Mercurial > hg > truffle
annotate src/share/vm/runtime/stackValue.hpp @ 1721:413ad0331a0c
6977924: Changes for 6975078 produce build error with certain gcc versions
Summary: The changes introduced for 6975078 assign badHeapOopVal to the _allocation field in the ResourceObj class. In 32 bit linux builds with certain versions of gcc this assignment will be flagged as an error while compiling allocation.cpp. In 32 bit builds the constant value badHeapOopVal (which is cast to an intptr_t) is negative. The _allocation field is typed as an unsigned intptr_t and gcc catches this as an error.
Reviewed-by: jcoomes, ysr, phh
| author | johnc |
|---|---|
| date | Wed, 18 Aug 2010 10:59:06 -0700 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 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 | |
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6837472: com/sun/jdi/MonitorFrameInfo.java fails with AggressiveOpts in 6u14
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37 StackValue(Handle value, intptr_t scalar_replaced = 0) { |
| 0 | 38 _type = T_OBJECT; |
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39 _i = scalar_replaced; |
| 0 | 40 _o = value; |
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41 assert(_i == 0 || _o.is_null(), "not null object should not be marked as scalar replaced"); |
| 0 | 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 | |
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61 bool obj_is_scalar_replaced() const { |
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62 assert(type() == T_OBJECT, "type check"); |
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63 return _i != 0; |
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6837472: com/sun/jdi/MonitorFrameInfo.java fails with AggressiveOpts in 6u14
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64 } |
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6837472: com/sun/jdi/MonitorFrameInfo.java fails with AggressiveOpts in 6u14
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65 |
| 0 | 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 }; |