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/*
* Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#ifndef SHARE_RUNTIME_STACKVALUE_HPP
#define SHARE_RUNTIME_STACKVALUE_HPP
#include "code/location.hpp"
#include "runtime/handles.hpp"
class BasicLock;
class frame;
class RegisterMap;
class ScopeValue;
class StackValue : public ResourceObj {
private:
BasicType _type;
intptr_t _integer_value; // Blank java stack slot value
Handle _handle_value; // Java stack slot value interpreted as a Handle
public:
StackValue(intptr_t value) {
_type = T_INT;
_integer_value = value;
}
StackValue(Handle value, intptr_t scalar_replaced = 0) {
_type = T_OBJECT;
_integer_value = scalar_replaced;
_handle_value = value;
assert(_integer_value == 0 || _handle_value.is_null(), "not null object should not be marked as scalar replaced");
}
StackValue() {
_type = T_CONFLICT;
_integer_value = 0;
}
// Only used during deopt- preserve object type.
StackValue(intptr_t o, BasicType t) {
assert(t == T_OBJECT, "should not be used");
_type = t;
_integer_value = o;
}
Handle get_obj() const {
assert(type() == T_OBJECT, "type check");
return _handle_value;
}
bool obj_is_scalar_replaced() const {
assert(type() == T_OBJECT, "type check");
return _integer_value != 0;
}
void set_obj(Handle value) {
assert(type() == T_OBJECT, "type check");
_handle_value = value;
}
intptr_t get_int() const {
assert(type() == T_INT, "type check");
return _integer_value;
}
// For special case in deopt.
intptr_t get_int(BasicType t) const {
assert(t == T_OBJECT && type() == T_OBJECT, "type check");
return _integer_value;
}
void set_int(intptr_t value) {
assert(type() == T_INT, "type check");
_integer_value = value;
}
BasicType type() const { return _type; }
bool equal(StackValue *value) {
if (_type != value->_type) return false;
if (_type == T_OBJECT)
return (_handle_value == value->_handle_value);
else {
assert(_type == T_INT, "sanity check");
// [phh] compare only low addressed portions of intptr_t slots
return (*(int *)&_integer_value == *(int *)&value->_integer_value);
}
}
static StackValue* create_stack_value_from_oop_location(stackChunkOop chunk, void* addr);
static StackValue* create_stack_value_from_narrowOop_location(stackChunkOop chunk, void* addr, bool is_register);
static BasicLock* resolve_monitor_lock(const frame* fr, Location location);
template<typename RegisterMapT>
static StackValue* create_stack_value(const frame* fr, const RegisterMapT* reg_map, ScopeValue* sv);
template<typename RegisterMapT>
static address stack_value_address(const frame* fr, const RegisterMapT* reg_map, ScopeValue* sv);
#ifndef PRODUCT
public:
// Printing
void print_on(outputStream* st) const;
#endif
private:
template<typename RegisterMapT>
static StackValue* create_stack_value(ScopeValue* sv, address value_addr, const RegisterMapT* reg_map);
};
#endif // SHARE_RUNTIME_STACKVALUE_HPP
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