1 /*
2 * Copyright (c) 1997, 2024, 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 "utilities/macros.hpp"
34
35 class AdapterHandlerEntry;
36 class AdapterFingerPrint;
37 class vframeStream;
38
39 // Runtime is the base class for various runtime interfaces
40 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
41 // shared functionality such as exception forwarding (C++ to
42 // Java exceptions), locking/unlocking mechanisms, statistical
43 // information, etc.
44
45 class SharedRuntime: AllStatic {
46 friend class VMStructs;
47
48 private:
49 static methodHandle resolve_sub_helper(bool is_virtual, bool is_optimized, TRAPS);
50
51 // Shared stub locations
52
53 static RuntimeStub* _wrong_method_blob;
54 static RuntimeStub* _wrong_method_abstract_blob;
55 static RuntimeStub* _ic_miss_blob;
56 static RuntimeStub* _resolve_opt_virtual_call_blob;
57 static RuntimeStub* _resolve_virtual_call_blob;
58 static RuntimeStub* _resolve_static_call_blob;
59 static address _resolve_static_call_entry;
60
61 static DeoptimizationBlob* _deopt_blob;
62
63 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob;
64 static SafepointBlob* _polling_page_safepoint_handler_blob;
65 static SafepointBlob* _polling_page_return_handler_blob;
66
67 #ifdef COMPILER2
68 static UncommonTrapBlob* _uncommon_trap_blob;
69 #endif // COMPILER2
70
71 static nmethod* _cont_doYield_stub;
72
73 #ifndef PRODUCT
74 // Counters
75 static int64_t _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
76 #endif // !PRODUCT
77
78 private:
79 enum { POLL_AT_RETURN, POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
80 static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
81 static RuntimeStub* generate_resolve_blob(address destination, const char* name);
82
83 public:
84 static void generate_stubs(void);
85
86 // max bytes for each dtrace string parameter
87 enum { max_dtrace_string_size = 256 };
88
89 // The following arithmetic routines are used on platforms that do
90 // not have machine instructions to implement their functionality.
91 // Do not remove these.
92
93 // long arithmetics
94 static jlong lmul(jlong y, jlong x);
95 static jlong ldiv(jlong y, jlong x);
96 static jlong lrem(jlong y, jlong x);
97
98 // float and double remainder
99 static jfloat frem(jfloat x, jfloat y);
100 static jdouble drem(jdouble x, jdouble y);
101
102
103 #ifdef _WIN64
104 // Workaround for fmod issue in the Windows x64 CRT
105 static double fmod_winx64(double x, double y);
106 #endif
107
108 #ifdef __SOFTFP__
109 static jfloat fadd(jfloat x, jfloat y);
110 static jfloat fsub(jfloat x, jfloat y);
111 static jfloat fmul(jfloat x, jfloat y);
112 static jfloat fdiv(jfloat x, jfloat y);
113
114 static jdouble dadd(jdouble x, jdouble y);
115 static jdouble dsub(jdouble x, jdouble y);
116 static jdouble dmul(jdouble x, jdouble y);
117 static jdouble ddiv(jdouble x, jdouble y);
118 #endif // __SOFTFP__
119
120 // float conversion (needs to set appropriate rounding mode)
121 static jint f2i (jfloat x);
122 static jlong f2l (jfloat x);
123 static jint d2i (jdouble x);
124 static jlong d2l (jdouble x);
125 static jfloat d2f (jdouble x);
126 static jfloat l2f (jlong x);
127 static jdouble l2d (jlong x);
128 static jfloat i2f (jint x);
129
130 #ifdef __SOFTFP__
131 static jdouble i2d (jint x);
132 static jdouble f2d (jfloat x);
133 #endif // __SOFTFP__
134
135 // double trigonometrics and transcendentals
136 static jdouble dsin(jdouble x);
137 static jdouble dcos(jdouble x);
138 static jdouble dtan(jdouble x);
139 static jdouble dlog(jdouble x);
140 static jdouble dlog10(jdouble x);
141 static jdouble dexp(jdouble x);
142 static jdouble dpow(jdouble x, jdouble y);
143
144 #if defined(__SOFTFP__) || defined(E500V2)
145 static double dabs(double f);
146 #endif
147
148 #if defined(__SOFTFP__) || defined(PPC)
149 static double dsqrt(double f);
150 #endif
151
152 // Montgomery multiplication
153 static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
154 jint len, jlong inv, jint *m_ints);
155 static void montgomery_square(jint *a_ints, jint *n_ints,
156 jint len, jlong inv, jint *m_ints);
157
158 #ifdef __SOFTFP__
159 // C++ compiler generates soft float instructions as well as passing
160 // float and double in registers.
161 static int fcmpl(float x, float y);
162 static int fcmpg(float x, float y);
163 static int dcmpl(double x, double y);
164 static int dcmpg(double x, double y);
165
166 static int unordered_fcmplt(float x, float y);
167 static int unordered_dcmplt(double x, double y);
168 static int unordered_fcmple(float x, float y);
169 static int unordered_dcmple(double x, double y);
170 static int unordered_fcmpge(float x, float y);
171 static int unordered_dcmpge(double x, double y);
172 static int unordered_fcmpgt(float x, float y);
173 static int unordered_dcmpgt(double x, double y);
174
175 static float fneg(float f);
176 static double dneg(double f);
177 #endif
178
179 // exception handling across interpreter/compiler boundaries
180 static address raw_exception_handler_for_return_address(JavaThread* current, address return_address);
181 static address exception_handler_for_return_address(JavaThread* current, address return_address);
182
183 // exception handling and implicit exceptions
184 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
185 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred);
186 enum ImplicitExceptionKind {
187 IMPLICIT_NULL,
188 IMPLICIT_DIVIDE_BY_ZERO,
189 STACK_OVERFLOW
190 };
191 static void throw_AbstractMethodError(JavaThread* current);
192 static void throw_IncompatibleClassChangeError(JavaThread* current);
193 static void throw_ArithmeticException(JavaThread* current);
194 static void throw_NullPointerException(JavaThread* current);
195 static void throw_NullPointerException_at_call(JavaThread* current);
196 static void throw_StackOverflowError(JavaThread* current);
197 static void throw_delayed_StackOverflowError(JavaThread* current);
198 static void throw_StackOverflowError_common(JavaThread* current, bool delayed);
199 static address continuation_for_implicit_exception(JavaThread* current,
200 address faulting_pc,
201 ImplicitExceptionKind exception_kind);
202
203 // Post-slow-path-allocation, pre-initializing-stores step for
204 // implementing e.g. ReduceInitialCardMarks
205 static void on_slowpath_allocation_exit(JavaThread* current);
206
207 static void enable_stack_reserved_zone(JavaThread* current);
208 static frame look_for_reserved_stack_annotated_method(JavaThread* current, frame fr);
209
210 // Shared stub locations
211 static address get_poll_stub(address pc);
212
213 static address get_ic_miss_stub() {
214 assert(_ic_miss_blob!= nullptr, "oops");
215 return _ic_miss_blob->entry_point();
216 }
217
218 static address get_handle_wrong_method_stub() {
219 assert(_wrong_method_blob!= nullptr, "oops");
220 return _wrong_method_blob->entry_point();
221 }
222
223 static address get_handle_wrong_method_abstract_stub() {
224 assert(_wrong_method_abstract_blob!= nullptr, "oops");
225 return _wrong_method_abstract_blob->entry_point();
226 }
227
228 #ifdef COMPILER2
229 static void generate_uncommon_trap_blob(void);
230 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; }
231 #endif // COMPILER2
232
233 static address get_resolve_opt_virtual_call_stub() {
234 assert(_resolve_opt_virtual_call_blob != nullptr, "oops");
235 return _resolve_opt_virtual_call_blob->entry_point();
236 }
237 static address get_resolve_virtual_call_stub() {
238 assert(_resolve_virtual_call_blob != nullptr, "oops");
239 return _resolve_virtual_call_blob->entry_point();
240 }
241 static address get_resolve_static_call_stub() {
242 assert(_resolve_static_call_blob != nullptr, "oops");
243 return _resolve_static_call_blob->entry_point();
244 }
245
246 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
247 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
248 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; }
249
250 static nmethod* cont_doYield_stub() {
251 assert(_cont_doYield_stub != nullptr, "oops");
252 return _cont_doYield_stub;
253 }
254
255 // Counters
256 #ifndef PRODUCT
257 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
258 #endif // PRODUCT
259
260 // Helper routine for full-speed JVMTI exception throwing support
261 static void throw_and_post_jvmti_exception(JavaThread* current, Handle h_exception);
262 static void throw_and_post_jvmti_exception(JavaThread* current, Symbol* name, const char *message = nullptr);
263
264 #if INCLUDE_JVMTI
265 // Functions for JVMTI notifications
266 static void notify_jvmti_vthread_start(oopDesc* vt, jboolean hide, JavaThread* current);
267 static void notify_jvmti_vthread_end(oopDesc* vt, jboolean hide, JavaThread* current);
268 static void notify_jvmti_vthread_mount(oopDesc* vt, jboolean hide, JavaThread* current);
269 static void notify_jvmti_vthread_unmount(oopDesc* vt, jboolean hide, JavaThread* current);
270 #endif
271
272 // RedefineClasses() tracing support for obsolete method entry
273 static int rc_trace_method_entry(JavaThread* thread, Method* m);
274
275 // To be used as the entry point for unresolved native methods.
276 static address native_method_throw_unsatisfied_link_error_entry();
277
278 static void register_finalizer(JavaThread* thread, oopDesc* obj);
279
280 // dtrace notifications
281 static int dtrace_object_alloc(oopDesc* o);
282 static int dtrace_object_alloc(JavaThread* thread, oopDesc* o);
283 static int dtrace_object_alloc(JavaThread* thread, oopDesc* o, size_t size);
284 static int dtrace_method_entry(JavaThread* thread, Method* m);
285 static int dtrace_method_exit(JavaThread* thread, Method* m);
286
287 // Utility method for retrieving the Java thread id, returns 0 if the
288 // thread is not a well formed Java thread.
289 static jlong get_java_tid(JavaThread* thread);
290
291
292 // used by native wrappers to re-enable yellow if overflow happened in native code
293 static void reguard_yellow_pages();
294
295 // Fill in the "X cannot be cast to a Y" message for ClassCastException
296 //
297 // @param thr the current thread
298 // @param caster_klass the class of the object we are casting
299 // @return the dynamically allocated exception message (must be freed
300 // by the caller using a resource mark)
301 //
302 // BCP must refer to the current 'checkcast' opcode for the frame
303 // on top of the stack.
304 // The caller (or one of its callers) must use a ResourceMark
305 // in order to correctly free the result.
306 //
307 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
308
309 // Fill in the "X cannot be cast to a Y" message for ClassCastException
310 //
311 // @param caster_klass the class of the object we are casting
312 // @param target_klass the target klass attempt
313 // @return the dynamically allocated exception message (must be freed
314 // by the caller using a resource mark)
315 //
316 // This version does not require access the frame, so it can be called
317 // from interpreted code
318 // The caller (or one of it's callers) must use a ResourceMark
319 // in order to correctly free the result.
320 //
321 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = nullptr);
322
323 // Resolves a call site- may patch in the destination of the call into the
324 // compiled code.
325 static methodHandle resolve_helper(bool is_virtual, bool is_optimized, TRAPS);
326
327 private:
328 // deopt blob
329 static void generate_deopt_blob(void);
330
331 static bool handle_ic_miss_helper_internal(Handle receiver, nmethod* caller_nm, const frame& caller_frame,
332 methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info,
333 bool& needs_ic_stub_refill, TRAPS);
334
335 public:
336 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
337
338 // Resets a call-site in compiled code so it will get resolved again.
339 static methodHandle reresolve_call_site(TRAPS);
340
341 // In the code prolog, if the klass comparison fails, the inline cache
342 // misses and the call site is patched to megamorphic
343 static methodHandle handle_ic_miss_helper(TRAPS);
344
345 // Find the method that called us.
346 static methodHandle find_callee_method(TRAPS);
347
348 static void monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* thread);
349
350 static void monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current);
351
352 // Issue UL warning for unlocked JNI monitor on virtual thread termination
353 static void log_jni_monitor_still_held();
354
355 private:
356 static Handle find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
357 static Handle find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
358
359 static Method* extract_attached_method(vframeStream& vfst);
360
361 #if defined(X86) && defined(COMPILER1)
362 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
363 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
364 #endif // X86 && COMPILER1
365
366 public:
367
368 // Read the array of BasicTypes from a Java signature, and compute where
369 // compiled Java code would like to put the results. Values in reg_lo and
370 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
371 // registers, those above refer to 4-byte stack slots. All stack slots are
372 // based off of the window top. SharedInfo::stack0 refers to the first usable
373 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
374 // 4-bytes higher.
375 // return value is the maximum number of VMReg stack slots the convention will use.
376 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
377
378 static void check_member_name_argument_is_last_argument(const methodHandle& method,
379 const BasicType* sig_bt,
380 const VMRegPair* regs) NOT_DEBUG_RETURN;
381
382 // Ditto except for calling C
383 //
384 // C argument in register AND stack slot.
385 // Some architectures require that an argument must be passed in a register
386 // AND in a stack slot. These architectures provide a second VMRegPair array
387 // to be filled by the c_calling_convention method. On other architectures,
388 // null is being passed as the second VMRegPair array, so arguments are either
389 // passed in a register OR in a stack slot.
390 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
391
392 static int vector_calling_convention(VMRegPair *regs,
393 uint num_bits,
394 uint total_args_passed);
395
396 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
397 // blobs. Unlike adapters in the tiger and earlier releases the code in these
398 // blobs does not create a new frame and are therefore virtually invisible
399 // to the stack walking code. In general these blobs extend the callers stack
400 // as needed for the conversion of argument locations.
401
402 // When calling a c2i blob the code will always call the interpreter even if
403 // by the time we reach the blob there is compiled code available. This allows
404 // the blob to pass the incoming stack pointer (the sender sp) in a known
405 // location for the interpreter to record. This is used by the frame code
406 // to correct the sender code to match up with the stack pointer when the
407 // thread left the compiled code. In addition it allows the interpreter
408 // to remove the space the c2i adapter allocated to do its argument conversion.
409
410 // Although a c2i blob will always run interpreted even if compiled code is
411 // present if we see that compiled code is present the compiled call site
412 // will be patched/re-resolved so that later calls will run compiled.
413
414 // Additionally a c2i blob need to have a unverified entry because it can be reached
415 // in situations where the call site is an inlined cache site and may go megamorphic.
416
417 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
418 // that the interpreter before it does any call dispatch will record the current
419 // stack pointer in the interpreter frame. On return it will restore the stack
420 // pointer as needed. This means the i2c adapter code doesn't need any special
421 // handshaking path with compiled code to keep the stack walking correct.
422
423 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
424 int total_args_passed,
425 int max_arg,
426 const BasicType *sig_bt,
427 const VMRegPair *regs,
428 AdapterFingerPrint* fingerprint);
429
430 static void gen_i2c_adapter(MacroAssembler *_masm,
431 int total_args_passed,
432 int comp_args_on_stack,
433 const BasicType *sig_bt,
434 const VMRegPair *regs);
435
436 // OSR support
437
438 // OSR_migration_begin will extract the jvm state from an interpreter
439 // frame (locals, monitors) and store the data in a piece of C heap
440 // storage. This then allows the interpreter frame to be removed from the
441 // stack and the OSR nmethod to be called. That method is called with a
442 // pointer to the C heap storage. This pointer is the return value from
443 // OSR_migration_begin.
444
445 static intptr_t* OSR_migration_begin(JavaThread *thread);
446
447 // OSR_migration_end is a trivial routine. It is called after the compiled
448 // method has extracted the jvm state from the C heap that OSR_migration_begin
449 // created. It's entire job is to simply free this storage.
450 static void OSR_migration_end(intptr_t* buf);
451
452 // Convert a sig into a calling convention register layout
453 // and find interesting things about it.
454 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
455 static VMReg name_for_receiver();
456
457 // "Top of Stack" slots that may be unused by the calling convention but must
458 // otherwise be preserved.
459 // On Intel these are not necessary and the value can be zero.
460 // On Sparc this describes the words reserved for storing a register window
461 // when an interrupt occurs.
462 static uint out_preserve_stack_slots();
463
464 // Stack slots that may be unused by the calling convention but must
465 // otherwise be preserved. On Intel this includes the return address.
466 // On PowerPC it includes the 4 words holding the old TOC & LR glue.
467 static uint in_preserve_stack_slots();
468
469 static VMReg thread_register();
470
471 static void continuation_enter_cleanup(MacroAssembler* masm);
472
473 // Is vector's size (in bytes) bigger than a size saved by default?
474 // For example, on x86 16 bytes XMM registers are saved by default.
475 static bool is_wide_vector(int size);
476
477 // Save and restore a native result
478 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
479 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
480
481 // Generate a native wrapper for a given method. The method takes arguments
482 // in the Java compiled code convention, marshals them to the native
483 // convention (handlizes oops, etc), transitions to native, makes the call,
484 // returns to java state (possibly blocking), unhandlizes any result and
485 // returns.
486 //
487 // The wrapper may contain special-case code if the given method
488 // is a compiled method handle adapter, such as _invokeBasic, _linkToVirtual, etc.
489 static nmethod* generate_native_wrapper(MacroAssembler* masm,
490 const methodHandle& method,
491 int compile_id,
492 BasicType* sig_bt,
493 VMRegPair* regs,
494 BasicType ret_type);
495
496 // A compiled caller has just called the interpreter, but compiled code
497 // exists. Patch the caller so he no longer calls into the interpreter.
498 static void fixup_callers_callsite(Method* moop, address ret_pc);
499 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
500
501 // Slow-path Locking and Unlocking
502 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
503 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
504 static void redo_monitorenter(JavaThread* current, ObjectMonitor* monitor);
505
506 // Resolving of calls
507 static address get_resolved_entry (JavaThread* current, methodHandle callee_method);
508 static address resolve_static_call_C (JavaThread* current);
509 static address resolve_virtual_call_C (JavaThread* current);
510 static address resolve_opt_virtual_call_C(JavaThread* current);
511
512 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
513 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
514 oopDesc* dest, jint dest_pos,
515 jint length, JavaThread* thread);
516
517 // handle ic miss with caller being compiled code
518 // wrong method handling (inline cache misses)
519 static address handle_wrong_method(JavaThread* current);
520 static address handle_wrong_method_abstract(JavaThread* current);
521 static address handle_wrong_method_ic_miss(JavaThread* current);
522
523 static address handle_unsafe_access(JavaThread* thread, address next_pc);
524
525 #ifndef PRODUCT
526
527 // Collect and print inline cache miss statistics
528 private:
529 enum { maxICmiss_count = 100 };
530 static int _ICmiss_index; // length of IC miss histogram
531 static int _ICmiss_count[maxICmiss_count]; // miss counts
532 static address _ICmiss_at[maxICmiss_count]; // miss addresses
533 static void trace_ic_miss(address at);
534
535 public:
536 static uint _ic_miss_ctr; // total # of IC misses
537 static uint _wrong_method_ctr;
538 static uint _resolve_static_ctr;
539 static uint _resolve_virtual_ctr;
540 static uint _resolve_opt_virtual_ctr;
541 static uint _implicit_null_throws;
542 static uint _implicit_div0_throws;
543
544 static uint _jbyte_array_copy_ctr; // Slow-path byte array copy
545 static uint _jshort_array_copy_ctr; // Slow-path short array copy
546 static uint _jint_array_copy_ctr; // Slow-path int array copy
547 static uint _jlong_array_copy_ctr; // Slow-path long array copy
548 static uint _oop_array_copy_ctr; // Slow-path oop array copy
549 static uint _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
550 static uint _unsafe_array_copy_ctr; // Slow-path includes alignment checks
551 static uint _generic_array_copy_ctr; // Slow-path includes type decoding
552 static uint _slow_array_copy_ctr; // Slow-path failed out to a method call
553
554 static uint _new_instance_ctr; // 'new' object requires GC
555 static uint _new_array_ctr; // 'new' array requires GC
556 static uint _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
557 static uint _find_handler_ctr; // find exception handler
558 static uint _rethrow_ctr; // rethrow exception
559 static uint _mon_enter_stub_ctr; // monitor enter stub
560 static uint _mon_exit_stub_ctr; // monitor exit stub
561 static uint _mon_enter_ctr; // monitor enter slow
562 static uint _mon_exit_ctr; // monitor exit slow
563 static uint _partial_subtype_ctr; // SubRoutines::partial_subtype_check
564
565 // Statistics code
566 // stats for "normal" compiled calls (non-interface)
567 static int64_t _nof_normal_calls; // total # of calls
568 static int64_t _nof_inlined_calls; // total # of inlined normal calls
569 static int64_t _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
570 static int64_t _nof_inlined_static_calls; // total # of inlined static calls
571 // stats for compiled interface calls
572 static int64_t _nof_interface_calls; // total # of compiled calls
573 static int64_t _nof_inlined_interface_calls; // total # of inlined interface calls
574
575 public: // for compiler
576 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
577 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
578 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
579 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
580 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
581 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
582 static void print_call_statistics(uint64_t comp_total);
583 static void print_ic_miss_histogram();
584
585 #endif // PRODUCT
586
587 static void print_statistics() PRODUCT_RETURN;
588 };
589
590
591 // ---------------------------------------------------------------------------
592 // Implementation of AdapterHandlerLibrary
593 //
594 // This library manages argument marshaling adapters and native wrappers.
595 // There are 2 flavors of adapters: I2C and C2I.
596 //
597 // The I2C flavor takes a stock interpreted call setup, marshals the
598 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
599 // code_begin(). It is broken to call it without an nmethod assigned.
600 // The usual behavior is to lift any register arguments up out of the
601 // stack and possibly re-pack the extra arguments to be contiguous.
602 // I2C adapters will save what the interpreter's stack pointer will be
603 // after arguments are popped, then adjust the interpreter's frame
604 // size to force alignment and possibly to repack the arguments.
605 // After re-packing, it jumps to the compiled code start. There are
606 // no safepoints in this adapter code and a GC cannot happen while
607 // marshaling is in progress.
608 //
609 // The C2I flavor takes a stock compiled call setup plus the target method in
610 // Rmethod, marshals the arguments for an interpreted call and jumps to
611 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
612 // setup. Compiled frames are fixed-size and the args are likely not in the
613 // right place. Hence all the args will likely be copied into the
614 // interpreter's frame, forcing that frame to grow. The compiled frame's
615 // outgoing stack args will be dead after the copy.
616 //
617 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
618 // also perform an official frame push & pop. They have a call to the native
619 // routine in their middles and end in a return (instead of ending in a jump).
620 // The native wrappers are stored in real nmethods instead of the BufferBlobs
621 // used by the adapters. The code generation happens here because it's very
622 // similar to what the adapters have to do.
623
624 class AdapterHandlerEntry : public CHeapObj<mtCode> {
625 friend class AdapterHandlerLibrary;
626
627 private:
628 AdapterFingerPrint* _fingerprint;
629 address _i2c_entry;
630 address _c2i_entry;
631 address _c2i_unverified_entry;
632 address _c2i_no_clinit_check_entry;
633
634 #ifdef ASSERT
635 // Captures code and signature used to generate this adapter when
636 // verifying adapter equivalence.
637 unsigned char* _saved_code;
638 int _saved_code_length;
639 #endif
640
641 AdapterHandlerEntry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry,
642 address c2i_unverified_entry,
643 address c2i_no_clinit_check_entry) :
644 _fingerprint(fingerprint),
645 _i2c_entry(i2c_entry),
646 _c2i_entry(c2i_entry),
647 _c2i_unverified_entry(c2i_unverified_entry),
648 _c2i_no_clinit_check_entry(c2i_no_clinit_check_entry)
649 #ifdef ASSERT
650 , _saved_code_length(0)
651 #endif
652 { }
653
654 ~AdapterHandlerEntry();
655
656 public:
657 address get_i2c_entry() const { return _i2c_entry; }
658 address get_c2i_entry() const { return _c2i_entry; }
659 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
660 address get_c2i_no_clinit_check_entry() const { return _c2i_no_clinit_check_entry; }
661
662 address base_address();
663 void relocate(address new_base);
664
665 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
666
667 #ifdef ASSERT
668 // Used to verify that code generated for shared adapters is equivalent
669 void save_code (unsigned char* code, int length);
670 bool compare_code(AdapterHandlerEntry* other);
671 #endif
672
673 //virtual void print_on(outputStream* st) const; DO NOT USE
674 void print_adapter_on(outputStream* st) const;
675 };
676
677 class AdapterHandlerLibrary: public AllStatic {
678 friend class SharedRuntime;
679 private:
680 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
681 static AdapterHandlerEntry* _abstract_method_handler;
682 static AdapterHandlerEntry* _no_arg_handler;
683 static AdapterHandlerEntry* _int_arg_handler;
684 static AdapterHandlerEntry* _obj_arg_handler;
685 static AdapterHandlerEntry* _obj_int_arg_handler;
686 static AdapterHandlerEntry* _obj_obj_arg_handler;
687
688 static BufferBlob* buffer_blob();
689 static void initialize();
690 static AdapterHandlerEntry* create_adapter(AdapterBlob*& new_adapter,
691 int total_args_passed,
692 BasicType* sig_bt,
693 bool allocate_code_blob);
694 static AdapterHandlerEntry* get_simple_adapter(const methodHandle& method);
695 public:
696
697 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
698 address i2c_entry,
699 address c2i_entry,
700 address c2i_unverified_entry,
701 address c2i_no_clinit_check_entry = nullptr);
702 static void create_native_wrapper(const methodHandle& method);
703 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
704
705 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
706 static void print_handler_on(outputStream* st, const CodeBlob* b);
707 static bool contains(const CodeBlob* b);
708 #ifndef PRODUCT
709 static void print_statistics();
710 #endif // PRODUCT
711
712 };
713
714 #endif // SHARE_RUNTIME_SHAREDRUNTIME_HPP