[PCH/Modules] De/Serialize MacroInfos separately than MacroDirectives.

-Serialize the macro directives history into its own section
-Get rid of the macro updates section
-When de/serializing an identifier from a module, associate only one macro per
 submodule that defined+exported it.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@177761 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 15 insertions, 5 deletions

diff --git a/include/clang/Serialization/ASTBitCodes.h b/include/clang/Serialization/ASTBitCodes.h
index 46380ed8bf..9b685ba118 100644
--- a/include/clang/Serialization/ASTBitCodes.h
+++ b/include/clang/Serialization/ASTBitCodes.h
@@ -129,7 +129,14 @@ namespace clang {
 
     /// \brief An ID number that refers to a macro in an AST file.
     typedef uint32_t MacroID;
-    
+
+    /// \brief A global ID number that refers to a macro in an AST file.
+    typedef uint32_t GlobalMacroID;
+
+    /// \brief A local to a module ID number that refers to a macro in an
+    /// AST file.
+    typedef uint32_t LocalMacroID;
+
     /// \brief The number of predefined macro IDs.
     const unsigned int NUM_PREDEF_MACRO_IDS = 1;
 
@@ -522,9 +529,9 @@ namespace clang {
       /// macro definition.
       MACRO_OFFSET = 47,
 
-      /// \brief Record of updates for a macro that was modified after
-      /// being deserialized.
-      MACRO_UPDATES = 48,
+      /// \brief Mapping table from the identifier ID to the offset of the
+      /// macro directive history for the identifier.
+      MACRO_TABLE = 48,
 
       /// \brief Record code for undefined but used functions and variables that
       /// need a definition in this TU.
@@ -565,7 +572,10 @@ namespace clang {
 
       /// \brief Describes one token.
       /// [PP_TOKEN, SLoc, Length, IdentInfoID, Kind, Flags]
-      PP_TOKEN = 3
+      PP_TOKEN = 3,
+
+      /// \brief The macro directives history for a particular identifier.
+      PP_MACRO_DIRECTIVE_HISTORY = 4
     };
 
     /// \brief Record types used within a preprocessor detail block.