From 952c15dd52a004861edea256479ad80de3148263 Mon Sep 17 00:00:00 2001
From: Eli Friedman <eli.friedman@gmail.com>
Date: Tue, 21 Jul 2009 19:28:10 +0000
Subject: Misc fixes for -Wreorder:

1. Make it work correctly with anonymous unions.
2. Don't compute it if the warning isn't enabled.
3. Optimize the algorithm slightly to make it linear time in the
case where we don't produce any warnings.

llvm-svn: 76630
---
 clang/lib/Sema/SemaDeclCXX.cpp | 62 ++++++++++++++++++++++++++----------------
 1 file changed, 39 insertions(+), 23 deletions(-)

(limited to 'clang/lib/Sema/SemaDeclCXX.cpp')

diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp
index c62858ac730..cb62debfe95 100644
--- a/clang/lib/Sema/SemaDeclCXX.cpp
+++ b/clang/lib/Sema/SemaDeclCXX.cpp
@@ -774,6 +774,29 @@ Sema::ActOnMemInitializer(DeclPtrTy ConstructorD,
                                         IdLoc);
 }
 
+static void *GetKeyForTopLevelField(FieldDecl *Field) {
+  // For anonymous unions, use the class declaration as the key.
+  if (const RecordType *RT = Field->getType()->getAsRecordType()) {
+    if (RT->getDecl()->isAnonymousStructOrUnion())
+      return static_cast<void *>(RT->getDecl());
+  }
+  return static_cast<void *>(Field);
+}
+
+static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member) {
+  // For fields injected into the class via declaration of an anonymous union,
+  // use its anonymous union class declaration as the unique key.
+  if (FieldDecl *Field = Member->getMember()) {
+    if (Field->getDeclContext()->isRecord()) {
+      RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext());
+      if (RD->isAnonymousStructOrUnion())
+        return static_cast<void *>(RD);
+    }
+    return static_cast<void *>(Field);
+  }
+  return static_cast<RecordType *>(Member->getBaseClass());
+}
+
 void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 
                                 SourceLocation ColonLoc,
                                 MemInitTy **MemInits, unsigned NumMemInits) {
@@ -792,13 +815,7 @@ void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl,
   for (unsigned i = 0; i < NumMemInits; i++) {
     CXXBaseOrMemberInitializer *Member = 
       static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]);
-    void *KeyToMember = Member->getBaseOrMember();
-    // For fields injected into the class via declaration of an anonymous union,
-    // use its anonymous union class declaration as the unique key.
-    if (FieldDecl *Field = Member->getMember())
-      if (Field->getDeclContext()->isRecord() &&
-          cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion())
-        KeyToMember = static_cast<void *>(Field->getDeclContext());
+    void *KeyToMember = GetKeyForMember(Member);
     CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember];
     if (!PrevMember) {
       PrevMember = Member;
@@ -823,6 +840,11 @@ void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl,
     Constructor->setBaseOrMemberInitializers(Context, 
                     reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 
                     NumMemInits);
+  }
+  if (!err && (Diags.getDiagnosticLevel(diag::warn_base_initialized)
+               != Diagnostic::Ignored ||
+               Diags.getDiagnosticLevel(diag::warn_field_initialized)
+               != Diagnostic::Ignored)) {
     // Also issue warning if order of ctor-initializer list does not match order
     // of 1) base class declarations and 2) order of non-static data members.
     llvm::SmallVector<const void*, 32> AllBaseOrMembers;
@@ -846,7 +868,7 @@ void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl,
     
     for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(),
          E = ClassDecl->field_end(); Field != E; ++Field)
-      AllBaseOrMembers.push_back(*Field);
+      AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field));
     
     int Last = AllBaseOrMembers.size();
     int curIndex = 0;
@@ -854,19 +876,13 @@ void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl,
     for (unsigned i = 0; i < NumMemInits; i++) {
       CXXBaseOrMemberInitializer *Member = 
         static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]);
-      void *MemberInCtorList;
-      if (Member->isBaseInitializer())
-        MemberInCtorList = Member->getBaseClass();
-      else
-        MemberInCtorList = Member->getMember();
-      
-      int j;
-      for (j = curIndex; j < Last; j++)
-        if (MemberInCtorList == AllBaseOrMembers[j])
+      void *MemberInCtorList = GetKeyForMember(Member);
+
+      for (; curIndex < Last; curIndex++)
+        if (MemberInCtorList == AllBaseOrMembers[curIndex])
           break;
-      if (j == Last) {
-        if (!PrevMember)
-          continue;
+      if (curIndex == Last) {
+        assert(PrevMember && "Member not in member list?!");
         // Initializer as specified in ctor-initializer list is out of order.
         // Issue a warning diagnostic.
         if (PrevMember->isBaseInitializer()) {
@@ -893,11 +909,11 @@ void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl,
                diag::note_fieldorbase_initialized_here) << 1
             << BaseClass->getDesugaredType(true);
         }
+        for (curIndex = 0; curIndex < Last; curIndex++)
+          if (MemberInCtorList == AllBaseOrMembers[curIndex]) 
+            break;
       }
       PrevMember = Member;
-      for (curIndex=0; curIndex < Last; curIndex++)
-        if (MemberInCtorList == AllBaseOrMembers[curIndex]) 
-          break;
     }
   }
 }
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