From 23b88b73e1982404b75a5175dccab22eb6a3a29a Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sat, 28 Mar 2009 06:26:18 +0000
Subject: [PATCH] Cleanups for DeclGroup.

llvm-svn: 67922
---
 clang/include/clang/AST/DeclGroup.h | 44 ++++++++++++++++++++---------
 clang/include/clang/AST/Stmt.h      | 19 ++++---------
 clang/lib/AST/DeclGroup.cpp         | 13 ++++-----
 3 files changed, 41 insertions(+), 35 deletions(-)

diff --git a/clang/include/clang/AST/DeclGroup.h b/clang/include/clang/AST/DeclGroup.h
index 2b93f3c2cb3d..9b5aa1c58db0 100644
--- a/clang/include/clang/AST/DeclGroup.h
+++ b/clang/include/clang/AST/DeclGroup.h
@@ -58,7 +58,7 @@ public:
     
 class DeclGroupRef {
 protected:
-  enum Kind { DeclKind=0x0, DeclGroupKind=0x1, Mask=0x1 };  
+  enum Kind { SingleDeclKind=0x0, DeclGroupKind=0x1, Mask=0x1 };  
   Decl* D;
 
   Kind getKind() const {
@@ -75,31 +75,49 @@ public:
   typedef Decl** iterator;
   typedef Decl* const * const_iterator;
   
-  bool hasSolitaryDecl() const {
-    return getKind() == DeclKind;
+  bool isSingleDecl() const { return getKind() == SingleDeclKind; }
+  bool isDeclGroup() const { return getKind() == DeclGroupKind; }
+
+  Decl *getSingleDecl() {
+    assert(isSingleDecl() && "Isn't a declgroup");
+    return D;
   }
+  const Decl *getSingleDecl() const {
+    return const_cast<DeclGroupRef*>(this)->getSingleDecl();
+  }
+  
+  DeclGroup &getDeclGroup() {
+    assert(isDeclGroup() && "Isn't a declgroup");
+    return *((DeclGroup*)(reinterpret_cast<uintptr_t>(D) & ~Mask));
+  }
+  const DeclGroup &getDeclGroup() const {
+    return const_cast<DeclGroupRef*>(this)->getDeclGroup();
+  }
+  
 
   iterator begin() {
-    if (getKind() == DeclKind) return D ? &D : 0;
-    DeclGroup& G = *((DeclGroup*) (reinterpret_cast<uintptr_t>(D) & ~Mask));
-    return &G[0];
+    if (isSingleDecl())
+      return D ? &D : 0;
+    return &getDeclGroup()[0];
   }
 
   iterator end() {
-    if (getKind() == DeclKind) return D ? &D + 1 : 0;
-    DeclGroup& G = *((DeclGroup*) (reinterpret_cast<uintptr_t>(D) & ~Mask));
+    if (isSingleDecl())
+      return D ? &D+1 : 0;
+    DeclGroup &G = getDeclGroup();
     return &G[0] + G.size();
   }
   
   const_iterator begin() const {
-    if (getKind() == DeclKind) return D ? &D : 0;
-    DeclGroup& G = *((DeclGroup*) (reinterpret_cast<uintptr_t>(D) & ~Mask));
-    return &G[0];
+    if (isSingleDecl())
+      return D ? &D : 0;
+    return &getDeclGroup()[0];
   }
   
   const_iterator end() const {
-    if (getKind() == DeclKind) return D ? &D + 1 : 0;
-    DeclGroup& G = *((DeclGroup*) (reinterpret_cast<uintptr_t>(D) & ~Mask));
+    if (isSingleDecl())
+      return D ? &D+1 : 0;
+    const DeclGroup &G = getDeclGroup();
     return &G[0] + G.size();
   }
 
diff --git a/clang/include/clang/AST/Stmt.h b/clang/include/clang/AST/Stmt.h
index e5fa30999259..5d1c6dc2077c 100644
--- a/clang/include/clang/AST/Stmt.h
+++ b/clang/include/clang/AST/Stmt.h
@@ -235,23 +235,14 @@ public:
   
   virtual void Destroy(ASTContext& Ctx);
 
-  // hasSolitaryDecl - This method returns true if this DeclStmt refers
-  // to a single Decl.
+  /// hasSolitaryDecl - This method returns true if this DeclStmt refers
+  /// to a single Decl.
   bool hasSolitaryDecl() const {
-    return DG.hasSolitaryDecl();
+    return DG.isSingleDecl();
   }
  
-  const Decl* getSolitaryDecl() const {
-    assert (hasSolitaryDecl() &&
-            "Caller assumes this DeclStmt points to one Decl*");
-    return *DG.begin();
-  }
-  
-  Decl* getSolitaryDecl() {
-    assert (hasSolitaryDecl() &&
-            "Caller assumes this DeclStmt points to one Decl*");
-    return *DG.begin();
-  }  
+  const Decl* getSolitaryDecl() const { return DG.getSingleDecl(); }
+  Decl *getSolitaryDecl() { return DG.getSingleDecl(); }  
 
   SourceLocation getStartLoc() const { return StartLoc; }
   SourceLocation getEndLoc() const { return EndLoc; }
diff --git a/clang/lib/AST/DeclGroup.cpp b/clang/lib/AST/DeclGroup.cpp
index 35cb6d3bc614..36a7c2b400e3 100644
--- a/clang/lib/AST/DeclGroup.cpp
+++ b/clang/lib/AST/DeclGroup.cpp
@@ -17,7 +17,6 @@
 #include "llvm/Support/Allocator.h"
 #include "llvm/Bitcode/Serialize.h"
 #include "llvm/Bitcode/Deserialize.h"
-
 using namespace clang;
 
 DeclGroup* DeclGroup::Create(ASTContext& C, unsigned numdecls, Decl** decls) {
@@ -48,8 +47,8 @@ DeclGroup* DeclGroup::Read(llvm::Deserializer& D, ASTContext& C) {
 }
   
 DeclGroup::DeclGroup(unsigned numdecls, Decl** decls) : NumDecls(numdecls) {
-  assert (numdecls > 0);
-  assert (decls);
+  assert(numdecls > 0);
+  assert(decls);
   memcpy(this+1, decls, numdecls * sizeof(*decls));
 }
 
@@ -59,14 +58,12 @@ void DeclGroup::Destroy(ASTContext& C) {
 }
 
 void DeclGroupRef::Emit(llvm::Serializer& S) const {
-  if (getKind() == DeclKind) {
+  if (isSingleDecl()) {
     S.EmitBool(false);
     S.EmitPtr(D);
-  }
-  else {
+  } else {
     S.EmitBool(true);
-    S.EmitPtr(reinterpret_cast<DeclGroup*>(reinterpret_cast<uintptr_t>(D) 
-                                           & ~Mask));        
+    S.EmitPtr(&getDeclGroup());        
   }
 }