void Canonicalizer::do_ArrayLength (ArrayLength* x) {
NewArray* array = x->array()->as_NewArray();
if (array != NULL && array->length() != NULL) {
Constant* length = array->length()->as_Constant();
if (length != NULL) {
// do not use the Constant itself, but create a new Constant
// with same value Otherwise a Constant is live over multiple
// blocks without being registered in a state array.
assert(length->type()->as_IntConstant() != NULL, "array length must be integer");
set_constant(length->type()->as_IntConstant()->value());
}
} else {
LoadField* lf = x->array()->as_LoadField();
if (lf != NULL) {
ciField* field = lf->field();
if (field->is_constant() && field->is_static()) {
// final static field
ciObject* c = field->constant_value().as_object();
if (c->is_array()) {
ciArray* array = (ciArray*) c;
set_constant(array->length());
}
}
}
}
}
void Canonicalizer::do_ArrayLength (ArrayLength* x) {
NewArray* na;
Constant* ct;
LoadField* lf;
if ((na = x->array()->as_NewArray()) != NULL) {
// New arrays might have the known length.
// Do not use the Constant itself, but create a new Constant
// with same value Otherwise a Constant is live over multiple
// blocks without being registered in a state array.
Constant* length;
if (na->length() != NULL &&
(length = na->length()->as_Constant()) != NULL) {
assert(length->type()->as_IntConstant() != NULL, "array length must be integer");
set_constant(length->type()->as_IntConstant()->value());
}
} else if ((ct = x->array()->as_Constant()) != NULL) {
// Constant arrays have constant lengths.
ArrayConstant* cnst = ct->type()->as_ArrayConstant();
if (cnst != NULL) {
set_constant(cnst->value()->length());
}
} else if ((lf = x->array()->as_LoadField()) != NULL) {
ciField* field = lf->field();
if (field->is_static_constant()) {
assert(PatchALot || ScavengeRootsInCode < 2, "Constant field loads are folded during parsing");
ciObject* c = field->constant_value().as_object();
if (!c->is_null_object()) {
set_constant(c->as_array()->length());
}
}
}
}
void Canonicalizer::do_ArrayLength (ArrayLength* x) {
NewArray* array = x->array()->as_NewArray();
if (array != NULL && array->length() != NULL) {
Constant* length = array->length()->as_Constant();
if (length != NULL) {
set_canonical(length);
}
}
}