// 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: --allow-natives-syntax --smi-only-arrays
// Flags: --nostress-opt
// Ensure that ElementsKind transitions in various situations are hoisted (or
// not hoisted) correctly, don't change the semantics programs and don't trigger
// deopt through hoisting in important situations.
support_smi_only_arrays = %HasFastSmiElements(new Array(1,2,3,4,5,6));
if (support_smi_only_arrays) {
print("Tests include smi-only arrays.");
} else {
print("Tests do NOT include smi-only arrays.");
}
function test_wrapper() {
// Make sure that a simple elements array transitions inside a loop before
// stores to an array gets hoisted in a way that doesn't generate a deopt in
// simple cases.}
function testDoubleConversion4(a) {
var object = new Object();
a[0] = 0;
var count = 3;
do {
a[0] = object;
} while (--count > 0);
}
testDoubleConversion4(new Array(5));
testDoubleConversion4(new Array(5)); // Call twice to make sure that second
// store is a transition and not
// optimistically MONOMORPHIC
%OptimizeFunctionOnNextCall(testDoubleConversion4);
testDoubleConversion4(new Array(5));
testDoubleConversion4(new Array(5));
assertOptimized(testDoubleConversion4);
%ClearFunctionTypeFeedback(testDoubleConversion4);
// Make sure that non-element related map checks that are not preceded by
// transitions in a loop still get hoisted in a way that doesn't generate a
// deopt in simple cases.
function testExactMapHoisting(a) {
var object = new Object();
a.foo = {};
a[0] = 0;
a[1] = 1;
var count = 3;
do {
a.foo = object; // This map check should be hoistable
a[1] = object;
result = a.foo == object && a[1] == object;
} while (--count > 0);
}
testExactMapHoisting(new Array(5));
testExactMapHoisting(new Array(5)); // Call twice to make sure that second
// store is a transition and not
// optimistically MONOMORPHIC
%OptimizeFunctionOnNextCall(testExactMapHoisting);
testExactMapHoisting(new Array(5));
testExactMapHoisting(new Array(5));
assertOptimized(testExactMapHoisting);
%ClearFunctionTypeFeedback(testExactMapHoisting);
// Make sure that non-element related map checks do NOT get hoisted if they
// depend on an elements transition before them and it's not possible to hoist
// that transition.
function testExactMapHoisting2(a) {
var object = new Object();
a.foo = 0;
a[0] = 0;
a[1] = 1;
var count = 3;
do {
if (a.bar === undefined) {
a[1] = 2.5;
}
a.foo = object; // This map check should NOT be hoistable because it
// includes a check for the FAST_ELEMENTS map as well as
// the FAST_DOUBLE_ELEMENTS map, which depends on the
// double transition above in the if, which cannot be
// hoisted.
} while (--count > 0);
}
testExactMapHoisting2(new Array(5));
testExactMapHoisting2(new Array(5)); // Call twice to make sure that second
// store is a transition and not
// optimistically MONOMORPHIC
%OptimizeFunctionOnNextCall(testExactMapHoisting2);
testExactMapHoisting2(new Array(5));
testExactMapHoisting2(new Array(5));
// Temporarily disabled - see bug 2176.
// assertOptimized(testExactMapHoisting2);
%ClearFunctionTypeFeedback(testExactMapHoisting2);
// Make sure that non-element related map checks do get hoisted if they use
// the transitioned map for the check and all transitions that they depend
// upon can hoisted, too.
function testExactMapHoisting3(a) {
var object = new Object();
a.foo = null;
a[0] = 0;
a[1] = 1;
var count = 3;
do {
a[1] = 2.5;
a.foo = object; // This map check should be hoistable because all elements
// transitions in the loop can also be hoisted.
} while (--count > 0);
}
var add_transition = new Array(5);
add_transition.foo = 0;
add_transition[0] = new Object(); // For FAST_ELEMENT transition to be created
testExactMapHoisting3(new Array(5));
testExactMapHoisting3(new Array(5)); // Call twice to make sure that second
// store is a transition and not
// optimistically MONOMORPHIC
%OptimizeFunctionOnNextCall(testExactMapHoisting3);
testExactMapHoisting3(new Array(5));
testExactMapHoisting3(new Array(5));
assertOptimized(testExactMapHoisting3);
%ClearFunctionTypeFeedback(testExactMapHoisting3);
function testDominatingTransitionHoisting1(a) {
var object = new Object();
a[0] = 0;
var count = 3;
do {
if (a.baz != true) {
a[1] = 2.5;
}
a[0] = object;
} while (--count > 3);
}
/*
testDominatingTransitionHoisting1(new Array(5));
testDominatingTransitionHoisting1(new Array(5)); // Call twice to make sure
// that second store is a
// transition and not
// optimistically MONOMORPHIC
%OptimizeFunctionOnNextCall(testDominatingTransitionHoisting1);
testDominatingTransitionHoisting1(new Array(5));
testDominatingTransitionHoisting1(new Array(5));
// TODO(verwaest) With current changes the elements transition gets hoisted
// above the access, causing a deopt. We should update the type of access
// rather than forbid hoisting the transition.
assertOptimized(testDominatingTransitionHoisting1);
%ClearFunctionTypeFeedback(testDominatingTransitionHoisting1);
*/
function testHoistingWithSideEffect(a) {
var object = new Object();
a[0] = 0;
var count = 3;
do {
assertTrue(true);
a[0] = object;
} while (--count > 3);
}
testHoistingWithSideEffect(new Array(5));
testHoistingWithSideEffect(new Array(5)); // Call twice to make sure that
// second store is a transition and
// not optimistically MONOMORPHIC
%OptimizeFunctionOnNextCall(testHoistingWithSideEffect);
testHoistingWithSideEffect(new Array(5));
testHoistingWithSideEffect(new Array(5));
assertOptimized(testHoistingWithSideEffect);
%ClearFunctionTypeFeedback(testHoistingWithSideEffect);
function testStraightLineDupeElinination(a,b,c,d,e,f) {
var count = 3;
do {
assertTrue(true);
a[0] = b;
a[1] = c;
a[2] = d;
assertTrue(true);
a[3] = e; // TransitionElementsKind should be eliminated despite call.
a[4] = f;
} while (--count > 3);
}
testStraightLineDupeElinination(new Array(0, 0, 0, 0, 0),0,0,0,0,.5);
testStraightLineDupeElinination(new Array(0, 0, 0, 0, 0),0,0,0,.5,0);
testStraightLineDupeElinination(new Array(0, 0, 0, 0, 0),0,0,.5,0,0);
testStraightLineDupeElinination(new Array(0, 0, 0, 0, 0),0,.5,0,0,0);
testStraightLineDupeElinination(new Array(0, 0, 0, 0, 0),.5,0,0,0,0);
testStraightLineDupeElinination(new Array(.1,.1,.1,.1,.1),0,0,0,0,.5);
testStraightLineDupeElinination(new Array(.1,.1,.1,.1,.1),0,0,0,.5,0);
testStraightLineDupeElinination(new Array(.1,.1,.1,.1,.1),0,0,.5,0,0);
testStraightLineDupeElinination(new Array(.1,.1,.1,.1,.1),0,.5,0,0,0);
testStraightLineDupeElinination(new Array(.1,.1,.1,.1,.1),.5,0,0,0,0);
testStraightLineDupeElinination(new Array(5),.5,0,0,0,0);
testStraightLineDupeElinination(new Array(5),0,.5,0,0,0);
testStraightLineDupeElinination(new Array(5),0,0,.5,0,0);
testStraightLineDupeElinination(new Array(5),0,0,0,.5,0);
testStraightLineDupeElinination(new Array(5),0,0,0,0,.5);
testStraightLineDupeElinination(new Array(5),.5,0,0,0,0);
testStraightLineDupeElinination(new Array(5),0,.5,0,0,0);
testStraightLineDupeElinination(new Array(5),0,0,.5,0,0);
testStraightLineDupeElinination(new Array(5),0,0,0,.5,0);
testStraightLineDupeElinination(new Array(5),0,0,0,0,.5);
%OptimizeFunctionOnNextCall(testStraightLineDupeElinination);
testStraightLineDupeElinination(new Array(5),0,0,0,0,0);
testStraightLineDupeElinination(new Array(5),0,0,0,0,0);
assertOptimized(testStraightLineDupeElinination);
%ClearFunctionTypeFeedback(testStraightLineDupeElinination);
}
if (support_smi_only_arrays) {
// The test is called in a test wrapper that has type feedback cleared to
// prevent the influence of allocation-sites, which learn from transitions.
test_wrapper();
%ClearFunctionTypeFeedback(test_wrapper);
}