Mercurial > hg > truffle
annotate src/share/vm/code/dependencies.cpp @ 1206:87684f1a88b5
6614597: Performance variability in jvm2008 xml.validation
Summary: Fix incorrect marking of methods as not compilable.
Reviewed-by: never
| author | kvn |
|---|---|
| date | Mon, 01 Feb 2010 16:49:49 -0800 |
| parents | 167c2986d91b |
| children | c18cbe5936b8 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 2005-2008 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_dependencies.cpp.incl" | |
| 27 | |
| 28 | |
| 29 #ifdef ASSERT | |
| 30 static bool must_be_in_vm() { | |
| 31 Thread* thread = Thread::current(); | |
| 32 if (thread->is_Java_thread()) | |
| 33 return ((JavaThread*)thread)->thread_state() == _thread_in_vm; | |
| 34 else | |
| 35 return true; //something like this: thread->is_VM_thread(); | |
| 36 } | |
| 37 #endif //ASSERT | |
| 38 | |
| 39 void Dependencies::initialize(ciEnv* env) { | |
| 40 Arena* arena = env->arena(); | |
| 41 _oop_recorder = env->oop_recorder(); | |
| 42 _log = env->log(); | |
| 43 _dep_seen = new(arena) GrowableArray<int>(arena, 500, 0, 0); | |
| 44 DEBUG_ONLY(_deps[end_marker] = NULL); | |
| 45 for (int i = (int)FIRST_TYPE; i < (int)TYPE_LIMIT; i++) { | |
| 46 _deps[i] = new(arena) GrowableArray<ciObject*>(arena, 10, 0, 0); | |
| 47 } | |
| 48 _content_bytes = NULL; | |
| 49 _size_in_bytes = (size_t)-1; | |
| 50 | |
| 51 assert(TYPE_LIMIT <= (1<<LG2_TYPE_LIMIT), "sanity"); | |
| 52 } | |
| 53 | |
| 54 void Dependencies::assert_evol_method(ciMethod* m) { | |
| 55 assert_common_1(evol_method, m); | |
| 56 } | |
| 57 | |
| 58 void Dependencies::assert_leaf_type(ciKlass* ctxk) { | |
| 59 if (ctxk->is_array_klass()) { | |
| 60 // As a special case, support this assertion on an array type, | |
| 61 // which reduces to an assertion on its element type. | |
| 62 // Note that this cannot be done with assertions that | |
| 63 // relate to concreteness or abstractness. | |
| 64 ciType* elemt = ctxk->as_array_klass()->base_element_type(); | |
| 65 if (!elemt->is_instance_klass()) return; // Ex: int[][] | |
| 66 ctxk = elemt->as_instance_klass(); | |
| 67 //if (ctxk->is_final()) return; // Ex: String[][] | |
| 68 } | |
| 69 check_ctxk(ctxk); | |
| 70 assert_common_1(leaf_type, ctxk); | |
| 71 } | |
| 72 | |
| 73 void Dependencies::assert_abstract_with_unique_concrete_subtype(ciKlass* ctxk, ciKlass* conck) { | |
| 74 check_ctxk_abstract(ctxk); | |
| 75 assert_common_2(abstract_with_unique_concrete_subtype, ctxk, conck); | |
| 76 } | |
| 77 | |
| 78 void Dependencies::assert_abstract_with_no_concrete_subtype(ciKlass* ctxk) { | |
| 79 check_ctxk_abstract(ctxk); | |
| 80 assert_common_1(abstract_with_no_concrete_subtype, ctxk); | |
| 81 } | |
| 82 | |
| 83 void Dependencies::assert_concrete_with_no_concrete_subtype(ciKlass* ctxk) { | |
| 84 check_ctxk_concrete(ctxk); | |
| 85 assert_common_1(concrete_with_no_concrete_subtype, ctxk); | |
| 86 } | |
| 87 | |
| 88 void Dependencies::assert_unique_concrete_method(ciKlass* ctxk, ciMethod* uniqm) { | |
| 89 check_ctxk(ctxk); | |
| 90 assert_common_2(unique_concrete_method, ctxk, uniqm); | |
| 91 } | |
| 92 | |
| 93 void Dependencies::assert_abstract_with_exclusive_concrete_subtypes(ciKlass* ctxk, ciKlass* k1, ciKlass* k2) { | |
| 94 check_ctxk(ctxk); | |
| 95 assert_common_3(abstract_with_exclusive_concrete_subtypes_2, ctxk, k1, k2); | |
| 96 } | |
| 97 | |
| 98 void Dependencies::assert_exclusive_concrete_methods(ciKlass* ctxk, ciMethod* m1, ciMethod* m2) { | |
| 99 check_ctxk(ctxk); | |
| 100 assert_common_3(exclusive_concrete_methods_2, ctxk, m1, m2); | |
| 101 } | |
| 102 | |
| 103 void Dependencies::assert_has_no_finalizable_subclasses(ciKlass* ctxk) { | |
| 104 check_ctxk(ctxk); | |
| 105 assert_common_1(no_finalizable_subclasses, ctxk); | |
| 106 } | |
| 107 | |
| 108 // Helper function. If we are adding a new dep. under ctxk2, | |
| 109 // try to find an old dep. under a broader* ctxk1. If there is | |
| 110 // | |
| 111 bool Dependencies::maybe_merge_ctxk(GrowableArray<ciObject*>* deps, | |
| 112 int ctxk_i, ciKlass* ctxk2) { | |
| 113 ciKlass* ctxk1 = deps->at(ctxk_i)->as_klass(); | |
| 114 if (ctxk2->is_subtype_of(ctxk1)) { | |
| 115 return true; // success, and no need to change | |
| 116 } else if (ctxk1->is_subtype_of(ctxk2)) { | |
| 117 // new context class fully subsumes previous one | |
| 118 deps->at_put(ctxk_i, ctxk2); | |
| 119 return true; | |
| 120 } else { | |
| 121 return false; | |
| 122 } | |
| 123 } | |
| 124 | |
| 125 void Dependencies::assert_common_1(Dependencies::DepType dept, ciObject* x) { | |
| 126 assert(dep_args(dept) == 1, "sanity"); | |
| 127 log_dependency(dept, x); | |
| 128 GrowableArray<ciObject*>* deps = _deps[dept]; | |
| 129 | |
| 130 // see if the same (or a similar) dep is already recorded | |
| 131 if (note_dep_seen(dept, x)) { | |
| 132 assert(deps->find(x) >= 0, "sanity"); | |
| 133 } else { | |
| 134 deps->append(x); | |
| 135 } | |
| 136 } | |
| 137 | |
| 138 void Dependencies::assert_common_2(Dependencies::DepType dept, | |
| 139 ciKlass* ctxk, ciObject* x) { | |
| 140 assert(dep_context_arg(dept) == 0, "sanity"); | |
| 141 assert(dep_args(dept) == 2, "sanity"); | |
| 142 log_dependency(dept, ctxk, x); | |
| 143 GrowableArray<ciObject*>* deps = _deps[dept]; | |
| 144 | |
| 145 // see if the same (or a similar) dep is already recorded | |
| 146 if (note_dep_seen(dept, x)) { | |
| 147 // look in this bucket for redundant assertions | |
| 148 const int stride = 2; | |
| 149 for (int i = deps->length(); (i -= stride) >= 0; ) { | |
| 150 ciObject* x1 = deps->at(i+1); | |
| 151 if (x == x1) { // same subject; check the context | |
| 152 if (maybe_merge_ctxk(deps, i+0, ctxk)) { | |
| 153 return; | |
| 154 } | |
| 155 } | |
| 156 } | |
| 157 } | |
| 158 | |
| 159 // append the assertion in the correct bucket: | |
| 160 deps->append(ctxk); | |
| 161 deps->append(x); | |
| 162 } | |
| 163 | |
| 164 void Dependencies::assert_common_3(Dependencies::DepType dept, | |
| 165 ciKlass* ctxk, ciObject* x, ciObject* x2) { | |
| 166 assert(dep_context_arg(dept) == 0, "sanity"); | |
| 167 assert(dep_args(dept) == 3, "sanity"); | |
| 168 log_dependency(dept, ctxk, x, x2); | |
| 169 GrowableArray<ciObject*>* deps = _deps[dept]; | |
| 170 | |
| 171 // try to normalize an unordered pair: | |
| 172 bool swap = false; | |
| 173 switch (dept) { | |
| 174 case abstract_with_exclusive_concrete_subtypes_2: | |
| 175 swap = (x->ident() > x2->ident() && x != ctxk); | |
| 176 break; | |
| 177 case exclusive_concrete_methods_2: | |
| 178 swap = (x->ident() > x2->ident() && x->as_method()->holder() != ctxk); | |
| 179 break; | |
| 180 } | |
| 181 if (swap) { ciObject* t = x; x = x2; x2 = t; } | |
| 182 | |
| 183 // see if the same (or a similar) dep is already recorded | |
| 184 if (note_dep_seen(dept, x) && note_dep_seen(dept, x2)) { | |
| 185 // look in this bucket for redundant assertions | |
| 186 const int stride = 3; | |
| 187 for (int i = deps->length(); (i -= stride) >= 0; ) { | |
| 188 ciObject* y = deps->at(i+1); | |
| 189 ciObject* y2 = deps->at(i+2); | |
| 190 if (x == y && x2 == y2) { // same subjects; check the context | |
| 191 if (maybe_merge_ctxk(deps, i+0, ctxk)) { | |
| 192 return; | |
| 193 } | |
| 194 } | |
| 195 } | |
| 196 } | |
| 197 // append the assertion in the correct bucket: | |
| 198 deps->append(ctxk); | |
| 199 deps->append(x); | |
| 200 deps->append(x2); | |
| 201 } | |
| 202 | |
| 203 /// Support for encoding dependencies into an nmethod: | |
| 204 | |
| 205 void Dependencies::copy_to(nmethod* nm) { | |
| 206 address beg = nm->dependencies_begin(); | |
| 207 address end = nm->dependencies_end(); | |
| 208 guarantee(end - beg >= (ptrdiff_t) size_in_bytes(), "bad sizing"); | |
| 209 Copy::disjoint_words((HeapWord*) content_bytes(), | |
| 210 (HeapWord*) beg, | |
| 211 size_in_bytes() / sizeof(HeapWord)); | |
| 212 assert(size_in_bytes() % sizeof(HeapWord) == 0, "copy by words"); | |
| 213 } | |
| 214 | |
| 215 static int sort_dep(ciObject** p1, ciObject** p2, int narg) { | |
| 216 for (int i = 0; i < narg; i++) { | |
| 217 int diff = p1[i]->ident() - p2[i]->ident(); | |
| 218 if (diff != 0) return diff; | |
| 219 } | |
| 220 return 0; | |
| 221 } | |
| 222 static int sort_dep_arg_1(ciObject** p1, ciObject** p2) | |
| 223 { return sort_dep(p1, p2, 1); } | |
| 224 static int sort_dep_arg_2(ciObject** p1, ciObject** p2) | |
| 225 { return sort_dep(p1, p2, 2); } | |
| 226 static int sort_dep_arg_3(ciObject** p1, ciObject** p2) | |
| 227 { return sort_dep(p1, p2, 3); } | |
| 228 | |
| 229 void Dependencies::sort_all_deps() { | |
| 230 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { | |
| 231 DepType dept = (DepType)deptv; | |
| 232 GrowableArray<ciObject*>* deps = _deps[dept]; | |
| 233 if (deps->length() <= 1) continue; | |
| 234 switch (dep_args(dept)) { | |
| 235 case 1: deps->sort(sort_dep_arg_1, 1); break; | |
| 236 case 2: deps->sort(sort_dep_arg_2, 2); break; | |
| 237 case 3: deps->sort(sort_dep_arg_3, 3); break; | |
| 238 default: ShouldNotReachHere(); | |
| 239 } | |
| 240 } | |
| 241 } | |
| 242 | |
| 243 size_t Dependencies::estimate_size_in_bytes() { | |
| 244 size_t est_size = 100; | |
| 245 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { | |
| 246 DepType dept = (DepType)deptv; | |
| 247 GrowableArray<ciObject*>* deps = _deps[dept]; | |
| 248 est_size += deps->length()*2; // tags and argument(s) | |
| 249 } | |
| 250 return est_size; | |
| 251 } | |
| 252 | |
| 253 ciKlass* Dependencies::ctxk_encoded_as_null(DepType dept, ciObject* x) { | |
| 254 switch (dept) { | |
| 255 case abstract_with_exclusive_concrete_subtypes_2: | |
| 256 return x->as_klass(); | |
| 257 case unique_concrete_method: | |
| 258 case exclusive_concrete_methods_2: | |
| 259 return x->as_method()->holder(); | |
| 260 } | |
| 261 return NULL; // let NULL be NULL | |
| 262 } | |
| 263 | |
| 264 klassOop Dependencies::ctxk_encoded_as_null(DepType dept, oop x) { | |
| 265 assert(must_be_in_vm(), "raw oops here"); | |
| 266 switch (dept) { | |
| 267 case abstract_with_exclusive_concrete_subtypes_2: | |
| 268 assert(x->is_klass(), "sanity"); | |
| 269 return (klassOop) x; | |
| 270 case unique_concrete_method: | |
| 271 case exclusive_concrete_methods_2: | |
| 272 assert(x->is_method(), "sanity"); | |
| 273 return ((methodOop)x)->method_holder(); | |
| 274 } | |
| 275 return NULL; // let NULL be NULL | |
| 276 } | |
| 277 | |
| 278 void Dependencies::encode_content_bytes() { | |
| 279 sort_all_deps(); | |
| 280 | |
| 281 // cast is safe, no deps can overflow INT_MAX | |
| 282 CompressedWriteStream bytes((int)estimate_size_in_bytes()); | |
| 283 | |
| 284 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { | |
| 285 DepType dept = (DepType)deptv; | |
| 286 GrowableArray<ciObject*>* deps = _deps[dept]; | |
| 287 if (deps->length() == 0) continue; | |
| 288 int stride = dep_args(dept); | |
| 289 int ctxkj = dep_context_arg(dept); // -1 if no context arg | |
| 290 assert(stride > 0, "sanity"); | |
| 291 for (int i = 0; i < deps->length(); i += stride) { | |
| 292 jbyte code_byte = (jbyte)dept; | |
| 293 int skipj = -1; | |
| 294 if (ctxkj >= 0 && ctxkj+1 < stride) { | |
| 295 ciKlass* ctxk = deps->at(i+ctxkj+0)->as_klass(); | |
| 296 ciObject* x = deps->at(i+ctxkj+1); // following argument | |
| 297 if (ctxk == ctxk_encoded_as_null(dept, x)) { | |
| 298 skipj = ctxkj; // we win: maybe one less oop to keep track of | |
| 299 code_byte |= default_context_type_bit; | |
| 300 } | |
| 301 } | |
| 302 bytes.write_byte(code_byte); | |
| 303 for (int j = 0; j < stride; j++) { | |
| 304 if (j == skipj) continue; | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
196
diff
changeset
|
305 bytes.write_int(_oop_recorder->find_index(deps->at(i+j)->constant_encoding())); |
| 0 | 306 } |
| 307 } | |
| 308 } | |
| 309 | |
| 310 // write a sentinel byte to mark the end | |
| 311 bytes.write_byte(end_marker); | |
| 312 | |
| 313 // round it out to a word boundary | |
| 314 while (bytes.position() % sizeof(HeapWord) != 0) { | |
| 315 bytes.write_byte(end_marker); | |
| 316 } | |
| 317 | |
| 318 // check whether the dept byte encoding really works | |
| 319 assert((jbyte)default_context_type_bit != 0, "byte overflow"); | |
| 320 | |
| 321 _content_bytes = bytes.buffer(); | |
| 322 _size_in_bytes = bytes.position(); | |
| 323 } | |
| 324 | |
| 325 | |
| 326 const char* Dependencies::_dep_name[TYPE_LIMIT] = { | |
| 327 "end_marker", | |
| 328 "evol_method", | |
| 329 "leaf_type", | |
| 330 "abstract_with_unique_concrete_subtype", | |
| 331 "abstract_with_no_concrete_subtype", | |
| 332 "concrete_with_no_concrete_subtype", | |
| 333 "unique_concrete_method", | |
| 334 "abstract_with_exclusive_concrete_subtypes_2", | |
| 335 "exclusive_concrete_methods_2", | |
| 336 "no_finalizable_subclasses" | |
| 337 }; | |
| 338 | |
| 339 int Dependencies::_dep_args[TYPE_LIMIT] = { | |
| 340 -1,// end_marker | |
| 341 1, // evol_method m | |
| 342 1, // leaf_type ctxk | |
| 343 2, // abstract_with_unique_concrete_subtype ctxk, k | |
| 344 1, // abstract_with_no_concrete_subtype ctxk | |
| 345 1, // concrete_with_no_concrete_subtype ctxk | |
| 346 2, // unique_concrete_method ctxk, m | |
| 347 3, // unique_concrete_subtypes_2 ctxk, k1, k2 | |
| 348 3, // unique_concrete_methods_2 ctxk, m1, m2 | |
| 349 1 // no_finalizable_subclasses ctxk | |
| 350 }; | |
| 351 | |
| 352 const char* Dependencies::dep_name(Dependencies::DepType dept) { | |
| 353 if (!dept_in_mask(dept, all_types)) return "?bad-dep?"; | |
| 354 return _dep_name[dept]; | |
| 355 } | |
| 356 | |
| 357 int Dependencies::dep_args(Dependencies::DepType dept) { | |
| 358 if (!dept_in_mask(dept, all_types)) return -1; | |
| 359 return _dep_args[dept]; | |
| 360 } | |
| 361 | |
| 362 // for the sake of the compiler log, print out current dependencies: | |
| 363 void Dependencies::log_all_dependencies() { | |
| 364 if (log() == NULL) return; | |
| 365 ciObject* args[max_arg_count]; | |
| 366 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { | |
| 367 DepType dept = (DepType)deptv; | |
| 368 GrowableArray<ciObject*>* deps = _deps[dept]; | |
| 369 if (deps->length() == 0) continue; | |
| 370 int stride = dep_args(dept); | |
| 371 for (int i = 0; i < deps->length(); i += stride) { | |
| 372 for (int j = 0; j < stride; j++) { | |
| 373 // flush out the identities before printing | |
| 374 args[j] = deps->at(i+j); | |
| 375 } | |
| 376 write_dependency_to(log(), dept, stride, args); | |
| 377 } | |
| 378 } | |
| 379 } | |
| 380 | |
| 381 void Dependencies::write_dependency_to(CompileLog* log, | |
| 382 DepType dept, | |
| 383 int nargs, oop args[], | |
| 384 klassOop witness) { | |
| 385 if (log == NULL) { | |
| 386 return; | |
| 387 } | |
| 388 ciEnv* env = ciEnv::current(); | |
| 389 ciObject* ciargs[max_arg_count]; | |
| 390 assert(nargs <= max_arg_count, "oob"); | |
| 391 for (int j = 0; j < nargs; j++) { | |
| 392 ciargs[j] = env->get_object(args[j]); | |
| 393 } | |
| 394 Dependencies::write_dependency_to(log, dept, nargs, ciargs, witness); | |
| 395 } | |
| 396 | |
| 397 void Dependencies::write_dependency_to(CompileLog* log, | |
| 398 DepType dept, | |
| 399 int nargs, ciObject* args[], | |
| 400 klassOop witness) { | |
| 401 if (log == NULL) return; | |
| 402 assert(nargs <= max_arg_count, "oob"); | |
| 403 int argids[max_arg_count]; | |
| 404 int ctxkj = dep_context_arg(dept); // -1 if no context arg | |
| 405 int j; | |
| 406 for (j = 0; j < nargs; j++) { | |
| 407 argids[j] = log->identify(args[j]); | |
| 408 } | |
| 409 if (witness != NULL) { | |
| 410 log->begin_elem("dependency_failed"); | |
| 411 } else { | |
| 412 log->begin_elem("dependency"); | |
| 413 } | |
| 414 log->print(" type='%s'", dep_name(dept)); | |
| 415 if (ctxkj >= 0) { | |
| 416 log->print(" ctxk='%d'", argids[ctxkj]); | |
| 417 } | |
| 418 // write remaining arguments, if any. | |
| 419 for (j = 0; j < nargs; j++) { | |
| 420 if (j == ctxkj) continue; // already logged | |
| 421 if (j == 1) { | |
| 422 log->print( " x='%d'", argids[j]); | |
| 423 } else { | |
| 424 log->print(" x%d='%d'", j, argids[j]); | |
| 425 } | |
| 426 } | |
| 427 if (witness != NULL) { | |
| 428 log->object("witness", witness); | |
| 429 log->stamp(); | |
| 430 } | |
| 431 log->end_elem(); | |
| 432 } | |
| 433 | |
| 434 void Dependencies::write_dependency_to(xmlStream* xtty, | |
| 435 DepType dept, | |
| 436 int nargs, oop args[], | |
| 437 klassOop witness) { | |
| 438 if (xtty == NULL) return; | |
| 439 ttyLocker ttyl; | |
| 440 int ctxkj = dep_context_arg(dept); // -1 if no context arg | |
| 441 if (witness != NULL) { | |
| 442 xtty->begin_elem("dependency_failed"); | |
| 443 } else { | |
| 444 xtty->begin_elem("dependency"); | |
| 445 } | |
| 446 xtty->print(" type='%s'", dep_name(dept)); | |
| 447 if (ctxkj >= 0) { | |
| 448 xtty->object("ctxk", args[ctxkj]); | |
| 449 } | |
| 450 // write remaining arguments, if any. | |
| 451 for (int j = 0; j < nargs; j++) { | |
| 452 if (j == ctxkj) continue; // already logged | |
| 453 if (j == 1) { | |
| 454 xtty->object("x", args[j]); | |
| 455 } else { | |
| 456 char xn[10]; sprintf(xn, "x%d", j); | |
| 457 xtty->object(xn, args[j]); | |
| 458 } | |
| 459 } | |
| 460 if (witness != NULL) { | |
| 461 xtty->object("witness", witness); | |
| 462 xtty->stamp(); | |
| 463 } | |
| 464 xtty->end_elem(); | |
| 465 } | |
| 466 | |
| 467 void Dependencies::print_dependency(DepType dept, int nargs, oop args[], | |
| 468 klassOop witness) { | |
| 469 ResourceMark rm; | |
| 470 ttyLocker ttyl; // keep the following output all in one block | |
| 471 tty->print_cr("%s of type %s", | |
| 472 (witness == NULL)? "Dependency": "Failed dependency", | |
| 473 dep_name(dept)); | |
| 474 // print arguments | |
| 475 int ctxkj = dep_context_arg(dept); // -1 if no context arg | |
| 476 for (int j = 0; j < nargs; j++) { | |
| 477 oop arg = args[j]; | |
| 478 bool put_star = false; | |
| 479 if (arg == NULL) continue; | |
| 480 const char* what; | |
| 481 if (j == ctxkj) { | |
| 482 what = "context"; | |
| 483 put_star = !Dependencies::is_concrete_klass((klassOop)arg); | |
| 484 } else if (arg->is_method()) { | |
| 485 what = "method "; | |
| 486 put_star = !Dependencies::is_concrete_method((methodOop)arg); | |
| 487 } else if (arg->is_klass()) { | |
| 488 what = "class "; | |
| 489 } else { | |
| 490 what = "object "; | |
| 491 } | |
| 492 tty->print(" %s = %s", what, (put_star? "*": "")); | |
| 493 if (arg->is_klass()) | |
| 494 tty->print("%s", Klass::cast((klassOop)arg)->external_name()); | |
| 495 else | |
| 496 arg->print_value(); | |
| 497 tty->cr(); | |
| 498 } | |
| 499 if (witness != NULL) { | |
| 500 bool put_star = !Dependencies::is_concrete_klass(witness); | |
| 501 tty->print_cr(" witness = %s%s", | |
| 502 (put_star? "*": ""), | |
| 503 Klass::cast(witness)->external_name()); | |
| 504 } | |
| 505 } | |
| 506 | |
| 507 void Dependencies::DepStream::log_dependency(klassOop witness) { | |
| 508 if (_deps == NULL && xtty == NULL) return; // fast cutout for runtime | |
| 509 int nargs = argument_count(); | |
| 510 oop args[max_arg_count]; | |
| 511 for (int j = 0; j < nargs; j++) { | |
| 512 args[j] = argument(j); | |
| 513 } | |
| 514 if (_deps != NULL && _deps->log() != NULL) { | |
| 515 Dependencies::write_dependency_to(_deps->log(), | |
| 516 type(), nargs, args, witness); | |
| 517 } else { | |
| 518 Dependencies::write_dependency_to(xtty, | |
| 519 type(), nargs, args, witness); | |
| 520 } | |
| 521 } | |
| 522 | |
| 523 void Dependencies::DepStream::print_dependency(klassOop witness, bool verbose) { | |
| 524 int nargs = argument_count(); | |
| 525 oop args[max_arg_count]; | |
| 526 for (int j = 0; j < nargs; j++) { | |
| 527 args[j] = argument(j); | |
| 528 } | |
| 529 Dependencies::print_dependency(type(), nargs, args, witness); | |
| 530 if (verbose) { | |
| 531 if (_code != NULL) { | |
| 532 tty->print(" code: "); | |
| 533 _code->print_value_on(tty); | |
| 534 tty->cr(); | |
| 535 } | |
| 536 } | |
| 537 } | |
| 538 | |
| 539 | |
| 540 /// Dependency stream support (decodes dependencies from an nmethod): | |
| 541 | |
| 542 #ifdef ASSERT | |
| 543 void Dependencies::DepStream::initial_asserts(size_t byte_limit) { | |
| 544 assert(must_be_in_vm(), "raw oops here"); | |
| 545 _byte_limit = byte_limit; | |
| 546 _type = (DepType)(end_marker-1); // defeat "already at end" assert | |
| 547 assert((_code!=NULL) + (_deps!=NULL) == 1, "one or t'other"); | |
| 548 } | |
| 549 #endif //ASSERT | |
| 550 | |
| 551 bool Dependencies::DepStream::next() { | |
| 552 assert(_type != end_marker, "already at end"); | |
| 553 if (_bytes.position() == 0 && _code != NULL | |
| 554 && _code->dependencies_size() == 0) { | |
| 555 // Method has no dependencies at all. | |
| 556 return false; | |
| 557 } | |
| 558 int code_byte = (_bytes.read_byte() & 0xFF); | |
| 559 if (code_byte == end_marker) { | |
| 560 DEBUG_ONLY(_type = end_marker); | |
| 561 return false; | |
| 562 } else { | |
| 563 int ctxk_bit = (code_byte & Dependencies::default_context_type_bit); | |
| 564 code_byte -= ctxk_bit; | |
| 565 DepType dept = (DepType)code_byte; | |
| 566 _type = dept; | |
| 567 guarantee((dept - FIRST_TYPE) < (TYPE_LIMIT - FIRST_TYPE), | |
| 568 "bad dependency type tag"); | |
| 569 int stride = _dep_args[dept]; | |
| 570 assert(stride == dep_args(dept), "sanity"); | |
| 571 int skipj = -1; | |
| 572 if (ctxk_bit != 0) { | |
| 573 skipj = 0; // currently the only context argument is at zero | |
| 574 assert(skipj == dep_context_arg(dept), "zero arg always ctxk"); | |
| 575 } | |
| 576 for (int j = 0; j < stride; j++) { | |
| 577 _xi[j] = (j == skipj)? 0: _bytes.read_int(); | |
| 578 } | |
| 579 DEBUG_ONLY(_xi[stride] = -1); // help detect overruns | |
| 580 return true; | |
| 581 } | |
| 582 } | |
| 583 | |
| 584 inline oop Dependencies::DepStream::recorded_oop_at(int i) { | |
| 585 return (_code != NULL) | |
| 586 ? _code->oop_at(i) | |
| 587 : JNIHandles::resolve(_deps->oop_recorder()->handle_at(i)); | |
| 588 } | |
| 589 | |
| 590 oop Dependencies::DepStream::argument(int i) { | |
| 591 return recorded_oop_at(argument_index(i)); | |
| 592 } | |
| 593 | |
| 594 klassOop Dependencies::DepStream::context_type() { | |
| 595 assert(must_be_in_vm(), "raw oops here"); | |
| 596 int ctxkj = dep_context_arg(_type); // -1 if no context arg | |
| 597 if (ctxkj < 0) { | |
| 598 return NULL; // for example, evol_method | |
| 599 } else { | |
| 600 oop k = recorded_oop_at(_xi[ctxkj]); | |
| 601 if (k != NULL) { // context type was not compressed away | |
| 602 assert(k->is_klass(), "type check"); | |
| 603 return (klassOop) k; | |
| 604 } else { // recompute "default" context type | |
| 605 return ctxk_encoded_as_null(_type, recorded_oop_at(_xi[ctxkj+1])); | |
| 606 } | |
| 607 } | |
| 608 } | |
| 609 | |
| 610 /// Checking dependencies: | |
| 611 | |
| 612 // This hierarchy walker inspects subtypes of a given type, | |
| 613 // trying to find a "bad" class which breaks a dependency. | |
| 614 // Such a class is called a "witness" to the broken dependency. | |
| 615 // While searching around, we ignore "participants", which | |
| 616 // are already known to the dependency. | |
| 617 class ClassHierarchyWalker { | |
| 618 public: | |
| 619 enum { PARTICIPANT_LIMIT = 3 }; | |
| 620 | |
| 621 private: | |
| 622 // optional method descriptor to check for: | |
| 623 symbolOop _name; | |
| 624 symbolOop _signature; | |
| 625 | |
| 626 // special classes which are not allowed to be witnesses: | |
| 627 klassOop _participants[PARTICIPANT_LIMIT+1]; | |
| 628 int _num_participants; | |
| 629 | |
| 630 // cache of method lookups | |
| 631 methodOop _found_methods[PARTICIPANT_LIMIT+1]; | |
| 632 | |
| 633 // if non-zero, tells how many witnesses to convert to participants | |
| 634 int _record_witnesses; | |
| 635 | |
| 636 void initialize(klassOop participant) { | |
| 637 _record_witnesses = 0; | |
| 638 _participants[0] = participant; | |
| 639 _found_methods[0] = NULL; | |
| 640 _num_participants = 0; | |
| 641 if (participant != NULL) { | |
| 642 // Terminating NULL. | |
| 643 _participants[1] = NULL; | |
| 644 _found_methods[1] = NULL; | |
| 645 _num_participants = 1; | |
| 646 } | |
| 647 } | |
| 648 | |
| 649 void initialize_from_method(methodOop m) { | |
| 650 assert(m != NULL && m->is_method(), "sanity"); | |
| 651 _name = m->name(); | |
| 652 _signature = m->signature(); | |
| 653 } | |
| 654 | |
| 655 public: | |
| 656 // The walker is initialized to recognize certain methods and/or types | |
| 657 // as friendly participants. | |
| 658 ClassHierarchyWalker(klassOop participant, methodOop m) { | |
| 659 initialize_from_method(m); | |
| 660 initialize(participant); | |
| 661 } | |
| 662 ClassHierarchyWalker(methodOop m) { | |
| 663 initialize_from_method(m); | |
| 664 initialize(NULL); | |
| 665 } | |
| 666 ClassHierarchyWalker(klassOop participant = NULL) { | |
| 667 _name = NULL; | |
| 668 _signature = NULL; | |
| 669 initialize(participant); | |
| 670 } | |
| 671 | |
| 672 // This is common code for two searches: One for concrete subtypes, | |
| 673 // the other for concrete method implementations and overrides. | |
| 674 bool doing_subtype_search() { | |
| 675 return _name == NULL; | |
| 676 } | |
| 677 | |
| 678 int num_participants() { return _num_participants; } | |
| 679 klassOop participant(int n) { | |
| 680 assert((uint)n <= (uint)_num_participants, "oob"); | |
| 681 return _participants[n]; | |
| 682 } | |
| 683 | |
| 684 // Note: If n==num_participants, returns NULL. | |
| 685 methodOop found_method(int n) { | |
| 686 assert((uint)n <= (uint)_num_participants, "oob"); | |
| 687 methodOop fm = _found_methods[n]; | |
| 688 assert(n == _num_participants || fm != NULL, "proper usage"); | |
| 689 assert(fm == NULL || fm->method_holder() == _participants[n], "sanity"); | |
| 690 return fm; | |
| 691 } | |
| 692 | |
| 693 #ifdef ASSERT | |
| 694 // Assert that m is inherited into ctxk, without intervening overrides. | |
| 695 // (May return true even if this is not true, in corner cases where we punt.) | |
| 696 bool check_method_context(klassOop ctxk, methodOop m) { | |
| 697 if (m->method_holder() == ctxk) | |
| 698 return true; // Quick win. | |
| 699 if (m->is_private()) | |
| 700 return false; // Quick lose. Should not happen. | |
| 701 if (!(m->is_public() || m->is_protected())) | |
| 702 // The override story is complex when packages get involved. | |
| 703 return true; // Must punt the assertion to true. | |
| 704 Klass* k = Klass::cast(ctxk); | |
| 705 methodOop lm = k->lookup_method(m->name(), m->signature()); | |
| 706 if (lm == NULL && k->oop_is_instance()) { | |
| 707 // It might be an abstract interface method, devoid of mirandas. | |
| 708 lm = ((instanceKlass*)k)->lookup_method_in_all_interfaces(m->name(), | |
| 709 m->signature()); | |
| 710 } | |
| 711 if (lm == m) | |
| 712 // Method m is inherited into ctxk. | |
| 713 return true; | |
| 714 if (lm != NULL) { | |
| 715 if (!(lm->is_public() || lm->is_protected())) | |
| 716 // Method is [package-]private, so the override story is complex. | |
| 717 return true; // Must punt the assertion to true. | |
| 718 if ( !Dependencies::is_concrete_method(lm) | |
| 719 && !Dependencies::is_concrete_method(m) | |
| 720 && Klass::cast(lm->method_holder())->is_subtype_of(m->method_holder())) | |
| 721 // Method m is overridden by lm, but both are non-concrete. | |
| 722 return true; | |
| 723 } | |
| 724 ResourceMark rm; | |
| 725 tty->print_cr("Dependency method not found in the associated context:"); | |
| 726 tty->print_cr(" context = %s", Klass::cast(ctxk)->external_name()); | |
| 727 tty->print( " method = "); m->print_short_name(tty); tty->cr(); | |
| 728 if (lm != NULL) { | |
| 729 tty->print( " found = "); lm->print_short_name(tty); tty->cr(); | |
| 730 } | |
| 731 return false; | |
| 732 } | |
| 733 #endif | |
| 734 | |
| 735 void add_participant(klassOop participant) { | |
| 736 assert(_num_participants + _record_witnesses < PARTICIPANT_LIMIT, "oob"); | |
| 737 int np = _num_participants++; | |
| 738 _participants[np] = participant; | |
| 739 _participants[np+1] = NULL; | |
| 740 _found_methods[np+1] = NULL; | |
| 741 } | |
| 742 | |
| 743 void record_witnesses(int add) { | |
| 744 if (add > PARTICIPANT_LIMIT) add = PARTICIPANT_LIMIT; | |
| 745 assert(_num_participants + add < PARTICIPANT_LIMIT, "oob"); | |
| 746 _record_witnesses = add; | |
| 747 } | |
| 748 | |
| 749 bool is_witness(klassOop k) { | |
| 750 if (doing_subtype_search()) { | |
| 751 return Dependencies::is_concrete_klass(k); | |
| 752 } else { | |
| 753 methodOop m = instanceKlass::cast(k)->find_method(_name, _signature); | |
| 754 if (m == NULL || !Dependencies::is_concrete_method(m)) return false; | |
| 755 _found_methods[_num_participants] = m; | |
| 756 // Note: If add_participant(k) is called, | |
| 757 // the method m will already be memoized for it. | |
| 758 return true; | |
| 759 } | |
| 760 } | |
| 761 | |
| 762 bool is_participant(klassOop k) { | |
| 763 if (k == _participants[0]) { | |
| 764 return true; | |
| 765 } else if (_num_participants <= 1) { | |
| 766 return false; | |
| 767 } else { | |
| 768 return in_list(k, &_participants[1]); | |
| 769 } | |
| 770 } | |
| 771 bool ignore_witness(klassOop witness) { | |
| 772 if (_record_witnesses == 0) { | |
| 773 return false; | |
| 774 } else { | |
| 775 --_record_witnesses; | |
| 776 add_participant(witness); | |
| 777 return true; | |
| 778 } | |
| 779 } | |
| 780 static bool in_list(klassOop x, klassOop* list) { | |
| 781 for (int i = 0; ; i++) { | |
| 782 klassOop y = list[i]; | |
| 783 if (y == NULL) break; | |
| 784 if (y == x) return true; | |
| 785 } | |
| 786 return false; // not in list | |
| 787 } | |
| 788 | |
| 789 private: | |
| 790 // the actual search method: | |
| 791 klassOop find_witness_anywhere(klassOop context_type, | |
| 792 bool participants_hide_witnesses, | |
| 793 bool top_level_call = true); | |
| 794 // the spot-checking version: | |
| 795 klassOop find_witness_in(DepChange& changes, | |
| 796 klassOop context_type, | |
| 797 bool participants_hide_witnesses); | |
| 798 public: | |
| 799 klassOop find_witness_subtype(klassOop context_type, DepChange* changes = NULL) { | |
| 800 assert(doing_subtype_search(), "must set up a subtype search"); | |
| 801 // When looking for unexpected concrete types, | |
| 802 // do not look beneath expected ones. | |
| 803 const bool participants_hide_witnesses = true; | |
| 804 // CX > CC > C' is OK, even if C' is new. | |
| 805 // CX > { CC, C' } is not OK if C' is new, and C' is the witness. | |
| 806 if (changes != NULL) { | |
| 807 return find_witness_in(*changes, context_type, participants_hide_witnesses); | |
| 808 } else { | |
| 809 return find_witness_anywhere(context_type, participants_hide_witnesses); | |
| 810 } | |
| 811 } | |
| 812 klassOop find_witness_definer(klassOop context_type, DepChange* changes = NULL) { | |
| 813 assert(!doing_subtype_search(), "must set up a method definer search"); | |
| 814 // When looking for unexpected concrete methods, | |
| 815 // look beneath expected ones, to see if there are overrides. | |
| 816 const bool participants_hide_witnesses = true; | |
| 817 // CX.m > CC.m > C'.m is not OK, if C'.m is new, and C' is the witness. | |
| 818 if (changes != NULL) { | |
| 819 return find_witness_in(*changes, context_type, !participants_hide_witnesses); | |
| 820 } else { | |
| 821 return find_witness_anywhere(context_type, !participants_hide_witnesses); | |
| 822 } | |
| 823 } | |
| 824 }; | |
| 825 | |
| 826 #ifndef PRODUCT | |
| 827 static int deps_find_witness_calls = 0; | |
| 828 static int deps_find_witness_steps = 0; | |
| 829 static int deps_find_witness_recursions = 0; | |
| 830 static int deps_find_witness_singles = 0; | |
| 831 static int deps_find_witness_print = 0; // set to -1 to force a final print | |
| 832 static bool count_find_witness_calls() { | |
| 833 if (TraceDependencies || LogCompilation) { | |
| 834 int pcount = deps_find_witness_print + 1; | |
| 835 bool final_stats = (pcount == 0); | |
| 836 bool initial_call = (pcount == 1); | |
| 837 bool occasional_print = ((pcount & ((1<<10) - 1)) == 0); | |
| 838 if (pcount < 0) pcount = 1; // crude overflow protection | |
| 839 deps_find_witness_print = pcount; | |
| 840 if (VerifyDependencies && initial_call) { | |
| 841 tty->print_cr("Warning: TraceDependencies results may be inflated by VerifyDependencies"); | |
| 842 } | |
| 843 if (occasional_print || final_stats) { | |
| 844 // Every now and then dump a little info about dependency searching. | |
| 845 if (xtty != NULL) { | |
|
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846 ttyLocker ttyl; |
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847 xtty->elem("deps_find_witness calls='%d' steps='%d' recursions='%d' singles='%d'", |
| 0 | 848 deps_find_witness_calls, |
| 849 deps_find_witness_steps, | |
| 850 deps_find_witness_recursions, | |
| 851 deps_find_witness_singles); | |
| 852 } | |
| 853 if (final_stats || (TraceDependencies && WizardMode)) { | |
|
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854 ttyLocker ttyl; |
| 0 | 855 tty->print_cr("Dependency check (find_witness) " |
| 856 "calls=%d, steps=%d (avg=%.1f), recursions=%d, singles=%d", | |
| 857 deps_find_witness_calls, | |
| 858 deps_find_witness_steps, | |
| 859 (double)deps_find_witness_steps / deps_find_witness_calls, | |
| 860 deps_find_witness_recursions, | |
| 861 deps_find_witness_singles); | |
| 862 } | |
| 863 } | |
| 864 return true; | |
| 865 } | |
| 866 return false; | |
| 867 } | |
| 868 #else | |
| 869 #define count_find_witness_calls() (0) | |
| 870 #endif //PRODUCT | |
| 871 | |
| 872 | |
| 873 klassOop ClassHierarchyWalker::find_witness_in(DepChange& changes, | |
| 874 klassOop context_type, | |
| 875 bool participants_hide_witnesses) { | |
| 876 assert(changes.involves_context(context_type), "irrelevant dependency"); | |
| 877 klassOop new_type = changes.new_type(); | |
| 878 | |
| 879 count_find_witness_calls(); | |
| 880 NOT_PRODUCT(deps_find_witness_singles++); | |
| 881 | |
| 882 // Current thread must be in VM (not native mode, as in CI): | |
| 883 assert(must_be_in_vm(), "raw oops here"); | |
| 884 // Must not move the class hierarchy during this check: | |
| 885 assert_locked_or_safepoint(Compile_lock); | |
| 886 | |
| 30 | 887 int nof_impls = instanceKlass::cast(context_type)->nof_implementors(); |
| 888 if (nof_impls > 1) { | |
| 889 // Avoid this case: *I.m > { A.m, C }; B.m > C | |
| 890 // %%% Until this is fixed more systematically, bail out. | |
| 891 // See corresponding comment in find_witness_anywhere. | |
| 892 return context_type; | |
| 893 } | |
| 894 | |
| 0 | 895 assert(!is_participant(new_type), "only old classes are participants"); |
| 896 if (participants_hide_witnesses) { | |
| 897 // If the new type is a subtype of a participant, we are done. | |
| 898 for (int i = 0; i < num_participants(); i++) { | |
| 899 klassOop part = participant(i); | |
| 900 if (part == NULL) continue; | |
| 901 assert(changes.involves_context(part) == Klass::cast(new_type)->is_subtype_of(part), | |
| 902 "correct marking of participants, b/c new_type is unique"); | |
| 903 if (changes.involves_context(part)) { | |
| 904 // new guy is protected from this check by previous participant | |
| 905 return NULL; | |
| 906 } | |
| 907 } | |
| 908 } | |
| 909 | |
| 910 if (is_witness(new_type) && | |
| 911 !ignore_witness(new_type)) { | |
| 912 return new_type; | |
| 913 } | |
| 914 | |
| 915 return NULL; | |
| 916 } | |
| 917 | |
| 918 | |
| 919 // Walk hierarchy under a context type, looking for unexpected types. | |
| 920 // Do not report participant types, and recursively walk beneath | |
| 921 // them only if participants_hide_witnesses is false. | |
| 922 // If top_level_call is false, skip testing the context type, | |
| 923 // because the caller has already considered it. | |
| 924 klassOop ClassHierarchyWalker::find_witness_anywhere(klassOop context_type, | |
| 925 bool participants_hide_witnesses, | |
| 926 bool top_level_call) { | |
| 927 // Current thread must be in VM (not native mode, as in CI): | |
| 928 assert(must_be_in_vm(), "raw oops here"); | |
| 929 // Must not move the class hierarchy during this check: | |
| 930 assert_locked_or_safepoint(Compile_lock); | |
| 931 | |
| 932 bool do_counts = count_find_witness_calls(); | |
| 933 | |
| 934 // Check the root of the sub-hierarchy first. | |
| 935 if (top_level_call) { | |
| 936 if (do_counts) { | |
| 937 NOT_PRODUCT(deps_find_witness_calls++); | |
| 938 NOT_PRODUCT(deps_find_witness_steps++); | |
| 939 } | |
| 940 if (is_participant(context_type)) { | |
| 941 if (participants_hide_witnesses) return NULL; | |
| 942 // else fall through to search loop... | |
| 943 } else if (is_witness(context_type) && !ignore_witness(context_type)) { | |
| 944 // The context is an abstract class or interface, to start with. | |
| 945 return context_type; | |
| 946 } | |
| 947 } | |
| 948 | |
| 949 // Now we must check each implementor and each subclass. | |
| 950 // Use a short worklist to avoid blowing the stack. | |
| 951 // Each worklist entry is a *chain* of subklass siblings to process. | |
| 952 const int CHAINMAX = 100; // >= 1 + instanceKlass::implementors_limit | |
| 953 Klass* chains[CHAINMAX]; | |
| 954 int chaini = 0; // index into worklist | |
| 955 Klass* chain; // scratch variable | |
| 956 #define ADD_SUBCLASS_CHAIN(k) { \ | |
| 957 assert(chaini < CHAINMAX, "oob"); \ | |
| 958 chain = instanceKlass::cast(k)->subklass(); \ | |
| 959 if (chain != NULL) chains[chaini++] = chain; } | |
| 960 | |
| 961 // Look for non-abstract subclasses. | |
| 962 // (Note: Interfaces do not have subclasses.) | |
| 963 ADD_SUBCLASS_CHAIN(context_type); | |
| 964 | |
| 965 // If it is an interface, search its direct implementors. | |
| 966 // (Their subclasses are additional indirect implementors. | |
| 967 // See instanceKlass::add_implementor.) | |
| 968 // (Note: nof_implementors is always zero for non-interfaces.) | |
| 969 int nof_impls = instanceKlass::cast(context_type)->nof_implementors(); | |
| 970 if (nof_impls > 1) { | |
| 971 // Avoid this case: *I.m > { A.m, C }; B.m > C | |
| 972 // Here, I.m has 2 concrete implementations, but m appears unique | |
| 973 // as A.m, because the search misses B.m when checking C. | |
| 974 // The inherited method B.m was getting missed by the walker | |
| 975 // when interface 'I' was the starting point. | |
| 976 // %%% Until this is fixed more systematically, bail out. | |
| 977 // (Old CHA had the same limitation.) | |
| 978 return context_type; | |
| 979 } | |
| 980 for (int i = 0; i < nof_impls; i++) { | |
| 981 klassOop impl = instanceKlass::cast(context_type)->implementor(i); | |
| 982 if (impl == NULL) { | |
| 983 // implementors array overflowed => no exact info. | |
| 984 return context_type; // report an inexact witness to this sad affair | |
| 985 } | |
| 986 if (do_counts) | |
| 987 { NOT_PRODUCT(deps_find_witness_steps++); } | |
| 988 if (is_participant(impl)) { | |
| 989 if (participants_hide_witnesses) continue; | |
| 990 // else fall through to process this guy's subclasses | |
| 991 } else if (is_witness(impl) && !ignore_witness(impl)) { | |
| 992 return impl; | |
| 993 } | |
| 994 ADD_SUBCLASS_CHAIN(impl); | |
| 995 } | |
| 996 | |
| 997 // Recursively process each non-trivial sibling chain. | |
| 998 while (chaini > 0) { | |
| 999 Klass* chain = chains[--chaini]; | |
| 1000 for (Klass* subk = chain; subk != NULL; subk = subk->next_sibling()) { | |
| 1001 klassOop sub = subk->as_klassOop(); | |
| 1002 if (do_counts) { NOT_PRODUCT(deps_find_witness_steps++); } | |
| 1003 if (is_participant(sub)) { | |
| 1004 if (participants_hide_witnesses) continue; | |
| 1005 // else fall through to process this guy's subclasses | |
| 1006 } else if (is_witness(sub) && !ignore_witness(sub)) { | |
| 1007 return sub; | |
| 1008 } | |
| 1009 if (chaini < (VerifyDependencies? 2: CHAINMAX)) { | |
| 1010 // Fast path. (Partially disabled if VerifyDependencies.) | |
| 1011 ADD_SUBCLASS_CHAIN(sub); | |
| 1012 } else { | |
| 1013 // Worklist overflow. Do a recursive call. Should be rare. | |
| 1014 // The recursive call will have its own worklist, of course. | |
| 1015 // (Note that sub has already been tested, so that there is | |
| 1016 // no need for the recursive call to re-test. That's handy, | |
| 1017 // since the recursive call sees sub as the context_type.) | |
| 1018 if (do_counts) { NOT_PRODUCT(deps_find_witness_recursions++); } | |
| 1019 klassOop witness = find_witness_anywhere(sub, | |
| 1020 participants_hide_witnesses, | |
| 1021 /*top_level_call=*/ false); | |
| 1022 if (witness != NULL) return witness; | |
| 1023 } | |
| 1024 } | |
| 1025 } | |
| 1026 | |
| 1027 // No witness found. The dependency remains unbroken. | |
| 1028 return NULL; | |
| 1029 #undef ADD_SUBCLASS_CHAIN | |
| 1030 } | |
| 1031 | |
| 1032 | |
| 1033 bool Dependencies::is_concrete_klass(klassOop k) { | |
| 1034 if (Klass::cast(k)->is_abstract()) return false; | |
| 1035 // %%% We could treat classes which are concrete but | |
| 1036 // have not yet been instantiated as virtually abstract. | |
| 1037 // This would require a deoptimization barrier on first instantiation. | |
| 1038 //if (k->is_not_instantiated()) return false; | |
| 1039 return true; | |
| 1040 } | |
| 1041 | |
| 1042 bool Dependencies::is_concrete_method(methodOop m) { | |
| 1043 if (m->is_abstract()) return false; | |
| 1044 // %%% We could treat unexecuted methods as virtually abstract also. | |
| 1045 // This would require a deoptimization barrier on first execution. | |
| 1046 return !m->is_abstract(); | |
| 1047 } | |
| 1048 | |
| 1049 | |
| 1050 Klass* Dependencies::find_finalizable_subclass(Klass* k) { | |
| 1051 if (k->is_interface()) return NULL; | |
| 1052 if (k->has_finalizer()) return k; | |
| 1053 k = k->subklass(); | |
| 1054 while (k != NULL) { | |
| 1055 Klass* result = find_finalizable_subclass(k); | |
| 1056 if (result != NULL) return result; | |
| 1057 k = k->next_sibling(); | |
| 1058 } | |
| 1059 return NULL; | |
| 1060 } | |
| 1061 | |
| 1062 | |
| 1063 bool Dependencies::is_concrete_klass(ciInstanceKlass* k) { | |
| 1064 if (k->is_abstract()) return false; | |
| 1065 // We could return also false if k does not yet appear to be | |
| 1066 // instantiated, if the VM version supports this distinction also. | |
| 1067 //if (k->is_not_instantiated()) return false; | |
| 1068 return true; | |
| 1069 } | |
| 1070 | |
| 1071 bool Dependencies::is_concrete_method(ciMethod* m) { | |
| 1072 // Statics are irrelevant to virtual call sites. | |
| 1073 if (m->is_static()) return false; | |
| 1074 | |
| 1075 // We could return also false if m does not yet appear to be | |
| 1076 // executed, if the VM version supports this distinction also. | |
| 1077 return !m->is_abstract(); | |
| 1078 } | |
| 1079 | |
| 1080 | |
| 1081 bool Dependencies::has_finalizable_subclass(ciInstanceKlass* k) { | |
| 1082 return k->has_finalizable_subclass(); | |
| 1083 } | |
| 1084 | |
| 1085 | |
| 1086 // Any use of the contents (bytecodes) of a method must be | |
| 1087 // marked by an "evol_method" dependency, if those contents | |
| 1088 // can change. (Note: A method is always dependent on itself.) | |
| 1089 klassOop Dependencies::check_evol_method(methodOop m) { | |
| 1090 assert(must_be_in_vm(), "raw oops here"); | |
| 1091 // Did somebody do a JVMTI RedefineClasses while our backs were turned? | |
| 1092 // Or is there a now a breakpoint? | |
| 1093 // (Assumes compiled code cannot handle bkpts; change if UseFastBreakpoints.) | |
| 1094 if (m->is_old() | |
| 1095 || m->number_of_breakpoints() > 0) { | |
| 1096 return m->method_holder(); | |
| 1097 } else { | |
| 1098 return NULL; | |
| 1099 } | |
| 1100 } | |
| 1101 | |
| 1102 // This is a strong assertion: It is that the given type | |
| 1103 // has no subtypes whatever. It is most useful for | |
| 1104 // optimizing checks on reflected types or on array types. | |
| 1105 // (Checks on types which are derived from real instances | |
| 1106 // can be optimized more strongly than this, because we | |
| 1107 // know that the checked type comes from a concrete type, | |
| 1108 // and therefore we can disregard abstract types.) | |
| 1109 klassOop Dependencies::check_leaf_type(klassOop ctxk) { | |
| 1110 assert(must_be_in_vm(), "raw oops here"); | |
| 1111 assert_locked_or_safepoint(Compile_lock); | |
| 1112 instanceKlass* ctx = instanceKlass::cast(ctxk); | |
| 1113 Klass* sub = ctx->subklass(); | |
| 1114 if (sub != NULL) { | |
| 1115 return sub->as_klassOop(); | |
| 1116 } else if (ctx->nof_implementors() != 0) { | |
| 1117 // if it is an interface, it must be unimplemented | |
| 1118 // (if it is not an interface, nof_implementors is always zero) | |
| 1119 klassOop impl = ctx->implementor(0); | |
| 1120 return (impl != NULL)? impl: ctxk; | |
| 1121 } else { | |
| 1122 return NULL; | |
| 1123 } | |
| 1124 } | |
| 1125 | |
| 1126 // Test the assertion that conck is the only concrete subtype* of ctxk. | |
| 1127 // The type conck itself is allowed to have have further concrete subtypes. | |
| 1128 // This allows the compiler to narrow occurrences of ctxk by conck, | |
| 1129 // when dealing with the types of actual instances. | |
| 1130 klassOop Dependencies::check_abstract_with_unique_concrete_subtype(klassOop ctxk, | |
| 1131 klassOop conck, | |
| 1132 DepChange* changes) { | |
| 1133 ClassHierarchyWalker wf(conck); | |
| 1134 return wf.find_witness_subtype(ctxk, changes); | |
| 1135 } | |
| 1136 | |
| 1137 // If a non-concrete class has no concrete subtypes, it is not (yet) | |
| 1138 // instantiatable. This can allow the compiler to make some paths go | |
| 1139 // dead, if they are gated by a test of the type. | |
| 1140 klassOop Dependencies::check_abstract_with_no_concrete_subtype(klassOop ctxk, | |
| 1141 DepChange* changes) { | |
| 1142 // Find any concrete subtype, with no participants: | |
| 1143 ClassHierarchyWalker wf; | |
| 1144 return wf.find_witness_subtype(ctxk, changes); | |
| 1145 } | |
| 1146 | |
| 1147 | |
| 1148 // If a concrete class has no concrete subtypes, it can always be | |
| 1149 // exactly typed. This allows the use of a cheaper type test. | |
| 1150 klassOop Dependencies::check_concrete_with_no_concrete_subtype(klassOop ctxk, | |
| 1151 DepChange* changes) { | |
| 1152 // Find any concrete subtype, with only the ctxk as participant: | |
| 1153 ClassHierarchyWalker wf(ctxk); | |
| 1154 return wf.find_witness_subtype(ctxk, changes); | |
| 1155 } | |
| 1156 | |
| 1157 | |
| 1158 // Find the unique concrete proper subtype of ctxk, or NULL if there | |
| 1159 // is more than one concrete proper subtype. If there are no concrete | |
| 1160 // proper subtypes, return ctxk itself, whether it is concrete or not. | |
| 1161 // The returned subtype is allowed to have have further concrete subtypes. | |
| 1162 // That is, return CC1 for CX > CC1 > CC2, but NULL for CX > { CC1, CC2 }. | |
| 1163 klassOop Dependencies::find_unique_concrete_subtype(klassOop ctxk) { | |
| 1164 ClassHierarchyWalker wf(ctxk); // Ignore ctxk when walking. | |
| 1165 wf.record_witnesses(1); // Record one other witness when walking. | |
| 1166 klassOop wit = wf.find_witness_subtype(ctxk); | |
| 1167 if (wit != NULL) return NULL; // Too many witnesses. | |
| 1168 klassOop conck = wf.participant(0); | |
| 1169 if (conck == NULL) { | |
| 1170 #ifndef PRODUCT | |
| 1171 // Make sure the dependency mechanism will pass this discovery: | |
| 1172 if (VerifyDependencies) { | |
| 1173 // Turn off dependency tracing while actually testing deps. | |
| 1174 FlagSetting fs(TraceDependencies, false); | |
| 1175 if (!Dependencies::is_concrete_klass(ctxk)) { | |
| 1176 guarantee(NULL == | |
| 1177 (void *)check_abstract_with_no_concrete_subtype(ctxk), | |
| 1178 "verify dep."); | |
| 1179 } else { | |
| 1180 guarantee(NULL == | |
| 1181 (void *)check_concrete_with_no_concrete_subtype(ctxk), | |
| 1182 "verify dep."); | |
| 1183 } | |
| 1184 } | |
| 1185 #endif //PRODUCT | |
| 1186 return ctxk; // Return ctxk as a flag for "no subtypes". | |
| 1187 } else { | |
| 1188 #ifndef PRODUCT | |
| 1189 // Make sure the dependency mechanism will pass this discovery: | |
| 1190 if (VerifyDependencies) { | |
| 1191 // Turn off dependency tracing while actually testing deps. | |
| 1192 FlagSetting fs(TraceDependencies, false); | |
| 1193 if (!Dependencies::is_concrete_klass(ctxk)) { | |
| 1194 guarantee(NULL == (void *) | |
| 1195 check_abstract_with_unique_concrete_subtype(ctxk, conck), | |
| 1196 "verify dep."); | |
| 1197 } | |
| 1198 } | |
| 1199 #endif //PRODUCT | |
| 1200 return conck; | |
| 1201 } | |
| 1202 } | |
| 1203 | |
| 1204 // Test the assertion that the k[12] are the only concrete subtypes of ctxk, | |
| 1205 // except possibly for further subtypes of k[12] themselves. | |
| 1206 // The context type must be abstract. The types k1 and k2 are themselves | |
| 1207 // allowed to have further concrete subtypes. | |
| 1208 klassOop Dependencies::check_abstract_with_exclusive_concrete_subtypes( | |
| 1209 klassOop ctxk, | |
| 1210 klassOop k1, | |
| 1211 klassOop k2, | |
| 1212 DepChange* changes) { | |
| 1213 ClassHierarchyWalker wf; | |
| 1214 wf.add_participant(k1); | |
| 1215 wf.add_participant(k2); | |
| 1216 return wf.find_witness_subtype(ctxk, changes); | |
| 1217 } | |
| 1218 | |
| 1219 // Search ctxk for concrete implementations. If there are klen or fewer, | |
| 1220 // pack them into the given array and return the number. | |
| 1221 // Otherwise, return -1, meaning the given array would overflow. | |
| 1222 // (Note that a return of 0 means there are exactly no concrete subtypes.) | |
| 1223 // In this search, if ctxk is concrete, it will be reported alone. | |
| 1224 // For any type CC reported, no proper subtypes of CC will be reported. | |
| 1225 int Dependencies::find_exclusive_concrete_subtypes(klassOop ctxk, | |
| 1226 int klen, | |
| 1227 klassOop karray[]) { | |
| 1228 ClassHierarchyWalker wf; | |
| 1229 wf.record_witnesses(klen); | |
| 1230 klassOop wit = wf.find_witness_subtype(ctxk); | |
| 1231 if (wit != NULL) return -1; // Too many witnesses. | |
| 1232 int num = wf.num_participants(); | |
| 1233 assert(num <= klen, "oob"); | |
| 1234 // Pack the result array with the good news. | |
| 1235 for (int i = 0; i < num; i++) | |
| 1236 karray[i] = wf.participant(i); | |
| 1237 #ifndef PRODUCT | |
| 1238 // Make sure the dependency mechanism will pass this discovery: | |
| 1239 if (VerifyDependencies) { | |
| 1240 // Turn off dependency tracing while actually testing deps. | |
| 1241 FlagSetting fs(TraceDependencies, false); | |
| 1242 switch (Dependencies::is_concrete_klass(ctxk)? -1: num) { | |
| 1243 case -1: // ctxk was itself concrete | |
| 1244 guarantee(num == 1 && karray[0] == ctxk, "verify dep."); | |
| 1245 break; | |
| 1246 case 0: | |
| 1247 guarantee(NULL == (void *)check_abstract_with_no_concrete_subtype(ctxk), | |
| 1248 "verify dep."); | |
| 1249 break; | |
| 1250 case 1: | |
| 1251 guarantee(NULL == (void *) | |
| 1252 check_abstract_with_unique_concrete_subtype(ctxk, karray[0]), | |
| 1253 "verify dep."); | |
| 1254 break; | |
| 1255 case 2: | |
| 1256 guarantee(NULL == (void *) | |
| 1257 check_abstract_with_exclusive_concrete_subtypes(ctxk, | |
| 1258 karray[0], | |
| 1259 karray[1]), | |
| 1260 "verify dep."); | |
| 1261 break; | |
| 1262 default: | |
| 1263 ShouldNotReachHere(); // klen > 2 yet supported | |
| 1264 } | |
| 1265 } | |
| 1266 #endif //PRODUCT | |
| 1267 return num; | |
| 1268 } | |
| 1269 | |
| 1270 // If a class (or interface) has a unique concrete method uniqm, return NULL. | |
| 1271 // Otherwise, return a class that contains an interfering method. | |
| 1272 klassOop Dependencies::check_unique_concrete_method(klassOop ctxk, methodOop uniqm, | |
| 1273 DepChange* changes) { | |
| 1274 // Here is a missing optimization: If uniqm->is_final(), | |
| 1275 // we don't really need to search beneath it for overrides. | |
| 1276 // This is probably not important, since we don't use dependencies | |
| 1277 // to track final methods. (They can't be "definalized".) | |
| 1278 ClassHierarchyWalker wf(uniqm->method_holder(), uniqm); | |
| 1279 return wf.find_witness_definer(ctxk, changes); | |
| 1280 } | |
| 1281 | |
| 1282 // Find the set of all non-abstract methods under ctxk that match m. | |
| 1283 // (The method m must be defined or inherited in ctxk.) | |
| 1284 // Include m itself in the set, unless it is abstract. | |
| 1285 // If this set has exactly one element, return that element. | |
| 1286 methodOop Dependencies::find_unique_concrete_method(klassOop ctxk, methodOop m) { | |
| 1287 ClassHierarchyWalker wf(m); | |
| 1288 assert(wf.check_method_context(ctxk, m), "proper context"); | |
| 1289 wf.record_witnesses(1); | |
| 1290 klassOop wit = wf.find_witness_definer(ctxk); | |
| 1291 if (wit != NULL) return NULL; // Too many witnesses. | |
| 1292 methodOop fm = wf.found_method(0); // Will be NULL if num_parts == 0. | |
| 1293 if (Dependencies::is_concrete_method(m)) { | |
| 1294 if (fm == NULL) { | |
| 1295 // It turns out that m was always the only implementation. | |
| 1296 fm = m; | |
| 1297 } else if (fm != m) { | |
| 1298 // Two conflicting implementations after all. | |
| 1299 // (This can happen if m is inherited into ctxk and fm overrides it.) | |
| 1300 return NULL; | |
| 1301 } | |
| 1302 } | |
| 1303 #ifndef PRODUCT | |
| 1304 // Make sure the dependency mechanism will pass this discovery: | |
| 1305 if (VerifyDependencies && fm != NULL) { | |
| 1306 guarantee(NULL == (void *)check_unique_concrete_method(ctxk, fm), | |
| 1307 "verify dep."); | |
| 1308 } | |
| 1309 #endif //PRODUCT | |
| 1310 return fm; | |
| 1311 } | |
| 1312 | |
| 1313 klassOop Dependencies::check_exclusive_concrete_methods(klassOop ctxk, | |
| 1314 methodOop m1, | |
| 1315 methodOop m2, | |
| 1316 DepChange* changes) { | |
| 1317 ClassHierarchyWalker wf(m1); | |
| 1318 wf.add_participant(m1->method_holder()); | |
| 1319 wf.add_participant(m2->method_holder()); | |
| 1320 return wf.find_witness_definer(ctxk, changes); | |
| 1321 } | |
| 1322 | |
| 1323 // Find the set of all non-abstract methods under ctxk that match m[0]. | |
| 1324 // (The method m[0] must be defined or inherited in ctxk.) | |
| 1325 // Include m itself in the set, unless it is abstract. | |
| 1326 // Fill the given array m[0..(mlen-1)] with this set, and return the length. | |
| 1327 // (The length may be zero if no concrete methods are found anywhere.) | |
| 1328 // If there are too many concrete methods to fit in marray, return -1. | |
| 1329 int Dependencies::find_exclusive_concrete_methods(klassOop ctxk, | |
| 1330 int mlen, | |
| 1331 methodOop marray[]) { | |
| 1332 methodOop m0 = marray[0]; | |
| 1333 ClassHierarchyWalker wf(m0); | |
| 1334 assert(wf.check_method_context(ctxk, m0), "proper context"); | |
| 1335 wf.record_witnesses(mlen); | |
| 1336 bool participants_hide_witnesses = true; | |
| 1337 klassOop wit = wf.find_witness_definer(ctxk); | |
| 1338 if (wit != NULL) return -1; // Too many witnesses. | |
| 1339 int num = wf.num_participants(); | |
| 1340 assert(num <= mlen, "oob"); | |
| 1341 // Keep track of whether m is also part of the result set. | |
| 1342 int mfill = 0; | |
| 1343 assert(marray[mfill] == m0, "sanity"); | |
| 1344 if (Dependencies::is_concrete_method(m0)) | |
| 1345 mfill++; // keep m0 as marray[0], the first result | |
| 1346 for (int i = 0; i < num; i++) { | |
| 1347 methodOop fm = wf.found_method(i); | |
| 1348 if (fm == m0) continue; // Already put this guy in the list. | |
| 1349 if (mfill == mlen) { | |
| 1350 return -1; // Oops. Too many methods after all! | |
| 1351 } | |
| 1352 marray[mfill++] = fm; | |
| 1353 } | |
| 1354 #ifndef PRODUCT | |
| 1355 // Make sure the dependency mechanism will pass this discovery: | |
| 1356 if (VerifyDependencies) { | |
| 1357 // Turn off dependency tracing while actually testing deps. | |
| 1358 FlagSetting fs(TraceDependencies, false); | |
| 1359 switch (mfill) { | |
| 1360 case 1: | |
| 1361 guarantee(NULL == (void *)check_unique_concrete_method(ctxk, marray[0]), | |
| 1362 "verify dep."); | |
| 1363 break; | |
| 1364 case 2: | |
| 1365 guarantee(NULL == (void *) | |
| 1366 check_exclusive_concrete_methods(ctxk, marray[0], marray[1]), | |
| 1367 "verify dep."); | |
| 1368 break; | |
| 1369 default: | |
| 1370 ShouldNotReachHere(); // mlen > 2 yet supported | |
| 1371 } | |
| 1372 } | |
| 1373 #endif //PRODUCT | |
| 1374 return mfill; | |
| 1375 } | |
| 1376 | |
| 1377 | |
| 1378 klassOop Dependencies::check_has_no_finalizable_subclasses(klassOop ctxk, DepChange* changes) { | |
| 1379 Klass* search_at = ctxk->klass_part(); | |
| 1380 if (changes != NULL) | |
| 1381 search_at = changes->new_type()->klass_part(); // just look at the new bit | |
| 1382 Klass* result = find_finalizable_subclass(search_at); | |
| 1383 if (result == NULL) { | |
| 1384 return NULL; | |
| 1385 } | |
| 1386 return result->as_klassOop(); | |
| 1387 } | |
| 1388 | |
| 1389 | |
| 1390 klassOop Dependencies::DepStream::check_dependency_impl(DepChange* changes) { | |
| 1391 assert_locked_or_safepoint(Compile_lock); | |
| 1392 | |
| 1393 klassOop witness = NULL; | |
| 1394 switch (type()) { | |
| 1395 case evol_method: | |
| 1396 witness = check_evol_method(method_argument(0)); | |
| 1397 break; | |
| 1398 case leaf_type: | |
| 1399 witness = check_leaf_type(context_type()); | |
| 1400 break; | |
| 1401 case abstract_with_unique_concrete_subtype: | |
| 1402 witness = check_abstract_with_unique_concrete_subtype(context_type(), | |
| 1403 type_argument(1), | |
| 1404 changes); | |
| 1405 break; | |
| 1406 case abstract_with_no_concrete_subtype: | |
| 1407 witness = check_abstract_with_no_concrete_subtype(context_type(), | |
| 1408 changes); | |
| 1409 break; | |
| 1410 case concrete_with_no_concrete_subtype: | |
| 1411 witness = check_concrete_with_no_concrete_subtype(context_type(), | |
| 1412 changes); | |
| 1413 break; | |
| 1414 case unique_concrete_method: | |
| 1415 witness = check_unique_concrete_method(context_type(), | |
| 1416 method_argument(1), | |
| 1417 changes); | |
| 1418 break; | |
| 1419 case abstract_with_exclusive_concrete_subtypes_2: | |
| 1420 witness = check_abstract_with_exclusive_concrete_subtypes(context_type(), | |
| 1421 type_argument(1), | |
| 1422 type_argument(2), | |
| 1423 changes); | |
| 1424 break; | |
| 1425 case exclusive_concrete_methods_2: | |
| 1426 witness = check_exclusive_concrete_methods(context_type(), | |
| 1427 method_argument(1), | |
| 1428 method_argument(2), | |
| 1429 changes); | |
| 1430 break; | |
| 1431 case no_finalizable_subclasses: | |
| 1432 witness = check_has_no_finalizable_subclasses(context_type(), | |
| 1433 changes); | |
| 1434 break; | |
| 1435 default: | |
| 1436 witness = NULL; | |
| 1437 ShouldNotReachHere(); | |
| 1438 break; | |
| 1439 } | |
| 1440 if (witness != NULL) { | |
| 1441 if (TraceDependencies) { | |
| 1442 print_dependency(witness, /*verbose=*/ true); | |
| 1443 } | |
| 1444 // The following is a no-op unless logging is enabled: | |
| 1445 log_dependency(witness); | |
| 1446 } | |
| 1447 return witness; | |
| 1448 } | |
| 1449 | |
| 1450 | |
| 1451 klassOop Dependencies::DepStream::spot_check_dependency_at(DepChange& changes) { | |
| 1452 if (!changes.involves_context(context_type())) | |
| 1453 // irrelevant dependency; skip it | |
| 1454 return NULL; | |
| 1455 | |
| 1456 return check_dependency_impl(&changes); | |
| 1457 } | |
| 1458 | |
| 1459 | |
| 1460 void DepChange::initialize() { | |
| 1461 // entire transaction must be under this lock: | |
| 1462 assert_lock_strong(Compile_lock); | |
| 1463 | |
| 1464 // Mark all dependee and all its superclasses | |
| 1465 // Mark transitive interfaces | |
| 1466 for (ContextStream str(*this); str.next(); ) { | |
| 1467 klassOop d = str.klass(); | |
| 1468 assert(!instanceKlass::cast(d)->is_marked_dependent(), "checking"); | |
| 975 | 1469 instanceKlass::cast(d)->set_is_marked_dependent(true); |
| 0 | 1470 } |
| 1471 } | |
| 1472 | |
| 1473 DepChange::~DepChange() { | |
| 1474 // Unmark all dependee and all its superclasses | |
| 1475 // Unmark transitive interfaces | |
| 1476 for (ContextStream str(*this); str.next(); ) { | |
| 1477 klassOop d = str.klass(); | |
| 975 | 1478 instanceKlass::cast(d)->set_is_marked_dependent(false); |
| 0 | 1479 } |
| 1480 } | |
| 1481 | |
| 1482 bool DepChange::involves_context(klassOop k) { | |
| 1483 if (k == NULL || !Klass::cast(k)->oop_is_instance()) { | |
| 1484 return false; | |
| 1485 } | |
| 1486 instanceKlass* ik = instanceKlass::cast(k); | |
| 1487 bool is_contained = ik->is_marked_dependent(); | |
| 1488 assert(is_contained == Klass::cast(new_type())->is_subtype_of(k), | |
| 1489 "correct marking of potential context types"); | |
| 1490 return is_contained; | |
| 1491 } | |
| 1492 | |
| 1493 bool DepChange::ContextStream::next() { | |
| 1494 switch (_change_type) { | |
| 1495 case Start_Klass: // initial state; _klass is the new type | |
| 1496 _ti_base = instanceKlass::cast(_klass)->transitive_interfaces(); | |
| 1497 _ti_index = 0; | |
| 1498 _change_type = Change_new_type; | |
| 1499 return true; | |
| 1500 case Change_new_type: | |
| 1501 // fall through: | |
| 1502 _change_type = Change_new_sub; | |
| 1503 case Change_new_sub: | |
|
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1504 // 6598190: brackets workaround Sun Studio C++ compiler bug 6629277 |
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1505 { |
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1506 _klass = instanceKlass::cast(_klass)->super(); |
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1507 if (_klass != NULL) { |
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1508 return true; |
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1509 } |
| 0 | 1510 } |
| 1511 // else set up _ti_limit and fall through: | |
| 1512 _ti_limit = (_ti_base == NULL) ? 0 : _ti_base->length(); | |
| 1513 _change_type = Change_new_impl; | |
| 1514 case Change_new_impl: | |
| 1515 if (_ti_index < _ti_limit) { | |
| 1516 _klass = klassOop( _ti_base->obj_at(_ti_index++) ); | |
| 1517 return true; | |
| 1518 } | |
| 1519 // fall through: | |
| 1520 _change_type = NO_CHANGE; // iterator is exhausted | |
| 1521 case NO_CHANGE: | |
| 1522 break; | |
| 1523 default: | |
| 1524 ShouldNotReachHere(); | |
| 1525 } | |
| 1526 return false; | |
| 1527 } | |
| 1528 | |
| 1529 void DepChange::print() { | |
| 1530 int nsup = 0, nint = 0; | |
| 1531 for (ContextStream str(*this); str.next(); ) { | |
| 1532 klassOop k = str.klass(); | |
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1533 switch (str.change_type()) { |
| 0 | 1534 case Change_new_type: |
| 1535 tty->print_cr(" dependee = %s", instanceKlass::cast(k)->external_name()); | |
| 1536 break; | |
| 1537 case Change_new_sub: | |
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1538 if (!WizardMode) { |
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1539 ++nsup; |
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1540 } else { |
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1541 tty->print_cr(" context super = %s", instanceKlass::cast(k)->external_name()); |
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1542 } |
| 0 | 1543 break; |
| 1544 case Change_new_impl: | |
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1545 if (!WizardMode) { |
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1546 ++nint; |
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1547 } else { |
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1548 tty->print_cr(" context interface = %s", instanceKlass::cast(k)->external_name()); |
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1549 } |
| 0 | 1550 break; |
| 1551 } | |
| 1552 } | |
| 1553 if (nsup + nint != 0) { | |
| 1554 tty->print_cr(" context supers = %d, interfaces = %d", nsup, nint); | |
| 1555 } | |
| 1556 } | |
| 1557 | |
| 1558 #ifndef PRODUCT | |
| 1559 void Dependencies::print_statistics() { | |
| 1560 if (deps_find_witness_print != 0) { | |
| 1561 // Call one final time, to flush out the data. | |
| 1562 deps_find_witness_print = -1; | |
| 1563 count_find_witness_calls(); | |
| 1564 } | |
| 1565 } | |
| 1566 #endif |