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1 /*
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2 * Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 class StackValue : public ResourceObj {
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26 private:
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27 BasicType _type;
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28 intptr_t _i; // Blank java stack slot value
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29 Handle _o; // Java stack slot value interpreted as a Handle
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30 public:
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31
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32 StackValue(intptr_t value) {
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33 _type = T_INT;
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34 _i = value;
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35 }
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36
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37 StackValue(Handle value) {
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38 _type = T_OBJECT;
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39 _o = value;
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40 }
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41
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42 StackValue() {
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43 _type = T_CONFLICT;
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44 _i = 0;
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45 }
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46
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47 // Only used during deopt- preserve object type.
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48 StackValue(intptr_t o, BasicType t) {
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49 assert(t == T_OBJECT, "should not be used");
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50 _type = t;
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51 _i = o;
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52 }
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53
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54 Handle get_obj() const {
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55 assert(type() == T_OBJECT, "type check");
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56 return _o;
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57 }
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58
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59 void set_obj(Handle value) {
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60 assert(type() == T_OBJECT, "type check");
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61 _o = value;
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62 }
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63
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64 intptr_t get_int() const {
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65 assert(type() == T_INT, "type check");
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66 return _i;
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67 }
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68
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69 // For special case in deopt.
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70 intptr_t get_int(BasicType t) const {
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71 assert(t == T_OBJECT && type() == T_OBJECT, "type check");
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72 return _i;
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73 }
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74
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75 void set_int(intptr_t value) {
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76 assert(type() == T_INT, "type check");
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77 _i = value;
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78 }
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79
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80 BasicType type() const { return _type; }
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81
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82 bool equal(StackValue *value) {
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83 if (_type != value->_type) return false;
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84 if (_type == T_OBJECT)
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85 return (_o == value->_o);
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86 else {
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87 assert(_type == T_INT, "sanity check");
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88 // [phh] compare only low addressed portions of intptr_t slots
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89 return (*(int *)&_i == *(int *)&value->_i);
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90 }
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91 }
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92
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93 static StackValue* create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv);
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94 static BasicLock* resolve_monitor_lock(const frame* fr, Location location);
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95
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96 #ifndef PRODUCT
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97 public:
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98 // Printing
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99 void print_on(outputStream* st) const;
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100 #endif
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101 };
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