oop* InterpretedIC::inline_cache_miss() {
NoGCVerifier noGC;
// get ic info
frame f = DeltaProcess::active()->last_frame();
InterpretedIC* ic = f.current_interpretedIC();
Bytecodes::Code send_code = ic->send_code();
oop receiver = ic->argument_spec() == Bytecodes::args_only // Are we at a self or super send?
? f.receiver() // yes: take receiver of frame
: f.expr(ic->nof_arguments()); // no: take receiver pushed before the arguments
// do the lookup
klassOop klass = receiver->klass();
LookupResult result = Bytecodes::is_super_send(send_code)
? interpreter_super_lookup(ic->selector())
: interpreter_normal_lookup(klass, ic->selector());
// tracing
if (TraceInlineCacheMiss) {
std->print("IC miss, "); trace_inline_cache_miss(ic, klass, result);
}
// handle the lookup result
if (!result.is_empty()) {
update_inline_cache(ic, &f, ic->send_code(), klass, result);
return NULL;
} else {
return cacheMissResult(does_not_understand(receiver, ic, &f),
ic->nof_arguments() + (ic->argument_spec() == Bytecodes::args_only ? 0 : 1))->objs(1);
}
}
void InterpretedIC::inline_cache_miss() {
NoGCVerifier noGC;
// get ic info
frame f = DeltaProcess::active()->last_frame();
InterpretedIC* ic = f.current_interpretedIC();
Bytecodes::Code send_code = ic->send_code();
oop receiver = ic->argument_spec() == Bytecodes::args_only // Are we at a self or super send?
? f.receiver() // yes: take receiver of frame
: f.expr(ic->nof_arguments()); // no: take receiver pushed before the arguments
// do the lookup
klassOop klass = receiver->klass();
LookupResult result = Bytecodes::is_super_send(send_code)
? interpreter_super_lookup(ic->selector())
: interpreter_normal_lookup(klass, ic->selector());
// tracing
if (TraceMessageSend) std->print_cr("inline cache miss");
if (TraceLookup) trace_inline_cache_miss(ic, klass, result);
// handle the lookup result
if (!result.is_empty())
update_inline_cache(ic, &f, send_code, klass, result);
else {
does_not_understand(receiver, ic, &f);
// If the program continues we'll redo the inline_cache_miss
if (!have_nlr_through_C) inline_cache_miss();
}
}
LookupResult lookup(klassOop klass, symbolOop selector) {
if (!match(klass, selector)) {
_result = interpreter_normal_lookup(klass, selector);
if (!_result.is_empty()) {
_key.initialize(klass, selector);
}
}
return _result;
}
void InterpretedIC::replace(LookupResult result, klassOop receiver_klass) {
// IC entries before modification - used for loging only
Bytecodes::Code code_before = send_code();
oop word1_before = first_word();
oop word2_before = second_word();
int transition = 0;
// modify IC
guarantee(word2_before == receiver_klass, "klass should be the same");
if (result.is_empty()) {
clear();
transition = 1;
} else if (result.is_method()) {
if (send_type() == Bytecodes::megamorphic_send) {
set(send_code(), result.method(), receiver_klass);
transition = 2;
} else {
// Please Fix this Robert
// implement set_monomorphic(klass, method)
clear();
transition = 3;
}
} else {
if (send_type() == Bytecodes::megamorphic_send) {
set(send_code(), oop(result.entry()), receiver_klass);
transition = 4;
} else {
assert(result.is_entry(), "must be jump table entry");
// a jump table entry of a nmethod is found so let's update the current send
set(Bytecodes::compiled_send_code_for(send_code()), oop(result.entry()), receiver_klass);
transition = 5;
}
}
// IC entries after modification - used for loging only
Bytecodes::Code code_after = send_code();
oop word1_after = first_word();
oop word2_after = second_word();
// log modification
LOG_EVENT3("InterpretedIC::replace: IC at 0x%x: entry for klass 0x%x replaced (transition %d)", this, receiver_klass, transition);
LOG_EVENT3(" from (%s, 0x%x, 0x%x)", Bytecodes::name(code_before), word1_before, word2_before);
LOG_EVENT3(" to (%s, 0x%x, 0x%x)", Bytecodes::name(code_after ), word1_after , word2_after );
}
