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Work out routine-vector type compatibility, w/ one failing test.

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Chris Pressey 2018-04-18 10:13:15 +01:00
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tests/SixtyPical Analysis.md
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@ -2223,21 +2223,30 @@ as an input to, an output of, or as a trashed value of a routine.
| } | }
? ConstantConstraintError: foo ? ConstantConstraintError: foo
You can copy the address of a routine into a vector, if that vector is #### routine-vector type compatibility
declared appropriately.
You can copy the address of a routine into a vector, if that vector type
is at least as "wide" as the type of the routine. More specifically,
- the vector must take _exactly_ the same inputs as the routine
- the vector must make _exactly_ the same outputs as the routine
- the vector must trash _at least_ what the routine trashes
If the vector and the routine have the very same signature, that's not an error.
| vector routine | vector routine
| inputs x | inputs x, y
| outputs x | outputs x, y
| trashes z, n | trashes z, n
| vec | vec
| |
| routine foo | routine foo
| inputs x | inputs x, y
| outputs x | outputs x, y
| trashes z, n | trashes z, n
| { | {
| inc x | inc x
| inc y
| } | }
| |
| routine main | routine main
@ -2248,20 +2257,48 @@ declared appropriately.
| } | }
= ok = ok
But not if the vector is declared inappropriately. If the vector takes an input that the routine doesn't take, that's not an error.
(The interface requires that a parameter be specified before calling, but the
implementation doesn't actually read it.)
| vector routine | vector routine
| inputs y | inputs x, y, a
| outputs y | outputs x, y
| trashes z, n | trashes z, n
| vec | vec
| |
| routine foo | routine foo
| inputs x | inputs x, y
| outputs x | outputs x, y
| trashes z, n | trashes z, n
| { | {
| inc x | inc x
| inc y
| }
|
| routine main
| outputs vec
| trashes a, z, n
| {
| copy foo, vec
| }
= ok
If the vector fails to take an input that the routine takes, that's an error.
| vector routine
| inputs x
| outputs x, y
| trashes z, n
| vec
|
| routine foo
| inputs x, y
| outputs x, y
| trashes z, n
| {
| inc x
| inc y
| } | }
| |
| routine main | routine main
@ -2272,21 +2309,99 @@ But not if the vector is declared inappropriately.
| } | }
? IncompatibleConstraintsError ? IncompatibleConstraintsError
"Appropriately" means, if the routine affects no more than what is named If the vector produces an output that the routine doesn't produce, that's an error.
in the input/output sets of the vector.
| vector routine | vector routine
| inputs a, x | inputs x, y
| outputs x, y, a
| trashes z, n
| vec
|
| routine foo
| inputs x, y
| outputs x, y
| trashes z, n
| {
| inc x
| inc y
| }
|
| routine main
| outputs vec
| trashes a, z, n
| {
| copy foo, vec
| }
? IncompatibleConstraintsError
If the vector fails to produce an output that the routine produces, that's an error.
| vector routine
| inputs x, y
| outputs x | outputs x
| trashes z, n
| vec
|
| routine foo
| inputs x, y
| outputs x, y
| trashes z, n
| {
| inc x
| inc y
| }
|
| routine main
| outputs vec
| trashes a, z, n
| {
| copy foo, vec
| }
? IncompatibleConstraintsError
If the vector fails to trash something the routine trashes, that's an error.
| vector routine
| inputs x, y
| outputs x, y
| trashes z
| vec
|
| routine foo
| inputs x, y
| outputs x, y
| trashes z, n
| {
| inc x
| inc y
| }
|
| routine main
| outputs vec
| trashes a, z, n
| {
| copy foo, vec
| }
? IncompatibleConstraintsError
If the vector trashes something the routine doesn't trash, that's not an error.
(The implementation preserves something the interface doesn't guarantee is
preserved. The caller gets no guarantee that it's preserved. It actually is,
but it doesn't know that.)
| vector routine
| inputs x, y
| outputs x, y
| trashes a, z, n | trashes a, z, n
| vec | vec
| |
| routine foo | routine foo
| inputs x | inputs x, y
| outputs x | outputs x, y
| trashes z, n | trashes z, n
| { | {
| inc x | inc x
| inc y
| } | }
| |
| routine main | routine main
@ -2297,6 +2412,8 @@ in the input/output sets of the vector.
| } | }
= ok = ok
#### other properties of routines
Routines are read-only. Routines are read-only.
| vector routine | vector routine