Mercurial > hg > truffle
view graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/stubs/ExceptionHandlerStub.java @ 10491:e98e021d1e7e
Forbid direct eden allocation when G1 is enabled
author | Christos Kotselidis <christos.kotselidis@oracle.com> |
---|---|
date | Fri, 21 Jun 2013 11:08:10 +0200 |
parents | 4391fd907278 |
children | 3209552fdb4e |
line wrap: on
line source
/* * Copyright (c) 2012, 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. */ package com.oracle.graal.hotspot.stubs; import static com.oracle.graal.hotspot.HotSpotGraalRuntime.*; import static com.oracle.graal.hotspot.nodes.PatchReturnAddressNode.*; import static com.oracle.graal.hotspot.replacements.HotSpotReplacementsUtil.*; import static com.oracle.graal.hotspot.stubs.StubUtil.*; import com.oracle.graal.api.code.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.graph.Node.ConstantNodeParameter; import com.oracle.graal.graph.Node.NodeIntrinsic; import com.oracle.graal.hotspot.*; import com.oracle.graal.hotspot.bridge.*; import com.oracle.graal.hotspot.meta.*; import com.oracle.graal.hotspot.nodes.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.replacements.*; import com.oracle.graal.replacements.Snippet.Fold; import com.oracle.graal.word.*; /** * Stub called by the {@linkplain Marks#MARK_EXCEPTION_HANDLER_ENTRY exception handler entry point} * in a compiled method. This entry point is used when returning to a method to handle an exception * thrown by a callee. It is not used for routing implicit exceptions. Therefore, it does not need * to save any registers as HotSpot uses a caller save convention. * <p> * The descriptor for a call to this stub is {@link HotSpotBackend#EXCEPTION_HANDLER}. */ public class ExceptionHandlerStub extends SnippetStub { public ExceptionHandlerStub(final HotSpotRuntime runtime, Replacements replacements, TargetDescription target, HotSpotForeignCallLinkage linkage) { super(runtime, replacements, target, linkage); } /** * This stub is called when returning to a method to handle an exception thrown by a callee. It * is not used for routing implicit exceptions. Therefore, it does not need to save any * registers as HotSpot uses a caller save convention. */ @Override public boolean preservesRegisters() { return false; } @Snippet private static void exceptionHandler(Object exception, Word exceptionPc) { checkNoExceptionInThread(assertionsEnabled()); checkExceptionNotNull(assertionsEnabled(), exception); writeExceptionOop(thread(), exception); writeExceptionPc(thread(), exceptionPc); if (logging()) { printf("handling exception %p (", Word.fromObject(exception).rawValue()); decipher(Word.fromObject(exception).rawValue()); printf(") at %p (", exceptionPc.rawValue()); decipher(exceptionPc.rawValue()); printf(")\n"); } // patch throwing pc into return address so that deoptimization finds the right debug info patchReturnAddress(exceptionPc); Word handlerPc = exceptionHandlerForPc(EXCEPTION_HANDLER_FOR_PC, thread()); if (logging()) { printf("handler for exception %p at %p is at %p (", Word.fromObject(exception).rawValue(), exceptionPc.rawValue(), handlerPc.rawValue()); decipher(handlerPc.rawValue()); printf(")\n"); } // patch the return address so that this stub returns to the exception handler patchReturnAddress(handlerPc); } static void checkNoExceptionInThread(boolean enabled) { if (enabled) { Object currentException = readExceptionOop(thread()); if (currentException != null) { fatal("exception object in thread must be null, not %p", Word.fromObject(currentException).rawValue()); } Word currentExceptionPc = readExceptionPc(thread()); if (currentExceptionPc.notEqual(Word.zero())) { fatal("exception PC in thread must be zero, not %p", currentExceptionPc.rawValue()); } } } static void checkExceptionNotNull(boolean enabled, Object exception) { if (enabled && exception == null) { fatal("exception must not be null"); } } @Fold private static boolean logging() { return Boolean.getBoolean("graal.logExceptionHandlerStub"); } @Fold @SuppressWarnings("all") private static boolean assertionsEnabled() { boolean enabled = false; assert enabled = true; return enabled || graalRuntime().getConfig().cAssertions; } public static final ForeignCallDescriptor EXCEPTION_HANDLER_FOR_PC = descriptorFor(ExceptionHandlerStub.class, "exceptionHandlerForPc"); @NodeIntrinsic(value = StubForeignCallNode.class, setStampFromReturnType = true) public static native Word exceptionHandlerForPc(@ConstantNodeParameter ForeignCallDescriptor exceptionHandlerForPc, Word thread); }