8320522: Remove code related to RegisterFinalizersAtInit

Reviewed-by: coleenp, ayang, kbarrett

src/hotspot/cpu/aarch64/templateTable_aarch64.cpp

@@ -3611,7 +3611,7 @@ void TemplateTable::_new() {
   __ ldrw(r3,
           Address(r4,
                   Klass::layout_helper_offset()));
-  // test to see if it has a finalizer or is malformed in some way
+  // test to see if it is malformed in some way
   __ tbnz(r3, exact_log2(Klass::_lh_instance_slow_path_bit), slow_case);
 
   // Allocate the instance:

src/hotspot/cpu/arm/templateTable_arm.cpp

@@ -3971,7 +3971,7 @@ void TemplateTable::_new() {
   __ b(slow_case, ne);
   __ load_resolved_klass_at_offset(Rcpool, Rindex, Rklass);
 
-  // make sure klass is initialized & doesn't have finalizer
+  // make sure klass is initialized
   // make sure klass is fully initialized
   __ ldrb(Rtemp, Address(Rklass, InstanceKlass::init_state_offset()));
   __ cmp(Rtemp, InstanceKlass::fully_initialized);
@@ -3980,7 +3980,7 @@ void TemplateTable::_new() {
   // get instance_size in InstanceKlass (scaled to a count of bytes)
   __ ldr_u32(Rsize, Address(Rklass, Klass::layout_helper_offset()));
 
-  // test to see if it has a finalizer or is malformed in some way
+  // test to see if it is malformed in some way
   // Klass::_lh_instance_slow_path_bit is really a bit mask, not bit number
   __ tbnz(Rsize, exact_log2(Klass::_lh_instance_slow_path_bit), slow_case);
 

src/hotspot/cpu/ppc/templateTable_ppc_64.cpp

@@ -3809,7 +3809,7 @@ void TemplateTable::_new() {
 
     __ lwz(Rinstance_size, in_bytes(Klass::layout_helper_offset()), RinstanceKlass);
 
-    // Make sure klass does not have has_finalizer, or is abstract, or interface or java/lang/Class.
+    // Make sure klass is not abstract, or interface or java/lang/Class.
     __ andi_(R0, Rinstance_size, Klass::_lh_instance_slow_path_bit); // slow path bit equals 0?
     __ bne(CCR0, Lslow_case);
 

src/hotspot/cpu/riscv/templateTable_riscv.cpp

@@ -3554,7 +3554,7 @@ void TemplateTable::_new() {
 
   // get instance_size in InstanceKlass (scaled to a count of bytes)
   __ lwu(x13, Address(x14, Klass::layout_helper_offset()));
-  // test to see if it has a finalizer or is malformed in some way
+  // test to see if is malformed in some way
   __ test_bit(t0, x13, exact_log2(Klass::_lh_instance_slow_path_bit));
   __ bnez(t0, slow_case);
 

src/hotspot/cpu/x86/templateTable_x86.cpp

@@ -4057,10 +4057,9 @@ void TemplateTable::_new() {
   __ jcc(Assembler::notEqual, slow_case);
 #endif
 
-  // make sure klass doesn't have finalizer
   // get instance_size in InstanceKlass (scaled to a count of bytes)
   __ movl(rdx, Address(rcx, Klass::layout_helper_offset()));
-  // test to see if it has a finalizer or is malformed in some way
+  // test to see if it is malformed in some way
   __ testl(rdx, Klass::_lh_instance_slow_path_bit);
   __ jcc(Assembler::notZero, slow_case);
 

src/hotspot/share/c1/c1_GraphBuilder.cpp

@@ -1556,8 +1556,7 @@ void GraphBuilder::call_register_finalizer() {
 
 
 void GraphBuilder::method_return(Value x, bool ignore_return) {
-  if (RegisterFinalizersAtInit &&
-      method()->intrinsic_id() == vmIntrinsics::_Object_init) {
+  if (method()->intrinsic_id() == vmIntrinsics::_Object_init) {
     call_register_finalizer();
   }
 

src/hotspot/share/classfile/classFileParser.cpp

@@ -4188,8 +4188,7 @@ void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
   // If it cannot be fast-path allocated, set a bit in the layout helper.
   // See documentation of InstanceKlass::can_be_fastpath_allocated().
   assert(ik->size_helper() > 0, "layout_helper is initialized");
-  if ((!RegisterFinalizersAtInit && ik->has_finalizer())
-      || ik->is_abstract() || ik->is_interface()
+  if (ik->is_abstract() || ik->is_interface()
       || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
       || ik->size_helper() >= FastAllocateSizeLimit) {
     // Forbid fast-path allocation.

src/hotspot/share/interpreter/abstractInterpreter.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2024, 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
@@ -149,7 +149,7 @@ AbstractInterpreter::MethodKind AbstractInterpreter::method_kind(const methodHan
       case vmIntrinsics::_dsqrt_strict:      return java_lang_math_sqrt_strict;
       case vmIntrinsics::_Reference_get:     return java_lang_ref_reference_get;
       case vmIntrinsics::_Object_init:
-        if (RegisterFinalizersAtInit && m->code_size() == 1) {
+        if (m->code_size() == 1) {
           // We need to execute the special return bytecode to check for
           // finalizer registration so create a normal frame.
           return zerolocals;

src/hotspot/share/interpreter/rewriter.cpp

@@ -531,7 +531,7 @@ void Rewriter::rewrite_bytecodes(TRAPS) {
   // determine index maps for Method* rewriting
   compute_index_maps();
 
-  if (RegisterFinalizersAtInit && _klass->name() == vmSymbols::java_lang_Object()) {
+  if (_klass->name() == vmSymbols::java_lang_Object()) {
     bool did_rewrite = false;
     int i = _methods->length();
     while (i-- > 0) {

src/hotspot/share/oops/instanceKlass.cpp

@@ -1509,16 +1509,8 @@ instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) {
 }
 
 instanceOop InstanceKlass::allocate_instance(TRAPS) {
-  bool has_finalizer_flag = has_finalizer(); // Query before possible GC
   size_t size = size_helper();  // Query before forming handle.
-
-  instanceOop i;
-
-  i = (instanceOop)Universe::heap()->obj_allocate(this, size, CHECK_NULL);
-  if (has_finalizer_flag && !RegisterFinalizersAtInit) {
-    i = register_finalizer(i, CHECK_NULL);
-  }
-  return i;
+  return (instanceOop)Universe::heap()->obj_allocate(this, size, CHECK_NULL);
 }
 
 instanceOop InstanceKlass::allocate_instance(oop java_class, TRAPS) {

src/hotspot/share/oops/instanceKlass.hpp

@@ -959,7 +959,6 @@ public:
   // This bit is initialized in classFileParser.cpp.
   // It is false under any of the following conditions:
   //  - the class is abstract (including any interface)
-  //  - the class has a finalizer (if !RegisterFinalizersAtInit)
   //  - the class size is larger than FastAllocateSizeLimit
   //  - the class is java/lang/Class, which cannot be allocated directly
   bool can_be_fastpath_allocated() const {

src/hotspot/share/opto/parse1.cpp

@@ -2239,8 +2239,7 @@ void Parse::rtm_deopt() {
 //------------------------------return_current---------------------------------
 // Append current _map to _exit_return
 void Parse::return_current(Node* value) {
-  if (RegisterFinalizersAtInit &&
-      method()->intrinsic_id() == vmIntrinsics::_Object_init) {
+  if (method()->intrinsic_id() == vmIntrinsics::_Object_init) {
     call_register_finalizer();
   }
 

src/hotspot/share/runtime/globals.hpp

@@ -671,10 +671,6 @@ const int ObjectAlignmentInBytes = 8;
   product(bool, PrintWarnings, true,                                        \
           "Print JVM warnings to output stream")                            \
                                                                             \
-  product(bool, RegisterFinalizersAtInit, true,                             \
-          "(Deprecated) Register finalizable objects at end of "            \
-          "Object.<init> or after allocation")                              \
-                                                                            \
   develop(bool, RegisterReferences, true,                                   \
           "Tell whether the VM should register soft/weak/final/phantom "    \
           "references")                                                     \