author | coleenp |
Thu, 14 Jan 2016 16:26:38 -0500 | |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_CLASSFILE_SYMBOLTABLE_HPP |
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#define SHARE_VM_CLASSFILE_SYMBOLTABLE_HPP |
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#include "memory/allocation.inline.hpp" |
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#include "oops/symbol.hpp" |
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#include "utilities/hashtable.hpp" |
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// The symbol table holds all Symbol*s and corresponding interned strings. |
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// Symbol*s and literal strings should be canonicalized. |
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// |
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// The interned strings are created lazily. |
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// |
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// It is implemented as an open hash table with a fixed number of buckets. |
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// |
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// %note: |
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// - symbolTableEntrys are allocated in blocks to reduce the space overhead. |
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class BoolObjectClosure; |
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class outputStream; |
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// Class to hold a newly created or referenced Symbol* temporarily in scope. |
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// new_symbol() and lookup() will create a Symbol* if not already in the |
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// symbol table and add to the symbol's reference count. |
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// probe() and lookup_only() will increment the refcount if symbol is found. |
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class TempNewSymbol : public StackObj { |
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Symbol* _temp; |
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public: |
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TempNewSymbol() : _temp(NULL) {} |
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// Creating or looking up a symbol increments the symbol's reference count |
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TempNewSymbol(Symbol *s) : _temp(s) {} |
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// Operator= increments reference count. |
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void operator=(const TempNewSymbol &s) { |
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//clear(); //FIXME |
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_temp = s._temp; |
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if (_temp !=NULL) _temp->increment_refcount(); |
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} |
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// Decrement reference counter so it can go away if it's unique |
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void clear() { if (_temp != NULL) _temp->decrement_refcount(); _temp = NULL; } |
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~TempNewSymbol() { clear(); } |
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// Operators so they can be used like Symbols |
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Symbol* operator -> () const { return _temp; } |
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bool operator == (Symbol* o) const { return _temp == o; } |
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// Sneaky conversion function |
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operator Symbol*() { return _temp; } |
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}; |
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template <class T, class N> class CompactHashtable; |
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class SymbolTable : public RehashableHashtable<Symbol*, mtSymbol> { |
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friend class VMStructs; |
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friend class ClassFileParser; |
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private: |
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// The symbol table |
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static SymbolTable* _the_table; |
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// Set if one bucket is out of balance due to hash algorithm deficiency |
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static bool _needs_rehashing; |
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static bool _lookup_shared_first; |
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// For statistics |
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static int _symbols_removed; |
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static int _symbols_counted; |
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// shared symbol table. |
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static CompactHashtable<Symbol*, char> _shared_table; |
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Symbol* allocate_symbol(const u1* name, int len, bool c_heap, TRAPS); // Assumes no characters larger than 0x7F |
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// Adding elements |
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Symbol* basic_add(int index, u1* name, int len, unsigned int hashValue, |
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bool c_heap, TRAPS); |
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bool basic_add(ClassLoaderData* loader_data, |
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const constantPoolHandle& cp, int names_count, |
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const char** names, int* lengths, int* cp_indices, |
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unsigned int* hashValues, TRAPS); |
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static void new_symbols(ClassLoaderData* loader_data, |
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const constantPoolHandle& cp, int names_count, |
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const char** name, int* lengths, |
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int* cp_indices, unsigned int* hashValues, |
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TRAPS) { |
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add(loader_data, cp, names_count, name, lengths, cp_indices, hashValues, THREAD); |
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} |
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static Symbol* lookup_shared(const char* name, int len, unsigned int hash); |
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Symbol* lookup_dynamic(int index, const char* name, int len, unsigned int hash); |
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Symbol* lookup(int index, const char* name, int len, unsigned int hash); |
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SymbolTable() |
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: RehashableHashtable<Symbol*, mtSymbol>(SymbolTableSize, sizeof (HashtableEntry<Symbol*, mtSymbol>)) {} |
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SymbolTable(HashtableBucket<mtSymbol>* t, int number_of_entries) |
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: RehashableHashtable<Symbol*, mtSymbol>(SymbolTableSize, sizeof (HashtableEntry<Symbol*, mtSymbol>), t, |
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number_of_entries) {} |
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// Arena for permanent symbols (null class loader) that are never unloaded |
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static Arena* _arena; |
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static Arena* arena() { return _arena; } // called for statistics |
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static void initialize_symbols(int arena_alloc_size = 0); |
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static volatile int _parallel_claimed_idx; |
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// Release any dead symbols |
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static void buckets_unlink(int start_idx, int end_idx, int* processed, int* removed); |
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enum { |
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symbol_alloc_batch_size = 8, |
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// Pick initial size based on java -version size measurements |
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symbol_alloc_arena_size = 360*K |
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}; |
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// The symbol table |
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static SymbolTable* the_table() { return _the_table; } |
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// Size of one bucket in the string table. Used when checking for rollover. |
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static uint bucket_size() { return sizeof(HashtableBucket<mtSymbol>); } |
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static void create_table() { |
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assert(_the_table == NULL, "One symbol table allowed."); |
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_the_table = new SymbolTable(); |
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initialize_symbols(symbol_alloc_arena_size); |
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} |
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static unsigned int hash_symbol(const char* s, int len); |
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static Symbol* lookup(const char* name, int len, TRAPS); |
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// lookup only, won't add. Also calculate hash. |
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static Symbol* lookup_only(const char* name, int len, unsigned int& hash); |
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// Only copy to C string to be added if lookup failed. |
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static Symbol* lookup(const Symbol* sym, int begin, int end, TRAPS); |
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static void release(Symbol* sym); |
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// Look up the address of the literal in the SymbolTable for this Symbol* |
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static Symbol** lookup_symbol_addr(Symbol* sym); |
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// jchar (UTF16) version of lookups |
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static Symbol* lookup_unicode(const jchar* name, int len, TRAPS); |
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static Symbol* lookup_only_unicode(const jchar* name, int len, unsigned int& hash); |
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static void add(ClassLoaderData* loader_data, |
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const constantPoolHandle& cp, int names_count, |
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const char** names, int* lengths, int* cp_indices, |
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unsigned int* hashValues, TRAPS); |
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// Release any dead symbols |
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static void unlink() { |
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int processed = 0; |
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int removed = 0; |
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unlink(&processed, &removed); |
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} |
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static void unlink(int* processed, int* removed); |
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// Release any dead symbols, possibly parallel version |
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static void possibly_parallel_unlink(int* processed, int* removed); |
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|
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// iterate over symbols |
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static void symbols_do(SymbolClosure *cl); |
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// Symbol creation |
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static Symbol* new_symbol(const char* utf8_buffer, int length, TRAPS) { |
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assert(utf8_buffer != NULL, "just checking"); |
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return lookup(utf8_buffer, length, THREAD); |
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} |
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static Symbol* new_symbol(const char* name, TRAPS) { |
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return new_symbol(name, (int)strlen(name), THREAD); |
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} |
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static Symbol* new_symbol(const Symbol* sym, int begin, int end, TRAPS) { |
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assert(begin <= end && end <= sym->utf8_length(), "just checking"); |
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return lookup(sym, begin, end, THREAD); |
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} |
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// Create a symbol in the arena for symbols that are not deleted |
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static Symbol* new_permanent_symbol(const char* name, TRAPS); |
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// Symbol lookup |
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static Symbol* lookup(int index, const char* name, int len, TRAPS); |
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// Needed for preloading classes in signatures when compiling. |
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// Returns the symbol is already present in symbol table, otherwise |
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// NULL. NO ALLOCATION IS GUARANTEED! |
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static Symbol* probe(const char* name, int len) { |
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unsigned int ignore_hash; |
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return lookup_only(name, len, ignore_hash); |
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} |
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static Symbol* probe_unicode(const jchar* name, int len) { |
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unsigned int ignore_hash; |
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return lookup_only_unicode(name, len, ignore_hash); |
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} |
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// Histogram |
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static void print_histogram() PRODUCT_RETURN; |
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static void print() PRODUCT_RETURN; |
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// Debugging |
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static void verify(); |
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static void dump(outputStream* st, bool verbose=false); |
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static void read(const char* filename, TRAPS); |
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// Sharing |
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static bool copy_compact_table(char** top, char* end); |
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static const char* init_shared_table(const char* buffer); |
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// Rehash the symbol table if it gets out of balance |
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static void rehash_table(); |
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static bool needs_rehashing() { return _needs_rehashing; } |
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// Parallel chunked scanning |
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static void clear_parallel_claimed_index() { _parallel_claimed_idx = 0; } |
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static int parallel_claimed_index() { return _parallel_claimed_idx; } |
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}; |
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#endif // SHARE_VM_CLASSFILE_SYMBOLTABLE_HPP |