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/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "metaprogramming/primitiveConversions.hpp"
51 #include "oops/klass.hpp"
52 #include "oops/method.inline.hpp"
53 #include "oops/objArrayKlass.hpp"
54 #include "oops/oop.inline.hpp"
55 #include "prims/forte.hpp"
56 #include "prims/jvmtiExport.hpp"
57 #include "prims/jvmtiThreadState.hpp"
58 #include "prims/methodHandles.hpp"
59 #include "prims/nativeLookup.hpp"
60 #include "runtime/arguments.hpp"
61 #include "runtime/atomic.hpp"
62 #include "runtime/basicLock.inline.hpp"
63 #include "runtime/frame.inline.hpp"
64 #include "runtime/handles.inline.hpp"
65 #include "runtime/init.hpp"
66 #include "runtime/interfaceSupport.inline.hpp"
67 #include "runtime/java.hpp"
68 #include "runtime/javaCalls.hpp"
69 #include "runtime/jniHandles.inline.hpp"
70 #include "runtime/perfData.hpp"
71 #include "runtime/sharedRuntime.hpp"
72 #include "runtime/stackWatermarkSet.hpp"
73 #include "runtime/stubRoutines.hpp"
74 #include "runtime/synchronizer.inline.hpp"
75 #include "runtime/timerTrace.hpp"
76 #include "runtime/vframe.inline.hpp"
77 #include "runtime/vframeArray.hpp"
78 #include "runtime/vm_version.hpp"
79 #include "utilities/copy.hpp"
80 #include "utilities/dtrace.hpp"
81 #include "utilities/events.hpp"
82 #include "utilities/globalDefinitions.hpp"
83 #include "utilities/resourceHash.hpp"
84 #include "utilities/macros.hpp"
85 #include "utilities/xmlstream.hpp"
86 #ifdef COMPILER1
87 #include "c1/c1_Runtime1.hpp"
88 #endif
89 #if INCLUDE_JFR
90 #include "jfr/jfr.inline.hpp"
91 #endif
92
93 // Shared runtime stub routines reside in their own unique blob with a
94 // single entry point
95
96
97 #define SHARED_STUB_FIELD_DEFINE(name, type) \
98 type* SharedRuntime::BLOB_FIELD_NAME(name);
99 SHARED_STUBS_DO(SHARED_STUB_FIELD_DEFINE)
100 #undef SHARED_STUB_FIELD_DEFINE
101
102 nmethod* SharedRuntime::_cont_doYield_stub;
103
104 #if 0
105 // TODO tweak global stub name generation to match this
106 #define SHARED_STUB_NAME_DECLARE(name, type) "Shared Runtime " # name "_blob",
107 const char *SharedRuntime::_stub_names[] = {
108 SHARED_STUBS_DO(SHARED_STUB_NAME_DECLARE)
109 };
110 #endif
111
112 //----------------------------generate_stubs-----------------------------------
113 void SharedRuntime::generate_initial_stubs() {
114 // Build this early so it's available for the interpreter.
115 _throw_StackOverflowError_blob =
116 generate_throw_exception(StubId::shared_throw_StackOverflowError_id,
117 CAST_FROM_FN_PTR(address, SharedRuntime::throw_StackOverflowError));
118 }
119
120 void SharedRuntime::generate_stubs() {
121 _wrong_method_blob =
122 generate_resolve_blob(StubId::shared_wrong_method_id,
123 CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method));
124 _wrong_method_abstract_blob =
125 generate_resolve_blob(StubId::shared_wrong_method_abstract_id,
126 CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract));
127 _ic_miss_blob =
128 generate_resolve_blob(StubId::shared_ic_miss_id,
129 CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss));
130 _resolve_opt_virtual_call_blob =
131 generate_resolve_blob(StubId::shared_resolve_opt_virtual_call_id,
132 CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C));
133 _resolve_virtual_call_blob =
134 generate_resolve_blob(StubId::shared_resolve_virtual_call_id,
135 CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C));
136 _resolve_static_call_blob =
137 generate_resolve_blob(StubId::shared_resolve_static_call_id,
138 CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C));
139
140 _throw_delayed_StackOverflowError_blob =
141 generate_throw_exception(StubId::shared_throw_delayed_StackOverflowError_id,
142 CAST_FROM_FN_PTR(address, SharedRuntime::throw_delayed_StackOverflowError));
143
144 _throw_AbstractMethodError_blob =
145 generate_throw_exception(StubId::shared_throw_AbstractMethodError_id,
146 CAST_FROM_FN_PTR(address, SharedRuntime::throw_AbstractMethodError));
147
148 _throw_IncompatibleClassChangeError_blob =
149 generate_throw_exception(StubId::shared_throw_IncompatibleClassChangeError_id,
150 CAST_FROM_FN_PTR(address, SharedRuntime::throw_IncompatibleClassChangeError));
151
152 _throw_NullPointerException_at_call_blob =
153 generate_throw_exception(StubId::shared_throw_NullPointerException_at_call_id,
154 CAST_FROM_FN_PTR(address, SharedRuntime::throw_NullPointerException_at_call));
155
156 #if COMPILER2_OR_JVMCI
157 // Vectors are generated only by C2 and JVMCI.
158 bool support_wide = is_wide_vector(MaxVectorSize);
159 if (support_wide) {
160 _polling_page_vectors_safepoint_handler_blob =
161 generate_handler_blob(StubId::shared_polling_page_vectors_safepoint_handler_id,
162 CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception));
163 }
164 #endif // COMPILER2_OR_JVMCI
165 _polling_page_safepoint_handler_blob =
166 generate_handler_blob(StubId::shared_polling_page_safepoint_handler_id,
167 CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception));
168 _polling_page_return_handler_blob =
169 generate_handler_blob(StubId::shared_polling_page_return_handler_id,
170 CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception));
171
172 generate_deopt_blob();
173 }
174
175 void SharedRuntime::init_adapter_library() {
176 AdapterHandlerLibrary::initialize();
177 }
178
179 #if INCLUDE_JFR
180 //------------------------------generate jfr runtime stubs ------
181 void SharedRuntime::generate_jfr_stubs() {
182 ResourceMark rm;
183 const char* timer_msg = "SharedRuntime generate_jfr_stubs";
184 TraceTime timer(timer_msg, TRACETIME_LOG(Info, startuptime));
185
186 _jfr_write_checkpoint_blob = generate_jfr_write_checkpoint();
187 _jfr_return_lease_blob = generate_jfr_return_lease();
188 }
189
190 #endif // INCLUDE_JFR
191
192 #include <math.h>
193
194 // Implementation of SharedRuntime
195
196 #ifndef PRODUCT
197 // For statistics
198 uint SharedRuntime::_ic_miss_ctr = 0;
199 uint SharedRuntime::_wrong_method_ctr = 0;
200 uint SharedRuntime::_resolve_static_ctr = 0;
201 uint SharedRuntime::_resolve_virtual_ctr = 0;
202 uint SharedRuntime::_resolve_opt_virtual_ctr = 0;
203 uint SharedRuntime::_implicit_null_throws = 0;
204 uint SharedRuntime::_implicit_div0_throws = 0;
205
206 int64_t SharedRuntime::_nof_normal_calls = 0;
207 int64_t SharedRuntime::_nof_inlined_calls = 0;
208 int64_t SharedRuntime::_nof_megamorphic_calls = 0;
209 int64_t SharedRuntime::_nof_static_calls = 0;
210 int64_t SharedRuntime::_nof_inlined_static_calls = 0;
211 int64_t SharedRuntime::_nof_interface_calls = 0;
212 int64_t SharedRuntime::_nof_inlined_interface_calls = 0;
213
214 uint SharedRuntime::_new_instance_ctr=0;
215 uint SharedRuntime::_new_array_ctr=0;
216 uint SharedRuntime::_multi2_ctr=0;
217 uint SharedRuntime::_multi3_ctr=0;
218 uint SharedRuntime::_multi4_ctr=0;
219 uint SharedRuntime::_multi5_ctr=0;
220 uint SharedRuntime::_mon_enter_stub_ctr=0;
221 uint SharedRuntime::_mon_exit_stub_ctr=0;
222 uint SharedRuntime::_mon_enter_ctr=0;
223 uint SharedRuntime::_mon_exit_ctr=0;
224 uint SharedRuntime::_partial_subtype_ctr=0;
225 uint SharedRuntime::_jbyte_array_copy_ctr=0;
226 uint SharedRuntime::_jshort_array_copy_ctr=0;
227 uint SharedRuntime::_jint_array_copy_ctr=0;
228 uint SharedRuntime::_jlong_array_copy_ctr=0;
229 uint SharedRuntime::_oop_array_copy_ctr=0;
230 uint SharedRuntime::_checkcast_array_copy_ctr=0;
231 uint SharedRuntime::_unsafe_array_copy_ctr=0;
232 uint SharedRuntime::_generic_array_copy_ctr=0;
233 uint SharedRuntime::_slow_array_copy_ctr=0;
234 uint SharedRuntime::_find_handler_ctr=0;
235 uint SharedRuntime::_rethrow_ctr=0;
236 uint SharedRuntime::_unsafe_set_memory_ctr=0;
237
238 int SharedRuntime::_ICmiss_index = 0;
239 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count];
240 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count];
241
242
243 void SharedRuntime::trace_ic_miss(address at) {
244 for (int i = 0; i < _ICmiss_index; i++) {
245 if (_ICmiss_at[i] == at) {
246 _ICmiss_count[i]++;
247 return;
248 }
249 }
250 int index = _ICmiss_index++;
251 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1;
252 _ICmiss_at[index] = at;
253 _ICmiss_count[index] = 1;
254 }
255
256 void SharedRuntime::print_ic_miss_histogram() {
257 if (ICMissHistogram) {
258 tty->print_cr("IC Miss Histogram:");
259 int tot_misses = 0;
260 for (int i = 0; i < _ICmiss_index; i++) {
261 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", p2i(_ICmiss_at[i]), _ICmiss_count[i]);
262 tot_misses += _ICmiss_count[i];
263 }
264 tty->print_cr("Total IC misses: %7d", tot_misses);
265 }
266 }
267 #endif // PRODUCT
268
269
270 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x))
271 return x * y;
272 JRT_END
273
274
275 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x))
276 if (x == min_jlong && y == CONST64(-1)) {
277 return x;
278 } else {
279 return x / y;
280 }
281 JRT_END
282
283
284 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x))
285 if (x == min_jlong && y == CONST64(-1)) {
286 return 0;
287 } else {
288 return x % y;
289 }
290 JRT_END
291
292
293 #ifdef _WIN64
294 const juint float_sign_mask = 0x7FFFFFFF;
295 const juint float_infinity = 0x7F800000;
296 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF);
297 const julong double_infinity = CONST64(0x7FF0000000000000);
298 #endif
299
300 #if !defined(X86)
301 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y))
302 #ifdef _WIN64
303 // 64-bit Windows on amd64 returns the wrong values for
304 // infinity operands.
305 juint xbits = PrimitiveConversions::cast<juint>(x);
306 juint ybits = PrimitiveConversions::cast<juint>(y);
307 // x Mod Infinity == x unless x is infinity
308 if (((xbits & float_sign_mask) != float_infinity) &&
309 ((ybits & float_sign_mask) == float_infinity) ) {
310 return x;
311 }
312 return ((jfloat)fmod_winx64((double)x, (double)y));
313 #else
314 return ((jfloat)fmod((double)x,(double)y));
315 #endif
316 JRT_END
317
318 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y))
319 #ifdef _WIN64
320 julong xbits = PrimitiveConversions::cast<julong>(x);
321 julong ybits = PrimitiveConversions::cast<julong>(y);
322 // x Mod Infinity == x unless x is infinity
323 if (((xbits & double_sign_mask) != double_infinity) &&
324 ((ybits & double_sign_mask) == double_infinity) ) {
325 return x;
326 }
327 return ((jdouble)fmod_winx64((double)x, (double)y));
328 #else
329 return ((jdouble)fmod((double)x,(double)y));
330 #endif
331 JRT_END
332 #endif // !X86
333
334 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x))
335 return (jfloat)x;
336 JRT_END
337
338 #ifdef __SOFTFP__
339 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y))
340 return x + y;
341 JRT_END
342
343 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y))
344 return x - y;
345 JRT_END
346
347 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y))
348 return x * y;
349 JRT_END
350
351 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y))
352 return x / y;
353 JRT_END
354
355 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y))
356 return x + y;
357 JRT_END
358
359 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y))
360 return x - y;
361 JRT_END
362
363 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y))
364 return x * y;
365 JRT_END
366
367 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y))
368 return x / y;
369 JRT_END
370
371 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x))
372 return (jdouble)x;
373 JRT_END
374
375 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x))
376 return (jdouble)x;
377 JRT_END
378
379 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y))
380 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/
381 JRT_END
382
383 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y))
384 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
385 JRT_END
386
387 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y))
388 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */
389 JRT_END
390
391 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y))
392 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
393 JRT_END
394
395 // Functions to return the opposite of the aeabi functions for nan.
396 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(float x, float y))
397 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
398 JRT_END
399
400 JRT_LEAF(int, SharedRuntime::unordered_dcmplt(double x, double y))
401 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
402 JRT_END
403
404 JRT_LEAF(int, SharedRuntime::unordered_fcmple(float x, float y))
405 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
406 JRT_END
407
408 JRT_LEAF(int, SharedRuntime::unordered_dcmple(double x, double y))
409 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
410 JRT_END
411
412 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y))
413 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
414 JRT_END
415
416 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y))
417 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
418 JRT_END
419
420 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y))
421 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
422 JRT_END
423
424 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y))
425 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
426 JRT_END
427
428 // Intrinsics make gcc generate code for these.
429 float SharedRuntime::fneg(float f) {
430 return -f;
431 }
432
433 double SharedRuntime::dneg(double f) {
434 return -f;
435 }
436
437 #endif // __SOFTFP__
438
439 #if defined(__SOFTFP__) || defined(E500V2)
440 // Intrinsics make gcc generate code for these.
441 double SharedRuntime::dabs(double f) {
442 return (f <= (double)0.0) ? (double)0.0 - f : f;
443 }
444
445 #endif
446
447 #if defined(__SOFTFP__)
448 double SharedRuntime::dsqrt(double f) {
449 return sqrt(f);
450 }
451 #endif
452
453 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x))
454 if (g_isnan(x))
455 return 0;
456 if (x >= (jfloat) max_jint)
457 return max_jint;
458 if (x <= (jfloat) min_jint)
459 return min_jint;
460 return (jint) x;
461 JRT_END
462
463
464 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x))
465 if (g_isnan(x))
466 return 0;
467 if (x >= (jfloat) max_jlong)
468 return max_jlong;
469 if (x <= (jfloat) min_jlong)
470 return min_jlong;
471 return (jlong) x;
472 JRT_END
473
474
475 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x))
476 if (g_isnan(x))
477 return 0;
478 if (x >= (jdouble) max_jint)
479 return max_jint;
480 if (x <= (jdouble) min_jint)
481 return min_jint;
482 return (jint) x;
483 JRT_END
484
485
486 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x))
487 if (g_isnan(x))
488 return 0;
489 if (x >= (jdouble) max_jlong)
490 return max_jlong;
491 if (x <= (jdouble) min_jlong)
492 return min_jlong;
493 return (jlong) x;
494 JRT_END
495
496
497 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x))
498 return (jfloat)x;
499 JRT_END
500
501
502 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x))
503 return (jfloat)x;
504 JRT_END
505
506
507 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x))
508 return (jdouble)x;
509 JRT_END
510
511
512 // Exception handling across interpreter/compiler boundaries
513 //
514 // exception_handler_for_return_address(...) returns the continuation address.
515 // The continuation address is the entry point of the exception handler of the
516 // previous frame depending on the return address.
517
518 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* current, address return_address) {
519 // Note: This is called when we have unwound the frame of the callee that did
520 // throw an exception. So far, no check has been performed by the StackWatermarkSet.
521 // Notably, the stack is not walkable at this point, and hence the check must
522 // be deferred until later. Specifically, any of the handlers returned here in
523 // this function, will get dispatched to, and call deferred checks to
524 // StackWatermarkSet::after_unwind at a point where the stack is walkable.
525 assert(frame::verify_return_pc(return_address), "must be a return address: " INTPTR_FORMAT, p2i(return_address));
526 assert(current->frames_to_pop_failed_realloc() == 0 || Interpreter::contains(return_address), "missed frames to pop?");
527
528 // Reset method handle flag.
529 current->set_is_method_handle_return(false);
530
531 #if INCLUDE_JVMCI
532 // JVMCI's ExceptionHandlerStub expects the thread local exception PC to be clear
533 // and other exception handler continuations do not read it
534 current->set_exception_pc(nullptr);
535 #endif // INCLUDE_JVMCI
536
537 if (Continuation::is_return_barrier_entry(return_address)) {
538 return StubRoutines::cont_returnBarrierExc();
539 }
540
541 // The fastest case first
542 CodeBlob* blob = CodeCache::find_blob(return_address);
543 nmethod* nm = (blob != nullptr) ? blob->as_nmethod_or_null() : nullptr;
544 if (nm != nullptr) {
545 // Set flag if return address is a method handle call site.
546 current->set_is_method_handle_return(nm->is_method_handle_return(return_address));
547 // native nmethods don't have exception handlers
548 assert(!nm->is_native_method() || nm->method()->is_continuation_enter_intrinsic(), "no exception handler");
549 assert(nm->header_begin() != nm->exception_begin(), "no exception handler");
550 if (nm->is_deopt_pc(return_address)) {
551 // If we come here because of a stack overflow, the stack may be
552 // unguarded. Reguard the stack otherwise if we return to the
553 // deopt blob and the stack bang causes a stack overflow we
554 // crash.
555 StackOverflow* overflow_state = current->stack_overflow_state();
556 bool guard_pages_enabled = overflow_state->reguard_stack_if_needed();
557 if (overflow_state->reserved_stack_activation() != current->stack_base()) {
558 overflow_state->set_reserved_stack_activation(current->stack_base());
559 }
560 assert(guard_pages_enabled, "stack banging in deopt blob may cause crash");
561 // The deferred StackWatermarkSet::after_unwind check will be performed in
562 // Deoptimization::fetch_unroll_info (with exec_mode == Unpack_exception)
563 return SharedRuntime::deopt_blob()->unpack_with_exception();
564 } else {
565 // The deferred StackWatermarkSet::after_unwind check will be performed in
566 // * OptoRuntime::handle_exception_C_helper for C2 code
567 // * exception_handler_for_pc_helper via Runtime1::handle_exception_from_callee_id for C1 code
568 return nm->exception_begin();
569 }
570 }
571
572 // Entry code
573 if (StubRoutines::returns_to_call_stub(return_address)) {
574 // The deferred StackWatermarkSet::after_unwind check will be performed in
575 // JavaCallWrapper::~JavaCallWrapper
576 assert (StubRoutines::catch_exception_entry() != nullptr, "must be generated before");
577 return StubRoutines::catch_exception_entry();
578 }
579 if (blob != nullptr && blob->is_upcall_stub()) {
580 return StubRoutines::upcall_stub_exception_handler();
581 }
582 // Interpreted code
583 if (Interpreter::contains(return_address)) {
584 // The deferred StackWatermarkSet::after_unwind check will be performed in
585 // InterpreterRuntime::exception_handler_for_exception
586 return Interpreter::rethrow_exception_entry();
587 }
588
589 guarantee(blob == nullptr || !blob->is_runtime_stub(), "caller should have skipped stub");
590 guarantee(!VtableStubs::contains(return_address), "null exceptions in vtables should have been handled already!");
591
592 #ifndef PRODUCT
593 { ResourceMark rm;
594 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", p2i(return_address));
595 os::print_location(tty, (intptr_t)return_address);
596 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here");
597 tty->print_cr("b) other problem");
598 }
599 #endif // PRODUCT
600 ShouldNotReachHere();
601 return nullptr;
602 }
603
604
605 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* current, address return_address))
606 return raw_exception_handler_for_return_address(current, return_address);
607 JRT_END
608
609
610 address SharedRuntime::get_poll_stub(address pc) {
611 address stub;
612 // Look up the code blob
613 CodeBlob *cb = CodeCache::find_blob(pc);
614
615 // Should be an nmethod
616 guarantee(cb != nullptr && cb->is_nmethod(), "safepoint polling: pc must refer to an nmethod");
617
618 // Look up the relocation information
619 assert(cb->as_nmethod()->is_at_poll_or_poll_return(pc),
620 "safepoint polling: type must be poll at pc " INTPTR_FORMAT, p2i(pc));
621
622 #ifdef ASSERT
623 if (!((NativeInstruction*)pc)->is_safepoint_poll()) {
624 tty->print_cr("bad pc: " PTR_FORMAT, p2i(pc));
625 Disassembler::decode(cb);
626 fatal("Only polling locations are used for safepoint");
627 }
628 #endif
629
630 bool at_poll_return = cb->as_nmethod()->is_at_poll_return(pc);
631 bool has_wide_vectors = cb->as_nmethod()->has_wide_vectors();
632 if (at_poll_return) {
633 assert(SharedRuntime::polling_page_return_handler_blob() != nullptr,
634 "polling page return stub not created yet");
635 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();
636 } else if (has_wide_vectors) {
637 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != nullptr,
638 "polling page vectors safepoint stub not created yet");
639 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point();
640 } else {
641 assert(SharedRuntime::polling_page_safepoint_handler_blob() != nullptr,
642 "polling page safepoint stub not created yet");
643 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point();
644 }
645 log_debug(safepoint)("... found polling page %s exception at pc = "
646 INTPTR_FORMAT ", stub =" INTPTR_FORMAT,
647 at_poll_return ? "return" : "loop",
648 (intptr_t)pc, (intptr_t)stub);
649 return stub;
650 }
651
652 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread* current, Handle h_exception) {
653 if (JvmtiExport::can_post_on_exceptions()) {
654 vframeStream vfst(current, true);
655 methodHandle method = methodHandle(current, vfst.method());
656 address bcp = method()->bcp_from(vfst.bci());
657 JvmtiExport::post_exception_throw(current, method(), bcp, h_exception());
658 }
659
660 #if INCLUDE_JVMCI
661 if (EnableJVMCI) {
662 vframeStream vfst(current, true);
663 methodHandle method = methodHandle(current, vfst.method());
664 int bci = vfst.bci();
665 MethodData* trap_mdo = method->method_data();
666 if (trap_mdo != nullptr) {
667 // Set exception_seen if the exceptional bytecode is an invoke
668 Bytecode_invoke call = Bytecode_invoke_check(method, bci);
669 if (call.is_valid()) {
670 ResourceMark rm(current);
671
672 // Lock to read ProfileData, and ensure lock is not broken by a safepoint
673 MutexLocker ml(trap_mdo->extra_data_lock(), Mutex::_no_safepoint_check_flag);
674
675 ProfileData* pdata = trap_mdo->allocate_bci_to_data(bci, nullptr);
676 if (pdata != nullptr && pdata->is_BitData()) {
677 BitData* bit_data = (BitData*) pdata;
678 bit_data->set_exception_seen();
679 }
680 }
681 }
682 }
683 #endif
684
685 Exceptions::_throw(current, __FILE__, __LINE__, h_exception);
686 }
687
688 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread* current, Symbol* name, const char *message) {
689 Handle h_exception = Exceptions::new_exception(current, name, message);
690 throw_and_post_jvmti_exception(current, h_exception);
691 }
692
693 #if INCLUDE_JVMTI
694 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_start(oopDesc* vt, jboolean hide, JavaThread* current))
695 assert(hide == JNI_FALSE, "must be VTMS transition finish");
696 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
697 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
698 JNIHandles::destroy_local(vthread);
699 JRT_END
700
701 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_end(oopDesc* vt, jboolean hide, JavaThread* current))
702 assert(hide == JNI_TRUE, "must be VTMS transition start");
703 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
704 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
705 JNIHandles::destroy_local(vthread);
706 JRT_END
707
708 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_mount(oopDesc* vt, jboolean hide, JavaThread* current))
709 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
710 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
711 JNIHandles::destroy_local(vthread);
712 JRT_END
713
714 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_unmount(oopDesc* vt, jboolean hide, JavaThread* current))
715 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
716 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
717 JNIHandles::destroy_local(vthread);
718 JRT_END
719 #endif // INCLUDE_JVMTI
720
721 // The interpreter code to call this tracing function is only
722 // called/generated when UL is on for redefine, class and has the right level
723 // and tags. Since obsolete methods are never compiled, we don't have
724 // to modify the compilers to generate calls to this function.
725 //
726 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry(
727 JavaThread* thread, Method* method))
728 if (method->is_obsolete()) {
729 // We are calling an obsolete method, but this is not necessarily
730 // an error. Our method could have been redefined just after we
731 // fetched the Method* from the constant pool.
732 ResourceMark rm;
733 log_trace(redefine, class, obsolete)("calling obsolete method '%s'", method->name_and_sig_as_C_string());
734 }
735 return 0;
736 JRT_END
737
738 // ret_pc points into caller; we are returning caller's exception handler
739 // for given exception
740 // Note that the implementation of this method assumes it's only called when an exception has actually occured
741 address SharedRuntime::compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
742 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred) {
743 assert(nm != nullptr, "must exist");
744 ResourceMark rm;
745
746 #if INCLUDE_JVMCI
747 if (nm->is_compiled_by_jvmci()) {
748 // lookup exception handler for this pc
749 int catch_pco = pointer_delta_as_int(ret_pc, nm->code_begin());
750 ExceptionHandlerTable table(nm);
751 HandlerTableEntry *t = table.entry_for(catch_pco, -1, 0);
752 if (t != nullptr) {
753 return nm->code_begin() + t->pco();
754 } else {
755 return Deoptimization::deoptimize_for_missing_exception_handler(nm);
756 }
757 }
758 #endif // INCLUDE_JVMCI
759
760 ScopeDesc* sd = nm->scope_desc_at(ret_pc);
761 // determine handler bci, if any
762 EXCEPTION_MARK;
763
764 int handler_bci = -1;
765 int scope_depth = 0;
766 if (!force_unwind) {
767 int bci = sd->bci();
768 bool recursive_exception = false;
769 do {
770 bool skip_scope_increment = false;
771 // exception handler lookup
772 Klass* ek = exception->klass();
773 methodHandle mh(THREAD, sd->method());
774 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD);
775 if (HAS_PENDING_EXCEPTION) {
776 recursive_exception = true;
777 // We threw an exception while trying to find the exception handler.
778 // Transfer the new exception to the exception handle which will
779 // be set into thread local storage, and do another lookup for an
780 // exception handler for this exception, this time starting at the
781 // BCI of the exception handler which caused the exception to be
782 // thrown (bugs 4307310 and 4546590). Set "exception" reference
783 // argument to ensure that the correct exception is thrown (4870175).
784 recursive_exception_occurred = true;
785 exception = Handle(THREAD, PENDING_EXCEPTION);
786 CLEAR_PENDING_EXCEPTION;
787 if (handler_bci >= 0) {
788 bci = handler_bci;
789 handler_bci = -1;
790 skip_scope_increment = true;
791 }
792 }
793 else {
794 recursive_exception = false;
795 }
796 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) {
797 sd = sd->sender();
798 if (sd != nullptr) {
799 bci = sd->bci();
800 }
801 ++scope_depth;
802 }
803 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != nullptr));
804 }
805
806 // found handling method => lookup exception handler
807 int catch_pco = pointer_delta_as_int(ret_pc, nm->code_begin());
808
809 ExceptionHandlerTable table(nm);
810 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth);
811 if (t == nullptr && (nm->is_compiled_by_c1() || handler_bci != -1)) {
812 // Allow abbreviated catch tables. The idea is to allow a method
813 // to materialize its exceptions without committing to the exact
814 // routing of exceptions. In particular this is needed for adding
815 // a synthetic handler to unlock monitors when inlining
816 // synchronized methods since the unlock path isn't represented in
817 // the bytecodes.
818 t = table.entry_for(catch_pco, -1, 0);
819 }
820
821 #ifdef COMPILER1
822 if (t == nullptr && nm->is_compiled_by_c1()) {
823 assert(nm->unwind_handler_begin() != nullptr, "");
824 return nm->unwind_handler_begin();
825 }
826 #endif
827
828 if (t == nullptr) {
829 ttyLocker ttyl;
830 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d, catch_pco: %d", p2i(ret_pc), handler_bci, catch_pco);
831 tty->print_cr(" Exception:");
832 exception->print();
833 tty->cr();
834 tty->print_cr(" Compiled exception table :");
835 table.print();
836 nm->print();
837 nm->print_code();
838 guarantee(false, "missing exception handler");
839 return nullptr;
840 }
841
842 if (handler_bci != -1) { // did we find a handler in this method?
843 sd->method()->set_exception_handler_entered(handler_bci); // profile
844 }
845 return nm->code_begin() + t->pco();
846 }
847
848 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* current))
849 // These errors occur only at call sites
850 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_AbstractMethodError());
851 JRT_END
852
853 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
854 // These errors occur only at call sites
855 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub");
856 JRT_END
857
858 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* current))
859 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
860 JRT_END
861
862 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* current))
863 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_NullPointerException(), nullptr);
864 JRT_END
865
866 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* current))
867 // This entry point is effectively only used for NullPointerExceptions which occur at inline
868 // cache sites (when the callee activation is not yet set up) so we are at a call site
869 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_NullPointerException(), nullptr);
870 JRT_END
871
872 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* current))
873 throw_StackOverflowError_common(current, false);
874 JRT_END
875
876 JRT_ENTRY(void, SharedRuntime::throw_delayed_StackOverflowError(JavaThread* current))
877 throw_StackOverflowError_common(current, true);
878 JRT_END
879
880 void SharedRuntime::throw_StackOverflowError_common(JavaThread* current, bool delayed) {
881 // We avoid using the normal exception construction in this case because
882 // it performs an upcall to Java, and we're already out of stack space.
883 JavaThread* THREAD = current; // For exception macros.
884 Klass* k = vmClasses::StackOverflowError_klass();
885 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK);
886 if (delayed) {
887 java_lang_Throwable::set_message(exception_oop,
888 Universe::delayed_stack_overflow_error_message());
889 }
890 Handle exception (current, exception_oop);
891 if (StackTraceInThrowable) {
892 java_lang_Throwable::fill_in_stack_trace(exception);
893 }
894 // Remove the ScopedValue bindings in case we got a
895 // StackOverflowError while we were trying to remove ScopedValue
896 // bindings.
897 current->clear_scopedValueBindings();
898 // Increment counter for hs_err file reporting
899 Atomic::inc(&Exceptions::_stack_overflow_errors);
900 throw_and_post_jvmti_exception(current, exception);
901 }
902
903 address SharedRuntime::continuation_for_implicit_exception(JavaThread* current,
904 address pc,
905 ImplicitExceptionKind exception_kind)
906 {
907 address target_pc = nullptr;
908
909 if (Interpreter::contains(pc)) {
910 switch (exception_kind) {
911 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry();
912 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry();
913 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry();
914 default: ShouldNotReachHere();
915 }
916 } else {
917 switch (exception_kind) {
918 case STACK_OVERFLOW: {
919 // Stack overflow only occurs upon frame setup; the callee is
920 // going to be unwound. Dispatch to a shared runtime stub
921 // which will cause the StackOverflowError to be fabricated
922 // and processed.
923 // Stack overflow should never occur during deoptimization:
924 // the compiled method bangs the stack by as much as the
925 // interpreter would need in case of a deoptimization. The
926 // deoptimization blob and uncommon trap blob bang the stack
927 // in a debug VM to verify the correctness of the compiled
928 // method stack banging.
929 assert(current->deopt_mark() == nullptr, "no stack overflow from deopt blob/uncommon trap");
930 Events::log_exception(current, "StackOverflowError at " INTPTR_FORMAT, p2i(pc));
931 return SharedRuntime::throw_StackOverflowError_entry();
932 }
933
934 case IMPLICIT_NULL: {
935 if (VtableStubs::contains(pc)) {
936 // We haven't yet entered the callee frame. Fabricate an
937 // exception and begin dispatching it in the caller. Since
938 // the caller was at a call site, it's safe to destroy all
939 // caller-saved registers, as these entry points do.
940 VtableStub* vt_stub = VtableStubs::stub_containing(pc);
941
942 // If vt_stub is null, then return null to signal handler to report the SEGV error.
943 if (vt_stub == nullptr) return nullptr;
944
945 if (vt_stub->is_abstract_method_error(pc)) {
946 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs");
947 Events::log_exception(current, "AbstractMethodError at " INTPTR_FORMAT, p2i(pc));
948 // Instead of throwing the abstract method error here directly, we re-resolve
949 // and will throw the AbstractMethodError during resolve. As a result, we'll
950 // get a more detailed error message.
951 return SharedRuntime::get_handle_wrong_method_stub();
952 } else {
953 Events::log_exception(current, "NullPointerException at vtable entry " INTPTR_FORMAT, p2i(pc));
954 // Assert that the signal comes from the expected location in stub code.
955 assert(vt_stub->is_null_pointer_exception(pc),
956 "obtained signal from unexpected location in stub code");
957 return SharedRuntime::throw_NullPointerException_at_call_entry();
958 }
959 } else {
960 CodeBlob* cb = CodeCache::find_blob(pc);
961
962 // If code blob is null, then return null to signal handler to report the SEGV error.
963 if (cb == nullptr) return nullptr;
964
965 // Exception happened in CodeCache. Must be either:
966 // 1. Inline-cache check in C2I handler blob,
967 // 2. Inline-cache check in nmethod, or
968 // 3. Implicit null exception in nmethod
969
970 if (!cb->is_nmethod()) {
971 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob();
972 if (!is_in_blob) {
973 // Allow normal crash reporting to handle this
974 return nullptr;
975 }
976 Events::log_exception(current, "NullPointerException in code blob at " INTPTR_FORMAT, p2i(pc));
977 // There is no handler here, so we will simply unwind.
978 return SharedRuntime::throw_NullPointerException_at_call_entry();
979 }
980
981 // Otherwise, it's a compiled method. Consult its exception handlers.
982 nmethod* nm = cb->as_nmethod();
983 if (nm->inlinecache_check_contains(pc)) {
984 // exception happened inside inline-cache check code
985 // => the nmethod is not yet active (i.e., the frame
986 // is not set up yet) => use return address pushed by
987 // caller => don't push another return address
988 Events::log_exception(current, "NullPointerException in IC check " INTPTR_FORMAT, p2i(pc));
989 return SharedRuntime::throw_NullPointerException_at_call_entry();
990 }
991
992 if (nm->method()->is_method_handle_intrinsic()) {
993 // exception happened inside MH dispatch code, similar to a vtable stub
994 Events::log_exception(current, "NullPointerException in MH adapter " INTPTR_FORMAT, p2i(pc));
995 return SharedRuntime::throw_NullPointerException_at_call_entry();
996 }
997
998 #ifndef PRODUCT
999 _implicit_null_throws++;
1000 #endif
1001 target_pc = nm->continuation_for_implicit_null_exception(pc);
1002 // If there's an unexpected fault, target_pc might be null,
1003 // in which case we want to fall through into the normal
1004 // error handling code.
1005 }
1006
1007 break; // fall through
1008 }
1009
1010
1011 case IMPLICIT_DIVIDE_BY_ZERO: {
1012 nmethod* nm = CodeCache::find_nmethod(pc);
1013 guarantee(nm != nullptr, "must have containing compiled method for implicit division-by-zero exceptions");
1014 #ifndef PRODUCT
1015 _implicit_div0_throws++;
1016 #endif
1017 target_pc = nm->continuation_for_implicit_div0_exception(pc);
1018 // If there's an unexpected fault, target_pc might be null,
1019 // in which case we want to fall through into the normal
1020 // error handling code.
1021 break; // fall through
1022 }
1023
1024 default: ShouldNotReachHere();
1025 }
1026
1027 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind");
1028
1029 if (exception_kind == IMPLICIT_NULL) {
1030 #ifndef PRODUCT
1031 // for AbortVMOnException flag
1032 Exceptions::debug_check_abort("java.lang.NullPointerException");
1033 #endif //PRODUCT
1034 Events::log_exception(current, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
1035 } else {
1036 #ifndef PRODUCT
1037 // for AbortVMOnException flag
1038 Exceptions::debug_check_abort("java.lang.ArithmeticException");
1039 #endif //PRODUCT
1040 Events::log_exception(current, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
1041 }
1042 return target_pc;
1043 }
1044
1045 ShouldNotReachHere();
1046 return nullptr;
1047 }
1048
1049
1050 /**
1051 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is
1052 * installed in the native function entry of all native Java methods before
1053 * they get linked to their actual native methods.
1054 *
1055 * \note
1056 * This method actually never gets called! The reason is because
1057 * the interpreter's native entries call NativeLookup::lookup() which
1058 * throws the exception when the lookup fails. The exception is then
1059 * caught and forwarded on the return from NativeLookup::lookup() call
1060 * before the call to the native function. This might change in the future.
1061 */
1062 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...))
1063 {
1064 // We return a bad value here to make sure that the exception is
1065 // forwarded before we look at the return value.
1066 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badAddress);
1067 }
1068 JNI_END
1069
1070 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
1071 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
1072 }
1073
1074 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
1075 #if INCLUDE_JVMCI
1076 if (!obj->klass()->has_finalizer()) {
1077 return;
1078 }
1079 #endif // INCLUDE_JVMCI
1080 assert(oopDesc::is_oop(obj), "must be a valid oop");
1081 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
1082 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
1083 JRT_END
1084
1085 jlong SharedRuntime::get_java_tid(JavaThread* thread) {
1086 assert(thread != nullptr, "No thread");
1087 if (thread == nullptr) {
1088 return 0;
1089 }
1090 guarantee(Thread::current() != thread || thread->is_oop_safe(),
1091 "current cannot touch oops after its GC barrier is detached.");
1092 oop obj = thread->threadObj();
1093 return (obj == nullptr) ? 0 : java_lang_Thread::thread_id(obj);
1094 }
1095
1096 /**
1097 * This function ought to be a void function, but cannot be because
1098 * it gets turned into a tail-call on sparc, which runs into dtrace bug
1099 * 6254741. Once that is fixed we can remove the dummy return value.
1100 */
1101 int SharedRuntime::dtrace_object_alloc(oopDesc* o) {
1102 return dtrace_object_alloc(JavaThread::current(), o, o->size());
1103 }
1104
1105 int SharedRuntime::dtrace_object_alloc(JavaThread* thread, oopDesc* o) {
1106 return dtrace_object_alloc(thread, o, o->size());
1107 }
1108
1109 int SharedRuntime::dtrace_object_alloc(JavaThread* thread, oopDesc* o, size_t size) {
1110 assert(DTraceAllocProbes, "wrong call");
1111 Klass* klass = o->klass();
1112 Symbol* name = klass->name();
1113 HOTSPOT_OBJECT_ALLOC(
1114 get_java_tid(thread),
1115 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize);
1116 return 0;
1117 }
1118
1119 JRT_LEAF(int, SharedRuntime::dtrace_method_entry(
1120 JavaThread* current, Method* method))
1121 assert(current == JavaThread::current(), "pre-condition");
1122
1123 assert(DTraceMethodProbes, "wrong call");
1124 Symbol* kname = method->klass_name();
1125 Symbol* name = method->name();
1126 Symbol* sig = method->signature();
1127 HOTSPOT_METHOD_ENTRY(
1128 get_java_tid(current),
1129 (char *) kname->bytes(), kname->utf8_length(),
1130 (char *) name->bytes(), name->utf8_length(),
1131 (char *) sig->bytes(), sig->utf8_length());
1132 return 0;
1133 JRT_END
1134
1135 JRT_LEAF(int, SharedRuntime::dtrace_method_exit(
1136 JavaThread* current, Method* method))
1137 assert(current == JavaThread::current(), "pre-condition");
1138 assert(DTraceMethodProbes, "wrong call");
1139 Symbol* kname = method->klass_name();
1140 Symbol* name = method->name();
1141 Symbol* sig = method->signature();
1142 HOTSPOT_METHOD_RETURN(
1143 get_java_tid(current),
1144 (char *) kname->bytes(), kname->utf8_length(),
1145 (char *) name->bytes(), name->utf8_length(),
1146 (char *) sig->bytes(), sig->utf8_length());
1147 return 0;
1148 JRT_END
1149
1150
1151 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode)
1152 // for a call current in progress, i.e., arguments has been pushed on stack
1153 // put callee has not been invoked yet. Used by: resolve virtual/static,
1154 // vtable updates, etc. Caller frame must be compiled.
1155 Handle SharedRuntime::find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) {
1156 JavaThread* current = THREAD;
1157 ResourceMark rm(current);
1158
1159 // last java frame on stack (which includes native call frames)
1160 vframeStream vfst(current, true); // Do not skip and javaCalls
1161
1162 return find_callee_info_helper(vfst, bc, callinfo, THREAD);
1163 }
1164
1165 Method* SharedRuntime::extract_attached_method(vframeStream& vfst) {
1166 nmethod* caller = vfst.nm();
1167
1168 address pc = vfst.frame_pc();
1169 { // Get call instruction under lock because another thread may be busy patching it.
1170 CompiledICLocker ic_locker(caller);
1171 return caller->attached_method_before_pc(pc);
1172 }
1173 return nullptr;
1174 }
1175
1176 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
1177 // for a call current in progress, i.e., arguments has been pushed on stack
1178 // but callee has not been invoked yet. Caller frame must be compiled.
1179 Handle SharedRuntime::find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc,
1180 CallInfo& callinfo, TRAPS) {
1181 Handle receiver;
1182 Handle nullHandle; // create a handy null handle for exception returns
1183 JavaThread* current = THREAD;
1184
1185 assert(!vfst.at_end(), "Java frame must exist");
1186
1187 // Find caller and bci from vframe
1188 methodHandle caller(current, vfst.method());
1189 int bci = vfst.bci();
1190
1191 if (caller->is_continuation_enter_intrinsic()) {
1192 bc = Bytecodes::_invokestatic;
1193 LinkResolver::resolve_continuation_enter(callinfo, CHECK_NH);
1194 return receiver;
1195 }
1196
1197 Bytecode_invoke bytecode(caller, bci);
1198 int bytecode_index = bytecode.index();
1199 bc = bytecode.invoke_code();
1200
1201 methodHandle attached_method(current, extract_attached_method(vfst));
1202 if (attached_method.not_null()) {
1203 Method* callee = bytecode.static_target(CHECK_NH);
1204 vmIntrinsics::ID id = callee->intrinsic_id();
1205 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call,
1206 // it attaches statically resolved method to the call site.
1207 if (MethodHandles::is_signature_polymorphic(id) &&
1208 MethodHandles::is_signature_polymorphic_intrinsic(id)) {
1209 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id);
1210
1211 // Adjust invocation mode according to the attached method.
1212 switch (bc) {
1213 case Bytecodes::_invokevirtual:
1214 if (attached_method->method_holder()->is_interface()) {
1215 bc = Bytecodes::_invokeinterface;
1216 }
1217 break;
1218 case Bytecodes::_invokeinterface:
1219 if (!attached_method->method_holder()->is_interface()) {
1220 bc = Bytecodes::_invokevirtual;
1221 }
1222 break;
1223 case Bytecodes::_invokehandle:
1224 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) {
1225 bc = attached_method->is_static() ? Bytecodes::_invokestatic
1226 : Bytecodes::_invokevirtual;
1227 }
1228 break;
1229 default:
1230 break;
1231 }
1232 }
1233 }
1234
1235 assert(bc != Bytecodes::_illegal, "not initialized");
1236
1237 bool has_receiver = bc != Bytecodes::_invokestatic &&
1238 bc != Bytecodes::_invokedynamic &&
1239 bc != Bytecodes::_invokehandle;
1240
1241 // Find receiver for non-static call
1242 if (has_receiver) {
1243 // This register map must be update since we need to find the receiver for
1244 // compiled frames. The receiver might be in a register.
1245 RegisterMap reg_map2(current,
1246 RegisterMap::UpdateMap::include,
1247 RegisterMap::ProcessFrames::include,
1248 RegisterMap::WalkContinuation::skip);
1249 frame stubFrame = current->last_frame();
1250 // Caller-frame is a compiled frame
1251 frame callerFrame = stubFrame.sender(®_map2);
1252
1253 if (attached_method.is_null()) {
1254 Method* callee = bytecode.static_target(CHECK_NH);
1255 if (callee == nullptr) {
1256 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1257 }
1258 }
1259
1260 // Retrieve from a compiled argument list
1261 receiver = Handle(current, callerFrame.retrieve_receiver(®_map2));
1262 assert(oopDesc::is_oop_or_null(receiver()), "");
1263
1264 if (receiver.is_null()) {
1265 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1266 }
1267 }
1268
1269 // Resolve method
1270 if (attached_method.not_null()) {
1271 // Parameterized by attached method.
1272 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, CHECK_NH);
1273 } else {
1274 // Parameterized by bytecode.
1275 constantPoolHandle constants(current, caller->constants());
1276 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH);
1277 }
1278
1279 #ifdef ASSERT
1280 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1281 if (has_receiver) {
1282 assert(receiver.not_null(), "should have thrown exception");
1283 Klass* receiver_klass = receiver->klass();
1284 Klass* rk = nullptr;
1285 if (attached_method.not_null()) {
1286 // In case there's resolved method attached, use its holder during the check.
1287 rk = attached_method->method_holder();
1288 } else {
1289 // Klass is already loaded.
1290 constantPoolHandle constants(current, caller->constants());
1291 rk = constants->klass_ref_at(bytecode_index, bc, CHECK_NH);
1292 }
1293 Klass* static_receiver_klass = rk;
1294 assert(receiver_klass->is_subtype_of(static_receiver_klass),
1295 "actual receiver must be subclass of static receiver klass");
1296 if (receiver_klass->is_instance_klass()) {
1297 if (InstanceKlass::cast(receiver_klass)->is_not_initialized()) {
1298 tty->print_cr("ERROR: Klass not yet initialized!!");
1299 receiver_klass->print();
1300 }
1301 assert(!InstanceKlass::cast(receiver_klass)->is_not_initialized(), "receiver_klass must be initialized");
1302 }
1303 }
1304 #endif
1305
1306 return receiver;
1307 }
1308
1309 methodHandle SharedRuntime::find_callee_method(TRAPS) {
1310 JavaThread* current = THREAD;
1311 ResourceMark rm(current);
1312 // We need first to check if any Java activations (compiled, interpreted)
1313 // exist on the stack since last JavaCall. If not, we need
1314 // to get the target method from the JavaCall wrapper.
1315 vframeStream vfst(current, true); // Do not skip any javaCalls
1316 methodHandle callee_method;
1317 if (vfst.at_end()) {
1318 // No Java frames were found on stack since we did the JavaCall.
1319 // Hence the stack can only contain an entry_frame. We need to
1320 // find the target method from the stub frame.
1321 RegisterMap reg_map(current,
1322 RegisterMap::UpdateMap::skip,
1323 RegisterMap::ProcessFrames::include,
1324 RegisterMap::WalkContinuation::skip);
1325 frame fr = current->last_frame();
1326 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1327 fr = fr.sender(®_map);
1328 assert(fr.is_entry_frame(), "must be");
1329 // fr is now pointing to the entry frame.
1330 callee_method = methodHandle(current, fr.entry_frame_call_wrapper()->callee_method());
1331 } else {
1332 Bytecodes::Code bc;
1333 CallInfo callinfo;
1334 find_callee_info_helper(vfst, bc, callinfo, CHECK_(methodHandle()));
1335 callee_method = methodHandle(current, callinfo.selected_method());
1336 }
1337 assert(callee_method()->is_method(), "must be");
1338 return callee_method;
1339 }
1340
1341 // Resolves a call.
1342 methodHandle SharedRuntime::resolve_helper(bool is_virtual, bool is_optimized, TRAPS) {
1343 JavaThread* current = THREAD;
1344 ResourceMark rm(current);
1345 RegisterMap cbl_map(current,
1346 RegisterMap::UpdateMap::skip,
1347 RegisterMap::ProcessFrames::include,
1348 RegisterMap::WalkContinuation::skip);
1349 frame caller_frame = current->last_frame().sender(&cbl_map);
1350
1351 CodeBlob* caller_cb = caller_frame.cb();
1352 guarantee(caller_cb != nullptr && caller_cb->is_nmethod(), "must be called from compiled method");
1353 nmethod* caller_nm = caller_cb->as_nmethod();
1354
1355 // determine call info & receiver
1356 // note: a) receiver is null for static calls
1357 // b) an exception is thrown if receiver is null for non-static calls
1358 CallInfo call_info;
1359 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1360 Handle receiver = find_callee_info(invoke_code, call_info, CHECK_(methodHandle()));
1361
1362 NoSafepointVerifier nsv;
1363
1364 methodHandle callee_method(current, call_info.selected_method());
1365
1366 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1367 (!is_virtual && invoke_code == Bytecodes::_invokespecial) ||
1368 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1369 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1370 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1371
1372 assert(!caller_nm->is_unloading(), "It should not be unloading");
1373
1374 #ifndef PRODUCT
1375 // tracing/debugging/statistics
1376 uint *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
1377 (is_virtual) ? (&_resolve_virtual_ctr) :
1378 (&_resolve_static_ctr);
1379 Atomic::inc(addr);
1380
1381 if (TraceCallFixup) {
1382 ResourceMark rm(current);
1383 tty->print("resolving %s%s (%s) call to",
1384 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
1385 Bytecodes::name(invoke_code));
1386 callee_method->print_short_name(tty);
1387 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT,
1388 p2i(caller_frame.pc()), p2i(callee_method->code()));
1389 }
1390 #endif
1391
1392 if (invoke_code == Bytecodes::_invokestatic) {
1393 assert(callee_method->method_holder()->is_initialized() ||
1394 callee_method->method_holder()->is_reentrant_initialization(current),
1395 "invalid class initialization state for invoke_static");
1396 if (!VM_Version::supports_fast_class_init_checks() && callee_method->needs_clinit_barrier()) {
1397 // In order to keep class initialization check, do not patch call
1398 // site for static call when the class is not fully initialized.
1399 // Proper check is enforced by call site re-resolution on every invocation.
1400 //
1401 // When fast class initialization checks are supported (VM_Version::supports_fast_class_init_checks() == true),
1402 // explicit class initialization check is put in nmethod entry (VEP).
1403 assert(callee_method->method_holder()->is_linked(), "must be");
1404 return callee_method;
1405 }
1406 }
1407
1408
1409 // JSR 292 key invariant:
1410 // If the resolved method is a MethodHandle invoke target, the call
1411 // site must be a MethodHandle call site, because the lambda form might tail-call
1412 // leaving the stack in a state unknown to either caller or callee
1413
1414 // Compute entry points. The computation of the entry points is independent of
1415 // patching the call.
1416
1417 // Make sure the callee nmethod does not get deoptimized and removed before
1418 // we are done patching the code.
1419
1420
1421 CompiledICLocker ml(caller_nm);
1422 if (is_virtual && !is_optimized) {
1423 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1424 inline_cache->update(&call_info, receiver->klass());
1425 } else {
1426 // Callsite is a direct call - set it to the destination method
1427 CompiledDirectCall* callsite = CompiledDirectCall::before(caller_frame.pc());
1428 callsite->set(callee_method);
1429 }
1430
1431 return callee_method;
1432 }
1433
1434 // Inline caches exist only in compiled code
1435 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* current))
1436 #ifdef ASSERT
1437 RegisterMap reg_map(current,
1438 RegisterMap::UpdateMap::skip,
1439 RegisterMap::ProcessFrames::include,
1440 RegisterMap::WalkContinuation::skip);
1441 frame stub_frame = current->last_frame();
1442 assert(stub_frame.is_runtime_frame(), "sanity check");
1443 frame caller_frame = stub_frame.sender(®_map);
1444 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame() && !caller_frame.is_upcall_stub_frame(), "unexpected frame");
1445 #endif /* ASSERT */
1446
1447 methodHandle callee_method;
1448 JRT_BLOCK
1449 callee_method = SharedRuntime::handle_ic_miss_helper(CHECK_NULL);
1450 // Return Method* through TLS
1451 current->set_vm_result_metadata(callee_method());
1452 JRT_BLOCK_END
1453 // return compiled code entry point after potential safepoints
1454 return get_resolved_entry(current, callee_method);
1455 JRT_END
1456
1457
1458 // Handle call site that has been made non-entrant
1459 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* current))
1460 // 6243940 We might end up in here if the callee is deoptimized
1461 // as we race to call it. We don't want to take a safepoint if
1462 // the caller was interpreted because the caller frame will look
1463 // interpreted to the stack walkers and arguments are now
1464 // "compiled" so it is much better to make this transition
1465 // invisible to the stack walking code. The i2c path will
1466 // place the callee method in the callee_target. It is stashed
1467 // there because if we try and find the callee by normal means a
1468 // safepoint is possible and have trouble gc'ing the compiled args.
1469 RegisterMap reg_map(current,
1470 RegisterMap::UpdateMap::skip,
1471 RegisterMap::ProcessFrames::include,
1472 RegisterMap::WalkContinuation::skip);
1473 frame stub_frame = current->last_frame();
1474 assert(stub_frame.is_runtime_frame(), "sanity check");
1475 frame caller_frame = stub_frame.sender(®_map);
1476
1477 if (caller_frame.is_interpreted_frame() ||
1478 caller_frame.is_entry_frame() ||
1479 caller_frame.is_upcall_stub_frame()) {
1480 Method* callee = current->callee_target();
1481 guarantee(callee != nullptr && callee->is_method(), "bad handshake");
1482 current->set_vm_result_metadata(callee);
1483 current->set_callee_target(nullptr);
1484 if (caller_frame.is_entry_frame() && VM_Version::supports_fast_class_init_checks()) {
1485 // Bypass class initialization checks in c2i when caller is in native.
1486 // JNI calls to static methods don't have class initialization checks.
1487 // Fast class initialization checks are present in c2i adapters and call into
1488 // SharedRuntime::handle_wrong_method() on the slow path.
1489 //
1490 // JVM upcalls may land here as well, but there's a proper check present in
1491 // LinkResolver::resolve_static_call (called from JavaCalls::call_static),
1492 // so bypassing it in c2i adapter is benign.
1493 return callee->get_c2i_no_clinit_check_entry();
1494 } else {
1495 return callee->get_c2i_entry();
1496 }
1497 }
1498
1499 // Must be compiled to compiled path which is safe to stackwalk
1500 methodHandle callee_method;
1501 JRT_BLOCK
1502 // Force resolving of caller (if we called from compiled frame)
1503 callee_method = SharedRuntime::reresolve_call_site(CHECK_NULL);
1504 current->set_vm_result_metadata(callee_method());
1505 JRT_BLOCK_END
1506 // return compiled code entry point after potential safepoints
1507 return get_resolved_entry(current, callee_method);
1508 JRT_END
1509
1510 // Handle abstract method call
1511 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* current))
1512 // Verbose error message for AbstractMethodError.
1513 // Get the called method from the invoke bytecode.
1514 vframeStream vfst(current, true);
1515 assert(!vfst.at_end(), "Java frame must exist");
1516 methodHandle caller(current, vfst.method());
1517 Bytecode_invoke invoke(caller, vfst.bci());
1518 DEBUG_ONLY( invoke.verify(); )
1519
1520 // Find the compiled caller frame.
1521 RegisterMap reg_map(current,
1522 RegisterMap::UpdateMap::include,
1523 RegisterMap::ProcessFrames::include,
1524 RegisterMap::WalkContinuation::skip);
1525 frame stubFrame = current->last_frame();
1526 assert(stubFrame.is_runtime_frame(), "must be");
1527 frame callerFrame = stubFrame.sender(®_map);
1528 assert(callerFrame.is_compiled_frame(), "must be");
1529
1530 // Install exception and return forward entry.
1531 address res = SharedRuntime::throw_AbstractMethodError_entry();
1532 JRT_BLOCK
1533 methodHandle callee(current, invoke.static_target(current));
1534 if (!callee.is_null()) {
1535 oop recv = callerFrame.retrieve_receiver(®_map);
1536 Klass *recv_klass = (recv != nullptr) ? recv->klass() : nullptr;
1537 res = StubRoutines::forward_exception_entry();
1538 LinkResolver::throw_abstract_method_error(callee, recv_klass, CHECK_(res));
1539 }
1540 JRT_BLOCK_END
1541 return res;
1542 JRT_END
1543
1544 // return verified_code_entry if interp_only_mode is not set for the current thread;
1545 // otherwise return c2i entry.
1546 address SharedRuntime::get_resolved_entry(JavaThread* current, methodHandle callee_method) {
1547 if (current->is_interp_only_mode() && !callee_method->is_special_native_intrinsic()) {
1548 // In interp_only_mode we need to go to the interpreted entry
1549 // The c2i won't patch in this mode -- see fixup_callers_callsite
1550 return callee_method->get_c2i_entry();
1551 }
1552 assert(callee_method->verified_code_entry() != nullptr, " Jump to zero!");
1553 return callee_method->verified_code_entry();
1554 }
1555
1556 // resolve a static call and patch code
1557 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread* current ))
1558 methodHandle callee_method;
1559 bool enter_special = false;
1560 JRT_BLOCK
1561 callee_method = SharedRuntime::resolve_helper(false, false, CHECK_NULL);
1562 current->set_vm_result_metadata(callee_method());
1563 JRT_BLOCK_END
1564 // return compiled code entry point after potential safepoints
1565 return get_resolved_entry(current, callee_method);
1566 JRT_END
1567
1568 // resolve virtual call and update inline cache to monomorphic
1569 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread* current))
1570 methodHandle callee_method;
1571 JRT_BLOCK
1572 callee_method = SharedRuntime::resolve_helper(true, false, CHECK_NULL);
1573 current->set_vm_result_metadata(callee_method());
1574 JRT_BLOCK_END
1575 // return compiled code entry point after potential safepoints
1576 return get_resolved_entry(current, callee_method);
1577 JRT_END
1578
1579
1580 // Resolve a virtual call that can be statically bound (e.g., always
1581 // monomorphic, so it has no inline cache). Patch code to resolved target.
1582 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread* current))
1583 methodHandle callee_method;
1584 JRT_BLOCK
1585 callee_method = SharedRuntime::resolve_helper(true, true, CHECK_NULL);
1586 current->set_vm_result_metadata(callee_method());
1587 JRT_BLOCK_END
1588 // return compiled code entry point after potential safepoints
1589 return get_resolved_entry(current, callee_method);
1590 JRT_END
1591
1592 methodHandle SharedRuntime::handle_ic_miss_helper(TRAPS) {
1593 JavaThread* current = THREAD;
1594 ResourceMark rm(current);
1595 CallInfo call_info;
1596 Bytecodes::Code bc;
1597
1598 // receiver is null for static calls. An exception is thrown for null
1599 // receivers for non-static calls
1600 Handle receiver = find_callee_info(bc, call_info, CHECK_(methodHandle()));
1601
1602 methodHandle callee_method(current, call_info.selected_method());
1603
1604 #ifndef PRODUCT
1605 Atomic::inc(&_ic_miss_ctr);
1606
1607 // Statistics & Tracing
1608 if (TraceCallFixup) {
1609 ResourceMark rm(current);
1610 tty->print("IC miss (%s) call to", Bytecodes::name(bc));
1611 callee_method->print_short_name(tty);
1612 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1613 }
1614
1615 if (ICMissHistogram) {
1616 MutexLocker m(VMStatistic_lock);
1617 RegisterMap reg_map(current,
1618 RegisterMap::UpdateMap::skip,
1619 RegisterMap::ProcessFrames::include,
1620 RegisterMap::WalkContinuation::skip);
1621 frame f = current->last_frame().real_sender(®_map);// skip runtime stub
1622 // produce statistics under the lock
1623 trace_ic_miss(f.pc());
1624 }
1625 #endif
1626
1627 // install an event collector so that when a vtable stub is created the
1628 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1629 // event can't be posted when the stub is created as locks are held
1630 // - instead the event will be deferred until the event collector goes
1631 // out of scope.
1632 JvmtiDynamicCodeEventCollector event_collector;
1633
1634 // Update inline cache to megamorphic. Skip update if we are called from interpreted.
1635 RegisterMap reg_map(current,
1636 RegisterMap::UpdateMap::skip,
1637 RegisterMap::ProcessFrames::include,
1638 RegisterMap::WalkContinuation::skip);
1639 frame caller_frame = current->last_frame().sender(®_map);
1640 CodeBlob* cb = caller_frame.cb();
1641 nmethod* caller_nm = cb->as_nmethod();
1642
1643 CompiledICLocker ml(caller_nm);
1644 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1645 inline_cache->update(&call_info, receiver()->klass());
1646
1647 return callee_method;
1648 }
1649
1650 //
1651 // Resets a call-site in compiled code so it will get resolved again.
1652 // This routines handles both virtual call sites, optimized virtual call
1653 // sites, and static call sites. Typically used to change a call sites
1654 // destination from compiled to interpreted.
1655 //
1656 methodHandle SharedRuntime::reresolve_call_site(TRAPS) {
1657 JavaThread* current = THREAD;
1658 ResourceMark rm(current);
1659 RegisterMap reg_map(current,
1660 RegisterMap::UpdateMap::skip,
1661 RegisterMap::ProcessFrames::include,
1662 RegisterMap::WalkContinuation::skip);
1663 frame stub_frame = current->last_frame();
1664 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1665 frame caller = stub_frame.sender(®_map);
1666
1667 // Do nothing if the frame isn't a live compiled frame.
1668 // nmethod could be deoptimized by the time we get here
1669 // so no update to the caller is needed.
1670
1671 if ((caller.is_compiled_frame() && !caller.is_deoptimized_frame()) ||
1672 (caller.is_native_frame() && caller.cb()->as_nmethod()->method()->is_continuation_enter_intrinsic())) {
1673
1674 address pc = caller.pc();
1675
1676 nmethod* caller_nm = CodeCache::find_nmethod(pc);
1677 assert(caller_nm != nullptr, "did not find caller nmethod");
1678
1679 // Default call_addr is the location of the "basic" call.
1680 // Determine the address of the call we a reresolving. With
1681 // Inline Caches we will always find a recognizable call.
1682 // With Inline Caches disabled we may or may not find a
1683 // recognizable call. We will always find a call for static
1684 // calls and for optimized virtual calls. For vanilla virtual
1685 // calls it depends on the state of the UseInlineCaches switch.
1686 //
1687 // With Inline Caches disabled we can get here for a virtual call
1688 // for two reasons:
1689 // 1 - calling an abstract method. The vtable for abstract methods
1690 // will run us thru handle_wrong_method and we will eventually
1691 // end up in the interpreter to throw the ame.
1692 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1693 // call and between the time we fetch the entry address and
1694 // we jump to it the target gets deoptimized. Similar to 1
1695 // we will wind up in the interprter (thru a c2i with c2).
1696 //
1697 CompiledICLocker ml(caller_nm);
1698 address call_addr = caller_nm->call_instruction_address(pc);
1699
1700 if (call_addr != nullptr) {
1701 // On x86 the logic for finding a call instruction is blindly checking for a call opcode 5
1702 // bytes back in the instruction stream so we must also check for reloc info.
1703 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1704 bool ret = iter.next(); // Get item
1705 if (ret) {
1706 switch (iter.type()) {
1707 case relocInfo::static_call_type:
1708 case relocInfo::opt_virtual_call_type: {
1709 CompiledDirectCall* cdc = CompiledDirectCall::at(call_addr);
1710 cdc->set_to_clean();
1711 break;
1712 }
1713
1714 case relocInfo::virtual_call_type: {
1715 // compiled, dispatched call (which used to call an interpreted method)
1716 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1717 inline_cache->set_to_clean();
1718 break;
1719 }
1720 default:
1721 break;
1722 }
1723 }
1724 }
1725 }
1726
1727 methodHandle callee_method = find_callee_method(CHECK_(methodHandle()));
1728
1729
1730 #ifndef PRODUCT
1731 Atomic::inc(&_wrong_method_ctr);
1732
1733 if (TraceCallFixup) {
1734 ResourceMark rm(current);
1735 tty->print("handle_wrong_method reresolving call to");
1736 callee_method->print_short_name(tty);
1737 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1738 }
1739 #endif
1740
1741 return callee_method;
1742 }
1743
1744 address SharedRuntime::handle_unsafe_access(JavaThread* thread, address next_pc) {
1745 // The faulting unsafe accesses should be changed to throw the error
1746 // synchronously instead. Meanwhile the faulting instruction will be
1747 // skipped over (effectively turning it into a no-op) and an
1748 // asynchronous exception will be raised which the thread will
1749 // handle at a later point. If the instruction is a load it will
1750 // return garbage.
1751
1752 // Request an async exception.
1753 thread->set_pending_unsafe_access_error();
1754
1755 // Return address of next instruction to execute.
1756 return next_pc;
1757 }
1758
1759 #ifdef ASSERT
1760 void SharedRuntime::check_member_name_argument_is_last_argument(const methodHandle& method,
1761 const BasicType* sig_bt,
1762 const VMRegPair* regs) {
1763 ResourceMark rm;
1764 const int total_args_passed = method->size_of_parameters();
1765 const VMRegPair* regs_with_member_name = regs;
1766 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1);
1767
1768 const int member_arg_pos = total_args_passed - 1;
1769 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob");
1770 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object");
1771
1772 java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1);
1773
1774 for (int i = 0; i < member_arg_pos; i++) {
1775 VMReg a = regs_with_member_name[i].first();
1776 VMReg b = regs_without_member_name[i].first();
1777 assert(a->value() == b->value(), "register allocation mismatch: a= %d, b= %d", a->value(), b->value());
1778 }
1779 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg");
1780 }
1781 #endif
1782
1783 // ---------------------------------------------------------------------------
1784 // We are calling the interpreter via a c2i. Normally this would mean that
1785 // we were called by a compiled method. However we could have lost a race
1786 // where we went int -> i2c -> c2i and so the caller could in fact be
1787 // interpreted. If the caller is compiled we attempt to patch the caller
1788 // so he no longer calls into the interpreter.
1789 JRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc))
1790 AARCH64_PORT_ONLY(assert(pauth_ptr_is_raw(caller_pc), "should be raw"));
1791
1792 // It's possible that deoptimization can occur at a call site which hasn't
1793 // been resolved yet, in which case this function will be called from
1794 // an nmethod that has been patched for deopt and we can ignore the
1795 // request for a fixup.
1796 // Also it is possible that we lost a race in that from_compiled_entry
1797 // is now back to the i2c in that case we don't need to patch and if
1798 // we did we'd leap into space because the callsite needs to use
1799 // "to interpreter" stub in order to load up the Method*. Don't
1800 // ask me how I know this...
1801
1802 // Result from nmethod::is_unloading is not stable across safepoints.
1803 NoSafepointVerifier nsv;
1804
1805 nmethod* callee = method->code();
1806 if (callee == nullptr) {
1807 return;
1808 }
1809
1810 // write lock needed because we might patch call site by set_to_clean()
1811 // and is_unloading() can modify nmethod's state
1812 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, JavaThread::current()));
1813
1814 CodeBlob* cb = CodeCache::find_blob(caller_pc);
1815 if (cb == nullptr || !cb->is_nmethod() || !callee->is_in_use() || callee->is_unloading()) {
1816 return;
1817 }
1818
1819 // The check above makes sure this is an nmethod.
1820 nmethod* caller = cb->as_nmethod();
1821
1822 // Get the return PC for the passed caller PC.
1823 address return_pc = caller_pc + frame::pc_return_offset;
1824
1825 if (!caller->is_in_use() || !NativeCall::is_call_before(return_pc)) {
1826 return;
1827 }
1828
1829 // Expect to find a native call there (unless it was no-inline cache vtable dispatch)
1830 CompiledICLocker ic_locker(caller);
1831 ResourceMark rm;
1832
1833 // If we got here through a static call or opt_virtual call, then we know where the
1834 // call address would be; let's peek at it
1835 address callsite_addr = (address)nativeCall_before(return_pc);
1836 RelocIterator iter(caller, callsite_addr, callsite_addr + 1);
1837 if (!iter.next()) {
1838 // No reloc entry found; not a static or optimized virtual call
1839 return;
1840 }
1841
1842 relocInfo::relocType type = iter.reloc()->type();
1843 if (type != relocInfo::static_call_type &&
1844 type != relocInfo::opt_virtual_call_type) {
1845 return;
1846 }
1847
1848 CompiledDirectCall* callsite = CompiledDirectCall::before(return_pc);
1849 callsite->set_to_clean();
1850 JRT_END
1851
1852
1853 // same as JVM_Arraycopy, but called directly from compiled code
1854 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos,
1855 oopDesc* dest, jint dest_pos,
1856 jint length,
1857 JavaThread* current)) {
1858 #ifndef PRODUCT
1859 _slow_array_copy_ctr++;
1860 #endif
1861 // Check if we have null pointers
1862 if (src == nullptr || dest == nullptr) {
1863 THROW(vmSymbols::java_lang_NullPointerException());
1864 }
1865 // Do the copy. The casts to arrayOop are necessary to the copy_array API,
1866 // even though the copy_array API also performs dynamic checks to ensure
1867 // that src and dest are truly arrays (and are conformable).
1868 // The copy_array mechanism is awkward and could be removed, but
1869 // the compilers don't call this function except as a last resort,
1870 // so it probably doesn't matter.
1871 src->klass()->copy_array((arrayOopDesc*)src, src_pos,
1872 (arrayOopDesc*)dest, dest_pos,
1873 length, current);
1874 }
1875 JRT_END
1876
1877 // The caller of generate_class_cast_message() (or one of its callers)
1878 // must use a ResourceMark in order to correctly free the result.
1879 char* SharedRuntime::generate_class_cast_message(
1880 JavaThread* thread, Klass* caster_klass) {
1881
1882 // Get target class name from the checkcast instruction
1883 vframeStream vfst(thread, true);
1884 assert(!vfst.at_end(), "Java frame must exist");
1885 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci()));
1886 constantPoolHandle cpool(thread, vfst.method()->constants());
1887 Klass* target_klass = ConstantPool::klass_at_if_loaded(cpool, cc.index());
1888 Symbol* target_klass_name = nullptr;
1889 if (target_klass == nullptr) {
1890 // This klass should be resolved, but just in case, get the name in the klass slot.
1891 target_klass_name = cpool->klass_name_at(cc.index());
1892 }
1893 return generate_class_cast_message(caster_klass, target_klass, target_klass_name);
1894 }
1895
1896
1897 // The caller of generate_class_cast_message() (or one of its callers)
1898 // must use a ResourceMark in order to correctly free the result.
1899 char* SharedRuntime::generate_class_cast_message(
1900 Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name) {
1901 const char* caster_name = caster_klass->external_name();
1902
1903 assert(target_klass != nullptr || target_klass_name != nullptr, "one must be provided");
1904 const char* target_name = target_klass == nullptr ? target_klass_name->as_klass_external_name() :
1905 target_klass->external_name();
1906
1907 size_t msglen = strlen(caster_name) + strlen("class ") + strlen(" cannot be cast to class ") + strlen(target_name) + 1;
1908
1909 const char* caster_klass_description = "";
1910 const char* target_klass_description = "";
1911 const char* klass_separator = "";
1912 if (target_klass != nullptr && caster_klass->module() == target_klass->module()) {
1913 caster_klass_description = caster_klass->joint_in_module_of_loader(target_klass);
1914 } else {
1915 caster_klass_description = caster_klass->class_in_module_of_loader();
1916 target_klass_description = (target_klass != nullptr) ? target_klass->class_in_module_of_loader() : "";
1917 klass_separator = (target_klass != nullptr) ? "; " : "";
1918 }
1919
1920 // add 3 for parenthesis and preceding space
1921 msglen += strlen(caster_klass_description) + strlen(target_klass_description) + strlen(klass_separator) + 3;
1922
1923 char* message = NEW_RESOURCE_ARRAY_RETURN_NULL(char, msglen);
1924 if (message == nullptr) {
1925 // Shouldn't happen, but don't cause even more problems if it does
1926 message = const_cast<char*>(caster_klass->external_name());
1927 } else {
1928 jio_snprintf(message,
1929 msglen,
1930 "class %s cannot be cast to class %s (%s%s%s)",
1931 caster_name,
1932 target_name,
1933 caster_klass_description,
1934 klass_separator,
1935 target_klass_description
1936 );
1937 }
1938 return message;
1939 }
1940
1941 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
1942 (void) JavaThread::current()->stack_overflow_state()->reguard_stack();
1943 JRT_END
1944
1945 void SharedRuntime::monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* current) {
1946 if (!SafepointSynchronize::is_synchronizing()) {
1947 // Only try quick_enter() if we're not trying to reach a safepoint
1948 // so that the calling thread reaches the safepoint more quickly.
1949 if (ObjectSynchronizer::quick_enter(obj, lock, current)) {
1950 return;
1951 }
1952 }
1953 // NO_ASYNC required because an async exception on the state transition destructor
1954 // would leave you with the lock held and it would never be released.
1955 // The normal monitorenter NullPointerException is thrown without acquiring a lock
1956 // and the model is that an exception implies the method failed.
1957 JRT_BLOCK_NO_ASYNC
1958 Handle h_obj(THREAD, obj);
1959 ObjectSynchronizer::enter(h_obj, lock, current);
1960 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
1961 JRT_BLOCK_END
1962 }
1963
1964 // Handles the uncommon case in locking, i.e., contention or an inflated lock.
1965 JRT_BLOCK_ENTRY(void, SharedRuntime::complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current))
1966 SharedRuntime::monitor_enter_helper(obj, lock, current);
1967 JRT_END
1968
1969 void SharedRuntime::monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current) {
1970 assert(JavaThread::current() == current, "invariant");
1971 // Exit must be non-blocking, and therefore no exceptions can be thrown.
1972 ExceptionMark em(current);
1973
1974 // Check if C2_MacroAssembler::fast_unlock() or
1975 // C2_MacroAssembler::fast_unlock_lightweight() unlocked an inflated
1976 // monitor before going slow path. Since there is no safepoint
1977 // polling when calling into the VM, we can be sure that the monitor
1978 // hasn't been deallocated.
1979 ObjectMonitor* m = current->unlocked_inflated_monitor();
1980 if (m != nullptr) {
1981 assert(!m->has_owner(current), "must be");
1982 current->clear_unlocked_inflated_monitor();
1983
1984 // We need to reacquire the lock before we can call ObjectSynchronizer::exit().
1985 if (!m->try_enter(current, /*check_for_recursion*/ false)) {
1986 // Some other thread acquired the lock (or the monitor was
1987 // deflated). Either way we are done.
1988 current->dec_held_monitor_count();
1989 return;
1990 }
1991 }
1992
1993 // The object could become unlocked through a JNI call, which we have no other checks for.
1994 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
1995 if (obj->is_unlocked()) {
1996 if (CheckJNICalls) {
1997 fatal("Object has been unlocked by JNI");
1998 }
1999 return;
2000 }
2001 ObjectSynchronizer::exit(obj, lock, current);
2002 }
2003
2004 // Handles the uncommon cases of monitor unlocking in compiled code
2005 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current))
2006 assert(current == JavaThread::current(), "pre-condition");
2007 SharedRuntime::monitor_exit_helper(obj, lock, current);
2008 JRT_END
2009
2010 // This is only called when CheckJNICalls is true, and only
2011 // for virtual thread termination.
2012 JRT_LEAF(void, SharedRuntime::log_jni_monitor_still_held())
2013 assert(CheckJNICalls, "Only call this when checking JNI usage");
2014 if (log_is_enabled(Debug, jni)) {
2015 JavaThread* current = JavaThread::current();
2016 int64_t vthread_id = java_lang_Thread::thread_id(current->vthread());
2017 int64_t carrier_id = java_lang_Thread::thread_id(current->threadObj());
2018 log_debug(jni)("VirtualThread (tid: " INT64_FORMAT ", carrier id: " INT64_FORMAT
2019 ") exiting with Objects still locked by JNI MonitorEnter.",
2020 vthread_id, carrier_id);
2021 }
2022 JRT_END
2023
2024 #ifndef PRODUCT
2025
2026 void SharedRuntime::print_statistics() {
2027 ttyLocker ttyl;
2028 if (xtty != nullptr) xtty->head("statistics type='SharedRuntime'");
2029
2030 SharedRuntime::print_ic_miss_histogram();
2031
2032 // Dump the JRT_ENTRY counters
2033 if (_new_instance_ctr) tty->print_cr("%5u new instance requires GC", _new_instance_ctr);
2034 if (_new_array_ctr) tty->print_cr("%5u new array requires GC", _new_array_ctr);
2035 if (_multi2_ctr) tty->print_cr("%5u multianewarray 2 dim", _multi2_ctr);
2036 if (_multi3_ctr) tty->print_cr("%5u multianewarray 3 dim", _multi3_ctr);
2037 if (_multi4_ctr) tty->print_cr("%5u multianewarray 4 dim", _multi4_ctr);
2038 if (_multi5_ctr) tty->print_cr("%5u multianewarray 5 dim", _multi5_ctr);
2039
2040 tty->print_cr("%5u inline cache miss in compiled", _ic_miss_ctr);
2041 tty->print_cr("%5u wrong method", _wrong_method_ctr);
2042 tty->print_cr("%5u unresolved static call site", _resolve_static_ctr);
2043 tty->print_cr("%5u unresolved virtual call site", _resolve_virtual_ctr);
2044 tty->print_cr("%5u unresolved opt virtual call site", _resolve_opt_virtual_ctr);
2045
2046 if (_mon_enter_stub_ctr) tty->print_cr("%5u monitor enter stub", _mon_enter_stub_ctr);
2047 if (_mon_exit_stub_ctr) tty->print_cr("%5u monitor exit stub", _mon_exit_stub_ctr);
2048 if (_mon_enter_ctr) tty->print_cr("%5u monitor enter slow", _mon_enter_ctr);
2049 if (_mon_exit_ctr) tty->print_cr("%5u monitor exit slow", _mon_exit_ctr);
2050 if (_partial_subtype_ctr) tty->print_cr("%5u slow partial subtype", _partial_subtype_ctr);
2051 if (_jbyte_array_copy_ctr) tty->print_cr("%5u byte array copies", _jbyte_array_copy_ctr);
2052 if (_jshort_array_copy_ctr) tty->print_cr("%5u short array copies", _jshort_array_copy_ctr);
2053 if (_jint_array_copy_ctr) tty->print_cr("%5u int array copies", _jint_array_copy_ctr);
2054 if (_jlong_array_copy_ctr) tty->print_cr("%5u long array copies", _jlong_array_copy_ctr);
2055 if (_oop_array_copy_ctr) tty->print_cr("%5u oop array copies", _oop_array_copy_ctr);
2056 if (_checkcast_array_copy_ctr) tty->print_cr("%5u checkcast array copies", _checkcast_array_copy_ctr);
2057 if (_unsafe_array_copy_ctr) tty->print_cr("%5u unsafe array copies", _unsafe_array_copy_ctr);
2058 if (_generic_array_copy_ctr) tty->print_cr("%5u generic array copies", _generic_array_copy_ctr);
2059 if (_slow_array_copy_ctr) tty->print_cr("%5u slow array copies", _slow_array_copy_ctr);
2060 if (_find_handler_ctr) tty->print_cr("%5u find exception handler", _find_handler_ctr);
2061 if (_rethrow_ctr) tty->print_cr("%5u rethrow handler", _rethrow_ctr);
2062 if (_unsafe_set_memory_ctr) tty->print_cr("%5u unsafe set memorys", _unsafe_set_memory_ctr);
2063
2064 AdapterHandlerLibrary::print_statistics();
2065
2066 if (xtty != nullptr) xtty->tail("statistics");
2067 }
2068
2069 inline double percent(int64_t x, int64_t y) {
2070 return 100.0 * (double)x / (double)MAX2(y, (int64_t)1);
2071 }
2072
2073 class MethodArityHistogram {
2074 public:
2075 enum { MAX_ARITY = 256 };
2076 private:
2077 static uint64_t _arity_histogram[MAX_ARITY]; // histogram of #args
2078 static uint64_t _size_histogram[MAX_ARITY]; // histogram of arg size in words
2079 static uint64_t _total_compiled_calls;
2080 static uint64_t _max_compiled_calls_per_method;
2081 static int _max_arity; // max. arity seen
2082 static int _max_size; // max. arg size seen
2083
2084 static void add_method_to_histogram(nmethod* nm) {
2085 Method* method = (nm == nullptr) ? nullptr : nm->method();
2086 if (method != nullptr) {
2087 ArgumentCount args(method->signature());
2088 int arity = args.size() + (method->is_static() ? 0 : 1);
2089 int argsize = method->size_of_parameters();
2090 arity = MIN2(arity, MAX_ARITY-1);
2091 argsize = MIN2(argsize, MAX_ARITY-1);
2092 uint64_t count = (uint64_t)method->compiled_invocation_count();
2093 _max_compiled_calls_per_method = count > _max_compiled_calls_per_method ? count : _max_compiled_calls_per_method;
2094 _total_compiled_calls += count;
2095 _arity_histogram[arity] += count;
2096 _size_histogram[argsize] += count;
2097 _max_arity = MAX2(_max_arity, arity);
2098 _max_size = MAX2(_max_size, argsize);
2099 }
2100 }
2101
2102 void print_histogram_helper(int n, uint64_t* histo, const char* name) {
2103 const int N = MIN2(9, n);
2104 double sum = 0;
2105 double weighted_sum = 0;
2106 for (int i = 0; i <= n; i++) { sum += (double)histo[i]; weighted_sum += (double)(i*histo[i]); }
2107 if (sum >= 1) { // prevent divide by zero or divide overflow
2108 double rest = sum;
2109 double percent = sum / 100;
2110 for (int i = 0; i <= N; i++) {
2111 rest -= (double)histo[i];
2112 tty->print_cr("%4d: " UINT64_FORMAT_W(12) " (%5.1f%%)", i, histo[i], (double)histo[i] / percent);
2113 }
2114 tty->print_cr("rest: " INT64_FORMAT_W(12) " (%5.1f%%)", (int64_t)rest, rest / percent);
2115 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n);
2116 tty->print_cr("(total # of compiled calls = " INT64_FORMAT_W(14) ")", _total_compiled_calls);
2117 tty->print_cr("(max # of compiled calls = " INT64_FORMAT_W(14) ")", _max_compiled_calls_per_method);
2118 } else {
2119 tty->print_cr("Histogram generation failed for %s. n = %d, sum = %7.5f", name, n, sum);
2120 }
2121 }
2122
2123 void print_histogram() {
2124 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2125 print_histogram_helper(_max_arity, _arity_histogram, "arity");
2126 tty->print_cr("\nHistogram of parameter block size (in words, incl. rcvr):");
2127 print_histogram_helper(_max_size, _size_histogram, "size");
2128 tty->cr();
2129 }
2130
2131 public:
2132 MethodArityHistogram() {
2133 // Take the Compile_lock to protect against changes in the CodeBlob structures
2134 MutexLocker mu1(Compile_lock, Mutex::_safepoint_check_flag);
2135 // Take the CodeCache_lock to protect against changes in the CodeHeap structure
2136 MutexLocker mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2137 _max_arity = _max_size = 0;
2138 _total_compiled_calls = 0;
2139 _max_compiled_calls_per_method = 0;
2140 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram[i] = 0;
2141 CodeCache::nmethods_do(add_method_to_histogram);
2142 print_histogram();
2143 }
2144 };
2145
2146 uint64_t MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY];
2147 uint64_t MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY];
2148 uint64_t MethodArityHistogram::_total_compiled_calls;
2149 uint64_t MethodArityHistogram::_max_compiled_calls_per_method;
2150 int MethodArityHistogram::_max_arity;
2151 int MethodArityHistogram::_max_size;
2152
2153 void SharedRuntime::print_call_statistics(uint64_t comp_total) {
2154 tty->print_cr("Calls from compiled code:");
2155 int64_t total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls;
2156 int64_t mono_c = _nof_normal_calls - _nof_megamorphic_calls;
2157 int64_t mono_i = _nof_interface_calls;
2158 tty->print_cr("\t" INT64_FORMAT_W(12) " (100%%) total non-inlined ", total);
2159 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.1f%%) |- virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total));
2160 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls));
2161 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- monomorphic ", mono_c, percent(mono_c, _nof_normal_calls));
2162 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls));
2163 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.1f%%) |- interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total));
2164 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls));
2165 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- monomorphic ", mono_i, percent(mono_i, _nof_interface_calls));
2166 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.1f%%) |- static/special calls", _nof_static_calls, percent(_nof_static_calls, total));
2167 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls));
2168 tty->cr();
2169 tty->print_cr("Note 1: counter updates are not MT-safe.");
2170 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
2171 tty->print_cr(" %% in nested categories are relative to their category");
2172 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
2173 tty->cr();
2174
2175 MethodArityHistogram h;
2176 }
2177 #endif
2178
2179 #ifndef PRODUCT
2180 static int _lookups; // number of calls to lookup
2181 static int _equals; // number of buckets checked with matching hash
2182 static int _archived_hits; // number of successful lookups in archived table
2183 static int _runtime_hits; // number of successful lookups in runtime table
2184 #endif
2185
2186 // A simple wrapper class around the calling convention information
2187 // that allows sharing of adapters for the same calling convention.
2188 class AdapterFingerPrint : public MetaspaceObj {
2189 private:
2190 enum {
2191 _basic_type_bits = 4,
2192 _basic_type_mask = right_n_bits(_basic_type_bits),
2193 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2194 };
2195 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2196 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2197
2198 int _length;
2199
2200 static int data_offset() { return sizeof(AdapterFingerPrint); }
2201 int* data_pointer() {
2202 return (int*)((address)this + data_offset());
2203 }
2204
2205 // Private construtor. Use allocate() to get an instance.
2206 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt, int len) {
2207 int* data = data_pointer();
2208 // Pack the BasicTypes with 8 per int
2209 assert(len == length(total_args_passed), "sanity");
2210 _length = len;
2211 int sig_index = 0;
2212 for (int index = 0; index < _length; index++) {
2213 int value = 0;
2214 for (int byte = 0; sig_index < total_args_passed && byte < _basic_types_per_int; byte++) {
2215 int bt = adapter_encoding(sig_bt[sig_index++]);
2216 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits");
2217 value = (value << _basic_type_bits) | bt;
2218 }
2219 data[index] = value;
2220 }
2221 }
2222
2223 // Call deallocate instead
2224 ~AdapterFingerPrint() {
2225 ShouldNotCallThis();
2226 }
2227
2228 static int length(int total_args) {
2229 return (total_args + (_basic_types_per_int-1)) / _basic_types_per_int;
2230 }
2231
2232 static int compute_size_in_words(int len) {
2233 return (int)heap_word_size(sizeof(AdapterFingerPrint) + (len * sizeof(int)));
2234 }
2235
2236 // Remap BasicTypes that are handled equivalently by the adapters.
2237 // These are correct for the current system but someday it might be
2238 // necessary to make this mapping platform dependent.
2239 static int adapter_encoding(BasicType in) {
2240 switch (in) {
2241 case T_BOOLEAN:
2242 case T_BYTE:
2243 case T_SHORT:
2244 case T_CHAR:
2245 // There are all promoted to T_INT in the calling convention
2246 return T_INT;
2247
2248 case T_OBJECT:
2249 case T_ARRAY:
2250 // In other words, we assume that any register good enough for
2251 // an int or long is good enough for a managed pointer.
2252 #ifdef _LP64
2253 return T_LONG;
2254 #else
2255 return T_INT;
2256 #endif
2257
2258 case T_INT:
2259 case T_LONG:
2260 case T_FLOAT:
2261 case T_DOUBLE:
2262 case T_VOID:
2263 return in;
2264
2265 default:
2266 ShouldNotReachHere();
2267 return T_CONFLICT;
2268 }
2269 }
2270
2271 void* operator new(size_t size, size_t fp_size) throw() {
2272 assert(fp_size >= size, "sanity check");
2273 void* p = AllocateHeap(fp_size, mtCode);
2274 memset(p, 0, fp_size);
2275 return p;
2276 }
2277
2278 template<typename Function>
2279 void iterate_args(Function function) {
2280 for (int i = 0; i < length(); i++) {
2281 unsigned val = (unsigned)value(i);
2282 // args are packed so that first/lower arguments are in the highest
2283 // bits of each int value, so iterate from highest to the lowest
2284 for (int j = 32 - _basic_type_bits; j >= 0; j -= _basic_type_bits) {
2285 unsigned v = (val >> j) & _basic_type_mask;
2286 if (v == 0) {
2287 continue;
2288 }
2289 function(v);
2290 }
2291 }
2292 }
2293
2294 public:
2295 static AdapterFingerPrint* allocate(int total_args_passed, BasicType* sig_bt) {
2296 int len = length(total_args_passed);
2297 int size_in_bytes = BytesPerWord * compute_size_in_words(len);
2298 AdapterFingerPrint* afp = new (size_in_bytes) AdapterFingerPrint(total_args_passed, sig_bt, len);
2299 assert((afp->size() * BytesPerWord) == size_in_bytes, "should match");
2300 return afp;
2301 }
2302
2303 static void deallocate(AdapterFingerPrint* fp) {
2304 FreeHeap(fp);
2305 }
2306
2307 int value(int index) {
2308 int* data = data_pointer();
2309 return data[index];
2310 }
2311
2312 int length() {
2313 return _length;
2314 }
2315
2316 unsigned int compute_hash() {
2317 int hash = 0;
2318 for (int i = 0; i < length(); i++) {
2319 int v = value(i);
2320 //Add arithmetic operation to the hash, like +3 to improve hashing
2321 hash = ((hash << 8) ^ v ^ (hash >> 5)) + 3;
2322 }
2323 return (unsigned int)hash;
2324 }
2325
2326 const char* as_string() {
2327 stringStream st;
2328 st.print("0x");
2329 for (int i = 0; i < length(); i++) {
2330 st.print("%x", value(i));
2331 }
2332 return st.as_string();
2333 }
2334
2335 const char* as_basic_args_string() {
2336 stringStream st;
2337 bool long_prev = false;
2338 iterate_args([&] (int arg) {
2339 if (long_prev) {
2340 long_prev = false;
2341 if (arg == T_VOID) {
2342 st.print("J");
2343 } else {
2344 st.print("L");
2345 }
2346 }
2347 switch (arg) {
2348 case T_INT: st.print("I"); break;
2349 case T_LONG: long_prev = true; break;
2350 case T_FLOAT: st.print("F"); break;
2351 case T_DOUBLE: st.print("D"); break;
2352 case T_VOID: break;
2353 default: ShouldNotReachHere();
2354 }
2355 });
2356 if (long_prev) {
2357 st.print("L");
2358 }
2359 return st.as_string();
2360 }
2361
2362 BasicType* as_basic_type(int& nargs) {
2363 nargs = 0;
2364 GrowableArray<BasicType> btarray;
2365 bool long_prev = false;
2366
2367 iterate_args([&] (int arg) {
2368 if (long_prev) {
2369 long_prev = false;
2370 if (arg == T_VOID) {
2371 btarray.append(T_LONG);
2372 } else {
2373 btarray.append(T_OBJECT); // it could be T_ARRAY; it shouldn't matter
2374 }
2375 }
2376 switch (arg) {
2377 case T_INT: // fallthrough
2378 case T_FLOAT: // fallthrough
2379 case T_DOUBLE:
2380 case T_VOID:
2381 btarray.append((BasicType)arg);
2382 break;
2383 case T_LONG:
2384 long_prev = true;
2385 break;
2386 default: ShouldNotReachHere();
2387 }
2388 });
2389
2390 if (long_prev) {
2391 btarray.append(T_OBJECT);
2392 }
2393
2394 nargs = btarray.length();
2395 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, nargs);
2396 int index = 0;
2397 GrowableArrayIterator<BasicType> iter = btarray.begin();
2398 while (iter != btarray.end()) {
2399 sig_bt[index++] = *iter;
2400 ++iter;
2401 }
2402 assert(index == btarray.length(), "sanity check");
2403 #ifdef ASSERT
2404 {
2405 AdapterFingerPrint* compare_fp = AdapterFingerPrint::allocate(nargs, sig_bt);
2406 assert(this->equals(compare_fp), "sanity check");
2407 AdapterFingerPrint::deallocate(compare_fp);
2408 }
2409 #endif
2410 return sig_bt;
2411 }
2412
2413 bool equals(AdapterFingerPrint* other) {
2414 if (other->_length != _length) {
2415 return false;
2416 } else {
2417 for (int i = 0; i < _length; i++) {
2418 if (value(i) != other->value(i)) {
2419 return false;
2420 }
2421 }
2422 }
2423 return true;
2424 }
2425
2426 // methods required by virtue of being a MetaspaceObj
2427 void metaspace_pointers_do(MetaspaceClosure* it) { return; /* nothing to do here */ }
2428 int size() const { return compute_size_in_words(_length); }
2429 MetaspaceObj::Type type() const { return AdapterFingerPrintType; }
2430
2431 static bool equals(AdapterFingerPrint* const& fp1, AdapterFingerPrint* const& fp2) {
2432 NOT_PRODUCT(_equals++);
2433 return fp1->equals(fp2);
2434 }
2435
2436 static unsigned int compute_hash(AdapterFingerPrint* const& fp) {
2437 return fp->compute_hash();
2438 }
2439 };
2440
2441 #if INCLUDE_CDS
2442 static inline bool adapter_fp_equals_compact_hashtable_entry(AdapterHandlerEntry* entry, AdapterFingerPrint* fp, int len_unused) {
2443 return AdapterFingerPrint::equals(entry->fingerprint(), fp);
2444 }
2445
2446 class ArchivedAdapterTable : public OffsetCompactHashtable<
2447 AdapterFingerPrint*,
2448 AdapterHandlerEntry*,
2449 adapter_fp_equals_compact_hashtable_entry> {};
2450 #endif // INCLUDE_CDS
2451
2452 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
2453 using AdapterHandlerTable = ResourceHashtable<AdapterFingerPrint*, AdapterHandlerEntry*, 293,
2454 AnyObj::C_HEAP, mtCode,
2455 AdapterFingerPrint::compute_hash,
2456 AdapterFingerPrint::equals>;
2457 static AdapterHandlerTable* _adapter_handler_table;
2458 static GrowableArray<AdapterHandlerEntry*>* _adapter_handler_list = nullptr;
2459
2460 // Find a entry with the same fingerprint if it exists
2461 AdapterHandlerEntry* AdapterHandlerLibrary::lookup(int total_args_passed, BasicType* sig_bt) {
2462 NOT_PRODUCT(_lookups++);
2463 assert_lock_strong(AdapterHandlerLibrary_lock);
2464 AdapterFingerPrint* fp = AdapterFingerPrint::allocate(total_args_passed, sig_bt);
2465 AdapterHandlerEntry* entry = nullptr;
2466 #if INCLUDE_CDS
2467 // if we are building the archive then the archived adapter table is
2468 // not valid and we need to use the ones added to the runtime table
2469 if (AOTCodeCache::is_using_adapter()) {
2470 // Search archived table first. It is read-only table so can be searched without lock
2471 entry = _aot_adapter_handler_table.lookup(fp, fp->compute_hash(), 0 /* unused */);
2472 #ifndef PRODUCT
2473 if (entry != nullptr) {
2474 _archived_hits++;
2475 }
2476 #endif
2477 }
2478 #endif // INCLUDE_CDS
2479 if (entry == nullptr) {
2480 assert_lock_strong(AdapterHandlerLibrary_lock);
2481 AdapterHandlerEntry** entry_p = _adapter_handler_table->get(fp);
2482 if (entry_p != nullptr) {
2483 entry = *entry_p;
2484 assert(entry->fingerprint()->equals(fp), "fingerprint mismatch key fp %s %s (hash=%d) != found fp %s %s (hash=%d)",
2485 entry->fingerprint()->as_basic_args_string(), entry->fingerprint()->as_string(), entry->fingerprint()->compute_hash(),
2486 fp->as_basic_args_string(), fp->as_string(), fp->compute_hash());
2487 #ifndef PRODUCT
2488 _runtime_hits++;
2489 #endif
2490 }
2491 }
2492 AdapterFingerPrint::deallocate(fp);
2493 return entry;
2494 }
2495
2496 #ifndef PRODUCT
2497 static void print_table_statistics() {
2498 auto size = [&] (AdapterFingerPrint* key, AdapterHandlerEntry* a) {
2499 return sizeof(*key) + sizeof(*a);
2500 };
2501 TableStatistics ts = _adapter_handler_table->statistics_calculate(size);
2502 ts.print(tty, "AdapterHandlerTable");
2503 tty->print_cr("AdapterHandlerTable (table_size=%d, entries=%d)",
2504 _adapter_handler_table->table_size(), _adapter_handler_table->number_of_entries());
2505 int total_hits = _archived_hits + _runtime_hits;
2506 tty->print_cr("AdapterHandlerTable: lookups %d equals %d hits %d (archived=%d+runtime=%d)",
2507 _lookups, _equals, total_hits, _archived_hits, _runtime_hits);
2508 }
2509 #endif
2510
2511 // ---------------------------------------------------------------------------
2512 // Implementation of AdapterHandlerLibrary
2513 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = nullptr;
2514 AdapterHandlerEntry* AdapterHandlerLibrary::_no_arg_handler = nullptr;
2515 AdapterHandlerEntry* AdapterHandlerLibrary::_int_arg_handler = nullptr;
2516 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_arg_handler = nullptr;
2517 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_int_arg_handler = nullptr;
2518 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_obj_arg_handler = nullptr;
2519 #if INCLUDE_CDS
2520 ArchivedAdapterTable AdapterHandlerLibrary::_aot_adapter_handler_table;
2521 #endif // INCLUDE_CDS
2522 static const int AdapterHandlerLibrary_size = 16*K;
2523 BufferBlob* AdapterHandlerLibrary::_buffer = nullptr;
2524
2525 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2526 assert(_buffer != nullptr, "should be initialized");
2527 return _buffer;
2528 }
2529
2530 static void post_adapter_creation(const AdapterBlob* new_adapter,
2531 const AdapterHandlerEntry* entry) {
2532 if (Forte::is_enabled() || JvmtiExport::should_post_dynamic_code_generated()) {
2533 char blob_id[256];
2534 jio_snprintf(blob_id,
2535 sizeof(blob_id),
2536 "%s(%s)",
2537 new_adapter->name(),
2538 entry->fingerprint()->as_string());
2539 if (Forte::is_enabled()) {
2540 Forte::register_stub(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2541 }
2542
2543 if (JvmtiExport::should_post_dynamic_code_generated()) {
2544 JvmtiExport::post_dynamic_code_generated(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2545 }
2546 }
2547 }
2548
2549 void AdapterHandlerLibrary::create_abstract_method_handler() {
2550 assert_lock_strong(AdapterHandlerLibrary_lock);
2551 // Create a special handler for abstract methods. Abstract methods
2552 // are never compiled so an i2c entry is somewhat meaningless, but
2553 // throw AbstractMethodError just in case.
2554 // Pass wrong_method_abstract for the c2i transitions to return
2555 // AbstractMethodError for invalid invocations.
2556 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
2557 _abstract_method_handler = AdapterHandlerLibrary::new_entry(AdapterFingerPrint::allocate(0, nullptr));
2558 _abstract_method_handler->set_entry_points(SharedRuntime::throw_AbstractMethodError_entry(),
2559 wrong_method_abstract,
2560 wrong_method_abstract,
2561 nullptr);
2562 }
2563
2564 void AdapterHandlerLibrary::initialize() {
2565 {
2566 ResourceMark rm;
2567 MutexLocker mu(AdapterHandlerLibrary_lock);
2568 _adapter_handler_table = new (mtCode) AdapterHandlerTable();
2569 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2570 create_abstract_method_handler();
2571 }
2572
2573 #if INCLUDE_CDS
2574 // Link adapters in AOT Cache to their code in AOT Code Cache
2575 if (AOTCodeCache::is_using_adapter() && !_aot_adapter_handler_table.empty()) {
2576 link_aot_adapters();
2577 lookup_simple_adapters();
2578 return;
2579 }
2580 #endif // INCLUDE_CDS
2581
2582 ResourceMark rm;
2583 AdapterBlob* no_arg_blob = nullptr;
2584 AdapterBlob* int_arg_blob = nullptr;
2585 AdapterBlob* obj_arg_blob = nullptr;
2586 AdapterBlob* obj_int_arg_blob = nullptr;
2587 AdapterBlob* obj_obj_arg_blob = nullptr;
2588 {
2589 MutexLocker mu(AdapterHandlerLibrary_lock);
2590
2591 _no_arg_handler = create_adapter(no_arg_blob, 0, nullptr);
2592
2593 BasicType obj_args[] = { T_OBJECT };
2594 _obj_arg_handler = create_adapter(obj_arg_blob, 1, obj_args);
2595
2596 BasicType int_args[] = { T_INT };
2597 _int_arg_handler = create_adapter(int_arg_blob, 1, int_args);
2598
2599 BasicType obj_int_args[] = { T_OBJECT, T_INT };
2600 _obj_int_arg_handler = create_adapter(obj_int_arg_blob, 2, obj_int_args);
2601
2602 BasicType obj_obj_args[] = { T_OBJECT, T_OBJECT };
2603 _obj_obj_arg_handler = create_adapter(obj_obj_arg_blob, 2, obj_obj_args);
2604
2605 assert(no_arg_blob != nullptr &&
2606 obj_arg_blob != nullptr &&
2607 int_arg_blob != nullptr &&
2608 obj_int_arg_blob != nullptr &&
2609 obj_obj_arg_blob != nullptr, "Initial adapters must be properly created");
2610 }
2611
2612 // Outside of the lock
2613 post_adapter_creation(no_arg_blob, _no_arg_handler);
2614 post_adapter_creation(obj_arg_blob, _obj_arg_handler);
2615 post_adapter_creation(int_arg_blob, _int_arg_handler);
2616 post_adapter_creation(obj_int_arg_blob, _obj_int_arg_handler);
2617 post_adapter_creation(obj_obj_arg_blob, _obj_obj_arg_handler);
2618 }
2619
2620 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint) {
2621 return AdapterHandlerEntry::allocate(fingerprint);
2622 }
2623
2624 AdapterHandlerEntry* AdapterHandlerLibrary::get_simple_adapter(const methodHandle& method) {
2625 if (method->is_abstract()) {
2626 return _abstract_method_handler;
2627 }
2628 int total_args_passed = method->size_of_parameters(); // All args on stack
2629 if (total_args_passed == 0) {
2630 return _no_arg_handler;
2631 } else if (total_args_passed == 1) {
2632 if (!method->is_static()) {
2633 return _obj_arg_handler;
2634 }
2635 switch (method->signature()->char_at(1)) {
2636 case JVM_SIGNATURE_CLASS:
2637 case JVM_SIGNATURE_ARRAY:
2638 return _obj_arg_handler;
2639 case JVM_SIGNATURE_INT:
2640 case JVM_SIGNATURE_BOOLEAN:
2641 case JVM_SIGNATURE_CHAR:
2642 case JVM_SIGNATURE_BYTE:
2643 case JVM_SIGNATURE_SHORT:
2644 return _int_arg_handler;
2645 }
2646 } else if (total_args_passed == 2 &&
2647 !method->is_static()) {
2648 switch (method->signature()->char_at(1)) {
2649 case JVM_SIGNATURE_CLASS:
2650 case JVM_SIGNATURE_ARRAY:
2651 return _obj_obj_arg_handler;
2652 case JVM_SIGNATURE_INT:
2653 case JVM_SIGNATURE_BOOLEAN:
2654 case JVM_SIGNATURE_CHAR:
2655 case JVM_SIGNATURE_BYTE:
2656 case JVM_SIGNATURE_SHORT:
2657 return _obj_int_arg_handler;
2658 }
2659 }
2660 return nullptr;
2661 }
2662
2663 class AdapterSignatureIterator : public SignatureIterator {
2664 private:
2665 BasicType stack_sig_bt[16];
2666 BasicType* sig_bt;
2667 int index;
2668
2669 public:
2670 AdapterSignatureIterator(Symbol* signature,
2671 fingerprint_t fingerprint,
2672 bool is_static,
2673 int total_args_passed) :
2674 SignatureIterator(signature, fingerprint),
2675 index(0)
2676 {
2677 sig_bt = (total_args_passed <= 16) ? stack_sig_bt : NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2678 if (!is_static) { // Pass in receiver first
2679 sig_bt[index++] = T_OBJECT;
2680 }
2681 do_parameters_on(this);
2682 }
2683
2684 BasicType* basic_types() {
2685 return sig_bt;
2686 }
2687
2688 #ifdef ASSERT
2689 int slots() {
2690 return index;
2691 }
2692 #endif
2693
2694 private:
2695
2696 friend class SignatureIterator; // so do_parameters_on can call do_type
2697 void do_type(BasicType type) {
2698 sig_bt[index++] = type;
2699 if (type == T_LONG || type == T_DOUBLE) {
2700 sig_bt[index++] = T_VOID; // Longs & doubles take 2 Java slots
2701 }
2702 }
2703 };
2704
2705
2706 const char* AdapterHandlerEntry::_entry_names[] = {
2707 "i2c", "c2i", "c2i_unverified", "c2i_no_clinit_check"
2708 };
2709
2710 #ifdef ASSERT
2711 void AdapterHandlerLibrary::verify_adapter_sharing(int total_args_passed, BasicType* sig_bt, AdapterHandlerEntry* cached_entry) {
2712 AdapterBlob* comparison_blob = nullptr;
2713 AdapterHandlerEntry* comparison_entry = create_adapter(comparison_blob, total_args_passed, sig_bt, true);
2714 assert(comparison_blob == nullptr, "no blob should be created when creating an adapter for comparison");
2715 assert(comparison_entry->compare_code(cached_entry), "code must match");
2716 // Release the one just created
2717 AdapterHandlerEntry::deallocate(comparison_entry);
2718 }
2719 #endif /* ASSERT*/
2720
2721 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) {
2722 // Use customized signature handler. Need to lock around updates to
2723 // the _adapter_handler_table (it is not safe for concurrent readers
2724 // and a single writer: this could be fixed if it becomes a
2725 // problem).
2726
2727 // Fast-path for trivial adapters
2728 AdapterHandlerEntry* entry = get_simple_adapter(method);
2729 if (entry != nullptr) {
2730 return entry;
2731 }
2732
2733 ResourceMark rm;
2734 AdapterBlob* adapter_blob = nullptr;
2735
2736 // Fill in the signature array, for the calling-convention call.
2737 int total_args_passed = method->size_of_parameters(); // All args on stack
2738
2739 AdapterSignatureIterator si(method->signature(), method->constMethod()->fingerprint(),
2740 method->is_static(), total_args_passed);
2741 assert(si.slots() == total_args_passed, "");
2742 BasicType* sig_bt = si.basic_types();
2743 {
2744 MutexLocker mu(AdapterHandlerLibrary_lock);
2745
2746 // Lookup method signature's fingerprint
2747 entry = lookup(total_args_passed, sig_bt);
2748
2749 if (entry != nullptr) {
2750 assert(entry->is_linked(), "AdapterHandlerEntry must have been linked");
2751 #ifdef ASSERT
2752 if (!entry->is_shared() && VerifyAdapterSharing) {
2753 verify_adapter_sharing(total_args_passed, sig_bt, entry);
2754 }
2755 #endif
2756 } else {
2757 entry = create_adapter(adapter_blob, total_args_passed, sig_bt);
2758 }
2759 }
2760
2761 // Outside of the lock
2762 if (adapter_blob != nullptr) {
2763 post_adapter_creation(adapter_blob, entry);
2764 }
2765 return entry;
2766 }
2767
2768 AdapterBlob* AdapterHandlerLibrary::lookup_aot_cache(AdapterHandlerEntry* handler) {
2769 ResourceMark rm;
2770 const char* name = AdapterHandlerLibrary::name(handler->fingerprint());
2771 const uint32_t id = AdapterHandlerLibrary::id(handler->fingerprint());
2772 int offsets[AdapterHandlerEntry::ENTRIES_COUNT];
2773
2774 AdapterBlob* adapter_blob = nullptr;
2775 CodeBlob* blob = AOTCodeCache::load_code_blob(AOTCodeEntry::Adapter, id, name, AdapterHandlerEntry::ENTRIES_COUNT, offsets);
2776 if (blob != nullptr) {
2777 adapter_blob = blob->as_adapter_blob();
2778 address i2c_entry = adapter_blob->content_begin();
2779 assert(offsets[0] == 0, "sanity check");
2780 handler->set_entry_points(i2c_entry, i2c_entry + offsets[1], i2c_entry + offsets[2], i2c_entry + offsets[3]);
2781 }
2782 return adapter_blob;
2783 }
2784
2785 #ifndef PRODUCT
2786 void AdapterHandlerLibrary::print_adapter_handler_info(outputStream* st, AdapterHandlerEntry* handler, AdapterBlob* adapter_blob) {
2787 ttyLocker ttyl;
2788 ResourceMark rm;
2789 int insts_size = adapter_blob->code_size();
2790 handler->print_adapter_on(tty);
2791 st->print_cr("i2c argument handler for: %s %s (%d bytes generated)",
2792 handler->fingerprint()->as_basic_args_string(),
2793 handler->fingerprint()->as_string(), insts_size);
2794 st->print_cr("c2i argument handler starts at " INTPTR_FORMAT, p2i(handler->get_c2i_entry()));
2795 if (Verbose || PrintStubCode) {
2796 address first_pc = handler->base_address();
2797 if (first_pc != nullptr) {
2798 Disassembler::decode(first_pc, first_pc + insts_size, st, &adapter_blob->asm_remarks());
2799 st->cr();
2800 }
2801 }
2802 }
2803 #endif // PRODUCT
2804
2805 bool AdapterHandlerLibrary::generate_adapter_code(AdapterBlob*& adapter_blob,
2806 AdapterHandlerEntry* handler,
2807 int total_args_passed,
2808 BasicType* sig_bt,
2809 bool is_transient) {
2810 if (log_is_enabled(Info, perf, class, link)) {
2811 ClassLoader::perf_method_adapters_count()->inc();
2812 }
2813
2814 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2815 CodeBuffer buffer(buf);
2816 short buffer_locs[20];
2817 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
2818 sizeof(buffer_locs)/sizeof(relocInfo));
2819 MacroAssembler masm(&buffer);
2820 VMRegPair stack_regs[16];
2821 VMRegPair* regs = (total_args_passed <= 16) ? stack_regs : NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2822
2823 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
2824 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed);
2825 SharedRuntime::generate_i2c2i_adapters(&masm,
2826 total_args_passed,
2827 comp_args_on_stack,
2828 sig_bt,
2829 regs,
2830 handler);
2831 #ifdef ASSERT
2832 if (VerifyAdapterSharing) {
2833 handler->save_code(buf->code_begin(), buffer.insts_size());
2834 if (is_transient) {
2835 return true;
2836 }
2837 }
2838 #endif
2839
2840 adapter_blob = AdapterBlob::create(&buffer);
2841 if (adapter_blob == nullptr) {
2842 // CodeCache is full, disable compilation
2843 // Ought to log this but compile log is only per compile thread
2844 // and we're some non descript Java thread.
2845 return false;
2846 }
2847 if (!is_transient && AOTCodeCache::is_dumping_adapter()) {
2848 // try to save generated code
2849 const char* name = AdapterHandlerLibrary::name(handler->fingerprint());
2850 const uint32_t id = AdapterHandlerLibrary::id(handler->fingerprint());
2851 int entry_offset[AdapterHandlerEntry::ENTRIES_COUNT];
2852 assert(AdapterHandlerEntry::ENTRIES_COUNT == 4, "sanity");
2853 address i2c_entry = handler->get_i2c_entry();
2854 entry_offset[0] = 0; // i2c_entry offset
2855 entry_offset[1] = handler->get_c2i_entry() - i2c_entry;
2856 entry_offset[2] = handler->get_c2i_unverified_entry() - i2c_entry;
2857 entry_offset[3] = handler->get_c2i_no_clinit_check_entry() - i2c_entry;
2858 bool success = AOTCodeCache::store_code_blob(*adapter_blob, AOTCodeEntry::Adapter, id, name, AdapterHandlerEntry::ENTRIES_COUNT, entry_offset);
2859 assert(success || !AOTCodeCache::is_dumping_adapter(), "caching of adapter must be disabled");
2860 }
2861 handler->relocate(adapter_blob->content_begin());
2862 #ifndef PRODUCT
2863 // debugging support
2864 if (PrintAdapterHandlers || PrintStubCode) {
2865 print_adapter_handler_info(tty, handler, adapter_blob);
2866 }
2867 #endif
2868 return true;
2869 }
2870
2871 AdapterHandlerEntry* AdapterHandlerLibrary::create_adapter(AdapterBlob*& adapter_blob,
2872 int total_args_passed,
2873 BasicType* sig_bt,
2874 bool is_transient) {
2875 AdapterFingerPrint* fp = AdapterFingerPrint::allocate(total_args_passed, sig_bt);
2876 AdapterHandlerEntry* handler = AdapterHandlerLibrary::new_entry(fp);
2877 if (!generate_adapter_code(adapter_blob, handler, total_args_passed, sig_bt, is_transient)) {
2878 AdapterHandlerEntry::deallocate(handler);
2879 return nullptr;
2880 }
2881 if (!is_transient) {
2882 assert_lock_strong(AdapterHandlerLibrary_lock);
2883 _adapter_handler_table->put(fp, handler);
2884 }
2885 return handler;
2886 }
2887
2888 #if INCLUDE_CDS
2889 void AdapterHandlerEntry::remove_unshareable_info() {
2890 #ifdef ASSERT
2891 _saved_code = nullptr;
2892 _saved_code_length = 0;
2893 #endif // ASSERT
2894 set_entry_points(nullptr, nullptr, nullptr, nullptr, false);
2895 }
2896
2897 class CopyAdapterTableToArchive : StackObj {
2898 private:
2899 CompactHashtableWriter* _writer;
2900 ArchiveBuilder* _builder;
2901 public:
2902 CopyAdapterTableToArchive(CompactHashtableWriter* writer) : _writer(writer),
2903 _builder(ArchiveBuilder::current())
2904 {}
2905
2906 bool do_entry(AdapterFingerPrint* fp, AdapterHandlerEntry* entry) {
2907 LogStreamHandle(Trace, aot) lsh;
2908 if (ArchiveBuilder::current()->has_been_archived((address)entry)) {
2909 assert(ArchiveBuilder::current()->has_been_archived((address)fp), "must be");
2910 AdapterFingerPrint* buffered_fp = ArchiveBuilder::current()->get_buffered_addr(fp);
2911 assert(buffered_fp != nullptr,"sanity check");
2912 AdapterHandlerEntry* buffered_entry = ArchiveBuilder::current()->get_buffered_addr(entry);
2913 assert(buffered_entry != nullptr,"sanity check");
2914
2915 uint hash = fp->compute_hash();
2916 u4 delta = _builder->buffer_to_offset_u4((address)buffered_entry);
2917 _writer->add(hash, delta);
2918 if (lsh.is_enabled()) {
2919 address fp_runtime_addr = (address)buffered_fp + ArchiveBuilder::current()->buffer_to_requested_delta();
2920 address entry_runtime_addr = (address)buffered_entry + ArchiveBuilder::current()->buffer_to_requested_delta();
2921 log_trace(aot)("Added fp=%p (%s), entry=%p to the archived adater table", buffered_fp, buffered_fp->as_basic_args_string(), buffered_entry);
2922 }
2923 } else {
2924 if (lsh.is_enabled()) {
2925 log_trace(aot)("Skipping adapter handler %p (fp=%s) as it is not archived", entry, fp->as_basic_args_string());
2926 }
2927 }
2928 return true;
2929 }
2930 };
2931
2932 void AdapterHandlerLibrary::dump_aot_adapter_table() {
2933 CompactHashtableStats stats;
2934 CompactHashtableWriter writer(_adapter_handler_table->number_of_entries(), &stats);
2935 CopyAdapterTableToArchive copy(&writer);
2936 _adapter_handler_table->iterate(©);
2937 writer.dump(&_aot_adapter_handler_table, "archived adapter table");
2938 }
2939
2940 void AdapterHandlerLibrary::serialize_shared_table_header(SerializeClosure* soc) {
2941 _aot_adapter_handler_table.serialize_header(soc);
2942 }
2943
2944 AdapterBlob* AdapterHandlerLibrary::link_aot_adapter_handler(AdapterHandlerEntry* handler) {
2945 #ifdef ASSERT
2946 if (TestAOTAdapterLinkFailure) {
2947 return nullptr;
2948 }
2949 #endif
2950 AdapterBlob* blob = lookup_aot_cache(handler);
2951 #ifndef PRODUCT
2952 // debugging support
2953 if ((blob != nullptr) && (PrintAdapterHandlers || PrintStubCode)) {
2954 print_adapter_handler_info(tty, handler, blob);
2955 }
2956 #endif
2957 return blob;
2958 }
2959
2960 // This method is used during production run to link archived adapters (stored in AOT Cache)
2961 // to their code in AOT Code Cache
2962 void AdapterHandlerEntry::link() {
2963 AdapterBlob* adapter_blob = nullptr;
2964 ResourceMark rm;
2965 assert(_fingerprint != nullptr, "_fingerprint must not be null");
2966 bool generate_code = false;
2967 // Generate code only if AOTCodeCache is not available, or
2968 // caching adapters is disabled, or we fail to link
2969 // the AdapterHandlerEntry to its code in the AOTCodeCache
2970 if (AOTCodeCache::is_using_adapter()) {
2971 adapter_blob = AdapterHandlerLibrary::link_aot_adapter_handler(this);
2972 if (adapter_blob == nullptr) {
2973 log_warning(aot)("Failed to link AdapterHandlerEntry (fp=%s) to its code in the AOT code cache", _fingerprint->as_basic_args_string());
2974 generate_code = true;
2975 }
2976 } else {
2977 generate_code = true;
2978 }
2979 if (generate_code) {
2980 int nargs;
2981 BasicType* bt = _fingerprint->as_basic_type(nargs);
2982 if (!AdapterHandlerLibrary::generate_adapter_code(adapter_blob, this, nargs, bt, /* is_transient */ false)) {
2983 // Don't throw exceptions during VM initialization because java.lang.* classes
2984 // might not have been initialized, causing problems when constructing the
2985 // Java exception object.
2986 vm_exit_during_initialization("Out of space in CodeCache for adapters");
2987 }
2988 }
2989 // Outside of the lock
2990 if (adapter_blob != nullptr) {
2991 post_adapter_creation(adapter_blob, this);
2992 }
2993 assert(_linked, "AdapterHandlerEntry must now be linked");
2994 }
2995
2996 void AdapterHandlerLibrary::link_aot_adapters() {
2997 assert(AOTCodeCache::is_using_adapter(), "AOT adapters code should be available");
2998 _aot_adapter_handler_table.iterate([](AdapterHandlerEntry* entry) {
2999 assert(!entry->is_linked(), "AdapterHandlerEntry is already linked!");
3000 entry->link();
3001 });
3002 }
3003
3004 // This method is called during production run to lookup simple adapters
3005 // in the archived adapter handler table
3006 void AdapterHandlerLibrary::lookup_simple_adapters() {
3007 assert(!_aot_adapter_handler_table.empty(), "archived adapter handler table is empty");
3008
3009 MutexLocker mu(AdapterHandlerLibrary_lock);
3010 _no_arg_handler = lookup(0, nullptr);
3011
3012 BasicType obj_args[] = { T_OBJECT };
3013 _obj_arg_handler = lookup(1, obj_args);
3014
3015 BasicType int_args[] = { T_INT };
3016 _int_arg_handler = lookup(1, int_args);
3017
3018 BasicType obj_int_args[] = { T_OBJECT, T_INT };
3019 _obj_int_arg_handler = lookup(2, obj_int_args);
3020
3021 BasicType obj_obj_args[] = { T_OBJECT, T_OBJECT };
3022 _obj_obj_arg_handler = lookup(2, obj_obj_args);
3023
3024 assert(_no_arg_handler != nullptr &&
3025 _obj_arg_handler != nullptr &&
3026 _int_arg_handler != nullptr &&
3027 _obj_int_arg_handler != nullptr &&
3028 _obj_obj_arg_handler != nullptr, "Initial adapters not found in archived adapter handler table");
3029 assert(_no_arg_handler->is_linked() &&
3030 _obj_arg_handler->is_linked() &&
3031 _int_arg_handler->is_linked() &&
3032 _obj_int_arg_handler->is_linked() &&
3033 _obj_obj_arg_handler->is_linked(), "Initial adapters not in linked state");
3034 }
3035 #endif // INCLUDE_CDS
3036
3037 address AdapterHandlerEntry::base_address() {
3038 address base = _i2c_entry;
3039 if (base == nullptr) base = _c2i_entry;
3040 assert(base <= _c2i_entry || _c2i_entry == nullptr, "");
3041 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == nullptr, "");
3042 assert(base <= _c2i_no_clinit_check_entry || _c2i_no_clinit_check_entry == nullptr, "");
3043 return base;
3044 }
3045
3046 void AdapterHandlerEntry::relocate(address new_base) {
3047 address old_base = base_address();
3048 assert(old_base != nullptr, "");
3049 ptrdiff_t delta = new_base - old_base;
3050 if (_i2c_entry != nullptr)
3051 _i2c_entry += delta;
3052 if (_c2i_entry != nullptr)
3053 _c2i_entry += delta;
3054 if (_c2i_unverified_entry != nullptr)
3055 _c2i_unverified_entry += delta;
3056 if (_c2i_no_clinit_check_entry != nullptr)
3057 _c2i_no_clinit_check_entry += delta;
3058 assert(base_address() == new_base, "");
3059 }
3060
3061 void AdapterHandlerEntry::metaspace_pointers_do(MetaspaceClosure* it) {
3062 LogStreamHandle(Trace, aot) lsh;
3063 if (lsh.is_enabled()) {
3064 lsh.print("Iter(AdapterHandlerEntry): %p(%s)", this, _fingerprint->as_basic_args_string());
3065 lsh.cr();
3066 }
3067 it->push(&_fingerprint);
3068 }
3069
3070 AdapterHandlerEntry::~AdapterHandlerEntry() {
3071 if (_fingerprint != nullptr) {
3072 AdapterFingerPrint::deallocate(_fingerprint);
3073 _fingerprint = nullptr;
3074 }
3075 #ifdef ASSERT
3076 FREE_C_HEAP_ARRAY(unsigned char, _saved_code);
3077 #endif
3078 FreeHeap(this);
3079 }
3080
3081
3082 #ifdef ASSERT
3083 // Capture the code before relocation so that it can be compared
3084 // against other versions. If the code is captured after relocation
3085 // then relative instructions won't be equivalent.
3086 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
3087 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
3088 _saved_code_length = length;
3089 memcpy(_saved_code, buffer, length);
3090 }
3091
3092
3093 bool AdapterHandlerEntry::compare_code(AdapterHandlerEntry* other) {
3094 assert(_saved_code != nullptr && other->_saved_code != nullptr, "code not saved");
3095
3096 if (other->_saved_code_length != _saved_code_length) {
3097 return false;
3098 }
3099
3100 return memcmp(other->_saved_code, _saved_code, _saved_code_length) == 0;
3101 }
3102 #endif
3103
3104
3105 /**
3106 * Create a native wrapper for this native method. The wrapper converts the
3107 * Java-compiled calling convention to the native convention, handles
3108 * arguments, and transitions to native. On return from the native we transition
3109 * back to java blocking if a safepoint is in progress.
3110 */
3111 void AdapterHandlerLibrary::create_native_wrapper(const methodHandle& method) {
3112 ResourceMark rm;
3113 nmethod* nm = nullptr;
3114
3115 // Check if memory should be freed before allocation
3116 CodeCache::gc_on_allocation();
3117
3118 assert(method->is_native(), "must be native");
3119 assert(method->is_special_native_intrinsic() ||
3120 method->has_native_function(), "must have something valid to call!");
3121
3122 {
3123 // Perform the work while holding the lock, but perform any printing outside the lock
3124 MutexLocker mu(AdapterHandlerLibrary_lock);
3125 // See if somebody beat us to it
3126 if (method->code() != nullptr) {
3127 return;
3128 }
3129
3130 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci);
3131 assert(compile_id > 0, "Must generate native wrapper");
3132
3133
3134 ResourceMark rm;
3135 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
3136 if (buf != nullptr) {
3137 CodeBuffer buffer(buf);
3138
3139 if (method->is_continuation_enter_intrinsic()) {
3140 buffer.initialize_stubs_size(192);
3141 }
3142
3143 struct { double data[20]; } locs_buf;
3144 struct { double data[20]; } stubs_locs_buf;
3145 buffer.insts()->initialize_shared_locs((relocInfo*)&locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
3146 #if defined(AARCH64) || defined(PPC64)
3147 // On AArch64 with ZGC and nmethod entry barriers, we need all oops to be
3148 // in the constant pool to ensure ordering between the barrier and oops
3149 // accesses. For native_wrappers we need a constant.
3150 // On PPC64 the continuation enter intrinsic needs the constant pool for the compiled
3151 // static java call that is resolved in the runtime.
3152 if (PPC64_ONLY(method->is_continuation_enter_intrinsic() &&) true) {
3153 buffer.initialize_consts_size(8 PPC64_ONLY(+ 24));
3154 }
3155 #endif
3156 buffer.stubs()->initialize_shared_locs((relocInfo*)&stubs_locs_buf, sizeof(stubs_locs_buf) / sizeof(relocInfo));
3157 MacroAssembler _masm(&buffer);
3158
3159 // Fill in the signature array, for the calling-convention call.
3160 const int total_args_passed = method->size_of_parameters();
3161
3162 VMRegPair stack_regs[16];
3163 VMRegPair* regs = (total_args_passed <= 16) ? stack_regs : NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
3164
3165 AdapterSignatureIterator si(method->signature(), method->constMethod()->fingerprint(),
3166 method->is_static(), total_args_passed);
3167 BasicType* sig_bt = si.basic_types();
3168 assert(si.slots() == total_args_passed, "");
3169 BasicType ret_type = si.return_type();
3170
3171 // Now get the compiled-Java arguments layout.
3172 SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed);
3173
3174 // Generate the compiled-to-native wrapper code
3175 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type);
3176
3177 if (nm != nullptr) {
3178 {
3179 MutexLocker pl(NMethodState_lock, Mutex::_no_safepoint_check_flag);
3180 if (nm->make_in_use()) {
3181 method->set_code(method, nm);
3182 }
3183 }
3184
3185 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, CompileBroker::compiler(CompLevel_simple));
3186 if (directive->PrintAssemblyOption) {
3187 nm->print_code();
3188 }
3189 DirectivesStack::release(directive);
3190 }
3191 }
3192 } // Unlock AdapterHandlerLibrary_lock
3193
3194
3195 // Install the generated code.
3196 if (nm != nullptr) {
3197 const char *msg = method->is_static() ? "(static)" : "";
3198 CompileTask::print_ul(nm, msg);
3199 if (PrintCompilation) {
3200 ttyLocker ttyl;
3201 CompileTask::print(tty, nm, msg);
3202 }
3203 nm->post_compiled_method_load_event();
3204 }
3205 }
3206
3207 // -------------------------------------------------------------------------
3208 // Java-Java calling convention
3209 // (what you use when Java calls Java)
3210
3211 //------------------------------name_for_receiver----------------------------------
3212 // For a given signature, return the VMReg for parameter 0.
3213 VMReg SharedRuntime::name_for_receiver() {
3214 VMRegPair regs;
3215 BasicType sig_bt = T_OBJECT;
3216 (void) java_calling_convention(&sig_bt, ®s, 1);
3217 // Return argument 0 register. In the LP64 build pointers
3218 // take 2 registers, but the VM wants only the 'main' name.
3219 return regs.first();
3220 }
3221
3222 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) {
3223 // This method is returning a data structure allocating as a
3224 // ResourceObject, so do not put any ResourceMarks in here.
3225
3226 BasicType *sig_bt = NEW_RESOURCE_ARRAY(BasicType, 256);
3227 VMRegPair *regs = NEW_RESOURCE_ARRAY(VMRegPair, 256);
3228 int cnt = 0;
3229 if (has_receiver) {
3230 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature
3231 }
3232
3233 for (SignatureStream ss(sig); !ss.at_return_type(); ss.next()) {
3234 BasicType type = ss.type();
3235 sig_bt[cnt++] = type;
3236 if (is_double_word_type(type))
3237 sig_bt[cnt++] = T_VOID;
3238 }
3239
3240 if (has_appendix) {
3241 sig_bt[cnt++] = T_OBJECT;
3242 }
3243
3244 assert(cnt < 256, "grow table size");
3245
3246 int comp_args_on_stack;
3247 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt);
3248
3249 // the calling convention doesn't count out_preserve_stack_slots so
3250 // we must add that in to get "true" stack offsets.
3251
3252 if (comp_args_on_stack) {
3253 for (int i = 0; i < cnt; i++) {
3254 VMReg reg1 = regs[i].first();
3255 if (reg1->is_stack()) {
3256 // Yuck
3257 reg1 = reg1->bias(out_preserve_stack_slots());
3258 }
3259 VMReg reg2 = regs[i].second();
3260 if (reg2->is_stack()) {
3261 // Yuck
3262 reg2 = reg2->bias(out_preserve_stack_slots());
3263 }
3264 regs[i].set_pair(reg2, reg1);
3265 }
3266 }
3267
3268 // results
3269 *arg_size = cnt;
3270 return regs;
3271 }
3272
3273 // OSR Migration Code
3274 //
3275 // This code is used convert interpreter frames into compiled frames. It is
3276 // called from very start of a compiled OSR nmethod. A temp array is
3277 // allocated to hold the interesting bits of the interpreter frame. All
3278 // active locks are inflated to allow them to move. The displaced headers and
3279 // active interpreter locals are copied into the temp buffer. Then we return
3280 // back to the compiled code. The compiled code then pops the current
3281 // interpreter frame off the stack and pushes a new compiled frame. Then it
3282 // copies the interpreter locals and displaced headers where it wants.
3283 // Finally it calls back to free the temp buffer.
3284 //
3285 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed.
3286
3287 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *current) )
3288 assert(current == JavaThread::current(), "pre-condition");
3289 JFR_ONLY(Jfr::check_and_process_sample_request(current);)
3290 // During OSR migration, we unwind the interpreted frame and replace it with a compiled
3291 // frame. The stack watermark code below ensures that the interpreted frame is processed
3292 // before it gets unwound. This is helpful as the size of the compiled frame could be
3293 // larger than the interpreted frame, which could result in the new frame not being
3294 // processed correctly.
3295 StackWatermarkSet::before_unwind(current);
3296
3297 //
3298 // This code is dependent on the memory layout of the interpreter local
3299 // array and the monitors. On all of our platforms the layout is identical
3300 // so this code is shared. If some platform lays the their arrays out
3301 // differently then this code could move to platform specific code or
3302 // the code here could be modified to copy items one at a time using
3303 // frame accessor methods and be platform independent.
3304
3305 frame fr = current->last_frame();
3306 assert(fr.is_interpreted_frame(), "");
3307 assert(fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks");
3308
3309 // Figure out how many monitors are active.
3310 int active_monitor_count = 0;
3311 for (BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
3312 kptr < fr.interpreter_frame_monitor_begin();
3313 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
3314 if (kptr->obj() != nullptr) active_monitor_count++;
3315 }
3316
3317 // QQQ we could place number of active monitors in the array so that compiled code
3318 // could double check it.
3319
3320 Method* moop = fr.interpreter_frame_method();
3321 int max_locals = moop->max_locals();
3322 // Allocate temp buffer, 1 word per local & 2 per active monitor
3323 int buf_size_words = max_locals + active_monitor_count * BasicObjectLock::size();
3324 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode);
3325
3326 // Copy the locals. Order is preserved so that loading of longs works.
3327 // Since there's no GC I can copy the oops blindly.
3328 assert(sizeof(HeapWord)==sizeof(intptr_t), "fix this code");
3329 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
3330 (HeapWord*)&buf[0],
3331 max_locals);
3332
3333 // Inflate locks. Copy the displaced headers. Be careful, there can be holes.
3334 int i = max_locals;
3335 for (BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();
3336 kptr2 < fr.interpreter_frame_monitor_begin();
3337 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {
3338 if (kptr2->obj() != nullptr) { // Avoid 'holes' in the monitor array
3339 BasicLock *lock = kptr2->lock();
3340 if (LockingMode == LM_LEGACY) {
3341 // Inflate so the object's header no longer refers to the BasicLock.
3342 if (lock->displaced_header().is_unlocked()) {
3343 // The object is locked and the resulting ObjectMonitor* will also be
3344 // locked so it can't be async deflated until ownership is dropped.
3345 // See the big comment in basicLock.cpp: BasicLock::move_to().
3346 ObjectSynchronizer::inflate_helper(kptr2->obj());
3347 }
3348 // Now the displaced header is free to move because the
3349 // object's header no longer refers to it.
3350 buf[i] = (intptr_t)lock->displaced_header().value();
3351 } else if (UseObjectMonitorTable) {
3352 buf[i] = (intptr_t)lock->object_monitor_cache();
3353 }
3354 #ifdef ASSERT
3355 else {
3356 buf[i] = badDispHeaderOSR;
3357 }
3358 #endif
3359 i++;
3360 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj());
3361 }
3362 }
3363 assert(i - max_locals == active_monitor_count*2, "found the expected number of monitors");
3364
3365 RegisterMap map(current,
3366 RegisterMap::UpdateMap::skip,
3367 RegisterMap::ProcessFrames::include,
3368 RegisterMap::WalkContinuation::skip);
3369 frame sender = fr.sender(&map);
3370 if (sender.is_interpreted_frame()) {
3371 current->push_cont_fastpath(sender.sp());
3372 }
3373
3374 return buf;
3375 JRT_END
3376
3377 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) )
3378 FREE_C_HEAP_ARRAY(intptr_t, buf);
3379 JRT_END
3380
3381 bool AdapterHandlerLibrary::contains(const CodeBlob* b) {
3382 bool found = false;
3383 #if INCLUDE_CDS
3384 if (AOTCodeCache::is_using_adapter()) {
3385 auto findblob_archived_table = [&] (AdapterHandlerEntry* handler) {
3386 return (found = (b == CodeCache::find_blob(handler->get_i2c_entry())));
3387 };
3388 _aot_adapter_handler_table.iterate(findblob_archived_table);
3389 }
3390 #endif // INCLUDE_CDS
3391 if (!found) {
3392 auto findblob_runtime_table = [&] (AdapterFingerPrint* key, AdapterHandlerEntry* a) {
3393 return (found = (b == CodeCache::find_blob(a->get_i2c_entry())));
3394 };
3395 assert_locked_or_safepoint(AdapterHandlerLibrary_lock);
3396 _adapter_handler_table->iterate(findblob_runtime_table);
3397 }
3398 return found;
3399 }
3400
3401 const char* AdapterHandlerLibrary::name(AdapterFingerPrint* fingerprint) {
3402 return fingerprint->as_basic_args_string();
3403 }
3404
3405 uint32_t AdapterHandlerLibrary::id(AdapterFingerPrint* fingerprint) {
3406 unsigned int hash = fingerprint->compute_hash();
3407 return hash;
3408 }
3409
3410 void AdapterHandlerLibrary::print_handler_on(outputStream* st, const CodeBlob* b) {
3411 bool found = false;
3412 #if INCLUDE_CDS
3413 if (AOTCodeCache::is_using_adapter()) {
3414 auto findblob_archived_table = [&] (AdapterHandlerEntry* handler) {
3415 if (b == CodeCache::find_blob(handler->get_i2c_entry())) {
3416 found = true;
3417 st->print("Adapter for signature: ");
3418 handler->print_adapter_on(st);
3419 return true;
3420 } else {
3421 return false; // keep looking
3422 }
3423 };
3424 _aot_adapter_handler_table.iterate(findblob_archived_table);
3425 }
3426 #endif // INCLUDE_CDS
3427 if (!found) {
3428 auto findblob_runtime_table = [&] (AdapterFingerPrint* key, AdapterHandlerEntry* a) {
3429 if (b == CodeCache::find_blob(a->get_i2c_entry())) {
3430 found = true;
3431 st->print("Adapter for signature: ");
3432 a->print_adapter_on(st);
3433 return true;
3434 } else {
3435 return false; // keep looking
3436 }
3437 };
3438 assert_locked_or_safepoint(AdapterHandlerLibrary_lock);
3439 _adapter_handler_table->iterate(findblob_runtime_table);
3440 }
3441 assert(found, "Should have found handler");
3442 }
3443
3444 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
3445 st->print("AHE@" INTPTR_FORMAT ": %s", p2i(this), fingerprint()->as_string());
3446 if (get_i2c_entry() != nullptr) {
3447 st->print(" i2c: " INTPTR_FORMAT, p2i(get_i2c_entry()));
3448 }
3449 if (get_c2i_entry() != nullptr) {
3450 st->print(" c2i: " INTPTR_FORMAT, p2i(get_c2i_entry()));
3451 }
3452 if (get_c2i_unverified_entry() != nullptr) {
3453 st->print(" c2iUV: " INTPTR_FORMAT, p2i(get_c2i_unverified_entry()));
3454 }
3455 if (get_c2i_no_clinit_check_entry() != nullptr) {
3456 st->print(" c2iNCI: " INTPTR_FORMAT, p2i(get_c2i_no_clinit_check_entry()));
3457 }
3458 st->cr();
3459 }
3460
3461 #ifndef PRODUCT
3462
3463 void AdapterHandlerLibrary::print_statistics() {
3464 print_table_statistics();
3465 }
3466
3467 #endif /* PRODUCT */
3468
3469 bool AdapterHandlerLibrary::is_abstract_method_adapter(AdapterHandlerEntry* entry) {
3470 if (entry == _abstract_method_handler) {
3471 return true;
3472 }
3473 return false;
3474 }
3475
3476 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* current))
3477 assert(current == JavaThread::current(), "pre-condition");
3478 StackOverflow* overflow_state = current->stack_overflow_state();
3479 overflow_state->enable_stack_reserved_zone(/*check_if_disabled*/true);
3480 overflow_state->set_reserved_stack_activation(current->stack_base());
3481 JRT_END
3482
3483 frame SharedRuntime::look_for_reserved_stack_annotated_method(JavaThread* current, frame fr) {
3484 ResourceMark rm(current);
3485 frame activation;
3486 nmethod* nm = nullptr;
3487 int count = 1;
3488
3489 assert(fr.is_java_frame(), "Must start on Java frame");
3490
3491 RegisterMap map(JavaThread::current(),
3492 RegisterMap::UpdateMap::skip,
3493 RegisterMap::ProcessFrames::skip,
3494 RegisterMap::WalkContinuation::skip); // don't walk continuations
3495 for (; !fr.is_first_frame(); fr = fr.sender(&map)) {
3496 if (!fr.is_java_frame()) {
3497 continue;
3498 }
3499
3500 Method* method = nullptr;
3501 bool found = false;
3502 if (fr.is_interpreted_frame()) {
3503 method = fr.interpreter_frame_method();
3504 if (method != nullptr && method->has_reserved_stack_access()) {
3505 found = true;
3506 }
3507 } else {
3508 CodeBlob* cb = fr.cb();
3509 if (cb != nullptr && cb->is_nmethod()) {
3510 nm = cb->as_nmethod();
3511 method = nm->method();
3512 // scope_desc_near() must be used, instead of scope_desc_at() because on
3513 // SPARC, the pcDesc can be on the delay slot after the call instruction.
3514 for (ScopeDesc *sd = nm->scope_desc_near(fr.pc()); sd != nullptr; sd = sd->sender()) {
3515 method = sd->method();
3516 if (method != nullptr && method->has_reserved_stack_access()) {
3517 found = true;
3518 }
3519 }
3520 }
3521 }
3522 if (found) {
3523 activation = fr;
3524 warning("Potentially dangerous stack overflow in "
3525 "ReservedStackAccess annotated method %s [%d]",
3526 method->name_and_sig_as_C_string(), count++);
3527 EventReservedStackActivation event;
3528 if (event.should_commit()) {
3529 event.set_method(method);
3530 event.commit();
3531 }
3532 }
3533 }
3534 return activation;
3535 }
3536
3537 void SharedRuntime::on_slowpath_allocation_exit(JavaThread* current) {
3538 // After any safepoint, just before going back to compiled code,
3539 // we inform the GC that we will be doing initializing writes to
3540 // this object in the future without emitting card-marks, so
3541 // GC may take any compensating steps.
3542
3543 oop new_obj = current->vm_result_oop();
3544 if (new_obj == nullptr) return;
3545
3546 BarrierSet *bs = BarrierSet::barrier_set();
3547 bs->on_slowpath_allocation_exit(current, new_obj);
3548 }