Mercurial > hg > truffle
annotate src/share/tools/MakeDeps/Platform.java @ 1716:be3f9c242c9d
6948538: CMS: BOT walkers can fall into object allocation and initialization cracks
Summary: GC workers now recognize an intermediate transient state of blocks which are allocated but have not yet completed initialization. blk_start() calls do not attempt to determine the size of a block in the transient state, rather waiting for the block to become initialized so that it is safe to query its size. Audited and ensured the order of initialization of object fields (klass, free bit and size) to respect block state transition protocol. Also included some new assertion checking code enabled in debug mode.
Reviewed-by: chrisphi, johnc, poonam
| author | ysr |
|---|---|
| date | Mon, 16 Aug 2010 15:58:42 -0700 |
| parents | c18cbe5936b8 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1999, 2005, 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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6941466: Oracle rebranding changes for Hotspot repositories
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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 /** Defines what must be specified for each platform. This class must | |
| 26 have a no-arg constructor. */ | |
| 27 | |
| 28 import java.io.*; | |
| 29 | |
| 30 public abstract class Platform { | |
| 31 /** file name templates capture naming conventions */ | |
| 32 protected FileName dummyFileTemplate = | |
| 33 new FileName(this, "", "", "", "", "", ""); | |
| 34 | |
| 35 // The next three must be instantiated in subclasses' constructors | |
| 36 | |
| 37 /** An incl file is produced per .c file and contains all the | |
| 38 includes it needs */ | |
| 39 protected FileName inclFileTemplate; | |
| 40 | |
| 41 /** A GI (grand-include) file has any file used more than N times | |
| 42 for precompiled headers */ | |
| 43 protected FileName giFileTemplate; | |
| 44 | |
| 45 /** A GD (grand-dependencies) file that tells Unix make all the | |
| 46 .o's needed for linking and the include dependencies */ | |
| 47 protected FileName gdFileTemplate; | |
| 48 | |
| 49 // Accessors | |
| 50 public FileName getInclFileTemplate() { | |
| 51 return inclFileTemplate; | |
| 52 } | |
| 53 | |
| 54 public FileName getGIFileTemplate() { | |
| 55 return giFileTemplate; | |
| 56 } | |
| 57 | |
| 58 public FileName getGDFileTemplate() { | |
| 59 return gdFileTemplate; | |
| 60 } | |
| 61 | |
| 62 // an incl file is the file included by each.c file that includes | |
| 63 // all needed header files | |
| 64 | |
| 65 public abstract void setupFileTemplates(); | |
| 66 public abstract String[] outerSuffixes(); | |
| 67 | |
| 68 /** empty file name -> no grand include file */ | |
| 69 public boolean haveGrandInclude() { | |
| 70 return (giFileTemplate.nameOfList().length() > 0); | |
| 71 } | |
| 72 | |
| 73 public boolean writeDeps() { | |
| 74 return (gdFileTemplate.nameOfList().length() > 0); | |
| 75 } | |
| 76 | |
| 77 /** <p> A gi file is the grand-include file. It includes in one | |
| 78 file any file that is included more than a certain number of | |
| 79 times. </p> | |
| 80 | |
| 81 <p> It is used for precompiled header files. </p> | |
| 82 | |
| 83 <p> It has a source name, that is the file that this program | |
| 84 generates, and a compiled name; that is the file that is | |
| 85 included by other files. </p> | |
| 86 | |
| 87 <p> Some platforms have this program actually explictly | |
| 88 include the preprocessed gi file-- see includeGIInEachIncl(). | |
| 89 </p> | |
| 90 | |
| 91 <p> Also, some platforms need a pragma in the GI file. </p> */ | |
| 92 public boolean includeGIInEachIncl() { | |
| 93 return false; | |
| 94 } | |
| 95 | |
| 96 /** For some platforms, e.g. Solaris, include the grand-include | |
| 97 dependencies in the makefile. For others, e.g. Windows, do | |
| 98 not. */ | |
| 99 public boolean includeGIDependencies() { | |
| 100 return false; | |
| 101 } | |
| 102 | |
| 103 /** Should C/C++ source file be dependent on a file included | |
| 104 into the grand-include file. */ | |
| 105 public boolean writeDependenciesOnHFilesFromGI() { | |
| 106 return false; | |
| 107 } | |
| 108 | |
| 109 /** Default implementation does nothing */ | |
| 110 public void writeGIPragma(PrintWriter out) { | |
| 111 } | |
| 112 | |
| 113 /** A line with a filename and the noGrandInclude string means | |
| 114 that this file cannot use the precompiled header. */ | |
| 115 public String noGrandInclude() { | |
| 116 return "no_precompiled_headers"; | |
| 117 } | |
| 118 | |
| 119 /** A line with a filename and the | |
| 120 generatePlatformDependentInclude means that an include file | |
| 121 for the header file must be generated. This file generated include | |
| 122 file is directly included by the non-platform dependent include file | |
| 123 (e.g os.hpp includes _os_pd.hpp.incl. So while we notice files that | |
| 124 are directly dependent on non-platform dependent files from the database | |
| 125 we must infer the dependence on platform specific files to generate correct | |
| 126 dependences on the platform specific files. */ | |
| 127 public String generatePlatformDependentInclude() { | |
| 128 return "generate_platform_dependent_include"; | |
| 129 } | |
| 130 | |
| 131 /** Prefix and suffix strings for emitting Makefile rules */ | |
| 132 public abstract String objFileSuffix(); | |
| 133 public abstract String asmFileSuffix(); | |
| 134 public abstract String dependentPrefix(); | |
| 135 | |
| 136 // Exit routines: | |
| 137 | |
| 138 /** Abort means an internal error */ | |
| 139 public void abort() { | |
| 140 throw new RuntimeException("Internal error"); | |
| 141 } | |
| 142 | |
| 143 /** fatalError is used by clients to stop the system */ | |
| 144 public void fatalError(String msg) { | |
| 145 System.err.println(msg); | |
| 146 System.exit(1); | |
| 147 } | |
| 148 | |
| 149 /** Default implementation performs case-sensitive comparison */ | |
| 150 public boolean fileNameStringEquality(String s1, String s2) { | |
| 151 return s1.equals(s2); | |
| 152 } | |
| 153 | |
| 154 public void fileNamePortabilityCheck(String name) { | |
| 155 if (Character.isUpperCase(name.charAt(0))) { | |
| 156 fatalError("Error: for the sake of portability we have chosen\n" + | |
| 157 "to avoid files starting with an uppercase letter.\n" + | |
| 158 "Please rename " + name + "."); | |
| 159 } | |
| 160 } | |
| 161 | |
| 162 public void fileNamePortabilityCheck(String name, String matchingName) { | |
| 163 if (!name.equals(matchingName)) { | |
| 164 fatalError("Error: file " + name + " also appears as " + | |
| 165 matchingName + ". Case must be consistent for " + | |
| 166 "portability."); | |
| 167 } | |
| 168 } | |
| 169 | |
| 170 /** max is 31 on mac, so warn */ | |
| 171 public int fileNameLengthLimit() { | |
| 172 return 45; | |
| 173 } | |
| 174 | |
| 175 public int defaultGrandIncludeThreshold() { | |
| 176 return 30; | |
| 177 } | |
| 178 | |
| 179 /** Not very general, but this is a way to get platform-specific | |
| 180 files to be written. Default implementation does nothing. */ | |
| 181 public void writePlatformSpecificFiles(Database previousDB, | |
| 182 Database currentDB, String[] args) | |
| 183 throws IllegalArgumentException, IOException { | |
| 184 } | |
| 185 } |