remember referenced decls in our AST's

llvm-svn: 39193

clang/AST/SemaExpr.cpp

@@ -253,8 +253,7 @@ Sema::ExprResult Sema::ParseIdentifierExpr(SourceLocation Loc,
     return true;
   }
     
-    
-  return new DeclRefExpr(*(Decl*)0);
+  return new DeclRefExpr(D);
 }
 
 Sema::ExprResult Sema::ParseSimplePrimaryExpr(SourceLocation Loc,

clang/AST/StmtPrinter.cpp

@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/AST/StmtVisitor.h"
+#include "clang/AST/Decl.h"
 #include "clang/AST/Expr.h"
 #include "clang/Lex/IdentifierTable.h"
 #include "llvm/Support/Compiler.h"
@@ -211,8 +212,7 @@ void StmtPrinter::VisitExpr(Expr *Node) {
 }
 
 void StmtPrinter::VisitDeclRefExpr(DeclRefExpr *Node) {
-  // FIXME: print name.
-  OS << "x";
+  OS << Node->getDecl()->getName();
 }
 
 void StmtPrinter::VisitIntegerConstant(IntegerConstant *Node) {

clang/Sema/SemaExpr.cpp

@@ -253,8 +253,7 @@ Sema::ExprResult Sema::ParseIdentifierExpr(SourceLocation Loc,
     return true;
   }
     
-    
-  return new DeclRefExpr(*(Decl*)0);
+  return new DeclRefExpr(D);
 }
 
 Sema::ExprResult Sema::ParseSimplePrimaryExpr(SourceLocation Loc,

clang/include/clang/AST/Expr.h

@@ -42,10 +42,12 @@ public:
 /// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function,
 /// enum, etc.
 class DeclRefExpr : public Expr {
-  // TODO: Union with the decl when resolved.
-  Decl &D;
+  Decl *D;
 public:
-  DeclRefExpr(Decl &d) : D(d) {}
+  DeclRefExpr(Decl *d) : D(d) {}
+  
+  Decl *getDecl() const { return D; }
+  
   virtual void visit(StmtVisitor &Visitor);
 };