1// Copyright 2012 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 --always-opt --expose-gc
29
30// Test that the elements kind of the boilerplate object is sufficiently
31// checked in LFastLiteral, so that unoptimized code can transition the
32// boilerplate. The --always-opt flag makes sure that optimized code is
33// not thrown away at deoptimization.
34
35// The switch statement in f() makes sure that f() is not inlined. If we
36// start inlining switch statements, we will still catch the bug on the
37// final --stress-opt run.
38
39function f(x) {
40  switch(x) {
41    case 1: return 1.4;
42    case 2: return 1.5;
43    case 3: return {};
44    default: gc();
45  }
46}
47
48function g(x) {
49  return [1.1, 1.2, 1.3, f(x)];
50}
51
52// Step 1: Optimize g() to contain a FAST_DOUBLE_ELEMENTS boilerplate.
53assertEquals([1.1, 1.2, 1.3, 1.4], g(1));
54assertEquals([1.1, 1.2, 1.3, 1.5], g(2));
55%OptimizeFunctionOnNextCall(g);
56
57// Step 2: Deoptimize g() and transition to FAST_ELEMENTS boilerplate.
58assertEquals([1.1, 1.2, 1.3, {}], g(3));
59
60// Step 3: Cause a GC while broken clone of boilerplate is on the heap,
61// hence causing heap verification to catch it.
62assertEquals([1.1, 1.2, 1.3, undefined], g(4));
63