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