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;
+    }
+}