A (slightly) stripped down version of the EVM implemented on top of the EVM using yul and solidity.
idk, for fun. Its a fun memory-management challenge. Also I've always wanted scripting in solidity and this is a step in that direction.
A dynamic in-memory array is used as a jump table for ops. A dynamic in-memory array is used for the simulated EVM's stack variables. The simulated EVM's memory is held at a moveable offset and can move if needed (unlikely unless stack is forced to move).
Currently no context switching opcodes (all flavors of call). We can simulate a lot of these in memory if want though, just haven't gotten around to it.
Also bugs. Probably many bugs.
And gas. There are large one-time gas costs, that get amortized with more ops (but not a ton).
contract EvmTest is DSTest {
function testMul() public {
Evm evm;
// pass in raw bytecode and it evaluates it
// does 1 * 3 and returns it
(bool succ, bytes memory ret) = evm.evaluate(hex"600160030260205260206000F3");
(uint256 r) = abi.decode(ret, (uint256));
assertTrue(succ);
assertEq(r, 3);
}
}
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