fuel-vm 0.35.4

FuelVM interpreter.
Documentation 
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use super::{
    internal::{
        append_receipt,
        inc_pc,
        internal_contract_or_default,
        AppendReceipt,
    },
    receipts::ReceiptsCtx,
    ExecutableTransaction,
    Interpreter,
};
use crate::{
    constraints::reg_key::*,
    consts::*,
    context::Context,
    error::RuntimeError,
};

use fuel_asm::PanicReason;
use fuel_tx::{
    Receipt,
    Script,
};
use fuel_types::Word;

#[cfg(test)]
mod tests;

impl<S, Tx> Interpreter<S, Tx>
where
    Tx: ExecutableTransaction,
{
    pub(crate) fn log(
        &mut self,
        a: Word,
        b: Word,
        c: Word,
        d: Word,
    ) -> Result<(), RuntimeError> {
        let (SystemRegisters { fp, is, pc, .. }, _) =
            split_registers(&mut self.registers);
        let input = LogInput {
            memory: &mut self.memory,
            tx_offset: self.params.tx_offset(),
            context: &self.context,
            receipts: &mut self.receipts,
            script: self.tx.as_script_mut(),
            fp: fp.as_ref(),
            is: is.as_ref(),
            pc,
        };
        input.log(a, b, c, d)
    }

    pub(crate) fn log_data(
        &mut self,
        a: Word,
        b: Word,
        c: Word,
        d: Word,
    ) -> Result<(), RuntimeError> {
        let (SystemRegisters { fp, is, pc, .. }, _) =
            split_registers(&mut self.registers);
        let input = LogInput {
            memory: &mut self.memory,
            tx_offset: self.params.tx_offset(),
            context: &self.context,
            receipts: &mut self.receipts,
            script: self.tx.as_script_mut(),
            fp: fp.as_ref(),
            is: is.as_ref(),
            pc,
        };
        input.log_data(a, b, c, d)
    }
}

struct LogInput<'vm> {
    memory: &'vm mut [u8; MEM_SIZE],
    tx_offset: usize,
    context: &'vm Context,
    receipts: &'vm mut ReceiptsCtx,
    script: Option<&'vm mut Script>,
    fp: Reg<'vm, FP>,
    is: Reg<'vm, IS>,
    pc: RegMut<'vm, PC>,
}

impl LogInput<'_> {
    pub(crate) fn log(
        self,
        a: Word,
        b: Word,
        c: Word,
        d: Word,
    ) -> Result<(), RuntimeError> {
        let receipt = Receipt::log(
            internal_contract_or_default(self.context, self.fp, self.memory),
            a,
            b,
            c,
            d,
            *self.pc,
            *self.is,
        );

        append_receipt(
            AppendReceipt {
                receipts: self.receipts,
                script: self.script,
                tx_offset: self.tx_offset,
                memory: self.memory,
            },
            receipt,
        );

        inc_pc(self.pc)
    }

    pub(crate) fn log_data(
        self,
        a: Word,
        b: Word,
        c: Word,
        d: Word,
    ) -> Result<(), RuntimeError> {
        if d > MEM_MAX_ACCESS_SIZE || c > VM_MAX_RAM - d {
            return Err(PanicReason::MemoryOverflow.into())
        }

        let cd = (c + d) as usize;

        let receipt = Receipt::log_data(
            internal_contract_or_default(self.context, self.fp, self.memory),
            a,
            b,
            c,
            *self.pc,
            *self.is,
            self.memory[c as usize..cd].to_vec(),
        );

        append_receipt(
            AppendReceipt {
                receipts: self.receipts,
                script: self.script,
                tx_offset: self.tx_offset,
                memory: self.memory,
            },
            receipt,
        );

        inc_pc(self.pc)
    }
}