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 class ObjectWaiter;
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 class SharedRuntime: AllStatic {
47 friend class VMStructs;
48
49 private:
50 // Shared stub locations
51
52 static RuntimeStub* _wrong_method_blob;
53 static RuntimeStub* _wrong_method_abstract_blob;
54 static RuntimeStub* _ic_miss_blob;
55 static RuntimeStub* _resolve_opt_virtual_call_blob;
56 static RuntimeStub* _resolve_virtual_call_blob;
57 static RuntimeStub* _resolve_static_call_blob;
58 static address _resolve_static_call_entry;
59 static address _native_frame_resume_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 static address native_frame_resume_entry() { return _native_frame_resume_entry; }
204 static void set_native_frame_resume_entry(address val) {
205 assert(_native_frame_resume_entry == nullptr, "");
206 _native_frame_resume_entry = val;
207 }
208
209 // Post-slow-path-allocation, pre-initializing-stores step for
210 // implementing e.g. ReduceInitialCardMarks
211 static void on_slowpath_allocation_exit(JavaThread* current);
212
213 static void enable_stack_reserved_zone(JavaThread* current);
214 static frame look_for_reserved_stack_annotated_method(JavaThread* current, frame fr);
215
216 // Shared stub locations
217 static address get_poll_stub(address pc);
218
219 static address get_ic_miss_stub() {
220 assert(_ic_miss_blob!= nullptr, "oops");
221 return _ic_miss_blob->entry_point();
222 }
223
224 static address get_handle_wrong_method_stub() {
225 assert(_wrong_method_blob!= nullptr, "oops");
226 return _wrong_method_blob->entry_point();
227 }
228
229 static address get_handle_wrong_method_abstract_stub() {
230 assert(_wrong_method_abstract_blob!= nullptr, "oops");
231 return _wrong_method_abstract_blob->entry_point();
232 }
233
234 #ifdef COMPILER2
235 static void generate_uncommon_trap_blob(void);
236 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; }
237 #endif // COMPILER2
238
239 static address get_resolve_opt_virtual_call_stub() {
240 assert(_resolve_opt_virtual_call_blob != nullptr, "oops");
241 return _resolve_opt_virtual_call_blob->entry_point();
242 }
243 static address get_resolve_virtual_call_stub() {
244 assert(_resolve_virtual_call_blob != nullptr, "oops");
245 return _resolve_virtual_call_blob->entry_point();
246 }
247 static address get_resolve_static_call_stub() {
248 assert(_resolve_static_call_blob != nullptr, "oops");
249 return _resolve_static_call_blob->entry_point();
250 }
251
252 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
253 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
254 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; }
255
256 static nmethod* cont_doYield_stub() {
257 assert(_cont_doYield_stub != nullptr, "oops");
258 return _cont_doYield_stub;
259 }
260
261 // Counters
262 #ifndef PRODUCT
263 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
264 #endif // PRODUCT
265
266 // Helper routine for full-speed JVMTI exception throwing support
267 static void throw_and_post_jvmti_exception(JavaThread* current, Handle h_exception);
268 static void throw_and_post_jvmti_exception(JavaThread* current, Symbol* name, const char *message = nullptr);
269
270 #if INCLUDE_JVMTI
271 // Functions for JVMTI notifications
272 static void notify_jvmti_vthread_start(oopDesc* vt, jboolean hide, JavaThread* current);
273 static void notify_jvmti_vthread_end(oopDesc* vt, jboolean hide, JavaThread* current);
274 static void notify_jvmti_vthread_mount(oopDesc* vt, jboolean hide, JavaThread* current);
275 static void notify_jvmti_vthread_unmount(oopDesc* vt, jboolean hide, JavaThread* current);
276 #endif
277
278 // RedefineClasses() tracing support for obsolete method entry
279 static int rc_trace_method_entry(JavaThread* thread, Method* m);
280
281 // To be used as the entry point for unresolved native methods.
282 static address native_method_throw_unsatisfied_link_error_entry();
283
284 static void register_finalizer(JavaThread* thread, oopDesc* obj);
285
286 // dtrace notifications
287 static int dtrace_object_alloc(oopDesc* o);
288 static int dtrace_object_alloc(JavaThread* thread, oopDesc* o);
289 static int dtrace_object_alloc(JavaThread* thread, oopDesc* o, size_t size);
290 static int dtrace_method_entry(JavaThread* thread, Method* m);
291 static int dtrace_method_exit(JavaThread* thread, Method* m);
292
293 // Utility method for retrieving the Java thread id, returns 0 if the
294 // thread is not a well formed Java thread.
295 static jlong get_java_tid(JavaThread* thread);
296
297
298 // used by native wrappers to re-enable yellow if overflow happened in native code
299 static void reguard_yellow_pages();
300
301 // Fill in the "X cannot be cast to a Y" message for ClassCastException
302 //
303 // @param thr the current thread
304 // @param caster_klass the class of the object we are casting
305 // @return the dynamically allocated exception message (must be freed
306 // by the caller using a resource mark)
307 //
308 // BCP must refer to the current 'checkcast' opcode for the frame
309 // on top of the stack.
310 // The caller (or one of its callers) must use a ResourceMark
311 // in order to correctly free the result.
312 //
313 static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);
314
315 // Fill in the "X cannot be cast to a Y" message for ClassCastException
316 //
317 // @param caster_klass the class of the object we are casting
318 // @param target_klass the target klass attempt
319 // @return the dynamically allocated exception message (must be freed
320 // by the caller using a resource mark)
321 //
322 // This version does not require access the frame, so it can be called
323 // from interpreted code
324 // The caller (or one of it's callers) must use a ResourceMark
325 // in order to correctly free the result.
326 //
327 static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = nullptr);
328
329 // Resolves a call site- may patch in the destination of the call into the
330 // compiled code.
331 static methodHandle resolve_helper(bool is_virtual, bool is_optimized, TRAPS);
332
333 private:
334 // deopt blob
335 static void generate_deopt_blob(void);
336
337 static bool handle_ic_miss_helper_internal(Handle receiver, nmethod* caller_nm, const frame& caller_frame,
338 methodHandle callee_method, Bytecodes::Code bc, CallInfo& call_info,
339 bool& needs_ic_stub_refill, TRAPS);
340
341 public:
342 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
343
344 // Resets a call-site in compiled code so it will get resolved again.
345 static methodHandle reresolve_call_site(TRAPS);
346
347 // In the code prolog, if the klass comparison fails, the inline cache
348 // misses and the call site is patched to megamorphic
349 static methodHandle handle_ic_miss_helper(TRAPS);
350
351 // Find the method that called us.
352 static methodHandle find_callee_method(TRAPS);
353
354 static void monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* thread);
355
356 static void monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current);
357
358 // Issue UL warning for unlocked JNI monitor on virtual thread termination
359 static void log_jni_monitor_still_held();
360
361 private:
362 static Handle find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
363 static Handle find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS);
364
365 static Method* extract_attached_method(vframeStream& vfst);
366
367 #if defined(X86) && defined(COMPILER1)
368 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
369 static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);
370 #endif // X86 && COMPILER1
371
372 public:
373
374 // Read the array of BasicTypes from a Java signature, and compute where
375 // compiled Java code would like to put the results. Values in reg_lo and
376 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
377 // registers, those above refer to 4-byte stack slots. All stack slots are
378 // based off of the window top. SharedInfo::stack0 refers to the first usable
379 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
380 // 4-bytes higher.
381 // return value is the maximum number of VMReg stack slots the convention will use.
382 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed);
383
384 static void check_member_name_argument_is_last_argument(const methodHandle& method,
385 const BasicType* sig_bt,
386 const VMRegPair* regs) NOT_DEBUG_RETURN;
387
388 // Ditto except for calling C
389 //
390 // C argument in register AND stack slot.
391 // Some architectures require that an argument must be passed in a register
392 // AND in a stack slot. These architectures provide a second VMRegPair array
393 // to be filled by the c_calling_convention method. On other architectures,
394 // null is being passed as the second VMRegPair array, so arguments are either
395 // passed in a register OR in a stack slot.
396 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
397
398 static int vector_calling_convention(VMRegPair *regs,
399 uint num_bits,
400 uint total_args_passed);
401
402 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
403 // blobs. Unlike adapters in the tiger and earlier releases the code in these
404 // blobs does not create a new frame and are therefore virtually invisible
405 // to the stack walking code. In general these blobs extend the callers stack
406 // as needed for the conversion of argument locations.
407
408 // When calling a c2i blob the code will always call the interpreter even if
409 // by the time we reach the blob there is compiled code available. This allows
410 // the blob to pass the incoming stack pointer (the sender sp) in a known
411 // location for the interpreter to record. This is used by the frame code
412 // to correct the sender code to match up with the stack pointer when the
413 // thread left the compiled code. In addition it allows the interpreter
414 // to remove the space the c2i adapter allocated to do its argument conversion.
415
416 // Although a c2i blob will always run interpreted even if compiled code is
417 // present if we see that compiled code is present the compiled call site
418 // will be patched/re-resolved so that later calls will run compiled.
419
420 // Additionally a c2i blob need to have a unverified entry because it can be reached
421 // in situations where the call site is an inlined cache site and may go megamorphic.
422
423 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
424 // that the interpreter before it does any call dispatch will record the current
425 // stack pointer in the interpreter frame. On return it will restore the stack
426 // pointer as needed. This means the i2c adapter code doesn't need any special
427 // handshaking path with compiled code to keep the stack walking correct.
428
429 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
430 int total_args_passed,
431 int max_arg,
432 const BasicType *sig_bt,
433 const VMRegPair *regs,
434 AdapterFingerPrint* fingerprint);
435
436 static void gen_i2c_adapter(MacroAssembler *_masm,
437 int total_args_passed,
438 int comp_args_on_stack,
439 const BasicType *sig_bt,
440 const VMRegPair *regs);
441
442 // OSR support
443
444 // OSR_migration_begin will extract the jvm state from an interpreter
445 // frame (locals, monitors) and store the data in a piece of C heap
446 // storage. This then allows the interpreter frame to be removed from the
447 // stack and the OSR nmethod to be called. That method is called with a
448 // pointer to the C heap storage. This pointer is the return value from
449 // OSR_migration_begin.
450
451 static intptr_t* OSR_migration_begin(JavaThread *thread);
452
453 // OSR_migration_end is a trivial routine. It is called after the compiled
454 // method has extracted the jvm state from the C heap that OSR_migration_begin
455 // created. It's entire job is to simply free this storage.
456 static void OSR_migration_end(intptr_t* buf);
457
458 // Convert a sig into a calling convention register layout
459 // and find interesting things about it.
460 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);
461 static VMReg name_for_receiver();
462
463 // "Top of Stack" slots that may be unused by the calling convention but must
464 // otherwise be preserved.
465 // On Intel these are not necessary and the value can be zero.
466 // On Sparc this describes the words reserved for storing a register window
467 // when an interrupt occurs.
468 static uint out_preserve_stack_slots();
469
470 // Stack slots that may be unused by the calling convention but must
471 // otherwise be preserved. On Intel this includes the return address.
472 // On PowerPC it includes the 4 words holding the old TOC & LR glue.
473 static uint in_preserve_stack_slots();
474
475 static VMReg thread_register();
476
477 static void continuation_enter_cleanup(MacroAssembler* masm);
478
479 // Is vector's size (in bytes) bigger than a size saved by default?
480 // For example, on x86 16 bytes XMM registers are saved by default.
481 static bool is_wide_vector(int size);
482
483 // Save and restore a native result
484 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
485 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);
486
487 // Generate a native wrapper for a given method. The method takes arguments
488 // in the Java compiled code convention, marshals them to the native
489 // convention (handlizes oops, etc), transitions to native, makes the call,
490 // returns to java state (possibly blocking), unhandlizes any result and
491 // returns.
492 //
493 // The wrapper may contain special-case code if the given method
494 // is a compiled method handle adapter, such as _invokeBasic, _linkToVirtual, etc.
495 static nmethod* generate_native_wrapper(MacroAssembler* masm,
496 const methodHandle& method,
497 int compile_id,
498 BasicType* sig_bt,
499 VMRegPair* regs,
500 BasicType ret_type);
501
502 // A compiled caller has just called the interpreter, but compiled code
503 // exists. Patch the caller so he no longer calls into the interpreter.
504 static void fixup_callers_callsite(Method* moop, address ret_pc);
505 static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);
506
507 // Slow-path Locking and Unlocking
508 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
509 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current);
510 static void resume_monitor_operation(JavaThread* current, ObjectWaiter* node);
511
512 // Resolving of calls
513 static address get_resolved_entry (JavaThread* current, methodHandle callee_method);
514 static address resolve_static_call_C (JavaThread* current);
515 static address resolve_virtual_call_C (JavaThread* current);
516 static address resolve_opt_virtual_call_C(JavaThread* current);
517
518 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
519 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
520 oopDesc* dest, jint dest_pos,
521 jint length, JavaThread* thread);
522
523 // handle ic miss with caller being compiled code
524 // wrong method handling (inline cache misses)
525 static address handle_wrong_method(JavaThread* current);
526 static address handle_wrong_method_abstract(JavaThread* current);
527 static address handle_wrong_method_ic_miss(JavaThread* current);
528
529 static address handle_unsafe_access(JavaThread* thread, address next_pc);
530
531 #ifndef PRODUCT
532
533 // Collect and print inline cache miss statistics
534 private:
535 enum { maxICmiss_count = 100 };
536 static int _ICmiss_index; // length of IC miss histogram
537 static int _ICmiss_count[maxICmiss_count]; // miss counts
538 static address _ICmiss_at[maxICmiss_count]; // miss addresses
539 static void trace_ic_miss(address at);
540
541 public:
542 static uint _ic_miss_ctr; // total # of IC misses
543 static uint _wrong_method_ctr;
544 static uint _resolve_static_ctr;
545 static uint _resolve_virtual_ctr;
546 static uint _resolve_opt_virtual_ctr;
547 static uint _implicit_null_throws;
548 static uint _implicit_div0_throws;
549
550 static uint _jbyte_array_copy_ctr; // Slow-path byte array copy
551 static uint _jshort_array_copy_ctr; // Slow-path short array copy
552 static uint _jint_array_copy_ctr; // Slow-path int array copy
553 static uint _jlong_array_copy_ctr; // Slow-path long array copy
554 static uint _oop_array_copy_ctr; // Slow-path oop array copy
555 static uint _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
556 static uint _unsafe_array_copy_ctr; // Slow-path includes alignment checks
557 static uint _generic_array_copy_ctr; // Slow-path includes type decoding
558 static uint _slow_array_copy_ctr; // Slow-path failed out to a method call
559
560 static uint _unsafe_set_memory_ctr; // Slow-path includes alignment checks
561
562 static uint _new_instance_ctr; // 'new' object requires GC
563 static uint _new_array_ctr; // 'new' array requires GC
564 static uint _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
565 static uint _find_handler_ctr; // find exception handler
566 static uint _rethrow_ctr; // rethrow exception
567 static uint _mon_enter_stub_ctr; // monitor enter stub
568 static uint _mon_exit_stub_ctr; // monitor exit stub
569 static uint _mon_enter_ctr; // monitor enter slow
570 static uint _mon_exit_ctr; // monitor exit slow
571 static uint _partial_subtype_ctr; // SubRoutines::partial_subtype_check
572
573 // Statistics code
574 // stats for "normal" compiled calls (non-interface)
575 static int64_t _nof_normal_calls; // total # of calls
576 static int64_t _nof_inlined_calls; // total # of inlined normal calls
577 static int64_t _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
578 static int64_t _nof_inlined_static_calls; // total # of inlined static calls
579 // stats for compiled interface calls
580 static int64_t _nof_interface_calls; // total # of compiled calls
581 static int64_t _nof_inlined_interface_calls; // total # of inlined interface calls
582
583 public: // for compiler
584 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
585 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
586 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
587 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
588 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
589 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
590 static void print_call_statistics(uint64_t comp_total);
591 static void print_ic_miss_histogram();
592
593 #endif // PRODUCT
594
595 static void print_statistics() PRODUCT_RETURN;
596 };
597
598
599 // ---------------------------------------------------------------------------
600 // Implementation of AdapterHandlerLibrary
601 //
602 // This library manages argument marshaling adapters and native wrappers.
603 // There are 2 flavors of adapters: I2C and C2I.
604 //
605 // The I2C flavor takes a stock interpreted call setup, marshals the
606 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
607 // code_begin(). It is broken to call it without an nmethod assigned.
608 // The usual behavior is to lift any register arguments up out of the
609 // stack and possibly re-pack the extra arguments to be contiguous.
610 // I2C adapters will save what the interpreter's stack pointer will be
611 // after arguments are popped, then adjust the interpreter's frame
612 // size to force alignment and possibly to repack the arguments.
613 // After re-packing, it jumps to the compiled code start. There are
614 // no safepoints in this adapter code and a GC cannot happen while
615 // marshaling is in progress.
616 //
617 // The C2I flavor takes a stock compiled call setup plus the target method in
618 // Rmethod, marshals the arguments for an interpreted call and jumps to
619 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
620 // setup. Compiled frames are fixed-size and the args are likely not in the
621 // right place. Hence all the args will likely be copied into the
622 // interpreter's frame, forcing that frame to grow. The compiled frame's
623 // outgoing stack args will be dead after the copy.
624 //
625 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
626 // also perform an official frame push & pop. They have a call to the native
627 // routine in their middles and end in a return (instead of ending in a jump).
628 // The native wrappers are stored in real nmethods instead of the BufferBlobs
629 // used by the adapters. The code generation happens here because it's very
630 // similar to what the adapters have to do.
631
632 class AdapterHandlerEntry : public CHeapObj<mtCode> {
633 friend class AdapterHandlerLibrary;
634
635 private:
636 AdapterFingerPrint* _fingerprint;
637 address _i2c_entry;
638 address _c2i_entry;
639 address _c2i_unverified_entry;
640 address _c2i_no_clinit_check_entry;
641
642 #ifdef ASSERT
643 // Captures code and signature used to generate this adapter when
644 // verifying adapter equivalence.
645 unsigned char* _saved_code;
646 int _saved_code_length;
647 #endif
648
649 AdapterHandlerEntry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry,
650 address c2i_unverified_entry,
651 address c2i_no_clinit_check_entry) :
652 _fingerprint(fingerprint),
653 _i2c_entry(i2c_entry),
654 _c2i_entry(c2i_entry),
655 _c2i_unverified_entry(c2i_unverified_entry),
656 _c2i_no_clinit_check_entry(c2i_no_clinit_check_entry)
657 #ifdef ASSERT
658 , _saved_code_length(0)
659 #endif
660 { }
661
662 ~AdapterHandlerEntry();
663
664 public:
665 address get_i2c_entry() const { return _i2c_entry; }
666 address get_c2i_entry() const { return _c2i_entry; }
667 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
668 address get_c2i_no_clinit_check_entry() const { return _c2i_no_clinit_check_entry; }
669
670 address base_address();
671 void relocate(address new_base);
672
673 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
674
675 #ifdef ASSERT
676 // Used to verify that code generated for shared adapters is equivalent
677 void save_code (unsigned char* code, int length);
678 bool compare_code(AdapterHandlerEntry* other);
679 #endif
680
681 //virtual void print_on(outputStream* st) const; DO NOT USE
682 void print_adapter_on(outputStream* st) const;
683 };
684
685 class AdapterHandlerLibrary: public AllStatic {
686 friend class SharedRuntime;
687 private:
688 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
689 static AdapterHandlerEntry* _abstract_method_handler;
690 static AdapterHandlerEntry* _no_arg_handler;
691 static AdapterHandlerEntry* _int_arg_handler;
692 static AdapterHandlerEntry* _obj_arg_handler;
693 static AdapterHandlerEntry* _obj_int_arg_handler;
694 static AdapterHandlerEntry* _obj_obj_arg_handler;
695
696 static BufferBlob* buffer_blob();
697 static void initialize();
698 static AdapterHandlerEntry* create_adapter(AdapterBlob*& new_adapter,
699 int total_args_passed,
700 BasicType* sig_bt,
701 bool allocate_code_blob);
702 static AdapterHandlerEntry* get_simple_adapter(const methodHandle& method);
703 public:
704
705 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
706 address i2c_entry,
707 address c2i_entry,
708 address c2i_unverified_entry,
709 address c2i_no_clinit_check_entry = nullptr);
710 static void create_native_wrapper(const methodHandle& method);
711 static AdapterHandlerEntry* get_adapter(const methodHandle& method);
712
713 static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); }
714 static void print_handler_on(outputStream* st, const CodeBlob* b);
715 static bool contains(const CodeBlob* b);
716 #ifndef PRODUCT
717 static void print_statistics();
718 #endif // PRODUCT
719
720 };
721
722 #endif // SHARE_RUNTIME_SHAREDRUNTIME_HPP