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.
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23 */
24
25 #ifndef SHARE_RUNTIME_SHAREDRUNTIME_HPP
26 #define SHARE_RUNTIME_SHAREDRUNTIME_HPP
27
28 #include "classfile/compactHashtable.hpp"
29 #include "code/codeBlob.hpp"
30 #include "code/vmreg.hpp"
31 #include "interpreter/linkResolver.hpp"
32 #include "memory/allStatic.hpp"
33 #include "memory/metaspaceClosure.hpp"
34 #include "memory/resourceArea.hpp"
35 #include "runtime/stubDeclarations.hpp"
36 #include "utilities/macros.hpp"
37
38 class AdapterHandlerEntry;
39 class AdapterFingerPrint;
40 class vframeStream;
41 class MetaspaceClosure;
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 // define SharedStubId enum tags: wrong_method_id, etc
50
51 #define SHARED_STUB_ID_ENUM_DECLARE(name, type) STUB_ID_NAME(name),
52 enum class SharedStubId :int {
53 NO_STUBID = -1,
54 SHARED_STUBS_DO(SHARED_STUB_ID_ENUM_DECLARE)
55 NUM_STUBIDS
56 };
57 #undef SHARED_STUB_ID_ENUM_DECLARE
58
59 class SharedRuntime: AllStatic {
60 private:
61 // Declare shared stub fields
62 #define SHARED_STUB_FIELD_DECLARE(name, type) \
63 static type BLOB_FIELD_NAME(name);
64 SHARED_STUBS_DO(SHARED_STUB_FIELD_DECLARE)
65 #undef SHARED_STUB_FIELD_DECLARE
66
67 #ifdef ASSERT
68 static bool is_resolve_id(SharedStubId id) {
69 return (id == SharedStubId::wrong_method_id ||
70 id == SharedStubId::wrong_method_abstract_id ||
71 id == SharedStubId::ic_miss_id ||
72 id == SharedStubId::resolve_opt_virtual_call_id ||
73 id == SharedStubId::resolve_virtual_call_id ||
74 id == SharedStubId::resolve_static_call_id);
75 }
76 static bool is_polling_page_id(SharedStubId id) {
77 return (id == SharedStubId::polling_page_vectors_safepoint_handler_id ||
78 id == SharedStubId::polling_page_safepoint_handler_id ||
79 id == SharedStubId::polling_page_return_handler_id);
80 }
81 static bool is_throw_id(SharedStubId id) {
82 return (id == SharedStubId::throw_AbstractMethodError_id ||
83 id == SharedStubId::throw_IncompatibleClassChangeError_id ||
84 id == SharedStubId::throw_NullPointerException_at_call_id ||
85 id == SharedStubId::throw_StackOverflowError_id ||
86 id == SharedStubId::throw_delayed_StackOverflowError_id);
87 }
88 #endif
89
90 // cont_doYieldStub is not yet folded into the general model for
91 // shared stub/blob handling. It is actually a specially generated
92 // native wrapper for a specific native method, as also is it's
93 // counterpart the continuation do_enter method.
94 static nmethod* _cont_doYield_stub;
95
96 // Stub names indexed by SharedStubId
97 static const char *_stub_names[];
98
99 #ifndef PRODUCT
100 // Counters
101 static int64_t _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
102 #endif // !PRODUCT
103
104 private:
105 static SafepointBlob* generate_handler_blob(SharedStubId id, address call_ptr);
106 static RuntimeStub* generate_resolve_blob(SharedStubId id, address destination);
107 static RuntimeStub* generate_throw_exception(SharedStubId id, address runtime_entry);
108 public:
109 static void generate_initial_stubs(void);
110 static void generate_stubs(void);
111 #if INCLUDE_JFR
112 static void generate_jfr_stubs(void);
113 // For c2: c_rarg0 is junk, call to runtime to write a checkpoint.
114 // It returns a jobject handle to the event writer.
115 // The handle is dereferenced and the return value is the event writer oop.
116 static RuntimeStub* generate_jfr_write_checkpoint();
117 // For c2: call to runtime to return a buffer lease.
118 static RuntimeStub* generate_jfr_return_lease();
119 #endif
120 static void init_adapter_library();
121
122 static const char *stub_name(SharedStubId id) {
123 assert(id > SharedStubId::NO_STUBID && id < SharedStubId::NUM_STUBIDS, "stub id out of range");
124 return _stub_names[(int)id];
125 }
126
127 // max bytes for each dtrace string parameter
128 enum { max_dtrace_string_size = 256 };
129
130 // The following arithmetic routines are used on platforms that do
131 // not have machine instructions to implement their functionality.
132 // Do not remove these.
133
134 // long arithmetics
135 static jlong lmul(jlong y, jlong x);
136 static jlong ldiv(jlong y, jlong x);
137 static jlong lrem(jlong y, jlong x);
138
139 // float and double remainder
140 static jfloat frem(jfloat x, jfloat y);
141 static jdouble drem(jdouble x, jdouble y);
142
143
144 #ifdef _WIN64
145 // Workaround for fmod issue in the Windows x64 CRT
146 static double fmod_winx64(double x, double y);
147 #endif
148
149 #ifdef __SOFTFP__
150 static jfloat fadd(jfloat x, jfloat y);
151 static jfloat fsub(jfloat x, jfloat y);
152 static jfloat fmul(jfloat x, jfloat y);
153 static jfloat fdiv(jfloat x, jfloat y);
154
155 static jdouble dadd(jdouble x, jdouble y);
156 static jdouble dsub(jdouble x, jdouble y);
157 static jdouble dmul(jdouble x, jdouble y);
158 static jdouble ddiv(jdouble x, jdouble y);
159 #endif // __SOFTFP__
160
161 // float conversion (needs to set appropriate rounding mode)
162 static jint f2i (jfloat x);
163 static jlong f2l (jfloat x);
164 static jint d2i (jdouble x);
165 static jlong d2l (jdouble x);
166 static jfloat d2f (jdouble x);
167 static jfloat l2f (jlong x);
168 static jdouble l2d (jlong x);
169 static jfloat i2f (jint x);
170
171 #ifdef __SOFTFP__
172 static jdouble i2d (jint x);
173 static jdouble f2d (jfloat x);
174 #endif // __SOFTFP__
175
176 // double trigonometrics and transcendentals
177 static jdouble dsin(jdouble x);
178 static jdouble dcos(jdouble x);
179 static jdouble dtan(jdouble x);
180 static jdouble dlog(jdouble x);
181 static jdouble dlog10(jdouble x);
182 static jdouble dexp(jdouble x);
183 static jdouble dpow(jdouble x, jdouble y);
184
185 #if defined(__SOFTFP__) || defined(E500V2)
186 static double dabs(double f);
187 #endif
188
189 #if defined(__SOFTFP__)
190 static double dsqrt(double f);
191 #endif
192
193 // Montgomery multiplication
194 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
195 jint len, jlong inv, jint *m_ints);
196 static void montgomery_square(jint *a_ints, jint *n_ints,
197 jint len, jlong inv, jint *m_ints);
198
199 #ifdef __SOFTFP__
200 // C++ compiler generates soft float instructions as well as passing
201 // float and double in registers.
202 static int fcmpl(float x, float y);
203 static int fcmpg(float x, float y);
204 static int dcmpl(double x, double y);
205 static int dcmpg(double x, double y);
206
207 static int unordered_fcmplt(float x, float y);
208 static int unordered_dcmplt(double x, double y);
209 static int unordered_fcmple(float x, float y);
210 static int unordered_dcmple(double x, double y);
211 static int unordered_fcmpge(float x, float y);
212 static int unordered_dcmpge(double x, double y);
213 static int unordered_fcmpgt(float x, float y);
214 static int unordered_dcmpgt(double x, double y);
215
216 static float fneg(float f);
217 static double dneg(double f);
218 #endif
219
220 // exception handling across interpreter/compiler boundaries
221 static address raw_exception_handler_for_return_address(JavaThread* current, address return_address);
222 static address exception_handler_for_return_address(JavaThread* current, address return_address);
223
224 // exception handling and implicit exceptions
225 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
226 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred);
227 enum ImplicitExceptionKind {
228 IMPLICIT_NULL,
229 IMPLICIT_DIVIDE_BY_ZERO,
230 STACK_OVERFLOW
231 };
232 static void throw_AbstractMethodError(JavaThread* current);
233 static void throw_IncompatibleClassChangeError(JavaThread* current);
234 static void throw_ArithmeticException(JavaThread* current);
235 static void throw_NullPointerException(JavaThread* current);
236 static void throw_NullPointerException_at_call(JavaThread* current);
237 static void throw_StackOverflowError(JavaThread* current);
238 static void throw_delayed_StackOverflowError(JavaThread* current);
239 static void throw_StackOverflowError_common(JavaThread* current, bool delayed);
240 static address continuation_for_implicit_exception(JavaThread* current,
241 address faulting_pc,
242 ImplicitExceptionKind exception_kind);
243
244 // Post-slow-path-allocation, pre-initializing-stores step for
245 // implementing e.g. ReduceInitialCardMarks
246 static void on_slowpath_allocation_exit(JavaThread* current);
247
248 static void enable_stack_reserved_zone(JavaThread* current);
249 static frame look_for_reserved_stack_annotated_method(JavaThread* current, frame fr);
250
251 // Shared stub locations
252 static address get_poll_stub(address pc);
253
254 static address get_ic_miss_stub() {
255 assert(_ic_miss_blob!= nullptr, "oops");
256 return _ic_miss_blob->entry_point();
257 }
258
259 static address get_handle_wrong_method_stub() {
260 assert(_wrong_method_blob!= nullptr, "oops");
261 return _wrong_method_blob->entry_point();
262 }
263
264 static address get_handle_wrong_method_abstract_stub() {
265 assert(_wrong_method_abstract_blob!= nullptr, "oops");
266 return _wrong_method_abstract_blob->entry_point();
267 }
268
269 static address get_resolve_opt_virtual_call_stub() {
270 assert(_resolve_opt_virtual_call_blob != nullptr, "oops");
271 return _resolve_opt_virtual_call_blob->entry_point();
272 }
273 static address get_resolve_virtual_call_stub() {
274 assert(_resolve_virtual_call_blob != nullptr, "oops");
275 return _resolve_virtual_call_blob->entry_point();
276 }
277 static address get_resolve_static_call_stub() {
278 assert(_resolve_static_call_blob != nullptr, "oops");
279 return _resolve_static_call_blob->entry_point();
280 }
281
282 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
283 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
284 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; }
285
286 static nmethod* cont_doYield_stub() {
287 assert(_cont_doYield_stub != nullptr, "oops");
288 return _cont_doYield_stub;
289 }
290
291 // Implicit exceptions
292 static address throw_AbstractMethodError_entry() { return _throw_AbstractMethodError_blob->entry_point(); }
293 static address throw_IncompatibleClassChangeError_entry() { return _throw_IncompatibleClassChangeError_blob->entry_point(); }
294 static address throw_NullPointerException_at_call_entry() { return _throw_NullPointerException_at_call_blob->entry_point(); }
295 static address throw_StackOverflowError_entry() { return _throw_StackOverflowError_blob->entry_point(); }
296 static address throw_delayed_StackOverflowError_entry() { return _throw_delayed_StackOverflowError_blob->entry_point(); }
297
298 #if INCLUDE_JFR
299 static address jfr_write_checkpoint() { return _jfr_write_checkpoint_blob->entry_point(); }
300 static address jfr_return_lease() { return _jfr_return_lease_blob->entry_point(); }
301 #endif
302
303 // Counters
304 #ifndef PRODUCT
305 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
306 #endif // PRODUCT
307
308 // Helper routine for full-speed JVMTI exception throwing support
309 static void throw_and_post_jvmti_exception(JavaThread* current, Handle h_exception);
310 static void throw_and_post_jvmti_exception(JavaThread* current, Symbol* name, const char *message = nullptr);
311
312 #if INCLUDE_JVMTI
313 // Functions for JVMTI notifications
314 static void notify_jvmti_vthread_start(oopDesc* vt, jboolean hide, JavaThread* current);
315 static void notify_jvmti_vthread_end(oopDesc* vt, jboolean hide, JavaThread* current);
316 static void notify_jvmti_vthread_mount(oopDesc* vt, jboolean hide, JavaThread* current);
317 static void notify_jvmti_vthread_unmount(oopDesc* vt, jboolean hide, JavaThread* current);
318 #endif
319
320 // RedefineClasses() tracing support for obsolete method entry
321 static int rc_trace_method_entry(JavaThread* thread, Method* m);
322
323 // To be used as the entry point for unresolved native methods.
324 static address native_method_throw_unsatisfied_link_error_entry();
325
326 static void register_finalizer(JavaThread* thread, oopDesc* obj);
327
328 // dtrace notifications
329 static int dtrace_object_alloc(oopDesc* o);
330 static int dtrace_object_alloc(JavaThread* thread, oopDesc* o);
331 static int dtrace_object_alloc(JavaThread* thread, oopDesc* o, size_t size);
332 static int dtrace_method_entry(JavaThread* thread, Method* m);
333 static int dtrace_method_exit(JavaThread* thread, Method* m);
334
335 // Utility method for retrieving the Java thread id, returns 0 if the
336 // thread is not a well formed Java thread.
337 static jlong get_java_tid(JavaThread* thread);
338
339
340 // used by native wrappers to re-enable yellow if overflow happened in native code
341 static void reguard_yellow_pages();
342
343 // Fill in the "X cannot be cast to a Y" message for ClassCastException
344 //
345 // @param thr the current thread
346 // @param caster_klass the class of the object we are casting
347 // @return the dynamically allocated exception message (must be freed
348 // by the caller using a resource mark)
349 //
350 // BCP must refer to the current 'checkcast' opcode for the frame
351 // on top of the stack.
352 // The caller (or one of its callers) must use a ResourceMark
353 // in order to correctly free the result.
354 //
355 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
356
357 // Fill in the "X cannot be cast to a Y" message for ClassCastException
358 //
359 // @param caster_klass the class of the object we are casting
360 // @param target_klass the target klass attempt
361 // @return the dynamically allocated exception message (must be freed
362 // by the caller using a resource mark)
363 //
364 // This version does not require access the frame, so it can be called
365 // from interpreted code
366 // The caller (or one of it's callers) must use a ResourceMark
367 // in order to correctly free the result.
368 //
369 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = nullptr);
370
371 // Resolves a call site- may patch in the destination of the call into the
372 // compiled code.
373 static methodHandle resolve_helper(bool is_virtual, bool is_optimized, TRAPS);
374
375 private:
376 // deopt blob
377 static void generate_deopt_blob(void);
378
379 static bool handle_ic_miss_helper_internal(Handle receiver, nmethod* caller_nm, const frame& caller_frame,
380 methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info,
381 bool& needs_ic_stub_refill, TRAPS);
382
383 public:
384 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
385
386 // Resets a call-site in compiled code so it will get resolved again.
387 static methodHandle reresolve_call_site(TRAPS);
388
389 // In the code prolog, if the klass comparison fails, the inline cache
390 // misses and the call site is patched to megamorphic
391 static methodHandle handle_ic_miss_helper(TRAPS);
392
393 // Find the method that called us.
394 static methodHandle find_callee_method(TRAPS);
395
396 static void monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* thread);
397
398 static void monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current);
399
400 // Issue UL warning for unlocked JNI monitor on virtual thread termination
401 static void log_jni_monitor_still_held();
402
403 private:
404 static Handle find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
405 static Handle find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
406
407 static Method* extract_attached_method(vframeStream& vfst);
408
409 #if defined(X86) && defined(COMPILER1)
410 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
411 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
412 #endif // X86 && COMPILER1
413
414 public:
415
416 // Read the array of BasicTypes from a Java signature, and compute where
417 // compiled Java code would like to put the results. Values in reg_lo and
418 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
419 // registers, those above refer to 4-byte stack slots. All stack slots are
420 // based off of the window top. SharedInfo::stack0 refers to the first usable
421 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
422 // 4-bytes higher.
423 // return value is the maximum number of VMReg stack slots the convention will use.
424 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
425
426 static void check_member_name_argument_is_last_argument(const methodHandle& method,
427 const BasicType* sig_bt,
428 const VMRegPair* regs) NOT_DEBUG_RETURN;
429
430 // Ditto except for calling C
431 //
432 // C argument in register AND stack slot.
433 // Some architectures require that an argument must be passed in a register
434 // AND in a stack slot. These architectures provide a second VMRegPair array
435 // to be filled by the c_calling_convention method. On other architectures,
436 // null is being passed as the second VMRegPair array, so arguments are either
437 // passed in a register OR in a stack slot.
438 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
439
440 static int vector_calling_convention(VMRegPair *regs,
441 uint num_bits,
442 uint total_args_passed);
443
444 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
445 // blobs. Unlike adapters in the tiger and earlier releases the code in these
446 // blobs does not create a new frame and are therefore virtually invisible
447 // to the stack walking code. In general these blobs extend the callers stack
448 // as needed for the conversion of argument locations.
449
450 // When calling a c2i blob the code will always call the interpreter even if
451 // by the time we reach the blob there is compiled code available. This allows
452 // the blob to pass the incoming stack pointer (the sender sp) in a known
453 // location for the interpreter to record. This is used by the frame code
454 // to correct the sender code to match up with the stack pointer when the
455 // thread left the compiled code. In addition it allows the interpreter
456 // to remove the space the c2i adapter allocated to do its argument conversion.
457
458 // Although a c2i blob will always run interpreted even if compiled code is
459 // present if we see that compiled code is present the compiled call site
460 // will be patched/re-resolved so that later calls will run compiled.
461
462 // Additionally a c2i blob need to have a unverified entry because it can be reached
463 // in situations where the call site is an inlined cache site and may go megamorphic.
464
465 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
466 // that the interpreter before it does any call dispatch will record the current
467 // stack pointer in the interpreter frame. On return it will restore the stack
468 // pointer as needed. This means the i2c adapter code doesn't need any special
469 // handshaking path with compiled code to keep the stack walking correct.
470
471 static void generate_i2c2i_adapters(MacroAssembler *_masm,
472 int total_args_passed,
473 int max_arg,
474 const BasicType *sig_bt,
475 const VMRegPair *regs,
476 AdapterHandlerEntry* handler);
477
478 static void gen_i2c_adapter(MacroAssembler *_masm,
479 int total_args_passed,
480 int comp_args_on_stack,
481 const BasicType *sig_bt,
482 const VMRegPair *regs);
483
484 // OSR support
485
486 // OSR_migration_begin will extract the jvm state from an interpreter
487 // frame (locals, monitors) and store the data in a piece of C heap
488 // storage. This then allows the interpreter frame to be removed from the
489 // stack and the OSR nmethod to be called. That method is called with a
490 // pointer to the C heap storage. This pointer is the return value from
491 // OSR_migration_begin.
492
493 static intptr_t* OSR_migration_begin(JavaThread *thread);
494
495 // OSR_migration_end is a trivial routine. It is called after the compiled
496 // method has extracted the jvm state from the C heap that OSR_migration_begin
497 // created. It's entire job is to simply free this storage.
498 static void OSR_migration_end(intptr_t* buf);
499
500 // Convert a sig into a calling convention register layout
501 // and find interesting things about it.
502 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
503 static VMReg name_for_receiver();
504
505 // "Top of Stack" slots that may be unused by the calling convention but must
506 // otherwise be preserved.
507 // On Intel these are not necessary and the value can be zero.
508 // On Sparc this describes the words reserved for storing a register window
509 // when an interrupt occurs.
510 static uint out_preserve_stack_slots();
511
512 // Stack slots that may be unused by the calling convention but must
513 // otherwise be preserved. On Intel this includes the return address.
514 // On PowerPC it includes the 4 words holding the old TOC & LR glue.
515 static uint in_preserve_stack_slots();
516
517 static VMReg thread_register();
518
519 static void continuation_enter_cleanup(MacroAssembler* masm);
520
521 // Is vector's size (in bytes) bigger than a size saved by default?
522 // For example, on x86 16 bytes XMM registers are saved by default.
523 static bool is_wide_vector(int size);
524
525 // Save and restore a native result
526 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
527 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
528
529 // Generate a native wrapper for a given method. The method takes arguments
530 // in the Java compiled code convention, marshals them to the native
531 // convention (handlizes oops, etc), transitions to native, makes the call,
532 // returns to java state (possibly blocking), unhandlizes any result and
533 // returns.
534 //
535 // The wrapper may contain special-case code if the given method
536 // is a compiled method handle adapter, such as _invokeBasic, _linkToVirtual, etc.
537 static nmethod* generate_native_wrapper(MacroAssembler* masm,
538 const methodHandle& method,
539 int compile_id,
540 BasicType* sig_bt,
541 VMRegPair* regs,
542 BasicType ret_type);
543
544 // A compiled caller has just called the interpreter, but compiled code
545 // exists. Patch the caller so he no longer calls into the interpreter.
546 static void fixup_callers_callsite(Method* moop, address ret_pc);
547 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
548
549 // Slow-path Locking and Unlocking
550 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
551 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
552
553 // Resolving of calls
554 static address get_resolved_entry (JavaThread* current, methodHandle callee_method);
555 static address resolve_static_call_C (JavaThread* current);
556 static address resolve_virtual_call_C (JavaThread* current);
557 static address resolve_opt_virtual_call_C(JavaThread* current);
558
559 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
560 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
561 oopDesc* dest, jint dest_pos,
562 jint length, JavaThread* thread);
563
564 // handle ic miss with caller being compiled code
565 // wrong method handling (inline cache misses)
566 static address handle_wrong_method(JavaThread* current);
567 static address handle_wrong_method_abstract(JavaThread* current);
568 static address handle_wrong_method_ic_miss(JavaThread* current);
569
570 static address handle_unsafe_access(JavaThread* thread, address next_pc);
571
572 private:
573 static PerfTickCounters* _perf_resolve_opt_virtual_total_time;
574 static PerfTickCounters* _perf_resolve_virtual_total_time;
575 static PerfTickCounters* _perf_resolve_static_total_time;
576 static PerfTickCounters* _perf_handle_wrong_method_total_time;
577 static PerfTickCounters* _perf_ic_miss_total_time;
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
585 static void print_counters_on(outputStream* st);
586
587 #ifndef PRODUCT
588
589 // Collect and print inline cache miss statistics
590 private:
591 enum { maxICmiss_count = 100 };
592 static int _ICmiss_index; // length of IC miss histogram
593 static int _ICmiss_count[maxICmiss_count]; // miss counts
594 static address _ICmiss_at[maxICmiss_count]; // miss addresses
595 static void trace_ic_miss(address at);
596
597 public:
598 static uint _implicit_null_throws;
599 static uint _implicit_div0_throws;
600
601 static uint _jbyte_array_copy_ctr; // Slow-path byte array copy
602 static uint _jshort_array_copy_ctr; // Slow-path short array copy
603 static uint _jint_array_copy_ctr; // Slow-path int array copy
604 static uint _jlong_array_copy_ctr; // Slow-path long array copy
605 static uint _oop_array_copy_ctr; // Slow-path oop array copy
606 static uint _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
607 static uint _unsafe_array_copy_ctr; // Slow-path includes alignment checks
608 static uint _generic_array_copy_ctr; // Slow-path includes type decoding
609 static uint _slow_array_copy_ctr; // Slow-path failed out to a method call
610
611 static uint _unsafe_set_memory_ctr; // Slow-path includes alignment checks
612
613 static uint _new_instance_ctr; // 'new' object requires GC
614 static uint _new_array_ctr; // 'new' array requires GC
615 static uint _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
616 static uint _find_handler_ctr; // find exception handler
617 static uint _rethrow_ctr; // rethrow exception
618 static uint _mon_enter_stub_ctr; // monitor enter stub
619 static uint _mon_exit_stub_ctr; // monitor exit stub
620 static uint _mon_enter_ctr; // monitor enter slow
621 static uint _mon_exit_ctr; // monitor exit slow
622 static uint _partial_subtype_ctr; // SubRoutines::partial_subtype_check
623
624 // Statistics code
625 // stats for "normal" compiled calls (non-interface)
626 static int64_t _nof_normal_calls; // total # of calls
627 static int64_t _nof_inlined_calls; // total # of inlined normal calls
628 static int64_t _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
629 static int64_t _nof_inlined_static_calls; // total # of inlined static calls
630 // stats for compiled interface calls
631 static int64_t _nof_interface_calls; // total # of compiled calls
632 static int64_t _nof_inlined_interface_calls; // total # of inlined interface calls
633
634 public: // for compiler
635 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
636 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
637 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
638 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
639 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
640 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
641
642 static void print_call_statistics_on(outputStream* st);
643 static void print_ic_miss_histogram_on(outputStream* st);
644 #endif // PRODUCT
645
646 static void print_statistics() PRODUCT_RETURN;
647 };
648
649
650 // ---------------------------------------------------------------------------
651 // Implementation of AdapterHandlerLibrary
652 //
653 // This library manages argument marshaling adapters and native wrappers.
654 // There are 2 flavors of adapters: I2C and C2I.
655 //
656 // The I2C flavor takes a stock interpreted call setup, marshals the
657 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
658 // code_begin(). It is broken to call it without an nmethod assigned.
659 // The usual behavior is to lift any register arguments up out of the
660 // stack and possibly re-pack the extra arguments to be contiguous.
661 // I2C adapters will save what the interpreter's stack pointer will be
662 // after arguments are popped, then adjust the interpreter's frame
663 // size to force alignment and possibly to repack the arguments.
664 // After re-packing, it jumps to the compiled code start. There are
665 // no safepoints in this adapter code and a GC cannot happen while
666 // marshaling is in progress.
667 //
668 // The C2I flavor takes a stock compiled call setup plus the target method in
669 // Rmethod, marshals the arguments for an interpreted call and jumps to
670 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
671 // setup. Compiled frames are fixed-size and the args are likely not in the
672 // right place. Hence all the args will likely be copied into the
673 // interpreter's frame, forcing that frame to grow. The compiled frame's
674 // outgoing stack args will be dead after the copy.
675 //
676 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
677 // also perform an official frame push & pop. They have a call to the native
678 // routine in their middles and end in a return (instead of ending in a jump).
679 // The native wrappers are stored in real nmethods instead of the BufferBlobs
680 // used by the adapters. The code generation happens here because it's very
681 // similar to what the adapters have to do.
682
683 class AdapterHandlerEntry : public MetaspaceObj {
684 friend class AdapterHandlerLibrary;
685
686 public:
687 static const int ENTRIES_COUNT = 4;
688
689 private:
690 AdapterFingerPrint* _fingerprint;
691 address _i2c_entry;
692 address _c2i_entry;
693 address _c2i_unverified_entry;
694 address _c2i_no_clinit_check_entry;
695 bool _linked;
696
697 static const char *_entry_names[];
698
699 #ifdef ASSERT
700 // Captures code and signature used to generate this adapter when
701 // verifying adapter equivalence.
702 unsigned char* _saved_code;
703 int _saved_code_length;
704 #endif
705
706 AdapterHandlerEntry(AdapterFingerPrint* fingerprint) :
707 _fingerprint(fingerprint),
708 _i2c_entry(nullptr),
709 _c2i_entry(nullptr),
710 _c2i_unverified_entry(nullptr),
711 _c2i_no_clinit_check_entry(nullptr),
712 _linked(false)
713 #ifdef ASSERT
714 , _saved_code(nullptr),
715 _saved_code_length(0)
716 #endif
717 { }
718
719 ~AdapterHandlerEntry();
720
721 // Allocate on CHeap instead of metaspace (see JDK-8331086).
722 // Dummy argument is used to avoid C++ warning about using
723 // deleted opearator MetaspaceObj::delete().
724 void* operator new(size_t size, size_t dummy) throw() {
725 void* p = AllocateHeap(size, mtCode);
726 memset(p, 0, size);
727 return p;
728 }
729
730 public:
731 static AdapterHandlerEntry* allocate(AdapterFingerPrint* fingerprint) {
732 return new(0) AdapterHandlerEntry(fingerprint);
733 }
734
735 static void deallocate(AdapterHandlerEntry *handler) {
736 handler->~AdapterHandlerEntry();
737 }
738
739 void set_entry_points(address i2c_entry, address c2i_entry, address c2i_unverified_entry, address c2i_no_clinit_check_entry, bool linked = true) {
740 _i2c_entry = i2c_entry;
741 _c2i_entry = c2i_entry;
742 _c2i_unverified_entry = c2i_unverified_entry;
743 _c2i_no_clinit_check_entry = c2i_no_clinit_check_entry;
744 _linked = linked;
745 }
746
747 address get_i2c_entry() const { return _i2c_entry; }
748 address get_c2i_entry() const { return _c2i_entry; }
749 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
750 address get_c2i_no_clinit_check_entry() const { return _c2i_no_clinit_check_entry; }
751
752 static const char* entry_name(int i) {
753 assert(i >=0 && i < ENTRIES_COUNT, "entry id out of range");
754 return _entry_names[i];
755 }
756
757 bool is_linked() const { return _linked; }
758 address base_address();
759 void relocate(address new_base);
760
761 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
762
763 #ifdef ASSERT
764 // Used to verify that code generated for shared adapters is equivalent
765 void save_code (unsigned char* code, int length);
766 bool compare_code(AdapterHandlerEntry* other);
767 #endif
768
769 //virtual void print_on(outputStream* st) const; DO NOT USE
770 void print_adapter_on(outputStream* st) const;
771
772 void metaspace_pointers_do(MetaspaceClosure* it);
773 int size() const {return (int)heap_word_size(sizeof(AdapterHandlerEntry)); }
774 MetaspaceObj::Type type() const { return AdapterHandlerEntryType; }
775
776 void remove_unshareable_info() NOT_CDS_RETURN;
777 void link() NOT_CDS_RETURN;
778 };
779
780 #if INCLUDE_CDS
781 class ArchivedAdapterTable;
782 #endif // INCLUDE_CDS
783
784 class AdapterHandlerLibrary: public AllStatic {
785 friend class SharedRuntime;
786 private:
787 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
788 static AdapterHandlerEntry* _abstract_method_handler;
789 static AdapterHandlerEntry* _no_arg_handler;
790 static AdapterHandlerEntry* _int_arg_handler;
791 static AdapterHandlerEntry* _obj_arg_handler;
792 static AdapterHandlerEntry* _obj_int_arg_handler;
793 static AdapterHandlerEntry* _obj_obj_arg_handler;
794 #if INCLUDE_CDS
795 static ArchivedAdapterTable _aot_adapter_handler_table;
796 #endif // INCLUDE_CDS
797
798 static BufferBlob* buffer_blob();
799 static void initialize();
800 static AdapterHandlerEntry* get_simple_adapter(const methodHandle& method);
801 static AdapterBlob* lookup_aot_cache(AdapterHandlerEntry* handler);
802 static AdapterHandlerEntry* create_adapter(AdapterBlob*& new_adapter,
803 int total_args_passed,
804 BasicType* sig_bt,
805 bool is_transient = false);
806 static void create_abstract_method_handler();
807 static void lookup_simple_adapters() NOT_CDS_RETURN;
808 #ifndef PRODUCT
809 static void print_adapter_handler_info(outputStream* st, AdapterHandlerEntry* handler, AdapterBlob* adapter_blob);
810 #endif // PRODUCT
811 public:
812
813 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint);
814 static void create_native_wrapper(const methodHandle& method);
815 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
816 static AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt);
817 static bool generate_adapter_code(AdapterBlob*& adapter_blob,
818 AdapterHandlerEntry* handler,
819 int total_args_passed,
820 BasicType* sig_bt,
821 bool is_transient);
822
823 #ifdef ASSERT
824 static void verify_adapter_sharing(int total_args_passed, BasicType* sig_bt, AdapterHandlerEntry* cached);
825 #endif // ASSERT
826
827 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
828 static void print_handler_on(outputStream* st, const CodeBlob* b);
829 static bool contains(const CodeBlob* b);
830 static const char* name(AdapterFingerPrint* fingerprint);
831 static uint32_t id(AdapterFingerPrint* fingerprint);
832 #ifndef PRODUCT
833 static void print_statistics_on(outputStream* st);
834 #endif // PRODUCT
835
836 static bool is_abstract_method_adapter(AdapterHandlerEntry* adapter);
837
838 static AdapterBlob* link_aot_adapter_handler(AdapterHandlerEntry* handler) NOT_CDS_RETURN_(nullptr);
839 static void dump_aot_adapter_table() NOT_CDS_RETURN;
840 static void serialize_shared_table_header(SerializeClosure* soc) NOT_CDS_RETURN;
841 static void link_aot_adapters() NOT_CDS_RETURN;
842 };
843
844 #endif // SHARE_RUNTIME_SHAREDRUNTIME_HPP