jdk8-mips64-public/hotspot: src/share/vm/oops/constMethodKlass.cpp@e1162778c1c8 (annotated)

src/share/vm/oops/constMethodKlass.cpp@e1162778c1c8 (annotated)

src/share/vm/oops/constMethodKlass.cpp

Thu, 07 Apr 2011 09:53:20 -0700

author: johnc
date: Thu, 07 Apr 2011 09:53:20 -0700
changeset 2781: e1162778c1c8
parent 2534: e5383553fd4e
child 3099: c124e2e7463e
permissions: -rw-r--r--

7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
Summary: A referent object that is only weakly reachable at the start of concurrent marking but is re-attached to the strongly reachable object graph during marking may not be marked as live. This can cause the reference object to be processed prematurely and leave dangling pointers to the referent object. Implement a read barrier for the java.lang.ref.Reference::referent field by intrinsifying the Reference.get() method, and intercepting accesses though JNI, reflection, and Unsafe, so that when a non-null referent object is read it is also logged in an SATB buffer.
Reviewed-by: kvn, iveresov, never, tonyp, dholmes

 /*
  * Copyright (c) 2003, 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 "gc_implementation/shared/markSweep.inline.hpp"
 #include "interpreter/interpreter.hpp"
 #include "memory/gcLocker.hpp"
 #include "memory/resourceArea.hpp"
 #include "oops/constMethodKlass.hpp"
 #include "oops/constMethodOop.hpp"
 #include "oops/oop.inline.hpp"
 #include "oops/oop.inline2.hpp"
 #include "runtime/handles.inline.hpp"
 klassOop constMethodKlass::create_klass(TRAPS) {
   constMethodKlass 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 constMethodKlass::oop_size(oop obj) const {
   assert(obj->is_constMethod(), "must be constMethod oop");
   return constMethodOop(obj)->object_size();
 }
 bool constMethodKlass::oop_is_parsable(oop obj) const {
   assert(obj->is_constMethod(), "must be constMethod oop");
   return constMethodOop(obj)->object_is_parsable();
 }
 bool constMethodKlass::oop_is_conc_safe(oop obj) const {
   assert(obj->is_constMethod(), "must be constMethod oop");
   return constMethodOop(obj)->is_conc_safe();
 }
 constMethodOop constMethodKlass::allocate(int byte_code_size,
                                           int compressed_line_number_size,
                                           int localvariable_table_length,
                                           int checked_exceptions_length,
                                           bool is_conc_safe,
                                           TRAPS) {
   int size = constMethodOopDesc::object_size(byte_code_size,
                                              compressed_line_number_size,
                                              localvariable_table_length,
                                              checked_exceptions_length);
   KlassHandle h_k(THREAD, as_klassOop());
   constMethodOop cm = (constMethodOop)
     CollectedHeap::permanent_obj_allocate(h_k, size, CHECK_NULL);
   assert(!cm->is_parsable(), "Not yet safely parsable");
   No_Safepoint_Verifier no_safepoint;
   cm->set_interpreter_kind(Interpreter::invalid);
   cm->init_fingerprint();
   cm->set_method(NULL);
   cm->set_stackmap_data(NULL);
   cm->set_exception_table(NULL);
   cm->set_code_size(byte_code_size);
   cm->set_constMethod_size(size);
   cm->set_inlined_tables_length(checked_exceptions_length,
                                 compressed_line_number_size,
                                 localvariable_table_length);
   assert(cm->size() == size, "wrong size for object");
   cm->set_is_conc_safe(is_conc_safe);
   cm->set_partially_loaded();
   assert(cm->is_parsable(), "Is safely parsable by gc");
   return cm;
 }
 void constMethodKlass::oop_follow_contents(oop obj) {
   assert (obj->is_constMethod(), "object must be constMethod");
   constMethodOop cm = constMethodOop(obj);
   MarkSweep::mark_and_push(cm->adr_method());
   MarkSweep::mark_and_push(cm->adr_stackmap_data());
   MarkSweep::mark_and_push(cm->adr_exception_table());
   // Performance tweak: We skip iterating over the klass pointer since we
   // know that Universe::constMethodKlassObj never moves.
 }
 #ifndef SERIALGC
 void constMethodKlass::oop_follow_contents(ParCompactionManager* cm,
                                            oop obj) {
   assert (obj->is_constMethod(), "object must be constMethod");
   constMethodOop cm_oop = constMethodOop(obj);
   PSParallelCompact::mark_and_push(cm, cm_oop->adr_method());
   PSParallelCompact::mark_and_push(cm, cm_oop->adr_stackmap_data());
   PSParallelCompact::mark_and_push(cm, cm_oop->adr_exception_table());
   // Performance tweak: We skip iterating over the klass pointer since we
   // know that Universe::constMethodKlassObj never moves.
 }
 #endif // SERIALGC
 int constMethodKlass::oop_oop_iterate(oop obj, OopClosure* blk) {
   assert (obj->is_constMethod(), "object must be constMethod");
   constMethodOop cm = constMethodOop(obj);
   blk->do_oop(cm->adr_method());
   blk->do_oop(cm->adr_stackmap_data());
   blk->do_oop(cm->adr_exception_table());
   // Get size before changing pointers.
   // Don't call size() or oop_size() since that is a virtual call.
   int size = cm->object_size();
   return size;
 }
 int constMethodKlass::oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
   assert (obj->is_constMethod(), "object must be constMethod");
   constMethodOop cm = constMethodOop(obj);
   oop* adr;
   adr = cm->adr_method();
   if (mr.contains(adr)) blk->do_oop(adr);
   adr = cm->adr_stackmap_data();
   if (mr.contains(adr)) blk->do_oop(adr);
   adr = cm->adr_exception_table();
   if (mr.contains(adr)) blk->do_oop(adr);
   // Get size before changing pointers.
   // Don't call size() or oop_size() since that is a virtual call.
   int size = cm->object_size();
   // Performance tweak: We skip iterating over the klass pointer since we
   // know that Universe::constMethodKlassObj never moves.
   return size;
 }
 int constMethodKlass::oop_adjust_pointers(oop obj) {
   assert(obj->is_constMethod(), "should be constMethod");
   constMethodOop cm = constMethodOop(obj);
   MarkSweep::adjust_pointer(cm->adr_method());
   MarkSweep::adjust_pointer(cm->adr_stackmap_data());
   MarkSweep::adjust_pointer(cm->adr_exception_table());
   // Get size before changing pointers.
   // Don't call size() or oop_size() since that is a virtual call.
   int size = cm->object_size();
   // Performance tweak: We skip iterating over the klass pointer since we
   // know that Universe::constMethodKlassObj never moves.
   return size;
 }
 #ifndef SERIALGC
 void constMethodKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
   assert(obj->is_constMethod(), "should be constMethod");
 }
 int constMethodKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
   assert(obj->is_constMethod(), "should be constMethod");
   constMethodOop cm_oop = constMethodOop(obj);
 #if 0
   PSParallelCompact::adjust_pointer(cm_oop->adr_method());
   PSParallelCompact::adjust_pointer(cm_oop->adr_exception_table());
   PSParallelCompact::adjust_pointer(cm_oop->adr_stackmap_data());
 #endif
   oop* const beg_oop = cm_oop->oop_block_beg();
   oop* const end_oop = cm_oop->oop_block_end();
   for (oop* cur_oop = beg_oop; cur_oop < end_oop; ++cur_oop) {
     PSParallelCompact::adjust_pointer(cur_oop);
   }
   return cm_oop->object_size();
 }
 #endif // SERIALGC
 // Printing
 void constMethodKlass::oop_print_on(oop obj, outputStream* st) {
   ResourceMark rm;
   assert(obj->is_constMethod(), "must be constMethod");
   Klass::oop_print_on(obj, st);
   constMethodOop m = constMethodOop(obj);
   st->print(" - method:       " INTPTR_FORMAT " ", (address)m->method());
   m->method()->print_value_on(st); st->cr();
   st->print(" - exceptions:   " INTPTR_FORMAT "\n", (address)m->exception_table());
   if (m->has_stackmap_table()) {
     st->print(" - stackmap data:       ");
     m->stackmap_data()->print_value_on(st);
     st->cr();
   }
 }
 // Short version of printing constMethodOop - just print the name of the
 // method it belongs to.
 void constMethodKlass::oop_print_value_on(oop obj, outputStream* st) {
   assert(obj->is_constMethod(), "must be constMethod");
   constMethodOop m = constMethodOop(obj);
   st->print(" const part of method " );
   m->method()->print_value_on(st);
 }
 const char* constMethodKlass::internal_name() const {
   return "{constMethod}";
 }
 // Verification
 void constMethodKlass::oop_verify_on(oop obj, outputStream* st) {
   Klass::oop_verify_on(obj, st);
   guarantee(obj->is_constMethod(), "object must be constMethod");
   constMethodOop m = constMethodOop(obj);
   guarantee(m->is_perm(),                            "should be in permspace");
   // Verification can occur during oop construction before the method or
   // other fields have been initialized.
   if (!obj->partially_loaded()) {
     guarantee(m->method()->is_perm(), "should be in permspace");
     guarantee(m->method()->is_method(), "should be method");
     typeArrayOop stackmap_data = m->stackmap_data();
     guarantee(stackmap_data == NULL ||
               stackmap_data->is_perm(),  "should be in permspace");
     guarantee(m->exception_table()->is_perm(), "should be in permspace");
     guarantee(m->exception_table()->is_typeArray(), "should be type array");
     address m_end = (address)((oop*) m + m->size());
     address compressed_table_start = m->code_end();
     guarantee(compressed_table_start <= m_end, "invalid method layout");
     address compressed_table_end = compressed_table_start;
     // Verify line number table
     if (m->has_linenumber_table()) {
       CompressedLineNumberReadStream stream(m->compressed_linenumber_table());
       while (stream.read_pair()) {
         guarantee(stream.bci() >= 0 && stream.bci() <= m->code_size(), "invalid bci in line number table");
       }
       compressed_table_end += stream.position();
     }
     guarantee(compressed_table_end <= m_end, "invalid method layout");
     // Verify checked exceptions and local variable tables
     if (m->has_checked_exceptions()) {
       u2* addr = m->checked_exceptions_length_addr();
       guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
     }
     if (m->has_localvariable_table()) {
       u2* addr = m->localvariable_table_length_addr();
       guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
     }
     // Check compressed_table_end relative to uncompressed_table_start
     u2* uncompressed_table_start;
     if (m->has_localvariable_table()) {
       uncompressed_table_start = (u2*) m->localvariable_table_start();
     } else {
       if (m->has_checked_exceptions()) {
         uncompressed_table_start = (u2*) m->checked_exceptions_start();
       } else {
         uncompressed_table_start = (u2*) m_end;
       }
     }
     int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end;
     int max_gap = align_object_size(1)*BytesPerWord;
     guarantee(gap >= 0 && gap < max_gap, "invalid method layout");
   }
 }
 bool constMethodKlass::oop_partially_loaded(oop obj) const {
   assert(obj->is_constMethod(), "object must be klass");
   constMethodOop m = constMethodOop(obj);
   // check whether exception_table points to self (flag for partially loaded)
   return m->exception_table() == (typeArrayOop)obj;
 }
 // The exception_table is the last field set when loading an object.
 void constMethodKlass::oop_set_partially_loaded(oop obj) {
   assert(obj->is_constMethod(), "object must be klass");
   constMethodOop m = constMethodOop(obj);
   // Temporarily set exception_table to point to self
   m->set_exception_table((typeArrayOop)obj);
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/constMethodKlass.cpp@e1162778c1c8 (annotated)

src/share/vm/oops/constMethodKlass.cpp