Mercurial > hg > graal-compiler
view graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/local/SLWriteLocalVariableNode.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 | 96bd95f62d92 |
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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.dsl.*; import com.oracle.truffle.api.frame.*; import com.oracle.truffle.sl.nodes.*; /** * Node to write a local variable to a function's {@link VirtualFrame frame}. The Truffle frame API * allows to store primitive values of all Java primitive types, and Object values. */ @NodeChild(value = "valueNode") @NodeField(name = "slot", type = FrameSlot.class) public abstract class SLWriteLocalVariableNode extends SLExpressionNode { /** * Returns the descriptor of the accessed local variable. The implementation of this method is * created by the Truffle DSL based on the {@link NodeField} annotation on the class. */ protected abstract FrameSlot getSlot(); /** * Specialized method to write a primitive {@code long} value. This is only possible if the * local variable also has currently the type {@code long}, therefore a Truffle DSL * {@link #isLongKind() custom guard} is specified. */ @Specialization(guards = "isLongKind") protected long write(VirtualFrame frame, long value) { frame.setLong(getSlot(), value); return value; } @Specialization(guards = "isBooleanKind") protected boolean write(VirtualFrame frame, boolean value) { frame.setBoolean(getSlot(), value); return value; } /** * Generic write method that works for all possible types. * <p> * Why is this method annotated with {@link Specialization} and not {@link Generic}? For a * {@link Generic} method, the Truffle DSL generated code would try all other specializations * first before calling this method. We know that all these specializations would fail their * guards, so there is no point in calling them. Since this method takes a value of type * {@link Object}, it is guaranteed to never fail, i.e., once we are in this specialization the * node will never be re-specialized. */ @Specialization protected Object write(VirtualFrame frame, Object value) { if (getSlot().getKind() != FrameSlotKind.Object) { /* * The local variable has still a primitive type, we need to change it to Object. Since * the variable type is important when the compiler optimizes a method, we also discard * compiled code. */ CompilerDirectives.transferToInterpreterAndInvalidate(); getSlot().setKind(FrameSlotKind.Object); } frame.setObject(getSlot(), value); return value; } /** * Guard function that the local variable has the type {@code long}. */ protected boolean isLongKind() { return isKind(FrameSlotKind.Long); } protected boolean isBooleanKind() { return isKind(FrameSlotKind.Boolean); } private boolean isKind(FrameSlotKind kind) { if (getSlot().getKind() == kind) { /* Success: the frame slot has the expected kind. */ return true; } else if (getSlot().getKind() == FrameSlotKind.Illegal) { /* * This is the first write to this local variable. We can set the type to the one we * expect. Since the variable type is important when the compiler optimizes a method, we * also discard compiled code. */ CompilerDirectives.transferToInterpreterAndInvalidate(); getSlot().setKind(kind); return true; } else { /* * Failure: the frame slot has the wrong kind, the Truffle DSL generated code will * choose a different specialization. */ return false; } } }