1/* 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_RUNTIME_STACKVALUE_HPP 26#define SHARE_VM_RUNTIME_STACKVALUE_HPP 27 28#include "code/location.hpp" 29#include "runtime/handles.hpp" 30 31class StackValue : public ResourceObj { 32 private: 33 BasicType _type; 34 intptr_t _i; // Blank java stack slot value 35 Handle _o; // Java stack slot value interpreted as a Handle 36 public: 37 38 StackValue(intptr_t value) { 39 _type = T_INT; 40 _i = value; 41 } 42 43 StackValue(Handle value, intptr_t scalar_replaced = 0) { 44 _type = T_OBJECT; 45 _i = scalar_replaced; 46 _o = value; 47 assert(_i == 0 || _o.is_null(), "not null object should not be marked as scalar replaced"); 48 } 49 50 StackValue() { 51 _type = T_CONFLICT; 52 _i = 0; 53 } 54 55 // Only used during deopt- preserve object type. 56 StackValue(intptr_t o, BasicType t) { 57 assert(t == T_OBJECT, "should not be used"); 58 _type = t; 59 _i = o; 60 } 61 62 Handle get_obj() const { 63 assert(type() == T_OBJECT, "type check"); 64 return _o; 65 } 66 67 bool obj_is_scalar_replaced() const { 68 assert(type() == T_OBJECT, "type check"); 69 return _i != 0; 70 } 71 72 void set_obj(Handle value) { 73 assert(type() == T_OBJECT, "type check"); 74 _o = value; 75 } 76 77 intptr_t get_int() const { 78 assert(type() == T_INT, "type check"); 79 return _i; 80 } 81 82 // For special case in deopt. 83 intptr_t get_int(BasicType t) const { 84 assert(t == T_OBJECT && type() == T_OBJECT, "type check"); 85 return _i; 86 } 87 88 void set_int(intptr_t value) { 89 assert(type() == T_INT, "type check"); 90 _i = value; 91 } 92 93 BasicType type() const { return _type; } 94 95 bool equal(StackValue *value) { 96 if (_type != value->_type) return false; 97 if (_type == T_OBJECT) 98 return (_o == value->_o); 99 else { 100 assert(_type == T_INT, "sanity check"); 101 // [phh] compare only low addressed portions of intptr_t slots 102 return (*(int *)&_i == *(int *)&value->_i); 103 } 104 } 105 106 static StackValue* create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv); 107 static BasicLock* resolve_monitor_lock(const frame* fr, Location location); 108 109#ifndef PRODUCT 110 public: 111 // Printing 112 void print_on(outputStream* st) const; 113#endif 114}; 115 116#endif // SHARE_VM_RUNTIME_STACKVALUE_HPP 117