Mercurial > jdk8-mips64-public > hotspot / annotate
src/share/vm/ci/ciBaseObject.hpp@01522ca68fc7 (annotated)
src/share/vm/ci/ciBaseObject.hpp
Tue, 18 Jun 2013 12:31:07 -0700
- author
- johnc
- date
- Tue, 18 Jun 2013 12:31:07 -0700
- changeset 5277
- 01522ca68fc7
- parent 0
- f90c822e73f8
- permissions
- -rw-r--r--
8015237: Parallelize string table scanning during strong root processing
Summary: Parallelize the scanning of the intern string table by having each GC worker claim a given number of buckets. Changes were also reviewed by Per Liden <per.liden@oracle.com>.
Reviewed-by: tschatzl, stefank, twisti
| aoqi@0 | 1 | /* |
| aoqi@0 | 2 | * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. |
| aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| aoqi@0 | 4 | * |
| aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
| aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| aoqi@0 | 7 | * published by the Free Software Foundation. |
| aoqi@0 | 8 | * |
| aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| aoqi@0 | 13 | * accompanied this code). |
| aoqi@0 | 14 | * |
| aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
| aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| aoqi@0 | 18 | * |
| aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
| aoqi@0 | 21 | * questions. |
| aoqi@0 | 22 | * |
| aoqi@0 | 23 | */ |
| aoqi@0 | 24 | |
| aoqi@0 | 25 | #ifndef SHARE_VM_CI_CIBASEOBJECT_HPP |
| aoqi@0 | 26 | #define SHARE_VM_CI_CIBASEOBJECT_HPP |
| aoqi@0 | 27 | |
| aoqi@0 | 28 | #include "ci/ciClassList.hpp" |
| aoqi@0 | 29 | #include "memory/allocation.hpp" |
| aoqi@0 | 30 | #include "runtime/handles.hpp" |
| aoqi@0 | 31 | #include "runtime/jniHandles.hpp" |
| aoqi@0 | 32 | |
| aoqi@0 | 33 | // ciBaseObject |
| aoqi@0 | 34 | // |
| aoqi@0 | 35 | // This class represents an oop in the HotSpot virtual machine. |
| aoqi@0 | 36 | // Its subclasses are structured in a hierarchy which mirrors |
| aoqi@0 | 37 | // an aggregate of the VM's oop and klass hierarchies (see |
| aoqi@0 | 38 | // oopHierarchy.hpp). Each instance of ciBaseObject holds a handle |
| aoqi@0 | 39 | // to a corresponding oop on the VM side and provides routines |
| aoqi@0 | 40 | // for accessing the information in its oop. By using the ciBaseObject |
| aoqi@0 | 41 | // hierarchy for accessing oops in the VM, the compiler ensures |
| aoqi@0 | 42 | // that it is safe with respect to garbage collection; that is, |
| aoqi@0 | 43 | // GC and compilation can proceed independently without |
| aoqi@0 | 44 | // interference. |
| aoqi@0 | 45 | // |
| aoqi@0 | 46 | // Within the VM, the oop and klass hierarchies are separate. |
| aoqi@0 | 47 | // The compiler interface does not preserve this separation -- |
| aoqi@0 | 48 | // the distinction between `Klass*' and `Klass' are not |
| aoqi@0 | 49 | // reflected in the interface and instead the Klass hierarchy |
| aoqi@0 | 50 | // is directly modeled as the subclasses of ciKlass. |
| aoqi@0 | 51 | class ciBaseObject : public ResourceObj { |
| aoqi@0 | 52 | CI_PACKAGE_ACCESS |
| aoqi@0 | 53 | friend class ciEnv; |
| aoqi@0 | 54 | |
| aoqi@0 | 55 | protected: |
| aoqi@0 | 56 | uint _ident; |
| aoqi@0 | 57 | |
| aoqi@0 | 58 | enum { FLAG_BITS = 1 }; |
| aoqi@0 | 59 | enum { |
| aoqi@0 | 60 | SCAVENGABLE_FLAG = 1 |
| aoqi@0 | 61 | }; |
| aoqi@0 | 62 | protected: |
| aoqi@0 | 63 | ciBaseObject(): _ident(0) {} |
| aoqi@0 | 64 | |
| aoqi@0 | 65 | virtual const char* type_string() { return "ciBaseObject"; } |
| aoqi@0 | 66 | |
| aoqi@0 | 67 | void set_ident(uint id); |
| aoqi@0 | 68 | |
| aoqi@0 | 69 | public: |
| aoqi@0 | 70 | // A number unique to this object. |
| aoqi@0 | 71 | uint ident(); |
| aoqi@0 | 72 | |
| aoqi@0 | 73 | // What kind of ciBaseObject is this? |
| aoqi@0 | 74 | virtual bool is_symbol() const { return false; } |
| aoqi@0 | 75 | virtual bool is_object() const { return false; } |
| aoqi@0 | 76 | virtual bool is_metadata() const { return false; } |
| aoqi@0 | 77 | |
| aoqi@0 | 78 | ciSymbol* as_symbol() { |
| aoqi@0 | 79 | assert(is_symbol(), "must be"); |
| aoqi@0 | 80 | return (ciSymbol*)this; |
| aoqi@0 | 81 | } |
| aoqi@0 | 82 | ciObject* as_object() { |
| aoqi@0 | 83 | assert(is_object(), "must be"); |
| aoqi@0 | 84 | return (ciObject*)this; |
| aoqi@0 | 85 | } |
| aoqi@0 | 86 | ciMetadata* as_metadata() { |
| aoqi@0 | 87 | assert(is_metadata(), "must be"); |
| aoqi@0 | 88 | return (ciMetadata*)this; |
| aoqi@0 | 89 | } |
| aoqi@0 | 90 | }; |
| aoqi@0 | 91 | #endif // SHARE_VM_CI_CIBASEOBJECT_HPP |
