Parsing C with missing typedefs

Hi there,


does anyone know how I can parse C when typedefs are missing.
You are eg. confronted with


typedef int INT;
INT i;


When the first line is missing from the source code you get in troubles.


Within my lex/yacc-based parser I used the ANSI-grammar from
Kernighan/Ritchie. Using this grammar the scanner has to decide
if an integer-like token is a typedef name or not. I implemented this
feature using a symbol table for typedef names.


How can I proceed when type definitions can be missing. The scanner
cannot rely on his symbol table any more.
I tried operating with a lookahead in the identifier rule. But this does


not seem to be powerful enough.


Thanks for any help,
Bernt Kullbach (kullbach@uni-koblenz.de)
[Seems pretty hard, since typedef in effect invents new keywords. Perhaps
some of the general purpose error correction work might be useful, or you
could do something gross and ad-hoc like backup and do a trial reparse
pretending the undefined identifier is a type. -John]

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