Struct ethereumvm::PCMut

pub struct PCMut<'a, P: Patch> { /* fields omitted */ }

Represents a mutable program counter in EVM.

Methods

impl<'a, P: Patch> PCMut<'a, P>

pub fn code(&self) -> &[u8]

Get the code bytearray.

pub fn position(&self) -> usize

Get the current program counter position.

pub fn opcode_position(&self) -> usize

Get the current opcode position. Should only be used when debugging.

pub fn is_valid(&self, position: usize) -> bool

Returns true if the position is a valid jump destination. If not, returns false.

pub fn is_end(&self) -> bool

Check whether the PC is ended. Next read on this PC would result in PCError::PCOverflow.

pub fn peek_opcode(&self) -> Result<Opcode, OnChainError>

Peek the next opcode.

pub fn peek(&self) -> Result<Instruction, OnChainError>

Peek the next instruction.

impl<'a, P: Patch> PCMut<'a, P>

pub fn new(
    patch: &'a P,
    code: &'a [u8],
    valids: &'a Valids,
    position: &'a mut usize
) -> Self

Create a new program counter from the given code.

pub fn jump(&mut self, position: usize) -> Result<(), OnChainError>

Jump to a position in the code. The destination must be valid to jump.

pub fn read(&mut self) -> Result<Instruction, OnChainError>

Read the next instruction and step the program counter.