duke@435: /*
duke@435:  * Copyright 1997-2006 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: # include "incls/_precompiled.incl"
duke@435: # include "incls/_symbolKlass.cpp.incl"
duke@435: 
duke@435: symbolOop symbolKlass::allocate_symbol(u1* name, int len, TRAPS) {
duke@435:   // Don't allow symbol oops to be created which cannot fit in a symbolOop.
duke@435:   if (len > symbolOopDesc::max_length()) {
duke@435:     THROW_MSG_0(vmSymbols::java_lang_InternalError(),
duke@435:                 "name is too long to represent");
duke@435:   }
duke@435:   int size = symbolOopDesc::object_size(len);
duke@435:   symbolKlassHandle h_k(THREAD, as_klassOop());
duke@435:   symbolOop sym = (symbolOop)
duke@435:     CollectedHeap::permanent_obj_allocate(h_k, size, CHECK_NULL);
duke@435:   assert(!sym->is_parsable(), "not expecting parsability yet.");
duke@435:   No_Safepoint_Verifier no_safepoint;
duke@435:   sym->set_utf8_length(len);
duke@435:   for (int i = 0; i < len; i++) {
duke@435:     sym->byte_at_put(i, name[i]);
duke@435:   }
duke@435:   // Let the first emptySymbol be created and
duke@435:   // ensure only one is ever created.
duke@435:   assert(sym->is_parsable() || Universe::emptySymbol() == NULL,
duke@435:          "should be parsable here.");
duke@435:   return sym;
duke@435: }
duke@435: 
duke@435: bool symbolKlass::allocate_symbols(int names_count, const char** names,
duke@435:                                    int* lengths, symbolOop* sym_oops, TRAPS) {
duke@435:   if (UseConcMarkSweepGC || UseParallelGC) {
duke@435:     // Concurrent GC needs to mark all the allocated symbol oops after
duke@435:     // the remark phase which isn't done below (except the first symbol oop).
duke@435:     // So return false which will let the symbols be allocated one by one.
duke@435:     // The parallel collector uses an object start array to find the
duke@435:     // start of objects on a dirty card.  The object start array is not
duke@435:     // updated for the start of each symbol so is not precise.  During
duke@435:     // object array verification this causes a verification failure.
duke@435:     // In a product build this causes extra searching for the start of
duke@435:     // a symbol.  As with the concurrent collector a return of false will
duke@435:     // cause each symbol to be allocated separately and in the case
duke@435:     // of the parallel collector will cause the object
duke@435:     // start array to be updated.
duke@435:     return false;
duke@435:   }
duke@435: 
duke@435:   assert(names_count > 0, "can't allocate 0 symbols");
duke@435: 
duke@435:   int total_size = 0;
duke@435:   int i, sizes[SymbolTable::symbol_alloc_batch_size];
duke@435:   for (i=0; i<names_count; i++) {
duke@435:     int len = lengths[i];
duke@435:     if (len > symbolOopDesc::max_length()) {
duke@435:       return false;
duke@435:     }
duke@435:     int sz = symbolOopDesc::object_size(len);
duke@435:     sizes[i] = sz * HeapWordSize;
duke@435:     total_size += sz;
duke@435:   }
duke@435:   symbolKlassHandle h_k(THREAD, as_klassOop());
duke@435:   HeapWord* base = Universe::heap()->permanent_mem_allocate(total_size);
duke@435:   if (base == NULL) {
duke@435:     return false;
duke@435:   }
duke@435: 
duke@435:   // CAN'T take any safepoint during the initialization of the symbol oops !
duke@435:   No_Safepoint_Verifier nosafepoint;
duke@435: 
duke@435:   klassOop sk = h_k();
duke@435:   int pos = 0;
duke@435:   for (i=0; i<names_count; i++) {
duke@435:     symbolOop s = (symbolOop) (((char*)base) + pos);
duke@435:     s->set_mark(markOopDesc::prototype());
duke@435:     s->set_klass(sk);
duke@435:     s->set_utf8_length(lengths[i]);
duke@435:     const char* name = names[i];
duke@435:     for (int j=0; j<lengths[i]; j++) {
duke@435:       s->byte_at_put(j, name[j]);
duke@435:     }
duke@435: 
duke@435:     assert(s->is_parsable(), "should be parsable here.");
duke@435: 
duke@435:     sym_oops[i] = s;
duke@435:     pos += sizes[i];
duke@435:   }
duke@435:   return true;
duke@435: }
duke@435: 
duke@435: klassOop symbolKlass::create_klass(TRAPS) {
duke@435:   symbolKlass o;
duke@435:   KlassHandle h_this_klass(THREAD, Universe::klassKlassObj());
duke@435:   KlassHandle k = base_create_klass(h_this_klass, header_size(), o.vtbl_value(), CHECK_NULL);
duke@435:   // Make sure size calculation is right
duke@435:   assert(k()->size() == align_object_size(header_size()), "wrong size for object");
duke@435: //  java_lang_Class::create_mirror(k, CHECK_NULL); // Allocate mirror
duke@435:   return k();
duke@435: }
duke@435: 
duke@435: int symbolKlass::oop_size(oop obj) const {
duke@435:   assert(obj->is_symbol(),"must be a symbol");
duke@435:   symbolOop s = symbolOop(obj);
duke@435:   int size = s->object_size();
duke@435:   return size;
duke@435: }
duke@435: 
duke@435: bool symbolKlass::oop_is_parsable(oop obj) const {
duke@435:   assert(obj->is_symbol(),"must be a symbol");
duke@435:   symbolOop s = symbolOop(obj);
duke@435:   return s->object_is_parsable();
duke@435: }
duke@435: 
duke@435: void symbolKlass::oop_follow_contents(oop obj) {
duke@435:   assert (obj->is_symbol(), "object must be symbol");
duke@435:   // Performance tweak: We skip iterating over the klass pointer since we
duke@435:   // know that Universe::symbolKlassObj never moves.
duke@435:   // Note: do not follow next link here (see SymbolTable::follow_contents)
duke@435: }
duke@435: 
duke@435: #ifndef SERIALGC
duke@435: void symbolKlass::oop_follow_contents(ParCompactionManager* cm, oop obj) {
duke@435:   assert (obj->is_symbol(), "object must be symbol");
duke@435:   // Performance tweak: We skip iterating over the klass pointer since we
duke@435:   // know that Universe::symbolKlassObj never moves.
duke@435:   // Note: do not follow next link here (see SymbolTable::follow_contents)
duke@435: }
duke@435: #endif // SERIALGC
duke@435: 
duke@435: int symbolKlass::oop_oop_iterate(oop obj, OopClosure* blk) {
duke@435:   assert(obj->is_symbol(), "object must be symbol");
duke@435:   symbolOop s = symbolOop(obj);
duke@435:   // Get size before changing pointers.
duke@435:   // Don't call size() or oop_size() since that is a virtual call.
duke@435:   int size = s->object_size();
duke@435:   // Performance tweak: We skip iterating over the klass pointer since we
duke@435:   // know that Universe::symbolKlassObj never moves.
duke@435:   return size;
duke@435: }
duke@435: 
duke@435: 
duke@435: int symbolKlass::oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
duke@435:   assert(obj->is_symbol(), "object must be symbol");
duke@435:   symbolOop s = symbolOop(obj);
duke@435:   // Get size before changing pointers.
duke@435:   // Don't call size() or oop_size() since that is a virtual call.
duke@435:   int size = s->object_size();
duke@435:   // Performance tweak: We skip iterating over the klass pointer since we
duke@435:   // know that Universe::symbolKlassObj never moves.
duke@435:   return size;
duke@435: }
duke@435: 
duke@435: 
duke@435: int symbolKlass::oop_adjust_pointers(oop obj) {
duke@435:   assert(obj->is_symbol(), "should be symbol");
duke@435:   symbolOop s = symbolOop(obj);
duke@435:   // Get size before changing pointers.
duke@435:   // Don't call size() or oop_size() since that is a virtual call.
duke@435:   int size = s->object_size();
duke@435:   // Performance tweak: We skip iterating over the klass pointer since we
duke@435:   // know that Universe::symbolKlassObj never moves.
duke@435:   return size;
duke@435: }
duke@435: 
duke@435: 
duke@435: #ifndef SERIALGC
duke@435: void symbolKlass::oop_copy_contents(PSPromotionManager* pm, oop obj) {
duke@435:   assert(obj->is_symbol(), "should be symbol");
duke@435: }
duke@435: 
duke@435: void symbolKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
duke@435:   assert(obj->is_symbol(), "should be symbol");
duke@435: }
duke@435: 
duke@435: int symbolKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
duke@435:   assert(obj->is_symbol(), "should be symbol");
duke@435:   return symbolOop(obj)->object_size();
duke@435: }
duke@435: 
duke@435: int symbolKlass::oop_update_pointers(ParCompactionManager* cm, oop obj,
duke@435:                                      HeapWord* beg_addr, HeapWord* end_addr) {
duke@435:   assert(obj->is_symbol(), "should be symbol");
duke@435:   return symbolOop(obj)->object_size();
duke@435: }
duke@435: #endif // SERIALGC
duke@435: 
duke@435: #ifndef PRODUCT
duke@435: // Printing
duke@435: 
duke@435: void symbolKlass::oop_print_on(oop obj, outputStream* st) {
duke@435:   st->print("Symbol: '");
never@657:   symbolOop(obj)->print_symbol_on(st);
duke@435:   st->print("'");
duke@435: }
duke@435: 
jrose@1590: #endif //PRODUCT
jrose@1590: 
duke@435: void symbolKlass::oop_print_value_on(oop obj, outputStream* st) {
duke@435:   symbolOop sym = symbolOop(obj);
duke@435:   st->print("'");
duke@435:   for (int i = 0; i < sym->utf8_length(); i++) {
duke@435:     st->print("%c", sym->byte_at(i));
duke@435:   }
duke@435:   st->print("'");
duke@435: }
duke@435: 
duke@435: const char* symbolKlass::internal_name() const {
duke@435:   return "{symbol}";
duke@435: }