duke@435: /*
stefank@2314:  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #ifndef SHARE_VM_RUNTIME_STACKVALUE_HPP
stefank@2314: #define SHARE_VM_RUNTIME_STACKVALUE_HPP
stefank@2314: 
stefank@2314: #include "code/location.hpp"
stefank@2314: #include "runtime/handles.hpp"
stefank@2314: #include "utilities/top.hpp"
stefank@2314: 
duke@435: class StackValue : public ResourceObj {
duke@435:  private:
duke@435:   BasicType _type;
duke@435:   intptr_t  _i; // Blank java stack slot value
duke@435:   Handle    _o; // Java stack slot value interpreted as a Handle
duke@435:  public:
duke@435: 
duke@435:   StackValue(intptr_t value) {
duke@435:     _type  = T_INT;
duke@435:     _i     = value;
duke@435:   }
duke@435: 
kvn@1253:   StackValue(Handle value, intptr_t scalar_replaced = 0) {
duke@435:     _type    = T_OBJECT;
kvn@1253:     _i       = scalar_replaced;
duke@435:     _o       = value;
kvn@1253:     assert(_i == 0 || _o.is_null(), "not null object should not be marked as scalar replaced");
duke@435:   }
duke@435: 
duke@435:   StackValue() {
duke@435:     _type   = T_CONFLICT;
duke@435:     _i      = 0;
duke@435:   }
duke@435: 
duke@435:   // Only used during deopt- preserve object type.
duke@435:   StackValue(intptr_t o, BasicType t) {
duke@435:     assert(t == T_OBJECT, "should not be used");
duke@435:     _type   = t;
duke@435:     _i      = o;
duke@435:   }
duke@435: 
duke@435:   Handle get_obj() const {
duke@435:     assert(type() == T_OBJECT, "type check");
duke@435:     return _o;
duke@435:   }
duke@435: 
kvn@1253:   bool obj_is_scalar_replaced() const {
kvn@1253:     assert(type() == T_OBJECT, "type check");
kvn@1253:     return _i != 0;
kvn@1253:   }
kvn@1253: 
duke@435:   void set_obj(Handle value) {
duke@435:     assert(type() == T_OBJECT, "type check");
duke@435:     _o = value;
duke@435:   }
duke@435: 
duke@435:   intptr_t get_int() const {
duke@435:     assert(type() == T_INT, "type check");
duke@435:     return _i;
duke@435:   }
duke@435: 
duke@435:   // For special case in deopt.
duke@435:   intptr_t get_int(BasicType t) const {
duke@435:     assert(t == T_OBJECT && type() == T_OBJECT, "type check");
duke@435:     return _i;
duke@435:   }
duke@435: 
duke@435:   void set_int(intptr_t value) {
duke@435:     assert(type() == T_INT, "type check");
duke@435:     _i = value;
duke@435:   }
duke@435: 
duke@435:   BasicType type() const { return  _type; }
duke@435: 
duke@435:   bool equal(StackValue *value) {
duke@435:     if (_type != value->_type) return false;
duke@435:     if (_type == T_OBJECT)
duke@435:       return (_o == value->_o);
duke@435:     else {
duke@435:       assert(_type == T_INT, "sanity check");
duke@435:       // [phh] compare only low addressed portions of intptr_t slots
duke@435:       return (*(int *)&_i == *(int *)&value->_i);
duke@435:     }
duke@435:   }
duke@435: 
duke@435:   static StackValue* create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv);
duke@435:   static BasicLock*  resolve_monitor_lock(const frame* fr, Location location);
duke@435: 
duke@435: #ifndef PRODUCT
duke@435:  public:
duke@435:   // Printing
duke@435:   void print_on(outputStream* st) const;
duke@435: #endif
duke@435: };
stefank@2314: 
stefank@2314: #endif // SHARE_VM_RUNTIME_STACKVALUE_HPP