perf annotate: Return arch from symbol__disassemble() and save it in browser

In annotate browser, we will add support to check fused instructions.
While this is x86-specific feature so we need the annotate browser to
know what the arch it runs on.

symbol__disassemble() has figured out the arch. This patch just lets the
arch return from symbol__disassemble and save the arch in annotate
browser.

Signed-off-by: Yao Jin <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Kan Liang <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/builtin-top.c

···
 		return err;
 	}
 
-	err = symbol__disassemble(sym, map, NULL, 0);
+	err = symbol__disassemble(sym, map, NULL, 0, NULL);
 	if (err == 0) {
 out_assign:
 		top->sym_filter_entry = he;

tools/perf/ui/browsers/annotate.c

···
 	.jump_arrows	= true,
 };
 
+struct arch;
+
 struct annotate_browser {
 	struct ui_browser b;
 	struct rb_root	  entries;
 	struct rb_node	  *curr_hot;
 	struct disasm_line  *selection;
 	struct disasm_line  **offsets;
+	struct arch	    *arch;
 	int		    nr_events;
 	u64		    start;
 	int		    nr_asm_entries;
···
 		  (nr_pcnt - 1);
 	}
 
-	err = symbol__disassemble(sym, map, perf_evsel__env_arch(evsel), sizeof_bdl);
+	err = symbol__disassemble(sym, map, perf_evsel__env_arch(evsel),
+				  sizeof_bdl, &browser.arch);
 	if (err) {
 		char msg[BUFSIZ];
 		symbol__strerror_disassemble(sym, map, err, msg, sizeof(msg));

tools/perf/ui/gtk/annotate.c

···
 	if (map->dso->annotate_warned)
 		return -1;
 
-	err = symbol__disassemble(sym, map, perf_evsel__env_arch(evsel), 0);
+	err = symbol__disassemble(sym, map, perf_evsel__env_arch(evsel),
+				  0, NULL);
 	if (err) {
 		char msg[BUFSIZ];
 		symbol__strerror_disassemble(sym, map, err, msg, sizeof(msg));

tools/perf/util/annotate.c

···
 	return normalize_arch((char *)arch_name);
 }
 
-int symbol__disassemble(struct symbol *sym, struct map *map, const char *arch_name, size_t privsize)
+int symbol__disassemble(struct symbol *sym, struct map *map,
+			const char *arch_name, size_t privsize,
+			struct arch **parch)
 {
 	struct dso *dso = map->dso;
 	char command[PATH_MAX * 2];
···
 	arch = arch__find(arch_name);
 	if (arch == NULL)
 		return -ENOTSUP;
+
+	if (parch)
+		*parch = arch;
 
 	if (arch->init) {
 		err = arch->init(arch);
···
 	struct rb_root source_line = RB_ROOT;
 	u64 len;
 
-	if (symbol__disassemble(sym, map, perf_evsel__env_arch(evsel), 0) < 0)
+	if (symbol__disassemble(sym, map, perf_evsel__env_arch(evsel),
+				0, NULL) < 0)
 		return -1;
 
 	len = symbol__size(sym);

tools/perf/util/annotate.h

···
 int symbol__alloc_hist(struct symbol *sym);
 void symbol__annotate_zero_histograms(struct symbol *sym);
 
-int symbol__disassemble(struct symbol *sym, struct map *map, const char *arch_name, size_t privsize);
+int symbol__disassemble(struct symbol *sym, struct map *map,
+			const char *arch_name, size_t privsize,
+			struct arch **parch);
 
 enum symbol_disassemble_errno {
 	SYMBOL_ANNOTATE_ERRNO__SUCCESS		= 0,