Merge

src/share/vm/ci/ciEnv.cpp

@@ -385,11 +385,6 @@ ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass,
                                                      KILL_COMPILE_ON_FATAL_(fail_type));
   }
 
-  if (found_klass != NULL) {
-    // Found it.  Build a CI handle.
-    return get_object(found_klass)->as_klass();
-  }
-
   // If we fail to find an array klass, look again for its element type.
   // The element type may be available either locally or via constraints.
   // In either case, if we can find the element type in the system dictionary,
@@ -414,6 +409,11 @@ ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass,
     }
   }
 
+  if (found_klass != NULL) {
+    // Found it.  Build a CI handle.
+    return get_object(found_klass)->as_klass();
+  }
+
   if (require_local)  return NULL;
   // Not yet loaded into the VM, or not governed by loader constraints.
   // Make a CI representative for it.

src/share/vm/classfile/loaderConstraints.cpp

@@ -334,33 +334,6 @@ klassOop LoaderConstraintTable::find_constrained_klass(symbolHandle name,
   return NULL;
 }
 
-
-klassOop LoaderConstraintTable::find_constrained_elem_klass(symbolHandle name,
-                                                            symbolHandle elem_name,
-                                                            Handle loader,
-                                                            TRAPS) {
-  LoaderConstraintEntry *p = *(find_loader_constraint(name, loader));
-  if (p != NULL) {
-    assert(p->klass() == NULL, "Expecting null array klass");
-
-    // The array name has a constraint, but it will not have a class. Check
-    // each loader for an associated elem
-    for (int i = 0; i < p->num_loaders(); i++) {
-      Handle no_protection_domain;
-
-      klassOop k = SystemDictionary::find(elem_name, p->loader(i), no_protection_domain, THREAD);
-      if (k != NULL) {
-        // Return the first elem klass found.
-        return k;
-      }
-    }
-  }
-
-  // No constraints, or else no klass loaded yet.
-  return NULL;
-}
-
-
 void LoaderConstraintTable::ensure_loader_constraint_capacity(
                                                      LoaderConstraintEntry *p,
                                                     int nfree) {

src/share/vm/classfile/loaderConstraints.hpp

@@ -66,9 +66,6 @@ public:
   //                                           bool is_method, TRAPS)
 
   klassOop find_constrained_klass(symbolHandle name, Handle loader);
-  klassOop find_constrained_elem_klass(symbolHandle name, symbolHandle elem_name,
-                                       Handle loader, TRAPS);
-
 
   // Class loader constraints
 

src/share/vm/classfile/systemDictionary.cpp

@@ -2178,9 +2178,8 @@ klassOop SystemDictionary::find_constrained_instance_or_array_klass(
   // a loader constraint that would require this loader to return the
   // klass that is already loaded.
   if (FieldType::is_array(class_name())) {
-    // Array classes are hard because their klassOops are not kept in the
-    // constraint table. The array klass may be constrained, but the elem class
-    // may not be.
+    // For array classes, their klassOops are not kept in the
+    // constraint table. The element klassOops are.
     jint dimension;
     symbolOop object_key;
     BasicType t = FieldType::get_array_info(class_name(), &dimension,
@@ -2190,8 +2189,9 @@ klassOop SystemDictionary::find_constrained_instance_or_array_klass(
     } else {
       symbolHandle elem_name(THREAD, object_key);
       MutexLocker mu(SystemDictionary_lock, THREAD);
-      klass = constraints()->find_constrained_elem_klass(class_name, elem_name, class_loader, THREAD);
+      klass = constraints()->find_constrained_klass(elem_name, class_loader);
     }
+    // If element class already loaded, allocate array klass
     if (klass != NULL) {
       klass = Klass::cast(klass)->array_klass_or_null(dimension);
     }
@@ -2209,22 +2209,38 @@ bool SystemDictionary::add_loader_constraint(symbolHandle class_name,
                                              Handle class_loader1,
                                              Handle class_loader2,
                                              Thread* THREAD) {
-  unsigned int d_hash1 = dictionary()->compute_hash(class_name, class_loader1);
+  symbolHandle constraint_name;
+  if (!FieldType::is_array(class_name())) {
+    constraint_name = class_name;
+  } else {
+    // For array classes, their klassOops are not kept in the
+    // constraint table. The element classes are.
+    jint dimension;
+    symbolOop object_key;
+    BasicType t = FieldType::get_array_info(class_name(), &dimension,
+                                            &object_key, CHECK_(false));
+    // primitive types always pass
+    if (t != T_OBJECT) {
+      return true;
+    } else {
+      constraint_name = symbolHandle(THREAD, object_key);
+    }
+  }
+  unsigned int d_hash1 = dictionary()->compute_hash(constraint_name, class_loader1);
   int d_index1 = dictionary()->hash_to_index(d_hash1);
 
-  unsigned int d_hash2 = dictionary()->compute_hash(class_name, class_loader2);
+  unsigned int d_hash2 = dictionary()->compute_hash(constraint_name, class_loader2);
   int d_index2 = dictionary()->hash_to_index(d_hash2);
-
   {
-    MutexLocker mu_s(SystemDictionary_lock, THREAD);
+  MutexLocker mu_s(SystemDictionary_lock, THREAD);
 
-    // Better never do a GC while we're holding these oops
-    No_Safepoint_Verifier nosafepoint;
+  // Better never do a GC while we're holding these oops
+  No_Safepoint_Verifier nosafepoint;
 
-    klassOop klass1 = find_class(d_index1, d_hash1, class_name, class_loader1);
-    klassOop klass2 = find_class(d_index2, d_hash2, class_name, class_loader2);
-    return constraints()->add_entry(class_name, klass1, class_loader1,
-                                    klass2, class_loader2);
+  klassOop klass1 = find_class(d_index1, d_hash1, constraint_name, class_loader1);
+  klassOop klass2 = find_class(d_index2, d_hash2, constraint_name, class_loader2);
+  return constraints()->add_entry(constraint_name, klass1, class_loader1,
+                                  klass2, class_loader2);
   }
 }
 
@@ -2301,6 +2317,7 @@ symbolOop SystemDictionary::find_resolution_error(constantPoolHandle pool, int w
 // Returns the name of the type that failed a loader constraint check, or
 // NULL if no constraint failed. The returned C string needs cleaning up
 // with a ResourceMark in the caller.  No exception except OOME is thrown.
+// Arrays are not added to the loader constraint table, their elements are.
 char* SystemDictionary::check_signature_loaders(symbolHandle signature,
                                                Handle loader1, Handle loader2,
                                                bool is_method, TRAPS)  {

src/share/vm/oops/typeArrayKlass.cpp

@@ -123,16 +123,16 @@ void typeArrayKlass::copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos
      || (((unsigned int) length + (unsigned int) dst_pos) > (unsigned int) d->length()) ) {
     THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
   }
+  // Check zero copy
+  if (length == 0)
+    return;
 
   // This is an attempt to make the copy_array fast.
-  // NB: memmove takes care of overlapping memory segments.
-  // Potential problem: memmove is not guaranteed to be word atomic
-  // Revisit in Merlin
   int l2es = log2_element_size();
   int ihs = array_header_in_bytes() / wordSize;
-  char* src = (char*) ((oop*)s + ihs) + (src_pos << l2es);
-  char* dst = (char*) ((oop*)d + ihs) + (dst_pos << l2es);
-  memmove(dst, src, length << l2es);
+  char* src = (char*) ((oop*)s + ihs) + ((size_t)src_pos << l2es);
+  char* dst = (char*) ((oop*)d + ihs) + ((size_t)dst_pos << l2es);
+  Copy::conjoint_memory_atomic(src, dst, (size_t)length << l2es);
 }
 
 

src/share/vm/opto/cfgnode.cpp

@@ -956,6 +956,7 @@ const Type *PhiNode::Value( PhaseTransform *phase ) const {
     }
     if( jtkp && ttkp ) {
       if( jtkp->is_loaded() &&  jtkp->klass()->is_interface() &&
+          !jtkp->klass_is_exact() && // Keep exact interface klass (6894807)
           ttkp->is_loaded() && !ttkp->klass()->is_interface() ) {
         assert(ft == ttkp->cast_to_ptr_type(jtkp->ptr()) ||
                ft->isa_narrowoop() && ft->make_ptr() == ttkp->cast_to_ptr_type(jtkp->ptr()), "");

src/share/vm/opto/type.cpp

@@ -2545,12 +2545,15 @@ const Type *TypeOopPtr::filter( const Type *kills ) const {
       ftip->is_loaded() &&  ftip->klass()->is_interface() &&
       ktip->is_loaded() && !ktip->klass()->is_interface()) {
     // Happens in a CTW of rt.jar, 320-341, no extra flags
+    assert(!ftip->klass_is_exact(), "interface could not be exact");
     return ktip->cast_to_ptr_type(ftip->ptr());
   }
+  // Interface klass type could be exact in opposite to interface type,
+  // return it here instead of incorrect Constant ptr J/L/Object (6894807).
   if (ftkp != NULL && ktkp != NULL &&
       ftkp->is_loaded() &&  ftkp->klass()->is_interface() &&
+      !ftkp->klass_is_exact() && // Keep exact interface klass
       ktkp->is_loaded() && !ktkp->klass()->is_interface()) {
-    // Happens in a CTW of rt.jar, 320-341, no extra flags
     return ktkp->cast_to_ptr_type(ftkp->ptr());
   }
 

test/compiler/6892265/Test.java

+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * 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.
+ *
+ */
+
+/**
+ * @test
+ * @bug 6892265
+ * @summary System.arraycopy unable to reference elements beyond Integer.MAX_VALUE bytes
+ *
+ * @run main/othervm Test
+ */
+
+public class Test {
+  static  final int NCOPY = 1;
+  static  final int OVERFLOW = 1;
+  static  int[] src2 = new int[NCOPY];
+  static  int[] dst2;
+
+  static void test() {
+    int N;
+    int SIZE;
+
+    N = Integer.MAX_VALUE/4 + OVERFLOW;
+    System.arraycopy(src2, 0, dst2, N, NCOPY);
+    System.arraycopy(dst2, N, src2, 0, NCOPY);
+  }
+
+  public static void main(String[] args) {
+    try {
+      dst2 = new int[NCOPY + Integer.MAX_VALUE/4 + OVERFLOW];
+    } catch (OutOfMemoryError e) {
+       System.exit(95); // Not enough memory
+    }
+    System.out.println("warmup");
+    for (int i=0; i <11000; i++) {
+      test();
+    }
+    System.out.println("start");
+    for (int i=0; i <1000; i++) {
+      test();
+    }
+    System.out.println("finish");
+  }
+
+}