jvmtiError VM_RedefineClasses::load_new_class_versions(TRAPS) {
// For consistency allocate memory using os::malloc wrapper.
_k_h_new = (instanceKlassHandle *) os::malloc(sizeof(instanceKlassHandle) * _class_count);
ResourceMark rm(THREAD);
JvmtiThreadState *state = JavaThread::current()->jvmti_thread_state();
assert(state != NULL, "JvmtiThreadState not initialized");
for (int i = 0; i < _class_count; i++) {
oop mirror = JNIHandles::resolve_non_null(_class_defs[i].klass);
klassOop k_oop = java_lang_Class::as_klassOop(mirror);
instanceKlassHandle k_h = instanceKlassHandle(THREAD, k_oop);
symbolHandle k_name = symbolHandle(THREAD, k_h->name());
ClassFileStream st((u1*) _class_defs[i].class_bytes,
_class_defs[i].class_byte_count, (char *)"__VM_RedefineClasses__");
// Parse the stream.
Handle k_loader_h(THREAD, k_h->class_loader());
Handle protection_domain;
// Set redefined class handle in JvmtiThreadState class.
// This redefined class is sent to agent event handler for class file
// load hook event.
state->set_class_being_redefined(&k_h);
klassOop k = SystemDictionary::parse_stream(k_name,
k_loader_h,
protection_domain,
&st,
THREAD);
// Clear class_being_redefined just to be sure.
state->set_class_being_redefined(NULL);
instanceKlassHandle k_h_new (THREAD, k);
if (HAS_PENDING_EXCEPTION) {
symbolOop ex_name = PENDING_EXCEPTION->klass()->klass_part()->name();
CLEAR_PENDING_EXCEPTION;
if (ex_name == vmSymbols::java_lang_UnsupportedClassVersionError()) {
return JVMTI_ERROR_UNSUPPORTED_VERSION;
} else if (ex_name == vmSymbols::java_lang_ClassFormatError()) {
return JVMTI_ERROR_INVALID_CLASS_FORMAT;
} else if (ex_name == vmSymbols::java_lang_ClassCircularityError()) {
return JVMTI_ERROR_CIRCULAR_CLASS_DEFINITION;
} else if (ex_name == vmSymbols::java_lang_NoClassDefFoundError()) {
// The message will be "XXX (wrong name: YYY)"
return JVMTI_ERROR_NAMES_DONT_MATCH;
} else { // Just in case more exceptions can be thrown..
return JVMTI_ERROR_FAILS_VERIFICATION;
}
}
// All its super classes should be linked to
// initialize the vtable.
instanceKlassHandle super(THREAD, k_h_new->super());
if (super.not_null() && !super->is_linked()) {
super->link_class(THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
return JVMTI_ERROR_INTERNAL;
}
}
// See instanceKlass::link_klass_impl()
{ ObjectLocker ol(k_h_new, THREAD);
Verifier::verify_byte_codes(k_h_new, THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
return JVMTI_ERROR_FAILS_VERIFICATION;
}
Rewriter::rewrite(k_h_new, THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
return JVMTI_ERROR_INTERNAL;
}
}
jvmtiError res = compare_class_versions(k_h, k_h_new);
if (res != JVMTI_ERROR_NONE) return res;
_k_h_new[i] = k_h_new;
}
return JVMTI_ERROR_NONE;
}
jvmdiError load_new_class_versions(TRAPS) {
// For consistency allocate memory using os::malloc wrapper.
_k_h_new = (instanceKlassHandle *) os::malloc(sizeof(instanceKlassHandle) * _class_count);
ResourceMark rm(THREAD);
for (int i = 0; i < _class_count; i++) {
oop mirror = JNIHandles::resolve_non_null(_class_defs[i].clazz);
klassOop k_oop = java_lang_Class::as_klassOop(mirror);
instanceKlassHandle k_h = instanceKlassHandle(THREAD, k_oop);
symbolHandle k_name = symbolHandle(THREAD, k_h->name());
ClassFileStream st((u1*) _class_defs[i].class_bytes, _class_defs[i].class_byte_count, NULL);
// Parse the stream.
Handle k_loader_h(THREAD, k_h->class_loader());
Handle protection_domain;
klassOop k = SystemDictionary::parse_stream(k_name,
k_loader_h,
protection_domain,
&st,
THREAD);
instanceKlassHandle k_h_new (THREAD, k);
if (HAS_PENDING_EXCEPTION) {
if (PENDING_EXCEPTION->klass()->klass_part()->name() ==
vmSymbols::java_lang_UnsupportedClassVersionError()) {
CLEAR_PENDING_EXCEPTION;
return JVMDI_ERROR_UNSUPPORTED_VERSION;
} else if (PENDING_EXCEPTION->klass()->klass_part()->name() ==
vmSymbols::java_lang_ClassFormatError()) {
CLEAR_PENDING_EXCEPTION;
return JVMDI_ERROR_INVALID_CLASS_FORMAT;
} else if (PENDING_EXCEPTION->klass()->klass_part()->name() ==
vmSymbols::java_lang_ClassCircularityError()) {
CLEAR_PENDING_EXCEPTION;
return JVMDI_ERROR_CIRCULAR_CLASS_DEFINITION;
} else if (PENDING_EXCEPTION->klass()->klass_part()->name() ==
vmSymbols::java_lang_NoClassDefFoundError()) {
// The message will be "XXX (wrong name: YYY)"
CLEAR_PENDING_EXCEPTION;
return JVMDI_ERROR_NAMES_DONT_MATCH;
} else { // Just in case more exceptions can be thrown..
return JVMDI_ERROR_FAILS_VERIFICATION;
}
}
// See instanceKlass::link_klass_impl()
{ ObjectLocker ol(k_h_new, THREAD);
Verifier::verify_byte_codes(k_h_new, THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
return JVMDI_ERROR_FAILS_VERIFICATION;
}
Rewriter::rewrite(k_h_new, THREAD); // No exception can happen here
}
jvmdiError res = compare_class_versions(k_h, k_h_new);
if (res != JVMDI_ERROR_NONE) return res;
_k_h_new[i] = k_h_new;
}
return JVMDI_ERROR_NONE;
}