1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "aot/aotLoader.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "code/codeCache.hpp"
32 #include "code/compiledIC.hpp"
33 #include "code/icBuffer.hpp"
34 #include "code/compiledMethod.inline.hpp"
35 #include "code/scopeDesc.hpp"
36 #include "code/vtableStubs.hpp"
37 #include "compiler/abstractCompiler.hpp"
38 #include "compiler/compileBroker.hpp"
39 #include "compiler/disassembler.hpp"
40 #include "gc/shared/barrierSet.hpp"
41 #include "gc/shared/gcLocker.inline.hpp"
42 #include "interpreter/interpreter.hpp"
43 #include "interpreter/interpreterRuntime.hpp"
44 #include "jfr/jfrEvents.hpp"
45 #include "logging/log.hpp"
46 #include "memory/metaspaceShared.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "oops/access.hpp"
51 #include "oops/fieldStreams.hpp"
52 #include "oops/klass.hpp"
53 #include "oops/method.inline.hpp"
54 #include "oops/objArrayKlass.hpp"
55 #include "oops/objArrayOop.inline.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "oops/valueKlass.hpp"
58 #include "prims/forte.hpp"
59 #include "prims/jvmtiExport.hpp"
60 #include "prims/methodHandles.hpp"
61 #include "prims/nativeLookup.hpp"
62 #include "runtime/arguments.hpp"
63 #include "runtime/atomic.hpp"
64 #include "runtime/biasedLocking.hpp"
65 #include "runtime/compilationPolicy.hpp"
66 #include "runtime/frame.inline.hpp"
67 #include "runtime/handles.inline.hpp"
68 #include "runtime/init.hpp"
69 #include "runtime/interfaceSupport.inline.hpp"
70 #include "runtime/java.hpp"
71 #include "runtime/javaCalls.hpp"
72 #include "runtime/sharedRuntime.hpp"
73 #include "runtime/stubRoutines.hpp"
74 #include "runtime/vframe.inline.hpp"
75 #include "runtime/vframeArray.hpp"
76 #include "utilities/copy.hpp"
77 #include "utilities/dtrace.hpp"
78 #include "utilities/events.hpp"
79 #include "utilities/hashtable.inline.hpp"
80 #include "utilities/macros.hpp"
81 #include "utilities/xmlstream.hpp"
82 #ifdef COMPILER1
83 #include "c1/c1_Runtime1.hpp"
84 #endif
85
86 // Shared stub locations
87 RuntimeStub* SharedRuntime::_wrong_method_blob;
88 RuntimeStub* SharedRuntime::_wrong_method_abstract_blob;
89 RuntimeStub* SharedRuntime::_ic_miss_blob;
90 RuntimeStub* SharedRuntime::_resolve_opt_virtual_call_blob;
91 RuntimeStub* SharedRuntime::_resolve_virtual_call_blob;
92 RuntimeStub* SharedRuntime::_resolve_static_call_blob;
93
94 DeoptimizationBlob* SharedRuntime::_deopt_blob;
95 SafepointBlob* SharedRuntime::_polling_page_vectors_safepoint_handler_blob;
96 SafepointBlob* SharedRuntime::_polling_page_safepoint_handler_blob;
97 SafepointBlob* SharedRuntime::_polling_page_return_handler_blob;
98
99 #ifdef COMPILER2
100 UncommonTrapBlob* SharedRuntime::_uncommon_trap_blob;
101 #endif // COMPILER2
102
103
104 //----------------------------generate_stubs-----------------------------------
105 void SharedRuntime::generate_stubs() {
106 _wrong_method_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method), "wrong_method_stub");
107 _wrong_method_abstract_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract), "wrong_method_abstract_stub");
108 _ic_miss_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss), "ic_miss_stub");
109 _resolve_opt_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C), "resolve_opt_virtual_call");
110 _resolve_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C), "resolve_virtual_call");
111 _resolve_static_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C), "resolve_static_call");
112
113 #if COMPILER2_OR_JVMCI
114 // Vectors are generated only by C2 and JVMCI.
115 bool support_wide = is_wide_vector(MaxVectorSize);
116 if (support_wide) {
117 _polling_page_vectors_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_VECTOR_LOOP);
118 }
119 #endif // COMPILER2_OR_JVMCI
120 _polling_page_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_LOOP);
121 _polling_page_return_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_RETURN);
122
123 generate_deopt_blob();
124
125 #ifdef COMPILER2
126 generate_uncommon_trap_blob();
127 #endif // COMPILER2
128 }
129
130 #include <math.h>
131
132 // Implementation of SharedRuntime
133
134 #ifndef PRODUCT
135 // For statistics
136 int SharedRuntime::_ic_miss_ctr = 0;
137 int SharedRuntime::_wrong_method_ctr = 0;
138 int SharedRuntime::_resolve_static_ctr = 0;
139 int SharedRuntime::_resolve_virtual_ctr = 0;
140 int SharedRuntime::_resolve_opt_virtual_ctr = 0;
141 int SharedRuntime::_implicit_null_throws = 0;
142 int SharedRuntime::_implicit_div0_throws = 0;
143 int SharedRuntime::_throw_null_ctr = 0;
144
145 int SharedRuntime::_nof_normal_calls = 0;
146 int SharedRuntime::_nof_optimized_calls = 0;
147 int SharedRuntime::_nof_inlined_calls = 0;
148 int SharedRuntime::_nof_megamorphic_calls = 0;
149 int SharedRuntime::_nof_static_calls = 0;
150 int SharedRuntime::_nof_inlined_static_calls = 0;
151 int SharedRuntime::_nof_interface_calls = 0;
152 int SharedRuntime::_nof_optimized_interface_calls = 0;
153 int SharedRuntime::_nof_inlined_interface_calls = 0;
154 int SharedRuntime::_nof_megamorphic_interface_calls = 0;
155 int SharedRuntime::_nof_removable_exceptions = 0;
156
157 int SharedRuntime::_new_instance_ctr=0;
158 int SharedRuntime::_new_array_ctr=0;
159 int SharedRuntime::_multi1_ctr=0;
160 int SharedRuntime::_multi2_ctr=0;
161 int SharedRuntime::_multi3_ctr=0;
162 int SharedRuntime::_multi4_ctr=0;
163 int SharedRuntime::_multi5_ctr=0;
164 int SharedRuntime::_mon_enter_stub_ctr=0;
165 int SharedRuntime::_mon_exit_stub_ctr=0;
166 int SharedRuntime::_mon_enter_ctr=0;
167 int SharedRuntime::_mon_exit_ctr=0;
168 int SharedRuntime::_partial_subtype_ctr=0;
169 int SharedRuntime::_jbyte_array_copy_ctr=0;
170 int SharedRuntime::_jshort_array_copy_ctr=0;
171 int SharedRuntime::_jint_array_copy_ctr=0;
172 int SharedRuntime::_jlong_array_copy_ctr=0;
173 int SharedRuntime::_oop_array_copy_ctr=0;
174 int SharedRuntime::_checkcast_array_copy_ctr=0;
175 int SharedRuntime::_unsafe_array_copy_ctr=0;
176 int SharedRuntime::_generic_array_copy_ctr=0;
177 int SharedRuntime::_slow_array_copy_ctr=0;
178 int SharedRuntime::_find_handler_ctr=0;
179 int SharedRuntime::_rethrow_ctr=0;
180
181 int SharedRuntime::_ICmiss_index = 0;
182 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count];
183 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count];
184
185
186 void SharedRuntime::trace_ic_miss(address at) {
187 for (int i = 0; i < _ICmiss_index; i++) {
188 if (_ICmiss_at[i] == at) {
189 _ICmiss_count[i]++;
190 return;
191 }
192 }
193 int index = _ICmiss_index++;
194 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1;
195 _ICmiss_at[index] = at;
196 _ICmiss_count[index] = 1;
197 }
198
199 void SharedRuntime::print_ic_miss_histogram() {
200 if (ICMissHistogram) {
201 tty->print_cr("IC Miss Histogram:");
202 int tot_misses = 0;
203 for (int i = 0; i < _ICmiss_index; i++) {
204 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", p2i(_ICmiss_at[i]), _ICmiss_count[i]);
205 tot_misses += _ICmiss_count[i];
206 }
207 tty->print_cr("Total IC misses: %7d", tot_misses);
208 }
209 }
210 #endif // PRODUCT
211
212
213 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x))
214 return x * y;
215 JRT_END
216
217
218 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x))
219 if (x == min_jlong && y == CONST64(-1)) {
220 return x;
221 } else {
222 return x / y;
223 }
224 JRT_END
225
226
227 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x))
228 if (x == min_jlong && y == CONST64(-1)) {
229 return 0;
230 } else {
231 return x % y;
232 }
233 JRT_END
234
235
236 const juint float_sign_mask = 0x7FFFFFFF;
237 const juint float_infinity = 0x7F800000;
238 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF);
239 const julong double_infinity = CONST64(0x7FF0000000000000);
240
241 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y))
242 #ifdef _WIN64
243 // 64-bit Windows on amd64 returns the wrong values for
244 // infinity operands.
245 union { jfloat f; juint i; } xbits, ybits;
246 xbits.f = x;
247 ybits.f = y;
248 // x Mod Infinity == x unless x is infinity
249 if (((xbits.i & float_sign_mask) != float_infinity) &&
250 ((ybits.i & float_sign_mask) == float_infinity) ) {
251 return x;
252 }
253 return ((jfloat)fmod_winx64((double)x, (double)y));
254 #else
255 return ((jfloat)fmod((double)x,(double)y));
256 #endif
257 JRT_END
258
259
260 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y))
261 #ifdef _WIN64
262 union { jdouble d; julong l; } xbits, ybits;
263 xbits.d = x;
264 ybits.d = y;
265 // x Mod Infinity == x unless x is infinity
266 if (((xbits.l & double_sign_mask) != double_infinity) &&
267 ((ybits.l & double_sign_mask) == double_infinity) ) {
268 return x;
269 }
270 return ((jdouble)fmod_winx64((double)x, (double)y));
271 #else
272 return ((jdouble)fmod((double)x,(double)y));
273 #endif
274 JRT_END
275
276 #ifdef __SOFTFP__
277 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y))
278 return x + y;
279 JRT_END
280
281 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y))
282 return x - y;
283 JRT_END
284
285 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y))
286 return x * y;
287 JRT_END
288
289 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y))
290 return x / y;
291 JRT_END
292
293 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y))
294 return x + y;
295 JRT_END
296
297 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y))
298 return x - y;
299 JRT_END
300
301 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y))
302 return x * y;
303 JRT_END
304
305 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y))
306 return x / y;
307 JRT_END
308
309 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x))
310 return (jfloat)x;
311 JRT_END
312
313 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x))
314 return (jdouble)x;
315 JRT_END
316
317 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x))
318 return (jdouble)x;
319 JRT_END
320
321 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y))
322 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/
323 JRT_END
324
325 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y))
326 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
327 JRT_END
328
329 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y))
330 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */
331 JRT_END
332
333 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y))
334 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
335 JRT_END
336
337 // Functions to return the opposite of the aeabi functions for nan.
338 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(float x, float y))
339 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
340 JRT_END
341
342 JRT_LEAF(int, SharedRuntime::unordered_dcmplt(double x, double y))
343 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
344 JRT_END
345
346 JRT_LEAF(int, SharedRuntime::unordered_fcmple(float x, float y))
347 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
348 JRT_END
349
350 JRT_LEAF(int, SharedRuntime::unordered_dcmple(double x, double y))
351 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
352 JRT_END
353
354 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y))
355 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
356 JRT_END
357
358 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y))
359 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
360 JRT_END
361
362 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y))
363 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
364 JRT_END
365
366 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y))
367 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
368 JRT_END
369
370 // Intrinsics make gcc generate code for these.
371 float SharedRuntime::fneg(float f) {
372 return -f;
373 }
374
375 double SharedRuntime::dneg(double f) {
376 return -f;
377 }
378
379 #endif // __SOFTFP__
380
381 #if defined(__SOFTFP__) || defined(E500V2)
382 // Intrinsics make gcc generate code for these.
383 double SharedRuntime::dabs(double f) {
384 return (f <= (double)0.0) ? (double)0.0 - f : f;
385 }
386
387 #endif
388
389 #if defined(__SOFTFP__) || defined(PPC)
390 double SharedRuntime::dsqrt(double f) {
391 return sqrt(f);
392 }
393 #endif
394
395 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x))
396 if (g_isnan(x))
397 return 0;
398 if (x >= (jfloat) max_jint)
399 return max_jint;
400 if (x <= (jfloat) min_jint)
401 return min_jint;
402 return (jint) x;
403 JRT_END
404
405
406 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x))
407 if (g_isnan(x))
408 return 0;
409 if (x >= (jfloat) max_jlong)
410 return max_jlong;
411 if (x <= (jfloat) min_jlong)
412 return min_jlong;
413 return (jlong) x;
414 JRT_END
415
416
417 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x))
418 if (g_isnan(x))
419 return 0;
420 if (x >= (jdouble) max_jint)
421 return max_jint;
422 if (x <= (jdouble) min_jint)
423 return min_jint;
424 return (jint) x;
425 JRT_END
426
427
428 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x))
429 if (g_isnan(x))
430 return 0;
431 if (x >= (jdouble) max_jlong)
432 return max_jlong;
433 if (x <= (jdouble) min_jlong)
434 return min_jlong;
435 return (jlong) x;
436 JRT_END
437
438
439 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x))
440 return (jfloat)x;
441 JRT_END
442
443
444 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x))
445 return (jfloat)x;
446 JRT_END
447
448
449 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x))
450 return (jdouble)x;
451 JRT_END
452
453 // Exception handling across interpreter/compiler boundaries
454 //
455 // exception_handler_for_return_address(...) returns the continuation address.
456 // The continuation address is the entry point of the exception handler of the
457 // previous frame depending on the return address.
458
459 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* thread, address return_address) {
460 assert(frame::verify_return_pc(return_address), "must be a return address: " INTPTR_FORMAT, p2i(return_address));
461 assert(thread->frames_to_pop_failed_realloc() == 0 || Interpreter::contains(return_address), "missed frames to pop?");
462
463 // Reset method handle flag.
464 thread->set_is_method_handle_return(false);
465
466 #if INCLUDE_JVMCI
467 // JVMCI's ExceptionHandlerStub expects the thread local exception PC to be clear
468 // and other exception handler continuations do not read it
469 thread->set_exception_pc(NULL);
470 #endif // INCLUDE_JVMCI
471
472 // The fastest case first
473 CodeBlob* blob = CodeCache::find_blob(return_address);
474 CompiledMethod* nm = (blob != NULL) ? blob->as_compiled_method_or_null() : NULL;
475 if (nm != NULL) {
476 // Set flag if return address is a method handle call site.
477 thread->set_is_method_handle_return(nm->is_method_handle_return(return_address));
478 // native nmethods don't have exception handlers
479 assert(!nm->is_native_method(), "no exception handler");
480 assert(nm->header_begin() != nm->exception_begin(), "no exception handler");
481 if (nm->is_deopt_pc(return_address)) {
482 // If we come here because of a stack overflow, the stack may be
483 // unguarded. Reguard the stack otherwise if we return to the
484 // deopt blob and the stack bang causes a stack overflow we
485 // crash.
486 bool guard_pages_enabled = thread->stack_guards_enabled();
487 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack();
488 if (thread->reserved_stack_activation() != thread->stack_base()) {
489 thread->set_reserved_stack_activation(thread->stack_base());
490 }
491 assert(guard_pages_enabled, "stack banging in deopt blob may cause crash");
492 return SharedRuntime::deopt_blob()->unpack_with_exception();
493 } else {
494 return nm->exception_begin();
495 }
496 }
497
498 // Entry code
499 if (StubRoutines::returns_to_call_stub(return_address)) {
500 return StubRoutines::catch_exception_entry();
501 }
502 // Interpreted code
503 if (Interpreter::contains(return_address)) {
504 return Interpreter::rethrow_exception_entry();
505 }
506
507 guarantee(blob == NULL || !blob->is_runtime_stub(), "caller should have skipped stub");
508 guarantee(!VtableStubs::contains(return_address), "NULL exceptions in vtables should have been handled already!");
509
510 #ifndef PRODUCT
511 { ResourceMark rm;
512 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", p2i(return_address));
513 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here");
514 tty->print_cr("b) other problem");
515 }
516 #endif // PRODUCT
517
518 ShouldNotReachHere();
519 return NULL;
520 }
521
522
523 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* thread, address return_address))
524 return raw_exception_handler_for_return_address(thread, return_address);
525 JRT_END
526
527
528 address SharedRuntime::get_poll_stub(address pc) {
529 address stub;
530 // Look up the code blob
531 CodeBlob *cb = CodeCache::find_blob(pc);
532
533 // Should be an nmethod
534 guarantee(cb != NULL && cb->is_compiled(), "safepoint polling: pc must refer to an nmethod");
535
536 // Look up the relocation information
537 assert(((CompiledMethod*)cb)->is_at_poll_or_poll_return(pc),
538 "safepoint polling: type must be poll");
539
540 #ifdef ASSERT
541 if (!((NativeInstruction*)pc)->is_safepoint_poll()) {
542 tty->print_cr("bad pc: " PTR_FORMAT, p2i(pc));
543 Disassembler::decode(cb);
544 fatal("Only polling locations are used for safepoint");
545 }
546 #endif
547
548 bool at_poll_return = ((CompiledMethod*)cb)->is_at_poll_return(pc);
549 bool has_wide_vectors = ((CompiledMethod*)cb)->has_wide_vectors();
550 if (at_poll_return) {
551 assert(SharedRuntime::polling_page_return_handler_blob() != NULL,
552 "polling page return stub not created yet");
553 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();
554 } else if (has_wide_vectors) {
555 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != NULL,
556 "polling page vectors safepoint stub not created yet");
557 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point();
558 } else {
559 assert(SharedRuntime::polling_page_safepoint_handler_blob() != NULL,
560 "polling page safepoint stub not created yet");
561 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point();
562 }
563 log_debug(safepoint)("... found polling page %s exception at pc = "
564 INTPTR_FORMAT ", stub =" INTPTR_FORMAT,
565 at_poll_return ? "return" : "loop",
566 (intptr_t)pc, (intptr_t)stub);
567 return stub;
568 }
569
570
571 oop SharedRuntime::retrieve_receiver( Symbol* sig, frame caller ) {
572 assert(caller.is_interpreted_frame(), "");
573 int args_size = ArgumentSizeComputer(sig).size() + 1;
574 assert(args_size <= caller.interpreter_frame_expression_stack_size(), "receiver must be on interpreter stack");
575 oop result = cast_to_oop(*caller.interpreter_frame_tos_at(args_size - 1));
576 assert(Universe::heap()->is_in(result) && oopDesc::is_oop(result), "receiver must be an oop");
577 return result;
578 }
579
580
581 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception) {
582 if (JvmtiExport::can_post_on_exceptions()) {
583 vframeStream vfst(thread, true);
584 methodHandle method = methodHandle(thread, vfst.method());
585 address bcp = method()->bcp_from(vfst.bci());
586 JvmtiExport::post_exception_throw(thread, method(), bcp, h_exception());
587 }
588 Exceptions::_throw(thread, __FILE__, __LINE__, h_exception);
589 }
590
591 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message) {
592 Handle h_exception = Exceptions::new_exception(thread, name, message);
593 throw_and_post_jvmti_exception(thread, h_exception);
594 }
595
596 // The interpreter code to call this tracing function is only
597 // called/generated when UL is on for redefine, class and has the right level
598 // and tags. Since obsolete methods are never compiled, we don't have
599 // to modify the compilers to generate calls to this function.
600 //
601 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry(
602 JavaThread* thread, Method* method))
603 if (method->is_obsolete()) {
604 // We are calling an obsolete method, but this is not necessarily
605 // an error. Our method could have been redefined just after we
606 // fetched the Method* from the constant pool.
607 ResourceMark rm;
608 log_trace(redefine, class, obsolete)("calling obsolete method '%s'", method->name_and_sig_as_C_string());
609 }
610 return 0;
611 JRT_END
612
613 // ret_pc points into caller; we are returning caller's exception handler
614 // for given exception
615 address SharedRuntime::compute_compiled_exc_handler(CompiledMethod* cm, address ret_pc, Handle& exception,
616 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred) {
617 assert(cm != NULL, "must exist");
618 ResourceMark rm;
619
620 #if INCLUDE_JVMCI
621 if (cm->is_compiled_by_jvmci()) {
622 // lookup exception handler for this pc
623 int catch_pco = ret_pc - cm->code_begin();
624 ExceptionHandlerTable table(cm);
625 HandlerTableEntry *t = table.entry_for(catch_pco, -1, 0);
626 if (t != NULL) {
627 return cm->code_begin() + t->pco();
628 } else {
629 return Deoptimization::deoptimize_for_missing_exception_handler(cm);
630 }
631 }
632 #endif // INCLUDE_JVMCI
633
634 nmethod* nm = cm->as_nmethod();
635 ScopeDesc* sd = nm->scope_desc_at(ret_pc);
636 // determine handler bci, if any
637 EXCEPTION_MARK;
638
639 int handler_bci = -1;
640 int scope_depth = 0;
641 if (!force_unwind) {
642 int bci = sd->bci();
643 bool recursive_exception = false;
644 do {
645 bool skip_scope_increment = false;
646 // exception handler lookup
647 Klass* ek = exception->klass();
648 methodHandle mh(THREAD, sd->method());
649 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD);
650 if (HAS_PENDING_EXCEPTION) {
651 recursive_exception = true;
652 // We threw an exception while trying to find the exception handler.
653 // Transfer the new exception to the exception handle which will
654 // be set into thread local storage, and do another lookup for an
655 // exception handler for this exception, this time starting at the
656 // BCI of the exception handler which caused the exception to be
657 // thrown (bugs 4307310 and 4546590). Set "exception" reference
658 // argument to ensure that the correct exception is thrown (4870175).
659 recursive_exception_occurred = true;
660 exception = Handle(THREAD, PENDING_EXCEPTION);
661 CLEAR_PENDING_EXCEPTION;
662 if (handler_bci >= 0) {
663 bci = handler_bci;
664 handler_bci = -1;
665 skip_scope_increment = true;
666 }
667 }
668 else {
669 recursive_exception = false;
670 }
671 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) {
672 sd = sd->sender();
673 if (sd != NULL) {
674 bci = sd->bci();
675 }
676 ++scope_depth;
677 }
678 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != NULL));
679 }
680
681 // found handling method => lookup exception handler
682 int catch_pco = ret_pc - nm->code_begin();
683
684 ExceptionHandlerTable table(nm);
685 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth);
686 if (t == NULL && (nm->is_compiled_by_c1() || handler_bci != -1)) {
687 // Allow abbreviated catch tables. The idea is to allow a method
688 // to materialize its exceptions without committing to the exact
689 // routing of exceptions. In particular this is needed for adding
690 // a synthetic handler to unlock monitors when inlining
691 // synchronized methods since the unlock path isn't represented in
692 // the bytecodes.
693 t = table.entry_for(catch_pco, -1, 0);
694 }
695
696 #ifdef COMPILER1
697 if (t == NULL && nm->is_compiled_by_c1()) {
698 assert(nm->unwind_handler_begin() != NULL, "");
699 return nm->unwind_handler_begin();
700 }
701 #endif
702
703 if (t == NULL) {
704 ttyLocker ttyl;
705 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d", p2i(ret_pc), handler_bci);
706 tty->print_cr(" Exception:");
707 exception->print();
708 tty->cr();
709 tty->print_cr(" Compiled exception table :");
710 table.print();
711 nm->print_code();
712 guarantee(false, "missing exception handler");
713 return NULL;
714 }
715
716 return nm->code_begin() + t->pco();
717 }
718
719 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* thread))
720 // These errors occur only at call sites
721 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError());
722 JRT_END
723
724 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
725 // These errors occur only at call sites
726 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub");
727 JRT_END
728
729 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread))
730 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
731 JRT_END
732
733 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* thread))
734 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
735 JRT_END
736
737 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* thread))
738 // This entry point is effectively only used for NullPointerExceptions which occur at inline
739 // cache sites (when the callee activation is not yet set up) so we are at a call site
740 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
741 JRT_END
742
743 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread))
744 throw_StackOverflowError_common(thread, false);
745 JRT_END
746
747 JRT_ENTRY(void, SharedRuntime::throw_delayed_StackOverflowError(JavaThread* thread))
748 throw_StackOverflowError_common(thread, true);
749 JRT_END
750
751 void SharedRuntime::throw_StackOverflowError_common(JavaThread* thread, bool delayed) {
752 // We avoid using the normal exception construction in this case because
753 // it performs an upcall to Java, and we're already out of stack space.
754 Thread* THREAD = thread;
755 Klass* k = SystemDictionary::StackOverflowError_klass();
756 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK);
757 if (delayed) {
758 java_lang_Throwable::set_message(exception_oop,
759 Universe::delayed_stack_overflow_error_message());
760 }
761 Handle exception (thread, exception_oop);
762 if (StackTraceInThrowable) {
763 java_lang_Throwable::fill_in_stack_trace(exception);
764 }
765 // Increment counter for hs_err file reporting
766 Atomic::inc(&Exceptions::_stack_overflow_errors);
767 throw_and_post_jvmti_exception(thread, exception);
768 }
769
770 address SharedRuntime::continuation_for_implicit_exception(JavaThread* thread,
771 address pc,
772 ImplicitExceptionKind exception_kind)
773 {
774 address target_pc = NULL;
775
776 if (Interpreter::contains(pc)) {
777 #ifdef CC_INTERP
778 // C++ interpreter doesn't throw implicit exceptions
779 ShouldNotReachHere();
780 #else
781 switch (exception_kind) {
782 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry();
783 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry();
784 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry();
785 default: ShouldNotReachHere();
786 }
787 #endif // !CC_INTERP
788 } else {
789 switch (exception_kind) {
790 case STACK_OVERFLOW: {
791 // Stack overflow only occurs upon frame setup; the callee is
792 // going to be unwound. Dispatch to a shared runtime stub
793 // which will cause the StackOverflowError to be fabricated
794 // and processed.
795 // Stack overflow should never occur during deoptimization:
796 // the compiled method bangs the stack by as much as the
797 // interpreter would need in case of a deoptimization. The
798 // deoptimization blob and uncommon trap blob bang the stack
799 // in a debug VM to verify the correctness of the compiled
800 // method stack banging.
801 assert(thread->deopt_mark() == NULL, "no stack overflow from deopt blob/uncommon trap");
802 Events::log_exception(thread, "StackOverflowError at " INTPTR_FORMAT, p2i(pc));
803 return StubRoutines::throw_StackOverflowError_entry();
804 }
805
806 case IMPLICIT_NULL: {
807 if (VtableStubs::contains(pc)) {
808 // We haven't yet entered the callee frame. Fabricate an
809 // exception and begin dispatching it in the caller. Since
810 // the caller was at a call site, it's safe to destroy all
811 // caller-saved registers, as these entry points do.
812 VtableStub* vt_stub = VtableStubs::stub_containing(pc);
813
814 // If vt_stub is NULL, then return NULL to signal handler to report the SEGV error.
815 if (vt_stub == NULL) return NULL;
816
817 if (vt_stub->is_abstract_method_error(pc)) {
818 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs");
819 Events::log_exception(thread, "AbstractMethodError at " INTPTR_FORMAT, p2i(pc));
820 // Instead of throwing the abstract method error here directly, we re-resolve
821 // and will throw the AbstractMethodError during resolve. As a result, we'll
822 // get a more detailed error message.
823 return SharedRuntime::get_handle_wrong_method_stub();
824 } else {
825 Events::log_exception(thread, "NullPointerException at vtable entry " INTPTR_FORMAT, p2i(pc));
826 // Assert that the signal comes from the expected location in stub code.
827 assert(vt_stub->is_null_pointer_exception(pc),
828 "obtained signal from unexpected location in stub code");
829 return StubRoutines::throw_NullPointerException_at_call_entry();
830 }
831 } else {
832 CodeBlob* cb = CodeCache::find_blob(pc);
833
834 // If code blob is NULL, then return NULL to signal handler to report the SEGV error.
835 if (cb == NULL) return NULL;
836
837 // Exception happened in CodeCache. Must be either:
838 // 1. Inline-cache check in C2I handler blob,
839 // 2. Inline-cache check in nmethod, or
840 // 3. Implicit null exception in nmethod
841
842 if (!cb->is_compiled()) {
843 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob();
844 if (!is_in_blob) {
845 // Allow normal crash reporting to handle this
846 return NULL;
847 }
848 Events::log_exception(thread, "NullPointerException in code blob at " INTPTR_FORMAT, p2i(pc));
849 // There is no handler here, so we will simply unwind.
850 return StubRoutines::throw_NullPointerException_at_call_entry();
851 }
852
853 // Otherwise, it's a compiled method. Consult its exception handlers.
854 CompiledMethod* cm = (CompiledMethod*)cb;
855 if (cm->inlinecache_check_contains(pc)) {
856 // exception happened inside inline-cache check code
857 // => the nmethod is not yet active (i.e., the frame
858 // is not set up yet) => use return address pushed by
859 // caller => don't push another return address
860 Events::log_exception(thread, "NullPointerException in IC check " INTPTR_FORMAT, p2i(pc));
861 return StubRoutines::throw_NullPointerException_at_call_entry();
862 }
863
864 if (cm->method()->is_method_handle_intrinsic()) {
865 // exception happened inside MH dispatch code, similar to a vtable stub
866 Events::log_exception(thread, "NullPointerException in MH adapter " INTPTR_FORMAT, p2i(pc));
867 return StubRoutines::throw_NullPointerException_at_call_entry();
868 }
869
870 #ifndef PRODUCT
871 _implicit_null_throws++;
872 #endif
873 target_pc = cm->continuation_for_implicit_null_exception(pc);
874 // If there's an unexpected fault, target_pc might be NULL,
875 // in which case we want to fall through into the normal
876 // error handling code.
877 }
878
879 break; // fall through
880 }
881
882
883 case IMPLICIT_DIVIDE_BY_ZERO: {
884 CompiledMethod* cm = CodeCache::find_compiled(pc);
885 guarantee(cm != NULL, "must have containing compiled method for implicit division-by-zero exceptions");
886 #ifndef PRODUCT
887 _implicit_div0_throws++;
888 #endif
889 target_pc = cm->continuation_for_implicit_div0_exception(pc);
890 // If there's an unexpected fault, target_pc might be NULL,
891 // in which case we want to fall through into the normal
892 // error handling code.
893 break; // fall through
894 }
895
896 default: ShouldNotReachHere();
897 }
898
899 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind");
900
901 if (exception_kind == IMPLICIT_NULL) {
902 #ifndef PRODUCT
903 // for AbortVMOnException flag
904 Exceptions::debug_check_abort("java.lang.NullPointerException");
905 #endif //PRODUCT
906 Events::log_exception(thread, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
907 } else {
908 #ifndef PRODUCT
909 // for AbortVMOnException flag
910 Exceptions::debug_check_abort("java.lang.ArithmeticException");
911 #endif //PRODUCT
912 Events::log_exception(thread, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
913 }
914 return target_pc;
915 }
916
917 ShouldNotReachHere();
918 return NULL;
919 }
920
921
922 /**
923 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is
924 * installed in the native function entry of all native Java methods before
925 * they get linked to their actual native methods.
926 *
927 * \note
928 * This method actually never gets called! The reason is because
929 * the interpreter's native entries call NativeLookup::lookup() which
930 * throws the exception when the lookup fails. The exception is then
931 * caught and forwarded on the return from NativeLookup::lookup() call
932 * before the call to the native function. This might change in the future.
933 */
934 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...))
935 {
936 // We return a bad value here to make sure that the exception is
937 // forwarded before we look at the return value.
938 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badAddress);
939 }
940 JNI_END
941
942 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
943 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
944 }
945
946 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
947 #if INCLUDE_JVMCI
948 if (!obj->klass()->has_finalizer()) {
949 return;
950 }
951 #endif // INCLUDE_JVMCI
952 assert(oopDesc::is_oop(obj), "must be a valid oop");
953 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
954 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
955 JRT_END
956
957
958 jlong SharedRuntime::get_java_tid(Thread* thread) {
959 if (thread != NULL) {
960 if (thread->is_Java_thread()) {
961 oop obj = ((JavaThread*)thread)->threadObj();
962 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj);
963 }
964 }
965 return 0;
966 }
967
968 /**
969 * This function ought to be a void function, but cannot be because
970 * it gets turned into a tail-call on sparc, which runs into dtrace bug
971 * 6254741. Once that is fixed we can remove the dummy return value.
972 */
973 int SharedRuntime::dtrace_object_alloc(oopDesc* o, int size) {
974 return dtrace_object_alloc_base(Thread::current(), o, size);
975 }
976
977 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size) {
978 assert(DTraceAllocProbes, "wrong call");
979 Klass* klass = o->klass();
980 Symbol* name = klass->name();
981 HOTSPOT_OBJECT_ALLOC(
982 get_java_tid(thread),
983 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize);
984 return 0;
985 }
986
987 JRT_LEAF(int, SharedRuntime::dtrace_method_entry(
988 JavaThread* thread, Method* method))
989 assert(DTraceMethodProbes, "wrong call");
990 Symbol* kname = method->klass_name();
991 Symbol* name = method->name();
992 Symbol* sig = method->signature();
993 HOTSPOT_METHOD_ENTRY(
994 get_java_tid(thread),
995 (char *) kname->bytes(), kname->utf8_length(),
996 (char *) name->bytes(), name->utf8_length(),
997 (char *) sig->bytes(), sig->utf8_length());
998 return 0;
999 JRT_END
1000
1001 JRT_LEAF(int, SharedRuntime::dtrace_method_exit(
1002 JavaThread* thread, Method* method))
1003 assert(DTraceMethodProbes, "wrong call");
1004 Symbol* kname = method->klass_name();
1005 Symbol* name = method->name();
1006 Symbol* sig = method->signature();
1007 HOTSPOT_METHOD_RETURN(
1008 get_java_tid(thread),
1009 (char *) kname->bytes(), kname->utf8_length(),
1010 (char *) name->bytes(), name->utf8_length(),
1011 (char *) sig->bytes(), sig->utf8_length());
1012 return 0;
1013 JRT_END
1014
1015
1016 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode)
1017 // for a call current in progress, i.e., arguments has been pushed on stack
1018 // put callee has not been invoked yet. Used by: resolve virtual/static,
1019 // vtable updates, etc. Caller frame must be compiled.
1020 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) {
1021 ResourceMark rm(THREAD);
1022
1023 // last java frame on stack (which includes native call frames)
1024 vframeStream vfst(thread, true); // Do not skip and javaCalls
1025
1026 return find_callee_info_helper(thread, vfst, bc, callinfo, THREAD);
1027 }
1028
1029 methodHandle SharedRuntime::extract_attached_method(vframeStream& vfst) {
1030 CompiledMethod* caller = vfst.nm();
1031
1032 nmethodLocker caller_lock(caller);
1033
1034 address pc = vfst.frame_pc();
1035 { // Get call instruction under lock because another thread may be busy patching it.
1036 CompiledICLocker ic_locker(caller);
1037 return caller->attached_method_before_pc(pc);
1038 }
1039 return NULL;
1040 }
1041
1042 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
1043 // for a call current in progress, i.e., arguments has been pushed on stack
1044 // but callee has not been invoked yet. Caller frame must be compiled.
1045 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread,
1046 vframeStream& vfst,
1047 Bytecodes::Code& bc,
1048 CallInfo& callinfo, TRAPS) {
1049 Handle receiver;
1050 Handle nullHandle; //create a handy null handle for exception returns
1051
1052 assert(!vfst.at_end(), "Java frame must exist");
1053
1054 // Find caller and bci from vframe
1055 methodHandle caller(THREAD, vfst.method());
1056 int bci = vfst.bci();
1057
1058 Bytecode_invoke bytecode(caller, bci);
1059 int bytecode_index = bytecode.index();
1060 bc = bytecode.invoke_code();
1061
1062 methodHandle attached_method = extract_attached_method(vfst);
1063 if (attached_method.not_null()) {
1064 methodHandle callee = bytecode.static_target(CHECK_NH);
1065 vmIntrinsics::ID id = callee->intrinsic_id();
1066 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call,
1067 // it attaches statically resolved method to the call site.
1068 if (MethodHandles::is_signature_polymorphic(id) &&
1069 MethodHandles::is_signature_polymorphic_intrinsic(id)) {
1070 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id);
1071
1072 // Adjust invocation mode according to the attached method.
1073 switch (bc) {
1074 case Bytecodes::_invokevirtual:
1075 if (attached_method->method_holder()->is_interface()) {
1076 bc = Bytecodes::_invokeinterface;
1077 }
1078 break;
1079 case Bytecodes::_invokeinterface:
1080 if (!attached_method->method_holder()->is_interface()) {
1081 bc = Bytecodes::_invokevirtual;
1082 }
1083 break;
1084 case Bytecodes::_invokehandle:
1085 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) {
1086 bc = attached_method->is_static() ? Bytecodes::_invokestatic
1087 : Bytecodes::_invokevirtual;
1088 }
1089 break;
1090 default:
1091 break;
1092 }
1093 } else {
1094 assert(attached_method->has_scalarized_args(), "invalid use of attached method");
1095 if (!attached_method->method_holder()->is_value()) {
1096 // Ignore the attached method in this case to not confuse below code
1097 attached_method = NULL;
1098 }
1099 }
1100 }
1101
1102 assert(bc != Bytecodes::_illegal, "not initialized");
1103
1104 bool has_receiver = bc != Bytecodes::_invokestatic &&
1105 bc != Bytecodes::_invokedynamic &&
1106 bc != Bytecodes::_invokehandle;
1107
1108 // Find receiver for non-static call
1109 if (has_receiver) {
1110 // This register map must be update since we need to find the receiver for
1111 // compiled frames. The receiver might be in a register.
1112 RegisterMap reg_map2(thread);
1113 frame stubFrame = thread->last_frame();
1114 // Caller-frame is a compiled frame
1115 frame callerFrame = stubFrame.sender(®_map2);
1116 bool caller_is_c1 = false;
1117
1118 if (callerFrame.is_compiled_frame() && !callerFrame.is_deoptimized_frame()) {
1119 caller_is_c1 = callerFrame.cb()->is_compiled_by_c1();
1120 }
1121
1122 methodHandle callee = attached_method;
1123 if (callee.is_null()) {
1124 callee = bytecode.static_target(CHECK_NH);
1125 if (callee.is_null()) {
1126 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1127 }
1128 }
1129 if (!caller_is_c1 && callee->has_scalarized_args() && callee->method_holder()->is_value()) {
1130 // If the receiver is a value type that is passed as fields, no oop is available.
1131 // Resolve the call without receiver null checking.
1132 assert(!attached_method.is_null(), "must have attached method");
1133 if (bc == Bytecodes::_invokevirtual) {
1134 LinkInfo link_info(attached_method->method_holder(), attached_method->name(), attached_method->signature());
1135 LinkResolver::resolve_virtual_call(callinfo, receiver, callee->method_holder(), link_info, /*check_null_and_abstract=*/ false, CHECK_NH);
1136 } else {
1137 assert(bc == Bytecodes::_invokeinterface, "anything else?");
1138 LinkInfo link_info(constantPoolHandle(THREAD, caller->constants()), bytecode_index, CHECK_NH);
1139 LinkResolver::resolve_interface_call(callinfo, receiver, callee->method_holder(), link_info, /*check_null_and_abstract=*/ false, CHECK_NH);
1140 }
1141 return receiver; // is null
1142 } else {
1143 // Retrieve from a compiled argument list
1144 receiver = Handle(THREAD, callerFrame.retrieve_receiver(®_map2));
1145
1146 if (receiver.is_null()) {
1147 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1148 }
1149 }
1150 }
1151
1152 // Resolve method
1153 if (attached_method.not_null()) {
1154 // Parameterized by attached method.
1155 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, CHECK_NH);
1156 } else {
1157 // Parameterized by bytecode.
1158 constantPoolHandle constants(THREAD, caller->constants());
1159 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH);
1160 }
1161
1162 #ifdef ASSERT
1163 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1164 if (has_receiver) {
1165 assert(receiver.not_null(), "should have thrown exception");
1166 Klass* receiver_klass = receiver->klass();
1167 Klass* rk = NULL;
1168 if (attached_method.not_null()) {
1169 // In case there's resolved method attached, use its holder during the check.
1170 rk = attached_method->method_holder();
1171 } else {
1172 // Klass is already loaded.
1173 constantPoolHandle constants(THREAD, caller->constants());
1174 rk = constants->klass_ref_at(bytecode_index, CHECK_NH);
1175 }
1176 Klass* static_receiver_klass = rk;
1177 methodHandle callee = callinfo.selected_method();
1178 assert(receiver_klass->is_subtype_of(static_receiver_klass),
1179 "actual receiver must be subclass of static receiver klass");
1180 if (receiver_klass->is_instance_klass()) {
1181 if (InstanceKlass::cast(receiver_klass)->is_not_initialized()) {
1182 tty->print_cr("ERROR: Klass not yet initialized!!");
1183 receiver_klass->print();
1184 }
1185 assert(!InstanceKlass::cast(receiver_klass)->is_not_initialized(), "receiver_klass must be initialized");
1186 }
1187 }
1188 #endif
1189
1190 return receiver;
1191 }
1192
1193 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) {
1194 ResourceMark rm(THREAD);
1195 // We need first to check if any Java activations (compiled, interpreted)
1196 // exist on the stack since last JavaCall. If not, we need
1197 // to get the target method from the JavaCall wrapper.
1198 vframeStream vfst(thread, true); // Do not skip any javaCalls
1199 methodHandle callee_method;
1200 if (vfst.at_end()) {
1201 // No Java frames were found on stack since we did the JavaCall.
1202 // Hence the stack can only contain an entry_frame. We need to
1203 // find the target method from the stub frame.
1204 RegisterMap reg_map(thread, false);
1205 frame fr = thread->last_frame();
1206 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1207 fr = fr.sender(®_map);
1208 assert(fr.is_entry_frame(), "must be");
1209 // fr is now pointing to the entry frame.
1210 callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method());
1211 } else {
1212 Bytecodes::Code bc;
1213 CallInfo callinfo;
1214 find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle()));
1215 callee_method = callinfo.selected_method();
1216 }
1217 assert(callee_method()->is_method(), "must be");
1218 return callee_method;
1219 }
1220
1221 // Resolves a call.
1222 methodHandle SharedRuntime::resolve_helper(JavaThread *thread,
1223 bool is_virtual,
1224 bool is_optimized,
1225 bool* caller_is_c1, TRAPS) {
1226 methodHandle callee_method;
1227 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, caller_is_c1, THREAD);
1228 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
1229 int retry_count = 0;
1230 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() &&
1231 callee_method->method_holder() != SystemDictionary::Object_klass()) {
1232 // If has a pending exception then there is no need to re-try to
1233 // resolve this method.
1234 // If the method has been redefined, we need to try again.
1235 // Hack: we have no way to update the vtables of arrays, so don't
1236 // require that java.lang.Object has been updated.
1237
1238 // It is very unlikely that method is redefined more than 100 times
1239 // in the middle of resolve. If it is looping here more than 100 times
1240 // means then there could be a bug here.
1241 guarantee((retry_count++ < 100),
1242 "Could not resolve to latest version of redefined method");
1243 // method is redefined in the middle of resolve so re-try.
1244 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, caller_is_c1, THREAD);
1245 }
1246 }
1247 return callee_method;
1248 }
1249
1250 // This fails if resolution required refilling of IC stubs
1251 bool SharedRuntime::resolve_sub_helper_internal(methodHandle callee_method, const frame& caller_frame,
1252 CompiledMethod* caller_nm, bool is_virtual, bool is_optimized,
1253 Handle receiver, CallInfo& call_info, Bytecodes::Code invoke_code, TRAPS) {
1254 StaticCallInfo static_call_info;
1255 CompiledICInfo virtual_call_info;
1256
1257 // Make sure the callee nmethod does not get deoptimized and removed before
1258 // we are done patching the code.
1259 CompiledMethod* callee = callee_method->code();
1260
1261 if (callee != NULL) {
1262 assert(callee->is_compiled(), "must be nmethod for patching");
1263 }
1264
1265 if (callee != NULL && !callee->is_in_use()) {
1266 // Patch call site to C2I adapter if callee nmethod is deoptimized or unloaded.
1267 callee = NULL;
1268 }
1269 nmethodLocker nl_callee(callee);
1270 #ifdef ASSERT
1271 address dest_entry_point = callee == NULL ? 0 : callee->entry_point(); // used below
1272 #endif
1273
1274 bool is_nmethod = caller_nm->is_nmethod();
1275 bool caller_is_c1 = caller_nm->is_compiled_by_c1();
1276
1277 if (is_virtual) {
1278 Klass* receiver_klass = NULL;
1279 if (ValueTypePassFieldsAsArgs && !caller_is_c1 && callee_method->method_holder()->is_value()) {
1280 // If the receiver is a value type that is passed as fields, no oop is available
1281 receiver_klass = callee_method->method_holder();
1282 } else {
1283 assert(receiver.not_null() || invoke_code == Bytecodes::_invokehandle, "sanity check");
1284 receiver_klass = invoke_code == Bytecodes::_invokehandle ? NULL : receiver->klass();
1285 }
1286 bool static_bound = call_info.resolved_method()->can_be_statically_bound();
1287 CompiledIC::compute_monomorphic_entry(callee_method, receiver_klass,
1288 is_optimized, static_bound, is_nmethod, caller_is_c1, virtual_call_info,
1289 CHECK_false);
1290 } else {
1291 // static call
1292 CompiledStaticCall::compute_entry(callee_method, caller_nm, static_call_info);
1293 }
1294
1295 // grab lock, check for deoptimization and potentially patch caller
1296 {
1297 CompiledICLocker ml(caller_nm);
1298
1299 // Lock blocks for safepoint during which both nmethods can change state.
1300
1301 // Now that we are ready to patch if the Method* was redefined then
1302 // don't update call site and let the caller retry.
1303 // Don't update call site if callee nmethod was unloaded or deoptimized.
1304 // Don't update call site if callee nmethod was replaced by an other nmethod
1305 // which may happen when multiply alive nmethod (tiered compilation)
1306 // will be supported.
1307 if (!callee_method->is_old() &&
1308 (callee == NULL || (callee->is_in_use() && callee_method->code() == callee))) {
1309 #ifdef ASSERT
1310 // We must not try to patch to jump to an already unloaded method.
1311 if (dest_entry_point != 0) {
1312 CodeBlob* cb = CodeCache::find_blob(dest_entry_point);
1313 assert((cb != NULL) && cb->is_compiled() && (((CompiledMethod*)cb) == callee),
1314 "should not call unloaded nmethod");
1315 }
1316 #endif
1317 if (is_virtual) {
1318 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1319 if (inline_cache->is_clean()) {
1320 if (!inline_cache->set_to_monomorphic(virtual_call_info)) {
1321 return false;
1322 }
1323 }
1324 } else {
1325 if (VM_Version::supports_fast_class_init_checks() &&
1326 invoke_code == Bytecodes::_invokestatic &&
1327 callee_method->needs_clinit_barrier() &&
1328 callee != NULL && (callee->is_compiled_by_jvmci() || callee->is_aot())) {
1329 return true; // skip patching for JVMCI or AOT code
1330 }
1331 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_before(caller_frame.pc());
1332 if (ssc->is_clean()) ssc->set(static_call_info);
1333 }
1334 }
1335 } // unlock CompiledICLocker
1336 return true;
1337 }
1338
1339 // Resolves a call. The compilers generate code for calls that go here
1340 // and are patched with the real destination of the call.
1341 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread,
1342 bool is_virtual,
1343 bool is_optimized,
1344 bool* caller_is_c1, TRAPS) {
1345
1346 ResourceMark rm(thread);
1347 RegisterMap cbl_map(thread, false);
1348 frame caller_frame = thread->last_frame().sender(&cbl_map);
1349
1350 CodeBlob* caller_cb = caller_frame.cb();
1351 guarantee(caller_cb != NULL && caller_cb->is_compiled(), "must be called from compiled method");
1352 CompiledMethod* caller_nm = caller_cb->as_compiled_method_or_null();
1353 *caller_is_c1 = caller_nm->is_compiled_by_c1();
1354
1355 // make sure caller is not getting deoptimized
1356 // and removed before we are done with it.
1357 // CLEANUP - with lazy deopt shouldn't need this lock
1358 nmethodLocker caller_lock(caller_nm);
1359
1360 if (!is_virtual && !is_optimized) {
1361 SimpleScopeDesc ssd(caller_nm, caller_frame.pc());
1362 Bytecode bc(ssd.method(), ssd.method()->bcp_from(ssd.bci()));
1363 // Substitutability test implementation piggy backs on static call resolution
1364 if (bc.code() == Bytecodes::_if_acmpeq || bc.code() == Bytecodes::_if_acmpne) {
1365 SystemDictionary::ValueBootstrapMethods_klass()->initialize(CHECK_NULL);
1366 return SystemDictionary::ValueBootstrapMethods_klass()->find_method(vmSymbols::isSubstitutable_name(), vmSymbols::object_object_boolean_signature());
1367 }
1368 }
1369
1370 // determine call info & receiver
1371 // note: a) receiver is NULL for static calls
1372 // b) an exception is thrown if receiver is NULL for non-static calls
1373 CallInfo call_info;
1374 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1375 Handle receiver = find_callee_info(thread, invoke_code,
1376 call_info, CHECK_(methodHandle()));
1377 methodHandle callee_method = call_info.selected_method();
1378
1379 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1380 (!is_virtual && invoke_code == Bytecodes::_invokespecial) ||
1381 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1382 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1383 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1384
1385 assert(caller_nm->is_alive() && !caller_nm->is_unloading(), "It should be alive");
1386
1387 #ifndef PRODUCT
1388 // tracing/debugging/statistics
1389 int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
1390 (is_virtual) ? (&_resolve_virtual_ctr) :
1391 (&_resolve_static_ctr);
1392 Atomic::inc(addr);
1393
1394 if (TraceCallFixup) {
1395 ResourceMark rm(thread);
1396 tty->print("resolving %s%s (%s) call to",
1397 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
1398 Bytecodes::name(invoke_code));
1399 callee_method->print_short_name(tty);
1400 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT,
1401 p2i(caller_frame.pc()), p2i(callee_method->code()));
1402 }
1403 #endif
1404
1405 if (invoke_code == Bytecodes::_invokestatic) {
1406 assert(callee_method->method_holder()->is_initialized() ||
1407 callee_method->method_holder()->is_reentrant_initialization(thread),
1408 "invalid class initialization state for invoke_static");
1409 if (!VM_Version::supports_fast_class_init_checks() && callee_method->needs_clinit_barrier()) {
1410 // In order to keep class initialization check, do not patch call
1411 // site for static call when the class is not fully initialized.
1412 // Proper check is enforced by call site re-resolution on every invocation.
1413 //
1414 // When fast class initialization checks are supported (VM_Version::supports_fast_class_init_checks() == true),
1415 // explicit class initialization check is put in nmethod entry (VEP).
1416 assert(callee_method->method_holder()->is_linked(), "must be");
1417 return callee_method;
1418 }
1419 }
1420
1421 // JSR 292 key invariant:
1422 // If the resolved method is a MethodHandle invoke target, the call
1423 // site must be a MethodHandle call site, because the lambda form might tail-call
1424 // leaving the stack in a state unknown to either caller or callee
1425 // TODO detune for now but we might need it again
1426 // assert(!callee_method->is_compiled_lambda_form() ||
1427 // caller_nm->is_method_handle_return(caller_frame.pc()), "must be MH call site");
1428
1429 // Compute entry points. This might require generation of C2I converter
1430 // frames, so we cannot be holding any locks here. Furthermore, the
1431 // computation of the entry points is independent of patching the call. We
1432 // always return the entry-point, but we only patch the stub if the call has
1433 // not been deoptimized. Return values: For a virtual call this is an
1434 // (cached_oop, destination address) pair. For a static call/optimized
1435 // virtual this is just a destination address.
1436
1437 // Patching IC caches may fail if we run out if transition stubs.
1438 // We refill the ic stubs then and try again.
1439 for (;;) {
1440 ICRefillVerifier ic_refill_verifier;
1441 bool successful = resolve_sub_helper_internal(callee_method, caller_frame, caller_nm,
1442 is_virtual, is_optimized, receiver,
1443 call_info, invoke_code, CHECK_(methodHandle()));
1444 if (successful) {
1445 return callee_method;
1446 } else {
1447 InlineCacheBuffer::refill_ic_stubs();
1448 }
1449 }
1450
1451 }
1452
1453
1454 // Inline caches exist only in compiled code
1455 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread))
1456 #ifdef ASSERT
1457 RegisterMap reg_map(thread, false);
1458 frame stub_frame = thread->last_frame();
1459 assert(stub_frame.is_runtime_frame(), "sanity check");
1460 frame caller_frame = stub_frame.sender(®_map);
1461 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame");
1462 #endif /* ASSERT */
1463
1464 methodHandle callee_method;
1465 bool is_optimized = false;
1466 bool caller_is_c1 = false;
1467 JRT_BLOCK
1468 callee_method = SharedRuntime::handle_ic_miss_helper(thread, is_optimized, caller_is_c1, CHECK_NULL);
1469 // Return Method* through TLS
1470 thread->set_vm_result_2(callee_method());
1471 JRT_BLOCK_END
1472 // return compiled code entry point after potential safepoints
1473 return entry_for_handle_wrong_method(callee_method, is_optimized, caller_is_c1);
1474 JRT_END
1475
1476
1477 // Handle call site that has been made non-entrant
1478 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread))
1479 // 6243940 We might end up in here if the callee is deoptimized
1480 // as we race to call it. We don't want to take a safepoint if
1481 // the caller was interpreted because the caller frame will look
1482 // interpreted to the stack walkers and arguments are now
1483 // "compiled" so it is much better to make this transition
1484 // invisible to the stack walking code. The i2c path will
1485 // place the callee method in the callee_target. It is stashed
1486 // there because if we try and find the callee by normal means a
1487 // safepoint is possible and have trouble gc'ing the compiled args.
1488 RegisterMap reg_map(thread, false);
1489 frame stub_frame = thread->last_frame();
1490 assert(stub_frame.is_runtime_frame(), "sanity check");
1491 frame caller_frame = stub_frame.sender(®_map);
1492
1493 if (caller_frame.is_interpreted_frame() ||
1494 caller_frame.is_entry_frame()) {
1495 Method* callee = thread->callee_target();
1496 guarantee(callee != NULL && callee->is_method(), "bad handshake");
1497 thread->set_vm_result_2(callee);
1498 thread->set_callee_target(NULL);
1499 return callee->get_c2i_entry();
1500 }
1501
1502 // Must be compiled to compiled path which is safe to stackwalk
1503 methodHandle callee_method;
1504 bool is_optimized = false;
1505 bool caller_is_c1 = false;
1506 JRT_BLOCK
1507 // Force resolving of caller (if we called from compiled frame)
1508 callee_method = SharedRuntime::reresolve_call_site(thread, is_optimized, caller_is_c1, CHECK_NULL);
1509 thread->set_vm_result_2(callee_method());
1510 JRT_BLOCK_END
1511 // return compiled code entry point after potential safepoints
1512 return entry_for_handle_wrong_method(callee_method, is_optimized, caller_is_c1);
1513 JRT_END
1514
1515 // Handle abstract method call
1516 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* thread))
1517 // Verbose error message for AbstractMethodError.
1518 // Get the called method from the invoke bytecode.
1519 vframeStream vfst(thread, true);
1520 assert(!vfst.at_end(), "Java frame must exist");
1521 methodHandle caller(vfst.method());
1522 Bytecode_invoke invoke(caller, vfst.bci());
1523 DEBUG_ONLY( invoke.verify(); )
1524
1525 // Find the compiled caller frame.
1526 RegisterMap reg_map(thread);
1527 frame stubFrame = thread->last_frame();
1528 assert(stubFrame.is_runtime_frame(), "must be");
1529 frame callerFrame = stubFrame.sender(®_map);
1530 assert(callerFrame.is_compiled_frame(), "must be");
1531
1532 // Install exception and return forward entry.
1533 address res = StubRoutines::throw_AbstractMethodError_entry();
1534 JRT_BLOCK
1535 methodHandle callee = invoke.static_target(thread);
1536 if (!callee.is_null()) {
1537 oop recv = callerFrame.retrieve_receiver(®_map);
1538 Klass *recv_klass = (recv != NULL) ? recv->klass() : NULL;
1539 LinkResolver::throw_abstract_method_error(callee, recv_klass, thread);
1540 res = StubRoutines::forward_exception_entry();
1541 }
1542 JRT_BLOCK_END
1543 return res;
1544 JRT_END
1545
1546
1547 // resolve a static call and patch code
1548 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread ))
1549 methodHandle callee_method;
1550 bool caller_is_c1;
1551 JRT_BLOCK
1552 callee_method = SharedRuntime::resolve_helper(thread, false, false, &caller_is_c1, CHECK_NULL);
1553 thread->set_vm_result_2(callee_method());
1554 JRT_BLOCK_END
1555 // return compiled code entry point after potential safepoints
1556 address entry = caller_is_c1 ?
1557 callee_method->verified_value_code_entry() : callee_method->verified_code_entry();
1558 assert(entry != NULL, "Jump to zero!");
1559 return entry;
1560 JRT_END
1561
1562
1563 // resolve virtual call and update inline cache to monomorphic
1564 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread ))
1565 methodHandle callee_method;
1566 bool caller_is_c1;
1567 JRT_BLOCK
1568 callee_method = SharedRuntime::resolve_helper(thread, true, false, &caller_is_c1, CHECK_NULL);
1569 thread->set_vm_result_2(callee_method());
1570 JRT_BLOCK_END
1571 // return compiled code entry point after potential safepoints
1572 address entry = caller_is_c1 ?
1573 callee_method->verified_value_code_entry() : callee_method->verified_value_ro_code_entry();
1574 assert(entry != NULL, "Jump to zero!");
1575 return entry;
1576 JRT_END
1577
1578
1579 // Resolve a virtual call that can be statically bound (e.g., always
1580 // monomorphic, so it has no inline cache). Patch code to resolved target.
1581 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread))
1582 methodHandle callee_method;
1583 bool caller_is_c1;
1584 JRT_BLOCK
1585 callee_method = SharedRuntime::resolve_helper(thread, true, true, &caller_is_c1, CHECK_NULL);
1586 thread->set_vm_result_2(callee_method());
1587 JRT_BLOCK_END
1588 // return compiled code entry point after potential safepoints
1589 address entry = caller_is_c1 ?
1590 callee_method->verified_value_code_entry() : callee_method->verified_code_entry();
1591 assert(entry != NULL, "Jump to zero!");
1592 return entry;
1593 JRT_END
1594
1595 // The handle_ic_miss_helper_internal function returns false if it failed due
1596 // to either running out of vtable stubs or ic stubs due to IC transitions
1597 // to transitional states. The needs_ic_stub_refill value will be set if
1598 // the failure was due to running out of IC stubs, in which case handle_ic_miss_helper
1599 // refills the IC stubs and tries again.
1600 bool SharedRuntime::handle_ic_miss_helper_internal(Handle receiver, CompiledMethod* caller_nm,
1601 const frame& caller_frame, methodHandle callee_method,
1602 Bytecodes::Code bc, CallInfo& call_info,
1603 bool& needs_ic_stub_refill, bool& is_optimized, bool caller_is_c1, TRAPS) {
1604 CompiledICLocker ml(caller_nm);
1605 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1606 bool should_be_mono = false;
1607 if (inline_cache->is_optimized()) {
1608 if (TraceCallFixup) {
1609 ResourceMark rm(THREAD);
1610 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc));
1611 callee_method->print_short_name(tty);
1612 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1613 }
1614 is_optimized = true;
1615 should_be_mono = true;
1616 } else if (inline_cache->is_icholder_call()) {
1617 CompiledICHolder* ic_oop = inline_cache->cached_icholder();
1618 if (ic_oop != NULL) {
1619 if (!ic_oop->is_loader_alive()) {
1620 // Deferred IC cleaning due to concurrent class unloading
1621 if (!inline_cache->set_to_clean()) {
1622 needs_ic_stub_refill = true;
1623 return false;
1624 }
1625 } else if (receiver()->klass() == ic_oop->holder_klass()) {
1626 // This isn't a real miss. We must have seen that compiled code
1627 // is now available and we want the call site converted to a
1628 // monomorphic compiled call site.
1629 // We can't assert for callee_method->code() != NULL because it
1630 // could have been deoptimized in the meantime
1631 if (TraceCallFixup) {
1632 ResourceMark rm(THREAD);
1633 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc));
1634 callee_method->print_short_name(tty);
1635 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1636 }
1637 should_be_mono = true;
1638 }
1639 }
1640 }
1641
1642 if (should_be_mono) {
1643 // We have a path that was monomorphic but was going interpreted
1644 // and now we have (or had) a compiled entry. We correct the IC
1645 // by using a new icBuffer.
1646 CompiledICInfo info;
1647 Klass* receiver_klass = receiver()->klass();
1648 inline_cache->compute_monomorphic_entry(callee_method,
1649 receiver_klass,
1650 inline_cache->is_optimized(),
1651 false, caller_nm->is_nmethod(),
1652 caller_nm->is_compiled_by_c1(),
1653 info, CHECK_false);
1654 if (!inline_cache->set_to_monomorphic(info)) {
1655 needs_ic_stub_refill = true;
1656 return false;
1657 }
1658 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) {
1659 // Potential change to megamorphic
1660
1661 bool successful = inline_cache->set_to_megamorphic(&call_info, bc, needs_ic_stub_refill, caller_is_c1, CHECK_false);
1662 if (needs_ic_stub_refill) {
1663 return false;
1664 }
1665 if (!successful) {
1666 if (!inline_cache->set_to_clean()) {
1667 needs_ic_stub_refill = true;
1668 return false;
1669 }
1670 }
1671 } else {
1672 // Either clean or megamorphic
1673 }
1674 return true;
1675 }
1676
1677 methodHandle SharedRuntime::handle_ic_miss_helper(JavaThread *thread, bool& is_optimized, bool& caller_is_c1, TRAPS) {
1678 ResourceMark rm(thread);
1679 CallInfo call_info;
1680 Bytecodes::Code bc;
1681
1682 // receiver is NULL for static calls. An exception is thrown for NULL
1683 // receivers for non-static calls
1684 Handle receiver = find_callee_info(thread, bc, call_info,
1685 CHECK_(methodHandle()));
1686 // Compiler1 can produce virtual call sites that can actually be statically bound
1687 // If we fell thru to below we would think that the site was going megamorphic
1688 // when in fact the site can never miss. Worse because we'd think it was megamorphic
1689 // we'd try and do a vtable dispatch however methods that can be statically bound
1690 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a
1691 // reresolution of the call site (as if we did a handle_wrong_method and not an
1692 // plain ic_miss) and the site will be converted to an optimized virtual call site
1693 // never to miss again. I don't believe C2 will produce code like this but if it
1694 // did this would still be the correct thing to do for it too, hence no ifdef.
1695 //
1696 if (call_info.resolved_method()->can_be_statically_bound()) {
1697 methodHandle callee_method = SharedRuntime::reresolve_call_site(thread, is_optimized, caller_is_c1, CHECK_(methodHandle()));
1698 if (TraceCallFixup) {
1699 RegisterMap reg_map(thread, false);
1700 frame caller_frame = thread->last_frame().sender(®_map);
1701 ResourceMark rm(thread);
1702 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc));
1703 callee_method->print_short_name(tty);
1704 tty->print_cr(" from pc: " INTPTR_FORMAT, p2i(caller_frame.pc()));
1705 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1706 }
1707 return callee_method;
1708 }
1709
1710 methodHandle callee_method = call_info.selected_method();
1711
1712 #ifndef PRODUCT
1713 Atomic::inc(&_ic_miss_ctr);
1714
1715 // Statistics & Tracing
1716 if (TraceCallFixup) {
1717 ResourceMark rm(thread);
1718 tty->print("IC miss (%s) call to", Bytecodes::name(bc));
1719 callee_method->print_short_name(tty);
1720 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1721 }
1722
1723 if (ICMissHistogram) {
1724 MutexLocker m(VMStatistic_lock);
1725 RegisterMap reg_map(thread, false);
1726 frame f = thread->last_frame().real_sender(®_map);// skip runtime stub
1727 // produce statistics under the lock
1728 trace_ic_miss(f.pc());
1729 }
1730 #endif
1731
1732 // install an event collector so that when a vtable stub is created the
1733 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1734 // event can't be posted when the stub is created as locks are held
1735 // - instead the event will be deferred until the event collector goes
1736 // out of scope.
1737 JvmtiDynamicCodeEventCollector event_collector;
1738
1739 // Update inline cache to megamorphic. Skip update if we are called from interpreted.
1740 // Transitioning IC caches may require transition stubs. If we run out
1741 // of transition stubs, we have to drop locks and perform a safepoint
1742 // that refills them.
1743 RegisterMap reg_map(thread, false);
1744 frame caller_frame = thread->last_frame().sender(®_map);
1745 CodeBlob* cb = caller_frame.cb();
1746 CompiledMethod* caller_nm = cb->as_compiled_method();
1747 caller_is_c1 = caller_nm->is_compiled_by_c1();
1748
1749 for (;;) {
1750 ICRefillVerifier ic_refill_verifier;
1751 bool needs_ic_stub_refill = false;
1752 bool successful = handle_ic_miss_helper_internal(receiver, caller_nm, caller_frame, callee_method,
1753 bc, call_info, needs_ic_stub_refill, is_optimized, caller_is_c1, CHECK_(methodHandle()));
1754 if (successful || !needs_ic_stub_refill) {
1755 return callee_method;
1756 } else {
1757 InlineCacheBuffer::refill_ic_stubs();
1758 }
1759 }
1760 }
1761
1762 static bool clear_ic_at_addr(CompiledMethod* caller_nm, address call_addr, bool is_static_call) {
1763 CompiledICLocker ml(caller_nm);
1764 if (is_static_call) {
1765 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_at(call_addr);
1766 if (!ssc->is_clean()) {
1767 return ssc->set_to_clean();
1768 }
1769 } else {
1770 // compiled, dispatched call (which used to call an interpreted method)
1771 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1772 if (!inline_cache->is_clean()) {
1773 return inline_cache->set_to_clean();
1774 }
1775 }
1776 return true;
1777 }
1778
1779 //
1780 // Resets a call-site in compiled code so it will get resolved again.
1781 // This routines handles both virtual call sites, optimized virtual call
1782 // sites, and static call sites. Typically used to change a call sites
1783 // destination from compiled to interpreted.
1784 //
1785 methodHandle SharedRuntime::reresolve_call_site(JavaThread *thread, bool& is_optimized, bool& caller_is_c1, TRAPS) {
1786 ResourceMark rm(thread);
1787 RegisterMap reg_map(thread, false);
1788 frame stub_frame = thread->last_frame();
1789 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1790 frame caller = stub_frame.sender(®_map);
1791
1792 // Do nothing if the frame isn't a live compiled frame.
1793 // nmethod could be deoptimized by the time we get here
1794 // so no update to the caller is needed.
1795
1796 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) {
1797
1798 address pc = caller.pc();
1799
1800 // Check for static or virtual call
1801 bool is_static_call = false;
1802 CompiledMethod* caller_nm = CodeCache::find_compiled(pc);
1803 caller_is_c1 = caller_nm->is_compiled_by_c1();
1804
1805 // Default call_addr is the location of the "basic" call.
1806 // Determine the address of the call we a reresolving. With
1807 // Inline Caches we will always find a recognizable call.
1808 // With Inline Caches disabled we may or may not find a
1809 // recognizable call. We will always find a call for static
1810 // calls and for optimized virtual calls. For vanilla virtual
1811 // calls it depends on the state of the UseInlineCaches switch.
1812 //
1813 // With Inline Caches disabled we can get here for a virtual call
1814 // for two reasons:
1815 // 1 - calling an abstract method. The vtable for abstract methods
1816 // will run us thru handle_wrong_method and we will eventually
1817 // end up in the interpreter to throw the ame.
1818 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1819 // call and between the time we fetch the entry address and
1820 // we jump to it the target gets deoptimized. Similar to 1
1821 // we will wind up in the interprter (thru a c2i with c2).
1822 //
1823 address call_addr = NULL;
1824 {
1825 // Get call instruction under lock because another thread may be
1826 // busy patching it.
1827 CompiledICLocker ml(caller_nm);
1828 // Location of call instruction
1829 call_addr = caller_nm->call_instruction_address(pc);
1830 }
1831 // Make sure nmethod doesn't get deoptimized and removed until
1832 // this is done with it.
1833 // CLEANUP - with lazy deopt shouldn't need this lock
1834 nmethodLocker nmlock(caller_nm);
1835
1836 if (call_addr != NULL) {
1837 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1838 int ret = iter.next(); // Get item
1839 if (ret) {
1840 assert(iter.addr() == call_addr, "must find call");
1841 if (iter.type() == relocInfo::static_call_type) {
1842 is_static_call = true;
1843 } else {
1844 assert(iter.type() == relocInfo::virtual_call_type ||
1845 iter.type() == relocInfo::opt_virtual_call_type
1846 , "unexpected relocInfo. type");
1847 is_optimized = (iter.type() == relocInfo::opt_virtual_call_type);
1848 }
1849 } else {
1850 assert(!UseInlineCaches, "relocation info. must exist for this address");
1851 }
1852
1853 // Cleaning the inline cache will force a new resolve. This is more robust
1854 // than directly setting it to the new destination, since resolving of calls
1855 // is always done through the same code path. (experience shows that it
1856 // leads to very hard to track down bugs, if an inline cache gets updated
1857 // to a wrong method). It should not be performance critical, since the
1858 // resolve is only done once.
1859
1860 for (;;) {
1861 ICRefillVerifier ic_refill_verifier;
1862 if (!clear_ic_at_addr(caller_nm, call_addr, is_static_call)) {
1863 InlineCacheBuffer::refill_ic_stubs();
1864 } else {
1865 break;
1866 }
1867 }
1868 }
1869 }
1870
1871 methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle()));
1872
1873 #ifndef PRODUCT
1874 Atomic::inc(&_wrong_method_ctr);
1875
1876 if (TraceCallFixup) {
1877 ResourceMark rm(thread);
1878 tty->print("handle_wrong_method reresolving call to");
1879 callee_method->print_short_name(tty);
1880 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1881 }
1882 #endif
1883
1884 return callee_method;
1885 }
1886
1887 address SharedRuntime::handle_unsafe_access(JavaThread* thread, address next_pc) {
1888 // The faulting unsafe accesses should be changed to throw the error
1889 // synchronously instead. Meanwhile the faulting instruction will be
1890 // skipped over (effectively turning it into a no-op) and an
1891 // asynchronous exception will be raised which the thread will
1892 // handle at a later point. If the instruction is a load it will
1893 // return garbage.
1894
1895 // Request an async exception.
1896 thread->set_pending_unsafe_access_error();
1897
1898 // Return address of next instruction to execute.
1899 return next_pc;
1900 }
1901
1902 #ifdef ASSERT
1903 void SharedRuntime::check_member_name_argument_is_last_argument(const methodHandle& method,
1904 const BasicType* sig_bt,
1905 const VMRegPair* regs) {
1906 ResourceMark rm;
1907 const int total_args_passed = method->size_of_parameters();
1908 const VMRegPair* regs_with_member_name = regs;
1909 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1);
1910
1911 const int member_arg_pos = total_args_passed - 1;
1912 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob");
1913 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object");
1914
1915 const bool is_outgoing = method->is_method_handle_intrinsic();
1916 int comp_args_on_stack = java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1, is_outgoing);
1917
1918 for (int i = 0; i < member_arg_pos; i++) {
1919 VMReg a = regs_with_member_name[i].first();
1920 VMReg b = regs_without_member_name[i].first();
1921 assert(a->value() == b->value(), "register allocation mismatch: a=" INTX_FORMAT ", b=" INTX_FORMAT, a->value(), b->value());
1922 }
1923 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg");
1924 }
1925 #endif
1926
1927 bool SharedRuntime::should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb) {
1928 if (destination != entry_point) {
1929 CodeBlob* callee = CodeCache::find_blob(destination);
1930 // callee == cb seems weird. It means calling interpreter thru stub.
1931 if (callee != NULL && (callee == cb || callee->is_adapter_blob())) {
1932 // static call or optimized virtual
1933 if (TraceCallFixup) {
1934 tty->print("fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1935 moop->print_short_name(tty);
1936 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
1937 }
1938 return true;
1939 } else {
1940 if (TraceCallFixup) {
1941 tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1942 moop->print_short_name(tty);
1943 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
1944 }
1945 // assert is too strong could also be resolve destinations.
1946 // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be");
1947 }
1948 } else {
1949 if (TraceCallFixup) {
1950 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1951 moop->print_short_name(tty);
1952 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
1953 }
1954 }
1955 return false;
1956 }
1957
1958 // ---------------------------------------------------------------------------
1959 // We are calling the interpreter via a c2i. Normally this would mean that
1960 // we were called by a compiled method. However we could have lost a race
1961 // where we went int -> i2c -> c2i and so the caller could in fact be
1962 // interpreted. If the caller is compiled we attempt to patch the caller
1963 // so he no longer calls into the interpreter.
1964 JRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc))
1965 Method* moop(method);
1966
1967 address entry_point = moop->from_compiled_entry_no_trampoline();
1968
1969 // It's possible that deoptimization can occur at a call site which hasn't
1970 // been resolved yet, in which case this function will be called from
1971 // an nmethod that has been patched for deopt and we can ignore the
1972 // request for a fixup.
1973 // Also it is possible that we lost a race in that from_compiled_entry
1974 // is now back to the i2c in that case we don't need to patch and if
1975 // we did we'd leap into space because the callsite needs to use
1976 // "to interpreter" stub in order to load up the Method*. Don't
1977 // ask me how I know this...
1978
1979 CodeBlob* cb = CodeCache::find_blob(caller_pc);
1980 if (cb == NULL || !cb->is_compiled() || entry_point == moop->get_c2i_entry()) {
1981 return;
1982 }
1983
1984 // The check above makes sure this is a nmethod.
1985 CompiledMethod* nm = cb->as_compiled_method_or_null();
1986 assert(nm, "must be");
1987
1988 // Get the return PC for the passed caller PC.
1989 address return_pc = caller_pc + frame::pc_return_offset;
1990
1991 // There is a benign race here. We could be attempting to patch to a compiled
1992 // entry point at the same time the callee is being deoptimized. If that is
1993 // the case then entry_point may in fact point to a c2i and we'd patch the
1994 // call site with the same old data. clear_code will set code() to NULL
1995 // at the end of it. If we happen to see that NULL then we can skip trying
1996 // to patch. If we hit the window where the callee has a c2i in the
1997 // from_compiled_entry and the NULL isn't present yet then we lose the race
1998 // and patch the code with the same old data. Asi es la vida.
1999
2000 if (moop->code() == NULL) return;
2001
2002 if (nm->is_in_use()) {
2003 // Expect to find a native call there (unless it was no-inline cache vtable dispatch)
2004 CompiledICLocker ic_locker(nm);
2005 if (NativeCall::is_call_before(return_pc)) {
2006 ResourceMark mark;
2007 NativeCallWrapper* call = nm->call_wrapper_before(return_pc);
2008 //
2009 // bug 6281185. We might get here after resolving a call site to a vanilla
2010 // virtual call. Because the resolvee uses the verified entry it may then
2011 // see compiled code and attempt to patch the site by calling us. This would
2012 // then incorrectly convert the call site to optimized and its downhill from
2013 // there. If you're lucky you'll get the assert in the bugid, if not you've
2014 // just made a call site that could be megamorphic into a monomorphic site
2015 // for the rest of its life! Just another racing bug in the life of
2016 // fixup_callers_callsite ...
2017 //
2018 RelocIterator iter(nm, call->instruction_address(), call->next_instruction_address());
2019 iter.next();
2020 assert(iter.has_current(), "must have a reloc at java call site");
2021 relocInfo::relocType typ = iter.reloc()->type();
2022 if (typ != relocInfo::static_call_type &&
2023 typ != relocInfo::opt_virtual_call_type &&
2024 typ != relocInfo::static_stub_type) {
2025 return;
2026 }
2027 address destination = call->destination();
2028 if (should_fixup_call_destination(destination, entry_point, caller_pc, moop, cb)) {
2029 call->set_destination_mt_safe(entry_point);
2030 }
2031 }
2032 }
2033 JRT_END
2034
2035
2036 // same as JVM_Arraycopy, but called directly from compiled code
2037 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos,
2038 oopDesc* dest, jint dest_pos,
2039 jint length,
2040 JavaThread* thread)) {
2041 #ifndef PRODUCT
2042 _slow_array_copy_ctr++;
2043 #endif
2044 // Check if we have null pointers
2045 if (src == NULL || dest == NULL) {
2046 THROW(vmSymbols::java_lang_NullPointerException());
2047 }
2048 // Do the copy. The casts to arrayOop are necessary to the copy_array API,
2049 // even though the copy_array API also performs dynamic checks to ensure
2050 // that src and dest are truly arrays (and are conformable).
2051 // The copy_array mechanism is awkward and could be removed, but
2052 // the compilers don't call this function except as a last resort,
2053 // so it probably doesn't matter.
2054 src->klass()->copy_array((arrayOopDesc*)src, src_pos,
2055 (arrayOopDesc*)dest, dest_pos,
2056 length, thread);
2057 }
2058 JRT_END
2059
2060 // The caller of generate_class_cast_message() (or one of its callers)
2061 // must use a ResourceMark in order to correctly free the result.
2062 char* SharedRuntime::generate_class_cast_message(
2063 JavaThread* thread, Klass* caster_klass) {
2064
2065 // Get target class name from the checkcast instruction
2066 vframeStream vfst(thread, true);
2067 assert(!vfst.at_end(), "Java frame must exist");
2068 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci()));
2069 constantPoolHandle cpool(thread, vfst.method()->constants());
2070 Klass* target_klass = ConstantPool::klass_at_if_loaded(cpool, cc.index());
2071 Symbol* target_klass_name = NULL;
2072 if (target_klass == NULL) {
2073 // This klass should be resolved, but just in case, get the name in the klass slot.
2074 target_klass_name = cpool->klass_name_at(cc.index());
2075 }
2076 return generate_class_cast_message(caster_klass, target_klass, target_klass_name);
2077 }
2078
2079
2080 // The caller of generate_class_cast_message() (or one of its callers)
2081 // must use a ResourceMark in order to correctly free the result.
2082 char* SharedRuntime::generate_class_cast_message(
2083 Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name) {
2084 const char* caster_name = caster_klass->external_name();
2085
2086 assert(target_klass != NULL || target_klass_name != NULL, "one must be provided");
2087 const char* target_name = target_klass == NULL ? target_klass_name->as_C_string() :
2088 target_klass->external_name();
2089
2090 size_t msglen = strlen(caster_name) + strlen("class ") + strlen(" cannot be cast to class ") + strlen(target_name) + 1;
2091
2092 const char* caster_klass_description = "";
2093 const char* target_klass_description = "";
2094 const char* klass_separator = "";
2095 if (target_klass != NULL && caster_klass->module() == target_klass->module()) {
2096 caster_klass_description = caster_klass->joint_in_module_of_loader(target_klass);
2097 } else {
2098 caster_klass_description = caster_klass->class_in_module_of_loader();
2099 target_klass_description = (target_klass != NULL) ? target_klass->class_in_module_of_loader() : "";
2100 klass_separator = (target_klass != NULL) ? "; " : "";
2101 }
2102
2103 // add 3 for parenthesis and preceeding space
2104 msglen += strlen(caster_klass_description) + strlen(target_klass_description) + strlen(klass_separator) + 3;
2105
2106 char* message = NEW_RESOURCE_ARRAY_RETURN_NULL(char, msglen);
2107 if (message == NULL) {
2108 // Shouldn't happen, but don't cause even more problems if it does
2109 message = const_cast<char*>(caster_klass->external_name());
2110 } else {
2111 jio_snprintf(message,
2112 msglen,
2113 "class %s cannot be cast to class %s (%s%s%s)",
2114 caster_name,
2115 target_name,
2116 caster_klass_description,
2117 klass_separator,
2118 target_klass_description
2119 );
2120 }
2121 return message;
2122 }
2123
2124 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
2125 (void) JavaThread::current()->reguard_stack();
2126 JRT_END
2127
2128
2129 // Handles the uncommon case in locking, i.e., contention or an inflated lock.
2130 JRT_BLOCK_ENTRY(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread))
2131 if (!SafepointSynchronize::is_synchronizing()) {
2132 // Only try quick_enter() if we're not trying to reach a safepoint
2133 // so that the calling thread reaches the safepoint more quickly.
2134 if (ObjectSynchronizer::quick_enter(_obj, thread, lock)) return;
2135 }
2136 // NO_ASYNC required because an async exception on the state transition destructor
2137 // would leave you with the lock held and it would never be released.
2138 // The normal monitorenter NullPointerException is thrown without acquiring a lock
2139 // and the model is that an exception implies the method failed.
2140 JRT_BLOCK_NO_ASYNC
2141 oop obj(_obj);
2142 if (PrintBiasedLockingStatistics) {
2143 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
2144 }
2145 Handle h_obj(THREAD, obj);
2146 if (UseBiasedLocking) {
2147 // Retry fast entry if bias is revoked to avoid unnecessary inflation
2148 ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK);
2149 } else {
2150 ObjectSynchronizer::slow_enter(h_obj, lock, CHECK);
2151 }
2152 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
2153 JRT_BLOCK_END
2154 JRT_END
2155
2156 // Handles the uncommon cases of monitor unlocking in compiled code
2157 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock, JavaThread * THREAD))
2158 oop obj(_obj);
2159 assert(JavaThread::current() == THREAD, "invariant");
2160 // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore
2161 // testing was unable to ever fire the assert that guarded it so I have removed it.
2162 assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?");
2163 #undef MIGHT_HAVE_PENDING
2164 #ifdef MIGHT_HAVE_PENDING
2165 // Save and restore any pending_exception around the exception mark.
2166 // While the slow_exit must not throw an exception, we could come into
2167 // this routine with one set.
2168 oop pending_excep = NULL;
2169 const char* pending_file;
2170 int pending_line;
2171 if (HAS_PENDING_EXCEPTION) {
2172 pending_excep = PENDING_EXCEPTION;
2173 pending_file = THREAD->exception_file();
2174 pending_line = THREAD->exception_line();
2175 CLEAR_PENDING_EXCEPTION;
2176 }
2177 #endif /* MIGHT_HAVE_PENDING */
2178
2179 {
2180 // Exit must be non-blocking, and therefore no exceptions can be thrown.
2181 EXCEPTION_MARK;
2182 ObjectSynchronizer::slow_exit(obj, lock, THREAD);
2183 }
2184
2185 #ifdef MIGHT_HAVE_PENDING
2186 if (pending_excep != NULL) {
2187 THREAD->set_pending_exception(pending_excep, pending_file, pending_line);
2188 }
2189 #endif /* MIGHT_HAVE_PENDING */
2190 JRT_END
2191
2192 #ifndef PRODUCT
2193
2194 void SharedRuntime::print_statistics() {
2195 ttyLocker ttyl;
2196 if (xtty != NULL) xtty->head("statistics type='SharedRuntime'");
2197
2198 if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr);
2199
2200 SharedRuntime::print_ic_miss_histogram();
2201
2202 if (CountRemovableExceptions) {
2203 if (_nof_removable_exceptions > 0) {
2204 Unimplemented(); // this counter is not yet incremented
2205 tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions);
2206 }
2207 }
2208
2209 // Dump the JRT_ENTRY counters
2210 if (_new_instance_ctr) tty->print_cr("%5d new instance requires GC", _new_instance_ctr);
2211 if (_new_array_ctr) tty->print_cr("%5d new array requires GC", _new_array_ctr);
2212 if (_multi1_ctr) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr);
2213 if (_multi2_ctr) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr);
2214 if (_multi3_ctr) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr);
2215 if (_multi4_ctr) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr);
2216 if (_multi5_ctr) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr);
2217
2218 tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr);
2219 tty->print_cr("%5d wrong method", _wrong_method_ctr);
2220 tty->print_cr("%5d unresolved static call site", _resolve_static_ctr);
2221 tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr);
2222 tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr);
2223
2224 if (_mon_enter_stub_ctr) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr);
2225 if (_mon_exit_stub_ctr) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr);
2226 if (_mon_enter_ctr) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr);
2227 if (_mon_exit_ctr) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr);
2228 if (_partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr);
2229 if (_jbyte_array_copy_ctr) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr);
2230 if (_jshort_array_copy_ctr) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr);
2231 if (_jint_array_copy_ctr) tty->print_cr("%5d int array copies", _jint_array_copy_ctr);
2232 if (_jlong_array_copy_ctr) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr);
2233 if (_oop_array_copy_ctr) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr);
2234 if (_checkcast_array_copy_ctr) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr);
2235 if (_unsafe_array_copy_ctr) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr);
2236 if (_generic_array_copy_ctr) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr);
2237 if (_slow_array_copy_ctr) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr);
2238 if (_find_handler_ctr) tty->print_cr("%5d find exception handler", _find_handler_ctr);
2239 if (_rethrow_ctr) tty->print_cr("%5d rethrow handler", _rethrow_ctr);
2240
2241 AdapterHandlerLibrary::print_statistics();
2242
2243 if (xtty != NULL) xtty->tail("statistics");
2244 }
2245
2246 inline double percent(int x, int y) {
2247 return 100.0 * x / MAX2(y, 1);
2248 }
2249
2250 class MethodArityHistogram {
2251 public:
2252 enum { MAX_ARITY = 256 };
2253 private:
2254 static int _arity_histogram[MAX_ARITY]; // histogram of #args
2255 static int _size_histogram[MAX_ARITY]; // histogram of arg size in words
2256 static int _max_arity; // max. arity seen
2257 static int _max_size; // max. arg size seen
2258
2259 static void add_method_to_histogram(nmethod* nm) {
2260 if (CompiledMethod::nmethod_access_is_safe(nm)) {
2261 Method* method = nm->method();
2262 ArgumentCount args(method->signature());
2263 int arity = args.size() + (method->is_static() ? 0 : 1);
2264 int argsize = method->size_of_parameters();
2265 arity = MIN2(arity, MAX_ARITY-1);
2266 argsize = MIN2(argsize, MAX_ARITY-1);
2267 int count = method->compiled_invocation_count();
2268 _arity_histogram[arity] += count;
2269 _size_histogram[argsize] += count;
2270 _max_arity = MAX2(_max_arity, arity);
2271 _max_size = MAX2(_max_size, argsize);
2272 }
2273 }
2274
2275 void print_histogram_helper(int n, int* histo, const char* name) {
2276 const int N = MIN2(5, n);
2277 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2278 double sum = 0;
2279 double weighted_sum = 0;
2280 int i;
2281 for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; }
2282 double rest = sum;
2283 double percent = sum / 100;
2284 for (i = 0; i <= N; i++) {
2285 rest -= histo[i];
2286 tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent);
2287 }
2288 tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent);
2289 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n);
2290 }
2291
2292 void print_histogram() {
2293 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2294 print_histogram_helper(_max_arity, _arity_histogram, "arity");
2295 tty->print_cr("\nSame for parameter size (in words):");
2296 print_histogram_helper(_max_size, _size_histogram, "size");
2297 tty->cr();
2298 }
2299
2300 public:
2301 MethodArityHistogram() {
2302 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2303 _max_arity = _max_size = 0;
2304 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram[i] = 0;
2305 CodeCache::nmethods_do(add_method_to_histogram);
2306 print_histogram();
2307 }
2308 };
2309
2310 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY];
2311 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY];
2312 int MethodArityHistogram::_max_arity;
2313 int MethodArityHistogram::_max_size;
2314
2315 void SharedRuntime::print_call_statistics(int comp_total) {
2316 tty->print_cr("Calls from compiled code:");
2317 int total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls;
2318 int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls;
2319 int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls;
2320 tty->print_cr("\t%9d (%4.1f%%) total non-inlined ", total, percent(total, total));
2321 tty->print_cr("\t%9d (%4.1f%%) virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total));
2322 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls));
2323 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls));
2324 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_c, percent(mono_c, _nof_normal_calls));
2325 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls));
2326 tty->print_cr("\t%9d (%4.1f%%) interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total));
2327 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls));
2328 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls));
2329 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_i, percent(mono_i, _nof_interface_calls));
2330 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls));
2331 tty->print_cr("\t%9d (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total));
2332 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls));
2333 tty->cr();
2334 tty->print_cr("Note 1: counter updates are not MT-safe.");
2335 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
2336 tty->print_cr(" %% in nested categories are relative to their category");
2337 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
2338 tty->cr();
2339
2340 MethodArityHistogram h;
2341 }
2342 #endif
2343
2344
2345 // A simple wrapper class around the calling convention information
2346 // that allows sharing of adapters for the same calling convention.
2347 class AdapterFingerPrint : public CHeapObj<mtCode> {
2348 private:
2349 enum {
2350 _basic_type_bits = 4,
2351 _basic_type_mask = right_n_bits(_basic_type_bits),
2352 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2353 _compact_int_count = 3
2354 };
2355 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2356 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2357
2358 union {
2359 int _compact[_compact_int_count];
2360 int* _fingerprint;
2361 } _value;
2362 int _length; // A negative length indicates the fingerprint is in the compact form,
2363 // Otherwise _value._fingerprint is the array.
2364
2365 // Remap BasicTypes that are handled equivalently by the adapters.
2366 // These are correct for the current system but someday it might be
2367 // necessary to make this mapping platform dependent.
2368 static int adapter_encoding(BasicType in, bool is_valuetype) {
2369 switch (in) {
2370 case T_BOOLEAN:
2371 case T_BYTE:
2372 case T_SHORT:
2373 case T_CHAR: {
2374 if (is_valuetype) {
2375 // Do not widen value type field types
2376 assert(ValueTypePassFieldsAsArgs, "must be enabled");
2377 return in;
2378 } else {
2379 // They are all promoted to T_INT in the calling convention
2380 return T_INT;
2381 }
2382 }
2383
2384 case T_VALUETYPE: {
2385 // If value types are passed as fields, return 'in' to differentiate
2386 // between a T_VALUETYPE and a T_OBJECT in the signature.
2387 return ValueTypePassFieldsAsArgs ? in : adapter_encoding(T_OBJECT, false);
2388 }
2389
2390 case T_OBJECT:
2391 case T_ARRAY:
2392 // In other words, we assume that any register good enough for
2393 // an int or long is good enough for a managed pointer.
2394 #ifdef _LP64
2395 return T_LONG;
2396 #else
2397 return T_INT;
2398 #endif
2399
2400 case T_INT:
2401 case T_LONG:
2402 case T_FLOAT:
2403 case T_DOUBLE:
2404 case T_VOID:
2405 return in;
2406
2407 default:
2408 ShouldNotReachHere();
2409 return T_CONFLICT;
2410 }
2411 }
2412
2413 public:
2414 AdapterFingerPrint(const GrowableArray<SigEntry>* sig, bool has_ro_adapter = false) {
2415 // The fingerprint is based on the BasicType signature encoded
2416 // into an array of ints with eight entries per int.
2417 int total_args_passed = (sig != NULL) ? sig->length() : 0;
2418 int* ptr;
2419 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int;
2420 if (len <= _compact_int_count) {
2421 assert(_compact_int_count == 3, "else change next line");
2422 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0;
2423 // Storing the signature encoded as signed chars hits about 98%
2424 // of the time.
2425 _length = -len;
2426 ptr = _value._compact;
2427 } else {
2428 _length = len;
2429 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode);
2430 ptr = _value._fingerprint;
2431 }
2432
2433 // Now pack the BasicTypes with 8 per int
2434 int sig_index = 0;
2435 BasicType prev_sbt = T_ILLEGAL;
2436 int vt_count = 0;
2437 for (int index = 0; index < len; index++) {
2438 int value = 0;
2439 for (int byte = 0; byte < _basic_types_per_int; byte++) {
2440 int bt = 0;
2441 if (sig_index < total_args_passed) {
2442 BasicType sbt = sig->at(sig_index++)._bt;
2443 if (ValueTypePassFieldsAsArgs && sbt == T_VALUETYPE) {
2444 // Found start of value type in signature
2445 vt_count++;
2446 if (sig_index == 1 && has_ro_adapter) {
2447 // With a ro_adapter, replace receiver value type delimiter by T_VOID to prevent matching
2448 // with other adapters that have the same value type as first argument and no receiver.
2449 sbt = T_VOID;
2450 }
2451 } else if (ValueTypePassFieldsAsArgs && sbt == T_VOID &&
2452 prev_sbt != T_LONG && prev_sbt != T_DOUBLE) {
2453 // Found end of value type in signature
2454 vt_count--;
2455 assert(vt_count >= 0, "invalid vt_count");
2456 }
2457 bt = adapter_encoding(sbt, vt_count > 0);
2458 prev_sbt = sbt;
2459 }
2460 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits");
2461 value = (value << _basic_type_bits) | bt;
2462 }
2463 ptr[index] = value;
2464 }
2465 assert(vt_count == 0, "invalid vt_count");
2466 }
2467
2468 ~AdapterFingerPrint() {
2469 if (_length > 0) {
2470 FREE_C_HEAP_ARRAY(int, _value._fingerprint);
2471 }
2472 }
2473
2474 int value(int index) {
2475 if (_length < 0) {
2476 return _value._compact[index];
2477 }
2478 return _value._fingerprint[index];
2479 }
2480 int length() {
2481 if (_length < 0) return -_length;
2482 return _length;
2483 }
2484
2485 bool is_compact() {
2486 return _length <= 0;
2487 }
2488
2489 unsigned int compute_hash() {
2490 int hash = 0;
2491 for (int i = 0; i < length(); i++) {
2492 int v = value(i);
2493 hash = (hash << 8) ^ v ^ (hash >> 5);
2494 }
2495 return (unsigned int)hash;
2496 }
2497
2498 const char* as_string() {
2499 stringStream st;
2500 st.print("0x");
2501 for (int i = 0; i < length(); i++) {
2502 st.print("%08x", value(i));
2503 }
2504 return st.as_string();
2505 }
2506
2507 bool equals(AdapterFingerPrint* other) {
2508 if (other->_length != _length) {
2509 return false;
2510 }
2511 if (_length < 0) {
2512 assert(_compact_int_count == 3, "else change next line");
2513 return _value._compact[0] == other->_value._compact[0] &&
2514 _value._compact[1] == other->_value._compact[1] &&
2515 _value._compact[2] == other->_value._compact[2];
2516 } else {
2517 for (int i = 0; i < _length; i++) {
2518 if (_value._fingerprint[i] != other->_value._fingerprint[i]) {
2519 return false;
2520 }
2521 }
2522 }
2523 return true;
2524 }
2525 };
2526
2527
2528 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
2529 class AdapterHandlerTable : public BasicHashtable<mtCode> {
2530 friend class AdapterHandlerTableIterator;
2531
2532 private:
2533
2534 #ifndef PRODUCT
2535 static int _lookups; // number of calls to lookup
2536 static int _buckets; // number of buckets checked
2537 static int _equals; // number of buckets checked with matching hash
2538 static int _hits; // number of successful lookups
2539 static int _compact; // number of equals calls with compact signature
2540 #endif
2541
2542 AdapterHandlerEntry* bucket(int i) {
2543 return (AdapterHandlerEntry*)BasicHashtable<mtCode>::bucket(i);
2544 }
2545
2546 public:
2547 AdapterHandlerTable()
2548 : BasicHashtable<mtCode>(293, (DumpSharedSpaces ? sizeof(CDSAdapterHandlerEntry) : sizeof(AdapterHandlerEntry))) { }
2549
2550 // Create a new entry suitable for insertion in the table
2551 AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry,
2552 address c2i_value_entry, address c2i_value_ro_entry,
2553 address c2i_unverified_entry, address c2i_unverified_value_entry) {
2554 AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable<mtCode>::new_entry(fingerprint->compute_hash());
2555 entry->init(fingerprint, i2c_entry, c2i_entry, c2i_value_entry, c2i_value_ro_entry,
2556 c2i_unverified_entry, c2i_unverified_value_entry);
2557 if (DumpSharedSpaces) {
2558 ((CDSAdapterHandlerEntry*)entry)->init();
2559 }
2560 return entry;
2561 }
2562
2563 // Insert an entry into the table
2564 void add(AdapterHandlerEntry* entry) {
2565 int index = hash_to_index(entry->hash());
2566 add_entry(index, entry);
2567 }
2568
2569 void free_entry(AdapterHandlerEntry* entry) {
2570 entry->deallocate();
2571 BasicHashtable<mtCode>::free_entry(entry);
2572 }
2573
2574 // Find a entry with the same fingerprint if it exists
2575 AdapterHandlerEntry* lookup(const GrowableArray<SigEntry>* sig, bool has_ro_adapter = false) {
2576 NOT_PRODUCT(_lookups++);
2577 AdapterFingerPrint fp(sig, has_ro_adapter);
2578 unsigned int hash = fp.compute_hash();
2579 int index = hash_to_index(hash);
2580 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2581 NOT_PRODUCT(_buckets++);
2582 if (e->hash() == hash) {
2583 NOT_PRODUCT(_equals++);
2584 if (fp.equals(e->fingerprint())) {
2585 #ifndef PRODUCT
2586 if (fp.is_compact()) _compact++;
2587 _hits++;
2588 #endif
2589 return e;
2590 }
2591 }
2592 }
2593 return NULL;
2594 }
2595
2596 #ifndef PRODUCT
2597 void print_statistics() {
2598 ResourceMark rm;
2599 int longest = 0;
2600 int empty = 0;
2601 int total = 0;
2602 int nonempty = 0;
2603 for (int index = 0; index < table_size(); index++) {
2604 int count = 0;
2605 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2606 count++;
2607 }
2608 if (count != 0) nonempty++;
2609 if (count == 0) empty++;
2610 if (count > longest) longest = count;
2611 total += count;
2612 }
2613 tty->print_cr("AdapterHandlerTable: empty %d longest %d total %d average %f",
2614 empty, longest, total, total / (double)nonempty);
2615 tty->print_cr("AdapterHandlerTable: lookups %d buckets %d equals %d hits %d compact %d",
2616 _lookups, _buckets, _equals, _hits, _compact);
2617 }
2618 #endif
2619 };
2620
2621
2622 #ifndef PRODUCT
2623
2624 int AdapterHandlerTable::_lookups;
2625 int AdapterHandlerTable::_buckets;
2626 int AdapterHandlerTable::_equals;
2627 int AdapterHandlerTable::_hits;
2628 int AdapterHandlerTable::_compact;
2629
2630 #endif
2631
2632 class AdapterHandlerTableIterator : public StackObj {
2633 private:
2634 AdapterHandlerTable* _table;
2635 int _index;
2636 AdapterHandlerEntry* _current;
2637
2638 void scan() {
2639 while (_index < _table->table_size()) {
2640 AdapterHandlerEntry* a = _table->bucket(_index);
2641 _index++;
2642 if (a != NULL) {
2643 _current = a;
2644 return;
2645 }
2646 }
2647 }
2648
2649 public:
2650 AdapterHandlerTableIterator(AdapterHandlerTable* table): _table(table), _index(0), _current(NULL) {
2651 scan();
2652 }
2653 bool has_next() {
2654 return _current != NULL;
2655 }
2656 AdapterHandlerEntry* next() {
2657 if (_current != NULL) {
2658 AdapterHandlerEntry* result = _current;
2659 _current = _current->next();
2660 if (_current == NULL) scan();
2661 return result;
2662 } else {
2663 return NULL;
2664 }
2665 }
2666 };
2667
2668
2669 // ---------------------------------------------------------------------------
2670 // Implementation of AdapterHandlerLibrary
2671 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL;
2672 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL;
2673 const int AdapterHandlerLibrary_size = 16*K;
2674 BufferBlob* AdapterHandlerLibrary::_buffer = NULL;
2675
2676 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2677 // Should be called only when AdapterHandlerLibrary_lock is active.
2678 if (_buffer == NULL) // Initialize lazily
2679 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2680 return _buffer;
2681 }
2682
2683 extern "C" void unexpected_adapter_call() {
2684 ShouldNotCallThis();
2685 }
2686
2687 void AdapterHandlerLibrary::initialize() {
2688 if (_adapters != NULL) return;
2689 _adapters = new AdapterHandlerTable();
2690
2691 // Create a special handler for abstract methods. Abstract methods
2692 // are never compiled so an i2c entry is somewhat meaningless, but
2693 // throw AbstractMethodError just in case.
2694 // Pass wrong_method_abstract for the c2i transitions to return
2695 // AbstractMethodError for invalid invocations.
2696 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
2697 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(NULL),
2698 StubRoutines::throw_AbstractMethodError_entry(),
2699 wrong_method_abstract, wrong_method_abstract, wrong_method_abstract,
2700 wrong_method_abstract, wrong_method_abstract);
2701 }
2702
2703 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint,
2704 address i2c_entry,
2705 address c2i_entry,
2706 address c2i_value_entry,
2707 address c2i_value_ro_entry,
2708 address c2i_unverified_entry,
2709 address c2i_unverified_value_entry) {
2710 return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_value_entry, c2i_value_ro_entry, c2i_unverified_entry,
2711 c2i_unverified_value_entry);
2712 }
2713
2714 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) {
2715 AdapterHandlerEntry* entry = get_adapter0(method);
2716 if (method->is_shared()) {
2717 // See comments around Method::link_method()
2718 MutexLocker mu(AdapterHandlerLibrary_lock);
2719 if (method->adapter() == NULL) {
2720 method->update_adapter_trampoline(entry);
2721 }
2722 address trampoline = method->from_compiled_entry();
2723 if (*(int*)trampoline == 0) {
2724 CodeBuffer buffer(trampoline, (int)SharedRuntime::trampoline_size());
2725 MacroAssembler _masm(&buffer);
2726 SharedRuntime::generate_trampoline(&_masm, entry->get_c2i_entry());
2727 assert(*(int*)trampoline != 0, "Instruction(s) for trampoline must not be encoded as zeros.");
2728
2729 if (PrintInterpreter) {
2730 Disassembler::decode(buffer.insts_begin(), buffer.insts_end());
2731 }
2732 }
2733 }
2734
2735 return entry;
2736 }
2737
2738 CompiledEntrySignature::CompiledEntrySignature(Method* method) {
2739 _method = method;
2740 _num_value_args = 0;
2741 _has_value_recv = false;
2742 _has_scalarized_args = false;
2743 _c1_needs_stack_repair = false;
2744 _c2_needs_stack_repair = false;
2745 _sig = new GrowableArray<SigEntry>(method->size_of_parameters());
2746 if (!method->is_static()) {
2747 if (method->method_holder()->is_value()) {
2748 _has_value_recv = true;
2749 _num_value_args ++;
2750 }
2751 SigEntry::add_entry(_sig, T_OBJECT);
2752 }
2753 for (SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) {
2754 BasicType bt = ss.type();
2755 if (bt == T_VALUETYPE) {
2756 _num_value_args ++;
2757 bt = T_OBJECT;
2758 }
2759 SigEntry::add_entry(_sig, bt);
2760 }
2761 }
2762
2763 int CompiledEntrySignature::compute_scalarized_cc(Method* method, GrowableArray<SigEntry>*& sig_cc, VMRegPair*& regs_cc, bool scalar_receiver) {
2764 InstanceKlass* holder = method->method_holder();
2765 sig_cc = new GrowableArray<SigEntry>(method->size_of_parameters());
2766 if (!method->is_static()) {
2767 if (holder->is_value() && scalar_receiver) {
2768 sig_cc->appendAll(ValueKlass::cast(holder)->extended_sig());
2769 } else {
2770 SigEntry::add_entry(sig_cc, T_OBJECT);
2771 }
2772 }
2773 Thread* THREAD = Thread::current();
2774 for (SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) {
2775 if (ss.type() == T_VALUETYPE) {
2776 Klass* k = ss.as_klass(Handle(THREAD, holder->class_loader()),
2777 Handle(THREAD, holder->protection_domain()),
2778 SignatureStream::ReturnNull, THREAD);
2779 assert(k != NULL && !HAS_PENDING_EXCEPTION, "value klass should have been pre-loaded");
2780 sig_cc->appendAll(ValueKlass::cast(k)->extended_sig());
2781 } else {
2782 SigEntry::add_entry(sig_cc, ss.type());
2783 }
2784 }
2785 regs_cc = NEW_RESOURCE_ARRAY(VMRegPair, sig_cc->length() + 2);
2786 return SharedRuntime::java_calling_convention(sig_cc, regs_cc);
2787 }
2788
2789 int CompiledEntrySignature::insert_reserved_entry(GrowableArray<SigEntry>* sig_cc, VMRegPair* regs_cc, int ret_off) {
2790 // Find index in signature that belongs to return address slot
2791 BasicType bt = T_ILLEGAL;
2792 int i = 0;
2793 for (uint off = 0; i < sig_cc->length(); ++i) {
2794 if (SigEntry::skip_value_delimiters(sig_cc, i)) {
2795 VMReg first = regs_cc[off++].first();
2796 if (first->is_valid() && first->is_stack()) {
2797 // Select a type for the reserved entry that will end up on the stack
2798 bt = sig_cc->at(i)._bt;
2799 if (((int)first->reg2stack() + VMRegImpl::slots_per_word) == ret_off) {
2800 break; // Index of the return address found
2801 }
2802 }
2803 }
2804 }
2805 // Insert reserved entry and re-compute calling convention
2806 SigEntry::insert_reserved_entry(sig_cc, i, bt);
2807 return SharedRuntime::java_calling_convention(sig_cc, regs_cc);
2808 }
2809
2810 void CompiledEntrySignature::compute_calling_conventions() {
2811 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
2812 _regs = NEW_RESOURCE_ARRAY(VMRegPair, _sig->length());
2813 _args_on_stack = SharedRuntime::java_calling_convention(_sig, _regs);
2814
2815 // Now compute the scalarized calling convention if there are value types in the signature
2816 _sig_cc = _sig;
2817 _sig_cc_ro = _sig;
2818 _regs_cc = _regs;
2819 _regs_cc_ro = _regs;
2820 _args_on_stack_cc = _args_on_stack;
2821 _args_on_stack_cc_ro = _args_on_stack;
2822
2823 if (ValueTypePassFieldsAsArgs && has_value_arg() && !_method->is_native()) {
2824 _args_on_stack_cc = compute_scalarized_cc(_method, _sig_cc, _regs_cc, /* scalar_receiver = */ true);
2825
2826 _sig_cc_ro = _sig_cc;
2827 _regs_cc_ro = _regs_cc;
2828 _args_on_stack_cc_ro = _args_on_stack_cc;
2829 if (_has_value_recv || _args_on_stack_cc > _args_on_stack) {
2830 // For interface calls, we need another entry point / adapter to unpack the receiver
2831 _args_on_stack_cc_ro = compute_scalarized_cc(_method, _sig_cc_ro, _regs_cc_ro, /* scalar_receiver = */ false);
2832 }
2833
2834 // Compute the stack extension that is required to convert between the calling conventions.
2835 // The stack slots at these offsets are occupied by the return address with the unscalarized
2836 // calling convention. Don't use them for arguments with the scalarized calling convention.
2837 int ret_off = _args_on_stack_cc - _args_on_stack;
2838 int ret_off_ro = _args_on_stack_cc - _args_on_stack_cc_ro;
2839 assert(ret_off_ro <= 0 || ret_off > 0, "receiver unpacking requires more stack space than expected");
2840
2841 if (ret_off > 0) {
2842 // Make sure the stack of the scalarized calling convention with the reserved
2843 // entries (2 slots each) remains 16-byte (4 slots) aligned after stack extension.
2844 int alignment = StackAlignmentInBytes / VMRegImpl::stack_slot_size;
2845 if (ret_off_ro != ret_off && ret_off_ro >= 0) {
2846 ret_off += 4; // Account for two reserved entries (4 slots)
2847 ret_off_ro += 4;
2848 ret_off = align_up(ret_off, alignment);
2849 ret_off_ro = align_up(ret_off_ro, alignment);
2850 // TODO can we avoid wasting a stack slot here?
2851 //assert(ret_off != ret_off_ro, "fail");
2852 if (ret_off > ret_off_ro) {
2853 swap(ret_off, ret_off_ro); // Sort by offset
2854 }
2855 _args_on_stack_cc = insert_reserved_entry(_sig_cc, _regs_cc, ret_off);
2856 _args_on_stack_cc = insert_reserved_entry(_sig_cc, _regs_cc, ret_off_ro);
2857 } else {
2858 ret_off += 2; // Account for one reserved entry (2 slots)
2859 ret_off = align_up(ret_off, alignment);
2860 _args_on_stack_cc = insert_reserved_entry(_sig_cc, _regs_cc, ret_off);
2861 }
2862 }
2863
2864 // Upper bound on stack arguments to avoid hitting the argument limit and
2865 // bailing out of compilation ("unsupported incoming calling sequence").
2866 // TODO we need a reasonable limit (flag?) here
2867 if (_args_on_stack_cc > 50) {
2868 // Don't scalarize value type arguments
2869 _sig_cc = _sig;
2870 _sig_cc_ro = _sig;
2871 _regs_cc = _regs;
2872 _regs_cc_ro = _regs;
2873 _args_on_stack_cc = _args_on_stack;
2874 _args_on_stack_cc_ro = _args_on_stack;
2875 } else {
2876 _c1_needs_stack_repair = (_args_on_stack_cc < _args_on_stack) || (_args_on_stack_cc_ro < _args_on_stack);
2877 _c2_needs_stack_repair = (_args_on_stack_cc > _args_on_stack) || (_args_on_stack_cc > _args_on_stack_cc_ro);
2878 _has_scalarized_args = true;
2879 }
2880 }
2881 }
2882
2883 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter0(const methodHandle& method) {
2884 // Use customized signature handler. Need to lock around updates to
2885 // the AdapterHandlerTable (it is not safe for concurrent readers
2886 // and a single writer: this could be fixed if it becomes a
2887 // problem).
2888
2889 ResourceMark rm;
2890
2891 NOT_PRODUCT(int insts_size = 0);
2892 AdapterBlob* new_adapter = NULL;
2893 AdapterHandlerEntry* entry = NULL;
2894 AdapterFingerPrint* fingerprint = NULL;
2895
2896 {
2897 MutexLocker mu(AdapterHandlerLibrary_lock);
2898 // make sure data structure is initialized
2899 initialize();
2900
2901 CompiledEntrySignature ces(method());
2902 bool has_value_arg = ces.has_value_arg();
2903 GrowableArray<SigEntry>& sig = ces.sig();
2904
2905 // Process abstract method if it has value type args to set has_scalarized_args accordingly
2906 if (method->is_abstract() && !(ValueTypePassFieldsAsArgs && has_value_arg)) {
2907 return _abstract_method_handler;
2908 }
2909
2910 {
2911 MutexUnlocker mul(AdapterHandlerLibrary_lock); // <-- why is this needed?
2912 ces.compute_calling_conventions();
2913 }
2914 GrowableArray<SigEntry>& sig_cc = ces.sig_cc();
2915 GrowableArray<SigEntry>& sig_cc_ro = ces.sig_cc_ro();
2916 VMRegPair* regs = ces.regs();
2917 VMRegPair* regs_cc = ces.regs_cc();
2918 VMRegPair* regs_cc_ro = ces.regs_cc_ro();
2919 int args_on_stack = ces.args_on_stack();
2920 int args_on_stack_cc = ces.args_on_stack_cc();
2921 int args_on_stack_cc_ro = ces.args_on_stack_cc_ro();
2922
2923 if (ces.has_scalarized_args()) {
2924 method->set_has_scalarized_args(true);
2925 method->set_c1_needs_stack_repair(ces.c1_needs_stack_repair());
2926 method->set_c2_needs_stack_repair(ces.c2_needs_stack_repair());
2927 }
2928
2929 if (method->is_abstract()) {
2930 // Save a C heap allocated version of the signature for abstract methods with scalarized value type arguments
2931 assert(ValueTypePassFieldsAsArgs && has_value_arg, "must have scalarized value type args");
2932 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
2933 entry = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(NULL),
2934 StubRoutines::throw_AbstractMethodError_entry(),
2935 wrong_method_abstract, wrong_method_abstract, wrong_method_abstract,
2936 wrong_method_abstract, wrong_method_abstract);
2937 GrowableArray<SigEntry>* heap_sig = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<SigEntry>(sig_cc_ro.length(), true);
2938 heap_sig->appendAll(&sig_cc_ro);
2939 entry->set_sig_cc(heap_sig);
2940 return entry;
2941 }
2942
2943 // Lookup method signature's fingerprint
2944 entry = _adapters->lookup(&sig_cc, regs_cc != regs_cc_ro);
2945
2946 #ifdef ASSERT
2947 AdapterHandlerEntry* shared_entry = NULL;
2948 // Start adapter sharing verification only after the VM is booted.
2949 if (VerifyAdapterSharing && (entry != NULL)) {
2950 shared_entry = entry;
2951 entry = NULL;
2952 }
2953 #endif
2954
2955 if (entry != NULL) {
2956 return entry;
2957 }
2958
2959 // Make a C heap allocated version of the fingerprint to store in the adapter
2960 fingerprint = new AdapterFingerPrint(&sig_cc, regs_cc != regs_cc_ro);
2961
2962 // StubRoutines::code2() is initialized after this function can be called. As a result,
2963 // VerifyAdapterCalls and VerifyAdapterSharing can fail if we re-use code that generated
2964 // prior to StubRoutines::code2() being set. Checks refer to checks generated in an I2C
2965 // stub that ensure that an I2C stub is called from an interpreter frame.
2966 bool contains_all_checks = StubRoutines::code2() != NULL;
2967
2968 // Create I2C & C2I handlers
2969 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2970 if (buf != NULL) {
2971 CodeBuffer buffer(buf);
2972 short buffer_locs[20];
2973 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
2974 sizeof(buffer_locs)/sizeof(relocInfo));
2975
2976 MacroAssembler _masm(&buffer);
2977 entry = SharedRuntime::generate_i2c2i_adapters(&_masm,
2978 args_on_stack,
2979 &sig,
2980 regs,
2981 &sig_cc,
2982 regs_cc,
2983 &sig_cc_ro,
2984 regs_cc_ro,
2985 fingerprint,
2986 new_adapter);
2987
2988 if (regs != regs_cc) {
2989 // Save a C heap allocated version of the scalarized signature and store it in the adapter
2990 GrowableArray<SigEntry>* heap_sig = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<SigEntry>(sig_cc.length(), true);
2991 heap_sig->appendAll(&sig_cc);
2992 entry->set_sig_cc(heap_sig);
2993 }
2994
2995 #ifdef ASSERT
2996 if (VerifyAdapterSharing) {
2997 if (shared_entry != NULL) {
2998 if (!shared_entry->compare_code(buf->code_begin(), buffer.insts_size())) {
2999 method->print();
3000 }
3001 assert(shared_entry->compare_code(buf->code_begin(), buffer.insts_size()), "code must match");
3002 // Release the one just created and return the original
3003 _adapters->free_entry(entry);
3004 return shared_entry;
3005 } else {
3006 entry->save_code(buf->code_begin(), buffer.insts_size());
3007 }
3008 }
3009 #endif
3010
3011 NOT_PRODUCT(insts_size = buffer.insts_size());
3012 }
3013 if (new_adapter == NULL) {
3014 // CodeCache is full, disable compilation
3015 // Ought to log this but compile log is only per compile thread
3016 // and we're some non descript Java thread.
3017 return NULL; // Out of CodeCache space
3018 }
3019 entry->relocate(new_adapter->content_begin());
3020 #ifndef PRODUCT
3021 // debugging suppport
3022 if (PrintAdapterHandlers || PrintStubCode) {
3023 ttyLocker ttyl;
3024 entry->print_adapter_on(tty);
3025 tty->print_cr("i2c argument handler #%d for: %s %s %s (%d bytes generated)",
3026 _adapters->number_of_entries(), (method->is_static() ? "static" : "receiver"),
3027 method->signature()->as_C_string(), fingerprint->as_string(), insts_size);
3028 tty->print_cr("c2i argument handler starts at %p", entry->get_c2i_entry());
3029 if (Verbose || PrintStubCode) {
3030 address first_pc = entry->base_address();
3031 if (first_pc != NULL) {
3032 Disassembler::decode(first_pc, first_pc + insts_size);
3033 tty->cr();
3034 }
3035 }
3036 }
3037 #endif
3038 // Add the entry only if the entry contains all required checks (see sharedRuntime_xxx.cpp)
3039 // The checks are inserted only if -XX:+VerifyAdapterCalls is specified.
3040 if (contains_all_checks || !VerifyAdapterCalls) {
3041 _adapters->add(entry);
3042 }
3043 }
3044 // Outside of the lock
3045 if (new_adapter != NULL) {
3046 char blob_id[256];
3047 jio_snprintf(blob_id,
3048 sizeof(blob_id),
3049 "%s(%s)@" PTR_FORMAT,
3050 new_adapter->name(),
3051 fingerprint->as_string(),
3052 new_adapter->content_begin());
3053 Forte::register_stub(blob_id, new_adapter->content_begin(), new_adapter->content_end());
3054
3055 if (JvmtiExport::should_post_dynamic_code_generated()) {
3056 JvmtiExport::post_dynamic_code_generated(blob_id, new_adapter->content_begin(), new_adapter->content_end());
3057 }
3058 }
3059 return entry;
3060 }
3061
3062 address AdapterHandlerEntry::base_address() {
3063 address base = _i2c_entry;
3064 if (base == NULL) base = _c2i_entry;
3065 assert(base <= _c2i_entry || _c2i_entry == NULL, "");
3066 assert(base <= _c2i_value_entry || _c2i_value_entry == NULL, "");
3067 assert(base <= _c2i_value_ro_entry || _c2i_value_ro_entry == NULL, "");
3068 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == NULL, "");
3069 assert(base <= _c2i_unverified_value_entry || _c2i_unverified_value_entry == NULL, "");
3070 return base;
3071 }
3072
3073 void AdapterHandlerEntry::relocate(address new_base) {
3074 address old_base = base_address();
3075 assert(old_base != NULL, "");
3076 ptrdiff_t delta = new_base - old_base;
3077 if (_i2c_entry != NULL)
3078 _i2c_entry += delta;
3079 if (_c2i_entry != NULL)
3080 _c2i_entry += delta;
3081 if (_c2i_value_entry != NULL)
3082 _c2i_value_entry += delta;
3083 if (_c2i_value_ro_entry != NULL)
3084 _c2i_value_ro_entry += delta;
3085 if (_c2i_unverified_entry != NULL)
3086 _c2i_unverified_entry += delta;
3087 if (_c2i_unverified_value_entry != NULL)
3088 _c2i_unverified_value_entry += delta;
3089 assert(base_address() == new_base, "");
3090 }
3091
3092
3093 void AdapterHandlerEntry::deallocate() {
3094 delete _fingerprint;
3095 if (_sig_cc != NULL) {
3096 delete _sig_cc;
3097 }
3098 #ifdef ASSERT
3099 if (_saved_code) FREE_C_HEAP_ARRAY(unsigned char, _saved_code);
3100 #endif
3101 }
3102
3103
3104 #ifdef ASSERT
3105 // Capture the code before relocation so that it can be compared
3106 // against other versions. If the code is captured after relocation
3107 // then relative instructions won't be equivalent.
3108 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
3109 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
3110 _saved_code_length = length;
3111 memcpy(_saved_code, buffer, length);
3112 }
3113
3114
3115 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length) {
3116 if (length != _saved_code_length) {
3117 return false;
3118 }
3119
3120 return (memcmp(buffer, _saved_code, length) == 0) ? true : false;
3121 }
3122 #endif
3123
3124
3125 /**
3126 * Create a native wrapper for this native method. The wrapper converts the
3127 * Java-compiled calling convention to the native convention, handles
3128 * arguments, and transitions to native. On return from the native we transition
3129 * back to java blocking if a safepoint is in progress.
3130 */
3131 void AdapterHandlerLibrary::create_native_wrapper(const methodHandle& method) {
3132 ResourceMark rm;
3133 nmethod* nm = NULL;
3134
3135 assert(method->is_native(), "must be native");
3136 assert(method->is_method_handle_intrinsic() ||
3137 method->has_native_function(), "must have something valid to call!");
3138
3139 {
3140 // Perform the work while holding the lock, but perform any printing outside the lock
3141 MutexLocker mu(AdapterHandlerLibrary_lock);
3142 // See if somebody beat us to it
3143 if (method->code() != NULL) {
3144 return;
3145 }
3146
3147 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci);
3148 assert(compile_id > 0, "Must generate native wrapper");
3149
3150
3151 ResourceMark rm;
3152 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
3153 if (buf != NULL) {
3154 CodeBuffer buffer(buf);
3155 double locs_buf[20];
3156 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
3157 MacroAssembler _masm(&buffer);
3158
3159 // Fill in the signature array, for the calling-convention call.
3160 const int total_args_passed = method->size_of_parameters();
3161
3162 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
3163 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
3164 int i=0;
3165 if (!method->is_static()) // Pass in receiver first
3166 sig_bt[i++] = T_OBJECT;
3167 SignatureStream ss(method->signature());
3168 for (; !ss.at_return_type(); ss.next()) {
3169 BasicType bt = ss.type();
3170 sig_bt[i++] = bt; // Collect remaining bits of signature
3171 if (ss.type() == T_LONG || ss.type() == T_DOUBLE)
3172 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
3173 }
3174 assert(i == total_args_passed, "");
3175 BasicType ret_type = ss.type();
3176
3177 // Now get the compiled-Java layout as input (or output) arguments.
3178 // NOTE: Stubs for compiled entry points of method handle intrinsics
3179 // are just trampolines so the argument registers must be outgoing ones.
3180 const bool is_outgoing = method->is_method_handle_intrinsic();
3181 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, is_outgoing);
3182
3183 // Generate the compiled-to-native wrapper code
3184 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type);
3185
3186 if (nm != NULL) {
3187 method->set_code(method, nm);
3188
3189 DirectiveSet* directive = DirectivesStack::getDefaultDirective(CompileBroker::compiler(CompLevel_simple));
3190 if (directive->PrintAssemblyOption) {
3191 nm->print_code();
3192 }
3193 DirectivesStack::release(directive);
3194 }
3195 }
3196 } // Unlock AdapterHandlerLibrary_lock
3197
3198
3199 // Install the generated code.
3200 if (nm != NULL) {
3201 const char *msg = method->is_static() ? "(static)" : "";
3202 CompileTask::print_ul(nm, msg);
3203 if (PrintCompilation) {
3204 ttyLocker ttyl;
3205 CompileTask::print(tty, nm, msg);
3206 }
3207 nm->post_compiled_method_load_event();
3208 }
3209 }
3210
3211 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::block_for_jni_critical(JavaThread* thread))
3212 assert(thread == JavaThread::current(), "must be");
3213 // The code is about to enter a JNI lazy critical native method and
3214 // _needs_gc is true, so if this thread is already in a critical
3215 // section then just return, otherwise this thread should block
3216 // until needs_gc has been cleared.
3217 if (thread->in_critical()) {
3218 return;
3219 }
3220 // Lock and unlock a critical section to give the system a chance to block
3221 GCLocker::lock_critical(thread);
3222 GCLocker::unlock_critical(thread);
3223 JRT_END
3224
3225 JRT_LEAF(oopDesc*, SharedRuntime::pin_object(JavaThread* thread, oopDesc* obj))
3226 assert(Universe::heap()->supports_object_pinning(), "Why we are here?");
3227 assert(obj != NULL, "Should not be null");
3228 oop o(obj);
3229 o = Universe::heap()->pin_object(thread, o);
3230 assert(o != NULL, "Should not be null");
3231 return o;
3232 JRT_END
3233
3234 JRT_LEAF(void, SharedRuntime::unpin_object(JavaThread* thread, oopDesc* obj))
3235 assert(Universe::heap()->supports_object_pinning(), "Why we are here?");
3236 assert(obj != NULL, "Should not be null");
3237 oop o(obj);
3238 Universe::heap()->unpin_object(thread, o);
3239 JRT_END
3240
3241 // -------------------------------------------------------------------------
3242 // Java-Java calling convention
3243 // (what you use when Java calls Java)
3244
3245 //------------------------------name_for_receiver----------------------------------
3246 // For a given signature, return the VMReg for parameter 0.
3247 VMReg SharedRuntime::name_for_receiver() {
3248 VMRegPair regs;
3249 BasicType sig_bt = T_OBJECT;
3250 (void) java_calling_convention(&sig_bt, ®s, 1, true);
3251 // Return argument 0 register. In the LP64 build pointers
3252 // take 2 registers, but the VM wants only the 'main' name.
3253 return regs.first();
3254 }
3255
3256 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) {
3257 // This method is returning a data structure allocating as a
3258 // ResourceObject, so do not put any ResourceMarks in here.
3259 char *s = sig->as_C_string();
3260 int len = (int)strlen(s);
3261 s++; len--; // Skip opening paren
3262
3263 BasicType *sig_bt = NEW_RESOURCE_ARRAY(BasicType, 256);
3264 VMRegPair *regs = NEW_RESOURCE_ARRAY(VMRegPair, 256);
3265 int cnt = 0;
3266 if (has_receiver) {
3267 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature
3268 }
3269
3270 while (*s != ')') { // Find closing right paren
3271 switch (*s++) { // Switch on signature character
3272 case 'B': sig_bt[cnt++] = T_BYTE; break;
3273 case 'C': sig_bt[cnt++] = T_CHAR; break;
3274 case 'D': sig_bt[cnt++] = T_DOUBLE; sig_bt[cnt++] = T_VOID; break;
3275 case 'F': sig_bt[cnt++] = T_FLOAT; break;
3276 case 'I': sig_bt[cnt++] = T_INT; break;
3277 case 'J': sig_bt[cnt++] = T_LONG; sig_bt[cnt++] = T_VOID; break;
3278 case 'S': sig_bt[cnt++] = T_SHORT; break;
3279 case 'Z': sig_bt[cnt++] = T_BOOLEAN; break;
3280 case 'V': sig_bt[cnt++] = T_VOID; break;
3281 case 'L': // Oop
3282 while (*s++ != ';'); // Skip signature
3283 sig_bt[cnt++] = T_OBJECT;
3284 break;
3285 case 'Q': // Value type
3286 while (*s++ != ';'); // Skip signature
3287 sig_bt[cnt++] = T_VALUETYPE;
3288 break;
3289 case '[': { // Array
3290 do { // Skip optional size
3291 while (*s >= '0' && *s <= '9') s++;
3292 } while (*s++ == '['); // Nested arrays?
3293 // Skip element type
3294 if (s[-1] == 'L' || s[-1] == 'Q')
3295 while (*s++ != ';'); // Skip signature
3296 sig_bt[cnt++] = T_ARRAY;
3297 break;
3298 }
3299 default : ShouldNotReachHere();
3300 }
3301 }
3302
3303 if (has_appendix) {
3304 sig_bt[cnt++] = T_OBJECT;
3305 }
3306
3307 assert(cnt < 256, "grow table size");
3308
3309 int comp_args_on_stack;
3310 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true);
3311
3312 // the calling convention doesn't count out_preserve_stack_slots so
3313 // we must add that in to get "true" stack offsets.
3314
3315 if (comp_args_on_stack) {
3316 for (int i = 0; i < cnt; i++) {
3317 VMReg reg1 = regs[i].first();
3318 if (reg1->is_stack()) {
3319 // Yuck
3320 reg1 = reg1->bias(out_preserve_stack_slots());
3321 }
3322 VMReg reg2 = regs[i].second();
3323 if (reg2->is_stack()) {
3324 // Yuck
3325 reg2 = reg2->bias(out_preserve_stack_slots());
3326 }
3327 regs[i].set_pair(reg2, reg1);
3328 }
3329 }
3330
3331 // results
3332 *arg_size = cnt;
3333 return regs;
3334 }
3335
3336 // OSR Migration Code
3337 //
3338 // This code is used convert interpreter frames into compiled frames. It is
3339 // called from very start of a compiled OSR nmethod. A temp array is
3340 // allocated to hold the interesting bits of the interpreter frame. All
3341 // active locks are inflated to allow them to move. The displaced headers and
3342 // active interpreter locals are copied into the temp buffer. Then we return
3343 // back to the compiled code. The compiled code then pops the current
3344 // interpreter frame off the stack and pushes a new compiled frame. Then it
3345 // copies the interpreter locals and displaced headers where it wants.
3346 // Finally it calls back to free the temp buffer.
3347 //
3348 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed.
3349
3350 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) )
3351
3352 //
3353 // This code is dependent on the memory layout of the interpreter local
3354 // array and the monitors. On all of our platforms the layout is identical
3355 // so this code is shared. If some platform lays the their arrays out
3356 // differently then this code could move to platform specific code or
3357 // the code here could be modified to copy items one at a time using
3358 // frame accessor methods and be platform independent.
3359
3360 frame fr = thread->last_frame();
3361 assert(fr.is_interpreted_frame(), "");
3362 assert(fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks");
3363
3364 // Figure out how many monitors are active.
3365 int active_monitor_count = 0;
3366 for (BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
3367 kptr < fr.interpreter_frame_monitor_begin();
3368 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
3369 if (kptr->obj() != NULL) active_monitor_count++;
3370 }
3371
3372 // QQQ we could place number of active monitors in the array so that compiled code
3373 // could double check it.
3374
3375 Method* moop = fr.interpreter_frame_method();
3376 int max_locals = moop->max_locals();
3377 // Allocate temp buffer, 1 word per local & 2 per active monitor
3378 int buf_size_words = max_locals + active_monitor_count * BasicObjectLock::size();
3379 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode);
3380
3381 // Copy the locals. Order is preserved so that loading of longs works.
3382 // Since there's no GC I can copy the oops blindly.
3383 assert(sizeof(HeapWord)==sizeof(intptr_t), "fix this code");
3384 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
3385 (HeapWord*)&buf[0],
3386 max_locals);
3387
3388 // Inflate locks. Copy the displaced headers. Be careful, there can be holes.
3389 int i = max_locals;
3390 for (BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();
3391 kptr2 < fr.interpreter_frame_monitor_begin();
3392 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {
3393 if (kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array
3394 BasicLock *lock = kptr2->lock();
3395 // Inflate so the displaced header becomes position-independent
3396 if (lock->displaced_header()->is_unlocked())
3397 ObjectSynchronizer::inflate_helper(kptr2->obj());
3398 // Now the displaced header is free to move
3399 buf[i++] = (intptr_t)lock->displaced_header();
3400 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj());
3401 }
3402 }
3403 assert(i - max_locals == active_monitor_count*2, "found the expected number of monitors");
3404
3405 return buf;
3406 JRT_END
3407
3408 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) )
3409 FREE_C_HEAP_ARRAY(intptr_t, buf);
3410 JRT_END
3411
3412 bool AdapterHandlerLibrary::contains(const CodeBlob* b) {
3413 AdapterHandlerTableIterator iter(_adapters);
3414 while (iter.has_next()) {
3415 AdapterHandlerEntry* a = iter.next();
3416 if (b == CodeCache::find_blob(a->get_i2c_entry())) return true;
3417 }
3418 return false;
3419 }
3420
3421 void AdapterHandlerLibrary::print_handler_on(outputStream* st, const CodeBlob* b) {
3422 AdapterHandlerTableIterator iter(_adapters);
3423 while (iter.has_next()) {
3424 AdapterHandlerEntry* a = iter.next();
3425 if (b == CodeCache::find_blob(a->get_i2c_entry())) {
3426 st->print("Adapter for signature: ");
3427 a->print_adapter_on(tty);
3428 return;
3429 }
3430 }
3431 assert(false, "Should have found handler");
3432 }
3433
3434 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
3435 st->print_cr("AHE@" INTPTR_FORMAT ": %s i2c: " INTPTR_FORMAT " c2i: " INTPTR_FORMAT " c2iVE: " INTPTR_FORMAT
3436 " c2iVROE: " INTPTR_FORMAT " c2iUE: " INTPTR_FORMAT " c2iUVE: " INTPTR_FORMAT,
3437 p2i(this), fingerprint()->as_string(),
3438 p2i(get_i2c_entry()), p2i(get_c2i_entry()), p2i(get_c2i_value_entry()),
3439 p2i(get_c2i_value_ro_entry()), p2i(get_c2i_unverified_entry()), p2i(get_c2i_unverified_value_entry()));
3440
3441 }
3442
3443 #if INCLUDE_CDS
3444
3445 void CDSAdapterHandlerEntry::init() {
3446 assert(DumpSharedSpaces, "used during dump time only");
3447 _c2i_entry_trampoline = (address)MetaspaceShared::misc_code_space_alloc(SharedRuntime::trampoline_size());
3448 _adapter_trampoline = (AdapterHandlerEntry**)MetaspaceShared::misc_code_space_alloc(sizeof(AdapterHandlerEntry*));
3449 };
3450
3451 #endif // INCLUDE_CDS
3452
3453
3454 #ifndef PRODUCT
3455
3456 void AdapterHandlerLibrary::print_statistics() {
3457 _adapters->print_statistics();
3458 }
3459
3460 #endif /* PRODUCT */
3461
3462 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* thread))
3463 assert(thread->is_Java_thread(), "Only Java threads have a stack reserved zone");
3464 if (thread->stack_reserved_zone_disabled()) {
3465 thread->enable_stack_reserved_zone();
3466 }
3467 thread->set_reserved_stack_activation(thread->stack_base());
3468 JRT_END
3469
3470 frame SharedRuntime::look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr) {
3471 ResourceMark rm(thread);
3472 frame activation;
3473 CompiledMethod* nm = NULL;
3474 int count = 1;
3475
3476 assert(fr.is_java_frame(), "Must start on Java frame");
3477
3478 while (true) {
3479 Method* method = NULL;
3480 bool found = false;
3481 if (fr.is_interpreted_frame()) {
3482 method = fr.interpreter_frame_method();
3483 if (method != NULL && method->has_reserved_stack_access()) {
3484 found = true;
3485 }
3486 } else {
3487 CodeBlob* cb = fr.cb();
3488 if (cb != NULL && cb->is_compiled()) {
3489 nm = cb->as_compiled_method();
3490 method = nm->method();
3491 // scope_desc_near() must be used, instead of scope_desc_at() because on
3492 // SPARC, the pcDesc can be on the delay slot after the call instruction.
3493 for (ScopeDesc *sd = nm->scope_desc_near(fr.pc()); sd != NULL; sd = sd->sender()) {
3494 method = sd->method();
3495 if (method != NULL && method->has_reserved_stack_access()) {
3496 found = true;
3497 }
3498 }
3499 }
3500 }
3501 if (found) {
3502 activation = fr;
3503 warning("Potentially dangerous stack overflow in "
3504 "ReservedStackAccess annotated method %s [%d]",
3505 method->name_and_sig_as_C_string(), count++);
3506 EventReservedStackActivation event;
3507 if (event.should_commit()) {
3508 event.set_method(method);
3509 event.commit();
3510 }
3511 }
3512 if (fr.is_first_java_frame()) {
3513 break;
3514 } else {
3515 fr = fr.java_sender();
3516 }
3517 }
3518 return activation;
3519 }
3520
3521 void SharedRuntime::on_slowpath_allocation_exit(JavaThread* thread) {
3522 // After any safepoint, just before going back to compiled code,
3523 // we inform the GC that we will be doing initializing writes to
3524 // this object in the future without emitting card-marks, so
3525 // GC may take any compensating steps.
3526
3527 oop new_obj = thread->vm_result();
3528 if (new_obj == NULL) return;
3529
3530 BarrierSet *bs = BarrierSet::barrier_set();
3531 bs->on_slowpath_allocation_exit(thread, new_obj);
3532 }
3533
3534 // We are at a compiled code to interpreter call. We need backing
3535 // buffers for all value type arguments. Allocate an object array to
3536 // hold them (convenient because once we're done with it we don't have
3537 // to worry about freeing it).
3538 oop SharedRuntime::allocate_value_types_impl(JavaThread* thread, methodHandle callee, bool allocate_receiver, TRAPS) {
3539 assert(ValueTypePassFieldsAsArgs, "no reason to call this");
3540 ResourceMark rm;
3541
3542 int nb_slots = 0;
3543 InstanceKlass* holder = callee->method_holder();
3544 allocate_receiver &= !callee->is_static() && holder->is_value();
3545 if (allocate_receiver) {
3546 nb_slots++;
3547 }
3548 Handle class_loader(THREAD, holder->class_loader());
3549 Handle protection_domain(THREAD, holder->protection_domain());
3550 for (SignatureStream ss(callee->signature()); !ss.at_return_type(); ss.next()) {
3551 if (ss.type() == T_VALUETYPE) {
3552 nb_slots++;
3553 }
3554 }
3555 objArrayOop array_oop = oopFactory::new_objectArray(nb_slots, CHECK_NULL);
3556 objArrayHandle array(THREAD, array_oop);
3557 int i = 0;
3558 if (allocate_receiver) {
3559 ValueKlass* vk = ValueKlass::cast(holder);
3560 oop res = vk->allocate_instance(CHECK_NULL);
3561 array->obj_at_put(i, res);
3562 i++;
3563 }
3564 for (SignatureStream ss(callee->signature()); !ss.at_return_type(); ss.next()) {
3565 if (ss.type() == T_VALUETYPE) {
3566 Klass* k = ss.as_klass(class_loader, protection_domain, SignatureStream::ReturnNull, THREAD);
3567 assert(k != NULL && !HAS_PENDING_EXCEPTION, "can't resolve klass");
3568 ValueKlass* vk = ValueKlass::cast(k);
3569 oop res = vk->allocate_instance(CHECK_NULL);
3570 array->obj_at_put(i, res);
3571 i++;
3572 }
3573 }
3574 return array();
3575 }
3576
3577 JRT_ENTRY(void, SharedRuntime::allocate_value_types(JavaThread* thread, Method* callee_method, bool allocate_receiver))
3578 methodHandle callee(callee_method);
3579 oop array = SharedRuntime::allocate_value_types_impl(thread, callee, allocate_receiver, CHECK);
3580 thread->set_vm_result(array);
3581 thread->set_vm_result_2(callee()); // TODO: required to keep callee live?
3582 JRT_END
3583
3584 // Iterate of the array of heap allocated value types and apply the GC post barrier to all reference fields.
3585 // This is called from the C2I adapter after value type arguments are heap allocated and initialized.
3586 JRT_LEAF(void, SharedRuntime::apply_post_barriers(JavaThread* thread, objArrayOopDesc* array))
3587 {
3588 assert(ValueTypePassFieldsAsArgs, "no reason to call this");
3589 assert(oopDesc::is_oop(array), "should be oop");
3590 for (int i = 0; i < array->length(); ++i) {
3591 instanceOop valueOop = (instanceOop)array->obj_at(i);
3592 ValueKlass* vk = ValueKlass::cast(valueOop->klass());
3593 if (vk->contains_oops()) {
3594 const address dst_oop_addr = ((address) (void*) valueOop);
3595 OopMapBlock* map = vk->start_of_nonstatic_oop_maps();
3596 OopMapBlock* const end = map + vk->nonstatic_oop_map_count();
3597 while (map != end) {
3598 address doop_address = dst_oop_addr + map->offset();
3599 barrier_set_cast<ModRefBarrierSet>(BarrierSet::barrier_set())->
3600 write_ref_array((HeapWord*) doop_address, map->count());
3601 map++;
3602 }
3603 }
3604 }
3605 }
3606 JRT_END
3607
3608 // We're returning from an interpreted method: load each field into a
3609 // register following the calling convention
3610 JRT_LEAF(void, SharedRuntime::load_value_type_fields_in_regs(JavaThread* thread, oopDesc* res))
3611 {
3612 assert(res->klass()->is_value(), "only value types here");
3613 ResourceMark rm;
3614 RegisterMap reg_map(thread);
3615 frame stubFrame = thread->last_frame();
3616 frame callerFrame = stubFrame.sender(®_map);
3617 assert(callerFrame.is_interpreted_frame(), "should be coming from interpreter");
3618
3619 ValueKlass* vk = ValueKlass::cast(res->klass());
3620
3621 const Array<SigEntry>* sig_vk = vk->extended_sig();
3622 const Array<VMRegPair>* regs = vk->return_regs();
3623
3624 if (regs == NULL) {
3625 // The fields of the value klass don't fit in registers, bail out
3626 return;
3627 }
3628
3629 int j = 1;
3630 for (int i = 0; i < sig_vk->length(); i++) {
3631 BasicType bt = sig_vk->at(i)._bt;
3632 if (bt == T_VALUETYPE) {
3633 continue;
3634 }
3635 if (bt == T_VOID) {
3636 if (sig_vk->at(i-1)._bt == T_LONG ||
3637 sig_vk->at(i-1)._bt == T_DOUBLE) {
3638 j++;
3639 }
3640 continue;
3641 }
3642 int off = sig_vk->at(i)._offset;
3643 assert(off > 0, "offset in object should be positive");
3644 VMRegPair pair = regs->at(j);
3645 address loc = reg_map.location(pair.first());
3646 switch(bt) {
3647 case T_BOOLEAN:
3648 *(jboolean*)loc = res->bool_field(off);
3649 break;
3650 case T_CHAR:
3651 *(jchar*)loc = res->char_field(off);
3652 break;
3653 case T_BYTE:
3654 *(jbyte*)loc = res->byte_field(off);
3655 break;
3656 case T_SHORT:
3657 *(jshort*)loc = res->short_field(off);
3658 break;
3659 case T_INT: {
3660 *(jint*)loc = res->int_field(off);
3661 break;
3662 }
3663 case T_LONG:
3664 #ifdef _LP64
3665 *(intptr_t*)loc = res->long_field(off);
3666 #else
3667 Unimplemented();
3668 #endif
3669 break;
3670 case T_OBJECT:
3671 case T_ARRAY: {
3672 *(oop*)loc = res->obj_field(off);
3673 break;
3674 }
3675 case T_FLOAT:
3676 *(jfloat*)loc = res->float_field(off);
3677 break;
3678 case T_DOUBLE:
3679 *(jdouble*)loc = res->double_field(off);
3680 break;
3681 default:
3682 ShouldNotReachHere();
3683 }
3684 j++;
3685 }
3686 assert(j == regs->length(), "missed a field?");
3687
3688 #ifdef ASSERT
3689 VMRegPair pair = regs->at(0);
3690 address loc = reg_map.location(pair.first());
3691 assert(*(oopDesc**)loc == res, "overwritten object");
3692 #endif
3693
3694 thread->set_vm_result(res);
3695 }
3696 JRT_END
3697
3698 // We've returned to an interpreted method, the interpreter needs a
3699 // reference to a value type instance. Allocate it and initialize it
3700 // from field's values in registers.
3701 JRT_BLOCK_ENTRY(void, SharedRuntime::store_value_type_fields_to_buf(JavaThread* thread, intptr_t res))
3702 {
3703 ResourceMark rm;
3704 RegisterMap reg_map(thread);
3705 frame stubFrame = thread->last_frame();
3706 frame callerFrame = stubFrame.sender(®_map);
3707
3708 #ifdef ASSERT
3709 ValueKlass* verif_vk = ValueKlass::returned_value_klass(reg_map);
3710 #endif
3711
3712 if (!is_set_nth_bit(res, 0)) {
3713 // We're not returning with value type fields in registers (the
3714 // calling convention didn't allow it for this value klass)
3715 assert(!Metaspace::contains((void*)res), "should be oop or pointer in buffer area");
3716 thread->set_vm_result((oopDesc*)res);
3717 assert(verif_vk == NULL, "broken calling convention");
3718 return;
3719 }
3720
3721 clear_nth_bit(res, 0);
3722 ValueKlass* vk = (ValueKlass*)res;
3723 assert(verif_vk == vk, "broken calling convention");
3724 assert(Metaspace::contains((void*)res), "should be klass");
3725
3726 // Allocate handles for every oop field so they are safe in case of
3727 // a safepoint when allocating
3728 GrowableArray<Handle> handles;
3729 vk->save_oop_fields(reg_map, handles);
3730
3731 // It's unsafe to safepoint until we are here
3732 JRT_BLOCK;
3733 {
3734 Thread* THREAD = thread;
3735 oop vt = vk->realloc_result(reg_map, handles, CHECK);
3736 thread->set_vm_result(vt);
3737 }
3738 JRT_BLOCK_END;
3739 }
3740 JRT_END
3741