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 "interpreter/bytecodeHistogram.hpp"
29 #include "interpreter/bytecodeTracer.hpp"
30 #include "interpreter/linkResolver.hpp"
31 #include "memory/allocation.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "utilities/hashtable.hpp"
34 #include "utilities/macros.hpp"
35
36 class AdapterHandlerEntry;
37 class AdapterHandlerTable;
38 class AdapterFingerPrint;
39 class vframeStream;
40
41 // Runtime is the base class for various runtime interfaces
42 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
43 // shared functionality such as exception forwarding (C++ to
44 // Java exceptions), locking/unlocking mechanisms, statistical
45 // information, etc.
46
47 class SharedRuntime: AllStatic {
48 friend class VMStructs;
49
50 private:
51 static bool resolve_sub_helper_internal(methodHandle callee_method, const frame& caller_frame,
52 CompiledMethod* caller_nm, bool is_virtual, bool is_optimized,
53 Handle receiver, CallInfo& call_info, Bytecodes::Code invoke_code, TRAPS);
54 static methodHandle resolve_sub_helper(JavaThread *thread,
55 bool is_virtual,
56 bool is_optimized, TRAPS);
57
58 // Shared stub locations
59
67
68 static DeoptimizationBlob* _deopt_blob;
69
70 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob;
71 static SafepointBlob* _polling_page_safepoint_handler_blob;
72 static SafepointBlob* _polling_page_return_handler_blob;
73
74 #ifdef COMPILER2
75 static UncommonTrapBlob* _uncommon_trap_blob;
76 #endif // COMPILER2
77
78 #ifndef PRODUCT
79 // Counters
80 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
81 #endif // !PRODUCT
82
83 private:
84 enum { POLL_AT_RETURN, POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
85 static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
86 static RuntimeStub* generate_resolve_blob(address destination, const char* name);
87
88 public:
89 static void generate_stubs(void);
90
91 // max bytes for each dtrace string parameter
92 enum { max_dtrace_string_size = 256 };
93
94 // The following arithmetic routines are used on platforms that do
95 // not have machine instructions to implement their functionality.
96 // Do not remove these.
97
98 // long arithmetics
99 static jlong lmul(jlong y, jlong x);
100 static jlong ldiv(jlong y, jlong x);
101 static jlong lrem(jlong y, jlong x);
102
103 // float and double remainder
104 static jfloat frem(jfloat x, jfloat y);
105 static jdouble drem(jdouble x, jdouble y);
106
107
312 //
313 // This version does not require access the frame, so it can be called
314 // from interpreted code
315 // The caller (or one of it's callers) must use a ResourceMark
316 // in order to correctly free the result.
317 //
318 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = NULL);
319
320 // Resolves a call site- may patch in the destination of the call into the
321 // compiled code.
322 static methodHandle resolve_helper(JavaThread *thread,
323 bool is_virtual,
324 bool is_optimized, TRAPS);
325
326 private:
327 // deopt blob
328 static void generate_deopt_blob(void);
329
330 static bool handle_ic_miss_helper_internal(Handle receiver, CompiledMethod* caller_nm, const frame& caller_frame,
331 methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info,
332 bool& needs_ic_stub_refill, TRAPS);
333
334 public:
335 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
336
337 // Resets a call-site in compiled code so it will get resolved again.
338 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
339
340 // In the code prolog, if the klass comparison fails, the inline cache
341 // misses and the call site is patched to megamorphic
342 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
343
344 // Find the method that called us.
345 static methodHandle find_callee_method(JavaThread* thread, TRAPS);
346
347
348 private:
349 static Handle find_callee_info(JavaThread* thread,
350 Bytecodes::Code& bc,
351 CallInfo& callinfo, TRAPS);
352 static Handle find_callee_info_helper(JavaThread* thread,
353 vframeStream& vfst,
354 Bytecodes::Code& bc,
355 CallInfo& callinfo, TRAPS);
356
357 static methodHandle extract_attached_method(vframeStream& vfst);
358
359 static address clean_virtual_call_entry();
360 static address clean_opt_virtual_call_entry();
361 static address clean_static_call_entry();
362
363 #if defined(X86) && defined(COMPILER1)
364 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
365 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
366 #endif // X86 && COMPILER1
367
368 public:
369
370 // Read the array of BasicTypes from a Java signature, and compute where
371 // compiled Java code would like to put the results. Values in reg_lo and
372 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
373 // registers, those above refer to 4-byte stack slots. All stack slots are
374 // based off of the window top. SharedInfo::stack0 refers to the first usable
375 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
376 // 4-bytes higher. So for sparc because the register window save area is at
377 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
378 // will be just above it. (
379 // return value is the maximum number of VMReg stack slots the convention will use.
380 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);
381
382 static void check_member_name_argument_is_last_argument(const methodHandle& method,
383 const BasicType* sig_bt,
384 const VMRegPair* regs) NOT_DEBUG_RETURN;
385
386 // Ditto except for calling C
387 //
388 // C argument in register AND stack slot.
389 // Some architectures require that an argument must be passed in a register
390 // AND in a stack slot. These architectures provide a second VMRegPair array
391 // to be filled by the c_calling_convention method. On other architectures,
392 // NULL is being passed as the second VMRegPair array, so arguments are either
393 // passed in a register OR in a stack slot.
394 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
395 int total_args_passed);
396
397 static size_t trampoline_size();
398
399 static void generate_trampoline(MacroAssembler *masm, address destination);
400
408 // by the time we reach the blob there is compiled code available. This allows
409 // the blob to pass the incoming stack pointer (the sender sp) in a known
410 // location for the interpreter to record. This is used by the frame code
411 // to correct the sender code to match up with the stack pointer when the
412 // thread left the compiled code. In addition it allows the interpreter
413 // to remove the space the c2i adapter allocated to do its argument conversion.
414
415 // Although a c2i blob will always run interpreted even if compiled code is
416 // present if we see that compiled code is present the compiled call site
417 // will be patched/re-resolved so that later calls will run compiled.
418
419 // Additionally a c2i blob need to have a unverified entry because it can be reached
420 // in situations where the call site is an inlined cache site and may go megamorphic.
421
422 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
423 // that the interpreter before it does any call dispatch will record the current
424 // stack pointer in the interpreter frame. On return it will restore the stack
425 // pointer as needed. This means the i2c adapter code doesn't need any special
426 // handshaking path with compiled code to keep the stack walking correct.
427
428 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
429 int total_args_passed,
430 int max_arg,
431 const BasicType *sig_bt,
432 const VMRegPair *regs,
433 AdapterFingerPrint* fingerprint);
434
435 static void gen_i2c_adapter(MacroAssembler *_masm,
436 int total_args_passed,
437 int comp_args_on_stack,
438 const BasicType *sig_bt,
439 const VMRegPair *regs);
440
441 // OSR support
442
443 // OSR_migration_begin will extract the jvm state from an interpreter
444 // frame (locals, monitors) and store the data in a piece of C heap
445 // storage. This then allows the interpreter frame to be removed from the
446 // stack and the OSR nmethod to be called. That method is called with a
447 // pointer to the C heap storage. This pointer is the return value from
448 // OSR_migration_begin.
449
450 static intptr_t* OSR_migration_begin(JavaThread *thread);
451
452 // OSR_migration_end is a trivial routine. It is called after the compiled
453 // method has extracted the jvm state from the C heap that OSR_migration_begin
454 // created. It's entire job is to simply free this storage.
455 static void OSR_migration_end(intptr_t* buf);
456
457 // Convert a sig into a calling convention register layout
458 // and find interesting things about it.
494 static void block_for_jni_critical(JavaThread* thread);
495
496 // Pin/Unpin object
497 static oopDesc* pin_object(JavaThread* thread, oopDesc* obj);
498 static void unpin_object(JavaThread* thread, oopDesc* obj);
499
500 // A compiled caller has just called the interpreter, but compiled code
501 // exists. Patch the caller so he no longer calls into the interpreter.
502 static void fixup_callers_callsite(Method* moop, address ret_pc);
503 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
504
505 // Slow-path Locking and Unlocking
506 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
507 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
508
509 // Resolving of calls
510 static address resolve_static_call_C (JavaThread *thread);
511 static address resolve_virtual_call_C (JavaThread *thread);
512 static address resolve_opt_virtual_call_C(JavaThread *thread);
513
514 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
515 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
516 oopDesc* dest, jint dest_pos,
517 jint length, JavaThread* thread);
518
519 // handle ic miss with caller being compiled code
520 // wrong method handling (inline cache misses, zombie methods)
521 static address handle_wrong_method(JavaThread* thread);
522 static address handle_wrong_method_abstract(JavaThread* thread);
523 static address handle_wrong_method_ic_miss(JavaThread* thread);
524
525 static address handle_unsafe_access(JavaThread* thread, address next_pc);
526
527 #ifndef PRODUCT
528
529 // Collect and print inline cache miss statistics
530 private:
531 enum { maxICmiss_count = 100 };
532 static int _ICmiss_index; // length of IC miss histogram
533 static int _ICmiss_count[maxICmiss_count]; // miss counts
534 static address _ICmiss_at[maxICmiss_count]; // miss addresses
535 static void trace_ic_miss(address at);
536
537 public:
538 static int _throw_null_ctr; // throwing a null-pointer exception
539 static int _ic_miss_ctr; // total # of IC misses
540 static int _wrong_method_ctr;
541 static int _resolve_static_ctr;
542 static int _resolve_virtual_ctr;
543 static int _resolve_opt_virtual_ctr;
544 static int _implicit_null_throws;
545 static int _implicit_div0_throws;
546
621 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
622 // setup. Compiled frames are fixed-size and the args are likely not in the
623 // right place. Hence all the args will likely be copied into the
624 // interpreter's frame, forcing that frame to grow. The compiled frame's
625 // outgoing stack args will be dead after the copy.
626 //
627 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
628 // also perform an official frame push & pop. They have a call to the native
629 // routine in their middles and end in a return (instead of ending in a jump).
630 // The native wrappers are stored in real nmethods instead of the BufferBlobs
631 // used by the adapters. The code generation happens here because it's very
632 // similar to what the adapters have to do.
633
634 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
635 friend class AdapterHandlerTable;
636
637 private:
638 AdapterFingerPrint* _fingerprint;
639 address _i2c_entry;
640 address _c2i_entry;
641 address _c2i_unverified_entry;
642
643 #ifdef ASSERT
644 // Captures code and signature used to generate this adapter when
645 // verifying adapter equivalence.
646 unsigned char* _saved_code;
647 int _saved_code_length;
648 #endif
649
650 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
651 _fingerprint = fingerprint;
652 _i2c_entry = i2c_entry;
653 _c2i_entry = c2i_entry;
654 _c2i_unverified_entry = c2i_unverified_entry;
655 #ifdef ASSERT
656 _saved_code = NULL;
657 _saved_code_length = 0;
658 #endif
659 }
660
661 void deallocate();
662
663 // should never be used
664 AdapterHandlerEntry();
665
666 public:
667 address get_i2c_entry() const { return _i2c_entry; }
668 address get_c2i_entry() const { return _c2i_entry; }
669 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
670 address base_address();
671 void relocate(address new_base);
672
673 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
674
675 AdapterHandlerEntry* next() {
676 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
677 }
678
679 #ifdef ASSERT
680 // Used to verify that code generated for shared adapters is equivalent
681 void save_code (unsigned char* code, int length);
682 bool compare_code(unsigned char* code, int length);
683 #endif
684
685 //virtual void print_on(outputStream* st) const; DO NOT USE
686 void print_adapter_on(outputStream* st) const;
687 };
688
689 // This class is used only with DumpSharedSpaces==true. It holds extra information
690 // that's used only during CDS dump time.
691 // For details, see comments around Method::link_method()
692 class CDSAdapterHandlerEntry: public AdapterHandlerEntry {
695
696 public:
697 address get_c2i_entry_trampoline() const { return _c2i_entry_trampoline; }
698 AdapterHandlerEntry** get_adapter_trampoline() const { return _adapter_trampoline; }
699 void init() NOT_CDS_RETURN;
700 };
701
702
703 class AdapterHandlerLibrary: public AllStatic {
704 private:
705 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
706 static AdapterHandlerTable* _adapters;
707 static AdapterHandlerEntry* _abstract_method_handler;
708 static BufferBlob* buffer_blob();
709 static void initialize();
710 static AdapterHandlerEntry* get_adapter0(const methodHandle& method);
711
712 public:
713
714 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
715 address i2c_entry, address c2i_entry, address c2i_unverified_entry);
716 static void create_native_wrapper(const methodHandle& method);
717 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
718
719 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
720 static void print_handler_on(outputStream* st, const CodeBlob* b);
721 static bool contains(const CodeBlob* b);
722 #ifndef PRODUCT
723 static void print_statistics();
724 #endif // PRODUCT
725
726 };
727
728 #endif // SHARE_RUNTIME_SHAREDRUNTIME_HPP
|
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 "interpreter/bytecodeHistogram.hpp"
29 #include "interpreter/bytecodeTracer.hpp"
30 #include "interpreter/linkResolver.hpp"
31 #include "memory/allocation.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "runtime/signature.hpp"
34 #include "utilities/hashtable.hpp"
35 #include "utilities/macros.hpp"
36
37 class AdapterHandlerEntry;
38 class AdapterHandlerTable;
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 class SharedRuntime: AllStatic {
50 friend class VMStructs;
51
52 private:
53 static bool resolve_sub_helper_internal(methodHandle callee_method, const frame& caller_frame,
54 CompiledMethod* caller_nm, bool is_virtual, bool is_optimized,
55 Handle receiver, CallInfo& call_info, Bytecodes::Code invoke_code, TRAPS);
56 static methodHandle resolve_sub_helper(JavaThread *thread,
57 bool is_virtual,
58 bool is_optimized, TRAPS);
59
60 // Shared stub locations
61
69
70 static DeoptimizationBlob* _deopt_blob;
71
72 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob;
73 static SafepointBlob* _polling_page_safepoint_handler_blob;
74 static SafepointBlob* _polling_page_return_handler_blob;
75
76 #ifdef COMPILER2
77 static UncommonTrapBlob* _uncommon_trap_blob;
78 #endif // COMPILER2
79
80 #ifndef PRODUCT
81 // Counters
82 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
83 #endif // !PRODUCT
84
85 private:
86 enum { POLL_AT_RETURN, POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
87 static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
88 static RuntimeStub* generate_resolve_blob(address destination, const char* name);
89 static RuntimeStub* generate_return_value_blob(address destination, const char* name);
90 public:
91 static void generate_stubs(void);
92
93 // max bytes for each dtrace string parameter
94 enum { max_dtrace_string_size = 256 };
95
96 // The following arithmetic routines are used on platforms that do
97 // not have machine instructions to implement their functionality.
98 // Do not remove these.
99
100 // long arithmetics
101 static jlong lmul(jlong y, jlong x);
102 static jlong ldiv(jlong y, jlong x);
103 static jlong lrem(jlong y, jlong x);
104
105 // float and double remainder
106 static jfloat frem(jfloat x, jfloat y);
107 static jdouble drem(jdouble x, jdouble y);
108
109
314 //
315 // This version does not require access the frame, so it can be called
316 // from interpreted code
317 // The caller (or one of it's callers) must use a ResourceMark
318 // in order to correctly free the result.
319 //
320 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = NULL);
321
322 // Resolves a call site- may patch in the destination of the call into the
323 // compiled code.
324 static methodHandle resolve_helper(JavaThread *thread,
325 bool is_virtual,
326 bool is_optimized, TRAPS);
327
328 private:
329 // deopt blob
330 static void generate_deopt_blob(void);
331
332 static bool handle_ic_miss_helper_internal(Handle receiver, CompiledMethod* caller_nm, const frame& caller_frame,
333 methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info,
334 bool& needs_ic_stub_refill, bool& is_optimized, TRAPS);
335
336 public:
337 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
338
339 // Resets a call-site in compiled code so it will get resolved again.
340 static methodHandle reresolve_call_site(JavaThread *thread, bool& is_optimized, TRAPS);
341
342 // In the code prolog, if the klass comparison fails, the inline cache
343 // misses and the call site is patched to megamorphic
344 static methodHandle handle_ic_miss_helper(JavaThread* thread, bool& is_optimized, TRAPS);
345
346 // Find the method that called us.
347 static methodHandle find_callee_method(JavaThread* thread, TRAPS);
348
349
350 private:
351 static Handle find_callee_info(JavaThread* thread,
352 Bytecodes::Code& bc,
353 CallInfo& callinfo, TRAPS);
354 static Handle find_callee_info_helper(JavaThread* thread,
355 vframeStream& vfst,
356 Bytecodes::Code& bc,
357 CallInfo& callinfo, TRAPS);
358
359 static methodHandle extract_attached_method(vframeStream& vfst);
360
361 static address clean_virtual_call_entry();
362 static address clean_opt_virtual_call_entry();
363 static address clean_static_call_entry();
364
365 #if defined(X86) && defined(COMPILER1)
366 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
367 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
368 #endif // X86 && COMPILER1
369
370 public:
371
372 // Read the array of BasicTypes from a Java signature, and compute where
373 // compiled Java code would like to put the results. Values in reg_lo and
374 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
375 // registers, those above refer to 4-byte stack slots. All stack slots are
376 // based off of the window top. SharedInfo::stack0 refers to the first usable
377 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
378 // 4-bytes higher. So for sparc because the register window save area is at
379 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
380 // will be just above it. (
381 // return value is the maximum number of VMReg stack slots the convention will use.
382 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);
383 static int java_calling_convention(const GrowableArray<SigEntry>* sig, VMRegPair* regs) {
384 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sig->length());
385 int total_args_passed = SigEntry::fill_sig_bt(sig, sig_bt);
386 return java_calling_convention(sig_bt, regs, total_args_passed, false);
387 }
388 static int java_return_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
389 static const uint java_return_convention_max_int;
390 static const uint java_return_convention_max_float;
391
392 static void check_member_name_argument_is_last_argument(const methodHandle& method,
393 const BasicType* sig_bt,
394 const VMRegPair* regs) NOT_DEBUG_RETURN;
395
396 // Ditto except for calling C
397 //
398 // C argument in register AND stack slot.
399 // Some architectures require that an argument must be passed in a register
400 // AND in a stack slot. These architectures provide a second VMRegPair array
401 // to be filled by the c_calling_convention method. On other architectures,
402 // NULL is being passed as the second VMRegPair array, so arguments are either
403 // passed in a register OR in a stack slot.
404 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
405 int total_args_passed);
406
407 static size_t trampoline_size();
408
409 static void generate_trampoline(MacroAssembler *masm, address destination);
410
418 // by the time we reach the blob there is compiled code available. This allows
419 // the blob to pass the incoming stack pointer (the sender sp) in a known
420 // location for the interpreter to record. This is used by the frame code
421 // to correct the sender code to match up with the stack pointer when the
422 // thread left the compiled code. In addition it allows the interpreter
423 // to remove the space the c2i adapter allocated to do its argument conversion.
424
425 // Although a c2i blob will always run interpreted even if compiled code is
426 // present if we see that compiled code is present the compiled call site
427 // will be patched/re-resolved so that later calls will run compiled.
428
429 // Additionally a c2i blob need to have a unverified entry because it can be reached
430 // in situations where the call site is an inlined cache site and may go megamorphic.
431
432 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
433 // that the interpreter before it does any call dispatch will record the current
434 // stack pointer in the interpreter frame. On return it will restore the stack
435 // pointer as needed. This means the i2c adapter code doesn't need any special
436 // handshaking path with compiled code to keep the stack walking correct.
437
438 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *masm,
439 int comp_args_on_stack,
440 int comp_args_on_stack_cc,
441 const GrowableArray<SigEntry>* sig,
442 const VMRegPair* regs,
443 const GrowableArray<SigEntry>* sig_cc,
444 const VMRegPair* regs_cc,
445 const GrowableArray<SigEntry>* sig_cc_ro,
446 const VMRegPair* regs_cc_ro,
447 AdapterFingerPrint* fingerprint,
448 AdapterBlob*& new_adapter);
449
450 static void gen_i2c_adapter(MacroAssembler *_masm,
451 int comp_args_on_stack,
452 const GrowableArray<SigEntry>* sig,
453 const VMRegPair *regs);
454
455 // OSR support
456
457 // OSR_migration_begin will extract the jvm state from an interpreter
458 // frame (locals, monitors) and store the data in a piece of C heap
459 // storage. This then allows the interpreter frame to be removed from the
460 // stack and the OSR nmethod to be called. That method is called with a
461 // pointer to the C heap storage. This pointer is the return value from
462 // OSR_migration_begin.
463
464 static intptr_t* OSR_migration_begin(JavaThread *thread);
465
466 // OSR_migration_end is a trivial routine. It is called after the compiled
467 // method has extracted the jvm state from the C heap that OSR_migration_begin
468 // created. It's entire job is to simply free this storage.
469 static void OSR_migration_end(intptr_t* buf);
470
471 // Convert a sig into a calling convention register layout
472 // and find interesting things about it.
508 static void block_for_jni_critical(JavaThread* thread);
509
510 // Pin/Unpin object
511 static oopDesc* pin_object(JavaThread* thread, oopDesc* obj);
512 static void unpin_object(JavaThread* thread, oopDesc* obj);
513
514 // A compiled caller has just called the interpreter, but compiled code
515 // exists. Patch the caller so he no longer calls into the interpreter.
516 static void fixup_callers_callsite(Method* moop, address ret_pc);
517 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
518
519 // Slow-path Locking and Unlocking
520 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
521 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
522
523 // Resolving of calls
524 static address resolve_static_call_C (JavaThread *thread);
525 static address resolve_virtual_call_C (JavaThread *thread);
526 static address resolve_opt_virtual_call_C(JavaThread *thread);
527
528 static void load_value_type_fields_in_regs(JavaThread *thread, oopDesc* res);
529 static void store_value_type_fields_to_buf(JavaThread *thread, intptr_t res);
530
531 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
532 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
533 oopDesc* dest, jint dest_pos,
534 jint length, JavaThread* thread);
535
536 // handle ic miss with caller being compiled code
537 // wrong method handling (inline cache misses, zombie methods)
538 static address handle_wrong_method(JavaThread* thread);
539 static address handle_wrong_method_abstract(JavaThread* thread);
540 static address handle_wrong_method_ic_miss(JavaThread* thread);
541 static void allocate_value_types(JavaThread* thread, Method* callee, bool allocate_receiver);
542 static void apply_post_barriers(JavaThread* thread, objArrayOopDesc* array);
543
544 static address handle_unsafe_access(JavaThread* thread, address next_pc);
545
546 static BufferedValueTypeBlob* generate_buffered_value_type_adapter(const ValueKlass* vk);
547 #ifndef PRODUCT
548
549 // Collect and print inline cache miss statistics
550 private:
551 enum { maxICmiss_count = 100 };
552 static int _ICmiss_index; // length of IC miss histogram
553 static int _ICmiss_count[maxICmiss_count]; // miss counts
554 static address _ICmiss_at[maxICmiss_count]; // miss addresses
555 static void trace_ic_miss(address at);
556
557 public:
558 static int _throw_null_ctr; // throwing a null-pointer exception
559 static int _ic_miss_ctr; // total # of IC misses
560 static int _wrong_method_ctr;
561 static int _resolve_static_ctr;
562 static int _resolve_virtual_ctr;
563 static int _resolve_opt_virtual_ctr;
564 static int _implicit_null_throws;
565 static int _implicit_div0_throws;
566
641 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
642 // setup. Compiled frames are fixed-size and the args are likely not in the
643 // right place. Hence all the args will likely be copied into the
644 // interpreter's frame, forcing that frame to grow. The compiled frame's
645 // outgoing stack args will be dead after the copy.
646 //
647 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
648 // also perform an official frame push & pop. They have a call to the native
649 // routine in their middles and end in a return (instead of ending in a jump).
650 // The native wrappers are stored in real nmethods instead of the BufferBlobs
651 // used by the adapters. The code generation happens here because it's very
652 // similar to what the adapters have to do.
653
654 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
655 friend class AdapterHandlerTable;
656
657 private:
658 AdapterFingerPrint* _fingerprint;
659 address _i2c_entry;
660 address _c2i_entry;
661 address _c2i_value_entry;
662 address _c2i_value_ro_entry;
663 address _c2i_unverified_entry;
664
665 // Support for scalarized value type calling convention
666 const GrowableArray<SigEntry>* _sig_cc;
667
668 #ifdef ASSERT
669 // Captures code and signature used to generate this adapter when
670 // verifying adapter equivalence.
671 unsigned char* _saved_code;
672 int _saved_code_length;
673 #endif
674
675 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_value_entry, address c2i_value_ro_entry, address c2i_unverified_entry) {
676 _fingerprint = fingerprint;
677 _i2c_entry = i2c_entry;
678 _c2i_entry = c2i_entry;
679 _c2i_value_entry = c2i_value_entry;
680 _c2i_value_ro_entry = c2i_value_ro_entry;
681 _c2i_unverified_entry = c2i_unverified_entry;
682 _sig_cc = NULL;
683 #ifdef ASSERT
684 _saved_code = NULL;
685 _saved_code_length = 0;
686 #endif
687 }
688
689 void deallocate();
690
691 // should never be used
692 AdapterHandlerEntry();
693
694 public:
695 address get_i2c_entry() const { return _i2c_entry; }
696 address get_c2i_entry() const { return _c2i_entry; }
697 address get_c2i_value_entry() const { return _c2i_value_entry; }
698 address get_c2i_value_ro_entry() const { return _c2i_value_ro_entry; }
699 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
700 address base_address();
701 void relocate(address new_base);
702
703 // Support for scalarized value type calling convention
704 void set_sig_cc(const GrowableArray<SigEntry>* sig) { _sig_cc = sig; }
705 const GrowableArray<SigEntry>* get_sig_cc() const { return _sig_cc; }
706
707 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
708
709 AdapterHandlerEntry* next() {
710 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
711 }
712
713 #ifdef ASSERT
714 // Used to verify that code generated for shared adapters is equivalent
715 void save_code (unsigned char* code, int length);
716 bool compare_code(unsigned char* code, int length);
717 #endif
718
719 //virtual void print_on(outputStream* st) const; DO NOT USE
720 void print_adapter_on(outputStream* st) const;
721 };
722
723 // This class is used only with DumpSharedSpaces==true. It holds extra information
724 // that's used only during CDS dump time.
725 // For details, see comments around Method::link_method()
726 class CDSAdapterHandlerEntry: public AdapterHandlerEntry {
729
730 public:
731 address get_c2i_entry_trampoline() const { return _c2i_entry_trampoline; }
732 AdapterHandlerEntry** get_adapter_trampoline() const { return _adapter_trampoline; }
733 void init() NOT_CDS_RETURN;
734 };
735
736
737 class AdapterHandlerLibrary: public AllStatic {
738 private:
739 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
740 static AdapterHandlerTable* _adapters;
741 static AdapterHandlerEntry* _abstract_method_handler;
742 static BufferBlob* buffer_blob();
743 static void initialize();
744 static AdapterHandlerEntry* get_adapter0(const methodHandle& method);
745
746 public:
747
748 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
749 address i2c_entry, address c2i_entry, address c2i_value_entry, address c2i_value_ro_entry, address c2i_unverified_entry);
750 static void create_native_wrapper(const methodHandle& method);
751 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
752
753 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
754 static void print_handler_on(outputStream* st, const CodeBlob* b);
755 static bool contains(const CodeBlob* b);
756 #ifndef PRODUCT
757 static void print_statistics();
758 #endif // PRODUCT
759
760 };
761
762 #endif // SHARE_RUNTIME_SHAREDRUNTIME_HPP
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