Today I will try to finalize the implmentation of the arithmetic opcodes and pass all the related tests.
EDIT: I overdid it a bit, and also implemented: SDIV, MOD, SMOD, LT, GT, SLT, SGT, EQ, ISZERO, AND, OR, XOR, NOT, BYTE, JUMP, JUMPI and JUMPDEST. I managed to do so many of them together because they don't require any new data structures, and they all are pretty basic. Nonetheless I learned a lot trying to debug the differences between DIV and SDIV, which then made the others easier to implement once I understood the modulo-256-bit pattern.
I am noticing that the src/opcodes/runner.ts file is getting a touch crowded. I might refactor the runners into subfolders and just import them into a general runners file.
While reading through the "EVM Illustrated" slides, I came across the debug view functionality available in geth. It's a great way to visualize all the state changes that occur during an execution, so I want to implement something similar in my EVM in the future.
I also found and fixed a bug in the stack popN method, in which I returned the items in the wrong order.
- Ethereum Specification: A collection of documents that describe the Ethereum protocol, maintained by the Ethereum Foundation. Great insights about specific opcodes implementation in there as well.
- EVM Rust crate: A Rust crate that implements the EVM. Will be useful in the future maybe!