view src/share/vm/interpreter/templateInterpreter.cpp @ 2488:e1162778c1c8

7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error Summary: A referent object that is only weakly reachable at the start of concurrent marking but is re-attached to the strongly reachable object graph during marking may not be marked as live. This can cause the reference object to be processed prematurely and leave dangling pointers to the referent object. Implement a read barrier for the java.lang.ref.Reference::referent field by intrinsifying the Reference.get() method, and intercepting accesses though JNI, reflection, and Unsafe, so that when a non-null referent object is read it is also logged in an SATB buffer. Reviewed-by: kvn, iveresov, never, tonyp, dholmes
author johnc
date Thu, 07 Apr 2011 09:53:20 -0700
parents 8012aa3ccede
children 38fa55e5e792
line wrap: on
line source
/*
 * Copyright (c) 1997, 2011, 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
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#include "precompiled.hpp"
#include "interpreter/interpreter.hpp"
#include "interpreter/interpreterGenerator.hpp"
#include "interpreter/interpreterRuntime.hpp"
#include "interpreter/templateTable.hpp"

#ifndef CC_INTERP

# define __ _masm->

void TemplateInterpreter::initialize() {
  if (_code != NULL) return;
  // assertions
  assert((int)Bytecodes::number_of_codes <= (int)DispatchTable::length,
         "dispatch table too small");

  AbstractInterpreter::initialize();

  TemplateTable::initialize();

  // generate interpreter
  { ResourceMark rm;
    TraceTime timer("Interpreter generation", TraceStartupTime);
    int code_size = InterpreterCodeSize;
    NOT_PRODUCT(code_size *= 4;)  // debug uses extra interpreter code space
    _code = new StubQueue(new InterpreterCodeletInterface, code_size, NULL,
                          "Interpreter");
    InterpreterGenerator g(_code);
    if (PrintInterpreter) print();
  }

  // initialize dispatch table
  _active_table = _normal_table;
}

//------------------------------------------------------------------------------------------------------------------------
// Implementation of EntryPoint

EntryPoint::EntryPoint() {
  assert(number_of_states == 9, "check the code below");
  _entry[btos] = NULL;
  _entry[ctos] = NULL;
  _entry[stos] = NULL;
  _entry[atos] = NULL;
  _entry[itos] = NULL;
  _entry[ltos] = NULL;
  _entry[ftos] = NULL;
  _entry[dtos] = NULL;
  _entry[vtos] = NULL;
}


EntryPoint::EntryPoint(address bentry, address centry, address sentry, address aentry, address ientry, address lentry, address fentry, address dentry, address ventry) {
  assert(number_of_states == 9, "check the code below");
  _entry[btos] = bentry;
  _entry[ctos] = centry;
  _entry[stos] = sentry;
  _entry[atos] = aentry;
  _entry[itos] = ientry;
  _entry[ltos] = lentry;
  _entry[ftos] = fentry;
  _entry[dtos] = dentry;
  _entry[vtos] = ventry;
}


void EntryPoint::set_entry(TosState state, address entry) {
  assert(0 <= state && state < number_of_states, "state out of bounds");
  _entry[state] = entry;
}


address EntryPoint::entry(TosState state) const {
  assert(0 <= state && state < number_of_states, "state out of bounds");
  return _entry[state];
}


void EntryPoint::print() {
  tty->print("[");
  for (int i = 0; i < number_of_states; i++) {
    if (i > 0) tty->print(", ");
    tty->print(INTPTR_FORMAT, _entry[i]);
  }
  tty->print("]");
}


bool EntryPoint::operator == (const EntryPoint& y) {
  int i = number_of_states;
  while (i-- > 0) {
    if (_entry[i] != y._entry[i]) return false;
  }
  return true;
}


//------------------------------------------------------------------------------------------------------------------------
// Implementation of DispatchTable

EntryPoint DispatchTable::entry(int i) const {
  assert(0 <= i && i < length, "index out of bounds");
  return
    EntryPoint(
      _table[btos][i],
      _table[ctos][i],
      _table[stos][i],
      _table[atos][i],
      _table[itos][i],
      _table[ltos][i],
      _table[ftos][i],
      _table[dtos][i],
      _table[vtos][i]
    );
}


void DispatchTable::set_entry(int i, EntryPoint& entry) {
  assert(0 <= i && i < length, "index out of bounds");
  assert(number_of_states == 9, "check the code below");
  _table[btos][i] = entry.entry(btos);
  _table[ctos][i] = entry.entry(ctos);
  _table[stos][i] = entry.entry(stos);
  _table[atos][i] = entry.entry(atos);
  _table[itos][i] = entry.entry(itos);
  _table[ltos][i] = entry.entry(ltos);
  _table[ftos][i] = entry.entry(ftos);
  _table[dtos][i] = entry.entry(dtos);
  _table[vtos][i] = entry.entry(vtos);
}


bool DispatchTable::operator == (DispatchTable& y) {
  int i = length;
  while (i-- > 0) {
    EntryPoint t = y.entry(i); // for compiler compatibility (BugId 4150096)
    if (!(entry(i) == t)) return false;
  }
  return true;
}

address    TemplateInterpreter::_remove_activation_entry                    = NULL;
address    TemplateInterpreter::_remove_activation_preserving_args_entry    = NULL;


address    TemplateInterpreter::_throw_ArrayIndexOutOfBoundsException_entry = NULL;
address    TemplateInterpreter::_throw_ArrayStoreException_entry            = NULL;
address    TemplateInterpreter::_throw_ArithmeticException_entry            = NULL;
address    TemplateInterpreter::_throw_ClassCastException_entry             = NULL;
address    TemplateInterpreter::_throw_WrongMethodType_entry                = NULL;
address    TemplateInterpreter::_throw_NullPointerException_entry           = NULL;
address    TemplateInterpreter::_throw_StackOverflowError_entry             = NULL;
address    TemplateInterpreter::_throw_exception_entry                      = NULL;

#ifndef PRODUCT
EntryPoint TemplateInterpreter::_trace_code;
#endif // !PRODUCT
EntryPoint TemplateInterpreter::_return_entry[TemplateInterpreter::number_of_return_entries];
EntryPoint TemplateInterpreter::_earlyret_entry;
EntryPoint TemplateInterpreter::_deopt_entry [TemplateInterpreter::number_of_deopt_entries ];
EntryPoint TemplateInterpreter::_continuation_entry;
EntryPoint TemplateInterpreter::_safept_entry;

address    TemplateInterpreter::_return_3_addrs_by_index[TemplateInterpreter::number_of_return_addrs];
address    TemplateInterpreter::_return_5_addrs_by_index[TemplateInterpreter::number_of_return_addrs];

DispatchTable TemplateInterpreter::_active_table;
DispatchTable TemplateInterpreter::_normal_table;
DispatchTable TemplateInterpreter::_safept_table;
address    TemplateInterpreter::_wentry_point[DispatchTable::length];

TemplateInterpreterGenerator::TemplateInterpreterGenerator(StubQueue* _code): AbstractInterpreterGenerator(_code) {
  _unimplemented_bytecode    = NULL;
  _illegal_bytecode_sequence = NULL;
}

static const BasicType types[Interpreter::number_of_result_handlers] = {
  T_BOOLEAN,
  T_CHAR   ,
  T_BYTE   ,
  T_SHORT  ,
  T_INT    ,
  T_LONG   ,
  T_VOID   ,
  T_FLOAT  ,
  T_DOUBLE ,
  T_OBJECT
};

void TemplateInterpreterGenerator::generate_all() {
  AbstractInterpreterGenerator::generate_all();

  { CodeletMark cm(_masm, "error exits");
    _unimplemented_bytecode    = generate_error_exit("unimplemented bytecode");
    _illegal_bytecode_sequence = generate_error_exit("illegal bytecode sequence - method not verified");
  }

#ifndef PRODUCT
  if (TraceBytecodes) {
    CodeletMark cm(_masm, "bytecode tracing support");
    Interpreter::_trace_code =
      EntryPoint(
        generate_trace_code(btos),
        generate_trace_code(ctos),
        generate_trace_code(stos),
        generate_trace_code(atos),
        generate_trace_code(itos),
        generate_trace_code(ltos),
        generate_trace_code(ftos),
        generate_trace_code(dtos),
        generate_trace_code(vtos)
      );
  }
#endif // !PRODUCT

  { CodeletMark cm(_masm, "return entry points");
    for (int i = 0; i < Interpreter::number_of_return_entries; i++) {
      Interpreter::_return_entry[i] =
        EntryPoint(
          generate_return_entry_for(itos, i),
          generate_return_entry_for(itos, i),
          generate_return_entry_for(itos, i),
          generate_return_entry_for(atos, i),
          generate_return_entry_for(itos, i),
          generate_return_entry_for(ltos, i),
          generate_return_entry_for(ftos, i),
          generate_return_entry_for(dtos, i),
          generate_return_entry_for(vtos, i)
        );
    }
  }

  { CodeletMark cm(_masm, "earlyret entry points");
    Interpreter::_earlyret_entry =
      EntryPoint(
        generate_earlyret_entry_for(btos),
        generate_earlyret_entry_for(ctos),
        generate_earlyret_entry_for(stos),
        generate_earlyret_entry_for(atos),
        generate_earlyret_entry_for(itos),
        generate_earlyret_entry_for(ltos),
        generate_earlyret_entry_for(ftos),
        generate_earlyret_entry_for(dtos),
        generate_earlyret_entry_for(vtos)
      );
  }

  { CodeletMark cm(_masm, "deoptimization entry points");
    for (int i = 0; i < Interpreter::number_of_deopt_entries; i++) {
      Interpreter::_deopt_entry[i] =
        EntryPoint(
          generate_deopt_entry_for(itos, i),
          generate_deopt_entry_for(itos, i),
          generate_deopt_entry_for(itos, i),
          generate_deopt_entry_for(atos, i),
          generate_deopt_entry_for(itos, i),
          generate_deopt_entry_for(ltos, i),
          generate_deopt_entry_for(ftos, i),
          generate_deopt_entry_for(dtos, i),
          generate_deopt_entry_for(vtos, i)
        );
    }
  }

  { CodeletMark cm(_masm, "result handlers for native calls");
    // The various result converter stublets.
    int is_generated[Interpreter::number_of_result_handlers];
    memset(is_generated, 0, sizeof(is_generated));

    for (int i = 0; i < Interpreter::number_of_result_handlers; i++) {
      BasicType type = types[i];
      if (!is_generated[Interpreter::BasicType_as_index(type)]++) {
        Interpreter::_native_abi_to_tosca[Interpreter::BasicType_as_index(type)] = generate_result_handler_for(type);
      }
    }
  }

  for (int j = 0; j < number_of_states; j++) {
    const TosState states[] = {btos, ctos, stos, itos, ltos, ftos, dtos, atos, vtos};
    int index = Interpreter::TosState_as_index(states[j]);
    Interpreter::_return_3_addrs_by_index[index] = Interpreter::return_entry(states[j], 3);
    Interpreter::_return_5_addrs_by_index[index] = Interpreter::return_entry(states[j], 5);
  }

  { CodeletMark cm(_masm, "continuation entry points");
    Interpreter::_continuation_entry =
      EntryPoint(
        generate_continuation_for(btos),
        generate_continuation_for(ctos),
        generate_continuation_for(stos),
        generate_continuation_for(atos),
        generate_continuation_for(itos),
        generate_continuation_for(ltos),
        generate_continuation_for(ftos),
        generate_continuation_for(dtos),
        generate_continuation_for(vtos)
      );
  }

  { CodeletMark cm(_masm, "safepoint entry points");
    Interpreter::_safept_entry =
      EntryPoint(
        generate_safept_entry_for(btos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
        generate_safept_entry_for(ctos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
        generate_safept_entry_for(stos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
        generate_safept_entry_for(atos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
        generate_safept_entry_for(itos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
        generate_safept_entry_for(ltos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
        generate_safept_entry_for(ftos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
        generate_safept_entry_for(dtos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint)),
        generate_safept_entry_for(vtos, CAST_FROM_FN_PTR(address, InterpreterRuntime::at_safepoint))
      );
  }

  { CodeletMark cm(_masm, "exception handling");
    // (Note: this is not safepoint safe because thread may return to compiled code)
    generate_throw_exception();
  }

  { CodeletMark cm(_masm, "throw exception entrypoints");
    Interpreter::_throw_ArrayIndexOutOfBoundsException_entry = generate_ArrayIndexOutOfBounds_handler("java/lang/ArrayIndexOutOfBoundsException");
    Interpreter::_throw_ArrayStoreException_entry            = generate_klass_exception_handler("java/lang/ArrayStoreException"                 );
    Interpreter::_throw_ArithmeticException_entry            = generate_exception_handler("java/lang/ArithmeticException"           , "/ by zero");
    Interpreter::_throw_ClassCastException_entry             = generate_ClassCastException_handler();
    Interpreter::_throw_WrongMethodType_entry                = generate_WrongMethodType_handler();
    Interpreter::_throw_NullPointerException_entry           = generate_exception_handler("java/lang/NullPointerException"          , NULL       );
    Interpreter::_throw_StackOverflowError_entry             = generate_StackOverflowError_handler();
  }



#define method_entry(kind)                                                                    \
  { CodeletMark cm(_masm, "method entry point (kind = " #kind ")");                    \
    Interpreter::_entry_table[Interpreter::kind] = generate_method_entry(Interpreter::kind);  \
  }

  // all non-native method kinds
  method_entry(zerolocals)
  method_entry(zerolocals_synchronized)
  method_entry(empty)
  method_entry(accessor)
  method_entry(abstract)
  method_entry(method_handle)
  method_entry(java_lang_math_sin  )
  method_entry(java_lang_math_cos  )
  method_entry(java_lang_math_tan  )
  method_entry(java_lang_math_abs  )
  method_entry(java_lang_math_sqrt )
  method_entry(java_lang_math_log  )
  method_entry(java_lang_math_log10)
  method_entry(java_lang_ref_reference_get)

  // all native method kinds (must be one contiguous block)
  Interpreter::_native_entry_begin = Interpreter::code()->code_end();
  method_entry(native)
  method_entry(native_synchronized)
  Interpreter::_native_entry_end = Interpreter::code()->code_end();

#undef method_entry

  // Bytecodes
  set_entry_points_for_all_bytes();
  set_safepoints_for_all_bytes();
}

//------------------------------------------------------------------------------------------------------------------------

address TemplateInterpreterGenerator::generate_error_exit(const char* msg) {
  address entry = __ pc();
  __ stop(msg);
  return entry;
}


//------------------------------------------------------------------------------------------------------------------------

void TemplateInterpreterGenerator::set_entry_points_for_all_bytes() {
  for (int i = 0; i < DispatchTable::length; i++) {
    Bytecodes::Code code = (Bytecodes::Code)i;
    if (Bytecodes::is_defined(code)) {
      set_entry_points(code);
    } else {
      set_unimplemented(i);
    }
  }
}


void TemplateInterpreterGenerator::set_safepoints_for_all_bytes() {
  for (int i = 0; i < DispatchTable::length; i++) {
    Bytecodes::Code code = (Bytecodes::Code)i;
    if (Bytecodes::is_defined(code)) Interpreter::_safept_table.set_entry(code, Interpreter::_safept_entry);
  }
}


void TemplateInterpreterGenerator::set_unimplemented(int i) {
  address e = _unimplemented_bytecode;
  EntryPoint entry(e, e, e, e, e, e, e, e, e);
  Interpreter::_normal_table.set_entry(i, entry);
  Interpreter::_wentry_point[i] = _unimplemented_bytecode;
}


void TemplateInterpreterGenerator::set_entry_points(Bytecodes::Code code) {
  CodeletMark cm(_masm, Bytecodes::name(code), code);
  // initialize entry points
  assert(_unimplemented_bytecode    != NULL, "should have been generated before");
  assert(_illegal_bytecode_sequence != NULL, "should have been generated before");
  address bep = _illegal_bytecode_sequence;
  address cep = _illegal_bytecode_sequence;
  address sep = _illegal_bytecode_sequence;
  address aep = _illegal_bytecode_sequence;
  address iep = _illegal_bytecode_sequence;
  address lep = _illegal_bytecode_sequence;
  address fep = _illegal_bytecode_sequence;
  address dep = _illegal_bytecode_sequence;
  address vep = _unimplemented_bytecode;
  address wep = _unimplemented_bytecode;
  // code for short & wide version of bytecode
  if (Bytecodes::is_defined(code)) {
    Template* t = TemplateTable::template_for(code);
    assert(t->is_valid(), "just checking");
    set_short_entry_points(t, bep, cep, sep, aep, iep, lep, fep, dep, vep);
  }
  if (Bytecodes::wide_is_defined(code)) {
    Template* t = TemplateTable::template_for_wide(code);
    assert(t->is_valid(), "just checking");
    set_wide_entry_point(t, wep);
  }
  // set entry points
  EntryPoint entry(bep, cep, sep, aep, iep, lep, fep, dep, vep);
  Interpreter::_normal_table.set_entry(code, entry);
  Interpreter::_wentry_point[code] = wep;
}


void TemplateInterpreterGenerator::set_wide_entry_point(Template* t, address& wep) {
  assert(t->is_valid(), "template must exist");
  assert(t->tos_in() == vtos, "only vtos tos_in supported for wide instructions");
  wep = __ pc(); generate_and_dispatch(t);
}


void TemplateInterpreterGenerator::set_short_entry_points(Template* t, address& bep, address& cep, address& sep, address& aep, address& iep, address& lep, address& fep, address& dep, address& vep) {
  assert(t->is_valid(), "template must exist");
  switch (t->tos_in()) {
    case btos:
    case ctos:
    case stos:
      ShouldNotReachHere();  // btos/ctos/stos should use itos.
      break;
    case atos: vep = __ pc(); __ pop(atos); aep = __ pc(); generate_and_dispatch(t); break;
    case itos: vep = __ pc(); __ pop(itos); iep = __ pc(); generate_and_dispatch(t); break;
    case ltos: vep = __ pc(); __ pop(ltos); lep = __ pc(); generate_and_dispatch(t); break;
    case ftos: vep = __ pc(); __ pop(ftos); fep = __ pc(); generate_and_dispatch(t); break;
    case dtos: vep = __ pc(); __ pop(dtos); dep = __ pc(); generate_and_dispatch(t); break;
    case vtos: set_vtos_entry_points(t, bep, cep, sep, aep, iep, lep, fep, dep, vep);     break;
    default  : ShouldNotReachHere();                                                 break;
  }
}


//------------------------------------------------------------------------------------------------------------------------

void TemplateInterpreterGenerator::generate_and_dispatch(Template* t, TosState tos_out) {
  if (PrintBytecodeHistogram)                                    histogram_bytecode(t);
#ifndef PRODUCT
  // debugging code
  if (CountBytecodes || TraceBytecodes || StopInterpreterAt > 0) count_bytecode();
  if (PrintBytecodePairHistogram)                                histogram_bytecode_pair(t);
  if (TraceBytecodes)                                            trace_bytecode(t);
  if (StopInterpreterAt > 0)                                     stop_interpreter_at();
  __ verify_FPU(1, t->tos_in());
#endif // !PRODUCT
  int step;
  if (!t->does_dispatch()) {
    step = t->is_wide() ? Bytecodes::wide_length_for(t->bytecode()) : Bytecodes::length_for(t->bytecode());
    if (tos_out == ilgl) tos_out = t->tos_out();
    // compute bytecode size
    assert(step > 0, "just checkin'");
    // setup stuff for dispatching next bytecode
    if (ProfileInterpreter && VerifyDataPointer
        && methodDataOopDesc::bytecode_has_profile(t->bytecode())) {
      __ verify_method_data_pointer();
    }
    __ dispatch_prolog(tos_out, step);
  }
  // generate template
  t->generate(_masm);
  // advance
  if (t->does_dispatch()) {
#ifdef ASSERT
    // make sure execution doesn't go beyond this point if code is broken
    __ should_not_reach_here();
#endif // ASSERT
  } else {
    // dispatch to next bytecode
    __ dispatch_epilog(tos_out, step);
  }
}

//------------------------------------------------------------------------------------------------------------------------
// Entry points

address TemplateInterpreter::return_entry(TosState state, int length) {
  guarantee(0 <= length && length < Interpreter::number_of_return_entries, "illegal length");
  return _return_entry[length].entry(state);
}


address TemplateInterpreter::deopt_entry(TosState state, int length) {
  guarantee(0 <= length && length < Interpreter::number_of_deopt_entries, "illegal length");
  return _deopt_entry[length].entry(state);
}

//------------------------------------------------------------------------------------------------------------------------
// Suport for invokes

int TemplateInterpreter::TosState_as_index(TosState state) {
  assert( state < number_of_states , "Invalid state in TosState_as_index");
  assert(0 <= (int)state && (int)state < TemplateInterpreter::number_of_return_addrs, "index out of bounds");
  return (int)state;
}


//------------------------------------------------------------------------------------------------------------------------
// Safepoint suppport

static inline void copy_table(address* from, address* to, int size) {
  // Copy non-overlapping tables. The copy has to occur word wise for MT safety.
  while (size-- > 0) *to++ = *from++;
}

void TemplateInterpreter::notice_safepoints() {
  if (!_notice_safepoints) {
    // switch to safepoint dispatch table
    _notice_safepoints = true;
    copy_table((address*)&_safept_table, (address*)&_active_table, sizeof(_active_table) / sizeof(address));
  }
}

// switch from the dispatch table which notices safepoints back to the
// normal dispatch table.  So that we can notice single stepping points,
// keep the safepoint dispatch table if we are single stepping in JVMTI.
// Note that the should_post_single_step test is exactly as fast as the
// JvmtiExport::_enabled test and covers both cases.
void TemplateInterpreter::ignore_safepoints() {
  if (_notice_safepoints) {
    if (!JvmtiExport::should_post_single_step()) {
      // switch to normal dispatch table
      _notice_safepoints = false;
      copy_table((address*)&_normal_table, (address*)&_active_table, sizeof(_active_table) / sizeof(address));
    }
  }
}

//------------------------------------------------------------------------------------------------------------------------
// Deoptimization support

// If deoptimization happens, this function returns the point of next bytecode to continue execution
address TemplateInterpreter::deopt_continue_after_entry(methodOop method, address bcp, int callee_parameters, bool is_top_frame) {
  return AbstractInterpreter::deopt_continue_after_entry(method, bcp, callee_parameters, is_top_frame);
}

// If deoptimization happens, this function returns the point where the interpreter reexecutes
// the bytecode.
// Note: Bytecodes::_athrow (C1 only) and Bytecodes::_return are the special cases
//       that do not return "Interpreter::deopt_entry(vtos, 0)"
address TemplateInterpreter::deopt_reexecute_entry(methodOop method, address bcp) {
  assert(method->contains(bcp), "just checkin'");
  Bytecodes::Code code   = Bytecodes::java_code_at(method, bcp);
  if (code == Bytecodes::_return) {
    // This is used for deopt during registration of finalizers
    // during Object.<init>.  We simply need to resume execution at
    // the standard return vtos bytecode to pop the frame normally.
    // reexecuting the real bytecode would cause double registration
    // of the finalizable object.
    return _normal_table.entry(Bytecodes::_return).entry(vtos);
  } else {
    return AbstractInterpreter::deopt_reexecute_entry(method, bcp);
  }
}

// If deoptimization happens, the interpreter should reexecute this bytecode.
// This function mainly helps the compilers to set up the reexecute bit.
bool TemplateInterpreter::bytecode_should_reexecute(Bytecodes::Code code) {
  if (code == Bytecodes::_return) {
    //Yes, we consider Bytecodes::_return as a special case of reexecution
    return true;
  } else {
    return AbstractInterpreter::bytecode_should_reexecute(code);
  }
}

#endif // !CC_INTERP