1/*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "jvm.h"
27#include "asm/assembler.inline.hpp"
28#include "code/codeCache.hpp"
29#include "code/compiledIC.hpp"
30#include "code/compiledMethod.inline.hpp"
31#include "code/dependencies.hpp"
32#include "code/nativeInst.hpp"
33#include "code/nmethod.hpp"
34#include "code/scopeDesc.hpp"
35#include "compiler/abstractCompiler.hpp"
36#include "compiler/compileBroker.hpp"
37#include "compiler/compileLog.hpp"
38#include "compiler/compilerDirectives.hpp"
39#include "compiler/directivesParser.hpp"
40#include "compiler/disassembler.hpp"
41#include "interpreter/bytecode.hpp"
42#include "logging/log.hpp"
43#include "logging/logStream.hpp"
44#include "memory/allocation.inline.hpp"
45#include "memory/resourceArea.hpp"
46#include "memory/universe.hpp"
47#include "oops/access.inline.hpp"
48#include "oops/method.inline.hpp"
49#include "oops/methodData.hpp"
50#include "oops/oop.inline.hpp"
51#include "prims/jvmtiImpl.hpp"
52#include "runtime/atomic.hpp"
53#include "runtime/flags/flagSetting.hpp"
54#include "runtime/frame.inline.hpp"
55#include "runtime/handles.inline.hpp"
56#include "runtime/jniHandles.inline.hpp"
57#include "runtime/orderAccess.hpp"
58#include "runtime/os.hpp"
59#include "runtime/safepointVerifiers.hpp"
60#include "runtime/sharedRuntime.hpp"
61#include "runtime/sweeper.hpp"
62#include "runtime/vmThread.hpp"
63#include "utilities/align.hpp"
64#include "utilities/dtrace.hpp"
65#include "utilities/events.hpp"
66#include "utilities/resourceHash.hpp"
67#include "utilities/xmlstream.hpp"
68#if INCLUDE_JVMCI
69#include "jvmci/jvmciRuntime.hpp"
70#endif
71
72#ifdef DTRACE_ENABLED
73
74// Only bother with this argument setup if dtrace is available
75
76#define DTRACE_METHOD_UNLOAD_PROBE(method) \
77 { \
78 Method* m = (method); \
79 if (m != NULL) { \
80 Symbol* klass_name = m->klass_name(); \
81 Symbol* name = m->name(); \
82 Symbol* signature = m->signature(); \
83 HOTSPOT_COMPILED_METHOD_UNLOAD( \
84 (char *) klass_name->bytes(), klass_name->utf8_length(), \
85 (char *) name->bytes(), name->utf8_length(), \
86 (char *) signature->bytes(), signature->utf8_length()); \
87 } \
88 }
89
90#else // ndef DTRACE_ENABLED
91
92#define DTRACE_METHOD_UNLOAD_PROBE(method)
93
94#endif
95
96//---------------------------------------------------------------------------------
97// NMethod statistics
98// They are printed under various flags, including:
99// PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
100// (In the latter two cases, they like other stats are printed to the log only.)
101
102#ifndef PRODUCT
103// These variables are put into one block to reduce relocations
104// and make it simpler to print from the debugger.
105struct java_nmethod_stats_struct {
106 int nmethod_count;
107 int total_size;
108 int relocation_size;
109 int consts_size;
110 int insts_size;
111 int stub_size;
112 int scopes_data_size;
113 int scopes_pcs_size;
114 int dependencies_size;
115 int handler_table_size;
116 int nul_chk_table_size;
117#if INCLUDE_JVMCI
118 int speculations_size;
119 int jvmci_data_size;
120#endif
121 int oops_size;
122 int metadata_size;
123
124 void note_nmethod(nmethod* nm) {
125 nmethod_count += 1;
126 total_size += nm->size();
127 relocation_size += nm->relocation_size();
128 consts_size += nm->consts_size();
129 insts_size += nm->insts_size();
130 stub_size += nm->stub_size();
131 oops_size += nm->oops_size();
132 metadata_size += nm->metadata_size();
133 scopes_data_size += nm->scopes_data_size();
134 scopes_pcs_size += nm->scopes_pcs_size();
135 dependencies_size += nm->dependencies_size();
136 handler_table_size += nm->handler_table_size();
137 nul_chk_table_size += nm->nul_chk_table_size();
138#if INCLUDE_JVMCI
139 speculations_size += nm->speculations_size();
140 jvmci_data_size += nm->jvmci_data_size();
141#endif
142 }
143 void print_nmethod_stats(const char* name) {
144 if (nmethod_count == 0) return;
145 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name);
146 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size);
147 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod));
148 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size);
149 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size);
150 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size);
151 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size);
152 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size);
153 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size);
154 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size);
155 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size);
156 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size);
157 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size);
158 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size);
159#if INCLUDE_JVMCI
160 if (speculations_size != 0) tty->print_cr(" speculations = %d", speculations_size);
161 if (jvmci_data_size != 0) tty->print_cr(" JVMCI data = %d", jvmci_data_size);
162#endif
163 }
164};
165
166struct native_nmethod_stats_struct {
167 int native_nmethod_count;
168 int native_total_size;
169 int native_relocation_size;
170 int native_insts_size;
171 int native_oops_size;
172 int native_metadata_size;
173 void note_native_nmethod(nmethod* nm) {
174 native_nmethod_count += 1;
175 native_total_size += nm->size();
176 native_relocation_size += nm->relocation_size();
177 native_insts_size += nm->insts_size();
178 native_oops_size += nm->oops_size();
179 native_metadata_size += nm->metadata_size();
180 }
181 void print_native_nmethod_stats() {
182 if (native_nmethod_count == 0) return;
183 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
184 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size);
185 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size);
186 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size);
187 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size);
188 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size);
189 }
190};
191
192struct pc_nmethod_stats_struct {
193 int pc_desc_resets; // number of resets (= number of caches)
194 int pc_desc_queries; // queries to nmethod::find_pc_desc
195 int pc_desc_approx; // number of those which have approximate true
196 int pc_desc_repeats; // number of _pc_descs[0] hits
197 int pc_desc_hits; // number of LRU cache hits
198 int pc_desc_tests; // total number of PcDesc examinations
199 int pc_desc_searches; // total number of quasi-binary search steps
200 int pc_desc_adds; // number of LUR cache insertions
201
202 void print_pc_stats() {
203 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query",
204 pc_desc_queries,
205 (double)(pc_desc_tests + pc_desc_searches)
206 / pc_desc_queries);
207 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
208 pc_desc_resets,
209 pc_desc_queries, pc_desc_approx,
210 pc_desc_repeats, pc_desc_hits,
211 pc_desc_tests, pc_desc_searches, pc_desc_adds);
212 }
213};
214
215#ifdef COMPILER1
216static java_nmethod_stats_struct c1_java_nmethod_stats;
217#endif
218#ifdef COMPILER2
219static java_nmethod_stats_struct c2_java_nmethod_stats;
220#endif
221#if INCLUDE_JVMCI
222static java_nmethod_stats_struct jvmci_java_nmethod_stats;
223#endif
224static java_nmethod_stats_struct unknown_java_nmethod_stats;
225
226static native_nmethod_stats_struct native_nmethod_stats;
227static pc_nmethod_stats_struct pc_nmethod_stats;
228
229static void note_java_nmethod(nmethod* nm) {
230#ifdef COMPILER1
231 if (nm->is_compiled_by_c1()) {
232 c1_java_nmethod_stats.note_nmethod(nm);
233 } else
234#endif
235#ifdef COMPILER2
236 if (nm->is_compiled_by_c2()) {
237 c2_java_nmethod_stats.note_nmethod(nm);
238 } else
239#endif
240#if INCLUDE_JVMCI
241 if (nm->is_compiled_by_jvmci()) {
242 jvmci_java_nmethod_stats.note_nmethod(nm);
243 } else
244#endif
245 {
246 unknown_java_nmethod_stats.note_nmethod(nm);
247 }
248}
249#endif // !PRODUCT
250
251//---------------------------------------------------------------------------------
252
253
254ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
255 assert(pc != NULL, "Must be non null");
256 assert(exception.not_null(), "Must be non null");
257 assert(handler != NULL, "Must be non null");
258
259 _count = 0;
260 _exception_type = exception->klass();
261 _next = NULL;
262 _purge_list_next = NULL;
263
264 add_address_and_handler(pc,handler);
265}
266
267
268address ExceptionCache::match(Handle exception, address pc) {
269 assert(pc != NULL,"Must be non null");
270 assert(exception.not_null(),"Must be non null");
271 if (exception->klass() == exception_type()) {
272 return (test_address(pc));
273 }
274
275 return NULL;
276}
277
278
279bool ExceptionCache::match_exception_with_space(Handle exception) {
280 assert(exception.not_null(),"Must be non null");
281 if (exception->klass() == exception_type() && count() < cache_size) {
282 return true;
283 }
284 return false;
285}
286
287
288address ExceptionCache::test_address(address addr) {
289 int limit = count();
290 for (int i = 0; i < limit; i++) {
291 if (pc_at(i) == addr) {
292 return handler_at(i);
293 }
294 }
295 return NULL;
296}
297
298
299bool ExceptionCache::add_address_and_handler(address addr, address handler) {
300 if (test_address(addr) == handler) return true;
301
302 int index = count();
303 if (index < cache_size) {
304 set_pc_at(index, addr);
305 set_handler_at(index, handler);
306 increment_count();
307 return true;
308 }
309 return false;
310}
311
312ExceptionCache* ExceptionCache::next() {
313 return Atomic::load(&_next);
314}
315
316void ExceptionCache::set_next(ExceptionCache *ec) {
317 Atomic::store(ec, &_next);
318}
319
320//-----------------------------------------------------------------------------
321
322
323// Helper used by both find_pc_desc methods.
324static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
325 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
326 if (!approximate)
327 return pc->pc_offset() == pc_offset;
328 else
329 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
330}
331
332void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
333 if (initial_pc_desc == NULL) {
334 _pc_descs[0] = NULL; // native method; no PcDescs at all
335 return;
336 }
337 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets);
338 // reset the cache by filling it with benign (non-null) values
339 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
340 for (int i = 0; i < cache_size; i++)
341 _pc_descs[i] = initial_pc_desc;
342}
343
344PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
345 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries);
346 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx);
347
348 // Note: one might think that caching the most recently
349 // read value separately would be a win, but one would be
350 // wrong. When many threads are updating it, the cache
351 // line it's in would bounce between caches, negating
352 // any benefit.
353
354 // In order to prevent race conditions do not load cache elements
355 // repeatedly, but use a local copy:
356 PcDesc* res;
357
358 // Step one: Check the most recently added value.
359 res = _pc_descs[0];
360 if (res == NULL) return NULL; // native method; no PcDescs at all
361 if (match_desc(res, pc_offset, approximate)) {
362 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
363 return res;
364 }
365
366 // Step two: Check the rest of the LRU cache.
367 for (int i = 1; i < cache_size; ++i) {
368 res = _pc_descs[i];
369 if (res->pc_offset() < 0) break; // optimization: skip empty cache
370 if (match_desc(res, pc_offset, approximate)) {
371 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
372 return res;
373 }
374 }
375
376 // Report failure.
377 return NULL;
378}
379
380void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
381 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
382 // Update the LRU cache by shifting pc_desc forward.
383 for (int i = 0; i < cache_size; i++) {
384 PcDesc* next = _pc_descs[i];
385 _pc_descs[i] = pc_desc;
386 pc_desc = next;
387 }
388}
389
390// adjust pcs_size so that it is a multiple of both oopSize and
391// sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
392// of oopSize, then 2*sizeof(PcDesc) is)
393static int adjust_pcs_size(int pcs_size) {
394 int nsize = align_up(pcs_size, oopSize);
395 if ((nsize % sizeof(PcDesc)) != 0) {
396 nsize = pcs_size + sizeof(PcDesc);
397 }
398 assert((nsize % oopSize) == 0, "correct alignment");
399 return nsize;
400}
401
402
403int nmethod::total_size() const {
404 return
405 consts_size() +
406 insts_size() +
407 stub_size() +
408 scopes_data_size() +
409 scopes_pcs_size() +
410 handler_table_size() +
411 nul_chk_table_size();
412}
413
414address* nmethod::orig_pc_addr(const frame* fr) {
415 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset);
416}
417
418const char* nmethod::compile_kind() const {
419 if (is_osr_method()) return "osr";
420 if (method() != NULL && is_native_method()) return "c2n";
421 return NULL;
422}
423
424// Fill in default values for various flag fields
425void nmethod::init_defaults() {
426 _state = not_installed;
427 _has_flushed_dependencies = 0;
428 _lock_count = 0;
429 _stack_traversal_mark = 0;
430 _unload_reported = false; // jvmti state
431 _is_far_code = false; // nmethods are located in CodeCache
432
433#ifdef ASSERT
434 _oops_are_stale = false;
435#endif
436
437 _oops_do_mark_link = NULL;
438 _jmethod_id = NULL;
439 _osr_link = NULL;
440#if INCLUDE_RTM_OPT
441 _rtm_state = NoRTM;
442#endif
443}
444
445nmethod* nmethod::new_native_nmethod(const methodHandle& method,
446 int compile_id,
447 CodeBuffer *code_buffer,
448 int vep_offset,
449 int frame_complete,
450 int frame_size,
451 ByteSize basic_lock_owner_sp_offset,
452 ByteSize basic_lock_sp_offset,
453 OopMapSet* oop_maps) {
454 code_buffer->finalize_oop_references(method);
455 // create nmethod
456 nmethod* nm = NULL;
457 {
458 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
459 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
460
461 CodeOffsets offsets;
462 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
463 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
464 nm = new (native_nmethod_size, CompLevel_none)
465 nmethod(method(), compiler_none, native_nmethod_size,
466 compile_id, &offsets,
467 code_buffer, frame_size,
468 basic_lock_owner_sp_offset,
469 basic_lock_sp_offset,
470 oop_maps);
471 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm));
472 }
473
474 if (nm != NULL) {
475 // verify nmethod
476 debug_only(nm->verify();) // might block
477
478 nm->log_new_nmethod();
479 nm->make_in_use();
480 }
481 return nm;
482}
483
484nmethod* nmethod::new_nmethod(const methodHandle& method,
485 int compile_id,
486 int entry_bci,
487 CodeOffsets* offsets,
488 int orig_pc_offset,
489 DebugInformationRecorder* debug_info,
490 Dependencies* dependencies,
491 CodeBuffer* code_buffer, int frame_size,
492 OopMapSet* oop_maps,
493 ExceptionHandlerTable* handler_table,
494 ImplicitExceptionTable* nul_chk_table,
495 AbstractCompiler* compiler,
496 int comp_level
497#if INCLUDE_JVMCI
498 , char* speculations,
499 int speculations_len,
500 int nmethod_mirror_index,
501 const char* nmethod_mirror_name,
502 FailedSpeculation** failed_speculations
503#endif
504)
505{
506 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
507 code_buffer->finalize_oop_references(method);
508 // create nmethod
509 nmethod* nm = NULL;
510 { MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
511#if INCLUDE_JVMCI
512 int jvmci_data_size = !compiler->is_jvmci() ? 0 : JVMCINMethodData::compute_size(nmethod_mirror_name);
513#endif
514 int nmethod_size =
515 CodeBlob::allocation_size(code_buffer, sizeof(nmethod))
516 + adjust_pcs_size(debug_info->pcs_size())
517 + align_up((int)dependencies->size_in_bytes(), oopSize)
518 + align_up(handler_table->size_in_bytes() , oopSize)
519 + align_up(nul_chk_table->size_in_bytes() , oopSize)
520#if INCLUDE_JVMCI
521 + align_up(speculations_len , oopSize)
522 + align_up(jvmci_data_size , oopSize)
523#endif
524 + align_up(debug_info->data_size() , oopSize);
525
526 nm = new (nmethod_size, comp_level)
527 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets,
528 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
529 oop_maps,
530 handler_table,
531 nul_chk_table,
532 compiler,
533 comp_level
534#if INCLUDE_JVMCI
535 , speculations,
536 speculations_len,
537 jvmci_data_size
538#endif
539 );
540
541 if (nm != NULL) {
542#if INCLUDE_JVMCI
543 if (compiler->is_jvmci()) {
544 // Initialize the JVMCINMethodData object inlined into nm
545 nm->jvmci_nmethod_data()->initialize(nmethod_mirror_index, nmethod_mirror_name, failed_speculations);
546 }
547#endif
548 // To make dependency checking during class loading fast, record
549 // the nmethod dependencies in the classes it is dependent on.
550 // This allows the dependency checking code to simply walk the
551 // class hierarchy above the loaded class, checking only nmethods
552 // which are dependent on those classes. The slow way is to
553 // check every nmethod for dependencies which makes it linear in
554 // the number of methods compiled. For applications with a lot
555 // classes the slow way is too slow.
556 for (Dependencies::DepStream deps(nm); deps.next(); ) {
557 if (deps.type() == Dependencies::call_site_target_value) {
558 // CallSite dependencies are managed on per-CallSite instance basis.
559 oop call_site = deps.argument_oop(0);
560 MethodHandles::add_dependent_nmethod(call_site, nm);
561 } else {
562 Klass* klass = deps.context_type();
563 if (klass == NULL) {
564 continue; // ignore things like evol_method
565 }
566 // record this nmethod as dependent on this klass
567 InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
568 }
569 }
570 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm));
571 }
572 }
573 // Do verification and logging outside CodeCache_lock.
574 if (nm != NULL) {
575 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
576 DEBUG_ONLY(nm->verify();)
577 nm->log_new_nmethod();
578 }
579 return nm;
580}
581
582// For native wrappers
583nmethod::nmethod(
584 Method* method,
585 CompilerType type,
586 int nmethod_size,
587 int compile_id,
588 CodeOffsets* offsets,
589 CodeBuffer* code_buffer,
590 int frame_size,
591 ByteSize basic_lock_owner_sp_offset,
592 ByteSize basic_lock_sp_offset,
593 OopMapSet* oop_maps )
594 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
595 _is_unloading_state(0),
596 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
597 _native_basic_lock_sp_offset(basic_lock_sp_offset)
598{
599 {
600 int scopes_data_offset = 0;
601 int deoptimize_offset = 0;
602 int deoptimize_mh_offset = 0;
603
604 debug_only(NoSafepointVerifier nsv;)
605 assert_locked_or_safepoint(CodeCache_lock);
606
607 init_defaults();
608 _entry_bci = InvocationEntryBci;
609 // We have no exception handler or deopt handler make the
610 // values something that will never match a pc like the nmethod vtable entry
611 _exception_offset = 0;
612 _orig_pc_offset = 0;
613
614 _consts_offset = data_offset();
615 _stub_offset = data_offset();
616 _oops_offset = data_offset();
617 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
618 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
619 _scopes_pcs_offset = scopes_data_offset;
620 _dependencies_offset = _scopes_pcs_offset;
621 _handler_table_offset = _dependencies_offset;
622 _nul_chk_table_offset = _handler_table_offset;
623#if INCLUDE_JVMCI
624 _speculations_offset = _nul_chk_table_offset;
625 _jvmci_data_offset = _speculations_offset;
626 _nmethod_end_offset = _jvmci_data_offset;
627#else
628 _nmethod_end_offset = _nul_chk_table_offset;
629#endif
630 _compile_id = compile_id;
631 _comp_level = CompLevel_none;
632 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
633 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
634 _osr_entry_point = NULL;
635 _exception_cache = NULL;
636 _pc_desc_container.reset_to(NULL);
637 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
638
639 _scopes_data_begin = (address) this + scopes_data_offset;
640 _deopt_handler_begin = (address) this + deoptimize_offset;
641 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset;
642
643 code_buffer->copy_code_and_locs_to(this);
644 code_buffer->copy_values_to(this);
645
646 clear_unloading_state();
647
648 Universe::heap()->register_nmethod(this);
649 debug_only(Universe::heap()->verify_nmethod(this));
650
651 CodeCache::commit(this);
652 }
653
654 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
655 ttyLocker ttyl; // keep the following output all in one block
656 // This output goes directly to the tty, not the compiler log.
657 // To enable tools to match it up with the compilation activity,
658 // be sure to tag this tty output with the compile ID.
659 if (xtty != NULL) {
660 xtty->begin_head("print_native_nmethod");
661 xtty->method(_method);
662 xtty->stamp();
663 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
664 }
665 // Print the header part, then print the requested information.
666 // This is both handled in decode2(), called via print_code() -> decode()
667 if (PrintNativeNMethods) {
668 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
669 print_code();
670 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
671#if defined(SUPPORT_DATA_STRUCTS)
672 if (AbstractDisassembler::show_structs()) {
673 if (oop_maps != NULL) {
674 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
675 oop_maps->print_on(tty);
676 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
677 }
678 }
679#endif
680 } else {
681 print(); // print the header part only.
682 }
683#if defined(SUPPORT_DATA_STRUCTS)
684 if (AbstractDisassembler::show_structs()) {
685 if (PrintRelocations) {
686 print_relocations();
687 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
688 }
689 }
690#endif
691 if (xtty != NULL) {
692 xtty->tail("print_native_nmethod");
693 }
694 }
695}
696
697void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
698 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
699}
700
701nmethod::nmethod(
702 Method* method,
703 CompilerType type,
704 int nmethod_size,
705 int compile_id,
706 int entry_bci,
707 CodeOffsets* offsets,
708 int orig_pc_offset,
709 DebugInformationRecorder* debug_info,
710 Dependencies* dependencies,
711 CodeBuffer *code_buffer,
712 int frame_size,
713 OopMapSet* oop_maps,
714 ExceptionHandlerTable* handler_table,
715 ImplicitExceptionTable* nul_chk_table,
716 AbstractCompiler* compiler,
717 int comp_level
718#if INCLUDE_JVMCI
719 , char* speculations,
720 int speculations_len,
721 int jvmci_data_size
722#endif
723 )
724 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
725 _is_unloading_state(0),
726 _native_receiver_sp_offset(in_ByteSize(-1)),
727 _native_basic_lock_sp_offset(in_ByteSize(-1))
728{
729 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
730 {
731 debug_only(NoSafepointVerifier nsv;)
732 assert_locked_or_safepoint(CodeCache_lock);
733
734 _deopt_handler_begin = (address) this;
735 _deopt_mh_handler_begin = (address) this;
736
737 init_defaults();
738 _entry_bci = entry_bci;
739 _compile_id = compile_id;
740 _comp_level = comp_level;
741 _orig_pc_offset = orig_pc_offset;
742 _hotness_counter = NMethodSweeper::hotness_counter_reset_val();
743
744 // Section offsets
745 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts());
746 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
747 set_ctable_begin(header_begin() + _consts_offset);
748
749#if INCLUDE_JVMCI
750 if (compiler->is_jvmci()) {
751 // JVMCI might not produce any stub sections
752 if (offsets->value(CodeOffsets::Exceptions) != -1) {
753 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
754 } else {
755 _exception_offset = -1;
756 }
757 if (offsets->value(CodeOffsets::Deopt) != -1) {
758 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt);
759 } else {
760 _deopt_handler_begin = NULL;
761 }
762 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
763 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH);
764 } else {
765 _deopt_mh_handler_begin = NULL;
766 }
767 } else
768#endif
769 {
770 // Exception handler and deopt handler are in the stub section
771 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
772 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
773
774 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
775 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt);
776 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
777 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH);
778 } else {
779 _deopt_mh_handler_begin = NULL;
780 }
781 }
782 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
783 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
784 } else {
785 _unwind_handler_offset = -1;
786 }
787
788 _oops_offset = data_offset();
789 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize);
790 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize);
791
792 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize);
793 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
794 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize);
795 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
796#if INCLUDE_JVMCI
797 _speculations_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
798 _jvmci_data_offset = _speculations_offset + align_up(speculations_len, oopSize);
799 _nmethod_end_offset = _jvmci_data_offset + align_up(jvmci_data_size, oopSize);
800#else
801 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize);
802#endif
803 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry);
804 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry);
805 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
806 _exception_cache = NULL;
807 _scopes_data_begin = (address) this + scopes_data_offset;
808
809 _pc_desc_container.reset_to(scopes_pcs_begin());
810
811 code_buffer->copy_code_and_locs_to(this);
812 // Copy contents of ScopeDescRecorder to nmethod
813 code_buffer->copy_values_to(this);
814 debug_info->copy_to(this);
815 dependencies->copy_to(this);
816 clear_unloading_state();
817
818 Universe::heap()->register_nmethod(this);
819 debug_only(Universe::heap()->verify_nmethod(this));
820
821 CodeCache::commit(this);
822
823 // Copy contents of ExceptionHandlerTable to nmethod
824 handler_table->copy_to(this);
825 nul_chk_table->copy_to(this);
826
827#if INCLUDE_JVMCI
828 // Copy speculations to nmethod
829 if (speculations_size() != 0) {
830 memcpy(speculations_begin(), speculations, speculations_len);
831 }
832#endif
833
834 // we use the information of entry points to find out if a method is
835 // static or non static
836 assert(compiler->is_c2() || compiler->is_jvmci() ||
837 _method->is_static() == (entry_point() == _verified_entry_point),
838 " entry points must be same for static methods and vice versa");
839 }
840}
841
842// Print a short set of xml attributes to identify this nmethod. The
843// output should be embedded in some other element.
844void nmethod::log_identity(xmlStream* log) const {
845 log->print(" compile_id='%d'", compile_id());
846 const char* nm_kind = compile_kind();
847 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind);
848 log->print(" compiler='%s'", compiler_name());
849 if (TieredCompilation) {
850 log->print(" level='%d'", comp_level());
851 }
852#if INCLUDE_JVMCI
853 if (jvmci_nmethod_data() != NULL) {
854 const char* jvmci_name = jvmci_nmethod_data()->name();
855 if (jvmci_name != NULL) {
856 log->print(" jvmci_mirror_name='");
857 log->text("%s", jvmci_name);
858 log->print("'");
859 }
860 }
861#endif
862}
863
864
865#define LOG_OFFSET(log, name) \
866 if (p2i(name##_end()) - p2i(name##_begin())) \
867 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \
868 p2i(name##_begin()) - p2i(this))
869
870
871void nmethod::log_new_nmethod() const {
872 if (LogCompilation && xtty != NULL) {
873 ttyLocker ttyl;
874 HandleMark hm;
875 xtty->begin_elem("nmethod");
876 log_identity(xtty);
877 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
878 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
879
880 LOG_OFFSET(xtty, relocation);
881 LOG_OFFSET(xtty, consts);
882 LOG_OFFSET(xtty, insts);
883 LOG_OFFSET(xtty, stub);
884 LOG_OFFSET(xtty, scopes_data);
885 LOG_OFFSET(xtty, scopes_pcs);
886 LOG_OFFSET(xtty, dependencies);
887 LOG_OFFSET(xtty, handler_table);
888 LOG_OFFSET(xtty, nul_chk_table);
889 LOG_OFFSET(xtty, oops);
890 LOG_OFFSET(xtty, metadata);
891
892 xtty->method(method());
893 xtty->stamp();
894 xtty->end_elem();
895 }
896}
897
898#undef LOG_OFFSET
899
900
901// Print out more verbose output usually for a newly created nmethod.
902void nmethod::print_on(outputStream* st, const char* msg) const {
903 if (st != NULL) {
904 ttyLocker ttyl;
905 if (WizardMode) {
906 CompileTask::print(st, this, msg, /*short_form:*/ true);
907 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
908 } else {
909 CompileTask::print(st, this, msg, /*short_form:*/ false);
910 }
911 }
912}
913
914void nmethod::maybe_print_nmethod(DirectiveSet* directive) {
915 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
916 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
917 print_nmethod(printnmethods);
918 }
919}
920
921void nmethod::print_nmethod(bool printmethod) {
922 ttyLocker ttyl; // keep the following output all in one block
923 if (xtty != NULL) {
924 xtty->begin_head("print_nmethod");
925 log_identity(xtty);
926 xtty->stamp();
927 xtty->end_head();
928 }
929 // Print the header part, then print the requested information.
930 // This is both handled in decode2().
931 if (printmethod) {
932 HandleMark hm;
933 ResourceMark m;
934 if (is_compiled_by_c1()) {
935 tty->cr();
936 tty->print_cr("============================= C1-compiled nmethod ==============================");
937 }
938 if (is_compiled_by_jvmci()) {
939 tty->cr();
940 tty->print_cr("=========================== JVMCI-compiled nmethod =============================");
941 }
942 tty->print_cr("----------------------------------- Assembly -----------------------------------");
943 decode2(tty);
944#if defined(SUPPORT_DATA_STRUCTS)
945 if (AbstractDisassembler::show_structs()) {
946 // Print the oops from the underlying CodeBlob as well.
947 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
948 print_oops(tty);
949 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
950 print_metadata(tty);
951 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
952 print_pcs();
953 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
954 if (oop_maps() != NULL) {
955 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
956 oop_maps()->print_on(tty);
957 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
958 }
959 }
960#endif
961 } else {
962 print(); // print the header part only.
963 }
964
965#if defined(SUPPORT_DATA_STRUCTS)
966 if (AbstractDisassembler::show_structs()) {
967 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) {
968 print_scopes();
969 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
970 }
971 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) {
972 print_relocations();
973 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
974 }
975 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) {
976 print_dependencies();
977 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
978 }
979 if (printmethod || PrintExceptionHandlers) {
980 print_handler_table();
981 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
982 print_nul_chk_table();
983 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
984 }
985
986 if (printmethod) {
987 print_recorded_oops();
988 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
989 print_recorded_metadata();
990 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
991 }
992 }
993#endif
994
995 if (xtty != NULL) {
996 xtty->tail("print_nmethod");
997 }
998}
999
1000
1001// Promote one word from an assembly-time handle to a live embedded oop.
1002inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1003 if (handle == NULL ||
1004 // As a special case, IC oops are initialized to 1 or -1.
1005 handle == (jobject) Universe::non_oop_word()) {
1006 (*dest) = (oop) handle;
1007 } else {
1008 (*dest) = JNIHandles::resolve_non_null(handle);
1009 }
1010}
1011
1012
1013// Have to have the same name because it's called by a template
1014void nmethod::copy_values(GrowableArray<jobject>* array) {
1015 int length = array->length();
1016 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1017 oop* dest = oops_begin();
1018 for (int index = 0 ; index < length; index++) {
1019 initialize_immediate_oop(&dest[index], array->at(index));
1020 }
1021
1022 // Now we can fix up all the oops in the code. We need to do this
1023 // in the code because the assembler uses jobjects as placeholders.
1024 // The code and relocations have already been initialized by the
1025 // CodeBlob constructor, so it is valid even at this early point to
1026 // iterate over relocations and patch the code.
1027 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
1028}
1029
1030void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1031 int length = array->length();
1032 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1033 Metadata** dest = metadata_begin();
1034 for (int index = 0 ; index < length; index++) {
1035 dest[index] = array->at(index);
1036 }
1037}
1038
1039void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1040 // re-patch all oop-bearing instructions, just in case some oops moved
1041 RelocIterator iter(this, begin, end);
1042 while (iter.next()) {
1043 if (iter.type() == relocInfo::oop_type) {
1044 oop_Relocation* reloc = iter.oop_reloc();
1045 if (initialize_immediates && reloc->oop_is_immediate()) {
1046 oop* dest = reloc->oop_addr();
1047 initialize_immediate_oop(dest, (jobject) *dest);
1048 }
1049 // Refresh the oop-related bits of this instruction.
1050 reloc->fix_oop_relocation();
1051 } else if (iter.type() == relocInfo::metadata_type) {
1052 metadata_Relocation* reloc = iter.metadata_reloc();
1053 reloc->fix_metadata_relocation();
1054 }
1055 }
1056}
1057
1058
1059void nmethod::verify_clean_inline_caches() {
1060 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1061
1062 ResourceMark rm;
1063 RelocIterator iter(this, oops_reloc_begin());
1064 while(iter.next()) {
1065 switch(iter.type()) {
1066 case relocInfo::virtual_call_type:
1067 case relocInfo::opt_virtual_call_type: {
1068 CompiledIC *ic = CompiledIC_at(&iter);
1069 // Ok, to lookup references to zombies here
1070 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
1071 assert(cb != NULL, "destination not in CodeBlob?");
1072 nmethod* nm = cb->as_nmethod_or_null();
1073 if( nm != NULL ) {
1074 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1075 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1076 assert(ic->is_clean(), "IC should be clean");
1077 }
1078 }
1079 break;
1080 }
1081 case relocInfo::static_call_type: {
1082 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
1083 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
1084 assert(cb != NULL, "destination not in CodeBlob?");
1085 nmethod* nm = cb->as_nmethod_or_null();
1086 if( nm != NULL ) {
1087 // Verify that inline caches pointing to both zombie and not_entrant methods are clean
1088 if (!nm->is_in_use() || (nm->method()->code() != nm)) {
1089 assert(csc->is_clean(), "IC should be clean");
1090 }
1091 }
1092 break;
1093 }
1094 default:
1095 break;
1096 }
1097 }
1098}
1099
1100// This is a private interface with the sweeper.
1101void nmethod::mark_as_seen_on_stack() {
1102 assert(is_alive(), "Must be an alive method");
1103 // Set the traversal mark to ensure that the sweeper does 2
1104 // cleaning passes before moving to zombie.
1105 set_stack_traversal_mark(NMethodSweeper::traversal_count());
1106}
1107
1108// Tell if a non-entrant method can be converted to a zombie (i.e.,
1109// there are no activations on the stack, not in use by the VM,
1110// and not in use by the ServiceThread)
1111bool nmethod::can_convert_to_zombie() {
1112 // Note that this is called when the sweeper has observed the nmethod to be
1113 // not_entrant. However, with concurrent code cache unloading, the state
1114 // might have moved on to unloaded if it is_unloading(), due to racing
1115 // concurrent GC threads.
1116 assert(is_not_entrant() || is_unloading(), "must be a non-entrant method");
1117
1118 // Since the nmethod sweeper only does partial sweep the sweeper's traversal
1119 // count can be greater than the stack traversal count before it hits the
1120 // nmethod for the second time.
1121 // If an is_unloading() nmethod is still not_entrant, then it is not safe to
1122 // convert it to zombie due to GC unloading interactions. However, if it
1123 // has become unloaded, then it is okay to convert such nmethods to zombie.
1124 return stack_traversal_mark() + 1 < NMethodSweeper::traversal_count() &&
1125 !is_locked_by_vm() && (!is_unloading() || is_unloaded());
1126}
1127
1128void nmethod::inc_decompile_count() {
1129 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
1130 // Could be gated by ProfileTraps, but do not bother...
1131 Method* m = method();
1132 if (m == NULL) return;
1133 MethodData* mdo = m->method_data();
1134 if (mdo == NULL) return;
1135 // There is a benign race here. See comments in methodData.hpp.
1136 mdo->inc_decompile_count();
1137}
1138
1139void nmethod::make_unloaded() {
1140 post_compiled_method_unload();
1141
1142 // This nmethod is being unloaded, make sure that dependencies
1143 // recorded in instanceKlasses get flushed.
1144 // Since this work is being done during a GC, defer deleting dependencies from the
1145 // InstanceKlass.
1146 assert(Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread(),
1147 "should only be called during gc");
1148 flush_dependencies(/*delete_immediately*/false);
1149
1150 // Break cycle between nmethod & method
1151 LogTarget(Trace, class, unload, nmethod) lt;
1152 if (lt.is_enabled()) {
1153 LogStream ls(lt);
1154 ls.print("making nmethod " INTPTR_FORMAT
1155 " unloadable, Method*(" INTPTR_FORMAT
1156 ") ",
1157 p2i(this), p2i(_method));
1158 ls.cr();
1159 }
1160 // Unlink the osr method, so we do not look this up again
1161 if (is_osr_method()) {
1162 // Invalidate the osr nmethod only once
1163 if (is_in_use()) {
1164 invalidate_osr_method();
1165 }
1166#ifdef ASSERT
1167 if (method() != NULL) {
1168 // Make sure osr nmethod is invalidated, i.e. not on the list
1169 bool found = method()->method_holder()->remove_osr_nmethod(this);
1170 assert(!found, "osr nmethod should have been invalidated");
1171 }
1172#endif
1173 }
1174
1175 // If _method is already NULL the Method* is about to be unloaded,
1176 // so we don't have to break the cycle. Note that it is possible to
1177 // have the Method* live here, in case we unload the nmethod because
1178 // it is pointing to some oop (other than the Method*) being unloaded.
1179 if (_method != NULL) {
1180 // OSR methods point to the Method*, but the Method* does not
1181 // point back!
1182 if (_method->code() == this) {
1183 _method->clear_code(); // Break a cycle
1184 }
1185 }
1186
1187 // Make the class unloaded - i.e., change state and notify sweeper
1188 assert(SafepointSynchronize::is_at_safepoint() || Thread::current()->is_ConcurrentGC_thread(),
1189 "must be at safepoint");
1190
1191 {
1192 // Clear ICStubs and release any CompiledICHolders.
1193 CompiledICLocker ml(this);
1194 clear_ic_callsites();
1195 }
1196
1197 // Unregister must be done before the state change
1198 {
1199 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : CodeCache_lock,
1200 Mutex::_no_safepoint_check_flag);
1201 Universe::heap()->unregister_nmethod(this);
1202 }
1203
1204 // Clear the method of this dead nmethod
1205 set_method(NULL);
1206
1207 // Log the unloading.
1208 log_state_change();
1209
1210 // The Method* is gone at this point
1211 assert(_method == NULL, "Tautology");
1212
1213 set_osr_link(NULL);
1214 NMethodSweeper::report_state_change(this);
1215
1216 // The release is only needed for compile-time ordering, as accesses
1217 // into the nmethod after the store are not safe due to the sweeper
1218 // being allowed to free it when the store is observed, during
1219 // concurrent nmethod unloading. Therefore, there is no need for
1220 // acquire on the loader side.
1221 OrderAccess::release_store(&_state, (signed char)unloaded);
1222
1223#if INCLUDE_JVMCI
1224 // Clear the link between this nmethod and a HotSpotNmethod mirror
1225 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1226 if (nmethod_data != NULL) {
1227 nmethod_data->invalidate_nmethod_mirror(this);
1228 nmethod_data->clear_nmethod_mirror(this);
1229 }
1230#endif
1231}
1232
1233void nmethod::invalidate_osr_method() {
1234 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
1235 // Remove from list of active nmethods
1236 if (method() != NULL) {
1237 method()->method_holder()->remove_osr_nmethod(this);
1238 }
1239}
1240
1241void nmethod::log_state_change() const {
1242 if (LogCompilation) {
1243 if (xtty != NULL) {
1244 ttyLocker ttyl; // keep the following output all in one block
1245 if (_state == unloaded) {
1246 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
1247 os::current_thread_id());
1248 } else {
1249 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
1250 os::current_thread_id(),
1251 (_state == zombie ? " zombie='1'" : ""));
1252 }
1253 log_identity(xtty);
1254 xtty->stamp();
1255 xtty->end_elem();
1256 }
1257 }
1258
1259 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant";
1260 CompileTask::print_ul(this, state_msg);
1261 if (PrintCompilation && _state != unloaded) {
1262 print_on(tty, state_msg);
1263 }
1264}
1265
1266void nmethod::unlink_from_method(bool acquire_lock) {
1267 // We need to check if both the _code and _from_compiled_code_entry_point
1268 // refer to this nmethod because there is a race in setting these two fields
1269 // in Method* as seen in bugid 4947125.
1270 // If the vep() points to the zombie nmethod, the memory for the nmethod
1271 // could be flushed and the compiler and vtable stubs could still call
1272 // through it.
1273 if (method() != NULL && (method()->code() == this ||
1274 method()->from_compiled_entry() == verified_entry_point())) {
1275 method()->clear_code(acquire_lock);
1276 }
1277}
1278
1279/**
1280 * Common functionality for both make_not_entrant and make_zombie
1281 */
1282bool nmethod::make_not_entrant_or_zombie(int state) {
1283 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1284 assert(!is_zombie(), "should not already be a zombie");
1285
1286 if (_state == state) {
1287 // Avoid taking the lock if already in required state.
1288 // This is safe from races because the state is an end-state,
1289 // which the nmethod cannot back out of once entered.
1290 // No need for fencing either.
1291 return false;
1292 }
1293
1294 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
1295 nmethodLocker nml(this);
1296 methodHandle the_method(method());
1297 // This can be called while the system is already at a safepoint which is ok
1298 NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint());
1299
1300 // during patching, depending on the nmethod state we must notify the GC that
1301 // code has been unloaded, unregistering it. We cannot do this right while
1302 // holding the Patching_lock because we need to use the CodeCache_lock. This
1303 // would be prone to deadlocks.
1304 // This flag is used to remember whether we need to later lock and unregister.
1305 bool nmethod_needs_unregister = false;
1306
1307 {
1308 // invalidate osr nmethod before acquiring the patching lock since
1309 // they both acquire leaf locks and we don't want a deadlock.
1310 // This logic is equivalent to the logic below for patching the
1311 // verified entry point of regular methods. We check that the
1312 // nmethod is in use to ensure that it is invalidated only once.
1313 if (is_osr_method() && is_in_use()) {
1314 // this effectively makes the osr nmethod not entrant
1315 invalidate_osr_method();
1316 }
1317
1318 // Enter critical section. Does not block for safepoint.
1319 MutexLocker pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1320
1321 if (_state == state) {
1322 // another thread already performed this transition so nothing
1323 // to do, but return false to indicate this.
1324 return false;
1325 }
1326
1327 // The caller can be calling the method statically or through an inline
1328 // cache call.
1329 if (!is_osr_method() && !is_not_entrant()) {
1330 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
1331 SharedRuntime::get_handle_wrong_method_stub());
1332 }
1333
1334 if (is_in_use() && update_recompile_counts()) {
1335 // It's a true state change, so mark the method as decompiled.
1336 // Do it only for transition from alive.
1337 inc_decompile_count();
1338 }
1339
1340 // If the state is becoming a zombie, signal to unregister the nmethod with
1341 // the heap.
1342 // This nmethod may have already been unloaded during a full GC.
1343 if ((state == zombie) && !is_unloaded()) {
1344 nmethod_needs_unregister = true;
1345 }
1346
1347 // Must happen before state change. Otherwise we have a race condition in
1348 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
1349 // transition its state from 'not_entrant' to 'zombie' without having to wait
1350 // for stack scanning.
1351 if (state == not_entrant) {
1352 mark_as_seen_on_stack();
1353 OrderAccess::storestore(); // _stack_traversal_mark and _state
1354 }
1355
1356 // Change state
1357 _state = state;
1358
1359 // Log the transition once
1360 log_state_change();
1361
1362 // Remove nmethod from method.
1363 unlink_from_method(false /* already owns Patching_lock */);
1364 } // leave critical region under Patching_lock
1365
1366#if INCLUDE_JVMCI
1367 // Invalidate can't occur while holding the Patching lock
1368 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
1369 if (nmethod_data != NULL) {
1370 nmethod_data->invalidate_nmethod_mirror(this);
1371 }
1372#endif
1373
1374#ifdef ASSERT
1375 if (is_osr_method() && method() != NULL) {
1376 // Make sure osr nmethod is invalidated, i.e. not on the list
1377 bool found = method()->method_holder()->remove_osr_nmethod(this);
1378 assert(!found, "osr nmethod should have been invalidated");
1379 }
1380#endif
1381
1382 // When the nmethod becomes zombie it is no longer alive so the
1383 // dependencies must be flushed. nmethods in the not_entrant
1384 // state will be flushed later when the transition to zombie
1385 // happens or they get unloaded.
1386 if (state == zombie) {
1387 {
1388 // Flushing dependencies must be done before any possible
1389 // safepoint can sneak in, otherwise the oops used by the
1390 // dependency logic could have become stale.
1391 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1392 if (nmethod_needs_unregister) {
1393 Universe::heap()->unregister_nmethod(this);
1394 }
1395 flush_dependencies(/*delete_immediately*/true);
1396 }
1397
1398#if INCLUDE_JVMCI
1399 // Now that the nmethod has been unregistered, it's
1400 // safe to clear the HotSpotNmethod mirror oop.
1401 if (nmethod_data != NULL) {
1402 nmethod_data->clear_nmethod_mirror(this);
1403 }
1404#endif
1405
1406 // Clear ICStubs to prevent back patching stubs of zombie or flushed
1407 // nmethods during the next safepoint (see ICStub::finalize), as well
1408 // as to free up CompiledICHolder resources.
1409 {
1410 CompiledICLocker ml(this);
1411 clear_ic_callsites();
1412 }
1413
1414 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
1415 // event and it hasn't already been reported for this nmethod then
1416 // report it now. The event may have been reported earlier if the GC
1417 // marked it for unloading). JvmtiDeferredEventQueue support means
1418 // we no longer go to a safepoint here.
1419 post_compiled_method_unload();
1420
1421#ifdef ASSERT
1422 // It's no longer safe to access the oops section since zombie
1423 // nmethods aren't scanned for GC.
1424 _oops_are_stale = true;
1425#endif
1426 // the Method may be reclaimed by class unloading now that the
1427 // nmethod is in zombie state
1428 set_method(NULL);
1429 } else {
1430 assert(state == not_entrant, "other cases may need to be handled differently");
1431 }
1432
1433 if (TraceCreateZombies && state == zombie) {
1434 ResourceMark m;
1435 tty->print_cr("nmethod <" INTPTR_FORMAT "> %s code made %s", p2i(this), this->method() ? this->method()->name_and_sig_as_C_string() : "null", (state == not_entrant) ? "not entrant" : "zombie");
1436 }
1437
1438 NMethodSweeper::report_state_change(this);
1439 return true;
1440}
1441
1442void nmethod::flush() {
1443 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1444 // Note that there are no valid oops in the nmethod anymore.
1445 assert(!is_osr_method() || is_unloaded() || is_zombie(),
1446 "osr nmethod must be unloaded or zombie before flushing");
1447 assert(is_zombie() || is_osr_method(), "must be a zombie method");
1448 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1449 assert_locked_or_safepoint(CodeCache_lock);
1450
1451 // completely deallocate this method
1452 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this));
1453 if (PrintMethodFlushing) {
1454 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
1455 "/Free CodeCache:" SIZE_FORMAT "Kb",
1456 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
1457 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
1458 }
1459
1460 // We need to deallocate any ExceptionCache data.
1461 // Note that we do not need to grab the nmethod lock for this, it
1462 // better be thread safe if we're disposing of it!
1463 ExceptionCache* ec = exception_cache();
1464 set_exception_cache(NULL);
1465 while(ec != NULL) {
1466 ExceptionCache* next = ec->next();
1467 delete ec;
1468 ec = next;
1469 }
1470
1471 Universe::heap()->flush_nmethod(this);
1472 CodeCache::unregister_old_nmethod(this);
1473
1474 CodeBlob::flush();
1475 CodeCache::free(this);
1476}
1477
1478oop nmethod::oop_at(int index) const {
1479 if (index == 0) {
1480 return NULL;
1481 }
1482 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index));
1483}
1484
1485oop nmethod::oop_at_phantom(int index) const {
1486 if (index == 0) {
1487 return NULL;
1488 }
1489 return NativeAccess<ON_PHANTOM_OOP_REF>::oop_load(oop_addr_at(index));
1490}
1491
1492//
1493// Notify all classes this nmethod is dependent on that it is no
1494// longer dependent. This should only be called in two situations.
1495// First, when a nmethod transitions to a zombie all dependents need
1496// to be clear. Since zombification happens at a safepoint there's no
1497// synchronization issues. The second place is a little more tricky.
1498// During phase 1 of mark sweep class unloading may happen and as a
1499// result some nmethods may get unloaded. In this case the flushing
1500// of dependencies must happen during phase 1 since after GC any
1501// dependencies in the unloaded nmethod won't be updated, so
1502// traversing the dependency information in unsafe. In that case this
1503// function is called with a boolean argument and this function only
1504// notifies instanceKlasses that are reachable
1505
1506void nmethod::flush_dependencies(bool delete_immediately) {
1507 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread();)
1508 assert(called_by_gc != delete_immediately,
1509 "delete_immediately is false if and only if we are called during GC");
1510 if (!has_flushed_dependencies()) {
1511 set_has_flushed_dependencies();
1512 for (Dependencies::DepStream deps(this); deps.next(); ) {
1513 if (deps.type() == Dependencies::call_site_target_value) {
1514 // CallSite dependencies are managed on per-CallSite instance basis.
1515 oop call_site = deps.argument_oop(0);
1516 if (delete_immediately) {
1517 assert_locked_or_safepoint(CodeCache_lock);
1518 MethodHandles::remove_dependent_nmethod(call_site, this);
1519 } else {
1520 MethodHandles::clean_dependency_context(call_site);
1521 }
1522 } else {
1523 Klass* klass = deps.context_type();
1524 if (klass == NULL) {
1525 continue; // ignore things like evol_method
1526 }
1527 // During GC delete_immediately is false, and liveness
1528 // of dependee determines class that needs to be updated.
1529 if (delete_immediately) {
1530 assert_locked_or_safepoint(CodeCache_lock);
1531 InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
1532 } else if (klass->is_loader_alive()) {
1533 // The GC may clean dependency contexts concurrently and in parallel.
1534 InstanceKlass::cast(klass)->clean_dependency_context();
1535 }
1536 }
1537 }
1538 }
1539}
1540
1541// ------------------------------------------------------------------
1542// post_compiled_method_load_event
1543// new method for install_code() path
1544// Transfer information from compilation to jvmti
1545void nmethod::post_compiled_method_load_event() {
1546
1547 Method* moop = method();
1548 HOTSPOT_COMPILED_METHOD_LOAD(
1549 (char *) moop->klass_name()->bytes(),
1550 moop->klass_name()->utf8_length(),
1551 (char *) moop->name()->bytes(),
1552 moop->name()->utf8_length(),
1553 (char *) moop->signature()->bytes(),
1554 moop->signature()->utf8_length(),
1555 insts_begin(), insts_size());
1556
1557 if (JvmtiExport::should_post_compiled_method_load() ||
1558 JvmtiExport::should_post_compiled_method_unload()) {
1559 get_and_cache_jmethod_id();
1560 }
1561
1562 if (JvmtiExport::should_post_compiled_method_load()) {
1563 // Let the Service thread (which is a real Java thread) post the event
1564 MutexLocker ml(Service_lock, Mutex::_no_safepoint_check_flag);
1565 JvmtiDeferredEventQueue::enqueue(
1566 JvmtiDeferredEvent::compiled_method_load_event(this));
1567 }
1568}
1569
1570jmethodID nmethod::get_and_cache_jmethod_id() {
1571 if (_jmethod_id == NULL) {
1572 // Cache the jmethod_id since it can no longer be looked up once the
1573 // method itself has been marked for unloading.
1574 _jmethod_id = method()->jmethod_id();
1575 }
1576 return _jmethod_id;
1577}
1578
1579void nmethod::post_compiled_method_unload() {
1580 if (unload_reported()) {
1581 // During unloading we transition to unloaded and then to zombie
1582 // and the unloading is reported during the first transition.
1583 return;
1584 }
1585
1586 assert(_method != NULL && !is_unloaded(), "just checking");
1587 DTRACE_METHOD_UNLOAD_PROBE(method());
1588
1589 // If a JVMTI agent has enabled the CompiledMethodUnload event then
1590 // post the event. Sometime later this nmethod will be made a zombie
1591 // by the sweeper but the Method* will not be valid at that point.
1592 // If the _jmethod_id is null then no load event was ever requested
1593 // so don't bother posting the unload. The main reason for this is
1594 // that the jmethodID is a weak reference to the Method* so if
1595 // it's being unloaded there's no way to look it up since the weak
1596 // ref will have been cleared.
1597 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
1598 assert(!unload_reported(), "already unloaded");
1599 JvmtiDeferredEvent event =
1600 JvmtiDeferredEvent::compiled_method_unload_event(this,
1601 _jmethod_id, insts_begin());
1602 MutexLocker ml(Service_lock, Mutex::_no_safepoint_check_flag);
1603 JvmtiDeferredEventQueue::enqueue(event);
1604 }
1605
1606 // The JVMTI CompiledMethodUnload event can be enabled or disabled at
1607 // any time. As the nmethod is being unloaded now we mark it has
1608 // having the unload event reported - this will ensure that we don't
1609 // attempt to report the event in the unlikely scenario where the
1610 // event is enabled at the time the nmethod is made a zombie.
1611 set_unload_reported();
1612}
1613
1614// Iterate over metadata calling this function. Used by RedefineClasses
1615void nmethod::metadata_do(MetadataClosure* f) {
1616 {
1617 // Visit all immediate references that are embedded in the instruction stream.
1618 RelocIterator iter(this, oops_reloc_begin());
1619 while (iter.next()) {
1620 if (iter.type() == relocInfo::metadata_type) {
1621 metadata_Relocation* r = iter.metadata_reloc();
1622 // In this metadata, we must only follow those metadatas directly embedded in
1623 // the code. Other metadatas (oop_index>0) are seen as part of
1624 // the metadata section below.
1625 assert(1 == (r->metadata_is_immediate()) +
1626 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
1627 "metadata must be found in exactly one place");
1628 if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
1629 Metadata* md = r->metadata_value();
1630 if (md != _method) f->do_metadata(md);
1631 }
1632 } else if (iter.type() == relocInfo::virtual_call_type) {
1633 // Check compiledIC holders associated with this nmethod
1634 ResourceMark rm;
1635 CompiledIC *ic = CompiledIC_at(&iter);
1636 if (ic->is_icholder_call()) {
1637 CompiledICHolder* cichk = ic->cached_icholder();
1638 f->do_metadata(cichk->holder_metadata());
1639 f->do_metadata(cichk->holder_klass());
1640 } else {
1641 Metadata* ic_oop = ic->cached_metadata();
1642 if (ic_oop != NULL) {
1643 f->do_metadata(ic_oop);
1644 }
1645 }
1646 }
1647 }
1648 }
1649
1650 // Visit the metadata section
1651 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
1652 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops
1653 Metadata* md = *p;
1654 f->do_metadata(md);
1655 }
1656
1657 // Visit metadata not embedded in the other places.
1658 if (_method != NULL) f->do_metadata(_method);
1659}
1660
1661// The _is_unloading_state encodes a tuple comprising the unloading cycle
1662// and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle.
1663// This is the bit layout of the _is_unloading_state byte: 00000CCU
1664// CC refers to the cycle, which has 2 bits, and U refers to the result of
1665// IsUnloadingBehaviour::is_unloading() for that unloading cycle.
1666
1667class IsUnloadingState: public AllStatic {
1668 static const uint8_t _is_unloading_mask = 1;
1669 static const uint8_t _is_unloading_shift = 0;
1670 static const uint8_t _unloading_cycle_mask = 6;
1671 static const uint8_t _unloading_cycle_shift = 1;
1672
1673 static uint8_t set_is_unloading(uint8_t state, bool value) {
1674 state &= ~_is_unloading_mask;
1675 if (value) {
1676 state |= 1 << _is_unloading_shift;
1677 }
1678 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
1679 return state;
1680 }
1681
1682 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
1683 state &= ~_unloading_cycle_mask;
1684 state |= value << _unloading_cycle_shift;
1685 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
1686 return state;
1687 }
1688
1689public:
1690 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
1691 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
1692
1693 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
1694 uint8_t state = 0;
1695 state = set_is_unloading(state, is_unloading);
1696 state = set_unloading_cycle(state, unloading_cycle);
1697 return state;
1698 }
1699};
1700
1701bool nmethod::is_unloading() {
1702 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state);
1703 bool state_is_unloading = IsUnloadingState::is_unloading(state);
1704 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
1705 if (state_is_unloading) {
1706 return true;
1707 }
1708 uint8_t current_cycle = CodeCache::unloading_cycle();
1709 if (state_unloading_cycle == current_cycle) {
1710 return false;
1711 }
1712
1713 // The IsUnloadingBehaviour is responsible for checking if there are any dead
1714 // oops in the CompiledMethod, by calling oops_do on it.
1715 state_unloading_cycle = current_cycle;
1716
1717 if (is_zombie()) {
1718 // Zombies without calculated unloading epoch are never unloading due to GC.
1719
1720 // There are no races where a previously observed is_unloading() nmethod
1721 // suddenly becomes not is_unloading() due to here being observed as zombie.
1722
1723 // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked
1724 // and unloaded in the safepoint. That makes races where an nmethod is first
1725 // observed as is_alive() && is_unloading() and subsequently observed as
1726 // is_zombie() impossible.
1727
1728 // With concurrent unloading, all references to is_unloading() nmethods are
1729 // first unlinked (e.g. IC caches and dependency contexts). Then a global
1730 // handshake operation is performed with all JavaThreads before finally
1731 // unloading the nmethods. The sweeper never converts is_alive() && is_unloading()
1732 // nmethods to zombies; it waits for them to become is_unloaded(). So before
1733 // the global handshake, it is impossible for is_unloading() nmethods to
1734 // racingly become is_zombie(). And is_unloading() is calculated for all is_alive()
1735 // nmethods before taking that global handshake, meaning that it will never
1736 // be recalculated after the handshake.
1737
1738 // After that global handshake, is_unloading() nmethods are only observable
1739 // to the iterators, and they will never trigger recomputation of the cached
1740 // is_unloading_state, and hence may not suffer from such races.
1741
1742 state_is_unloading = false;
1743 } else {
1744 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this);
1745 }
1746
1747 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
1748
1749 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1750
1751 return state_is_unloading;
1752}
1753
1754void nmethod::clear_unloading_state() {
1755 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
1756 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
1757}
1758
1759
1760// This is called at the end of the strong tracing/marking phase of a
1761// GC to unload an nmethod if it contains otherwise unreachable
1762// oops.
1763
1764void nmethod::do_unloading(bool unloading_occurred) {
1765 // Make sure the oop's ready to receive visitors
1766 assert(!is_zombie() && !is_unloaded(),
1767 "should not call follow on zombie or unloaded nmethod");
1768
1769 if (is_unloading()) {
1770 make_unloaded();
1771 } else {
1772 guarantee(unload_nmethod_caches(unloading_occurred),
1773 "Should not need transition stubs");
1774 }
1775}
1776
1777void nmethod::oops_do(OopClosure* f, bool allow_dead) {
1778 // make sure the oops ready to receive visitors
1779 assert(allow_dead || is_alive(), "should not call follow on dead nmethod");
1780
1781 // Prevent extra code cache walk for platforms that don't have immediate oops.
1782 if (relocInfo::mustIterateImmediateOopsInCode()) {
1783 RelocIterator iter(this, oops_reloc_begin());
1784
1785 while (iter.next()) {
1786 if (iter.type() == relocInfo::oop_type ) {
1787 oop_Relocation* r = iter.oop_reloc();
1788 // In this loop, we must only follow those oops directly embedded in
1789 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
1790 assert(1 == (r->oop_is_immediate()) +
1791 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
1792 "oop must be found in exactly one place");
1793 if (r->oop_is_immediate() && r->oop_value() != NULL) {
1794 f->do_oop(r->oop_addr());
1795 }
1796 }
1797 }
1798 }
1799
1800 // Scopes
1801 // This includes oop constants not inlined in the code stream.
1802 for (oop* p = oops_begin(); p < oops_end(); p++) {
1803 if (*p == Universe::non_oop_word()) continue; // skip non-oops
1804 f->do_oop(p);
1805 }
1806}
1807
1808#define NMETHOD_SENTINEL ((nmethod*)badAddress)
1809
1810nmethod* volatile nmethod::_oops_do_mark_nmethods;
1811
1812// An nmethod is "marked" if its _mark_link is set non-null.
1813// Even if it is the end of the linked list, it will have a non-null link value,
1814// as long as it is on the list.
1815// This code must be MP safe, because it is used from parallel GC passes.
1816bool nmethod::test_set_oops_do_mark() {
1817 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
1818 if (_oops_do_mark_link == NULL) {
1819 // Claim this nmethod for this thread to mark.
1820 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) {
1821 // Atomically append this nmethod (now claimed) to the head of the list:
1822 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
1823 for (;;) {
1824 nmethod* required_mark_nmethods = observed_mark_nmethods;
1825 _oops_do_mark_link = required_mark_nmethods;
1826 observed_mark_nmethods =
1827 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods);
1828 if (observed_mark_nmethods == required_mark_nmethods)
1829 break;
1830 }
1831 // Mark was clear when we first saw this guy.
1832 LogTarget(Trace, gc, nmethod) lt;
1833 if (lt.is_enabled()) {
1834 LogStream ls(lt);
1835 CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true);
1836 }
1837 return false;
1838 }
1839 }
1840 // On fall through, another racing thread marked this nmethod before we did.
1841 return true;
1842}
1843
1844void nmethod::oops_do_marking_prologue() {
1845 log_trace(gc, nmethod)("oops_do_marking_prologue");
1846 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
1847 // We use cmpxchg instead of regular assignment here because the user
1848 // may fork a bunch of threads, and we need them all to see the same state.
1849 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL);
1850 guarantee(observed == NULL, "no races in this sequential code");
1851}
1852
1853void nmethod::oops_do_marking_epilogue() {
1854 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
1855 nmethod* cur = _oops_do_mark_nmethods;
1856 while (cur != NMETHOD_SENTINEL) {
1857 assert(cur != NULL, "not NULL-terminated");
1858 nmethod* next = cur->_oops_do_mark_link;
1859 cur->_oops_do_mark_link = NULL;
1860 DEBUG_ONLY(cur->verify_oop_relocations());
1861
1862 LogTarget(Trace, gc, nmethod) lt;
1863 if (lt.is_enabled()) {
1864 LogStream ls(lt);
1865 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
1866 }
1867 cur = next;
1868 }
1869 nmethod* required = _oops_do_mark_nmethods;
1870 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required);
1871 guarantee(observed == required, "no races in this sequential code");
1872 log_trace(gc, nmethod)("oops_do_marking_epilogue");
1873}
1874
1875inline bool includes(void* p, void* from, void* to) {
1876 return from <= p && p < to;
1877}
1878
1879
1880void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
1881 assert(count >= 2, "must be sentinel values, at least");
1882
1883#ifdef ASSERT
1884 // must be sorted and unique; we do a binary search in find_pc_desc()
1885 int prev_offset = pcs[0].pc_offset();
1886 assert(prev_offset == PcDesc::lower_offset_limit,
1887 "must start with a sentinel");
1888 for (int i = 1; i < count; i++) {
1889 int this_offset = pcs[i].pc_offset();
1890 assert(this_offset > prev_offset, "offsets must be sorted");
1891 prev_offset = this_offset;
1892 }
1893 assert(prev_offset == PcDesc::upper_offset_limit,
1894 "must end with a sentinel");
1895#endif //ASSERT
1896
1897 // Search for MethodHandle invokes and tag the nmethod.
1898 for (int i = 0; i < count; i++) {
1899 if (pcs[i].is_method_handle_invoke()) {
1900 set_has_method_handle_invokes(true);
1901 break;
1902 }
1903 }
1904 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler");
1905
1906 int size = count * sizeof(PcDesc);
1907 assert(scopes_pcs_size() >= size, "oob");
1908 memcpy(scopes_pcs_begin(), pcs, size);
1909
1910 // Adjust the final sentinel downward.
1911 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
1912 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
1913 last_pc->set_pc_offset(content_size() + 1);
1914 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
1915 // Fill any rounding gaps with copies of the last record.
1916 last_pc[1] = last_pc[0];
1917 }
1918 // The following assert could fail if sizeof(PcDesc) is not
1919 // an integral multiple of oopSize (the rounding term).
1920 // If it fails, change the logic to always allocate a multiple
1921 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
1922 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
1923}
1924
1925void nmethod::copy_scopes_data(u_char* buffer, int size) {
1926 assert(scopes_data_size() >= size, "oob");
1927 memcpy(scopes_data_begin(), buffer, size);
1928}
1929
1930#ifdef ASSERT
1931static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) {
1932 PcDesc* lower = search.scopes_pcs_begin();
1933 PcDesc* upper = search.scopes_pcs_end();
1934 lower += 1; // exclude initial sentinel
1935 PcDesc* res = NULL;
1936 for (PcDesc* p = lower; p < upper; p++) {
1937 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
1938 if (match_desc(p, pc_offset, approximate)) {
1939 if (res == NULL)
1940 res = p;
1941 else
1942 res = (PcDesc*) badAddress;
1943 }
1944 }
1945 return res;
1946}
1947#endif
1948
1949
1950// Finds a PcDesc with real-pc equal to "pc"
1951PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) {
1952 address base_address = search.code_begin();
1953 if ((pc < base_address) ||
1954 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
1955 return NULL; // PC is wildly out of range
1956 }
1957 int pc_offset = (int) (pc - base_address);
1958
1959 // Check the PcDesc cache if it contains the desired PcDesc
1960 // (This as an almost 100% hit rate.)
1961 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
1962 if (res != NULL) {
1963 assert(res == linear_search(search, pc_offset, approximate), "cache ok");
1964 return res;
1965 }
1966
1967 // Fallback algorithm: quasi-linear search for the PcDesc
1968 // Find the last pc_offset less than the given offset.
1969 // The successor must be the required match, if there is a match at all.
1970 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
1971 PcDesc* lower = search.scopes_pcs_begin();
1972 PcDesc* upper = search.scopes_pcs_end();
1973 upper -= 1; // exclude final sentinel
1974 if (lower >= upper) return NULL; // native method; no PcDescs at all
1975
1976#define assert_LU_OK \
1977 /* invariant on lower..upper during the following search: */ \
1978 assert(lower->pc_offset() < pc_offset, "sanity"); \
1979 assert(upper->pc_offset() >= pc_offset, "sanity")
1980 assert_LU_OK;
1981
1982 // Use the last successful return as a split point.
1983 PcDesc* mid = _pc_desc_cache.last_pc_desc();
1984 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1985 if (mid->pc_offset() < pc_offset) {
1986 lower = mid;
1987 } else {
1988 upper = mid;
1989 }
1990
1991 // Take giant steps at first (4096, then 256, then 16, then 1)
1992 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
1993 const int RADIX = (1 << LOG2_RADIX);
1994 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
1995 while ((mid = lower + step) < upper) {
1996 assert_LU_OK;
1997 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
1998 if (mid->pc_offset() < pc_offset) {
1999 lower = mid;
2000 } else {
2001 upper = mid;
2002 break;
2003 }
2004 }
2005 assert_LU_OK;
2006 }
2007
2008 // Sneak up on the value with a linear search of length ~16.
2009 while (true) {
2010 assert_LU_OK;
2011 mid = lower + 1;
2012 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2013 if (mid->pc_offset() < pc_offset) {
2014 lower = mid;
2015 } else {
2016 upper = mid;
2017 break;
2018 }
2019 }
2020#undef assert_LU_OK
2021
2022 if (match_desc(upper, pc_offset, approximate)) {
2023 assert(upper == linear_search(search, pc_offset, approximate), "search ok");
2024 _pc_desc_cache.add_pc_desc(upper);
2025 return upper;
2026 } else {
2027 assert(NULL == linear_search(search, pc_offset, approximate), "search ok");
2028 return NULL;
2029 }
2030}
2031
2032
2033void nmethod::check_all_dependencies(DepChange& changes) {
2034 // Checked dependencies are allocated into this ResourceMark
2035 ResourceMark rm;
2036
2037 // Turn off dependency tracing while actually testing dependencies.
2038 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
2039
2040 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash,
2041 &DependencySignature::equals, 11027> DepTable;
2042
2043 DepTable* table = new DepTable();
2044
2045 // Iterate over live nmethods and check dependencies of all nmethods that are not
2046 // marked for deoptimization. A particular dependency is only checked once.
2047 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading);
2048 while(iter.next()) {
2049 nmethod* nm = iter.method();
2050 // Only notify for live nmethods
2051 if (!nm->is_marked_for_deoptimization()) {
2052 for (Dependencies::DepStream deps(nm); deps.next(); ) {
2053 // Construct abstraction of a dependency.
2054 DependencySignature* current_sig = new DependencySignature(deps);
2055
2056 // Determine if dependency is already checked. table->put(...) returns
2057 // 'true' if the dependency is added (i.e., was not in the hashtable).
2058 if (table->put(*current_sig, 1)) {
2059 if (deps.check_dependency() != NULL) {
2060 // Dependency checking failed. Print out information about the failed
2061 // dependency and finally fail with an assert. We can fail here, since
2062 // dependency checking is never done in a product build.
2063 tty->print_cr("Failed dependency:");
2064 changes.print();
2065 nm->print();
2066 nm->print_dependencies();
2067 assert(false, "Should have been marked for deoptimization");
2068 }
2069 }
2070 }
2071 }
2072 }
2073}
2074
2075bool nmethod::check_dependency_on(DepChange& changes) {
2076 // What has happened:
2077 // 1) a new class dependee has been added
2078 // 2) dependee and all its super classes have been marked
2079 bool found_check = false; // set true if we are upset
2080 for (Dependencies::DepStream deps(this); deps.next(); ) {
2081 // Evaluate only relevant dependencies.
2082 if (deps.spot_check_dependency_at(changes) != NULL) {
2083 found_check = true;
2084 NOT_DEBUG(break);
2085 }
2086 }
2087 return found_check;
2088}
2089
2090// Called from mark_for_deoptimization, when dependee is invalidated.
2091bool nmethod::is_dependent_on_method(Method* dependee) {
2092 for (Dependencies::DepStream deps(this); deps.next(); ) {
2093 if (deps.type() != Dependencies::evol_method)
2094 continue;
2095 Method* method = deps.method_argument(0);
2096 if (method == dependee) return true;
2097 }
2098 return false;
2099}
2100
2101
2102bool nmethod::is_patchable_at(address instr_addr) {
2103 assert(insts_contains(instr_addr), "wrong nmethod used");
2104 if (is_zombie()) {
2105 // a zombie may never be patched
2106 return false;
2107 }
2108 return true;
2109}
2110
2111
2112void nmethod_init() {
2113 // make sure you didn't forget to adjust the filler fields
2114 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
2115}
2116
2117
2118//-------------------------------------------------------------------------------------------
2119
2120
2121// QQQ might we make this work from a frame??
2122nmethodLocker::nmethodLocker(address pc) {
2123 CodeBlob* cb = CodeCache::find_blob(pc);
2124 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found");
2125 _nm = cb->as_compiled_method();
2126 lock_nmethod(_nm);
2127}
2128
2129// Only JvmtiDeferredEvent::compiled_method_unload_event()
2130// should pass zombie_ok == true.
2131void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) {
2132 if (cm == NULL) return;
2133 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2134 nmethod* nm = cm->as_nmethod();
2135 Atomic::inc(&nm->_lock_count);
2136 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method: %p", nm);
2137}
2138
2139void nmethodLocker::unlock_nmethod(CompiledMethod* cm) {
2140 if (cm == NULL) return;
2141 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method
2142 nmethod* nm = cm->as_nmethod();
2143 Atomic::dec(&nm->_lock_count);
2144 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
2145}
2146
2147
2148// -----------------------------------------------------------------------------
2149// Verification
2150
2151class VerifyOopsClosure: public OopClosure {
2152 nmethod* _nm;
2153 bool _ok;
2154public:
2155 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
2156 bool ok() { return _ok; }
2157 virtual void do_oop(oop* p) {
2158 if (oopDesc::is_oop_or_null(*p)) return;
2159 // Print diagnostic information before calling print_nmethod().
2160 // Assertions therein might prevent call from returning.
2161 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
2162 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
2163 if (_ok) {
2164 _nm->print_nmethod(true);
2165 _ok = false;
2166 }
2167 }
2168 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2169};
2170
2171void nmethod::verify() {
2172
2173 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
2174 // seems odd.
2175
2176 if (is_zombie() || is_not_entrant() || is_unloaded())
2177 return;
2178
2179 // Make sure all the entry points are correctly aligned for patching.
2180 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
2181
2182 // assert(oopDesc::is_oop(method()), "must be valid");
2183
2184 ResourceMark rm;
2185
2186 if (!CodeCache::contains(this)) {
2187 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
2188 }
2189
2190 if(is_native_method() )
2191 return;
2192
2193 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
2194 if (nm != this) {
2195 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
2196 }
2197
2198 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2199 if (! p->verify(this)) {
2200 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
2201 }
2202 }
2203
2204#ifdef ASSERT
2205#if INCLUDE_JVMCI
2206 {
2207 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap
2208 ImmutableOopMapSet* oms = oop_maps();
2209 ImplicitExceptionTable implicit_table(this);
2210 for (uint i = 0; i < implicit_table.len(); i++) {
2211 int exec_offset = (int) implicit_table.get_exec_offset(i);
2212 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) {
2213 assert(pc_desc_at(code_begin() + exec_offset) != NULL, "missing PcDesc");
2214 bool found = false;
2215 for (int i = 0, imax = oms->count(); i < imax; i++) {
2216 if (oms->pair_at(i)->pc_offset() == exec_offset) {
2217 found = true;
2218 break;
2219 }
2220 }
2221 assert(found, "missing oopmap");
2222 }
2223 }
2224 }
2225#endif
2226#endif
2227
2228 VerifyOopsClosure voc(this);
2229 oops_do(&voc);
2230 assert(voc.ok(), "embedded oops must be OK");
2231 Universe::heap()->verify_nmethod(this);
2232
2233 verify_scopes();
2234}
2235
2236
2237void nmethod::verify_interrupt_point(address call_site) {
2238 // Verify IC only when nmethod installation is finished.
2239 if (!is_not_installed()) {
2240 if (CompiledICLocker::is_safe(this)) {
2241 CompiledIC_at(this, call_site);
2242 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
2243 } else {
2244 CompiledICLocker ml_verify(this);
2245 CompiledIC_at(this, call_site);
2246 }
2247 }
2248
2249 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
2250 assert(pd != NULL, "PcDesc must exist");
2251 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
2252 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(),
2253 pd->return_oop());
2254 !sd->is_top(); sd = sd->sender()) {
2255 sd->verify();
2256 }
2257}
2258
2259void nmethod::verify_scopes() {
2260 if( !method() ) return; // Runtime stubs have no scope
2261 if (method()->is_native()) return; // Ignore stub methods.
2262 // iterate through all interrupt point
2263 // and verify the debug information is valid.
2264 RelocIterator iter((nmethod*)this);
2265 while (iter.next()) {
2266 address stub = NULL;
2267 switch (iter.type()) {
2268 case relocInfo::virtual_call_type:
2269 verify_interrupt_point(iter.addr());
2270 break;
2271 case relocInfo::opt_virtual_call_type:
2272 stub = iter.opt_virtual_call_reloc()->static_stub(false);
2273 verify_interrupt_point(iter.addr());
2274 break;
2275 case relocInfo::static_call_type:
2276 stub = iter.static_call_reloc()->static_stub(false);
2277 //verify_interrupt_point(iter.addr());
2278 break;
2279 case relocInfo::runtime_call_type:
2280 case relocInfo::runtime_call_w_cp_type: {
2281 address destination = iter.reloc()->value();
2282 // Right now there is no way to find out which entries support
2283 // an interrupt point. It would be nice if we had this
2284 // information in a table.
2285 break;
2286 }
2287 default:
2288 break;
2289 }
2290 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
2291 }
2292}
2293
2294
2295// -----------------------------------------------------------------------------
2296// Printing operations
2297
2298void nmethod::print() const {
2299 ttyLocker ttyl; // keep the following output all in one block
2300 print(tty);
2301}
2302
2303void nmethod::print(outputStream* st) const {
2304 ResourceMark rm;
2305
2306 st->print("Compiled method ");
2307
2308 if (is_compiled_by_c1()) {
2309 st->print("(c1) ");
2310 } else if (is_compiled_by_c2()) {
2311 st->print("(c2) ");
2312 } else if (is_compiled_by_jvmci()) {
2313 st->print("(JVMCI) ");
2314 } else {
2315 st->print("(n/a) ");
2316 }
2317
2318 print_on(tty, NULL);
2319
2320 if (WizardMode) {
2321 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
2322 st->print(" for method " INTPTR_FORMAT , p2i(method()));
2323 st->print(" { ");
2324 st->print_cr("%s ", state());
2325 st->print_cr("}:");
2326 }
2327 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2328 p2i(this),
2329 p2i(this) + size(),
2330 size());
2331 if (relocation_size () > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2332 p2i(relocation_begin()),
2333 p2i(relocation_end()),
2334 relocation_size());
2335 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2336 p2i(consts_begin()),
2337 p2i(consts_end()),
2338 consts_size());
2339 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2340 p2i(insts_begin()),
2341 p2i(insts_end()),
2342 insts_size());
2343 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2344 p2i(stub_begin()),
2345 p2i(stub_end()),
2346 stub_size());
2347 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2348 p2i(oops_begin()),
2349 p2i(oops_end()),
2350 oops_size());
2351 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2352 p2i(metadata_begin()),
2353 p2i(metadata_end()),
2354 metadata_size());
2355 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2356 p2i(scopes_data_begin()),
2357 p2i(scopes_data_end()),
2358 scopes_data_size());
2359 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2360 p2i(scopes_pcs_begin()),
2361 p2i(scopes_pcs_end()),
2362 scopes_pcs_size());
2363 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2364 p2i(dependencies_begin()),
2365 p2i(dependencies_end()),
2366 dependencies_size());
2367 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2368 p2i(handler_table_begin()),
2369 p2i(handler_table_end()),
2370 handler_table_size());
2371 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2372 p2i(nul_chk_table_begin()),
2373 p2i(nul_chk_table_end()),
2374 nul_chk_table_size());
2375#if INCLUDE_JVMCI
2376 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2377 p2i(speculations_begin()),
2378 p2i(speculations_end()),
2379 speculations_size());
2380 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
2381 p2i(jvmci_data_begin()),
2382 p2i(jvmci_data_end()),
2383 jvmci_data_size());
2384#endif
2385}
2386
2387void nmethod::print_code() {
2388 HandleMark hm;
2389 ResourceMark m;
2390 ttyLocker ttyl;
2391 // Call the specialized decode method of this class.
2392 decode(tty);
2393}
2394
2395#ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
2396
2397void nmethod::print_dependencies() {
2398 ResourceMark rm;
2399 ttyLocker ttyl; // keep the following output all in one block
2400 tty->print_cr("Dependencies:");
2401 for (Dependencies::DepStream deps(this); deps.next(); ) {
2402 deps.print_dependency();
2403 Klass* ctxk = deps.context_type();
2404 if (ctxk != NULL) {
2405 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) {
2406 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name());
2407 }
2408 }
2409 deps.log_dependency(); // put it into the xml log also
2410 }
2411}
2412#endif
2413
2414#if defined(SUPPORT_DATA_STRUCTS)
2415
2416// Print the oops from the underlying CodeBlob.
2417void nmethod::print_oops(outputStream* st) {
2418 HandleMark hm;
2419 ResourceMark m;
2420 st->print("Oops:");
2421 if (oops_begin() < oops_end()) {
2422 st->cr();
2423 for (oop* p = oops_begin(); p < oops_end(); p++) {
2424 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
2425 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
2426 if (*p == Universe::non_oop_word()) {
2427 st->print_cr("NON_OOP");
2428 continue; // skip non-oops
2429 }
2430 if (*p == NULL) {
2431 st->print_cr("NULL-oop");
2432 continue; // skip non-oops
2433 }
2434 (*p)->print_value_on(st);
2435 st->cr();
2436 }
2437 } else {
2438 st->print_cr(" <list empty>");
2439 }
2440}
2441
2442// Print metadata pool.
2443void nmethod::print_metadata(outputStream* st) {
2444 HandleMark hm;
2445 ResourceMark m;
2446 st->print("Metadata:");
2447 if (metadata_begin() < metadata_end()) {
2448 st->cr();
2449 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2450 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
2451 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
2452 if (*p && *p != Universe::non_oop_word()) {
2453 (*p)->print_value_on(st);
2454 }
2455 st->cr();
2456 }
2457 } else {
2458 st->print_cr(" <list empty>");
2459 }
2460}
2461
2462#ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
2463void nmethod::print_scopes_on(outputStream* st) {
2464 // Find the first pc desc for all scopes in the code and print it.
2465 ResourceMark rm;
2466 st->print("scopes:");
2467 if (scopes_pcs_begin() < scopes_pcs_end()) {
2468 st->cr();
2469 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2470 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
2471 continue;
2472
2473 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
2474 while (sd != NULL) {
2475 sd->print_on(st, p); // print output ends with a newline
2476 sd = sd->sender();
2477 }
2478 }
2479 } else {
2480 st->print_cr(" <list empty>");
2481 }
2482}
2483#endif
2484
2485#ifndef PRODUCT // RelocIterator does support printing only then.
2486void nmethod::print_relocations() {
2487 ResourceMark m; // in case methods get printed via the debugger
2488 tty->print_cr("relocations:");
2489 RelocIterator iter(this);
2490 iter.print();
2491}
2492#endif
2493
2494void nmethod::print_pcs_on(outputStream* st) {
2495 ResourceMark m; // in case methods get printed via debugger
2496 st->print("pc-bytecode offsets:");
2497 if (scopes_pcs_begin() < scopes_pcs_end()) {
2498 st->cr();
2499 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
2500 p->print_on(st, this); // print output ends with a newline
2501 }
2502 } else {
2503 st->print_cr(" <list empty>");
2504 }
2505}
2506
2507void nmethod::print_handler_table() {
2508 ExceptionHandlerTable(this).print();
2509}
2510
2511void nmethod::print_nul_chk_table() {
2512 ImplicitExceptionTable(this).print(code_begin());
2513}
2514
2515void nmethod::print_recorded_oops() {
2516 const int n = oops_count();
2517 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2518 tty->print("Recorded oops:");
2519 if (n > 0) {
2520 tty->cr();
2521 for (int i = 0; i < n; i++) {
2522 oop o = oop_at(i);
2523 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(o));
2524 if (o == (oop)Universe::non_oop_word()) {
2525 tty->print("non-oop word");
2526 } else if (o == NULL) {
2527 tty->print("NULL-oop");
2528 } else {
2529 o->print_value_on(tty);
2530 }
2531 tty->cr();
2532 }
2533 } else {
2534 tty->print_cr(" <list empty>");
2535 }
2536}
2537
2538void nmethod::print_recorded_metadata() {
2539 const int n = metadata_count();
2540 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
2541 tty->print("Recorded metadata:");
2542 if (n > 0) {
2543 tty->cr();
2544 for (int i = 0; i < n; i++) {
2545 Metadata* m = metadata_at(i);
2546 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
2547 if (m == (Metadata*)Universe::non_oop_word()) {
2548 tty->print("non-metadata word");
2549 } else if (m == NULL) {
2550 tty->print("NULL-oop");
2551 } else {
2552 Metadata::print_value_on_maybe_null(tty, m);
2553 }
2554 tty->cr();
2555 }
2556 } else {
2557 tty->print_cr(" <list empty>");
2558 }
2559}
2560#endif
2561
2562#if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
2563
2564void nmethod::print_constant_pool(outputStream* st) {
2565 //-----------------------------------
2566 //---< Print the constant pool >---
2567 //-----------------------------------
2568 int consts_size = this->consts_size();
2569 if ( consts_size > 0 ) {
2570 unsigned char* cstart = this->consts_begin();
2571 unsigned char* cp = cstart;
2572 unsigned char* cend = cp + consts_size;
2573 unsigned int bytes_per_line = 4;
2574 unsigned int CP_alignment = 8;
2575 unsigned int n;
2576
2577 st->cr();
2578
2579 //---< print CP header to make clear what's printed >---
2580 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
2581 n = bytes_per_line;
2582 st->print_cr("[Constant Pool]");
2583 Disassembler::print_location(cp, cstart, cend, st, true, true);
2584 Disassembler::print_hexdata(cp, n, st, true);
2585 st->cr();
2586 } else {
2587 n = (uintptr_t)cp&(bytes_per_line-1);
2588 st->print_cr("[Constant Pool (unaligned)]");
2589 }
2590
2591 //---< print CP contents, bytes_per_line at a time >---
2592 while (cp < cend) {
2593 Disassembler::print_location(cp, cstart, cend, st, true, false);
2594 Disassembler::print_hexdata(cp, n, st, false);
2595 cp += n;
2596 n = bytes_per_line;
2597 st->cr();
2598 }
2599
2600 //---< Show potential alignment gap between constant pool and code >---
2601 cend = code_begin();
2602 if( cp < cend ) {
2603 n = 4;
2604 st->print_cr("[Code entry alignment]");
2605 while (cp < cend) {
2606 Disassembler::print_location(cp, cstart, cend, st, false, false);
2607 cp += n;
2608 st->cr();
2609 }
2610 }
2611 } else {
2612 st->print_cr("[Constant Pool (empty)]");
2613 }
2614 st->cr();
2615}
2616
2617#endif
2618
2619// Disassemble this nmethod.
2620// Print additional debug information, if requested. This could be code
2621// comments, block comments, profiling counters, etc.
2622// The undisassembled format is useful no disassembler library is available.
2623// The resulting hex dump (with markers) can be disassembled later, or on
2624// another system, when/where a disassembler library is available.
2625void nmethod::decode2(outputStream* ost) const {
2626
2627 // Called from frame::back_trace_with_decode without ResourceMark.
2628 ResourceMark rm;
2629
2630 // Make sure we have a valid stream to print on.
2631 outputStream* st = ost ? ost : tty;
2632
2633#if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
2634 const bool use_compressed_format = true;
2635 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2636 AbstractDisassembler::show_block_comment());
2637#else
2638 const bool use_compressed_format = Disassembler::is_abstract();
2639 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
2640 AbstractDisassembler::show_block_comment());
2641#endif
2642
2643 st->cr();
2644 this->print(st);
2645 st->cr();
2646
2647#if defined(SUPPORT_ASSEMBLY)
2648 //----------------------------------
2649 //---< Print real disassembly >---
2650 //----------------------------------
2651 if (! use_compressed_format) {
2652 Disassembler::decode(const_cast<nmethod*>(this), st);
2653 return;
2654 }
2655#endif
2656
2657#if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2658
2659 // Compressed undisassembled disassembly format.
2660 // The following stati are defined/supported:
2661 // = 0 - currently at bol() position, nothing printed yet on current line.
2662 // = 1 - currently at position after print_location().
2663 // > 1 - in the midst of printing instruction stream bytes.
2664 int compressed_format_idx = 0;
2665 int code_comment_column = 0;
2666 const int instr_maxlen = Assembler::instr_maxlen();
2667 const uint tabspacing = 8;
2668 unsigned char* start = this->code_begin();
2669 unsigned char* p = this->code_begin();
2670 unsigned char* end = this->code_end();
2671 unsigned char* pss = p; // start of a code section (used for offsets)
2672
2673 if ((start == NULL) || (end == NULL)) {
2674 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
2675 return;
2676 }
2677#endif
2678
2679#if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2680 //---< plain abstract disassembly, no comments or anything, just section headers >---
2681 if (use_compressed_format && ! compressed_with_comments) {
2682 const_cast<nmethod*>(this)->print_constant_pool(st);
2683
2684 //---< Open the output (Marker for post-mortem disassembler) >---
2685 st->print_cr("[MachCode]");
2686 const char* header = NULL;
2687 address p0 = p;
2688 while (p < end) {
2689 address pp = p;
2690 while ((p < end) && (header == NULL)) {
2691 header = nmethod_section_label(p);
2692 pp = p;
2693 p += Assembler::instr_len(p);
2694 }
2695 if (pp > p0) {
2696 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
2697 p0 = pp;
2698 p = pp;
2699 header = NULL;
2700 } else if (header != NULL) {
2701 st->bol();
2702 st->print_cr("%s", header);
2703 header = NULL;
2704 }
2705 }
2706 //---< Close the output (Marker for post-mortem disassembler) >---
2707 st->bol();
2708 st->print_cr("[/MachCode]");
2709 return;
2710 }
2711#endif
2712
2713#if defined(SUPPORT_ABSTRACT_ASSEMBLY)
2714 //---< abstract disassembly with comments and section headers merged in >---
2715 if (compressed_with_comments) {
2716 const_cast<nmethod*>(this)->print_constant_pool(st);
2717
2718 //---< Open the output (Marker for post-mortem disassembler) >---
2719 st->print_cr("[MachCode]");
2720 while ((p < end) && (p != NULL)) {
2721 const int instruction_size_in_bytes = Assembler::instr_len(p);
2722
2723 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
2724 // Outputs a bol() before and a cr() after, but only if a comment is printed.
2725 // Prints nmethod_section_label as well.
2726 if (AbstractDisassembler::show_block_comment()) {
2727 print_block_comment(st, p);
2728 if (st->position() == 0) {
2729 compressed_format_idx = 0;
2730 }
2731 }
2732
2733 //---< New location information after line break >---
2734 if (compressed_format_idx == 0) {
2735 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2736 compressed_format_idx = 1;
2737 }
2738
2739 //---< Code comment for current instruction. Address range [p..(p+len)) >---
2740 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
2741 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
2742
2743 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
2744 //---< interrupt instruction byte stream for code comment >---
2745 if (compressed_format_idx > 1) {
2746 st->cr(); // interrupt byte stream
2747 st->cr(); // add an empty line
2748 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2749 }
2750 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
2751 st->bol();
2752 compressed_format_idx = 0;
2753 }
2754
2755 //---< New location information after line break >---
2756 if (compressed_format_idx == 0) {
2757 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
2758 compressed_format_idx = 1;
2759 }
2760
2761 //---< Nicely align instructions for readability >---
2762 if (compressed_format_idx > 1) {
2763 Disassembler::print_delimiter(st);
2764 }
2765
2766 //---< Now, finally, print the actual instruction bytes >---
2767 unsigned char* p0 = p;
2768 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
2769 compressed_format_idx += p - p0;
2770
2771 if (Disassembler::start_newline(compressed_format_idx-1)) {
2772 st->cr();
2773 compressed_format_idx = 0;
2774 }
2775 }
2776 //---< Close the output (Marker for post-mortem disassembler) >---
2777 st->bol();
2778 st->print_cr("[/MachCode]");
2779 return;
2780 }
2781#endif
2782}
2783
2784#if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
2785
2786const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
2787 RelocIterator iter(this, begin, end);
2788 bool have_one = false;
2789 while (iter.next()) {
2790 have_one = true;
2791 switch (iter.type()) {
2792 case relocInfo::none: return "no_reloc";
2793 case relocInfo::oop_type: {
2794 // Get a non-resizable resource-allocated stringStream.
2795 // Our callees make use of (nested) ResourceMarks.
2796 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
2797 oop_Relocation* r = iter.oop_reloc();
2798 oop obj = r->oop_value();
2799 st.print("oop(");
2800 if (obj == NULL) st.print("NULL");
2801 else obj->print_value_on(&st);
2802 st.print(")");
2803 return st.as_string();
2804 }
2805 case relocInfo::metadata_type: {
2806 stringStream st;
2807 metadata_Relocation* r = iter.metadata_reloc();
2808 Metadata* obj = r->metadata_value();
2809 st.print("metadata(");
2810 if (obj == NULL) st.print("NULL");
2811 else obj->print_value_on(&st);
2812 st.print(")");
2813 return st.as_string();
2814 }
2815 case relocInfo::runtime_call_type:
2816 case relocInfo::runtime_call_w_cp_type: {
2817 stringStream st;
2818 st.print("runtime_call");
2819 CallRelocation* r = (CallRelocation*)iter.reloc();
2820 address dest = r->destination();
2821 CodeBlob* cb = CodeCache::find_blob(dest);
2822 if (cb != NULL) {
2823 st.print(" %s", cb->name());
2824 } else {
2825 ResourceMark rm;
2826 const int buflen = 1024;
2827 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
2828 int offset;
2829 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
2830 st.print(" %s", buf);
2831 if (offset != 0) {
2832 st.print("+%d", offset);
2833 }
2834 }
2835 }
2836 return st.as_string();
2837 }
2838 case relocInfo::virtual_call_type: {
2839 stringStream st;
2840 st.print_raw("virtual_call");
2841 virtual_call_Relocation* r = iter.virtual_call_reloc();
2842 Method* m = r->method_value();
2843 if (m != NULL) {
2844 assert(m->is_method(), "");
2845 m->print_short_name(&st);
2846 }
2847 return st.as_string();
2848 }
2849 case relocInfo::opt_virtual_call_type: {
2850 stringStream st;
2851 st.print_raw("optimized virtual_call");
2852 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
2853 Method* m = r->method_value();
2854 if (m != NULL) {
2855 assert(m->is_method(), "");
2856 m->print_short_name(&st);
2857 }
2858 return st.as_string();
2859 }
2860 case relocInfo::static_call_type: {
2861 stringStream st;
2862 st.print_raw("static_call");
2863 static_call_Relocation* r = iter.static_call_reloc();
2864 Method* m = r->method_value();
2865 if (m != NULL) {
2866 assert(m->is_method(), "");
2867 m->print_short_name(&st);
2868 }
2869 return st.as_string();
2870 }
2871 case relocInfo::static_stub_type: return "static_stub";
2872 case relocInfo::external_word_type: return "external_word";
2873 case relocInfo::internal_word_type: return "internal_word";
2874 case relocInfo::section_word_type: return "section_word";
2875 case relocInfo::poll_type: return "poll";
2876 case relocInfo::poll_return_type: return "poll_return";
2877 case relocInfo::trampoline_stub_type: return "trampoline_stub";
2878 case relocInfo::type_mask: return "type_bit_mask";
2879
2880 default:
2881 break;
2882 }
2883 }
2884 return have_one ? "other" : NULL;
2885}
2886
2887// Return a the last scope in (begin..end]
2888ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
2889 PcDesc* p = pc_desc_near(begin+1);
2890 if (p != NULL && p->real_pc(this) <= end) {
2891 return new ScopeDesc(this, p->scope_decode_offset(),
2892 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(),
2893 p->return_oop());
2894 }
2895 return NULL;
2896}
2897
2898const char* nmethod::nmethod_section_label(address pos) const {
2899 const char* label = NULL;
2900 if (pos == code_begin()) label = "[Instructions begin]";
2901 if (pos == entry_point()) label = "[Entry Point]";
2902 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
2903 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]";
2904 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
2905 // Check stub_code before checking exception_handler or deopt_handler.
2906 if (pos == this->stub_begin()) label = "[Stub Code]";
2907 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]";
2908 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]";
2909 return label;
2910}
2911
2912void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
2913 if (print_section_labels) {
2914 const char* label = nmethod_section_label(block_begin);
2915 if (label != NULL) {
2916 stream->bol();
2917 stream->print_cr("%s", label);
2918 }
2919 }
2920
2921 if (block_begin == entry_point()) {
2922 methodHandle m = method();
2923 if (m.not_null()) {
2924 stream->print(" # ");
2925 m->print_value_on(stream);
2926 stream->cr();
2927 }
2928 if (m.not_null() && !is_osr_method()) {
2929 ResourceMark rm;
2930 int sizeargs = m->size_of_parameters();
2931 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
2932 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
2933 {
2934 int sig_index = 0;
2935 if (!m->is_static())
2936 sig_bt[sig_index++] = T_OBJECT; // 'this'
2937 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
2938 BasicType t = ss.type();
2939 sig_bt[sig_index++] = t;
2940 if (type2size[t] == 2) {
2941 sig_bt[sig_index++] = T_VOID;
2942 } else {
2943 assert(type2size[t] == 1, "size is 1 or 2");
2944 }
2945 }
2946 assert(sig_index == sizeargs, "");
2947 }
2948 const char* spname = "sp"; // make arch-specific?
2949 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
2950 int stack_slot_offset = this->frame_size() * wordSize;
2951 int tab1 = 14, tab2 = 24;
2952 int sig_index = 0;
2953 int arg_index = (m->is_static() ? 0 : -1);
2954 bool did_old_sp = false;
2955 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
2956 bool at_this = (arg_index == -1);
2957 bool at_old_sp = false;
2958 BasicType t = (at_this ? T_OBJECT : ss.type());
2959 assert(t == sig_bt[sig_index], "sigs in sync");
2960 if (at_this)
2961 stream->print(" # this: ");
2962 else
2963 stream->print(" # parm%d: ", arg_index);
2964 stream->move_to(tab1);
2965 VMReg fst = regs[sig_index].first();
2966 VMReg snd = regs[sig_index].second();
2967 if (fst->is_reg()) {
2968 stream->print("%s", fst->name());
2969 if (snd->is_valid()) {
2970 stream->print(":%s", snd->name());
2971 }
2972 } else if (fst->is_stack()) {
2973 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
2974 if (offset == stack_slot_offset) at_old_sp = true;
2975 stream->print("[%s+0x%x]", spname, offset);
2976 } else {
2977 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
2978 }
2979 stream->print(" ");
2980 stream->move_to(tab2);
2981 stream->print("= ");
2982 if (at_this) {
2983 m->method_holder()->print_value_on(stream);
2984 } else {
2985 bool did_name = false;
2986 if (!at_this && ss.is_object()) {
2987 Symbol* name = ss.as_symbol_or_null();
2988 if (name != NULL) {
2989 name->print_value_on(stream);
2990 did_name = true;
2991 }
2992 }
2993 if (!did_name)
2994 stream->print("%s", type2name(t));
2995 }
2996 if (at_old_sp) {
2997 stream->print(" (%s of caller)", spname);
2998 did_old_sp = true;
2999 }
3000 stream->cr();
3001 sig_index += type2size[t];
3002 arg_index += 1;
3003 if (!at_this) ss.next();
3004 }
3005 if (!did_old_sp) {
3006 stream->print(" # ");
3007 stream->move_to(tab1);
3008 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3009 stream->print(" (%s of caller)", spname);
3010 stream->cr();
3011 }
3012 }
3013 }
3014}
3015
3016// Returns whether this nmethod has code comments.
3017bool nmethod::has_code_comment(address begin, address end) {
3018 // scopes?
3019 ScopeDesc* sd = scope_desc_in(begin, end);
3020 if (sd != NULL) return true;
3021
3022 // relocations?
3023 const char* str = reloc_string_for(begin, end);
3024 if (str != NULL) return true;
3025
3026 // implicit exceptions?
3027 int cont_offset = ImplicitExceptionTable(this).continuation_offset(begin - code_begin());
3028 if (cont_offset != 0) return true;
3029
3030 return false;
3031}
3032
3033void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
3034 ImplicitExceptionTable implicit_table(this);
3035 int pc_offset = begin - code_begin();
3036 int cont_offset = implicit_table.continuation_offset(pc_offset);
3037 bool oop_map_required = false;
3038 if (cont_offset != 0) {
3039 st->move_to(column, 6, 0);
3040 if (pc_offset == cont_offset) {
3041 st->print("; implicit exception: deoptimizes");
3042 oop_map_required = true;
3043 } else {
3044 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
3045 }
3046 }
3047
3048 // Find an oopmap in (begin, end]. We use the odd half-closed
3049 // interval so that oop maps and scope descs which are tied to the
3050 // byte after a call are printed with the call itself. OopMaps
3051 // associated with implicit exceptions are printed with the implicit
3052 // instruction.
3053 address base = code_begin();
3054 ImmutableOopMapSet* oms = oop_maps();
3055 if (oms != NULL) {
3056 for (int i = 0, imax = oms->count(); i < imax; i++) {
3057 const ImmutableOopMapPair* pair = oms->pair_at(i);
3058 const ImmutableOopMap* om = pair->get_from(oms);
3059 address pc = base + pair->pc_offset();
3060 if (pc >= begin) {
3061#if INCLUDE_JVMCI
3062 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset();
3063#else
3064 bool is_implicit_deopt = false;
3065#endif
3066 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) {
3067 st->move_to(column, 6, 0);
3068 st->print("; ");
3069 om->print_on(st);
3070 oop_map_required = false;
3071 }
3072 }
3073 if (pc > end) {
3074 break;
3075 }
3076 }
3077 }
3078 assert(!oop_map_required, "missed oopmap");
3079
3080 // Print any debug info present at this pc.
3081 ScopeDesc* sd = scope_desc_in(begin, end);
3082 if (sd != NULL) {
3083 st->move_to(column, 6, 0);
3084 if (sd->bci() == SynchronizationEntryBCI) {
3085 st->print(";*synchronization entry");
3086 } else if (sd->bci() == AfterBci) {
3087 st->print(";* method exit (unlocked if synchronized)");
3088 } else if (sd->bci() == UnwindBci) {
3089 st->print(";* unwind (locked if synchronized)");
3090 } else if (sd->bci() == AfterExceptionBci) {
3091 st->print(";* unwind (unlocked if synchronized)");
3092 } else if (sd->bci() == UnknownBci) {
3093 st->print(";* unknown");
3094 } else if (sd->bci() == InvalidFrameStateBci) {
3095 st->print(";* invalid frame state");
3096 } else {
3097 if (sd->method() == NULL) {
3098 st->print("method is NULL");
3099 } else if (sd->method()->is_native()) {
3100 st->print("method is native");
3101 } else {
3102 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
3103 st->print(";*%s", Bytecodes::name(bc));
3104 switch (bc) {
3105 case Bytecodes::_invokevirtual:
3106 case Bytecodes::_invokespecial:
3107 case Bytecodes::_invokestatic:
3108 case Bytecodes::_invokeinterface:
3109 {
3110 Bytecode_invoke invoke(sd->method(), sd->bci());
3111 st->print(" ");
3112 if (invoke.name() != NULL)
3113 invoke.name()->print_symbol_on(st);
3114 else
3115 st->print("<UNKNOWN>");
3116 break;
3117 }
3118 case Bytecodes::_getfield:
3119 case Bytecodes::_putfield:
3120 case Bytecodes::_getstatic:
3121 case Bytecodes::_putstatic:
3122 {
3123 Bytecode_field field(sd->method(), sd->bci());
3124 st->print(" ");
3125 if (field.name() != NULL)
3126 field.name()->print_symbol_on(st);
3127 else
3128 st->print("<UNKNOWN>");
3129 }
3130 default:
3131 break;
3132 }
3133 }
3134 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
3135 }
3136
3137 // Print all scopes
3138 for (;sd != NULL; sd = sd->sender()) {
3139 st->move_to(column, 6, 0);
3140 st->print("; -");
3141 if (sd->should_reexecute()) {
3142 st->print(" (reexecute)");
3143 }
3144 if (sd->method() == NULL) {
3145 st->print("method is NULL");
3146 } else {
3147 sd->method()->print_short_name(st);
3148 }
3149 int lineno = sd->method()->line_number_from_bci(sd->bci());
3150 if (lineno != -1) {
3151 st->print("@%d (line %d)", sd->bci(), lineno);
3152 } else {
3153 st->print("@%d", sd->bci());
3154 }
3155 st->cr();
3156 }
3157 }
3158
3159 // Print relocation information
3160 // Prevent memory leak: allocating without ResourceMark.
3161 ResourceMark rm;
3162 const char* str = reloc_string_for(begin, end);
3163 if (str != NULL) {
3164 if (sd != NULL) st->cr();
3165 st->move_to(column, 6, 0);
3166 st->print("; {%s}", str);
3167 }
3168}
3169
3170#endif
3171
3172class DirectNativeCallWrapper: public NativeCallWrapper {
3173private:
3174 NativeCall* _call;
3175
3176public:
3177 DirectNativeCallWrapper(NativeCall* call) : _call(call) {}
3178
3179 virtual address destination() const { return _call->destination(); }
3180 virtual address instruction_address() const { return _call->instruction_address(); }
3181 virtual address next_instruction_address() const { return _call->next_instruction_address(); }
3182 virtual address return_address() const { return _call->return_address(); }
3183
3184 virtual address get_resolve_call_stub(bool is_optimized) const {
3185 if (is_optimized) {
3186 return SharedRuntime::get_resolve_opt_virtual_call_stub();
3187 }
3188 return SharedRuntime::get_resolve_virtual_call_stub();
3189 }
3190
3191 virtual void set_destination_mt_safe(address dest) {
3192#if INCLUDE_AOT
3193 if (UseAOT) {
3194 CodeBlob* callee = CodeCache::find_blob(dest);
3195 CompiledMethod* cm = callee->as_compiled_method_or_null();
3196 if (cm != NULL && cm->is_far_code()) {
3197 // Temporary fix, see JDK-8143106
3198 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
3199 csc->set_to_far(methodHandle(cm->method()), dest);
3200 return;
3201 }
3202 }
3203#endif
3204 _call->set_destination_mt_safe(dest);
3205 }
3206
3207 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) {
3208 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address());
3209#if INCLUDE_AOT
3210 if (info.to_aot()) {
3211 csc->set_to_far(method, info.entry());
3212 } else
3213#endif
3214 {
3215 csc->set_to_interpreted(method, info.entry());
3216 }
3217 }
3218
3219 virtual void verify() const {
3220 // make sure code pattern is actually a call imm32 instruction
3221 _call->verify();
3222 _call->verify_alignment();
3223 }
3224
3225 virtual void verify_resolve_call(address dest) const {
3226 CodeBlob* db = CodeCache::find_blob_unsafe(dest);
3227 assert(db != NULL && !db->is_adapter_blob(), "must use stub!");
3228 }
3229
3230 virtual bool is_call_to_interpreted(address dest) const {
3231 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address());
3232 return cb->contains(dest);
3233 }
3234
3235 virtual bool is_safe_for_patching() const { return false; }
3236
3237 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const {
3238 return nativeMovConstReg_at(r->cached_value());
3239 }
3240
3241 virtual void *get_data(NativeInstruction* instruction) const {
3242 return (void*)((NativeMovConstReg*) instruction)->data();
3243 }
3244
3245 virtual void set_data(NativeInstruction* instruction, intptr_t data) {
3246 ((NativeMovConstReg*) instruction)->set_data(data);
3247 }
3248};
3249
3250NativeCallWrapper* nmethod::call_wrapper_at(address call) const {
3251 return new DirectNativeCallWrapper((NativeCall*) call);
3252}
3253
3254NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const {
3255 return new DirectNativeCallWrapper(nativeCall_before(return_pc));
3256}
3257
3258address nmethod::call_instruction_address(address pc) const {
3259 if (NativeCall::is_call_before(pc)) {
3260 NativeCall *ncall = nativeCall_before(pc);
3261 return ncall->instruction_address();
3262 }
3263 return NULL;
3264}
3265
3266CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const {
3267 return CompiledDirectStaticCall::at(call_site);
3268}
3269
3270CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const {
3271 return CompiledDirectStaticCall::at(call_site);
3272}
3273
3274CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const {
3275 return CompiledDirectStaticCall::before(return_addr);
3276}
3277
3278#if defined(SUPPORT_DATA_STRUCTS)
3279void nmethod::print_value_on(outputStream* st) const {
3280 st->print("nmethod");
3281 print_on(st, NULL);
3282}
3283#endif
3284
3285#ifndef PRODUCT
3286
3287void nmethod::print_calls(outputStream* st) {
3288 RelocIterator iter(this);
3289 while (iter.next()) {
3290 switch (iter.type()) {
3291 case relocInfo::virtual_call_type:
3292 case relocInfo::opt_virtual_call_type: {
3293 CompiledICLocker ml_verify(this);
3294 CompiledIC_at(&iter)->print();
3295 break;
3296 }
3297 case relocInfo::static_call_type:
3298 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
3299 CompiledDirectStaticCall::at(iter.reloc())->print();
3300 break;
3301 default:
3302 break;
3303 }
3304 }
3305}
3306
3307void nmethod::print_statistics() {
3308 ttyLocker ttyl;
3309 if (xtty != NULL) xtty->head("statistics type='nmethod'");
3310 native_nmethod_stats.print_native_nmethod_stats();
3311#ifdef COMPILER1
3312 c1_java_nmethod_stats.print_nmethod_stats("C1");
3313#endif
3314#ifdef COMPILER2
3315 c2_java_nmethod_stats.print_nmethod_stats("C2");
3316#endif
3317#if INCLUDE_JVMCI
3318 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
3319#endif
3320 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
3321 DebugInformationRecorder::print_statistics();
3322#ifndef PRODUCT
3323 pc_nmethod_stats.print_pc_stats();
3324#endif
3325 Dependencies::print_statistics();
3326 if (xtty != NULL) xtty->tail("statistics");
3327}
3328
3329#endif // !PRODUCT
3330
3331#if INCLUDE_JVMCI
3332void nmethod::update_speculation(JavaThread* thread) {
3333 jlong speculation = thread->pending_failed_speculation();
3334 if (speculation != 0) {
3335 guarantee(jvmci_nmethod_data() != NULL, "failed speculation in nmethod without failed speculation list");
3336 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
3337 thread->set_pending_failed_speculation(0);
3338 }
3339}
3340
3341const char* nmethod::jvmci_name() {
3342 if (jvmci_nmethod_data() != NULL) {
3343 return jvmci_nmethod_data()->name();
3344 }
3345 return NULL;
3346}
3347#endif
3348