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src/hotspot/share/classfile/classListParser.hpp

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   1 /*
   2  * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
   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  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_MEMORY_CLASSLISTPARSER_HPP
  26 #define SHARE_VM_MEMORY_CLASSLISTPARSER_HPP
  27 
  28 #include "utilities/exceptions.hpp"
  29 #include "utilities/globalDefinitions.hpp"

  30 #include "utilities/hashtable.hpp"
  31 
  32 class CDSClassInfo;
  33 
  34 // Look up from ID -> InstanceKlass*
  35 class ID2KlassTable : public Hashtable<InstanceKlass*, mtClass> {
  36 public:
  37   ID2KlassTable() : Hashtable<InstanceKlass*, mtClass>(1987, sizeof(HashtableEntry<InstanceKlass*, mtClass>)) { }
  38   void add(int id, InstanceKlass* klass) {
  39     unsigned int hash = (unsigned int)id;
  40     HashtableEntry<InstanceKlass*, mtClass>* entry = new_entry(hash, klass);
  41     add_entry(hash_to_index(hash), entry);
  42   }
  43 
  44   InstanceKlass* lookup(int id) {
  45     unsigned int hash = (unsigned int)id;
  46     int index = hash_to_index(id);
  47     for (HashtableEntry<InstanceKlass*, mtClass>* e = bucket(index); e != NULL; e = e->next()) {
  48       if (e->hash() == hash) {
  49         return e->literal();
  50       }
  51     }
  52     return NULL;
  53   }
  54 };
  55 
  56 class ClassListParser : public StackObj {
  57   enum {
  58     _unspecified      = -999,
  59 
  60     // Max number of bytes allowed per line in the classlist.
  61     // Theoretically Java class names could be 65535 bytes in length. Also, an input line
  62     // could have a very long path name up to JVM_MAXPATHLEN bytes in length. In reality,
  63     // 4K bytes is more than enough.
  64     _max_allowed_line_len = 4096,
  65     _line_buf_extra       = 10, // for detecting input too long
  66     _line_buf_size        = _max_allowed_line_len + _line_buf_extra
  67   };
  68 
  69   static ClassListParser* _instance; // the singleton.
  70   const char* _classlist_file;
  71   FILE* _file;
  72 
  73   ID2KlassTable _id2klass_table;


   1 /*
   2  * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
   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  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_MEMORY_CLASSLISTPARSER_HPP
  26 #define SHARE_VM_MEMORY_CLASSLISTPARSER_HPP
  27 
  28 #include "utilities/exceptions.hpp"
  29 #include "utilities/globalDefinitions.hpp"
  30 #include "utilities/growableArray.hpp"
  31 #include "utilities/hashtable.hpp"
  32 
  33 class ID2KlassTable : public KVHashtable<int, InstanceKlass*> {



  34 public:
  35   ID2KlassTable() : KVHashtable<int, InstanceKlass*>(1987) {}
















  36 };
  37 
  38 class ClassListParser : public StackObj {
  39   enum {
  40     _unspecified      = -999,
  41 
  42     // Max number of bytes allowed per line in the classlist.
  43     // Theoretically Java class names could be 65535 bytes in length. Also, an input line
  44     // could have a very long path name up to JVM_MAXPATHLEN bytes in length. In reality,
  45     // 4K bytes is more than enough.
  46     _max_allowed_line_len = 4096,
  47     _line_buf_extra       = 10, // for detecting input too long
  48     _line_buf_size        = _max_allowed_line_len + _line_buf_extra
  49   };
  50 
  51   static ClassListParser* _instance; // the singleton.
  52   const char* _classlist_file;
  53   FILE* _file;
  54 
  55   ID2KlassTable _id2klass_table;


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