truffle: src/share/vm/classfile/symbolTable.cpp annotate

annotate src/share/vm/classfile/symbolTable.cpp @ 2244:4f26f535a225

6354181: nsk.logging.stress.threads.scmhml001 fails assertion in "src/share/vm/oops/instanceKlass.cpp, 111" Reviewed-by: jrose, acorn

author	never
date	Mon, 31 Jan 2011 17:48:21 -0800
parents	3582bf76420e
children	df1347358fe6

rev	line source
0 a61af66fc99e Initial load duke parents: diff changeset	1 /*
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	2 * Copyright (c) 1997, 2010, 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 #include "precompiled.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	26 #include "classfile/javaClasses.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	27 #include "classfile/symbolTable.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	28 #include "classfile/systemDictionary.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	29 #include "gc_interface/collectedHeap.inline.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	30 #include "memory/filemap.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	31 #include "memory/gcLocker.inline.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	32 #include "oops/oop.inline.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	33 #include "oops/oop.inline2.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	34 #include "runtime/mutexLocker.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	35 #include "utilities/hashtable.inline.hpp"
0 a61af66fc99e Initial load duke parents: diff changeset	36
a61af66fc99e Initial load duke parents: diff changeset	37 // --------------------------------------------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	38
a61af66fc99e Initial load duke parents: diff changeset	39 SymbolTable* SymbolTable::_the_table = NULL;
a61af66fc99e Initial load duke parents: diff changeset	40
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	41 Symbol* SymbolTable::allocate_symbol(const u1* name, int len, TRAPS) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	42 // Don't allow symbols to be created which cannot fit in a Symbol*.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	43 if (len > Symbol::max_length()) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	44 THROW_MSG_0(vmSymbols::java_lang_InternalError(),
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	45 "name is too long to represent");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	46 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	47 Symbol* sym = new (len) Symbol(name, len);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	48 assert(sym != NULL, "new should call vm_exit_out_of_memory if C_HEAP is exhausted");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	49 return sym;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	50 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	51
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	52 bool SymbolTable::allocate_symbols(int names_count, const u1** names,
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	53 int* lengths, Symbol** syms, TRAPS) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	54 for (int i = 0; i< names_count; i++) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	55 if (lengths[i] > Symbol::max_length()) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	56 THROW_MSG_0(vmSymbols::java_lang_InternalError(),
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	57 "name is too long to represent");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	58 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	59 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	60
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	61 for (int i = 0; i< names_count; i++) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	62 int len = lengths[i];
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	63 syms[i] = new (len) Symbol(names[i], len);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	64 assert(syms[i] != NULL, "new should call vm_exit_out_of_memory if "
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	65 "C_HEAP is exhausted");
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 return true;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	68 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	69
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	70 // Call function for all symbols in the symbol table.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	71 void SymbolTable::symbols_do(SymbolClosure *cl) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	72 const int n = the_table()->table_size();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	73 for (int i = 0; i < n; i++) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	74 for (HashtableEntry<Symbol> p = the_table()->bucket(i);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	75 p != NULL;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	76 p = p->next()) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	77 cl->do_symbol(p->literal_addr());
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	78 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	79 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	80 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	81
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	82 int SymbolTable::symbols_removed = 0;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	83 int SymbolTable::symbols_counted = 0;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	84
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	85 // Remove unreferenced symbols from the symbol table
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	86 // This is done late during GC. This doesn't use the hash table unlink because
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	87 // it assumes that the literals are oops.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	88 void SymbolTable::unlink() {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	89 int removed = 0;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	90 int total = 0;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	91 int memory_total = 0;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	92 for (int i = 0; i < the_table()->table_size(); ++i) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	93 for (HashtableEntry<Symbol>* p = the_table()->bucket_addr(i); *p != NULL; ) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	94 HashtableEntry<Symbol> entry = *p;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	95 if (entry->is_shared()) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	96 break;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	97 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	98 Symbol* s = entry->literal();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	99 memory_total += s->object_size();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	100 total++;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	101 assert(s != NULL, "just checking");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	102 // If reference count is zero, remove.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	103 if (s->refcount() == 0) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	104 delete s;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	105 removed++;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	106 *p = entry->next();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	107 the_table()->free_entry(entry);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	108 } else {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	109 p = entry->next_addr();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	110 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	111 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	112 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	113 symbols_removed += removed;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	114 symbols_counted += total;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	115 if (PrintGCDetails) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	116 gclog_or_tty->print(" [Symbols=%d size=%dK] ", total,
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	117 (memory_total*HeapWordSize)/1024);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	118 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	119 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	120
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	121
0 a61af66fc99e Initial load duke parents: diff changeset	122 // Lookup a symbol in a bucket.
a61af66fc99e Initial load duke parents: diff changeset	123
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	124 Symbol* SymbolTable::lookup(int index, const char* name,
0 a61af66fc99e Initial load duke parents: diff changeset	125 int len, unsigned int hash) {
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	126 for (HashtableEntry<Symbol> e = bucket(index); e != NULL; e = e->next()) {
0 a61af66fc99e Initial load duke parents: diff changeset	127 if (e->hash() == hash) {
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	128 Symbol* sym = e->literal();
0 a61af66fc99e Initial load duke parents: diff changeset	129 if (sym->equals(name, len)) {
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	130 // something is referencing this symbol now.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	131 sym->increment_refcount();
0 a61af66fc99e Initial load duke parents: diff changeset	132 return sym;
a61af66fc99e Initial load duke parents: diff changeset	133 }
a61af66fc99e Initial load duke parents: diff changeset	134 }
a61af66fc99e Initial load duke parents: diff changeset	135 }
a61af66fc99e Initial load duke parents: diff changeset	136 return NULL;
a61af66fc99e Initial load duke parents: diff changeset	137 }
a61af66fc99e Initial load duke parents: diff changeset	138
a61af66fc99e Initial load duke parents: diff changeset	139
a61af66fc99e Initial load duke parents: diff changeset	140 // We take care not to be blocking while holding the
a61af66fc99e Initial load duke parents: diff changeset	141 // SymbolTable_lock. Otherwise, the system might deadlock, since the
a61af66fc99e Initial load duke parents: diff changeset	142 // symboltable is used during compilation (VM_thread) The lock free
a61af66fc99e Initial load duke parents: diff changeset	143 // synchronization is simplified by the fact that we do not delete
a61af66fc99e Initial load duke parents: diff changeset	144 // entries in the symbol table during normal execution (only during
a61af66fc99e Initial load duke parents: diff changeset	145 // safepoints).
a61af66fc99e Initial load duke parents: diff changeset	146
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	147 Symbol* SymbolTable::lookup(const char* name, int len, TRAPS) {
0 a61af66fc99e Initial load duke parents: diff changeset	148 unsigned int hashValue = hash_symbol(name, len);
a61af66fc99e Initial load duke parents: diff changeset	149 int index = the_table()->hash_to_index(hashValue);
a61af66fc99e Initial load duke parents: diff changeset	150
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	151 Symbol* s = the_table()->lookup(index, name, len, hashValue);
0 a61af66fc99e Initial load duke parents: diff changeset	152
a61af66fc99e Initial load duke parents: diff changeset	153 // Found
a61af66fc99e Initial load duke parents: diff changeset	154 if (s != NULL) return s;
a61af66fc99e Initial load duke parents: diff changeset	155
a61af66fc99e Initial load duke parents: diff changeset	156 // Otherwise, add to symbol to table
a61af66fc99e Initial load duke parents: diff changeset	157 return the_table()->basic_add(index, (u1*)name, len, hashValue, CHECK_NULL);
a61af66fc99e Initial load duke parents: diff changeset	158 }
a61af66fc99e Initial load duke parents: diff changeset	159
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	160 Symbol* SymbolTable::lookup(const Symbol* sym, int begin, int end, TRAPS) {
0 a61af66fc99e Initial load duke parents: diff changeset	161 char* buffer;
a61af66fc99e Initial load duke parents: diff changeset	162 int index, len;
a61af66fc99e Initial load duke parents: diff changeset	163 unsigned int hashValue;
a61af66fc99e Initial load duke parents: diff changeset	164 char* name;
a61af66fc99e Initial load duke parents: diff changeset	165 {
a61af66fc99e Initial load duke parents: diff changeset	166 debug_only(No_Safepoint_Verifier nsv;)
a61af66fc99e Initial load duke parents: diff changeset	167
a61af66fc99e Initial load duke parents: diff changeset	168 name = (char*)sym->base() + begin;
a61af66fc99e Initial load duke parents: diff changeset	169 len = end - begin;
a61af66fc99e Initial load duke parents: diff changeset	170 hashValue = hash_symbol(name, len);
a61af66fc99e Initial load duke parents: diff changeset	171 index = the_table()->hash_to_index(hashValue);
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	172 Symbol* s = the_table()->lookup(index, name, len, hashValue);
0 a61af66fc99e Initial load duke parents: diff changeset	173
a61af66fc99e Initial load duke parents: diff changeset	174 // Found
a61af66fc99e Initial load duke parents: diff changeset	175 if (s != NULL) return s;
a61af66fc99e Initial load duke parents: diff changeset	176 }
a61af66fc99e Initial load duke parents: diff changeset	177
a61af66fc99e Initial load duke parents: diff changeset	178 // Otherwise, add to symbol to table. Copy to a C string first.
a61af66fc99e Initial load duke parents: diff changeset	179 char stack_buf[128];
a61af66fc99e Initial load duke parents: diff changeset	180 ResourceMark rm(THREAD);
a61af66fc99e Initial load duke parents: diff changeset	181 if (len <= 128) {
a61af66fc99e Initial load duke parents: diff changeset	182 buffer = stack_buf;
a61af66fc99e Initial load duke parents: diff changeset	183 } else {
a61af66fc99e Initial load duke parents: diff changeset	184 buffer = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
a61af66fc99e Initial load duke parents: diff changeset	185 }
a61af66fc99e Initial load duke parents: diff changeset	186 for (int i=0; i<len; i++) {
a61af66fc99e Initial load duke parents: diff changeset	187 buffer[i] = name[i];
a61af66fc99e Initial load duke parents: diff changeset	188 }
a61af66fc99e Initial load duke parents: diff changeset	189 // Make sure there is no safepoint in the code above since name can't move.
a61af66fc99e Initial load duke parents: diff changeset	190 // We can't include the code in No_Safepoint_Verifier because of the
a61af66fc99e Initial load duke parents: diff changeset	191 // ResourceMark.
a61af66fc99e Initial load duke parents: diff changeset	192
a61af66fc99e Initial load duke parents: diff changeset	193 return the_table()->basic_add(index, (u1*)buffer, len, hashValue, CHECK_NULL);
a61af66fc99e Initial load duke parents: diff changeset	194 }
a61af66fc99e Initial load duke parents: diff changeset	195
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	196 Symbol* SymbolTable::lookup_only(const char* name, int len,
0 a61af66fc99e Initial load duke parents: diff changeset	197 unsigned int& hash) {
a61af66fc99e Initial load duke parents: diff changeset	198 hash = hash_symbol(name, len);
a61af66fc99e Initial load duke parents: diff changeset	199 int index = the_table()->hash_to_index(hash);
a61af66fc99e Initial load duke parents: diff changeset	200
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	201 Symbol* s = the_table()->lookup(index, name, len, hash);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	202 return s;
0 a61af66fc99e Initial load duke parents: diff changeset	203 }
a61af66fc99e Initial load duke parents: diff changeset	204
665 c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	205 // Suggestion: Push unicode-based lookup all the way into the hashing
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	206 // and probing logic, so there is no need for convert_to_utf8 until
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	207 // an actual new Symbol* is created.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	208 Symbol* SymbolTable::lookup_unicode(const jchar* name, int utf16_length, TRAPS) {
665 c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	209 int utf8_length = UNICODE::utf8_length((jchar*) name, utf16_length);
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	210 char stack_buf[128];
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	211 if (utf8_length < (int) sizeof(stack_buf)) {
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	212 char* chars = stack_buf;
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	213 UNICODE::convert_to_utf8(name, utf16_length, chars);
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	214 return lookup(chars, utf8_length, THREAD);
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	215 } else {
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	216 ResourceMark rm(THREAD);
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	217 char* chars = NEW_RESOURCE_ARRAY(char, utf8_length + 1);;
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	218 UNICODE::convert_to_utf8(name, utf16_length, chars);
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	219 return lookup(chars, utf8_length, THREAD);
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	220 }
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	221 }
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	222
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	223 Symbol* SymbolTable::lookup_only_unicode(const jchar* name, int utf16_length,
665 c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	224 unsigned int& hash) {
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	225 int utf8_length = UNICODE::utf8_length((jchar*) name, utf16_length);
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	226 char stack_buf[128];
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	227 if (utf8_length < (int) sizeof(stack_buf)) {
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	228 char* chars = stack_buf;
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	229 UNICODE::convert_to_utf8(name, utf16_length, chars);
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	230 return lookup_only(chars, utf8_length, hash);
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	231 } else {
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	232 ResourceMark rm;
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	233 char* chars = NEW_RESOURCE_ARRAY(char, utf8_length + 1);;
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	234 UNICODE::convert_to_utf8(name, utf16_length, chars);
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	235 return lookup_only(chars, utf8_length, hash);
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	236 }
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	237 }
c89f86385056 6814659: separable cleanups and subroutines for 6655638 jrose parents: 605 diff changeset	238
0 a61af66fc99e Initial load duke parents: diff changeset	239 void SymbolTable::add(constantPoolHandle cp, int names_count,
a61af66fc99e Initial load duke parents: diff changeset	240 const char** names, int* lengths, int* cp_indices,
a61af66fc99e Initial load duke parents: diff changeset	241 unsigned int* hashValues, TRAPS) {
a61af66fc99e Initial load duke parents: diff changeset	242 SymbolTable* table = the_table();
a61af66fc99e Initial load duke parents: diff changeset	243 bool added = table->basic_add(cp, names_count, names, lengths,
a61af66fc99e Initial load duke parents: diff changeset	244 cp_indices, hashValues, CHECK);
a61af66fc99e Initial load duke parents: diff changeset	245 if (!added) {
a61af66fc99e Initial load duke parents: diff changeset	246 // do it the hard way
a61af66fc99e Initial load duke parents: diff changeset	247 for (int i=0; i<names_count; i++) {
a61af66fc99e Initial load duke parents: diff changeset	248 int index = table->hash_to_index(hashValues[i]);
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	249 Symbol* sym = table->basic_add(index, (u1*)names[i], lengths[i],
0 a61af66fc99e Initial load duke parents: diff changeset	250 hashValues[i], CHECK);
a61af66fc99e Initial load duke parents: diff changeset	251 cp->symbol_at_put(cp_indices[i], sym);
a61af66fc99e Initial load duke parents: diff changeset	252 }
a61af66fc99e Initial load duke parents: diff changeset	253 }
a61af66fc99e Initial load duke parents: diff changeset	254 }
a61af66fc99e Initial load duke parents: diff changeset	255
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	256 Symbol* SymbolTable::basic_add(int index, u1 *name, int len,
0 a61af66fc99e Initial load duke parents: diff changeset	257 unsigned int hashValue, TRAPS) {
a61af66fc99e Initial load duke parents: diff changeset	258 assert(!Universe::heap()->is_in_reserved(name) \|\| GC_locker::is_active(),
a61af66fc99e Initial load duke parents: diff changeset	259 "proposed name of symbol must be stable");
a61af66fc99e Initial load duke parents: diff changeset	260
a61af66fc99e Initial load duke parents: diff changeset	261 // We assume that lookup() has been called already, that it failed,
a61af66fc99e Initial load duke parents: diff changeset	262 // and symbol was not found. We create the symbol here.
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	263 Symbol* sym = allocate_symbol(name, len, CHECK_NULL);
0 a61af66fc99e Initial load duke parents: diff changeset	264
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	265 // Allocation must be done before grabbing the SymbolTable_lock lock
0 a61af66fc99e Initial load duke parents: diff changeset	266 MutexLocker ml(SymbolTable_lock, THREAD);
a61af66fc99e Initial load duke parents: diff changeset	267
a61af66fc99e Initial load duke parents: diff changeset	268 assert(sym->equals((char*)name, len), "symbol must be properly initialized");
a61af66fc99e Initial load duke parents: diff changeset	269
a61af66fc99e Initial load duke parents: diff changeset	270 // Since look-up was done lock-free, we need to check if another
a61af66fc99e Initial load duke parents: diff changeset	271 // thread beat us in the race to insert the symbol.
a61af66fc99e Initial load duke parents: diff changeset	272
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	273 Symbol* test = lookup(index, (char*)name, len, hashValue);
0 a61af66fc99e Initial load duke parents: diff changeset	274 if (test != NULL) {
605 98cb887364d3 6810672: Comment typos twisti parents: 0 diff changeset	275 // A race occurred and another thread introduced the symbol, this one
0 a61af66fc99e Initial load duke parents: diff changeset	276 // will be dropped and collected.
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	277 delete sym;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	278 assert(test->refcount() != 0, "lookup should have incremented the count");
0 a61af66fc99e Initial load duke parents: diff changeset	279 return test;
a61af66fc99e Initial load duke parents: diff changeset	280 }
a61af66fc99e Initial load duke parents: diff changeset	281
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	282 HashtableEntry<Symbol> entry = new_entry(hashValue, sym);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	283 sym->increment_refcount();
0 a61af66fc99e Initial load duke parents: diff changeset	284 add_entry(index, entry);
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	285 return sym;
0 a61af66fc99e Initial load duke parents: diff changeset	286 }
a61af66fc99e Initial load duke parents: diff changeset	287
a61af66fc99e Initial load duke parents: diff changeset	288 bool SymbolTable::basic_add(constantPoolHandle cp, int names_count,
a61af66fc99e Initial load duke parents: diff changeset	289 const char** names, int* lengths,
a61af66fc99e Initial load duke parents: diff changeset	290 int* cp_indices, unsigned int* hashValues,
a61af66fc99e Initial load duke parents: diff changeset	291 TRAPS) {
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	292 Symbol* syms[symbol_alloc_batch_size];
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	293 bool allocated = allocate_symbols(names_count, (const u1**)names, lengths,
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	294 syms, CHECK_false);
0 a61af66fc99e Initial load duke parents: diff changeset	295 if (!allocated) {
a61af66fc99e Initial load duke parents: diff changeset	296 return false;
a61af66fc99e Initial load duke parents: diff changeset	297 }
a61af66fc99e Initial load duke parents: diff changeset	298
a61af66fc99e Initial load duke parents: diff changeset	299 // Allocation must be done before grabbing the SymbolTable_lock lock
a61af66fc99e Initial load duke parents: diff changeset	300 MutexLocker ml(SymbolTable_lock, THREAD);
a61af66fc99e Initial load duke parents: diff changeset	301
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	302 for (int i=0; i<names_count; i++) {
0 a61af66fc99e Initial load duke parents: diff changeset	303 assert(syms[i]->equals(names[i], lengths[i]), "symbol must be properly initialized");
a61af66fc99e Initial load duke parents: diff changeset	304 // Since look-up was done lock-free, we need to check if another
a61af66fc99e Initial load duke parents: diff changeset	305 // thread beat us in the race to insert the symbol.
a61af66fc99e Initial load duke parents: diff changeset	306 int index = hash_to_index(hashValues[i]);
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	307 Symbol* test = lookup(index, names[i], lengths[i], hashValues[i]);
0 a61af66fc99e Initial load duke parents: diff changeset	308 if (test != NULL) {
605 98cb887364d3 6810672: Comment typos twisti parents: 0 diff changeset	309 // A race occurred and another thread introduced the symbol, this one
0 a61af66fc99e Initial load duke parents: diff changeset	310 // will be dropped and collected. Use test instead.
a61af66fc99e Initial load duke parents: diff changeset	311 cp->symbol_at_put(cp_indices[i], test);
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	312 assert(test->refcount() != 0, "lookup should have incremented the count");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	313 delete syms[i];
0 a61af66fc99e Initial load duke parents: diff changeset	314 } else {
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	315 Symbol* sym = syms[i];
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	316 HashtableEntry<Symbol> entry = new_entry(hashValues[i], sym);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	317 sym->increment_refcount(); // increment refcount in external hashtable
0 a61af66fc99e Initial load duke parents: diff changeset	318 add_entry(index, entry);
a61af66fc99e Initial load duke parents: diff changeset	319 cp->symbol_at_put(cp_indices[i], sym);
a61af66fc99e Initial load duke parents: diff changeset	320 }
a61af66fc99e Initial load duke parents: diff changeset	321 }
a61af66fc99e Initial load duke parents: diff changeset	322
a61af66fc99e Initial load duke parents: diff changeset	323 return true;
a61af66fc99e Initial load duke parents: diff changeset	324 }
a61af66fc99e Initial load duke parents: diff changeset	325
a61af66fc99e Initial load duke parents: diff changeset	326
a61af66fc99e Initial load duke parents: diff changeset	327 void SymbolTable::verify() {
a61af66fc99e Initial load duke parents: diff changeset	328 for (int i = 0; i < the_table()->table_size(); ++i) {
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	329 HashtableEntry<Symbol> p = the_table()->bucket(i);
0 a61af66fc99e Initial load duke parents: diff changeset	330 for ( ; p != NULL; p = p->next()) {
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	331 Symbol* s = (Symbol*)(p->literal());
0 a61af66fc99e Initial load duke parents: diff changeset	332 guarantee(s != NULL, "symbol is NULL");
a61af66fc99e Initial load duke parents: diff changeset	333 unsigned int h = hash_symbol((char*)s->bytes(), s->utf8_length());
a61af66fc99e Initial load duke parents: diff changeset	334 guarantee(p->hash() == h, "broken hash in symbol table entry");
a61af66fc99e Initial load duke parents: diff changeset	335 guarantee(the_table()->hash_to_index(h) == i,
a61af66fc99e Initial load duke parents: diff changeset	336 "wrong index in symbol table");
a61af66fc99e Initial load duke parents: diff changeset	337 }
a61af66fc99e Initial load duke parents: diff changeset	338 }
a61af66fc99e Initial load duke parents: diff changeset	339 }
a61af66fc99e Initial load duke parents: diff changeset	340
a61af66fc99e Initial load duke parents: diff changeset	341
a61af66fc99e Initial load duke parents: diff changeset	342 //---------------------------------------------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	343 // Non-product code
a61af66fc99e Initial load duke parents: diff changeset	344
a61af66fc99e Initial load duke parents: diff changeset	345 #ifndef PRODUCT
a61af66fc99e Initial load duke parents: diff changeset	346
a61af66fc99e Initial load duke parents: diff changeset	347 void SymbolTable::print_histogram() {
a61af66fc99e Initial load duke parents: diff changeset	348 MutexLocker ml(SymbolTable_lock);
a61af66fc99e Initial load duke parents: diff changeset	349 const int results_length = 100;
a61af66fc99e Initial load duke parents: diff changeset	350 int results[results_length];
a61af66fc99e Initial load duke parents: diff changeset	351 int i,j;
a61af66fc99e Initial load duke parents: diff changeset	352
a61af66fc99e Initial load duke parents: diff changeset	353 // initialize results to zero
a61af66fc99e Initial load duke parents: diff changeset	354 for (j = 0; j < results_length; j++) {
a61af66fc99e Initial load duke parents: diff changeset	355 results[j] = 0;
a61af66fc99e Initial load duke parents: diff changeset	356 }
a61af66fc99e Initial load duke parents: diff changeset	357
a61af66fc99e Initial load duke parents: diff changeset	358 int total = 0;
a61af66fc99e Initial load duke parents: diff changeset	359 int max_symbols = 0;
a61af66fc99e Initial load duke parents: diff changeset	360 int out_of_range = 0;
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	361 int memory_total = 0;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	362 int count = 0;
0 a61af66fc99e Initial load duke parents: diff changeset	363 for (i = 0; i < the_table()->table_size(); i++) {
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	364 HashtableEntry<Symbol> p = the_table()->bucket(i);
0 a61af66fc99e Initial load duke parents: diff changeset	365 for ( ; p != NULL; p = p->next()) {
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	366 memory_total += p->literal()->object_size();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	367 count++;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	368 int counter = p->literal()->utf8_length();
0 a61af66fc99e Initial load duke parents: diff changeset	369 total += counter;
a61af66fc99e Initial load duke parents: diff changeset	370 if (counter < results_length) {
a61af66fc99e Initial load duke parents: diff changeset	371 results[counter]++;
a61af66fc99e Initial load duke parents: diff changeset	372 } else {
a61af66fc99e Initial load duke parents: diff changeset	373 out_of_range++;
a61af66fc99e Initial load duke parents: diff changeset	374 }
a61af66fc99e Initial load duke parents: diff changeset	375 max_symbols = MAX2(max_symbols, counter);
a61af66fc99e Initial load duke parents: diff changeset	376 }
a61af66fc99e Initial load duke parents: diff changeset	377 }
a61af66fc99e Initial load duke parents: diff changeset	378 tty->print_cr("Symbol Table:");
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	379 tty->print_cr("Total number of symbols %5d", count);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	380 tty->print_cr("Total size in memory %5dK",
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	381 (memory_total*HeapWordSize)/1024);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	382 tty->print_cr("Total counted %5d", symbols_counted);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	383 tty->print_cr("Total removed %5d", symbols_removed);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	384 if (symbols_counted > 0) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	385 tty->print_cr("Percent removed %3.2f",
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	386 ((float)symbols_removed/(float)symbols_counted)* 100);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	387 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	388 tty->print_cr("Reference counts %5d", Symbol::_total_count);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	389 tty->print_cr("Histogram of symbol length:");
0 a61af66fc99e Initial load duke parents: diff changeset	390 tty->print_cr("%8s %5d", "Total ", total);
a61af66fc99e Initial load duke parents: diff changeset	391 tty->print_cr("%8s %5d", "Maximum", max_symbols);
a61af66fc99e Initial load duke parents: diff changeset	392 tty->print_cr("%8s %3.2f", "Average",
a61af66fc99e Initial load duke parents: diff changeset	393 ((float) total / (float) the_table()->table_size()));
a61af66fc99e Initial load duke parents: diff changeset	394 tty->print_cr("%s", "Histogram:");
a61af66fc99e Initial load duke parents: diff changeset	395 tty->print_cr(" %s %29s", "Length", "Number chains that length");
a61af66fc99e Initial load duke parents: diff changeset	396 for (i = 0; i < results_length; i++) {
a61af66fc99e Initial load duke parents: diff changeset	397 if (results[i] > 0) {
a61af66fc99e Initial load duke parents: diff changeset	398 tty->print_cr("%6d %10d", i, results[i]);
a61af66fc99e Initial load duke parents: diff changeset	399 }
a61af66fc99e Initial load duke parents: diff changeset	400 }
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	401 if (Verbose) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	402 int line_length = 70;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	403 tty->print_cr("%s %30s", " Length", "Number chains that length");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	404 for (i = 0; i < results_length; i++) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	405 if (results[i] > 0) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	406 tty->print("%4d", i);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	407 for (j = 0; (j < results[i]) && (j < line_length); j++) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	408 tty->print("%1s", "*");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	409 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	410 if (j == line_length) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	411 tty->print("%1s", "+");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	412 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	413 tty->cr();
0 a61af66fc99e Initial load duke parents: diff changeset	414 }
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	415 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	416 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	417 tty->print_cr(" %s %d: %d\n", "Number chains longer than",
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	418 results_length, out_of_range);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	419 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	420
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	421 void SymbolTable::print() {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	422 for (int i = 0; i < the_table()->table_size(); ++i) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	423 HashtableEntry<Symbol>* p = the_table()->bucket_addr(i);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	424 HashtableEntry<Symbol> entry = the_table()->bucket(i);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	425 if (entry != NULL) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	426 while (entry != NULL) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	427 tty->print(PTR_FORMAT " ", entry->literal());
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	428 entry->literal()->print();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	429 tty->print(" %d", entry->literal()->refcount());
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	430 p = entry->next_addr();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	431 entry = (HashtableEntry<Symbol>)HashtableEntry<Symbol>::make_ptr(p);
0 a61af66fc99e Initial load duke parents: diff changeset	432 }
a61af66fc99e Initial load duke parents: diff changeset	433 tty->cr();
a61af66fc99e Initial load duke parents: diff changeset	434 }
a61af66fc99e Initial load duke parents: diff changeset	435 }
a61af66fc99e Initial load duke parents: diff changeset	436 }
a61af66fc99e Initial load duke parents: diff changeset	437
a61af66fc99e Initial load duke parents: diff changeset	438 #endif // PRODUCT
a61af66fc99e Initial load duke parents: diff changeset	439
a61af66fc99e Initial load duke parents: diff changeset	440 // --------------------------------------------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	441
a61af66fc99e Initial load duke parents: diff changeset	442 #ifdef ASSERT
a61af66fc99e Initial load duke parents: diff changeset	443 class StableMemoryChecker : public StackObj {
a61af66fc99e Initial load duke parents: diff changeset	444 enum { _bufsize = wordSize*4 };
a61af66fc99e Initial load duke parents: diff changeset	445
a61af66fc99e Initial load duke parents: diff changeset	446 address _region;
a61af66fc99e Initial load duke parents: diff changeset	447 jint _size;
a61af66fc99e Initial load duke parents: diff changeset	448 u1 _save_buf[_bufsize];
a61af66fc99e Initial load duke parents: diff changeset	449
a61af66fc99e Initial load duke parents: diff changeset	450 int sample(u1* save_buf) {
a61af66fc99e Initial load duke parents: diff changeset	451 if (_size <= _bufsize) {
a61af66fc99e Initial load duke parents: diff changeset	452 memcpy(save_buf, _region, _size);
a61af66fc99e Initial load duke parents: diff changeset	453 return _size;
a61af66fc99e Initial load duke parents: diff changeset	454 } else {
a61af66fc99e Initial load duke parents: diff changeset	455 // copy head and tail
a61af66fc99e Initial load duke parents: diff changeset	456 memcpy(&save_buf[0], _region, _bufsize/2);
a61af66fc99e Initial load duke parents: diff changeset	457 memcpy(&save_buf[_bufsize/2], _region + _size - _bufsize/2, _bufsize/2);
a61af66fc99e Initial load duke parents: diff changeset	458 return (_bufsize/2)*2;
a61af66fc99e Initial load duke parents: diff changeset	459 }
a61af66fc99e Initial load duke parents: diff changeset	460 }
a61af66fc99e Initial load duke parents: diff changeset	461
a61af66fc99e Initial load duke parents: diff changeset	462 public:
a61af66fc99e Initial load duke parents: diff changeset	463 StableMemoryChecker(const void* region, jint size) {
a61af66fc99e Initial load duke parents: diff changeset	464 _region = (address) region;
a61af66fc99e Initial load duke parents: diff changeset	465 _size = size;
a61af66fc99e Initial load duke parents: diff changeset	466 sample(_save_buf);
a61af66fc99e Initial load duke parents: diff changeset	467 }
a61af66fc99e Initial load duke parents: diff changeset	468
a61af66fc99e Initial load duke parents: diff changeset	469 bool verify() {
a61af66fc99e Initial load duke parents: diff changeset	470 u1 check_buf[sizeof(_save_buf)];
a61af66fc99e Initial load duke parents: diff changeset	471 int check_size = sample(check_buf);
a61af66fc99e Initial load duke parents: diff changeset	472 return (0 == memcmp(_save_buf, check_buf, check_size));
a61af66fc99e Initial load duke parents: diff changeset	473 }
a61af66fc99e Initial load duke parents: diff changeset	474
a61af66fc99e Initial load duke parents: diff changeset	475 void set_region(const void* region) { _region = (address) region; }
a61af66fc99e Initial load duke parents: diff changeset	476 };
a61af66fc99e Initial load duke parents: diff changeset	477 #endif
a61af66fc99e Initial load duke parents: diff changeset	478
a61af66fc99e Initial load duke parents: diff changeset	479
a61af66fc99e Initial load duke parents: diff changeset	480 // --------------------------------------------------------------------------
a61af66fc99e Initial load duke parents: diff changeset	481
a61af66fc99e Initial load duke parents: diff changeset	482
a61af66fc99e Initial load duke parents: diff changeset	483 // Compute the hash value for a java.lang.String object which would
a61af66fc99e Initial load duke parents: diff changeset	484 // contain the characters passed in. This hash value is used for at
a61af66fc99e Initial load duke parents: diff changeset	485 // least two purposes.
a61af66fc99e Initial load duke parents: diff changeset	486 //
a61af66fc99e Initial load duke parents: diff changeset	487 // (a) As the hash value used by the StringTable for bucket selection
a61af66fc99e Initial load duke parents: diff changeset	488 // and comparison (stored in the HashtableEntry structures). This
a61af66fc99e Initial load duke parents: diff changeset	489 // is used in the String.intern() method.
a61af66fc99e Initial load duke parents: diff changeset	490 //
a61af66fc99e Initial load duke parents: diff changeset	491 // (b) As the hash value used by the String object itself, in
a61af66fc99e Initial load duke parents: diff changeset	492 // String.hashCode(). This value is normally calculate in Java code
a61af66fc99e Initial load duke parents: diff changeset	493 // in the String.hashCode method(), but is precomputed for String
a61af66fc99e Initial load duke parents: diff changeset	494 // objects in the shared archive file.
a61af66fc99e Initial load duke parents: diff changeset	495 //
a61af66fc99e Initial load duke parents: diff changeset	496 // For this reason, THIS ALGORITHM MUST MATCH String.hashCode().
a61af66fc99e Initial load duke parents: diff changeset	497
a61af66fc99e Initial load duke parents: diff changeset	498 int StringTable::hash_string(jchar* s, int len) {
a61af66fc99e Initial load duke parents: diff changeset	499 unsigned h = 0;
a61af66fc99e Initial load duke parents: diff changeset	500 while (len-- > 0) {
a61af66fc99e Initial load duke parents: diff changeset	501 h = 31h + (unsigned) s;
a61af66fc99e Initial load duke parents: diff changeset	502 s++;
a61af66fc99e Initial load duke parents: diff changeset	503 }
a61af66fc99e Initial load duke parents: diff changeset	504 return h;
a61af66fc99e Initial load duke parents: diff changeset	505 }
a61af66fc99e Initial load duke parents: diff changeset	506
a61af66fc99e Initial load duke parents: diff changeset	507
a61af66fc99e Initial load duke parents: diff changeset	508 StringTable* StringTable::_the_table = NULL;
a61af66fc99e Initial load duke parents: diff changeset	509
a61af66fc99e Initial load duke parents: diff changeset	510 oop StringTable::lookup(int index, jchar* name,
a61af66fc99e Initial load duke parents: diff changeset	511 int len, unsigned int hash) {
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	512 for (HashtableEntry<oop>* l = bucket(index); l != NULL; l = l->next()) {
0 a61af66fc99e Initial load duke parents: diff changeset	513 if (l->hash() == hash) {
a61af66fc99e Initial load duke parents: diff changeset	514 if (java_lang_String::equals(l->literal(), name, len)) {
a61af66fc99e Initial load duke parents: diff changeset	515 return l->literal();
a61af66fc99e Initial load duke parents: diff changeset	516 }
a61af66fc99e Initial load duke parents: diff changeset	517 }
a61af66fc99e Initial load duke parents: diff changeset	518 }
a61af66fc99e Initial load duke parents: diff changeset	519 return NULL;
a61af66fc99e Initial load duke parents: diff changeset	520 }
a61af66fc99e Initial load duke parents: diff changeset	521
a61af66fc99e Initial load duke parents: diff changeset	522
a61af66fc99e Initial load duke parents: diff changeset	523 oop StringTable::basic_add(int index, Handle string_or_null, jchar* name,
a61af66fc99e Initial load duke parents: diff changeset	524 int len, unsigned int hashValue, TRAPS) {
a61af66fc99e Initial load duke parents: diff changeset	525 debug_only(StableMemoryChecker smc(name, len * sizeof(name[0])));
a61af66fc99e Initial load duke parents: diff changeset	526 assert(!Universe::heap()->is_in_reserved(name) \|\| GC_locker::is_active(),
a61af66fc99e Initial load duke parents: diff changeset	527 "proposed name of symbol must be stable");
a61af66fc99e Initial load duke parents: diff changeset	528
a61af66fc99e Initial load duke parents: diff changeset	529 Handle string;
a61af66fc99e Initial load duke parents: diff changeset	530 // try to reuse the string if possible
a61af66fc99e Initial load duke parents: diff changeset	531 if (!string_or_null.is_null() && string_or_null()->is_perm()) {
a61af66fc99e Initial load duke parents: diff changeset	532 string = string_or_null;
a61af66fc99e Initial load duke parents: diff changeset	533 } else {
a61af66fc99e Initial load duke parents: diff changeset	534 string = java_lang_String::create_tenured_from_unicode(name, len, CHECK_NULL);
a61af66fc99e Initial load duke parents: diff changeset	535 }
a61af66fc99e Initial load duke parents: diff changeset	536
a61af66fc99e Initial load duke parents: diff changeset	537 // Allocation must be done before grapping the SymbolTable_lock lock
a61af66fc99e Initial load duke parents: diff changeset	538 MutexLocker ml(StringTable_lock, THREAD);
a61af66fc99e Initial load duke parents: diff changeset	539
a61af66fc99e Initial load duke parents: diff changeset	540 assert(java_lang_String::equals(string(), name, len),
a61af66fc99e Initial load duke parents: diff changeset	541 "string must be properly initialized");
a61af66fc99e Initial load duke parents: diff changeset	542
a61af66fc99e Initial load duke parents: diff changeset	543 // Since look-up was done lock-free, we need to check if another
a61af66fc99e Initial load duke parents: diff changeset	544 // thread beat us in the race to insert the symbol.
a61af66fc99e Initial load duke parents: diff changeset	545
a61af66fc99e Initial load duke parents: diff changeset	546 oop test = lookup(index, name, len, hashValue); // calls lookup(u1*, int)
a61af66fc99e Initial load duke parents: diff changeset	547 if (test != NULL) {
a61af66fc99e Initial load duke parents: diff changeset	548 // Entry already added
a61af66fc99e Initial load duke parents: diff changeset	549 return test;
a61af66fc99e Initial load duke parents: diff changeset	550 }
a61af66fc99e Initial load duke parents: diff changeset	551
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	552 HashtableEntry<oop>* entry = new_entry(hashValue, string());
0 a61af66fc99e Initial load duke parents: diff changeset	553 add_entry(index, entry);
a61af66fc99e Initial load duke parents: diff changeset	554 return string();
a61af66fc99e Initial load duke parents: diff changeset	555 }
a61af66fc99e Initial load duke parents: diff changeset	556
a61af66fc99e Initial load duke parents: diff changeset	557
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	558 oop StringTable::lookup(Symbol* symbol) {
0 a61af66fc99e Initial load duke parents: diff changeset	559 ResourceMark rm;
a61af66fc99e Initial load duke parents: diff changeset	560 int length;
a61af66fc99e Initial load duke parents: diff changeset	561 jchar* chars = symbol->as_unicode(length);
a61af66fc99e Initial load duke parents: diff changeset	562 unsigned int hashValue = hash_string(chars, length);
a61af66fc99e Initial load duke parents: diff changeset	563 int index = the_table()->hash_to_index(hashValue);
a61af66fc99e Initial load duke parents: diff changeset	564 return the_table()->lookup(index, chars, length, hashValue);
a61af66fc99e Initial load duke parents: diff changeset	565 }
a61af66fc99e Initial load duke parents: diff changeset	566
a61af66fc99e Initial load duke parents: diff changeset	567
a61af66fc99e Initial load duke parents: diff changeset	568 oop StringTable::intern(Handle string_or_null, jchar* name,
a61af66fc99e Initial load duke parents: diff changeset	569 int len, TRAPS) {
a61af66fc99e Initial load duke parents: diff changeset	570 unsigned int hashValue = hash_string(name, len);
a61af66fc99e Initial load duke parents: diff changeset	571 int index = the_table()->hash_to_index(hashValue);
a61af66fc99e Initial load duke parents: diff changeset	572 oop string = the_table()->lookup(index, name, len, hashValue);
a61af66fc99e Initial load duke parents: diff changeset	573
a61af66fc99e Initial load duke parents: diff changeset	574 // Found
a61af66fc99e Initial load duke parents: diff changeset	575 if (string != NULL) return string;
a61af66fc99e Initial load duke parents: diff changeset	576
a61af66fc99e Initial load duke parents: diff changeset	577 // Otherwise, add to symbol to table
a61af66fc99e Initial load duke parents: diff changeset	578 return the_table()->basic_add(index, string_or_null, name, len,
a61af66fc99e Initial load duke parents: diff changeset	579 hashValue, CHECK_NULL);
a61af66fc99e Initial load duke parents: diff changeset	580 }
a61af66fc99e Initial load duke parents: diff changeset	581
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	582 oop StringTable::intern(Symbol* symbol, TRAPS) {
0 a61af66fc99e Initial load duke parents: diff changeset	583 if (symbol == NULL) return NULL;
a61af66fc99e Initial load duke parents: diff changeset	584 ResourceMark rm(THREAD);
a61af66fc99e Initial load duke parents: diff changeset	585 int length;
a61af66fc99e Initial load duke parents: diff changeset	586 jchar* chars = symbol->as_unicode(length);
a61af66fc99e Initial load duke parents: diff changeset	587 Handle string;
a61af66fc99e Initial load duke parents: diff changeset	588 oop result = intern(string, chars, length, CHECK_NULL);
a61af66fc99e Initial load duke parents: diff changeset	589 return result;
a61af66fc99e Initial load duke parents: diff changeset	590 }
a61af66fc99e Initial load duke parents: diff changeset	591
a61af66fc99e Initial load duke parents: diff changeset	592
a61af66fc99e Initial load duke parents: diff changeset	593 oop StringTable::intern(oop string, TRAPS)
a61af66fc99e Initial load duke parents: diff changeset	594 {
a61af66fc99e Initial load duke parents: diff changeset	595 if (string == NULL) return NULL;
a61af66fc99e Initial load duke parents: diff changeset	596 ResourceMark rm(THREAD);
a61af66fc99e Initial load duke parents: diff changeset	597 int length;
a61af66fc99e Initial load duke parents: diff changeset	598 Handle h_string (THREAD, string);
a61af66fc99e Initial load duke parents: diff changeset	599 jchar* chars = java_lang_String::as_unicode_string(string, length);
a61af66fc99e Initial load duke parents: diff changeset	600 oop result = intern(h_string, chars, length, CHECK_NULL);
a61af66fc99e Initial load duke parents: diff changeset	601 return result;
a61af66fc99e Initial load duke parents: diff changeset	602 }
a61af66fc99e Initial load duke parents: diff changeset	603
a61af66fc99e Initial load duke parents: diff changeset	604
a61af66fc99e Initial load duke parents: diff changeset	605 oop StringTable::intern(const char* utf8_string, TRAPS) {
a61af66fc99e Initial load duke parents: diff changeset	606 if (utf8_string == NULL) return NULL;
a61af66fc99e Initial load duke parents: diff changeset	607 ResourceMark rm(THREAD);
a61af66fc99e Initial load duke parents: diff changeset	608 int length = UTF8::unicode_length(utf8_string);
a61af66fc99e Initial load duke parents: diff changeset	609 jchar* chars = NEW_RESOURCE_ARRAY(jchar, length);
a61af66fc99e Initial load duke parents: diff changeset	610 UTF8::convert_to_unicode(utf8_string, chars, length);
a61af66fc99e Initial load duke parents: diff changeset	611 Handle string;
a61af66fc99e Initial load duke parents: diff changeset	612 oop result = intern(string, chars, length, CHECK_NULL);
a61af66fc99e Initial load duke parents: diff changeset	613 return result;
a61af66fc99e Initial load duke parents: diff changeset	614 }
a61af66fc99e Initial load duke parents: diff changeset	615
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	616 void StringTable::unlink(BoolObjectClosure* is_alive) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	617 // Readers of the table are unlocked, so we should only be removing
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	618 // entries at a safepoint.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	619 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	620 for (int i = 0; i < the_table()->table_size(); ++i) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	621 for (HashtableEntry<oop>** p = the_table()->bucket_addr(i); *p != NULL; ) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	622 HashtableEntry<oop>* entry = *p;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	623 if (entry->is_shared()) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	624 break;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	625 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	626 assert(entry->literal() != NULL, "just checking");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	627 if (is_alive->do_object_b(entry->literal())) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	628 p = entry->next_addr();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	629 } else {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	630 *p = entry->next();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	631 the_table()->free_entry(entry);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	632 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	633 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	634 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	635 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	636
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	637 void StringTable::oops_do(OopClosure* f) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	638 for (int i = 0; i < the_table()->table_size(); ++i) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	639 HashtableEntry<oop>** p = the_table()->bucket_addr(i);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	640 HashtableEntry<oop>* entry = the_table()->bucket(i);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	641 while (entry != NULL) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	642 f->do_oop((oop*)entry->literal_addr());
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	643
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	644 // Did the closure remove the literal from the table?
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	645 if (entry->literal() == NULL) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	646 assert(!entry->is_shared(), "immutable hashtable entry?");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	647 *p = entry->next();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	648 the_table()->free_entry(entry);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	649 } else {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	650 p = entry->next_addr();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	651 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	652 entry = (HashtableEntry<oop>)HashtableEntry<oop>::make_ptr(p);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	653 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	654 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	655 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	656
0 a61af66fc99e Initial load duke parents: diff changeset	657 void StringTable::verify() {
a61af66fc99e Initial load duke parents: diff changeset	658 for (int i = 0; i < the_table()->table_size(); ++i) {
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	659 HashtableEntry<oop>* p = the_table()->bucket(i);
0 a61af66fc99e Initial load duke parents: diff changeset	660 for ( ; p != NULL; p = p->next()) {
a61af66fc99e Initial load duke parents: diff changeset	661 oop s = p->literal();
a61af66fc99e Initial load duke parents: diff changeset	662 guarantee(s != NULL, "interned string is NULL");
a61af66fc99e Initial load duke parents: diff changeset	663 guarantee(s->is_perm(), "interned string not in permspace");
a61af66fc99e Initial load duke parents: diff changeset	664
a61af66fc99e Initial load duke parents: diff changeset	665 int length;
a61af66fc99e Initial load duke parents: diff changeset	666 jchar* chars = java_lang_String::as_unicode_string(s, length);
a61af66fc99e Initial load duke parents: diff changeset	667 unsigned int h = hash_string(chars, length);
a61af66fc99e Initial load duke parents: diff changeset	668 guarantee(p->hash() == h, "broken hash in string table entry");
a61af66fc99e Initial load duke parents: diff changeset	669 guarantee(the_table()->hash_to_index(h) == i,
a61af66fc99e Initial load duke parents: diff changeset	670 "wrong index in string table");
a61af66fc99e Initial load duke parents: diff changeset	671 }
a61af66fc99e Initial load duke parents: diff changeset	672 }
a61af66fc99e Initial load duke parents: diff changeset	673 }

Mercurial > hg > truffle

annotate src/share/vm/classfile/symbolTable.cpp @ 2244:4f26f535a225