perf annotate browser: Align jump labels

Find out at browser startup the max width and use it when rendering jump
labels on the screen.

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-7dxjiwqb77wz6f5lc05e0i0x@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/ui/browsers/annotate.c

@@ -31,6 +31,7 @@ struct annotate_browser {
 	bool		    hide_src_code;
 	bool		    use_offset;
 	bool		    searching_backwards;
+	u8		    offset_width;
 	char		    search_bf[128];
 };
 
@@ -92,10 +93,17 @@ static void annotate_browser__write(struct ui_browser *self, void *entry, int ro
 		if (!ab->use_offset)
 			addr += ab->start;
 
-		if (bdl->jump_target || !ab->use_offset)
-			printed = scnprintf(bf, sizeof(bf), " %" PRIx64 ":", addr);
-		else
-			printed = scnprintf(bf, sizeof(bf), "    ");
+		if (!ab->use_offset) {
+			printed = scnprintf(bf, sizeof(bf), "%" PRIx64 ":", addr);
+		} else {
+			if (bdl->jump_target) {
+				printed = scnprintf(bf, sizeof(bf), "%*" PRIx64 ":",
+						    ab->offset_width, addr);
+			} else {
+				printed = scnprintf(bf, sizeof(bf), "%*s ",
+						    ab->offset_width, " ");
+			}
+		}
 
 		if (change_color)
 			color = ui_browser__set_color(self, HE_COLORSET_ADDR);
@@ -687,6 +695,7 @@ int symbol__tui_annotate(struct symbol *sym, struct map *map, int evidx,
 
 	annotate_browser__mark_jump_targets(&browser, size);
 
+	browser.offset_width = hex_width(size);
 	browser.b.nr_entries = browser.nr_entries;
 	browser.b.entries = &notes->src->source,
 	browser.b.width += 18; /* Percentage */

tools/perf/util/util.c

@@ -148,3 +148,13 @@ int readn(int fd, void *buf, size_t n)
 
 	return buf - buf_start;
 }
+
+size_t hex_width(u64 v)
+{
+	size_t n = 1;
+
+	while ((v >>= 4))
+		++n;
+
+	return n;
+}

tools/perf/util/util.h

@@ -265,4 +265,6 @@ bool is_power_of_2(unsigned long n)
 	return (n != 0 && ((n & (n - 1)) == 0));
 }
 
+size_t hex_width(u64 v);
+
 #endif