1 /*
2 * Copyright (c) 1997, 2019, 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 "precompiled.hpp"
26 #include "jvm.h"
27 #include "aot/aotLoader.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "code/codeCache.hpp"
32 #include "code/compiledIC.hpp"
33 #include "code/icBuffer.hpp"
34 #include "code/compiledMethod.inline.hpp"
35 #include "code/scopeDesc.hpp"
36 #include "code/vtableStubs.hpp"
37 #include "compiler/abstractCompiler.hpp"
38 #include "compiler/compileBroker.hpp"
39 #include "compiler/disassembler.hpp"
40 #include "gc/shared/barrierSet.hpp"
41 #include "gc/shared/gcLocker.inline.hpp"
42 #include "interpreter/interpreter.hpp"
43 #include "interpreter/interpreterRuntime.hpp"
44 #include "jfr/jfrEvents.hpp"
45 #include "logging/log.hpp"
46 #include "memory/metaspaceShared.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "oops/klass.hpp"
50 #include "oops/method.inline.hpp"
51 #include "oops/objArrayKlass.hpp"
52 #include "oops/oop.inline.hpp"
53 #include "prims/forte.hpp"
54 #include "prims/jvmtiExport.hpp"
55 #include "prims/methodHandles.hpp"
56 #include "prims/nativeLookup.hpp"
57 #include "runtime/arguments.hpp"
58 #include "runtime/atomic.hpp"
59 #include "runtime/biasedLocking.hpp"
60 #include "runtime/compilationPolicy.hpp"
61 #include "runtime/frame.inline.hpp"
62 #include "runtime/handles.inline.hpp"
63 #include "runtime/init.hpp"
64 #include "runtime/interfaceSupport.inline.hpp"
65 #include "runtime/java.hpp"
66 #include "runtime/javaCalls.hpp"
67 #include "runtime/objectMonitor.hpp"
68 #include "runtime/sharedRuntime.hpp"
69 #include "runtime/stubRoutines.hpp"
70 #include "runtime/synchronizer.hpp"
71 #include "runtime/vframe.inline.hpp"
72 #include "runtime/vframeArray.hpp"
73 #include "utilities/copy.hpp"
74 #include "utilities/dtrace.hpp"
75 #include "utilities/events.hpp"
76 #include "utilities/hashtable.inline.hpp"
77 #include "utilities/macros.hpp"
78 #include "utilities/xmlstream.hpp"
79 #ifdef COMPILER1
80 #include "c1/c1_Runtime1.hpp"
81 #endif
82
83 // Shared stub locations
84 RuntimeStub* SharedRuntime::_wrong_method_blob;
85 RuntimeStub* SharedRuntime::_wrong_method_abstract_blob;
86 RuntimeStub* SharedRuntime::_ic_miss_blob;
87 RuntimeStub* SharedRuntime::_resolve_opt_virtual_call_blob;
88 RuntimeStub* SharedRuntime::_resolve_virtual_call_blob;
89 RuntimeStub* SharedRuntime::_resolve_static_call_blob;
90 address SharedRuntime::_resolve_static_call_entry;
91
92 DeoptimizationBlob* SharedRuntime::_deopt_blob;
93 SafepointBlob* SharedRuntime::_polling_page_vectors_safepoint_handler_blob;
94 SafepointBlob* SharedRuntime::_polling_page_safepoint_handler_blob;
95 SafepointBlob* SharedRuntime::_polling_page_return_handler_blob;
96
97 #ifdef COMPILER2
98 UncommonTrapBlob* SharedRuntime::_uncommon_trap_blob;
99 #endif // COMPILER2
100
101
102 //----------------------------generate_stubs-----------------------------------
103 void SharedRuntime::generate_stubs() {
104 _wrong_method_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method), "wrong_method_stub");
105 _wrong_method_abstract_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract), "wrong_method_abstract_stub");
106 _ic_miss_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss), "ic_miss_stub");
107 _resolve_opt_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C), "resolve_opt_virtual_call");
108 _resolve_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C), "resolve_virtual_call");
109 _resolve_static_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C), "resolve_static_call");
110 _resolve_static_call_entry = _resolve_static_call_blob->entry_point();
111
112 #if COMPILER2_OR_JVMCI
113 // Vectors are generated only by C2 and JVMCI.
114 bool support_wide = is_wide_vector(MaxVectorSize);
115 if (support_wide) {
116 _polling_page_vectors_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_VECTOR_LOOP);
117 }
118 #endif // COMPILER2_OR_JVMCI
119 _polling_page_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_LOOP);
120 _polling_page_return_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_RETURN);
121
122 generate_deopt_blob();
123
124 #ifdef COMPILER2
125 generate_uncommon_trap_blob();
126 #endif // COMPILER2
127 }
128
129 #include <math.h>
130
131 // Implementation of SharedRuntime
132
133 #ifndef PRODUCT
134 // For statistics
135 int SharedRuntime::_ic_miss_ctr = 0;
136 int SharedRuntime::_wrong_method_ctr = 0;
137 int SharedRuntime::_resolve_static_ctr = 0;
138 int SharedRuntime::_resolve_virtual_ctr = 0;
139 int SharedRuntime::_resolve_opt_virtual_ctr = 0;
140 int SharedRuntime::_implicit_null_throws = 0;
141 int SharedRuntime::_implicit_div0_throws = 0;
142 int SharedRuntime::_throw_null_ctr = 0;
143
144 int SharedRuntime::_nof_normal_calls = 0;
145 int SharedRuntime::_nof_optimized_calls = 0;
146 int SharedRuntime::_nof_inlined_calls = 0;
147 int SharedRuntime::_nof_megamorphic_calls = 0;
148 int SharedRuntime::_nof_static_calls = 0;
149 int SharedRuntime::_nof_inlined_static_calls = 0;
150 int SharedRuntime::_nof_interface_calls = 0;
151 int SharedRuntime::_nof_optimized_interface_calls = 0;
152 int SharedRuntime::_nof_inlined_interface_calls = 0;
153 int SharedRuntime::_nof_megamorphic_interface_calls = 0;
154 int SharedRuntime::_nof_removable_exceptions = 0;
155
156 int SharedRuntime::_new_instance_ctr=0;
157 int SharedRuntime::_new_array_ctr=0;
158 int SharedRuntime::_multi1_ctr=0;
159 int SharedRuntime::_multi2_ctr=0;
160 int SharedRuntime::_multi3_ctr=0;
161 int SharedRuntime::_multi4_ctr=0;
162 int SharedRuntime::_multi5_ctr=0;
163 int SharedRuntime::_mon_enter_stub_ctr=0;
164 int SharedRuntime::_mon_exit_stub_ctr=0;
165 int SharedRuntime::_mon_enter_ctr=0;
166 int SharedRuntime::_mon_exit_ctr=0;
167 int SharedRuntime::_partial_subtype_ctr=0;
168 int SharedRuntime::_jbyte_array_copy_ctr=0;
169 int SharedRuntime::_jshort_array_copy_ctr=0;
170 int SharedRuntime::_jint_array_copy_ctr=0;
171 int SharedRuntime::_jlong_array_copy_ctr=0;
172 int SharedRuntime::_oop_array_copy_ctr=0;
173 int SharedRuntime::_checkcast_array_copy_ctr=0;
174 int SharedRuntime::_unsafe_array_copy_ctr=0;
175 int SharedRuntime::_generic_array_copy_ctr=0;
176 int SharedRuntime::_slow_array_copy_ctr=0;
177 int SharedRuntime::_find_handler_ctr=0;
178 int SharedRuntime::_rethrow_ctr=0;
179
180 int SharedRuntime::_ICmiss_index = 0;
181 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count];
182 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count];
183
184
185 void SharedRuntime::trace_ic_miss(address at) {
186 for (int i = 0; i < _ICmiss_index; i++) {
187 if (_ICmiss_at[i] == at) {
188 _ICmiss_count[i]++;
189 return;
190 }
191 }
192 int index = _ICmiss_index++;
193 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1;
194 _ICmiss_at[index] = at;
195 _ICmiss_count[index] = 1;
196 }
197
198 void SharedRuntime::print_ic_miss_histogram() {
199 if (ICMissHistogram) {
200 tty->print_cr("IC Miss Histogram:");
201 int tot_misses = 0;
202 for (int i = 0; i < _ICmiss_index; i++) {
203 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", p2i(_ICmiss_at[i]), _ICmiss_count[i]);
204 tot_misses += _ICmiss_count[i];
205 }
206 tty->print_cr("Total IC misses: %7d", tot_misses);
207 }
208 }
209 #endif // PRODUCT
210
211
212 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x))
213 return x * y;
214 JRT_END
215
216
217 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x))
218 if (x == min_jlong && y == CONST64(-1)) {
219 return x;
220 } else {
221 return x / y;
222 }
223 JRT_END
224
225
226 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x))
227 if (x == min_jlong && y == CONST64(-1)) {
228 return 0;
229 } else {
230 return x % y;
231 }
232 JRT_END
233
234
235 const juint float_sign_mask = 0x7FFFFFFF;
236 const juint float_infinity = 0x7F800000;
237 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF);
238 const julong double_infinity = CONST64(0x7FF0000000000000);
239
240 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y))
241 #ifdef _WIN64
242 // 64-bit Windows on amd64 returns the wrong values for
243 // infinity operands.
244 union { jfloat f; juint i; } xbits, ybits;
245 xbits.f = x;
246 ybits.f = y;
247 // x Mod Infinity == x unless x is infinity
248 if (((xbits.i & float_sign_mask) != float_infinity) &&
249 ((ybits.i & float_sign_mask) == float_infinity) ) {
250 return x;
251 }
252 return ((jfloat)fmod_winx64((double)x, (double)y));
253 #else
254 return ((jfloat)fmod((double)x,(double)y));
255 #endif
256 JRT_END
257
258
259 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y))
260 #ifdef _WIN64
261 union { jdouble d; julong l; } xbits, ybits;
262 xbits.d = x;
263 ybits.d = y;
264 // x Mod Infinity == x unless x is infinity
265 if (((xbits.l & double_sign_mask) != double_infinity) &&
266 ((ybits.l & double_sign_mask) == double_infinity) ) {
267 return x;
268 }
269 return ((jdouble)fmod_winx64((double)x, (double)y));
270 #else
271 return ((jdouble)fmod((double)x,(double)y));
272 #endif
273 JRT_END
274
275 #ifdef __SOFTFP__
276 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y))
277 return x + y;
278 JRT_END
279
280 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y))
281 return x - y;
282 JRT_END
283
284 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y))
285 return x * y;
286 JRT_END
287
288 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y))
289 return x / y;
290 JRT_END
291
292 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y))
293 return x + y;
294 JRT_END
295
296 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y))
297 return x - y;
298 JRT_END
299
300 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y))
301 return x * y;
302 JRT_END
303
304 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y))
305 return x / y;
306 JRT_END
307
308 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x))
309 return (jfloat)x;
310 JRT_END
311
312 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x))
313 return (jdouble)x;
314 JRT_END
315
316 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x))
317 return (jdouble)x;
318 JRT_END
319
320 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y))
321 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/
322 JRT_END
323
324 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y))
325 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
326 JRT_END
327
328 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y))
329 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */
330 JRT_END
331
332 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y))
333 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
334 JRT_END
335
336 // Functions to return the opposite of the aeabi functions for nan.
337 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(float x, float y))
338 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
339 JRT_END
340
341 JRT_LEAF(int, SharedRuntime::unordered_dcmplt(double x, double y))
342 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
343 JRT_END
344
345 JRT_LEAF(int, SharedRuntime::unordered_fcmple(float x, float y))
346 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
347 JRT_END
348
349 JRT_LEAF(int, SharedRuntime::unordered_dcmple(double x, double y))
350 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
351 JRT_END
352
353 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y))
354 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
355 JRT_END
356
357 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y))
358 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
359 JRT_END
360
361 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y))
362 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
363 JRT_END
364
365 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y))
366 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
367 JRT_END
368
369 // Intrinsics make gcc generate code for these.
370 float SharedRuntime::fneg(float f) {
371 return -f;
372 }
373
374 double SharedRuntime::dneg(double f) {
375 return -f;
376 }
377
378 #endif // __SOFTFP__
379
380 #if defined(__SOFTFP__) || defined(E500V2)
381 // Intrinsics make gcc generate code for these.
382 double SharedRuntime::dabs(double f) {
383 return (f <= (double)0.0) ? (double)0.0 - f : f;
384 }
385
386 #endif
387
388 #if defined(__SOFTFP__) || defined(PPC)
389 double SharedRuntime::dsqrt(double f) {
390 return sqrt(f);
391 }
392 #endif
393
394 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x))
395 if (g_isnan(x))
396 return 0;
397 if (x >= (jfloat) max_jint)
398 return max_jint;
399 if (x <= (jfloat) min_jint)
400 return min_jint;
401 return (jint) x;
402 JRT_END
403
404
405 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x))
406 if (g_isnan(x))
407 return 0;
408 if (x >= (jfloat) max_jlong)
409 return max_jlong;
410 if (x <= (jfloat) min_jlong)
411 return min_jlong;
412 return (jlong) x;
413 JRT_END
414
415
416 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x))
417 if (g_isnan(x))
418 return 0;
419 if (x >= (jdouble) max_jint)
420 return max_jint;
421 if (x <= (jdouble) min_jint)
422 return min_jint;
423 return (jint) x;
424 JRT_END
425
426
427 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x))
428 if (g_isnan(x))
429 return 0;
430 if (x >= (jdouble) max_jlong)
431 return max_jlong;
432 if (x <= (jdouble) min_jlong)
433 return min_jlong;
434 return (jlong) x;
435 JRT_END
436
437
438 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x))
439 return (jfloat)x;
440 JRT_END
441
442
443 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x))
444 return (jfloat)x;
445 JRT_END
446
447
448 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x))
449 return (jdouble)x;
450 JRT_END
451
452 // Exception handling across interpreter/compiler boundaries
453 //
454 // exception_handler_for_return_address(...) returns the continuation address.
455 // The continuation address is the entry point of the exception handler of the
456 // previous frame depending on the return address.
457
458 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* thread, address return_address) {
459 assert(frame::verify_return_pc(return_address), "must be a return address: " INTPTR_FORMAT, p2i(return_address));
460 assert(thread->frames_to_pop_failed_realloc() == 0 || Interpreter::contains(return_address), "missed frames to pop?");
461
462 // Reset method handle flag.
463 thread->set_is_method_handle_return(false);
464
465 #if INCLUDE_JVMCI
466 // JVMCI's ExceptionHandlerStub expects the thread local exception PC to be clear
467 // and other exception handler continuations do not read it
468 thread->set_exception_pc(NULL);
469 #endif // INCLUDE_JVMCI
470
471 // The fastest case first
472 CodeBlob* blob = CodeCache::find_blob(return_address);
473 CompiledMethod* nm = (blob != NULL) ? blob->as_compiled_method_or_null() : NULL;
474 if (nm != NULL) {
475 // Set flag if return address is a method handle call site.
476 thread->set_is_method_handle_return(nm->is_method_handle_return(return_address));
477 // native nmethods don't have exception handlers
478 assert(!nm->is_native_method(), "no exception handler");
479 assert(nm->header_begin() != nm->exception_begin(), "no exception handler");
480 if (nm->is_deopt_pc(return_address)) {
481 // If we come here because of a stack overflow, the stack may be
482 // unguarded. Reguard the stack otherwise if we return to the
483 // deopt blob and the stack bang causes a stack overflow we
484 // crash.
485 bool guard_pages_enabled = thread->stack_guards_enabled();
486 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack();
487 if (thread->reserved_stack_activation() != thread->stack_base()) {
488 thread->set_reserved_stack_activation(thread->stack_base());
489 }
490 assert(guard_pages_enabled, "stack banging in deopt blob may cause crash");
491 return SharedRuntime::deopt_blob()->unpack_with_exception();
492 } else {
493 return nm->exception_begin();
494 }
495 }
496
497 // Entry code
498 if (StubRoutines::returns_to_call_stub(return_address)) {
499 return StubRoutines::catch_exception_entry();
500 }
501 // Interpreted code
502 if (Interpreter::contains(return_address)) {
503 return Interpreter::rethrow_exception_entry();
504 }
505
506 guarantee(blob == NULL || !blob->is_runtime_stub(), "caller should have skipped stub");
507 guarantee(!VtableStubs::contains(return_address), "NULL exceptions in vtables should have been handled already!");
508
509 #ifndef PRODUCT
510 { ResourceMark rm;
511 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", p2i(return_address));
512 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here");
513 tty->print_cr("b) other problem");
514 }
515 #endif // PRODUCT
516
517 ShouldNotReachHere();
518 return NULL;
519 }
520
521
522 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* thread, address return_address))
523 return raw_exception_handler_for_return_address(thread, return_address);
524 JRT_END
525
526
527 address SharedRuntime::get_poll_stub(address pc) {
528 address stub;
529 // Look up the code blob
530 CodeBlob *cb = CodeCache::find_blob(pc);
531
532 // Should be an nmethod
533 guarantee(cb != NULL && cb->is_compiled(), "safepoint polling: pc must refer to an nmethod");
534
535 // Look up the relocation information
536 assert(((CompiledMethod*)cb)->is_at_poll_or_poll_return(pc),
537 "safepoint polling: type must be poll");
538
539 #ifdef ASSERT
540 if (!((NativeInstruction*)pc)->is_safepoint_poll()) {
541 tty->print_cr("bad pc: " PTR_FORMAT, p2i(pc));
542 Disassembler::decode(cb);
543 fatal("Only polling locations are used for safepoint");
544 }
545 #endif
546
547 bool at_poll_return = ((CompiledMethod*)cb)->is_at_poll_return(pc);
548 bool has_wide_vectors = ((CompiledMethod*)cb)->has_wide_vectors();
549 if (at_poll_return) {
550 assert(SharedRuntime::polling_page_return_handler_blob() != NULL,
551 "polling page return stub not created yet");
552 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();
553 } else if (has_wide_vectors) {
554 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != NULL,
555 "polling page vectors safepoint stub not created yet");
556 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point();
557 } else {
558 assert(SharedRuntime::polling_page_safepoint_handler_blob() != NULL,
559 "polling page safepoint stub not created yet");
560 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point();
561 }
562 log_debug(safepoint)("... found polling page %s exception at pc = "
563 INTPTR_FORMAT ", stub =" INTPTR_FORMAT,
564 at_poll_return ? "return" : "loop",
565 (intptr_t)pc, (intptr_t)stub);
566 return stub;
567 }
568
569
570 oop SharedRuntime::retrieve_receiver( Symbol* sig, frame caller ) {
571 assert(caller.is_interpreted_frame(), "");
572 int args_size = ArgumentSizeComputer(sig).size() + 1;
573 assert(args_size <= caller.interpreter_frame_expression_stack_size(), "receiver must be on interpreter stack");
574 oop result = cast_to_oop(*caller.interpreter_frame_tos_at(args_size - 1));
575 assert(Universe::heap()->is_in(result) && oopDesc::is_oop(result), "receiver must be an oop");
576 return result;
577 }
578
579
580 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception) {
581 if (JvmtiExport::can_post_on_exceptions()) {
582 vframeStream vfst(thread, true);
583 methodHandle method = methodHandle(thread, vfst.method());
584 address bcp = method()->bcp_from(vfst.bci());
585 JvmtiExport::post_exception_throw(thread, method(), bcp, h_exception());
586 }
587 Exceptions::_throw(thread, __FILE__, __LINE__, h_exception);
588 }
589
590 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message) {
591 Handle h_exception = Exceptions::new_exception(thread, name, message);
592 throw_and_post_jvmti_exception(thread, h_exception);
593 }
594
595 // The interpreter code to call this tracing function is only
596 // called/generated when UL is on for redefine, class and has the right level
597 // and tags. Since obsolete methods are never compiled, we don't have
598 // to modify the compilers to generate calls to this function.
599 //
600 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry(
601 JavaThread* thread, Method* method))
602 if (method->is_obsolete()) {
603 // We are calling an obsolete method, but this is not necessarily
604 // an error. Our method could have been redefined just after we
605 // fetched the Method* from the constant pool.
606 ResourceMark rm;
607 log_trace(redefine, class, obsolete)("calling obsolete method '%s'", method->name_and_sig_as_C_string());
608 }
609 return 0;
610 JRT_END
611
612 // ret_pc points into caller; we are returning caller's exception handler
613 // for given exception
614 address SharedRuntime::compute_compiled_exc_handler(CompiledMethod* cm, address ret_pc, Handle& exception,
615 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred) {
616 assert(cm != NULL, "must exist");
617 ResourceMark rm;
618
619 #if INCLUDE_JVMCI
620 if (cm->is_compiled_by_jvmci()) {
621 // lookup exception handler for this pc
622 int catch_pco = ret_pc - cm->code_begin();
623 ExceptionHandlerTable table(cm);
624 HandlerTableEntry *t = table.entry_for(catch_pco, -1, 0);
625 if (t != NULL) {
626 return cm->code_begin() + t->pco();
627 } else {
628 return Deoptimization::deoptimize_for_missing_exception_handler(cm);
629 }
630 }
631 #endif // INCLUDE_JVMCI
632
633 nmethod* nm = cm->as_nmethod();
634 ScopeDesc* sd = nm->scope_desc_at(ret_pc);
635 // determine handler bci, if any
636 EXCEPTION_MARK;
637
638 int handler_bci = -1;
639 int scope_depth = 0;
640 if (!force_unwind) {
641 int bci = sd->bci();
642 bool recursive_exception = false;
643 do {
644 bool skip_scope_increment = false;
645 // exception handler lookup
646 Klass* ek = exception->klass();
647 methodHandle mh(THREAD, sd->method());
648 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD);
649 if (HAS_PENDING_EXCEPTION) {
650 recursive_exception = true;
651 // We threw an exception while trying to find the exception handler.
652 // Transfer the new exception to the exception handle which will
653 // be set into thread local storage, and do another lookup for an
654 // exception handler for this exception, this time starting at the
655 // BCI of the exception handler which caused the exception to be
656 // thrown (bugs 4307310 and 4546590). Set "exception" reference
657 // argument to ensure that the correct exception is thrown (4870175).
658 recursive_exception_occurred = true;
659 exception = Handle(THREAD, PENDING_EXCEPTION);
660 CLEAR_PENDING_EXCEPTION;
661 if (handler_bci >= 0) {
662 bci = handler_bci;
663 handler_bci = -1;
664 skip_scope_increment = true;
665 }
666 }
667 else {
668 recursive_exception = false;
669 }
670 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) {
671 sd = sd->sender();
672 if (sd != NULL) {
673 bci = sd->bci();
674 }
675 ++scope_depth;
676 }
677 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != NULL));
678 }
679
680 // found handling method => lookup exception handler
681 int catch_pco = ret_pc - nm->code_begin();
682
683 ExceptionHandlerTable table(nm);
684 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth);
685 if (t == NULL && (nm->is_compiled_by_c1() || handler_bci != -1)) {
686 // Allow abbreviated catch tables. The idea is to allow a method
687 // to materialize its exceptions without committing to the exact
688 // routing of exceptions. In particular this is needed for adding
689 // a synthetic handler to unlock monitors when inlining
690 // synchronized methods since the unlock path isn't represented in
691 // the bytecodes.
692 t = table.entry_for(catch_pco, -1, 0);
693 }
694
695 #ifdef COMPILER1
696 if (t == NULL && nm->is_compiled_by_c1()) {
697 assert(nm->unwind_handler_begin() != NULL, "");
698 return nm->unwind_handler_begin();
699 }
700 #endif
701
702 if (t == NULL) {
703 ttyLocker ttyl;
704 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d", p2i(ret_pc), handler_bci);
705 tty->print_cr(" Exception:");
706 exception->print();
707 tty->cr();
708 tty->print_cr(" Compiled exception table :");
709 table.print();
710 nm->print_code();
711 guarantee(false, "missing exception handler");
712 return NULL;
713 }
714
715 return nm->code_begin() + t->pco();
716 }
717
718 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* thread))
719 // These errors occur only at call sites
720 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError());
721 JRT_END
722
723 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
724 // These errors occur only at call sites
725 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub");
726 JRT_END
727
728 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread))
729 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
730 JRT_END
731
732 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* thread))
733 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
734 JRT_END
735
736 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* thread))
737 // This entry point is effectively only used for NullPointerExceptions which occur at inline
738 // cache sites (when the callee activation is not yet set up) so we are at a call site
739 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
740 JRT_END
741
742 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread))
743 throw_StackOverflowError_common(thread, false);
744 JRT_END
745
746 JRT_ENTRY(void, SharedRuntime::throw_delayed_StackOverflowError(JavaThread* thread))
747 throw_StackOverflowError_common(thread, true);
748 JRT_END
749
750 void SharedRuntime::throw_StackOverflowError_common(JavaThread* thread, bool delayed) {
751 // We avoid using the normal exception construction in this case because
752 // it performs an upcall to Java, and we're already out of stack space.
753 Thread* THREAD = thread;
754 Klass* k = SystemDictionary::StackOverflowError_klass();
755 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK);
756 if (delayed) {
757 java_lang_Throwable::set_message(exception_oop,
758 Universe::delayed_stack_overflow_error_message());
759 }
760 Handle exception (thread, exception_oop);
761 if (StackTraceInThrowable) {
762 java_lang_Throwable::fill_in_stack_trace(exception);
763 }
764 // Increment counter for hs_err file reporting
765 Atomic::inc(&Exceptions::_stack_overflow_errors);
766 throw_and_post_jvmti_exception(thread, exception);
767 }
768
769 address SharedRuntime::continuation_for_implicit_exception(JavaThread* thread,
770 address pc,
771 ImplicitExceptionKind exception_kind)
772 {
773 address target_pc = NULL;
774
775 if (Interpreter::contains(pc)) {
776 #ifdef CC_INTERP
777 // C++ interpreter doesn't throw implicit exceptions
778 ShouldNotReachHere();
779 #else
780 switch (exception_kind) {
781 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry();
782 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry();
783 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry();
784 default: ShouldNotReachHere();
785 }
786 #endif // !CC_INTERP
787 } else {
788 switch (exception_kind) {
789 case STACK_OVERFLOW: {
790 // Stack overflow only occurs upon frame setup; the callee is
791 // going to be unwound. Dispatch to a shared runtime stub
792 // which will cause the StackOverflowError to be fabricated
793 // and processed.
794 // Stack overflow should never occur during deoptimization:
795 // the compiled method bangs the stack by as much as the
796 // interpreter would need in case of a deoptimization. The
797 // deoptimization blob and uncommon trap blob bang the stack
798 // in a debug VM to verify the correctness of the compiled
799 // method stack banging.
800 assert(thread->deopt_mark() == NULL, "no stack overflow from deopt blob/uncommon trap");
801 Events::log_exception(thread, "StackOverflowError at " INTPTR_FORMAT, p2i(pc));
802 return StubRoutines::throw_StackOverflowError_entry();
803 }
804
805 case IMPLICIT_NULL: {
806 if (VtableStubs::contains(pc)) {
807 // We haven't yet entered the callee frame. Fabricate an
808 // exception and begin dispatching it in the caller. Since
809 // the caller was at a call site, it's safe to destroy all
810 // caller-saved registers, as these entry points do.
811 VtableStub* vt_stub = VtableStubs::stub_containing(pc);
812
813 // If vt_stub is NULL, then return NULL to signal handler to report the SEGV error.
814 if (vt_stub == NULL) return NULL;
815
816 if (vt_stub->is_abstract_method_error(pc)) {
817 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs");
818 Events::log_exception(thread, "AbstractMethodError at " INTPTR_FORMAT, p2i(pc));
819 // Instead of throwing the abstract method error here directly, we re-resolve
820 // and will throw the AbstractMethodError during resolve. As a result, we'll
821 // get a more detailed error message.
822 return SharedRuntime::get_handle_wrong_method_stub();
823 } else {
824 Events::log_exception(thread, "NullPointerException at vtable entry " INTPTR_FORMAT, p2i(pc));
825 // Assert that the signal comes from the expected location in stub code.
826 assert(vt_stub->is_null_pointer_exception(pc),
827 "obtained signal from unexpected location in stub code");
828 return StubRoutines::throw_NullPointerException_at_call_entry();
829 }
830 } else {
831 CodeBlob* cb = CodeCache::find_blob(pc);
832
833 // If code blob is NULL, then return NULL to signal handler to report the SEGV error.
834 if (cb == NULL) return NULL;
835
836 // Exception happened in CodeCache. Must be either:
837 // 1. Inline-cache check in C2I handler blob,
838 // 2. Inline-cache check in nmethod, or
839 // 3. Implicit null exception in nmethod
840
841 if (!cb->is_compiled()) {
842 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob();
843 if (!is_in_blob) {
844 // Allow normal crash reporting to handle this
845 return NULL;
846 }
847 Events::log_exception(thread, "NullPointerException in code blob at " INTPTR_FORMAT, p2i(pc));
848 // There is no handler here, so we will simply unwind.
849 return StubRoutines::throw_NullPointerException_at_call_entry();
850 }
851
852 // Otherwise, it's a compiled method. Consult its exception handlers.
853 CompiledMethod* cm = (CompiledMethod*)cb;
854 if (cm->inlinecache_check_contains(pc)) {
855 // exception happened inside inline-cache check code
856 // => the nmethod is not yet active (i.e., the frame
857 // is not set up yet) => use return address pushed by
858 // caller => don't push another return address
859 Events::log_exception(thread, "NullPointerException in IC check " INTPTR_FORMAT, p2i(pc));
860 return StubRoutines::throw_NullPointerException_at_call_entry();
861 }
862
863 if (cm->method()->is_method_handle_intrinsic()) {
864 // exception happened inside MH dispatch code, similar to a vtable stub
865 Events::log_exception(thread, "NullPointerException in MH adapter " INTPTR_FORMAT, p2i(pc));
866 return StubRoutines::throw_NullPointerException_at_call_entry();
867 }
868
869 #ifndef PRODUCT
870 _implicit_null_throws++;
871 #endif
872 target_pc = cm->continuation_for_implicit_null_exception(pc);
873 // If there's an unexpected fault, target_pc might be NULL,
874 // in which case we want to fall through into the normal
875 // error handling code.
876 }
877
878 break; // fall through
879 }
880
881
882 case IMPLICIT_DIVIDE_BY_ZERO: {
883 CompiledMethod* cm = CodeCache::find_compiled(pc);
884 guarantee(cm != NULL, "must have containing compiled method for implicit division-by-zero exceptions");
885 #ifndef PRODUCT
886 _implicit_div0_throws++;
887 #endif
888 target_pc = cm->continuation_for_implicit_div0_exception(pc);
889 // If there's an unexpected fault, target_pc might be NULL,
890 // in which case we want to fall through into the normal
891 // error handling code.
892 break; // fall through
893 }
894
895 default: ShouldNotReachHere();
896 }
897
898 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind");
899
900 if (exception_kind == IMPLICIT_NULL) {
901 #ifndef PRODUCT
902 // for AbortVMOnException flag
903 Exceptions::debug_check_abort("java.lang.NullPointerException");
904 #endif //PRODUCT
905 Events::log_exception(thread, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
906 } else {
907 #ifndef PRODUCT
908 // for AbortVMOnException flag
909 Exceptions::debug_check_abort("java.lang.ArithmeticException");
910 #endif //PRODUCT
911 Events::log_exception(thread, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
912 }
913 return target_pc;
914 }
915
916 ShouldNotReachHere();
917 return NULL;
918 }
919
920
921 /**
922 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is
923 * installed in the native function entry of all native Java methods before
924 * they get linked to their actual native methods.
925 *
926 * \note
927 * This method actually never gets called! The reason is because
928 * the interpreter's native entries call NativeLookup::lookup() which
929 * throws the exception when the lookup fails. The exception is then
930 * caught and forwarded on the return from NativeLookup::lookup() call
931 * before the call to the native function. This might change in the future.
932 */
933 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...))
934 {
935 // We return a bad value here to make sure that the exception is
936 // forwarded before we look at the return value.
937 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badAddress);
938 }
939 JNI_END
940
941 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
942 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
943 }
944
945 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
946 #if INCLUDE_JVMCI
947 if (!obj->klass()->has_finalizer()) {
948 return;
949 }
950 #endif // INCLUDE_JVMCI
951 assert(oopDesc::is_oop(obj), "must be a valid oop");
952 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
953 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
954 JRT_END
955
956
957 jlong SharedRuntime::get_java_tid(Thread* thread) {
958 if (thread != NULL) {
959 if (thread->is_Java_thread()) {
960 oop obj = ((JavaThread*)thread)->threadObj();
961 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj);
962 }
963 }
964 return 0;
965 }
966
967 /**
968 * This function ought to be a void function, but cannot be because
969 * it gets turned into a tail-call on sparc, which runs into dtrace bug
970 * 6254741. Once that is fixed we can remove the dummy return value.
971 */
972 int SharedRuntime::dtrace_object_alloc(oopDesc* o, int size) {
973 return dtrace_object_alloc_base(Thread::current(), o, size);
974 }
975
976 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size) {
977 assert(DTraceAllocProbes, "wrong call");
978 Klass* klass = o->klass();
979 Symbol* name = klass->name();
980 HOTSPOT_OBJECT_ALLOC(
981 get_java_tid(thread),
982 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize);
983 return 0;
984 }
985
986 JRT_LEAF(int, SharedRuntime::dtrace_method_entry(
987 JavaThread* thread, Method* method))
988 assert(DTraceMethodProbes, "wrong call");
989 Symbol* kname = method->klass_name();
990 Symbol* name = method->name();
991 Symbol* sig = method->signature();
992 HOTSPOT_METHOD_ENTRY(
993 get_java_tid(thread),
994 (char *) kname->bytes(), kname->utf8_length(),
995 (char *) name->bytes(), name->utf8_length(),
996 (char *) sig->bytes(), sig->utf8_length());
997 return 0;
998 JRT_END
999
1000 JRT_LEAF(int, SharedRuntime::dtrace_method_exit(
1001 JavaThread* thread, Method* method))
1002 assert(DTraceMethodProbes, "wrong call");
1003 Symbol* kname = method->klass_name();
1004 Symbol* name = method->name();
1005 Symbol* sig = method->signature();
1006 HOTSPOT_METHOD_RETURN(
1007 get_java_tid(thread),
1008 (char *) kname->bytes(), kname->utf8_length(),
1009 (char *) name->bytes(), name->utf8_length(),
1010 (char *) sig->bytes(), sig->utf8_length());
1011 return 0;
1012 JRT_END
1013
1014
1015 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode)
1016 // for a call current in progress, i.e., arguments has been pushed on stack
1017 // put callee has not been invoked yet. Used by: resolve virtual/static,
1018 // vtable updates, etc. Caller frame must be compiled.
1019 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) {
1020 ResourceMark rm(THREAD);
1021
1022 // last java frame on stack (which includes native call frames)
1023 vframeStream vfst(thread, true); // Do not skip and javaCalls
1024
1025 return find_callee_info_helper(thread, vfst, bc, callinfo, THREAD);
1026 }
1027
1028 methodHandle SharedRuntime::extract_attached_method(vframeStream& vfst) {
1029 CompiledMethod* caller = vfst.nm();
1030
1031 nmethodLocker caller_lock(caller);
1032
1033 address pc = vfst.frame_pc();
1034 { // Get call instruction under lock because another thread may be busy patching it.
1035 CompiledICLocker ic_locker(caller);
1036 return caller->attached_method_before_pc(pc);
1037 }
1038 return NULL;
1039 }
1040
1041 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
1042 // for a call current in progress, i.e., arguments has been pushed on stack
1043 // but callee has not been invoked yet. Caller frame must be compiled.
1044 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread,
1045 vframeStream& vfst,
1046 Bytecodes::Code& bc,
1047 CallInfo& callinfo, TRAPS) {
1048 Handle receiver;
1049 Handle nullHandle; //create a handy null handle for exception returns
1050
1051 assert(!vfst.at_end(), "Java frame must exist");
1052
1053 // Find caller and bci from vframe
1054 methodHandle caller(THREAD, vfst.method());
1055 int bci = vfst.bci();
1056
1057 Bytecode_invoke bytecode(caller, bci);
1058 int bytecode_index = bytecode.index();
1059 bc = bytecode.invoke_code();
1060
1061 methodHandle attached_method = extract_attached_method(vfst);
1062 if (attached_method.not_null()) {
1063 methodHandle callee = bytecode.static_target(CHECK_NH);
1064 vmIntrinsics::ID id = callee->intrinsic_id();
1065 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call,
1066 // it attaches statically resolved method to the call site.
1067 if (MethodHandles::is_signature_polymorphic(id) &&
1068 MethodHandles::is_signature_polymorphic_intrinsic(id)) {
1069 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id);
1070
1071 // Adjust invocation mode according to the attached method.
1072 switch (bc) {
1073 case Bytecodes::_invokevirtual:
1074 if (attached_method->method_holder()->is_interface()) {
1075 bc = Bytecodes::_invokeinterface;
1076 }
1077 break;
1078 case Bytecodes::_invokeinterface:
1079 if (!attached_method->method_holder()->is_interface()) {
1080 bc = Bytecodes::_invokevirtual;
1081 }
1082 break;
1083 case Bytecodes::_invokehandle:
1084 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) {
1085 bc = attached_method->is_static() ? Bytecodes::_invokestatic
1086 : Bytecodes::_invokevirtual;
1087 }
1088 break;
1089 default:
1090 break;
1091 }
1092 }
1093 }
1094
1095 assert(bc != Bytecodes::_illegal, "not initialized");
1096
1097 bool has_receiver = bc != Bytecodes::_invokestatic &&
1098 bc != Bytecodes::_invokedynamic &&
1099 bc != Bytecodes::_invokehandle;
1100
1101 // Find receiver for non-static call
1102 if (has_receiver) {
1103 // This register map must be update since we need to find the receiver for
1104 // compiled frames. The receiver might be in a register.
1105 RegisterMap reg_map2(thread);
1106 frame stubFrame = thread->last_frame();
1107 // Caller-frame is a compiled frame
1108 frame callerFrame = stubFrame.sender(®_map2);
1109
1110 if (attached_method.is_null()) {
1111 methodHandle callee = bytecode.static_target(CHECK_NH);
1112 if (callee.is_null()) {
1113 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1114 }
1115 }
1116
1117 // Retrieve from a compiled argument list
1118 receiver = Handle(THREAD, callerFrame.retrieve_receiver(®_map2));
1119
1120 if (receiver.is_null()) {
1121 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1122 }
1123 }
1124
1125 // Resolve method
1126 if (attached_method.not_null()) {
1127 // Parameterized by attached method.
1128 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, CHECK_NH);
1129 } else {
1130 // Parameterized by bytecode.
1131 constantPoolHandle constants(THREAD, caller->constants());
1132 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH);
1133 }
1134
1135 #ifdef ASSERT
1136 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1137 if (has_receiver) {
1138 assert(receiver.not_null(), "should have thrown exception");
1139 Klass* receiver_klass = receiver->klass();
1140 Klass* rk = NULL;
1141 if (attached_method.not_null()) {
1142 // In case there's resolved method attached, use its holder during the check.
1143 rk = attached_method->method_holder();
1144 } else {
1145 // Klass is already loaded.
1146 constantPoolHandle constants(THREAD, caller->constants());
1147 rk = constants->klass_ref_at(bytecode_index, CHECK_NH);
1148 }
1149 Klass* static_receiver_klass = rk;
1150 methodHandle callee = callinfo.selected_method();
1151 assert(receiver_klass->is_subtype_of(static_receiver_klass),
1152 "actual receiver must be subclass of static receiver klass");
1153 if (receiver_klass->is_instance_klass()) {
1154 if (InstanceKlass::cast(receiver_klass)->is_not_initialized()) {
1155 tty->print_cr("ERROR: Klass not yet initialized!!");
1156 receiver_klass->print();
1157 }
1158 assert(!InstanceKlass::cast(receiver_klass)->is_not_initialized(), "receiver_klass must be initialized");
1159 }
1160 }
1161 #endif
1162
1163 return receiver;
1164 }
1165
1166 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) {
1167 ResourceMark rm(THREAD);
1168 // We need first to check if any Java activations (compiled, interpreted)
1169 // exist on the stack since last JavaCall. If not, we need
1170 // to get the target method from the JavaCall wrapper.
1171 vframeStream vfst(thread, true); // Do not skip any javaCalls
1172 methodHandle callee_method;
1173 if (vfst.at_end()) {
1174 // No Java frames were found on stack since we did the JavaCall.
1175 // Hence the stack can only contain an entry_frame. We need to
1176 // find the target method from the stub frame.
1177 RegisterMap reg_map(thread, false);
1178 frame fr = thread->last_frame();
1179 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1180 fr = fr.sender(®_map);
1181 assert(fr.is_entry_frame(), "must be");
1182 // fr is now pointing to the entry frame.
1183 callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method());
1184 } else {
1185 Bytecodes::Code bc;
1186 CallInfo callinfo;
1187 find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle()));
1188 callee_method = callinfo.selected_method();
1189 }
1190 assert(callee_method()->is_method(), "must be");
1191 return callee_method;
1192 }
1193
1194 // Resolves a call.
1195 methodHandle SharedRuntime::resolve_helper(JavaThread *thread,
1196 bool is_virtual,
1197 bool is_optimized, TRAPS) {
1198 methodHandle callee_method;
1199 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1200 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
1201 int retry_count = 0;
1202 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() &&
1203 callee_method->method_holder() != SystemDictionary::Object_klass()) {
1204 // If has a pending exception then there is no need to re-try to
1205 // resolve this method.
1206 // If the method has been redefined, we need to try again.
1207 // Hack: we have no way to update the vtables of arrays, so don't
1208 // require that java.lang.Object has been updated.
1209
1210 // It is very unlikely that method is redefined more than 100 times
1211 // in the middle of resolve. If it is looping here more than 100 times
1212 // means then there could be a bug here.
1213 guarantee((retry_count++ < 100),
1214 "Could not resolve to latest version of redefined method");
1215 // method is redefined in the middle of resolve so re-try.
1216 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1217 }
1218 }
1219 return callee_method;
1220 }
1221
1222 // This fails if resolution required refilling of IC stubs
1223 bool SharedRuntime::resolve_sub_helper_internal(methodHandle callee_method, const frame& caller_frame,
1224 CompiledMethod* caller_nm, bool is_virtual, bool is_optimized,
1225 Handle receiver, CallInfo& call_info, Bytecodes::Code invoke_code, TRAPS) {
1226 StaticCallInfo static_call_info;
1227 CompiledICInfo virtual_call_info;
1228
1229 // Make sure the callee nmethod does not get deoptimized and removed before
1230 // we are done patching the code.
1231 CompiledMethod* callee = callee_method->code();
1232
1233 if (callee != NULL) {
1234 assert(callee->is_compiled(), "must be nmethod for patching");
1235 }
1236
1237 if (callee != NULL && !callee->is_in_use()) {
1238 // Patch call site to C2I adapter if callee nmethod is deoptimized or unloaded.
1239 callee = NULL;
1240 }
1241 nmethodLocker nl_callee(callee);
1242 #ifdef ASSERT
1243 address dest_entry_point = callee == NULL ? 0 : callee->entry_point(); // used below
1244 #endif
1245
1246 bool is_nmethod = caller_nm->is_nmethod();
1247
1248 if (is_virtual) {
1249 assert(receiver.not_null() || invoke_code == Bytecodes::_invokehandle, "sanity check");
1250 bool static_bound = call_info.resolved_method()->can_be_statically_bound();
1251 Klass* klass = invoke_code == Bytecodes::_invokehandle ? NULL : receiver->klass();
1252 CompiledIC::compute_monomorphic_entry(callee_method, klass,
1253 is_optimized, static_bound, is_nmethod, virtual_call_info,
1254 CHECK_false);
1255 } else {
1256 // static call
1257 CompiledStaticCall::compute_entry(callee_method, is_nmethod, static_call_info);
1258 }
1259
1260 // grab lock, check for deoptimization and potentially patch caller
1261 {
1262 CompiledICLocker ml(caller_nm);
1263
1264 // Lock blocks for safepoint during which both nmethods can change state.
1265
1266 // Now that we are ready to patch if the Method* was redefined then
1267 // don't update call site and let the caller retry.
1268 // Don't update call site if callee nmethod was unloaded or deoptimized.
1269 // Don't update call site if callee nmethod was replaced by an other nmethod
1270 // which may happen when multiply alive nmethod (tiered compilation)
1271 // will be supported.
1272 if (!callee_method->is_old() &&
1273 (callee == NULL || (callee->is_in_use() && callee_method->code() == callee))) {
1274 #ifdef ASSERT
1275 // We must not try to patch to jump to an already unloaded method.
1276 if (dest_entry_point != 0) {
1277 CodeBlob* cb = CodeCache::find_blob(dest_entry_point);
1278 assert((cb != NULL) && cb->is_compiled() && (((CompiledMethod*)cb) == callee),
1279 "should not call unloaded nmethod");
1280 }
1281 #endif
1282 if (is_virtual) {
1283 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1284 if (inline_cache->is_clean()) {
1285 if (!inline_cache->set_to_monomorphic(virtual_call_info)) {
1286 return false;
1287 }
1288 }
1289 } else {
1290 if (VM_Version::supports_fast_class_init_checks() &&
1291 invoke_code == Bytecodes::_invokestatic &&
1292 callee_method->needs_clinit_barrier() &&
1293 callee != NULL && (callee->is_compiled_by_jvmci() || callee->is_aot())) {
1294 return true; // skip patching for JVMCI or AOT code
1295 }
1296 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_before(caller_frame.pc());
1297 if (ssc->is_clean()) ssc->set(static_call_info);
1298 }
1299 }
1300 } // unlock CompiledICLocker
1301 return true;
1302 }
1303
1304 // Resolves a call. The compilers generate code for calls that go here
1305 // and are patched with the real destination of the call.
1306 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread,
1307 bool is_virtual,
1308 bool is_optimized, TRAPS) {
1309
1310 ResourceMark rm(thread);
1311 RegisterMap cbl_map(thread, false);
1312 frame caller_frame = thread->last_frame().sender(&cbl_map);
1313
1314 CodeBlob* caller_cb = caller_frame.cb();
1315 guarantee(caller_cb != NULL && caller_cb->is_compiled(), "must be called from compiled method");
1316 CompiledMethod* caller_nm = caller_cb->as_compiled_method_or_null();
1317
1318 // make sure caller is not getting deoptimized
1319 // and removed before we are done with it.
1320 // CLEANUP - with lazy deopt shouldn't need this lock
1321 nmethodLocker caller_lock(caller_nm);
1322
1323 // determine call info & receiver
1324 // note: a) receiver is NULL for static calls
1325 // b) an exception is thrown if receiver is NULL for non-static calls
1326 CallInfo call_info;
1327 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1328 Handle receiver = find_callee_info(thread, invoke_code,
1329 call_info, CHECK_(methodHandle()));
1330 methodHandle callee_method = call_info.selected_method();
1331
1332 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1333 (!is_virtual && invoke_code == Bytecodes::_invokespecial) ||
1334 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1335 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1336 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1337
1338 assert(caller_nm->is_alive() && !caller_nm->is_unloading(), "It should be alive");
1339
1340 #ifndef PRODUCT
1341 // tracing/debugging/statistics
1342 int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
1343 (is_virtual) ? (&_resolve_virtual_ctr) :
1344 (&_resolve_static_ctr);
1345 Atomic::inc(addr);
1346
1347 if (TraceCallFixup) {
1348 ResourceMark rm(thread);
1349 tty->print("resolving %s%s (%s) call to",
1350 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
1351 Bytecodes::name(invoke_code));
1352 callee_method->print_short_name(tty);
1353 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT,
1354 p2i(caller_frame.pc()), p2i(callee_method->code()));
1355 }
1356 #endif
1357
1358 if (invoke_code == Bytecodes::_invokestatic) {
1359 assert(callee_method->method_holder()->is_initialized() ||
1360 callee_method->method_holder()->is_reentrant_initialization(thread),
1361 "invalid class initialization state for invoke_static");
1362 if (!VM_Version::supports_fast_class_init_checks() && callee_method->needs_clinit_barrier()) {
1363 // In order to keep class initialization check, do not patch call
1364 // site for static call when the class is not fully initialized.
1365 // Proper check is enforced by call site re-resolution on every invocation.
1366 //
1367 // When fast class initialization checks are supported (VM_Version::supports_fast_class_init_checks() == true),
1368 // explicit class initialization check is put in nmethod entry (VEP).
1369 assert(callee_method->method_holder()->is_linked(), "must be");
1370 return callee_method;
1371 }
1372 }
1373
1374 // JSR 292 key invariant:
1375 // If the resolved method is a MethodHandle invoke target, the call
1376 // site must be a MethodHandle call site, because the lambda form might tail-call
1377 // leaving the stack in a state unknown to either caller or callee
1378 // TODO detune for now but we might need it again
1379 // assert(!callee_method->is_compiled_lambda_form() ||
1380 // caller_nm->is_method_handle_return(caller_frame.pc()), "must be MH call site");
1381
1382 // Compute entry points. This might require generation of C2I converter
1383 // frames, so we cannot be holding any locks here. Furthermore, the
1384 // computation of the entry points is independent of patching the call. We
1385 // always return the entry-point, but we only patch the stub if the call has
1386 // not been deoptimized. Return values: For a virtual call this is an
1387 // (cached_oop, destination address) pair. For a static call/optimized
1388 // virtual this is just a destination address.
1389
1390 // Patching IC caches may fail if we run out if transition stubs.
1391 // We refill the ic stubs then and try again.
1392 for (;;) {
1393 ICRefillVerifier ic_refill_verifier;
1394 bool successful = resolve_sub_helper_internal(callee_method, caller_frame, caller_nm,
1395 is_virtual, is_optimized, receiver,
1396 call_info, invoke_code, CHECK_(methodHandle()));
1397 if (successful) {
1398 return callee_method;
1399 } else {
1400 InlineCacheBuffer::refill_ic_stubs();
1401 }
1402 }
1403
1404 }
1405
1406
1407 // Inline caches exist only in compiled code
1408 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread))
1409 #ifdef ASSERT
1410 RegisterMap reg_map(thread, false);
1411 frame stub_frame = thread->last_frame();
1412 assert(stub_frame.is_runtime_frame(), "sanity check");
1413 frame caller_frame = stub_frame.sender(®_map);
1414 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame");
1415 #endif /* ASSERT */
1416
1417 methodHandle callee_method;
1418 JRT_BLOCK
1419 callee_method = SharedRuntime::handle_ic_miss_helper(thread, CHECK_NULL);
1420 // Return Method* through TLS
1421 thread->set_vm_result_2(callee_method());
1422 JRT_BLOCK_END
1423 // return compiled code entry point after potential safepoints
1424 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1425 return callee_method->verified_code_entry();
1426 JRT_END
1427
1428
1429 // Handle call site that has been made non-entrant
1430 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread))
1431 // 6243940 We might end up in here if the callee is deoptimized
1432 // as we race to call it. We don't want to take a safepoint if
1433 // the caller was interpreted because the caller frame will look
1434 // interpreted to the stack walkers and arguments are now
1435 // "compiled" so it is much better to make this transition
1436 // invisible to the stack walking code. The i2c path will
1437 // place the callee method in the callee_target. It is stashed
1438 // there because if we try and find the callee by normal means a
1439 // safepoint is possible and have trouble gc'ing the compiled args.
1440 RegisterMap reg_map(thread, false);
1441 frame stub_frame = thread->last_frame();
1442 assert(stub_frame.is_runtime_frame(), "sanity check");
1443 frame caller_frame = stub_frame.sender(®_map);
1444
1445 if (caller_frame.is_interpreted_frame() ||
1446 caller_frame.is_entry_frame()) {
1447 Method* callee = thread->callee_target();
1448 guarantee(callee != NULL && callee->is_method(), "bad handshake");
1449 thread->set_vm_result_2(callee);
1450 thread->set_callee_target(NULL);
1451 if (caller_frame.is_entry_frame() && VM_Version::supports_fast_class_init_checks()) {
1452 // Bypass class initialization checks in c2i when caller is in native.
1453 // JNI calls to static methods don't have class initialization checks.
1454 // Fast class initialization checks are present in c2i adapters and call into
1455 // SharedRuntime::handle_wrong_method() on the slow path.
1456 //
1457 // JVM upcalls may land here as well, but there's a proper check present in
1458 // LinkResolver::resolve_static_call (called from JavaCalls::call_static),
1459 // so bypassing it in c2i adapter is benign.
1460 return callee->get_c2i_no_clinit_check_entry();
1461 } else {
1462 return callee->get_c2i_entry();
1463 }
1464 }
1465
1466 // Must be compiled to compiled path which is safe to stackwalk
1467 methodHandle callee_method;
1468 JRT_BLOCK
1469 // Force resolving of caller (if we called from compiled frame)
1470 callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_NULL);
1471 thread->set_vm_result_2(callee_method());
1472 JRT_BLOCK_END
1473 // return compiled code entry point after potential safepoints
1474 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1475 return callee_method->verified_code_entry();
1476 JRT_END
1477
1478 // Handle abstract method call
1479 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* thread))
1480 // Verbose error message for AbstractMethodError.
1481 // Get the called method from the invoke bytecode.
1482 vframeStream vfst(thread, true);
1483 assert(!vfst.at_end(), "Java frame must exist");
1484 methodHandle caller(vfst.method());
1485 Bytecode_invoke invoke(caller, vfst.bci());
1486 DEBUG_ONLY( invoke.verify(); )
1487
1488 // Find the compiled caller frame.
1489 RegisterMap reg_map(thread);
1490 frame stubFrame = thread->last_frame();
1491 assert(stubFrame.is_runtime_frame(), "must be");
1492 frame callerFrame = stubFrame.sender(®_map);
1493 assert(callerFrame.is_compiled_frame(), "must be");
1494
1495 // Install exception and return forward entry.
1496 address res = StubRoutines::throw_AbstractMethodError_entry();
1497 JRT_BLOCK
1498 methodHandle callee = invoke.static_target(thread);
1499 if (!callee.is_null()) {
1500 oop recv = callerFrame.retrieve_receiver(®_map);
1501 Klass *recv_klass = (recv != NULL) ? recv->klass() : NULL;
1502 LinkResolver::throw_abstract_method_error(callee, recv_klass, thread);
1503 res = StubRoutines::forward_exception_entry();
1504 }
1505 JRT_BLOCK_END
1506 return res;
1507 JRT_END
1508
1509
1510 // resolve a static call and patch code
1511 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread ))
1512 methodHandle callee_method;
1513 JRT_BLOCK
1514 callee_method = SharedRuntime::resolve_helper(thread, false, false, CHECK_NULL);
1515 thread->set_vm_result_2(callee_method());
1516 JRT_BLOCK_END
1517 // return compiled code entry point after potential safepoints
1518 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1519 return callee_method->verified_code_entry();
1520 JRT_END
1521
1522
1523 // resolve virtual call and update inline cache to monomorphic
1524 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread ))
1525 methodHandle callee_method;
1526 JRT_BLOCK
1527 callee_method = SharedRuntime::resolve_helper(thread, true, false, CHECK_NULL);
1528 thread->set_vm_result_2(callee_method());
1529 JRT_BLOCK_END
1530 // return compiled code entry point after potential safepoints
1531 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1532 return callee_method->verified_code_entry();
1533 JRT_END
1534
1535
1536 // Resolve a virtual call that can be statically bound (e.g., always
1537 // monomorphic, so it has no inline cache). Patch code to resolved target.
1538 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread))
1539 methodHandle callee_method;
1540 JRT_BLOCK
1541 callee_method = SharedRuntime::resolve_helper(thread, true, true, CHECK_NULL);
1542 thread->set_vm_result_2(callee_method());
1543 JRT_BLOCK_END
1544 // return compiled code entry point after potential safepoints
1545 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1546 return callee_method->verified_code_entry();
1547 JRT_END
1548
1549 // The handle_ic_miss_helper_internal function returns false if it failed due
1550 // to either running out of vtable stubs or ic stubs due to IC transitions
1551 // to transitional states. The needs_ic_stub_refill value will be set if
1552 // the failure was due to running out of IC stubs, in which case handle_ic_miss_helper
1553 // refills the IC stubs and tries again.
1554 bool SharedRuntime::handle_ic_miss_helper_internal(Handle receiver, CompiledMethod* caller_nm,
1555 const frame& caller_frame, methodHandle callee_method,
1556 Bytecodes::Code bc, CallInfo& call_info,
1557 bool& needs_ic_stub_refill, TRAPS) {
1558 CompiledICLocker ml(caller_nm);
1559 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1560 bool should_be_mono = false;
1561 if (inline_cache->is_optimized()) {
1562 if (TraceCallFixup) {
1563 ResourceMark rm(THREAD);
1564 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc));
1565 callee_method->print_short_name(tty);
1566 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1567 }
1568 should_be_mono = true;
1569 } else if (inline_cache->is_icholder_call()) {
1570 CompiledICHolder* ic_oop = inline_cache->cached_icholder();
1571 if (ic_oop != NULL) {
1572 if (!ic_oop->is_loader_alive()) {
1573 // Deferred IC cleaning due to concurrent class unloading
1574 if (!inline_cache->set_to_clean()) {
1575 needs_ic_stub_refill = true;
1576 return false;
1577 }
1578 } else if (receiver()->klass() == ic_oop->holder_klass()) {
1579 // This isn't a real miss. We must have seen that compiled code
1580 // is now available and we want the call site converted to a
1581 // monomorphic compiled call site.
1582 // We can't assert for callee_method->code() != NULL because it
1583 // could have been deoptimized in the meantime
1584 if (TraceCallFixup) {
1585 ResourceMark rm(THREAD);
1586 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc));
1587 callee_method->print_short_name(tty);
1588 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1589 }
1590 should_be_mono = true;
1591 }
1592 }
1593 }
1594
1595 if (should_be_mono) {
1596 // We have a path that was monomorphic but was going interpreted
1597 // and now we have (or had) a compiled entry. We correct the IC
1598 // by using a new icBuffer.
1599 CompiledICInfo info;
1600 Klass* receiver_klass = receiver()->klass();
1601 inline_cache->compute_monomorphic_entry(callee_method,
1602 receiver_klass,
1603 inline_cache->is_optimized(),
1604 false, caller_nm->is_nmethod(),
1605 info, CHECK_false);
1606 if (!inline_cache->set_to_monomorphic(info)) {
1607 needs_ic_stub_refill = true;
1608 return false;
1609 }
1610 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) {
1611 // Potential change to megamorphic
1612
1613 bool successful = inline_cache->set_to_megamorphic(&call_info, bc, needs_ic_stub_refill, CHECK_false);
1614 if (needs_ic_stub_refill) {
1615 return false;
1616 }
1617 if (!successful) {
1618 if (!inline_cache->set_to_clean()) {
1619 needs_ic_stub_refill = true;
1620 return false;
1621 }
1622 }
1623 } else {
1624 // Either clean or megamorphic
1625 }
1626 return true;
1627 }
1628
1629 methodHandle SharedRuntime::handle_ic_miss_helper(JavaThread *thread, TRAPS) {
1630 ResourceMark rm(thread);
1631 CallInfo call_info;
1632 Bytecodes::Code bc;
1633
1634 // receiver is NULL for static calls. An exception is thrown for NULL
1635 // receivers for non-static calls
1636 Handle receiver = find_callee_info(thread, bc, call_info,
1637 CHECK_(methodHandle()));
1638 // Compiler1 can produce virtual call sites that can actually be statically bound
1639 // If we fell thru to below we would think that the site was going megamorphic
1640 // when in fact the site can never miss. Worse because we'd think it was megamorphic
1641 // we'd try and do a vtable dispatch however methods that can be statically bound
1642 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a
1643 // reresolution of the call site (as if we did a handle_wrong_method and not an
1644 // plain ic_miss) and the site will be converted to an optimized virtual call site
1645 // never to miss again. I don't believe C2 will produce code like this but if it
1646 // did this would still be the correct thing to do for it too, hence no ifdef.
1647 //
1648 if (call_info.resolved_method()->can_be_statically_bound()) {
1649 methodHandle callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_(methodHandle()));
1650 if (TraceCallFixup) {
1651 RegisterMap reg_map(thread, false);
1652 frame caller_frame = thread->last_frame().sender(®_map);
1653 ResourceMark rm(thread);
1654 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc));
1655 callee_method->print_short_name(tty);
1656 tty->print_cr(" from pc: " INTPTR_FORMAT, p2i(caller_frame.pc()));
1657 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1658 }
1659 return callee_method;
1660 }
1661
1662 methodHandle callee_method = call_info.selected_method();
1663
1664 #ifndef PRODUCT
1665 Atomic::inc(&_ic_miss_ctr);
1666
1667 // Statistics & Tracing
1668 if (TraceCallFixup) {
1669 ResourceMark rm(thread);
1670 tty->print("IC miss (%s) call to", Bytecodes::name(bc));
1671 callee_method->print_short_name(tty);
1672 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1673 }
1674
1675 if (ICMissHistogram) {
1676 MutexLocker m(VMStatistic_lock);
1677 RegisterMap reg_map(thread, false);
1678 frame f = thread->last_frame().real_sender(®_map);// skip runtime stub
1679 // produce statistics under the lock
1680 trace_ic_miss(f.pc());
1681 }
1682 #endif
1683
1684 // install an event collector so that when a vtable stub is created the
1685 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1686 // event can't be posted when the stub is created as locks are held
1687 // - instead the event will be deferred until the event collector goes
1688 // out of scope.
1689 JvmtiDynamicCodeEventCollector event_collector;
1690
1691 // Update inline cache to megamorphic. Skip update if we are called from interpreted.
1692 // Transitioning IC caches may require transition stubs. If we run out
1693 // of transition stubs, we have to drop locks and perform a safepoint
1694 // that refills them.
1695 RegisterMap reg_map(thread, false);
1696 frame caller_frame = thread->last_frame().sender(®_map);
1697 CodeBlob* cb = caller_frame.cb();
1698 CompiledMethod* caller_nm = cb->as_compiled_method();
1699
1700 for (;;) {
1701 ICRefillVerifier ic_refill_verifier;
1702 bool needs_ic_stub_refill = false;
1703 bool successful = handle_ic_miss_helper_internal(receiver, caller_nm, caller_frame, callee_method,
1704 bc, call_info, needs_ic_stub_refill, CHECK_(methodHandle()));
1705 if (successful || !needs_ic_stub_refill) {
1706 return callee_method;
1707 } else {
1708 InlineCacheBuffer::refill_ic_stubs();
1709 }
1710 }
1711 }
1712
1713 static bool clear_ic_at_addr(CompiledMethod* caller_nm, address call_addr, bool is_static_call) {
1714 CompiledICLocker ml(caller_nm);
1715 if (is_static_call) {
1716 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_at(call_addr);
1717 if (!ssc->is_clean()) {
1718 return ssc->set_to_clean();
1719 }
1720 } else {
1721 // compiled, dispatched call (which used to call an interpreted method)
1722 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1723 if (!inline_cache->is_clean()) {
1724 return inline_cache->set_to_clean();
1725 }
1726 }
1727 return true;
1728 }
1729
1730 //
1731 // Resets a call-site in compiled code so it will get resolved again.
1732 // This routines handles both virtual call sites, optimized virtual call
1733 // sites, and static call sites. Typically used to change a call sites
1734 // destination from compiled to interpreted.
1735 //
1736 methodHandle SharedRuntime::reresolve_call_site(JavaThread *thread, TRAPS) {
1737 ResourceMark rm(thread);
1738 RegisterMap reg_map(thread, false);
1739 frame stub_frame = thread->last_frame();
1740 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1741 frame caller = stub_frame.sender(®_map);
1742
1743 // Do nothing if the frame isn't a live compiled frame.
1744 // nmethod could be deoptimized by the time we get here
1745 // so no update to the caller is needed.
1746
1747 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) {
1748
1749 address pc = caller.pc();
1750
1751 // Check for static or virtual call
1752 bool is_static_call = false;
1753 CompiledMethod* caller_nm = CodeCache::find_compiled(pc);
1754
1755 // Default call_addr is the location of the "basic" call.
1756 // Determine the address of the call we a reresolving. With
1757 // Inline Caches we will always find a recognizable call.
1758 // With Inline Caches disabled we may or may not find a
1759 // recognizable call. We will always find a call for static
1760 // calls and for optimized virtual calls. For vanilla virtual
1761 // calls it depends on the state of the UseInlineCaches switch.
1762 //
1763 // With Inline Caches disabled we can get here for a virtual call
1764 // for two reasons:
1765 // 1 - calling an abstract method. The vtable for abstract methods
1766 // will run us thru handle_wrong_method and we will eventually
1767 // end up in the interpreter to throw the ame.
1768 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1769 // call and between the time we fetch the entry address and
1770 // we jump to it the target gets deoptimized. Similar to 1
1771 // we will wind up in the interprter (thru a c2i with c2).
1772 //
1773 address call_addr = NULL;
1774 {
1775 // Get call instruction under lock because another thread may be
1776 // busy patching it.
1777 CompiledICLocker ml(caller_nm);
1778 // Location of call instruction
1779 call_addr = caller_nm->call_instruction_address(pc);
1780 }
1781 // Make sure nmethod doesn't get deoptimized and removed until
1782 // this is done with it.
1783 // CLEANUP - with lazy deopt shouldn't need this lock
1784 nmethodLocker nmlock(caller_nm);
1785
1786 if (call_addr != NULL) {
1787 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1788 int ret = iter.next(); // Get item
1789 if (ret) {
1790 assert(iter.addr() == call_addr, "must find call");
1791 if (iter.type() == relocInfo::static_call_type) {
1792 is_static_call = true;
1793 } else {
1794 assert(iter.type() == relocInfo::virtual_call_type ||
1795 iter.type() == relocInfo::opt_virtual_call_type
1796 , "unexpected relocInfo. type");
1797 }
1798 } else {
1799 assert(!UseInlineCaches, "relocation info. must exist for this address");
1800 }
1801
1802 // Cleaning the inline cache will force a new resolve. This is more robust
1803 // than directly setting it to the new destination, since resolving of calls
1804 // is always done through the same code path. (experience shows that it
1805 // leads to very hard to track down bugs, if an inline cache gets updated
1806 // to a wrong method). It should not be performance critical, since the
1807 // resolve is only done once.
1808
1809 for (;;) {
1810 ICRefillVerifier ic_refill_verifier;
1811 if (!clear_ic_at_addr(caller_nm, call_addr, is_static_call)) {
1812 InlineCacheBuffer::refill_ic_stubs();
1813 } else {
1814 break;
1815 }
1816 }
1817 }
1818 }
1819
1820 methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle()));
1821
1822
1823 #ifndef PRODUCT
1824 Atomic::inc(&_wrong_method_ctr);
1825
1826 if (TraceCallFixup) {
1827 ResourceMark rm(thread);
1828 tty->print("handle_wrong_method reresolving call to");
1829 callee_method->print_short_name(tty);
1830 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1831 }
1832 #endif
1833
1834 return callee_method;
1835 }
1836
1837 address SharedRuntime::handle_unsafe_access(JavaThread* thread, address next_pc) {
1838 // The faulting unsafe accesses should be changed to throw the error
1839 // synchronously instead. Meanwhile the faulting instruction will be
1840 // skipped over (effectively turning it into a no-op) and an
1841 // asynchronous exception will be raised which the thread will
1842 // handle at a later point. If the instruction is a load it will
1843 // return garbage.
1844
1845 // Request an async exception.
1846 thread->set_pending_unsafe_access_error();
1847
1848 // Return address of next instruction to execute.
1849 return next_pc;
1850 }
1851
1852 #ifdef ASSERT
1853 void SharedRuntime::check_member_name_argument_is_last_argument(const methodHandle& method,
1854 const BasicType* sig_bt,
1855 const VMRegPair* regs) {
1856 ResourceMark rm;
1857 const int total_args_passed = method->size_of_parameters();
1858 const VMRegPair* regs_with_member_name = regs;
1859 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1);
1860
1861 const int member_arg_pos = total_args_passed - 1;
1862 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob");
1863 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object");
1864
1865 const bool is_outgoing = method->is_method_handle_intrinsic();
1866 int comp_args_on_stack = java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1, is_outgoing);
1867
1868 for (int i = 0; i < member_arg_pos; i++) {
1869 VMReg a = regs_with_member_name[i].first();
1870 VMReg b = regs_without_member_name[i].first();
1871 assert(a->value() == b->value(), "register allocation mismatch: a=" INTX_FORMAT ", b=" INTX_FORMAT, a->value(), b->value());
1872 }
1873 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg");
1874 }
1875 #endif
1876
1877 bool SharedRuntime::should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb) {
1878 if (destination != entry_point) {
1879 CodeBlob* callee = CodeCache::find_blob(destination);
1880 // callee == cb seems weird. It means calling interpreter thru stub.
1881 if (callee != NULL && (callee == cb || callee->is_adapter_blob())) {
1882 // static call or optimized virtual
1883 if (TraceCallFixup) {
1884 tty->print("fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1885 moop->print_short_name(tty);
1886 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
1887 }
1888 return true;
1889 } else {
1890 if (TraceCallFixup) {
1891 tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1892 moop->print_short_name(tty);
1893 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
1894 }
1895 // assert is too strong could also be resolve destinations.
1896 // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be");
1897 }
1898 } else {
1899 if (TraceCallFixup) {
1900 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1901 moop->print_short_name(tty);
1902 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
1903 }
1904 }
1905 return false;
1906 }
1907
1908 // ---------------------------------------------------------------------------
1909 // We are calling the interpreter via a c2i. Normally this would mean that
1910 // we were called by a compiled method. However we could have lost a race
1911 // where we went int -> i2c -> c2i and so the caller could in fact be
1912 // interpreted. If the caller is compiled we attempt to patch the caller
1913 // so he no longer calls into the interpreter.
1914 JRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc))
1915 Method* moop(method);
1916
1917 address entry_point = moop->from_compiled_entry_no_trampoline();
1918
1919 // It's possible that deoptimization can occur at a call site which hasn't
1920 // been resolved yet, in which case this function will be called from
1921 // an nmethod that has been patched for deopt and we can ignore the
1922 // request for a fixup.
1923 // Also it is possible that we lost a race in that from_compiled_entry
1924 // is now back to the i2c in that case we don't need to patch and if
1925 // we did we'd leap into space because the callsite needs to use
1926 // "to interpreter" stub in order to load up the Method*. Don't
1927 // ask me how I know this...
1928
1929 CodeBlob* cb = CodeCache::find_blob(caller_pc);
1930 if (cb == NULL || !cb->is_compiled() || entry_point == moop->get_c2i_entry()) {
1931 return;
1932 }
1933
1934 // The check above makes sure this is a nmethod.
1935 CompiledMethod* nm = cb->as_compiled_method_or_null();
1936 assert(nm, "must be");
1937
1938 // Get the return PC for the passed caller PC.
1939 address return_pc = caller_pc + frame::pc_return_offset;
1940
1941 // There is a benign race here. We could be attempting to patch to a compiled
1942 // entry point at the same time the callee is being deoptimized. If that is
1943 // the case then entry_point may in fact point to a c2i and we'd patch the
1944 // call site with the same old data. clear_code will set code() to NULL
1945 // at the end of it. If we happen to see that NULL then we can skip trying
1946 // to patch. If we hit the window where the callee has a c2i in the
1947 // from_compiled_entry and the NULL isn't present yet then we lose the race
1948 // and patch the code with the same old data. Asi es la vida.
1949
1950 if (moop->code() == NULL) return;
1951
1952 if (nm->is_in_use()) {
1953 // Expect to find a native call there (unless it was no-inline cache vtable dispatch)
1954 CompiledICLocker ic_locker(nm);
1955 if (NativeCall::is_call_before(return_pc)) {
1956 ResourceMark mark;
1957 NativeCallWrapper* call = nm->call_wrapper_before(return_pc);
1958 //
1959 // bug 6281185. We might get here after resolving a call site to a vanilla
1960 // virtual call. Because the resolvee uses the verified entry it may then
1961 // see compiled code and attempt to patch the site by calling us. This would
1962 // then incorrectly convert the call site to optimized and its downhill from
1963 // there. If you're lucky you'll get the assert in the bugid, if not you've
1964 // just made a call site that could be megamorphic into a monomorphic site
1965 // for the rest of its life! Just another racing bug in the life of
1966 // fixup_callers_callsite ...
1967 //
1968 RelocIterator iter(nm, call->instruction_address(), call->next_instruction_address());
1969 iter.next();
1970 assert(iter.has_current(), "must have a reloc at java call site");
1971 relocInfo::relocType typ = iter.reloc()->type();
1972 if (typ != relocInfo::static_call_type &&
1973 typ != relocInfo::opt_virtual_call_type &&
1974 typ != relocInfo::static_stub_type) {
1975 return;
1976 }
1977 address destination = call->destination();
1978 if (should_fixup_call_destination(destination, entry_point, caller_pc, moop, cb)) {
1979 call->set_destination_mt_safe(entry_point);
1980 }
1981 }
1982 }
1983 JRT_END
1984
1985
1986 // same as JVM_Arraycopy, but called directly from compiled code
1987 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos,
1988 oopDesc* dest, jint dest_pos,
1989 jint length,
1990 JavaThread* thread)) {
1991 #ifndef PRODUCT
1992 _slow_array_copy_ctr++;
1993 #endif
1994 // Check if we have null pointers
1995 if (src == NULL || dest == NULL) {
1996 THROW(vmSymbols::java_lang_NullPointerException());
1997 }
1998 // Do the copy. The casts to arrayOop are necessary to the copy_array API,
1999 // even though the copy_array API also performs dynamic checks to ensure
2000 // that src and dest are truly arrays (and are conformable).
2001 // The copy_array mechanism is awkward and could be removed, but
2002 // the compilers don't call this function except as a last resort,
2003 // so it probably doesn't matter.
2004 src->klass()->copy_array((arrayOopDesc*)src, src_pos,
2005 (arrayOopDesc*)dest, dest_pos,
2006 length, thread);
2007 }
2008 JRT_END
2009
2010 // The caller of generate_class_cast_message() (or one of its callers)
2011 // must use a ResourceMark in order to correctly free the result.
2012 char* SharedRuntime::generate_class_cast_message(
2013 JavaThread* thread, Klass* caster_klass) {
2014
2015 // Get target class name from the checkcast instruction
2016 vframeStream vfst(thread, true);
2017 assert(!vfst.at_end(), "Java frame must exist");
2018 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci()));
2019 constantPoolHandle cpool(thread, vfst.method()->constants());
2020 Klass* target_klass = ConstantPool::klass_at_if_loaded(cpool, cc.index());
2021 Symbol* target_klass_name = NULL;
2022 if (target_klass == NULL) {
2023 // This klass should be resolved, but just in case, get the name in the klass slot.
2024 target_klass_name = cpool->klass_name_at(cc.index());
2025 }
2026 return generate_class_cast_message(caster_klass, target_klass, target_klass_name);
2027 }
2028
2029
2030 // The caller of generate_class_cast_message() (or one of its callers)
2031 // must use a ResourceMark in order to correctly free the result.
2032 char* SharedRuntime::generate_class_cast_message(
2033 Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name) {
2034 const char* caster_name = caster_klass->external_name();
2035
2036 assert(target_klass != NULL || target_klass_name != NULL, "one must be provided");
2037 const char* target_name = target_klass == NULL ? target_klass_name->as_klass_external_name() :
2038 target_klass->external_name();
2039
2040 size_t msglen = strlen(caster_name) + strlen("class ") + strlen(" cannot be cast to class ") + strlen(target_name) + 1;
2041
2042 const char* caster_klass_description = "";
2043 const char* target_klass_description = "";
2044 const char* klass_separator = "";
2045 if (target_klass != NULL && caster_klass->module() == target_klass->module()) {
2046 caster_klass_description = caster_klass->joint_in_module_of_loader(target_klass);
2047 } else {
2048 caster_klass_description = caster_klass->class_in_module_of_loader();
2049 target_klass_description = (target_klass != NULL) ? target_klass->class_in_module_of_loader() : "";
2050 klass_separator = (target_klass != NULL) ? "; " : "";
2051 }
2052
2053 // add 3 for parenthesis and preceeding space
2054 msglen += strlen(caster_klass_description) + strlen(target_klass_description) + strlen(klass_separator) + 3;
2055
2056 char* message = NEW_RESOURCE_ARRAY_RETURN_NULL(char, msglen);
2057 if (message == NULL) {
2058 // Shouldn't happen, but don't cause even more problems if it does
2059 message = const_cast<char*>(caster_klass->external_name());
2060 } else {
2061 jio_snprintf(message,
2062 msglen,
2063 "class %s cannot be cast to class %s (%s%s%s)",
2064 caster_name,
2065 target_name,
2066 caster_klass_description,
2067 klass_separator,
2068 target_klass_description
2069 );
2070 }
2071 return message;
2072 }
2073
2074 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
2075 (void) JavaThread::current()->reguard_stack();
2076 JRT_END
2077
2078
2079 // Handles the uncommon case in locking, i.e., contention or an inflated lock.
2080 JRT_BLOCK_ENTRY(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread))
2081 if (!SafepointSynchronize::is_synchronizing()) {
2082 // Only try quick_enter() if we're not trying to reach a safepoint
2083 // so that the calling thread reaches the safepoint more quickly.
2084 if (ObjectSynchronizer::quick_enter(_obj, thread, lock)) return;
2085 }
2086 // NO_ASYNC required because an async exception on the state transition destructor
2087 // would leave you with the lock held and it would never be released.
2088 // The normal monitorenter NullPointerException is thrown without acquiring a lock
2089 // and the model is that an exception implies the method failed.
2090 JRT_BLOCK_NO_ASYNC
2091 oop obj(_obj);
2092 if (PrintBiasedLockingStatistics) {
2093 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
2094 }
2095 Handle h_obj(THREAD, obj);
2096 if (UseBiasedLocking) {
2097 // Retry fast entry if bias is revoked to avoid unnecessary inflation
2098 ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK);
2099 } else {
2100 ObjectSynchronizer::slow_enter(h_obj, lock, CHECK);
2101 }
2102 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
2103 JRT_BLOCK_END
2104 JRT_END
2105
2106 // Handles the uncommon cases of monitor unlocking in compiled code
2107 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock, JavaThread * THREAD))
2108 oop obj(_obj);
2109 assert(JavaThread::current() == THREAD, "invariant");
2110 // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore
2111 // testing was unable to ever fire the assert that guarded it so I have removed it.
2112 assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?");
2113 #undef MIGHT_HAVE_PENDING
2114 #ifdef MIGHT_HAVE_PENDING
2115 // Save and restore any pending_exception around the exception mark.
2116 // While the slow_exit must not throw an exception, we could come into
2117 // this routine with one set.
2118 oop pending_excep = NULL;
2119 const char* pending_file;
2120 int pending_line;
2121 if (HAS_PENDING_EXCEPTION) {
2122 pending_excep = PENDING_EXCEPTION;
2123 pending_file = THREAD->exception_file();
2124 pending_line = THREAD->exception_line();
2125 CLEAR_PENDING_EXCEPTION;
2126 }
2127 #endif /* MIGHT_HAVE_PENDING */
2128
2129 {
2130 // Exit must be non-blocking, and therefore no exceptions can be thrown.
2131 EXCEPTION_MARK;
2132 ObjectSynchronizer::slow_exit(obj, lock, THREAD);
2133 }
2134
2135 #ifdef MIGHT_HAVE_PENDING
2136 if (pending_excep != NULL) {
2137 THREAD->set_pending_exception(pending_excep, pending_file, pending_line);
2138 }
2139 #endif /* MIGHT_HAVE_PENDING */
2140 JRT_END
2141
2142 #ifndef PRODUCT
2143
2144 void SharedRuntime::print_statistics() {
2145 ttyLocker ttyl;
2146 if (xtty != NULL) xtty->head("statistics type='SharedRuntime'");
2147
2148 if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr);
2149
2150 SharedRuntime::print_ic_miss_histogram();
2151
2152 if (CountRemovableExceptions) {
2153 if (_nof_removable_exceptions > 0) {
2154 Unimplemented(); // this counter is not yet incremented
2155 tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions);
2156 }
2157 }
2158
2159 // Dump the JRT_ENTRY counters
2160 if (_new_instance_ctr) tty->print_cr("%5d new instance requires GC", _new_instance_ctr);
2161 if (_new_array_ctr) tty->print_cr("%5d new array requires GC", _new_array_ctr);
2162 if (_multi1_ctr) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr);
2163 if (_multi2_ctr) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr);
2164 if (_multi3_ctr) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr);
2165 if (_multi4_ctr) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr);
2166 if (_multi5_ctr) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr);
2167
2168 tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr);
2169 tty->print_cr("%5d wrong method", _wrong_method_ctr);
2170 tty->print_cr("%5d unresolved static call site", _resolve_static_ctr);
2171 tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr);
2172 tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr);
2173
2174 if (_mon_enter_stub_ctr) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr);
2175 if (_mon_exit_stub_ctr) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr);
2176 if (_mon_enter_ctr) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr);
2177 if (_mon_exit_ctr) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr);
2178 if (_partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr);
2179 if (_jbyte_array_copy_ctr) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr);
2180 if (_jshort_array_copy_ctr) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr);
2181 if (_jint_array_copy_ctr) tty->print_cr("%5d int array copies", _jint_array_copy_ctr);
2182 if (_jlong_array_copy_ctr) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr);
2183 if (_oop_array_copy_ctr) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr);
2184 if (_checkcast_array_copy_ctr) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr);
2185 if (_unsafe_array_copy_ctr) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr);
2186 if (_generic_array_copy_ctr) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr);
2187 if (_slow_array_copy_ctr) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr);
2188 if (_find_handler_ctr) tty->print_cr("%5d find exception handler", _find_handler_ctr);
2189 if (_rethrow_ctr) tty->print_cr("%5d rethrow handler", _rethrow_ctr);
2190
2191 AdapterHandlerLibrary::print_statistics();
2192
2193 if (xtty != NULL) xtty->tail("statistics");
2194 }
2195
2196 inline double percent(int x, int y) {
2197 return 100.0 * x / MAX2(y, 1);
2198 }
2199
2200 class MethodArityHistogram {
2201 public:
2202 enum { MAX_ARITY = 256 };
2203 private:
2204 static int _arity_histogram[MAX_ARITY]; // histogram of #args
2205 static int _size_histogram[MAX_ARITY]; // histogram of arg size in words
2206 static int _max_arity; // max. arity seen
2207 static int _max_size; // max. arg size seen
2208
2209 static void add_method_to_histogram(nmethod* nm) {
2210 if (CompiledMethod::nmethod_access_is_safe(nm)) {
2211 Method* method = nm->method();
2212 ArgumentCount args(method->signature());
2213 int arity = args.size() + (method->is_static() ? 0 : 1);
2214 int argsize = method->size_of_parameters();
2215 arity = MIN2(arity, MAX_ARITY-1);
2216 argsize = MIN2(argsize, MAX_ARITY-1);
2217 int count = method->compiled_invocation_count();
2218 _arity_histogram[arity] += count;
2219 _size_histogram[argsize] += count;
2220 _max_arity = MAX2(_max_arity, arity);
2221 _max_size = MAX2(_max_size, argsize);
2222 }
2223 }
2224
2225 void print_histogram_helper(int n, int* histo, const char* name) {
2226 const int N = MIN2(5, n);
2227 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2228 double sum = 0;
2229 double weighted_sum = 0;
2230 int i;
2231 for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; }
2232 double rest = sum;
2233 double percent = sum / 100;
2234 for (i = 0; i <= N; i++) {
2235 rest -= histo[i];
2236 tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent);
2237 }
2238 tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent);
2239 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n);
2240 }
2241
2242 void print_histogram() {
2243 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2244 print_histogram_helper(_max_arity, _arity_histogram, "arity");
2245 tty->print_cr("\nSame for parameter size (in words):");
2246 print_histogram_helper(_max_size, _size_histogram, "size");
2247 tty->cr();
2248 }
2249
2250 public:
2251 MethodArityHistogram() {
2252 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2253 _max_arity = _max_size = 0;
2254 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram[i] = 0;
2255 CodeCache::nmethods_do(add_method_to_histogram);
2256 print_histogram();
2257 }
2258 };
2259
2260 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY];
2261 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY];
2262 int MethodArityHistogram::_max_arity;
2263 int MethodArityHistogram::_max_size;
2264
2265 void SharedRuntime::print_call_statistics(int comp_total) {
2266 tty->print_cr("Calls from compiled code:");
2267 int total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls;
2268 int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls;
2269 int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls;
2270 tty->print_cr("\t%9d (%4.1f%%) total non-inlined ", total, percent(total, total));
2271 tty->print_cr("\t%9d (%4.1f%%) virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total));
2272 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls));
2273 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls));
2274 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_c, percent(mono_c, _nof_normal_calls));
2275 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls));
2276 tty->print_cr("\t%9d (%4.1f%%) interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total));
2277 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls));
2278 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls));
2279 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_i, percent(mono_i, _nof_interface_calls));
2280 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls));
2281 tty->print_cr("\t%9d (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total));
2282 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls));
2283 tty->cr();
2284 tty->print_cr("Note 1: counter updates are not MT-safe.");
2285 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
2286 tty->print_cr(" %% in nested categories are relative to their category");
2287 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
2288 tty->cr();
2289
2290 MethodArityHistogram h;
2291 }
2292 #endif
2293
2294
2295 // A simple wrapper class around the calling convention information
2296 // that allows sharing of adapters for the same calling convention.
2297 class AdapterFingerPrint : public CHeapObj<mtCode> {
2298 private:
2299 enum {
2300 _basic_type_bits = 4,
2301 _basic_type_mask = right_n_bits(_basic_type_bits),
2302 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2303 _compact_int_count = 3
2304 };
2305 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2306 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2307
2308 union {
2309 int _compact[_compact_int_count];
2310 int* _fingerprint;
2311 } _value;
2312 int _length; // A negative length indicates the fingerprint is in the compact form,
2313 // Otherwise _value._fingerprint is the array.
2314
2315 // Remap BasicTypes that are handled equivalently by the adapters.
2316 // These are correct for the current system but someday it might be
2317 // necessary to make this mapping platform dependent.
2318 static int adapter_encoding(BasicType in) {
2319 switch (in) {
2320 case T_BOOLEAN:
2321 case T_BYTE:
2322 case T_SHORT:
2323 case T_CHAR:
2324 // There are all promoted to T_INT in the calling convention
2325 return T_INT;
2326
2327 case T_OBJECT:
2328 case T_ARRAY:
2329 // In other words, we assume that any register good enough for
2330 // an int or long is good enough for a managed pointer.
2331 #ifdef _LP64
2332 return T_LONG;
2333 #else
2334 return T_INT;
2335 #endif
2336
2337 case T_INT:
2338 case T_LONG:
2339 case T_FLOAT:
2340 case T_DOUBLE:
2341 case T_VOID:
2342 return in;
2343
2344 default:
2345 ShouldNotReachHere();
2346 return T_CONFLICT;
2347 }
2348 }
2349
2350 public:
2351 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) {
2352 // The fingerprint is based on the BasicType signature encoded
2353 // into an array of ints with eight entries per int.
2354 int* ptr;
2355 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int;
2356 if (len <= _compact_int_count) {
2357 assert(_compact_int_count == 3, "else change next line");
2358 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0;
2359 // Storing the signature encoded as signed chars hits about 98%
2360 // of the time.
2361 _length = -len;
2362 ptr = _value._compact;
2363 } else {
2364 _length = len;
2365 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode);
2366 ptr = _value._fingerprint;
2367 }
2368
2369 // Now pack the BasicTypes with 8 per int
2370 int sig_index = 0;
2371 for (int index = 0; index < len; index++) {
2372 int value = 0;
2373 for (int byte = 0; byte < _basic_types_per_int; byte++) {
2374 int bt = ((sig_index < total_args_passed)
2375 ? adapter_encoding(sig_bt[sig_index++])
2376 : 0);
2377 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits");
2378 value = (value << _basic_type_bits) | bt;
2379 }
2380 ptr[index] = value;
2381 }
2382 }
2383
2384 ~AdapterFingerPrint() {
2385 if (_length > 0) {
2386 FREE_C_HEAP_ARRAY(int, _value._fingerprint);
2387 }
2388 }
2389
2390 int value(int index) {
2391 if (_length < 0) {
2392 return _value._compact[index];
2393 }
2394 return _value._fingerprint[index];
2395 }
2396 int length() {
2397 if (_length < 0) return -_length;
2398 return _length;
2399 }
2400
2401 bool is_compact() {
2402 return _length <= 0;
2403 }
2404
2405 unsigned int compute_hash() {
2406 int hash = 0;
2407 for (int i = 0; i < length(); i++) {
2408 int v = value(i);
2409 hash = (hash << 8) ^ v ^ (hash >> 5);
2410 }
2411 return (unsigned int)hash;
2412 }
2413
2414 const char* as_string() {
2415 stringStream st;
2416 st.print("0x");
2417 for (int i = 0; i < length(); i++) {
2418 st.print("%08x", value(i));
2419 }
2420 return st.as_string();
2421 }
2422
2423 bool equals(AdapterFingerPrint* other) {
2424 if (other->_length != _length) {
2425 return false;
2426 }
2427 if (_length < 0) {
2428 assert(_compact_int_count == 3, "else change next line");
2429 return _value._compact[0] == other->_value._compact[0] &&
2430 _value._compact[1] == other->_value._compact[1] &&
2431 _value._compact[2] == other->_value._compact[2];
2432 } else {
2433 for (int i = 0; i < _length; i++) {
2434 if (_value._fingerprint[i] != other->_value._fingerprint[i]) {
2435 return false;
2436 }
2437 }
2438 }
2439 return true;
2440 }
2441 };
2442
2443
2444 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
2445 class AdapterHandlerTable : public BasicHashtable<mtCode> {
2446 friend class AdapterHandlerTableIterator;
2447
2448 private:
2449
2450 #ifndef PRODUCT
2451 static int _lookups; // number of calls to lookup
2452 static int _buckets; // number of buckets checked
2453 static int _equals; // number of buckets checked with matching hash
2454 static int _hits; // number of successful lookups
2455 static int _compact; // number of equals calls with compact signature
2456 #endif
2457
2458 AdapterHandlerEntry* bucket(int i) {
2459 return (AdapterHandlerEntry*)BasicHashtable<mtCode>::bucket(i);
2460 }
2461
2462 public:
2463 AdapterHandlerTable()
2464 : BasicHashtable<mtCode>(293, (DumpSharedSpaces ? sizeof(CDSAdapterHandlerEntry) : sizeof(AdapterHandlerEntry))) { }
2465
2466 // Create a new entry suitable for insertion in the table
2467 AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry, address c2i_no_clinit_check_entry) {
2468 AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable<mtCode>::new_entry(fingerprint->compute_hash());
2469 entry->init(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry, c2i_no_clinit_check_entry);
2470 if (DumpSharedSpaces) {
2471 ((CDSAdapterHandlerEntry*)entry)->init();
2472 }
2473 return entry;
2474 }
2475
2476 // Insert an entry into the table
2477 void add(AdapterHandlerEntry* entry) {
2478 int index = hash_to_index(entry->hash());
2479 add_entry(index, entry);
2480 }
2481
2482 void free_entry(AdapterHandlerEntry* entry) {
2483 entry->deallocate();
2484 BasicHashtable<mtCode>::free_entry(entry);
2485 }
2486
2487 // Find a entry with the same fingerprint if it exists
2488 AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) {
2489 NOT_PRODUCT(_lookups++);
2490 AdapterFingerPrint fp(total_args_passed, sig_bt);
2491 unsigned int hash = fp.compute_hash();
2492 int index = hash_to_index(hash);
2493 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2494 NOT_PRODUCT(_buckets++);
2495 if (e->hash() == hash) {
2496 NOT_PRODUCT(_equals++);
2497 if (fp.equals(e->fingerprint())) {
2498 #ifndef PRODUCT
2499 if (fp.is_compact()) _compact++;
2500 _hits++;
2501 #endif
2502 return e;
2503 }
2504 }
2505 }
2506 return NULL;
2507 }
2508
2509 #ifndef PRODUCT
2510 void print_statistics() {
2511 ResourceMark rm;
2512 int longest = 0;
2513 int empty = 0;
2514 int total = 0;
2515 int nonempty = 0;
2516 for (int index = 0; index < table_size(); index++) {
2517 int count = 0;
2518 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2519 count++;
2520 }
2521 if (count != 0) nonempty++;
2522 if (count == 0) empty++;
2523 if (count > longest) longest = count;
2524 total += count;
2525 }
2526 tty->print_cr("AdapterHandlerTable: empty %d longest %d total %d average %f",
2527 empty, longest, total, total / (double)nonempty);
2528 tty->print_cr("AdapterHandlerTable: lookups %d buckets %d equals %d hits %d compact %d",
2529 _lookups, _buckets, _equals, _hits, _compact);
2530 }
2531 #endif
2532 };
2533
2534
2535 #ifndef PRODUCT
2536
2537 int AdapterHandlerTable::_lookups;
2538 int AdapterHandlerTable::_buckets;
2539 int AdapterHandlerTable::_equals;
2540 int AdapterHandlerTable::_hits;
2541 int AdapterHandlerTable::_compact;
2542
2543 #endif
2544
2545 class AdapterHandlerTableIterator : public StackObj {
2546 private:
2547 AdapterHandlerTable* _table;
2548 int _index;
2549 AdapterHandlerEntry* _current;
2550
2551 void scan() {
2552 while (_index < _table->table_size()) {
2553 AdapterHandlerEntry* a = _table->bucket(_index);
2554 _index++;
2555 if (a != NULL) {
2556 _current = a;
2557 return;
2558 }
2559 }
2560 }
2561
2562 public:
2563 AdapterHandlerTableIterator(AdapterHandlerTable* table): _table(table), _index(0), _current(NULL) {
2564 scan();
2565 }
2566 bool has_next() {
2567 return _current != NULL;
2568 }
2569 AdapterHandlerEntry* next() {
2570 if (_current != NULL) {
2571 AdapterHandlerEntry* result = _current;
2572 _current = _current->next();
2573 if (_current == NULL) scan();
2574 return result;
2575 } else {
2576 return NULL;
2577 }
2578 }
2579 };
2580
2581
2582 // ---------------------------------------------------------------------------
2583 // Implementation of AdapterHandlerLibrary
2584 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL;
2585 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL;
2586 const int AdapterHandlerLibrary_size = 16*K;
2587 BufferBlob* AdapterHandlerLibrary::_buffer = NULL;
2588
2589 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2590 // Should be called only when AdapterHandlerLibrary_lock is active.
2591 if (_buffer == NULL) // Initialize lazily
2592 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2593 return _buffer;
2594 }
2595
2596 extern "C" void unexpected_adapter_call() {
2597 ShouldNotCallThis();
2598 }
2599
2600 void AdapterHandlerLibrary::initialize() {
2601 if (_adapters != NULL) return;
2602 _adapters = new AdapterHandlerTable();
2603
2604 // Create a special handler for abstract methods. Abstract methods
2605 // are never compiled so an i2c entry is somewhat meaningless, but
2606 // throw AbstractMethodError just in case.
2607 // Pass wrong_method_abstract for the c2i transitions to return
2608 // AbstractMethodError for invalid invocations.
2609 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
2610 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL),
2611 StubRoutines::throw_AbstractMethodError_entry(),
2612 wrong_method_abstract, wrong_method_abstract);
2613 }
2614
2615 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint,
2616 address i2c_entry,
2617 address c2i_entry,
2618 address c2i_unverified_entry,
2619 address c2i_no_clinit_check_entry) {
2620 return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry, c2i_no_clinit_check_entry);
2621 }
2622
2623 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) {
2624 AdapterHandlerEntry* entry = get_adapter0(method);
2625 if (method->is_shared()) {
2626 // See comments around Method::link_method()
2627 MutexLocker mu(AdapterHandlerLibrary_lock);
2628 if (method->adapter() == NULL) {
2629 method->update_adapter_trampoline(entry);
2630 }
2631 address trampoline = method->from_compiled_entry();
2632 if (*(int*)trampoline == 0) {
2633 CodeBuffer buffer(trampoline, (int)SharedRuntime::trampoline_size());
2634 MacroAssembler _masm(&buffer);
2635 SharedRuntime::generate_trampoline(&_masm, entry->get_c2i_entry());
2636 assert(*(int*)trampoline != 0, "Instruction(s) for trampoline must not be encoded as zeros.");
2637
2638 if (PrintInterpreter) {
2639 Disassembler::decode(buffer.insts_begin(), buffer.insts_end());
2640 }
2641 }
2642 }
2643
2644 return entry;
2645 }
2646
2647 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter0(const methodHandle& method) {
2648 // Use customized signature handler. Need to lock around updates to
2649 // the AdapterHandlerTable (it is not safe for concurrent readers
2650 // and a single writer: this could be fixed if it becomes a
2651 // problem).
2652
2653 ResourceMark rm;
2654
2655 NOT_PRODUCT(int insts_size);
2656 AdapterBlob* new_adapter = NULL;
2657 AdapterHandlerEntry* entry = NULL;
2658 AdapterFingerPrint* fingerprint = NULL;
2659 {
2660 MutexLocker mu(AdapterHandlerLibrary_lock);
2661 // make sure data structure is initialized
2662 initialize();
2663
2664 if (method->is_abstract()) {
2665 return _abstract_method_handler;
2666 }
2667
2668 // Fill in the signature array, for the calling-convention call.
2669 int total_args_passed = method->size_of_parameters(); // All args on stack
2670
2671 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2672 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2673 int i = 0;
2674 if (!method->is_static()) // Pass in receiver first
2675 sig_bt[i++] = T_OBJECT;
2676 for (SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) {
2677 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2678 if (ss.type() == T_LONG || ss.type() == T_DOUBLE)
2679 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2680 }
2681 assert(i == total_args_passed, "");
2682
2683 // Lookup method signature's fingerprint
2684 entry = _adapters->lookup(total_args_passed, sig_bt);
2685
2686 #ifdef ASSERT
2687 AdapterHandlerEntry* shared_entry = NULL;
2688 // Start adapter sharing verification only after the VM is booted.
2689 if (VerifyAdapterSharing && (entry != NULL)) {
2690 shared_entry = entry;
2691 entry = NULL;
2692 }
2693 #endif
2694
2695 if (entry != NULL) {
2696 return entry;
2697 }
2698
2699 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
2700 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false);
2701
2702 // Make a C heap allocated version of the fingerprint to store in the adapter
2703 fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt);
2704
2705 // StubRoutines::code2() is initialized after this function can be called. As a result,
2706 // VerifyAdapterCalls and VerifyAdapterSharing can fail if we re-use code that generated
2707 // prior to StubRoutines::code2() being set. Checks refer to checks generated in an I2C
2708 // stub that ensure that an I2C stub is called from an interpreter frame.
2709 bool contains_all_checks = StubRoutines::code2() != NULL;
2710
2711 // Create I2C & C2I handlers
2712 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2713 if (buf != NULL) {
2714 CodeBuffer buffer(buf);
2715 short buffer_locs[20];
2716 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
2717 sizeof(buffer_locs)/sizeof(relocInfo));
2718
2719 MacroAssembler _masm(&buffer);
2720 entry = SharedRuntime::generate_i2c2i_adapters(&_masm,
2721 total_args_passed,
2722 comp_args_on_stack,
2723 sig_bt,
2724 regs,
2725 fingerprint);
2726 #ifdef ASSERT
2727 if (VerifyAdapterSharing) {
2728 if (shared_entry != NULL) {
2729 assert(shared_entry->compare_code(buf->code_begin(), buffer.insts_size()), "code must match");
2730 // Release the one just created and return the original
2731 _adapters->free_entry(entry);
2732 return shared_entry;
2733 } else {
2734 entry->save_code(buf->code_begin(), buffer.insts_size());
2735 }
2736 }
2737 #endif
2738
2739 new_adapter = AdapterBlob::create(&buffer);
2740 NOT_PRODUCT(insts_size = buffer.insts_size());
2741 }
2742 if (new_adapter == NULL) {
2743 // CodeCache is full, disable compilation
2744 // Ought to log this but compile log is only per compile thread
2745 // and we're some non descript Java thread.
2746 return NULL; // Out of CodeCache space
2747 }
2748 entry->relocate(new_adapter->content_begin());
2749 #ifndef PRODUCT
2750 // debugging suppport
2751 if (PrintAdapterHandlers || PrintStubCode) {
2752 ttyLocker ttyl;
2753 entry->print_adapter_on(tty);
2754 tty->print_cr("i2c argument handler #%d for: %s %s %s (%d bytes generated)",
2755 _adapters->number_of_entries(), (method->is_static() ? "static" : "receiver"),
2756 method->signature()->as_C_string(), fingerprint->as_string(), insts_size);
2757 tty->print_cr("c2i argument handler starts at %p", entry->get_c2i_entry());
2758 if (Verbose || PrintStubCode) {
2759 address first_pc = entry->base_address();
2760 if (first_pc != NULL) {
2761 Disassembler::decode(first_pc, first_pc + insts_size);
2762 tty->cr();
2763 }
2764 }
2765 }
2766 #endif
2767 // Add the entry only if the entry contains all required checks (see sharedRuntime_xxx.cpp)
2768 // The checks are inserted only if -XX:+VerifyAdapterCalls is specified.
2769 if (contains_all_checks || !VerifyAdapterCalls) {
2770 _adapters->add(entry);
2771 }
2772 }
2773 // Outside of the lock
2774 if (new_adapter != NULL) {
2775 char blob_id[256];
2776 jio_snprintf(blob_id,
2777 sizeof(blob_id),
2778 "%s(%s)@" PTR_FORMAT,
2779 new_adapter->name(),
2780 fingerprint->as_string(),
2781 new_adapter->content_begin());
2782 Forte::register_stub(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2783
2784 if (JvmtiExport::should_post_dynamic_code_generated()) {
2785 JvmtiExport::post_dynamic_code_generated(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2786 }
2787 }
2788 return entry;
2789 }
2790
2791 address AdapterHandlerEntry::base_address() {
2792 address base = _i2c_entry;
2793 if (base == NULL) base = _c2i_entry;
2794 assert(base <= _c2i_entry || _c2i_entry == NULL, "");
2795 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == NULL, "");
2796 assert(base <= _c2i_no_clinit_check_entry || _c2i_no_clinit_check_entry == NULL, "");
2797 return base;
2798 }
2799
2800 void AdapterHandlerEntry::relocate(address new_base) {
2801 address old_base = base_address();
2802 assert(old_base != NULL, "");
2803 ptrdiff_t delta = new_base - old_base;
2804 if (_i2c_entry != NULL)
2805 _i2c_entry += delta;
2806 if (_c2i_entry != NULL)
2807 _c2i_entry += delta;
2808 if (_c2i_unverified_entry != NULL)
2809 _c2i_unverified_entry += delta;
2810 if (_c2i_no_clinit_check_entry != NULL)
2811 _c2i_no_clinit_check_entry += delta;
2812 assert(base_address() == new_base, "");
2813 }
2814
2815
2816 void AdapterHandlerEntry::deallocate() {
2817 delete _fingerprint;
2818 #ifdef ASSERT
2819 if (_saved_code) FREE_C_HEAP_ARRAY(unsigned char, _saved_code);
2820 #endif
2821 }
2822
2823
2824 #ifdef ASSERT
2825 // Capture the code before relocation so that it can be compared
2826 // against other versions. If the code is captured after relocation
2827 // then relative instructions won't be equivalent.
2828 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
2829 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
2830 _saved_code_length = length;
2831 memcpy(_saved_code, buffer, length);
2832 }
2833
2834
2835 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length) {
2836 if (length != _saved_code_length) {
2837 return false;
2838 }
2839
2840 return (memcmp(buffer, _saved_code, length) == 0) ? true : false;
2841 }
2842 #endif
2843
2844
2845 /**
2846 * Create a native wrapper for this native method. The wrapper converts the
2847 * Java-compiled calling convention to the native convention, handles
2848 * arguments, and transitions to native. On return from the native we transition
2849 * back to java blocking if a safepoint is in progress.
2850 */
2851 void AdapterHandlerLibrary::create_native_wrapper(const methodHandle& method) {
2852 ResourceMark rm;
2853 nmethod* nm = NULL;
2854 address critical_entry = NULL;
2855
2856 assert(method->is_native(), "must be native");
2857 assert(method->is_method_handle_intrinsic() ||
2858 method->has_native_function(), "must have something valid to call!");
2859
2860 if (CriticalJNINatives && !method->is_method_handle_intrinsic()) {
2861 // We perform the I/O with transition to native before acquiring AdapterHandlerLibrary_lock.
2862 critical_entry = NativeLookup::lookup_critical_entry(method);
2863 }
2864
2865 {
2866 // Perform the work while holding the lock, but perform any printing outside the lock
2867 MutexLocker mu(AdapterHandlerLibrary_lock);
2868 // See if somebody beat us to it
2869 if (method->code() != NULL) {
2870 return;
2871 }
2872
2873 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci);
2874 assert(compile_id > 0, "Must generate native wrapper");
2875
2876
2877 ResourceMark rm;
2878 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2879 if (buf != NULL) {
2880 CodeBuffer buffer(buf);
2881 double locs_buf[20];
2882 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2883 MacroAssembler _masm(&buffer);
2884
2885 // Fill in the signature array, for the calling-convention call.
2886 const int total_args_passed = method->size_of_parameters();
2887
2888 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2889 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2890 int i=0;
2891 if (!method->is_static()) // Pass in receiver first
2892 sig_bt[i++] = T_OBJECT;
2893 SignatureStream ss(method->signature());
2894 for (; !ss.at_return_type(); ss.next()) {
2895 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2896 if (ss.type() == T_LONG || ss.type() == T_DOUBLE)
2897 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2898 }
2899 assert(i == total_args_passed, "");
2900 BasicType ret_type = ss.type();
2901
2902 // Now get the compiled-Java layout as input (or output) arguments.
2903 // NOTE: Stubs for compiled entry points of method handle intrinsics
2904 // are just trampolines so the argument registers must be outgoing ones.
2905 const bool is_outgoing = method->is_method_handle_intrinsic();
2906 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, is_outgoing);
2907
2908 // Generate the compiled-to-native wrapper code
2909 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type, critical_entry);
2910
2911 if (nm != NULL) {
2912 method->set_code(method, nm);
2913
2914 DirectiveSet* directive = DirectivesStack::getDefaultDirective(CompileBroker::compiler(CompLevel_simple));
2915 if (directive->PrintAssemblyOption) {
2916 nm->print_code();
2917 }
2918 DirectivesStack::release(directive);
2919 }
2920 }
2921 } // Unlock AdapterHandlerLibrary_lock
2922
2923
2924 // Install the generated code.
2925 if (nm != NULL) {
2926 const char *msg = method->is_static() ? "(static)" : "";
2927 CompileTask::print_ul(nm, msg);
2928 if (PrintCompilation) {
2929 ttyLocker ttyl;
2930 CompileTask::print(tty, nm, msg);
2931 }
2932 nm->post_compiled_method_load_event();
2933 }
2934 }
2935
2936 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::block_for_jni_critical(JavaThread* thread))
2937 assert(thread == JavaThread::current(), "must be");
2938 // The code is about to enter a JNI lazy critical native method and
2939 // _needs_gc is true, so if this thread is already in a critical
2940 // section then just return, otherwise this thread should block
2941 // until needs_gc has been cleared.
2942 if (thread->in_critical()) {
2943 return;
2944 }
2945 // Lock and unlock a critical section to give the system a chance to block
2946 GCLocker::lock_critical(thread);
2947 GCLocker::unlock_critical(thread);
2948 JRT_END
2949
2950 JRT_LEAF(oopDesc*, SharedRuntime::pin_object(JavaThread* thread, oopDesc* obj))
2951 assert(Universe::heap()->supports_object_pinning(), "Why we are here?");
2952 assert(obj != NULL, "Should not be null");
2953 oop o(obj);
2954 o = Universe::heap()->pin_object(thread, o);
2955 assert(o != NULL, "Should not be null");
2956 return o;
2957 JRT_END
2958
2959 JRT_LEAF(void, SharedRuntime::unpin_object(JavaThread* thread, oopDesc* obj))
2960 assert(Universe::heap()->supports_object_pinning(), "Why we are here?");
2961 assert(obj != NULL, "Should not be null");
2962 oop o(obj);
2963 Universe::heap()->unpin_object(thread, o);
2964 JRT_END
2965
2966 // -------------------------------------------------------------------------
2967 // Java-Java calling convention
2968 // (what you use when Java calls Java)
2969
2970 //------------------------------name_for_receiver----------------------------------
2971 // For a given signature, return the VMReg for parameter 0.
2972 VMReg SharedRuntime::name_for_receiver() {
2973 VMRegPair regs;
2974 BasicType sig_bt = T_OBJECT;
2975 (void) java_calling_convention(&sig_bt, ®s, 1, true);
2976 // Return argument 0 register. In the LP64 build pointers
2977 // take 2 registers, but the VM wants only the 'main' name.
2978 return regs.first();
2979 }
2980
2981 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) {
2982 // This method is returning a data structure allocating as a
2983 // ResourceObject, so do not put any ResourceMarks in here.
2984 char *s = sig->as_C_string();
2985 int len = (int)strlen(s);
2986 s++; len--; // Skip opening paren
2987
2988 BasicType *sig_bt = NEW_RESOURCE_ARRAY(BasicType, 256);
2989 VMRegPair *regs = NEW_RESOURCE_ARRAY(VMRegPair, 256);
2990 int cnt = 0;
2991 if (has_receiver) {
2992 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature
2993 }
2994
2995 while (*s != ')') { // Find closing right paren
2996 switch (*s++) { // Switch on signature character
2997 case 'B': sig_bt[cnt++] = T_BYTE; break;
2998 case 'C': sig_bt[cnt++] = T_CHAR; break;
2999 case 'D': sig_bt[cnt++] = T_DOUBLE; sig_bt[cnt++] = T_VOID; break;
3000 case 'F': sig_bt[cnt++] = T_FLOAT; break;
3001 case 'I': sig_bt[cnt++] = T_INT; break;
3002 case 'J': sig_bt[cnt++] = T_LONG; sig_bt[cnt++] = T_VOID; break;
3003 case 'S': sig_bt[cnt++] = T_SHORT; break;
3004 case 'Z': sig_bt[cnt++] = T_BOOLEAN; break;
3005 case 'V': sig_bt[cnt++] = T_VOID; break;
3006 case 'L': // Oop
3007 while (*s++ != ';'); // Skip signature
3008 sig_bt[cnt++] = T_OBJECT;
3009 break;
3010 case '[': { // Array
3011 do { // Skip optional size
3012 while (*s >= '0' && *s <= '9') s++;
3013 } while (*s++ == '['); // Nested arrays?
3014 // Skip element type
3015 if (s[-1] == 'L')
3016 while (*s++ != ';'); // Skip signature
3017 sig_bt[cnt++] = T_ARRAY;
3018 break;
3019 }
3020 default : ShouldNotReachHere();
3021 }
3022 }
3023
3024 if (has_appendix) {
3025 sig_bt[cnt++] = T_OBJECT;
3026 }
3027
3028 assert(cnt < 256, "grow table size");
3029
3030 int comp_args_on_stack;
3031 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true);
3032
3033 // the calling convention doesn't count out_preserve_stack_slots so
3034 // we must add that in to get "true" stack offsets.
3035
3036 if (comp_args_on_stack) {
3037 for (int i = 0; i < cnt; i++) {
3038 VMReg reg1 = regs[i].first();
3039 if (reg1->is_stack()) {
3040 // Yuck
3041 reg1 = reg1->bias(out_preserve_stack_slots());
3042 }
3043 VMReg reg2 = regs[i].second();
3044 if (reg2->is_stack()) {
3045 // Yuck
3046 reg2 = reg2->bias(out_preserve_stack_slots());
3047 }
3048 regs[i].set_pair(reg2, reg1);
3049 }
3050 }
3051
3052 // results
3053 *arg_size = cnt;
3054 return regs;
3055 }
3056
3057 // OSR Migration Code
3058 //
3059 // This code is used convert interpreter frames into compiled frames. It is
3060 // called from very start of a compiled OSR nmethod. A temp array is
3061 // allocated to hold the interesting bits of the interpreter frame. All
3062 // active locks are inflated to allow them to move. The displaced headers and
3063 // active interpreter locals are copied into the temp buffer. Then we return
3064 // back to the compiled code. The compiled code then pops the current
3065 // interpreter frame off the stack and pushes a new compiled frame. Then it
3066 // copies the interpreter locals and displaced headers where it wants.
3067 // Finally it calls back to free the temp buffer.
3068 //
3069 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed.
3070
3071 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) )
3072
3073 //
3074 // This code is dependent on the memory layout of the interpreter local
3075 // array and the monitors. On all of our platforms the layout is identical
3076 // so this code is shared. If some platform lays the their arrays out
3077 // differently then this code could move to platform specific code or
3078 // the code here could be modified to copy items one at a time using
3079 // frame accessor methods and be platform independent.
3080
3081 frame fr = thread->last_frame();
3082 assert(fr.is_interpreted_frame(), "");
3083 assert(fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks");
3084
3085 // Figure out how many monitors are active.
3086 int active_monitor_count = 0;
3087 for (BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
3088 kptr < fr.interpreter_frame_monitor_begin();
3089 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
3090 if (kptr->obj() != NULL) active_monitor_count++;
3091 }
3092
3093 // QQQ we could place number of active monitors in the array so that compiled code
3094 // could double check it.
3095
3096 Method* moop = fr.interpreter_frame_method();
3097 int max_locals = moop->max_locals();
3098 // Allocate temp buffer, 1 word per local & 2 per active monitor
3099 int buf_size_words = max_locals + active_monitor_count * BasicObjectLock::size();
3100 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode);
3101
3102 // Copy the locals. Order is preserved so that loading of longs works.
3103 // Since there's no GC I can copy the oops blindly.
3104 assert(sizeof(HeapWord)==sizeof(intptr_t), "fix this code");
3105 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
3106 (HeapWord*)&buf[0],
3107 max_locals);
3108
3109 // Inflate locks. Copy the displaced headers. Be careful, there can be holes.
3110 int i = max_locals;
3111 for (BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();
3112 kptr2 < fr.interpreter_frame_monitor_begin();
3113 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {
3114 if (kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array
3115 BasicLock *lock = kptr2->lock();
3116 // Disallow async deflation of the inflated monitor so the
3117 // displaced header stays stable until we've copied it.
3118 ObjectMonitorHandle omh;
3119 // Inflate so the displaced header becomes position-independent
3120 if (lock->displaced_header().is_unlocked()) {
3121 ObjectSynchronizer::inflate_helper(&omh, kptr2->obj());
3122 }
3123 // Now the displaced header is free to move
3124 buf[i++] = (intptr_t)lock->displaced_header().value();
3125 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj());
3126 }
3127 }
3128 assert(i - max_locals == active_monitor_count*2, "found the expected number of monitors");
3129
3130 return buf;
3131 JRT_END
3132
3133 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) )
3134 FREE_C_HEAP_ARRAY(intptr_t, buf);
3135 JRT_END
3136
3137 bool AdapterHandlerLibrary::contains(const CodeBlob* b) {
3138 AdapterHandlerTableIterator iter(_adapters);
3139 while (iter.has_next()) {
3140 AdapterHandlerEntry* a = iter.next();
3141 if (b == CodeCache::find_blob(a->get_i2c_entry())) return true;
3142 }
3143 return false;
3144 }
3145
3146 void AdapterHandlerLibrary::print_handler_on(outputStream* st, const CodeBlob* b) {
3147 AdapterHandlerTableIterator iter(_adapters);
3148 while (iter.has_next()) {
3149 AdapterHandlerEntry* a = iter.next();
3150 if (b == CodeCache::find_blob(a->get_i2c_entry())) {
3151 st->print("Adapter for signature: ");
3152 a->print_adapter_on(tty);
3153 return;
3154 }
3155 }
3156 assert(false, "Should have found handler");
3157 }
3158
3159 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
3160 st->print("AHE@" INTPTR_FORMAT ": %s", p2i(this), fingerprint()->as_string());
3161 if (get_i2c_entry() != NULL) {
3162 st->print(" i2c: " INTPTR_FORMAT, p2i(get_i2c_entry()));
3163 }
3164 if (get_c2i_entry() != NULL) {
3165 st->print(" c2i: " INTPTR_FORMAT, p2i(get_c2i_entry()));
3166 }
3167 if (get_c2i_unverified_entry() != NULL) {
3168 st->print(" c2iUV: " INTPTR_FORMAT, p2i(get_c2i_unverified_entry()));
3169 }
3170 if (get_c2i_no_clinit_check_entry() != NULL) {
3171 st->print(" c2iNCI: " INTPTR_FORMAT, p2i(get_c2i_no_clinit_check_entry()));
3172 }
3173 st->cr();
3174 }
3175
3176 #if INCLUDE_CDS
3177
3178 void CDSAdapterHandlerEntry::init() {
3179 assert(DumpSharedSpaces, "used during dump time only");
3180 _c2i_entry_trampoline = (address)MetaspaceShared::misc_code_space_alloc(SharedRuntime::trampoline_size());
3181 _adapter_trampoline = (AdapterHandlerEntry**)MetaspaceShared::misc_code_space_alloc(sizeof(AdapterHandlerEntry*));
3182 };
3183
3184 #endif // INCLUDE_CDS
3185
3186
3187 #ifndef PRODUCT
3188
3189 void AdapterHandlerLibrary::print_statistics() {
3190 _adapters->print_statistics();
3191 }
3192
3193 #endif /* PRODUCT */
3194
3195 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* thread))
3196 assert(thread->is_Java_thread(), "Only Java threads have a stack reserved zone");
3197 if (thread->stack_reserved_zone_disabled()) {
3198 thread->enable_stack_reserved_zone();
3199 }
3200 thread->set_reserved_stack_activation(thread->stack_base());
3201 JRT_END
3202
3203 frame SharedRuntime::look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr) {
3204 ResourceMark rm(thread);
3205 frame activation;
3206 CompiledMethod* nm = NULL;
3207 int count = 1;
3208
3209 assert(fr.is_java_frame(), "Must start on Java frame");
3210
3211 while (true) {
3212 Method* method = NULL;
3213 bool found = false;
3214 if (fr.is_interpreted_frame()) {
3215 method = fr.interpreter_frame_method();
3216 if (method != NULL && method->has_reserved_stack_access()) {
3217 found = true;
3218 }
3219 } else {
3220 CodeBlob* cb = fr.cb();
3221 if (cb != NULL && cb->is_compiled()) {
3222 nm = cb->as_compiled_method();
3223 method = nm->method();
3224 // scope_desc_near() must be used, instead of scope_desc_at() because on
3225 // SPARC, the pcDesc can be on the delay slot after the call instruction.
3226 for (ScopeDesc *sd = nm->scope_desc_near(fr.pc()); sd != NULL; sd = sd->sender()) {
3227 method = sd->method();
3228 if (method != NULL && method->has_reserved_stack_access()) {
3229 found = true;
3230 }
3231 }
3232 }
3233 }
3234 if (found) {
3235 activation = fr;
3236 warning("Potentially dangerous stack overflow in "
3237 "ReservedStackAccess annotated method %s [%d]",
3238 method->name_and_sig_as_C_string(), count++);
3239 EventReservedStackActivation event;
3240 if (event.should_commit()) {
3241 event.set_method(method);
3242 event.commit();
3243 }
3244 }
3245 if (fr.is_first_java_frame()) {
3246 break;
3247 } else {
3248 fr = fr.java_sender();
3249 }
3250 }
3251 return activation;
3252 }
3253
3254 void SharedRuntime::on_slowpath_allocation_exit(JavaThread* thread) {
3255 // After any safepoint, just before going back to compiled code,
3256 // we inform the GC that we will be doing initializing writes to
3257 // this object in the future without emitting card-marks, so
3258 // GC may take any compensating steps.
3259
3260 oop new_obj = thread->vm_result();
3261 if (new_obj == NULL) return;
3262
3263 BarrierSet *bs = BarrierSet::barrier_set();
3264 bs->on_slowpath_allocation_exit(thread, new_obj);
3265 }