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goto is no longer restricted to appearing in tail position.

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This commit is contained in:
Chris Pressey
2018-11-27 14:25:43 +00:00
parent 9364a5fbec
commit 6dbce205d1
4 changed files with 52 additions and 16 deletions
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tests/SixtyPical Analysis.md
+47 -12
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@@ -2280,7 +2280,7 @@ But only if they are bytes.
| }
? TypeMismatchError
A `goto` cannot appear within a `save` block, even if it is otherwise in tail position.
A `goto` cannot appear within a `save` block.
| define other routine
| trashes a, z, n
@@ -2325,8 +2325,7 @@ A `goto` cannot appear within a `save` block, even if it is otherwise in tail po
| }
= ok
A `goto` cannot appear within a `with interrupts` block, even if it is
otherwise in tail position.
A `goto` cannot appear within a `with interrupts` block.
| vector routine
| inputs x
@@ -2973,7 +2972,26 @@ Calling the vector does indeed trash the things the vector says it does.
| }
? UnmeaningfulOutputError: x
`goto`, if present, must be in tail position (the final instruction in a routine.)
For now at least, you cannot have a `goto` inside a loop.
| define bar routine trashes x, z, n {
| ld x, 200
| }
|
| define main routine trashes x, z, n {
| ld x, 0
| repeat {
| inc x
| goto bar
| } until z
| }
? IllegalJumpError
`goto`, as a matter of syntax, can only appear at the end
of a block; but it need not be the final instruction in a
routine. It is only important that the type context at every
`goto` is compatible with the type context at the end of
the routine.
| define bar routine trashes x, z, n {
| ld x, 200
@@ -2995,9 +3013,8 @@ Calling the vector does indeed trash the things the vector says it does.
| ld x, 1
| goto bar
| }
| ld x, 0
| }
? IllegalJumpError
= ok
| define bar routine trashes x, z, n {
| ld x, 200
@@ -3009,6 +3026,7 @@ Calling the vector does indeed trash the things the vector says it does.
| ld x, 1
| goto bar
| }
| goto bar
| }
= ok
@@ -3024,7 +3042,7 @@ Calling the vector does indeed trash the things the vector says it does.
| }
| ld x, 0
| }
? IllegalJumpError
= ok
| define bar routine trashes x, z, n {
| ld x, 200
@@ -3057,7 +3075,21 @@ Calling the vector does indeed trash the things the vector says it does.
| }
= ok
For the purposes of `goto`, the end of a loop is never tail position.
| define bar routine trashes x, z, n {
| ld x, 200
| }
|
| define main routine trashes x, z, n {
| ld x, 0
| if z {
| ld x, 1
| goto bar
| } else {
| ld x, 0
| }
| ld x, 0
| }
= ok
| define bar routine trashes x, z, n {
| ld x, 200
@@ -3065,12 +3097,15 @@ For the purposes of `goto`, the end of a loop is never tail position.
|
| define main routine trashes x, z, n {
| ld x, 0
| repeat {
| inc x
| if z {
| ld x, 1
| goto bar
| } until z
| } else {
| ld x, 0
| }
| goto bar
| }
? IllegalJumpError
= ok
Can't `goto` a routine that outputs or trashes more than the current routine.