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Initial work on adding 16-bit constants to a 16-bit location.

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This commit is contained in:
Chris Pressey 2017-12-07 11:31:46 +00:00
parent 031e4338ad
commit 97d00637d2
2 changed files with 51 additions and 2 deletions
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14
src/sixtypical/analyzer.py
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@ -2,7 +2,7 @@
from sixtypical.ast import Program, Routine, Block, Instr
from sixtypical.model import (
TYPE_BYTE, TYPE_BYTE_TABLE, BufferType, PointerType, VectorType, ExecutableType,
TYPE_BYTE, TYPE_WORD, TYPE_BYTE_TABLE, BufferType, PointerType, VectorType, ExecutableType,
ConstantRef, LocationRef, IndirectRef, AddressRef,
REG_A, REG_Y, FLAG_Z, FLAG_N, FLAG_V, FLAG_C
)
@ -233,7 +233,17 @@ class Analyzer(object):
)
context.assert_meaningful(src)
context.set_written(dest)
elif opcode in ('add', 'sub'):
elif opcode == 'add':
if src.type == TYPE_BYTE:
self.assert_type(TYPE_BYTE, src, dest)
context.assert_meaningful(src, dest, FLAG_C)
context.set_written(dest, FLAG_Z, FLAG_N, FLAG_C, FLAG_V)
else:
self.assert_type(TYPE_WORD, src, dest)
context.assert_meaningful(src, dest, FLAG_C)
context.set_written(dest, FLAG_Z, FLAG_N, FLAG_C, FLAG_V)
context.set_unmeaningful(REG_A)
elif opcode == 'sub':
self.assert_type(TYPE_BYTE, src, dest)
context.assert_meaningful(src, dest, FLAG_C)
context.set_written(dest, FLAG_Z, FLAG_N, FLAG_C, FLAG_V)

39
tests/SixtyPical Analysis.md
View File

@ -373,6 +373,45 @@ Can't `add` to a memory location that isn't writeable.
| }
? ForbiddenWriteError: a in main
You can `add` a word constant to a word memory location.
| word score
| routine main
| inputs a, score
| outputs score
| trashes a, c, z, v, n
| {
| st off, c
| add score, 1999
| }
= ok
`add`ing a word constant to a word memory location trashes `a`.
| word score
| routine main
| inputs a, score
| outputs score, a
| trashes c, z, v, n
| {
| st off, c
| add score, 1999
| }
? UnmeaningfulOutputError: a in main
Not sure why this doesn't also raise an error? `a` is trashed...
| word score
| routine main
| inputs score
| outputs score
| trashes c, z, v, n
| {
| st off, c
| add score, 1999
| }
? UnmeaningfulOutputError: a in main
### sub ###
Can't `sub` from or to a memory location that isn't initialized.