C++ methodOop::max_stack方法代码示例

int MethodComparator::check_stack_and_locals_size(methodOop old_method, methodOop new_method) {
  if (old_method->max_stack() != new_method->max_stack()) {
    return 1;
  } else if (old_method->max_locals() != new_method->max_locals()) {
    return 2;
  } else if (old_method->size_of_parameters() != new_method->size_of_parameters()) {
    return 3;
  } else return 0;
}

void BytecodeInterpreter::layout_interpreterState(interpreterState istate,
                                                  frame*    caller,
                                                  frame*    current,
                                                  methodOop method,
                                                  intptr_t* locals,
                                                  intptr_t* stack,
                                                  intptr_t* stack_base,
                                                  intptr_t* monitor_base,
                                                  intptr_t* frame_bottom,
                                                  bool      is_top_frame) {
  istate->set_locals(locals);
  istate->set_method(method);
  istate->set_self_link(istate);
  istate->set_prev_link(NULL);
  // thread will be set by a hacky repurposing of frame::patch_pc()
  // bcp will be set by vframeArrayElement::unpack_on_stack()
  istate->set_constants(method->constants()->cache());
  istate->set_msg(BytecodeInterpreter::method_resume);
  istate->set_bcp_advance(0);
  istate->set_oop_temp(NULL);
  istate->set_mdx(NULL);
  if (caller->is_interpreted_frame()) {
    interpreterState prev = caller->get_interpreterState();
    prev->set_callee(method);
    if (*prev->bcp() == Bytecodes::_invokeinterface)
      prev->set_bcp_advance(5);
    else
      prev->set_bcp_advance(3);
  }
  istate->set_callee(NULL);
  istate->set_monitor_base((BasicObjectLock *) monitor_base);
  istate->set_stack_base(stack_base);
  istate->set_stack(stack);
  istate->set_stack_limit(stack_base - method->max_stack() - 1);
}

 // for hashing into the table
 static int hash(methodOop method) {
     // The point here is to try to make something fairly unique
     // out of the fields we can read without grabbing any locks
     // since the method may be locked when we need the hash.
     return (
         method->code_size() ^
         method->max_stack() ^
         method->max_locals() ^
         method->size_of_parameters());
 }

int AbstractInterpreter::layout_activation(methodOop method,
                                           int       tempcount,
                                           int       popframe_extra_args,
                                           int       moncount,
                                           int       caller_actual_parameters,
                                           int       callee_param_count,
                                           int       callee_locals,
                                           frame*    caller,
                                           frame*    interpreter_frame,
                                           bool      is_top_frame,
                                           bool      is_bottom_frame) {
  assert(popframe_extra_args == 0, "what to do?");
  assert(!is_top_frame || (!callee_locals && !callee_param_count),
         "top frame should have no caller");

  // This code must exactly match what InterpreterFrame::build
  // does (the full InterpreterFrame::build, that is, not the
  // one that creates empty frames for the deoptimizer).
  //
  // If interpreter_frame is not NULL then it will be filled in.
  // It's size is determined by a previous call to this method,
  // so it should be correct.
  //
  // Note that tempcount is the current size of the expression
  // stack.  For top most frames we will allocate a full sized
  // expression stack and not the trimmed version that non-top
  // frames have.

  int header_words        = InterpreterFrame::header_words;
  int monitor_words       = moncount * frame::interpreter_frame_monitor_size();
  int stack_words         = is_top_frame ? method->max_stack() : tempcount;
  int callee_extra_locals = callee_locals - callee_param_count;

  if (interpreter_frame) {
    intptr_t *locals        = interpreter_frame->fp() + method->max_locals();
    interpreterState istate = interpreter_frame->get_interpreterState();
    intptr_t *monitor_base  = (intptr_t*) istate;
    intptr_t *stack_base    = monitor_base - monitor_words;
    intptr_t *stack         = stack_base - tempcount - 1;

    BytecodeInterpreter::layout_interpreterState(istate,
                                                 caller,
                                                 NULL,
                                                 method,
                                                 locals,
                                                 stack,
                                                 stack_base,
                                                 monitor_base,
                                                 NULL,
                                                 is_top_frame);
  }
  return header_words + monitor_words + stack_words + callee_extra_locals;
}

int AbstractInterpreter::size_top_interpreter_activation(methodOop method)
{
#ifdef PPC
  StackFrame frame;

  int call_stub_frame = round_to(
    StubRoutines::call_stub_base_size() +
    method->max_locals() * wordSize, StackAlignmentInBytes);

  int interpreter_frame = round_to(
    frame.unaligned_size() +
    slop_factor + 
    method->max_stack() * wordSize +
    (method->is_synchronized() ?
     frame::interpreter_frame_monitor_size() * wordSize : 0) +
    sizeof(BytecodeInterpreter), StackAlignmentInBytes);

  return (call_stub_frame + interpreter_frame) / wordSize;
#else
  Unimplemented();
#endif // PPC
}