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Spec goto.

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Chris Pressey 2015-10-21 19:14:59 +01:00
parent ed44a8c1b9
commit 646ec38aa8
1 changed files with 25 additions and 6 deletions
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doc/SixtyPical.md
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@ -291,11 +291,12 @@ current routine, and it continues to be initialized afterwards.
Transfers execution to the given executable, whether that is a previously-
defined routine, or a vector location which contains the address of a routine
which will be called indirectly.
which will be called indirectly. Execution will be transferred back to the
current routine, when execution of the executable is finished.
Just before the call,
* It is illegal if any of the memory locations in the called routine's
* It is illegal if any of the memory locations in the target executable's
READS list is uninitialized.
Just after the call,
@ -305,6 +306,28 @@ Just after the call,
* All memory locations listed as TRASHED in the called routine's OUTPUTS
list are considered initialized.
### goto ###
goto <executable-name>
Unilaterally transfers execution to the given executable. Execution will not
be transferred back to the current routine when execution of the executable is
finished; rather, it will be transferred back to the caller of the current
routine.
If `goto` is used in a routine, it must be in tail position. That is, it
must be the final instruction in the routine.
Just before the goto,
* It is illegal if any of the memory locations in the target executable's
READS list is uninitialized.
In addition,
* The target executable's WRITES lists must not include any locations
that are not already included in the current routine's WRITES lists.
### if ###
if <src-memory-location> {
@ -363,10 +386,6 @@ copy more general types of data (for example, vectors,) and it trashes the
After execution, dest is considered initialized, and `z` and `n`, and
`a` are considered uninitialized.
### goto ###
TBW
Grammar
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