Introduce a new libclang parsing flag,
CXTranslationUnit_NestedMacroInstantiations, which indicates whether
we want to see "nested" macro instantiations (e.g., those that occur
inside other macro instantiations) within the detailed preprocessing
record. Many clients (e.g., those that only care about visible tokens)
don't care about this information, and in code that uses preprocessor
metaprogramming, this information can have a very high cost.
Addresses <rdar://problem/9389320>.
llvm-svn: 130990
diff --git a/clang/lib/Lex/PreprocessingRecord.cpp b/clang/lib/Lex/PreprocessingRecord.cpp
index 9555611..0c8d948 100644
--- a/clang/lib/Lex/PreprocessingRecord.cpp
+++ b/clang/lib/Lex/PreprocessingRecord.cpp
@@ -45,8 +45,9 @@
ExternalSource->ReadPreprocessedEntities();
}
-PreprocessingRecord::PreprocessingRecord()
- : ExternalSource(0), NumPreallocatedEntities(0),
+PreprocessingRecord::PreprocessingRecord(bool IncludeNestedMacroInstantiations)
+ : IncludeNestedMacroInstantiations(IncludeNestedMacroInstantiations),
+ ExternalSource(0), NumPreallocatedEntities(0),
LoadedPreallocatedEntities(false)
{
}
@@ -120,6 +121,9 @@
}
void PreprocessingRecord::MacroExpands(const Token &Id, const MacroInfo* MI) {
+ if (!IncludeNestedMacroInstantiations && Id.getLocation().isMacroID())
+ return;
+
if (MacroDefinition *Def = findMacroDefinition(MI))
PreprocessedEntities.push_back(
new (*this) MacroInstantiation(Id.getIdentifierInfo(),