8136525: Generate interpreter entries only once and avoid unnecessary jump to jump

Reviewed-by: coleenp, twisti, aph

hotspot/src/cpu/aarch64/vm/interp_masm_aarch64.cpp

@@ -42,6 +42,11 @@
 
 // Implementation of InterpreterMacroAssembler
 
+void InterpreterMacroAssembler::jump_to_entry(address entry) {
+  assert(entry, "Entry must have been generated by now");
+  b(entry);
+}
+
 #ifndef CC_INTERP
 
 void InterpreterMacroAssembler::check_and_handle_popframe(Register java_thread) {

hotspot/src/cpu/aarch64/vm/interp_masm_aarch64.hpp

@@ -66,6 +66,8 @@ class InterpreterMacroAssembler: public MacroAssembler {
 
   void load_earlyret_value(TosState state);
 
+  void jump_to_entry(address entry);
+
 #ifdef CC_INTERP
   void save_bcp()                                          { /*  not needed in c++ interpreter and harmless */ }
   void restore_bcp()                                       { /*  not needed in c++ interpreter and harmless */ }

hotspot/src/cpu/aarch64/vm/interpreterGenerator_aarch64.hpp

@@ -41,9 +41,8 @@ private:
   address generate_native_entry(bool synchronized);
   address generate_abstract_entry(void);
   address generate_math_entry(AbstractInterpreter::MethodKind kind);
-  address generate_jump_to_normal_entry(void);
+  address generate_accessor_entry(void) { return NULL; }
-  address generate_accessor_entry(void) { return generate_jump_to_normal_entry(); }
+  address generate_empty_entry(void) { return NULL; }
-  address generate_empty_entry(void) { return generate_jump_to_normal_entry(); }
   void generate_transcendental_entry(AbstractInterpreter::MethodKind kind, int fpargs);
   address generate_Reference_get_entry();
   address generate_CRC32_update_entry();

hotspot/src/cpu/aarch64/vm/interpreter_aarch64.cpp

@@ -236,17 +236,6 @@ void InterpreterGenerator::generate_transcendental_entry(AbstractInterpreter::Me
   __ blrt(rscratch1, gpargs, fpargs, rtype);
 }
 
-// Jump into normal path for accessor and empty entry to jump to normal entry
-// The "fast" optimization don't update compilation count therefore can disable inlining
-// for these functions that should be inlined.
-address InterpreterGenerator::generate_jump_to_normal_entry(void) {
-  address entry_point = __ pc();
-
-  assert(Interpreter::entry_for_kind(Interpreter::zerolocals) != NULL, "should already be generated");
-  __ b(Interpreter::entry_for_kind(Interpreter::zerolocals));
-  return entry_point;
-}
-
 // Abstract method entry
 // Attempt to execute abstract method. Throw exception
 address InterpreterGenerator::generate_abstract_entry(void) {

hotspot/src/cpu/aarch64/vm/templateInterpreter_aarch64.cpp

@@ -721,8 +721,7 @@ address InterpreterGenerator::generate_Reference_get_entry(void) {
 
     // generate a vanilla interpreter entry as the slow path
     __ bind(slow_path);
-    (void) generate_normal_entry(false);
+    __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::zerolocals));
-
     return entry;
   }
 #endif // INCLUDE_ALL_GCS
@@ -779,12 +778,10 @@ address InterpreterGenerator::generate_CRC32_update_entry() {
 
     // generate a vanilla native entry as the slow path
     __ bind(slow_path);
-
+    __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native));
-    (void) generate_native_entry(false);
-
     return entry;
   }
-  return generate_native_entry(false);
+  return NULL;
 }
 
 /**
@@ -841,12 +838,10 @@ address InterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpret
 
     // generate a vanilla native entry as the slow path
     __ bind(slow_path);
-
+    __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native));
-    (void) generate_native_entry(false);
-
     return entry;
   }
-  return generate_native_entry(false);
+  return NULL;
 }
 
 void InterpreterGenerator::bang_stack_shadow_pages(bool native_call) {

hotspot/src/cpu/ppc/vm/interp_masm_ppc_64.cpp

@@ -46,7 +46,7 @@ void InterpreterMacroAssembler::null_check_throw(Register a, int offset, Registe
   MacroAssembler::null_check_throw(a, offset, temp_reg, exception_entry);
 }
 
-void InterpreterMacroAssembler::branch_to_entry(address entry, Register Rscratch) {
+void InterpreterMacroAssembler::jump_to_entry(address entry, Register Rscratch) {
   assert(entry, "Entry must have been generated by now");
   if (is_within_range_of_b(entry, pc())) {
     b(entry);

hotspot/src/cpu/ppc/vm/interp_masm_ppc_64.hpp

@@ -39,7 +39,7 @@ class InterpreterMacroAssembler: public MacroAssembler {
 
   void null_check_throw(Register a, int offset, Register temp_reg);
 
-  void branch_to_entry(address entry, Register Rscratch);
+  void jump_to_entry(address entry, Register Rscratch);
 
   // Handy address generation macros.
 #define thread_(field_name) in_bytes(JavaThread::field_name ## _offset()), R16_thread

hotspot/src/cpu/ppc/vm/interpreterGenerator_ppc.hpp

@@ -31,9 +31,8 @@
  private:
 
   address generate_abstract_entry(void);
-  address generate_jump_to_normal_entry(void);
+  address generate_accessor_entry(void) { return NULL; }
-  address generate_accessor_entry(void) { return generate_jump_to_normal_entry(); }
+  address generate_empty_entry(void) { return NULL; }
-  address generate_empty_entry(void) { return generate_jump_to_normal_entry(); }
   address generate_Reference_get_entry(void);
 
   address generate_CRC32_update_entry();

hotspot/src/cpu/ppc/vm/interpreter_ppc.cpp

@@ -427,18 +427,6 @@ address AbstractInterpreterGenerator::generate_result_handler_for(BasicType type
   return entry;
 }
 
-// Call an accessor method (assuming it is resolved, otherwise drop into
-// vanilla (slow path) entry.
-address InterpreterGenerator::generate_jump_to_normal_entry(void) {
-  address entry = __ pc();
-  address normal_entry = Interpreter::entry_for_kind(Interpreter::zerolocals);
-  assert(normal_entry != NULL, "should already be generated.");
-  __ branch_to_entry(normal_entry, R11_scratch1);
-  __ flush();
-
-  return entry;
-}
-
 // Abstract method entry.
 //
 address InterpreterGenerator::generate_abstract_entry(void) {
@@ -529,12 +517,12 @@ address InterpreterGenerator::generate_Reference_get_entry(void) {
   //   regular method entry code to generate the NPE.
   //
 
+  if (UseG1GC) {
     address entry = __ pc();
 
     const int referent_offset = java_lang_ref_Reference::referent_offset;
     guarantee(referent_offset > 0, "referent offset not initialized");
 
-  if (UseG1GC) {
     Label slow_path;
 
     // Debugging not possible, so can't use __ skip_if_jvmti_mode(slow_path, GR31_SCRATCH);
@@ -577,13 +565,11 @@ address InterpreterGenerator::generate_Reference_get_entry(void) {
 
     // Generate regular method entry.
     __ bind(slow_path);
-    __ branch_to_entry(Interpreter::entry_for_kind(Interpreter::zerolocals), R11_scratch1);
+    __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::zerolocals), R11_scratch1);
-    __ flush();
-
     return entry;
-  } else {
-    return generate_jump_to_normal_entry();
   }
+
+  return NULL;
 }
 
 void Deoptimization::unwind_callee_save_values(frame* f, vframeArray* vframe_array) {

hotspot/src/cpu/ppc/vm/templateInterpreter_ppc.cpp

@@ -620,7 +620,7 @@ inline bool math_entry_available(AbstractInterpreter::MethodKind kind) {
 address TemplateInterpreterGenerator::generate_math_entry(AbstractInterpreter::MethodKind kind) {
   if (!math_entry_available(kind)) {
     NOT_PRODUCT(__ should_not_reach_here();)
-    return Interpreter::entry_for_kind(Interpreter::zerolocals);
+    return NULL;
   }
 
   address entry = __ pc();
@@ -1126,14 +1126,6 @@ address TemplateInterpreterGenerator::generate_normal_entry(bool synchronized) {
 
   generate_fixed_frame(false, Rsize_of_parameters, Rsize_of_locals);
 
-#ifdef FAST_DISPATCH
-  __ unimplemented("Fast dispatch in generate_normal_entry");
-#if 0
-  __ set((intptr_t)Interpreter::dispatch_table(), IdispatchTables);
-  // Set bytecode dispatch table base.
-#endif
-#endif
-
   // --------------------------------------------------------------------------
   // Zero out non-parameter locals.
   // Note: *Always* zero out non-parameter locals as Sparc does. It's not
@@ -1266,9 +1258,8 @@ address TemplateInterpreterGenerator::generate_normal_entry(bool synchronized) {
  *   int java.util.zip.CRC32.update(int crc, int b)
  */
 address InterpreterGenerator::generate_CRC32_update_entry() {
-  address start = __ pc();  // Remember stub start address (is rtn value).
-
   if (UseCRC32Intrinsics) {
+    address start = __ pc();  // Remember stub start address (is rtn value).
     Label slow_path;
 
     // Safepoint check
@@ -1313,11 +1304,11 @@ address InterpreterGenerator::generate_CRC32_update_entry() {
     // Generate a vanilla native entry as the slow path.
     BLOCK_COMMENT("} CRC32_update");
     BIND(slow_path);
+    __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native), R11_scratch1);
+    return start;
   }
 
-  (void) generate_native_entry(false);
+  return NULL;
-
-  return start;
 }
 
 // CRC32 Intrinsics.
@@ -1327,9 +1318,8 @@ address InterpreterGenerator::generate_CRC32_update_entry() {
  *   int java.util.zip.CRC32.updateByteBuffer(int crc, long* buf, int off, int len)
  */
 address InterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
-  address start = __ pc();  // Remember stub start address (is rtn value).
-
   if (UseCRC32Intrinsics) {
+    address start = __ pc();  // Remember stub start address (is rtn value).
     Label slow_path;
 
     // Safepoint check
@@ -1406,11 +1396,11 @@ address InterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpret
     // Generate a vanilla native entry as the slow path.
     BLOCK_COMMENT("} CRC32_updateBytes(Buffer)");
     BIND(slow_path);
+    __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native), R11_scratch1);
+    return start;
   }
 
-  (void) generate_native_entry(false);
+  return NULL;
-
-  return start;
 }
 
 // These should never be compiled since the interpreter will prefer

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

@@ -468,7 +468,7 @@ address InterpreterGenerator::generate_Reference_get_entry(void) {
 
   // If G1 is not enabled then attempt to go through the accessor entry point
   // Reference.get is an accessor
-  return generate_jump_to_normal_entry();
+  return NULL;
 }
 
 //

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

@@ -59,6 +59,13 @@ const Address InterpreterMacroAssembler::d_tmp(FP, (frame::interpreter_frame_d_s
 
 #endif // CC_INTERP
 
+void InterpreterMacroAssembler::jump_to_entry(address entry) {
+  assert(entry, "Entry must have been generated by now");
+  AddressLiteral al(entry);
+  jump_to(al, G3_scratch);
+  delayed()->nop();
+}
+
 void InterpreterMacroAssembler::compute_extra_locals_size_in_bytes(Register args_size, Register locals_size, Register delta) {
   // Note: this algorithm is also used by C1's OSR entry sequence.
   // Any changes should also be applied to CodeEmitter::emit_osr_entry().

hotspot/src/cpu/sparc/vm/interp_masm_sparc.hpp

@@ -80,6 +80,8 @@ class InterpreterMacroAssembler: public MacroAssembler {
   InterpreterMacroAssembler(CodeBuffer* c)
     : MacroAssembler(c) {}
 
+  void jump_to_entry(address entry);
+
 #ifndef CC_INTERP
   virtual void load_earlyret_value(TosState state);
 

hotspot/src/cpu/sparc/vm/interpreterGenerator_sparc.hpp

@@ -34,9 +34,8 @@
   address generate_abstract_entry(void);
   // there are no math intrinsics on sparc
   address generate_math_entry(AbstractInterpreter::MethodKind kind) { return NULL; }
-  address generate_jump_to_normal_entry(void);
+  address generate_accessor_entry(void) { return NULL; }
-  address generate_accessor_entry(void) { return generate_jump_to_normal_entry(); }
+  address generate_empty_entry(void) { return NULL; }
-  address generate_empty_entry(void) { return generate_jump_to_normal_entry(); }
   address generate_Reference_get_entry(void);
   void lock_method(void);
   void save_native_result(void);

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

@@ -241,15 +241,6 @@ void InterpreterGenerator::generate_counter_overflow(Label& Lcontinue) {
 
 // Various method entries
 
-address InterpreterGenerator::generate_jump_to_normal_entry(void) {
-  address entry = __ pc();
-  assert(Interpreter::entry_for_kind(Interpreter::zerolocals) != NULL, "should already be generated");
-  AddressLiteral al(Interpreter::entry_for_kind(Interpreter::zerolocals));
-  __ jump_to(al, G3_scratch);
-  __ delayed()->nop();
-  return entry;
-}
-
 // Abstract method entry
 // Attempt to execute abstract method. Throw exception
 //

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

@@ -779,14 +779,14 @@ address InterpreterGenerator::generate_Reference_get_entry(void) {
 
     // Generate regular method entry
     __ bind(slow_path);
-    (void) generate_normal_entry(false);
+    __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::zerolocals));
     return entry;
   }
 #endif // INCLUDE_ALL_GCS
 
   // If G1 is not enabled then attempt to go through the accessor entry point
   // Reference.get is an accessor
-  return generate_jump_to_normal_entry();
+  return NULL;
 }
 
 //

hotspot/src/cpu/x86/vm/cppInterpreter_x86.cpp

@@ -807,7 +807,7 @@ address InterpreterGenerator::generate_Reference_get_entry(void) {
 
   // If G1 is not enabled then attempt to go through the accessor entry point
   // Reference.get is an accessor
-  return generate_jump_to_normal_entry();
+  return NULL;
 }
 
 //

hotspot/src/cpu/x86/vm/interp_masm_x86.cpp

@@ -40,6 +40,11 @@
 
 // Implementation of InterpreterMacroAssembler
 
+void InterpreterMacroAssembler::jump_to_entry(address entry) {
+  assert(entry, "Entry must have been generated by now");
+  jump(RuntimeAddress(entry));
+}
+
 #ifndef CC_INTERP
 void InterpreterMacroAssembler::profile_obj_type(Register obj, const Address& mdo_addr) {
   Label update, next, none;

hotspot/src/cpu/x86/vm/interp_masm_x86.hpp

@@ -60,6 +60,8 @@ class InterpreterMacroAssembler: public MacroAssembler {
     _locals_register(LP64_ONLY(r14) NOT_LP64(rdi)),
     _bcp_register(LP64_ONLY(r13) NOT_LP64(rsi)) {}
 
+  void jump_to_entry(address entry);
+
   void load_earlyret_value(TosState state);
 
 #ifdef CC_INTERP

hotspot/src/cpu/x86/vm/interpreterGenerator_x86.cpp

@@ -31,17 +31,6 @@
 
 #define __ _masm->
 
-// Jump into normal path for accessor and empty entry to jump to normal entry
-// The "fast" optimization don't update compilation count therefore can disable inlining
-// for these functions that should be inlined.
-address InterpreterGenerator::generate_jump_to_normal_entry(void) {
-  address entry_point = __ pc();
-
-  assert(Interpreter::entry_for_kind(Interpreter::zerolocals) != NULL, "should already be generated");
-  __ jump(RuntimeAddress(Interpreter::entry_for_kind(Interpreter::zerolocals)));
-  return entry_point;
-}
-
 // Abstract method entry
 // Attempt to execute abstract method. Throw exception
 address InterpreterGenerator::generate_abstract_entry(void) {

hotspot/src/cpu/x86/vm/interpreterGenerator_x86.hpp

@@ -36,9 +36,8 @@
   address generate_native_entry(bool synchronized);
   address generate_abstract_entry(void);
   address generate_math_entry(AbstractInterpreter::MethodKind kind);
-  address generate_jump_to_normal_entry(void);
+  address generate_accessor_entry(void) { return NULL; }
-  address generate_accessor_entry(void) { return generate_jump_to_normal_entry(); }
+  address generate_empty_entry(void) { return NULL; }
-  address generate_empty_entry(void) { return generate_jump_to_normal_entry(); }
   address generate_Reference_get_entry();
   address generate_CRC32_update_entry();
   address generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind);

hotspot/src/cpu/x86/vm/templateInterpreter_x86_32.cpp

@@ -697,15 +697,14 @@ address InterpreterGenerator::generate_Reference_get_entry(void) {
     __ jmp(rdi);
 
     __ bind(slow_path);
-    (void) generate_normal_entry(false);
+    __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::zerolocals));
-
     return entry;
   }
 #endif // INCLUDE_ALL_GCS
 
   // If G1 is not enabled then attempt to go through the accessor entry point
   // Reference.get is an accessor
-  return generate_jump_to_normal_entry();
+  return NULL;
 }
 
 /**
@@ -753,12 +752,10 @@ address InterpreterGenerator::generate_CRC32_update_entry() {
 
     // generate a vanilla native entry as the slow path
     __ bind(slow_path);
-
+    __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native));
-    (void) generate_native_entry(false);
-
     return entry;
   }
-  return generate_native_entry(false);
+  return NULL;
 }
 
 /**
@@ -821,12 +818,10 @@ address InterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpret
 
     // generate a vanilla native entry as the slow path
     __ bind(slow_path);
-
+    __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native));
-    (void) generate_native_entry(false);
-
     return entry;
   }
-  return generate_native_entry(false);
+  return NULL;
 }
 
 /**
@@ -873,7 +868,7 @@ address InterpreterGenerator::generate_CRC32C_updateBytes_entry(AbstractInterpre
 
     return entry;
   }
-  return generate_native_entry(false);
+  return NULL;
 }
 
 /**
@@ -881,10 +876,8 @@ address InterpreterGenerator::generate_CRC32C_updateBytes_entry(AbstractInterpre
  *    java.lang.Float.intBitsToFloat(int bits)
  */
 address InterpreterGenerator::generate_Float_intBitsToFloat_entry() {
-  address entry;
-
   if (UseSSE >= 1) {
-    entry = __ pc();
+    address entry = __ pc();
 
     // rsi: the sender's SP
 
@@ -898,11 +891,10 @@ address InterpreterGenerator::generate_Float_intBitsToFloat_entry() {
     __ pop(rdi); // get return address
     __ mov(rsp, rsi); // set rsp to the sender's SP
     __ jmp(rdi);
-  } else {
+    return entry;
-    entry = generate_native_entry(false);
   }
 
-  return entry;
+  return NULL;
 }
 
 /**
@@ -910,10 +902,8 @@ address InterpreterGenerator::generate_Float_intBitsToFloat_entry() {
  *    java.lang.Float.floatToRawIntBits(float value)
  */
 address InterpreterGenerator::generate_Float_floatToRawIntBits_entry() {
-  address entry;
-
   if (UseSSE >= 1) {
-    entry = __ pc();
+    address entry = __ pc();
 
     // rsi: the sender's SP
 
@@ -927,11 +917,10 @@ address InterpreterGenerator::generate_Float_floatToRawIntBits_entry() {
     __ pop(rdi); // get return address
     __ mov(rsp, rsi); // set rsp to the sender's SP
     __ jmp(rdi);
-  } else {
+    return entry;
-    entry = generate_native_entry(false);
   }
 
-  return entry;
+  return NULL;
 }
 
 
@@ -940,10 +929,8 @@ address InterpreterGenerator::generate_Float_floatToRawIntBits_entry() {
  *    java.lang.Double.longBitsToDouble(long bits)
  */
 address InterpreterGenerator::generate_Double_longBitsToDouble_entry() {
-  address entry;
-
    if (UseSSE >= 2) {
-     entry = __ pc();
+     address entry = __ pc();
 
      // rsi: the sender's SP
 
@@ -957,11 +944,10 @@ address InterpreterGenerator::generate_Double_longBitsToDouble_entry() {
      __ pop(rdi); // get return address
      __ mov(rsp, rsi); // set rsp to the sender's SP
      __ jmp(rdi);
-   } else {
+     return entry;
-     entry = generate_native_entry(false);
    }
 
-   return entry;
+   return NULL;
 }
 
 /**
@@ -969,10 +955,8 @@ address InterpreterGenerator::generate_Double_longBitsToDouble_entry() {
  *    java.lang.Double.doubleToRawLongBits(double value)
  */
 address InterpreterGenerator::generate_Double_doubleToRawLongBits_entry() {
-  address entry;
-
   if (UseSSE >= 2) {
-    entry = __ pc();
+    address entry = __ pc();
 
     // rsi: the sender's SP
 
@@ -987,11 +971,10 @@ address InterpreterGenerator::generate_Double_doubleToRawLongBits_entry() {
     __ pop(rdi); // get return address
     __ mov(rsp, rsi); // set rsp to the sender's SP
     __ jmp(rdi);
-  } else {
+    return entry;
-    entry = generate_native_entry(false);
   }
 
-  return entry;
+  return NULL;
 }
 
 //

hotspot/src/cpu/x86/vm/templateInterpreter_x86_64.cpp

@@ -677,15 +677,14 @@ address InterpreterGenerator::generate_Reference_get_entry(void) {
 
     // generate a vanilla interpreter entry as the slow path
     __ bind(slow_path);
-    (void) generate_normal_entry(false);
+    __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::zerolocals));
-
     return entry;
   }
 #endif // INCLUDE_ALL_GCS
 
   // If G1 is not enabled then attempt to go through the accessor entry point
   // Reference.get is an accessor
-  return generate_jump_to_normal_entry();
+  return NULL;
 }
 
 /**
@@ -733,12 +732,10 @@ address InterpreterGenerator::generate_CRC32_update_entry() {
 
     // generate a vanilla native entry as the slow path
     __ bind(slow_path);
-
+    __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native));
-    (void) generate_native_entry(false);
-
     return entry;
   }
-  return generate_native_entry(false);
+  return NULL;
 }
 
 /**
@@ -796,12 +793,10 @@ address InterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpret
 
     // generate a vanilla native entry as the slow path
     __ bind(slow_path);
-
+    __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native));
-    (void) generate_native_entry(false);
-
     return entry;
   }
-  return generate_native_entry(false);
+  return NULL;
 }
 
 /**
@@ -852,7 +847,7 @@ address InterpreterGenerator::generate_CRC32C_updateBytes_entry(AbstractInterpre
     return entry;
   }
 
-  return generate_native_entry(false);
+  return NULL;
 }
 
 // Interpreter stub for calling a native method. (asm interpreter)

hotspot/src/cpu/zero/vm/cppInterpreter_zero.cpp

@@ -816,7 +816,7 @@ address InterpreterGenerator::generate_Reference_get_entry(void) {
 
   // If G1 is not enabled then attempt to go through the normal entry point
   // Reference.get could be instrumented by jvmti
-  return generate_normal_entry(false);
+  return NULL;
 }
 
 address InterpreterGenerator::generate_native_entry(bool synchronized) {

hotspot/src/share/vm/interpreter/interpreter.cpp

@@ -104,7 +104,10 @@ CodeletMark::~CodeletMark() {
   (*_masm)->flush();
 
   // Commit Codelet.
-  AbstractInterpreter::code()->commit((*_masm)->code()->pure_insts_size(), (*_masm)->code()->strings());
+  int committed_code_size = (*_masm)->code()->pure_insts_size();
+  if (committed_code_size) {
+    AbstractInterpreter::code()->commit(committed_code_size, (*_masm)->code()->strings());
+  }
   // Make sure nobody can use _masm outside a CodeletMark lifespan.
   *_masm = NULL;
 }
@@ -546,14 +549,15 @@ void AbstractInterpreterGenerator::initialize_method_handle_entries() {
 address InterpreterGenerator::generate_method_entry(
                                         AbstractInterpreter::MethodKind kind) {
   // determine code generation flags
+  bool native = false;
   bool synchronized = false;
   address entry_point = NULL;
 
   switch (kind) {
   case Interpreter::zerolocals             :                                          break;
   case Interpreter::zerolocals_synchronized:                synchronized = true;      break;
-  case Interpreter::native                 : entry_point = generate_native_entry(false); break;
+  case Interpreter::native                 : native = true;                           break;
-  case Interpreter::native_synchronized    : entry_point = generate_native_entry(true);  break;
+  case Interpreter::native_synchronized    : native = true; synchronized = true;      break;
   case Interpreter::empty                  : entry_point = generate_empty_entry();    break;
   case Interpreter::accessor               : entry_point = generate_accessor_entry(); break;
   case Interpreter::abstract               : entry_point = generate_abstract_entry(); break;
@@ -571,11 +575,11 @@ address InterpreterGenerator::generate_method_entry(
                                            : entry_point = generate_Reference_get_entry(); break;
 #ifndef CC_INTERP
   case Interpreter::java_util_zip_CRC32_update
-                                           : entry_point = generate_CRC32_update_entry();  break;
+                                           : native = true; entry_point = generate_CRC32_update_entry();  break;
   case Interpreter::java_util_zip_CRC32_updateBytes
                                            : // fall thru
   case Interpreter::java_util_zip_CRC32_updateByteBuffer
-                                           : entry_point = generate_CRC32_updateBytes_entry(kind); break;
+                                           : native = true; entry_point = generate_CRC32_updateBytes_entry(kind); break;
   case Interpreter::java_util_zip_CRC32C_updateBytes
                                            : // fall thru
   case Interpreter::java_util_zip_CRC32C_updateDirectByteBuffer
@@ -584,19 +588,19 @@ address InterpreterGenerator::generate_method_entry(
   // On x86_32 platforms, a special entry is generated for the following four methods.
   // On other platforms the normal entry is used to enter these methods.
   case Interpreter::java_lang_Float_intBitsToFloat
-                                           : entry_point = generate_Float_intBitsToFloat_entry(); break;
+                                           : native = true; entry_point = generate_Float_intBitsToFloat_entry(); break;
   case Interpreter::java_lang_Float_floatToRawIntBits
-                                           : entry_point = generate_Float_floatToRawIntBits_entry(); break;
+                                           : native = true; entry_point = generate_Float_floatToRawIntBits_entry(); break;
   case Interpreter::java_lang_Double_longBitsToDouble
-                                           : entry_point = generate_Double_longBitsToDouble_entry(); break;
+                                           : native = true; entry_point = generate_Double_longBitsToDouble_entry(); break;
   case Interpreter::java_lang_Double_doubleToRawLongBits
-                                           : entry_point = generate_Double_doubleToRawLongBits_entry(); break;
+                                           : native = true; entry_point = generate_Double_doubleToRawLongBits_entry(); break;
 #else
   case Interpreter::java_lang_Float_intBitsToFloat:
   case Interpreter::java_lang_Float_floatToRawIntBits:
   case Interpreter::java_lang_Double_longBitsToDouble:
   case Interpreter::java_lang_Double_doubleToRawLongBits:
-        entry_point = generate_native_entry(false);
+    native = true;
     break;
 #endif // defined(TARGET_ARCH_x86) && !defined(_LP64)
 #endif // CC_INTERP
@@ -609,5 +613,18 @@ address InterpreterGenerator::generate_method_entry(
     return entry_point;
   }
 
-  return generate_normal_entry(synchronized);
+  // We expect the normal and native entry points to be generated first so we can reuse them.
+  if (native) {
+    entry_point = Interpreter::entry_for_kind(synchronized ? Interpreter::native_synchronized : Interpreter::native);
+    if (entry_point == NULL) {
+      entry_point = generate_native_entry(synchronized);
+    }
+  } else {
+    entry_point = Interpreter::entry_for_kind(synchronized ? Interpreter::zerolocals_synchronized : Interpreter::zerolocals);
+    if (entry_point == NULL) {
+      entry_point = generate_normal_entry(synchronized);
+    }
+  }
+
+  return entry_point;
 }

hotspot/src/share/vm/interpreter/templateInterpreter.cpp

@@ -412,6 +412,14 @@ void TemplateInterpreterGenerator::generate_all() {
       method_entry(java_lang_math_pow  )
       method_entry(java_lang_ref_reference_get)
 
+      initialize_method_handle_entries();
+
+      // all native method kinds (must be one contiguous block)
+      Interpreter::_native_entry_begin = Interpreter::code()->code_end();
+      method_entry(native)
+      method_entry(native_synchronized)
+      Interpreter::_native_entry_end = Interpreter::code()->code_end();
+
       if (UseCRC32Intrinsics) {
         method_entry(java_util_zip_CRC32_update)
         method_entry(java_util_zip_CRC32_updateBytes)
@@ -428,14 +436,6 @@ void TemplateInterpreterGenerator::generate_all() {
       method_entry(java_lang_Double_longBitsToDouble);
       method_entry(java_lang_Double_doubleToRawLongBits);
 
-      initialize_method_handle_entries();
-
-      // all native method kinds (must be one contiguous block)
-      Interpreter::_native_entry_begin = Interpreter::code()->code_end();
-      method_entry(native)
-      method_entry(native_synchronized)
-      Interpreter::_native_entry_end = Interpreter::code()->code_end();
-
 #undef method_entry
 
       // Bytecodes