1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "code/compiledIC.hpp"
29 #include "code/scopeDesc.hpp"
30 #include "code/vtableStubs.hpp"
31 #include "compiler/abstractCompiler.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/compilerOracle.hpp"
34 #include "compiler/disassembler.hpp"
35 #include "interpreter/interpreter.hpp"
36 #include "interpreter/interpreterRuntime.hpp"
37 #include "memory/gcLocker.inline.hpp"
38 #include "memory/universe.inline.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "prims/forte.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "prims/jvmtiRedefineClassesTrace.hpp"
43 #include "prims/methodHandles.hpp"
44 #include "prims/nativeLookup.hpp"
45 #include "runtime/arguments.hpp"
46 #include "runtime/biasedLocking.hpp"
47 #include "runtime/handles.inline.hpp"
48 #include "runtime/init.hpp"
49 #include "runtime/interfaceSupport.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "runtime/sharedRuntime.hpp"
52 #include "runtime/stubRoutines.hpp"
53 #include "runtime/vframe.hpp"
54 #include "runtime/vframeArray.hpp"
55 #include "utilities/copy.hpp"
56 #include "utilities/dtrace.hpp"
57 #include "utilities/events.hpp"
58 #include "utilities/hashtable.inline.hpp"
59 #include "utilities/macros.hpp"
60 #include "utilities/xmlstream.hpp"
61 #ifdef TARGET_ARCH_x86
62 # include "nativeInst_x86.hpp"
63 # include "vmreg_x86.inline.hpp"
64 #endif
65 #ifdef TARGET_ARCH_sparc
66 # include "nativeInst_sparc.hpp"
67 # include "vmreg_sparc.inline.hpp"
68 #endif
69 #ifdef TARGET_ARCH_zero
70 # include "nativeInst_zero.hpp"
71 # include "vmreg_zero.inline.hpp"
72 #endif
73 #ifdef TARGET_ARCH_arm
74 # include "nativeInst_arm.hpp"
75 # include "vmreg_arm.inline.hpp"
76 #endif
77 #ifdef TARGET_ARCH_ppc
78 # include "nativeInst_ppc.hpp"
79 # include "vmreg_ppc.inline.hpp"
80 #endif
81 #ifdef COMPILER1
82 #include "c1/c1_Runtime1.hpp"
83 #endif
84
85 // Shared stub locations
86 RuntimeStub* SharedRuntime::_wrong_method_blob;
87 RuntimeStub* SharedRuntime::_ic_miss_blob;
88 RuntimeStub* SharedRuntime::_resolve_opt_virtual_call_blob;
89 RuntimeStub* SharedRuntime::_resolve_virtual_call_blob;
90 RuntimeStub* SharedRuntime::_resolve_static_call_blob;
91
92 DeoptimizationBlob* SharedRuntime::_deopt_blob;
93 SafepointBlob* SharedRuntime::_polling_page_vectors_safepoint_handler_blob;
94 SafepointBlob* SharedRuntime::_polling_page_safepoint_handler_blob;
95 SafepointBlob* SharedRuntime::_polling_page_return_handler_blob;
96
97 #ifdef COMPILER2
98 UncommonTrapBlob* SharedRuntime::_uncommon_trap_blob;
99 #endif // COMPILER2
100
101
102 //----------------------------generate_stubs-----------------------------------
103 void SharedRuntime::generate_stubs() {
104 _wrong_method_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method), "wrong_method_stub");
105 _ic_miss_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss), "ic_miss_stub");
106 _resolve_opt_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C), "resolve_opt_virtual_call");
107 _resolve_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C), "resolve_virtual_call");
108 _resolve_static_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C), "resolve_static_call");
109
110 #ifdef COMPILER2
111 // Vectors are generated only by C2.
112 if (is_wide_vector(MaxVectorSize)) {
113 _polling_page_vectors_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_VECTOR_LOOP);
114 }
115 #endif // COMPILER2
116 _polling_page_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_LOOP);
117 _polling_page_return_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_RETURN);
118
119 generate_deopt_blob();
120
121 #ifdef COMPILER2
122 generate_uncommon_trap_blob();
123 #endif // COMPILER2
124 }
125
126 #include <math.h>
127
128 #ifndef USDT2
129 HS_DTRACE_PROBE_DECL4(hotspot, object__alloc, Thread*, char*, int, size_t);
130 HS_DTRACE_PROBE_DECL7(hotspot, method__entry, int,
131 char*, int, char*, int, char*, int);
132 HS_DTRACE_PROBE_DECL7(hotspot, method__return, int,
133 char*, int, char*, int, char*, int);
134 #endif /* !USDT2 */
135
136 // Implementation of SharedRuntime
137
138 #ifndef PRODUCT
139 // For statistics
140 int SharedRuntime::_ic_miss_ctr = 0;
141 int SharedRuntime::_wrong_method_ctr = 0;
142 int SharedRuntime::_resolve_static_ctr = 0;
143 int SharedRuntime::_resolve_virtual_ctr = 0;
144 int SharedRuntime::_resolve_opt_virtual_ctr = 0;
145 int SharedRuntime::_implicit_null_throws = 0;
146 int SharedRuntime::_implicit_div0_throws = 0;
147 int SharedRuntime::_throw_null_ctr = 0;
148
149 int SharedRuntime::_nof_normal_calls = 0;
150 int SharedRuntime::_nof_optimized_calls = 0;
151 int SharedRuntime::_nof_inlined_calls = 0;
152 int SharedRuntime::_nof_megamorphic_calls = 0;
153 int SharedRuntime::_nof_static_calls = 0;
154 int SharedRuntime::_nof_inlined_static_calls = 0;
155 int SharedRuntime::_nof_interface_calls = 0;
156 int SharedRuntime::_nof_optimized_interface_calls = 0;
157 int SharedRuntime::_nof_inlined_interface_calls = 0;
158 int SharedRuntime::_nof_megamorphic_interface_calls = 0;
159 int SharedRuntime::_nof_removable_exceptions = 0;
160
161 int SharedRuntime::_new_instance_ctr=0;
162 int SharedRuntime::_new_array_ctr=0;
163 int SharedRuntime::_multi1_ctr=0;
164 int SharedRuntime::_multi2_ctr=0;
165 int SharedRuntime::_multi3_ctr=0;
166 int SharedRuntime::_multi4_ctr=0;
167 int SharedRuntime::_multi5_ctr=0;
168 int SharedRuntime::_mon_enter_stub_ctr=0;
169 int SharedRuntime::_mon_exit_stub_ctr=0;
170 int SharedRuntime::_mon_enter_ctr=0;
171 int SharedRuntime::_mon_exit_ctr=0;
172 int SharedRuntime::_partial_subtype_ctr=0;
173 int SharedRuntime::_jbyte_array_copy_ctr=0;
174 int SharedRuntime::_jshort_array_copy_ctr=0;
175 int SharedRuntime::_jint_array_copy_ctr=0;
176 int SharedRuntime::_jlong_array_copy_ctr=0;
177 int SharedRuntime::_oop_array_copy_ctr=0;
178 int SharedRuntime::_checkcast_array_copy_ctr=0;
179 int SharedRuntime::_unsafe_array_copy_ctr=0;
180 int SharedRuntime::_generic_array_copy_ctr=0;
181 int SharedRuntime::_slow_array_copy_ctr=0;
182 int SharedRuntime::_find_handler_ctr=0;
183 int SharedRuntime::_rethrow_ctr=0;
184
185 int SharedRuntime::_ICmiss_index = 0;
186 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count];
187 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count];
188
189
190 void SharedRuntime::trace_ic_miss(address at) {
191 for (int i = 0; i < _ICmiss_index; i++) {
192 if (_ICmiss_at[i] == at) {
193 _ICmiss_count[i]++;
194 return;
195 }
196 }
197 int index = _ICmiss_index++;
198 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1;
199 _ICmiss_at[index] = at;
200 _ICmiss_count[index] = 1;
201 }
202
203 void SharedRuntime::print_ic_miss_histogram() {
204 if (ICMissHistogram) {
205 tty->print_cr ("IC Miss Histogram:");
206 int tot_misses = 0;
207 for (int i = 0; i < _ICmiss_index; i++) {
208 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", _ICmiss_at[i], _ICmiss_count[i]);
209 tot_misses += _ICmiss_count[i];
210 }
211 tty->print_cr ("Total IC misses: %7d", tot_misses);
212 }
213 }
214 #endif // PRODUCT
215
216 #if INCLUDE_ALL_GCS
217
218 // G1 write-barrier pre: executed before a pointer store.
219 JRT_LEAF(void, SharedRuntime::g1_wb_pre(oopDesc* orig, JavaThread *thread))
220 if (orig == NULL) {
221 assert(false, "should be optimized out");
222 return;
223 }
224 assert(orig->is_oop(true /* ignore mark word */), "Error");
225 // store the original value that was in the field reference
226 thread->satb_mark_queue().enqueue(orig);
227 JRT_END
228
229 // G1 write-barrier post: executed after a pointer store.
230 JRT_LEAF(void, SharedRuntime::g1_wb_post(void* card_addr, JavaThread* thread))
231 thread->dirty_card_queue().enqueue(card_addr);
232 JRT_END
233
234 #endif // INCLUDE_ALL_GCS
235
236
237 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x))
238 return x * y;
239 JRT_END
240
241
242 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x))
243 if (x == min_jlong && y == CONST64(-1)) {
244 return x;
245 } else {
246 return x / y;
247 }
248 JRT_END
249
250
251 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x))
252 if (x == min_jlong && y == CONST64(-1)) {
253 return 0;
254 } else {
255 return x % y;
256 }
257 JRT_END
258
259
260 const juint float_sign_mask = 0x7FFFFFFF;
261 const juint float_infinity = 0x7F800000;
262 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF);
263 const julong double_infinity = CONST64(0x7FF0000000000000);
264
265 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y))
266 #ifdef _WIN64
267 // 64-bit Windows on amd64 returns the wrong values for
268 // infinity operands.
269 union { jfloat f; juint i; } xbits, ybits;
270 xbits.f = x;
271 ybits.f = y;
272 // x Mod Infinity == x unless x is infinity
273 if ( ((xbits.i & float_sign_mask) != float_infinity) &&
274 ((ybits.i & float_sign_mask) == float_infinity) ) {
275 return x;
276 }
277 #endif
278 return ((jfloat)fmod((double)x,(double)y));
279 JRT_END
280
281
282 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y))
283 #ifdef _WIN64
284 union { jdouble d; julong l; } xbits, ybits;
285 xbits.d = x;
286 ybits.d = y;
287 // x Mod Infinity == x unless x is infinity
288 if ( ((xbits.l & double_sign_mask) != double_infinity) &&
289 ((ybits.l & double_sign_mask) == double_infinity) ) {
290 return x;
291 }
292 #endif
293 return ((jdouble)fmod((double)x,(double)y));
294 JRT_END
295
296 #ifdef __SOFTFP__
297 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y))
298 return x + y;
299 JRT_END
300
301 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y))
302 return x - y;
303 JRT_END
304
305 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y))
306 return x * y;
307 JRT_END
308
309 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y))
310 return x / y;
311 JRT_END
312
313 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y))
314 return x + y;
315 JRT_END
316
317 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y))
318 return x - y;
319 JRT_END
320
321 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y))
322 return x * y;
323 JRT_END
324
325 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y))
326 return x / y;
327 JRT_END
328
329 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x))
330 return (jfloat)x;
331 JRT_END
332
333 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x))
334 return (jdouble)x;
335 JRT_END
336
337 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x))
338 return (jdouble)x;
339 JRT_END
340
341 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y))
342 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/
343 JRT_END
344
345 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y))
346 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
347 JRT_END
348
349 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y))
350 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */
351 JRT_END
352
353 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y))
354 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
355 JRT_END
356
357 // Functions to return the opposite of the aeabi functions for nan.
358 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(float x, float y))
359 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
360 JRT_END
361
362 JRT_LEAF(int, SharedRuntime::unordered_dcmplt(double x, double y))
363 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
364 JRT_END
365
366 JRT_LEAF(int, SharedRuntime::unordered_fcmple(float x, float y))
367 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
368 JRT_END
369
370 JRT_LEAF(int, SharedRuntime::unordered_dcmple(double x, double y))
371 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
372 JRT_END
373
374 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y))
375 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
376 JRT_END
377
378 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y))
379 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
380 JRT_END
381
382 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y))
383 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
384 JRT_END
385
386 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y))
387 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
388 JRT_END
389
390 // Intrinsics make gcc generate code for these.
391 float SharedRuntime::fneg(float f) {
392 return -f;
393 }
394
395 double SharedRuntime::dneg(double f) {
396 return -f;
397 }
398
399 #endif // __SOFTFP__
400
401 #if defined(__SOFTFP__) || defined(E500V2)
402 // Intrinsics make gcc generate code for these.
403 double SharedRuntime::dabs(double f) {
404 return (f <= (double)0.0) ? (double)0.0 - f : f;
405 }
406
407 #endif
408
409 #if defined(__SOFTFP__) || defined(PPC)
410 double SharedRuntime::dsqrt(double f) {
411 return sqrt(f);
412 }
413 #endif
414
415 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x))
416 if (g_isnan(x))
417 return 0;
418 if (x >= (jfloat) max_jint)
419 return max_jint;
420 if (x <= (jfloat) min_jint)
421 return min_jint;
422 return (jint) x;
423 JRT_END
424
425
426 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x))
427 if (g_isnan(x))
428 return 0;
429 if (x >= (jfloat) max_jlong)
430 return max_jlong;
431 if (x <= (jfloat) min_jlong)
432 return min_jlong;
433 return (jlong) x;
434 JRT_END
435
436
437 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x))
438 if (g_isnan(x))
439 return 0;
440 if (x >= (jdouble) max_jint)
441 return max_jint;
442 if (x <= (jdouble) min_jint)
443 return min_jint;
444 return (jint) x;
445 JRT_END
446
447
448 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x))
449 if (g_isnan(x))
450 return 0;
451 if (x >= (jdouble) max_jlong)
452 return max_jlong;
453 if (x <= (jdouble) min_jlong)
454 return min_jlong;
455 return (jlong) x;
456 JRT_END
457
458
459 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x))
460 return (jfloat)x;
461 JRT_END
462
463
464 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x))
465 return (jfloat)x;
466 JRT_END
467
468
469 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x))
470 return (jdouble)x;
471 JRT_END
472
473 // Exception handling accross interpreter/compiler boundaries
474 //
475 // exception_handler_for_return_address(...) returns the continuation address.
476 // The continuation address is the entry point of the exception handler of the
477 // previous frame depending on the return address.
478
479 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* thread, address return_address) {
480 assert(frame::verify_return_pc(return_address), err_msg("must be a return address: " INTPTR_FORMAT, return_address));
481
482 // Reset method handle flag.
483 thread->set_is_method_handle_return(false);
484
485 // The fastest case first
486 CodeBlob* blob = CodeCache::find_blob(return_address);
487 nmethod* nm = (blob != NULL) ? blob->as_nmethod_or_null() : NULL;
488 if (nm != NULL) {
489 // Set flag if return address is a method handle call site.
490 thread->set_is_method_handle_return(nm->is_method_handle_return(return_address));
491 // native nmethods don't have exception handlers
492 assert(!nm->is_native_method(), "no exception handler");
493 assert(nm->header_begin() != nm->exception_begin(), "no exception handler");
494 if (nm->is_deopt_pc(return_address)) {
495 return SharedRuntime::deopt_blob()->unpack_with_exception();
496 } else {
497 return nm->exception_begin();
498 }
499 }
500
501 // Entry code
502 if (StubRoutines::returns_to_call_stub(return_address)) {
503 return StubRoutines::catch_exception_entry();
504 }
505 // Interpreted code
506 if (Interpreter::contains(return_address)) {
507 return Interpreter::rethrow_exception_entry();
508 }
509
510 guarantee(blob == NULL || !blob->is_runtime_stub(), "caller should have skipped stub");
511 guarantee(!VtableStubs::contains(return_address), "NULL exceptions in vtables should have been handled already!");
512
513 #ifndef PRODUCT
514 { ResourceMark rm;
515 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", return_address);
516 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here");
517 tty->print_cr("b) other problem");
518 }
519 #endif // PRODUCT
520
521 ShouldNotReachHere();
522 return NULL;
523 }
524
525
526 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* thread, address return_address))
527 return raw_exception_handler_for_return_address(thread, return_address);
528 JRT_END
529
530
531 address SharedRuntime::get_poll_stub(address pc) {
532 address stub;
533 // Look up the code blob
534 CodeBlob *cb = CodeCache::find_blob(pc);
535
536 // Should be an nmethod
537 assert( cb && cb->is_nmethod(), "safepoint polling: pc must refer to an nmethod" );
538
539 // Look up the relocation information
540 assert( ((nmethod*)cb)->is_at_poll_or_poll_return(pc),
541 "safepoint polling: type must be poll" );
542
543 assert( ((NativeInstruction*)pc)->is_safepoint_poll(),
544 "Only polling locations are used for safepoint");
545
546 bool at_poll_return = ((nmethod*)cb)->is_at_poll_return(pc);
547 bool has_wide_vectors = ((nmethod*)cb)->has_wide_vectors();
548 if (at_poll_return) {
549 assert(SharedRuntime::polling_page_return_handler_blob() != NULL,
550 "polling page return stub not created yet");
551 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();
552 } else if (has_wide_vectors) {
553 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != NULL,
554 "polling page vectors safepoint stub not created yet");
555 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point();
556 } else {
557 assert(SharedRuntime::polling_page_safepoint_handler_blob() != NULL,
558 "polling page safepoint stub not created yet");
559 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point();
560 }
561 #ifndef PRODUCT
562 if( TraceSafepoint ) {
563 char buf[256];
564 jio_snprintf(buf, sizeof(buf),
565 "... found polling page %s exception at pc = "
566 INTPTR_FORMAT ", stub =" INTPTR_FORMAT,
567 at_poll_return ? "return" : "loop",
568 (intptr_t)pc, (intptr_t)stub);
569 tty->print_raw_cr(buf);
570 }
571 #endif // PRODUCT
572 return stub;
573 }
574
575
576 oop SharedRuntime::retrieve_receiver( Symbol* sig, frame caller ) {
577 assert(caller.is_interpreted_frame(), "");
578 int args_size = ArgumentSizeComputer(sig).size() + 1;
579 assert(args_size <= caller.interpreter_frame_expression_stack_size(), "receiver must be on interpreter stack");
580 oop result = (oop) *caller.interpreter_frame_tos_at(args_size - 1);
581 assert(Universe::heap()->is_in(result) && result->is_oop(), "receiver must be an oop");
582 return result;
583 }
584
585
586 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception) {
587 if (JvmtiExport::can_post_on_exceptions()) {
588 vframeStream vfst(thread, true);
589 methodHandle method = methodHandle(thread, vfst.method());
590 address bcp = method()->bcp_from(vfst.bci());
591 JvmtiExport::post_exception_throw(thread, method(), bcp, h_exception());
592 }
593 Exceptions::_throw(thread, __FILE__, __LINE__, h_exception);
594 }
595
596 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message) {
597 Handle h_exception = Exceptions::new_exception(thread, name, message);
598 throw_and_post_jvmti_exception(thread, h_exception);
599 }
600
601 // The interpreter code to call this tracing function is only
602 // called/generated when TraceRedefineClasses has the right bits
603 // set. Since obsolete methods are never compiled, we don't have
604 // to modify the compilers to generate calls to this function.
605 //
606 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry(
607 JavaThread* thread, Method* method))
608 assert(RC_TRACE_IN_RANGE(0x00001000, 0x00002000), "wrong call");
609
610 if (method->is_obsolete()) {
611 // We are calling an obsolete method, but this is not necessarily
612 // an error. Our method could have been redefined just after we
613 // fetched the Method* from the constant pool.
614
615 // RC_TRACE macro has an embedded ResourceMark
616 RC_TRACE_WITH_THREAD(0x00001000, thread,
617 ("calling obsolete method '%s'",
618 method->name_and_sig_as_C_string()));
619 if (RC_TRACE_ENABLED(0x00002000)) {
620 // this option is provided to debug calls to obsolete methods
621 guarantee(false, "faulting at call to an obsolete method.");
622 }
623 }
624 return 0;
625 JRT_END
626
627 // ret_pc points into caller; we are returning caller's exception handler
628 // for given exception
629 address SharedRuntime::compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
630 bool force_unwind, bool top_frame_only) {
631 assert(nm != NULL, "must exist");
632 ResourceMark rm;
633
634 ScopeDesc* sd = nm->scope_desc_at(ret_pc);
635 // determine handler bci, if any
636 EXCEPTION_MARK;
637
638 int handler_bci = -1;
639 int scope_depth = 0;
640 if (!force_unwind) {
641 int bci = sd->bci();
642 bool recursive_exception = false;
643 do {
644 bool skip_scope_increment = false;
645 // exception handler lookup
646 KlassHandle ek (THREAD, exception->klass());
647 methodHandle mh(THREAD, sd->method());
648 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD);
649 if (HAS_PENDING_EXCEPTION) {
650 recursive_exception = true;
651 // We threw an exception while trying to find the exception handler.
652 // Transfer the new exception to the exception handle which will
653 // be set into thread local storage, and do another lookup for an
654 // exception handler for this exception, this time starting at the
655 // BCI of the exception handler which caused the exception to be
656 // thrown (bugs 4307310 and 4546590). Set "exception" reference
657 // argument to ensure that the correct exception is thrown (4870175).
658 exception = Handle(THREAD, PENDING_EXCEPTION);
659 CLEAR_PENDING_EXCEPTION;
660 if (handler_bci >= 0) {
661 bci = handler_bci;
662 handler_bci = -1;
663 skip_scope_increment = true;
664 }
665 }
666 else {
667 recursive_exception = false;
668 }
669 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) {
670 sd = sd->sender();
671 if (sd != NULL) {
672 bci = sd->bci();
673 }
674 ++scope_depth;
675 }
676 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != NULL));
677 }
678
679 // found handling method => lookup exception handler
680 int catch_pco = ret_pc - nm->code_begin();
681
682 ExceptionHandlerTable table(nm);
683 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth);
684 if (t == NULL && (nm->is_compiled_by_c1() || handler_bci != -1)) {
685 // Allow abbreviated catch tables. The idea is to allow a method
686 // to materialize its exceptions without committing to the exact
687 // routing of exceptions. In particular this is needed for adding
688 // a synthethic handler to unlock monitors when inlining
689 // synchonized methods since the unlock path isn't represented in
690 // the bytecodes.
691 t = table.entry_for(catch_pco, -1, 0);
692 }
693
694 #ifdef COMPILER1
695 if (t == NULL && nm->is_compiled_by_c1()) {
696 assert(nm->unwind_handler_begin() != NULL, "");
697 return nm->unwind_handler_begin();
698 }
699 #endif
700
701 if (t == NULL) {
702 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d", ret_pc, handler_bci);
703 tty->print_cr(" Exception:");
704 exception->print();
705 tty->cr();
706 tty->print_cr(" Compiled exception table :");
707 table.print();
708 nm->print_code();
709 guarantee(false, "missing exception handler");
710 return NULL;
711 }
712
713 return nm->code_begin() + t->pco();
714 }
715
716 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* thread))
717 // These errors occur only at call sites
718 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError());
719 JRT_END
720
721 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
722 // These errors occur only at call sites
723 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub");
724 JRT_END
725
726 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread))
727 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
728 JRT_END
729
730 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* thread))
731 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
732 JRT_END
733
734 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* thread))
735 // This entry point is effectively only used for NullPointerExceptions which occur at inline
736 // cache sites (when the callee activation is not yet set up) so we are at a call site
737 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
738 JRT_END
739
740 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread))
741 // We avoid using the normal exception construction in this case because
742 // it performs an upcall to Java, and we're already out of stack space.
743 Klass* k = SystemDictionary::StackOverflowError_klass();
744 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK);
745 Handle exception (thread, exception_oop);
746 if (StackTraceInThrowable) {
747 java_lang_Throwable::fill_in_stack_trace(exception);
748 }
749 throw_and_post_jvmti_exception(thread, exception);
750 JRT_END
751
752 address SharedRuntime::continuation_for_implicit_exception(JavaThread* thread,
753 address pc,
754 SharedRuntime::ImplicitExceptionKind exception_kind)
755 {
756 address target_pc = NULL;
757
758 if (Interpreter::contains(pc)) {
759 #ifdef CC_INTERP
760 // C++ interpreter doesn't throw implicit exceptions
761 ShouldNotReachHere();
762 #else
763 switch (exception_kind) {
764 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry();
765 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry();
766 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry();
767 default: ShouldNotReachHere();
768 }
769 #endif // !CC_INTERP
770 } else {
771 switch (exception_kind) {
772 case STACK_OVERFLOW: {
773 // Stack overflow only occurs upon frame setup; the callee is
774 // going to be unwound. Dispatch to a shared runtime stub
775 // which will cause the StackOverflowError to be fabricated
776 // and processed.
777 // For stack overflow in deoptimization blob, cleanup thread.
778 if (thread->deopt_mark() != NULL) {
779 Deoptimization::cleanup_deopt_info(thread, NULL);
780 }
781 Events::log_exception(thread, "StackOverflowError at " INTPTR_FORMAT, pc);
782 return StubRoutines::throw_StackOverflowError_entry();
783 }
784
785 case IMPLICIT_NULL: {
786 if (VtableStubs::contains(pc)) {
787 // We haven't yet entered the callee frame. Fabricate an
788 // exception and begin dispatching it in the caller. Since
789 // the caller was at a call site, it's safe to destroy all
790 // caller-saved registers, as these entry points do.
791 VtableStub* vt_stub = VtableStubs::stub_containing(pc);
792
793 // If vt_stub is NULL, then return NULL to signal handler to report the SEGV error.
794 if (vt_stub == NULL) return NULL;
795
796 if (vt_stub->is_abstract_method_error(pc)) {
797 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs");
798 Events::log_exception(thread, "AbstractMethodError at " INTPTR_FORMAT, pc);
799 return StubRoutines::throw_AbstractMethodError_entry();
800 } else {
801 Events::log_exception(thread, "NullPointerException at vtable entry " INTPTR_FORMAT, pc);
802 return StubRoutines::throw_NullPointerException_at_call_entry();
803 }
804 } else {
805 CodeBlob* cb = CodeCache::find_blob(pc);
806
807 // If code blob is NULL, then return NULL to signal handler to report the SEGV error.
808 if (cb == NULL) return NULL;
809
810 // Exception happened in CodeCache. Must be either:
811 // 1. Inline-cache check in C2I handler blob,
812 // 2. Inline-cache check in nmethod, or
813 // 3. Implict null exception in nmethod
814
815 if (!cb->is_nmethod()) {
816 guarantee(cb->is_adapter_blob() || cb->is_method_handles_adapter_blob(),
817 "exception happened outside interpreter, nmethods and vtable stubs (1)");
818 Events::log_exception(thread, "NullPointerException in code blob at " INTPTR_FORMAT, pc);
819 // There is no handler here, so we will simply unwind.
820 return StubRoutines::throw_NullPointerException_at_call_entry();
821 }
822
823 // Otherwise, it's an nmethod. Consult its exception handlers.
824 nmethod* nm = (nmethod*)cb;
825 if (nm->inlinecache_check_contains(pc)) {
826 // exception happened inside inline-cache check code
827 // => the nmethod is not yet active (i.e., the frame
828 // is not set up yet) => use return address pushed by
829 // caller => don't push another return address
830 Events::log_exception(thread, "NullPointerException in IC check " INTPTR_FORMAT, pc);
831 return StubRoutines::throw_NullPointerException_at_call_entry();
832 }
833
834 if (nm->method()->is_method_handle_intrinsic()) {
835 // exception happened inside MH dispatch code, similar to a vtable stub
836 Events::log_exception(thread, "NullPointerException in MH adapter " INTPTR_FORMAT, pc);
837 return StubRoutines::throw_NullPointerException_at_call_entry();
838 }
839
840 #ifndef PRODUCT
841 _implicit_null_throws++;
842 #endif
843 target_pc = nm->continuation_for_implicit_exception(pc);
844 // If there's an unexpected fault, target_pc might be NULL,
845 // in which case we want to fall through into the normal
846 // error handling code.
847 }
848
849 break; // fall through
850 }
851
852
853 case IMPLICIT_DIVIDE_BY_ZERO: {
854 nmethod* nm = CodeCache::find_nmethod(pc);
855 guarantee(nm != NULL, "must have containing nmethod for implicit division-by-zero exceptions");
856 #ifndef PRODUCT
857 _implicit_div0_throws++;
858 #endif
859 target_pc = nm->continuation_for_implicit_exception(pc);
860 // If there's an unexpected fault, target_pc might be NULL,
861 // in which case we want to fall through into the normal
862 // error handling code.
863 break; // fall through
864 }
865
866 default: ShouldNotReachHere();
867 }
868
869 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind");
870
871 // for AbortVMOnException flag
872 NOT_PRODUCT(Exceptions::debug_check_abort("java.lang.NullPointerException"));
873 if (exception_kind == IMPLICIT_NULL) {
874 Events::log_exception(thread, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc);
875 } else {
876 Events::log_exception(thread, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc);
877 }
878 return target_pc;
879 }
880
881 ShouldNotReachHere();
882 return NULL;
883 }
884
885
886 /**
887 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is
888 * installed in the native function entry of all native Java methods before
889 * they get linked to their actual native methods.
890 *
891 * \note
892 * This method actually never gets called! The reason is because
893 * the interpreter's native entries call NativeLookup::lookup() which
894 * throws the exception when the lookup fails. The exception is then
895 * caught and forwarded on the return from NativeLookup::lookup() call
896 * before the call to the native function. This might change in the future.
897 */
898 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...))
899 {
900 // We return a bad value here to make sure that the exception is
901 // forwarded before we look at the return value.
902 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badJNIHandle);
903 }
904 JNI_END
905
906 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
907 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
908 }
909
910
911 #ifndef PRODUCT
912 JRT_ENTRY(intptr_t, SharedRuntime::trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
913 const frame f = thread->last_frame();
914 assert(f.is_interpreted_frame(), "must be an interpreted frame");
915 #ifndef PRODUCT
916 methodHandle mh(THREAD, f.interpreter_frame_method());
917 BytecodeTracer::trace(mh, f.interpreter_frame_bcp(), tos, tos2);
918 #endif // !PRODUCT
919 return preserve_this_value;
920 JRT_END
921 #endif // !PRODUCT
922
923
924 JRT_ENTRY(void, SharedRuntime::yield_all(JavaThread* thread, int attempts))
925 os::yield_all(attempts);
926 JRT_END
927
928
929 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
930 assert(obj->is_oop(), "must be a valid oop");
931 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
932 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
933 JRT_END
934
935
936 jlong SharedRuntime::get_java_tid(Thread* thread) {
937 if (thread != NULL) {
938 if (thread->is_Java_thread()) {
939 oop obj = ((JavaThread*)thread)->threadObj();
940 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj);
941 }
942 }
943 return 0;
944 }
945
946 /**
947 * This function ought to be a void function, but cannot be because
948 * it gets turned into a tail-call on sparc, which runs into dtrace bug
949 * 6254741. Once that is fixed we can remove the dummy return value.
950 */
951 int SharedRuntime::dtrace_object_alloc(oopDesc* o) {
952 return dtrace_object_alloc_base(Thread::current(), o);
953 }
954
955 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o) {
956 assert(DTraceAllocProbes, "wrong call");
957 Klass* klass = o->klass();
958 int size = o->size();
959 Symbol* name = klass->name();
960 #ifndef USDT2
961 HS_DTRACE_PROBE4(hotspot, object__alloc, get_java_tid(thread),
962 name->bytes(), name->utf8_length(), size * HeapWordSize);
963 #else /* USDT2 */
964 HOTSPOT_OBJECT_ALLOC(
965 get_java_tid(thread),
966 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize);
967 #endif /* USDT2 */
968 return 0;
969 }
970
971 JRT_LEAF(int, SharedRuntime::dtrace_method_entry(
972 JavaThread* thread, Method* method))
973 assert(DTraceMethodProbes, "wrong call");
974 Symbol* kname = method->klass_name();
975 Symbol* name = method->name();
976 Symbol* sig = method->signature();
977 #ifndef USDT2
978 HS_DTRACE_PROBE7(hotspot, method__entry, get_java_tid(thread),
979 kname->bytes(), kname->utf8_length(),
980 name->bytes(), name->utf8_length(),
981 sig->bytes(), sig->utf8_length());
982 #else /* USDT2 */
983 HOTSPOT_METHOD_ENTRY(
984 get_java_tid(thread),
985 (char *) kname->bytes(), kname->utf8_length(),
986 (char *) name->bytes(), name->utf8_length(),
987 (char *) sig->bytes(), sig->utf8_length());
988 #endif /* USDT2 */
989 return 0;
990 JRT_END
991
992 JRT_LEAF(int, SharedRuntime::dtrace_method_exit(
993 JavaThread* thread, Method* method))
994 assert(DTraceMethodProbes, "wrong call");
995 Symbol* kname = method->klass_name();
996 Symbol* name = method->name();
997 Symbol* sig = method->signature();
998 #ifndef USDT2
999 HS_DTRACE_PROBE7(hotspot, method__return, get_java_tid(thread),
1000 kname->bytes(), kname->utf8_length(),
1001 name->bytes(), name->utf8_length(),
1002 sig->bytes(), sig->utf8_length());
1003 #else /* USDT2 */
1004 HOTSPOT_METHOD_RETURN(
1005 get_java_tid(thread),
1006 (char *) kname->bytes(), kname->utf8_length(),
1007 (char *) name->bytes(), name->utf8_length(),
1008 (char *) sig->bytes(), sig->utf8_length());
1009 #endif /* USDT2 */
1010 return 0;
1011 JRT_END
1012
1013
1014 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode)
1015 // for a call current in progress, i.e., arguments has been pushed on stack
1016 // put callee has not been invoked yet. Used by: resolve virtual/static,
1017 // vtable updates, etc. Caller frame must be compiled.
1018 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) {
1019 ResourceMark rm(THREAD);
1020
1021 // last java frame on stack (which includes native call frames)
1022 vframeStream vfst(thread, true); // Do not skip and javaCalls
1023
1024 return find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(Handle()));
1025 }
1026
1027
1028 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
1029 // for a call current in progress, i.e., arguments has been pushed on stack
1030 // but callee has not been invoked yet. Caller frame must be compiled.
1031 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread,
1032 vframeStream& vfst,
1033 Bytecodes::Code& bc,
1034 CallInfo& callinfo, TRAPS) {
1035 Handle receiver;
1036 Handle nullHandle; //create a handy null handle for exception returns
1037
1038 assert(!vfst.at_end(), "Java frame must exist");
1039
1040 // Find caller and bci from vframe
1041 methodHandle caller(THREAD, vfst.method());
1042 int bci = vfst.bci();
1043
1044 // Find bytecode
1045 Bytecode_invoke bytecode(caller, bci);
1046 bc = bytecode.invoke_code();
1047 int bytecode_index = bytecode.index();
1048
1049 // Find receiver for non-static call
1050 if (bc != Bytecodes::_invokestatic &&
1051 bc != Bytecodes::_invokedynamic) {
1052 // This register map must be update since we need to find the receiver for
1053 // compiled frames. The receiver might be in a register.
1054 RegisterMap reg_map2(thread);
1055 frame stubFrame = thread->last_frame();
1056 // Caller-frame is a compiled frame
1057 frame callerFrame = stubFrame.sender(®_map2);
1058
1059 methodHandle callee = bytecode.static_target(CHECK_(nullHandle));
1060 if (callee.is_null()) {
1061 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1062 }
1063 // Retrieve from a compiled argument list
1064 receiver = Handle(THREAD, callerFrame.retrieve_receiver(®_map2));
1065
1066 if (receiver.is_null()) {
1067 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1068 }
1069 }
1070
1071 // Resolve method. This is parameterized by bytecode.
1072 constantPoolHandle constants(THREAD, caller->constants());
1073 assert(receiver.is_null() || receiver->is_oop(), "wrong receiver");
1074 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_(nullHandle));
1075
1076 #ifdef ASSERT
1077 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1078 if (bc != Bytecodes::_invokestatic && bc != Bytecodes::_invokedynamic) {
1079 assert(receiver.not_null(), "should have thrown exception");
1080 KlassHandle receiver_klass(THREAD, receiver->klass());
1081 Klass* rk = constants->klass_ref_at(bytecode_index, CHECK_(nullHandle));
1082 // klass is already loaded
1083 KlassHandle static_receiver_klass(THREAD, rk);
1084 // Method handle invokes might have been optimized to a direct call
1085 // so don't check for the receiver class.
1086 // FIXME this weakens the assert too much
1087 methodHandle callee = callinfo.selected_method();
1088 assert(receiver_klass->is_subtype_of(static_receiver_klass()) ||
1089 callee->is_method_handle_intrinsic() ||
1090 callee->is_compiled_lambda_form(),
1091 "actual receiver must be subclass of static receiver klass");
1092 if (receiver_klass->oop_is_instance()) {
1093 if (InstanceKlass::cast(receiver_klass())->is_not_initialized()) {
1094 tty->print_cr("ERROR: Klass not yet initialized!!");
1095 receiver_klass()->print();
1096 }
1097 assert(!InstanceKlass::cast(receiver_klass())->is_not_initialized(), "receiver_klass must be initialized");
1098 }
1099 }
1100 #endif
1101
1102 return receiver;
1103 }
1104
1105 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) {
1106 ResourceMark rm(THREAD);
1107 // We need first to check if any Java activations (compiled, interpreted)
1108 // exist on the stack since last JavaCall. If not, we need
1109 // to get the target method from the JavaCall wrapper.
1110 vframeStream vfst(thread, true); // Do not skip any javaCalls
1111 methodHandle callee_method;
1112 if (vfst.at_end()) {
1113 // No Java frames were found on stack since we did the JavaCall.
1114 // Hence the stack can only contain an entry_frame. We need to
1115 // find the target method from the stub frame.
1116 RegisterMap reg_map(thread, false);
1117 frame fr = thread->last_frame();
1118 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1119 fr = fr.sender(®_map);
1120 assert(fr.is_entry_frame(), "must be");
1121 // fr is now pointing to the entry frame.
1122 callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method());
1123 assert(fr.entry_frame_call_wrapper()->receiver() == NULL || !callee_method->is_static(), "non-null receiver for static call??");
1124 } else {
1125 Bytecodes::Code bc;
1126 CallInfo callinfo;
1127 find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle()));
1128 callee_method = callinfo.selected_method();
1129 }
1130 assert(callee_method()->is_method(), "must be");
1131 return callee_method;
1132 }
1133
1134 // Resolves a call.
1135 methodHandle SharedRuntime::resolve_helper(JavaThread *thread,
1136 bool is_virtual,
1137 bool is_optimized, TRAPS) {
1138 methodHandle callee_method;
1139 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1140 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
1141 int retry_count = 0;
1142 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() &&
1143 callee_method->method_holder() != SystemDictionary::Object_klass()) {
1144 // If has a pending exception then there is no need to re-try to
1145 // resolve this method.
1146 // If the method has been redefined, we need to try again.
1147 // Hack: we have no way to update the vtables of arrays, so don't
1148 // require that java.lang.Object has been updated.
1149
1150 // It is very unlikely that method is redefined more than 100 times
1151 // in the middle of resolve. If it is looping here more than 100 times
1152 // means then there could be a bug here.
1153 guarantee((retry_count++ < 100),
1154 "Could not resolve to latest version of redefined method");
1155 // method is redefined in the middle of resolve so re-try.
1156 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1157 }
1158 }
1159 return callee_method;
1160 }
1161
1162 // Resolves a call. The compilers generate code for calls that go here
1163 // and are patched with the real destination of the call.
1164 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread,
1165 bool is_virtual,
1166 bool is_optimized, TRAPS) {
1167
1168 ResourceMark rm(thread);
1169 RegisterMap cbl_map(thread, false);
1170 frame caller_frame = thread->last_frame().sender(&cbl_map);
1171
1172 CodeBlob* caller_cb = caller_frame.cb();
1173 guarantee(caller_cb != NULL && caller_cb->is_nmethod(), "must be called from nmethod");
1174 nmethod* caller_nm = caller_cb->as_nmethod_or_null();
1175 // make sure caller is not getting deoptimized
1176 // and removed before we are done with it.
1177 // CLEANUP - with lazy deopt shouldn't need this lock
1178 nmethodLocker caller_lock(caller_nm);
1179
1180
1181 // determine call info & receiver
1182 // note: a) receiver is NULL for static calls
1183 // b) an exception is thrown if receiver is NULL for non-static calls
1184 CallInfo call_info;
1185 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1186 Handle receiver = find_callee_info(thread, invoke_code,
1187 call_info, CHECK_(methodHandle()));
1188 methodHandle callee_method = call_info.selected_method();
1189
1190 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1191 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1192 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1193 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1194
1195 #ifndef PRODUCT
1196 // tracing/debugging/statistics
1197 int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
1198 (is_virtual) ? (&_resolve_virtual_ctr) :
1199 (&_resolve_static_ctr);
1200 Atomic::inc(addr);
1201
1202 if (TraceCallFixup) {
1203 ResourceMark rm(thread);
1204 tty->print("resolving %s%s (%s) call to",
1205 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
1206 Bytecodes::name(invoke_code));
1207 callee_method->print_short_name(tty);
1208 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT, caller_frame.pc(), callee_method->code());
1209 }
1210 #endif
1211
1212 // JSR 292 key invariant:
1213 // If the resolved method is a MethodHandle invoke target the call
1214 // site must be a MethodHandle call site, because the lambda form might tail-call
1215 // leaving the stack in a state unknown to either caller or callee
1216 // TODO detune for now but we might need it again
1217 // assert(!callee_method->is_compiled_lambda_form() ||
1218 // caller_nm->is_method_handle_return(caller_frame.pc()), "must be MH call site");
1219
1220 // Compute entry points. This might require generation of C2I converter
1221 // frames, so we cannot be holding any locks here. Furthermore, the
1222 // computation of the entry points is independent of patching the call. We
1223 // always return the entry-point, but we only patch the stub if the call has
1224 // not been deoptimized. Return values: For a virtual call this is an
1225 // (cached_oop, destination address) pair. For a static call/optimized
1226 // virtual this is just a destination address.
1227
1228 StaticCallInfo static_call_info;
1229 CompiledICInfo virtual_call_info;
1230
1231 // Make sure the callee nmethod does not get deoptimized and removed before
1232 // we are done patching the code.
1233 nmethod* callee_nm = callee_method->code();
1234 nmethodLocker nl_callee(callee_nm);
1235 #ifdef ASSERT
1236 address dest_entry_point = callee_nm == NULL ? 0 : callee_nm->entry_point(); // used below
1237 #endif
1238
1239 if (is_virtual) {
1240 assert(receiver.not_null(), "sanity check");
1241 bool static_bound = call_info.resolved_method()->can_be_statically_bound();
1242 KlassHandle h_klass(THREAD, receiver->klass());
1243 CompiledIC::compute_monomorphic_entry(callee_method, h_klass,
1244 is_optimized, static_bound, virtual_call_info,
1245 CHECK_(methodHandle()));
1246 } else {
1247 // static call
1248 CompiledStaticCall::compute_entry(callee_method, static_call_info);
1249 }
1250
1251 // grab lock, check for deoptimization and potentially patch caller
1252 {
1253 MutexLocker ml_patch(CompiledIC_lock);
1254
1255 // Now that we are ready to patch if the Method* was redefined then
1256 // don't update call site and let the caller retry.
1257
1258 if (!callee_method->is_old()) {
1259 #ifdef ASSERT
1260 // We must not try to patch to jump to an already unloaded method.
1261 if (dest_entry_point != 0) {
1262 assert(CodeCache::find_blob(dest_entry_point) != NULL,
1263 "should not unload nmethod while locked");
1264 }
1265 #endif
1266 if (is_virtual) {
1267 nmethod* nm = callee_nm;
1268 if (nm == NULL) CodeCache::find_blob(caller_frame.pc());
1269 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1270 if (inline_cache->is_clean()) {
1271 inline_cache->set_to_monomorphic(virtual_call_info);
1272 }
1273 } else {
1274 CompiledStaticCall* ssc = compiledStaticCall_before(caller_frame.pc());
1275 if (ssc->is_clean()) ssc->set(static_call_info);
1276 }
1277 }
1278
1279 } // unlock CompiledIC_lock
1280
1281 return callee_method;
1282 }
1283
1284
1285 // Inline caches exist only in compiled code
1286 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread))
1287 #ifdef ASSERT
1288 RegisterMap reg_map(thread, false);
1289 frame stub_frame = thread->last_frame();
1290 assert(stub_frame.is_runtime_frame(), "sanity check");
1291 frame caller_frame = stub_frame.sender(®_map);
1292 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame");
1293 #endif /* ASSERT */
1294
1295 methodHandle callee_method;
1296 JRT_BLOCK
1297 callee_method = SharedRuntime::handle_ic_miss_helper(thread, CHECK_NULL);
1298 // Return Method* through TLS
1299 thread->set_vm_result_2(callee_method());
1300 JRT_BLOCK_END
1301 // return compiled code entry point after potential safepoints
1302 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1303 return callee_method->verified_code_entry();
1304 JRT_END
1305
1306
1307 // Handle call site that has been made non-entrant
1308 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread))
1309 // 6243940 We might end up in here if the callee is deoptimized
1310 // as we race to call it. We don't want to take a safepoint if
1311 // the caller was interpreted because the caller frame will look
1312 // interpreted to the stack walkers and arguments are now
1313 // "compiled" so it is much better to make this transition
1314 // invisible to the stack walking code. The i2c path will
1315 // place the callee method in the callee_target. It is stashed
1316 // there because if we try and find the callee by normal means a
1317 // safepoint is possible and have trouble gc'ing the compiled args.
1318 RegisterMap reg_map(thread, false);
1319 frame stub_frame = thread->last_frame();
1320 assert(stub_frame.is_runtime_frame(), "sanity check");
1321 frame caller_frame = stub_frame.sender(®_map);
1322
1323 if (caller_frame.is_interpreted_frame() ||
1324 caller_frame.is_entry_frame()) {
1325 Method* callee = thread->callee_target();
1326 guarantee(callee != NULL && callee->is_method(), "bad handshake");
1327 thread->set_vm_result_2(callee);
1328 thread->set_callee_target(NULL);
1329 return callee->get_c2i_entry();
1330 }
1331
1332 // Must be compiled to compiled path which is safe to stackwalk
1333 methodHandle callee_method;
1334 JRT_BLOCK
1335 // Force resolving of caller (if we called from compiled frame)
1336 callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_NULL);
1337 thread->set_vm_result_2(callee_method());
1338 JRT_BLOCK_END
1339 // return compiled code entry point after potential safepoints
1340 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1341 return callee_method->verified_code_entry();
1342 JRT_END
1343
1344
1345 // resolve a static call and patch code
1346 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread ))
1347 methodHandle callee_method;
1348 JRT_BLOCK
1349 callee_method = SharedRuntime::resolve_helper(thread, false, false, CHECK_NULL);
1350 thread->set_vm_result_2(callee_method());
1351 JRT_BLOCK_END
1352 // return compiled code entry point after potential safepoints
1353 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1354 return callee_method->verified_code_entry();
1355 JRT_END
1356
1357
1358 // resolve virtual call and update inline cache to monomorphic
1359 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread ))
1360 methodHandle callee_method;
1361 JRT_BLOCK
1362 callee_method = SharedRuntime::resolve_helper(thread, true, false, CHECK_NULL);
1363 thread->set_vm_result_2(callee_method());
1364 JRT_BLOCK_END
1365 // return compiled code entry point after potential safepoints
1366 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1367 return callee_method->verified_code_entry();
1368 JRT_END
1369
1370
1371 // Resolve a virtual call that can be statically bound (e.g., always
1372 // monomorphic, so it has no inline cache). Patch code to resolved target.
1373 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread))
1374 methodHandle callee_method;
1375 JRT_BLOCK
1376 callee_method = SharedRuntime::resolve_helper(thread, true, true, CHECK_NULL);
1377 thread->set_vm_result_2(callee_method());
1378 JRT_BLOCK_END
1379 // return compiled code entry point after potential safepoints
1380 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1381 return callee_method->verified_code_entry();
1382 JRT_END
1383
1384
1385
1386
1387
1388 methodHandle SharedRuntime::handle_ic_miss_helper(JavaThread *thread, TRAPS) {
1389 ResourceMark rm(thread);
1390 CallInfo call_info;
1391 Bytecodes::Code bc;
1392
1393 // receiver is NULL for static calls. An exception is thrown for NULL
1394 // receivers for non-static calls
1395 Handle receiver = find_callee_info(thread, bc, call_info,
1396 CHECK_(methodHandle()));
1397 // Compiler1 can produce virtual call sites that can actually be statically bound
1398 // If we fell thru to below we would think that the site was going megamorphic
1399 // when in fact the site can never miss. Worse because we'd think it was megamorphic
1400 // we'd try and do a vtable dispatch however methods that can be statically bound
1401 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a
1402 // reresolution of the call site (as if we did a handle_wrong_method and not an
1403 // plain ic_miss) and the site will be converted to an optimized virtual call site
1404 // never to miss again. I don't believe C2 will produce code like this but if it
1405 // did this would still be the correct thing to do for it too, hence no ifdef.
1406 //
1407 if (call_info.resolved_method()->can_be_statically_bound()) {
1408 methodHandle callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_(methodHandle()));
1409 if (TraceCallFixup) {
1410 RegisterMap reg_map(thread, false);
1411 frame caller_frame = thread->last_frame().sender(®_map);
1412 ResourceMark rm(thread);
1413 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc));
1414 callee_method->print_short_name(tty);
1415 tty->print_cr(" from pc: " INTPTR_FORMAT, caller_frame.pc());
1416 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1417 }
1418 return callee_method;
1419 }
1420
1421 methodHandle callee_method = call_info.selected_method();
1422
1423 bool should_be_mono = false;
1424
1425 #ifndef PRODUCT
1426 Atomic::inc(&_ic_miss_ctr);
1427
1428 // Statistics & Tracing
1429 if (TraceCallFixup) {
1430 ResourceMark rm(thread);
1431 tty->print("IC miss (%s) call to", Bytecodes::name(bc));
1432 callee_method->print_short_name(tty);
1433 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1434 }
1435
1436 if (ICMissHistogram) {
1437 MutexLocker m(VMStatistic_lock);
1438 RegisterMap reg_map(thread, false);
1439 frame f = thread->last_frame().real_sender(®_map);// skip runtime stub
1440 // produce statistics under the lock
1441 trace_ic_miss(f.pc());
1442 }
1443 #endif
1444
1445 // install an event collector so that when a vtable stub is created the
1446 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1447 // event can't be posted when the stub is created as locks are held
1448 // - instead the event will be deferred until the event collector goes
1449 // out of scope.
1450 JvmtiDynamicCodeEventCollector event_collector;
1451
1452 // Update inline cache to megamorphic. Skip update if caller has been
1453 // made non-entrant or we are called from interpreted.
1454 { MutexLocker ml_patch (CompiledIC_lock);
1455 RegisterMap reg_map(thread, false);
1456 frame caller_frame = thread->last_frame().sender(®_map);
1457 CodeBlob* cb = caller_frame.cb();
1458 if (cb->is_nmethod() && ((nmethod*)cb)->is_in_use()) {
1459 // Not a non-entrant nmethod, so find inline_cache
1460 CompiledIC* inline_cache = CompiledIC_before(((nmethod*)cb), caller_frame.pc());
1461 bool should_be_mono = false;
1462 if (inline_cache->is_optimized()) {
1463 if (TraceCallFixup) {
1464 ResourceMark rm(thread);
1465 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc));
1466 callee_method->print_short_name(tty);
1467 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1468 }
1469 should_be_mono = true;
1470 } else if (inline_cache->is_icholder_call()) {
1471 CompiledICHolder* ic_oop = inline_cache->cached_icholder();
1472 if ( ic_oop != NULL) {
1473
1474 if (receiver()->klass() == ic_oop->holder_klass()) {
1475 // This isn't a real miss. We must have seen that compiled code
1476 // is now available and we want the call site converted to a
1477 // monomorphic compiled call site.
1478 // We can't assert for callee_method->code() != NULL because it
1479 // could have been deoptimized in the meantime
1480 if (TraceCallFixup) {
1481 ResourceMark rm(thread);
1482 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc));
1483 callee_method->print_short_name(tty);
1484 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1485 }
1486 should_be_mono = true;
1487 }
1488 }
1489 }
1490
1491 if (should_be_mono) {
1492
1493 // We have a path that was monomorphic but was going interpreted
1494 // and now we have (or had) a compiled entry. We correct the IC
1495 // by using a new icBuffer.
1496 CompiledICInfo info;
1497 KlassHandle receiver_klass(THREAD, receiver()->klass());
1498 inline_cache->compute_monomorphic_entry(callee_method,
1499 receiver_klass,
1500 inline_cache->is_optimized(),
1501 false,
1502 info, CHECK_(methodHandle()));
1503 inline_cache->set_to_monomorphic(info);
1504 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) {
1505 // Change to megamorphic
1506 inline_cache->set_to_megamorphic(&call_info, bc, CHECK_(methodHandle()));
1507 } else {
1508 // Either clean or megamorphic
1509 }
1510 }
1511 } // Release CompiledIC_lock
1512
1513 return callee_method;
1514 }
1515
1516 //
1517 // Resets a call-site in compiled code so it will get resolved again.
1518 // This routines handles both virtual call sites, optimized virtual call
1519 // sites, and static call sites. Typically used to change a call sites
1520 // destination from compiled to interpreted.
1521 //
1522 methodHandle SharedRuntime::reresolve_call_site(JavaThread *thread, TRAPS) {
1523 ResourceMark rm(thread);
1524 RegisterMap reg_map(thread, false);
1525 frame stub_frame = thread->last_frame();
1526 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1527 frame caller = stub_frame.sender(®_map);
1528
1529 // Do nothing if the frame isn't a live compiled frame.
1530 // nmethod could be deoptimized by the time we get here
1531 // so no update to the caller is needed.
1532
1533 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) {
1534
1535 address pc = caller.pc();
1536
1537 // Default call_addr is the location of the "basic" call.
1538 // Determine the address of the call we a reresolving. With
1539 // Inline Caches we will always find a recognizable call.
1540 // With Inline Caches disabled we may or may not find a
1541 // recognizable call. We will always find a call for static
1542 // calls and for optimized virtual calls. For vanilla virtual
1543 // calls it depends on the state of the UseInlineCaches switch.
1544 //
1545 // With Inline Caches disabled we can get here for a virtual call
1546 // for two reasons:
1547 // 1 - calling an abstract method. The vtable for abstract methods
1548 // will run us thru handle_wrong_method and we will eventually
1549 // end up in the interpreter to throw the ame.
1550 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1551 // call and between the time we fetch the entry address and
1552 // we jump to it the target gets deoptimized. Similar to 1
1553 // we will wind up in the interprter (thru a c2i with c2).
1554 //
1555 address call_addr = NULL;
1556 {
1557 // Get call instruction under lock because another thread may be
1558 // busy patching it.
1559 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1560 // Location of call instruction
1561 if (NativeCall::is_call_before(pc)) {
1562 NativeCall *ncall = nativeCall_before(pc);
1563 call_addr = ncall->instruction_address();
1564 }
1565 }
1566
1567 // Check for static or virtual call
1568 bool is_static_call = false;
1569 nmethod* caller_nm = CodeCache::find_nmethod(pc);
1570 // Make sure nmethod doesn't get deoptimized and removed until
1571 // this is done with it.
1572 // CLEANUP - with lazy deopt shouldn't need this lock
1573 nmethodLocker nmlock(caller_nm);
1574
1575 if (call_addr != NULL) {
1576 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1577 int ret = iter.next(); // Get item
1578 if (ret) {
1579 assert(iter.addr() == call_addr, "must find call");
1580 if (iter.type() == relocInfo::static_call_type) {
1581 is_static_call = true;
1582 } else {
1583 assert(iter.type() == relocInfo::virtual_call_type ||
1584 iter.type() == relocInfo::opt_virtual_call_type
1585 , "unexpected relocInfo. type");
1586 }
1587 } else {
1588 assert(!UseInlineCaches, "relocation info. must exist for this address");
1589 }
1590
1591 // Cleaning the inline cache will force a new resolve. This is more robust
1592 // than directly setting it to the new destination, since resolving of calls
1593 // is always done through the same code path. (experience shows that it
1594 // leads to very hard to track down bugs, if an inline cache gets updated
1595 // to a wrong method). It should not be performance critical, since the
1596 // resolve is only done once.
1597
1598 MutexLocker ml(CompiledIC_lock);
1599 //
1600 // We do not patch the call site if the nmethod has been made non-entrant
1601 // as it is a waste of time
1602 //
1603 if (caller_nm->is_in_use()) {
1604 if (is_static_call) {
1605 CompiledStaticCall* ssc= compiledStaticCall_at(call_addr);
1606 ssc->set_to_clean();
1607 } else {
1608 // compiled, dispatched call (which used to call an interpreted method)
1609 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1610 inline_cache->set_to_clean();
1611 }
1612 }
1613 }
1614
1615 }
1616
1617 methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle()));
1618
1619
1620 #ifndef PRODUCT
1621 Atomic::inc(&_wrong_method_ctr);
1622
1623 if (TraceCallFixup) {
1624 ResourceMark rm(thread);
1625 tty->print("handle_wrong_method reresolving call to");
1626 callee_method->print_short_name(tty);
1627 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1628 }
1629 #endif
1630
1631 return callee_method;
1632 }
1633
1634 #ifdef ASSERT
1635 void SharedRuntime::check_member_name_argument_is_last_argument(methodHandle method,
1636 const BasicType* sig_bt,
1637 const VMRegPair* regs) {
1638 ResourceMark rm;
1639 const int total_args_passed = method->size_of_parameters();
1640 const VMRegPair* regs_with_member_name = regs;
1641 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1);
1642
1643 const int member_arg_pos = total_args_passed - 1;
1644 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob");
1645 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object");
1646
1647 const bool is_outgoing = method->is_method_handle_intrinsic();
1648 int comp_args_on_stack = java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1, is_outgoing);
1649
1650 for (int i = 0; i < member_arg_pos; i++) {
1651 VMReg a = regs_with_member_name[i].first();
1652 VMReg b = regs_without_member_name[i].first();
1653 assert(a->value() == b->value(), err_msg_res("register allocation mismatch: a=%d, b=%d", a->value(), b->value()));
1654 }
1655 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg");
1656 }
1657 #endif
1658
1659 // ---------------------------------------------------------------------------
1660 // We are calling the interpreter via a c2i. Normally this would mean that
1661 // we were called by a compiled method. However we could have lost a race
1662 // where we went int -> i2c -> c2i and so the caller could in fact be
1663 // interpreted. If the caller is compiled we attempt to patch the caller
1664 // so he no longer calls into the interpreter.
1665 IRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc))
1666 Method* moop(method);
1667
1668 address entry_point = moop->from_compiled_entry();
1669
1670 // It's possible that deoptimization can occur at a call site which hasn't
1671 // been resolved yet, in which case this function will be called from
1672 // an nmethod that has been patched for deopt and we can ignore the
1673 // request for a fixup.
1674 // Also it is possible that we lost a race in that from_compiled_entry
1675 // is now back to the i2c in that case we don't need to patch and if
1676 // we did we'd leap into space because the callsite needs to use
1677 // "to interpreter" stub in order to load up the Method*. Don't
1678 // ask me how I know this...
1679
1680 CodeBlob* cb = CodeCache::find_blob(caller_pc);
1681 if (!cb->is_nmethod() || entry_point == moop->get_c2i_entry()) {
1682 return;
1683 }
1684
1685 // The check above makes sure this is a nmethod.
1686 nmethod* nm = cb->as_nmethod_or_null();
1687 assert(nm, "must be");
1688
1689 // Get the return PC for the passed caller PC.
1690 address return_pc = caller_pc + frame::pc_return_offset;
1691
1692 // There is a benign race here. We could be attempting to patch to a compiled
1693 // entry point at the same time the callee is being deoptimized. If that is
1694 // the case then entry_point may in fact point to a c2i and we'd patch the
1695 // call site with the same old data. clear_code will set code() to NULL
1696 // at the end of it. If we happen to see that NULL then we can skip trying
1697 // to patch. If we hit the window where the callee has a c2i in the
1698 // from_compiled_entry and the NULL isn't present yet then we lose the race
1699 // and patch the code with the same old data. Asi es la vida.
1700
1701 if (moop->code() == NULL) return;
1702
1703 if (nm->is_in_use()) {
1704
1705 // Expect to find a native call there (unless it was no-inline cache vtable dispatch)
1706 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1707 if (NativeCall::is_call_before(return_pc)) {
1708 NativeCall *call = nativeCall_before(return_pc);
1709 //
1710 // bug 6281185. We might get here after resolving a call site to a vanilla
1711 // virtual call. Because the resolvee uses the verified entry it may then
1712 // see compiled code and attempt to patch the site by calling us. This would
1713 // then incorrectly convert the call site to optimized and its downhill from
1714 // there. If you're lucky you'll get the assert in the bugid, if not you've
1715 // just made a call site that could be megamorphic into a monomorphic site
1716 // for the rest of its life! Just another racing bug in the life of
1717 // fixup_callers_callsite ...
1718 //
1719 RelocIterator iter(nm, call->instruction_address(), call->next_instruction_address());
1720 iter.next();
1721 assert(iter.has_current(), "must have a reloc at java call site");
1722 relocInfo::relocType typ = iter.reloc()->type();
1723 if ( typ != relocInfo::static_call_type &&
1724 typ != relocInfo::opt_virtual_call_type &&
1725 typ != relocInfo::static_stub_type) {
1726 return;
1727 }
1728 address destination = call->destination();
1729 if (destination != entry_point) {
1730 CodeBlob* callee = CodeCache::find_blob(destination);
1731 // callee == cb seems weird. It means calling interpreter thru stub.
1732 if (callee == cb || callee->is_adapter_blob()) {
1733 // static call or optimized virtual
1734 if (TraceCallFixup) {
1735 tty->print("fixup callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);
1736 moop->print_short_name(tty);
1737 tty->print_cr(" to " INTPTR_FORMAT, entry_point);
1738 }
1739 call->set_destination_mt_safe(entry_point);
1740 } else {
1741 if (TraceCallFixup) {
1742 tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);
1743 moop->print_short_name(tty);
1744 tty->print_cr(" to " INTPTR_FORMAT, entry_point);
1745 }
1746 // assert is too strong could also be resolve destinations.
1747 // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be");
1748 }
1749 } else {
1750 if (TraceCallFixup) {
1751 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);
1752 moop->print_short_name(tty);
1753 tty->print_cr(" to " INTPTR_FORMAT, entry_point);
1754 }
1755 }
1756 }
1757 }
1758 IRT_END
1759
1760
1761 // same as JVM_Arraycopy, but called directly from compiled code
1762 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos,
1763 oopDesc* dest, jint dest_pos,
1764 jint length,
1765 JavaThread* thread)) {
1766 #ifndef PRODUCT
1767 _slow_array_copy_ctr++;
1768 #endif
1769 // Check if we have null pointers
1770 if (src == NULL || dest == NULL) {
1771 THROW(vmSymbols::java_lang_NullPointerException());
1772 }
1773 // Do the copy. The casts to arrayOop are necessary to the copy_array API,
1774 // even though the copy_array API also performs dynamic checks to ensure
1775 // that src and dest are truly arrays (and are conformable).
1776 // The copy_array mechanism is awkward and could be removed, but
1777 // the compilers don't call this function except as a last resort,
1778 // so it probably doesn't matter.
1779 src->klass()->copy_array((arrayOopDesc*)src, src_pos,
1780 (arrayOopDesc*)dest, dest_pos,
1781 length, thread);
1782 }
1783 JRT_END
1784
1785 char* SharedRuntime::generate_class_cast_message(
1786 JavaThread* thread, const char* objName) {
1787
1788 // Get target class name from the checkcast instruction
1789 vframeStream vfst(thread, true);
1790 assert(!vfst.at_end(), "Java frame must exist");
1791 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci()));
1792 Klass* targetKlass = vfst.method()->constants()->klass_at(
1793 cc.index(), thread);
1794 return generate_class_cast_message(objName, targetKlass->external_name());
1795 }
1796
1797 char* SharedRuntime::generate_class_cast_message(
1798 const char* objName, const char* targetKlassName, const char* desc) {
1799 size_t msglen = strlen(objName) + strlen(desc) + strlen(targetKlassName) + 1;
1800
1801 char* message = NEW_RESOURCE_ARRAY(char, msglen);
1802 if (NULL == message) {
1803 // Shouldn't happen, but don't cause even more problems if it does
1804 message = const_cast<char*>(objName);
1805 } else {
1806 jio_snprintf(message, msglen, "%s%s%s", objName, desc, targetKlassName);
1807 }
1808 return message;
1809 }
1810
1811 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
1812 (void) JavaThread::current()->reguard_stack();
1813 JRT_END
1814
1815
1816 // Handles the uncommon case in locking, i.e., contention or an inflated lock.
1817 #ifndef PRODUCT
1818 int SharedRuntime::_monitor_enter_ctr=0;
1819 #endif
1820 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread))
1821 oop obj(_obj);
1822 #ifndef PRODUCT
1823 _monitor_enter_ctr++; // monitor enter slow
1824 #endif
1825 if (PrintBiasedLockingStatistics) {
1826 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
1827 }
1828 Handle h_obj(THREAD, obj);
1829 if (UseBiasedLocking) {
1830 // Retry fast entry if bias is revoked to avoid unnecessary inflation
1831 ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK);
1832 } else {
1833 ObjectSynchronizer::slow_enter(h_obj, lock, CHECK);
1834 }
1835 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
1836 JRT_END
1837
1838 #ifndef PRODUCT
1839 int SharedRuntime::_monitor_exit_ctr=0;
1840 #endif
1841 // Handles the uncommon cases of monitor unlocking in compiled code
1842 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock))
1843 oop obj(_obj);
1844 #ifndef PRODUCT
1845 _monitor_exit_ctr++; // monitor exit slow
1846 #endif
1847 Thread* THREAD = JavaThread::current();
1848 // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore
1849 // testing was unable to ever fire the assert that guarded it so I have removed it.
1850 assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?");
1851 #undef MIGHT_HAVE_PENDING
1852 #ifdef MIGHT_HAVE_PENDING
1853 // Save and restore any pending_exception around the exception mark.
1854 // While the slow_exit must not throw an exception, we could come into
1855 // this routine with one set.
1856 oop pending_excep = NULL;
1857 const char* pending_file;
1858 int pending_line;
1859 if (HAS_PENDING_EXCEPTION) {
1860 pending_excep = PENDING_EXCEPTION;
1861 pending_file = THREAD->exception_file();
1862 pending_line = THREAD->exception_line();
1863 CLEAR_PENDING_EXCEPTION;
1864 }
1865 #endif /* MIGHT_HAVE_PENDING */
1866
1867 {
1868 // Exit must be non-blocking, and therefore no exceptions can be thrown.
1869 EXCEPTION_MARK;
1870 ObjectSynchronizer::slow_exit(obj, lock, THREAD);
1871 }
1872
1873 #ifdef MIGHT_HAVE_PENDING
1874 if (pending_excep != NULL) {
1875 THREAD->set_pending_exception(pending_excep, pending_file, pending_line);
1876 }
1877 #endif /* MIGHT_HAVE_PENDING */
1878 JRT_END
1879
1880 #ifndef PRODUCT
1881
1882 void SharedRuntime::print_statistics() {
1883 ttyLocker ttyl;
1884 if (xtty != NULL) xtty->head("statistics type='SharedRuntime'");
1885
1886 if (_monitor_enter_ctr ) tty->print_cr("%5d monitor enter slow", _monitor_enter_ctr);
1887 if (_monitor_exit_ctr ) tty->print_cr("%5d monitor exit slow", _monitor_exit_ctr);
1888 if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr);
1889
1890 SharedRuntime::print_ic_miss_histogram();
1891
1892 if (CountRemovableExceptions) {
1893 if (_nof_removable_exceptions > 0) {
1894 Unimplemented(); // this counter is not yet incremented
1895 tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions);
1896 }
1897 }
1898
1899 // Dump the JRT_ENTRY counters
1900 if( _new_instance_ctr ) tty->print_cr("%5d new instance requires GC", _new_instance_ctr);
1901 if( _new_array_ctr ) tty->print_cr("%5d new array requires GC", _new_array_ctr);
1902 if( _multi1_ctr ) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr);
1903 if( _multi2_ctr ) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr);
1904 if( _multi3_ctr ) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr);
1905 if( _multi4_ctr ) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr);
1906 if( _multi5_ctr ) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr);
1907
1908 tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr );
1909 tty->print_cr("%5d wrong method", _wrong_method_ctr );
1910 tty->print_cr("%5d unresolved static call site", _resolve_static_ctr );
1911 tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr );
1912 tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr );
1913
1914 if( _mon_enter_stub_ctr ) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr );
1915 if( _mon_exit_stub_ctr ) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr );
1916 if( _mon_enter_ctr ) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr );
1917 if( _mon_exit_ctr ) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr );
1918 if( _partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr );
1919 if( _jbyte_array_copy_ctr ) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr );
1920 if( _jshort_array_copy_ctr ) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr );
1921 if( _jint_array_copy_ctr ) tty->print_cr("%5d int array copies", _jint_array_copy_ctr );
1922 if( _jlong_array_copy_ctr ) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr );
1923 if( _oop_array_copy_ctr ) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr );
1924 if( _checkcast_array_copy_ctr ) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr );
1925 if( _unsafe_array_copy_ctr ) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr );
1926 if( _generic_array_copy_ctr ) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr );
1927 if( _slow_array_copy_ctr ) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr );
1928 if( _find_handler_ctr ) tty->print_cr("%5d find exception handler", _find_handler_ctr );
1929 if( _rethrow_ctr ) tty->print_cr("%5d rethrow handler", _rethrow_ctr );
1930
1931 AdapterHandlerLibrary::print_statistics();
1932
1933 if (xtty != NULL) xtty->tail("statistics");
1934 }
1935
1936 inline double percent(int x, int y) {
1937 return 100.0 * x / MAX2(y, 1);
1938 }
1939
1940 class MethodArityHistogram {
1941 public:
1942 enum { MAX_ARITY = 256 };
1943 private:
1944 static int _arity_histogram[MAX_ARITY]; // histogram of #args
1945 static int _size_histogram[MAX_ARITY]; // histogram of arg size in words
1946 static int _max_arity; // max. arity seen
1947 static int _max_size; // max. arg size seen
1948
1949 static void add_method_to_histogram(nmethod* nm) {
1950 Method* m = nm->method();
1951 ArgumentCount args(m->signature());
1952 int arity = args.size() + (m->is_static() ? 0 : 1);
1953 int argsize = m->size_of_parameters();
1954 arity = MIN2(arity, MAX_ARITY-1);
1955 argsize = MIN2(argsize, MAX_ARITY-1);
1956 int count = nm->method()->compiled_invocation_count();
1957 _arity_histogram[arity] += count;
1958 _size_histogram[argsize] += count;
1959 _max_arity = MAX2(_max_arity, arity);
1960 _max_size = MAX2(_max_size, argsize);
1961 }
1962
1963 void print_histogram_helper(int n, int* histo, const char* name) {
1964 const int N = MIN2(5, n);
1965 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
1966 double sum = 0;
1967 double weighted_sum = 0;
1968 int i;
1969 for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; }
1970 double rest = sum;
1971 double percent = sum / 100;
1972 for (i = 0; i <= N; i++) {
1973 rest -= histo[i];
1974 tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent);
1975 }
1976 tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent);
1977 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n);
1978 }
1979
1980 void print_histogram() {
1981 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
1982 print_histogram_helper(_max_arity, _arity_histogram, "arity");
1983 tty->print_cr("\nSame for parameter size (in words):");
1984 print_histogram_helper(_max_size, _size_histogram, "size");
1985 tty->cr();
1986 }
1987
1988 public:
1989 MethodArityHistogram() {
1990 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1991 _max_arity = _max_size = 0;
1992 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram [i] = 0;
1993 CodeCache::nmethods_do(add_method_to_histogram);
1994 print_histogram();
1995 }
1996 };
1997
1998 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY];
1999 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY];
2000 int MethodArityHistogram::_max_arity;
2001 int MethodArityHistogram::_max_size;
2002
2003 void SharedRuntime::print_call_statistics(int comp_total) {
2004 tty->print_cr("Calls from compiled code:");
2005 int total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls;
2006 int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls;
2007 int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls;
2008 tty->print_cr("\t%9d (%4.1f%%) total non-inlined ", total, percent(total, total));
2009 tty->print_cr("\t%9d (%4.1f%%) virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total));
2010 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls));
2011 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls));
2012 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_c, percent(mono_c, _nof_normal_calls));
2013 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls));
2014 tty->print_cr("\t%9d (%4.1f%%) interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total));
2015 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls));
2016 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls));
2017 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_i, percent(mono_i, _nof_interface_calls));
2018 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls));
2019 tty->print_cr("\t%9d (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total));
2020 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls));
2021 tty->cr();
2022 tty->print_cr("Note 1: counter updates are not MT-safe.");
2023 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
2024 tty->print_cr(" %% in nested categories are relative to their category");
2025 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
2026 tty->cr();
2027
2028 MethodArityHistogram h;
2029 }
2030 #endif
2031
2032
2033 // A simple wrapper class around the calling convention information
2034 // that allows sharing of adapters for the same calling convention.
2035 class AdapterFingerPrint : public CHeapObj<mtCode> {
2036 private:
2037 enum {
2038 _basic_type_bits = 4,
2039 _basic_type_mask = right_n_bits(_basic_type_bits),
2040 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2041 _compact_int_count = 3
2042 };
2043 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2044 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2045
2046 union {
2047 int _compact[_compact_int_count];
2048 int* _fingerprint;
2049 } _value;
2050 int _length; // A negative length indicates the fingerprint is in the compact form,
2051 // Otherwise _value._fingerprint is the array.
2052
2053 // Remap BasicTypes that are handled equivalently by the adapters.
2054 // These are correct for the current system but someday it might be
2055 // necessary to make this mapping platform dependent.
2056 static int adapter_encoding(BasicType in) {
2057 switch(in) {
2058 case T_BOOLEAN:
2059 case T_BYTE:
2060 case T_SHORT:
2061 case T_CHAR:
2062 // There are all promoted to T_INT in the calling convention
2063 return T_INT;
2064
2065 case T_OBJECT:
2066 case T_ARRAY:
2067 // In other words, we assume that any register good enough for
2068 // an int or long is good enough for a managed pointer.
2069 #ifdef _LP64
2070 return T_LONG;
2071 #else
2072 return T_INT;
2073 #endif
2074
2075 case T_INT:
2076 case T_LONG:
2077 case T_FLOAT:
2078 case T_DOUBLE:
2079 case T_VOID:
2080 return in;
2081
2082 default:
2083 ShouldNotReachHere();
2084 return T_CONFLICT;
2085 }
2086 }
2087
2088 public:
2089 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) {
2090 // The fingerprint is based on the BasicType signature encoded
2091 // into an array of ints with eight entries per int.
2092 int* ptr;
2093 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int;
2094 if (len <= _compact_int_count) {
2095 assert(_compact_int_count == 3, "else change next line");
2096 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0;
2097 // Storing the signature encoded as signed chars hits about 98%
2098 // of the time.
2099 _length = -len;
2100 ptr = _value._compact;
2101 } else {
2102 _length = len;
2103 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode);
2104 ptr = _value._fingerprint;
2105 }
2106
2107 // Now pack the BasicTypes with 8 per int
2108 int sig_index = 0;
2109 for (int index = 0; index < len; index++) {
2110 int value = 0;
2111 for (int byte = 0; byte < _basic_types_per_int; byte++) {
2112 int bt = ((sig_index < total_args_passed)
2113 ? adapter_encoding(sig_bt[sig_index++])
2114 : 0);
2115 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits");
2116 value = (value << _basic_type_bits) | bt;
2117 }
2118 ptr[index] = value;
2119 }
2120 }
2121
2122 ~AdapterFingerPrint() {
2123 if (_length > 0) {
2124 FREE_C_HEAP_ARRAY(int, _value._fingerprint, mtCode);
2125 }
2126 }
2127
2128 int value(int index) {
2129 if (_length < 0) {
2130 return _value._compact[index];
2131 }
2132 return _value._fingerprint[index];
2133 }
2134 int length() {
2135 if (_length < 0) return -_length;
2136 return _length;
2137 }
2138
2139 bool is_compact() {
2140 return _length <= 0;
2141 }
2142
2143 unsigned int compute_hash() {
2144 int hash = 0;
2145 for (int i = 0; i < length(); i++) {
2146 int v = value(i);
2147 hash = (hash << 8) ^ v ^ (hash >> 5);
2148 }
2149 return (unsigned int)hash;
2150 }
2151
2152 const char* as_string() {
2153 stringStream st;
2154 st.print("0x");
2155 for (int i = 0; i < length(); i++) {
2156 st.print("%08x", value(i));
2157 }
2158 return st.as_string();
2159 }
2160
2161 bool equals(AdapterFingerPrint* other) {
2162 if (other->_length != _length) {
2163 return false;
2164 }
2165 if (_length < 0) {
2166 assert(_compact_int_count == 3, "else change next line");
2167 return _value._compact[0] == other->_value._compact[0] &&
2168 _value._compact[1] == other->_value._compact[1] &&
2169 _value._compact[2] == other->_value._compact[2];
2170 } else {
2171 for (int i = 0; i < _length; i++) {
2172 if (_value._fingerprint[i] != other->_value._fingerprint[i]) {
2173 return false;
2174 }
2175 }
2176 }
2177 return true;
2178 }
2179 };
2180
2181
2182 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
2183 class AdapterHandlerTable : public BasicHashtable<mtCode> {
2184 friend class AdapterHandlerTableIterator;
2185
2186 private:
2187
2188 #ifndef PRODUCT
2189 static int _lookups; // number of calls to lookup
2190 static int _buckets; // number of buckets checked
2191 static int _equals; // number of buckets checked with matching hash
2192 static int _hits; // number of successful lookups
2193 static int _compact; // number of equals calls with compact signature
2194 #endif
2195
2196 AdapterHandlerEntry* bucket(int i) {
2197 return (AdapterHandlerEntry*)BasicHashtable<mtCode>::bucket(i);
2198 }
2199
2200 public:
2201 AdapterHandlerTable()
2202 : BasicHashtable<mtCode>(293, sizeof(AdapterHandlerEntry)) { }
2203
2204 // Create a new entry suitable for insertion in the table
2205 AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
2206 AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable<mtCode>::new_entry(fingerprint->compute_hash());
2207 entry->init(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
2208 return entry;
2209 }
2210
2211 // Insert an entry into the table
2212 void add(AdapterHandlerEntry* entry) {
2213 int index = hash_to_index(entry->hash());
2214 add_entry(index, entry);
2215 }
2216
2217 void free_entry(AdapterHandlerEntry* entry) {
2218 entry->deallocate();
2219 BasicHashtable<mtCode>::free_entry(entry);
2220 }
2221
2222 // Find a entry with the same fingerprint if it exists
2223 AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) {
2224 NOT_PRODUCT(_lookups++);
2225 AdapterFingerPrint fp(total_args_passed, sig_bt);
2226 unsigned int hash = fp.compute_hash();
2227 int index = hash_to_index(hash);
2228 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2229 NOT_PRODUCT(_buckets++);
2230 if (e->hash() == hash) {
2231 NOT_PRODUCT(_equals++);
2232 if (fp.equals(e->fingerprint())) {
2233 #ifndef PRODUCT
2234 if (fp.is_compact()) _compact++;
2235 _hits++;
2236 #endif
2237 return e;
2238 }
2239 }
2240 }
2241 return NULL;
2242 }
2243
2244 #ifndef PRODUCT
2245 void print_statistics() {
2246 ResourceMark rm;
2247 int longest = 0;
2248 int empty = 0;
2249 int total = 0;
2250 int nonempty = 0;
2251 for (int index = 0; index < table_size(); index++) {
2252 int count = 0;
2253 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2254 count++;
2255 }
2256 if (count != 0) nonempty++;
2257 if (count == 0) empty++;
2258 if (count > longest) longest = count;
2259 total += count;
2260 }
2261 tty->print_cr("AdapterHandlerTable: empty %d longest %d total %d average %f",
2262 empty, longest, total, total / (double)nonempty);
2263 tty->print_cr("AdapterHandlerTable: lookups %d buckets %d equals %d hits %d compact %d",
2264 _lookups, _buckets, _equals, _hits, _compact);
2265 }
2266 #endif
2267 };
2268
2269
2270 #ifndef PRODUCT
2271
2272 int AdapterHandlerTable::_lookups;
2273 int AdapterHandlerTable::_buckets;
2274 int AdapterHandlerTable::_equals;
2275 int AdapterHandlerTable::_hits;
2276 int AdapterHandlerTable::_compact;
2277
2278 #endif
2279
2280 class AdapterHandlerTableIterator : public StackObj {
2281 private:
2282 AdapterHandlerTable* _table;
2283 int _index;
2284 AdapterHandlerEntry* _current;
2285
2286 void scan() {
2287 while (_index < _table->table_size()) {
2288 AdapterHandlerEntry* a = _table->bucket(_index);
2289 _index++;
2290 if (a != NULL) {
2291 _current = a;
2292 return;
2293 }
2294 }
2295 }
2296
2297 public:
2298 AdapterHandlerTableIterator(AdapterHandlerTable* table): _table(table), _index(0), _current(NULL) {
2299 scan();
2300 }
2301 bool has_next() {
2302 return _current != NULL;
2303 }
2304 AdapterHandlerEntry* next() {
2305 if (_current != NULL) {
2306 AdapterHandlerEntry* result = _current;
2307 _current = _current->next();
2308 if (_current == NULL) scan();
2309 return result;
2310 } else {
2311 return NULL;
2312 }
2313 }
2314 };
2315
2316
2317 // ---------------------------------------------------------------------------
2318 // Implementation of AdapterHandlerLibrary
2319 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL;
2320 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL;
2321 const int AdapterHandlerLibrary_size = 16*K;
2322 BufferBlob* AdapterHandlerLibrary::_buffer = NULL;
2323
2324 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2325 // Should be called only when AdapterHandlerLibrary_lock is active.
2326 if (_buffer == NULL) // Initialize lazily
2327 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2328 return _buffer;
2329 }
2330
2331 void AdapterHandlerLibrary::initialize() {
2332 if (_adapters != NULL) return;
2333 _adapters = new AdapterHandlerTable();
2334
2335 // Create a special handler for abstract methods. Abstract methods
2336 // are never compiled so an i2c entry is somewhat meaningless, but
2337 // fill it in with something appropriate just in case. Pass handle
2338 // wrong method for the c2i transitions.
2339 address wrong_method = SharedRuntime::get_handle_wrong_method_stub();
2340 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL),
2341 StubRoutines::throw_AbstractMethodError_entry(),
2342 wrong_method, wrong_method);
2343 }
2344
2345 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint,
2346 address i2c_entry,
2347 address c2i_entry,
2348 address c2i_unverified_entry) {
2349 return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
2350 }
2351
2352 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(methodHandle method) {
2353 // Use customized signature handler. Need to lock around updates to
2354 // the AdapterHandlerTable (it is not safe for concurrent readers
2355 // and a single writer: this could be fixed if it becomes a
2356 // problem).
2357
2358 // Get the address of the ic_miss handlers before we grab the
2359 // AdapterHandlerLibrary_lock. This fixes bug 6236259 which
2360 // was caused by the initialization of the stubs happening
2361 // while we held the lock and then notifying jvmti while
2362 // holding it. This just forces the initialization to be a little
2363 // earlier.
2364 address ic_miss = SharedRuntime::get_ic_miss_stub();
2365 assert(ic_miss != NULL, "must have handler");
2366
2367 ResourceMark rm;
2368
2369 NOT_PRODUCT(int insts_size);
2370 AdapterBlob* B = NULL;
2371 AdapterHandlerEntry* entry = NULL;
2372 AdapterFingerPrint* fingerprint = NULL;
2373 {
2374 MutexLocker mu(AdapterHandlerLibrary_lock);
2375 // make sure data structure is initialized
2376 initialize();
2377
2378 if (method->is_abstract()) {
2379 return _abstract_method_handler;
2380 }
2381
2382 // Fill in the signature array, for the calling-convention call.
2383 int total_args_passed = method->size_of_parameters(); // All args on stack
2384
2385 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2386 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2387 int i = 0;
2388 if (!method->is_static()) // Pass in receiver first
2389 sig_bt[i++] = T_OBJECT;
2390 for (SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) {
2391 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2392 if (ss.type() == T_LONG || ss.type() == T_DOUBLE)
2393 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2394 }
2395 assert(i == total_args_passed, "");
2396
2397 // Lookup method signature's fingerprint
2398 entry = _adapters->lookup(total_args_passed, sig_bt);
2399
2400 #ifdef ASSERT
2401 AdapterHandlerEntry* shared_entry = NULL;
2402 if (VerifyAdapterSharing && entry != NULL) {
2403 shared_entry = entry;
2404 entry = NULL;
2405 }
2406 #endif
2407
2408 if (entry != NULL) {
2409 return entry;
2410 }
2411
2412 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
2413 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false);
2414
2415 // Make a C heap allocated version of the fingerprint to store in the adapter
2416 fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt);
2417
2418 // Create I2C & C2I handlers
2419
2420 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2421 if (buf != NULL) {
2422 CodeBuffer buffer(buf);
2423 short buffer_locs[20];
2424 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
2425 sizeof(buffer_locs)/sizeof(relocInfo));
2426 MacroAssembler _masm(&buffer);
2427
2428 entry = SharedRuntime::generate_i2c2i_adapters(&_masm,
2429 total_args_passed,
2430 comp_args_on_stack,
2431 sig_bt,
2432 regs,
2433 fingerprint);
2434
2435 #ifdef ASSERT
2436 if (VerifyAdapterSharing) {
2437 if (shared_entry != NULL) {
2438 assert(shared_entry->compare_code(buf->code_begin(), buffer.insts_size(), total_args_passed, sig_bt),
2439 "code must match");
2440 // Release the one just created and return the original
2441 _adapters->free_entry(entry);
2442 return shared_entry;
2443 } else {
2444 entry->save_code(buf->code_begin(), buffer.insts_size(), total_args_passed, sig_bt);
2445 }
2446 }
2447 #endif
2448
2449 B = AdapterBlob::create(&buffer);
2450 NOT_PRODUCT(insts_size = buffer.insts_size());
2451 }
2452 if (B == NULL) {
2453 // CodeCache is full, disable compilation
2454 // Ought to log this but compile log is only per compile thread
2455 // and we're some non descript Java thread.
2456 MutexUnlocker mu(AdapterHandlerLibrary_lock);
2457 CompileBroker::handle_full_code_cache();
2458 return NULL; // Out of CodeCache space
2459 }
2460 entry->relocate(B->content_begin());
2461 #ifndef PRODUCT
2462 // debugging suppport
2463 if (PrintAdapterHandlers || PrintStubCode) {
2464 ttyLocker ttyl;
2465 entry->print_adapter_on(tty);
2466 tty->print_cr("i2c argument handler #%d for: %s %s (%d bytes generated)",
2467 _adapters->number_of_entries(), (method->is_static() ? "static" : "receiver"),
2468 method->signature()->as_C_string(), insts_size);
2469 tty->print_cr("c2i argument handler starts at %p",entry->get_c2i_entry());
2470 if (Verbose || PrintStubCode) {
2471 address first_pc = entry->base_address();
2472 if (first_pc != NULL) {
2473 Disassembler::decode(first_pc, first_pc + insts_size);
2474 tty->cr();
2475 }
2476 }
2477 }
2478 #endif
2479
2480 _adapters->add(entry);
2481 }
2482 // Outside of the lock
2483 if (B != NULL) {
2484 char blob_id[256];
2485 jio_snprintf(blob_id,
2486 sizeof(blob_id),
2487 "%s(%s)@" PTR_FORMAT,
2488 B->name(),
2489 fingerprint->as_string(),
2490 B->content_begin());
2491 Forte::register_stub(blob_id, B->content_begin(), B->content_end());
2492
2493 if (JvmtiExport::should_post_dynamic_code_generated()) {
2494 JvmtiExport::post_dynamic_code_generated(blob_id, B->content_begin(), B->content_end());
2495 }
2496 }
2497 return entry;
2498 }
2499
2500 address AdapterHandlerEntry::base_address() {
2501 address base = _i2c_entry;
2502 if (base == NULL) base = _c2i_entry;
2503 assert(base <= _c2i_entry || _c2i_entry == NULL, "");
2504 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == NULL, "");
2505 return base;
2506 }
2507
2508 void AdapterHandlerEntry::relocate(address new_base) {
2509 address old_base = base_address();
2510 assert(old_base != NULL, "");
2511 ptrdiff_t delta = new_base - old_base;
2512 if (_i2c_entry != NULL)
2513 _i2c_entry += delta;
2514 if (_c2i_entry != NULL)
2515 _c2i_entry += delta;
2516 if (_c2i_unverified_entry != NULL)
2517 _c2i_unverified_entry += delta;
2518 assert(base_address() == new_base, "");
2519 }
2520
2521
2522 void AdapterHandlerEntry::deallocate() {
2523 delete _fingerprint;
2524 #ifdef ASSERT
2525 if (_saved_code) FREE_C_HEAP_ARRAY(unsigned char, _saved_code, mtCode);
2526 if (_saved_sig) FREE_C_HEAP_ARRAY(Basictype, _saved_sig, mtCode);
2527 #endif
2528 }
2529
2530
2531 #ifdef ASSERT
2532 // Capture the code before relocation so that it can be compared
2533 // against other versions. If the code is captured after relocation
2534 // then relative instructions won't be equivalent.
2535 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length, int total_args_passed, BasicType* sig_bt) {
2536 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
2537 _code_length = length;
2538 memcpy(_saved_code, buffer, length);
2539 _total_args_passed = total_args_passed;
2540 _saved_sig = NEW_C_HEAP_ARRAY(BasicType, _total_args_passed, mtCode);
2541 memcpy(_saved_sig, sig_bt, _total_args_passed * sizeof(BasicType));
2542 }
2543
2544
2545 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length, int total_args_passed, BasicType* sig_bt) {
2546 if (length != _code_length) {
2547 return false;
2548 }
2549 for (int i = 0; i < length; i++) {
2550 if (buffer[i] != _saved_code[i]) {
2551 return false;
2552 }
2553 }
2554 return true;
2555 }
2556 #endif
2557
2558
2559 // Create a native wrapper for this native method. The wrapper converts the
2560 // java compiled calling convention to the native convention, handlizes
2561 // arguments, and transitions to native. On return from the native we transition
2562 // back to java blocking if a safepoint is in progress.
2563 nmethod *AdapterHandlerLibrary::create_native_wrapper(methodHandle method, int compile_id) {
2564 ResourceMark rm;
2565 nmethod* nm = NULL;
2566
2567 assert(method->is_native(), "must be native");
2568 assert(method->is_method_handle_intrinsic() ||
2569 method->has_native_function(), "must have something valid to call!");
2570
2571 {
2572 // perform the work while holding the lock, but perform any printing outside the lock
2573 MutexLocker mu(AdapterHandlerLibrary_lock);
2574 // See if somebody beat us to it
2575 nm = method->code();
2576 if (nm) {
2577 return nm;
2578 }
2579
2580 ResourceMark rm;
2581
2582 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2583 if (buf != NULL) {
2584 CodeBuffer buffer(buf);
2585 double locs_buf[20];
2586 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2587 MacroAssembler _masm(&buffer);
2588
2589 // Fill in the signature array, for the calling-convention call.
2590 const int total_args_passed = method->size_of_parameters();
2591
2592 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2593 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2594 int i=0;
2595 if( !method->is_static() ) // Pass in receiver first
2596 sig_bt[i++] = T_OBJECT;
2597 SignatureStream ss(method->signature());
2598 for( ; !ss.at_return_type(); ss.next()) {
2599 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2600 if( ss.type() == T_LONG || ss.type() == T_DOUBLE )
2601 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2602 }
2603 assert(i == total_args_passed, "");
2604 BasicType ret_type = ss.type();
2605
2606 // Now get the compiled-Java layout as input (or output) arguments.
2607 // NOTE: Stubs for compiled entry points of method handle intrinsics
2608 // are just trampolines so the argument registers must be outgoing ones.
2609 const bool is_outgoing = method->is_method_handle_intrinsic();
2610 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, is_outgoing);
2611
2612 // Generate the compiled-to-native wrapper code
2613 nm = SharedRuntime::generate_native_wrapper(&_masm,
2614 method,
2615 compile_id,
2616 sig_bt,
2617 regs,
2618 ret_type);
2619 }
2620 }
2621
2622 // Must unlock before calling set_code
2623
2624 // Install the generated code.
2625 if (nm != NULL) {
2626 if (PrintCompilation) {
2627 ttyLocker ttyl;
2628 CompileTask::print_compilation(tty, nm, method->is_static() ? "(static)" : "");
2629 }
2630 method->set_code(method, nm);
2631 nm->post_compiled_method_load_event();
2632 } else {
2633 // CodeCache is full, disable compilation
2634 CompileBroker::handle_full_code_cache();
2635 }
2636 return nm;
2637 }
2638
2639 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::block_for_jni_critical(JavaThread* thread))
2640 assert(thread == JavaThread::current(), "must be");
2641 // The code is about to enter a JNI lazy critical native method and
2642 // _needs_gc is true, so if this thread is already in a critical
2643 // section then just return, otherwise this thread should block
2644 // until needs_gc has been cleared.
2645 if (thread->in_critical()) {
2646 return;
2647 }
2648 // Lock and unlock a critical section to give the system a chance to block
2649 GC_locker::lock_critical(thread);
2650 GC_locker::unlock_critical(thread);
2651 JRT_END
2652
2653 #ifdef HAVE_DTRACE_H
2654 // Create a dtrace nmethod for this method. The wrapper converts the
2655 // java compiled calling convention to the native convention, makes a dummy call
2656 // (actually nops for the size of the call instruction, which become a trap if
2657 // probe is enabled). The returns to the caller. Since this all looks like a
2658 // leaf no thread transition is needed.
2659
2660 nmethod *AdapterHandlerLibrary::create_dtrace_nmethod(methodHandle method) {
2661 ResourceMark rm;
2662 nmethod* nm = NULL;
2663
2664 if (PrintCompilation) {
2665 ttyLocker ttyl;
2666 tty->print("--- n%s ");
2667 method->print_short_name(tty);
2668 if (method->is_static()) {
2669 tty->print(" (static)");
2670 }
2671 tty->cr();
2672 }
2673
2674 {
2675 // perform the work while holding the lock, but perform any printing
2676 // outside the lock
2677 MutexLocker mu(AdapterHandlerLibrary_lock);
2678 // See if somebody beat us to it
2679 nm = method->code();
2680 if (nm) {
2681 return nm;
2682 }
2683
2684 ResourceMark rm;
2685
2686 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2687 if (buf != NULL) {
2688 CodeBuffer buffer(buf);
2689 // Need a few relocation entries
2690 double locs_buf[20];
2691 buffer.insts()->initialize_shared_locs(
2692 (relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2693 MacroAssembler _masm(&buffer);
2694
2695 // Generate the compiled-to-native wrapper code
2696 nm = SharedRuntime::generate_dtrace_nmethod(&_masm, method);
2697 }
2698 }
2699 return nm;
2700 }
2701
2702 // the dtrace method needs to convert java lang string to utf8 string.
2703 void SharedRuntime::get_utf(oopDesc* src, address dst) {
2704 typeArrayOop jlsValue = java_lang_String::value(src);
2705 int jlsOffset = java_lang_String::offset(src);
2706 int jlsLen = java_lang_String::length(src);
2707 jchar* jlsPos = (jlsLen == 0) ? NULL :
2708 jlsValue->char_at_addr(jlsOffset);
2709 assert(TypeArrayKlass::cast(jlsValue->klass())->element_type() == T_CHAR, "compressed string");
2710 (void) UNICODE::as_utf8(jlsPos, jlsLen, (char *)dst, max_dtrace_string_size);
2711 }
2712 #endif // ndef HAVE_DTRACE_H
2713
2714 // -------------------------------------------------------------------------
2715 // Java-Java calling convention
2716 // (what you use when Java calls Java)
2717
2718 //------------------------------name_for_receiver----------------------------------
2719 // For a given signature, return the VMReg for parameter 0.
2720 VMReg SharedRuntime::name_for_receiver() {
2721 VMRegPair regs;
2722 BasicType sig_bt = T_OBJECT;
2723 (void) java_calling_convention(&sig_bt, ®s, 1, true);
2724 // Return argument 0 register. In the LP64 build pointers
2725 // take 2 registers, but the VM wants only the 'main' name.
2726 return regs.first();
2727 }
2728
2729 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, int* arg_size) {
2730 // This method is returning a data structure allocating as a
2731 // ResourceObject, so do not put any ResourceMarks in here.
2732 char *s = sig->as_C_string();
2733 int len = (int)strlen(s);
2734 *s++; len--; // Skip opening paren
2735 char *t = s+len;
2736 while( *(--t) != ')' ) ; // Find close paren
2737
2738 BasicType *sig_bt = NEW_RESOURCE_ARRAY( BasicType, 256 );
2739 VMRegPair *regs = NEW_RESOURCE_ARRAY( VMRegPair, 256 );
2740 int cnt = 0;
2741 if (has_receiver) {
2742 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature
2743 }
2744
2745 while( s < t ) {
2746 switch( *s++ ) { // Switch on signature character
2747 case 'B': sig_bt[cnt++] = T_BYTE; break;
2748 case 'C': sig_bt[cnt++] = T_CHAR; break;
2749 case 'D': sig_bt[cnt++] = T_DOUBLE; sig_bt[cnt++] = T_VOID; break;
2750 case 'F': sig_bt[cnt++] = T_FLOAT; break;
2751 case 'I': sig_bt[cnt++] = T_INT; break;
2752 case 'J': sig_bt[cnt++] = T_LONG; sig_bt[cnt++] = T_VOID; break;
2753 case 'S': sig_bt[cnt++] = T_SHORT; break;
2754 case 'Z': sig_bt[cnt++] = T_BOOLEAN; break;
2755 case 'V': sig_bt[cnt++] = T_VOID; break;
2756 case 'L': // Oop
2757 while( *s++ != ';' ) ; // Skip signature
2758 sig_bt[cnt++] = T_OBJECT;
2759 break;
2760 case '[': { // Array
2761 do { // Skip optional size
2762 while( *s >= '0' && *s <= '9' ) s++;
2763 } while( *s++ == '[' ); // Nested arrays?
2764 // Skip element type
2765 if( s[-1] == 'L' )
2766 while( *s++ != ';' ) ; // Skip signature
2767 sig_bt[cnt++] = T_ARRAY;
2768 break;
2769 }
2770 default : ShouldNotReachHere();
2771 }
2772 }
2773 assert( cnt < 256, "grow table size" );
2774
2775 int comp_args_on_stack;
2776 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true);
2777
2778 // the calling convention doesn't count out_preserve_stack_slots so
2779 // we must add that in to get "true" stack offsets.
2780
2781 if (comp_args_on_stack) {
2782 for (int i = 0; i < cnt; i++) {
2783 VMReg reg1 = regs[i].first();
2784 if( reg1->is_stack()) {
2785 // Yuck
2786 reg1 = reg1->bias(out_preserve_stack_slots());
2787 }
2788 VMReg reg2 = regs[i].second();
2789 if( reg2->is_stack()) {
2790 // Yuck
2791 reg2 = reg2->bias(out_preserve_stack_slots());
2792 }
2793 regs[i].set_pair(reg2, reg1);
2794 }
2795 }
2796
2797 // results
2798 *arg_size = cnt;
2799 return regs;
2800 }
2801
2802 // OSR Migration Code
2803 //
2804 // This code is used convert interpreter frames into compiled frames. It is
2805 // called from very start of a compiled OSR nmethod. A temp array is
2806 // allocated to hold the interesting bits of the interpreter frame. All
2807 // active locks are inflated to allow them to move. The displaced headers and
2808 // active interpeter locals are copied into the temp buffer. Then we return
2809 // back to the compiled code. The compiled code then pops the current
2810 // interpreter frame off the stack and pushes a new compiled frame. Then it
2811 // copies the interpreter locals and displaced headers where it wants.
2812 // Finally it calls back to free the temp buffer.
2813 //
2814 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed.
2815
2816 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) )
2817
2818 //
2819 // This code is dependent on the memory layout of the interpreter local
2820 // array and the monitors. On all of our platforms the layout is identical
2821 // so this code is shared. If some platform lays the their arrays out
2822 // differently then this code could move to platform specific code or
2823 // the code here could be modified to copy items one at a time using
2824 // frame accessor methods and be platform independent.
2825
2826 frame fr = thread->last_frame();
2827 assert( fr.is_interpreted_frame(), "" );
2828 assert( fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks" );
2829
2830 // Figure out how many monitors are active.
2831 int active_monitor_count = 0;
2832 for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
2833 kptr < fr.interpreter_frame_monitor_begin();
2834 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
2835 if( kptr->obj() != NULL ) active_monitor_count++;
2836 }
2837
2838 // QQQ we could place number of active monitors in the array so that compiled code
2839 // could double check it.
2840
2841 Method* moop = fr.interpreter_frame_method();
2842 int max_locals = moop->max_locals();
2843 // Allocate temp buffer, 1 word per local & 2 per active monitor
2844 int buf_size_words = max_locals + active_monitor_count*2;
2845 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode);
2846
2847 // Copy the locals. Order is preserved so that loading of longs works.
2848 // Since there's no GC I can copy the oops blindly.
2849 assert( sizeof(HeapWord)==sizeof(intptr_t), "fix this code");
2850 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
2851 (HeapWord*)&buf[0],
2852 max_locals);
2853
2854 // Inflate locks. Copy the displaced headers. Be careful, there can be holes.
2855 int i = max_locals;
2856 for( BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();
2857 kptr2 < fr.interpreter_frame_monitor_begin();
2858 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {
2859 if( kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array
2860 BasicLock *lock = kptr2->lock();
2861 // Inflate so the displaced header becomes position-independent
2862 if (lock->displaced_header()->is_unlocked())
2863 ObjectSynchronizer::inflate_helper(kptr2->obj());
2864 // Now the displaced header is free to move
2865 buf[i++] = (intptr_t)lock->displaced_header();
2866 buf[i++] = (intptr_t)kptr2->obj();
2867 }
2868 }
2869 assert( i - max_locals == active_monitor_count*2, "found the expected number of monitors" );
2870
2871 return buf;
2872 JRT_END
2873
2874 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) )
2875 FREE_C_HEAP_ARRAY(intptr_t,buf, mtCode);
2876 JRT_END
2877
2878 bool AdapterHandlerLibrary::contains(CodeBlob* b) {
2879 AdapterHandlerTableIterator iter(_adapters);
2880 while (iter.has_next()) {
2881 AdapterHandlerEntry* a = iter.next();
2882 if ( b == CodeCache::find_blob(a->get_i2c_entry()) ) return true;
2883 }
2884 return false;
2885 }
2886
2887 void AdapterHandlerLibrary::print_handler_on(outputStream* st, CodeBlob* b) {
2888 AdapterHandlerTableIterator iter(_adapters);
2889 while (iter.has_next()) {
2890 AdapterHandlerEntry* a = iter.next();
2891 if (b == CodeCache::find_blob(a->get_i2c_entry())) {
2892 st->print("Adapter for signature: ");
2893 a->print_adapter_on(tty);
2894 return;
2895 }
2896 }
2897 assert(false, "Should have found handler");
2898 }
2899
2900 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
2901 st->print_cr("AHE@" INTPTR_FORMAT ": %s i2c: " INTPTR_FORMAT " c2i: " INTPTR_FORMAT " c2iUV: " INTPTR_FORMAT,
2902 (intptr_t) this, fingerprint()->as_string(),
2903 get_i2c_entry(), get_c2i_entry(), get_c2i_unverified_entry());
2904
2905 }
2906
2907 #ifndef PRODUCT
2908
2909 void AdapterHandlerLibrary::print_statistics() {
2910 _adapters->print_statistics();
2911 }
2912
2913 #endif /* PRODUCT */