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* genprotsym.txr: Sort groups so that the protsym.c
deltas, going forward, are more stable.
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* genprotsym.txr: use @(first) directive trick to
eliminate leading blank lines in front of items
that are not controlled by a preprocessor symbol.
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In sysif.c, we have conditionally defined symbol variables.
This has to be reflected with #if directivec in protsym.c.
* genprotsym.txr: Associate each symbol with a list
of preprocessor symbols which controls it, via a hash.
All symbols coming from a conditional file are tagged with
a list which includes at least the controlling symbol.
If symbols are wrapped with #if <sym> directives, that
is added. Nesting is supported. We group the symbols
according to their controlling preprocessor symbol lists.
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The protsym.c generated file refers to symbol variables
without regard for whether they actually exist.
Some symbol variables are defined in source files whose
object files are only linked in conditionally.
* genprotsym.txr: Update the logic to scan the Makefile
to determine which files are conditionally included, based on
what makefile flag, which is related to a preprocessor symbol.
Thus, with some hashes, for each symbolic variable we
subsequently scan, we know whether it came from a file that is
associated with a preprocessor symbol. We group the emitted
material accordingly, placing the conditionally existent
symbols into #if...#endif blocks.
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Issue: TXR holds numerous symbol references in global
variables, like list_s. These variables are not registered as
root pointers with the garbage collector. This is normally
okay because symbols are reachable via packages. However,
if such a symbol is uninterned, that causes an integrity problem.
Solution: protect those symbols from being removed from their
packages.
* Makefile (OBJS): Add protsym.o.
* genprotsym.txr, protsym.c: New files.
* lib.c (prot_sym_check): New static function.
(use_sym, uintern, rehome_sym): Use prot_sym_check to
implement a defense against internal symbols being booted
out of their package.
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