waffles-solana-bpf-loader-program 1.16.0

Waffle Labs maintained Solana BPF loader
Documentation 
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use {super::*, crate::declare_syscall};

fn get_sysvar<T: std::fmt::Debug + Sysvar + SysvarId + Clone>(
    sysvar: Result<Arc<T>, InstructionError>,
    var_addr: u64,
    check_aligned: bool,
    memory_mapping: &mut MemoryMapping,
    invoke_context: &mut InvokeContext,
) -> Result<u64, EbpfError> {
    consume_compute_meter(
        invoke_context,
        invoke_context
            .get_compute_budget()
            .sysvar_base_cost
            .saturating_add(size_of::<T>() as u64),
    )?;
    let var = translate_type_mut::<T>(memory_mapping, var_addr, check_aligned)?;

    let sysvar: Arc<T> = sysvar.map_err(SyscallError::InstructionError)?;
    *var = T::clone(sysvar.as_ref());

    Ok(SUCCESS)
}

declare_syscall!(
    /// Get a Clock sysvar
    SyscallGetClockSysvar,
    fn inner_call(
        invoke_context: &mut InvokeContext,
        var_addr: u64,
        _arg2: u64,
        _arg3: u64,
        _arg4: u64,
        _arg5: u64,
        memory_mapping: &mut MemoryMapping,
    ) -> Result<u64, EbpfError> {
        get_sysvar(
            invoke_context.get_sysvar_cache().get_clock(),
            var_addr,
            invoke_context.get_check_aligned(),
            memory_mapping,
            invoke_context,
        )
    }
);

declare_syscall!(
    /// Get a EpochSchedule sysvar
    SyscallGetEpochScheduleSysvar,
    fn inner_call(
        invoke_context: &mut InvokeContext,
        var_addr: u64,
        _arg2: u64,
        _arg3: u64,
        _arg4: u64,
        _arg5: u64,
        memory_mapping: &mut MemoryMapping,
    ) -> Result<u64, EbpfError> {
        get_sysvar(
            invoke_context.get_sysvar_cache().get_epoch_schedule(),
            var_addr,
            invoke_context.get_check_aligned(),
            memory_mapping,
            invoke_context,
        )
    }
);

declare_syscall!(
    /// Get a Fees sysvar
    SyscallGetFeesSysvar,
    fn inner_call(
        invoke_context: &mut InvokeContext,
        var_addr: u64,
        _arg2: u64,
        _arg3: u64,
        _arg4: u64,
        _arg5: u64,
        memory_mapping: &mut MemoryMapping,
    ) -> Result<u64, EbpfError> {
        #[allow(deprecated)]
        {
            get_sysvar(
                invoke_context.get_sysvar_cache().get_fees(),
                var_addr,
                invoke_context.get_check_aligned(),
                memory_mapping,
                invoke_context,
            )
        }
    }
);

declare_syscall!(
    /// Get a Rent sysvar
    SyscallGetRentSysvar,
    fn inner_call(
        invoke_context: &mut InvokeContext,
        var_addr: u64,
        _arg2: u64,
        _arg3: u64,
        _arg4: u64,
        _arg5: u64,
        memory_mapping: &mut MemoryMapping,
    ) -> Result<u64, EbpfError> {
        get_sysvar(
            invoke_context.get_sysvar_cache().get_rent(),
            var_addr,
            invoke_context.get_check_aligned(),
            memory_mapping,
            invoke_context,
        )
    }
);