Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiCodeBlobEvents.cpp @ 14330:9341a9963d36
8025841: JVMTI: "vtable stub" dynamic code notification is misplaced
Summary: Generate correct "vtable stub" dynamic code notifications
Reviewed-by: sspitsyn, kvn, coleenp
Contributed-by: oleg.mazurov@oracle.com
| author | sspitsyn |
|---|---|
| date | Thu, 06 Feb 2014 20:13:38 -0800 |
| parents | b9a9ed0f8eeb |
| children | d8041d695d19 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 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 "code/codeBlob.hpp" | |
| 27 #include "code/codeCache.hpp" | |
| 28 #include "code/scopeDesc.hpp" | |
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29 #include "code/vtableStubs.hpp" |
| 1972 | 30 #include "memory/resourceArea.hpp" |
| 31 #include "oops/oop.inline.hpp" | |
| 32 #include "prims/jvmtiCodeBlobEvents.hpp" | |
| 33 #include "prims/jvmtiExport.hpp" | |
| 34 #include "runtime/handles.hpp" | |
| 35 #include "runtime/handles.inline.hpp" | |
| 36 #include "runtime/vmThread.hpp" | |
| 0 | 37 |
| 38 // Support class to collect a list of the non-nmethod CodeBlobs in | |
| 39 // the CodeCache. | |
| 40 // | |
| 41 // This class actually creates a list of JvmtiCodeBlobDesc - each JvmtiCodeBlobDesc | |
| 42 // describes a single CodeBlob in the CodeCache. Note that collection is | |
| 43 // done to a static list - this is because CodeCache::blobs_do is defined | |
| 44 // as void CodeCache::blobs_do(void f(CodeBlob* nm)) and hence requires | |
| 45 // a C or static method. | |
| 46 // | |
| 47 // Usage :- | |
| 48 // | |
| 49 // CodeBlobCollector collector; | |
| 50 // | |
| 51 // collector.collect(); | |
| 52 // JvmtiCodeBlobDesc* blob = collector.first(); | |
| 53 // while (blob != NULL) { | |
| 54 // : | |
| 55 // blob = collector.next(); | |
| 56 // } | |
| 57 // | |
| 58 | |
| 59 class CodeBlobCollector : StackObj { | |
| 60 private: | |
| 61 GrowableArray<JvmtiCodeBlobDesc*>* _code_blobs; // collected blobs | |
| 62 int _pos; // iterator position | |
| 63 | |
| 64 // used during a collection | |
| 65 static GrowableArray<JvmtiCodeBlobDesc*>* _global_code_blobs; | |
| 66 static void do_blob(CodeBlob* cb); | |
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67 static void do_vtable_stub(VtableStub* vs); |
| 0 | 68 public: |
| 69 CodeBlobCollector() { | |
| 70 _code_blobs = NULL; | |
| 71 _pos = -1; | |
| 72 } | |
| 73 ~CodeBlobCollector() { | |
| 74 if (_code_blobs != NULL) { | |
| 75 for (int i=0; i<_code_blobs->length(); i++) { | |
| 76 FreeHeap(_code_blobs->at(i)); | |
| 77 } | |
| 78 delete _code_blobs; | |
| 79 } | |
| 80 } | |
| 81 | |
| 82 // collect list of code blobs in the cache | |
| 83 void collect(); | |
| 84 | |
| 85 // iteration support - return first code blob | |
| 86 JvmtiCodeBlobDesc* first() { | |
| 87 assert(_code_blobs != NULL, "not collected"); | |
| 88 if (_code_blobs->length() == 0) { | |
| 89 return NULL; | |
| 90 } | |
| 91 _pos = 0; | |
| 92 return _code_blobs->at(0); | |
| 93 } | |
| 94 | |
| 95 // iteration support - return next code blob | |
| 96 JvmtiCodeBlobDesc* next() { | |
| 97 assert(_pos >= 0, "iteration not started"); | |
| 98 if (_pos+1 >= _code_blobs->length()) { | |
| 99 return NULL; | |
| 100 } | |
| 101 return _code_blobs->at(++_pos); | |
| 102 } | |
| 103 | |
| 104 }; | |
| 105 | |
| 106 // used during collection | |
| 107 GrowableArray<JvmtiCodeBlobDesc*>* CodeBlobCollector::_global_code_blobs; | |
| 108 | |
| 109 | |
| 110 // called for each CodeBlob in the CodeCache | |
| 111 // | |
| 112 // This function filters out nmethods as it is only interested in | |
| 113 // other CodeBlobs. This function also filters out CodeBlobs that have | |
| 114 // a duplicate starting address as previous blobs. This is needed to | |
| 115 // handle the case where multiple stubs are generated into a single | |
| 116 // BufferBlob. | |
| 117 | |
| 118 void CodeBlobCollector::do_blob(CodeBlob* cb) { | |
| 119 | |
| 120 // ignore nmethods | |
| 121 if (cb->is_nmethod()) { | |
| 122 return; | |
| 123 } | |
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124 // exclude VtableStubs, which are processed separately |
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125 if (cb->is_buffer_blob() && strcmp(cb->name(), "vtable chunks") == 0) { |
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126 return; |
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127 } |
| 0 | 128 |
| 129 // check if this starting address has been seen already - the | |
| 130 // assumption is that stubs are inserted into the list before the | |
| 131 // enclosing BufferBlobs. | |
| 1748 | 132 address addr = cb->code_begin(); |
| 0 | 133 for (int i=0; i<_global_code_blobs->length(); i++) { |
| 134 JvmtiCodeBlobDesc* scb = _global_code_blobs->at(i); | |
| 135 if (addr == scb->code_begin()) { | |
| 136 return; | |
| 137 } | |
| 138 } | |
| 139 | |
| 140 // record the CodeBlob details as a JvmtiCodeBlobDesc | |
| 1748 | 141 JvmtiCodeBlobDesc* scb = new JvmtiCodeBlobDesc(cb->name(), cb->code_begin(), cb->code_end()); |
| 0 | 142 _global_code_blobs->append(scb); |
| 143 } | |
| 144 | |
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145 // called for each VtableStub in VtableStubs |
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146 |
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147 void CodeBlobCollector::do_vtable_stub(VtableStub* vs) { |
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148 JvmtiCodeBlobDesc* scb = new JvmtiCodeBlobDesc(vs->is_vtable_stub() ? "vtable stub" : "itable stub", |
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149 vs->code_begin(), vs->code_end()); |
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150 _global_code_blobs->append(scb); |
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151 } |
| 0 | 152 |
| 153 // collects a list of CodeBlobs in the CodeCache. | |
| 154 // | |
| 155 // The created list is growable array of JvmtiCodeBlobDesc - each one describes | |
| 156 // a CodeBlob. Note that the list is static - this is because CodeBlob::blobs_do | |
| 157 // requires a a C or static function so we can't use an instance function. This | |
| 158 // isn't a problem as the iteration is serial anyway as we need the CodeCache_lock | |
| 159 // to iterate over the code cache. | |
| 160 // | |
| 161 // Note that the CodeBlobs in the CodeCache will include BufferBlobs that may | |
| 162 // contain multiple stubs. As a profiler is interested in the stubs rather than | |
| 163 // the enclosing container we first iterate over the stub code descriptors so | |
| 164 // that the stubs go into the list first. do_blob will then filter out the | |
| 165 // enclosing blobs if the starting address of the enclosing blobs matches the | |
| 166 // starting address of first stub generated in the enclosing blob. | |
| 167 | |
| 168 void CodeBlobCollector::collect() { | |
| 169 assert_locked_or_safepoint(CodeCache_lock); | |
| 170 assert(_global_code_blobs == NULL, "checking"); | |
| 171 | |
| 172 // create the global list | |
| 6197 | 173 _global_code_blobs = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JvmtiCodeBlobDesc*>(50,true); |
| 0 | 174 |
| 175 // iterate over the stub code descriptors and put them in the list first. | |
| 176 int index = 0; | |
| 177 StubCodeDesc* desc; | |
| 178 while ((desc = StubCodeDesc::desc_for_index(++index)) != NULL) { | |
| 179 _global_code_blobs->append(new JvmtiCodeBlobDesc(desc->name(), desc->begin(), desc->end())); | |
| 180 } | |
| 181 | |
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182 // Vtable stubs are not described with StubCodeDesc, |
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183 // process them separately |
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184 VtableStubs::vtable_stub_do(do_vtable_stub); |
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185 |
| 0 | 186 // next iterate over all the non-nmethod code blobs and add them to |
| 187 // the list - as noted above this will filter out duplicates and | |
| 188 // enclosing blobs. | |
| 189 CodeCache::blobs_do(do_blob); | |
| 190 | |
| 191 // make the global list the instance list so that it can be used | |
| 192 // for other iterations. | |
| 193 _code_blobs = _global_code_blobs; | |
| 194 _global_code_blobs = NULL; | |
| 195 } | |
| 196 | |
| 197 | |
| 198 // Generate a DYNAMIC_CODE_GENERATED event for each non-nmethod code blob. | |
| 199 | |
| 200 jvmtiError JvmtiCodeBlobEvents::generate_dynamic_code_events(JvmtiEnv* env) { | |
| 201 CodeBlobCollector collector; | |
| 202 | |
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203 // First collect all the code blobs. This has to be done in a |
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204 // single pass over the code cache with CodeCache_lock held because |
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205 // there isn't any safe way to iterate over regular CodeBlobs since |
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206 // they can be freed at any point. |
| 0 | 207 { |
| 208 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 209 collector.collect(); | |
| 210 } | |
| 211 | |
| 212 // iterate over the collected list and post an event for each blob | |
| 213 JvmtiCodeBlobDesc* blob = collector.first(); | |
| 214 while (blob != NULL) { | |
| 215 JvmtiExport::post_dynamic_code_generated(env, blob->name(), blob->code_begin(), blob->code_end()); | |
| 216 blob = collector.next(); | |
| 217 } | |
| 218 return JVMTI_ERROR_NONE; | |
| 219 } | |
| 220 | |
| 221 | |
| 222 // Generate a COMPILED_METHOD_LOAD event for each nnmethod | |
| 223 jvmtiError JvmtiCodeBlobEvents::generate_compiled_method_load_events(JvmtiEnv* env) { | |
| 224 HandleMark hm; | |
| 225 | |
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226 // Walk the CodeCache notifying for live nmethods. The code cache |
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227 // may be changing while this is happening which is ok since newly |
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228 // created nmethod will notify normally and nmethods which are freed |
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229 // can be safely skipped. |
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230 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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231 nmethod* current = CodeCache::first_nmethod(); |
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232 while (current != NULL) { |
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233 // Only notify for live nmethods |
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234 if (current->is_alive()) { |
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235 // Lock the nmethod so it can't be freed |
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236 nmethodLocker nml(current); |
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237 |
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238 // Don't hold the lock over the notify or jmethodID creation |
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239 MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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240 current->get_and_cache_jmethod_id(); |
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241 JvmtiExport::post_compiled_method_load(current); |
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242 } |
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243 current = CodeCache::next_nmethod(current); |
| 0 | 244 } |
| 245 return JVMTI_ERROR_NONE; | |
| 246 } | |
| 247 | |
| 248 | |
| 249 // create a C-heap allocated address location map for an nmethod | |
| 250 void JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nmethod *nm, | |
| 251 jvmtiAddrLocationMap** map_ptr, | |
| 252 jint *map_length_ptr) | |
| 253 { | |
| 254 ResourceMark rm; | |
| 255 jvmtiAddrLocationMap* map = NULL; | |
| 256 jint map_length = 0; | |
| 257 | |
| 258 | |
| 259 // Generate line numbers using PcDesc and ScopeDesc info | |
| 260 methodHandle mh(nm->method()); | |
| 261 | |
| 262 if (!mh->is_native()) { | |
| 263 PcDesc *pcd; | |
| 264 int pcds_in_method; | |
| 265 | |
| 266 pcds_in_method = (nm->scopes_pcs_end() - nm->scopes_pcs_begin()); | |
| 6197 | 267 map = NEW_C_HEAP_ARRAY(jvmtiAddrLocationMap, pcds_in_method, mtInternal); |
| 0 | 268 |
| 269 address scopes_data = nm->scopes_data_begin(); | |
| 270 for( pcd = nm->scopes_pcs_begin(); pcd < nm->scopes_pcs_end(); ++pcd ) { | |
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271 ScopeDesc sc0(nm, pcd->scope_decode_offset(), pcd->should_reexecute(), pcd->return_oop()); |
| 0 | 272 ScopeDesc *sd = &sc0; |
| 273 while( !sd->is_top() ) { sd = sd->sender(); } | |
| 274 int bci = sd->bci(); | |
| 275 if (bci != InvocationEntryBci) { | |
| 276 assert(map_length < pcds_in_method, "checking"); | |
| 277 map[map_length].start_address = (const void*)pcd->real_pc(nm); | |
| 278 map[map_length].location = bci; | |
| 279 ++map_length; | |
| 280 } | |
| 281 } | |
| 282 } | |
| 283 | |
| 284 *map_ptr = map; | |
| 285 *map_length_ptr = map_length; | |
| 286 } |