Mercurial > hg > graal-compiler
annotate src/share/vm/prims/jvmtiCodeBlobEvents.cpp @ 1766:02f0a9b6f654
6969586: OptimizeStringConcat: SIGSEGV in LoadNode::Value()
Reviewed-by: kvn
author | never |
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date | Mon, 30 Aug 2010 17:27:35 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2010, 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 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_jvmtiCodeBlobEvents.cpp.incl" | |
27 | |
28 // Support class to collect a list of the non-nmethod CodeBlobs in | |
29 // the CodeCache. | |
30 // | |
31 // This class actually creates a list of JvmtiCodeBlobDesc - each JvmtiCodeBlobDesc | |
32 // describes a single CodeBlob in the CodeCache. Note that collection is | |
33 // done to a static list - this is because CodeCache::blobs_do is defined | |
34 // as void CodeCache::blobs_do(void f(CodeBlob* nm)) and hence requires | |
35 // a C or static method. | |
36 // | |
37 // Usage :- | |
38 // | |
39 // CodeBlobCollector collector; | |
40 // | |
41 // collector.collect(); | |
42 // JvmtiCodeBlobDesc* blob = collector.first(); | |
43 // while (blob != NULL) { | |
44 // : | |
45 // blob = collector.next(); | |
46 // } | |
47 // | |
48 | |
49 class CodeBlobCollector : StackObj { | |
50 private: | |
51 GrowableArray<JvmtiCodeBlobDesc*>* _code_blobs; // collected blobs | |
52 int _pos; // iterator position | |
53 | |
54 // used during a collection | |
55 static GrowableArray<JvmtiCodeBlobDesc*>* _global_code_blobs; | |
56 static void do_blob(CodeBlob* cb); | |
57 public: | |
58 CodeBlobCollector() { | |
59 _code_blobs = NULL; | |
60 _pos = -1; | |
61 } | |
62 ~CodeBlobCollector() { | |
63 if (_code_blobs != NULL) { | |
64 for (int i=0; i<_code_blobs->length(); i++) { | |
65 FreeHeap(_code_blobs->at(i)); | |
66 } | |
67 delete _code_blobs; | |
68 } | |
69 } | |
70 | |
71 // collect list of code blobs in the cache | |
72 void collect(); | |
73 | |
74 // iteration support - return first code blob | |
75 JvmtiCodeBlobDesc* first() { | |
76 assert(_code_blobs != NULL, "not collected"); | |
77 if (_code_blobs->length() == 0) { | |
78 return NULL; | |
79 } | |
80 _pos = 0; | |
81 return _code_blobs->at(0); | |
82 } | |
83 | |
84 // iteration support - return next code blob | |
85 JvmtiCodeBlobDesc* next() { | |
86 assert(_pos >= 0, "iteration not started"); | |
87 if (_pos+1 >= _code_blobs->length()) { | |
88 return NULL; | |
89 } | |
90 return _code_blobs->at(++_pos); | |
91 } | |
92 | |
93 }; | |
94 | |
95 // used during collection | |
96 GrowableArray<JvmtiCodeBlobDesc*>* CodeBlobCollector::_global_code_blobs; | |
97 | |
98 | |
99 // called for each CodeBlob in the CodeCache | |
100 // | |
101 // This function filters out nmethods as it is only interested in | |
102 // other CodeBlobs. This function also filters out CodeBlobs that have | |
103 // a duplicate starting address as previous blobs. This is needed to | |
104 // handle the case where multiple stubs are generated into a single | |
105 // BufferBlob. | |
106 | |
107 void CodeBlobCollector::do_blob(CodeBlob* cb) { | |
108 | |
109 // ignore nmethods | |
110 if (cb->is_nmethod()) { | |
111 return; | |
112 } | |
113 | |
114 // check if this starting address has been seen already - the | |
115 // assumption is that stubs are inserted into the list before the | |
116 // enclosing BufferBlobs. | |
1748 | 117 address addr = cb->code_begin(); |
0 | 118 for (int i=0; i<_global_code_blobs->length(); i++) { |
119 JvmtiCodeBlobDesc* scb = _global_code_blobs->at(i); | |
120 if (addr == scb->code_begin()) { | |
121 return; | |
122 } | |
123 } | |
124 | |
125 // record the CodeBlob details as a JvmtiCodeBlobDesc | |
1748 | 126 JvmtiCodeBlobDesc* scb = new JvmtiCodeBlobDesc(cb->name(), cb->code_begin(), cb->code_end()); |
0 | 127 _global_code_blobs->append(scb); |
128 } | |
129 | |
130 | |
131 // collects a list of CodeBlobs in the CodeCache. | |
132 // | |
133 // The created list is growable array of JvmtiCodeBlobDesc - each one describes | |
134 // a CodeBlob. Note that the list is static - this is because CodeBlob::blobs_do | |
135 // requires a a C or static function so we can't use an instance function. This | |
136 // isn't a problem as the iteration is serial anyway as we need the CodeCache_lock | |
137 // to iterate over the code cache. | |
138 // | |
139 // Note that the CodeBlobs in the CodeCache will include BufferBlobs that may | |
140 // contain multiple stubs. As a profiler is interested in the stubs rather than | |
141 // the enclosing container we first iterate over the stub code descriptors so | |
142 // that the stubs go into the list first. do_blob will then filter out the | |
143 // enclosing blobs if the starting address of the enclosing blobs matches the | |
144 // starting address of first stub generated in the enclosing blob. | |
145 | |
146 void CodeBlobCollector::collect() { | |
147 assert_locked_or_safepoint(CodeCache_lock); | |
148 assert(_global_code_blobs == NULL, "checking"); | |
149 | |
150 // create the global list | |
151 _global_code_blobs = new (ResourceObj::C_HEAP) GrowableArray<JvmtiCodeBlobDesc*>(50,true); | |
152 | |
153 // iterate over the stub code descriptors and put them in the list first. | |
154 int index = 0; | |
155 StubCodeDesc* desc; | |
156 while ((desc = StubCodeDesc::desc_for_index(++index)) != NULL) { | |
157 _global_code_blobs->append(new JvmtiCodeBlobDesc(desc->name(), desc->begin(), desc->end())); | |
158 } | |
159 | |
160 // next iterate over all the non-nmethod code blobs and add them to | |
161 // the list - as noted above this will filter out duplicates and | |
162 // enclosing blobs. | |
163 CodeCache::blobs_do(do_blob); | |
164 | |
165 // make the global list the instance list so that it can be used | |
166 // for other iterations. | |
167 _code_blobs = _global_code_blobs; | |
168 _global_code_blobs = NULL; | |
169 } | |
170 | |
171 | |
172 // Generate a DYNAMIC_CODE_GENERATED event for each non-nmethod code blob. | |
173 | |
174 jvmtiError JvmtiCodeBlobEvents::generate_dynamic_code_events(JvmtiEnv* env) { | |
175 CodeBlobCollector collector; | |
176 | |
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177 // First collect all the code blobs. This has to be done in a |
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178 // single pass over the code cache with CodeCache_lock held because |
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179 // there isn't any safe way to iterate over regular CodeBlobs since |
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180 // they can be freed at any point. |
0 | 181 { |
182 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
183 collector.collect(); | |
184 } | |
185 | |
186 // iterate over the collected list and post an event for each blob | |
187 JvmtiCodeBlobDesc* blob = collector.first(); | |
188 while (blob != NULL) { | |
189 JvmtiExport::post_dynamic_code_generated(env, blob->name(), blob->code_begin(), blob->code_end()); | |
190 blob = collector.next(); | |
191 } | |
192 return JVMTI_ERROR_NONE; | |
193 } | |
194 | |
195 | |
196 // Generate a COMPILED_METHOD_LOAD event for each nnmethod | |
197 jvmtiError JvmtiCodeBlobEvents::generate_compiled_method_load_events(JvmtiEnv* env) { | |
198 HandleMark hm; | |
199 | |
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200 // Walk the CodeCache notifying for live nmethods. The code cache |
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201 // may be changing while this is happening which is ok since newly |
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202 // created nmethod will notify normally and nmethods which are freed |
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203 // can be safely skipped. |
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204 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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205 nmethod* current = CodeCache::first_nmethod(); |
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206 while (current != NULL) { |
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207 // Only notify for live nmethods |
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208 if (current->is_alive()) { |
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209 // Lock the nmethod so it can't be freed |
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210 nmethodLocker nml(current); |
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211 |
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212 // Don't hold the lock over the notify or jmethodID creation |
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213 MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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214 current->get_and_cache_jmethod_id(); |
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215 JvmtiExport::post_compiled_method_load(current); |
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216 } |
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217 current = CodeCache::next_nmethod(current); |
0 | 218 } |
219 return JVMTI_ERROR_NONE; | |
220 } | |
221 | |
222 | |
223 // create a C-heap allocated address location map for an nmethod | |
224 void JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nmethod *nm, | |
225 jvmtiAddrLocationMap** map_ptr, | |
226 jint *map_length_ptr) | |
227 { | |
228 ResourceMark rm; | |
229 jvmtiAddrLocationMap* map = NULL; | |
230 jint map_length = 0; | |
231 | |
232 | |
233 // Generate line numbers using PcDesc and ScopeDesc info | |
234 methodHandle mh(nm->method()); | |
235 | |
236 if (!mh->is_native()) { | |
237 PcDesc *pcd; | |
238 int pcds_in_method; | |
239 | |
240 pcds_in_method = (nm->scopes_pcs_end() - nm->scopes_pcs_begin()); | |
241 map = NEW_C_HEAP_ARRAY(jvmtiAddrLocationMap, pcds_in_method); | |
242 | |
243 address scopes_data = nm->scopes_data_begin(); | |
244 for( pcd = nm->scopes_pcs_begin(); pcd < nm->scopes_pcs_end(); ++pcd ) { | |
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245 ScopeDesc sc0(nm, pcd->scope_decode_offset(), pcd->should_reexecute(), pcd->return_oop()); |
0 | 246 ScopeDesc *sd = &sc0; |
247 while( !sd->is_top() ) { sd = sd->sender(); } | |
248 int bci = sd->bci(); | |
249 if (bci != InvocationEntryBci) { | |
250 assert(map_length < pcds_in_method, "checking"); | |
251 map[map_length].start_address = (const void*)pcd->real_pc(nm); | |
252 map[map_length].location = bci; | |
253 ++map_length; | |
254 } | |
255 } | |
256 } | |
257 | |
258 *map_ptr = map; | |
259 *map_length_ptr = map_length; | |
260 } |