v8/test/mjsunit/array-literal-feedback.js

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// 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 --smi-only-arrays --expose-gc
// Flags: --track-allocation-sites --noalways-opt
// Test element kind of objects.
// Since --smi-only-arrays affects builtins, its default setting at compile
// time sticks if built with snapshot. If --smi-only-arrays is deactivated
// by default, only a no-snapshot build actually has smi-only arrays enabled
// in this test case. Depending on whether smi-only arrays are actually
// enabled, this test takes the appropriate code path to check smi-only arrays.
// support_smi_only_arrays = %HasFastSmiElements(new Array(1,2,3,4,5,6,7,8));
support_smi_only_arrays = true;
if (support_smi_only_arrays) {
print("Tests include smi-only arrays.");
} else {
print("Tests do NOT include smi-only arrays.");
}
if (support_smi_only_arrays) {
function get_literal(x) {
var literal = [1, 2, x];
return literal;
}
get_literal(3);
get_literal(3);
%OptimizeFunctionOnNextCall(get_literal);
a = get_literal(3);
assertOptimized(get_literal);
assertTrue(%HasFastSmiElements(a));
a[0] = 3.5;
// We should have transitioned the boilerplate array to double, and
// crankshafted code should de-opt on the unexpected elements kind
b = get_literal(3);
assertTrue(%HasFastDoubleElements(b));
assertEquals([1, 2, 3], b);
assertUnoptimized(get_literal);
// Optimize again
get_literal(3);
%OptimizeFunctionOnNextCall(get_literal);
b = get_literal(3);
assertTrue(%HasFastDoubleElements(b));
assertOptimized(get_literal);
}