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yysymbol_type_t: always assign an enumerator

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Currently we define enumerators only for symbols that have an
identifier.  That rules out tokens such as '+', and nonterminals such
as foo-bar and foo.bar.  As a consequence we are taking chances: the
compiler might compile yysymbol_type_t as too small an integral type
for some symbol codes.

* data/skeletons/bison.m4 (b4_symbol_sid): Forge a unique symbol
identifier for symbols that don't have an ID.
This commit is contained in:
Akim Demaille
2020-03-29 11:14:15 +02:00
parent ecc3a13c34
commit fd37eb057e
1 changed files with 7 additions and 4 deletions
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11
data/skeletons/bison.m4
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@@ -407,8 +407,10 @@ m4_define([_b4_symbol],
# b4_symbol_sid(NUM)
# ------------------
# Build the symbol ID based for this symbol. Return empty
# if that would produce an invalid symbol.
# Build the symbol ID based for this symbol. It must always exist,
# otherwise some symbols might not be represented in the enum, which
# might be compiled into too small a type to contain all the symbol
# numbers.
m4_define([b4_symbol_sid],
[m4_case([$1],
[-2], [[YYSYMBOL_YYEMPTY]],
@@ -417,8 +419,9 @@ m4_define([b4_symbol_sid],
[$accept], [[YYSYMBOL_YYACCEPT]],
[error], [[YYSYMBOL_YYERROR]],
[$undefined], [[YYSYMBOL_YYUNDEF]],
[m4_quote(b4_symbol_if([$1], [has_id],
[[YYSYMBOL_]]m4_quote(_b4_symbol([$1], [id]))))])])])
[b4_symbol_if([$1], [has_id],
[[YYSYMBOL_]]m4_quote(_b4_symbol([$1], [id])),
[[YYSYMBOL_$1_][]m4_bpatsubst(m4_quote(_b4_symbol([$1], [tag])), [[^a-zA-Z_0-9]], [_])])])])])
# b4_symbol(NUM, FIELD)