jdk

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/*
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 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "classfile/javaClasses.inline.hpp"
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#include "classfile/symbolTable.hpp"
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#include "classfile/vmClasses.hpp"
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#include "classfile/vmSymbols.hpp"
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#include "code/codeCache.hpp"
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#include "compiler/compilationPolicy.hpp"
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#include "compiler/compileBroker.hpp"
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#include "compiler/disassembler.hpp"
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#include "gc/shared/barrierSetNMethod.hpp"
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#include "gc/shared/collectedHeap.hpp"
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#include "interpreter/bytecodeTracer.hpp"
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#include "interpreter/interpreter.hpp"
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#include "interpreter/interpreterRuntime.hpp"
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#include "interpreter/linkResolver.hpp"
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#include "interpreter/templateTable.hpp"
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#include "jvm_io.h"
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#include "logging/log.hpp"
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#include "memory/oopFactory.hpp"
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#include "memory/resourceArea.hpp"
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#include "memory/universe.hpp"
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#include "oops/constantPool.inline.hpp"
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#include "oops/cpCache.inline.hpp"
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#include "oops/instanceKlass.inline.hpp"
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#include "oops/klass.inline.hpp"
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#include "oops/methodData.hpp"
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#include "oops/method.inline.hpp"
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#include "oops/objArrayKlass.hpp"
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#include "oops/objArrayOop.inline.hpp"
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#include "oops/oop.inline.hpp"
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#include "oops/symbol.hpp"
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#include "prims/jvmtiExport.hpp"
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#include "prims/methodHandles.hpp"
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#include "prims/nativeLookup.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/continuation.hpp"
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#include "runtime/deoptimization.hpp"
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#include "runtime/fieldDescriptor.inline.hpp"
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#include "runtime/frame.inline.hpp"
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#include "runtime/handles.inline.hpp"
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#include "runtime/icache.hpp"
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#include "runtime/interfaceSupport.inline.hpp"
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#include "runtime/java.hpp"
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#include "runtime/javaCalls.hpp"
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#include "runtime/jfieldIDWorkaround.hpp"
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#include "runtime/osThread.hpp"
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#include "runtime/sharedRuntime.hpp"
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#include "runtime/stackWatermarkSet.hpp"
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#include "runtime/stubRoutines.hpp"
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#include "runtime/synchronizer.hpp"
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#include "runtime/threadCritical.hpp"
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#include "utilities/align.hpp"
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#include "utilities/checkedCast.hpp"
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#include "utilities/copy.hpp"
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#include "utilities/events.hpp"
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#ifdef COMPILER2
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#include "opto/runtime.hpp"
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#endif
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// Helper class to access current interpreter state
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class LastFrameAccessor : public StackObj {
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  frame _last_frame;
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public:
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  LastFrameAccessor(JavaThread* current) {
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    assert(current == Thread::current(), "sanity");
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    _last_frame = current->last_frame();
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  }
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  bool is_interpreted_frame() const              { return _last_frame.is_interpreted_frame(); }
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  Method*   method() const                       { return _last_frame.interpreter_frame_method(); }
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  address   bcp() const                          { return _last_frame.interpreter_frame_bcp(); }
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  int       bci() const                          { return _last_frame.interpreter_frame_bci(); }
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  address   mdp() const                          { return _last_frame.interpreter_frame_mdp(); }
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  void      set_bcp(address bcp)                 { _last_frame.interpreter_frame_set_bcp(bcp); }
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  void      set_mdp(address dp)                  { _last_frame.interpreter_frame_set_mdp(dp); }
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  // pass method to avoid calling unsafe bcp_to_method (partial fix 4926272)
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  Bytecodes::Code code() const                   { return Bytecodes::code_at(method(), bcp()); }
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  Bytecode  bytecode() const                     { return Bytecode(method(), bcp()); }
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  int get_index_u1(Bytecodes::Code bc) const     { return bytecode().get_index_u1(bc); }
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  int get_index_u2(Bytecodes::Code bc) const     { return bytecode().get_index_u2(bc); }
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  int get_index_u4(Bytecodes::Code bc) const     { return bytecode().get_index_u4(bc); }
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  int number_of_dimensions() const               { return bcp()[3]; }
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  oop callee_receiver(Symbol* signature) {
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    return _last_frame.interpreter_callee_receiver(signature);
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  }
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  BasicObjectLock* monitor_begin() const {
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    return _last_frame.interpreter_frame_monitor_begin();
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  }
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  BasicObjectLock* monitor_end() const {
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    return _last_frame.interpreter_frame_monitor_end();
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  }
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  BasicObjectLock* next_monitor(BasicObjectLock* current) const {
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    return _last_frame.next_monitor_in_interpreter_frame(current);
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  }
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  frame& get_frame()                             { return _last_frame; }
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};
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//------------------------------------------------------------------------------------------------------------------------
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// State accessors
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void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread* current) {
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  LastFrameAccessor last_frame(current);
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  last_frame.set_bcp(bcp);
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  if (ProfileInterpreter) {
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    // ProfileTraps uses MDOs independently of ProfileInterpreter.
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    // That is why we must check both ProfileInterpreter and mdo != nullptr.
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    MethodData* mdo = last_frame.method()->method_data();
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    if (mdo != nullptr) {
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      NEEDS_CLEANUP;
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      last_frame.set_mdp(mdo->bci_to_dp(last_frame.bci()));
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    }
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  }
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}
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//------------------------------------------------------------------------------------------------------------------------
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// Constants
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JRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* current, bool wide))
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  // access constant pool
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  LastFrameAccessor last_frame(current);
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  ConstantPool* pool = last_frame.method()->constants();
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  int cp_index = wide ? last_frame.get_index_u2(Bytecodes::_ldc_w) : last_frame.get_index_u1(Bytecodes::_ldc);
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  constantTag tag = pool->tag_at(cp_index);
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  assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
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  Klass* klass = pool->klass_at(cp_index, CHECK);
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  oop java_class = klass->java_mirror();
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  current->set_vm_result(java_class);
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JRT_END
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JRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* current, Bytecodes::Code bytecode)) {
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  assert(bytecode == Bytecodes::_ldc ||
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         bytecode == Bytecodes::_ldc_w ||
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         bytecode == Bytecodes::_ldc2_w ||
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         bytecode == Bytecodes::_fast_aldc ||
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         bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
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  ResourceMark rm(current);
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  const bool is_fast_aldc = (bytecode == Bytecodes::_fast_aldc ||
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                             bytecode == Bytecodes::_fast_aldc_w);
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  LastFrameAccessor last_frame(current);
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  methodHandle m (current, last_frame.method());
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  Bytecode_loadconstant ldc(m, last_frame.bci());
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  // Double-check the size.  (Condy can have any type.)
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  BasicType type = ldc.result_type();
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  switch (type2size[type]) {
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  case 2: guarantee(bytecode == Bytecodes::_ldc2_w, ""); break;
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  case 1: guarantee(bytecode != Bytecodes::_ldc2_w, ""); break;
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  default: ShouldNotReachHere();
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  }
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  // Resolve the constant.  This does not do unboxing.
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  // But it does replace Universe::the_null_sentinel by null.
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  oop result = ldc.resolve_constant(CHECK);
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  assert(result != nullptr || is_fast_aldc, "null result only valid for fast_aldc");
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#ifdef ASSERT
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  {
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    // The bytecode wrappers aren't GC-safe so construct a new one
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    Bytecode_loadconstant ldc2(m, last_frame.bci());
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    int rindex = ldc2.cache_index();
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    if (rindex < 0)
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      rindex = m->constants()->cp_to_object_index(ldc2.pool_index());
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    if (rindex >= 0) {
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      oop coop = m->constants()->resolved_reference_at(rindex);
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      oop roop = (result == nullptr ? Universe::the_null_sentinel() : result);
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      assert(roop == coop, "expected result for assembly code");
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    }
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  }
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#endif
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  current->set_vm_result(result);
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  if (!is_fast_aldc) {
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    // Tell the interpreter how to unbox the primitive.
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    guarantee(java_lang_boxing_object::is_instance(result, type), "");
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    int offset = java_lang_boxing_object::value_offset(type);
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    intptr_t flags = ((as_TosState(type) << ConstantPoolCache::tos_state_shift)
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                      | (offset & ConstantPoolCache::field_index_mask));
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    current->set_vm_result_2((Metadata*)flags);
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  }
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}
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JRT_END
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//------------------------------------------------------------------------------------------------------------------------
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// Allocation
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JRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* current, ConstantPool* pool, int index))
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  Klass* k = pool->klass_at(index, CHECK);
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  InstanceKlass* klass = InstanceKlass::cast(k);
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  // Make sure we are not instantiating an abstract klass
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  klass->check_valid_for_instantiation(true, CHECK);
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  // Make sure klass is initialized
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  klass->initialize(CHECK);
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  oop obj = klass->allocate_instance(CHECK);
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  current->set_vm_result(obj);
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JRT_END
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JRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* current, BasicType type, jint size))
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  oop obj = oopFactory::new_typeArray(type, size, CHECK);
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  current->set_vm_result(obj);
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JRT_END
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JRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* current, ConstantPool* pool, int index, jint size))
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  Klass*    klass = pool->klass_at(index, CHECK);
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  objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
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  current->set_vm_result(obj);
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JRT_END
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JRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* current, jint* first_size_address))
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  // We may want to pass in more arguments - could make this slightly faster
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  LastFrameAccessor last_frame(current);
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  ConstantPool* constants = last_frame.method()->constants();
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  int          i = last_frame.get_index_u2(Bytecodes::_multianewarray);
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  Klass* klass   = constants->klass_at(i, CHECK);
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  int   nof_dims = last_frame.number_of_dimensions();
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  assert(klass->is_klass(), "not a class");
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  assert(nof_dims >= 1, "multianewarray rank must be nonzero");
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  // We must create an array of jints to pass to multi_allocate.
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  ResourceMark rm(current);
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  const int small_dims = 10;
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  jint dim_array[small_dims];
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  jint *dims = &dim_array[0];
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  if (nof_dims > small_dims) {
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    dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
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  }
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  for (int index = 0; index < nof_dims; index++) {
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    // offset from first_size_address is addressed as local[index]
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    int n = Interpreter::local_offset_in_bytes(index)/jintSize;
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    dims[index] = first_size_address[n];
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  }
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  oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
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  current->set_vm_result(obj);
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JRT_END
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JRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
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  assert(oopDesc::is_oop(obj), "must be a valid oop");
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  assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
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  InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
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JRT_END
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// Quicken instance-of and check-cast bytecodes
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JRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* current))
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  // Force resolving; quicken the bytecode
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  LastFrameAccessor last_frame(current);
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  int which = last_frame.get_index_u2(Bytecodes::_checkcast);
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  ConstantPool* cpool = last_frame.method()->constants();
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  // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
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  // program we might have seen an unquick'd bytecode in the interpreter but have another
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  // thread quicken the bytecode before we get here.
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  // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
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  Klass* klass = cpool->klass_at(which, CHECK);
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  current->set_vm_result_2(klass);
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JRT_END
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//------------------------------------------------------------------------------------------------------------------------
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// Exceptions
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void InterpreterRuntime::note_trap_inner(JavaThread* current, int reason,
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                                         const methodHandle& trap_method, int trap_bci) {
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  if (trap_method.not_null()) {
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    MethodData* trap_mdo = trap_method->method_data();
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    if (trap_mdo == nullptr) {
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      ExceptionMark em(current);
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      JavaThread* THREAD = current; // For exception macros.
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      Method::build_profiling_method_data(trap_method, THREAD);
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      if (HAS_PENDING_EXCEPTION) {
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        // Only metaspace OOM is expected. No Java code executed.
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        assert((PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())),
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               "we expect only an OOM error here");
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        CLEAR_PENDING_EXCEPTION;
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      }
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      trap_mdo = trap_method->method_data();
312
      // and fall through...
313
    }
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    if (trap_mdo != nullptr) {
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      // Update per-method count of trap events.  The interpreter
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      // is updating the MDO to simulate the effect of compiler traps.
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      Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
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    }
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  }
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}
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// Assume the compiler is (or will be) interested in this event.
323
// If necessary, create an MDO to hold the information, and record it.
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void InterpreterRuntime::note_trap(JavaThread* current, int reason) {
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  assert(ProfileTraps, "call me only if profiling");
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  LastFrameAccessor last_frame(current);
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  methodHandle trap_method(current, last_frame.method());
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  int trap_bci = trap_method->bci_from(last_frame.bcp());
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  note_trap_inner(current, reason, trap_method, trap_bci);
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}
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static Handle get_preinitialized_exception(Klass* k, TRAPS) {
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  // get klass
334
  InstanceKlass* klass = InstanceKlass::cast(k);
335
  assert(klass->is_initialized(),
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         "this klass should have been initialized during VM initialization");
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  // create instance - do not call constructor since we may have no
338
  // (java) stack space left (should assert constructor is empty)
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  Handle exception;
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  oop exception_oop = klass->allocate_instance(CHECK_(exception));
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  exception = Handle(THREAD, exception_oop);
342
  if (StackTraceInThrowable) {
343
    java_lang_Throwable::fill_in_stack_trace(exception);
344
  }
345
  return exception;
346
}
347

348
// Special handling for stack overflow: since we don't have any (java) stack
349
// space left we use the pre-allocated & pre-initialized StackOverflowError
350
// klass to create an stack overflow error instance.  We do not call its
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// constructor for the same reason (it is empty, anyway).
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JRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* current))
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  Handle exception = get_preinitialized_exception(
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                                 vmClasses::StackOverflowError_klass(),
355
                                 CHECK);
356
  // Increment counter for hs_err file reporting
357
  Atomic::inc(&Exceptions::_stack_overflow_errors);
358
  // Remove the ScopedValue bindings in case we got a StackOverflowError
359
  // while we were trying to manipulate ScopedValue bindings.
360
  current->clear_scopedValueBindings();
361
  THROW_HANDLE(exception);
362
JRT_END
363

364
JRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* current))
365
  Handle exception = get_preinitialized_exception(
366
                                 vmClasses::StackOverflowError_klass(),
367
                                 CHECK);
368
  java_lang_Throwable::set_message(exception(),
369
          Universe::delayed_stack_overflow_error_message());
370
  // Increment counter for hs_err file reporting
371
  Atomic::inc(&Exceptions::_stack_overflow_errors);
372
  // Remove the ScopedValue bindings in case we got a StackOverflowError
373
  // while we were trying to manipulate ScopedValue bindings.
374
  current->clear_scopedValueBindings();
375
  THROW_HANDLE(exception);
376
JRT_END
377

378
JRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* current, char* name, char* message))
379
  // lookup exception klass
380
  TempNewSymbol s = SymbolTable::new_symbol(name);
381
  if (ProfileTraps) {
382
    if (s == vmSymbols::java_lang_ArithmeticException()) {
383
      note_trap(current, Deoptimization::Reason_div0_check);
384
    } else if (s == vmSymbols::java_lang_NullPointerException()) {
385
      note_trap(current, Deoptimization::Reason_null_check);
386
    }
387
  }
388
  // create exception
389
  Handle exception = Exceptions::new_exception(current, s, message);
390
  current->set_vm_result(exception());
391
JRT_END
392

393

394
JRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* current, char* name, oopDesc* obj))
395
  // Produce the error message first because note_trap can safepoint
396
  ResourceMark rm(current);
397
  const char* klass_name = obj->klass()->external_name();
398
  // lookup exception klass
399
  TempNewSymbol s = SymbolTable::new_symbol(name);
400
  if (ProfileTraps) {
401
    if (s == vmSymbols::java_lang_ArrayStoreException()) {
402
      note_trap(current, Deoptimization::Reason_array_check);
403
    } else {
404
      note_trap(current, Deoptimization::Reason_class_check);
405
    }
406
  }
407
  // create exception, with klass name as detail message
408
  Handle exception = Exceptions::new_exception(current, s, klass_name);
409
  current->set_vm_result(exception());
410
JRT_END
411

412
JRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* current, arrayOopDesc* a, jint index))
413
  // Produce the error message first because note_trap can safepoint
414
  ResourceMark rm(current);
415
  stringStream ss;
416
  ss.print("Index %d out of bounds for length %d", index, a->length());
417

418
  if (ProfileTraps) {
419
    note_trap(current, Deoptimization::Reason_range_check);
420
  }
421

422
  THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), ss.as_string());
423
JRT_END
424

425
JRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
426
  JavaThread* current, oopDesc* obj))
427

428
  // Produce the error message first because note_trap can safepoint
429
  ResourceMark rm(current);
430
  char* message = SharedRuntime::generate_class_cast_message(
431
    current, obj->klass());
432

433
  if (ProfileTraps) {
434
    note_trap(current, Deoptimization::Reason_class_check);
435
  }
436

437
  // create exception
438
  THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
439
JRT_END
440

441
// exception_handler_for_exception(...) returns the continuation address,
442
// the exception oop (via TLS) and sets the bci/bcp for the continuation.
443
// The exception oop is returned to make sure it is preserved over GC (it
444
// is only on the stack if the exception was thrown explicitly via athrow).
445
// During this operation, the expression stack contains the values for the
446
// bci where the exception happened. If the exception was propagated back
447
// from a call, the expression stack contains the values for the bci at the
448
// invoke w/o arguments (i.e., as if one were inside the call).
449
// Note that the implementation of this method assumes it's only called when an exception has actually occured
450
JRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* current, oopDesc* exception))
451
  // We get here after we have unwound from a callee throwing an exception
452
  // into the interpreter. Any deferred stack processing is notified of
453
  // the event via the StackWatermarkSet.
454
  StackWatermarkSet::after_unwind(current);
455

456
  LastFrameAccessor last_frame(current);
457
  Handle             h_exception(current, exception);
458
  methodHandle       h_method   (current, last_frame.method());
459
  constantPoolHandle h_constants(current, h_method->constants());
460
  bool               should_repeat;
461
  int                handler_bci;
462
  int                current_bci = last_frame.bci();
463

464
  if (current->frames_to_pop_failed_realloc() > 0) {
465
    // Allocation of scalar replaced object used in this frame
466
    // failed. Unconditionally pop the frame.
467
    current->dec_frames_to_pop_failed_realloc();
468
    current->set_vm_result(h_exception());
469
    // If the method is synchronized we already unlocked the monitor
470
    // during deoptimization so the interpreter needs to skip it when
471
    // the frame is popped.
472
    current->set_do_not_unlock_if_synchronized(true);
473
    return Interpreter::remove_activation_entry();
474
  }
475

476
  // Need to do this check first since when _do_not_unlock_if_synchronized
477
  // is set, we don't want to trigger any classloading which may make calls
478
  // into java, or surprisingly find a matching exception handler for bci 0
479
  // since at this moment the method hasn't been "officially" entered yet.
480
  if (current->do_not_unlock_if_synchronized()) {
481
    ResourceMark rm;
482
    assert(current_bci == 0,  "bci isn't zero for do_not_unlock_if_synchronized");
483
    current->set_vm_result(exception);
484
    return Interpreter::remove_activation_entry();
485
  }
486

487
  do {
488
    should_repeat = false;
489

490
    // assertions
491
    assert(h_exception.not_null(), "null exceptions should be handled by athrow");
492
    // Check that exception is a subclass of Throwable.
493
    assert(h_exception->is_a(vmClasses::Throwable_klass()),
494
           "Exception not subclass of Throwable");
495

496
    // tracing
497
    if (log_is_enabled(Info, exceptions)) {
498
      ResourceMark rm(current);
499
      stringStream tempst;
500
      tempst.print("interpreter method <%s>\n"
501
                   " at bci %d for thread " INTPTR_FORMAT " (%s)",
502
                   h_method->print_value_string(), current_bci, p2i(current), current->name());
503
      Exceptions::log_exception(h_exception, tempst.as_string());
504
    }
505
// Don't go paging in something which won't be used.
506
//     else if (extable->length() == 0) {
507
//       // disabled for now - interpreter is not using shortcut yet
508
//       // (shortcut is not to call runtime if we have no exception handlers)
509
//       // warning("performance bug: should not call runtime if method has no exception handlers");
510
//     }
511
    // for AbortVMOnException flag
512
    Exceptions::debug_check_abort(h_exception);
513

514
    // exception handler lookup
515
    Klass* klass = h_exception->klass();
516
    handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);
517
    if (HAS_PENDING_EXCEPTION) {
518
      // We threw an exception while trying to find the exception handler.
519
      // Transfer the new exception to the exception handle which will
520
      // be set into thread local storage, and do another lookup for an
521
      // exception handler for this exception, this time starting at the
522
      // BCI of the exception handler which caused the exception to be
523
      // thrown (bug 4307310).
524
      h_exception = Handle(THREAD, PENDING_EXCEPTION);
525
      CLEAR_PENDING_EXCEPTION;
526
      if (handler_bci >= 0) {
527
        current_bci = handler_bci;
528
        should_repeat = true;
529
      }
530
    }
531
  } while (should_repeat == true);
532

533
#if INCLUDE_JVMCI
534
  if (EnableJVMCI && h_method->method_data() != nullptr) {
535
    ResourceMark rm(current);
536
    MethodData* mdo = h_method->method_data();
537

538
    // Lock to read ProfileData, and ensure lock is not broken by a safepoint
539
    MutexLocker ml(mdo->extra_data_lock(), Mutex::_no_safepoint_check_flag);
540

541
    ProfileData* pdata = mdo->allocate_bci_to_data(current_bci, nullptr);
542
    if (pdata != nullptr && pdata->is_BitData()) {
543
      BitData* bit_data = (BitData*) pdata;
544
      bit_data->set_exception_seen();
545
    }
546
  }
547
#endif
548

549
  // notify JVMTI of an exception throw; JVMTI will detect if this is a first
550
  // time throw or a stack unwinding throw and accordingly notify the debugger
551
  if (JvmtiExport::can_post_on_exceptions()) {
552
    JvmtiExport::post_exception_throw(current, h_method(), last_frame.bcp(), h_exception());
553
  }
554

555
  address continuation = nullptr;
556
  address handler_pc = nullptr;
557
  if (handler_bci < 0 || !current->stack_overflow_state()->reguard_stack((address) &continuation)) {
558
    // Forward exception to callee (leaving bci/bcp untouched) because (a) no
559
    // handler in this method, or (b) after a stack overflow there is not yet
560
    // enough stack space available to reprotect the stack.
561
    continuation = Interpreter::remove_activation_entry();
562
#if COMPILER2_OR_JVMCI
563
    // Count this for compilation purposes
564
    h_method->interpreter_throwout_increment(THREAD);
565
#endif
566
  } else {
567
    // handler in this method => change bci/bcp to handler bci/bcp and continue there
568
    handler_pc = h_method->code_base() + handler_bci;
569
    h_method->set_exception_handler_entered(handler_bci); // profiling
570
#ifndef ZERO
571
    set_bcp_and_mdp(handler_pc, current);
572
    continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
573
#else
574
    continuation = (address)(intptr_t) handler_bci;
575
#endif
576
  }
577

578
  // notify debugger of an exception catch
579
  // (this is good for exceptions caught in native methods as well)
580
  if (JvmtiExport::can_post_on_exceptions()) {
581
    JvmtiExport::notice_unwind_due_to_exception(current, h_method(), handler_pc, h_exception(), (handler_pc != nullptr));
582
  }
583

584
  current->set_vm_result(h_exception());
585
  return continuation;
586
JRT_END
587

588

589
JRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* current))
590
  assert(current->has_pending_exception(), "must only be called if there's an exception pending");
591
  // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
592
JRT_END
593

594

595
JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* current))
596
  THROW(vmSymbols::java_lang_AbstractMethodError());
597
JRT_END
598

599
// This method is called from the "abstract_entry" of the interpreter.
600
// At that point, the arguments have already been removed from the stack
601
// and therefore we don't have the receiver object at our fingertips. (Though,
602
// on some platforms the receiver still resides in a register...). Thus,
603
// we have no choice but print an error message not containing the receiver
604
// type.
605
JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorWithMethod(JavaThread* current,
606
                                                                        Method* missingMethod))
607
  ResourceMark rm(current);
608
  assert(missingMethod != nullptr, "sanity");
609
  methodHandle m(current, missingMethod);
610
  LinkResolver::throw_abstract_method_error(m, THREAD);
611
JRT_END
612

613
JRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodErrorVerbose(JavaThread* current,
614
                                                                     Klass* recvKlass,
615
                                                                     Method* missingMethod))
616
  ResourceMark rm(current);
617
  methodHandle mh = methodHandle(current, missingMethod);
618
  LinkResolver::throw_abstract_method_error(mh, recvKlass, THREAD);
619
JRT_END
620

621

622
JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
623
  THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
624
JRT_END
625

626
JRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeErrorVerbose(JavaThread* current,
627
                                                                              Klass* recvKlass,
628
                                                                              Klass* interfaceKlass))
629
  ResourceMark rm(current);
630
  char buf[1000];
631
  buf[0] = '\0';
632
  jio_snprintf(buf, sizeof(buf),
633
               "Class %s does not implement the requested interface %s",
634
               recvKlass ? recvKlass->external_name() : "nullptr",
635
               interfaceKlass ? interfaceKlass->external_name() : "nullptr");
636
  THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
637
JRT_END
638

639
JRT_ENTRY(void, InterpreterRuntime::throw_NullPointerException(JavaThread* current))
640
  THROW(vmSymbols::java_lang_NullPointerException());
641
JRT_END
642

643
//------------------------------------------------------------------------------------------------------------------------
644
// Fields
645
//
646

647
void InterpreterRuntime::resolve_get_put(JavaThread* current, Bytecodes::Code bytecode) {
648
  LastFrameAccessor last_frame(current);
649
  constantPoolHandle pool(current, last_frame.method()->constants());
650
  methodHandle m(current, last_frame.method());
651

652
  resolve_get_put(bytecode, last_frame.get_index_u2(bytecode), m, pool, true /*initialize_holder*/, current);
653
}
654

655
void InterpreterRuntime::resolve_get_put(Bytecodes::Code bytecode, int field_index,
656
                                         methodHandle& m,
657
                                         constantPoolHandle& pool,
658
                                         bool initialize_holder, TRAPS) {
659
  fieldDescriptor info;
660
  bool is_put    = (bytecode == Bytecodes::_putfield  || bytecode == Bytecodes::_nofast_putfield ||
661
                    bytecode == Bytecodes::_putstatic);
662
  bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
663

664
  {
665
    JvmtiHideSingleStepping jhss(THREAD);
666
    LinkResolver::resolve_field_access(info, pool, field_index,
667
                                       m, bytecode, initialize_holder, CHECK);
668
  } // end JvmtiHideSingleStepping
669

670
  // check if link resolution caused cpCache to be updated
671
  if (pool->resolved_field_entry_at(field_index)->is_resolved(bytecode)) return;
672

673
  // compute auxiliary field attributes
674
  TosState state  = as_TosState(info.field_type());
675

676
  // Resolution of put instructions on final fields is delayed. That is required so that
677
  // exceptions are thrown at the correct place (when the instruction is actually invoked).
678
  // If we do not resolve an instruction in the current pass, leaving the put_code
679
  // set to zero will cause the next put instruction to the same field to reresolve.
680

681
  // Resolution of put instructions to final instance fields with invalid updates (i.e.,
682
  // to final instance fields with updates originating from a method different than <init>)
683
  // is inhibited. A putfield instruction targeting an instance final field must throw
684
  // an IllegalAccessError if the instruction is not in an instance
685
  // initializer method <init>. If resolution were not inhibited, a putfield
686
  // in an initializer method could be resolved in the initializer. Subsequent
687
  // putfield instructions to the same field would then use cached information.
688
  // As a result, those instructions would not pass through the VM. That is,
689
  // checks in resolve_field_access() would not be executed for those instructions
690
  // and the required IllegalAccessError would not be thrown.
691
  //
692
  // Also, we need to delay resolving getstatic and putstatic instructions until the
693
  // class is initialized.  This is required so that access to the static
694
  // field will call the initialization function every time until the class
695
  // is completely initialized ala. in 2.17.5 in JVM Specification.
696
  InstanceKlass* klass = info.field_holder();
697
  bool uninitialized_static = is_static && !klass->is_initialized();
698
  bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&
699
                                      info.has_initialized_final_update();
700
  assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");
701

702
  Bytecodes::Code get_code = (Bytecodes::Code)0;
703
  Bytecodes::Code put_code = (Bytecodes::Code)0;
704
  if (!uninitialized_static) {
705
    get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
706
    if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {
707
      put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
708
    }
709
  }
710

711
  ResolvedFieldEntry* entry = pool->resolved_field_entry_at(field_index);
712
  entry->set_flags(info.access_flags().is_final(), info.access_flags().is_volatile());
713
  entry->fill_in(info.field_holder(), info.offset(),
714
                 checked_cast<u2>(info.index()), checked_cast<u1>(state),
715
                 static_cast<u1>(get_code), static_cast<u1>(put_code));
716
}
717

718

719
//------------------------------------------------------------------------------------------------------------------------
720
// Synchronization
721
//
722
// The interpreter's synchronization code is factored out so that it can
723
// be shared by method invocation and synchronized blocks.
724
//%note synchronization_3
725

726
//%note monitor_1
727
JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* current, BasicObjectLock* elem))
728
  assert(LockingMode != LM_LIGHTWEIGHT, "Should call monitorenter_obj() when using the new lightweight locking");
729
#ifdef ASSERT
730
  current->last_frame().interpreter_frame_verify_monitor(elem);
731
#endif
732
  Handle h_obj(current, elem->obj());
733
  assert(Universe::heap()->is_in_or_null(h_obj()),
734
         "must be null or an object");
735
  ObjectSynchronizer::enter(h_obj, elem->lock(), current);
736
  assert(Universe::heap()->is_in_or_null(elem->obj()),
737
         "must be null or an object");
738
#ifdef ASSERT
739
  current->last_frame().interpreter_frame_verify_monitor(elem);
740
#endif
741
JRT_END
742

743
// NOTE: We provide a separate implementation for the new lightweight locking to workaround a limitation
744
// of registers in x86_32. This entry point accepts an oop instead of a BasicObjectLock*.
745
// The problem is that we would need to preserve the register that holds the BasicObjectLock,
746
// but we are using that register to hold the thread. We don't have enough registers to
747
// also keep the BasicObjectLock, but we don't really need it anyway, we only need
748
// the object. See also InterpreterMacroAssembler::lock_object().
749
// As soon as legacy stack-locking goes away we could remove the other monitorenter() entry
750
// point, and only use oop-accepting entries (same for monitorexit() below).
751
JRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter_obj(JavaThread* current, oopDesc* obj))
752
  assert(LockingMode == LM_LIGHTWEIGHT, "Should call monitorenter() when not using the new lightweight locking");
753
  Handle h_obj(current, cast_to_oop(obj));
754
  assert(Universe::heap()->is_in_or_null(h_obj()),
755
         "must be null or an object");
756
  ObjectSynchronizer::enter(h_obj, nullptr, current);
757
  return;
758
JRT_END
759

760
JRT_LEAF(void, InterpreterRuntime::monitorexit(BasicObjectLock* elem))
761
  oop obj = elem->obj();
762
  assert(Universe::heap()->is_in(obj), "must be an object");
763
  // The object could become unlocked through a JNI call, which we have no other checks for.
764
  // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
765
  if (obj->is_unlocked()) {
766
    if (CheckJNICalls) {
767
      fatal("Object has been unlocked by JNI");
768
    }
769
    return;
770
  }
771
  ObjectSynchronizer::exit(obj, elem->lock(), JavaThread::current());
772
  // Free entry. If it is not cleared, the exception handling code will try to unlock the monitor
773
  // again at method exit or in the case of an exception.
774
  elem->set_obj(nullptr);
775
JRT_END
776

777

778
JRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* current))
779
  THROW(vmSymbols::java_lang_IllegalMonitorStateException());
780
JRT_END
781

782

783
JRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* current))
784
  // Returns an illegal exception to install into the current thread. The
785
  // pending_exception flag is cleared so normal exception handling does not
786
  // trigger. Any current installed exception will be overwritten. This
787
  // method will be called during an exception unwind.
788

789
  assert(!HAS_PENDING_EXCEPTION, "no pending exception");
790
  Handle exception(current, current->vm_result());
791
  assert(exception() != nullptr, "vm result should be set");
792
  current->set_vm_result(nullptr); // clear vm result before continuing (may cause memory leaks and assert failures)
793
  exception = get_preinitialized_exception(vmClasses::IllegalMonitorStateException_klass(), CATCH);
794
  current->set_vm_result(exception());
795
JRT_END
796

797

798
//------------------------------------------------------------------------------------------------------------------------
799
// Invokes
800

801
JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* current, Method* method, address bcp))
802
  return method->orig_bytecode_at(method->bci_from(bcp));
803
JRT_END
804

805
JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* current, Method* method, address bcp, Bytecodes::Code new_code))
806
  method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
807
JRT_END
808

809
JRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* current, Method* method, address bcp))
810
  JvmtiExport::post_raw_breakpoint(current, method, bcp);
811
JRT_END
812

813
void InterpreterRuntime::resolve_invoke(JavaThread* current, Bytecodes::Code bytecode) {
814
  LastFrameAccessor last_frame(current);
815
  // extract receiver from the outgoing argument list if necessary
816
  Handle receiver(current, nullptr);
817
  if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||
818
      bytecode == Bytecodes::_invokespecial) {
819
    ResourceMark rm(current);
820
    methodHandle m (current, last_frame.method());
821
    Bytecode_invoke call(m, last_frame.bci());
822
    Symbol* signature = call.signature();
823
    receiver = Handle(current, last_frame.callee_receiver(signature));
824

825
    assert(Universe::heap()->is_in_or_null(receiver()),
826
           "sanity check");
827
    assert(receiver.is_null() ||
828
           !Universe::heap()->is_in(receiver->klass()),
829
           "sanity check");
830
  }
831

832
  // resolve method
833
  CallInfo info;
834
  constantPoolHandle pool(current, last_frame.method()->constants());
835

836
  methodHandle resolved_method;
837

838
  int method_index = last_frame.get_index_u2(bytecode);
839
  {
840
    JvmtiHideSingleStepping jhss(current);
841
    JavaThread* THREAD = current; // For exception macros.
842
    LinkResolver::resolve_invoke(info, receiver, pool,
843
                                 method_index, bytecode,
844
                                 THREAD);
845

846
    if (HAS_PENDING_EXCEPTION) {
847
      if (ProfileTraps && PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_NullPointerException()) {
848
        // Preserve the original exception across the call to note_trap()
849
        PreserveExceptionMark pm(current);
850
        // Recording the trap will help the compiler to potentially recognize this exception as "hot"
851
        note_trap(current, Deoptimization::Reason_null_check);
852
      }
853
      return;
854
    }
855

856
    resolved_method = methodHandle(current, info.resolved_method());
857
  } // end JvmtiHideSingleStepping
858

859
  update_invoke_cp_cache_entry(info, bytecode, resolved_method, pool, method_index);
860
}
861

862
void InterpreterRuntime::update_invoke_cp_cache_entry(CallInfo& info, Bytecodes::Code bytecode,
863
                                                      methodHandle& resolved_method,
864
                                                      constantPoolHandle& pool,
865
                                                      int method_index) {
866
  // Don't allow safepoints until the method is cached.
867
  NoSafepointVerifier nsv;
868

869
  // check if link resolution caused cpCache to be updated
870
  ConstantPoolCache* cache = pool->cache();
871
  if (cache->resolved_method_entry_at(method_index)->is_resolved(bytecode)) return;
872

873
#ifdef ASSERT
874
  if (bytecode == Bytecodes::_invokeinterface) {
875
    if (resolved_method->method_holder() == vmClasses::Object_klass()) {
876
      // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
877
      // (see also CallInfo::set_interface for details)
878
      assert(info.call_kind() == CallInfo::vtable_call ||
879
             info.call_kind() == CallInfo::direct_call, "");
880
      assert(resolved_method->is_final() || info.has_vtable_index(),
881
             "should have been set already");
882
    } else if (!resolved_method->has_itable_index()) {
883
      // Resolved something like CharSequence.toString.  Use vtable not itable.
884
      assert(info.call_kind() != CallInfo::itable_call, "");
885
    } else {
886
      // Setup itable entry
887
      assert(info.call_kind() == CallInfo::itable_call, "");
888
      int index = resolved_method->itable_index();
889
      assert(info.itable_index() == index, "");
890
    }
891
  } else if (bytecode == Bytecodes::_invokespecial) {
892
    assert(info.call_kind() == CallInfo::direct_call, "must be direct call");
893
  } else {
894
    assert(info.call_kind() == CallInfo::direct_call ||
895
           info.call_kind() == CallInfo::vtable_call, "");
896
  }
897
#endif
898
  // Get sender and only set cpCache entry to resolved if it is not an
899
  // interface.  The receiver for invokespecial calls within interface
900
  // methods must be checked for every call.
901
  InstanceKlass* sender = pool->pool_holder();
902

903
  switch (info.call_kind()) {
904
  case CallInfo::direct_call:
905
    cache->set_direct_call(bytecode, method_index, resolved_method, sender->is_interface());
906
    break;
907
  case CallInfo::vtable_call:
908
    cache->set_vtable_call(bytecode, method_index, resolved_method, info.vtable_index());
909
    break;
910
  case CallInfo::itable_call:
911
    cache->set_itable_call(
912
      bytecode,
913
      method_index,
914
      info.resolved_klass(),
915
      resolved_method,
916
      info.itable_index());
917
    break;
918
  default:  ShouldNotReachHere();
919
  }
920
}
921

922
void InterpreterRuntime::cds_resolve_invoke(Bytecodes::Code bytecode, int method_index,
923
                                            constantPoolHandle& pool, TRAPS) {
924
  LinkInfo link_info(pool, method_index, bytecode, CHECK);
925

926
  if (!link_info.resolved_klass()->is_instance_klass() || InstanceKlass::cast(link_info.resolved_klass())->is_linked()) {
927
    CallInfo call_info;
928
    switch (bytecode) {
929
      case Bytecodes::_invokevirtual:   LinkResolver::cds_resolve_virtual_call  (call_info, link_info, CHECK); break;
930
      case Bytecodes::_invokeinterface: LinkResolver::cds_resolve_interface_call(call_info, link_info, CHECK); break;
931
      case Bytecodes::_invokespecial:   LinkResolver::cds_resolve_special_call  (call_info, link_info, CHECK); break;
932

933
      default: fatal("Unimplemented: %s", Bytecodes::name(bytecode));
934
    }
935
    methodHandle resolved_method(THREAD, call_info.resolved_method());
936
    guarantee(resolved_method->method_holder()->is_linked(), "");
937
    update_invoke_cp_cache_entry(call_info, bytecode, resolved_method, pool, method_index);
938
  } else {
939
    // FIXME: why a shared class is not linked yet?
940
    // Can't link it here since there are no guarantees it'll be prelinked on the next run.
941
    ResourceMark rm;
942
    InstanceKlass* resolved_iklass = InstanceKlass::cast(link_info.resolved_klass());
943
    log_info(cds, resolve)("Not resolved: class not linked: %s %s %s",
944
                           resolved_iklass->is_shared() ? "is_shared" : "",
945
                           resolved_iklass->init_state_name(),
946
                           resolved_iklass->external_name());
947
  }
948
}
949

950
// First time execution:  Resolve symbols, create a permanent MethodType object.
951
void InterpreterRuntime::resolve_invokehandle(JavaThread* current) {
952
  const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
953
  LastFrameAccessor last_frame(current);
954

955
  // resolve method
956
  CallInfo info;
957
  constantPoolHandle pool(current, last_frame.method()->constants());
958
  int method_index = last_frame.get_index_u2(bytecode);
959
  {
960
    JvmtiHideSingleStepping jhss(current);
961
    JavaThread* THREAD = current; // For exception macros.
962
    LinkResolver::resolve_invoke(info, Handle(), pool,
963
                                 method_index, bytecode,
964
                                 CHECK);
965
  } // end JvmtiHideSingleStepping
966

967
  pool->cache()->set_method_handle(method_index, info);
968
}
969

970
// First time execution:  Resolve symbols, create a permanent CallSite object.
971
void InterpreterRuntime::resolve_invokedynamic(JavaThread* current) {
972
  LastFrameAccessor last_frame(current);
973
  const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
974

975
  // resolve method
976
  CallInfo info;
977
  constantPoolHandle pool(current, last_frame.method()->constants());
978
  int index = last_frame.get_index_u4(bytecode);
979
  {
980
    JvmtiHideSingleStepping jhss(current);
981
    JavaThread* THREAD = current; // For exception macros.
982
    LinkResolver::resolve_invoke(info, Handle(), pool,
983
                                 index, bytecode, CHECK);
984
  } // end JvmtiHideSingleStepping
985

986
  pool->cache()->set_dynamic_call(info, index);
987
}
988

989
// This function is the interface to the assembly code. It returns the resolved
990
// cpCache entry.  This doesn't safepoint, but the helper routines safepoint.
991
// This function will check for redefinition!
992
JRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* current, Bytecodes::Code bytecode)) {
993
  switch (bytecode) {
994
  case Bytecodes::_getstatic:
995
  case Bytecodes::_putstatic:
996
  case Bytecodes::_getfield:
997
  case Bytecodes::_putfield:
998
    resolve_get_put(current, bytecode);
999
    break;
1000
  case Bytecodes::_invokevirtual:
1001
  case Bytecodes::_invokespecial:
1002
  case Bytecodes::_invokestatic:
1003
  case Bytecodes::_invokeinterface:
1004
    resolve_invoke(current, bytecode);
1005
    break;
1006
  case Bytecodes::_invokehandle:
1007
    resolve_invokehandle(current);
1008
    break;
1009
  case Bytecodes::_invokedynamic:
1010
    resolve_invokedynamic(current);
1011
    break;
1012
  default:
1013
    fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));
1014
    break;
1015
  }
1016
}
1017
JRT_END
1018

1019
//------------------------------------------------------------------------------------------------------------------------
1020
// Miscellaneous
1021

1022

1023
nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* current, address branch_bcp) {
1024
  // Enable WXWrite: the function is called directly by interpreter.
1025
  MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, current));
1026

1027
  // frequency_counter_overflow_inner can throw async exception.
1028
  nmethod* nm = frequency_counter_overflow_inner(current, branch_bcp);
1029
  assert(branch_bcp != nullptr || nm == nullptr, "always returns null for non OSR requests");
1030
  if (branch_bcp != nullptr && nm != nullptr) {
1031
    // This was a successful request for an OSR nmethod.  Because
1032
    // frequency_counter_overflow_inner ends with a safepoint check,
1033
    // nm could have been unloaded so look it up again.  It's unsafe
1034
    // to examine nm directly since it might have been freed and used
1035
    // for something else.
1036
    LastFrameAccessor last_frame(current);
1037
    Method* method =  last_frame.method();
1038
    int bci = method->bci_from(last_frame.bcp());
1039
    nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
1040
    BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1041
    if (nm != nullptr && bs_nm != nullptr) {
1042
      // in case the transition passed a safepoint we need to barrier this again
1043
      if (!bs_nm->nmethod_osr_entry_barrier(nm)) {
1044
        nm = nullptr;
1045
      }
1046
    }
1047
  }
1048
  if (nm != nullptr && current->is_interp_only_mode()) {
1049
    // Normally we never get an nm if is_interp_only_mode() is true, because
1050
    // policy()->event has a check for this and won't compile the method when
1051
    // true. However, it's possible for is_interp_only_mode() to become true
1052
    // during the compilation. We don't want to return the nm in that case
1053
    // because we want to continue to execute interpreted.
1054
    nm = nullptr;
1055
  }
1056
#ifndef PRODUCT
1057
  if (TraceOnStackReplacement) {
1058
    if (nm != nullptr) {
1059
      tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));
1060
      nm->print();
1061
    }
1062
  }
1063
#endif
1064
  return nm;
1065
}
1066

1067
JRT_ENTRY(nmethod*,
1068
          InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* current, address branch_bcp))
1069
  // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
1070
  // flag, in case this method triggers classloading which will call into Java.
1071
  UnlockFlagSaver fs(current);
1072

1073
  LastFrameAccessor last_frame(current);
1074
  assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1075
  methodHandle method(current, last_frame.method());
1076
  const int branch_bci = branch_bcp != nullptr ? method->bci_from(branch_bcp) : InvocationEntryBci;
1077
  const int bci = branch_bcp != nullptr ? method->bci_from(last_frame.bcp()) : InvocationEntryBci;
1078

1079
  nmethod* osr_nm = CompilationPolicy::event(method, method, branch_bci, bci, CompLevel_none, nullptr, CHECK_NULL);
1080

1081
  BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1082
  if (osr_nm != nullptr && bs_nm != nullptr) {
1083
    if (!bs_nm->nmethod_osr_entry_barrier(osr_nm)) {
1084
      osr_nm = nullptr;
1085
    }
1086
  }
1087
  return osr_nm;
1088
JRT_END
1089

1090
JRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))
1091
  assert(ProfileInterpreter, "must be profiling interpreter");
1092
  int bci = method->bci_from(cur_bcp);
1093
  MethodData* mdo = method->method_data();
1094
  if (mdo == nullptr)  return 0;
1095
  return mdo->bci_to_di(bci);
1096
JRT_END
1097

1098
#ifdef ASSERT
1099
JRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))
1100
  assert(ProfileInterpreter, "must be profiling interpreter");
1101

1102
  MethodData* mdo = method->method_data();
1103
  assert(mdo != nullptr, "must not be null");
1104

1105
  int bci = method->bci_from(bcp);
1106

1107
  address mdp2 = mdo->bci_to_dp(bci);
1108
  if (mdp != mdp2) {
1109
    ResourceMark rm;
1110
    tty->print_cr("FAILED verify : actual mdp %p   expected mdp %p @ bci %d", mdp, mdp2, bci);
1111
    int current_di = mdo->dp_to_di(mdp);
1112
    int expected_di  = mdo->dp_to_di(mdp2);
1113
    tty->print_cr("  actual di %d   expected di %d", current_di, expected_di);
1114
    int expected_approx_bci = mdo->data_at(expected_di)->bci();
1115
    int approx_bci = -1;
1116
    if (current_di >= 0) {
1117
      approx_bci = mdo->data_at(current_di)->bci();
1118
    }
1119
    tty->print_cr("  actual bci is %d  expected bci %d", approx_bci, expected_approx_bci);
1120
    mdo->print_on(tty);
1121
    method->print_codes();
1122
  }
1123
  assert(mdp == mdp2, "wrong mdp");
1124
JRT_END
1125
#endif // ASSERT
1126

1127
JRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* current, int return_bci))
1128
  assert(ProfileInterpreter, "must be profiling interpreter");
1129
  ResourceMark rm(current);
1130
  LastFrameAccessor last_frame(current);
1131
  assert(last_frame.is_interpreted_frame(), "must come from interpreter");
1132
  MethodData* h_mdo = last_frame.method()->method_data();
1133

1134
  // Grab a lock to ensure atomic access to setting the return bci and
1135
  // the displacement.  This can block and GC, invalidating all naked oops.
1136
  MutexLocker ml(RetData_lock);
1137

1138
  // ProfileData is essentially a wrapper around a derived oop, so we
1139
  // need to take the lock before making any ProfileData structures.
1140
  ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(last_frame.mdp()));
1141
  guarantee(data != nullptr, "profile data must be valid");
1142
  RetData* rdata = data->as_RetData();
1143
  address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
1144
  last_frame.set_mdp(new_mdp);
1145
JRT_END
1146

1147
JRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* current, Method* m))
1148
  return Method::build_method_counters(current, m);
1149
JRT_END
1150

1151

1152
JRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* current))
1153
  // We used to need an explicit preserve_arguments here for invoke bytecodes. However,
1154
  // stack traversal automatically takes care of preserving arguments for invoke, so
1155
  // this is no longer needed.
1156

1157
  // JRT_END does an implicit safepoint check, hence we are guaranteed to block
1158
  // if this is called during a safepoint
1159

1160
  if (JvmtiExport::should_post_single_step()) {
1161
    // This function is called by the interpreter when single stepping. Such single
1162
    // stepping could unwind a frame. Then, it is important that we process any frames
1163
    // that we might return into.
1164
    StackWatermarkSet::before_unwind(current);
1165

1166
    // We are called during regular safepoints and when the VM is
1167
    // single stepping. If any thread is marked for single stepping,
1168
    // then we may have JVMTI work to do.
1169
    LastFrameAccessor last_frame(current);
1170
    JvmtiExport::at_single_stepping_point(current, last_frame.method(), last_frame.bcp());
1171
  }
1172
JRT_END
1173

1174
JRT_LEAF(void, InterpreterRuntime::at_unwind(JavaThread* current))
1175
  assert(current == JavaThread::current(), "pre-condition");
1176
  // This function is called by the interpreter when the return poll found a reason
1177
  // to call the VM. The reason could be that we are returning into a not yet safe
1178
  // to access frame. We handle that below.
1179
  // Note that this path does not check for single stepping, because we do not want
1180
  // to single step when unwinding frames for an exception being thrown. Instead,
1181
  // such single stepping code will use the safepoint table, which will use the
1182
  // InterpreterRuntime::at_safepoint callback.
1183
  StackWatermarkSet::before_unwind(current);
1184
JRT_END
1185

1186
JRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread* current, oopDesc* obj,
1187
                                                      ResolvedFieldEntry *entry))
1188

1189
  // check the access_flags for the field in the klass
1190

1191
  InstanceKlass* ik = entry->field_holder();
1192
  int index = entry->field_index();
1193
  if (!ik->field_status(index).is_access_watched()) return;
1194

1195
  bool is_static = (obj == nullptr);
1196
  HandleMark hm(current);
1197

1198
  Handle h_obj;
1199
  if (!is_static) {
1200
    // non-static field accessors have an object, but we need a handle
1201
    h_obj = Handle(current, obj);
1202
  }
1203
  InstanceKlass* field_holder = entry->field_holder(); // HERE
1204
  jfieldID fid = jfieldIDWorkaround::to_jfieldID(field_holder, entry->field_offset(), is_static);
1205
  LastFrameAccessor last_frame(current);
1206
  JvmtiExport::post_field_access(current, last_frame.method(), last_frame.bcp(), field_holder, h_obj, fid);
1207
JRT_END
1208

1209
JRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread* current, oopDesc* obj,
1210
                                                            ResolvedFieldEntry *entry, jvalue *value))
1211

1212
  InstanceKlass* ik = entry->field_holder();
1213

1214
  // check the access_flags for the field in the klass
1215
  int index = entry->field_index();
1216
  // bail out if field modifications are not watched
1217
  if (!ik->field_status(index).is_modification_watched()) return;
1218

1219
  char sig_type = '\0';
1220

1221
  switch((TosState)entry->tos_state()) {
1222
    case btos: sig_type = JVM_SIGNATURE_BYTE;    break;
1223
    case ztos: sig_type = JVM_SIGNATURE_BOOLEAN; break;
1224
    case ctos: sig_type = JVM_SIGNATURE_CHAR;    break;
1225
    case stos: sig_type = JVM_SIGNATURE_SHORT;   break;
1226
    case itos: sig_type = JVM_SIGNATURE_INT;     break;
1227
    case ftos: sig_type = JVM_SIGNATURE_FLOAT;   break;
1228
    case atos: sig_type = JVM_SIGNATURE_CLASS;   break;
1229
    case ltos: sig_type = JVM_SIGNATURE_LONG;    break;
1230
    case dtos: sig_type = JVM_SIGNATURE_DOUBLE;  break;
1231
    default:  ShouldNotReachHere(); return;
1232
  }
1233
  bool is_static = (obj == nullptr);
1234

1235
  HandleMark hm(current);
1236
  jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, entry->field_offset(), is_static);
1237
  jvalue fvalue;
1238
#ifdef _LP64
1239
  fvalue = *value;
1240
#else
1241
  // Long/double values are stored unaligned and also noncontiguously with
1242
  // tagged stacks.  We can't just do a simple assignment even in the non-
1243
  // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1244
  // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1245
  // We assume that the two halves of longs/doubles are stored in interpreter
1246
  // stack slots in platform-endian order.
1247
  jlong_accessor u;
1248
  jint* newval = (jint*)value;
1249
  u.words[0] = newval[0];
1250
  u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
1251
  fvalue.j = u.long_value;
1252
#endif // _LP64
1253

1254
  Handle h_obj;
1255
  if (!is_static) {
1256
    // non-static field accessors have an object, but we need a handle
1257
    h_obj = Handle(current, obj);
1258
  }
1259

1260
  LastFrameAccessor last_frame(current);
1261
  JvmtiExport::post_raw_field_modification(current, last_frame.method(), last_frame.bcp(), ik, h_obj,
1262
                                           fid, sig_type, &fvalue);
1263
JRT_END
1264

1265
JRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread* current))
1266
  LastFrameAccessor last_frame(current);
1267
  JvmtiExport::post_method_entry(current, last_frame.method(), last_frame.get_frame());
1268
JRT_END
1269

1270

1271
// This is a JRT_BLOCK_ENTRY because we have to stash away the return oop
1272
// before transitioning to VM, and restore it after transitioning back
1273
// to Java. The return oop at the top-of-stack, is not walked by the GC.
1274
JRT_BLOCK_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread* current))
1275
  LastFrameAccessor last_frame(current);
1276
  JvmtiExport::post_method_exit(current, last_frame.method(), last_frame.get_frame());
1277
JRT_END
1278

1279
JRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1280
{
1281
  return (Interpreter::contains(Continuation::get_top_return_pc_post_barrier(JavaThread::current(), pc)) ? 1 : 0);
1282
}
1283
JRT_END
1284

1285

1286
// Implementation of SignatureHandlerLibrary
1287

1288
#ifndef SHARING_FAST_NATIVE_FINGERPRINTS
1289
// Dummy definition (else normalization method is defined in CPU
1290
// dependent code)
1291
uint64_t InterpreterRuntime::normalize_fast_native_fingerprint(uint64_t fingerprint) {
1292
  return fingerprint;
1293
}
1294
#endif
1295

1296
address SignatureHandlerLibrary::set_handler_blob() {
1297
  BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1298
  if (handler_blob == nullptr) {
1299
    return nullptr;
1300
  }
1301
  address handler = handler_blob->code_begin();
1302
  _handler_blob = handler_blob;
1303
  _handler = handler;
1304
  return handler;
1305
}
1306

1307
void SignatureHandlerLibrary::initialize() {
1308
  if (_fingerprints != nullptr) {
1309
    return;
1310
  }
1311
  if (set_handler_blob() == nullptr) {
1312
    vm_exit_out_of_memory(blob_size, OOM_MALLOC_ERROR, "native signature handlers");
1313
  }
1314

1315
  BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1316
                                      SignatureHandlerLibrary::buffer_size);
1317
  _buffer = bb->code_begin();
1318

1319
  _fingerprints = new (mtCode) GrowableArray<uint64_t>(32, mtCode);
1320
  _handlers     = new (mtCode) GrowableArray<address>(32, mtCode);
1321
}
1322

1323
address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1324
  address handler   = _handler;
1325
  int     insts_size = buffer->pure_insts_size();
1326
  if (handler + insts_size > _handler_blob->code_end()) {
1327
    // get a new handler blob
1328
    handler = set_handler_blob();
1329
  }
1330
  if (handler != nullptr) {
1331
    memcpy(handler, buffer->insts_begin(), insts_size);
1332
    pd_set_handler(handler);
1333
    ICache::invalidate_range(handler, insts_size);
1334
    _handler = handler + insts_size;
1335
  }
1336
  return handler;
1337
}
1338

1339
void SignatureHandlerLibrary::add(const methodHandle& method) {
1340
  if (method->signature_handler() == nullptr) {
1341
    // use slow signature handler if we can't do better
1342
    int handler_index = -1;
1343
    // check if we can use customized (fast) signature handler
1344
    if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::fp_max_size_of_parameters) {
1345
      // use customized signature handler
1346
      MutexLocker mu(SignatureHandlerLibrary_lock);
1347
      // make sure data structure is initialized
1348
      initialize();
1349
      // lookup method signature's fingerprint
1350
      uint64_t fingerprint = Fingerprinter(method).fingerprint();
1351
      // allow CPU dependent code to optimize the fingerprints for the fast handler
1352
      fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1353
      handler_index = _fingerprints->find(fingerprint);
1354
      // create handler if necessary
1355
      if (handler_index < 0) {
1356
        ResourceMark rm;
1357
        ptrdiff_t align_offset = align_up(_buffer, CodeEntryAlignment) - (address)_buffer;
1358
        CodeBuffer buffer((address)(_buffer + align_offset),
1359
                          checked_cast<int>(SignatureHandlerLibrary::buffer_size - align_offset));
1360
        InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1361
        // copy into code heap
1362
        address handler = set_handler(&buffer);
1363
        if (handler == nullptr) {
1364
          // use slow signature handler (without memorizing it in the fingerprints)
1365
        } else {
1366
          // debugging support
1367
          if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1368
            ttyLocker ttyl;
1369
            tty->cr();
1370
            tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1371
                          _handlers->length(),
1372
                          (method->is_static() ? "static" : "receiver"),
1373
                          method->name_and_sig_as_C_string(),
1374
                          fingerprint,
1375
                          buffer.insts_size());
1376
            if (buffer.insts_size() > 0) {
1377
              Disassembler::decode(handler, handler + buffer.insts_size(), tty
1378
                                   NOT_PRODUCT(COMMA &buffer.asm_remarks()));
1379
            }
1380
#ifndef PRODUCT
1381
            address rh_begin = Interpreter::result_handler(method()->result_type());
1382
            if (CodeCache::contains(rh_begin)) {
1383
              // else it might be special platform dependent values
1384
              tty->print_cr(" --- associated result handler ---");
1385
              address rh_end = rh_begin;
1386
              while (*(int*)rh_end != 0) {
1387
                rh_end += sizeof(int);
1388
              }
1389
              Disassembler::decode(rh_begin, rh_end);
1390
            } else {
1391
              tty->print_cr(" associated result handler: " PTR_FORMAT, p2i(rh_begin));
1392
            }
1393
#endif
1394
          }
1395
          // add handler to library
1396
          _fingerprints->append(fingerprint);
1397
          _handlers->append(handler);
1398
          // set handler index
1399
          assert(_fingerprints->length() == _handlers->length(), "sanity check");
1400
          handler_index = _fingerprints->length() - 1;
1401
        }
1402
      }
1403
      // Set handler under SignatureHandlerLibrary_lock
1404
      if (handler_index < 0) {
1405
        // use generic signature handler
1406
        method->set_signature_handler(Interpreter::slow_signature_handler());
1407
      } else {
1408
        // set handler
1409
        method->set_signature_handler(_handlers->at(handler_index));
1410
      }
1411
    } else {
1412
      DEBUG_ONLY(JavaThread::current()->check_possible_safepoint());
1413
      // use generic signature handler
1414
      method->set_signature_handler(Interpreter::slow_signature_handler());
1415
    }
1416
  }
1417
#ifdef ASSERT
1418
  int handler_index = -1;
1419
  int fingerprint_index = -2;
1420
  {
1421
    // '_handlers' and '_fingerprints' are 'GrowableArray's and are NOT synchronized
1422
    // in any way if accessed from multiple threads. To avoid races with another
1423
    // thread which may change the arrays in the above, mutex protected block, we
1424
    // have to protect this read access here with the same mutex as well!
1425
    MutexLocker mu(SignatureHandlerLibrary_lock);
1426
    if (_handlers != nullptr) {
1427
      handler_index = _handlers->find(method->signature_handler());
1428
      uint64_t fingerprint = Fingerprinter(method).fingerprint();
1429
      fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1430
      fingerprint_index = _fingerprints->find(fingerprint);
1431
    }
1432
  }
1433
  assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1434
         handler_index == fingerprint_index, "sanity check");
1435
#endif // ASSERT
1436
}
1437

1438
void SignatureHandlerLibrary::add(uint64_t fingerprint, address handler) {
1439
  int handler_index = -1;
1440
  // use customized signature handler
1441
  MutexLocker mu(SignatureHandlerLibrary_lock);
1442
  // make sure data structure is initialized
1443
  initialize();
1444
  fingerprint = InterpreterRuntime::normalize_fast_native_fingerprint(fingerprint);
1445
  handler_index = _fingerprints->find(fingerprint);
1446
  // create handler if necessary
1447
  if (handler_index < 0) {
1448
    if (PrintSignatureHandlers && (handler != Interpreter::slow_signature_handler())) {
1449
      tty->cr();
1450
      tty->print_cr("argument handler #%d at " PTR_FORMAT " for fingerprint " UINT64_FORMAT,
1451
                    _handlers->length(),
1452
                    p2i(handler),
1453
                    fingerprint);
1454
    }
1455
    _fingerprints->append(fingerprint);
1456
    _handlers->append(handler);
1457
  } else {
1458
    if (PrintSignatureHandlers) {
1459
      tty->cr();
1460
      tty->print_cr("duplicate argument handler #%d for fingerprint " UINT64_FORMAT "(old: " PTR_FORMAT ", new : " PTR_FORMAT ")",
1461
                    _handlers->length(),
1462
                    fingerprint,
1463
                    p2i(_handlers->at(handler_index)),
1464
                    p2i(handler));
1465
    }
1466
  }
1467
}
1468

1469

1470
BufferBlob*              SignatureHandlerLibrary::_handler_blob = nullptr;
1471
address                  SignatureHandlerLibrary::_handler      = nullptr;
1472
GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = nullptr;
1473
GrowableArray<address>*  SignatureHandlerLibrary::_handlers     = nullptr;
1474
address                  SignatureHandlerLibrary::_buffer       = nullptr;
1475

1476

1477
JRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* current, Method* method))
1478
  methodHandle m(current, method);
1479
  assert(m->is_native(), "sanity check");
1480
  // lookup native function entry point if it doesn't exist
1481
  if (!m->has_native_function()) {
1482
    NativeLookup::lookup(m, CHECK);
1483
  }
1484
  // make sure signature handler is installed
1485
  SignatureHandlerLibrary::add(m);
1486
  // The interpreter entry point checks the signature handler first,
1487
  // before trying to fetch the native entry point and klass mirror.
1488
  // We must set the signature handler last, so that multiple processors
1489
  // preparing the same method will be sure to see non-null entry & mirror.
1490
JRT_END
1491

1492
#if defined(IA32) || defined(AMD64) || defined(ARM)
1493
JRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* current, void* src_address, void* dest_address))
1494
  assert(current == JavaThread::current(), "pre-condition");
1495
  if (src_address == dest_address) {
1496
    return;
1497
  }
1498
  ResourceMark rm;
1499
  LastFrameAccessor last_frame(current);
1500
  assert(last_frame.is_interpreted_frame(), "");
1501
  jint bci = last_frame.bci();
1502
  methodHandle mh(current, last_frame.method());
1503
  Bytecode_invoke invoke(mh, bci);
1504
  ArgumentSizeComputer asc(invoke.signature());
1505
  int size_of_arguments = (asc.size() + (invoke.has_receiver() ? 1 : 0)); // receiver
1506
  Copy::conjoint_jbytes(src_address, dest_address,
1507
                       size_of_arguments * Interpreter::stackElementSize);
1508
JRT_END
1509
#endif
1510

1511
#if INCLUDE_JVMTI
1512
// This is a support of the JVMTI PopFrame interface.
1513
// Make sure it is an invokestatic of a polymorphic intrinsic that has a member_name argument
1514
// and return it as a vm_result so that it can be reloaded in the list of invokestatic parameters.
1515
// The member_name argument is a saved reference (in local#0) to the member_name.
1516
// For backward compatibility with some JDK versions (7, 8) it can also be a direct method handle.
1517
// FIXME: remove DMH case after j.l.i.InvokerBytecodeGenerator code shape is updated.
1518
JRT_ENTRY(void, InterpreterRuntime::member_name_arg_or_null(JavaThread* current, address member_name,
1519
                                                            Method* method, address bcp))
1520
  Bytecodes::Code code = Bytecodes::code_at(method, bcp);
1521
  if (code != Bytecodes::_invokestatic) {
1522
    return;
1523
  }
1524
  ConstantPool* cpool = method->constants();
1525
  int cp_index = Bytes::get_native_u2(bcp + 1);
1526
  Symbol* cname = cpool->klass_name_at(cpool->klass_ref_index_at(cp_index, code));
1527
  Symbol* mname = cpool->name_ref_at(cp_index, code);
1528

1529
  if (MethodHandles::has_member_arg(cname, mname)) {
1530
    oop member_name_oop = cast_to_oop(member_name);
1531
    if (java_lang_invoke_DirectMethodHandle::is_instance(member_name_oop)) {
1532
      // FIXME: remove after j.l.i.InvokerBytecodeGenerator code shape is updated.
1533
      member_name_oop = java_lang_invoke_DirectMethodHandle::member(member_name_oop);
1534
    }
1535
    current->set_vm_result(member_name_oop);
1536
  } else {
1537
    current->set_vm_result(nullptr);
1538
  }
1539
JRT_END
1540
#endif // INCLUDE_JVMTI
1541

1542
#ifndef PRODUCT
1543
// This must be a JRT_LEAF function because the interpreter must save registers on x86 to
1544
// call this, which changes rsp and makes the interpreter's expression stack not walkable.
1545
// The generated code still uses call_VM because that will set up the frame pointer for
1546
// bcp and method.
1547
JRT_LEAF(intptr_t, InterpreterRuntime::trace_bytecode(JavaThread* current, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
1548
  assert(current == JavaThread::current(), "pre-condition");
1549
  LastFrameAccessor last_frame(current);
1550
  assert(last_frame.is_interpreted_frame(), "must be an interpreted frame");
1551
  methodHandle mh(current, last_frame.method());
1552
  BytecodeTracer::trace_interpreter(mh, last_frame.bcp(), tos, tos2);
1553
  return preserve_this_value;
1554
JRT_END
1555
#endif // !PRODUCT
1556