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website: details for diffMode of prestateTracer (#27210)

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tracing: add details about diff mode of prestateTracer
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Sina Mahmoodi 2023-05-08 09:19:16 +02:00 committed by GitHub
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docs/developers/evm-tracing/built-in-tracers.md
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@ -204,9 +204,17 @@ The prestate tracer has two modes: `prestate` and `diff`. The `prestate` mode re
| code | string | hex-encoded bytecode |
| storage | map[string]string | storage slots of the contract |
To run this tracer in `diff` mode, pass `tracerConfig: {diffMode: true}` in the APi call.
In `diff` mode the result object will contain a `pre` and a `post` object:
Example:
1. Any read-only access is omitted completely from the result. This mode is only concerned with state modifications.
2. In `pre` you will find the state of an account before the tx started, and in post its state after tx execution finished.
3. `post` will contain only the modified fields. e.g. if `nonce` of an account hasn't changed it will be omitted from `post`.
4. Deletion (i.e. account selfdestruct, or storage clearing) will be signified by inclusion in `pre` and omission in `post`.
5. Insertion (i.e. account creation or new slots) will be signified by omission in `pre` and inclusion in `post`.
To run this tracer in `diff` mode, pass `tracerConfig: {diffMode: true}` in the API call.
Example of `prestate` mode:
```js
debug.traceCall(