view src/share/vm/prims/jvmtiCodeBlobEvents.hpp @ 1716:be3f9c242c9d

6948538: CMS: BOT walkers can fall into object allocation and initialization cracks Summary: GC workers now recognize an intermediate transient state of blocks which are allocated but have not yet completed initialization. blk_start() calls do not attempt to determine the size of a block in the transient state, rather waiting for the block to become initialized so that it is safe to query its size. Audited and ensured the order of initialization of object fields (klass, free bit and size) to respect block state transition protocol. Also included some new assertion checking code enabled in debug mode. Reviewed-by: chrisphi, johnc, poonam
author ysr
date Mon, 16 Aug 2010 15:58:42 -0700
parents c18cbe5936b8
children f95d63e2154a
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/*
 * Copyright (c) 2003, 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.
 *
 */

#ifndef _JVMTI_CODE_BLOB_EVENTS_H_
#define _JVMTI_CODE_BLOB_EVENTS_H_

// forward declaration
class JvmtiEnv;


// JVMTI code blob event support
// -- used by GenerateEvents to generate CompiledMethodLoad and
//    DynamicCodeGenerated events
// -- also provide utility function build_jvmti_addr_location_map to create
//    a jvmtiAddrLocationMap list for a nmethod.

class JvmtiCodeBlobEvents : public AllStatic {
 public:

  // generate a DYNAMIC_CODE_GENERATED_EVENT event for each non-nmethod
  // code blob in the code cache.
  static jvmtiError generate_dynamic_code_events(JvmtiEnv* env);

  // generate a COMPILED_METHOD_LOAD event for each nmethod
  // code blob in the code cache.
  static jvmtiError generate_compiled_method_load_events(JvmtiEnv* env);

  // create a C-heap allocated address location map for an nmethod
  static void build_jvmti_addr_location_map(nmethod *nm, jvmtiAddrLocationMap** map,
                                            jint *map_length);
};

#endif