1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/archiveBuilder.hpp"
26 #include "cds/archiveUtils.inline.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaClasses.inline.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/vmClasses.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/aotCodeCache.hpp"
33 #include "code/codeCache.hpp"
34 #include "code/compiledIC.hpp"
35 #include "code/nmethod.inline.hpp"
36 #include "code/scopeDesc.hpp"
37 #include "code/vtableStubs.hpp"
38 #include "compiler/abstractCompiler.hpp"
39 #include "compiler/compileBroker.hpp"
40 #include "compiler/disassembler.hpp"
41 #include "gc/shared/barrierSet.hpp"
42 #include "gc/shared/collectedHeap.hpp"
43 #include "interpreter/interpreter.hpp"
44 #include "interpreter/interpreterRuntime.hpp"
45 #include "jvm.h"
46 #include "jfr/jfrEvents.hpp"
47 #include "logging/log.hpp"
48 #include "memory/oopFactory.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.hpp"
51 #include "oops/access.hpp"
52 #include "oops/fieldStreams.inline.hpp"
53 #include "metaprogramming/primitiveConversions.hpp"
54 #include "oops/klass.hpp"
55 #include "oops/method.inline.hpp"
56 #include "oops/objArrayKlass.hpp"
57 #include "oops/objArrayOop.inline.hpp"
58 #include "oops/oop.inline.hpp"
59 #include "oops/inlineKlass.inline.hpp"
60 #include "prims/forte.hpp"
61 #include "prims/jvmtiExport.hpp"
62 #include "prims/jvmtiThreadState.hpp"
63 #include "prims/methodHandles.hpp"
64 #include "prims/nativeLookup.hpp"
65 #include "runtime/arguments.hpp"
66 #include "runtime/atomic.hpp"
67 #include "runtime/basicLock.inline.hpp"
68 #include "runtime/frame.inline.hpp"
69 #include "runtime/handles.inline.hpp"
70 #include "runtime/init.hpp"
71 #include "runtime/interfaceSupport.inline.hpp"
72 #include "runtime/java.hpp"
73 #include "runtime/javaCalls.hpp"
74 #include "runtime/jniHandles.inline.hpp"
75 #include "runtime/perfData.hpp"
76 #include "runtime/sharedRuntime.hpp"
77 #include "runtime/stackWatermarkSet.hpp"
78 #include "runtime/stubRoutines.hpp"
79 #include "runtime/synchronizer.inline.hpp"
80 #include "runtime/timerTrace.hpp"
81 #include "runtime/vframe.inline.hpp"
82 #include "runtime/vframeArray.hpp"
83 #include "runtime/vm_version.hpp"
84 #include "utilities/copy.hpp"
85 #include "utilities/dtrace.hpp"
86 #include "utilities/events.hpp"
87 #include "utilities/globalDefinitions.hpp"
88 #include "utilities/hashTable.hpp"
89 #include "utilities/macros.hpp"
90 #include "utilities/xmlstream.hpp"
91 #ifdef COMPILER1
92 #include "c1/c1_Runtime1.hpp"
93 #endif
94 #if INCLUDE_JFR
95 #include "jfr/jfr.inline.hpp"
96 #endif
97
98 // Shared runtime stub routines reside in their own unique blob with a
99 // single entry point
100
101
102 #define SHARED_STUB_FIELD_DEFINE(name, type) \
103 type* SharedRuntime::BLOB_FIELD_NAME(name);
104 SHARED_STUBS_DO(SHARED_STUB_FIELD_DEFINE)
105 #undef SHARED_STUB_FIELD_DEFINE
106
107 nmethod* SharedRuntime::_cont_doYield_stub;
108
109 #if 0
110 // TODO tweak global stub name generation to match this
111 #define SHARED_STUB_NAME_DECLARE(name, type) "Shared Runtime " # name "_blob",
112 const char *SharedRuntime::_stub_names[] = {
113 SHARED_STUBS_DO(SHARED_STUB_NAME_DECLARE)
114 };
115 #endif
116
117 //----------------------------generate_stubs-----------------------------------
118 void SharedRuntime::generate_initial_stubs() {
119 // Build this early so it's available for the interpreter.
120 _throw_StackOverflowError_blob =
121 generate_throw_exception(StubId::shared_throw_StackOverflowError_id,
122 CAST_FROM_FN_PTR(address, SharedRuntime::throw_StackOverflowError));
123 }
124
125 void SharedRuntime::generate_stubs() {
126 _wrong_method_blob =
127 generate_resolve_blob(StubId::shared_wrong_method_id,
128 CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method));
129 _wrong_method_abstract_blob =
130 generate_resolve_blob(StubId::shared_wrong_method_abstract_id,
131 CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract));
132 _ic_miss_blob =
133 generate_resolve_blob(StubId::shared_ic_miss_id,
134 CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss));
135 _resolve_opt_virtual_call_blob =
136 generate_resolve_blob(StubId::shared_resolve_opt_virtual_call_id,
137 CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C));
138 _resolve_virtual_call_blob =
139 generate_resolve_blob(StubId::shared_resolve_virtual_call_id,
140 CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C));
141 _resolve_static_call_blob =
142 generate_resolve_blob(StubId::shared_resolve_static_call_id,
143 CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C));
144
145 _throw_delayed_StackOverflowError_blob =
146 generate_throw_exception(StubId::shared_throw_delayed_StackOverflowError_id,
147 CAST_FROM_FN_PTR(address, SharedRuntime::throw_delayed_StackOverflowError));
148
149 _throw_AbstractMethodError_blob =
150 generate_throw_exception(StubId::shared_throw_AbstractMethodError_id,
151 CAST_FROM_FN_PTR(address, SharedRuntime::throw_AbstractMethodError));
152
153 _throw_IncompatibleClassChangeError_blob =
154 generate_throw_exception(StubId::shared_throw_IncompatibleClassChangeError_id,
155 CAST_FROM_FN_PTR(address, SharedRuntime::throw_IncompatibleClassChangeError));
156
157 _throw_NullPointerException_at_call_blob =
158 generate_throw_exception(StubId::shared_throw_NullPointerException_at_call_id,
159 CAST_FROM_FN_PTR(address, SharedRuntime::throw_NullPointerException_at_call));
160
161 #if COMPILER2_OR_JVMCI
162 // Vectors are generated only by C2 and JVMCI.
163 bool support_wide = is_wide_vector(MaxVectorSize);
164 if (support_wide) {
165 _polling_page_vectors_safepoint_handler_blob =
166 generate_handler_blob(StubId::shared_polling_page_vectors_safepoint_handler_id,
167 CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception));
168 }
169 #endif // COMPILER2_OR_JVMCI
170 _polling_page_safepoint_handler_blob =
171 generate_handler_blob(StubId::shared_polling_page_safepoint_handler_id,
172 CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception));
173 _polling_page_return_handler_blob =
174 generate_handler_blob(StubId::shared_polling_page_return_handler_id,
175 CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception));
176
177 generate_deopt_blob();
178 }
179
180 void SharedRuntime::init_adapter_library() {
181 AdapterHandlerLibrary::initialize();
182 }
183
184 #if INCLUDE_JFR
185 //------------------------------generate jfr runtime stubs ------
186 void SharedRuntime::generate_jfr_stubs() {
187 ResourceMark rm;
188 const char* timer_msg = "SharedRuntime generate_jfr_stubs";
189 TraceTime timer(timer_msg, TRACETIME_LOG(Info, startuptime));
190
191 _jfr_write_checkpoint_blob = generate_jfr_write_checkpoint();
192 _jfr_return_lease_blob = generate_jfr_return_lease();
193 }
194
195 #endif // INCLUDE_JFR
196
197 #include <math.h>
198
199 // Implementation of SharedRuntime
200
201 #ifndef PRODUCT
202 // For statistics
203 uint SharedRuntime::_ic_miss_ctr = 0;
204 uint SharedRuntime::_wrong_method_ctr = 0;
205 uint SharedRuntime::_resolve_static_ctr = 0;
206 uint SharedRuntime::_resolve_virtual_ctr = 0;
207 uint SharedRuntime::_resolve_opt_virtual_ctr = 0;
208 uint SharedRuntime::_implicit_null_throws = 0;
209 uint SharedRuntime::_implicit_div0_throws = 0;
210
211 int64_t SharedRuntime::_nof_normal_calls = 0;
212 int64_t SharedRuntime::_nof_inlined_calls = 0;
213 int64_t SharedRuntime::_nof_megamorphic_calls = 0;
214 int64_t SharedRuntime::_nof_static_calls = 0;
215 int64_t SharedRuntime::_nof_inlined_static_calls = 0;
216 int64_t SharedRuntime::_nof_interface_calls = 0;
217 int64_t SharedRuntime::_nof_inlined_interface_calls = 0;
218
219 uint SharedRuntime::_new_instance_ctr=0;
220 uint SharedRuntime::_new_array_ctr=0;
221 uint SharedRuntime::_multi2_ctr=0;
222 uint SharedRuntime::_multi3_ctr=0;
223 uint SharedRuntime::_multi4_ctr=0;
224 uint SharedRuntime::_multi5_ctr=0;
225 uint SharedRuntime::_mon_enter_stub_ctr=0;
226 uint SharedRuntime::_mon_exit_stub_ctr=0;
227 uint SharedRuntime::_mon_enter_ctr=0;
228 uint SharedRuntime::_mon_exit_ctr=0;
229 uint SharedRuntime::_partial_subtype_ctr=0;
230 uint SharedRuntime::_jbyte_array_copy_ctr=0;
231 uint SharedRuntime::_jshort_array_copy_ctr=0;
232 uint SharedRuntime::_jint_array_copy_ctr=0;
233 uint SharedRuntime::_jlong_array_copy_ctr=0;
234 uint SharedRuntime::_oop_array_copy_ctr=0;
235 uint SharedRuntime::_checkcast_array_copy_ctr=0;
236 uint SharedRuntime::_unsafe_array_copy_ctr=0;
237 uint SharedRuntime::_generic_array_copy_ctr=0;
238 uint SharedRuntime::_slow_array_copy_ctr=0;
239 uint SharedRuntime::_find_handler_ctr=0;
240 uint SharedRuntime::_rethrow_ctr=0;
241 uint SharedRuntime::_unsafe_set_memory_ctr=0;
242
243 int SharedRuntime::_ICmiss_index = 0;
244 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count];
245 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count];
246
247
248 void SharedRuntime::trace_ic_miss(address at) {
249 for (int i = 0; i < _ICmiss_index; i++) {
250 if (_ICmiss_at[i] == at) {
251 _ICmiss_count[i]++;
252 return;
253 }
254 }
255 int index = _ICmiss_index++;
256 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1;
257 _ICmiss_at[index] = at;
258 _ICmiss_count[index] = 1;
259 }
260
261 void SharedRuntime::print_ic_miss_histogram() {
262 if (ICMissHistogram) {
263 tty->print_cr("IC Miss Histogram:");
264 int tot_misses = 0;
265 for (int i = 0; i < _ICmiss_index; i++) {
266 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", p2i(_ICmiss_at[i]), _ICmiss_count[i]);
267 tot_misses += _ICmiss_count[i];
268 }
269 tty->print_cr("Total IC misses: %7d", tot_misses);
270 }
271 }
272 #endif // PRODUCT
273
274
275 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x))
276 return x * y;
277 JRT_END
278
279
280 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x))
281 if (x == min_jlong && y == CONST64(-1)) {
282 return x;
283 } else {
284 return x / y;
285 }
286 JRT_END
287
288
289 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x))
290 if (x == min_jlong && y == CONST64(-1)) {
291 return 0;
292 } else {
293 return x % y;
294 }
295 JRT_END
296
297
298 #ifdef _WIN64
299 const juint float_sign_mask = 0x7FFFFFFF;
300 const juint float_infinity = 0x7F800000;
301 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF);
302 const julong double_infinity = CONST64(0x7FF0000000000000);
303 #endif
304
305 #if !defined(X86)
306 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y))
307 #ifdef _WIN64
308 // 64-bit Windows on amd64 returns the wrong values for
309 // infinity operands.
310 juint xbits = PrimitiveConversions::cast<juint>(x);
311 juint ybits = PrimitiveConversions::cast<juint>(y);
312 // x Mod Infinity == x unless x is infinity
313 if (((xbits & float_sign_mask) != float_infinity) &&
314 ((ybits & float_sign_mask) == float_infinity) ) {
315 return x;
316 }
317 return ((jfloat)fmod_winx64((double)x, (double)y));
318 #else
319 return ((jfloat)fmod((double)x,(double)y));
320 #endif
321 JRT_END
322
323 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y))
324 #ifdef _WIN64
325 julong xbits = PrimitiveConversions::cast<julong>(x);
326 julong ybits = PrimitiveConversions::cast<julong>(y);
327 // x Mod Infinity == x unless x is infinity
328 if (((xbits & double_sign_mask) != double_infinity) &&
329 ((ybits & double_sign_mask) == double_infinity) ) {
330 return x;
331 }
332 return ((jdouble)fmod_winx64((double)x, (double)y));
333 #else
334 return ((jdouble)fmod((double)x,(double)y));
335 #endif
336 JRT_END
337 #endif // !X86
338
339 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x))
340 return (jfloat)x;
341 JRT_END
342
343 #ifdef __SOFTFP__
344 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y))
345 return x + y;
346 JRT_END
347
348 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y))
349 return x - y;
350 JRT_END
351
352 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y))
353 return x * y;
354 JRT_END
355
356 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y))
357 return x / y;
358 JRT_END
359
360 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y))
361 return x + y;
362 JRT_END
363
364 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y))
365 return x - y;
366 JRT_END
367
368 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y))
369 return x * y;
370 JRT_END
371
372 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y))
373 return x / y;
374 JRT_END
375
376 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x))
377 return (jdouble)x;
378 JRT_END
379
380 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x))
381 return (jdouble)x;
382 JRT_END
383
384 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y))
385 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/
386 JRT_END
387
388 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y))
389 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
390 JRT_END
391
392 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y))
393 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */
394 JRT_END
395
396 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y))
397 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
398 JRT_END
399
400 // Functions to return the opposite of the aeabi functions for nan.
401 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(float x, float y))
402 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
403 JRT_END
404
405 JRT_LEAF(int, SharedRuntime::unordered_dcmplt(double x, double y))
406 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
407 JRT_END
408
409 JRT_LEAF(int, SharedRuntime::unordered_fcmple(float x, float y))
410 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
411 JRT_END
412
413 JRT_LEAF(int, SharedRuntime::unordered_dcmple(double x, double y))
414 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
415 JRT_END
416
417 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y))
418 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
419 JRT_END
420
421 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y))
422 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
423 JRT_END
424
425 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y))
426 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
427 JRT_END
428
429 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y))
430 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
431 JRT_END
432
433 // Intrinsics make gcc generate code for these.
434 float SharedRuntime::fneg(float f) {
435 return -f;
436 }
437
438 double SharedRuntime::dneg(double f) {
439 return -f;
440 }
441
442 #endif // __SOFTFP__
443
444 #if defined(__SOFTFP__) || defined(E500V2)
445 // Intrinsics make gcc generate code for these.
446 double SharedRuntime::dabs(double f) {
447 return (f <= (double)0.0) ? (double)0.0 - f : f;
448 }
449
450 #endif
451
452 #if defined(__SOFTFP__)
453 double SharedRuntime::dsqrt(double f) {
454 return sqrt(f);
455 }
456 #endif
457
458 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x))
459 if (g_isnan(x))
460 return 0;
461 if (x >= (jfloat) max_jint)
462 return max_jint;
463 if (x <= (jfloat) min_jint)
464 return min_jint;
465 return (jint) x;
466 JRT_END
467
468
469 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x))
470 if (g_isnan(x))
471 return 0;
472 if (x >= (jfloat) max_jlong)
473 return max_jlong;
474 if (x <= (jfloat) min_jlong)
475 return min_jlong;
476 return (jlong) x;
477 JRT_END
478
479
480 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x))
481 if (g_isnan(x))
482 return 0;
483 if (x >= (jdouble) max_jint)
484 return max_jint;
485 if (x <= (jdouble) min_jint)
486 return min_jint;
487 return (jint) x;
488 JRT_END
489
490
491 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x))
492 if (g_isnan(x))
493 return 0;
494 if (x >= (jdouble) max_jlong)
495 return max_jlong;
496 if (x <= (jdouble) min_jlong)
497 return min_jlong;
498 return (jlong) x;
499 JRT_END
500
501
502 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x))
503 return (jfloat)x;
504 JRT_END
505
506
507 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x))
508 return (jfloat)x;
509 JRT_END
510
511
512 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x))
513 return (jdouble)x;
514 JRT_END
515
516
517 // Exception handling across interpreter/compiler boundaries
518 //
519 // exception_handler_for_return_address(...) returns the continuation address.
520 // The continuation address is the entry point of the exception handler of the
521 // previous frame depending on the return address.
522
523 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* current, address return_address) {
524 // Note: This is called when we have unwound the frame of the callee that did
525 // throw an exception. So far, no check has been performed by the StackWatermarkSet.
526 // Notably, the stack is not walkable at this point, and hence the check must
527 // be deferred until later. Specifically, any of the handlers returned here in
528 // this function, will get dispatched to, and call deferred checks to
529 // StackWatermarkSet::after_unwind at a point where the stack is walkable.
530 assert(frame::verify_return_pc(return_address), "must be a return address: " INTPTR_FORMAT, p2i(return_address));
531 assert(current->frames_to_pop_failed_realloc() == 0 || Interpreter::contains(return_address), "missed frames to pop?");
532
533 // Reset method handle flag.
534 current->set_is_method_handle_return(false);
535
536 #if INCLUDE_JVMCI
537 // JVMCI's ExceptionHandlerStub expects the thread local exception PC to be clear
538 // and other exception handler continuations do not read it
539 current->set_exception_pc(nullptr);
540 #endif // INCLUDE_JVMCI
541
542 if (Continuation::is_return_barrier_entry(return_address)) {
543 return StubRoutines::cont_returnBarrierExc();
544 }
545
546 // The fastest case first
547 CodeBlob* blob = CodeCache::find_blob(return_address);
548 nmethod* nm = (blob != nullptr) ? blob->as_nmethod_or_null() : nullptr;
549 if (nm != nullptr) {
550 // Set flag if return address is a method handle call site.
551 current->set_is_method_handle_return(nm->is_method_handle_return(return_address));
552 // native nmethods don't have exception handlers
553 assert(!nm->is_native_method() || nm->method()->is_continuation_enter_intrinsic(), "no exception handler");
554 assert(nm->header_begin() != nm->exception_begin(), "no exception handler");
555 if (nm->is_deopt_pc(return_address)) {
556 // If we come here because of a stack overflow, the stack may be
557 // unguarded. Reguard the stack otherwise if we return to the
558 // deopt blob and the stack bang causes a stack overflow we
559 // crash.
560 StackOverflow* overflow_state = current->stack_overflow_state();
561 bool guard_pages_enabled = overflow_state->reguard_stack_if_needed();
562 if (overflow_state->reserved_stack_activation() != current->stack_base()) {
563 overflow_state->set_reserved_stack_activation(current->stack_base());
564 }
565 assert(guard_pages_enabled, "stack banging in deopt blob may cause crash");
566 // The deferred StackWatermarkSet::after_unwind check will be performed in
567 // Deoptimization::fetch_unroll_info (with exec_mode == Unpack_exception)
568 return SharedRuntime::deopt_blob()->unpack_with_exception();
569 } else {
570 // The deferred StackWatermarkSet::after_unwind check will be performed in
571 // * OptoRuntime::handle_exception_C_helper for C2 code
572 // * exception_handler_for_pc_helper via Runtime1::handle_exception_from_callee_id for C1 code
573 return nm->exception_begin();
574 }
575 }
576
577 // Entry code
578 if (StubRoutines::returns_to_call_stub(return_address)) {
579 // The deferred StackWatermarkSet::after_unwind check will be performed in
580 // JavaCallWrapper::~JavaCallWrapper
581 assert (StubRoutines::catch_exception_entry() != nullptr, "must be generated before");
582 return StubRoutines::catch_exception_entry();
583 }
584 if (blob != nullptr && blob->is_upcall_stub()) {
585 return StubRoutines::upcall_stub_exception_handler();
586 }
587 // Interpreted code
588 if (Interpreter::contains(return_address)) {
589 // The deferred StackWatermarkSet::after_unwind check will be performed in
590 // InterpreterRuntime::exception_handler_for_exception
591 return Interpreter::rethrow_exception_entry();
592 }
593
594 guarantee(blob == nullptr || !blob->is_runtime_stub(), "caller should have skipped stub");
595 guarantee(!VtableStubs::contains(return_address), "null exceptions in vtables should have been handled already!");
596
597 #ifndef PRODUCT
598 { ResourceMark rm;
599 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", p2i(return_address));
600 os::print_location(tty, (intptr_t)return_address);
601 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here");
602 tty->print_cr("b) other problem");
603 }
604 #endif // PRODUCT
605 ShouldNotReachHere();
606 return nullptr;
607 }
608
609
610 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* current, address return_address))
611 return raw_exception_handler_for_return_address(current, return_address);
612 JRT_END
613
614
615 address SharedRuntime::get_poll_stub(address pc) {
616 address stub;
617 // Look up the code blob
618 CodeBlob *cb = CodeCache::find_blob(pc);
619
620 // Should be an nmethod
621 guarantee(cb != nullptr && cb->is_nmethod(), "safepoint polling: pc must refer to an nmethod");
622
623 // Look up the relocation information
624 assert(cb->as_nmethod()->is_at_poll_or_poll_return(pc),
625 "safepoint polling: type must be poll at pc " INTPTR_FORMAT, p2i(pc));
626
627 #ifdef ASSERT
628 if (!((NativeInstruction*)pc)->is_safepoint_poll()) {
629 tty->print_cr("bad pc: " PTR_FORMAT, p2i(pc));
630 Disassembler::decode(cb);
631 fatal("Only polling locations are used for safepoint");
632 }
633 #endif
634
635 bool at_poll_return = cb->as_nmethod()->is_at_poll_return(pc);
636 bool has_wide_vectors = cb->as_nmethod()->has_wide_vectors();
637 if (at_poll_return) {
638 assert(SharedRuntime::polling_page_return_handler_blob() != nullptr,
639 "polling page return stub not created yet");
640 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();
641 } else if (has_wide_vectors) {
642 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != nullptr,
643 "polling page vectors safepoint stub not created yet");
644 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point();
645 } else {
646 assert(SharedRuntime::polling_page_safepoint_handler_blob() != nullptr,
647 "polling page safepoint stub not created yet");
648 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point();
649 }
650 log_debug(safepoint)("... found polling page %s exception at pc = "
651 INTPTR_FORMAT ", stub =" INTPTR_FORMAT,
652 at_poll_return ? "return" : "loop",
653 (intptr_t)pc, (intptr_t)stub);
654 return stub;
655 }
656
657 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread* current, Handle h_exception) {
658 if (JvmtiExport::can_post_on_exceptions()) {
659 vframeStream vfst(current, true);
660 methodHandle method = methodHandle(current, vfst.method());
661 address bcp = method()->bcp_from(vfst.bci());
662 JvmtiExport::post_exception_throw(current, method(), bcp, h_exception());
663 }
664
665 #if INCLUDE_JVMCI
666 if (EnableJVMCI) {
667 vframeStream vfst(current, true);
668 methodHandle method = methodHandle(current, vfst.method());
669 int bci = vfst.bci();
670 MethodData* trap_mdo = method->method_data();
671 if (trap_mdo != nullptr) {
672 // Set exception_seen if the exceptional bytecode is an invoke
673 Bytecode_invoke call = Bytecode_invoke_check(method, bci);
674 if (call.is_valid()) {
675 ResourceMark rm(current);
676
677 // Lock to read ProfileData, and ensure lock is not broken by a safepoint
678 MutexLocker ml(trap_mdo->extra_data_lock(), Mutex::_no_safepoint_check_flag);
679
680 ProfileData* pdata = trap_mdo->allocate_bci_to_data(bci, nullptr);
681 if (pdata != nullptr && pdata->is_BitData()) {
682 BitData* bit_data = (BitData*) pdata;
683 bit_data->set_exception_seen();
684 }
685 }
686 }
687 }
688 #endif
689
690 Exceptions::_throw(current, __FILE__, __LINE__, h_exception);
691 }
692
693 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread* current, Symbol* name, const char *message) {
694 Handle h_exception = Exceptions::new_exception(current, name, message);
695 throw_and_post_jvmti_exception(current, h_exception);
696 }
697
698 #if INCLUDE_JVMTI
699 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_start(oopDesc* vt, jboolean hide, JavaThread* current))
700 assert(hide == JNI_FALSE, "must be VTMS transition finish");
701 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
702 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
703 JNIHandles::destroy_local(vthread);
704 JRT_END
705
706 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_end(oopDesc* vt, jboolean hide, JavaThread* current))
707 assert(hide == JNI_TRUE, "must be VTMS transition start");
708 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
709 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
710 JNIHandles::destroy_local(vthread);
711 JRT_END
712
713 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_mount(oopDesc* vt, jboolean hide, JavaThread* current))
714 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
715 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
716 JNIHandles::destroy_local(vthread);
717 JRT_END
718
719 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_unmount(oopDesc* vt, jboolean hide, JavaThread* current))
720 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
721 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
722 JNIHandles::destroy_local(vthread);
723 JRT_END
724 #endif // INCLUDE_JVMTI
725
726 // The interpreter code to call this tracing function is only
727 // called/generated when UL is on for redefine, class and has the right level
728 // and tags. Since obsolete methods are never compiled, we don't have
729 // to modify the compilers to generate calls to this function.
730 //
731 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry(
732 JavaThread* thread, Method* method))
733 if (method->is_obsolete()) {
734 // We are calling an obsolete method, but this is not necessarily
735 // an error. Our method could have been redefined just after we
736 // fetched the Method* from the constant pool.
737 ResourceMark rm;
738 log_trace(redefine, class, obsolete)("calling obsolete method '%s'", method->name_and_sig_as_C_string());
739 }
740 return 0;
741 JRT_END
742
743 // ret_pc points into caller; we are returning caller's exception handler
744 // for given exception
745 // Note that the implementation of this method assumes it's only called when an exception has actually occured
746 address SharedRuntime::compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
747 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred) {
748 assert(nm != nullptr, "must exist");
749 ResourceMark rm;
750
751 #if INCLUDE_JVMCI
752 if (nm->is_compiled_by_jvmci()) {
753 // lookup exception handler for this pc
754 int catch_pco = pointer_delta_as_int(ret_pc, nm->code_begin());
755 ExceptionHandlerTable table(nm);
756 HandlerTableEntry *t = table.entry_for(catch_pco, -1, 0);
757 if (t != nullptr) {
758 return nm->code_begin() + t->pco();
759 } else {
760 return Deoptimization::deoptimize_for_missing_exception_handler(nm);
761 }
762 }
763 #endif // INCLUDE_JVMCI
764
765 ScopeDesc* sd = nm->scope_desc_at(ret_pc);
766 // determine handler bci, if any
767 EXCEPTION_MARK;
768
769 int handler_bci = -1;
770 int scope_depth = 0;
771 if (!force_unwind) {
772 int bci = sd->bci();
773 bool recursive_exception = false;
774 do {
775 bool skip_scope_increment = false;
776 // exception handler lookup
777 Klass* ek = exception->klass();
778 methodHandle mh(THREAD, sd->method());
779 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD);
780 if (HAS_PENDING_EXCEPTION) {
781 recursive_exception = true;
782 // We threw an exception while trying to find the exception handler.
783 // Transfer the new exception to the exception handle which will
784 // be set into thread local storage, and do another lookup for an
785 // exception handler for this exception, this time starting at the
786 // BCI of the exception handler which caused the exception to be
787 // thrown (bugs 4307310 and 4546590). Set "exception" reference
788 // argument to ensure that the correct exception is thrown (4870175).
789 recursive_exception_occurred = true;
790 exception = Handle(THREAD, PENDING_EXCEPTION);
791 CLEAR_PENDING_EXCEPTION;
792 if (handler_bci >= 0) {
793 bci = handler_bci;
794 handler_bci = -1;
795 skip_scope_increment = true;
796 }
797 }
798 else {
799 recursive_exception = false;
800 }
801 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) {
802 sd = sd->sender();
803 if (sd != nullptr) {
804 bci = sd->bci();
805 }
806 ++scope_depth;
807 }
808 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != nullptr));
809 }
810
811 // found handling method => lookup exception handler
812 int catch_pco = pointer_delta_as_int(ret_pc, nm->code_begin());
813
814 ExceptionHandlerTable table(nm);
815 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth);
816 if (t == nullptr && (nm->is_compiled_by_c1() || handler_bci != -1)) {
817 // Allow abbreviated catch tables. The idea is to allow a method
818 // to materialize its exceptions without committing to the exact
819 // routing of exceptions. In particular this is needed for adding
820 // a synthetic handler to unlock monitors when inlining
821 // synchronized methods since the unlock path isn't represented in
822 // the bytecodes.
823 t = table.entry_for(catch_pco, -1, 0);
824 }
825
826 #ifdef COMPILER1
827 if (t == nullptr && nm->is_compiled_by_c1()) {
828 assert(nm->unwind_handler_begin() != nullptr, "");
829 return nm->unwind_handler_begin();
830 }
831 #endif
832
833 if (t == nullptr) {
834 ttyLocker ttyl;
835 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d, catch_pco: %d", p2i(ret_pc), handler_bci, catch_pco);
836 tty->print_cr(" Exception:");
837 exception->print();
838 tty->cr();
839 tty->print_cr(" Compiled exception table :");
840 table.print();
841 nm->print();
842 nm->print_code();
843 guarantee(false, "missing exception handler");
844 return nullptr;
845 }
846
847 if (handler_bci != -1) { // did we find a handler in this method?
848 sd->method()->set_exception_handler_entered(handler_bci); // profile
849 }
850 return nm->code_begin() + t->pco();
851 }
852
853 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* current))
854 // These errors occur only at call sites
855 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_AbstractMethodError());
856 JRT_END
857
858 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
859 // These errors occur only at call sites
860 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub");
861 JRT_END
862
863 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* current))
864 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
865 JRT_END
866
867 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* current))
868 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_NullPointerException(), nullptr);
869 JRT_END
870
871 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* current))
872 // This entry point is effectively only used for NullPointerExceptions which occur at inline
873 // cache sites (when the callee activation is not yet set up) so we are at a call site
874 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_NullPointerException(), nullptr);
875 JRT_END
876
877 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* current))
878 throw_StackOverflowError_common(current, false);
879 JRT_END
880
881 JRT_ENTRY(void, SharedRuntime::throw_delayed_StackOverflowError(JavaThread* current))
882 throw_StackOverflowError_common(current, true);
883 JRT_END
884
885 void SharedRuntime::throw_StackOverflowError_common(JavaThread* current, bool delayed) {
886 // We avoid using the normal exception construction in this case because
887 // it performs an upcall to Java, and we're already out of stack space.
888 JavaThread* THREAD = current; // For exception macros.
889 Klass* k = vmClasses::StackOverflowError_klass();
890 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK);
891 if (delayed) {
892 java_lang_Throwable::set_message(exception_oop,
893 Universe::delayed_stack_overflow_error_message());
894 }
895 Handle exception (current, exception_oop);
896 if (StackTraceInThrowable) {
897 java_lang_Throwable::fill_in_stack_trace(exception);
898 }
899 // Remove the ScopedValue bindings in case we got a
900 // StackOverflowError while we were trying to remove ScopedValue
901 // bindings.
902 current->clear_scopedValueBindings();
903 // Increment counter for hs_err file reporting
904 Atomic::inc(&Exceptions::_stack_overflow_errors);
905 throw_and_post_jvmti_exception(current, exception);
906 }
907
908 address SharedRuntime::continuation_for_implicit_exception(JavaThread* current,
909 address pc,
910 ImplicitExceptionKind exception_kind)
911 {
912 address target_pc = nullptr;
913
914 if (Interpreter::contains(pc)) {
915 switch (exception_kind) {
916 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry();
917 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry();
918 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry();
919 default: ShouldNotReachHere();
920 }
921 } else {
922 switch (exception_kind) {
923 case STACK_OVERFLOW: {
924 // Stack overflow only occurs upon frame setup; the callee is
925 // going to be unwound. Dispatch to a shared runtime stub
926 // which will cause the StackOverflowError to be fabricated
927 // and processed.
928 // Stack overflow should never occur during deoptimization:
929 // the compiled method bangs the stack by as much as the
930 // interpreter would need in case of a deoptimization. The
931 // deoptimization blob and uncommon trap blob bang the stack
932 // in a debug VM to verify the correctness of the compiled
933 // method stack banging.
934 assert(current->deopt_mark() == nullptr, "no stack overflow from deopt blob/uncommon trap");
935 Events::log_exception(current, "StackOverflowError at " INTPTR_FORMAT, p2i(pc));
936 return SharedRuntime::throw_StackOverflowError_entry();
937 }
938
939 case IMPLICIT_NULL: {
940 if (VtableStubs::contains(pc)) {
941 // We haven't yet entered the callee frame. Fabricate an
942 // exception and begin dispatching it in the caller. Since
943 // the caller was at a call site, it's safe to destroy all
944 // caller-saved registers, as these entry points do.
945 VtableStub* vt_stub = VtableStubs::stub_containing(pc);
946
947 // If vt_stub is null, then return null to signal handler to report the SEGV error.
948 if (vt_stub == nullptr) return nullptr;
949
950 if (vt_stub->is_abstract_method_error(pc)) {
951 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs");
952 Events::log_exception(current, "AbstractMethodError at " INTPTR_FORMAT, p2i(pc));
953 // Instead of throwing the abstract method error here directly, we re-resolve
954 // and will throw the AbstractMethodError during resolve. As a result, we'll
955 // get a more detailed error message.
956 return SharedRuntime::get_handle_wrong_method_stub();
957 } else {
958 Events::log_exception(current, "NullPointerException at vtable entry " INTPTR_FORMAT, p2i(pc));
959 // Assert that the signal comes from the expected location in stub code.
960 assert(vt_stub->is_null_pointer_exception(pc),
961 "obtained signal from unexpected location in stub code");
962 return SharedRuntime::throw_NullPointerException_at_call_entry();
963 }
964 } else {
965 CodeBlob* cb = CodeCache::find_blob(pc);
966
967 // If code blob is null, then return null to signal handler to report the SEGV error.
968 if (cb == nullptr) return nullptr;
969
970 // Exception happened in CodeCache. Must be either:
971 // 1. Inline-cache check in C2I handler blob,
972 // 2. Inline-cache check in nmethod, or
973 // 3. Implicit null exception in nmethod
974
975 if (!cb->is_nmethod()) {
976 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob();
977 if (!is_in_blob) {
978 // Allow normal crash reporting to handle this
979 return nullptr;
980 }
981 Events::log_exception(current, "NullPointerException in code blob at " INTPTR_FORMAT, p2i(pc));
982 // There is no handler here, so we will simply unwind.
983 return SharedRuntime::throw_NullPointerException_at_call_entry();
984 }
985
986 // Otherwise, it's a compiled method. Consult its exception handlers.
987 nmethod* nm = cb->as_nmethod();
988 if (nm->inlinecache_check_contains(pc)) {
989 // exception happened inside inline-cache check code
990 // => the nmethod is not yet active (i.e., the frame
991 // is not set up yet) => use return address pushed by
992 // caller => don't push another return address
993 Events::log_exception(current, "NullPointerException in IC check " INTPTR_FORMAT, p2i(pc));
994 return SharedRuntime::throw_NullPointerException_at_call_entry();
995 }
996
997 if (nm->method()->is_method_handle_intrinsic()) {
998 // exception happened inside MH dispatch code, similar to a vtable stub
999 Events::log_exception(current, "NullPointerException in MH adapter " INTPTR_FORMAT, p2i(pc));
1000 return SharedRuntime::throw_NullPointerException_at_call_entry();
1001 }
1002
1003 #ifndef PRODUCT
1004 _implicit_null_throws++;
1005 #endif
1006 target_pc = nm->continuation_for_implicit_null_exception(pc);
1007 // If there's an unexpected fault, target_pc might be null,
1008 // in which case we want to fall through into the normal
1009 // error handling code.
1010 }
1011
1012 break; // fall through
1013 }
1014
1015
1016 case IMPLICIT_DIVIDE_BY_ZERO: {
1017 nmethod* nm = CodeCache::find_nmethod(pc);
1018 guarantee(nm != nullptr, "must have containing compiled method for implicit division-by-zero exceptions");
1019 #ifndef PRODUCT
1020 _implicit_div0_throws++;
1021 #endif
1022 target_pc = nm->continuation_for_implicit_div0_exception(pc);
1023 // If there's an unexpected fault, target_pc might be null,
1024 // in which case we want to fall through into the normal
1025 // error handling code.
1026 break; // fall through
1027 }
1028
1029 default: ShouldNotReachHere();
1030 }
1031
1032 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind");
1033
1034 if (exception_kind == IMPLICIT_NULL) {
1035 #ifndef PRODUCT
1036 // for AbortVMOnException flag
1037 Exceptions::debug_check_abort("java.lang.NullPointerException");
1038 #endif //PRODUCT
1039 Events::log_exception(current, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
1040 } else {
1041 #ifndef PRODUCT
1042 // for AbortVMOnException flag
1043 Exceptions::debug_check_abort("java.lang.ArithmeticException");
1044 #endif //PRODUCT
1045 Events::log_exception(current, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
1046 }
1047 return target_pc;
1048 }
1049
1050 ShouldNotReachHere();
1051 return nullptr;
1052 }
1053
1054
1055 /**
1056 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is
1057 * installed in the native function entry of all native Java methods before
1058 * they get linked to their actual native methods.
1059 *
1060 * \note
1061 * This method actually never gets called! The reason is because
1062 * the interpreter's native entries call NativeLookup::lookup() which
1063 * throws the exception when the lookup fails. The exception is then
1064 * caught and forwarded on the return from NativeLookup::lookup() call
1065 * before the call to the native function. This might change in the future.
1066 */
1067 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...))
1068 {
1069 // We return a bad value here to make sure that the exception is
1070 // forwarded before we look at the return value.
1071 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badAddress);
1072 }
1073 JNI_END
1074
1075 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
1076 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
1077 }
1078
1079 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
1080 #if INCLUDE_JVMCI
1081 if (!obj->klass()->has_finalizer()) {
1082 return;
1083 }
1084 #endif // INCLUDE_JVMCI
1085 assert(oopDesc::is_oop(obj), "must be a valid oop");
1086 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
1087 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
1088 JRT_END
1089
1090 jlong SharedRuntime::get_java_tid(JavaThread* thread) {
1091 assert(thread != nullptr, "No thread");
1092 if (thread == nullptr) {
1093 return 0;
1094 }
1095 guarantee(Thread::current() != thread || thread->is_oop_safe(),
1096 "current cannot touch oops after its GC barrier is detached.");
1097 oop obj = thread->threadObj();
1098 return (obj == nullptr) ? 0 : java_lang_Thread::thread_id(obj);
1099 }
1100
1101 /**
1102 * This function ought to be a void function, but cannot be because
1103 * it gets turned into a tail-call on sparc, which runs into dtrace bug
1104 * 6254741. Once that is fixed we can remove the dummy return value.
1105 */
1106 int SharedRuntime::dtrace_object_alloc(oopDesc* o) {
1107 return dtrace_object_alloc(JavaThread::current(), o, o->size());
1108 }
1109
1110 int SharedRuntime::dtrace_object_alloc(JavaThread* thread, oopDesc* o) {
1111 return dtrace_object_alloc(thread, o, o->size());
1112 }
1113
1114 int SharedRuntime::dtrace_object_alloc(JavaThread* thread, oopDesc* o, size_t size) {
1115 assert(DTraceAllocProbes, "wrong call");
1116 Klass* klass = o->klass();
1117 Symbol* name = klass->name();
1118 HOTSPOT_OBJECT_ALLOC(
1119 get_java_tid(thread),
1120 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize);
1121 return 0;
1122 }
1123
1124 JRT_LEAF(int, SharedRuntime::dtrace_method_entry(
1125 JavaThread* current, Method* method))
1126 assert(current == JavaThread::current(), "pre-condition");
1127
1128 assert(DTraceMethodProbes, "wrong call");
1129 Symbol* kname = method->klass_name();
1130 Symbol* name = method->name();
1131 Symbol* sig = method->signature();
1132 HOTSPOT_METHOD_ENTRY(
1133 get_java_tid(current),
1134 (char *) kname->bytes(), kname->utf8_length(),
1135 (char *) name->bytes(), name->utf8_length(),
1136 (char *) sig->bytes(), sig->utf8_length());
1137 return 0;
1138 JRT_END
1139
1140 JRT_LEAF(int, SharedRuntime::dtrace_method_exit(
1141 JavaThread* current, Method* method))
1142 assert(current == JavaThread::current(), "pre-condition");
1143 assert(DTraceMethodProbes, "wrong call");
1144 Symbol* kname = method->klass_name();
1145 Symbol* name = method->name();
1146 Symbol* sig = method->signature();
1147 HOTSPOT_METHOD_RETURN(
1148 get_java_tid(current),
1149 (char *) kname->bytes(), kname->utf8_length(),
1150 (char *) name->bytes(), name->utf8_length(),
1151 (char *) sig->bytes(), sig->utf8_length());
1152 return 0;
1153 JRT_END
1154
1155
1156 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode)
1157 // for a call current in progress, i.e., arguments has been pushed on stack
1158 // put callee has not been invoked yet. Used by: resolve virtual/static,
1159 // vtable updates, etc. Caller frame must be compiled.
1160 Handle SharedRuntime::find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) {
1161 JavaThread* current = THREAD;
1162 ResourceMark rm(current);
1163
1164 // last java frame on stack (which includes native call frames)
1165 vframeStream vfst(current, true); // Do not skip and javaCalls
1166
1167 return find_callee_info_helper(vfst, bc, callinfo, THREAD);
1168 }
1169
1170 Method* SharedRuntime::extract_attached_method(vframeStream& vfst) {
1171 nmethod* caller = vfst.nm();
1172
1173 address pc = vfst.frame_pc();
1174 { // Get call instruction under lock because another thread may be busy patching it.
1175 CompiledICLocker ic_locker(caller);
1176 return caller->attached_method_before_pc(pc);
1177 }
1178 return nullptr;
1179 }
1180
1181 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
1182 // for a call current in progress, i.e., arguments has been pushed on stack
1183 // but callee has not been invoked yet. Caller frame must be compiled.
1184 Handle SharedRuntime::find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc,
1185 CallInfo& callinfo, TRAPS) {
1186 Handle receiver;
1187 Handle nullHandle; // create a handy null handle for exception returns
1188 JavaThread* current = THREAD;
1189
1190 assert(!vfst.at_end(), "Java frame must exist");
1191
1192 // Find caller and bci from vframe
1193 methodHandle caller(current, vfst.method());
1194 int bci = vfst.bci();
1195
1196 if (caller->is_continuation_enter_intrinsic()) {
1197 bc = Bytecodes::_invokestatic;
1198 LinkResolver::resolve_continuation_enter(callinfo, CHECK_NH);
1199 return receiver;
1200 }
1201
1202 // Substitutability test implementation piggy backs on static call resolution
1203 Bytecodes::Code code = caller->java_code_at(bci);
1204 if (code == Bytecodes::_if_acmpeq || code == Bytecodes::_if_acmpne) {
1205 bc = Bytecodes::_invokestatic;
1206 methodHandle attached_method(THREAD, extract_attached_method(vfst));
1207 assert(attached_method.not_null(), "must have attached method");
1208 vmClasses::ValueObjectMethods_klass()->initialize(CHECK_NH);
1209 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, false, CHECK_NH);
1210 #ifdef ASSERT
1211 Method* is_subst = vmClasses::ValueObjectMethods_klass()->find_method(vmSymbols::isSubstitutable_name(), vmSymbols::object_object_boolean_signature());
1212 assert(callinfo.selected_method() == is_subst, "must be isSubstitutable method");
1213 #endif
1214 return receiver;
1215 }
1216
1217 Bytecode_invoke bytecode(caller, bci);
1218 int bytecode_index = bytecode.index();
1219 bc = bytecode.invoke_code();
1220
1221 methodHandle attached_method(current, extract_attached_method(vfst));
1222 if (attached_method.not_null()) {
1223 Method* callee = bytecode.static_target(CHECK_NH);
1224 vmIntrinsics::ID id = callee->intrinsic_id();
1225 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call,
1226 // it attaches statically resolved method to the call site.
1227 if (MethodHandles::is_signature_polymorphic(id) &&
1228 MethodHandles::is_signature_polymorphic_intrinsic(id)) {
1229 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id);
1230
1231 // Adjust invocation mode according to the attached method.
1232 switch (bc) {
1233 case Bytecodes::_invokevirtual:
1234 if (attached_method->method_holder()->is_interface()) {
1235 bc = Bytecodes::_invokeinterface;
1236 }
1237 break;
1238 case Bytecodes::_invokeinterface:
1239 if (!attached_method->method_holder()->is_interface()) {
1240 bc = Bytecodes::_invokevirtual;
1241 }
1242 break;
1243 case Bytecodes::_invokehandle:
1244 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) {
1245 bc = attached_method->is_static() ? Bytecodes::_invokestatic
1246 : Bytecodes::_invokevirtual;
1247 }
1248 break;
1249 default:
1250 break;
1251 }
1252 } else {
1253 assert(attached_method->has_scalarized_args(), "invalid use of attached method");
1254 if (!attached_method->method_holder()->is_inline_klass()) {
1255 // Ignore the attached method in this case to not confuse below code
1256 attached_method = methodHandle(current, nullptr);
1257 }
1258 }
1259 }
1260
1261 assert(bc != Bytecodes::_illegal, "not initialized");
1262
1263 bool has_receiver = bc != Bytecodes::_invokestatic &&
1264 bc != Bytecodes::_invokedynamic &&
1265 bc != Bytecodes::_invokehandle;
1266 bool check_null_and_abstract = true;
1267
1268 // Find receiver for non-static call
1269 if (has_receiver) {
1270 // This register map must be update since we need to find the receiver for
1271 // compiled frames. The receiver might be in a register.
1272 RegisterMap reg_map2(current,
1273 RegisterMap::UpdateMap::include,
1274 RegisterMap::ProcessFrames::include,
1275 RegisterMap::WalkContinuation::skip);
1276 frame stubFrame = current->last_frame();
1277 // Caller-frame is a compiled frame
1278 frame callerFrame = stubFrame.sender(®_map2);
1279
1280 Method* callee = attached_method();
1281 if (callee == nullptr) {
1282 callee = bytecode.static_target(CHECK_NH);
1283 if (callee == nullptr) {
1284 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1285 }
1286 }
1287 bool caller_is_c1 = callerFrame.is_compiled_frame() && callerFrame.cb()->as_nmethod()->is_compiled_by_c1();
1288 if (!caller_is_c1 && callee->is_scalarized_arg(0)) {
1289 // If the receiver is an inline type that is passed as fields, no oop is available
1290 // Resolve the call without receiver null checking.
1291 assert(!callee->mismatch(), "calls with inline type receivers should never mismatch");
1292 assert(attached_method.not_null() && !attached_method->is_abstract(), "must have non-abstract attached method");
1293 if (bc == Bytecodes::_invokeinterface) {
1294 bc = Bytecodes::_invokevirtual; // C2 optimistically replaces interface calls by virtual calls
1295 }
1296 check_null_and_abstract = false;
1297 } else {
1298 // Retrieve from a compiled argument list
1299 receiver = Handle(current, callerFrame.retrieve_receiver(®_map2));
1300 assert(oopDesc::is_oop_or_null(receiver()), "");
1301 if (receiver.is_null()) {
1302 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1303 }
1304 }
1305 }
1306
1307 // Resolve method
1308 if (attached_method.not_null()) {
1309 // Parameterized by attached method.
1310 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, check_null_and_abstract, CHECK_NH);
1311 } else {
1312 // Parameterized by bytecode.
1313 constantPoolHandle constants(current, caller->constants());
1314 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH);
1315 }
1316
1317 #ifdef ASSERT
1318 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1319 if (has_receiver && check_null_and_abstract) {
1320 assert(receiver.not_null(), "should have thrown exception");
1321 Klass* receiver_klass = receiver->klass();
1322 Klass* rk = nullptr;
1323 if (attached_method.not_null()) {
1324 // In case there's resolved method attached, use its holder during the check.
1325 rk = attached_method->method_holder();
1326 } else {
1327 // Klass is already loaded.
1328 constantPoolHandle constants(current, caller->constants());
1329 rk = constants->klass_ref_at(bytecode_index, bc, CHECK_NH);
1330 }
1331 Klass* static_receiver_klass = rk;
1332 assert(receiver_klass->is_subtype_of(static_receiver_klass),
1333 "actual receiver must be subclass of static receiver klass");
1334 if (receiver_klass->is_instance_klass()) {
1335 if (InstanceKlass::cast(receiver_klass)->is_not_initialized()) {
1336 tty->print_cr("ERROR: Klass not yet initialized!!");
1337 receiver_klass->print();
1338 }
1339 assert(!InstanceKlass::cast(receiver_klass)->is_not_initialized(), "receiver_klass must be initialized");
1340 }
1341 }
1342 #endif
1343
1344 return receiver;
1345 }
1346
1347 methodHandle SharedRuntime::find_callee_method(bool is_optimized, bool& caller_is_c1, TRAPS) {
1348 JavaThread* current = THREAD;
1349 ResourceMark rm(current);
1350 // We need first to check if any Java activations (compiled, interpreted)
1351 // exist on the stack since last JavaCall. If not, we need
1352 // to get the target method from the JavaCall wrapper.
1353 vframeStream vfst(current, true); // Do not skip any javaCalls
1354 methodHandle callee_method;
1355 if (vfst.at_end()) {
1356 // No Java frames were found on stack since we did the JavaCall.
1357 // Hence the stack can only contain an entry_frame. We need to
1358 // find the target method from the stub frame.
1359 RegisterMap reg_map(current,
1360 RegisterMap::UpdateMap::skip,
1361 RegisterMap::ProcessFrames::include,
1362 RegisterMap::WalkContinuation::skip);
1363 frame fr = current->last_frame();
1364 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1365 fr = fr.sender(®_map);
1366 assert(fr.is_entry_frame(), "must be");
1367 // fr is now pointing to the entry frame.
1368 callee_method = methodHandle(current, fr.entry_frame_call_wrapper()->callee_method());
1369 } else {
1370 Bytecodes::Code bc;
1371 CallInfo callinfo;
1372 find_callee_info_helper(vfst, bc, callinfo, CHECK_(methodHandle()));
1373 // Calls via mismatching methods are always non-scalarized
1374 if (callinfo.resolved_method()->mismatch() && !is_optimized) {
1375 caller_is_c1 = true;
1376 }
1377 callee_method = methodHandle(current, callinfo.selected_method());
1378 }
1379 assert(callee_method()->is_method(), "must be");
1380 return callee_method;
1381 }
1382
1383 // Resolves a call.
1384 methodHandle SharedRuntime::resolve_helper(bool is_virtual, bool is_optimized, bool& caller_is_c1, TRAPS) {
1385 JavaThread* current = THREAD;
1386 ResourceMark rm(current);
1387 RegisterMap cbl_map(current,
1388 RegisterMap::UpdateMap::skip,
1389 RegisterMap::ProcessFrames::include,
1390 RegisterMap::WalkContinuation::skip);
1391 frame caller_frame = current->last_frame().sender(&cbl_map);
1392
1393 CodeBlob* caller_cb = caller_frame.cb();
1394 guarantee(caller_cb != nullptr && caller_cb->is_nmethod(), "must be called from compiled method");
1395 nmethod* caller_nm = caller_cb->as_nmethod();
1396
1397 // determine call info & receiver
1398 // note: a) receiver is null for static calls
1399 // b) an exception is thrown if receiver is null for non-static calls
1400 CallInfo call_info;
1401 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1402 Handle receiver = find_callee_info(invoke_code, call_info, CHECK_(methodHandle()));
1403
1404 NoSafepointVerifier nsv;
1405
1406 methodHandle callee_method(current, call_info.selected_method());
1407 // Calls via mismatching methods are always non-scalarized
1408 if (caller_nm->is_compiled_by_c1() || (call_info.resolved_method()->mismatch() && !is_optimized)) {
1409 caller_is_c1 = true;
1410 }
1411
1412 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1413 (!is_virtual && invoke_code == Bytecodes::_invokespecial) ||
1414 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1415 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1416 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1417
1418 assert(!caller_nm->is_unloading(), "It should not be unloading");
1419
1420 #ifndef PRODUCT
1421 // tracing/debugging/statistics
1422 uint *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
1423 (is_virtual) ? (&_resolve_virtual_ctr) :
1424 (&_resolve_static_ctr);
1425 Atomic::inc(addr);
1426
1427 if (TraceCallFixup) {
1428 ResourceMark rm(current);
1429 tty->print("resolving %s%s (%s) call%s to",
1430 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
1431 Bytecodes::name(invoke_code), (caller_is_c1) ? " from C1" : "");
1432 callee_method->print_short_name(tty);
1433 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT,
1434 p2i(caller_frame.pc()), p2i(callee_method->code()));
1435 }
1436 #endif
1437
1438 if (invoke_code == Bytecodes::_invokestatic) {
1439 assert(callee_method->method_holder()->is_initialized() ||
1440 callee_method->method_holder()->is_reentrant_initialization(current),
1441 "invalid class initialization state for invoke_static");
1442 if (!VM_Version::supports_fast_class_init_checks() && callee_method->needs_clinit_barrier()) {
1443 // In order to keep class initialization check, do not patch call
1444 // site for static call when the class is not fully initialized.
1445 // Proper check is enforced by call site re-resolution on every invocation.
1446 //
1447 // When fast class initialization checks are supported (VM_Version::supports_fast_class_init_checks() == true),
1448 // explicit class initialization check is put in nmethod entry (VEP).
1449 assert(callee_method->method_holder()->is_linked(), "must be");
1450 return callee_method;
1451 }
1452 }
1453
1454
1455 // JSR 292 key invariant:
1456 // If the resolved method is a MethodHandle invoke target, the call
1457 // site must be a MethodHandle call site, because the lambda form might tail-call
1458 // leaving the stack in a state unknown to either caller or callee
1459
1460 // Compute entry points. The computation of the entry points is independent of
1461 // patching the call.
1462
1463 // Make sure the callee nmethod does not get deoptimized and removed before
1464 // we are done patching the code.
1465
1466
1467 CompiledICLocker ml(caller_nm);
1468 if (is_virtual && !is_optimized) {
1469 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1470 inline_cache->update(&call_info, receiver->klass(), caller_is_c1);
1471 } else {
1472 // Callsite is a direct call - set it to the destination method
1473 CompiledDirectCall* callsite = CompiledDirectCall::before(caller_frame.pc());
1474 callsite->set(callee_method, caller_is_c1);
1475 }
1476
1477 return callee_method;
1478 }
1479
1480 // Inline caches exist only in compiled code
1481 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* current))
1482 #ifdef ASSERT
1483 RegisterMap reg_map(current,
1484 RegisterMap::UpdateMap::skip,
1485 RegisterMap::ProcessFrames::include,
1486 RegisterMap::WalkContinuation::skip);
1487 frame stub_frame = current->last_frame();
1488 assert(stub_frame.is_runtime_frame(), "sanity check");
1489 frame caller_frame = stub_frame.sender(®_map);
1490 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame() && !caller_frame.is_upcall_stub_frame(), "unexpected frame");
1491 #endif /* ASSERT */
1492
1493 methodHandle callee_method;
1494 bool is_optimized = false;
1495 bool caller_is_c1 = false;
1496 JRT_BLOCK
1497 callee_method = SharedRuntime::handle_ic_miss_helper(is_optimized, caller_is_c1, CHECK_NULL);
1498 // Return Method* through TLS
1499 current->set_vm_result_metadata(callee_method());
1500 JRT_BLOCK_END
1501 // return compiled code entry point after potential safepoints
1502 return get_resolved_entry(current, callee_method, false, is_optimized, caller_is_c1);
1503 JRT_END
1504
1505
1506 // Handle call site that has been made non-entrant
1507 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* current))
1508 // 6243940 We might end up in here if the callee is deoptimized
1509 // as we race to call it. We don't want to take a safepoint if
1510 // the caller was interpreted because the caller frame will look
1511 // interpreted to the stack walkers and arguments are now
1512 // "compiled" so it is much better to make this transition
1513 // invisible to the stack walking code. The i2c path will
1514 // place the callee method in the callee_target. It is stashed
1515 // there because if we try and find the callee by normal means a
1516 // safepoint is possible and have trouble gc'ing the compiled args.
1517 RegisterMap reg_map(current,
1518 RegisterMap::UpdateMap::skip,
1519 RegisterMap::ProcessFrames::include,
1520 RegisterMap::WalkContinuation::skip);
1521 frame stub_frame = current->last_frame();
1522 assert(stub_frame.is_runtime_frame(), "sanity check");
1523 frame caller_frame = stub_frame.sender(®_map);
1524
1525 if (caller_frame.is_interpreted_frame() ||
1526 caller_frame.is_entry_frame() ||
1527 caller_frame.is_upcall_stub_frame()) {
1528 Method* callee = current->callee_target();
1529 guarantee(callee != nullptr && callee->is_method(), "bad handshake");
1530 current->set_vm_result_metadata(callee);
1531 current->set_callee_target(nullptr);
1532 if (caller_frame.is_entry_frame() && VM_Version::supports_fast_class_init_checks()) {
1533 // Bypass class initialization checks in c2i when caller is in native.
1534 // JNI calls to static methods don't have class initialization checks.
1535 // Fast class initialization checks are present in c2i adapters and call into
1536 // SharedRuntime::handle_wrong_method() on the slow path.
1537 //
1538 // JVM upcalls may land here as well, but there's a proper check present in
1539 // LinkResolver::resolve_static_call (called from JavaCalls::call_static),
1540 // so bypassing it in c2i adapter is benign.
1541 return callee->get_c2i_no_clinit_check_entry();
1542 } else {
1543 if (caller_frame.is_interpreted_frame()) {
1544 return callee->get_c2i_inline_entry();
1545 } else {
1546 return callee->get_c2i_entry();
1547 }
1548 }
1549 }
1550
1551 // Must be compiled to compiled path which is safe to stackwalk
1552 methodHandle callee_method;
1553 bool is_static_call = false;
1554 bool is_optimized = false;
1555 bool caller_is_c1 = false;
1556 JRT_BLOCK
1557 // Force resolving of caller (if we called from compiled frame)
1558 callee_method = SharedRuntime::reresolve_call_site(is_static_call, is_optimized, caller_is_c1, CHECK_NULL);
1559 current->set_vm_result_metadata(callee_method());
1560 JRT_BLOCK_END
1561 // return compiled code entry point after potential safepoints
1562 return get_resolved_entry(current, callee_method, is_static_call, is_optimized, caller_is_c1);
1563 JRT_END
1564
1565 // Handle abstract method call
1566 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* current))
1567 // Verbose error message for AbstractMethodError.
1568 // Get the called method from the invoke bytecode.
1569 vframeStream vfst(current, true);
1570 assert(!vfst.at_end(), "Java frame must exist");
1571 methodHandle caller(current, vfst.method());
1572 Bytecode_invoke invoke(caller, vfst.bci());
1573 DEBUG_ONLY( invoke.verify(); )
1574
1575 // Find the compiled caller frame.
1576 RegisterMap reg_map(current,
1577 RegisterMap::UpdateMap::include,
1578 RegisterMap::ProcessFrames::include,
1579 RegisterMap::WalkContinuation::skip);
1580 frame stubFrame = current->last_frame();
1581 assert(stubFrame.is_runtime_frame(), "must be");
1582 frame callerFrame = stubFrame.sender(®_map);
1583 assert(callerFrame.is_compiled_frame(), "must be");
1584
1585 // Install exception and return forward entry.
1586 address res = SharedRuntime::throw_AbstractMethodError_entry();
1587 JRT_BLOCK
1588 methodHandle callee(current, invoke.static_target(current));
1589 if (!callee.is_null()) {
1590 oop recv = callerFrame.retrieve_receiver(®_map);
1591 Klass *recv_klass = (recv != nullptr) ? recv->klass() : nullptr;
1592 res = StubRoutines::forward_exception_entry();
1593 LinkResolver::throw_abstract_method_error(callee, recv_klass, CHECK_(res));
1594 }
1595 JRT_BLOCK_END
1596 return res;
1597 JRT_END
1598
1599 // return verified_code_entry if interp_only_mode is not set for the current thread;
1600 // otherwise return c2i entry.
1601 address SharedRuntime::get_resolved_entry(JavaThread* current, methodHandle callee_method,
1602 bool is_static_call, bool is_optimized, bool caller_is_c1) {
1603 if (current->is_interp_only_mode() && !callee_method->is_special_native_intrinsic()) {
1604 // In interp_only_mode we need to go to the interpreted entry
1605 // The c2i won't patch in this mode -- see fixup_callers_callsite
1606 return callee_method->get_c2i_entry();
1607 }
1608
1609 if (caller_is_c1) {
1610 assert(callee_method->verified_inline_code_entry() != nullptr, "Jump to zero!");
1611 return callee_method->verified_inline_code_entry();
1612 } else if (is_static_call || is_optimized) {
1613 assert(callee_method->verified_code_entry() != nullptr, "Jump to zero!");
1614 return callee_method->verified_code_entry();
1615 } else {
1616 assert(callee_method->verified_inline_ro_code_entry() != nullptr, "Jump to zero!");
1617 return callee_method->verified_inline_ro_code_entry();
1618 }
1619 }
1620
1621 // resolve a static call and patch code
1622 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread* current ))
1623 methodHandle callee_method;
1624 bool caller_is_c1 = false;
1625 bool enter_special = false;
1626 JRT_BLOCK
1627 callee_method = SharedRuntime::resolve_helper(false, false, caller_is_c1, CHECK_NULL);
1628 current->set_vm_result_metadata(callee_method());
1629 JRT_BLOCK_END
1630 // return compiled code entry point after potential safepoints
1631 return get_resolved_entry(current, callee_method, true, false, caller_is_c1);
1632 JRT_END
1633
1634 // resolve virtual call and update inline cache to monomorphic
1635 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread* current))
1636 methodHandle callee_method;
1637 bool caller_is_c1 = false;
1638 JRT_BLOCK
1639 callee_method = SharedRuntime::resolve_helper(true, false, caller_is_c1, CHECK_NULL);
1640 current->set_vm_result_metadata(callee_method());
1641 JRT_BLOCK_END
1642 // return compiled code entry point after potential safepoints
1643 return get_resolved_entry(current, callee_method, false, false, caller_is_c1);
1644 JRT_END
1645
1646
1647 // Resolve a virtual call that can be statically bound (e.g., always
1648 // monomorphic, so it has no inline cache). Patch code to resolved target.
1649 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread* current))
1650 methodHandle callee_method;
1651 bool caller_is_c1 = false;
1652 JRT_BLOCK
1653 callee_method = SharedRuntime::resolve_helper(true, true, caller_is_c1, CHECK_NULL);
1654 current->set_vm_result_metadata(callee_method());
1655 JRT_BLOCK_END
1656 // return compiled code entry point after potential safepoints
1657 return get_resolved_entry(current, callee_method, false, true, caller_is_c1);
1658 JRT_END
1659
1660
1661
1662 methodHandle SharedRuntime::handle_ic_miss_helper(bool& is_optimized, bool& caller_is_c1, TRAPS) {
1663 JavaThread* current = THREAD;
1664 ResourceMark rm(current);
1665 CallInfo call_info;
1666 Bytecodes::Code bc;
1667
1668 // receiver is null for static calls. An exception is thrown for null
1669 // receivers for non-static calls
1670 Handle receiver = find_callee_info(bc, call_info, CHECK_(methodHandle()));
1671
1672 methodHandle callee_method(current, call_info.selected_method());
1673
1674 #ifndef PRODUCT
1675 Atomic::inc(&_ic_miss_ctr);
1676
1677 // Statistics & Tracing
1678 if (TraceCallFixup) {
1679 ResourceMark rm(current);
1680 tty->print("IC miss (%s) call%s to", Bytecodes::name(bc), (caller_is_c1) ? " from C1" : "");
1681 callee_method->print_short_name(tty);
1682 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1683 }
1684
1685 if (ICMissHistogram) {
1686 MutexLocker m(VMStatistic_lock);
1687 RegisterMap reg_map(current,
1688 RegisterMap::UpdateMap::skip,
1689 RegisterMap::ProcessFrames::include,
1690 RegisterMap::WalkContinuation::skip);
1691 frame f = current->last_frame().real_sender(®_map);// skip runtime stub
1692 // produce statistics under the lock
1693 trace_ic_miss(f.pc());
1694 }
1695 #endif
1696
1697 // install an event collector so that when a vtable stub is created the
1698 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1699 // event can't be posted when the stub is created as locks are held
1700 // - instead the event will be deferred until the event collector goes
1701 // out of scope.
1702 JvmtiDynamicCodeEventCollector event_collector;
1703
1704 // Update inline cache to megamorphic. Skip update if we are called from interpreted.
1705 RegisterMap reg_map(current,
1706 RegisterMap::UpdateMap::skip,
1707 RegisterMap::ProcessFrames::include,
1708 RegisterMap::WalkContinuation::skip);
1709 frame caller_frame = current->last_frame().sender(®_map);
1710 CodeBlob* cb = caller_frame.cb();
1711 nmethod* caller_nm = cb->as_nmethod();
1712 // Calls via mismatching methods are always non-scalarized
1713 if (caller_nm->is_compiled_by_c1() || call_info.resolved_method()->mismatch()) {
1714 caller_is_c1 = true;
1715 }
1716
1717 CompiledICLocker ml(caller_nm);
1718 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1719 inline_cache->update(&call_info, receiver()->klass(), caller_is_c1);
1720
1721 return callee_method;
1722 }
1723
1724 //
1725 // Resets a call-site in compiled code so it will get resolved again.
1726 // This routines handles both virtual call sites, optimized virtual call
1727 // sites, and static call sites. Typically used to change a call sites
1728 // destination from compiled to interpreted.
1729 //
1730 methodHandle SharedRuntime::reresolve_call_site(bool& is_static_call, bool& is_optimized, bool& caller_is_c1, TRAPS) {
1731 JavaThread* current = THREAD;
1732 ResourceMark rm(current);
1733 RegisterMap reg_map(current,
1734 RegisterMap::UpdateMap::skip,
1735 RegisterMap::ProcessFrames::include,
1736 RegisterMap::WalkContinuation::skip);
1737 frame stub_frame = current->last_frame();
1738 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1739 frame caller = stub_frame.sender(®_map);
1740 if (caller.is_compiled_frame()) {
1741 caller_is_c1 = caller.cb()->as_nmethod()->is_compiled_by_c1();
1742 }
1743
1744 // Do nothing if the frame isn't a live compiled frame.
1745 // nmethod could be deoptimized by the time we get here
1746 // so no update to the caller is needed.
1747
1748 if ((caller.is_compiled_frame() && !caller.is_deoptimized_frame()) ||
1749 (caller.is_native_frame() && caller.cb()->as_nmethod()->method()->is_continuation_enter_intrinsic())) {
1750
1751 address pc = caller.pc();
1752
1753 nmethod* caller_nm = CodeCache::find_nmethod(pc);
1754 assert(caller_nm != nullptr, "did not find caller nmethod");
1755
1756 // Default call_addr is the location of the "basic" call.
1757 // Determine the address of the call we a reresolving. With
1758 // Inline Caches we will always find a recognizable call.
1759 // With Inline Caches disabled we may or may not find a
1760 // recognizable call. We will always find a call for static
1761 // calls and for optimized virtual calls. For vanilla virtual
1762 // calls it depends on the state of the UseInlineCaches switch.
1763 //
1764 // With Inline Caches disabled we can get here for a virtual call
1765 // for two reasons:
1766 // 1 - calling an abstract method. The vtable for abstract methods
1767 // will run us thru handle_wrong_method and we will eventually
1768 // end up in the interpreter to throw the ame.
1769 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1770 // call and between the time we fetch the entry address and
1771 // we jump to it the target gets deoptimized. Similar to 1
1772 // we will wind up in the interprter (thru a c2i with c2).
1773 //
1774 CompiledICLocker ml(caller_nm);
1775 address call_addr = caller_nm->call_instruction_address(pc);
1776
1777 if (call_addr != nullptr) {
1778 // On x86 the logic for finding a call instruction is blindly checking for a call opcode 5
1779 // bytes back in the instruction stream so we must also check for reloc info.
1780 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1781 bool ret = iter.next(); // Get item
1782 if (ret) {
1783 is_static_call = false;
1784 is_optimized = false;
1785 switch (iter.type()) {
1786 case relocInfo::static_call_type:
1787 is_static_call = true;
1788 case relocInfo::opt_virtual_call_type: {
1789 is_optimized = (iter.type() == relocInfo::opt_virtual_call_type);
1790 CompiledDirectCall* cdc = CompiledDirectCall::at(call_addr);
1791 cdc->set_to_clean();
1792 break;
1793 }
1794 case relocInfo::virtual_call_type: {
1795 // compiled, dispatched call (which used to call an interpreted method)
1796 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1797 inline_cache->set_to_clean();
1798 break;
1799 }
1800 default:
1801 break;
1802 }
1803 }
1804 }
1805 }
1806
1807 methodHandle callee_method = find_callee_method(is_optimized, caller_is_c1, CHECK_(methodHandle()));
1808
1809 #ifndef PRODUCT
1810 Atomic::inc(&_wrong_method_ctr);
1811
1812 if (TraceCallFixup) {
1813 ResourceMark rm(current);
1814 tty->print("handle_wrong_method reresolving call%s to", (caller_is_c1) ? " from C1" : "");
1815 callee_method->print_short_name(tty);
1816 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1817 }
1818 #endif
1819
1820 return callee_method;
1821 }
1822
1823 address SharedRuntime::handle_unsafe_access(JavaThread* thread, address next_pc) {
1824 // The faulting unsafe accesses should be changed to throw the error
1825 // synchronously instead. Meanwhile the faulting instruction will be
1826 // skipped over (effectively turning it into a no-op) and an
1827 // asynchronous exception will be raised which the thread will
1828 // handle at a later point. If the instruction is a load it will
1829 // return garbage.
1830
1831 // Request an async exception.
1832 thread->set_pending_unsafe_access_error();
1833
1834 // Return address of next instruction to execute.
1835 return next_pc;
1836 }
1837
1838 #ifdef ASSERT
1839 void SharedRuntime::check_member_name_argument_is_last_argument(const methodHandle& method,
1840 const BasicType* sig_bt,
1841 const VMRegPair* regs) {
1842 ResourceMark rm;
1843 const int total_args_passed = method->size_of_parameters();
1844 const VMRegPair* regs_with_member_name = regs;
1845 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1);
1846
1847 const int member_arg_pos = total_args_passed - 1;
1848 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob");
1849 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object");
1850
1851 java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1);
1852
1853 for (int i = 0; i < member_arg_pos; i++) {
1854 VMReg a = regs_with_member_name[i].first();
1855 VMReg b = regs_without_member_name[i].first();
1856 assert(a->value() == b->value(), "register allocation mismatch: a= %d, b= %d", a->value(), b->value());
1857 }
1858 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg");
1859 }
1860 #endif
1861
1862 // ---------------------------------------------------------------------------
1863 // We are calling the interpreter via a c2i. Normally this would mean that
1864 // we were called by a compiled method. However we could have lost a race
1865 // where we went int -> i2c -> c2i and so the caller could in fact be
1866 // interpreted. If the caller is compiled we attempt to patch the caller
1867 // so he no longer calls into the interpreter.
1868 JRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc))
1869 AARCH64_PORT_ONLY(assert(pauth_ptr_is_raw(caller_pc), "should be raw"));
1870
1871 // It's possible that deoptimization can occur at a call site which hasn't
1872 // been resolved yet, in which case this function will be called from
1873 // an nmethod that has been patched for deopt and we can ignore the
1874 // request for a fixup.
1875 // Also it is possible that we lost a race in that from_compiled_entry
1876 // is now back to the i2c in that case we don't need to patch and if
1877 // we did we'd leap into space because the callsite needs to use
1878 // "to interpreter" stub in order to load up the Method*. Don't
1879 // ask me how I know this...
1880
1881 // Result from nmethod::is_unloading is not stable across safepoints.
1882 NoSafepointVerifier nsv;
1883
1884 nmethod* callee = method->code();
1885 if (callee == nullptr) {
1886 return;
1887 }
1888
1889 // write lock needed because we might patch call site by set_to_clean()
1890 // and is_unloading() can modify nmethod's state
1891 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, JavaThread::current()));
1892
1893 CodeBlob* cb = CodeCache::find_blob(caller_pc);
1894 if (cb == nullptr || !cb->is_nmethod() || !callee->is_in_use() || callee->is_unloading()) {
1895 return;
1896 }
1897
1898 // The check above makes sure this is an nmethod.
1899 nmethod* caller = cb->as_nmethod();
1900
1901 // Get the return PC for the passed caller PC.
1902 address return_pc = caller_pc + frame::pc_return_offset;
1903
1904 if (!caller->is_in_use() || !NativeCall::is_call_before(return_pc)) {
1905 return;
1906 }
1907
1908 // Expect to find a native call there (unless it was no-inline cache vtable dispatch)
1909 CompiledICLocker ic_locker(caller);
1910 ResourceMark rm;
1911
1912 // If we got here through a static call or opt_virtual call, then we know where the
1913 // call address would be; let's peek at it
1914 address callsite_addr = (address)nativeCall_before(return_pc);
1915 RelocIterator iter(caller, callsite_addr, callsite_addr + 1);
1916 if (!iter.next()) {
1917 // No reloc entry found; not a static or optimized virtual call
1918 return;
1919 }
1920
1921 relocInfo::relocType type = iter.reloc()->type();
1922 if (type != relocInfo::static_call_type &&
1923 type != relocInfo::opt_virtual_call_type) {
1924 return;
1925 }
1926
1927 CompiledDirectCall* callsite = CompiledDirectCall::before(return_pc);
1928 callsite->set_to_clean();
1929 JRT_END
1930
1931
1932 // same as JVM_Arraycopy, but called directly from compiled code
1933 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos,
1934 oopDesc* dest, jint dest_pos,
1935 jint length,
1936 JavaThread* current)) {
1937 #ifndef PRODUCT
1938 _slow_array_copy_ctr++;
1939 #endif
1940 // Check if we have null pointers
1941 if (src == nullptr || dest == nullptr) {
1942 THROW(vmSymbols::java_lang_NullPointerException());
1943 }
1944 // Do the copy. The casts to arrayOop are necessary to the copy_array API,
1945 // even though the copy_array API also performs dynamic checks to ensure
1946 // that src and dest are truly arrays (and are conformable).
1947 // The copy_array mechanism is awkward and could be removed, but
1948 // the compilers don't call this function except as a last resort,
1949 // so it probably doesn't matter.
1950 src->klass()->copy_array((arrayOopDesc*)src, src_pos,
1951 (arrayOopDesc*)dest, dest_pos,
1952 length, current);
1953 }
1954 JRT_END
1955
1956 // The caller of generate_class_cast_message() (or one of its callers)
1957 // must use a ResourceMark in order to correctly free the result.
1958 char* SharedRuntime::generate_class_cast_message(
1959 JavaThread* thread, Klass* caster_klass) {
1960
1961 // Get target class name from the checkcast instruction
1962 vframeStream vfst(thread, true);
1963 assert(!vfst.at_end(), "Java frame must exist");
1964 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci()));
1965 constantPoolHandle cpool(thread, vfst.method()->constants());
1966 Klass* target_klass = ConstantPool::klass_at_if_loaded(cpool, cc.index());
1967 Symbol* target_klass_name = nullptr;
1968 if (target_klass == nullptr) {
1969 // This klass should be resolved, but just in case, get the name in the klass slot.
1970 target_klass_name = cpool->klass_name_at(cc.index());
1971 }
1972 return generate_class_cast_message(caster_klass, target_klass, target_klass_name);
1973 }
1974
1975
1976 // The caller of generate_class_cast_message() (or one of its callers)
1977 // must use a ResourceMark in order to correctly free the result.
1978 char* SharedRuntime::generate_class_cast_message(
1979 Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name) {
1980 const char* caster_name = caster_klass->external_name();
1981
1982 assert(target_klass != nullptr || target_klass_name != nullptr, "one must be provided");
1983 const char* target_name = target_klass == nullptr ? target_klass_name->as_klass_external_name() :
1984 target_klass->external_name();
1985
1986 size_t msglen = strlen(caster_name) + strlen("class ") + strlen(" cannot be cast to class ") + strlen(target_name) + 1;
1987
1988 const char* caster_klass_description = "";
1989 const char* target_klass_description = "";
1990 const char* klass_separator = "";
1991 if (target_klass != nullptr && caster_klass->module() == target_klass->module()) {
1992 caster_klass_description = caster_klass->joint_in_module_of_loader(target_klass);
1993 } else {
1994 caster_klass_description = caster_klass->class_in_module_of_loader();
1995 target_klass_description = (target_klass != nullptr) ? target_klass->class_in_module_of_loader() : "";
1996 klass_separator = (target_klass != nullptr) ? "; " : "";
1997 }
1998
1999 // add 3 for parenthesis and preceding space
2000 msglen += strlen(caster_klass_description) + strlen(target_klass_description) + strlen(klass_separator) + 3;
2001
2002 char* message = NEW_RESOURCE_ARRAY_RETURN_NULL(char, msglen);
2003 if (message == nullptr) {
2004 // Shouldn't happen, but don't cause even more problems if it does
2005 message = const_cast<char*>(caster_klass->external_name());
2006 } else {
2007 jio_snprintf(message,
2008 msglen,
2009 "class %s cannot be cast to class %s (%s%s%s)",
2010 caster_name,
2011 target_name,
2012 caster_klass_description,
2013 klass_separator,
2014 target_klass_description
2015 );
2016 }
2017 return message;
2018 }
2019
2020 char* SharedRuntime::generate_identity_exception_message(JavaThread* current, Klass* klass) {
2021 assert(klass->is_inline_klass(), "Must be a concrete value class");
2022 const char* desc = "Cannot synchronize on an instance of value class ";
2023 const char* className = klass->external_name();
2024 size_t msglen = strlen(desc) + strlen(className) + 1;
2025 char* message = NEW_RESOURCE_ARRAY(char, msglen);
2026 if (nullptr == message) {
2027 // Out of memory: can't create detailed error message
2028 message = const_cast<char*>(klass->external_name());
2029 } else {
2030 jio_snprintf(message, msglen, "%s%s", desc, className);
2031 }
2032 return message;
2033 }
2034
2035 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
2036 (void) JavaThread::current()->stack_overflow_state()->reguard_stack();
2037 JRT_END
2038
2039 void SharedRuntime::monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* current) {
2040 if (!SafepointSynchronize::is_synchronizing()) {
2041 // Only try quick_enter() if we're not trying to reach a safepoint
2042 // so that the calling thread reaches the safepoint more quickly.
2043 if (ObjectSynchronizer::quick_enter(obj, lock, current)) {
2044 return;
2045 }
2046 }
2047 // NO_ASYNC required because an async exception on the state transition destructor
2048 // would leave you with the lock held and it would never be released.
2049 // The normal monitorenter NullPointerException is thrown without acquiring a lock
2050 // and the model is that an exception implies the method failed.
2051 JRT_BLOCK_NO_ASYNC
2052 Handle h_obj(THREAD, obj);
2053 ObjectSynchronizer::enter(h_obj, lock, current);
2054 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
2055 JRT_BLOCK_END
2056 }
2057
2058 // Handles the uncommon case in locking, i.e., contention or an inflated lock.
2059 JRT_BLOCK_ENTRY(void, SharedRuntime::complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current))
2060 SharedRuntime::monitor_enter_helper(obj, lock, current);
2061 JRT_END
2062
2063 void SharedRuntime::monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current) {
2064 assert(JavaThread::current() == current, "invariant");
2065 // Exit must be non-blocking, and therefore no exceptions can be thrown.
2066 ExceptionMark em(current);
2067
2068 // Check if C2_MacroAssembler::fast_unlock() or
2069 // C2_MacroAssembler::fast_unlock_lightweight() unlocked an inflated
2070 // monitor before going slow path. Since there is no safepoint
2071 // polling when calling into the VM, we can be sure that the monitor
2072 // hasn't been deallocated.
2073 ObjectMonitor* m = current->unlocked_inflated_monitor();
2074 if (m != nullptr) {
2075 assert(!m->has_owner(current), "must be");
2076 current->clear_unlocked_inflated_monitor();
2077
2078 // We need to reacquire the lock before we can call ObjectSynchronizer::exit().
2079 if (!m->try_enter(current, /*check_for_recursion*/ false)) {
2080 // Some other thread acquired the lock (or the monitor was
2081 // deflated). Either way we are done.
2082 current->dec_held_monitor_count();
2083 return;
2084 }
2085 }
2086
2087 // The object could become unlocked through a JNI call, which we have no other checks for.
2088 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
2089 if (obj->is_unlocked()) {
2090 if (CheckJNICalls) {
2091 fatal("Object has been unlocked by JNI");
2092 }
2093 return;
2094 }
2095 ObjectSynchronizer::exit(obj, lock, current);
2096 }
2097
2098 // Handles the uncommon cases of monitor unlocking in compiled code
2099 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current))
2100 assert(current == JavaThread::current(), "pre-condition");
2101 SharedRuntime::monitor_exit_helper(obj, lock, current);
2102 JRT_END
2103
2104 // This is only called when CheckJNICalls is true, and only
2105 // for virtual thread termination.
2106 JRT_LEAF(void, SharedRuntime::log_jni_monitor_still_held())
2107 assert(CheckJNICalls, "Only call this when checking JNI usage");
2108 if (log_is_enabled(Debug, jni)) {
2109 JavaThread* current = JavaThread::current();
2110 int64_t vthread_id = java_lang_Thread::thread_id(current->vthread());
2111 int64_t carrier_id = java_lang_Thread::thread_id(current->threadObj());
2112 log_debug(jni)("VirtualThread (tid: " INT64_FORMAT ", carrier id: " INT64_FORMAT
2113 ") exiting with Objects still locked by JNI MonitorEnter.",
2114 vthread_id, carrier_id);
2115 }
2116 JRT_END
2117
2118 #ifndef PRODUCT
2119
2120 void SharedRuntime::print_statistics() {
2121 ttyLocker ttyl;
2122 if (xtty != nullptr) xtty->head("statistics type='SharedRuntime'");
2123
2124 SharedRuntime::print_ic_miss_histogram();
2125
2126 // Dump the JRT_ENTRY counters
2127 if (_new_instance_ctr) tty->print_cr("%5u new instance requires GC", _new_instance_ctr);
2128 if (_new_array_ctr) tty->print_cr("%5u new array requires GC", _new_array_ctr);
2129 if (_multi2_ctr) tty->print_cr("%5u multianewarray 2 dim", _multi2_ctr);
2130 if (_multi3_ctr) tty->print_cr("%5u multianewarray 3 dim", _multi3_ctr);
2131 if (_multi4_ctr) tty->print_cr("%5u multianewarray 4 dim", _multi4_ctr);
2132 if (_multi5_ctr) tty->print_cr("%5u multianewarray 5 dim", _multi5_ctr);
2133
2134 tty->print_cr("%5u inline cache miss in compiled", _ic_miss_ctr);
2135 tty->print_cr("%5u wrong method", _wrong_method_ctr);
2136 tty->print_cr("%5u unresolved static call site", _resolve_static_ctr);
2137 tty->print_cr("%5u unresolved virtual call site", _resolve_virtual_ctr);
2138 tty->print_cr("%5u unresolved opt virtual call site", _resolve_opt_virtual_ctr);
2139
2140 if (_mon_enter_stub_ctr) tty->print_cr("%5u monitor enter stub", _mon_enter_stub_ctr);
2141 if (_mon_exit_stub_ctr) tty->print_cr("%5u monitor exit stub", _mon_exit_stub_ctr);
2142 if (_mon_enter_ctr) tty->print_cr("%5u monitor enter slow", _mon_enter_ctr);
2143 if (_mon_exit_ctr) tty->print_cr("%5u monitor exit slow", _mon_exit_ctr);
2144 if (_partial_subtype_ctr) tty->print_cr("%5u slow partial subtype", _partial_subtype_ctr);
2145 if (_jbyte_array_copy_ctr) tty->print_cr("%5u byte array copies", _jbyte_array_copy_ctr);
2146 if (_jshort_array_copy_ctr) tty->print_cr("%5u short array copies", _jshort_array_copy_ctr);
2147 if (_jint_array_copy_ctr) tty->print_cr("%5u int array copies", _jint_array_copy_ctr);
2148 if (_jlong_array_copy_ctr) tty->print_cr("%5u long array copies", _jlong_array_copy_ctr);
2149 if (_oop_array_copy_ctr) tty->print_cr("%5u oop array copies", _oop_array_copy_ctr);
2150 if (_checkcast_array_copy_ctr) tty->print_cr("%5u checkcast array copies", _checkcast_array_copy_ctr);
2151 if (_unsafe_array_copy_ctr) tty->print_cr("%5u unsafe array copies", _unsafe_array_copy_ctr);
2152 if (_generic_array_copy_ctr) tty->print_cr("%5u generic array copies", _generic_array_copy_ctr);
2153 if (_slow_array_copy_ctr) tty->print_cr("%5u slow array copies", _slow_array_copy_ctr);
2154 if (_find_handler_ctr) tty->print_cr("%5u find exception handler", _find_handler_ctr);
2155 if (_rethrow_ctr) tty->print_cr("%5u rethrow handler", _rethrow_ctr);
2156 if (_unsafe_set_memory_ctr) tty->print_cr("%5u unsafe set memorys", _unsafe_set_memory_ctr);
2157
2158 AdapterHandlerLibrary::print_statistics();
2159
2160 if (xtty != nullptr) xtty->tail("statistics");
2161 }
2162
2163 inline double percent(int64_t x, int64_t y) {
2164 return 100.0 * (double)x / (double)MAX2(y, (int64_t)1);
2165 }
2166
2167 class MethodArityHistogram {
2168 public:
2169 enum { MAX_ARITY = 256 };
2170 private:
2171 static uint64_t _arity_histogram[MAX_ARITY]; // histogram of #args
2172 static uint64_t _size_histogram[MAX_ARITY]; // histogram of arg size in words
2173 static uint64_t _total_compiled_calls;
2174 static uint64_t _max_compiled_calls_per_method;
2175 static int _max_arity; // max. arity seen
2176 static int _max_size; // max. arg size seen
2177
2178 static void add_method_to_histogram(nmethod* nm) {
2179 Method* method = (nm == nullptr) ? nullptr : nm->method();
2180 if (method != nullptr) {
2181 ArgumentCount args(method->signature());
2182 int arity = args.size() + (method->is_static() ? 0 : 1);
2183 int argsize = method->size_of_parameters();
2184 arity = MIN2(arity, MAX_ARITY-1);
2185 argsize = MIN2(argsize, MAX_ARITY-1);
2186 uint64_t count = (uint64_t)method->compiled_invocation_count();
2187 _max_compiled_calls_per_method = count > _max_compiled_calls_per_method ? count : _max_compiled_calls_per_method;
2188 _total_compiled_calls += count;
2189 _arity_histogram[arity] += count;
2190 _size_histogram[argsize] += count;
2191 _max_arity = MAX2(_max_arity, arity);
2192 _max_size = MAX2(_max_size, argsize);
2193 }
2194 }
2195
2196 void print_histogram_helper(int n, uint64_t* histo, const char* name) {
2197 const int N = MIN2(9, n);
2198 double sum = 0;
2199 double weighted_sum = 0;
2200 for (int i = 0; i <= n; i++) { sum += (double)histo[i]; weighted_sum += (double)(i*histo[i]); }
2201 if (sum >= 1) { // prevent divide by zero or divide overflow
2202 double rest = sum;
2203 double percent = sum / 100;
2204 for (int i = 0; i <= N; i++) {
2205 rest -= (double)histo[i];
2206 tty->print_cr("%4d: " UINT64_FORMAT_W(12) " (%5.1f%%)", i, histo[i], (double)histo[i] / percent);
2207 }
2208 tty->print_cr("rest: " INT64_FORMAT_W(12) " (%5.1f%%)", (int64_t)rest, rest / percent);
2209 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n);
2210 tty->print_cr("(total # of compiled calls = " INT64_FORMAT_W(14) ")", _total_compiled_calls);
2211 tty->print_cr("(max # of compiled calls = " INT64_FORMAT_W(14) ")", _max_compiled_calls_per_method);
2212 } else {
2213 tty->print_cr("Histogram generation failed for %s. n = %d, sum = %7.5f", name, n, sum);
2214 }
2215 }
2216
2217 void print_histogram() {
2218 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2219 print_histogram_helper(_max_arity, _arity_histogram, "arity");
2220 tty->print_cr("\nHistogram of parameter block size (in words, incl. rcvr):");
2221 print_histogram_helper(_max_size, _size_histogram, "size");
2222 tty->cr();
2223 }
2224
2225 public:
2226 MethodArityHistogram() {
2227 // Take the Compile_lock to protect against changes in the CodeBlob structures
2228 MutexLocker mu1(Compile_lock, Mutex::_safepoint_check_flag);
2229 // Take the CodeCache_lock to protect against changes in the CodeHeap structure
2230 MutexLocker mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2231 _max_arity = _max_size = 0;
2232 _total_compiled_calls = 0;
2233 _max_compiled_calls_per_method = 0;
2234 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram[i] = 0;
2235 CodeCache::nmethods_do(add_method_to_histogram);
2236 print_histogram();
2237 }
2238 };
2239
2240 uint64_t MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY];
2241 uint64_t MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY];
2242 uint64_t MethodArityHistogram::_total_compiled_calls;
2243 uint64_t MethodArityHistogram::_max_compiled_calls_per_method;
2244 int MethodArityHistogram::_max_arity;
2245 int MethodArityHistogram::_max_size;
2246
2247 void SharedRuntime::print_call_statistics(uint64_t comp_total) {
2248 tty->print_cr("Calls from compiled code:");
2249 int64_t total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls;
2250 int64_t mono_c = _nof_normal_calls - _nof_megamorphic_calls;
2251 int64_t mono_i = _nof_interface_calls;
2252 tty->print_cr("\t" INT64_FORMAT_W(12) " (100%%) total non-inlined ", total);
2253 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.1f%%) |- virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total));
2254 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls));
2255 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- monomorphic ", mono_c, percent(mono_c, _nof_normal_calls));
2256 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls));
2257 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.1f%%) |- interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total));
2258 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls));
2259 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- monomorphic ", mono_i, percent(mono_i, _nof_interface_calls));
2260 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.1f%%) |- static/special calls", _nof_static_calls, percent(_nof_static_calls, total));
2261 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls));
2262 tty->cr();
2263 tty->print_cr("Note 1: counter updates are not MT-safe.");
2264 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
2265 tty->print_cr(" %% in nested categories are relative to their category");
2266 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
2267 tty->cr();
2268
2269 MethodArityHistogram h;
2270 }
2271 #endif
2272
2273 #ifndef PRODUCT
2274 static int _lookups; // number of calls to lookup
2275 static int _equals; // number of buckets checked with matching hash
2276 static int _archived_hits; // number of successful lookups in archived table
2277 static int _runtime_hits; // number of successful lookups in runtime table
2278 #endif
2279
2280 // A simple wrapper class around the calling convention information
2281 // that allows sharing of adapters for the same calling convention.
2282 class AdapterFingerPrint : public MetaspaceObj {
2283 private:
2284 enum {
2285 _basic_type_bits = 5,
2286 _basic_type_mask = right_n_bits(_basic_type_bits),
2287 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2288 };
2289 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2290 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2291
2292 int _length;
2293
2294 static int data_offset() { return sizeof(AdapterFingerPrint); }
2295 int* data_pointer() {
2296 return (int*)((address)this + data_offset());
2297 }
2298
2299 // Private construtor. Use allocate() to get an instance.
2300 AdapterFingerPrint(const GrowableArray<SigEntry>* sig, bool has_ro_adapter = false) {
2301 int* data = data_pointer();
2302 // Pack the BasicTypes with 8 per int
2303 int total_args_passed = total_args_passed_in_sig(sig);
2304 _length = length(total_args_passed);
2305 int sig_index = 0;
2306 BasicType prev_bt = T_ILLEGAL;
2307 int vt_count = 0;
2308 for (int index = 0; index < _length; index++) {
2309 int value = 0;
2310 for (int byte = 0; byte < _basic_types_per_int; byte++) {
2311 BasicType bt = T_ILLEGAL;
2312 if (sig_index < total_args_passed) {
2313 bt = sig->at(sig_index++)._bt;
2314 if (bt == T_METADATA) {
2315 // Found start of inline type in signature
2316 assert(InlineTypePassFieldsAsArgs, "unexpected start of inline type");
2317 if (sig_index == 1 && has_ro_adapter) {
2318 // With a ro_adapter, replace receiver inline type delimiter by T_VOID to prevent matching
2319 // with other adapters that have the same inline type as first argument and no receiver.
2320 bt = T_VOID;
2321 }
2322 vt_count++;
2323 } else if (bt == T_VOID && prev_bt != T_LONG && prev_bt != T_DOUBLE) {
2324 // Found end of inline type in signature
2325 assert(InlineTypePassFieldsAsArgs, "unexpected end of inline type");
2326 vt_count--;
2327 assert(vt_count >= 0, "invalid vt_count");
2328 } else if (vt_count == 0) {
2329 // Widen fields that are not part of a scalarized inline type argument
2330 bt = adapter_encoding(bt);
2331 }
2332 prev_bt = bt;
2333 }
2334 int bt_val = (bt == T_ILLEGAL) ? 0 : bt;
2335 assert((bt_val & _basic_type_mask) == bt_val, "must fit in 4 bits");
2336 value = (value << _basic_type_bits) | bt_val;
2337 }
2338 data[index] = value;
2339 }
2340 assert(vt_count == 0, "invalid vt_count");
2341 }
2342
2343 // Call deallocate instead
2344 ~AdapterFingerPrint() {
2345 ShouldNotCallThis();
2346 }
2347
2348 static int total_args_passed_in_sig(const GrowableArray<SigEntry>* sig) {
2349 return (sig != nullptr) ? sig->length() : 0;
2350 }
2351
2352 static int length(int total_args) {
2353 return (total_args + (_basic_types_per_int-1)) / _basic_types_per_int;
2354 }
2355
2356 static int compute_size_in_words(int len) {
2357 return (int)heap_word_size(sizeof(AdapterFingerPrint) + (len * sizeof(int)));
2358 }
2359
2360 // Remap BasicTypes that are handled equivalently by the adapters.
2361 // These are correct for the current system but someday it might be
2362 // necessary to make this mapping platform dependent.
2363 static BasicType adapter_encoding(BasicType in) {
2364 switch (in) {
2365 case T_BOOLEAN:
2366 case T_BYTE:
2367 case T_SHORT:
2368 case T_CHAR:
2369 // They are all promoted to T_INT in the calling convention
2370 return T_INT;
2371
2372 case T_OBJECT:
2373 case T_ARRAY:
2374 // In other words, we assume that any register good enough for
2375 // an int or long is good enough for a managed pointer.
2376 #ifdef _LP64
2377 return T_LONG;
2378 #else
2379 return T_INT;
2380 #endif
2381
2382 case T_INT:
2383 case T_LONG:
2384 case T_FLOAT:
2385 case T_DOUBLE:
2386 case T_VOID:
2387 return in;
2388
2389 default:
2390 ShouldNotReachHere();
2391 return T_CONFLICT;
2392 }
2393 }
2394
2395 void* operator new(size_t size, size_t fp_size) throw() {
2396 assert(fp_size >= size, "sanity check");
2397 void* p = AllocateHeap(fp_size, mtCode);
2398 memset(p, 0, fp_size);
2399 return p;
2400 }
2401
2402 public:
2403 template<typename Function>
2404 void iterate_args(Function function) {
2405 for (int i = 0; i < length(); i++) {
2406 unsigned val = (unsigned)value(i);
2407 // args are packed so that first/lower arguments are in the highest
2408 // bits of each int value, so iterate from highest to the lowest
2409 int first_entry = _basic_types_per_int * _basic_type_bits;
2410 for (int j = first_entry; j >= 0; j -= _basic_type_bits) {
2411 unsigned v = (val >> j) & _basic_type_mask;
2412 if (v == 0) {
2413 continue;
2414 }
2415 function(v);
2416 }
2417 }
2418 }
2419
2420 static AdapterFingerPrint* allocate(const GrowableArray<SigEntry>* sig, bool has_ro_adapter = false) {
2421 int total_args_passed = total_args_passed_in_sig(sig);
2422 int len = length(total_args_passed);
2423 int size_in_bytes = BytesPerWord * compute_size_in_words(len);
2424 AdapterFingerPrint* afp = new (size_in_bytes) AdapterFingerPrint(sig, has_ro_adapter);
2425 assert((afp->size() * BytesPerWord) == size_in_bytes, "should match");
2426 return afp;
2427 }
2428
2429 static void deallocate(AdapterFingerPrint* fp) {
2430 FreeHeap(fp);
2431 }
2432
2433 int value(int index) {
2434 int* data = data_pointer();
2435 return data[index];
2436 }
2437
2438 int length() {
2439 return _length;
2440 }
2441
2442 unsigned int compute_hash() {
2443 int hash = 0;
2444 for (int i = 0; i < length(); i++) {
2445 int v = value(i);
2446 //Add arithmetic operation to the hash, like +3 to improve hashing
2447 hash = ((hash << 8) ^ v ^ (hash >> 5)) + 3;
2448 }
2449 return (unsigned int)hash;
2450 }
2451
2452 const char* as_string() {
2453 stringStream st;
2454 st.print("0x");
2455 for (int i = 0; i < length(); i++) {
2456 st.print("%x", value(i));
2457 }
2458 return st.as_string();
2459 }
2460
2461 const char* as_basic_args_string() {
2462 stringStream st;
2463 bool long_prev = false;
2464 iterate_args([&] (int arg) {
2465 if (long_prev) {
2466 long_prev = false;
2467 if (arg == T_VOID) {
2468 st.print("J");
2469 } else {
2470 st.print("L");
2471 }
2472 }
2473 if (arg == T_LONG) {
2474 long_prev = true;
2475 } else if (arg != T_VOID) {
2476 st.print("%c", type2char((BasicType)arg));
2477 }
2478 });
2479 if (long_prev) {
2480 st.print("L");
2481 }
2482 return st.as_string();
2483 }
2484
2485 bool equals(AdapterFingerPrint* other) {
2486 if (other->_length != _length) {
2487 return false;
2488 } else {
2489 for (int i = 0; i < _length; i++) {
2490 if (value(i) != other->value(i)) {
2491 return false;
2492 }
2493 }
2494 }
2495 return true;
2496 }
2497
2498 // methods required by virtue of being a MetaspaceObj
2499 void metaspace_pointers_do(MetaspaceClosure* it) { return; /* nothing to do here */ }
2500 int size() const { return compute_size_in_words(_length); }
2501 MetaspaceObj::Type type() const { return AdapterFingerPrintType; }
2502
2503 static bool equals(AdapterFingerPrint* const& fp1, AdapterFingerPrint* const& fp2) {
2504 NOT_PRODUCT(_equals++);
2505 return fp1->equals(fp2);
2506 }
2507
2508 static unsigned int compute_hash(AdapterFingerPrint* const& fp) {
2509 return fp->compute_hash();
2510 }
2511 };
2512
2513 #if INCLUDE_CDS
2514 static inline bool adapter_fp_equals_compact_hashtable_entry(AdapterHandlerEntry* entry, AdapterFingerPrint* fp, int len_unused) {
2515 return AdapterFingerPrint::equals(entry->fingerprint(), fp);
2516 }
2517
2518 class ArchivedAdapterTable : public OffsetCompactHashtable<
2519 AdapterFingerPrint*,
2520 AdapterHandlerEntry*,
2521 adapter_fp_equals_compact_hashtable_entry> {};
2522 #endif // INCLUDE_CDS
2523
2524 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
2525 using AdapterHandlerTable = HashTable<AdapterFingerPrint*, AdapterHandlerEntry*, 293,
2526 AnyObj::C_HEAP, mtCode,
2527 AdapterFingerPrint::compute_hash,
2528 AdapterFingerPrint::equals>;
2529 static AdapterHandlerTable* _adapter_handler_table;
2530 static GrowableArray<AdapterHandlerEntry*>* _adapter_handler_list = nullptr;
2531
2532 // Find a entry with the same fingerprint if it exists
2533 AdapterHandlerEntry* AdapterHandlerLibrary::lookup(const GrowableArray<SigEntry>* sig, bool has_ro_adapter) {
2534 NOT_PRODUCT(_lookups++);
2535 assert_lock_strong(AdapterHandlerLibrary_lock);
2536 AdapterFingerPrint* fp = AdapterFingerPrint::allocate(sig, has_ro_adapter);
2537 AdapterHandlerEntry* entry = nullptr;
2538 #if INCLUDE_CDS
2539 // if we are building the archive then the archived adapter table is
2540 // not valid and we need to use the ones added to the runtime table
2541 if (AOTCodeCache::is_using_adapter()) {
2542 // Search archived table first. It is read-only table so can be searched without lock
2543 entry = _aot_adapter_handler_table.lookup(fp, fp->compute_hash(), 0 /* unused */);
2544 #ifndef PRODUCT
2545 if (entry != nullptr) {
2546 _archived_hits++;
2547 }
2548 #endif
2549 }
2550 #endif // INCLUDE_CDS
2551 if (entry == nullptr) {
2552 assert_lock_strong(AdapterHandlerLibrary_lock);
2553 AdapterHandlerEntry** entry_p = _adapter_handler_table->get(fp);
2554 if (entry_p != nullptr) {
2555 entry = *entry_p;
2556 assert(entry->fingerprint()->equals(fp), "fingerprint mismatch key fp %s %s (hash=%d) != found fp %s %s (hash=%d)",
2557 entry->fingerprint()->as_basic_args_string(), entry->fingerprint()->as_string(), entry->fingerprint()->compute_hash(),
2558 fp->as_basic_args_string(), fp->as_string(), fp->compute_hash());
2559 #ifndef PRODUCT
2560 _runtime_hits++;
2561 #endif
2562 }
2563 }
2564 AdapterFingerPrint::deallocate(fp);
2565 return entry;
2566 }
2567
2568 #ifndef PRODUCT
2569 static void print_table_statistics() {
2570 auto size = [&] (AdapterFingerPrint* key, AdapterHandlerEntry* a) {
2571 return sizeof(*key) + sizeof(*a);
2572 };
2573 TableStatistics ts = _adapter_handler_table->statistics_calculate(size);
2574 ts.print(tty, "AdapterHandlerTable");
2575 tty->print_cr("AdapterHandlerTable (table_size=%d, entries=%d)",
2576 _adapter_handler_table->table_size(), _adapter_handler_table->number_of_entries());
2577 int total_hits = _archived_hits + _runtime_hits;
2578 tty->print_cr("AdapterHandlerTable: lookups %d equals %d hits %d (archived=%d+runtime=%d)",
2579 _lookups, _equals, total_hits, _archived_hits, _runtime_hits);
2580 }
2581 #endif
2582
2583 // ---------------------------------------------------------------------------
2584 // Implementation of AdapterHandlerLibrary
2585 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = nullptr;
2586 AdapterHandlerEntry* AdapterHandlerLibrary::_no_arg_handler = nullptr;
2587 AdapterHandlerEntry* AdapterHandlerLibrary::_int_arg_handler = nullptr;
2588 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_arg_handler = nullptr;
2589 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_int_arg_handler = nullptr;
2590 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_obj_arg_handler = nullptr;
2591 #if INCLUDE_CDS
2592 ArchivedAdapterTable AdapterHandlerLibrary::_aot_adapter_handler_table;
2593 #endif // INCLUDE_CDS
2594 static const int AdapterHandlerLibrary_size = 48*K;
2595 BufferBlob* AdapterHandlerLibrary::_buffer = nullptr;
2596
2597 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2598 assert(_buffer != nullptr, "should be initialized");
2599 return _buffer;
2600 }
2601
2602 static void post_adapter_creation(const AdapterBlob* new_adapter,
2603 const AdapterHandlerEntry* entry) {
2604 if (Forte::is_enabled() || JvmtiExport::should_post_dynamic_code_generated()) {
2605 char blob_id[256];
2606 jio_snprintf(blob_id,
2607 sizeof(blob_id),
2608 "%s(%s)",
2609 new_adapter->name(),
2610 entry->fingerprint()->as_string());
2611 if (Forte::is_enabled()) {
2612 Forte::register_stub(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2613 }
2614
2615 if (JvmtiExport::should_post_dynamic_code_generated()) {
2616 JvmtiExport::post_dynamic_code_generated(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2617 }
2618 }
2619 }
2620
2621 void AdapterHandlerLibrary::create_abstract_method_handler() {
2622 assert_lock_strong(AdapterHandlerLibrary_lock);
2623 // Create a special handler for abstract methods. Abstract methods
2624 // are never compiled so an i2c entry is somewhat meaningless, but
2625 // throw AbstractMethodError just in case.
2626 // Pass wrong_method_abstract for the c2i transitions to return
2627 // AbstractMethodError for invalid invocations.
2628 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
2629 _abstract_method_handler = AdapterHandlerLibrary::new_entry(AdapterFingerPrint::allocate(nullptr));
2630 _abstract_method_handler->set_entry_points(SharedRuntime::throw_AbstractMethodError_entry(),
2631 wrong_method_abstract, wrong_method_abstract, wrong_method_abstract,
2632 wrong_method_abstract, wrong_method_abstract);
2633 }
2634
2635 void AdapterHandlerLibrary::initialize() {
2636 {
2637 ResourceMark rm;
2638 MutexLocker mu(AdapterHandlerLibrary_lock);
2639 _adapter_handler_table = new (mtCode) AdapterHandlerTable();
2640 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2641 create_abstract_method_handler();
2642 }
2643
2644 #if INCLUDE_CDS
2645 // Link adapters in AOT Cache to their code in AOT Code Cache
2646 if (AOTCodeCache::is_using_adapter() && !_aot_adapter_handler_table.empty()) {
2647 link_aot_adapters();
2648 lookup_simple_adapters();
2649 return;
2650 }
2651 #endif // INCLUDE_CDS
2652
2653 ResourceMark rm;
2654 AdapterBlob* no_arg_blob = nullptr;
2655 AdapterBlob* int_arg_blob = nullptr;
2656 AdapterBlob* obj_arg_blob = nullptr;
2657 AdapterBlob* obj_int_arg_blob = nullptr;
2658 AdapterBlob* obj_obj_arg_blob = nullptr;
2659 {
2660 MutexLocker mu(AdapterHandlerLibrary_lock);
2661
2662 CompiledEntrySignature no_args;
2663 no_args.compute_calling_conventions();
2664 _no_arg_handler = create_adapter(no_arg_blob, no_args, true);
2665
2666 CompiledEntrySignature obj_args;
2667 SigEntry::add_entry(obj_args.sig(), T_OBJECT);
2668 obj_args.compute_calling_conventions();
2669 _obj_arg_handler = create_adapter(obj_arg_blob, obj_args, true);
2670
2671 CompiledEntrySignature int_args;
2672 SigEntry::add_entry(int_args.sig(), T_INT);
2673 int_args.compute_calling_conventions();
2674 _int_arg_handler = create_adapter(int_arg_blob, int_args, true);
2675
2676 CompiledEntrySignature obj_int_args;
2677 SigEntry::add_entry(obj_int_args.sig(), T_OBJECT);
2678 SigEntry::add_entry(obj_int_args.sig(), T_INT);
2679 obj_int_args.compute_calling_conventions();
2680 _obj_int_arg_handler = create_adapter(obj_int_arg_blob, obj_int_args, true);
2681
2682 CompiledEntrySignature obj_obj_args;
2683 SigEntry::add_entry(obj_obj_args.sig(), T_OBJECT);
2684 SigEntry::add_entry(obj_obj_args.sig(), T_OBJECT);
2685 obj_obj_args.compute_calling_conventions();
2686 _obj_obj_arg_handler = create_adapter(obj_obj_arg_blob, obj_obj_args, true);
2687
2688 // we should always get an entry back but we don't have any
2689 // associated blob on Zero
2690 assert(_no_arg_handler != nullptr &&
2691 _obj_arg_handler != nullptr &&
2692 _int_arg_handler != nullptr &&
2693 _obj_int_arg_handler != nullptr &&
2694 _obj_obj_arg_handler != nullptr, "Initial adapter handlers must be properly created");
2695 }
2696
2697 // Outside of the lock
2698 #ifndef ZERO
2699 // no blobs to register when we are on Zero
2700 post_adapter_creation(no_arg_blob, _no_arg_handler);
2701 post_adapter_creation(obj_arg_blob, _obj_arg_handler);
2702 post_adapter_creation(int_arg_blob, _int_arg_handler);
2703 post_adapter_creation(obj_int_arg_blob, _obj_int_arg_handler);
2704 post_adapter_creation(obj_obj_arg_blob, _obj_obj_arg_handler);
2705 #endif // ZERO
2706 }
2707
2708 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint) {
2709 return AdapterHandlerEntry::allocate(fingerprint);
2710 }
2711
2712 AdapterHandlerEntry* AdapterHandlerLibrary::get_simple_adapter(const methodHandle& method) {
2713 if (method->is_abstract()) {
2714 return nullptr;
2715 }
2716 int total_args_passed = method->size_of_parameters(); // All args on stack
2717 if (total_args_passed == 0) {
2718 return _no_arg_handler;
2719 } else if (total_args_passed == 1) {
2720 if (!method->is_static()) {
2721 if (InlineTypePassFieldsAsArgs && method->method_holder()->is_inline_klass()) {
2722 return nullptr;
2723 }
2724 return _obj_arg_handler;
2725 }
2726 switch (method->signature()->char_at(1)) {
2727 case JVM_SIGNATURE_CLASS: {
2728 if (InlineTypePassFieldsAsArgs) {
2729 SignatureStream ss(method->signature());
2730 InlineKlass* vk = ss.as_inline_klass(method->method_holder());
2731 if (vk != nullptr) {
2732 return nullptr;
2733 }
2734 }
2735 return _obj_arg_handler;
2736 }
2737 case JVM_SIGNATURE_ARRAY:
2738 return _obj_arg_handler;
2739 case JVM_SIGNATURE_INT:
2740 case JVM_SIGNATURE_BOOLEAN:
2741 case JVM_SIGNATURE_CHAR:
2742 case JVM_SIGNATURE_BYTE:
2743 case JVM_SIGNATURE_SHORT:
2744 return _int_arg_handler;
2745 }
2746 } else if (total_args_passed == 2 &&
2747 !method->is_static() && (!InlineTypePassFieldsAsArgs || !method->method_holder()->is_inline_klass())) {
2748 switch (method->signature()->char_at(1)) {
2749 case JVM_SIGNATURE_CLASS: {
2750 if (InlineTypePassFieldsAsArgs) {
2751 SignatureStream ss(method->signature());
2752 InlineKlass* vk = ss.as_inline_klass(method->method_holder());
2753 if (vk != nullptr) {
2754 return nullptr;
2755 }
2756 }
2757 return _obj_obj_arg_handler;
2758 }
2759 case JVM_SIGNATURE_ARRAY:
2760 return _obj_obj_arg_handler;
2761 case JVM_SIGNATURE_INT:
2762 case JVM_SIGNATURE_BOOLEAN:
2763 case JVM_SIGNATURE_CHAR:
2764 case JVM_SIGNATURE_BYTE:
2765 case JVM_SIGNATURE_SHORT:
2766 return _obj_int_arg_handler;
2767 }
2768 }
2769 return nullptr;
2770 }
2771
2772 CompiledEntrySignature::CompiledEntrySignature(Method* method) :
2773 _method(method), _num_inline_args(0), _has_inline_recv(false),
2774 _regs(nullptr), _regs_cc(nullptr), _regs_cc_ro(nullptr),
2775 _args_on_stack(0), _args_on_stack_cc(0), _args_on_stack_cc_ro(0),
2776 _c1_needs_stack_repair(false), _c2_needs_stack_repair(false), _supers(nullptr) {
2777 _sig = new GrowableArray<SigEntry>((method != nullptr) ? method->size_of_parameters() : 1);
2778 _sig_cc = new GrowableArray<SigEntry>((method != nullptr) ? method->size_of_parameters() : 1);
2779 _sig_cc_ro = new GrowableArray<SigEntry>((method != nullptr) ? method->size_of_parameters() : 1);
2780 }
2781
2782 // See if we can save space by sharing the same entry for VIEP and VIEP(RO),
2783 // or the same entry for VEP and VIEP(RO).
2784 CodeOffsets::Entries CompiledEntrySignature::c1_inline_ro_entry_type() const {
2785 if (!has_scalarized_args()) {
2786 // VEP/VIEP/VIEP(RO) all share the same entry. There's no packing.
2787 return CodeOffsets::Verified_Entry;
2788 }
2789 if (_method->is_static()) {
2790 // Static methods don't need VIEP(RO)
2791 return CodeOffsets::Verified_Entry;
2792 }
2793
2794 if (has_inline_recv()) {
2795 if (num_inline_args() == 1) {
2796 // Share same entry for VIEP and VIEP(RO).
2797 // This is quite common: we have an instance method in an InlineKlass that has
2798 // no inline type args other than <this>.
2799 return CodeOffsets::Verified_Inline_Entry;
2800 } else {
2801 assert(num_inline_args() > 1, "must be");
2802 // No sharing:
2803 // VIEP(RO) -- <this> is passed as object
2804 // VEP -- <this> is passed as fields
2805 return CodeOffsets::Verified_Inline_Entry_RO;
2806 }
2807 }
2808
2809 // Either a static method, or <this> is not an inline type
2810 if (args_on_stack_cc() != args_on_stack_cc_ro()) {
2811 // No sharing:
2812 // Some arguments are passed on the stack, and we have inserted reserved entries
2813 // into the VEP, but we never insert reserved entries into the VIEP(RO).
2814 return CodeOffsets::Verified_Inline_Entry_RO;
2815 } else {
2816 // Share same entry for VEP and VIEP(RO).
2817 return CodeOffsets::Verified_Entry;
2818 }
2819 }
2820
2821 // Returns all super methods (transitive) in classes and interfaces that are overridden by the current method.
2822 GrowableArray<Method*>* CompiledEntrySignature::get_supers() {
2823 if (_supers != nullptr) {
2824 return _supers;
2825 }
2826 _supers = new GrowableArray<Method*>();
2827 // Skip private, static, and <init> methods
2828 if (_method->is_private() || _method->is_static() || _method->is_object_constructor()) {
2829 return _supers;
2830 }
2831 Symbol* name = _method->name();
2832 Symbol* signature = _method->signature();
2833 const Klass* holder = _method->method_holder()->super();
2834 Symbol* holder_name = holder->name();
2835 ThreadInVMfromUnknown tiv;
2836 JavaThread* current = JavaThread::current();
2837 HandleMark hm(current);
2838 Handle loader(current, _method->method_holder()->class_loader());
2839
2840 // Walk up the class hierarchy and search for super methods
2841 while (holder != nullptr) {
2842 Method* super_method = holder->lookup_method(name, signature);
2843 if (super_method == nullptr) {
2844 break;
2845 }
2846 if (!super_method->is_static() && !super_method->is_private() &&
2847 (!super_method->is_package_private() ||
2848 super_method->method_holder()->is_same_class_package(loader(), holder_name))) {
2849 _supers->push(super_method);
2850 }
2851 holder = super_method->method_holder()->super();
2852 }
2853 // Search interfaces for super methods
2854 Array<InstanceKlass*>* interfaces = _method->method_holder()->transitive_interfaces();
2855 for (int i = 0; i < interfaces->length(); ++i) {
2856 Method* m = interfaces->at(i)->lookup_method(name, signature);
2857 if (m != nullptr && !m->is_static() && m->is_public()) {
2858 _supers->push(m);
2859 }
2860 }
2861 return _supers;
2862 }
2863
2864 // Iterate over arguments and compute scalarized and non-scalarized signatures
2865 void CompiledEntrySignature::compute_calling_conventions(bool init) {
2866 bool has_scalarized = false;
2867 if (_method != nullptr) {
2868 InstanceKlass* holder = _method->method_holder();
2869 int arg_num = 0;
2870 if (!_method->is_static()) {
2871 // We shouldn't scalarize 'this' in a value class constructor
2872 if (holder->is_inline_klass() && InlineKlass::cast(holder)->can_be_passed_as_fields() && !_method->is_object_constructor() &&
2873 (init || _method->is_scalarized_arg(arg_num))) {
2874 _sig_cc->appendAll(InlineKlass::cast(holder)->extended_sig());
2875 has_scalarized = true;
2876 _has_inline_recv = true;
2877 _num_inline_args++;
2878 } else {
2879 SigEntry::add_entry(_sig_cc, T_OBJECT, holder->name());
2880 }
2881 SigEntry::add_entry(_sig, T_OBJECT, holder->name());
2882 SigEntry::add_entry(_sig_cc_ro, T_OBJECT, holder->name());
2883 arg_num++;
2884 }
2885 for (SignatureStream ss(_method->signature()); !ss.at_return_type(); ss.next()) {
2886 BasicType bt = ss.type();
2887 if (bt == T_OBJECT) {
2888 InlineKlass* vk = ss.as_inline_klass(holder);
2889 if (vk != nullptr && vk->can_be_passed_as_fields() && (init || _method->is_scalarized_arg(arg_num))) {
2890 // Check for a calling convention mismatch with super method(s)
2891 bool scalar_super = false;
2892 bool non_scalar_super = false;
2893 GrowableArray<Method*>* supers = get_supers();
2894 for (int i = 0; i < supers->length(); ++i) {
2895 Method* super_method = supers->at(i);
2896 if (super_method->is_scalarized_arg(arg_num)) {
2897 scalar_super = true;
2898 } else {
2899 non_scalar_super = true;
2900 }
2901 }
2902 #ifdef ASSERT
2903 // Randomly enable below code paths for stress testing
2904 bool stress = init && StressCallingConvention;
2905 if (stress && (os::random() & 1) == 1) {
2906 non_scalar_super = true;
2907 if ((os::random() & 1) == 1) {
2908 scalar_super = true;
2909 }
2910 }
2911 #endif
2912 if (non_scalar_super) {
2913 // Found a super method with a non-scalarized argument. Fall back to the non-scalarized calling convention.
2914 if (scalar_super) {
2915 // Found non-scalar *and* scalar super methods. We can't handle both.
2916 // Mark the scalar method as mismatch and re-compile call sites to use non-scalarized calling convention.
2917 for (int i = 0; i < supers->length(); ++i) {
2918 Method* super_method = supers->at(i);
2919 if (super_method->is_scalarized_arg(arg_num) DEBUG_ONLY(|| (stress && (os::random() & 1) == 1))) {
2920 super_method->set_mismatch();
2921 MutexLocker ml(Compile_lock, Mutex::_safepoint_check_flag);
2922 JavaThread* thread = JavaThread::current();
2923 HandleMark hm(thread);
2924 methodHandle mh(thread, super_method);
2925 DeoptimizationScope deopt_scope;
2926 CodeCache::mark_for_deoptimization(&deopt_scope, mh());
2927 deopt_scope.deoptimize_marked();
2928 }
2929 }
2930 }
2931 // Fall back to non-scalarized calling convention
2932 SigEntry::add_entry(_sig_cc, T_OBJECT, ss.as_symbol());
2933 SigEntry::add_entry(_sig_cc_ro, T_OBJECT, ss.as_symbol());
2934 } else {
2935 _num_inline_args++;
2936 has_scalarized = true;
2937 int last = _sig_cc->length();
2938 int last_ro = _sig_cc_ro->length();
2939 _sig_cc->appendAll(vk->extended_sig());
2940 _sig_cc_ro->appendAll(vk->extended_sig());
2941 if (bt == T_OBJECT) {
2942 // Nullable inline type argument, insert InlineTypeNode::NullMarker field right after T_METADATA delimiter
2943 _sig_cc->insert_before(last+1, SigEntry(T_BOOLEAN, -1, nullptr, true));
2944 _sig_cc_ro->insert_before(last_ro+1, SigEntry(T_BOOLEAN, -1, nullptr, true));
2945 }
2946 }
2947 } else {
2948 SigEntry::add_entry(_sig_cc, T_OBJECT, ss.as_symbol());
2949 SigEntry::add_entry(_sig_cc_ro, T_OBJECT, ss.as_symbol());
2950 }
2951 bt = T_OBJECT;
2952 } else {
2953 SigEntry::add_entry(_sig_cc, ss.type(), ss.as_symbol());
2954 SigEntry::add_entry(_sig_cc_ro, ss.type(), ss.as_symbol());
2955 }
2956 SigEntry::add_entry(_sig, bt, ss.as_symbol());
2957 if (bt != T_VOID) {
2958 arg_num++;
2959 }
2960 }
2961 }
2962
2963 // Compute the non-scalarized calling convention
2964 _regs = NEW_RESOURCE_ARRAY(VMRegPair, _sig->length());
2965 _args_on_stack = SharedRuntime::java_calling_convention(_sig, _regs);
2966
2967 // Compute the scalarized calling conventions if there are scalarized inline types in the signature
2968 if (has_scalarized && !_method->is_native()) {
2969 _regs_cc = NEW_RESOURCE_ARRAY(VMRegPair, _sig_cc->length());
2970 _args_on_stack_cc = SharedRuntime::java_calling_convention(_sig_cc, _regs_cc);
2971
2972 _regs_cc_ro = NEW_RESOURCE_ARRAY(VMRegPair, _sig_cc_ro->length());
2973 _args_on_stack_cc_ro = SharedRuntime::java_calling_convention(_sig_cc_ro, _regs_cc_ro);
2974
2975 _c1_needs_stack_repair = (_args_on_stack_cc < _args_on_stack) || (_args_on_stack_cc_ro < _args_on_stack);
2976 _c2_needs_stack_repair = (_args_on_stack_cc > _args_on_stack) || (_args_on_stack_cc > _args_on_stack_cc_ro);
2977
2978 // Upper bound on stack arguments to avoid hitting the argument limit and
2979 // bailing out of compilation ("unsupported incoming calling sequence").
2980 // TODO we need a reasonable limit (flag?) here
2981 if (MAX2(_args_on_stack_cc, _args_on_stack_cc_ro) <= 60) {
2982 return; // Success
2983 }
2984 }
2985
2986 // No scalarized args
2987 _sig_cc = _sig;
2988 _regs_cc = _regs;
2989 _args_on_stack_cc = _args_on_stack;
2990
2991 _sig_cc_ro = _sig;
2992 _regs_cc_ro = _regs;
2993 _args_on_stack_cc_ro = _args_on_stack;
2994 }
2995
2996 void CompiledEntrySignature::initialize_from_fingerprint(AdapterFingerPrint* fingerprint) {
2997 int value_object_count = 0;
2998 bool is_receiver = true;
2999 BasicType prev_bt = T_ILLEGAL;
3000 bool long_prev = false;
3001 bool has_scalarized_arguments = false;
3002
3003 fingerprint->iterate_args([&] (int arg) {
3004 BasicType bt = (BasicType)arg;
3005 if (long_prev) {
3006 long_prev = false;
3007 BasicType bt_to_add;
3008 if (bt == T_VOID) {
3009 bt_to_add = T_LONG;
3010 } else {
3011 bt_to_add = T_OBJECT; // it could be T_ARRAY; it shouldn't matter
3012 }
3013 SigEntry::add_entry(_sig_cc, bt_to_add);
3014 SigEntry::add_entry(_sig_cc_ro, bt_to_add);
3015 if (value_object_count == 0) {
3016 SigEntry::add_entry(_sig, bt_to_add);
3017 }
3018 }
3019 switch (bt) {
3020 case T_VOID:
3021 if (is_receiver) {
3022 // 'this' when ro adapter is available
3023 assert(InlineTypePassFieldsAsArgs, "unexpected start of inline type");
3024 value_object_count++;
3025 has_scalarized_arguments = true;
3026 _has_inline_recv = true;
3027 SigEntry::add_entry(_sig, T_OBJECT);
3028 SigEntry::add_entry(_sig_cc, T_METADATA);
3029 SigEntry::add_entry(_sig_cc_ro, T_METADATA);
3030 } else if (prev_bt != T_LONG && prev_bt != T_DOUBLE) {
3031 assert(InlineTypePassFieldsAsArgs, "unexpected end of inline type");
3032 value_object_count--;
3033 SigEntry::add_entry(_sig_cc, T_VOID);
3034 SigEntry::add_entry(_sig_cc_ro, T_VOID);
3035 assert(value_object_count >= 0, "invalid value object count");
3036 } else {
3037 // Nothing to add for _sig: We already added an addition T_VOID in add_entry() when adding T_LONG or T_DOUBLE.
3038 }
3039 break;
3040 case T_INT:
3041 case T_FLOAT:
3042 case T_DOUBLE:
3043 if (value_object_count == 0) {
3044 SigEntry::add_entry(_sig, bt);
3045 }
3046 SigEntry::add_entry(_sig_cc, bt);
3047 SigEntry::add_entry(_sig_cc_ro, bt);
3048 break;
3049 case T_LONG:
3050 long_prev = true;
3051 break;
3052 case T_BOOLEAN:
3053 case T_CHAR:
3054 case T_BYTE:
3055 case T_SHORT:
3056 case T_OBJECT:
3057 case T_ARRAY:
3058 assert(value_object_count > 0 && !is_receiver, "must be value object field");
3059 SigEntry::add_entry(_sig_cc, bt);
3060 SigEntry::add_entry(_sig_cc_ro, bt);
3061 break;
3062 case T_METADATA:
3063 assert(InlineTypePassFieldsAsArgs, "unexpected start of inline type");
3064 value_object_count++;
3065 has_scalarized_arguments = true;
3066 SigEntry::add_entry(_sig, T_OBJECT);
3067 SigEntry::add_entry(_sig_cc, T_METADATA);
3068 SigEntry::add_entry(_sig_cc_ro, T_METADATA);
3069 break;
3070 default: {
3071 fatal("Unexpected BasicType: %s", basictype_to_str(bt));
3072 }
3073 }
3074 prev_bt = bt;
3075 is_receiver = false;
3076 });
3077
3078 if (long_prev) {
3079 // If previous bt was T_LONG and we reached the end of the signature, we know that it must be a T_OBJECT.
3080 SigEntry::add_entry(_sig, T_OBJECT);
3081 SigEntry::add_entry(_sig_cc, T_OBJECT);
3082 SigEntry::add_entry(_sig_cc_ro, T_OBJECT);
3083 }
3084 assert(value_object_count == 0, "invalid value object count");
3085
3086 _regs = NEW_RESOURCE_ARRAY(VMRegPair, _sig->length());
3087 _args_on_stack = SharedRuntime::java_calling_convention(_sig, _regs);
3088
3089 // Compute the scalarized calling conventions if there are scalarized inline types in the signature
3090 if (has_scalarized_arguments) {
3091 _regs_cc = NEW_RESOURCE_ARRAY(VMRegPair, _sig_cc->length());
3092 _args_on_stack_cc = SharedRuntime::java_calling_convention(_sig_cc, _regs_cc);
3093
3094 _regs_cc_ro = NEW_RESOURCE_ARRAY(VMRegPair, _sig_cc_ro->length());
3095 _args_on_stack_cc_ro = SharedRuntime::java_calling_convention(_sig_cc_ro, _regs_cc_ro);
3096
3097 _c1_needs_stack_repair = (_args_on_stack_cc < _args_on_stack) || (_args_on_stack_cc_ro < _args_on_stack);
3098 _c2_needs_stack_repair = (_args_on_stack_cc > _args_on_stack) || (_args_on_stack_cc > _args_on_stack_cc_ro);
3099 } else {
3100 // No scalarized args
3101 _sig_cc = _sig;
3102 _regs_cc = _regs;
3103 _args_on_stack_cc = _args_on_stack;
3104
3105 _sig_cc_ro = _sig;
3106 _regs_cc_ro = _regs;
3107 _args_on_stack_cc_ro = _args_on_stack;
3108 }
3109
3110 #ifdef ASSERT
3111 {
3112 AdapterFingerPrint* compare_fp = AdapterFingerPrint::allocate(_sig_cc, _has_inline_recv);
3113 assert(fingerprint->equals(compare_fp), "sanity check");
3114 AdapterFingerPrint::deallocate(compare_fp);
3115 }
3116 #endif
3117 }
3118
3119 const char* AdapterHandlerEntry::_entry_names[] = {
3120 "i2c", "c2i", "c2i_unverified", "c2i_no_clinit_check"
3121 };
3122
3123 #ifdef ASSERT
3124 void AdapterHandlerLibrary::verify_adapter_sharing(CompiledEntrySignature& ces, AdapterHandlerEntry* cached_entry) {
3125 // we can only check for the same code if there is any
3126 #ifndef ZERO
3127 AdapterBlob* comparison_blob = nullptr;
3128 AdapterHandlerEntry* comparison_entry = create_adapter(comparison_blob, ces, false, true);
3129 assert(comparison_blob == nullptr, "no blob should be created when creating an adapter for comparison");
3130 assert(comparison_entry->compare_code(cached_entry), "code must match");
3131 // Release the one just created
3132 AdapterHandlerEntry::deallocate(comparison_entry);
3133 # endif // ZERO
3134 }
3135 #endif /* ASSERT*/
3136
3137 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) {
3138 // Use customized signature handler. Need to lock around updates to
3139 // the _adapter_handler_table (it is not safe for concurrent readers
3140 // and a single writer: this could be fixed if it becomes a
3141 // problem).
3142
3143 // Fast-path for trivial adapters
3144 AdapterHandlerEntry* entry = get_simple_adapter(method);
3145 if (entry != nullptr) {
3146 return entry;
3147 }
3148
3149 ResourceMark rm;
3150 AdapterBlob* adapter_blob = nullptr;
3151
3152 CompiledEntrySignature ces(method());
3153 ces.compute_calling_conventions();
3154 if (ces.has_scalarized_args()) {
3155 if (!method->has_scalarized_args()) {
3156 method->set_has_scalarized_args();
3157 }
3158 if (ces.c1_needs_stack_repair()) {
3159 method->set_c1_needs_stack_repair();
3160 }
3161 if (ces.c2_needs_stack_repair() && !method->c2_needs_stack_repair()) {
3162 method->set_c2_needs_stack_repair();
3163 }
3164 } else if (method->is_abstract()) {
3165 return _abstract_method_handler;
3166 }
3167
3168 {
3169 MutexLocker mu(AdapterHandlerLibrary_lock);
3170
3171 if (ces.has_scalarized_args() && method->is_abstract()) {
3172 // Save a C heap allocated version of the signature for abstract methods with scalarized inline type arguments
3173 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
3174 entry = AdapterHandlerLibrary::new_entry(AdapterFingerPrint::allocate(nullptr));
3175 entry->set_entry_points(SharedRuntime::throw_AbstractMethodError_entry(),
3176 wrong_method_abstract, wrong_method_abstract, wrong_method_abstract,
3177 wrong_method_abstract, wrong_method_abstract);
3178 GrowableArray<SigEntry>* heap_sig = new (mtInternal) GrowableArray<SigEntry>(ces.sig_cc_ro()->length(), mtInternal);
3179 heap_sig->appendAll(ces.sig_cc_ro());
3180 entry->set_sig_cc(heap_sig);
3181 return entry;
3182 }
3183
3184 // Lookup method signature's fingerprint
3185 entry = lookup(ces.sig_cc(), ces.has_inline_recv());
3186
3187 if (entry != nullptr) {
3188 assert(entry->is_linked(), "AdapterHandlerEntry must have been linked");
3189 #ifdef ASSERT
3190 if (!entry->is_shared() && VerifyAdapterSharing) {
3191 verify_adapter_sharing(ces, entry);
3192 }
3193 #endif
3194 } else {
3195 entry = create_adapter(adapter_blob, ces, /* allocate_code_blob */ true);
3196 }
3197 }
3198
3199 // Outside of the lock
3200 if (adapter_blob != nullptr) {
3201 post_adapter_creation(adapter_blob, entry);
3202 }
3203 return entry;
3204 }
3205
3206 AdapterBlob* AdapterHandlerLibrary::lookup_aot_cache(AdapterHandlerEntry* handler) {
3207 ResourceMark rm;
3208 const char* name = AdapterHandlerLibrary::name(handler->fingerprint());
3209 const uint32_t id = AdapterHandlerLibrary::id(handler->fingerprint());
3210 int offsets[AdapterBlob::ENTRY_COUNT];
3211
3212 AdapterBlob* adapter_blob = nullptr;
3213 CodeBlob* blob = AOTCodeCache::load_code_blob(AOTCodeEntry::Adapter, id, name);
3214 if (blob != nullptr) {
3215 adapter_blob = blob->as_adapter_blob();
3216 adapter_blob->get_offsets(offsets);
3217 address i2c_entry = adapter_blob->content_begin();
3218 assert(offsets[0] == 0, "sanity check");
3219 handler->set_entry_points(
3220 i2c_entry,
3221 (offsets[1] != -1) ? (i2c_entry + offsets[1]) : nullptr,
3222 (offsets[2] != -1) ? (i2c_entry + offsets[2]) : nullptr,
3223 (offsets[3] != -1) ? (i2c_entry + offsets[3]) : nullptr,
3224 (offsets[4] != -1) ? (i2c_entry + offsets[4]) : nullptr,
3225 (offsets[5] != -1) ? (i2c_entry + offsets[5]) : nullptr,
3226 (offsets[6] != -1) ? (i2c_entry + offsets[6]) : nullptr
3227 );
3228 }
3229 return adapter_blob;
3230 }
3231
3232 #ifndef PRODUCT
3233 void AdapterHandlerLibrary::print_adapter_handler_info(outputStream* st, AdapterHandlerEntry* handler, AdapterBlob* adapter_blob) {
3234 ttyLocker ttyl;
3235 ResourceMark rm;
3236 int insts_size;
3237 // on Zero the blob may be null
3238 handler->print_adapter_on(tty);
3239 if (adapter_blob == nullptr) {
3240 return;
3241 }
3242 insts_size = adapter_blob->code_size();
3243 st->print_cr("i2c argument handler for: %s %s (%d bytes generated)",
3244 handler->fingerprint()->as_basic_args_string(),
3245 handler->fingerprint()->as_string(), insts_size);
3246 st->print_cr("c2i argument handler starts at " INTPTR_FORMAT, p2i(handler->get_c2i_entry()));
3247 if (Verbose || PrintStubCode) {
3248 address first_pc = handler->base_address();
3249 if (first_pc != nullptr) {
3250 Disassembler::decode(first_pc, first_pc + insts_size, st, &adapter_blob->asm_remarks());
3251 st->cr();
3252 }
3253 }
3254 }
3255 #endif // PRODUCT
3256
3257 bool AdapterHandlerLibrary::generate_adapter_code(AdapterBlob*& adapter_blob,
3258 AdapterHandlerEntry* handler,
3259 CompiledEntrySignature& ces,
3260 bool allocate_code_blob,
3261 bool is_transient) {
3262 if (log_is_enabled(Info, perf, class, link)) {
3263 ClassLoader::perf_method_adapters_count()->inc();
3264 }
3265
3266 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
3267 CodeBuffer buffer(buf);
3268 short buffer_locs[20];
3269 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
3270 sizeof(buffer_locs)/sizeof(relocInfo));
3271 MacroAssembler masm(&buffer);
3272
3273 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
3274 SharedRuntime::generate_i2c2i_adapters(&masm,
3275 ces.args_on_stack(),
3276 ces.sig(),
3277 ces.regs(),
3278 ces.sig_cc(),
3279 ces.regs_cc(),
3280 ces.sig_cc_ro(),
3281 ces.regs_cc_ro(),
3282 handler,
3283 adapter_blob,
3284 allocate_code_blob);
3285
3286 if (ces.has_scalarized_args()) {
3287 // Save a C heap allocated version of the scalarized signature and store it in the adapter
3288 GrowableArray<SigEntry>* heap_sig = new (mtInternal) GrowableArray<SigEntry>(ces.sig_cc()->length(), mtInternal);
3289 heap_sig->appendAll(ces.sig_cc());
3290 handler->set_sig_cc(heap_sig);
3291 }
3292 #ifdef ZERO
3293 // On zero there is no code to save and no need to create a blob and
3294 // or relocate the handler.
3295 adapter_blob = nullptr;
3296 #else
3297 #ifdef ASSERT
3298 if (VerifyAdapterSharing) {
3299 handler->save_code(buf->code_begin(), buffer.insts_size());
3300 if (is_transient) {
3301 return true;
3302 }
3303 }
3304 #endif
3305
3306 if (adapter_blob == nullptr) {
3307 // CodeCache is full, disable compilation
3308 // Ought to log this but compile log is only per compile thread
3309 // and we're some non descript Java thread.
3310 return false;
3311 }
3312 if (!is_transient && AOTCodeCache::is_dumping_adapter()) {
3313 // try to save generated code
3314 const char* name = AdapterHandlerLibrary::name(handler->fingerprint());
3315 const uint32_t id = AdapterHandlerLibrary::id(handler->fingerprint());
3316 bool success = AOTCodeCache::store_code_blob(*adapter_blob, AOTCodeEntry::Adapter, id, name);
3317 assert(success || !AOTCodeCache::is_dumping_adapter(), "caching of adapter must be disabled");
3318 }
3319 handler->relocate(adapter_blob->content_begin());
3320 #endif // ZERO
3321
3322 #ifndef PRODUCT
3323 // debugging support
3324 if (PrintAdapterHandlers || PrintStubCode) {
3325 print_adapter_handler_info(tty, handler, adapter_blob);
3326 }
3327 #endif
3328
3329 return true;
3330 }
3331
3332 AdapterHandlerEntry* AdapterHandlerLibrary::create_adapter(AdapterBlob*& adapter_blob,
3333 CompiledEntrySignature& ces,
3334 bool allocate_code_blob,
3335 bool is_transient) {
3336 AdapterFingerPrint* fp = AdapterFingerPrint::allocate(ces.sig_cc(), ces.has_inline_recv());
3337 #ifdef ASSERT
3338 // Verify that we can successfully restore the compiled entry signature object.
3339 CompiledEntrySignature ces_verify;
3340 ces_verify.initialize_from_fingerprint(fp);
3341 #endif
3342 AdapterHandlerEntry* handler = AdapterHandlerLibrary::new_entry(fp);
3343 if (!generate_adapter_code(adapter_blob, handler, ces, allocate_code_blob, is_transient)) {
3344 AdapterHandlerEntry::deallocate(handler);
3345 return nullptr;
3346 }
3347 if (!is_transient) {
3348 assert_lock_strong(AdapterHandlerLibrary_lock);
3349 _adapter_handler_table->put(fp, handler);
3350 }
3351 return handler;
3352 }
3353
3354 #if INCLUDE_CDS
3355 void AdapterHandlerEntry::remove_unshareable_info() {
3356 #ifdef ASSERT
3357 _saved_code = nullptr;
3358 _saved_code_length = 0;
3359 #endif // ASSERT
3360 set_entry_points(nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, false);
3361 }
3362
3363 class CopyAdapterTableToArchive : StackObj {
3364 private:
3365 CompactHashtableWriter* _writer;
3366 ArchiveBuilder* _builder;
3367 public:
3368 CopyAdapterTableToArchive(CompactHashtableWriter* writer) : _writer(writer),
3369 _builder(ArchiveBuilder::current())
3370 {}
3371
3372 bool do_entry(AdapterFingerPrint* fp, AdapterHandlerEntry* entry) {
3373 LogStreamHandle(Trace, aot) lsh;
3374 if (ArchiveBuilder::current()->has_been_archived((address)entry)) {
3375 assert(ArchiveBuilder::current()->has_been_archived((address)fp), "must be");
3376 AdapterFingerPrint* buffered_fp = ArchiveBuilder::current()->get_buffered_addr(fp);
3377 assert(buffered_fp != nullptr,"sanity check");
3378 AdapterHandlerEntry* buffered_entry = ArchiveBuilder::current()->get_buffered_addr(entry);
3379 assert(buffered_entry != nullptr,"sanity check");
3380
3381 uint hash = fp->compute_hash();
3382 u4 delta = _builder->buffer_to_offset_u4((address)buffered_entry);
3383 _writer->add(hash, delta);
3384 if (lsh.is_enabled()) {
3385 address fp_runtime_addr = (address)buffered_fp + ArchiveBuilder::current()->buffer_to_requested_delta();
3386 address entry_runtime_addr = (address)buffered_entry + ArchiveBuilder::current()->buffer_to_requested_delta();
3387 log_trace(aot)("Added fp=%p (%s), entry=%p to the archived adater table", buffered_fp, buffered_fp->as_basic_args_string(), buffered_entry);
3388 }
3389 } else {
3390 if (lsh.is_enabled()) {
3391 log_trace(aot)("Skipping adapter handler %p (fp=%s) as it is not archived", entry, fp->as_basic_args_string());
3392 }
3393 }
3394 return true;
3395 }
3396 };
3397
3398 void AdapterHandlerLibrary::dump_aot_adapter_table() {
3399 CompactHashtableStats stats;
3400 CompactHashtableWriter writer(_adapter_handler_table->number_of_entries(), &stats);
3401 CopyAdapterTableToArchive copy(&writer);
3402 _adapter_handler_table->iterate(©);
3403 writer.dump(&_aot_adapter_handler_table, "archived adapter table");
3404 }
3405
3406 void AdapterHandlerLibrary::serialize_shared_table_header(SerializeClosure* soc) {
3407 _aot_adapter_handler_table.serialize_header(soc);
3408 }
3409
3410 AdapterBlob* AdapterHandlerLibrary::link_aot_adapter_handler(AdapterHandlerEntry* handler) {
3411 #ifdef ASSERT
3412 if (TestAOTAdapterLinkFailure) {
3413 return nullptr;
3414 }
3415 #endif
3416 AdapterBlob* blob = lookup_aot_cache(handler);
3417 #ifndef PRODUCT
3418 // debugging support
3419 if ((blob != nullptr) && (PrintAdapterHandlers || PrintStubCode)) {
3420 print_adapter_handler_info(tty, handler, blob);
3421 }
3422 #endif
3423 return blob;
3424 }
3425
3426 // This method is used during production run to link archived adapters (stored in AOT Cache)
3427 // to their code in AOT Code Cache
3428 void AdapterHandlerEntry::link() {
3429 AdapterBlob* adapter_blob = nullptr;
3430 ResourceMark rm;
3431 assert(_fingerprint != nullptr, "_fingerprint must not be null");
3432 bool generate_code = false;
3433 // Generate code only if AOTCodeCache is not available, or
3434 // caching adapters is disabled, or we fail to link
3435 // the AdapterHandlerEntry to its code in the AOTCodeCache
3436 if (AOTCodeCache::is_using_adapter()) {
3437 adapter_blob = AdapterHandlerLibrary::link_aot_adapter_handler(this);
3438 if (adapter_blob == nullptr) {
3439 log_warning(aot)("Failed to link AdapterHandlerEntry (fp=%s) to its code in the AOT code cache", _fingerprint->as_basic_args_string());
3440 generate_code = true;
3441 }
3442 } else {
3443 generate_code = true;
3444 }
3445 if (generate_code) {
3446 CompiledEntrySignature ces;
3447 ces.initialize_from_fingerprint(_fingerprint);
3448 if (!AdapterHandlerLibrary::generate_adapter_code(adapter_blob, this, ces, true, false)) {
3449 // Don't throw exceptions during VM initialization because java.lang.* classes
3450 // might not have been initialized, causing problems when constructing the
3451 // Java exception object.
3452 vm_exit_during_initialization("Out of space in CodeCache for adapters");
3453 }
3454 }
3455 // Outside of the lock
3456 if (adapter_blob != nullptr) {
3457 post_adapter_creation(adapter_blob, this);
3458 }
3459 assert(_linked, "AdapterHandlerEntry must now be linked");
3460 }
3461
3462 void AdapterHandlerLibrary::link_aot_adapters() {
3463 assert(AOTCodeCache::is_using_adapter(), "AOT adapters code should be available");
3464 _aot_adapter_handler_table.iterate([](AdapterHandlerEntry* entry) {
3465 assert(!entry->is_linked(), "AdapterHandlerEntry is already linked!");
3466 entry->link();
3467 });
3468 }
3469
3470 // This method is called during production run to lookup simple adapters
3471 // in the archived adapter handler table
3472 void AdapterHandlerLibrary::lookup_simple_adapters() {
3473 assert(!_aot_adapter_handler_table.empty(), "archived adapter handler table is empty");
3474
3475 MutexLocker mu(AdapterHandlerLibrary_lock);
3476 ResourceMark rm;
3477 CompiledEntrySignature no_args;
3478 no_args.compute_calling_conventions();
3479 _no_arg_handler = lookup(no_args.sig_cc(), no_args.has_inline_recv());
3480
3481 CompiledEntrySignature obj_args;
3482 SigEntry::add_entry(obj_args.sig(), T_OBJECT);
3483 obj_args.compute_calling_conventions();
3484 _obj_arg_handler = lookup(obj_args.sig_cc(), obj_args.has_inline_recv());
3485
3486 CompiledEntrySignature int_args;
3487 SigEntry::add_entry(int_args.sig(), T_INT);
3488 int_args.compute_calling_conventions();
3489 _int_arg_handler = lookup(int_args.sig_cc(), int_args.has_inline_recv());
3490
3491 CompiledEntrySignature obj_int_args;
3492 SigEntry::add_entry(obj_int_args.sig(), T_OBJECT);
3493 SigEntry::add_entry(obj_int_args.sig(), T_INT);
3494 obj_int_args.compute_calling_conventions();
3495 _obj_int_arg_handler = lookup(obj_int_args.sig_cc(), obj_int_args.has_inline_recv());
3496
3497 CompiledEntrySignature obj_obj_args;
3498 SigEntry::add_entry(obj_obj_args.sig(), T_OBJECT);
3499 SigEntry::add_entry(obj_obj_args.sig(), T_OBJECT);
3500 obj_obj_args.compute_calling_conventions();
3501 _obj_obj_arg_handler = lookup(obj_obj_args.sig_cc(), obj_obj_args.has_inline_recv());
3502
3503 assert(_no_arg_handler != nullptr &&
3504 _obj_arg_handler != nullptr &&
3505 _int_arg_handler != nullptr &&
3506 _obj_int_arg_handler != nullptr &&
3507 _obj_obj_arg_handler != nullptr, "Initial adapters not found in archived adapter handler table");
3508 assert(_no_arg_handler->is_linked() &&
3509 _obj_arg_handler->is_linked() &&
3510 _int_arg_handler->is_linked() &&
3511 _obj_int_arg_handler->is_linked() &&
3512 _obj_obj_arg_handler->is_linked(), "Initial adapters not in linked state");
3513 }
3514 #endif // INCLUDE_CDS
3515
3516 address AdapterHandlerEntry::base_address() {
3517 address base = _i2c_entry;
3518 if (base == nullptr) base = _c2i_entry;
3519 assert(base <= _c2i_entry || _c2i_entry == nullptr, "");
3520 assert(base <= _c2i_inline_entry || _c2i_inline_entry == nullptr, "");
3521 assert(base <= _c2i_inline_ro_entry || _c2i_inline_ro_entry == nullptr, "");
3522 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == nullptr, "");
3523 assert(base <= _c2i_unverified_inline_entry || _c2i_unverified_inline_entry == nullptr, "");
3524 assert(base <= _c2i_no_clinit_check_entry || _c2i_no_clinit_check_entry == nullptr, "");
3525 return base;
3526 }
3527
3528 void AdapterHandlerEntry::relocate(address new_base) {
3529 address old_base = base_address();
3530 assert(old_base != nullptr, "");
3531 ptrdiff_t delta = new_base - old_base;
3532 if (_i2c_entry != nullptr)
3533 _i2c_entry += delta;
3534 if (_c2i_entry != nullptr)
3535 _c2i_entry += delta;
3536 if (_c2i_inline_entry != nullptr)
3537 _c2i_inline_entry += delta;
3538 if (_c2i_inline_ro_entry != nullptr)
3539 _c2i_inline_ro_entry += delta;
3540 if (_c2i_unverified_entry != nullptr)
3541 _c2i_unverified_entry += delta;
3542 if (_c2i_unverified_inline_entry != nullptr)
3543 _c2i_unverified_inline_entry += delta;
3544 if (_c2i_no_clinit_check_entry != nullptr)
3545 _c2i_no_clinit_check_entry += delta;
3546 assert(base_address() == new_base, "");
3547 }
3548
3549 void AdapterHandlerEntry::metaspace_pointers_do(MetaspaceClosure* it) {
3550 LogStreamHandle(Trace, aot) lsh;
3551 if (lsh.is_enabled()) {
3552 lsh.print("Iter(AdapterHandlerEntry): %p(%s)", this, _fingerprint->as_basic_args_string());
3553 lsh.cr();
3554 }
3555 it->push(&_fingerprint);
3556 }
3557
3558 AdapterHandlerEntry::~AdapterHandlerEntry() {
3559 if (_fingerprint != nullptr) {
3560 AdapterFingerPrint::deallocate(_fingerprint);
3561 _fingerprint = nullptr;
3562 }
3563 if (_sig_cc != nullptr) {
3564 delete _sig_cc;
3565 }
3566 #ifdef ASSERT
3567 FREE_C_HEAP_ARRAY(unsigned char, _saved_code);
3568 #endif
3569 FreeHeap(this);
3570 }
3571
3572
3573 #ifdef ASSERT
3574 // Capture the code before relocation so that it can be compared
3575 // against other versions. If the code is captured after relocation
3576 // then relative instructions won't be equivalent.
3577 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
3578 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
3579 _saved_code_length = length;
3580 memcpy(_saved_code, buffer, length);
3581 }
3582
3583
3584 bool AdapterHandlerEntry::compare_code(AdapterHandlerEntry* other) {
3585 assert(_saved_code != nullptr && other->_saved_code != nullptr, "code not saved");
3586
3587 if (other->_saved_code_length != _saved_code_length) {
3588 return false;
3589 }
3590
3591 return memcmp(other->_saved_code, _saved_code, _saved_code_length) == 0;
3592 }
3593 #endif
3594
3595
3596 /**
3597 * Create a native wrapper for this native method. The wrapper converts the
3598 * Java-compiled calling convention to the native convention, handles
3599 * arguments, and transitions to native. On return from the native we transition
3600 * back to java blocking if a safepoint is in progress.
3601 */
3602 void AdapterHandlerLibrary::create_native_wrapper(const methodHandle& method) {
3603 ResourceMark rm;
3604 nmethod* nm = nullptr;
3605
3606 // Check if memory should be freed before allocation
3607 CodeCache::gc_on_allocation();
3608
3609 assert(method->is_native(), "must be native");
3610 assert(method->is_special_native_intrinsic() ||
3611 method->has_native_function(), "must have something valid to call!");
3612
3613 {
3614 // Perform the work while holding the lock, but perform any printing outside the lock
3615 MutexLocker mu(AdapterHandlerLibrary_lock);
3616 // See if somebody beat us to it
3617 if (method->code() != nullptr) {
3618 return;
3619 }
3620
3621 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci);
3622 assert(compile_id > 0, "Must generate native wrapper");
3623
3624
3625 ResourceMark rm;
3626 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
3627 if (buf != nullptr) {
3628 CodeBuffer buffer(buf);
3629
3630 if (method->is_continuation_enter_intrinsic()) {
3631 buffer.initialize_stubs_size(192);
3632 }
3633
3634 struct { double data[20]; } locs_buf;
3635 struct { double data[20]; } stubs_locs_buf;
3636 buffer.insts()->initialize_shared_locs((relocInfo*)&locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
3637 #if defined(AARCH64) || defined(PPC64)
3638 // On AArch64 with ZGC and nmethod entry barriers, we need all oops to be
3639 // in the constant pool to ensure ordering between the barrier and oops
3640 // accesses. For native_wrappers we need a constant.
3641 // On PPC64 the continuation enter intrinsic needs the constant pool for the compiled
3642 // static java call that is resolved in the runtime.
3643 if (PPC64_ONLY(method->is_continuation_enter_intrinsic() &&) true) {
3644 buffer.initialize_consts_size(8 PPC64_ONLY(+ 24));
3645 }
3646 #endif
3647 buffer.stubs()->initialize_shared_locs((relocInfo*)&stubs_locs_buf, sizeof(stubs_locs_buf) / sizeof(relocInfo));
3648 MacroAssembler _masm(&buffer);
3649
3650 // Fill in the signature array, for the calling-convention call.
3651 const int total_args_passed = method->size_of_parameters();
3652
3653 BasicType stack_sig_bt[16];
3654 VMRegPair stack_regs[16];
3655 BasicType* sig_bt = (total_args_passed <= 16) ? stack_sig_bt : NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
3656 VMRegPair* regs = (total_args_passed <= 16) ? stack_regs : NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
3657
3658 int i = 0;
3659 if (!method->is_static()) { // Pass in receiver first
3660 sig_bt[i++] = T_OBJECT;
3661 }
3662 SignatureStream ss(method->signature());
3663 for (; !ss.at_return_type(); ss.next()) {
3664 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
3665 if (ss.type() == T_LONG || ss.type() == T_DOUBLE) {
3666 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
3667 }
3668 }
3669 assert(i == total_args_passed, "");
3670 BasicType ret_type = ss.type();
3671
3672 // Now get the compiled-Java arguments layout.
3673 SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed);
3674
3675 // Generate the compiled-to-native wrapper code
3676 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type);
3677
3678 if (nm != nullptr) {
3679 {
3680 MutexLocker pl(NMethodState_lock, Mutex::_no_safepoint_check_flag);
3681 if (nm->make_in_use()) {
3682 method->set_code(method, nm);
3683 }
3684 }
3685
3686 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, CompileBroker::compiler(CompLevel_simple));
3687 if (directive->PrintAssemblyOption) {
3688 nm->print_code();
3689 }
3690 DirectivesStack::release(directive);
3691 }
3692 }
3693 } // Unlock AdapterHandlerLibrary_lock
3694
3695
3696 // Install the generated code.
3697 if (nm != nullptr) {
3698 const char *msg = method->is_static() ? "(static)" : "";
3699 CompileTask::print_ul(nm, msg);
3700 if (PrintCompilation) {
3701 ttyLocker ttyl;
3702 CompileTask::print(tty, nm, msg);
3703 }
3704 nm->post_compiled_method_load_event();
3705 }
3706 }
3707
3708 // -------------------------------------------------------------------------
3709 // Java-Java calling convention
3710 // (what you use when Java calls Java)
3711
3712 //------------------------------name_for_receiver----------------------------------
3713 // For a given signature, return the VMReg for parameter 0.
3714 VMReg SharedRuntime::name_for_receiver() {
3715 VMRegPair regs;
3716 BasicType sig_bt = T_OBJECT;
3717 (void) java_calling_convention(&sig_bt, ®s, 1);
3718 // Return argument 0 register. In the LP64 build pointers
3719 // take 2 registers, but the VM wants only the 'main' name.
3720 return regs.first();
3721 }
3722
3723 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) {
3724 // This method is returning a data structure allocating as a
3725 // ResourceObject, so do not put any ResourceMarks in here.
3726
3727 BasicType *sig_bt = NEW_RESOURCE_ARRAY(BasicType, 256);
3728 VMRegPair *regs = NEW_RESOURCE_ARRAY(VMRegPair, 256);
3729 int cnt = 0;
3730 if (has_receiver) {
3731 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature
3732 }
3733
3734 for (SignatureStream ss(sig); !ss.at_return_type(); ss.next()) {
3735 BasicType type = ss.type();
3736 sig_bt[cnt++] = type;
3737 if (is_double_word_type(type))
3738 sig_bt[cnt++] = T_VOID;
3739 }
3740
3741 if (has_appendix) {
3742 sig_bt[cnt++] = T_OBJECT;
3743 }
3744
3745 assert(cnt < 256, "grow table size");
3746
3747 int comp_args_on_stack;
3748 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt);
3749
3750 // the calling convention doesn't count out_preserve_stack_slots so
3751 // we must add that in to get "true" stack offsets.
3752
3753 if (comp_args_on_stack) {
3754 for (int i = 0; i < cnt; i++) {
3755 VMReg reg1 = regs[i].first();
3756 if (reg1->is_stack()) {
3757 // Yuck
3758 reg1 = reg1->bias(out_preserve_stack_slots());
3759 }
3760 VMReg reg2 = regs[i].second();
3761 if (reg2->is_stack()) {
3762 // Yuck
3763 reg2 = reg2->bias(out_preserve_stack_slots());
3764 }
3765 regs[i].set_pair(reg2, reg1);
3766 }
3767 }
3768
3769 // results
3770 *arg_size = cnt;
3771 return regs;
3772 }
3773
3774 // OSR Migration Code
3775 //
3776 // This code is used convert interpreter frames into compiled frames. It is
3777 // called from very start of a compiled OSR nmethod. A temp array is
3778 // allocated to hold the interesting bits of the interpreter frame. All
3779 // active locks are inflated to allow them to move. The displaced headers and
3780 // active interpreter locals are copied into the temp buffer. Then we return
3781 // back to the compiled code. The compiled code then pops the current
3782 // interpreter frame off the stack and pushes a new compiled frame. Then it
3783 // copies the interpreter locals and displaced headers where it wants.
3784 // Finally it calls back to free the temp buffer.
3785 //
3786 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed.
3787
3788 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *current) )
3789 assert(current == JavaThread::current(), "pre-condition");
3790 JFR_ONLY(Jfr::check_and_process_sample_request(current);)
3791 // During OSR migration, we unwind the interpreted frame and replace it with a compiled
3792 // frame. The stack watermark code below ensures that the interpreted frame is processed
3793 // before it gets unwound. This is helpful as the size of the compiled frame could be
3794 // larger than the interpreted frame, which could result in the new frame not being
3795 // processed correctly.
3796 StackWatermarkSet::before_unwind(current);
3797
3798 //
3799 // This code is dependent on the memory layout of the interpreter local
3800 // array and the monitors. On all of our platforms the layout is identical
3801 // so this code is shared. If some platform lays the their arrays out
3802 // differently then this code could move to platform specific code or
3803 // the code here could be modified to copy items one at a time using
3804 // frame accessor methods and be platform independent.
3805
3806 frame fr = current->last_frame();
3807 assert(fr.is_interpreted_frame(), "");
3808 assert(fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks");
3809
3810 // Figure out how many monitors are active.
3811 int active_monitor_count = 0;
3812 for (BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
3813 kptr < fr.interpreter_frame_monitor_begin();
3814 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
3815 if (kptr->obj() != nullptr) active_monitor_count++;
3816 }
3817
3818 // QQQ we could place number of active monitors in the array so that compiled code
3819 // could double check it.
3820
3821 Method* moop = fr.interpreter_frame_method();
3822 int max_locals = moop->max_locals();
3823 // Allocate temp buffer, 1 word per local & 2 per active monitor
3824 int buf_size_words = max_locals + active_monitor_count * BasicObjectLock::size();
3825 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode);
3826
3827 // Copy the locals. Order is preserved so that loading of longs works.
3828 // Since there's no GC I can copy the oops blindly.
3829 assert(sizeof(HeapWord)==sizeof(intptr_t), "fix this code");
3830 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
3831 (HeapWord*)&buf[0],
3832 max_locals);
3833
3834 // Inflate locks. Copy the displaced headers. Be careful, there can be holes.
3835 int i = max_locals;
3836 for (BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();
3837 kptr2 < fr.interpreter_frame_monitor_begin();
3838 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {
3839 if (kptr2->obj() != nullptr) { // Avoid 'holes' in the monitor array
3840 BasicLock *lock = kptr2->lock();
3841 if (LockingMode == LM_LEGACY) {
3842 // Inflate so the object's header no longer refers to the BasicLock.
3843 if (lock->displaced_header().is_unlocked()) {
3844 // The object is locked and the resulting ObjectMonitor* will also be
3845 // locked so it can't be async deflated until ownership is dropped.
3846 // See the big comment in basicLock.cpp: BasicLock::move_to().
3847 ObjectSynchronizer::inflate_helper(kptr2->obj());
3848 }
3849 // Now the displaced header is free to move because the
3850 // object's header no longer refers to it.
3851 buf[i] = (intptr_t)lock->displaced_header().value();
3852 } else if (UseObjectMonitorTable) {
3853 buf[i] = (intptr_t)lock->object_monitor_cache();
3854 }
3855 #ifdef ASSERT
3856 else {
3857 buf[i] = badDispHeaderOSR;
3858 }
3859 #endif
3860 i++;
3861 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj());
3862 }
3863 }
3864 assert(i - max_locals == active_monitor_count*2, "found the expected number of monitors");
3865
3866 RegisterMap map(current,
3867 RegisterMap::UpdateMap::skip,
3868 RegisterMap::ProcessFrames::include,
3869 RegisterMap::WalkContinuation::skip);
3870 frame sender = fr.sender(&map);
3871 if (sender.is_interpreted_frame()) {
3872 current->push_cont_fastpath(sender.sp());
3873 }
3874
3875 return buf;
3876 JRT_END
3877
3878 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) )
3879 FREE_C_HEAP_ARRAY(intptr_t, buf);
3880 JRT_END
3881
3882 bool AdapterHandlerLibrary::contains(const CodeBlob* b) {
3883 bool found = false;
3884 #if INCLUDE_CDS
3885 if (AOTCodeCache::is_using_adapter()) {
3886 auto findblob_archived_table = [&] (AdapterHandlerEntry* handler) {
3887 return (found = (b == CodeCache::find_blob(handler->get_i2c_entry())));
3888 };
3889 _aot_adapter_handler_table.iterate(findblob_archived_table);
3890 }
3891 #endif // INCLUDE_CDS
3892 if (!found) {
3893 auto findblob_runtime_table = [&] (AdapterFingerPrint* key, AdapterHandlerEntry* a) {
3894 return (found = (b == CodeCache::find_blob(a->get_i2c_entry())));
3895 };
3896 assert_locked_or_safepoint(AdapterHandlerLibrary_lock);
3897 _adapter_handler_table->iterate(findblob_runtime_table);
3898 }
3899 return found;
3900 }
3901
3902 const char* AdapterHandlerLibrary::name(AdapterFingerPrint* fingerprint) {
3903 return fingerprint->as_basic_args_string();
3904 }
3905
3906 uint32_t AdapterHandlerLibrary::id(AdapterFingerPrint* fingerprint) {
3907 unsigned int hash = fingerprint->compute_hash();
3908 return hash;
3909 }
3910
3911 void AdapterHandlerLibrary::print_handler_on(outputStream* st, const CodeBlob* b) {
3912 bool found = false;
3913 #if INCLUDE_CDS
3914 if (AOTCodeCache::is_using_adapter()) {
3915 auto findblob_archived_table = [&] (AdapterHandlerEntry* handler) {
3916 if (b == CodeCache::find_blob(handler->get_i2c_entry())) {
3917 found = true;
3918 st->print("Adapter for signature: ");
3919 handler->print_adapter_on(st);
3920 return true;
3921 } else {
3922 return false; // keep looking
3923 }
3924 };
3925 _aot_adapter_handler_table.iterate(findblob_archived_table);
3926 }
3927 #endif // INCLUDE_CDS
3928 if (!found) {
3929 auto findblob_runtime_table = [&] (AdapterFingerPrint* key, AdapterHandlerEntry* a) {
3930 if (b == CodeCache::find_blob(a->get_i2c_entry())) {
3931 found = true;
3932 st->print("Adapter for signature: ");
3933 a->print_adapter_on(st);
3934 return true;
3935 } else {
3936 return false; // keep looking
3937 }
3938 };
3939 assert_locked_or_safepoint(AdapterHandlerLibrary_lock);
3940 _adapter_handler_table->iterate(findblob_runtime_table);
3941 }
3942 assert(found, "Should have found handler");
3943 }
3944
3945 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
3946 st->print("AHE@" INTPTR_FORMAT ": %s", p2i(this), fingerprint()->as_string());
3947 if (get_i2c_entry() != nullptr) {
3948 st->print(" i2c: " INTPTR_FORMAT, p2i(get_i2c_entry()));
3949 }
3950 if (get_c2i_entry() != nullptr) {
3951 st->print(" c2i: " INTPTR_FORMAT, p2i(get_c2i_entry()));
3952 }
3953 if (get_c2i_entry() != nullptr) {
3954 st->print(" c2iVE: " INTPTR_FORMAT, p2i(get_c2i_inline_entry()));
3955 }
3956 if (get_c2i_entry() != nullptr) {
3957 st->print(" c2iVROE: " INTPTR_FORMAT, p2i(get_c2i_inline_ro_entry()));
3958 }
3959 if (get_c2i_unverified_entry() != nullptr) {
3960 st->print(" c2iUE: " INTPTR_FORMAT, p2i(get_c2i_unverified_entry()));
3961 }
3962 if (get_c2i_unverified_entry() != nullptr) {
3963 st->print(" c2iUVE: " INTPTR_FORMAT, p2i(get_c2i_unverified_inline_entry()));
3964 }
3965 if (get_c2i_no_clinit_check_entry() != nullptr) {
3966 st->print(" c2iNCI: " INTPTR_FORMAT, p2i(get_c2i_no_clinit_check_entry()));
3967 }
3968 st->cr();
3969 }
3970
3971 #ifndef PRODUCT
3972
3973 void AdapterHandlerLibrary::print_statistics() {
3974 print_table_statistics();
3975 }
3976
3977 #endif /* PRODUCT */
3978
3979 bool AdapterHandlerLibrary::is_abstract_method_adapter(AdapterHandlerEntry* entry) {
3980 if (entry == _abstract_method_handler) {
3981 return true;
3982 }
3983 return false;
3984 }
3985
3986 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* current))
3987 assert(current == JavaThread::current(), "pre-condition");
3988 StackOverflow* overflow_state = current->stack_overflow_state();
3989 overflow_state->enable_stack_reserved_zone(/*check_if_disabled*/true);
3990 overflow_state->set_reserved_stack_activation(current->stack_base());
3991 JRT_END
3992
3993 frame SharedRuntime::look_for_reserved_stack_annotated_method(JavaThread* current, frame fr) {
3994 ResourceMark rm(current);
3995 frame activation;
3996 nmethod* nm = nullptr;
3997 int count = 1;
3998
3999 assert(fr.is_java_frame(), "Must start on Java frame");
4000
4001 RegisterMap map(JavaThread::current(),
4002 RegisterMap::UpdateMap::skip,
4003 RegisterMap::ProcessFrames::skip,
4004 RegisterMap::WalkContinuation::skip); // don't walk continuations
4005 for (; !fr.is_first_frame(); fr = fr.sender(&map)) {
4006 if (!fr.is_java_frame()) {
4007 continue;
4008 }
4009
4010 Method* method = nullptr;
4011 bool found = false;
4012 if (fr.is_interpreted_frame()) {
4013 method = fr.interpreter_frame_method();
4014 if (method != nullptr && method->has_reserved_stack_access()) {
4015 found = true;
4016 }
4017 } else {
4018 CodeBlob* cb = fr.cb();
4019 if (cb != nullptr && cb->is_nmethod()) {
4020 nm = cb->as_nmethod();
4021 method = nm->method();
4022 // scope_desc_near() must be used, instead of scope_desc_at() because on
4023 // SPARC, the pcDesc can be on the delay slot after the call instruction.
4024 for (ScopeDesc *sd = nm->scope_desc_near(fr.pc()); sd != nullptr; sd = sd->sender()) {
4025 method = sd->method();
4026 if (method != nullptr && method->has_reserved_stack_access()) {
4027 found = true;
4028 }
4029 }
4030 }
4031 }
4032 if (found) {
4033 activation = fr;
4034 warning("Potentially dangerous stack overflow in "
4035 "ReservedStackAccess annotated method %s [%d]",
4036 method->name_and_sig_as_C_string(), count++);
4037 EventReservedStackActivation event;
4038 if (event.should_commit()) {
4039 event.set_method(method);
4040 event.commit();
4041 }
4042 }
4043 }
4044 return activation;
4045 }
4046
4047 void SharedRuntime::on_slowpath_allocation_exit(JavaThread* current) {
4048 // After any safepoint, just before going back to compiled code,
4049 // we inform the GC that we will be doing initializing writes to
4050 // this object in the future without emitting card-marks, so
4051 // GC may take any compensating steps.
4052
4053 oop new_obj = current->vm_result_oop();
4054 if (new_obj == nullptr) return;
4055
4056 BarrierSet *bs = BarrierSet::barrier_set();
4057 bs->on_slowpath_allocation_exit(current, new_obj);
4058 }
4059
4060 // We are at a compiled code to interpreter call. We need backing
4061 // buffers for all inline type arguments. Allocate an object array to
4062 // hold them (convenient because once we're done with it we don't have
4063 // to worry about freeing it).
4064 oop SharedRuntime::allocate_inline_types_impl(JavaThread* current, methodHandle callee, bool allocate_receiver, TRAPS) {
4065 assert(InlineTypePassFieldsAsArgs, "no reason to call this");
4066 ResourceMark rm;
4067
4068 int nb_slots = 0;
4069 InstanceKlass* holder = callee->method_holder();
4070 allocate_receiver &= !callee->is_static() && holder->is_inline_klass() && callee->is_scalarized_arg(0);
4071 if (allocate_receiver) {
4072 nb_slots++;
4073 }
4074 int arg_num = callee->is_static() ? 0 : 1;
4075 for (SignatureStream ss(callee->signature()); !ss.at_return_type(); ss.next()) {
4076 BasicType bt = ss.type();
4077 if (bt == T_OBJECT && callee->is_scalarized_arg(arg_num)) {
4078 nb_slots++;
4079 }
4080 if (bt != T_VOID) {
4081 arg_num++;
4082 }
4083 }
4084 objArrayOop array_oop = oopFactory::new_objectArray(nb_slots, CHECK_NULL);
4085 objArrayHandle array(THREAD, array_oop);
4086 arg_num = callee->is_static() ? 0 : 1;
4087 int i = 0;
4088 if (allocate_receiver) {
4089 InlineKlass* vk = InlineKlass::cast(holder);
4090 oop res = vk->allocate_instance(CHECK_NULL);
4091 array->obj_at_put(i++, res);
4092 }
4093 for (SignatureStream ss(callee->signature()); !ss.at_return_type(); ss.next()) {
4094 BasicType bt = ss.type();
4095 if (bt == T_OBJECT && callee->is_scalarized_arg(arg_num)) {
4096 InlineKlass* vk = ss.as_inline_klass(holder);
4097 assert(vk != nullptr, "Unexpected klass");
4098 oop res = vk->allocate_instance(CHECK_NULL);
4099 array->obj_at_put(i++, res);
4100 }
4101 if (bt != T_VOID) {
4102 arg_num++;
4103 }
4104 }
4105 return array();
4106 }
4107
4108 JRT_ENTRY(void, SharedRuntime::allocate_inline_types(JavaThread* current, Method* callee_method, bool allocate_receiver))
4109 methodHandle callee(current, callee_method);
4110 oop array = SharedRuntime::allocate_inline_types_impl(current, callee, allocate_receiver, CHECK);
4111 current->set_vm_result_oop(array);
4112 current->set_vm_result_metadata(callee()); // TODO: required to keep callee live?
4113 JRT_END
4114
4115 // We're returning from an interpreted method: load each field into a
4116 // register following the calling convention
4117 JRT_LEAF(void, SharedRuntime::load_inline_type_fields_in_regs(JavaThread* current, oopDesc* res))
4118 {
4119 assert(res->klass()->is_inline_klass(), "only inline types here");
4120 ResourceMark rm;
4121 RegisterMap reg_map(current,
4122 RegisterMap::UpdateMap::include,
4123 RegisterMap::ProcessFrames::include,
4124 RegisterMap::WalkContinuation::skip);
4125 frame stubFrame = current->last_frame();
4126 frame callerFrame = stubFrame.sender(®_map);
4127 assert(callerFrame.is_interpreted_frame(), "should be coming from interpreter");
4128
4129 InlineKlass* vk = InlineKlass::cast(res->klass());
4130
4131 const Array<SigEntry>* sig_vk = vk->extended_sig();
4132 const Array<VMRegPair>* regs = vk->return_regs();
4133
4134 if (regs == nullptr) {
4135 // The fields of the inline klass don't fit in registers, bail out
4136 return;
4137 }
4138
4139 int j = 1;
4140 for (int i = 0; i < sig_vk->length(); i++) {
4141 BasicType bt = sig_vk->at(i)._bt;
4142 if (bt == T_METADATA) {
4143 continue;
4144 }
4145 if (bt == T_VOID) {
4146 if (sig_vk->at(i-1)._bt == T_LONG ||
4147 sig_vk->at(i-1)._bt == T_DOUBLE) {
4148 j++;
4149 }
4150 continue;
4151 }
4152 int off = sig_vk->at(i)._offset;
4153 assert(off > 0, "offset in object should be positive");
4154 VMRegPair pair = regs->at(j);
4155 address loc = reg_map.location(pair.first(), nullptr);
4156 switch(bt) {
4157 case T_BOOLEAN:
4158 *(jboolean*)loc = res->bool_field(off);
4159 break;
4160 case T_CHAR:
4161 *(jchar*)loc = res->char_field(off);
4162 break;
4163 case T_BYTE:
4164 *(jbyte*)loc = res->byte_field(off);
4165 break;
4166 case T_SHORT:
4167 *(jshort*)loc = res->short_field(off);
4168 break;
4169 case T_INT: {
4170 *(jint*)loc = res->int_field(off);
4171 break;
4172 }
4173 case T_LONG:
4174 #ifdef _LP64
4175 *(intptr_t*)loc = res->long_field(off);
4176 #else
4177 Unimplemented();
4178 #endif
4179 break;
4180 case T_OBJECT:
4181 case T_ARRAY: {
4182 *(oop*)loc = res->obj_field(off);
4183 break;
4184 }
4185 case T_FLOAT:
4186 *(jfloat*)loc = res->float_field(off);
4187 break;
4188 case T_DOUBLE:
4189 *(jdouble*)loc = res->double_field(off);
4190 break;
4191 default:
4192 ShouldNotReachHere();
4193 }
4194 j++;
4195 }
4196 assert(j == regs->length(), "missed a field?");
4197
4198 #ifdef ASSERT
4199 VMRegPair pair = regs->at(0);
4200 address loc = reg_map.location(pair.first(), nullptr);
4201 assert(*(oopDesc**)loc == res, "overwritten object");
4202 #endif
4203
4204 current->set_vm_result_oop(res);
4205 }
4206 JRT_END
4207
4208 // We've returned to an interpreted method, the interpreter needs a
4209 // reference to an inline type instance. Allocate it and initialize it
4210 // from field's values in registers.
4211 JRT_BLOCK_ENTRY(void, SharedRuntime::store_inline_type_fields_to_buf(JavaThread* current, intptr_t res))
4212 {
4213 ResourceMark rm;
4214 RegisterMap reg_map(current,
4215 RegisterMap::UpdateMap::include,
4216 RegisterMap::ProcessFrames::include,
4217 RegisterMap::WalkContinuation::skip);
4218 frame stubFrame = current->last_frame();
4219 frame callerFrame = stubFrame.sender(®_map);
4220
4221 #ifdef ASSERT
4222 InlineKlass* verif_vk = InlineKlass::returned_inline_klass(reg_map);
4223 #endif
4224
4225 if (!is_set_nth_bit(res, 0)) {
4226 // We're not returning with inline type fields in registers (the
4227 // calling convention didn't allow it for this inline klass)
4228 assert(!Metaspace::contains((void*)res), "should be oop or pointer in buffer area");
4229 current->set_vm_result_oop((oopDesc*)res);
4230 assert(verif_vk == nullptr, "broken calling convention");
4231 return;
4232 }
4233
4234 clear_nth_bit(res, 0);
4235 InlineKlass* vk = (InlineKlass*)res;
4236 assert(verif_vk == vk, "broken calling convention");
4237 assert(Metaspace::contains((void*)res), "should be klass");
4238
4239 // Allocate handles for every oop field so they are safe in case of
4240 // a safepoint when allocating
4241 GrowableArray<Handle> handles;
4242 vk->save_oop_fields(reg_map, handles);
4243
4244 // It's unsafe to safepoint until we are here
4245 JRT_BLOCK;
4246 {
4247 JavaThread* THREAD = current;
4248 oop vt = vk->realloc_result(reg_map, handles, CHECK);
4249 current->set_vm_result_oop(vt);
4250 }
4251 JRT_BLOCK_END;
4252 }
4253 JRT_END