jdk8-mips64-public/hotspot: src/share/vm/oops/typeArrayKlass.cpp@d4fca0a6abde (annotated)

src/share/vm/oops/typeArrayKlass.cpp@d4fca0a6abde (annotated)

src/share/vm/oops/typeArrayKlass.cpp

Tue, 11 Jan 2011 20:26:13 -0800

author: kvn
date: Tue, 11 Jan 2011 20:26:13 -0800
changeset 2439: d4fca0a6abde
parent 2314: f95d63e2154a
child 2497: 3582bf76420e
permissions: -rw-r--r--

7011386: race in objArrayKlass::array_klass_impl
Summary: Move _lower_dimension field initialization before _higher_dimension and add storestore barrier.
Reviewed-by: dholmes, iveresov, never

 /*
  * Copyright (c) 1997, 2011, 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/systemDictionary.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "gc_interface/collectedHeap.hpp"
 #include "gc_interface/collectedHeap.inline.hpp"
 #include "memory/resourceArea.hpp"
 #include "memory/universe.hpp"
 #include "memory/universe.inline.hpp"
 #include "oops/instanceKlass.hpp"
 #include "oops/klassOop.hpp"
 #include "oops/objArrayKlassKlass.hpp"
 #include "oops/oop.inline.hpp"
 #include "oops/typeArrayKlass.hpp"
 #include "oops/typeArrayOop.hpp"
 #include "runtime/handles.inline.hpp"
 bool typeArrayKlass::compute_is_subtype_of(klassOop k) {
   if (!k->klass_part()->oop_is_typeArray()) {
     return arrayKlass::compute_is_subtype_of(k);
   }
   typeArrayKlass* tak = typeArrayKlass::cast(k);
   if (dimension() != tak->dimension()) return false;
   return element_type() == tak->element_type();
 }
 klassOop typeArrayKlass::create_klass(BasicType type, int scale,
                                       const char* name_str, TRAPS) {
   typeArrayKlass o;
   symbolHandle sym(symbolOop(NULL));
   // bootstrapping: don't create sym if symbolKlass not created yet
   if (Universe::symbolKlassObj() != NULL && name_str != NULL) {
     sym = oopFactory::new_symbol_handle(name_str, CHECK_NULL);
   }
   KlassHandle klassklass (THREAD, Universe::typeArrayKlassKlassObj());
   arrayKlassHandle k = base_create_array_klass(o.vtbl_value(), header_size(), klassklass, CHECK_NULL);
   typeArrayKlass* ak = typeArrayKlass::cast(k());
   ak->set_name(sym());
   ak->set_layout_helper(array_layout_helper(type));
   assert(scale == (1 << ak->log2_element_size()), "scale must check out");
   assert(ak->oop_is_javaArray(), "sanity");
   assert(ak->oop_is_typeArray(), "sanity");
   ak->set_max_length(arrayOopDesc::max_array_length(type));
   assert(k()->size() > header_size(), "bad size");
   // Call complete_create_array_klass after all instance variables have been initialized.
   KlassHandle super (THREAD, k->super());
   complete_create_array_klass(k, super, CHECK_NULL);
   return k();
 }
 typeArrayOop typeArrayKlass::allocate(int length, TRAPS) {
   assert(log2_element_size() >= 0, "bad scale");
   if (length >= 0) {
     if (length <= max_length()) {
       size_t size = typeArrayOopDesc::object_size(layout_helper(), length);
       KlassHandle h_k(THREAD, as_klassOop());
       typeArrayOop t;
       CollectedHeap* ch = Universe::heap();
       if (size < ch->large_typearray_limit()) {
         t = (typeArrayOop)CollectedHeap::array_allocate(h_k, (int)size, length, CHECK_NULL);
       } else {
         t = (typeArrayOop)CollectedHeap::large_typearray_allocate(h_k, (int)size, length, CHECK_NULL);
       }
       assert(t->is_parsable(), "Don't publish unless parsable");
       return t;
     } else {
       report_java_out_of_memory("Requested array size exceeds VM limit");
       THROW_OOP_0(Universe::out_of_memory_error_array_size());
     }
   } else {
     THROW_0(vmSymbols::java_lang_NegativeArraySizeException());
   }
 }
 typeArrayOop typeArrayKlass::allocate_permanent(int length, TRAPS) {
   if (length < 0) THROW_0(vmSymbols::java_lang_NegativeArraySizeException());
   int size = typeArrayOopDesc::object_size(layout_helper(), length);
   KlassHandle h_k(THREAD, as_klassOop());
   typeArrayOop t = (typeArrayOop)
     CollectedHeap::permanent_array_allocate(h_k, size, length, CHECK_NULL);
   assert(t->is_parsable(), "Can't publish until parsable");
   return t;
 }
 oop typeArrayKlass::multi_allocate(int rank, jint* last_size, TRAPS) {
   // For typeArrays this is only called for the last dimension
   assert(rank == 1, "just checking");
   int length = *last_size;
   return allocate(length, THREAD);
 }
 void typeArrayKlass::copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS) {
   assert(s->is_typeArray(), "must be type array");
   // Check destination
   if (!d->is_typeArray() || element_type() != typeArrayKlass::cast(d->klass())->element_type()) {
     THROW(vmSymbols::java_lang_ArrayStoreException());
   }
   // Check is all offsets and lengths are non negative
   if (src_pos < 0 || dst_pos < 0 || length < 0) {
     THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
   }
   // Check if the ranges are valid
   if  ( (((unsigned int) length + (unsigned int) src_pos) > (unsigned int) s->length())
      || (((unsigned int) length + (unsigned int) dst_pos) > (unsigned int) d->length()) ) {
     THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
   }
   // Check zero copy
   if (length == 0)
     return;
   // This is an attempt to make the copy_array fast.
   int l2es = log2_element_size();
   int ihs = array_header_in_bytes() / wordSize;
   char* src = (char*) ((oop*)s + ihs) + ((size_t)src_pos << l2es);
   char* dst = (char*) ((oop*)d + ihs) + ((size_t)dst_pos << l2es);
   Copy::conjoint_memory_atomic(src, dst, (size_t)length << l2es);
 }
 // create a klass of array holding typeArrays
 klassOop typeArrayKlass::array_klass_impl(bool or_null, int n, TRAPS) {
   typeArrayKlassHandle h_this(THREAD, as_klassOop());
   return array_klass_impl(h_this, or_null, n, THREAD);
 }
 klassOop typeArrayKlass::array_klass_impl(typeArrayKlassHandle h_this, bool or_null, int n, TRAPS) {
   int dimension = h_this->dimension();
   assert(dimension <= n, "check order of chain");
     if (dimension == n)
       return h_this();
   objArrayKlassHandle  h_ak(THREAD, h_this->higher_dimension());
   if (h_ak.is_null()) {
     if (or_null)  return NULL;
     ResourceMark rm;
     JavaThread *jt = (JavaThread *)THREAD;
     {
       MutexLocker mc(Compile_lock, THREAD);   // for vtables
       // Atomic create higher dimension and link into list
       MutexLocker mu(MultiArray_lock, THREAD);
       h_ak = objArrayKlassHandle(THREAD, h_this->higher_dimension());
       if (h_ak.is_null()) {
         klassOop oak = objArrayKlassKlass::cast(
           Universe::objArrayKlassKlassObj())->allocate_objArray_klass(
           dimension + 1, h_this, CHECK_NULL);
         h_ak = objArrayKlassHandle(THREAD, oak);
         h_ak->set_lower_dimension(h_this());
         OrderAccess::storestore();
         h_this->set_higher_dimension(h_ak());
         assert(h_ak->oop_is_objArray(), "incorrect initialization of objArrayKlass");
       }
     }
   } else {
     CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
   }
   if (or_null) {
     return h_ak->array_klass_or_null(n);
   }
   return h_ak->array_klass(n, CHECK_NULL);
 }
 klassOop typeArrayKlass::array_klass_impl(bool or_null, TRAPS) {
   return array_klass_impl(or_null, dimension() +  1, THREAD);
 }
 int typeArrayKlass::oop_size(oop obj) const {
   assert(obj->is_typeArray(),"must be a type array");
   typeArrayOop t = typeArrayOop(obj);
   return t->object_size();
 }
 void typeArrayKlass::oop_follow_contents(oop obj) {
   assert(obj->is_typeArray(),"must be a type array");
   // Performance tweak: We skip iterating over the klass pointer since we
   // know that Universe::typeArrayKlass never moves.
 }
 #ifndef SERIALGC
 void typeArrayKlass::oop_follow_contents(ParCompactionManager* cm, oop obj) {
   assert(obj->is_typeArray(),"must be a type array");
   // Performance tweak: We skip iterating over the klass pointer since we
   // know that Universe::typeArrayKlass never moves.
 }
 #endif // SERIALGC
 int typeArrayKlass::oop_adjust_pointers(oop obj) {
   assert(obj->is_typeArray(),"must be a type array");
   typeArrayOop t = typeArrayOop(obj);
   // Performance tweak: We skip iterating over the klass pointer since we
   // know that Universe::typeArrayKlass never moves.
   return t->object_size();
 }
 int typeArrayKlass::oop_oop_iterate(oop obj, OopClosure* blk) {
   assert(obj->is_typeArray(),"must be a type array");
   typeArrayOop t = typeArrayOop(obj);
   // Performance tweak: We skip iterating over the klass pointer since we
   // know that Universe::typeArrayKlass never moves.
   return t->object_size();
 }
 int typeArrayKlass::oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
   assert(obj->is_typeArray(),"must be a type array");
   typeArrayOop t = typeArrayOop(obj);
   // Performance tweak: We skip iterating over the klass pointer since we
   // know that Universe::typeArrayKlass never moves.
   return t->object_size();
 }
 #ifndef SERIALGC
 void typeArrayKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
   assert(obj->is_typeArray(),"must be a type array");
 }
 int
 typeArrayKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
   assert(obj->is_typeArray(),"must be a type array");
   return typeArrayOop(obj)->object_size();
 }
 int
 typeArrayKlass::oop_update_pointers(ParCompactionManager* cm, oop obj,
                                     HeapWord* beg_addr, HeapWord* end_addr) {
   assert(obj->is_typeArray(),"must be a type array");
   return typeArrayOop(obj)->object_size();
 }
 #endif // SERIALGC
 void typeArrayKlass::initialize(TRAPS) {
   // Nothing to do. Having this function is handy since objArrayKlasses can be
   // initialized by calling initialize on their bottom_klass, see objArrayKlass::initialize
 }
 const char* typeArrayKlass::external_name(BasicType type) {
   switch (type) {
     case T_BOOLEAN: return "[Z";
     case T_CHAR:    return "[C";
     case T_FLOAT:   return "[F";
     case T_DOUBLE:  return "[D";
     case T_BYTE:    return "[B";
     case T_SHORT:   return "[S";
     case T_INT:     return "[I";
     case T_LONG:    return "[J";
     default: ShouldNotReachHere();
   }
   return NULL;
 }
 #ifndef PRODUCT
 // Printing
 static void print_boolean_array(typeArrayOop ta, int print_len, outputStream* st) {
   for (int index = 0; index < print_len; index++) {
     st->print_cr(" - %3d: %s", index, (ta->bool_at(index) == 0) ? "false" : "true");
   }
 }
 static void print_char_array(typeArrayOop ta, int print_len, outputStream* st) {
   for (int index = 0; index < print_len; index++) {
     jchar c = ta->char_at(index);
     st->print_cr(" - %3d: %x %c", index, c, isprint(c) ? c : ' ');
   }
 }
 static void print_float_array(typeArrayOop ta, int print_len, outputStream* st) {
   for (int index = 0; index < print_len; index++) {
     st->print_cr(" - %3d: %g", index, ta->float_at(index));
   }
 }
 static void print_double_array(typeArrayOop ta, int print_len, outputStream* st) {
   for (int index = 0; index < print_len; index++) {
     st->print_cr(" - %3d: %g", index, ta->double_at(index));
   }
 }
 static void print_byte_array(typeArrayOop ta, int print_len, outputStream* st) {
   for (int index = 0; index < print_len; index++) {
     jbyte c = ta->byte_at(index);
     st->print_cr(" - %3d: %x %c", index, c, isprint(c) ? c : ' ');
   }
 }
 static void print_short_array(typeArrayOop ta, int print_len, outputStream* st) {
   for (int index = 0; index < print_len; index++) {
     int v = ta->ushort_at(index);
     st->print_cr(" - %3d: 0x%x\t %d", index, v, v);
   }
 }
 static void print_int_array(typeArrayOop ta, int print_len, outputStream* st) {
   for (int index = 0; index < print_len; index++) {
     jint v = ta->int_at(index);
     st->print_cr(" - %3d: 0x%x %d", index, v, v);
   }
 }
 static void print_long_array(typeArrayOop ta, int print_len, outputStream* st) {
   for (int index = 0; index < print_len; index++) {
     jlong v = ta->long_at(index);
     st->print_cr(" - %3d: 0x%x 0x%x", index, high(v), low(v));
   }
 }
 void typeArrayKlass::oop_print_on(oop obj, outputStream* st) {
   arrayKlass::oop_print_on(obj, st);
   typeArrayOop ta = typeArrayOop(obj);
   int print_len = MIN2((intx) ta->length(), MaxElementPrintSize);
   switch (element_type()) {
     case T_BOOLEAN: print_boolean_array(ta, print_len, st); break;
     case T_CHAR:    print_char_array(ta, print_len, st);    break;
     case T_FLOAT:   print_float_array(ta, print_len, st);   break;
     case T_DOUBLE:  print_double_array(ta, print_len, st);  break;
     case T_BYTE:    print_byte_array(ta, print_len, st);    break;
     case T_SHORT:   print_short_array(ta, print_len, st);   break;
     case T_INT:     print_int_array(ta, print_len, st);     break;
     case T_LONG:    print_long_array(ta, print_len, st);    break;
     default: ShouldNotReachHere();
   }
   int remaining = ta->length() - print_len;
   if (remaining > 0) {
     tty->print_cr(" - <%d more elements, increase MaxElementPrintSize to print>", remaining);
   }
 }
 #endif // PRODUCT
 const char* typeArrayKlass::internal_name() const {
   return Klass::external_name();
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/typeArrayKlass.cpp@d4fca0a6abde (annotated)

src/share/vm/oops/typeArrayKlass.cpp