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Subject[PATCH 6/8] perf annotate browser: Initial support for navigating jump instructions
Date
From: Arnaldo Carvalho de Melo <acme@redhat.com>

Now it is possible to press ENTER or -> (right arrow) on jump
instructions to navigate to the offset it points to.

More work needed to support <- to go back, i.e. a jump history.

This is done just like the callq case, i.e. parsing objdump output
lines, but should move to use Masami's disassembler at some point.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.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-706qqe2xibeiocuabp39mby7@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/ui/browsers/annotate.c | 63 +++++++++++++++++++++++++++++++-
1 file changed, 61 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/ui/browsers/annotate.c b/tools/perf/util/ui/browsers/annotate.c
index c52543c..752d8d0 100644
--- a/tools/perf/util/ui/browsers/annotate.c
+++ b/tools/perf/util/ui/browsers/annotate.c
@@ -168,6 +168,9 @@ static void annotate_browser__set_top(struct annotate_browser *self,
while (self->b.top_idx != 0 && back != 0) {
pos = list_entry(pos->node.prev, struct objdump_line, node);

+ if (objdump_line__filter(&self->b, &pos->node))
+ continue;
+
--self->b.top_idx;
--back;
}
@@ -296,6 +299,61 @@ static bool annotate_browser__callq(struct annotate_browser *browser,
return true;
}

+static struct objdump_line *
+ annotate_browser__find_offset(struct annotate_browser *browser,
+ s64 offset, s64 *idx)
+{
+ struct map_symbol *ms = browser->b.priv;
+ struct symbol *sym = ms->sym;
+ struct annotation *notes = symbol__annotation(sym);
+ struct objdump_line *pos;
+
+ *idx = 0;
+ list_for_each_entry(pos, &notes->src->source, node) {
+ if (pos->offset == offset)
+ return pos;
+ if (!objdump_line__filter(&browser->b, &pos->node))
+ ++*idx;
+ }
+
+ return NULL;
+}
+
+static bool annotate_browser__jump(struct annotate_browser *browser)
+{
+ const char *jumps[] = { "je ", "jne ", "ja ", "jmpq ", "js ", "jmp ", NULL };
+ struct objdump_line *line;
+ s64 idx, offset;
+ char *s = NULL;
+ int i = 0;
+
+ while (jumps[i]) {
+ s = strstr(browser->selection->line, jumps[i++]);
+ if (s)
+ break;
+ }
+
+ if (s == NULL)
+ return false;
+
+ s = strchr(s, '+');
+ if (s++ == NULL) {
+ ui_helpline__puts("Invallid jump instruction.");
+ return true;
+ }
+
+ offset = strtoll(s, NULL, 16);
+ line = annotate_browser__find_offset(browser, offset, &idx);
+ if (line == NULL) {
+ ui_helpline__puts("Invallid jump offset");
+ return true;
+ }
+
+ annotate_browser__set_top(browser, line, idx);
+
+ return true;
+}
+
static int annotate_browser__run(struct annotate_browser *self, int evidx,
void(*timer)(void *arg),
void *arg, int delay_secs)
@@ -376,8 +434,9 @@ static int annotate_browser__run(struct annotate_browser *self, int evidx,
ui_helpline__puts("Huh? No selection. Report to linux-kernel@vger.kernel.org");
else if (self->selection->offset == -1)
ui_helpline__puts("Actions are only available for assembly lines.");
- else if (!annotate_browser__callq(self, evidx, timer, arg, delay_secs))
- ui_helpline__puts("Actions are only available for the 'callq' instruction.");
+ else if (!(annotate_browser__jump(self) ||
+ annotate_browser__callq(self, evidx, timer, arg, delay_secs)))
+ ui_helpline__puts("Actions are only available for the 'callq' and jump instructions.");
continue;
case K_LEFT:
case K_ESC:
--
1.7.9.2.358.g22243


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