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/safepointVerifiers.hpp"
36 #include "runtime/stubInfo.hpp"
37 #include "utilities/macros.hpp"
38
39 class AdapterHandlerEntry;
40 class AdapterFingerPrint;
41 class vframeStream;
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 class SharedRuntime: AllStatic {
50 private:
51 // Declare shared stub fields
52 #define SHARED_STUB_FIELD_DECLARE(name, type) \
53 static type* BLOB_FIELD_NAME(name);
54 SHARED_STUBS_DO(SHARED_STUB_FIELD_DECLARE)
55 #undef SHARED_STUB_FIELD_DECLARE
56
57 #ifdef ASSERT
58 static bool is_resolve_id(StubId id) {
59 return (id == StubId::shared_wrong_method_id ||
60 id == StubId::shared_wrong_method_abstract_id ||
61 id == StubId::shared_ic_miss_id ||
359 // on top of the stack.
360 // The caller (or one of its callers) must use a ResourceMark
361 // in order to correctly free the result.
362 //
363 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
364
365 // Fill in the "X cannot be cast to a Y" message for ClassCastException
366 //
367 // @param caster_klass the class of the object we are casting
368 // @param target_klass the target klass attempt
369 // @return the dynamically allocated exception message (must be freed
370 // by the caller using a resource mark)
371 //
372 // This version does not require access the frame, so it can be called
373 // from interpreted code
374 // The caller (or one of it's callers) must use a ResourceMark
375 // in order to correctly free the result.
376 //
377 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = nullptr);
378
379 // Resolves a call site- may patch in the destination of the call into the
380 // compiled code.
381 static methodHandle resolve_helper(bool is_virtual, bool is_optimized, TRAPS);
382
383 private:
384 // deopt blob
385 static void generate_deopt_blob(void);
386
387 static bool handle_ic_miss_helper_internal(Handle receiver, nmethod* caller_nm, const frame& caller_frame,
388 methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info,
389 bool& needs_ic_stub_refill, TRAPS);
390
391 public:
392 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
393
394 // Resets a call-site in compiled code so it will get resolved again.
395 static methodHandle reresolve_call_site(TRAPS);
396
397 // In the code prolog, if the klass comparison fails, the inline cache
398 // misses and the call site is patched to megamorphic
399 static methodHandle handle_ic_miss_helper(TRAPS);
400
401 // Find the method that called us.
402 static methodHandle find_callee_method(TRAPS);
403
404 static void monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* thread);
405
406 static void monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current);
407
408 private:
409 static Handle find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
410 static Handle find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
411
412 static Method* extract_attached_method(vframeStream& vfst);
413
414 #if defined(X86) && defined(COMPILER1)
415 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
416 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
417 #endif // X86 && COMPILER1
418
419 public:
420
421 // Read the array of BasicTypes from a Java signature, and compute where
422 // compiled Java code would like to put the results. Values in reg_lo and
423 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
424 // registers, those above refer to 4-byte stack slots. All stack slots are
425 // based off of the window top. SharedInfo::stack0 refers to the first usable
426 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
427 // 4-bytes higher.
428 // return value is the maximum number of VMReg stack slots the convention will use.
429 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
430
431 static void check_member_name_argument_is_last_argument(const methodHandle& method,
432 const BasicType* sig_bt,
433 const VMRegPair* regs) NOT_DEBUG_RETURN;
434
435 // Ditto except for calling C
436 //
437 // C argument in register AND stack slot.
438 // Some architectures require that an argument must be passed in a register
439 // AND in a stack slot. These architectures provide a second VMRegPair array
440 // to be filled by the c_calling_convention method. On other architectures,
441 // null is being passed as the second VMRegPair array, so arguments are either
442 // passed in a register OR in a stack slot.
443 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
444
445 static int vector_calling_convention(VMRegPair *regs,
446 uint num_bits,
447 uint total_args_passed);
448
449 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
456 // by the time we reach the blob there is compiled code available. This allows
457 // the blob to pass the incoming stack pointer (the sender sp) in a known
458 // location for the interpreter to record. This is used by the frame code
459 // to correct the sender code to match up with the stack pointer when the
460 // thread left the compiled code. In addition it allows the interpreter
461 // to remove the space the c2i adapter allocated to do its argument conversion.
462
463 // Although a c2i blob will always run interpreted even if compiled code is
464 // present if we see that compiled code is present the compiled call site
465 // will be patched/re-resolved so that later calls will run compiled.
466
467 // Additionally a c2i blob need to have a unverified entry because it can be reached
468 // in situations where the call site is an inlined cache site and may go megamorphic.
469
470 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
471 // that the interpreter before it does any call dispatch will record the current
472 // stack pointer in the interpreter frame. On return it will restore the stack
473 // pointer as needed. This means the i2c adapter code doesn't need any special
474 // handshaking path with compiled code to keep the stack walking correct.
475
476 static void generate_i2c2i_adapters(MacroAssembler *_masm,
477 int total_args_passed,
478 int max_arg,
479 const BasicType *sig_bt,
480 const VMRegPair *regs,
481 address entry_address[AdapterBlob::ENTRY_COUNT]);
482
483 static void gen_i2c_adapter(MacroAssembler *_masm,
484 int total_args_passed,
485 int comp_args_on_stack,
486 const BasicType *sig_bt,
487 const VMRegPair *regs);
488
489 // OSR support
490
491 // OSR_migration_begin will extract the jvm state from an interpreter
492 // frame (locals, monitors) and store the data in a piece of C heap
493 // storage. This then allows the interpreter frame to be removed from the
494 // stack and the OSR nmethod to be called. That method is called with a
495 // pointer to the C heap storage. This pointer is the return value from
496 // OSR_migration_begin.
497
498 static intptr_t* OSR_migration_begin(JavaThread *thread);
499
500 // OSR_migration_end is a trivial routine. It is called after the compiled
501 // method has extracted the jvm state from the C heap that OSR_migration_begin
502 // created. It's entire job is to simply free this storage.
503 static void OSR_migration_end(intptr_t* buf);
504
505 // Convert a sig into a calling convention register layout
506 // and find interesting things about it.
539 //
540 // The wrapper may contain special-case code if the given method
541 // is a compiled method handle adapter, such as _invokeBasic, _linkToVirtual, etc.
542 static nmethod* generate_native_wrapper(MacroAssembler* masm,
543 const methodHandle& method,
544 int compile_id,
545 BasicType* sig_bt,
546 VMRegPair* regs,
547 BasicType ret_type);
548
549 // A compiled caller has just called the interpreter, but compiled code
550 // exists. Patch the caller so he no longer calls into the interpreter.
551 static void fixup_callers_callsite(Method* moop, address ret_pc);
552 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
553
554 // Slow-path Locking and Unlocking
555 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
556 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
557
558 // Resolving of calls
559 static address get_resolved_entry (JavaThread* current, methodHandle callee_method);
560 static address resolve_static_call_C (JavaThread* current);
561 static address resolve_virtual_call_C (JavaThread* current);
562 static address resolve_opt_virtual_call_C(JavaThread* current);
563
564 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
565 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
566 oopDesc* dest, jint dest_pos,
567 jint length, JavaThread* thread);
568
569 // handle ic miss with caller being compiled code
570 // wrong method handling (inline cache misses)
571 static address handle_wrong_method(JavaThread* current);
572 static address handle_wrong_method_abstract(JavaThread* current);
573 static address handle_wrong_method_ic_miss(JavaThread* current);
574
575 static address handle_unsafe_access(JavaThread* thread, address next_pc);
576
577 #ifndef PRODUCT
578
579 // Collect and print inline cache miss statistics
580 private:
581 enum { maxICmiss_count = 100 };
582 static int _ICmiss_index; // length of IC miss histogram
583 static int _ICmiss_count[maxICmiss_count]; // miss counts
584 static address _ICmiss_at[maxICmiss_count]; // miss addresses
585 static void trace_ic_miss(address at);
586
587 public:
588 static uint _ic_miss_ctr; // total # of IC misses
589 static uint _wrong_method_ctr;
590 static uint _resolve_static_ctr;
591 static uint _resolve_virtual_ctr;
592 static uint _resolve_opt_virtual_ctr;
593 static uint _implicit_null_throws;
594 static uint _implicit_div0_throws;
595
596 static uint _jbyte_array_copy_ctr; // Slow-path byte array copy
695 //
696 // The C2I flavor takes a stock compiled call setup plus the target method in
697 // Rmethod, marshals the arguments for an interpreted call and jumps to
698 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
699 // setup. Compiled frames are fixed-size and the args are likely not in the
700 // right place. Hence all the args will likely be copied into the
701 // interpreter's frame, forcing that frame to grow. The compiled frame's
702 // outgoing stack args will be dead after the copy.
703 //
704 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
705 // also perform an official frame push & pop. They have a call to the native
706 // routine in their middles and end in a return (instead of ending in a jump).
707 // The native wrappers are stored in real nmethods instead of the BufferBlobs
708 // used by the adapters. The code generation happens here because it's very
709 // similar to what the adapters have to do.
710
711 class AdapterHandlerEntry : public MetaspaceObj {
712 friend class AdapterHandlerLibrary;
713
714 public:
715 static const int ENTRIES_COUNT = 4;
716
717 private:
718 AdapterFingerPrint* _fingerprint;
719 AdapterBlob* _adapter_blob;
720 uint _id;
721 bool _linked;
722
723 static const char *_entry_names[];
724
725 #ifdef ASSERT
726 // Captures code and signature used to generate this adapter when
727 // verifying adapter equivalence.
728 unsigned char* _saved_code;
729 int _saved_code_length;
730 #endif
731
732 AdapterHandlerEntry(int id, AdapterFingerPrint* fingerprint) :
733 _fingerprint(fingerprint),
734 _adapter_blob(nullptr),
735 _id(id),
736 _linked(false)
737 #ifdef ASSERT
738 , _saved_code(nullptr),
739 _saved_code_length(0)
740 #endif
741 { }
742
743 ~AdapterHandlerEntry();
744
745 // Allocate on CHeap instead of metaspace (see JDK-8331086).
746 // Dummy argument is used to avoid C++ warning about using
747 // deleted opearator MetaspaceObj::delete().
748 void* operator new(size_t size, size_t dummy) throw() {
749 assert(size == BytesPerWord * heap_word_size(sizeof(AdapterHandlerEntry)), "should match");
750 void* p = AllocateHeap(size, mtCode);
751 memset(p, 0, size);
752 return p;
753 }
754
755 public:
756 static AdapterHandlerEntry* allocate(uint id, AdapterFingerPrint* fingerprint) {
767 }
768
769 address get_i2c_entry() const {
770 #ifndef ZERO
771 assert(_adapter_blob != nullptr, "must be");
772 return _adapter_blob->i2c_entry();
773 #else
774 return nullptr;
775 #endif // ZERO
776 }
777
778 address get_c2i_entry() const {
779 #ifndef ZERO
780 assert(_adapter_blob != nullptr, "must be");
781 return _adapter_blob->c2i_entry();
782 #else
783 return nullptr;
784 #endif // ZERO
785 }
786
787 address get_c2i_unverified_entry() const {
788 #ifndef ZERO
789 assert(_adapter_blob != nullptr, "must be");
790 return _adapter_blob->c2i_unverified_entry();
791 #else
792 return nullptr;
793 #endif // ZERO
794 }
795
796 address get_c2i_no_clinit_check_entry() const {
797 #ifndef ZERO
798 assert(_adapter_blob != nullptr, "must be");
799 return _adapter_blob->c2i_no_clinit_check_entry();
800 #else
801 return nullptr;
802 #endif // ZERO
803 }
804
805 AdapterBlob* adapter_blob() const { return _adapter_blob; }
806 bool is_linked() const { return _linked; }
807
808 uint id() const { return _id; }
809 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
810
811 #ifdef ASSERT
812 // Used to verify that code generated for shared adapters is equivalent
813 void save_code (unsigned char* code, int length);
814 bool compare_code(AdapterHandlerEntry* other);
815 #endif
816
817 //virtual void print_on(outputStream* st) const; DO NOT USE
818 void print_adapter_on(outputStream* st) const;
819
820 void metaspace_pointers_do(MetaspaceClosure* it);
821 int size() const {return (int)heap_word_size(sizeof(AdapterHandlerEntry)); }
822 MetaspaceObj::Type type() const { return AdapterHandlerEntryType; }
823
824 void remove_unshareable_info() NOT_CDS_RETURN;
825 void link() NOT_CDS_RETURN;
826 };
827
828 #if INCLUDE_CDS
829 class ArchivedAdapterTable;
830 #endif // INCLUDE_CDS
831
832 class AdapterHandlerLibrary: public AllStatic {
833 friend class SharedRuntime;
834 private:
835 static volatile uint _id_counter; // counter for generating unique adapter ids, range = [1,UINT_MAX]
836 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
837 static AdapterHandlerEntry* _no_arg_handler;
838 static AdapterHandlerEntry* _int_arg_handler;
839 static AdapterHandlerEntry* _obj_arg_handler;
840 static AdapterHandlerEntry* _obj_int_arg_handler;
841 static AdapterHandlerEntry* _obj_obj_arg_handler;
842 #if INCLUDE_CDS
843 static ArchivedAdapterTable _aot_adapter_handler_table;
844 #endif // INCLUDE_CDS
845
846 static BufferBlob* buffer_blob();
847 static void initialize();
848 static AdapterHandlerEntry* get_simple_adapter(const methodHandle& method);
849 static void lookup_aot_cache(AdapterHandlerEntry* handler);
850 static AdapterHandlerEntry* create_adapter(int total_args_passed,
851 BasicType* sig_bt,
852 bool is_transient = false);
853 static void lookup_simple_adapters() NOT_CDS_RETURN;
854 #ifndef PRODUCT
855 static void print_adapter_handler_info(outputStream* st, AdapterHandlerEntry* handler);
856 #endif // PRODUCT
857 public:
858
859 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint);
860 static void create_native_wrapper(const methodHandle& method);
861 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
862 static AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt);
863 static bool generate_adapter_code(AdapterHandlerEntry* handler,
864 int total_args_passed,
865 BasicType* sig_bt,
866 bool is_transient);
867
868 #ifdef ASSERT
869 static void verify_adapter_sharing(int total_args_passed, BasicType* sig_bt, AdapterHandlerEntry* cached);
870 #endif // ASSERT
871
872 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
873 static void print_handler_on(outputStream* st, const CodeBlob* b);
874 static bool contains(const CodeBlob* b);
875 static const char* name(AdapterHandlerEntry* handler);
876 static uint32_t id(AdapterHandlerEntry* handler);
877 #ifndef PRODUCT
878 static void print_statistics();
879 #endif // PRODUCT
880
881 static void link_aot_adapter_handler(AdapterHandlerEntry* handler) NOT_CDS_RETURN;
882 static void dump_aot_adapter_table() NOT_CDS_RETURN;
883 static void serialize_shared_table_header(SerializeClosure* soc) NOT_CDS_RETURN;
884 static void link_aot_adapters() NOT_CDS_RETURN;
885 static void address_to_offset(address entry_address[AdapterBlob::ENTRY_COUNT], int entry_offset[AdapterBlob::ENTRY_COUNT]);
886 };
887
888 #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/safepointVerifiers.hpp"
37 #include "runtime/signature.hpp"
38 #include "runtime/stubInfo.hpp"
39 #include "utilities/macros.hpp"
40
41 class AdapterHandlerEntry;
42 class AdapterFingerPrint;
43 class vframeStream;
44 class SigEntry;
45
46 // Runtime is the base class for various runtime interfaces
47 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
48 // shared functionality such as exception forwarding (C++ to
49 // Java exceptions), locking/unlocking mechanisms, statistical
50 // information, etc.
51
52 class SharedRuntime: AllStatic {
53 private:
54 // Declare shared stub fields
55 #define SHARED_STUB_FIELD_DECLARE(name, type) \
56 static type* BLOB_FIELD_NAME(name);
57 SHARED_STUBS_DO(SHARED_STUB_FIELD_DECLARE)
58 #undef SHARED_STUB_FIELD_DECLARE
59
60 #ifdef ASSERT
61 static bool is_resolve_id(StubId id) {
62 return (id == StubId::shared_wrong_method_id ||
63 id == StubId::shared_wrong_method_abstract_id ||
64 id == StubId::shared_ic_miss_id ||
362 // on top of the stack.
363 // The caller (or one of its callers) must use a ResourceMark
364 // in order to correctly free the result.
365 //
366 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
367
368 // Fill in the "X cannot be cast to a Y" message for ClassCastException
369 //
370 // @param caster_klass the class of the object we are casting
371 // @param target_klass the target klass attempt
372 // @return the dynamically allocated exception message (must be freed
373 // by the caller using a resource mark)
374 //
375 // This version does not require access the frame, so it can be called
376 // from interpreted code
377 // The caller (or one of it's callers) must use a ResourceMark
378 // in order to correctly free the result.
379 //
380 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = nullptr);
381
382 static char* generate_identity_exception_message(JavaThread* thr, Klass* klass);
383
384 // Resolves a call site- may patch in the destination of the call into the
385 // compiled code.
386 static methodHandle resolve_helper(bool is_virtual, bool is_optimized, bool& caller_is_c1, TRAPS);
387
388 private:
389 // deopt blob
390 static void generate_deopt_blob(void);
391
392 static bool handle_ic_miss_helper_internal(Handle receiver, nmethod* caller_nm, const frame& caller_frame,
393 methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info,
394 bool& needs_ic_stub_refill, bool& is_optimized, bool caller_is_c1, TRAPS);
395
396 public:
397 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
398
399 // Resets a call-site in compiled code so it will get resolved again.
400 static methodHandle reresolve_call_site(bool& is_static_call, bool& is_optimized, bool& caller_is_c1, TRAPS);
401
402 // In the code prolog, if the klass comparison fails, the inline cache
403 // misses and the call site is patched to megamorphic
404 static methodHandle handle_ic_miss_helper(bool& caller_is_c1, TRAPS);
405
406 // Find the method that called us.
407 static methodHandle find_callee_method(bool& caller_is_c1, TRAPS);
408
409 static void monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* thread);
410
411 static void monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current);
412
413 private:
414 static Handle find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
415 static Handle find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
416
417 static Method* extract_attached_method(vframeStream& vfst);
418
419 #if defined(X86) && defined(COMPILER1)
420 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
421 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
422 #endif // X86 && COMPILER1
423
424 public:
425
426 // Read the array of BasicTypes from a Java signature, and compute where
427 // compiled Java code would like to put the results. Values in reg_lo and
428 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
429 // registers, those above refer to 4-byte stack slots. All stack slots are
430 // based off of the window top. SharedInfo::stack0 refers to the first usable
431 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
432 // 4-bytes higher.
433 // return value is the maximum number of VMReg stack slots the convention will use.
434 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
435 static int java_calling_convention(const GrowableArray<SigEntry>* sig, VMRegPair* regs) {
436 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sig->length());
437 int total_args_passed = SigEntry::fill_sig_bt(sig, sig_bt);
438 return java_calling_convention(sig_bt, regs, total_args_passed);
439 }
440 static int java_return_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
441 static const uint java_return_convention_max_int;
442 static const uint java_return_convention_max_float;
443
444 static void check_member_name_argument_is_last_argument(const methodHandle& method,
445 const BasicType* sig_bt,
446 const VMRegPair* regs) NOT_DEBUG_RETURN;
447
448 // Ditto except for calling C
449 //
450 // C argument in register AND stack slot.
451 // Some architectures require that an argument must be passed in a register
452 // AND in a stack slot. These architectures provide a second VMRegPair array
453 // to be filled by the c_calling_convention method. On other architectures,
454 // null is being passed as the second VMRegPair array, so arguments are either
455 // passed in a register OR in a stack slot.
456 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
457
458 static int vector_calling_convention(VMRegPair *regs,
459 uint num_bits,
460 uint total_args_passed);
461
462 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
469 // by the time we reach the blob there is compiled code available. This allows
470 // the blob to pass the incoming stack pointer (the sender sp) in a known
471 // location for the interpreter to record. This is used by the frame code
472 // to correct the sender code to match up with the stack pointer when the
473 // thread left the compiled code. In addition it allows the interpreter
474 // to remove the space the c2i adapter allocated to do its argument conversion.
475
476 // Although a c2i blob will always run interpreted even if compiled code is
477 // present if we see that compiled code is present the compiled call site
478 // will be patched/re-resolved so that later calls will run compiled.
479
480 // Additionally a c2i blob need to have a unverified entry because it can be reached
481 // in situations where the call site is an inlined cache site and may go megamorphic.
482
483 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
484 // that the interpreter before it does any call dispatch will record the current
485 // stack pointer in the interpreter frame. On return it will restore the stack
486 // pointer as needed. This means the i2c adapter code doesn't need any special
487 // handshaking path with compiled code to keep the stack walking correct.
488
489 static void generate_i2c2i_adapters(MacroAssembler* _masm,
490 int total_args_passed,
491 const GrowableArray<SigEntry>* sig,
492 const VMRegPair* regs,
493 const GrowableArray<SigEntry>* sig_cc,
494 const VMRegPair* regs_cc,
495 const GrowableArray<SigEntry>* sig_cc_ro,
496 const VMRegPair* regs_cc_ro,
497 address entry_address[AdapterBlob::ENTRY_COUNT],
498 AdapterBlob*& new_adapter,
499 bool allocate_code_blob);
500
501 static void gen_i2c_adapter(MacroAssembler *_masm,
502 int comp_args_on_stack,
503 const GrowableArray<SigEntry>* sig,
504 const VMRegPair *regs);
505
506 // OSR support
507
508 // OSR_migration_begin will extract the jvm state from an interpreter
509 // frame (locals, monitors) and store the data in a piece of C heap
510 // storage. This then allows the interpreter frame to be removed from the
511 // stack and the OSR nmethod to be called. That method is called with a
512 // pointer to the C heap storage. This pointer is the return value from
513 // OSR_migration_begin.
514
515 static intptr_t* OSR_migration_begin(JavaThread *thread);
516
517 // OSR_migration_end is a trivial routine. It is called after the compiled
518 // method has extracted the jvm state from the C heap that OSR_migration_begin
519 // created. It's entire job is to simply free this storage.
520 static void OSR_migration_end(intptr_t* buf);
521
522 // Convert a sig into a calling convention register layout
523 // and find interesting things about it.
556 //
557 // The wrapper may contain special-case code if the given method
558 // is a compiled method handle adapter, such as _invokeBasic, _linkToVirtual, etc.
559 static nmethod* generate_native_wrapper(MacroAssembler* masm,
560 const methodHandle& method,
561 int compile_id,
562 BasicType* sig_bt,
563 VMRegPair* regs,
564 BasicType ret_type);
565
566 // A compiled caller has just called the interpreter, but compiled code
567 // exists. Patch the caller so he no longer calls into the interpreter.
568 static void fixup_callers_callsite(Method* moop, address ret_pc);
569 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
570
571 // Slow-path Locking and Unlocking
572 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
573 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
574
575 // Resolving of calls
576 static address get_resolved_entry (JavaThread* current, methodHandle callee_method,
577 bool is_static_call, bool is_optimized, bool caller_is_c1);
578 static address resolve_static_call_C (JavaThread* current);
579 static address resolve_virtual_call_C (JavaThread* current);
580 static address resolve_opt_virtual_call_C(JavaThread* current);
581
582 static void load_inline_type_fields_in_regs(JavaThread* current, oopDesc* res);
583 static void store_inline_type_fields_to_buf(JavaThread* current, intptr_t res);
584
585 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
586 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
587 oopDesc* dest, jint dest_pos,
588 jint length, JavaThread* thread);
589
590 // handle ic miss with caller being compiled code
591 // wrong method handling (inline cache misses)
592 static address handle_wrong_method(JavaThread* current);
593 static address handle_wrong_method_abstract(JavaThread* current);
594 static address handle_wrong_method_ic_miss(JavaThread* current);
595 static void allocate_inline_types(JavaThread* current, Method* callee, bool allocate_receiver);
596 static oop allocate_inline_types_impl(JavaThread* current, methodHandle callee, bool allocate_receiver, TRAPS);
597
598 static address handle_unsafe_access(JavaThread* thread, address next_pc);
599
600 static BufferedInlineTypeBlob* generate_buffered_inline_type_adapter(const InlineKlass* vk);
601 #ifndef PRODUCT
602
603 // Collect and print inline cache miss statistics
604 private:
605 enum { maxICmiss_count = 100 };
606 static int _ICmiss_index; // length of IC miss histogram
607 static int _ICmiss_count[maxICmiss_count]; // miss counts
608 static address _ICmiss_at[maxICmiss_count]; // miss addresses
609 static void trace_ic_miss(address at);
610
611 public:
612 static uint _ic_miss_ctr; // total # of IC misses
613 static uint _wrong_method_ctr;
614 static uint _resolve_static_ctr;
615 static uint _resolve_virtual_ctr;
616 static uint _resolve_opt_virtual_ctr;
617 static uint _implicit_null_throws;
618 static uint _implicit_div0_throws;
619
620 static uint _jbyte_array_copy_ctr; // Slow-path byte array copy
719 //
720 // The C2I flavor takes a stock compiled call setup plus the target method in
721 // Rmethod, marshals the arguments for an interpreted call and jumps to
722 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
723 // setup. Compiled frames are fixed-size and the args are likely not in the
724 // right place. Hence all the args will likely be copied into the
725 // interpreter's frame, forcing that frame to grow. The compiled frame's
726 // outgoing stack args will be dead after the copy.
727 //
728 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
729 // also perform an official frame push & pop. They have a call to the native
730 // routine in their middles and end in a return (instead of ending in a jump).
731 // The native wrappers are stored in real nmethods instead of the BufferBlobs
732 // used by the adapters. The code generation happens here because it's very
733 // similar to what the adapters have to do.
734
735 class AdapterHandlerEntry : public MetaspaceObj {
736 friend class AdapterHandlerLibrary;
737
738 public:
739 static const int ENTRIES_COUNT = 7;
740
741 private:
742 AdapterFingerPrint* _fingerprint;
743 AdapterBlob* _adapter_blob;
744 uint _id;
745 bool _linked;
746
747 static const char *_entry_names[];
748
749 // Support for scalarized inline type calling convention
750 const GrowableArray<SigEntry>* _sig_cc;
751
752 #ifdef ASSERT
753 // Captures code and signature used to generate this adapter when
754 // verifying adapter equivalence.
755 unsigned char* _saved_code;
756 int _saved_code_length;
757 #endif
758
759 AdapterHandlerEntry(int id, AdapterFingerPrint* fingerprint) :
760 _fingerprint(fingerprint),
761 _adapter_blob(nullptr),
762 _id(id),
763 _linked(false),
764 _sig_cc(nullptr)
765 #ifdef ASSERT
766 , _saved_code(nullptr),
767 _saved_code_length(0)
768 #endif
769 { }
770
771 ~AdapterHandlerEntry();
772
773 // Allocate on CHeap instead of metaspace (see JDK-8331086).
774 // Dummy argument is used to avoid C++ warning about using
775 // deleted opearator MetaspaceObj::delete().
776 void* operator new(size_t size, size_t dummy) throw() {
777 assert(size == BytesPerWord * heap_word_size(sizeof(AdapterHandlerEntry)), "should match");
778 void* p = AllocateHeap(size, mtCode);
779 memset(p, 0, size);
780 return p;
781 }
782
783 public:
784 static AdapterHandlerEntry* allocate(uint id, AdapterFingerPrint* fingerprint) {
795 }
796
797 address get_i2c_entry() const {
798 #ifndef ZERO
799 assert(_adapter_blob != nullptr, "must be");
800 return _adapter_blob->i2c_entry();
801 #else
802 return nullptr;
803 #endif // ZERO
804 }
805
806 address get_c2i_entry() const {
807 #ifndef ZERO
808 assert(_adapter_blob != nullptr, "must be");
809 return _adapter_blob->c2i_entry();
810 #else
811 return nullptr;
812 #endif // ZERO
813 }
814
815 address get_c2i_inline_entry() const {
816 #ifndef ZERO
817 assert(_adapter_blob != nullptr, "must be");
818 return _adapter_blob->c2i_inline_entry();
819 #else
820 return nullptr;
821 #endif // ZERO
822 }
823
824 address get_c2i_inline_ro_entry() const {
825 #ifndef ZERO
826 assert(_adapter_blob != nullptr, "must be");
827 return _adapter_blob->c2i_inline_ro_entry();
828 #else
829 return nullptr;
830 #endif // ZERO
831 }
832
833 address get_c2i_unverified_entry() const {
834 #ifndef ZERO
835 assert(_adapter_blob != nullptr, "must be");
836 return _adapter_blob->c2i_unverified_entry();
837 #else
838 return nullptr;
839 #endif // ZERO
840 }
841
842 address get_c2i_unverified_inline_entry() const {
843 #ifndef ZERO
844 assert(_adapter_blob != nullptr, "must be");
845 return _adapter_blob->c2i_unverified_inline_entry();
846 #else
847 return nullptr;
848 #endif // ZERO
849 }
850
851 address get_c2i_no_clinit_check_entry() const {
852 #ifndef ZERO
853 assert(_adapter_blob != nullptr, "must be");
854 return _adapter_blob->c2i_no_clinit_check_entry();
855 #else
856 return nullptr;
857 #endif // ZERO
858 }
859
860 AdapterBlob* adapter_blob() const { return _adapter_blob; }
861 bool is_linked() const { return _linked; }
862
863 // Support for scalarized inline type calling convention
864 void set_sig_cc(const GrowableArray<SigEntry>* sig) { _sig_cc = sig; }
865 const GrowableArray<SigEntry>* get_sig_cc() const { return _sig_cc; }
866
867 uint id() const { return _id; }
868 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
869
870 #ifdef ASSERT
871 // Used to verify that code generated for shared adapters is equivalent
872 void save_code (unsigned char* code, int length);
873 bool compare_code(AdapterHandlerEntry* other);
874 #endif
875
876 //virtual void print_on(outputStream* st) const; DO NOT USE
877 void print_adapter_on(outputStream* st) const;
878
879 void metaspace_pointers_do(MetaspaceClosure* it);
880 int size() const {return (int)heap_word_size(sizeof(AdapterHandlerEntry)); }
881 MetaspaceObj::Type type() const { return AdapterHandlerEntryType; }
882
883 void remove_unshareable_info() NOT_CDS_RETURN;
884 void link() NOT_CDS_RETURN;
885 };
886
887 #if INCLUDE_CDS
888 class ArchivedAdapterTable;
889 #endif // INCLUDE_CDS
890
891 class CompiledEntrySignature;
892
893 class AdapterHandlerLibrary: public AllStatic {
894 friend class SharedRuntime;
895 private:
896 static volatile uint _id_counter; // counter for generating unique adapter ids, range = [1,UINT_MAX]
897 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
898 static AdapterHandlerEntry* _no_arg_handler;
899 static AdapterHandlerEntry* _int_arg_handler;
900 static AdapterHandlerEntry* _obj_arg_handler;
901 static AdapterHandlerEntry* _obj_int_arg_handler;
902 static AdapterHandlerEntry* _obj_obj_arg_handler;
903 #if INCLUDE_CDS
904 static ArchivedAdapterTable _aot_adapter_handler_table;
905 #endif // INCLUDE_CDS
906
907 static BufferBlob* buffer_blob();
908 static void initialize();
909 static AdapterHandlerEntry* get_simple_adapter(const methodHandle& method);
910 static void lookup_aot_cache(AdapterHandlerEntry* handler);
911 static AdapterHandlerEntry* create_adapter(CompiledEntrySignature& ces,
912 bool allocate_code_blob,
913 bool is_transient = false);
914 static void lookup_simple_adapters() NOT_CDS_RETURN;
915 #ifndef PRODUCT
916 static void print_adapter_handler_info(outputStream* st, AdapterHandlerEntry* handler);
917 #endif // PRODUCT
918 public:
919
920 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint);
921 static void create_native_wrapper(const methodHandle& method);
922 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
923 static AdapterHandlerEntry* lookup(const GrowableArray<SigEntry>* sig, bool has_ro_adapter = false);
924 static bool generate_adapter_code(AdapterHandlerEntry* handler,
925 CompiledEntrySignature& ces,
926 bool allocate_code_blob,
927 bool is_transient);
928
929 #ifdef ASSERT
930 static void verify_adapter_sharing(CompiledEntrySignature& ces, AdapterHandlerEntry* cached_entry);
931 #endif // ASSERT
932
933 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
934 static void print_handler_on(outputStream* st, const CodeBlob* b);
935 static bool contains(const CodeBlob* b);
936 static const char* name(AdapterHandlerEntry* handler);
937 static uint32_t id(AdapterHandlerEntry* handler);
938 #ifndef PRODUCT
939 static void print_statistics();
940 #endif // PRODUCT
941
942 static void link_aot_adapter_handler(AdapterHandlerEntry* handler) NOT_CDS_RETURN;
943 static void dump_aot_adapter_table() NOT_CDS_RETURN;
944 static void serialize_shared_table_header(SerializeClosure* soc) NOT_CDS_RETURN;
945 static void link_aot_adapters() NOT_CDS_RETURN;
946 static void address_to_offset(address entry_address[AdapterBlob::ENTRY_COUNT], int entry_offset[AdapterBlob::ENTRY_COUNT]);
947 };
948
949 // Utility class for computing the calling convention of the 3 types
950 // of compiled method entries:
951 // Method::_from_compiled_entry - sig_cc
952 // Method::_from_compiled_inline_ro_entry - sig_cc_ro
953 // Method::_from_compiled_inline_entry - sig
954 class CompiledEntrySignature : public StackObj {
955 Method* _method;
956 int _num_inline_args;
957 bool _has_inline_recv;
958 GrowableArray<SigEntry>* _sig;
959 GrowableArray<SigEntry>* _sig_cc;
960 GrowableArray<SigEntry>* _sig_cc_ro;
961 VMRegPair* _regs;
962 VMRegPair* _regs_cc;
963 VMRegPair* _regs_cc_ro;
964
965 int _args_on_stack;
966 int _args_on_stack_cc;
967 int _args_on_stack_cc_ro;
968
969 bool _c1_needs_stack_repair;
970 bool _c2_needs_stack_repair;
971
972 GrowableArray<Method*>* _supers;
973
974 public:
975 Method* method() const { return _method; }
976
977 // Used by Method::_from_compiled_inline_entry
978 GrowableArray<SigEntry>* sig() const { return _sig; }
979
980 // Used by Method::_from_compiled_entry
981 GrowableArray<SigEntry>* sig_cc() const { return _sig_cc; }
982
983 // Used by Method::_from_compiled_inline_ro_entry
984 GrowableArray<SigEntry>* sig_cc_ro() const { return _sig_cc_ro; }
985
986 VMRegPair* regs() const { return _regs; }
987 VMRegPair* regs_cc() const { return _regs_cc; }
988 VMRegPair* regs_cc_ro() const { return _regs_cc_ro; }
989
990 int args_on_stack() const { return _args_on_stack; }
991 int args_on_stack_cc() const { return _args_on_stack_cc; }
992 int args_on_stack_cc_ro() const { return _args_on_stack_cc_ro; }
993
994 int num_inline_args() const { return _num_inline_args; }
995 bool has_inline_recv() const { return _has_inline_recv; }
996
997 bool has_scalarized_args() const { return _sig != _sig_cc; }
998 bool c1_needs_stack_repair() const { return _c1_needs_stack_repair; }
999 bool c2_needs_stack_repair() const { return _c2_needs_stack_repair; }
1000 CodeOffsets::Entries c1_inline_ro_entry_type() const;
1001
1002 GrowableArray<Method*>* get_supers();
1003
1004 CompiledEntrySignature(Method* method = nullptr);
1005 void compute_calling_conventions(bool init = true);
1006 void initialize_from_fingerprint(AdapterFingerPrint* fingerprint);
1007 };
1008
1009 #endif // SHARE_RUNTIME_SHAREDRUNTIME_HPP
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