1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
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/stubInfo.hpp"
36 #include "utilities/macros.hpp"
37
38 class AdapterHandlerEntry;
39 class AdapterFingerPrint;
40 class vframeStream;
41
42 // Runtime is the base class for various runtime interfaces
43 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
44 // shared functionality such as exception forwarding (C++ to
45 // Java exceptions), locking/unlocking mechanisms, statistical
46 // information, etc.
47
48 class SharedRuntime: AllStatic {
49 private:
50 // Declare shared stub fields
51 #define SHARED_STUB_FIELD_DECLARE(name, type) \
52 static type* BLOB_FIELD_NAME(name);
53 SHARED_STUBS_DO(SHARED_STUB_FIELD_DECLARE)
54 #undef SHARED_STUB_FIELD_DECLARE
55
56 #ifdef ASSERT
57 static bool is_resolve_id(StubId id) {
58 return (id == StubId::shared_wrong_method_id ||
59 id == StubId::shared_wrong_method_abstract_id ||
60 id == StubId::shared_ic_miss_id ||
61 id == StubId::shared_resolve_opt_virtual_call_id ||
62 id == StubId::shared_resolve_virtual_call_id ||
63 id == StubId::shared_resolve_static_call_id);
64 }
65 static bool is_polling_page_id(StubId id) {
66 return (id == StubId::shared_polling_page_vectors_safepoint_handler_id ||
67 id == StubId::shared_polling_page_safepoint_handler_id ||
68 id == StubId::shared_polling_page_return_handler_id);
69 }
70 static bool is_throw_id(StubId id) {
71 return (id == StubId::shared_throw_AbstractMethodError_id ||
72 id == StubId::shared_throw_IncompatibleClassChangeError_id ||
73 id == StubId::shared_throw_NullPointerException_at_call_id ||
74 id == StubId::shared_throw_StackOverflowError_id ||
75 id == StubId::shared_throw_delayed_StackOverflowError_id);
76 }
77 #endif
78
79 #ifndef PRODUCT
80 // Counters
81 static int64_t _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
82 #endif // !PRODUCT
83
84 private:
85 static SafepointBlob* generate_handler_blob(StubId id, address call_ptr);
86 static RuntimeStub* generate_resolve_blob(StubId id, address destination);
87 static RuntimeStub* generate_throw_exception(StubId id, address runtime_entry);
88 public:
89 static void generate_initial_stubs(void);
90 static void generate_stubs(void);
91 #if INCLUDE_JFR
92 static void generate_jfr_stubs(void);
93 // For c2: c_rarg0 is junk, call to runtime to write a checkpoint.
94 // It returns a jobject handle to the event writer.
95 // The handle is dereferenced and the return value is the event writer oop.
96 static RuntimeStub* generate_jfr_write_checkpoint();
97 // For c2: call to runtime to return a buffer lease.
98 static RuntimeStub* generate_jfr_return_lease();
99 #endif
100 static void init_adapter_library();
101
102 static const char *stub_name(StubId id) {
103 assert(StubInfo::is_shared(id), "not a shared stub %s", StubInfo::name(id));
104 return StubInfo::name(id);
105 }
106
107 // max bytes for each dtrace string parameter
108 enum { max_dtrace_string_size = 256 };
109
110 // The following arithmetic routines are used on platforms that do
111 // not have machine instructions to implement their functionality.
112 // Do not remove these.
113
114 // long arithmetics
115 static jlong lmul(jlong y, jlong x);
116 static jlong ldiv(jlong y, jlong x);
117 static jlong lrem(jlong y, jlong x);
118
119 // float and double remainder
120 static jfloat frem(jfloat x, jfloat y);
121 static jdouble drem(jdouble x, jdouble y);
122
123
124 #ifdef _WIN64
125 // Workaround for fmod issue in the Windows x64 CRT
126 static double fmod_winx64(double x, double y);
127 #endif
128
129 #ifdef __SOFTFP__
130 static jfloat fadd(jfloat x, jfloat y);
131 static jfloat fsub(jfloat x, jfloat y);
132 static jfloat fmul(jfloat x, jfloat y);
133 static jfloat fdiv(jfloat x, jfloat y);
134
135 static jdouble dadd(jdouble x, jdouble y);
136 static jdouble dsub(jdouble x, jdouble y);
137 static jdouble dmul(jdouble x, jdouble y);
138 static jdouble ddiv(jdouble x, jdouble y);
139 #endif // __SOFTFP__
140
141 // float conversion (needs to set appropriate rounding mode)
142 static jint f2i (jfloat x);
143 static jlong f2l (jfloat x);
144 static jint d2i (jdouble x);
145 static jlong d2l (jdouble x);
146 static jfloat d2f (jdouble x);
147 static jfloat l2f (jlong x);
148 static jdouble l2d (jlong x);
149 static jfloat i2f (jint x);
150
151 #ifdef __SOFTFP__
152 static jdouble i2d (jint x);
153 static jdouble f2d (jfloat x);
154 #endif // __SOFTFP__
155
156 // double trigonometrics and transcendentals
157 static jdouble dsin(jdouble x);
158 static jdouble dcos(jdouble x);
159 static jdouble dtan(jdouble x);
160 static jdouble dlog(jdouble x);
161 static jdouble dlog10(jdouble x);
162 static jdouble dexp(jdouble x);
163 static jdouble dpow(jdouble x, jdouble y);
164
165 #if defined(__SOFTFP__) || defined(E500V2)
166 static double dabs(double f);
167 #endif
168
169 #if defined(__SOFTFP__)
170 static double dsqrt(double f);
171 #endif
172
173 // Montgomery multiplication
174 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
175 jint len, jlong inv, jint *m_ints);
176 static void montgomery_square(jint *a_ints, jint *n_ints,
177 jint len, jlong inv, jint *m_ints);
178
179 #ifdef __SOFTFP__
180 // C++ compiler generates soft float instructions as well as passing
181 // float and double in registers.
182 static int fcmpl(float x, float y);
183 static int fcmpg(float x, float y);
184 static int dcmpl(double x, double y);
185 static int dcmpg(double x, double y);
186
187 static int unordered_fcmplt(float x, float y);
188 static int unordered_dcmplt(double x, double y);
189 static int unordered_fcmple(float x, float y);
190 static int unordered_dcmple(double x, double y);
191 static int unordered_fcmpge(float x, float y);
192 static int unordered_dcmpge(double x, double y);
193 static int unordered_fcmpgt(float x, float y);
194 static int unordered_dcmpgt(double x, double y);
195
196 static float fneg(float f);
197 static double dneg(double f);
198 #endif
199
200 // exception handling across interpreter/compiler boundaries
201 static address raw_exception_handler_for_return_address(JavaThread* current, address return_address);
202 static address exception_handler_for_return_address(JavaThread* current, address return_address);
203
204 // exception handling and implicit exceptions
205 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
206 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred);
207 enum ImplicitExceptionKind {
208 IMPLICIT_NULL,
209 IMPLICIT_DIVIDE_BY_ZERO,
210 STACK_OVERFLOW
211 };
212 static void throw_AbstractMethodError(JavaThread* current);
213 static void throw_IncompatibleClassChangeError(JavaThread* current);
214 static void throw_ArithmeticException(JavaThread* current);
215 static void throw_NullPointerException(JavaThread* current);
216 static void throw_NullPointerException_at_call(JavaThread* current);
217 static void throw_StackOverflowError(JavaThread* current);
218 static void throw_delayed_StackOverflowError(JavaThread* current);
219 static void throw_StackOverflowError_common(JavaThread* current, bool delayed);
220 static address continuation_for_implicit_exception(JavaThread* current,
221 address faulting_pc,
222 ImplicitExceptionKind exception_kind);
223
224 // Post-slow-path-allocation, pre-initializing-stores step for
225 // implementing e.g. ReduceInitialCardMarks
226 static void on_slowpath_allocation_exit(JavaThread* current);
227
228 static void enable_stack_reserved_zone(JavaThread* current);
229 static frame look_for_reserved_stack_annotated_method(JavaThread* current, frame fr);
230
231 // Shared stub locations
232 static address get_poll_stub(address pc);
233
234 static address get_ic_miss_stub() {
235 assert(_ic_miss_blob!= nullptr, "oops");
236 return _ic_miss_blob->entry_point();
237 }
238
239 static address get_handle_wrong_method_stub() {
240 assert(_wrong_method_blob!= nullptr, "oops");
241 return _wrong_method_blob->entry_point();
242 }
243
244 static address get_handle_wrong_method_abstract_stub() {
245 assert(_wrong_method_abstract_blob!= nullptr, "oops");
246 return _wrong_method_abstract_blob->entry_point();
247 }
248
249 static address get_resolve_opt_virtual_call_stub() {
250 assert(_resolve_opt_virtual_call_blob != nullptr, "oops");
251 return _resolve_opt_virtual_call_blob->entry_point();
252 }
253 static address get_resolve_virtual_call_stub() {
254 assert(_resolve_virtual_call_blob != nullptr, "oops");
255 return _resolve_virtual_call_blob->entry_point();
256 }
257 static address get_resolve_static_call_stub() {
258 assert(_resolve_static_call_blob != nullptr, "oops");
259 return _resolve_static_call_blob->entry_point();
260 }
261
262 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
263 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
264 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; }
265
266 // Implicit exceptions
267 static address throw_AbstractMethodError_entry() {
268 assert(_throw_AbstractMethodError_blob != nullptr, "");
269 return _throw_AbstractMethodError_blob->entry_point();
270 }
271 static address throw_IncompatibleClassChangeError_entry() {
272 assert(_throw_IncompatibleClassChangeError_blob != nullptr, "");
273 return _throw_IncompatibleClassChangeError_blob->entry_point();
274 }
275 static address throw_NullPointerException_at_call_entry() {
276 assert(_throw_NullPointerException_at_call_blob != nullptr, "");
277 return _throw_NullPointerException_at_call_blob->entry_point();
278 }
279 static address throw_StackOverflowError_entry() {
280 assert(_throw_StackOverflowError_blob != nullptr, "");
281 return _throw_StackOverflowError_blob->entry_point();
282 }
283 static address throw_delayed_StackOverflowError_entry() {
284 assert(_throw_delayed_StackOverflowError_blob != nullptr, "");
285 return _throw_delayed_StackOverflowError_blob->entry_point();
286 }
287
288 #if INCLUDE_JFR
289 static address jfr_write_checkpoint() {
290 assert(_jfr_write_checkpoint_blob != nullptr, "");
291 return _jfr_write_checkpoint_blob->entry_point();
292 }
293 static address jfr_return_lease() {
294 assert(_jfr_return_lease_blob != nullptr, "");
295 return _jfr_return_lease_blob->entry_point();
296 }
297 #endif
298
299 // Counters
300 #ifndef PRODUCT
301 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
302 #endif // PRODUCT
303
304 // Helper routine for full-speed JVMTI exception throwing support
305 static void throw_and_post_jvmti_exception(JavaThread* current, Handle h_exception);
306 static void throw_and_post_jvmti_exception(JavaThread* current, Symbol* name, const char *message = nullptr);
307
308 #if INCLUDE_JVMTI
309 // Functions for JVMTI notifications
310 static void notify_jvmti_vthread_start(oopDesc* vt, jboolean hide, JavaThread* current);
311 static void notify_jvmti_vthread_end(oopDesc* vt, jboolean hide, JavaThread* current);
312 static void notify_jvmti_vthread_mount(oopDesc* vt, jboolean hide, JavaThread* current);
313 static void notify_jvmti_vthread_unmount(oopDesc* vt, jboolean hide, JavaThread* current);
314 #endif
315
316 // RedefineClasses() tracing support for obsolete method entry
317 static int rc_trace_method_entry(JavaThread* thread, Method* m);
318
319 // To be used as the entry point for unresolved native methods.
320 static address native_method_throw_unsatisfied_link_error_entry();
321
322 static void register_finalizer(JavaThread* thread, oopDesc* obj);
323
324 // dtrace notifications
325 static int dtrace_object_alloc(oopDesc* o);
326 static int dtrace_object_alloc(JavaThread* thread, oopDesc* o);
327 static int dtrace_object_alloc(JavaThread* thread, oopDesc* o, size_t size);
328 static int dtrace_method_entry(JavaThread* thread, Method* m);
329 static int dtrace_method_exit(JavaThread* thread, Method* m);
330
331 // Utility method for retrieving the Java thread id, returns 0 if the
332 // thread is not a well formed Java thread.
333 static jlong get_java_tid(JavaThread* thread);
334
335
336 // used by native wrappers to re-enable yellow if overflow happened in native code
337 static void reguard_yellow_pages();
338
339 // Fill in the "X cannot be cast to a Y" message for ClassCastException
340 //
341 // @param thr the current thread
342 // @param caster_klass the class of the object we are casting
343 // @return the dynamically allocated exception message (must be freed
344 // by the caller using a resource mark)
345 //
346 // BCP must refer to the current 'checkcast' opcode for the frame
347 // on top of the stack.
348 // The caller (or one of its callers) must use a ResourceMark
349 // in order to correctly free the result.
350 //
351 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
352
353 // Fill in the "X cannot be cast to a Y" message for ClassCastException
354 //
355 // @param caster_klass the class of the object we are casting
356 // @param target_klass the target klass attempt
357 // @return the dynamically allocated exception message (must be freed
358 // by the caller using a resource mark)
359 //
360 // This version does not require access the frame, so it can be called
361 // from interpreted code
362 // The caller (or one of it's callers) must use a ResourceMark
363 // in order to correctly free the result.
364 //
365 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = nullptr);
366
367 // Resolves a call site- may patch in the destination of the call into the
368 // compiled code.
369 static methodHandle resolve_helper(bool is_virtual, bool is_optimized, TRAPS);
370
371 private:
372 // deopt blob
373 static void generate_deopt_blob(void);
374
375 static bool handle_ic_miss_helper_internal(Handle receiver, nmethod* caller_nm, const frame& caller_frame,
376 methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info,
377 bool& needs_ic_stub_refill, TRAPS);
378
379 public:
380 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
381
382 // Resets a call-site in compiled code so it will get resolved again.
383 static methodHandle reresolve_call_site(TRAPS);
384
385 // In the code prolog, if the klass comparison fails, the inline cache
386 // misses and the call site is patched to megamorphic
387 static methodHandle handle_ic_miss_helper(TRAPS);
388
389 // Find the method that called us.
390 static methodHandle find_callee_method(TRAPS);
391
392 static void monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* thread);
393
394 static void monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current);
395
396 // Issue UL warning for unlocked JNI monitor on virtual thread termination
397 static void log_jni_monitor_still_held();
398
399 private:
400 static Handle find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
401 static Handle find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
402
403 static Method* extract_attached_method(vframeStream& vfst);
404
405 #if defined(X86) && defined(COMPILER1)
406 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
407 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
408 #endif // X86 && COMPILER1
409
410 public:
411
412 // Read the array of BasicTypes from a Java signature, and compute where
413 // compiled Java code would like to put the results. Values in reg_lo and
414 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
415 // registers, those above refer to 4-byte stack slots. All stack slots are
416 // based off of the window top. SharedInfo::stack0 refers to the first usable
417 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
418 // 4-bytes higher.
419 // return value is the maximum number of VMReg stack slots the convention will use.
420 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
421
422 static void check_member_name_argument_is_last_argument(const methodHandle& method,
423 const BasicType* sig_bt,
424 const VMRegPair* regs) NOT_DEBUG_RETURN;
425
426 // Ditto except for calling C
427 //
428 // C argument in register AND stack slot.
429 // Some architectures require that an argument must be passed in a register
430 // AND in a stack slot. These architectures provide a second VMRegPair array
431 // to be filled by the c_calling_convention method. On other architectures,
432 // null is being passed as the second VMRegPair array, so arguments are either
433 // passed in a register OR in a stack slot.
434 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
435
436 static int vector_calling_convention(VMRegPair *regs,
437 uint num_bits,
438 uint total_args_passed);
439
440 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
441 // blobs. Unlike adapters in the tiger and earlier releases the code in these
442 // blobs does not create a new frame and are therefore virtually invisible
443 // to the stack walking code. In general these blobs extend the callers stack
444 // as needed for the conversion of argument locations.
445
446 // When calling a c2i blob the code will always call the interpreter even if
447 // by the time we reach the blob there is compiled code available. This allows
448 // the blob to pass the incoming stack pointer (the sender sp) in a known
449 // location for the interpreter to record. This is used by the frame code
450 // to correct the sender code to match up with the stack pointer when the
451 // thread left the compiled code. In addition it allows the interpreter
452 // to remove the space the c2i adapter allocated to do its argument conversion.
453
454 // Although a c2i blob will always run interpreted even if compiled code is
455 // present if we see that compiled code is present the compiled call site
456 // will be patched/re-resolved so that later calls will run compiled.
457
458 // Additionally a c2i blob need to have a unverified entry because it can be reached
459 // in situations where the call site is an inlined cache site and may go megamorphic.
460
461 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
462 // that the interpreter before it does any call dispatch will record the current
463 // stack pointer in the interpreter frame. On return it will restore the stack
464 // pointer as needed. This means the i2c adapter code doesn't need any special
465 // handshaking path with compiled code to keep the stack walking correct.
466
467 static void generate_i2c2i_adapters(MacroAssembler *_masm,
468 int total_args_passed,
469 int max_arg,
470 const BasicType *sig_bt,
471 const VMRegPair *regs,
472 AdapterHandlerEntry* handler);
473
474 static void gen_i2c_adapter(MacroAssembler *_masm,
475 int total_args_passed,
476 int comp_args_on_stack,
477 const BasicType *sig_bt,
478 const VMRegPair *regs);
479
480 // OSR support
481
482 // OSR_migration_begin will extract the jvm state from an interpreter
483 // frame (locals, monitors) and store the data in a piece of C heap
484 // storage. This then allows the interpreter frame to be removed from the
485 // stack and the OSR nmethod to be called. That method is called with a
486 // pointer to the C heap storage. This pointer is the return value from
487 // OSR_migration_begin.
488
489 static intptr_t* OSR_migration_begin(JavaThread *thread);
490
491 // OSR_migration_end is a trivial routine. It is called after the compiled
492 // method has extracted the jvm state from the C heap that OSR_migration_begin
493 // created. It's entire job is to simply free this storage.
494 static void OSR_migration_end(intptr_t* buf);
495
496 // Convert a sig into a calling convention register layout
497 // and find interesting things about it.
498 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
499 static VMReg name_for_receiver();
500
501 // "Top of Stack" slots that may be unused by the calling convention but must
502 // otherwise be preserved.
503 // On Intel these are not necessary and the value can be zero.
504 // On Sparc this describes the words reserved for storing a register window
505 // when an interrupt occurs.
506 static uint out_preserve_stack_slots();
507
508 // Stack slots that may be unused by the calling convention but must
509 // otherwise be preserved. On Intel this includes the return address.
510 // On PowerPC it includes the 4 words holding the old TOC & LR glue.
511 static uint in_preserve_stack_slots();
512
513 static VMReg thread_register();
514
515 static void continuation_enter_cleanup(MacroAssembler* masm);
516
517 // Is vector's size (in bytes) bigger than a size saved by default?
518 // For example, on x86 16 bytes XMM registers are saved by default.
519 static bool is_wide_vector(int size);
520
521 // Save and restore a native result
522 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
523 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
524
525 // Generate a native wrapper for a given method. The method takes arguments
526 // in the Java compiled code convention, marshals them to the native
527 // convention (handlizes oops, etc), transitions to native, makes the call,
528 // returns to java state (possibly blocking), unhandlizes any result and
529 // returns.
530 //
531 // The wrapper may contain special-case code if the given method
532 // is a compiled method handle adapter, such as _invokeBasic, _linkToVirtual, etc.
533 static nmethod* generate_native_wrapper(MacroAssembler* masm,
534 const methodHandle& method,
535 int compile_id,
536 BasicType* sig_bt,
537 VMRegPair* regs,
538 BasicType ret_type);
539
540 // A compiled caller has just called the interpreter, but compiled code
541 // exists. Patch the caller so he no longer calls into the interpreter.
542 static void fixup_callers_callsite(Method* moop, address ret_pc);
543 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
544
545 // Slow-path Locking and Unlocking
546 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
547 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
548
549 // Resolving of calls
550 static address get_resolved_entry (JavaThread* current, methodHandle callee_method);
551 static address resolve_static_call_C (JavaThread* current);
552 static address resolve_virtual_call_C (JavaThread* current);
553 static address resolve_opt_virtual_call_C(JavaThread* current);
554
555 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
556 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
557 oopDesc* dest, jint dest_pos,
558 jint length, JavaThread* thread);
559
560 // handle ic miss with caller being compiled code
561 // wrong method handling (inline cache misses)
562 static address handle_wrong_method(JavaThread* current);
563 static address handle_wrong_method_abstract(JavaThread* current);
564 static address handle_wrong_method_ic_miss(JavaThread* current);
565
566 static address handle_unsafe_access(JavaThread* thread, address next_pc);
567
568 #ifndef PRODUCT
569
570 // Collect and print inline cache miss statistics
571 private:
572 enum { maxICmiss_count = 100 };
573 static int _ICmiss_index; // length of IC miss histogram
574 static int _ICmiss_count[maxICmiss_count]; // miss counts
575 static address _ICmiss_at[maxICmiss_count]; // miss addresses
576 static void trace_ic_miss(address at);
577
578 public:
579 static uint _ic_miss_ctr; // total # of IC misses
580 static uint _wrong_method_ctr;
581 static uint _resolve_static_ctr;
582 static uint _resolve_virtual_ctr;
583 static uint _resolve_opt_virtual_ctr;
584 static uint _implicit_null_throws;
585 static uint _implicit_div0_throws;
586
587 static uint _jbyte_array_copy_ctr; // Slow-path byte array copy
588 static uint _jshort_array_copy_ctr; // Slow-path short array copy
589 static uint _jint_array_copy_ctr; // Slow-path int array copy
590 static uint _jlong_array_copy_ctr; // Slow-path long array copy
591 static uint _oop_array_copy_ctr; // Slow-path oop array copy
592 static uint _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
593 static uint _unsafe_array_copy_ctr; // Slow-path includes alignment checks
594 static uint _generic_array_copy_ctr; // Slow-path includes type decoding
595 static uint _slow_array_copy_ctr; // Slow-path failed out to a method call
596
597 static uint _unsafe_set_memory_ctr; // Slow-path includes alignment checks
598
599 static uint _new_instance_ctr; // 'new' object requires GC
600 static uint _new_array_ctr; // 'new' array requires GC
601 static uint _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
602 static uint _find_handler_ctr; // find exception handler
603 static uint _rethrow_ctr; // rethrow exception
604 static uint _mon_enter_stub_ctr; // monitor enter stub
605 static uint _mon_exit_stub_ctr; // monitor exit stub
606 static uint _mon_enter_ctr; // monitor enter slow
607 static uint _mon_exit_ctr; // monitor exit slow
608 static uint _partial_subtype_ctr; // SubRoutines::partial_subtype_check
609
610 // Statistics code
611 // stats for "normal" compiled calls (non-interface)
612 static int64_t _nof_normal_calls; // total # of calls
613 static int64_t _nof_inlined_calls; // total # of inlined normal calls
614 static int64_t _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
615 static int64_t _nof_inlined_static_calls; // total # of inlined static calls
616 // stats for compiled interface calls
617 static int64_t _nof_interface_calls; // total # of compiled calls
618 static int64_t _nof_inlined_interface_calls; // total # of inlined interface calls
619
620 public: // for compiler
621 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
622 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
623 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
624 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
625 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
626 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
627 static void print_call_statistics(uint64_t comp_total);
628 static void print_ic_miss_histogram();
629
630 #endif // PRODUCT
631
632 static void print_statistics() PRODUCT_RETURN;
633 };
634
635
636 // ---------------------------------------------------------------------------
637 // Implementation of AdapterHandlerLibrary
638 //
639 // This library manages argument marshaling adapters and native wrappers.
640 // There are 2 flavors of adapters: I2C and C2I.
641 //
642 // The I2C flavor takes a stock interpreted call setup, marshals the
643 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
644 // code_begin(). It is broken to call it without an nmethod assigned.
645 // The usual behavior is to lift any register arguments up out of the
646 // stack and possibly re-pack the extra arguments to be contiguous.
647 // I2C adapters will save what the interpreter's stack pointer will be
648 // after arguments are popped, then adjust the interpreter's frame
649 // size to force alignment and possibly to repack the arguments.
650 // After re-packing, it jumps to the compiled code start. There are
651 // no safepoints in this adapter code and a GC cannot happen while
652 // marshaling is in progress.
653 //
654 // The C2I flavor takes a stock compiled call setup plus the target method in
655 // Rmethod, marshals the arguments for an interpreted call and jumps to
656 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
657 // setup. Compiled frames are fixed-size and the args are likely not in the
658 // right place. Hence all the args will likely be copied into the
659 // interpreter's frame, forcing that frame to grow. The compiled frame's
660 // outgoing stack args will be dead after the copy.
661 //
662 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
663 // also perform an official frame push & pop. They have a call to the native
664 // routine in their middles and end in a return (instead of ending in a jump).
665 // The native wrappers are stored in real nmethods instead of the BufferBlobs
666 // used by the adapters. The code generation happens here because it's very
667 // similar to what the adapters have to do.
668
669 class AdapterHandlerEntry : public MetaspaceObj {
670 friend class AdapterHandlerLibrary;
671
672 public:
673 static const int ENTRIES_COUNT = 4;
674
675 private:
676 AdapterFingerPrint* _fingerprint;
677 address _i2c_entry;
678 address _c2i_entry;
679 address _c2i_unverified_entry;
680 address _c2i_no_clinit_check_entry;
681 bool _linked;
682
683 static const char *_entry_names[];
684
685 #ifdef ASSERT
686 // Captures code and signature used to generate this adapter when
687 // verifying adapter equivalence.
688 unsigned char* _saved_code;
689 int _saved_code_length;
690 #endif
691
692 AdapterHandlerEntry(AdapterFingerPrint* fingerprint) :
693 _fingerprint(fingerprint),
694 _i2c_entry(nullptr),
695 _c2i_entry(nullptr),
696 _c2i_unverified_entry(nullptr),
697 _c2i_no_clinit_check_entry(nullptr),
698 _linked(false)
699 #ifdef ASSERT
700 , _saved_code(nullptr),
701 _saved_code_length(0)
702 #endif
703 { }
704
705 ~AdapterHandlerEntry();
706
707 // Allocate on CHeap instead of metaspace (see JDK-8331086).
708 // Dummy argument is used to avoid C++ warning about using
709 // deleted opearator MetaspaceObj::delete().
710 void* operator new(size_t size, size_t dummy) throw() {
711 assert(size == BytesPerWord * heap_word_size(sizeof(AdapterHandlerEntry)), "should match");
712 void* p = AllocateHeap(size, mtCode);
713 memset(p, 0, size);
714 return p;
715 }
716
717 public:
718 static AdapterHandlerEntry* allocate(AdapterFingerPrint* fingerprint) {
719 return new(0) AdapterHandlerEntry(fingerprint);
720 }
721
722 static void deallocate(AdapterHandlerEntry *handler) {
723 handler->~AdapterHandlerEntry();
724 }
725
726 void set_entry_points(address i2c_entry, address c2i_entry, address c2i_unverified_entry, address c2i_no_clinit_check_entry, bool linked = true) {
727 _i2c_entry = i2c_entry;
728 _c2i_entry = c2i_entry;
729 _c2i_unverified_entry = c2i_unverified_entry;
730 _c2i_no_clinit_check_entry = c2i_no_clinit_check_entry;
731 _linked = linked;
732 }
733
734 address get_i2c_entry() const { return _i2c_entry; }
735 address get_c2i_entry() const { return _c2i_entry; }
736 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
737 address get_c2i_no_clinit_check_entry() const { return _c2i_no_clinit_check_entry; }
738
739 static const char* entry_name(int i) {
740 assert(i >=0 && i < ENTRIES_COUNT, "entry id out of range");
741 return _entry_names[i];
742 }
743
744 bool is_linked() const { return _linked; }
745 address base_address();
746 void relocate(address new_base);
747
748 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
749
750 #ifdef ASSERT
751 // Used to verify that code generated for shared adapters is equivalent
752 void save_code (unsigned char* code, int length);
753 bool compare_code(AdapterHandlerEntry* other);
754 #endif
755
756 //virtual void print_on(outputStream* st) const; DO NOT USE
757 void print_adapter_on(outputStream* st) const;
758
759 void metaspace_pointers_do(MetaspaceClosure* it);
760 int size() const {return (int)heap_word_size(sizeof(AdapterHandlerEntry)); }
761 MetaspaceObj::Type type() const { return AdapterHandlerEntryType; }
762
763 void remove_unshareable_info() NOT_CDS_RETURN;
764 void link() NOT_CDS_RETURN;
765 };
766
767 #if INCLUDE_CDS
768 class ArchivedAdapterTable;
769 #endif // INCLUDE_CDS
770
771 class AdapterHandlerLibrary: public AllStatic {
772 friend class SharedRuntime;
773 private:
774 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
775 static AdapterHandlerEntry* _abstract_method_handler;
776 static AdapterHandlerEntry* _no_arg_handler;
777 static AdapterHandlerEntry* _int_arg_handler;
778 static AdapterHandlerEntry* _obj_arg_handler;
779 static AdapterHandlerEntry* _obj_int_arg_handler;
780 static AdapterHandlerEntry* _obj_obj_arg_handler;
781 #if INCLUDE_CDS
782 static ArchivedAdapterTable _aot_adapter_handler_table;
783 #endif // INCLUDE_CDS
784
785 static BufferBlob* buffer_blob();
786 static void initialize();
787 static AdapterHandlerEntry* get_simple_adapter(const methodHandle& method);
788 static AdapterBlob* lookup_aot_cache(AdapterHandlerEntry* handler);
789 static AdapterHandlerEntry* create_adapter(AdapterBlob*& new_adapter,
790 int total_args_passed,
791 BasicType* sig_bt,
792 bool is_transient = false);
793 static void create_abstract_method_handler();
794 static void lookup_simple_adapters() NOT_CDS_RETURN;
795 #ifndef PRODUCT
796 static void print_adapter_handler_info(outputStream* st, AdapterHandlerEntry* handler, AdapterBlob* adapter_blob);
797 #endif // PRODUCT
798 public:
799
800 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint);
801 static void create_native_wrapper(const methodHandle& method);
802 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
803 static AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt);
804 static bool generate_adapter_code(AdapterBlob*& adapter_blob,
805 AdapterHandlerEntry* handler,
806 int total_args_passed,
807 BasicType* sig_bt,
808 bool is_transient);
809
810 #ifdef ASSERT
811 static void verify_adapter_sharing(int total_args_passed, BasicType* sig_bt, AdapterHandlerEntry* cached);
812 #endif // ASSERT
813
814 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
815 static void print_handler_on(outputStream* st, const CodeBlob* b);
816 static bool contains(const CodeBlob* b);
817 static const char* name(AdapterFingerPrint* fingerprint);
818 static uint32_t id(AdapterFingerPrint* fingerprint);
819 #ifndef PRODUCT
820 static void print_statistics();
821 #endif // PRODUCT
822
823 static bool is_abstract_method_adapter(AdapterHandlerEntry* adapter);
824
825 static AdapterBlob* link_aot_adapter_handler(AdapterHandlerEntry* handler) NOT_CDS_RETURN_(nullptr);
826 static void dump_aot_adapter_table() NOT_CDS_RETURN;
827 static void serialize_shared_table_header(SerializeClosure* soc) NOT_CDS_RETURN;
828 static void link_aot_adapters() NOT_CDS_RETURN;
829 };
830
831 #endif // SHARE_RUNTIME_SHAREDRUNTIME_HPP