research: precompile call evm in the same session

[yihuang]

To achieve true interoperability between native code(precompiles) and EVM, native code should be able to call EVM in the same EVM instance.

Precompiles can call the four variant of evm.Call* method to call evm contracts with the current evm instance, but there are a few issues to beware of:

• Context passing. Precompile should pass the current calling context down the stream.

  • to do that, precompiles needs to receive the correct calling contexts first (Problem: precompile don't carry full EVM context go-ethereum#10).
  • jumpDests cache need to be passed as well.

• Precompile implementations should deal with re-entrant calls.

Anything else? or is there projects that had did this before that we can take as reference?

Use Cases

Any non-trivial precompile contract will need to be able to call back into EVM world back and force, for example a native DEX that works with ERC20 contracts.

[linear]

EVM-384