Mercurial > hg > graal-compiler
view graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLWhileNode.java @ 13918:22bf5a8ba9eb
Ruby: restore prototype debugger.
author | Chris Seaton <chris.seaton@oracle.com> |
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date | Mon, 10 Feb 2014 03:39:21 +0000 |
parents | afd6fa5e8229 |
children | a08b8694f556 |
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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.*; 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 final class SLWhileNode extends SLStatementNode { /** * 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 {@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 = new BranchProfile(); private final BranchProfile breakTaken = new BranchProfile(); public SLWhileNode(SLExpressionNode conditionNode, SLStatementNode bodyNode) { /* * It is a Truffle requirement to call adoptChild(), which performs all the necessary steps * to add the new child to the node tree. */ this.conditionNode = adoptChild(conditionNode); this.bodyNode = adoptChild(bodyNode); } @Override public void executeVoid(VirtualFrame frame) { int count = 0; try { while (evaluateCondition(frame)) { try { /* Execute the loop body. */ bodyNode.executeVoid(frame); if (CompilerDirectives.inInterpreter()) { /* In the interpreter, profile the the number of loop iteration. */ count++; } } 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. */ } finally { if (CompilerDirectives.inInterpreter()) { /* * In the interpreter, report the loop count to the Truffle system. It is used for * compilation and inlining decisions. */ getRootNode().reportLoopCount(count); } } } 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()); } } }