8130847: Cloned object's fields observed as null after C2 escape analysis

Eliminated instance/array written to by an array copy variant must be correctly initialized when reallocated at a deopt

Reviewed-by: kvn, vlivanov

hotspot/src/share/vm/opto/arraycopynode.cpp

@@ -626,3 +626,75 @@ bool ArrayCopyNode::may_modify(const TypeOopPtr *t_oop, PhaseTransform *phase) {
 
   return CallNode::may_modify_arraycopy_helper(dest_t, t_oop, phase);
 }
+
+bool ArrayCopyNode::may_modify_helper(const TypeOopPtr *t_oop, Node* n, PhaseTransform *phase) {
+  if (n->is_Proj()) {
+    n = n->in(0);
+    if (n->is_Call() && n->as_Call()->may_modify(t_oop, phase)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+bool ArrayCopyNode::may_modify(const TypeOopPtr *t_oop, MemBarNode* mb, PhaseTransform *phase) {
+  Node* mem = mb->in(TypeFunc::Memory);
+
+  if (mem->is_MergeMem()) {
+    Node* n = mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw);
+    if (may_modify_helper(t_oop, n, phase)) {
+      return true;
+    } else if (n->is_Phi()) {
+      for (uint i = 1; i < n->req(); i++) {
+        if (n->in(i) != NULL) {
+          if (may_modify_helper(t_oop, n->in(i), phase)) {
+            return true;
+          }
+        }
+      }
+    }
+  }
+
+  return false;
+}
+
+// Does this array copy modify offsets between offset_lo and offset_hi
+// in the destination array
+// if must_modify is false, return true if the copy could write
+// between offset_lo and offset_hi
+// if must_modify is true, return true if the copy is guaranteed to
+// write between offset_lo and offset_hi
+bool ArrayCopyNode::modifies(intptr_t offset_lo, intptr_t offset_hi, PhaseTransform* phase, bool must_modify) {
+  assert(_kind == ArrayCopy || _kind == CopyOf || _kind == CopyOfRange, "only for real array copies");
+
+  Node* dest = in(ArrayCopyNode::Dest);
+  Node* src_pos = in(ArrayCopyNode::SrcPos);
+  Node* dest_pos = in(ArrayCopyNode::DestPos);
+  Node* len = in(ArrayCopyNode::Length);
+
+  const TypeInt *dest_pos_t = phase->type(dest_pos)->isa_int();
+  const TypeInt *len_t = phase->type(len)->isa_int();
+  const TypeAryPtr* ary_t = phase->type(dest)->isa_aryptr();
+
+  if (dest_pos_t != NULL && len_t != NULL && ary_t != NULL) {
+    BasicType ary_elem = ary_t->klass()->as_array_klass()->element_type()->basic_type();
+    uint header = arrayOopDesc::base_offset_in_bytes(ary_elem);
+    uint elemsize = type2aelembytes(ary_elem);
+
+    intptr_t dest_pos_plus_len_lo = (((intptr_t)dest_pos_t->_lo) + len_t->_lo) * elemsize + header;
+    intptr_t dest_pos_plus_len_hi = (((intptr_t)dest_pos_t->_hi) + len_t->_hi) * elemsize + header;
+    intptr_t dest_pos_lo = ((intptr_t)dest_pos_t->_lo) * elemsize + header;
+    intptr_t dest_pos_hi = ((intptr_t)dest_pos_t->_hi) * elemsize + header;
+
+    if (must_modify) {
+      if (offset_lo >= dest_pos_hi && offset_hi < dest_pos_plus_len_lo) {
+        return true;
+      }
+    } else {
+      if (offset_hi >= dest_pos_lo && offset_lo < dest_pos_plus_len_hi) {
+        return true;
+      }
+    }
+  }
+  return false;
+}

hotspot/src/share/vm/opto/arraycopynode.hpp

@@ -108,6 +108,7 @@ private:
                             BasicType copy_type, const Type* value_type, int count);
   bool finish_transform(PhaseGVN *phase, bool can_reshape,
                         Node* ctl, Node *mem);
+  static bool may_modify_helper(const TypeOopPtr *t_oop, Node* n, PhaseTransform *phase);
 
 public:
 
@@ -162,6 +163,9 @@ public:
 
   bool is_alloc_tightly_coupled() const { return _alloc_tightly_coupled; }
 
+  static bool may_modify(const TypeOopPtr *t_oop, MemBarNode* mb, PhaseTransform *phase);
+  bool modifies(intptr_t offset_lo, intptr_t offset_hi, PhaseTransform* phase, bool must_modify);
+
 #ifndef PRODUCT
   virtual void dump_spec(outputStream *st) const;
   virtual void dump_compact_spec(outputStream* st) const;

hotspot/src/share/vm/opto/callnode.cpp

@@ -742,7 +742,7 @@ uint CallNode::match_edge(uint idx) const {
 //
 bool CallNode::may_modify(const TypeOopPtr *t_oop, PhaseTransform *phase) {
   assert((t_oop != NULL), "sanity");
-  if (is_call_to_arraycopystub()) {
+  if (is_call_to_arraycopystub() && strcmp(_name, "unsafe_arraycopy") != 0) {
     const TypeTuple* args = _tf->domain();
     Node* dest = NULL;
     // Stubs that can be called once an ArrayCopyNode is expanded have

hotspot/src/share/vm/opto/macro.cpp

@@ -324,18 +324,28 @@ static Node *scan_mem_chain(Node *mem, int alias_idx, int offset, Node *start_me
         return in;
       } else if (in->is_Call()) {
         CallNode *call = in->as_Call();
-        if (!call->may_modify(tinst, phase)) {
+        if (call->may_modify(tinst, phase)) {
-          mem = call->in(TypeFunc::Memory);
+          assert(call->is_ArrayCopy(), "ArrayCopy is the only call node that doesn't make allocation escape");
+
+          if (call->as_ArrayCopy()->modifies(offset, offset, phase, false)) {
+            return in;
+          }
         }
         mem = in->in(TypeFunc::Memory);
       } else if (in->is_MemBar()) {
+        if (ArrayCopyNode::may_modify(tinst, in->as_MemBar(), phase)) {
+          assert(in->in(0)->is_Proj() && in->in(0)->in(0)->is_ArrayCopy(), "should be arraycopy");
+          ArrayCopyNode* ac = in->in(0)->in(0)->as_ArrayCopy();
+          assert(ac->is_clonebasic(), "Only basic clone is a non escaping clone");
+          return ac;
+        }
         mem = in->in(TypeFunc::Memory);
       } else {
         assert(false, "unexpected projection");
       }
     } else if (mem->is_Store()) {
       const TypePtr* atype = mem->as_Store()->adr_type();
-      int adr_idx = Compile::current()->get_alias_index(atype);
+      int adr_idx = phase->C->get_alias_index(atype);
       if (adr_idx == alias_idx) {
         assert(atype->isa_oopptr(), "address type must be oopptr");
         int adr_offset = atype->offset();
@@ -373,7 +383,7 @@ static Node *scan_mem_chain(Node *mem, int alias_idx, int offset, Node *start_me
         adr = mem->in(3); // Destination array
       }
       const TypePtr* atype = adr->bottom_type()->is_ptr();
-      int adr_idx = Compile::current()->get_alias_index(atype);
+      int adr_idx = phase->C->get_alias_index(atype);
       if (adr_idx == alias_idx) {
         assert(false, "Object is not scalar replaceable if a LoadStore node access its field");
         return NULL;
@@ -386,12 +396,63 @@ static Node *scan_mem_chain(Node *mem, int alias_idx, int offset, Node *start_me
   }
 }
 
+// Generate loads from source of the arraycopy for fields of
+// destination needed at a deoptimization point
+Node* PhaseMacroExpand::make_arraycopy_load(ArrayCopyNode* ac, intptr_t offset, Node* ctl, BasicType ft, const Type *ftype, AllocateNode *alloc) {
+  BasicType bt = ft;
+  const Type *type = ftype;
+  if (ft == T_NARROWOOP) {
+    bt = T_OBJECT;
+    type = ftype->make_oopptr();
+  }
+  Node* res = NULL;
+  if (ac->is_clonebasic()) {
+    Node* base = ac->in(ArrayCopyNode::Src)->in(AddPNode::Base);
+    Node* adr = _igvn.transform(new AddPNode(base, base, MakeConX(offset)));
+    const TypePtr* adr_type = _igvn.type(base)->is_ptr()->add_offset(offset);
+    Node* m = ac->in(TypeFunc::Memory);
+    while (m->is_MergeMem()) {
+      m = m->as_MergeMem()->memory_at(C->get_alias_index(adr_type));
+      if (m->is_Proj() && m->in(0)->is_MemBar()) {
+        m = m->in(0)->in(TypeFunc::Memory);
+      }
+    }
+    res = LoadNode::make(_igvn, ctl, m, adr, adr_type, type, bt, MemNode::unordered, LoadNode::Pinned);
+  } else {
+    if (ac->modifies(offset, offset, &_igvn, true)) {
+      assert(ac->in(ArrayCopyNode::Dest) == alloc->result_cast(), "arraycopy destination should be allocation's result");
+      uint shift  = exact_log2(type2aelembytes(bt));
+      Node* diff = _igvn.transform(new SubINode(ac->in(ArrayCopyNode::SrcPos), ac->in(ArrayCopyNode::DestPos)));
+#ifdef _LP64
+      diff = _igvn.transform(new ConvI2LNode(diff));
+#endif
+      diff = _igvn.transform(new LShiftXNode(diff, intcon(shift)));
+
+      Node* off = _igvn.transform(new AddXNode(MakeConX(offset), diff));
+      Node* base = ac->in(ArrayCopyNode::Src);
+      Node* adr = _igvn.transform(new AddPNode(base, base, off));
+      const TypePtr* adr_type = _igvn.type(base)->is_ptr()->add_offset(offset);
+      Node* m = ac->in(TypeFunc::Memory);
+      res = LoadNode::make(_igvn, ctl, m, adr, adr_type, type, bt, MemNode::unordered, LoadNode::Pinned);
+    }
+  }
+  if (res != NULL) {
+    res = _igvn.transform(res);
+    if (ftype->isa_narrowoop()) {
+      // PhaseMacroExpand::scalar_replacement adds DecodeN nodes
+      res = _igvn.transform(new EncodePNode(res, ftype));
+    }
+    return res;
+  }
+  return NULL;
+}
+
 //
 // Given a Memory Phi, compute a value Phi containing the values from stores
 // on the input paths.
-// Note: this function is recursive, its depth is limied by the "level" argument
+// Note: this function is recursive, its depth is limited by the "level" argument
 // Returns the computed Phi, or NULL if it cannot compute it.
-Node *PhaseMacroExpand::value_from_mem_phi(Node *mem, BasicType ft, const Type *phi_type, const TypeOopPtr *adr_t, Node *alloc, Node_Stack *value_phis, int level) {
+Node *PhaseMacroExpand::value_from_mem_phi(Node *mem, BasicType ft, const Type *phi_type, const TypeOopPtr *adr_t, AllocateNode *alloc, Node_Stack *value_phis, int level) {
   assert(mem->is_Phi(), "sanity");
   int alias_idx = C->get_alias_index(adr_t);
   int offset = adr_t->offset();
@@ -458,6 +519,9 @@ Node *PhaseMacroExpand::value_from_mem_phi(Node *mem, BasicType ft, const Type *
         assert(val->in(0)->is_LoadStore() || val->in(0)->Opcode() == Op_EncodeISOArray, "sanity");
         assert(false, "Object is not scalar replaceable if a LoadStore node access its field");
         return NULL;
+      } else if (val->is_ArrayCopy()) {
+        Node* res = make_arraycopy_load(val->as_ArrayCopy(), offset, val->in(0), ft, phi_type, alloc);
+        values.at_put(j, res);
       } else {
 #ifdef ASSERT
         val->dump();
@@ -479,7 +543,7 @@ Node *PhaseMacroExpand::value_from_mem_phi(Node *mem, BasicType ft, const Type *
 }
 
 // Search the last value stored into the object's field.
-Node *PhaseMacroExpand::value_from_mem(Node *sfpt_mem, BasicType ft, const Type *ftype, const TypeOopPtr *adr_t, Node *alloc) {
+Node *PhaseMacroExpand::value_from_mem(Node *sfpt_mem, Node *sfpt_ctl, BasicType ft, const Type *ftype, const TypeOopPtr *adr_t, AllocateNode *alloc) {
   assert(adr_t->is_known_instance_field(), "instance required");
   int instance_id = adr_t->instance_id();
   assert((uint)instance_id == alloc->_idx, "wrong allocation");
@@ -538,6 +602,8 @@ Node *PhaseMacroExpand::value_from_mem(Node *sfpt_mem, BasicType ft, const Type
       } else {
         done = true;
       }
+    } else if (mem->is_ArrayCopy()) {
+      done = true;
     } else {
       assert(false, "unexpected node");
     }
@@ -562,6 +628,13 @@ Node *PhaseMacroExpand::value_from_mem(Node *sfpt_mem, BasicType ft, const Type
           value_phis.pop();
         }
       }
+    } else if (mem->is_ArrayCopy()) {
+      Node* ctl = mem->in(0);
+      if (sfpt_ctl->is_Proj() && sfpt_ctl->as_Proj()->is_uncommon_trap_proj(Deoptimization::Reason_none)) {
+        // pin the loads in the uncommon trap path
+        ctl = sfpt_ctl;
+      }
+      return make_arraycopy_load(mem->as_ArrayCopy(), offset, ctl, ft, ftype, alloc);
     }
   }
   // Something go wrong.
@@ -738,6 +811,7 @@ bool PhaseMacroExpand::scalar_replacement(AllocateNode *alloc, GrowableArray <Sa
   while (safepoints.length() > 0) {
     SafePointNode* sfpt = safepoints.pop();
     Node* mem = sfpt->memory();
+    Node* ctl = sfpt->control();
     assert(sfpt->jvms() != NULL, "missed JVMS");
     // Fields of scalar objs are referenced only at the end
     // of regular debuginfo at the last (youngest) JVMS.
@@ -789,7 +863,7 @@ bool PhaseMacroExpand::scalar_replacement(AllocateNode *alloc, GrowableArray <Sa
 
       const TypeOopPtr *field_addr_type = res_type->add_offset(offset)->isa_oopptr();
 
-      Node *field_val = value_from_mem(mem, basic_elem_type, field_type, field_addr_type, alloc);
+      Node *field_val = value_from_mem(mem, ctl, basic_elem_type, field_type, field_addr_type, alloc);
       if (field_val == NULL) {
         // We weren't able to find a value for this field,
         // give up on eliminating this allocation.

hotspot/src/share/vm/opto/macro.hpp

@@ -85,8 +85,8 @@ private:
                               Node* length,
                               const TypeFunc* slow_call_type,
                               address slow_call_address);
-  Node *value_from_mem(Node *mem, BasicType ft, const Type *ftype, const TypeOopPtr *adr_t, Node *alloc);
+  Node *value_from_mem(Node *mem, Node *ctl, BasicType ft, const Type *ftype, const TypeOopPtr *adr_t, AllocateNode *alloc);
-  Node *value_from_mem_phi(Node *mem, BasicType ft, const Type *ftype, const TypeOopPtr *adr_t, Node *alloc, Node_Stack *value_phis, int level);
+  Node *value_from_mem_phi(Node *mem, BasicType ft, const Type *ftype, const TypeOopPtr *adr_t, AllocateNode *alloc, Node_Stack *value_phis, int level);
 
   bool eliminate_boxing_node(CallStaticJavaNode *boxing);
   bool eliminate_allocate_node(AllocateNode *alloc);
@@ -200,6 +200,8 @@ private:
                             Node* old_eden_top, Node* new_eden_top,
                             Node* length);
 
+  Node* make_arraycopy_load(ArrayCopyNode* ac, intptr_t offset, Node* ctl, BasicType ft, const Type *ftype, AllocateNode *alloc);
+
 public:
   PhaseMacroExpand(PhaseIterGVN &igvn) : Phase(Macro_Expand), _igvn(igvn), _has_locks(false) {
     _igvn.set_delay_transform(true);

hotspot/src/share/vm/opto/memnode.cpp

@@ -108,37 +108,6 @@ extern void print_alias_types();
 
 #endif
 
-static bool membar_for_arraycopy_helper(const TypeOopPtr *t_oop, Node* n, PhaseTransform *phase) {
-  if (n->is_Proj()) {
-    n = n->in(0);
-    if (n->is_Call() && n->as_Call()->may_modify(t_oop, phase)) {
-      return true;
-    }
-  }
-  return false;
-}
-
-static bool membar_for_arraycopy(const TypeOopPtr *t_oop, MemBarNode* mb, PhaseTransform *phase) {
-  Node* mem = mb->in(TypeFunc::Memory);
-
-  if (mem->is_MergeMem()) {
-    Node* n = mem->as_MergeMem()->memory_at(Compile::AliasIdxRaw);
-    if (membar_for_arraycopy_helper(t_oop, n, phase)) {
-      return true;
-    } else if (n->is_Phi()) {
-      for (uint i = 1; i < n->req(); i++) {
-        if (n->in(i) != NULL) {
-          if (membar_for_arraycopy_helper(t_oop, n->in(i), phase)) {
-            return true;
-          }
-        }
-      }
-    }
-  }
-
-  return false;
-}
-
 Node *MemNode::optimize_simple_memory_chain(Node *mchain, const TypeOopPtr *t_oop, Node *load, PhaseGVN *phase) {
   assert((t_oop != NULL), "sanity");
   bool is_instance = t_oop->is_known_instance_field();
@@ -183,7 +152,7 @@ Node *MemNode::optimize_simple_memory_chain(Node *mchain, const TypeOopPtr *t_oo
           }
         }
       } else if (proj_in->is_MemBar()) {
-        if (membar_for_arraycopy(t_oop, proj_in->as_MemBar(), phase)) {
+        if (ArrayCopyNode::may_modify(t_oop, proj_in->as_MemBar(), phase)) {
           break;
         }
         result = proj_in->in(TypeFunc::Memory);
@@ -545,36 +514,13 @@ Node* LoadNode::find_previous_arraycopy(PhaseTransform* phase, Node* ld_alloc, N
         Node* dest = ac->in(ArrayCopyNode::Dest);
 
         if (dest == ld_base) {
-          Node* src_pos = ac->in(ArrayCopyNode::SrcPos);
-          Node* dest_pos = ac->in(ArrayCopyNode::DestPos);
-          Node* len = ac->in(ArrayCopyNode::Length);
-
-          const TypeInt *dest_pos_t = phase->type(dest_pos)->isa_int();
           const TypeX *ld_offs_t = phase->type(ld_offs)->isa_intptr_t();
-          const TypeInt *len_t = phase->type(len)->isa_int();
+          if (ac->modifies(ld_offs_t->_lo, ld_offs_t->_hi, phase, can_see_stored_value)) {
-          const TypeAryPtr* ary_t = phase->type(dest)->isa_aryptr();
-
-          if (dest_pos_t != NULL && ld_offs_t != NULL && len_t != NULL && ary_t != NULL) {
-            BasicType ary_elem  = ary_t->klass()->as_array_klass()->element_type()->basic_type();
-            uint header = arrayOopDesc::base_offset_in_bytes(ary_elem);
-            uint elemsize = type2aelembytes(ary_elem);
-
-            intptr_t dest_pos_plus_len_lo = (((intptr_t)dest_pos_t->_lo) + len_t->_lo) * elemsize + header;
-            intptr_t dest_pos_plus_len_hi = (((intptr_t)dest_pos_t->_hi) + len_t->_hi) * elemsize + header;
-            intptr_t dest_pos_lo = ((intptr_t)dest_pos_t->_lo) * elemsize + header;
-            intptr_t dest_pos_hi = ((intptr_t)dest_pos_t->_hi) * elemsize + header;
-
-            if (can_see_stored_value) {
-              if (ld_offs_t->_lo >= dest_pos_hi && ld_offs_t->_hi < dest_pos_plus_len_lo) {
             return ac;
           }
-            } else {
+          if (!can_see_stored_value) {
-              if (ld_offs_t->_hi < dest_pos_lo || ld_offs_t->_lo >= dest_pos_plus_len_hi) {
             mem = ac->in(TypeFunc::Memory);
           }
-              return ac;
-            }
-          }
         }
       }
     }
@@ -703,7 +649,7 @@ Node* MemNode::find_previous_store(PhaseTransform* phase) {
           continue;         // (a) advance through independent call memory
         }
       } else if (mem->is_Proj() && mem->in(0)->is_MemBar()) {
-        if (membar_for_arraycopy(addr_t, mem->in(0)->as_MemBar(), phase)) {
+        if (ArrayCopyNode::may_modify(addr_t, mem->in(0)->as_MemBar(), phase)) {
           break;
         }
         mem = mem->in(0)->in(TypeFunc::Memory);
@@ -883,18 +829,17 @@ static bool skip_through_membars(Compile::AliasType* atp, const TypeInstPtr* tp,
 // Is the value loaded previously stored by an arraycopy? If so return
 // a load node that reads from the source array so we may be able to
 // optimize out the ArrayCopy node later.
-Node* MemNode::can_see_arraycopy_value(Node* st, PhaseTransform* phase) const {
+Node* LoadNode::can_see_arraycopy_value(Node* st, PhaseTransform* phase) const {
   Node* ld_adr = in(MemNode::Address);
   intptr_t ld_off = 0;
   AllocateNode* ld_alloc = AllocateNode::Ideal_allocation(ld_adr, phase, ld_off);
   Node* ac = find_previous_arraycopy(phase, ld_alloc, st, true);
   if (ac != NULL) {
     assert(ac->is_ArrayCopy(), "what kind of node can this be?");
-    assert(is_Load(), "only for loads");
 
+    Node* ld = clone();
     if (ac->as_ArrayCopy()->is_clonebasic()) {
       assert(ld_alloc != NULL, "need an alloc");
-      Node* ld = clone();
       Node* addp = in(MemNode::Address)->clone();
       assert(addp->is_AddP(), "address must be addp");
       assert(addp->in(AddPNode::Base) == ac->in(ArrayCopyNode::Dest)->in(AddPNode::Base), "strange pattern");
@@ -906,9 +851,7 @@ Node* MemNode::can_see_arraycopy_value(Node* st, PhaseTransform* phase) const {
         assert(ld_alloc->in(0) != NULL, "alloc must have control");
         ld->set_req(0, ld_alloc->in(0));
       }
-      return ld;
     } else {
-      Node* ld = clone();
       Node* addp = in(MemNode::Address)->clone();
       assert(addp->in(AddPNode::Base) == addp->in(AddPNode::Address), "should be");
       addp->set_req(AddPNode::Base, ac->in(ArrayCopyNode::Src));
@@ -933,8 +876,10 @@ Node* MemNode::can_see_arraycopy_value(Node* st, PhaseTransform* phase) const {
         assert(ac->in(0) != NULL, "alloc must have control");
         ld->set_req(0, ac->in(0));
       }
-      return ld;
     }
+    // load depends on the tests that validate the arraycopy
+    ld->as_Load()->_depends_only_on_test = Pinned;
+    return ld;
   }
   return NULL;
 }

hotspot/src/share/vm/opto/memnode.hpp

@@ -126,7 +126,6 @@ public:
   // Can this node (load or store) accurately see a stored value in
   // the given memory state?  (The state may or may not be in(Memory).)
   Node* can_see_stored_value(Node* st, PhaseTransform* phase) const;
-  Node* can_see_arraycopy_value(Node* st, PhaseTransform* phase) const;
 
 #ifndef PRODUCT
   static void dump_adr_type(const Node* mem, const TypePtr* adr_type, outputStream *st);
@@ -252,6 +251,9 @@ public:
 protected:
   const Type* load_array_final_field(const TypeKlassPtr *tkls,
                                      ciKlass* klass) const;
+
+  Node* can_see_arraycopy_value(Node* st, PhaseTransform* phase) const;
+
   // depends_only_on_test is almost always true, and needs to be almost always
   // true to enable key hoisting & commoning optimizations.  However, for the
   // special case of RawPtr loads from TLS top & end, and other loads performed by

hotspot/test/compiler/arraycopy/TestEliminatedArrayCopyDeopt.java

@@ -0,0 +1,204 @@
+/*
+ * Copyright (c) 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8130847
+ * @summary Eliminated instance/array written to by an array copy variant must be correctly initialized when reallocated at a deopt
+ * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement TestEliminatedArrayCopyDeopt
+ *
+ */
+
+// Test that if an ArrayCopy node is eliminated because it doesn't
+// escape, then the correct field/array element values are captured so
+// on a deoptimization, when the object/array is reallocated, it is
+// correctly initialized
+
+public class TestEliminatedArrayCopyDeopt {
+
+    static class A implements Cloneable {
+        int f0;
+        int f1;
+        int f2;
+        int f3;
+        int f4;
+        int f5;
+        int f6;
+        int f7;
+        int f8;
+        int f9;
+        int f10;
+        int f11;
+        int f12;
+        int f13;
+        int f14;
+        int f15;
+
+        public Object clone() throws CloneNotSupportedException {
+            return super.clone();
+        }
+    }
+
+    // Clone
+    static boolean m1(A a, boolean flag) throws CloneNotSupportedException {
+        A c = (A)a.clone();
+        if (flag) {
+            // never taken branch that causes the deoptimization
+            if (c.f0 != 0x42) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    // Array clone
+    static int[] m2_src = null;
+    static boolean m2(boolean flag) throws CloneNotSupportedException {
+        int[] src  = new int[10];
+        m2_src = src;
+        for (int i = 0; i < src.length; i++) {
+            src[i] = 0x42+i;
+        }
+        int[] c = (int[])src.clone();
+        if (flag) {
+            for (int i = 0; i < c.length; i++) {
+                if (c[i] != src[i]) {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+    // Array copy
+    static boolean m3(int[] src, boolean flag) {
+        int[] dst = new int[10];
+        System.arraycopy(src, 0, dst, 0, 10);
+        if (flag) {
+            for (int i = 0; i < dst.length; i++) {
+                if (dst[i] != src[i]) {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+    // Array copy of subrange
+    static boolean m4(int[] src, boolean flag) {
+        int[] dst = new int[10];
+        dst[0] = 0x42;
+        dst[1] = 0x42 - 1;
+        dst[2] = 0x42 - 2;
+        dst[8] = 0x42 - 8;
+        dst[9] = 0x42 - 9;
+        int src_off = 2;
+        int dst_off = 3;
+        int len = 5;
+        System.arraycopy(src, src_off, dst, dst_off, len);
+        if (flag) {
+            for (int i = 0; i < dst.length; i++) {
+                if (i >= dst_off &&  i < dst_off + len) {
+                    if (dst[i] != src[i - dst_off + src_off]) {
+                        return false;
+                    }
+                } else {
+                    if (dst[i] != 0x42-i) {
+                        return false;
+                    }
+                }
+            }
+        }
+        return true;
+    }
+
+    // Array copy with Phi
+    static boolean m5(int[] src, boolean flag1, boolean flag2) {
+        int[] dst = new int[10];
+        if (flag1) {
+            System.arraycopy(src, 0, dst, 0, 10);
+        }
+        if (flag2) {
+            for (int i = 0; i < dst.length; i++) {
+                if (dst[i] != src[i]) {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+    static public void main(String[] args) throws Exception {
+        boolean success = true;
+        A a = new A();
+        a.f0 = 0x42;
+        for (int i = 0; i < 20000; i++) {
+            m1(a, false);
+        }
+        if (!m1(a, true)) {
+            System.out.println("m1 failed");
+            success = false;
+        }
+
+        for (int i = 0; i < 20000; i++) {
+            m2(false);
+        }
+        if (!m2(true)) {
+            System.out.println("m2 failed");
+            success = false;
+        }
+
+        int[] src = new int[10];
+        for (int i = 0; i < src.length; i++) {
+            src[i] = 0x42+i;
+        }
+
+        for (int i = 0; i < 20000; i++) {
+            m3(src, false);
+        }
+        if (!m3(src, true)) {
+            System.out.println("m3 failed");
+            success = false;
+        }
+
+        for (int i = 0; i < 20000; i++) {
+            m4(src, false);
+        }
+        if (!m4(src, true)) {
+            System.out.println("m4 failed");
+            success = false;
+        }
+
+        for (int i = 0; i < 20000; i++) {
+            m5(src, i%2 == 0, false);
+        }
+        if (!m5(src, true, true)) {
+            System.out.println("m4 failed");
+            success = false;
+        }
+
+        if (!success) {
+            throw new RuntimeException("Test failed");
+        }
+    }
+}