Deserialize macro history when we deserialize an identifier that has

macro history.

When deserializing macro history, we arrange history such that the
macros that have definitions (that haven't been #undef'd) and are
visible come at the beginning of the list, which is what the
preprocessor and other clients of Preprocessor::getMacroInfo()
expect. If additional macro definitions become visible later, they'll
be moved toward the front of the list. Note that it's possible to have
ambiguities, but we don't diagnose them yet.

There is a partially-implemented design decision here that, if a
particular identifier has been defined or #undef'd within the
translation unit, that definition (or #undef) hides any macro
definitions that come from imported modules. There's still a little
work to do to ensure that the right #undef'ing happens.

Additionally, we'll need to scope the update records for #undefs, so
they only kick in when the submodule containing that update record
becomes visible.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@165682 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 0 insertions, 3 deletions

diff --git a/include/clang/Lex/ExternalPreprocessorSource.h b/include/clang/Lex/ExternalPreprocessorSource.h
index f172b5c8d2..d2e2412192 100644
--- a/include/clang/Lex/ExternalPreprocessorSource.h
+++ b/include/clang/Lex/ExternalPreprocessorSource.h
@@ -28,9 +28,6 @@ public:
   /// \brief Read the set of macros defined by this external macro source.
   virtual void ReadDefinedMacros() = 0;
   
-  /// \brief Read the definition for the given macro.
-  virtual void LoadMacroDefinition(IdentifierInfo *II) = 0;
-  
   /// \brief Update an out-of-date identifier.
   virtual void updateOutOfDateIdentifier(IdentifierInfo &II) = 0;
 };