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