Mercurial > hg > graal-compiler
view graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLRepeatingNode.java @ 19312:a8d128366ebf
Merge
author | Andreas Woess <andreas.woess@jku.at> |
---|---|
date | Thu, 12 Feb 2015 04:01:46 +0100 |
parents | 87ea195b66ff |
children | 3844fb65016c |
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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.*; public final class SLRepeatingNode extends Node implements RepeatingNode { /** * The condition of the loop. 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 as long as the condition is true. */ @Child private SLStatementNode bodyNode; /** * Profiling information, collected by the interpreter, capturing whether a {@code continue} * statement was used in this loop. This allows the compiler to generate better code for loops * without a {@code continue}. */ private final BranchProfile continueTaken = BranchProfile.create(); private final BranchProfile breakTaken = BranchProfile.create(); public SLRepeatingNode(SourceSection src, SLExpressionNode conditionNode, SLStatementNode bodyNode) { super(src); this.conditionNode = conditionNode; this.bodyNode = bodyNode; } public boolean executeRepeating(VirtualFrame frame) { if (evaluateCondition(frame)) { try { /* Execute the loop body. */ bodyNode.executeVoid(frame); } catch (SLContinueException ex) { /* In the interpreter, record profiling information that the loop uses continue. */ continueTaken.enter(); /* Fall through to next loop iteration. */ } catch (SLBreakException ex) { /* In the interpreter, record profiling information that the loop uses break. */ breakTaken.enter(); /* Done executing this loop, exit method to execute statement following the loop. */ return false; } return true; } else { return false; } } 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()); } } }