,
 		   mid ? "middle" : "beg", paddress (gdbarch, pc));
 }
 
+/* See annotate.h.  */
+
+bool
+annotate_source_line (struct symtab *s, int line, int mid_statement,
+		      CORE_ADDR pc)
+{
+  if (annotation_level > 0)
+    {
+      if (s->line_charpos == nullptr)
+	open_source_file_with_line_charpos (s);
+      if (s->fullname == nullptr)
+	return false;
+      /* Don't index off the end of the line_charpos array.  */
+      if (line > s->nlines)
+	return false;
+
+      annotate_source (s->fullname, line, s->line_charpos[line - 1],
+		       mid_statement, get_objfile_arch (SYMTAB_OBJFILE (s)),
+		       pc);
+      return true;
+    }
+  return false;
+}
+
+
 void
 annotate_frame_begin (int level, struct gdbarch *gdbarch, CORE_ADDR pc)
 {