1 /*
2 * Copyright (c) 1997, 2015, 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 "classfile/stringTable.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/codeCache.hpp"
30 #include "code/compiledIC.hpp"
31 #include "code/codeCacheExtensions.hpp"
32 #include "code/scopeDesc.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/abstractCompiler.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/disassembler.hpp"
37 #include "gc/shared/gcLocker.inline.hpp"
38 #include "interpreter/interpreter.hpp"
39 #include "interpreter/interpreterRuntime.hpp"
40 #include "logging/log.hpp"
41 #include "memory/universe.inline.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "prims/forte.hpp"
44 #include "prims/jvmtiExport.hpp"
45 #include "prims/jvmtiRedefineClassesTrace.hpp"
46 #include "prims/methodHandles.hpp"
47 #include "prims/nativeLookup.hpp"
48 #include "runtime/arguments.hpp"
49 #include "runtime/atomic.inline.hpp"
50 #include "runtime/biasedLocking.hpp"
51 #include "runtime/compilationPolicy.hpp"
52 #include "runtime/handles.inline.hpp"
53 #include "runtime/init.hpp"
54 #include "runtime/interfaceSupport.hpp"
55 #include "runtime/javaCalls.hpp"
56 #include "runtime/sharedRuntime.hpp"
57 #include "runtime/stubRoutines.hpp"
58 #include "runtime/vframe.hpp"
59 #include "runtime/vframeArray.hpp"
60 #include "trace/tracing.hpp"
61 #include "utilities/copy.hpp"
62 #include "utilities/dtrace.hpp"
63 #include "utilities/events.hpp"
64 #include "utilities/hashtable.inline.hpp"
65 #include "utilities/macros.hpp"
66 #include "utilities/xmlstream.hpp"
67 #ifdef COMPILER1
68 #include "c1/c1_Runtime1.hpp"
69 #endif
70
71 // Shared stub locations
72 RuntimeStub* SharedRuntime::_wrong_method_blob;
73 RuntimeStub* SharedRuntime::_wrong_method_abstract_blob;
74 RuntimeStub* SharedRuntime::_ic_miss_blob;
75 RuntimeStub* SharedRuntime::_resolve_opt_virtual_call_blob;
76 RuntimeStub* SharedRuntime::_resolve_virtual_call_blob;
77 RuntimeStub* SharedRuntime::_resolve_static_call_blob;
78
79 DeoptimizationBlob* SharedRuntime::_deopt_blob;
80 SafepointBlob* SharedRuntime::_polling_page_vectors_safepoint_handler_blob;
81 SafepointBlob* SharedRuntime::_polling_page_safepoint_handler_blob;
82 SafepointBlob* SharedRuntime::_polling_page_return_handler_blob;
83
84 #ifdef COMPILER2
85 UncommonTrapBlob* SharedRuntime::_uncommon_trap_blob;
86 #endif // COMPILER2
87
88
89 //----------------------------generate_stubs-----------------------------------
90 void SharedRuntime::generate_stubs() {
91 _wrong_method_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method), "wrong_method_stub");
92 _wrong_method_abstract_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract), "wrong_method_abstract_stub");
93 _ic_miss_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss), "ic_miss_stub");
94 _resolve_opt_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C), "resolve_opt_virtual_call");
95 _resolve_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C), "resolve_virtual_call");
96 _resolve_static_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C), "resolve_static_call");
97
98 #if defined(COMPILER2) || INCLUDE_JVMCI
99 // Vectors are generated only by C2 and JVMCI.
100 bool support_wide = is_wide_vector(MaxVectorSize);
101 if (support_wide) {
102 _polling_page_vectors_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_VECTOR_LOOP);
103 }
104 #endif // COMPILER2 || INCLUDE_JVMCI
105 _polling_page_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_LOOP);
106 _polling_page_return_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_RETURN);
107
108 generate_deopt_blob();
109
110 #ifdef COMPILER2
111 generate_uncommon_trap_blob();
112 #endif // COMPILER2
113 }
114
115 #include <math.h>
116
117 // Implementation of SharedRuntime
118
119 #ifndef PRODUCT
120 // For statistics
121 int SharedRuntime::_ic_miss_ctr = 0;
122 int SharedRuntime::_wrong_method_ctr = 0;
123 int SharedRuntime::_resolve_static_ctr = 0;
124 int SharedRuntime::_resolve_virtual_ctr = 0;
125 int SharedRuntime::_resolve_opt_virtual_ctr = 0;
126 int SharedRuntime::_implicit_null_throws = 0;
127 int SharedRuntime::_implicit_div0_throws = 0;
128 int SharedRuntime::_throw_null_ctr = 0;
129
130 int SharedRuntime::_nof_normal_calls = 0;
131 int SharedRuntime::_nof_optimized_calls = 0;
132 int SharedRuntime::_nof_inlined_calls = 0;
133 int SharedRuntime::_nof_megamorphic_calls = 0;
134 int SharedRuntime::_nof_static_calls = 0;
135 int SharedRuntime::_nof_inlined_static_calls = 0;
136 int SharedRuntime::_nof_interface_calls = 0;
137 int SharedRuntime::_nof_optimized_interface_calls = 0;
138 int SharedRuntime::_nof_inlined_interface_calls = 0;
139 int SharedRuntime::_nof_megamorphic_interface_calls = 0;
140 int SharedRuntime::_nof_removable_exceptions = 0;
141
142 int SharedRuntime::_new_instance_ctr=0;
143 int SharedRuntime::_new_array_ctr=0;
144 int SharedRuntime::_multi1_ctr=0;
145 int SharedRuntime::_multi2_ctr=0;
146 int SharedRuntime::_multi3_ctr=0;
147 int SharedRuntime::_multi4_ctr=0;
148 int SharedRuntime::_multi5_ctr=0;
149 int SharedRuntime::_mon_enter_stub_ctr=0;
150 int SharedRuntime::_mon_exit_stub_ctr=0;
151 int SharedRuntime::_mon_enter_ctr=0;
152 int SharedRuntime::_mon_exit_ctr=0;
153 int SharedRuntime::_partial_subtype_ctr=0;
154 int SharedRuntime::_jbyte_array_copy_ctr=0;
155 int SharedRuntime::_jshort_array_copy_ctr=0;
156 int SharedRuntime::_jint_array_copy_ctr=0;
157 int SharedRuntime::_jlong_array_copy_ctr=0;
158 int SharedRuntime::_oop_array_copy_ctr=0;
159 int SharedRuntime::_checkcast_array_copy_ctr=0;
160 int SharedRuntime::_unsafe_array_copy_ctr=0;
161 int SharedRuntime::_generic_array_copy_ctr=0;
162 int SharedRuntime::_slow_array_copy_ctr=0;
163 int SharedRuntime::_find_handler_ctr=0;
164 int SharedRuntime::_rethrow_ctr=0;
165
166 int SharedRuntime::_ICmiss_index = 0;
167 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count];
168 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count];
169
170
171 void SharedRuntime::trace_ic_miss(address at) {
172 for (int i = 0; i < _ICmiss_index; i++) {
173 if (_ICmiss_at[i] == at) {
174 _ICmiss_count[i]++;
175 return;
176 }
177 }
178 int index = _ICmiss_index++;
179 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1;
180 _ICmiss_at[index] = at;
181 _ICmiss_count[index] = 1;
182 }
183
184 void SharedRuntime::print_ic_miss_histogram() {
185 if (ICMissHistogram) {
186 tty->print_cr("IC Miss Histogram:");
187 int tot_misses = 0;
188 for (int i = 0; i < _ICmiss_index; i++) {
189 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", p2i(_ICmiss_at[i]), _ICmiss_count[i]);
190 tot_misses += _ICmiss_count[i];
191 }
192 tty->print_cr("Total IC misses: %7d", tot_misses);
193 }
194 }
195 #endif // PRODUCT
196
197 #if INCLUDE_ALL_GCS
198
199 // G1 write-barrier pre: executed before a pointer store.
200 JRT_LEAF(void, SharedRuntime::g1_wb_pre(oopDesc* orig, JavaThread *thread))
201 if (orig == NULL) {
202 assert(false, "should be optimized out");
203 return;
204 }
205 assert(orig->is_oop(true /* ignore mark word */), "Error");
206 // store the original value that was in the field reference
207 thread->satb_mark_queue().enqueue(orig);
208 JRT_END
209
210 // G1 write-barrier post: executed after a pointer store.
211 JRT_LEAF(void, SharedRuntime::g1_wb_post(void* card_addr, JavaThread* thread))
212 thread->dirty_card_queue().enqueue(card_addr);
213 JRT_END
214
215 #endif // INCLUDE_ALL_GCS
216
217
218 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x))
219 return x * y;
220 JRT_END
221
222
223 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x))
224 if (x == min_jlong && y == CONST64(-1)) {
225 return x;
226 } else {
227 return x / y;
228 }
229 JRT_END
230
231
232 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x))
233 if (x == min_jlong && y == CONST64(-1)) {
234 return 0;
235 } else {
236 return x % y;
237 }
238 JRT_END
239
240
241 const juint float_sign_mask = 0x7FFFFFFF;
242 const juint float_infinity = 0x7F800000;
243 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF);
244 const julong double_infinity = CONST64(0x7FF0000000000000);
245
246 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y))
247 #ifdef _WIN64
248 // 64-bit Windows on amd64 returns the wrong values for
249 // infinity operands.
250 union { jfloat f; juint i; } xbits, ybits;
251 xbits.f = x;
252 ybits.f = y;
253 // x Mod Infinity == x unless x is infinity
254 if (((xbits.i & float_sign_mask) != float_infinity) &&
255 ((ybits.i & float_sign_mask) == float_infinity) ) {
256 return x;
257 }
258 return ((jfloat)fmod_winx64((double)x, (double)y));
259 #else
260 return ((jfloat)fmod((double)x,(double)y));
261 #endif
262 JRT_END
263
264
265 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y))
266 #ifdef _WIN64
267 union { jdouble d; julong l; } xbits, ybits;
268 xbits.d = x;
269 ybits.d = y;
270 // x Mod Infinity == x unless x is infinity
271 if (((xbits.l & double_sign_mask) != double_infinity) &&
272 ((ybits.l & double_sign_mask) == double_infinity) ) {
273 return x;
274 }
275 return ((jdouble)fmod_winx64((double)x, (double)y));
276 #else
277 return ((jdouble)fmod((double)x,(double)y));
278 #endif
279 JRT_END
280
281 #ifdef __SOFTFP__
282 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y))
283 return x + y;
284 JRT_END
285
286 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y))
287 return x - y;
288 JRT_END
289
290 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y))
291 return x * y;
292 JRT_END
293
294 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y))
295 return x / y;
296 JRT_END
297
298 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y))
299 return x + y;
300 JRT_END
301
302 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y))
303 return x - y;
304 JRT_END
305
306 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y))
307 return x * y;
308 JRT_END
309
310 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y))
311 return x / y;
312 JRT_END
313
314 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x))
315 return (jfloat)x;
316 JRT_END
317
318 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x))
319 return (jdouble)x;
320 JRT_END
321
322 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x))
323 return (jdouble)x;
324 JRT_END
325
326 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y))
327 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/
328 JRT_END
329
330 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y))
331 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
332 JRT_END
333
334 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y))
335 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */
336 JRT_END
337
338 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y))
339 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
340 JRT_END
341
342 // Functions to return the opposite of the aeabi functions for nan.
343 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(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_dcmplt(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_fcmple(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_dcmple(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_fcmpge(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_dcmpge(double x, double y))
364 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
365 JRT_END
366
367 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y))
368 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
369 JRT_END
370
371 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y))
372 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
373 JRT_END
374
375 // Intrinsics make gcc generate code for these.
376 float SharedRuntime::fneg(float f) {
377 return -f;
378 }
379
380 double SharedRuntime::dneg(double f) {
381 return -f;
382 }
383
384 #endif // __SOFTFP__
385
386 #if defined(__SOFTFP__) || defined(E500V2)
387 // Intrinsics make gcc generate code for these.
388 double SharedRuntime::dabs(double f) {
389 return (f <= (double)0.0) ? (double)0.0 - f : f;
390 }
391
392 #endif
393
394 #if defined(__SOFTFP__) || defined(PPC)
395 double SharedRuntime::dsqrt(double f) {
396 return sqrt(f);
397 }
398 #endif
399
400 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x))
401 if (g_isnan(x))
402 return 0;
403 if (x >= (jfloat) max_jint)
404 return max_jint;
405 if (x <= (jfloat) min_jint)
406 return min_jint;
407 return (jint) x;
408 JRT_END
409
410
411 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x))
412 if (g_isnan(x))
413 return 0;
414 if (x >= (jfloat) max_jlong)
415 return max_jlong;
416 if (x <= (jfloat) min_jlong)
417 return min_jlong;
418 return (jlong) x;
419 JRT_END
420
421
422 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x))
423 if (g_isnan(x))
424 return 0;
425 if (x >= (jdouble) max_jint)
426 return max_jint;
427 if (x <= (jdouble) min_jint)
428 return min_jint;
429 return (jint) x;
430 JRT_END
431
432
433 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x))
434 if (g_isnan(x))
435 return 0;
436 if (x >= (jdouble) max_jlong)
437 return max_jlong;
438 if (x <= (jdouble) min_jlong)
439 return min_jlong;
440 return (jlong) x;
441 JRT_END
442
443
444 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x))
445 return (jfloat)x;
446 JRT_END
447
448
449 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x))
450 return (jfloat)x;
451 JRT_END
452
453
454 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x))
455 return (jdouble)x;
456 JRT_END
457
458 // Exception handling across interpreter/compiler boundaries
459 //
460 // exception_handler_for_return_address(...) returns the continuation address.
461 // The continuation address is the entry point of the exception handler of the
462 // previous frame depending on the return address.
463
464 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* thread, address return_address) {
465 assert(frame::verify_return_pc(return_address), "must be a return address: " INTPTR_FORMAT, p2i(return_address));
466 assert(thread->frames_to_pop_failed_realloc() == 0 || Interpreter::contains(return_address), "missed frames to pop?");
467
468 // Reset method handle flag.
469 thread->set_is_method_handle_return(false);
470
471 #if INCLUDE_JVMCI
472 // JVMCI's ExceptionHandlerStub expects the thread local exception PC to be clear
473 // and other exception handler continuations do not read it
474 thread->set_exception_pc(NULL);
475 #endif
476
477 // The fastest case first
478 CodeBlob* blob = CodeCache::find_blob(return_address);
479 nmethod* nm = (blob != NULL) ? blob->as_nmethod_or_null() : NULL;
480 if (nm != NULL) {
481 // Set flag if return address is a method handle call site.
482 thread->set_is_method_handle_return(nm->is_method_handle_return(return_address));
483 // native nmethods don't have exception handlers
484 assert(!nm->is_native_method(), "no exception handler");
485 assert(nm->header_begin() != nm->exception_begin(), "no exception handler");
486 if (nm->is_deopt_pc(return_address)) {
487 // If we come here because of a stack overflow, the stack may be
488 // unguarded. Reguard the stack otherwise if we return to the
489 // deopt blob and the stack bang causes a stack overflow we
490 // crash.
491 bool guard_pages_enabled = thread->stack_guards_enabled();
492 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack();
493 if (thread->reserved_stack_activation() != thread->stack_base()) {
494 thread->set_reserved_stack_activation(thread->stack_base());
495 }
496 assert(guard_pages_enabled, "stack banging in deopt blob may cause crash");
497 return SharedRuntime::deopt_blob()->unpack_with_exception();
498 } else {
499 return nm->exception_begin();
500 }
501 }
502
503 // Entry code
504 if (StubRoutines::returns_to_call_stub(return_address)) {
505 return StubRoutines::catch_exception_entry();
506 }
507 // Interpreted code
508 if (Interpreter::contains(return_address)) {
509 return Interpreter::rethrow_exception_entry();
510 }
511
512 guarantee(blob == NULL || !blob->is_runtime_stub(), "caller should have skipped stub");
513 guarantee(!VtableStubs::contains(return_address), "NULL exceptions in vtables should have been handled already!");
514
515 #ifndef PRODUCT
516 { ResourceMark rm;
517 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", p2i(return_address));
518 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here");
519 tty->print_cr("b) other problem");
520 }
521 #endif // PRODUCT
522
523 ShouldNotReachHere();
524 return NULL;
525 }
526
527
528 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* thread, address return_address))
529 return raw_exception_handler_for_return_address(thread, return_address);
530 JRT_END
531
532
533 address SharedRuntime::get_poll_stub(address pc) {
534 address stub;
535 // Look up the code blob
536 CodeBlob *cb = CodeCache::find_blob(pc);
537
538 // Should be an nmethod
539 assert(cb && cb->is_nmethod(), "safepoint polling: pc must refer to an nmethod");
540
541 // Look up the relocation information
542 assert(((nmethod*)cb)->is_at_poll_or_poll_return(pc),
543 "safepoint polling: type must be poll");
544
545 #ifdef ASSERT
546 if (!((NativeInstruction*)pc)->is_safepoint_poll()) {
547 tty->print_cr("bad pc: " PTR_FORMAT, p2i(pc));
548 Disassembler::decode(cb);
549 fatal("Only polling locations are used for safepoint");
550 }
551 #endif
552
553 bool at_poll_return = ((nmethod*)cb)->is_at_poll_return(pc);
554 bool has_wide_vectors = ((nmethod*)cb)->has_wide_vectors();
555 if (at_poll_return) {
556 assert(SharedRuntime::polling_page_return_handler_blob() != NULL,
557 "polling page return stub not created yet");
558 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();
559 } else if (has_wide_vectors) {
560 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != NULL,
561 "polling page vectors safepoint stub not created yet");
562 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point();
563 } else {
564 assert(SharedRuntime::polling_page_safepoint_handler_blob() != NULL,
565 "polling page safepoint stub not created yet");
566 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point();
567 }
568 log_debug(safepoint)("... found polling page %s exception at pc = "
569 INTPTR_FORMAT ", stub =" INTPTR_FORMAT,
570 at_poll_return ? "return" : "loop",
571 (intptr_t)pc, (intptr_t)stub);
572 return stub;
573 }
574
575
576 oop SharedRuntime::retrieve_receiver( Symbol* sig, frame caller ) {
577 assert(caller.is_interpreted_frame(), "");
578 int args_size = ArgumentSizeComputer(sig).size() + 1;
579 assert(args_size <= caller.interpreter_frame_expression_stack_size(), "receiver must be on interpreter stack");
580 oop result = cast_to_oop(*caller.interpreter_frame_tos_at(args_size - 1));
581 assert(Universe::heap()->is_in(result) && result->is_oop(), "receiver must be an oop");
582 return result;
583 }
584
585
586 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception) {
587 if (JvmtiExport::can_post_on_exceptions()) {
588 vframeStream vfst(thread, true);
589 methodHandle method = methodHandle(thread, vfst.method());
590 address bcp = method()->bcp_from(vfst.bci());
591 JvmtiExport::post_exception_throw(thread, method(), bcp, h_exception());
592 }
593 Exceptions::_throw(thread, __FILE__, __LINE__, h_exception);
594 }
595
596 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message) {
597 Handle h_exception = Exceptions::new_exception(thread, name, message);
598 throw_and_post_jvmti_exception(thread, h_exception);
599 }
600
601 // The interpreter code to call this tracing function is only
602 // called/generated when TraceRedefineClasses has the right bits
603 // set. Since obsolete methods are never compiled, we don't have
604 // to modify the compilers to generate calls to this function.
605 //
606 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry(
607 JavaThread* thread, Method* method))
608 assert(RC_TRACE_IN_RANGE(0x00001000, 0x00002000), "wrong call");
609
610 if (method->is_obsolete()) {
611 // We are calling an obsolete method, but this is not necessarily
612 // an error. Our method could have been redefined just after we
613 // fetched the Method* from the constant pool.
614
615 // RC_TRACE macro has an embedded ResourceMark
616 RC_TRACE_WITH_THREAD(0x00001000, thread,
617 ("calling obsolete method '%s'",
618 method->name_and_sig_as_C_string()));
619 if (RC_TRACE_ENABLED(0x00002000)) {
620 // this option is provided to debug calls to obsolete methods
621 guarantee(false, "faulting at call to an obsolete method.");
622 }
623 }
624 return 0;
625 JRT_END
626
627 // ret_pc points into caller; we are returning caller's exception handler
628 // for given exception
629 address SharedRuntime::compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
630 bool force_unwind, bool top_frame_only) {
631 assert(nm != NULL, "must exist");
632 ResourceMark rm;
633
634 #if INCLUDE_JVMCI
635 if (nm->is_compiled_by_jvmci()) {
636 // lookup exception handler for this pc
637 int catch_pco = ret_pc - nm->code_begin();
638 ExceptionHandlerTable table(nm);
639 HandlerTableEntry *t = table.entry_for(catch_pco, -1, 0);
640 if (t != NULL) {
641 return nm->code_begin() + t->pco();
642 } else {
643 // there is no exception handler for this pc => deoptimize
644 nm->make_not_entrant();
645
646 // Use Deoptimization::deoptimize for all of its side-effects:
647 // revoking biases of monitors, gathering traps statistics, logging...
648 // it also patches the return pc but we do not care about that
649 // since we return a continuation to the deopt_blob below.
650 JavaThread* thread = JavaThread::current();
651 RegisterMap reg_map(thread, UseBiasedLocking);
652 frame runtime_frame = thread->last_frame();
653 frame caller_frame = runtime_frame.sender(®_map);
654 Deoptimization::deoptimize(thread, caller_frame, ®_map, Deoptimization::Reason_not_compiled_exception_handler);
655
656 return SharedRuntime::deopt_blob()->unpack_with_exception_in_tls();
657 }
658 }
659 #endif // INCLUDE_JVMCI
660
661 ScopeDesc* sd = nm->scope_desc_at(ret_pc);
662 // determine handler bci, if any
663 EXCEPTION_MARK;
664
665 int handler_bci = -1;
666 int scope_depth = 0;
667 if (!force_unwind) {
668 int bci = sd->bci();
669 bool recursive_exception = false;
670 do {
671 bool skip_scope_increment = false;
672 // exception handler lookup
673 KlassHandle ek (THREAD, exception->klass());
674 methodHandle mh(THREAD, sd->method());
675 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD);
676 if (HAS_PENDING_EXCEPTION) {
677 recursive_exception = true;
678 // We threw an exception while trying to find the exception handler.
679 // Transfer the new exception to the exception handle which will
680 // be set into thread local storage, and do another lookup for an
681 // exception handler for this exception, this time starting at the
682 // BCI of the exception handler which caused the exception to be
683 // thrown (bugs 4307310 and 4546590). Set "exception" reference
684 // argument to ensure that the correct exception is thrown (4870175).
685 exception = Handle(THREAD, PENDING_EXCEPTION);
686 CLEAR_PENDING_EXCEPTION;
687 if (handler_bci >= 0) {
688 bci = handler_bci;
689 handler_bci = -1;
690 skip_scope_increment = true;
691 }
692 }
693 else {
694 recursive_exception = false;
695 }
696 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) {
697 sd = sd->sender();
698 if (sd != NULL) {
699 bci = sd->bci();
700 }
701 ++scope_depth;
702 }
703 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != NULL));
704 }
705
706 // found handling method => lookup exception handler
707 int catch_pco = ret_pc - nm->code_begin();
708
709 ExceptionHandlerTable table(nm);
710 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth);
711 if (t == NULL && (nm->is_compiled_by_c1() || handler_bci != -1)) {
712 // Allow abbreviated catch tables. The idea is to allow a method
713 // to materialize its exceptions without committing to the exact
714 // routing of exceptions. In particular this is needed for adding
715 // a synthetic handler to unlock monitors when inlining
716 // synchronized methods since the unlock path isn't represented in
717 // the bytecodes.
718 t = table.entry_for(catch_pco, -1, 0);
719 }
720
721 #ifdef COMPILER1
722 if (t == NULL && nm->is_compiled_by_c1()) {
723 assert(nm->unwind_handler_begin() != NULL, "");
724 return nm->unwind_handler_begin();
725 }
726 #endif
727
728 if (t == NULL) {
729 ttyLocker ttyl;
730 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d", p2i(ret_pc), handler_bci);
731 tty->print_cr(" Exception:");
732 exception->print();
733 tty->cr();
734 tty->print_cr(" Compiled exception table :");
735 table.print();
736 nm->print_code();
737 guarantee(false, "missing exception handler");
738 return NULL;
739 }
740
741 return nm->code_begin() + t->pco();
742 }
743
744 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* thread))
745 // These errors occur only at call sites
746 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError());
747 JRT_END
748
749 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
750 // These errors occur only at call sites
751 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub");
752 JRT_END
753
754 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread))
755 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
756 JRT_END
757
758 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* thread))
759 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
760 JRT_END
761
762 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* thread))
763 // This entry point is effectively only used for NullPointerExceptions which occur at inline
764 // cache sites (when the callee activation is not yet set up) so we are at a call site
765 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
766 JRT_END
767
768 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread))
769 throw_StackOverflowError_common(thread, false);
770 JRT_END
771
772 JRT_ENTRY(void, SharedRuntime::throw_delayed_StackOverflowError(JavaThread* thread))
773 throw_StackOverflowError_common(thread, true);
774 JRT_END
775
776 void SharedRuntime::throw_StackOverflowError_common(JavaThread* thread, bool delayed) {
777 // We avoid using the normal exception construction in this case because
778 // it performs an upcall to Java, and we're already out of stack space.
779 Thread* THREAD = thread;
780 Klass* k = SystemDictionary::StackOverflowError_klass();
781 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK);
782 if (delayed) {
783 java_lang_Throwable::set_message(exception_oop,
784 Universe::delayed_stack_overflow_error_message());
785 }
786 Handle exception (thread, exception_oop);
787 if (StackTraceInThrowable) {
788 java_lang_Throwable::fill_in_stack_trace(exception);
789 }
790 // Increment counter for hs_err file reporting
791 Atomic::inc(&Exceptions::_stack_overflow_errors);
792 throw_and_post_jvmti_exception(thread, exception);
793 }
794
795 #if INCLUDE_JVMCI
796 address SharedRuntime::deoptimize_for_implicit_exception(JavaThread* thread, address pc, nmethod* nm, int deopt_reason) {
797 assert(deopt_reason > Deoptimization::Reason_none && deopt_reason < Deoptimization::Reason_LIMIT, "invalid deopt reason");
798 thread->set_jvmci_implicit_exception_pc(pc);
799 thread->set_pending_deoptimization(Deoptimization::make_trap_request((Deoptimization::DeoptReason)deopt_reason, Deoptimization::Action_reinterpret));
800 return (SharedRuntime::deopt_blob()->implicit_exception_uncommon_trap());
801 }
802 #endif // INCLUDE_JVMCI
803
804 address SharedRuntime::continuation_for_implicit_exception(JavaThread* thread,
805 address pc,
806 SharedRuntime::ImplicitExceptionKind exception_kind)
807 {
808 address target_pc = NULL;
809
810 if (Interpreter::contains(pc)) {
811 #ifdef CC_INTERP
812 // C++ interpreter doesn't throw implicit exceptions
813 ShouldNotReachHere();
814 #else
815 switch (exception_kind) {
816 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry();
817 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry();
818 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry();
819 default: ShouldNotReachHere();
820 }
821 #endif // !CC_INTERP
822 } else {
823 switch (exception_kind) {
824 case STACK_OVERFLOW: {
825 // Stack overflow only occurs upon frame setup; the callee is
826 // going to be unwound. Dispatch to a shared runtime stub
827 // which will cause the StackOverflowError to be fabricated
828 // and processed.
829 // Stack overflow should never occur during deoptimization:
830 // the compiled method bangs the stack by as much as the
831 // interpreter would need in case of a deoptimization. The
832 // deoptimization blob and uncommon trap blob bang the stack
833 // in a debug VM to verify the correctness of the compiled
834 // method stack banging.
835 assert(thread->deopt_mark() == NULL, "no stack overflow from deopt blob/uncommon trap");
836 Events::log_exception(thread, "StackOverflowError at " INTPTR_FORMAT, p2i(pc));
837 return StubRoutines::throw_StackOverflowError_entry();
838 }
839
840 case IMPLICIT_NULL: {
841 if (VtableStubs::contains(pc)) {
842 // We haven't yet entered the callee frame. Fabricate an
843 // exception and begin dispatching it in the caller. Since
844 // the caller was at a call site, it's safe to destroy all
845 // caller-saved registers, as these entry points do.
846 VtableStub* vt_stub = VtableStubs::stub_containing(pc);
847
848 // If vt_stub is NULL, then return NULL to signal handler to report the SEGV error.
849 if (vt_stub == NULL) return NULL;
850
851 if (vt_stub->is_abstract_method_error(pc)) {
852 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs");
853 Events::log_exception(thread, "AbstractMethodError at " INTPTR_FORMAT, p2i(pc));
854 return StubRoutines::throw_AbstractMethodError_entry();
855 } else {
856 Events::log_exception(thread, "NullPointerException at vtable entry " INTPTR_FORMAT, p2i(pc));
857 return StubRoutines::throw_NullPointerException_at_call_entry();
858 }
859 } else {
860 CodeBlob* cb = CodeCache::find_blob(pc);
861
862 // If code blob is NULL, then return NULL to signal handler to report the SEGV error.
863 if (cb == NULL) return NULL;
864
865 // Exception happened in CodeCache. Must be either:
866 // 1. Inline-cache check in C2I handler blob,
867 // 2. Inline-cache check in nmethod, or
868 // 3. Implicit null exception in nmethod
869
870 if (!cb->is_nmethod()) {
871 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob();
872 if (!is_in_blob) {
873 // Allow normal crash reporting to handle this
874 return NULL;
875 }
876 Events::log_exception(thread, "NullPointerException in code blob at " INTPTR_FORMAT, p2i(pc));
877 // There is no handler here, so we will simply unwind.
878 return StubRoutines::throw_NullPointerException_at_call_entry();
879 }
880
881 // Otherwise, it's an nmethod. Consult its exception handlers.
882 nmethod* nm = (nmethod*)cb;
883 if (nm->inlinecache_check_contains(pc)) {
884 // exception happened inside inline-cache check code
885 // => the nmethod is not yet active (i.e., the frame
886 // is not set up yet) => use return address pushed by
887 // caller => don't push another return address
888 Events::log_exception(thread, "NullPointerException in IC check " INTPTR_FORMAT, p2i(pc));
889 return StubRoutines::throw_NullPointerException_at_call_entry();
890 }
891
892 if (nm->method()->is_method_handle_intrinsic()) {
893 // exception happened inside MH dispatch code, similar to a vtable stub
894 Events::log_exception(thread, "NullPointerException in MH adapter " INTPTR_FORMAT, p2i(pc));
895 return StubRoutines::throw_NullPointerException_at_call_entry();
896 }
897
898 #ifndef PRODUCT
899 _implicit_null_throws++;
900 #endif
901 #if INCLUDE_JVMCI
902 if (nm->is_compiled_by_jvmci() && nm->pc_desc_at(pc) != NULL) {
903 // If there's no PcDesc then we'll die way down inside of
904 // deopt instead of just getting normal error reporting,
905 // so only go there if it will succeed.
906 return deoptimize_for_implicit_exception(thread, pc, nm, Deoptimization::Reason_null_check);
907 } else {
908 #endif // INCLUDE_JVMCI
909 assert (nm->is_nmethod(), "Expect nmethod");
910 target_pc = nm->continuation_for_implicit_exception(pc);
911 #if INCLUDE_JVMCI
912 }
913 #endif // INCLUDE_JVMCI
914 // If there's an unexpected fault, target_pc might be NULL,
915 // in which case we want to fall through into the normal
916 // error handling code.
917 }
918
919 break; // fall through
920 }
921
922
923 case IMPLICIT_DIVIDE_BY_ZERO: {
924 nmethod* nm = CodeCache::find_nmethod(pc);
925 guarantee(nm != NULL, "must have containing compiled method for implicit division-by-zero exceptions");
926 #ifndef PRODUCT
927 _implicit_div0_throws++;
928 #endif
929 #if INCLUDE_JVMCI
930 if (nm->is_compiled_by_jvmci() && nm->pc_desc_at(pc) != NULL) {
931 return deoptimize_for_implicit_exception(thread, pc, nm, Deoptimization::Reason_div0_check);
932 } else {
933 #endif // INCLUDE_JVMCI
934 target_pc = nm->continuation_for_implicit_exception(pc);
935 #if INCLUDE_JVMCI
936 }
937 #endif // INCLUDE_JVMCI
938 // If there's an unexpected fault, target_pc might be NULL,
939 // in which case we want to fall through into the normal
940 // error handling code.
941 break; // fall through
942 }
943
944 default: ShouldNotReachHere();
945 }
946
947 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind");
948
949 if (exception_kind == IMPLICIT_NULL) {
950 #ifndef PRODUCT
951 // for AbortVMOnException flag
952 Exceptions::debug_check_abort("java.lang.NullPointerException");
953 #endif //PRODUCT
954 Events::log_exception(thread, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
955 } else {
956 #ifndef PRODUCT
957 // for AbortVMOnException flag
958 Exceptions::debug_check_abort("java.lang.ArithmeticException");
959 #endif //PRODUCT
960 Events::log_exception(thread, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
961 }
962 return target_pc;
963 }
964
965 ShouldNotReachHere();
966 return NULL;
967 }
968
969
970 /**
971 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is
972 * installed in the native function entry of all native Java methods before
973 * they get linked to their actual native methods.
974 *
975 * \note
976 * This method actually never gets called! The reason is because
977 * the interpreter's native entries call NativeLookup::lookup() which
978 * throws the exception when the lookup fails. The exception is then
979 * caught and forwarded on the return from NativeLookup::lookup() call
980 * before the call to the native function. This might change in the future.
981 */
982 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...))
983 {
984 // We return a bad value here to make sure that the exception is
985 // forwarded before we look at the return value.
986 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badJNIHandle);
987 }
988 JNI_END
989
990 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
991 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
992 }
993
994
995 #ifndef PRODUCT
996 JRT_ENTRY(intptr_t, SharedRuntime::trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
997 const frame f = thread->last_frame();
998 assert(f.is_interpreted_frame(), "must be an interpreted frame");
999 #ifndef PRODUCT
1000 methodHandle mh(THREAD, f.interpreter_frame_method());
1001 BytecodeTracer::trace(mh, f.interpreter_frame_bcp(), tos, tos2);
1002 #endif // !PRODUCT
1003 return preserve_this_value;
1004 JRT_END
1005 #endif // !PRODUCT
1006
1007 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
1008 assert(obj->is_oop(), "must be a valid oop");
1009 #if INCLUDE_JVMCI
1010 // This removes the requirement for JVMCI compilers to emit code
1011 // performing a dynamic check that obj has a finalizer before
1012 // calling this routine. There should be no performance impact
1013 // for C1 since it emits a dynamic check. C2 and the interpreter
1014 // uses other runtime routines for registering finalizers.
1015 if (!obj->klass()->has_finalizer()) {
1016 return;
1017 }
1018 #endif // INCLUDE_JVMCI
1019 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
1020 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
1021 JRT_END
1022
1023
1024 jlong SharedRuntime::get_java_tid(Thread* thread) {
1025 if (thread != NULL) {
1026 if (thread->is_Java_thread()) {
1027 oop obj = ((JavaThread*)thread)->threadObj();
1028 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj);
1029 }
1030 }
1031 return 0;
1032 }
1033
1034 /**
1035 * This function ought to be a void function, but cannot be because
1036 * it gets turned into a tail-call on sparc, which runs into dtrace bug
1037 * 6254741. Once that is fixed we can remove the dummy return value.
1038 */
1039 int SharedRuntime::dtrace_object_alloc(oopDesc* o, int size) {
1040 return dtrace_object_alloc_base(Thread::current(), o, size);
1041 }
1042
1043 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size) {
1044 assert(DTraceAllocProbes, "wrong call");
1045 Klass* klass = o->klass();
1046 Symbol* name = klass->name();
1047 HOTSPOT_OBJECT_ALLOC(
1048 get_java_tid(thread),
1049 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize);
1050 return 0;
1051 }
1052
1053 JRT_LEAF(int, SharedRuntime::dtrace_method_entry(
1054 JavaThread* thread, Method* method))
1055 assert(DTraceMethodProbes, "wrong call");
1056 Symbol* kname = method->klass_name();
1057 Symbol* name = method->name();
1058 Symbol* sig = method->signature();
1059 HOTSPOT_METHOD_ENTRY(
1060 get_java_tid(thread),
1061 (char *) kname->bytes(), kname->utf8_length(),
1062 (char *) name->bytes(), name->utf8_length(),
1063 (char *) sig->bytes(), sig->utf8_length());
1064 return 0;
1065 JRT_END
1066
1067 JRT_LEAF(int, SharedRuntime::dtrace_method_exit(
1068 JavaThread* thread, Method* method))
1069 assert(DTraceMethodProbes, "wrong call");
1070 Symbol* kname = method->klass_name();
1071 Symbol* name = method->name();
1072 Symbol* sig = method->signature();
1073 HOTSPOT_METHOD_RETURN(
1074 get_java_tid(thread),
1075 (char *) kname->bytes(), kname->utf8_length(),
1076 (char *) name->bytes(), name->utf8_length(),
1077 (char *) sig->bytes(), sig->utf8_length());
1078 return 0;
1079 JRT_END
1080
1081
1082 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode)
1083 // for a call current in progress, i.e., arguments has been pushed on stack
1084 // put callee has not been invoked yet. Used by: resolve virtual/static,
1085 // vtable updates, etc. Caller frame must be compiled.
1086 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) {
1087 ResourceMark rm(THREAD);
1088
1089 // last java frame on stack (which includes native call frames)
1090 vframeStream vfst(thread, true); // Do not skip and javaCalls
1091
1092 return find_callee_info_helper(thread, vfst, bc, callinfo, THREAD);
1093 }
1094
1095 methodHandle SharedRuntime::extract_attached_method(vframeStream& vfst) {
1096 nmethod* caller_nm = vfst.nm();
1097
1098 nmethodLocker caller_lock(caller_nm);
1099
1100 address pc = vfst.frame_pc();
1101 { // Get call instruction under lock because another thread may be busy patching it.
1102 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1103 return caller_nm->attached_method_before_pc(pc);
1104 }
1105 return NULL;
1106 }
1107
1108 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
1109 // for a call current in progress, i.e., arguments has been pushed on stack
1110 // but callee has not been invoked yet. Caller frame must be compiled.
1111 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread,
1112 vframeStream& vfst,
1113 Bytecodes::Code& bc,
1114 CallInfo& callinfo, TRAPS) {
1115 Handle receiver;
1116 Handle nullHandle; //create a handy null handle for exception returns
1117
1118 assert(!vfst.at_end(), "Java frame must exist");
1119
1120 // Find caller and bci from vframe
1121 methodHandle caller(THREAD, vfst.method());
1122 int bci = vfst.bci();
1123
1124 Bytecode_invoke bytecode(caller, bci);
1125 int bytecode_index = bytecode.index();
1126
1127 methodHandle attached_method = extract_attached_method(vfst);
1128 if (attached_method.not_null()) {
1129 methodHandle callee = bytecode.static_target(CHECK_NH);
1130 vmIntrinsics::ID id = callee->intrinsic_id();
1131 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call,
1132 // it attaches statically resolved method to the call site.
1133 if (MethodHandles::is_signature_polymorphic(id) &&
1134 MethodHandles::is_signature_polymorphic_intrinsic(id)) {
1135 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id);
1136
1137 // Adjust invocation mode according to the attached method.
1138 switch (bc) {
1139 case Bytecodes::_invokeinterface:
1140 if (!attached_method->method_holder()->is_interface()) {
1141 bc = Bytecodes::_invokevirtual;
1142 }
1143 break;
1144 case Bytecodes::_invokehandle:
1145 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) {
1146 bc = attached_method->is_static() ? Bytecodes::_invokestatic
1147 : Bytecodes::_invokevirtual;
1148 }
1149 break;
1150 }
1151 }
1152 } else {
1153 bc = bytecode.invoke_code();
1154 }
1155
1156 bool has_receiver = bc != Bytecodes::_invokestatic &&
1157 bc != Bytecodes::_invokedynamic &&
1158 bc != Bytecodes::_invokehandle;
1159
1160 // Find receiver for non-static call
1161 if (has_receiver) {
1162 // This register map must be update since we need to find the receiver for
1163 // compiled frames. The receiver might be in a register.
1164 RegisterMap reg_map2(thread);
1165 frame stubFrame = thread->last_frame();
1166 // Caller-frame is a compiled frame
1167 frame callerFrame = stubFrame.sender(®_map2);
1168
1169 if (attached_method.is_null()) {
1170 methodHandle callee = bytecode.static_target(CHECK_NH);
1171 if (callee.is_null()) {
1172 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1173 }
1174 }
1175
1176 // Retrieve from a compiled argument list
1177 receiver = Handle(THREAD, callerFrame.retrieve_receiver(®_map2));
1178
1179 if (receiver.is_null()) {
1180 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1181 }
1182 }
1183
1184 assert(receiver.is_null() || receiver->is_oop(), "wrong receiver");
1185
1186 // Resolve method
1187 if (attached_method.not_null()) {
1188 // Parameterized by attached method.
1189 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, CHECK_NH);
1190 } else {
1191 // Parameterized by bytecode.
1192 constantPoolHandle constants(THREAD, caller->constants());
1193 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH);
1194 }
1195
1196 #ifdef ASSERT
1197 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1198 if (has_receiver) {
1199 assert(receiver.not_null(), "should have thrown exception");
1200 KlassHandle receiver_klass(THREAD, receiver->klass());
1201 Klass* rk = NULL;
1202 if (attached_method.not_null()) {
1203 // In case there's resolved method attached, use its holder during the check.
1204 rk = attached_method->method_holder();
1205 } else {
1206 // Klass is already loaded.
1207 constantPoolHandle constants(THREAD, caller->constants());
1208 rk = constants->klass_ref_at(bytecode_index, CHECK_NH);
1209 }
1210 KlassHandle static_receiver_klass(THREAD, rk);
1211 methodHandle callee = callinfo.selected_method();
1212 assert(receiver_klass->is_subtype_of(static_receiver_klass()),
1213 "actual receiver must be subclass of static receiver klass");
1214 if (receiver_klass->is_instance_klass()) {
1215 if (InstanceKlass::cast(receiver_klass())->is_not_initialized()) {
1216 tty->print_cr("ERROR: Klass not yet initialized!!");
1217 receiver_klass()->print();
1218 }
1219 assert(!InstanceKlass::cast(receiver_klass())->is_not_initialized(), "receiver_klass must be initialized");
1220 }
1221 }
1222 #endif
1223
1224 return receiver;
1225 }
1226
1227 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) {
1228 ResourceMark rm(THREAD);
1229 // We need first to check if any Java activations (compiled, interpreted)
1230 // exist on the stack since last JavaCall. If not, we need
1231 // to get the target method from the JavaCall wrapper.
1232 vframeStream vfst(thread, true); // Do not skip any javaCalls
1233 methodHandle callee_method;
1234 if (vfst.at_end()) {
1235 // No Java frames were found on stack since we did the JavaCall.
1236 // Hence the stack can only contain an entry_frame. We need to
1237 // find the target method from the stub frame.
1238 RegisterMap reg_map(thread, false);
1239 frame fr = thread->last_frame();
1240 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1241 fr = fr.sender(®_map);
1242 assert(fr.is_entry_frame(), "must be");
1243 // fr is now pointing to the entry frame.
1244 callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method());
1245 assert(fr.entry_frame_call_wrapper()->receiver() == NULL || !callee_method->is_static(), "non-null receiver for static call??");
1246 } else {
1247 Bytecodes::Code bc;
1248 CallInfo callinfo;
1249 find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle()));
1250 callee_method = callinfo.selected_method();
1251 }
1252 assert(callee_method()->is_method(), "must be");
1253 return callee_method;
1254 }
1255
1256 // Resolves a call.
1257 methodHandle SharedRuntime::resolve_helper(JavaThread *thread,
1258 bool is_virtual,
1259 bool is_optimized, TRAPS) {
1260 methodHandle callee_method;
1261 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1262 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
1263 int retry_count = 0;
1264 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() &&
1265 callee_method->method_holder() != SystemDictionary::Object_klass()) {
1266 // If has a pending exception then there is no need to re-try to
1267 // resolve this method.
1268 // If the method has been redefined, we need to try again.
1269 // Hack: we have no way to update the vtables of arrays, so don't
1270 // require that java.lang.Object has been updated.
1271
1272 // It is very unlikely that method is redefined more than 100 times
1273 // in the middle of resolve. If it is looping here more than 100 times
1274 // means then there could be a bug here.
1275 guarantee((retry_count++ < 100),
1276 "Could not resolve to latest version of redefined method");
1277 // method is redefined in the middle of resolve so re-try.
1278 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1279 }
1280 }
1281 return callee_method;
1282 }
1283
1284 // Resolves a call. The compilers generate code for calls that go here
1285 // and are patched with the real destination of the call.
1286 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread,
1287 bool is_virtual,
1288 bool is_optimized, TRAPS) {
1289
1290 ResourceMark rm(thread);
1291 RegisterMap cbl_map(thread, false);
1292 frame caller_frame = thread->last_frame().sender(&cbl_map);
1293
1294 CodeBlob* caller_cb = caller_frame.cb();
1295 guarantee(caller_cb != NULL && caller_cb->is_nmethod(), "must be called from nmethod");
1296 nmethod* caller_nm = caller_cb->as_nmethod_or_null();
1297
1298 // make sure caller is not getting deoptimized
1299 // and removed before we are done with it.
1300 // CLEANUP - with lazy deopt shouldn't need this lock
1301 nmethodLocker caller_lock(caller_nm);
1302
1303 // determine call info & receiver
1304 // note: a) receiver is NULL for static calls
1305 // b) an exception is thrown if receiver is NULL for non-static calls
1306 CallInfo call_info;
1307 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1308 Handle receiver = find_callee_info(thread, invoke_code,
1309 call_info, CHECK_(methodHandle()));
1310 methodHandle callee_method = call_info.selected_method();
1311
1312 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1313 (!is_virtual && invoke_code == Bytecodes::_invokespecial) ||
1314 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1315 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1316 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1317
1318 assert(caller_nm->is_alive(), "It should be alive");
1319
1320 #ifndef PRODUCT
1321 // tracing/debugging/statistics
1322 int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
1323 (is_virtual) ? (&_resolve_virtual_ctr) :
1324 (&_resolve_static_ctr);
1325 Atomic::inc(addr);
1326
1327 if (TraceCallFixup) {
1328 ResourceMark rm(thread);
1329 tty->print("resolving %s%s (%s) call to",
1330 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
1331 Bytecodes::name(invoke_code));
1332 callee_method->print_short_name(tty);
1333 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT,
1334 p2i(caller_frame.pc()), p2i(callee_method->code()));
1335 }
1336 #endif
1337
1338 // JSR 292 key invariant:
1339 // If the resolved method is a MethodHandle invoke target, the call
1340 // site must be a MethodHandle call site, because the lambda form might tail-call
1341 // leaving the stack in a state unknown to either caller or callee
1342 // TODO detune for now but we might need it again
1343 // assert(!callee_method->is_compiled_lambda_form() ||
1344 // caller_nm->is_method_handle_return(caller_frame.pc()), "must be MH call site");
1345
1346 // Compute entry points. This might require generation of C2I converter
1347 // frames, so we cannot be holding any locks here. Furthermore, the
1348 // computation of the entry points is independent of patching the call. We
1349 // always return the entry-point, but we only patch the stub if the call has
1350 // not been deoptimized. Return values: For a virtual call this is an
1351 // (cached_oop, destination address) pair. For a static call/optimized
1352 // virtual this is just a destination address.
1353
1354 StaticCallInfo static_call_info;
1355 CompiledICInfo virtual_call_info;
1356
1357 // Make sure the callee nmethod does not get deoptimized and removed before
1358 // we are done patching the code.
1359 nmethod* callee_nm = callee_method->code();
1360 if (callee_nm != NULL && !callee_nm->is_in_use()) {
1361 // Patch call site to C2I adapter if callee nmethod is deoptimized or unloaded.
1362 callee_nm = NULL;
1363 }
1364 nmethodLocker nl_callee(callee_nm);
1365 #ifdef ASSERT
1366 address dest_entry_point = callee_nm == NULL ? 0 : callee_nm->entry_point(); // used below
1367 #endif
1368
1369 if (is_virtual) {
1370 assert(receiver.not_null() || invoke_code == Bytecodes::_invokehandle, "sanity check");
1371 bool static_bound = call_info.resolved_method()->can_be_statically_bound();
1372 KlassHandle h_klass(THREAD, invoke_code == Bytecodes::_invokehandle ? NULL : receiver->klass());
1373 CompiledIC::compute_monomorphic_entry(callee_method, h_klass,
1374 is_optimized, static_bound, virtual_call_info,
1375 CHECK_(methodHandle()));
1376 } else {
1377 // static call
1378 CompiledStaticCall::compute_entry(callee_method, static_call_info);
1379 }
1380
1381 // grab lock, check for deoptimization and potentially patch caller
1382 {
1383 MutexLocker ml_patch(CompiledIC_lock);
1384
1385 // Lock blocks for safepoint during which both nmethods can change state.
1386
1387 // Now that we are ready to patch if the Method* was redefined then
1388 // don't update call site and let the caller retry.
1389 // Don't update call site if callee nmethod was unloaded or deoptimized.
1390 // Don't update call site if callee nmethod was replaced by an other nmethod
1391 // which may happen when multiply alive nmethod (tiered compilation)
1392 // will be supported.
1393 if (!callee_method->is_old() &&
1394 (callee_nm == NULL || callee_nm->is_in_use() && (callee_method->code() == callee_nm))) {
1395 #ifdef ASSERT
1396 // We must not try to patch to jump to an already unloaded method.
1397 if (dest_entry_point != 0) {
1398 CodeBlob* cb = CodeCache::find_blob(dest_entry_point);
1399 assert((cb != NULL) && cb->is_nmethod() && (((nmethod*)cb) == callee_nm),
1400 "should not call unloaded nmethod");
1401 }
1402 #endif
1403 if (is_virtual) {
1404 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1405 if (inline_cache->is_clean()) {
1406 inline_cache->set_to_monomorphic(virtual_call_info);
1407 }
1408 } else {
1409 CompiledStaticCall* ssc = compiledStaticCall_before(caller_frame.pc());
1410 if (ssc->is_clean()) ssc->set(static_call_info);
1411 }
1412 }
1413
1414 } // unlock CompiledIC_lock
1415
1416 return callee_method;
1417 }
1418
1419
1420 // Inline caches exist only in compiled code
1421 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread))
1422 #ifdef ASSERT
1423 RegisterMap reg_map(thread, false);
1424 frame stub_frame = thread->last_frame();
1425 assert(stub_frame.is_runtime_frame(), "sanity check");
1426 frame caller_frame = stub_frame.sender(®_map);
1427 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame");
1428 #endif /* ASSERT */
1429
1430 methodHandle callee_method;
1431 JRT_BLOCK
1432 callee_method = SharedRuntime::handle_ic_miss_helper(thread, CHECK_NULL);
1433 // Return Method* through TLS
1434 thread->set_vm_result_2(callee_method());
1435 JRT_BLOCK_END
1436 // return compiled code entry point after potential safepoints
1437 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1438 return callee_method->verified_code_entry();
1439 JRT_END
1440
1441
1442 // Handle call site that has been made non-entrant
1443 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread))
1444 // 6243940 We might end up in here if the callee is deoptimized
1445 // as we race to call it. We don't want to take a safepoint if
1446 // the caller was interpreted because the caller frame will look
1447 // interpreted to the stack walkers and arguments are now
1448 // "compiled" so it is much better to make this transition
1449 // invisible to the stack walking code. The i2c path will
1450 // place the callee method in the callee_target. It is stashed
1451 // there because if we try and find the callee by normal means a
1452 // safepoint is possible and have trouble gc'ing the compiled args.
1453 RegisterMap reg_map(thread, false);
1454 frame stub_frame = thread->last_frame();
1455 assert(stub_frame.is_runtime_frame(), "sanity check");
1456 frame caller_frame = stub_frame.sender(®_map);
1457
1458 if (caller_frame.is_interpreted_frame() ||
1459 caller_frame.is_entry_frame()) {
1460 Method* callee = thread->callee_target();
1461 guarantee(callee != NULL && callee->is_method(), "bad handshake");
1462 thread->set_vm_result_2(callee);
1463 thread->set_callee_target(NULL);
1464 return callee->get_c2i_entry();
1465 }
1466
1467 // Must be compiled to compiled path which is safe to stackwalk
1468 methodHandle callee_method;
1469 JRT_BLOCK
1470 // Force resolving of caller (if we called from compiled frame)
1471 callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_NULL);
1472 thread->set_vm_result_2(callee_method());
1473 JRT_BLOCK_END
1474 // return compiled code entry point after potential safepoints
1475 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1476 return callee_method->verified_code_entry();
1477 JRT_END
1478
1479 // Handle abstract method call
1480 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* thread))
1481 return StubRoutines::throw_AbstractMethodError_entry();
1482 JRT_END
1483
1484
1485 // resolve a static call and patch code
1486 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread ))
1487 methodHandle callee_method;
1488 JRT_BLOCK
1489 callee_method = SharedRuntime::resolve_helper(thread, false, false, CHECK_NULL);
1490 thread->set_vm_result_2(callee_method());
1491 JRT_BLOCK_END
1492 // return compiled code entry point after potential safepoints
1493 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1494 return callee_method->verified_code_entry();
1495 JRT_END
1496
1497
1498 // resolve virtual call and update inline cache to monomorphic
1499 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread ))
1500 methodHandle callee_method;
1501 JRT_BLOCK
1502 callee_method = SharedRuntime::resolve_helper(thread, true, false, CHECK_NULL);
1503 thread->set_vm_result_2(callee_method());
1504 JRT_BLOCK_END
1505 // return compiled code entry point after potential safepoints
1506 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1507 return callee_method->verified_code_entry();
1508 JRT_END
1509
1510
1511 // Resolve a virtual call that can be statically bound (e.g., always
1512 // monomorphic, so it has no inline cache). Patch code to resolved target.
1513 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread))
1514 methodHandle callee_method;
1515 JRT_BLOCK
1516 callee_method = SharedRuntime::resolve_helper(thread, true, true, CHECK_NULL);
1517 thread->set_vm_result_2(callee_method());
1518 JRT_BLOCK_END
1519 // return compiled code entry point after potential safepoints
1520 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1521 return callee_method->verified_code_entry();
1522 JRT_END
1523
1524
1525 methodHandle SharedRuntime::handle_ic_miss_helper(JavaThread *thread, TRAPS) {
1526 ResourceMark rm(thread);
1527 CallInfo call_info;
1528 Bytecodes::Code bc;
1529
1530 // receiver is NULL for static calls. An exception is thrown for NULL
1531 // receivers for non-static calls
1532 Handle receiver = find_callee_info(thread, bc, call_info,
1533 CHECK_(methodHandle()));
1534 // Compiler1 can produce virtual call sites that can actually be statically bound
1535 // If we fell thru to below we would think that the site was going megamorphic
1536 // when in fact the site can never miss. Worse because we'd think it was megamorphic
1537 // we'd try and do a vtable dispatch however methods that can be statically bound
1538 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a
1539 // reresolution of the call site (as if we did a handle_wrong_method and not an
1540 // plain ic_miss) and the site will be converted to an optimized virtual call site
1541 // never to miss again. I don't believe C2 will produce code like this but if it
1542 // did this would still be the correct thing to do for it too, hence no ifdef.
1543 //
1544 if (call_info.resolved_method()->can_be_statically_bound()) {
1545 methodHandle callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_(methodHandle()));
1546 if (TraceCallFixup) {
1547 RegisterMap reg_map(thread, false);
1548 frame caller_frame = thread->last_frame().sender(®_map);
1549 ResourceMark rm(thread);
1550 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc));
1551 callee_method->print_short_name(tty);
1552 tty->print_cr(" from pc: " INTPTR_FORMAT, p2i(caller_frame.pc()));
1553 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1554 }
1555 return callee_method;
1556 }
1557
1558 methodHandle callee_method = call_info.selected_method();
1559
1560 bool should_be_mono = false;
1561
1562 #ifndef PRODUCT
1563 Atomic::inc(&_ic_miss_ctr);
1564
1565 // Statistics & Tracing
1566 if (TraceCallFixup) {
1567 ResourceMark rm(thread);
1568 tty->print("IC miss (%s) call to", Bytecodes::name(bc));
1569 callee_method->print_short_name(tty);
1570 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1571 }
1572
1573 if (ICMissHistogram) {
1574 MutexLocker m(VMStatistic_lock);
1575 RegisterMap reg_map(thread, false);
1576 frame f = thread->last_frame().real_sender(®_map);// skip runtime stub
1577 // produce statistics under the lock
1578 trace_ic_miss(f.pc());
1579 }
1580 #endif
1581
1582 // install an event collector so that when a vtable stub is created the
1583 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1584 // event can't be posted when the stub is created as locks are held
1585 // - instead the event will be deferred until the event collector goes
1586 // out of scope.
1587 JvmtiDynamicCodeEventCollector event_collector;
1588
1589 // Update inline cache to megamorphic. Skip update if we are called from interpreted.
1590 { MutexLocker ml_patch (CompiledIC_lock);
1591 RegisterMap reg_map(thread, false);
1592 frame caller_frame = thread->last_frame().sender(®_map);
1593 CodeBlob* cb = caller_frame.cb();
1594 if (cb->is_nmethod()) {
1595 CompiledIC* inline_cache = CompiledIC_before(((nmethod*)cb), caller_frame.pc());
1596 bool should_be_mono = false;
1597 if (inline_cache->is_optimized()) {
1598 if (TraceCallFixup) {
1599 ResourceMark rm(thread);
1600 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc));
1601 callee_method->print_short_name(tty);
1602 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1603 }
1604 should_be_mono = true;
1605 } else if (inline_cache->is_icholder_call()) {
1606 CompiledICHolder* ic_oop = inline_cache->cached_icholder();
1607 if (ic_oop != NULL) {
1608
1609 if (receiver()->klass() == ic_oop->holder_klass()) {
1610 // This isn't a real miss. We must have seen that compiled code
1611 // is now available and we want the call site converted to a
1612 // monomorphic compiled call site.
1613 // We can't assert for callee_method->code() != NULL because it
1614 // could have been deoptimized in the meantime
1615 if (TraceCallFixup) {
1616 ResourceMark rm(thread);
1617 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc));
1618 callee_method->print_short_name(tty);
1619 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1620 }
1621 should_be_mono = true;
1622 }
1623 }
1624 }
1625
1626 if (should_be_mono) {
1627
1628 // We have a path that was monomorphic but was going interpreted
1629 // and now we have (or had) a compiled entry. We correct the IC
1630 // by using a new icBuffer.
1631 CompiledICInfo info;
1632 KlassHandle receiver_klass(THREAD, receiver()->klass());
1633 inline_cache->compute_monomorphic_entry(callee_method,
1634 receiver_klass,
1635 inline_cache->is_optimized(),
1636 false,
1637 info, CHECK_(methodHandle()));
1638 inline_cache->set_to_monomorphic(info);
1639 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) {
1640 // Potential change to megamorphic
1641 bool successful = inline_cache->set_to_megamorphic(&call_info, bc, CHECK_(methodHandle()));
1642 if (!successful) {
1643 inline_cache->set_to_clean();
1644 }
1645 } else {
1646 // Either clean or megamorphic
1647 }
1648 } else {
1649 fatal("Unimplemented");
1650 }
1651 } // Release CompiledIC_lock
1652
1653 return callee_method;
1654 }
1655
1656 //
1657 // Resets a call-site in compiled code so it will get resolved again.
1658 // This routines handles both virtual call sites, optimized virtual call
1659 // sites, and static call sites. Typically used to change a call sites
1660 // destination from compiled to interpreted.
1661 //
1662 methodHandle SharedRuntime::reresolve_call_site(JavaThread *thread, TRAPS) {
1663 ResourceMark rm(thread);
1664 RegisterMap reg_map(thread, false);
1665 frame stub_frame = thread->last_frame();
1666 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1667 frame caller = stub_frame.sender(®_map);
1668
1669 // Do nothing if the frame isn't a live compiled frame.
1670 // nmethod could be deoptimized by the time we get here
1671 // so no update to the caller is needed.
1672
1673 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) {
1674
1675 address pc = caller.pc();
1676
1677 // Check for static or virtual call
1678 bool is_static_call = false;
1679 nmethod* caller_nm = CodeCache::find_nmethod(pc);
1680
1681 // Default call_addr is the location of the "basic" call.
1682 // Determine the address of the call we a reresolving. With
1683 // Inline Caches we will always find a recognizable call.
1684 // With Inline Caches disabled we may or may not find a
1685 // recognizable call. We will always find a call for static
1686 // calls and for optimized virtual calls. For vanilla virtual
1687 // calls it depends on the state of the UseInlineCaches switch.
1688 //
1689 // With Inline Caches disabled we can get here for a virtual call
1690 // for two reasons:
1691 // 1 - calling an abstract method. The vtable for abstract methods
1692 // will run us thru handle_wrong_method and we will eventually
1693 // end up in the interpreter to throw the ame.
1694 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1695 // call and between the time we fetch the entry address and
1696 // we jump to it the target gets deoptimized. Similar to 1
1697 // we will wind up in the interprter (thru a c2i with c2).
1698 //
1699 address call_addr = NULL;
1700 {
1701 // Get call instruction under lock because another thread may be
1702 // busy patching it.
1703 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1704 // Location of call instruction
1705 if (NativeCall::is_call_before(pc)) {
1706 NativeCall *ncall = nativeCall_before(pc);
1707 call_addr = ncall->instruction_address();
1708 }
1709 }
1710 // Make sure nmethod doesn't get deoptimized and removed until
1711 // this is done with it.
1712 // CLEANUP - with lazy deopt shouldn't need this lock
1713 nmethodLocker nmlock(caller_nm);
1714
1715 if (call_addr != NULL) {
1716 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1717 int ret = iter.next(); // Get item
1718 if (ret) {
1719 assert(iter.addr() == call_addr, "must find call");
1720 if (iter.type() == relocInfo::static_call_type) {
1721 is_static_call = true;
1722 } else {
1723 assert(iter.type() == relocInfo::virtual_call_type ||
1724 iter.type() == relocInfo::opt_virtual_call_type
1725 , "unexpected relocInfo. type");
1726 }
1727 } else {
1728 assert(!UseInlineCaches, "relocation info. must exist for this address");
1729 }
1730
1731 // Cleaning the inline cache will force a new resolve. This is more robust
1732 // than directly setting it to the new destination, since resolving of calls
1733 // is always done through the same code path. (experience shows that it
1734 // leads to very hard to track down bugs, if an inline cache gets updated
1735 // to a wrong method). It should not be performance critical, since the
1736 // resolve is only done once.
1737
1738 MutexLocker ml(CompiledIC_lock);
1739 if (is_static_call) {
1740 CompiledStaticCall* ssc= compiledStaticCall_at(call_addr);
1741 ssc->set_to_clean();
1742 } else {
1743 // compiled, dispatched call (which used to call an interpreted method)
1744 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1745 inline_cache->set_to_clean();
1746 }
1747 }
1748 }
1749
1750 methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle()));
1751
1752
1753 #ifndef PRODUCT
1754 Atomic::inc(&_wrong_method_ctr);
1755
1756 if (TraceCallFixup) {
1757 ResourceMark rm(thread);
1758 tty->print("handle_wrong_method reresolving call to");
1759 callee_method->print_short_name(tty);
1760 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1761 }
1762 #endif
1763
1764 return callee_method;
1765 }
1766
1767 #ifdef ASSERT
1768 void SharedRuntime::check_member_name_argument_is_last_argument(const methodHandle& method,
1769 const BasicType* sig_bt,
1770 const VMRegPair* regs) {
1771 ResourceMark rm;
1772 const int total_args_passed = method->size_of_parameters();
1773 const VMRegPair* regs_with_member_name = regs;
1774 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1);
1775
1776 const int member_arg_pos = total_args_passed - 1;
1777 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob");
1778 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object");
1779
1780 const bool is_outgoing = method->is_method_handle_intrinsic();
1781 int comp_args_on_stack = java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1, is_outgoing);
1782
1783 for (int i = 0; i < member_arg_pos; i++) {
1784 VMReg a = regs_with_member_name[i].first();
1785 VMReg b = regs_without_member_name[i].first();
1786 assert(a->value() == b->value(), "register allocation mismatch: a=" INTX_FORMAT ", b=" INTX_FORMAT, a->value(), b->value());
1787 }
1788 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg");
1789 }
1790 #endif
1791
1792 // ---------------------------------------------------------------------------
1793 // We are calling the interpreter via a c2i. Normally this would mean that
1794 // we were called by a compiled method. However we could have lost a race
1795 // where we went int -> i2c -> c2i and so the caller could in fact be
1796 // interpreted. If the caller is compiled we attempt to patch the caller
1797 // so he no longer calls into the interpreter.
1798 IRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc))
1799 Method* moop(method);
1800
1801 address entry_point = moop->from_compiled_entry();
1802
1803 // It's possible that deoptimization can occur at a call site which hasn't
1804 // been resolved yet, in which case this function will be called from
1805 // an nmethod that has been patched for deopt and we can ignore the
1806 // request for a fixup.
1807 // Also it is possible that we lost a race in that from_compiled_entry
1808 // is now back to the i2c in that case we don't need to patch and if
1809 // we did we'd leap into space because the callsite needs to use
1810 // "to interpreter" stub in order to load up the Method*. Don't
1811 // ask me how I know this...
1812
1813 CodeBlob* cb = CodeCache::find_blob(caller_pc);
1814 if (!cb->is_nmethod() || entry_point == moop->get_c2i_entry()) {
1815 return;
1816 }
1817
1818 // The check above makes sure this is a nmethod.
1819 nmethod* nm = cb->as_nmethod_or_null();
1820 assert(nm, "must be");
1821
1822 // Get the return PC for the passed caller PC.
1823 address return_pc = caller_pc + frame::pc_return_offset;
1824
1825 // There is a benign race here. We could be attempting to patch to a compiled
1826 // entry point at the same time the callee is being deoptimized. If that is
1827 // the case then entry_point may in fact point to a c2i and we'd patch the
1828 // call site with the same old data. clear_code will set code() to NULL
1829 // at the end of it. If we happen to see that NULL then we can skip trying
1830 // to patch. If we hit the window where the callee has a c2i in the
1831 // from_compiled_entry and the NULL isn't present yet then we lose the race
1832 // and patch the code with the same old data. Asi es la vida.
1833
1834 if (moop->code() == NULL) return;
1835
1836 if (nm->is_in_use()) {
1837
1838 // Expect to find a native call there (unless it was no-inline cache vtable dispatch)
1839 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1840 if (NativeCall::is_call_before(return_pc)) {
1841 NativeCall *call = nativeCall_before(return_pc);
1842 //
1843 // bug 6281185. We might get here after resolving a call site to a vanilla
1844 // virtual call. Because the resolvee uses the verified entry it may then
1845 // see compiled code and attempt to patch the site by calling us. This would
1846 // then incorrectly convert the call site to optimized and its downhill from
1847 // there. If you're lucky you'll get the assert in the bugid, if not you've
1848 // just made a call site that could be megamorphic into a monomorphic site
1849 // for the rest of its life! Just another racing bug in the life of
1850 // fixup_callers_callsite ...
1851 //
1852 RelocIterator iter(nm, call->instruction_address(), call->next_instruction_address());
1853 iter.next();
1854 assert(iter.has_current(), "must have a reloc at java call site");
1855 relocInfo::relocType typ = iter.reloc()->type();
1856 if (typ != relocInfo::static_call_type &&
1857 typ != relocInfo::opt_virtual_call_type &&
1858 typ != relocInfo::static_stub_type) {
1859 return;
1860 }
1861 address destination = call->destination();
1862 if (destination != entry_point) {
1863 CodeBlob* callee = CodeCache::find_blob(destination);
1864 // callee == cb seems weird. It means calling interpreter thru stub.
1865 if (callee == cb || callee->is_adapter_blob()) {
1866 // static call or optimized virtual
1867 if (TraceCallFixup) {
1868 tty->print("fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1869 moop->print_short_name(tty);
1870 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
1871 }
1872 call->set_destination_mt_safe(entry_point);
1873 } else {
1874 if (TraceCallFixup) {
1875 tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1876 moop->print_short_name(tty);
1877 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
1878 }
1879 // assert is too strong could also be resolve destinations.
1880 // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be");
1881 }
1882 } else {
1883 if (TraceCallFixup) {
1884 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1885 moop->print_short_name(tty);
1886 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
1887 }
1888 }
1889 }
1890 }
1891 IRT_END
1892
1893
1894 // same as JVM_Arraycopy, but called directly from compiled code
1895 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos,
1896 oopDesc* dest, jint dest_pos,
1897 jint length,
1898 JavaThread* thread)) {
1899 #ifndef PRODUCT
1900 _slow_array_copy_ctr++;
1901 #endif
1902 // Check if we have null pointers
1903 if (src == NULL || dest == NULL) {
1904 THROW(vmSymbols::java_lang_NullPointerException());
1905 }
1906 // Do the copy. The casts to arrayOop are necessary to the copy_array API,
1907 // even though the copy_array API also performs dynamic checks to ensure
1908 // that src and dest are truly arrays (and are conformable).
1909 // The copy_array mechanism is awkward and could be removed, but
1910 // the compilers don't call this function except as a last resort,
1911 // so it probably doesn't matter.
1912 src->klass()->copy_array((arrayOopDesc*)src, src_pos,
1913 (arrayOopDesc*)dest, dest_pos,
1914 length, thread);
1915 }
1916 JRT_END
1917
1918 char* SharedRuntime::generate_class_cast_message(
1919 JavaThread* thread, const char* objName) {
1920
1921 // Get target class name from the checkcast instruction
1922 vframeStream vfst(thread, true);
1923 assert(!vfst.at_end(), "Java frame must exist");
1924 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci()));
1925 Klass* targetKlass = vfst.method()->constants()->klass_at(
1926 cc.index(), thread);
1927 return generate_class_cast_message(objName, targetKlass->external_name());
1928 }
1929
1930 char* SharedRuntime::generate_class_cast_message(
1931 const char* objName, const char* targetKlassName, const char* desc) {
1932 size_t msglen = strlen(objName) + strlen(desc) + strlen(targetKlassName) + 1;
1933
1934 char* message = NEW_RESOURCE_ARRAY(char, msglen);
1935 if (NULL == message) {
1936 // Shouldn't happen, but don't cause even more problems if it does
1937 message = const_cast<char*>(objName);
1938 } else {
1939 jio_snprintf(message, msglen, "%s%s%s", objName, desc, targetKlassName);
1940 }
1941 return message;
1942 }
1943
1944 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
1945 (void) JavaThread::current()->reguard_stack();
1946 JRT_END
1947
1948
1949 // Handles the uncommon case in locking, i.e., contention or an inflated lock.
1950 JRT_BLOCK_ENTRY(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread))
1951 // Disable ObjectSynchronizer::quick_enter() in default config
1952 // until JDK-8077392 is resolved.
1953 if ((SyncFlags & 256) != 0 && !SafepointSynchronize::is_synchronizing()) {
1954 // Only try quick_enter() if we're not trying to reach a safepoint
1955 // so that the calling thread reaches the safepoint more quickly.
1956 if (ObjectSynchronizer::quick_enter(_obj, thread, lock)) return;
1957 }
1958 // NO_ASYNC required because an async exception on the state transition destructor
1959 // would leave you with the lock held and it would never be released.
1960 // The normal monitorenter NullPointerException is thrown without acquiring a lock
1961 // and the model is that an exception implies the method failed.
1962 JRT_BLOCK_NO_ASYNC
1963 oop obj(_obj);
1964 if (PrintBiasedLockingStatistics) {
1965 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
1966 }
1967 Handle h_obj(THREAD, obj);
1968 if (UseBiasedLocking) {
1969 // Retry fast entry if bias is revoked to avoid unnecessary inflation
1970 ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK);
1971 } else {
1972 ObjectSynchronizer::slow_enter(h_obj, lock, CHECK);
1973 }
1974 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
1975 JRT_BLOCK_END
1976 JRT_END
1977
1978 // Handles the uncommon cases of monitor unlocking in compiled code
1979 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock, JavaThread * THREAD))
1980 oop obj(_obj);
1981 assert(JavaThread::current() == THREAD, "invariant");
1982 // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore
1983 // testing was unable to ever fire the assert that guarded it so I have removed it.
1984 assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?");
1985 #undef MIGHT_HAVE_PENDING
1986 #ifdef MIGHT_HAVE_PENDING
1987 // Save and restore any pending_exception around the exception mark.
1988 // While the slow_exit must not throw an exception, we could come into
1989 // this routine with one set.
1990 oop pending_excep = NULL;
1991 const char* pending_file;
1992 int pending_line;
1993 if (HAS_PENDING_EXCEPTION) {
1994 pending_excep = PENDING_EXCEPTION;
1995 pending_file = THREAD->exception_file();
1996 pending_line = THREAD->exception_line();
1997 CLEAR_PENDING_EXCEPTION;
1998 }
1999 #endif /* MIGHT_HAVE_PENDING */
2000
2001 {
2002 // Exit must be non-blocking, and therefore no exceptions can be thrown.
2003 EXCEPTION_MARK;
2004 ObjectSynchronizer::slow_exit(obj, lock, THREAD);
2005 }
2006
2007 #ifdef MIGHT_HAVE_PENDING
2008 if (pending_excep != NULL) {
2009 THREAD->set_pending_exception(pending_excep, pending_file, pending_line);
2010 }
2011 #endif /* MIGHT_HAVE_PENDING */
2012 JRT_END
2013
2014 #ifndef PRODUCT
2015
2016 void SharedRuntime::print_statistics() {
2017 ttyLocker ttyl;
2018 if (xtty != NULL) xtty->head("statistics type='SharedRuntime'");
2019
2020 if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr);
2021
2022 SharedRuntime::print_ic_miss_histogram();
2023
2024 if (CountRemovableExceptions) {
2025 if (_nof_removable_exceptions > 0) {
2026 Unimplemented(); // this counter is not yet incremented
2027 tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions);
2028 }
2029 }
2030
2031 // Dump the JRT_ENTRY counters
2032 if (_new_instance_ctr) tty->print_cr("%5d new instance requires GC", _new_instance_ctr);
2033 if (_new_array_ctr) tty->print_cr("%5d new array requires GC", _new_array_ctr);
2034 if (_multi1_ctr) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr);
2035 if (_multi2_ctr) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr);
2036 if (_multi3_ctr) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr);
2037 if (_multi4_ctr) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr);
2038 if (_multi5_ctr) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr);
2039
2040 tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr);
2041 tty->print_cr("%5d wrong method", _wrong_method_ctr);
2042 tty->print_cr("%5d unresolved static call site", _resolve_static_ctr);
2043 tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr);
2044 tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr);
2045
2046 if (_mon_enter_stub_ctr) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr);
2047 if (_mon_exit_stub_ctr) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr);
2048 if (_mon_enter_ctr) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr);
2049 if (_mon_exit_ctr) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr);
2050 if (_partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr);
2051 if (_jbyte_array_copy_ctr) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr);
2052 if (_jshort_array_copy_ctr) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr);
2053 if (_jint_array_copy_ctr) tty->print_cr("%5d int array copies", _jint_array_copy_ctr);
2054 if (_jlong_array_copy_ctr) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr);
2055 if (_oop_array_copy_ctr) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr);
2056 if (_checkcast_array_copy_ctr) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr);
2057 if (_unsafe_array_copy_ctr) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr);
2058 if (_generic_array_copy_ctr) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr);
2059 if (_slow_array_copy_ctr) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr);
2060 if (_find_handler_ctr) tty->print_cr("%5d find exception handler", _find_handler_ctr);
2061 if (_rethrow_ctr) tty->print_cr("%5d rethrow handler", _rethrow_ctr);
2062
2063 AdapterHandlerLibrary::print_statistics();
2064
2065 if (xtty != NULL) xtty->tail("statistics");
2066 }
2067
2068 inline double percent(int x, int y) {
2069 return 100.0 * x / MAX2(y, 1);
2070 }
2071
2072 class MethodArityHistogram {
2073 public:
2074 enum { MAX_ARITY = 256 };
2075 private:
2076 static int _arity_histogram[MAX_ARITY]; // histogram of #args
2077 static int _size_histogram[MAX_ARITY]; // histogram of arg size in words
2078 static int _max_arity; // max. arity seen
2079 static int _max_size; // max. arg size seen
2080
2081 static void add_method_to_histogram(nmethod* nm) {
2082 Method* m = nm->method();
2083 ArgumentCount args(m->signature());
2084 int arity = args.size() + (m->is_static() ? 0 : 1);
2085 int argsize = m->size_of_parameters();
2086 arity = MIN2(arity, MAX_ARITY-1);
2087 argsize = MIN2(argsize, MAX_ARITY-1);
2088 int count = nm->method()->compiled_invocation_count();
2089 _arity_histogram[arity] += count;
2090 _size_histogram[argsize] += count;
2091 _max_arity = MAX2(_max_arity, arity);
2092 _max_size = MAX2(_max_size, argsize);
2093 }
2094
2095 void print_histogram_helper(int n, int* histo, const char* name) {
2096 const int N = MIN2(5, n);
2097 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2098 double sum = 0;
2099 double weighted_sum = 0;
2100 int i;
2101 for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; }
2102 double rest = sum;
2103 double percent = sum / 100;
2104 for (i = 0; i <= N; i++) {
2105 rest -= histo[i];
2106 tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent);
2107 }
2108 tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent);
2109 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n);
2110 }
2111
2112 void print_histogram() {
2113 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2114 print_histogram_helper(_max_arity, _arity_histogram, "arity");
2115 tty->print_cr("\nSame for parameter size (in words):");
2116 print_histogram_helper(_max_size, _size_histogram, "size");
2117 tty->cr();
2118 }
2119
2120 public:
2121 MethodArityHistogram() {
2122 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2123 _max_arity = _max_size = 0;
2124 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram[i] = 0;
2125 CodeCache::nmethods_do(add_method_to_histogram);
2126 print_histogram();
2127 }
2128 };
2129
2130 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY];
2131 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY];
2132 int MethodArityHistogram::_max_arity;
2133 int MethodArityHistogram::_max_size;
2134
2135 void SharedRuntime::print_call_statistics(int comp_total) {
2136 tty->print_cr("Calls from compiled code:");
2137 int total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls;
2138 int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls;
2139 int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls;
2140 tty->print_cr("\t%9d (%4.1f%%) total non-inlined ", total, percent(total, total));
2141 tty->print_cr("\t%9d (%4.1f%%) virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total));
2142 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls));
2143 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls));
2144 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_c, percent(mono_c, _nof_normal_calls));
2145 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls));
2146 tty->print_cr("\t%9d (%4.1f%%) interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total));
2147 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls));
2148 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls));
2149 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_i, percent(mono_i, _nof_interface_calls));
2150 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls));
2151 tty->print_cr("\t%9d (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total));
2152 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls));
2153 tty->cr();
2154 tty->print_cr("Note 1: counter updates are not MT-safe.");
2155 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
2156 tty->print_cr(" %% in nested categories are relative to their category");
2157 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
2158 tty->cr();
2159
2160 MethodArityHistogram h;
2161 }
2162 #endif
2163
2164
2165 // A simple wrapper class around the calling convention information
2166 // that allows sharing of adapters for the same calling convention.
2167 class AdapterFingerPrint : public CHeapObj<mtCode> {
2168 private:
2169 enum {
2170 _basic_type_bits = 4,
2171 _basic_type_mask = right_n_bits(_basic_type_bits),
2172 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2173 _compact_int_count = 3
2174 };
2175 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2176 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2177
2178 union {
2179 int _compact[_compact_int_count];
2180 int* _fingerprint;
2181 } _value;
2182 int _length; // A negative length indicates the fingerprint is in the compact form,
2183 // Otherwise _value._fingerprint is the array.
2184
2185 // Remap BasicTypes that are handled equivalently by the adapters.
2186 // These are correct for the current system but someday it might be
2187 // necessary to make this mapping platform dependent.
2188 static int adapter_encoding(BasicType in) {
2189 switch (in) {
2190 case T_BOOLEAN:
2191 case T_BYTE:
2192 case T_SHORT:
2193 case T_CHAR:
2194 // There are all promoted to T_INT in the calling convention
2195 return T_INT;
2196
2197 case T_OBJECT:
2198 case T_VALUETYPE:
2199 case T_ARRAY:
2200 // In other words, we assume that any register good enough for
2201 // an int or long is good enough for a managed pointer.
2202 #ifdef _LP64
2203 return T_LONG;
2204 #else
2205 return T_INT;
2206 #endif
2207
2208 case T_INT:
2209 case T_LONG:
2210 case T_FLOAT:
2211 case T_DOUBLE:
2212 case T_VOID:
2213 return in;
2214
2215 default:
2216 ShouldNotReachHere();
2217 return T_CONFLICT;
2218 }
2219 }
2220
2221 public:
2222 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) {
2223 // The fingerprint is based on the BasicType signature encoded
2224 // into an array of ints with eight entries per int.
2225 int* ptr;
2226 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int;
2227 if (len <= _compact_int_count) {
2228 assert(_compact_int_count == 3, "else change next line");
2229 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0;
2230 // Storing the signature encoded as signed chars hits about 98%
2231 // of the time.
2232 _length = -len;
2233 ptr = _value._compact;
2234 } else {
2235 _length = len;
2236 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode);
2237 ptr = _value._fingerprint;
2238 }
2239
2240 // Now pack the BasicTypes with 8 per int
2241 int sig_index = 0;
2242 for (int index = 0; index < len; index++) {
2243 int value = 0;
2244 for (int byte = 0; byte < _basic_types_per_int; byte++) {
2245 int bt = ((sig_index < total_args_passed)
2246 ? adapter_encoding(sig_bt[sig_index++])
2247 : 0);
2248 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits");
2249 value = (value << _basic_type_bits) | bt;
2250 }
2251 ptr[index] = value;
2252 }
2253 }
2254
2255 ~AdapterFingerPrint() {
2256 if (_length > 0) {
2257 FREE_C_HEAP_ARRAY(int, _value._fingerprint);
2258 }
2259 }
2260
2261 int value(int index) {
2262 if (_length < 0) {
2263 return _value._compact[index];
2264 }
2265 return _value._fingerprint[index];
2266 }
2267 int length() {
2268 if (_length < 0) return -_length;
2269 return _length;
2270 }
2271
2272 bool is_compact() {
2273 return _length <= 0;
2274 }
2275
2276 unsigned int compute_hash() {
2277 int hash = 0;
2278 for (int i = 0; i < length(); i++) {
2279 int v = value(i);
2280 hash = (hash << 8) ^ v ^ (hash >> 5);
2281 }
2282 return (unsigned int)hash;
2283 }
2284
2285 const char* as_string() {
2286 stringStream st;
2287 st.print("0x");
2288 for (int i = 0; i < length(); i++) {
2289 st.print("%08x", value(i));
2290 }
2291 return st.as_string();
2292 }
2293
2294 bool equals(AdapterFingerPrint* other) {
2295 if (other->_length != _length) {
2296 return false;
2297 }
2298 if (_length < 0) {
2299 assert(_compact_int_count == 3, "else change next line");
2300 return _value._compact[0] == other->_value._compact[0] &&
2301 _value._compact[1] == other->_value._compact[1] &&
2302 _value._compact[2] == other->_value._compact[2];
2303 } else {
2304 for (int i = 0; i < _length; i++) {
2305 if (_value._fingerprint[i] != other->_value._fingerprint[i]) {
2306 return false;
2307 }
2308 }
2309 }
2310 return true;
2311 }
2312 };
2313
2314
2315 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
2316 class AdapterHandlerTable : public BasicHashtable<mtCode> {
2317 friend class AdapterHandlerTableIterator;
2318
2319 private:
2320
2321 #ifndef PRODUCT
2322 static int _lookups; // number of calls to lookup
2323 static int _buckets; // number of buckets checked
2324 static int _equals; // number of buckets checked with matching hash
2325 static int _hits; // number of successful lookups
2326 static int _compact; // number of equals calls with compact signature
2327 #endif
2328
2329 AdapterHandlerEntry* bucket(int i) {
2330 return (AdapterHandlerEntry*)BasicHashtable<mtCode>::bucket(i);
2331 }
2332
2333 public:
2334 AdapterHandlerTable()
2335 : BasicHashtable<mtCode>(293, sizeof(AdapterHandlerEntry)) { }
2336
2337 // Create a new entry suitable for insertion in the table
2338 AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
2339 AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable<mtCode>::new_entry(fingerprint->compute_hash());
2340 entry->init(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
2341 return entry;
2342 }
2343
2344 // Insert an entry into the table
2345 void add(AdapterHandlerEntry* entry) {
2346 int index = hash_to_index(entry->hash());
2347 add_entry(index, entry);
2348 }
2349
2350 void free_entry(AdapterHandlerEntry* entry) {
2351 entry->deallocate();
2352 BasicHashtable<mtCode>::free_entry(entry);
2353 }
2354
2355 // Find a entry with the same fingerprint if it exists
2356 AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) {
2357 NOT_PRODUCT(_lookups++);
2358 AdapterFingerPrint fp(total_args_passed, sig_bt);
2359 unsigned int hash = fp.compute_hash();
2360 int index = hash_to_index(hash);
2361 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2362 NOT_PRODUCT(_buckets++);
2363 if (e->hash() == hash) {
2364 NOT_PRODUCT(_equals++);
2365 if (fp.equals(e->fingerprint())) {
2366 #ifndef PRODUCT
2367 if (fp.is_compact()) _compact++;
2368 _hits++;
2369 #endif
2370 return e;
2371 }
2372 }
2373 }
2374 return NULL;
2375 }
2376
2377 #ifndef PRODUCT
2378 void print_statistics() {
2379 ResourceMark rm;
2380 int longest = 0;
2381 int empty = 0;
2382 int total = 0;
2383 int nonempty = 0;
2384 for (int index = 0; index < table_size(); index++) {
2385 int count = 0;
2386 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2387 count++;
2388 }
2389 if (count != 0) nonempty++;
2390 if (count == 0) empty++;
2391 if (count > longest) longest = count;
2392 total += count;
2393 }
2394 tty->print_cr("AdapterHandlerTable: empty %d longest %d total %d average %f",
2395 empty, longest, total, total / (double)nonempty);
2396 tty->print_cr("AdapterHandlerTable: lookups %d buckets %d equals %d hits %d compact %d",
2397 _lookups, _buckets, _equals, _hits, _compact);
2398 }
2399 #endif
2400 };
2401
2402
2403 #ifndef PRODUCT
2404
2405 int AdapterHandlerTable::_lookups;
2406 int AdapterHandlerTable::_buckets;
2407 int AdapterHandlerTable::_equals;
2408 int AdapterHandlerTable::_hits;
2409 int AdapterHandlerTable::_compact;
2410
2411 #endif
2412
2413 class AdapterHandlerTableIterator : public StackObj {
2414 private:
2415 AdapterHandlerTable* _table;
2416 int _index;
2417 AdapterHandlerEntry* _current;
2418
2419 void scan() {
2420 while (_index < _table->table_size()) {
2421 AdapterHandlerEntry* a = _table->bucket(_index);
2422 _index++;
2423 if (a != NULL) {
2424 _current = a;
2425 return;
2426 }
2427 }
2428 }
2429
2430 public:
2431 AdapterHandlerTableIterator(AdapterHandlerTable* table): _table(table), _index(0), _current(NULL) {
2432 scan();
2433 }
2434 bool has_next() {
2435 return _current != NULL;
2436 }
2437 AdapterHandlerEntry* next() {
2438 if (_current != NULL) {
2439 AdapterHandlerEntry* result = _current;
2440 _current = _current->next();
2441 if (_current == NULL) scan();
2442 return result;
2443 } else {
2444 return NULL;
2445 }
2446 }
2447 };
2448
2449
2450 // ---------------------------------------------------------------------------
2451 // Implementation of AdapterHandlerLibrary
2452 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL;
2453 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL;
2454 const int AdapterHandlerLibrary_size = 16*K;
2455 BufferBlob* AdapterHandlerLibrary::_buffer = NULL;
2456
2457 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2458 // Should be called only when AdapterHandlerLibrary_lock is active.
2459 if (_buffer == NULL) // Initialize lazily
2460 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2461 return _buffer;
2462 }
2463
2464 extern "C" void unexpected_adapter_call() {
2465 ShouldNotCallThis();
2466 }
2467
2468 void AdapterHandlerLibrary::initialize() {
2469 if (_adapters != NULL) return;
2470 _adapters = new AdapterHandlerTable();
2471
2472 if (!CodeCacheExtensions::skip_compiler_support()) {
2473 // Create a special handler for abstract methods. Abstract methods
2474 // are never compiled so an i2c entry is somewhat meaningless, but
2475 // throw AbstractMethodError just in case.
2476 // Pass wrong_method_abstract for the c2i transitions to return
2477 // AbstractMethodError for invalid invocations.
2478 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
2479 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL),
2480 StubRoutines::throw_AbstractMethodError_entry(),
2481 wrong_method_abstract, wrong_method_abstract);
2482 } else {
2483 // Adapters are not supposed to be used.
2484 // Generate a special one to cause an error if used (and store this
2485 // singleton in place of the useless _abstract_method_error adapter).
2486 address entry = (address) &unexpected_adapter_call;
2487 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL),
2488 entry,
2489 entry,
2490 entry);
2491
2492 }
2493 }
2494
2495 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint,
2496 address i2c_entry,
2497 address c2i_entry,
2498 address c2i_unverified_entry) {
2499 return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
2500 }
2501
2502 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) {
2503 // Use customized signature handler. Need to lock around updates to
2504 // the AdapterHandlerTable (it is not safe for concurrent readers
2505 // and a single writer: this could be fixed if it becomes a
2506 // problem).
2507
2508 ResourceMark rm;
2509
2510 NOT_PRODUCT(int insts_size);
2511 AdapterBlob* new_adapter = NULL;
2512 AdapterHandlerEntry* entry = NULL;
2513 AdapterFingerPrint* fingerprint = NULL;
2514 {
2515 MutexLocker mu(AdapterHandlerLibrary_lock);
2516 // make sure data structure is initialized
2517 initialize();
2518
2519 if (CodeCacheExtensions::skip_compiler_support()) {
2520 // adapters are useless and should not be used, including the
2521 // abstract_method_handler. However, some callers check that
2522 // an adapter was installed.
2523 // Return the singleton adapter, stored into _abstract_method_handler
2524 // and modified to cause an error if we ever call it.
2525 return _abstract_method_handler;
2526 }
2527
2528 if (method->is_abstract()) {
2529 return _abstract_method_handler;
2530 }
2531
2532 // Fill in the signature array, for the calling-convention call.
2533 int total_args_passed = method->size_of_parameters(); // All args on stack
2534
2535 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2536 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2537 int i = 0;
2538 if (!method->is_static()) // Pass in receiver first
2539 sig_bt[i++] = T_OBJECT;
2540 for (SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) {
2541 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2542 if (ss.type() == T_LONG || ss.type() == T_DOUBLE)
2543 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2544 }
2545 assert(i == total_args_passed, "");
2546
2547 // Lookup method signature's fingerprint
2548 entry = _adapters->lookup(total_args_passed, sig_bt);
2549
2550 #ifdef ASSERT
2551 AdapterHandlerEntry* shared_entry = NULL;
2552 // Start adapter sharing verification only after the VM is booted.
2553 if (VerifyAdapterSharing && (entry != NULL)) {
2554 shared_entry = entry;
2555 entry = NULL;
2556 }
2557 #endif
2558
2559 if (entry != NULL) {
2560 return entry;
2561 }
2562
2563 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
2564 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false);
2565
2566 // Make a C heap allocated version of the fingerprint to store in the adapter
2567 fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt);
2568
2569 // StubRoutines::code2() is initialized after this function can be called. As a result,
2570 // VerifyAdapterCalls and VerifyAdapterSharing can fail if we re-use code that generated
2571 // prior to StubRoutines::code2() being set. Checks refer to checks generated in an I2C
2572 // stub that ensure that an I2C stub is called from an interpreter frame.
2573 bool contains_all_checks = StubRoutines::code2() != NULL;
2574
2575 // Create I2C & C2I handlers
2576 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2577 if (buf != NULL) {
2578 CodeBuffer buffer(buf);
2579 short buffer_locs[20];
2580 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
2581 sizeof(buffer_locs)/sizeof(relocInfo));
2582
2583 MacroAssembler _masm(&buffer);
2584 entry = SharedRuntime::generate_i2c2i_adapters(&_masm,
2585 total_args_passed,
2586 comp_args_on_stack,
2587 sig_bt,
2588 regs,
2589 fingerprint);
2590 #ifdef ASSERT
2591 if (VerifyAdapterSharing) {
2592 if (shared_entry != NULL) {
2593 assert(shared_entry->compare_code(buf->code_begin(), buffer.insts_size()), "code must match");
2594 // Release the one just created and return the original
2595 _adapters->free_entry(entry);
2596 return shared_entry;
2597 } else {
2598 entry->save_code(buf->code_begin(), buffer.insts_size());
2599 }
2600 }
2601 #endif
2602
2603 new_adapter = AdapterBlob::create(&buffer);
2604 NOT_PRODUCT(insts_size = buffer.insts_size());
2605 }
2606 if (new_adapter == NULL) {
2607 // CodeCache is full, disable compilation
2608 // Ought to log this but compile log is only per compile thread
2609 // and we're some non descript Java thread.
2610 return NULL; // Out of CodeCache space
2611 }
2612 entry->relocate(new_adapter->content_begin());
2613 #ifndef PRODUCT
2614 // debugging suppport
2615 if (PrintAdapterHandlers || PrintStubCode) {
2616 ttyLocker ttyl;
2617 entry->print_adapter_on(tty);
2618 tty->print_cr("i2c argument handler #%d for: %s %s %s (%d bytes generated)",
2619 _adapters->number_of_entries(), (method->is_static() ? "static" : "receiver"),
2620 method->signature()->as_C_string(), fingerprint->as_string(), insts_size);
2621 tty->print_cr("c2i argument handler starts at %p", entry->get_c2i_entry());
2622 if (Verbose || PrintStubCode) {
2623 address first_pc = entry->base_address();
2624 if (first_pc != NULL) {
2625 Disassembler::decode(first_pc, first_pc + insts_size);
2626 tty->cr();
2627 }
2628 }
2629 }
2630 #endif
2631 // Add the entry only if the entry contains all required checks (see sharedRuntime_xxx.cpp)
2632 // The checks are inserted only if -XX:+VerifyAdapterCalls is specified.
2633 if (contains_all_checks || !VerifyAdapterCalls) {
2634 _adapters->add(entry);
2635 }
2636 }
2637 // Outside of the lock
2638 if (new_adapter != NULL) {
2639 char blob_id[256];
2640 jio_snprintf(blob_id,
2641 sizeof(blob_id),
2642 "%s(%s)@" PTR_FORMAT,
2643 new_adapter->name(),
2644 fingerprint->as_string(),
2645 new_adapter->content_begin());
2646 Forte::register_stub(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2647
2648 if (JvmtiExport::should_post_dynamic_code_generated()) {
2649 JvmtiExport::post_dynamic_code_generated(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2650 }
2651 }
2652 return entry;
2653 }
2654
2655 address AdapterHandlerEntry::base_address() {
2656 address base = _i2c_entry;
2657 if (base == NULL) base = _c2i_entry;
2658 assert(base <= _c2i_entry || _c2i_entry == NULL, "");
2659 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == NULL, "");
2660 return base;
2661 }
2662
2663 void AdapterHandlerEntry::relocate(address new_base) {
2664 address old_base = base_address();
2665 assert(old_base != NULL, "");
2666 ptrdiff_t delta = new_base - old_base;
2667 if (_i2c_entry != NULL)
2668 _i2c_entry += delta;
2669 if (_c2i_entry != NULL)
2670 _c2i_entry += delta;
2671 if (_c2i_unverified_entry != NULL)
2672 _c2i_unverified_entry += delta;
2673 assert(base_address() == new_base, "");
2674 }
2675
2676
2677 void AdapterHandlerEntry::deallocate() {
2678 delete _fingerprint;
2679 #ifdef ASSERT
2680 if (_saved_code) FREE_C_HEAP_ARRAY(unsigned char, _saved_code);
2681 #endif
2682 }
2683
2684
2685 #ifdef ASSERT
2686 // Capture the code before relocation so that it can be compared
2687 // against other versions. If the code is captured after relocation
2688 // then relative instructions won't be equivalent.
2689 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
2690 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
2691 _saved_code_length = length;
2692 memcpy(_saved_code, buffer, length);
2693 }
2694
2695
2696 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length) {
2697 if (length != _saved_code_length) {
2698 return false;
2699 }
2700
2701 return (memcmp(buffer, _saved_code, length) == 0) ? true : false;
2702 }
2703 #endif
2704
2705
2706 /**
2707 * Create a native wrapper for this native method. The wrapper converts the
2708 * Java-compiled calling convention to the native convention, handles
2709 * arguments, and transitions to native. On return from the native we transition
2710 * back to java blocking if a safepoint is in progress.
2711 */
2712 void AdapterHandlerLibrary::create_native_wrapper(const methodHandle& method) {
2713 ResourceMark rm;
2714 nmethod* nm = NULL;
2715
2716 assert(method->is_native(), "must be native");
2717 assert(method->is_method_handle_intrinsic() ||
2718 method->has_native_function(), "must have something valid to call!");
2719
2720 {
2721 // Perform the work while holding the lock, but perform any printing outside the lock
2722 MutexLocker mu(AdapterHandlerLibrary_lock);
2723 // See if somebody beat us to it
2724 if (method->code() != NULL) {
2725 return;
2726 }
2727
2728 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci);
2729 assert(compile_id > 0, "Must generate native wrapper");
2730
2731
2732 ResourceMark rm;
2733 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2734 if (buf != NULL) {
2735 CodeBuffer buffer(buf);
2736 double locs_buf[20];
2737 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2738 MacroAssembler _masm(&buffer);
2739
2740 // Fill in the signature array, for the calling-convention call.
2741 const int total_args_passed = method->size_of_parameters();
2742
2743 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2744 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2745 int i=0;
2746 if (!method->is_static()) // Pass in receiver first
2747 sig_bt[i++] = T_OBJECT;
2748 SignatureStream ss(method->signature());
2749 for (; !ss.at_return_type(); ss.next()) {
2750 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2751 if (ss.type() == T_LONG || ss.type() == T_DOUBLE)
2752 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2753 }
2754 assert(i == total_args_passed, "");
2755 BasicType ret_type = ss.type();
2756
2757 // Now get the compiled-Java layout as input (or output) arguments.
2758 // NOTE: Stubs for compiled entry points of method handle intrinsics
2759 // are just trampolines so the argument registers must be outgoing ones.
2760 const bool is_outgoing = method->is_method_handle_intrinsic();
2761 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, is_outgoing);
2762
2763 // Generate the compiled-to-native wrapper code
2764 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type);
2765
2766 if (nm != NULL) {
2767 method->set_code(method, nm);
2768
2769 DirectiveSet* directive = DirectivesStack::getDefaultDirective(CompileBroker::compiler(CompLevel_simple));
2770 if (directive->PrintAssemblyOption) {
2771 nm->print_code();
2772 }
2773 DirectivesStack::release(directive);
2774 }
2775 }
2776 } // Unlock AdapterHandlerLibrary_lock
2777
2778
2779 // Install the generated code.
2780 if (nm != NULL) {
2781 if (PrintCompilation) {
2782 ttyLocker ttyl;
2783 CompileTask::print(tty, nm, method->is_static() ? "(static)" : "");
2784 }
2785 nm->post_compiled_method_load_event();
2786 }
2787 }
2788
2789 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::block_for_jni_critical(JavaThread* thread))
2790 assert(thread == JavaThread::current(), "must be");
2791 // The code is about to enter a JNI lazy critical native method and
2792 // _needs_gc is true, so if this thread is already in a critical
2793 // section then just return, otherwise this thread should block
2794 // until needs_gc has been cleared.
2795 if (thread->in_critical()) {
2796 return;
2797 }
2798 // Lock and unlock a critical section to give the system a chance to block
2799 GCLocker::lock_critical(thread);
2800 GCLocker::unlock_critical(thread);
2801 JRT_END
2802
2803 // -------------------------------------------------------------------------
2804 // Java-Java calling convention
2805 // (what you use when Java calls Java)
2806
2807 //------------------------------name_for_receiver----------------------------------
2808 // For a given signature, return the VMReg for parameter 0.
2809 VMReg SharedRuntime::name_for_receiver() {
2810 VMRegPair regs;
2811 BasicType sig_bt = T_OBJECT;
2812 (void) java_calling_convention(&sig_bt, ®s, 1, true);
2813 // Return argument 0 register. In the LP64 build pointers
2814 // take 2 registers, but the VM wants only the 'main' name.
2815 return regs.first();
2816 }
2817
2818 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) {
2819 // This method is returning a data structure allocating as a
2820 // ResourceObject, so do not put any ResourceMarks in here.
2821 char *s = sig->as_C_string();
2822 int len = (int)strlen(s);
2823 s++; len--; // Skip opening paren
2824 char *t = s+len;
2825 while (*(--t) != ')'); // Find close paren
2826
2827 BasicType *sig_bt = NEW_RESOURCE_ARRAY(BasicType, 256);
2828 VMRegPair *regs = NEW_RESOURCE_ARRAY(VMRegPair, 256);
2829 int cnt = 0;
2830 if (has_receiver) {
2831 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature
2832 }
2833
2834 while (s < t) {
2835 switch (*s++) { // Switch on signature character
2836 case 'B': sig_bt[cnt++] = T_BYTE; break;
2837 case 'C': sig_bt[cnt++] = T_CHAR; break;
2838 case 'D': sig_bt[cnt++] = T_DOUBLE; sig_bt[cnt++] = T_VOID; break;
2839 case 'F': sig_bt[cnt++] = T_FLOAT; break;
2840 case 'I': sig_bt[cnt++] = T_INT; break;
2841 case 'J': sig_bt[cnt++] = T_LONG; sig_bt[cnt++] = T_VOID; break;
2842 case 'S': sig_bt[cnt++] = T_SHORT; break;
2843 case 'Z': sig_bt[cnt++] = T_BOOLEAN; break;
2844 case 'V': sig_bt[cnt++] = T_VOID; break;
2845 case 'L': // Oop
2846 while (*s++ != ';'); // Skip signature
2847 sig_bt[cnt++] = T_OBJECT;
2848 break;
2849 case 'Q': // Oop
2850 while (*s++ != ';'); // Skip signature
2851 sig_bt[cnt++] = T_VALUETYPE;
2852 break;
2853 case '[': { // Array
2854 do { // Skip optional size
2855 while (*s >= '0' && *s <= '9') s++;
2856 } while (*s++ == '['); // Nested arrays?
2857 // Skip element type
2858 if (s[-1] == 'L')
2859 while (*s++ != ';'); // Skip signature
2860 sig_bt[cnt++] = T_ARRAY;
2861 break;
2862 }
2863 default : ShouldNotReachHere();
2864 }
2865 }
2866
2867 if (has_appendix) {
2868 sig_bt[cnt++] = T_OBJECT;
2869 }
2870
2871 assert(cnt < 256, "grow table size");
2872
2873 int comp_args_on_stack;
2874 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true);
2875
2876 // the calling convention doesn't count out_preserve_stack_slots so
2877 // we must add that in to get "true" stack offsets.
2878
2879 if (comp_args_on_stack) {
2880 for (int i = 0; i < cnt; i++) {
2881 VMReg reg1 = regs[i].first();
2882 if (reg1->is_stack()) {
2883 // Yuck
2884 reg1 = reg1->bias(out_preserve_stack_slots());
2885 }
2886 VMReg reg2 = regs[i].second();
2887 if (reg2->is_stack()) {
2888 // Yuck
2889 reg2 = reg2->bias(out_preserve_stack_slots());
2890 }
2891 regs[i].set_pair(reg2, reg1);
2892 }
2893 }
2894
2895 // results
2896 *arg_size = cnt;
2897 return regs;
2898 }
2899
2900 // OSR Migration Code
2901 //
2902 // This code is used convert interpreter frames into compiled frames. It is
2903 // called from very start of a compiled OSR nmethod. A temp array is
2904 // allocated to hold the interesting bits of the interpreter frame. All
2905 // active locks are inflated to allow them to move. The displaced headers and
2906 // active interpreter locals are copied into the temp buffer. Then we return
2907 // back to the compiled code. The compiled code then pops the current
2908 // interpreter frame off the stack and pushes a new compiled frame. Then it
2909 // copies the interpreter locals and displaced headers where it wants.
2910 // Finally it calls back to free the temp buffer.
2911 //
2912 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed.
2913
2914 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) )
2915
2916 //
2917 // This code is dependent on the memory layout of the interpreter local
2918 // array and the monitors. On all of our platforms the layout is identical
2919 // so this code is shared. If some platform lays the their arrays out
2920 // differently then this code could move to platform specific code or
2921 // the code here could be modified to copy items one at a time using
2922 // frame accessor methods and be platform independent.
2923
2924 frame fr = thread->last_frame();
2925 assert(fr.is_interpreted_frame(), "");
2926 assert(fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks");
2927
2928 // Figure out how many monitors are active.
2929 int active_monitor_count = 0;
2930 for (BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
2931 kptr < fr.interpreter_frame_monitor_begin();
2932 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
2933 if (kptr->obj() != NULL) active_monitor_count++;
2934 }
2935
2936 // QQQ we could place number of active monitors in the array so that compiled code
2937 // could double check it.
2938
2939 Method* moop = fr.interpreter_frame_method();
2940 int max_locals = moop->max_locals();
2941 // Allocate temp buffer, 1 word per local & 2 per active monitor
2942 int buf_size_words = max_locals + active_monitor_count*2;
2943 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode);
2944
2945 // Copy the locals. Order is preserved so that loading of longs works.
2946 // Since there's no GC I can copy the oops blindly.
2947 assert(sizeof(HeapWord)==sizeof(intptr_t), "fix this code");
2948 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
2949 (HeapWord*)&buf[0],
2950 max_locals);
2951
2952 // Inflate locks. Copy the displaced headers. Be careful, there can be holes.
2953 int i = max_locals;
2954 for (BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();
2955 kptr2 < fr.interpreter_frame_monitor_begin();
2956 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {
2957 if (kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array
2958 BasicLock *lock = kptr2->lock();
2959 // Inflate so the displaced header becomes position-independent
2960 if (lock->displaced_header()->is_unlocked())
2961 ObjectSynchronizer::inflate_helper(kptr2->obj());
2962 // Now the displaced header is free to move
2963 buf[i++] = (intptr_t)lock->displaced_header();
2964 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj());
2965 }
2966 }
2967 assert(i - max_locals == active_monitor_count*2, "found the expected number of monitors");
2968
2969 return buf;
2970 JRT_END
2971
2972 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) )
2973 FREE_C_HEAP_ARRAY(intptr_t, buf);
2974 JRT_END
2975
2976 bool AdapterHandlerLibrary::contains(const CodeBlob* b) {
2977 AdapterHandlerTableIterator iter(_adapters);
2978 while (iter.has_next()) {
2979 AdapterHandlerEntry* a = iter.next();
2980 if (b == CodeCache::find_blob(a->get_i2c_entry())) return true;
2981 }
2982 return false;
2983 }
2984
2985 void AdapterHandlerLibrary::print_handler_on(outputStream* st, const CodeBlob* b) {
2986 AdapterHandlerTableIterator iter(_adapters);
2987 while (iter.has_next()) {
2988 AdapterHandlerEntry* a = iter.next();
2989 if (b == CodeCache::find_blob(a->get_i2c_entry())) {
2990 st->print("Adapter for signature: ");
2991 a->print_adapter_on(tty);
2992 return;
2993 }
2994 }
2995 assert(false, "Should have found handler");
2996 }
2997
2998 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
2999 st->print_cr("AHE@" INTPTR_FORMAT ": %s i2c: " INTPTR_FORMAT " c2i: " INTPTR_FORMAT " c2iUV: " INTPTR_FORMAT,
3000 p2i(this), fingerprint()->as_string(),
3001 p2i(get_i2c_entry()), p2i(get_c2i_entry()), p2i(get_c2i_unverified_entry()));
3002
3003 }
3004
3005 #ifndef PRODUCT
3006
3007 void AdapterHandlerLibrary::print_statistics() {
3008 _adapters->print_statistics();
3009 }
3010
3011 #endif /* PRODUCT */
3012
3013 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* thread))
3014 assert(thread->is_Java_thread(), "Only Java threads have a stack reserved zone");
3015 thread->enable_stack_reserved_zone();
3016 thread->set_reserved_stack_activation(thread->stack_base());
3017 JRT_END
3018
3019 frame SharedRuntime::look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr) {
3020 frame activation;
3021 int decode_offset = 0;
3022 nmethod* nm = NULL;
3023 frame prv_fr = fr;
3024 int count = 1;
3025
3026 assert(fr.is_java_frame(), "Must start on Java frame");
3027
3028 while (!fr.is_first_frame()) {
3029 Method* method = NULL;
3030 // Compiled java method case.
3031 if (decode_offset != 0) {
3032 DebugInfoReadStream stream(nm, decode_offset);
3033 decode_offset = stream.read_int();
3034 method = (Method*)nm->metadata_at(stream.read_int());
3035 } else {
3036 if (fr.is_first_java_frame()) break;
3037 address pc = fr.pc();
3038 prv_fr = fr;
3039 if (fr.is_interpreted_frame()) {
3040 method = fr.interpreter_frame_method();
3041 fr = fr.java_sender();
3042 } else {
3043 CodeBlob* cb = fr.cb();
3044 fr = fr.java_sender();
3045 if (cb == NULL || !cb->is_nmethod()) {
3046 continue;
3047 }
3048 nm = (nmethod*)cb;
3049 if (nm->method()->is_native()) {
3050 method = nm->method();
3051 } else {
3052 PcDesc* pd = nm->pc_desc_at(pc);
3053 assert(pd != NULL, "PcDesc must not be NULL");
3054 decode_offset = pd->scope_decode_offset();
3055 // if decode_offset is not equal to 0, it will execute the
3056 // "compiled java method case" at the beginning of the loop.
3057 continue;
3058 }
3059 }
3060 }
3061 if (method->has_reserved_stack_access()) {
3062 ResourceMark rm(thread);
3063 activation = prv_fr;
3064 warning("Potentially dangerous stack overflow in "
3065 "ReservedStackAccess annotated method %s [%d]",
3066 method->name_and_sig_as_C_string(), count++);
3067 EventReservedStackActivation event;
3068 if (event.should_commit()) {
3069 event.set_method(method);
3070 event.commit();
3071 }
3072 }
3073 }
3074 return activation;
3075 }
3076