v8/test/mjsunit/smi-representation.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: --track-fields --track-double-fields --allow-natives-syntax
function smi_field() {
return {"smi":0};
}
function check_smi_repr(o, d1, d2) {
var s = o.smi;
var d = d1 - d2;
s = s + d;
o.smi = s;
return o;
}
var test = smi_field();
check_smi_repr(smi_field(), 5, 3);
check_smi_repr(smi_field(), 6, 2);
%OptimizeFunctionOnNextCall(check_smi_repr);
var val = check_smi_repr(smi_field(), 8, 1);
assertTrue(%HaveSameMap(val, test));
function tagged_smi_field() {
var o = {"tag":false};
o.tag = 10;
return o;
}
function check_smi_repr_from_tagged(o, o2) {
var t = o2.tag;
o.smi = t;
return o;
}
check_smi_repr_from_tagged(smi_field(), tagged_smi_field());
check_smi_repr_from_tagged(smi_field(), tagged_smi_field());
%OptimizeFunctionOnNextCall(check_smi_repr_from_tagged);
var val = check_smi_repr_from_tagged(smi_field(), tagged_smi_field());
assertTrue(%HaveSameMap(val, test));
var overflow = tagged_smi_field();
overflow.tag = 0x80000000;
var val = check_smi_repr_from_tagged(smi_field(), overflow);