Attaching comments to redeclarations: fix wrong assumptions

The reason for the recent fallout for "attaching comments to any redeclaration"
change are two false assumptions:
(1) a RawComment is attached to a single decl (not true for 'typedef struct X *Y'
    where we want the comment to be attached to both X and Y);
(2) the whole redeclaration chain has only a single comment (obviously false, the
    user can put a separate comment for each redeclaration).

To fix (1) I revert the part of the recent change where a 'Decl*' member was
introduced to RawComment.  Now ASTContext has a separate DenseMap for mapping
'Decl*' to 'FullComment*'.

To fix (2) I just removed the test with this assumption.  We might not parse
every comment in redecl chain if we already parsed at least one.

llvm-svn: 161878

1 files changed, 5 insertions, 16 deletions

diff --git a/clang/lib/AST/RawCommentList.cpp b/clang/lib/AST/RawCommentList.cpp
index c704cabe69f..a5a32870577 100644
--- a/clang/lib/AST/RawCommentList.cpp
+++ b/clang/lib/AST/RawCommentList.cpp
@@ -65,7 +65,7 @@ bool mergedCommentIsTrailingComment(StringRef Comment) {
 RawComment::RawComment(const SourceManager &SourceMgr, SourceRange SR,
                        bool Merged) :
     Range(SR), RawTextValid(false), BriefTextValid(false),
-    IsAlmostTrailingComment(false),
+    IsAttached(false), IsAlmostTrailingComment(false),
     BeginLineValid(false), EndLineValid(false) {
   // Extract raw comment text, if possible.
   if (SR.getBegin() == SR.getEnd() || getRawText(SourceMgr).empty()) {
@@ -87,16 +87,6 @@ RawComment::RawComment(const SourceManager &SourceMgr, SourceRange SR,
   }
 }
 
-const Decl *RawComment::getDecl() const {
-  if (DeclOrParsedComment.isNull())
-    return NULL;
-
-  if (const Decl *D = DeclOrParsedComment.dyn_cast<const Decl *>())
-    return D;
-
-  return DeclOrParsedComment.get<comments::FullComment *>()->getDecl();
-}
-
 unsigned RawComment::getBeginLine(const SourceManager &SM) const {
   if (BeginLineValid)
     return BeginLine;
@@ -169,7 +159,8 @@ const char *RawComment::extractBriefText(const ASTContext &Context) const {
   return BriefTextPtr;
 }
 
-comments::FullComment *RawComment::parse(const ASTContext &Context) const {
+comments::FullComment *RawComment::parse(const ASTContext &Context,
+                                         const Decl *D) const {
   // Make sure that RawText is valid.
   getRawText(Context.getSourceManager());
 
@@ -179,13 +170,11 @@ comments::FullComment *RawComment::parse(const ASTContext &Context) const {
                     RawText.begin(), RawText.end());
   comments::Sema S(Context.getAllocator(), Context.getSourceManager(),
                    Context.getDiagnostics(), Traits);
-  S.setDecl(getDecl());
+  S.setDecl(D);
   comments::Parser P(L, S, Context.getAllocator(), Context.getSourceManager(),
                      Context.getDiagnostics(), Traits);
 
-  comments::FullComment *FC = P.parseFullComment();
-  DeclOrParsedComment = FC;
-  return FC;
+  return P.parseFullComment();
 }
 
 namespace {