1 /*
2 * Copyright (c) 1997, 2014, 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::_wrong_method_abstract_blob;
88 RuntimeStub* SharedRuntime::_ic_miss_blob;
89 RuntimeStub* SharedRuntime::_resolve_opt_virtual_call_blob;
90 RuntimeStub* SharedRuntime::_resolve_virtual_call_blob;
91 RuntimeStub* SharedRuntime::_resolve_static_call_blob;
92
93 DeoptimizationBlob* SharedRuntime::_deopt_blob;
94 SafepointBlob* SharedRuntime::_polling_page_vectors_safepoint_handler_blob;
95 SafepointBlob* SharedRuntime::_polling_page_safepoint_handler_blob;
96 SafepointBlob* SharedRuntime::_polling_page_return_handler_blob;
97
98 #ifdef COMPILER2
99 UncommonTrapBlob* SharedRuntime::_uncommon_trap_blob;
100 #endif // COMPILER2
101
102
103 //----------------------------generate_stubs-----------------------------------
104 void SharedRuntime::generate_stubs() {
105 _wrong_method_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method), "wrong_method_stub");
106 _wrong_method_abstract_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract), "wrong_method_abstract_stub");
107 _ic_miss_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss), "ic_miss_stub");
108 _resolve_opt_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C), "resolve_opt_virtual_call");
109 _resolve_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C), "resolve_virtual_call");
110 _resolve_static_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C), "resolve_static_call");
111
112 #ifdef COMPILER2
113 // Vectors are generated only by C2.
114 if (is_wide_vector(MaxVectorSize)) {
115 _polling_page_vectors_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_VECTOR_LOOP);
116 }
117 #endif // COMPILER2
118 _polling_page_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_LOOP);
119 _polling_page_return_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_RETURN);
120
121 generate_deopt_blob();
122
123 #ifdef COMPILER2
124 generate_uncommon_trap_blob();
125 #endif // COMPILER2
126 }
127
128 #include <math.h>
129
130 // Implementation of SharedRuntime
131
132 #ifndef PRODUCT
133 // For statistics
134 int SharedRuntime::_ic_miss_ctr = 0;
135 int SharedRuntime::_wrong_method_ctr = 0;
136 int SharedRuntime::_resolve_static_ctr = 0;
137 int SharedRuntime::_resolve_virtual_ctr = 0;
138 int SharedRuntime::_resolve_opt_virtual_ctr = 0;
139 int SharedRuntime::_implicit_null_throws = 0;
140 int SharedRuntime::_implicit_div0_throws = 0;
141 int SharedRuntime::_throw_null_ctr = 0;
142
143 int SharedRuntime::_nof_normal_calls = 0;
144 int SharedRuntime::_nof_optimized_calls = 0;
145 int SharedRuntime::_nof_inlined_calls = 0;
146 int SharedRuntime::_nof_megamorphic_calls = 0;
147 int SharedRuntime::_nof_static_calls = 0;
148 int SharedRuntime::_nof_inlined_static_calls = 0;
149 int SharedRuntime::_nof_interface_calls = 0;
150 int SharedRuntime::_nof_optimized_interface_calls = 0;
151 int SharedRuntime::_nof_inlined_interface_calls = 0;
152 int SharedRuntime::_nof_megamorphic_interface_calls = 0;
153 int SharedRuntime::_nof_removable_exceptions = 0;
154
155 int SharedRuntime::_new_instance_ctr=0;
156 int SharedRuntime::_new_array_ctr=0;
157 int SharedRuntime::_multi1_ctr=0;
158 int SharedRuntime::_multi2_ctr=0;
159 int SharedRuntime::_multi3_ctr=0;
160 int SharedRuntime::_multi4_ctr=0;
161 int SharedRuntime::_multi5_ctr=0;
162 int SharedRuntime::_mon_enter_stub_ctr=0;
163 int SharedRuntime::_mon_exit_stub_ctr=0;
164 int SharedRuntime::_mon_enter_ctr=0;
165 int SharedRuntime::_mon_exit_ctr=0;
166 int SharedRuntime::_partial_subtype_ctr=0;
167 int SharedRuntime::_jbyte_array_copy_ctr=0;
168 int SharedRuntime::_jshort_array_copy_ctr=0;
169 int SharedRuntime::_jint_array_copy_ctr=0;
170 int SharedRuntime::_jlong_array_copy_ctr=0;
171 int SharedRuntime::_oop_array_copy_ctr=0;
172 int SharedRuntime::_checkcast_array_copy_ctr=0;
173 int SharedRuntime::_unsafe_array_copy_ctr=0;
174 int SharedRuntime::_generic_array_copy_ctr=0;
175 int SharedRuntime::_slow_array_copy_ctr=0;
176 int SharedRuntime::_find_handler_ctr=0;
177 int SharedRuntime::_rethrow_ctr=0;
178
179 int SharedRuntime::_ICmiss_index = 0;
180 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count];
181 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count];
182
183
184 void SharedRuntime::trace_ic_miss(address at) {
185 for (int i = 0; i < _ICmiss_index; i++) {
186 if (_ICmiss_at[i] == at) {
187 _ICmiss_count[i]++;
188 return;
189 }
190 }
191 int index = _ICmiss_index++;
192 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1;
193 _ICmiss_at[index] = at;
194 _ICmiss_count[index] = 1;
195 }
196
197 void SharedRuntime::print_ic_miss_histogram() {
198 if (ICMissHistogram) {
199 tty->print_cr ("IC Miss Histogram:");
200 int tot_misses = 0;
201 for (int i = 0; i < _ICmiss_index; i++) {
202 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", _ICmiss_at[i], _ICmiss_count[i]);
203 tot_misses += _ICmiss_count[i];
204 }
205 tty->print_cr ("Total IC misses: %7d", tot_misses);
206 }
207 }
208 #endif // PRODUCT
209
210 #if INCLUDE_ALL_GCS
211
212 // G1 write-barrier pre: executed before a pointer store.
213 JRT_LEAF(void, SharedRuntime::g1_wb_pre(oopDesc* orig, JavaThread *thread))
214 if (orig == NULL) {
215 assert(false, "should be optimized out");
216 return;
217 }
218 assert(orig->is_oop(true /* ignore mark word */), "Error");
219 // store the original value that was in the field reference
220 thread->satb_mark_queue().enqueue(orig);
221 JRT_END
222
223 // G1 write-barrier post: executed after a pointer store.
224 JRT_LEAF(void, SharedRuntime::g1_wb_post(void* card_addr, JavaThread* thread))
225 thread->dirty_card_queue().enqueue(card_addr);
226 JRT_END
227
228 #endif // INCLUDE_ALL_GCS
229
230
231 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x))
232 return x * y;
233 JRT_END
234
235
236 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x))
237 if (x == min_jlong && y == CONST64(-1)) {
238 return x;
239 } else {
240 return x / y;
241 }
242 JRT_END
243
244
245 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x))
246 if (x == min_jlong && y == CONST64(-1)) {
247 return 0;
248 } else {
249 return x % y;
250 }
251 JRT_END
252
253
254 const juint float_sign_mask = 0x7FFFFFFF;
255 const juint float_infinity = 0x7F800000;
256 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF);
257 const julong double_infinity = CONST64(0x7FF0000000000000);
258
259 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y))
260 #ifdef _WIN64
261 // 64-bit Windows on amd64 returns the wrong values for
262 // infinity operands.
263 union { jfloat f; juint i; } xbits, ybits;
264 xbits.f = x;
265 ybits.f = y;
266 // x Mod Infinity == x unless x is infinity
267 if ( ((xbits.i & float_sign_mask) != float_infinity) &&
268 ((ybits.i & float_sign_mask) == float_infinity) ) {
269 return x;
270 }
271 #endif
272 return ((jfloat)fmod((double)x,(double)y));
273 JRT_END
274
275
276 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y))
277 #ifdef _WIN64
278 union { jdouble d; julong l; } xbits, ybits;
279 xbits.d = x;
280 ybits.d = y;
281 // x Mod Infinity == x unless x is infinity
282 if ( ((xbits.l & double_sign_mask) != double_infinity) &&
283 ((ybits.l & double_sign_mask) == double_infinity) ) {
284 return x;
285 }
286 #endif
287 return ((jdouble)fmod((double)x,(double)y));
288 JRT_END
289
290 #ifdef __SOFTFP__
291 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y))
292 return x + y;
293 JRT_END
294
295 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y))
296 return x - y;
297 JRT_END
298
299 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y))
300 return x * y;
301 JRT_END
302
303 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y))
304 return x / y;
305 JRT_END
306
307 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y))
308 return x + y;
309 JRT_END
310
311 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y))
312 return x - y;
313 JRT_END
314
315 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y))
316 return x * y;
317 JRT_END
318
319 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y))
320 return x / y;
321 JRT_END
322
323 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x))
324 return (jfloat)x;
325 JRT_END
326
327 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x))
328 return (jdouble)x;
329 JRT_END
330
331 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x))
332 return (jdouble)x;
333 JRT_END
334
335 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y))
336 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/
337 JRT_END
338
339 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y))
340 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
341 JRT_END
342
343 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y))
344 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */
345 JRT_END
346
347 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y))
348 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
349 JRT_END
350
351 // Functions to return the opposite of the aeabi functions for nan.
352 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(float x, float y))
353 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
354 JRT_END
355
356 JRT_LEAF(int, SharedRuntime::unordered_dcmplt(double x, double y))
357 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
358 JRT_END
359
360 JRT_LEAF(int, SharedRuntime::unordered_fcmple(float x, float y))
361 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
362 JRT_END
363
364 JRT_LEAF(int, SharedRuntime::unordered_dcmple(double x, double y))
365 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
366 JRT_END
367
368 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y))
369 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
370 JRT_END
371
372 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y))
373 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
374 JRT_END
375
376 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y))
377 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
378 JRT_END
379
380 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y))
381 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
382 JRT_END
383
384 // Intrinsics make gcc generate code for these.
385 float SharedRuntime::fneg(float f) {
386 return -f;
387 }
388
389 double SharedRuntime::dneg(double f) {
390 return -f;
391 }
392
393 #endif // __SOFTFP__
394
395 #if defined(__SOFTFP__) || defined(E500V2)
396 // Intrinsics make gcc generate code for these.
397 double SharedRuntime::dabs(double f) {
398 return (f <= (double)0.0) ? (double)0.0 - f : f;
399 }
400
401 #endif
402
403 #if defined(__SOFTFP__) || defined(PPC32)
404 double SharedRuntime::dsqrt(double f) {
405 return sqrt(f);
406 }
407 #endif
408
409 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x))
410 if (g_isnan(x))
411 return 0;
412 if (x >= (jfloat) max_jint)
413 return max_jint;
414 if (x <= (jfloat) min_jint)
415 return min_jint;
416 return (jint) x;
417 JRT_END
418
419
420 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x))
421 if (g_isnan(x))
422 return 0;
423 if (x >= (jfloat) max_jlong)
424 return max_jlong;
425 if (x <= (jfloat) min_jlong)
426 return min_jlong;
427 return (jlong) x;
428 JRT_END
429
430
431 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x))
432 if (g_isnan(x))
433 return 0;
434 if (x >= (jdouble) max_jint)
435 return max_jint;
436 if (x <= (jdouble) min_jint)
437 return min_jint;
438 return (jint) x;
439 JRT_END
440
441
442 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x))
443 if (g_isnan(x))
444 return 0;
445 if (x >= (jdouble) max_jlong)
446 return max_jlong;
447 if (x <= (jdouble) min_jlong)
448 return min_jlong;
449 return (jlong) x;
450 JRT_END
451
452
453 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x))
454 return (jfloat)x;
455 JRT_END
456
457
458 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x))
459 return (jfloat)x;
460 JRT_END
461
462
463 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x))
464 return (jdouble)x;
465 JRT_END
466
467 // Exception handling across interpreter/compiler boundaries
468 //
469 // exception_handler_for_return_address(...) returns the continuation address.
470 // The continuation address is the entry point of the exception handler of the
471 // previous frame depending on the return address.
472
473 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* thread, address return_address) {
474 assert(frame::verify_return_pc(return_address), err_msg("must be a return address: " INTPTR_FORMAT, return_address));
475
476 // Reset method handle flag.
477 thread->set_is_method_handle_return(false);
478
479 // The fastest case first
480 CodeBlob* blob = CodeCache::find_blob(return_address);
481 nmethod* nm = (blob != NULL) ? blob->as_nmethod_or_null() : NULL;
482 if (nm != NULL) {
483 // Set flag if return address is a method handle call site.
484 thread->set_is_method_handle_return(nm->is_method_handle_return(return_address));
485 // native nmethods don't have exception handlers
486 assert(!nm->is_native_method(), "no exception handler");
487 assert(nm->header_begin() != nm->exception_begin(), "no exception handler");
488 if (nm->is_deopt_pc(return_address)) {
489 // If we come here because of a stack overflow, the stack may be
490 // unguarded. Reguard the stack otherwise if we return to the
491 // deopt blob and the stack bang causes a stack overflow we
492 // crash.
493 bool guard_pages_enabled = thread->stack_yellow_zone_enabled();
494 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack();
495 assert(guard_pages_enabled, "stack banging in deopt blob may cause crash");
496 return SharedRuntime::deopt_blob()->unpack_with_exception();
497 } else {
498 return nm->exception_begin();
499 }
500 }
501
502 // Entry code
503 if (StubRoutines::returns_to_call_stub(return_address)) {
504 return StubRoutines::catch_exception_entry();
505 }
506 // Interpreted code
507 if (Interpreter::contains(return_address)) {
508 return Interpreter::rethrow_exception_entry();
509 }
510
511 guarantee(blob == NULL || !blob->is_runtime_stub(), "caller should have skipped stub");
512 guarantee(!VtableStubs::contains(return_address), "NULL exceptions in vtables should have been handled already!");
513
514 #ifndef PRODUCT
515 { ResourceMark rm;
516 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", return_address);
517 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here");
518 tty->print_cr("b) other problem");
519 }
520 #endif // PRODUCT
521
522 ShouldNotReachHere();
523 return NULL;
524 }
525
526
527 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* thread, address return_address))
528 return raw_exception_handler_for_return_address(thread, return_address);
529 JRT_END
530
531
532 address SharedRuntime::get_poll_stub(address pc) {
533 address stub;
534 // Look up the code blob
535 CodeBlob *cb = CodeCache::find_blob(pc);
536
537 // Should be an nmethod
538 assert( cb && cb->is_nmethod(), "safepoint polling: pc must refer to an nmethod" );
539
540 // Look up the relocation information
541 assert( ((nmethod*)cb)->is_at_poll_or_poll_return(pc),
542 "safepoint polling: type must be poll" );
543
544 assert( ((NativeInstruction*)pc)->is_safepoint_poll(),
545 "Only polling locations are used for safepoint");
546
547 bool at_poll_return = ((nmethod*)cb)->is_at_poll_return(pc);
548 bool has_wide_vectors = ((nmethod*)cb)->has_wide_vectors();
549 if (at_poll_return) {
550 assert(SharedRuntime::polling_page_return_handler_blob() != NULL,
551 "polling page return stub not created yet");
552 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();
553 } else if (has_wide_vectors) {
554 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != NULL,
555 "polling page vectors safepoint stub not created yet");
556 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point();
557 } else {
558 assert(SharedRuntime::polling_page_safepoint_handler_blob() != NULL,
559 "polling page safepoint stub not created yet");
560 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point();
561 }
562 #ifndef PRODUCT
563 if( TraceSafepoint ) {
564 char buf[256];
565 jio_snprintf(buf, sizeof(buf),
566 "... found polling page %s exception at pc = "
567 INTPTR_FORMAT ", stub =" INTPTR_FORMAT,
568 at_poll_return ? "return" : "loop",
569 (intptr_t)pc, (intptr_t)stub);
570 tty->print_raw_cr(buf);
571 }
572 #endif // PRODUCT
573 return stub;
574 }
575
576
577 oop SharedRuntime::retrieve_receiver( Symbol* sig, frame caller ) {
578 assert(caller.is_interpreted_frame(), "");
579 int args_size = ArgumentSizeComputer(sig).size() + 1;
580 assert(args_size <= caller.interpreter_frame_expression_stack_size(), "receiver must be on interpreter stack");
581 oop result = cast_to_oop(*caller.interpreter_frame_tos_at(args_size - 1));
582 assert(Universe::heap()->is_in(result) && result->is_oop(), "receiver must be an oop");
583 return result;
584 }
585
586
587 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception) {
588 if (JvmtiExport::can_post_on_exceptions()) {
589 vframeStream vfst(thread, true);
590 methodHandle method = methodHandle(thread, vfst.method());
591 address bcp = method()->bcp_from(vfst.bci());
592 JvmtiExport::post_exception_throw(thread, method(), bcp, h_exception());
593 }
594 Exceptions::_throw(thread, __FILE__, __LINE__, h_exception);
595 }
596
597 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message) {
598 Handle h_exception = Exceptions::new_exception(thread, name, message);
599 throw_and_post_jvmti_exception(thread, h_exception);
600 }
601
602 // The interpreter code to call this tracing function is only
603 // called/generated when TraceRedefineClasses has the right bits
604 // set. Since obsolete methods are never compiled, we don't have
605 // to modify the compilers to generate calls to this function.
606 //
607 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry(
608 JavaThread* thread, Method* method))
609 assert(RC_TRACE_IN_RANGE(0x00001000, 0x00002000), "wrong call");
610
611 if (method->is_obsolete()) {
612 // We are calling an obsolete method, but this is not necessarily
613 // an error. Our method could have been redefined just after we
614 // fetched the Method* from the constant pool.
615
616 // RC_TRACE macro has an embedded ResourceMark
617 RC_TRACE_WITH_THREAD(0x00001000, thread,
618 ("calling obsolete method '%s'",
619 method->name_and_sig_as_C_string()));
620 if (RC_TRACE_ENABLED(0x00002000)) {
621 // this option is provided to debug calls to obsolete methods
622 guarantee(false, "faulting at call to an obsolete method.");
623 }
624 }
625 return 0;
626 JRT_END
627
628 // ret_pc points into caller; we are returning caller's exception handler
629 // for given exception
630 address SharedRuntime::compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
631 bool force_unwind, bool top_frame_only) {
632 assert(nm != NULL, "must exist");
633 ResourceMark rm;
634
635 ScopeDesc* sd = nm->scope_desc_at(ret_pc);
636 // determine handler bci, if any
637 EXCEPTION_MARK;
638
639 int handler_bci = -1;
640 int scope_depth = 0;
641 if (!force_unwind) {
642 int bci = sd->bci();
643 bool recursive_exception = false;
644 do {
645 bool skip_scope_increment = false;
646 // exception handler lookup
647 KlassHandle ek (THREAD, exception->klass());
648 methodHandle mh(THREAD, sd->method());
649 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD);
650 if (HAS_PENDING_EXCEPTION) {
651 recursive_exception = true;
652 // We threw an exception while trying to find the exception handler.
653 // Transfer the new exception to the exception handle which will
654 // be set into thread local storage, and do another lookup for an
655 // exception handler for this exception, this time starting at the
656 // BCI of the exception handler which caused the exception to be
657 // thrown (bugs 4307310 and 4546590). Set "exception" reference
658 // argument to ensure that the correct exception is thrown (4870175).
659 exception = Handle(THREAD, PENDING_EXCEPTION);
660 CLEAR_PENDING_EXCEPTION;
661 if (handler_bci >= 0) {
662 bci = handler_bci;
663 handler_bci = -1;
664 skip_scope_increment = true;
665 }
666 }
667 else {
668 recursive_exception = false;
669 }
670 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) {
671 sd = sd->sender();
672 if (sd != NULL) {
673 bci = sd->bci();
674 }
675 ++scope_depth;
676 }
677 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != NULL));
678 }
679
680 // found handling method => lookup exception handler
681 int catch_pco = ret_pc - nm->code_begin();
682
683 ExceptionHandlerTable table(nm);
684 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth);
685 if (t == NULL && (nm->is_compiled_by_c1() || handler_bci != -1)) {
686 // Allow abbreviated catch tables. The idea is to allow a method
687 // to materialize its exceptions without committing to the exact
688 // routing of exceptions. In particular this is needed for adding
689 // a synthetic handler to unlock monitors when inlining
690 // synchronized methods since the unlock path isn't represented in
691 // the bytecodes.
692 t = table.entry_for(catch_pco, -1, 0);
693 }
694
695 #ifdef COMPILER1
696 if (t == NULL && nm->is_compiled_by_c1()) {
697 assert(nm->unwind_handler_begin() != NULL, "");
698 return nm->unwind_handler_begin();
699 }
700 #endif
701
702 if (t == NULL) {
703 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d", ret_pc, handler_bci);
704 tty->print_cr(" Exception:");
705 exception->print();
706 tty->cr();
707 tty->print_cr(" Compiled exception table :");
708 table.print();
709 nm->print_code();
710 guarantee(false, "missing exception handler");
711 return NULL;
712 }
713
714 return nm->code_begin() + t->pco();
715 }
716
717 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* thread))
718 // These errors occur only at call sites
719 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_AbstractMethodError());
720 JRT_END
721
722 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
723 // These errors occur only at call sites
724 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub");
725 JRT_END
726
727 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* thread))
728 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
729 JRT_END
730
731 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* thread))
732 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
733 JRT_END
734
735 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* thread))
736 // This entry point is effectively only used for NullPointerExceptions which occur at inline
737 // cache sites (when the callee activation is not yet set up) so we are at a call site
738 throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
739 JRT_END
740
741 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread))
742 // We avoid using the normal exception construction in this case because
743 // it performs an upcall to Java, and we're already out of stack space.
744 Klass* k = SystemDictionary::StackOverflowError_klass();
745 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK);
746 Handle exception (thread, exception_oop);
747 if (StackTraceInThrowable) {
748 java_lang_Throwable::fill_in_stack_trace(exception);
749 }
750 throw_and_post_jvmti_exception(thread, exception);
751 JRT_END
752
753 address SharedRuntime::continuation_for_implicit_exception(JavaThread* thread,
754 address pc,
755 SharedRuntime::ImplicitExceptionKind exception_kind)
756 {
757 address target_pc = NULL;
758
759 if (Interpreter::contains(pc)) {
760 #ifdef CC_INTERP
761 // C++ interpreter doesn't throw implicit exceptions
762 ShouldNotReachHere();
763 #else
764 switch (exception_kind) {
765 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry();
766 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry();
767 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry();
768 default: ShouldNotReachHere();
769 }
770 #endif // !CC_INTERP
771 } else {
772 switch (exception_kind) {
773 case STACK_OVERFLOW: {
774 // Stack overflow only occurs upon frame setup; the callee is
775 // going to be unwound. Dispatch to a shared runtime stub
776 // which will cause the StackOverflowError to be fabricated
777 // and processed.
778 // For stack overflow in deoptimization blob, cleanup thread.
779 if (thread->deopt_mark() != NULL) {
780 Deoptimization::cleanup_deopt_info(thread, NULL);
781 }
782 Events::log_exception(thread, "StackOverflowError at " INTPTR_FORMAT, pc);
783 return StubRoutines::throw_StackOverflowError_entry();
784 }
785
786 case IMPLICIT_NULL: {
787 if (VtableStubs::contains(pc)) {
788 // We haven't yet entered the callee frame. Fabricate an
789 // exception and begin dispatching it in the caller. Since
790 // the caller was at a call site, it's safe to destroy all
791 // caller-saved registers, as these entry points do.
792 VtableStub* vt_stub = VtableStubs::stub_containing(pc);
793
794 // If vt_stub is NULL, then return NULL to signal handler to report the SEGV error.
795 if (vt_stub == NULL) return NULL;
796
797 if (vt_stub->is_abstract_method_error(pc)) {
798 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs");
799 Events::log_exception(thread, "AbstractMethodError at " INTPTR_FORMAT, pc);
800 return StubRoutines::throw_AbstractMethodError_entry();
801 } else {
802 Events::log_exception(thread, "NullPointerException at vtable entry " INTPTR_FORMAT, pc);
803 return StubRoutines::throw_NullPointerException_at_call_entry();
804 }
805 } else {
806 CodeBlob* cb = CodeCache::find_blob(pc);
807
808 // If code blob is NULL, then return NULL to signal handler to report the SEGV error.
809 if (cb == NULL) return NULL;
810
811 // Exception happened in CodeCache. Must be either:
812 // 1. Inline-cache check in C2I handler blob,
813 // 2. Inline-cache check in nmethod, or
814 // 3. Implicit null exception in nmethod
815
816 if (!cb->is_nmethod()) {
817 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob();
818 if (!is_in_blob) {
819 cb->print();
820 fatal(err_msg("exception happened outside interpreter, nmethods and vtable stubs at pc " INTPTR_FORMAT, pc));
821 }
822 Events::log_exception(thread, "NullPointerException in code blob at " INTPTR_FORMAT, pc);
823 // There is no handler here, so we will simply unwind.
824 return StubRoutines::throw_NullPointerException_at_call_entry();
825 }
826
827 // Otherwise, it's an nmethod. Consult its exception handlers.
828 nmethod* nm = (nmethod*)cb;
829 if (nm->inlinecache_check_contains(pc)) {
830 // exception happened inside inline-cache check code
831 // => the nmethod is not yet active (i.e., the frame
832 // is not set up yet) => use return address pushed by
833 // caller => don't push another return address
834 Events::log_exception(thread, "NullPointerException in IC check " INTPTR_FORMAT, pc);
835 return StubRoutines::throw_NullPointerException_at_call_entry();
836 }
837
838 if (nm->method()->is_method_handle_intrinsic()) {
839 // exception happened inside MH dispatch code, similar to a vtable stub
840 Events::log_exception(thread, "NullPointerException in MH adapter " INTPTR_FORMAT, pc);
841 return StubRoutines::throw_NullPointerException_at_call_entry();
842 }
843
844 #ifndef PRODUCT
845 _implicit_null_throws++;
846 #endif
847 target_pc = nm->continuation_for_implicit_exception(pc);
848 // If there's an unexpected fault, target_pc might be NULL,
849 // in which case we want to fall through into the normal
850 // error handling code.
851 }
852
853 break; // fall through
854 }
855
856
857 case IMPLICIT_DIVIDE_BY_ZERO: {
858 nmethod* nm = CodeCache::find_nmethod(pc);
859 guarantee(nm != NULL, "must have containing nmethod for implicit division-by-zero exceptions");
860 #ifndef PRODUCT
861 _implicit_div0_throws++;
862 #endif
863 target_pc = nm->continuation_for_implicit_exception(pc);
864 // If there's an unexpected fault, target_pc might be NULL,
865 // in which case we want to fall through into the normal
866 // error handling code.
867 break; // fall through
868 }
869
870 default: ShouldNotReachHere();
871 }
872
873 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind");
874
875 // for AbortVMOnException flag
876 NOT_PRODUCT(Exceptions::debug_check_abort("java.lang.NullPointerException"));
877 if (exception_kind == IMPLICIT_NULL) {
878 Events::log_exception(thread, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc);
879 } else {
880 Events::log_exception(thread, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, pc, target_pc);
881 }
882 return target_pc;
883 }
884
885 ShouldNotReachHere();
886 return NULL;
887 }
888
889
890 /**
891 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is
892 * installed in the native function entry of all native Java methods before
893 * they get linked to their actual native methods.
894 *
895 * \note
896 * This method actually never gets called! The reason is because
897 * the interpreter's native entries call NativeLookup::lookup() which
898 * throws the exception when the lookup fails. The exception is then
899 * caught and forwarded on the return from NativeLookup::lookup() call
900 * before the call to the native function. This might change in the future.
901 */
902 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...))
903 {
904 // We return a bad value here to make sure that the exception is
905 // forwarded before we look at the return value.
906 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badJNIHandle);
907 }
908 JNI_END
909
910 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
911 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
912 }
913
914
915 #ifndef PRODUCT
916 JRT_ENTRY(intptr_t, SharedRuntime::trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2))
917 const frame f = thread->last_frame();
918 assert(f.is_interpreted_frame(), "must be an interpreted frame");
919 #ifndef PRODUCT
920 methodHandle mh(THREAD, f.interpreter_frame_method());
921 BytecodeTracer::trace(mh, f.interpreter_frame_bcp(), tos, tos2);
922 #endif // !PRODUCT
923 return preserve_this_value;
924 JRT_END
925 #endif // !PRODUCT
926
927 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
928 assert(obj->is_oop(), "must be a valid oop");
929 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
930 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
931 JRT_END
932
933
934 jlong SharedRuntime::get_java_tid(Thread* thread) {
935 if (thread != NULL) {
936 if (thread->is_Java_thread()) {
937 oop obj = ((JavaThread*)thread)->threadObj();
938 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj);
939 }
940 }
941 return 0;
942 }
943
944 /**
945 * This function ought to be a void function, but cannot be because
946 * it gets turned into a tail-call on sparc, which runs into dtrace bug
947 * 6254741. Once that is fixed we can remove the dummy return value.
948 */
949 int SharedRuntime::dtrace_object_alloc(oopDesc* o) {
950 return dtrace_object_alloc_base(Thread::current(), o);
951 }
952
953 int SharedRuntime::dtrace_object_alloc_base(Thread* thread, oopDesc* o) {
954 assert(DTraceAllocProbes, "wrong call");
955 Klass* klass = o->klass();
956 int size = o->size();
957 Symbol* name = klass->name();
958 HOTSPOT_OBJECT_ALLOC(
959 get_java_tid(thread),
960 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize);
961 return 0;
962 }
963
964 JRT_LEAF(int, SharedRuntime::dtrace_method_entry(
965 JavaThread* thread, Method* method))
966 assert(DTraceMethodProbes, "wrong call");
967 Symbol* kname = method->klass_name();
968 Symbol* name = method->name();
969 Symbol* sig = method->signature();
970 HOTSPOT_METHOD_ENTRY(
971 get_java_tid(thread),
972 (char *) kname->bytes(), kname->utf8_length(),
973 (char *) name->bytes(), name->utf8_length(),
974 (char *) sig->bytes(), sig->utf8_length());
975 return 0;
976 JRT_END
977
978 JRT_LEAF(int, SharedRuntime::dtrace_method_exit(
979 JavaThread* thread, Method* method))
980 assert(DTraceMethodProbes, "wrong call");
981 Symbol* kname = method->klass_name();
982 Symbol* name = method->name();
983 Symbol* sig = method->signature();
984 HOTSPOT_METHOD_RETURN(
985 get_java_tid(thread),
986 (char *) kname->bytes(), kname->utf8_length(),
987 (char *) name->bytes(), name->utf8_length(),
988 (char *) sig->bytes(), sig->utf8_length());
989 return 0;
990 JRT_END
991
992
993 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode)
994 // for a call current in progress, i.e., arguments has been pushed on stack
995 // put callee has not been invoked yet. Used by: resolve virtual/static,
996 // vtable updates, etc. Caller frame must be compiled.
997 Handle SharedRuntime::find_callee_info(JavaThread* thread, Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) {
998 ResourceMark rm(THREAD);
999
1000 // last java frame on stack (which includes native call frames)
1001 vframeStream vfst(thread, true); // Do not skip and javaCalls
1002
1003 return find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(Handle()));
1004 }
1005
1006
1007 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
1008 // for a call current in progress, i.e., arguments has been pushed on stack
1009 // but callee has not been invoked yet. Caller frame must be compiled.
1010 Handle SharedRuntime::find_callee_info_helper(JavaThread* thread,
1011 vframeStream& vfst,
1012 Bytecodes::Code& bc,
1013 CallInfo& callinfo, TRAPS) {
1014 Handle receiver;
1015 Handle nullHandle; //create a handy null handle for exception returns
1016
1017 assert(!vfst.at_end(), "Java frame must exist");
1018
1019 // Find caller and bci from vframe
1020 methodHandle caller(THREAD, vfst.method());
1021 int bci = vfst.bci();
1022
1023 // Find bytecode
1024 Bytecode_invoke bytecode(caller, bci);
1025 bc = bytecode.invoke_code();
1026 int bytecode_index = bytecode.index();
1027
1028 // Find receiver for non-static call
1029 if (bc != Bytecodes::_invokestatic &&
1030 bc != Bytecodes::_invokedynamic &&
1031 bc != Bytecodes::_invokehandle) {
1032 // This register map must be update since we need to find the receiver for
1033 // compiled frames. The receiver might be in a register.
1034 RegisterMap reg_map2(thread);
1035 frame stubFrame = thread->last_frame();
1036 // Caller-frame is a compiled frame
1037 frame callerFrame = stubFrame.sender(®_map2);
1038
1039 methodHandle callee = bytecode.static_target(CHECK_(nullHandle));
1040 if (callee.is_null()) {
1041 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1042 }
1043 // Retrieve from a compiled argument list
1044 receiver = Handle(THREAD, callerFrame.retrieve_receiver(®_map2));
1045
1046 if (receiver.is_null()) {
1047 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1048 }
1049 }
1050
1051 // Resolve method. This is parameterized by bytecode.
1052 constantPoolHandle constants(THREAD, caller->constants());
1053 assert(receiver.is_null() || receiver->is_oop(), "wrong receiver");
1054 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_(nullHandle));
1055
1056 #ifdef ASSERT
1057 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1058 if (bc != Bytecodes::_invokestatic && bc != Bytecodes::_invokedynamic && bc != Bytecodes::_invokehandle) {
1059 assert(receiver.not_null(), "should have thrown exception");
1060 KlassHandle receiver_klass(THREAD, receiver->klass());
1061 Klass* rk = constants->klass_ref_at(bytecode_index, CHECK_(nullHandle));
1062 // klass is already loaded
1063 KlassHandle static_receiver_klass(THREAD, rk);
1064 // Method handle invokes might have been optimized to a direct call
1065 // so don't check for the receiver class.
1066 // FIXME this weakens the assert too much
1067 methodHandle callee = callinfo.selected_method();
1068 assert(receiver_klass->is_subtype_of(static_receiver_klass()) ||
1069 callee->is_method_handle_intrinsic() ||
1070 callee->is_compiled_lambda_form(),
1071 "actual receiver must be subclass of static receiver klass");
1072 if (receiver_klass->oop_is_instance()) {
1073 if (InstanceKlass::cast(receiver_klass())->is_not_initialized()) {
1074 tty->print_cr("ERROR: Klass not yet initialized!!");
1075 receiver_klass()->print();
1076 }
1077 assert(!InstanceKlass::cast(receiver_klass())->is_not_initialized(), "receiver_klass must be initialized");
1078 }
1079 }
1080 #endif
1081
1082 return receiver;
1083 }
1084
1085 methodHandle SharedRuntime::find_callee_method(JavaThread* thread, TRAPS) {
1086 ResourceMark rm(THREAD);
1087 // We need first to check if any Java activations (compiled, interpreted)
1088 // exist on the stack since last JavaCall. If not, we need
1089 // to get the target method from the JavaCall wrapper.
1090 vframeStream vfst(thread, true); // Do not skip any javaCalls
1091 methodHandle callee_method;
1092 if (vfst.at_end()) {
1093 // No Java frames were found on stack since we did the JavaCall.
1094 // Hence the stack can only contain an entry_frame. We need to
1095 // find the target method from the stub frame.
1096 RegisterMap reg_map(thread, false);
1097 frame fr = thread->last_frame();
1098 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1099 fr = fr.sender(®_map);
1100 assert(fr.is_entry_frame(), "must be");
1101 // fr is now pointing to the entry frame.
1102 callee_method = methodHandle(THREAD, fr.entry_frame_call_wrapper()->callee_method());
1103 assert(fr.entry_frame_call_wrapper()->receiver() == NULL || !callee_method->is_static(), "non-null receiver for static call??");
1104 } else {
1105 Bytecodes::Code bc;
1106 CallInfo callinfo;
1107 find_callee_info_helper(thread, vfst, bc, callinfo, CHECK_(methodHandle()));
1108 callee_method = callinfo.selected_method();
1109 }
1110 assert(callee_method()->is_method(), "must be");
1111 return callee_method;
1112 }
1113
1114 // Resolves a call.
1115 methodHandle SharedRuntime::resolve_helper(JavaThread *thread,
1116 bool is_virtual,
1117 bool is_optimized, TRAPS) {
1118 methodHandle callee_method;
1119 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1120 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
1121 int retry_count = 0;
1122 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() &&
1123 callee_method->method_holder() != SystemDictionary::Object_klass()) {
1124 // If has a pending exception then there is no need to re-try to
1125 // resolve this method.
1126 // If the method has been redefined, we need to try again.
1127 // Hack: we have no way to update the vtables of arrays, so don't
1128 // require that java.lang.Object has been updated.
1129
1130 // It is very unlikely that method is redefined more than 100 times
1131 // in the middle of resolve. If it is looping here more than 100 times
1132 // means then there could be a bug here.
1133 guarantee((retry_count++ < 100),
1134 "Could not resolve to latest version of redefined method");
1135 // method is redefined in the middle of resolve so re-try.
1136 callee_method = resolve_sub_helper(thread, is_virtual, is_optimized, THREAD);
1137 }
1138 }
1139 return callee_method;
1140 }
1141
1142 // Resolves a call. The compilers generate code for calls that go here
1143 // and are patched with the real destination of the call.
1144 methodHandle SharedRuntime::resolve_sub_helper(JavaThread *thread,
1145 bool is_virtual,
1146 bool is_optimized, TRAPS) {
1147
1148 ResourceMark rm(thread);
1149 RegisterMap cbl_map(thread, false);
1150 frame caller_frame = thread->last_frame().sender(&cbl_map);
1151
1152 CodeBlob* caller_cb = caller_frame.cb();
1153 guarantee(caller_cb != NULL && caller_cb->is_nmethod(), "must be called from nmethod");
1154 nmethod* caller_nm = caller_cb->as_nmethod_or_null();
1155
1156 // make sure caller is not getting deoptimized
1157 // and removed before we are done with it.
1158 // CLEANUP - with lazy deopt shouldn't need this lock
1159 nmethodLocker caller_lock(caller_nm);
1160
1161 // determine call info & receiver
1162 // note: a) receiver is NULL for static calls
1163 // b) an exception is thrown if receiver is NULL for non-static calls
1164 CallInfo call_info;
1165 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1166 Handle receiver = find_callee_info(thread, invoke_code,
1167 call_info, CHECK_(methodHandle()));
1168 methodHandle callee_method = call_info.selected_method();
1169
1170 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1171 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1172 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1173 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1174
1175 // We do not patch the call site if the caller nmethod has been made non-entrant.
1176 if (!caller_nm->is_in_use()) {
1177 return callee_method;
1178 }
1179
1180 #ifndef PRODUCT
1181 // tracing/debugging/statistics
1182 int *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
1183 (is_virtual) ? (&_resolve_virtual_ctr) :
1184 (&_resolve_static_ctr);
1185 Atomic::inc(addr);
1186
1187 if (TraceCallFixup) {
1188 ResourceMark rm(thread);
1189 tty->print("resolving %s%s (%s) call to",
1190 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
1191 Bytecodes::name(invoke_code));
1192 callee_method->print_short_name(tty);
1193 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT, caller_frame.pc(), callee_method->code());
1194 }
1195 #endif
1196
1197 // JSR 292 key invariant:
1198 // If the resolved method is a MethodHandle invoke target the call
1199 // site must be a MethodHandle call site, because the lambda form might tail-call
1200 // leaving the stack in a state unknown to either caller or callee
1201 // TODO detune for now but we might need it again
1202 // assert(!callee_method->is_compiled_lambda_form() ||
1203 // caller_nm->is_method_handle_return(caller_frame.pc()), "must be MH call site");
1204
1205 // Compute entry points. This might require generation of C2I converter
1206 // frames, so we cannot be holding any locks here. Furthermore, the
1207 // computation of the entry points is independent of patching the call. We
1208 // always return the entry-point, but we only patch the stub if the call has
1209 // not been deoptimized. Return values: For a virtual call this is an
1210 // (cached_oop, destination address) pair. For a static call/optimized
1211 // virtual this is just a destination address.
1212
1213 StaticCallInfo static_call_info;
1214 CompiledICInfo virtual_call_info;
1215
1216 // Make sure the callee nmethod does not get deoptimized and removed before
1217 // we are done patching the code.
1218 nmethod* callee_nm = callee_method->code();
1219 if (callee_nm != NULL && !callee_nm->is_in_use()) {
1220 // Patch call site to C2I adapter if callee nmethod is deoptimized or unloaded.
1221 callee_nm = NULL;
1222 }
1223 nmethodLocker nl_callee(callee_nm);
1224 #ifdef ASSERT
1225 address dest_entry_point = callee_nm == NULL ? 0 : callee_nm->entry_point(); // used below
1226 #endif
1227
1228 if (is_virtual) {
1229 assert(receiver.not_null() || invoke_code == Bytecodes::_invokehandle, "sanity check");
1230 bool static_bound = call_info.resolved_method()->can_be_statically_bound();
1231 KlassHandle h_klass(THREAD, invoke_code == Bytecodes::_invokehandle ? NULL : receiver->klass());
1232 CompiledIC::compute_monomorphic_entry(callee_method, h_klass,
1233 is_optimized, static_bound, virtual_call_info,
1234 CHECK_(methodHandle()));
1235 } else {
1236 // static call
1237 CompiledStaticCall::compute_entry(callee_method, static_call_info);
1238 }
1239
1240 // grab lock, check for deoptimization and potentially patch caller
1241 {
1242 MutexLocker ml_patch(CompiledIC_lock);
1243
1244 // Lock blocks for safepoint during which both nmethods can change state.
1245
1246 // Now that we are ready to patch if the Method* was redefined then
1247 // don't update call site and let the caller retry.
1248 // Don't update call site if caller nmethod has been made non-entrant
1249 // as it is a waste of time.
1250 // Don't update call site if callee nmethod was unloaded or deoptimized.
1251 // Don't update call site if callee nmethod was replaced by an other nmethod
1252 // which may happen when multiply alive nmethod (tiered compilation)
1253 // will be supported.
1254 if (!callee_method->is_old() && caller_nm->is_in_use() &&
1255 (callee_nm == NULL || callee_nm->is_in_use() && (callee_method->code() == callee_nm))) {
1256 #ifdef ASSERT
1257 // We must not try to patch to jump to an already unloaded method.
1258 if (dest_entry_point != 0) {
1259 CodeBlob* cb = CodeCache::find_blob(dest_entry_point);
1260 assert((cb != NULL) && cb->is_nmethod() && (((nmethod*)cb) == callee_nm),
1261 "should not call unloaded nmethod");
1262 }
1263 #endif
1264 if (is_virtual) {
1265 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1266 if (inline_cache->is_clean()) {
1267 inline_cache->set_to_monomorphic(virtual_call_info);
1268 }
1269 } else {
1270 CompiledStaticCall* ssc = compiledStaticCall_before(caller_frame.pc());
1271 if (ssc->is_clean()) ssc->set(static_call_info);
1272 }
1273 }
1274
1275 } // unlock CompiledIC_lock
1276
1277 return callee_method;
1278 }
1279
1280
1281 // Inline caches exist only in compiled code
1282 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* thread))
1283 #ifdef ASSERT
1284 RegisterMap reg_map(thread, false);
1285 frame stub_frame = thread->last_frame();
1286 assert(stub_frame.is_runtime_frame(), "sanity check");
1287 frame caller_frame = stub_frame.sender(®_map);
1288 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame(), "unexpected frame");
1289 #endif /* ASSERT */
1290
1291 methodHandle callee_method;
1292 JRT_BLOCK
1293 callee_method = SharedRuntime::handle_ic_miss_helper(thread, CHECK_NULL);
1294 // Return Method* through TLS
1295 thread->set_vm_result_2(callee_method());
1296 JRT_BLOCK_END
1297 // return compiled code entry point after potential safepoints
1298 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1299 return callee_method->verified_code_entry();
1300 JRT_END
1301
1302
1303 // Handle call site that has been made non-entrant
1304 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* thread))
1305 // 6243940 We might end up in here if the callee is deoptimized
1306 // as we race to call it. We don't want to take a safepoint if
1307 // the caller was interpreted because the caller frame will look
1308 // interpreted to the stack walkers and arguments are now
1309 // "compiled" so it is much better to make this transition
1310 // invisible to the stack walking code. The i2c path will
1311 // place the callee method in the callee_target. It is stashed
1312 // there because if we try and find the callee by normal means a
1313 // safepoint is possible and have trouble gc'ing the compiled args.
1314 RegisterMap reg_map(thread, false);
1315 frame stub_frame = thread->last_frame();
1316 assert(stub_frame.is_runtime_frame(), "sanity check");
1317 frame caller_frame = stub_frame.sender(®_map);
1318
1319 if (caller_frame.is_interpreted_frame() ||
1320 caller_frame.is_entry_frame()) {
1321 Method* callee = thread->callee_target();
1322 guarantee(callee != NULL && callee->is_method(), "bad handshake");
1323 thread->set_vm_result_2(callee);
1324 thread->set_callee_target(NULL);
1325 return callee->get_c2i_entry();
1326 }
1327
1328 // Must be compiled to compiled path which is safe to stackwalk
1329 methodHandle callee_method;
1330 JRT_BLOCK
1331 // Force resolving of caller (if we called from compiled frame)
1332 callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_NULL);
1333 thread->set_vm_result_2(callee_method());
1334 JRT_BLOCK_END
1335 // return compiled code entry point after potential safepoints
1336 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1337 return callee_method->verified_code_entry();
1338 JRT_END
1339
1340 // Handle abstract method call
1341 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* thread))
1342 return StubRoutines::throw_AbstractMethodError_entry();
1343 JRT_END
1344
1345
1346 // resolve a static call and patch code
1347 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread *thread ))
1348 methodHandle callee_method;
1349 JRT_BLOCK
1350 callee_method = SharedRuntime::resolve_helper(thread, false, false, CHECK_NULL);
1351 thread->set_vm_result_2(callee_method());
1352 JRT_BLOCK_END
1353 // return compiled code entry point after potential safepoints
1354 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1355 return callee_method->verified_code_entry();
1356 JRT_END
1357
1358
1359 // resolve virtual call and update inline cache to monomorphic
1360 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread *thread ))
1361 methodHandle callee_method;
1362 JRT_BLOCK
1363 callee_method = SharedRuntime::resolve_helper(thread, true, false, CHECK_NULL);
1364 thread->set_vm_result_2(callee_method());
1365 JRT_BLOCK_END
1366 // return compiled code entry point after potential safepoints
1367 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1368 return callee_method->verified_code_entry();
1369 JRT_END
1370
1371
1372 // Resolve a virtual call that can be statically bound (e.g., always
1373 // monomorphic, so it has no inline cache). Patch code to resolved target.
1374 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread *thread))
1375 methodHandle callee_method;
1376 JRT_BLOCK
1377 callee_method = SharedRuntime::resolve_helper(thread, true, true, CHECK_NULL);
1378 thread->set_vm_result_2(callee_method());
1379 JRT_BLOCK_END
1380 // return compiled code entry point after potential safepoints
1381 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1382 return callee_method->verified_code_entry();
1383 JRT_END
1384
1385
1386
1387
1388
1389 methodHandle SharedRuntime::handle_ic_miss_helper(JavaThread *thread, TRAPS) {
1390 ResourceMark rm(thread);
1391 CallInfo call_info;
1392 Bytecodes::Code bc;
1393
1394 // receiver is NULL for static calls. An exception is thrown for NULL
1395 // receivers for non-static calls
1396 Handle receiver = find_callee_info(thread, bc, call_info,
1397 CHECK_(methodHandle()));
1398 // Compiler1 can produce virtual call sites that can actually be statically bound
1399 // If we fell thru to below we would think that the site was going megamorphic
1400 // when in fact the site can never miss. Worse because we'd think it was megamorphic
1401 // we'd try and do a vtable dispatch however methods that can be statically bound
1402 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a
1403 // reresolution of the call site (as if we did a handle_wrong_method and not an
1404 // plain ic_miss) and the site will be converted to an optimized virtual call site
1405 // never to miss again. I don't believe C2 will produce code like this but if it
1406 // did this would still be the correct thing to do for it too, hence no ifdef.
1407 //
1408 if (call_info.resolved_method()->can_be_statically_bound()) {
1409 methodHandle callee_method = SharedRuntime::reresolve_call_site(thread, CHECK_(methodHandle()));
1410 if (TraceCallFixup) {
1411 RegisterMap reg_map(thread, false);
1412 frame caller_frame = thread->last_frame().sender(®_map);
1413 ResourceMark rm(thread);
1414 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc));
1415 callee_method->print_short_name(tty);
1416 tty->print_cr(" from pc: " INTPTR_FORMAT, caller_frame.pc());
1417 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1418 }
1419 return callee_method;
1420 }
1421
1422 methodHandle callee_method = call_info.selected_method();
1423
1424 bool should_be_mono = false;
1425
1426 #ifndef PRODUCT
1427 Atomic::inc(&_ic_miss_ctr);
1428
1429 // Statistics & Tracing
1430 if (TraceCallFixup) {
1431 ResourceMark rm(thread);
1432 tty->print("IC miss (%s) call to", Bytecodes::name(bc));
1433 callee_method->print_short_name(tty);
1434 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1435 }
1436
1437 if (ICMissHistogram) {
1438 MutexLocker m(VMStatistic_lock);
1439 RegisterMap reg_map(thread, false);
1440 frame f = thread->last_frame().real_sender(®_map);// skip runtime stub
1441 // produce statistics under the lock
1442 trace_ic_miss(f.pc());
1443 }
1444 #endif
1445
1446 // install an event collector so that when a vtable stub is created the
1447 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1448 // event can't be posted when the stub is created as locks are held
1449 // - instead the event will be deferred until the event collector goes
1450 // out of scope.
1451 JvmtiDynamicCodeEventCollector event_collector;
1452
1453 // Update inline cache to megamorphic. Skip update if caller has been
1454 // made non-entrant or we are called from interpreted.
1455 { MutexLocker ml_patch (CompiledIC_lock);
1456 RegisterMap reg_map(thread, false);
1457 frame caller_frame = thread->last_frame().sender(®_map);
1458 CodeBlob* cb = caller_frame.cb();
1459 if (cb->is_nmethod() && ((nmethod*)cb)->is_in_use()) {
1460 // Not a non-entrant nmethod, so find inline_cache
1461 CompiledIC* inline_cache = CompiledIC_before(((nmethod*)cb), caller_frame.pc());
1462 bool should_be_mono = false;
1463 if (inline_cache->is_optimized()) {
1464 if (TraceCallFixup) {
1465 ResourceMark rm(thread);
1466 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc));
1467 callee_method->print_short_name(tty);
1468 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1469 }
1470 should_be_mono = true;
1471 } else if (inline_cache->is_icholder_call()) {
1472 CompiledICHolder* ic_oop = inline_cache->cached_icholder();
1473 if ( ic_oop != NULL) {
1474
1475 if (receiver()->klass() == ic_oop->holder_klass()) {
1476 // This isn't a real miss. We must have seen that compiled code
1477 // is now available and we want the call site converted to a
1478 // monomorphic compiled call site.
1479 // We can't assert for callee_method->code() != NULL because it
1480 // could have been deoptimized in the meantime
1481 if (TraceCallFixup) {
1482 ResourceMark rm(thread);
1483 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc));
1484 callee_method->print_short_name(tty);
1485 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1486 }
1487 should_be_mono = true;
1488 }
1489 }
1490 }
1491
1492 if (should_be_mono) {
1493
1494 // We have a path that was monomorphic but was going interpreted
1495 // and now we have (or had) a compiled entry. We correct the IC
1496 // by using a new icBuffer.
1497 CompiledICInfo info;
1498 KlassHandle receiver_klass(THREAD, receiver()->klass());
1499 inline_cache->compute_monomorphic_entry(callee_method,
1500 receiver_klass,
1501 inline_cache->is_optimized(),
1502 false,
1503 info, CHECK_(methodHandle()));
1504 inline_cache->set_to_monomorphic(info);
1505 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) {
1506 // Potential change to megamorphic
1507 bool successful = inline_cache->set_to_megamorphic(&call_info, bc, CHECK_(methodHandle()));
1508 if (!successful) {
1509 inline_cache->set_to_clean();
1510 }
1511 } else {
1512 // Either clean or megamorphic
1513 }
1514 }
1515 } // Release CompiledIC_lock
1516
1517 return callee_method;
1518 }
1519
1520 //
1521 // Resets a call-site in compiled code so it will get resolved again.
1522 // This routines handles both virtual call sites, optimized virtual call
1523 // sites, and static call sites. Typically used to change a call sites
1524 // destination from compiled to interpreted.
1525 //
1526 methodHandle SharedRuntime::reresolve_call_site(JavaThread *thread, TRAPS) {
1527 ResourceMark rm(thread);
1528 RegisterMap reg_map(thread, false);
1529 frame stub_frame = thread->last_frame();
1530 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1531 frame caller = stub_frame.sender(®_map);
1532
1533 // Do nothing if the frame isn't a live compiled frame.
1534 // nmethod could be deoptimized by the time we get here
1535 // so no update to the caller is needed.
1536
1537 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) {
1538
1539 address pc = caller.pc();
1540
1541 // Default call_addr is the location of the "basic" call.
1542 // Determine the address of the call we a reresolving. With
1543 // Inline Caches we will always find a recognizable call.
1544 // With Inline Caches disabled we may or may not find a
1545 // recognizable call. We will always find a call for static
1546 // calls and for optimized virtual calls. For vanilla virtual
1547 // calls it depends on the state of the UseInlineCaches switch.
1548 //
1549 // With Inline Caches disabled we can get here for a virtual call
1550 // for two reasons:
1551 // 1 - calling an abstract method. The vtable for abstract methods
1552 // will run us thru handle_wrong_method and we will eventually
1553 // end up in the interpreter to throw the ame.
1554 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1555 // call and between the time we fetch the entry address and
1556 // we jump to it the target gets deoptimized. Similar to 1
1557 // we will wind up in the interprter (thru a c2i with c2).
1558 //
1559 address call_addr = NULL;
1560 {
1561 // Get call instruction under lock because another thread may be
1562 // busy patching it.
1563 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1564 // Location of call instruction
1565 if (NativeCall::is_call_before(pc)) {
1566 NativeCall *ncall = nativeCall_before(pc);
1567 call_addr = ncall->instruction_address();
1568 }
1569 }
1570
1571 // Check for static or virtual call
1572 bool is_static_call = false;
1573 nmethod* caller_nm = CodeCache::find_nmethod(pc);
1574 // Make sure nmethod doesn't get deoptimized and removed until
1575 // this is done with it.
1576 // CLEANUP - with lazy deopt shouldn't need this lock
1577 nmethodLocker nmlock(caller_nm);
1578
1579 if (call_addr != NULL) {
1580 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1581 int ret = iter.next(); // Get item
1582 if (ret) {
1583 assert(iter.addr() == call_addr, "must find call");
1584 if (iter.type() == relocInfo::static_call_type) {
1585 is_static_call = true;
1586 } else {
1587 assert(iter.type() == relocInfo::virtual_call_type ||
1588 iter.type() == relocInfo::opt_virtual_call_type
1589 , "unexpected relocInfo. type");
1590 }
1591 } else {
1592 assert(!UseInlineCaches, "relocation info. must exist for this address");
1593 }
1594
1595 // Cleaning the inline cache will force a new resolve. This is more robust
1596 // than directly setting it to the new destination, since resolving of calls
1597 // is always done through the same code path. (experience shows that it
1598 // leads to very hard to track down bugs, if an inline cache gets updated
1599 // to a wrong method). It should not be performance critical, since the
1600 // resolve is only done once.
1601
1602 MutexLocker ml(CompiledIC_lock);
1603 //
1604 // We do not patch the call site if the nmethod has been made non-entrant
1605 // as it is a waste of time
1606 //
1607 if (caller_nm->is_in_use()) {
1608 if (is_static_call) {
1609 CompiledStaticCall* ssc= compiledStaticCall_at(call_addr);
1610 ssc->set_to_clean();
1611 } else {
1612 // compiled, dispatched call (which used to call an interpreted method)
1613 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1614 inline_cache->set_to_clean();
1615 }
1616 }
1617 }
1618
1619 }
1620
1621 methodHandle callee_method = find_callee_method(thread, CHECK_(methodHandle()));
1622
1623
1624 #ifndef PRODUCT
1625 Atomic::inc(&_wrong_method_ctr);
1626
1627 if (TraceCallFixup) {
1628 ResourceMark rm(thread);
1629 tty->print("handle_wrong_method reresolving call to");
1630 callee_method->print_short_name(tty);
1631 tty->print_cr(" code: " INTPTR_FORMAT, callee_method->code());
1632 }
1633 #endif
1634
1635 return callee_method;
1636 }
1637
1638 #ifdef ASSERT
1639 void SharedRuntime::check_member_name_argument_is_last_argument(methodHandle method,
1640 const BasicType* sig_bt,
1641 const VMRegPair* regs) {
1642 ResourceMark rm;
1643 const int total_args_passed = method->size_of_parameters();
1644 const VMRegPair* regs_with_member_name = regs;
1645 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1);
1646
1647 const int member_arg_pos = total_args_passed - 1;
1648 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob");
1649 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object");
1650
1651 const bool is_outgoing = method->is_method_handle_intrinsic();
1652 int comp_args_on_stack = java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1, is_outgoing);
1653
1654 for (int i = 0; i < member_arg_pos; i++) {
1655 VMReg a = regs_with_member_name[i].first();
1656 VMReg b = regs_without_member_name[i].first();
1657 assert(a->value() == b->value(), err_msg_res("register allocation mismatch: a=%d, b=%d", a->value(), b->value()));
1658 }
1659 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg");
1660 }
1661 #endif
1662
1663 // ---------------------------------------------------------------------------
1664 // We are calling the interpreter via a c2i. Normally this would mean that
1665 // we were called by a compiled method. However we could have lost a race
1666 // where we went int -> i2c -> c2i and so the caller could in fact be
1667 // interpreted. If the caller is compiled we attempt to patch the caller
1668 // so he no longer calls into the interpreter.
1669 IRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc))
1670 Method* moop(method);
1671
1672 address entry_point = moop->from_compiled_entry();
1673
1674 // It's possible that deoptimization can occur at a call site which hasn't
1675 // been resolved yet, in which case this function will be called from
1676 // an nmethod that has been patched for deopt and we can ignore the
1677 // request for a fixup.
1678 // Also it is possible that we lost a race in that from_compiled_entry
1679 // is now back to the i2c in that case we don't need to patch and if
1680 // we did we'd leap into space because the callsite needs to use
1681 // "to interpreter" stub in order to load up the Method*. Don't
1682 // ask me how I know this...
1683
1684 CodeBlob* cb = CodeCache::find_blob(caller_pc);
1685 if (!cb->is_nmethod() || entry_point == moop->get_c2i_entry()) {
1686 return;
1687 }
1688
1689 // The check above makes sure this is a nmethod.
1690 nmethod* nm = cb->as_nmethod_or_null();
1691 assert(nm, "must be");
1692
1693 // Get the return PC for the passed caller PC.
1694 address return_pc = caller_pc + frame::pc_return_offset;
1695
1696 // There is a benign race here. We could be attempting to patch to a compiled
1697 // entry point at the same time the callee is being deoptimized. If that is
1698 // the case then entry_point may in fact point to a c2i and we'd patch the
1699 // call site with the same old data. clear_code will set code() to NULL
1700 // at the end of it. If we happen to see that NULL then we can skip trying
1701 // to patch. If we hit the window where the callee has a c2i in the
1702 // from_compiled_entry and the NULL isn't present yet then we lose the race
1703 // and patch the code with the same old data. Asi es la vida.
1704
1705 if (moop->code() == NULL) return;
1706
1707 if (nm->is_in_use()) {
1708
1709 // Expect to find a native call there (unless it was no-inline cache vtable dispatch)
1710 MutexLockerEx ml_patch(Patching_lock, Mutex::_no_safepoint_check_flag);
1711 if (NativeCall::is_call_before(return_pc)) {
1712 NativeCall *call = nativeCall_before(return_pc);
1713 //
1714 // bug 6281185. We might get here after resolving a call site to a vanilla
1715 // virtual call. Because the resolvee uses the verified entry it may then
1716 // see compiled code and attempt to patch the site by calling us. This would
1717 // then incorrectly convert the call site to optimized and its downhill from
1718 // there. If you're lucky you'll get the assert in the bugid, if not you've
1719 // just made a call site that could be megamorphic into a monomorphic site
1720 // for the rest of its life! Just another racing bug in the life of
1721 // fixup_callers_callsite ...
1722 //
1723 RelocIterator iter(nm, call->instruction_address(), call->next_instruction_address());
1724 iter.next();
1725 assert(iter.has_current(), "must have a reloc at java call site");
1726 relocInfo::relocType typ = iter.reloc()->type();
1727 if ( typ != relocInfo::static_call_type &&
1728 typ != relocInfo::opt_virtual_call_type &&
1729 typ != relocInfo::static_stub_type) {
1730 return;
1731 }
1732 address destination = call->destination();
1733 if (destination != entry_point) {
1734 CodeBlob* callee = CodeCache::find_blob(destination);
1735 // callee == cb seems weird. It means calling interpreter thru stub.
1736 if (callee == cb || callee->is_adapter_blob()) {
1737 // static call or optimized virtual
1738 if (TraceCallFixup) {
1739 tty->print("fixup callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);
1740 moop->print_short_name(tty);
1741 tty->print_cr(" to " INTPTR_FORMAT, entry_point);
1742 }
1743 call->set_destination_mt_safe(entry_point);
1744 } else {
1745 if (TraceCallFixup) {
1746 tty->print("failed to fixup callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);
1747 moop->print_short_name(tty);
1748 tty->print_cr(" to " INTPTR_FORMAT, entry_point);
1749 }
1750 // assert is too strong could also be resolve destinations.
1751 // assert(InlineCacheBuffer::contains(destination) || VtableStubs::contains(destination), "must be");
1752 }
1753 } else {
1754 if (TraceCallFixup) {
1755 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", caller_pc);
1756 moop->print_short_name(tty);
1757 tty->print_cr(" to " INTPTR_FORMAT, entry_point);
1758 }
1759 }
1760 }
1761 }
1762 IRT_END
1763
1764
1765 // same as JVM_Arraycopy, but called directly from compiled code
1766 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos,
1767 oopDesc* dest, jint dest_pos,
1768 jint length,
1769 JavaThread* thread)) {
1770 #ifndef PRODUCT
1771 _slow_array_copy_ctr++;
1772 #endif
1773 // Check if we have null pointers
1774 if (src == NULL || dest == NULL) {
1775 THROW(vmSymbols::java_lang_NullPointerException());
1776 }
1777 // Do the copy. The casts to arrayOop are necessary to the copy_array API,
1778 // even though the copy_array API also performs dynamic checks to ensure
1779 // that src and dest are truly arrays (and are conformable).
1780 // The copy_array mechanism is awkward and could be removed, but
1781 // the compilers don't call this function except as a last resort,
1782 // so it probably doesn't matter.
1783 src->klass()->copy_array((arrayOopDesc*)src, src_pos,
1784 (arrayOopDesc*)dest, dest_pos,
1785 length, thread);
1786 }
1787 JRT_END
1788
1789 char* SharedRuntime::generate_class_cast_message(
1790 JavaThread* thread, const char* objName) {
1791
1792 // Get target class name from the checkcast instruction
1793 vframeStream vfst(thread, true);
1794 assert(!vfst.at_end(), "Java frame must exist");
1795 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci()));
1796 Klass* targetKlass = vfst.method()->constants()->klass_at(
1797 cc.index(), thread);
1798 return generate_class_cast_message(objName, targetKlass->external_name());
1799 }
1800
1801 char* SharedRuntime::generate_class_cast_message(
1802 const char* objName, const char* targetKlassName, const char* desc) {
1803 size_t msglen = strlen(objName) + strlen(desc) + strlen(targetKlassName) + 1;
1804
1805 char* message = NEW_RESOURCE_ARRAY(char, msglen);
1806 if (NULL == message) {
1807 // Shouldn't happen, but don't cause even more problems if it does
1808 message = const_cast<char*>(objName);
1809 } else {
1810 jio_snprintf(message, msglen, "%s%s%s", objName, desc, targetKlassName);
1811 }
1812 return message;
1813 }
1814
1815 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
1816 (void) JavaThread::current()->reguard_stack();
1817 JRT_END
1818
1819
1820 // Handles the uncommon case in locking, i.e., contention or an inflated lock.
1821 #ifndef PRODUCT
1822 int SharedRuntime::_monitor_enter_ctr=0;
1823 #endif
1824 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::complete_monitor_locking_C(oopDesc* _obj, BasicLock* lock, JavaThread* thread))
1825 oop obj(_obj);
1826 #ifndef PRODUCT
1827 _monitor_enter_ctr++; // monitor enter slow
1828 #endif
1829 if (PrintBiasedLockingStatistics) {
1830 Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
1831 }
1832 Handle h_obj(THREAD, obj);
1833 if (UseBiasedLocking) {
1834 // Retry fast entry if bias is revoked to avoid unnecessary inflation
1835 ObjectSynchronizer::fast_enter(h_obj, lock, true, CHECK);
1836 } else {
1837 ObjectSynchronizer::slow_enter(h_obj, lock, CHECK);
1838 }
1839 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
1840 JRT_END
1841
1842 #ifndef PRODUCT
1843 int SharedRuntime::_monitor_exit_ctr=0;
1844 #endif
1845 // Handles the uncommon cases of monitor unlocking in compiled code
1846 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* _obj, BasicLock* lock))
1847 oop obj(_obj);
1848 #ifndef PRODUCT
1849 _monitor_exit_ctr++; // monitor exit slow
1850 #endif
1851 Thread* THREAD = JavaThread::current();
1852 // I'm not convinced we need the code contained by MIGHT_HAVE_PENDING anymore
1853 // testing was unable to ever fire the assert that guarded it so I have removed it.
1854 assert(!HAS_PENDING_EXCEPTION, "Do we need code below anymore?");
1855 #undef MIGHT_HAVE_PENDING
1856 #ifdef MIGHT_HAVE_PENDING
1857 // Save and restore any pending_exception around the exception mark.
1858 // While the slow_exit must not throw an exception, we could come into
1859 // this routine with one set.
1860 oop pending_excep = NULL;
1861 const char* pending_file;
1862 int pending_line;
1863 if (HAS_PENDING_EXCEPTION) {
1864 pending_excep = PENDING_EXCEPTION;
1865 pending_file = THREAD->exception_file();
1866 pending_line = THREAD->exception_line();
1867 CLEAR_PENDING_EXCEPTION;
1868 }
1869 #endif /* MIGHT_HAVE_PENDING */
1870
1871 {
1872 // Exit must be non-blocking, and therefore no exceptions can be thrown.
1873 EXCEPTION_MARK;
1874 ObjectSynchronizer::slow_exit(obj, lock, THREAD);
1875 }
1876
1877 #ifdef MIGHT_HAVE_PENDING
1878 if (pending_excep != NULL) {
1879 THREAD->set_pending_exception(pending_excep, pending_file, pending_line);
1880 }
1881 #endif /* MIGHT_HAVE_PENDING */
1882 JRT_END
1883
1884 #ifndef PRODUCT
1885
1886 void SharedRuntime::print_statistics() {
1887 ttyLocker ttyl;
1888 if (xtty != NULL) xtty->head("statistics type='SharedRuntime'");
1889
1890 if (_monitor_enter_ctr ) tty->print_cr("%5d monitor enter slow", _monitor_enter_ctr);
1891 if (_monitor_exit_ctr ) tty->print_cr("%5d monitor exit slow", _monitor_exit_ctr);
1892 if (_throw_null_ctr) tty->print_cr("%5d implicit null throw", _throw_null_ctr);
1893
1894 SharedRuntime::print_ic_miss_histogram();
1895
1896 if (CountRemovableExceptions) {
1897 if (_nof_removable_exceptions > 0) {
1898 Unimplemented(); // this counter is not yet incremented
1899 tty->print_cr("Removable exceptions: %d", _nof_removable_exceptions);
1900 }
1901 }
1902
1903 // Dump the JRT_ENTRY counters
1904 if( _new_instance_ctr ) tty->print_cr("%5d new instance requires GC", _new_instance_ctr);
1905 if( _new_array_ctr ) tty->print_cr("%5d new array requires GC", _new_array_ctr);
1906 if( _multi1_ctr ) tty->print_cr("%5d multianewarray 1 dim", _multi1_ctr);
1907 if( _multi2_ctr ) tty->print_cr("%5d multianewarray 2 dim", _multi2_ctr);
1908 if( _multi3_ctr ) tty->print_cr("%5d multianewarray 3 dim", _multi3_ctr);
1909 if( _multi4_ctr ) tty->print_cr("%5d multianewarray 4 dim", _multi4_ctr);
1910 if( _multi5_ctr ) tty->print_cr("%5d multianewarray 5 dim", _multi5_ctr);
1911
1912 tty->print_cr("%5d inline cache miss in compiled", _ic_miss_ctr );
1913 tty->print_cr("%5d wrong method", _wrong_method_ctr );
1914 tty->print_cr("%5d unresolved static call site", _resolve_static_ctr );
1915 tty->print_cr("%5d unresolved virtual call site", _resolve_virtual_ctr );
1916 tty->print_cr("%5d unresolved opt virtual call site", _resolve_opt_virtual_ctr );
1917
1918 if( _mon_enter_stub_ctr ) tty->print_cr("%5d monitor enter stub", _mon_enter_stub_ctr );
1919 if( _mon_exit_stub_ctr ) tty->print_cr("%5d monitor exit stub", _mon_exit_stub_ctr );
1920 if( _mon_enter_ctr ) tty->print_cr("%5d monitor enter slow", _mon_enter_ctr );
1921 if( _mon_exit_ctr ) tty->print_cr("%5d monitor exit slow", _mon_exit_ctr );
1922 if( _partial_subtype_ctr) tty->print_cr("%5d slow partial subtype", _partial_subtype_ctr );
1923 if( _jbyte_array_copy_ctr ) tty->print_cr("%5d byte array copies", _jbyte_array_copy_ctr );
1924 if( _jshort_array_copy_ctr ) tty->print_cr("%5d short array copies", _jshort_array_copy_ctr );
1925 if( _jint_array_copy_ctr ) tty->print_cr("%5d int array copies", _jint_array_copy_ctr );
1926 if( _jlong_array_copy_ctr ) tty->print_cr("%5d long array copies", _jlong_array_copy_ctr );
1927 if( _oop_array_copy_ctr ) tty->print_cr("%5d oop array copies", _oop_array_copy_ctr );
1928 if( _checkcast_array_copy_ctr ) tty->print_cr("%5d checkcast array copies", _checkcast_array_copy_ctr );
1929 if( _unsafe_array_copy_ctr ) tty->print_cr("%5d unsafe array copies", _unsafe_array_copy_ctr );
1930 if( _generic_array_copy_ctr ) tty->print_cr("%5d generic array copies", _generic_array_copy_ctr );
1931 if( _slow_array_copy_ctr ) tty->print_cr("%5d slow array copies", _slow_array_copy_ctr );
1932 if( _find_handler_ctr ) tty->print_cr("%5d find exception handler", _find_handler_ctr );
1933 if( _rethrow_ctr ) tty->print_cr("%5d rethrow handler", _rethrow_ctr );
1934
1935 AdapterHandlerLibrary::print_statistics();
1936
1937 if (xtty != NULL) xtty->tail("statistics");
1938 }
1939
1940 inline double percent(int x, int y) {
1941 return 100.0 * x / MAX2(y, 1);
1942 }
1943
1944 class MethodArityHistogram {
1945 public:
1946 enum { MAX_ARITY = 256 };
1947 private:
1948 static int _arity_histogram[MAX_ARITY]; // histogram of #args
1949 static int _size_histogram[MAX_ARITY]; // histogram of arg size in words
1950 static int _max_arity; // max. arity seen
1951 static int _max_size; // max. arg size seen
1952
1953 static void add_method_to_histogram(nmethod* nm) {
1954 Method* m = nm->method();
1955 ArgumentCount args(m->signature());
1956 int arity = args.size() + (m->is_static() ? 0 : 1);
1957 int argsize = m->size_of_parameters();
1958 arity = MIN2(arity, MAX_ARITY-1);
1959 argsize = MIN2(argsize, MAX_ARITY-1);
1960 int count = nm->method()->compiled_invocation_count();
1961 _arity_histogram[arity] += count;
1962 _size_histogram[argsize] += count;
1963 _max_arity = MAX2(_max_arity, arity);
1964 _max_size = MAX2(_max_size, argsize);
1965 }
1966
1967 void print_histogram_helper(int n, int* histo, const char* name) {
1968 const int N = MIN2(5, n);
1969 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
1970 double sum = 0;
1971 double weighted_sum = 0;
1972 int i;
1973 for (i = 0; i <= n; i++) { sum += histo[i]; weighted_sum += i*histo[i]; }
1974 double rest = sum;
1975 double percent = sum / 100;
1976 for (i = 0; i <= N; i++) {
1977 rest -= histo[i];
1978 tty->print_cr("%4d: %7d (%5.1f%%)", i, histo[i], histo[i] / percent);
1979 }
1980 tty->print_cr("rest: %7d (%5.1f%%))", (int)rest, rest / percent);
1981 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n);
1982 }
1983
1984 void print_histogram() {
1985 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
1986 print_histogram_helper(_max_arity, _arity_histogram, "arity");
1987 tty->print_cr("\nSame for parameter size (in words):");
1988 print_histogram_helper(_max_size, _size_histogram, "size");
1989 tty->cr();
1990 }
1991
1992 public:
1993 MethodArityHistogram() {
1994 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1995 _max_arity = _max_size = 0;
1996 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram [i] = 0;
1997 CodeCache::nmethods_do(add_method_to_histogram);
1998 print_histogram();
1999 }
2000 };
2001
2002 int MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY];
2003 int MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY];
2004 int MethodArityHistogram::_max_arity;
2005 int MethodArityHistogram::_max_size;
2006
2007 void SharedRuntime::print_call_statistics(int comp_total) {
2008 tty->print_cr("Calls from compiled code:");
2009 int total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls;
2010 int mono_c = _nof_normal_calls - _nof_optimized_calls - _nof_megamorphic_calls;
2011 int mono_i = _nof_interface_calls - _nof_optimized_interface_calls - _nof_megamorphic_interface_calls;
2012 tty->print_cr("\t%9d (%4.1f%%) total non-inlined ", total, percent(total, total));
2013 tty->print_cr("\t%9d (%4.1f%%) virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total));
2014 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls));
2015 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_calls, percent(_nof_optimized_calls, _nof_normal_calls));
2016 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_c, percent(mono_c, _nof_normal_calls));
2017 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls));
2018 tty->print_cr("\t%9d (%4.1f%%) interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total));
2019 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls));
2020 tty->print_cr("\t %9d (%3.0f%%) optimized ", _nof_optimized_interface_calls, percent(_nof_optimized_interface_calls, _nof_interface_calls));
2021 tty->print_cr("\t %9d (%3.0f%%) monomorphic ", mono_i, percent(mono_i, _nof_interface_calls));
2022 tty->print_cr("\t %9d (%3.0f%%) megamorphic ", _nof_megamorphic_interface_calls, percent(_nof_megamorphic_interface_calls, _nof_interface_calls));
2023 tty->print_cr("\t%9d (%4.1f%%) static/special calls", _nof_static_calls, percent(_nof_static_calls, total));
2024 tty->print_cr("\t %9d (%3.0f%%) inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls));
2025 tty->cr();
2026 tty->print_cr("Note 1: counter updates are not MT-safe.");
2027 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
2028 tty->print_cr(" %% in nested categories are relative to their category");
2029 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
2030 tty->cr();
2031
2032 MethodArityHistogram h;
2033 }
2034 #endif
2035
2036
2037 // A simple wrapper class around the calling convention information
2038 // that allows sharing of adapters for the same calling convention.
2039 class AdapterFingerPrint : public CHeapObj<mtCode> {
2040 private:
2041 enum {
2042 _basic_type_bits = 4,
2043 _basic_type_mask = right_n_bits(_basic_type_bits),
2044 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2045 _compact_int_count = 3
2046 };
2047 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2048 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2049
2050 union {
2051 int _compact[_compact_int_count];
2052 int* _fingerprint;
2053 } _value;
2054 int _length; // A negative length indicates the fingerprint is in the compact form,
2055 // Otherwise _value._fingerprint is the array.
2056
2057 // Remap BasicTypes that are handled equivalently by the adapters.
2058 // These are correct for the current system but someday it might be
2059 // necessary to make this mapping platform dependent.
2060 static int adapter_encoding(BasicType in) {
2061 switch(in) {
2062 case T_BOOLEAN:
2063 case T_BYTE:
2064 case T_SHORT:
2065 case T_CHAR:
2066 // There are all promoted to T_INT in the calling convention
2067 return T_INT;
2068
2069 case T_OBJECT:
2070 case T_ARRAY:
2071 // In other words, we assume that any register good enough for
2072 // an int or long is good enough for a managed pointer.
2073 #ifdef _LP64
2074 return T_LONG;
2075 #else
2076 return T_INT;
2077 #endif
2078
2079 case T_INT:
2080 case T_LONG:
2081 case T_FLOAT:
2082 case T_DOUBLE:
2083 case T_VOID:
2084 return in;
2085
2086 default:
2087 ShouldNotReachHere();
2088 return T_CONFLICT;
2089 }
2090 }
2091
2092 public:
2093 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) {
2094 // The fingerprint is based on the BasicType signature encoded
2095 // into an array of ints with eight entries per int.
2096 int* ptr;
2097 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int;
2098 if (len <= _compact_int_count) {
2099 assert(_compact_int_count == 3, "else change next line");
2100 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0;
2101 // Storing the signature encoded as signed chars hits about 98%
2102 // of the time.
2103 _length = -len;
2104 ptr = _value._compact;
2105 } else {
2106 _length = len;
2107 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode);
2108 ptr = _value._fingerprint;
2109 }
2110
2111 // Now pack the BasicTypes with 8 per int
2112 int sig_index = 0;
2113 for (int index = 0; index < len; index++) {
2114 int value = 0;
2115 for (int byte = 0; byte < _basic_types_per_int; byte++) {
2116 int bt = ((sig_index < total_args_passed)
2117 ? adapter_encoding(sig_bt[sig_index++])
2118 : 0);
2119 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits");
2120 value = (value << _basic_type_bits) | bt;
2121 }
2122 ptr[index] = value;
2123 }
2124 }
2125
2126 ~AdapterFingerPrint() {
2127 if (_length > 0) {
2128 FREE_C_HEAP_ARRAY(int, _value._fingerprint, mtCode);
2129 }
2130 }
2131
2132 int value(int index) {
2133 if (_length < 0) {
2134 return _value._compact[index];
2135 }
2136 return _value._fingerprint[index];
2137 }
2138 int length() {
2139 if (_length < 0) return -_length;
2140 return _length;
2141 }
2142
2143 bool is_compact() {
2144 return _length <= 0;
2145 }
2146
2147 unsigned int compute_hash() {
2148 int hash = 0;
2149 for (int i = 0; i < length(); i++) {
2150 int v = value(i);
2151 hash = (hash << 8) ^ v ^ (hash >> 5);
2152 }
2153 return (unsigned int)hash;
2154 }
2155
2156 const char* as_string() {
2157 stringStream st;
2158 st.print("0x");
2159 for (int i = 0; i < length(); i++) {
2160 st.print("%08x", value(i));
2161 }
2162 return st.as_string();
2163 }
2164
2165 bool equals(AdapterFingerPrint* other) {
2166 if (other->_length != _length) {
2167 return false;
2168 }
2169 if (_length < 0) {
2170 assert(_compact_int_count == 3, "else change next line");
2171 return _value._compact[0] == other->_value._compact[0] &&
2172 _value._compact[1] == other->_value._compact[1] &&
2173 _value._compact[2] == other->_value._compact[2];
2174 } else {
2175 for (int i = 0; i < _length; i++) {
2176 if (_value._fingerprint[i] != other->_value._fingerprint[i]) {
2177 return false;
2178 }
2179 }
2180 }
2181 return true;
2182 }
2183 };
2184
2185
2186 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
2187 class AdapterHandlerTable : public BasicHashtable<mtCode> {
2188 friend class AdapterHandlerTableIterator;
2189
2190 private:
2191
2192 #ifndef PRODUCT
2193 static int _lookups; // number of calls to lookup
2194 static int _buckets; // number of buckets checked
2195 static int _equals; // number of buckets checked with matching hash
2196 static int _hits; // number of successful lookups
2197 static int _compact; // number of equals calls with compact signature
2198 #endif
2199
2200 AdapterHandlerEntry* bucket(int i) {
2201 return (AdapterHandlerEntry*)BasicHashtable<mtCode>::bucket(i);
2202 }
2203
2204 public:
2205 AdapterHandlerTable()
2206 : BasicHashtable<mtCode>(293, sizeof(AdapterHandlerEntry)) { }
2207
2208 // Create a new entry suitable for insertion in the table
2209 AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
2210 AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable<mtCode>::new_entry(fingerprint->compute_hash());
2211 entry->init(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
2212 return entry;
2213 }
2214
2215 // Insert an entry into the table
2216 void add(AdapterHandlerEntry* entry) {
2217 int index = hash_to_index(entry->hash());
2218 add_entry(index, entry);
2219 }
2220
2221 void free_entry(AdapterHandlerEntry* entry) {
2222 entry->deallocate();
2223 BasicHashtable<mtCode>::free_entry(entry);
2224 }
2225
2226 // Find a entry with the same fingerprint if it exists
2227 AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) {
2228 NOT_PRODUCT(_lookups++);
2229 AdapterFingerPrint fp(total_args_passed, sig_bt);
2230 unsigned int hash = fp.compute_hash();
2231 int index = hash_to_index(hash);
2232 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2233 NOT_PRODUCT(_buckets++);
2234 if (e->hash() == hash) {
2235 NOT_PRODUCT(_equals++);
2236 if (fp.equals(e->fingerprint())) {
2237 #ifndef PRODUCT
2238 if (fp.is_compact()) _compact++;
2239 _hits++;
2240 #endif
2241 return e;
2242 }
2243 }
2244 }
2245 return NULL;
2246 }
2247
2248 #ifndef PRODUCT
2249 void print_statistics() {
2250 ResourceMark rm;
2251 int longest = 0;
2252 int empty = 0;
2253 int total = 0;
2254 int nonempty = 0;
2255 for (int index = 0; index < table_size(); index++) {
2256 int count = 0;
2257 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2258 count++;
2259 }
2260 if (count != 0) nonempty++;
2261 if (count == 0) empty++;
2262 if (count > longest) longest = count;
2263 total += count;
2264 }
2265 tty->print_cr("AdapterHandlerTable: empty %d longest %d total %d average %f",
2266 empty, longest, total, total / (double)nonempty);
2267 tty->print_cr("AdapterHandlerTable: lookups %d buckets %d equals %d hits %d compact %d",
2268 _lookups, _buckets, _equals, _hits, _compact);
2269 }
2270 #endif
2271 };
2272
2273
2274 #ifndef PRODUCT
2275
2276 int AdapterHandlerTable::_lookups;
2277 int AdapterHandlerTable::_buckets;
2278 int AdapterHandlerTable::_equals;
2279 int AdapterHandlerTable::_hits;
2280 int AdapterHandlerTable::_compact;
2281
2282 #endif
2283
2284 class AdapterHandlerTableIterator : public StackObj {
2285 private:
2286 AdapterHandlerTable* _table;
2287 int _index;
2288 AdapterHandlerEntry* _current;
2289
2290 void scan() {
2291 while (_index < _table->table_size()) {
2292 AdapterHandlerEntry* a = _table->bucket(_index);
2293 _index++;
2294 if (a != NULL) {
2295 _current = a;
2296 return;
2297 }
2298 }
2299 }
2300
2301 public:
2302 AdapterHandlerTableIterator(AdapterHandlerTable* table): _table(table), _index(0), _current(NULL) {
2303 scan();
2304 }
2305 bool has_next() {
2306 return _current != NULL;
2307 }
2308 AdapterHandlerEntry* next() {
2309 if (_current != NULL) {
2310 AdapterHandlerEntry* result = _current;
2311 _current = _current->next();
2312 if (_current == NULL) scan();
2313 return result;
2314 } else {
2315 return NULL;
2316 }
2317 }
2318 };
2319
2320
2321 // ---------------------------------------------------------------------------
2322 // Implementation of AdapterHandlerLibrary
2323 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL;
2324 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL;
2325 const int AdapterHandlerLibrary_size = 16*K;
2326 BufferBlob* AdapterHandlerLibrary::_buffer = NULL;
2327
2328 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2329 // Should be called only when AdapterHandlerLibrary_lock is active.
2330 if (_buffer == NULL) // Initialize lazily
2331 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2332 return _buffer;
2333 }
2334
2335 void AdapterHandlerLibrary::initialize() {
2336 if (_adapters != NULL) return;
2337 _adapters = new AdapterHandlerTable();
2338
2339 // Create a special handler for abstract methods. Abstract methods
2340 // are never compiled so an i2c entry is somewhat meaningless, but
2341 // throw AbstractMethodError just in case.
2342 // Pass wrong_method_abstract for the c2i transitions to return
2343 // AbstractMethodError for invalid invocations.
2344 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
2345 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL),
2346 StubRoutines::throw_AbstractMethodError_entry(),
2347 wrong_method_abstract, wrong_method_abstract);
2348 }
2349
2350 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint,
2351 address i2c_entry,
2352 address c2i_entry,
2353 address c2i_unverified_entry) {
2354 return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
2355 }
2356
2357 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(methodHandle method) {
2358 // Use customized signature handler. Need to lock around updates to
2359 // the AdapterHandlerTable (it is not safe for concurrent readers
2360 // and a single writer: this could be fixed if it becomes a
2361 // problem).
2362
2363 // Get the address of the ic_miss handlers before we grab the
2364 // AdapterHandlerLibrary_lock. This fixes bug 6236259 which
2365 // was caused by the initialization of the stubs happening
2366 // while we held the lock and then notifying jvmti while
2367 // holding it. This just forces the initialization to be a little
2368 // earlier.
2369 address ic_miss = SharedRuntime::get_ic_miss_stub();
2370 assert(ic_miss != NULL, "must have handler");
2371
2372 ResourceMark rm;
2373
2374 NOT_PRODUCT(int insts_size);
2375 AdapterBlob* new_adapter = NULL;
2376 AdapterHandlerEntry* entry = NULL;
2377 AdapterFingerPrint* fingerprint = NULL;
2378 {
2379 MutexLocker mu(AdapterHandlerLibrary_lock);
2380 // make sure data structure is initialized
2381 initialize();
2382
2383 if (method->is_abstract()) {
2384 return _abstract_method_handler;
2385 }
2386
2387 // Fill in the signature array, for the calling-convention call.
2388 int total_args_passed = method->size_of_parameters(); // All args on stack
2389
2390 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2391 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2392 int i = 0;
2393 if (!method->is_static()) // Pass in receiver first
2394 sig_bt[i++] = T_OBJECT;
2395 for (SignatureStream ss(method->signature()); !ss.at_return_type(); ss.next()) {
2396 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2397 if (ss.type() == T_LONG || ss.type() == T_DOUBLE)
2398 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2399 }
2400 assert(i == total_args_passed, "");
2401
2402 // Lookup method signature's fingerprint
2403 entry = _adapters->lookup(total_args_passed, sig_bt);
2404
2405 #ifdef ASSERT
2406 AdapterHandlerEntry* shared_entry = NULL;
2407 // Start adapter sharing verification only after the VM is booted.
2408 if (VerifyAdapterSharing && (entry != NULL)) {
2409 shared_entry = entry;
2410 entry = NULL;
2411 }
2412 #endif
2413
2414 if (entry != NULL) {
2415 return entry;
2416 }
2417
2418 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
2419 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false);
2420
2421 // Make a C heap allocated version of the fingerprint to store in the adapter
2422 fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt);
2423
2424 // StubRoutines::code2() is initialized after this function can be called. As a result,
2425 // VerifyAdapterCalls and VerifyAdapterSharing can fail if we re-use code that generated
2426 // prior to StubRoutines::code2() being set. Checks refer to checks generated in an I2C
2427 // stub that ensure that an I2C stub is called from an interpreter frame.
2428 bool contains_all_checks = StubRoutines::code2() != NULL;
2429
2430 // Create I2C & C2I handlers
2431 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2432 if (buf != NULL) {
2433 CodeBuffer buffer(buf);
2434 short buffer_locs[20];
2435 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
2436 sizeof(buffer_locs)/sizeof(relocInfo));
2437
2438 MacroAssembler _masm(&buffer);
2439 entry = SharedRuntime::generate_i2c2i_adapters(&_masm,
2440 total_args_passed,
2441 comp_args_on_stack,
2442 sig_bt,
2443 regs,
2444 fingerprint);
2445 #ifdef ASSERT
2446 if (VerifyAdapterSharing) {
2447 if (shared_entry != NULL) {
2448 assert(shared_entry->compare_code(buf->code_begin(), buffer.insts_size()), "code must match");
2449 // Release the one just created and return the original
2450 _adapters->free_entry(entry);
2451 return shared_entry;
2452 } else {
2453 entry->save_code(buf->code_begin(), buffer.insts_size());
2454 }
2455 }
2456 #endif
2457
2458 new_adapter = AdapterBlob::create(&buffer);
2459 NOT_PRODUCT(insts_size = buffer.insts_size());
2460 }
2461 if (new_adapter == NULL) {
2462 // CodeCache is full, disable compilation
2463 // Ought to log this but compile log is only per compile thread
2464 // and we're some non descript Java thread.
2465 MutexUnlocker mu(AdapterHandlerLibrary_lock);
2466 CompileBroker::handle_full_code_cache();
2467 return NULL; // Out of CodeCache space
2468 }
2469 entry->relocate(new_adapter->content_begin());
2470 #ifndef PRODUCT
2471 // debugging suppport
2472 if (PrintAdapterHandlers || PrintStubCode) {
2473 ttyLocker ttyl;
2474 entry->print_adapter_on(tty);
2475 tty->print_cr("i2c argument handler #%d for: %s %s (%d bytes generated)",
2476 _adapters->number_of_entries(), (method->is_static() ? "static" : "receiver"),
2477 method->signature()->as_C_string(), insts_size);
2478 tty->print_cr("c2i argument handler starts at %p",entry->get_c2i_entry());
2479 if (Verbose || PrintStubCode) {
2480 address first_pc = entry->base_address();
2481 if (first_pc != NULL) {
2482 Disassembler::decode(first_pc, first_pc + insts_size);
2483 tty->cr();
2484 }
2485 }
2486 }
2487 #endif
2488 // Add the entry only if the entry contains all required checks (see sharedRuntime_xxx.cpp)
2489 // The checks are inserted only if -XX:+VerifyAdapterCalls is specified.
2490 if (contains_all_checks || !VerifyAdapterCalls) {
2491 _adapters->add(entry);
2492 }
2493 }
2494 // Outside of the lock
2495 if (new_adapter != NULL) {
2496 char blob_id[256];
2497 jio_snprintf(blob_id,
2498 sizeof(blob_id),
2499 "%s(%s)@" PTR_FORMAT,
2500 new_adapter->name(),
2501 fingerprint->as_string(),
2502 new_adapter->content_begin());
2503 Forte::register_stub(blob_id, new_adapter->content_begin(),new_adapter->content_end());
2504
2505 if (JvmtiExport::should_post_dynamic_code_generated()) {
2506 JvmtiExport::post_dynamic_code_generated(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2507 }
2508 }
2509 return entry;
2510 }
2511
2512 address AdapterHandlerEntry::base_address() {
2513 address base = _i2c_entry;
2514 if (base == NULL) base = _c2i_entry;
2515 assert(base <= _c2i_entry || _c2i_entry == NULL, "");
2516 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == NULL, "");
2517 return base;
2518 }
2519
2520 void AdapterHandlerEntry::relocate(address new_base) {
2521 address old_base = base_address();
2522 assert(old_base != NULL, "");
2523 ptrdiff_t delta = new_base - old_base;
2524 if (_i2c_entry != NULL)
2525 _i2c_entry += delta;
2526 if (_c2i_entry != NULL)
2527 _c2i_entry += delta;
2528 if (_c2i_unverified_entry != NULL)
2529 _c2i_unverified_entry += delta;
2530 assert(base_address() == new_base, "");
2531 }
2532
2533
2534 void AdapterHandlerEntry::deallocate() {
2535 delete _fingerprint;
2536 #ifdef ASSERT
2537 if (_saved_code) FREE_C_HEAP_ARRAY(unsigned char, _saved_code, mtCode);
2538 #endif
2539 }
2540
2541
2542 #ifdef ASSERT
2543 // Capture the code before relocation so that it can be compared
2544 // against other versions. If the code is captured after relocation
2545 // then relative instructions won't be equivalent.
2546 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
2547 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
2548 _saved_code_length = length;
2549 memcpy(_saved_code, buffer, length);
2550 }
2551
2552
2553 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length) {
2554 if (length != _saved_code_length) {
2555 return false;
2556 }
2557
2558 return (memcmp(buffer, _saved_code, length) == 0) ? true : false;
2559 }
2560 #endif
2561
2562
2563 /**
2564 * Create a native wrapper for this native method. The wrapper converts the
2565 * Java-compiled calling convention to the native convention, handles
2566 * arguments, and transitions to native. On return from the native we transition
2567 * back to java blocking if a safepoint is in progress.
2568 */
2569 void AdapterHandlerLibrary::create_native_wrapper(methodHandle method) {
2570 ResourceMark rm;
2571 nmethod* nm = NULL;
2572
2573 assert(method->is_native(), "must be native");
2574 assert(method->is_method_handle_intrinsic() ||
2575 method->has_native_function(), "must have something valid to call!");
2576
2577 {
2578 // Perform the work while holding the lock, but perform any printing outside the lock
2579 MutexLocker mu(AdapterHandlerLibrary_lock);
2580 // See if somebody beat us to it
2581 nm = method->code();
2582 if (nm != NULL) {
2583 return;
2584 }
2585
2586 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci);
2587 assert(compile_id > 0, "Must generate native wrapper");
2588
2589
2590 ResourceMark rm;
2591 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2592 if (buf != NULL) {
2593 CodeBuffer buffer(buf);
2594 double locs_buf[20];
2595 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2596 MacroAssembler _masm(&buffer);
2597
2598 // Fill in the signature array, for the calling-convention call.
2599 const int total_args_passed = method->size_of_parameters();
2600
2601 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2602 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2603 int i=0;
2604 if( !method->is_static() ) // Pass in receiver first
2605 sig_bt[i++] = T_OBJECT;
2606 SignatureStream ss(method->signature());
2607 for( ; !ss.at_return_type(); ss.next()) {
2608 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2609 if( ss.type() == T_LONG || ss.type() == T_DOUBLE )
2610 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2611 }
2612 assert(i == total_args_passed, "");
2613 BasicType ret_type = ss.type();
2614
2615 // Now get the compiled-Java layout as input (or output) arguments.
2616 // NOTE: Stubs for compiled entry points of method handle intrinsics
2617 // are just trampolines so the argument registers must be outgoing ones.
2618 const bool is_outgoing = method->is_method_handle_intrinsic();
2619 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, is_outgoing);
2620
2621 // Generate the compiled-to-native wrapper code
2622 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type);
2623
2624 if (nm != NULL) {
2625 method->set_code(method, nm);
2626 }
2627 }
2628 } // Unlock AdapterHandlerLibrary_lock
2629
2630
2631 // Install the generated code.
2632 if (nm != NULL) {
2633 if (PrintCompilation) {
2634 ttyLocker ttyl;
2635 CompileTask::print_compilation(tty, nm, method->is_static() ? "(static)" : "");
2636 }
2637 nm->post_compiled_method_load_event();
2638 } else {
2639 // CodeCache is full, disable compilation
2640 CompileBroker::handle_full_code_cache();
2641 }
2642 }
2643
2644 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::block_for_jni_critical(JavaThread* thread))
2645 assert(thread == JavaThread::current(), "must be");
2646 // The code is about to enter a JNI lazy critical native method and
2647 // _needs_gc is true, so if this thread is already in a critical
2648 // section then just return, otherwise this thread should block
2649 // until needs_gc has been cleared.
2650 if (thread->in_critical()) {
2651 return;
2652 }
2653 // Lock and unlock a critical section to give the system a chance to block
2654 GC_locker::lock_critical(thread);
2655 GC_locker::unlock_critical(thread);
2656 JRT_END
2657
2658 #ifdef HAVE_DTRACE_H
2659 // Create a dtrace nmethod for this method. The wrapper converts the
2660 // java compiled calling convention to the native convention, makes a dummy call
2661 // (actually nops for the size of the call instruction, which become a trap if
2662 // probe is enabled). The returns to the caller. Since this all looks like a
2663 // leaf no thread transition is needed.
2664
2665 nmethod *AdapterHandlerLibrary::create_dtrace_nmethod(methodHandle method) {
2666 ResourceMark rm;
2667 nmethod* nm = NULL;
2668
2669 if (PrintCompilation) {
2670 ttyLocker ttyl;
2671 tty->print("--- n%s ");
2672 method->print_short_name(tty);
2673 if (method->is_static()) {
2674 tty->print(" (static)");
2675 }
2676 tty->cr();
2677 }
2678
2679 {
2680 // perform the work while holding the lock, but perform any printing
2681 // outside the lock
2682 MutexLocker mu(AdapterHandlerLibrary_lock);
2683 // See if somebody beat us to it
2684 nm = method->code();
2685 if (nm) {
2686 return nm;
2687 }
2688
2689 ResourceMark rm;
2690
2691 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2692 if (buf != NULL) {
2693 CodeBuffer buffer(buf);
2694 // Need a few relocation entries
2695 double locs_buf[20];
2696 buffer.insts()->initialize_shared_locs(
2697 (relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2698 MacroAssembler _masm(&buffer);
2699
2700 // Generate the compiled-to-native wrapper code
2701 nm = SharedRuntime::generate_dtrace_nmethod(&_masm, method);
2702 }
2703 }
2704 return nm;
2705 }
2706
2707 // the dtrace method needs to convert java lang string to utf8 string.
2708 void SharedRuntime::get_utf(oopDesc* src, address dst) {
2709 typeArrayOop jlsValue = java_lang_String::value(src);
2710 int jlsOffset = java_lang_String::offset(src);
2711 int jlsLen = java_lang_String::length(src);
2712 jchar* jlsPos = (jlsLen == 0) ? NULL :
2713 jlsValue->char_at_addr(jlsOffset);
2714 assert(TypeArrayKlass::cast(jlsValue->klass())->element_type() == T_CHAR, "compressed string");
2715 (void) UNICODE::as_utf8(jlsPos, jlsLen, (char *)dst, max_dtrace_string_size);
2716 }
2717 #endif // ndef HAVE_DTRACE_H
2718
2719 int SharedRuntime::convert_ints_to_longints_argcnt(int in_args_count, BasicType* in_sig_bt) {
2720 int argcnt = in_args_count;
2721 if (CCallingConventionRequiresIntsAsLongs) {
2722 for (int in = 0; in < in_args_count; in++) {
2723 BasicType bt = in_sig_bt[in];
2724 switch (bt) {
2725 case T_BOOLEAN:
2726 case T_CHAR:
2727 case T_BYTE:
2728 case T_SHORT:
2729 case T_INT:
2730 argcnt++;
2731 break;
2732 default:
2733 break;
2734 }
2735 }
2736 } else {
2737 assert(0, "This should not be needed on this platform");
2738 }
2739
2740 return argcnt;
2741 }
2742
2743 void SharedRuntime::convert_ints_to_longints(int i2l_argcnt, int& in_args_count,
2744 BasicType*& in_sig_bt, VMRegPair*& in_regs) {
2745 if (CCallingConventionRequiresIntsAsLongs) {
2746 VMRegPair *new_in_regs = NEW_RESOURCE_ARRAY(VMRegPair, i2l_argcnt);
2747 BasicType *new_in_sig_bt = NEW_RESOURCE_ARRAY(BasicType, i2l_argcnt);
2748
2749 int argcnt = 0;
2750 for (int in = 0; in < in_args_count; in++, argcnt++) {
2751 BasicType bt = in_sig_bt[in];
2752 VMRegPair reg = in_regs[in];
2753 switch (bt) {
2754 case T_BOOLEAN:
2755 case T_CHAR:
2756 case T_BYTE:
2757 case T_SHORT:
2758 case T_INT:
2759 // Convert (bt) to (T_LONG,bt).
2760 new_in_sig_bt[argcnt ] = T_LONG;
2761 new_in_sig_bt[argcnt+1] = bt;
2762 assert(reg.first()->is_valid() && !reg.second()->is_valid(), "");
2763 new_in_regs[argcnt ].set2(reg.first());
2764 new_in_regs[argcnt+1].set_bad();
2765 argcnt++;
2766 break;
2767 default:
2768 // No conversion needed.
2769 new_in_sig_bt[argcnt] = bt;
2770 new_in_regs[argcnt] = reg;
2771 break;
2772 }
2773 }
2774 assert(argcnt == i2l_argcnt, "must match");
2775
2776 in_regs = new_in_regs;
2777 in_sig_bt = new_in_sig_bt;
2778 in_args_count = i2l_argcnt;
2779 } else {
2780 assert(0, "This should not be needed on this platform");
2781 }
2782 }
2783
2784 // -------------------------------------------------------------------------
2785 // Java-Java calling convention
2786 // (what you use when Java calls Java)
2787
2788 //------------------------------name_for_receiver----------------------------------
2789 // For a given signature, return the VMReg for parameter 0.
2790 VMReg SharedRuntime::name_for_receiver() {
2791 VMRegPair regs;
2792 BasicType sig_bt = T_OBJECT;
2793 (void) java_calling_convention(&sig_bt, ®s, 1, true);
2794 // Return argument 0 register. In the LP64 build pointers
2795 // take 2 registers, but the VM wants only the 'main' name.
2796 return regs.first();
2797 }
2798
2799 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) {
2800 // This method is returning a data structure allocating as a
2801 // ResourceObject, so do not put any ResourceMarks in here.
2802 char *s = sig->as_C_string();
2803 int len = (int)strlen(s);
2804 s++; len--; // Skip opening paren
2805 char *t = s+len;
2806 while( *(--t) != ')' ) ; // Find close paren
2807
2808 BasicType *sig_bt = NEW_RESOURCE_ARRAY( BasicType, 256 );
2809 VMRegPair *regs = NEW_RESOURCE_ARRAY( VMRegPair, 256 );
2810 int cnt = 0;
2811 if (has_receiver) {
2812 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature
2813 }
2814
2815 while( s < t ) {
2816 switch( *s++ ) { // Switch on signature character
2817 case 'B': sig_bt[cnt++] = T_BYTE; break;
2818 case 'C': sig_bt[cnt++] = T_CHAR; break;
2819 case 'D': sig_bt[cnt++] = T_DOUBLE; sig_bt[cnt++] = T_VOID; break;
2820 case 'F': sig_bt[cnt++] = T_FLOAT; break;
2821 case 'I': sig_bt[cnt++] = T_INT; break;
2822 case 'J': sig_bt[cnt++] = T_LONG; sig_bt[cnt++] = T_VOID; break;
2823 case 'S': sig_bt[cnt++] = T_SHORT; break;
2824 case 'Z': sig_bt[cnt++] = T_BOOLEAN; break;
2825 case 'V': sig_bt[cnt++] = T_VOID; break;
2826 case 'L': // Oop
2827 while( *s++ != ';' ) ; // Skip signature
2828 sig_bt[cnt++] = T_OBJECT;
2829 break;
2830 case '[': { // Array
2831 do { // Skip optional size
2832 while( *s >= '0' && *s <= '9' ) s++;
2833 } while( *s++ == '[' ); // Nested arrays?
2834 // Skip element type
2835 if( s[-1] == 'L' )
2836 while( *s++ != ';' ) ; // Skip signature
2837 sig_bt[cnt++] = T_ARRAY;
2838 break;
2839 }
2840 default : ShouldNotReachHere();
2841 }
2842 }
2843
2844 if (has_appendix) {
2845 sig_bt[cnt++] = T_OBJECT;
2846 }
2847
2848 assert( cnt < 256, "grow table size" );
2849
2850 int comp_args_on_stack;
2851 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt, true);
2852
2853 // the calling convention doesn't count out_preserve_stack_slots so
2854 // we must add that in to get "true" stack offsets.
2855
2856 if (comp_args_on_stack) {
2857 for (int i = 0; i < cnt; i++) {
2858 VMReg reg1 = regs[i].first();
2859 if( reg1->is_stack()) {
2860 // Yuck
2861 reg1 = reg1->bias(out_preserve_stack_slots());
2862 }
2863 VMReg reg2 = regs[i].second();
2864 if( reg2->is_stack()) {
2865 // Yuck
2866 reg2 = reg2->bias(out_preserve_stack_slots());
2867 }
2868 regs[i].set_pair(reg2, reg1);
2869 }
2870 }
2871
2872 // results
2873 *arg_size = cnt;
2874 return regs;
2875 }
2876
2877 // OSR Migration Code
2878 //
2879 // This code is used convert interpreter frames into compiled frames. It is
2880 // called from very start of a compiled OSR nmethod. A temp array is
2881 // allocated to hold the interesting bits of the interpreter frame. All
2882 // active locks are inflated to allow them to move. The displaced headers and
2883 // active interpreter locals are copied into the temp buffer. Then we return
2884 // back to the compiled code. The compiled code then pops the current
2885 // interpreter frame off the stack and pushes a new compiled frame. Then it
2886 // copies the interpreter locals and displaced headers where it wants.
2887 // Finally it calls back to free the temp buffer.
2888 //
2889 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed.
2890
2891 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *thread) )
2892
2893 //
2894 // This code is dependent on the memory layout of the interpreter local
2895 // array and the monitors. On all of our platforms the layout is identical
2896 // so this code is shared. If some platform lays the their arrays out
2897 // differently then this code could move to platform specific code or
2898 // the code here could be modified to copy items one at a time using
2899 // frame accessor methods and be platform independent.
2900
2901 frame fr = thread->last_frame();
2902 assert( fr.is_interpreted_frame(), "" );
2903 assert( fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks" );
2904
2905 // Figure out how many monitors are active.
2906 int active_monitor_count = 0;
2907 for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
2908 kptr < fr.interpreter_frame_monitor_begin();
2909 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
2910 if( kptr->obj() != NULL ) active_monitor_count++;
2911 }
2912
2913 // QQQ we could place number of active monitors in the array so that compiled code
2914 // could double check it.
2915
2916 Method* moop = fr.interpreter_frame_method();
2917 int max_locals = moop->max_locals();
2918 // Allocate temp buffer, 1 word per local & 2 per active monitor
2919 int buf_size_words = max_locals + active_monitor_count*2;
2920 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode);
2921
2922 // Copy the locals. Order is preserved so that loading of longs works.
2923 // Since there's no GC I can copy the oops blindly.
2924 assert( sizeof(HeapWord)==sizeof(intptr_t), "fix this code");
2925 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
2926 (HeapWord*)&buf[0],
2927 max_locals);
2928
2929 // Inflate locks. Copy the displaced headers. Be careful, there can be holes.
2930 int i = max_locals;
2931 for( BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();
2932 kptr2 < fr.interpreter_frame_monitor_begin();
2933 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {
2934 if( kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array
2935 BasicLock *lock = kptr2->lock();
2936 // Inflate so the displaced header becomes position-independent
2937 if (lock->displaced_header()->is_unlocked())
2938 ObjectSynchronizer::inflate_helper(kptr2->obj());
2939 // Now the displaced header is free to move
2940 buf[i++] = (intptr_t)lock->displaced_header();
2941 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj());
2942 }
2943 }
2944 assert( i - max_locals == active_monitor_count*2, "found the expected number of monitors" );
2945
2946 return buf;
2947 JRT_END
2948
2949 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) )
2950 FREE_C_HEAP_ARRAY(intptr_t,buf, mtCode);
2951 JRT_END
2952
2953 bool AdapterHandlerLibrary::contains(CodeBlob* b) {
2954 AdapterHandlerTableIterator iter(_adapters);
2955 while (iter.has_next()) {
2956 AdapterHandlerEntry* a = iter.next();
2957 if ( b == CodeCache::find_blob(a->get_i2c_entry()) ) return true;
2958 }
2959 return false;
2960 }
2961
2962 void AdapterHandlerLibrary::print_handler_on(outputStream* st, CodeBlob* b) {
2963 AdapterHandlerTableIterator iter(_adapters);
2964 while (iter.has_next()) {
2965 AdapterHandlerEntry* a = iter.next();
2966 if (b == CodeCache::find_blob(a->get_i2c_entry())) {
2967 st->print("Adapter for signature: ");
2968 a->print_adapter_on(tty);
2969 return;
2970 }
2971 }
2972 assert(false, "Should have found handler");
2973 }
2974
2975 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
2976 st->print_cr("AHE@" INTPTR_FORMAT ": %s i2c: " INTPTR_FORMAT " c2i: " INTPTR_FORMAT " c2iUV: " INTPTR_FORMAT,
2977 (intptr_t) this, fingerprint()->as_string(),
2978 get_i2c_entry(), get_c2i_entry(), get_c2i_unverified_entry());
2979
2980 }
2981
2982 #ifndef PRODUCT
2983
2984 void AdapterHandlerLibrary::print_statistics() {
2985 _adapters->print_statistics();
2986 }
2987
2988 #endif /* PRODUCT */