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