Allow copying a routine directly into a vector table.

src/sixtypical/analyzer.py

@@ -3,7 +3,7 @@
 from sixtypical.ast import Program, Routine, Block, Instr
 from sixtypical.model import (
     TYPE_BYTE, TYPE_WORD,
-    TableType, BufferType, PointerType, VectorType, ExecutableType,
+    TableType, BufferType, PointerType, VectorType, ExecutableType, RoutineType,
     ConstantRef, LocationRef, IndirectRef, IndexedRef, AddressRef,
     REG_A, REG_Y, FLAG_Z, FLAG_N, FLAG_V, FLAG_C
 )
@@ -141,6 +141,9 @@ class Context(object):
 
     def set_touched(self, *refs):
         for ref in refs:
+            # FIXME review the whole "touched" thing.  what does it even mean?  how is it different from "written"?
+            if isinstance(ref.type, RoutineType):
+                continue
             self._touched.add(ref)
 
     def set_meaningful(self, *refs):
@@ -364,8 +367,8 @@ class Analyzer(object):
             elif isinstance(src, (LocationRef, ConstantRef)) and isinstance(dest, IndexedRef):
                 if src.type == TYPE_WORD and TableType.is_a_table_type(dest.ref.type, TYPE_WORD):
                     pass
-                elif isinstance(src.type, VectorType) and isinstance(dest.ref.type, TableType) and dest.ref.type.of_type == src.type:
+                elif (isinstance(src.type, ExecutableType) and isinstance(dest.ref.type, TableType) and
-                    # TODO ideally we'd check if the vectors in the table are compatible, rather than equal, to the src
+                      ExecutableType.executable_types_compatible(src.type, dest.ref.type.of_type)):
                     pass
                 else:
                     raise TypeMismatchError((src, dest))
@@ -373,8 +376,8 @@ class Analyzer(object):
             elif isinstance(src, IndexedRef) and isinstance(dest, LocationRef):
                 if TableType.is_a_table_type(src.ref.type, TYPE_WORD) and dest.type == TYPE_WORD:
                     pass
-                elif isinstance(dest.type, VectorType) and isinstance(src.ref.type, TableType) and src.ref.type.of_type == dest.type:
+                elif (isinstance(src.ref.type, TableType) and isinstance(dest.type, VectorType) and
-                    # TODO ideally we'd check if the vectors in the table are compatible, rather than equal, to the src
+                      ExecutableType.executable_types_compatible(src.ref.type.of_type, dest.type)):
                     pass
                 else:
                     raise TypeMismatchError((src, dest))

src/sixtypical/model.py

@@ -47,6 +47,19 @@ class ExecutableType(Type):
     def __hash__(self):
         return hash(self.name) ^ hash(self.inputs) ^ hash(self.outputs) ^ hash(self.trashes)
 
+    @classmethod
+    def executable_types_compatible(cls_, src, dest):
+        """Returns True iff a value of type `src` can be assigned to a storage location of type `dest`."""
+        if isinstance(src, ExecutableType) and isinstance(dest, VectorType):
+            # TODO: I'm sure we can replace some of these with subset-containment, but that requires thought
+            return (
+                src.inputs == dest.inputs and
+                src.outputs == dest.outputs and
+                src.trashes == dest.trashes
+            )
+        else:
+            return False
+
 
 class RoutineType(ExecutableType):
     """This memory location contains the code for a routine."""

tests/SixtyPical Analysis.md

@@ -1892,9 +1892,9 @@ vector says it does.
     | }
     = ok
 
-### vector table ###
+### Vector tables ###
 
-Copying to and from a vector table.
+A vector can be copied into a vector table.
 
     | vector one
     |   outputs x
@@ -1915,7 +1915,70 @@ Copying to and from a vector table.
     |     ld x, 0
     |     copy bar, one
     |     copy one, many + x
+    | }
+    = ok
+
+A vector can be copied out of a vector table.
+
+    | vector one
+    |   outputs x
+    |   trashes a, z, n
+    | vector table[256] many
+    |   outputs x
+    |   trashes a, z, n
+    | 
+    | routine bar outputs x trashes a, z, n {
+    |     ld x, 200
+    | }
+    | 
+    | routine main
+    |   inputs one, many
+    |   outputs one, many
+    |   trashes a, x, n, z
+    | {
+    |     ld x, 0
     |     copy many + x, one
     |     call one
     | }
     = ok
+
+A routine can be copied into a vector table.
+
+    | vector table[256] many
+    |   outputs x
+    |   trashes a, z, n
+    | 
+    | routine bar outputs x trashes a, z, n {
+    |     ld x, 200
+    | }
+    | 
+    | routine main
+    |   inputs many
+    |   outputs many
+    |   trashes a, x, n, z
+    | {
+    |     ld x, 0
+    |     copy bar, many + x
+    | }
+    = ok
+
+A vector in a vector table cannot be directly called.
+
+    | vector table[256] many
+    |   outputs x
+    |   trashes a, z, n
+    | 
+    | routine bar outputs x trashes a, z, n {
+    |     ld x, 200
+    | }
+    | 
+    | routine main
+    |   inputs many
+    |   outputs many
+    |   trashes a, x, n, z
+    | {
+    |     ld x, 0
+    |     copy bar, many + x
+    |     call many + x
+    | }
+    ? ValueError