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src/hotspot/share/runtime/synchronizer.cpp

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@@ -302,10 +302,24 @@
  bool volatile ObjectSynchronizer::_is_final_audit = false;
  jlong ObjectSynchronizer::_last_async_deflation_time_ns = 0;
  static uintx _no_progress_cnt = 0;
  static bool _no_progress_skip_increment = false;
  
+ #define CHECK_THROW_NOSYNC_IMSE(obj)  \
+   if (EnableValhalla && (obj)->mark().is_inline_type()) {  \
+     JavaThread* THREAD = current;           \
+     ResourceMark rm(THREAD);                \
+     THROW_MSG(vmSymbols::java_lang_IllegalMonitorStateException(), obj->klass()->external_name()); \
+   }
+ 
+ #define CHECK_THROW_NOSYNC_IMSE_0(obj)  \
+   if (EnableValhalla && (obj)->mark().is_inline_type()) {  \
+     JavaThread* THREAD = current;             \
+     ResourceMark rm(THREAD);                  \
+     THROW_MSG_0(vmSymbols::java_lang_IllegalMonitorStateException(), obj->klass()->external_name()); \
+   }
+ 
  // =====================> Quick functions
  
  // The quick_* forms are special fast-path variants used to improve
  // performance.  In the simplest case, a "quick_*" implementation could
  // simply return false, in which case the caller will perform the necessary

@@ -328,10 +342,11 @@
  
  bool ObjectSynchronizer::quick_notify(oopDesc* obj, JavaThread* current, bool all) {
    assert(current->thread_state() == _thread_in_Java, "invariant");
    NoSafepointVerifier nsv;
    if (obj == nullptr) return false;  // slow-path for invalid obj
+   assert(!EnableValhalla || !obj->klass()->is_inline_klass(), "monitor op on inline type");
    const markWord mark = obj->mark();
  
    if (LockingMode == LM_LIGHTWEIGHT) {
      if (mark.is_fast_locked() && current->lock_stack().contains(cast_to_oop(obj))) {
        // Degenerate notify

@@ -384,10 +399,11 @@
  bool ObjectSynchronizer::quick_enter(oop obj, JavaThread* current,
                                       BasicLock * lock) {
    assert(current->thread_state() == _thread_in_Java, "invariant");
    NoSafepointVerifier nsv;
    if (obj == nullptr) return false;       // Need to throw NPE
+   assert(!EnableValhalla || !obj->klass()->is_inline_klass(), "monitor op on inline type");
  
    if (obj->klass()->is_value_based()) {
      return false;
    }
  

@@ -505,10 +521,11 @@
  // The interpreter and compiler assembly code tries to lock using the fast path
  // of this algorithm. Make sure to update that code if the following function is
  // changed. The implementation is extremely sensitive to race condition. Be careful.
  
  void ObjectSynchronizer::enter(Handle obj, BasicLock* lock, JavaThread* current) {
+   CHECK_THROW_NOSYNC_IMSE(obj);
    if (obj->klass()->is_value_based()) {
      handle_sync_on_value_based_class(obj, current);
    }
  
    current->inc_held_monitor_count();

@@ -574,10 +591,13 @@
  void ObjectSynchronizer::exit(oop object, BasicLock* lock, JavaThread* current) {
    current->dec_held_monitor_count();
  
    if (!useHeavyMonitors()) {
      markWord mark = object->mark();
+     if (EnableValhalla && mark.is_inline_type()) {
+       return;
+     }
      if (LockingMode == LM_LIGHTWEIGHT) {
        // Fast-locking does not use the 'lock' argument.
        if (mark.is_fast_locked()) {
          markWord unlocked_mark = mark.set_unlocked();
          markWord old_mark = object->cas_set_mark(unlocked_mark, mark);

@@ -653,10 +673,11 @@
  // NOTE: must use heavy weight monitor to handle jni monitor enter
  void ObjectSynchronizer::jni_enter(Handle obj, JavaThread* current) {
    if (obj->klass()->is_value_based()) {
      handle_sync_on_value_based_class(obj, current);
    }
+   CHECK_THROW_NOSYNC_IMSE(obj);
  
    // the current locking is from JNI instead of Java code
    current->set_current_pending_monitor_is_from_java(false);
    // An async deflation can race after the inflate() call and before
    // enter() can make the ObjectMonitor busy. enter() returns false if

@@ -672,10 +693,11 @@
  }
  
  // NOTE: must use heavy weight monitor to handle jni monitor exit
  void ObjectSynchronizer::jni_exit(oop obj, TRAPS) {
    JavaThread* current = THREAD;
+   CHECK_THROW_NOSYNC_IMSE(obj);
  
    // The ObjectMonitor* can't be async deflated until ownership is
    // dropped inside exit() and the ObjectMonitor* must be !is_busy().
    ObjectMonitor* monitor = inflate(current, obj, inflate_cause_jni_exit);
    // If this thread has locked the object, exit the monitor. We

@@ -710,10 +732,11 @@
  // -----------------------------------------------------------------------------
  //  Wait/Notify/NotifyAll
  // NOTE: must use heavy weight monitor to handle wait()
  int ObjectSynchronizer::wait(Handle obj, jlong millis, TRAPS) {
    JavaThread* current = THREAD;
+   CHECK_THROW_NOSYNC_IMSE_0(obj);
    if (millis < 0) {
      THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
    }
    // The ObjectMonitor* can't be async deflated because the _waiters
    // field is incremented before ownership is dropped and decremented

@@ -731,10 +754,11 @@
    return ret_code;
  }
  
  void ObjectSynchronizer::notify(Handle obj, TRAPS) {
    JavaThread* current = THREAD;
+   CHECK_THROW_NOSYNC_IMSE(obj);
  
    markWord mark = obj->mark();
    if (LockingMode == LM_LIGHTWEIGHT) {
      if ((mark.is_fast_locked() && current->lock_stack().contains(obj()))) {
        // Not inflated so there can't be any waiters to notify.

@@ -753,10 +777,11 @@
  }
  
  // NOTE: see comment of notify()
  void ObjectSynchronizer::notifyall(Handle obj, TRAPS) {
    JavaThread* current = THREAD;
+   CHECK_THROW_NOSYNC_IMSE(obj);
  
    markWord mark = obj->mark();
    if (LockingMode == LM_LIGHTWEIGHT) {
      if ((mark.is_fast_locked() && current->lock_stack().contains(obj()))) {
        // Not inflated so there can't be any waiters to notify.

@@ -914,10 +939,14 @@
    assert(LockingMode == LM_LIGHTWEIGHT, "only call this with new lightweight locking enabled");
    return thread->is_Java_thread() ? JavaThread::cast(thread)->lock_stack().contains(obj) : false;
  }
  
  intptr_t ObjectSynchronizer::FastHashCode(Thread* current, oop obj) {
+   if (EnableValhalla && obj->klass()->is_inline_klass()) {
+     // VM should be calling bootstrap method
+     ShouldNotReachHere();
+   }
  
    while (true) {
      ObjectMonitor* monitor = nullptr;
      markWord temp, test;
      intptr_t hash;

@@ -1034,10 +1063,13 @@
    }
  }
  
  bool ObjectSynchronizer::current_thread_holds_lock(JavaThread* current,
                                                     Handle h_obj) {
+   if (EnableValhalla && h_obj->mark().is_inline_type()) {
+     return false;
+   }
    assert(current == JavaThread::current(), "Can only be called on current thread");
    oop obj = h_obj();
  
    markWord mark = read_stable_mark(obj);
  

@@ -1305,10 +1337,14 @@
    (void)inflate(Thread::current(), obj, inflate_cause_vm_internal);
  }
  
  ObjectMonitor* ObjectSynchronizer::inflate(Thread* current, oop object,
                                             const InflateCause cause) {
+   if (EnableValhalla) {
+     guarantee(!object->klass()->is_inline_klass(), "Attempt to inflate inline type");
+   }
+ 
    EventJavaMonitorInflate event;
  
    for (;;) {
      const markWord mark = object->mark_acquire();
  
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