void ZeroStack::handle_overflow(TRAPS) {
JavaThread *thread = (JavaThread *) THREAD;
// Set up the frame anchor if it isn't already
bool has_last_Java_frame = thread->has_last_Java_frame();
if (!has_last_Java_frame) {
intptr_t *sp = thread->zero_stack()->sp();
ZeroFrame *frame = thread->top_zero_frame();
while (frame) {
if (frame->is_shark_frame())
break;
if (frame->is_interpreter_frame()) {
interpreterState istate =
frame->as_interpreter_frame()->interpreter_state();
if (istate->self_link() == istate)
break;
}
sp = ((intptr_t *) frame) + 1;
frame = frame->next();
}
if (frame == NULL)
fatal("unrecoverable stack overflow");
thread->set_last_Java_frame(frame, sp);
}
// Throw the exception
switch (thread->thread_state()) {
case _thread_in_Java:
InterpreterRuntime::throw_StackOverflowError(thread);
break;
case _thread_in_vm:
Exceptions::throw_stack_overflow_exception(thread, __FILE__, __LINE__,
methodHandle());
break;
default:
ShouldNotReachHere();
}
// Reset the frame anchor if necessary
if (!has_last_Java_frame)
thread->reset_last_Java_frame();
}
void CppInterpreter::main_loop(int recurse, TRAPS) {
JavaThread *thread = (JavaThread *) THREAD;
ZeroStack *stack = thread->zero_stack();
// If we are entering from a deopt we may need to call
// ourself a few times in order to get to our frame.
if (recurse)
main_loop(recurse - 1, THREAD);
InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame();
interpreterState istate = frame->interpreter_state();
methodOop method = istate->method();
intptr_t *result = NULL;
int result_slots = 0;
while (true) {
// We can set up the frame anchor with everything we want at
// this point as we are thread_in_Java and no safepoints can
// occur until we go to vm mode. We do have to clear flags
// on return from vm but that is it.
thread->set_last_Java_frame();
// Call the interpreter
if (JvmtiExport::can_post_interpreter_events())
BytecodeInterpreter::runWithChecks(istate);
else
BytecodeInterpreter::run(istate);
fixup_after_potential_safepoint();
// Clear the frame anchor
thread->reset_last_Java_frame();
// Examine the message from the interpreter to decide what to do
if (istate->msg() == BytecodeInterpreter::call_method) {
methodOop callee = istate->callee();
// Trim back the stack to put the parameters at the top
stack->set_sp(istate->stack() + 1);
// Make the call
Interpreter::invoke_method(callee, istate->callee_entry_point(), THREAD);
fixup_after_potential_safepoint();
// Convert the result
istate->set_stack(stack->sp() - 1);
// Restore the stack
stack->set_sp(istate->stack_limit() + 1);
// Resume the interpreter
istate->set_msg(BytecodeInterpreter::method_resume);
}
else if (istate->msg() == BytecodeInterpreter::more_monitors) {
int monitor_words = frame::interpreter_frame_monitor_size();
// Allocate the space
stack->overflow_check(monitor_words, THREAD);
if (HAS_PENDING_EXCEPTION)
break;
stack->alloc(monitor_words * wordSize);
// Move the expression stack contents
for (intptr_t *p = istate->stack() + 1; p < istate->stack_base(); p++)
*(p - monitor_words) = *p;
// Move the expression stack pointers
istate->set_stack_limit(istate->stack_limit() - monitor_words);
istate->set_stack(istate->stack() - monitor_words);
istate->set_stack_base(istate->stack_base() - monitor_words);
// Zero the new monitor so the interpreter can find it.
((BasicObjectLock *) istate->stack_base())->set_obj(NULL);
// Resume the interpreter
istate->set_msg(BytecodeInterpreter::got_monitors);
}
else if (istate->msg() == BytecodeInterpreter::return_from_method) {
// Copy the result into the caller's frame
result_slots = type2size[result_type_of(method)];
assert(result_slots >= 0 && result_slots <= 2, "what?");
result = istate->stack() + result_slots;
break;
}
else if (istate->msg() == BytecodeInterpreter::throwing_exception) {
assert(HAS_PENDING_EXCEPTION, "should do");
break;
}
else if (istate->msg() == BytecodeInterpreter::do_osr) {
// Unwind the current frame
thread->pop_zero_frame();
// Remove any extension of the previous frame
int extra_locals = method->max_locals() - method->size_of_parameters();
stack->set_sp(stack->sp() + extra_locals);
// Jump into the OSR method
Interpreter::invoke_osr(
method, istate->osr_entry(), istate->osr_buf(), THREAD);
return;
}
else {
ShouldNotReachHere();
}
}
// Unwind the current frame
thread->pop_zero_frame();
// Pop our local variables
stack->set_sp(stack->sp() + method->max_locals());
// Push our result
for (int i = 0; i < result_slots; i++)
stack->push(result[-i]);
}
int CppInterpreter::native_entry(methodOop method, intptr_t UNUSED, TRAPS) {
// Make sure method is native and not abstract
assert(method->is_native() && !method->is_abstract(), "should be");
JavaThread *thread = (JavaThread *) THREAD;
ZeroStack *stack = thread->zero_stack();
// Allocate and initialize our frame
InterpreterFrame *frame = InterpreterFrame::build(method, CHECK_0);
thread->push_zero_frame(frame);
interpreterState istate = frame->interpreter_state();
intptr_t *locals = istate->locals();
// Update the invocation counter
if ((UseCompiler || CountCompiledCalls) && !method->is_synchronized()) {
InvocationCounter *counter = method->invocation_counter();
counter->increment();
if (counter->reached_InvocationLimit()) {
CALL_VM_NOCHECK(
InterpreterRuntime::frequency_counter_overflow(thread, NULL));
if (HAS_PENDING_EXCEPTION)
goto unwind_and_return;
}
}
// Lock if necessary
BasicObjectLock *monitor;
monitor = NULL;
if (method->is_synchronized()) {
monitor = (BasicObjectLock*) istate->stack_base();
oop lockee = monitor->obj();
markOop disp = lockee->mark()->set_unlocked();
monitor->lock()->set_displaced_header(disp);
if (Atomic::cmpxchg_ptr(monitor, lockee->mark_addr(), disp) != disp) {
if (thread->is_lock_owned((address) disp->clear_lock_bits())) {
monitor->lock()->set_displaced_header(NULL);
}
else {
CALL_VM_NOCHECK(InterpreterRuntime::monitorenter(thread, monitor));
if (HAS_PENDING_EXCEPTION)
goto unwind_and_return;
}
}
}
// Get the signature handler
InterpreterRuntime::SignatureHandler *handler; {
address handlerAddr = method->signature_handler();
if (handlerAddr == NULL) {
CALL_VM_NOCHECK(InterpreterRuntime::prepare_native_call(thread, method));
if (HAS_PENDING_EXCEPTION)
goto unlock_unwind_and_return;
handlerAddr = method->signature_handler();
assert(handlerAddr != NULL, "eh?");
}
if (handlerAddr == (address) InterpreterRuntime::slow_signature_handler) {
CALL_VM_NOCHECK(handlerAddr =
InterpreterRuntime::slow_signature_handler(thread, method, NULL,NULL));
if (HAS_PENDING_EXCEPTION)
goto unlock_unwind_and_return;
}
handler = \
InterpreterRuntime::SignatureHandler::from_handlerAddr(handlerAddr);
}
// Get the native function entry point
address function;
function = method->native_function();
assert(function != NULL, "should be set if signature handler is");
// Build the argument list
stack->overflow_check(handler->argument_count() * 2, THREAD);
if (HAS_PENDING_EXCEPTION)
goto unlock_unwind_and_return;
void **arguments;
void *mirror; {
arguments =
(void **) stack->alloc(handler->argument_count() * sizeof(void **));
void **dst = arguments;
void *env = thread->jni_environment();
*(dst++) = &env;
if (method->is_static()) {
istate->set_oop_temp(
method->constants()->pool_holder()->java_mirror());
mirror = istate->oop_temp_addr();
*(dst++) = &mirror;
}
intptr_t *src = locals;
for (int i = dst - arguments; i < handler->argument_count(); i++) {
ffi_type *type = handler->argument_type(i);
if (type == &ffi_type_pointer) {
if (*src) {
stack->push((intptr_t) src);
*(dst++) = stack->sp();
}
else {
*(dst++) = src;
}
src--;
}
else if (type->size == 4) {
*(dst++) = src--;
}
else if (type->size == 8) {
src--;
*(dst++) = src--;
}
else {
ShouldNotReachHere();
}
}
}
// Set up the Java frame anchor
thread->set_last_Java_frame();
// Change the thread state to _thread_in_native
ThreadStateTransition::transition_from_java(thread, _thread_in_native);
// Make the call
intptr_t result[4 - LogBytesPerWord];
ffi_call(handler->cif(), (void (*)()) function, result, arguments);
// Change the thread state back to _thread_in_Java.
// ThreadStateTransition::transition_from_native() cannot be used
// here because it does not check for asynchronous exceptions.
// We have to manage the transition ourself.
thread->set_thread_state(_thread_in_native_trans);
// Make sure new state is visible in the GC thread
if (os::is_MP()) {
if (UseMembar) {
OrderAccess::fence();
}
else {
InterfaceSupport::serialize_memory(thread);
}
}
// Handle safepoint operations, pending suspend requests,
// and pending asynchronous exceptions.
if (SafepointSynchronize::do_call_back() ||
thread->has_special_condition_for_native_trans()) {
JavaThread::check_special_condition_for_native_trans(thread);
CHECK_UNHANDLED_OOPS_ONLY(thread->clear_unhandled_oops());
}
// Finally we can change the thread state to _thread_in_Java.
thread->set_thread_state(_thread_in_Java);
fixup_after_potential_safepoint();
// Clear the frame anchor
thread->reset_last_Java_frame();
// If the result was an oop then unbox it and store it in
// oop_temp where the garbage collector can see it before
// we release the handle it might be protected by.
if (handler->result_type() == &ffi_type_pointer) {
if (result[0])
istate->set_oop_temp(*(oop *) result[0]);
else
istate->set_oop_temp(NULL);
}
// Reset handle block
thread->active_handles()->clear();
unlock_unwind_and_return:
// Unlock if necessary
if (monitor) {
BasicLock *lock = monitor->lock();
markOop header = lock->displaced_header();
oop rcvr = monitor->obj();
monitor->set_obj(NULL);
if (header != NULL) {
if (Atomic::cmpxchg_ptr(header, rcvr->mark_addr(), lock) != lock) {
monitor->set_obj(rcvr); {
HandleMark hm(thread);
CALL_VM_NOCHECK(InterpreterRuntime::monitorexit(thread, monitor));
}
}
}
}
unwind_and_return:
// Unwind the current activation
thread->pop_zero_frame();
// Pop our parameters
stack->set_sp(stack->sp() + method->size_of_parameters());
// Push our result
if (!HAS_PENDING_EXCEPTION) {
BasicType type = result_type_of(method);
stack->set_sp(stack->sp() - type2size[type]);
switch (type) {
case T_VOID:
break;
case T_BOOLEAN:
#ifndef VM_LITTLE_ENDIAN
result[0] <<= (BitsPerWord - BitsPerByte);
#endif
SET_LOCALS_INT(*(jboolean *) result != 0, 0);
break;
case T_CHAR:
#ifndef VM_LITTLE_ENDIAN
result[0] <<= (BitsPerWord - BitsPerShort);
#endif
SET_LOCALS_INT(*(jchar *) result, 0);
break;
case T_BYTE:
#ifndef VM_LITTLE_ENDIAN
result[0] <<= (BitsPerWord - BitsPerByte);
#endif
SET_LOCALS_INT(*(jbyte *) result, 0);
break;
case T_SHORT:
#ifndef VM_LITTLE_ENDIAN
result[0] <<= (BitsPerWord - BitsPerShort);
#endif
SET_LOCALS_INT(*(jshort *) result, 0);
break;
case T_INT:
#ifndef VM_LITTLE_ENDIAN
result[0] <<= (BitsPerWord - BitsPerInt);
#endif
SET_LOCALS_INT(*(jint *) result, 0);
break;
case T_LONG:
SET_LOCALS_LONG(*(jlong *) result, 0);
break;
case T_FLOAT:
SET_LOCALS_FLOAT(*(jfloat *) result, 0);
break;
case T_DOUBLE:
SET_LOCALS_DOUBLE(*(jdouble *) result, 0);
break;
case T_OBJECT:
case T_ARRAY:
SET_LOCALS_OBJECT(istate->oop_temp(), 0);
break;
default:
ShouldNotReachHere();
}
}
// No deoptimized frames on the stack
return 0;
}