Mercurial > hg > graal-jvmci-8
comparison graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/call/SLUninitializedDispatchNode.java @ 13821:b16ec83edc73
Documentation and more refactoring of Simple Language
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Wed, 29 Jan 2014 20:45:43 -0800 |
parents | graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/call/SLUninitializedCallNode.java@533b21375e58 |
children | 64c77f0577bb |
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13820:20e7727588e8 | 13821:b16ec83edc73 |
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1 /* | |
2 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 */ | |
23 package com.oracle.truffle.sl.nodes.call; | |
24 | |
25 import com.oracle.truffle.api.*; | |
26 import com.oracle.truffle.api.frame.*; | |
27 import com.oracle.truffle.api.nodes.*; | |
28 import com.oracle.truffle.sl.*; | |
29 import com.oracle.truffle.sl.runtime.*; | |
30 | |
31 /** | |
32 * The last entry of a polymorphic inline cache. | |
33 */ | |
34 final class SLUninitializedDispatchNode extends SLAbstractDispatchNode { | |
35 | |
36 /** | |
37 * When we reach this method, all the previous cache entries did not match the function. If the | |
38 * cache is still small enough, we extend it by adding another {@link SLDirectDispatchNode}. If | |
39 * the cache reached its maximum size, we replace the whole dispatch chain with a | |
40 * {@link SLGenericDispatchNode}. | |
41 */ | |
42 @Override | |
43 protected Object executeDispatch(VirtualFrame frame, SLFunction function, SLArguments arguments) { | |
44 /* The following code modifies the AST, so compiled code must be invalidated. */ | |
45 CompilerDirectives.transferToInterpreterAndInvalidate(); | |
46 | |
47 /* | |
48 * Count the number of SLDirectDispatchNodes we already have in the cache. We walk the chain | |
49 * of parent nodes until we hit the SLCallNode. We know that a SLCallNode is always present. | |
50 */ | |
51 Node cur = this; | |
52 int depth = 0; | |
53 while (cur.getParent() instanceof SLAbstractDispatchNode) { | |
54 cur = cur.getParent(); | |
55 depth++; | |
56 } | |
57 SLCallNode callNode = (SLCallNode) cur.getParent(); | |
58 | |
59 SLAbstractDispatchNode specialized; | |
60 if (function.getCallTarget() == null) { | |
61 /* Corner case: the function is not defined, so report an error to the user. */ | |
62 throw new SLException("Call of undefined function: " + function.getName()); | |
63 | |
64 } else if (depth < INLINE_CACHE_SIZE) { | |
65 /* Extend the inline cache. Allocate the new cache entry, and the new end of the cache. */ | |
66 SLAbstractDispatchNode next = new SLUninitializedDispatchNode(); | |
67 SLAbstractDispatchNode direct = new SLDirectDispatchNode(next, function); | |
68 /* Replace ourselfs with the new cache entry. */ | |
69 specialized = replace(direct); | |
70 | |
71 } else { | |
72 /* Cache size exceeded, fall back to a single generic dispatch node. */ | |
73 SLAbstractDispatchNode generic = new SLGenericDispatchNode(); | |
74 /* Replace the whole chain, not just ourselfs, with the new generic node. */ | |
75 specialized = callNode.dispatchNode.replace(generic); | |
76 } | |
77 | |
78 /* | |
79 * Execute the newly created node perform the actual dispatch. That saves us from | |
80 * duplicating the actual call logic here. | |
81 */ | |
82 return specialized.executeDispatch(frame, function, arguments); | |
83 } | |
84 } |