1 /* 2 * Copyright (c) 1997, 2009, 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 class StackValue : public ResourceObj { 26 private: 27 BasicType _type; 28 intptr_t _i; // Blank java stack slot value 29 Handle _o; // Java stack slot value interpreted as a Handle 30 public: 31 32 StackValue(intptr_t value) { 33 _type = T_INT; 34 _i = value; 35 } 36 37 StackValue(Handle value, intptr_t scalar_replaced = 0) { 38 _type = T_OBJECT; 39 _i = scalar_replaced; 40 _o = value; 41 assert(_i == 0 || _o.is_null(), "not null object should not be marked as scalar replaced"); 42 } 43 44 StackValue() { 45 _type = T_CONFLICT; 46 _i = 0; 47 } 48 49 // Only used during deopt- preserve object type. 50 StackValue(intptr_t o, BasicType t) { 51 assert(t == T_OBJECT, "should not be used"); 52 _type = t; 53 _i = o; 54 } 55 56 Handle get_obj() const { 57 assert(type() == T_OBJECT, "type check"); 58 return _o; 59 } 60 61 bool obj_is_scalar_replaced() const { 62 assert(type() == T_OBJECT, "type check"); 63 return _i != 0; 64 } 65 66 void set_obj(Handle value) { 67 assert(type() == T_OBJECT, "type check"); 68 _o = value; 69 } 70 71 intptr_t get_int() const { 72 assert(type() == T_INT, "type check"); 73 return _i; 74 } 75 76 // For special case in deopt. 77 intptr_t get_int(BasicType t) const { 78 assert(t == T_OBJECT && type() == T_OBJECT, "type check"); 79 return _i; 80 } 81 82 void set_int(intptr_t value) { 83 assert(type() == T_INT, "type check"); 84 _i = value; 85 } 86 87 BasicType type() const { return _type; } 88 89 bool equal(StackValue *value) { 90 if (_type != value->_type) return false; 91 if (_type == T_OBJECT) 92 return (_o == value->_o); 93 else { 94 assert(_type == T_INT, "sanity check"); 95 // [phh] compare only low addressed portions of intptr_t slots 96 return (*(int *)&_i == *(int *)&value->_i); 97 } 98 } 99 100 static StackValue* create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv); 101 static BasicLock* resolve_monitor_lock(const frame* fr, Location location); 102 103 #ifndef PRODUCT 104 public: 105 // Printing 106 void print_on(outputStream* st) const; 107 #endif 108 };