Ejemplo n.º 1
0
int CppInterpreter::native_entry(methodOop method, intptr_t UNUSED, TRAPS) {
  // Make sure method is native and not abstract
  assert(method->is_native() && !method->is_abstract(), "should be");

  JavaThread *thread = (JavaThread *) THREAD;
  ZeroStack *stack = thread->zero_stack();

  // Allocate and initialize our frame
  InterpreterFrame *frame = InterpreterFrame::build(method, CHECK_0);
  thread->push_zero_frame(frame);
  interpreterState istate = frame->interpreter_state();
  intptr_t *locals = istate->locals();

  // Update the invocation counter
  if ((UseCompiler || CountCompiledCalls) && !method->is_synchronized()) {
    InvocationCounter *counter = method->invocation_counter();
    counter->increment();
    if (counter->reached_InvocationLimit()) {
      CALL_VM_NOCHECK(
        InterpreterRuntime::frequency_counter_overflow(thread, NULL));
      if (HAS_PENDING_EXCEPTION)
        goto unwind_and_return;
    }
  }

  // Lock if necessary
  BasicObjectLock *monitor;
  monitor = NULL;
  if (method->is_synchronized()) {
    monitor = (BasicObjectLock*) istate->stack_base();
    oop lockee = monitor->obj();
    markOop disp = lockee->mark()->set_unlocked();

    monitor->lock()->set_displaced_header(disp);
    if (Atomic::cmpxchg_ptr(monitor, lockee->mark_addr(), disp) != disp) {
      if (thread->is_lock_owned((address) disp->clear_lock_bits())) {
        monitor->lock()->set_displaced_header(NULL);
      }
      else {
        CALL_VM_NOCHECK(InterpreterRuntime::monitorenter(thread, monitor));
        if (HAS_PENDING_EXCEPTION)
          goto unwind_and_return;
      }
    }
  }

  // Get the signature handler
  InterpreterRuntime::SignatureHandler *handler; {
    address handlerAddr = method->signature_handler();
    if (handlerAddr == NULL) {
      CALL_VM_NOCHECK(InterpreterRuntime::prepare_native_call(thread, method));
      if (HAS_PENDING_EXCEPTION)
        goto unlock_unwind_and_return;

      handlerAddr = method->signature_handler();
      assert(handlerAddr != NULL, "eh?");
    }
    if (handlerAddr == (address) InterpreterRuntime::slow_signature_handler) {
      CALL_VM_NOCHECK(handlerAddr =
        InterpreterRuntime::slow_signature_handler(thread, method, NULL,NULL));
      if (HAS_PENDING_EXCEPTION)
        goto unlock_unwind_and_return;
    }
    handler = \
      InterpreterRuntime::SignatureHandler::from_handlerAddr(handlerAddr);
  }

  // Get the native function entry point
  address function;
  function = method->native_function();
  assert(function != NULL, "should be set if signature handler is");

  // Build the argument list
  stack->overflow_check(handler->argument_count() * 2, THREAD);
  if (HAS_PENDING_EXCEPTION)
    goto unlock_unwind_and_return;

  void **arguments;
  void *mirror; {
    arguments =
      (void **) stack->alloc(handler->argument_count() * sizeof(void **));
    void **dst = arguments;

    void *env = thread->jni_environment();
    *(dst++) = &env;

    if (method->is_static()) {
      istate->set_oop_temp(
        method->constants()->pool_holder()->java_mirror());
      mirror = istate->oop_temp_addr();
      *(dst++) = &mirror;
    }

    intptr_t *src = locals;
    for (int i = dst - arguments; i < handler->argument_count(); i++) {
      ffi_type *type = handler->argument_type(i);
      if (type == &ffi_type_pointer) {
        if (*src) {
          stack->push((intptr_t) src);
          *(dst++) = stack->sp();
        }
        else {
          *(dst++) = src;
        }
        src--;
      }
      else if (type->size == 4) {
        *(dst++) = src--;
      }
      else if (type->size == 8) {
        src--;
        *(dst++) = src--;
      }
      else {
        ShouldNotReachHere();
      }
    }
  }

  // Set up the Java frame anchor
  thread->set_last_Java_frame();

  // Change the thread state to _thread_in_native
  ThreadStateTransition::transition_from_java(thread, _thread_in_native);

  // Make the call
  intptr_t result[4 - LogBytesPerWord];
  ffi_call(handler->cif(), (void (*)()) function, result, arguments);

  // Change the thread state back to _thread_in_Java.
  // ThreadStateTransition::transition_from_native() cannot be used
  // here because it does not check for asynchronous exceptions.
  // We have to manage the transition ourself.
  thread->set_thread_state(_thread_in_native_trans);

  // Make sure new state is visible in the GC thread
  if (os::is_MP()) {
    if (UseMembar) {
      OrderAccess::fence();
    }
    else {
      InterfaceSupport::serialize_memory(thread);
    }
  }

  // Handle safepoint operations, pending suspend requests,
  // and pending asynchronous exceptions.
  if (SafepointSynchronize::do_call_back() ||
      thread->has_special_condition_for_native_trans()) {
    JavaThread::check_special_condition_for_native_trans(thread);
    CHECK_UNHANDLED_OOPS_ONLY(thread->clear_unhandled_oops());
  }

  // Finally we can change the thread state to _thread_in_Java.
  thread->set_thread_state(_thread_in_Java);
  fixup_after_potential_safepoint();

  // Clear the frame anchor
  thread->reset_last_Java_frame();

  // If the result was an oop then unbox it and store it in
  // oop_temp where the garbage collector can see it before
  // we release the handle it might be protected by.
  if (handler->result_type() == &ffi_type_pointer) {
    if (result[0])
      istate->set_oop_temp(*(oop *) result[0]);
    else
      istate->set_oop_temp(NULL);
  }

  // Reset handle block
  thread->active_handles()->clear();

 unlock_unwind_and_return:

  // Unlock if necessary
  if (monitor) {
    BasicLock *lock = monitor->lock();
    markOop header = lock->displaced_header();
    oop rcvr = monitor->obj();
    monitor->set_obj(NULL);

    if (header != NULL) {
      if (Atomic::cmpxchg_ptr(header, rcvr->mark_addr(), lock) != lock) {
        monitor->set_obj(rcvr); {
          HandleMark hm(thread);
          CALL_VM_NOCHECK(InterpreterRuntime::monitorexit(thread, monitor));
        }
      }
    }
  }

 unwind_and_return:

  // Unwind the current activation
  thread->pop_zero_frame();

  // Pop our parameters
  stack->set_sp(stack->sp() + method->size_of_parameters());

  // Push our result
  if (!HAS_PENDING_EXCEPTION) {
    BasicType type = result_type_of(method);
    stack->set_sp(stack->sp() - type2size[type]);

    switch (type) {
    case T_VOID:
      break;

    case T_BOOLEAN:
#ifndef VM_LITTLE_ENDIAN
      result[0] <<= (BitsPerWord - BitsPerByte);
#endif
      SET_LOCALS_INT(*(jboolean *) result != 0, 0);
      break;

    case T_CHAR:
#ifndef VM_LITTLE_ENDIAN
      result[0] <<= (BitsPerWord - BitsPerShort);
#endif
      SET_LOCALS_INT(*(jchar *) result, 0);
      break;

    case T_BYTE:
#ifndef VM_LITTLE_ENDIAN
      result[0] <<= (BitsPerWord - BitsPerByte);
#endif
      SET_LOCALS_INT(*(jbyte *) result, 0);
      break;

    case T_SHORT:
#ifndef VM_LITTLE_ENDIAN
      result[0] <<= (BitsPerWord - BitsPerShort);
#endif
      SET_LOCALS_INT(*(jshort *) result, 0);
      break;

    case T_INT:
#ifndef VM_LITTLE_ENDIAN
      result[0] <<= (BitsPerWord - BitsPerInt);
#endif
      SET_LOCALS_INT(*(jint *) result, 0);
      break;

    case T_LONG:
      SET_LOCALS_LONG(*(jlong *) result, 0);
      break;

    case T_FLOAT:
      SET_LOCALS_FLOAT(*(jfloat *) result, 0);
      break;

    case T_DOUBLE:
      SET_LOCALS_DOUBLE(*(jdouble *) result, 0);
      break;

    case T_OBJECT:
    case T_ARRAY:
      SET_LOCALS_OBJECT(istate->oop_temp(), 0);
      break;

    default:
      ShouldNotReachHere();
    }
  }

  // No deoptimized frames on the stack
  return 0;
}
Ejemplo n.º 2
0
void CppInterpreter::main_loop(int recurse, TRAPS) {
  JavaThread *thread = (JavaThread *) THREAD;
  ZeroStack *stack = thread->zero_stack();

  // If we are entering from a deopt we may need to call
  // ourself a few times in order to get to our frame.
  if (recurse)
    main_loop(recurse - 1, THREAD);

  InterpreterFrame *frame = thread->top_zero_frame()->as_interpreter_frame();
  interpreterState istate = frame->interpreter_state();
  methodOop method = istate->method();

  intptr_t *result = NULL;
  int result_slots = 0;

  while (true) {
    // We can set up the frame anchor with everything we want at
    // this point as we are thread_in_Java and no safepoints can
    // occur until we go to vm mode.  We do have to clear flags
    // on return from vm but that is it.
    thread->set_last_Java_frame();

    // Call the interpreter
    if (JvmtiExport::can_post_interpreter_events())
      BytecodeInterpreter::runWithChecks(istate);
    else
      BytecodeInterpreter::run(istate);
    fixup_after_potential_safepoint();

    // Clear the frame anchor
    thread->reset_last_Java_frame();

    // Examine the message from the interpreter to decide what to do
    if (istate->msg() == BytecodeInterpreter::call_method) {
      methodOop callee = istate->callee();

      // Trim back the stack to put the parameters at the top
      stack->set_sp(istate->stack() + 1);

      // Make the call
      Interpreter::invoke_method(callee, istate->callee_entry_point(), THREAD);
      fixup_after_potential_safepoint();

      // Convert the result
      istate->set_stack(stack->sp() - 1);

      // Restore the stack
      stack->set_sp(istate->stack_limit() + 1);

      // Resume the interpreter
      istate->set_msg(BytecodeInterpreter::method_resume);
    }
    else if (istate->msg() == BytecodeInterpreter::more_monitors) {
      int monitor_words = frame::interpreter_frame_monitor_size();

      // Allocate the space
      stack->overflow_check(monitor_words, THREAD);
      if (HAS_PENDING_EXCEPTION)
        break;
      stack->alloc(monitor_words * wordSize);

      // Move the expression stack contents
      for (intptr_t *p = istate->stack() + 1; p < istate->stack_base(); p++)
        *(p - monitor_words) = *p;

      // Move the expression stack pointers
      istate->set_stack_limit(istate->stack_limit() - monitor_words);
      istate->set_stack(istate->stack() - monitor_words);
      istate->set_stack_base(istate->stack_base() - monitor_words);

      // Zero the new monitor so the interpreter can find it.
      ((BasicObjectLock *) istate->stack_base())->set_obj(NULL);

      // Resume the interpreter
      istate->set_msg(BytecodeInterpreter::got_monitors);
    }
    else if (istate->msg() == BytecodeInterpreter::return_from_method) {
      // Copy the result into the caller's frame
      result_slots = type2size[result_type_of(method)];
      assert(result_slots >= 0 && result_slots <= 2, "what?");
      result = istate->stack() + result_slots;
      break;
    }
    else if (istate->msg() == BytecodeInterpreter::throwing_exception) {
      assert(HAS_PENDING_EXCEPTION, "should do");
      break;
    }
    else if (istate->msg() == BytecodeInterpreter::do_osr) {
      // Unwind the current frame
      thread->pop_zero_frame();

      // Remove any extension of the previous frame
      int extra_locals = method->max_locals() - method->size_of_parameters();
      stack->set_sp(stack->sp() + extra_locals);

      // Jump into the OSR method
      Interpreter::invoke_osr(
        method, istate->osr_entry(), istate->osr_buf(), THREAD);
      return;
    }
    else {
      ShouldNotReachHere();
    }
  }

  // Unwind the current frame
  thread->pop_zero_frame();

  // Pop our local variables
  stack->set_sp(stack->sp() + method->max_locals());

  // Push our result
  for (int i = 0; i < result_slots; i++)
    stack->push(result[-i]);
}
Ejemplo n.º 3
0
  // The call stub is used to call Java from C
  static void call_stub(
    JavaCallWrapper *call_wrapper,
    intptr_t*        result,
    BasicType        result_type,
    methodOop        method,
    address          entry_point,
    intptr_t*        parameters,
    int              parameter_words,
    TRAPS) {
    JavaThread *thread = (JavaThread *) THREAD;
    ZeroStack *stack = thread->zero_stack();

    // Make sure we have no pending exceptions
    assert(!HAS_PENDING_EXCEPTION, "call_stub called with pending exception");

    // Set up the stack if necessary
    bool stack_needs_teardown = false;
    if (stack->needs_setup()) {
      size_t zero_stack_size = stack->suggest_size(thread);
      stack->setup(alloca(zero_stack_size), zero_stack_size);
      stack_needs_teardown = true;
    }

    // Allocate and initialize our frame
    EntryFrame *frame =
      EntryFrame::build(parameters, parameter_words, call_wrapper, THREAD);

    if (!HAS_PENDING_EXCEPTION) {
      // Push the frame
      thread->push_zero_frame(frame);

      // Make the call
      Interpreter::invoke_method(method, entry_point, THREAD);

      // Store the result
      if (!HAS_PENDING_EXCEPTION) {
        switch (result_type) {
        case T_INT:
          *(jint *) result = *(jint *) stack->sp();
          break;
        case T_LONG:
          *(jlong *) result = *(jlong *) stack->sp();
          break;
        case T_FLOAT:
          *(jfloat *) result = *(jfloat *) stack->sp();
          break;
        case T_DOUBLE:
          *(jdouble *) result = *(jdouble *) stack->sp();
          break;
        case T_OBJECT:
          *(oop *) result = *(oop *) stack->sp();
          break;
        default:
          ShouldNotReachHere();
        }
      }

      // Unwind the frame
      thread->pop_zero_frame();
    }

    // Tear down the stack if necessary
    if (stack_needs_teardown)
      stack->teardown();
  }