| /* |
| * Copyright (c) 2012, 2015, 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 org.graalvm.compiler.hotspot.stubs; |
| |
| import static org.graalvm.compiler.hotspot.nodes.JumpToExceptionHandlerInCallerNode.jumpToExceptionHandlerInCaller; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.registerAsWord; |
| import static org.graalvm.compiler.hotspot.stubs.ExceptionHandlerStub.checkExceptionNotNull; |
| import static org.graalvm.compiler.hotspot.stubs.ExceptionHandlerStub.checkNoExceptionInThread; |
| import static org.graalvm.compiler.hotspot.stubs.StubUtil.cAssertionsEnabled; |
| import static org.graalvm.compiler.hotspot.stubs.StubUtil.decipher; |
| import static org.graalvm.compiler.hotspot.stubs.StubUtil.newDescriptor; |
| import static org.graalvm.compiler.hotspot.stubs.StubUtil.printf; |
| |
| import org.graalvm.compiler.api.replacements.Fold; |
| import org.graalvm.compiler.api.replacements.Fold.InjectedParameter; |
| import org.graalvm.compiler.api.replacements.Snippet; |
| import org.graalvm.compiler.api.replacements.Snippet.ConstantParameter; |
| import org.graalvm.compiler.core.common.spi.ForeignCallDescriptor; |
| import org.graalvm.compiler.graph.Node.ConstantNodeParameter; |
| import org.graalvm.compiler.graph.Node.NodeIntrinsic; |
| import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig; |
| import org.graalvm.compiler.hotspot.HotSpotForeignCallLinkage; |
| import org.graalvm.compiler.hotspot.meta.HotSpotProviders; |
| import org.graalvm.compiler.hotspot.nodes.StubForeignCallNode; |
| import org.graalvm.compiler.nodes.UnwindNode; |
| import org.graalvm.compiler.word.Pointer; |
| import org.graalvm.compiler.word.Word; |
| |
| import jdk.vm.ci.code.Register; |
| |
| /** |
| * 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.objectToTrackedPointer(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(null)); |
| checkExceptionNotNull(assertionsEnabled(null), 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 |
| static boolean logging() { |
| return StubOptions.TraceUnwindStub.getValue(); |
| } |
| |
| /** |
| * 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") |
| static boolean assertionsEnabled(@InjectedParameter GraalHotSpotVMConfig config) { |
| boolean enabled = false; |
| assert enabled = true; |
| return enabled || cAssertionsEnabled(config); |
| } |
| |
| 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); |
| } |