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 #include "utilities/top.hpp" 31 32 class StackValue : public ResourceObj { 33 private: 34 BasicType _type; 35 intptr_t _i; // Blank java stack slot value 36 Handle _o; // Java stack slot value interpreted as a Handle 37 public: 38 39 StackValue(intptr_t value) { 40 _type = T_INT; 41 _i = value; 42 } 43 44 StackValue(Handle value, intptr_t scalar_replaced = 0) { 45 _type = T_OBJECT; 46 _i = scalar_replaced; 47 _o = value; 48 assert(_i == 0 || _o.is_null(), "not null object should not be marked as scalar replaced"); 49 } 50 51 StackValue() { 52 _type = T_CONFLICT; 53 _i = 0; 54 } 55 56 // Only used during deopt- preserve object type. 57 StackValue(intptr_t o, BasicType t) { 58 assert(t == T_OBJECT, "should not be used"); 59 _type = t; 60 _i = o; 61 } 62 63 Handle get_obj() const { 64 assert(type() == T_OBJECT, "type check"); 65 return _o; 66 } 67 68 bool obj_is_scalar_replaced() const { 69 assert(type() == T_OBJECT, "type check"); 70 return _i != 0; 71 } 72 73 void set_obj(Handle value) { 74 assert(type() == T_OBJECT, "type check"); 75 _o = value; 76 } 77 78 intptr_t get_int() const { 79 assert(type() == T_INT, "type check"); 80 return _i; 81 } 82 83 // For special case in deopt. 84 intptr_t get_int(BasicType t) const { 85 assert(t == T_OBJECT && type() == T_OBJECT, "type check"); 86 return _i; 87 } 88 89 void set_int(intptr_t value) { 90 assert(type() == T_INT, "type check"); 91 _i = value; 92 } 93 94 BasicType type() const { return _type; } 95 96 bool equal(StackValue *value) { 97 if (_type != value->_type) return false; 98 if (_type == T_OBJECT) 99 return (_o == value->_o); 100 else { 101 assert(_type == T_INT, "sanity check"); 102 // [phh] compare only low addressed portions of intptr_t slots 103 return (*(int *)&_i == *(int *)&value->_i); 104 } 105 } 106 107 static StackValue* create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv); 108 static BasicLock* resolve_monitor_lock(const frame* fr, Location location); 109 110 #ifndef PRODUCT 111 public: 112 // Printing 113 void print_on(outputStream* st) const; 114 #endif 115 }; 116 117 #endif // SHARE_VM_RUNTIME_STACKVALUE_HPP