Mercurial > jdk8-mips64-public > nashorn / annotate
src/jdk/nashorn/internal/ir/TypeOverride.java@d28180d97c61 (annotated)
src/jdk/nashorn/internal/ir/TypeOverride.java
Wed, 08 May 2013 15:51:36 +0200
- author
- attila
- date
- Wed, 08 May 2013 15:51:36 +0200
- changeset 254
- d28180d97c61
- parent 144
- 4be452026847
- permissions
- -rw-r--r--
8013912: Nashorn needs to reuse temporary symbols
Reviewed-by: jlaskey, lagergren
| jlaskey@3 | 1 | /* |
| jlaskey@7 | 2 | * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
| jlaskey@3 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| jlaskey@3 | 4 | * |
| jlaskey@3 | 5 | * This code is free software; you can redistribute it and/or modify it |
| jlaskey@3 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| jlaskey@3 | 7 | * published by the Free Software Foundation. Oracle designates this |
| jlaskey@3 | 8 | * particular file as subject to the "Classpath" exception as provided |
| jlaskey@3 | 9 | * by Oracle in the LICENSE file that accompanied this code. |
| jlaskey@3 | 10 | * |
| jlaskey@3 | 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| jlaskey@3 | 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| jlaskey@3 | 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| jlaskey@3 | 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| jlaskey@3 | 15 | * accompanied this code). |
| jlaskey@3 | 16 | * |
| jlaskey@3 | 17 | * You should have received a copy of the GNU General Public License version |
| jlaskey@3 | 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| jlaskey@3 | 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| jlaskey@3 | 20 | * |
| jlaskey@3 | 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| jlaskey@3 | 22 | * or visit www.oracle.com if you need additional information or have any |
| jlaskey@3 | 23 | * questions. |
| jlaskey@3 | 24 | */ |
| jlaskey@3 | 25 | |
| jlaskey@3 | 26 | package jdk.nashorn.internal.ir; |
| jlaskey@3 | 27 | |
| jlaskey@3 | 28 | import jdk.nashorn.internal.codegen.types.Type; |
| jlaskey@3 | 29 | |
| jlaskey@3 | 30 | /** |
| jlaskey@3 | 31 | * A type override makes it possible to change the return type of a node, if we know |
| jlaskey@3 | 32 | * that the linker can provide it directly. For example, an identity node that is |
| jlaskey@3 | 33 | * in the scope, can very well look like an object to the compiler of the method it |
| jlaskey@3 | 34 | * is in, but if someone does (int)x, it make senses to ask for it directly |
| jlaskey@3 | 35 | * with an int getter instead of loading it as an object and explicitly converting it |
| jlaskey@3 | 36 | * by using JSType.toInt32. Especially in scenarios where the field is already stored |
| jlaskey@3 | 37 | * as a primitive, this will be much faster than the "object is all I see" scope |
| jlaskey@3 | 38 | * available in the method |
| attila@144 | 39 | * @param <T> the type of the node implementing the interface |
| jlaskey@3 | 40 | */ |
| jlaskey@3 | 41 | |
| attila@144 | 42 | public interface TypeOverride<T extends Node> { |
| jlaskey@3 | 43 | /** |
| jlaskey@3 | 44 | * Set the override type |
| jlaskey@3 | 45 | * |
| attila@254 | 46 | * @param ts temporary symbols |
| attila@254 | 47 | * @param lc the current lexical context |
| attila@254 | 48 | * @param type the type |
| attila@144 | 49 | * @return a node equivalent to this one except for the requested change. |
| jlaskey@3 | 50 | */ |
| attila@254 | 51 | public T setType(final TemporarySymbols ts, final LexicalContext lc, final Type type); |
| jlaskey@3 | 52 | |
| jlaskey@3 | 53 | /** |
| jlaskey@3 | 54 | * Returns true if this node can have a callsite override, e.g. all scope ident nodes |
| jlaskey@3 | 55 | * which lead to dynamic getters can have it, local variable nodes (slots) can't. |
| jlaskey@3 | 56 | * Call nodes can have it unconditionally and so on |
| jlaskey@3 | 57 | * |
| jlaskey@3 | 58 | * @return true if it is possible to assign a type override to this node |
| jlaskey@3 | 59 | */ |
| jlaskey@3 | 60 | public boolean canHaveCallSiteType(); |
| jlaskey@3 | 61 | |
| jlaskey@3 | 62 | } |
