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6603316: Improve instrumentation for classes loaded at startup

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Reviewed-by: xlu, mchung
This commit is contained in:
Karen Kinnear 2009-03-25 13:09:28 -04:00
parent 472349069b
commit 101468324d
4 changed files with 37 additions and 9 deletions
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26
hotspot/src/share/vm/prims/jvm.cpp
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@ -64,6 +64,7 @@ static void trace_class_resolution_impl(klassOop to_class, TRAPS) {
ResourceMark rm;
int line_number = -1;
const char * source_file = NULL;
const char * trace = "explicit";
klassOop caller = NULL;
JavaThread* jthread = JavaThread::current();
if (jthread->has_last_Java_frame()) {
@ -107,12 +108,21 @@ static void trace_class_resolution_impl(klassOop to_class, TRAPS) {
(last_caller->name() == vmSymbols::loadClassInternal_name() ||
last_caller->name() == vmSymbols::loadClass_name())) {
found_it = true;
} else if (!vfst.at_end()) {
if (vfst.method()->is_native()) {
// JNI call
found_it = true;
}
}
if (found_it && !vfst.at_end()) {
// found the caller
caller = vfst.method()->method_holder();
line_number = vfst.method()->line_number_from_bci(vfst.bci());
symbolOop s = instanceKlass::cast(vfst.method()->method_holder())->source_file_name();
if (line_number == -1) {
// show method name if it's a native method
trace = vfst.method()->name_and_sig_as_C_string();
}
symbolOop s = instanceKlass::cast(caller)->source_file_name();
if (s != NULL) {
source_file = s->as_C_string();
}
@ -124,15 +134,15 @@ static void trace_class_resolution_impl(klassOop to_class, TRAPS) {
const char * to = Klass::cast(to_class)->external_name();
// print in a single call to reduce interleaving between threads
if (source_file != NULL) {
tty->print("RESOLVE %s %s %s:%d (explicit)\n", from, to, source_file, line_number);
tty->print("RESOLVE %s %s %s:%d (%s)\n", from, to, source_file, line_number, trace);
} else {
tty->print("RESOLVE %s %s (explicit)\n", from, to);
tty->print("RESOLVE %s %s (%s)\n", from, to, trace);
}
}
}
}
static void trace_class_resolution(klassOop to_class) {
void trace_class_resolution(klassOop to_class) {
EXCEPTION_MARK;
trace_class_resolution_impl(to_class, THREAD);
if (HAS_PENDING_EXCEPTION) {
@ -3213,8 +3223,12 @@ JVM_ENTRY(jclass, JVM_LoadClass0(JNIEnv *env, jobject receiver,
}
Handle h_loader(THREAD, loader);
Handle h_prot (THREAD, protection_domain);
return find_class_from_class_loader(env, name, true, h_loader, h_prot,
false, thread);
jclass result = find_class_from_class_loader(env, name, true, h_loader, h_prot,
false, thread);
if (TraceClassResolution && result != NULL) {
trace_class_resolution(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(result)));
}
return result;
JVM_END