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use std::fmt;
use crate::{addressing_modes::Arguments, vm::VirtualMachine};
/// Single EraVM instruction (an opcode + [`Arguments`]).
///
/// Managing instructions is warranted for low-level tests; prefer using [`Program`](crate::Program)s to decode instructions
/// from EraVM bytecodes.
pub struct Instruction<T, W> {
pub(crate) handler: Handler<T, W>,
pub(crate) arguments: Arguments,
}
impl<T, W> fmt::Debug for Instruction<T, W> {
fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
formatter
.debug_struct("Instruction")
.field("arguments", &self.arguments)
.finish_non_exhaustive()
}
}
pub(crate) type Handler<T, W> = fn(&mut VirtualMachine<T, W>, &mut W, &mut T) -> ExecutionStatus;
#[derive(Debug)]
pub(crate) enum ExecutionStatus {
Running,
Stopped(ExecutionEnd),
}
/// VM stop reason returned from [`VirtualMachine::run()`].
#[derive(Debug, PartialEq)]
pub enum ExecutionEnd {
/// The executed program has finished and returned the specified data.
ProgramFinished(Vec<u8>),
/// The executed program has reverted returning the specified data.
Reverted(Vec<u8>),
/// The executed program has panicked.
Panicked,
/// Returned when the bootloader writes to the heap location specified by [`hook_address`](crate::Settings.hook_address).
SuspendedOnHook(u32),
}