8349860: Make Class.isArray(), Class.isInterface() and Class.isPrimitive() non-native

Reviewed-by: dlong, rriggs, vlivanov, yzheng, liach

Author: coleenp

src/hotspot/share/c1/c1_Canonicalizer.cpp

@@ -536,17 +536,6 @@ void Canonicalizer::do_Intrinsic      (Intrinsic*       x) {
     }
     break;
   }
-  case vmIntrinsics::_isPrimitive        : {
-    assert(x->number_of_arguments() == 1, "wrong type");
-
-    // Class.isPrimitive is known on constant classes:
-    InstanceConstant* c = x->argument_at(0)->type()->as_InstanceConstant();
-    if (c != nullptr && !c->value()->is_null_object()) {
-      ciType* t = c->value()->java_mirror_type();
-      set_constant(t->is_primitive_type());
-    }
-    break;
-  }
   default:
     break;
   }

src/hotspot/share/c1/c1_Compiler.cpp

@@ -155,7 +155,6 @@ bool Compiler::is_intrinsic_supported(vmIntrinsics::ID id) {
   case vmIntrinsics::_longBitsToDouble:
   case vmIntrinsics::_getClass:
   case vmIntrinsics::_isInstance:
-  case vmIntrinsics::_isPrimitive:
   case vmIntrinsics::_currentCarrierThread:
   case vmIntrinsics::_currentThread:
   case vmIntrinsics::_scopedValueCache:

src/hotspot/share/c1/c1_LIRGenerator.cpp

@@ -1278,25 +1278,6 @@ void LIRGenerator::do_getClass(Intrinsic* x) {
               LIR_OprFact::address(new LIR_Address(temp, T_OBJECT)), result);
 }
 
-// java.lang.Class::isPrimitive()
-void LIRGenerator::do_isPrimitive(Intrinsic* x) {
-  assert(x->number_of_arguments() == 1, "wrong type");
-
-  LIRItem rcvr(x->argument_at(0), this);
-  rcvr.load_item();
-  LIR_Opr temp = new_register(T_METADATA);
-  LIR_Opr result = rlock_result(x);
-
-  CodeEmitInfo* info = nullptr;
-  if (x->needs_null_check()) {
-    info = state_for(x);
-  }
-
-  __ move(new LIR_Address(rcvr.result(), java_lang_Class::klass_offset(), T_ADDRESS), temp, info);
-  __ cmp(lir_cond_notEqual, temp, LIR_OprFact::metadataConst(nullptr));
-  __ cmove(lir_cond_notEqual, LIR_OprFact::intConst(0), LIR_OprFact::intConst(1), result, T_BOOLEAN);
-}
-
 void LIRGenerator::do_getObjectSize(Intrinsic* x) {
   assert(x->number_of_arguments() == 3, "wrong type");
   LIR_Opr result_reg = rlock_result(x);
@@ -2914,7 +2895,6 @@ void LIRGenerator::do_Intrinsic(Intrinsic* x) {
 
   case vmIntrinsics::_Object_init:    do_RegisterFinalizer(x); break;
   case vmIntrinsics::_isInstance:     do_isInstance(x);    break;
-  case vmIntrinsics::_isPrimitive:    do_isPrimitive(x);   break;
   case vmIntrinsics::_getClass:       do_getClass(x);      break;
   case vmIntrinsics::_getObjectSize:  do_getObjectSize(x); break;
   case vmIntrinsics::_currentCarrierThread: do_currentCarrierThread(x); break;

src/hotspot/share/c1/c1_LIRGenerator.hpp

@@ -254,7 +254,6 @@ class LIRGenerator: public InstructionVisitor, public BlockClosure {
 
   void do_RegisterFinalizer(Intrinsic* x);
   void do_isInstance(Intrinsic* x);
-  void do_isPrimitive(Intrinsic* x);
   void do_getClass(Intrinsic* x);
   void do_getObjectSize(Intrinsic* x);
   void do_currentCarrierThread(Intrinsic* x);

src/hotspot/share/classfile/javaClasses.cpp

@@ -868,6 +868,7 @@ int java_lang_Class::_classData_offset;
 int java_lang_Class::_classRedefinedCount_offset;
 int java_lang_Class::_reflectionData_offset;
 int java_lang_Class::_modifiers_offset;
+int java_lang_Class::_is_primitive_offset;
 
 bool java_lang_Class::_offsets_computed = false;
 GrowableArray<Klass*>* java_lang_Class::_fixup_mirror_list = nullptr;
@@ -1062,7 +1063,7 @@ void java_lang_Class::allocate_mirror(Klass* k, bool is_scratch, Handle protecti
   set_klass(mirror(), k);
 
   // Set the modifiers flag.
-  int computed_modifiers = k->compute_modifier_flags();
+  u2 computed_modifiers = k->compute_modifier_flags();
   set_modifiers(mirror(), computed_modifiers);
 
   InstanceMirrorKlass* mk = InstanceMirrorKlass::cast(mirror->klass());
@@ -1272,8 +1273,11 @@ void java_lang_Class::set_protection_domain(oop java_class, oop pd) {
 
 void java_lang_Class::set_component_mirror(oop java_class, oop comp_mirror) {
   assert(_component_mirror_offset != 0, "must be set");
-    java_class->obj_field_put(_component_mirror_offset, comp_mirror);
-  }
+  assert(java_lang_Class::as_Klass(java_class) != nullptr &&
+         java_lang_Class::as_Klass(java_class)->is_array_klass(), "must be");
+  java_class->obj_field_put(_component_mirror_offset, comp_mirror);
+}
+
 oop java_lang_Class::component_mirror(oop java_class) {
   assert(_component_mirror_offset != 0, "must be set");
   return java_class->obj_field(_component_mirror_offset);
@@ -1347,9 +1351,14 @@ void java_lang_Class::set_source_file(oop java_class, oop source_file) {
   java_class->obj_field_put(_source_file_offset, source_file);
 }
 
+void java_lang_Class::set_is_primitive(oop java_class) {
+  assert(_is_primitive_offset != 0, "must be set");
+  java_class->bool_field_put(_is_primitive_offset, true);
+}
+
+
 oop java_lang_Class::create_basic_type_mirror(const char* basic_type_name, BasicType type, TRAPS) {
-  // This should be improved by adding a field at the Java level or by
-  // introducing a new VM klass (see comment in ClassFileParser)
+  // Mirrors for basic types have a null klass field, which makes them special.
   oop java_class = InstanceMirrorKlass::cast(vmClasses::Class_klass())->allocate_instance(nullptr, CHECK_NULL);
   if (type != T_VOID) {
     Klass* aklass = Universe::typeArrayKlass(type);
@@ -1361,6 +1370,7 @@ oop java_lang_Class::create_basic_type_mirror(const char* basic_type_name, Basic
   assert(static_oop_field_count(java_class) == 0, "should have been zeroed by allocation");
 #endif
   set_modifiers(java_class, JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC);
+  set_is_primitive(java_class);
   return java_class;
 }
 
@@ -1500,8 +1510,9 @@ oop java_lang_Class::primitive_mirror(BasicType t) {
   macro(_classData_offset,           k, "classData",           object_signature,       false); \
   macro(_reflectionData_offset,      k, "reflectionData",      java_lang_ref_SoftReference_signature, false); \
   macro(_signers_offset,             k, "signers",             object_array_signature, false); \
-  macro(_modifiers_offset,           k, vmSymbols::modifiers_name(), int_signature,    false); \
-  macro(_protection_domain_offset,   k, "protectionDomain",    java_security_ProtectionDomain_signature,  false);
+  macro(_modifiers_offset,           k, vmSymbols::modifiers_name(), char_signature,    false); \
+  macro(_protection_domain_offset,   k, "protectionDomain",    java_security_ProtectionDomain_signature,  false); \
+  macro(_is_primitive_offset,        k, "primitive",           bool_signature,         false);
 
 void java_lang_Class::compute_offsets() {
   if (_offsets_computed) {
@@ -1537,12 +1548,12 @@ void java_lang_Class::set_classRedefinedCount(oop the_class_mirror, int value) {
 
 int java_lang_Class::modifiers(oop the_class_mirror) {
   assert(_modifiers_offset != 0, "offsets should have been initialized");
-  return the_class_mirror->int_field(_modifiers_offset);
+  return the_class_mirror->char_field(_modifiers_offset);
 }
 
-void java_lang_Class::set_modifiers(oop the_class_mirror, int value) {
+void java_lang_Class::set_modifiers(oop the_class_mirror, u2 value) {
   assert(_modifiers_offset != 0, "offsets should have been initialized");
-  the_class_mirror->int_field_put(_modifiers_offset, value);
+  the_class_mirror->char_field_put(_modifiers_offset, value);
 }
 
 

src/hotspot/share/classfile/javaClasses.hpp

@@ -257,6 +257,7 @@ class java_lang_Class : AllStatic {
   static int _classRedefinedCount_offset;
   static int _reflectionData_offset;
   static int _modifiers_offset;
+  static int _is_primitive_offset;
 
   static bool _offsets_computed;
 
@@ -302,6 +303,7 @@ class java_lang_Class : AllStatic {
   static bool is_instance(oop obj);
 
   static bool is_primitive(oop java_class);
+  static void set_is_primitive(oop java_class);
   static BasicType primitive_type(oop java_class);
   static oop primitive_mirror(BasicType t);
   // JVM_NewArray support
@@ -338,7 +340,7 @@ class java_lang_Class : AllStatic {
   static void set_source_file(oop java_class, oop source_file);
 
   static int modifiers(oop java_class);
-  static void set_modifiers(oop java_class, int value);
+  static void set_modifiers(oop java_class, u2 value);
 
   static size_t oop_size(oop java_class);
   static void set_oop_size(HeapWord* java_class, size_t size);

src/hotspot/share/classfile/javaClasses.inline.hpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -293,11 +293,13 @@ inline Klass* java_lang_Class::as_Klass(oop java_class) {
 
 inline bool java_lang_Class::is_primitive(oop java_class) {
   // should assert:
-  //assert(java_lang_Class::is_instance(java_class), "must be a Class object");
+  // assert(java_lang_Class::is_instance(java_class), "must be a Class object");
   bool is_primitive = (java_class->metadata_field(_klass_offset) == nullptr);
 
 #ifdef ASSERT
-  if (is_primitive) {
+  // The heapwalker walks through Classes that have had their Klass pointers removed, so can't assert this.
+  // assert(is_primitive == java_class->bool_field(_is_primitive_offset), "must match what we told Java");
+  if (java_class->bool_field(_is_primitive_offset)) {
     Klass* k = ((Klass*)java_class->metadata_field(_array_klass_offset));
     assert(k == nullptr || is_java_primitive(ArrayKlass::cast(k)->element_type()),
         "Should be either the T_VOID primitive or a java primitive");

src/hotspot/share/classfile/vmIntrinsics.cpp

@@ -256,9 +256,6 @@ bool vmIntrinsics::disabled_by_jvm_flags(vmIntrinsics::ID id) {
   switch (id) {
   case vmIntrinsics::_isInstance:
   case vmIntrinsics::_isAssignableFrom:
-  case vmIntrinsics::_isInterface:
-  case vmIntrinsics::_isArray:
-  case vmIntrinsics::_isPrimitive:
   case vmIntrinsics::_isHidden:
   case vmIntrinsics::_getSuperclass:
   case vmIntrinsics::_Class_cast:

src/hotspot/share/classfile/vmIntrinsics.hpp

@@ -304,12 +304,6 @@ class methodHandle;
    do_name(     isAssignableFrom_name,                           "isAssignableFrom")                                    \
   do_intrinsic(_isInstance,               java_lang_Class,        isInstance_name, object_boolean_signature,     F_RN)  \
    do_name(     isInstance_name,                                 "isInstance")                                          \
-  do_intrinsic(_isInterface,              java_lang_Class,        isInterface_name, void_boolean_signature,      F_RN)  \
-   do_name(     isInterface_name,                                "isInterface")                                         \
-  do_intrinsic(_isArray,                  java_lang_Class,        isArray_name, void_boolean_signature,          F_RN)  \
-   do_name(     isArray_name,                                    "isArray")                                             \
-  do_intrinsic(_isPrimitive,              java_lang_Class,        isPrimitive_name, void_boolean_signature,      F_RN)  \
-   do_name(     isPrimitive_name,                                "isPrimitive")                                         \
   do_intrinsic(_isHidden,                 java_lang_Class,        isHidden_name, void_boolean_signature,         F_RN)  \
    do_name(     isHidden_name,                                   "isHidden")                                            \
   do_intrinsic(_getSuperclass,            java_lang_Class,        getSuperclass_name, void_class_signature,      F_RN)  \

src/hotspot/share/include/jvm.h

@@ -546,21 +546,9 @@ JVM_GetClassInterfaces(JNIEnv *env, jclass cls);
 JNIEXPORT jboolean JNICALL
 JVM_IsInterface(JNIEnv *env, jclass cls);
 
-JNIEXPORT jobject JNICALL
-JVM_GetProtectionDomain(JNIEnv *env, jclass cls);
-
-JNIEXPORT jboolean JNICALL
-JVM_IsArrayClass(JNIEnv *env, jclass cls);
-
-JNIEXPORT jboolean JNICALL
-JVM_IsPrimitiveClass(JNIEnv *env, jclass cls);
-
 JNIEXPORT jboolean JNICALL
 JVM_IsHiddenClass(JNIEnv *env, jclass cls);
 
-JNIEXPORT jint JNICALL
-JVM_GetClassModifiers(JNIEnv *env, jclass cls);
-
 JNIEXPORT jobjectArray JNICALL
 JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass);