Mercurial > hg > truffle
annotate src/share/vm/code/dependencies.cpp @ 10408:836a62f43af9
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
| author | Doug Simon <doug.simon@oracle.com> |
|---|---|
| date | Wed, 19 Jun 2013 10:45:56 +0200 |
| parents | 2979aaac95af |
| children | 6b0fd0964b87 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #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" |
| 36 #include "utilities/copy.hpp" | |
| 0 | 37 |
| 38 | |
| 39 #ifdef ASSERT | |
| 40 static bool must_be_in_vm() { | |
| 41 Thread* thread = Thread::current(); | |
| 42 if (thread->is_Java_thread()) | |
| 43 return ((JavaThread*)thread)->thread_state() == _thread_in_vm; | |
| 44 else | |
| 45 return true; //something like this: thread->is_VM_thread(); | |
| 46 } | |
| 47 #endif //ASSERT | |
| 48 | |
| 49 void Dependencies::initialize(ciEnv* env) { | |
| 50 Arena* arena = env->arena(); | |
| 51 _oop_recorder = env->oop_recorder(); | |
| 52 _log = env->log(); | |
| 53 _dep_seen = new(arena) GrowableArray<int>(arena, 500, 0, 0); | |
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54 #ifdef GRAAL |
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55 _using_dep_values = false; |
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56 #endif // GRAAL |
| 0 | 57 DEBUG_ONLY(_deps[end_marker] = NULL); |
| 58 for (int i = (int)FIRST_TYPE; i < (int)TYPE_LIMIT; i++) { | |
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59 _deps[i] = new(arena) GrowableArray<ciBaseObject*>(arena, 10, 0, 0); |
| 0 | 60 } |
| 61 _content_bytes = NULL; | |
| 62 _size_in_bytes = (size_t)-1; | |
| 63 | |
| 64 assert(TYPE_LIMIT <= (1<<LG2_TYPE_LIMIT), "sanity"); | |
| 65 } | |
| 66 | |
| 67 void Dependencies::assert_evol_method(ciMethod* m) { | |
| 68 assert_common_1(evol_method, m); | |
| 69 } | |
| 70 | |
| 71 void Dependencies::assert_leaf_type(ciKlass* ctxk) { | |
| 72 if (ctxk->is_array_klass()) { | |
| 73 // As a special case, support this assertion on an array type, | |
| 74 // which reduces to an assertion on its element type. | |
| 75 // Note that this cannot be done with assertions that | |
| 76 // relate to concreteness or abstractness. | |
| 77 ciType* elemt = ctxk->as_array_klass()->base_element_type(); | |
| 78 if (!elemt->is_instance_klass()) return; // Ex: int[][] | |
| 79 ctxk = elemt->as_instance_klass(); | |
| 80 //if (ctxk->is_final()) return; // Ex: String[][] | |
| 81 } | |
| 82 check_ctxk(ctxk); | |
| 83 assert_common_1(leaf_type, ctxk); | |
| 84 } | |
| 85 | |
| 86 void Dependencies::assert_abstract_with_unique_concrete_subtype(ciKlass* ctxk, ciKlass* conck) { | |
| 87 check_ctxk_abstract(ctxk); | |
| 88 assert_common_2(abstract_with_unique_concrete_subtype, ctxk, conck); | |
| 89 } | |
| 90 | |
| 91 void Dependencies::assert_abstract_with_no_concrete_subtype(ciKlass* ctxk) { | |
| 92 check_ctxk_abstract(ctxk); | |
| 93 assert_common_1(abstract_with_no_concrete_subtype, ctxk); | |
| 94 } | |
| 95 | |
| 96 void Dependencies::assert_concrete_with_no_concrete_subtype(ciKlass* ctxk) { | |
| 97 check_ctxk_concrete(ctxk); | |
| 98 assert_common_1(concrete_with_no_concrete_subtype, ctxk); | |
| 99 } | |
| 100 | |
| 101 void Dependencies::assert_unique_concrete_method(ciKlass* ctxk, ciMethod* uniqm) { | |
| 102 check_ctxk(ctxk); | |
| 103 assert_common_2(unique_concrete_method, ctxk, uniqm); | |
| 104 } | |
| 105 | |
| 106 void Dependencies::assert_abstract_with_exclusive_concrete_subtypes(ciKlass* ctxk, ciKlass* k1, ciKlass* k2) { | |
| 107 check_ctxk(ctxk); | |
| 108 assert_common_3(abstract_with_exclusive_concrete_subtypes_2, ctxk, k1, k2); | |
| 109 } | |
| 110 | |
| 111 void Dependencies::assert_exclusive_concrete_methods(ciKlass* ctxk, ciMethod* m1, ciMethod* m2) { | |
| 112 check_ctxk(ctxk); | |
| 113 assert_common_3(exclusive_concrete_methods_2, ctxk, m1, m2); | |
| 114 } | |
| 115 | |
| 116 void Dependencies::assert_has_no_finalizable_subclasses(ciKlass* ctxk) { | |
| 117 check_ctxk(ctxk); | |
| 118 assert_common_1(no_finalizable_subclasses, ctxk); | |
| 119 } | |
| 120 | |
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121 void Dependencies::assert_call_site_target_value(ciCallSite* call_site, ciMethodHandle* method_handle) { |
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122 check_ctxk(call_site->klass()); |
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123 assert_common_2(call_site_target_value, call_site, method_handle); |
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124 } |
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125 |
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126 #ifdef GRAAL |
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127 |
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128 Dependencies::Dependencies(Arena* arena, OopRecorder* oop_recorder) { |
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129 _oop_recorder = oop_recorder; |
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130 _log = NULL; |
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131 _dep_seen = new(arena) GrowableArray<int>(arena, 500, 0, 0); |
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132 _using_dep_values = true; |
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133 DEBUG_ONLY(_dep_values[end_marker] = NULL); |
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134 for (int i = (int)FIRST_TYPE; i < (int)TYPE_LIMIT; i++) { |
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135 _dep_values[i] = new(arena) GrowableArray<DepValue>(arena, 10, 0, DepValue()); |
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136 } |
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137 _content_bytes = NULL; |
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138 _size_in_bytes = (size_t)-1; |
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139 |
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140 assert(TYPE_LIMIT <= (1<<LG2_TYPE_LIMIT), "sanity"); |
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141 } |
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142 |
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143 void Dependencies::assert_evol_method(Method* m) { |
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144 assert_common_1(evol_method, DepValue(_oop_recorder, m)); |
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145 } |
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146 |
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147 void Dependencies::assert_has_no_finalizable_subclasses(Klass* ctxk) { |
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148 check_ctxk(ctxk); |
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149 assert_common_1(no_finalizable_subclasses, DepValue(_oop_recorder, ctxk)); |
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150 } |
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151 |
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152 void Dependencies::assert_leaf_type(Klass* ctxk) { |
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153 if (ctxk->oop_is_array()) { |
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154 // As a special case, support this assertion on an array type, |
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155 // which reduces to an assertion on its element type. |
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156 // Note that this cannot be done with assertions that |
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157 // relate to concreteness or abstractness. |
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158 BasicType elemt = ArrayKlass::cast(ctxk)->element_type(); |
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159 if (is_java_primitive(elemt)) return; // Ex: int[][] |
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160 ctxk = ObjArrayKlass::cast(ctxk)->bottom_klass(); |
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161 //if (ctxk->is_final()) return; // Ex: String[][] |
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162 } |
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163 check_ctxk(ctxk); |
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164 assert_common_1(leaf_type, DepValue(_oop_recorder, ctxk)); |
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165 } |
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166 |
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167 void Dependencies::assert_abstract_with_unique_concrete_subtype(Klass* ctxk, Klass* conck) { |
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168 check_ctxk_abstract(ctxk); |
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169 DepValue ctxk_dv(_oop_recorder, ctxk); |
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170 DepValue conck_dv(_oop_recorder, conck, &ctxk_dv); |
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171 assert_common_2(abstract_with_unique_concrete_subtype, ctxk_dv, conck_dv); |
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172 } |
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173 |
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174 void Dependencies::assert_unique_concrete_method(Klass* ctxk, Method* uniqm) { |
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175 check_ctxk(ctxk); |
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176 assert_common_2(unique_concrete_method, DepValue(_oop_recorder, ctxk), DepValue(_oop_recorder, uniqm)); |
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177 } |
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178 |
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179 void Dependencies::assert_call_site_target_value(oop call_site, oop method_handle) { |
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180 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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181 } |
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182 #endif // GRAAL |
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183 |
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184 |
| 0 | 185 // Helper function. If we are adding a new dep. under ctxk2, |
| 186 // try to find an old dep. under a broader* ctxk1. If there is | |
| 187 // | |
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188 bool Dependencies::maybe_merge_ctxk(GrowableArray<ciBaseObject*>* deps, |
| 0 | 189 int ctxk_i, ciKlass* ctxk2) { |
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190 ciKlass* ctxk1 = deps->at(ctxk_i)->as_metadata()->as_klass(); |
| 0 | 191 if (ctxk2->is_subtype_of(ctxk1)) { |
| 192 return true; // success, and no need to change | |
| 193 } else if (ctxk1->is_subtype_of(ctxk2)) { | |
| 194 // new context class fully subsumes previous one | |
| 195 deps->at_put(ctxk_i, ctxk2); | |
| 196 return true; | |
| 197 } else { | |
| 198 return false; | |
| 199 } | |
| 200 } | |
| 201 | |
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202 void Dependencies::assert_common_1(DepType dept, ciBaseObject* x) { |
| 0 | 203 assert(dep_args(dept) == 1, "sanity"); |
| 204 log_dependency(dept, x); | |
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205 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
| 0 | 206 |
| 207 // see if the same (or a similar) dep is already recorded | |
| 208 if (note_dep_seen(dept, x)) { | |
| 209 assert(deps->find(x) >= 0, "sanity"); | |
| 210 } else { | |
| 211 deps->append(x); | |
| 212 } | |
| 213 } | |
| 214 | |
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215 void Dependencies::assert_common_2(DepType dept, |
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216 ciBaseObject* x0, ciBaseObject* x1) { |
| 0 | 217 assert(dep_args(dept) == 2, "sanity"); |
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218 log_dependency(dept, x0, x1); |
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219 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
| 0 | 220 |
| 221 // see if the same (or a similar) dep is already recorded | |
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222 bool has_ctxk = has_explicit_context_arg(dept); |
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223 if (has_ctxk) { |
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224 assert(dep_context_arg(dept) == 0, "sanity"); |
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225 if (note_dep_seen(dept, x1)) { |
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226 // look in this bucket for redundant assertions |
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227 const int stride = 2; |
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228 for (int i = deps->length(); (i -= stride) >= 0; ) { |
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229 ciBaseObject* y1 = deps->at(i+1); |
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230 if (x1 == y1) { // same subject; check the context |
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231 if (maybe_merge_ctxk(deps, i+0, x0->as_metadata()->as_klass())) { |
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232 return; |
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233 } |
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234 } |
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235 } |
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236 } |
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237 } else { |
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238 assert(dep_implicit_context_arg(dept) == 0, "sanity"); |
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239 if (note_dep_seen(dept, x0) && note_dep_seen(dept, x1)) { |
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240 // look in this bucket for redundant assertions |
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241 const int stride = 2; |
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242 for (int i = deps->length(); (i -= stride) >= 0; ) { |
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243 ciBaseObject* y0 = deps->at(i+0); |
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244 ciBaseObject* y1 = deps->at(i+1); |
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245 if (x0 == y0 && x1 == y1) { |
| 0 | 246 return; |
| 247 } | |
| 248 } | |
| 249 } | |
| 250 } | |
| 251 | |
| 252 // append the assertion in the correct bucket: | |
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253 deps->append(x0); |
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254 deps->append(x1); |
| 0 | 255 } |
| 256 | |
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257 void Dependencies::assert_common_3(DepType dept, |
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258 ciKlass* ctxk, ciBaseObject* x, ciBaseObject* x2) { |
| 0 | 259 assert(dep_context_arg(dept) == 0, "sanity"); |
| 260 assert(dep_args(dept) == 3, "sanity"); | |
| 261 log_dependency(dept, ctxk, x, x2); | |
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262 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
| 0 | 263 |
| 264 // try to normalize an unordered pair: | |
| 265 bool swap = false; | |
| 266 switch (dept) { | |
| 267 case abstract_with_exclusive_concrete_subtypes_2: | |
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268 swap = (x->ident() > x2->ident() && x->as_metadata()->as_klass() != ctxk); |
| 0 | 269 break; |
| 270 case exclusive_concrete_methods_2: | |
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271 swap = (x->ident() > x2->ident() && x->as_metadata()->as_method()->holder() != ctxk); |
| 0 | 272 break; |
| 273 } | |
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274 if (swap) { ciBaseObject* t = x; x = x2; x2 = t; } |
| 0 | 275 |
| 276 // see if the same (or a similar) dep is already recorded | |
| 277 if (note_dep_seen(dept, x) && note_dep_seen(dept, x2)) { | |
| 278 // look in this bucket for redundant assertions | |
| 279 const int stride = 3; | |
| 280 for (int i = deps->length(); (i -= stride) >= 0; ) { | |
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281 ciBaseObject* y = deps->at(i+1); |
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282 ciBaseObject* y2 = deps->at(i+2); |
| 0 | 283 if (x == y && x2 == y2) { // same subjects; check the context |
| 284 if (maybe_merge_ctxk(deps, i+0, ctxk)) { | |
| 285 return; | |
| 286 } | |
| 287 } | |
| 288 } | |
| 289 } | |
| 290 // append the assertion in the correct bucket: | |
| 291 deps->append(ctxk); | |
| 292 deps->append(x); | |
| 293 deps->append(x2); | |
| 294 } | |
| 295 | |
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296 #ifdef GRAAL |
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297 bool Dependencies::maybe_merge_ctxk(GrowableArray<DepValue>* deps, |
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298 int ctxk_i, DepValue ctxk2_dv) { |
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299 Klass* ctxk1 = deps->at(ctxk_i).as_klass(_oop_recorder); |
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300 Klass* ctxk2 = ctxk2_dv.as_klass(_oop_recorder); |
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301 if (ctxk2->is_subtype_of(ctxk1)) { |
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302 return true; // success, and no need to change |
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303 } else if (ctxk1->is_subtype_of(ctxk2)) { |
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304 // new context class fully subsumes previous one |
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305 deps->at_put(ctxk_i, ctxk2_dv); |
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306 return true; |
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307 } else { |
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308 return false; |
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309 } |
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310 } |
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311 |
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312 void Dependencies::assert_common_1(DepType dept, DepValue x) { |
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313 assert(dep_args(dept) == 1, "sanity"); |
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314 //log_dependency(dept, x); |
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315 GrowableArray<DepValue>* deps = _dep_values[dept]; |
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316 |
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317 // see if the same (or a similar) dep is already recorded |
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318 if (note_dep_seen(dept, x)) { |
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319 assert(deps->find(x) >= 0, "sanity"); |
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320 } else { |
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321 deps->append(x); |
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322 } |
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323 } |
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324 |
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325 void Dependencies::assert_common_2(DepType dept, |
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326 DepValue x0, DepValue x1) { |
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327 assert(dep_args(dept) == 2, "sanity"); |
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328 //log_dependency(dept, x0, x1); |
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329 GrowableArray<DepValue>* deps = _dep_values[dept]; |
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330 |
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331 // see if the same (or a similar) dep is already recorded |
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332 bool has_ctxk = has_explicit_context_arg(dept); |
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333 if (has_ctxk) { |
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334 assert(dep_context_arg(dept) == 0, "sanity"); |
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335 if (note_dep_seen(dept, x1)) { |
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336 // look in this bucket for redundant assertions |
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337 const int stride = 2; |
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338 for (int i = deps->length(); (i -= stride) >= 0; ) { |
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339 DepValue y1 = deps->at(i+1); |
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340 if (x1 == y1) { // same subject; check the context |
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341 if (maybe_merge_ctxk(deps, i+0, x0)) { |
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342 return; |
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343 } |
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344 } |
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345 } |
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346 } |
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347 } else { |
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348 assert(dep_implicit_context_arg(dept) == 0, "sanity"); |
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349 if (note_dep_seen(dept, x0) && note_dep_seen(dept, x1)) { |
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350 // look in this bucket for redundant assertions |
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351 const int stride = 2; |
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352 for (int i = deps->length(); (i -= stride) >= 0; ) { |
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353 DepValue y0 = deps->at(i+0); |
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354 DepValue y1 = deps->at(i+1); |
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355 if (x0 == y0 && x1 == y1) { |
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356 return; |
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357 } |
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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 // append the assertion in the correct bucket: |
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363 deps->append(x0); |
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364 deps->append(x1); |
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365 } |
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366 #endif // GRAAL |
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367 |
| 0 | 368 /// Support for encoding dependencies into an nmethod: |
| 369 | |
| 370 void Dependencies::copy_to(nmethod* nm) { | |
| 371 address beg = nm->dependencies_begin(); | |
| 372 address end = nm->dependencies_end(); | |
| 373 guarantee(end - beg >= (ptrdiff_t) size_in_bytes(), "bad sizing"); | |
| 374 Copy::disjoint_words((HeapWord*) content_bytes(), | |
| 375 (HeapWord*) beg, | |
| 376 size_in_bytes() / sizeof(HeapWord)); | |
| 377 assert(size_in_bytes() % sizeof(HeapWord) == 0, "copy by words"); | |
| 378 } | |
| 379 | |
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380 static int sort_dep(ciBaseObject** p1, ciBaseObject** p2, int narg) { |
| 0 | 381 for (int i = 0; i < narg; i++) { |
| 382 int diff = p1[i]->ident() - p2[i]->ident(); | |
| 383 if (diff != 0) return diff; | |
| 384 } | |
| 385 return 0; | |
| 386 } | |
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387 static int sort_dep_arg_1(ciBaseObject** p1, ciBaseObject** p2) |
| 0 | 388 { return sort_dep(p1, p2, 1); } |
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389 static int sort_dep_arg_2(ciBaseObject** p1, ciBaseObject** p2) |
| 0 | 390 { return sort_dep(p1, p2, 2); } |
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391 static int sort_dep_arg_3(ciBaseObject** p1, ciBaseObject** p2) |
| 0 | 392 { return sort_dep(p1, p2, 3); } |
| 393 | |
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394 #ifdef GRAAL |
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395 // metadata deps are sorted before object deps |
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396 static int sort_dep_value(Dependencies::DepValue* p1, Dependencies::DepValue* p2, int narg) { |
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397 for (int i = 0; i < narg; i++) { |
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398 int diff = p1[i].sort_key() - p2[i].sort_key(); |
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399 if (diff != 0) return diff; |
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400 } |
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401 return 0; |
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402 } |
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403 static int sort_dep_value_arg_1(Dependencies::DepValue* p1, Dependencies::DepValue* p2) |
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404 { return sort_dep_value(p1, p2, 1); } |
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405 static int sort_dep_value_arg_2(Dependencies::DepValue* p1, Dependencies::DepValue* p2) |
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406 { return sort_dep_value(p1, p2, 2); } |
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407 static int sort_dep_value_arg_3(Dependencies::DepValue* p1, Dependencies::DepValue* p2) |
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408 { return sort_dep_value(p1, p2, 3); } |
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409 #endif // GRAAL |
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410 |
| 0 | 411 void Dependencies::sort_all_deps() { |
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412 #ifdef GRAAL |
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413 if (_using_dep_values) { |
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414 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { |
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415 DepType dept = (DepType)deptv; |
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416 GrowableArray<DepValue>* deps = _dep_values[dept]; |
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417 if (deps->length() <= 1) continue; |
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418 switch (dep_args(dept)) { |
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419 case 1: deps->sort(sort_dep_value_arg_1, 1); break; |
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420 case 2: deps->sort(sort_dep_value_arg_2, 2); break; |
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421 case 3: deps->sort(sort_dep_value_arg_3, 3); break; |
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422 default: ShouldNotReachHere(); |
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423 } |
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424 } |
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425 return; |
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426 } |
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427 #endif // GRAAL |
| 0 | 428 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { |
| 429 DepType dept = (DepType)deptv; | |
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430 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
| 0 | 431 if (deps->length() <= 1) continue; |
| 432 switch (dep_args(dept)) { | |
| 433 case 1: deps->sort(sort_dep_arg_1, 1); break; | |
| 434 case 2: deps->sort(sort_dep_arg_2, 2); break; | |
| 435 case 3: deps->sort(sort_dep_arg_3, 3); break; | |
| 436 default: ShouldNotReachHere(); | |
| 437 } | |
| 438 } | |
| 439 } | |
| 440 | |
| 441 size_t Dependencies::estimate_size_in_bytes() { | |
| 442 size_t est_size = 100; | |
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443 #ifdef GRAAL |
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444 if (_using_dep_values) { |
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445 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { |
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446 DepType dept = (DepType)deptv; |
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447 GrowableArray<DepValue>* deps = _dep_values[dept]; |
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448 est_size += deps->length() * 2; // tags and argument(s) |
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449 } |
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450 return est_size; |
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451 } |
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452 #endif // GRAAL |
| 0 | 453 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { |
| 454 DepType dept = (DepType)deptv; | |
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455 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
| 0 | 456 est_size += deps->length()*2; // tags and argument(s) |
| 457 } | |
| 458 return est_size; | |
| 459 } | |
| 460 | |
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461 ciKlass* Dependencies::ctxk_encoded_as_null(DepType dept, ciBaseObject* x) { |
| 0 | 462 switch (dept) { |
| 463 case abstract_with_exclusive_concrete_subtypes_2: | |
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464 return x->as_metadata()->as_klass(); |
| 0 | 465 case unique_concrete_method: |
| 466 case exclusive_concrete_methods_2: | |
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467 return x->as_metadata()->as_method()->holder(); |
| 0 | 468 } |
| 469 return NULL; // let NULL be NULL | |
| 470 } | |
| 471 | |
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472 Klass* Dependencies::ctxk_encoded_as_null(DepType dept, Metadata* x) { |
| 0 | 473 assert(must_be_in_vm(), "raw oops here"); |
| 474 switch (dept) { | |
| 475 case abstract_with_exclusive_concrete_subtypes_2: | |
| 476 assert(x->is_klass(), "sanity"); | |
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477 return (Klass*) x; |
| 0 | 478 case unique_concrete_method: |
| 479 case exclusive_concrete_methods_2: | |
| 480 assert(x->is_method(), "sanity"); | |
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481 return ((Method*)x)->method_holder(); |
| 0 | 482 } |
| 483 return NULL; // let NULL be NULL | |
| 484 } | |
| 485 | |
| 486 void Dependencies::encode_content_bytes() { | |
| 487 sort_all_deps(); | |
| 488 | |
| 489 // cast is safe, no deps can overflow INT_MAX | |
| 490 CompressedWriteStream bytes((int)estimate_size_in_bytes()); | |
| 491 | |
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492 #ifdef GRAAL |
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493 if (_using_dep_values) { |
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494 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { |
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495 DepType dept = (DepType)deptv; |
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496 GrowableArray<DepValue>* deps = _dep_values[dept]; |
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497 if (deps->length() == 0) continue; |
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498 int stride = dep_args(dept); |
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499 int ctxkj = dep_context_arg(dept); // -1 if no context arg |
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500 assert(stride > 0, "sanity"); |
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501 for (int i = 0; i < deps->length(); i += stride) { |
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502 jbyte code_byte = (jbyte)dept; |
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503 int skipj = -1; |
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504 if (ctxkj >= 0 && ctxkj+1 < stride) { |
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505 Klass* ctxk = deps->at(i+ctxkj+0).as_klass(_oop_recorder); |
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506 DepValue x = deps->at(i+ctxkj+1); // following argument |
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507 if (ctxk == ctxk_encoded_as_null(dept, x.as_metadata(_oop_recorder))) { |
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508 skipj = ctxkj; // we win: maybe one less oop to keep track of |
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509 code_byte |= default_context_type_bit; |
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510 } |
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511 } |
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512 bytes.write_byte(code_byte); |
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513 for (int j = 0; j < stride; j++) { |
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514 if (j == skipj) continue; |
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515 DepValue v = deps->at(i+j); |
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516 int idx = v.index(); |
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517 bytes.write_int(idx); |
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518 } |
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519 } |
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520 } |
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521 } else { |
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522 #endif // GRAAL |
| 0 | 523 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { |
| 524 DepType dept = (DepType)deptv; | |
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525 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
| 0 | 526 if (deps->length() == 0) continue; |
| 527 int stride = dep_args(dept); | |
| 528 int ctxkj = dep_context_arg(dept); // -1 if no context arg | |
| 529 assert(stride > 0, "sanity"); | |
| 530 for (int i = 0; i < deps->length(); i += stride) { | |
| 531 jbyte code_byte = (jbyte)dept; | |
| 532 int skipj = -1; | |
| 533 if (ctxkj >= 0 && ctxkj+1 < stride) { | |
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534 ciKlass* ctxk = deps->at(i+ctxkj+0)->as_metadata()->as_klass(); |
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535 ciBaseObject* x = deps->at(i+ctxkj+1); // following argument |
| 0 | 536 if (ctxk == ctxk_encoded_as_null(dept, x)) { |
| 537 skipj = ctxkj; // we win: maybe one less oop to keep track of | |
| 538 code_byte |= default_context_type_bit; | |
| 539 } | |
| 540 } | |
| 541 bytes.write_byte(code_byte); | |
| 542 for (int j = 0; j < stride; j++) { | |
| 543 if (j == skipj) continue; | |
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544 ciBaseObject* v = deps->at(i+j); |
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545 int idx; |
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546 if (v->is_object()) { |
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547 idx = _oop_recorder->find_index(v->as_object()->constant_encoding()); |
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548 } else { |
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549 ciMetadata* meta = v->as_metadata(); |
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550 idx = _oop_recorder->find_index(meta->constant_encoding()); |
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551 } |
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552 bytes.write_int(idx); |
| 0 | 553 } |
| 554 } | |
| 555 } | |
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556 #ifdef GRAAL |
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557 } |
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558 #endif // GRAAL |
| 0 | 559 |
| 560 // write a sentinel byte to mark the end | |
| 561 bytes.write_byte(end_marker); | |
| 562 | |
| 563 // round it out to a word boundary | |
| 564 while (bytes.position() % sizeof(HeapWord) != 0) { | |
| 565 bytes.write_byte(end_marker); | |
| 566 } | |
| 567 | |
| 568 // check whether the dept byte encoding really works | |
| 569 assert((jbyte)default_context_type_bit != 0, "byte overflow"); | |
| 570 | |
| 571 _content_bytes = bytes.buffer(); | |
| 572 _size_in_bytes = bytes.position(); | |
| 573 } | |
| 574 | |
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575 |
| 0 | 576 const char* Dependencies::_dep_name[TYPE_LIMIT] = { |
| 577 "end_marker", | |
| 578 "evol_method", | |
| 579 "leaf_type", | |
| 580 "abstract_with_unique_concrete_subtype", | |
| 581 "abstract_with_no_concrete_subtype", | |
| 582 "concrete_with_no_concrete_subtype", | |
| 583 "unique_concrete_method", | |
| 584 "abstract_with_exclusive_concrete_subtypes_2", | |
| 585 "exclusive_concrete_methods_2", | |
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586 "no_finalizable_subclasses", |
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587 "call_site_target_value" |
| 0 | 588 }; |
| 589 | |
| 590 int Dependencies::_dep_args[TYPE_LIMIT] = { | |
| 591 -1,// end_marker | |
| 592 1, // evol_method m | |
| 593 1, // leaf_type ctxk | |
| 594 2, // abstract_with_unique_concrete_subtype ctxk, k | |
| 595 1, // abstract_with_no_concrete_subtype ctxk | |
| 596 1, // concrete_with_no_concrete_subtype ctxk | |
| 597 2, // unique_concrete_method ctxk, m | |
| 598 3, // unique_concrete_subtypes_2 ctxk, k1, k2 | |
| 599 3, // unique_concrete_methods_2 ctxk, m1, m2 | |
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600 1, // no_finalizable_subclasses ctxk |
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601 2 // call_site_target_value call_site, method_handle |
| 0 | 602 }; |
| 603 | |
| 604 const char* Dependencies::dep_name(Dependencies::DepType dept) { | |
| 605 if (!dept_in_mask(dept, all_types)) return "?bad-dep?"; | |
| 606 return _dep_name[dept]; | |
| 607 } | |
| 608 | |
| 609 int Dependencies::dep_args(Dependencies::DepType dept) { | |
| 610 if (!dept_in_mask(dept, all_types)) return -1; | |
| 611 return _dep_args[dept]; | |
| 612 } | |
| 613 | |
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614 void Dependencies::check_valid_dependency_type(DepType dept) { |
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615 guarantee(FIRST_TYPE <= dept && dept < TYPE_LIMIT, err_msg("invalid dependency type: %d", (int) dept)); |
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616 } |
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617 |
| 0 | 618 // for the sake of the compiler log, print out current dependencies: |
| 619 void Dependencies::log_all_dependencies() { | |
| 620 if (log() == NULL) return; | |
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621 ciBaseObject* args[max_arg_count]; |
| 0 | 622 for (int deptv = (int)FIRST_TYPE; deptv < (int)TYPE_LIMIT; deptv++) { |
| 623 DepType dept = (DepType)deptv; | |
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624 GrowableArray<ciBaseObject*>* deps = _deps[dept]; |
| 0 | 625 if (deps->length() == 0) continue; |
| 626 int stride = dep_args(dept); | |
| 627 for (int i = 0; i < deps->length(); i += stride) { | |
| 628 for (int j = 0; j < stride; j++) { | |
| 629 // flush out the identities before printing | |
| 630 args[j] = deps->at(i+j); | |
| 631 } | |
| 632 write_dependency_to(log(), dept, stride, args); | |
| 633 } | |
| 634 } | |
| 635 } | |
| 636 | |
| 637 void Dependencies::write_dependency_to(CompileLog* log, | |
| 638 DepType dept, | |
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639 int nargs, DepArgument args[], |
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640 Klass* witness) { |
| 0 | 641 if (log == NULL) { |
| 642 return; | |
| 643 } | |
| 644 ciEnv* env = ciEnv::current(); | |
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645 ciBaseObject* ciargs[max_arg_count]; |
| 0 | 646 assert(nargs <= max_arg_count, "oob"); |
| 647 for (int j = 0; j < nargs; j++) { | |
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648 if (args[j].is_oop()) { |
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649 ciargs[j] = env->get_object(args[j].oop_value()); |
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650 } else { |
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651 ciargs[j] = env->get_metadata(args[j].metadata_value()); |
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652 } |
| 0 | 653 } |
| 654 Dependencies::write_dependency_to(log, dept, nargs, ciargs, witness); | |
| 655 } | |
| 656 | |
| 657 void Dependencies::write_dependency_to(CompileLog* log, | |
| 658 DepType dept, | |
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659 int nargs, ciBaseObject* args[], |
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660 Klass* witness) { |
| 0 | 661 if (log == NULL) return; |
| 662 assert(nargs <= max_arg_count, "oob"); | |
| 663 int argids[max_arg_count]; | |
| 664 int ctxkj = dep_context_arg(dept); // -1 if no context arg | |
| 665 int j; | |
| 666 for (j = 0; j < nargs; j++) { | |
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667 if (args[j]->is_object()) { |
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668 argids[j] = log->identify(args[j]->as_object()); |
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669 } else { |
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670 argids[j] = log->identify(args[j]->as_metadata()); |
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671 } |
| 0 | 672 } |
| 673 if (witness != NULL) { | |
| 674 log->begin_elem("dependency_failed"); | |
| 675 } else { | |
| 676 log->begin_elem("dependency"); | |
| 677 } | |
| 678 log->print(" type='%s'", dep_name(dept)); | |
| 679 if (ctxkj >= 0) { | |
| 680 log->print(" ctxk='%d'", argids[ctxkj]); | |
| 681 } | |
| 682 // write remaining arguments, if any. | |
| 683 for (j = 0; j < nargs; j++) { | |
| 684 if (j == ctxkj) continue; // already logged | |
| 685 if (j == 1) { | |
| 686 log->print( " x='%d'", argids[j]); | |
| 687 } else { | |
| 688 log->print(" x%d='%d'", j, argids[j]); | |
| 689 } | |
| 690 } | |
| 691 if (witness != NULL) { | |
| 692 log->object("witness", witness); | |
| 693 log->stamp(); | |
| 694 } | |
| 695 log->end_elem(); | |
| 696 } | |
| 697 | |
| 698 void Dependencies::write_dependency_to(xmlStream* xtty, | |
| 699 DepType dept, | |
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700 int nargs, DepArgument args[], |
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701 Klass* witness) { |
| 0 | 702 if (xtty == NULL) return; |
| 703 ttyLocker ttyl; | |
| 704 int ctxkj = dep_context_arg(dept); // -1 if no context arg | |
| 705 if (witness != NULL) { | |
| 706 xtty->begin_elem("dependency_failed"); | |
| 707 } else { | |
| 708 xtty->begin_elem("dependency"); | |
| 709 } | |
| 710 xtty->print(" type='%s'", dep_name(dept)); | |
| 711 if (ctxkj >= 0) { | |
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712 xtty->object("ctxk", args[ctxkj].metadata_value()); |
| 0 | 713 } |
| 714 // write remaining arguments, if any. | |
| 715 for (int j = 0; j < nargs; j++) { | |
| 716 if (j == ctxkj) continue; // already logged | |
| 717 if (j == 1) { | |
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718 if (args[j].is_oop()) { |
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719 xtty->object("x", args[j].oop_value()); |
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720 } else { |
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721 xtty->object("x", args[j].metadata_value()); |
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722 } |
| 0 | 723 } else { |
| 724 char xn[10]; sprintf(xn, "x%d", j); | |
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725 if (args[j].is_oop()) { |
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726 xtty->object(xn, args[j].oop_value()); |
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727 } else { |
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728 xtty->object(xn, args[j].metadata_value()); |
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729 } |
| 0 | 730 } |
| 731 } | |
| 732 if (witness != NULL) { | |
| 733 xtty->object("witness", witness); | |
| 734 xtty->stamp(); | |
| 735 } | |
| 736 xtty->end_elem(); | |
| 737 } | |
| 738 | |
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739 void Dependencies::print_dependency(DepType dept, int nargs, DepArgument args[], |
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740 Klass* witness) { |
| 0 | 741 ResourceMark rm; |
| 742 ttyLocker ttyl; // keep the following output all in one block | |
| 743 tty->print_cr("%s of type %s", | |
| 744 (witness == NULL)? "Dependency": "Failed dependency", | |
| 745 dep_name(dept)); | |
| 746 // print arguments | |
| 747 int ctxkj = dep_context_arg(dept); // -1 if no context arg | |
| 748 for (int j = 0; j < nargs; j++) { | |
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749 DepArgument arg = args[j]; |
| 0 | 750 bool put_star = false; |
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751 if (arg.is_null()) continue; |
| 0 | 752 const char* what; |
| 753 if (j == ctxkj) { | |
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754 assert(arg.is_metadata(), "must be"); |
| 0 | 755 what = "context"; |
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756 put_star = !Dependencies::is_concrete_klass((Klass*)arg.metadata_value()); |
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757 } else if (arg.is_method()) { |
| 0 | 758 what = "method "; |
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759 put_star = !Dependencies::is_concrete_method((Method*)arg.metadata_value()); |
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760 } else if (arg.is_klass()) { |
| 0 | 761 what = "class "; |
| 762 } else { | |
| 763 what = "object "; | |
| 764 } | |
| 765 tty->print(" %s = %s", what, (put_star? "*": "")); | |
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766 if (arg.is_klass()) |
| 6983 | 767 tty->print("%s", ((Klass*)arg.metadata_value())->external_name()); |
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768 else if (arg.is_method()) |
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769 ((Method*)arg.metadata_value())->print_value(); |
| 0 | 770 else |
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771 ShouldNotReachHere(); // Provide impl for this type. |
| 0 | 772 tty->cr(); |
| 773 } | |
| 774 if (witness != NULL) { | |
| 775 bool put_star = !Dependencies::is_concrete_klass(witness); | |
| 776 tty->print_cr(" witness = %s%s", | |
| 777 (put_star? "*": ""), | |
| 6983 | 778 witness->external_name()); |
| 0 | 779 } |
| 780 } | |
| 781 | |
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782 void Dependencies::DepStream::log_dependency(Klass* witness) { |
| 0 | 783 if (_deps == NULL && xtty == NULL) return; // fast cutout for runtime |
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784 ResourceMark rm; |
| 0 | 785 int nargs = argument_count(); |
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786 DepArgument args[max_arg_count]; |
| 0 | 787 for (int j = 0; j < nargs; j++) { |
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788 if (type() == call_site_target_value) { |
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789 args[j] = argument_oop(j); |
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790 } else { |
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791 args[j] = argument(j); |
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792 } |
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793 } |
| 0 | 794 if (_deps != NULL && _deps->log() != NULL) { |
| 795 Dependencies::write_dependency_to(_deps->log(), | |
| 796 type(), nargs, args, witness); | |
| 797 } else { | |
| 798 Dependencies::write_dependency_to(xtty, | |
| 799 type(), nargs, args, witness); | |
| 800 } | |
| 801 } | |
| 802 | |
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803 void Dependencies::DepStream::print_dependency(Klass* witness, bool verbose) { |
| 0 | 804 int nargs = argument_count(); |
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805 DepArgument args[max_arg_count]; |
| 0 | 806 for (int j = 0; j < nargs; j++) { |
| 807 args[j] = argument(j); | |
| 808 } | |
| 809 Dependencies::print_dependency(type(), nargs, args, witness); | |
| 810 if (verbose) { | |
| 811 if (_code != NULL) { | |
| 812 tty->print(" code: "); | |
| 813 _code->print_value_on(tty); | |
| 814 tty->cr(); | |
| 815 } | |
| 816 } | |
| 817 } | |
| 818 | |
| 819 | |
| 820 /// Dependency stream support (decodes dependencies from an nmethod): | |
| 821 | |
| 822 #ifdef ASSERT | |
| 823 void Dependencies::DepStream::initial_asserts(size_t byte_limit) { | |
| 824 assert(must_be_in_vm(), "raw oops here"); | |
| 825 _byte_limit = byte_limit; | |
| 826 _type = (DepType)(end_marker-1); // defeat "already at end" assert | |
| 827 assert((_code!=NULL) + (_deps!=NULL) == 1, "one or t'other"); | |
| 828 } | |
| 829 #endif //ASSERT | |
| 830 | |
| 831 bool Dependencies::DepStream::next() { | |
| 832 assert(_type != end_marker, "already at end"); | |
| 833 if (_bytes.position() == 0 && _code != NULL | |
| 834 && _code->dependencies_size() == 0) { | |
| 835 // Method has no dependencies at all. | |
| 836 return false; | |
| 837 } | |
| 838 int code_byte = (_bytes.read_byte() & 0xFF); | |
| 839 if (code_byte == end_marker) { | |
| 840 DEBUG_ONLY(_type = end_marker); | |
| 841 return false; | |
| 842 } else { | |
| 843 int ctxk_bit = (code_byte & Dependencies::default_context_type_bit); | |
| 844 code_byte -= ctxk_bit; | |
| 845 DepType dept = (DepType)code_byte; | |
| 846 _type = dept; | |
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847 Dependencies::check_valid_dependency_type(dept); |
| 0 | 848 int stride = _dep_args[dept]; |
| 849 assert(stride == dep_args(dept), "sanity"); | |
| 850 int skipj = -1; | |
| 851 if (ctxk_bit != 0) { | |
| 852 skipj = 0; // currently the only context argument is at zero | |
| 853 assert(skipj == dep_context_arg(dept), "zero arg always ctxk"); | |
| 854 } | |
| 855 for (int j = 0; j < stride; j++) { | |
| 856 _xi[j] = (j == skipj)? 0: _bytes.read_int(); | |
| 857 } | |
| 858 DEBUG_ONLY(_xi[stride] = -1); // help detect overruns | |
| 859 return true; | |
| 860 } | |
| 861 } | |
| 862 | |
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863 inline Metadata* Dependencies::DepStream::recorded_metadata_at(int i) { |
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864 Metadata* o = NULL; |
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865 if (_code != NULL) { |
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866 o = _code->metadata_at(i); |
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867 } else { |
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868 o = _deps->oop_recorder()->metadata_at(i); |
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869 } |
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870 assert(o == NULL || o->is_metadata(), |
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871 err_msg("Should be perm " PTR_FORMAT, o)); |
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872 return o; |
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873 } |
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874 |
| 0 | 875 inline oop Dependencies::DepStream::recorded_oop_at(int i) { |
| 876 return (_code != NULL) | |
| 877 ? _code->oop_at(i) | |
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878 : JNIHandles::resolve(_deps->oop_recorder()->oop_at(i)); |
| 0 | 879 } |
| 880 | |
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881 Metadata* Dependencies::DepStream::argument(int i) { |
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882 Metadata* result = recorded_metadata_at(argument_index(i)); |
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883 |
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884 if (result == NULL) { // Explicit context argument can be compressed |
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885 int ctxkj = dep_context_arg(type()); // -1 if no explicit context arg |
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886 if (ctxkj >= 0 && i == ctxkj && ctxkj+1 < argument_count()) { |
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887 result = ctxk_encoded_as_null(type(), argument(ctxkj+1)); |
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888 } |
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889 } |
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890 |
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891 assert(result == NULL || result->is_klass() || result->is_method(), "must be"); |
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892 return result; |
| 0 | 893 } |
| 894 | |
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895 oop Dependencies::DepStream::argument_oop(int i) { |
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896 oop result = recorded_oop_at(argument_index(i)); |
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897 assert(result == NULL || result->is_oop(), "must be"); |
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898 return result; |
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899 } |
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900 |
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901 Klass* Dependencies::DepStream::context_type() { |
| 0 | 902 assert(must_be_in_vm(), "raw oops here"); |
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903 |
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904 // Most dependencies have an explicit context type argument. |
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905 { |
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906 int ctxkj = dep_context_arg(type()); // -1 if no explicit context arg |
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907 if (ctxkj >= 0) { |
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908 Metadata* k = argument(ctxkj); |
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909 assert(k != NULL && k->is_klass(), "type check"); |
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910 return (Klass*)k; |
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911 } |
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912 } |
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913 |
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914 // Some dependencies are using the klass of the first object |
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915 // argument as implicit context type (e.g. call_site_target_value). |
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916 { |
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917 int ctxkj = dep_implicit_context_arg(type()); |
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918 if (ctxkj >= 0) { |
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919 Klass* k = argument_oop(ctxkj)->klass(); |
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920 assert(k != NULL && k->is_klass(), "type check"); |
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921 return (Klass*) k; |
| 0 | 922 } |
| 923 } | |
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924 |
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925 // And some dependencies don't have a context type at all, |
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926 // e.g. evol_method. |
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927 return NULL; |
| 0 | 928 } |
| 929 | |
| 930 /// Checking dependencies: | |
| 931 | |
| 932 // This hierarchy walker inspects subtypes of a given type, | |
| 933 // trying to find a "bad" class which breaks a dependency. | |
| 934 // Such a class is called a "witness" to the broken dependency. | |
| 935 // While searching around, we ignore "participants", which | |
| 936 // are already known to the dependency. | |
| 937 class ClassHierarchyWalker { | |
| 938 public: | |
| 939 enum { PARTICIPANT_LIMIT = 3 }; | |
| 940 | |
| 941 private: | |
| 942 // optional method descriptor to check for: | |
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943 Symbol* _name; |
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944 Symbol* _signature; |
| 0 | 945 |
| 946 // special classes which are not allowed to be witnesses: | |
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947 Klass* _participants[PARTICIPANT_LIMIT+1]; |
| 0 | 948 int _num_participants; |
| 949 | |
| 950 // cache of method lookups | |
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951 Method* _found_methods[PARTICIPANT_LIMIT+1]; |
| 0 | 952 |
| 953 // if non-zero, tells how many witnesses to convert to participants | |
| 954 int _record_witnesses; | |
| 955 | |
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956 void initialize(Klass* participant) { |
| 0 | 957 _record_witnesses = 0; |
| 958 _participants[0] = participant; | |
| 959 _found_methods[0] = NULL; | |
| 960 _num_participants = 0; | |
| 961 if (participant != NULL) { | |
| 962 // Terminating NULL. | |
| 963 _participants[1] = NULL; | |
| 964 _found_methods[1] = NULL; | |
| 965 _num_participants = 1; | |
| 966 } | |
| 967 } | |
| 968 | |
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969 void initialize_from_method(Method* m) { |
| 0 | 970 assert(m != NULL && m->is_method(), "sanity"); |
| 971 _name = m->name(); | |
| 972 _signature = m->signature(); | |
| 973 } | |
| 974 | |
| 975 public: | |
| 976 // The walker is initialized to recognize certain methods and/or types | |
| 977 // as friendly participants. | |
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978 ClassHierarchyWalker(Klass* participant, Method* m) { |
| 0 | 979 initialize_from_method(m); |
| 980 initialize(participant); | |
| 981 } | |
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982 ClassHierarchyWalker(Method* m) { |
| 0 | 983 initialize_from_method(m); |
| 984 initialize(NULL); | |
| 985 } | |
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986 ClassHierarchyWalker(Klass* participant = NULL) { |
| 0 | 987 _name = NULL; |
| 988 _signature = NULL; | |
| 989 initialize(participant); | |
| 990 } | |
| 991 | |
| 992 // This is common code for two searches: One for concrete subtypes, | |
| 993 // the other for concrete method implementations and overrides. | |
| 994 bool doing_subtype_search() { | |
| 995 return _name == NULL; | |
| 996 } | |
| 997 | |
| 998 int num_participants() { return _num_participants; } | |
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999 Klass* participant(int n) { |
| 0 | 1000 assert((uint)n <= (uint)_num_participants, "oob"); |
| 1001 return _participants[n]; | |
| 1002 } | |
| 1003 | |
| 1004 // Note: If n==num_participants, returns NULL. | |
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1005 Method* found_method(int n) { |
| 0 | 1006 assert((uint)n <= (uint)_num_participants, "oob"); |
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1007 Method* fm = _found_methods[n]; |
| 0 | 1008 assert(n == _num_participants || fm != NULL, "proper usage"); |
| 1009 assert(fm == NULL || fm->method_holder() == _participants[n], "sanity"); | |
| 1010 return fm; | |
| 1011 } | |
| 1012 | |
| 1013 #ifdef ASSERT | |
| 1014 // Assert that m is inherited into ctxk, without intervening overrides. | |
| 1015 // (May return true even if this is not true, in corner cases where we punt.) | |
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1016 bool check_method_context(Klass* ctxk, Method* m) { |
| 0 | 1017 if (m->method_holder() == ctxk) |
| 1018 return true; // Quick win. | |
| 1019 if (m->is_private()) | |
| 1020 return false; // Quick lose. Should not happen. | |
| 1021 if (!(m->is_public() || m->is_protected())) | |
| 1022 // The override story is complex when packages get involved. | |
| 1023 return true; // Must punt the assertion to true. | |
| 6983 | 1024 Klass* k = ctxk; |
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1025 Method* lm = k->lookup_method(m->name(), m->signature()); |
| 0 | 1026 if (lm == NULL && k->oop_is_instance()) { |
| 1027 // It might be an abstract interface method, devoid of mirandas. | |
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1028 lm = ((InstanceKlass*)k)->lookup_method_in_all_interfaces(m->name(), |
| 0 | 1029 m->signature()); |
| 1030 } | |
| 1031 if (lm == m) | |
| 1032 // Method m is inherited into ctxk. | |
| 1033 return true; | |
| 1034 if (lm != NULL) { | |
| 4060 | 1035 if (!(lm->is_public() || lm->is_protected())) { |
| 0 | 1036 // Method is [package-]private, so the override story is complex. |
| 1037 return true; // Must punt the assertion to true. | |
| 4060 | 1038 } |
| 1039 if (lm->is_static()) { | |
| 1040 // Static methods don't override non-static so punt | |
| 1041 return true; | |
| 1042 } | |
| 0 | 1043 if ( !Dependencies::is_concrete_method(lm) |
| 1044 && !Dependencies::is_concrete_method(m) | |
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1045 && lm->method_holder()->is_subtype_of(m->method_holder())) |
| 0 | 1046 // Method m is overridden by lm, but both are non-concrete. |
| 1047 return true; | |
| 1048 } | |
| 1049 ResourceMark rm; | |
| 1050 tty->print_cr("Dependency method not found in the associated context:"); | |
| 6983 | 1051 tty->print_cr(" context = %s", ctxk->external_name()); |
| 0 | 1052 tty->print( " method = "); m->print_short_name(tty); tty->cr(); |
| 1053 if (lm != NULL) { | |
| 1054 tty->print( " found = "); lm->print_short_name(tty); tty->cr(); | |
| 1055 } | |
| 1056 return false; | |
| 1057 } | |
| 1058 #endif | |
| 1059 | |
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1060 void add_participant(Klass* participant) { |
| 0 | 1061 assert(_num_participants + _record_witnesses < PARTICIPANT_LIMIT, "oob"); |
| 1062 int np = _num_participants++; | |
| 1063 _participants[np] = participant; | |
| 1064 _participants[np+1] = NULL; | |
| 1065 _found_methods[np+1] = NULL; | |
| 1066 } | |
| 1067 | |
| 1068 void record_witnesses(int add) { | |
| 1069 if (add > PARTICIPANT_LIMIT) add = PARTICIPANT_LIMIT; | |
| 1070 assert(_num_participants + add < PARTICIPANT_LIMIT, "oob"); | |
| 1071 _record_witnesses = add; | |
| 1072 } | |
| 1073 | |
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1074 bool is_witness(Klass* k) { |
| 0 | 1075 if (doing_subtype_search()) { |
| 1076 return Dependencies::is_concrete_klass(k); | |
| 1077 } else { | |
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1078 Method* m = InstanceKlass::cast(k)->find_method(_name, _signature); |
| 0 | 1079 if (m == NULL || !Dependencies::is_concrete_method(m)) return false; |
| 1080 _found_methods[_num_participants] = m; | |
| 1081 // Note: If add_participant(k) is called, | |
| 1082 // the method m will already be memoized for it. | |
| 1083 return true; | |
| 1084 } | |
| 1085 } | |
| 1086 | |
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1087 bool is_participant(Klass* k) { |
| 0 | 1088 if (k == _participants[0]) { |
| 1089 return true; | |
| 1090 } else if (_num_participants <= 1) { | |
| 1091 return false; | |
| 1092 } else { | |
| 1093 return in_list(k, &_participants[1]); | |
| 1094 } | |
| 1095 } | |
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1096 bool ignore_witness(Klass* witness) { |
| 0 | 1097 if (_record_witnesses == 0) { |
| 1098 return false; | |
| 1099 } else { | |
| 1100 --_record_witnesses; | |
| 1101 add_participant(witness); | |
| 1102 return true; | |
| 1103 } | |
| 1104 } | |
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1105 static bool in_list(Klass* x, Klass** list) { |
| 0 | 1106 for (int i = 0; ; i++) { |
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1107 Klass* y = list[i]; |
| 0 | 1108 if (y == NULL) break; |
| 1109 if (y == x) return true; | |
| 1110 } | |
| 1111 return false; // not in list | |
| 1112 } | |
| 1113 | |
| 1114 private: | |
| 1115 // the actual search method: | |
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1116 Klass* find_witness_anywhere(Klass* context_type, |
| 0 | 1117 bool participants_hide_witnesses, |
| 1118 bool top_level_call = true); | |
| 1119 // the spot-checking version: | |
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1120 Klass* find_witness_in(KlassDepChange& changes, |
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1121 Klass* context_type, |
| 0 | 1122 bool participants_hide_witnesses); |
| 1123 public: | |
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1124 Klass* find_witness_subtype(Klass* context_type, KlassDepChange* changes = NULL) { |
| 0 | 1125 assert(doing_subtype_search(), "must set up a subtype search"); |
| 1126 // When looking for unexpected concrete types, | |
| 1127 // do not look beneath expected ones. | |
| 1128 const bool participants_hide_witnesses = true; | |
| 1129 // CX > CC > C' is OK, even if C' is new. | |
| 1130 // CX > { CC, C' } is not OK if C' is new, and C' is the witness. | |
| 1131 if (changes != NULL) { | |
| 1132 return find_witness_in(*changes, context_type, participants_hide_witnesses); | |
| 1133 } else { | |
| 1134 return find_witness_anywhere(context_type, participants_hide_witnesses); | |
| 1135 } | |
| 1136 } | |
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1137 Klass* find_witness_definer(Klass* context_type, KlassDepChange* changes = NULL) { |
| 0 | 1138 assert(!doing_subtype_search(), "must set up a method definer search"); |
| 1139 // When looking for unexpected concrete methods, | |
| 1140 // look beneath expected ones, to see if there are overrides. | |
| 1141 const bool participants_hide_witnesses = true; | |
| 1142 // CX.m > CC.m > C'.m is not OK, if C'.m is new, and C' is the witness. | |
| 1143 if (changes != NULL) { | |
| 1144 return find_witness_in(*changes, context_type, !participants_hide_witnesses); | |
| 1145 } else { | |
| 1146 return find_witness_anywhere(context_type, !participants_hide_witnesses); | |
| 1147 } | |
| 1148 } | |
| 1149 }; | |
| 1150 | |
| 1151 #ifndef PRODUCT | |
| 1152 static int deps_find_witness_calls = 0; | |
| 1153 static int deps_find_witness_steps = 0; | |
| 1154 static int deps_find_witness_recursions = 0; | |
| 1155 static int deps_find_witness_singles = 0; | |
| 1156 static int deps_find_witness_print = 0; // set to -1 to force a final print | |
| 1157 static bool count_find_witness_calls() { | |
| 1158 if (TraceDependencies || LogCompilation) { | |
| 1159 int pcount = deps_find_witness_print + 1; | |
| 1160 bool final_stats = (pcount == 0); | |
| 1161 bool initial_call = (pcount == 1); | |
| 1162 bool occasional_print = ((pcount & ((1<<10) - 1)) == 0); | |
| 1163 if (pcount < 0) pcount = 1; // crude overflow protection | |
| 1164 deps_find_witness_print = pcount; | |
| 1165 if (VerifyDependencies && initial_call) { | |
| 1166 tty->print_cr("Warning: TraceDependencies results may be inflated by VerifyDependencies"); | |
| 1167 } | |
| 1168 if (occasional_print || final_stats) { | |
| 1169 // Every now and then dump a little info about dependency searching. | |
| 1170 if (xtty != NULL) { | |
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1171 ttyLocker ttyl; |
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1172 xtty->elem("deps_find_witness calls='%d' steps='%d' recursions='%d' singles='%d'", |
| 0 | 1173 deps_find_witness_calls, |
| 1174 deps_find_witness_steps, | |
| 1175 deps_find_witness_recursions, | |
| 1176 deps_find_witness_singles); | |
| 1177 } | |
| 1178 if (final_stats || (TraceDependencies && WizardMode)) { | |
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1179 ttyLocker ttyl; |
| 0 | 1180 tty->print_cr("Dependency check (find_witness) " |
| 1181 "calls=%d, steps=%d (avg=%.1f), recursions=%d, singles=%d", | |
| 1182 deps_find_witness_calls, | |
| 1183 deps_find_witness_steps, | |
| 1184 (double)deps_find_witness_steps / deps_find_witness_calls, | |
| 1185 deps_find_witness_recursions, | |
| 1186 deps_find_witness_singles); | |
| 1187 } | |
| 1188 } | |
| 1189 return true; | |
| 1190 } | |
| 1191 return false; | |
| 1192 } | |
| 1193 #else | |
| 1194 #define count_find_witness_calls() (0) | |
| 1195 #endif //PRODUCT | |
| 1196 | |
| 1197 | |
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1198 Klass* ClassHierarchyWalker::find_witness_in(KlassDepChange& changes, |
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1199 Klass* context_type, |
| 0 | 1200 bool participants_hide_witnesses) { |
| 1201 assert(changes.involves_context(context_type), "irrelevant dependency"); | |
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1202 Klass* new_type = changes.new_type(); |
| 0 | 1203 |
| 1204 count_find_witness_calls(); | |
| 1205 NOT_PRODUCT(deps_find_witness_singles++); | |
| 1206 | |
| 1207 // Current thread must be in VM (not native mode, as in CI): | |
| 1208 assert(must_be_in_vm(), "raw oops here"); | |
| 1209 // Must not move the class hierarchy during this check: | |
| 1210 assert_locked_or_safepoint(Compile_lock); | |
| 1211 | |
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1212 int nof_impls = InstanceKlass::cast(context_type)->nof_implementors(); |
| 30 | 1213 if (nof_impls > 1) { |
| 1214 // Avoid this case: *I.m > { A.m, C }; B.m > C | |
| 1215 // %%% Until this is fixed more systematically, bail out. | |
| 1216 // See corresponding comment in find_witness_anywhere. | |
| 1217 return context_type; | |
| 1218 } | |
| 1219 | |
| 0 | 1220 assert(!is_participant(new_type), "only old classes are participants"); |
| 1221 if (participants_hide_witnesses) { | |
| 1222 // If the new type is a subtype of a participant, we are done. | |
| 1223 for (int i = 0; i < num_participants(); i++) { | |
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1224 Klass* part = participant(i); |
| 0 | 1225 if (part == NULL) continue; |
| 6983 | 1226 assert(changes.involves_context(part) == new_type->is_subtype_of(part), |
| 0 | 1227 "correct marking of participants, b/c new_type is unique"); |
| 1228 if (changes.involves_context(part)) { | |
| 1229 // new guy is protected from this check by previous participant | |
| 1230 return NULL; | |
| 1231 } | |
| 1232 } | |
| 1233 } | |
| 1234 | |
| 1235 if (is_witness(new_type) && | |
| 1236 !ignore_witness(new_type)) { | |
| 1237 return new_type; | |
| 1238 } | |
| 1239 | |
| 1240 return NULL; | |
| 1241 } | |
| 1242 | |
| 1243 | |
| 1244 // Walk hierarchy under a context type, looking for unexpected types. | |
| 1245 // Do not report participant types, and recursively walk beneath | |
| 1246 // them only if participants_hide_witnesses is false. | |
| 1247 // If top_level_call is false, skip testing the context type, | |
| 1248 // because the caller has already considered it. | |
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1249 Klass* ClassHierarchyWalker::find_witness_anywhere(Klass* context_type, |
| 0 | 1250 bool participants_hide_witnesses, |
| 1251 bool top_level_call) { | |
| 1252 // Current thread must be in VM (not native mode, as in CI): | |
| 1253 assert(must_be_in_vm(), "raw oops here"); | |
| 1254 // Must not move the class hierarchy during this check: | |
| 1255 assert_locked_or_safepoint(Compile_lock); | |
| 1256 | |
| 1257 bool do_counts = count_find_witness_calls(); | |
| 1258 | |
| 1259 // Check the root of the sub-hierarchy first. | |
| 1260 if (top_level_call) { | |
| 1261 if (do_counts) { | |
| 1262 NOT_PRODUCT(deps_find_witness_calls++); | |
| 1263 NOT_PRODUCT(deps_find_witness_steps++); | |
| 1264 } | |
| 1265 if (is_participant(context_type)) { | |
| 1266 if (participants_hide_witnesses) return NULL; | |
| 1267 // else fall through to search loop... | |
| 1268 } else if (is_witness(context_type) && !ignore_witness(context_type)) { | |
| 1269 // The context is an abstract class or interface, to start with. | |
| 1270 return context_type; | |
| 1271 } | |
| 1272 } | |
| 1273 | |
| 1274 // Now we must check each implementor and each subclass. | |
| 1275 // Use a short worklist to avoid blowing the stack. | |
| 1276 // Each worklist entry is a *chain* of subklass siblings to process. | |
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1277 const int CHAINMAX = 100; // >= 1 + InstanceKlass::implementors_limit |
| 0 | 1278 Klass* chains[CHAINMAX]; |
| 1279 int chaini = 0; // index into worklist | |
| 1280 Klass* chain; // scratch variable | |
| 1281 #define ADD_SUBCLASS_CHAIN(k) { \ | |
| 1282 assert(chaini < CHAINMAX, "oob"); \ | |
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1283 chain = InstanceKlass::cast(k)->subklass(); \ |
| 0 | 1284 if (chain != NULL) chains[chaini++] = chain; } |
| 1285 | |
| 1286 // Look for non-abstract subclasses. | |
| 1287 // (Note: Interfaces do not have subclasses.) | |
| 1288 ADD_SUBCLASS_CHAIN(context_type); | |
| 1289 | |
| 1290 // If it is an interface, search its direct implementors. | |
| 1291 // (Their subclasses are additional indirect implementors. | |
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1292 // See InstanceKlass::add_implementor.) |
| 0 | 1293 // (Note: nof_implementors is always zero for non-interfaces.) |
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1294 int nof_impls = InstanceKlass::cast(context_type)->nof_implementors(); |
| 0 | 1295 if (nof_impls > 1) { |
| 1296 // Avoid this case: *I.m > { A.m, C }; B.m > C | |
| 1297 // Here, I.m has 2 concrete implementations, but m appears unique | |
| 1298 // as A.m, because the search misses B.m when checking C. | |
| 1299 // The inherited method B.m was getting missed by the walker | |
| 1300 // when interface 'I' was the starting point. | |
| 1301 // %%% Until this is fixed more systematically, bail out. | |
| 1302 // (Old CHA had the same limitation.) | |
| 1303 return context_type; | |
| 1304 } | |
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1305 if (nof_impls > 0) { |
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1306 Klass* impl = InstanceKlass::cast(context_type)->implementor(); |
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1307 assert(impl != NULL, "just checking"); |
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1308 // If impl is the same as the context_type, then more than one |
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1309 // implementor has seen. No exact info in this case. |
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1310 if (impl == context_type) { |
| 0 | 1311 return context_type; // report an inexact witness to this sad affair |
| 1312 } | |
| 1313 if (do_counts) | |
| 1314 { NOT_PRODUCT(deps_find_witness_steps++); } | |
| 1315 if (is_participant(impl)) { | |
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1316 if (!participants_hide_witnesses) { |
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1317 ADD_SUBCLASS_CHAIN(impl); |
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1318 } |
| 0 | 1319 } else if (is_witness(impl) && !ignore_witness(impl)) { |
| 1320 return impl; | |
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1321 } else { |
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1322 ADD_SUBCLASS_CHAIN(impl); |
| 0 | 1323 } |
| 1324 } | |
| 1325 | |
| 1326 // Recursively process each non-trivial sibling chain. | |
| 1327 while (chaini > 0) { | |
| 1328 Klass* chain = chains[--chaini]; | |
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1329 for (Klass* sub = chain; sub != NULL; sub = sub->next_sibling()) { |
| 0 | 1330 if (do_counts) { NOT_PRODUCT(deps_find_witness_steps++); } |
| 1331 if (is_participant(sub)) { | |
| 1332 if (participants_hide_witnesses) continue; | |
| 1333 // else fall through to process this guy's subclasses | |
| 1334 } else if (is_witness(sub) && !ignore_witness(sub)) { | |
| 1335 return sub; | |
| 1336 } | |
| 1337 if (chaini < (VerifyDependencies? 2: CHAINMAX)) { | |
| 1338 // Fast path. (Partially disabled if VerifyDependencies.) | |
| 1339 ADD_SUBCLASS_CHAIN(sub); | |
| 1340 } else { | |
| 1341 // Worklist overflow. Do a recursive call. Should be rare. | |
| 1342 // The recursive call will have its own worklist, of course. | |
| 1343 // (Note that sub has already been tested, so that there is | |
| 1344 // no need for the recursive call to re-test. That's handy, | |
| 1345 // since the recursive call sees sub as the context_type.) | |
| 1346 if (do_counts) { NOT_PRODUCT(deps_find_witness_recursions++); } | |
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1347 Klass* witness = find_witness_anywhere(sub, |
| 0 | 1348 participants_hide_witnesses, |
| 1349 /*top_level_call=*/ false); | |
| 1350 if (witness != NULL) return witness; | |
| 1351 } | |
| 1352 } | |
| 1353 } | |
| 1354 | |
| 1355 // No witness found. The dependency remains unbroken. | |
| 1356 return NULL; | |
| 1357 #undef ADD_SUBCLASS_CHAIN | |
| 1358 } | |
| 1359 | |
| 1360 | |
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1361 bool Dependencies::is_concrete_klass(Klass* k) { |
| 6983 | 1362 if (k->is_abstract()) return false; |
| 0 | 1363 // %%% We could treat classes which are concrete but |
| 1364 // have not yet been instantiated as virtually abstract. | |
| 1365 // This would require a deoptimization barrier on first instantiation. | |
| 1366 //if (k->is_not_instantiated()) return false; | |
| 1367 return true; | |
| 1368 } | |
| 1369 | |
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1370 bool Dependencies::is_concrete_method(Method* m) { |
| 4060 | 1371 // Statics are irrelevant to virtual call sites. |
| 1372 if (m->is_static()) return false; | |
| 1373 | |
| 1374 // We could also return false if m does not yet appear to be | |
| 1375 // executed, if the VM version supports this distinction also. | |
| 6934 | 1376 return !m->is_abstract() && |
| 1377 !InstanceKlass::cast(m->method_holder())->is_interface(); | |
| 1378 // TODO: investigate whether default methods should be | |
| 1379 // considered as "concrete" in this situation. For now they | |
| 1380 // are not. | |
| 0 | 1381 } |
| 1382 | |
| 1383 | |
| 1384 Klass* Dependencies::find_finalizable_subclass(Klass* k) { | |
| 1385 if (k->is_interface()) return NULL; | |
| 1386 if (k->has_finalizer()) return k; | |
| 1387 k = k->subklass(); | |
| 1388 while (k != NULL) { | |
| 1389 Klass* result = find_finalizable_subclass(k); | |
| 1390 if (result != NULL) return result; | |
| 1391 k = k->next_sibling(); | |
| 1392 } | |
| 1393 return NULL; | |
| 1394 } | |
| 1395 | |
| 1396 | |
| 1397 bool Dependencies::is_concrete_klass(ciInstanceKlass* k) { | |
| 1398 if (k->is_abstract()) return false; | |
| 4060 | 1399 // We could also return false if k does not yet appear to be |
| 0 | 1400 // instantiated, if the VM version supports this distinction also. |
| 1401 //if (k->is_not_instantiated()) return false; | |
| 1402 return true; | |
| 1403 } | |
| 1404 | |
| 1405 bool Dependencies::is_concrete_method(ciMethod* m) { | |
| 1406 // Statics are irrelevant to virtual call sites. | |
| 1407 if (m->is_static()) return false; | |
| 1408 | |
| 4060 | 1409 // We could also return false if m does not yet appear to be |
| 0 | 1410 // executed, if the VM version supports this distinction also. |
| 1411 return !m->is_abstract(); | |
| 1412 } | |
| 1413 | |
| 1414 | |
| 1415 bool Dependencies::has_finalizable_subclass(ciInstanceKlass* k) { | |
| 1416 return k->has_finalizable_subclass(); | |
| 1417 } | |
| 1418 | |
| 1419 | |
| 1420 // Any use of the contents (bytecodes) of a method must be | |
| 1421 // marked by an "evol_method" dependency, if those contents | |
| 1422 // can change. (Note: A method is always dependent on itself.) | |
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1423 Klass* Dependencies::check_evol_method(Method* m) { |
| 0 | 1424 assert(must_be_in_vm(), "raw oops here"); |
| 1425 // Did somebody do a JVMTI RedefineClasses while our backs were turned? | |
| 1426 // Or is there a now a breakpoint? | |
| 1427 // (Assumes compiled code cannot handle bkpts; change if UseFastBreakpoints.) | |
| 1428 if (m->is_old() | |
| 1429 || m->number_of_breakpoints() > 0) { | |
| 1430 return m->method_holder(); | |
| 1431 } else { | |
| 1432 return NULL; | |
| 1433 } | |
| 1434 } | |
| 1435 | |
| 1436 // This is a strong assertion: It is that the given type | |
| 1437 // has no subtypes whatever. It is most useful for | |
| 1438 // optimizing checks on reflected types or on array types. | |
| 1439 // (Checks on types which are derived from real instances | |
| 1440 // can be optimized more strongly than this, because we | |
| 1441 // know that the checked type comes from a concrete type, | |
| 1442 // and therefore we can disregard abstract types.) | |
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1443 Klass* Dependencies::check_leaf_type(Klass* ctxk) { |
| 0 | 1444 assert(must_be_in_vm(), "raw oops here"); |
| 1445 assert_locked_or_safepoint(Compile_lock); | |
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1446 InstanceKlass* ctx = InstanceKlass::cast(ctxk); |
| 0 | 1447 Klass* sub = ctx->subklass(); |
| 1448 if (sub != NULL) { | |
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1449 return sub; |
| 0 | 1450 } else if (ctx->nof_implementors() != 0) { |
| 1451 // if it is an interface, it must be unimplemented | |
| 1452 // (if it is not an interface, nof_implementors is always zero) | |
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1453 Klass* impl = ctx->implementor(); |
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1454 assert(impl != NULL, "must be set"); |
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1455 return impl; |
| 0 | 1456 } else { |
| 1457 return NULL; | |
| 1458 } | |
| 1459 } | |
| 1460 | |
| 1461 // Test the assertion that conck is the only concrete subtype* of ctxk. | |
| 1462 // The type conck itself is allowed to have have further concrete subtypes. | |
| 1463 // This allows the compiler to narrow occurrences of ctxk by conck, | |
| 1464 // when dealing with the types of actual instances. | |
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1465 Klass* Dependencies::check_abstract_with_unique_concrete_subtype(Klass* ctxk, |
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1466 Klass* conck, |
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1467 KlassDepChange* changes) { |
| 0 | 1468 ClassHierarchyWalker wf(conck); |
| 1469 return wf.find_witness_subtype(ctxk, changes); | |
| 1470 } | |
| 1471 | |
| 1472 // If a non-concrete class has no concrete subtypes, it is not (yet) | |
| 1473 // instantiatable. This can allow the compiler to make some paths go | |
| 1474 // dead, if they are gated by a test of the type. | |
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1475 Klass* Dependencies::check_abstract_with_no_concrete_subtype(Klass* ctxk, |
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1476 KlassDepChange* changes) { |
| 0 | 1477 // Find any concrete subtype, with no participants: |
| 1478 ClassHierarchyWalker wf; | |
| 1479 return wf.find_witness_subtype(ctxk, changes); | |
| 1480 } | |
| 1481 | |
| 1482 | |
| 1483 // If a concrete class has no concrete subtypes, it can always be | |
| 1484 // exactly typed. This allows the use of a cheaper type test. | |
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1485 Klass* Dependencies::check_concrete_with_no_concrete_subtype(Klass* ctxk, |
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1486 KlassDepChange* changes) { |
| 0 | 1487 // Find any concrete subtype, with only the ctxk as participant: |
| 1488 ClassHierarchyWalker wf(ctxk); | |
| 1489 return wf.find_witness_subtype(ctxk, changes); | |
| 1490 } | |
| 1491 | |
| 1492 | |
| 1493 // Find the unique concrete proper subtype of ctxk, or NULL if there | |
| 1494 // is more than one concrete proper subtype. If there are no concrete | |
| 1495 // proper subtypes, return ctxk itself, whether it is concrete or not. | |
| 1496 // The returned subtype is allowed to have have further concrete subtypes. | |
| 1497 // That is, return CC1 for CX > CC1 > CC2, but NULL for CX > { CC1, CC2 }. | |
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1498 Klass* Dependencies::find_unique_concrete_subtype(Klass* ctxk) { |
| 0 | 1499 ClassHierarchyWalker wf(ctxk); // Ignore ctxk when walking. |
| 1500 wf.record_witnesses(1); // Record one other witness when walking. | |
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1501 Klass* wit = wf.find_witness_subtype(ctxk); |
| 0 | 1502 if (wit != NULL) return NULL; // Too many witnesses. |
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1503 Klass* conck = wf.participant(0); |
| 0 | 1504 if (conck == NULL) { |
| 1505 #ifndef PRODUCT | |
| 1506 // Make sure the dependency mechanism will pass this discovery: | |
| 1507 if (VerifyDependencies) { | |
| 1508 // Turn off dependency tracing while actually testing deps. | |
| 1509 FlagSetting fs(TraceDependencies, false); | |
| 1510 if (!Dependencies::is_concrete_klass(ctxk)) { | |
| 1511 guarantee(NULL == | |
| 1512 (void *)check_abstract_with_no_concrete_subtype(ctxk), | |
| 1513 "verify dep."); | |
| 1514 } else { | |
| 1515 guarantee(NULL == | |
| 1516 (void *)check_concrete_with_no_concrete_subtype(ctxk), | |
| 1517 "verify dep."); | |
| 1518 } | |
| 1519 } | |
| 1520 #endif //PRODUCT | |
| 1521 return ctxk; // Return ctxk as a flag for "no subtypes". | |
| 1522 } else { | |
| 1523 #ifndef PRODUCT | |
| 1524 // Make sure the dependency mechanism will pass this discovery: | |
| 1525 if (VerifyDependencies) { | |
| 1526 // Turn off dependency tracing while actually testing deps. | |
| 1527 FlagSetting fs(TraceDependencies, false); | |
| 1528 if (!Dependencies::is_concrete_klass(ctxk)) { | |
| 1529 guarantee(NULL == (void *) | |
| 1530 check_abstract_with_unique_concrete_subtype(ctxk, conck), | |
| 1531 "verify dep."); | |
| 1532 } | |
| 1533 } | |
| 1534 #endif //PRODUCT | |
| 1535 return conck; | |
| 1536 } | |
| 1537 } | |
| 1538 | |
| 1539 // Test the assertion that the k[12] are the only concrete subtypes of ctxk, | |
| 1540 // except possibly for further subtypes of k[12] themselves. | |
| 1541 // The context type must be abstract. The types k1 and k2 are themselves | |
| 1542 // allowed to have further concrete subtypes. | |
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1543 Klass* Dependencies::check_abstract_with_exclusive_concrete_subtypes( |
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1544 Klass* ctxk, |
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1545 Klass* k1, |
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1546 Klass* k2, |
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1547 KlassDepChange* changes) { |
| 0 | 1548 ClassHierarchyWalker wf; |
| 1549 wf.add_participant(k1); | |
| 1550 wf.add_participant(k2); | |
| 1551 return wf.find_witness_subtype(ctxk, changes); | |
| 1552 } | |
| 1553 | |
| 1554 // Search ctxk for concrete implementations. If there are klen or fewer, | |
| 1555 // pack them into the given array and return the number. | |
| 1556 // Otherwise, return -1, meaning the given array would overflow. | |
| 1557 // (Note that a return of 0 means there are exactly no concrete subtypes.) | |
| 1558 // In this search, if ctxk is concrete, it will be reported alone. | |
| 1559 // For any type CC reported, no proper subtypes of CC will be reported. | |
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1560 int Dependencies::find_exclusive_concrete_subtypes(Klass* ctxk, |
| 0 | 1561 int klen, |
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1562 Klass* karray[]) { |
| 0 | 1563 ClassHierarchyWalker wf; |
| 1564 wf.record_witnesses(klen); | |
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1565 Klass* wit = wf.find_witness_subtype(ctxk); |
| 0 | 1566 if (wit != NULL) return -1; // Too many witnesses. |
| 1567 int num = wf.num_participants(); | |
| 1568 assert(num <= klen, "oob"); | |
| 1569 // Pack the result array with the good news. | |
| 1570 for (int i = 0; i < num; i++) | |
| 1571 karray[i] = wf.participant(i); | |
| 1572 #ifndef PRODUCT | |
| 1573 // Make sure the dependency mechanism will pass this discovery: | |
| 1574 if (VerifyDependencies) { | |
| 1575 // Turn off dependency tracing while actually testing deps. | |
| 1576 FlagSetting fs(TraceDependencies, false); | |
| 1577 switch (Dependencies::is_concrete_klass(ctxk)? -1: num) { | |
| 1578 case -1: // ctxk was itself concrete | |
| 1579 guarantee(num == 1 && karray[0] == ctxk, "verify dep."); | |
| 1580 break; | |
| 1581 case 0: | |
| 1582 guarantee(NULL == (void *)check_abstract_with_no_concrete_subtype(ctxk), | |
| 1583 "verify dep."); | |
| 1584 break; | |
| 1585 case 1: | |
| 1586 guarantee(NULL == (void *) | |
| 1587 check_abstract_with_unique_concrete_subtype(ctxk, karray[0]), | |
| 1588 "verify dep."); | |
| 1589 break; | |
| 1590 case 2: | |
| 1591 guarantee(NULL == (void *) | |
| 1592 check_abstract_with_exclusive_concrete_subtypes(ctxk, | |
| 1593 karray[0], | |
| 1594 karray[1]), | |
| 1595 "verify dep."); | |
| 1596 break; | |
| 1597 default: | |
| 1598 ShouldNotReachHere(); // klen > 2 yet supported | |
| 1599 } | |
| 1600 } | |
| 1601 #endif //PRODUCT | |
| 1602 return num; | |
| 1603 } | |
| 1604 | |
| 1605 // If a class (or interface) has a unique concrete method uniqm, return NULL. | |
| 1606 // Otherwise, return a class that contains an interfering method. | |
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1607 Klass* Dependencies::check_unique_concrete_method(Klass* ctxk, Method* uniqm, |
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1608 KlassDepChange* changes) { |
| 0 | 1609 // Here is a missing optimization: If uniqm->is_final(), |
| 1610 // we don't really need to search beneath it for overrides. | |
| 1611 // This is probably not important, since we don't use dependencies | |
| 1612 // to track final methods. (They can't be "definalized".) | |
| 1613 ClassHierarchyWalker wf(uniqm->method_holder(), uniqm); | |
| 1614 return wf.find_witness_definer(ctxk, changes); | |
| 1615 } | |
| 1616 | |
| 1617 // Find the set of all non-abstract methods under ctxk that match m. | |
| 1618 // (The method m must be defined or inherited in ctxk.) | |
| 1619 // Include m itself in the set, unless it is abstract. | |
| 1620 // If this set has exactly one element, return that element. | |
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1621 Method* Dependencies::find_unique_concrete_method(Klass* ctxk, Method* m) { |
| 0 | 1622 ClassHierarchyWalker wf(m); |
| 1623 assert(wf.check_method_context(ctxk, m), "proper context"); | |
| 1624 wf.record_witnesses(1); | |
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1625 Klass* wit = wf.find_witness_definer(ctxk); |
| 0 | 1626 if (wit != NULL) return NULL; // Too many witnesses. |
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1627 Method* fm = wf.found_method(0); // Will be NULL if num_parts == 0. |
| 0 | 1628 if (Dependencies::is_concrete_method(m)) { |
| 1629 if (fm == NULL) { | |
| 1630 // It turns out that m was always the only implementation. | |
| 1631 fm = m; | |
| 1632 } else if (fm != m) { | |
| 1633 // Two conflicting implementations after all. | |
| 1634 // (This can happen if m is inherited into ctxk and fm overrides it.) | |
| 1635 return NULL; | |
| 1636 } | |
| 1637 } | |
| 1638 #ifndef PRODUCT | |
| 1639 // Make sure the dependency mechanism will pass this discovery: | |
| 1640 if (VerifyDependencies && fm != NULL) { | |
| 1641 guarantee(NULL == (void *)check_unique_concrete_method(ctxk, fm), | |
| 1642 "verify dep."); | |
| 1643 } | |
| 1644 #endif //PRODUCT | |
| 1645 return fm; | |
| 1646 } | |
| 1647 | |
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1648 Klass* Dependencies::check_exclusive_concrete_methods(Klass* ctxk, |
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1649 Method* m1, |
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1650 Method* m2, |
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1651 KlassDepChange* changes) { |
| 0 | 1652 ClassHierarchyWalker wf(m1); |
| 1653 wf.add_participant(m1->method_holder()); | |
| 1654 wf.add_participant(m2->method_holder()); | |
| 1655 return wf.find_witness_definer(ctxk, changes); | |
| 1656 } | |
| 1657 | |
| 1658 // Find the set of all non-abstract methods under ctxk that match m[0]. | |
| 1659 // (The method m[0] must be defined or inherited in ctxk.) | |
| 1660 // Include m itself in the set, unless it is abstract. | |
| 1661 // Fill the given array m[0..(mlen-1)] with this set, and return the length. | |
| 1662 // (The length may be zero if no concrete methods are found anywhere.) | |
| 1663 // If there are too many concrete methods to fit in marray, return -1. | |
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1664 int Dependencies::find_exclusive_concrete_methods(Klass* ctxk, |
| 0 | 1665 int mlen, |
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1666 Method* marray[]) { |
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1667 Method* m0 = marray[0]; |
| 0 | 1668 ClassHierarchyWalker wf(m0); |
| 1669 assert(wf.check_method_context(ctxk, m0), "proper context"); | |
| 1670 wf.record_witnesses(mlen); | |
| 1671 bool participants_hide_witnesses = true; | |
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1672 Klass* wit = wf.find_witness_definer(ctxk); |
| 0 | 1673 if (wit != NULL) return -1; // Too many witnesses. |
| 1674 int num = wf.num_participants(); | |
| 1675 assert(num <= mlen, "oob"); | |
| 1676 // Keep track of whether m is also part of the result set. | |
| 1677 int mfill = 0; | |
| 1678 assert(marray[mfill] == m0, "sanity"); | |
| 1679 if (Dependencies::is_concrete_method(m0)) | |
| 1680 mfill++; // keep m0 as marray[0], the first result | |
| 1681 for (int i = 0; i < num; i++) { | |
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1682 Method* fm = wf.found_method(i); |
| 0 | 1683 if (fm == m0) continue; // Already put this guy in the list. |
| 1684 if (mfill == mlen) { | |
| 1685 return -1; // Oops. Too many methods after all! | |
| 1686 } | |
| 1687 marray[mfill++] = fm; | |
| 1688 } | |
| 1689 #ifndef PRODUCT | |
| 1690 // Make sure the dependency mechanism will pass this discovery: | |
| 1691 if (VerifyDependencies) { | |
| 1692 // Turn off dependency tracing while actually testing deps. | |
| 1693 FlagSetting fs(TraceDependencies, false); | |
| 1694 switch (mfill) { | |
| 1695 case 1: | |
| 1696 guarantee(NULL == (void *)check_unique_concrete_method(ctxk, marray[0]), | |
| 1697 "verify dep."); | |
| 1698 break; | |
| 1699 case 2: | |
| 1700 guarantee(NULL == (void *) | |
| 1701 check_exclusive_concrete_methods(ctxk, marray[0], marray[1]), | |
| 1702 "verify dep."); | |
| 1703 break; | |
| 1704 default: | |
| 1705 ShouldNotReachHere(); // mlen > 2 yet supported | |
| 1706 } | |
| 1707 } | |
| 1708 #endif //PRODUCT | |
| 1709 return mfill; | |
| 1710 } | |
| 1711 | |
| 1712 | |
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1713 Klass* Dependencies::check_has_no_finalizable_subclasses(Klass* ctxk, KlassDepChange* changes) { |
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1714 Klass* search_at = ctxk; |
| 0 | 1715 if (changes != NULL) |
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1716 search_at = changes->new_type(); // just look at the new bit |
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1717 return find_finalizable_subclass(search_at); |
| 0 | 1718 } |
| 1719 | |
| 1720 | |
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1721 Klass* Dependencies::check_call_site_target_value(oop call_site, oop method_handle, CallSiteDepChange* changes) { |
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1722 assert(call_site ->is_a(SystemDictionary::CallSite_klass()), "sanity"); |
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1723 assert(method_handle->is_a(SystemDictionary::MethodHandle_klass()), "sanity"); |
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1724 if (changes == NULL) { |
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1725 // Validate all CallSites |
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1726 if (java_lang_invoke_CallSite::target(call_site) != method_handle) |
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1727 return call_site->klass(); // assertion failed |
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1728 } else { |
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1729 // Validate the given CallSite |
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1730 if (call_site == changes->call_site() && java_lang_invoke_CallSite::target(call_site) != changes->method_handle()) { |
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1731 assert(method_handle != changes->method_handle(), "must be"); |
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1732 return call_site->klass(); // assertion failed |
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1733 } |
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1734 } |
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1735 return NULL; // assertion still valid |
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1736 } |
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1737 |
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1738 |
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1739 void Dependencies::DepStream::trace_and_log_witness(Klass* witness) { |
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1740 if (witness != NULL) { |
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1741 if (TraceDependencies) { |
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1742 print_dependency(witness, /*verbose=*/ true); |
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1743 } |
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1744 // The following is a no-op unless logging is enabled: |
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1745 log_dependency(witness); |
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1746 } |
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1747 } |
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1748 |
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1749 |
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1750 Klass* Dependencies::DepStream::check_klass_dependency(KlassDepChange* changes) { |
| 0 | 1751 assert_locked_or_safepoint(Compile_lock); |
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1752 Dependencies::check_valid_dependency_type(type()); |
| 0 | 1753 |
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1754 Klass* witness = NULL; |
| 0 | 1755 switch (type()) { |
| 1756 case evol_method: | |
| 1757 witness = check_evol_method(method_argument(0)); | |
| 1758 break; | |
| 1759 case leaf_type: | |
| 1760 witness = check_leaf_type(context_type()); | |
| 1761 break; | |
| 1762 case abstract_with_unique_concrete_subtype: | |
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1763 witness = check_abstract_with_unique_concrete_subtype(context_type(), type_argument(1), changes); |
| 0 | 1764 break; |
| 1765 case abstract_with_no_concrete_subtype: | |
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1766 witness = check_abstract_with_no_concrete_subtype(context_type(), changes); |
| 0 | 1767 break; |
| 1768 case concrete_with_no_concrete_subtype: | |
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1769 witness = check_concrete_with_no_concrete_subtype(context_type(), changes); |
| 0 | 1770 break; |
| 1771 case unique_concrete_method: | |
|
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1772 witness = check_unique_concrete_method(context_type(), method_argument(1), changes); |
| 0 | 1773 break; |
| 1774 case abstract_with_exclusive_concrete_subtypes_2: | |
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1775 witness = check_abstract_with_exclusive_concrete_subtypes(context_type(), type_argument(1), type_argument(2), changes); |
| 0 | 1776 break; |
| 1777 case exclusive_concrete_methods_2: | |
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1778 witness = check_exclusive_concrete_methods(context_type(), method_argument(1), method_argument(2), changes); |
| 0 | 1779 break; |
| 1780 case no_finalizable_subclasses: | |
|
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1781 witness = check_has_no_finalizable_subclasses(context_type(), changes); |
| 0 | 1782 break; |
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1783 default: |
| 0 | 1784 witness = NULL; |
| 1785 break; | |
| 1786 } | |
|
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1787 trace_and_log_witness(witness); |
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1788 return witness; |
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1789 } |
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1790 |
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1791 |
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1792 Klass* Dependencies::DepStream::check_call_site_dependency(CallSiteDepChange* changes) { |
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1793 assert_locked_or_safepoint(Compile_lock); |
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1794 Dependencies::check_valid_dependency_type(type()); |
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1795 |
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1796 Klass* witness = NULL; |
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1797 switch (type()) { |
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1798 case call_site_target_value: |
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1799 witness = check_call_site_target_value(argument_oop(0), argument_oop(1), changes); |
|
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1800 break; |
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1801 default: |
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1802 witness = NULL; |
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1803 break; |
| 0 | 1804 } |
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1805 trace_and_log_witness(witness); |
| 0 | 1806 return witness; |
| 1807 } | |
| 1808 | |
| 1809 | |
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1810 Klass* Dependencies::DepStream::spot_check_dependency_at(DepChange& changes) { |
|
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1811 // Handle klass dependency |
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1812 if (changes.is_klass_change() && changes.as_klass_change()->involves_context(context_type())) |
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1813 return check_klass_dependency(changes.as_klass_change()); |
| 0 | 1814 |
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1815 // Handle CallSite dependency |
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1816 if (changes.is_call_site_change()) |
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1817 return check_call_site_dependency(changes.as_call_site_change()); |
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1818 |
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1819 // irrelevant dependency; skip it |
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1820 return NULL; |
| 0 | 1821 } |
| 1822 | |
| 1823 | |
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1824 void DepChange::print() { |
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1825 int nsup = 0, nint = 0; |
| 0 | 1826 for (ContextStream str(*this); str.next(); ) { |
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1827 Klass* k = str.klass(); |
|
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1828 switch (str.change_type()) { |
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1829 case Change_new_type: |
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1830 tty->print_cr(" dependee = %s", InstanceKlass::cast(k)->external_name()); |
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1831 break; |
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1832 case Change_new_sub: |
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1833 if (!WizardMode) { |
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1834 ++nsup; |
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1835 } else { |
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1836 tty->print_cr(" context super = %s", InstanceKlass::cast(k)->external_name()); |
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1837 } |
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1838 break; |
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1839 case Change_new_impl: |
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1840 if (!WizardMode) { |
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1841 ++nint; |
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1842 } else { |
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1843 tty->print_cr(" context interface = %s", InstanceKlass::cast(k)->external_name()); |
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1844 } |
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1845 break; |
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1846 } |
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1847 } |
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1848 if (nsup + nint != 0) { |
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1849 tty->print_cr(" context supers = %d, interfaces = %d", nsup, nint); |
| 0 | 1850 } |
| 1851 } | |
| 1852 | |
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1853 void DepChange::ContextStream::start() { |
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1854 Klass* new_type = _changes.is_klass_change() ? _changes.as_klass_change()->new_type() : (Klass*) NULL; |
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1855 _change_type = (new_type == NULL ? NO_CHANGE : Start_Klass); |
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1856 _klass = new_type; |
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1857 _ti_base = NULL; |
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1858 _ti_index = 0; |
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1859 _ti_limit = 0; |
| 0 | 1860 } |
| 1861 | |
| 1862 bool DepChange::ContextStream::next() { | |
| 1863 switch (_change_type) { | |
| 1864 case Start_Klass: // initial state; _klass is the new type | |
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1865 _ti_base = InstanceKlass::cast(_klass)->transitive_interfaces(); |
| 0 | 1866 _ti_index = 0; |
| 1867 _change_type = Change_new_type; | |
| 1868 return true; | |
| 1869 case Change_new_type: | |
| 1870 // fall through: | |
| 1871 _change_type = Change_new_sub; | |
| 1872 case Change_new_sub: | |
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1873 // 6598190: brackets workaround Sun Studio C++ compiler bug 6629277 |
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1874 { |
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1875 _klass = InstanceKlass::cast(_klass)->super(); |
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1876 if (_klass != NULL) { |
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1877 return true; |
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1878 } |
| 0 | 1879 } |
| 1880 // else set up _ti_limit and fall through: | |
| 1881 _ti_limit = (_ti_base == NULL) ? 0 : _ti_base->length(); | |
| 1882 _change_type = Change_new_impl; | |
| 1883 case Change_new_impl: | |
| 1884 if (_ti_index < _ti_limit) { | |
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1885 _klass = _ti_base->at(_ti_index++); |
| 0 | 1886 return true; |
| 1887 } | |
| 1888 // fall through: | |
| 1889 _change_type = NO_CHANGE; // iterator is exhausted | |
| 1890 case NO_CHANGE: | |
| 1891 break; | |
| 1892 default: | |
| 1893 ShouldNotReachHere(); | |
| 1894 } | |
| 1895 return false; | |
| 1896 } | |
| 1897 | |
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1898 void KlassDepChange::initialize() { |
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1899 // entire transaction must be under this lock: |
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1900 assert_lock_strong(Compile_lock); |
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1901 |
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1902 // Mark all dependee and all its superclasses |
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1903 // Mark transitive interfaces |
| 0 | 1904 for (ContextStream str(*this); str.next(); ) { |
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1905 Klass* d = str.klass(); |
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1906 assert(!InstanceKlass::cast(d)->is_marked_dependent(), "checking"); |
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1907 InstanceKlass::cast(d)->set_is_marked_dependent(true); |
| 0 | 1908 } |
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1909 } |
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1910 |
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1911 KlassDepChange::~KlassDepChange() { |
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1912 // Unmark all dependee and all its superclasses |
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1913 // Unmark transitive interfaces |
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1914 for (ContextStream str(*this); str.next(); ) { |
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1915 Klass* d = str.klass(); |
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1916 InstanceKlass::cast(d)->set_is_marked_dependent(false); |
| 0 | 1917 } |
| 1918 } | |
| 1919 | |
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1920 bool KlassDepChange::involves_context(Klass* k) { |
| 6983 | 1921 if (k == NULL || !k->oop_is_instance()) { |
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1922 return false; |
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1923 } |
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1924 InstanceKlass* ik = InstanceKlass::cast(k); |
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1925 bool is_contained = ik->is_marked_dependent(); |
| 6983 | 1926 assert(is_contained == new_type()->is_subtype_of(k), |
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1927 "correct marking of potential context types"); |
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1928 return is_contained; |
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1929 } |
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1930 |
| 0 | 1931 #ifndef PRODUCT |
| 1932 void Dependencies::print_statistics() { | |
| 1933 if (deps_find_witness_print != 0) { | |
| 1934 // Call one final time, to flush out the data. | |
| 1935 deps_find_witness_print = -1; | |
| 1936 count_find_witness_calls(); | |
| 1937 } | |
| 1938 } | |
| 1939 #endif |