void HeapAddress::write_barrier_prolog() {
GUARANTEE(stack_type() == T_OBJECT, "write barrier should not be updated for non-object stores");
// allocate an address register for the write barrier implementation
set_address_register(RegisterAllocator::allocate());
// compute the effective address and store it in the address register
BinaryAssembler::Address address = compute_address_for(lo_offset());
code_generator()->leal(address_register(), address);
}
BinaryAssembler::Address HeapAddress::address_for(jint address_offset) {
// use the address register if available
if (has_address_register()) {
GUARANTEE(address_offset == lo_offset(), "the address register holds the address for the low offset");
return BinaryAssembler::Address(address_register());
}
// return the computed address
return compute_address_for(address_offset);
}
// get the platform dependant address for this address
BinaryAssembler::Address lo_address() {
return address_for(lo_offset());
}
