question about V8 Stack roots

[theratliter theratliter]

Hi all ! does anyone know what the "Stack root" means ? the memory hold by stack variable ？

[Ben Noordhuis]

On Tue, Apr 4, 2023 at 1:41 PM theratliter theratliter
<thera...@gmail.com> wrote:
>
> Hi all ! does anyone know what the "Stack root" means ? the memory hold by stack variable ？

They're live references to GC objects in JS and WASM stack frames. A
JS function's local variables are an example.

[theratliter theratliter]

Thanks, how can get this result ? my test code is as follows.

const { writeHeapSnapshot } = require('v8');

function run() {

const arr = [];

for (let i = 0; i < 10000000; i++) {

arr[i] = i;

}

writeHeapSnapshot('1.heapsnapshot');

// Prevent from GC

JSON.stringify(arr);

}

run();

and the result is as follows.

[Ben Noordhuis]

Can you explain what exactly you find surprising?

[theratliter theratliter]

I thought i can see "stack roots" in heapsnapshot

Ben Noordhuis <in...@bnoordhuis.nl>于2023年4月5日 周三16:39写道：

Can you explain what exactly you find surprising?

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[theratliter theratliter]

I find "stack roots" in heapsnapshot in Node.js v16.18.1, i think it is related to V8 Version. Thanks .