Mercurial > hg > graal-compiler
annotate src/share/vm/oops/methodData.cpp @ 12294:891687731b59
7009641: Don't fail VM when CodeCache is full
Summary: Allocation in the code cache returns NULL instead of failing the entire VM
Reviewed-by: kvn, iveresov
author | anoll |
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date | Tue, 24 Sep 2013 15:56:25 +0200 |
parents | a1ebd310d5c1 |
children | 836a62f43af9 d13d7aba8c12 abe03600372a |
rev | line source |
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0 | 1 /* |
7956 | 2 * Copyright (c) 2000, 2013, 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 "classfile/systemDictionary.hpp" | |
27 #include "interpreter/bytecode.hpp" | |
28 #include "interpreter/bytecodeStream.hpp" | |
29 #include "interpreter/linkResolver.hpp" | |
7956 | 30 #include "memory/heapInspection.hpp" |
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31 #include "oops/methodData.hpp" |
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32 #include "prims/jvmtiRedefineClasses.hpp" |
1972 | 33 #include "runtime/compilationPolicy.hpp" |
34 #include "runtime/deoptimization.hpp" | |
35 #include "runtime/handles.inline.hpp" | |
0 | 36 |
37 // ================================================================== | |
38 // DataLayout | |
39 // | |
40 // Overlay for generic profiling data. | |
41 | |
42 // Some types of data layouts need a length field. | |
43 bool DataLayout::needs_array_len(u1 tag) { | |
45
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44 return (tag == multi_branch_data_tag) || (tag == arg_info_data_tag); |
0 | 45 } |
46 | |
47 // Perform generic initialization of the data. More specific | |
48 // initialization occurs in overrides of ProfileData::post_initialize. | |
49 void DataLayout::initialize(u1 tag, u2 bci, int cell_count) { | |
50 _header._bits = (intptr_t)0; | |
51 _header._struct._tag = tag; | |
52 _header._struct._bci = bci; | |
53 for (int i = 0; i < cell_count; i++) { | |
54 set_cell_at(i, (intptr_t)0); | |
55 } | |
56 if (needs_array_len(tag)) { | |
57 set_cell_at(ArrayData::array_len_off_set, cell_count - 1); // -1 for header. | |
58 } | |
59 } | |
60 | |
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61 void DataLayout::clean_weak_klass_links(BoolObjectClosure* cl) { |
941 | 62 ResourceMark m; |
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63 data_in()->clean_weak_klass_links(cl); |
941 | 64 } |
65 | |
66 | |
0 | 67 // ================================================================== |
68 // ProfileData | |
69 // | |
70 // A ProfileData object is created to refer to a section of profiling | |
71 // data in a structured way. | |
72 | |
73 // Constructor for invalid ProfileData. | |
74 ProfileData::ProfileData() { | |
75 _data = NULL; | |
76 } | |
77 | |
78 #ifndef PRODUCT | |
79 void ProfileData::print_shared(outputStream* st, const char* name) { | |
80 st->print("bci: %d", bci()); | |
81 st->fill_to(tab_width_one); | |
82 st->print("%s", name); | |
83 tab(st); | |
84 int trap = trap_state(); | |
85 if (trap != 0) { | |
86 char buf[100]; | |
87 st->print("trap(%s) ", Deoptimization::format_trap_state(buf, sizeof(buf), trap)); | |
88 } | |
89 int flags = data()->flags(); | |
90 if (flags != 0) | |
91 st->print("flags(%d) ", flags); | |
92 } | |
93 | |
94 void ProfileData::tab(outputStream* st) { | |
95 st->fill_to(tab_width_two); | |
96 } | |
97 #endif // !PRODUCT | |
98 | |
99 // ================================================================== | |
100 // BitData | |
101 // | |
102 // A BitData corresponds to a one-bit flag. This is used to indicate | |
103 // whether a checkcast bytecode has seen a null value. | |
104 | |
105 | |
106 #ifndef PRODUCT | |
107 void BitData::print_data_on(outputStream* st) { | |
108 print_shared(st, "BitData"); | |
109 } | |
110 #endif // !PRODUCT | |
111 | |
112 // ================================================================== | |
113 // CounterData | |
114 // | |
115 // A CounterData corresponds to a simple counter. | |
116 | |
117 #ifndef PRODUCT | |
118 void CounterData::print_data_on(outputStream* st) { | |
119 print_shared(st, "CounterData"); | |
120 st->print_cr("count(%u)", count()); | |
121 } | |
122 #endif // !PRODUCT | |
123 | |
124 // ================================================================== | |
125 // JumpData | |
126 // | |
127 // A JumpData is used to access profiling information for a direct | |
128 // branch. It is a counter, used for counting the number of branches, | |
129 // plus a data displacement, used for realigning the data pointer to | |
130 // the corresponding target bci. | |
131 | |
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132 void JumpData::post_initialize(BytecodeStream* stream, MethodData* mdo) { |
0 | 133 assert(stream->bci() == bci(), "wrong pos"); |
134 int target; | |
135 Bytecodes::Code c = stream->code(); | |
136 if (c == Bytecodes::_goto_w || c == Bytecodes::_jsr_w) { | |
137 target = stream->dest_w(); | |
138 } else { | |
139 target = stream->dest(); | |
140 } | |
141 int my_di = mdo->dp_to_di(dp()); | |
142 int target_di = mdo->bci_to_di(target); | |
143 int offset = target_di - my_di; | |
144 set_displacement(offset); | |
145 } | |
146 | |
147 #ifndef PRODUCT | |
148 void JumpData::print_data_on(outputStream* st) { | |
149 print_shared(st, "JumpData"); | |
150 st->print_cr("taken(%u) displacement(%d)", taken(), displacement()); | |
151 } | |
152 #endif // !PRODUCT | |
153 | |
154 // ================================================================== | |
155 // ReceiverTypeData | |
156 // | |
157 // A ReceiverTypeData is used to access profiling information about a | |
158 // dynamic type check. It consists of a counter which counts the total times | |
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159 // that the check is reached, and a series of (Klass*, count) pairs |
0 | 160 // which are used to store a type profile for the receiver of the check. |
161 | |
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162 void ReceiverTypeData::clean_weak_klass_links(BoolObjectClosure* is_alive_cl) { |
941 | 163 for (uint row = 0; row < row_limit(); row++) { |
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164 Klass* p = receiver(row); |
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165 if (p != NULL && !p->is_loader_alive(is_alive_cl)) { |
941 | 166 clear_row(row); |
167 } | |
168 } | |
169 } | |
170 | |
0 | 171 #ifndef PRODUCT |
172 void ReceiverTypeData::print_receiver_data_on(outputStream* st) { | |
173 uint row; | |
174 int entries = 0; | |
175 for (row = 0; row < row_limit(); row++) { | |
176 if (receiver(row) != NULL) entries++; | |
177 } | |
178 st->print_cr("count(%u) entries(%u)", count(), entries); | |
1783 | 179 int total = count(); |
180 for (row = 0; row < row_limit(); row++) { | |
181 if (receiver(row) != NULL) { | |
182 total += receiver_count(row); | |
183 } | |
184 } | |
0 | 185 for (row = 0; row < row_limit(); row++) { |
186 if (receiver(row) != NULL) { | |
187 tab(st); | |
188 receiver(row)->print_value_on(st); | |
1783 | 189 st->print_cr("(%u %4.2f)", receiver_count(row), (float) receiver_count(row) / (float) total); |
0 | 190 } |
191 } | |
192 } | |
193 void ReceiverTypeData::print_data_on(outputStream* st) { | |
194 print_shared(st, "ReceiverTypeData"); | |
195 print_receiver_data_on(st); | |
196 } | |
197 void VirtualCallData::print_data_on(outputStream* st) { | |
198 print_shared(st, "VirtualCallData"); | |
199 print_receiver_data_on(st); | |
200 } | |
201 #endif // !PRODUCT | |
202 | |
203 // ================================================================== | |
204 // RetData | |
205 // | |
206 // A RetData is used to access profiling information for a ret bytecode. | |
207 // It is composed of a count of the number of times that the ret has | |
208 // been executed, followed by a series of triples of the form | |
209 // (bci, count, di) which count the number of times that some bci was the | |
210 // target of the ret and cache a corresponding displacement. | |
211 | |
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212 void RetData::post_initialize(BytecodeStream* stream, MethodData* mdo) { |
0 | 213 for (uint row = 0; row < row_limit(); row++) { |
214 set_bci_displacement(row, -1); | |
215 set_bci(row, no_bci); | |
216 } | |
217 // release so other threads see a consistent state. bci is used as | |
218 // a valid flag for bci_displacement. | |
219 OrderAccess::release(); | |
220 } | |
221 | |
222 // This routine needs to atomically update the RetData structure, so the | |
223 // caller needs to hold the RetData_lock before it gets here. Since taking | |
224 // the lock can block (and allow GC) and since RetData is a ProfileData is a | |
225 // wrapper around a derived oop, taking the lock in _this_ method will | |
226 // basically cause the 'this' pointer's _data field to contain junk after the | |
227 // lock. We require the caller to take the lock before making the ProfileData | |
228 // structure. Currently the only caller is InterpreterRuntime::update_mdp_for_ret | |
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229 address RetData::fixup_ret(int return_bci, MethodData* h_mdo) { |
0 | 230 // First find the mdp which corresponds to the return bci. |
231 address mdp = h_mdo->bci_to_dp(return_bci); | |
232 | |
233 // Now check to see if any of the cache slots are open. | |
234 for (uint row = 0; row < row_limit(); row++) { | |
235 if (bci(row) == no_bci) { | |
236 set_bci_displacement(row, mdp - dp()); | |
237 set_bci_count(row, DataLayout::counter_increment); | |
238 // Barrier to ensure displacement is written before the bci; allows | |
239 // the interpreter to read displacement without fear of race condition. | |
240 release_set_bci(row, return_bci); | |
241 break; | |
242 } | |
243 } | |
244 return mdp; | |
245 } | |
246 | |
247 | |
248 #ifndef PRODUCT | |
249 void RetData::print_data_on(outputStream* st) { | |
250 print_shared(st, "RetData"); | |
251 uint row; | |
252 int entries = 0; | |
253 for (row = 0; row < row_limit(); row++) { | |
254 if (bci(row) != no_bci) entries++; | |
255 } | |
256 st->print_cr("count(%u) entries(%u)", count(), entries); | |
257 for (row = 0; row < row_limit(); row++) { | |
258 if (bci(row) != no_bci) { | |
259 tab(st); | |
260 st->print_cr("bci(%d: count(%u) displacement(%d))", | |
261 bci(row), bci_count(row), bci_displacement(row)); | |
262 } | |
263 } | |
264 } | |
265 #endif // !PRODUCT | |
266 | |
267 // ================================================================== | |
268 // BranchData | |
269 // | |
270 // A BranchData is used to access profiling data for a two-way branch. | |
271 // It consists of taken and not_taken counts as well as a data displacement | |
272 // for the taken case. | |
273 | |
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274 void BranchData::post_initialize(BytecodeStream* stream, MethodData* mdo) { |
0 | 275 assert(stream->bci() == bci(), "wrong pos"); |
276 int target = stream->dest(); | |
277 int my_di = mdo->dp_to_di(dp()); | |
278 int target_di = mdo->bci_to_di(target); | |
279 int offset = target_di - my_di; | |
280 set_displacement(offset); | |
281 } | |
282 | |
283 #ifndef PRODUCT | |
284 void BranchData::print_data_on(outputStream* st) { | |
285 print_shared(st, "BranchData"); | |
286 st->print_cr("taken(%u) displacement(%d)", | |
287 taken(), displacement()); | |
288 tab(st); | |
289 st->print_cr("not taken(%u)", not_taken()); | |
290 } | |
291 #endif | |
292 | |
293 // ================================================================== | |
294 // MultiBranchData | |
295 // | |
296 // A MultiBranchData is used to access profiling information for | |
297 // a multi-way branch (*switch bytecodes). It consists of a series | |
298 // of (count, displacement) pairs, which count the number of times each | |
299 // case was taken and specify the data displacment for each branch target. | |
300 | |
301 int MultiBranchData::compute_cell_count(BytecodeStream* stream) { | |
302 int cell_count = 0; | |
303 if (stream->code() == Bytecodes::_tableswitch) { | |
2142 | 304 Bytecode_tableswitch sw(stream->method()(), stream->bcp()); |
305 cell_count = 1 + per_case_cell_count * (1 + sw.length()); // 1 for default | |
0 | 306 } else { |
2142 | 307 Bytecode_lookupswitch sw(stream->method()(), stream->bcp()); |
308 cell_count = 1 + per_case_cell_count * (sw.number_of_pairs() + 1); // 1 for default | |
0 | 309 } |
310 return cell_count; | |
311 } | |
312 | |
313 void MultiBranchData::post_initialize(BytecodeStream* stream, | |
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314 MethodData* mdo) { |
0 | 315 assert(stream->bci() == bci(), "wrong pos"); |
316 int target; | |
317 int my_di; | |
318 int target_di; | |
319 int offset; | |
320 if (stream->code() == Bytecodes::_tableswitch) { | |
2142 | 321 Bytecode_tableswitch sw(stream->method()(), stream->bcp()); |
322 int len = sw.length(); | |
0 | 323 assert(array_len() == per_case_cell_count * (len + 1), "wrong len"); |
324 for (int count = 0; count < len; count++) { | |
2142 | 325 target = sw.dest_offset_at(count) + bci(); |
0 | 326 my_di = mdo->dp_to_di(dp()); |
327 target_di = mdo->bci_to_di(target); | |
328 offset = target_di - my_di; | |
329 set_displacement_at(count, offset); | |
330 } | |
2142 | 331 target = sw.default_offset() + bci(); |
0 | 332 my_di = mdo->dp_to_di(dp()); |
333 target_di = mdo->bci_to_di(target); | |
334 offset = target_di - my_di; | |
335 set_default_displacement(offset); | |
336 | |
337 } else { | |
2142 | 338 Bytecode_lookupswitch sw(stream->method()(), stream->bcp()); |
339 int npairs = sw.number_of_pairs(); | |
0 | 340 assert(array_len() == per_case_cell_count * (npairs + 1), "wrong len"); |
341 for (int count = 0; count < npairs; count++) { | |
2142 | 342 LookupswitchPair pair = sw.pair_at(count); |
343 target = pair.offset() + bci(); | |
0 | 344 my_di = mdo->dp_to_di(dp()); |
345 target_di = mdo->bci_to_di(target); | |
346 offset = target_di - my_di; | |
347 set_displacement_at(count, offset); | |
348 } | |
2142 | 349 target = sw.default_offset() + bci(); |
0 | 350 my_di = mdo->dp_to_di(dp()); |
351 target_di = mdo->bci_to_di(target); | |
352 offset = target_di - my_di; | |
353 set_default_displacement(offset); | |
354 } | |
355 } | |
356 | |
357 #ifndef PRODUCT | |
358 void MultiBranchData::print_data_on(outputStream* st) { | |
359 print_shared(st, "MultiBranchData"); | |
360 st->print_cr("default_count(%u) displacement(%d)", | |
361 default_count(), default_displacement()); | |
362 int cases = number_of_cases(); | |
363 for (int i = 0; i < cases; i++) { | |
364 tab(st); | |
365 st->print_cr("count(%u) displacement(%d)", | |
366 count_at(i), displacement_at(i)); | |
367 } | |
368 } | |
369 #endif | |
370 | |
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371 #ifndef PRODUCT |
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372 void ArgInfoData::print_data_on(outputStream* st) { |
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373 print_shared(st, "ArgInfoData"); |
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374 int nargs = number_of_args(); |
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375 for (int i = 0; i < nargs; i++) { |
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376 st->print(" 0x%x", arg_modified(i)); |
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377 } |
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378 st->cr(); |
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379 } |
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380 |
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381 #endif |
0 | 382 // ================================================================== |
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383 // MethodData* |
0 | 384 // |
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385 // A MethodData* holds information which has been collected about |
0 | 386 // a method. |
387 | |
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388 MethodData* MethodData::allocate(ClassLoaderData* loader_data, methodHandle method, TRAPS) { |
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389 int size = MethodData::compute_allocation_size_in_words(method); |
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390 |
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391 return new (loader_data, size, false, MetaspaceObj::MethodDataType, THREAD) |
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392 MethodData(method(), size, CHECK_NULL); |
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393 } |
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394 |
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395 int MethodData::bytecode_cell_count(Bytecodes::Code code) { |
8860 | 396 #if defined(COMPILER1) && !defined(COMPILER2) |
397 return no_profile_data; | |
398 #else | |
0 | 399 switch (code) { |
400 case Bytecodes::_checkcast: | |
401 case Bytecodes::_instanceof: | |
402 case Bytecodes::_aastore: | |
403 if (TypeProfileCasts) { | |
404 return ReceiverTypeData::static_cell_count(); | |
405 } else { | |
406 return BitData::static_cell_count(); | |
407 } | |
408 case Bytecodes::_invokespecial: | |
409 case Bytecodes::_invokestatic: | |
410 return CounterData::static_cell_count(); | |
411 case Bytecodes::_goto: | |
412 case Bytecodes::_goto_w: | |
413 case Bytecodes::_jsr: | |
414 case Bytecodes::_jsr_w: | |
415 return JumpData::static_cell_count(); | |
416 case Bytecodes::_invokevirtual: | |
417 case Bytecodes::_invokeinterface: | |
418 return VirtualCallData::static_cell_count(); | |
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419 case Bytecodes::_invokedynamic: |
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420 return CounterData::static_cell_count(); |
0 | 421 case Bytecodes::_ret: |
422 return RetData::static_cell_count(); | |
423 case Bytecodes::_ifeq: | |
424 case Bytecodes::_ifne: | |
425 case Bytecodes::_iflt: | |
426 case Bytecodes::_ifge: | |
427 case Bytecodes::_ifgt: | |
428 case Bytecodes::_ifle: | |
429 case Bytecodes::_if_icmpeq: | |
430 case Bytecodes::_if_icmpne: | |
431 case Bytecodes::_if_icmplt: | |
432 case Bytecodes::_if_icmpge: | |
433 case Bytecodes::_if_icmpgt: | |
434 case Bytecodes::_if_icmple: | |
435 case Bytecodes::_if_acmpeq: | |
436 case Bytecodes::_if_acmpne: | |
437 case Bytecodes::_ifnull: | |
438 case Bytecodes::_ifnonnull: | |
439 return BranchData::static_cell_count(); | |
440 case Bytecodes::_lookupswitch: | |
441 case Bytecodes::_tableswitch: | |
442 return variable_cell_count; | |
443 } | |
444 return no_profile_data; | |
8860 | 445 #endif |
0 | 446 } |
447 | |
448 // Compute the size of the profiling information corresponding to | |
449 // the current bytecode. | |
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450 int MethodData::compute_data_size(BytecodeStream* stream) { |
0 | 451 int cell_count = bytecode_cell_count(stream->code()); |
452 if (cell_count == no_profile_data) { | |
453 return 0; | |
454 } | |
455 if (cell_count == variable_cell_count) { | |
456 cell_count = MultiBranchData::compute_cell_count(stream); | |
457 } | |
458 // Note: cell_count might be zero, meaning that there is just | |
459 // a DataLayout header, with no extra cells. | |
460 assert(cell_count >= 0, "sanity"); | |
461 return DataLayout::compute_size_in_bytes(cell_count); | |
462 } | |
463 | |
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464 int MethodData::compute_extra_data_count(int data_size, int empty_bc_count) { |
0 | 465 if (ProfileTraps) { |
466 // Assume that up to 3% of BCIs with no MDP will need to allocate one. | |
467 int extra_data_count = (uint)(empty_bc_count * 3) / 128 + 1; | |
468 // If the method is large, let the extra BCIs grow numerous (to ~1%). | |
469 int one_percent_of_data | |
470 = (uint)data_size / (DataLayout::header_size_in_bytes()*128); | |
471 if (extra_data_count < one_percent_of_data) | |
472 extra_data_count = one_percent_of_data; | |
473 if (extra_data_count > empty_bc_count) | |
474 extra_data_count = empty_bc_count; // no need for more | |
475 return extra_data_count; | |
476 } else { | |
477 return 0; | |
478 } | |
479 } | |
480 | |
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481 // Compute the size of the MethodData* necessary to store |
0 | 482 // profiling information about a given method. Size is in bytes. |
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483 int MethodData::compute_allocation_size_in_bytes(methodHandle method) { |
0 | 484 int data_size = 0; |
485 BytecodeStream stream(method); | |
486 Bytecodes::Code c; | |
487 int empty_bc_count = 0; // number of bytecodes lacking data | |
488 while ((c = stream.next()) >= 0) { | |
489 int size_in_bytes = compute_data_size(&stream); | |
490 data_size += size_in_bytes; | |
491 if (size_in_bytes == 0) empty_bc_count += 1; | |
492 } | |
493 int object_size = in_bytes(data_offset()) + data_size; | |
494 | |
495 // Add some extra DataLayout cells (at least one) to track stray traps. | |
496 int extra_data_count = compute_extra_data_count(data_size, empty_bc_count); | |
497 object_size += extra_data_count * DataLayout::compute_size_in_bytes(0); | |
498 | |
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499 // Add a cell to record information about modified arguments. |
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500 int arg_size = method->size_of_parameters(); |
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501 object_size += DataLayout::compute_size_in_bytes(arg_size+1); |
0 | 502 return object_size; |
503 } | |
504 | |
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505 // Compute the size of the MethodData* necessary to store |
0 | 506 // profiling information about a given method. Size is in words |
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507 int MethodData::compute_allocation_size_in_words(methodHandle method) { |
0 | 508 int byte_size = compute_allocation_size_in_bytes(method); |
509 int word_size = align_size_up(byte_size, BytesPerWord) / BytesPerWord; | |
510 return align_object_size(word_size); | |
511 } | |
512 | |
513 // Initialize an individual data segment. Returns the size of | |
514 // the segment in bytes. | |
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515 int MethodData::initialize_data(BytecodeStream* stream, |
0 | 516 int data_index) { |
8860 | 517 #if defined(COMPILER1) && !defined(COMPILER2) |
518 return 0; | |
519 #else | |
0 | 520 int cell_count = -1; |
521 int tag = DataLayout::no_tag; | |
522 DataLayout* data_layout = data_layout_at(data_index); | |
523 Bytecodes::Code c = stream->code(); | |
524 switch (c) { | |
525 case Bytecodes::_checkcast: | |
526 case Bytecodes::_instanceof: | |
527 case Bytecodes::_aastore: | |
528 if (TypeProfileCasts) { | |
529 cell_count = ReceiverTypeData::static_cell_count(); | |
530 tag = DataLayout::receiver_type_data_tag; | |
531 } else { | |
532 cell_count = BitData::static_cell_count(); | |
533 tag = DataLayout::bit_data_tag; | |
534 } | |
535 break; | |
536 case Bytecodes::_invokespecial: | |
537 case Bytecodes::_invokestatic: | |
538 cell_count = CounterData::static_cell_count(); | |
539 tag = DataLayout::counter_data_tag; | |
540 break; | |
541 case Bytecodes::_goto: | |
542 case Bytecodes::_goto_w: | |
543 case Bytecodes::_jsr: | |
544 case Bytecodes::_jsr_w: | |
545 cell_count = JumpData::static_cell_count(); | |
546 tag = DataLayout::jump_data_tag; | |
547 break; | |
548 case Bytecodes::_invokevirtual: | |
549 case Bytecodes::_invokeinterface: | |
550 cell_count = VirtualCallData::static_cell_count(); | |
551 tag = DataLayout::virtual_call_data_tag; | |
552 break; | |
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553 case Bytecodes::_invokedynamic: |
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554 // %%% should make a type profile for any invokedynamic that takes a ref argument |
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555 cell_count = CounterData::static_cell_count(); |
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556 tag = DataLayout::counter_data_tag; |
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557 break; |
0 | 558 case Bytecodes::_ret: |
559 cell_count = RetData::static_cell_count(); | |
560 tag = DataLayout::ret_data_tag; | |
561 break; | |
562 case Bytecodes::_ifeq: | |
563 case Bytecodes::_ifne: | |
564 case Bytecodes::_iflt: | |
565 case Bytecodes::_ifge: | |
566 case Bytecodes::_ifgt: | |
567 case Bytecodes::_ifle: | |
568 case Bytecodes::_if_icmpeq: | |
569 case Bytecodes::_if_icmpne: | |
570 case Bytecodes::_if_icmplt: | |
571 case Bytecodes::_if_icmpge: | |
572 case Bytecodes::_if_icmpgt: | |
573 case Bytecodes::_if_icmple: | |
574 case Bytecodes::_if_acmpeq: | |
575 case Bytecodes::_if_acmpne: | |
576 case Bytecodes::_ifnull: | |
577 case Bytecodes::_ifnonnull: | |
578 cell_count = BranchData::static_cell_count(); | |
579 tag = DataLayout::branch_data_tag; | |
580 break; | |
581 case Bytecodes::_lookupswitch: | |
582 case Bytecodes::_tableswitch: | |
583 cell_count = MultiBranchData::compute_cell_count(stream); | |
584 tag = DataLayout::multi_branch_data_tag; | |
585 break; | |
586 } | |
587 assert(tag == DataLayout::multi_branch_data_tag || | |
588 cell_count == bytecode_cell_count(c), "cell counts must agree"); | |
589 if (cell_count >= 0) { | |
590 assert(tag != DataLayout::no_tag, "bad tag"); | |
591 assert(bytecode_has_profile(c), "agree w/ BHP"); | |
592 data_layout->initialize(tag, stream->bci(), cell_count); | |
593 return DataLayout::compute_size_in_bytes(cell_count); | |
594 } else { | |
595 assert(!bytecode_has_profile(c), "agree w/ !BHP"); | |
596 return 0; | |
597 } | |
8860 | 598 #endif |
0 | 599 } |
600 | |
601 // Get the data at an arbitrary (sort of) data index. | |
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602 ProfileData* MethodData::data_at(int data_index) const { |
0 | 603 if (out_of_bounds(data_index)) { |
604 return NULL; | |
605 } | |
606 DataLayout* data_layout = data_layout_at(data_index); | |
941 | 607 return data_layout->data_in(); |
608 } | |
0 | 609 |
941 | 610 ProfileData* DataLayout::data_in() { |
611 switch (tag()) { | |
0 | 612 case DataLayout::no_tag: |
613 default: | |
614 ShouldNotReachHere(); | |
615 return NULL; | |
616 case DataLayout::bit_data_tag: | |
941 | 617 return new BitData(this); |
0 | 618 case DataLayout::counter_data_tag: |
941 | 619 return new CounterData(this); |
0 | 620 case DataLayout::jump_data_tag: |
941 | 621 return new JumpData(this); |
0 | 622 case DataLayout::receiver_type_data_tag: |
941 | 623 return new ReceiverTypeData(this); |
0 | 624 case DataLayout::virtual_call_data_tag: |
941 | 625 return new VirtualCallData(this); |
0 | 626 case DataLayout::ret_data_tag: |
941 | 627 return new RetData(this); |
0 | 628 case DataLayout::branch_data_tag: |
941 | 629 return new BranchData(this); |
0 | 630 case DataLayout::multi_branch_data_tag: |
941 | 631 return new MultiBranchData(this); |
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632 case DataLayout::arg_info_data_tag: |
941 | 633 return new ArgInfoData(this); |
0 | 634 }; |
635 } | |
636 | |
637 // Iteration over data. | |
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638 ProfileData* MethodData::next_data(ProfileData* current) const { |
0 | 639 int current_index = dp_to_di(current->dp()); |
640 int next_index = current_index + current->size_in_bytes(); | |
641 ProfileData* next = data_at(next_index); | |
642 return next; | |
643 } | |
644 | |
645 // Give each of the data entries a chance to perform specific | |
646 // data initialization. | |
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647 void MethodData::post_initialize(BytecodeStream* stream) { |
0 | 648 ResourceMark rm; |
649 ProfileData* data; | |
650 for (data = first_data(); is_valid(data); data = next_data(data)) { | |
651 stream->set_start(data->bci()); | |
652 stream->next(); | |
653 data->post_initialize(stream, this); | |
654 } | |
655 } | |
656 | |
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657 // Initialize the MethodData* corresponding to a given method. |
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658 MethodData::MethodData(methodHandle method, int size, TRAPS) { |
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659 No_Safepoint_Verifier no_safepoint; // init function atomic wrt GC |
0 | 660 ResourceMark rm; |
661 // Set the method back-pointer. | |
662 _method = method(); | |
1783 | 663 |
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664 init(); |
0 | 665 set_creation_mileage(mileage_of(method())); |
666 | |
667 // Go through the bytecodes and allocate and initialize the | |
668 // corresponding data cells. | |
669 int data_size = 0; | |
670 int empty_bc_count = 0; // number of bytecodes lacking data | |
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671 _data[0] = 0; // apparently not set below. |
0 | 672 BytecodeStream stream(method); |
673 Bytecodes::Code c; | |
674 while ((c = stream.next()) >= 0) { | |
675 int size_in_bytes = initialize_data(&stream, data_size); | |
676 data_size += size_in_bytes; | |
677 if (size_in_bytes == 0) empty_bc_count += 1; | |
678 } | |
679 _data_size = data_size; | |
680 int object_size = in_bytes(data_offset()) + data_size; | |
681 | |
682 // Add some extra DataLayout cells (at least one) to track stray traps. | |
683 int extra_data_count = compute_extra_data_count(data_size, empty_bc_count); | |
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684 int extra_size = extra_data_count * DataLayout::compute_size_in_bytes(0); |
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685 |
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686 // Add a cell to record information about modified arguments. |
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687 // Set up _args_modified array after traps cells so that |
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688 // the code for traps cells works. |
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689 DataLayout *dp = data_layout_at(data_size + extra_size); |
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690 |
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691 int arg_size = method->size_of_parameters(); |
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692 dp->initialize(DataLayout::arg_info_data_tag, 0, arg_size+1); |
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693 |
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694 object_size += extra_size + DataLayout::compute_size_in_bytes(arg_size+1); |
0 | 695 |
696 // Set an initial hint. Don't use set_hint_di() because | |
697 // first_di() may be out of bounds if data_size is 0. | |
698 // In that situation, _hint_di is never used, but at | |
699 // least well-defined. | |
700 _hint_di = first_di(); | |
701 | |
702 post_initialize(&stream); | |
703 | |
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704 set_size(object_size); |
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705 } |
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706 |
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707 void MethodData::init() { |
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708 _invocation_counter.init(); |
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709 _backedge_counter.init(); |
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710 _invocation_counter_start = 0; |
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711 _backedge_counter_start = 0; |
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712 _num_loops = 0; |
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713 _num_blocks = 0; |
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714 _highest_comp_level = 0; |
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715 _highest_osr_comp_level = 0; |
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716 _would_profile = true; |
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717 |
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718 // Initialize flags and trap history. |
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719 _nof_decompiles = 0; |
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720 _nof_overflow_recompiles = 0; |
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721 _nof_overflow_traps = 0; |
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722 clear_escape_info(); |
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723 assert(sizeof(_trap_hist) % sizeof(HeapWord) == 0, "align"); |
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724 Copy::zero_to_words((HeapWord*) &_trap_hist, |
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725 sizeof(_trap_hist) / sizeof(HeapWord)); |
0 | 726 } |
727 | |
728 // Get a measure of how much mileage the method has on it. | |
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729 int MethodData::mileage_of(Method* method) { |
0 | 730 int mileage = 0; |
1783 | 731 if (TieredCompilation) { |
732 mileage = MAX2(method->invocation_count(), method->backedge_count()); | |
733 } else { | |
734 int iic = method->interpreter_invocation_count(); | |
735 if (mileage < iic) mileage = iic; | |
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736 MethodCounters* mcs = method->method_counters(); |
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737 if (mcs != NULL) { |
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738 InvocationCounter* ic = mcs->invocation_counter(); |
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739 InvocationCounter* bc = mcs->backedge_counter(); |
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740 int icval = ic->count(); |
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741 if (ic->carry()) icval += CompileThreshold; |
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742 if (mileage < icval) mileage = icval; |
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743 int bcval = bc->count(); |
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744 if (bc->carry()) bcval += CompileThreshold; |
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745 if (mileage < bcval) mileage = bcval; |
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746 } |
1783 | 747 } |
0 | 748 return mileage; |
749 } | |
750 | |
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751 bool MethodData::is_mature() const { |
1783 | 752 return CompilationPolicy::policy()->is_mature(_method); |
0 | 753 } |
754 | |
755 // Translate a bci to its corresponding data index (di). | |
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756 address MethodData::bci_to_dp(int bci) { |
0 | 757 ResourceMark rm; |
758 ProfileData* data = data_before(bci); | |
759 ProfileData* prev = NULL; | |
760 for ( ; is_valid(data); data = next_data(data)) { | |
761 if (data->bci() >= bci) { | |
762 if (data->bci() == bci) set_hint_di(dp_to_di(data->dp())); | |
763 else if (prev != NULL) set_hint_di(dp_to_di(prev->dp())); | |
764 return data->dp(); | |
765 } | |
766 prev = data; | |
767 } | |
768 return (address)limit_data_position(); | |
769 } | |
770 | |
771 // Translate a bci to its corresponding data, or NULL. | |
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772 ProfileData* MethodData::bci_to_data(int bci) { |
0 | 773 ProfileData* data = data_before(bci); |
774 for ( ; is_valid(data); data = next_data(data)) { | |
775 if (data->bci() == bci) { | |
776 set_hint_di(dp_to_di(data->dp())); | |
777 return data; | |
778 } else if (data->bci() > bci) { | |
779 break; | |
780 } | |
781 } | |
782 return bci_to_extra_data(bci, false); | |
783 } | |
784 | |
785 // Translate a bci to its corresponding extra data, or NULL. | |
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786 ProfileData* MethodData::bci_to_extra_data(int bci, bool create_if_missing) { |
0 | 787 DataLayout* dp = extra_data_base(); |
788 DataLayout* end = extra_data_limit(); | |
789 DataLayout* avail = NULL; | |
790 for (; dp < end; dp = next_extra(dp)) { | |
791 // No need for "OrderAccess::load_acquire" ops, | |
792 // since the data structure is monotonic. | |
793 if (dp->tag() == DataLayout::no_tag) break; | |
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794 if (dp->tag() == DataLayout::arg_info_data_tag) { |
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795 dp = end; // ArgInfoData is at the end of extra data section. |
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796 break; |
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797 } |
0 | 798 if (dp->bci() == bci) { |
799 assert(dp->tag() == DataLayout::bit_data_tag, "sane"); | |
800 return new BitData(dp); | |
801 } | |
802 } | |
803 if (create_if_missing && dp < end) { | |
804 // Allocate this one. There is no mutual exclusion, | |
805 // so two threads could allocate different BCIs to the | |
806 // same data layout. This means these extra data | |
807 // records, like most other MDO contents, must not be | |
808 // trusted too much. | |
809 DataLayout temp; | |
810 temp.initialize(DataLayout::bit_data_tag, bci, 0); | |
811 dp->release_set_header(temp.header()); | |
812 assert(dp->tag() == DataLayout::bit_data_tag, "sane"); | |
813 //NO: assert(dp->bci() == bci, "no concurrent allocation"); | |
814 return new BitData(dp); | |
815 } | |
816 return NULL; | |
817 } | |
818 | |
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819 ArgInfoData *MethodData::arg_info() { |
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820 DataLayout* dp = extra_data_base(); |
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821 DataLayout* end = extra_data_limit(); |
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822 for (; dp < end; dp = next_extra(dp)) { |
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823 if (dp->tag() == DataLayout::arg_info_data_tag) |
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824 return new ArgInfoData(dp); |
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825 } |
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826 return NULL; |
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827 } |
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828 |
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829 // Printing |
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830 |
0 | 831 #ifndef PRODUCT |
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832 |
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833 void MethodData::print_on(outputStream* st) const { |
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834 assert(is_methodData(), "should be method data"); |
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835 st->print("method data for "); |
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836 method()->print_value_on(st); |
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837 st->cr(); |
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838 print_data_on(st); |
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839 } |
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840 |
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841 #endif //PRODUCT |
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842 |
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843 void MethodData::print_value_on(outputStream* st) const { |
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844 assert(is_methodData(), "should be method data"); |
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845 st->print("method data for "); |
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846 method()->print_value_on(st); |
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847 } |
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848 |
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849 #ifndef PRODUCT |
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850 void MethodData::print_data_on(outputStream* st) const { |
0 | 851 ResourceMark rm; |
852 ProfileData* data = first_data(); | |
853 for ( ; is_valid(data); data = next_data(data)) { | |
854 st->print("%d", dp_to_di(data->dp())); | |
855 st->fill_to(6); | |
856 data->print_data_on(st); | |
857 } | |
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858 st->print_cr("--- Extra data:"); |
0 | 859 DataLayout* dp = extra_data_base(); |
860 DataLayout* end = extra_data_limit(); | |
861 for (; dp < end; dp = next_extra(dp)) { | |
862 // No need for "OrderAccess::load_acquire" ops, | |
863 // since the data structure is monotonic. | |
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864 if (dp->tag() == DataLayout::no_tag) continue; |
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865 if (dp->tag() == DataLayout::bit_data_tag) { |
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866 data = new BitData(dp); |
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867 } else { |
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868 assert(dp->tag() == DataLayout::arg_info_data_tag, "must be BitData or ArgInfo"); |
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869 data = new ArgInfoData(dp); |
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870 dp = end; // ArgInfoData is at the end of extra data section. |
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871 } |
0 | 872 st->print("%d", dp_to_di(data->dp())); |
873 st->fill_to(6); | |
874 data->print_data_on(st); | |
875 } | |
876 } | |
877 #endif | |
878 | |
7956 | 879 #if INCLUDE_SERVICES |
880 // Size Statistics | |
881 void MethodData::collect_statistics(KlassSizeStats *sz) const { | |
882 int n = sz->count(this); | |
883 sz->_method_data_bytes += n; | |
884 sz->_method_all_bytes += n; | |
885 sz->_rw_bytes += n; | |
886 } | |
887 #endif // INCLUDE_SERVICES | |
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888 |
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889 // Verification |
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890 |
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891 void MethodData::verify_on(outputStream* st) { |
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892 guarantee(is_methodData(), "object must be method data"); |
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893 // guarantee(m->is_perm(), "should be in permspace"); |
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894 this->verify_data_on(st); |
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895 } |
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896 |
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897 void MethodData::verify_data_on(outputStream* st) { |
0 | 898 NEEDS_CLEANUP; |
899 // not yet implemented. | |
900 } |