From 14d56ef43ff4921c6749f7340212fbb743fdbb9b Mon Sep 17 00:00:00 2001
From: Fariborz Jahanian <fjahanian@apple.com>
Date: Wed, 27 Apr 2011 17:14:21 +0000
Subject: [PATCH] Some refactoring of my ms_struct patch. // rdar://8823265
 related.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@130311 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/clang/AST/ASTContext.h        | 5 +++++
 lib/AST/ASTContext.cpp                | 7 +++++++
 lib/AST/RecordLayoutBuilder.cpp       | 4 +---
 lib/CodeGen/CGRecordLayoutBuilder.cpp | 9 ++-------
 4 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/include/clang/AST/ASTContext.h b/include/clang/AST/ASTContext.h
index 959e158ceb..9c3cfe73b2 100644
--- a/include/clang/AST/ASTContext.h
+++ b/include/clang/AST/ASTContext.h
@@ -394,6 +394,11 @@ public:
   FieldDecl *getInstantiatedFromUnnamedFieldDecl(FieldDecl *Field);
 
   void setInstantiatedFromUnnamedFieldDecl(FieldDecl *Inst, FieldDecl *Tmpl);
+  
+  /// ZeroBitfieldFollowsNonBitfield - return 'true" if 'FD' is a zero-length
+  /// bitfield which follows the non-bitfield 'LastFD'.
+  bool ZeroBitfieldFollowsNonBitfield(const FieldDecl *FD, 
+                                      const FieldDecl *LastFD) const;
 
   // Access to the set of methods overridden by the given C++ method.
   typedef CXXMethodVector::iterator overridden_cxx_method_iterator;
diff --git a/lib/AST/ASTContext.cpp b/lib/AST/ASTContext.cpp
index e49bde3487..c571c559bc 100644
--- a/lib/AST/ASTContext.cpp
+++ b/lib/AST/ASTContext.cpp
@@ -536,6 +536,13 @@ void ASTContext::setInstantiatedFromUnnamedFieldDecl(FieldDecl *Inst,
   InstantiatedFromUnnamedFieldDecl[Inst] = Tmpl;
 }
 
+bool ASTContext::ZeroBitfieldFollowsNonBitfield(const FieldDecl *FD, 
+                                    const FieldDecl *LastFD) const {
+  return (FD->isBitField() && LastFD && !LastFD->isBitField() &&
+          FD->getBitWidth()-> EvaluateAsInt(*this).getZExtValue() == 0);
+  
+}
+
 ASTContext::overridden_cxx_method_iterator
 ASTContext::overridden_methods_begin(const CXXMethodDecl *Method) const {
   llvm::DenseMap<const CXXMethodDecl *, CXXMethodVector>::const_iterator Pos
diff --git a/lib/AST/RecordLayoutBuilder.cpp b/lib/AST/RecordLayoutBuilder.cpp
index c4a156fbcc..407655770d 100644
--- a/lib/AST/RecordLayoutBuilder.cpp
+++ b/lib/AST/RecordLayoutBuilder.cpp
@@ -1261,10 +1261,8 @@ void RecordLayoutBuilder::LayoutFields(const RecordDecl *D) {
       // Zero-length bitfields following non-bitfield members are
       // ignored:
       const FieldDecl *FD =  (*Field);
-      if (FD->isBitField() && LastFD && !LastFD->isBitField() &&
-          FD->getBitWidth()->EvaluateAsInt(Context).getZExtValue() == 0) {
+      if (Context.ZeroBitfieldFollowsNonBitfield(FD, LastFD))
         continue;
-      }
       LastFD = FD;
     }
     LayoutField(*Field);
diff --git a/lib/CodeGen/CGRecordLayoutBuilder.cpp b/lib/CodeGen/CGRecordLayoutBuilder.cpp
index d202b6e825..3d9fd88613 100644
--- a/lib/CodeGen/CGRecordLayoutBuilder.cpp
+++ b/lib/CodeGen/CGRecordLayoutBuilder.cpp
@@ -753,10 +753,7 @@ bool CGRecordLayoutBuilder::LayoutFields(const RecordDecl *D) {
       // Zero-length bitfields following non-bitfield members are
       // ignored:
       const FieldDecl *FD =  (*Field);
-      // FIXME. Refactor into common code as it is used in several places.
-      if (FD->isBitField() && LastFD && !LastFD->isBitField() &&
-          FD->getBitWidth()->
-            EvaluateAsInt(Types.getContext()).getZExtValue() == 0) {
+      if (Types.getContext().ZeroBitfieldFollowsNonBitfield(FD, LastFD)) {
         --FieldNo;
         continue;
       }
@@ -999,9 +996,7 @@ CGRecordLayout *CodeGenTypes::ComputeRecordLayout(const RecordDecl *D) {
     if (IsMsStruct) {
       // Zero-length bitfields following non-bitfield members are
       // ignored:
-      if (FD->isBitField() && LastFD && !LastFD->isBitField() &&
-          FD->getBitWidth()->
-          EvaluateAsInt(getContext()).getZExtValue() == 0) {
+      if (getContext().ZeroBitfieldFollowsNonBitfield(FD, LastFD)) {
         --i;
         continue;
       }
-- 
2.50.1