Commit cdd75e3b authored by Stephane Eranian's avatar Stephane Eranian Committed by Arnaldo Carvalho de Melo
Browse files

perf jit: Improve error messages from JVMTI 



This patch improves the usefulness of error messages generated by the
JVMTI interfac.e This can help identify the root cause of a problem by
printing the actual error code. The patch adds a new helper function
called print_error().

Signed-off-by: default avatarStephane Eranian <eranian@google.com>
Cc: Anton Blanchard <anton@ozlabs.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nilay Vaish <nilayvaish@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1476356383-30100-2-git-send-email-eranian@google.com


[ Handle failure to convert numeric error to a string in print_error() ]
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 5fef5f3f

tools/perf/jvmti/libjvmti.c

+29 −10
Original line number Diff line number Diff line
@@ -12,6 +12,19 @@ 
static int has_line_numbers;

void *jvmti_agent;



static void print_error(jvmtiEnv *jvmti, const char *msg, jvmtiError ret)

{

	char *err_msg = NULL;

	jvmtiError err;

	err = (*jvmti)->GetErrorName(jvmti, ret, &err_msg);

	if (err == JVMTI_ERROR_NONE) {

		warnx("%s failed with %s", msg, err_msg);

		(*jvmti)->Deallocate(jvmti, (unsigned char *)err_msg);

	} else {

		warnx("%s failed with an unknown error %d", msg, ret);

	}

}



static jvmtiError

do_get_line_numbers(jvmtiEnv *jvmti, void *pc, jmethodID m, jint bci,

		    jvmti_line_info_t *tab, jint *nr)
@@ -22,8 +35,10 @@ do_get_line_numbers(jvmtiEnv *jvmti, void *pc, jmethodID m, jint bci, 
	jvmtiError ret;



	ret = (*jvmti)->GetLineNumberTable(jvmti, m, &nr_lines, &loc_tab);

	if (ret != JVMTI_ERROR_NONE)

	if (ret != JVMTI_ERROR_NONE) {

		print_error(jvmti, "GetLineNumberTable", ret);

		return ret;

	}



	for (i = 0; i < nr_lines; i++) {

		if (loc_tab[i].start_location < bci) {
@@ -71,6 +86,8 @@ get_line_numbers(jvmtiEnv *jvmti, const void *compile_info, jvmti_line_info_t ** 
					/* free what was allocated for nothing */

					(*jvmti)->Deallocate(jvmti, (unsigned char *)lne);

					nr_total += (int)nr;

				} else {

					print_error(jvmti, "GetLineNumberTable", ret);

				}

			}

		}
@@ -130,7 +147,7 @@ compiled_method_load_cb(jvmtiEnv *jvmti, 
	ret = (*jvmti)->GetMethodDeclaringClass(jvmti, method,

						&decl_class);

	if (ret != JVMTI_ERROR_NONE) {

		warnx("jvmti: cannot get declaring class");

		print_error(jvmti, "GetMethodDeclaringClass", ret);

		return;

	}
@@ -144,21 +161,21 @@ compiled_method_load_cb(jvmtiEnv *jvmti, 


	ret = (*jvmti)->GetSourceFileName(jvmti, decl_class, &file_name);

	if (ret != JVMTI_ERROR_NONE) {

		warnx("jvmti: cannot get source filename ret=%d", ret);

		print_error(jvmti, "GetSourceFileName", ret);

		goto error;

	}



	ret = (*jvmti)->GetClassSignature(jvmti, decl_class,

					  &class_sign, NULL);

	if (ret != JVMTI_ERROR_NONE) {

		warnx("jvmti: getclassignature failed");

		print_error(jvmti, "GetClassSignature", ret);

		goto error;

	}



	ret = (*jvmti)->GetMethodName(jvmti, method, &func_name,

				      &func_sign, NULL);

	if (ret != JVMTI_ERROR_NONE) {

		warnx("jvmti: failed getmethodname");

		print_error(jvmti, "GetMethodName", ret);

		goto error;

	}
@@ -253,7 +270,7 @@ Agent_OnLoad(JavaVM *jvm, char *options, void *reserved __unused) 


	ret = (*jvmti)->AddCapabilities(jvmti, &caps1);

	if (ret != JVMTI_ERROR_NONE) {

		warnx("jvmti: acquire compiled_method capability failed");

		print_error(jvmti, "AddCapabilities", ret);

		return -1;

	}

	ret = (*jvmti)->GetJLocationFormat(jvmti, &format);
@@ -264,7 +281,9 @@ Agent_OnLoad(JavaVM *jvm, char *options, void *reserved __unused) 
		ret = (*jvmti)->AddCapabilities(jvmti, &caps1);

                if (ret == JVMTI_ERROR_NONE)

                        has_line_numbers = 1;

        }

        } else if (ret != JVMTI_ERROR_NONE)

		print_error(jvmti, "GetJLocationFormat", ret);





	memset(&cb, 0, sizeof(cb));
@@ -273,21 +292,21 @@ Agent_OnLoad(JavaVM *jvm, char *options, void *reserved __unused) 


	ret = (*jvmti)->SetEventCallbacks(jvmti, &cb, sizeof(cb));

	if (ret != JVMTI_ERROR_NONE) {

		warnx("jvmti: cannot set event callbacks");

		print_error(jvmti, "SetEventCallbacks", ret);

		return -1;

	}



	ret = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,

			JVMTI_EVENT_COMPILED_METHOD_LOAD, NULL);

	if (ret != JVMTI_ERROR_NONE) {

		warnx("jvmti: setnotification failed for method_load");

		print_error(jvmti, "SetEventNotificationMode(METHOD_LOAD)", ret);

		return -1;

	}



	ret = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,

			JVMTI_EVENT_DYNAMIC_CODE_GENERATED, NULL);

	if (ret != JVMTI_ERROR_NONE) {

		warnx("jvmti: setnotification failed on code_generated");

		print_error(jvmti, "SetEventNotificationMode(CODE_GENERATED)", ret);

		return -1;

	}

	return 0;

CRA Git | Maintained and supported by SUSTech CRA and CCSE