8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_RUNTIME_SHAREDRUNTIME_HPP
26 #define SHARE_RUNTIME_SHAREDRUNTIME_HPP
27
28 #include "code/codeBlob.hpp"
29 #include "code/vmreg.hpp"
30 #include "interpreter/linkResolver.hpp"
31 #include "memory/allStatic.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "utilities/macros.hpp"
34
35 class AdapterHandlerEntry;
36 class AdapterFingerPrint;
37 class vframeStream;
38
39 // Runtime is the base class for various runtime interfaces
40 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
41 // shared functionality such as exception forwarding (C++ to
42 // Java exceptions), locking/unlocking mechanisms, statistical
43 // information, etc.
44
45 class SharedRuntime: AllStatic {
46 friend class VMStructs;
47
48 private:
49 static bool resolve_sub_helper_internal(methodHandle callee_method, const frame& caller_frame,
50 CompiledMethod* caller_nm, bool is_virtual, bool is_optimized,
51 Handle receiver, CallInfo& call_info, Bytecodes::Code invoke_code, TRAPS);
52 static methodHandle resolve_sub_helper(bool is_virtual, bool is_optimized, TRAPS);
53
54 // Shared stub locations
55
56 static RuntimeStub* _wrong_method_blob;
57 static RuntimeStub* _wrong_method_abstract_blob;
58 static RuntimeStub* _ic_miss_blob;
59 static RuntimeStub* _resolve_opt_virtual_call_blob;
60 static RuntimeStub* _resolve_virtual_call_blob;
61 static RuntimeStub* _resolve_static_call_blob;
62 static address _resolve_static_call_entry;
63
64 static DeoptimizationBlob* _deopt_blob;
65
66 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob;
67 static SafepointBlob* _polling_page_safepoint_handler_blob;
68 static SafepointBlob* _polling_page_return_handler_blob;
69
70 #ifdef COMPILER2
71 static UncommonTrapBlob* _uncommon_trap_blob;
72 #endif // COMPILER2
73
74 static nmethod* _cont_doYield_stub;
75
76 #ifndef PRODUCT
77 // Counters
78 static int64_t _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
79 #endif // !PRODUCT
80
81 private:
82 enum { POLL_AT_RETURN, POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
83 static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
84 static RuntimeStub* generate_resolve_blob(address destination, const char* name);
85
86 public:
87 static void generate_stubs(void);
88
89 // max bytes for each dtrace string parameter
90 enum { max_dtrace_string_size = 256 };
91
92 // The following arithmetic routines are used on platforms that do
93 // not have machine instructions to implement their functionality.
94 // Do not remove these.
95
96 // long arithmetics
97 static jlong lmul(jlong y, jlong x);
98 static jlong ldiv(jlong y, jlong x);
99 static jlong lrem(jlong y, jlong x);
100
101 // float and double remainder
102 static jfloat frem(jfloat x, jfloat y);
103 static jdouble drem(jdouble x, jdouble y);
104
105
308 // in order to correctly free the result.
309 //
310 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
311
312 // Fill in the "X cannot be cast to a Y" message for ClassCastException
313 //
314 // @param caster_klass the class of the object we are casting
315 // @param target_klass the target klass attempt
316 // @return the dynamically allocated exception message (must be freed
317 // by the caller using a resource mark)
318 //
319 // This version does not require access the frame, so it can be called
320 // from interpreted code
321 // The caller (or one of it's callers) must use a ResourceMark
322 // in order to correctly free the result.
323 //
324 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = nullptr);
325
326 // Resolves a call site- may patch in the destination of the call into the
327 // compiled code.
328 static methodHandle resolve_helper(bool is_virtual, bool is_optimized, TRAPS);
329
330 private:
331 // deopt blob
332 static void generate_deopt_blob(void);
333
334 static bool handle_ic_miss_helper_internal(Handle receiver, CompiledMethod* caller_nm, const frame& caller_frame,
335 methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info,
336 bool& needs_ic_stub_refill, TRAPS);
337
338 public:
339 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
340
341 // Resets a call-site in compiled code so it will get resolved again.
342 static methodHandle reresolve_call_site(TRAPS);
343
344 // In the code prolog, if the klass comparison fails, the inline cache
345 // misses and the call site is patched to megamorphic
346 static methodHandle handle_ic_miss_helper(TRAPS);
347
348 // Find the method that called us.
349 static methodHandle find_callee_method(TRAPS);
350
351 static void monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* thread);
352
353 static void monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current);
354
355 private:
356 static Handle find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
357 static Handle find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
358
359 static Method* extract_attached_method(vframeStream& vfst);
360
361 #if defined(X86) && defined(COMPILER1)
362 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
363 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
364 #endif // X86 && COMPILER1
365
366 public:
367
368 // Read the array of BasicTypes from a Java signature, and compute where
369 // compiled Java code would like to put the results. Values in reg_lo and
370 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
371 // registers, those above refer to 4-byte stack slots. All stack slots are
372 // based off of the window top. SharedInfo::stack0 refers to the first usable
373 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
374 // 4-bytes higher.
375 // return value is the maximum number of VMReg stack slots the convention will use.
376 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
377
378 static void check_member_name_argument_is_last_argument(const methodHandle& method,
379 const BasicType* sig_bt,
380 const VMRegPair* regs) NOT_DEBUG_RETURN;
381
382 // Ditto except for calling C
383 //
384 // C argument in register AND stack slot.
385 // Some architectures require that an argument must be passed in a register
386 // AND in a stack slot. These architectures provide a second VMRegPair array
387 // to be filled by the c_calling_convention method. On other architectures,
388 // null is being passed as the second VMRegPair array, so arguments are either
389 // passed in a register OR in a stack slot.
390 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
391
392 static int vector_calling_convention(VMRegPair *regs,
393 uint num_bits,
394 uint total_args_passed);
395
396 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
403 // by the time we reach the blob there is compiled code available. This allows
404 // the blob to pass the incoming stack pointer (the sender sp) in a known
405 // location for the interpreter to record. This is used by the frame code
406 // to correct the sender code to match up with the stack pointer when the
407 // thread left the compiled code. In addition it allows the interpreter
408 // to remove the space the c2i adapter allocated to do its argument conversion.
409
410 // Although a c2i blob will always run interpreted even if compiled code is
411 // present if we see that compiled code is present the compiled call site
412 // will be patched/re-resolved so that later calls will run compiled.
413
414 // Additionally a c2i blob need to have a unverified entry because it can be reached
415 // in situations where the call site is an inlined cache site and may go megamorphic.
416
417 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
418 // that the interpreter before it does any call dispatch will record the current
419 // stack pointer in the interpreter frame. On return it will restore the stack
420 // pointer as needed. This means the i2c adapter code doesn't need any special
421 // handshaking path with compiled code to keep the stack walking correct.
422
423 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
424 int total_args_passed,
425 int max_arg,
426 const BasicType *sig_bt,
427 const VMRegPair *regs,
428 AdapterFingerPrint* fingerprint);
429
430 static void gen_i2c_adapter(MacroAssembler *_masm,
431 int total_args_passed,
432 int comp_args_on_stack,
433 const BasicType *sig_bt,
434 const VMRegPair *regs);
435
436 // OSR support
437
438 // OSR_migration_begin will extract the jvm state from an interpreter
439 // frame (locals, monitors) and store the data in a piece of C heap
440 // storage. This then allows the interpreter frame to be removed from the
441 // stack and the OSR nmethod to be called. That method is called with a
442 // pointer to the C heap storage. This pointer is the return value from
443 // OSR_migration_begin.
444
445 static intptr_t* OSR_migration_begin(JavaThread *thread);
446
447 // OSR_migration_end is a trivial routine. It is called after the compiled
448 // method has extracted the jvm state from the C heap that OSR_migration_begin
449 // created. It's entire job is to simply free this storage.
450 static void OSR_migration_end(intptr_t* buf);
451
452 // Convert a sig into a calling convention register layout
453 // and find interesting things about it.
486 const methodHandle& method,
487 int compile_id,
488 BasicType* sig_bt,
489 VMRegPair* regs,
490 BasicType ret_type);
491
492 // A compiled caller has just called the interpreter, but compiled code
493 // exists. Patch the caller so he no longer calls into the interpreter.
494 static void fixup_callers_callsite(Method* moop, address ret_pc);
495 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
496
497 // Slow-path Locking and Unlocking
498 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
499 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
500
501 // Resolving of calls
502 static address resolve_static_call_C (JavaThread* current);
503 static address resolve_virtual_call_C (JavaThread* current);
504 static address resolve_opt_virtual_call_C(JavaThread* current);
505
506 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
507 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
508 oopDesc* dest, jint dest_pos,
509 jint length, JavaThread* thread);
510
511 // handle ic miss with caller being compiled code
512 // wrong method handling (inline cache misses)
513 static address handle_wrong_method(JavaThread* current);
514 static address handle_wrong_method_abstract(JavaThread* current);
515 static address handle_wrong_method_ic_miss(JavaThread* current);
516
517 static address handle_unsafe_access(JavaThread* thread, address next_pc);
518
519 #ifndef PRODUCT
520
521 // Collect and print inline cache miss statistics
522 private:
523 enum { maxICmiss_count = 100 };
524 static int _ICmiss_index; // length of IC miss histogram
525 static int _ICmiss_count[maxICmiss_count]; // miss counts
526 static address _ICmiss_at[maxICmiss_count]; // miss addresses
527 static void trace_ic_miss(address at);
528
529 public:
530 static uint _ic_miss_ctr; // total # of IC misses
531 static uint _wrong_method_ctr;
532 static uint _resolve_static_ctr;
533 static uint _resolve_virtual_ctr;
534 static uint _resolve_opt_virtual_ctr;
535 static uint _implicit_null_throws;
536 static uint _implicit_div0_throws;
537
538 static uint _jbyte_array_copy_ctr; // Slow-path byte array copy
605 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
606 // setup. Compiled frames are fixed-size and the args are likely not in the
607 // right place. Hence all the args will likely be copied into the
608 // interpreter's frame, forcing that frame to grow. The compiled frame's
609 // outgoing stack args will be dead after the copy.
610 //
611 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
612 // also perform an official frame push & pop. They have a call to the native
613 // routine in their middles and end in a return (instead of ending in a jump).
614 // The native wrappers are stored in real nmethods instead of the BufferBlobs
615 // used by the adapters. The code generation happens here because it's very
616 // similar to what the adapters have to do.
617
618 class AdapterHandlerEntry : public CHeapObj<mtCode> {
619 friend class AdapterHandlerLibrary;
620
621 private:
622 AdapterFingerPrint* _fingerprint;
623 address _i2c_entry;
624 address _c2i_entry;
625 address _c2i_unverified_entry;
626 address _c2i_no_clinit_check_entry;
627
628 #ifdef ASSERT
629 // Captures code and signature used to generate this adapter when
630 // verifying adapter equivalence.
631 unsigned char* _saved_code;
632 int _saved_code_length;
633 #endif
634
635 AdapterHandlerEntry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry,
636 address c2i_unverified_entry,
637 address c2i_no_clinit_check_entry) :
638 _fingerprint(fingerprint),
639 _i2c_entry(i2c_entry),
640 _c2i_entry(c2i_entry),
641 _c2i_unverified_entry(c2i_unverified_entry),
642 _c2i_no_clinit_check_entry(c2i_no_clinit_check_entry)
643 #ifdef ASSERT
644 , _saved_code_length(0)
645 #endif
646 { }
647
648 ~AdapterHandlerEntry();
649
650 public:
651 address get_i2c_entry() const { return _i2c_entry; }
652 address get_c2i_entry() const { return _c2i_entry; }
653 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
654 address get_c2i_no_clinit_check_entry() const { return _c2i_no_clinit_check_entry; }
655
656 address base_address();
657 void relocate(address new_base);
658
659 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
660
661 #ifdef ASSERT
662 // Used to verify that code generated for shared adapters is equivalent
663 void save_code (unsigned char* code, int length);
664 bool compare_code(AdapterHandlerEntry* other);
665 #endif
666
667 //virtual void print_on(outputStream* st) const; DO NOT USE
668 void print_adapter_on(outputStream* st) const;
669 };
670
671 class AdapterHandlerLibrary: public AllStatic {
672 friend class SharedRuntime;
673 private:
674 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
675 static AdapterHandlerEntry* _abstract_method_handler;
676 static AdapterHandlerEntry* _no_arg_handler;
677 static AdapterHandlerEntry* _int_arg_handler;
678 static AdapterHandlerEntry* _obj_arg_handler;
679 static AdapterHandlerEntry* _obj_int_arg_handler;
680 static AdapterHandlerEntry* _obj_obj_arg_handler;
681
682 static BufferBlob* buffer_blob();
683 static void initialize();
684 static AdapterHandlerEntry* create_adapter(AdapterBlob*& new_adapter,
685 int total_args_passed,
686 BasicType* sig_bt,
687 bool allocate_code_blob);
688 static AdapterHandlerEntry* get_simple_adapter(const methodHandle& method);
689 public:
690
691 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
692 address i2c_entry,
693 address c2i_entry,
694 address c2i_unverified_entry,
695 address c2i_no_clinit_check_entry = nullptr);
696 static void create_native_wrapper(const methodHandle& method);
697 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
698
699 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
700 static void print_handler_on(outputStream* st, const CodeBlob* b);
701 static bool contains(const CodeBlob* b);
702 #ifndef PRODUCT
703 static void print_statistics();
704 #endif // PRODUCT
705
706 };
707
708 #endif // SHARE_RUNTIME_SHAREDRUNTIME_HPP
|
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_RUNTIME_SHAREDRUNTIME_HPP
26 #define SHARE_RUNTIME_SHAREDRUNTIME_HPP
27
28 #include "asm/codeBuffer.hpp"
29 #include "code/codeBlob.hpp"
30 #include "code/vmreg.hpp"
31 #include "interpreter/linkResolver.hpp"
32 #include "memory/allStatic.hpp"
33 #include "memory/resourceArea.hpp"
34 #include "runtime/signature.hpp"
35 #include "utilities/macros.hpp"
36
37 class AdapterHandlerEntry;
38 class AdapterFingerPrint;
39 class vframeStream;
40 class SigEntry;
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 class SharedRuntime: AllStatic {
49 friend class VMStructs;
50
51 private:
52 static bool resolve_sub_helper_internal(methodHandle callee_method, const frame& caller_frame,
53 CompiledMethod* caller_nm, bool is_virtual, bool is_optimized, bool& caller_is_c1,
54 Handle receiver, CallInfo& call_info, Bytecodes::Code invoke_code, TRAPS);
55 static methodHandle resolve_sub_helper(bool is_virtual, bool is_optimized, bool& caller_is_c1, TRAPS);
56
57 // Shared stub locations
58
59 static RuntimeStub* _wrong_method_blob;
60 static RuntimeStub* _wrong_method_abstract_blob;
61 static RuntimeStub* _ic_miss_blob;
62 static RuntimeStub* _resolve_opt_virtual_call_blob;
63 static RuntimeStub* _resolve_virtual_call_blob;
64 static RuntimeStub* _resolve_static_call_blob;
65
66 static DeoptimizationBlob* _deopt_blob;
67
68 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob;
69 static SafepointBlob* _polling_page_safepoint_handler_blob;
70 static SafepointBlob* _polling_page_return_handler_blob;
71
72 #ifdef COMPILER2
73 static UncommonTrapBlob* _uncommon_trap_blob;
74 #endif // COMPILER2
75
76 static nmethod* _cont_doYield_stub;
77
78 #ifndef PRODUCT
79 // Counters
80 static int64_t _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 public:
88 static void generate_stubs(void);
89
90 // max bytes for each dtrace string parameter
91 enum { max_dtrace_string_size = 256 };
92
93 // The following arithmetic routines are used on platforms that do
94 // not have machine instructions to implement their functionality.
95 // Do not remove these.
96
97 // long arithmetics
98 static jlong lmul(jlong y, jlong x);
99 static jlong ldiv(jlong y, jlong x);
100 static jlong lrem(jlong y, jlong x);
101
102 // float and double remainder
103 static jfloat frem(jfloat x, jfloat y);
104 static jdouble drem(jdouble x, jdouble y);
105
106
309 // in order to correctly free the result.
310 //
311 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
312
313 // Fill in the "X cannot be cast to a Y" message for ClassCastException
314 //
315 // @param caster_klass the class of the object we are casting
316 // @param target_klass the target klass attempt
317 // @return the dynamically allocated exception message (must be freed
318 // by the caller using a resource mark)
319 //
320 // This version does not require access the frame, so it can be called
321 // from interpreted code
322 // The caller (or one of it's callers) must use a ResourceMark
323 // in order to correctly free the result.
324 //
325 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = nullptr);
326
327 // Resolves a call site- may patch in the destination of the call into the
328 // compiled code.
329 static methodHandle resolve_helper(bool is_virtual, bool is_optimized, bool& caller_is_c1, TRAPS);
330
331 private:
332 // deopt blob
333 static void generate_deopt_blob(void);
334
335 static bool handle_ic_miss_helper_internal(Handle receiver, CompiledMethod* caller_nm, const frame& caller_frame,
336 methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info,
337 bool& needs_ic_stub_refill, bool& is_optimized, bool caller_is_c1, TRAPS);
338
339 public:
340 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
341
342 // Resets a call-site in compiled code so it will get resolved again.
343 static methodHandle reresolve_call_site(bool& is_static_call, bool& is_optimized, bool& caller_is_c1, TRAPS);
344
345 // In the code prolog, if the klass comparison fails, the inline cache
346 // misses and the call site is patched to megamorphic
347 static methodHandle handle_ic_miss_helper(bool& is_optimized, bool& caller_is_c1, TRAPS);
348
349 // Find the method that called us.
350 static methodHandle find_callee_method(bool is_optimized, bool& caller_is_c1, TRAPS);
351
352 static void monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* thread);
353
354 static void monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current);
355
356 static address entry_for_handle_wrong_method(methodHandle callee_method, bool is_static_call, bool is_optimized, bool caller_is_c1) {
357 assert(callee_method->verified_code_entry() != nullptr, "Jump to zero!");
358 assert(callee_method->verified_inline_code_entry() != nullptr, "Jump to zero!");
359 assert(callee_method->verified_inline_ro_code_entry() != nullptr, "Jump to zero!");
360 if (caller_is_c1) {
361 return callee_method->verified_inline_code_entry();
362 } else if (is_static_call || is_optimized) {
363 return callee_method->verified_code_entry();
364 } else {
365 return callee_method->verified_inline_ro_code_entry();
366 }
367 }
368
369 private:
370 static Handle find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
371 static Handle find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
372
373 static Method* extract_attached_method(vframeStream& vfst);
374
375 #if defined(X86) && defined(COMPILER1)
376 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
377 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
378 #endif // X86 && COMPILER1
379
380 public:
381
382 // Read the array of BasicTypes from a Java signature, and compute where
383 // compiled Java code would like to put the results. Values in reg_lo and
384 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
385 // registers, those above refer to 4-byte stack slots. All stack slots are
386 // based off of the window top. SharedInfo::stack0 refers to the first usable
387 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
388 // 4-bytes higher.
389 // return value is the maximum number of VMReg stack slots the convention will use.
390 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
391 static int java_calling_convention(const GrowableArray<SigEntry>* sig, VMRegPair* regs) {
392 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sig->length());
393 int total_args_passed = SigEntry::fill_sig_bt(sig, sig_bt);
394 return java_calling_convention(sig_bt, regs, total_args_passed);
395 }
396 static int java_return_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
397 static const uint java_return_convention_max_int;
398 static const uint java_return_convention_max_float;
399
400 static void check_member_name_argument_is_last_argument(const methodHandle& method,
401 const BasicType* sig_bt,
402 const VMRegPair* regs) NOT_DEBUG_RETURN;
403
404 // Ditto except for calling C
405 //
406 // C argument in register AND stack slot.
407 // Some architectures require that an argument must be passed in a register
408 // AND in a stack slot. These architectures provide a second VMRegPair array
409 // to be filled by the c_calling_convention method. On other architectures,
410 // null is being passed as the second VMRegPair array, so arguments are either
411 // passed in a register OR in a stack slot.
412 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
413
414 static int vector_calling_convention(VMRegPair *regs,
415 uint num_bits,
416 uint total_args_passed);
417
418 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
425 // by the time we reach the blob there is compiled code available. This allows
426 // the blob to pass the incoming stack pointer (the sender sp) in a known
427 // location for the interpreter to record. This is used by the frame code
428 // to correct the sender code to match up with the stack pointer when the
429 // thread left the compiled code. In addition it allows the interpreter
430 // to remove the space the c2i adapter allocated to do its argument conversion.
431
432 // Although a c2i blob will always run interpreted even if compiled code is
433 // present if we see that compiled code is present the compiled call site
434 // will be patched/re-resolved so that later calls will run compiled.
435
436 // Additionally a c2i blob need to have a unverified entry because it can be reached
437 // in situations where the call site is an inlined cache site and may go megamorphic.
438
439 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
440 // that the interpreter before it does any call dispatch will record the current
441 // stack pointer in the interpreter frame. On return it will restore the stack
442 // pointer as needed. This means the i2c adapter code doesn't need any special
443 // handshaking path with compiled code to keep the stack walking correct.
444
445 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *masm,
446 int comp_args_on_stack,
447 const GrowableArray<SigEntry>* sig,
448 const VMRegPair* regs,
449 const GrowableArray<SigEntry>* sig_cc,
450 const VMRegPair* regs_cc,
451 const GrowableArray<SigEntry>* sig_cc_ro,
452 const VMRegPair* regs_cc_ro,
453 AdapterFingerPrint* fingerprint,
454 AdapterBlob*& new_adapter,
455 bool allocate_code_blob);
456
457 static void gen_i2c_adapter(MacroAssembler *_masm,
458 int comp_args_on_stack,
459 const GrowableArray<SigEntry>* sig,
460 const VMRegPair *regs);
461
462 // OSR support
463
464 // OSR_migration_begin will extract the jvm state from an interpreter
465 // frame (locals, monitors) and store the data in a piece of C heap
466 // storage. This then allows the interpreter frame to be removed from the
467 // stack and the OSR nmethod to be called. That method is called with a
468 // pointer to the C heap storage. This pointer is the return value from
469 // OSR_migration_begin.
470
471 static intptr_t* OSR_migration_begin(JavaThread *thread);
472
473 // OSR_migration_end is a trivial routine. It is called after the compiled
474 // method has extracted the jvm state from the C heap that OSR_migration_begin
475 // created. It's entire job is to simply free this storage.
476 static void OSR_migration_end(intptr_t* buf);
477
478 // Convert a sig into a calling convention register layout
479 // and find interesting things about it.
512 const methodHandle& method,
513 int compile_id,
514 BasicType* sig_bt,
515 VMRegPair* regs,
516 BasicType ret_type);
517
518 // A compiled caller has just called the interpreter, but compiled code
519 // exists. Patch the caller so he no longer calls into the interpreter.
520 static void fixup_callers_callsite(Method* moop, address ret_pc);
521 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
522
523 // Slow-path Locking and Unlocking
524 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
525 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
526
527 // Resolving of calls
528 static address resolve_static_call_C (JavaThread* current);
529 static address resolve_virtual_call_C (JavaThread* current);
530 static address resolve_opt_virtual_call_C(JavaThread* current);
531
532 static void load_inline_type_fields_in_regs(JavaThread* current, oopDesc* res);
533 static void store_inline_type_fields_to_buf(JavaThread* current, intptr_t res);
534
535 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
536 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
537 oopDesc* dest, jint dest_pos,
538 jint length, JavaThread* thread);
539
540 // handle ic miss with caller being compiled code
541 // wrong method handling (inline cache misses)
542 static address handle_wrong_method(JavaThread* current);
543 static address handle_wrong_method_abstract(JavaThread* current);
544 static address handle_wrong_method_ic_miss(JavaThread* current);
545 static void allocate_inline_types(JavaThread* current, Method* callee, bool allocate_receiver);
546 static oop allocate_inline_types_impl(JavaThread* current, methodHandle callee, bool allocate_receiver, TRAPS);
547
548 static address handle_unsafe_access(JavaThread* thread, address next_pc);
549
550 static BufferedInlineTypeBlob* generate_buffered_inline_type_adapter(const InlineKlass* vk);
551 #ifndef PRODUCT
552
553 // Collect and print inline cache miss statistics
554 private:
555 enum { maxICmiss_count = 100 };
556 static int _ICmiss_index; // length of IC miss histogram
557 static int _ICmiss_count[maxICmiss_count]; // miss counts
558 static address _ICmiss_at[maxICmiss_count]; // miss addresses
559 static void trace_ic_miss(address at);
560
561 public:
562 static uint _ic_miss_ctr; // total # of IC misses
563 static uint _wrong_method_ctr;
564 static uint _resolve_static_ctr;
565 static uint _resolve_virtual_ctr;
566 static uint _resolve_opt_virtual_ctr;
567 static uint _implicit_null_throws;
568 static uint _implicit_div0_throws;
569
570 static uint _jbyte_array_copy_ctr; // Slow-path byte array copy
637 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
638 // setup. Compiled frames are fixed-size and the args are likely not in the
639 // right place. Hence all the args will likely be copied into the
640 // interpreter's frame, forcing that frame to grow. The compiled frame's
641 // outgoing stack args will be dead after the copy.
642 //
643 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
644 // also perform an official frame push & pop. They have a call to the native
645 // routine in their middles and end in a return (instead of ending in a jump).
646 // The native wrappers are stored in real nmethods instead of the BufferBlobs
647 // used by the adapters. The code generation happens here because it's very
648 // similar to what the adapters have to do.
649
650 class AdapterHandlerEntry : public CHeapObj<mtCode> {
651 friend class AdapterHandlerLibrary;
652
653 private:
654 AdapterFingerPrint* _fingerprint;
655 address _i2c_entry;
656 address _c2i_entry;
657 address _c2i_inline_entry;
658 address _c2i_inline_ro_entry;
659 address _c2i_unverified_entry;
660 address _c2i_unverified_inline_entry;
661 address _c2i_no_clinit_check_entry;
662
663 // Support for scalarized inline type calling convention
664 const GrowableArray<SigEntry>* _sig_cc;
665
666 #ifdef ASSERT
667 // Captures code and signature used to generate this adapter when
668 // verifying adapter equivalence.
669 unsigned char* _saved_code;
670 int _saved_code_length;
671 #endif
672
673 AdapterHandlerEntry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry,
674 address c2i_inline_entry, address c2i_inline_ro_entry,
675 address c2i_unverified_entry, address c2i_unverified_inline_entry,
676 address c2i_no_clinit_check_entry) :
677 _fingerprint(fingerprint),
678 _i2c_entry(i2c_entry),
679 _c2i_entry(c2i_entry),
680 _c2i_inline_entry(c2i_inline_entry),
681 _c2i_inline_ro_entry(c2i_inline_ro_entry),
682 _c2i_unverified_entry(c2i_unverified_entry),
683 _c2i_unverified_inline_entry(c2i_unverified_inline_entry),
684 _c2i_no_clinit_check_entry(c2i_no_clinit_check_entry),
685 _sig_cc(nullptr)
686 #ifdef ASSERT
687 , _saved_code_length(0)
688 #endif
689 { }
690
691 ~AdapterHandlerEntry();
692
693 public:
694 address get_i2c_entry() const { return _i2c_entry; }
695 address get_c2i_entry() const { return _c2i_entry; }
696 address get_c2i_inline_entry() const { return _c2i_inline_entry; }
697 address get_c2i_inline_ro_entry() const { return _c2i_inline_ro_entry; }
698 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
699 address get_c2i_unverified_inline_entry() const { return _c2i_unverified_inline_entry; }
700 address get_c2i_no_clinit_check_entry() const { return _c2i_no_clinit_check_entry; }
701
702 address base_address();
703 void relocate(address new_base);
704
705 // Support for scalarized inline type calling convention
706 void set_sig_cc(const GrowableArray<SigEntry>* sig) { _sig_cc = sig; }
707 const GrowableArray<SigEntry>* get_sig_cc() const { return _sig_cc; }
708
709 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
710
711 #ifdef ASSERT
712 // Used to verify that code generated for shared adapters is equivalent
713 void save_code (unsigned char* code, int length);
714 bool compare_code(AdapterHandlerEntry* other);
715 #endif
716
717 //virtual void print_on(outputStream* st) const; DO NOT USE
718 void print_adapter_on(outputStream* st) const;
719 };
720
721 class CompiledEntrySignature;
722
723 class AdapterHandlerLibrary: public AllStatic {
724 friend class SharedRuntime;
725 private:
726 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
727 static AdapterHandlerEntry* _abstract_method_handler;
728 static AdapterHandlerEntry* _no_arg_handler;
729 static AdapterHandlerEntry* _int_arg_handler;
730 static AdapterHandlerEntry* _obj_arg_handler;
731 static AdapterHandlerEntry* _obj_int_arg_handler;
732 static AdapterHandlerEntry* _obj_obj_arg_handler;
733
734 static BufferBlob* buffer_blob();
735 static void initialize();
736 static AdapterHandlerEntry* create_adapter(AdapterBlob*& new_adapter,
737 CompiledEntrySignature& ces,
738 bool allocate_code_blob);
739 static AdapterHandlerEntry* get_simple_adapter(const methodHandle& method);
740 public:
741
742 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
743 address i2c_entry, address c2i_entry, address c2i_inline_entry, address c2i_inline_ro_entry,
744 address c2i_unverified_entry, address c2i_unverified_inline_entry, address c2i_no_clinit_check_entry = nullptr);
745 static void create_native_wrapper(const methodHandle& method);
746 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
747
748 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
749 static void print_handler_on(outputStream* st, const CodeBlob* b);
750 static bool contains(const CodeBlob* b);
751 #ifndef PRODUCT
752 static void print_statistics();
753 #endif // PRODUCT
754
755 };
756
757 // Utility class for computing the calling convention of the 3 types
758 // of compiled method entries:
759 // Method::_from_compiled_entry - sig_cc
760 // Method::_from_compiled_inline_ro_entry - sig_cc_ro
761 // Method::_from_compiled_inline_entry - sig
762 class CompiledEntrySignature : public StackObj {
763 Method* _method;
764 int _num_inline_args;
765 bool _has_inline_recv;
766 GrowableArray<SigEntry>* _sig;
767 GrowableArray<SigEntry>* _sig_cc;
768 GrowableArray<SigEntry>* _sig_cc_ro;
769 VMRegPair* _regs;
770 VMRegPair* _regs_cc;
771 VMRegPair* _regs_cc_ro;
772
773 int _args_on_stack;
774 int _args_on_stack_cc;
775 int _args_on_stack_cc_ro;
776
777 bool _c1_needs_stack_repair;
778 bool _c2_needs_stack_repair;
779
780 GrowableArray<Method*>* _supers;
781
782 public:
783 Method* method() const { return _method; }
784
785 // Used by Method::_from_compiled_inline_entry
786 GrowableArray<SigEntry>* sig() const { return _sig; }
787
788 // Used by Method::_from_compiled_entry
789 GrowableArray<SigEntry>* sig_cc() const { return _sig_cc; }
790
791 // Used by Method::_from_compiled_inline_ro_entry
792 GrowableArray<SigEntry>* sig_cc_ro() const { return _sig_cc_ro; }
793
794 VMRegPair* regs() const { return _regs; }
795 VMRegPair* regs_cc() const { return _regs_cc; }
796 VMRegPair* regs_cc_ro() const { return _regs_cc_ro; }
797
798 int args_on_stack() const { return _args_on_stack; }
799 int args_on_stack_cc() const { return _args_on_stack_cc; }
800 int args_on_stack_cc_ro() const { return _args_on_stack_cc_ro; }
801
802 int num_inline_args() const { return _num_inline_args; }
803 bool has_inline_recv() const { return _has_inline_recv; }
804
805 bool has_scalarized_args() const { return _sig != _sig_cc; }
806 bool c1_needs_stack_repair() const { return _c1_needs_stack_repair; }
807 bool c2_needs_stack_repair() const { return _c2_needs_stack_repair; }
808 CodeOffsets::Entries c1_inline_ro_entry_type() const;
809
810 GrowableArray<Method*>* get_supers();
811
812 CompiledEntrySignature(Method* method = nullptr);
813 void compute_calling_conventions(bool init = true);
814 };
815
816 #endif // SHARE_RUNTIME_SHAREDRUNTIME_HPP
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