Mercurial > hg > truffle
diff truffle/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLFunctionBodyNode.java @ 21951:9c8c0937da41
Moving all sources into truffle subdirectory
author | Jaroslav Tulach <jaroslav.tulach@oracle.com> |
---|---|
date | Wed, 17 Jun 2015 10:58:08 +0200 |
parents | graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLFunctionBodyNode.java@87ea195b66ff |
children | c07e64ecb528 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/truffle/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLFunctionBodyNode.java Wed Jun 17 10:58:08 2015 +0200 @@ -0,0 +1,82 @@ +/* + * 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.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.*; +import com.oracle.truffle.sl.runtime.*; + +/** + * The body of a user-defined SL function. This is the node referenced by a {@link SLRootNode} for + * user-defined functions. It handles the return value of a function: the {@link SLReturnNode return + * statement} throws an {@link SLReturnException exception} with the return value. This node catches + * the exception. If the method ends without an explicit {@code return}, return the + * {@link SLNull#SINGLETON default null value}. + */ +@NodeInfo(shortName = "body") +public final class SLFunctionBodyNode extends SLExpressionNode { + + /** The body of the function. */ + @Child private SLStatementNode bodyNode; + + /** + * Profiling information, collected by the interpreter, capturing whether the function had an + * {@link SLReturnNode explicit return statement}. This allows the compiler to generate better + * code. + */ + private final BranchProfile exceptionTaken = BranchProfile.create(); + private final BranchProfile nullTaken = BranchProfile.create(); + + public SLFunctionBodyNode(SourceSection src, SLStatementNode bodyNode) { + super(src); + this.bodyNode = bodyNode; + } + + @Override + public Object executeGeneric(VirtualFrame frame) { + try { + /* Execute the function body. */ + bodyNode.executeVoid(frame); + + } catch (SLReturnException ex) { + /* + * In the interpreter, record profiling information that the function has an explicit + * return. + */ + exceptionTaken.enter(); + /* The exception transports the actual return value. */ + return ex.getResult(); + } + + /* + * In the interpreter, record profiling information that the function ends without an + * explicit return. + */ + nullTaken.enter(); + /* Return the default null value. */ + return SLNull.SINGLETON; + } +}