int vframeArrayElement::on_stack_size(int callee_parameters,
int callee_locals,
bool is_top_frame,
int popframe_extra_stack_expression_els) const {
assert(method()->max_locals() == locals()->size(), "just checking");
int locks = monitors() == NULL ? 0 : monitors()->number_of_monitors();
int temps = expressions()->size();
return Interpreter::size_activation(method()->max_stack(),
temps + callee_parameters,
popframe_extra_stack_expression_els,
locks,
callee_parameters,
callee_locals,
is_top_frame);
}
void javaVFrame::print() {
ResourceMark rm;
vframe::print();
tty->print("\t");
method()->print_value();
tty->cr();
tty->print_cr("\tbci: %d", bci());
print_stack_values("locals", locals());
print_stack_values("expressions", expressions());
GrowableArray<MonitorInfo*>* list = monitors();
if (list->is_empty()) return;
tty->print_cr("\tmonitor list:");
for (int index = (list->length()-1); index >= 0; index--) {
MonitorInfo* monitor = list->at(index);
tty->print("\t obj\t");
if (monitor->owner_is_scalar_replaced()) {
Klass* k = java_lang_Class::as_Klass(monitor->owner_klass());
tty->print("( is scalar replaced %s)", k->external_name());
} else if (monitor->owner() == NULL) {
tty->print("( null )");
} else {
monitor->owner()->print_value();
tty->print("(" INTPTR_FORMAT ")", (address)monitor->owner());
}
if (monitor->eliminated() && is_compiled_frame())
tty->print(" ( lock is eliminated )");
tty->cr();
tty->print("\t ");
monitor->lock()->print_on(tty);
tty->cr();
}
}
GrowableArray<MonitorInfo*>* javaVFrame::locked_monitors() {
assert(SafepointSynchronize::is_at_safepoint() || JavaThread::current() == thread(),
"must be at safepoint or it's a java frame of the current thread");
GrowableArray<MonitorInfo*>* mons = monitors();
GrowableArray<MonitorInfo*>* result = new GrowableArray<MonitorInfo*>(mons->length());
if (mons->is_empty()) return result;
bool found_first_monitor = false;
ObjectMonitor *pending_monitor = thread()->current_pending_monitor();
ObjectMonitor *waiting_monitor = thread()->current_waiting_monitor();
oop pending_obj = (pending_monitor != NULL ? (oop) pending_monitor->object() : (oop) NULL);
oop waiting_obj = (waiting_monitor != NULL ? (oop) waiting_monitor->object() : (oop) NULL);
for (int index = (mons->length()-1); index >= 0; index--) {
MonitorInfo* monitor = mons->at(index);
if (monitor->eliminated() && is_compiled_frame()) continue; // skip eliminated monitor
oop obj = monitor->owner();
if (obj == NULL) continue; // skip unowned monitor
//
// Skip the monitor that the thread is blocked to enter or waiting on
//
if (!found_first_monitor && (obj == pending_obj || obj == waiting_obj)) {
continue;
}
found_first_monitor = true;
result->append(monitor);
}
return result;
}
/**
* Load monitors data found in nexus file
*
* @param entry :: The Nexus entry
*
*/
std::vector<std::vector<int>>
LoadILLReflectometry::loadMonitors(NeXus::NXEntry &entry) {
// read in the data
g_log.debug("Fetching monitor data...");
NXData dataGroup = entry.openNXData("monitor1/data");
NXInt data = dataGroup.openIntData();
// load the counts from the file into memory
data.load();
std::vector<std::vector<int>> monitors(
1); // vector of monitors with one entry
std::vector<int> monitor1(data(), data() + data.size());
monitors[0].swap(monitor1);
// There is two monitors in data file, but the second one seems to be always 0
dataGroup = entry.openNXData("monitor2/data");
data = dataGroup.openIntData();
data.load();
std::vector<int> monitor2(data(), data() + data.size());
monitors.push_back(monitor2);
return monitors;
}
void javaVFrame::print_lock_info(int frame_count) {
ResourceMark rm;
// If this is the first frame, and java.lang.Object.wait(...) then print out the receiver.
if (frame_count == 0 && method()->name() == vmSymbols::wait_name() &&
instanceKlass::cast(method()->method_holder())->name() == vmSymbols::java_lang_Object()) {
StackValueCollection* locs = locals();
if (!locs->is_empty()) {
StackValue* sv = locs->at(0);
if (sv->type() == T_OBJECT) {
Handle o = locs->at(0)->get_obj();
if (o.not_null()) {
instanceKlass* ik = instanceKlass::cast(o->klass());
tty->print_cr("\t- waiting on <" INTPTR_FORMAT "> (a %s)", o(), ik->external_name());
}
}
}
}
// Print out all monitors that we have locked or are trying to lock
GrowableArray<MonitorInfo*>* mons = monitors();
if (!mons->is_empty()) {
bool found_first_monitor = false;
for (int index = (mons->length()-1); index >= 0; index--) {
MonitorInfo* monitor = mons->at(index);
if (monitor->owner() != NULL) {
//
// First, assume we have the monitor locked. If we haven't found an
// owned monitor before and this is the first frame, then we need to
// see if the thread is blocked.
//
const char *lock_state = "locked"; // assume we have the monitor locked
if (!found_first_monitor && frame_count == 0) {
switch (thread()->thread_state()) {
case _thread_blocked:
case _thread_blocked_trans:
lock_state = "waiting to lock";
break;
}
}
found_first_monitor = true;
instanceKlass* ik = instanceKlass::cast(monitor->owner()->klass());
tty->print_cr("\t- %s <" INTPTR_FORMAT "> (a %s)", lock_state, monitor->owner(), ik->external_name());
}
}
}
}
/**
* Load monitors data found in nexus file
*
* @param entry :: The Nexus entry
*
*/
std::vector<std::vector<int>>
LoadILLIndirect::loadMonitors(NeXus::NXEntry &entry) {
// read in the data
g_log.debug("Fetching monitor data...");
NXData dataGroup = entry.openNXData("monitor/data");
NXInt data = dataGroup.openIntData();
// load the counts from the file into memory
data.load();
// For the moment, we are aware of only one monitor entry, but we keep the
// generalized case of n monitors
std::vector<std::vector<int>> monitors(1);
std::vector<int> monitor(data(), data() + data.size());
monitors[0].swap(monitor);
return monitors;
}
//
// Count the number of entries for a lightweight monitor. The hobj
// parameter is object that owns the monitor so this routine will
// count the number of times the same object was locked by this
// frame.
//
jint javaVFrame::count_lock_entries(Handle hobj) {
ResourceMark rm;
GrowableArray<MonitorInfo*>* mons = monitors();
if (mons->is_empty()) {
return 0; // this javaVFrame holds no monitors
}
jint ret = 0;
for (int i = 0; i < mons->length(); i++) {
MonitorInfo *mi = mons->at(i);
// see if owner of the monitor is our object
if (mi->owner() != NULL && mi->owner() == hobj()) {
ret++;
}
}
return ret;
}
//
// Fabricate heavyweight monitor information for each lightweight monitor
// found in the Java VFrame.
//
void javaVFrame::jvmpi_fab_heavy_monitors(bool query, int* fab_index, int frame_count, GrowableArray<ObjectMonitor*>* fab_list) {
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
ResourceMark rm;
GrowableArray<MonitorInfo*>* mons = monitors();
if (mons->is_empty()) return;
bool found_first_monitor = false;
for (int index = (mons->length()-1); index >= 0; index--) {
MonitorInfo* monitor = mons->at(index);
if (monitor->owner() == NULL) continue; // skip unowned monitor
//
// If we haven't found a monitor before, this is the first frame, and
// the thread is blocked, then we are trying to enter this monitor.
// We skip it because we have already seen it before from the monitor
// cache walk.
//
if (!found_first_monitor && frame_count == 0) {
switch (thread()->thread_state()) {
case _thread_blocked:
case _thread_blocked_trans:
continue;
}
}
found_first_monitor = true;
markOop mark = monitor->owner()->mark();
if (mark->has_locker()) {
if (!query) { // not just counting so create and store at the current element
// fabricate the heavyweight monitor from lightweight info
ObjectMonitor *heavy = new ObjectMonitor();
heavy->set_object(monitor->owner()); // use the owning object
heavy->set_owner(thread()); // use thread instead of stack address for speed
fab_list->at_put(*fab_index, heavy);
}
(*fab_index)++;
}
}
}
void javaVFrame::print() {
ResourceMark rm;
vframe::print();
tty->print("\t");
method()->print_value();
tty->cr();
tty->print_cr("\tbci: %d", bci());
print_stack_values("locals", locals());
print_stack_values("expressions", expressions());
GrowableArray<MonitorInfo*>* list = monitors();
if (list->is_empty()) return;
tty->print_cr("\tmonitor list:");
for (int index = (list->length()-1); index >= 0; index--) {
MonitorInfo* monitor = list->at(index);
tty->print("\t obj\t"); monitor->owner()->print_value();
tty->print("(" INTPTR_FORMAT ")", monitor->owner());
tty->cr();
tty->print("\t ");
monitor->lock()->print_on(tty);
tty->cr();
}
}
void javaVFrame::print_lock_info_on(outputStream* st, int frame_count) {
ResourceMark rm;
// If this is the first frame, and java.lang.Object.wait(...) then print out the receiver.
if (frame_count == 0) {
if (method()->name() == vmSymbols::wait_name() &&
method()->method_holder()->name() == vmSymbols::java_lang_Object()) {
StackValueCollection* locs = locals();
if (!locs->is_empty()) {
StackValue* sv = locs->at(0);
if (sv->type() == T_OBJECT) {
Handle o = locs->at(0)->get_obj();
print_locked_object_class_name(st, o, "waiting on");
}
}
} else if (thread()->current_park_blocker() != NULL) {
oop obj = thread()->current_park_blocker();
Klass* k = obj->klass();
st->print_cr("\t- %s <" INTPTR_FORMAT "> (a %s)", "parking to wait for ", (address)obj, k->external_name());
}
}
// Print out all monitors that we have locked or are trying to lock
GrowableArray<MonitorInfo*>* mons = monitors();
if (!mons->is_empty()) {
bool found_first_monitor = false;
for (int index = (mons->length()-1); index >= 0; index--) {
MonitorInfo* monitor = mons->at(index);
if (monitor->eliminated() && is_compiled_frame()) { // Eliminated in compiled code
if (monitor->owner_is_scalar_replaced()) {
Klass* k = java_lang_Class::as_Klass(monitor->owner_klass());
st->print("\t- eliminated <owner is scalar replaced> (a %s)", k->external_name());
} else {
oop obj = monitor->owner();
if (obj != NULL) {
print_locked_object_class_name(st, obj, "eliminated");
}
}
continue;
}
if (monitor->owner() != NULL) {
// First, assume we have the monitor locked. If we haven't found an
// owned monitor before and this is the first frame, then we need to
// see if we have completed the lock or we are blocked trying to
// acquire it - we can only be blocked if the monitor is inflated
const char *lock_state = "locked"; // assume we have the monitor locked
if (!found_first_monitor && frame_count == 0) {
markOop mark = monitor->owner()->mark();
if (mark->has_monitor() &&
mark->monitor() == thread()->current_pending_monitor()) {
lock_state = "waiting to lock";
}
}
found_first_monitor = true;
print_locked_object_class_name(st, monitor->owner(), lock_state);
}
}
}
}
// Tells whether the addr point into the monitors.
bool contains(void* addr) const { return (addr >= (void*) monitors()) && (addr < (void*) (monitors() + number_of_monitors())); }
// Returns the index'th monitor
BasicObjectLock* at(int index) { assert(index >= 0 && index < number_of_monitors(), "out of bounds check"); return &monitors()[index]; }
void vframeArrayElement::unpack_on_stack(int caller_actual_parameters,
int callee_parameters,
int callee_locals,
frame* caller,
bool is_top_frame,
bool is_bottom_frame,
int exec_mode) {
JavaThread* thread = (JavaThread*) Thread::current();
// Look at bci and decide on bcp and continuation pc
address bcp;
// C++ interpreter doesn't need a pc since it will figure out what to do when it
// begins execution
address pc;
bool use_next_mdp = false; // true if we should use the mdp associated with the next bci
// rather than the one associated with bcp
if (raw_bci() == SynchronizationEntryBCI) {
// We are deoptimizing while hanging in prologue code for synchronized method
bcp = method()->bcp_from(0); // first byte code
pc = Interpreter::deopt_entry(vtos, 0); // step = 0 since we don't skip current bytecode
} else if (should_reexecute()) { //reexecute this bytecode
assert(is_top_frame, "reexecute allowed only for the top frame");
bcp = method()->bcp_from(bci());
pc = Interpreter::deopt_reexecute_entry(method(), bcp);
} else {
bcp = method()->bcp_from(bci());
pc = Interpreter::deopt_continue_after_entry(method(), bcp, callee_parameters, is_top_frame);
use_next_mdp = true;
}
assert(Bytecodes::is_defined(*bcp), "must be a valid bytecode");
// Monitorenter and pending exceptions:
//
// For Compiler2, there should be no pending exception when deoptimizing at monitorenter
// because there is no safepoint at the null pointer check (it is either handled explicitly
// or prior to the monitorenter) and asynchronous exceptions are not made "pending" by the
// runtime interface for the slow case (see JRT_ENTRY_FOR_MONITORENTER). If an asynchronous
// exception was processed, the bytecode pointer would have to be extended one bytecode beyond
// the monitorenter to place it in the proper exception range.
//
// For Compiler1, deoptimization can occur while throwing a NullPointerException at monitorenter,
// in which case bcp should point to the monitorenter since it is within the exception's range.
assert(*bcp != Bytecodes::_monitorenter || is_top_frame, "a _monitorenter must be a top frame");
assert(thread->deopt_nmethod() != NULL, "nmethod should be known");
guarantee(!(thread->deopt_nmethod()->is_compiled_by_c2() &&
*bcp == Bytecodes::_monitorenter &&
exec_mode == Deoptimization::Unpack_exception),
"shouldn't get exception during monitorenter");
int popframe_preserved_args_size_in_bytes = 0;
int popframe_preserved_args_size_in_words = 0;
if (is_top_frame) {
JvmtiThreadState *state = thread->jvmti_thread_state();
if (JvmtiExport::can_pop_frame() &&
(thread->has_pending_popframe() || thread->popframe_forcing_deopt_reexecution())) {
if (thread->has_pending_popframe()) {
// Pop top frame after deoptimization
#ifndef CC_INTERP
pc = Interpreter::remove_activation_preserving_args_entry();
#else
// Do an uncommon trap type entry. c++ interpreter will know
// to pop frame and preserve the args
pc = Interpreter::deopt_entry(vtos, 0);
use_next_mdp = false;
#endif
} else {
// Reexecute invoke in top frame
pc = Interpreter::deopt_entry(vtos, 0);
use_next_mdp = false;
popframe_preserved_args_size_in_bytes = in_bytes(thread->popframe_preserved_args_size());
// Note: the PopFrame-related extension of the expression stack size is done in
// Deoptimization::fetch_unroll_info_helper
popframe_preserved_args_size_in_words = in_words(thread->popframe_preserved_args_size_in_words());
}
} else if (JvmtiExport::can_force_early_return() && state != NULL && state->is_earlyret_pending()) {
// Force early return from top frame after deoptimization
#ifndef CC_INTERP
pc = Interpreter::remove_activation_early_entry(state->earlyret_tos());
#else
// TBD: Need to implement ForceEarlyReturn for CC_INTERP (ia64)
#endif
} else {
// Possibly override the previous pc computation of the top (youngest) frame
switch (exec_mode) {
case Deoptimization::Unpack_deopt:
// use what we've got
break;
case Deoptimization::Unpack_exception:
// exception is pending
pc = SharedRuntime::raw_exception_handler_for_return_address(thread, pc);
// [phh] We're going to end up in some handler or other, so it doesn't
// matter what mdp we point to. See exception_handler_for_exception()
// in interpreterRuntime.cpp.
break;
case Deoptimization::Unpack_uncommon_trap:
case Deoptimization::Unpack_reexecute:
// redo last byte code
pc = Interpreter::deopt_entry(vtos, 0);
use_next_mdp = false;
break;
default:
ShouldNotReachHere();
}
}
}
// Setup the interpreter frame
assert(method() != NULL, "method must exist");
int temps = expressions()->size();
int locks = monitors() == NULL ? 0 : monitors()->number_of_monitors();
Interpreter::layout_activation(method(),
temps + callee_parameters,
popframe_preserved_args_size_in_words,
locks,
caller_actual_parameters,
callee_parameters,
callee_locals,
caller,
iframe(),
is_top_frame,
is_bottom_frame);
// Update the pc in the frame object and overwrite the temporary pc
// we placed in the skeletal frame now that we finally know the
// exact interpreter address we should use.
_frame.patch_pc(thread, pc);
assert (!method()->is_synchronized() || locks > 0, "synchronized methods must have monitors");
BasicObjectLock* top = iframe()->interpreter_frame_monitor_begin();
for (int index = 0; index < locks; index++) {
top = iframe()->previous_monitor_in_interpreter_frame(top);
BasicObjectLock* src = _monitors->at(index);
top->set_obj(src->obj());
src->lock()->move_to(src->obj(), top->lock());
}
if (ProfileInterpreter) {
iframe()->interpreter_frame_set_mdx(0); // clear out the mdp.
}
iframe()->interpreter_frame_set_bcx((intptr_t)bcp); // cannot use bcp because frame is not initialized yet
if (ProfileInterpreter) {
methodDataOop mdo = method()->method_data();
if (mdo != NULL) {
int bci = iframe()->interpreter_frame_bci();
if (use_next_mdp) ++bci;
address mdp = mdo->bci_to_dp(bci);
iframe()->interpreter_frame_set_mdp(mdp);
}
}
// Unpack expression stack
// If this is an intermediate frame (i.e. not top frame) then this
// only unpacks the part of the expression stack not used by callee
// as parameters. The callee parameters are unpacked as part of the
// callee locals.
int i;
for(i = 0; i < expressions()->size(); i++) {
StackValue *value = expressions()->at(i);
intptr_t* addr = iframe()->interpreter_frame_expression_stack_at(i);
switch(value->type()) {
case T_INT:
*addr = value->get_int();
break;
case T_OBJECT:
*addr = value->get_int(T_OBJECT);
break;
case T_CONFLICT:
// A dead stack slot. Initialize to null in case it is an oop.
*addr = NULL_WORD;
break;
default:
ShouldNotReachHere();
}
}
// Unpack the locals
for(i = 0; i < locals()->size(); i++) {
StackValue *value = locals()->at(i);
intptr_t* addr = iframe()->interpreter_frame_local_at(i);
switch(value->type()) {
case T_INT:
*addr = value->get_int();
break;
case T_OBJECT:
*addr = value->get_int(T_OBJECT);
break;
case T_CONFLICT:
// A dead location. If it is an oop then we need a NULL to prevent GC from following it
*addr = NULL_WORD;
break;
default:
ShouldNotReachHere();
}
}
if (is_top_frame && JvmtiExport::can_pop_frame() && thread->popframe_forcing_deopt_reexecution()) {
// An interpreted frame was popped but it returns to a deoptimized
// frame. The incoming arguments to the interpreted activation
// were preserved in thread-local storage by the
// remove_activation_preserving_args_entry in the interpreter; now
// we put them back into the just-unpacked interpreter frame.
// Note that this assumes that the locals arena grows toward lower
// addresses.
if (popframe_preserved_args_size_in_words != 0) {
void* saved_args = thread->popframe_preserved_args();
assert(saved_args != NULL, "must have been saved by interpreter");
#ifdef ASSERT
assert(popframe_preserved_args_size_in_words <=
iframe()->interpreter_frame_expression_stack_size()*Interpreter::stackElementWords,
"expression stack size should have been extended");
#endif // ASSERT
int top_element = iframe()->interpreter_frame_expression_stack_size()-1;
intptr_t* base;
if (frame::interpreter_frame_expression_stack_direction() < 0) {
base = iframe()->interpreter_frame_expression_stack_at(top_element);
} else {
base = iframe()->interpreter_frame_expression_stack();
}
Copy::conjoint_jbytes(saved_args,
base,
popframe_preserved_args_size_in_bytes);
thread->popframe_free_preserved_args();
}
}
#ifndef PRODUCT
if (TraceDeoptimization && Verbose) {
ttyLocker ttyl;
tty->print_cr("[%d Interpreted Frame]", ++unpack_counter);
iframe()->print_on(tty);
RegisterMap map(thread);
vframe* f = vframe::new_vframe(iframe(), &map, thread);
f->print();
tty->print_cr("locals size %d", locals()->size());
tty->print_cr("expression size %d", expressions()->size());
method()->print_value();
tty->cr();
// method()->print_codes();
} else if (TraceDeoptimization) {
tty->print(" ");
method()->print_value();
Bytecodes::Code code = Bytecodes::java_code_at(method(), bcp);
int bci = method()->bci_from(bcp);
tty->print(" - %s", Bytecodes::name(code));
tty->print(" @ bci %d ", bci);
tty->print_cr("sp = " PTR_FORMAT, iframe()->sp());
}
#endif // PRODUCT
// The expression stack and locals are in the resource area don't leave
// a dangling pointer in the vframeArray we leave around for debug
// purposes
_locals = _expressions = NULL;
}
MonitorChunk::~MonitorChunk() {
FreeHeap(monitors());
}
// Save global JNI handles for any objects that this thread owns.
void javaVFrame::save_lock_entries(GrowableArray<jobject>* handle_list) {
ResourceMark rm;
GrowableArray<MonitorInfo*>* mons = monitors();
if (mons->is_empty()) {
return; // this javaVFrame holds no monitors
}
HandleMark hm;
oop wait_obj = NULL;
{
// save object of current wait() call (if any) for later comparison
ObjectMonitor *mon = thread()->current_waiting_monitor();
if (mon != NULL) {
wait_obj = (oop)mon->object();
}
}
oop pending_obj = NULL;
{
// save object of current enter() call (if any) for later comparison
ObjectMonitor *mon = thread()->current_pending_monitor();
if (mon != NULL) {
pending_obj = (oop)mon->object();
}
}
for (int i = 0; i < mons->length(); i++) {
MonitorInfo *mi = mons->at(i);
oop obj = mi->owner();
if (obj == NULL) {
// this monitor doesn't have an owning object so skip it
continue;
}
if (wait_obj == obj) {
// the thread is waiting on this monitor so it isn't really owned
continue;
}
if (pending_obj == obj) {
// the thread is pending on this monitor so it isn't really owned
continue;
}
if (handle_list->length() > 0) {
// Our list has at least one object on it so we have to check
// for recursive object locking
bool found = false;
for (int j = 0; j < handle_list->length(); j++) {
jobject jobj = handle_list->at(j);
oop check = JNIHandles::resolve(jobj);
if (check == obj) {
found = true; // we found the object
break;
}
}
if (found) {
// already have this object so don't include it
continue;
}
}
// add the owning object to our list
Handle hobj(obj);
jobject jobj = (jobject)JNIHandles::make_global(hobj);
handle_list->append(jobj);
}
}
