Mercurial > hg > truffle
annotate src/share/vm/code/dependencies.hpp @ 11516:20b642493616
CR-1368
author | Mick Jordan <mick.jordan@oracle.com> |
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date | Tue, 03 Sep 2013 14:09:35 -0700 |
parents | 2979aaac95af |
children | d8041d695d19 |
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" | |
35 | |
0 | 36 //** Dependencies represent assertions (approximate invariants) within |
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37 // the runtime system, e.g. class hierarchy changes. An example is an |
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38 // assertion that a given method is not overridden; another example is |
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39 // that a type has only one concrete subtype. Compiled code which |
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40 // relies on such assertions must be discarded if they are overturned |
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41 // by changes in the runtime system. We can think of these assertions |
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42 // as approximate invariants, because we expect them to be overturned |
0 | 43 // very infrequently. We are willing to perform expensive recovery |
44 // operations when they are overturned. The benefit, of course, is | |
45 // performing optimistic optimizations (!) on the object code. | |
46 // | |
47 // Changes in the class hierarchy due to dynamic linking or | |
48 // class evolution can violate dependencies. There is enough | |
49 // indexing between classes and nmethods to make dependency | |
50 // checking reasonably efficient. | |
51 | |
52 class ciEnv; | |
53 class nmethod; | |
54 class OopRecorder; | |
55 class xmlStream; | |
56 class CompileLog; | |
57 class DepChange; | |
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58 class KlassDepChange; |
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59 class CallSiteDepChange; |
0 | 60 class No_Safepoint_Verifier; |
61 | |
62 class Dependencies: public ResourceObj { | |
63 public: | |
64 // Note: In the comments on dependency types, most uses of the terms | |
65 // subtype and supertype are used in a "non-strict" or "inclusive" | |
66 // sense, and are starred to remind the reader of this fact. | |
67 // Strict uses of the terms use the word "proper". | |
68 // | |
69 // Specifically, every class is its own subtype* and supertype*. | |
70 // (This trick is easier than continually saying things like "Y is a | |
71 // subtype of X or X itself".) | |
72 // | |
73 // Sometimes we write X > Y to mean X is a proper supertype of Y. | |
74 // The notation X > {Y, Z} means X has proper subtypes Y, Z. | |
75 // The notation X.m > Y means that Y inherits m from X, while | |
76 // X.m > Y.m means Y overrides X.m. A star denotes abstractness, | |
77 // as *I > A, meaning (abstract) interface I is a super type of A, | |
78 // or A.*m > B.m, meaning B.m implements abstract method A.m. | |
79 // | |
80 // In this module, the terms "subtype" and "supertype" refer to | |
81 // Java-level reference type conversions, as detected by | |
82 // "instanceof" and performed by "checkcast" operations. The method | |
83 // Klass::is_subtype_of tests these relations. Note that "subtype" | |
84 // is richer than "subclass" (as tested by Klass::is_subclass_of), | |
85 // since it takes account of relations involving interface and array | |
86 // types. | |
87 // | |
88 // To avoid needless complexity, dependencies involving array types | |
89 // are not accepted. If you need to make an assertion about an | |
90 // array type, make the assertion about its corresponding element | |
91 // types. Any assertion that might change about an array type can | |
92 // be converted to an assertion about its element type. | |
93 // | |
94 // Most dependencies are evaluated over a "context type" CX, which | |
95 // stands for the set Subtypes(CX) of every Java type that is a subtype* | |
96 // of CX. When the system loads a new class or interface N, it is | |
97 // responsible for re-evaluating changed dependencies whose context | |
98 // type now includes N, that is, all super types of N. | |
99 // | |
100 enum DepType { | |
101 end_marker = 0, | |
102 | |
103 // An 'evol' dependency simply notes that the contents of the | |
104 // method were used. If it evolves (is replaced), the nmethod | |
105 // must be recompiled. No other dependencies are implied. | |
106 evol_method, | |
107 FIRST_TYPE = evol_method, | |
108 | |
109 // A context type CX is a leaf it if has no proper subtype. | |
110 leaf_type, | |
111 | |
112 // An abstract class CX has exactly one concrete subtype CC. | |
113 abstract_with_unique_concrete_subtype, | |
114 | |
115 // The type CX is purely abstract, with no concrete subtype* at all. | |
116 abstract_with_no_concrete_subtype, | |
117 | |
118 // The concrete CX is free of concrete proper subtypes. | |
119 concrete_with_no_concrete_subtype, | |
120 | |
121 // Given a method M1 and a context class CX, the set MM(CX, M1) of | |
122 // "concrete matching methods" in CX of M1 is the set of every | |
123 // concrete M2 for which it is possible to create an invokevirtual | |
124 // or invokeinterface call site that can reach either M1 or M2. | |
125 // That is, M1 and M2 share a name, signature, and vtable index. | |
126 // We wish to notice when the set MM(CX, M1) is just {M1}, or | |
127 // perhaps a set of two {M1,M2}, and issue dependencies on this. | |
128 | |
129 // The set MM(CX, M1) can be computed by starting with any matching | |
130 // concrete M2 that is inherited into CX, and then walking the | |
131 // subtypes* of CX looking for concrete definitions. | |
132 | |
133 // The parameters to this dependency are the method M1 and the | |
134 // context class CX. M1 must be either inherited in CX or defined | |
135 // in a subtype* of CX. It asserts that MM(CX, M1) is no greater | |
136 // than {M1}. | |
137 unique_concrete_method, // one unique concrete method under CX | |
138 | |
139 // An "exclusive" assertion concerns two methods or subtypes, and | |
140 // declares that there are at most two (or perhaps later N>2) | |
141 // specific items that jointly satisfy the restriction. | |
142 // We list all items explicitly rather than just giving their | |
143 // count, for robustness in the face of complex schema changes. | |
144 | |
145 // A context class CX (which may be either abstract or concrete) | |
146 // has two exclusive concrete subtypes* C1, C2 if every concrete | |
147 // subtype* of CX is either C1 or C2. Note that if neither C1 or C2 | |
148 // are equal to CX, then CX itself must be abstract. But it is | |
149 // also possible (for example) that C1 is CX (a concrete class) | |
150 // and C2 is a proper subtype of C1. | |
151 abstract_with_exclusive_concrete_subtypes_2, | |
152 | |
153 // This dependency asserts that MM(CX, M1) is no greater than {M1,M2}. | |
154 exclusive_concrete_methods_2, | |
155 | |
156 // This dependency asserts that no instances of class or it's | |
157 // subclasses require finalization registration. | |
158 no_finalizable_subclasses, | |
159 | |
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160 // This dependency asserts when the CallSite.target value changed. |
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161 call_site_target_value, |
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162 |
0 | 163 TYPE_LIMIT |
164 }; | |
165 enum { | |
166 LG2_TYPE_LIMIT = 4, // assert(TYPE_LIMIT <= (1<<LG2_TYPE_LIMIT)) | |
167 | |
168 // handy categorizations of dependency types: | |
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169 all_types = ((1 << TYPE_LIMIT) - 1) & ((-1) << FIRST_TYPE), |
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170 |
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171 non_klass_types = (1 << call_site_target_value), |
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172 klass_types = all_types & ~non_klass_types, |
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173 |
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174 non_ctxk_types = (1 << evol_method), |
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175 implicit_ctxk_types = (1 << call_site_target_value), |
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176 explicit_ctxk_types = all_types & ~(non_ctxk_types | implicit_ctxk_types), |
0 | 177 |
178 max_arg_count = 3, // current maximum number of arguments (incl. ctxk) | |
179 | |
180 // A "context type" is a class or interface that | |
181 // provides context for evaluating a dependency. | |
182 // When present, it is one of the arguments (dep_context_arg). | |
183 // | |
184 // If a dependency does not have a context type, there is a | |
185 // default context, depending on the type of the dependency. | |
186 // This bit signals that a default context has been compressed away. | |
187 default_context_type_bit = (1<<LG2_TYPE_LIMIT) | |
188 }; | |
189 | |
190 static const char* dep_name(DepType dept); | |
191 static int dep_args(DepType dept); | |
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192 |
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193 static bool is_klass_type( DepType dept) { return dept_in_mask(dept, klass_types ); } |
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194 |
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195 static bool has_explicit_context_arg(DepType dept) { return dept_in_mask(dept, explicit_ctxk_types); } |
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196 static bool has_implicit_context_arg(DepType dept) { return dept_in_mask(dept, implicit_ctxk_types); } |
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197 |
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198 static int dep_context_arg(DepType dept) { return has_explicit_context_arg(dept) ? 0 : -1; } |
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199 static int dep_implicit_context_arg(DepType dept) { return has_implicit_context_arg(dept) ? 0 : -1; } |
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200 |
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201 static void check_valid_dependency_type(DepType dept); |
0 | 202 |
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203 #ifdef GRAAL |
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204 // A Metadata* or object value recorded in an OopRecorder |
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205 class DepValue VALUE_OBJ_CLASS_SPEC { |
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206 private: |
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207 // Unique identifier of the value within the associated OopRecorder that |
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208 // encodes both the category of the value (0: invalid, positive: metadata, negative: object) |
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209 // and the index within a category specific array (metadata: index + 1, object: -(index + 1)) |
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210 int _id; |
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211 |
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212 public: |
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213 DepValue() : _id(0) {} |
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214 DepValue(OopRecorder* rec, Metadata* metadata, DepValue* candidate = NULL) { |
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215 assert(candidate == NULL || candidate->is_metadata(), "oops"); |
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216 if (candidate != NULL && candidate->as_metadata(rec) == metadata) { |
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217 _id = candidate->_id; |
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218 } else { |
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219 _id = rec->find_index(metadata) + 1; |
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220 } |
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221 } |
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222 DepValue(OopRecorder* rec, jobject obj, DepValue* candidate = NULL) { |
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223 assert(candidate == NULL || candidate->is_object(), "oops"); |
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224 if (candidate != NULL && candidate->as_object(rec) == obj) { |
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225 _id = candidate->_id; |
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226 } else { |
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227 _id = -(rec->find_index(obj) + 1); |
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228 } |
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229 } |
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230 |
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231 // Used to sort values in ascending order of index() with metadata values preceding object values |
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232 int sort_key() const { return -_id; } |
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233 |
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234 bool operator == (const DepValue& other) const { return other._id == _id; } |
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235 |
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236 bool is_valid() const { return _id != 0; } |
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237 int index() const { assert(is_valid(), "oops"); return _id < 0 ? -(_id + 1) : _id - 1; } |
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238 bool is_metadata() const { assert(is_valid(), "oops"); return _id > 0; } |
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239 bool is_object() const { assert(is_valid(), "oops"); return _id < 0; } |
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240 |
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241 Metadata* as_metadata(OopRecorder* rec) const { assert(is_metadata(), "oops"); return rec->metadata_at(index()); } |
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242 Klass* as_klass(OopRecorder* rec) const { assert(as_metadata(rec)->is_klass(), "oops"); return (Klass*) as_metadata(rec); } |
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243 Method* as_method(OopRecorder* rec) const { assert(as_metadata(rec)->is_method(), "oops"); return (Method*) as_metadata(rec); } |
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244 jobject as_object(OopRecorder* rec) const { assert(is_object(), "oops"); return rec->oop_at(index()); } |
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245 }; |
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246 #endif |
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247 |
0 | 248 private: |
249 // State for writing a new set of dependencies: | |
250 GrowableArray<int>* _dep_seen; // (seen[h->ident] & (1<<dept)) | |
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251 GrowableArray<ciBaseObject*>* _deps[TYPE_LIMIT]; |
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252 #ifdef GRAAL |
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253 bool _using_dep_values; |
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254 GrowableArray<DepValue>* _dep_values[TYPE_LIMIT]; |
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255 #endif |
0 | 256 |
257 static const char* _dep_name[TYPE_LIMIT]; | |
258 static int _dep_args[TYPE_LIMIT]; | |
259 | |
260 static bool dept_in_mask(DepType dept, int mask) { | |
261 return (int)dept >= 0 && dept < TYPE_LIMIT && ((1<<dept) & mask) != 0; | |
262 } | |
263 | |
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264 bool note_dep_seen(int dept, ciBaseObject* x) { |
0 | 265 assert(dept < BitsPerInt, "oob"); |
266 int x_id = x->ident(); | |
267 assert(_dep_seen != NULL, "deps must be writable"); | |
268 int seen = _dep_seen->at_grow(x_id, 0); | |
269 _dep_seen->at_put(x_id, seen | (1<<dept)); | |
270 // return true if we've already seen dept/x | |
271 return (seen & (1<<dept)) != 0; | |
272 } | |
273 | |
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274 #ifdef GRAAL |
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275 bool note_dep_seen(int dept, DepValue x) { |
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276 assert(dept < BitsPerInt, "oops"); |
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277 // place metadata deps at even indexes, object deps at odd indexes |
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278 int x_id = x.is_metadata() ? x.index() * 2 : (x.index() * 2) + 1; |
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279 assert(_dep_seen != NULL, "deps must be writable"); |
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280 int seen = _dep_seen->at_grow(x_id, 0); |
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281 _dep_seen->at_put(x_id, seen | (1<<dept)); |
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282 // return true if we've already seen dept/x |
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283 return (seen & (1<<dept)) != 0; |
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284 } |
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285 #endif |
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286 |
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287 bool maybe_merge_ctxk(GrowableArray<ciBaseObject*>* deps, |
0 | 288 int ctxk_i, ciKlass* ctxk); |
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289 #ifdef GRAAL |
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290 bool maybe_merge_ctxk(GrowableArray<DepValue>* deps, |
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291 int ctxk_i, DepValue ctxk); |
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292 #endif |
0 | 293 |
294 void sort_all_deps(); | |
295 size_t estimate_size_in_bytes(); | |
296 | |
297 // Initialize _deps, etc. | |
298 void initialize(ciEnv* env); | |
299 | |
300 // State for making a new set of dependencies: | |
301 OopRecorder* _oop_recorder; | |
302 | |
303 // Logging support | |
304 CompileLog* _log; | |
305 | |
306 address _content_bytes; // everything but the oop references, encoded | |
307 size_t _size_in_bytes; | |
308 | |
309 public: | |
310 // Make a new empty dependencies set. | |
311 Dependencies(ciEnv* env) { | |
312 initialize(env); | |
313 } | |
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314 #ifdef GRAAL |
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315 Dependencies(Arena* arena, OopRecorder* oop_recorder); |
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316 #endif // GRAAL |
0 | 317 |
318 private: | |
319 // Check for a valid context type. | |
320 // Enforce the restriction against array types. | |
321 static void check_ctxk(ciKlass* ctxk) { | |
322 assert(ctxk->is_instance_klass(), "java types only"); | |
323 } | |
324 static void check_ctxk_concrete(ciKlass* ctxk) { | |
325 assert(is_concrete_klass(ctxk->as_instance_klass()), "must be concrete"); | |
326 } | |
327 static void check_ctxk_abstract(ciKlass* ctxk) { | |
328 check_ctxk(ctxk); | |
329 assert(!is_concrete_klass(ctxk->as_instance_klass()), "must be abstract"); | |
330 } | |
331 | |
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332 void assert_common_1(DepType dept, ciBaseObject* x); |
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333 void assert_common_2(DepType dept, ciBaseObject* x0, ciBaseObject* x1); |
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334 void assert_common_3(DepType dept, ciKlass* ctxk, ciBaseObject* x1, ciBaseObject* x2); |
0 | 335 |
336 public: | |
337 // Adding assertions to a new dependency set at compile time: | |
338 void assert_evol_method(ciMethod* m); | |
339 void assert_leaf_type(ciKlass* ctxk); | |
340 void assert_abstract_with_unique_concrete_subtype(ciKlass* ctxk, ciKlass* conck); | |
341 void assert_abstract_with_no_concrete_subtype(ciKlass* ctxk); | |
342 void assert_concrete_with_no_concrete_subtype(ciKlass* ctxk); | |
343 void assert_unique_concrete_method(ciKlass* ctxk, ciMethod* uniqm); | |
344 void assert_abstract_with_exclusive_concrete_subtypes(ciKlass* ctxk, ciKlass* k1, ciKlass* k2); | |
345 void assert_exclusive_concrete_methods(ciKlass* ctxk, ciMethod* m1, ciMethod* m2); | |
346 void assert_has_no_finalizable_subclasses(ciKlass* ctxk); | |
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347 void assert_call_site_target_value(ciCallSite* call_site, ciMethodHandle* method_handle); |
0 | 348 |
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349 #ifdef GRAAL |
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350 private: |
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351 static void check_ctxk(Klass* ctxk) { |
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352 assert(ctxk->oop_is_instance(), "java types only"); |
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353 } |
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354 static void check_ctxk_abstract(Klass* ctxk) { |
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355 check_ctxk(ctxk); |
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356 assert(ctxk->is_abstract(), "must be abstract"); |
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357 } |
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358 void assert_common_1(DepType dept, DepValue x); |
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359 void assert_common_2(DepType dept, DepValue x0, DepValue x1); |
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360 |
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361 public: |
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362 void assert_evol_method(Method* m); |
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363 void assert_has_no_finalizable_subclasses(Klass* ctxk); |
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364 void assert_leaf_type(Klass* ctxk); |
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365 void assert_unique_concrete_method(Klass* ctxk, Method* uniqm); |
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366 void assert_abstract_with_unique_concrete_subtype(Klass* ctxk, Klass* conck); |
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367 void assert_call_site_target_value(oop callSite, oop methodHandle); |
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368 #endif // GRAAL |
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369 |
0 | 370 // Define whether a given method or type is concrete. |
371 // These methods define the term "concrete" as used in this module. | |
372 // For this module, an "abstract" class is one which is non-concrete. | |
373 // | |
374 // Future optimizations may allow some classes to remain | |
375 // non-concrete until their first instantiation, and allow some | |
376 // methods to remain non-concrete until their first invocation. | |
377 // In that case, there would be a middle ground between concrete | |
378 // and abstract (as defined by the Java language and VM). | |
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379 static bool is_concrete_klass(Klass* k); // k is instantiable |
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380 static bool is_concrete_method(Method* m); // m is invocable |
0 | 381 static Klass* find_finalizable_subclass(Klass* k); |
382 | |
383 // These versions of the concreteness queries work through the CI. | |
384 // The CI versions are allowed to skew sometimes from the VM | |
385 // (oop-based) versions. The cost of such a difference is a | |
386 // (safely) aborted compilation, or a deoptimization, or a missed | |
387 // optimization opportunity. | |
388 // | |
389 // In order to prevent spurious assertions, query results must | |
390 // remain stable within any single ciEnv instance. (I.e., they must | |
391 // not go back into the VM to get their value; they must cache the | |
392 // bit in the CI, either eagerly or lazily.) | |
393 static bool is_concrete_klass(ciInstanceKlass* k); // k appears instantiable | |
394 static bool is_concrete_method(ciMethod* m); // m appears invocable | |
395 static bool has_finalizable_subclass(ciInstanceKlass* k); | |
396 | |
397 // As a general rule, it is OK to compile under the assumption that | |
398 // a given type or method is concrete, even if it at some future | |
399 // point becomes abstract. So dependency checking is one-sided, in | |
400 // that it permits supposedly concrete classes or methods to turn up | |
401 // as really abstract. (This shouldn't happen, except during class | |
402 // evolution, but that's the logic of the checking.) However, if a | |
403 // supposedly abstract class or method suddenly becomes concrete, a | |
404 // dependency on it must fail. | |
405 | |
406 // Checking old assertions at run-time (in the VM only): | |
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407 static Klass* check_evol_method(Method* m); |
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408 static Klass* check_leaf_type(Klass* ctxk); |
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409 static Klass* check_abstract_with_unique_concrete_subtype(Klass* ctxk, Klass* conck, |
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410 KlassDepChange* changes = NULL); |
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411 static Klass* check_abstract_with_no_concrete_subtype(Klass* ctxk, |
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412 KlassDepChange* changes = NULL); |
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413 static Klass* check_concrete_with_no_concrete_subtype(Klass* ctxk, |
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414 KlassDepChange* changes = NULL); |
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415 static Klass* check_unique_concrete_method(Klass* ctxk, Method* uniqm, |
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416 KlassDepChange* changes = NULL); |
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417 static Klass* check_abstract_with_exclusive_concrete_subtypes(Klass* ctxk, Klass* k1, Klass* k2, |
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418 KlassDepChange* changes = NULL); |
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419 static Klass* check_exclusive_concrete_methods(Klass* ctxk, Method* m1, Method* m2, |
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420 KlassDepChange* changes = NULL); |
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421 static Klass* check_has_no_finalizable_subclasses(Klass* ctxk, KlassDepChange* changes = NULL); |
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422 static Klass* check_call_site_target_value(oop call_site, oop method_handle, CallSiteDepChange* changes = NULL); |
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423 // A returned Klass* is NULL if the dependency assertion is still |
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424 // valid. A non-NULL Klass* is a 'witness' to the assertion |
0 | 425 // failure, a point in the class hierarchy where the assertion has |
426 // been proven false. For example, if check_leaf_type returns | |
427 // non-NULL, the value is a subtype of the supposed leaf type. This | |
428 // witness value may be useful for logging the dependency failure. | |
429 // Note that, when a dependency fails, there may be several possible | |
430 // witnesses to the failure. The value returned from the check_foo | |
431 // method is chosen arbitrarily. | |
432 | |
433 // The 'changes' value, if non-null, requests a limited spot-check | |
434 // near the indicated recent changes in the class hierarchy. | |
435 // It is used by DepStream::spot_check_dependency_at. | |
436 | |
437 // Detecting possible new assertions: | |
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438 static Klass* find_unique_concrete_subtype(Klass* ctxk); |
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439 static Method* find_unique_concrete_method(Klass* ctxk, Method* m); |
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440 static int find_exclusive_concrete_subtypes(Klass* ctxk, int klen, Klass* k[]); |
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441 static int find_exclusive_concrete_methods(Klass* ctxk, int mlen, Method* m[]); |
0 | 442 |
443 // Create the encoding which will be stored in an nmethod. | |
444 void encode_content_bytes(); | |
445 | |
446 address content_bytes() { | |
447 assert(_content_bytes != NULL, "encode it first"); | |
448 return _content_bytes; | |
449 } | |
450 size_t size_in_bytes() { | |
451 assert(_content_bytes != NULL, "encode it first"); | |
452 return _size_in_bytes; | |
453 } | |
454 | |
455 OopRecorder* oop_recorder() { return _oop_recorder; } | |
456 CompileLog* log() { return _log; } | |
457 | |
458 void copy_to(nmethod* nm); | |
459 | |
460 void log_all_dependencies(); | |
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461 void log_dependency(DepType dept, int nargs, ciBaseObject* args[]) { |
0 | 462 write_dependency_to(log(), dept, nargs, args); |
463 } | |
464 void log_dependency(DepType dept, | |
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465 ciBaseObject* x0, |
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466 ciBaseObject* x1 = NULL, |
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467 ciBaseObject* x2 = NULL) { |
0 | 468 if (log() == NULL) return; |
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469 ciBaseObject* args[max_arg_count]; |
0 | 470 args[0] = x0; |
471 args[1] = x1; | |
472 args[2] = x2; | |
473 assert(2 < max_arg_count, ""); | |
474 log_dependency(dept, dep_args(dept), args); | |
475 } | |
476 | |
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477 class DepArgument : public ResourceObj { |
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478 private: |
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479 bool _is_oop; |
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480 bool _valid; |
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481 void* _value; |
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482 public: |
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483 DepArgument() : _is_oop(false), _value(NULL), _valid(false) {} |
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484 DepArgument(oop v): _is_oop(true), _value(v), _valid(true) {} |
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485 DepArgument(Metadata* v): _is_oop(false), _value(v), _valid(true) {} |
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486 |
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487 bool is_null() const { return _value == NULL; } |
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488 bool is_oop() const { return _is_oop; } |
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489 bool is_metadata() const { return !_is_oop; } |
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490 bool is_klass() const { return is_metadata() && metadata_value()->is_klass(); } |
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491 bool is_method() const { return is_metadata() && metadata_value()->is_method(); } |
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492 |
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493 oop oop_value() const { assert(_is_oop && _valid, "must be"); return (oop) _value; } |
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494 Metadata* metadata_value() const { assert(!_is_oop && _valid, "must be"); return (Metadata*) _value; } |
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495 }; |
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496 |
0 | 497 static void write_dependency_to(CompileLog* log, |
498 DepType dept, | |
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499 int nargs, ciBaseObject* args[], |
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500 Klass* witness = NULL); |
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501 static void write_dependency_to(CompileLog* log, |
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502 DepType dept, |
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503 int nargs, DepArgument args[], |
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504 Klass* witness = NULL); |
0 | 505 static void write_dependency_to(xmlStream* xtty, |
506 DepType dept, | |
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507 int nargs, DepArgument args[], |
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508 Klass* witness = NULL); |
0 | 509 static void print_dependency(DepType dept, |
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510 int nargs, DepArgument args[], |
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511 Klass* witness = NULL); |
0 | 512 |
513 private: | |
514 // helper for encoding common context types as zero: | |
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515 static ciKlass* ctxk_encoded_as_null(DepType dept, ciBaseObject* x); |
0 | 516 |
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517 static Klass* ctxk_encoded_as_null(DepType dept, Metadata* x); |
0 | 518 |
519 public: | |
520 // Use this to iterate over an nmethod's dependency set. | |
521 // Works on new and old dependency sets. | |
522 // Usage: | |
523 // | |
524 // ; | |
525 // Dependencies::DepType dept; | |
526 // for (Dependencies::DepStream deps(nm); deps.next(); ) { | |
527 // ... | |
528 // } | |
529 // | |
530 // The caller must be in the VM, since oops are not wrapped in handles. | |
531 class DepStream { | |
532 private: | |
533 nmethod* _code; // null if in a compiler thread | |
534 Dependencies* _deps; // null if not in a compiler thread | |
535 CompressedReadStream _bytes; | |
536 #ifdef ASSERT | |
537 size_t _byte_limit; | |
538 #endif | |
539 | |
540 // iteration variables: | |
541 DepType _type; | |
542 int _xi[max_arg_count+1]; | |
543 | |
544 void initial_asserts(size_t byte_limit) NOT_DEBUG({}); | |
545 | |
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546 inline Metadata* recorded_metadata_at(int i); |
0 | 547 inline oop recorded_oop_at(int i); |
548 | |
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549 Klass* check_klass_dependency(KlassDepChange* changes); |
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550 Klass* check_call_site_dependency(CallSiteDepChange* changes); |
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551 |
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552 void trace_and_log_witness(Klass* witness); |
0 | 553 |
554 public: | |
555 DepStream(Dependencies* deps) | |
556 : _deps(deps), | |
557 _code(NULL), | |
558 _bytes(deps->content_bytes()) | |
559 { | |
560 initial_asserts(deps->size_in_bytes()); | |
561 } | |
562 DepStream(nmethod* code) | |
563 : _deps(NULL), | |
564 _code(code), | |
565 _bytes(code->dependencies_begin()) | |
566 { | |
567 initial_asserts(code->dependencies_size()); | |
568 } | |
569 | |
570 bool next(); | |
571 | |
572 DepType type() { return _type; } | |
573 int argument_count() { return dep_args(type()); } | |
574 int argument_index(int i) { assert(0 <= i && i < argument_count(), "oob"); | |
575 return _xi[i]; } | |
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576 Metadata* argument(int i); // => recorded_oop_at(argument_index(i)) |
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577 oop argument_oop(int i); // => recorded_oop_at(argument_index(i)) |
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578 Klass* context_type(); |
0 | 579 |
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580 bool is_klass_type() { return Dependencies::is_klass_type(type()); } |
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581 |
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582 Method* method_argument(int i) { |
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583 Metadata* x = argument(i); |
0 | 584 assert(x->is_method(), "type"); |
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585 return (Method*) x; |
0 | 586 } |
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587 Klass* type_argument(int i) { |
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588 Metadata* x = argument(i); |
0 | 589 assert(x->is_klass(), "type"); |
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590 return (Klass*) x; |
0 | 591 } |
592 | |
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593 // The point of the whole exercise: Is this dep still OK? |
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594 Klass* check_dependency() { |
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595 Klass* result = check_klass_dependency(NULL); |
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596 if (result != NULL) return result; |
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597 return check_call_site_dependency(NULL); |
0 | 598 } |
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599 |
0 | 600 // A lighter version: Checks only around recent changes in a class |
601 // hierarchy. (See Universe::flush_dependents_on.) | |
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602 Klass* spot_check_dependency_at(DepChange& changes); |
0 | 603 |
604 // Log the current dependency to xtty or compilation log. | |
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605 void log_dependency(Klass* witness = NULL); |
0 | 606 |
607 // Print the current dependency to tty. | |
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608 void print_dependency(Klass* witness = NULL, bool verbose = false); |
0 | 609 }; |
610 friend class Dependencies::DepStream; | |
611 | |
612 static void print_statistics() PRODUCT_RETURN; | |
613 }; | |
614 | |
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615 |
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616 // Every particular DepChange is a sub-class of this class. |
0 | 617 class DepChange : public StackObj { |
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618 public: |
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619 // What kind of DepChange is this? |
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620 virtual bool is_klass_change() const { return false; } |
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621 virtual bool is_call_site_change() const { return false; } |
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622 |
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623 // Subclass casting with assertions. |
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624 KlassDepChange* as_klass_change() { |
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625 assert(is_klass_change(), "bad cast"); |
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626 return (KlassDepChange*) this; |
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627 } |
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628 CallSiteDepChange* as_call_site_change() { |
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629 assert(is_call_site_change(), "bad cast"); |
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630 return (CallSiteDepChange*) this; |
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631 } |
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632 |
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633 void print(); |
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634 |
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635 public: |
0 | 636 enum ChangeType { |
637 NO_CHANGE = 0, // an uninvolved klass | |
638 Change_new_type, // a newly loaded type | |
639 Change_new_sub, // a super with a new subtype | |
640 Change_new_impl, // an interface with a new implementation | |
641 CHANGE_LIMIT, | |
642 Start_Klass = CHANGE_LIMIT // internal indicator for ContextStream | |
643 }; | |
644 | |
645 // Usage: | |
646 // for (DepChange::ContextStream str(changes); str.next(); ) { | |
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647 // Klass* k = str.klass(); |
0 | 648 // switch (str.change_type()) { |
649 // ... | |
650 // } | |
651 // } | |
652 class ContextStream : public StackObj { | |
653 private: | |
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654 DepChange& _changes; |
0 | 655 friend class DepChange; |
656 | |
657 // iteration variables: | |
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658 ChangeType _change_type; |
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659 Klass* _klass; |
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660 Array<Klass*>* _ti_base; // i.e., transitive_interfaces |
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661 int _ti_index; |
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662 int _ti_limit; |
0 | 663 |
664 // start at the beginning: | |
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665 void start(); |
0 | 666 |
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667 public: |
0 | 668 ContextStream(DepChange& changes) |
669 : _changes(changes) | |
670 { start(); } | |
671 | |
672 ContextStream(DepChange& changes, No_Safepoint_Verifier& nsv) | |
673 : _changes(changes) | |
674 // the nsv argument makes it safe to hold oops like _klass | |
675 { start(); } | |
676 | |
677 bool next(); | |
678 | |
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679 ChangeType change_type() { return _change_type; } |
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680 Klass* klass() { return _klass; } |
0 | 681 }; |
682 friend class DepChange::ContextStream; | |
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683 }; |
0 | 684 |
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685 |
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686 // A class hierarchy change coming through the VM (under the Compile_lock). |
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687 // The change is structured as a single new type with any number of supers |
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688 // and implemented interface types. Other than the new type, any of the |
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689 // super types can be context types for a relevant dependency, which the |
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690 // new type could invalidate. |
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691 class KlassDepChange : public DepChange { |
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692 private: |
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693 // each change set is rooted in exactly one new type (at present): |
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694 KlassHandle _new_type; |
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695 |
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696 void initialize(); |
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697 |
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698 public: |
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699 // notes the new type, marks it and all its super-types |
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700 KlassDepChange(KlassHandle new_type) |
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701 : _new_type(new_type) |
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702 { |
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703 initialize(); |
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704 } |
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705 |
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706 // cleans up the marks |
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707 ~KlassDepChange(); |
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708 |
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709 // What kind of DepChange is this? |
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710 virtual bool is_klass_change() const { return true; } |
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711 |
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712 Klass* new_type() { return _new_type(); } |
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713 |
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714 // involves_context(k) is true if k is new_type or any of the super types |
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715 bool involves_context(Klass* k); |
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716 }; |
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717 |
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718 |
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719 // A CallSite has changed its target. |
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720 class CallSiteDepChange : public DepChange { |
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721 private: |
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722 Handle _call_site; |
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723 Handle _method_handle; |
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724 |
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725 public: |
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726 CallSiteDepChange(Handle call_site, Handle method_handle) |
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727 : _call_site(call_site), |
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728 _method_handle(method_handle) |
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729 { |
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730 assert(_call_site() ->is_a(SystemDictionary::CallSite_klass()), "must be"); |
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731 assert(_method_handle()->is_a(SystemDictionary::MethodHandle_klass()), "must be"); |
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732 } |
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733 |
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734 // What kind of DepChange is this? |
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735 virtual bool is_call_site_change() const { return true; } |
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736 |
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737 oop call_site() const { return _call_site(); } |
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738 oop method_handle() const { return _method_handle(); } |
0 | 739 }; |
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741 #endif // SHARE_VM_CODE_DEPENDENCIES_HPP |