Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiCodeBlobEvents.cpp @ 3456:782e2bb60c41
7052494: Eclipse test fails on JDK 7 b142
Summary: Keep 'ne' test in Counted loop when we can't guarantee during compilation that init < limit.
Reviewed-by: never
author | kvn |
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date | Mon, 20 Jun 2011 16:45:35 -0700 |
parents | f95d63e2154a |
children | 5857923e563c d2a62e0f25eb |
rev | line source |
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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 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "code/codeBlob.hpp" | |
27 #include "code/codeCache.hpp" | |
28 #include "code/scopeDesc.hpp" | |
29 #include "memory/resourceArea.hpp" | |
30 #include "oops/oop.inline.hpp" | |
31 #include "prims/jvmtiCodeBlobEvents.hpp" | |
32 #include "prims/jvmtiExport.hpp" | |
33 #include "runtime/handles.hpp" | |
34 #include "runtime/handles.inline.hpp" | |
35 #include "runtime/vmThread.hpp" | |
0 | 36 |
37 // Support class to collect a list of the non-nmethod CodeBlobs in | |
38 // the CodeCache. | |
39 // | |
40 // This class actually creates a list of JvmtiCodeBlobDesc - each JvmtiCodeBlobDesc | |
41 // describes a single CodeBlob in the CodeCache. Note that collection is | |
42 // done to a static list - this is because CodeCache::blobs_do is defined | |
43 // as void CodeCache::blobs_do(void f(CodeBlob* nm)) and hence requires | |
44 // a C or static method. | |
45 // | |
46 // Usage :- | |
47 // | |
48 // CodeBlobCollector collector; | |
49 // | |
50 // collector.collect(); | |
51 // JvmtiCodeBlobDesc* blob = collector.first(); | |
52 // while (blob != NULL) { | |
53 // : | |
54 // blob = collector.next(); | |
55 // } | |
56 // | |
57 | |
58 class CodeBlobCollector : StackObj { | |
59 private: | |
60 GrowableArray<JvmtiCodeBlobDesc*>* _code_blobs; // collected blobs | |
61 int _pos; // iterator position | |
62 | |
63 // used during a collection | |
64 static GrowableArray<JvmtiCodeBlobDesc*>* _global_code_blobs; | |
65 static void do_blob(CodeBlob* cb); | |
66 public: | |
67 CodeBlobCollector() { | |
68 _code_blobs = NULL; | |
69 _pos = -1; | |
70 } | |
71 ~CodeBlobCollector() { | |
72 if (_code_blobs != NULL) { | |
73 for (int i=0; i<_code_blobs->length(); i++) { | |
74 FreeHeap(_code_blobs->at(i)); | |
75 } | |
76 delete _code_blobs; | |
77 } | |
78 } | |
79 | |
80 // collect list of code blobs in the cache | |
81 void collect(); | |
82 | |
83 // iteration support - return first code blob | |
84 JvmtiCodeBlobDesc* first() { | |
85 assert(_code_blobs != NULL, "not collected"); | |
86 if (_code_blobs->length() == 0) { | |
87 return NULL; | |
88 } | |
89 _pos = 0; | |
90 return _code_blobs->at(0); | |
91 } | |
92 | |
93 // iteration support - return next code blob | |
94 JvmtiCodeBlobDesc* next() { | |
95 assert(_pos >= 0, "iteration not started"); | |
96 if (_pos+1 >= _code_blobs->length()) { | |
97 return NULL; | |
98 } | |
99 return _code_blobs->at(++_pos); | |
100 } | |
101 | |
102 }; | |
103 | |
104 // used during collection | |
105 GrowableArray<JvmtiCodeBlobDesc*>* CodeBlobCollector::_global_code_blobs; | |
106 | |
107 | |
108 // called for each CodeBlob in the CodeCache | |
109 // | |
110 // This function filters out nmethods as it is only interested in | |
111 // other CodeBlobs. This function also filters out CodeBlobs that have | |
112 // a duplicate starting address as previous blobs. This is needed to | |
113 // handle the case where multiple stubs are generated into a single | |
114 // BufferBlob. | |
115 | |
116 void CodeBlobCollector::do_blob(CodeBlob* cb) { | |
117 | |
118 // ignore nmethods | |
119 if (cb->is_nmethod()) { | |
120 return; | |
121 } | |
122 | |
123 // check if this starting address has been seen already - the | |
124 // assumption is that stubs are inserted into the list before the | |
125 // enclosing BufferBlobs. | |
1748 | 126 address addr = cb->code_begin(); |
0 | 127 for (int i=0; i<_global_code_blobs->length(); i++) { |
128 JvmtiCodeBlobDesc* scb = _global_code_blobs->at(i); | |
129 if (addr == scb->code_begin()) { | |
130 return; | |
131 } | |
132 } | |
133 | |
134 // record the CodeBlob details as a JvmtiCodeBlobDesc | |
1748 | 135 JvmtiCodeBlobDesc* scb = new JvmtiCodeBlobDesc(cb->name(), cb->code_begin(), cb->code_end()); |
0 | 136 _global_code_blobs->append(scb); |
137 } | |
138 | |
139 | |
140 // collects a list of CodeBlobs in the CodeCache. | |
141 // | |
142 // The created list is growable array of JvmtiCodeBlobDesc - each one describes | |
143 // a CodeBlob. Note that the list is static - this is because CodeBlob::blobs_do | |
144 // requires a a C or static function so we can't use an instance function. This | |
145 // isn't a problem as the iteration is serial anyway as we need the CodeCache_lock | |
146 // to iterate over the code cache. | |
147 // | |
148 // Note that the CodeBlobs in the CodeCache will include BufferBlobs that may | |
149 // contain multiple stubs. As a profiler is interested in the stubs rather than | |
150 // the enclosing container we first iterate over the stub code descriptors so | |
151 // that the stubs go into the list first. do_blob will then filter out the | |
152 // enclosing blobs if the starting address of the enclosing blobs matches the | |
153 // starting address of first stub generated in the enclosing blob. | |
154 | |
155 void CodeBlobCollector::collect() { | |
156 assert_locked_or_safepoint(CodeCache_lock); | |
157 assert(_global_code_blobs == NULL, "checking"); | |
158 | |
159 // create the global list | |
160 _global_code_blobs = new (ResourceObj::C_HEAP) GrowableArray<JvmtiCodeBlobDesc*>(50,true); | |
161 | |
162 // iterate over the stub code descriptors and put them in the list first. | |
163 int index = 0; | |
164 StubCodeDesc* desc; | |
165 while ((desc = StubCodeDesc::desc_for_index(++index)) != NULL) { | |
166 _global_code_blobs->append(new JvmtiCodeBlobDesc(desc->name(), desc->begin(), desc->end())); | |
167 } | |
168 | |
169 // next iterate over all the non-nmethod code blobs and add them to | |
170 // the list - as noted above this will filter out duplicates and | |
171 // enclosing blobs. | |
172 CodeCache::blobs_do(do_blob); | |
173 | |
174 // make the global list the instance list so that it can be used | |
175 // for other iterations. | |
176 _code_blobs = _global_code_blobs; | |
177 _global_code_blobs = NULL; | |
178 } | |
179 | |
180 | |
181 // Generate a DYNAMIC_CODE_GENERATED event for each non-nmethod code blob. | |
182 | |
183 jvmtiError JvmtiCodeBlobEvents::generate_dynamic_code_events(JvmtiEnv* env) { | |
184 CodeBlobCollector collector; | |
185 | |
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186 // First collect all the code blobs. This has to be done in a |
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187 // single pass over the code cache with CodeCache_lock held because |
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188 // there isn't any safe way to iterate over regular CodeBlobs since |
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189 // they can be freed at any point. |
0 | 190 { |
191 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
192 collector.collect(); | |
193 } | |
194 | |
195 // iterate over the collected list and post an event for each blob | |
196 JvmtiCodeBlobDesc* blob = collector.first(); | |
197 while (blob != NULL) { | |
198 JvmtiExport::post_dynamic_code_generated(env, blob->name(), blob->code_begin(), blob->code_end()); | |
199 blob = collector.next(); | |
200 } | |
201 return JVMTI_ERROR_NONE; | |
202 } | |
203 | |
204 | |
205 // Generate a COMPILED_METHOD_LOAD event for each nnmethod | |
206 jvmtiError JvmtiCodeBlobEvents::generate_compiled_method_load_events(JvmtiEnv* env) { | |
207 HandleMark hm; | |
208 | |
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209 // Walk the CodeCache notifying for live nmethods. The code cache |
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210 // may be changing while this is happening which is ok since newly |
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211 // created nmethod will notify normally and nmethods which are freed |
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212 // can be safely skipped. |
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213 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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214 nmethod* current = CodeCache::first_nmethod(); |
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215 while (current != NULL) { |
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216 // Only notify for live nmethods |
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217 if (current->is_alive()) { |
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218 // Lock the nmethod so it can't be freed |
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219 nmethodLocker nml(current); |
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220 |
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221 // Don't hold the lock over the notify or jmethodID creation |
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222 MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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223 current->get_and_cache_jmethod_id(); |
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224 JvmtiExport::post_compiled_method_load(current); |
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225 } |
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226 current = CodeCache::next_nmethod(current); |
0 | 227 } |
228 return JVMTI_ERROR_NONE; | |
229 } | |
230 | |
231 | |
232 // create a C-heap allocated address location map for an nmethod | |
233 void JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nmethod *nm, | |
234 jvmtiAddrLocationMap** map_ptr, | |
235 jint *map_length_ptr) | |
236 { | |
237 ResourceMark rm; | |
238 jvmtiAddrLocationMap* map = NULL; | |
239 jint map_length = 0; | |
240 | |
241 | |
242 // Generate line numbers using PcDesc and ScopeDesc info | |
243 methodHandle mh(nm->method()); | |
244 | |
245 if (!mh->is_native()) { | |
246 PcDesc *pcd; | |
247 int pcds_in_method; | |
248 | |
249 pcds_in_method = (nm->scopes_pcs_end() - nm->scopes_pcs_begin()); | |
250 map = NEW_C_HEAP_ARRAY(jvmtiAddrLocationMap, pcds_in_method); | |
251 | |
252 address scopes_data = nm->scopes_data_begin(); | |
253 for( pcd = nm->scopes_pcs_begin(); pcd < nm->scopes_pcs_end(); ++pcd ) { | |
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254 ScopeDesc sc0(nm, pcd->scope_decode_offset(), pcd->should_reexecute(), pcd->return_oop()); |
0 | 255 ScopeDesc *sd = &sc0; |
256 while( !sd->is_top() ) { sd = sd->sender(); } | |
257 int bci = sd->bci(); | |
258 if (bci != InvocationEntryBci) { | |
259 assert(map_length < pcds_in_method, "checking"); | |
260 map[map_length].start_address = (const void*)pcd->real_pc(nm); | |
261 map[map_length].location = bci; | |
262 ++map_length; | |
263 } | |
264 } | |
265 } | |
266 | |
267 *map_ptr = map; | |
268 *map_length_ptr = map_length; | |
269 } |