Struct Stack

pub struct Stack { /* private fields */ }

EVM stack.

Implementations

impl Stack

pub fn new(limit: usize) -> Self

Create a new stack with given limit.

pub fn limit(&self) -> usize

Stack limit.

pub fn len(&self) -> usize

Stack length.

pub fn is_empty(&self) -> bool

Whether the stack is empty.

pub fn data(&self) -> &Vec<H256>

Stack data.

pub fn pop(&mut self) -> Result<H256, ExitError>

Pop a value from the stack. If the stack is already empty, returns the StackUnderflow error.

pub fn push(&mut self, value: H256) -> Result<(), ExitError>

Push a new value into the stack. If it will exceed the stack limit, returns StackOverflow error and leaves the stack unchanged.

pub fn peek(&self, no_from_top: usize) -> Result<H256, ExitError>

Peek a value at given index for the stack, where the top of the stack is at index 0. If the index is too large, StackError::Underflow is returned.

pub fn set(&mut self, no_from_top: usize, val: H256) -> Result<(), ExitError>

Set a value at given index for the stack, where the top of the stack is at index 0. If the index is too large, StackError::Underflow is returned.

Trait Implementations

impl Clone for Stack

fn clone(&self) -> Stack

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Stack

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.