Mercurial > hg > graal-jvmci-8
comparison graal/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/nodes/SafeReplaceTest.java @ 18985:867058575979
Truffle: Improved support for "probing" AST nodes:
- Node.isSafelyReplacaeableBy(Node) checks in advance if Node.replace(Node) would be unsafe (crash the VM).
- Hoist Probe() from language imlementations into Node; now completely language agnostic.
- Language implementations support probing by implementing Node.isInstrumentable() and Node.createWrapperNode()
- Node.Probe() throws ProbeException (without side effects) if the probe fails.
-- ProbeException contains an instance of ProbeFailure that diagnoses the failure in detail
- Additional measures to prevent instrumentation from being applied to internal InstrumentationNodes.
- Promote ProbeListener to top level interface and add a default implementation
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Tue, 27 Jan 2015 20:24:54 -0800 |
parents | |
children | 67d9e635102f |
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18984:0f462015296f | 18985:867058575979 |
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1 /* | |
2 * Copyright (c) 2015, 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.api.test.nodes; | |
24 | |
25 import static org.junit.Assert.*; | |
26 | |
27 import org.junit.*; | |
28 | |
29 import com.oracle.truffle.api.frame.*; | |
30 import com.oracle.truffle.api.nodes.*; | |
31 | |
32 /** | |
33 * Tests optional method for ensuring that a node replacement is type safe. Ordinary node | |
34 * replacement is performed by unsafe assignment of a parent node's child field. | |
35 */ | |
36 public class SafeReplaceTest { | |
37 | |
38 @Test | |
39 public void testCorrectReplacement() { | |
40 TestRootNode root = new TestRootNode(); | |
41 final TestNode oldChild = new TestNode(); | |
42 root.child = oldChild; | |
43 assertFalse(oldChild.isReplaceable()); // No parent node | |
44 root.adoptChildren(); | |
45 assertTrue(oldChild.isReplaceable()); // Now adopted by parent | |
46 final TestNode newChild = new TestNode(); | |
47 assertTrue(oldChild.isSafelyReplaceableBy(newChild)); // Parent field type is assignable by | |
48 // new node | |
49 oldChild.replace(newChild); | |
50 root.execute(null); | |
51 assertEquals(root.executed, 1); | |
52 assertEquals(oldChild.executed, 0); | |
53 assertEquals(newChild.executed, 1); | |
54 } | |
55 | |
56 @Test | |
57 public void testIncorrectReplacement() { | |
58 TestRootNode root = new TestRootNode(); | |
59 final TestNode oldChild = new TestNode(); | |
60 root.child = oldChild; | |
61 root.adoptChildren(); | |
62 final WrongTestNode newChild = new WrongTestNode(); | |
63 assertFalse(oldChild.isSafelyReplaceableBy(newChild)); | |
64 // Can't test: oldChild.replace(newChild); | |
65 // Fails if assertions checked; else unsafe assignment will eventually crash the VM | |
66 } | |
67 | |
68 private static class TestNode extends Node { | |
69 | |
70 private int executed; | |
71 | |
72 public Object execute() { | |
73 executed++; | |
74 return null; | |
75 } | |
76 } | |
77 | |
78 private static class TestRootNode extends RootNode { | |
79 | |
80 @Child TestNode child; | |
81 | |
82 private int executed; | |
83 | |
84 @Override | |
85 public Object execute(VirtualFrame frame) { | |
86 executed++; | |
87 child.execute(); | |
88 return null; | |
89 } | |
90 } | |
91 | |
92 private static class WrongTestNode extends Node { | |
93 } | |
94 | |
95 } |