See
https://groups.google.com/a/chromium.org/forum/?utm_medium=email&utm_source=footer#!msg/chromium-dev/r7cw-pFYmEg/9IngGsKnBgAJ
.
On Thu, May 10, 2018 at 6:19 AM Artem Boldyrev <boldyr...@gmail.com> wrote:
> I'm doing research and using Frida for dynamic binary instrumentation v8
> in Chromium. I'm interested in how the v8::String (or v8::internal::String)
> object is stored in memory. I call setTimeout("console.log ('12339');",
> 100); on the web page and I intercept the setTimeoutMethodCallback call at
> the interpreter level. After that I get access to the String object from
> FunctionCallbackInfo <v8 :: Value> args.
>
> The first call the String object in memory looks like this:
>
>
> <https://lh3.googleusercontent.com/-CdFJoQ1izkE/WvRFwz1X9yI/AAAAAAAAACc/snMn50OjU2Q3KdIhIl4TNOOFEfTnZm-BgCLcBGAs/s1600/first.png>
>
>
>
>
>
>
>
>
> You can see that there is a line through 23 bytes, and before it its
> length.
>
> But already with the repeated call setTimeout ("console.log ('12339');",
> 100); the String object looks like this:
>
>
> <https://lh3.googleusercontent.com/-qxFoeD7D19U/WvRGAgZXedI/AAAAAAAAACk/Wo4_tMv5aG0bnvetTE7TNWAZ1Nj1EYdggCLcBGAs/s1600/second.png>
>
>
>
>
>
>
>
>
> The length of the line is also visible, but the line itself is no longer
> visible. What is it? Is this caching? Is it a feature of v8 or Chromium?
> Why does this happen and what is the structure of the String object now?
> And where is the line now? Please help with research. I did not find the
> documentation for something like this.
>
> --
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