Allow the preprocessor to cache the lexed tokens, so that we can do efficient lookahead and backtracking.
1) New public methods added:
-EnableBacktrackAtThisPos
-DisableBacktrack
-Backtrack
-isBacktrackEnabled
2) LookAhead() implementation is replaced with a more efficient one.
3) LookNext() is removed.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@54611 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/Preprocessor.cpp b/lib/Lex/Preprocessor.cpp
index 631b836..33c94b6 100644
--- a/lib/Lex/Preprocessor.cpp
+++ b/lib/Lex/Preprocessor.cpp
@@ -68,6 +68,9 @@
InMacroArgs = false;
NumCachedTokenLexers = 0;
+ CacheTokens = false;
+ CachedLexPos = 0;
+
// "Poison" __VA_ARGS__, which can only appear in the expansion of a macro.
// This gets unpoisoned where it is allowed.
(Ident__VA_ARGS__ = getIdentifierInfo("__VA_ARGS__"))->setIsPoisoned();
@@ -579,4 +582,3 @@
if (II.isExtensionToken() && Features.C99)
Diag(Identifier, diag::ext_token_used);
}
-