}
+// getAlwaysOpaqueTy - This function returns an opaque type. It doesn't matter
+// _which_ opaque type it is, but the opaque type must never get resolved.
+//
+static Type *getAlwaysOpaqueTy() {
+ static Type *AlwaysOpaqueTy = OpaqueType::get();
+ static PATypeHolder Holder(AlwaysOpaqueTy);
+ return AlwaysOpaqueTy;
+}
+
+
+//===----------------------------------------------------------------------===//
+// dropAllTypeUses methods - These methods eliminate any possibly recursive type
+// references from a derived type. The type must remain abstract, so we make
+// sure to use an always opaque type as an argument.
+//
+
+void FunctionType::dropAllTypeUses() {
+ ResultType = getAlwaysOpaqueTy();
+ ParamTys.clear();
+}
+
+void ArrayType::dropAllTypeUses() {
+ ElementType = getAlwaysOpaqueTy();
+}
+
+void StructType::dropAllTypeUses() {
+ ETypes.clear();
+ ETypes.push_back(PATypeHandle(getAlwaysOpaqueTy(), this));
+}
+
+void PointerType::dropAllTypeUses() {
+ ElementType = getAlwaysOpaqueTy();
+}
+
+
+
+
// isTypeAbstract - This is a recursive function that walks a type hierarchy
// calculating whether or not a type is abstract. Worst case it will have to do
// a lot of traversing if you have some whacko opaque types, but in most cases,
return MT;
}
-void FunctionType::dropAllTypeUses() {
- ResultType = OpaqueType::get();
- ParamTys.clear();
-}
-
-
//===----------------------------------------------------------------------===//
// Array Type Factory...
//
return AT;
}
-void ArrayType::dropAllTypeUses() {
- ElementType = OpaqueType::get();
-}
-
-
-
-
//===----------------------------------------------------------------------===//
// Struct Type Factory...
//
return ST;
}
-void StructType::dropAllTypeUses() {
- ETypes.clear();
- ETypes.push_back(PATypeHandle(OpaqueType::get(), this));
-}
-
//===----------------------------------------------------------------------===//
return PT;
}
-void PointerType::dropAllTypeUses() {
- ElementType = OpaqueType::get();
-}
-
void debug_type_tables() {
FunctionTypes.dump();
ArrayTypes.dump();