Mercurial > hg > graal-jvmci-8
annotate src/share/vm/code/dependencies.hpp @ 14505:524b54a7f1b5
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Summary: Provide fast lookup of checked dependencies via hashmap
Reviewed-by: kvn, roland
author | anoll |
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date | Wed, 26 Feb 2014 11:29:47 +0100 |
parents | 3aaa4b9966f6 |
children | d8041d695d19 3c6ae9109a86 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2012, 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 #ifndef SHARE_VM_CODE_DEPENDENCIES_HPP |
26 #define SHARE_VM_CODE_DEPENDENCIES_HPP | |
27 | |
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28 #include "ci/ciCallSite.hpp" |
1972 | 29 #include "ci/ciKlass.hpp" |
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30 #include "ci/ciMethodHandle.hpp" |
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31 #include "classfile/systemDictionary.hpp" |
1972 | 32 #include "code/compressedStream.hpp" |
33 #include "code/nmethod.hpp" | |
34 #include "utilities/growableArray.hpp" | |
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35 #include "utilities/hashtable.hpp" |
1972 | 36 |
0 | 37 //** Dependencies represent assertions (approximate invariants) within |
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38 // the runtime system, e.g. class hierarchy changes. An example is an |
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39 // assertion that a given method is not overridden; another example is |
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40 // that a type has only one concrete subtype. Compiled code which |
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41 // relies on such assertions must be discarded if they are overturned |
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42 // by changes in the runtime system. We can think of these assertions |
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43 // as approximate invariants, because we expect them to be overturned |
0 | 44 // very infrequently. We are willing to perform expensive recovery |
45 // operations when they are overturned. The benefit, of course, is | |
46 // performing optimistic optimizations (!) on the object code. | |
47 // | |
48 // Changes in the class hierarchy due to dynamic linking or | |
49 // class evolution can violate dependencies. There is enough | |
50 // indexing between classes and nmethods to make dependency | |
51 // checking reasonably efficient. | |
52 | |
53 class ciEnv; | |
54 class nmethod; | |
55 class OopRecorder; | |
56 class xmlStream; | |
57 class CompileLog; | |
58 class DepChange; | |
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59 class KlassDepChange; |
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60 class CallSiteDepChange; |
0 | 61 class No_Safepoint_Verifier; |
62 | |
63 class Dependencies: public ResourceObj { | |
64 public: | |
65 // Note: In the comments on dependency types, most uses of the terms | |
66 // subtype and supertype are used in a "non-strict" or "inclusive" | |
67 // sense, and are starred to remind the reader of this fact. | |
68 // Strict uses of the terms use the word "proper". | |
69 // | |
70 // Specifically, every class is its own subtype* and supertype*. | |
71 // (This trick is easier than continually saying things like "Y is a | |
72 // subtype of X or X itself".) | |
73 // | |
74 // Sometimes we write X > Y to mean X is a proper supertype of Y. | |
75 // The notation X > {Y, Z} means X has proper subtypes Y, Z. | |
76 // The notation X.m > Y means that Y inherits m from X, while | |
77 // X.m > Y.m means Y overrides X.m. A star denotes abstractness, | |
78 // as *I > A, meaning (abstract) interface I is a super type of A, | |
79 // or A.*m > B.m, meaning B.m implements abstract method A.m. | |
80 // | |
81 // In this module, the terms "subtype" and "supertype" refer to | |
82 // Java-level reference type conversions, as detected by | |
83 // "instanceof" and performed by "checkcast" operations. The method | |
84 // Klass::is_subtype_of tests these relations. Note that "subtype" | |
85 // is richer than "subclass" (as tested by Klass::is_subclass_of), | |
86 // since it takes account of relations involving interface and array | |
87 // types. | |
88 // | |
89 // To avoid needless complexity, dependencies involving array types | |
90 // are not accepted. If you need to make an assertion about an | |
91 // array type, make the assertion about its corresponding element | |
92 // types. Any assertion that might change about an array type can | |
93 // be converted to an assertion about its element type. | |
94 // | |
95 // Most dependencies are evaluated over a "context type" CX, which | |
96 // stands for the set Subtypes(CX) of every Java type that is a subtype* | |
97 // of CX. When the system loads a new class or interface N, it is | |
98 // responsible for re-evaluating changed dependencies whose context | |
99 // type now includes N, that is, all super types of N. | |
100 // | |
101 enum DepType { | |
102 end_marker = 0, | |
103 | |
104 // An 'evol' dependency simply notes that the contents of the | |
105 // method were used. If it evolves (is replaced), the nmethod | |
106 // must be recompiled. No other dependencies are implied. | |
107 evol_method, | |
108 FIRST_TYPE = evol_method, | |
109 | |
110 // A context type CX is a leaf it if has no proper subtype. | |
111 leaf_type, | |
112 | |
113 // An abstract class CX has exactly one concrete subtype CC. | |
114 abstract_with_unique_concrete_subtype, | |
115 | |
116 // The type CX is purely abstract, with no concrete subtype* at all. | |
117 abstract_with_no_concrete_subtype, | |
118 | |
119 // The concrete CX is free of concrete proper subtypes. | |
120 concrete_with_no_concrete_subtype, | |
121 | |
122 // Given a method M1 and a context class CX, the set MM(CX, M1) of | |
123 // "concrete matching methods" in CX of M1 is the set of every | |
124 // concrete M2 for which it is possible to create an invokevirtual | |
125 // or invokeinterface call site that can reach either M1 or M2. | |
126 // That is, M1 and M2 share a name, signature, and vtable index. | |
127 // We wish to notice when the set MM(CX, M1) is just {M1}, or | |
128 // perhaps a set of two {M1,M2}, and issue dependencies on this. | |
129 | |
130 // The set MM(CX, M1) can be computed by starting with any matching | |
131 // concrete M2 that is inherited into CX, and then walking the | |
132 // subtypes* of CX looking for concrete definitions. | |
133 | |
134 // The parameters to this dependency are the method M1 and the | |
135 // context class CX. M1 must be either inherited in CX or defined | |
136 // in a subtype* of CX. It asserts that MM(CX, M1) is no greater | |
137 // than {M1}. | |
138 unique_concrete_method, // one unique concrete method under CX | |
139 | |
140 // An "exclusive" assertion concerns two methods or subtypes, and | |
141 // declares that there are at most two (or perhaps later N>2) | |
142 // specific items that jointly satisfy the restriction. | |
143 // We list all items explicitly rather than just giving their | |
144 // count, for robustness in the face of complex schema changes. | |
145 | |
146 // A context class CX (which may be either abstract or concrete) | |
147 // has two exclusive concrete subtypes* C1, C2 if every concrete | |
148 // subtype* of CX is either C1 or C2. Note that if neither C1 or C2 | |
149 // are equal to CX, then CX itself must be abstract. But it is | |
150 // also possible (for example) that C1 is CX (a concrete class) | |
151 // and C2 is a proper subtype of C1. | |
152 abstract_with_exclusive_concrete_subtypes_2, | |
153 | |
154 // This dependency asserts that MM(CX, M1) is no greater than {M1,M2}. | |
155 exclusive_concrete_methods_2, | |
156 | |
157 // This dependency asserts that no instances of class or it's | |
158 // subclasses require finalization registration. | |
159 no_finalizable_subclasses, | |
160 | |
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161 // This dependency asserts when the CallSite.target value changed. |
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162 call_site_target_value, |
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163 |
0 | 164 TYPE_LIMIT |
165 }; | |
166 enum { | |
167 LG2_TYPE_LIMIT = 4, // assert(TYPE_LIMIT <= (1<<LG2_TYPE_LIMIT)) | |
168 | |
169 // handy categorizations of dependency types: | |
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170 all_types = ((1 << TYPE_LIMIT) - 1) & ((-1) << FIRST_TYPE), |
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171 |
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172 non_klass_types = (1 << call_site_target_value), |
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173 klass_types = all_types & ~non_klass_types, |
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174 |
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175 non_ctxk_types = (1 << evol_method), |
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176 implicit_ctxk_types = (1 << call_site_target_value), |
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177 explicit_ctxk_types = all_types & ~(non_ctxk_types | implicit_ctxk_types), |
0 | 178 |
179 max_arg_count = 3, // current maximum number of arguments (incl. ctxk) | |
180 | |
181 // A "context type" is a class or interface that | |
182 // provides context for evaluating a dependency. | |
183 // When present, it is one of the arguments (dep_context_arg). | |
184 // | |
185 // If a dependency does not have a context type, there is a | |
186 // default context, depending on the type of the dependency. | |
187 // This bit signals that a default context has been compressed away. | |
188 default_context_type_bit = (1<<LG2_TYPE_LIMIT) | |
189 }; | |
190 | |
191 static const char* dep_name(DepType dept); | |
192 static int dep_args(DepType dept); | |
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193 |
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194 static bool is_klass_type( DepType dept) { return dept_in_mask(dept, klass_types ); } |
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195 |
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196 static bool has_explicit_context_arg(DepType dept) { return dept_in_mask(dept, explicit_ctxk_types); } |
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197 static bool has_implicit_context_arg(DepType dept) { return dept_in_mask(dept, implicit_ctxk_types); } |
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198 |
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199 static int dep_context_arg(DepType dept) { return has_explicit_context_arg(dept) ? 0 : -1; } |
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200 static int dep_implicit_context_arg(DepType dept) { return has_implicit_context_arg(dept) ? 0 : -1; } |
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201 |
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202 static void check_valid_dependency_type(DepType dept); |
0 | 203 |
204 private: | |
205 // State for writing a new set of dependencies: | |
206 GrowableArray<int>* _dep_seen; // (seen[h->ident] & (1<<dept)) | |
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207 GrowableArray<ciBaseObject*>* _deps[TYPE_LIMIT]; |
0 | 208 |
209 static const char* _dep_name[TYPE_LIMIT]; | |
210 static int _dep_args[TYPE_LIMIT]; | |
211 | |
212 static bool dept_in_mask(DepType dept, int mask) { | |
213 return (int)dept >= 0 && dept < TYPE_LIMIT && ((1<<dept) & mask) != 0; | |
214 } | |
215 | |
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216 bool note_dep_seen(int dept, ciBaseObject* x) { |
0 | 217 assert(dept < BitsPerInt, "oob"); |
218 int x_id = x->ident(); | |
219 assert(_dep_seen != NULL, "deps must be writable"); | |
220 int seen = _dep_seen->at_grow(x_id, 0); | |
221 _dep_seen->at_put(x_id, seen | (1<<dept)); | |
222 // return true if we've already seen dept/x | |
223 return (seen & (1<<dept)) != 0; | |
224 } | |
225 | |
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226 bool maybe_merge_ctxk(GrowableArray<ciBaseObject*>* deps, |
0 | 227 int ctxk_i, ciKlass* ctxk); |
228 | |
229 void sort_all_deps(); | |
230 size_t estimate_size_in_bytes(); | |
231 | |
232 // Initialize _deps, etc. | |
233 void initialize(ciEnv* env); | |
234 | |
235 // State for making a new set of dependencies: | |
236 OopRecorder* _oop_recorder; | |
237 | |
238 // Logging support | |
239 CompileLog* _log; | |
240 | |
241 address _content_bytes; // everything but the oop references, encoded | |
242 size_t _size_in_bytes; | |
243 | |
244 public: | |
245 // Make a new empty dependencies set. | |
246 Dependencies(ciEnv* env) { | |
247 initialize(env); | |
248 } | |
249 | |
250 private: | |
251 // Check for a valid context type. | |
252 // Enforce the restriction against array types. | |
253 static void check_ctxk(ciKlass* ctxk) { | |
254 assert(ctxk->is_instance_klass(), "java types only"); | |
255 } | |
256 static void check_ctxk_concrete(ciKlass* ctxk) { | |
257 assert(is_concrete_klass(ctxk->as_instance_klass()), "must be concrete"); | |
258 } | |
259 static void check_ctxk_abstract(ciKlass* ctxk) { | |
260 check_ctxk(ctxk); | |
261 assert(!is_concrete_klass(ctxk->as_instance_klass()), "must be abstract"); | |
262 } | |
263 | |
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264 void assert_common_1(DepType dept, ciBaseObject* x); |
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265 void assert_common_2(DepType dept, ciBaseObject* x0, ciBaseObject* x1); |
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266 void assert_common_3(DepType dept, ciKlass* ctxk, ciBaseObject* x1, ciBaseObject* x2); |
0 | 267 |
268 public: | |
269 // Adding assertions to a new dependency set at compile time: | |
270 void assert_evol_method(ciMethod* m); | |
271 void assert_leaf_type(ciKlass* ctxk); | |
272 void assert_abstract_with_unique_concrete_subtype(ciKlass* ctxk, ciKlass* conck); | |
273 void assert_abstract_with_no_concrete_subtype(ciKlass* ctxk); | |
274 void assert_concrete_with_no_concrete_subtype(ciKlass* ctxk); | |
275 void assert_unique_concrete_method(ciKlass* ctxk, ciMethod* uniqm); | |
276 void assert_abstract_with_exclusive_concrete_subtypes(ciKlass* ctxk, ciKlass* k1, ciKlass* k2); | |
277 void assert_exclusive_concrete_methods(ciKlass* ctxk, ciMethod* m1, ciMethod* m2); | |
278 void assert_has_no_finalizable_subclasses(ciKlass* ctxk); | |
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279 void assert_call_site_target_value(ciCallSite* call_site, ciMethodHandle* method_handle); |
0 | 280 |
281 // Define whether a given method or type is concrete. | |
282 // These methods define the term "concrete" as used in this module. | |
283 // For this module, an "abstract" class is one which is non-concrete. | |
284 // | |
285 // Future optimizations may allow some classes to remain | |
286 // non-concrete until their first instantiation, and allow some | |
287 // methods to remain non-concrete until their first invocation. | |
288 // In that case, there would be a middle ground between concrete | |
289 // and abstract (as defined by the Java language and VM). | |
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290 static bool is_concrete_klass(Klass* k); // k is instantiable |
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291 static bool is_concrete_method(Method* m); // m is invocable |
0 | 292 static Klass* find_finalizable_subclass(Klass* k); |
293 | |
294 // These versions of the concreteness queries work through the CI. | |
295 // The CI versions are allowed to skew sometimes from the VM | |
296 // (oop-based) versions. The cost of such a difference is a | |
297 // (safely) aborted compilation, or a deoptimization, or a missed | |
298 // optimization opportunity. | |
299 // | |
300 // In order to prevent spurious assertions, query results must | |
301 // remain stable within any single ciEnv instance. (I.e., they must | |
302 // not go back into the VM to get their value; they must cache the | |
303 // bit in the CI, either eagerly or lazily.) | |
304 static bool is_concrete_klass(ciInstanceKlass* k); // k appears instantiable | |
305 static bool is_concrete_method(ciMethod* m); // m appears invocable | |
306 static bool has_finalizable_subclass(ciInstanceKlass* k); | |
307 | |
308 // As a general rule, it is OK to compile under the assumption that | |
309 // a given type or method is concrete, even if it at some future | |
310 // point becomes abstract. So dependency checking is one-sided, in | |
311 // that it permits supposedly concrete classes or methods to turn up | |
312 // as really abstract. (This shouldn't happen, except during class | |
313 // evolution, but that's the logic of the checking.) However, if a | |
314 // supposedly abstract class or method suddenly becomes concrete, a | |
315 // dependency on it must fail. | |
316 | |
317 // Checking old assertions at run-time (in the VM only): | |
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318 static Klass* check_evol_method(Method* m); |
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319 static Klass* check_leaf_type(Klass* ctxk); |
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320 static Klass* check_abstract_with_unique_concrete_subtype(Klass* ctxk, Klass* conck, |
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321 KlassDepChange* changes = NULL); |
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322 static Klass* check_abstract_with_no_concrete_subtype(Klass* ctxk, |
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323 KlassDepChange* changes = NULL); |
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324 static Klass* check_concrete_with_no_concrete_subtype(Klass* ctxk, |
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325 KlassDepChange* changes = NULL); |
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326 static Klass* check_unique_concrete_method(Klass* ctxk, Method* uniqm, |
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327 KlassDepChange* changes = NULL); |
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328 static Klass* check_abstract_with_exclusive_concrete_subtypes(Klass* ctxk, Klass* k1, Klass* k2, |
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329 KlassDepChange* changes = NULL); |
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330 static Klass* check_exclusive_concrete_methods(Klass* ctxk, Method* m1, Method* m2, |
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331 KlassDepChange* changes = NULL); |
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332 static Klass* check_has_no_finalizable_subclasses(Klass* ctxk, KlassDepChange* changes = NULL); |
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333 static Klass* check_call_site_target_value(oop call_site, oop method_handle, CallSiteDepChange* changes = NULL); |
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334 // A returned Klass* is NULL if the dependency assertion is still |
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335 // valid. A non-NULL Klass* is a 'witness' to the assertion |
0 | 336 // failure, a point in the class hierarchy where the assertion has |
337 // been proven false. For example, if check_leaf_type returns | |
338 // non-NULL, the value is a subtype of the supposed leaf type. This | |
339 // witness value may be useful for logging the dependency failure. | |
340 // Note that, when a dependency fails, there may be several possible | |
341 // witnesses to the failure. The value returned from the check_foo | |
342 // method is chosen arbitrarily. | |
343 | |
344 // The 'changes' value, if non-null, requests a limited spot-check | |
345 // near the indicated recent changes in the class hierarchy. | |
346 // It is used by DepStream::spot_check_dependency_at. | |
347 | |
348 // Detecting possible new assertions: | |
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349 static Klass* find_unique_concrete_subtype(Klass* ctxk); |
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350 static Method* find_unique_concrete_method(Klass* ctxk, Method* m); |
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351 static int find_exclusive_concrete_subtypes(Klass* ctxk, int klen, Klass* k[]); |
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352 static int find_exclusive_concrete_methods(Klass* ctxk, int mlen, Method* m[]); |
0 | 353 |
354 // Create the encoding which will be stored in an nmethod. | |
355 void encode_content_bytes(); | |
356 | |
357 address content_bytes() { | |
358 assert(_content_bytes != NULL, "encode it first"); | |
359 return _content_bytes; | |
360 } | |
361 size_t size_in_bytes() { | |
362 assert(_content_bytes != NULL, "encode it first"); | |
363 return _size_in_bytes; | |
364 } | |
365 | |
366 OopRecorder* oop_recorder() { return _oop_recorder; } | |
367 CompileLog* log() { return _log; } | |
368 | |
369 void copy_to(nmethod* nm); | |
370 | |
371 void log_all_dependencies(); | |
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372 void log_dependency(DepType dept, int nargs, ciBaseObject* args[]) { |
0 | 373 write_dependency_to(log(), dept, nargs, args); |
374 } | |
375 void log_dependency(DepType dept, | |
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376 ciBaseObject* x0, |
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377 ciBaseObject* x1 = NULL, |
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378 ciBaseObject* x2 = NULL) { |
0 | 379 if (log() == NULL) return; |
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380 ciBaseObject* args[max_arg_count]; |
0 | 381 args[0] = x0; |
382 args[1] = x1; | |
383 args[2] = x2; | |
384 assert(2 < max_arg_count, ""); | |
385 log_dependency(dept, dep_args(dept), args); | |
386 } | |
387 | |
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388 class DepArgument : public ResourceObj { |
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389 private: |
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390 bool _is_oop; |
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391 bool _valid; |
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392 void* _value; |
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393 public: |
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394 DepArgument() : _is_oop(false), _value(NULL), _valid(false) {} |
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395 DepArgument(oop v): _is_oop(true), _value(v), _valid(true) {} |
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396 DepArgument(Metadata* v): _is_oop(false), _value(v), _valid(true) {} |
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397 |
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398 bool is_null() const { return _value == NULL; } |
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399 bool is_oop() const { return _is_oop; } |
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400 bool is_metadata() const { return !_is_oop; } |
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401 bool is_klass() const { return is_metadata() && metadata_value()->is_klass(); } |
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402 bool is_method() const { return is_metadata() && metadata_value()->is_method(); } |
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403 |
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404 oop oop_value() const { assert(_is_oop && _valid, "must be"); return (oop) _value; } |
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405 Metadata* metadata_value() const { assert(!_is_oop && _valid, "must be"); return (Metadata*) _value; } |
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406 }; |
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407 |
0 | 408 static void write_dependency_to(CompileLog* log, |
409 DepType dept, | |
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410 int nargs, ciBaseObject* args[], |
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411 Klass* witness = NULL); |
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412 static void write_dependency_to(CompileLog* log, |
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413 DepType dept, |
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414 int nargs, DepArgument args[], |
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415 Klass* witness = NULL); |
0 | 416 static void write_dependency_to(xmlStream* xtty, |
417 DepType dept, | |
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418 int nargs, DepArgument args[], |
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419 Klass* witness = NULL); |
0 | 420 static void print_dependency(DepType dept, |
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421 int nargs, DepArgument args[], |
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422 Klass* witness = NULL); |
0 | 423 |
424 private: | |
425 // helper for encoding common context types as zero: | |
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426 static ciKlass* ctxk_encoded_as_null(DepType dept, ciBaseObject* x); |
0 | 427 |
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428 static Klass* ctxk_encoded_as_null(DepType dept, Metadata* x); |
0 | 429 |
430 public: | |
431 // Use this to iterate over an nmethod's dependency set. | |
432 // Works on new and old dependency sets. | |
433 // Usage: | |
434 // | |
435 // ; | |
436 // Dependencies::DepType dept; | |
437 // for (Dependencies::DepStream deps(nm); deps.next(); ) { | |
438 // ... | |
439 // } | |
440 // | |
441 // The caller must be in the VM, since oops are not wrapped in handles. | |
442 class DepStream { | |
443 private: | |
444 nmethod* _code; // null if in a compiler thread | |
445 Dependencies* _deps; // null if not in a compiler thread | |
446 CompressedReadStream _bytes; | |
447 #ifdef ASSERT | |
448 size_t _byte_limit; | |
449 #endif | |
450 | |
451 // iteration variables: | |
452 DepType _type; | |
453 int _xi[max_arg_count+1]; | |
454 | |
455 void initial_asserts(size_t byte_limit) NOT_DEBUG({}); | |
456 | |
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457 inline Metadata* recorded_metadata_at(int i); |
0 | 458 inline oop recorded_oop_at(int i); |
459 | |
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460 Klass* check_klass_dependency(KlassDepChange* changes); |
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461 Klass* check_call_site_dependency(CallSiteDepChange* changes); |
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462 |
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463 void trace_and_log_witness(Klass* witness); |
0 | 464 |
465 public: | |
466 DepStream(Dependencies* deps) | |
467 : _deps(deps), | |
468 _code(NULL), | |
469 _bytes(deps->content_bytes()) | |
470 { | |
471 initial_asserts(deps->size_in_bytes()); | |
472 } | |
473 DepStream(nmethod* code) | |
474 : _deps(NULL), | |
475 _code(code), | |
476 _bytes(code->dependencies_begin()) | |
477 { | |
478 initial_asserts(code->dependencies_size()); | |
479 } | |
480 | |
481 bool next(); | |
482 | |
483 DepType type() { return _type; } | |
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484 bool has_oop_argument() { return type() == call_site_target_value; } |
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485 uintptr_t get_identifier(int i); |
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486 |
0 | 487 int argument_count() { return dep_args(type()); } |
488 int argument_index(int i) { assert(0 <= i && i < argument_count(), "oob"); | |
489 return _xi[i]; } | |
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490 Metadata* argument(int i); // => recorded_oop_at(argument_index(i)) |
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491 oop argument_oop(int i); // => recorded_oop_at(argument_index(i)) |
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492 Klass* context_type(); |
0 | 493 |
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494 bool is_klass_type() { return Dependencies::is_klass_type(type()); } |
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495 |
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496 Method* method_argument(int i) { |
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497 Metadata* x = argument(i); |
0 | 498 assert(x->is_method(), "type"); |
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499 return (Method*) x; |
0 | 500 } |
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501 Klass* type_argument(int i) { |
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502 Metadata* x = argument(i); |
0 | 503 assert(x->is_klass(), "type"); |
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504 return (Klass*) x; |
0 | 505 } |
506 | |
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507 // The point of the whole exercise: Is this dep still OK? |
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508 Klass* check_dependency() { |
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509 Klass* result = check_klass_dependency(NULL); |
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510 if (result != NULL) return result; |
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511 return check_call_site_dependency(NULL); |
0 | 512 } |
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513 |
0 | 514 // A lighter version: Checks only around recent changes in a class |
515 // hierarchy. (See Universe::flush_dependents_on.) | |
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516 Klass* spot_check_dependency_at(DepChange& changes); |
0 | 517 |
518 // Log the current dependency to xtty or compilation log. | |
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519 void log_dependency(Klass* witness = NULL); |
0 | 520 |
521 // Print the current dependency to tty. | |
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522 void print_dependency(Klass* witness = NULL, bool verbose = false); |
0 | 523 }; |
524 friend class Dependencies::DepStream; | |
525 | |
526 static void print_statistics() PRODUCT_RETURN; | |
527 }; | |
528 | |
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529 |
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530 class DependencySignature : public GenericHashtableEntry<DependencySignature, ResourceObj> { |
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531 private: |
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532 int _args_count; |
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533 uintptr_t _argument_hash[Dependencies::max_arg_count]; |
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534 Dependencies::DepType _type; |
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535 |
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536 public: |
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537 DependencySignature(Dependencies::DepStream& dep) { |
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538 _args_count = dep.argument_count(); |
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539 _type = dep.type(); |
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540 for (int i = 0; i < _args_count; i++) { |
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541 _argument_hash[i] = dep.get_identifier(i); |
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542 } |
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543 } |
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544 |
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545 bool equals(DependencySignature* sig) const; |
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546 uintptr_t key() const { return _argument_hash[0] >> 2; } |
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547 |
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548 int args_count() const { return _args_count; } |
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549 uintptr_t arg(int idx) const { return _argument_hash[idx]; } |
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550 Dependencies::DepType type() const { return _type; } |
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551 }; |
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552 |
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553 |
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554 // Every particular DepChange is a sub-class of this class. |
0 | 555 class DepChange : public StackObj { |
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556 public: |
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557 // What kind of DepChange is this? |
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558 virtual bool is_klass_change() const { return false; } |
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559 virtual bool is_call_site_change() const { return false; } |
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560 |
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561 // Subclass casting with assertions. |
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562 KlassDepChange* as_klass_change() { |
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563 assert(is_klass_change(), "bad cast"); |
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564 return (KlassDepChange*) this; |
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565 } |
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566 CallSiteDepChange* as_call_site_change() { |
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567 assert(is_call_site_change(), "bad cast"); |
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568 return (CallSiteDepChange*) this; |
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569 } |
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570 |
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571 void print(); |
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572 |
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573 public: |
0 | 574 enum ChangeType { |
575 NO_CHANGE = 0, // an uninvolved klass | |
576 Change_new_type, // a newly loaded type | |
577 Change_new_sub, // a super with a new subtype | |
578 Change_new_impl, // an interface with a new implementation | |
579 CHANGE_LIMIT, | |
580 Start_Klass = CHANGE_LIMIT // internal indicator for ContextStream | |
581 }; | |
582 | |
583 // Usage: | |
584 // for (DepChange::ContextStream str(changes); str.next(); ) { | |
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585 // Klass* k = str.klass(); |
0 | 586 // switch (str.change_type()) { |
587 // ... | |
588 // } | |
589 // } | |
590 class ContextStream : public StackObj { | |
591 private: | |
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592 DepChange& _changes; |
0 | 593 friend class DepChange; |
594 | |
595 // iteration variables: | |
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596 ChangeType _change_type; |
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597 Klass* _klass; |
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598 Array<Klass*>* _ti_base; // i.e., transitive_interfaces |
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599 int _ti_index; |
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600 int _ti_limit; |
0 | 601 |
602 // start at the beginning: | |
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603 void start(); |
0 | 604 |
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605 public: |
0 | 606 ContextStream(DepChange& changes) |
607 : _changes(changes) | |
608 { start(); } | |
609 | |
610 ContextStream(DepChange& changes, No_Safepoint_Verifier& nsv) | |
611 : _changes(changes) | |
612 // the nsv argument makes it safe to hold oops like _klass | |
613 { start(); } | |
614 | |
615 bool next(); | |
616 | |
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617 ChangeType change_type() { return _change_type; } |
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618 Klass* klass() { return _klass; } |
0 | 619 }; |
620 friend class DepChange::ContextStream; | |
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621 }; |
0 | 622 |
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623 |
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624 // A class hierarchy change coming through the VM (under the Compile_lock). |
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625 // The change is structured as a single new type with any number of supers |
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626 // and implemented interface types. Other than the new type, any of the |
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627 // super types can be context types for a relevant dependency, which the |
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628 // new type could invalidate. |
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629 class KlassDepChange : public DepChange { |
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630 private: |
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631 // each change set is rooted in exactly one new type (at present): |
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632 KlassHandle _new_type; |
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633 |
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634 void initialize(); |
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635 |
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636 public: |
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637 // notes the new type, marks it and all its super-types |
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638 KlassDepChange(KlassHandle new_type) |
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639 : _new_type(new_type) |
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640 { |
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641 initialize(); |
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642 } |
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643 |
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644 // cleans up the marks |
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645 ~KlassDepChange(); |
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646 |
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647 // What kind of DepChange is this? |
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648 virtual bool is_klass_change() const { return true; } |
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649 |
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650 Klass* new_type() { return _new_type(); } |
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651 |
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652 // involves_context(k) is true if k is new_type or any of the super types |
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653 bool involves_context(Klass* k); |
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654 }; |
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655 |
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656 |
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657 // A CallSite has changed its target. |
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658 class CallSiteDepChange : public DepChange { |
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659 private: |
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660 Handle _call_site; |
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661 Handle _method_handle; |
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662 |
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663 public: |
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664 CallSiteDepChange(Handle call_site, Handle method_handle) |
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665 : _call_site(call_site), |
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666 _method_handle(method_handle) |
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667 { |
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668 assert(_call_site() ->is_a(SystemDictionary::CallSite_klass()), "must be"); |
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669 assert(_method_handle()->is_a(SystemDictionary::MethodHandle_klass()), "must be"); |
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670 } |
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671 |
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672 // What kind of DepChange is this? |
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673 virtual bool is_call_site_change() const { return true; } |
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674 |
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675 oop call_site() const { return _call_site(); } |
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676 oop method_handle() const { return _method_handle(); } |
0 | 677 }; |
1972 | 678 |
679 #endif // SHARE_VM_CODE_DEPENDENCIES_HPP |