1 /* 2 * Copyright (c) 1997, 2024, 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 frame; 33 class RegisterMap; 34 class ScopeValue; 35 36 class StackValue : public ResourceObj { 37 private: 38 BasicType _type; 39 intptr_t _integer_value; // Blank java stack slot value 40 Handle _handle_value; // Java stack slot value interpreted as a Handle 41 public: 42 43 StackValue(intptr_t value) { 44 _type = T_INT; 45 _integer_value = value; 46 } 47 48 StackValue(Handle value, intptr_t scalar_replaced = 0) { 49 _type = T_OBJECT; 50 _integer_value = scalar_replaced; 51 _handle_value = value; 52 assert(_integer_value == 0 || _handle_value.is_null(), "not null object should not be marked as scalar replaced"); 53 } 54 55 StackValue() { 56 _type = T_CONFLICT; 57 _integer_value = 0; 58 } 59 60 // Only used during deopt- preserve object type. 61 StackValue(intptr_t o, BasicType t) { 62 assert(t == T_OBJECT, "should not be used"); 63 _type = t; 64 _integer_value = o; 65 } 66 67 Handle get_obj() const { 68 assert(type() == T_OBJECT, "type check"); 69 return _handle_value; 70 } 71 72 bool obj_is_scalar_replaced() const { 73 assert(type() == T_OBJECT, "type check"); 74 return _integer_value != 0; 75 } 76 77 void set_obj(Handle value) { 78 assert(type() == T_OBJECT, "type check"); 79 _handle_value = value; 80 } 81 82 intptr_t get_intptr() const { 83 assert(type() == T_INT, "type check"); 84 return _integer_value; 85 } 86 87 // For special case in deopt. 88 intptr_t get_intptr(BasicType t) const { 89 assert(t == T_OBJECT && type() == T_OBJECT, "type check"); 90 return _integer_value; 91 } 92 93 void set_intptr(intptr_t value) { 94 assert(type() == T_INT, "type check"); 95 _integer_value = value; 96 } 97 98 // The jint value is always at offset 0 of the stack slot. On big endian platforms 99 // this is the location of the high word therefore we cannot just cast to jint. 100 jint get_jint() const { 101 assert(type() == T_INT, "type check"); 102 return *(jint*)&_integer_value; 103 } 104 105 void set_jint(jint value) { 106 assert(type() == T_INT, "type check"); 107 *(jint*)&_integer_value = value; 108 } 109 110 BasicType type() const { return _type; } 111 112 bool equal(StackValue *value) { 113 if (_type != value->_type) return false; 114 if (_type == T_OBJECT) 115 return (_handle_value == value->_handle_value); 116 else { 117 assert(_type == T_INT, "sanity check"); 118 // [phh] compare only low addressed portions of intptr_t slots 119 return (*(int *)&_integer_value == *(int *)&value->_integer_value); 120 } 121 } 122 123 static StackValue* create_stack_value_from_oop_location(stackChunkOop chunk, void* addr); 124 static StackValue* create_stack_value_from_narrowOop_location(stackChunkOop chunk, void* addr, bool is_register); 125 126 static BasicLock* resolve_monitor_lock(const frame& fr, Location location); 127 128 template<typename RegisterMapT> 129 static StackValue* create_stack_value(const frame* fr, const RegisterMapT* reg_map, ScopeValue* sv); 130 131 template<typename RegisterMapT> 132 static address stack_value_address(const frame* fr, const RegisterMapT* reg_map, ScopeValue* sv); 133 134 #ifndef PRODUCT 135 public: 136 // Printing 137 void print_on(outputStream* st) const; 138 #endif 139 140 private: 141 template<typename RegisterMapT> 142 static StackValue* create_stack_value(ScopeValue* sv, address value_addr, const RegisterMapT* reg_map); 143 }; 144 145 #endif // SHARE_RUNTIME_STACKVALUE_HPP --- EOF ---