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