Mercurial > hg > truffle
view graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/RootNode.java @ 18311:3343ed66de79
Truffle: RootNode#getExecutionContext.
author | Chris Seaton <chris.seaton@oracle.com> |
---|---|
date | Sun, 09 Nov 2014 00:54:15 +0000 |
parents | be1316e633b5 |
children | 656331a61829 |
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/* * Copyright (c) 2012, 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. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * 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.truffle.api.nodes; import com.oracle.truffle.api.*; import com.oracle.truffle.api.CompilerDirectives.CompilationFinal; import com.oracle.truffle.api.frame.*; import com.oracle.truffle.api.source.*; /** * A root node is a node with a method to execute it given only a frame as a parameter. Therefore, a * root node can be used to create a call target using * {@link TruffleRuntime#createCallTarget(RootNode)}. */ public abstract class RootNode extends Node { private RootCallTarget callTarget; @CompilationFinal private FrameDescriptor frameDescriptor; protected RootNode() { this(null, null); } protected RootNode(SourceSection sourceSection) { this(sourceSection, null); } protected RootNode(SourceSection sourceSection, FrameDescriptor frameDescriptor) { super(sourceSection); if (frameDescriptor == null) { this.frameDescriptor = new FrameDescriptor(); } else { this.frameDescriptor = frameDescriptor; } } @Override public Node copy() { RootNode root = (RootNode) super.copy(); root.frameDescriptor = frameDescriptor; return root; } /** * Returns <code>true</code> if this {@link RootNode} is allowed to be cloned. The runtime * system might decide to create deep copies of the {@link RootNode} in order to gather context * sensitive profiling feedback. The default implementation returns <code>false</code>. Guest * language specific implementations may want to return <code>true</code> here to indicate that * gathering call site specific profiling information might make sense for this {@link RootNode} * . * * @return <code>true</code> if cloning is allowed else <code>false</code>. */ public boolean isCloningAllowed() { return false; } /** * Reports the execution count of a loop that is a child of this node. The optimization * heuristics can use the loop count to guide compilation and inlining. */ public final void reportLoopCount(int count) { if (getCallTarget() instanceof LoopCountReceiver) { ((LoopCountReceiver) getCallTarget()).reportLoopCount(count); } } /** * Executes this function using the specified frame and returns the result value. * * @param frame the frame of the currently executing guest language method * @return the value of the execution */ public abstract Object execute(VirtualFrame frame); public final RootCallTarget getCallTarget() { return callTarget; } public final FrameDescriptor getFrameDescriptor() { return frameDescriptor; } public final void setCallTarget(RootCallTarget callTarget) { this.callTarget = callTarget; } /** * Returns the {@link ExecutionContext} associated with this <code>RootNode</code>. This allows * the correct <code>ExecutionContext</code> to be determined for a <code>RootNode</code> (and * so also for a {@link RootCallTarget} and a {@link FrameInstance} obtained from the call * stack) without prior knowledge of the language it has come from. * * Used for instance to determine the language of a <code>RootNode<code>: * * <pre> * <code> * rootNode.getExecutionContext().getLanguageShortName(); * </code> </pre> * * Returns <code>null</code> by default. */ public ExecutionContext getExecutionContext() { return null; } }