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Use $accept and $end, as BYacc and BTYacc do, instead of $axiom and $.

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* src/symtab.h, src/symtab.c (eoftoken, axiom): Rename as...
(endtoken, accept): these.
* src/reader.c (reader): Set endtoken's default tag to "$end".
Set undeftoken's tag to "$undefined" instead of "$undefined.".
* doc/bison.texinfo (Table of Symbols): Mention $accept and $end.
Adjust.
This commit is contained in:
Akim Demaille
2002-07-29 17:30:33 +00:00
parent 1bfb97dba5
commit 88bce5a2ef
15 changed files with 163 additions and 131 deletions
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10
src/reduce.c
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@@ -161,9 +161,9 @@ inaccessable_symbols (void)
Pp = bitset_create (nrules, BITSET_FIXED);
/* If the start symbol isn't useful, then nothing will be useful. */
if (bitset_test (N, axiom->number - ntokens))
if (bitset_test (N, accept->number - ntokens))
{
bitset_set (V, axiom->number);
bitset_set (V, accept->number);
while (1)
{
@@ -194,7 +194,7 @@ inaccessable_symbols (void)
V = Vp;
/* Tokens 0, 1, and 2 are internal to Bison. Consider them useful. */
bitset_set (V, eoftoken->number); /* end-of-input token */
bitset_set (V, endtoken->number); /* end-of-input token */
bitset_set (V, errtoken->number); /* error token */
bitset_set (V, undeftoken->number); /* some undefined token */
@@ -333,7 +333,7 @@ nonterminals_reduce (void)
if (ISVAR (*rhsp))
*rhsp = symbol_number_as_item_number (nontermmap[*rhsp]);
}
axiom->number = nontermmap[axiom->number];
accept->number = nontermmap[accept->number];
}
nsyms -= nuseless_nonterminals;
@@ -438,7 +438,7 @@ reduce_grammar (void)
reduce_print ();
if (!bitset_test (N, axiom->number - ntokens))
if (!bitset_test (N, accept->number - ntokens))
fatal_at (startsymbol_location,
_("start symbol %s does not derive any sentence"),
startsymbol->tag);