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Message-Id: <1477326057-24080-18-git-send-email-acme@kernel.org>
Date: Mon, 24 Oct 2016 13:20:37 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ingo Molnar <mingo@...nel.org>
Cc: linux-kernel@...r.kernel.org,
Stephane Eranian <eranian@...gle.com>,
Anton Blanchard <anton@...abs.org>,
Jiri Olsa <jolsa@...hat.com>,
Namhyung Kim <namhyung@...nel.org>,
Nilay Vaish <nilayvaish@...il.com>,
Peter Zijlstra <peterz@...radead.org>,
Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 17/37] perf jit: Improve error messages from JVMTI
From: Stephane Eranian <eranian@...gle.com>
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@...gle.com>
Cc: Anton Blanchard <anton@...abs.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Nilay Vaish <nilayvaish@...il.com>
Cc: Peter Zijlstra <peterz@...radead.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@...hat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/perf/jvmti/libjvmti.c | 39 +++++++++++++++++++++++++++++----------
1 file 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;
--
2.7.4
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