Mercurial > hg > truffle
view graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLWhileNode.java @ 13821:b16ec83edc73
Documentation and more refactoring of Simple Language
author | Christian Wimmer <christian.wimmer@oracle.com> |
---|---|
date | Wed, 29 Jan 2014 20:45:43 -0800 |
parents | 7c418666c6c9 |
children | 64c77f0577bb |
line wrap: on
line source
/* * 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.*; import com.oracle.truffle.api.dsl.*; import com.oracle.truffle.api.frame.*; import com.oracle.truffle.api.nodes.*; import com.oracle.truffle.api.utilities.*; import com.oracle.truffle.sl.nodes.*; @NodeInfo(shortName = "while") public class SLWhileNode extends SLStatementNode { @Child private SLExpressionNode conditionNode; @Child private SLStatementNode bodyNode; private final BranchProfile continueTaken = new BranchProfile(); private final BranchProfile breakTaken = new BranchProfile(); public SLWhileNode(SLExpressionNode conditionNode, SLStatementNode bodyNode) { this.conditionNode = adoptChild(conditionNode); this.bodyNode = adoptChild(bodyNode); } @Override public void executeVoid(VirtualFrame frame) { int count = 0; try { while (evaluateCondition(frame)) { try { bodyNode.executeVoid(frame); if (CompilerDirectives.inInterpreter()) { count++; } } catch (SLContinueException ex) { continueTaken.enter(); /* Fall through to next loop iteration. */ } } } catch (SLBreakException ex) { breakTaken.enter(); /* Done executing this loop, exit method to execute statement following the loop. */ } finally { if (CompilerDirectives.inInterpreter()) { /* * Report the loop count to the Truffle system. It is used for compilation and * inlining decisions. */ RootNode root = getRootNode(); if (root.getCallTarget() instanceof LoopCountReceiver) { ((LoopCountReceiver) root.getCallTarget()).reportLoopCount(count); } } } } private boolean evaluateCondition(VirtualFrame frame) { try { /* * The condition must evaluate to a boolean value, so we call boolean-specialized * 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, ex.getResult()); } } }