Mercurial > hg > graal-jvmci-8
annotate src/share/vm/code/dependencies.cpp @ 23732:5dae5deb92fb
8162477: [JVMCI] assert(wf.check_method_context(ctxk, m)) failed: proper context
Reviewed-by: kvn
| author | never |
|---|---|
| date | Tue, 02 Aug 2016 17:12:16 -0700 |
| parents | dd9cc155639c |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 20785 | 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" | |
| 7735 | 33 #include "oops/objArrayKlass.hpp" |
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34 #include "runtime/handles.hpp" |
| 1972 | 35 #include "runtime/handles.inline.hpp" |
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36 #include "runtime/thread.inline.hpp" |
| 1972 | 37 #include "utilities/copy.hpp" |
| 0 | 38 |
| 39 | |
| 40 #ifdef ASSERT | |
| 41 static bool must_be_in_vm() { | |
| 42 Thread* thread = Thread::current(); | |
| 43 if (thread->is_Java_thread()) | |
| 44 return ((JavaThread*)thread)->thread_state() == _thread_in_vm; | |
| 45 else | |
| 46 return true; //something like this: thread->is_VM_thread(); | |
| 47 } | |
| 48 #endif //ASSERT | |
| 49 | |
| 50 void Dependencies::initialize(ciEnv* env) { | |
| 51 Arena* arena = env->arena(); | |
| 52 _oop_recorder = env->oop_recorder(); | |
| 53 _log = env->log(); | |
| 54 _dep_seen = new(arena) GrowableArray<int>(arena, 500, 0, 0); | |
| 22298 | 55 #if INCLUDE_JVMCI |
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56 _using_dep_values = false; |
| 22298 | 57 #endif |
| 0 | 58 DEBUG_ONLY(_deps[end_marker] = NULL); |
| 59 for (int i = (int)FIRST_TYPE; i < (int)TYPE_LIMIT; i++) { | |
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60 _deps[i] = new(arena) GrowableArray<ciBaseObject*>(arena, 10, 0, 0); |
| 0 | 61 } |
| 62 _content_bytes = NULL; | |
| 63 _size_in_bytes = (size_t)-1; | |
| 64 | |
| 65 assert(TYPE_LIMIT <= (1<<LG2_TYPE_LIMIT), "sanity"); | |
| 66 } | |
| 67 | |
| 68 void Dependencies::assert_evol_method(ciMethod* m) { | |
| 69 assert_common_1(evol_method, m); | |
| 70 } | |
| 71 | |
| 72 void Dependencies::assert_leaf_type(ciKlass* ctxk) { | |
| 73 if (ctxk->is_array_klass()) { | |
| 74 // As a special case, support this assertion on an array type, | |
| 75 // which reduces to an assertion on its element type. | |
| 76 // Note that this cannot be done with assertions that | |
| 77 // relate to concreteness or abstractness. | |
| 78 ciType* elemt = ctxk->as_array_klass()->base_element_type(); | |
| 79 if (!elemt->is_instance_klass()) return; // Ex: int[][] | |
| 80 ctxk = elemt->as_instance_klass(); | |
| 81 //if (ctxk->is_final()) return; // Ex: String[][] | |
| 82 } | |
| 83 check_ctxk(ctxk); | |
| 84 assert_common_1(leaf_type, ctxk); | |
| 85 } | |
| 86 | |
| 87 void Dependencies::assert_abstract_with_unique_concrete_subtype(ciKlass* ctxk, ciKlass* conck) { | |
| 88 check_ctxk_abstract(ctxk); | |
| 89 assert_common_2(abstract_with_unique_concrete_subtype, ctxk, conck); | |
| 90 } | |
| 91 | |
| 92 void Dependencies::assert_abstract_with_no_concrete_subtype(ciKlass* ctxk) { | |
| 93 check_ctxk_abstract(ctxk); | |
| 94 assert_common_1(abstract_with_no_concrete_subtype, ctxk); | |
| 95 } | |
| 96 | |
| 97 void Dependencies::assert_concrete_with_no_concrete_subtype(ciKlass* ctxk) { | |
| 98 check_ctxk_concrete(ctxk); | |
| 99 assert_common_1(concrete_with_no_concrete_subtype, ctxk); | |
| 100 } | |
| 101 | |
| 102 void Dependencies::assert_unique_concrete_method(ciKlass* ctxk, ciMethod* uniqm) { | |
| 103 check_ctxk(ctxk); | |
| 104 assert_common_2(unique_concrete_method, ctxk, uniqm); | |
| 105 } | |
| 106 | |
| 107 void Dependencies::assert_abstract_with_exclusive_concrete_subtypes(ciKlass* ctxk, ciKlass* k1, ciKlass* k2) { | |
| 108 check_ctxk(ctxk); | |
| 109 assert_common_3(abstract_with_exclusive_concrete_subtypes_2, ctxk, k1, k2); | |
| 110 } | |
| 111 | |
| 112 void Dependencies::assert_exclusive_concrete_methods(ciKlass* ctxk, ciMethod* m1, ciMethod* m2) { | |
| 113 check_ctxk(ctxk); | |
| 114 assert_common_3(exclusive_concrete_methods_2, ctxk, m1, m2); | |
| 115 } | |
| 116 | |
| 117 void Dependencies::assert_has_no_finalizable_subclasses(ciKlass* ctxk) { | |
| 118 check_ctxk(ctxk); | |
| 119 assert_common_1(no_finalizable_subclasses, ctxk); | |
| 120 } | |
| 121 | |
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122 void Dependencies::assert_call_site_target_value(ciCallSite* call_site, ciMethodHandle* method_handle) { |
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123 check_ctxk(call_site->klass()); |
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124 assert_common_2(call_site_target_value, call_site, method_handle); |
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125 } |
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126 |
| 22298 | 127 #if INCLUDE_JVMCI |
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128 |
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129 Dependencies::Dependencies(Arena* arena, OopRecorder* oop_recorder, CompileLog* log) { |
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130 _oop_recorder = oop_recorder; |
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131 _log = log; |
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132 _dep_seen = new(arena) GrowableArray<int>(arena, 500, 0, 0); |
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133 _using_dep_values = true; |
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134 DEBUG_ONLY(_dep_values[end_marker] = NULL); |
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135 for (int i = (int)FIRST_TYPE; i < (int)TYPE_LIMIT; i++) { |
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136 _dep_values[i] = new(arena) GrowableArray<DepValue>(arena, 10, 0, DepValue()); |
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137 } |
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138 _content_bytes = NULL; |
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139 _size_in_bytes = (size_t)-1; |
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140 |
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141 assert(TYPE_LIMIT <= (1<<LG2_TYPE_LIMIT), "sanity"); |
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142 } |
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143 |
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144 void Dependencies::assert_evol_method(Method* m) { |
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145 assert_common_1(evol_method, DepValue(_oop_recorder, m)); |
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146 } |
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147 |
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148 void Dependencies::assert_has_no_finalizable_subclasses(Klass* ctxk) { |
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149 check_ctxk(ctxk); |
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150 assert_common_1(no_finalizable_subclasses, DepValue(_oop_recorder, ctxk)); |
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151 } |
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152 |
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153 void Dependencies::assert_leaf_type(Klass* ctxk) { |
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154 if (ctxk->oop_is_array()) { |
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155 // As a special case, support this assertion on an array type, |
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156 // which reduces to an assertion on its element type. |
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157 // Note that this cannot be done with assertions that |
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158 // relate to concreteness or abstractness. |
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159 BasicType elemt = ArrayKlass::cast(ctxk)->element_type(); |
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160 if (is_java_primitive(elemt)) return; // Ex: int[][] |
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161 ctxk = ObjArrayKlass::cast(ctxk)->bottom_klass(); |
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162 //if (ctxk->is_final()) return; // Ex: String[][] |
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163 } |
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164 check_ctxk(ctxk); |
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165 assert_common_1(leaf_type, DepValue(_oop_recorder, ctxk)); |
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166 } |
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167 |
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168 void Dependencies::assert_abstract_with_unique_concrete_subtype(Klass* ctxk, Klass* conck) { |
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169 check_ctxk_abstract(ctxk); |
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170 DepValue ctxk_dv(_oop_recorder, ctxk); |
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171 DepValue conck_dv(_oop_recorder, conck, &ctxk_dv); |
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172 assert_common_2(abstract_with_unique_concrete_subtype, ctxk_dv, conck_dv); |
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173 } |
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174 |
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175 void Dependencies::assert_unique_concrete_method(Klass* ctxk, Method* uniqm) { |
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176 check_ctxk(ctxk); |
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177 assert_common_2(unique_concrete_method, DepValue(_oop_recorder, ctxk), DepValue(_oop_recorder, uniqm)); |
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178 } |
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179 |
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180 void Dependencies::assert_call_site_target_value(oop call_site, oop method_handle) { |
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181 assert_common_2(call_site_target_value, DepValue(_oop_recorder, JNIHandles::make_local(call_site)), DepValue(_oop_recorder, JNIHandles::make_local(method_handle))); |
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182 } |
| 22298 | 183 #endif // INCLUDE_JVMCI |
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184 |
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185 |
| 0 | 186 // Helper function. If we are adding a new dep. under ctxk2, |
| 187 // try to find an old dep. under a broader* ctxk1. If there is | |
| 188 // | |
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189 bool Dependencies::maybe_merge_ctxk(GrowableArray<ciBaseObject*>* deps, |
| 0 | 190 int ctxk_i, ciKlass* ctxk2) { |
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191 ciKlass* ctxk1 = deps->at(ctxk_i)->as_metadata()->as_klass(); |
| 0 | 192 if (ctxk2->is_subtype_of(ctxk1)) { |
| 193 return true; // success, and no need to change | |
| 194 } else if (ctxk1->is_subtype_of(ctxk2)) { | |
| 195 // new context class fully subsumes previous one | |
| 196 deps->at_put(ctxk_i, ctxk2); | |
| 197 return true; | |
| 198 } else { | |
| 199 return false; | |
| 200 } | |
| 201 } | |
| 202 | |
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203 void Dependencies::assert_common_1(DepType dept, ciBaseObject* x) { |
| 0 | 204 assert(dep_args(dept) == 1, "sanity"); |
| 205 log_dependency(dept, x); | |
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206 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
| 0 | 207 |
| 208 // see if the same (or a similar) dep is already recorded | |
| 209 if (note_dep_seen(dept, x)) { | |
| 210 assert(deps->find(x) >= 0, "sanity"); | |
| 211 } else { | |
| 212 deps->append(x); | |
| 213 } | |
| 214 } | |
| 215 | |
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216 void Dependencies::assert_common_2(DepType dept, |
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217 ciBaseObject* x0, ciBaseObject* x1) { |
| 0 | 218 assert(dep_args(dept) == 2, "sanity"); |
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219 log_dependency(dept, x0, x1); |
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220 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
| 0 | 221 |
| 222 // see if the same (or a similar) dep is already recorded | |
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223 bool has_ctxk = has_explicit_context_arg(dept); |
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224 if (has_ctxk) { |
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225 assert(dep_context_arg(dept) == 0, "sanity"); |
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226 if (note_dep_seen(dept, x1)) { |
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227 // look in this bucket for redundant assertions |
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228 const int stride = 2; |
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229 for (int i = deps->length(); (i -= stride) >= 0; ) { |
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230 ciBaseObject* y1 = deps->at(i+1); |
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231 if (x1 == y1) { // same subject; check the context |
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232 if (maybe_merge_ctxk(deps, i+0, x0->as_metadata()->as_klass())) { |
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233 return; |
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234 } |
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235 } |
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236 } |
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237 } |
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238 } else { |
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239 assert(dep_implicit_context_arg(dept) == 0, "sanity"); |
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240 if (note_dep_seen(dept, x0) && note_dep_seen(dept, x1)) { |
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241 // look in this bucket for redundant assertions |
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242 const int stride = 2; |
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243 for (int i = deps->length(); (i -= stride) >= 0; ) { |
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244 ciBaseObject* y0 = deps->at(i+0); |
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245 ciBaseObject* y1 = deps->at(i+1); |
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246 if (x0 == y0 && x1 == y1) { |
| 0 | 247 return; |
| 248 } | |
| 249 } | |
| 250 } | |
| 251 } | |
| 252 | |
| 253 // append the assertion in the correct bucket: | |
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254 deps->append(x0); |
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255 deps->append(x1); |
| 0 | 256 } |
| 257 | |
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258 void Dependencies::assert_common_3(DepType dept, |
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259 ciKlass* ctxk, ciBaseObject* x, ciBaseObject* x2) { |
| 0 | 260 assert(dep_context_arg(dept) == 0, "sanity"); |
| 261 assert(dep_args(dept) == 3, "sanity"); | |
| 262 log_dependency(dept, ctxk, x, x2); | |
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263 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
| 0 | 264 |
| 265 // try to normalize an unordered pair: | |
| 266 bool swap = false; | |
| 267 switch (dept) { | |
| 268 case abstract_with_exclusive_concrete_subtypes_2: | |
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269 swap = (x->ident() > x2->ident() && x->as_metadata()->as_klass() != ctxk); |
| 0 | 270 break; |
| 271 case exclusive_concrete_methods_2: | |
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272 swap = (x->ident() > x2->ident() && x->as_metadata()->as_method()->holder() != ctxk); |
| 0 | 273 break; |
| 274 } | |
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275 if (swap) { ciBaseObject* t = x; x = x2; x2 = t; } |
| 0 | 276 |
| 277 // see if the same (or a similar) dep is already recorded | |
| 278 if (note_dep_seen(dept, x) && note_dep_seen(dept, x2)) { | |
| 279 // look in this bucket for redundant assertions | |
| 280 const int stride = 3; | |
| 281 for (int i = deps->length(); (i -= stride) >= 0; ) { | |
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282 ciBaseObject* y = deps->at(i+1); |
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283 ciBaseObject* y2 = deps->at(i+2); |
| 0 | 284 if (x == y && x2 == y2) { // same subjects; check the context |
| 285 if (maybe_merge_ctxk(deps, i+0, ctxk)) { | |
| 286 return; | |
| 287 } | |
| 288 } | |
| 289 } | |
| 290 } | |
| 291 // append the assertion in the correct bucket: | |
| 292 deps->append(ctxk); | |
| 293 deps->append(x); | |
| 294 deps->append(x2); | |
| 295 } | |
| 296 | |
| 22298 | 297 #if INCLUDE_JVMCI |
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298 bool Dependencies::maybe_merge_ctxk(GrowableArray<DepValue>* deps, |
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299 int ctxk_i, DepValue ctxk2_dv) { |
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300 Klass* ctxk1 = deps->at(ctxk_i).as_klass(_oop_recorder); |
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301 Klass* ctxk2 = ctxk2_dv.as_klass(_oop_recorder); |
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302 if (ctxk2->is_subtype_of(ctxk1)) { |
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303 return true; // success, and no need to change |
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304 } else if (ctxk1->is_subtype_of(ctxk2)) { |
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305 // new context class fully subsumes previous one |
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306 deps->at_put(ctxk_i, ctxk2_dv); |
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307 return true; |
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308 } else { |
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309 return false; |
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310 } |
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311 } |
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312 |
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313 void Dependencies::assert_common_1(DepType dept, DepValue x) { |
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314 assert(dep_args(dept) == 1, "sanity"); |
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315 //log_dependency(dept, x); |
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316 GrowableArray<DepValue>* deps = _dep_values[dept]; |
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317 |
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318 // see if the same (or a similar) dep is already recorded |
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319 if (note_dep_seen(dept, x)) { |
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320 assert(deps->find(x) >= 0, "sanity"); |
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321 } else { |
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322 deps->append(x); |
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323 } |
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324 } |
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325 |
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326 void Dependencies::assert_common_2(DepType dept, |
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327 DepValue x0, DepValue x1) { |
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328 assert(dep_args(dept) == 2, "sanity"); |
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329 //log_dependency(dept, x0, x1); |
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330 GrowableArray<DepValue>* deps = _dep_values[dept]; |
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331 |
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332 // see if the same (or a similar) dep is already recorded |
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333 bool has_ctxk = has_explicit_context_arg(dept); |
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334 if (has_ctxk) { |
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335 assert(dep_context_arg(dept) == 0, "sanity"); |
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336 if (note_dep_seen(dept, x1)) { |
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337 // look in this bucket for redundant assertions |
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338 const int stride = 2; |
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339 for (int i = deps->length(); (i -= stride) >= 0; ) { |
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340 DepValue y1 = deps->at(i+1); |
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341 if (x1 == y1) { // same subject; check the context |
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342 if (maybe_merge_ctxk(deps, i+0, x0)) { |
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343 return; |
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344 } |
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345 } |
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346 } |
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347 } |
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348 } else { |
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349 assert(dep_implicit_context_arg(dept) == 0, "sanity"); |
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350 if (note_dep_seen(dept, x0) && note_dep_seen(dept, x1)) { |
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351 // look in this bucket for redundant assertions |
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352 const int stride = 2; |
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353 for (int i = deps->length(); (i -= stride) >= 0; ) { |
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354 DepValue y0 = deps->at(i+0); |
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355 DepValue y1 = deps->at(i+1); |
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356 if (x0 == y0 && x1 == y1) { |
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357 return; |
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358 } |
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359 } |
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360 } |
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361 } |
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362 |
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363 // append the assertion in the correct bucket: |
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364 deps->append(x0); |
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365 deps->append(x1); |
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366 } |
| 22298 | 367 #endif // INCLUDE_JVMCI |
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368 |
| 0 | 369 /// Support for encoding dependencies into an nmethod: |
| 370 | |
| 371 void Dependencies::copy_to(nmethod* nm) { | |
| 372 address beg = nm->dependencies_begin(); | |
| 373 address end = nm->dependencies_end(); | |
| 374 guarantee(end - beg >= (ptrdiff_t) size_in_bytes(), "bad sizing"); | |
| 375 Copy::disjoint_words((HeapWord*) content_bytes(), | |
| 376 (HeapWord*) beg, | |
| 377 size_in_bytes() / sizeof(HeapWord)); | |
| 378 assert(size_in_bytes() % sizeof(HeapWord) == 0, "copy by words"); | |
| 379 } | |
| 380 | |
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381 static int sort_dep(ciBaseObject** p1, ciBaseObject** p2, int narg) { |
| 0 | 382 for (int i = 0; i < narg; i++) { |
| 383 int diff = p1[i]->ident() - p2[i]->ident(); | |
| 384 if (diff != 0) return diff; | |
| 385 } | |
| 386 return 0; | |
| 387 } | |
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388 static int sort_dep_arg_1(ciBaseObject** p1, ciBaseObject** p2) |
| 0 | 389 { return sort_dep(p1, p2, 1); } |
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390 static int sort_dep_arg_2(ciBaseObject** p1, ciBaseObject** p2) |
| 0 | 391 { return sort_dep(p1, p2, 2); } |
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392 static int sort_dep_arg_3(ciBaseObject** p1, ciBaseObject** p2) |
| 0 | 393 { return sort_dep(p1, p2, 3); } |
| 394 | |
| 22298 | 395 #if INCLUDE_JVMCI |
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396 // metadata deps are sorted before object deps |
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397 static int sort_dep_value(Dependencies::DepValue* p1, Dependencies::DepValue* p2, int narg) { |
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398 for (int i = 0; i < narg; i++) { |
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399 int diff = p1[i].sort_key() - p2[i].sort_key(); |
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400 if (diff != 0) return diff; |
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401 } |
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402 return 0; |
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403 } |
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404 static int sort_dep_value_arg_1(Dependencies::DepValue* p1, Dependencies::DepValue* p2) |
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405 { return sort_dep_value(p1, p2, 1); } |
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406 static int sort_dep_value_arg_2(Dependencies::DepValue* p1, Dependencies::DepValue* p2) |
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407 { return sort_dep_value(p1, p2, 2); } |
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408 static int sort_dep_value_arg_3(Dependencies::DepValue* p1, Dependencies::DepValue* p2) |
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409 { return sort_dep_value(p1, p2, 3); } |
| 22298 | 410 #endif // INCLUDE_JVMCI |
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411 |
| 0 | 412 void Dependencies::sort_all_deps() { |
| 22298 | 413 #if INCLUDE_JVMCI |
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414 if (_using_dep_values) { |
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415 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { |
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416 DepType dept = (DepType)deptv; |
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417 GrowableArray<DepValue>* deps = _dep_values[dept]; |
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418 if (deps->length() <= 1) continue; |
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419 switch (dep_args(dept)) { |
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420 case 1: deps->sort(sort_dep_value_arg_1, 1); break; |
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421 case 2: deps->sort(sort_dep_value_arg_2, 2); break; |
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422 case 3: deps->sort(sort_dep_value_arg_3, 3); break; |
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423 default: ShouldNotReachHere(); |
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424 } |
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425 } |
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426 return; |
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427 } |
| 22298 | 428 #endif |
| 0 | 429 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { |
| 430 DepType dept = (DepType)deptv; | |
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431 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
| 0 | 432 if (deps->length() <= 1) continue; |
| 433 switch (dep_args(dept)) { | |
| 434 case 1: deps->sort(sort_dep_arg_1, 1); break; | |
| 435 case 2: deps->sort(sort_dep_arg_2, 2); break; | |
| 436 case 3: deps->sort(sort_dep_arg_3, 3); break; | |
| 437 default: ShouldNotReachHere(); | |
| 438 } | |
| 439 } | |
| 440 } | |
| 441 | |
| 442 size_t Dependencies::estimate_size_in_bytes() { | |
| 443 size_t est_size = 100; | |
| 22298 | 444 #if INCLUDE_JVMCI |
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445 if (_using_dep_values) { |
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446 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { |
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447 DepType dept = (DepType)deptv; |
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448 GrowableArray<DepValue>* deps = _dep_values[dept]; |
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449 est_size += deps->length() * 2; // tags and argument(s) |
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450 } |
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451 return est_size; |
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452 } |
| 22298 | 453 #endif |
| 0 | 454 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { |
| 455 DepType dept = (DepType)deptv; | |
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456 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
| 0 | 457 est_size += deps->length()*2; // tags and argument(s) |
| 458 } | |
| 459 return est_size; | |
| 460 } | |
| 461 | |
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462 ciKlass* Dependencies::ctxk_encoded_as_null(DepType dept, ciBaseObject* x) { |
| 0 | 463 switch (dept) { |
| 464 case abstract_with_exclusive_concrete_subtypes_2: | |
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465 return x->as_metadata()->as_klass(); |
| 0 | 466 case unique_concrete_method: |
| 467 case exclusive_concrete_methods_2: | |
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468 return x->as_metadata()->as_method()->holder(); |
| 0 | 469 } |
| 470 return NULL; // let NULL be NULL | |
| 471 } | |
| 472 | |
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473 Klass* Dependencies::ctxk_encoded_as_null(DepType dept, Metadata* x) { |
| 0 | 474 assert(must_be_in_vm(), "raw oops here"); |
| 475 switch (dept) { | |
| 476 case abstract_with_exclusive_concrete_subtypes_2: | |
| 477 assert(x->is_klass(), "sanity"); | |
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478 return (Klass*) x; |
| 0 | 479 case unique_concrete_method: |
| 480 case exclusive_concrete_methods_2: | |
| 481 assert(x->is_method(), "sanity"); | |
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482 return ((Method*)x)->method_holder(); |
| 0 | 483 } |
| 484 return NULL; // let NULL be NULL | |
| 485 } | |
| 486 | |
| 487 void Dependencies::encode_content_bytes() { | |
| 488 sort_all_deps(); | |
| 489 | |
| 490 // cast is safe, no deps can overflow INT_MAX | |
| 491 CompressedWriteStream bytes((int)estimate_size_in_bytes()); | |
| 492 | |
| 22298 | 493 #if INCLUDE_JVMCI |
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494 if (_using_dep_values) { |
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495 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { |
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496 DepType dept = (DepType)deptv; |
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497 GrowableArray<DepValue>* deps = _dep_values[dept]; |
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498 if (deps->length() == 0) continue; |
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499 int stride = dep_args(dept); |
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500 int ctxkj = dep_context_arg(dept); // -1 if no context arg |
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501 assert(stride > 0, "sanity"); |
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502 for (int i = 0; i < deps->length(); i += stride) { |
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503 jbyte code_byte = (jbyte)dept; |
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504 int skipj = -1; |
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505 if (ctxkj >= 0 && ctxkj+1 < stride) { |
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506 Klass* ctxk = deps->at(i+ctxkj+0).as_klass(_oop_recorder); |
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507 DepValue x = deps->at(i+ctxkj+1); // following argument |
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508 if (ctxk == ctxk_encoded_as_null(dept, x.as_metadata(_oop_recorder))) { |
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509 skipj = ctxkj; // we win: maybe one less oop to keep track of |
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510 code_byte |= default_context_type_bit; |
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511 } |
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512 } |
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513 bytes.write_byte(code_byte); |
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514 for (int j = 0; j < stride; j++) { |
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515 if (j == skipj) continue; |
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516 DepValue v = deps->at(i+j); |
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517 int idx = v.index(); |
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518 bytes.write_int(idx); |
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519 } |
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520 } |
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521 } |
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522 } else { |
| 22298 | 523 #endif |
| 0 | 524 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { |
| 525 DepType dept = (DepType)deptv; | |
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526 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
| 0 | 527 if (deps->length() == 0) continue; |
| 528 int stride = dep_args(dept); | |
| 529 int ctxkj = dep_context_arg(dept); // -1 if no context arg | |
| 530 assert(stride > 0, "sanity"); | |
| 531 for (int i = 0; i < deps->length(); i += stride) { | |
| 532 jbyte code_byte = (jbyte)dept; | |
| 533 int skipj = -1; | |
| 534 if (ctxkj >= 0 && ctxkj+1 < stride) { | |
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535 ciKlass* ctxk = deps->at(i+ctxkj+0)->as_metadata()->as_klass(); |
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536 ciBaseObject* x = deps->at(i+ctxkj+1); // following argument |
| 0 | 537 if (ctxk == ctxk_encoded_as_null(dept, x)) { |
| 538 skipj = ctxkj; // we win: maybe one less oop to keep track of | |
| 539 code_byte |= default_context_type_bit; | |
| 540 } | |
| 541 } | |
| 542 bytes.write_byte(code_byte); | |
| 543 for (int j = 0; j < stride; j++) { | |
| 544 if (j == skipj) continue; | |
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545 ciBaseObject* v = deps->at(i+j); |
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546 int idx; |
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547 if (v->is_object()) { |
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548 idx = _oop_recorder->find_index(v->as_object()->constant_encoding()); |
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549 } else { |
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550 ciMetadata* meta = v->as_metadata(); |
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551 idx = _oop_recorder->find_index(meta->constant_encoding()); |
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552 } |
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553 bytes.write_int(idx); |
| 0 | 554 } |
| 555 } | |
| 556 } | |
| 22298 | 557 #if INCLUDE_JVMCI |
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558 } |
| 22298 | 559 #endif |
| 0 | 560 |
| 561 // write a sentinel byte to mark the end | |
| 562 bytes.write_byte(end_marker); | |
| 563 | |
| 564 // round it out to a word boundary | |
| 565 while (bytes.position() % sizeof(HeapWord) != 0) { | |
| 566 bytes.write_byte(end_marker); | |
| 567 } | |
| 568 | |
| 569 // check whether the dept byte encoding really works | |
| 570 assert((jbyte)default_context_type_bit != 0, "byte overflow"); | |
| 571 | |
| 572 _content_bytes = bytes.buffer(); | |
| 573 _size_in_bytes = bytes.position(); | |
| 574 } | |
| 575 | |
| 576 | |
| 577 const char* Dependencies::_dep_name[TYPE_LIMIT] = { | |
| 578 "end_marker", | |
| 579 "evol_method", | |
| 580 "leaf_type", | |
| 581 "abstract_with_unique_concrete_subtype", | |
| 582 "abstract_with_no_concrete_subtype", | |
| 583 "concrete_with_no_concrete_subtype", | |
| 584 "unique_concrete_method", | |
| 585 "abstract_with_exclusive_concrete_subtypes_2", | |
| 586 "exclusive_concrete_methods_2", | |
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587 "no_finalizable_subclasses", |
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588 "call_site_target_value" |
| 0 | 589 }; |
| 590 | |
| 591 int Dependencies::_dep_args[TYPE_LIMIT] = { | |
| 592 -1,// end_marker | |
| 593 1, // evol_method m | |
| 594 1, // leaf_type ctxk | |
| 595 2, // abstract_with_unique_concrete_subtype ctxk, k | |
| 596 1, // abstract_with_no_concrete_subtype ctxk | |
| 597 1, // concrete_with_no_concrete_subtype ctxk | |
| 598 2, // unique_concrete_method ctxk, m | |
| 599 3, // unique_concrete_subtypes_2 ctxk, k1, k2 | |
| 600 3, // unique_concrete_methods_2 ctxk, m1, m2 | |
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601 1, // no_finalizable_subclasses ctxk |
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602 2 // call_site_target_value call_site, method_handle |
| 0 | 603 }; |
| 604 | |
| 605 const char* Dependencies::dep_name(Dependencies::DepType dept) { | |
| 606 if (!dept_in_mask(dept, all_types)) return "?bad-dep?"; | |
| 607 return _dep_name[dept]; | |
| 608 } | |
| 609 | |
| 610 int Dependencies::dep_args(Dependencies::DepType dept) { | |
| 611 if (!dept_in_mask(dept, all_types)) return -1; | |
| 612 return _dep_args[dept]; | |
| 613 } | |
| 614 | |
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615 void Dependencies::check_valid_dependency_type(DepType dept) { |
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616 guarantee(FIRST_TYPE <= dept && dept < TYPE_LIMIT, err_msg("invalid dependency type: %d", (int) dept)); |
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617 } |
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618 |
| 0 | 619 // for the sake of the compiler log, print out current dependencies: |
| 620 void Dependencies::log_all_dependencies() { | |
| 621 if (log() == NULL) return; | |
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622 ResourceMark rm; |
| 0 | 623 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { |
| 624 DepType dept = (DepType)deptv; | |
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625 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
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626 int deplen = deps->length(); |
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627 if (deplen == 0) { |
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628 continue; |
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629 } |
| 0 | 630 int stride = dep_args(dept); |
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631 GrowableArray<ciBaseObject*>* ciargs = new GrowableArray<ciBaseObject*>(stride); |
| 0 | 632 for (int i = 0; i < deps->length(); i += stride) { |
| 633 for (int j = 0; j < stride; j++) { | |
| 634 // flush out the identities before printing | |
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635 ciargs->push(deps->at(i+j)); |
| 0 | 636 } |
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637 write_dependency_to(log(), dept, ciargs); |
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638 ciargs->clear(); |
| 0 | 639 } |
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640 guarantee(deplen == deps->length(), "deps array cannot grow inside nested ResoureMark scope"); |
| 0 | 641 } |
| 642 } | |
| 643 | |
| 644 void Dependencies::write_dependency_to(CompileLog* log, | |
| 645 DepType dept, | |
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646 GrowableArray<DepArgument>* args, |
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647 Klass* witness) { |
| 0 | 648 if (log == NULL) { |
| 649 return; | |
| 650 } | |
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651 ResourceMark rm; |
| 0 | 652 ciEnv* env = ciEnv::current(); |
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653 GrowableArray<ciBaseObject*>* ciargs = new GrowableArray<ciBaseObject*>(args->length()); |
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654 for (GrowableArrayIterator<DepArgument> it = args->begin(); it != args->end(); ++it) { |
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655 DepArgument arg = *it; |
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656 if (arg.is_oop()) { |
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657 ciargs->push(env->get_object(arg.oop_value())); |
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658 } else { |
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659 ciargs->push(env->get_metadata(arg.metadata_value())); |
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660 } |
| 0 | 661 } |
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662 int argslen = ciargs->length(); |
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663 Dependencies::write_dependency_to(log, dept, ciargs, witness); |
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664 guarantee(argslen == ciargs->length(), "ciargs array cannot grow inside nested ResoureMark scope"); |
| 0 | 665 } |
| 666 | |
| 667 void Dependencies::write_dependency_to(CompileLog* log, | |
| 668 DepType dept, | |
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669 GrowableArray<ciBaseObject*>* args, |
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670 Klass* witness) { |
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671 if (log == NULL) { |
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672 return; |
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673 } |
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674 ResourceMark rm; |
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675 GrowableArray<int>* argids = new GrowableArray<int>(args->length()); |
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676 for (GrowableArrayIterator<ciBaseObject*> it = args->begin(); it != args->end(); ++it) { |
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677 ciBaseObject* obj = *it; |
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678 if (obj->is_object()) { |
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679 argids->push(log->identify(obj->as_object())); |
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680 } else { |
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681 argids->push(log->identify(obj->as_metadata())); |
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682 } |
| 0 | 683 } |
| 684 if (witness != NULL) { | |
| 685 log->begin_elem("dependency_failed"); | |
| 686 } else { | |
| 687 log->begin_elem("dependency"); | |
| 688 } | |
| 689 log->print(" type='%s'", dep_name(dept)); | |
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690 const int ctxkj = dep_context_arg(dept); // -1 if no context arg |
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691 if (ctxkj >= 0 && ctxkj < argids->length()) { |
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692 log->print(" ctxk='%d'", argids->at(ctxkj)); |
| 0 | 693 } |
| 694 // write remaining arguments, if any. | |
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695 for (int j = 0; j < argids->length(); j++) { |
| 0 | 696 if (j == ctxkj) continue; // already logged |
| 697 if (j == 1) { | |
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698 log->print( " x='%d'", argids->at(j)); |
| 0 | 699 } else { |
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700 log->print(" x%d='%d'", j, argids->at(j)); |
| 0 | 701 } |
| 702 } | |
| 703 if (witness != NULL) { | |
| 704 log->object("witness", witness); | |
| 705 log->stamp(); | |
| 706 } | |
| 707 log->end_elem(); | |
| 708 } | |
| 709 | |
| 710 void Dependencies::write_dependency_to(xmlStream* xtty, | |
| 711 DepType dept, | |
|
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712 GrowableArray<DepArgument>* args, |
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713 Klass* witness) { |
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714 if (xtty == NULL) { |
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715 return; |
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716 } |
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717 ResourceMark rm; |
| 0 | 718 ttyLocker ttyl; |
| 719 int ctxkj = dep_context_arg(dept); // -1 if no context arg | |
| 720 if (witness != NULL) { | |
| 721 xtty->begin_elem("dependency_failed"); | |
| 722 } else { | |
| 723 xtty->begin_elem("dependency"); | |
| 724 } | |
| 725 xtty->print(" type='%s'", dep_name(dept)); | |
| 726 if (ctxkj >= 0) { | |
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727 xtty->object("ctxk", args->at(ctxkj).metadata_value()); |
| 0 | 728 } |
| 729 // write remaining arguments, if any. | |
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730 for (int j = 0; j < args->length(); j++) { |
| 0 | 731 if (j == ctxkj) continue; // already logged |
|
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732 DepArgument arg = args->at(j); |
| 0 | 733 if (j == 1) { |
|
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734 if (arg.is_oop()) { |
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735 xtty->object("x", arg.oop_value()); |
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736 } else { |
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737 xtty->object("x", arg.metadata_value()); |
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738 } |
| 0 | 739 } else { |
| 740 char xn[10]; sprintf(xn, "x%d", j); | |
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741 if (arg.is_oop()) { |
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742 xtty->object(xn, arg.oop_value()); |
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743 } else { |
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744 xtty->object(xn, arg.metadata_value()); |
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745 } |
| 0 | 746 } |
| 747 } | |
| 748 if (witness != NULL) { | |
| 749 xtty->object("witness", witness); | |
| 750 xtty->stamp(); | |
| 751 } | |
| 752 xtty->end_elem(); | |
| 753 } | |
| 754 | |
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755 void Dependencies::print_dependency(DepType dept, GrowableArray<DepArgument>* args, |
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756 Klass* witness, outputStream* st) { |
| 0 | 757 ResourceMark rm; |
| 758 ttyLocker ttyl; // keep the following output all in one block | |
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759 st->print_cr("%s of type %s", |
| 0 | 760 (witness == NULL)? "Dependency": "Failed dependency", |
| 761 dep_name(dept)); | |
| 762 // print arguments | |
| 763 int ctxkj = dep_context_arg(dept); // -1 if no context arg | |
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764 for (int j = 0; j < args->length(); j++) { |
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765 DepArgument arg = args->at(j); |
| 0 | 766 bool put_star = false; |
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767 if (arg.is_null()) continue; |
| 0 | 768 const char* what; |
| 769 if (j == ctxkj) { | |
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770 assert(arg.is_metadata(), "must be"); |
| 0 | 771 what = "context"; |
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772 put_star = !Dependencies::is_concrete_klass((Klass*)arg.metadata_value()); |
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773 } else if (arg.is_method()) { |
| 0 | 774 what = "method "; |
| 20785 | 775 put_star = !Dependencies::is_concrete_method((Method*)arg.metadata_value(), NULL); |
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776 } else if (arg.is_klass()) { |
| 0 | 777 what = "class "; |
| 778 } else { | |
| 779 what = "object "; | |
| 780 } | |
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781 st->print(" %s = %s", what, (put_star? "*": "")); |
| 22746 | 782 if (arg.is_klass()) { |
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783 st->print("%s", ((Klass*)arg.metadata_value())->external_name()); |
| 22746 | 784 } else if (arg.is_method()) { |
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785 ((Method*)arg.metadata_value())->print_value_on(st); |
| 22746 | 786 } else if (arg.is_oop()) { |
| 787 arg.oop_value()->print_value_on(st); | |
| 788 } else { | |
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789 ShouldNotReachHere(); // Provide impl for this type. |
| 22746 | 790 } |
|
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791 |
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792 st->cr(); |
| 0 | 793 } |
| 794 if (witness != NULL) { | |
| 795 bool put_star = !Dependencies::is_concrete_klass(witness); | |
|
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796 st->print_cr(" witness = %s%s", |
| 0 | 797 (put_star? "*": ""), |
| 6983 | 798 witness->external_name()); |
| 0 | 799 } |
| 800 } | |
| 801 | |
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802 void Dependencies::DepStream::log_dependency(Klass* witness) { |
| 0 | 803 if (_deps == NULL && xtty == NULL) return; // fast cutout for runtime |
|
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804 ResourceMark rm; |
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805 const int nargs = argument_count(); |
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806 GrowableArray<DepArgument>* args = new GrowableArray<DepArgument>(nargs); |
| 0 | 807 for (int j = 0; j < nargs; j++) { |
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808 if (type() == call_site_target_value) { |
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809 args->push(argument_oop(j)); |
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810 } else { |
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811 args->push(argument(j)); |
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812 } |
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813 } |
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814 int argslen = args->length(); |
| 0 | 815 if (_deps != NULL && _deps->log() != NULL) { |
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816 if (ciEnv::current() != NULL) { |
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817 Dependencies::write_dependency_to(_deps->log(), |
| 20804 | 818 type(), args, witness); |
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819 } else { |
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820 // Treat the CompileLog as an xmlstream instead |
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821 Dependencies::write_dependency_to((xmlStream*)_deps->log(), |
| 20804 | 822 type(), args, witness); |
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823 } |
| 0 | 824 } else { |
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825 Dependencies::write_dependency_to(xtty, type(), args, witness); |
| 0 | 826 } |
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827 guarantee(argslen == args->length(), "args array cannot grow inside nested ResoureMark scope"); |
| 0 | 828 } |
| 829 | |
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830 void Dependencies::DepStream::print_dependency(Klass* witness, bool verbose, outputStream* st) { |
| 0 | 831 int nargs = argument_count(); |
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832 GrowableArray<DepArgument>* args = new GrowableArray<DepArgument>(nargs); |
| 0 | 833 for (int j = 0; j < nargs; j++) { |
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834 if (type() == call_site_target_value) { |
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835 args->push(argument_oop(j)); |
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836 } else { |
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837 args->push(argument(j)); |
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838 } |
| 0 | 839 } |
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840 int argslen = args->length(); |
| 20804 | 841 Dependencies::print_dependency(type(), args, witness, st); |
| 0 | 842 if (verbose) { |
| 843 if (_code != NULL) { | |
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844 st->print(" code: "); |
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845 _code->print_value_on(st); |
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846 st->cr(); |
| 0 | 847 } |
| 848 } | |
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849 guarantee(argslen == args->length(), "args array cannot grow inside nested ResoureMark scope"); |
| 0 | 850 } |
| 851 | |
| 852 | |
| 853 /// Dependency stream support (decodes dependencies from an nmethod): | |
| 854 | |
| 855 #ifdef ASSERT | |
| 856 void Dependencies::DepStream::initial_asserts(size_t byte_limit) { | |
| 857 assert(must_be_in_vm(), "raw oops here"); | |
| 858 _byte_limit = byte_limit; | |
| 859 _type = (DepType)(end_marker-1); // defeat "already at end" assert | |
| 860 assert((_code!=NULL) + (_deps!=NULL) == 1, "one or t'other"); | |
| 861 } | |
| 862 #endif //ASSERT | |
| 863 | |
| 864 bool Dependencies::DepStream::next() { | |
| 865 assert(_type != end_marker, "already at end"); | |
| 866 if (_bytes.position() == 0 && _code != NULL | |
| 867 && _code->dependencies_size() == 0) { | |
| 868 // Method has no dependencies at all. | |
| 869 return false; | |
| 870 } | |
| 871 int code_byte = (_bytes.read_byte() & 0xFF); | |
| 872 if (code_byte == end_marker) { | |
| 873 DEBUG_ONLY(_type = end_marker); | |
| 874 return false; | |
| 875 } else { | |
| 876 int ctxk_bit = (code_byte & Dependencies::default_context_type_bit); | |
| 877 code_byte -= ctxk_bit; | |
| 878 DepType dept = (DepType)code_byte; | |
| 879 _type = dept; | |
|
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880 Dependencies::check_valid_dependency_type(dept); |
| 0 | 881 int stride = _dep_args[dept]; |
| 882 assert(stride == dep_args(dept), "sanity"); | |
| 883 int skipj = -1; | |
| 884 if (ctxk_bit != 0) { | |
| 885 skipj = 0; // currently the only context argument is at zero | |
| 886 assert(skipj == dep_context_arg(dept), "zero arg always ctxk"); | |
| 887 } | |
| 888 for (int j = 0; j < stride; j++) { | |
| 889 _xi[j] = (j == skipj)? 0: _bytes.read_int(); | |
| 890 } | |
| 891 DEBUG_ONLY(_xi[stride] = -1); // help detect overruns | |
| 892 return true; | |
| 893 } | |
| 894 } | |
| 895 | |
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896 inline Metadata* Dependencies::DepStream::recorded_metadata_at(int i) { |
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897 Metadata* o = NULL; |
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898 if (_code != NULL) { |
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899 o = _code->metadata_at(i); |
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900 } else { |
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901 o = _deps->oop_recorder()->metadata_at(i); |
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902 } |
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903 return o; |
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904 } |
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905 |
| 0 | 906 inline oop Dependencies::DepStream::recorded_oop_at(int i) { |
| 907 return (_code != NULL) | |
| 908 ? _code->oop_at(i) | |
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909 : JNIHandles::resolve(_deps->oop_recorder()->oop_at(i)); |
| 0 | 910 } |
| 911 | |
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912 Metadata* Dependencies::DepStream::argument(int i) { |
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913 Metadata* result = recorded_metadata_at(argument_index(i)); |
|
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914 |
|
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915 if (result == NULL) { // Explicit context argument can be compressed |
|
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916 int ctxkj = dep_context_arg(type()); // -1 if no explicit context arg |
|
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917 if (ctxkj >= 0 && i == ctxkj && ctxkj+1 < argument_count()) { |
|
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918 result = ctxk_encoded_as_null(type(), argument(ctxkj+1)); |
|
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919 } |
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920 } |
|
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921 |
|
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922 assert(result == NULL || result->is_klass() || result->is_method(), "must be"); |
|
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923 return result; |
| 0 | 924 } |
| 925 | |
|
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926 oop Dependencies::DepStream::argument_oop(int i) { |
|
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927 oop result = recorded_oop_at(argument_index(i)); |
|
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928 assert(result == NULL || result->is_oop(), "must be"); |
|
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929 return result; |
|
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930 } |
|
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931 |
|
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932 Klass* Dependencies::DepStream::context_type() { |
| 0 | 933 assert(must_be_in_vm(), "raw oops here"); |
|
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934 |
|
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935 // Most dependencies have an explicit context type argument. |
|
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936 { |
|
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937 int ctxkj = dep_context_arg(type()); // -1 if no explicit context arg |
|
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938 if (ctxkj >= 0) { |
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939 Metadata* k = argument(ctxkj); |
|
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940 assert(k != NULL && k->is_klass(), "type check"); |
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941 return (Klass*)k; |
|
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942 } |
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943 } |
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944 |
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945 // Some dependencies are using the klass of the first object |
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946 // argument as implicit context type (e.g. call_site_target_value). |
|
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947 { |
|
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948 int ctxkj = dep_implicit_context_arg(type()); |
|
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949 if (ctxkj >= 0) { |
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950 Klass* k = argument_oop(ctxkj)->klass(); |
|
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951 assert(k != NULL && k->is_klass(), "type check"); |
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952 return (Klass*) k; |
| 0 | 953 } |
| 954 } | |
|
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955 |
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956 // And some dependencies don't have a context type at all, |
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957 // e.g. evol_method. |
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958 return NULL; |
| 0 | 959 } |
| 960 | |
| 961 /// Checking dependencies: | |
| 962 | |
| 963 // This hierarchy walker inspects subtypes of a given type, | |
| 964 // trying to find a "bad" class which breaks a dependency. | |
| 965 // Such a class is called a "witness" to the broken dependency. | |
| 966 // While searching around, we ignore "participants", which | |
| 967 // are already known to the dependency. | |
| 968 class ClassHierarchyWalker { | |
| 969 public: | |
| 970 enum { PARTICIPANT_LIMIT = 3 }; | |
| 971 | |
| 972 private: | |
| 973 // optional method descriptor to check for: | |
|
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974 Symbol* _name; |
|
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975 Symbol* _signature; |
| 0 | 976 |
| 977 // special classes which are not allowed to be witnesses: | |
|
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978 Klass* _participants[PARTICIPANT_LIMIT+1]; |
| 0 | 979 int _num_participants; |
| 980 | |
| 981 // cache of method lookups | |
|
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982 Method* _found_methods[PARTICIPANT_LIMIT+1]; |
| 0 | 983 |
| 984 // if non-zero, tells how many witnesses to convert to participants | |
| 985 int _record_witnesses; | |
| 986 | |
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987 void initialize(Klass* participant) { |
| 0 | 988 _record_witnesses = 0; |
| 989 _participants[0] = participant; | |
| 990 _found_methods[0] = NULL; | |
| 991 _num_participants = 0; | |
| 992 if (participant != NULL) { | |
| 993 // Terminating NULL. | |
| 994 _participants[1] = NULL; | |
| 995 _found_methods[1] = NULL; | |
| 996 _num_participants = 1; | |
| 997 } | |
| 998 } | |
| 999 | |
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1000 void initialize_from_method(Method* m) { |
| 0 | 1001 assert(m != NULL && m->is_method(), "sanity"); |
| 1002 _name = m->name(); | |
| 1003 _signature = m->signature(); | |
| 1004 } | |
| 1005 | |
| 1006 public: | |
| 1007 // The walker is initialized to recognize certain methods and/or types | |
| 1008 // as friendly participants. | |
|
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1009 ClassHierarchyWalker(Klass* participant, Method* m) { |
| 0 | 1010 initialize_from_method(m); |
| 1011 initialize(participant); | |
| 1012 } | |
|
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1013 ClassHierarchyWalker(Method* m) { |
| 0 | 1014 initialize_from_method(m); |
| 1015 initialize(NULL); | |
| 1016 } | |
|
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1017 ClassHierarchyWalker(Klass* participant = NULL) { |
| 0 | 1018 _name = NULL; |
| 1019 _signature = NULL; | |
| 1020 initialize(participant); | |
| 1021 } | |
| 1022 | |
| 1023 // This is common code for two searches: One for concrete subtypes, | |
| 1024 // the other for concrete method implementations and overrides. | |
| 1025 bool doing_subtype_search() { | |
| 1026 return _name == NULL; | |
| 1027 } | |
| 1028 | |
| 1029 int num_participants() { return _num_participants; } | |
|
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1030 Klass* participant(int n) { |
| 0 | 1031 assert((uint)n <= (uint)_num_participants, "oob"); |
| 1032 return _participants[n]; | |
| 1033 } | |
| 1034 | |
| 1035 // Note: If n==num_participants, returns NULL. | |
|
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1036 Method* found_method(int n) { |
| 0 | 1037 assert((uint)n <= (uint)_num_participants, "oob"); |
|
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1038 Method* fm = _found_methods[n]; |
| 0 | 1039 assert(n == _num_participants || fm != NULL, "proper usage"); |
|
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1040 if (fm != NULL && fm->method_holder() != _participants[n]) { |
|
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1041 // Default methods from interfaces can be added to classes. In |
|
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1042 // that case the holder of the method is not the class but the |
|
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1043 // interface where it's defined. |
|
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1044 assert(fm->is_default_method(), "sanity"); |
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1045 return NULL; |
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1046 } |
| 0 | 1047 return fm; |
| 1048 } | |
| 1049 | |
| 1050 #ifdef ASSERT | |
| 1051 // Assert that m is inherited into ctxk, without intervening overrides. | |
| 1052 // (May return true even if this is not true, in corner cases where we punt.) | |
|
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1053 bool check_method_context(Klass* ctxk, Method* m) { |
| 0 | 1054 if (m->method_holder() == ctxk) |
| 1055 return true; // Quick win. | |
| 1056 if (m->is_private()) | |
| 1057 return false; // Quick lose. Should not happen. | |
| 1058 if (!(m->is_public() || m->is_protected())) | |
| 1059 // The override story is complex when packages get involved. | |
| 1060 return true; // Must punt the assertion to true. | |
|
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1061 Method* lm = ctxk->lookup_method(m->name(), m->signature()); |
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1062 if (lm == NULL && ctxk->oop_is_instance()) { |
|
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1063 // It might be an interface method |
|
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1064 lm = ((InstanceKlass*)ctxk)->lookup_method_in_ordered_interfaces(m->name(), |
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1065 m->signature()); |
| 0 | 1066 } |
| 1067 if (lm == m) | |
| 1068 // Method m is inherited into ctxk. | |
| 1069 return true; | |
| 1070 if (lm != NULL) { | |
| 4060 | 1071 if (!(lm->is_public() || lm->is_protected())) { |
| 0 | 1072 // Method is [package-]private, so the override story is complex. |
| 1073 return true; // Must punt the assertion to true. | |
| 4060 | 1074 } |
| 1075 if (lm->is_static()) { | |
| 1076 // Static methods don't override non-static so punt | |
| 1077 return true; | |
| 1078 } | |
|
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1079 if (!Dependencies::is_concrete_method(lm, ctxk) && |
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1080 !Dependencies::is_concrete_method(m, ctxk)) { |
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1081 // They are both non-concrete |
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1082 if (lm->method_holder()->is_subtype_of(m->method_holder())) { |
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1083 // Method m is overridden by lm, but both are non-concrete. |
|
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1084 return true; |
|
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1085 } |
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1086 if (lm->method_holder()->is_interface() && m->method_holder()->is_interface() && |
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1087 ctxk->is_subtype_of(m->method_holder()) && ctxk->is_subtype_of(lm->method_holder())) { |
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1088 // Interface method defined in multiple super interfaces |
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1089 return true; |
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1090 } |
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|
1091 } |
| 0 | 1092 } |
| 1093 ResourceMark rm; | |
| 1094 tty->print_cr("Dependency method not found in the associated context:"); | |
| 6983 | 1095 tty->print_cr(" context = %s", ctxk->external_name()); |
| 0 | 1096 tty->print( " method = "); m->print_short_name(tty); tty->cr(); |
| 1097 if (lm != NULL) { | |
| 1098 tty->print( " found = "); lm->print_short_name(tty); tty->cr(); | |
| 1099 } | |
| 1100 return false; | |
| 1101 } | |
| 1102 #endif | |
| 1103 | |
|
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1104 void add_participant(Klass* participant) { |
| 0 | 1105 assert(_num_participants + _record_witnesses < PARTICIPANT_LIMIT, "oob"); |
| 1106 int np = _num_participants++; | |
| 1107 _participants[np] = participant; | |
| 1108 _participants[np+1] = NULL; | |
| 1109 _found_methods[np+1] = NULL; | |
| 1110 } | |
| 1111 | |
| 1112 void record_witnesses(int add) { | |
| 1113 if (add > PARTICIPANT_LIMIT) add = PARTICIPANT_LIMIT; | |
| 1114 assert(_num_participants + add < PARTICIPANT_LIMIT, "oob"); | |
| 1115 _record_witnesses = add; | |
| 1116 } | |
| 1117 | |
|
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1118 bool is_witness(Klass* k) { |
| 0 | 1119 if (doing_subtype_search()) { |
| 1120 return Dependencies::is_concrete_klass(k); | |
|
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1121 } else if (!k->oop_is_instance()) { |
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1122 return false; // no methods to find in an array type |
| 0 | 1123 } else { |
| 20785 | 1124 // Search class hierarchy first. |
| 1125 Method* m = InstanceKlass::cast(k)->find_instance_method(_name, _signature); | |
| 1126 if (!Dependencies::is_concrete_method(m, k)) { | |
| 1127 // Check interface defaults also, if any exist. | |
| 1128 Array<Method*>* default_methods = InstanceKlass::cast(k)->default_methods(); | |
| 1129 if (default_methods == NULL) | |
| 1130 return false; | |
| 1131 m = InstanceKlass::cast(k)->find_method(default_methods, _name, _signature); | |
| 1132 if (!Dependencies::is_concrete_method(m, NULL)) | |
| 1133 return false; | |
| 1134 } | |
| 0 | 1135 _found_methods[_num_participants] = m; |
| 1136 // Note: If add_participant(k) is called, | |
| 1137 // the method m will already be memoized for it. | |
| 1138 return true; | |
| 1139 } | |
| 1140 } | |
| 1141 | |
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1142 bool is_participant(Klass* k) { |
| 0 | 1143 if (k == _participants[0]) { |
| 1144 return true; | |
| 1145 } else if (_num_participants <= 1) { | |
| 1146 return false; | |
| 1147 } else { | |
| 1148 return in_list(k, &_participants[1]); | |
| 1149 } | |
| 1150 } | |
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1151 bool ignore_witness(Klass* witness) { |
| 0 | 1152 if (_record_witnesses == 0) { |
| 1153 return false; | |
| 1154 } else { | |
| 1155 --_record_witnesses; | |
| 1156 add_participant(witness); | |
| 1157 return true; | |
| 1158 } | |
| 1159 } | |
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1160 static bool in_list(Klass* x, Klass** list) { |
| 0 | 1161 for (int i = 0; ; i++) { |
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1162 Klass* y = list[i]; |
| 0 | 1163 if (y == NULL) break; |
| 1164 if (y == x) return true; | |
| 1165 } | |
| 1166 return false; // not in list | |
| 1167 } | |
| 1168 | |
| 1169 private: | |
| 1170 // the actual search method: | |
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1171 Klass* find_witness_anywhere(Klass* context_type, |
| 0 | 1172 bool participants_hide_witnesses, |
| 1173 bool top_level_call = true); | |
| 1174 // the spot-checking version: | |
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1175 Klass* find_witness_in(KlassDepChange& changes, |
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1176 Klass* context_type, |
| 0 | 1177 bool participants_hide_witnesses); |
| 1178 public: | |
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1179 Klass* find_witness_subtype(Klass* context_type, KlassDepChange* changes = NULL) { |
| 0 | 1180 assert(doing_subtype_search(), "must set up a subtype search"); |
| 1181 // When looking for unexpected concrete types, | |
| 1182 // do not look beneath expected ones. | |
| 1183 const bool participants_hide_witnesses = true; | |
| 1184 // CX > CC > C' is OK, even if C' is new. | |
| 1185 // CX > { CC, C' } is not OK if C' is new, and C' is the witness. | |
| 1186 if (changes != NULL) { | |
| 1187 return find_witness_in(*changes, context_type, participants_hide_witnesses); | |
| 1188 } else { | |
| 1189 return find_witness_anywhere(context_type, participants_hide_witnesses); | |
| 1190 } | |
| 1191 } | |
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1192 Klass* find_witness_definer(Klass* context_type, KlassDepChange* changes = NULL) { |
| 0 | 1193 assert(!doing_subtype_search(), "must set up a method definer search"); |
| 1194 // When looking for unexpected concrete methods, | |
| 1195 // look beneath expected ones, to see if there are overrides. | |
| 1196 const bool participants_hide_witnesses = true; | |
| 1197 // CX.m > CC.m > C'.m is not OK, if C'.m is new, and C' is the witness. | |
| 1198 if (changes != NULL) { | |
| 1199 return find_witness_in(*changes, context_type, !participants_hide_witnesses); | |
| 1200 } else { | |
| 1201 return find_witness_anywhere(context_type, !participants_hide_witnesses); | |
| 1202 } | |
| 1203 } | |
| 1204 }; | |
| 1205 | |
| 1206 #ifndef PRODUCT | |
| 1207 static int deps_find_witness_calls = 0; | |
| 1208 static int deps_find_witness_steps = 0; | |
| 1209 static int deps_find_witness_recursions = 0; | |
| 1210 static int deps_find_witness_singles = 0; | |
| 1211 static int deps_find_witness_print = 0; // set to -1 to force a final print | |
| 1212 static bool count_find_witness_calls() { | |
| 1213 if (TraceDependencies || LogCompilation) { | |
| 1214 int pcount = deps_find_witness_print + 1; | |
| 1215 bool final_stats = (pcount == 0); | |
| 1216 bool initial_call = (pcount == 1); | |
| 1217 bool occasional_print = ((pcount & ((1<<10) - 1)) == 0); | |
| 1218 if (pcount < 0) pcount = 1; // crude overflow protection | |
| 1219 deps_find_witness_print = pcount; | |
| 1220 if (VerifyDependencies && initial_call) { | |
| 1221 tty->print_cr("Warning: TraceDependencies results may be inflated by VerifyDependencies"); | |
| 1222 } | |
| 1223 if (occasional_print || final_stats) { | |
| 1224 // Every now and then dump a little info about dependency searching. | |
| 1225 if (xtty != NULL) { | |
|
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1226 ttyLocker ttyl; |
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1227 xtty->elem("deps_find_witness calls='%d' steps='%d' recursions='%d' singles='%d'", |
| 0 | 1228 deps_find_witness_calls, |
| 1229 deps_find_witness_steps, | |
| 1230 deps_find_witness_recursions, | |
| 1231 deps_find_witness_singles); | |
| 1232 } | |
| 1233 if (final_stats || (TraceDependencies && WizardMode)) { | |
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1234 ttyLocker ttyl; |
| 0 | 1235 tty->print_cr("Dependency check (find_witness) " |
| 1236 "calls=%d, steps=%d (avg=%.1f), recursions=%d, singles=%d", | |
| 1237 deps_find_witness_calls, | |
| 1238 deps_find_witness_steps, | |
| 1239 (double)deps_find_witness_steps / deps_find_witness_calls, | |
| 1240 deps_find_witness_recursions, | |
| 1241 deps_find_witness_singles); | |
| 1242 } | |
| 1243 } | |
| 1244 return true; | |
| 1245 } | |
| 1246 return false; | |
| 1247 } | |
| 1248 #else | |
| 1249 #define count_find_witness_calls() (0) | |
| 1250 #endif //PRODUCT | |
| 1251 | |
| 1252 | |
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1253 Klass* ClassHierarchyWalker::find_witness_in(KlassDepChange& changes, |
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1254 Klass* context_type, |
| 0 | 1255 bool participants_hide_witnesses) { |
| 1256 assert(changes.involves_context(context_type), "irrelevant dependency"); | |
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1257 Klass* new_type = changes.new_type(); |
| 0 | 1258 |
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1259 (void)count_find_witness_calls(); |
| 0 | 1260 NOT_PRODUCT(deps_find_witness_singles++); |
| 1261 | |
| 1262 // Current thread must be in VM (not native mode, as in CI): | |
| 1263 assert(must_be_in_vm(), "raw oops here"); | |
| 1264 // Must not move the class hierarchy during this check: | |
| 1265 assert_locked_or_safepoint(Compile_lock); | |
| 1266 | |
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1267 int nof_impls = InstanceKlass::cast(context_type)->nof_implementors(); |
| 30 | 1268 if (nof_impls > 1) { |
| 1269 // Avoid this case: *I.m > { A.m, C }; B.m > C | |
| 1270 // %%% Until this is fixed more systematically, bail out. | |
| 1271 // See corresponding comment in find_witness_anywhere. | |
| 1272 return context_type; | |
| 1273 } | |
| 1274 | |
| 0 | 1275 assert(!is_participant(new_type), "only old classes are participants"); |
| 1276 if (participants_hide_witnesses) { | |
| 1277 // If the new type is a subtype of a participant, we are done. | |
| 1278 for (int i = 0; i < num_participants(); i++) { | |
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1279 Klass* part = participant(i); |
| 0 | 1280 if (part == NULL) continue; |
| 6983 | 1281 assert(changes.involves_context(part) == new_type->is_subtype_of(part), |
| 0 | 1282 "correct marking of participants, b/c new_type is unique"); |
| 1283 if (changes.involves_context(part)) { | |
| 1284 // new guy is protected from this check by previous participant | |
| 1285 return NULL; | |
| 1286 } | |
| 1287 } | |
| 1288 } | |
| 1289 | |
| 1290 if (is_witness(new_type) && | |
| 1291 !ignore_witness(new_type)) { | |
| 1292 return new_type; | |
| 1293 } | |
| 1294 | |
| 1295 return NULL; | |
| 1296 } | |
| 1297 | |
| 1298 | |
| 1299 // Walk hierarchy under a context type, looking for unexpected types. | |
| 1300 // Do not report participant types, and recursively walk beneath | |
| 1301 // them only if participants_hide_witnesses is false. | |
| 1302 // If top_level_call is false, skip testing the context type, | |
| 1303 // because the caller has already considered it. | |
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1304 Klass* ClassHierarchyWalker::find_witness_anywhere(Klass* context_type, |
| 0 | 1305 bool participants_hide_witnesses, |
| 1306 bool top_level_call) { | |
| 1307 // Current thread must be in VM (not native mode, as in CI): | |
| 1308 assert(must_be_in_vm(), "raw oops here"); | |
| 1309 // Must not move the class hierarchy during this check: | |
| 1310 assert_locked_or_safepoint(Compile_lock); | |
| 1311 | |
| 1312 bool do_counts = count_find_witness_calls(); | |
| 1313 | |
| 1314 // Check the root of the sub-hierarchy first. | |
| 1315 if (top_level_call) { | |
| 1316 if (do_counts) { | |
| 1317 NOT_PRODUCT(deps_find_witness_calls++); | |
| 1318 NOT_PRODUCT(deps_find_witness_steps++); | |
| 1319 } | |
| 1320 if (is_participant(context_type)) { | |
| 1321 if (participants_hide_witnesses) return NULL; | |
| 1322 // else fall through to search loop... | |
| 1323 } else if (is_witness(context_type) && !ignore_witness(context_type)) { | |
| 1324 // The context is an abstract class or interface, to start with. | |
| 1325 return context_type; | |
| 1326 } | |
| 1327 } | |
| 1328 | |
| 1329 // Now we must check each implementor and each subclass. | |
| 1330 // Use a short worklist to avoid blowing the stack. | |
| 1331 // Each worklist entry is a *chain* of subklass siblings to process. | |
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1332 const int CHAINMAX = 100; // >= 1 + InstanceKlass::implementors_limit |
| 0 | 1333 Klass* chains[CHAINMAX]; |
| 1334 int chaini = 0; // index into worklist | |
| 1335 Klass* chain; // scratch variable | |
| 1336 #define ADD_SUBCLASS_CHAIN(k) { \ | |
| 1337 assert(chaini < CHAINMAX, "oob"); \ | |
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1338 chain = k->subklass(); \ |
| 0 | 1339 if (chain != NULL) chains[chaini++] = chain; } |
| 1340 | |
| 1341 // Look for non-abstract subclasses. | |
| 1342 // (Note: Interfaces do not have subclasses.) | |
| 1343 ADD_SUBCLASS_CHAIN(context_type); | |
| 1344 | |
| 1345 // If it is an interface, search its direct implementors. | |
| 1346 // (Their subclasses are additional indirect implementors. | |
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1347 // See InstanceKlass::add_implementor.) |
| 0 | 1348 // (Note: nof_implementors is always zero for non-interfaces.) |
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1349 if (top_level_call) { |
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1350 int nof_impls = InstanceKlass::cast(context_type)->nof_implementors(); |
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1351 if (nof_impls > 1) { |
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1352 // Avoid this case: *I.m > { A.m, C }; B.m > C |
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1353 // Here, I.m has 2 concrete implementations, but m appears unique |
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1354 // as A.m, because the search misses B.m when checking C. |
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1355 // The inherited method B.m was getting missed by the walker |
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1356 // when interface 'I' was the starting point. |
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1357 // %%% Until this is fixed more systematically, bail out. |
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1358 // (Old CHA had the same limitation.) |
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1359 return context_type; |
| 0 | 1360 } |
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1361 if (nof_impls > 0) { |
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1362 Klass* impl = InstanceKlass::cast(context_type)->implementor(); |
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1363 assert(impl != NULL, "just checking"); |
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1364 // If impl is the same as the context_type, then more than one |
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1365 // implementor has seen. No exact info in this case. |
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1366 if (impl == context_type) { |
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1367 return context_type; // report an inexact witness to this sad affair |
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1368 } |
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1369 if (do_counts) |
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1370 { NOT_PRODUCT(deps_find_witness_steps++); } |
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1371 if (is_participant(impl)) { |
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1372 if (!participants_hide_witnesses) { |
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1373 ADD_SUBCLASS_CHAIN(impl); |
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1374 } |
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1375 } else if (is_witness(impl) && !ignore_witness(impl)) { |
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1376 return impl; |
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1377 } else { |
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1378 ADD_SUBCLASS_CHAIN(impl); |
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1379 } |
| 0 | 1380 } |
| 1381 } | |
| 1382 | |
| 1383 // Recursively process each non-trivial sibling chain. | |
| 1384 while (chaini > 0) { | |
| 1385 Klass* chain = chains[--chaini]; | |
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1386 for (Klass* sub = chain; sub != NULL; sub = sub->next_sibling()) { |
| 0 | 1387 if (do_counts) { NOT_PRODUCT(deps_find_witness_steps++); } |
| 1388 if (is_participant(sub)) { | |
| 1389 if (participants_hide_witnesses) continue; | |
| 1390 // else fall through to process this guy's subclasses | |
| 1391 } else if (is_witness(sub) && !ignore_witness(sub)) { | |
| 1392 return sub; | |
| 1393 } | |
| 1394 if (chaini < (VerifyDependencies? 2: CHAINMAX)) { | |
| 1395 // Fast path. (Partially disabled if VerifyDependencies.) | |
| 1396 ADD_SUBCLASS_CHAIN(sub); | |
| 1397 } else { | |
| 1398 // Worklist overflow. Do a recursive call. Should be rare. | |
| 1399 // The recursive call will have its own worklist, of course. | |
| 1400 // (Note that sub has already been tested, so that there is | |
| 1401 // no need for the recursive call to re-test. That's handy, | |
| 1402 // since the recursive call sees sub as the context_type.) | |
| 1403 if (do_counts) { NOT_PRODUCT(deps_find_witness_recursions++); } | |
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1404 Klass* witness = find_witness_anywhere(sub, |
| 0 | 1405 participants_hide_witnesses, |
| 1406 /*top_level_call=*/ false); | |
| 1407 if (witness != NULL) return witness; | |
| 1408 } | |
| 1409 } | |
| 1410 } | |
| 1411 | |
| 1412 // No witness found. The dependency remains unbroken. | |
| 1413 return NULL; | |
| 1414 #undef ADD_SUBCLASS_CHAIN | |
| 1415 } | |
| 1416 | |
| 1417 | |
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1418 bool Dependencies::is_concrete_klass(Klass* k) { |
| 6983 | 1419 if (k->is_abstract()) return false; |
| 0 | 1420 // %%% We could treat classes which are concrete but |
| 1421 // have not yet been instantiated as virtually abstract. | |
| 1422 // This would require a deoptimization barrier on first instantiation. | |
| 1423 //if (k->is_not_instantiated()) return false; | |
| 1424 return true; | |
| 1425 } | |
| 1426 | |
| 20785 | 1427 bool Dependencies::is_concrete_method(Method* m, Klass * k) { |
| 1428 // NULL is not a concrete method, | |
| 1429 // statics are irrelevant to virtual call sites, | |
| 1430 // abstract methods are not concrete, | |
| 1431 // overpass (error) methods are not concrete if k is abstract | |
| 1432 // | |
| 1433 // note "true" is conservative answer -- | |
| 1434 // overpass clause is false if k == NULL, implies return true if | |
| 1435 // answer depends on overpass clause. | |
| 1436 return ! ( m == NULL || m -> is_static() || m -> is_abstract() || | |
| 1437 m->is_overpass() && k != NULL && k -> is_abstract() ); | |
| 0 | 1438 } |
| 1439 | |
| 1440 | |
| 1441 Klass* Dependencies::find_finalizable_subclass(Klass* k) { | |
| 1442 if (k->is_interface()) return NULL; | |
| 1443 if (k->has_finalizer()) return k; | |
| 1444 k = k->subklass(); | |
| 1445 while (k != NULL) { | |
| 1446 Klass* result = find_finalizable_subclass(k); | |
| 1447 if (result != NULL) return result; | |
| 1448 k = k->next_sibling(); | |
| 1449 } | |
| 1450 return NULL; | |
| 1451 } | |
| 1452 | |
| 1453 | |
| 1454 bool Dependencies::is_concrete_klass(ciInstanceKlass* k) { | |
| 1455 if (k->is_abstract()) return false; | |
| 4060 | 1456 // We could also return false if k does not yet appear to be |
| 0 | 1457 // instantiated, if the VM version supports this distinction also. |
| 1458 //if (k->is_not_instantiated()) return false; | |
| 1459 return true; | |
| 1460 } | |
| 1461 | |
| 1462 bool Dependencies::has_finalizable_subclass(ciInstanceKlass* k) { | |
| 1463 return k->has_finalizable_subclass(); | |
| 1464 } | |
| 1465 | |
| 1466 | |
| 1467 // Any use of the contents (bytecodes) of a method must be | |
| 1468 // marked by an "evol_method" dependency, if those contents | |
| 1469 // can change. (Note: A method is always dependent on itself.) | |
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1470 Klass* Dependencies::check_evol_method(Method* m) { |
| 0 | 1471 assert(must_be_in_vm(), "raw oops here"); |
| 1472 // Did somebody do a JVMTI RedefineClasses while our backs were turned? | |
| 1473 // Or is there a now a breakpoint? | |
| 1474 // (Assumes compiled code cannot handle bkpts; change if UseFastBreakpoints.) | |
| 1475 if (m->is_old() | |
| 1476 || m->number_of_breakpoints() > 0) { | |
| 1477 return m->method_holder(); | |
| 1478 } else { | |
| 1479 return NULL; | |
| 1480 } | |
| 1481 } | |
| 1482 | |
| 1483 // This is a strong assertion: It is that the given type | |
| 1484 // has no subtypes whatever. It is most useful for | |
| 1485 // optimizing checks on reflected types or on array types. | |
| 1486 // (Checks on types which are derived from real instances | |
| 1487 // can be optimized more strongly than this, because we | |
| 1488 // know that the checked type comes from a concrete type, | |
| 1489 // and therefore we can disregard abstract types.) | |
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1490 Klass* Dependencies::check_leaf_type(Klass* ctxk) { |
| 0 | 1491 assert(must_be_in_vm(), "raw oops here"); |
| 1492 assert_locked_or_safepoint(Compile_lock); | |
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1493 InstanceKlass* ctx = InstanceKlass::cast(ctxk); |
| 0 | 1494 Klass* sub = ctx->subklass(); |
| 1495 if (sub != NULL) { | |
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1496 return sub; |
| 0 | 1497 } else if (ctx->nof_implementors() != 0) { |
| 1498 // if it is an interface, it must be unimplemented | |
| 1499 // (if it is not an interface, nof_implementors is always zero) | |
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1500 Klass* impl = ctx->implementor(); |
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1501 assert(impl != NULL, "must be set"); |
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1502 return impl; |
| 0 | 1503 } else { |
| 1504 return NULL; | |
| 1505 } | |
| 1506 } | |
| 1507 | |
| 1508 // Test the assertion that conck is the only concrete subtype* of ctxk. | |
| 1509 // The type conck itself is allowed to have have further concrete subtypes. | |
| 1510 // This allows the compiler to narrow occurrences of ctxk by conck, | |
| 1511 // when dealing with the types of actual instances. | |
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1512 Klass* Dependencies::check_abstract_with_unique_concrete_subtype(Klass* ctxk, |
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1513 Klass* conck, |
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1514 KlassDepChange* changes) { |
| 0 | 1515 ClassHierarchyWalker wf(conck); |
| 1516 return wf.find_witness_subtype(ctxk, changes); | |
| 1517 } | |
| 1518 | |
| 1519 // If a non-concrete class has no concrete subtypes, it is not (yet) | |
| 1520 // instantiatable. This can allow the compiler to make some paths go | |
| 1521 // dead, if they are gated by a test of the type. | |
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1522 Klass* Dependencies::check_abstract_with_no_concrete_subtype(Klass* ctxk, |
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1523 KlassDepChange* changes) { |
| 0 | 1524 // Find any concrete subtype, with no participants: |
| 1525 ClassHierarchyWalker wf; | |
| 1526 return wf.find_witness_subtype(ctxk, changes); | |
| 1527 } | |
| 1528 | |
| 1529 | |
| 1530 // If a concrete class has no concrete subtypes, it can always be | |
| 1531 // exactly typed. This allows the use of a cheaper type test. | |
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1532 Klass* Dependencies::check_concrete_with_no_concrete_subtype(Klass* ctxk, |
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1533 KlassDepChange* changes) { |
| 0 | 1534 // Find any concrete subtype, with only the ctxk as participant: |
| 1535 ClassHierarchyWalker wf(ctxk); | |
| 1536 return wf.find_witness_subtype(ctxk, changes); | |
| 1537 } | |
| 1538 | |
| 1539 | |
| 1540 // Find the unique concrete proper subtype of ctxk, or NULL if there | |
| 1541 // is more than one concrete proper subtype. If there are no concrete | |
| 1542 // proper subtypes, return ctxk itself, whether it is concrete or not. | |
| 1543 // The returned subtype is allowed to have have further concrete subtypes. | |
| 1544 // That is, return CC1 for CX > CC1 > CC2, but NULL for CX > { CC1, CC2 }. | |
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1545 Klass* Dependencies::find_unique_concrete_subtype(Klass* ctxk) { |
| 0 | 1546 ClassHierarchyWalker wf(ctxk); // Ignore ctxk when walking. |
| 1547 wf.record_witnesses(1); // Record one other witness when walking. | |
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1548 Klass* wit = wf.find_witness_subtype(ctxk); |
| 0 | 1549 if (wit != NULL) return NULL; // Too many witnesses. |
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1550 Klass* conck = wf.participant(0); |
| 0 | 1551 if (conck == NULL) { |
| 1552 #ifndef PRODUCT | |
| 1553 // Make sure the dependency mechanism will pass this discovery: | |
| 1554 if (VerifyDependencies) { | |
| 1555 // Turn off dependency tracing while actually testing deps. | |
| 1556 FlagSetting fs(TraceDependencies, false); | |
| 1557 if (!Dependencies::is_concrete_klass(ctxk)) { | |
| 1558 guarantee(NULL == | |
| 1559 (void *)check_abstract_with_no_concrete_subtype(ctxk), | |
| 1560 "verify dep."); | |
| 1561 } else { | |
| 1562 guarantee(NULL == | |
| 1563 (void *)check_concrete_with_no_concrete_subtype(ctxk), | |
| 1564 "verify dep."); | |
| 1565 } | |
| 1566 } | |
| 1567 #endif //PRODUCT | |
| 1568 return ctxk; // Return ctxk as a flag for "no subtypes". | |
| 1569 } else { | |
| 1570 #ifndef PRODUCT | |
| 1571 // Make sure the dependency mechanism will pass this discovery: | |
| 1572 if (VerifyDependencies) { | |
| 1573 // Turn off dependency tracing while actually testing deps. | |
| 1574 FlagSetting fs(TraceDependencies, false); | |
| 1575 if (!Dependencies::is_concrete_klass(ctxk)) { | |
| 1576 guarantee(NULL == (void *) | |
| 1577 check_abstract_with_unique_concrete_subtype(ctxk, conck), | |
| 1578 "verify dep."); | |
| 1579 } | |
| 1580 } | |
| 1581 #endif //PRODUCT | |
| 1582 return conck; | |
| 1583 } | |
| 1584 } | |
| 1585 | |
| 1586 // Test the assertion that the k[12] are the only concrete subtypes of ctxk, | |
| 1587 // except possibly for further subtypes of k[12] themselves. | |
| 1588 // The context type must be abstract. The types k1 and k2 are themselves | |
| 1589 // allowed to have further concrete subtypes. | |
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1590 Klass* Dependencies::check_abstract_with_exclusive_concrete_subtypes( |
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1591 Klass* ctxk, |
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1592 Klass* k1, |
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1593 Klass* k2, |
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1594 KlassDepChange* changes) { |
| 0 | 1595 ClassHierarchyWalker wf; |
| 1596 wf.add_participant(k1); | |
| 1597 wf.add_participant(k2); | |
| 1598 return wf.find_witness_subtype(ctxk, changes); | |
| 1599 } | |
| 1600 | |
| 1601 // Search ctxk for concrete implementations. If there are klen or fewer, | |
| 1602 // pack them into the given array and return the number. | |
| 1603 // Otherwise, return -1, meaning the given array would overflow. | |
| 1604 // (Note that a return of 0 means there are exactly no concrete subtypes.) | |
| 1605 // In this search, if ctxk is concrete, it will be reported alone. | |
| 1606 // For any type CC reported, no proper subtypes of CC will be reported. | |
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1607 int Dependencies::find_exclusive_concrete_subtypes(Klass* ctxk, |
| 0 | 1608 int klen, |
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1609 Klass* karray[]) { |
| 0 | 1610 ClassHierarchyWalker wf; |
| 1611 wf.record_witnesses(klen); | |
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1612 Klass* wit = wf.find_witness_subtype(ctxk); |
| 0 | 1613 if (wit != NULL) return -1; // Too many witnesses. |
| 1614 int num = wf.num_participants(); | |
| 1615 assert(num <= klen, "oob"); | |
| 1616 // Pack the result array with the good news. | |
| 1617 for (int i = 0; i < num; i++) | |
| 1618 karray[i] = wf.participant(i); | |
| 1619 #ifndef PRODUCT | |
| 1620 // Make sure the dependency mechanism will pass this discovery: | |
| 1621 if (VerifyDependencies) { | |
| 1622 // Turn off dependency tracing while actually testing deps. | |
| 1623 FlagSetting fs(TraceDependencies, false); | |
| 1624 switch (Dependencies::is_concrete_klass(ctxk)? -1: num) { | |
| 1625 case -1: // ctxk was itself concrete | |
| 1626 guarantee(num == 1 && karray[0] == ctxk, "verify dep."); | |
| 1627 break; | |
| 1628 case 0: | |
| 1629 guarantee(NULL == (void *)check_abstract_with_no_concrete_subtype(ctxk), | |
| 1630 "verify dep."); | |
| 1631 break; | |
| 1632 case 1: | |
| 1633 guarantee(NULL == (void *) | |
| 1634 check_abstract_with_unique_concrete_subtype(ctxk, karray[0]), | |
| 1635 "verify dep."); | |
| 1636 break; | |
| 1637 case 2: | |
| 1638 guarantee(NULL == (void *) | |
| 1639 check_abstract_with_exclusive_concrete_subtypes(ctxk, | |
| 1640 karray[0], | |
| 1641 karray[1]), | |
| 1642 "verify dep."); | |
| 1643 break; | |
| 1644 default: | |
| 1645 ShouldNotReachHere(); // klen > 2 yet supported | |
| 1646 } | |
| 1647 } | |
| 1648 #endif //PRODUCT | |
| 1649 return num; | |
| 1650 } | |
| 1651 | |
| 1652 // If a class (or interface) has a unique concrete method uniqm, return NULL. | |
| 1653 // Otherwise, return a class that contains an interfering method. | |
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1654 Klass* Dependencies::check_unique_concrete_method(Klass* ctxk, Method* uniqm, |
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1655 KlassDepChange* changes) { |
| 0 | 1656 // Here is a missing optimization: If uniqm->is_final(), |
| 1657 // we don't really need to search beneath it for overrides. | |
| 1658 // This is probably not important, since we don't use dependencies | |
| 1659 // to track final methods. (They can't be "definalized".) | |
| 1660 ClassHierarchyWalker wf(uniqm->method_holder(), uniqm); | |
| 1661 return wf.find_witness_definer(ctxk, changes); | |
| 1662 } | |
| 1663 | |
| 1664 // Find the set of all non-abstract methods under ctxk that match m. | |
| 1665 // (The method m must be defined or inherited in ctxk.) | |
| 1666 // Include m itself in the set, unless it is abstract. | |
| 1667 // If this set has exactly one element, return that element. | |
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1668 Method* Dependencies::find_unique_concrete_method(Klass* ctxk, Method* m) { |
| 0 | 1669 ClassHierarchyWalker wf(m); |
| 1670 assert(wf.check_method_context(ctxk, m), "proper context"); | |
| 1671 wf.record_witnesses(1); | |
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1672 Klass* wit = wf.find_witness_definer(ctxk); |
| 0 | 1673 if (wit != NULL) return NULL; // Too many witnesses. |
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1674 Method* fm = wf.found_method(0); // Will be NULL if num_parts == 0. |
| 20785 | 1675 if (Dependencies::is_concrete_method(m, ctxk)) { |
| 0 | 1676 if (fm == NULL) { |
| 1677 // It turns out that m was always the only implementation. | |
| 1678 fm = m; | |
| 1679 } else if (fm != m) { | |
| 1680 // Two conflicting implementations after all. | |
| 1681 // (This can happen if m is inherited into ctxk and fm overrides it.) | |
| 1682 return NULL; | |
| 1683 } | |
| 1684 } | |
| 1685 #ifndef PRODUCT | |
| 1686 // Make sure the dependency mechanism will pass this discovery: | |
| 1687 if (VerifyDependencies && fm != NULL) { | |
| 1688 guarantee(NULL == (void *)check_unique_concrete_method(ctxk, fm), | |
| 1689 "verify dep."); | |
| 1690 } | |
| 1691 #endif //PRODUCT | |
| 1692 return fm; | |
| 1693 } | |
| 1694 | |
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1695 Klass* Dependencies::check_exclusive_concrete_methods(Klass* ctxk, |
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1696 Method* m1, |
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1697 Method* m2, |
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1698 KlassDepChange* changes) { |
| 0 | 1699 ClassHierarchyWalker wf(m1); |
| 1700 wf.add_participant(m1->method_holder()); | |
| 1701 wf.add_participant(m2->method_holder()); | |
| 1702 return wf.find_witness_definer(ctxk, changes); | |
| 1703 } | |
| 1704 | |
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1705 Klass* Dependencies::check_has_no_finalizable_subclasses(Klass* ctxk, KlassDepChange* changes) { |
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1706 Klass* search_at = ctxk; |
| 0 | 1707 if (changes != NULL) |
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1708 search_at = changes->new_type(); // just look at the new bit |
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1709 return find_finalizable_subclass(search_at); |
| 0 | 1710 } |
| 1711 | |
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1712 Klass* Dependencies::check_call_site_target_value(oop call_site, oop method_handle, CallSiteDepChange* changes) { |
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1713 assert(call_site ->is_a(SystemDictionary::CallSite_klass()), "sanity"); |
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1714 assert(method_handle->is_a(SystemDictionary::MethodHandle_klass()), "sanity"); |
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1715 if (changes == NULL) { |
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1716 // Validate all CallSites |
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1717 if (java_lang_invoke_CallSite::target(call_site) != method_handle) |
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1718 return call_site->klass(); // assertion failed |
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1719 } else { |
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1720 // Validate the given CallSite |
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1721 if (call_site == changes->call_site() && java_lang_invoke_CallSite::target(call_site) != changes->method_handle()) { |
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1722 assert(method_handle != changes->method_handle(), "must be"); |
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1723 return call_site->klass(); // assertion failed |
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1724 } |
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1725 } |
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1726 return NULL; // assertion still valid |
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1727 } |
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1728 |
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1729 |
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1730 void Dependencies::DepStream::trace_and_log_witness(Klass* witness) { |
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1731 if (witness != NULL) { |
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1732 if (TraceDependencies) { |
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1733 print_dependency(witness, /*verbose=*/ true); |
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1734 } |
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1735 // The following is a no-op unless logging is enabled: |
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1736 log_dependency(witness); |
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1737 } |
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1738 } |
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1739 |
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1740 |
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1741 Klass* Dependencies::DepStream::check_klass_dependency(KlassDepChange* changes) { |
| 0 | 1742 assert_locked_or_safepoint(Compile_lock); |
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1743 Dependencies::check_valid_dependency_type(type()); |
| 0 | 1744 |
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1745 Klass* witness = NULL; |
| 0 | 1746 switch (type()) { |
| 1747 case evol_method: | |
| 1748 witness = check_evol_method(method_argument(0)); | |
| 1749 break; | |
| 1750 case leaf_type: | |
| 1751 witness = check_leaf_type(context_type()); | |
| 1752 break; | |
| 1753 case abstract_with_unique_concrete_subtype: | |
|
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1754 witness = check_abstract_with_unique_concrete_subtype(context_type(), type_argument(1), changes); |
| 0 | 1755 break; |
| 1756 case abstract_with_no_concrete_subtype: | |
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1757 witness = check_abstract_with_no_concrete_subtype(context_type(), changes); |
| 0 | 1758 break; |
| 1759 case concrete_with_no_concrete_subtype: | |
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1760 witness = check_concrete_with_no_concrete_subtype(context_type(), changes); |
| 0 | 1761 break; |
| 1762 case unique_concrete_method: | |
|
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1763 witness = check_unique_concrete_method(context_type(), method_argument(1), changes); |
| 0 | 1764 break; |
| 1765 case abstract_with_exclusive_concrete_subtypes_2: | |
|
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1766 witness = check_abstract_with_exclusive_concrete_subtypes(context_type(), type_argument(1), type_argument(2), changes); |
| 0 | 1767 break; |
| 1768 case exclusive_concrete_methods_2: | |
|
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1769 witness = check_exclusive_concrete_methods(context_type(), method_argument(1), method_argument(2), changes); |
| 0 | 1770 break; |
| 1771 case no_finalizable_subclasses: | |
|
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1772 witness = check_has_no_finalizable_subclasses(context_type(), changes); |
| 0 | 1773 break; |
|
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1774 default: |
| 0 | 1775 witness = NULL; |
| 1776 break; | |
| 1777 } | |
|
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1778 trace_and_log_witness(witness); |
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1779 return witness; |
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1780 } |
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1781 |
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1782 |
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1783 Klass* Dependencies::DepStream::check_call_site_dependency(CallSiteDepChange* changes) { |
|
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1784 assert_locked_or_safepoint(Compile_lock); |
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1785 Dependencies::check_valid_dependency_type(type()); |
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1786 |
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1787 Klass* witness = NULL; |
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1788 switch (type()) { |
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1789 case call_site_target_value: |
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1790 witness = check_call_site_target_value(argument_oop(0), argument_oop(1), changes); |
|
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1791 break; |
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1792 default: |
|
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1793 witness = NULL; |
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1794 break; |
| 0 | 1795 } |
|
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1796 trace_and_log_witness(witness); |
| 0 | 1797 return witness; |
| 1798 } | |
| 1799 | |
| 1800 | |
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1801 Klass* Dependencies::DepStream::spot_check_dependency_at(DepChange& changes) { |
|
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1802 // Handle klass dependency |
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1803 if (changes.is_klass_change() && changes.as_klass_change()->involves_context(context_type())) |
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1804 return check_klass_dependency(changes.as_klass_change()); |
| 0 | 1805 |
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1806 // Handle CallSite dependency |
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1807 if (changes.is_call_site_change()) |
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1808 return check_call_site_dependency(changes.as_call_site_change()); |
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1809 |
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1810 // irrelevant dependency; skip it |
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1811 return NULL; |
| 0 | 1812 } |
| 1813 | |
| 1814 | |
|
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1815 void DepChange::print() { |
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1816 int nsup = 0, nint = 0; |
| 0 | 1817 for (ContextStream str(*this); str.next(); ) { |
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1818 Klass* k = str.klass(); |
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1819 switch (str.change_type()) { |
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1820 case Change_new_type: |
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1821 tty->print_cr(" dependee = %s", InstanceKlass::cast(k)->external_name()); |
|
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1822 break; |
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1823 case Change_new_sub: |
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1824 if (!WizardMode) { |
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1825 ++nsup; |
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1826 } else { |
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1827 tty->print_cr(" context super = %s", InstanceKlass::cast(k)->external_name()); |
|
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1828 } |
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1829 break; |
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1830 case Change_new_impl: |
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1831 if (!WizardMode) { |
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1832 ++nint; |
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1833 } else { |
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1834 tty->print_cr(" context interface = %s", InstanceKlass::cast(k)->external_name()); |
|
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1835 } |
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1836 break; |
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1837 } |
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1838 } |
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1839 if (nsup + nint != 0) { |
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1840 tty->print_cr(" context supers = %d, interfaces = %d", nsup, nint); |
| 0 | 1841 } |
| 1842 } | |
| 1843 | |
|
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1844 void DepChange::ContextStream::start() { |
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1845 Klass* new_type = _changes.is_klass_change() ? _changes.as_klass_change()->new_type() : (Klass*) NULL; |
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1846 _change_type = (new_type == NULL ? NO_CHANGE : Start_Klass); |
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1847 _klass = new_type; |
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1848 _ti_base = NULL; |
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1849 _ti_index = 0; |
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1850 _ti_limit = 0; |
| 0 | 1851 } |
| 1852 | |
| 1853 bool DepChange::ContextStream::next() { | |
| 1854 switch (_change_type) { | |
| 1855 case Start_Klass: // initial state; _klass is the new type | |
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1856 _ti_base = InstanceKlass::cast(_klass)->transitive_interfaces(); |
| 0 | 1857 _ti_index = 0; |
| 1858 _change_type = Change_new_type; | |
| 1859 return true; | |
| 1860 case Change_new_type: | |
| 1861 // fall through: | |
| 1862 _change_type = Change_new_sub; | |
| 1863 case Change_new_sub: | |
|
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1864 // 6598190: brackets workaround Sun Studio C++ compiler bug 6629277 |
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1865 { |
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1866 _klass = InstanceKlass::cast(_klass)->super(); |
|
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1867 if (_klass != NULL) { |
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1868 return true; |
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1869 } |
| 0 | 1870 } |
| 1871 // else set up _ti_limit and fall through: | |
| 1872 _ti_limit = (_ti_base == NULL) ? 0 : _ti_base->length(); | |
| 1873 _change_type = Change_new_impl; | |
| 1874 case Change_new_impl: | |
| 1875 if (_ti_index < _ti_limit) { | |
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1876 _klass = _ti_base->at(_ti_index++); |
| 0 | 1877 return true; |
| 1878 } | |
| 1879 // fall through: | |
| 1880 _change_type = NO_CHANGE; // iterator is exhausted | |
| 1881 case NO_CHANGE: | |
| 1882 break; | |
| 1883 default: | |
| 1884 ShouldNotReachHere(); | |
| 1885 } | |
| 1886 return false; | |
| 1887 } | |
| 1888 | |
|
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1889 void KlassDepChange::initialize() { |
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1890 // entire transaction must be under this lock: |
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1891 assert_lock_strong(Compile_lock); |
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1892 |
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1893 // Mark all dependee and all its superclasses |
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1894 // Mark transitive interfaces |
| 0 | 1895 for (ContextStream str(*this); str.next(); ) { |
|
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1896 Klass* d = str.klass(); |
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1897 assert(!InstanceKlass::cast(d)->is_marked_dependent(), "checking"); |
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1898 InstanceKlass::cast(d)->set_is_marked_dependent(true); |
| 0 | 1899 } |
|
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1900 } |
|
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1901 |
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1902 KlassDepChange::~KlassDepChange() { |
|
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1903 // Unmark all dependee and all its superclasses |
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1904 // Unmark transitive interfaces |
|
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1905 for (ContextStream str(*this); str.next(); ) { |
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1906 Klass* d = str.klass(); |
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1907 InstanceKlass::cast(d)->set_is_marked_dependent(false); |
| 0 | 1908 } |
| 1909 } | |
| 1910 | |
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1911 bool KlassDepChange::involves_context(Klass* k) { |
| 6983 | 1912 if (k == NULL || !k->oop_is_instance()) { |
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1913 return false; |
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1914 } |
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1915 InstanceKlass* ik = InstanceKlass::cast(k); |
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1916 bool is_contained = ik->is_marked_dependent(); |
| 6983 | 1917 assert(is_contained == new_type()->is_subtype_of(k), |
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1918 "correct marking of potential context types"); |
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1919 return is_contained; |
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1920 } |
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1921 |
| 0 | 1922 #ifndef PRODUCT |
| 1923 void Dependencies::print_statistics() { | |
| 1924 if (deps_find_witness_print != 0) { | |
| 1925 // Call one final time, to flush out the data. | |
| 1926 deps_find_witness_print = -1; | |
| 1927 count_find_witness_calls(); | |
| 1928 } | |
| 1929 } | |
| 1930 #endif |