Mercurial > hg > graal-compiler
view graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLIfNode.java @ 18125:2a69cbe850a8
Reduce diff with upstream
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Mon, 20 Oct 2014 19:07:20 +0200 |
parents | fa5e62620593 |
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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.controlflow; import com.oracle.truffle.api.dsl.*; import com.oracle.truffle.api.frame.*; import com.oracle.truffle.api.nodes.*; import com.oracle.truffle.api.source.*; import com.oracle.truffle.api.utilities.*; import com.oracle.truffle.sl.nodes.*; @NodeInfo(shortName = "if", description = "The node implementing a condional statement") public final class SLIfNode extends SLStatementNode { /** * The condition of the {@code if}. This in a {@link SLExpressionNode} because we require a * result value. We do not have a node type that can only return a {@code boolean} value, so * {@link #evaluateCondition executing the condition} can lead to a type error. */ @Child private SLExpressionNode conditionNode; /** Statement (or {@link SLBlockNode block}) executed when the condition is true. */ @Child private SLStatementNode thenPartNode; /** Statement (or {@link SLBlockNode block}) executed when the condition is false. */ @Child private SLStatementNode elsePartNode; /** * Profiling information, collected by the interpreter, capturing the profiling information of * the condition. This allows the compiler to generate better code for conditions that are * always true or always false. Additionally the {@link CountingConditionProfile} implementation * (as opposed to {@link BinaryConditionProfile} implementation) transmits the probability of * the condition to be true to the compiler. */ private final ConditionProfile condition = ConditionProfile.createCountingProfile(); public SLIfNode(SourceSection src, SLExpressionNode conditionNode, SLStatementNode thenPartNode, SLStatementNode elsePartNode) { super(src); this.conditionNode = conditionNode; this.thenPartNode = thenPartNode; this.elsePartNode = elsePartNode; } @Override public void executeVoid(VirtualFrame frame) { /* * In the interpreter, record profiling information that the condition was executed and with * which outcome. */ if (condition.profile(evaluateCondition(frame))) { /* Execute the then-branch. */ thenPartNode.executeVoid(frame); } else { /* Execute the else-branch (which is optional according to the SL syntax). */ if (elsePartNode != null) { elsePartNode.executeVoid(frame); } } } private boolean evaluateCondition(VirtualFrame frame) { try { /* * The condition must evaluate to a boolean value, so we call the boolean-specialized * execute method. */ return conditionNode.executeBoolean(frame); } catch (UnexpectedResultException ex) { /* * The condition evaluated to a non-boolean result. This is a type error in the SL * program. We report it with the same exception that Truffle DSL generated nodes use to * report type errors. */ throw new UnsupportedSpecializationException(this, new Node[]{conditionNode}, ex.getResult()); } } }