hotspot/src/share/vm/classfile/stringTable.hpp
author gziemski
Wed, 07 May 2014 14:16:45 -0500
changeset 24426 0a69c8cdfca9
child 26421 37d88e604ad0
permissions -rw-r--r--
8038654: Separate SymbolTable and StringTable code Summary: Refactor stringTable class out of symbolTable, making sure all includes are minimal set and are sorted. Reviewed-by: coleenp, stefank
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/*
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 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_CLASSFILE_STRINGTABLE_HPP
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#define SHARE_VM_CLASSFILE_STRINGTABLE_HPP
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#include "memory/allocation.inline.hpp"
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#include "utilities/hashtable.hpp"
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class StringTable : public Hashtable<oop, mtSymbol> {
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  friend class VMStructs;
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  friend class Symbol;
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private:
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  // The string table
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  static StringTable* _the_table;
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  // Set if one bucket is out of balance due to hash algorithm deficiency
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  static bool _needs_rehashing;
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  // Claimed high water mark for parallel chunked scanning
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  static volatile int _parallel_claimed_idx;
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  static oop intern(Handle string_or_null, jchar* chars, int length, TRAPS);
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  oop basic_add(int index, Handle string_or_null, jchar* name, int len,
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                unsigned int hashValue, TRAPS);
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  oop lookup(int index, jchar* chars, int length, unsigned int hashValue);
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  // Apply the give oop closure to the entries to the buckets
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  // in the range [start_idx, end_idx).
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  static void buckets_oops_do(OopClosure* f, int start_idx, int end_idx);
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  // Unlink or apply the give oop closure to the entries to the buckets
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  // in the range [start_idx, end_idx).
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  static void buckets_unlink_or_oops_do(BoolObjectClosure* is_alive, OopClosure* f, int start_idx, int end_idx, int* processed, int* removed);
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  StringTable() : Hashtable<oop, mtSymbol>((int)StringTableSize,
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                              sizeof (HashtableEntry<oop, mtSymbol>)) {}
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  StringTable(HashtableBucket<mtSymbol>* t, int number_of_entries)
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    : Hashtable<oop, mtSymbol>((int)StringTableSize, sizeof (HashtableEntry<oop, mtSymbol>), t,
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                     number_of_entries) {}
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public:
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  // The string table
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  static StringTable* the_table() { return _the_table; }
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  // Size of one bucket in the string table.  Used when checking for rollover.
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  static uint bucket_size() { return sizeof(HashtableBucket<mtSymbol>); }
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  static void create_table() {
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    assert(_the_table == NULL, "One string table allowed.");
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    _the_table = new StringTable();
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  }
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  // GC support
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  //   Delete pointers to otherwise-unreachable objects.
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  static void unlink_or_oops_do(BoolObjectClosure* cl, OopClosure* f) {
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    int processed = 0;
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    int removed = 0;
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    unlink_or_oops_do(cl, f, &processed, &removed);
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  }
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  static void unlink(BoolObjectClosure* cl) {
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    int processed = 0;
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    int removed = 0;
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    unlink_or_oops_do(cl, NULL, &processed, &removed);
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  }
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  static void unlink_or_oops_do(BoolObjectClosure* cl, OopClosure* f, int* processed, int* removed);
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  static void unlink(BoolObjectClosure* cl, int* processed, int* removed) {
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    unlink_or_oops_do(cl, NULL, processed, removed);
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  }
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  // Serially invoke "f->do_oop" on the locations of all oops in the table.
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  static void oops_do(OopClosure* f);
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  // Possibly parallel versions of the above
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  static void possibly_parallel_unlink_or_oops_do(BoolObjectClosure* cl, OopClosure* f, int* processed, int* removed);
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  static void possibly_parallel_unlink(BoolObjectClosure* cl, int* processed, int* removed) {
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    possibly_parallel_unlink_or_oops_do(cl, NULL, processed, removed);
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  }
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  static void possibly_parallel_oops_do(OopClosure* f);
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  // Hashing algorithm, used as the hash value used by the
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  //     StringTable for bucket selection and comparison (stored in the
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  //     HashtableEntry structures).  This is used in the String.intern() method.
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  static unsigned int hash_string(const jchar* s, int len);
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  // Internal test.
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  static void test_alt_hash() PRODUCT_RETURN;
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  // Probing
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  static oop lookup(Symbol* symbol);
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  static oop lookup(jchar* chars, int length);
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  // Interning
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  static oop intern(Symbol* symbol, TRAPS);
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  static oop intern(oop string, TRAPS);
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  static oop intern(const char *utf8_string, TRAPS);
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  // Debugging
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  static void verify();
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  static void dump(outputStream* st);
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  enum VerifyMesgModes {
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    _verify_quietly    = 0,
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    _verify_with_mesgs = 1
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  };
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  enum VerifyRetTypes {
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    _verify_pass          = 0,
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    _verify_fail_continue = 1,
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    _verify_fail_done     = 2
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  };
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  static VerifyRetTypes compare_entries(int bkt1, int e_cnt1,
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                                        HashtableEntry<oop, mtSymbol>* e_ptr1,
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                                        int bkt2, int e_cnt2,
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                                        HashtableEntry<oop, mtSymbol>* e_ptr2);
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  static VerifyRetTypes verify_entry(int bkt, int e_cnt,
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                                     HashtableEntry<oop, mtSymbol>* e_ptr,
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                                     VerifyMesgModes mesg_mode);
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  static int verify_and_compare_entries();
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  // Sharing
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  static void copy_buckets(char** top, char*end) {
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    the_table()->Hashtable<oop, mtSymbol>::copy_buckets(top, end);
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  }
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  static void copy_table(char** top, char*end) {
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    the_table()->Hashtable<oop, mtSymbol>::copy_table(top, end);
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  }
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  static void reverse() {
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    the_table()->Hashtable<oop, mtSymbol>::reverse();
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  }
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  // Rehash the symbol table if it gets out of balance
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  static void rehash_table();
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  static bool needs_rehashing() { return _needs_rehashing; }
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  // Parallel chunked scanning
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  static void clear_parallel_claimed_index() { _parallel_claimed_idx = 0; }
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  static int parallel_claimed_index() { return _parallel_claimed_idx; }
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};
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#endif // SHARE_VM_CLASSFILE_STRINGTABLE_HPP