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annotate src/share/vm/prims/jniCheck.hpp @ 1716:be3f9c242c9d

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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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1 /*
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2 * Copyright (c) 2003, 2008, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 extern "C" {
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26 // Report a JNI failure caught by -Xcheck:jni. Perform a core dump.
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27 // Note: two variations -- one to be called when in VM state (e.g. when
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28 // within IN_VM macro), one to be called when in NATIVE state.
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29
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30 // When in VM state:
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31 static void ReportJNIFatalError(JavaThread* thr, const char *msg) {
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32 tty->print_cr("FATAL ERROR in native method: %s", msg);
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33 thr->print_stack();
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34 os::abort(true);
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35 }
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36 }
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37
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38 //
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39 // Checked JNI routines that are useful for outside of checked JNI
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40 //
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41
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42 class jniCheck : public AllStatic {
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43 public:
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44 static oop validate_handle(JavaThread* thr, jobject obj);
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45 static oop validate_object(JavaThread* thr, jobject obj);
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46 static klassOop validate_class(JavaThread* thr, jclass clazz, bool allow_primitive = false);
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47 static void validate_class_descriptor(JavaThread* thr, const char* name);
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48 static void validate_throwable_klass(JavaThread* thr, klassOop klass);
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49 static void validate_call_object(JavaThread* thr, jobject obj, jmethodID method_id);
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50 static void validate_call_class(JavaThread* thr, jclass clazz, jmethodID method_id);
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51 static methodOop validate_jmethod_id(JavaThread* thr, jmethodID method_id);
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52 };