perf ui annotate browser: Allow toggling addr offset view

The lines in objdump have this format:

    ffffffff8126543f:       jne    ffffffff81265494 <__list_del_entry+0x84>
<SNIP>
    ffffffff81265494:       mov    %rdi,%rcx

Since we now have objdump_line allowing tools to print the offset
independently from the rest of the line, allow toggling a view where
just offsets from the start of the function are shown:

     2f:       jne    ffffffff81265494 <__list_del_entry+0x84>
<SNIP>
     84:       mov    %rdi,%rcx

The offset view will be the default as soon as operations that deal with
offsets in a function are handled accodringly, i.e. in offset view the
above will become:

     2f:       jne    __list_del_entry+0x84
<SNIP>
     84:       mov    %rdi,%rcx

And then a follow up patch will allow navigating thru jumps, just like
we handle callq instructions.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-4zpgimmz8xv7b5c920el7s45@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/ui/browsers/annotate.c

@@ -20,6 +20,7 @@ struct annotate_browser {
 	int		    nr_asm_entries;
 	int		    nr_entries;
 	bool		    hide_src_code;
+	bool		    use_offset;
 };
 
 struct objdump_line_rb_node {
@@ -82,10 +83,13 @@ static void annotate_browser__write(struct ui_browser *self, void *entry, int ro
 		slsmg_write_nstring(ol->line, width - 18);
 	else {
 		char bf[64];
-		u64 addr = ab->start + ol->offset;
-		int printed = scnprintf(bf, sizeof(bf), " %" PRIx64 ":", addr);
-		int color = -1;
+		u64 addr = ol->offset;
+		int printed, color = -1;
 
+		if (!ab->use_offset)
+			addr += ab->start;
+
+		printed = scnprintf(bf, sizeof(bf), " %" PRIx64 ":", addr);
 		if (change_color)
 			color = ui_browser__set_color(self, HE_COLORSET_ADDR);
 		slsmg_write_nstring(bf, printed);
@@ -250,6 +254,7 @@ static int annotate_browser__run(struct annotate_browser *self, int evidx,
 	struct symbol *sym = ms->sym;
 	const char *help = "<-/ESC: Exit, TAB/shift+TAB: Cycle hot lines, "
 			   "H: Go to hottest line, ->/ENTER: Line action, "
+			   "O: Toggle offset view, "
 			   "S: Toggle source code view";
 	int key;
 
@@ -310,6 +315,10 @@ static int annotate_browser__run(struct annotate_browser *self, int evidx,
 			if (annotate_browser__toggle_source(self))
 				ui_helpline__puts(help);
 			continue;
+		case 'O':
+		case 'o':
+			self->use_offset = !self->use_offset;
+			continue;
 		case K_ENTER:
 		case K_RIGHT:
 			if (self->selection == NULL) {