graal-compiler: src/share/vm/classfile/symbolTable.hpp annotate

annotate src/share/vm/classfile/symbolTable.hpp @ 6162:e9140bf80b4a

7158800: Improve storage of symbol tables Summary: Use an alternate version of hashing algorithm for symbol string tables and after a certain bucket size to improve performance Reviewed-by: pbk, kamg, dlong, kvn, fparain

author	coleenp
date	Wed, 13 Jun 2012 19:52:59 -0400
parents	fc9d8850ab8b
children	246d977b51f2

rev	line source
0 a61af66fc99e Initial load duke parents: diff changeset	1 /*
5979 fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
0 a61af66fc99e Initial load duke parents: diff changeset	3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
a61af66fc99e Initial load duke parents: diff changeset	4 *
a61af66fc99e Initial load duke parents: diff changeset	5 * This code is free software; you can redistribute it and/or modify it
a61af66fc99e Initial load duke parents: diff changeset	6 * under the terms of the GNU General Public License version 2 only, as
a61af66fc99e Initial load duke parents: diff changeset	7 * published by the Free Software Foundation.
a61af66fc99e Initial load duke parents: diff changeset	8 *
a61af66fc99e Initial load duke parents: diff changeset	9 * This code is distributed in the hope that it will be useful, but WITHOUT
a61af66fc99e Initial load duke parents: diff changeset	10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
a61af66fc99e Initial load duke parents: diff changeset	11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
a61af66fc99e Initial load duke parents: diff changeset	12 * version 2 for more details (a copy is included in the LICENSE file that
a61af66fc99e Initial load duke parents: diff changeset	13 * accompanied this code).
a61af66fc99e Initial load duke parents: diff changeset	14 *
a61af66fc99e Initial load duke parents: diff changeset	15 * You should have received a copy of the GNU General Public License version
a61af66fc99e Initial load duke parents: diff changeset	16 * 2 along with this work; if not, write to the Free Software Foundation,
a61af66fc99e Initial load duke parents: diff changeset	17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
a61af66fc99e Initial load duke parents: diff changeset	18 *
1552 c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 665 diff changeset	19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 665 diff changeset	20 * or visit www.oracle.com if you need additional information or have any
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 665 diff changeset	21 * questions.
0 a61af66fc99e Initial load duke parents: diff changeset	22 *
a61af66fc99e Initial load duke parents: diff changeset	23 */
a61af66fc99e Initial load duke parents: diff changeset	24
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	25 #ifndef SHARE_VM_CLASSFILE_SYMBOLTABLE_HPP
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	26 #define SHARE_VM_CLASSFILE_SYMBOLTABLE_HPP
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	27
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	28 #include "memory/allocation.inline.hpp"
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	29 #include "oops/symbol.hpp"
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	30 #include "utilities/hashtable.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	31
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	32 // The symbol table holds all Symbol*s and corresponding interned strings.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	33 // Symbol*s and literal strings should be canonicalized.
0 a61af66fc99e Initial load duke parents: diff changeset	34 //
a61af66fc99e Initial load duke parents: diff changeset	35 // The interned strings are created lazily.
a61af66fc99e Initial load duke parents: diff changeset	36 //
a61af66fc99e Initial load duke parents: diff changeset	37 // It is implemented as an open hash table with a fixed number of buckets.
a61af66fc99e Initial load duke parents: diff changeset	38 //
a61af66fc99e Initial load duke parents: diff changeset	39 // %note:
a61af66fc99e Initial load duke parents: diff changeset	40 // - symbolTableEntrys are allocated in blocks to reduce the space overhead.
a61af66fc99e Initial load duke parents: diff changeset	41
a61af66fc99e Initial load duke parents: diff changeset	42 class BoolObjectClosure;
6162 e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	43 class outputStream;
0 a61af66fc99e Initial load duke parents: diff changeset	44
a61af66fc99e Initial load duke parents: diff changeset	45
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	46 // Class to hold a newly created or referenced Symbol* temporarily in scope.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	47 // new_symbol() and lookup() will create a Symbol* if not already in the
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	48 // symbol table and add to the symbol's reference count.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	49 // probe() and lookup_only() will increment the refcount if symbol is found.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	50 class TempNewSymbol : public StackObj {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	51 Symbol* _temp;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	52
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	53 public:
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	54 TempNewSymbol() : _temp(NULL) {}
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	55 // Creating or looking up a symbol increments the symbol's reference count
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	56 TempNewSymbol(Symbol *s) : _temp(s) {}
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	57
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	58 // Operator= increments reference count.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	59 void operator=(const TempNewSymbol &s) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	60 _temp = s._temp;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	61 if (_temp !=NULL) _temp->increment_refcount();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	62 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	63
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	64 // Decrement reference counter so it can go away if it's unique
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	65 ~TempNewSymbol() { if (_temp != NULL) _temp->decrement_refcount(); }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	66
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	67 // Operators so they can be used like Symbols
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	68 Symbol* operator -> () const { return _temp; }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	69 bool operator == (Symbol* o) const { return _temp == o; }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	70 // Sneaky conversion function
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	71 operator Symbol*() { return _temp; }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	72 };
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	73
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	74 class SymbolTable : public Hashtable<Symbol*> {
0 a61af66fc99e Initial load duke parents: diff changeset	75 friend class VMStructs;
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	76 friend class ClassFileParser;
0 a61af66fc99e Initial load duke parents: diff changeset	77
a61af66fc99e Initial load duke parents: diff changeset	78 private:
a61af66fc99e Initial load duke parents: diff changeset	79 // The symbol table
a61af66fc99e Initial load duke parents: diff changeset	80 static SymbolTable* _the_table;
a61af66fc99e Initial load duke parents: diff changeset	81
6162 e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	82 // Set if one bucket is out of balance due to hash algorithm deficiency
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	83 static bool _needs_rehashing;
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	84 static jint _seed;
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	85
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	86 // For statistics
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	87 static int symbols_removed;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	88 static int symbols_counted;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	89
5979 fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	90 Symbol* allocate_symbol(const u1* name, int len, bool c_heap, TRAPS); // Assumes no characters larger than 0x7F
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	91
0 a61af66fc99e Initial load duke parents: diff changeset	92 // Adding elements
5979 fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	93 Symbol* basic_add(int index, u1* name, int len, unsigned int hashValue,
fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	94 bool c_heap, TRAPS);
fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	95
fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	96 bool basic_add(Handle class_loader, constantPoolHandle cp, int names_count,
0 a61af66fc99e Initial load duke parents: diff changeset	97 const char** names, int* lengths, int* cp_indices,
a61af66fc99e Initial load duke parents: diff changeset	98 unsigned int* hashValues, TRAPS);
a61af66fc99e Initial load duke parents: diff changeset	99
5979 fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	100 static void new_symbols(Handle class_loader, constantPoolHandle cp,
fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	101 int names_count,
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	102 const char** name, int* lengths,
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	103 int* cp_indices, unsigned int* hashValues,
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	104 TRAPS) {
5979 fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	105 add(class_loader, cp, names_count, name, lengths, cp_indices, hashValues, THREAD);
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	106 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	107
0 a61af66fc99e Initial load duke parents: diff changeset	108 // Table size
a61af66fc99e Initial load duke parents: diff changeset	109 enum {
a61af66fc99e Initial load duke parents: diff changeset	110 symbol_table_size = 20011
a61af66fc99e Initial load duke parents: diff changeset	111 };
a61af66fc99e Initial load duke parents: diff changeset	112
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	113 Symbol* lookup(int index, const char* name, int len, unsigned int hash);
0 a61af66fc99e Initial load duke parents: diff changeset	114
a61af66fc99e Initial load duke parents: diff changeset	115 SymbolTable()
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	116 : Hashtable<Symbol>(symbol_table_size, sizeof (HashtableEntry<Symbol>)) {}
0 a61af66fc99e Initial load duke parents: diff changeset	117
a61af66fc99e Initial load duke parents: diff changeset	118 SymbolTable(HashtableBucket* t, int number_of_entries)
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	119 : Hashtable<Symbol>(symbol_table_size, sizeof (HashtableEntry<Symbol>), t,
0 a61af66fc99e Initial load duke parents: diff changeset	120 number_of_entries) {}
a61af66fc99e Initial load duke parents: diff changeset	121
5979 fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	122 // Arena for permanent symbols (null class loader) that are never unloaded
fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	123 static Arena* _arena;
fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	124 static Arena* arena() { return _arena; } // called for statistics
0 a61af66fc99e Initial load duke parents: diff changeset	125
5979 fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	126 static void initialize_symbols(int arena_alloc_size = 0);
6162 e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	127
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	128 static bool use_alternate_hashcode() { return _seed != 0; }
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	129 static jint seed() { return _seed; }
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	130
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	131 unsigned int new_hash(Symbol* sym);
0 a61af66fc99e Initial load duke parents: diff changeset	132 public:
a61af66fc99e Initial load duke parents: diff changeset	133 enum {
5979 fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	134 symbol_alloc_batch_size = 8,
fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	135 // Pick initial size based on java -version size measurements
fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	136 symbol_alloc_arena_size = 360*K
0 a61af66fc99e Initial load duke parents: diff changeset	137 };
a61af66fc99e Initial load duke parents: diff changeset	138
a61af66fc99e Initial load duke parents: diff changeset	139 // The symbol table
a61af66fc99e Initial load duke parents: diff changeset	140 static SymbolTable* the_table() { return _the_table; }
a61af66fc99e Initial load duke parents: diff changeset	141
a61af66fc99e Initial load duke parents: diff changeset	142 static void create_table() {
a61af66fc99e Initial load duke parents: diff changeset	143 assert(_the_table == NULL, "One symbol table allowed.");
a61af66fc99e Initial load duke parents: diff changeset	144 _the_table = new SymbolTable();
5979 fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	145 initialize_symbols(symbol_alloc_arena_size);
0 a61af66fc99e Initial load duke parents: diff changeset	146 }
a61af66fc99e Initial load duke parents: diff changeset	147
a61af66fc99e Initial load duke parents: diff changeset	148 static void create_table(HashtableBucket* t, int length,
a61af66fc99e Initial load duke parents: diff changeset	149 int number_of_entries) {
a61af66fc99e Initial load duke parents: diff changeset	150 assert(_the_table == NULL, "One symbol table allowed.");
a61af66fc99e Initial load duke parents: diff changeset	151 assert(length == symbol_table_size * sizeof(HashtableBucket),
a61af66fc99e Initial load duke parents: diff changeset	152 "bad shared symbol size.");
a61af66fc99e Initial load duke parents: diff changeset	153 _the_table = new SymbolTable(t, number_of_entries);
5979 fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	154 // if CDS give symbol table a default arena size since most symbols
fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	155 // are already allocated in the shared misc section.
fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	156 initialize_symbols();
0 a61af66fc99e Initial load duke parents: diff changeset	157 }
a61af66fc99e Initial load duke parents: diff changeset	158
6162 e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	159 static unsigned int hash_symbol(const char* s, int len, unsigned int hashValue = 0);
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	160
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	161 static Symbol* lookup(const char* name, int len, TRAPS);
0 a61af66fc99e Initial load duke parents: diff changeset	162 // lookup only, won't add. Also calculate hash.
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	163 static Symbol* lookup_only(const char* name, int len, unsigned int& hash);
0 a61af66fc99e Initial load duke parents: diff changeset	164 // Only copy to C string to be added if lookup failed.
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	165 static Symbol* lookup(const Symbol* sym, int begin, int end, TRAPS);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	166
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	167 static void release(Symbol* sym);
0 a61af66fc99e Initial load duke parents: diff changeset	168
4800 94ec88ca68e2 7115199: Add event tracing hooks and Java Flight Recorder infrastructure phh parents: 2418 diff changeset	169 // Look up the address of the literal in the SymbolTable for this Symbol*
94ec88ca68e2 7115199: Add event tracing hooks and Java Flight Recorder infrastructure phh parents: 2418 diff changeset	170 static Symbol** lookup_symbol_addr(Symbol* sym);
94ec88ca68e2 7115199: Add event tracing hooks and Java Flight Recorder infrastructure phh parents: 2418 diff changeset	171
665 c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 0 diff changeset	172 // jchar (utf16) version of lookups
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	173 static Symbol* lookup_unicode(const jchar* name, int len, TRAPS);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	174 static Symbol* lookup_only_unicode(const jchar* name, int len, unsigned int& hash);
665 c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 0 diff changeset	175
5979 fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	176 static void add(Handle class_loader, constantPoolHandle cp, int names_count,
0 a61af66fc99e Initial load duke parents: diff changeset	177 const char** names, int* lengths, int* cp_indices,
a61af66fc99e Initial load duke parents: diff changeset	178 unsigned int* hashValues, TRAPS);
a61af66fc99e Initial load duke parents: diff changeset	179
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	180 // Release any dead symbols
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	181 static void unlink();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	182
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	183 // iterate over symbols
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	184 static void symbols_do(SymbolClosure *cl);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	185
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	186 // Symbol creation
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	187 static Symbol* new_symbol(const char* utf8_buffer, int length, TRAPS) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	188 assert(utf8_buffer != NULL, "just checking");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	189 return lookup(utf8_buffer, length, THREAD);
0 a61af66fc99e Initial load duke parents: diff changeset	190 }
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	191 static Symbol* new_symbol(const char* name, TRAPS) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	192 return new_symbol(name, (int)strlen(name), THREAD);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	193 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	194 static Symbol* new_symbol(const Symbol* sym, int begin, int end, TRAPS) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	195 assert(begin <= end && end <= sym->utf8_length(), "just checking");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	196 return lookup(sym, begin, end, THREAD);
0 a61af66fc99e Initial load duke parents: diff changeset	197 }
a61af66fc99e Initial load duke parents: diff changeset	198
5979 fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	199 // Create a symbol in the arena for symbols that are not deleted
fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	200 static Symbol* new_permanent_symbol(const char* name, TRAPS);
fc9d8850ab8b 7150058: Allocate symbols from null boot loader to an arena for NMT coleenp parents: 4800 diff changeset	201
0 a61af66fc99e Initial load duke parents: diff changeset	202 // Symbol lookup
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	203 static Symbol* lookup(int index, const char* name, int len, TRAPS);
0 a61af66fc99e Initial load duke parents: diff changeset	204
a61af66fc99e Initial load duke parents: diff changeset	205 // Needed for preloading classes in signatures when compiling.
a61af66fc99e Initial load duke parents: diff changeset	206 // Returns the symbol is already present in symbol table, otherwise
a61af66fc99e Initial load duke parents: diff changeset	207 // NULL. NO ALLOCATION IS GUARANTEED!
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	208 static Symbol* probe(const char* name, int len) {
665 c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 0 diff changeset	209 unsigned int ignore_hash;
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 0 diff changeset	210 return lookup_only(name, len, ignore_hash);
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 0 diff changeset	211 }
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	212 static Symbol* probe_unicode(const jchar* name, int len) {
665 c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 0 diff changeset	213 unsigned int ignore_hash;
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 0 diff changeset	214 return lookup_only_unicode(name, len, ignore_hash);
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 0 diff changeset	215 }
0 a61af66fc99e Initial load duke parents: diff changeset	216
a61af66fc99e Initial load duke parents: diff changeset	217 // Histogram
a61af66fc99e Initial load duke parents: diff changeset	218 static void print_histogram() PRODUCT_RETURN;
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	219 static void print() PRODUCT_RETURN;
0 a61af66fc99e Initial load duke parents: diff changeset	220
a61af66fc99e Initial load duke parents: diff changeset	221 // Debugging
a61af66fc99e Initial load duke parents: diff changeset	222 static void verify();
6162 e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	223 static void dump(outputStream* st);
0 a61af66fc99e Initial load duke parents: diff changeset	224
a61af66fc99e Initial load duke parents: diff changeset	225 // Sharing
a61af66fc99e Initial load duke parents: diff changeset	226 static void copy_buckets(char** top, char*end) {
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	227 the_table()->Hashtable<Symbol*>::copy_buckets(top, end);
0 a61af66fc99e Initial load duke parents: diff changeset	228 }
a61af66fc99e Initial load duke parents: diff changeset	229 static void copy_table(char** top, char*end) {
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	230 the_table()->Hashtable<Symbol*>::copy_table(top, end);
0 a61af66fc99e Initial load duke parents: diff changeset	231 }
a61af66fc99e Initial load duke parents: diff changeset	232 static void reverse(void* boundary = NULL) {
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	233 the_table()->Hashtable<Symbol*>::reverse(boundary);
0 a61af66fc99e Initial load duke parents: diff changeset	234 }
6162 e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	235
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	236 // Rehash the symbol table if it gets out of balance
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	237 static void rehash_table();
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	238 static bool needs_rehashing() { return _needs_rehashing; }
0 a61af66fc99e Initial load duke parents: diff changeset	239 };
a61af66fc99e Initial load duke parents: diff changeset	240
6162 e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	241
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	242 class StringTable : public Hashtable<oop> {
0 a61af66fc99e Initial load duke parents: diff changeset	243 friend class VMStructs;
a61af66fc99e Initial load duke parents: diff changeset	244
a61af66fc99e Initial load duke parents: diff changeset	245 private:
a61af66fc99e Initial load duke parents: diff changeset	246 // The string table
a61af66fc99e Initial load duke parents: diff changeset	247 static StringTable* _the_table;
a61af66fc99e Initial load duke parents: diff changeset	248
6162 e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	249 // Set if one bucket is out of balance due to hash algorithm deficiency
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	250 static bool _needs_rehashing;
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	251 static jint _seed;
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	252
0 a61af66fc99e Initial load duke parents: diff changeset	253 static oop intern(Handle string_or_null, jchar* chars, int length, TRAPS);
a61af66fc99e Initial load duke parents: diff changeset	254 oop basic_add(int index, Handle string_or_null, jchar* name, int len,
a61af66fc99e Initial load duke parents: diff changeset	255 unsigned int hashValue, TRAPS);
a61af66fc99e Initial load duke parents: diff changeset	256
a61af66fc99e Initial load duke parents: diff changeset	257 oop lookup(int index, jchar* chars, int length, unsigned int hashValue);
a61af66fc99e Initial load duke parents: diff changeset	258
2378 924777755fad 6962930: make the string table size configurable jcoomes parents: 2177 diff changeset	259 StringTable() : Hashtable<oop>((int)StringTableSize,
924777755fad 6962930: make the string table size configurable jcoomes parents: 2177 diff changeset	260 sizeof (HashtableEntry<oop>)) {}
0 a61af66fc99e Initial load duke parents: diff changeset	261
a61af66fc99e Initial load duke parents: diff changeset	262 StringTable(HashtableBucket* t, int number_of_entries)
2378 924777755fad 6962930: make the string table size configurable jcoomes parents: 2177 diff changeset	263 : Hashtable<oop>((int)StringTableSize, sizeof (HashtableEntry<oop>), t,
924777755fad 6962930: make the string table size configurable jcoomes parents: 2177 diff changeset	264 number_of_entries) {}
0 a61af66fc99e Initial load duke parents: diff changeset	265
6162 e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	266 static bool use_alternate_hashcode() { return _seed != 0; }
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	267 static jint seed() { return _seed; }
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	268
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	269 unsigned int new_hash(oop s);
0 a61af66fc99e Initial load duke parents: diff changeset	270 public:
a61af66fc99e Initial load duke parents: diff changeset	271 // The string table
a61af66fc99e Initial load duke parents: diff changeset	272 static StringTable* the_table() { return _the_table; }
a61af66fc99e Initial load duke parents: diff changeset	273
a61af66fc99e Initial load duke parents: diff changeset	274 static void create_table() {
a61af66fc99e Initial load duke parents: diff changeset	275 assert(_the_table == NULL, "One string table allowed.");
a61af66fc99e Initial load duke parents: diff changeset	276 _the_table = new StringTable();
a61af66fc99e Initial load duke parents: diff changeset	277 }
a61af66fc99e Initial load duke parents: diff changeset	278
a61af66fc99e Initial load duke parents: diff changeset	279 static void create_table(HashtableBucket* t, int length,
a61af66fc99e Initial load duke parents: diff changeset	280 int number_of_entries) {
a61af66fc99e Initial load duke parents: diff changeset	281 assert(_the_table == NULL, "One string table allowed.");
2378 924777755fad 6962930: make the string table size configurable jcoomes parents: 2177 diff changeset	282 assert((size_t)length == StringTableSize * sizeof(HashtableBucket),
0 a61af66fc99e Initial load duke parents: diff changeset	283 "bad shared string size.");
a61af66fc99e Initial load duke parents: diff changeset	284 _the_table = new StringTable(t, number_of_entries);
a61af66fc99e Initial load duke parents: diff changeset	285 }
a61af66fc99e Initial load duke parents: diff changeset	286
a61af66fc99e Initial load duke parents: diff changeset	287 // GC support
a61af66fc99e Initial load duke parents: diff changeset	288 // Delete pointers to otherwise-unreachable objects.
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	289 static void unlink(BoolObjectClosure* cl);
0 a61af66fc99e Initial load duke parents: diff changeset	290
a61af66fc99e Initial load duke parents: diff changeset	291 // Invoke "f->do_oop" on the locations of all oops in the table.
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	292 static void oops_do(OopClosure* f);
0 a61af66fc99e Initial load duke parents: diff changeset	293
6162 e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	294 // Hashing algorithm, used as the hash value used by the
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	295 // StringTable for bucket selection and comparison (stored in the
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	296 // HashtableEntry structures). This is used in the String.intern() method.
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	297 static unsigned int hash_string(const jchar* s, int len, unsigned int hashValue = 0);
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	298
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	299 // Internal test.
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	300 static void test_alt_hash() PRODUCT_RETURN;
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	301
0 a61af66fc99e Initial load duke parents: diff changeset	302 // Probing
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	303 static oop lookup(Symbol* symbol);
0 a61af66fc99e Initial load duke parents: diff changeset	304
a61af66fc99e Initial load duke parents: diff changeset	305 // Interning
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	306 static oop intern(Symbol* symbol, TRAPS);
0 a61af66fc99e Initial load duke parents: diff changeset	307 static oop intern(oop string, TRAPS);
a61af66fc99e Initial load duke parents: diff changeset	308 static oop intern(const char *utf8_string, TRAPS);
a61af66fc99e Initial load duke parents: diff changeset	309
a61af66fc99e Initial load duke parents: diff changeset	310 // Debugging
a61af66fc99e Initial load duke parents: diff changeset	311 static void verify();
6162 e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	312 static void dump(outputStream* st);
0 a61af66fc99e Initial load duke parents: diff changeset	313
a61af66fc99e Initial load duke parents: diff changeset	314 // Sharing
a61af66fc99e Initial load duke parents: diff changeset	315 static void copy_buckets(char** top, char*end) {
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	316 the_table()->Hashtable<oop>::copy_buckets(top, end);
0 a61af66fc99e Initial load duke parents: diff changeset	317 }
a61af66fc99e Initial load duke parents: diff changeset	318 static void copy_table(char** top, char*end) {
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	319 the_table()->Hashtable<oop>::copy_table(top, end);
0 a61af66fc99e Initial load duke parents: diff changeset	320 }
a61af66fc99e Initial load duke parents: diff changeset	321 static void reverse() {
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	322 the_table()->Hashtable<oop>::reverse();
0 a61af66fc99e Initial load duke parents: diff changeset	323 }
6162 e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	324
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	325 // Rehash the symbol table if it gets out of balance
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	326 static void rehash_table();
e9140bf80b4a 7158800: Improve storage of symbol tables coleenp parents: 5979 diff changeset	327 static bool needs_rehashing() { return _needs_rehashing; }
0 a61af66fc99e Initial load duke parents: diff changeset	328 };
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	329 #endif // SHARE_VM_CLASSFILE_SYMBOLTABLE_HPP

Mercurial > hg > graal-compiler

annotate src/share/vm/classfile/symbolTable.hpp @ 6162:e9140bf80b4a