Merge

.hgtags-top-repo

@@ -236,3 +236,4 @@ d086227bfc45d124f09b3bd72a07956b4073bf71 jdk8-b111
 547316ea137d83d9c63083a9b83db64198fe0c81 jdk8-b112
 6ba4c7cb623ec612031e05cf8bf279d8f407bd1e jdk8-b113
 4f2011496393a26dcfd7b1f7787a3673ddd32599 jdk8-b114
+763ada2a1d8c5962bc8c3d297e57c562d2e95338 jdk8-b115

hotspot/.hgtags

@@ -391,3 +391,5 @@ f6962730bbde82f279a0ae3a1c14bc5e58096c6e jdk8-b111
 82a9cdbf683e374a76f2009352de53e16bed5a91 hs25-b56
 7fd913010dbbf75260688fd2fa8964763fa49a09 jdk8-b114
 3b32d287da89a47a45d16f6d9ba5bd3cd9bf4b3e hs25-b57
+9ebaac78a8a0061fb9597e07f806498cb626cdeb jdk8-b115
+e510dfdec6dd701410f3398ed86ebcdff0cca63a hs25-b58

hotspot/make/hotspot_version

@@ -35,7 +35,7 @@ HOTSPOT_VM_COPYRIGHT=Copyright 2013
 
 HS_MAJOR_VER=25
 HS_MINOR_VER=0
-HS_BUILD_NUMBER=57
+HS_BUILD_NUMBER=58
 
 JDK_MAJOR_VER=1
 JDK_MINOR_VER=8

hotspot/src/cpu/sparc/vm/macroAssembler_sparc.cpp

@@ -3526,8 +3526,12 @@ void MacroAssembler::bang_stack_size(Register Rsize, Register Rtsp,
   delayed()->sub(Rtsp, Roffset, Rtsp);
 
   // Bang down shadow pages too.
-  // The -1 because we already subtracted 1 page.
+  // At this point, (tmp-0) is the last address touched, so don't
-  for (int i = 0; i< StackShadowPages-1; i++) {
+  // touch it again.  (It was touched as (tmp-pagesize) but then tmp
+  // was post-decremented.)  Skip this address by starting at i=1, and
+  // touch a few more pages below.  N.B.  It is important to touch all
+  // the way down to and including i=StackShadowPages.
+  for (int i = 1; i <= StackShadowPages; i++) {
     set((-i*offset)+STACK_BIAS, Rscratch);
     st(G0, Rtsp, Rscratch);
   }

hotspot/src/cpu/sparc/vm/sparc.ad

@@ -2916,6 +2916,9 @@ enc_class Fast_Unlock(iRegP oop, iRegP box, o7RegP scratch, iRegP scratch2) %{
       __ bind(LSkip2);
     }
 
+    // We have no guarantee that on 64 bit the higher half of limit_reg is 0
+    __ signx(limit_reg);
+
     __ subcc(limit_reg, 1 * sizeof(jchar), chr1_reg);
     __ br(Assembler::equal, true, Assembler::pn, Ldone);
     __ delayed()->mov(O7, result_reg);  // result is difference in lengths
@@ -2973,6 +2976,9 @@ enc_class enc_String_Equals(o0RegP str1, o1RegP str2, g3RegI cnt, notemp_iRegI r
     Register  chr1_reg = result_reg;
     Register  chr2_reg =   tmp1_reg;
 
+    // We have no guarantee that on 64 bit the higher half of limit_reg is 0
+    __ signx(limit_reg);
+
     //check for alignment and position the pointers to the ends
     __ or3(str1_reg, str2_reg, chr1_reg);
     __ andcc(chr1_reg, 0x3, chr1_reg);

hotspot/src/cpu/x86/vm/interp_masm_x86_32.cpp

@@ -196,7 +196,7 @@ void InterpreterMacroAssembler::check_and_handle_earlyret(Register java_thread)
 
 void InterpreterMacroAssembler::get_unsigned_2_byte_index_at_bcp(Register reg, int bcp_offset) {
   assert(bcp_offset >= 0, "bcp is still pointing to start of bytecode");
-  movl(reg, Address(rsi, bcp_offset));
+  load_unsigned_short(reg, Address(rsi, bcp_offset));
   bswapl(reg);
   shrl(reg, 16);
 }

hotspot/src/cpu/x86/vm/interp_masm_x86_64.cpp

@@ -192,7 +192,7 @@ void InterpreterMacroAssembler::get_unsigned_2_byte_index_at_bcp(
   Register reg,
   int bcp_offset) {
   assert(bcp_offset >= 0, "bcp is still pointing to start of bytecode");
-  movl(reg, Address(r13, bcp_offset));
+  load_unsigned_short(reg, Address(r13, bcp_offset));
   bswapl(reg);
   shrl(reg, 16);
 }

hotspot/src/cpu/x86/vm/macroAssembler_x86.cpp

@@ -1381,8 +1381,12 @@ void MacroAssembler::bang_stack_size(Register size, Register tmp) {
   jcc(Assembler::greater, loop);
 
   // Bang down shadow pages too.
-  // The -1 because we already subtracted 1 page.
+  // At this point, (tmp-0) is the last address touched, so don't
-  for (int i = 0; i< StackShadowPages-1; i++) {
+  // touch it again.  (It was touched as (tmp-pagesize) but then tmp
+  // was post-decremented.)  Skip this address by starting at i=1, and
+  // touch a few more pages below.  N.B.  It is important to touch all
+  // the way down to and including i=StackShadowPages.
+  for (int i = 1; i <= StackShadowPages; i++) {
     // this could be any sized move but this is can be a debugging crumb
     // so the bigger the better.
     movptr(Address(tmp, (-i*os::vm_page_size())), size );

hotspot/src/cpu/x86/vm/templateTable_x86_32.cpp

@@ -558,7 +558,7 @@ void TemplateTable::aload() {
 
 
 void TemplateTable::locals_index_wide(Register reg) {
-  __ movl(reg, at_bcp(2));
+  __ load_unsigned_short(reg, at_bcp(2));
   __ bswapl(reg);
   __ shrl(reg, 16);
   __ negptr(reg);
@@ -1552,7 +1552,11 @@ void TemplateTable::branch(bool is_jsr, bool is_wide) {
                               InvocationCounter::counter_offset();
 
   // Load up EDX with the branch displacement
-  __ movl(rdx, at_bcp(1));
+  if (is_wide) {
+    __ movl(rdx, at_bcp(1));
+  } else {
+    __ load_signed_short(rdx, at_bcp(1));
+  }
   __ bswapl(rdx);
   if (!is_wide) __ sarl(rdx, 16);
   LP64_ONLY(__ movslq(rdx, rdx));

hotspot/src/cpu/x86/vm/templateTable_x86_64.cpp

@@ -568,7 +568,7 @@ void TemplateTable::aload() {
 }
 
 void TemplateTable::locals_index_wide(Register reg) {
-  __ movl(reg, at_bcp(2));
+  __ load_unsigned_short(reg, at_bcp(2));
   __ bswapl(reg);
   __ shrl(reg, 16);
   __ negptr(reg);
@@ -1575,7 +1575,11 @@ void TemplateTable::branch(bool is_jsr, bool is_wide) {
                               InvocationCounter::counter_offset();
 
   // Load up edx with the branch displacement
-  __ movl(rdx, at_bcp(1));
+  if (is_wide) {
+    __ movl(rdx, at_bcp(1));
+  } else {
+    __ load_signed_short(rdx, at_bcp(1));
+  }
   __ bswapl(rdx);
 
   if (!is_wide) {

hotspot/src/share/vm/asm/assembler.cpp

@@ -122,7 +122,7 @@ void AbstractAssembler::bind(Label& L) {
 void AbstractAssembler::generate_stack_overflow_check( int frame_size_in_bytes) {
   if (UseStackBanging) {
     // Each code entry causes one stack bang n pages down the stack where n
-    // is configurable by StackBangPages.  The setting depends on the maximum
+    // is configurable by StackShadowPages.  The setting depends on the maximum
     // depth of VM call stack or native before going back into java code,
     // since only java code can raise a stack overflow exception using the
     // stack banging mechanism.  The VM and native code does not detect stack

hotspot/src/share/vm/c1/c1_LinearScan.cpp

@@ -1138,8 +1138,10 @@ IntervalUseKind LinearScan::use_kind_of_input_operand(LIR_Op* op, LIR_Opr opr) {
         }
       }
     }
-
+    // We want to sometimes use logical operations on pointers, in particular in GC barriers.
-  } else if (opr_type != T_LONG) {
+    // Since 64bit logical operations do not current support operands on stack, we have to make sure
+    // T_OBJECT doesn't get spilled along with T_LONG.
+  } else if (opr_type != T_LONG LP64_ONLY(&& opr_type != T_OBJECT)) {
     // integer instruction (note: long operands must always be in register)
     switch (op->code()) {
       case lir_cmp:

hotspot/src/share/vm/classfile/defaultMethods.cpp

@@ -392,10 +392,16 @@ class MethodFamily : public ResourceObj {
     }
 
     GrowableArray<Method*> qualified_methods;
+    int num_defaults = 0;
+    int default_index = -1;
     for (int i = 0; i < _members.length(); ++i) {
       Pair<Method*,QualifiedState> entry = _members.at(i);
       if (entry.second == QUALIFIED) {
         qualified_methods.append(entry.first);
+        default_index++;
+        if (entry.first->is_default_method()) {
+          num_defaults++;
+        }
       }
     }
 
@@ -408,6 +414,9 @@ class MethodFamily : public ResourceObj {
       if (!method->is_abstract()) {
         _selected_target = qualified_methods.at(0);
       }
+      // If only one qualified method is default, select that
+    } else if (num_defaults == 1) {
+        _selected_target = qualified_methods.at(default_index);
     } else {
       _exception_message = generate_conflicts_message(&qualified_methods,CHECK);
       _exception_name = vmSymbols::java_lang_IncompatibleClassChangeError();

hotspot/src/share/vm/classfile/metadataOnStackMark.cpp

@@ -27,6 +27,7 @@
 #include "code/codeCache.hpp"
 #include "compiler/compileBroker.hpp"
 #include "oops/metadata.hpp"
+#include "prims/jvmtiImpl.hpp"
 #include "runtime/synchronizer.hpp"
 #include "runtime/thread.hpp"
 #include "utilities/growableArray.hpp"
@@ -48,6 +49,7 @@ MetadataOnStackMark::MetadataOnStackMark() {
   Threads::metadata_do(Metadata::mark_on_stack);
   CodeCache::alive_nmethods_do(nmethod::mark_on_stack);
   CompileBroker::mark_on_stack();
+  JvmtiCurrentBreakpoints::metadata_do(Metadata::mark_on_stack);
 }
 
 MetadataOnStackMark::~MetadataOnStackMark() {

hotspot/src/share/vm/memory/metaspace.cpp

@@ -2869,7 +2869,7 @@ void Metaspace::set_narrow_klass_base_and_shift(address metaspace_base, address
 
   Universe::set_narrow_klass_base(lower_base);
 
-  if ((uint64_t)(higher_address - lower_base) < UnscaledClassSpaceMax) {
+  if ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax) {
     Universe::set_narrow_klass_shift(0);
   } else {
     assert(!UseSharedSpaces, "Cannot shift with UseSharedSpaces");
@@ -2885,7 +2885,7 @@ bool Metaspace::can_use_cds_with_metaspace_addr(char* metaspace_base, address cd
   address lower_base = MIN2((address)metaspace_base, cds_base);
   address higher_address = MAX2((address)(cds_base + FileMapInfo::shared_spaces_size()),
                                 (address)(metaspace_base + compressed_class_space_size()));
-  return ((uint64_t)(higher_address - lower_base) < UnscaledClassSpaceMax);
+  return ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax);
 }
 
 // Try to allocate the metaspace at the requested addr.

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

@@ -848,6 +848,7 @@ Compile::Compile( ciEnv* ci_env, C2Compiler* compiler, ciMethod* target, int osr
   }
 #endif
 
+  NOT_PRODUCT( verify_barriers(); )
   // Now that we know the size of all the monitors we can add a fixed slot
   // for the original deopt pc.
 
@@ -3018,12 +3019,17 @@ void Compile::final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc) {
           // Phi nodes shouldn't be moved. They would only match below if they
           // had the same control as the MathExactNode. The only time that
           // would happen is if the Phi is also an input to the MathExact
-          if (!out->is_Phi()) {
+          //
-            if (out->in(0) == NULL) {
+          // Cmp nodes shouldn't have control set at all.
-              out->set_req(0, non_throwing);
+          if (out->is_Phi() ||
-            } else if (out->in(0) == ctrl) {
+              out->is_Cmp()) {
-              out->set_req(0, non_throwing);
+            continue;
-            }
+          }
+
+          if (out->in(0) == NULL) {
+            out->set_req(0, non_throwing);
+          } else if (out->in(0) == ctrl) {
+            out->set_req(0, non_throwing);
           }
         }
       }
@@ -3368,6 +3374,72 @@ void Compile::verify_graph_edges(bool no_dead_code) {
     }
   }
 }
+
+// Verify GC barriers consistency
+// Currently supported:
+// - G1 pre-barriers (see GraphKit::g1_write_barrier_pre())
+void Compile::verify_barriers() {
+  if (UseG1GC) {
+    // Verify G1 pre-barriers
+    const int marking_offset = in_bytes(JavaThread::satb_mark_queue_offset() + PtrQueue::byte_offset_of_active());
+
+    ResourceArea *area = Thread::current()->resource_area();
+    Unique_Node_List visited(area);
+    Node_List worklist(area);
+    // We're going to walk control flow backwards starting from the Root
+    worklist.push(_root);
+    while (worklist.size() > 0) {
+      Node* x = worklist.pop();
+      if (x == NULL || x == top()) continue;
+      if (visited.member(x)) {
+        continue;
+      } else {
+        visited.push(x);
+      }
+
+      if (x->is_Region()) {
+        for (uint i = 1; i < x->req(); i++) {
+          worklist.push(x->in(i));
+        }
+      } else {
+        worklist.push(x->in(0));
+        // We are looking for the pattern:
+        //                            /->ThreadLocal
+        // If->Bool->CmpI->LoadB->AddP->ConL(marking_offset)
+        //              \->ConI(0)
+        // We want to verify that the If and the LoadB have the same control
+        // See GraphKit::g1_write_barrier_pre()
+        if (x->is_If()) {
+          IfNode *iff = x->as_If();
+          if (iff->in(1)->is_Bool() && iff->in(1)->in(1)->is_Cmp()) {
+            CmpNode *cmp = iff->in(1)->in(1)->as_Cmp();
+            if (cmp->Opcode() == Op_CmpI && cmp->in(2)->is_Con() && cmp->in(2)->bottom_type()->is_int()->get_con() == 0
+                && cmp->in(1)->is_Load()) {
+              LoadNode* load = cmp->in(1)->as_Load();
+              if (load->Opcode() == Op_LoadB && load->in(2)->is_AddP() && load->in(2)->in(2)->Opcode() == Op_ThreadLocal
+                  && load->in(2)->in(3)->is_Con()
+                  && load->in(2)->in(3)->bottom_type()->is_intptr_t()->get_con() == marking_offset) {
+
+                Node* if_ctrl = iff->in(0);
+                Node* load_ctrl = load->in(0);
+
+                if (if_ctrl != load_ctrl) {
+                  // Skip possible CProj->NeverBranch in infinite loops
+                  if ((if_ctrl->is_Proj() && if_ctrl->Opcode() == Op_CProj)
+                      && (if_ctrl->in(0)->is_MultiBranch() && if_ctrl->in(0)->Opcode() == Op_NeverBranch)) {
+                    if_ctrl = if_ctrl->in(0)->in(0);
+                  }
+                }
+                assert(load_ctrl != NULL && if_ctrl == load_ctrl, "controls must match");
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}
+
 #endif
 
 // The Compile object keeps track of failure reasons separately from the ciEnv.

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

@@ -1148,6 +1148,9 @@ class Compile : public Phase {
   // graph is strongly connected from root in both directions.
   void verify_graph_edges(bool no_dead_code = false) PRODUCT_RETURN;
 
+  // Verify GC barrier patterns
+  void verify_barriers() PRODUCT_RETURN;
+
   // End-of-run dumps.
   static void print_statistics() PRODUCT_RETURN;
 

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

@@ -1964,7 +1964,7 @@ void PhaseIdealLoop::do_range_check( IdealLoopTree *loop, Node_List &old_new ) {
       // Find loads off the surviving projection; remove their control edge
       for (DUIterator_Fast imax, i = dp->fast_outs(imax); i < imax; i++) {
         Node* cd = dp->fast_out(i); // Control-dependent node
-        if( cd->is_Load() ) {   // Loads can now float around in the loop
+        if (cd->is_Load() && cd->depends_only_on_test()) {   // Loads can now float around in the loop
           // Allow the load to float around in the loop, or before it
           // but NOT before the pre-loop.
           _igvn.replace_input_of(cd, 0, ctrl); // ctrl, not NULL

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

@@ -204,6 +204,17 @@ public:
 protected:
   const Type* load_array_final_field(const TypeKlassPtr *tkls,
                                      ciKlass* klass) 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
+  // GC barriers, the control edge carries the dependence preventing hoisting past
+  // a Safepoint instead of the memory edge.  (An unfortunate consequence of having
+  // Safepoints not set Raw Memory; itself an unfortunate consequence of having Nodes
+  // which produce results (new raw memory state) inside of loops preventing all
+  // manner of other optimizations).  Basically, it's ugly but so is the alternative.
+  // See comment in macro.cpp, around line 125 expand_allocate_common().
+  virtual bool depends_only_on_test() const { return adr_type() != TypeRawPtr::BOTTOM; }
+
 };
 
 //------------------------------LoadBNode--------------------------------------
@@ -370,16 +381,6 @@ public:
   virtual uint ideal_reg() const { return Op_RegP; }
   virtual int store_Opcode() const { return Op_StoreP; }
   virtual BasicType memory_type() const { return T_ADDRESS; }
-  // 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, the control edge carries
-  // the dependence preventing hoisting past a Safepoint instead of the memory
-  // edge.  (An unfortunate consequence of having Safepoints not set Raw
-  // Memory; itself an unfortunate consequence of having Nodes which produce
-  // results (new raw memory state) inside of loops preventing all manner of
-  // other optimizations).  Basically, it's ugly but so is the alternative.
-  // See comment in macro.cpp, around line 125 expand_allocate_common().
-  virtual bool depends_only_on_test() const { return adr_type() != TypeRawPtr::BOTTOM; }
 };
 
 
@@ -393,16 +394,6 @@ public:
   virtual uint ideal_reg() const { return Op_RegN; }
   virtual int store_Opcode() const { return Op_StoreN; }
   virtual BasicType memory_type() const { return T_NARROWOOP; }
-  // 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, the control edge carries
-  // the dependence preventing hoisting past a Safepoint instead of the memory
-  // edge.  (An unfortunate consequence of having Safepoints not set Raw
-  // Memory; itself an unfortunate consequence of having Nodes which produce
-  // results (new raw memory state) inside of loops preventing all manner of
-  // other optimizations).  Basically, it's ugly but so is the alternative.
-  // See comment in macro.cpp, around line 125 expand_allocate_common().
-  virtual bool depends_only_on_test() const { return adr_type() != TypeRawPtr::BOTTOM; }
 };
 
 //------------------------------LoadKlassNode----------------------------------

hotspot/src/share/vm/prims/jvmtiImpl.cpp

@@ -210,6 +210,14 @@ void GrowableCache::oops_do(OopClosure* f) {
   }
 }
 
+void GrowableCache::metadata_do(void f(Metadata*)) {
+  int len = _elements->length();
+  for (int i=0; i<len; i++) {
+    GrowableElement *e = _elements->at(i);
+    e->metadata_do(f);
+  }
+}
+
 void GrowableCache::gc_epilogue() {
   int len = _elements->length();
   for (int i=0; i<len; i++) {
@@ -224,20 +232,20 @@ void GrowableCache::gc_epilogue() {
 JvmtiBreakpoint::JvmtiBreakpoint() {
   _method = NULL;
   _bci    = 0;
-  _class_loader = NULL;
+  _class_holder = NULL;
 }
 
 JvmtiBreakpoint::JvmtiBreakpoint(Method* m_method, jlocation location) {
   _method        = m_method;
-  _class_loader  = _method->method_holder()->class_loader_data()->class_loader();
+  _class_holder  = _method->method_holder()->klass_holder();
 #ifdef CHECK_UNHANDLED_OOPS
-  // _class_loader can't be wrapped in a Handle, because JvmtiBreakpoint:s are
+  // _class_holder can't be wrapped in a Handle, because JvmtiBreakpoints are
-  // eventually allocated on the heap.
+  // sometimes allocated on the heap.
   //
-  // The code handling JvmtiBreakpoint:s allocated on the stack can't be
+  // The code handling JvmtiBreakpoints allocated on the stack can't be
-  // interrupted by a GC until _class_loader is reachable by the GC via the
+  // interrupted by a GC until _class_holder is reachable by the GC via the
   // oops_do method.
-  Thread::current()->allow_unhandled_oop(&_class_loader);
+  Thread::current()->allow_unhandled_oop(&_class_holder);
 #endif // CHECK_UNHANDLED_OOPS
   assert(_method != NULL, "_method != NULL");
   _bci           = (int) location;
@@ -247,7 +255,7 @@ JvmtiBreakpoint::JvmtiBreakpoint(Method* m_method, jlocation location) {
 void JvmtiBreakpoint::copy(JvmtiBreakpoint& bp) {
   _method   = bp._method;
   _bci      = bp._bci;
-  _class_loader = bp._class_loader;
+  _class_holder = bp._class_holder;
 }
 
 bool JvmtiBreakpoint::lessThan(JvmtiBreakpoint& bp) {
@@ -365,6 +373,13 @@ void VM_ChangeBreakpoints::oops_do(OopClosure* f) {
   }
 }
 
+void VM_ChangeBreakpoints::metadata_do(void f(Metadata*)) {
+  // Walk metadata in breakpoints to keep from being deallocated with RedefineClasses
+  if (_bp != NULL) {
+    _bp->metadata_do(f);
+  }
+}
+
 //
 // class JvmtiBreakpoints
 //
@@ -381,6 +396,10 @@ void  JvmtiBreakpoints::oops_do(OopClosure* f) {
   _bps.oops_do(f);
 }
 
+void  JvmtiBreakpoints::metadata_do(void f(Metadata*)) {
+  _bps.metadata_do(f);
+}
+
 void JvmtiBreakpoints::gc_epilogue() {
   _bps.gc_epilogue();
 }
@@ -499,6 +518,12 @@ void JvmtiCurrentBreakpoints::oops_do(OopClosure* f) {
   }
 }
 
+void JvmtiCurrentBreakpoints::metadata_do(void f(Metadata*)) {
+  if (_jvmti_breakpoints != NULL) {
+    _jvmti_breakpoints->metadata_do(f);
+  }
+}
+
 void JvmtiCurrentBreakpoints::gc_epilogue() {
   if (_jvmti_breakpoints != NULL) {
     _jvmti_breakpoints->gc_epilogue();

hotspot/src/share/vm/prims/jvmtiImpl.hpp

@@ -69,6 +69,7 @@ public:
   virtual bool lessThan(GrowableElement *e)=0;
   virtual GrowableElement *clone()         =0;
   virtual void oops_do(OopClosure* f)      =0;
+  virtual void metadata_do(void f(Metadata*)) =0;
 };
 
 class GrowableCache VALUE_OBJ_CLASS_SPEC {
@@ -115,6 +116,8 @@ public:
   void clear();
   // apply f to every element and update the cache
   void oops_do(OopClosure* f);
+  // walk metadata to preserve for RedefineClasses
+  void metadata_do(void f(Metadata*));
   // update the cache after a full gc
   void gc_epilogue();
 };
@@ -148,6 +151,7 @@ public:
   void remove (int index)               { _cache.remove(index); }
   void clear()                          { _cache.clear(); }
   void oops_do(OopClosure* f)           { _cache.oops_do(f); }
+  void metadata_do(void f(Metadata*))   { _cache.metadata_do(f); }
   void gc_epilogue()                    { _cache.gc_epilogue(); }
 };
 
@@ -169,7 +173,7 @@ private:
   Method*               _method;
   int                   _bci;
   Bytecodes::Code       _orig_bytecode;
-  oop                   _class_loader;
+  oop                   _class_holder;  // keeps _method memory from being deallocated
 
 public:
   JvmtiBreakpoint();
@@ -191,9 +195,15 @@ public:
   bool lessThan(GrowableElement* e) { Unimplemented(); return false; }
   bool equals(GrowableElement* e) { return equals((JvmtiBreakpoint&) *e); }
   void oops_do(OopClosure* f)     {
-    // Mark the method loader as live
+    // Mark the method loader as live so the Method* class loader doesn't get
-    f->do_oop(&_class_loader);
+    // unloaded and Method* memory reclaimed.
+    f->do_oop(&_class_holder);
   }
+  void metadata_do(void f(Metadata*)) {
+    // walk metadata to preserve for RedefineClasses
+    f(_method);
+  }
+
   GrowableElement *clone()        {
     JvmtiBreakpoint *bp = new JvmtiBreakpoint();
     bp->copy(*this);
@@ -239,6 +249,7 @@ public:
 
   int length();
   void oops_do(OopClosure* f);
+  void metadata_do(void f(Metadata*));
   void print();
 
   int  set(JvmtiBreakpoint& bp);
@@ -288,6 +299,7 @@ public:
   static inline bool is_breakpoint(address bcp);
 
   static void oops_do(OopClosure* f);
+  static void metadata_do(void f(Metadata*));
   static void gc_epilogue();
 };
 
@@ -332,6 +344,7 @@ public:
   VMOp_Type type() const { return VMOp_ChangeBreakpoints; }
   void doit();
   void oops_do(OopClosure* f);
+  void metadata_do(void f(Metadata*));
 };
 
 

hotspot/test/compiler/intrinsics/mathexact/CompareTest.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2013, 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 8026722
+ * @summary Verify that the compare after addExact is a signed compare
+ * @compile CompareTest.java
+ * @run main CompareTest
+ *
+ */
+
+public class CompareTest {
+    public static long store = 0;
+    public static long addValue = 1231;
+
+    public static void main(String[] args) {
+        for (int i = 0; i < 20000; ++i) {
+            runTest(i, i);
+            runTest(i-1, i);
+        }
+    }
+
+    public static long create(long value, int v) {
+        if ((value | v) == 0) {
+            return 0;
+        }
+
+        // C2 turned this test into unsigned test when a control edge was set on the Cmp
+        if (value < -31557014167219200L || value > 31556889864403199L) {
+            throw new RuntimeException("error");
+        }
+
+        return value;
+    }
+
+    public static void runTest(long value, int value2) {
+        long res = Math.addExact(value, addValue);
+        store = create(res, Math.floorMod(value2, 100000));
+    }
+}

hotspot/test/compiler/intrinsics/stringequals/TestStringEqualsBadLength.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2013, 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 8027445
+ * @summary String.equals() may be called with a length whose upper bits are not cleared
+ * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation TestStringEqualsBadLength
+ *
+ */
+
+import java.util.Arrays;
+
+public class TestStringEqualsBadLength {
+
+    int v1;
+    int v2;
+
+    boolean m(String s1) {
+        int l = v2 - v1; // 0 - (-1) = 1. On 64 bit: 0xffffffff00000001
+        char[] arr = new char[l];
+        arr[0] = 'a';
+        String s2 = new String(arr);
+        // The string length is not reloaded but the value computed is
+        // reused so pointer computation must not use
+        // 0xffffffff00000001
+        return s2.equals(s1);
+    }
+
+    // Same thing with String.compareTo()
+    int m2(String s1) {
+        int l = v2 - v1;
+        char[] arr = new char[l+1];
+        arr[0] = 'a';
+        arr[1] = 'b';
+        String s2 = new String(arr);
+        return s2.compareTo(s1);
+    }
+
+    // Same thing with equals() for arrays
+    boolean m3(char[] arr1) {
+        int l = v2 - v1; // 0 - (-1) = 1. On 64 bit: 0xffffffff00000001
+        char[] arr2 = new char[l];
+        arr2[0] = 'a';
+        return Arrays.equals(arr2, arr1);
+    }
+
+    static public void main(String[] args) {
+        TestStringEqualsBadLength tse = new TestStringEqualsBadLength();
+        tse.v1 = -1;
+        tse.v2 = 0;
+        char[] arr = new char[1];
+        arr[0] = 'a';
+        for (int i = 0; i < 20000; i++) {
+            tse.m("a");
+            tse.m2("ab");
+            tse.m3(arr);
+        }
+
+        System.out.println("TEST PASSED");
+    }
+}

hotspot/test/compiler/regalloc/C1ObjectSpillInLogicOp.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2013, 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 8027751
+ * @summary C1 crashes generating G1 post-barrier in Unsafe.getAndSetObject() intrinsic because of the new value spill
+ * @run main/othervm -XX:+UseG1GC C1ObjectSpillInLogicOp
+ *
+ * G1 barriers use logical operators (xor) on T_OBJECT mixed with T_LONG or T_INT.
+ * The current implementation of logical operations on x86 in C1 doesn't allow for long operands to be on stack.
+ * There is a special code in the register allocator that forces long arguments in registers on x86. However T_OBJECT
+ * can be spilled just fine, and in that case the xor emission will fail.
+ */
+
+import java.util.concurrent.atomic.*;
+class C1ObjectSpillInLogicOp {
+  static public void main(String[] args) {
+    AtomicReferenceArray<Integer> x = new AtomicReferenceArray(128);
+    Integer y = new Integer(0);
+    for (int i = 0; i < 50000; i++) {
+      x.getAndSet(i % x.length(), y);
+    }
+  }
+}

make/scripts/webrev.ksh

@@ -27,7 +27,7 @@
 # Documentation is available via 'webrev -h'.
 #
 
-WEBREV_UPDATED=25.0-hg+openjdk.java.net
+WEBREV_UPDATED=25.1-hg+openjdk.java.net
 
 HTML='<?xml version="1.0"?>
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
@@ -1686,19 +1686,20 @@ function build_old_new_mercurial
 	    # It's a rename (or a move), or a copy, so let's make sure we move
 	    # to the right directory first, then restore it once done
 	    current_dir=`pwd`
-	    cd $CWS/$PDIR
+	    hg_root=`hg root`
+	    cd $CWS
 	    if [ -n "$rflag" ]; then
 		parentrev=$PARENT_REV
 	    elif [ "$HG_LIST_FROM_COMMIT" -eq 1 ]; then
                 parentrev=$OUTREV
 	    fi
 	    if [ -z "$parentrev" ]; then
-		parentrev=`hg log -l1 $PF | $AWK -F: '/changeset/ {print $2}'`
+		parentrev=`hg log -l1 $PDIR/$PF | $AWK -F: '/changeset/ {print $2}'`
 	    fi
 	    if [ -n "$parentrev" ]; then
 		mkdir -p $olddir/$PDIR
 		if [ -z "$parent" ]; then
-		    hg cat --rev $parentrev --output $olddir/$PDIR/$PF $PF 2>/dev/null
+		    hg cat -R $hg_root --rev $parentrev --output $olddir/$PDIR/$PF $PDIR/$PF 2>/dev/null
 		else
 		    $parent cat --rev $parentrev --output $olddir/$PDIR/$PF $PDIR/$PF 2>/dev/null
 		fi