--- a/hotspot/src/cpu/sparc/vm/stubGenerator_sparc.cpp	Tue Dec 04 16:28:18 2007 -0800
+++ b/hotspot/src/cpu/sparc/vm/stubGenerator_sparc.cpp	Wed Dec 05 09:00:00 2007 -0800
@@ -2911,6 +2911,7 @@
 
     // These entry points require SharedInfo::stack0 to be set up in non-core builds
     StubRoutines::_throw_AbstractMethodError_entry         = generate_throw_exception("AbstractMethodError throw_exception",          CAST_FROM_FN_PTR(address, SharedRuntime::throw_AbstractMethodError),  false);
+    StubRoutines::_throw_IncompatibleClassChangeError_entry= generate_throw_exception("IncompatibleClassChangeError throw_exception", CAST_FROM_FN_PTR(address, SharedRuntime::throw_IncompatibleClassChangeError),  false);
     StubRoutines::_throw_ArithmeticException_entry         = generate_throw_exception("ArithmeticException throw_exception",          CAST_FROM_FN_PTR(address, SharedRuntime::throw_ArithmeticException),  true);
     StubRoutines::_throw_NullPointerException_entry        = generate_throw_exception("NullPointerException throw_exception",         CAST_FROM_FN_PTR(address, SharedRuntime::throw_NullPointerException), true);
     StubRoutines::_throw_NullPointerException_at_call_entry= generate_throw_exception("NullPointerException at call throw_exception", CAST_FROM_FN_PTR(address, SharedRuntime::throw_NullPointerException_at_call), false);

--- a/hotspot/src/cpu/sparc/vm/vtableStubs_sparc.cpp	Tue Dec 04 16:28:18 2007 -0800
+++ b/hotspot/src/cpu/sparc/vm/vtableStubs_sparc.cpp	Wed Dec 05 09:00:00 2007 -0800
@@ -175,17 +175,12 @@
   // %%%% Could load both offset and interface in one ldx, if they were
   // in the opposite order.  This would save a load.
   __ ld_ptr(L0, base + itableOffsetEntry::interface_offset_in_bytes(), L1);
-#ifdef ASSERT
-  Label ok;
-  // Check that entry is non-null and an Oop
-  __ bpr(Assembler::rc_nz, false, Assembler::pt, L1, ok);
-  __ delayed()->nop();
-  __ stop("null entry point found in itable's offset table");
-  __ bind(ok);
-  __ verify_oop(L1);
-#endif // ASSERT
 
-  __ cmp(G5_interface, L1);
+  // If the entry is NULL then we've reached the end of the table
+  // without finding the expected interface, so throw an exception
+  Label throw_icce;
+  __ bpr(Assembler::rc_z, false, Assembler::pn, L1, throw_icce);
+  __ delayed()->cmp(G5_interface, L1);
   __ brx(Assembler::notEqual, true, Assembler::pn, search);
   __ delayed()->add(L0, itableOffsetEntry::size() * wordSize, L0);
 
@@ -223,24 +218,30 @@
   __ JMP(G3_scratch, 0);
   __ delayed()->nop();
 
+  __ bind(throw_icce);
+  Address icce(G3_scratch, StubRoutines::throw_IncompatibleClassChangeError_entry());
+  __ jump_to(icce, 0);
+  __ delayed()->restore();
+
   masm->flush();
+
+  guarantee(__ pc() <= s->code_end(), "overflowed buffer");
+
   s->set_exception_points(npe_addr, ame_addr);
   return s;
 }
 
 
 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
-  if (TraceJumps || DebugVtables || CountCompiledCalls || VerifyOops) return 999;
+  if (TraceJumps || DebugVtables || CountCompiledCalls || VerifyOops) return 1000;
   else {
     const int slop = 2*BytesPerInstWord; // sethi;add  (needed for long offsets)
     if (is_vtable_stub) {
       const int basic = 5*BytesPerInstWord; // ld;ld;ld,jmp,nop
       return basic + slop;
     } else {
-#ifdef ASSERT
-      return 999;
-#endif // ASSERT
-      const int basic = 17*BytesPerInstWord; // save, ld, ld, sll, and, add, add, ld, cmp, br, add, ld, add, ld, ld, jmp, restore
+      // save, ld, ld, sll, and, add, add, ld, cmp, br, add, ld, add, ld, ld, jmp, restore, sethi, jmpl, restore
+      const int basic = (20 LP64_ONLY(+ 6)) * BytesPerInstWord;
       return (basic + slop);
     }
   }
@@ -252,29 +253,3 @@
   const unsigned int icache_line_size = 32;
   return icache_line_size;
 }
-
-
-//Reconciliation History
-// 1.2 97/12/09 17:13:31 vtableStubs_i486.cpp
-// 1.4 98/01/21 19:18:37 vtableStubs_i486.cpp
-// 1.5 98/02/13 16:33:55 vtableStubs_i486.cpp
-// 1.7 98/03/05 17:17:28 vtableStubs_i486.cpp
-// 1.9 98/05/18 09:26:17 vtableStubs_i486.cpp
-// 1.10 98/05/26 16:28:13 vtableStubs_i486.cpp
-// 1.11 98/05/27 08:51:35 vtableStubs_i486.cpp
-// 1.12 98/06/15 15:04:12 vtableStubs_i486.cpp
-// 1.13 98/07/28 18:44:22 vtableStubs_i486.cpp
-// 1.15 98/08/28 11:31:19 vtableStubs_i486.cpp
-// 1.16 98/09/02 12:58:31 vtableStubs_i486.cpp
-// 1.17 98/09/04 12:15:52 vtableStubs_i486.cpp
-// 1.18 98/11/19 11:55:24 vtableStubs_i486.cpp
-// 1.19 99/01/12 14:57:56 vtableStubs_i486.cpp
-// 1.20 99/01/19 17:42:52 vtableStubs_i486.cpp
-// 1.22 99/01/21 10:29:25 vtableStubs_i486.cpp
-// 1.30 99/06/02 15:27:39 vtableStubs_i486.cpp
-// 1.26 99/06/24 14:25:07 vtableStubs_i486.cpp
-// 1.23 99/02/22 14:37:52 vtableStubs_i486.cpp
-// 1.28 99/06/29 18:06:17 vtableStubs_i486.cpp
-// 1.29 99/07/22 17:03:44 vtableStubs_i486.cpp
-// 1.30 99/08/11 09:33:27 vtableStubs_i486.cpp
-//End

--- a/hotspot/src/cpu/x86/vm/stubGenerator_x86_32.cpp	Tue Dec 04 16:28:18 2007 -0800
+++ b/hotspot/src/cpu/x86/vm/stubGenerator_x86_32.cpp	Wed Dec 05 09:00:00 2007 -0800
@@ -2151,6 +2151,7 @@
     // These entry points require SharedInfo::stack0 to be set up in non-core builds
     // and need to be relocatable, so they each fabricate a RuntimeStub internally.
     StubRoutines::_throw_AbstractMethodError_entry         = generate_throw_exception("AbstractMethodError throw_exception",          CAST_FROM_FN_PTR(address, SharedRuntime::throw_AbstractMethodError),  false);
+    StubRoutines::_throw_IncompatibleClassChangeError_entry= generate_throw_exception("IncompatibleClassChangeError throw_exception", CAST_FROM_FN_PTR(address, SharedRuntime::throw_IncompatibleClassChangeError),  false);
     StubRoutines::_throw_ArithmeticException_entry         = generate_throw_exception("ArithmeticException throw_exception",          CAST_FROM_FN_PTR(address, SharedRuntime::throw_ArithmeticException),  true);
     StubRoutines::_throw_NullPointerException_entry        = generate_throw_exception("NullPointerException throw_exception",         CAST_FROM_FN_PTR(address, SharedRuntime::throw_NullPointerException), true);
     StubRoutines::_throw_NullPointerException_at_call_entry= generate_throw_exception("NullPointerException at call throw_exception", CAST_FROM_FN_PTR(address, SharedRuntime::throw_NullPointerException_at_call), false);

--- a/hotspot/src/cpu/x86/vm/stubGenerator_x86_64.cpp	Tue Dec 04 16:28:18 2007 -0800
+++ b/hotspot/src/cpu/x86/vm/stubGenerator_x86_64.cpp	Wed Dec 05 09:00:00 2007 -0800
@@ -2832,6 +2832,13 @@
                                                 throw_AbstractMethodError),
                                false);
 
+    StubRoutines::_throw_IncompatibleClassChangeError_entry =
+      generate_throw_exception("IncompatibleClassChangeError throw_exception",
+                               CAST_FROM_FN_PTR(address,
+                                                SharedRuntime::
+                                                throw_IncompatibleClassChangeError),
+                               false);
+
     StubRoutines::_throw_ArithmeticException_entry =
       generate_throw_exception("ArithmeticException throw_exception",
                                CAST_FROM_FN_PTR(address,

--- a/hotspot/src/cpu/x86/vm/vtableStubs_x86_32.cpp	Tue Dec 04 16:28:18 2007 -0800
+++ b/hotspot/src/cpu/x86/vm/vtableStubs_x86_32.cpp	Wed Dec 05 09:00:00 2007 -0800
@@ -138,29 +138,21 @@
     __ round_to(rbx, BytesPerLong);
   }
 
-  Label hit, next, entry;
+  Label hit, next, entry, throw_icce;
 
-  __ jmp(entry);
+  __ jmpb(entry);
 
   __ bind(next);
   __ addl(rbx, itableOffsetEntry::size() * wordSize);
 
   __ bind(entry);
 
-#ifdef ASSERT
-    // Check that the entry is non-null
-  if (DebugVtables) {
-    Label L;
-    __ pushl(rbx);
-    __ movl(rbx, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
-    __ testl(rbx, rbx);
-    __ jcc(Assembler::notZero, L);
-    __ stop("null entry point found in itable's offset table");
-    __ bind(L);
-    __ popl(rbx);
-  }
-#endif
-  __ cmpl(rax, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
+  // If the entry is NULL then we've reached the end of the table
+  // without finding the expected interface, so throw an exception
+  __ movl(rdx, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
+  __ testl(rdx, rdx);
+  __ jcc(Assembler::zero, throw_icce);
+  __ cmpl(rax, rdx);
   __ jcc(Assembler::notEqual, next);
 
   // We found a hit, move offset into rbx,
@@ -194,7 +186,15 @@
   address ame_addr = __ pc();
   __ jmp(Address(method, methodOopDesc::from_compiled_offset()));
 
+  __ bind(throw_icce);
+  // Restore saved register
+  __ popl(rdx);
+  __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
+
   masm->flush();
+
+  guarantee(__ pc() <= s->code_end(), "overflowed buffer");
+
   s->set_exception_points(npe_addr, ame_addr);
   return s;
 }
@@ -207,7 +207,7 @@
     return (DebugVtables ? 210 : 16) + (CountCompiledCalls ? 6 : 0);
   } else {
     // Itable stub size
-    return (DebugVtables ? 140 : 55) + (CountCompiledCalls ? 6 : 0);
+    return (DebugVtables ? 144 : 64) + (CountCompiledCalls ? 6 : 0);
   }
 }
 

--- a/hotspot/src/cpu/x86/vm/vtableStubs_x86_64.cpp	Tue Dec 04 16:28:18 2007 -0800
+++ b/hotspot/src/cpu/x86/vm/vtableStubs_x86_64.cpp	Wed Dec 05 09:00:00 2007 -0800
@@ -153,7 +153,7 @@
     // Round up to align_object_offset boundary
     __ round_to_q(rbx, BytesPerLong);
   }
-  Label hit, next, entry;
+  Label hit, next, entry, throw_icce;
 
   __ jmpb(entry);
 
@@ -162,22 +162,13 @@
 
   __ bind(entry);
 
-#ifdef ASSERT
-    // Check that the entry is non-null
-  if (DebugVtables) {
-    Label L;
-    __ pushq(rbx);
-    __ movq(rbx, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
-    __ testq(rbx, rbx);
-    __ jcc(Assembler::notZero, L);
-    __ stop("null entry point found in itable's offset table");
-    __ bind(L);
-    __ popq(rbx);
-  }
-#endif
-
-  __ cmpq(rax, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
-  __ jcc(Assembler::notEqual, next);
+  // If the entry is NULL then we've reached the end of the table
+  // without finding the expected interface, so throw an exception
+  __ movq(j_rarg1, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
+  __ testq(j_rarg1, j_rarg1);
+  __ jcc(Assembler::zero, throw_icce);
+  __ cmpq(rax, j_rarg1);
+  __ jccb(Assembler::notEqual, next);
 
   // We found a hit, move offset into j_rarg1
   __ movl(j_rarg1, Address(rbx, itableOffsetEntry::offset_offset_in_bytes()));
@@ -203,23 +194,31 @@
 
 
 #ifdef ASSERT
-    if (DebugVtables) {
-      Label L2;
-      __ cmpq(method, (int)NULL);
-      __ jcc(Assembler::equal, L2);
-      __ cmpq(Address(method, methodOopDesc::from_compiled_offset()), (int)NULL_WORD);
-      __ jcc(Assembler::notZero, L2);
-      __ stop("compiler entrypoint is null");
-      __ bind(L2);
-    }
+  if (DebugVtables) {
+    Label L2;
+    __ cmpq(method, (int)NULL);
+    __ jcc(Assembler::equal, L2);
+    __ cmpq(Address(method, methodOopDesc::from_compiled_offset()), (int)NULL_WORD);
+    __ jcc(Assembler::notZero, L2);
+    __ stop("compiler entrypoint is null");
+    __ bind(L2);
+  }
 #endif // ASSERT
 
-    // rbx: methodOop
-    // j_rarg0: receiver
-    address ame_addr = __ pc();
-    __ jmp(Address(method, methodOopDesc::from_compiled_offset()));
+  // rbx: methodOop
+  // j_rarg0: receiver
+  address ame_addr = __ pc();
+  __ jmp(Address(method, methodOopDesc::from_compiled_offset()));
+
+  __ bind(throw_icce);
+  // Restore saved register
+  __ popq(j_rarg1);
+  __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
 
   __ flush();
+
+  guarantee(__ pc() <= s->code_end(), "overflowed buffer");
+
   s->set_exception_points(npe_addr, ame_addr);
   return s;
 }
@@ -230,7 +229,7 @@
     return (DebugVtables ? 512 : 24) + (CountCompiledCalls ? 13 : 0);
   } else {
     // Itable stub size
-    return (DebugVtables ? 636 : 64) + (CountCompiledCalls ? 13 : 0);
+    return (DebugVtables ? 636 : 72) + (CountCompiledCalls ? 13 : 0);
   }
 }
 

--- a/hotspot/src/share/vm/oops/klassVtable.cpp	Tue Dec 04 16:28:18 2007 -0800
+++ b/hotspot/src/share/vm/oops/klassVtable.cpp	Wed Dec 05 09:00:00 2007 -0800
@@ -735,7 +735,7 @@
     }
   }
 
-  // This lenght of the itable was either zero, or it has not yet been initialized.
+  // The length of the itable was either zero, or it has not yet been initialized.
   _table_offset      = 0;
   _size_offset_table = 0;
   _size_method_table = 0;
@@ -870,16 +870,19 @@
 
 // Initialization
 void klassItable::initialize_itable(bool checkconstraints, TRAPS) {
-  // Cannot be setup doing bootstrapping
-  if (Universe::is_bootstrapping()) return;
+  // Cannot be setup doing bootstrapping, interfaces don't have
+  // itables, and klass with only ones entry have empty itables
+  if (Universe::is_bootstrapping() ||
+      _klass->is_interface() ||
+      _klass->itable_length() == itableOffsetEntry::size()) return;
 
-  int num_interfaces = nof_interfaces();
+  // There's alway an extra itable entry so we can null-terminate it.
+  guarantee(size_offset_table() >= 1, "too small");
+  int num_interfaces = size_offset_table() - 1;
   if (num_interfaces > 0) {
-    if (TraceItables) tty->print_cr("%3d: Initializing itables for %s", ++initialize_count, _klass->name()->as_C_string());
+    if (TraceItables) tty->print_cr("%3d: Initializing itables for %s", ++initialize_count,
+                                    _klass->name()->as_C_string());
 
-    // In debug mode, we got an extra NULL/NULL entry
-    debug_only(num_interfaces--);
-    assert(num_interfaces > 0, "to few interfaces in offset itable");
 
     // Interate through all interfaces
     int i;
@@ -890,12 +893,10 @@
       initialize_itable_for_interface(ioe->offset(), interf_h, checkconstraints, CHECK);
     }
 
-#ifdef ASSERT
-    // Check that the last entry is empty
-    itableOffsetEntry* ioe = offset_entry(i);
-    assert(ioe->interface_klass() == NULL && ioe->offset() == 0, "terminator entry missing");
-#endif
   }
+  // Check that the last entry is empty
+  itableOffsetEntry* ioe = offset_entry(size_offset_table() - 1);
+  guarantee(ioe->interface_klass() == NULL && ioe->offset() == 0, "terminator entry missing");
 }
 
 
@@ -972,7 +973,7 @@
   }
 }
 
-// Update entry for specic methodOop
+// Update entry for specific methodOop
 void klassItable::initialize_with_method(methodOop m) {
   itableMethodEntry* ime = method_entry(0);
   for(int i = 0; i < _size_method_table; i++) {
@@ -1085,12 +1086,8 @@
   CountInterfacesClosure cic;
   visit_all_interfaces(transitive_interfaces(), &cic);
 
-  // Add one extra entry in debug mode, so we can null-terminate the table
-  int nof_methods    = cic.nof_methods();
-  int nof_interfaces = cic.nof_interfaces();
-  debug_only(if (nof_interfaces > 0) nof_interfaces++);
-
-  int itable_size = calc_itable_size(nof_interfaces, nof_methods);
+  // There's alway an extra itable entry so we can null-terminate it.
+  int itable_size = calc_itable_size(cic.nof_interfaces() + 1, cic.nof_methods());
 
   // Statistics
   update_stats(itable_size * HeapWordSize);
@@ -1110,8 +1107,8 @@
   int nof_methods    = cic.nof_methods();
   int nof_interfaces = cic.nof_interfaces();
 
-  // Add one extra entry in debug mode, so we can null-terminate the table
-  debug_only(if (nof_interfaces > 0) nof_interfaces++);
+  // Add one extra entry so we can null-terminate the table
+  nof_interfaces++;
 
   assert(compute_itable_size(objArrayHandle(klass->transitive_interfaces())) ==
          calc_itable_size(nof_interfaces, nof_methods),

--- a/hotspot/src/share/vm/oops/klassVtable.hpp	Tue Dec 04 16:28:18 2007 -0800
+++ b/hotspot/src/share/vm/oops/klassVtable.hpp	Wed Dec 05 09:00:00 2007 -0800
@@ -259,7 +259,7 @@
   itableMethodEntry* method_entry(int i) { assert(0 <= i && i <= _size_method_table, "index out of bounds");
                                            return &((itableMethodEntry*)method_start())[i]; }
 
-  int nof_interfaces()                   { return _size_offset_table; }
+  int size_offset_table()                { return _size_offset_table; }
 
   // Initialization
   void initialize_itable(bool checkconstraints, TRAPS);

--- a/hotspot/src/share/vm/runtime/sharedRuntime.cpp	Tue Dec 04 16:28:18 2007 -0800
+++ b/hotspot/src/share/vm/runtime/sharedRuntime.cpp	Wed Dec 05 09:00:00 2007 -0800
@@ -467,6 +467,11 @@
   throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError());
 JRT_END
 
+JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
+  // These errors occur only at call sites
+  throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub");
+JRT_END
+
 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread))
   throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
 JRT_END

--- a/hotspot/src/share/vm/runtime/sharedRuntime.hpp	Tue Dec 04 16:28:18 2007 -0800
+++ b/hotspot/src/share/vm/runtime/sharedRuntime.hpp	Wed Dec 05 09:00:00 2007 -0800
@@ -104,6 +104,7 @@
     STACK_OVERFLOW
   };
   static void    throw_AbstractMethodError(JavaThread* thread);
+  static void    throw_IncompatibleClassChangeError(JavaThread* thread);
   static void    throw_ArithmeticException(JavaThread* thread);
   static void    throw_NullPointerException(JavaThread* thread);
   static void    throw_NullPointerException_at_call(JavaThread* thread);

--- a/hotspot/src/share/vm/runtime/stubRoutines.cpp	Tue Dec 04 16:28:18 2007 -0800
+++ b/hotspot/src/share/vm/runtime/stubRoutines.cpp	Wed Dec 05 09:00:00 2007 -0800
@@ -40,6 +40,7 @@
 address StubRoutines::_catch_exception_entry                    = NULL;
 address StubRoutines::_forward_exception_entry                  = NULL;
 address StubRoutines::_throw_AbstractMethodError_entry          = NULL;
+address StubRoutines::_throw_IncompatibleClassChangeError_entry = NULL;
 address StubRoutines::_throw_ArithmeticException_entry          = NULL;
 address StubRoutines::_throw_NullPointerException_entry         = NULL;
 address StubRoutines::_throw_NullPointerException_at_call_entry = NULL;

--- a/hotspot/src/share/vm/runtime/stubRoutines.hpp	Tue Dec 04 16:28:18 2007 -0800
+++ b/hotspot/src/share/vm/runtime/stubRoutines.hpp	Wed Dec 05 09:00:00 2007 -0800
@@ -84,6 +84,7 @@
   static address _forward_exception_entry;
   static address _catch_exception_entry;
   static address _throw_AbstractMethodError_entry;
+  static address _throw_IncompatibleClassChangeError_entry;
   static address _throw_ArithmeticException_entry;
   static address _throw_NullPointerException_entry;
   static address _throw_NullPointerException_at_call_entry;
@@ -184,6 +185,7 @@
   static address forward_exception_entry()                 { return _forward_exception_entry; }
   // Implicit exceptions
   static address throw_AbstractMethodError_entry()         { return _throw_AbstractMethodError_entry; }
+  static address throw_IncompatibleClassChangeError_entry(){ return _throw_IncompatibleClassChangeError_entry; }
   static address throw_ArithmeticException_entry()         { return _throw_ArithmeticException_entry; }
   static address throw_NullPointerException_entry()        { return _throw_NullPointerException_entry; }
   static address throw_NullPointerException_at_call_entry(){ return _throw_NullPointerException_at_call_entry; }