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ERC20-Golf

@the_ethernaut :

EVM golf #9:

Warning: Hardcore level!

Smallest bytecode fully compliant ERC20 implementation.

Deployed contract on Rinkeby: 0xf8B33db61c072264bEBB1333c8064BA43C3a6347

bytecode deployed bytecode
360 bytes 337 bytes

Added more opcode optimization in the expense of gas costs. You can have look at the funky-optimizations branch.

Benchmark for modified funky-optimizations:

bytecode deployed bytecode
273 bytes 187 bytes

Deployed funky optimized contract on Rinkeby: 0x8b38be1ff7c640079acc30833148055086631a1e

Notes

  • event topics are not stored in storage for gas optimization
  • storage is only used for balances and allowances

TODO

  • refactor allowance_slot macro
  • hoist up some of the repeated constants up and use dupN opcodes, might not be good for gas.

Issues

  • etk doesn't allow comment only lines in macros

Ref