1 /* 2 * Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 25 package org.graalvm.compiler.hotspot.stubs; 26 27 import static org.graalvm.compiler.hotspot.GraalHotSpotVMConfig.INJECTED_OPTIONVALUES; 28 import static org.graalvm.compiler.hotspot.GraalHotSpotVMConfig.INJECTED_VMCONFIG; 29 import static org.graalvm.compiler.hotspot.nodes.JumpToExceptionHandlerInCallerNode.jumpToExceptionHandlerInCaller; 30 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.registerAsWord; 31 import static org.graalvm.compiler.hotspot.stubs.ExceptionHandlerStub.checkExceptionNotNull; 32 import static org.graalvm.compiler.hotspot.stubs.ExceptionHandlerStub.checkNoExceptionInThread; 33 import static org.graalvm.compiler.hotspot.stubs.StubUtil.cAssertionsEnabled; 34 import static org.graalvm.compiler.hotspot.stubs.StubUtil.decipher; 35 import static org.graalvm.compiler.hotspot.stubs.StubUtil.newDescriptor; 36 import static org.graalvm.compiler.hotspot.stubs.StubUtil.printf; 37 38 import org.graalvm.compiler.api.replacements.Fold; 39 import org.graalvm.compiler.api.replacements.Fold.InjectedParameter; 40 import org.graalvm.compiler.api.replacements.Snippet; 41 import org.graalvm.compiler.api.replacements.Snippet.ConstantParameter; 42 import org.graalvm.compiler.core.common.spi.ForeignCallDescriptor; 43 import org.graalvm.compiler.debug.Assertions; 44 import org.graalvm.compiler.graph.Node.ConstantNodeParameter; 45 import org.graalvm.compiler.graph.Node.NodeIntrinsic; 46 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig; 47 import org.graalvm.compiler.hotspot.HotSpotForeignCallLinkage; 48 import org.graalvm.compiler.hotspot.meta.HotSpotProviders; 49 import org.graalvm.compiler.hotspot.nodes.StubForeignCallNode; 50 import org.graalvm.compiler.nodes.UnwindNode; 51 import org.graalvm.compiler.options.OptionValues; 52 import org.graalvm.compiler.word.Word; 53 import jdk.internal.vm.compiler.word.Pointer; 54 55 import jdk.vm.ci.code.Register; 56 57 /** 58 * Stub called by an {@link UnwindNode}. This stub executes in the frame of the method throwing an 59 * exception and completes by jumping to the exception handler in the calling frame. 60 */ 61 public class UnwindExceptionToCallerStub extends SnippetStub { 62 UnwindExceptionToCallerStub(OptionValues options, HotSpotProviders providers, HotSpotForeignCallLinkage linkage)63 public UnwindExceptionToCallerStub(OptionValues options, HotSpotProviders providers, HotSpotForeignCallLinkage linkage) { 64 super("unwindExceptionToCaller", options, providers, linkage); 65 } 66 67 @Override getConstantParameterValue(int index, String name)68 protected Object getConstantParameterValue(int index, String name) { 69 if (index == 2) { 70 return providers.getRegisters().getThreadRegister(); 71 } 72 throw new InternalError(); 73 } 74 75 @Snippet unwindExceptionToCaller(Object exception, Word returnAddress, @ConstantParameter Register threadRegister)76 private static void unwindExceptionToCaller(Object exception, Word returnAddress, @ConstantParameter Register threadRegister) { 77 Pointer exceptionOop = Word.objectToTrackedPointer(exception); 78 if (logging(INJECTED_OPTIONVALUES)) { 79 printf("unwinding exception %p (", exceptionOop.rawValue()); 80 decipher(exceptionOop.rawValue()); 81 printf(") at %p (", returnAddress.rawValue()); 82 decipher(returnAddress.rawValue()); 83 printf(")\n"); 84 } 85 Word thread = registerAsWord(threadRegister); 86 checkNoExceptionInThread(thread, assertionsEnabled(INJECTED_VMCONFIG)); 87 checkExceptionNotNull(assertionsEnabled(INJECTED_VMCONFIG), exception); 88 89 Word handlerInCallerPc = exceptionHandlerForReturnAddress(EXCEPTION_HANDLER_FOR_RETURN_ADDRESS, thread, returnAddress); 90 91 if (logging(INJECTED_OPTIONVALUES)) { 92 printf("handler for exception %p at return address %p is at %p (", exceptionOop.rawValue(), returnAddress.rawValue(), handlerInCallerPc.rawValue()); 93 decipher(handlerInCallerPc.rawValue()); 94 printf(")\n"); 95 } 96 97 jumpToExceptionHandlerInCaller(handlerInCallerPc, exception, returnAddress); 98 } 99 100 @Fold logging(@old.InjectedParameter OptionValues options)101 static boolean logging(@Fold.InjectedParameter OptionValues options) { 102 return StubOptions.TraceUnwindStub.getValue(options); 103 } 104 105 /** 106 * Determines if either Java assertions are enabled for Graal or if this is a HotSpot build 107 * where the ASSERT mechanism is enabled. 108 */ 109 @Fold 110 @SuppressWarnings("all") assertionsEnabled(@njectedParameter GraalHotSpotVMConfig config)111 static boolean assertionsEnabled(@InjectedParameter GraalHotSpotVMConfig config) { 112 return Assertions.assertionsEnabled() || cAssertionsEnabled(config); 113 } 114 115 public static final ForeignCallDescriptor EXCEPTION_HANDLER_FOR_RETURN_ADDRESS = newDescriptor(UnwindExceptionToCallerStub.class, "exceptionHandlerForReturnAddress", Word.class, Word.class, 116 Word.class); 117 118 @NodeIntrinsic(value = StubForeignCallNode.class) exceptionHandlerForReturnAddress(@onstantNodeParameter ForeignCallDescriptor exceptionHandlerForReturnAddress, Word thread, Word returnAddress)119 public static native Word exceptionHandlerForReturnAddress(@ConstantNodeParameter ForeignCallDescriptor exceptionHandlerForReturnAddress, Word thread, Word returnAddress); 120 } 121