Mercurial > hg > truffle
view graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/replacements/ReflectionGetCallerClassNode.java @ 15489:d0e3f6963ed7
mx: made parallel Java builds interact correctly with management of subprocesses upon abort/quit
author | Doug Simon <doug.simon@oracle.com> |
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date | Sun, 04 May 2014 01:26:50 +0200 |
parents | 96bb07a5d667 |
children | c5b2a3c22318 |
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/* * Copyright (c) 2013, 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 com.oracle.graal.hotspot.replacements; import static com.oracle.graal.compiler.GraalCompiler.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.compiler.common.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.hotspot.meta.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.replacements.nodes.*; public class ReflectionGetCallerClassNode extends MacroNode implements Canonicalizable, Lowerable { public ReflectionGetCallerClassNode(Invoke invoke) { super(invoke); } @Override public Node canonical(CanonicalizerTool tool) { ConstantNode callerClassNode = getCallerClassNode(tool.getMetaAccess()); if (callerClassNode != null) { return callerClassNode; } return this; } @Override public void lower(LoweringTool tool) { ConstantNode callerClassNode = getCallerClassNode(tool.getMetaAccess()); if (callerClassNode != null) { graph().replaceFixedWithFloating(this, callerClassNode); } else { InvokeNode invoke = createInvoke(); graph().replaceFixedWithFixed(this, invoke); invoke.lower(tool); } } /** * If inlining is deep enough this method returns a {@link ConstantNode} of the caller class by * walking the the stack. * * @param metaAccess * @return ConstantNode of the caller class, or null */ private ConstantNode getCallerClassNode(MetaAccessProvider metaAccess) { if (!shouldIntrinsify(getTargetMethod())) { return null; } // Walk back up the frame states to find the caller at the required depth. FrameState state = stateAfter(); // Cf. JVM_GetCallerClass // NOTE: Start the loop at depth 1 because the current frame state does // not include the Reflection.getCallerClass() frame. for (int n = 1; state != null; state = state.outerFrameState(), n++) { HotSpotResolvedJavaMethod method = (HotSpotResolvedJavaMethod) state.method(); switch (n) { case 0: throw GraalInternalError.shouldNotReachHere("current frame state does not include the Reflection.getCallerClass frame"); case 1: // Frame 0 and 1 must be caller sensitive (see JVM_GetCallerClass). if (!method.isCallerSensitive()) { return null; // bail-out; let JVM_GetCallerClass do the work } break; default: if (!method.ignoredBySecurityStackWalk()) { // We have reached the desired frame; return the holder class. HotSpotResolvedObjectType callerClass = method.getDeclaringClass(); return ConstantNode.forConstant(HotSpotObjectConstant.forObject(callerClass.mirror()), metaAccess, graph()); } break; } } return null; // bail-out; let JVM_GetCallerClass do the work } }