from nmigen import *
from nmigen.test.utils import *
from ..core import *
from ....checks.pc_bwd_check import *

class PcBwdSpec(Elaboratable):
    def elaborate(self, platform):
        m = Module()

        m.submodules.cpu = cpu = Minerva(with_rvfi=True)
        m.submodules.pc_bwd_spec = pc_bwd_spec = PcBwdCheck(RISCV_FORMAL_XLEN=32, rvformal_addr_valid=lambda x:Const(1))

        m.d.comb += pc_bwd_spec.reset.eq(0)
        m.d.comb += pc_bwd_spec.check.eq(1)

        m.d.comb += pc_bwd_spec.rvfi_valid.eq(cpu.rvfi.valid)
        m.d.comb += pc_bwd_spec.rvfi_order.eq(cpu.rvfi.order)
        m.d.comb += pc_bwd_spec.rvfi_pc_rdata.eq(cpu.rvfi.pc_rdata)
        m.d.comb += pc_bwd_spec.rvfi_pc_wdata.eq(cpu.rvfi.pc_wdata)

        return m

class PcBwdTestCase(FHDLTestCase):
    def verify(self):
        self.assertFormal(PcBwdSpec(), mode="bmc", depth=12, engine="smtbmc --nopresat")