perf annotate: Resolve 'call' operands to function names

Before this patch the '_raw_spin_lock_irqsave' and 'update_rq_clock' operands
were appearing just as hexadecimal numbers:

  update_blocked_averages  /proc/kcore
       │       push   %r12
       │       push   %rbx
       │       and    $0xfffffffffffffff0,%rsp
       │       sub    $0x40,%rsp
       │       add    -0x662cac00(,%rdi,8),%rax
       │       mov    %rax,%rbx
       │       mov    %rax,%rdi
       │       mov    %rax,0x38(%rsp)
       │     → callq  _raw_spin_lock_irqsave
       │       mov    %rbx,%rdi
       │       mov    %rax,0x30(%rsp)
       │     → callq  update_rq_clock
       │       mov    0x8d0(%rbx),%rax
       │       lea    0x8d0(%rbx),%r11

To check that all is right one can always use the 'o' hotkey and see
the original objdump -dS output, that for this case is:

  update_blocked_averages  /proc/kcore
       │ffffffff990d5489:   push   %r12
       │ffffffff990d548b:   push   %rbx
       │ffffffff990d548c:   and    $0xfffffffffffffff0,%rsp
       │ffffffff990d5490:   sub    $0x40,%rsp
       │ffffffff990d5494:   add    -0x662cac00(,%rdi,8),%rax
       │ffffffff990d549c:   mov    %rax,%rbx
       │ffffffff990d549f:   mov    %rax,%rdi
       │ffffffff990d54a2:   mov    %rax,0x38(%rsp)
       │ffffffff990d54a7: → callq  0xffffffff997eb7a0
       │ffffffff990d54ac:   mov    %rbx,%rdi
       │ffffffff990d54af:   mov    %rax,0x30(%rsp)
       │ffffffff990d54b4: → callq  0xffffffff990c7720
       │ffffffff990d54b9:   mov    0x8d0(%rbx),%rax
       │ffffffff990d54c0:   lea    0x8d0(%rbx),%r11

Use the 'h' hotkey to see a list of available hotkeys.

More work needed to cover operands for other instructions, such as 'mov',
that can resolve variable names, etc.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Chris Riyder <chris.ryder@arm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Markus Trippelsdorf <markus@trippelsdorf.de>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Taeung Song <treeze.taeung@gmail.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-xqgtw9mzmzcjgwkis9kiiv1p@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/annotate.c

@@ -54,7 +54,7 @@ int ins__scnprintf(struct ins *ins, char *bf, size_t size,
 	return ins__raw_scnprintf(ins, bf, size, ops);
 }
 
-static int call__parse(struct ins_operands *ops, struct map *map __maybe_unused)
+static int call__parse(struct ins_operands *ops, struct map *map)
 {
 	char *endptr, *tok, *name;
 
@@ -84,7 +84,11 @@ static int call__parse(struct ins_operands *ops, struct map *map __maybe_unused)
 indirect_call:
 	tok = strchr(endptr, '*');
 	if (tok == NULL) {
-		ops->target.addr = 0;
+		struct symbol *sym = map__find_symbol(map, map->map_ip(map, ops->target.addr));
+		if (sym != NULL)
+			ops->target.name = strdup(sym->name);
+		else
+			ops->target.addr = 0;
 		return 0;
 	}