address RegisterMap::pd_location(VMReg regname) const {
register_map_init();
assert(regname->is_reg(), "sanity check");
// Only the GPRs get handled this way
if( !regname->is_Register())
return NULL;
// don't talk about bad registers
if ((bad_mask & ((LocationValidType)1 << regname->value())) != 0) {
return NULL;
}
// Convert to a GPR
Register reg;
int second_word = 0;
// 32-bit registers for in, out and local
if (!regname->is_concrete()) {
// HMM ought to return NULL for any non-concrete (odd) vmreg
// this all tied up in the fact we put out double oopMaps for
// register locations. When that is fixed we'd will return NULL
// (or assert here).
reg = regname->prev()->as_Register();
#ifdef _LP64
second_word = sizeof(jint);
#else
return NULL;
#endif // _LP64
} else {
reg = regname->as_Register();
}
if (reg->is_out()) {
assert(_younger_window != NULL, "Younger window should be available");
return second_word + (address)&_younger_window[reg->after_save()->sp_offset_in_saved_window()];
}
if (reg->is_local() || reg->is_in()) {
assert(_window != NULL, "Window should be available");
return second_word + (address)&_window[reg->sp_offset_in_saved_window()];
}
// Only the window'd GPRs get handled this way; not the globals.
return NULL;
}
// Return true if single register but adjacent stack slots do not count
bool is_single_phys_reg() const {
return (_first->is_reg() && (_first->value() + 1 == _second->value()));
}