src/hotspot/share/opto/library_call.cpp

rev 58565 : 8238358: Implementation of JEP 371: Hidden Classes
Reviewed-by: duke
Contributed-by: mandy.chung@oracle.com, lois.foltan@oracle.com, david.holmes@oracle.com, harold.seigel@oracle.com, serguei.spitsyn@oracle.com, alex.buckley@oracle.com, jamsheed.c.m@oracle.com

*** 184,193 ****
--- 184,194 ----
    }
    Node* generate_access_flags_guard(Node* kls,
                                      int modifier_mask, int modifier_bits,
                                      RegionNode* region);
    Node* generate_interface_guard(Node* kls, RegionNode* region);
+   Node* generate_hidden_class_guard(Node* kls, RegionNode* region);
    Node* generate_array_guard(Node* kls, RegionNode* region) {
      return generate_array_guard_common(kls, region, false, false);
    }
    Node* generate_non_array_guard(Node* kls, RegionNode* region) {
      return generate_array_guard_common(kls, region, false, true);
*** 781,790 ****
--- 782,792 ----
    case vmIntrinsics::_isInstance:
    case vmIntrinsics::_getModifiers:
    case vmIntrinsics::_isInterface:
    case vmIntrinsics::_isArray:
    case vmIntrinsics::_isPrimitive:
+   case vmIntrinsics::_isHiddenClass:
    case vmIntrinsics::_getSuperclass:
    case vmIntrinsics::_getClassAccessFlags:      return inline_native_Class_query(intrinsic_id());
  
    case vmIntrinsics::_floatToRawIntBits:
    case vmIntrinsics::_floatToIntBits:
*** 3082,3091 ****
--- 3084,3096 ----
    return generate_fair_guard(bol, region);
  }
  Node* LibraryCallKit::generate_interface_guard(Node* kls, RegionNode* region) {
    return generate_access_flags_guard(kls, JVM_ACC_INTERFACE, 0, region);
  }
+ Node* LibraryCallKit::generate_hidden_class_guard(Node* kls, RegionNode* region) {
+   return generate_access_flags_guard(kls, JVM_ACC_IS_HIDDEN_CLASS, 0, region);
+ }
  
  //-------------------------inline_native_Class_query-------------------
  bool LibraryCallKit::inline_native_Class_query(vmIntrinsics::ID id) {
    const Type* return_type = TypeInt::BOOL;
    Node* prim_return_value = top();  // what happens if it's a primitive class?
*** 3117,3126 ****
--- 3122,3134 ----
      break;
    case vmIntrinsics::_isPrimitive:
      prim_return_value = intcon(1);
      expect_prim = true;  // obviously
      break;
+   case vmIntrinsics::_isHiddenClass:
+     prim_return_value = intcon(0);
+     break;
    case vmIntrinsics::_getSuperclass:
      prim_return_value = null();
      return_type = TypeInstPtr::MIRROR->cast_to_ptr_type(TypePtr::BotPTR);
      break;
    case vmIntrinsics::_getClassAccessFlags:
*** 3209,3218 ****
--- 3217,3236 ----
  
    case vmIntrinsics::_isPrimitive:
      query_value = intcon(0); // "normal" path produces false
      break;
  
+   case vmIntrinsics::_isHiddenClass:
+     // (To verify this code sequence, check the asserts in JVM_IsHiddenClass.)
+     if (generate_hidden_class_guard(kls, region) != NULL)
+       // A guard was added.  If the guard is taken, it was an hidden class.
+       phi->add_req(intcon(1));
+     // If we fall through, it's a plain class.
+     query_value = intcon(0);
+     break;
+ 
+ 
    case vmIntrinsics::_getSuperclass:
      // The rules here are somewhat unfortunate, but we can still do better
      // with random logic than with a JNI call.
      // Interfaces store null or Object as _super, but must report null.
      // Arrays store an intermediate super as _super, but must report Object.