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/*
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* Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.graalvm.compiler.hotspot.stubs;
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import static org.graalvm.compiler.hotspot.GraalHotSpotVMConfig.INJECTED_VMCONFIG;
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import static org.graalvm.compiler.hotspot.nodes.JumpToExceptionHandlerNode.jumpToExceptionHandler;
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import static org.graalvm.compiler.hotspot.nodes.PatchReturnAddressNode.patchReturnAddress;
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import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.readExceptionOop;
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import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.readExceptionPc;
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import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.registerAsWord;
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import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.writeExceptionOop;
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import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.writeExceptionPc;
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import static org.graalvm.compiler.hotspot.stubs.StubUtil.cAssertionsEnabled;
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import static org.graalvm.compiler.hotspot.stubs.StubUtil.decipher;
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import static org.graalvm.compiler.hotspot.stubs.StubUtil.fatal;
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import static org.graalvm.compiler.hotspot.stubs.StubUtil.newDescriptor;
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import static org.graalvm.compiler.hotspot.stubs.StubUtil.printf;
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import org.graalvm.compiler.api.replacements.Fold;
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import org.graalvm.compiler.api.replacements.Fold.InjectedParameter;
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import org.graalvm.compiler.api.replacements.Snippet;
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import org.graalvm.compiler.api.replacements.Snippet.ConstantParameter;
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import org.graalvm.compiler.core.common.spi.ForeignCallDescriptor;
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import org.graalvm.compiler.debug.Assertions;
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import org.graalvm.compiler.graph.Node.ConstantNodeParameter;
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import org.graalvm.compiler.graph.Node.NodeIntrinsic;
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import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;
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import org.graalvm.compiler.hotspot.HotSpotBackend;
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import org.graalvm.compiler.hotspot.HotSpotForeignCallLinkage;
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import org.graalvm.compiler.hotspot.meta.HotSpotProviders;
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import org.graalvm.compiler.hotspot.nodes.StubForeignCallNode;
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import org.graalvm.compiler.options.OptionValues;
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import org.graalvm.compiler.word.Word;
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import jdk.internal.vm.compiler.word.WordFactory;
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import jdk.vm.ci.code.Register;
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/**
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* Stub called by the {@linkplain GraalHotSpotVMConfig#MARKID_EXCEPTION_HANDLER_ENTRY exception
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* handler entry point} in a compiled method. This entry point is used when returning to a method to
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* handle an exception thrown by a callee. It is not used for routing implicit exceptions.
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* Therefore, it does not need to save any registers as HotSpot uses a caller save convention.
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* <p>
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* The descriptor for a call to this stub is {@link HotSpotBackend#EXCEPTION_HANDLER}.
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*/
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public class ExceptionHandlerStub extends SnippetStub {
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public ExceptionHandlerStub(OptionValues options, HotSpotProviders providers, HotSpotForeignCallLinkage linkage) {
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super("exceptionHandler", options, providers, linkage);
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}
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/**
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* This stub is called when returning to a method to handle an exception thrown by a callee. It
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* is not used for routing implicit exceptions. Therefore, it does not need to save any
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* registers as HotSpot uses a caller save convention.
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*/
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@Override
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public boolean preservesRegisters() {
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return false;
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}
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@Override
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protected Object getConstantParameterValue(int index, String name) {
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if (index == 2) {
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return providers.getRegisters().getThreadRegister();
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}
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assert index == 3;
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return StubOptions.TraceExceptionHandlerStub.getValue(options);
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}
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@Snippet
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private static void exceptionHandler(Object exception, Word exceptionPc, @ConstantParameter Register threadRegister, @ConstantParameter boolean logging) {
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Word thread = registerAsWord(threadRegister);
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checkNoExceptionInThread(thread, assertionsEnabled(INJECTED_VMCONFIG));
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checkExceptionNotNull(assertionsEnabled(INJECTED_VMCONFIG), exception);
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writeExceptionOop(thread, exception);
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writeExceptionPc(thread, exceptionPc);
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if (logging) {
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printf("handling exception %p (", Word.objectToTrackedPointer(exception).rawValue());
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decipher(Word.objectToTrackedPointer(exception).rawValue());
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printf(") at %p (", exceptionPc.rawValue());
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decipher(exceptionPc.rawValue());
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printf(")\n");
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}
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// patch throwing pc into return address so that deoptimization finds the right debug info
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patchReturnAddress(exceptionPc);
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Word handlerPc = exceptionHandlerForPc(EXCEPTION_HANDLER_FOR_PC, thread);
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if (logging) {
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printf("handler for exception %p at %p is at %p (", Word.objectToTrackedPointer(exception).rawValue(), exceptionPc.rawValue(), handlerPc.rawValue());
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decipher(handlerPc.rawValue());
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printf(")\n");
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}
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// patch the return address so that this stub returns to the exception handler
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jumpToExceptionHandler(handlerPc);
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}
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static void checkNoExceptionInThread(Word thread, boolean enabled) {
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if (enabled) {
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Object currentException = readExceptionOop(thread);
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if (currentException != null) {
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fatal("exception object in thread must be null, not %p", Word.objectToTrackedPointer(currentException).rawValue());
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}
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if (cAssertionsEnabled(INJECTED_VMCONFIG)) {
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// This thread-local is only cleared in DEBUG builds of the VM
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// (see OptoRuntime::generate_exception_blob)
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Word currentExceptionPc = readExceptionPc(thread);
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if (currentExceptionPc.notEqual(WordFactory.zero())) {
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fatal("exception PC in thread must be zero, not %p", currentExceptionPc.rawValue());
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}
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}
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}
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}
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static void checkExceptionNotNull(boolean enabled, Object exception) {
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if (enabled && exception == null) {
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fatal("exception must not be null");
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}
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}
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/**
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* Determines if either Java assertions are enabled for Graal or if this is a HotSpot build
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* where the ASSERT mechanism is enabled.
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*/
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@Fold
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@SuppressWarnings("all")
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static boolean assertionsEnabled(@InjectedParameter GraalHotSpotVMConfig config) {
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return Assertions.assertionsEnabled() || cAssertionsEnabled(config);
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}
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public static final ForeignCallDescriptor EXCEPTION_HANDLER_FOR_PC = newDescriptor(ExceptionHandlerStub.class, "exceptionHandlerForPc", Word.class, Word.class);
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@NodeIntrinsic(value = StubForeignCallNode.class)
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public static native Word exceptionHandlerForPc(@ConstantNodeParameter ForeignCallDescriptor exceptionHandlerForPc, Word thread);
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}
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