[cfe-dev] Returning original parsing state after parsing arbitrary tokens

[ja_comp]

Assume that a program did the following:

1) Called EnterTokenStream with arbitrary tokens (followed by a Semicolon
and Eof)
2) Called setSuppressAllDiagnostics(true) to keep from emitting errors (in
case the next step fails)
3) Called ParseStatement to produce a StmtResult from the additional tokens
(which may or may not produce a valid result)
4) Lexed tokens (if necessary) to remove any unlexed added tokens
5) Called setSuppressAllDiagnostics(false) to restore error handling

What variables and/or other states should be saved to return the
Preprocessor/Parser/Lexer to the state they were in before step 1?



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