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7171890: C1: add Class.isInstance intrinsic

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Class.cast which calls Class.isInstance is heavily used by the new JSR 292 implementation

Reviewed-by: roland
This commit is contained in:
Krystal Mok 2012-06-05 10:15:27 +02:00 • committed by Roland Westrelin
parent 33799389d4
commit 6d29429c4e
6 changed files with 70 additions and 0 deletions
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22
hotspot/src/share/vm/c1/c1_Canonicalizer.cpp
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@ -456,6 +456,28 @@ void Canonicalizer::do_Intrinsic (Intrinsic* x) {
}
break;
}
case vmIntrinsics::_isInstance : {
assert(x->number_of_arguments() == 2, "wrong type");
InstanceConstant* c = x->argument_at(0)->type()->as_InstanceConstant();
if (c != NULL && !c->value()->is_null_object()) {
// ciInstance::java_mirror_type() returns non-NULL only for Java mirrors
ciType* t = c->value()->as_instance()->java_mirror_type();
if (t->is_klass()) {
// substitute cls.isInstance(obj) of a constant Class into
// an InstantOf instruction
InstanceOf* i = new InstanceOf(t->as_klass(), x->argument_at(1), x->state());
set_canonical(i);
// and try to canonicalize even further
do_InstanceOf(i);
} else {
assert(t->is_primitive_type(), "should be a primitive type");
// cls.isInstance(obj) always returns false for primitive classes
set_constant(0);
}
}
break;
}
}
}