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| -rw-r--r-- | subx/035labels.cc | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/subx/035labels.cc b/subx/035labels.cc index b3638c8b..957fa5a0 100644 --- a/subx/035labels.cc +++ b/subx/035labels.cc @@ -1,6 +1,20 @@ //: Labels are defined by ending names with a ':'. This layer will compute //: addresses for labels, and compute the offset for instructions using them. +//: We're introducing non-number names for the first time, so it's worth +//: laying down some ground rules all transforms will follow, so things don't +//: get too confusing: +//: - if it starts with a digit, it's treated as a number. If it can't be +//: parsed as hex it will raise an error. +//: - if it starts with '-' it's treated as a number. +//: - if it starts with '0x' it's treated as a number. +//: - if it's two characters long, it can't be a name. Either it's a hex +//: byte, or it raises an error. +//: That's it. Names can start with any non-digit that isn't a dash. They can +//: be a single character long. 'a' is not a hex number, it's a variable. +//: Later layers may add more conventions partitioning the space of names. But +//: the above rules will remain inviolate. + :(scenarios transform) :(scenario map_label) == 0x1 |