v8/test/mjsunit/compiler/optimized-for-in.js

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// Copyright 2012 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: --optimize-for-in --allow-natives-syntax
// Test for-in support in Crankshaft. For simplicity this tests assumes certain
// fixed iteration order for properties and will have to be adjusted if V8
// stops following insertion order.
function a(t) {
var result = [];
for (var i in t) {
result.push(i + t[i]);
}
return result.join('');
}
// Check that we correctly deoptimize on map check.
function b(t) {
var result = [];
for (var i in t) {
result.push(i + t[i]);
delete t[i];
}
return result.join('');
}
// Check that we correctly deoptimize during preparation step.
function c(t) {
var result = [];
for (var i in t) {
result.push(i + t[i]);
}
return result.join('');
}
// Check that we deoptimize to the place after side effect in the right state.
function d(t) {
var result = [];
var o;
for (var i in (o = t())) {
result.push(i + o[i]);
}
return result.join('');
}
// Check that we correctly deoptimize on map check inserted for fused load.
function e(t) {
var result = [];
for (var i in t) {
delete t[i];
t[i] = i;
result.push(i + t[i]);
}
return result.join('');
}
// Nested for-in loops.
function f(t) {
var result = [];
for (var i in t) {
for (var j in t) {
result.push(i + j + t[i] + t[j]);
}
}
return result.join('');
}
// Deoptimization from the inner for-in loop.
function g(t) {
var result = [];
for (var i in t) {
for (var j in t) {
result.push(i + j + t[i] + t[j]);
var v = t[i];
delete t[i];
t[i] = v;
}
}
return result.join('');
}
// Break from the inner for-in loop.
function h(t, deopt) {
var result = [];
for (var i in t) {
for (var j in t) {
result.push(i + j + t[i] + t[j]);
break;
}
}
deopt.deopt;
return result.join('');
}
// Continue in the inner loop.
function j(t, deopt) {
var result = [];
for (var i in t) {
for (var j in t) {
result.push(i + j + t[i] + t[j]);
continue;
}
}
deopt.deopt;
return result.join('');
}
// Continue of the outer loop.
function k(t, deopt) {
var result = [];
outer: for (var i in t) {
for (var j in t) {
result.push(i + j + t[i] + t[j]);
continue outer;
}
}
deopt.deopt;
return result.join('');
}
// Break of the outer loop.
function l(t, deopt) {
var result = [];
outer: for (var i in t) {
for (var j in t) {
result.push(i + j + t[i] + t[j]);
break outer;
}
}
deopt.deopt;
return result.join('');
}
// Test deoptimization from inlined frame (currently it is not inlined).
function m0(t, deopt) {
for (var i in t) {
for (var j in t) {
deopt.deopt;
return i + j + t[i] + t[j];
}
}
}
function m(t, deopt) {
return m0(t, deopt);
}
function tryFunction(s, mkT, f) {
var d = {deopt: false};
assertEquals(s, f(mkT(), d));
assertEquals(s, f(mkT(), d));
assertEquals(s, f(mkT(), d));
%OptimizeFunctionOnNextCall(f);
assertEquals(s, f(mkT(), d));
assertEquals(s, f(mkT(), {}));
}
var s = "a1b2c3d4";
function mkTable() { return { a: "1", b: "2", c: "3", d: "4" }; }
tryFunction(s, mkTable, a);
tryFunction(s, mkTable, b);
tryFunction("0a1b2c3d", function () { return "abcd"; }, c);
tryFunction("0a1b2c3d", function () {
var cnt = false;
return function () {
cnt = true;
return "abcd";
}
}, d);
tryFunction("aabbccdd", mkTable, e);
function mkSmallTable() { return { a: "1", b: "2" }; }
tryFunction("aa11ab12ba21bb22", mkSmallTable, f);
tryFunction("aa11ab12bb22ba21", mkSmallTable, g);
tryFunction("aa11ba21", mkSmallTable, h);
tryFunction("aa11ab12ba21bb22", mkSmallTable, j);
tryFunction("aa11ba21", mkSmallTable, h);
tryFunction("aa11ba21", mkSmallTable, k);
tryFunction("aa11", mkSmallTable, l);
tryFunction("aa11", mkSmallTable, m);
// Test handling of null.
tryFunction("", function () {
return function () { return null; }
}, function (t) {
for (var i in t()) { return i; }
return "";
});
// Test smis.
tryFunction("", function () {
return function () { return 11; }
}, function (t) {
for (var i in t()) { return i; }
return "";
});
// Test LoadFieldByIndex for out of object properties.
function O() { this.a = 1; }
for (var i = 0; i < 10; i++) new O();
tryFunction("a1b2c3d4e5f6", function () {
var o = new O();
o.b = 2;
o.c = 3;
o.d = 4;
o.e = 5;
o.f = 6;
return o;
}, function (t) {
var r = [];
for (var i in t) r.push(i + t[i]);
return r.join('');
});
// Test OSR inside for-in.
function osr_inner(t, limit) {
var r = 1;
for (var x in t) {
if (t.hasOwnProperty(x)) {
for (var i = 0; i < t[x].length; i++) {
r += t[x][i];
if (i === limit) {
%OptimizeFunctionOnNextCall(osr_inner, "osr");
}
}
r += x;
}
}
return r;
}
function osr_outer(t, osr_after) {
var r = 1;
for (var x in t) {
for (var i = 0; i < t[x].length; i++) {
r += t[x][i];
}
if (x === osr_after) {
%OptimizeFunctionOnNextCall(osr_outer, "osr");
}
r += x;
}
return r;
}
function osr_outer_and_deopt(t, osr_after) {
var r = 1;
for (var x in t) {
r += x;
if (x == osr_after) {
%OptimizeFunctionOnNextCall(osr_outer_and_deopt, "osr");
}
}
return r;
}
function test_osr() {
with ({}) {} // Disable optimizations of this function.
var arr = new Array(20);
for (var i = 0; i < arr.length; i++) {
arr[i] = i + 1;
}
arr.push(":"); // Force deopt at the end of the loop.
assertEquals("211:x1234567891011121314151617181920:y", osr_inner({x: arr, y: arr}, (arr.length / 2) | 0));
assertEquals("7x456y", osr_outer({x: [1,2,3], y: [4,5,6]}, "x"));
assertEquals("101234567", osr_outer_and_deopt([1,2,3,4,5,6,7,8], "5"));
}
test_osr();