evmasm

EVM (Ethereum Virtual Machine) Assembler

Usage no npm install needed!

<script type="module">
  import evmasm from 'https://cdn.skypack.dev/evmasm';
</script>

README

evmasm

EVM (Ethereum Virtual Machine) assembler, WIP

Global installation and usage

Via npm on Node:

npm install -g evmasm

Then run

evmasm file.asm

The output is the compiled bytecode for Ethereum Virtual Machine.

The assembler source code is compatible with the solc --asm output (after commenting some lines starting with ==...)

Asembler source code sample:

// ======= empty.sol:Empty =======

EVM assembly:
    /* "empty.sol":59:78  contract Empty {
... */
  mstore(0x40, 0x60)
  jumpi(tag_1, iszero(callvalue))
  0x0
  dup1
  revert
tag_1:
tag_2:
  dataSize(sub_0)
  dup1
  dataOffset(sub_0)
  0x0
  codecopy
  0x0
  return
stop

sub_0: assembly {
        /* "empty.sol":59:78  contract Empty {
... */
      mstore(0x40, 0x60)
    tag_1:
      0x0
      dup1
      revert

    auxdata: 0xa165627a7a7230582046b5464930e5eb5db6027b5aaae7f9140430cdd322d5eb42de2e546521573bd90029
}

Compiled using solc --asm from contract source code:

// Simple empty contract

contract Empty {
}

Library usage

Install

npm install evmasm

Usage

var evmasm = require('evmasm');

var bytecode = evmasm.compile('mstore(0x40, 0x60)');

console.log(bytecode); // 6060604052

Additional Opcodes

There are new functions to support literal data:

opcode(0xfa) 		// new opcode
data(0x01020304)	// arbitrary data

References

Samples

Versions

  • 0.0.1 Published
  • 0.0.2 Published, opcode and data functions
  • 0.0.3 Published, define custom opcode and data, keccak256 opcode (old sha3)

Contribution

Feel free to file issues and submit pull requests � contributions are welcome.

If you submit a pull request, please be sure to add or update corresponding test cases, and ensure that npm test continues to pass.