/*

 * Copyright 2003-2007 Sun Microsystems, Inc.  All Rights Reserved.

 * Copyright 2007, 2008, 2009 Red Hat, Inc.

 * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 *

 */

#include "incls/_precompiled.incl"

#include "incls/_cppInterpreter_zero.cpp.incl"

#ifdef CC_INTERP

#define fixup_after_potential_safepoint()       \

  method = istate->method()

#define CALL_VM_NOCHECK(func)                   \

  thread->set_last_Java_frame();                \

  func;                                         \

  thread->reset_last_Java_frame();              \

  fixup_after_potential_safepoint()

void CppInterpreter::normal_entry(methodOop method, intptr_t UNUSED, TRAPS) {

  JavaThread *thread = (JavaThread *) THREAD;

  ZeroStack *stack = thread->zero_stack();

  // Adjust the caller's stack frame to accomodate any additional

  // local variables we have contiguously with our parameters.

  int extra_locals = method->max_locals() - method->size_of_parameters();

  if (extra_locals > 0) {

    if (extra_locals > stack->available_words()) {

      Unimplemented();

    }

    for (int i = 0; i < extra_locals; i++)

      stack->push(0);

  }

  // Allocate and initialize our frame.

  InterpreterFrame *frame = InterpreterFrame::build(stack, method, thread);

  thread->push_zero_frame(frame);

  // Execute those bytecodes!

  main_loop(0, THREAD);

}

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;

  // Check we're not about to run out of stack

  if (stack_overflow_imminent(thread)) {

    CALL_VM_NOCHECK(InterpreterRuntime::throw_StackOverflowError(thread));

    goto unwind_and_return;

  }

  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

      if (monitor_words > stack->available_words()) {

        Unimplemented();

      }

      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[method->result_type()];

      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_and_return:

  // 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]);

}

void 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(stack, method, thread);

  thread->push_zero_frame(frame);

  interpreterState istate = frame->interpreter_state();

  intptr_t *locals = istate->locals();

  // Check we're not about to run out of stack

  if (stack_overflow_imminent(thread)) {

    CALL_VM_NOCHECK(InterpreterRuntime::throw_StackOverflowError(thread));

    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 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 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

  if (handler->argument_count() * 2 > stack->available_words()) {

    Unimplemented();

  }

  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()->klass_part()->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 if necessary.  It seems totally wrong that this

  // is skipped in the event of an exception but apparently

  // the template interpreter does this so we do too.

  if (monitor && !HAS_PENDING_EXCEPTION) {

    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) {

    stack->set_sp(stack->sp() - type2size[method->result_type()]);

    switch (method->result_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();

    }

  }

}

void CppInterpreter::accessor_entry(methodOop method, intptr_t UNUSED, TRAPS) {

  JavaThread *thread = (JavaThread *) THREAD;

  ZeroStack *stack = thread->zero_stack();

  intptr_t *locals = stack->sp();

  // Drop into the slow path if we need a safepoint check

  if (SafepointSynchronize::do_call_back()) {

    normal_entry(method, 0, THREAD);

    return;

  }

  // Load the object pointer and drop into the slow path

  // if we have a NullPointerException

  oop object = LOCALS_OBJECT(0);

  if (object == NULL) {

    normal_entry(method, 0, THREAD);

    return;

  }

  // Read the field index from the bytecode, which looks like this:

  //  0:  aload_0

  //  1:  getfield

  //  2:    index

  //  3:    index

  //  4:  ireturn/areturn

  // NB this is not raw bytecode: index is in machine order

  u1 *code = method->code_base();

  assert(code[0] == Bytecodes::_aload_0 &&

         code[1] == Bytecodes::_getfield &&

         (code[4] == Bytecodes::_ireturn ||

          code[4] == Bytecodes::_areturn), "should do");

  u2 index = Bytes::get_native_u2(&code[2]);

  // Get the entry from the constant pool cache, and drop into

  // the slow path if it has not been resolved

  constantPoolCacheOop cache = method->constants()->cache();

  ConstantPoolCacheEntry* entry = cache->entry_at(index);

  if (!entry->is_resolved(Bytecodes::_getfield)) {

    normal_entry(method, 0, THREAD);

    return;

  }

  // Get the result and push it onto the stack

  switch (entry->flag_state()) {

  case ltos:

  case dtos:

    if (stack->available_words() < 1) {

      Unimplemented();

    }

    stack->alloc(wordSize);

    break;

  }

  if (entry->is_volatile()) {

    switch (entry->flag_state()) {

    case ctos:

      SET_LOCALS_INT(object->char_field_acquire(entry->f2()), 0);

      break;

    case btos:

      SET_LOCALS_INT(object->byte_field_acquire(entry->f2()), 0);

      break;

    case stos:

      SET_LOCALS_INT(object->short_field_acquire(entry->f2()), 0);

      break;

    case itos: