Working (Easy to Comprehend) EVM

This is a basic easy to understand EVM implementation in rust - it handles most of the essential opcodes. It's suitable for learning EVM internals and running simple bytecode programs.

Completed Features

Core EVM Functionality

• Stack Operations: Proper 256-bit stack with Result-based error handling
• Memory Operations: MLOAD, MSTORE, MSIZE with automatic expansion
• Storage Operations: SLOAD, SSTORE with warm/cold access tracking

Implemented Opcodes

Arithmetic & Comparison

• ADD (0x01) - Addition
• MUL (0x02) - Multiplication
• SUB (0x03) - Subtraction
• DIV (0x04) - Division
• SDIV (0x05) - Signed division
• LT (0x10) - Less than
• GT (0x11) - Greater than
• EQ (0x14) - Equality

Bitwise Operations

• AND (0x16) - Bitwise AND
• OR (0x17) - Bitwise OR
• XOR (0x18) - Bitwise XOR

Stack Operations

• POP (0x50) - Pop from stack
• PUSH1-PUSH32 (0x60-0x7f) - Push values onto stack

Memory Operations

• MLOAD (0x51) - Load 32 bytes from memory
• MSTORE (0x52) - Store 32 bytes to memory
• MSIZE (0x59) - Get memory size

Storage Operations

• SLOAD (0x54) - Load from storage
• SSTORE (0x55) - Store to storage

Control Flow

• JUMP (0x56) - Unconditional jump
• JUMPI (0x57) - Conditional jump
• JUMPDEST (0x5b) - Jump destination marker

Call Data Operations

• CALLDATALOAD (0x35) - Load call data
• CALLDATASIZE (0x36) - Get call data size
• CALLDATACOPY (0x37) - Copy call data to memory

System Operations

• RETURN (0xf3) - Return data
• REVERT (0xfd) - Revert execution
• STOP (0x00) - Stop execution
• SELFDESTRUCT (0xff) - Self destruct
• CALL (0xf1) - Call contract (stub)
• LOG0-LOG4 (0xa0-0xa4) - Log operations (simplified)

Usage

use mini_evm::evm::EVM;
use ethnum::U256;

let program = vec![
    0x60, 0x0a,  // PUSH1 10
    0x60, 0x14,  // PUSH1 20
    0x01,        // ADD
    0x00,        // STOP
];

let mut evm = EVM::new(program, 1000000, 0, vec![]);
match evm.run() {
    Ok(()) => println!("Execution successful"),
    Err(e) => println!("Error: {}", e),
}