Mercurial > hg > graal-jvmci-8
annotate src/share/vm/code/dependencies.cpp @ 21823:d5b74c583ec1
8064524: Compiler code generation improvements
Reviewed-by: jrose, acorn, vlivanov
author | drchase |
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date | Mon, 01 Dec 2014 13:06:20 -0500 |
parents | 3c048df3ef8b |
children | 41c3c456e326 |
rev | line source |
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0 | 1 /* |
21823 | 2 * Copyright (c) 2005, 2014, 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 "; |
21823 | 563 put_star = !Dependencies::is_concrete_method((Method*)arg.metadata_value(), NULL); |
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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 } | |
21823 | 848 if ( !Dependencies::is_concrete_method(lm, k) |
849 && !Dependencies::is_concrete_method(m, ctxk) | |
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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 { | |
21823 | 883 // Search class hierarchy first. |
884 Method* m = InstanceKlass::cast(k)->find_instance_method(_name, _signature); | |
885 if (!Dependencies::is_concrete_method(m, k)) { | |
886 // Check interface defaults also, if any exist. | |
887 Array<Method*>* default_methods = InstanceKlass::cast(k)->default_methods(); | |
888 if (default_methods == NULL) | |
889 return false; | |
890 m = InstanceKlass::cast(k)->find_method(default_methods, _name, _signature); | |
891 if (!Dependencies::is_concrete_method(m, NULL)) | |
892 return false; | |
893 } | |
0 | 894 _found_methods[_num_participants] = m; |
895 // Note: If add_participant(k) is called, | |
896 // the method m will already be memoized for it. | |
897 return true; | |
898 } | |
899 } | |
900 | |
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901 bool is_participant(Klass* k) { |
0 | 902 if (k == _participants[0]) { |
903 return true; | |
904 } else if (_num_participants <= 1) { | |
905 return false; | |
906 } else { | |
907 return in_list(k, &_participants[1]); | |
908 } | |
909 } | |
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910 bool ignore_witness(Klass* witness) { |
0 | 911 if (_record_witnesses == 0) { |
912 return false; | |
913 } else { | |
914 --_record_witnesses; | |
915 add_participant(witness); | |
916 return true; | |
917 } | |
918 } | |
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919 static bool in_list(Klass* x, Klass** list) { |
0 | 920 for (int i = 0; ; i++) { |
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921 Klass* y = list[i]; |
0 | 922 if (y == NULL) break; |
923 if (y == x) return true; | |
924 } | |
925 return false; // not in list | |
926 } | |
927 | |
928 private: | |
929 // the actual search method: | |
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930 Klass* find_witness_anywhere(Klass* context_type, |
0 | 931 bool participants_hide_witnesses, |
932 bool top_level_call = true); | |
933 // the spot-checking version: | |
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934 Klass* find_witness_in(KlassDepChange& changes, |
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935 Klass* context_type, |
0 | 936 bool participants_hide_witnesses); |
937 public: | |
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938 Klass* find_witness_subtype(Klass* context_type, KlassDepChange* changes = NULL) { |
0 | 939 assert(doing_subtype_search(), "must set up a subtype search"); |
940 // When looking for unexpected concrete types, | |
941 // do not look beneath expected ones. | |
942 const bool participants_hide_witnesses = true; | |
943 // CX > CC > C' is OK, even if C' is new. | |
944 // CX > { CC, C' } is not OK if C' is new, and C' is the witness. | |
945 if (changes != NULL) { | |
946 return find_witness_in(*changes, context_type, participants_hide_witnesses); | |
947 } else { | |
948 return find_witness_anywhere(context_type, participants_hide_witnesses); | |
949 } | |
950 } | |
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951 Klass* find_witness_definer(Klass* context_type, KlassDepChange* changes = NULL) { |
0 | 952 assert(!doing_subtype_search(), "must set up a method definer search"); |
953 // When looking for unexpected concrete methods, | |
954 // look beneath expected ones, to see if there are overrides. | |
955 const bool participants_hide_witnesses = true; | |
956 // CX.m > CC.m > C'.m is not OK, if C'.m is new, and C' is the witness. | |
957 if (changes != NULL) { | |
958 return find_witness_in(*changes, context_type, !participants_hide_witnesses); | |
959 } else { | |
960 return find_witness_anywhere(context_type, !participants_hide_witnesses); | |
961 } | |
962 } | |
963 }; | |
964 | |
965 #ifndef PRODUCT | |
966 static int deps_find_witness_calls = 0; | |
967 static int deps_find_witness_steps = 0; | |
968 static int deps_find_witness_recursions = 0; | |
969 static int deps_find_witness_singles = 0; | |
970 static int deps_find_witness_print = 0; // set to -1 to force a final print | |
971 static bool count_find_witness_calls() { | |
972 if (TraceDependencies || LogCompilation) { | |
973 int pcount = deps_find_witness_print + 1; | |
974 bool final_stats = (pcount == 0); | |
975 bool initial_call = (pcount == 1); | |
976 bool occasional_print = ((pcount & ((1<<10) - 1)) == 0); | |
977 if (pcount < 0) pcount = 1; // crude overflow protection | |
978 deps_find_witness_print = pcount; | |
979 if (VerifyDependencies && initial_call) { | |
980 tty->print_cr("Warning: TraceDependencies results may be inflated by VerifyDependencies"); | |
981 } | |
982 if (occasional_print || final_stats) { | |
983 // Every now and then dump a little info about dependency searching. | |
984 if (xtty != NULL) { | |
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985 ttyLocker ttyl; |
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986 xtty->elem("deps_find_witness calls='%d' steps='%d' recursions='%d' singles='%d'", |
0 | 987 deps_find_witness_calls, |
988 deps_find_witness_steps, | |
989 deps_find_witness_recursions, | |
990 deps_find_witness_singles); | |
991 } | |
992 if (final_stats || (TraceDependencies && WizardMode)) { | |
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993 ttyLocker ttyl; |
0 | 994 tty->print_cr("Dependency check (find_witness) " |
995 "calls=%d, steps=%d (avg=%.1f), recursions=%d, singles=%d", | |
996 deps_find_witness_calls, | |
997 deps_find_witness_steps, | |
998 (double)deps_find_witness_steps / deps_find_witness_calls, | |
999 deps_find_witness_recursions, | |
1000 deps_find_witness_singles); | |
1001 } | |
1002 } | |
1003 return true; | |
1004 } | |
1005 return false; | |
1006 } | |
1007 #else | |
1008 #define count_find_witness_calls() (0) | |
1009 #endif //PRODUCT | |
1010 | |
1011 | |
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1012 Klass* ClassHierarchyWalker::find_witness_in(KlassDepChange& changes, |
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1013 Klass* context_type, |
0 | 1014 bool participants_hide_witnesses) { |
1015 assert(changes.involves_context(context_type), "irrelevant dependency"); | |
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1016 Klass* new_type = changes.new_type(); |
0 | 1017 |
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1018 (void)count_find_witness_calls(); |
0 | 1019 NOT_PRODUCT(deps_find_witness_singles++); |
1020 | |
1021 // Current thread must be in VM (not native mode, as in CI): | |
1022 assert(must_be_in_vm(), "raw oops here"); | |
1023 // Must not move the class hierarchy during this check: | |
1024 assert_locked_or_safepoint(Compile_lock); | |
1025 | |
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1026 int nof_impls = InstanceKlass::cast(context_type)->nof_implementors(); |
30 | 1027 if (nof_impls > 1) { |
1028 // Avoid this case: *I.m > { A.m, C }; B.m > C | |
1029 // %%% Until this is fixed more systematically, bail out. | |
1030 // See corresponding comment in find_witness_anywhere. | |
1031 return context_type; | |
1032 } | |
1033 | |
0 | 1034 assert(!is_participant(new_type), "only old classes are participants"); |
1035 if (participants_hide_witnesses) { | |
1036 // If the new type is a subtype of a participant, we are done. | |
1037 for (int i = 0; i < num_participants(); i++) { | |
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1038 Klass* part = participant(i); |
0 | 1039 if (part == NULL) continue; |
6983 | 1040 assert(changes.involves_context(part) == new_type->is_subtype_of(part), |
0 | 1041 "correct marking of participants, b/c new_type is unique"); |
1042 if (changes.involves_context(part)) { | |
1043 // new guy is protected from this check by previous participant | |
1044 return NULL; | |
1045 } | |
1046 } | |
1047 } | |
1048 | |
1049 if (is_witness(new_type) && | |
1050 !ignore_witness(new_type)) { | |
1051 return new_type; | |
1052 } | |
1053 | |
1054 return NULL; | |
1055 } | |
1056 | |
1057 | |
1058 // Walk hierarchy under a context type, looking for unexpected types. | |
1059 // Do not report participant types, and recursively walk beneath | |
1060 // them only if participants_hide_witnesses is false. | |
1061 // If top_level_call is false, skip testing the context type, | |
1062 // because the caller has already considered it. | |
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1063 Klass* ClassHierarchyWalker::find_witness_anywhere(Klass* context_type, |
0 | 1064 bool participants_hide_witnesses, |
1065 bool top_level_call) { | |
1066 // Current thread must be in VM (not native mode, as in CI): | |
1067 assert(must_be_in_vm(), "raw oops here"); | |
1068 // Must not move the class hierarchy during this check: | |
1069 assert_locked_or_safepoint(Compile_lock); | |
1070 | |
1071 bool do_counts = count_find_witness_calls(); | |
1072 | |
1073 // Check the root of the sub-hierarchy first. | |
1074 if (top_level_call) { | |
1075 if (do_counts) { | |
1076 NOT_PRODUCT(deps_find_witness_calls++); | |
1077 NOT_PRODUCT(deps_find_witness_steps++); | |
1078 } | |
1079 if (is_participant(context_type)) { | |
1080 if (participants_hide_witnesses) return NULL; | |
1081 // else fall through to search loop... | |
1082 } else if (is_witness(context_type) && !ignore_witness(context_type)) { | |
1083 // The context is an abstract class or interface, to start with. | |
1084 return context_type; | |
1085 } | |
1086 } | |
1087 | |
1088 // Now we must check each implementor and each subclass. | |
1089 // Use a short worklist to avoid blowing the stack. | |
1090 // Each worklist entry is a *chain* of subklass siblings to process. | |
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1091 const int CHAINMAX = 100; // >= 1 + InstanceKlass::implementors_limit |
0 | 1092 Klass* chains[CHAINMAX]; |
1093 int chaini = 0; // index into worklist | |
1094 Klass* chain; // scratch variable | |
1095 #define ADD_SUBCLASS_CHAIN(k) { \ | |
1096 assert(chaini < CHAINMAX, "oob"); \ | |
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1097 chain = InstanceKlass::cast(k)->subklass(); \ |
0 | 1098 if (chain != NULL) chains[chaini++] = chain; } |
1099 | |
1100 // Look for non-abstract subclasses. | |
1101 // (Note: Interfaces do not have subclasses.) | |
1102 ADD_SUBCLASS_CHAIN(context_type); | |
1103 | |
1104 // If it is an interface, search its direct implementors. | |
1105 // (Their subclasses are additional indirect implementors. | |
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1106 // See InstanceKlass::add_implementor.) |
0 | 1107 // (Note: nof_implementors is always zero for non-interfaces.) |
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1108 int nof_impls = InstanceKlass::cast(context_type)->nof_implementors(); |
0 | 1109 if (nof_impls > 1) { |
1110 // Avoid this case: *I.m > { A.m, C }; B.m > C | |
1111 // Here, I.m has 2 concrete implementations, but m appears unique | |
1112 // as A.m, because the search misses B.m when checking C. | |
1113 // The inherited method B.m was getting missed by the walker | |
1114 // when interface 'I' was the starting point. | |
1115 // %%% Until this is fixed more systematically, bail out. | |
1116 // (Old CHA had the same limitation.) | |
1117 return context_type; | |
1118 } | |
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1119 if (nof_impls > 0) { |
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1120 Klass* impl = InstanceKlass::cast(context_type)->implementor(); |
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1121 assert(impl != NULL, "just checking"); |
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1122 // If impl is the same as the context_type, then more than one |
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1123 // implementor has seen. No exact info in this case. |
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1124 if (impl == context_type) { |
0 | 1125 return context_type; // report an inexact witness to this sad affair |
1126 } | |
1127 if (do_counts) | |
1128 { NOT_PRODUCT(deps_find_witness_steps++); } | |
1129 if (is_participant(impl)) { | |
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1130 if (!participants_hide_witnesses) { |
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1131 ADD_SUBCLASS_CHAIN(impl); |
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1132 } |
0 | 1133 } else if (is_witness(impl) && !ignore_witness(impl)) { |
1134 return impl; | |
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1135 } else { |
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1136 ADD_SUBCLASS_CHAIN(impl); |
0 | 1137 } |
1138 } | |
1139 | |
1140 // Recursively process each non-trivial sibling chain. | |
1141 while (chaini > 0) { | |
1142 Klass* chain = chains[--chaini]; | |
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1143 for (Klass* sub = chain; sub != NULL; sub = sub->next_sibling()) { |
0 | 1144 if (do_counts) { NOT_PRODUCT(deps_find_witness_steps++); } |
1145 if (is_participant(sub)) { | |
1146 if (participants_hide_witnesses) continue; | |
1147 // else fall through to process this guy's subclasses | |
1148 } else if (is_witness(sub) && !ignore_witness(sub)) { | |
1149 return sub; | |
1150 } | |
1151 if (chaini < (VerifyDependencies? 2: CHAINMAX)) { | |
1152 // Fast path. (Partially disabled if VerifyDependencies.) | |
1153 ADD_SUBCLASS_CHAIN(sub); | |
1154 } else { | |
1155 // Worklist overflow. Do a recursive call. Should be rare. | |
1156 // The recursive call will have its own worklist, of course. | |
1157 // (Note that sub has already been tested, so that there is | |
1158 // no need for the recursive call to re-test. That's handy, | |
1159 // since the recursive call sees sub as the context_type.) | |
1160 if (do_counts) { NOT_PRODUCT(deps_find_witness_recursions++); } | |
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1161 Klass* witness = find_witness_anywhere(sub, |
0 | 1162 participants_hide_witnesses, |
1163 /*top_level_call=*/ false); | |
1164 if (witness != NULL) return witness; | |
1165 } | |
1166 } | |
1167 } | |
1168 | |
1169 // No witness found. The dependency remains unbroken. | |
1170 return NULL; | |
1171 #undef ADD_SUBCLASS_CHAIN | |
1172 } | |
1173 | |
1174 | |
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1175 bool Dependencies::is_concrete_klass(Klass* k) { |
6983 | 1176 if (k->is_abstract()) return false; |
0 | 1177 // %%% We could treat classes which are concrete but |
1178 // have not yet been instantiated as virtually abstract. | |
1179 // This would require a deoptimization barrier on first instantiation. | |
1180 //if (k->is_not_instantiated()) return false; | |
1181 return true; | |
1182 } | |
1183 | |
21823 | 1184 bool Dependencies::is_concrete_method(Method* m, Klass * k) { |
1185 // NULL is not a concrete method, | |
1186 // statics are irrelevant to virtual call sites, | |
1187 // abstract methods are not concrete, | |
1188 // overpass (error) methods are not concrete if k is abstract | |
1189 // | |
1190 // note "true" is conservative answer -- | |
1191 // overpass clause is false if k == NULL, implies return true if | |
1192 // answer depends on overpass clause. | |
1193 return ! ( m == NULL || m -> is_static() || m -> is_abstract() || | |
1194 m->is_overpass() && k != NULL && k -> is_abstract() ); | |
0 | 1195 } |
1196 | |
1197 | |
1198 Klass* Dependencies::find_finalizable_subclass(Klass* k) { | |
1199 if (k->is_interface()) return NULL; | |
1200 if (k->has_finalizer()) return k; | |
1201 k = k->subklass(); | |
1202 while (k != NULL) { | |
1203 Klass* result = find_finalizable_subclass(k); | |
1204 if (result != NULL) return result; | |
1205 k = k->next_sibling(); | |
1206 } | |
1207 return NULL; | |
1208 } | |
1209 | |
1210 | |
1211 bool Dependencies::is_concrete_klass(ciInstanceKlass* k) { | |
1212 if (k->is_abstract()) return false; | |
4060 | 1213 // We could also return false if k does not yet appear to be |
0 | 1214 // instantiated, if the VM version supports this distinction also. |
1215 //if (k->is_not_instantiated()) return false; | |
1216 return true; | |
1217 } | |
1218 | |
1219 bool Dependencies::has_finalizable_subclass(ciInstanceKlass* k) { | |
1220 return k->has_finalizable_subclass(); | |
1221 } | |
1222 | |
1223 | |
1224 // Any use of the contents (bytecodes) of a method must be | |
1225 // marked by an "evol_method" dependency, if those contents | |
1226 // can change. (Note: A method is always dependent on itself.) | |
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1227 Klass* Dependencies::check_evol_method(Method* m) { |
0 | 1228 assert(must_be_in_vm(), "raw oops here"); |
1229 // Did somebody do a JVMTI RedefineClasses while our backs were turned? | |
1230 // Or is there a now a breakpoint? | |
1231 // (Assumes compiled code cannot handle bkpts; change if UseFastBreakpoints.) | |
1232 if (m->is_old() | |
1233 || m->number_of_breakpoints() > 0) { | |
1234 return m->method_holder(); | |
1235 } else { | |
1236 return NULL; | |
1237 } | |
1238 } | |
1239 | |
1240 // This is a strong assertion: It is that the given type | |
1241 // has no subtypes whatever. It is most useful for | |
1242 // optimizing checks on reflected types or on array types. | |
1243 // (Checks on types which are derived from real instances | |
1244 // can be optimized more strongly than this, because we | |
1245 // know that the checked type comes from a concrete type, | |
1246 // and therefore we can disregard abstract types.) | |
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1247 Klass* Dependencies::check_leaf_type(Klass* ctxk) { |
0 | 1248 assert(must_be_in_vm(), "raw oops here"); |
1249 assert_locked_or_safepoint(Compile_lock); | |
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1250 InstanceKlass* ctx = InstanceKlass::cast(ctxk); |
0 | 1251 Klass* sub = ctx->subklass(); |
1252 if (sub != NULL) { | |
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1253 return sub; |
0 | 1254 } else if (ctx->nof_implementors() != 0) { |
1255 // if it is an interface, it must be unimplemented | |
1256 // (if it is not an interface, nof_implementors is always zero) | |
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1257 Klass* impl = ctx->implementor(); |
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1258 assert(impl != NULL, "must be set"); |
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1259 return impl; |
0 | 1260 } else { |
1261 return NULL; | |
1262 } | |
1263 } | |
1264 | |
1265 // Test the assertion that conck is the only concrete subtype* of ctxk. | |
1266 // The type conck itself is allowed to have have further concrete subtypes. | |
1267 // This allows the compiler to narrow occurrences of ctxk by conck, | |
1268 // when dealing with the types of actual instances. | |
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1269 Klass* Dependencies::check_abstract_with_unique_concrete_subtype(Klass* ctxk, |
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1270 Klass* conck, |
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1271 KlassDepChange* changes) { |
0 | 1272 ClassHierarchyWalker wf(conck); |
1273 return wf.find_witness_subtype(ctxk, changes); | |
1274 } | |
1275 | |
1276 // If a non-concrete class has no concrete subtypes, it is not (yet) | |
1277 // instantiatable. This can allow the compiler to make some paths go | |
1278 // dead, if they are gated by a test of the type. | |
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1279 Klass* Dependencies::check_abstract_with_no_concrete_subtype(Klass* ctxk, |
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1280 KlassDepChange* changes) { |
0 | 1281 // Find any concrete subtype, with no participants: |
1282 ClassHierarchyWalker wf; | |
1283 return wf.find_witness_subtype(ctxk, changes); | |
1284 } | |
1285 | |
1286 | |
1287 // If a concrete class has no concrete subtypes, it can always be | |
1288 // exactly typed. This allows the use of a cheaper type test. | |
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1289 Klass* Dependencies::check_concrete_with_no_concrete_subtype(Klass* ctxk, |
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1290 KlassDepChange* changes) { |
0 | 1291 // Find any concrete subtype, with only the ctxk as participant: |
1292 ClassHierarchyWalker wf(ctxk); | |
1293 return wf.find_witness_subtype(ctxk, changes); | |
1294 } | |
1295 | |
1296 | |
1297 // Find the unique concrete proper subtype of ctxk, or NULL if there | |
1298 // is more than one concrete proper subtype. If there are no concrete | |
1299 // proper subtypes, return ctxk itself, whether it is concrete or not. | |
1300 // The returned subtype is allowed to have have further concrete subtypes. | |
1301 // That is, return CC1 for CX > CC1 > CC2, but NULL for CX > { CC1, CC2 }. | |
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1302 Klass* Dependencies::find_unique_concrete_subtype(Klass* ctxk) { |
0 | 1303 ClassHierarchyWalker wf(ctxk); // Ignore ctxk when walking. |
1304 wf.record_witnesses(1); // Record one other witness when walking. | |
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1305 Klass* wit = wf.find_witness_subtype(ctxk); |
0 | 1306 if (wit != NULL) return NULL; // Too many witnesses. |
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1307 Klass* conck = wf.participant(0); |
0 | 1308 if (conck == NULL) { |
1309 #ifndef PRODUCT | |
1310 // Make sure the dependency mechanism will pass this discovery: | |
1311 if (VerifyDependencies) { | |
1312 // Turn off dependency tracing while actually testing deps. | |
1313 FlagSetting fs(TraceDependencies, false); | |
1314 if (!Dependencies::is_concrete_klass(ctxk)) { | |
1315 guarantee(NULL == | |
1316 (void *)check_abstract_with_no_concrete_subtype(ctxk), | |
1317 "verify dep."); | |
1318 } else { | |
1319 guarantee(NULL == | |
1320 (void *)check_concrete_with_no_concrete_subtype(ctxk), | |
1321 "verify dep."); | |
1322 } | |
1323 } | |
1324 #endif //PRODUCT | |
1325 return ctxk; // Return ctxk as a flag for "no subtypes". | |
1326 } else { | |
1327 #ifndef PRODUCT | |
1328 // Make sure the dependency mechanism will pass this discovery: | |
1329 if (VerifyDependencies) { | |
1330 // Turn off dependency tracing while actually testing deps. | |
1331 FlagSetting fs(TraceDependencies, false); | |
1332 if (!Dependencies::is_concrete_klass(ctxk)) { | |
1333 guarantee(NULL == (void *) | |
1334 check_abstract_with_unique_concrete_subtype(ctxk, conck), | |
1335 "verify dep."); | |
1336 } | |
1337 } | |
1338 #endif //PRODUCT | |
1339 return conck; | |
1340 } | |
1341 } | |
1342 | |
1343 // Test the assertion that the k[12] are the only concrete subtypes of ctxk, | |
1344 // except possibly for further subtypes of k[12] themselves. | |
1345 // The context type must be abstract. The types k1 and k2 are themselves | |
1346 // allowed to have further concrete subtypes. | |
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1347 Klass* Dependencies::check_abstract_with_exclusive_concrete_subtypes( |
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1348 Klass* ctxk, |
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1349 Klass* k1, |
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1350 Klass* k2, |
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1351 KlassDepChange* changes) { |
0 | 1352 ClassHierarchyWalker wf; |
1353 wf.add_participant(k1); | |
1354 wf.add_participant(k2); | |
1355 return wf.find_witness_subtype(ctxk, changes); | |
1356 } | |
1357 | |
1358 // Search ctxk for concrete implementations. If there are klen or fewer, | |
1359 // pack them into the given array and return the number. | |
1360 // Otherwise, return -1, meaning the given array would overflow. | |
1361 // (Note that a return of 0 means there are exactly no concrete subtypes.) | |
1362 // In this search, if ctxk is concrete, it will be reported alone. | |
1363 // For any type CC reported, no proper subtypes of CC will be reported. | |
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1364 int Dependencies::find_exclusive_concrete_subtypes(Klass* ctxk, |
0 | 1365 int klen, |
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1366 Klass* karray[]) { |
0 | 1367 ClassHierarchyWalker wf; |
1368 wf.record_witnesses(klen); | |
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1369 Klass* wit = wf.find_witness_subtype(ctxk); |
0 | 1370 if (wit != NULL) return -1; // Too many witnesses. |
1371 int num = wf.num_participants(); | |
1372 assert(num <= klen, "oob"); | |
1373 // Pack the result array with the good news. | |
1374 for (int i = 0; i < num; i++) | |
1375 karray[i] = wf.participant(i); | |
1376 #ifndef PRODUCT | |
1377 // Make sure the dependency mechanism will pass this discovery: | |
1378 if (VerifyDependencies) { | |
1379 // Turn off dependency tracing while actually testing deps. | |
1380 FlagSetting fs(TraceDependencies, false); | |
1381 switch (Dependencies::is_concrete_klass(ctxk)? -1: num) { | |
1382 case -1: // ctxk was itself concrete | |
1383 guarantee(num == 1 && karray[0] == ctxk, "verify dep."); | |
1384 break; | |
1385 case 0: | |
1386 guarantee(NULL == (void *)check_abstract_with_no_concrete_subtype(ctxk), | |
1387 "verify dep."); | |
1388 break; | |
1389 case 1: | |
1390 guarantee(NULL == (void *) | |
1391 check_abstract_with_unique_concrete_subtype(ctxk, karray[0]), | |
1392 "verify dep."); | |
1393 break; | |
1394 case 2: | |
1395 guarantee(NULL == (void *) | |
1396 check_abstract_with_exclusive_concrete_subtypes(ctxk, | |
1397 karray[0], | |
1398 karray[1]), | |
1399 "verify dep."); | |
1400 break; | |
1401 default: | |
1402 ShouldNotReachHere(); // klen > 2 yet supported | |
1403 } | |
1404 } | |
1405 #endif //PRODUCT | |
1406 return num; | |
1407 } | |
1408 | |
1409 // If a class (or interface) has a unique concrete method uniqm, return NULL. | |
1410 // Otherwise, return a class that contains an interfering method. | |
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1411 Klass* Dependencies::check_unique_concrete_method(Klass* ctxk, Method* uniqm, |
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1412 KlassDepChange* changes) { |
0 | 1413 // Here is a missing optimization: If uniqm->is_final(), |
1414 // we don't really need to search beneath it for overrides. | |
1415 // This is probably not important, since we don't use dependencies | |
1416 // to track final methods. (They can't be "definalized".) | |
1417 ClassHierarchyWalker wf(uniqm->method_holder(), uniqm); | |
1418 return wf.find_witness_definer(ctxk, changes); | |
1419 } | |
1420 | |
1421 // Find the set of all non-abstract methods under ctxk that match m. | |
1422 // (The method m must be defined or inherited in ctxk.) | |
1423 // Include m itself in the set, unless it is abstract. | |
1424 // If this set has exactly one element, return that element. | |
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1425 Method* Dependencies::find_unique_concrete_method(Klass* ctxk, Method* m) { |
0 | 1426 ClassHierarchyWalker wf(m); |
1427 assert(wf.check_method_context(ctxk, m), "proper context"); | |
1428 wf.record_witnesses(1); | |
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1429 Klass* wit = wf.find_witness_definer(ctxk); |
0 | 1430 if (wit != NULL) return NULL; // Too many witnesses. |
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1431 Method* fm = wf.found_method(0); // Will be NULL if num_parts == 0. |
21823 | 1432 if (Dependencies::is_concrete_method(m, ctxk)) { |
0 | 1433 if (fm == NULL) { |
1434 // It turns out that m was always the only implementation. | |
1435 fm = m; | |
1436 } else if (fm != m) { | |
1437 // Two conflicting implementations after all. | |
1438 // (This can happen if m is inherited into ctxk and fm overrides it.) | |
1439 return NULL; | |
1440 } | |
1441 } | |
1442 #ifndef PRODUCT | |
1443 // Make sure the dependency mechanism will pass this discovery: | |
1444 if (VerifyDependencies && fm != NULL) { | |
1445 guarantee(NULL == (void *)check_unique_concrete_method(ctxk, fm), | |
1446 "verify dep."); | |
1447 } | |
1448 #endif //PRODUCT | |
1449 return fm; | |
1450 } | |
1451 | |
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1452 Klass* Dependencies::check_exclusive_concrete_methods(Klass* ctxk, |
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1453 Method* m1, |
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1454 Method* m2, |
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1455 KlassDepChange* changes) { |
0 | 1456 ClassHierarchyWalker wf(m1); |
1457 wf.add_participant(m1->method_holder()); | |
1458 wf.add_participant(m2->method_holder()); | |
1459 return wf.find_witness_definer(ctxk, changes); | |
1460 } | |
1461 | |
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1462 Klass* Dependencies::check_has_no_finalizable_subclasses(Klass* ctxk, KlassDepChange* changes) { |
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1463 Klass* search_at = ctxk; |
0 | 1464 if (changes != NULL) |
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1465 search_at = changes->new_type(); // just look at the new bit |
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1466 return find_finalizable_subclass(search_at); |
0 | 1467 } |
1468 | |
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1469 Klass* Dependencies::check_call_site_target_value(oop call_site, oop method_handle, CallSiteDepChange* changes) { |
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1470 assert(call_site ->is_a(SystemDictionary::CallSite_klass()), "sanity"); |
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1471 assert(method_handle->is_a(SystemDictionary::MethodHandle_klass()), "sanity"); |
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1472 if (changes == NULL) { |
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1473 // Validate all CallSites |
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1474 if (java_lang_invoke_CallSite::target(call_site) != method_handle) |
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1475 return call_site->klass(); // assertion failed |
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1476 } else { |
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1477 // Validate the given CallSite |
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1478 if (call_site == changes->call_site() && java_lang_invoke_CallSite::target(call_site) != changes->method_handle()) { |
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1479 assert(method_handle != changes->method_handle(), "must be"); |
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1480 return call_site->klass(); // assertion failed |
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1481 } |
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1482 } |
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1483 return NULL; // assertion still valid |
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1484 } |
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1485 |
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1486 |
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1487 void Dependencies::DepStream::trace_and_log_witness(Klass* witness) { |
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1488 if (witness != NULL) { |
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1489 if (TraceDependencies) { |
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1490 print_dependency(witness, /*verbose=*/ true); |
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1491 } |
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1492 // The following is a no-op unless logging is enabled: |
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1493 log_dependency(witness); |
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1494 } |
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1495 } |
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1496 |
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1497 |
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1498 Klass* Dependencies::DepStream::check_klass_dependency(KlassDepChange* changes) { |
0 | 1499 assert_locked_or_safepoint(Compile_lock); |
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1500 Dependencies::check_valid_dependency_type(type()); |
0 | 1501 |
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1502 Klass* witness = NULL; |
0 | 1503 switch (type()) { |
1504 case evol_method: | |
1505 witness = check_evol_method(method_argument(0)); | |
1506 break; | |
1507 case leaf_type: | |
1508 witness = check_leaf_type(context_type()); | |
1509 break; | |
1510 case abstract_with_unique_concrete_subtype: | |
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1511 witness = check_abstract_with_unique_concrete_subtype(context_type(), type_argument(1), changes); |
0 | 1512 break; |
1513 case abstract_with_no_concrete_subtype: | |
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1514 witness = check_abstract_with_no_concrete_subtype(context_type(), changes); |
0 | 1515 break; |
1516 case concrete_with_no_concrete_subtype: | |
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1517 witness = check_concrete_with_no_concrete_subtype(context_type(), changes); |
0 | 1518 break; |
1519 case unique_concrete_method: | |
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1520 witness = check_unique_concrete_method(context_type(), method_argument(1), changes); |
0 | 1521 break; |
1522 case abstract_with_exclusive_concrete_subtypes_2: | |
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1523 witness = check_abstract_with_exclusive_concrete_subtypes(context_type(), type_argument(1), type_argument(2), changes); |
0 | 1524 break; |
1525 case exclusive_concrete_methods_2: | |
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1526 witness = check_exclusive_concrete_methods(context_type(), method_argument(1), method_argument(2), changes); |
0 | 1527 break; |
1528 case no_finalizable_subclasses: | |
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1529 witness = check_has_no_finalizable_subclasses(context_type(), changes); |
0 | 1530 break; |
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1531 default: |
0 | 1532 witness = NULL; |
1533 break; | |
1534 } | |
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1535 trace_and_log_witness(witness); |
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1536 return witness; |
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1537 } |
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1538 |
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1539 |
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1540 Klass* Dependencies::DepStream::check_call_site_dependency(CallSiteDepChange* changes) { |
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1541 assert_locked_or_safepoint(Compile_lock); |
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1542 Dependencies::check_valid_dependency_type(type()); |
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1543 |
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1544 Klass* witness = NULL; |
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1545 switch (type()) { |
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1546 case call_site_target_value: |
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1547 witness = check_call_site_target_value(argument_oop(0), argument_oop(1), changes); |
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1548 break; |
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1549 default: |
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1550 witness = NULL; |
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1551 break; |
0 | 1552 } |
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1553 trace_and_log_witness(witness); |
0 | 1554 return witness; |
1555 } | |
1556 | |
1557 | |
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1558 Klass* Dependencies::DepStream::spot_check_dependency_at(DepChange& changes) { |
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1559 // Handle klass dependency |
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1560 if (changes.is_klass_change() && changes.as_klass_change()->involves_context(context_type())) |
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1561 return check_klass_dependency(changes.as_klass_change()); |
0 | 1562 |
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1563 // Handle CallSite dependency |
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1564 if (changes.is_call_site_change()) |
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1565 return check_call_site_dependency(changes.as_call_site_change()); |
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1566 |
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1567 // irrelevant dependency; skip it |
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1568 return NULL; |
0 | 1569 } |
1570 | |
1571 | |
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1572 void DepChange::print() { |
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1573 int nsup = 0, nint = 0; |
0 | 1574 for (ContextStream str(*this); str.next(); ) { |
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1575 Klass* k = str.klass(); |
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1576 switch (str.change_type()) { |
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1577 case Change_new_type: |
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1578 tty->print_cr(" dependee = %s", InstanceKlass::cast(k)->external_name()); |
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1579 break; |
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1580 case Change_new_sub: |
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1581 if (!WizardMode) { |
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1582 ++nsup; |
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1583 } else { |
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1584 tty->print_cr(" context super = %s", InstanceKlass::cast(k)->external_name()); |
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|
1585 } |
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1586 break; |
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1587 case Change_new_impl: |
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1588 if (!WizardMode) { |
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1589 ++nint; |
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1590 } else { |
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1591 tty->print_cr(" context interface = %s", InstanceKlass::cast(k)->external_name()); |
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|
1592 } |
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|
1593 break; |
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|
1594 } |
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|
1595 } |
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1596 if (nsup + nint != 0) { |
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1597 tty->print_cr(" context supers = %d, interfaces = %d", nsup, nint); |
0 | 1598 } |
1599 } | |
1600 | |
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1601 void DepChange::ContextStream::start() { |
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1602 Klass* new_type = _changes.is_klass_change() ? _changes.as_klass_change()->new_type() : (Klass*) NULL; |
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1603 _change_type = (new_type == NULL ? NO_CHANGE : Start_Klass); |
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1604 _klass = new_type; |
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1605 _ti_base = NULL; |
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1606 _ti_index = 0; |
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1607 _ti_limit = 0; |
0 | 1608 } |
1609 | |
1610 bool DepChange::ContextStream::next() { | |
1611 switch (_change_type) { | |
1612 case Start_Klass: // initial state; _klass is the new type | |
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1613 _ti_base = InstanceKlass::cast(_klass)->transitive_interfaces(); |
0 | 1614 _ti_index = 0; |
1615 _change_type = Change_new_type; | |
1616 return true; | |
1617 case Change_new_type: | |
1618 // fall through: | |
1619 _change_type = Change_new_sub; | |
1620 case Change_new_sub: | |
54
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1621 // 6598190: brackets workaround Sun Studio C++ compiler bug 6629277 |
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1622 { |
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1623 _klass = InstanceKlass::cast(_klass)->super(); |
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1624 if (_klass != NULL) { |
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1625 return true; |
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1626 } |
0 | 1627 } |
1628 // else set up _ti_limit and fall through: | |
1629 _ti_limit = (_ti_base == NULL) ? 0 : _ti_base->length(); | |
1630 _change_type = Change_new_impl; | |
1631 case Change_new_impl: | |
1632 if (_ti_index < _ti_limit) { | |
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1633 _klass = _ti_base->at(_ti_index++); |
0 | 1634 return true; |
1635 } | |
1636 // fall through: | |
1637 _change_type = NO_CHANGE; // iterator is exhausted | |
1638 case NO_CHANGE: | |
1639 break; | |
1640 default: | |
1641 ShouldNotReachHere(); | |
1642 } | |
1643 return false; | |
1644 } | |
1645 | |
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1646 void KlassDepChange::initialize() { |
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1647 // entire transaction must be under this lock: |
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1648 assert_lock_strong(Compile_lock); |
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1649 |
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1650 // Mark all dependee and all its superclasses |
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1651 // Mark transitive interfaces |
0 | 1652 for (ContextStream str(*this); str.next(); ) { |
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1653 Klass* d = str.klass(); |
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1654 assert(!InstanceKlass::cast(d)->is_marked_dependent(), "checking"); |
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1655 InstanceKlass::cast(d)->set_is_marked_dependent(true); |
0 | 1656 } |
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1657 } |
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1658 |
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1659 KlassDepChange::~KlassDepChange() { |
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1660 // Unmark all dependee and all its superclasses |
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1661 // Unmark transitive interfaces |
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1662 for (ContextStream str(*this); str.next(); ) { |
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1663 Klass* d = str.klass(); |
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1664 InstanceKlass::cast(d)->set_is_marked_dependent(false); |
0 | 1665 } |
1666 } | |
1667 | |
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1668 bool KlassDepChange::involves_context(Klass* k) { |
6983 | 1669 if (k == NULL || !k->oop_is_instance()) { |
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1670 return false; |
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1671 } |
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1672 InstanceKlass* ik = InstanceKlass::cast(k); |
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1673 bool is_contained = ik->is_marked_dependent(); |
6983 | 1674 assert(is_contained == new_type()->is_subtype_of(k), |
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1675 "correct marking of potential context types"); |
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1676 return is_contained; |
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1677 } |
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1678 |
0 | 1679 #ifndef PRODUCT |
1680 void Dependencies::print_statistics() { | |
1681 if (deps_find_witness_print != 0) { | |
1682 // Call one final time, to flush out the data. | |
1683 deps_find_witness_print = -1; | |
1684 count_find_witness_calls(); | |
1685 } | |
1686 } | |
1687 #endif |