1 /* 2 * Copyright (c) 1997, 2020, 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_RUNTIME_STACKVALUE_HPP 26 #define SHARE_RUNTIME_STACKVALUE_HPP 27 28 #include "code/location.hpp" 29 #include "runtime/handles.hpp" 30 31 class BasicLock; 32 class RegisterMap; 33 class ScopeValue; 34 35 class StackValue : public ResourceObj { 36 private: 37 BasicType _type; 38 intptr_t _integer_value; // Blank java stack slot value 39 Handle _handle_value; // Java stack slot value interpreted as a Handle 40 public: 41 42 StackValue(intptr_t value) { 43 _type = T_INT; 44 _integer_value = value; 45 } 46 47 StackValue(Handle value, intptr_t scalar_replaced = 0) { 48 _type = T_OBJECT; 49 _integer_value = scalar_replaced; 50 _handle_value = value; 51 assert(_integer_value == 0 || _handle_value.is_null(), "not null object should not be marked as scalar replaced"); 52 } 53 54 StackValue() { 55 _type = T_CONFLICT; 56 _integer_value = 0; 57 } 58 59 // Only used during deopt- preserve object type. 60 StackValue(intptr_t o, BasicType t) { 61 assert(t == T_OBJECT, "should not be used"); 62 _type = t; 63 _integer_value = o; 64 } 65 66 Handle get_obj() const { 67 assert(type() == T_OBJECT, "type check"); 68 return _handle_value; 69 } 70 71 bool obj_is_scalar_replaced() const { 72 assert(type() == T_OBJECT, "type check"); 73 return _integer_value != 0; 74 } 75 76 void set_obj(Handle value) { 77 assert(type() == T_OBJECT, "type check"); 78 _integer_value = 0; 79 _handle_value = value; 80 } 81 82 intptr_t get_int() const { 83 assert(type() == T_INT, "type check"); 84 return _integer_value; 85 } 86 87 // For special case in deopt. 88 intptr_t get_int(BasicType t) const { 89 assert(t == T_OBJECT && type() == T_OBJECT, "type check"); 90 return _integer_value; 91 } 92 93 void set_int(intptr_t value) { 94 assert(type() == T_INT, "type check"); 95 _integer_value = value; 96 } 97 98 BasicType type() const { return _type; } 99 100 bool equal(StackValue *value) { 101 if (_type != value->_type) return false; 102 if (_type == T_OBJECT) 103 return (_handle_value == value->_handle_value); 104 else { 105 assert(_type == T_INT, "sanity check"); 106 // [phh] compare only low addressed portions of intptr_t slots 107 return (*(int *)&_integer_value == *(int *)&value->_integer_value); 108 } 109 } 110 111 static StackValue* create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv); 112 static BasicLock* resolve_monitor_lock(const frame* fr, Location location); 113 114 #ifndef PRODUCT 115 public: 116 // Printing 117 void print_on(outputStream* st) const; 118 #endif 119 }; 120 121 #endif // SHARE_RUNTIME_STACKVALUE_HPP