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Thu Feb 15 12:01:35 GMT 2007

dictionaries

i'm using a hash table to store 'core' macros: those that are
fixed. however, a forth program can create macros, so these need to be
defined somehow..

maybe make that a bit more strict?

the same goes for constants.. i'm using fixed machine constants in a
hash table, and some user defined stuff in other places.

this needs some serious thinking..

constants can be implemented as macros which inline literals. so the
only remaining question is: how to handle macros?

macros are really compiler extensions. they are a property of the
host, not of the target code.

it would be really inconvenient having to split a project into two
parts, so i should aim for macro defs inside source files. however, a
clear distinction needs to be made between host and target things:

target properties are related to on-chip storage == addresses

host properties are related to code generation only

the result is that there are 2 possible actions on a source file:
- reload macros + constants
- recompile = realloc code and data

to track the state of a project, the only thing that needs to be saved
is the source code + a dictionary of target addresses. all the rest
(macros) can be obtained directly from the source code.

actually, this is a lot better than the old approach, where macros are
stored in a project state file.





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