Read/write from/to PCH the diagnostic mappings that the user set so that e.g. #pragma clang diagnostic can be used in a PCH.

Fixes rdar://8435969.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@118303 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 17 insertions, 0 deletions

diff --git a/lib/Serialization/ASTWriter.cpp b/lib/Serialization/ASTWriter.cpp
index 47ef72f7bd..a5977f5cfe 100644
--- a/lib/Serialization/ASTWriter.cpp
+++ b/lib/Serialization/ASTWriter.cpp
@@ -1441,6 +1441,19 @@ void ASTWriter::WritePreprocessor(const Preprocessor &PP) {
   }
 }
 
+void ASTWriter::WriteUserDiagnosticMappings(const Diagnostic &Diag) {
+  RecordData Record;
+  for (unsigned i = 0; i != diag::DIAG_UPPER_LIMIT; ++i) {
+    diag::Mapping Map = Diag.getDiagnosticMappingInfo(i);
+    if (Map & 0x8) { // user mapping.
+      Record.push_back(i);
+      Record.push_back(Map & 0x7);
+    }
+  }
+
+  Stream.EmitRecord(DIAG_USER_MAPPINGS, Record);
+}
+
 //===----------------------------------------------------------------------===//
 // Type Serialization
 //===----------------------------------------------------------------------===//
@@ -2402,6 +2415,7 @@ void ASTWriter::WriteASTCore(Sema &SemaRef, MemorizeStatCalls *StatCalls,
   WriteIdentifierTable(PP);
 
   WriteTypeDeclOffsets();
+  WriteUserDiagnosticMappings(Context.getDiagnostics());
 
   // Write the C++ base-specifier set offsets.
   if (!CXXBaseSpecifiersOffsets.empty()) {
@@ -2635,6 +2649,9 @@ void ASTWriter::WriteASTChain(Sema &SemaRef, MemorizeStatCalls *StatCalls,
   WriteReferencedSelectorsPool(SemaRef);
   WriteIdentifierTable(PP);
   WriteTypeDeclOffsets();
+  // FIXME: For chained PCH only write the new mappings (we currently
+  // write all of them again).
+  WriteUserDiagnosticMappings(Context.getDiagnostics());
 
   /// Build a record containing first declarations from a chained PCH and the
   /// most recent declarations in this AST that they point to.