Mercurial > hg > graal-compiler
view graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/local/SLReadArgumentNode.java @ 13931:ce73694346b2
minor assembly tweaks
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Tue, 11 Feb 2014 10:37:28 -0800 |
parents | afd6fa5e8229 |
children | 64dcb92ee75a |
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/* * Copyright (c) 2012, 2014, 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.truffle.sl.nodes.local; import com.oracle.truffle.api.*; import com.oracle.truffle.api.frame.*; import com.oracle.truffle.api.utilities.*; import com.oracle.truffle.sl.nodes.*; import com.oracle.truffle.sl.parser.*; import com.oracle.truffle.sl.runtime.*; /** * Reads a function argument. Arguments are passed in as a {@link SLArguments} object, which * encapsulates an {@link SLArguments#getFromFrame Object[] array}. Language-defined subclasses of * {@link Arguments} are the standard Truffle way to pass values between functions. * <p> * Arguments are not type-specialized. To ensure that repeated accesses within a method are * specialized and can, e.g., be accessed without unboxing, all arguments are loaded into local * variables {@link SLNodeFactory#addFormalParameter in the method prologue}. */ public class SLReadArgumentNode extends SLExpressionNode { /** The argument number, i.e., the index into the array of arguments. */ private final int index; /** * Profiling information, collected by the interpreter, capturing whether the function was * called with fewer actual arguments than formal arguments. */ private final BranchProfile outOfBoundsTaken = new BranchProfile(); public SLReadArgumentNode(int index) { this.index = index; } @Override public Object executeGeneric(VirtualFrame frame) { Object[] args = SLArguments.getFromFrame(frame); if (index < args.length) { return args[index]; } else { /* In the interpreter, record profiling information that the branch was used. */ outOfBoundsTaken.enter(); /* Use the default null value. */ return SLNull.SINGLETON; } } }