ckb-script 0.119.0

CKB component to run the type/lock scripts.
Documentation 
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use crate::syscalls::CURRENT_CYCLES;
use ckb_vm::{
    registers::{A0, A7},
    Error as VMError, Register, SupportMachine, Syscalls,
};
use std::sync::{Arc, Mutex};

#[derive(Debug, Default)]
pub struct CurrentCycles {
    base: Arc<Mutex<u64>>,
}

impl CurrentCycles {
    pub fn new(base: Arc<Mutex<u64>>) -> Self {
        Self { base }
    }
}

impl<Mac: SupportMachine> Syscalls<Mac> for CurrentCycles {
    fn initialize(&mut self, _machine: &mut Mac) -> Result<(), VMError> {
        Ok(())
    }

    fn ecall(&mut self, machine: &mut Mac) -> Result<bool, VMError> {
        if machine.registers()[A7].to_u64() != CURRENT_CYCLES {
            return Ok(false);
        }
        let cycles = self
            .base
            .lock()
            .map_err(|e| VMError::Unexpected(e.to_string()))?
            .checked_add(machine.cycles())
            .ok_or(VMError::CyclesOverflow)?;
        machine.set_register(A0, Mac::REG::from_u64(cycles));
        Ok(true)
    }
}