Mercurial > hg > truffle
annotate src/share/vm/code/dependencies.cpp @ 20325:43aa571c1131
8055217: Make jdk8u40 the default jprt release for hs25.40
Reviewed-by: mikael, kvn
author | amurillo |
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date | Fri, 15 Aug 2014 11:39:29 -0700 |
parents | 3c048df3ef8b |
children | bee8095780db d5b74c583ec1 |
rev | line source |
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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); | |
882 } else { | |
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883 Method* m = InstanceKlass::cast(k)->find_method(_name, _signature); |
0 | 884 if (m == NULL || !Dependencies::is_concrete_method(m)) return false; |
885 _found_methods[_num_participants] = m; | |
886 // Note: If add_participant(k) is called, | |
887 // the method m will already be memoized for it. | |
888 return true; | |
889 } | |
890 } | |
891 | |
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892 bool is_participant(Klass* k) { |
0 | 893 if (k == _participants[0]) { |
894 return true; | |
895 } else if (_num_participants <= 1) { | |
896 return false; | |
897 } else { | |
898 return in_list(k, &_participants[1]); | |
899 } | |
900 } | |
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901 bool ignore_witness(Klass* witness) { |
0 | 902 if (_record_witnesses == 0) { |
903 return false; | |
904 } else { | |
905 --_record_witnesses; | |
906 add_participant(witness); | |
907 return true; | |
908 } | |
909 } | |
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910 static bool in_list(Klass* x, Klass** list) { |
0 | 911 for (int i = 0; ; i++) { |
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912 Klass* y = list[i]; |
0 | 913 if (y == NULL) break; |
914 if (y == x) return true; | |
915 } | |
916 return false; // not in list | |
917 } | |
918 | |
919 private: | |
920 // the actual search method: | |
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921 Klass* find_witness_anywhere(Klass* context_type, |
0 | 922 bool participants_hide_witnesses, |
923 bool top_level_call = true); | |
924 // the spot-checking version: | |
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925 Klass* find_witness_in(KlassDepChange& changes, |
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926 Klass* context_type, |
0 | 927 bool participants_hide_witnesses); |
928 public: | |
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929 Klass* find_witness_subtype(Klass* context_type, KlassDepChange* changes = NULL) { |
0 | 930 assert(doing_subtype_search(), "must set up a subtype search"); |
931 // When looking for unexpected concrete types, | |
932 // do not look beneath expected ones. | |
933 const bool participants_hide_witnesses = true; | |
934 // CX > CC > C' is OK, even if C' is new. | |
935 // CX > { CC, C' } is not OK if C' is new, and C' is the witness. | |
936 if (changes != NULL) { | |
937 return find_witness_in(*changes, context_type, participants_hide_witnesses); | |
938 } else { | |
939 return find_witness_anywhere(context_type, participants_hide_witnesses); | |
940 } | |
941 } | |
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942 Klass* find_witness_definer(Klass* context_type, KlassDepChange* changes = NULL) { |
0 | 943 assert(!doing_subtype_search(), "must set up a method definer search"); |
944 // When looking for unexpected concrete methods, | |
945 // look beneath expected ones, to see if there are overrides. | |
946 const bool participants_hide_witnesses = true; | |
947 // CX.m > CC.m > C'.m is not OK, if C'.m is new, and C' is the witness. | |
948 if (changes != NULL) { | |
949 return find_witness_in(*changes, context_type, !participants_hide_witnesses); | |
950 } else { | |
951 return find_witness_anywhere(context_type, !participants_hide_witnesses); | |
952 } | |
953 } | |
954 }; | |
955 | |
956 #ifndef PRODUCT | |
957 static int deps_find_witness_calls = 0; | |
958 static int deps_find_witness_steps = 0; | |
959 static int deps_find_witness_recursions = 0; | |
960 static int deps_find_witness_singles = 0; | |
961 static int deps_find_witness_print = 0; // set to -1 to force a final print | |
962 static bool count_find_witness_calls() { | |
963 if (TraceDependencies || LogCompilation) { | |
964 int pcount = deps_find_witness_print + 1; | |
965 bool final_stats = (pcount == 0); | |
966 bool initial_call = (pcount == 1); | |
967 bool occasional_print = ((pcount & ((1<<10) - 1)) == 0); | |
968 if (pcount < 0) pcount = 1; // crude overflow protection | |
969 deps_find_witness_print = pcount; | |
970 if (VerifyDependencies && initial_call) { | |
971 tty->print_cr("Warning: TraceDependencies results may be inflated by VerifyDependencies"); | |
972 } | |
973 if (occasional_print || final_stats) { | |
974 // Every now and then dump a little info about dependency searching. | |
975 if (xtty != NULL) { | |
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976 ttyLocker ttyl; |
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977 xtty->elem("deps_find_witness calls='%d' steps='%d' recursions='%d' singles='%d'", |
0 | 978 deps_find_witness_calls, |
979 deps_find_witness_steps, | |
980 deps_find_witness_recursions, | |
981 deps_find_witness_singles); | |
982 } | |
983 if (final_stats || (TraceDependencies && WizardMode)) { | |
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984 ttyLocker ttyl; |
0 | 985 tty->print_cr("Dependency check (find_witness) " |
986 "calls=%d, steps=%d (avg=%.1f), recursions=%d, singles=%d", | |
987 deps_find_witness_calls, | |
988 deps_find_witness_steps, | |
989 (double)deps_find_witness_steps / deps_find_witness_calls, | |
990 deps_find_witness_recursions, | |
991 deps_find_witness_singles); | |
992 } | |
993 } | |
994 return true; | |
995 } | |
996 return false; | |
997 } | |
998 #else | |
999 #define count_find_witness_calls() (0) | |
1000 #endif //PRODUCT | |
1001 | |
1002 | |
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1003 Klass* ClassHierarchyWalker::find_witness_in(KlassDepChange& changes, |
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1004 Klass* context_type, |
0 | 1005 bool participants_hide_witnesses) { |
1006 assert(changes.involves_context(context_type), "irrelevant dependency"); | |
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1007 Klass* new_type = changes.new_type(); |
0 | 1008 |
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1009 (void)count_find_witness_calls(); |
0 | 1010 NOT_PRODUCT(deps_find_witness_singles++); |
1011 | |
1012 // Current thread must be in VM (not native mode, as in CI): | |
1013 assert(must_be_in_vm(), "raw oops here"); | |
1014 // Must not move the class hierarchy during this check: | |
1015 assert_locked_or_safepoint(Compile_lock); | |
1016 | |
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1017 int nof_impls = InstanceKlass::cast(context_type)->nof_implementors(); |
30 | 1018 if (nof_impls > 1) { |
1019 // Avoid this case: *I.m > { A.m, C }; B.m > C | |
1020 // %%% Until this is fixed more systematically, bail out. | |
1021 // See corresponding comment in find_witness_anywhere. | |
1022 return context_type; | |
1023 } | |
1024 | |
0 | 1025 assert(!is_participant(new_type), "only old classes are participants"); |
1026 if (participants_hide_witnesses) { | |
1027 // If the new type is a subtype of a participant, we are done. | |
1028 for (int i = 0; i < num_participants(); i++) { | |
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1029 Klass* part = participant(i); |
0 | 1030 if (part == NULL) continue; |
6983 | 1031 assert(changes.involves_context(part) == new_type->is_subtype_of(part), |
0 | 1032 "correct marking of participants, b/c new_type is unique"); |
1033 if (changes.involves_context(part)) { | |
1034 // new guy is protected from this check by previous participant | |
1035 return NULL; | |
1036 } | |
1037 } | |
1038 } | |
1039 | |
1040 if (is_witness(new_type) && | |
1041 !ignore_witness(new_type)) { | |
1042 return new_type; | |
1043 } | |
1044 | |
1045 return NULL; | |
1046 } | |
1047 | |
1048 | |
1049 // Walk hierarchy under a context type, looking for unexpected types. | |
1050 // Do not report participant types, and recursively walk beneath | |
1051 // them only if participants_hide_witnesses is false. | |
1052 // If top_level_call is false, skip testing the context type, | |
1053 // because the caller has already considered it. | |
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1054 Klass* ClassHierarchyWalker::find_witness_anywhere(Klass* context_type, |
0 | 1055 bool participants_hide_witnesses, |
1056 bool top_level_call) { | |
1057 // Current thread must be in VM (not native mode, as in CI): | |
1058 assert(must_be_in_vm(), "raw oops here"); | |
1059 // Must not move the class hierarchy during this check: | |
1060 assert_locked_or_safepoint(Compile_lock); | |
1061 | |
1062 bool do_counts = count_find_witness_calls(); | |
1063 | |
1064 // Check the root of the sub-hierarchy first. | |
1065 if (top_level_call) { | |
1066 if (do_counts) { | |
1067 NOT_PRODUCT(deps_find_witness_calls++); | |
1068 NOT_PRODUCT(deps_find_witness_steps++); | |
1069 } | |
1070 if (is_participant(context_type)) { | |
1071 if (participants_hide_witnesses) return NULL; | |
1072 // else fall through to search loop... | |
1073 } else if (is_witness(context_type) && !ignore_witness(context_type)) { | |
1074 // The context is an abstract class or interface, to start with. | |
1075 return context_type; | |
1076 } | |
1077 } | |
1078 | |
1079 // Now we must check each implementor and each subclass. | |
1080 // Use a short worklist to avoid blowing the stack. | |
1081 // Each worklist entry is a *chain* of subklass siblings to process. | |
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1082 const int CHAINMAX = 100; // >= 1 + InstanceKlass::implementors_limit |
0 | 1083 Klass* chains[CHAINMAX]; |
1084 int chaini = 0; // index into worklist | |
1085 Klass* chain; // scratch variable | |
1086 #define ADD_SUBCLASS_CHAIN(k) { \ | |
1087 assert(chaini < CHAINMAX, "oob"); \ | |
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1088 chain = InstanceKlass::cast(k)->subklass(); \ |
0 | 1089 if (chain != NULL) chains[chaini++] = chain; } |
1090 | |
1091 // Look for non-abstract subclasses. | |
1092 // (Note: Interfaces do not have subclasses.) | |
1093 ADD_SUBCLASS_CHAIN(context_type); | |
1094 | |
1095 // If it is an interface, search its direct implementors. | |
1096 // (Their subclasses are additional indirect implementors. | |
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1097 // See InstanceKlass::add_implementor.) |
0 | 1098 // (Note: nof_implementors is always zero for non-interfaces.) |
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1099 int nof_impls = InstanceKlass::cast(context_type)->nof_implementors(); |
0 | 1100 if (nof_impls > 1) { |
1101 // Avoid this case: *I.m > { A.m, C }; B.m > C | |
1102 // Here, I.m has 2 concrete implementations, but m appears unique | |
1103 // as A.m, because the search misses B.m when checking C. | |
1104 // The inherited method B.m was getting missed by the walker | |
1105 // when interface 'I' was the starting point. | |
1106 // %%% Until this is fixed more systematically, bail out. | |
1107 // (Old CHA had the same limitation.) | |
1108 return context_type; | |
1109 } | |
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1110 if (nof_impls > 0) { |
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1111 Klass* impl = InstanceKlass::cast(context_type)->implementor(); |
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1112 assert(impl != NULL, "just checking"); |
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1113 // If impl is the same as the context_type, then more than one |
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1114 // implementor has seen. No exact info in this case. |
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1115 if (impl == context_type) { |
0 | 1116 return context_type; // report an inexact witness to this sad affair |
1117 } | |
1118 if (do_counts) | |
1119 { NOT_PRODUCT(deps_find_witness_steps++); } | |
1120 if (is_participant(impl)) { | |
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1121 if (!participants_hide_witnesses) { |
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1122 ADD_SUBCLASS_CHAIN(impl); |
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1123 } |
0 | 1124 } else if (is_witness(impl) && !ignore_witness(impl)) { |
1125 return impl; | |
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1126 } else { |
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1127 ADD_SUBCLASS_CHAIN(impl); |
0 | 1128 } |
1129 } | |
1130 | |
1131 // Recursively process each non-trivial sibling chain. | |
1132 while (chaini > 0) { | |
1133 Klass* chain = chains[--chaini]; | |
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1134 for (Klass* sub = chain; sub != NULL; sub = sub->next_sibling()) { |
0 | 1135 if (do_counts) { NOT_PRODUCT(deps_find_witness_steps++); } |
1136 if (is_participant(sub)) { | |
1137 if (participants_hide_witnesses) continue; | |
1138 // else fall through to process this guy's subclasses | |
1139 } else if (is_witness(sub) && !ignore_witness(sub)) { | |
1140 return sub; | |
1141 } | |
1142 if (chaini < (VerifyDependencies? 2: CHAINMAX)) { | |
1143 // Fast path. (Partially disabled if VerifyDependencies.) | |
1144 ADD_SUBCLASS_CHAIN(sub); | |
1145 } else { | |
1146 // Worklist overflow. Do a recursive call. Should be rare. | |
1147 // The recursive call will have its own worklist, of course. | |
1148 // (Note that sub has already been tested, so that there is | |
1149 // no need for the recursive call to re-test. That's handy, | |
1150 // since the recursive call sees sub as the context_type.) | |
1151 if (do_counts) { NOT_PRODUCT(deps_find_witness_recursions++); } | |
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1152 Klass* witness = find_witness_anywhere(sub, |
0 | 1153 participants_hide_witnesses, |
1154 /*top_level_call=*/ false); | |
1155 if (witness != NULL) return witness; | |
1156 } | |
1157 } | |
1158 } | |
1159 | |
1160 // No witness found. The dependency remains unbroken. | |
1161 return NULL; | |
1162 #undef ADD_SUBCLASS_CHAIN | |
1163 } | |
1164 | |
1165 | |
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1166 bool Dependencies::is_concrete_klass(Klass* k) { |
6983 | 1167 if (k->is_abstract()) return false; |
0 | 1168 // %%% We could treat classes which are concrete but |
1169 // have not yet been instantiated as virtually abstract. | |
1170 // This would require a deoptimization barrier on first instantiation. | |
1171 //if (k->is_not_instantiated()) return false; | |
1172 return true; | |
1173 } | |
1174 | |
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1175 bool Dependencies::is_concrete_method(Method* m) { |
4060 | 1176 // Statics are irrelevant to virtual call sites. |
1177 if (m->is_static()) return false; | |
1178 | |
1179 // We could also return false if m does not yet appear to be | |
1180 // executed, if the VM version supports this distinction also. | |
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1181 // Default methods are considered "concrete" as well. |
6934 | 1182 return !m->is_abstract() && |
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1183 !m->is_overpass(); // error functions aren't concrete |
0 | 1184 } |
1185 | |
1186 | |
1187 Klass* Dependencies::find_finalizable_subclass(Klass* k) { | |
1188 if (k->is_interface()) return NULL; | |
1189 if (k->has_finalizer()) return k; | |
1190 k = k->subklass(); | |
1191 while (k != NULL) { | |
1192 Klass* result = find_finalizable_subclass(k); | |
1193 if (result != NULL) return result; | |
1194 k = k->next_sibling(); | |
1195 } | |
1196 return NULL; | |
1197 } | |
1198 | |
1199 | |
1200 bool Dependencies::is_concrete_klass(ciInstanceKlass* k) { | |
1201 if (k->is_abstract()) return false; | |
4060 | 1202 // We could also return false if k does not yet appear to be |
0 | 1203 // instantiated, if the VM version supports this distinction also. |
1204 //if (k->is_not_instantiated()) return false; | |
1205 return true; | |
1206 } | |
1207 | |
1208 bool Dependencies::is_concrete_method(ciMethod* m) { | |
1209 // Statics are irrelevant to virtual call sites. | |
1210 if (m->is_static()) return false; | |
1211 | |
4060 | 1212 // We could also return false if m does not yet appear to be |
0 | 1213 // executed, if the VM version supports this distinction also. |
1214 return !m->is_abstract(); | |
1215 } | |
1216 | |
1217 | |
1218 bool Dependencies::has_finalizable_subclass(ciInstanceKlass* k) { | |
1219 return k->has_finalizable_subclass(); | |
1220 } | |
1221 | |
1222 | |
1223 // Any use of the contents (bytecodes) of a method must be | |
1224 // marked by an "evol_method" dependency, if those contents | |
1225 // can change. (Note: A method is always dependent on itself.) | |
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1226 Klass* Dependencies::check_evol_method(Method* m) { |
0 | 1227 assert(must_be_in_vm(), "raw oops here"); |
1228 // Did somebody do a JVMTI RedefineClasses while our backs were turned? | |
1229 // Or is there a now a breakpoint? | |
1230 // (Assumes compiled code cannot handle bkpts; change if UseFastBreakpoints.) | |
1231 if (m->is_old() | |
1232 || m->number_of_breakpoints() > 0) { | |
1233 return m->method_holder(); | |
1234 } else { | |
1235 return NULL; | |
1236 } | |
1237 } | |
1238 | |
1239 // This is a strong assertion: It is that the given type | |
1240 // has no subtypes whatever. It is most useful for | |
1241 // optimizing checks on reflected types or on array types. | |
1242 // (Checks on types which are derived from real instances | |
1243 // can be optimized more strongly than this, because we | |
1244 // know that the checked type comes from a concrete type, | |
1245 // and therefore we can disregard abstract types.) | |
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1246 Klass* Dependencies::check_leaf_type(Klass* ctxk) { |
0 | 1247 assert(must_be_in_vm(), "raw oops here"); |
1248 assert_locked_or_safepoint(Compile_lock); | |
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1249 InstanceKlass* ctx = InstanceKlass::cast(ctxk); |
0 | 1250 Klass* sub = ctx->subklass(); |
1251 if (sub != NULL) { | |
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1252 return sub; |
0 | 1253 } else if (ctx->nof_implementors() != 0) { |
1254 // if it is an interface, it must be unimplemented | |
1255 // (if it is not an interface, nof_implementors is always zero) | |
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1256 Klass* impl = ctx->implementor(); |
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1257 assert(impl != NULL, "must be set"); |
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1258 return impl; |
0 | 1259 } else { |
1260 return NULL; | |
1261 } | |
1262 } | |
1263 | |
1264 // Test the assertion that conck is the only concrete subtype* of ctxk. | |
1265 // The type conck itself is allowed to have have further concrete subtypes. | |
1266 // This allows the compiler to narrow occurrences of ctxk by conck, | |
1267 // when dealing with the types of actual instances. | |
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1268 Klass* Dependencies::check_abstract_with_unique_concrete_subtype(Klass* ctxk, |
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1269 Klass* conck, |
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1270 KlassDepChange* changes) { |
0 | 1271 ClassHierarchyWalker wf(conck); |
1272 return wf.find_witness_subtype(ctxk, changes); | |
1273 } | |
1274 | |
1275 // If a non-concrete class has no concrete subtypes, it is not (yet) | |
1276 // instantiatable. This can allow the compiler to make some paths go | |
1277 // dead, if they are gated by a test of the type. | |
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1278 Klass* Dependencies::check_abstract_with_no_concrete_subtype(Klass* ctxk, |
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1279 KlassDepChange* changes) { |
0 | 1280 // Find any concrete subtype, with no participants: |
1281 ClassHierarchyWalker wf; | |
1282 return wf.find_witness_subtype(ctxk, changes); | |
1283 } | |
1284 | |
1285 | |
1286 // If a concrete class has no concrete subtypes, it can always be | |
1287 // exactly typed. This allows the use of a cheaper type test. | |
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1288 Klass* Dependencies::check_concrete_with_no_concrete_subtype(Klass* ctxk, |
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1289 KlassDepChange* changes) { |
0 | 1290 // Find any concrete subtype, with only the ctxk as participant: |
1291 ClassHierarchyWalker wf(ctxk); | |
1292 return wf.find_witness_subtype(ctxk, changes); | |
1293 } | |
1294 | |
1295 | |
1296 // Find the unique concrete proper subtype of ctxk, or NULL if there | |
1297 // is more than one concrete proper subtype. If there are no concrete | |
1298 // proper subtypes, return ctxk itself, whether it is concrete or not. | |
1299 // The returned subtype is allowed to have have further concrete subtypes. | |
1300 // That is, return CC1 for CX > CC1 > CC2, but NULL for CX > { CC1, CC2 }. | |
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1301 Klass* Dependencies::find_unique_concrete_subtype(Klass* ctxk) { |
0 | 1302 ClassHierarchyWalker wf(ctxk); // Ignore ctxk when walking. |
1303 wf.record_witnesses(1); // Record one other witness when walking. | |
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1304 Klass* wit = wf.find_witness_subtype(ctxk); |
0 | 1305 if (wit != NULL) return NULL; // Too many witnesses. |
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1306 Klass* conck = wf.participant(0); |
0 | 1307 if (conck == NULL) { |
1308 #ifndef PRODUCT | |
1309 // Make sure the dependency mechanism will pass this discovery: | |
1310 if (VerifyDependencies) { | |
1311 // Turn off dependency tracing while actually testing deps. | |
1312 FlagSetting fs(TraceDependencies, false); | |
1313 if (!Dependencies::is_concrete_klass(ctxk)) { | |
1314 guarantee(NULL == | |
1315 (void *)check_abstract_with_no_concrete_subtype(ctxk), | |
1316 "verify dep."); | |
1317 } else { | |
1318 guarantee(NULL == | |
1319 (void *)check_concrete_with_no_concrete_subtype(ctxk), | |
1320 "verify dep."); | |
1321 } | |
1322 } | |
1323 #endif //PRODUCT | |
1324 return ctxk; // Return ctxk as a flag for "no subtypes". | |
1325 } else { | |
1326 #ifndef PRODUCT | |
1327 // Make sure the dependency mechanism will pass this discovery: | |
1328 if (VerifyDependencies) { | |
1329 // Turn off dependency tracing while actually testing deps. | |
1330 FlagSetting fs(TraceDependencies, false); | |
1331 if (!Dependencies::is_concrete_klass(ctxk)) { | |
1332 guarantee(NULL == (void *) | |
1333 check_abstract_with_unique_concrete_subtype(ctxk, conck), | |
1334 "verify dep."); | |
1335 } | |
1336 } | |
1337 #endif //PRODUCT | |
1338 return conck; | |
1339 } | |
1340 } | |
1341 | |
1342 // Test the assertion that the k[12] are the only concrete subtypes of ctxk, | |
1343 // except possibly for further subtypes of k[12] themselves. | |
1344 // The context type must be abstract. The types k1 and k2 are themselves | |
1345 // allowed to have further concrete subtypes. | |
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1346 Klass* Dependencies::check_abstract_with_exclusive_concrete_subtypes( |
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1347 Klass* ctxk, |
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1348 Klass* k1, |
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1349 Klass* k2, |
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1350 KlassDepChange* changes) { |
0 | 1351 ClassHierarchyWalker wf; |
1352 wf.add_participant(k1); | |
1353 wf.add_participant(k2); | |
1354 return wf.find_witness_subtype(ctxk, changes); | |
1355 } | |
1356 | |
1357 // Search ctxk for concrete implementations. If there are klen or fewer, | |
1358 // pack them into the given array and return the number. | |
1359 // Otherwise, return -1, meaning the given array would overflow. | |
1360 // (Note that a return of 0 means there are exactly no concrete subtypes.) | |
1361 // In this search, if ctxk is concrete, it will be reported alone. | |
1362 // For any type CC reported, no proper subtypes of CC will be reported. | |
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1363 int Dependencies::find_exclusive_concrete_subtypes(Klass* ctxk, |
0 | 1364 int klen, |
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1365 Klass* karray[]) { |
0 | 1366 ClassHierarchyWalker wf; |
1367 wf.record_witnesses(klen); | |
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1368 Klass* wit = wf.find_witness_subtype(ctxk); |
0 | 1369 if (wit != NULL) return -1; // Too many witnesses. |
1370 int num = wf.num_participants(); | |
1371 assert(num <= klen, "oob"); | |
1372 // Pack the result array with the good news. | |
1373 for (int i = 0; i < num; i++) | |
1374 karray[i] = wf.participant(i); | |
1375 #ifndef PRODUCT | |
1376 // Make sure the dependency mechanism will pass this discovery: | |
1377 if (VerifyDependencies) { | |
1378 // Turn off dependency tracing while actually testing deps. | |
1379 FlagSetting fs(TraceDependencies, false); | |
1380 switch (Dependencies::is_concrete_klass(ctxk)? -1: num) { | |
1381 case -1: // ctxk was itself concrete | |
1382 guarantee(num == 1 && karray[0] == ctxk, "verify dep."); | |
1383 break; | |
1384 case 0: | |
1385 guarantee(NULL == (void *)check_abstract_with_no_concrete_subtype(ctxk), | |
1386 "verify dep."); | |
1387 break; | |
1388 case 1: | |
1389 guarantee(NULL == (void *) | |
1390 check_abstract_with_unique_concrete_subtype(ctxk, karray[0]), | |
1391 "verify dep."); | |
1392 break; | |
1393 case 2: | |
1394 guarantee(NULL == (void *) | |
1395 check_abstract_with_exclusive_concrete_subtypes(ctxk, | |
1396 karray[0], | |
1397 karray[1]), | |
1398 "verify dep."); | |
1399 break; | |
1400 default: | |
1401 ShouldNotReachHere(); // klen > 2 yet supported | |
1402 } | |
1403 } | |
1404 #endif //PRODUCT | |
1405 return num; | |
1406 } | |
1407 | |
1408 // If a class (or interface) has a unique concrete method uniqm, return NULL. | |
1409 // Otherwise, return a class that contains an interfering method. | |
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1410 Klass* Dependencies::check_unique_concrete_method(Klass* ctxk, Method* uniqm, |
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1411 KlassDepChange* changes) { |
0 | 1412 // Here is a missing optimization: If uniqm->is_final(), |
1413 // we don't really need to search beneath it for overrides. | |
1414 // This is probably not important, since we don't use dependencies | |
1415 // to track final methods. (They can't be "definalized".) | |
1416 ClassHierarchyWalker wf(uniqm->method_holder(), uniqm); | |
1417 return wf.find_witness_definer(ctxk, changes); | |
1418 } | |
1419 | |
1420 // Find the set of all non-abstract methods under ctxk that match m. | |
1421 // (The method m must be defined or inherited in ctxk.) | |
1422 // Include m itself in the set, unless it is abstract. | |
1423 // If this set has exactly one element, return that element. | |
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1424 Method* Dependencies::find_unique_concrete_method(Klass* ctxk, Method* m) { |
0 | 1425 ClassHierarchyWalker wf(m); |
1426 assert(wf.check_method_context(ctxk, m), "proper context"); | |
1427 wf.record_witnesses(1); | |
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1428 Klass* wit = wf.find_witness_definer(ctxk); |
0 | 1429 if (wit != NULL) return NULL; // Too many witnesses. |
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1430 Method* fm = wf.found_method(0); // Will be NULL if num_parts == 0. |
0 | 1431 if (Dependencies::is_concrete_method(m)) { |
1432 if (fm == NULL) { | |
1433 // It turns out that m was always the only implementation. | |
1434 fm = m; | |
1435 } else if (fm != m) { | |
1436 // Two conflicting implementations after all. | |
1437 // (This can happen if m is inherited into ctxk and fm overrides it.) | |
1438 return NULL; | |
1439 } | |
1440 } | |
1441 #ifndef PRODUCT | |
1442 // Make sure the dependency mechanism will pass this discovery: | |
1443 if (VerifyDependencies && fm != NULL) { | |
1444 guarantee(NULL == (void *)check_unique_concrete_method(ctxk, fm), | |
1445 "verify dep."); | |
1446 } | |
1447 #endif //PRODUCT | |
1448 return fm; | |
1449 } | |
1450 | |
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1451 Klass* Dependencies::check_exclusive_concrete_methods(Klass* ctxk, |
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1452 Method* m1, |
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1453 Method* m2, |
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1454 KlassDepChange* changes) { |
0 | 1455 ClassHierarchyWalker wf(m1); |
1456 wf.add_participant(m1->method_holder()); | |
1457 wf.add_participant(m2->method_holder()); | |
1458 return wf.find_witness_definer(ctxk, changes); | |
1459 } | |
1460 | |
1461 // Find the set of all non-abstract methods under ctxk that match m[0]. | |
1462 // (The method m[0] must be defined or inherited in ctxk.) | |
1463 // Include m itself in the set, unless it is abstract. | |
1464 // Fill the given array m[0..(mlen-1)] with this set, and return the length. | |
1465 // (The length may be zero if no concrete methods are found anywhere.) | |
1466 // If there are too many concrete methods to fit in marray, return -1. | |
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1467 int Dependencies::find_exclusive_concrete_methods(Klass* ctxk, |
0 | 1468 int mlen, |
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1469 Method* marray[]) { |
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1470 Method* m0 = marray[0]; |
0 | 1471 ClassHierarchyWalker wf(m0); |
1472 assert(wf.check_method_context(ctxk, m0), "proper context"); | |
1473 wf.record_witnesses(mlen); | |
1474 bool participants_hide_witnesses = true; | |
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1475 Klass* wit = wf.find_witness_definer(ctxk); |
0 | 1476 if (wit != NULL) return -1; // Too many witnesses. |
1477 int num = wf.num_participants(); | |
1478 assert(num <= mlen, "oob"); | |
1479 // Keep track of whether m is also part of the result set. | |
1480 int mfill = 0; | |
1481 assert(marray[mfill] == m0, "sanity"); | |
1482 if (Dependencies::is_concrete_method(m0)) | |
1483 mfill++; // keep m0 as marray[0], the first result | |
1484 for (int i = 0; i < num; i++) { | |
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1485 Method* fm = wf.found_method(i); |
0 | 1486 if (fm == m0) continue; // Already put this guy in the list. |
1487 if (mfill == mlen) { | |
1488 return -1; // Oops. Too many methods after all! | |
1489 } | |
1490 marray[mfill++] = fm; | |
1491 } | |
1492 #ifndef PRODUCT | |
1493 // Make sure the dependency mechanism will pass this discovery: | |
1494 if (VerifyDependencies) { | |
1495 // Turn off dependency tracing while actually testing deps. | |
1496 FlagSetting fs(TraceDependencies, false); | |
1497 switch (mfill) { | |
1498 case 1: | |
1499 guarantee(NULL == (void *)check_unique_concrete_method(ctxk, marray[0]), | |
1500 "verify dep."); | |
1501 break; | |
1502 case 2: | |
1503 guarantee(NULL == (void *) | |
1504 check_exclusive_concrete_methods(ctxk, marray[0], marray[1]), | |
1505 "verify dep."); | |
1506 break; | |
1507 default: | |
1508 ShouldNotReachHere(); // mlen > 2 yet supported | |
1509 } | |
1510 } | |
1511 #endif //PRODUCT | |
1512 return mfill; | |
1513 } | |
1514 | |
1515 | |
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1516 Klass* Dependencies::check_has_no_finalizable_subclasses(Klass* ctxk, KlassDepChange* changes) { |
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1517 Klass* search_at = ctxk; |
0 | 1518 if (changes != NULL) |
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1519 search_at = changes->new_type(); // just look at the new bit |
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1520 return find_finalizable_subclass(search_at); |
0 | 1521 } |
1522 | |
1523 | |
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1524 Klass* Dependencies::check_call_site_target_value(oop call_site, oop method_handle, CallSiteDepChange* changes) { |
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1525 assert(call_site ->is_a(SystemDictionary::CallSite_klass()), "sanity"); |
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1526 assert(method_handle->is_a(SystemDictionary::MethodHandle_klass()), "sanity"); |
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1527 if (changes == NULL) { |
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1528 // Validate all CallSites |
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1529 if (java_lang_invoke_CallSite::target(call_site) != method_handle) |
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1530 return call_site->klass(); // assertion failed |
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1531 } else { |
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1532 // Validate the given CallSite |
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1533 if (call_site == changes->call_site() && java_lang_invoke_CallSite::target(call_site) != changes->method_handle()) { |
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1534 assert(method_handle != changes->method_handle(), "must be"); |
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1535 return call_site->klass(); // assertion failed |
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1536 } |
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1537 } |
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1538 return NULL; // assertion still valid |
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1539 } |
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1540 |
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1541 |
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1542 void Dependencies::DepStream::trace_and_log_witness(Klass* witness) { |
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1543 if (witness != NULL) { |
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1544 if (TraceDependencies) { |
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1545 print_dependency(witness, /*verbose=*/ true); |
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1546 } |
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1547 // The following is a no-op unless logging is enabled: |
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1548 log_dependency(witness); |
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1549 } |
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1550 } |
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1551 |
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1552 |
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1553 Klass* Dependencies::DepStream::check_klass_dependency(KlassDepChange* changes) { |
0 | 1554 assert_locked_or_safepoint(Compile_lock); |
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1555 Dependencies::check_valid_dependency_type(type()); |
0 | 1556 |
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1557 Klass* witness = NULL; |
0 | 1558 switch (type()) { |
1559 case evol_method: | |
1560 witness = check_evol_method(method_argument(0)); | |
1561 break; | |
1562 case leaf_type: | |
1563 witness = check_leaf_type(context_type()); | |
1564 break; | |
1565 case abstract_with_unique_concrete_subtype: | |
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1566 witness = check_abstract_with_unique_concrete_subtype(context_type(), type_argument(1), changes); |
0 | 1567 break; |
1568 case abstract_with_no_concrete_subtype: | |
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1569 witness = check_abstract_with_no_concrete_subtype(context_type(), changes); |
0 | 1570 break; |
1571 case concrete_with_no_concrete_subtype: | |
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1572 witness = check_concrete_with_no_concrete_subtype(context_type(), changes); |
0 | 1573 break; |
1574 case unique_concrete_method: | |
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1575 witness = check_unique_concrete_method(context_type(), method_argument(1), changes); |
0 | 1576 break; |
1577 case abstract_with_exclusive_concrete_subtypes_2: | |
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1578 witness = check_abstract_with_exclusive_concrete_subtypes(context_type(), type_argument(1), type_argument(2), changes); |
0 | 1579 break; |
1580 case exclusive_concrete_methods_2: | |
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1581 witness = check_exclusive_concrete_methods(context_type(), method_argument(1), method_argument(2), changes); |
0 | 1582 break; |
1583 case no_finalizable_subclasses: | |
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1584 witness = check_has_no_finalizable_subclasses(context_type(), changes); |
0 | 1585 break; |
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1586 default: |
0 | 1587 witness = NULL; |
1588 break; | |
1589 } | |
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1590 trace_and_log_witness(witness); |
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1591 return witness; |
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1592 } |
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1593 |
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1594 |
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1595 Klass* Dependencies::DepStream::check_call_site_dependency(CallSiteDepChange* changes) { |
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1596 assert_locked_or_safepoint(Compile_lock); |
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1597 Dependencies::check_valid_dependency_type(type()); |
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1598 |
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1599 Klass* witness = NULL; |
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1600 switch (type()) { |
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1601 case call_site_target_value: |
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1602 witness = check_call_site_target_value(argument_oop(0), argument_oop(1), changes); |
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1603 break; |
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1604 default: |
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1605 witness = NULL; |
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1606 break; |
0 | 1607 } |
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1608 trace_and_log_witness(witness); |
0 | 1609 return witness; |
1610 } | |
1611 | |
1612 | |
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1613 Klass* Dependencies::DepStream::spot_check_dependency_at(DepChange& changes) { |
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1614 // Handle klass dependency |
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1615 if (changes.is_klass_change() && changes.as_klass_change()->involves_context(context_type())) |
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1616 return check_klass_dependency(changes.as_klass_change()); |
0 | 1617 |
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1618 // Handle CallSite dependency |
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1619 if (changes.is_call_site_change()) |
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1620 return check_call_site_dependency(changes.as_call_site_change()); |
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1621 |
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1622 // irrelevant dependency; skip it |
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1623 return NULL; |
0 | 1624 } |
1625 | |
1626 | |
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1627 void DepChange::print() { |
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1628 int nsup = 0, nint = 0; |
0 | 1629 for (ContextStream str(*this); str.next(); ) { |
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1630 Klass* k = str.klass(); |
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1631 switch (str.change_type()) { |
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1632 case Change_new_type: |
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1633 tty->print_cr(" dependee = %s", InstanceKlass::cast(k)->external_name()); |
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1634 break; |
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1635 case Change_new_sub: |
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1636 if (!WizardMode) { |
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1637 ++nsup; |
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1638 } else { |
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1639 tty->print_cr(" context super = %s", InstanceKlass::cast(k)->external_name()); |
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1640 } |
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1641 break; |
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1642 case Change_new_impl: |
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1643 if (!WizardMode) { |
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1644 ++nint; |
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1645 } else { |
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1646 tty->print_cr(" context interface = %s", InstanceKlass::cast(k)->external_name()); |
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1647 } |
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1648 break; |
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1649 } |
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1650 } |
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1651 if (nsup + nint != 0) { |
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1652 tty->print_cr(" context supers = %d, interfaces = %d", nsup, nint); |
0 | 1653 } |
1654 } | |
1655 | |
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1656 void DepChange::ContextStream::start() { |
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1657 Klass* new_type = _changes.is_klass_change() ? _changes.as_klass_change()->new_type() : (Klass*) NULL; |
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1658 _change_type = (new_type == NULL ? NO_CHANGE : Start_Klass); |
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1659 _klass = new_type; |
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1660 _ti_base = NULL; |
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1661 _ti_index = 0; |
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1662 _ti_limit = 0; |
0 | 1663 } |
1664 | |
1665 bool DepChange::ContextStream::next() { | |
1666 switch (_change_type) { | |
1667 case Start_Klass: // initial state; _klass is the new type | |
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1668 _ti_base = InstanceKlass::cast(_klass)->transitive_interfaces(); |
0 | 1669 _ti_index = 0; |
1670 _change_type = Change_new_type; | |
1671 return true; | |
1672 case Change_new_type: | |
1673 // fall through: | |
1674 _change_type = Change_new_sub; | |
1675 case Change_new_sub: | |
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1676 // 6598190: brackets workaround Sun Studio C++ compiler bug 6629277 |
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1677 { |
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1678 _klass = InstanceKlass::cast(_klass)->super(); |
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1679 if (_klass != NULL) { |
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1680 return true; |
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1681 } |
0 | 1682 } |
1683 // else set up _ti_limit and fall through: | |
1684 _ti_limit = (_ti_base == NULL) ? 0 : _ti_base->length(); | |
1685 _change_type = Change_new_impl; | |
1686 case Change_new_impl: | |
1687 if (_ti_index < _ti_limit) { | |
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1688 _klass = _ti_base->at(_ti_index++); |
0 | 1689 return true; |
1690 } | |
1691 // fall through: | |
1692 _change_type = NO_CHANGE; // iterator is exhausted | |
1693 case NO_CHANGE: | |
1694 break; | |
1695 default: | |
1696 ShouldNotReachHere(); | |
1697 } | |
1698 return false; | |
1699 } | |
1700 | |
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1701 void KlassDepChange::initialize() { |
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1702 // entire transaction must be under this lock: |
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1703 assert_lock_strong(Compile_lock); |
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1704 |
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1705 // Mark all dependee and all its superclasses |
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1706 // Mark transitive interfaces |
0 | 1707 for (ContextStream str(*this); str.next(); ) { |
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1708 Klass* d = str.klass(); |
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1709 assert(!InstanceKlass::cast(d)->is_marked_dependent(), "checking"); |
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1710 InstanceKlass::cast(d)->set_is_marked_dependent(true); |
0 | 1711 } |
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1712 } |
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1713 |
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1714 KlassDepChange::~KlassDepChange() { |
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1715 // Unmark all dependee and all its superclasses |
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1716 // Unmark transitive interfaces |
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1717 for (ContextStream str(*this); str.next(); ) { |
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1718 Klass* d = str.klass(); |
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1719 InstanceKlass::cast(d)->set_is_marked_dependent(false); |
0 | 1720 } |
1721 } | |
1722 | |
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1723 bool KlassDepChange::involves_context(Klass* k) { |
6983 | 1724 if (k == NULL || !k->oop_is_instance()) { |
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1725 return false; |
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1726 } |
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1727 InstanceKlass* ik = InstanceKlass::cast(k); |
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1728 bool is_contained = ik->is_marked_dependent(); |
6983 | 1729 assert(is_contained == new_type()->is_subtype_of(k), |
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1730 "correct marking of potential context types"); |
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1731 return is_contained; |
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1732 } |
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1733 |
0 | 1734 #ifndef PRODUCT |
1735 void Dependencies::print_statistics() { | |
1736 if (deps_find_witness_print != 0) { | |
1737 // Call one final time, to flush out the data. | |
1738 deps_find_witness_print = -1; | |
1739 count_find_witness_calls(); | |
1740 } | |
1741 } | |
1742 #endif |