| /* |
| * 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.replacements; |
| |
| import static org.graalvm.compiler.hotspot.meta.HotSpotForeignCallsProviderImpl.LOAD_AND_CLEAR_EXCEPTION; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.EXCEPTION_OOP_LOCATION; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.EXCEPTION_PC_LOCATION; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.readExceptionOop; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.registerAsWord; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.writeExceptionOop; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.writeExceptionPc; |
| import static org.graalvm.compiler.nodes.PiNode.piCast; |
| import static org.graalvm.compiler.replacements.SnippetTemplate.DEFAULT_REPLACER; |
| |
| import org.graalvm.compiler.api.replacements.Snippet; |
| import org.graalvm.compiler.api.replacements.Snippet.ConstantParameter; |
| import org.graalvm.compiler.core.common.type.StampFactory; |
| import org.graalvm.compiler.hotspot.meta.HotSpotProviders; |
| import org.graalvm.compiler.hotspot.meta.HotSpotRegistersProvider; |
| import org.graalvm.compiler.nodes.StructuredGraph; |
| import org.graalvm.compiler.nodes.extended.ForeignCallNode; |
| import org.graalvm.compiler.nodes.java.LoadExceptionObjectNode; |
| import org.graalvm.compiler.nodes.spi.LoweringTool; |
| import org.graalvm.compiler.replacements.SnippetTemplate.AbstractTemplates; |
| import org.graalvm.compiler.replacements.SnippetTemplate.Arguments; |
| import org.graalvm.compiler.replacements.SnippetTemplate.SnippetInfo; |
| import org.graalvm.compiler.replacements.Snippets; |
| import org.graalvm.compiler.replacements.nodes.ReadRegisterNode; |
| import org.graalvm.compiler.word.Word; |
| |
| import jdk.vm.ci.code.BytecodeFrame; |
| import jdk.vm.ci.code.Register; |
| import jdk.vm.ci.code.TargetDescription; |
| |
| /** |
| * Snippet for loading the exception object at the start of an exception dispatcher. |
| * <p> |
| * The frame state upon entry to an exception handler is such that it is a |
| * {@link BytecodeFrame#rethrowException rethrow exception} state and the stack contains exactly the |
| * exception object (per the JVM spec) to rethrow. This means that the code generated for this node |
| * must not cause a deoptimization as the runtime/interpreter would not have a valid location to |
| * find the exception object to be rethrown. |
| */ |
| public class LoadExceptionObjectSnippets implements Snippets { |
| |
| /** |
| * Alternative way to implement exception object loading. |
| */ |
| private static final boolean USE_C_RUNTIME = HotspotSnippetsOptions.LoadExceptionObjectInVM.getValue(); |
| |
| @Snippet |
| public static Object loadException(@ConstantParameter Register threadRegister) { |
| Word thread = registerAsWord(threadRegister); |
| Object exception = readExceptionOop(thread); |
| writeExceptionOop(thread, null); |
| writeExceptionPc(thread, Word.zero()); |
| return piCast(exception, StampFactory.forNodeIntrinsic()); |
| } |
| |
| public static class Templates extends AbstractTemplates { |
| |
| private final SnippetInfo loadException = snippet(LoadExceptionObjectSnippets.class, "loadException", EXCEPTION_OOP_LOCATION, EXCEPTION_PC_LOCATION); |
| |
| public Templates(HotSpotProviders providers, TargetDescription target) { |
| super(providers, providers.getSnippetReflection(), target); |
| } |
| |
| public void lower(LoadExceptionObjectNode loadExceptionObject, HotSpotRegistersProvider registers, LoweringTool tool) { |
| if (USE_C_RUNTIME) { |
| StructuredGraph graph = loadExceptionObject.graph(); |
| ReadRegisterNode thread = graph.add(new ReadRegisterNode(registers.getThreadRegister(), true, false)); |
| graph.addBeforeFixed(loadExceptionObject, thread); |
| ForeignCallNode loadExceptionC = graph.add(new ForeignCallNode(providers.getForeignCalls(), LOAD_AND_CLEAR_EXCEPTION, thread)); |
| loadExceptionC.setStateAfter(loadExceptionObject.stateAfter()); |
| graph.replaceFixedWithFixed(loadExceptionObject, loadExceptionC); |
| } else { |
| Arguments args = new Arguments(loadException, loadExceptionObject.graph().getGuardsStage(), tool.getLoweringStage()); |
| args.addConst("threadRegister", registers.getThreadRegister()); |
| template(args).instantiate(providers.getMetaAccess(), loadExceptionObject, DEFAULT_REPLACER, args); |
| } |
| } |
| } |
| } |