perf evsel: Require that callchains be resolved before calling fprintf_{sym,callchain}

This way the print routine merely does printing, not requiring access to
the resolving machinery, which helps disentangling the object files and
easing creating subsets with a limited functionality set.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-2ti2jbra8fypdfawwwm3aee3@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-script.c

@@ -569,19 +569,23 @@ static void print_sample_bts(struct perf_sample *sample,
 	/* print branch_from information */
 	if (PRINT_FIELD(IP)) {
 		unsigned int print_opts = output[attr->type].print_ip_opts;
+		struct callchain_cursor *cursor = NULL, cursor_callchain;
 
-		if (symbol_conf.use_callchain && sample->callchain) {
-			printf("\n");
-		} else {
-			printf(" ");
+		if (symbol_conf.use_callchain && sample->callchain &&
+		    thread__resolve_callchain(al->thread, &cursor_callchain, evsel,
+					      sample, NULL, NULL, scripting_max_stack) == 0)
+			cursor = &cursor_callchain;
+
+		if (cursor == NULL) {
+			putchar(' ');
 			if (print_opts & EVSEL__PRINT_SRCLINE) {
 				print_srcline_last = true;
 				print_opts &= ~EVSEL__PRINT_SRCLINE;
 			}
-		}
-		perf_evsel__fprintf_sym(evsel, sample, al, 0, print_opts,
-					symbol_conf.use_callchain,
-					scripting_max_stack, stdout);
+		} else
+			putchar('\n');
+
+		sample__fprintf_sym(sample, al, 0, print_opts, cursor, stdout);
 	}
 
 	/* print branch_to information */
@@ -784,15 +788,15 @@ static void process_event(struct perf_script *script,
 		printf("%16" PRIu64, sample->weight);
 
 	if (PRINT_FIELD(IP)) {
-		if (!symbol_conf.use_callchain)
-			printf(" ");
-		else
-			printf("\n");
+		struct callchain_cursor *cursor = NULL, cursor_callchain;
+
+		if (symbol_conf.use_callchain &&
+		    thread__resolve_callchain(al->thread, &cursor_callchain, evsel,
+					      sample, NULL, NULL, scripting_max_stack) == 0)
+			cursor = &cursor_callchain;
 
-		perf_evsel__fprintf_sym(evsel, sample, al, 0,
-					output[attr->type].print_ip_opts,
-					symbol_conf.use_callchain,
-					scripting_max_stack, stdout);
+		putchar(cursor ? '\n' : ' ');
+		sample__fprintf_sym(sample, al, 0, output[attr->type].print_ip_opts, cursor, stdout);
 	}
 
 	if (PRINT_FIELD(IREGS))

tools/perf/builtin-trace.c

@@ -1890,14 +1890,16 @@ static int trace__fprintf_callchain(struct trace *trace, struct perf_evsel *evse
 	if (sample->callchain == NULL)
 		return 0;
 
-	if (machine__resolve(trace->host, &al, sample) < 0) {
+	if (machine__resolve(trace->host, &al, sample) < 0 ||
+	    thread__resolve_callchain(al.thread, &callchain_cursor, evsel,
+				      sample, NULL, NULL, scripting_max_stack)) {
 		pr_err("Problem processing %s callchain, skipping...\n",
 			perf_evsel__name(evsel));
 		return 0;
 	}
 
-	return perf_evsel__fprintf_callchain(evsel, sample, &al, 38, print_opts,
-					     scripting_max_stack, trace->output);
+	return sample__fprintf_callchain(sample, &al, 38, print_opts,
+					 &callchain_cursor, trace->output);
 }
 
 static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel,

tools/perf/util/evsel.c

@@ -2343,13 +2343,12 @@ out:
 	return ++printed;
 }
 
-int perf_evsel__fprintf_callchain(struct perf_evsel *evsel, struct perf_sample *sample,
-				  struct addr_location *al, int left_alignment,
-				  unsigned int print_opts, unsigned int stack_depth,
-				  FILE *fp)
+int sample__fprintf_callchain(struct perf_sample *sample,
+			      struct addr_location *al, int left_alignment,
+			      unsigned int print_opts, struct callchain_cursor *cursor,
+			      FILE *fp)
 {
 	int printed = 0;
-	struct callchain_cursor cursor;
 	struct callchain_cursor_node *node;
 	int print_ip = print_opts & EVSEL__PRINT_IP;
 	int print_sym = print_opts & EVSEL__PRINT_SYM;
@@ -2363,22 +2362,15 @@ int perf_evsel__fprintf_callchain(struct perf_evsel *evsel, struct perf_sample *
 	if (sample->callchain) {
 		struct addr_location node_al;
 
-		if (thread__resolve_callchain(al->thread, &cursor, evsel,
-					      sample, NULL, NULL,
-					      stack_depth) != 0) {
-			if (verbose)
-				error("Failed to resolve callchain. Skipping\n");
-			return printed;
-		}
-		callchain_cursor_commit(&cursor);
+		callchain_cursor_commit(cursor);
 
 		if (print_symoffset)
 			node_al = *al;
 
-		while (stack_depth) {
+		while (1) {
 			u64 addr = 0;
 
-			node = callchain_cursor_current(&cursor);
+			node = callchain_cursor_current(cursor);
 			if (!node)
 				break;
 
@@ -2418,20 +2410,17 @@ int perf_evsel__fprintf_callchain(struct perf_evsel *evsel, struct perf_sample *
 
 			if (!print_oneline)
 				printed += fprintf(fp, "\n");
-
-			stack_depth--;
 next:
-			callchain_cursor_advance(&cursor);
+			callchain_cursor_advance(cursor);
 		}
 	}
 
 	return printed;
 }
 
-int perf_evsel__fprintf_sym(struct perf_evsel *evsel, struct perf_sample *sample,
-			    struct addr_location *al, int left_alignment,
-			    unsigned int print_opts, bool print_callchain,
-			    unsigned int stack_depth, FILE *fp)
+int sample__fprintf_sym(struct perf_sample *sample, struct addr_location *al,
+			int left_alignment, unsigned int print_opts,
+			struct callchain_cursor *cursor, FILE *fp)
 {
 	int printed = 0;
 	int print_ip = print_opts & EVSEL__PRINT_IP;
@@ -2441,9 +2430,9 @@ int perf_evsel__fprintf_sym(struct perf_evsel *evsel, struct perf_sample *sample
 	int print_srcline = print_opts & EVSEL__PRINT_SRCLINE;
 	int print_unknown_as_addr = print_opts & EVSEL__PRINT_UNKNOWN_AS_ADDR;
 
-	if (print_callchain && sample->callchain) {
-		printed += perf_evsel__fprintf_callchain(evsel, sample, al, left_alignment,
-							 print_opts, stack_depth, fp);
+	if (cursor != NULL) {
+		printed += sample__fprintf_callchain(sample, al, left_alignment,
+						     print_opts, cursor, fp);
 	} else if (!(al->sym && al->sym->ignore)) {
 		printed += fprintf(fp, "%-*.*s", left_alignment, left_alignment, " ");
 

tools/perf/util/evsel.h

@@ -395,16 +395,15 @@ int perf_evsel__fprintf(struct perf_evsel *evsel,
 #define EVSEL__PRINT_SRCLINE		(1<<5)
 #define EVSEL__PRINT_UNKNOWN_AS_ADDR	(1<<6)
 
-int perf_evsel__fprintf_callchain(struct perf_evsel *evsel,
-				  struct perf_sample *sample,
-				  struct addr_location *al, int left_alignment,
-				  unsigned int print_opts,
-				  unsigned int stack_depth, FILE *fp);
-
-int perf_evsel__fprintf_sym(struct perf_evsel *evsel, struct perf_sample *sample,
-			    struct addr_location *al, int left_alignment,
-			    unsigned int print_opts, bool print_callchain,
-			    unsigned int stack_depth, FILE *fp);
+struct callchain_cursor;
+
+int sample__fprintf_callchain(struct perf_sample *sample, struct addr_location *al,
+			      int left_alignment, unsigned int print_opts,
+			      struct callchain_cursor *cursor, FILE *fp);
+
+int sample__fprintf_sym(struct perf_sample *sample, struct addr_location *al,
+			int left_alignment, unsigned int print_opts,
+			struct callchain_cursor *cursor, FILE *fp);
 
 bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
 			  char *msg, size_t msgsize);