USING: compiler.cfg.instructions compiler.cfg.write-barrier
tools.test ;
IN: compiler.cfg.write-barrier.tests

! Do need a write barrier on a random store.
{
    V{
        T{ peek## f 1 }
        T{ set-slot## f 2 1 3 }
        T{ write-barrier## f 1 3 }
    }
} [
    V{
        T{ peek## f 1 }
        T{ set-slot## f 2 1 3 }
        T{ write-barrier## f 1 3 }
    } write-barriers-step
] unit-test

{
    V{
        T{ peek## f 1 }
        T{ set-slot-imm## f 2 1 }
        T{ write-barrier-imm## f 1 }
    }
} [
    V{
        T{ peek## f 1 }
        T{ set-slot-imm## f 2 1 }
        T{ write-barrier-imm## f 1 }
    } write-barriers-step
] unit-test

! Don't need a write barrier on freshly allocated objects.
{
    V{
        T{ allot## f 1 }
        T{ set-slot## f 2 1 3 }
    }
} [
    V{
        T{ allot## f 1 }
        T{ set-slot## f 2 1 3 }
        T{ write-barrier## f 1 3 }
    } write-barriers-step
] unit-test

{
    V{
        T{ allot## f 1 }
        T{ set-slot-imm## f 2 1 }
    }
} [
    V{
        T{ allot## f 1 }
        T{ set-slot-imm## f 2 1 }
        T{ write-barrier-imm## f 1 }
    } write-barriers-step
] unit-test

! Do need a write barrier if there's a subroutine call between
! the allocation and the store.
{
    V{
        T{ allot## f 1 }
        T{ box## }
        T{ set-slot## f 2 1 3 }
        T{ write-barrier## f 1 3 }
    }
} [
    V{
        T{ allot## f 1 }
        T{ box## }
        T{ set-slot## f 2 1 3 }
        T{ write-barrier## f 1 3 }
    } write-barriers-step
] unit-test

{
    V{
        T{ allot## f 1 }
        T{ box## }
        T{ set-slot-imm## f 2 1 }
        T{ write-barrier-imm## f 1 }
    }
} [
    V{
        T{ allot## f 1 }
        T{ box## }
        T{ set-slot-imm## f 2 1 }
        T{ write-barrier-imm## f 1 }
    } write-barriers-step
] unit-test

! copy## instructions
{
    V{
        T{ copy## f 2 1 }
        T{ set-slot-imm## f 3 1 }
        T{ write-barrier-imm## f 2 }
    }
} [
    V{
        T{ copy## f 2 1 }
        T{ set-slot-imm## f 3 1 }
        T{ write-barrier-imm## f 2 }
    } write-barriers-step
] unit-test

{
    V{
        T{ copy## f 2 1 }
        T{ set-slot-imm## f 3 2 }
        T{ write-barrier-imm## f 1 }
    }
} [
    V{
        T{ copy## f 2 1 }
        T{ set-slot-imm## f 3 2 }
        T{ write-barrier-imm## f 1 }
    } write-barriers-step
] unit-test

{
    V{
        T{ copy## f 2 1 }
        T{ copy## f 3 2 }
        T{ set-slot-imm## f 3 1 }
        T{ write-barrier-imm## f 2 }
    }
} [
    V{
        T{ copy## f 2 1 }
        T{ copy## f 3 2 }
        T{ set-slot-imm## f 3 1 }
        T{ write-barrier-imm## f 2 }
    } write-barriers-step
] unit-test

{
    V{
        T{ copy## f 2 1 }
        T{ copy## f 3 2 }
        T{ set-slot-imm## f 4 1 }
        T{ write-barrier-imm## f 3 }
    }
} [
    V{
        T{ copy## f 2 1 }
        T{ copy## f 3 2 }
        T{ set-slot-imm## f 4 1 }
        T{ write-barrier-imm## f 3 }
    } write-barriers-step
] unit-test