Add a bit more handling for declarations like "int a[*]".

llvm-svn: 70162

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -891,6 +891,8 @@ def err_illegal_decl_array_incomplete_type : Error<
   "array has incomplete element type %0">;
 def err_illegal_decl_array_of_references : Error<
   "'%0' declared as array of references">;
+def err_array_star_outside_prototype : Error<
+  "star modifier used outside of function prototype">;
 def err_illegal_decl_pointer_to_reference : Error<
   "'%0' declared as a pointer to a reference">;
 def err_illegal_decl_mempointer_to_void : Error<

clang/lib/AST/Type.cpp

@@ -37,7 +37,8 @@ void Type::Destroy(ASTContext& C) {
 }
 
 void VariableArrayType::Destroy(ASTContext& C) {
-  SizeExpr->Destroy(C);
+  if (SizeExpr)
+    SizeExpr->Destroy(C);
   this->~VariableArrayType();
   C.Deallocate(this);
 }

clang/lib/Sema/SemaType.cpp

@@ -500,7 +500,10 @@ QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
   }
   llvm::APSInt ConstVal(32);
   if (!ArraySize) {
-    T = Context.getIncompleteArrayType(T, ASM, Quals);
+    if (ASM == ArrayType::Star)
+      T = Context.getVariableArrayType(T, 0, ASM, Quals);
+    else
+      T = Context.getIncompleteArrayType(T, ASM, Quals);
   } else if (ArraySize->isValueDependent()) {
     T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals);
   } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) ||
@@ -687,6 +690,15 @@ QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S, unsigned Skip) {
         ASM = ArrayType::Static;
       else
         ASM = ArrayType::Normal;
+      if (ASM == ArrayType::Star &&
+          D.getContext() != Declarator::PrototypeContext) {
+        // FIXME: This check isn't quite right: it allows star in prototypes
+        // for function definitions, and disallows some edge cases detailed
+        // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html
+        Diag(DeclType.Loc, diag::err_array_star_outside_prototype);
+        ASM = ArrayType::Normal;
+        D.setInvalidType(true);
+      }
       T = BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, DeclType.Loc, Name);
       break;
     }

clang/test/Sema/vla.c

@@ -43,3 +43,6 @@ void f3()
 
 // PR3663
 static const unsigned array[((2 * (int)((((4) / 2) + 1.0/3.0) * (4) - 1e-8)) + 1)]; // expected-warning {{size of static array must be an integer constant expression}}
+
+int a[*]; // expected-error {{star modifier used outside of function prototype}}
+int f4(int a[*][*]);