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Java example source code file (sharkRuntime.cpp)

This example Java source code file (sharkRuntime.cpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

basicobjectlock, check, check_0, exceptions\:\:_throw_msg, fakestubframe\:\:build, javathread, jrt_end, jrt_entry, klass, klasshandle, sharkruntime\:\:monitorenter, sharkruntime\:\:throw_arithmeticexception, thread, zerostack

The sharkRuntime.cpp Java example source code

/*
 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2008, 2009, 2010 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 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 "runtime/biasedLocking.hpp"
#include "runtime/deoptimization.hpp"
#include "runtime/thread.hpp"
#include "shark/llvmHeaders.hpp"
#include "shark/sharkRuntime.hpp"
#ifdef TARGET_ARCH_zero
# include "stack_zero.inline.hpp"
#endif

using namespace llvm;

JRT_ENTRY(int, SharkRuntime::find_exception_handler(JavaThread* thread,
                                                    int*        indexes,
                                                    int         num_indexes))
  constantPoolHandle pool(thread, method(thread)->constants());
  KlassHandle exc_klass(thread, ((oop) tos_at(thread, 0))->klass());

  for (int i = 0; i < num_indexes; i++) {
    Klass* tmp = pool->klass_at(indexes[i], CHECK_0);
    KlassHandle chk_klass(thread, tmp);

    if (exc_klass() == chk_klass())
      return i;

    if (exc_klass()->is_subtype_of(chk_klass()))
      return i;
  }

  return -1;
JRT_END

JRT_ENTRY(void, SharkRuntime::monitorenter(JavaThread*      thread,
                                           BasicObjectLock* lock))
  if (PrintBiasedLockingStatistics)
    Atomic::inc(BiasedLocking::slow_path_entry_count_addr());

  Handle object(thread, lock->obj());
  assert(Universe::heap()->is_in_reserved_or_null(object()), "should be");
  if (UseBiasedLocking) {
    // Retry fast entry if bias is revoked to avoid unnecessary inflation
    ObjectSynchronizer::fast_enter(object, lock->lock(), true, CHECK);
  } else {
    ObjectSynchronizer::slow_enter(object, lock->lock(), CHECK);
  }
  assert(Universe::heap()->is_in_reserved_or_null(lock->obj()), "should be");
JRT_END

JRT_ENTRY(void, SharkRuntime::monitorexit(JavaThread*      thread,
                                          BasicObjectLock* lock))
  Handle object(thread, lock->obj());
  assert(Universe::heap()->is_in_reserved_or_null(object()), "should be");
  if (lock == NULL || object()->is_unlocked()) {
    THROW(vmSymbols::java_lang_IllegalMonitorStateException());
  }
  ObjectSynchronizer::slow_exit(object(), lock->lock(), thread);
JRT_END

JRT_ENTRY(void, SharkRuntime::new_instance(JavaThread* thread, int index))
  Klass* k_oop = method(thread)->constants()->klass_at(index, CHECK);
  instanceKlassHandle klass(THREAD, k_oop);

  // Make sure we are not instantiating an abstract klass
  klass->check_valid_for_instantiation(true, CHECK);

  // Make sure klass is initialized
  klass->initialize(CHECK);

  // At this point the class may not be fully initialized
  // because of recursive initialization. If it is fully
  // initialized & has_finalized is not set, we rewrite
  // it into its fast version (Note: no locking is needed
  // here since this is an atomic byte write and can be
  // done more than once).
  //
  // Note: In case of classes with has_finalized we don't
  //       rewrite since that saves us an extra check in
  //       the fast version which then would call the
  //       slow version anyway (and do a call back into
  //       Java).
  //       If we have a breakpoint, then we don't rewrite
  //       because the _breakpoint bytecode would be lost.
  oop obj = klass->allocate_instance(CHECK);
  thread->set_vm_result(obj);
JRT_END

JRT_ENTRY(void, SharkRuntime::newarray(JavaThread* thread,
                                       BasicType   type,
                                       int         size))
  oop obj = oopFactory::new_typeArray(type, size, CHECK);
  thread->set_vm_result(obj);
JRT_END

JRT_ENTRY(void, SharkRuntime::anewarray(JavaThread* thread,
                                        int         index,
                                        int         size))
  Klass* klass = method(thread)->constants()->klass_at(index, CHECK);
  objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
  thread->set_vm_result(obj);
JRT_END

JRT_ENTRY(void, SharkRuntime::multianewarray(JavaThread* thread,
                                             int         index,
                                             int         ndims,
                                             int*        dims))
  Klass* klass = method(thread)->constants()->klass_at(index, CHECK);
  oop obj = ArrayKlass::cast(klass)->multi_allocate(ndims, dims, CHECK);
  thread->set_vm_result(obj);
JRT_END

JRT_ENTRY(void, SharkRuntime::register_finalizer(JavaThread* thread,
                                                 oop         object))
  assert(object->is_oop(), "should be");
  assert(object->klass()->has_finalizer(), "should have");
  InstanceKlass::register_finalizer(instanceOop(object), CHECK);
JRT_END

JRT_ENTRY(void, SharkRuntime::throw_ArithmeticException(JavaThread* thread,
                                                        const char* file,
                                                        int         line))
  Exceptions::_throw_msg(
    thread, file, line,
    vmSymbols::java_lang_ArithmeticException(),
    "");
JRT_END

JRT_ENTRY(void, SharkRuntime::throw_ArrayIndexOutOfBoundsException(
                                                     JavaThread* thread,
                                                     const char* file,
                                                     int         line,
                                                     int         index))
  char msg[jintAsStringSize];
  snprintf(msg, sizeof(msg), "%d", index);
  Exceptions::_throw_msg(
    thread, file, line,
    vmSymbols::java_lang_ArrayIndexOutOfBoundsException(),
    msg);
JRT_END

JRT_ENTRY(void, SharkRuntime::throw_ClassCastException(JavaThread* thread,
                                                       const char* file,
                                                       int         line))
  Exceptions::_throw_msg(
    thread, file, line,
    vmSymbols::java_lang_ClassCastException(),
    "");
JRT_END

JRT_ENTRY(void, SharkRuntime::throw_NullPointerException(JavaThread* thread,
                                                         const char* file,
                                                         int         line))
  Exceptions::_throw_msg(
    thread, file, line,
    vmSymbols::java_lang_NullPointerException(),
    "");
JRT_END

// Non-VM calls
// Nothing in these must ever GC!

void SharkRuntime::dump(const char *name, intptr_t value) {
  oop valueOop = (oop) value;
  tty->print("%s = ", name);
  if (valueOop->is_oop(true))
    valueOop->print_on(tty);
  else if (value >= ' ' && value <= '~')
    tty->print("'%c' (%d)", value, value);
  else
    tty->print("%p", value);
  tty->print_cr("");
}

bool SharkRuntime::is_subtype_of(Klass* check_klass, Klass* object_klass) {
  return object_klass->is_subtype_of(check_klass);
}

int SharkRuntime::uncommon_trap(JavaThread* thread, int trap_request) {
  Thread *THREAD = thread;

  // In C2, uncommon_trap_blob creates a frame, so all the various
  // deoptimization functions expect to find the frame of the method
  // being deopted one frame down on the stack.  We create a dummy
  // frame to mirror this.
  FakeStubFrame *stubframe = FakeStubFrame::build(CHECK_0);
  thread->push_zero_frame(stubframe);

  // Initiate the trap
  thread->set_last_Java_frame();
  Deoptimization::UnrollBlock *urb =
    Deoptimization::uncommon_trap(thread, trap_request);
  thread->reset_last_Java_frame();

  // Pop our dummy frame and the frame being deoptimized
  thread->pop_zero_frame();
  thread->pop_zero_frame();

  // Push skeleton frames
  int number_of_frames = urb->number_of_frames();
  for (int i = 0; i < number_of_frames; i++) {
    intptr_t size = urb->frame_sizes()[i];
    InterpreterFrame *frame = InterpreterFrame::build(size, CHECK_0);
    thread->push_zero_frame(frame);
  }

  // Push another dummy frame
  stubframe = FakeStubFrame::build(CHECK_0);
  thread->push_zero_frame(stubframe);

  // Fill in the skeleton frames
  thread->set_last_Java_frame();
  Deoptimization::unpack_frames(thread, Deoptimization::Unpack_uncommon_trap);
  thread->reset_last_Java_frame();

  // Pop our dummy frame
  thread->pop_zero_frame();

  // Fall back into the interpreter
  return number_of_frames;
}

FakeStubFrame* FakeStubFrame::build(TRAPS) {
  ZeroStack *stack = ((JavaThread *) THREAD)->zero_stack();
  stack->overflow_check(header_words, CHECK_NULL);

  stack->push(0); // next_frame, filled in later
  intptr_t *fp = stack->sp();
  assert(fp - stack->sp() == next_frame_off, "should be");

  stack->push(FAKE_STUB_FRAME);
  assert(fp - stack->sp() == frame_type_off, "should be");

  return (FakeStubFrame *) fp;
}

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