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 "code/codeBlob.hpp"
29 #include "code/vmreg.hpp"
30 #include "interpreter/linkResolver.hpp"
31 #include "memory/allStatic.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "runtime/stubDeclarations.hpp"
34 #include "utilities/macros.hpp"
35
36 class AdapterHandlerEntry;
37 class AdapterFingerPrint;
38 class vframeStream;
39
40 // Runtime is the base class for various runtime interfaces
41 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
42 // shared functionality such as exception forwarding (C++ to
43 // Java exceptions), locking/unlocking mechanisms, statistical
44 // information, etc.
45
46 // define SharedStubId enum tags: wrong_method_id, etc
47
48 #define SHARED_STUB_ID_ENUM_DECLARE(name, type) STUB_ID_NAME(name),
49 enum class SharedStubId :int {
50 NO_STUBID = -1,
51 SHARED_STUBS_DO(SHARED_STUB_ID_ENUM_DECLARE)
52 NUM_STUBIDS
53 };
54 #undef SHARED_STUB_ID_ENUM_DECLARE
55
56 class SharedRuntime: AllStatic {
57 private:
58 // Declare shared stub fields
59 #define SHARED_STUB_FIELD_DECLARE(name, type) \
60 static type BLOB_FIELD_NAME(name);
61 SHARED_STUBS_DO(SHARED_STUB_FIELD_DECLARE)
62 #undef SHARED_STUB_FIELD_DECLARE
63
64 #ifdef ASSERT
65 static bool is_resolve_id(SharedStubId id) {
66 return (id == SharedStubId::wrong_method_id ||
67 id == SharedStubId::wrong_method_abstract_id ||
68 id == SharedStubId::ic_miss_id ||
69 id == SharedStubId::resolve_opt_virtual_call_id ||
70 id == SharedStubId::resolve_virtual_call_id ||
71 id == SharedStubId::resolve_static_call_id);
72 }
73 static bool is_polling_page_id(SharedStubId id) {
74 return (id == SharedStubId::polling_page_vectors_safepoint_handler_id ||
75 id == SharedStubId::polling_page_safepoint_handler_id ||
76 id == SharedStubId::polling_page_return_handler_id);
77 }
78 static bool is_throw_id(SharedStubId id) {
79 return (id == SharedStubId::throw_AbstractMethodError_id ||
80 id == SharedStubId::throw_IncompatibleClassChangeError_id ||
81 id == SharedStubId::throw_NullPointerException_at_call_id ||
82 id == SharedStubId::throw_StackOverflowError_id ||
83 id == SharedStubId::throw_delayed_StackOverflowError_id);
84 }
85 #endif
86
87 // Stub names indexed by SharedStubId
88 static const char *_stub_names[];
89
90 #ifndef PRODUCT
91 // Counters
92 static int64_t _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
93 #endif // !PRODUCT
94
95 private:
96 static SafepointBlob* generate_handler_blob(SharedStubId id, address call_ptr);
97 static RuntimeStub* generate_resolve_blob(SharedStubId id, address destination);
98 static RuntimeStub* generate_throw_exception(SharedStubId id, address runtime_entry);
99 public:
100 static void generate_initial_stubs(void);
101 static void generate_stubs(void);
102 #if INCLUDE_JFR
103 static void generate_jfr_stubs(void);
104 // For c2: c_rarg0 is junk, call to runtime to write a checkpoint.
105 // It returns a jobject handle to the event writer.
106 // The handle is dereferenced and the return value is the event writer oop.
107 static RuntimeStub* generate_jfr_write_checkpoint();
108 // For c2: call to runtime to return a buffer lease.
109 static RuntimeStub* generate_jfr_return_lease();
110 #endif
111
112 static const char *stub_name(SharedStubId id) {
113 assert(id > SharedStubId::NO_STUBID && id < SharedStubId::NUM_STUBIDS, "stub id out of range");
114 return _stub_names[(int)id];
115 }
116
117 // max bytes for each dtrace string parameter
118 enum { max_dtrace_string_size = 256 };
119
120 // The following arithmetic routines are used on platforms that do
121 // not have machine instructions to implement their functionality.
122 // Do not remove these.
123
124 // long arithmetics
125 static jlong lmul(jlong y, jlong x);
126 static jlong ldiv(jlong y, jlong x);
127 static jlong lrem(jlong y, jlong x);
128
129 // float and double remainder
130 static jfloat frem(jfloat x, jfloat y);
131 static jdouble drem(jdouble x, jdouble y);
132
133
134 #ifdef _WIN64
135 // Workaround for fmod issue in the Windows x64 CRT
136 static double fmod_winx64(double x, double y);
137 #endif
138
139 #ifdef __SOFTFP__
140 static jfloat fadd(jfloat x, jfloat y);
141 static jfloat fsub(jfloat x, jfloat y);
142 static jfloat fmul(jfloat x, jfloat y);
143 static jfloat fdiv(jfloat x, jfloat y);
144
145 static jdouble dadd(jdouble x, jdouble y);
146 static jdouble dsub(jdouble x, jdouble y);
147 static jdouble dmul(jdouble x, jdouble y);
148 static jdouble ddiv(jdouble x, jdouble y);
149 #endif // __SOFTFP__
150
151 // float conversion (needs to set appropriate rounding mode)
152 static jint f2i (jfloat x);
153 static jlong f2l (jfloat x);
154 static jint d2i (jdouble x);
155 static jlong d2l (jdouble x);
156 static jfloat d2f (jdouble x);
157 static jfloat l2f (jlong x);
158 static jdouble l2d (jlong x);
159 static jfloat i2f (jint x);
160
161 #ifdef __SOFTFP__
162 static jdouble i2d (jint x);
163 static jdouble f2d (jfloat x);
164 #endif // __SOFTFP__
165
166 // double trigonometrics and transcendentals
167 static jdouble dsin(jdouble x);
168 static jdouble dcos(jdouble x);
169 static jdouble dtan(jdouble x);
170 static jdouble dlog(jdouble x);
171 static jdouble dlog10(jdouble x);
172 static jdouble dexp(jdouble x);
173 static jdouble dpow(jdouble x, jdouble y);
174
175 #if defined(__SOFTFP__) || defined(E500V2)
176 static double dabs(double f);
177 #endif
178
179 #if defined(__SOFTFP__) || defined(PPC)
180 static double dsqrt(double f);
181 #endif
182
183 // Montgomery multiplication
184 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
185 jint len, jlong inv, jint *m_ints);
186 static void montgomery_square(jint *a_ints, jint *n_ints,
187 jint len, jlong inv, jint *m_ints);
188
189 #ifdef __SOFTFP__
190 // C++ compiler generates soft float instructions as well as passing
191 // float and double in registers.
192 static int fcmpl(float x, float y);
193 static int fcmpg(float x, float y);
194 static int dcmpl(double x, double y);
195 static int dcmpg(double x, double y);
196
197 static int unordered_fcmplt(float x, float y);
198 static int unordered_dcmplt(double x, double y);
199 static int unordered_fcmple(float x, float y);
200 static int unordered_dcmple(double x, double y);
201 static int unordered_fcmpge(float x, float y);
202 static int unordered_dcmpge(double x, double y);
203 static int unordered_fcmpgt(float x, float y);
204 static int unordered_dcmpgt(double x, double y);
205
206 static float fneg(float f);
207 static double dneg(double f);
208 #endif
209
210 // exception handling across interpreter/compiler boundaries
211 static address raw_exception_handler_for_return_address(JavaThread* current, address return_address);
212 static address exception_handler_for_return_address(JavaThread* current, address return_address);
213
214 // exception handling and implicit exceptions
215 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
216 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred);
217 enum ImplicitExceptionKind {
218 IMPLICIT_NULL,
219 IMPLICIT_DIVIDE_BY_ZERO,
220 STACK_OVERFLOW
221 };
222 static void throw_AbstractMethodError(JavaThread* current);
223 static void throw_IncompatibleClassChangeError(JavaThread* current);
224 static void throw_ArithmeticException(JavaThread* current);
225 static void throw_NullPointerException(JavaThread* current);
226 static void throw_NullPointerException_at_call(JavaThread* current);
227 static void throw_StackOverflowError(JavaThread* current);
228 static void throw_delayed_StackOverflowError(JavaThread* current);
229 static void throw_StackOverflowError_common(JavaThread* current, bool delayed);
230 static address continuation_for_implicit_exception(JavaThread* current,
231 address faulting_pc,
232 ImplicitExceptionKind exception_kind);
233
234 // Post-slow-path-allocation, pre-initializing-stores step for
235 // implementing e.g. ReduceInitialCardMarks
236 static void on_slowpath_allocation_exit(JavaThread* current);
237
238 static void enable_stack_reserved_zone(JavaThread* current);
239 static frame look_for_reserved_stack_annotated_method(JavaThread* current, frame fr);
240
241 // Shared stub locations
242 static address get_poll_stub(address pc);
243
244 static address get_ic_miss_stub() {
245 assert(_ic_miss_blob!= nullptr, "oops");
246 return _ic_miss_blob->entry_point();
247 }
248
249 static address get_handle_wrong_method_stub() {
250 assert(_wrong_method_blob!= nullptr, "oops");
251 return _wrong_method_blob->entry_point();
252 }
253
254 static address get_handle_wrong_method_abstract_stub() {
255 assert(_wrong_method_abstract_blob!= nullptr, "oops");
256 return _wrong_method_abstract_blob->entry_point();
257 }
258
259 static address get_resolve_opt_virtual_call_stub() {
260 assert(_resolve_opt_virtual_call_blob != nullptr, "oops");
261 return _resolve_opt_virtual_call_blob->entry_point();
262 }
263 static address get_resolve_virtual_call_stub() {
264 assert(_resolve_virtual_call_blob != nullptr, "oops");
265 return _resolve_virtual_call_blob->entry_point();
266 }
267 static address get_resolve_static_call_stub() {
268 assert(_resolve_static_call_blob != nullptr, "oops");
269 return _resolve_static_call_blob->entry_point();
270 }
271
272 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
273 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
274 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; }
275
276 // Implicit exceptions
277 static address throw_AbstractMethodError_entry() { return _throw_AbstractMethodError_blob->entry_point(); }
278 static address throw_IncompatibleClassChangeError_entry() { return _throw_IncompatibleClassChangeError_blob->entry_point(); }
279 static address throw_NullPointerException_at_call_entry() { return _throw_NullPointerException_at_call_blob->entry_point(); }
280 static address throw_StackOverflowError_entry() { return _throw_StackOverflowError_blob->entry_point(); }
281 static address throw_delayed_StackOverflowError_entry() { return _throw_delayed_StackOverflowError_blob->entry_point(); }
282
283 #if INCLUDE_JFR
284 static address jfr_write_checkpoint() { return _jfr_write_checkpoint_blob->entry_point(); }
285 static address jfr_return_lease() { return _jfr_return_lease_blob->entry_point(); }
286 #endif
287
288 // Counters
289 #ifndef PRODUCT
290 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
291 #endif // PRODUCT
292
293 // Helper routine for full-speed JVMTI exception throwing support
294 static void throw_and_post_jvmti_exception(JavaThread* current, Handle h_exception);
295 static void throw_and_post_jvmti_exception(JavaThread* current, Symbol* name, const char *message = nullptr);
296
297 #if INCLUDE_JVMTI
298 // Functions for JVMTI notifications
299 static void notify_jvmti_vthread_start(oopDesc* vt, jboolean hide, JavaThread* current);
300 static void notify_jvmti_vthread_end(oopDesc* vt, jboolean hide, JavaThread* current);
301 static void notify_jvmti_vthread_mount(oopDesc* vt, jboolean hide, JavaThread* current);
302 static void notify_jvmti_vthread_unmount(oopDesc* vt, jboolean hide, JavaThread* current);
303 #endif
304
305 // RedefineClasses() tracing support for obsolete method entry
306 static int rc_trace_method_entry(JavaThread* thread, Method* m);
307
308 // To be used as the entry point for unresolved native methods.
309 static address native_method_throw_unsatisfied_link_error_entry();
310
311 static void register_finalizer(JavaThread* thread, oopDesc* obj);
312
313 // dtrace notifications
314 static int dtrace_object_alloc(oopDesc* o);
315 static int dtrace_object_alloc(JavaThread* thread, oopDesc* o);
316 static int dtrace_object_alloc(JavaThread* thread, oopDesc* o, size_t size);
317 static int dtrace_method_entry(JavaThread* thread, Method* m);
318 static int dtrace_method_exit(JavaThread* thread, Method* m);
319
320 // Utility method for retrieving the Java thread id, returns 0 if the
321 // thread is not a well formed Java thread.
322 static jlong get_java_tid(JavaThread* thread);
323
324
325 // used by native wrappers to re-enable yellow if overflow happened in native code
326 static void reguard_yellow_pages();
327
328 // Fill in the "X cannot be cast to a Y" message for ClassCastException
329 //
330 // @param thr the current thread
331 // @param caster_klass the class of the object we are casting
332 // @return the dynamically allocated exception message (must be freed
333 // by the caller using a resource mark)
334 //
335 // BCP must refer to the current 'checkcast' opcode for the frame
336 // on top of the stack.
337 // The caller (or one of its callers) must use a ResourceMark
338 // in order to correctly free the result.
339 //
340 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
341
342 // Fill in the "X cannot be cast to a Y" message for ClassCastException
343 //
344 // @param caster_klass the class of the object we are casting
345 // @param target_klass the target klass attempt
346 // @return the dynamically allocated exception message (must be freed
347 // by the caller using a resource mark)
348 //
349 // This version does not require access the frame, so it can be called
350 // from interpreted code
351 // The caller (or one of it's callers) must use a ResourceMark
352 // in order to correctly free the result.
353 //
354 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = nullptr);
355
356 // Resolves a call site- may patch in the destination of the call into the
357 // compiled code.
358 static methodHandle resolve_helper(bool is_virtual, bool is_optimized, TRAPS);
359
360 private:
361 // deopt blob
362 static void generate_deopt_blob(void);
363
364 static bool handle_ic_miss_helper_internal(Handle receiver, nmethod* caller_nm, const frame& caller_frame,
365 methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info,
366 bool& needs_ic_stub_refill, TRAPS);
367
368 public:
369 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
370
371 // Resets a call-site in compiled code so it will get resolved again.
372 static methodHandle reresolve_call_site(TRAPS);
373
374 // In the code prolog, if the klass comparison fails, the inline cache
375 // misses and the call site is patched to megamorphic
376 static methodHandle handle_ic_miss_helper(TRAPS);
377
378 // Find the method that called us.
379 static methodHandle find_callee_method(TRAPS);
380
381 static void monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* thread);
382
383 static void monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current);
384
385 // Issue UL warning for unlocked JNI monitor on virtual thread termination
386 static void log_jni_monitor_still_held();
387
388 private:
389 static Handle find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
390 static Handle find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
391
392 static Method* extract_attached_method(vframeStream& vfst);
393
394 #if defined(X86) && defined(COMPILER1)
395 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
396 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
397 #endif // X86 && COMPILER1
398
399 public:
400
401 // Read the array of BasicTypes from a Java signature, and compute where
402 // compiled Java code would like to put the results. Values in reg_lo and
403 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
404 // registers, those above refer to 4-byte stack slots. All stack slots are
405 // based off of the window top. SharedInfo::stack0 refers to the first usable
406 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
407 // 4-bytes higher.
408 // return value is the maximum number of VMReg stack slots the convention will use.
409 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
410
411 static void check_member_name_argument_is_last_argument(const methodHandle& method,
412 const BasicType* sig_bt,
413 const VMRegPair* regs) NOT_DEBUG_RETURN;
414
415 // Ditto except for calling C
416 //
417 // C argument in register AND stack slot.
418 // Some architectures require that an argument must be passed in a register
419 // AND in a stack slot. These architectures provide a second VMRegPair array
420 // to be filled by the c_calling_convention method. On other architectures,
421 // null is being passed as the second VMRegPair array, so arguments are either
422 // passed in a register OR in a stack slot.
423 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
424
425 static int vector_calling_convention(VMRegPair *regs,
426 uint num_bits,
427 uint total_args_passed);
428
429 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
430 // blobs. Unlike adapters in the tiger and earlier releases the code in these
431 // blobs does not create a new frame and are therefore virtually invisible
432 // to the stack walking code. In general these blobs extend the callers stack
433 // as needed for the conversion of argument locations.
434
435 // When calling a c2i blob the code will always call the interpreter even if
436 // by the time we reach the blob there is compiled code available. This allows
437 // the blob to pass the incoming stack pointer (the sender sp) in a known
438 // location for the interpreter to record. This is used by the frame code
439 // to correct the sender code to match up with the stack pointer when the
440 // thread left the compiled code. In addition it allows the interpreter
441 // to remove the space the c2i adapter allocated to do its argument conversion.
442
443 // Although a c2i blob will always run interpreted even if compiled code is
444 // present if we see that compiled code is present the compiled call site
445 // will be patched/re-resolved so that later calls will run compiled.
446
447 // Additionally a c2i blob need to have a unverified entry because it can be reached
448 // in situations where the call site is an inlined cache site and may go megamorphic.
449
450 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
451 // that the interpreter before it does any call dispatch will record the current
452 // stack pointer in the interpreter frame. On return it will restore the stack
453 // pointer as needed. This means the i2c adapter code doesn't need any special
454 // handshaking path with compiled code to keep the stack walking correct.
455
456 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
457 int total_args_passed,
458 int max_arg,
459 const BasicType *sig_bt,
460 const VMRegPair *regs,
461 AdapterFingerPrint* fingerprint);
462
463 static void gen_i2c_adapter(MacroAssembler *_masm,
464 int total_args_passed,
465 int comp_args_on_stack,
466 const BasicType *sig_bt,
467 const VMRegPair *regs);
468
469 // OSR support
470
471 // OSR_migration_begin will extract the jvm state from an interpreter
472 // frame (locals, monitors) and store the data in a piece of C heap
473 // storage. This then allows the interpreter frame to be removed from the
474 // stack and the OSR nmethod to be called. That method is called with a
475 // pointer to the C heap storage. This pointer is the return value from
476 // OSR_migration_begin.
477
478 static intptr_t* OSR_migration_begin(JavaThread *thread);
479
480 // OSR_migration_end is a trivial routine. It is called after the compiled
481 // method has extracted the jvm state from the C heap that OSR_migration_begin
482 // created. It's entire job is to simply free this storage.
483 static void OSR_migration_end(intptr_t* buf);
484
485 // Convert a sig into a calling convention register layout
486 // and find interesting things about it.
487 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
488 static VMReg name_for_receiver();
489
490 // "Top of Stack" slots that may be unused by the calling convention but must
491 // otherwise be preserved.
492 // On Intel these are not necessary and the value can be zero.
493 // On Sparc this describes the words reserved for storing a register window
494 // when an interrupt occurs.
495 static uint out_preserve_stack_slots();
496
497 // Stack slots that may be unused by the calling convention but must
498 // otherwise be preserved. On Intel this includes the return address.
499 // On PowerPC it includes the 4 words holding the old TOC & LR glue.
500 static uint in_preserve_stack_slots();
501
502 static VMReg thread_register();
503
504 static void continuation_enter_cleanup(MacroAssembler* masm);
505
506 // Is vector's size (in bytes) bigger than a size saved by default?
507 // For example, on x86 16 bytes XMM registers are saved by default.
508 static bool is_wide_vector(int size);
509
510 // Save and restore a native result
511 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
512 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
513
514 // Generate a native wrapper for a given method. The method takes arguments
515 // in the Java compiled code convention, marshals them to the native
516 // convention (handlizes oops, etc), transitions to native, makes the call,
517 // returns to java state (possibly blocking), unhandlizes any result and
518 // returns.
519 //
520 // The wrapper may contain special-case code if the given method
521 // is a compiled method handle adapter, such as _invokeBasic, _linkToVirtual, etc.
522 static nmethod* generate_native_wrapper(MacroAssembler* masm,
523 const methodHandle& method,
524 int compile_id,
525 BasicType* sig_bt,
526 VMRegPair* regs,
527 BasicType ret_type);
528
529 // A compiled caller has just called the interpreter, but compiled code
530 // exists. Patch the caller so he no longer calls into the interpreter.
531 static void fixup_callers_callsite(Method* moop, address ret_pc);
532 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
533
534 // Slow-path Locking and Unlocking
535 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
536 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
537
538 // Resolving of calls
539 static address get_resolved_entry (JavaThread* current, methodHandle callee_method);
540 static address resolve_static_call_C (JavaThread* current);
541 static address resolve_virtual_call_C (JavaThread* current);
542 static address resolve_opt_virtual_call_C(JavaThread* current);
543
544 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
545 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
546 oopDesc* dest, jint dest_pos,
547 jint length, JavaThread* thread);
548
549 // handle ic miss with caller being compiled code
550 // wrong method handling (inline cache misses)
551 static address handle_wrong_method(JavaThread* current);
552 static address handle_wrong_method_abstract(JavaThread* current);
553 static address handle_wrong_method_ic_miss(JavaThread* current);
554
555 static address handle_unsafe_access(JavaThread* thread, address next_pc);
556
557 #ifndef PRODUCT
558
559 // Collect and print inline cache miss statistics
560 private:
561 enum { maxICmiss_count = 100 };
562 static int _ICmiss_index; // length of IC miss histogram
563 static int _ICmiss_count[maxICmiss_count]; // miss counts
564 static address _ICmiss_at[maxICmiss_count]; // miss addresses
565 static void trace_ic_miss(address at);
566
567 public:
568 static uint _ic_miss_ctr; // total # of IC misses
569 static uint _wrong_method_ctr;
570 static uint _resolve_static_ctr;
571 static uint _resolve_virtual_ctr;
572 static uint _resolve_opt_virtual_ctr;
573 static uint _implicit_null_throws;
574 static uint _implicit_div0_throws;
575
576 static uint _jbyte_array_copy_ctr; // Slow-path byte array copy
577 static uint _jshort_array_copy_ctr; // Slow-path short array copy
578 static uint _jint_array_copy_ctr; // Slow-path int array copy
579 static uint _jlong_array_copy_ctr; // Slow-path long array copy
580 static uint _oop_array_copy_ctr; // Slow-path oop array copy
581 static uint _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
582 static uint _unsafe_array_copy_ctr; // Slow-path includes alignment checks
583 static uint _generic_array_copy_ctr; // Slow-path includes type decoding
584 static uint _slow_array_copy_ctr; // Slow-path failed out to a method call
585
586 static uint _unsafe_set_memory_ctr; // Slow-path includes alignment checks
587
588 static uint _new_instance_ctr; // 'new' object requires GC
589 static uint _new_array_ctr; // 'new' array requires GC
590 static uint _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
591 static uint _find_handler_ctr; // find exception handler
592 static uint _rethrow_ctr; // rethrow exception
593 static uint _mon_enter_stub_ctr; // monitor enter stub
594 static uint _mon_exit_stub_ctr; // monitor exit stub
595 static uint _mon_enter_ctr; // monitor enter slow
596 static uint _mon_exit_ctr; // monitor exit slow
597 static uint _partial_subtype_ctr; // SubRoutines::partial_subtype_check
598
599 // Statistics code
600 // stats for "normal" compiled calls (non-interface)
601 static int64_t _nof_normal_calls; // total # of calls
602 static int64_t _nof_inlined_calls; // total # of inlined normal calls
603 static int64_t _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
604 static int64_t _nof_inlined_static_calls; // total # of inlined static calls
605 // stats for compiled interface calls
606 static int64_t _nof_interface_calls; // total # of compiled calls
607 static int64_t _nof_inlined_interface_calls; // total # of inlined interface calls
608
609 public: // for compiler
610 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
611 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
612 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
613 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
614 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
615 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
616 static void print_call_statistics(uint64_t comp_total);
617 static void print_ic_miss_histogram();
618
619 #endif // PRODUCT
620
621 static void print_statistics() PRODUCT_RETURN;
622 };
623
624
625 // ---------------------------------------------------------------------------
626 // Implementation of AdapterHandlerLibrary
627 //
628 // This library manages argument marshaling adapters and native wrappers.
629 // There are 2 flavors of adapters: I2C and C2I.
630 //
631 // The I2C flavor takes a stock interpreted call setup, marshals the
632 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
633 // code_begin(). It is broken to call it without an nmethod assigned.
634 // The usual behavior is to lift any register arguments up out of the
635 // stack and possibly re-pack the extra arguments to be contiguous.
636 // I2C adapters will save what the interpreter's stack pointer will be
637 // after arguments are popped, then adjust the interpreter's frame
638 // size to force alignment and possibly to repack the arguments.
639 // After re-packing, it jumps to the compiled code start. There are
640 // no safepoints in this adapter code and a GC cannot happen while
641 // marshaling is in progress.
642 //
643 // The C2I flavor takes a stock compiled call setup plus the target method in
644 // Rmethod, marshals the arguments for an interpreted call and jumps to
645 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
646 // setup. Compiled frames are fixed-size and the args are likely not in the
647 // right place. Hence all the args will likely be copied into the
648 // interpreter's frame, forcing that frame to grow. The compiled frame's
649 // outgoing stack args will be dead after the copy.
650 //
651 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
652 // also perform an official frame push & pop. They have a call to the native
653 // routine in their middles and end in a return (instead of ending in a jump).
654 // The native wrappers are stored in real nmethods instead of the BufferBlobs
655 // used by the adapters. The code generation happens here because it's very
656 // similar to what the adapters have to do.
657
658 class AdapterHandlerEntry : public CHeapObj<mtCode> {
659 friend class AdapterHandlerLibrary;
660
661 private:
662 AdapterFingerPrint* _fingerprint;
663 address _i2c_entry;
664 address _c2i_entry;
665 address _c2i_unverified_entry;
666 address _c2i_no_clinit_check_entry;
667
668 #ifdef ASSERT
669 // Captures code and signature used to generate this adapter when
670 // verifying adapter equivalence.
671 unsigned char* _saved_code;
672 int _saved_code_length;
673 #endif
674
675 AdapterHandlerEntry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry,
676 address c2i_unverified_entry,
677 address c2i_no_clinit_check_entry) :
678 _fingerprint(fingerprint),
679 _i2c_entry(i2c_entry),
680 _c2i_entry(c2i_entry),
681 _c2i_unverified_entry(c2i_unverified_entry),
682 _c2i_no_clinit_check_entry(c2i_no_clinit_check_entry)
683 #ifdef ASSERT
684 , _saved_code_length(0)
685 #endif
686 { }
687
688 ~AdapterHandlerEntry();
689
690 public:
691 address get_i2c_entry() const { return _i2c_entry; }
692 address get_c2i_entry() const { return _c2i_entry; }
693 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
694 address get_c2i_no_clinit_check_entry() const { return _c2i_no_clinit_check_entry; }
695
696 address base_address();
697 void relocate(address new_base);
698
699 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
700
701 #ifdef ASSERT
702 // Used to verify that code generated for shared adapters is equivalent
703 void save_code (unsigned char* code, int length);
704 bool compare_code(AdapterHandlerEntry* other);
705 #endif
706
707 //virtual void print_on(outputStream* st) const; DO NOT USE
708 void print_adapter_on(outputStream* st) const;
709 };
710
711 class AdapterHandlerLibrary: public AllStatic {
712 friend class SharedRuntime;
713 private:
714 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
715 static AdapterHandlerEntry* _abstract_method_handler;
716 static AdapterHandlerEntry* _no_arg_handler;
717 static AdapterHandlerEntry* _int_arg_handler;
718 static AdapterHandlerEntry* _obj_arg_handler;
719 static AdapterHandlerEntry* _obj_int_arg_handler;
720 static AdapterHandlerEntry* _obj_obj_arg_handler;
721
722 static BufferBlob* buffer_blob();
723 static void initialize();
724 static AdapterHandlerEntry* create_adapter(AdapterBlob*& new_adapter,
725 int total_args_passed,
726 BasicType* sig_bt,
727 bool allocate_code_blob);
728 static AdapterHandlerEntry* get_simple_adapter(const methodHandle& method);
729 public:
730
731 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
732 address i2c_entry,
733 address c2i_entry,
734 address c2i_unverified_entry,
735 address c2i_no_clinit_check_entry = nullptr);
736 static void create_native_wrapper(const methodHandle& method);
737 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
738
739 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
740 static void print_handler_on(outputStream* st, const CodeBlob* b);
741 static bool contains(const CodeBlob* b);
742 #ifndef PRODUCT
743 static void print_statistics();
744 #endif // PRODUCT
745
746 };
747
748 #endif // SHARE_RUNTIME_SHAREDRUNTIME_HPP