1// Copyright 2013 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28// Flags: --allow-natives-syntax
29// Flags: --concurrent-recompilation --block-concurrent-recompilation
30// Flags: --nostress-opt
31
32// --nostress-opt is in place because this particular optimization
33// (guaranteeing that the Array prototype chain has no elements) is
34// maintained isolate-wide. Once it's been "broken" by the change
35// to the Object prototype below, future compiles will not use the
36// optimization anymore, and the code will remain optimized despite
37// additional changes to the prototype chain.
38
39if (!%IsConcurrentRecompilationSupported()) {
40  print("Concurrent recompilation is disabled. Skipping this test.");
41  quit();
42}
43
44function f1(a, i) {
45  return a[i] + 0.5;
46}
47
48var arr = [0.0,,2.5];
49assertEquals(0.5, f1(arr, 0));
50assertEquals(0.5, f1(arr, 0));
51
52// Optimized code of f1 depends on initial object and array maps.
53%OptimizeFunctionOnNextCall(f1, "concurrent");
54// Kick off recompilation;
55assertEquals(0.5, f1(arr, 0));
56// Invalidate current initial object map after compile graph has been created.
57Object.prototype[1] = 1.5;
58assertEquals(2, f1(arr, 1));
59// Not yet optimized since concurrent recompilation is blocked.
60assertUnoptimized(f1, "no sync");
61// Let concurrent recompilation proceed.
62%UnblockConcurrentRecompilation();
63// Sync with background thread to conclude optimization, which bails out
64// due to map dependency.
65assertUnoptimized(f1, "sync");
66//Clear type info for stress runs.
67%ClearFunctionTypeFeedback(f1);
68