author | coleenp |
Mon, 25 Jun 2012 21:33:35 -0400 | |
changeset 13097 | c146b608d91f |
parent 13087 | 673ea6efaf18 |
child 13195 | be27e1b6a4b9 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "classfile/altHashing.hpp" |
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#include "classfile/javaClasses.hpp" |
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#include "classfile/symbolTable.hpp" |
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#include "classfile/systemDictionary.hpp" |
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#include "gc_interface/collectedHeap.inline.hpp" |
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#include "memory/allocation.inline.hpp" |
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#include "memory/filemap.hpp" |
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#include "memory/gcLocker.inline.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "oops/oop.inline2.hpp" |
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#include "runtime/mutexLocker.hpp" |
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#include "utilities/hashtable.inline.hpp" |
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#include "utilities/numberSeq.hpp" |
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// -------------------------------------------------------------------------- |
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SymbolTable* SymbolTable::_the_table = NULL; |
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// Static arena for symbols that are not deallocated |
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Arena* SymbolTable::_arena = NULL; |
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bool SymbolTable::_needs_rehashing = false; |
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jint SymbolTable::_seed = 0; |
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Symbol* SymbolTable::allocate_symbol(const u1* name, int len, bool c_heap, TRAPS) { |
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assert (len <= Symbol::max_length(), "should be checked by caller"); |
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Symbol* sym; |
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// Allocate symbols in the C heap when dumping shared spaces in case there |
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// are temporary symbols we can remove. |
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if (c_heap || DumpSharedSpaces) { |
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// refcount starts as 1 |
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sym = new (len, THREAD) Symbol(name, len, 1); |
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} else { |
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sym = new (len, arena(), THREAD) Symbol(name, len, -1); |
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} |
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assert(sym != NULL, "new should call vm_exit_out_of_memory if C_HEAP is exhausted"); |
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return sym; |
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} |
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void SymbolTable::initialize_symbols(int arena_alloc_size) { |
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// Initialize the arena for global symbols, size passed in depends on CDS. |
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if (arena_alloc_size == 0) { |
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_arena = new Arena(); |
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} else { |
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_arena = new Arena(arena_alloc_size); |
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} |
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} |
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// Call function for all symbols in the symbol table. |
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void SymbolTable::symbols_do(SymbolClosure *cl) { |
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const int n = the_table()->table_size(); |
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for (int i = 0; i < n; i++) { |
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for (HashtableEntry<Symbol*>* p = the_table()->bucket(i); |
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p != NULL; |
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p = p->next()) { |
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cl->do_symbol(p->literal_addr()); |
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} |
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} |
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} |
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int SymbolTable::symbols_removed = 0; |
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int SymbolTable::symbols_counted = 0; |
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// Remove unreferenced symbols from the symbol table |
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// This is done late during GC. |
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void SymbolTable::unlink() { |
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int removed = 0; |
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int total = 0; |
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size_t memory_total = 0; |
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for (int i = 0; i < the_table()->table_size(); ++i) { |
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HashtableEntry<Symbol*>** p = the_table()->bucket_addr(i); |
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HashtableEntry<Symbol*>* entry = the_table()->bucket(i); |
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while (entry != NULL) { |
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// Shared entries are normally at the end of the bucket and if we run into |
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// a shared entry, then there is nothing more to remove. However, if we |
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// have rehashed the table, then the shared entries are no longer at the |
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// end of the bucket. |
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if (entry->is_shared() && !use_alternate_hashcode()) { |
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break; |
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} |
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Symbol* s = entry->literal(); |
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memory_total += s->object_size(); |
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total++; |
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assert(s != NULL, "just checking"); |
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// If reference count is zero, remove. |
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if (s->refcount() == 0) { |
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assert(!entry->is_shared(), "shared entries should be kept live"); |
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delete s; |
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removed++; |
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*p = entry->next(); |
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the_table()->free_entry(entry); |
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} else { |
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p = entry->next_addr(); |
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} |
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// get next entry |
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entry = (HashtableEntry<Symbol*>*)HashtableEntry<Symbol*>::make_ptr(*p); |
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} |
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} |
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symbols_removed += removed; |
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symbols_counted += total; |
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// Exclude printing for normal PrintGCDetails because people parse |
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// this output. |
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if (PrintGCDetails && Verbose && WizardMode) { |
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gclog_or_tty->print(" [Symbols=%d size=" SIZE_FORMAT "K] ", total, |
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(memory_total*HeapWordSize)/1024); |
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} |
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} |
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unsigned int SymbolTable::new_hash(Symbol* sym) { |
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ResourceMark rm; |
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// Use alternate hashing algorithm on this symbol. |
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return AltHashing::murmur3_32(seed(), (const jbyte*)sym->as_C_string(), sym->utf8_length()); |
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} |
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// Create a new table and using alternate hash code, populate the new table |
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// with the existing strings. Set flag to use the alternate hash code afterwards. |
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void SymbolTable::rehash_table() { |
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assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
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// This should never happen with -Xshare:dump but it might in testing mode. |
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if (DumpSharedSpaces) return; |
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// Create a new symbol table |
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SymbolTable* new_table = new SymbolTable(); |
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// Initialize the global seed for hashing. |
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_seed = AltHashing::compute_seed(); |
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assert(seed() != 0, "shouldn't be zero"); |
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the_table()->move_to(new_table); |
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// Delete the table and buckets (entries are reused in new table). |
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delete _the_table; |
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// Don't check if we need rehashing until the table gets unbalanced again. |
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// Then rehash with a new global seed. |
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_needs_rehashing = false; |
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_the_table = new_table; |
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} |
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// Lookup a symbol in a bucket. |
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Symbol* SymbolTable::lookup(int index, const char* name, |
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int len, unsigned int hash) { |
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int count = 0; |
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for (HashtableEntry<Symbol*>* e = bucket(index); e != NULL; e = e->next()) { |
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count++; // count all entries in this bucket, not just ones with same hash |
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if (e->hash() == hash) { |
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Symbol* sym = e->literal(); |
1 | 171 |
if (sym->equals(name, len)) { |
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// something is referencing this symbol now. |
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sym->increment_refcount(); |
1 | 174 |
return sym; |
175 |
} |
|
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} |
|
177 |
} |
|
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// If the bucket size is too deep check if this hash code is insufficient. |
179 |
if (count >= BasicHashtable::rehash_count && !needs_rehashing()) { |
|
180 |
_needs_rehashing = check_rehash_table(count); |
|
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} |
|
1 | 182 |
return NULL; |
183 |
} |
|
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// Pick hashing algorithm. |
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unsigned int SymbolTable::hash_symbol(const char* s, int len) { |
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return use_alternate_hashcode() ? |
188 |
AltHashing::murmur3_32(seed(), (const jbyte*)s, len) : |
|
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java_lang_String::to_hash(s, len); |
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} |
191 |
||
1 | 192 |
|
193 |
// We take care not to be blocking while holding the |
|
194 |
// SymbolTable_lock. Otherwise, the system might deadlock, since the |
|
195 |
// symboltable is used during compilation (VM_thread) The lock free |
|
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// synchronization is simplified by the fact that we do not delete |
|
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// entries in the symbol table during normal execution (only during |
|
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// safepoints). |
|
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Symbol* SymbolTable::lookup(const char* name, int len, TRAPS) { |
1 | 201 |
unsigned int hashValue = hash_symbol(name, len); |
202 |
int index = the_table()->hash_to_index(hashValue); |
|
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Symbol* s = the_table()->lookup(index, name, len, hashValue); |
1 | 205 |
|
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// Found |
|
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if (s != NULL) return s; |
|
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// Grab SymbolTable_lock first. |
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MutexLocker ml(SymbolTable_lock, THREAD); |
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|
1 | 212 |
// Otherwise, add to symbol to table |
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return the_table()->basic_add(index, (u1*)name, len, hashValue, true, CHECK_NULL); |
1 | 214 |
} |
215 |
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Symbol* SymbolTable::lookup(const Symbol* sym, int begin, int end, TRAPS) { |
1 | 217 |
char* buffer; |
218 |
int index, len; |
|
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unsigned int hashValue; |
|
220 |
char* name; |
|
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{ |
|
222 |
debug_only(No_Safepoint_Verifier nsv;) |
|
223 |
||
224 |
name = (char*)sym->base() + begin; |
|
225 |
len = end - begin; |
|
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hashValue = hash_symbol(name, len); |
|
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index = the_table()->hash_to_index(hashValue); |
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Symbol* s = the_table()->lookup(index, name, len, hashValue); |
1 | 229 |
|
230 |
// Found |
|
231 |
if (s != NULL) return s; |
|
232 |
} |
|
233 |
||
234 |
// Otherwise, add to symbol to table. Copy to a C string first. |
|
235 |
char stack_buf[128]; |
|
236 |
ResourceMark rm(THREAD); |
|
237 |
if (len <= 128) { |
|
238 |
buffer = stack_buf; |
|
239 |
} else { |
|
240 |
buffer = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len); |
|
241 |
} |
|
242 |
for (int i=0; i<len; i++) { |
|
243 |
buffer[i] = name[i]; |
|
244 |
} |
|
245 |
// Make sure there is no safepoint in the code above since name can't move. |
|
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// We can't include the code in No_Safepoint_Verifier because of the |
|
247 |
// ResourceMark. |
|
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// Grab SymbolTable_lock first. |
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MutexLocker ml(SymbolTable_lock, THREAD); |
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return the_table()->basic_add(index, (u1*)buffer, len, hashValue, true, CHECK_NULL); |
1 | 253 |
} |
254 |
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Symbol* SymbolTable::lookup_only(const char* name, int len, |
1 | 256 |
unsigned int& hash) { |
257 |
hash = hash_symbol(name, len); |
|
258 |
int index = the_table()->hash_to_index(hash); |
|
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Symbol* s = the_table()->lookup(index, name, len, hash); |
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return s; |
1 | 262 |
} |
263 |
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// Look up the address of the literal in the SymbolTable for this Symbol* |
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// Do not create any new symbols |
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// Do not increment the reference count to keep this alive |
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Symbol** SymbolTable::lookup_symbol_addr(Symbol* sym){ |
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unsigned int hash = hash_symbol((char*)sym->bytes(), sym->utf8_length()); |
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int index = the_table()->hash_to_index(hash); |
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270 |
|
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for (HashtableEntry<Symbol*>* e = the_table()->bucket(index); e != NULL; e = e->next()) { |
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if (e->hash() == hash) { |
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Symbol* literal_sym = e->literal(); |
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if (sym == literal_sym) { |
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return e->literal_addr(); |
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} |
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} |
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} |
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return NULL; |
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280 |
} |
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281 |
|
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// Suggestion: Push unicode-based lookup all the way into the hashing |
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// and probing logic, so there is no need for convert_to_utf8 until |
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// an actual new Symbol* is created. |
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Symbol* SymbolTable::lookup_unicode(const jchar* name, int utf16_length, TRAPS) { |
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int utf8_length = UNICODE::utf8_length((jchar*) name, utf16_length); |
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char stack_buf[128]; |
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if (utf8_length < (int) sizeof(stack_buf)) { |
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char* chars = stack_buf; |
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UNICODE::convert_to_utf8(name, utf16_length, chars); |
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return lookup(chars, utf8_length, THREAD); |
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} else { |
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ResourceMark rm(THREAD); |
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294 |
char* chars = NEW_RESOURCE_ARRAY(char, utf8_length + 1);; |
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UNICODE::convert_to_utf8(name, utf16_length, chars); |
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return lookup(chars, utf8_length, THREAD); |
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} |
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} |
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|
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Symbol* SymbolTable::lookup_only_unicode(const jchar* name, int utf16_length, |
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unsigned int& hash) { |
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int utf8_length = UNICODE::utf8_length((jchar*) name, utf16_length); |
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char stack_buf[128]; |
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304 |
if (utf8_length < (int) sizeof(stack_buf)) { |
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char* chars = stack_buf; |
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306 |
UNICODE::convert_to_utf8(name, utf16_length, chars); |
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return lookup_only(chars, utf8_length, hash); |
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} else { |
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ResourceMark rm; |
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char* chars = NEW_RESOURCE_ARRAY(char, utf8_length + 1);; |
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311 |
UNICODE::convert_to_utf8(name, utf16_length, chars); |
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return lookup_only(chars, utf8_length, hash); |
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} |
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} |
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|
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void SymbolTable::add(Handle class_loader, constantPoolHandle cp, |
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int names_count, |
1 | 318 |
const char** names, int* lengths, int* cp_indices, |
319 |
unsigned int* hashValues, TRAPS) { |
|
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// Grab SymbolTable_lock first. |
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MutexLocker ml(SymbolTable_lock, THREAD); |
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|
1 | 323 |
SymbolTable* table = the_table(); |
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324 |
bool added = table->basic_add(class_loader, cp, names_count, names, lengths, |
1 | 325 |
cp_indices, hashValues, CHECK); |
326 |
if (!added) { |
|
327 |
// do it the hard way |
|
328 |
for (int i=0; i<names_count; i++) { |
|
329 |
int index = table->hash_to_index(hashValues[i]); |
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bool c_heap = class_loader() != NULL; |
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331 |
Symbol* sym = table->basic_add(index, (u1*)names[i], lengths[i], hashValues[i], c_heap, CHECK); |
1 | 332 |
cp->symbol_at_put(cp_indices[i], sym); |
333 |
} |
|
334 |
} |
|
335 |
} |
|
336 |
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Symbol* SymbolTable::new_permanent_symbol(const char* name, TRAPS) { |
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unsigned int hash; |
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Symbol* result = SymbolTable::lookup_only((char*)name, (int)strlen(name), hash); |
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if (result != NULL) { |
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return result; |
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} |
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// Grab SymbolTable_lock first. |
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MutexLocker ml(SymbolTable_lock, THREAD); |
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|
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SymbolTable* table = the_table(); |
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int index = table->hash_to_index(hash); |
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return table->basic_add(index, (u1*)name, (int)strlen(name), hash, false, THREAD); |
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|
349 |
} |
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350 |
|
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|
351 |
Symbol* SymbolTable::basic_add(int index_arg, u1 *name, int len, |
13087 | 352 |
unsigned int hashValue_arg, bool c_heap, TRAPS) { |
1 | 353 |
assert(!Universe::heap()->is_in_reserved(name) || GC_locker::is_active(), |
354 |
"proposed name of symbol must be stable"); |
|
355 |
||
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|
356 |
// Don't allow symbols to be created which cannot fit in a Symbol*. |
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|
357 |
if (len > Symbol::max_length()) { |
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|
358 |
THROW_MSG_0(vmSymbols::java_lang_InternalError(), |
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|
359 |
"name is too long to represent"); |
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|
360 |
} |
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|
361 |
|
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|
362 |
// Cannot hit a safepoint in this function because the "this" pointer can move. |
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|
363 |
No_Safepoint_Verifier nsv; |
1 | 364 |
|
13087 | 365 |
// Check if the symbol table has been rehashed, if so, need to recalculate |
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|
366 |
// the hash value and index. |
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|
367 |
unsigned int hashValue; |
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|
368 |
int index; |
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|
369 |
if (use_alternate_hashcode()) { |
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|
370 |
hashValue = hash_symbol((const char*)name, len); |
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|
371 |
index = hash_to_index(hashValue); |
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|
372 |
} else { |
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|
373 |
hashValue = hashValue_arg; |
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|
374 |
index = index_arg; |
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|
375 |
} |
13087 | 376 |
|
1 | 377 |
// Since look-up was done lock-free, we need to check if another |
378 |
// thread beat us in the race to insert the symbol. |
|
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|
379 |
Symbol* test = lookup(index, (char*)name, len, hashValue); |
1 | 380 |
if (test != NULL) { |
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381 |
// A race occurred and another thread introduced the symbol. |
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|
382 |
assert(test->refcount() != 0, "lookup should have incremented the count"); |
1 | 383 |
return test; |
384 |
} |
|
385 |
||
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|
386 |
// Create a new symbol. |
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|
387 |
Symbol* sym = allocate_symbol(name, len, c_heap, CHECK_NULL); |
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|
388 |
assert(sym->equals((char*)name, len), "symbol must be properly initialized"); |
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|
389 |
|
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|
390 |
HashtableEntry<Symbol*>* entry = new_entry(hashValue, sym); |
1 | 391 |
add_entry(index, entry); |
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|
392 |
return sym; |
1 | 393 |
} |
394 |
||
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|
395 |
// This version of basic_add adds symbols in batch from the constant pool |
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|
396 |
// parsing. |
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|
397 |
bool SymbolTable::basic_add(Handle class_loader, constantPoolHandle cp, |
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|
398 |
int names_count, |
1 | 399 |
const char** names, int* lengths, |
400 |
int* cp_indices, unsigned int* hashValues, |
|
401 |
TRAPS) { |
|
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|
402 |
|
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|
403 |
// Check symbol names are not too long. If any are too long, don't add any. |
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|
404 |
for (int i = 0; i< names_count; i++) { |
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|
405 |
if (lengths[i] > Symbol::max_length()) { |
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|
406 |
THROW_MSG_0(vmSymbols::java_lang_InternalError(), |
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|
407 |
"name is too long to represent"); |
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|
408 |
} |
1 | 409 |
} |
410 |
||
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|
411 |
// Cannot hit a safepoint in this function because the "this" pointer can move. |
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|
412 |
No_Safepoint_Verifier nsv; |
1 | 413 |
|
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|
414 |
for (int i=0; i<names_count; i++) { |
13087 | 415 |
// Check if the symbol table has been rehashed, if so, need to recalculate |
416 |
// the hash value. |
|
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|
417 |
unsigned int hashValue; |
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|
418 |
if (use_alternate_hashcode()) { |
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|
419 |
hashValue = hash_symbol(names[i], lengths[i]); |
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|
420 |
} else { |
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|
421 |
hashValue = hashValues[i]; |
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|
422 |
} |
1 | 423 |
// Since look-up was done lock-free, we need to check if another |
424 |
// thread beat us in the race to insert the symbol. |
|
13087 | 425 |
int index = hash_to_index(hashValue); |
426 |
Symbol* test = lookup(index, names[i], lengths[i], hashValue); |
|
1 | 427 |
if (test != NULL) { |
2131 | 428 |
// A race occurred and another thread introduced the symbol, this one |
1 | 429 |
// will be dropped and collected. Use test instead. |
430 |
cp->symbol_at_put(cp_indices[i], test); |
|
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|
431 |
assert(test->refcount() != 0, "lookup should have incremented the count"); |
1 | 432 |
} else { |
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|
433 |
// Create a new symbol. The null class loader is never unloaded so these |
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|
434 |
// are allocated specially in a permanent arena. |
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|
435 |
bool c_heap = class_loader() != NULL; |
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|
436 |
Symbol* sym = allocate_symbol((const u1*)names[i], lengths[i], c_heap, CHECK_(false)); |
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|
437 |
assert(sym->equals(names[i], lengths[i]), "symbol must be properly initialized"); // why wouldn't it be??? |
13087 | 438 |
HashtableEntry<Symbol*>* entry = new_entry(hashValue, sym); |
1 | 439 |
add_entry(index, entry); |
440 |
cp->symbol_at_put(cp_indices[i], sym); |
|
441 |
} |
|
442 |
} |
|
443 |
return true; |
|
444 |
} |
|
445 |
||
446 |
||
447 |
void SymbolTable::verify() { |
|
448 |
for (int i = 0; i < the_table()->table_size(); ++i) { |
|
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|
449 |
HashtableEntry<Symbol*>* p = the_table()->bucket(i); |
1 | 450 |
for ( ; p != NULL; p = p->next()) { |
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|
451 |
Symbol* s = (Symbol*)(p->literal()); |
1 | 452 |
guarantee(s != NULL, "symbol is NULL"); |
453 |
unsigned int h = hash_symbol((char*)s->bytes(), s->utf8_length()); |
|
454 |
guarantee(p->hash() == h, "broken hash in symbol table entry"); |
|
455 |
guarantee(the_table()->hash_to_index(h) == i, |
|
456 |
"wrong index in symbol table"); |
|
457 |
} |
|
458 |
} |
|
459 |
} |
|
460 |
||
13087 | 461 |
void SymbolTable::dump(outputStream* st) { |
462 |
NumberSeq summary; |
|
463 |
for (int i = 0; i < the_table()->table_size(); ++i) { |
|
464 |
int count = 0; |
|
465 |
for (HashtableEntry<Symbol*>* e = the_table()->bucket(i); |
|
466 |
e != NULL; e = e->next()) { |
|
467 |
count++; |
|
468 |
} |
|
469 |
summary.add((double)count); |
|
470 |
} |
|
471 |
st->print_cr("SymbolTable statistics:"); |
|
472 |
st->print_cr("Number of buckets : %7d", summary.num()); |
|
473 |
st->print_cr("Average bucket size : %7.0f", summary.avg()); |
|
474 |
st->print_cr("Variance of bucket size : %7.0f", summary.variance()); |
|
475 |
st->print_cr("Std. dev. of bucket size: %7.0f", summary.sd()); |
|
476 |
st->print_cr("Maximum bucket size : %7.0f", summary.maximum()); |
|
477 |
} |
|
478 |
||
1 | 479 |
|
480 |
//--------------------------------------------------------------------------- |
|
481 |
// Non-product code |
|
482 |
||
483 |
#ifndef PRODUCT |
|
484 |
||
485 |
void SymbolTable::print_histogram() { |
|
486 |
MutexLocker ml(SymbolTable_lock); |
|
487 |
const int results_length = 100; |
|
488 |
int results[results_length]; |
|
489 |
int i,j; |
|
490 |
||
491 |
// initialize results to zero |
|
492 |
for (j = 0; j < results_length; j++) { |
|
493 |
results[j] = 0; |
|
494 |
} |
|
495 |
||
496 |
int total = 0; |
|
497 |
int max_symbols = 0; |
|
498 |
int out_of_range = 0; |
|
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|
499 |
int memory_total = 0; |
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|
500 |
int count = 0; |
1 | 501 |
for (i = 0; i < the_table()->table_size(); i++) { |
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|
502 |
HashtableEntry<Symbol*>* p = the_table()->bucket(i); |
1 | 503 |
for ( ; p != NULL; p = p->next()) { |
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|
504 |
memory_total += p->literal()->object_size(); |
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|
505 |
count++; |
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|
506 |
int counter = p->literal()->utf8_length(); |
1 | 507 |
total += counter; |
508 |
if (counter < results_length) { |
|
509 |
results[counter]++; |
|
510 |
} else { |
|
511 |
out_of_range++; |
|
512 |
} |
|
513 |
max_symbols = MAX2(max_symbols, counter); |
|
514 |
} |
|
515 |
} |
|
516 |
tty->print_cr("Symbol Table:"); |
|
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|
517 |
tty->print_cr("Total number of symbols %5d", count); |
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|
518 |
tty->print_cr("Total size in memory %5dK", |
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|
519 |
(memory_total*HeapWordSize)/1024); |
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|
520 |
tty->print_cr("Total counted %5d", symbols_counted); |
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|
521 |
tty->print_cr("Total removed %5d", symbols_removed); |
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|
522 |
if (symbols_counted > 0) { |
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|
523 |
tty->print_cr("Percent removed %3.2f", |
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|
524 |
((float)symbols_removed/(float)symbols_counted)* 100); |
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|
525 |
} |
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|
526 |
tty->print_cr("Reference counts %5d", Symbol::_total_count); |
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|
527 |
tty->print_cr("Symbol arena size %5d used %5d", |
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|
528 |
arena()->size_in_bytes(), arena()->used()); |
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|
529 |
tty->print_cr("Histogram of symbol length:"); |
1 | 530 |
tty->print_cr("%8s %5d", "Total ", total); |
531 |
tty->print_cr("%8s %5d", "Maximum", max_symbols); |
|
532 |
tty->print_cr("%8s %3.2f", "Average", |
|
533 |
((float) total / (float) the_table()->table_size())); |
|
534 |
tty->print_cr("%s", "Histogram:"); |
|
535 |
tty->print_cr(" %s %29s", "Length", "Number chains that length"); |
|
536 |
for (i = 0; i < results_length; i++) { |
|
537 |
if (results[i] > 0) { |
|
538 |
tty->print_cr("%6d %10d", i, results[i]); |
|
539 |
} |
|
540 |
} |
|
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|
541 |
if (Verbose) { |
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changeset
|
542 |
int line_length = 70; |
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|
543 |
tty->print_cr("%s %30s", " Length", "Number chains that length"); |
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|
544 |
for (i = 0; i < results_length; i++) { |
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|
545 |
if (results[i] > 0) { |
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|
546 |
tty->print("%4d", i); |
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changeset
|
547 |
for (j = 0; (j < results[i]) && (j < line_length); j++) { |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
548 |
tty->print("%1s", "*"); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
549 |
} |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
550 |
if (j == line_length) { |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
551 |
tty->print("%1s", "+"); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
552 |
} |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
553 |
tty->cr(); |
1 | 554 |
} |
8076
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
555 |
} |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
556 |
} |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
557 |
tty->print_cr(" %s %d: %d\n", "Number chains longer than", |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
558 |
results_length, out_of_range); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
559 |
} |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
560 |
|
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
561 |
void SymbolTable::print() { |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
562 |
for (int i = 0; i < the_table()->table_size(); ++i) { |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
563 |
HashtableEntry<Symbol*>** p = the_table()->bucket_addr(i); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
564 |
HashtableEntry<Symbol*>* entry = the_table()->bucket(i); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
565 |
if (entry != NULL) { |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
566 |
while (entry != NULL) { |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
567 |
tty->print(PTR_FORMAT " ", entry->literal()); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
568 |
entry->literal()->print(); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
569 |
tty->print(" %d", entry->literal()->refcount()); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
570 |
p = entry->next_addr(); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
571 |
entry = (HashtableEntry<Symbol*>*)HashtableEntry<Symbol*>::make_ptr(*p); |
1 | 572 |
} |
573 |
tty->cr(); |
|
574 |
} |
|
575 |
} |
|
576 |
} |
|
577 |
#endif // PRODUCT |
|
578 |
||
579 |
// -------------------------------------------------------------------------- |
|
580 |
||
581 |
#ifdef ASSERT |
|
582 |
class StableMemoryChecker : public StackObj { |
|
583 |
enum { _bufsize = wordSize*4 }; |
|
584 |
||
585 |
address _region; |
|
586 |
jint _size; |
|
587 |
u1 _save_buf[_bufsize]; |
|
588 |
||
589 |
int sample(u1* save_buf) { |
|
590 |
if (_size <= _bufsize) { |
|
591 |
memcpy(save_buf, _region, _size); |
|
592 |
return _size; |
|
593 |
} else { |
|
594 |
// copy head and tail |
|
595 |
memcpy(&save_buf[0], _region, _bufsize/2); |
|
596 |
memcpy(&save_buf[_bufsize/2], _region + _size - _bufsize/2, _bufsize/2); |
|
597 |
return (_bufsize/2)*2; |
|
598 |
} |
|
599 |
} |
|
600 |
||
601 |
public: |
|
602 |
StableMemoryChecker(const void* region, jint size) { |
|
603 |
_region = (address) region; |
|
604 |
_size = size; |
|
605 |
sample(_save_buf); |
|
606 |
} |
|
607 |
||
608 |
bool verify() { |
|
609 |
u1 check_buf[sizeof(_save_buf)]; |
|
610 |
int check_size = sample(check_buf); |
|
611 |
return (0 == memcmp(_save_buf, check_buf, check_size)); |
|
612 |
} |
|
613 |
||
614 |
void set_region(const void* region) { _region = (address) region; } |
|
615 |
}; |
|
616 |
#endif |
|
617 |
||
618 |
||
619 |
// -------------------------------------------------------------------------- |
|
620 |
StringTable* StringTable::_the_table = NULL; |
|
621 |
||
13087 | 622 |
bool StringTable::_needs_rehashing = false; |
623 |
jint StringTable::_seed = 0; |
|
624 |
||
625 |
// Pick hashing algorithm |
|
13097
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
626 |
unsigned int StringTable::hash_string(const jchar* s, int len) { |
13087 | 627 |
return use_alternate_hashcode() ? AltHashing::murmur3_32(seed(), s, len) : |
13097
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
628 |
java_lang_String::to_hash(s, len); |
13087 | 629 |
} |
630 |
||
1 | 631 |
oop StringTable::lookup(int index, jchar* name, |
632 |
int len, unsigned int hash) { |
|
13087 | 633 |
int count = 0; |
8076
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
634 |
for (HashtableEntry<oop>* l = bucket(index); l != NULL; l = l->next()) { |
13087 | 635 |
count++; |
1 | 636 |
if (l->hash() == hash) { |
637 |
if (java_lang_String::equals(l->literal(), name, len)) { |
|
638 |
return l->literal(); |
|
639 |
} |
|
640 |
} |
|
641 |
} |
|
13087 | 642 |
// If the bucket size is too deep check if this hash code is insufficient. |
643 |
if (count >= BasicHashtable::rehash_count && !needs_rehashing()) { |
|
644 |
_needs_rehashing = check_rehash_table(count); |
|
645 |
} |
|
1 | 646 |
return NULL; |
647 |
} |
|
648 |
||
649 |
||
13097
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
650 |
oop StringTable::basic_add(int index_arg, Handle string, jchar* name, |
13087 | 651 |
int len, unsigned int hashValue_arg, TRAPS) { |
1 | 652 |
|
653 |
assert(java_lang_String::equals(string(), name, len), |
|
654 |
"string must be properly initialized"); |
|
13097
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
655 |
// Cannot hit a safepoint in this function because the "this" pointer can move. |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
656 |
No_Safepoint_Verifier nsv; |
1 | 657 |
|
13087 | 658 |
// Check if the symbol table has been rehashed, if so, need to recalculate |
13097
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
659 |
// the hash value and index before second lookup. |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
660 |
unsigned int hashValue; |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
661 |
int index; |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
662 |
if (use_alternate_hashcode()) { |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
663 |
hashValue = hash_string(name, len); |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
664 |
index = hash_to_index(hashValue); |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
665 |
} else { |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
666 |
hashValue = hashValue_arg; |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
667 |
index = index_arg; |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
668 |
} |
13087 | 669 |
|
1 | 670 |
// Since look-up was done lock-free, we need to check if another |
671 |
// thread beat us in the race to insert the symbol. |
|
672 |
||
673 |
oop test = lookup(index, name, len, hashValue); // calls lookup(u1*, int) |
|
674 |
if (test != NULL) { |
|
675 |
// Entry already added |
|
676 |
return test; |
|
677 |
} |
|
678 |
||
8076
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
679 |
HashtableEntry<oop>* entry = new_entry(hashValue, string()); |
1 | 680 |
add_entry(index, entry); |
681 |
return string(); |
|
682 |
} |
|
683 |
||
684 |
||
8076
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
685 |
oop StringTable::lookup(Symbol* symbol) { |
1 | 686 |
ResourceMark rm; |
687 |
int length; |
|
688 |
jchar* chars = symbol->as_unicode(length); |
|
13087 | 689 |
unsigned int hashValue = hash_string(chars, length); |
1 | 690 |
int index = the_table()->hash_to_index(hashValue); |
691 |
return the_table()->lookup(index, chars, length, hashValue); |
|
692 |
} |
|
693 |
||
694 |
||
695 |
oop StringTable::intern(Handle string_or_null, jchar* name, |
|
696 |
int len, TRAPS) { |
|
13087 | 697 |
unsigned int hashValue = hash_string(name, len); |
1 | 698 |
int index = the_table()->hash_to_index(hashValue); |
13097
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
699 |
oop found_string = the_table()->lookup(index, name, len, hashValue); |
1 | 700 |
|
701 |
// Found |
|
13097
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
702 |
if (found_string != NULL) return found_string; |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
703 |
|
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
704 |
debug_only(StableMemoryChecker smc(name, len * sizeof(name[0]))); |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
705 |
assert(!Universe::heap()->is_in_reserved(name) || GC_locker::is_active(), |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
706 |
"proposed name of symbol must be stable"); |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
707 |
|
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
708 |
Handle string; |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
709 |
// try to reuse the string if possible |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
710 |
if (!string_or_null.is_null() && (!JavaObjectsInPerm || string_or_null()->is_perm())) { |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
711 |
string = string_or_null; |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
712 |
} else { |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
713 |
string = java_lang_String::create_tenured_from_unicode(name, len, CHECK_NULL); |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
714 |
} |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
715 |
|
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
716 |
// Grab the StringTable_lock before getting the_table() because it could |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
717 |
// change at safepoint. |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
718 |
MutexLocker ml(StringTable_lock, THREAD); |
1 | 719 |
|
720 |
// Otherwise, add to symbol to table |
|
13097
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
721 |
return the_table()->basic_add(index, string, name, len, |
1 | 722 |
hashValue, CHECK_NULL); |
723 |
} |
|
724 |
||
8076
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
725 |
oop StringTable::intern(Symbol* symbol, TRAPS) { |
1 | 726 |
if (symbol == NULL) return NULL; |
727 |
ResourceMark rm(THREAD); |
|
728 |
int length; |
|
729 |
jchar* chars = symbol->as_unicode(length); |
|
730 |
Handle string; |
|
731 |
oop result = intern(string, chars, length, CHECK_NULL); |
|
732 |
return result; |
|
733 |
} |
|
734 |
||
735 |
||
736 |
oop StringTable::intern(oop string, TRAPS) |
|
737 |
{ |
|
738 |
if (string == NULL) return NULL; |
|
739 |
ResourceMark rm(THREAD); |
|
740 |
int length; |
|
741 |
Handle h_string (THREAD, string); |
|
742 |
jchar* chars = java_lang_String::as_unicode_string(string, length); |
|
743 |
oop result = intern(h_string, chars, length, CHECK_NULL); |
|
744 |
return result; |
|
745 |
} |
|
746 |
||
747 |
||
748 |
oop StringTable::intern(const char* utf8_string, TRAPS) { |
|
749 |
if (utf8_string == NULL) return NULL; |
|
750 |
ResourceMark rm(THREAD); |
|
751 |
int length = UTF8::unicode_length(utf8_string); |
|
752 |
jchar* chars = NEW_RESOURCE_ARRAY(jchar, length); |
|
753 |
UTF8::convert_to_unicode(utf8_string, chars, length); |
|
754 |
Handle string; |
|
755 |
oop result = intern(string, chars, length, CHECK_NULL); |
|
756 |
return result; |
|
757 |
} |
|
758 |
||
8076
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
759 |
void StringTable::unlink(BoolObjectClosure* is_alive) { |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
760 |
// Readers of the table are unlocked, so we should only be removing |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
761 |
// entries at a safepoint. |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
762 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
763 |
for (int i = 0; i < the_table()->table_size(); ++i) { |
13097
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
764 |
HashtableEntry<oop>** p = the_table()->bucket_addr(i); |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
765 |
HashtableEntry<oop>* entry = the_table()->bucket(i); |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
766 |
while (entry != NULL) { |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
767 |
// Shared entries are normally at the end of the bucket and if we run into |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
768 |
// a shared entry, then there is nothing more to remove. However, if we |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
769 |
// have rehashed the table, then the shared entries are no longer at the |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
770 |
// end of the bucket. |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
771 |
if (entry->is_shared() && !use_alternate_hashcode()) { |
8076
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
772 |
break; |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
773 |
} |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
774 |
assert(entry->literal() != NULL, "just checking"); |
13097
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
775 |
if (entry->is_shared() || is_alive->do_object_b(entry->literal())) { |
8076
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
776 |
p = entry->next_addr(); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
777 |
} else { |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
778 |
*p = entry->next(); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
779 |
the_table()->free_entry(entry); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
780 |
} |
13097
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
781 |
entry = (HashtableEntry<oop>*)HashtableEntry<oop>::make_ptr(*p); |
8076
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
782 |
} |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
783 |
} |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
784 |
} |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
785 |
|
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
786 |
void StringTable::oops_do(OopClosure* f) { |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
787 |
for (int i = 0; i < the_table()->table_size(); ++i) { |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
788 |
HashtableEntry<oop>** p = the_table()->bucket_addr(i); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
789 |
HashtableEntry<oop>* entry = the_table()->bucket(i); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
790 |
while (entry != NULL) { |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
791 |
f->do_oop((oop*)entry->literal_addr()); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
792 |
|
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
793 |
// Did the closure remove the literal from the table? |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
794 |
if (entry->literal() == NULL) { |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
795 |
assert(!entry->is_shared(), "immutable hashtable entry?"); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
796 |
*p = entry->next(); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
797 |
the_table()->free_entry(entry); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
798 |
} else { |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
799 |
p = entry->next_addr(); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
800 |
} |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
801 |
entry = (HashtableEntry<oop>*)HashtableEntry<oop>::make_ptr(*p); |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
802 |
} |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
803 |
} |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
804 |
} |
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
805 |
|
1 | 806 |
void StringTable::verify() { |
807 |
for (int i = 0; i < the_table()->table_size(); ++i) { |
|
8076
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
808 |
HashtableEntry<oop>* p = the_table()->bucket(i); |
1 | 809 |
for ( ; p != NULL; p = p->next()) { |
810 |
oop s = p->literal(); |
|
811 |
guarantee(s != NULL, "interned string is NULL"); |
|
8728
3f1bcd33068e
6962931: move interned strings out of the perm gen
jcoomes
parents:
8655
diff
changeset
|
812 |
guarantee(s->is_perm() || !JavaObjectsInPerm, "interned string not in permspace"); |
8885
eed0ba1d011b
7032129: Native memory usage grow unexpectedly for vm/oom/*InternedString tests
never
parents:
8728
diff
changeset
|
813 |
unsigned int h = java_lang_String::hash_string(s); |
1 | 814 |
guarantee(p->hash() == h, "broken hash in string table entry"); |
815 |
guarantee(the_table()->hash_to_index(h) == i, |
|
816 |
"wrong index in string table"); |
|
817 |
} |
|
818 |
} |
|
819 |
} |
|
13087 | 820 |
|
821 |
void StringTable::dump(outputStream* st) { |
|
822 |
NumberSeq summary; |
|
823 |
for (int i = 0; i < the_table()->table_size(); ++i) { |
|
824 |
HashtableEntry<oop>* p = the_table()->bucket(i); |
|
825 |
int count = 0; |
|
826 |
for ( ; p != NULL; p = p->next()) { |
|
827 |
count++; |
|
828 |
} |
|
829 |
summary.add((double)count); |
|
830 |
} |
|
831 |
st->print_cr("StringTable statistics:"); |
|
832 |
st->print_cr("Number of buckets : %7d", summary.num()); |
|
833 |
st->print_cr("Average bucket size : %7.0f", summary.avg()); |
|
834 |
st->print_cr("Variance of bucket size : %7.0f", summary.variance()); |
|
835 |
st->print_cr("Std. dev. of bucket size: %7.0f", summary.sd()); |
|
836 |
st->print_cr("Maximum bucket size : %7.0f", summary.maximum()); |
|
837 |
} |
|
838 |
||
839 |
||
840 |
unsigned int StringTable::new_hash(oop string) { |
|
841 |
ResourceMark rm; |
|
842 |
int length; |
|
843 |
jchar* chars = java_lang_String::as_unicode_string(string, length); |
|
844 |
// Use alternate hashing algorithm on the string |
|
845 |
return AltHashing::murmur3_32(seed(), chars, length); |
|
846 |
} |
|
847 |
||
848 |
// Create a new table and using alternate hash code, populate the new table |
|
849 |
// with the existing strings. Set flag to use the alternate hash code afterwards. |
|
850 |
void StringTable::rehash_table() { |
|
851 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
|
13097
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
852 |
// This should never happen with -Xshare:dump but it might in testing mode. |
c146b608d91f
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
coleenp
parents:
13087
diff
changeset
|
853 |
if (DumpSharedSpaces) return; |
13087 | 854 |
StringTable* new_table = new StringTable(); |
855 |
||
856 |
// Initialize new global seed for hashing. |
|
857 |
_seed = AltHashing::compute_seed(); |
|
858 |
assert(seed() != 0, "shouldn't be zero"); |
|
859 |
||
860 |
// Rehash the table |
|
861 |
the_table()->move_to(new_table); |
|
862 |
||
863 |
// Delete the table and buckets (entries are reused in new table). |
|
864 |
delete _the_table; |
|
865 |
// Don't check if we need rehashing until the table gets unbalanced again. |
|
866 |
// Then rehash with a new global seed. |
|
867 |
_needs_rehashing = false; |
|
868 |
_the_table = new_table; |
|
869 |
} |