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perf annotate browser: Initial support for navigating jump instructions

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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>
This commit is contained in:
Arnaldo Carvalho de Melo 2012-04-03 21:35:35 -03:00
parent b0ffb2c48a
commit 08be4eeda4
1 changed files with 61 additions and 2 deletions
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63
tools/perf/util/ui/browsers/annotate.c
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@ -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: