| /* |
| * Copyright (c) 1997, 2010, 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_VM_RUNTIME_STACKVALUE_HPP |
| #define SHARE_VM_RUNTIME_STACKVALUE_HPP |
| |
| #include "code/location.hpp" |
| #include "runtime/handles.hpp" |
| |
| class StackValue : public ResourceObj { |
| private: |
| BasicType _type; |
| intptr_t _i; // Blank java stack slot value |
| Handle _o; // Java stack slot value interpreted as a Handle |
| public: |
| |
| StackValue(intptr_t value) { |
| _type = T_INT; |
| _i = value; |
| } |
| |
| StackValue(Handle value, intptr_t scalar_replaced = 0) { |
| _type = T_OBJECT; |
| _i = scalar_replaced; |
| _o = value; |
| assert(_i == 0 || _o.is_null(), "not null object should not be marked as scalar replaced"); |
| } |
| |
| StackValue() { |
| _type = T_CONFLICT; |
| _i = 0; |
| } |
| |
| // Only used during deopt- preserve object type. |
| StackValue(intptr_t o, BasicType t) { |
| assert(t == T_OBJECT, "should not be used"); |
| _type = t; |
| _i = o; |
| } |
| |
| Handle get_obj() const { |
| assert(type() == T_OBJECT, "type check"); |
| return _o; |
| } |
| |
| bool obj_is_scalar_replaced() const { |
| assert(type() == T_OBJECT, "type check"); |
| return _i != 0; |
| } |
| |
| void set_obj(Handle value) { |
| assert(type() == T_OBJECT, "type check"); |
| _o = value; |
| } |
| |
| intptr_t get_int() const { |
| assert(type() == T_INT, "type check"); |
| return _i; |
| } |
| |
| // For special case in deopt. |
| intptr_t get_int(BasicType t) const { |
| assert(t == T_OBJECT && type() == T_OBJECT, "type check"); |
| return _i; |
| } |
| |
| void set_int(intptr_t value) { |
| assert(type() == T_INT, "type check"); |
| _i = value; |
| } |
| |
| BasicType type() const { return _type; } |
| |
| bool equal(StackValue *value) { |
| if (_type != value->_type) return false; |
| if (_type == T_OBJECT) |
| return (_o == value->_o); |
| else { |
| assert(_type == T_INT, "sanity check"); |
| // [phh] compare only low addressed portions of intptr_t slots |
| return (*(int *)&_i == *(int *)&value->_i); |
| } |
| } |
| |
| static StackValue* create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv); |
| static BasicLock* resolve_monitor_lock(const frame* fr, Location location); |
| |
| #ifndef PRODUCT |
| public: |
| // Printing |
| void print_on(outputStream* st) const; |
| #endif |
| }; |
| |
| #endif // SHARE_VM_RUNTIME_STACKVALUE_HPP |