Revisit human-readable presentation of EVM opcodes

During the discussion of pull request #1544, we discussed that the representation of the opcode list in memory may be improved (#1600), and the code displaying opcodes may need refinement #1544 (review)

I prefer a solution like this. It has disadvantages:

Requires new dependencies:
- num-derive — we haven’t used this before.
- num-traits — we already use this directly.
- strum — is used in our subdependencies.
Will increase build time.

#!/usr/bin/env rust-script
//! ```cargo
//! [dependencies]
//! num-derive = "0.4.2"
//! num-traits = "0.2.19"
//! strum = { version = "0.27.2", features = ["derive"] }
//! ```

use num_derive::FromPrimitive;
use num_traits::FromPrimitive;
use strum::IntoStaticStr;

#[derive(FromPrimitive, IntoStaticStr)]
#[repr(u8)]
enum Opcode {
    Stop = 0,
    Add = 1,
    Mul = 2,
}

fn main() {
    let s: &str = Opcode::from_u8(2).unwrap().into();
    assert_eq!(s, "Mul");
    println!("{}", s);
}

A part of #1560
As a follow up of #1544 (review)

Keep in mind we have to interop with evm::Opcode which we don't own

Via recent TWiR: https://sailor.li/ints-to-enums

TLDR

There're also:

derive_more::TryFrom — has a more idiomatic interface, is available in derive_more since 1.0.0.
int_enum — impls TryFrom<repr> as well.

In beta there's std::mem::variant_count.

We would also need to support "other" opcodes - the ones we don't have the names for. Also, from my experience, strum is the to-go solution (other ones are worse one way or another).

@quasiyoke

Probably, reusing evm::Opcode and applying #1642 should cover our goal ?

@quasiyoke

I underestimated how important future-proof support for “invalid” opcodes might be to us. For this reason, evm::Opcode is simply a wrapper around a u8, allowing for opcodes that are not yet known; so using an enum here would not be straightforward.

Navigation Menu

Repository navigation

Revisit human-readable presentation of EVM opcodes #1602

TLDR

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Revisit human-readable presentation of EVM opcodes #1602

Description

Activity

MOZGIII commented on Aug 27, 2025

quasiyoke commented on Aug 28, 2025

TLDR

MOZGIII commented on Aug 28, 2025

dmitrylavrenov commented on Nov 3, 2025

quasiyoke commented on Nov 4, 2025

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions