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 "classfile/compactHashtable.hpp"
29 #include "code/codeBlob.hpp"
30 #include "code/vmreg.hpp"
31 #include "interpreter/linkResolver.hpp"
32 #include "memory/allStatic.hpp"
33 #include "memory/metaspaceClosure.hpp"
34 #include "memory/resourceArea.hpp"
35 #include "runtime/stubDeclarations.hpp"
36 #include "utilities/macros.hpp"
37
38 class AdapterHandlerEntry;
39 class AdapterFingerPrint;
40 class vframeStream;
41
42 // Runtime is the base class for various runtime interfaces
43 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
44 // shared functionality such as exception forwarding (C++ to
45 // Java exceptions), locking/unlocking mechanisms, statistical
46 // information, etc.
47
48 // define SharedStubId enum tags: wrong_method_id, etc
49
50 #define SHARED_STUB_ID_ENUM_DECLARE(name, type) STUB_ID_NAME(name),
51 enum class SharedStubId :int {
52 NO_STUBID = -1,
53 SHARED_STUBS_DO(SHARED_STUB_ID_ENUM_DECLARE)
54 NUM_STUBIDS
55 };
56 #undef SHARED_STUB_ID_ENUM_DECLARE
57
58 class SharedRuntime: AllStatic {
59 private:
60 // Declare shared stub fields
371 // on top of the stack.
372 // The caller (or one of its callers) must use a ResourceMark
373 // in order to correctly free the result.
374 //
375 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
376
377 // Fill in the "X cannot be cast to a Y" message for ClassCastException
378 //
379 // @param caster_klass the class of the object we are casting
380 // @param target_klass the target klass attempt
381 // @return the dynamically allocated exception message (must be freed
382 // by the caller using a resource mark)
383 //
384 // This version does not require access the frame, so it can be called
385 // from interpreted code
386 // The caller (or one of it's callers) must use a ResourceMark
387 // in order to correctly free the result.
388 //
389 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = nullptr);
390
391 // Resolves a call site- may patch in the destination of the call into the
392 // compiled code.
393 static methodHandle resolve_helper(bool is_virtual, bool is_optimized, TRAPS);
394
395 private:
396 // deopt blob
397 static void generate_deopt_blob(void);
398
399 static bool handle_ic_miss_helper_internal(Handle receiver, nmethod* caller_nm, const frame& caller_frame,
400 methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info,
401 bool& needs_ic_stub_refill, TRAPS);
402
403 public:
404 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
405
406 // Resets a call-site in compiled code so it will get resolved again.
407 static methodHandle reresolve_call_site(TRAPS);
408
409 // In the code prolog, if the klass comparison fails, the inline cache
410 // misses and the call site is patched to megamorphic
411 static methodHandle handle_ic_miss_helper(TRAPS);
412
413 // Find the method that called us.
414 static methodHandle find_callee_method(TRAPS);
415
416 static void monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* thread);
417
418 static void monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current);
419
420 // Issue UL warning for unlocked JNI monitor on virtual thread termination
421 static void log_jni_monitor_still_held();
422
423 private:
424 static Handle find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
425 static Handle find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
426
427 static Method* extract_attached_method(vframeStream& vfst);
428
429 #if defined(X86) && defined(COMPILER1)
430 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
431 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
432 #endif // X86 && COMPILER1
433
434 public:
435
436 // Read the array of BasicTypes from a Java signature, and compute where
437 // compiled Java code would like to put the results. Values in reg_lo and
438 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
439 // registers, those above refer to 4-byte stack slots. All stack slots are
440 // based off of the window top. SharedInfo::stack0 refers to the first usable
441 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
442 // 4-bytes higher.
443 // return value is the maximum number of VMReg stack slots the convention will use.
444 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
445
446 static void check_member_name_argument_is_last_argument(const methodHandle& method,
447 const BasicType* sig_bt,
448 const VMRegPair* regs) NOT_DEBUG_RETURN;
449
450 // Ditto except for calling C
451 //
452 // C argument in register AND stack slot.
453 // Some architectures require that an argument must be passed in a register
454 // AND in a stack slot. These architectures provide a second VMRegPair array
455 // to be filled by the c_calling_convention method. On other architectures,
456 // null is being passed as the second VMRegPair array, so arguments are either
457 // passed in a register OR in a stack slot.
458 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
459
460 static int vector_calling_convention(VMRegPair *regs,
461 uint num_bits,
462 uint total_args_passed);
463
464 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
471 // by the time we reach the blob there is compiled code available. This allows
472 // the blob to pass the incoming stack pointer (the sender sp) in a known
473 // location for the interpreter to record. This is used by the frame code
474 // to correct the sender code to match up with the stack pointer when the
475 // thread left the compiled code. In addition it allows the interpreter
476 // to remove the space the c2i adapter allocated to do its argument conversion.
477
478 // Although a c2i blob will always run interpreted even if compiled code is
479 // present if we see that compiled code is present the compiled call site
480 // will be patched/re-resolved so that later calls will run compiled.
481
482 // Additionally a c2i blob need to have a unverified entry because it can be reached
483 // in situations where the call site is an inlined cache site and may go megamorphic.
484
485 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
486 // that the interpreter before it does any call dispatch will record the current
487 // stack pointer in the interpreter frame. On return it will restore the stack
488 // pointer as needed. This means the i2c adapter code doesn't need any special
489 // handshaking path with compiled code to keep the stack walking correct.
490
491 static void generate_i2c2i_adapters(MacroAssembler *_masm,
492 int total_args_passed,
493 int max_arg,
494 const BasicType *sig_bt,
495 const VMRegPair *regs,
496 AdapterHandlerEntry* handler);
497
498 static void gen_i2c_adapter(MacroAssembler *_masm,
499 int total_args_passed,
500 int comp_args_on_stack,
501 const BasicType *sig_bt,
502 const VMRegPair *regs);
503
504 // OSR support
505
506 // OSR_migration_begin will extract the jvm state from an interpreter
507 // frame (locals, monitors) and store the data in a piece of C heap
508 // storage. This then allows the interpreter frame to be removed from the
509 // stack and the OSR nmethod to be called. That method is called with a
510 // pointer to the C heap storage. This pointer is the return value from
511 // OSR_migration_begin.
512
513 static intptr_t* OSR_migration_begin(JavaThread *thread);
514
515 // OSR_migration_end is a trivial routine. It is called after the compiled
516 // method has extracted the jvm state from the C heap that OSR_migration_begin
517 // created. It's entire job is to simply free this storage.
518 static void OSR_migration_end(intptr_t* buf);
519
520 // Convert a sig into a calling convention register layout
521 // and find interesting things about it.
554 //
555 // The wrapper may contain special-case code if the given method
556 // is a compiled method handle adapter, such as _invokeBasic, _linkToVirtual, etc.
557 static nmethod* generate_native_wrapper(MacroAssembler* masm,
558 const methodHandle& method,
559 int compile_id,
560 BasicType* sig_bt,
561 VMRegPair* regs,
562 BasicType ret_type);
563
564 // A compiled caller has just called the interpreter, but compiled code
565 // exists. Patch the caller so he no longer calls into the interpreter.
566 static void fixup_callers_callsite(Method* moop, address ret_pc);
567 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
568
569 // Slow-path Locking and Unlocking
570 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
571 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
572
573 // Resolving of calls
574 static address get_resolved_entry (JavaThread* current, methodHandle callee_method);
575 static address resolve_static_call_C (JavaThread* current);
576 static address resolve_virtual_call_C (JavaThread* current);
577 static address resolve_opt_virtual_call_C(JavaThread* current);
578
579 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
580 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
581 oopDesc* dest, jint dest_pos,
582 jint length, JavaThread* thread);
583
584 // handle ic miss with caller being compiled code
585 // wrong method handling (inline cache misses)
586 static address handle_wrong_method(JavaThread* current);
587 static address handle_wrong_method_abstract(JavaThread* current);
588 static address handle_wrong_method_ic_miss(JavaThread* current);
589
590 static address handle_unsafe_access(JavaThread* thread, address next_pc);
591
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
677 //
678 // The C2I flavor takes a stock compiled call setup plus the target method in
679 // Rmethod, marshals the arguments for an interpreted call and jumps to
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 MetaspaceObj {
694 friend class AdapterHandlerLibrary;
695
696 public:
697 static const int ENTRIES_COUNT = 4;
698
699 private:
700 AdapterFingerPrint* _fingerprint;
701 address _i2c_entry;
702 address _c2i_entry;
703 address _c2i_unverified_entry;
704 address _c2i_no_clinit_check_entry;
705 bool _linked;
706
707 static const char *_entry_names[];
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) :
717 _fingerprint(fingerprint),
718 _i2c_entry(nullptr),
719 _c2i_entry(nullptr),
720 _c2i_unverified_entry(nullptr),
721 _c2i_no_clinit_check_entry(nullptr),
722 _linked(false)
723 #ifdef ASSERT
724 , _saved_code(nullptr),
725 _saved_code_length(0)
726 #endif
727 { }
728
729 ~AdapterHandlerEntry();
730
731 // Allocate on CHeap instead of metaspace (see JDK-8331086).
732 // Dummy argument is used to avoid C++ warning about using
733 // deleted opearator MetaspaceObj::delete().
734 void* operator new(size_t size, size_t dummy) throw() {
735 assert(size == BytesPerWord * heap_word_size(sizeof(AdapterHandlerEntry)), "should match");
736 void* p = AllocateHeap(size, mtCode);
737 memset(p, 0, size);
738 return p;
739 }
740
741 public:
742 static AdapterHandlerEntry* allocate(AdapterFingerPrint* fingerprint) {
743 return new(0) AdapterHandlerEntry(fingerprint);
744 }
745
746 static void deallocate(AdapterHandlerEntry *handler) {
747 handler->~AdapterHandlerEntry();
748 }
749
750 void set_entry_points(address i2c_entry, address c2i_entry, address c2i_unverified_entry, address c2i_no_clinit_check_entry, bool linked = true) {
751 _i2c_entry = i2c_entry;
752 _c2i_entry = c2i_entry;
753 _c2i_unverified_entry = c2i_unverified_entry;
754 _c2i_no_clinit_check_entry = c2i_no_clinit_check_entry;
755 _linked = linked;
756 }
757
758 address get_i2c_entry() const { return _i2c_entry; }
759 address get_c2i_entry() const { return _c2i_entry; }
760 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
761 address get_c2i_no_clinit_check_entry() const { return _c2i_no_clinit_check_entry; }
762
763 static const char* entry_name(int i) {
764 assert(i >=0 && i < ENTRIES_COUNT, "entry id out of range");
765 return _entry_names[i];
766 }
767
768 bool is_linked() const { return _linked; }
769 address base_address();
770 void relocate(address new_base);
771
772 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
773
774 #ifdef ASSERT
775 // Used to verify that code generated for shared adapters is equivalent
776 void save_code (unsigned char* code, int length);
777 bool compare_code(AdapterHandlerEntry* other);
778 #endif
779
780 //virtual void print_on(outputStream* st) const; DO NOT USE
781 void print_adapter_on(outputStream* st) const;
782
783 void metaspace_pointers_do(MetaspaceClosure* it);
784 int size() const {return (int)heap_word_size(sizeof(AdapterHandlerEntry)); }
785 MetaspaceObj::Type type() const { return AdapterHandlerEntryType; }
786
787 void remove_unshareable_info() NOT_CDS_RETURN;
788 void link() NOT_CDS_RETURN;
789 };
790
791 #if INCLUDE_CDS
792 class ArchivedAdapterTable;
793 #endif // INCLUDE_CDS
794
795 class AdapterHandlerLibrary: public AllStatic {
796 friend class SharedRuntime;
797 private:
798 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
799 static AdapterHandlerEntry* _abstract_method_handler;
800 static AdapterHandlerEntry* _no_arg_handler;
801 static AdapterHandlerEntry* _int_arg_handler;
802 static AdapterHandlerEntry* _obj_arg_handler;
803 static AdapterHandlerEntry* _obj_int_arg_handler;
804 static AdapterHandlerEntry* _obj_obj_arg_handler;
805 #if INCLUDE_CDS
806 static ArchivedAdapterTable _aot_adapter_handler_table;
807 #endif // INCLUDE_CDS
808
809 static BufferBlob* buffer_blob();
810 static void initialize();
811 static AdapterHandlerEntry* get_simple_adapter(const methodHandle& method);
812 static AdapterBlob* lookup_aot_cache(AdapterHandlerEntry* handler);
813 static AdapterHandlerEntry* create_adapter(AdapterBlob*& new_adapter,
814 int total_args_passed,
815 BasicType* sig_bt,
816 bool is_transient = false);
817 static void create_abstract_method_handler();
818 static void lookup_simple_adapters() NOT_CDS_RETURN;
819 #ifndef PRODUCT
820 static void print_adapter_handler_info(outputStream* st, AdapterHandlerEntry* handler, AdapterBlob* adapter_blob);
821 #endif // PRODUCT
822 public:
823
824 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint);
825 static void create_native_wrapper(const methodHandle& method);
826 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
827 static AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt);
828 static bool generate_adapter_code(AdapterBlob*& adapter_blob,
829 AdapterHandlerEntry* handler,
830 int total_args_passed,
831 BasicType* sig_bt,
832 bool is_transient);
833
834 #ifdef ASSERT
835 static void verify_adapter_sharing(int total_args_passed, BasicType* sig_bt, AdapterHandlerEntry* cached);
836 #endif // ASSERT
837
838 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
839 static void print_handler_on(outputStream* st, const CodeBlob* b);
840 static bool contains(const CodeBlob* b);
841 static const char* name(AdapterFingerPrint* fingerprint);
842 static uint32_t id(AdapterFingerPrint* fingerprint);
843 #ifndef PRODUCT
844 static void print_statistics();
845 #endif // PRODUCT
846
847 static bool is_abstract_method_adapter(AdapterHandlerEntry* adapter);
848
849 static AdapterBlob* link_aot_adapter_handler(AdapterHandlerEntry* handler) NOT_CDS_RETURN_(nullptr);
850 static void dump_aot_adapter_table() NOT_CDS_RETURN;
851 static void serialize_shared_table_header(SerializeClosure* soc) NOT_CDS_RETURN;
852 static void link_aot_adapters() NOT_CDS_RETURN;
853 };
854
855 #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 "classfile/compactHashtable.hpp"
30 #include "code/codeBlob.hpp"
31 #include "code/vmreg.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "memory/allStatic.hpp"
34 #include "memory/metaspaceClosure.hpp"
35 #include "memory/resourceArea.hpp"
36 #include "runtime/signature.hpp"
37 #include "runtime/stubDeclarations.hpp"
38 #include "utilities/macros.hpp"
39
40 class AdapterHandlerEntry;
41 class AdapterFingerPrint;
42 class vframeStream;
43 class SigEntry;
44
45 // Runtime is the base class for various runtime interfaces
46 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
47 // shared functionality such as exception forwarding (C++ to
48 // Java exceptions), locking/unlocking mechanisms, statistical
49 // information, etc.
50
51 // define SharedStubId enum tags: wrong_method_id, etc
52
53 #define SHARED_STUB_ID_ENUM_DECLARE(name, type) STUB_ID_NAME(name),
54 enum class SharedStubId :int {
55 NO_STUBID = -1,
56 SHARED_STUBS_DO(SHARED_STUB_ID_ENUM_DECLARE)
57 NUM_STUBIDS
58 };
59 #undef SHARED_STUB_ID_ENUM_DECLARE
60
61 class SharedRuntime: AllStatic {
62 private:
63 // Declare shared stub fields
374 // on top of the stack.
375 // The caller (or one of its callers) must use a ResourceMark
376 // in order to correctly free the result.
377 //
378 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
379
380 // Fill in the "X cannot be cast to a Y" message for ClassCastException
381 //
382 // @param caster_klass the class of the object we are casting
383 // @param target_klass the target klass attempt
384 // @return the dynamically allocated exception message (must be freed
385 // by the caller using a resource mark)
386 //
387 // This version does not require access the frame, so it can be called
388 // from interpreted code
389 // The caller (or one of it's callers) must use a ResourceMark
390 // in order to correctly free the result.
391 //
392 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = nullptr);
393
394 static char* generate_identity_exception_message(JavaThread* thr, Klass* klass);
395
396 // Resolves a call site- may patch in the destination of the call into the
397 // compiled code.
398 static methodHandle resolve_helper(bool is_virtual, bool is_optimized, bool& caller_is_c1, TRAPS);
399
400 private:
401 // deopt blob
402 static void generate_deopt_blob(void);
403
404 static bool handle_ic_miss_helper_internal(Handle receiver, nmethod* caller_nm, const frame& caller_frame,
405 methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info,
406 bool& needs_ic_stub_refill, bool& is_optimized, bool caller_is_c1, TRAPS);
407
408 public:
409 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
410
411 // Resets a call-site in compiled code so it will get resolved again.
412 static methodHandle reresolve_call_site(bool& is_static_call, bool& is_optimized, bool& caller_is_c1, TRAPS);
413
414 // In the code prolog, if the klass comparison fails, the inline cache
415 // misses and the call site is patched to megamorphic
416 static methodHandle handle_ic_miss_helper(bool& is_optimized, bool& caller_is_c1, TRAPS);
417
418 // Find the method that called us.
419 static methodHandle find_callee_method(bool is_optimized, bool& caller_is_c1, TRAPS);
420
421 static void monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* thread);
422
423 static void monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current);
424
425 // Issue UL warning for unlocked JNI monitor on virtual thread termination
426 static void log_jni_monitor_still_held();
427
428 private:
429 static Handle find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
430 static Handle find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
431
432 static Method* extract_attached_method(vframeStream& vfst);
433
434 #if defined(X86) && defined(COMPILER1)
435 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
436 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
437 #endif // X86 && COMPILER1
438
439 public:
440
441 // Read the array of BasicTypes from a Java signature, and compute where
442 // compiled Java code would like to put the results. Values in reg_lo and
443 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
444 // registers, those above refer to 4-byte stack slots. All stack slots are
445 // based off of the window top. SharedInfo::stack0 refers to the first usable
446 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
447 // 4-bytes higher.
448 // return value is the maximum number of VMReg stack slots the convention will use.
449 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
450 static int java_calling_convention(const GrowableArray<SigEntry>* sig, VMRegPair* regs) {
451 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sig->length());
452 int total_args_passed = SigEntry::fill_sig_bt(sig, sig_bt);
453 return java_calling_convention(sig_bt, regs, total_args_passed);
454 }
455 static int java_return_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
456 static const uint java_return_convention_max_int;
457 static const uint java_return_convention_max_float;
458
459 static void check_member_name_argument_is_last_argument(const methodHandle& method,
460 const BasicType* sig_bt,
461 const VMRegPair* regs) NOT_DEBUG_RETURN;
462
463 // Ditto except for calling C
464 //
465 // C argument in register AND stack slot.
466 // Some architectures require that an argument must be passed in a register
467 // AND in a stack slot. These architectures provide a second VMRegPair array
468 // to be filled by the c_calling_convention method. On other architectures,
469 // null is being passed as the second VMRegPair array, so arguments are either
470 // passed in a register OR in a stack slot.
471 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
472
473 static int vector_calling_convention(VMRegPair *regs,
474 uint num_bits,
475 uint total_args_passed);
476
477 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
484 // by the time we reach the blob there is compiled code available. This allows
485 // the blob to pass the incoming stack pointer (the sender sp) in a known
486 // location for the interpreter to record. This is used by the frame code
487 // to correct the sender code to match up with the stack pointer when the
488 // thread left the compiled code. In addition it allows the interpreter
489 // to remove the space the c2i adapter allocated to do its argument conversion.
490
491 // Although a c2i blob will always run interpreted even if compiled code is
492 // present if we see that compiled code is present the compiled call site
493 // will be patched/re-resolved so that later calls will run compiled.
494
495 // Additionally a c2i blob need to have a unverified entry because it can be reached
496 // in situations where the call site is an inlined cache site and may go megamorphic.
497
498 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
499 // that the interpreter before it does any call dispatch will record the current
500 // stack pointer in the interpreter frame. On return it will restore the stack
501 // pointer as needed. This means the i2c adapter code doesn't need any special
502 // handshaking path with compiled code to keep the stack walking correct.
503
504 static void generate_i2c2i_adapters(MacroAssembler* _masm,
505 int total_args_passed,
506 const GrowableArray<SigEntry>* sig,
507 const VMRegPair* regs,
508 const GrowableArray<SigEntry>* sig_cc,
509 const VMRegPair* regs_cc,
510 const GrowableArray<SigEntry>* sig_cc_ro,
511 const VMRegPair* regs_cc_ro,
512 AdapterHandlerEntry* handler,
513 AdapterBlob*& new_adapter,
514 bool allocate_code_blob);
515
516 static void gen_i2c_adapter(MacroAssembler *_masm,
517 int comp_args_on_stack,
518 const GrowableArray<SigEntry>* sig,
519 const VMRegPair *regs);
520
521 // OSR support
522
523 // OSR_migration_begin will extract the jvm state from an interpreter
524 // frame (locals, monitors) and store the data in a piece of C heap
525 // storage. This then allows the interpreter frame to be removed from the
526 // stack and the OSR nmethod to be called. That method is called with a
527 // pointer to the C heap storage. This pointer is the return value from
528 // OSR_migration_begin.
529
530 static intptr_t* OSR_migration_begin(JavaThread *thread);
531
532 // OSR_migration_end is a trivial routine. It is called after the compiled
533 // method has extracted the jvm state from the C heap that OSR_migration_begin
534 // created. It's entire job is to simply free this storage.
535 static void OSR_migration_end(intptr_t* buf);
536
537 // Convert a sig into a calling convention register layout
538 // and find interesting things about it.
571 //
572 // The wrapper may contain special-case code if the given method
573 // is a compiled method handle adapter, such as _invokeBasic, _linkToVirtual, etc.
574 static nmethod* generate_native_wrapper(MacroAssembler* masm,
575 const methodHandle& method,
576 int compile_id,
577 BasicType* sig_bt,
578 VMRegPair* regs,
579 BasicType ret_type);
580
581 // A compiled caller has just called the interpreter, but compiled code
582 // exists. Patch the caller so he no longer calls into the interpreter.
583 static void fixup_callers_callsite(Method* moop, address ret_pc);
584 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
585
586 // Slow-path Locking and Unlocking
587 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
588 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
589
590 // Resolving of calls
591 static address get_resolved_entry (JavaThread* current, methodHandle callee_method,
592 bool is_static_call, bool is_optimized, bool caller_is_c1);
593 static address resolve_static_call_C (JavaThread* current);
594 static address resolve_virtual_call_C (JavaThread* current);
595 static address resolve_opt_virtual_call_C(JavaThread* current);
596
597 static void load_inline_type_fields_in_regs(JavaThread* current, oopDesc* res);
598 static void store_inline_type_fields_to_buf(JavaThread* current, intptr_t res);
599
600 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
601 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
602 oopDesc* dest, jint dest_pos,
603 jint length, JavaThread* thread);
604
605 // handle ic miss with caller being compiled code
606 // wrong method handling (inline cache misses)
607 static address handle_wrong_method(JavaThread* current);
608 static address handle_wrong_method_abstract(JavaThread* current);
609 static address handle_wrong_method_ic_miss(JavaThread* current);
610 static void allocate_inline_types(JavaThread* current, Method* callee, bool allocate_receiver);
611 static oop allocate_inline_types_impl(JavaThread* current, methodHandle callee, bool allocate_receiver, TRAPS);
612
613 static address handle_unsafe_access(JavaThread* thread, address next_pc);
614
615 static BufferedInlineTypeBlob* generate_buffered_inline_type_adapter(const InlineKlass* vk);
616 #ifndef PRODUCT
617
618 // Collect and print inline cache miss statistics
619 private:
620 enum { maxICmiss_count = 100 };
621 static int _ICmiss_index; // length of IC miss histogram
622 static int _ICmiss_count[maxICmiss_count]; // miss counts
623 static address _ICmiss_at[maxICmiss_count]; // miss addresses
624 static void trace_ic_miss(address at);
625
626 public:
627 static uint _ic_miss_ctr; // total # of IC misses
628 static uint _wrong_method_ctr;
629 static uint _resolve_static_ctr;
630 static uint _resolve_virtual_ctr;
631 static uint _resolve_opt_virtual_ctr;
632 static uint _implicit_null_throws;
633 static uint _implicit_div0_throws;
634
635 static uint _jbyte_array_copy_ctr; // Slow-path byte array copy
701 //
702 // The C2I flavor takes a stock compiled call setup plus the target method in
703 // Rmethod, marshals the arguments for an interpreted call and jumps to
704 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
705 // setup. Compiled frames are fixed-size and the args are likely not in the
706 // right place. Hence all the args will likely be copied into the
707 // interpreter's frame, forcing that frame to grow. The compiled frame's
708 // outgoing stack args will be dead after the copy.
709 //
710 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
711 // also perform an official frame push & pop. They have a call to the native
712 // routine in their middles and end in a return (instead of ending in a jump).
713 // The native wrappers are stored in real nmethods instead of the BufferBlobs
714 // used by the adapters. The code generation happens here because it's very
715 // similar to what the adapters have to do.
716
717 class AdapterHandlerEntry : public MetaspaceObj {
718 friend class AdapterHandlerLibrary;
719
720 public:
721 static const int ENTRIES_COUNT = 7;
722
723 private:
724 AdapterFingerPrint* _fingerprint;
725 address _i2c_entry;
726 address _c2i_entry;
727 address _c2i_inline_entry;
728 address _c2i_inline_ro_entry;
729 address _c2i_unverified_entry;
730 address _c2i_unverified_inline_entry;
731 address _c2i_no_clinit_check_entry;
732 bool _linked;
733
734 static const char *_entry_names[];
735
736 // Support for scalarized inline type calling convention
737 const GrowableArray<SigEntry>* _sig_cc;
738
739 #ifdef ASSERT
740 // Captures code and signature used to generate this adapter when
741 // verifying adapter equivalence.
742 unsigned char* _saved_code;
743 int _saved_code_length;
744 #endif
745
746 AdapterHandlerEntry(AdapterFingerPrint* fingerprint) :
747 _fingerprint(fingerprint),
748 _i2c_entry(nullptr),
749 _c2i_entry(nullptr),
750 _c2i_inline_entry(nullptr),
751 _c2i_inline_ro_entry(nullptr),
752 _c2i_unverified_entry(nullptr),
753 _c2i_unverified_inline_entry(nullptr),
754 _c2i_no_clinit_check_entry(nullptr),
755 _linked(false),
756 _sig_cc(nullptr)
757 #ifdef ASSERT
758 , _saved_code(nullptr),
759 _saved_code_length(0)
760 #endif
761 { }
762
763 ~AdapterHandlerEntry();
764
765 // Allocate on CHeap instead of metaspace (see JDK-8331086).
766 // Dummy argument is used to avoid C++ warning about using
767 // deleted opearator MetaspaceObj::delete().
768 void* operator new(size_t size, size_t dummy) throw() {
769 assert(size == BytesPerWord * heap_word_size(sizeof(AdapterHandlerEntry)), "should match");
770 void* p = AllocateHeap(size, mtCode);
771 memset(p, 0, size);
772 return p;
773 }
774
775 public:
776 static AdapterHandlerEntry* allocate(AdapterFingerPrint* fingerprint) {
777 return new(0) AdapterHandlerEntry(fingerprint);
778 }
779
780 static void deallocate(AdapterHandlerEntry *handler) {
781 handler->~AdapterHandlerEntry();
782 }
783
784 void set_entry_points(address i2c_entry, address c2i_entry, address c2i_inline_entry, address c2i_inline_ro_entry,
785 address c2i_unverified_entry, address c2i_unverified_inline_entry,
786 address c2i_no_clinit_check_entry = nullptr,
787 bool linked = true) {
788 _i2c_entry = i2c_entry;
789 _c2i_entry = c2i_entry;
790 _c2i_inline_entry = c2i_inline_entry;
791 _c2i_inline_ro_entry = c2i_inline_ro_entry;
792 _c2i_unverified_entry = c2i_unverified_entry;
793 _c2i_unverified_inline_entry = c2i_unverified_inline_entry;
794 _c2i_no_clinit_check_entry = c2i_no_clinit_check_entry;
795 _linked = linked;
796 }
797
798 address get_i2c_entry() const { return _i2c_entry; }
799 address get_c2i_entry() const { return _c2i_entry; }
800 address get_c2i_inline_entry() const { return _c2i_inline_entry; }
801 address get_c2i_inline_ro_entry() const { return _c2i_inline_ro_entry; }
802 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
803 address get_c2i_unverified_inline_entry() const { return _c2i_unverified_inline_entry; }
804 address get_c2i_no_clinit_check_entry() const { return _c2i_no_clinit_check_entry; }
805
806 static const char* entry_name(int i) {
807 assert(i >=0 && i < ENTRIES_COUNT, "entry id out of range");
808 return _entry_names[i];
809 }
810
811 bool is_linked() const { return _linked; }
812 address base_address();
813 void relocate(address new_base);
814
815 // Support for scalarized inline type calling convention
816 void set_sig_cc(const GrowableArray<SigEntry>* sig) { _sig_cc = sig; }
817 const GrowableArray<SigEntry>* get_sig_cc() const { return _sig_cc; }
818
819 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
820
821 #ifdef ASSERT
822 // Used to verify that code generated for shared adapters is equivalent
823 void save_code (unsigned char* code, int length);
824 bool compare_code(AdapterHandlerEntry* other);
825 #endif
826
827 //virtual void print_on(outputStream* st) const; DO NOT USE
828 void print_adapter_on(outputStream* st) const;
829
830 void metaspace_pointers_do(MetaspaceClosure* it);
831 int size() const {return (int)heap_word_size(sizeof(AdapterHandlerEntry)); }
832 MetaspaceObj::Type type() const { return AdapterHandlerEntryType; }
833
834 void remove_unshareable_info() NOT_CDS_RETURN;
835 void link() NOT_CDS_RETURN;
836 };
837
838 #if INCLUDE_CDS
839 class ArchivedAdapterTable;
840 #endif // INCLUDE_CDS
841
842 class CompiledEntrySignature;
843
844 class AdapterHandlerLibrary: public AllStatic {
845 friend class SharedRuntime;
846 private:
847 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
848 static AdapterHandlerEntry* _abstract_method_handler;
849 static AdapterHandlerEntry* _no_arg_handler;
850 static AdapterHandlerEntry* _int_arg_handler;
851 static AdapterHandlerEntry* _obj_arg_handler;
852 static AdapterHandlerEntry* _obj_int_arg_handler;
853 static AdapterHandlerEntry* _obj_obj_arg_handler;
854 #if INCLUDE_CDS
855 static ArchivedAdapterTable _aot_adapter_handler_table;
856 #endif // INCLUDE_CDS
857
858 static BufferBlob* buffer_blob();
859 static void initialize();
860 static AdapterHandlerEntry* get_simple_adapter(const methodHandle& method);
861 static AdapterBlob* lookup_aot_cache(AdapterHandlerEntry* handler);
862 static AdapterHandlerEntry* create_adapter(AdapterBlob*& new_adapter,
863 CompiledEntrySignature& ces,
864 bool allocate_code_blob,
865 bool is_transient = false);
866 static void create_abstract_method_handler();
867 static void lookup_simple_adapters() NOT_CDS_RETURN;
868 #ifndef PRODUCT
869 static void print_adapter_handler_info(outputStream* st, AdapterHandlerEntry* handler, AdapterBlob* adapter_blob);
870 #endif // PRODUCT
871 public:
872
873 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint);
874 static void create_native_wrapper(const methodHandle& method);
875 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
876 static AdapterHandlerEntry* lookup(const GrowableArray<SigEntry>* sig, bool has_ro_adapter = false);
877 static bool generate_adapter_code(AdapterBlob*& adapter_blob,
878 AdapterHandlerEntry* handler,
879 CompiledEntrySignature& ces,
880 bool allocate_code_blob,
881 bool is_transient);
882
883 #ifdef ASSERT
884 static void verify_adapter_sharing(CompiledEntrySignature& ces, AdapterHandlerEntry* cached_entry);
885 #endif // ASSERT
886
887 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
888 static void print_handler_on(outputStream* st, const CodeBlob* b);
889 static bool contains(const CodeBlob* b);
890 static const char* name(AdapterFingerPrint* fingerprint);
891 static uint32_t id(AdapterFingerPrint* fingerprint);
892 #ifndef PRODUCT
893 static void print_statistics();
894 #endif // PRODUCT
895
896 static bool is_abstract_method_adapter(AdapterHandlerEntry* adapter);
897
898 static AdapterBlob* link_aot_adapter_handler(AdapterHandlerEntry* handler) NOT_CDS_RETURN_(nullptr);
899 static void dump_aot_adapter_table() NOT_CDS_RETURN;
900 static void serialize_shared_table_header(SerializeClosure* soc) NOT_CDS_RETURN;
901 static void link_aot_adapters() NOT_CDS_RETURN;
902 };
903
904 // Utility class for computing the calling convention of the 3 types
905 // of compiled method entries:
906 // Method::_from_compiled_entry - sig_cc
907 // Method::_from_compiled_inline_ro_entry - sig_cc_ro
908 // Method::_from_compiled_inline_entry - sig
909 class CompiledEntrySignature : public StackObj {
910 Method* _method;
911 int _num_inline_args;
912 bool _has_inline_recv;
913 GrowableArray<SigEntry>* _sig;
914 GrowableArray<SigEntry>* _sig_cc;
915 GrowableArray<SigEntry>* _sig_cc_ro;
916 VMRegPair* _regs;
917 VMRegPair* _regs_cc;
918 VMRegPair* _regs_cc_ro;
919
920 int _args_on_stack;
921 int _args_on_stack_cc;
922 int _args_on_stack_cc_ro;
923
924 bool _c1_needs_stack_repair;
925 bool _c2_needs_stack_repair;
926
927 GrowableArray<Method*>* _supers;
928
929 public:
930 Method* method() const { return _method; }
931
932 // Used by Method::_from_compiled_inline_entry
933 GrowableArray<SigEntry>* sig() const { return _sig; }
934
935 // Used by Method::_from_compiled_entry
936 GrowableArray<SigEntry>* sig_cc() const { return _sig_cc; }
937
938 // Used by Method::_from_compiled_inline_ro_entry
939 GrowableArray<SigEntry>* sig_cc_ro() const { return _sig_cc_ro; }
940
941 VMRegPair* regs() const { return _regs; }
942 VMRegPair* regs_cc() const { return _regs_cc; }
943 VMRegPair* regs_cc_ro() const { return _regs_cc_ro; }
944
945 int args_on_stack() const { return _args_on_stack; }
946 int args_on_stack_cc() const { return _args_on_stack_cc; }
947 int args_on_stack_cc_ro() const { return _args_on_stack_cc_ro; }
948
949 int num_inline_args() const { return _num_inline_args; }
950 bool has_inline_recv() const { return _has_inline_recv; }
951
952 bool has_scalarized_args() const { return _sig != _sig_cc; }
953 bool c1_needs_stack_repair() const { return _c1_needs_stack_repair; }
954 bool c2_needs_stack_repair() const { return _c2_needs_stack_repair; }
955 CodeOffsets::Entries c1_inline_ro_entry_type() const;
956
957 GrowableArray<Method*>* get_supers();
958
959 CompiledEntrySignature(Method* method = nullptr);
960 void compute_calling_conventions(bool init = true);
961 void initialize_from_fingerprint(AdapterFingerPrint* fingerprint);
962 };
963
964 #endif // SHARE_RUNTIME_SHAREDRUNTIME_HPP
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