/* * Copyright (c) 2015, 2018, 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.meta; import static jdk.vm.ci.meta.DeoptimizationAction.None; import static jdk.vm.ci.meta.DeoptimizationReason.TransferToInterpreter; import static org.graalvm.compiler.core.common.GraalOptions.ImmutableCode; import java.lang.reflect.Field; import org.graalvm.compiler.core.common.CompilationIdentifier; import org.graalvm.compiler.core.common.type.StampFactory; import org.graalvm.compiler.core.common.type.StampPair; import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig; import org.graalvm.compiler.hotspot.HotSpotCompilationIdentifier; import org.graalvm.compiler.hotspot.nodes.CurrentJavaThreadNode; import org.graalvm.compiler.hotspot.word.HotSpotWordTypes; import org.graalvm.compiler.nodes.ConstantNode; import org.graalvm.compiler.nodes.FixedGuardNode; import org.graalvm.compiler.nodes.FixedWithNextNode; import org.graalvm.compiler.nodes.LogicNode; import org.graalvm.compiler.nodes.NamedLocationIdentity; import org.graalvm.compiler.nodes.StructuredGraph; import org.graalvm.compiler.nodes.ValueNode; import org.graalvm.compiler.nodes.calc.IntegerEqualsNode; import org.graalvm.compiler.nodes.extended.GuardingNode; import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderContext; import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderTool; import org.graalvm.compiler.nodes.graphbuilderconf.InlineInvokePlugin; import org.graalvm.compiler.nodes.graphbuilderconf.NodePlugin; import org.graalvm.compiler.nodes.graphbuilderconf.TypePlugin; import org.graalvm.compiler.nodes.memory.HeapAccess.BarrierType; import org.graalvm.compiler.nodes.memory.ReadNode; import org.graalvm.compiler.nodes.memory.address.AddressNode; import org.graalvm.compiler.nodes.memory.address.OffsetAddressNode; import org.graalvm.compiler.nodes.util.ConstantFoldUtil; import org.graalvm.compiler.word.Word; import org.graalvm.compiler.word.WordOperationPlugin; import jdk.internal.vm.compiler.word.LocationIdentity; import jdk.vm.ci.hotspot.HotSpotCompilationRequest; import jdk.vm.ci.meta.JavaConstant; import jdk.vm.ci.meta.JavaKind; import jdk.vm.ci.meta.JavaType; import jdk.vm.ci.meta.JavaTypeProfile; import jdk.vm.ci.meta.ResolvedJavaField; import jdk.vm.ci.meta.ResolvedJavaMethod; import jdk.vm.ci.meta.ResolvedJavaType; import sun.misc.Unsafe; /** * This plugin does HotSpot-specific customization of bytecode parsing: * */ public final class HotSpotNodePlugin implements NodePlugin, TypePlugin { protected final WordOperationPlugin wordOperationPlugin; private final GraalHotSpotVMConfig config; private final HotSpotWordTypes wordTypes; public HotSpotNodePlugin(WordOperationPlugin wordOperationPlugin, GraalHotSpotVMConfig config, HotSpotWordTypes wordTypes) { this.wordOperationPlugin = wordOperationPlugin; this.config = config; this.wordTypes = wordTypes; } @Override public boolean canChangeStackKind(GraphBuilderContext b) { if (b.parsingIntrinsic()) { return wordOperationPlugin.canChangeStackKind(b); } return false; } @Override public StampPair interceptType(GraphBuilderTool b, JavaType declaredType, boolean nonNull) { if (b.parsingIntrinsic()) { return wordOperationPlugin.interceptType(b, declaredType, nonNull); } return null; } @Override public boolean handleInvoke(GraphBuilderContext b, ResolvedJavaMethod method, ValueNode[] args) { if (b.parsingIntrinsic() && wordOperationPlugin.handleInvoke(b, method, args)) { return true; } return false; } @Override public boolean handleLoadField(GraphBuilderContext b, ValueNode object, ResolvedJavaField field) { if (!ImmutableCode.getValue(b.getOptions()) || b.parsingIntrinsic()) { if (object.isConstant()) { JavaConstant asJavaConstant = object.asJavaConstant(); if (tryReadField(b, field, asJavaConstant)) { return true; } } } if (b.parsingIntrinsic() && wordOperationPlugin.handleLoadField(b, object, field)) { return true; } return false; } @Override public boolean handleLoadStaticField(GraphBuilderContext b, ResolvedJavaField field) { if (!ImmutableCode.getValue(b.getOptions()) || b.parsingIntrinsic()) { if (tryReadField(b, field, null)) { return true; } } if (b.parsingIntrinsic() && wordOperationPlugin.handleLoadStaticField(b, field)) { return true; } return false; } private static boolean tryReadField(GraphBuilderContext b, ResolvedJavaField field, JavaConstant object) { return tryConstantFold(b, field, object); } private static boolean tryConstantFold(GraphBuilderContext b, ResolvedJavaField field, JavaConstant object) { ConstantNode result = ConstantFoldUtil.tryConstantFold(b.getConstantFieldProvider(), b.getConstantReflection(), b.getMetaAccess(), field, object, b.getOptions()); if (result != null) { result = b.getGraph().unique(result); b.push(field.getJavaKind(), result); return true; } return false; } @Override public boolean handleStoreField(GraphBuilderContext b, ValueNode object, ResolvedJavaField field, ValueNode value) { if (b.parsingIntrinsic() && wordOperationPlugin.handleStoreField(b, object, field, value)) { return true; } return false; } @Override public boolean handleStoreStaticField(GraphBuilderContext b, ResolvedJavaField field, ValueNode value) { if (b.parsingIntrinsic() && wordOperationPlugin.handleStoreStaticField(b, field, value)) { return true; } return false; } @Override public boolean handleLoadIndexed(GraphBuilderContext b, ValueNode array, ValueNode index, GuardingNode boundsCheck, JavaKind elementKind) { if (b.parsingIntrinsic() && wordOperationPlugin.handleLoadIndexed(b, array, index, boundsCheck, elementKind)) { return true; } return false; } @Override public boolean handleStoreIndexed(GraphBuilderContext b, ValueNode array, ValueNode index, GuardingNode boundsCheck, GuardingNode storeCheck, JavaKind elementKind, ValueNode value) { if (b.parsingIntrinsic() && wordOperationPlugin.handleStoreIndexed(b, array, index, boundsCheck, storeCheck, elementKind, value)) { return true; } return false; } @Override public boolean handleCheckCast(GraphBuilderContext b, ValueNode object, ResolvedJavaType type, JavaTypeProfile profile) { if (b.parsingIntrinsic() && wordOperationPlugin.handleCheckCast(b, object, type, profile)) { return true; } return false; } @Override public boolean handleInstanceOf(GraphBuilderContext b, ValueNode object, ResolvedJavaType type, JavaTypeProfile profile) { if (b.parsingIntrinsic() && wordOperationPlugin.handleInstanceOf(b, object, type, profile)) { return true; } return false; } @Override public FixedWithNextNode instrumentExceptionDispatch(StructuredGraph graph, FixedWithNextNode afterExceptionLoaded) { CompilationIdentifier id = graph.compilationId(); if (id instanceof HotSpotCompilationIdentifier) { HotSpotCompilationRequest request = ((HotSpotCompilationIdentifier) id).getRequest(); if (request != null) { long compileState = request.getJvmciEnv(); if (compileState != 0 && config.jvmciCompileStateCanPostOnExceptionsOffset != Integer.MIN_VALUE && config.javaThreadShouldPostOnExceptionsFlagOffset != Integer.MIN_VALUE) { long canPostOnExceptionsOffset = compileState + config.jvmciCompileStateCanPostOnExceptionsOffset; boolean canPostOnExceptions = UNSAFE.getByte(canPostOnExceptionsOffset) != 0; if (canPostOnExceptions) { // If the exception capability is set, then generate code // to check the JavaThread.should_post_on_exceptions flag to see // if we actually need to report exception events for the current // thread. If not, take the fast path otherwise deoptimize. CurrentJavaThreadNode thread = graph.unique(new CurrentJavaThreadNode(wordTypes.getWordKind())); ValueNode offset = graph.unique(ConstantNode.forLong(config.javaThreadShouldPostOnExceptionsFlagOffset)); AddressNode address = graph.unique(new OffsetAddressNode(thread, offset)); ReadNode shouldPostException = graph.add(new ReadNode(address, JAVA_THREAD_SHOULD_POST_ON_EXCEPTIONS_FLAG_LOCATION, StampFactory.intValue(), BarrierType.NONE)); afterExceptionLoaded.setNext(shouldPostException); ValueNode zero = graph.unique(ConstantNode.forInt(0)); LogicNode cond = graph.unique(new IntegerEqualsNode(shouldPostException, zero)); FixedGuardNode check = graph.add(new FixedGuardNode(cond, TransferToInterpreter, None, false)); shouldPostException.setNext(check); return check; } } } } return afterExceptionLoaded; } private static final LocationIdentity JAVA_THREAD_SHOULD_POST_ON_EXCEPTIONS_FLAG_LOCATION = NamedLocationIdentity.mutable("JavaThread::_should_post_on_exceptions_flag"); static final Unsafe UNSAFE = initUnsafe(); static Unsafe initUnsafe() { try { // Fast path when we are trusted. return Unsafe.getUnsafe(); } catch (SecurityException se) { // Slow path when we are not trusted. try { Field theUnsafe = Unsafe.class.getDeclaredField("theUnsafe"); theUnsafe.setAccessible(true); return (Unsafe) theUnsafe.get(Unsafe.class); } catch (Exception e) { throw new RuntimeException("exception while trying to get Unsafe", e); } } } }