Mercurial > hg > graal-compiler
annotate src/share/vm/code/dependencies.cpp @ 2334:dbad0519a1c4
6845426: non-static <clinit> method with no args is called during the class initialization process
Summary: Only call <clinit> with ACC_STATIC for classfiles with version > 50
Reviewed-by: acorn, dholmes, coleenp
author | kamg |
---|---|
date | Fri, 04 Mar 2011 14:40:46 -0500 |
parents | 3582bf76420e |
children | 1d1603768966 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
1552
c18cbe5936b8
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "ci/ciArrayKlass.hpp" | |
27 #include "ci/ciEnv.hpp" | |
28 #include "ci/ciKlass.hpp" | |
29 #include "ci/ciMethod.hpp" | |
30 #include "code/dependencies.hpp" | |
31 #include "compiler/compileLog.hpp" | |
32 #include "oops/oop.inline.hpp" | |
33 #include "runtime/handles.inline.hpp" | |
34 #include "utilities/copy.hpp" | |
0 | 35 |
36 | |
37 #ifdef ASSERT | |
38 static bool must_be_in_vm() { | |
39 Thread* thread = Thread::current(); | |
40 if (thread->is_Java_thread()) | |
41 return ((JavaThread*)thread)->thread_state() == _thread_in_vm; | |
42 else | |
43 return true; //something like this: thread->is_VM_thread(); | |
44 } | |
45 #endif //ASSERT | |
46 | |
47 void Dependencies::initialize(ciEnv* env) { | |
48 Arena* arena = env->arena(); | |
49 _oop_recorder = env->oop_recorder(); | |
50 _log = env->log(); | |
51 _dep_seen = new(arena) GrowableArray<int>(arena, 500, 0, 0); | |
52 DEBUG_ONLY(_deps[end_marker] = NULL); | |
53 for (int i = (int)FIRST_TYPE; i < (int)TYPE_LIMIT; i++) { | |
54 _deps[i] = new(arena) GrowableArray<ciObject*>(arena, 10, 0, 0); | |
55 } | |
56 _content_bytes = NULL; | |
57 _size_in_bytes = (size_t)-1; | |
58 | |
59 assert(TYPE_LIMIT <= (1<<LG2_TYPE_LIMIT), "sanity"); | |
60 } | |
61 | |
62 void Dependencies::assert_evol_method(ciMethod* m) { | |
63 assert_common_1(evol_method, m); | |
64 } | |
65 | |
66 void Dependencies::assert_leaf_type(ciKlass* ctxk) { | |
67 if (ctxk->is_array_klass()) { | |
68 // As a special case, support this assertion on an array type, | |
69 // which reduces to an assertion on its element type. | |
70 // Note that this cannot be done with assertions that | |
71 // relate to concreteness or abstractness. | |
72 ciType* elemt = ctxk->as_array_klass()->base_element_type(); | |
73 if (!elemt->is_instance_klass()) return; // Ex: int[][] | |
74 ctxk = elemt->as_instance_klass(); | |
75 //if (ctxk->is_final()) return; // Ex: String[][] | |
76 } | |
77 check_ctxk(ctxk); | |
78 assert_common_1(leaf_type, ctxk); | |
79 } | |
80 | |
81 void Dependencies::assert_abstract_with_unique_concrete_subtype(ciKlass* ctxk, ciKlass* conck) { | |
82 check_ctxk_abstract(ctxk); | |
83 assert_common_2(abstract_with_unique_concrete_subtype, ctxk, conck); | |
84 } | |
85 | |
86 void Dependencies::assert_abstract_with_no_concrete_subtype(ciKlass* ctxk) { | |
87 check_ctxk_abstract(ctxk); | |
88 assert_common_1(abstract_with_no_concrete_subtype, ctxk); | |
89 } | |
90 | |
91 void Dependencies::assert_concrete_with_no_concrete_subtype(ciKlass* ctxk) { | |
92 check_ctxk_concrete(ctxk); | |
93 assert_common_1(concrete_with_no_concrete_subtype, ctxk); | |
94 } | |
95 | |
96 void Dependencies::assert_unique_concrete_method(ciKlass* ctxk, ciMethod* uniqm) { | |
97 check_ctxk(ctxk); | |
98 assert_common_2(unique_concrete_method, ctxk, uniqm); | |
99 } | |
100 | |
101 void Dependencies::assert_abstract_with_exclusive_concrete_subtypes(ciKlass* ctxk, ciKlass* k1, ciKlass* k2) { | |
102 check_ctxk(ctxk); | |
103 assert_common_3(abstract_with_exclusive_concrete_subtypes_2, ctxk, k1, k2); | |
104 } | |
105 | |
106 void Dependencies::assert_exclusive_concrete_methods(ciKlass* ctxk, ciMethod* m1, ciMethod* m2) { | |
107 check_ctxk(ctxk); | |
108 assert_common_3(exclusive_concrete_methods_2, ctxk, m1, m2); | |
109 } | |
110 | |
111 void Dependencies::assert_has_no_finalizable_subclasses(ciKlass* ctxk) { | |
112 check_ctxk(ctxk); | |
113 assert_common_1(no_finalizable_subclasses, ctxk); | |
114 } | |
115 | |
116 // Helper function. If we are adding a new dep. under ctxk2, | |
117 // try to find an old dep. under a broader* ctxk1. If there is | |
118 // | |
119 bool Dependencies::maybe_merge_ctxk(GrowableArray<ciObject*>* deps, | |
120 int ctxk_i, ciKlass* ctxk2) { | |
121 ciKlass* ctxk1 = deps->at(ctxk_i)->as_klass(); | |
122 if (ctxk2->is_subtype_of(ctxk1)) { | |
123 return true; // success, and no need to change | |
124 } else if (ctxk1->is_subtype_of(ctxk2)) { | |
125 // new context class fully subsumes previous one | |
126 deps->at_put(ctxk_i, ctxk2); | |
127 return true; | |
128 } else { | |
129 return false; | |
130 } | |
131 } | |
132 | |
133 void Dependencies::assert_common_1(Dependencies::DepType dept, ciObject* x) { | |
134 assert(dep_args(dept) == 1, "sanity"); | |
135 log_dependency(dept, x); | |
136 GrowableArray<ciObject*>* deps = _deps[dept]; | |
137 | |
138 // see if the same (or a similar) dep is already recorded | |
139 if (note_dep_seen(dept, x)) { | |
140 assert(deps->find(x) >= 0, "sanity"); | |
141 } else { | |
142 deps->append(x); | |
143 } | |
144 } | |
145 | |
146 void Dependencies::assert_common_2(Dependencies::DepType dept, | |
147 ciKlass* ctxk, ciObject* x) { | |
148 assert(dep_context_arg(dept) == 0, "sanity"); | |
149 assert(dep_args(dept) == 2, "sanity"); | |
150 log_dependency(dept, ctxk, x); | |
151 GrowableArray<ciObject*>* deps = _deps[dept]; | |
152 | |
153 // see if the same (or a similar) dep is already recorded | |
154 if (note_dep_seen(dept, x)) { | |
155 // look in this bucket for redundant assertions | |
156 const int stride = 2; | |
157 for (int i = deps->length(); (i -= stride) >= 0; ) { | |
158 ciObject* x1 = deps->at(i+1); | |
159 if (x == x1) { // same subject; check the context | |
160 if (maybe_merge_ctxk(deps, i+0, ctxk)) { | |
161 return; | |
162 } | |
163 } | |
164 } | |
165 } | |
166 | |
167 // append the assertion in the correct bucket: | |
168 deps->append(ctxk); | |
169 deps->append(x); | |
170 } | |
171 | |
172 void Dependencies::assert_common_3(Dependencies::DepType dept, | |
173 ciKlass* ctxk, ciObject* x, ciObject* x2) { | |
174 assert(dep_context_arg(dept) == 0, "sanity"); | |
175 assert(dep_args(dept) == 3, "sanity"); | |
176 log_dependency(dept, ctxk, x, x2); | |
177 GrowableArray<ciObject*>* deps = _deps[dept]; | |
178 | |
179 // try to normalize an unordered pair: | |
180 bool swap = false; | |
181 switch (dept) { | |
182 case abstract_with_exclusive_concrete_subtypes_2: | |
183 swap = (x->ident() > x2->ident() && x != ctxk); | |
184 break; | |
185 case exclusive_concrete_methods_2: | |
186 swap = (x->ident() > x2->ident() && x->as_method()->holder() != ctxk); | |
187 break; | |
188 } | |
189 if (swap) { ciObject* t = x; x = x2; x2 = t; } | |
190 | |
191 // see if the same (or a similar) dep is already recorded | |
192 if (note_dep_seen(dept, x) && note_dep_seen(dept, x2)) { | |
193 // look in this bucket for redundant assertions | |
194 const int stride = 3; | |
195 for (int i = deps->length(); (i -= stride) >= 0; ) { | |
196 ciObject* y = deps->at(i+1); | |
197 ciObject* y2 = deps->at(i+2); | |
198 if (x == y && x2 == y2) { // same subjects; check the context | |
199 if (maybe_merge_ctxk(deps, i+0, ctxk)) { | |
200 return; | |
201 } | |
202 } | |
203 } | |
204 } | |
205 // append the assertion in the correct bucket: | |
206 deps->append(ctxk); | |
207 deps->append(x); | |
208 deps->append(x2); | |
209 } | |
210 | |
211 /// Support for encoding dependencies into an nmethod: | |
212 | |
213 void Dependencies::copy_to(nmethod* nm) { | |
214 address beg = nm->dependencies_begin(); | |
215 address end = nm->dependencies_end(); | |
216 guarantee(end - beg >= (ptrdiff_t) size_in_bytes(), "bad sizing"); | |
217 Copy::disjoint_words((HeapWord*) content_bytes(), | |
218 (HeapWord*) beg, | |
219 size_in_bytes() / sizeof(HeapWord)); | |
220 assert(size_in_bytes() % sizeof(HeapWord) == 0, "copy by words"); | |
221 } | |
222 | |
223 static int sort_dep(ciObject** p1, ciObject** p2, int narg) { | |
224 for (int i = 0; i < narg; i++) { | |
225 int diff = p1[i]->ident() - p2[i]->ident(); | |
226 if (diff != 0) return diff; | |
227 } | |
228 return 0; | |
229 } | |
230 static int sort_dep_arg_1(ciObject** p1, ciObject** p2) | |
231 { return sort_dep(p1, p2, 1); } | |
232 static int sort_dep_arg_2(ciObject** p1, ciObject** p2) | |
233 { return sort_dep(p1, p2, 2); } | |
234 static int sort_dep_arg_3(ciObject** p1, ciObject** p2) | |
235 { return sort_dep(p1, p2, 3); } | |
236 | |
237 void Dependencies::sort_all_deps() { | |
238 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { | |
239 DepType dept = (DepType)deptv; | |
240 GrowableArray<ciObject*>* deps = _deps[dept]; | |
241 if (deps->length() <= 1) continue; | |
242 switch (dep_args(dept)) { | |
243 case 1: deps->sort(sort_dep_arg_1, 1); break; | |
244 case 2: deps->sort(sort_dep_arg_2, 2); break; | |
245 case 3: deps->sort(sort_dep_arg_3, 3); break; | |
246 default: ShouldNotReachHere(); | |
247 } | |
248 } | |
249 } | |
250 | |
251 size_t Dependencies::estimate_size_in_bytes() { | |
252 size_t est_size = 100; | |
253 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { | |
254 DepType dept = (DepType)deptv; | |
255 GrowableArray<ciObject*>* deps = _deps[dept]; | |
256 est_size += deps->length()*2; // tags and argument(s) | |
257 } | |
258 return est_size; | |
259 } | |
260 | |
261 ciKlass* Dependencies::ctxk_encoded_as_null(DepType dept, ciObject* x) { | |
262 switch (dept) { | |
263 case abstract_with_exclusive_concrete_subtypes_2: | |
264 return x->as_klass(); | |
265 case unique_concrete_method: | |
266 case exclusive_concrete_methods_2: | |
267 return x->as_method()->holder(); | |
268 } | |
269 return NULL; // let NULL be NULL | |
270 } | |
271 | |
272 klassOop Dependencies::ctxk_encoded_as_null(DepType dept, oop x) { | |
273 assert(must_be_in_vm(), "raw oops here"); | |
274 switch (dept) { | |
275 case abstract_with_exclusive_concrete_subtypes_2: | |
276 assert(x->is_klass(), "sanity"); | |
277 return (klassOop) x; | |
278 case unique_concrete_method: | |
279 case exclusive_concrete_methods_2: | |
280 assert(x->is_method(), "sanity"); | |
281 return ((methodOop)x)->method_holder(); | |
282 } | |
283 return NULL; // let NULL be NULL | |
284 } | |
285 | |
286 void Dependencies::encode_content_bytes() { | |
287 sort_all_deps(); | |
288 | |
289 // cast is safe, no deps can overflow INT_MAX | |
290 CompressedWriteStream bytes((int)estimate_size_in_bytes()); | |
291 | |
292 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { | |
293 DepType dept = (DepType)deptv; | |
294 GrowableArray<ciObject*>* deps = _deps[dept]; | |
295 if (deps->length() == 0) continue; | |
296 int stride = dep_args(dept); | |
297 int ctxkj = dep_context_arg(dept); // -1 if no context arg | |
298 assert(stride > 0, "sanity"); | |
299 for (int i = 0; i < deps->length(); i += stride) { | |
300 jbyte code_byte = (jbyte)dept; | |
301 int skipj = -1; | |
302 if (ctxkj >= 0 && ctxkj+1 < stride) { | |
303 ciKlass* ctxk = deps->at(i+ctxkj+0)->as_klass(); | |
304 ciObject* x = deps->at(i+ctxkj+1); // following argument | |
305 if (ctxk == ctxk_encoded_as_null(dept, x)) { | |
306 skipj = ctxkj; // we win: maybe one less oop to keep track of | |
307 code_byte |= default_context_type_bit; | |
308 } | |
309 } | |
310 bytes.write_byte(code_byte); | |
311 for (int j = 0; j < stride; j++) { | |
312 if (j == skipj) continue; | |
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313 bytes.write_int(_oop_recorder->find_index(deps->at(i+j)->constant_encoding())); |
0 | 314 } |
315 } | |
316 } | |
317 | |
318 // write a sentinel byte to mark the end | |
319 bytes.write_byte(end_marker); | |
320 | |
321 // round it out to a word boundary | |
322 while (bytes.position() % sizeof(HeapWord) != 0) { | |
323 bytes.write_byte(end_marker); | |
324 } | |
325 | |
326 // check whether the dept byte encoding really works | |
327 assert((jbyte)default_context_type_bit != 0, "byte overflow"); | |
328 | |
329 _content_bytes = bytes.buffer(); | |
330 _size_in_bytes = bytes.position(); | |
331 } | |
332 | |
333 | |
334 const char* Dependencies::_dep_name[TYPE_LIMIT] = { | |
335 "end_marker", | |
336 "evol_method", | |
337 "leaf_type", | |
338 "abstract_with_unique_concrete_subtype", | |
339 "abstract_with_no_concrete_subtype", | |
340 "concrete_with_no_concrete_subtype", | |
341 "unique_concrete_method", | |
342 "abstract_with_exclusive_concrete_subtypes_2", | |
343 "exclusive_concrete_methods_2", | |
344 "no_finalizable_subclasses" | |
345 }; | |
346 | |
347 int Dependencies::_dep_args[TYPE_LIMIT] = { | |
348 -1,// end_marker | |
349 1, // evol_method m | |
350 1, // leaf_type ctxk | |
351 2, // abstract_with_unique_concrete_subtype ctxk, k | |
352 1, // abstract_with_no_concrete_subtype ctxk | |
353 1, // concrete_with_no_concrete_subtype ctxk | |
354 2, // unique_concrete_method ctxk, m | |
355 3, // unique_concrete_subtypes_2 ctxk, k1, k2 | |
356 3, // unique_concrete_methods_2 ctxk, m1, m2 | |
357 1 // no_finalizable_subclasses ctxk | |
358 }; | |
359 | |
360 const char* Dependencies::dep_name(Dependencies::DepType dept) { | |
361 if (!dept_in_mask(dept, all_types)) return "?bad-dep?"; | |
362 return _dep_name[dept]; | |
363 } | |
364 | |
365 int Dependencies::dep_args(Dependencies::DepType dept) { | |
366 if (!dept_in_mask(dept, all_types)) return -1; | |
367 return _dep_args[dept]; | |
368 } | |
369 | |
370 // for the sake of the compiler log, print out current dependencies: | |
371 void Dependencies::log_all_dependencies() { | |
372 if (log() == NULL) return; | |
373 ciObject* args[max_arg_count]; | |
374 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { | |
375 DepType dept = (DepType)deptv; | |
376 GrowableArray<ciObject*>* deps = _deps[dept]; | |
377 if (deps->length() == 0) continue; | |
378 int stride = dep_args(dept); | |
379 for (int i = 0; i < deps->length(); i += stride) { | |
380 for (int j = 0; j < stride; j++) { | |
381 // flush out the identities before printing | |
382 args[j] = deps->at(i+j); | |
383 } | |
384 write_dependency_to(log(), dept, stride, args); | |
385 } | |
386 } | |
387 } | |
388 | |
389 void Dependencies::write_dependency_to(CompileLog* log, | |
390 DepType dept, | |
391 int nargs, oop args[], | |
392 klassOop witness) { | |
393 if (log == NULL) { | |
394 return; | |
395 } | |
396 ciEnv* env = ciEnv::current(); | |
397 ciObject* ciargs[max_arg_count]; | |
398 assert(nargs <= max_arg_count, "oob"); | |
399 for (int j = 0; j < nargs; j++) { | |
400 ciargs[j] = env->get_object(args[j]); | |
401 } | |
402 Dependencies::write_dependency_to(log, dept, nargs, ciargs, witness); | |
403 } | |
404 | |
405 void Dependencies::write_dependency_to(CompileLog* log, | |
406 DepType dept, | |
407 int nargs, ciObject* args[], | |
408 klassOop witness) { | |
409 if (log == NULL) return; | |
410 assert(nargs <= max_arg_count, "oob"); | |
411 int argids[max_arg_count]; | |
412 int ctxkj = dep_context_arg(dept); // -1 if no context arg | |
413 int j; | |
414 for (j = 0; j < nargs; j++) { | |
415 argids[j] = log->identify(args[j]); | |
416 } | |
417 if (witness != NULL) { | |
418 log->begin_elem("dependency_failed"); | |
419 } else { | |
420 log->begin_elem("dependency"); | |
421 } | |
422 log->print(" type='%s'", dep_name(dept)); | |
423 if (ctxkj >= 0) { | |
424 log->print(" ctxk='%d'", argids[ctxkj]); | |
425 } | |
426 // write remaining arguments, if any. | |
427 for (j = 0; j < nargs; j++) { | |
428 if (j == ctxkj) continue; // already logged | |
429 if (j == 1) { | |
430 log->print( " x='%d'", argids[j]); | |
431 } else { | |
432 log->print(" x%d='%d'", j, argids[j]); | |
433 } | |
434 } | |
435 if (witness != NULL) { | |
436 log->object("witness", witness); | |
437 log->stamp(); | |
438 } | |
439 log->end_elem(); | |
440 } | |
441 | |
442 void Dependencies::write_dependency_to(xmlStream* xtty, | |
443 DepType dept, | |
444 int nargs, oop args[], | |
445 klassOop witness) { | |
446 if (xtty == NULL) return; | |
447 ttyLocker ttyl; | |
448 int ctxkj = dep_context_arg(dept); // -1 if no context arg | |
449 if (witness != NULL) { | |
450 xtty->begin_elem("dependency_failed"); | |
451 } else { | |
452 xtty->begin_elem("dependency"); | |
453 } | |
454 xtty->print(" type='%s'", dep_name(dept)); | |
455 if (ctxkj >= 0) { | |
456 xtty->object("ctxk", args[ctxkj]); | |
457 } | |
458 // write remaining arguments, if any. | |
459 for (int j = 0; j < nargs; j++) { | |
460 if (j == ctxkj) continue; // already logged | |
461 if (j == 1) { | |
462 xtty->object("x", args[j]); | |
463 } else { | |
464 char xn[10]; sprintf(xn, "x%d", j); | |
465 xtty->object(xn, args[j]); | |
466 } | |
467 } | |
468 if (witness != NULL) { | |
469 xtty->object("witness", witness); | |
470 xtty->stamp(); | |
471 } | |
472 xtty->end_elem(); | |
473 } | |
474 | |
475 void Dependencies::print_dependency(DepType dept, int nargs, oop args[], | |
476 klassOop witness) { | |
477 ResourceMark rm; | |
478 ttyLocker ttyl; // keep the following output all in one block | |
479 tty->print_cr("%s of type %s", | |
480 (witness == NULL)? "Dependency": "Failed dependency", | |
481 dep_name(dept)); | |
482 // print arguments | |
483 int ctxkj = dep_context_arg(dept); // -1 if no context arg | |
484 for (int j = 0; j < nargs; j++) { | |
485 oop arg = args[j]; | |
486 bool put_star = false; | |
487 if (arg == NULL) continue; | |
488 const char* what; | |
489 if (j == ctxkj) { | |
490 what = "context"; | |
491 put_star = !Dependencies::is_concrete_klass((klassOop)arg); | |
492 } else if (arg->is_method()) { | |
493 what = "method "; | |
494 put_star = !Dependencies::is_concrete_method((methodOop)arg); | |
495 } else if (arg->is_klass()) { | |
496 what = "class "; | |
497 } else { | |
498 what = "object "; | |
499 } | |
500 tty->print(" %s = %s", what, (put_star? "*": "")); | |
501 if (arg->is_klass()) | |
502 tty->print("%s", Klass::cast((klassOop)arg)->external_name()); | |
503 else | |
504 arg->print_value(); | |
505 tty->cr(); | |
506 } | |
507 if (witness != NULL) { | |
508 bool put_star = !Dependencies::is_concrete_klass(witness); | |
509 tty->print_cr(" witness = %s%s", | |
510 (put_star? "*": ""), | |
511 Klass::cast(witness)->external_name()); | |
512 } | |
513 } | |
514 | |
515 void Dependencies::DepStream::log_dependency(klassOop witness) { | |
516 if (_deps == NULL && xtty == NULL) return; // fast cutout for runtime | |
517 int nargs = argument_count(); | |
518 oop args[max_arg_count]; | |
519 for (int j = 0; j < nargs; j++) { | |
520 args[j] = argument(j); | |
521 } | |
522 if (_deps != NULL && _deps->log() != NULL) { | |
523 Dependencies::write_dependency_to(_deps->log(), | |
524 type(), nargs, args, witness); | |
525 } else { | |
526 Dependencies::write_dependency_to(xtty, | |
527 type(), nargs, args, witness); | |
528 } | |
529 } | |
530 | |
531 void Dependencies::DepStream::print_dependency(klassOop witness, bool verbose) { | |
532 int nargs = argument_count(); | |
533 oop args[max_arg_count]; | |
534 for (int j = 0; j < nargs; j++) { | |
535 args[j] = argument(j); | |
536 } | |
537 Dependencies::print_dependency(type(), nargs, args, witness); | |
538 if (verbose) { | |
539 if (_code != NULL) { | |
540 tty->print(" code: "); | |
541 _code->print_value_on(tty); | |
542 tty->cr(); | |
543 } | |
544 } | |
545 } | |
546 | |
547 | |
548 /// Dependency stream support (decodes dependencies from an nmethod): | |
549 | |
550 #ifdef ASSERT | |
551 void Dependencies::DepStream::initial_asserts(size_t byte_limit) { | |
552 assert(must_be_in_vm(), "raw oops here"); | |
553 _byte_limit = byte_limit; | |
554 _type = (DepType)(end_marker-1); // defeat "already at end" assert | |
555 assert((_code!=NULL) + (_deps!=NULL) == 1, "one or t'other"); | |
556 } | |
557 #endif //ASSERT | |
558 | |
559 bool Dependencies::DepStream::next() { | |
560 assert(_type != end_marker, "already at end"); | |
561 if (_bytes.position() == 0 && _code != NULL | |
562 && _code->dependencies_size() == 0) { | |
563 // Method has no dependencies at all. | |
564 return false; | |
565 } | |
566 int code_byte = (_bytes.read_byte() & 0xFF); | |
567 if (code_byte == end_marker) { | |
568 DEBUG_ONLY(_type = end_marker); | |
569 return false; | |
570 } else { | |
571 int ctxk_bit = (code_byte & Dependencies::default_context_type_bit); | |
572 code_byte -= ctxk_bit; | |
573 DepType dept = (DepType)code_byte; | |
574 _type = dept; | |
575 guarantee((dept - FIRST_TYPE) < (TYPE_LIMIT - FIRST_TYPE), | |
576 "bad dependency type tag"); | |
577 int stride = _dep_args[dept]; | |
578 assert(stride == dep_args(dept), "sanity"); | |
579 int skipj = -1; | |
580 if (ctxk_bit != 0) { | |
581 skipj = 0; // currently the only context argument is at zero | |
582 assert(skipj == dep_context_arg(dept), "zero arg always ctxk"); | |
583 } | |
584 for (int j = 0; j < stride; j++) { | |
585 _xi[j] = (j == skipj)? 0: _bytes.read_int(); | |
586 } | |
587 DEBUG_ONLY(_xi[stride] = -1); // help detect overruns | |
588 return true; | |
589 } | |
590 } | |
591 | |
592 inline oop Dependencies::DepStream::recorded_oop_at(int i) { | |
593 return (_code != NULL) | |
594 ? _code->oop_at(i) | |
595 : JNIHandles::resolve(_deps->oop_recorder()->handle_at(i)); | |
596 } | |
597 | |
598 oop Dependencies::DepStream::argument(int i) { | |
599 return recorded_oop_at(argument_index(i)); | |
600 } | |
601 | |
602 klassOop Dependencies::DepStream::context_type() { | |
603 assert(must_be_in_vm(), "raw oops here"); | |
604 int ctxkj = dep_context_arg(_type); // -1 if no context arg | |
605 if (ctxkj < 0) { | |
606 return NULL; // for example, evol_method | |
607 } else { | |
608 oop k = recorded_oop_at(_xi[ctxkj]); | |
609 if (k != NULL) { // context type was not compressed away | |
610 assert(k->is_klass(), "type check"); | |
611 return (klassOop) k; | |
612 } else { // recompute "default" context type | |
613 return ctxk_encoded_as_null(_type, recorded_oop_at(_xi[ctxkj+1])); | |
614 } | |
615 } | |
616 } | |
617 | |
618 /// Checking dependencies: | |
619 | |
620 // This hierarchy walker inspects subtypes of a given type, | |
621 // trying to find a "bad" class which breaks a dependency. | |
622 // Such a class is called a "witness" to the broken dependency. | |
623 // While searching around, we ignore "participants", which | |
624 // are already known to the dependency. | |
625 class ClassHierarchyWalker { | |
626 public: | |
627 enum { PARTICIPANT_LIMIT = 3 }; | |
628 | |
629 private: | |
630 // optional method descriptor to check for: | |
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631 Symbol* _name; |
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632 Symbol* _signature; |
0 | 633 |
634 // special classes which are not allowed to be witnesses: | |
635 klassOop _participants[PARTICIPANT_LIMIT+1]; | |
636 int _num_participants; | |
637 | |
638 // cache of method lookups | |
639 methodOop _found_methods[PARTICIPANT_LIMIT+1]; | |
640 | |
641 // if non-zero, tells how many witnesses to convert to participants | |
642 int _record_witnesses; | |
643 | |
644 void initialize(klassOop participant) { | |
645 _record_witnesses = 0; | |
646 _participants[0] = participant; | |
647 _found_methods[0] = NULL; | |
648 _num_participants = 0; | |
649 if (participant != NULL) { | |
650 // Terminating NULL. | |
651 _participants[1] = NULL; | |
652 _found_methods[1] = NULL; | |
653 _num_participants = 1; | |
654 } | |
655 } | |
656 | |
657 void initialize_from_method(methodOop m) { | |
658 assert(m != NULL && m->is_method(), "sanity"); | |
659 _name = m->name(); | |
660 _signature = m->signature(); | |
661 } | |
662 | |
663 public: | |
664 // The walker is initialized to recognize certain methods and/or types | |
665 // as friendly participants. | |
666 ClassHierarchyWalker(klassOop participant, methodOop m) { | |
667 initialize_from_method(m); | |
668 initialize(participant); | |
669 } | |
670 ClassHierarchyWalker(methodOop m) { | |
671 initialize_from_method(m); | |
672 initialize(NULL); | |
673 } | |
674 ClassHierarchyWalker(klassOop participant = NULL) { | |
675 _name = NULL; | |
676 _signature = NULL; | |
677 initialize(participant); | |
678 } | |
679 | |
680 // This is common code for two searches: One for concrete subtypes, | |
681 // the other for concrete method implementations and overrides. | |
682 bool doing_subtype_search() { | |
683 return _name == NULL; | |
684 } | |
685 | |
686 int num_participants() { return _num_participants; } | |
687 klassOop participant(int n) { | |
688 assert((uint)n <= (uint)_num_participants, "oob"); | |
689 return _participants[n]; | |
690 } | |
691 | |
692 // Note: If n==num_participants, returns NULL. | |
693 methodOop found_method(int n) { | |
694 assert((uint)n <= (uint)_num_participants, "oob"); | |
695 methodOop fm = _found_methods[n]; | |
696 assert(n == _num_participants || fm != NULL, "proper usage"); | |
697 assert(fm == NULL || fm->method_holder() == _participants[n], "sanity"); | |
698 return fm; | |
699 } | |
700 | |
701 #ifdef ASSERT | |
702 // Assert that m is inherited into ctxk, without intervening overrides. | |
703 // (May return true even if this is not true, in corner cases where we punt.) | |
704 bool check_method_context(klassOop ctxk, methodOop m) { | |
705 if (m->method_holder() == ctxk) | |
706 return true; // Quick win. | |
707 if (m->is_private()) | |
708 return false; // Quick lose. Should not happen. | |
709 if (!(m->is_public() || m->is_protected())) | |
710 // The override story is complex when packages get involved. | |
711 return true; // Must punt the assertion to true. | |
712 Klass* k = Klass::cast(ctxk); | |
713 methodOop lm = k->lookup_method(m->name(), m->signature()); | |
714 if (lm == NULL && k->oop_is_instance()) { | |
715 // It might be an abstract interface method, devoid of mirandas. | |
716 lm = ((instanceKlass*)k)->lookup_method_in_all_interfaces(m->name(), | |
717 m->signature()); | |
718 } | |
719 if (lm == m) | |
720 // Method m is inherited into ctxk. | |
721 return true; | |
722 if (lm != NULL) { | |
723 if (!(lm->is_public() || lm->is_protected())) | |
724 // Method is [package-]private, so the override story is complex. | |
725 return true; // Must punt the assertion to true. | |
726 if ( !Dependencies::is_concrete_method(lm) | |
727 && !Dependencies::is_concrete_method(m) | |
728 && Klass::cast(lm->method_holder())->is_subtype_of(m->method_holder())) | |
729 // Method m is overridden by lm, but both are non-concrete. | |
730 return true; | |
731 } | |
732 ResourceMark rm; | |
733 tty->print_cr("Dependency method not found in the associated context:"); | |
734 tty->print_cr(" context = %s", Klass::cast(ctxk)->external_name()); | |
735 tty->print( " method = "); m->print_short_name(tty); tty->cr(); | |
736 if (lm != NULL) { | |
737 tty->print( " found = "); lm->print_short_name(tty); tty->cr(); | |
738 } | |
739 return false; | |
740 } | |
741 #endif | |
742 | |
743 void add_participant(klassOop participant) { | |
744 assert(_num_participants + _record_witnesses < PARTICIPANT_LIMIT, "oob"); | |
745 int np = _num_participants++; | |
746 _participants[np] = participant; | |
747 _participants[np+1] = NULL; | |
748 _found_methods[np+1] = NULL; | |
749 } | |
750 | |
751 void record_witnesses(int add) { | |
752 if (add > PARTICIPANT_LIMIT) add = PARTICIPANT_LIMIT; | |
753 assert(_num_participants + add < PARTICIPANT_LIMIT, "oob"); | |
754 _record_witnesses = add; | |
755 } | |
756 | |
757 bool is_witness(klassOop k) { | |
758 if (doing_subtype_search()) { | |
759 return Dependencies::is_concrete_klass(k); | |
760 } else { | |
761 methodOop m = instanceKlass::cast(k)->find_method(_name, _signature); | |
762 if (m == NULL || !Dependencies::is_concrete_method(m)) return false; | |
763 _found_methods[_num_participants] = m; | |
764 // Note: If add_participant(k) is called, | |
765 // the method m will already be memoized for it. | |
766 return true; | |
767 } | |
768 } | |
769 | |
770 bool is_participant(klassOop k) { | |
771 if (k == _participants[0]) { | |
772 return true; | |
773 } else if (_num_participants <= 1) { | |
774 return false; | |
775 } else { | |
776 return in_list(k, &_participants[1]); | |
777 } | |
778 } | |
779 bool ignore_witness(klassOop witness) { | |
780 if (_record_witnesses == 0) { | |
781 return false; | |
782 } else { | |
783 --_record_witnesses; | |
784 add_participant(witness); | |
785 return true; | |
786 } | |
787 } | |
788 static bool in_list(klassOop x, klassOop* list) { | |
789 for (int i = 0; ; i++) { | |
790 klassOop y = list[i]; | |
791 if (y == NULL) break; | |
792 if (y == x) return true; | |
793 } | |
794 return false; // not in list | |
795 } | |
796 | |
797 private: | |
798 // the actual search method: | |
799 klassOop find_witness_anywhere(klassOop context_type, | |
800 bool participants_hide_witnesses, | |
801 bool top_level_call = true); | |
802 // the spot-checking version: | |
803 klassOop find_witness_in(DepChange& changes, | |
804 klassOop context_type, | |
805 bool participants_hide_witnesses); | |
806 public: | |
807 klassOop find_witness_subtype(klassOop context_type, DepChange* changes = NULL) { | |
808 assert(doing_subtype_search(), "must set up a subtype search"); | |
809 // When looking for unexpected concrete types, | |
810 // do not look beneath expected ones. | |
811 const bool participants_hide_witnesses = true; | |
812 // CX > CC > C' is OK, even if C' is new. | |
813 // CX > { CC, C' } is not OK if C' is new, and C' is the witness. | |
814 if (changes != NULL) { | |
815 return find_witness_in(*changes, context_type, participants_hide_witnesses); | |
816 } else { | |
817 return find_witness_anywhere(context_type, participants_hide_witnesses); | |
818 } | |
819 } | |
820 klassOop find_witness_definer(klassOop context_type, DepChange* changes = NULL) { | |
821 assert(!doing_subtype_search(), "must set up a method definer search"); | |
822 // When looking for unexpected concrete methods, | |
823 // look beneath expected ones, to see if there are overrides. | |
824 const bool participants_hide_witnesses = true; | |
825 // CX.m > CC.m > C'.m is not OK, if C'.m is new, and C' is the witness. | |
826 if (changes != NULL) { | |
827 return find_witness_in(*changes, context_type, !participants_hide_witnesses); | |
828 } else { | |
829 return find_witness_anywhere(context_type, !participants_hide_witnesses); | |
830 } | |
831 } | |
832 }; | |
833 | |
834 #ifndef PRODUCT | |
835 static int deps_find_witness_calls = 0; | |
836 static int deps_find_witness_steps = 0; | |
837 static int deps_find_witness_recursions = 0; | |
838 static int deps_find_witness_singles = 0; | |
839 static int deps_find_witness_print = 0; // set to -1 to force a final print | |
840 static bool count_find_witness_calls() { | |
841 if (TraceDependencies || LogCompilation) { | |
842 int pcount = deps_find_witness_print + 1; | |
843 bool final_stats = (pcount == 0); | |
844 bool initial_call = (pcount == 1); | |
845 bool occasional_print = ((pcount & ((1<<10) - 1)) == 0); | |
846 if (pcount < 0) pcount = 1; // crude overflow protection | |
847 deps_find_witness_print = pcount; | |
848 if (VerifyDependencies && initial_call) { | |
849 tty->print_cr("Warning: TraceDependencies results may be inflated by VerifyDependencies"); | |
850 } | |
851 if (occasional_print || final_stats) { | |
852 // Every now and then dump a little info about dependency searching. | |
853 if (xtty != NULL) { | |
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854 ttyLocker ttyl; |
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855 xtty->elem("deps_find_witness calls='%d' steps='%d' recursions='%d' singles='%d'", |
0 | 856 deps_find_witness_calls, |
857 deps_find_witness_steps, | |
858 deps_find_witness_recursions, | |
859 deps_find_witness_singles); | |
860 } | |
861 if (final_stats || (TraceDependencies && WizardMode)) { | |
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862 ttyLocker ttyl; |
0 | 863 tty->print_cr("Dependency check (find_witness) " |
864 "calls=%d, steps=%d (avg=%.1f), recursions=%d, singles=%d", | |
865 deps_find_witness_calls, | |
866 deps_find_witness_steps, | |
867 (double)deps_find_witness_steps / deps_find_witness_calls, | |
868 deps_find_witness_recursions, | |
869 deps_find_witness_singles); | |
870 } | |
871 } | |
872 return true; | |
873 } | |
874 return false; | |
875 } | |
876 #else | |
877 #define count_find_witness_calls() (0) | |
878 #endif //PRODUCT | |
879 | |
880 | |
881 klassOop ClassHierarchyWalker::find_witness_in(DepChange& changes, | |
882 klassOop context_type, | |
883 bool participants_hide_witnesses) { | |
884 assert(changes.involves_context(context_type), "irrelevant dependency"); | |
885 klassOop new_type = changes.new_type(); | |
886 | |
887 count_find_witness_calls(); | |
888 NOT_PRODUCT(deps_find_witness_singles++); | |
889 | |
890 // Current thread must be in VM (not native mode, as in CI): | |
891 assert(must_be_in_vm(), "raw oops here"); | |
892 // Must not move the class hierarchy during this check: | |
893 assert_locked_or_safepoint(Compile_lock); | |
894 | |
30 | 895 int nof_impls = instanceKlass::cast(context_type)->nof_implementors(); |
896 if (nof_impls > 1) { | |
897 // Avoid this case: *I.m > { A.m, C }; B.m > C | |
898 // %%% Until this is fixed more systematically, bail out. | |
899 // See corresponding comment in find_witness_anywhere. | |
900 return context_type; | |
901 } | |
902 | |
0 | 903 assert(!is_participant(new_type), "only old classes are participants"); |
904 if (participants_hide_witnesses) { | |
905 // If the new type is a subtype of a participant, we are done. | |
906 for (int i = 0; i < num_participants(); i++) { | |
907 klassOop part = participant(i); | |
908 if (part == NULL) continue; | |
909 assert(changes.involves_context(part) == Klass::cast(new_type)->is_subtype_of(part), | |
910 "correct marking of participants, b/c new_type is unique"); | |
911 if (changes.involves_context(part)) { | |
912 // new guy is protected from this check by previous participant | |
913 return NULL; | |
914 } | |
915 } | |
916 } | |
917 | |
918 if (is_witness(new_type) && | |
919 !ignore_witness(new_type)) { | |
920 return new_type; | |
921 } | |
922 | |
923 return NULL; | |
924 } | |
925 | |
926 | |
927 // Walk hierarchy under a context type, looking for unexpected types. | |
928 // Do not report participant types, and recursively walk beneath | |
929 // them only if participants_hide_witnesses is false. | |
930 // If top_level_call is false, skip testing the context type, | |
931 // because the caller has already considered it. | |
932 klassOop ClassHierarchyWalker::find_witness_anywhere(klassOop context_type, | |
933 bool participants_hide_witnesses, | |
934 bool top_level_call) { | |
935 // Current thread must be in VM (not native mode, as in CI): | |
936 assert(must_be_in_vm(), "raw oops here"); | |
937 // Must not move the class hierarchy during this check: | |
938 assert_locked_or_safepoint(Compile_lock); | |
939 | |
940 bool do_counts = count_find_witness_calls(); | |
941 | |
942 // Check the root of the sub-hierarchy first. | |
943 if (top_level_call) { | |
944 if (do_counts) { | |
945 NOT_PRODUCT(deps_find_witness_calls++); | |
946 NOT_PRODUCT(deps_find_witness_steps++); | |
947 } | |
948 if (is_participant(context_type)) { | |
949 if (participants_hide_witnesses) return NULL; | |
950 // else fall through to search loop... | |
951 } else if (is_witness(context_type) && !ignore_witness(context_type)) { | |
952 // The context is an abstract class or interface, to start with. | |
953 return context_type; | |
954 } | |
955 } | |
956 | |
957 // Now we must check each implementor and each subclass. | |
958 // Use a short worklist to avoid blowing the stack. | |
959 // Each worklist entry is a *chain* of subklass siblings to process. | |
960 const int CHAINMAX = 100; // >= 1 + instanceKlass::implementors_limit | |
961 Klass* chains[CHAINMAX]; | |
962 int chaini = 0; // index into worklist | |
963 Klass* chain; // scratch variable | |
964 #define ADD_SUBCLASS_CHAIN(k) { \ | |
965 assert(chaini < CHAINMAX, "oob"); \ | |
966 chain = instanceKlass::cast(k)->subklass(); \ | |
967 if (chain != NULL) chains[chaini++] = chain; } | |
968 | |
969 // Look for non-abstract subclasses. | |
970 // (Note: Interfaces do not have subclasses.) | |
971 ADD_SUBCLASS_CHAIN(context_type); | |
972 | |
973 // If it is an interface, search its direct implementors. | |
974 // (Their subclasses are additional indirect implementors. | |
975 // See instanceKlass::add_implementor.) | |
976 // (Note: nof_implementors is always zero for non-interfaces.) | |
977 int nof_impls = instanceKlass::cast(context_type)->nof_implementors(); | |
978 if (nof_impls > 1) { | |
979 // Avoid this case: *I.m > { A.m, C }; B.m > C | |
980 // Here, I.m has 2 concrete implementations, but m appears unique | |
981 // as A.m, because the search misses B.m when checking C. | |
982 // The inherited method B.m was getting missed by the walker | |
983 // when interface 'I' was the starting point. | |
984 // %%% Until this is fixed more systematically, bail out. | |
985 // (Old CHA had the same limitation.) | |
986 return context_type; | |
987 } | |
988 for (int i = 0; i < nof_impls; i++) { | |
989 klassOop impl = instanceKlass::cast(context_type)->implementor(i); | |
990 if (impl == NULL) { | |
991 // implementors array overflowed => no exact info. | |
992 return context_type; // report an inexact witness to this sad affair | |
993 } | |
994 if (do_counts) | |
995 { NOT_PRODUCT(deps_find_witness_steps++); } | |
996 if (is_participant(impl)) { | |
997 if (participants_hide_witnesses) continue; | |
998 // else fall through to process this guy's subclasses | |
999 } else if (is_witness(impl) && !ignore_witness(impl)) { | |
1000 return impl; | |
1001 } | |
1002 ADD_SUBCLASS_CHAIN(impl); | |
1003 } | |
1004 | |
1005 // Recursively process each non-trivial sibling chain. | |
1006 while (chaini > 0) { | |
1007 Klass* chain = chains[--chaini]; | |
1008 for (Klass* subk = chain; subk != NULL; subk = subk->next_sibling()) { | |
1009 klassOop sub = subk->as_klassOop(); | |
1010 if (do_counts) { NOT_PRODUCT(deps_find_witness_steps++); } | |
1011 if (is_participant(sub)) { | |
1012 if (participants_hide_witnesses) continue; | |
1013 // else fall through to process this guy's subclasses | |
1014 } else if (is_witness(sub) && !ignore_witness(sub)) { | |
1015 return sub; | |
1016 } | |
1017 if (chaini < (VerifyDependencies? 2: CHAINMAX)) { | |
1018 // Fast path. (Partially disabled if VerifyDependencies.) | |
1019 ADD_SUBCLASS_CHAIN(sub); | |
1020 } else { | |
1021 // Worklist overflow. Do a recursive call. Should be rare. | |
1022 // The recursive call will have its own worklist, of course. | |
1023 // (Note that sub has already been tested, so that there is | |
1024 // no need for the recursive call to re-test. That's handy, | |
1025 // since the recursive call sees sub as the context_type.) | |
1026 if (do_counts) { NOT_PRODUCT(deps_find_witness_recursions++); } | |
1027 klassOop witness = find_witness_anywhere(sub, | |
1028 participants_hide_witnesses, | |
1029 /*top_level_call=*/ false); | |
1030 if (witness != NULL) return witness; | |
1031 } | |
1032 } | |
1033 } | |
1034 | |
1035 // No witness found. The dependency remains unbroken. | |
1036 return NULL; | |
1037 #undef ADD_SUBCLASS_CHAIN | |
1038 } | |
1039 | |
1040 | |
1041 bool Dependencies::is_concrete_klass(klassOop k) { | |
1042 if (Klass::cast(k)->is_abstract()) return false; | |
1043 // %%% We could treat classes which are concrete but | |
1044 // have not yet been instantiated as virtually abstract. | |
1045 // This would require a deoptimization barrier on first instantiation. | |
1046 //if (k->is_not_instantiated()) return false; | |
1047 return true; | |
1048 } | |
1049 | |
1050 bool Dependencies::is_concrete_method(methodOop m) { | |
1051 if (m->is_abstract()) return false; | |
1052 // %%% We could treat unexecuted methods as virtually abstract also. | |
1053 // This would require a deoptimization barrier on first execution. | |
1054 return !m->is_abstract(); | |
1055 } | |
1056 | |
1057 | |
1058 Klass* Dependencies::find_finalizable_subclass(Klass* k) { | |
1059 if (k->is_interface()) return NULL; | |
1060 if (k->has_finalizer()) return k; | |
1061 k = k->subklass(); | |
1062 while (k != NULL) { | |
1063 Klass* result = find_finalizable_subclass(k); | |
1064 if (result != NULL) return result; | |
1065 k = k->next_sibling(); | |
1066 } | |
1067 return NULL; | |
1068 } | |
1069 | |
1070 | |
1071 bool Dependencies::is_concrete_klass(ciInstanceKlass* k) { | |
1072 if (k->is_abstract()) return false; | |
1073 // We could return also false if k does not yet appear to be | |
1074 // instantiated, if the VM version supports this distinction also. | |
1075 //if (k->is_not_instantiated()) return false; | |
1076 return true; | |
1077 } | |
1078 | |
1079 bool Dependencies::is_concrete_method(ciMethod* m) { | |
1080 // Statics are irrelevant to virtual call sites. | |
1081 if (m->is_static()) return false; | |
1082 | |
1083 // We could return also false if m does not yet appear to be | |
1084 // executed, if the VM version supports this distinction also. | |
1085 return !m->is_abstract(); | |
1086 } | |
1087 | |
1088 | |
1089 bool Dependencies::has_finalizable_subclass(ciInstanceKlass* k) { | |
1090 return k->has_finalizable_subclass(); | |
1091 } | |
1092 | |
1093 | |
1094 // Any use of the contents (bytecodes) of a method must be | |
1095 // marked by an "evol_method" dependency, if those contents | |
1096 // can change. (Note: A method is always dependent on itself.) | |
1097 klassOop Dependencies::check_evol_method(methodOop m) { | |
1098 assert(must_be_in_vm(), "raw oops here"); | |
1099 // Did somebody do a JVMTI RedefineClasses while our backs were turned? | |
1100 // Or is there a now a breakpoint? | |
1101 // (Assumes compiled code cannot handle bkpts; change if UseFastBreakpoints.) | |
1102 if (m->is_old() | |
1103 || m->number_of_breakpoints() > 0) { | |
1104 return m->method_holder(); | |
1105 } else { | |
1106 return NULL; | |
1107 } | |
1108 } | |
1109 | |
1110 // This is a strong assertion: It is that the given type | |
1111 // has no subtypes whatever. It is most useful for | |
1112 // optimizing checks on reflected types or on array types. | |
1113 // (Checks on types which are derived from real instances | |
1114 // can be optimized more strongly than this, because we | |
1115 // know that the checked type comes from a concrete type, | |
1116 // and therefore we can disregard abstract types.) | |
1117 klassOop Dependencies::check_leaf_type(klassOop ctxk) { | |
1118 assert(must_be_in_vm(), "raw oops here"); | |
1119 assert_locked_or_safepoint(Compile_lock); | |
1120 instanceKlass* ctx = instanceKlass::cast(ctxk); | |
1121 Klass* sub = ctx->subklass(); | |
1122 if (sub != NULL) { | |
1123 return sub->as_klassOop(); | |
1124 } else if (ctx->nof_implementors() != 0) { | |
1125 // if it is an interface, it must be unimplemented | |
1126 // (if it is not an interface, nof_implementors is always zero) | |
1127 klassOop impl = ctx->implementor(0); | |
1128 return (impl != NULL)? impl: ctxk; | |
1129 } else { | |
1130 return NULL; | |
1131 } | |
1132 } | |
1133 | |
1134 // Test the assertion that conck is the only concrete subtype* of ctxk. | |
1135 // The type conck itself is allowed to have have further concrete subtypes. | |
1136 // This allows the compiler to narrow occurrences of ctxk by conck, | |
1137 // when dealing with the types of actual instances. | |
1138 klassOop Dependencies::check_abstract_with_unique_concrete_subtype(klassOop ctxk, | |
1139 klassOop conck, | |
1140 DepChange* changes) { | |
1141 ClassHierarchyWalker wf(conck); | |
1142 return wf.find_witness_subtype(ctxk, changes); | |
1143 } | |
1144 | |
1145 // If a non-concrete class has no concrete subtypes, it is not (yet) | |
1146 // instantiatable. This can allow the compiler to make some paths go | |
1147 // dead, if they are gated by a test of the type. | |
1148 klassOop Dependencies::check_abstract_with_no_concrete_subtype(klassOop ctxk, | |
1149 DepChange* changes) { | |
1150 // Find any concrete subtype, with no participants: | |
1151 ClassHierarchyWalker wf; | |
1152 return wf.find_witness_subtype(ctxk, changes); | |
1153 } | |
1154 | |
1155 | |
1156 // If a concrete class has no concrete subtypes, it can always be | |
1157 // exactly typed. This allows the use of a cheaper type test. | |
1158 klassOop Dependencies::check_concrete_with_no_concrete_subtype(klassOop ctxk, | |
1159 DepChange* changes) { | |
1160 // Find any concrete subtype, with only the ctxk as participant: | |
1161 ClassHierarchyWalker wf(ctxk); | |
1162 return wf.find_witness_subtype(ctxk, changes); | |
1163 } | |
1164 | |
1165 | |
1166 // Find the unique concrete proper subtype of ctxk, or NULL if there | |
1167 // is more than one concrete proper subtype. If there are no concrete | |
1168 // proper subtypes, return ctxk itself, whether it is concrete or not. | |
1169 // The returned subtype is allowed to have have further concrete subtypes. | |
1170 // That is, return CC1 for CX > CC1 > CC2, but NULL for CX > { CC1, CC2 }. | |
1171 klassOop Dependencies::find_unique_concrete_subtype(klassOop ctxk) { | |
1172 ClassHierarchyWalker wf(ctxk); // Ignore ctxk when walking. | |
1173 wf.record_witnesses(1); // Record one other witness when walking. | |
1174 klassOop wit = wf.find_witness_subtype(ctxk); | |
1175 if (wit != NULL) return NULL; // Too many witnesses. | |
1176 klassOop conck = wf.participant(0); | |
1177 if (conck == NULL) { | |
1178 #ifndef PRODUCT | |
1179 // Make sure the dependency mechanism will pass this discovery: | |
1180 if (VerifyDependencies) { | |
1181 // Turn off dependency tracing while actually testing deps. | |
1182 FlagSetting fs(TraceDependencies, false); | |
1183 if (!Dependencies::is_concrete_klass(ctxk)) { | |
1184 guarantee(NULL == | |
1185 (void *)check_abstract_with_no_concrete_subtype(ctxk), | |
1186 "verify dep."); | |
1187 } else { | |
1188 guarantee(NULL == | |
1189 (void *)check_concrete_with_no_concrete_subtype(ctxk), | |
1190 "verify dep."); | |
1191 } | |
1192 } | |
1193 #endif //PRODUCT | |
1194 return ctxk; // Return ctxk as a flag for "no subtypes". | |
1195 } else { | |
1196 #ifndef PRODUCT | |
1197 // Make sure the dependency mechanism will pass this discovery: | |
1198 if (VerifyDependencies) { | |
1199 // Turn off dependency tracing while actually testing deps. | |
1200 FlagSetting fs(TraceDependencies, false); | |
1201 if (!Dependencies::is_concrete_klass(ctxk)) { | |
1202 guarantee(NULL == (void *) | |
1203 check_abstract_with_unique_concrete_subtype(ctxk, conck), | |
1204 "verify dep."); | |
1205 } | |
1206 } | |
1207 #endif //PRODUCT | |
1208 return conck; | |
1209 } | |
1210 } | |
1211 | |
1212 // Test the assertion that the k[12] are the only concrete subtypes of ctxk, | |
1213 // except possibly for further subtypes of k[12] themselves. | |
1214 // The context type must be abstract. The types k1 and k2 are themselves | |
1215 // allowed to have further concrete subtypes. | |
1216 klassOop Dependencies::check_abstract_with_exclusive_concrete_subtypes( | |
1217 klassOop ctxk, | |
1218 klassOop k1, | |
1219 klassOop k2, | |
1220 DepChange* changes) { | |
1221 ClassHierarchyWalker wf; | |
1222 wf.add_participant(k1); | |
1223 wf.add_participant(k2); | |
1224 return wf.find_witness_subtype(ctxk, changes); | |
1225 } | |
1226 | |
1227 // Search ctxk for concrete implementations. If there are klen or fewer, | |
1228 // pack them into the given array and return the number. | |
1229 // Otherwise, return -1, meaning the given array would overflow. | |
1230 // (Note that a return of 0 means there are exactly no concrete subtypes.) | |
1231 // In this search, if ctxk is concrete, it will be reported alone. | |
1232 // For any type CC reported, no proper subtypes of CC will be reported. | |
1233 int Dependencies::find_exclusive_concrete_subtypes(klassOop ctxk, | |
1234 int klen, | |
1235 klassOop karray[]) { | |
1236 ClassHierarchyWalker wf; | |
1237 wf.record_witnesses(klen); | |
1238 klassOop wit = wf.find_witness_subtype(ctxk); | |
1239 if (wit != NULL) return -1; // Too many witnesses. | |
1240 int num = wf.num_participants(); | |
1241 assert(num <= klen, "oob"); | |
1242 // Pack the result array with the good news. | |
1243 for (int i = 0; i < num; i++) | |
1244 karray[i] = wf.participant(i); | |
1245 #ifndef PRODUCT | |
1246 // Make sure the dependency mechanism will pass this discovery: | |
1247 if (VerifyDependencies) { | |
1248 // Turn off dependency tracing while actually testing deps. | |
1249 FlagSetting fs(TraceDependencies, false); | |
1250 switch (Dependencies::is_concrete_klass(ctxk)? -1: num) { | |
1251 case -1: // ctxk was itself concrete | |
1252 guarantee(num == 1 && karray[0] == ctxk, "verify dep."); | |
1253 break; | |
1254 case 0: | |
1255 guarantee(NULL == (void *)check_abstract_with_no_concrete_subtype(ctxk), | |
1256 "verify dep."); | |
1257 break; | |
1258 case 1: | |
1259 guarantee(NULL == (void *) | |
1260 check_abstract_with_unique_concrete_subtype(ctxk, karray[0]), | |
1261 "verify dep."); | |
1262 break; | |
1263 case 2: | |
1264 guarantee(NULL == (void *) | |
1265 check_abstract_with_exclusive_concrete_subtypes(ctxk, | |
1266 karray[0], | |
1267 karray[1]), | |
1268 "verify dep."); | |
1269 break; | |
1270 default: | |
1271 ShouldNotReachHere(); // klen > 2 yet supported | |
1272 } | |
1273 } | |
1274 #endif //PRODUCT | |
1275 return num; | |
1276 } | |
1277 | |
1278 // If a class (or interface) has a unique concrete method uniqm, return NULL. | |
1279 // Otherwise, return a class that contains an interfering method. | |
1280 klassOop Dependencies::check_unique_concrete_method(klassOop ctxk, methodOop uniqm, | |
1281 DepChange* changes) { | |
1282 // Here is a missing optimization: If uniqm->is_final(), | |
1283 // we don't really need to search beneath it for overrides. | |
1284 // This is probably not important, since we don't use dependencies | |
1285 // to track final methods. (They can't be "definalized".) | |
1286 ClassHierarchyWalker wf(uniqm->method_holder(), uniqm); | |
1287 return wf.find_witness_definer(ctxk, changes); | |
1288 } | |
1289 | |
1290 // Find the set of all non-abstract methods under ctxk that match m. | |
1291 // (The method m must be defined or inherited in ctxk.) | |
1292 // Include m itself in the set, unless it is abstract. | |
1293 // If this set has exactly one element, return that element. | |
1294 methodOop Dependencies::find_unique_concrete_method(klassOop ctxk, methodOop m) { | |
1295 ClassHierarchyWalker wf(m); | |
1296 assert(wf.check_method_context(ctxk, m), "proper context"); | |
1297 wf.record_witnesses(1); | |
1298 klassOop wit = wf.find_witness_definer(ctxk); | |
1299 if (wit != NULL) return NULL; // Too many witnesses. | |
1300 methodOop fm = wf.found_method(0); // Will be NULL if num_parts == 0. | |
1301 if (Dependencies::is_concrete_method(m)) { | |
1302 if (fm == NULL) { | |
1303 // It turns out that m was always the only implementation. | |
1304 fm = m; | |
1305 } else if (fm != m) { | |
1306 // Two conflicting implementations after all. | |
1307 // (This can happen if m is inherited into ctxk and fm overrides it.) | |
1308 return NULL; | |
1309 } | |
1310 } | |
1311 #ifndef PRODUCT | |
1312 // Make sure the dependency mechanism will pass this discovery: | |
1313 if (VerifyDependencies && fm != NULL) { | |
1314 guarantee(NULL == (void *)check_unique_concrete_method(ctxk, fm), | |
1315 "verify dep."); | |
1316 } | |
1317 #endif //PRODUCT | |
1318 return fm; | |
1319 } | |
1320 | |
1321 klassOop Dependencies::check_exclusive_concrete_methods(klassOop ctxk, | |
1322 methodOop m1, | |
1323 methodOop m2, | |
1324 DepChange* changes) { | |
1325 ClassHierarchyWalker wf(m1); | |
1326 wf.add_participant(m1->method_holder()); | |
1327 wf.add_participant(m2->method_holder()); | |
1328 return wf.find_witness_definer(ctxk, changes); | |
1329 } | |
1330 | |
1331 // Find the set of all non-abstract methods under ctxk that match m[0]. | |
1332 // (The method m[0] must be defined or inherited in ctxk.) | |
1333 // Include m itself in the set, unless it is abstract. | |
1334 // Fill the given array m[0..(mlen-1)] with this set, and return the length. | |
1335 // (The length may be zero if no concrete methods are found anywhere.) | |
1336 // If there are too many concrete methods to fit in marray, return -1. | |
1337 int Dependencies::find_exclusive_concrete_methods(klassOop ctxk, | |
1338 int mlen, | |
1339 methodOop marray[]) { | |
1340 methodOop m0 = marray[0]; | |
1341 ClassHierarchyWalker wf(m0); | |
1342 assert(wf.check_method_context(ctxk, m0), "proper context"); | |
1343 wf.record_witnesses(mlen); | |
1344 bool participants_hide_witnesses = true; | |
1345 klassOop wit = wf.find_witness_definer(ctxk); | |
1346 if (wit != NULL) return -1; // Too many witnesses. | |
1347 int num = wf.num_participants(); | |
1348 assert(num <= mlen, "oob"); | |
1349 // Keep track of whether m is also part of the result set. | |
1350 int mfill = 0; | |
1351 assert(marray[mfill] == m0, "sanity"); | |
1352 if (Dependencies::is_concrete_method(m0)) | |
1353 mfill++; // keep m0 as marray[0], the first result | |
1354 for (int i = 0; i < num; i++) { | |
1355 methodOop fm = wf.found_method(i); | |
1356 if (fm == m0) continue; // Already put this guy in the list. | |
1357 if (mfill == mlen) { | |
1358 return -1; // Oops. Too many methods after all! | |
1359 } | |
1360 marray[mfill++] = fm; | |
1361 } | |
1362 #ifndef PRODUCT | |
1363 // Make sure the dependency mechanism will pass this discovery: | |
1364 if (VerifyDependencies) { | |
1365 // Turn off dependency tracing while actually testing deps. | |
1366 FlagSetting fs(TraceDependencies, false); | |
1367 switch (mfill) { | |
1368 case 1: | |
1369 guarantee(NULL == (void *)check_unique_concrete_method(ctxk, marray[0]), | |
1370 "verify dep."); | |
1371 break; | |
1372 case 2: | |
1373 guarantee(NULL == (void *) | |
1374 check_exclusive_concrete_methods(ctxk, marray[0], marray[1]), | |
1375 "verify dep."); | |
1376 break; | |
1377 default: | |
1378 ShouldNotReachHere(); // mlen > 2 yet supported | |
1379 } | |
1380 } | |
1381 #endif //PRODUCT | |
1382 return mfill; | |
1383 } | |
1384 | |
1385 | |
1386 klassOop Dependencies::check_has_no_finalizable_subclasses(klassOop ctxk, DepChange* changes) { | |
1387 Klass* search_at = ctxk->klass_part(); | |
1388 if (changes != NULL) | |
1389 search_at = changes->new_type()->klass_part(); // just look at the new bit | |
1390 Klass* result = find_finalizable_subclass(search_at); | |
1391 if (result == NULL) { | |
1392 return NULL; | |
1393 } | |
1394 return result->as_klassOop(); | |
1395 } | |
1396 | |
1397 | |
1398 klassOop Dependencies::DepStream::check_dependency_impl(DepChange* changes) { | |
1399 assert_locked_or_safepoint(Compile_lock); | |
1400 | |
1401 klassOop witness = NULL; | |
1402 switch (type()) { | |
1403 case evol_method: | |
1404 witness = check_evol_method(method_argument(0)); | |
1405 break; | |
1406 case leaf_type: | |
1407 witness = check_leaf_type(context_type()); | |
1408 break; | |
1409 case abstract_with_unique_concrete_subtype: | |
1410 witness = check_abstract_with_unique_concrete_subtype(context_type(), | |
1411 type_argument(1), | |
1412 changes); | |
1413 break; | |
1414 case abstract_with_no_concrete_subtype: | |
1415 witness = check_abstract_with_no_concrete_subtype(context_type(), | |
1416 changes); | |
1417 break; | |
1418 case concrete_with_no_concrete_subtype: | |
1419 witness = check_concrete_with_no_concrete_subtype(context_type(), | |
1420 changes); | |
1421 break; | |
1422 case unique_concrete_method: | |
1423 witness = check_unique_concrete_method(context_type(), | |
1424 method_argument(1), | |
1425 changes); | |
1426 break; | |
1427 case abstract_with_exclusive_concrete_subtypes_2: | |
1428 witness = check_abstract_with_exclusive_concrete_subtypes(context_type(), | |
1429 type_argument(1), | |
1430 type_argument(2), | |
1431 changes); | |
1432 break; | |
1433 case exclusive_concrete_methods_2: | |
1434 witness = check_exclusive_concrete_methods(context_type(), | |
1435 method_argument(1), | |
1436 method_argument(2), | |
1437 changes); | |
1438 break; | |
1439 case no_finalizable_subclasses: | |
1440 witness = check_has_no_finalizable_subclasses(context_type(), | |
1441 changes); | |
1442 break; | |
1443 default: | |
1444 witness = NULL; | |
1445 ShouldNotReachHere(); | |
1446 break; | |
1447 } | |
1448 if (witness != NULL) { | |
1449 if (TraceDependencies) { | |
1450 print_dependency(witness, /*verbose=*/ true); | |
1451 } | |
1452 // The following is a no-op unless logging is enabled: | |
1453 log_dependency(witness); | |
1454 } | |
1455 return witness; | |
1456 } | |
1457 | |
1458 | |
1459 klassOop Dependencies::DepStream::spot_check_dependency_at(DepChange& changes) { | |
1460 if (!changes.involves_context(context_type())) | |
1461 // irrelevant dependency; skip it | |
1462 return NULL; | |
1463 | |
1464 return check_dependency_impl(&changes); | |
1465 } | |
1466 | |
1467 | |
1468 void DepChange::initialize() { | |
1469 // entire transaction must be under this lock: | |
1470 assert_lock_strong(Compile_lock); | |
1471 | |
1472 // Mark all dependee and all its superclasses | |
1473 // Mark transitive interfaces | |
1474 for (ContextStream str(*this); str.next(); ) { | |
1475 klassOop d = str.klass(); | |
1476 assert(!instanceKlass::cast(d)->is_marked_dependent(), "checking"); | |
975 | 1477 instanceKlass::cast(d)->set_is_marked_dependent(true); |
0 | 1478 } |
1479 } | |
1480 | |
1481 DepChange::~DepChange() { | |
1482 // Unmark all dependee and all its superclasses | |
1483 // Unmark transitive interfaces | |
1484 for (ContextStream str(*this); str.next(); ) { | |
1485 klassOop d = str.klass(); | |
975 | 1486 instanceKlass::cast(d)->set_is_marked_dependent(false); |
0 | 1487 } |
1488 } | |
1489 | |
1490 bool DepChange::involves_context(klassOop k) { | |
1491 if (k == NULL || !Klass::cast(k)->oop_is_instance()) { | |
1492 return false; | |
1493 } | |
1494 instanceKlass* ik = instanceKlass::cast(k); | |
1495 bool is_contained = ik->is_marked_dependent(); | |
1496 assert(is_contained == Klass::cast(new_type())->is_subtype_of(k), | |
1497 "correct marking of potential context types"); | |
1498 return is_contained; | |
1499 } | |
1500 | |
1501 bool DepChange::ContextStream::next() { | |
1502 switch (_change_type) { | |
1503 case Start_Klass: // initial state; _klass is the new type | |
1504 _ti_base = instanceKlass::cast(_klass)->transitive_interfaces(); | |
1505 _ti_index = 0; | |
1506 _change_type = Change_new_type; | |
1507 return true; | |
1508 case Change_new_type: | |
1509 // fall through: | |
1510 _change_type = Change_new_sub; | |
1511 case Change_new_sub: | |
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1512 // 6598190: brackets workaround Sun Studio C++ compiler bug 6629277 |
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1513 { |
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1514 _klass = instanceKlass::cast(_klass)->super(); |
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1515 if (_klass != NULL) { |
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1516 return true; |
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1517 } |
0 | 1518 } |
1519 // else set up _ti_limit and fall through: | |
1520 _ti_limit = (_ti_base == NULL) ? 0 : _ti_base->length(); | |
1521 _change_type = Change_new_impl; | |
1522 case Change_new_impl: | |
1523 if (_ti_index < _ti_limit) { | |
1524 _klass = klassOop( _ti_base->obj_at(_ti_index++) ); | |
1525 return true; | |
1526 } | |
1527 // fall through: | |
1528 _change_type = NO_CHANGE; // iterator is exhausted | |
1529 case NO_CHANGE: | |
1530 break; | |
1531 default: | |
1532 ShouldNotReachHere(); | |
1533 } | |
1534 return false; | |
1535 } | |
1536 | |
1537 void DepChange::print() { | |
1538 int nsup = 0, nint = 0; | |
1539 for (ContextStream str(*this); str.next(); ) { | |
1540 klassOop k = str.klass(); | |
1123
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1541 switch (str.change_type()) { |
0 | 1542 case Change_new_type: |
1543 tty->print_cr(" dependee = %s", instanceKlass::cast(k)->external_name()); | |
1544 break; | |
1545 case Change_new_sub: | |
1123
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1546 if (!WizardMode) { |
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1547 ++nsup; |
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1548 } else { |
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1549 tty->print_cr(" context super = %s", instanceKlass::cast(k)->external_name()); |
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1550 } |
0 | 1551 break; |
1552 case Change_new_impl: | |
1123
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1553 if (!WizardMode) { |
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1554 ++nint; |
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1555 } else { |
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1556 tty->print_cr(" context interface = %s", instanceKlass::cast(k)->external_name()); |
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1557 } |
0 | 1558 break; |
1559 } | |
1560 } | |
1561 if (nsup + nint != 0) { | |
1562 tty->print_cr(" context supers = %d, interfaces = %d", nsup, nint); | |
1563 } | |
1564 } | |
1565 | |
1566 #ifndef PRODUCT | |
1567 void Dependencies::print_statistics() { | |
1568 if (deps_find_witness_print != 0) { | |
1569 // Call one final time, to flush out the data. | |
1570 deps_find_witness_print = -1; | |
1571 count_find_witness_calls(); | |
1572 } | |
1573 } | |
1574 #endif |