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Allow %start after the first rule.

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* src/reader.c (grammar_current_rule_begin): Don't set the start symbol
when parsing the first rule.
(check_and_convert_grammar): Search for it here after all grammar
declarations have been parsed.  Skip midrules, which have dummy LHS
nonterminals.
* src/symtab.c (symbol_is_dummy): New function.
* src/symtab.h (symbol_is_dummy): Declare it.
* tests/input.at (%start after first rule): New test.
This commit is contained in:
Joel E. Denny
2006-08-20 03:10:18 +00:00
parent 6d0ef4ec20
commit 4d7370cb4f
5 changed files with 58 additions and 7 deletions
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21
tests/input.at
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@@ -537,3 +537,24 @@ input.y:20.1: syntax error, unexpected end of file, expecting ;
]])
AT_CLEANUP
## ------------------------- ##
## %start after first rule. ##
## ------------------------- ##
AT_SETUP([%start after first rule])
# Bison once complained that a %start after the first rule was a redeclaration
# of the start symbol.
AT_DATA([input.y],
[[%%
false_start: ;
start: false_start ;
%start start;
]])
AT_CHECK([bison -o input.c input.y])
AT_CLEANUP