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authorStephane Eranian <eranian@google.com>2016-10-13 03:59:35 -0700
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-10-24 11:07:37 -0300
commitcdd75e3b0d1e668bc498f18f0ea8353f9f955114 (patch)
tree51915eb6423a74ee333c2f06f4533015d4fc1232 /tools/perf/jvmti
parent5fef5f3f096d4852d63239836d0e57a0861f9b73 (diff)
downloadlinux-cdd75e3b0d1e668bc498f18f0ea8353f9f955114.tar.bz2
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: Stephane 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: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/jvmti')
-rw-r--r--tools/perf/jvmti/libjvmti.c39
1 files changed, 29 insertions, 10 deletions
diff --git a/tools/perf/jvmti/libjvmti.c b/tools/perf/jvmti/libjvmti.c
index ac12e4b91a92..5612641c69b4 100644
--- a/tools/perf/jvmti/libjvmti.c
+++ b/tools/perf/jvmti/libjvmti.c
@@ -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;