bool ConstantPoolCacheEntry::is_interesting_method_entry(klassOop k) {
if (!is_method_entry()) {
// not a method entry so not interesting by default
return false;
}
methodOop m = NULL;
if (is_vfinal()) {
// virtual and final so _f2 contains method ptr instead of vtable index
m = f2_as_vfinal_method();
} else if (is_f1_null()) {
// NULL _f1 means this is a virtual entry so also not interesting
return false;
} else {
oop f1 = _f1; // _f1 is volatile
if (!f1->is_method()) {
// _f1 can also contain a klassOop for an interface
return false;
}
m = f1_as_method();
}
assert(m != NULL && m->is_method(), "sanity check");
if (m == NULL || !m->is_method() || m->method_holder() != k) {
// robustness for above sanity checks or method is not in
// the interesting class
return false;
}
// the method is in the interesting class so the entry is interesting
return true;
}
void ConstantPoolCacheEntry::adjust_pointers() {
assert(in_words(size()) == 4, "check code below - may need adjustment");
// field[1] is always oop or NULL
MarkSweep::adjust_pointer((oop*)&_f1);
if (is_vfinal()) {
MarkSweep::adjust_pointer((oop*)&_f2);
}
}
void ConstantPoolCacheEntry::oop_iterate_m(OopClosure* blk, MemRegion mr) {
assert(in_words(size()) == 4, "check code below - may need adjustment");
// field[1] is always oop or NULL
if (mr.contains((oop *)&_f1)) blk->do_oop((oop*)&_f1);
if (is_vfinal()) {
if (mr.contains((oop *)&_f2)) blk->do_oop((oop*)&_f2);
}
}
void ConstantPoolCacheEntry::oop_iterate(OopClosure* blk) {
assert(in_words(size()) == 4, "check code below - may need adjustment");
// field[1] is always oop or NULL
blk->do_oop((oop*)&_f1);
if (is_vfinal()) {
blk->do_oop((oop*)&_f2);
}
}
void ConstantPoolCacheEntry::update_pointers() {
assert(in_words(size()) == 4, "check code below - may need adjustment");
// field[1] is always oop or NULL
PSParallelCompact::adjust_pointer((oop*)&_f1);
if (is_vfinal()) {
PSParallelCompact::adjust_pointer((oop*)&_f2);
}
}
void ConstantPoolCacheEntry::follow_contents(ParCompactionManager* cm) {
assert(in_words(size()) == 4, "check code below - may need adjustment");
// field[1] is always oop or NULL
PSParallelCompact::mark_and_push(cm, (oop*)&_f1);
if (is_vfinal()) {
PSParallelCompact::mark_and_push(cm, (oop*)&_f2);
}
}
// RedefineClasses() API support:
// If this ConstantPoolCacheEntry refers to old_method then update it
// to refer to new_method.
bool ConstantPoolCacheEntry::adjust_method_entry(Method* old_method,
Method* new_method, bool * trace_name_printed) {
if (is_vfinal()) {
// virtual and final so _f2 contains method ptr instead of vtable index
if (f2_as_vfinal_method() == old_method) {
// match old_method so need an update
// NOTE: can't use set_f2_as_vfinal_method as it asserts on different values
_f2 = (intptr_t)new_method;
if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
if (!(*trace_name_printed)) {
// RC_TRACE_MESG macro has an embedded ResourceMark
RC_TRACE_MESG(("adjust: name=%s",
old_method->method_holder()->external_name()));
*trace_name_printed = true;
}
// RC_TRACE macro has an embedded ResourceMark
RC_TRACE(0x00400000, ("cpc vf-entry update: %s(%s)",
new_method->name()->as_C_string(),
new_method->signature()->as_C_string()));
}
return true;
}
// f1() is not used with virtual entries so bail out
return false;
}
if (_f1 == NULL) {
// NULL f1() means this is a virtual entry so bail out
// We are assuming that the vtable index does not need change.
return false;
}
if (_f1 == old_method) {
_f1 = new_method;
if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
if (!(*trace_name_printed)) {
// RC_TRACE_MESG macro has an embedded ResourceMark
RC_TRACE_MESG(("adjust: name=%s",
old_method->method_holder()->external_name()));
*trace_name_printed = true;
}
// RC_TRACE macro has an embedded ResourceMark
RC_TRACE(0x00400000, ("cpc entry update: %s(%s)",
new_method->name()->as_C_string(),
new_method->signature()->as_C_string()));
}
return true;
}
return false;
}
methodOop ConstantPoolCacheEntry::method_if_resolved(constantPoolHandle cpool) {
if (is_secondary_entry()) {
if (!is_f1_null())
return f2_as_vfinal_method();
return NULL;
}
// Decode the action of set_method and set_interface_call
Bytecodes::Code invoke_code = bytecode_1();
if (invoke_code != (Bytecodes::Code)0) {
oop f1 = _f1;
if (f1 != NULL) {
switch (invoke_code) {
case Bytecodes::_invokeinterface:
assert(f1->is_klass(), "");
return klassItable::method_for_itable_index(klassOop(f1), f2_as_index());
case Bytecodes::_invokestatic:
case Bytecodes::_invokespecial:
assert(!has_appendix(), "");
assert(f1->is_method(), "");
return methodOop(f1);
}
}
}
invoke_code = bytecode_2();
if (invoke_code != (Bytecodes::Code)0) {
switch (invoke_code) {
case Bytecodes::_invokevirtual:
if (is_vfinal()) {
// invokevirtual
methodOop m = f2_as_vfinal_method();
assert(m->is_method(), "");
return m;
} else {
int holder_index = cpool->uncached_klass_ref_index_at(constant_pool_index());
if (cpool->tag_at(holder_index).is_klass()) {
klassOop klass = cpool->resolved_klass_at(holder_index);
if (!Klass::cast(klass)->oop_is_instance())
klass = SystemDictionary::Object_klass();
return instanceKlass::cast(klass)->method_at_vtable(f2_as_index());
}
}
break;
case Bytecodes::_invokehandle:
case Bytecodes::_invokedynamic:
return f2_as_vfinal_method();
}
}
return NULL;
}
void ConstantPoolCacheEntry::adjust_method_entry(methodOop old_method, methodOop new_method) {
// virtual, final
if (is_vfinal()) {
if (f2() == (intptr_t)old_method) {
_f2 = (intptr_t)new_method;
}
return;
}
if (_f1 == NULL) // Virtual call. So far we assume the vtable indices don't change
return;
if (_f1 == old_method) {
_f1 = new_method;
}
}
// a constant pool cache entry should never contain old or obsolete methods
bool ConstantPoolCacheEntry::check_no_old_or_obsolete_entries() {
if (is_vfinal()) {
// virtual and final so _f2 contains method ptr instead of vtable index
methodOop m = (methodOop)_f2;
// Return false if _f2 refers to an old or an obsolete method.
// _f2 == NULL || !m->is_method() are just as unexpected here.
return (m != NULL && m->is_method() && !m->is_old() && !m->is_obsolete());
} else if ((oop)_f1 == NULL || !((oop)_f1)->is_method()) {
// _f1 == NULL || !_f1->is_method() are OK here
return true;
}
methodOop m = (methodOop)_f1;
// return false if _f1 refers to an old or an obsolete method
return (!m->is_old() && !m->is_obsolete());
}
Method* ConstantPoolCacheEntry::method_if_resolved(constantPoolHandle cpool) {
// Decode the action of set_method and set_interface_call
Bytecodes::Code invoke_code = bytecode_1();
if (invoke_code != (Bytecodes::Code)0) {
Metadata* f1 = f1_ord();
if (f1 != NULL) {
switch (invoke_code) {
case Bytecodes::_invokeinterface:
assert(f1->is_klass(), "");
return klassItable::method_for_itable_index((Klass*)f1, f2_as_index());
case Bytecodes::_invokestatic:
case Bytecodes::_invokespecial:
assert(!has_appendix(), "");
case Bytecodes::_invokehandle:
case Bytecodes::_invokedynamic:
assert(f1->is_method(), "");
return (Method*)f1;
}
}
}
invoke_code = bytecode_2();
if (invoke_code != (Bytecodes::Code)0) {
switch (invoke_code) {
case Bytecodes::_invokevirtual:
if (is_vfinal()) {
// invokevirtual
Method* m = f2_as_vfinal_method();
assert(m->is_method(), "");
return m;
} else {
int holder_index = cpool->uncached_klass_ref_index_at(constant_pool_index());
if (cpool->tag_at(holder_index).is_klass()) {
Klass* klass = cpool->resolved_klass_at(holder_index);
if (!klass->oop_is_instance())
klass = SystemDictionary::Object_klass();
return InstanceKlass::cast(klass)->method_at_vtable(f2_as_index());
}
}
break;
}
}
return NULL;
}
void ConstantPoolCacheEntry::set_method(Bytecodes::Code invoke_code,
methodHandle method,
int vtable_index) {
assert(method->interpreter_entry() != NULL, "should have been set at this point");
assert(!method->is_old_version(), "attempt to write old method to cpCache");
bool change_to_virtual = (invoke_code == Bytecodes::_invokeinterface);
int byte_no = -1;
bool needs_vfinal_flag = false;
switch (invoke_code) {
case Bytecodes::_invokevirtual:
case Bytecodes::_invokeinterface: {
if (Klass::can_be_statically_bound(method())) {
set_f2((intptr_t)method());
needs_vfinal_flag = true;
} else {
set_f2(vtable_index);
}
byte_no = 2;
break;
}
case Bytecodes::_invokespecial:
// Preserve the value of the vfinal flag on invokevirtual bytecode
// which may be shared with this constant pool cache entry.
needs_vfinal_flag = is_resolved(Bytecodes::_invokevirtual) && is_vfinal();
// fall through
case Bytecodes::_invokestatic:
set_f1(method());
byte_no = 1;
break;
default:
ShouldNotReachHere();
break;
}
set_flags(as_flags(as_TosState(method->result_type()),
method->is_final_method(),
needs_vfinal_flag,
false,
change_to_virtual,
true)|
method()->size_of_parameters());
// Note: byte_no also appears in TemplateTable::resolve.
if (byte_no == 1) {
set_bytecode_1(invoke_code);
} else if (byte_no == 2) {
if (change_to_virtual) {
// NOTE: THIS IS A HACK - BE VERY CAREFUL!!!
//
// Workaround for the case where we encounter an invokeinterface, but we
// should really have an _invokevirtual since the resolved method is a
// virtual method in java.lang.Object. This is a corner case in the spec
// but is presumably legal. javac does not generate this code.
//
// We set bytecode_1() to _invokeinterface, because that is the
// bytecode # used by the interpreter to see if it is resolved.
// We set bytecode_2() to _invokevirtual.
// See also interpreterRuntime.cpp. (8/25/2000)
set_bytecode_1(invoke_code);
set_bytecode_2(Bytecodes::_invokevirtual);
} else {
set_bytecode_2(invoke_code);
}
} else {
ShouldNotReachHere();
}
verify(tty);
}
void set_f2_as_vfinal_method(methodOop f2) {
assert(_f2 == 0 || _f2 == (intptr_t) f2, "illegal field change");
assert(is_vfinal(), "flags must be set");
_f2 = (intptr_t) f2;
}
void set_f2_as_vfinal_method(Method* f2) {
assert(is_vfinal(), "flags must be set");
set_f2((intx)f2);
}
void ConstantPoolCacheEntry::set_direct_or_vtable_call(Bytecodes::Code invoke_code,
methodHandle method,
int vtable_index) {
bool is_vtable_call = (vtable_index >= 0); // FIXME: split this method on this boolean
assert(method->interpreter_entry() != NULL, "should have been set at this point");
assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache");
int byte_no = -1;
bool change_to_virtual = false;
switch (invoke_code) {
case Bytecodes::_invokeinterface:
// We get here from InterpreterRuntime::resolve_invoke when an invokeinterface
// instruction somehow links to a non-interface method (in Object).
// In that case, the method has no itable index and must be invoked as a virtual.
// Set a flag to keep track of this corner case.
change_to_virtual = true;
// ...and fall through as if we were handling invokevirtual:
case Bytecodes::_invokevirtual:
{
if (!is_vtable_call) {
assert(method->can_be_statically_bound(), "");
// set_f2_as_vfinal_method checks if is_vfinal flag is true.
set_method_flags(as_TosState(method->result_type()),
( 1 << is_vfinal_shift) |
((method->is_final_method() ? 1 : 0) << is_final_shift) |
((change_to_virtual ? 1 : 0) << is_forced_virtual_shift),
method()->size_of_parameters());
set_f2_as_vfinal_method(method());
} else {
assert(!method->can_be_statically_bound(), "");
assert(vtable_index >= 0, "valid index");
assert(!method->is_final_method(), "sanity");
set_method_flags(as_TosState(method->result_type()),
((change_to_virtual ? 1 : 0) << is_forced_virtual_shift),
method()->size_of_parameters());
set_f2(vtable_index);
}
byte_no = 2;
break;
}
case Bytecodes::_invokespecial:
case Bytecodes::_invokestatic:
assert(!is_vtable_call, "");
// Note: Read and preserve the value of the is_vfinal flag on any
// invokevirtual bytecode shared with this constant pool cache entry.
// It is cheap and safe to consult is_vfinal() at all times.
// Once is_vfinal is set, it must stay that way, lest we get a dangling oop.
set_method_flags(as_TosState(method->result_type()),
((is_vfinal() ? 1 : 0) << is_vfinal_shift) |
((method->is_final_method() ? 1 : 0) << is_final_shift),
method()->size_of_parameters());
set_f1(method());
byte_no = 1;
break;
default:
ShouldNotReachHere();
break;
}
// Note: byte_no also appears in TemplateTable::resolve.
if (byte_no == 1) {
assert(invoke_code != Bytecodes::_invokevirtual &&
invoke_code != Bytecodes::_invokeinterface, "");
set_bytecode_1(invoke_code);
} else if (byte_no == 2) {
if (change_to_virtual) {
assert(invoke_code == Bytecodes::_invokeinterface, "");
// NOTE: THIS IS A HACK - BE VERY CAREFUL!!!
//
// Workaround for the case where we encounter an invokeinterface, but we
// should really have an _invokevirtual since the resolved method is a
// virtual method in java.lang.Object. This is a corner case in the spec
// but is presumably legal. javac does not generate this code.
//
// We set bytecode_1() to _invokeinterface, because that is the
// bytecode # used by the interpreter to see if it is resolved.
// We set bytecode_2() to _invokevirtual.
// See also interpreterRuntime.cpp. (8/25/2000)
// Only set resolved for the invokeinterface case if method is public.
// Otherwise, the method needs to be reresolved with caller for each
// interface call.
if (method->is_public()) set_bytecode_1(invoke_code);
} else {
assert(invoke_code == Bytecodes::_invokevirtual, "");
}
// set up for invokevirtual, even if linking for invokeinterface also:
set_bytecode_2(Bytecodes::_invokevirtual);
} else {
ShouldNotReachHere();
}
NOT_PRODUCT(verify(tty));
}
