diff options
Diffstat (limited to 'src/jdk/nashorn/internal/ir/SplitReturn.java')
-rw-r--r-- | src/jdk/nashorn/internal/ir/SplitReturn.java | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/src/jdk/nashorn/internal/ir/SplitReturn.java b/src/jdk/nashorn/internal/ir/SplitReturn.java new file mode 100644 index 00000000..fb1b58c7 --- /dev/null +++ b/src/jdk/nashorn/internal/ir/SplitReturn.java @@ -0,0 +1,64 @@ +/* + * Copyright (c) 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. Oracle designates this + * particular file as subject to the "Classpath" exception as provided + * by Oracle in the LICENSE file that accompanied this code. + * + * 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 jdk.nashorn.internal.ir; + +import jdk.nashorn.internal.ir.visitor.NodeVisitor; + +/** + * Synthetic AST node that represents return from a split fragment of a split function for control flow reasons (break + * or continue into a target outside the current fragment). It has no JavaScript source representation and only occurs + * in synthetic functions created by the split-into-functions transformation. It is different from a return node in + * that the return value is irrelevant, and doesn't affect the function's return type calculation. + */ +public final class SplitReturn extends Statement { + private static final long serialVersionUID = 1L; + + /** The sole instance of this AST node. */ + public static final SplitReturn INSTANCE = new SplitReturn(); + + private SplitReturn() { + super(NO_LINE_NUMBER, NO_TOKEN, NO_FINISH); + } + + @Override + public boolean isTerminal() { + return true; + } + + @Override + public Node accept(final NodeVisitor<? extends LexicalContext> visitor) { + return visitor.enterSplitReturn(this) ? visitor.leaveSplitReturn(this) : this; + } + + @Override + public void toString(StringBuilder sb, boolean printType) { + sb.append(":splitreturn;"); + } + + private Object readResolve() { + return INSTANCE; + } +} |