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src/hotspot/share/runtime/sharedRuntime.hpp

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  8  *
  9  * This code is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #ifndef SHARE_RUNTIME_SHAREDRUNTIME_HPP
 26 #define SHARE_RUNTIME_SHAREDRUNTIME_HPP
 27 

 28 #include "code/codeBlob.hpp"
 29 #include "code/vmreg.hpp"
 30 #include "interpreter/linkResolver.hpp"
 31 #include "memory/allStatic.hpp"
 32 #include "memory/resourceArea.hpp"

 33 #include "runtime/stubDeclarations.hpp"
 34 #include "utilities/macros.hpp"
 35 
 36 class AdapterHandlerEntry;
 37 class AdapterFingerPrint;
 38 class vframeStream;

 39 
 40 // Runtime is the base class for various runtime interfaces
 41 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
 42 // shared functionality such as exception forwarding (C++ to
 43 // Java exceptions), locking/unlocking mechanisms, statistical
 44 // information, etc.
 45 
 46 // define SharedStubId enum tags: wrong_method_id, etc
 47 
 48 #define SHARED_STUB_ID_ENUM_DECLARE(name, type) STUB_ID_NAME(name),
 49 enum class SharedStubId :int {
 50   NO_STUBID = -1,
 51   SHARED_STUBS_DO(SHARED_STUB_ID_ENUM_DECLARE)
 52   NUM_STUBIDS
 53 };
 54 #undef SHARED_STUB_ID_ENUM_DECLARE
 55 
 56 class SharedRuntime: AllStatic {
 57  private:
 58   // Declare shared stub fields

347   // on top of the stack.
348   // The caller (or one of its callers) must use a ResourceMark
349   // in order to correctly free the result.
350   //
351   static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
352 
353   // Fill in the "X cannot be cast to a Y" message for ClassCastException
354   //
355   // @param caster_klass the class of the object we are casting
356   // @param target_klass the target klass attempt
357   // @return the dynamically allocated exception message (must be freed
358   // by the caller using a resource mark)
359   //
360   // This version does not require access the frame, so it can be called
361   // from interpreted code
362   // The caller (or one of it's callers) must use a ResourceMark
363   // in order to correctly free the result.
364   //
365   static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = nullptr);
366 


367   // Resolves a call site- may patch in the destination of the call into the
368   // compiled code.
369   static methodHandle resolve_helper(bool is_virtual, bool is_optimized, TRAPS);
370 
371  private:
372   // deopt blob
373   static void generate_deopt_blob(void);
374 
375   static bool handle_ic_miss_helper_internal(Handle receiver, nmethod* caller_nm, const frame& caller_frame,
376                                              methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info,
377                                              bool& needs_ic_stub_refill, TRAPS);
378 
379  public:
380   static DeoptimizationBlob* deopt_blob(void)      { return _deopt_blob; }
381 
382   // Resets a call-site in compiled code so it will get resolved again.
383   static methodHandle reresolve_call_site(TRAPS);
384 
385   // In the code prolog, if the klass comparison fails, the inline cache
386   // misses and the call site is patched to megamorphic
387   static methodHandle handle_ic_miss_helper(TRAPS);
388 
389   // Find the method that called us.
390   static methodHandle find_callee_method(TRAPS);
391 
392   static void monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* thread);
393 
394   static void monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current);
395 
396   // Issue UL warning for unlocked JNI monitor on virtual thread termination
397   static void log_jni_monitor_still_held();
398 
399  private:
400   static Handle find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
401   static Handle find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
402 
403   static Method* extract_attached_method(vframeStream& vfst);
404 
405 #if defined(X86) && defined(COMPILER1)
406   // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
407   static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
408 #endif // X86 && COMPILER1
409 
410  public:
411 
412   // Read the array of BasicTypes from a Java signature, and compute where
413   // compiled Java code would like to put the results.  Values in reg_lo and
414   // reg_hi refer to 4-byte quantities.  Values less than SharedInfo::stack0 are
415   // registers, those above refer to 4-byte stack slots.  All stack slots are
416   // based off of the window top.  SharedInfo::stack0 refers to the first usable
417   // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
418   // 4-bytes higher.
419   // return value is the maximum number of VMReg stack slots the convention will use.
420   static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);








421 
422   static void check_member_name_argument_is_last_argument(const methodHandle& method,
423                                                           const BasicType* sig_bt,
424                                                           const VMRegPair* regs) NOT_DEBUG_RETURN;
425 
426   // Ditto except for calling C
427   //
428   // C argument in register AND stack slot.
429   // Some architectures require that an argument must be passed in a register
430   // AND in a stack slot. These architectures provide a second VMRegPair array
431   // to be filled by the c_calling_convention method. On other architectures,
432   // null is being passed as the second VMRegPair array, so arguments are either
433   // passed in a register OR in a stack slot.
434   static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
435 
436   static int vector_calling_convention(VMRegPair *regs,
437                                        uint num_bits,
438                                        uint total_args_passed);
439 
440   // Generate I2C and C2I adapters. These adapters are simple argument marshalling

447   // by the time we reach the blob there is compiled code available. This allows
448   // the blob to pass the incoming stack pointer (the sender sp) in a known
449   // location for the interpreter to record. This is used by the frame code
450   // to correct the sender code to match up with the stack pointer when the
451   // thread left the compiled code. In addition it allows the interpreter
452   // to remove the space the c2i adapter allocated to do its argument conversion.
453 
454   // Although a c2i blob will always run interpreted even if compiled code is
455   // present if we see that compiled code is present the compiled call site
456   // will be patched/re-resolved so that later calls will run compiled.
457 
458   // Additionally a c2i blob need to have a unverified entry because it can be reached
459   // in situations where the call site is an inlined cache site and may go megamorphic.
460 
461   // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
462   // that the interpreter before it does any call dispatch will record the current
463   // stack pointer in the interpreter frame. On return it will restore the stack
464   // pointer as needed. This means the i2c adapter code doesn't need any special
465   // handshaking path with compiled code to keep the stack walking correct.
466 
467   static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
468                                                       int total_args_passed,
469                                                       int max_arg,
470                                                       const BasicType *sig_bt,
471                                                       const VMRegPair *regs,
472                                                       AdapterFingerPrint* fingerprint);





473 
474   static void gen_i2c_adapter(MacroAssembler *_masm,
475                               int total_args_passed,
476                               int comp_args_on_stack,
477                               const BasicType *sig_bt,
478                               const VMRegPair *regs);
479 
480   // OSR support
481 
482   // OSR_migration_begin will extract the jvm state from an interpreter
483   // frame (locals, monitors) and store the data in a piece of C heap
484   // storage. This then allows the interpreter frame to be removed from the
485   // stack and the OSR nmethod to be called. That method is called with a
486   // pointer to the C heap storage. This pointer is the return value from
487   // OSR_migration_begin.
488 
489   static intptr_t* OSR_migration_begin(JavaThread *thread);
490 
491   // OSR_migration_end is a trivial routine. It is called after the compiled
492   // method has extracted the jvm state from the C heap that OSR_migration_begin
493   // created. It's entire job is to simply free this storage.
494   static void OSR_migration_end(intptr_t* buf);
495 
496   // Convert a sig into a calling convention register layout
497   // and find interesting things about it.

530   //
531   // The wrapper may contain special-case code if the given method
532   // is a compiled method handle adapter, such as _invokeBasic, _linkToVirtual, etc.
533   static nmethod* generate_native_wrapper(MacroAssembler* masm,
534                                           const methodHandle& method,
535                                           int compile_id,
536                                           BasicType* sig_bt,
537                                           VMRegPair* regs,
538                                           BasicType ret_type);
539 
540   // A compiled caller has just called the interpreter, but compiled code
541   // exists.  Patch the caller so he no longer calls into the interpreter.
542   static void fixup_callers_callsite(Method* moop, address ret_pc);
543   static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
544 
545   // Slow-path Locking and Unlocking
546   static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
547   static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
548 
549   // Resolving of calls
550   static address get_resolved_entry        (JavaThread* current, methodHandle callee_method);

551   static address resolve_static_call_C     (JavaThread* current);
552   static address resolve_virtual_call_C    (JavaThread* current);
553   static address resolve_opt_virtual_call_C(JavaThread* current);
554 



555   // arraycopy, the non-leaf version.  (See StubRoutines for all the leaf calls.)
556   static void slow_arraycopy_C(oopDesc* src,  jint src_pos,
557                                oopDesc* dest, jint dest_pos,
558                                jint length, JavaThread* thread);
559 
560   // handle ic miss with caller being compiled code
561   // wrong method handling (inline cache misses)
562   static address handle_wrong_method(JavaThread* current);
563   static address handle_wrong_method_abstract(JavaThread* current);
564   static address handle_wrong_method_ic_miss(JavaThread* current);


565 
566   static address handle_unsafe_access(JavaThread* thread, address next_pc);
567 

568 #ifndef PRODUCT
569 
570   // Collect and print inline cache miss statistics
571  private:
572   enum { maxICmiss_count = 100 };
573   static int     _ICmiss_index;                  // length of IC miss histogram
574   static int     _ICmiss_count[maxICmiss_count]; // miss counts
575   static address _ICmiss_at[maxICmiss_count];    // miss addresses
576   static void trace_ic_miss(address at);
577 
578  public:
579   static uint _ic_miss_ctr;                      // total # of IC misses
580   static uint _wrong_method_ctr;
581   static uint _resolve_static_ctr;
582   static uint _resolve_virtual_ctr;
583   static uint _resolve_opt_virtual_ctr;
584   static uint _implicit_null_throws;
585   static uint _implicit_div0_throws;
586 
587   static uint _jbyte_array_copy_ctr;       // Slow-path byte array copy

656 // Rmethod->_i2i_entry.  On entry, the interpreted frame has not yet been
657 // setup.  Compiled frames are fixed-size and the args are likely not in the
658 // right place.  Hence all the args will likely be copied into the
659 // interpreter's frame, forcing that frame to grow.  The compiled frame's
660 // outgoing stack args will be dead after the copy.
661 //
662 // Native wrappers, like adapters, marshal arguments.  Unlike adapters they
663 // also perform an official frame push & pop.  They have a call to the native
664 // routine in their middles and end in a return (instead of ending in a jump).
665 // The native wrappers are stored in real nmethods instead of the BufferBlobs
666 // used by the adapters.  The code generation happens here because it's very
667 // similar to what the adapters have to do.
668 
669 class AdapterHandlerEntry : public CHeapObj<mtCode> {
670   friend class AdapterHandlerLibrary;
671 
672  private:
673   AdapterFingerPrint* _fingerprint;
674   address _i2c_entry;
675   address _c2i_entry;


676   address _c2i_unverified_entry;

677   address _c2i_no_clinit_check_entry;
678 



679 #ifdef ASSERT
680   // Captures code and signature used to generate this adapter when
681   // verifying adapter equivalence.
682   unsigned char* _saved_code;
683   int            _saved_code_length;
684 #endif
685 
686   AdapterHandlerEntry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry,
687                       address c2i_unverified_entry,

688                       address c2i_no_clinit_check_entry) :
689     _fingerprint(fingerprint),
690     _i2c_entry(i2c_entry),
691     _c2i_entry(c2i_entry),


692     _c2i_unverified_entry(c2i_unverified_entry),
693     _c2i_no_clinit_check_entry(c2i_no_clinit_check_entry)


694 #ifdef ASSERT
695     , _saved_code_length(0)
696 #endif
697   { }
698 
699   ~AdapterHandlerEntry();
700 
701  public:
702   address get_i2c_entry()                  const { return _i2c_entry; }
703   address get_c2i_entry()                  const { return _c2i_entry; }
704   address get_c2i_unverified_entry()       const { return _c2i_unverified_entry; }
705   address get_c2i_no_clinit_check_entry()  const { return _c2i_no_clinit_check_entry; }



706 
707   address base_address();
708   void relocate(address new_base);
709 




710   AdapterFingerPrint* fingerprint() const { return _fingerprint; }
711 
712 #ifdef ASSERT
713   // Used to verify that code generated for shared adapters is equivalent
714   void save_code   (unsigned char* code, int length);
715   bool compare_code(AdapterHandlerEntry* other);
716 #endif
717 
718   //virtual void print_on(outputStream* st) const;  DO NOT USE
719   void print_adapter_on(outputStream* st) const;
720 };
721 


722 class AdapterHandlerLibrary: public AllStatic {
723   friend class SharedRuntime;
724  private:
725   static BufferBlob* _buffer; // the temporary code buffer in CodeCache
726   static AdapterHandlerEntry* _abstract_method_handler;
727   static AdapterHandlerEntry* _no_arg_handler;
728   static AdapterHandlerEntry* _int_arg_handler;
729   static AdapterHandlerEntry* _obj_arg_handler;
730   static AdapterHandlerEntry* _obj_int_arg_handler;
731   static AdapterHandlerEntry* _obj_obj_arg_handler;
732 
733   static BufferBlob* buffer_blob();
734   static void initialize();
735   static AdapterHandlerEntry* create_adapter(AdapterBlob*& new_adapter,
736                                              int total_args_passed,
737                                              BasicType* sig_bt,
738                                              bool allocate_code_blob);
739   static AdapterHandlerEntry* get_simple_adapter(const methodHandle& method);
740  public:
741 
742   static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
743                                         address i2c_entry,
744                                         address c2i_entry,
745                                         address c2i_unverified_entry,
746                                         address c2i_no_clinit_check_entry = nullptr);
747   static void create_native_wrapper(const methodHandle& method);
748   static AdapterHandlerEntry* get_adapter(const methodHandle& method);
749 
750   static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
751   static void print_handler_on(outputStream* st, const CodeBlob* b);
752   static bool contains(const CodeBlob* b);
753 #ifndef PRODUCT
754   static void print_statistics();
755 #endif // PRODUCT
756 
757 };
758 



























































759 #endif // SHARE_RUNTIME_SHAREDRUNTIME_HPP

  8  *
  9  * This code is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #ifndef SHARE_RUNTIME_SHAREDRUNTIME_HPP
 26 #define SHARE_RUNTIME_SHAREDRUNTIME_HPP
 27 
 28 #include "asm/codeBuffer.hpp"
 29 #include "code/codeBlob.hpp"
 30 #include "code/vmreg.hpp"
 31 #include "interpreter/linkResolver.hpp"
 32 #include "memory/allStatic.hpp"
 33 #include "memory/resourceArea.hpp"
 34 #include "runtime/signature.hpp"
 35 #include "runtime/stubDeclarations.hpp"
 36 #include "utilities/macros.hpp"
 37 
 38 class AdapterHandlerEntry;
 39 class AdapterFingerPrint;
 40 class vframeStream;
 41 class SigEntry;
 42 
 43 // Runtime is the base class for various runtime interfaces
 44 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
 45 // shared functionality such as exception forwarding (C++ to
 46 // Java exceptions), locking/unlocking mechanisms, statistical
 47 // information, etc.
 48 
 49 // define SharedStubId enum tags: wrong_method_id, etc
 50 
 51 #define SHARED_STUB_ID_ENUM_DECLARE(name, type) STUB_ID_NAME(name),
 52 enum class SharedStubId :int {
 53   NO_STUBID = -1,
 54   SHARED_STUBS_DO(SHARED_STUB_ID_ENUM_DECLARE)
 55   NUM_STUBIDS
 56 };
 57 #undef SHARED_STUB_ID_ENUM_DECLARE
 58 
 59 class SharedRuntime: AllStatic {
 60  private:
 61   // Declare shared stub fields

350   // on top of the stack.
351   // The caller (or one of its callers) must use a ResourceMark
352   // in order to correctly free the result.
353   //
354   static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
355 
356   // Fill in the "X cannot be cast to a Y" message for ClassCastException
357   //
358   // @param caster_klass the class of the object we are casting
359   // @param target_klass the target klass attempt
360   // @return the dynamically allocated exception message (must be freed
361   // by the caller using a resource mark)
362   //
363   // This version does not require access the frame, so it can be called
364   // from interpreted code
365   // The caller (or one of it's callers) must use a ResourceMark
366   // in order to correctly free the result.
367   //
368   static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = nullptr);
369 
370   static char* generate_identity_exception_message(JavaThread* thr, Klass* klass);
371 
372   // Resolves a call site- may patch in the destination of the call into the
373   // compiled code.
374   static methodHandle resolve_helper(bool is_virtual, bool is_optimized, bool& caller_is_c1, TRAPS);
375 
376  private:
377   // deopt blob
378   static void generate_deopt_blob(void);
379 
380   static bool handle_ic_miss_helper_internal(Handle receiver, nmethod* caller_nm, const frame& caller_frame,
381                                              methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info,
382                                              bool& needs_ic_stub_refill, bool& is_optimized, bool caller_is_c1, TRAPS);
383 
384  public:
385   static DeoptimizationBlob* deopt_blob(void)      { return _deopt_blob; }
386 
387   // Resets a call-site in compiled code so it will get resolved again.
388   static methodHandle reresolve_call_site(bool& is_static_call, bool& is_optimized, bool& caller_is_c1, TRAPS);
389 
390   // In the code prolog, if the klass comparison fails, the inline cache
391   // misses and the call site is patched to megamorphic
392   static methodHandle handle_ic_miss_helper(bool& is_optimized, bool& caller_is_c1, TRAPS);
393 
394   // Find the method that called us.
395   static methodHandle find_callee_method(bool is_optimized, bool& caller_is_c1, TRAPS);
396 
397   static void monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* thread);
398 
399   static void monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current);
400 
401   // Issue UL warning for unlocked JNI monitor on virtual thread termination
402   static void log_jni_monitor_still_held();
403 
404  private:
405   static Handle find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
406   static Handle find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
407 
408   static Method* extract_attached_method(vframeStream& vfst);
409 
410 #if defined(X86) && defined(COMPILER1)
411   // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
412   static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
413 #endif // X86 && COMPILER1
414 
415  public:
416 
417   // Read the array of BasicTypes from a Java signature, and compute where
418   // compiled Java code would like to put the results.  Values in reg_lo and
419   // reg_hi refer to 4-byte quantities.  Values less than SharedInfo::stack0 are
420   // registers, those above refer to 4-byte stack slots.  All stack slots are
421   // based off of the window top.  SharedInfo::stack0 refers to the first usable
422   // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
423   // 4-bytes higher.
424   // return value is the maximum number of VMReg stack slots the convention will use.
425   static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
426   static int java_calling_convention(const GrowableArray<SigEntry>* sig, VMRegPair* regs) {
427     BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sig->length());
428     int total_args_passed = SigEntry::fill_sig_bt(sig, sig_bt);
429     return java_calling_convention(sig_bt, regs, total_args_passed);
430   }
431   static int java_return_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
432   static const uint java_return_convention_max_int;
433   static const uint java_return_convention_max_float;
434 
435   static void check_member_name_argument_is_last_argument(const methodHandle& method,
436                                                           const BasicType* sig_bt,
437                                                           const VMRegPair* regs) NOT_DEBUG_RETURN;
438 
439   // Ditto except for calling C
440   //
441   // C argument in register AND stack slot.
442   // Some architectures require that an argument must be passed in a register
443   // AND in a stack slot. These architectures provide a second VMRegPair array
444   // to be filled by the c_calling_convention method. On other architectures,
445   // null is being passed as the second VMRegPair array, so arguments are either
446   // passed in a register OR in a stack slot.
447   static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
448 
449   static int vector_calling_convention(VMRegPair *regs,
450                                        uint num_bits,
451                                        uint total_args_passed);
452 
453   // Generate I2C and C2I adapters. These adapters are simple argument marshalling

460   // by the time we reach the blob there is compiled code available. This allows
461   // the blob to pass the incoming stack pointer (the sender sp) in a known
462   // location for the interpreter to record. This is used by the frame code
463   // to correct the sender code to match up with the stack pointer when the
464   // thread left the compiled code. In addition it allows the interpreter
465   // to remove the space the c2i adapter allocated to do its argument conversion.
466 
467   // Although a c2i blob will always run interpreted even if compiled code is
468   // present if we see that compiled code is present the compiled call site
469   // will be patched/re-resolved so that later calls will run compiled.
470 
471   // Additionally a c2i blob need to have a unverified entry because it can be reached
472   // in situations where the call site is an inlined cache site and may go megamorphic.
473 
474   // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
475   // that the interpreter before it does any call dispatch will record the current
476   // stack pointer in the interpreter frame. On return it will restore the stack
477   // pointer as needed. This means the i2c adapter code doesn't need any special
478   // handshaking path with compiled code to keep the stack walking correct.
479 
480   static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *masm,
481                                                       int comp_args_on_stack,
482                                                       const GrowableArray<SigEntry>* sig,
483                                                       const VMRegPair* regs,
484                                                       const GrowableArray<SigEntry>* sig_cc,
485                                                       const VMRegPair* regs_cc,
486                                                       const GrowableArray<SigEntry>* sig_cc_ro,
487                                                       const VMRegPair* regs_cc_ro,
488                                                       AdapterFingerPrint* fingerprint,
489                                                       AdapterBlob*& new_adapter,
490                                                       bool allocate_code_blob);
491 
492   static void gen_i2c_adapter(MacroAssembler *_masm,

493                               int comp_args_on_stack,
494                               const GrowableArray<SigEntry>* sig,
495                               const VMRegPair *regs);
496 
497   // OSR support
498 
499   // OSR_migration_begin will extract the jvm state from an interpreter
500   // frame (locals, monitors) and store the data in a piece of C heap
501   // storage. This then allows the interpreter frame to be removed from the
502   // stack and the OSR nmethod to be called. That method is called with a
503   // pointer to the C heap storage. This pointer is the return value from
504   // OSR_migration_begin.
505 
506   static intptr_t* OSR_migration_begin(JavaThread *thread);
507 
508   // OSR_migration_end is a trivial routine. It is called after the compiled
509   // method has extracted the jvm state from the C heap that OSR_migration_begin
510   // created. It's entire job is to simply free this storage.
511   static void OSR_migration_end(intptr_t* buf);
512 
513   // Convert a sig into a calling convention register layout
514   // and find interesting things about it.

547   //
548   // The wrapper may contain special-case code if the given method
549   // is a compiled method handle adapter, such as _invokeBasic, _linkToVirtual, etc.
550   static nmethod* generate_native_wrapper(MacroAssembler* masm,
551                                           const methodHandle& method,
552                                           int compile_id,
553                                           BasicType* sig_bt,
554                                           VMRegPair* regs,
555                                           BasicType ret_type);
556 
557   // A compiled caller has just called the interpreter, but compiled code
558   // exists.  Patch the caller so he no longer calls into the interpreter.
559   static void fixup_callers_callsite(Method* moop, address ret_pc);
560   static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
561 
562   // Slow-path Locking and Unlocking
563   static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
564   static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
565 
566   // Resolving of calls
567   static address get_resolved_entry        (JavaThread* current, methodHandle callee_method,
568                                             bool is_static_call, bool is_optimized, bool caller_is_c1);
569   static address resolve_static_call_C     (JavaThread* current);
570   static address resolve_virtual_call_C    (JavaThread* current);
571   static address resolve_opt_virtual_call_C(JavaThread* current);
572 
573   static void load_inline_type_fields_in_regs(JavaThread* current, oopDesc* res);
574   static void store_inline_type_fields_to_buf(JavaThread* current, intptr_t res);
575 
576   // arraycopy, the non-leaf version.  (See StubRoutines for all the leaf calls.)
577   static void slow_arraycopy_C(oopDesc* src,  jint src_pos,
578                                oopDesc* dest, jint dest_pos,
579                                jint length, JavaThread* thread);
580 
581   // handle ic miss with caller being compiled code
582   // wrong method handling (inline cache misses)
583   static address handle_wrong_method(JavaThread* current);
584   static address handle_wrong_method_abstract(JavaThread* current);
585   static address handle_wrong_method_ic_miss(JavaThread* current);
586   static void allocate_inline_types(JavaThread* current, Method* callee, bool allocate_receiver);
587   static oop allocate_inline_types_impl(JavaThread* current, methodHandle callee, bool allocate_receiver, TRAPS);
588 
589   static address handle_unsafe_access(JavaThread* thread, address next_pc);
590 
591   static BufferedInlineTypeBlob* generate_buffered_inline_type_adapter(const InlineKlass* vk);
592 #ifndef PRODUCT
593 
594   // Collect and print inline cache miss statistics
595  private:
596   enum { maxICmiss_count = 100 };
597   static int     _ICmiss_index;                  // length of IC miss histogram
598   static int     _ICmiss_count[maxICmiss_count]; // miss counts
599   static address _ICmiss_at[maxICmiss_count];    // miss addresses
600   static void trace_ic_miss(address at);
601 
602  public:
603   static uint _ic_miss_ctr;                      // total # of IC misses
604   static uint _wrong_method_ctr;
605   static uint _resolve_static_ctr;
606   static uint _resolve_virtual_ctr;
607   static uint _resolve_opt_virtual_ctr;
608   static uint _implicit_null_throws;
609   static uint _implicit_div0_throws;
610 
611   static uint _jbyte_array_copy_ctr;       // Slow-path byte array copy

680 // Rmethod->_i2i_entry.  On entry, the interpreted frame has not yet been
681 // setup.  Compiled frames are fixed-size and the args are likely not in the
682 // right place.  Hence all the args will likely be copied into the
683 // interpreter's frame, forcing that frame to grow.  The compiled frame's
684 // outgoing stack args will be dead after the copy.
685 //
686 // Native wrappers, like adapters, marshal arguments.  Unlike adapters they
687 // also perform an official frame push & pop.  They have a call to the native
688 // routine in their middles and end in a return (instead of ending in a jump).
689 // The native wrappers are stored in real nmethods instead of the BufferBlobs
690 // used by the adapters.  The code generation happens here because it's very
691 // similar to what the adapters have to do.
692 
693 class AdapterHandlerEntry : public CHeapObj<mtCode> {
694   friend class AdapterHandlerLibrary;
695 
696  private:
697   AdapterFingerPrint* _fingerprint;
698   address _i2c_entry;
699   address _c2i_entry;
700   address _c2i_inline_entry;
701   address _c2i_inline_ro_entry;
702   address _c2i_unverified_entry;
703   address _c2i_unverified_inline_entry;
704   address _c2i_no_clinit_check_entry;
705 
706   // Support for scalarized inline type calling convention
707   const GrowableArray<SigEntry>* _sig_cc;
708 
709 #ifdef ASSERT
710   // Captures code and signature used to generate this adapter when
711   // verifying adapter equivalence.
712   unsigned char* _saved_code;
713   int            _saved_code_length;
714 #endif
715 
716   AdapterHandlerEntry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry,
717                       address c2i_inline_entry, address c2i_inline_ro_entry,
718                       address c2i_unverified_entry, address c2i_unverified_inline_entry,
719                       address c2i_no_clinit_check_entry) :
720     _fingerprint(fingerprint),
721     _i2c_entry(i2c_entry),
722     _c2i_entry(c2i_entry),
723     _c2i_inline_entry(c2i_inline_entry),
724     _c2i_inline_ro_entry(c2i_inline_ro_entry),
725     _c2i_unverified_entry(c2i_unverified_entry),
726     _c2i_unverified_inline_entry(c2i_unverified_inline_entry),
727     _c2i_no_clinit_check_entry(c2i_no_clinit_check_entry),
728     _sig_cc(nullptr)
729 #ifdef ASSERT
730     , _saved_code_length(0)
731 #endif
732   { }
733 
734   ~AdapterHandlerEntry();
735 
736  public:
737   address get_i2c_entry()                   const { return _i2c_entry; }
738   address get_c2i_entry()                   const { return _c2i_entry; }
739   address get_c2i_inline_entry()            const { return _c2i_inline_entry; }
740   address get_c2i_inline_ro_entry()         const { return _c2i_inline_ro_entry; }
741   address get_c2i_unverified_entry()        const { return _c2i_unverified_entry; }
742   address get_c2i_unverified_inline_entry() const { return _c2i_unverified_inline_entry; }
743   address get_c2i_no_clinit_check_entry()   const { return _c2i_no_clinit_check_entry; }
744 
745   address base_address();
746   void relocate(address new_base);
747 
748   // Support for scalarized inline type calling convention
749   void set_sig_cc(const GrowableArray<SigEntry>* sig)  { _sig_cc = sig; }
750   const GrowableArray<SigEntry>* get_sig_cc()    const { return _sig_cc; }
751 
752   AdapterFingerPrint* fingerprint() const { return _fingerprint; }
753 
754 #ifdef ASSERT
755   // Used to verify that code generated for shared adapters is equivalent
756   void save_code   (unsigned char* code, int length);
757   bool compare_code(AdapterHandlerEntry* other);
758 #endif
759 
760   //virtual void print_on(outputStream* st) const;  DO NOT USE
761   void print_adapter_on(outputStream* st) const;
762 };
763 
764 class CompiledEntrySignature;
765 
766 class AdapterHandlerLibrary: public AllStatic {
767   friend class SharedRuntime;
768  private:
769   static BufferBlob* _buffer; // the temporary code buffer in CodeCache
770   static AdapterHandlerEntry* _abstract_method_handler;
771   static AdapterHandlerEntry* _no_arg_handler;
772   static AdapterHandlerEntry* _int_arg_handler;
773   static AdapterHandlerEntry* _obj_arg_handler;
774   static AdapterHandlerEntry* _obj_int_arg_handler;
775   static AdapterHandlerEntry* _obj_obj_arg_handler;
776 
777   static BufferBlob* buffer_blob();
778   static void initialize();
779   static AdapterHandlerEntry* create_adapter(AdapterBlob*& new_adapter,
780                                              CompiledEntrySignature& ces,

781                                              bool allocate_code_blob);
782   static AdapterHandlerEntry* get_simple_adapter(const methodHandle& method);
783  public:
784 
785   static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
786                                         address i2c_entry, address c2i_entry, address c2i_inline_entry, address c2i_inline_ro_entry,
787                                         address c2i_unverified_entry, address c2i_unverified_inline_entry, address c2i_no_clinit_check_entry = nullptr);


788   static void create_native_wrapper(const methodHandle& method);
789   static AdapterHandlerEntry* get_adapter(const methodHandle& method);
790 
791   static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
792   static void print_handler_on(outputStream* st, const CodeBlob* b);
793   static bool contains(const CodeBlob* b);
794 #ifndef PRODUCT
795   static void print_statistics();
796 #endif // PRODUCT
797 
798 };
799 
800 // Utility class for computing the calling convention of the 3 types
801 // of compiled method entries:
802 //     Method::_from_compiled_entry               - sig_cc
803 //     Method::_from_compiled_inline_ro_entry     - sig_cc_ro
804 //     Method::_from_compiled_inline_entry        - sig
805 class CompiledEntrySignature : public StackObj {
806   Method* _method;
807   int  _num_inline_args;
808   bool _has_inline_recv;
809   GrowableArray<SigEntry>* _sig;
810   GrowableArray<SigEntry>* _sig_cc;
811   GrowableArray<SigEntry>* _sig_cc_ro;
812   VMRegPair* _regs;
813   VMRegPair* _regs_cc;
814   VMRegPair* _regs_cc_ro;
815 
816   int _args_on_stack;
817   int _args_on_stack_cc;
818   int _args_on_stack_cc_ro;
819 
820   bool _c1_needs_stack_repair;
821   bool _c2_needs_stack_repair;
822 
823   GrowableArray<Method*>* _supers;
824 
825 public:
826   Method* method()                     const { return _method; }
827 
828   // Used by Method::_from_compiled_inline_entry
829   GrowableArray<SigEntry>* sig()       const { return _sig; }
830 
831   // Used by Method::_from_compiled_entry
832   GrowableArray<SigEntry>* sig_cc()    const { return _sig_cc; }
833 
834   // Used by Method::_from_compiled_inline_ro_entry
835   GrowableArray<SigEntry>* sig_cc_ro() const { return _sig_cc_ro; }
836 
837   VMRegPair* regs()                    const { return _regs; }
838   VMRegPair* regs_cc()                 const { return _regs_cc; }
839   VMRegPair* regs_cc_ro()              const { return _regs_cc_ro; }
840 
841   int args_on_stack()                  const { return _args_on_stack; }
842   int args_on_stack_cc()               const { return _args_on_stack_cc; }
843   int args_on_stack_cc_ro()            const { return _args_on_stack_cc_ro; }
844 
845   int  num_inline_args()               const { return _num_inline_args; }
846   bool has_inline_recv()               const { return _has_inline_recv; }
847 
848   bool has_scalarized_args()           const { return _sig != _sig_cc; }
849   bool c1_needs_stack_repair()         const { return _c1_needs_stack_repair; }
850   bool c2_needs_stack_repair()         const { return _c2_needs_stack_repair; }
851   CodeOffsets::Entries c1_inline_ro_entry_type() const;
852 
853   GrowableArray<Method*>* get_supers();
854 
855   CompiledEntrySignature(Method* method = nullptr);
856   void compute_calling_conventions(bool init = true);
857 };
858 
859 #endif // SHARE_RUNTIME_SHAREDRUNTIME_HPP
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