1 /*
2 * Copyright (c) 1997, 2013, 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 = cast_to_oop(*caller.interpreter_frame_tos_at(args_size - 1));
581 assert(Universe::heap()->is_in(result) && result->is_oop(), "receiver must be an oop");
582 return result;
583 }
584
585
586 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception) {
587 if (JvmtiExport::can_post_on_exceptions()) {
588 vframeStream vfst(thread, true);
589 methodHandle method = methodHandle(thread, vfst.method());
590 address bcp = method()->bcp_from(vfst.bci());
591 JvmtiExport::post_exception_throw(thread, method(), bcp, h_exception());
592 }
593 Exceptions::_throw(thread, __FILE__, __LINE__, h_exception);
594 }
595
596 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message) {
597 Handle h_exception = Exceptions::new_exception(thread, name, message);
598 throw_and_post_jvmti_exception(thread, h_exception);
599 }
600
601 // The interpreter code to call this tracing function is only
602 // called/generated when TraceRedefineClasses has the right bits
603 // set. Since obsolete methods are never compiled, we don't have
604 // to modify the compilers to generate calls to this function.
605 //
606 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry(
607 JavaThread* thread, Method* method))
608 assert(RC_TRACE_IN_RANGE(0x00001000, 0x00002000), "wrong call");
609
610 if (method->is_obsolete()) {
611 // We are calling an obsolete method, but this is not necessarily
612 // an error. Our method could have been redefined just after we
613 // fetched the Method* from the constant pool.
614
615 // RC_TRACE macro has an embedded ResourceMark
616 RC_TRACE_WITH_THREAD(0x00001000, thread,
617 ("calling obsolete method '%s'",
618 method->name_and_sig_as_C_string()));
619 if (RC_TRACE_ENABLED(0x00002000)) {
620 // this option is provided to debug calls to obsolete methods
621 guarantee(false, "faulting at call to an obsolete method.");
622 }
623 }
624 return 0;
625 JRT_END
626
627 // ret_pc points into caller; we are returning caller's exception handler
628 // for given exception
629 address SharedRuntime::compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
630 bool force_unwind, bool top_frame_only) {
631 assert(nm != NULL, "must exist");
632 ResourceMark rm;
633
634 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 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob();
817 if (!is_in_blob) {
818 cb->print();
819 fatal(err_msg("exception happened outside interpreter, nmethods and vtable stubs at pc " INTPTR_FORMAT, pc));
820 }
821 Events::log_exception(thread, "NullPointerException in code blob at " INTPTR_FORMAT, pc);
822 // There is no handler here, so we will simply unwind.
823 return StubRoutines::throw_NullPointerException_at_call_entry();
824 }
825
826 // Otherwise, it's an nmethod. Consult its exception handlers.
827 nmethod* nm = (nmethod*)cb;
828 if (nm->inlinecache_check_contains(pc)) {
829 // exception happened inside inline-cache check code
830 // => the nmethod is not yet active (i.e., the frame
831 // is not set up yet) => use return address pushed by
832 // caller => don't push another return address
833 Events::log_exception(thread, "NullPointerException in IC check " INTPTR_FORMAT, pc);
834 return StubRoutines::throw_NullPointerException_at_call_entry();
835 }
836
837 if (nm->method()->is_method_handle_intrinsic()) {
838 // exception happened inside MH dispatch code, similar to a vtable stub
839 Events::log_exception(thread, "NullPointerException in MH adapter " INTPTR_FORMAT, pc);
840 return StubRoutines::throw_NullPointerException_at_call_entry();
841 }
842
843 #ifndef PRODUCT
844 _implicit_null_throws++;
845 #endif
846 target_pc = nm->continuation_for_implicit_exception(pc);
847 // If there's an unexpected fault, target_pc might be NULL,
848 // in which case we want to fall through into the normal
849 // error handling code.
850 }
851
852 break; // fall through
853 }
854
855
856 case IMPLICIT_DIVIDE_BY_ZERO: {
857 nmethod* nm = CodeCache::find_nmethod(pc);
858 guarantee(nm != NULL, "must have containing nmethod for implicit division-by-zero exceptions");
859 #ifndef PRODUCT
860 _implicit_div0_throws++;
861 #endif
862 target_pc = nm->continuation_for_implicit_exception(pc);
863 // If there's an unexpected fault, target_pc might be NULL,
864 // in which case we want to fall through into the normal
865 // error handling code.
866 break; // fall through
867 }
868
869 default: ShouldNotReachHere();
870 }
871
872 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind");
873
874 // for AbortVMOnException flag
875 NOT_PRODUCT(Exceptions::debug_check_abort("java.lang.NullPointerException"));
876 if (exception_kind == IMPLICIT_NULL) {
877 Events::log_exception(thread, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc);
878 } else {
879 Events::log_exception(thread, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc);
880 }
881 return target_pc;
882 }
883
884 ShouldNotReachHere();
885 return NULL;
886 }
887
888
889 /**
890 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is
891 * installed in the native function entry of all native Java methods before
892 * they get linked to their actual native methods.
893 *
894 * \note
895 * This method actually never gets called! The reason is because
896 * the interpreter's native entries call NativeLookup::lookup() which
897 * throws the exception when the lookup fails. The exception is then
898 * caught and forwarded on the return from NativeLookup::lookup() call
899 * before the call to the native function. This might change in the future.
900 */
901 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...))
902 {
903 // We return a bad value here to make sure that the exception is
904 // forwarded before we look at the return value.
905 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badJNIHandle);
906 }
907 JNI_END
908
909 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
910 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
911 }
912
913
914 #ifndef PRODUCT
915 JRT_ENTRY(intptr_t, SharedRuntime::trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
916 const frame f = thread->last_frame();
917 assert(f.is_interpreted_frame(), "must be an interpreted frame");
918 #ifndef PRODUCT
919 methodHandle mh(THREAD, f.interpreter_frame_method());
920 BytecodeTracer::trace(mh, f.interpreter_frame_bcp(), tos, tos2);
921 #endif // !PRODUCT
922 return preserve_this_value;
923 JRT_END
924 #endif // !PRODUCT
925
926
927 JRT_ENTRY(void, SharedRuntime::yield_all(JavaThread* thread, int attempts))
928 os::yield_all(attempts);
929 JRT_END
930
931
932 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
933 assert(obj->is_oop(), "must be a valid oop");
934 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
935 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
936 JRT_END
937
938
939 jlong SharedRuntime::get_java_tid(Thread* thread) {
940 if (thread != NULL) {
941 if (thread->is_Java_thread()) {
942 oop obj = ((JavaThread*)thread)->threadObj();
943 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj);
944 }
945 }
946 return 0;
947 }
948
949 /**
950 * This function ought to be a void function, but cannot be because
951 * it gets turned into a tail-call on sparc, which runs into dtrace bug
952 * 6254741. Once that is fixed we can remove the dummy return value.
953 */
954 int SharedRuntime::dtrace_object_alloc(oopDesc* o) {
955 return dtrace_object_alloc_base(Thread::current(), o);
956 }
957
958 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o) {
959 assert(DTraceAllocProbes, "wrong call");
960 Klass* klass = o->klass();
961 int size = o->size();
962 Symbol* name = klass->name();
963 #ifndef USDT2
964 HS_DTRACE_PROBE4(hotspot, object__alloc, get_java_tid(thread),
965 name->bytes(), name->utf8_length(), size * HeapWordSize);
966 #else /* USDT2 */
967 HOTSPOT_OBJECT_ALLOC(
968 get_java_tid(thread),
969 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize);
970 #endif /* USDT2 */
971 return 0;
972 }
973
974 JRT_LEAF(int, SharedRuntime::dtrace_method_entry(
975 JavaThread* thread, Method* method))
976 assert(DTraceMethodProbes, "wrong call");
977 Symbol* kname = method->klass_name();
978 Symbol* name = method->name();
979 Symbol* sig = method->signature();
980 #ifndef USDT2
981 HS_DTRACE_PROBE7(hotspot, method__entry, get_java_tid(thread),
982 kname->bytes(), kname->utf8_length(),
983 name->bytes(), name->utf8_length(),
984 sig->bytes(), sig->utf8_length());
985 #else /* USDT2 */
986 HOTSPOT_METHOD_ENTRY(
987 get_java_tid(thread),
988 (char *) kname->bytes(), kname->utf8_length(),
989 (char *) name->bytes(), name->utf8_length(),
990 (char *) sig->bytes(), sig->utf8_length());
991 #endif /* USDT2 */
992 return 0;
993 JRT_END
994
995 JRT_LEAF(int, SharedRuntime::dtrace_method_exit(
996 JavaThread* thread, Method* method))
997 assert(DTraceMethodProbes, "wrong call");
998 Symbol* kname = method->klass_name();
999 Symbol* name = method->name();
1000 Symbol* sig = method->signature();
1001 #ifndef USDT2
1002 HS_DTRACE_PROBE7(hotspot, method__return, get_java_tid(thread),
1003 kname->bytes(), kname->utf8_length(),
1004 name->bytes(), name->utf8_length(),
1005 sig->bytes(), sig->utf8_length());
1006 #else /* USDT2 */
1007 HOTSPOT_METHOD_RETURN(
1008 get_java_tid(thread),
1009 (char *) kname->bytes(), kname->utf8_length(),
1010 (char *) name->bytes(), name->utf8_length(),
1011 (char *) sig->bytes(), sig->utf8_length());
1012 #endif /* USDT2 */
1013 return 0;
1014 JRT_END
1015
1016
1017 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode)
1018 // for a call current in progress, i.e., arguments has been pushed on stack
1019 // put callee has not been invoked yet. Used by: resolve virtual/static,
1020 // vtable updates, etc. Caller frame must be compiled.
1021 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) {
1022 ResourceMark rm(THREAD);
1023
1024 // last java frame on stack (which includes native call frames)
1025 vframeStream vfst(thread, true); // Do not skip and javaCalls
1026
1027 return find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(Handle()));
1028 }
1029
1030
1031 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
1032 // for a call current in progress, i.e., arguments has been pushed on stack
1033 // but callee has not been invoked yet. Caller frame must be compiled.
1034 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread,
1035 vframeStream& vfst,
1036 Bytecodes::Code& bc,
1037 CallInfo& callinfo, TRAPS) {
1038 Handle receiver;
1039 Handle nullHandle; //create a handy null handle for exception returns
1040
1041 assert(!vfst.at_end(), "Java frame must exist");
1042
1043 // Find caller and bci from vframe
1044 methodHandle caller(THREAD, vfst.method());
1045 int bci = vfst.bci();
1046
1047 // Find bytecode
1048 Bytecode_invoke bytecode(caller, bci);
1049 bc = bytecode.invoke_code();
1050 int bytecode_index = bytecode.index();
1051
1052 // Find receiver for non-static call
1053 if (bc != Bytecodes::_invokestatic &&
1054 bc != Bytecodes::_invokedynamic &&
1055 bc != Bytecodes::_invokehandle) {
1056 // This register map must be update since we need to find the receiver for
1057 // compiled frames. The receiver might be in a register.
1058 RegisterMap reg_map2(thread);
1059 frame stubFrame = thread->last_frame();
1060 // Caller-frame is a compiled frame
1061 frame callerFrame = stubFrame.sender(®_map2);
1062
1063 methodHandle callee = bytecode.static_target(CHECK_(nullHandle));
1064 if (callee.is_null()) {
1065 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1066 }
1067 // Retrieve from a compiled argument list
1068 receiver = Handle(THREAD, callerFrame.retrieve_receiver(®_map2));
1069
1070 if (receiver.is_null()) {
1071 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1072 }
1073 }
1074
1075 // Resolve method. This is parameterized by bytecode.
1076 constantPoolHandle constants(THREAD, caller->constants());
1077 assert(receiver.is_null() || receiver->is_oop(), "wrong receiver");
1078 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_(nullHandle));
1079
1080 #ifdef ASSERT
1081 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1082 if (bc != Bytecodes::_invokestatic && bc != Bytecodes::_invokedynamic && bc != Bytecodes::_invokehandle) {
1083 assert(receiver.not_null(), "should have thrown exception");
1084 KlassHandle receiver_klass(THREAD, receiver->klass());
1085 Klass* rk = constants->klass_ref_at(bytecode_index, CHECK_(nullHandle));
1086 // klass is already loaded
1087 KlassHandle static_receiver_klass(THREAD, rk);
1088 // Method handle invokes might have been optimized to a direct call
1089 // so don't check for the receiver class.
1090 // FIXME this weakens the assert too much
1091 methodHandle callee = callinfo.selected_method();
1092 assert(receiver_klass->is_subtype_of(static_receiver_klass()) ||
1093 callee->is_method_handle_intrinsic() ||
1094 callee->is_compiled_lambda_form(),
1095 "actual receiver must be subclass of static receiver klass");
1096 if (receiver_klass->oop_is_instance()) {
1097 if (InstanceKlass::cast(receiver_klass())->is_not_initialized()) {
1098 tty->print_cr("ERROR: Klass not yet initialized!!");
1099 receiver_klass()->print();
1100 }
1101 assert(!InstanceKlass::cast(receiver_klass())->is_not_initialized(), "receiver_klass must be initialized");
1102 }
1103 }
1104 #endif
1105
1106 return receiver;
1107 }
1108
1109 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) {
1110 ResourceMark rm(THREAD);
1111 // We need first to check if any Java activations (compiled, interpreted)
1112 // exist on the stack since last JavaCall. If not, we need
1113 // to get the target method from the JavaCall wrapper.
1114 vframeStream vfst(thread, true); // Do not skip any javaCalls
1115 methodHandle callee_method;
1116 if (vfst.at_end()) {
1117 // No Java frames were found on stack since we did the JavaCall.
1118 // Hence the stack can only contain an entry_frame. We need to
1119 // find the target method from the stub frame.
1120 RegisterMap reg_map(thread, false);
1121 frame fr = thread->last_frame();
1122 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1123 fr = fr.sender(®_map);
1124 assert(fr.is_entry_frame(), "must be");
1125 // fr is now pointing to the entry frame.
1126 callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method());
1127 assert(fr.entry_frame_call_wrapper()->receiver() == NULL || !callee_method->is_static(), "non-null receiver for static call??");
1128 } else {
1129 Bytecodes::Code bc;
1130 CallInfo callinfo;
1131 find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle()));
1132 callee_method = callinfo.selected_method();
1133 }
1134 assert(callee_method()->is_method(), "must be");
1135 return callee_method;
1136 }
1137
1138 // Resolves a call.
1139 methodHandle SharedRuntime::resolve_helper(JavaThread *thread,
1140 bool is_virtual,
1141 bool is_optimized, TRAPS) {
1142 methodHandle callee_method;
1143 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1144 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
1145 int retry_count = 0;
1146 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() &&
1147 callee_method->method_holder() != SystemDictionary::Object_klass()) {
1148 // If has a pending exception then there is no need to re-try to
1149 // resolve this method.
1150 // If the method has been redefined, we need to try again.
1151 // Hack: we have no way to update the vtables of arrays, so don't
1152 // require that java.lang.Object has been updated.
1153
1154 // It is very unlikely that method is redefined more than 100 times
1155 // in the middle of resolve. If it is looping here more than 100 times
1156 // means then there could be a bug here.
1157 guarantee((retry_count++ < 100),
1158 "Could not resolve to latest version of redefined method");
1159 // method is redefined in the middle of resolve so re-try.
1160 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1161 }
1162 }
1163 return callee_method;
1164 }
1165
1166 // Resolves a call. The compilers generate code for calls that go here
1167 // and are patched with the real destination of the call.
1168 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread,
1169 bool is_virtual,
1170 bool is_optimized, TRAPS) {
1171
1172 ResourceMark rm(thread);
1173 RegisterMap cbl_map(thread, false);
1174 frame caller_frame = thread->last_frame().sender(&cbl_map);
1175
1176 CodeBlob* caller_cb = caller_frame.cb();
1177 guarantee(caller_cb != NULL && caller_cb->is_nmethod(), "must be called from nmethod");
1178 nmethod* caller_nm = caller_cb->as_nmethod_or_null();
1179 // make sure caller is not getting deoptimized
1180 // and removed before we are done with it.
1181 // CLEANUP - with lazy deopt shouldn't need this lock
1182 nmethodLocker caller_lock(caller_nm);
1183
1184
1185 // determine call info & receiver
1186 // note: a) receiver is NULL for static calls
1187 // b) an exception is thrown if receiver is NULL for non-static calls
1188 CallInfo call_info;
1189 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1190 Handle receiver = find_callee_info(thread, invoke_code,
1191 call_info, CHECK_(methodHandle()));
1192 methodHandle callee_method = call_info.selected_method();
1193
1194 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1195 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1196 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1197 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1198
1199 #ifndef PRODUCT
1200 // tracing/debugging/statistics
1201 int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
1202 (is_virtual) ? (&_resolve_virtual_ctr) :
1203 (&_resolve_static_ctr);
1204 Atomic::inc(addr);
1205
1206 if (TraceCallFixup) {
1207 ResourceMark rm(thread);
1208 tty->print("resolving %s%s (%s) call to",
1209 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
1210 Bytecodes::name(invoke_code));
1211 callee_method->print_short_name(tty);
1212 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT, caller_frame.pc(), callee_method->code());
1213 }
1214 #endif
1215
1216 // JSR 292 key invariant:
1217 // If the resolved method is a MethodHandle invoke target the call
1218 // site must be a MethodHandle call site, because the lambda form might tail-call
1219 // leaving the stack in a state unknown to either caller or callee
1220 // TODO detune for now but we might need it again
1221 // assert(!callee_method->is_compiled_lambda_form() ||
1222 // caller_nm->is_method_handle_return(caller_frame.pc()), "must be MH call site");
1223
1224 // Compute entry points. This might require generation of C2I converter
1225 // frames, so we cannot be holding any locks here. Furthermore, the
1226 // computation of the entry points is independent of patching the call. We
1227 // always return the entry-point, but we only patch the stub if the call has
1228 // not been deoptimized. Return values: For a virtual call this is an
1229 // (cached_oop, destination address) pair. For a static call/optimized
1230 // virtual this is just a destination address.
1231
1232 StaticCallInfo static_call_info;
1233 CompiledICInfo virtual_call_info;
1234
1235 // Make sure the callee nmethod does not get deoptimized and removed before
1236 // we are done patching the code.
1237 nmethod* callee_nm = callee_method->code();
1238 nmethodLocker nl_callee(callee_nm);
1239 #ifdef ASSERT
1240 address dest_entry_point = callee_nm == NULL ? 0 : callee_nm->entry_point(); // used below
1241 #endif
1242
1243 if (is_virtual) {
1244 assert(receiver.not_null() || invoke_code == Bytecodes::_invokehandle, "sanity check");
1245 bool static_bound = call_info.resolved_method()->can_be_statically_bound();
1246 KlassHandle h_klass(THREAD, invoke_code == Bytecodes::_invokehandle ? NULL : receiver->klass());
1247 CompiledIC::compute_monomorphic_entry(callee_method, h_klass,
1248 is_optimized, static_bound, virtual_call_info,
1249 CHECK_(methodHandle()));
1250 } else {
1251 // static call
1252 CompiledStaticCall::compute_entry(callee_method, static_call_info);
1253 }
1254
1255 // grab lock, check for deoptimization and potentially patch caller
1256 {
1257 MutexLocker ml_patch(CompiledIC_lock);
1258
1259 // Now that we are ready to patch if the Method* was redefined then
1260 // don't update call site and let the caller retry.
1261
1262 if (!callee_method->is_old()) {
1263 #ifdef ASSERT
1264 // We must not try to patch to jump to an already unloaded method.
1265 if (dest_entry_point != 0) {
1266 assert(CodeCache::find_blob(dest_entry_point) != NULL,
1267 "should not unload nmethod while locked");
1268 }
1269 #endif
1270 if (is_virtual) {
1271 nmethod* nm = callee_nm;
1272 if (nm == NULL) CodeCache::find_blob(caller_frame.pc());
1273 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1274 if (inline_cache->is_clean()) {
1275 inline_cache->set_to_monomorphic(virtual_call_info);
1276 }
1277 } else {
1278 CompiledStaticCall* ssc = compiledStaticCall_before(caller_frame.pc());
1279 if (ssc->is_clean()) ssc->set(static_call_info);
1280 }
1281 }
1282
1283 } // unlock CompiledIC_lock
1284
1285 return callee_method;
1286 }
1287
1288
1289 // Inline caches exist only in compiled code
1290 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread))
1291 #ifdef ASSERT
1292 RegisterMap reg_map(thread, false);
1293 frame stub_frame = thread->last_frame();
1294 assert(stub_frame.is_runtime_frame(), "sanity check");
1295 frame caller_frame = stub_frame.sender(®_map);
1296 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame");
1297 #endif /* ASSERT */
1298
1299 methodHandle callee_method;
1300 JRT_BLOCK
1301 callee_method = SharedRuntime::handle_ic_miss_helper(thread, CHECK_NULL);
1302 // Return Method* through TLS
1303 thread->set_vm_result_2(callee_method());
1304 JRT_BLOCK_END
1305 // return compiled code entry point after potential safepoints
1306 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1307 return callee_method->verified_code_entry();
1308 JRT_END
1309
1310
1311 // Handle call site that has been made non-entrant
1312 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread))
1313 // 6243940 We might end up in here if the callee is deoptimized
1314 // as we race to call it. We don't want to take a safepoint if
1315 // the caller was interpreted because the caller frame will look
1316 // interpreted to the stack walkers and arguments are now
1317 // "compiled" so it is much better to make this transition
1318 // invisible to the stack walking code. The i2c path will
1319 // place the callee method in the callee_target. It is stashed
1320 // there because if we try and find the callee by normal means a
1321 // safepoint is possible and have trouble gc'ing the compiled args.
1322 RegisterMap reg_map(thread, false);
1323 frame stub_frame = thread->last_frame();
1324 assert(stub_frame.is_runtime_frame(), "sanity check");
1325 frame caller_frame = stub_frame.sender(®_map);
1326
1327 if (caller_frame.is_interpreted_frame() ||
1328 caller_frame.is_entry_frame()) {
1329 Method* callee = thread->callee_target();
1330 guarantee(callee != NULL && callee->is_method(), "bad handshake");
1331 thread->set_vm_result_2(callee);
1332 thread->set_callee_target(NULL);
1333 return callee->get_c2i_entry();
1334 }
1335
1336 // Must be compiled to compiled path which is safe to stackwalk
1337 methodHandle callee_method;
1338 JRT_BLOCK
1339 // Force resolving of caller (if we called from compiled frame)
1340 callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_NULL);
1341 thread->set_vm_result_2(callee_method());
1342 JRT_BLOCK_END
1343 // return compiled code entry point after potential safepoints
1344 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1345 return callee_method->verified_code_entry();
1346 JRT_END
1347
1348
1349 // resolve a static call and patch code
1350 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread ))
1351 methodHandle callee_method;
1352 JRT_BLOCK
1353 callee_method = SharedRuntime::resolve_helper(thread, false, false, CHECK_NULL);
1354 thread->set_vm_result_2(callee_method());
1355 JRT_BLOCK_END
1356 // return compiled code entry point after potential safepoints
1357 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1358 return callee_method->verified_code_entry();
1359 JRT_END
1360
1361
1362 // resolve virtual call and update inline cache to monomorphic
1363 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread ))
1364 methodHandle callee_method;
1365 JRT_BLOCK
1366 callee_method = SharedRuntime::resolve_helper(thread, true, false, CHECK_NULL);
1367 thread->set_vm_result_2(callee_method());
1368 JRT_BLOCK_END
1369 // return compiled code entry point after potential safepoints
1370 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1371 return callee_method->verified_code_entry();
1372 JRT_END
1373
1374
1375 // Resolve a virtual call that can be statically bound (e.g., always
1376 // monomorphic, so it has no inline cache). Patch code to resolved target.
1377 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread))
1378 methodHandle callee_method;
1379 JRT_BLOCK
1380 callee_method = SharedRuntime::resolve_helper(thread, true, true, CHECK_NULL);
1381 thread->set_vm_result_2(callee_method());
1382 JRT_BLOCK_END
1383 // return compiled code entry point after potential safepoints
1384 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1385 return callee_method->verified_code_entry();
1386 JRT_END
1387
1388
1389
1390
1391
1392 methodHandle SharedRuntime::handle_ic_miss_helper(JavaThread *thread, TRAPS) {
1393 ResourceMark rm(thread);
1394 CallInfo call_info;
1395 Bytecodes::Code bc;
1396
1397 // receiver is NULL for static calls. An exception is thrown for NULL
1398 // receivers for non-static calls
1399 Handle receiver = find_callee_info(thread, bc, call_info,
1400 CHECK_(methodHandle()));
1401 // Compiler1 can produce virtual call sites that can actually be statically bound
1402 // If we fell thru to below we would think that the site was going megamorphic
1403 // when in fact the site can never miss. Worse because we'd think it was megamorphic
1404 // we'd try and do a vtable dispatch however methods that can be statically bound
1405 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a
1406 // reresolution of the call site (as if we did a handle_wrong_method and not an
1407 // plain ic_miss) and the site will be converted to an optimized virtual call site
1408 // never to miss again. I don't believe C2 will produce code like this but if it
1409 // did this would still be the correct thing to do for it too, hence no ifdef.
1410 //
1411 if (call_info.resolved_method()->can_be_statically_bound()) {
1412 methodHandle callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_(methodHandle()));
1413 if (TraceCallFixup) {
1414 RegisterMap reg_map(thread, false);
1415 frame caller_frame = thread->last_frame().sender(®_map);
1416 ResourceMark rm(thread);
1417 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc));
1418 callee_method->print_short_name(tty);
1419 tty->print_cr(" from pc: " INTPTR_FORMAT, caller_frame.pc());
1420 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1421 }
1422 return callee_method;
1423 }
1424
1425 methodHandle callee_method = call_info.selected_method();
1426
1427 bool should_be_mono = false;
1428
1429 #ifndef PRODUCT
1430 Atomic::inc(&_ic_miss_ctr);
1431
1432 // Statistics & Tracing
1433 if (TraceCallFixup) {
1434 ResourceMark rm(thread);
1435 tty->print("IC miss (%s) call to", Bytecodes::name(bc));
1436 callee_method->print_short_name(tty);
1437 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1438 }
1439
1440 if (ICMissHistogram) {
1441 MutexLocker m(VMStatistic_lock);
1442 RegisterMap reg_map(thread, false);
1443 frame f = thread->last_frame().real_sender(®_map);// skip runtime stub
1444 // produce statistics under the lock
1445 trace_ic_miss(f.pc());
1446 }
1447 #endif
1448
1449 // install an event collector so that when a vtable stub is created the
1450 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1451 // event can't be posted when the stub is created as locks are held
1452 // - instead the event will be deferred until the event collector goes
1453 // out of scope.
1454 JvmtiDynamicCodeEventCollector event_collector;
1455
1456 // Update inline cache to megamorphic. Skip update if caller has been
1457 // made non-entrant or we are called from interpreted.
1458 { MutexLocker ml_patch (CompiledIC_lock);
1459 RegisterMap reg_map(thread, false);
1460 frame caller_frame = thread->last_frame().sender(®_map);
1461 CodeBlob* cb = caller_frame.cb();
1462 if (cb->is_nmethod() && ((nmethod*)cb)->is_in_use()) {
1463 // Not a non-entrant nmethod, so find inline_cache
1464 CompiledIC* inline_cache = CompiledIC_before(((nmethod*)cb), caller_frame.pc());
1465 bool should_be_mono = false;
1466 if (inline_cache->is_optimized()) {
1467 if (TraceCallFixup) {
1468 ResourceMark rm(thread);
1469 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc));
1470 callee_method->print_short_name(tty);
1471 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1472 }
1473 should_be_mono = true;
1474 } else if (inline_cache->is_icholder_call()) {
1475 CompiledICHolder* ic_oop = inline_cache->cached_icholder();
1476 if ( ic_oop != NULL) {
1477
1478 if (receiver()->klass() == ic_oop->holder_klass()) {
1479 // This isn't a real miss. We must have seen that compiled code
1480 // is now available and we want the call site converted to a
1481 // monomorphic compiled call site.
1482 // We can't assert for callee_method->code() != NULL because it
1483 // could have been deoptimized in the meantime
1484 if (TraceCallFixup) {
1485 ResourceMark rm(thread);
1486 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc));
1487 callee_method->print_short_name(tty);
1488 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1489 }
1490 should_be_mono = true;
1491 }
1492 }
1493 }
1494
1495 if (should_be_mono) {
1496
1497 // We have a path that was monomorphic but was going interpreted
1498 // and now we have (or had) a compiled entry. We correct the IC
1499 // by using a new icBuffer.
1500 CompiledICInfo info;
1501 KlassHandle receiver_klass(THREAD, receiver()->klass());
1502 inline_cache->compute_monomorphic_entry(callee_method,
1503 receiver_klass,
1504 inline_cache->is_optimized(),
1505 false,
1506 info, CHECK_(methodHandle()));
1507 inline_cache->set_to_monomorphic(info);
1508 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) {
1509 // Potential change to megamorphic
1510 bool successful = inline_cache->set_to_megamorphic(&call_info, bc, CHECK_(methodHandle()));
1511 if (!successful) {
1512 inline_cache->set_to_clean();
1513 }
1514 } else {
1515 // Either clean or megamorphic
1516 }
1517 }
1518 } // Release CompiledIC_lock
1519
1520 return callee_method;
1521 }
1522
1523 //
1524 // Resets a call-site in compiled code so it will get resolved again.
1525 // This routines handles both virtual call sites, optimized virtual call
1526 // sites, and static call sites. Typically used to change a call sites
1527 // destination from compiled to interpreted.
1528 //
1529 methodHandle SharedRuntime::reresolve_call_site(JavaThread *thread, TRAPS) {
1530 ResourceMark rm(thread);
1531 RegisterMap reg_map(thread, false);
1532 frame stub_frame = thread->last_frame();
1533 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1534 frame caller = stub_frame.sender(®_map);
1535
1536 // Do nothing if the frame isn't a live compiled frame.
1537 // nmethod could be deoptimized by the time we get here
1538 // so no update to the caller is needed.
1539
1540 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) {
1541
1542 address pc = caller.pc();
1543
1544 // Default call_addr is the location of the "basic" call.
1545 // Determine the address of the call we a reresolving. With
1546 // Inline Caches we will always find a recognizable call.
1547 // With Inline Caches disabled we may or may not find a
1548 // recognizable call. We will always find a call for static
1549 // calls and for optimized virtual calls. For vanilla virtual
1550 // calls it depends on the state of the UseInlineCaches switch.
1551 //
1552 // With Inline Caches disabled we can get here for a virtual call
1553 // for two reasons:
1554 // 1 - calling an abstract method. The vtable for abstract methods
1555 // will run us thru handle_wrong_method and we will eventually
1556 // end up in the interpreter to throw the ame.
1557 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1558 // call and between the time we fetch the entry address and
1559 // we jump to it the target gets deoptimized. Similar to 1
1560 // we will wind up in the interprter (thru a c2i with c2).
1561 //
1562 address call_addr = NULL;
1563 {
1564 // Get call instruction under lock because another thread may be
1565 // busy patching it.
1566 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1567 // Location of call instruction
1568 if (NativeCall::is_call_before(pc)) {
1569 NativeCall *ncall = nativeCall_before(pc);
1570 call_addr = ncall->instruction_address();
1571 }
1572 }
1573
1574 // Check for static or virtual call
1575 bool is_static_call = false;
1576 nmethod* caller_nm = CodeCache::find_nmethod(pc);
1577 // Make sure nmethod doesn't get deoptimized and removed until
1578 // this is done with it.
1579 // CLEANUP - with lazy deopt shouldn't need this lock
1580 nmethodLocker nmlock(caller_nm);
1581
1582 if (call_addr != NULL) {
1583 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1584 int ret = iter.next(); // Get item
1585 if (ret) {
1586 assert(iter.addr() == call_addr, "must find call");
1587 if (iter.type() == relocInfo::static_call_type) {
1588 is_static_call = true;
1589 } else {
1590 assert(iter.type() == relocInfo::virtual_call_type ||
1591 iter.type() == relocInfo::opt_virtual_call_type
1592 , "unexpected relocInfo. type");
1593 }
1594 } else {
1595 assert(!UseInlineCaches, "relocation info. must exist for this address");
1596 }
1597
1598 // Cleaning the inline cache will force a new resolve. This is more robust
1599 // than directly setting it to the new destination, since resolving of calls
1600 // is always done through the same code path. (experience shows that it
1601 // leads to very hard to track down bugs, if an inline cache gets updated
1602 // to a wrong method). It should not be performance critical, since the
1603 // resolve is only done once.
1604
1605 MutexLocker ml(CompiledIC_lock);
1606 //
1607 // We do not patch the call site if the nmethod has been made non-entrant
1608 // as it is a waste of time
1609 //
1610 if (caller_nm->is_in_use()) {
1611 if (is_static_call) {
1612 CompiledStaticCall* ssc= compiledStaticCall_at(call_addr);
1613 ssc->set_to_clean();
1614 } else {
1615 // compiled, dispatched call (which used to call an interpreted method)
1616 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1617 inline_cache->set_to_clean();
1618 }
1619 }
1620 }
1621
1622 }
1623
1624 methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle()));
1625
1626
1627 #ifndef PRODUCT
1628 Atomic::inc(&_wrong_method_ctr);
1629
1630 if (TraceCallFixup) {
1631 ResourceMark rm(thread);
1632 tty->print("handle_wrong_method reresolving call to");
1633 callee_method->print_short_name(tty);
1634 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1635 }
1636 #endif
1637
1638 return callee_method;
1639 }
1640
1641 #ifdef ASSERT
1642 void SharedRuntime::check_member_name_argument_is_last_argument(methodHandle method,
1643 const BasicType* sig_bt,
1644 const VMRegPair* regs) {
1645 ResourceMark rm;
1646 const int total_args_passed = method->size_of_parameters();
1647 const VMRegPair* regs_with_member_name = regs;
1648 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1);
1649
1650 const int member_arg_pos = total_args_passed - 1;
1651 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob");
1652 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object");
1653
1654 const bool is_outgoing = method->is_method_handle_intrinsic();
1655 int comp_args_on_stack = java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1, is_outgoing);
1656
1657 for (int i = 0; i < member_arg_pos; i++) {
1658 VMReg a = regs_with_member_name[i].first();
1659 VMReg b = regs_without_member_name[i].first();
1660 assert(a->value() == b->value(), err_msg_res("register allocation mismatch: a=%d, b=%d", a->value(), b->value()));
1661 }
1662 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg");
1663 }
1664 #endif
1665
1666 // ---------------------------------------------------------------------------
1667 // We are calling the interpreter via a c2i. Normally this would mean that
1668 // we were called by a compiled method. However we could have lost a race
1669 // where we went int -> i2c -> c2i and so the caller could in fact be
1670 // interpreted. If the caller is compiled we attempt to patch the caller
1671 // so he no longer calls into the interpreter.
1672 IRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc))
1673 Method* moop(method);
1674
1675 address entry_point = moop->from_compiled_entry();
1676
1677 // It's possible that deoptimization can occur at a call site which hasn't
1678 // been resolved yet, in which case this function will be called from
1679 // an nmethod that has been patched for deopt and we can ignore the
1680 // request for a fixup.
1681 // Also it is possible that we lost a race in that from_compiled_entry
1682 // is now back to the i2c in that case we don't need to patch and if
1683 // we did we'd leap into space because the callsite needs to use
1684 // "to interpreter" stub in order to load up the Method*. Don't
1685 // ask me how I know this...
1686
1687 CodeBlob* cb = CodeCache::find_blob(caller_pc);
1688 if (!cb->is_nmethod() || entry_point == moop->get_c2i_entry()) {
1689 return;
1690 }
1691
1692 // The check above makes sure this is a nmethod.
1693 nmethod* nm = cb->as_nmethod_or_null();
1694 assert(nm, "must be");
1695
1696 // Get the return PC for the passed caller PC.
1697 address return_pc = caller_pc + frame::pc_return_offset;
1698
1699 // There is a benign race here. We could be attempting to patch to a compiled
1700 // entry point at the same time the callee is being deoptimized. If that is
1701 // the case then entry_point may in fact point to a c2i and we'd patch the
1702 // call site with the same old data. clear_code will set code() to NULL
1703 // at the end of it. If we happen to see that NULL then we can skip trying
1704 // to patch. If we hit the window where the callee has a c2i in the
1705 // from_compiled_entry and the NULL isn't present yet then we lose the race
1706 // and patch the code with the same old data. Asi es la vida.
1707
1708 if (moop->code() == NULL) return;
1709
1710 if (nm->is_in_use()) {
1711
1712 // Expect to find a native call there (unless it was no-inline cache vtable dispatch)
1713 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1714 if (NativeCall::is_call_before(return_pc)) {
1715 NativeCall *call = nativeCall_before(return_pc);
1716 //
1717 // bug 6281185. We might get here after resolving a call site to a vanilla
1718 // virtual call. Because the resolvee uses the verified entry it may then
1719 // see compiled code and attempt to patch the site by calling us. This would
1720 // then incorrectly convert the call site to optimized and its downhill from
1721 // there. If you're lucky you'll get the assert in the bugid, if not you've
1722 // just made a call site that could be megamorphic into a monomorphic site
1723 // for the rest of its life! Just another racing bug in the life of
1724 // fixup_callers_callsite ...
1725 //
1726 RelocIterator iter(nm, call->instruction_address(), call->next_instruction_address());
1727 iter.next();
1728 assert(iter.has_current(), "must have a reloc at java call site");
1729 relocInfo::relocType typ = iter.reloc()->type();
1730 if ( typ != relocInfo::static_call_type &&
1731 typ != relocInfo::opt_virtual_call_type &&
1732 typ != relocInfo::static_stub_type) {
1733 return;
1734 }
1735 address destination = call->destination();
1736 if (destination != entry_point) {
1737 CodeBlob* callee = CodeCache::find_blob(destination);
1738 // callee == cb seems weird. It means calling interpreter thru stub.
1739 if (callee == cb || callee->is_adapter_blob()) {
1740 // static call or optimized virtual
1741 if (TraceCallFixup) {
1742 tty->print("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 call->set_destination_mt_safe(entry_point);
1747 } else {
1748 if (TraceCallFixup) {
1749 tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);
1750 moop->print_short_name(tty);
1751 tty->print_cr(" to " INTPTR_FORMAT, entry_point);
1752 }
1753 // assert is too strong could also be resolve destinations.
1754 // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be");
1755 }
1756 } else {
1757 if (TraceCallFixup) {
1758 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);
1759 moop->print_short_name(tty);
1760 tty->print_cr(" to " INTPTR_FORMAT, entry_point);
1761 }
1762 }
1763 }
1764 }
1765 IRT_END
1766
1767
1768 // same as JVM_Arraycopy, but called directly from compiled code
1769 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos,
1770 oopDesc* dest, jint dest_pos,
1771 jint length,
1772 JavaThread* thread)) {
1773 #ifndef PRODUCT
1774 _slow_array_copy_ctr++;
1775 #endif
1776 // Check if we have null pointers
1777 if (src == NULL || dest == NULL) {
1778 THROW(vmSymbols::java_lang_NullPointerException());
1779 }
1780 // Do the copy. The casts to arrayOop are necessary to the copy_array API,
1781 // even though the copy_array API also performs dynamic checks to ensure
1782 // that src and dest are truly arrays (and are conformable).
1783 // The copy_array mechanism is awkward and could be removed, but
1784 // the compilers don't call this function except as a last resort,
1785 // so it probably doesn't matter.
1786 src->klass()->copy_array((arrayOopDesc*)src, src_pos,
1787 (arrayOopDesc*)dest, dest_pos,
1788 length, thread);
1789 }
1790 JRT_END
1791
1792 char* SharedRuntime::generate_class_cast_message(
1793 JavaThread* thread, const char* objName) {
1794
1795 // Get target class name from the checkcast instruction
1796 vframeStream vfst(thread, true);
1797 assert(!vfst.at_end(), "Java frame must exist");
1798 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci()));
1799 Klass* targetKlass = vfst.method()->constants()->klass_at(
1800 cc.index(), thread);
1801 return generate_class_cast_message(objName, targetKlass->external_name());
1802 }
1803
1804 char* SharedRuntime::generate_class_cast_message(
1805 const char* objName, const char* targetKlassName, const char* desc) {
1806 size_t msglen = strlen(objName) + strlen(desc) + strlen(targetKlassName) + 1;
1807
1808 char* message = NEW_RESOURCE_ARRAY(char, msglen);
1809 if (NULL == message) {
1810 // Shouldn't happen, but don't cause even more problems if it does
1811 message = const_cast<char*>(objName);
1812 } else {
1813 jio_snprintf(message, msglen, "%s%s%s", objName, desc, targetKlassName);
1814 }
1815 return message;
1816 }
1817
1818 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
1819 (void) JavaThread::current()->reguard_stack();
1820 JRT_END
1821
1822
1823 // Handles the uncommon case in locking, i.e., contention or an inflated lock.
1824 #ifndef PRODUCT
1825 int SharedRuntime::_monitor_enter_ctr=0;
1826 #endif
1827 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread))
1828 oop obj(_obj);
1829 #ifndef PRODUCT
1830 _monitor_enter_ctr++; // monitor enter slow
1831 #endif
1832 if (PrintBiasedLockingStatistics) {
1833 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
1834 }
1835 Handle h_obj(THREAD, obj);
1836 if (UseBiasedLocking) {
1837 // Retry fast entry if bias is revoked to avoid unnecessary inflation
1838 ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK);
1839 } else {
1840 ObjectSynchronizer::slow_enter(h_obj, lock, CHECK);
1841 }
1842 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
1843 JRT_END
1844
1845 #ifndef PRODUCT
1846 int SharedRuntime::_monitor_exit_ctr=0;
1847 #endif
1848 // Handles the uncommon cases of monitor unlocking in compiled code
1849 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock))
1850 oop obj(_obj);
1851 #ifndef PRODUCT
1852 _monitor_exit_ctr++; // monitor exit slow
1853 #endif
1854 Thread* THREAD = JavaThread::current();
1855 // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore
1856 // testing was unable to ever fire the assert that guarded it so I have removed it.
1857 assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?");
1858 #undef MIGHT_HAVE_PENDING
1859 #ifdef MIGHT_HAVE_PENDING
1860 // Save and restore any pending_exception around the exception mark.
1861 // While the slow_exit must not throw an exception, we could come into
1862 // this routine with one set.
1863 oop pending_excep = NULL;
1864 const char* pending_file;
1865 int pending_line;
1866 if (HAS_PENDING_EXCEPTION) {
1867 pending_excep = PENDING_EXCEPTION;
1868 pending_file = THREAD->exception_file();
1869 pending_line = THREAD->exception_line();
1870 CLEAR_PENDING_EXCEPTION;
1871 }
1872 #endif /* MIGHT_HAVE_PENDING */
1873
1874 {
1875 // Exit must be non-blocking, and therefore no exceptions can be thrown.
1876 EXCEPTION_MARK;
1877 ObjectSynchronizer::slow_exit(obj, lock, THREAD);
1878 }
1879
1880 #ifdef MIGHT_HAVE_PENDING
1881 if (pending_excep != NULL) {
1882 THREAD->set_pending_exception(pending_excep, pending_file, pending_line);
1883 }
1884 #endif /* MIGHT_HAVE_PENDING */
1885 JRT_END
1886
1887 #ifndef PRODUCT
1888
1889 void SharedRuntime::print_statistics() {
1890 ttyLocker ttyl;
1891 if (xtty != NULL) xtty->head("statistics type='SharedRuntime'");
1892
1893 if (_monitor_enter_ctr ) tty->print_cr("%5d monitor enter slow", _monitor_enter_ctr);
1894 if (_monitor_exit_ctr ) tty->print_cr("%5d monitor exit slow", _monitor_exit_ctr);
1895 if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr);
1896
1897 SharedRuntime::print_ic_miss_histogram();
1898
1899 if (CountRemovableExceptions) {
1900 if (_nof_removable_exceptions > 0) {
1901 Unimplemented(); // this counter is not yet incremented
1902 tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions);
1903 }
1904 }
1905
1906 // Dump the JRT_ENTRY counters
1907 if( _new_instance_ctr ) tty->print_cr("%5d new instance requires GC", _new_instance_ctr);
1908 if( _new_array_ctr ) tty->print_cr("%5d new array requires GC", _new_array_ctr);
1909 if( _multi1_ctr ) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr);
1910 if( _multi2_ctr ) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr);
1911 if( _multi3_ctr ) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr);
1912 if( _multi4_ctr ) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr);
1913 if( _multi5_ctr ) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr);
1914
1915 tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr );
1916 tty->print_cr("%5d wrong method", _wrong_method_ctr );
1917 tty->print_cr("%5d unresolved static call site", _resolve_static_ctr );
1918 tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr );
1919 tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr );
1920
1921 if( _mon_enter_stub_ctr ) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr );
1922 if( _mon_exit_stub_ctr ) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr );
1923 if( _mon_enter_ctr ) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr );
1924 if( _mon_exit_ctr ) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr );
1925 if( _partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr );
1926 if( _jbyte_array_copy_ctr ) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr );
1927 if( _jshort_array_copy_ctr ) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr );
1928 if( _jint_array_copy_ctr ) tty->print_cr("%5d int array copies", _jint_array_copy_ctr );
1929 if( _jlong_array_copy_ctr ) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr );
1930 if( _oop_array_copy_ctr ) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr );
1931 if( _checkcast_array_copy_ctr ) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr );
1932 if( _unsafe_array_copy_ctr ) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr );
1933 if( _generic_array_copy_ctr ) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr );
1934 if( _slow_array_copy_ctr ) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr );
1935 if( _find_handler_ctr ) tty->print_cr("%5d find exception handler", _find_handler_ctr );
1936 if( _rethrow_ctr ) tty->print_cr("%5d rethrow handler", _rethrow_ctr );
1937
1938 AdapterHandlerLibrary::print_statistics();
1939
1940 if (xtty != NULL) xtty->tail("statistics");
1941 }
1942
1943 inline double percent(int x, int y) {
1944 return 100.0 * x / MAX2(y, 1);
1945 }
1946
1947 class MethodArityHistogram {
1948 public:
1949 enum { MAX_ARITY = 256 };
1950 private:
1951 static int _arity_histogram[MAX_ARITY]; // histogram of #args
1952 static int _size_histogram[MAX_ARITY]; // histogram of arg size in words
1953 static int _max_arity; // max. arity seen
1954 static int _max_size; // max. arg size seen
1955
1956 static void add_method_to_histogram(nmethod* nm) {
1957 Method* m = nm->method();
1958 ArgumentCount args(m->signature());
1959 int arity = args.size() + (m->is_static() ? 0 : 1);
1960 int argsize = m->size_of_parameters();
1961 arity = MIN2(arity, MAX_ARITY-1);
1962 argsize = MIN2(argsize, MAX_ARITY-1);
1963 int count = nm->method()->compiled_invocation_count();
1964 _arity_histogram[arity] += count;
1965 _size_histogram[argsize] += count;
1966 _max_arity = MAX2(_max_arity, arity);
1967 _max_size = MAX2(_max_size, argsize);
1968 }
1969
1970 void print_histogram_helper(int n, int* histo, const char* name) {
1971 const int N = MIN2(5, n);
1972 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
1973 double sum = 0;
1974 double weighted_sum = 0;
1975 int i;
1976 for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; }
1977 double rest = sum;
1978 double percent = sum / 100;
1979 for (i = 0; i <= N; i++) {
1980 rest -= histo[i];
1981 tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent);
1982 }
1983 tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent);
1984 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n);
1985 }
1986
1987 void print_histogram() {
1988 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
1989 print_histogram_helper(_max_arity, _arity_histogram, "arity");
1990 tty->print_cr("\nSame for parameter size (in words):");
1991 print_histogram_helper(_max_size, _size_histogram, "size");
1992 tty->cr();
1993 }
1994
1995 public:
1996 MethodArityHistogram() {
1997 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1998 _max_arity = _max_size = 0;
1999 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram [i] = 0;
2000 CodeCache::nmethods_do(add_method_to_histogram);
2001 print_histogram();
2002 }
2003 };
2004
2005 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY];
2006 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY];
2007 int MethodArityHistogram::_max_arity;
2008 int MethodArityHistogram::_max_size;
2009
2010 void SharedRuntime::print_call_statistics(int comp_total) {
2011 tty->print_cr("Calls from compiled code:");
2012 int total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls;
2013 int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls;
2014 int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls;
2015 tty->print_cr("\t%9d (%4.1f%%) total non-inlined ", total, percent(total, total));
2016 tty->print_cr("\t%9d (%4.1f%%) virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total));
2017 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls));
2018 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls));
2019 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_c, percent(mono_c, _nof_normal_calls));
2020 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls));
2021 tty->print_cr("\t%9d (%4.1f%%) interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total));
2022 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls));
2023 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls));
2024 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_i, percent(mono_i, _nof_interface_calls));
2025 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls));
2026 tty->print_cr("\t%9d (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total));
2027 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls));
2028 tty->cr();
2029 tty->print_cr("Note 1: counter updates are not MT-safe.");
2030 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
2031 tty->print_cr(" %% in nested categories are relative to their category");
2032 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
2033 tty->cr();
2034
2035 MethodArityHistogram h;
2036 }
2037 #endif
2038
2039
2040 // A simple wrapper class around the calling convention information
2041 // that allows sharing of adapters for the same calling convention.
2042 class AdapterFingerPrint : public CHeapObj<mtCode> {
2043 private:
2044 enum {
2045 _basic_type_bits = 4,
2046 _basic_type_mask = right_n_bits(_basic_type_bits),
2047 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2048 _compact_int_count = 3
2049 };
2050 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2051 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2052
2053 union {
2054 int _compact[_compact_int_count];
2055 int* _fingerprint;
2056 } _value;
2057 int _length; // A negative length indicates the fingerprint is in the compact form,
2058 // Otherwise _value._fingerprint is the array.
2059
2060 // Remap BasicTypes that are handled equivalently by the adapters.
2061 // These are correct for the current system but someday it might be
2062 // necessary to make this mapping platform dependent.
2063 static int adapter_encoding(BasicType in) {
2064 switch(in) {
2065 case T_BOOLEAN:
2066 case T_BYTE:
2067 case T_SHORT:
2068 case T_CHAR:
2069 // There are all promoted to T_INT in the calling convention
2070 return T_INT;
2071
2072 case T_OBJECT:
2073 case T_ARRAY:
2074 // In other words, we assume that any register good enough for
2075 // an int or long is good enough for a managed pointer.
2076 #ifdef _LP64
2077 return T_LONG;
2078 #else
2079 return T_INT;
2080 #endif
2081
2082 case T_INT:
2083 case T_LONG:
2084 case T_FLOAT:
2085 case T_DOUBLE:
2086 case T_VOID:
2087 return in;
2088
2089 default:
2090 ShouldNotReachHere();
2091 return T_CONFLICT;
2092 }
2093 }
2094
2095 public:
2096 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) {
2097 // The fingerprint is based on the BasicType signature encoded
2098 // into an array of ints with eight entries per int.
2099 int* ptr;
2100 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int;
2101 if (len <= _compact_int_count) {
2102 assert(_compact_int_count == 3, "else change next line");
2103 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0;
2104 // Storing the signature encoded as signed chars hits about 98%
2105 // of the time.
2106 _length = -len;
2107 ptr = _value._compact;
2108 } else {
2109 _length = len;
2110 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode);
2111 ptr = _value._fingerprint;
2112 }
2113
2114 // Now pack the BasicTypes with 8 per int
2115 int sig_index = 0;
2116 for (int index = 0; index < len; index++) {
2117 int value = 0;
2118 for (int byte = 0; byte < _basic_types_per_int; byte++) {
2119 int bt = ((sig_index < total_args_passed)
2120 ? adapter_encoding(sig_bt[sig_index++])
2121 : 0);
2122 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits");
2123 value = (value << _basic_type_bits) | bt;
2124 }
2125 ptr[index] = value;
2126 }
2127 }
2128
2129 ~AdapterFingerPrint() {
2130 if (_length > 0) {
2131 FREE_C_HEAP_ARRAY(int, _value._fingerprint, mtCode);
2132 }
2133 }
2134
2135 int value(int index) {
2136 if (_length < 0) {
2137 return _value._compact[index];
2138 }
2139 return _value._fingerprint[index];
2140 }
2141 int length() {
2142 if (_length < 0) return -_length;
2143 return _length;
2144 }
2145
2146 bool is_compact() {
2147 return _length <= 0;
2148 }
2149
2150 unsigned int compute_hash() {
2151 int hash = 0;
2152 for (int i = 0; i < length(); i++) {
2153 int v = value(i);
2154 hash = (hash << 8) ^ v ^ (hash >> 5);
2155 }
2156 return (unsigned int)hash;
2157 }
2158
2159 const char* as_string() {
2160 stringStream st;
2161 st.print("0x");
2162 for (int i = 0; i < length(); i++) {
2163 st.print("%08x", value(i));
2164 }
2165 return st.as_string();
2166 }
2167
2168 bool equals(AdapterFingerPrint* other) {
2169 if (other->_length != _length) {
2170 return false;
2171 }
2172 if (_length < 0) {
2173 assert(_compact_int_count == 3, "else change next line");
2174 return _value._compact[0] == other->_value._compact[0] &&
2175 _value._compact[1] == other->_value._compact[1] &&
2176 _value._compact[2] == other->_value._compact[2];
2177 } else {
2178 for (int i = 0; i < _length; i++) {
2179 if (_value._fingerprint[i] != other->_value._fingerprint[i]) {
2180 return false;
2181 }
2182 }
2183 }
2184 return true;
2185 }
2186 };
2187
2188
2189 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
2190 class AdapterHandlerTable : public BasicHashtable<mtCode> {
2191 friend class AdapterHandlerTableIterator;
2192
2193 private:
2194
2195 #ifndef PRODUCT
2196 static int _lookups; // number of calls to lookup
2197 static int _buckets; // number of buckets checked
2198 static int _equals; // number of buckets checked with matching hash
2199 static int _hits; // number of successful lookups
2200 static int _compact; // number of equals calls with compact signature
2201 #endif
2202
2203 AdapterHandlerEntry* bucket(int i) {
2204 return (AdapterHandlerEntry*)BasicHashtable<mtCode>::bucket(i);
2205 }
2206
2207 public:
2208 AdapterHandlerTable()
2209 : BasicHashtable<mtCode>(293, sizeof(AdapterHandlerEntry)) { }
2210
2211 // Create a new entry suitable for insertion in the table
2212 AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
2213 AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable<mtCode>::new_entry(fingerprint->compute_hash());
2214 entry->init(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
2215 return entry;
2216 }
2217
2218 // Insert an entry into the table
2219 void add(AdapterHandlerEntry* entry) {
2220 int index = hash_to_index(entry->hash());
2221 add_entry(index, entry);
2222 }
2223
2224 void free_entry(AdapterHandlerEntry* entry) {
2225 entry->deallocate();
2226 BasicHashtable<mtCode>::free_entry(entry);
2227 }
2228
2229 // Find a entry with the same fingerprint if it exists
2230 AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) {
2231 NOT_PRODUCT(_lookups++);
2232 AdapterFingerPrint fp(total_args_passed, sig_bt);
2233 unsigned int hash = fp.compute_hash();
2234 int index = hash_to_index(hash);
2235 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2236 NOT_PRODUCT(_buckets++);
2237 if (e->hash() == hash) {
2238 NOT_PRODUCT(_equals++);
2239 if (fp.equals(e->fingerprint())) {
2240 #ifndef PRODUCT
2241 if (fp.is_compact()) _compact++;
2242 _hits++;
2243 #endif
2244 return e;
2245 }
2246 }
2247 }
2248 return NULL;
2249 }
2250
2251 #ifndef PRODUCT
2252 void print_statistics() {
2253 ResourceMark rm;
2254 int longest = 0;
2255 int empty = 0;
2256 int total = 0;
2257 int nonempty = 0;
2258 for (int index = 0; index < table_size(); index++) {
2259 int count = 0;
2260 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2261 count++;
2262 }
2263 if (count != 0) nonempty++;
2264 if (count == 0) empty++;
2265 if (count > longest) longest = count;
2266 total += count;
2267 }
2268 tty->print_cr("AdapterHandlerTable: empty %d longest %d total %d average %f",
2269 empty, longest, total, total / (double)nonempty);
2270 tty->print_cr("AdapterHandlerTable: lookups %d buckets %d equals %d hits %d compact %d",
2271 _lookups, _buckets, _equals, _hits, _compact);
2272 }
2273 #endif
2274 };
2275
2276
2277 #ifndef PRODUCT
2278
2279 int AdapterHandlerTable::_lookups;
2280 int AdapterHandlerTable::_buckets;
2281 int AdapterHandlerTable::_equals;
2282 int AdapterHandlerTable::_hits;
2283 int AdapterHandlerTable::_compact;
2284
2285 #endif
2286
2287 class AdapterHandlerTableIterator : public StackObj {
2288 private:
2289 AdapterHandlerTable* _table;
2290 int _index;
2291 AdapterHandlerEntry* _current;
2292
2293 void scan() {
2294 while (_index < _table->table_size()) {
2295 AdapterHandlerEntry* a = _table->bucket(_index);
2296 _index++;
2297 if (a != NULL) {
2298 _current = a;
2299 return;
2300 }
2301 }
2302 }
2303
2304 public:
2305 AdapterHandlerTableIterator(AdapterHandlerTable* table): _table(table), _index(0), _current(NULL) {
2306 scan();
2307 }
2308 bool has_next() {
2309 return _current != NULL;
2310 }
2311 AdapterHandlerEntry* next() {
2312 if (_current != NULL) {
2313 AdapterHandlerEntry* result = _current;
2314 _current = _current->next();
2315 if (_current == NULL) scan();
2316 return result;
2317 } else {
2318 return NULL;
2319 }
2320 }
2321 };
2322
2323
2324 // ---------------------------------------------------------------------------
2325 // Implementation of AdapterHandlerLibrary
2326 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL;
2327 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL;
2328 const int AdapterHandlerLibrary_size = 16*K;
2329 BufferBlob* AdapterHandlerLibrary::_buffer = NULL;
2330
2331 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2332 // Should be called only when AdapterHandlerLibrary_lock is active.
2333 if (_buffer == NULL) // Initialize lazily
2334 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2335 return _buffer;
2336 }
2337
2338 void AdapterHandlerLibrary::initialize() {
2339 if (_adapters != NULL) return;
2340 _adapters = new AdapterHandlerTable();
2341
2342 // Create a special handler for abstract methods. Abstract methods
2343 // are never compiled so an i2c entry is somewhat meaningless, but
2344 // fill it in with something appropriate just in case. Pass handle
2345 // wrong method for the c2i transitions.
2346 address wrong_method = SharedRuntime::get_handle_wrong_method_stub();
2347 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL),
2348 StubRoutines::throw_AbstractMethodError_entry(),
2349 wrong_method, wrong_method);
2350 }
2351
2352 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint,
2353 address i2c_entry,
2354 address c2i_entry,
2355 address c2i_unverified_entry) {
2356 return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
2357 }
2358
2359 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(methodHandle method) {
2360 // Use customized signature handler. Need to lock around updates to
2361 // the AdapterHandlerTable (it is not safe for concurrent readers
2362 // and a single writer: this could be fixed if it becomes a
2363 // problem).
2364
2365 // Get the address of the ic_miss handlers before we grab the
2366 // AdapterHandlerLibrary_lock. This fixes bug 6236259 which
2367 // was caused by the initialization of the stubs happening
2368 // while we held the lock and then notifying jvmti while
2369 // holding it. This just forces the initialization to be a little
2370 // earlier.
2371 address ic_miss = SharedRuntime::get_ic_miss_stub();
2372 assert(ic_miss != NULL, "must have handler");
2373
2374 ResourceMark rm;
2375
2376 NOT_PRODUCT(int insts_size);
2377 AdapterBlob* B = NULL;
2378 AdapterHandlerEntry* entry = NULL;
2379 AdapterFingerPrint* fingerprint = NULL;
2380 {
2381 MutexLocker mu(AdapterHandlerLibrary_lock);
2382 // make sure data structure is initialized
2383 initialize();
2384
2385 if (method->is_abstract()) {
2386 return _abstract_method_handler;
2387 }
2388
2389 // Fill in the signature array, for the calling-convention call.
2390 int total_args_passed = method->size_of_parameters(); // All args on stack
2391
2392 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2393 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2394 int i = 0;
2395 if (!method->is_static()) // Pass in receiver first
2396 sig_bt[i++] = T_OBJECT;
2397 for (SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) {
2398 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2399 if (ss.type() == T_LONG || ss.type() == T_DOUBLE)
2400 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2401 }
2402 assert(i == total_args_passed, "");
2403
2404 // Lookup method signature's fingerprint
2405 entry = _adapters->lookup(total_args_passed, sig_bt);
2406
2407 #ifdef ASSERT
2408 AdapterHandlerEntry* shared_entry = NULL;
2409 // Start adapter sharing verification only after the VM is booted.
2410 if (VerifyAdapterSharing && (entry != NULL) && entry->contains_all_checks()) {
2411 shared_entry = entry;
2412 entry = NULL;
2413 }
2414 #endif
2415
2416 if (entry != NULL) {
2417 // Re-use generated adapter only if VM is booted (StubRoutines::code2() != NULL
2418 // or VerifyAdapterCalls and VerifyAdapterSharing is false. The reason is that
2419 // gen_i2c_adapter() generates code based on the existence of StubRoutines::code1()
2420 // and StubRoutines::code2(). Since these fields can be initialized after adapters
2421 // are generated, VerifyAdapterCalls potentially reports a false error and/or
2422 // VerifyAdapterSharing will fail.
2423 if (!entry->contains_all_checks()) {
2424 _adapters->free_entry(entry);
2425 } else {
2426 return entry;
2427 }
2428 }
2429
2430 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
2431 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false);
2432
2433 // Make a C heap allocated version of the fingerprint to store in the adapter
2434 fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt);
2435
2436 // Create I2C & C2I handlers
2437
2438 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2439 if (buf != NULL) {
2440 CodeBuffer buffer(buf);
2441 short buffer_locs[20];
2442 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
2443 sizeof(buffer_locs)/sizeof(relocInfo));
2444
2445 bool contains_all_checks = (StubRoutines::code2() != NULL) || !VerifyAdapterCalls;
2446 MacroAssembler _masm(&buffer);
2447 entry = SharedRuntime::generate_i2c2i_adapters(&_masm,
2448 total_args_passed,
2449 comp_args_on_stack,
2450 sig_bt,
2451 regs,
2452 fingerprint);
2453 entry->set_contains_all_checks(contains_all_checks);
2454 #ifdef ASSERT
2455 if (VerifyAdapterSharing) {
2456 if (shared_entry != NULL) {
2457 assert(shared_entry->compare_code(buf->code_begin(), buffer.insts_size()), "code must match");
2458 // Release the one just created and return the original
2459 _adapters->free_entry(entry);
2460 return shared_entry;
2461 } else {
2462 entry->save_code(buf->code_begin(), buffer.insts_size());
2463 }
2464 }
2465 #endif
2466
2467 B = AdapterBlob::create(&buffer);
2468 NOT_PRODUCT(insts_size = buffer.insts_size());
2469 }
2470 if (B == NULL) {
2471 // CodeCache is full, disable compilation
2472 // Ought to log this but compile log is only per compile thread
2473 // and we're some non descript Java thread.
2474 MutexUnlocker mu(AdapterHandlerLibrary_lock);
2475 CompileBroker::handle_full_code_cache();
2476 return NULL; // Out of CodeCache space
2477 }
2478 entry->relocate(B->content_begin());
2479 #ifndef PRODUCT
2480 // debugging suppport
2481 if (PrintAdapterHandlers || PrintStubCode) {
2482 ttyLocker ttyl;
2483 entry->print_adapter_on(tty);
2484 tty->print_cr("i2c argument handler #%d for: %s %s (%d bytes generated)",
2485 _adapters->number_of_entries(), (method->is_static() ? "static" : "receiver"),
2486 method->signature()->as_C_string(), insts_size);
2487 tty->print_cr("c2i argument handler starts at %p",entry->get_c2i_entry());
2488 if (Verbose || PrintStubCode) {
2489 address first_pc = entry->base_address();
2490 if (first_pc != NULL) {
2491 Disassembler::decode(first_pc, first_pc + insts_size);
2492 tty->cr();
2493 }
2494 }
2495 }
2496 #endif
2497
2498 _adapters->add(entry);
2499 }
2500 // Outside of the lock
2501 if (B != NULL) {
2502 char blob_id[256];
2503 jio_snprintf(blob_id,
2504 sizeof(blob_id),
2505 "%s(%s)@" PTR_FORMAT,
2506 B->name(),
2507 fingerprint->as_string(),
2508 B->content_begin());
2509 Forte::register_stub(blob_id, B->content_begin(), B->content_end());
2510
2511 if (JvmtiExport::should_post_dynamic_code_generated()) {
2512 JvmtiExport::post_dynamic_code_generated(blob_id, B->content_begin(), B->content_end());
2513 }
2514 }
2515 return entry;
2516 }
2517
2518 address AdapterHandlerEntry::base_address() {
2519 address base = _i2c_entry;
2520 if (base == NULL) base = _c2i_entry;
2521 assert(base <= _c2i_entry || _c2i_entry == NULL, "");
2522 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == NULL, "");
2523 return base;
2524 }
2525
2526 void AdapterHandlerEntry::relocate(address new_base) {
2527 address old_base = base_address();
2528 assert(old_base != NULL, "");
2529 ptrdiff_t delta = new_base - old_base;
2530 if (_i2c_entry != NULL)
2531 _i2c_entry += delta;
2532 if (_c2i_entry != NULL)
2533 _c2i_entry += delta;
2534 if (_c2i_unverified_entry != NULL)
2535 _c2i_unverified_entry += delta;
2536 assert(base_address() == new_base, "");
2537 }
2538
2539
2540 void AdapterHandlerEntry::deallocate() {
2541 delete _fingerprint;
2542 #ifdef ASSERT
2543 if (_saved_code) FREE_C_HEAP_ARRAY(unsigned char, _saved_code, mtCode);
2544 #endif
2545 }
2546
2547
2548 #ifdef ASSERT
2549 // Capture the code before relocation so that it can be compared
2550 // against other versions. If the code is captured after relocation
2551 // then relative instructions won't be equivalent.
2552 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
2553 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
2554 _saved_code_length = length;
2555 memcpy(_saved_code, buffer, length);
2556 }
2557
2558
2559 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length) {
2560 if (length != _saved_code_length) {
2561 return false;
2562 }
2563
2564 return (memcmp(buffer, _saved_code, length) == 0) ? true : false;
2565 }
2566 #endif
2567
2568
2569 // Create a native wrapper for this native method. The wrapper converts the
2570 // java compiled calling convention to the native convention, handlizes
2571 // arguments, and transitions to native. On return from the native we transition
2572 // back to java blocking if a safepoint is in progress.
2573 nmethod *AdapterHandlerLibrary::create_native_wrapper(methodHandle method, int compile_id) {
2574 ResourceMark rm;
2575 nmethod* nm = NULL;
2576
2577 assert(method->is_native(), "must be native");
2578 assert(method->is_method_handle_intrinsic() ||
2579 method->has_native_function(), "must have something valid to call!");
2580
2581 {
2582 // perform the work while holding the lock, but perform any printing outside the lock
2583 MutexLocker mu(AdapterHandlerLibrary_lock);
2584 // See if somebody beat us to it
2585 nm = method->code();
2586 if (nm) {
2587 return nm;
2588 }
2589
2590 ResourceMark rm;
2591
2592 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2593 if (buf != NULL) {
2594 CodeBuffer buffer(buf);
2595 double locs_buf[20];
2596 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2597 MacroAssembler _masm(&buffer);
2598
2599 // Fill in the signature array, for the calling-convention call.
2600 const int total_args_passed = method->size_of_parameters();
2601
2602 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2603 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2604 int i=0;
2605 if( !method->is_static() ) // Pass in receiver first
2606 sig_bt[i++] = T_OBJECT;
2607 SignatureStream ss(method->signature());
2608 for( ; !ss.at_return_type(); ss.next()) {
2609 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2610 if( ss.type() == T_LONG || ss.type() == T_DOUBLE )
2611 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2612 }
2613 assert(i == total_args_passed, "");
2614 BasicType ret_type = ss.type();
2615
2616 // Now get the compiled-Java layout as input (or output) arguments.
2617 // NOTE: Stubs for compiled entry points of method handle intrinsics
2618 // are just trampolines so the argument registers must be outgoing ones.
2619 const bool is_outgoing = method->is_method_handle_intrinsic();
2620 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, is_outgoing);
2621
2622 // Generate the compiled-to-native wrapper code
2623 nm = SharedRuntime::generate_native_wrapper(&_masm,
2624 method,
2625 compile_id,
2626 sig_bt,
2627 regs,
2628 ret_type);
2629 }
2630 }
2631
2632 // Must unlock before calling set_code
2633
2634 // Install the generated code.
2635 if (nm != NULL) {
2636 if (PrintCompilation) {
2637 ttyLocker ttyl;
2638 CompileTask::print_compilation(tty, nm, method->is_static() ? "(static)" : "");
2639 }
2640 method->set_code(method, nm);
2641 nm->post_compiled_method_load_event();
2642 } else {
2643 // CodeCache is full, disable compilation
2644 CompileBroker::handle_full_code_cache();
2645 }
2646 return nm;
2647 }
2648
2649 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::block_for_jni_critical(JavaThread* thread))
2650 assert(thread == JavaThread::current(), "must be");
2651 // The code is about to enter a JNI lazy critical native method and
2652 // _needs_gc is true, so if this thread is already in a critical
2653 // section then just return, otherwise this thread should block
2654 // until needs_gc has been cleared.
2655 if (thread->in_critical()) {
2656 return;
2657 }
2658 // Lock and unlock a critical section to give the system a chance to block
2659 GC_locker::lock_critical(thread);
2660 GC_locker::unlock_critical(thread);
2661 JRT_END
2662
2663 #ifdef HAVE_DTRACE_H
2664 // Create a dtrace nmethod for this method. The wrapper converts the
2665 // java compiled calling convention to the native convention, makes a dummy call
2666 // (actually nops for the size of the call instruction, which become a trap if
2667 // probe is enabled). The returns to the caller. Since this all looks like a
2668 // leaf no thread transition is needed.
2669
2670 nmethod *AdapterHandlerLibrary::create_dtrace_nmethod(methodHandle method) {
2671 ResourceMark rm;
2672 nmethod* nm = NULL;
2673
2674 if (PrintCompilation) {
2675 ttyLocker ttyl;
2676 tty->print("--- n%s ");
2677 method->print_short_name(tty);
2678 if (method->is_static()) {
2679 tty->print(" (static)");
2680 }
2681 tty->cr();
2682 }
2683
2684 {
2685 // perform the work while holding the lock, but perform any printing
2686 // outside the lock
2687 MutexLocker mu(AdapterHandlerLibrary_lock);
2688 // See if somebody beat us to it
2689 nm = method->code();
2690 if (nm) {
2691 return nm;
2692 }
2693
2694 ResourceMark rm;
2695
2696 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2697 if (buf != NULL) {
2698 CodeBuffer buffer(buf);
2699 // Need a few relocation entries
2700 double locs_buf[20];
2701 buffer.insts()->initialize_shared_locs(
2702 (relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2703 MacroAssembler _masm(&buffer);
2704
2705 // Generate the compiled-to-native wrapper code
2706 nm = SharedRuntime::generate_dtrace_nmethod(&_masm, method);
2707 }
2708 }
2709 return nm;
2710 }
2711
2712 // the dtrace method needs to convert java lang string to utf8 string.
2713 void SharedRuntime::get_utf(oopDesc* src, address dst) {
2714 typeArrayOop jlsValue = java_lang_String::value(src);
2715 int jlsOffset = java_lang_String::offset(src);
2716 int jlsLen = java_lang_String::length(src);
2717 jchar* jlsPos = (jlsLen == 0) ? NULL :
2718 jlsValue->char_at_addr(jlsOffset);
2719 assert(TypeArrayKlass::cast(jlsValue->klass())->element_type() == T_CHAR, "compressed string");
2720 (void) UNICODE::as_utf8(jlsPos, jlsLen, (char *)dst, max_dtrace_string_size);
2721 }
2722 #endif // ndef HAVE_DTRACE_H
2723
2724 // -------------------------------------------------------------------------
2725 // Java-Java calling convention
2726 // (what you use when Java calls Java)
2727
2728 //------------------------------name_for_receiver----------------------------------
2729 // For a given signature, return the VMReg for parameter 0.
2730 VMReg SharedRuntime::name_for_receiver() {
2731 VMRegPair regs;
2732 BasicType sig_bt = T_OBJECT;
2733 (void) java_calling_convention(&sig_bt, ®s, 1, true);
2734 // Return argument 0 register. In the LP64 build pointers
2735 // take 2 registers, but the VM wants only the 'main' name.
2736 return regs.first();
2737 }
2738
2739 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) {
2740 // This method is returning a data structure allocating as a
2741 // ResourceObject, so do not put any ResourceMarks in here.
2742 char *s = sig->as_C_string();
2743 int len = (int)strlen(s);
2744 s++; len--; // Skip opening paren
2745 char *t = s+len;
2746 while( *(--t) != ')' ) ; // Find close paren
2747
2748 BasicType *sig_bt = NEW_RESOURCE_ARRAY( BasicType, 256 );
2749 VMRegPair *regs = NEW_RESOURCE_ARRAY( VMRegPair, 256 );
2750 int cnt = 0;
2751 if (has_receiver) {
2752 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature
2753 }
2754
2755 while( s < t ) {
2756 switch( *s++ ) { // Switch on signature character
2757 case 'B': sig_bt[cnt++] = T_BYTE; break;
2758 case 'C': sig_bt[cnt++] = T_CHAR; break;
2759 case 'D': sig_bt[cnt++] = T_DOUBLE; sig_bt[cnt++] = T_VOID; break;
2760 case 'F': sig_bt[cnt++] = T_FLOAT; break;
2761 case 'I': sig_bt[cnt++] = T_INT; break;
2762 case 'J': sig_bt[cnt++] = T_LONG; sig_bt[cnt++] = T_VOID; break;
2763 case 'S': sig_bt[cnt++] = T_SHORT; break;
2764 case 'Z': sig_bt[cnt++] = T_BOOLEAN; break;
2765 case 'V': sig_bt[cnt++] = T_VOID; break;
2766 case 'L': // Oop
2767 while( *s++ != ';' ) ; // Skip signature
2768 sig_bt[cnt++] = T_OBJECT;
2769 break;
2770 case '[': { // Array
2771 do { // Skip optional size
2772 while( *s >= '0' && *s <= '9' ) s++;
2773 } while( *s++ == '[' ); // Nested arrays?
2774 // Skip element type
2775 if( s[-1] == 'L' )
2776 while( *s++ != ';' ) ; // Skip signature
2777 sig_bt[cnt++] = T_ARRAY;
2778 break;
2779 }
2780 default : ShouldNotReachHere();
2781 }
2782 }
2783
2784 if (has_appendix) {
2785 sig_bt[cnt++] = T_OBJECT;
2786 }
2787
2788 assert( cnt < 256, "grow table size" );
2789
2790 int comp_args_on_stack;
2791 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true);
2792
2793 // the calling convention doesn't count out_preserve_stack_slots so
2794 // we must add that in to get "true" stack offsets.
2795
2796 if (comp_args_on_stack) {
2797 for (int i = 0; i < cnt; i++) {
2798 VMReg reg1 = regs[i].first();
2799 if( reg1->is_stack()) {
2800 // Yuck
2801 reg1 = reg1->bias(out_preserve_stack_slots());
2802 }
2803 VMReg reg2 = regs[i].second();
2804 if( reg2->is_stack()) {
2805 // Yuck
2806 reg2 = reg2->bias(out_preserve_stack_slots());
2807 }
2808 regs[i].set_pair(reg2, reg1);
2809 }
2810 }
2811
2812 // results
2813 *arg_size = cnt;
2814 return regs;
2815 }
2816
2817 // OSR Migration Code
2818 //
2819 // This code is used convert interpreter frames into compiled frames. It is
2820 // called from very start of a compiled OSR nmethod. A temp array is
2821 // allocated to hold the interesting bits of the interpreter frame. All
2822 // active locks are inflated to allow them to move. The displaced headers and
2823 // active interpeter locals are copied into the temp buffer. Then we return
2824 // back to the compiled code. The compiled code then pops the current
2825 // interpreter frame off the stack and pushes a new compiled frame. Then it
2826 // copies the interpreter locals and displaced headers where it wants.
2827 // Finally it calls back to free the temp buffer.
2828 //
2829 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed.
2830
2831 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) )
2832
2833 //
2834 // This code is dependent on the memory layout of the interpreter local
2835 // array and the monitors. On all of our platforms the layout is identical
2836 // so this code is shared. If some platform lays the their arrays out
2837 // differently then this code could move to platform specific code or
2838 // the code here could be modified to copy items one at a time using
2839 // frame accessor methods and be platform independent.
2840
2841 frame fr = thread->last_frame();
2842 assert( fr.is_interpreted_frame(), "" );
2843 assert( fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks" );
2844
2845 // Figure out how many monitors are active.
2846 int active_monitor_count = 0;
2847 for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
2848 kptr < fr.interpreter_frame_monitor_begin();
2849 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
2850 if( kptr->obj() != NULL ) active_monitor_count++;
2851 }
2852
2853 // QQQ we could place number of active monitors in the array so that compiled code
2854 // could double check it.
2855
2856 Method* moop = fr.interpreter_frame_method();
2857 int max_locals = moop->max_locals();
2858 // Allocate temp buffer, 1 word per local & 2 per active monitor
2859 int buf_size_words = max_locals + active_monitor_count*2;
2860 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode);
2861
2862 // Copy the locals. Order is preserved so that loading of longs works.
2863 // Since there's no GC I can copy the oops blindly.
2864 assert( sizeof(HeapWord)==sizeof(intptr_t), "fix this code");
2865 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
2866 (HeapWord*)&buf[0],
2867 max_locals);
2868
2869 // Inflate locks. Copy the displaced headers. Be careful, there can be holes.
2870 int i = max_locals;
2871 for( BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();
2872 kptr2 < fr.interpreter_frame_monitor_begin();
2873 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {
2874 if( kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array
2875 BasicLock *lock = kptr2->lock();
2876 // Inflate so the displaced header becomes position-independent
2877 if (lock->displaced_header()->is_unlocked())
2878 ObjectSynchronizer::inflate_helper(kptr2->obj());
2879 // Now the displaced header is free to move
2880 buf[i++] = (intptr_t)lock->displaced_header();
2881 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj());
2882 }
2883 }
2884 assert( i - max_locals == active_monitor_count*2, "found the expected number of monitors" );
2885
2886 return buf;
2887 JRT_END
2888
2889 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) )
2890 FREE_C_HEAP_ARRAY(intptr_t,buf, mtCode);
2891 JRT_END
2892
2893 bool AdapterHandlerLibrary::contains(CodeBlob* b) {
2894 AdapterHandlerTableIterator iter(_adapters);
2895 while (iter.has_next()) {
2896 AdapterHandlerEntry* a = iter.next();
2897 if ( b == CodeCache::find_blob(a->get_i2c_entry()) ) return true;
2898 }
2899 return false;
2900 }
2901
2902 void AdapterHandlerLibrary::print_handler_on(outputStream* st, CodeBlob* b) {
2903 AdapterHandlerTableIterator iter(_adapters);
2904 while (iter.has_next()) {
2905 AdapterHandlerEntry* a = iter.next();
2906 if (b == CodeCache::find_blob(a->get_i2c_entry())) {
2907 st->print("Adapter for signature: ");
2908 a->print_adapter_on(tty);
2909 return;
2910 }
2911 }
2912 assert(false, "Should have found handler");
2913 }
2914
2915 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
2916 st->print_cr("AHE@" INTPTR_FORMAT ": %s i2c: " INTPTR_FORMAT " c2i: " INTPTR_FORMAT " c2iUV: " INTPTR_FORMAT,
2917 (intptr_t) this, fingerprint()->as_string(),
2918 get_i2c_entry(), get_c2i_entry(), get_c2i_unverified_entry());
2919
2920 }
2921
2922 #ifndef PRODUCT
2923
2924 void AdapterHandlerLibrary::print_statistics() {
2925 _adapters->print_statistics();
2926 }
2927
2928 #endif /* PRODUCT */