xref: /external/v8/test/mjsunit/concurrent-initial-prototype-change.js

// Copyright 2013 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Flags: --allow-natives-syntax
// Flags: --concurrent-recompilation --block-concurrent-recompilation
// Flags: --nostress-opt

// --nostress-opt is in place because this particular optimization
// (guaranteeing that the Array prototype chain has no elements) is
// maintained isolate-wide. Once it's been "broken" by the change
// to the Object prototype below, future compiles will not use the
// optimization anymore, and the code will remain optimized despite
// additional changes to the prototype chain.

if (!%IsConcurrentRecompilationSupported()) {
  print("Concurrent recompilation is disabled. Skipping this test.");
  quit();
}

function f1(a, i) {
  return a[i] + 0.5;
}

var arr = [0.0,,2.5];
assertEquals(0.5, f1(arr, 0));
assertEquals(0.5, f1(arr, 0));

// Optimized code of f1 depends on initial object and array maps.
%OptimizeFunctionOnNextCall(f1, "concurrent");
// Kick off recompilation;
assertEquals(0.5, f1(arr, 0));
// Invalidate current initial object map after compile graph has been created.
Object.prototype[1] = 1.5;
assertEquals(2, f1(arr, 1));
// Not yet optimized since concurrent recompilation is blocked.
assertUnoptimized(f1, "no sync");
// Let concurrent recompilation proceed.
%UnblockConcurrentRecompilation();
// Sync with background thread to conclude optimization, which bails out
// due to map dependency.
assertUnoptimized(f1, "sync");
//Clear type info for stress runs.
%ClearFunctionTypeFeedback(f1);