Hi v8-folks,
I have some doubts regarding inline cache behaviour. If you don't mind I
would like to ask some questions here.
The example is as below:
```
$ cat simple.js
function foo(_prop) {
this.my_prop = _prop;
}
var a = new foo(3); // expects this.my_prop to be premonomorphic
var b = new foo(5); // expects this.my_prop to be monomorphic
var c = new foo(7); // expects to stay in monomorphic
var d = new foo("hello"); // expects this.my_prop to be polymorphic
```
I run the example with trace_ic option.
```
$ ./d8 --trace_ic simple.js | grep my_prop
[StoreIC in ~foo+64 at simple.js:2 (0->.) #my_prop]
[StoreIC in ~foo+64 at simple.js:2 (.->1) #my_prop]
[StoreIC in ~foo+64 at simple.js:2 (^->1) #my_prop]
```
In the above example, how come inline cache of my_prop is changed as below?
1. UNINITIALIZED(0) -> PREMONOMORPHIC(.)
2. PREMONOMORPHIC(.) -> MONOMORPHIC(1)
3. suddenly PROTOTYPE_FAILURE(^) -> MONOMORPHIC(1)
I don't understand the transition from step 2 to step 3. As far as I
understood, it has to be MONOMORPHIC -> POLYMORPHIC.
Is this correct behaviour?
Best regards,
Honggyu
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