Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "classfile/symbolTable.hpp"

 #include "memory/gcLocker.hpp"

 #include "oops/oop.inline.hpp"

 #include "oops/symbolKlass.hpp"

 #include "oops/symbolOop.hpp"

 #include "runtime/handles.inline.hpp"

 symbolOop symbolKlass::allocate_symbol(u1* name, int len, TRAPS) {

   // Don't allow symbol oops to be created which cannot fit in a symbolOop.

   if (len > symbolOopDesc::max_length()) {

     THROW_MSG_0(vmSymbols::java_lang_InternalError(),

                 "name is too long to represent");

   }

   int size = symbolOopDesc::object_size(len);

   symbolKlassHandle h_k(THREAD, as_klassOop());

   symbolOop sym = (symbolOop)

     CollectedHeap::permanent_obj_allocate(h_k, size, CHECK_NULL);

   assert(!sym->is_parsable(), "not expecting parsability yet.");

   No_Safepoint_Verifier no_safepoint;

   sym->set_utf8_length(len);

   for (int i = 0; i < len; i++) {

     sym->byte_at_put(i, name[i]);

   }

   // Let the first emptySymbol be created and

   // ensure only one is ever created.

   assert(sym->is_parsable() || Universe::emptySymbol() == NULL,

          "should be parsable here.");

   return sym;

 }

 bool symbolKlass::allocate_symbols(int names_count, const char** names,

                                    int* lengths, symbolOop* sym_oops, TRAPS) {

   if (UseConcMarkSweepGC || UseParallelGC) {

     // Concurrent GC needs to mark all the allocated symbol oops after

     // the remark phase which isn't done below (except the first symbol oop).

     // So return false which will let the symbols be allocated one by one.

     // The parallel collector uses an object start array to find the

     // start of objects on a dirty card.  The object start array is not

     // updated for the start of each symbol so is not precise.  During

     // object array verification this causes a verification failure.

     // In a product build this causes extra searching for the start of

     // a symbol.  As with the concurrent collector a return of false will

     // cause each symbol to be allocated separately and in the case

     // of the parallel collector will cause the object

     // start array to be updated.

     return false;

   }

   assert(names_count > 0, "can't allocate 0 symbols");

   int total_size = 0;

   int i, sizes[SymbolTable::symbol_alloc_batch_size];

   for (i=0; i<names_count; i++) {

     int len = lengths[i];

     if (len > symbolOopDesc::max_length()) {

       return false;

     }

     int sz = symbolOopDesc::object_size(len);

     sizes[i] = sz * HeapWordSize;

     total_size += sz;

   }

   symbolKlassHandle h_k(THREAD, as_klassOop());

   HeapWord* base = Universe::heap()->permanent_mem_allocate(total_size);

   if (base == NULL) {

     return false;

   }

   // CAN'T take any safepoint during the initialization of the symbol oops !

   No_Safepoint_Verifier nosafepoint;

   klassOop sk = h_k();

   int pos = 0;

   for (i=0; i<names_count; i++) {

     symbolOop s = (symbolOop) (((char*)base) + pos);

     s->set_mark(markOopDesc::prototype());

     s->set_klass(sk);

     s->set_utf8_length(lengths[i]);

     const char* name = names[i];

     for (int j=0; j<lengths[i]; j++) {

       s->byte_at_put(j, name[j]);

     }

     assert(s->is_parsable(), "should be parsable here.");

     sym_oops[i] = s;

     pos += sizes[i];

   }

   return true;

 }

 klassOop symbolKlass::create_klass(TRAPS) {

   symbolKlass o;

   KlassHandle h_this_klass(THREAD, Universe::klassKlassObj());

   KlassHandle k = base_create_klass(h_this_klass, header_size(), o.vtbl_value(), CHECK_NULL);

   // Make sure size calculation is right

   assert(k()->size() == align_object_size(header_size()), "wrong size for object");

 //  java_lang_Class::create_mirror(k, CHECK_NULL); // Allocate mirror

   return k();

 }

 int symbolKlass::oop_size(oop obj) const {

   assert(obj->is_symbol(),"must be a symbol");

   symbolOop s = symbolOop(obj);

   int size = s->object_size();

   return size;

 }

 bool symbolKlass::oop_is_parsable(oop obj) const {

   assert(obj->is_symbol(),"must be a symbol");

   symbolOop s = symbolOop(obj);

   return s->object_is_parsable();

 }

 void symbolKlass::oop_follow_contents(oop obj) {

   assert (obj->is_symbol(), "object must be symbol");

   // Performance tweak: We skip iterating over the klass pointer since we

   // know that Universe::symbolKlassObj never moves.

   // Note: do not follow next link here (see SymbolTable::follow_contents)

 }

 #ifndef SERIALGC

 void symbolKlass::oop_follow_contents(ParCompactionManager* cm, oop obj) {

   assert (obj->is_symbol(), "object must be symbol");

   // Performance tweak: We skip iterating over the klass pointer since we

   // know that Universe::symbolKlassObj never moves.

   // Note: do not follow next link here (see SymbolTable::follow_contents)

 }

 #endif // SERIALGC

 int symbolKlass::oop_oop_iterate(oop obj, OopClosure* blk) {

   assert(obj->is_symbol(), "object must be symbol");

   symbolOop s = symbolOop(obj);

   // Get size before changing pointers.

   // Don't call size() or oop_size() since that is a virtual call.

   int size = s->object_size();

   // Performance tweak: We skip iterating over the klass pointer since we

   // know that Universe::symbolKlassObj never moves.

   return size;

 }

 int symbolKlass::oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {

   assert(obj->is_symbol(), "object must be symbol");

   symbolOop s = symbolOop(obj);

   // Get size before changing pointers.

   // Don't call size() or oop_size() since that is a virtual call.

   int size = s->object_size();

   // Performance tweak: We skip iterating over the klass pointer since we

   // know that Universe::symbolKlassObj never moves.

   return size;

 }

 int symbolKlass::oop_adjust_pointers(oop obj) {

   assert(obj->is_symbol(), "should be symbol");

   symbolOop s = symbolOop(obj);

   // Get size before changing pointers.

   // Don't call size() or oop_size() since that is a virtual call.

   int size = s->object_size();

   // Performance tweak: We skip iterating over the klass pointer since we

   // know that Universe::symbolKlassObj never moves.

   return size;

 }

 #ifndef SERIALGC

 void symbolKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {

   assert(obj->is_symbol(), "should be symbol");

 }

 int symbolKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {

   assert(obj->is_symbol(), "should be symbol");

   return symbolOop(obj)->object_size();

 }

 int symbolKlass::oop_update_pointers(ParCompactionManager* cm, oop obj,

                                      HeapWord* beg_addr, HeapWord* end_addr) {

   assert(obj->is_symbol(), "should be symbol");

   return symbolOop(obj)->object_size();

 }

 #endif // SERIALGC

 #ifndef PRODUCT

 // Printing

 void symbolKlass::oop_print_on(oop obj, outputStream* st) {

   st->print("Symbol: '");

   symbolOop(obj)->print_symbol_on(st);

   st->print("'");

 }

 #endif //PRODUCT

 void symbolKlass::oop_print_value_on(oop obj, outputStream* st) {

   symbolOop sym = symbolOop(obj);

   st->print("'");

   for (int i = 0; i < sym->utf8_length(); i++) {

     st->print("%c", sym->byte_at(i));

   }

   st->print("'");

 }

 const char* symbolKlass::internal_name() const {

   return "{symbol}";

 }