src/third_party/mozjs-45/js/src/jit-test/tests/ion/recover-objects.js

// |jit-test| test-join=--no-unboxed-objects; --ion-pgo=on
//
// Unboxed object optimization might not trigger in all cases, thus we ensure
// that Scalar Replacement optimization is working well independently of the
// object representation.

// Ion eager fails the test below because we have not yet created any
// template object in baseline before running the content of the top-level
// function.
if (getJitCompilerOptions()["ion.warmup.trigger"] <= 90)
    setJitCompilerOption("ion.warmup.trigger", 90);

// This test checks that we are able to remove the getprop & setprop with scalar
// replacement, so we should not force inline caches, as this would skip the
// generation of getprop & setprop instructions.
if (getJitCompilerOptions()["ion.forceinlineCaches"])
    setJitCompilerOption("ion.forceinlineCaches", 0);

function resumeHere() {}
var uceFault = function (i) {
    if (i > 98)
        uceFault = function (i) { return true; };
    return false;
};


// Without "use script" in the inner function, the arguments might be
// observable.
function inline_notSoEmpty1(a, b, c, d) {
    // This function is not strict, so we might be able to observe its
    // arguments, if somebody ever called fun.arguments inside it.
    return { v: (a.v + b.v + c.v + d.v - 10) / 4 };
}
var uceFault_notSoEmpty1 = eval(uneval(uceFault).replace('uceFault', 'uceFault_notSoEmpty1'));
function notSoEmpty1() {
    var a = { v: i };
    var b = { v: 1 + a.v };
    var c = { v: 2 + b.v };
    var d = { v: 3 + c.v };
    var unused = { v: 4 + d.v };
    var res = inline_notSoEmpty1(a, b, c, d);
    if (uceFault_notSoEmpty1(i) || uceFault_notSoEmpty1(i))
        assertEq(i, res.v);
    // Note, that even if the arguments are observable, we are capable of
    // optimizing these cases by executing recover instruction before the
    // execution of the bailout. This ensures that the observed objects are
    // allocated once and used by the unexpected observation and the bailout.
    assertRecoveredOnBailout(a, true);
    assertRecoveredOnBailout(b, true);
    assertRecoveredOnBailout(c, true);
    assertRecoveredOnBailout(d, true);
    assertRecoveredOnBailout(unused, true);
    // This can only be recovered on bailout iff either we have type
    // information for the property access in the branch, or the branch is
    // removed before scalar replacement.
    assertRecoveredOnBailout(res, true);
}

// Check that we can recover objects with their content.
function inline_notSoEmpty2(a, b, c, d) {
    "use strict";
    return { v: (a.v + b.v + c.v + d.v - 10) / 4 };
}
var uceFault_notSoEmpty2 = eval(uneval(uceFault).replace('uceFault', 'uceFault_notSoEmpty2'));
function notSoEmpty2(i) {
    var a = { v: i };
    var b = { v: 1 + a.v };
    var c = { v: 2 + b.v };
    var d = { v: 3 + c.v };
    var unused = { v: 4 + d.v };
    var res = inline_notSoEmpty2(a, b, c, d);
    if (uceFault_notSoEmpty2(i) || uceFault_notSoEmpty2(i))
        assertEq(i, res.v);
    assertRecoveredOnBailout(a, true);
    assertRecoveredOnBailout(b, true);
    assertRecoveredOnBailout(c, true);
    assertRecoveredOnBailout(d, true);
    assertRecoveredOnBailout(unused, true);
    // This can only be recovered on bailout iff either we have type
    // information for the property access in the branch, or the branch is
    // removed before scalar replacement.
    assertRecoveredOnBailout(res, true);
}

// Check that we can recover objects with their content.
var argFault_observeArg = function (i) {
    if (i > 98)
        return inline_observeArg.arguments[0];
    return { test : i };
};
function inline_observeArg(obj, i) {
    return argFault_observeArg(i);
}
function observeArg(i) {
    var obj = { test: i };
    var res = inline_observeArg(obj, i);
    assertEq(res.test, i);
    assertRecoveredOnBailout(obj, true);
}

// Check case where one successor can have multiple times the same predecessor.
function complexPhi(i) {
    var obj = { test: i };
    switch (i) { // TableSwitch
        case 0: obj.test = 0; break;
        case 1: obj.test = 1; break;
        case 2: obj.test = 2; break;
        case 3: case 4: case 5: case 6:
        default: obj.test = i; break;
        case 7: obj.test = 7; break;
        case 8: obj.test = 8; break;
        case 9: obj.test = 9; break;
    }
    assertEq(obj.test, i);
    assertRecoveredOnBailout(obj, true);
}

// Check case where one successor can have multiple times the same predecessor.
function withinIf(i) {
    var x = undefined;
    if (i % 2 == 0) {
        let obj = { foo: i };
        x = obj.foo;
        assertRecoveredOnBailout(obj, true);
        obj = undefined;
    } else {
        let obj = { bar: i };
        x = obj.bar;
        assertRecoveredOnBailout(obj, true);
        obj = undefined;
    }
    assertEq(x, i);
}

// Check case where one successor can have multiple times the same predecessor.
function unknownLoad(i) {
    var obj = { foo: i };
    assertEq(obj.bar, undefined);
    // Unknown properties are using GetPropertyCache.
    assertRecoveredOnBailout(obj, false);
}

// Check with dynamic slots.
function dynamicSlots(i) {
    var obj = {
        p0: i + 0, p1: i + 1, p2: i + 2, p3: i + 3, p4: i + 4, p5: i + 5, p6: i + 6, p7: i + 7, p8: i + 8, p9: i + 9, p10: i + 10,
        p11: i + 11, p12: i + 12, p13: i + 13, p14: i + 14, p15: i + 15, p16: i + 16, p17: i + 17, p18: i + 18, p19: i + 19, p20: i + 20,
        p21: i + 21, p22: i + 22, p23: i + 23, p24: i + 24, p25: i + 25, p26: i + 26, p27: i + 27, p28: i + 28, p29: i + 29, p30: i + 30,
        p31: i + 31, p32: i + 32, p33: i + 33, p34: i + 34, p35: i + 35, p36: i + 36, p37: i + 37, p38: i + 38, p39: i + 39, p40: i + 40,
        p41: i + 41, p42: i + 42, p43: i + 43, p44: i + 44, p45: i + 45, p46: i + 46, p47: i + 47, p48: i + 48, p49: i + 49, p50: i + 50
    };
    // Add a function call to capture a resumepoint at the end of the call or
    // inside the inlined block, such as the bailout does not rewind to the
    // beginning of the function.
    resumeHere(); bailout();
    assertEq(obj.p0 + obj.p10 + obj.p20 + obj.p30 + obj.p40, 5 * i + 100);
    assertRecoveredOnBailout(obj, true);
}

// Check that we can correctly recover allocations of new objects.
function Point(x, y)
{
    this.x = x;
    this.y = y;
}

function createThisWithTemplate(i)
{
    var p = new Point(i - 1, i + 1);
    bailout();
    assertEq(p.y - p.x, 2);
    assertRecoveredOnBailout(p, true);
}

for (var i = 0; i < 100; i++) {
    notSoEmpty1(i);
    notSoEmpty2(i);
    observeArg(i);
    complexPhi(i);
    withinIf(i);
    unknownLoad(i);
    dynamicSlots(i);
    createThisWithTemplate(i);
}