void trace(methodOop method, address bcp, uintptr_t tos, uintptr_t tos2) {
#ifndef PRODUCT
MutexLocker ml(BytecodeTrace_lock);
if (_current_method != method) {
// Note 1: This code will not work as expected with true MT/MP.
// Need an explicit lock or a different solution.
ResourceMark rm;
tty->cr();
tty->print("[%d] ", (int) Thread::current()->osthread()->thread_id());
method->print_name(tty);
tty->cr();
_current_method = method;
}
if (Verbose) {
const char* format;
switch (Bytecodes::length_at(bcp)) {
case 1: format = "%x %02x " ; break;
case 2: format = "%x %02x %02x " ; break;
case 3: format = "%x %02x %02x %02x "; break;
default: format = "%x %02x %02x %02x .."; break;
}
tty->print(format, bcp, *bcp, *(bcp+1), *(bcp+2));
}
Bytecodes::Code code;
if (_previous_bytecode == Bytecodes::_wide) {
code = Bytecodes::cast(*(bcp+1));
} else {
code = Bytecodes::cast(*bcp);
}
int bci = bcp - method->code_base();
const char* format = _previous_bytecode == Bytecodes::_wide ? Bytecodes::wide_format(code) : Bytecodes::format(code);
tty->print("[%d] ", (int) Thread::current()->osthread()->thread_id());
if (Verbose) {
tty->print("%8d %4d 0x%016lx 0x%016lx %s",
BytecodeCounter::counter_value(), bci, tos, tos2, Bytecodes::name(code));
} else {
tty->print("%8d %4d %s",
BytecodeCounter::counter_value(), bci, Bytecodes::name(code));
}
print_attributes(bcp, bci, format);
tty->cr();
_previous_bytecode = code;
#endif
}
// Given that a new (potential) event has come in,
// maintain the current JVMTI location on a per-thread per-env basis
// and use it to filter out duplicate events:
// - instruction rewrites
// - breakpoint followed by single step
// - single step at a breakpoint
void JvmtiEnvThreadState::compare_and_set_current_location(methodOop new_method,
address new_location, jvmtiEvent event) {
int new_bci = new_location - new_method->code_base();
// The method is identified and stored as a jmethodID which is safe in this
// case because the class cannot be unloaded while a method is executing.
jmethodID new_method_id = new_method->jmethod_id();
// the last breakpoint or single step was at this same location
if (_current_bci == new_bci && _current_method_id == new_method_id) {
switch (event) {
case JVMTI_EVENT_BREAKPOINT:
// Repeat breakpoint is complicated. If we previously posted a breakpoint
// event at this location and if we also single stepped at this location
// then we skip the duplicate breakpoint.
_breakpoint_posted = _breakpoint_posted && _single_stepping_posted;
break;
case JVMTI_EVENT_SINGLE_STEP:
// Repeat single step is easy: just don't post it again.
// If step is pending for popframe then it may not be
// a repeat step. The new_bci and method_id is same as current_bci
// and current method_id after pop and step for recursive calls.
// This has been handled by clearing the location
_single_stepping_posted = true;
break;
default:
assert(false, "invalid event value passed");
break;
}
return;
}
set_current_location(new_method_id, new_bci);
_breakpoint_posted = false;
_single_stepping_posted = false;
}
int CppInterpreter::accessor_entry(methodOop method, intptr_t UNUSED, TRAPS) {
JavaThread *thread = (JavaThread *) THREAD;
ZeroStack *stack = thread->zero_stack();
intptr_t *locals = stack->sp();
// Drop into the slow path if we need a safepoint check
if (SafepointSynchronize::do_call_back()) {
return normal_entry(method, 0, THREAD);
}
// Load the object pointer and drop into the slow path
// if we have a NullPointerException
oop object = LOCALS_OBJECT(0);
if (object == NULL) {
return normal_entry(method, 0, THREAD);
}
// Read the field index from the bytecode, which looks like this:
// 0: aload_0
// 1: getfield
// 2: index
// 3: index
// 4: ireturn/areturn
// NB this is not raw bytecode: index is in machine order
u1 *code = method->code_base();
assert(code[0] == Bytecodes::_aload_0 &&
code[1] == Bytecodes::_getfield &&
(code[4] == Bytecodes::_ireturn ||
code[4] == Bytecodes::_areturn), "should do");
u2 index = Bytes::get_native_u2(&code[2]);
// Get the entry from the constant pool cache, and drop into
// the slow path if it has not been resolved
constantPoolCacheOop cache = method->constants()->cache();
ConstantPoolCacheEntry* entry = cache->entry_at(index);
if (!entry->is_resolved(Bytecodes::_getfield)) {
return normal_entry(method, 0, THREAD);
}
// Get the result and push it onto the stack
switch (entry->flag_state()) {
case ltos:
case dtos:
stack->overflow_check(1, CHECK_0);
stack->alloc(wordSize);
break;
}
if (entry->is_volatile()) {
switch (entry->flag_state()) {
case ctos:
SET_LOCALS_INT(object->char_field_acquire(entry->f2()), 0);
break;
case btos:
SET_LOCALS_INT(object->byte_field_acquire(entry->f2()), 0);
break;
case stos:
SET_LOCALS_INT(object->short_field_acquire(entry->f2()), 0);
break;
case itos:
SET_LOCALS_INT(object->int_field_acquire(entry->f2()), 0);
break;
case ltos:
SET_LOCALS_LONG(object->long_field_acquire(entry->f2()), 0);
break;
case ftos:
SET_LOCALS_FLOAT(object->float_field_acquire(entry->f2()), 0);
break;
case dtos:
SET_LOCALS_DOUBLE(object->double_field_acquire(entry->f2()), 0);
break;
case atos:
SET_LOCALS_OBJECT(object->obj_field_acquire(entry->f2()), 0);
break;
default:
ShouldNotReachHere();
}
}
else {
switch (entry->flag_state()) {
case ctos:
SET_LOCALS_INT(object->char_field(entry->f2()), 0);
break;
case btos:
SET_LOCALS_INT(object->byte_field(entry->f2()), 0);
break;
case stos:
SET_LOCALS_INT(object->short_field(entry->f2()), 0);
break;
case itos:
SET_LOCALS_INT(object->int_field(entry->f2()), 0);
break;
case ltos:
SET_LOCALS_LONG(object->long_field(entry->f2()), 0);
break;
case ftos:
SET_LOCALS_FLOAT(object->float_field(entry->f2()), 0);
break;
case dtos:
SET_LOCALS_DOUBLE(object->double_field(entry->f2()), 0);
break;
case atos:
SET_LOCALS_OBJECT(object->obj_field(entry->f2()), 0);
break;
default:
ShouldNotReachHere();
}
}
// No deoptimized frames on the stack
return 0;
}
// Rewrites a method given the index_map information
void Rewriter::scan_method(methodOop method, bool reverse) {
int nof_jsrs = 0;
bool has_monitor_bytecodes = false;
{
// We cannot tolerate a GC in this block, because we've
// cached the bytecodes in 'code_base'. If the methodOop
// moves, the bytecodes will also move.
No_Safepoint_Verifier nsv;
Bytecodes::Code c;
// Bytecodes and their length
const address code_base = method->code_base();
const int code_length = method->code_size();
int bc_length;
for (int bci = 0; bci < code_length; bci += bc_length) {
address bcp = code_base + bci;
int prefix_length = 0;
c = (Bytecodes::Code)(*bcp);
// Since we have the code, see if we can get the length
// directly. Some more complicated bytecodes will report
// a length of zero, meaning we need to make another method
// call to calculate the length.
bc_length = Bytecodes::length_for(c);
if (bc_length == 0) {
bc_length = Bytecodes::length_at(method, bcp);
// length_at will put us at the bytecode after the one modified
// by 'wide'. We don't currently examine any of the bytecodes
// modified by wide, but in case we do in the future...
if (c == Bytecodes::_wide) {
prefix_length = 1;
c = (Bytecodes::Code)bcp[1];
}
}
assert(bc_length != 0, "impossible bytecode length");
switch (c) {
case Bytecodes::_lookupswitch : {
#ifndef CC_INTERP
Bytecode_lookupswitch bc(method, bcp);
(*bcp) = (
bc.number_of_pairs() < BinarySwitchThreshold
? Bytecodes::_fast_linearswitch
: Bytecodes::_fast_binaryswitch
);
#endif
break;
}
case Bytecodes::_fast_linearswitch:
case Bytecodes::_fast_binaryswitch: {
#ifndef CC_INTERP
(*bcp) = Bytecodes::_lookupswitch;
#endif
break;
}
case Bytecodes::_getstatic : // fall through
case Bytecodes::_putstatic : // fall through
case Bytecodes::_getfield : // fall through
case Bytecodes::_putfield : // fall through
case Bytecodes::_invokevirtual : // fall through
case Bytecodes::_invokespecial : // fall through
case Bytecodes::_invokestatic :
case Bytecodes::_invokeinterface:
rewrite_member_reference(bcp, prefix_length+1, reverse);
break;
case Bytecodes::_invokedynamic:
rewrite_invokedynamic(bcp, prefix_length+1, reverse);
break;
case Bytecodes::_ldc:
case Bytecodes::_fast_aldc:
maybe_rewrite_ldc(bcp, prefix_length+1, false, reverse);
break;
case Bytecodes::_ldc_w:
case Bytecodes::_fast_aldc_w:
maybe_rewrite_ldc(bcp, prefix_length+1, true, reverse);
break;
case Bytecodes::_jsr : // fall through
case Bytecodes::_jsr_w : nof_jsrs++; break;
case Bytecodes::_monitorenter : // fall through
case Bytecodes::_monitorexit : has_monitor_bytecodes = true; break;
}
}
}
// Update access flags
if (has_monitor_bytecodes) {
method->set_has_monitor_bytecodes();
}
// The present of a jsr bytecode implies that the method might potentially
// have to be rewritten, so we run the oopMapGenerator on the method
if (nof_jsrs > 0) {
method->set_has_jsrs();
// Second pass will revisit this method.
assert(method->has_jsrs(), "didn't we just set this?");
}
}