//------------------------------do_instanceof----------------------------------
void Parse::do_instanceof() {
if (stopped()) return;
// We would like to return false if class is not loaded, emitting a
// dependency, but Java requires instanceof to load its operand.
// Throw uncommon trap if class is not loaded
bool will_link;
ciKlass* klass = iter().get_klass(will_link);
if (!will_link) {
if (C->log() != NULL) {
C->log()->elem("assert_null reason='instanceof' klass='%d'",
C->log()->identify(klass));
}
do_null_assert(peek(), T_OBJECT);
assert( stopped() || _gvn.type(peek())->higher_equal(TypePtr::NULL_PTR), "what's left behind is null" );
if (!stopped()) {
// The object is now known to be null.
// Shortcut the effect of gen_instanceof and return "false" directly.
pop(); // pop the null
push(_gvn.intcon(0)); // push false answer
}
return;
}
// Push the bool result back on stack
push( gen_instanceof( pop(), makecon(TypeKlassPtr::make(klass)) ) );
}
//=============================================================================
//------------------------------do_checkcast-----------------------------------
void Parse::do_checkcast() {
bool will_link;
ciKlass* klass = iter().get_klass(will_link);
Node *obj = peek();
// Throw uncommon trap if class is not loaded or the value we are casting
// _from_ is not loaded, and value is not null. If the value _is_ NULL,
// then the checkcast does nothing.
const TypeInstPtr *tp = _gvn.type(obj)->isa_instptr();
if (!will_link || (tp && !tp->is_loaded())) {
if (C->log() != NULL) {
if (!will_link) {
C->log()->elem("assert_null reason='checkcast' klass='%d'",
C->log()->identify(klass));
}
if (tp && !tp->is_loaded()) {
// %%% Cannot happen?
C->log()->elem("assert_null reason='checkcast source' klass='%d'",
C->log()->identify(tp->klass()));
}
}
do_null_assert(obj, T_OBJECT);
assert( stopped() || _gvn.type(peek())->higher_equal(TypePtr::NULL_PTR), "what's left behind is null" );
if (!stopped()) {
profile_null_checkcast();
}
return;
}
Node *res = gen_checkcast(obj, makecon(TypeKlassPtr::make(klass)) );
// Pop from stack AFTER gen_checkcast because it can uncommon trap and
// the debug info has to be correct.
pop();
push(res);
}
void Parse::do_get_xxx(Node* obj, ciField* field, bool is_field) {
// Does this field have a constant value? If so, just push the value.
if (field->is_constant()) {
if (field->is_static()) {
// final static field
if (push_constant(field->constant_value()))
return;
}
else {
// final non-static field of a trusted class (classes in
// java.lang.invoke and sun.invoke packages and subpackages).
if (obj->is_Con()) {
const TypeOopPtr* oop_ptr = obj->bottom_type()->isa_oopptr();
ciObject* constant_oop = oop_ptr->const_oop();
ciConstant constant = field->constant_value_of(constant_oop);
if (push_constant(constant, true))
return;
}
}
}
ciType* field_klass = field->type();
bool is_vol = field->is_volatile();
// Compute address and memory type.
int offset = field->offset_in_bytes();
const TypePtr* adr_type = C->alias_type(field)->adr_type();
Node *adr = basic_plus_adr(obj, obj, offset);
BasicType bt = field->layout_type();
// Build the resultant type of the load
const Type *type;
bool must_assert_null = false;
if( bt == T_OBJECT ) {
if (!field->type()->is_loaded()) {
type = TypeInstPtr::BOTTOM;
must_assert_null = true;
} else if (field->is_constant() && field->is_static()) {
// This can happen if the constant oop is non-perm.
ciObject* con = field->constant_value().as_object();
// Do not "join" in the previous type; it doesn't add value,
// and may yield a vacuous result if the field is of interface type.
type = TypeOopPtr::make_from_constant(con)->isa_oopptr();
assert(type != NULL, "field singleton type must be consistent");
} else {
type = TypeOopPtr::make_from_klass(field_klass->as_klass());
}
} else {
type = Type::get_const_basic_type(bt);
}
// Build the load.
Node* ld = make_load(NULL, adr, type, bt, adr_type, is_vol);
// Adjust Java stack
if (type2size[bt] == 1)
push(ld);
else
push_pair(ld);
if (must_assert_null) {
// Do not take a trap here. It's possible that the program
// will never load the field's class, and will happily see
// null values in this field forever. Don't stumble into a
// trap for such a program, or we might get a long series
// of useless recompilations. (Or, we might load a class
// which should not be loaded.) If we ever see a non-null
// value, we will then trap and recompile. (The trap will
// not need to mention the class index, since the class will
// already have been loaded if we ever see a non-null value.)
// uncommon_trap(iter().get_field_signature_index());
#ifndef PRODUCT
if (PrintOpto && (Verbose || WizardMode)) {
method()->print_name(); tty->print_cr(" asserting nullness of field at bci: %d", bci());
}
#endif
if (C->log() != NULL) {
C->log()->elem("assert_null reason='field' klass='%d'",
C->log()->identify(field->type()));
}
// If there is going to be a trap, put it at the next bytecode:
set_bci(iter().next_bci());
do_null_assert(peek(), T_OBJECT);
set_bci(iter().cur_bci()); // put it back
}
// If reference is volatile, prevent following memory ops from
// floating up past the volatile read. Also prevents commoning
// another volatile read.
if (field->is_volatile()) {
// Memory barrier includes bogus read of value to force load BEFORE membar
insert_mem_bar(Op_MemBarAcquire, ld);
}
}
//------------------------------do_call----------------------------------------
// Handle your basic call. Inline if we can & want to, else just setup call.
void Parse::do_call() {
// It's likely we are going to add debug info soon.
// Also, if we inline a guy who eventually needs debug info for this JVMS,
// our contribution to it is cleaned up right here.
kill_dead_locals();
// Set frequently used booleans
bool is_virtual = bc() == Bytecodes::_invokevirtual;
bool is_virtual_or_interface = is_virtual || bc() == Bytecodes::_invokeinterface;
bool has_receiver = is_virtual_or_interface || bc() == Bytecodes::_invokespecial;
// Find target being called
bool will_link;
ciMethod* dest_method = iter().get_method(will_link);
ciInstanceKlass* holder_klass = dest_method->holder();
ciKlass* holder = iter().get_declared_method_holder();
ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
int nargs = dest_method->arg_size();
// See if the receiver (if any) is NULL, hence we always throw BEFORE
// attempting to resolve the call or initialize the holder class. Doing so
// out of order opens a window where we can endlessly deopt because the call
// holder is not initialized, but the call never actually happens (forcing
// class initialization) because we only see NULL receivers.
CPData_Invoke *caller_cpdi = cpdata()->as_Invoke(bc());
debug_only( assert(caller_cpdi->is_Invoke(), "Not invoke!") );
if( is_virtual_or_interface &&
_gvn.type(stack(sp() - nargs))->higher_equal(TypePtr::NULL_PTR) ) {
builtin_throw( Deoptimization::Reason_null_check, "null receiver", caller_cpdi, caller_cpdi->saw_null(), /*must_throw=*/true );
return;
}
// uncommon-trap when callee is unloaded, uninitialized or will not link
// bailout when too many arguments for register representation
if (!will_link || can_not_compile_call_site(dest_method, klass)) {
return;
}
assert(FAM||holder_klass->is_loaded(),"");
assert(dest_method->is_static() == !has_receiver, "must match bc");
// Note: this takes into account invokeinterface of methods declared in java/lang/Object,
// which should be invokevirtuals but according to the VM spec may be invokeinterfaces
assert(holder_klass->is_interface() || holder_klass->super() == NULL || (bc() != Bytecodes::_invokeinterface), "must match bc");
// Note: In the absence of miranda methods, an abstract class K can perform
// an invokevirtual directly on an interface method I.m if K implements I.
// ---------------------
// Does Class Hierarchy Analysis reveal only a single target of a v-call?
// Then we may inline or make a static call, but become dependent on there being only 1 target.
// Does the call-site type profile reveal only one receiver?
// Then we may introduce a run-time check and inline on the path where it succeeds.
// The other path may uncommon_trap, check for another receiver, or do a v-call.
// Choose call strategy.
bool call_is_virtual = is_virtual_or_interface;
int vtable_index = methodOopDesc::invalid_vtable_index;
ciMethod* call_method = dest_method;
// Try to get the most accurate receiver type
if (is_virtual_or_interface) {
Node* receiver_node = stack(sp() - nargs);
const TypeInstPtr*inst_type=_gvn.type(receiver_node)->isa_instptr();
if( inst_type ) {
ciInstanceKlass*ikl=inst_type->klass()->as_instance_klass();
// If the receiver is not yet linked then: (1) we never can make this
// call because no objects can be created until linkage, and (2) CHA
// reports incorrect answers... so do not bother with making the call
// until after the klass gets linked.
ciInstanceKlass *ikl2 = ikl->is_subtype_of(klass) ? ikl : klass;
if(!ikl->is_linked()){
uncommon_trap(Deoptimization::Reason_uninitialized,klass,"call site where receiver is not linked",false);
return;
}
}
const TypeOopPtr* receiver_type = _gvn.type(receiver_node)->isa_oopptr();
ciMethod* optimized_virtual_method = optimize_inlining(method(), bci(), klass, dest_method, receiver_type);
// Have the call been sufficiently improved such that it is no longer a virtual?
if (optimized_virtual_method != NULL) {
call_method = optimized_virtual_method;
call_is_virtual = false;
} else if (false) {
// We can make a vtable call at this site
vtable_index = call_method->resolve_vtable_index(method()->holder(), klass);
}
}
// Note: It's OK to try to inline a virtual call.
// The call generator will not attempt to inline a polymorphic call
// unless it knows how to optimize the receiver dispatch.
bool try_inline=(C->do_inlining()||InlineAccessors)&&
(!C->method()->should_disable_inlining()) &&
(call_method->number_of_breakpoints() == 0);
// Get profile data for the *callee*. First see if we have precise
// CodeProfile for this exact inline because C1 inlined it already.
CodeProfile *callee_cp;
int callee_cp_inloff;
if( caller_cpdi->inlined_method_oid() == call_method->objectId() ) {
callee_cp = c1_cp(); // Use same CodeProfile as current
callee_cp_inloff = caller_cpdi->cpd_offset(); // But use inlined portion
} else {
// If callee has a cp, clone it and use
callee_cp = call_method->codeprofile(true);
callee_cp_inloff = 0;
if (callee_cp || FAM) {
// The cloned cp needs to be freed later
Compile* C = Compile::current();
C->record_cloned_cp(callee_cp);
} else { // Had profile info at top level, but not for this call site?
// callee_cp will hold the just created cp, or whatever cp allocated by
// other thread which wins the race in set_codeprofile
callee_cp = call_method->set_codeprofile(CodeProfile::make(call_method));
}
}
CPData_Invoke *c2_caller_cpdi = UseC1 ? c2cpdata()->as_Invoke(bc()) : NULL;
// ---------------------
inc_sp(- nargs); // Temporarily pop args for JVM state of call
JVMState* jvms = sync_jvms();
// ---------------------
// Decide call tactic.
// This call checks with CHA, the interpreter profile, intrinsics table, etc.
// It decides whether inlining is desirable or not.
CallGenerator*cg=C->call_generator(call_method,vtable_index,call_is_virtual,jvms,try_inline,prof_factor(),callee_cp,callee_cp_inloff,c2_caller_cpdi,caller_cpdi);
// ---------------------
// Round double arguments before call
round_double_arguments(dest_method);
#ifndef PRODUCT
// Record first part of parsing work for this call
parse_histogram()->record_change();
#endif // not PRODUCT
assert(jvms == this->jvms(), "still operating on the right JVMS");
assert(jvms_in_sync(), "jvms must carry full info into CG");
// save across call, for a subsequent cast_not_null.
Node* receiver = has_receiver ? argument(0) : NULL;
JVMState* new_jvms = cg->generate(jvms, caller_cpdi, is_private_copy());
if( new_jvms == NULL ) { // Did it work?
// When inlining attempt fails (e.g., too many arguments),
// it may contaminate the current compile state, making it
// impossible to pull back and try again. Once we call
// cg->generate(), we are committed. If it fails, the whole
// compilation task is compromised.
if (failing()) return;
if (PrintOpto || PrintInlining || PrintC2Inlining) {
// Only one fall-back, so if an intrinsic fails, ignore any bytecodes.
if (cg->is_intrinsic() && call_method->code_size() > 0) {
C2OUT->print("Bailed out of intrinsic, will not inline: ");
call_method->print_name(C2OUT); C2OUT->cr();
}
}
// This can happen if a library intrinsic is available, but refuses
// the call site, perhaps because it did not match a pattern the
// intrinsic was expecting to optimize. The fallback position is
// to call out-of-line.
try_inline = false; // Inline tactic bailed out.
cg=C->call_generator(call_method,vtable_index,call_is_virtual,jvms,try_inline,prof_factor(),c1_cp(),c1_cp_inloff(),c2_caller_cpdi,caller_cpdi);
new_jvms=cg->generate(jvms,caller_cpdi,is_private_copy());
assert(new_jvms!=NULL,"call failed to generate: calls should work");
if (c2_caller_cpdi) c2_caller_cpdi->_inlining_failure_id = IF_GENERALFAILURE;
}
if (cg->is_inline()) {
C->env()->notice_inlined_method(call_method);
}
// Reset parser state from [new_]jvms, which now carries results of the call.
// Return value (if any) is already pushed on the stack by the cg.
add_exception_states_from(new_jvms);
if (new_jvms->map()->control() == top()) {
stop_and_kill_map();
} else {
assert(new_jvms->same_calls_as(jvms), "method/bci left unchanged");
set_jvms(new_jvms);
}
if (!stopped()) {
// This was some sort of virtual call, which did a null check for us.
// Now we can assert receiver-not-null, on the normal return path.
if (receiver != NULL && cg->is_virtual()) {
Node*cast=cast_not_null(receiver,true);
// %%% assert(receiver == cast, "should already have cast the receiver");
}
// Round double result after a call from strict to non-strict code
round_double_result(dest_method);
// If the return type of the method is not loaded, assert that the
// value we got is a null. Otherwise, we need to recompile.
if (!dest_method->return_type()->is_loaded()) {
// If there is going to be a trap, put it at the next bytecode:
set_bci(iter().next_bci());
do_null_assert(peek(), T_OBJECT);
set_bci(iter().cur_bci()); // put it back
} else {
assert0( call_method->return_type()->is_loaded() );
BasicType result_type = dest_method->return_type()->basic_type();
if(result_type==T_OBJECT||result_type==T_ARRAY){
const Type *t = peek()->bottom_type();
assert0( t == TypePtr::NULL_PTR || t->is_oopptr()->klass()->is_loaded() );
}
}
}
// Restart record of parsing work after possible inlining of call
#ifndef PRODUCT
parse_histogram()->set_initial_state(bc());
#endif
}
