1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/runtime/stackValue.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,117 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_RUNTIME_STACKVALUE_HPP
1.29 +#define SHARE_VM_RUNTIME_STACKVALUE_HPP
1.30 +
1.31 +#include "code/location.hpp"
1.32 +#include "runtime/handles.hpp"
1.33 +#include "utilities/top.hpp"
1.34 +
1.35 +class StackValue : public ResourceObj {
1.36 + private:
1.37 + BasicType _type;
1.38 + intptr_t _i; // Blank java stack slot value
1.39 + Handle _o; // Java stack slot value interpreted as a Handle
1.40 + public:
1.41 +
1.42 + StackValue(intptr_t value) {
1.43 + _type = T_INT;
1.44 + _i = value;
1.45 + }
1.46 +
1.47 + StackValue(Handle value, intptr_t scalar_replaced = 0) {
1.48 + _type = T_OBJECT;
1.49 + _i = scalar_replaced;
1.50 + _o = value;
1.51 + assert(_i == 0 || _o.is_null(), "not null object should not be marked as scalar replaced");
1.52 + }
1.53 +
1.54 + StackValue() {
1.55 + _type = T_CONFLICT;
1.56 + _i = 0;
1.57 + }
1.58 +
1.59 + // Only used during deopt- preserve object type.
1.60 + StackValue(intptr_t o, BasicType t) {
1.61 + assert(t == T_OBJECT, "should not be used");
1.62 + _type = t;
1.63 + _i = o;
1.64 + }
1.65 +
1.66 + Handle get_obj() const {
1.67 + assert(type() == T_OBJECT, "type check");
1.68 + return _o;
1.69 + }
1.70 +
1.71 + bool obj_is_scalar_replaced() const {
1.72 + assert(type() == T_OBJECT, "type check");
1.73 + return _i != 0;
1.74 + }
1.75 +
1.76 + void set_obj(Handle value) {
1.77 + assert(type() == T_OBJECT, "type check");
1.78 + _o = value;
1.79 + }
1.80 +
1.81 + intptr_t get_int() const {
1.82 + assert(type() == T_INT, "type check");
1.83 + return _i;
1.84 + }
1.85 +
1.86 + // For special case in deopt.
1.87 + intptr_t get_int(BasicType t) const {
1.88 + assert(t == T_OBJECT && type() == T_OBJECT, "type check");
1.89 + return _i;
1.90 + }
1.91 +
1.92 + void set_int(intptr_t value) {
1.93 + assert(type() == T_INT, "type check");
1.94 + _i = value;
1.95 + }
1.96 +
1.97 + BasicType type() const { return _type; }
1.98 +
1.99 + bool equal(StackValue *value) {
1.100 + if (_type != value->_type) return false;
1.101 + if (_type == T_OBJECT)
1.102 + return (_o == value->_o);
1.103 + else {
1.104 + assert(_type == T_INT, "sanity check");
1.105 + // [phh] compare only low addressed portions of intptr_t slots
1.106 + return (*(int *)&_i == *(int *)&value->_i);
1.107 + }
1.108 + }
1.109 +
1.110 + static StackValue* create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv);
1.111 + static BasicLock* resolve_monitor_lock(const frame* fr, Location location);
1.112 +
1.113 +#ifndef PRODUCT
1.114 + public:
1.115 + // Printing
1.116 + void print_on(outputStream* st) const;
1.117 +#endif
1.118 +};
1.119 +
1.120 +#endif // SHARE_VM_RUNTIME_STACKVALUE_HPP
