Mercurial > hg > truffle
annotate src/share/vm/code/dependencies.cpp @ 20666:bee8095780db
8050079: crash while compiling java.lang.ref.Finalizer::runFinalizer
Summary: Ignore non-instance Klasses in the subclass hierarchy.
Reviewed-by: kvn, iignatyev, jrose
| author | thartmann |
|---|---|
| date | Thu, 20 Nov 2014 11:06:26 +0100 |
| parents | 3c048df3ef8b |
| children | c4f1e23c4139 41c3c456e326 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2005, 2013, 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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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" | |
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33 #include "runtime/handles.hpp" |
| 1972 | 34 #include "runtime/handles.inline.hpp" |
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35 #include "runtime/thread.inline.hpp" |
| 1972 | 36 #include "utilities/copy.hpp" |
| 0 | 37 |
| 38 | |
| 39 #ifdef ASSERT | |
| 40 static bool must_be_in_vm() { | |
| 41 Thread* thread = Thread::current(); | |
| 42 if (thread->is_Java_thread()) | |
| 43 return ((JavaThread*)thread)->thread_state() == _thread_in_vm; | |
| 44 else | |
| 45 return true; //something like this: thread->is_VM_thread(); | |
| 46 } | |
| 47 #endif //ASSERT | |
| 48 | |
| 49 void Dependencies::initialize(ciEnv* env) { | |
| 50 Arena* arena = env->arena(); | |
| 51 _oop_recorder = env->oop_recorder(); | |
| 52 _log = env->log(); | |
| 53 _dep_seen = new(arena) GrowableArray<int>(arena, 500, 0, 0); | |
| 54 DEBUG_ONLY(_deps[end_marker] = NULL); | |
| 55 for (int i = (int)FIRST_TYPE; i < (int)TYPE_LIMIT; i++) { | |
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56 _deps[i] = new(arena) GrowableArray<ciBaseObject*>(arena, 10, 0, 0); |
| 0 | 57 } |
| 58 _content_bytes = NULL; | |
| 59 _size_in_bytes = (size_t)-1; | |
| 60 | |
| 61 assert(TYPE_LIMIT <= (1<<LG2_TYPE_LIMIT), "sanity"); | |
| 62 } | |
| 63 | |
| 64 void Dependencies::assert_evol_method(ciMethod* m) { | |
| 65 assert_common_1(evol_method, m); | |
| 66 } | |
| 67 | |
| 68 void Dependencies::assert_leaf_type(ciKlass* ctxk) { | |
| 69 if (ctxk->is_array_klass()) { | |
| 70 // As a special case, support this assertion on an array type, | |
| 71 // which reduces to an assertion on its element type. | |
| 72 // Note that this cannot be done with assertions that | |
| 73 // relate to concreteness or abstractness. | |
| 74 ciType* elemt = ctxk->as_array_klass()->base_element_type(); | |
| 75 if (!elemt->is_instance_klass()) return; // Ex: int[][] | |
| 76 ctxk = elemt->as_instance_klass(); | |
| 77 //if (ctxk->is_final()) return; // Ex: String[][] | |
| 78 } | |
| 79 check_ctxk(ctxk); | |
| 80 assert_common_1(leaf_type, ctxk); | |
| 81 } | |
| 82 | |
| 83 void Dependencies::assert_abstract_with_unique_concrete_subtype(ciKlass* ctxk, ciKlass* conck) { | |
| 84 check_ctxk_abstract(ctxk); | |
| 85 assert_common_2(abstract_with_unique_concrete_subtype, ctxk, conck); | |
| 86 } | |
| 87 | |
| 88 void Dependencies::assert_abstract_with_no_concrete_subtype(ciKlass* ctxk) { | |
| 89 check_ctxk_abstract(ctxk); | |
| 90 assert_common_1(abstract_with_no_concrete_subtype, ctxk); | |
| 91 } | |
| 92 | |
| 93 void Dependencies::assert_concrete_with_no_concrete_subtype(ciKlass* ctxk) { | |
| 94 check_ctxk_concrete(ctxk); | |
| 95 assert_common_1(concrete_with_no_concrete_subtype, ctxk); | |
| 96 } | |
| 97 | |
| 98 void Dependencies::assert_unique_concrete_method(ciKlass* ctxk, ciMethod* uniqm) { | |
| 99 check_ctxk(ctxk); | |
| 100 assert_common_2(unique_concrete_method, ctxk, uniqm); | |
| 101 } | |
| 102 | |
| 103 void Dependencies::assert_abstract_with_exclusive_concrete_subtypes(ciKlass* ctxk, ciKlass* k1, ciKlass* k2) { | |
| 104 check_ctxk(ctxk); | |
| 105 assert_common_3(abstract_with_exclusive_concrete_subtypes_2, ctxk, k1, k2); | |
| 106 } | |
| 107 | |
| 108 void Dependencies::assert_exclusive_concrete_methods(ciKlass* ctxk, ciMethod* m1, ciMethod* m2) { | |
| 109 check_ctxk(ctxk); | |
| 110 assert_common_3(exclusive_concrete_methods_2, ctxk, m1, m2); | |
| 111 } | |
| 112 | |
| 113 void Dependencies::assert_has_no_finalizable_subclasses(ciKlass* ctxk) { | |
| 114 check_ctxk(ctxk); | |
| 115 assert_common_1(no_finalizable_subclasses, ctxk); | |
| 116 } | |
| 117 | |
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118 void Dependencies::assert_call_site_target_value(ciCallSite* call_site, ciMethodHandle* method_handle) { |
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119 check_ctxk(call_site->klass()); |
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120 assert_common_2(call_site_target_value, call_site, method_handle); |
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121 } |
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122 |
| 0 | 123 // Helper function. If we are adding a new dep. under ctxk2, |
| 124 // try to find an old dep. under a broader* ctxk1. If there is | |
| 125 // | |
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126 bool Dependencies::maybe_merge_ctxk(GrowableArray<ciBaseObject*>* deps, |
| 0 | 127 int ctxk_i, ciKlass* ctxk2) { |
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128 ciKlass* ctxk1 = deps->at(ctxk_i)->as_metadata()->as_klass(); |
| 0 | 129 if (ctxk2->is_subtype_of(ctxk1)) { |
| 130 return true; // success, and no need to change | |
| 131 } else if (ctxk1->is_subtype_of(ctxk2)) { | |
| 132 // new context class fully subsumes previous one | |
| 133 deps->at_put(ctxk_i, ctxk2); | |
| 134 return true; | |
| 135 } else { | |
| 136 return false; | |
| 137 } | |
| 138 } | |
| 139 | |
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140 void Dependencies::assert_common_1(DepType dept, ciBaseObject* x) { |
| 0 | 141 assert(dep_args(dept) == 1, "sanity"); |
| 142 log_dependency(dept, x); | |
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143 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
| 0 | 144 |
| 145 // see if the same (or a similar) dep is already recorded | |
| 146 if (note_dep_seen(dept, x)) { | |
| 147 assert(deps->find(x) >= 0, "sanity"); | |
| 148 } else { | |
| 149 deps->append(x); | |
| 150 } | |
| 151 } | |
| 152 | |
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153 void Dependencies::assert_common_2(DepType dept, |
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154 ciBaseObject* x0, ciBaseObject* x1) { |
| 0 | 155 assert(dep_args(dept) == 2, "sanity"); |
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156 log_dependency(dept, x0, x1); |
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157 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
| 0 | 158 |
| 159 // see if the same (or a similar) dep is already recorded | |
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160 bool has_ctxk = has_explicit_context_arg(dept); |
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161 if (has_ctxk) { |
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162 assert(dep_context_arg(dept) == 0, "sanity"); |
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163 if (note_dep_seen(dept, x1)) { |
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164 // look in this bucket for redundant assertions |
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165 const int stride = 2; |
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166 for (int i = deps->length(); (i -= stride) >= 0; ) { |
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167 ciBaseObject* y1 = deps->at(i+1); |
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168 if (x1 == y1) { // same subject; check the context |
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169 if (maybe_merge_ctxk(deps, i+0, x0->as_metadata()->as_klass())) { |
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170 return; |
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171 } |
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172 } |
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173 } |
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174 } |
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175 } else { |
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176 assert(dep_implicit_context_arg(dept) == 0, "sanity"); |
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177 if (note_dep_seen(dept, x0) && note_dep_seen(dept, x1)) { |
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178 // look in this bucket for redundant assertions |
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179 const int stride = 2; |
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180 for (int i = deps->length(); (i -= stride) >= 0; ) { |
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181 ciBaseObject* y0 = deps->at(i+0); |
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182 ciBaseObject* y1 = deps->at(i+1); |
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183 if (x0 == y0 && x1 == y1) { |
| 0 | 184 return; |
| 185 } | |
| 186 } | |
| 187 } | |
| 188 } | |
| 189 | |
| 190 // append the assertion in the correct bucket: | |
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191 deps->append(x0); |
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192 deps->append(x1); |
| 0 | 193 } |
| 194 | |
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195 void Dependencies::assert_common_3(DepType dept, |
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196 ciKlass* ctxk, ciBaseObject* x, ciBaseObject* x2) { |
| 0 | 197 assert(dep_context_arg(dept) == 0, "sanity"); |
| 198 assert(dep_args(dept) == 3, "sanity"); | |
| 199 log_dependency(dept, ctxk, x, x2); | |
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200 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
| 0 | 201 |
| 202 // try to normalize an unordered pair: | |
| 203 bool swap = false; | |
| 204 switch (dept) { | |
| 205 case abstract_with_exclusive_concrete_subtypes_2: | |
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206 swap = (x->ident() > x2->ident() && x->as_metadata()->as_klass() != ctxk); |
| 0 | 207 break; |
| 208 case exclusive_concrete_methods_2: | |
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209 swap = (x->ident() > x2->ident() && x->as_metadata()->as_method()->holder() != ctxk); |
| 0 | 210 break; |
| 211 } | |
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212 if (swap) { ciBaseObject* t = x; x = x2; x2 = t; } |
| 0 | 213 |
| 214 // see if the same (or a similar) dep is already recorded | |
| 215 if (note_dep_seen(dept, x) && note_dep_seen(dept, x2)) { | |
| 216 // look in this bucket for redundant assertions | |
| 217 const int stride = 3; | |
| 218 for (int i = deps->length(); (i -= stride) >= 0; ) { | |
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219 ciBaseObject* y = deps->at(i+1); |
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220 ciBaseObject* y2 = deps->at(i+2); |
| 0 | 221 if (x == y && x2 == y2) { // same subjects; check the context |
| 222 if (maybe_merge_ctxk(deps, i+0, ctxk)) { | |
| 223 return; | |
| 224 } | |
| 225 } | |
| 226 } | |
| 227 } | |
| 228 // append the assertion in the correct bucket: | |
| 229 deps->append(ctxk); | |
| 230 deps->append(x); | |
| 231 deps->append(x2); | |
| 232 } | |
| 233 | |
| 234 /// Support for encoding dependencies into an nmethod: | |
| 235 | |
| 236 void Dependencies::copy_to(nmethod* nm) { | |
| 237 address beg = nm->dependencies_begin(); | |
| 238 address end = nm->dependencies_end(); | |
| 239 guarantee(end - beg >= (ptrdiff_t) size_in_bytes(), "bad sizing"); | |
| 240 Copy::disjoint_words((HeapWord*) content_bytes(), | |
| 241 (HeapWord*) beg, | |
| 242 size_in_bytes() / sizeof(HeapWord)); | |
| 243 assert(size_in_bytes() % sizeof(HeapWord) == 0, "copy by words"); | |
| 244 } | |
| 245 | |
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246 static int sort_dep(ciBaseObject** p1, ciBaseObject** p2, int narg) { |
| 0 | 247 for (int i = 0; i < narg; i++) { |
| 248 int diff = p1[i]->ident() - p2[i]->ident(); | |
| 249 if (diff != 0) return diff; | |
| 250 } | |
| 251 return 0; | |
| 252 } | |
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253 static int sort_dep_arg_1(ciBaseObject** p1, ciBaseObject** p2) |
| 0 | 254 { return sort_dep(p1, p2, 1); } |
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255 static int sort_dep_arg_2(ciBaseObject** p1, ciBaseObject** p2) |
| 0 | 256 { return sort_dep(p1, p2, 2); } |
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257 static int sort_dep_arg_3(ciBaseObject** p1, ciBaseObject** p2) |
| 0 | 258 { return sort_dep(p1, p2, 3); } |
| 259 | |
| 260 void Dependencies::sort_all_deps() { | |
| 261 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { | |
| 262 DepType dept = (DepType)deptv; | |
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263 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
| 0 | 264 if (deps->length() <= 1) continue; |
| 265 switch (dep_args(dept)) { | |
| 266 case 1: deps->sort(sort_dep_arg_1, 1); break; | |
| 267 case 2: deps->sort(sort_dep_arg_2, 2); break; | |
| 268 case 3: deps->sort(sort_dep_arg_3, 3); break; | |
| 269 default: ShouldNotReachHere(); | |
| 270 } | |
| 271 } | |
| 272 } | |
| 273 | |
| 274 size_t Dependencies::estimate_size_in_bytes() { | |
| 275 size_t est_size = 100; | |
| 276 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { | |
| 277 DepType dept = (DepType)deptv; | |
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278 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
| 0 | 279 est_size += deps->length()*2; // tags and argument(s) |
| 280 } | |
| 281 return est_size; | |
| 282 } | |
| 283 | |
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284 ciKlass* Dependencies::ctxk_encoded_as_null(DepType dept, ciBaseObject* x) { |
| 0 | 285 switch (dept) { |
| 286 case abstract_with_exclusive_concrete_subtypes_2: | |
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287 return x->as_metadata()->as_klass(); |
| 0 | 288 case unique_concrete_method: |
| 289 case exclusive_concrete_methods_2: | |
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290 return x->as_metadata()->as_method()->holder(); |
| 0 | 291 } |
| 292 return NULL; // let NULL be NULL | |
| 293 } | |
| 294 | |
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295 Klass* Dependencies::ctxk_encoded_as_null(DepType dept, Metadata* x) { |
| 0 | 296 assert(must_be_in_vm(), "raw oops here"); |
| 297 switch (dept) { | |
| 298 case abstract_with_exclusive_concrete_subtypes_2: | |
| 299 assert(x->is_klass(), "sanity"); | |
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300 return (Klass*) x; |
| 0 | 301 case unique_concrete_method: |
| 302 case exclusive_concrete_methods_2: | |
| 303 assert(x->is_method(), "sanity"); | |
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304 return ((Method*)x)->method_holder(); |
| 0 | 305 } |
| 306 return NULL; // let NULL be NULL | |
| 307 } | |
| 308 | |
| 309 void Dependencies::encode_content_bytes() { | |
| 310 sort_all_deps(); | |
| 311 | |
| 312 // cast is safe, no deps can overflow INT_MAX | |
| 313 CompressedWriteStream bytes((int)estimate_size_in_bytes()); | |
| 314 | |
| 315 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { | |
| 316 DepType dept = (DepType)deptv; | |
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317 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
| 0 | 318 if (deps->length() == 0) continue; |
| 319 int stride = dep_args(dept); | |
| 320 int ctxkj = dep_context_arg(dept); // -1 if no context arg | |
| 321 assert(stride > 0, "sanity"); | |
| 322 for (int i = 0; i < deps->length(); i += stride) { | |
| 323 jbyte code_byte = (jbyte)dept; | |
| 324 int skipj = -1; | |
| 325 if (ctxkj >= 0 && ctxkj+1 < stride) { | |
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326 ciKlass* ctxk = deps->at(i+ctxkj+0)->as_metadata()->as_klass(); |
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327 ciBaseObject* x = deps->at(i+ctxkj+1); // following argument |
| 0 | 328 if (ctxk == ctxk_encoded_as_null(dept, x)) { |
| 329 skipj = ctxkj; // we win: maybe one less oop to keep track of | |
| 330 code_byte |= default_context_type_bit; | |
| 331 } | |
| 332 } | |
| 333 bytes.write_byte(code_byte); | |
| 334 for (int j = 0; j < stride; j++) { | |
| 335 if (j == skipj) continue; | |
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336 ciBaseObject* v = deps->at(i+j); |
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337 int idx; |
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338 if (v->is_object()) { |
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339 idx = _oop_recorder->find_index(v->as_object()->constant_encoding()); |
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340 } else { |
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341 ciMetadata* meta = v->as_metadata(); |
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342 idx = _oop_recorder->find_index(meta->constant_encoding()); |
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343 } |
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344 bytes.write_int(idx); |
| 0 | 345 } |
| 346 } | |
| 347 } | |
| 348 | |
| 349 // write a sentinel byte to mark the end | |
| 350 bytes.write_byte(end_marker); | |
| 351 | |
| 352 // round it out to a word boundary | |
| 353 while (bytes.position() % sizeof(HeapWord) != 0) { | |
| 354 bytes.write_byte(end_marker); | |
| 355 } | |
| 356 | |
| 357 // check whether the dept byte encoding really works | |
| 358 assert((jbyte)default_context_type_bit != 0, "byte overflow"); | |
| 359 | |
| 360 _content_bytes = bytes.buffer(); | |
| 361 _size_in_bytes = bytes.position(); | |
| 362 } | |
| 363 | |
| 364 | |
| 365 const char* Dependencies::_dep_name[TYPE_LIMIT] = { | |
| 366 "end_marker", | |
| 367 "evol_method", | |
| 368 "leaf_type", | |
| 369 "abstract_with_unique_concrete_subtype", | |
| 370 "abstract_with_no_concrete_subtype", | |
| 371 "concrete_with_no_concrete_subtype", | |
| 372 "unique_concrete_method", | |
| 373 "abstract_with_exclusive_concrete_subtypes_2", | |
| 374 "exclusive_concrete_methods_2", | |
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375 "no_finalizable_subclasses", |
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376 "call_site_target_value" |
| 0 | 377 }; |
| 378 | |
| 379 int Dependencies::_dep_args[TYPE_LIMIT] = { | |
| 380 -1,// end_marker | |
| 381 1, // evol_method m | |
| 382 1, // leaf_type ctxk | |
| 383 2, // abstract_with_unique_concrete_subtype ctxk, k | |
| 384 1, // abstract_with_no_concrete_subtype ctxk | |
| 385 1, // concrete_with_no_concrete_subtype ctxk | |
| 386 2, // unique_concrete_method ctxk, m | |
| 387 3, // unique_concrete_subtypes_2 ctxk, k1, k2 | |
| 388 3, // unique_concrete_methods_2 ctxk, m1, m2 | |
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389 1, // no_finalizable_subclasses ctxk |
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390 2 // call_site_target_value call_site, method_handle |
| 0 | 391 }; |
| 392 | |
| 393 const char* Dependencies::dep_name(Dependencies::DepType dept) { | |
| 394 if (!dept_in_mask(dept, all_types)) return "?bad-dep?"; | |
| 395 return _dep_name[dept]; | |
| 396 } | |
| 397 | |
| 398 int Dependencies::dep_args(Dependencies::DepType dept) { | |
| 399 if (!dept_in_mask(dept, all_types)) return -1; | |
| 400 return _dep_args[dept]; | |
| 401 } | |
| 402 | |
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403 void Dependencies::check_valid_dependency_type(DepType dept) { |
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404 guarantee(FIRST_TYPE <= dept && dept < TYPE_LIMIT, err_msg("invalid dependency type: %d", (int) dept)); |
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405 } |
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406 |
| 0 | 407 // for the sake of the compiler log, print out current dependencies: |
| 408 void Dependencies::log_all_dependencies() { | |
| 409 if (log() == NULL) return; | |
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410 ResourceMark rm; |
| 0 | 411 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { |
| 412 DepType dept = (DepType)deptv; | |
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413 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
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414 int deplen = deps->length(); |
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415 if (deplen == 0) { |
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416 continue; |
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417 } |
| 0 | 418 int stride = dep_args(dept); |
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419 GrowableArray<ciBaseObject*>* ciargs = new GrowableArray<ciBaseObject*>(stride); |
| 0 | 420 for (int i = 0; i < deps->length(); i += stride) { |
| 421 for (int j = 0; j < stride; j++) { | |
| 422 // flush out the identities before printing | |
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423 ciargs->push(deps->at(i+j)); |
| 0 | 424 } |
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425 write_dependency_to(log(), dept, ciargs); |
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426 ciargs->clear(); |
| 0 | 427 } |
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428 guarantee(deplen == deps->length(), "deps array cannot grow inside nested ResoureMark scope"); |
| 0 | 429 } |
| 430 } | |
| 431 | |
| 432 void Dependencies::write_dependency_to(CompileLog* log, | |
| 433 DepType dept, | |
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434 GrowableArray<DepArgument>* args, |
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435 Klass* witness) { |
| 0 | 436 if (log == NULL) { |
| 437 return; | |
| 438 } | |
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439 ResourceMark rm; |
| 0 | 440 ciEnv* env = ciEnv::current(); |
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441 GrowableArray<ciBaseObject*>* ciargs = new GrowableArray<ciBaseObject*>(args->length()); |
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442 for (GrowableArrayIterator<DepArgument> it = args->begin(); it != args->end(); ++it) { |
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443 DepArgument arg = *it; |
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444 if (arg.is_oop()) { |
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445 ciargs->push(env->get_object(arg.oop_value())); |
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446 } else { |
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447 ciargs->push(env->get_metadata(arg.metadata_value())); |
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448 } |
| 0 | 449 } |
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450 int argslen = ciargs->length(); |
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451 Dependencies::write_dependency_to(log, dept, ciargs, witness); |
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452 guarantee(argslen == ciargs->length(), "ciargs array cannot grow inside nested ResoureMark scope"); |
| 0 | 453 } |
| 454 | |
| 455 void Dependencies::write_dependency_to(CompileLog* log, | |
| 456 DepType dept, | |
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457 GrowableArray<ciBaseObject*>* args, |
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458 Klass* witness) { |
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459 if (log == NULL) { |
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460 return; |
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461 } |
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462 ResourceMark rm; |
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463 GrowableArray<int>* argids = new GrowableArray<int>(args->length()); |
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464 for (GrowableArrayIterator<ciBaseObject*> it = args->begin(); it != args->end(); ++it) { |
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465 ciBaseObject* obj = *it; |
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466 if (obj->is_object()) { |
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467 argids->push(log->identify(obj->as_object())); |
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468 } else { |
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469 argids->push(log->identify(obj->as_metadata())); |
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470 } |
| 0 | 471 } |
| 472 if (witness != NULL) { | |
| 473 log->begin_elem("dependency_failed"); | |
| 474 } else { | |
| 475 log->begin_elem("dependency"); | |
| 476 } | |
| 477 log->print(" type='%s'", dep_name(dept)); | |
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478 const int ctxkj = dep_context_arg(dept); // -1 if no context arg |
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479 if (ctxkj >= 0 && ctxkj < argids->length()) { |
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480 log->print(" ctxk='%d'", argids->at(ctxkj)); |
| 0 | 481 } |
| 482 // write remaining arguments, if any. | |
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483 for (int j = 0; j < argids->length(); j++) { |
| 0 | 484 if (j == ctxkj) continue; // already logged |
| 485 if (j == 1) { | |
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486 log->print( " x='%d'", argids->at(j)); |
| 0 | 487 } else { |
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488 log->print(" x%d='%d'", j, argids->at(j)); |
| 0 | 489 } |
| 490 } | |
| 491 if (witness != NULL) { | |
| 492 log->object("witness", witness); | |
| 493 log->stamp(); | |
| 494 } | |
| 495 log->end_elem(); | |
| 496 } | |
| 497 | |
| 498 void Dependencies::write_dependency_to(xmlStream* xtty, | |
| 499 DepType dept, | |
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500 GrowableArray<DepArgument>* args, |
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501 Klass* witness) { |
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502 if (xtty == NULL) { |
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503 return; |
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504 } |
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505 ResourceMark rm; |
| 0 | 506 ttyLocker ttyl; |
| 507 int ctxkj = dep_context_arg(dept); // -1 if no context arg | |
| 508 if (witness != NULL) { | |
| 509 xtty->begin_elem("dependency_failed"); | |
| 510 } else { | |
| 511 xtty->begin_elem("dependency"); | |
| 512 } | |
| 513 xtty->print(" type='%s'", dep_name(dept)); | |
| 514 if (ctxkj >= 0) { | |
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515 xtty->object("ctxk", args->at(ctxkj).metadata_value()); |
| 0 | 516 } |
| 517 // write remaining arguments, if any. | |
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518 for (int j = 0; j < args->length(); j++) { |
| 0 | 519 if (j == ctxkj) continue; // already logged |
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520 DepArgument arg = args->at(j); |
| 0 | 521 if (j == 1) { |
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522 if (arg.is_oop()) { |
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523 xtty->object("x", arg.oop_value()); |
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524 } else { |
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525 xtty->object("x", arg.metadata_value()); |
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526 } |
| 0 | 527 } else { |
| 528 char xn[10]; sprintf(xn, "x%d", j); | |
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529 if (arg.is_oop()) { |
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530 xtty->object(xn, arg.oop_value()); |
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531 } else { |
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532 xtty->object(xn, arg.metadata_value()); |
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533 } |
| 0 | 534 } |
| 535 } | |
| 536 if (witness != NULL) { | |
| 537 xtty->object("witness", witness); | |
| 538 xtty->stamp(); | |
| 539 } | |
| 540 xtty->end_elem(); | |
| 541 } | |
| 542 | |
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543 void Dependencies::print_dependency(DepType dept, GrowableArray<DepArgument>* args, |
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544 Klass* witness) { |
| 0 | 545 ResourceMark rm; |
| 546 ttyLocker ttyl; // keep the following output all in one block | |
| 547 tty->print_cr("%s of type %s", | |
| 548 (witness == NULL)? "Dependency": "Failed dependency", | |
| 549 dep_name(dept)); | |
| 550 // print arguments | |
| 551 int ctxkj = dep_context_arg(dept); // -1 if no context arg | |
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552 for (int j = 0; j < args->length(); j++) { |
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553 DepArgument arg = args->at(j); |
| 0 | 554 bool put_star = false; |
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555 if (arg.is_null()) continue; |
| 0 | 556 const char* what; |
| 557 if (j == ctxkj) { | |
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558 assert(arg.is_metadata(), "must be"); |
| 0 | 559 what = "context"; |
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560 put_star = !Dependencies::is_concrete_klass((Klass*)arg.metadata_value()); |
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561 } else if (arg.is_method()) { |
| 0 | 562 what = "method "; |
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563 put_star = !Dependencies::is_concrete_method((Method*)arg.metadata_value()); |
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564 } else if (arg.is_klass()) { |
| 0 | 565 what = "class "; |
| 566 } else { | |
| 567 what = "object "; | |
| 568 } | |
| 569 tty->print(" %s = %s", what, (put_star? "*": "")); | |
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570 if (arg.is_klass()) |
| 6983 | 571 tty->print("%s", ((Klass*)arg.metadata_value())->external_name()); |
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572 else if (arg.is_method()) |
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573 ((Method*)arg.metadata_value())->print_value(); |
| 0 | 574 else |
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575 ShouldNotReachHere(); // Provide impl for this type. |
| 0 | 576 tty->cr(); |
| 577 } | |
| 578 if (witness != NULL) { | |
| 579 bool put_star = !Dependencies::is_concrete_klass(witness); | |
| 580 tty->print_cr(" witness = %s%s", | |
| 581 (put_star? "*": ""), | |
| 6983 | 582 witness->external_name()); |
| 0 | 583 } |
| 584 } | |
| 585 | |
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586 void Dependencies::DepStream::log_dependency(Klass* witness) { |
| 0 | 587 if (_deps == NULL && xtty == NULL) return; // fast cutout for runtime |
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588 ResourceMark rm; |
|
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589 const int nargs = argument_count(); |
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590 GrowableArray<DepArgument>* args = new GrowableArray<DepArgument>(nargs); |
| 0 | 591 for (int j = 0; j < nargs; j++) { |
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592 if (type() == call_site_target_value) { |
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593 args->push(argument_oop(j)); |
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594 } else { |
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595 args->push(argument(j)); |
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596 } |
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597 } |
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598 int argslen = args->length(); |
| 0 | 599 if (_deps != NULL && _deps->log() != NULL) { |
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600 Dependencies::write_dependency_to(_deps->log(), type(), args, witness); |
| 0 | 601 } else { |
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602 Dependencies::write_dependency_to(xtty, type(), args, witness); |
| 0 | 603 } |
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604 guarantee(argslen == args->length(), "args array cannot grow inside nested ResoureMark scope"); |
| 0 | 605 } |
| 606 | |
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607 void Dependencies::DepStream::print_dependency(Klass* witness, bool verbose) { |
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608 ResourceMark rm; |
| 0 | 609 int nargs = argument_count(); |
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610 GrowableArray<DepArgument>* args = new GrowableArray<DepArgument>(nargs); |
| 0 | 611 for (int j = 0; j < nargs; j++) { |
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612 args->push(argument(j)); |
| 0 | 613 } |
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614 int argslen = args->length(); |
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615 Dependencies::print_dependency(type(), args, witness); |
| 0 | 616 if (verbose) { |
| 617 if (_code != NULL) { | |
| 618 tty->print(" code: "); | |
| 619 _code->print_value_on(tty); | |
| 620 tty->cr(); | |
| 621 } | |
| 622 } | |
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623 guarantee(argslen == args->length(), "args array cannot grow inside nested ResoureMark scope"); |
| 0 | 624 } |
| 625 | |
| 626 | |
| 627 /// Dependency stream support (decodes dependencies from an nmethod): | |
| 628 | |
| 629 #ifdef ASSERT | |
| 630 void Dependencies::DepStream::initial_asserts(size_t byte_limit) { | |
| 631 assert(must_be_in_vm(), "raw oops here"); | |
| 632 _byte_limit = byte_limit; | |
| 633 _type = (DepType)(end_marker-1); // defeat "already at end" assert | |
| 634 assert((_code!=NULL) + (_deps!=NULL) == 1, "one or t'other"); | |
| 635 } | |
| 636 #endif //ASSERT | |
| 637 | |
| 638 bool Dependencies::DepStream::next() { | |
| 639 assert(_type != end_marker, "already at end"); | |
| 640 if (_bytes.position() == 0 && _code != NULL | |
| 641 && _code->dependencies_size() == 0) { | |
| 642 // Method has no dependencies at all. | |
| 643 return false; | |
| 644 } | |
| 645 int code_byte = (_bytes.read_byte() & 0xFF); | |
| 646 if (code_byte == end_marker) { | |
| 647 DEBUG_ONLY(_type = end_marker); | |
| 648 return false; | |
| 649 } else { | |
| 650 int ctxk_bit = (code_byte & Dependencies::default_context_type_bit); | |
| 651 code_byte -= ctxk_bit; | |
| 652 DepType dept = (DepType)code_byte; | |
| 653 _type = dept; | |
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654 Dependencies::check_valid_dependency_type(dept); |
| 0 | 655 int stride = _dep_args[dept]; |
| 656 assert(stride == dep_args(dept), "sanity"); | |
| 657 int skipj = -1; | |
| 658 if (ctxk_bit != 0) { | |
| 659 skipj = 0; // currently the only context argument is at zero | |
| 660 assert(skipj == dep_context_arg(dept), "zero arg always ctxk"); | |
| 661 } | |
| 662 for (int j = 0; j < stride; j++) { | |
| 663 _xi[j] = (j == skipj)? 0: _bytes.read_int(); | |
| 664 } | |
| 665 DEBUG_ONLY(_xi[stride] = -1); // help detect overruns | |
| 666 return true; | |
| 667 } | |
| 668 } | |
| 669 | |
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670 inline Metadata* Dependencies::DepStream::recorded_metadata_at(int i) { |
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671 Metadata* o = NULL; |
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672 if (_code != NULL) { |
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673 o = _code->metadata_at(i); |
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674 } else { |
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675 o = _deps->oop_recorder()->metadata_at(i); |
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676 } |
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677 return o; |
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678 } |
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679 |
| 0 | 680 inline oop Dependencies::DepStream::recorded_oop_at(int i) { |
| 681 return (_code != NULL) | |
| 682 ? _code->oop_at(i) | |
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683 : JNIHandles::resolve(_deps->oop_recorder()->oop_at(i)); |
| 0 | 684 } |
| 685 | |
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686 Metadata* Dependencies::DepStream::argument(int i) { |
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687 Metadata* result = recorded_metadata_at(argument_index(i)); |
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688 |
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689 if (result == NULL) { // Explicit context argument can be compressed |
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690 int ctxkj = dep_context_arg(type()); // -1 if no explicit context arg |
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691 if (ctxkj >= 0 && i == ctxkj && ctxkj+1 < argument_count()) { |
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692 result = ctxk_encoded_as_null(type(), argument(ctxkj+1)); |
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693 } |
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694 } |
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695 |
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696 assert(result == NULL || result->is_klass() || result->is_method(), "must be"); |
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697 return result; |
| 0 | 698 } |
| 699 | |
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700 oop Dependencies::DepStream::argument_oop(int i) { |
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701 oop result = recorded_oop_at(argument_index(i)); |
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702 assert(result == NULL || result->is_oop(), "must be"); |
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703 return result; |
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704 } |
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705 |
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706 Klass* Dependencies::DepStream::context_type() { |
| 0 | 707 assert(must_be_in_vm(), "raw oops here"); |
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708 |
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709 // Most dependencies have an explicit context type argument. |
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710 { |
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711 int ctxkj = dep_context_arg(type()); // -1 if no explicit context arg |
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712 if (ctxkj >= 0) { |
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713 Metadata* k = argument(ctxkj); |
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714 assert(k != NULL && k->is_klass(), "type check"); |
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715 return (Klass*)k; |
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716 } |
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717 } |
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718 |
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719 // Some dependencies are using the klass of the first object |
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720 // argument as implicit context type (e.g. call_site_target_value). |
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721 { |
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722 int ctxkj = dep_implicit_context_arg(type()); |
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723 if (ctxkj >= 0) { |
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724 Klass* k = argument_oop(ctxkj)->klass(); |
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725 assert(k != NULL && k->is_klass(), "type check"); |
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726 return (Klass*) k; |
| 0 | 727 } |
| 728 } | |
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729 |
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730 // And some dependencies don't have a context type at all, |
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731 // e.g. evol_method. |
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732 return NULL; |
| 0 | 733 } |
| 734 | |
| 735 /// Checking dependencies: | |
| 736 | |
| 737 // This hierarchy walker inspects subtypes of a given type, | |
| 738 // trying to find a "bad" class which breaks a dependency. | |
| 739 // Such a class is called a "witness" to the broken dependency. | |
| 740 // While searching around, we ignore "participants", which | |
| 741 // are already known to the dependency. | |
| 742 class ClassHierarchyWalker { | |
| 743 public: | |
| 744 enum { PARTICIPANT_LIMIT = 3 }; | |
| 745 | |
| 746 private: | |
| 747 // optional method descriptor to check for: | |
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748 Symbol* _name; |
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749 Symbol* _signature; |
| 0 | 750 |
| 751 // special classes which are not allowed to be witnesses: | |
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752 Klass* _participants[PARTICIPANT_LIMIT+1]; |
| 0 | 753 int _num_participants; |
| 754 | |
| 755 // cache of method lookups | |
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756 Method* _found_methods[PARTICIPANT_LIMIT+1]; |
| 0 | 757 |
| 758 // if non-zero, tells how many witnesses to convert to participants | |
| 759 int _record_witnesses; | |
| 760 | |
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761 void initialize(Klass* participant) { |
| 0 | 762 _record_witnesses = 0; |
| 763 _participants[0] = participant; | |
| 764 _found_methods[0] = NULL; | |
| 765 _num_participants = 0; | |
| 766 if (participant != NULL) { | |
| 767 // Terminating NULL. | |
| 768 _participants[1] = NULL; | |
| 769 _found_methods[1] = NULL; | |
| 770 _num_participants = 1; | |
| 771 } | |
| 772 } | |
| 773 | |
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774 void initialize_from_method(Method* m) { |
| 0 | 775 assert(m != NULL && m->is_method(), "sanity"); |
| 776 _name = m->name(); | |
| 777 _signature = m->signature(); | |
| 778 } | |
| 779 | |
| 780 public: | |
| 781 // The walker is initialized to recognize certain methods and/or types | |
| 782 // as friendly participants. | |
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783 ClassHierarchyWalker(Klass* participant, Method* m) { |
| 0 | 784 initialize_from_method(m); |
| 785 initialize(participant); | |
| 786 } | |
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787 ClassHierarchyWalker(Method* m) { |
| 0 | 788 initialize_from_method(m); |
| 789 initialize(NULL); | |
| 790 } | |
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791 ClassHierarchyWalker(Klass* participant = NULL) { |
| 0 | 792 _name = NULL; |
| 793 _signature = NULL; | |
| 794 initialize(participant); | |
| 795 } | |
| 796 | |
| 797 // This is common code for two searches: One for concrete subtypes, | |
| 798 // the other for concrete method implementations and overrides. | |
| 799 bool doing_subtype_search() { | |
| 800 return _name == NULL; | |
| 801 } | |
| 802 | |
| 803 int num_participants() { return _num_participants; } | |
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804 Klass* participant(int n) { |
| 0 | 805 assert((uint)n <= (uint)_num_participants, "oob"); |
| 806 return _participants[n]; | |
| 807 } | |
| 808 | |
| 809 // Note: If n==num_participants, returns NULL. | |
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810 Method* found_method(int n) { |
| 0 | 811 assert((uint)n <= (uint)_num_participants, "oob"); |
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812 Method* fm = _found_methods[n]; |
| 0 | 813 assert(n == _num_participants || fm != NULL, "proper usage"); |
| 814 assert(fm == NULL || fm->method_holder() == _participants[n], "sanity"); | |
| 815 return fm; | |
| 816 } | |
| 817 | |
| 818 #ifdef ASSERT | |
| 819 // Assert that m is inherited into ctxk, without intervening overrides. | |
| 820 // (May return true even if this is not true, in corner cases where we punt.) | |
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821 bool check_method_context(Klass* ctxk, Method* m) { |
| 0 | 822 if (m->method_holder() == ctxk) |
| 823 return true; // Quick win. | |
| 824 if (m->is_private()) | |
| 825 return false; // Quick lose. Should not happen. | |
| 826 if (!(m->is_public() || m->is_protected())) | |
| 827 // The override story is complex when packages get involved. | |
| 828 return true; // Must punt the assertion to true. | |
| 6983 | 829 Klass* k = ctxk; |
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830 Method* lm = k->lookup_method(m->name(), m->signature()); |
| 0 | 831 if (lm == NULL && k->oop_is_instance()) { |
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832 // It might be an interface method |
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833 lm = ((InstanceKlass*)k)->lookup_method_in_ordered_interfaces(m->name(), |
| 0 | 834 m->signature()); |
| 835 } | |
| 836 if (lm == m) | |
| 837 // Method m is inherited into ctxk. | |
| 838 return true; | |
| 839 if (lm != NULL) { | |
| 4060 | 840 if (!(lm->is_public() || lm->is_protected())) { |
| 0 | 841 // Method is [package-]private, so the override story is complex. |
| 842 return true; // Must punt the assertion to true. | |
| 4060 | 843 } |
| 844 if (lm->is_static()) { | |
| 845 // Static methods don't override non-static so punt | |
| 846 return true; | |
| 847 } | |
| 0 | 848 if ( !Dependencies::is_concrete_method(lm) |
| 849 && !Dependencies::is_concrete_method(m) | |
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850 && lm->method_holder()->is_subtype_of(m->method_holder())) |
| 0 | 851 // Method m is overridden by lm, but both are non-concrete. |
| 852 return true; | |
| 853 } | |
| 854 ResourceMark rm; | |
| 855 tty->print_cr("Dependency method not found in the associated context:"); | |
| 6983 | 856 tty->print_cr(" context = %s", ctxk->external_name()); |
| 0 | 857 tty->print( " method = "); m->print_short_name(tty); tty->cr(); |
| 858 if (lm != NULL) { | |
| 859 tty->print( " found = "); lm->print_short_name(tty); tty->cr(); | |
| 860 } | |
| 861 return false; | |
| 862 } | |
| 863 #endif | |
| 864 | |
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865 void add_participant(Klass* participant) { |
| 0 | 866 assert(_num_participants + _record_witnesses < PARTICIPANT_LIMIT, "oob"); |
| 867 int np = _num_participants++; | |
| 868 _participants[np] = participant; | |
| 869 _participants[np+1] = NULL; | |
| 870 _found_methods[np+1] = NULL; | |
| 871 } | |
| 872 | |
| 873 void record_witnesses(int add) { | |
| 874 if (add > PARTICIPANT_LIMIT) add = PARTICIPANT_LIMIT; | |
| 875 assert(_num_participants + add < PARTICIPANT_LIMIT, "oob"); | |
| 876 _record_witnesses = add; | |
| 877 } | |
| 878 | |
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879 bool is_witness(Klass* k) { |
| 0 | 880 if (doing_subtype_search()) { |
| 881 return Dependencies::is_concrete_klass(k); | |
|
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882 } else if (!k->oop_is_instance()) { |
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883 return false; // no methods to find in an array type |
| 0 | 884 } else { |
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885 Method* m = InstanceKlass::cast(k)->find_method(_name, _signature); |
| 0 | 886 if (m == NULL || !Dependencies::is_concrete_method(m)) return false; |
| 887 _found_methods[_num_participants] = m; | |
| 888 // Note: If add_participant(k) is called, | |
| 889 // the method m will already be memoized for it. | |
| 890 return true; | |
| 891 } | |
| 892 } | |
| 893 | |
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894 bool is_participant(Klass* k) { |
| 0 | 895 if (k == _participants[0]) { |
| 896 return true; | |
| 897 } else if (_num_participants <= 1) { | |
| 898 return false; | |
| 899 } else { | |
| 900 return in_list(k, &_participants[1]); | |
| 901 } | |
| 902 } | |
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903 bool ignore_witness(Klass* witness) { |
| 0 | 904 if (_record_witnesses == 0) { |
| 905 return false; | |
| 906 } else { | |
| 907 --_record_witnesses; | |
| 908 add_participant(witness); | |
| 909 return true; | |
| 910 } | |
| 911 } | |
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912 static bool in_list(Klass* x, Klass** list) { |
| 0 | 913 for (int i = 0; ; i++) { |
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914 Klass* y = list[i]; |
| 0 | 915 if (y == NULL) break; |
| 916 if (y == x) return true; | |
| 917 } | |
| 918 return false; // not in list | |
| 919 } | |
| 920 | |
| 921 private: | |
| 922 // the actual search method: | |
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923 Klass* find_witness_anywhere(Klass* context_type, |
| 0 | 924 bool participants_hide_witnesses, |
| 925 bool top_level_call = true); | |
| 926 // the spot-checking version: | |
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927 Klass* find_witness_in(KlassDepChange& changes, |
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928 Klass* context_type, |
| 0 | 929 bool participants_hide_witnesses); |
| 930 public: | |
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931 Klass* find_witness_subtype(Klass* context_type, KlassDepChange* changes = NULL) { |
| 0 | 932 assert(doing_subtype_search(), "must set up a subtype search"); |
| 933 // When looking for unexpected concrete types, | |
| 934 // do not look beneath expected ones. | |
| 935 const bool participants_hide_witnesses = true; | |
| 936 // CX > CC > C' is OK, even if C' is new. | |
| 937 // CX > { CC, C' } is not OK if C' is new, and C' is the witness. | |
| 938 if (changes != NULL) { | |
| 939 return find_witness_in(*changes, context_type, participants_hide_witnesses); | |
| 940 } else { | |
| 941 return find_witness_anywhere(context_type, participants_hide_witnesses); | |
| 942 } | |
| 943 } | |
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944 Klass* find_witness_definer(Klass* context_type, KlassDepChange* changes = NULL) { |
| 0 | 945 assert(!doing_subtype_search(), "must set up a method definer search"); |
| 946 // When looking for unexpected concrete methods, | |
| 947 // look beneath expected ones, to see if there are overrides. | |
| 948 const bool participants_hide_witnesses = true; | |
| 949 // CX.m > CC.m > C'.m is not OK, if C'.m is new, and C' is the witness. | |
| 950 if (changes != NULL) { | |
| 951 return find_witness_in(*changes, context_type, !participants_hide_witnesses); | |
| 952 } else { | |
| 953 return find_witness_anywhere(context_type, !participants_hide_witnesses); | |
| 954 } | |
| 955 } | |
| 956 }; | |
| 957 | |
| 958 #ifndef PRODUCT | |
| 959 static int deps_find_witness_calls = 0; | |
| 960 static int deps_find_witness_steps = 0; | |
| 961 static int deps_find_witness_recursions = 0; | |
| 962 static int deps_find_witness_singles = 0; | |
| 963 static int deps_find_witness_print = 0; // set to -1 to force a final print | |
| 964 static bool count_find_witness_calls() { | |
| 965 if (TraceDependencies || LogCompilation) { | |
| 966 int pcount = deps_find_witness_print + 1; | |
| 967 bool final_stats = (pcount == 0); | |
| 968 bool initial_call = (pcount == 1); | |
| 969 bool occasional_print = ((pcount & ((1<<10) - 1)) == 0); | |
| 970 if (pcount < 0) pcount = 1; // crude overflow protection | |
| 971 deps_find_witness_print = pcount; | |
| 972 if (VerifyDependencies && initial_call) { | |
| 973 tty->print_cr("Warning: TraceDependencies results may be inflated by VerifyDependencies"); | |
| 974 } | |
| 975 if (occasional_print || final_stats) { | |
| 976 // Every now and then dump a little info about dependency searching. | |
| 977 if (xtty != NULL) { | |
|
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978 ttyLocker ttyl; |
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979 xtty->elem("deps_find_witness calls='%d' steps='%d' recursions='%d' singles='%d'", |
| 0 | 980 deps_find_witness_calls, |
| 981 deps_find_witness_steps, | |
| 982 deps_find_witness_recursions, | |
| 983 deps_find_witness_singles); | |
| 984 } | |
| 985 if (final_stats || (TraceDependencies && WizardMode)) { | |
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986 ttyLocker ttyl; |
| 0 | 987 tty->print_cr("Dependency check (find_witness) " |
| 988 "calls=%d, steps=%d (avg=%.1f), recursions=%d, singles=%d", | |
| 989 deps_find_witness_calls, | |
| 990 deps_find_witness_steps, | |
| 991 (double)deps_find_witness_steps / deps_find_witness_calls, | |
| 992 deps_find_witness_recursions, | |
| 993 deps_find_witness_singles); | |
| 994 } | |
| 995 } | |
| 996 return true; | |
| 997 } | |
| 998 return false; | |
| 999 } | |
| 1000 #else | |
| 1001 #define count_find_witness_calls() (0) | |
| 1002 #endif //PRODUCT | |
| 1003 | |
| 1004 | |
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1005 Klass* ClassHierarchyWalker::find_witness_in(KlassDepChange& changes, |
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1006 Klass* context_type, |
| 0 | 1007 bool participants_hide_witnesses) { |
| 1008 assert(changes.involves_context(context_type), "irrelevant dependency"); | |
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1009 Klass* new_type = changes.new_type(); |
| 0 | 1010 |
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1011 (void)count_find_witness_calls(); |
| 0 | 1012 NOT_PRODUCT(deps_find_witness_singles++); |
| 1013 | |
| 1014 // Current thread must be in VM (not native mode, as in CI): | |
| 1015 assert(must_be_in_vm(), "raw oops here"); | |
| 1016 // Must not move the class hierarchy during this check: | |
| 1017 assert_locked_or_safepoint(Compile_lock); | |
| 1018 | |
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1019 int nof_impls = InstanceKlass::cast(context_type)->nof_implementors(); |
| 30 | 1020 if (nof_impls > 1) { |
| 1021 // Avoid this case: *I.m > { A.m, C }; B.m > C | |
| 1022 // %%% Until this is fixed more systematically, bail out. | |
| 1023 // See corresponding comment in find_witness_anywhere. | |
| 1024 return context_type; | |
| 1025 } | |
| 1026 | |
| 0 | 1027 assert(!is_participant(new_type), "only old classes are participants"); |
| 1028 if (participants_hide_witnesses) { | |
| 1029 // If the new type is a subtype of a participant, we are done. | |
| 1030 for (int i = 0; i < num_participants(); i++) { | |
|
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1031 Klass* part = participant(i); |
| 0 | 1032 if (part == NULL) continue; |
| 6983 | 1033 assert(changes.involves_context(part) == new_type->is_subtype_of(part), |
| 0 | 1034 "correct marking of participants, b/c new_type is unique"); |
| 1035 if (changes.involves_context(part)) { | |
| 1036 // new guy is protected from this check by previous participant | |
| 1037 return NULL; | |
| 1038 } | |
| 1039 } | |
| 1040 } | |
| 1041 | |
| 1042 if (is_witness(new_type) && | |
| 1043 !ignore_witness(new_type)) { | |
| 1044 return new_type; | |
| 1045 } | |
| 1046 | |
| 1047 return NULL; | |
| 1048 } | |
| 1049 | |
| 1050 | |
| 1051 // Walk hierarchy under a context type, looking for unexpected types. | |
| 1052 // Do not report participant types, and recursively walk beneath | |
| 1053 // them only if participants_hide_witnesses is false. | |
| 1054 // If top_level_call is false, skip testing the context type, | |
| 1055 // because the caller has already considered it. | |
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1056 Klass* ClassHierarchyWalker::find_witness_anywhere(Klass* context_type, |
| 0 | 1057 bool participants_hide_witnesses, |
| 1058 bool top_level_call) { | |
| 1059 // Current thread must be in VM (not native mode, as in CI): | |
| 1060 assert(must_be_in_vm(), "raw oops here"); | |
| 1061 // Must not move the class hierarchy during this check: | |
| 1062 assert_locked_or_safepoint(Compile_lock); | |
| 1063 | |
| 1064 bool do_counts = count_find_witness_calls(); | |
| 1065 | |
| 1066 // Check the root of the sub-hierarchy first. | |
| 1067 if (top_level_call) { | |
| 1068 if (do_counts) { | |
| 1069 NOT_PRODUCT(deps_find_witness_calls++); | |
| 1070 NOT_PRODUCT(deps_find_witness_steps++); | |
| 1071 } | |
| 1072 if (is_participant(context_type)) { | |
| 1073 if (participants_hide_witnesses) return NULL; | |
| 1074 // else fall through to search loop... | |
| 1075 } else if (is_witness(context_type) && !ignore_witness(context_type)) { | |
| 1076 // The context is an abstract class or interface, to start with. | |
| 1077 return context_type; | |
| 1078 } | |
| 1079 } | |
| 1080 | |
| 1081 // Now we must check each implementor and each subclass. | |
| 1082 // Use a short worklist to avoid blowing the stack. | |
| 1083 // Each worklist entry is a *chain* of subklass siblings to process. | |
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1084 const int CHAINMAX = 100; // >= 1 + InstanceKlass::implementors_limit |
| 0 | 1085 Klass* chains[CHAINMAX]; |
| 1086 int chaini = 0; // index into worklist | |
| 1087 Klass* chain; // scratch variable | |
| 1088 #define ADD_SUBCLASS_CHAIN(k) { \ | |
| 1089 assert(chaini < CHAINMAX, "oob"); \ | |
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1090 chain = k->subklass(); \ |
| 0 | 1091 if (chain != NULL) chains[chaini++] = chain; } |
| 1092 | |
| 1093 // Look for non-abstract subclasses. | |
| 1094 // (Note: Interfaces do not have subclasses.) | |
| 1095 ADD_SUBCLASS_CHAIN(context_type); | |
| 1096 | |
| 1097 // If it is an interface, search its direct implementors. | |
| 1098 // (Their subclasses are additional indirect implementors. | |
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1099 // See InstanceKlass::add_implementor.) |
| 0 | 1100 // (Note: nof_implementors is always zero for non-interfaces.) |
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1101 if (top_level_call) { |
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1102 int nof_impls = InstanceKlass::cast(context_type)->nof_implementors(); |
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1103 if (nof_impls > 1) { |
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1104 // Avoid this case: *I.m > { A.m, C }; B.m > C |
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1105 // Here, I.m has 2 concrete implementations, but m appears unique |
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1106 // as A.m, because the search misses B.m when checking C. |
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1107 // The inherited method B.m was getting missed by the walker |
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1108 // when interface 'I' was the starting point. |
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1109 // %%% Until this is fixed more systematically, bail out. |
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1110 // (Old CHA had the same limitation.) |
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1111 return context_type; |
| 0 | 1112 } |
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1113 if (nof_impls > 0) { |
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1114 Klass* impl = InstanceKlass::cast(context_type)->implementor(); |
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1115 assert(impl != NULL, "just checking"); |
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1116 // If impl is the same as the context_type, then more than one |
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1117 // implementor has seen. No exact info in this case. |
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1118 if (impl == context_type) { |
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1119 return context_type; // report an inexact witness to this sad affair |
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1120 } |
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1121 if (do_counts) |
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1122 { NOT_PRODUCT(deps_find_witness_steps++); } |
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1123 if (is_participant(impl)) { |
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1124 if (!participants_hide_witnesses) { |
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1125 ADD_SUBCLASS_CHAIN(impl); |
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1126 } |
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1127 } else if (is_witness(impl) && !ignore_witness(impl)) { |
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1128 return impl; |
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1129 } else { |
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1130 ADD_SUBCLASS_CHAIN(impl); |
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1131 } |
| 0 | 1132 } |
| 1133 } | |
| 1134 | |
| 1135 // Recursively process each non-trivial sibling chain. | |
| 1136 while (chaini > 0) { | |
| 1137 Klass* chain = chains[--chaini]; | |
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1138 for (Klass* sub = chain; sub != NULL; sub = sub->next_sibling()) { |
| 0 | 1139 if (do_counts) { NOT_PRODUCT(deps_find_witness_steps++); } |
| 1140 if (is_participant(sub)) { | |
| 1141 if (participants_hide_witnesses) continue; | |
| 1142 // else fall through to process this guy's subclasses | |
| 1143 } else if (is_witness(sub) && !ignore_witness(sub)) { | |
| 1144 return sub; | |
| 1145 } | |
| 1146 if (chaini < (VerifyDependencies? 2: CHAINMAX)) { | |
| 1147 // Fast path. (Partially disabled if VerifyDependencies.) | |
| 1148 ADD_SUBCLASS_CHAIN(sub); | |
| 1149 } else { | |
| 1150 // Worklist overflow. Do a recursive call. Should be rare. | |
| 1151 // The recursive call will have its own worklist, of course. | |
| 1152 // (Note that sub has already been tested, so that there is | |
| 1153 // no need for the recursive call to re-test. That's handy, | |
| 1154 // since the recursive call sees sub as the context_type.) | |
| 1155 if (do_counts) { NOT_PRODUCT(deps_find_witness_recursions++); } | |
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1156 Klass* witness = find_witness_anywhere(sub, |
| 0 | 1157 participants_hide_witnesses, |
| 1158 /*top_level_call=*/ false); | |
| 1159 if (witness != NULL) return witness; | |
| 1160 } | |
| 1161 } | |
| 1162 } | |
| 1163 | |
| 1164 // No witness found. The dependency remains unbroken. | |
| 1165 return NULL; | |
| 1166 #undef ADD_SUBCLASS_CHAIN | |
| 1167 } | |
| 1168 | |
| 1169 | |
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1170 bool Dependencies::is_concrete_klass(Klass* k) { |
| 6983 | 1171 if (k->is_abstract()) return false; |
| 0 | 1172 // %%% We could treat classes which are concrete but |
| 1173 // have not yet been instantiated as virtually abstract. | |
| 1174 // This would require a deoptimization barrier on first instantiation. | |
| 1175 //if (k->is_not_instantiated()) return false; | |
| 1176 return true; | |
| 1177 } | |
| 1178 | |
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1179 bool Dependencies::is_concrete_method(Method* m) { |
| 4060 | 1180 // Statics are irrelevant to virtual call sites. |
| 1181 if (m->is_static()) return false; | |
| 1182 | |
| 1183 // We could also return false if m does not yet appear to be | |
| 1184 // executed, if the VM version supports this distinction also. | |
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1185 // Default methods are considered "concrete" as well. |
| 6934 | 1186 return !m->is_abstract() && |
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1187 !m->is_overpass(); // error functions aren't concrete |
| 0 | 1188 } |
| 1189 | |
| 1190 | |
| 1191 Klass* Dependencies::find_finalizable_subclass(Klass* k) { | |
| 1192 if (k->is_interface()) return NULL; | |
| 1193 if (k->has_finalizer()) return k; | |
| 1194 k = k->subklass(); | |
| 1195 while (k != NULL) { | |
| 1196 Klass* result = find_finalizable_subclass(k); | |
| 1197 if (result != NULL) return result; | |
| 1198 k = k->next_sibling(); | |
| 1199 } | |
| 1200 return NULL; | |
| 1201 } | |
| 1202 | |
| 1203 | |
| 1204 bool Dependencies::is_concrete_klass(ciInstanceKlass* k) { | |
| 1205 if (k->is_abstract()) return false; | |
| 4060 | 1206 // We could also return false if k does not yet appear to be |
| 0 | 1207 // instantiated, if the VM version supports this distinction also. |
| 1208 //if (k->is_not_instantiated()) return false; | |
| 1209 return true; | |
| 1210 } | |
| 1211 | |
| 1212 bool Dependencies::is_concrete_method(ciMethod* m) { | |
| 1213 // Statics are irrelevant to virtual call sites. | |
| 1214 if (m->is_static()) return false; | |
| 1215 | |
| 4060 | 1216 // We could also return false if m does not yet appear to be |
| 0 | 1217 // executed, if the VM version supports this distinction also. |
| 1218 return !m->is_abstract(); | |
| 1219 } | |
| 1220 | |
| 1221 | |
| 1222 bool Dependencies::has_finalizable_subclass(ciInstanceKlass* k) { | |
| 1223 return k->has_finalizable_subclass(); | |
| 1224 } | |
| 1225 | |
| 1226 | |
| 1227 // Any use of the contents (bytecodes) of a method must be | |
| 1228 // marked by an "evol_method" dependency, if those contents | |
| 1229 // can change. (Note: A method is always dependent on itself.) | |
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1230 Klass* Dependencies::check_evol_method(Method* m) { |
| 0 | 1231 assert(must_be_in_vm(), "raw oops here"); |
| 1232 // Did somebody do a JVMTI RedefineClasses while our backs were turned? | |
| 1233 // Or is there a now a breakpoint? | |
| 1234 // (Assumes compiled code cannot handle bkpts; change if UseFastBreakpoints.) | |
| 1235 if (m->is_old() | |
| 1236 || m->number_of_breakpoints() > 0) { | |
| 1237 return m->method_holder(); | |
| 1238 } else { | |
| 1239 return NULL; | |
| 1240 } | |
| 1241 } | |
| 1242 | |
| 1243 // This is a strong assertion: It is that the given type | |
| 1244 // has no subtypes whatever. It is most useful for | |
| 1245 // optimizing checks on reflected types or on array types. | |
| 1246 // (Checks on types which are derived from real instances | |
| 1247 // can be optimized more strongly than this, because we | |
| 1248 // know that the checked type comes from a concrete type, | |
| 1249 // and therefore we can disregard abstract types.) | |
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1250 Klass* Dependencies::check_leaf_type(Klass* ctxk) { |
| 0 | 1251 assert(must_be_in_vm(), "raw oops here"); |
| 1252 assert_locked_or_safepoint(Compile_lock); | |
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1253 InstanceKlass* ctx = InstanceKlass::cast(ctxk); |
| 0 | 1254 Klass* sub = ctx->subklass(); |
| 1255 if (sub != NULL) { | |
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1256 return sub; |
| 0 | 1257 } else if (ctx->nof_implementors() != 0) { |
| 1258 // if it is an interface, it must be unimplemented | |
| 1259 // (if it is not an interface, nof_implementors is always zero) | |
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1260 Klass* impl = ctx->implementor(); |
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1261 assert(impl != NULL, "must be set"); |
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1262 return impl; |
| 0 | 1263 } else { |
| 1264 return NULL; | |
| 1265 } | |
| 1266 } | |
| 1267 | |
| 1268 // Test the assertion that conck is the only concrete subtype* of ctxk. | |
| 1269 // The type conck itself is allowed to have have further concrete subtypes. | |
| 1270 // This allows the compiler to narrow occurrences of ctxk by conck, | |
| 1271 // when dealing with the types of actual instances. | |
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1272 Klass* Dependencies::check_abstract_with_unique_concrete_subtype(Klass* ctxk, |
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1273 Klass* conck, |
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1274 KlassDepChange* changes) { |
| 0 | 1275 ClassHierarchyWalker wf(conck); |
| 1276 return wf.find_witness_subtype(ctxk, changes); | |
| 1277 } | |
| 1278 | |
| 1279 // If a non-concrete class has no concrete subtypes, it is not (yet) | |
| 1280 // instantiatable. This can allow the compiler to make some paths go | |
| 1281 // dead, if they are gated by a test of the type. | |
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1282 Klass* Dependencies::check_abstract_with_no_concrete_subtype(Klass* ctxk, |
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1283 KlassDepChange* changes) { |
| 0 | 1284 // Find any concrete subtype, with no participants: |
| 1285 ClassHierarchyWalker wf; | |
| 1286 return wf.find_witness_subtype(ctxk, changes); | |
| 1287 } | |
| 1288 | |
| 1289 | |
| 1290 // If a concrete class has no concrete subtypes, it can always be | |
| 1291 // exactly typed. This allows the use of a cheaper type test. | |
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1292 Klass* Dependencies::check_concrete_with_no_concrete_subtype(Klass* ctxk, |
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1293 KlassDepChange* changes) { |
| 0 | 1294 // Find any concrete subtype, with only the ctxk as participant: |
| 1295 ClassHierarchyWalker wf(ctxk); | |
| 1296 return wf.find_witness_subtype(ctxk, changes); | |
| 1297 } | |
| 1298 | |
| 1299 | |
| 1300 // Find the unique concrete proper subtype of ctxk, or NULL if there | |
| 1301 // is more than one concrete proper subtype. If there are no concrete | |
| 1302 // proper subtypes, return ctxk itself, whether it is concrete or not. | |
| 1303 // The returned subtype is allowed to have have further concrete subtypes. | |
| 1304 // That is, return CC1 for CX > CC1 > CC2, but NULL for CX > { CC1, CC2 }. | |
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1305 Klass* Dependencies::find_unique_concrete_subtype(Klass* ctxk) { |
| 0 | 1306 ClassHierarchyWalker wf(ctxk); // Ignore ctxk when walking. |
| 1307 wf.record_witnesses(1); // Record one other witness when walking. | |
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1308 Klass* wit = wf.find_witness_subtype(ctxk); |
| 0 | 1309 if (wit != NULL) return NULL; // Too many witnesses. |
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1310 Klass* conck = wf.participant(0); |
| 0 | 1311 if (conck == NULL) { |
| 1312 #ifndef PRODUCT | |
| 1313 // Make sure the dependency mechanism will pass this discovery: | |
| 1314 if (VerifyDependencies) { | |
| 1315 // Turn off dependency tracing while actually testing deps. | |
| 1316 FlagSetting fs(TraceDependencies, false); | |
| 1317 if (!Dependencies::is_concrete_klass(ctxk)) { | |
| 1318 guarantee(NULL == | |
| 1319 (void *)check_abstract_with_no_concrete_subtype(ctxk), | |
| 1320 "verify dep."); | |
| 1321 } else { | |
| 1322 guarantee(NULL == | |
| 1323 (void *)check_concrete_with_no_concrete_subtype(ctxk), | |
| 1324 "verify dep."); | |
| 1325 } | |
| 1326 } | |
| 1327 #endif //PRODUCT | |
| 1328 return ctxk; // Return ctxk as a flag for "no subtypes". | |
| 1329 } else { | |
| 1330 #ifndef PRODUCT | |
| 1331 // Make sure the dependency mechanism will pass this discovery: | |
| 1332 if (VerifyDependencies) { | |
| 1333 // Turn off dependency tracing while actually testing deps. | |
| 1334 FlagSetting fs(TraceDependencies, false); | |
| 1335 if (!Dependencies::is_concrete_klass(ctxk)) { | |
| 1336 guarantee(NULL == (void *) | |
| 1337 check_abstract_with_unique_concrete_subtype(ctxk, conck), | |
| 1338 "verify dep."); | |
| 1339 } | |
| 1340 } | |
| 1341 #endif //PRODUCT | |
| 1342 return conck; | |
| 1343 } | |
| 1344 } | |
| 1345 | |
| 1346 // Test the assertion that the k[12] are the only concrete subtypes of ctxk, | |
| 1347 // except possibly for further subtypes of k[12] themselves. | |
| 1348 // The context type must be abstract. The types k1 and k2 are themselves | |
| 1349 // allowed to have further concrete subtypes. | |
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1350 Klass* Dependencies::check_abstract_with_exclusive_concrete_subtypes( |
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1351 Klass* ctxk, |
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1352 Klass* k1, |
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1353 Klass* k2, |
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1354 KlassDepChange* changes) { |
| 0 | 1355 ClassHierarchyWalker wf; |
| 1356 wf.add_participant(k1); | |
| 1357 wf.add_participant(k2); | |
| 1358 return wf.find_witness_subtype(ctxk, changes); | |
| 1359 } | |
| 1360 | |
| 1361 // Search ctxk for concrete implementations. If there are klen or fewer, | |
| 1362 // pack them into the given array and return the number. | |
| 1363 // Otherwise, return -1, meaning the given array would overflow. | |
| 1364 // (Note that a return of 0 means there are exactly no concrete subtypes.) | |
| 1365 // In this search, if ctxk is concrete, it will be reported alone. | |
| 1366 // For any type CC reported, no proper subtypes of CC will be reported. | |
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1367 int Dependencies::find_exclusive_concrete_subtypes(Klass* ctxk, |
| 0 | 1368 int klen, |
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1369 Klass* karray[]) { |
| 0 | 1370 ClassHierarchyWalker wf; |
| 1371 wf.record_witnesses(klen); | |
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1372 Klass* wit = wf.find_witness_subtype(ctxk); |
| 0 | 1373 if (wit != NULL) return -1; // Too many witnesses. |
| 1374 int num = wf.num_participants(); | |
| 1375 assert(num <= klen, "oob"); | |
| 1376 // Pack the result array with the good news. | |
| 1377 for (int i = 0; i < num; i++) | |
| 1378 karray[i] = wf.participant(i); | |
| 1379 #ifndef PRODUCT | |
| 1380 // Make sure the dependency mechanism will pass this discovery: | |
| 1381 if (VerifyDependencies) { | |
| 1382 // Turn off dependency tracing while actually testing deps. | |
| 1383 FlagSetting fs(TraceDependencies, false); | |
| 1384 switch (Dependencies::is_concrete_klass(ctxk)? -1: num) { | |
| 1385 case -1: // ctxk was itself concrete | |
| 1386 guarantee(num == 1 && karray[0] == ctxk, "verify dep."); | |
| 1387 break; | |
| 1388 case 0: | |
| 1389 guarantee(NULL == (void *)check_abstract_with_no_concrete_subtype(ctxk), | |
| 1390 "verify dep."); | |
| 1391 break; | |
| 1392 case 1: | |
| 1393 guarantee(NULL == (void *) | |
| 1394 check_abstract_with_unique_concrete_subtype(ctxk, karray[0]), | |
| 1395 "verify dep."); | |
| 1396 break; | |
| 1397 case 2: | |
| 1398 guarantee(NULL == (void *) | |
| 1399 check_abstract_with_exclusive_concrete_subtypes(ctxk, | |
| 1400 karray[0], | |
| 1401 karray[1]), | |
| 1402 "verify dep."); | |
| 1403 break; | |
| 1404 default: | |
| 1405 ShouldNotReachHere(); // klen > 2 yet supported | |
| 1406 } | |
| 1407 } | |
| 1408 #endif //PRODUCT | |
| 1409 return num; | |
| 1410 } | |
| 1411 | |
| 1412 // If a class (or interface) has a unique concrete method uniqm, return NULL. | |
| 1413 // Otherwise, return a class that contains an interfering method. | |
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1414 Klass* Dependencies::check_unique_concrete_method(Klass* ctxk, Method* uniqm, |
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1415 KlassDepChange* changes) { |
| 0 | 1416 // Here is a missing optimization: If uniqm->is_final(), |
| 1417 // we don't really need to search beneath it for overrides. | |
| 1418 // This is probably not important, since we don't use dependencies | |
| 1419 // to track final methods. (They can't be "definalized".) | |
| 1420 ClassHierarchyWalker wf(uniqm->method_holder(), uniqm); | |
| 1421 return wf.find_witness_definer(ctxk, changes); | |
| 1422 } | |
| 1423 | |
| 1424 // Find the set of all non-abstract methods under ctxk that match m. | |
| 1425 // (The method m must be defined or inherited in ctxk.) | |
| 1426 // Include m itself in the set, unless it is abstract. | |
| 1427 // If this set has exactly one element, return that element. | |
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1428 Method* Dependencies::find_unique_concrete_method(Klass* ctxk, Method* m) { |
| 0 | 1429 ClassHierarchyWalker wf(m); |
| 1430 assert(wf.check_method_context(ctxk, m), "proper context"); | |
| 1431 wf.record_witnesses(1); | |
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1432 Klass* wit = wf.find_witness_definer(ctxk); |
| 0 | 1433 if (wit != NULL) return NULL; // Too many witnesses. |
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1434 Method* fm = wf.found_method(0); // Will be NULL if num_parts == 0. |
| 0 | 1435 if (Dependencies::is_concrete_method(m)) { |
| 1436 if (fm == NULL) { | |
| 1437 // It turns out that m was always the only implementation. | |
| 1438 fm = m; | |
| 1439 } else if (fm != m) { | |
| 1440 // Two conflicting implementations after all. | |
| 1441 // (This can happen if m is inherited into ctxk and fm overrides it.) | |
| 1442 return NULL; | |
| 1443 } | |
| 1444 } | |
| 1445 #ifndef PRODUCT | |
| 1446 // Make sure the dependency mechanism will pass this discovery: | |
| 1447 if (VerifyDependencies && fm != NULL) { | |
| 1448 guarantee(NULL == (void *)check_unique_concrete_method(ctxk, fm), | |
| 1449 "verify dep."); | |
| 1450 } | |
| 1451 #endif //PRODUCT | |
| 1452 return fm; | |
| 1453 } | |
| 1454 | |
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1455 Klass* Dependencies::check_exclusive_concrete_methods(Klass* ctxk, |
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1456 Method* m1, |
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1457 Method* m2, |
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1458 KlassDepChange* changes) { |
| 0 | 1459 ClassHierarchyWalker wf(m1); |
| 1460 wf.add_participant(m1->method_holder()); | |
| 1461 wf.add_participant(m2->method_holder()); | |
| 1462 return wf.find_witness_definer(ctxk, changes); | |
| 1463 } | |
| 1464 | |
| 1465 // Find the set of all non-abstract methods under ctxk that match m[0]. | |
| 1466 // (The method m[0] must be defined or inherited in ctxk.) | |
| 1467 // Include m itself in the set, unless it is abstract. | |
| 1468 // Fill the given array m[0..(mlen-1)] with this set, and return the length. | |
| 1469 // (The length may be zero if no concrete methods are found anywhere.) | |
| 1470 // If there are too many concrete methods to fit in marray, return -1. | |
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1471 int Dependencies::find_exclusive_concrete_methods(Klass* ctxk, |
| 0 | 1472 int mlen, |
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1473 Method* marray[]) { |
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1474 Method* m0 = marray[0]; |
| 0 | 1475 ClassHierarchyWalker wf(m0); |
| 1476 assert(wf.check_method_context(ctxk, m0), "proper context"); | |
| 1477 wf.record_witnesses(mlen); | |
| 1478 bool participants_hide_witnesses = true; | |
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1479 Klass* wit = wf.find_witness_definer(ctxk); |
| 0 | 1480 if (wit != NULL) return -1; // Too many witnesses. |
| 1481 int num = wf.num_participants(); | |
| 1482 assert(num <= mlen, "oob"); | |
| 1483 // Keep track of whether m is also part of the result set. | |
| 1484 int mfill = 0; | |
| 1485 assert(marray[mfill] == m0, "sanity"); | |
| 1486 if (Dependencies::is_concrete_method(m0)) | |
| 1487 mfill++; // keep m0 as marray[0], the first result | |
| 1488 for (int i = 0; i < num; i++) { | |
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1489 Method* fm = wf.found_method(i); |
| 0 | 1490 if (fm == m0) continue; // Already put this guy in the list. |
| 1491 if (mfill == mlen) { | |
| 1492 return -1; // Oops. Too many methods after all! | |
| 1493 } | |
| 1494 marray[mfill++] = fm; | |
| 1495 } | |
| 1496 #ifndef PRODUCT | |
| 1497 // Make sure the dependency mechanism will pass this discovery: | |
| 1498 if (VerifyDependencies) { | |
| 1499 // Turn off dependency tracing while actually testing deps. | |
| 1500 FlagSetting fs(TraceDependencies, false); | |
| 1501 switch (mfill) { | |
| 1502 case 1: | |
| 1503 guarantee(NULL == (void *)check_unique_concrete_method(ctxk, marray[0]), | |
| 1504 "verify dep."); | |
| 1505 break; | |
| 1506 case 2: | |
| 1507 guarantee(NULL == (void *) | |
| 1508 check_exclusive_concrete_methods(ctxk, marray[0], marray[1]), | |
| 1509 "verify dep."); | |
| 1510 break; | |
| 1511 default: | |
| 1512 ShouldNotReachHere(); // mlen > 2 yet supported | |
| 1513 } | |
| 1514 } | |
| 1515 #endif //PRODUCT | |
| 1516 return mfill; | |
| 1517 } | |
| 1518 | |
| 1519 | |
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1520 Klass* Dependencies::check_has_no_finalizable_subclasses(Klass* ctxk, KlassDepChange* changes) { |
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1521 Klass* search_at = ctxk; |
| 0 | 1522 if (changes != NULL) |
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1523 search_at = changes->new_type(); // just look at the new bit |
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1524 return find_finalizable_subclass(search_at); |
| 0 | 1525 } |
| 1526 | |
| 1527 | |
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1528 Klass* Dependencies::check_call_site_target_value(oop call_site, oop method_handle, CallSiteDepChange* changes) { |
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1529 assert(call_site ->is_a(SystemDictionary::CallSite_klass()), "sanity"); |
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1530 assert(method_handle->is_a(SystemDictionary::MethodHandle_klass()), "sanity"); |
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1531 if (changes == NULL) { |
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1532 // Validate all CallSites |
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1533 if (java_lang_invoke_CallSite::target(call_site) != method_handle) |
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1534 return call_site->klass(); // assertion failed |
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1535 } else { |
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1536 // Validate the given CallSite |
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1537 if (call_site == changes->call_site() && java_lang_invoke_CallSite::target(call_site) != changes->method_handle()) { |
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1538 assert(method_handle != changes->method_handle(), "must be"); |
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1539 return call_site->klass(); // assertion failed |
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1540 } |
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1541 } |
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1542 return NULL; // assertion still valid |
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1543 } |
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1544 |
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1545 |
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1546 void Dependencies::DepStream::trace_and_log_witness(Klass* witness) { |
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1547 if (witness != NULL) { |
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1548 if (TraceDependencies) { |
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1549 print_dependency(witness, /*verbose=*/ true); |
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1550 } |
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1551 // The following is a no-op unless logging is enabled: |
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1552 log_dependency(witness); |
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1553 } |
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1554 } |
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1555 |
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1556 |
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1557 Klass* Dependencies::DepStream::check_klass_dependency(KlassDepChange* changes) { |
| 0 | 1558 assert_locked_or_safepoint(Compile_lock); |
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1559 Dependencies::check_valid_dependency_type(type()); |
| 0 | 1560 |
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1561 Klass* witness = NULL; |
| 0 | 1562 switch (type()) { |
| 1563 case evol_method: | |
| 1564 witness = check_evol_method(method_argument(0)); | |
| 1565 break; | |
| 1566 case leaf_type: | |
| 1567 witness = check_leaf_type(context_type()); | |
| 1568 break; | |
| 1569 case abstract_with_unique_concrete_subtype: | |
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1570 witness = check_abstract_with_unique_concrete_subtype(context_type(), type_argument(1), changes); |
| 0 | 1571 break; |
| 1572 case abstract_with_no_concrete_subtype: | |
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1573 witness = check_abstract_with_no_concrete_subtype(context_type(), changes); |
| 0 | 1574 break; |
| 1575 case concrete_with_no_concrete_subtype: | |
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1576 witness = check_concrete_with_no_concrete_subtype(context_type(), changes); |
| 0 | 1577 break; |
| 1578 case unique_concrete_method: | |
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1579 witness = check_unique_concrete_method(context_type(), method_argument(1), changes); |
| 0 | 1580 break; |
| 1581 case abstract_with_exclusive_concrete_subtypes_2: | |
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1582 witness = check_abstract_with_exclusive_concrete_subtypes(context_type(), type_argument(1), type_argument(2), changes); |
| 0 | 1583 break; |
| 1584 case exclusive_concrete_methods_2: | |
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1585 witness = check_exclusive_concrete_methods(context_type(), method_argument(1), method_argument(2), changes); |
| 0 | 1586 break; |
| 1587 case no_finalizable_subclasses: | |
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1588 witness = check_has_no_finalizable_subclasses(context_type(), changes); |
| 0 | 1589 break; |
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1590 default: |
| 0 | 1591 witness = NULL; |
| 1592 break; | |
| 1593 } | |
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1594 trace_and_log_witness(witness); |
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1595 return witness; |
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1596 } |
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1597 |
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1598 |
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1599 Klass* Dependencies::DepStream::check_call_site_dependency(CallSiteDepChange* changes) { |
|
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1600 assert_locked_or_safepoint(Compile_lock); |
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1601 Dependencies::check_valid_dependency_type(type()); |
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1602 |
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1603 Klass* witness = NULL; |
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1604 switch (type()) { |
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1605 case call_site_target_value: |
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1606 witness = check_call_site_target_value(argument_oop(0), argument_oop(1), changes); |
|
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1607 break; |
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1608 default: |
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1609 witness = NULL; |
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1610 break; |
| 0 | 1611 } |
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1612 trace_and_log_witness(witness); |
| 0 | 1613 return witness; |
| 1614 } | |
| 1615 | |
| 1616 | |
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1617 Klass* Dependencies::DepStream::spot_check_dependency_at(DepChange& changes) { |
|
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1618 // Handle klass dependency |
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1619 if (changes.is_klass_change() && changes.as_klass_change()->involves_context(context_type())) |
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1620 return check_klass_dependency(changes.as_klass_change()); |
| 0 | 1621 |
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1622 // Handle CallSite dependency |
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1623 if (changes.is_call_site_change()) |
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1624 return check_call_site_dependency(changes.as_call_site_change()); |
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1625 |
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1626 // irrelevant dependency; skip it |
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1627 return NULL; |
| 0 | 1628 } |
| 1629 | |
| 1630 | |
|
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1631 void DepChange::print() { |
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1632 int nsup = 0, nint = 0; |
| 0 | 1633 for (ContextStream str(*this); str.next(); ) { |
|
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1634 Klass* k = str.klass(); |
|
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1635 switch (str.change_type()) { |
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1636 case Change_new_type: |
|
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1637 tty->print_cr(" dependee = %s", InstanceKlass::cast(k)->external_name()); |
|
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1638 break; |
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1639 case Change_new_sub: |
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1640 if (!WizardMode) { |
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1641 ++nsup; |
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1642 } else { |
|
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1643 tty->print_cr(" context super = %s", InstanceKlass::cast(k)->external_name()); |
|
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1644 } |
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1645 break; |
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1646 case Change_new_impl: |
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1647 if (!WizardMode) { |
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1648 ++nint; |
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1649 } else { |
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1650 tty->print_cr(" context interface = %s", InstanceKlass::cast(k)->external_name()); |
|
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1651 } |
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1652 break; |
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1653 } |
|
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1654 } |
|
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1655 if (nsup + nint != 0) { |
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1656 tty->print_cr(" context supers = %d, interfaces = %d", nsup, nint); |
| 0 | 1657 } |
| 1658 } | |
| 1659 | |
|
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1660 void DepChange::ContextStream::start() { |
|
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1661 Klass* new_type = _changes.is_klass_change() ? _changes.as_klass_change()->new_type() : (Klass*) NULL; |
|
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1662 _change_type = (new_type == NULL ? NO_CHANGE : Start_Klass); |
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1663 _klass = new_type; |
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1664 _ti_base = NULL; |
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1665 _ti_index = 0; |
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1666 _ti_limit = 0; |
| 0 | 1667 } |
| 1668 | |
| 1669 bool DepChange::ContextStream::next() { | |
| 1670 switch (_change_type) { | |
| 1671 case Start_Klass: // initial state; _klass is the new type | |
|
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1672 _ti_base = InstanceKlass::cast(_klass)->transitive_interfaces(); |
| 0 | 1673 _ti_index = 0; |
| 1674 _change_type = Change_new_type; | |
| 1675 return true; | |
| 1676 case Change_new_type: | |
| 1677 // fall through: | |
| 1678 _change_type = Change_new_sub; | |
| 1679 case Change_new_sub: | |
|
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1680 // 6598190: brackets workaround Sun Studio C++ compiler bug 6629277 |
|
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1681 { |
|
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1682 _klass = InstanceKlass::cast(_klass)->super(); |
|
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1683 if (_klass != NULL) { |
|
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1684 return true; |
|
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|
1685 } |
| 0 | 1686 } |
| 1687 // else set up _ti_limit and fall through: | |
| 1688 _ti_limit = (_ti_base == NULL) ? 0 : _ti_base->length(); | |
| 1689 _change_type = Change_new_impl; | |
| 1690 case Change_new_impl: | |
| 1691 if (_ti_index < _ti_limit) { | |
|
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1692 _klass = _ti_base->at(_ti_index++); |
| 0 | 1693 return true; |
| 1694 } | |
| 1695 // fall through: | |
| 1696 _change_type = NO_CHANGE; // iterator is exhausted | |
| 1697 case NO_CHANGE: | |
| 1698 break; | |
| 1699 default: | |
| 1700 ShouldNotReachHere(); | |
| 1701 } | |
| 1702 return false; | |
| 1703 } | |
| 1704 | |
|
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1705 void KlassDepChange::initialize() { |
|
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1706 // entire transaction must be under this lock: |
|
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1707 assert_lock_strong(Compile_lock); |
|
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1708 |
|
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1709 // Mark all dependee and all its superclasses |
|
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1710 // Mark transitive interfaces |
| 0 | 1711 for (ContextStream str(*this); str.next(); ) { |
|
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1712 Klass* d = str.klass(); |
|
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1713 assert(!InstanceKlass::cast(d)->is_marked_dependent(), "checking"); |
|
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1714 InstanceKlass::cast(d)->set_is_marked_dependent(true); |
| 0 | 1715 } |
|
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1716 } |
|
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1717 |
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1718 KlassDepChange::~KlassDepChange() { |
|
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1719 // Unmark all dependee and all its superclasses |
|
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1720 // Unmark transitive interfaces |
|
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1721 for (ContextStream str(*this); str.next(); ) { |
|
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1722 Klass* d = str.klass(); |
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1723 InstanceKlass::cast(d)->set_is_marked_dependent(false); |
| 0 | 1724 } |
| 1725 } | |
| 1726 | |
|
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1727 bool KlassDepChange::involves_context(Klass* k) { |
| 6983 | 1728 if (k == NULL || !k->oop_is_instance()) { |
|
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1729 return false; |
|
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|
1730 } |
|
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1731 InstanceKlass* ik = InstanceKlass::cast(k); |
|
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1732 bool is_contained = ik->is_marked_dependent(); |
| 6983 | 1733 assert(is_contained == new_type()->is_subtype_of(k), |
|
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1734 "correct marking of potential context types"); |
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1735 return is_contained; |
|
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|
1736 } |
|
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1737 |
| 0 | 1738 #ifndef PRODUCT |
| 1739 void Dependencies::print_statistics() { | |
| 1740 if (deps_find_witness_print != 0) { | |
| 1741 // Call one final time, to flush out the data. | |
| 1742 deps_find_witness_print = -1; | |
| 1743 count_find_witness_calls(); | |
| 1744 } | |
| 1745 } | |
| 1746 #endif |