Mercurial > hg > truffle
annotate src/share/vm/ci/ciType.hpp @ 1994:6cd6d394f280
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
7002546: regression on SpecJbb2005 on 7b118 comparing to 7b117 on small heaps
Summary: Relaxed assertion checking related to incremental_collection_failed flag to allow for ExplicitGCInvokesConcurrent behaviour where we do not want a failing scavenge to bail to a stop-world collection. Parameterized incremental_collection_will_fail() so we can selectively use, or not use, as appropriate, the statistical prediction at specific use sites. This essentially reverts the scavenge bail-out logic to what it was prior to some recent changes that had inadvertently started using the statistical prediction which can be noisy in the presence of bursty loads. Added some associated verbose non-product debugging messages.
Reviewed-by: johnc, tonyp
| author | ysr |
|---|---|
| date | Tue, 07 Dec 2010 21:55:53 -0800 |
| parents | f95d63e2154a |
| children | da91efe96a93 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2000, 2010, 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 | |
| 1972 | 25 #ifndef SHARE_VM_CI_CITYPE_HPP |
| 26 #define SHARE_VM_CI_CITYPE_HPP | |
| 27 | |
| 28 #include "ci/ciObject.hpp" | |
| 29 #include "oops/klassOop.hpp" | |
| 30 | |
| 0 | 31 // ciType |
| 32 // | |
| 33 // This class represents either a class (T_OBJECT), array (T_ARRAY), | |
| 34 // or one of the primitive types such as T_INT. | |
| 35 class ciType : public ciObject { | |
| 36 CI_PACKAGE_ACCESS | |
| 37 friend class ciKlass; | |
| 38 friend class ciReturnAddress; | |
| 39 | |
| 40 private: | |
| 41 BasicType _basic_type; | |
| 42 | |
| 43 ciType(BasicType t); // for the primitive types only | |
| 44 ciType(KlassHandle k); // for subclasses (reference types) | |
| 45 ciType(ciKlass* klass); // for unloaded types | |
| 46 | |
| 47 const char* type_string() { return "ciType"; } | |
| 48 | |
| 49 void print_impl(outputStream* st); | |
| 50 | |
| 51 // Distinguished instances of primitive ciTypes.. | |
| 52 static ciType* _basic_types[T_CONFLICT+1]; | |
| 53 | |
| 54 public: | |
| 55 BasicType basic_type() const { return _basic_type; } | |
| 56 | |
| 57 // Returns true iff the types are identical, or if both are klasses | |
| 58 // and the is_subtype_of relation holds between the klasses. | |
| 59 bool is_subtype_of(ciType* type); | |
| 60 | |
| 61 // Get the instance of java.lang.Class corresponding to this type. | |
| 62 // There are mirrors for instance, array, and primitive types (incl. void). | |
| 63 virtual ciInstance* java_mirror(); | |
| 64 | |
| 65 // Get the class which "boxes" (or "wraps") values of this type. | |
| 66 // Example: short is boxed by java.lang.Short, etc. | |
| 67 // Returns self if it is a reference type. | |
| 68 // Returns NULL for void, since null is used in such cases. | |
| 69 ciKlass* box_klass(); | |
| 70 | |
| 71 // Returns true if this is not a klass or array (i.e., not a reference type). | |
| 72 bool is_primitive_type() const { return basic_type() != T_OBJECT && basic_type() != T_ARRAY; } | |
| 73 int size() const { return type2size[basic_type()]; } | |
| 74 bool is_void() const { return basic_type() == T_VOID; } | |
| 75 bool is_one_word() const { return size() == 1; } | |
| 76 bool is_two_word() const { return size() == 2; } | |
| 77 | |
| 78 // What kind of ciObject is this? | |
| 79 bool is_type() { return true; } | |
| 80 bool is_classless() const { return is_primitive_type(); } | |
| 81 | |
| 82 virtual void print_name_on(outputStream* st); | |
| 83 void print_name() { | |
| 84 print_name_on(tty); | |
| 85 } | |
| 86 | |
| 87 static ciType* make(BasicType t); | |
| 88 }; | |
| 89 | |
| 90 | |
| 91 // ciReturnAddress | |
| 92 // | |
| 93 // This class represents the type of a specific return address in the | |
| 94 // bytecodes. | |
| 95 class ciReturnAddress : public ciType { | |
| 96 CI_PACKAGE_ACCESS | |
| 97 | |
| 98 private: | |
| 99 // The bci of this return address. | |
| 100 int _bci; | |
| 101 | |
| 102 ciReturnAddress(int bci); | |
| 103 | |
| 104 const char* type_string() { return "ciReturnAddress"; } | |
| 105 | |
| 106 void print_impl(outputStream* st); | |
| 107 | |
| 108 public: | |
| 109 bool is_return_address() { return true; } | |
| 110 | |
| 111 int bci() { return _bci; } | |
| 112 | |
| 113 static ciReturnAddress* make(int bci); | |
| 114 }; | |
| 1972 | 115 |
| 116 #endif // SHARE_VM_CI_CITYPE_HPP |