Explore the series

Building an EVM from scratch part 1 - the execution context

Building an EVM from scratch part 2 - branching instructions

Building an EVM from scratch part 3 - calldata and the function dispatcher

🟩🟩🟩🟩🟩🟩⬜⬜⬜⬜ 85/142 instructions implemented

Github branch: smol-evm/evm-from-scratch-pt3

Introduction

In this part:

• we implement calldata to pass input to our programs (CALLDATASIZE, CALLDATALOAD...)
• we expand our instruction set with more comparison instructions (GT, LT, EQ, ISZERO...)
• we build a script to explore the function dispatcher of unverified contracts!

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Call data

In section 4.2 that defines transactions, the yellow paper specifies that