Mercurial > hg > graal-compiler
view graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/stubs/UnwindExceptionToCallerStub.java @ 21556:48c1ebd24120
renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 27 May 2015 00:36:16 +0200 |
parents | 14e703edb2ab |
children | 0e095e2c24e2 |
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/* * 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 com.oracle.jvmci.code.Register; import com.oracle.jvmci.meta.ForeignCallDescriptor; import static com.oracle.graal.hotspot.nodes.JumpToExceptionHandlerInCallerNode.*; import static com.oracle.graal.hotspot.replacements.HotSpotReplacementsUtil.*; import static com.oracle.graal.hotspot.stubs.ExceptionHandlerStub.*; import static com.oracle.graal.hotspot.stubs.StubUtil.*; import com.oracle.graal.api.replacements.*; import com.oracle.graal.graph.Node.ConstantNodeParameter; import com.oracle.graal.graph.Node.NodeIntrinsic; import com.oracle.graal.hotspot.*; import com.oracle.graal.hotspot.meta.*; import com.oracle.graal.hotspot.nodes.*; import com.oracle.graal.nodes.*; import com.oracle.graal.replacements.*; import com.oracle.graal.replacements.Snippet.ConstantParameter; import com.oracle.graal.word.*; /** * Stub called by an {@link UnwindNode}. This stub executes in the frame of the method throwing an * exception and completes by jumping to the exception handler in the calling frame. */ public class UnwindExceptionToCallerStub extends SnippetStub { public UnwindExceptionToCallerStub(HotSpotProviders providers, HotSpotForeignCallLinkage linkage) { super("unwindExceptionToCaller", providers, linkage); } /** * The current frame is unwound by this stub. Therefore, it does not need to save any registers * as HotSpot uses a caller save convention. */ @Override public boolean preservesRegisters() { return false; } @Override protected Object getConstantParameterValue(int index, String name) { assert index == 2; return providers.getRegisters().getThreadRegister(); } @Snippet private static void unwindExceptionToCaller(Object exception, Word returnAddress, @ConstantParameter Register threadRegister) { Pointer exceptionOop = Word.fromObject(exception); if (logging()) { printf("unwinding exception %p (", exceptionOop.rawValue()); decipher(exceptionOop.rawValue()); printf(") at %p (", returnAddress.rawValue()); decipher(returnAddress.rawValue()); printf(")\n"); } Word thread = registerAsWord(threadRegister); checkNoExceptionInThread(thread, assertionsEnabled()); checkExceptionNotNull(assertionsEnabled(), exception); Word handlerInCallerPc = exceptionHandlerForReturnAddress(EXCEPTION_HANDLER_FOR_RETURN_ADDRESS, thread, returnAddress); if (logging()) { printf("handler for exception %p at return address %p is at %p (", exceptionOop.rawValue(), returnAddress.rawValue(), handlerInCallerPc.rawValue()); decipher(handlerInCallerPc.rawValue()); printf(")\n"); } jumpToExceptionHandlerInCaller(handlerInCallerPc, exception, returnAddress); } @Fold private static boolean logging() { return Boolean.getBoolean("graal.logUnwindExceptionToCallerStub"); } /** * Determines if either Java assertions are enabled for {@link UnwindExceptionToCallerStub} or * if this is a HotSpot build where the ASSERT mechanism is enabled. * <p> * This first check relies on the per-class assertion status which is why this method must be in * this class. */ @Fold @SuppressWarnings("all") private static boolean assertionsEnabled() { boolean enabled = false; assert enabled = true; return enabled || cAssertionsEnabled(); } public static final ForeignCallDescriptor EXCEPTION_HANDLER_FOR_RETURN_ADDRESS = newDescriptor(UnwindExceptionToCallerStub.class, "exceptionHandlerForReturnAddress", Word.class, Word.class, Word.class); @NodeIntrinsic(value = StubForeignCallNode.class, setStampFromReturnType = true) public static native Word exceptionHandlerForReturnAddress(@ConstantNodeParameter ForeignCallDescriptor exceptionHandlerForReturnAddress, Word thread, Word returnAddress); }