Mercurial > hg > truffle
annotate src/share/vm/ci/bcEscapeAnalyzer.cpp @ 78:e1e86702e43e
6680665: bytecode Escape Analyzer produces incorrect escape information for methods without oop arguments
Summary: bcEscapeAnalyzer does not analyze methods with no oop arguments.
Reviewed-by: rasbold
author | kvn |
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date | Fri, 28 Mar 2008 11:52:29 -0700 |
parents | 48a3fa21394b |
children | 09c2ba680204 |
rev | line source |
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0 | 1 /* |
2 * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved. | |
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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 | |
26 #include "incls/_precompiled.incl" | |
27 #include "incls/_bcEscapeAnalyzer.cpp.incl" | |
28 | |
29 | |
30 #ifndef PRODUCT | |
31 #define TRACE_BCEA(level, code) \ | |
32 if (EstimateArgEscape && BCEATraceLevel >= level) { \ | |
33 code; \ | |
34 } | |
35 #else | |
36 #define TRACE_BCEA(level, code) | |
37 #endif | |
38 | |
39 // Maintain a map of which aguments a local variable or | |
40 // stack slot may contain. In addition to tracking | |
41 // arguments, it tracks two special values, "allocated" | |
42 // which represents any object allocated in the current | |
43 // method, and "unknown" which is any other object. | |
44 // Up to 30 arguments are handled, with the last one | |
45 // representing summary information for any extra arguments | |
46 class BCEscapeAnalyzer::ArgumentMap { | |
47 uint _bits; | |
48 enum {MAXBIT = 29, | |
49 ALLOCATED = 1, | |
50 UNKNOWN = 2}; | |
51 | |
52 uint int_to_bit(uint e) const { | |
53 if (e > MAXBIT) | |
54 e = MAXBIT; | |
55 return (1 << (e + 2)); | |
56 } | |
57 | |
58 public: | |
59 ArgumentMap() { _bits = 0;} | |
60 void set_bits(uint bits) { _bits = bits;} | |
61 uint get_bits() const { return _bits;} | |
62 void clear() { _bits = 0;} | |
63 void set_all() { _bits = ~0u; } | |
64 bool is_empty() const { return _bits == 0; } | |
65 bool contains(uint var) const { return (_bits & int_to_bit(var)) != 0; } | |
66 bool is_singleton(uint var) const { return (_bits == int_to_bit(var)); } | |
67 bool contains_unknown() const { return (_bits & UNKNOWN) != 0; } | |
68 bool contains_allocated() const { return (_bits & ALLOCATED) != 0; } | |
69 bool contains_vars() const { return (_bits & (((1 << MAXBIT) -1) << 2)) != 0; } | |
70 void set(uint var) { _bits = int_to_bit(var); } | |
71 void add(uint var) { _bits |= int_to_bit(var); } | |
72 void add_unknown() { _bits = UNKNOWN; } | |
73 void add_allocated() { _bits = ALLOCATED; } | |
74 void set_union(const ArgumentMap &am) { _bits |= am._bits; } | |
75 void set_intersect(const ArgumentMap &am) { _bits |= am._bits; } | |
76 void set_difference(const ArgumentMap &am) { _bits &= ~am._bits; } | |
77 void operator=(const ArgumentMap &am) { _bits = am._bits; } | |
78 bool operator==(const ArgumentMap &am) { return _bits == am._bits; } | |
79 bool operator!=(const ArgumentMap &am) { return _bits != am._bits; } | |
80 }; | |
81 | |
82 class BCEscapeAnalyzer::StateInfo { | |
83 public: | |
84 ArgumentMap *_vars; | |
85 ArgumentMap *_stack; | |
86 short _stack_height; | |
87 short _max_stack; | |
88 bool _initialized; | |
89 ArgumentMap empty_map; | |
90 | |
91 StateInfo() { | |
92 empty_map.clear(); | |
93 } | |
94 | |
95 ArgumentMap raw_pop() { assert(_stack_height > 0, "stack underflow"); return _stack[--_stack_height]; } | |
96 ArgumentMap apop() { return raw_pop(); } | |
97 void spop() { raw_pop(); } | |
98 void lpop() { spop(); spop(); } | |
99 void raw_push(ArgumentMap i) { assert(_stack_height < _max_stack, "stack overflow"); _stack[_stack_height++] = i; } | |
100 void apush(ArgumentMap i) { raw_push(i); } | |
101 void spush() { raw_push(empty_map); } | |
102 void lpush() { spush(); spush(); } | |
103 | |
104 }; | |
105 | |
106 void BCEscapeAnalyzer::set_returned(ArgumentMap vars) { | |
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107 for (int i = 0; i < _arg_size; i++) { |
0 | 108 if (vars.contains(i)) |
109 _arg_returned.set_bit(i); | |
110 } | |
111 _return_local = _return_local && !(vars.contains_unknown() || vars.contains_allocated()); | |
112 _return_allocated = _return_allocated && vars.contains_allocated() && !(vars.contains_unknown() || vars.contains_vars()); | |
113 } | |
114 | |
115 // return true if any element of vars is an argument | |
116 bool BCEscapeAnalyzer::is_argument(ArgumentMap vars) { | |
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117 for (int i = 0; i < _arg_size; i++) { |
0 | 118 if (vars.contains(i)) |
119 return true; | |
120 } | |
121 return false; | |
122 } | |
123 | |
124 // return true if any element of vars is an arg_stack argument | |
125 bool BCEscapeAnalyzer::is_arg_stack(ArgumentMap vars){ | |
126 if (_conservative) | |
127 return true; | |
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128 for (int i = 0; i < _arg_size; i++) { |
0 | 129 if (vars.contains(i) && _arg_stack.at(i)) |
130 return true; | |
131 } | |
132 return false; | |
133 } | |
134 | |
135 void BCEscapeAnalyzer::clear_bits(ArgumentMap vars, BitMap &bm) { | |
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136 for (int i = 0; i < _arg_size; i++) { |
0 | 137 if (vars.contains(i)) { |
138 bm.clear_bit(i); | |
139 } | |
140 } | |
141 } | |
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142 |
0 | 143 void BCEscapeAnalyzer::set_method_escape(ArgumentMap vars) { |
144 clear_bits(vars, _arg_local); | |
145 } | |
146 | |
147 void BCEscapeAnalyzer::set_global_escape(ArgumentMap vars) { | |
148 clear_bits(vars, _arg_local); | |
149 clear_bits(vars, _arg_stack); | |
150 if (vars.contains_allocated()) | |
151 _allocated_escapes = true; | |
152 } | |
153 | |
154 void BCEscapeAnalyzer::set_dirty(ArgumentMap vars) { | |
155 clear_bits(vars, _dirty); | |
156 } | |
157 | |
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158 void BCEscapeAnalyzer::set_modified(ArgumentMap vars, int offs, int size) { |
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159 |
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160 for (int i = 0; i < _arg_size; i++) { |
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161 if (vars.contains(i)) { |
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162 set_arg_modified(i, offs, size); |
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163 } |
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164 } |
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165 if (vars.contains_unknown()) |
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166 _unknown_modified = true; |
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167 } |
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168 |
0 | 169 bool BCEscapeAnalyzer::is_recursive_call(ciMethod* callee) { |
170 for (BCEscapeAnalyzer* scope = this; scope != NULL; scope = scope->_parent) { | |
171 if (scope->method() == callee) { | |
172 return true; | |
173 } | |
174 } | |
175 return false; | |
176 } | |
177 | |
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178 bool BCEscapeAnalyzer::is_arg_modified(int arg, int offset, int size_in_bytes) { |
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179 if (offset == OFFSET_ANY) |
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180 return _arg_modified[arg] != 0; |
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181 assert(arg >= 0 && arg < _arg_size, "must be an argument."); |
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182 bool modified = false; |
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183 int l = offset / HeapWordSize; |
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184 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; |
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185 if (l > ARG_OFFSET_MAX) |
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186 l = ARG_OFFSET_MAX; |
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187 if (h > ARG_OFFSET_MAX+1) |
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188 h = ARG_OFFSET_MAX + 1; |
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189 for (int i = l; i < h; i++) { |
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190 modified = modified || (_arg_modified[arg] & (1 << i)) != 0; |
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191 } |
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192 return modified; |
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193 } |
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194 |
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195 void BCEscapeAnalyzer::set_arg_modified(int arg, int offset, int size_in_bytes) { |
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196 if (offset == OFFSET_ANY) { |
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197 _arg_modified[arg] = (uint) -1; |
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198 return; |
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199 } |
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200 assert(arg >= 0 && arg < _arg_size, "must be an argument."); |
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201 int l = offset / HeapWordSize; |
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202 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; |
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203 if (l > ARG_OFFSET_MAX) |
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204 l = ARG_OFFSET_MAX; |
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205 if (h > ARG_OFFSET_MAX+1) |
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206 h = ARG_OFFSET_MAX + 1; |
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207 for (int i = l; i < h; i++) { |
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208 _arg_modified[arg] |= (1 << i); |
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209 } |
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210 } |
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211 |
0 | 212 void BCEscapeAnalyzer::invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder) { |
213 int i; | |
214 | |
215 // retrieve information about the callee | |
216 ciInstanceKlass* klass = target->holder(); | |
217 ciInstanceKlass* calling_klass = method()->holder(); | |
218 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder); | |
219 ciInstanceKlass* actual_recv = callee_holder; | |
220 | |
221 // compute size of arguments | |
222 int arg_size = target->arg_size(); | |
223 if (!target->is_loaded() && code == Bytecodes::_invokestatic) { | |
224 arg_size--; | |
225 } | |
226 int arg_base = MAX2(state._stack_height - arg_size, 0); | |
227 | |
228 // direct recursive calls are skipped if they can be bound statically without introducing | |
229 // dependencies and if parameters are passed at the same position as in the current method | |
230 // other calls are skipped if there are no unescaped arguments passed to them | |
231 bool directly_recursive = (method() == target) && | |
232 (code != Bytecodes::_invokevirtual || target->is_final_method() || state._stack[arg_base] .is_empty()); | |
233 | |
234 // check if analysis of callee can safely be skipped | |
235 bool skip_callee = true; | |
236 for (i = state._stack_height - 1; i >= arg_base && skip_callee; i--) { | |
237 ArgumentMap arg = state._stack[i]; | |
238 skip_callee = !is_argument(arg) || !is_arg_stack(arg) || (directly_recursive && arg.is_singleton(i - arg_base)); | |
239 } | |
240 if (skip_callee) { | |
241 TRACE_BCEA(3, tty->print_cr("[EA] skipping method %s::%s", holder->name()->as_utf8(), target->name()->as_utf8())); | |
242 for (i = 0; i < arg_size; i++) { | |
243 set_method_escape(state.raw_pop()); | |
244 } | |
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245 _unknown_modified = true; // assume the worst since we don't analyze the called method |
0 | 246 return; |
247 } | |
248 | |
249 // determine actual method (use CHA if necessary) | |
250 ciMethod* inline_target = NULL; | |
251 if (target->is_loaded() && klass->is_loaded() | |
252 && (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized()) | |
253 && target->will_link(klass, callee_holder, code)) { | |
254 if (code == Bytecodes::_invokestatic | |
255 || code == Bytecodes::_invokespecial | |
256 || code == Bytecodes::_invokevirtual && target->is_final_method()) { | |
257 inline_target = target; | |
258 } else { | |
259 inline_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv); | |
260 } | |
261 } | |
262 | |
263 if (inline_target != NULL && !is_recursive_call(inline_target)) { | |
264 // analyze callee | |
265 BCEscapeAnalyzer analyzer(inline_target, this); | |
266 | |
267 // adjust escape state of actual parameters | |
268 bool must_record_dependencies = false; | |
269 for (i = arg_size - 1; i >= 0; i--) { | |
270 ArgumentMap arg = state.raw_pop(); | |
271 if (!is_argument(arg)) | |
272 continue; | |
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273 for (int j = 0; j < _arg_size; j++) { |
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274 if (arg.contains(j)) { |
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275 _arg_modified[j] |= analyzer._arg_modified[i]; |
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276 } |
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277 } |
0 | 278 if (!is_arg_stack(arg)) { |
279 // arguments have already been recognized as escaping | |
280 } else if (analyzer.is_arg_stack(i) && !analyzer.is_arg_returned(i)) { | |
281 set_method_escape(arg); | |
282 must_record_dependencies = true; | |
283 } else { | |
284 set_global_escape(arg); | |
285 } | |
286 } | |
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287 _unknown_modified = _unknown_modified || analyzer.has_non_arg_side_affects(); |
0 | 288 |
289 // record dependencies if at least one parameter retained stack-allocatable | |
290 if (must_record_dependencies) { | |
291 if (code == Bytecodes::_invokeinterface || code == Bytecodes::_invokevirtual && !target->is_final_method()) { | |
292 _dependencies.append(actual_recv); | |
293 _dependencies.append(inline_target); | |
294 } | |
295 _dependencies.appendAll(analyzer.dependencies()); | |
296 } | |
297 } else { | |
298 TRACE_BCEA(1, tty->print_cr("[EA] virtual method %s is not monomorphic.", | |
299 target->name()->as_utf8())); | |
300 // conservatively mark all actual parameters as escaping globally | |
301 for (i = 0; i < arg_size; i++) { | |
302 ArgumentMap arg = state.raw_pop(); | |
303 if (!is_argument(arg)) | |
304 continue; | |
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305 set_modified(arg, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
0 | 306 set_global_escape(arg); |
307 } | |
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308 _unknown_modified = true; // assume the worst since we don't know the called method |
0 | 309 } |
310 } | |
311 | |
312 bool BCEscapeAnalyzer::contains(uint arg_set1, uint arg_set2) { | |
313 return ((~arg_set1) | arg_set2) == 0; | |
314 } | |
315 | |
316 | |
317 void BCEscapeAnalyzer::iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors) { | |
318 | |
319 blk->set_processed(); | |
320 ciBytecodeStream s(method()); | |
321 int limit_bci = blk->limit_bci(); | |
322 bool fall_through = false; | |
323 ArgumentMap allocated_obj; | |
324 allocated_obj.add_allocated(); | |
325 ArgumentMap unknown_obj; | |
326 unknown_obj.add_unknown(); | |
327 ArgumentMap empty_map; | |
328 | |
329 s.reset_to_bci(blk->start_bci()); | |
330 while (s.next() != ciBytecodeStream::EOBC() && s.cur_bci() < limit_bci) { | |
331 fall_through = true; | |
332 switch (s.cur_bc()) { | |
333 case Bytecodes::_nop: | |
334 break; | |
335 case Bytecodes::_aconst_null: | |
336 state.apush(empty_map); | |
337 break; | |
338 case Bytecodes::_iconst_m1: | |
339 case Bytecodes::_iconst_0: | |
340 case Bytecodes::_iconst_1: | |
341 case Bytecodes::_iconst_2: | |
342 case Bytecodes::_iconst_3: | |
343 case Bytecodes::_iconst_4: | |
344 case Bytecodes::_iconst_5: | |
345 case Bytecodes::_fconst_0: | |
346 case Bytecodes::_fconst_1: | |
347 case Bytecodes::_fconst_2: | |
348 case Bytecodes::_bipush: | |
349 case Bytecodes::_sipush: | |
350 state.spush(); | |
351 break; | |
352 case Bytecodes::_lconst_0: | |
353 case Bytecodes::_lconst_1: | |
354 case Bytecodes::_dconst_0: | |
355 case Bytecodes::_dconst_1: | |
356 state.lpush(); | |
357 break; | |
358 case Bytecodes::_ldc: | |
359 case Bytecodes::_ldc_w: | |
360 case Bytecodes::_ldc2_w: | |
361 if (type2size[s.get_constant().basic_type()] == 1) { | |
362 state.spush(); | |
363 } else { | |
364 state.lpush(); | |
365 } | |
366 break; | |
367 case Bytecodes::_aload: | |
368 state.apush(state._vars[s.get_index()]); | |
369 break; | |
370 case Bytecodes::_iload: | |
371 case Bytecodes::_fload: | |
372 case Bytecodes::_iload_0: | |
373 case Bytecodes::_iload_1: | |
374 case Bytecodes::_iload_2: | |
375 case Bytecodes::_iload_3: | |
376 case Bytecodes::_fload_0: | |
377 case Bytecodes::_fload_1: | |
378 case Bytecodes::_fload_2: | |
379 case Bytecodes::_fload_3: | |
380 state.spush(); | |
381 break; | |
382 case Bytecodes::_lload: | |
383 case Bytecodes::_dload: | |
384 case Bytecodes::_lload_0: | |
385 case Bytecodes::_lload_1: | |
386 case Bytecodes::_lload_2: | |
387 case Bytecodes::_lload_3: | |
388 case Bytecodes::_dload_0: | |
389 case Bytecodes::_dload_1: | |
390 case Bytecodes::_dload_2: | |
391 case Bytecodes::_dload_3: | |
392 state.lpush(); | |
393 break; | |
394 case Bytecodes::_aload_0: | |
395 state.apush(state._vars[0]); | |
396 break; | |
397 case Bytecodes::_aload_1: | |
398 state.apush(state._vars[1]); | |
399 break; | |
400 case Bytecodes::_aload_2: | |
401 state.apush(state._vars[2]); | |
402 break; | |
403 case Bytecodes::_aload_3: | |
404 state.apush(state._vars[3]); | |
405 break; | |
406 case Bytecodes::_iaload: | |
407 case Bytecodes::_faload: | |
408 case Bytecodes::_baload: | |
409 case Bytecodes::_caload: | |
410 case Bytecodes::_saload: | |
411 state.spop(); | |
412 set_method_escape(state.apop()); | |
413 state.spush(); | |
414 break; | |
415 case Bytecodes::_laload: | |
416 case Bytecodes::_daload: | |
417 state.spop(); | |
418 set_method_escape(state.apop()); | |
419 state.lpush(); | |
420 break; | |
421 case Bytecodes::_aaload: | |
422 { state.spop(); | |
423 ArgumentMap array = state.apop(); | |
424 set_method_escape(array); | |
425 state.apush(unknown_obj); | |
426 set_dirty(array); | |
427 } | |
428 break; | |
429 case Bytecodes::_istore: | |
430 case Bytecodes::_fstore: | |
431 case Bytecodes::_istore_0: | |
432 case Bytecodes::_istore_1: | |
433 case Bytecodes::_istore_2: | |
434 case Bytecodes::_istore_3: | |
435 case Bytecodes::_fstore_0: | |
436 case Bytecodes::_fstore_1: | |
437 case Bytecodes::_fstore_2: | |
438 case Bytecodes::_fstore_3: | |
439 state.spop(); | |
440 break; | |
441 case Bytecodes::_lstore: | |
442 case Bytecodes::_dstore: | |
443 case Bytecodes::_lstore_0: | |
444 case Bytecodes::_lstore_1: | |
445 case Bytecodes::_lstore_2: | |
446 case Bytecodes::_lstore_3: | |
447 case Bytecodes::_dstore_0: | |
448 case Bytecodes::_dstore_1: | |
449 case Bytecodes::_dstore_2: | |
450 case Bytecodes::_dstore_3: | |
451 state.lpop(); | |
452 break; | |
453 case Bytecodes::_astore: | |
454 state._vars[s.get_index()] = state.apop(); | |
455 break; | |
456 case Bytecodes::_astore_0: | |
457 state._vars[0] = state.apop(); | |
458 break; | |
459 case Bytecodes::_astore_1: | |
460 state._vars[1] = state.apop(); | |
461 break; | |
462 case Bytecodes::_astore_2: | |
463 state._vars[2] = state.apop(); | |
464 break; | |
465 case Bytecodes::_astore_3: | |
466 state._vars[3] = state.apop(); | |
467 break; | |
468 case Bytecodes::_iastore: | |
469 case Bytecodes::_fastore: | |
470 case Bytecodes::_bastore: | |
471 case Bytecodes::_castore: | |
472 case Bytecodes::_sastore: | |
473 { | |
474 state.spop(); | |
475 state.spop(); | |
476 ArgumentMap arr = state.apop(); | |
477 set_method_escape(arr); | |
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478 set_modified(arr, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
0 | 479 break; |
480 } | |
481 case Bytecodes::_lastore: | |
482 case Bytecodes::_dastore: | |
483 { | |
484 state.lpop(); | |
485 state.spop(); | |
486 ArgumentMap arr = state.apop(); | |
487 set_method_escape(arr); | |
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488 set_modified(arr, OFFSET_ANY, type2size[T_LONG]*HeapWordSize); |
0 | 489 break; |
490 } | |
491 case Bytecodes::_aastore: | |
492 { | |
493 set_global_escape(state.apop()); | |
494 state.spop(); | |
495 ArgumentMap arr = state.apop(); | |
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496 set_modified(arr, OFFSET_ANY, type2size[T_OBJECT]*HeapWordSize); |
0 | 497 break; |
498 } | |
499 case Bytecodes::_pop: | |
500 state.raw_pop(); | |
501 break; | |
502 case Bytecodes::_pop2: | |
503 state.raw_pop(); | |
504 state.raw_pop(); | |
505 break; | |
506 case Bytecodes::_dup: | |
507 { ArgumentMap w1 = state.raw_pop(); | |
508 state.raw_push(w1); | |
509 state.raw_push(w1); | |
510 } | |
511 break; | |
512 case Bytecodes::_dup_x1: | |
513 { ArgumentMap w1 = state.raw_pop(); | |
514 ArgumentMap w2 = state.raw_pop(); | |
515 state.raw_push(w1); | |
516 state.raw_push(w2); | |
517 state.raw_push(w1); | |
518 } | |
519 break; | |
520 case Bytecodes::_dup_x2: | |
521 { ArgumentMap w1 = state.raw_pop(); | |
522 ArgumentMap w2 = state.raw_pop(); | |
523 ArgumentMap w3 = state.raw_pop(); | |
524 state.raw_push(w1); | |
525 state.raw_push(w3); | |
526 state.raw_push(w2); | |
527 state.raw_push(w1); | |
528 } | |
529 break; | |
530 case Bytecodes::_dup2: | |
531 { ArgumentMap w1 = state.raw_pop(); | |
532 ArgumentMap w2 = state.raw_pop(); | |
533 state.raw_push(w2); | |
534 state.raw_push(w1); | |
535 state.raw_push(w2); | |
536 state.raw_push(w1); | |
537 } | |
538 break; | |
539 case Bytecodes::_dup2_x1: | |
540 { ArgumentMap w1 = state.raw_pop(); | |
541 ArgumentMap w2 = state.raw_pop(); | |
542 ArgumentMap w3 = state.raw_pop(); | |
543 state.raw_push(w2); | |
544 state.raw_push(w1); | |
545 state.raw_push(w3); | |
546 state.raw_push(w2); | |
547 state.raw_push(w1); | |
548 } | |
549 break; | |
550 case Bytecodes::_dup2_x2: | |
551 { ArgumentMap w1 = state.raw_pop(); | |
552 ArgumentMap w2 = state.raw_pop(); | |
553 ArgumentMap w3 = state.raw_pop(); | |
554 ArgumentMap w4 = state.raw_pop(); | |
555 state.raw_push(w2); | |
556 state.raw_push(w1); | |
557 state.raw_push(w4); | |
558 state.raw_push(w3); | |
559 state.raw_push(w2); | |
560 state.raw_push(w1); | |
561 } | |
562 break; | |
563 case Bytecodes::_swap: | |
564 { ArgumentMap w1 = state.raw_pop(); | |
565 ArgumentMap w2 = state.raw_pop(); | |
566 state.raw_push(w1); | |
567 state.raw_push(w2); | |
568 } | |
569 break; | |
570 case Bytecodes::_iadd: | |
571 case Bytecodes::_fadd: | |
572 case Bytecodes::_isub: | |
573 case Bytecodes::_fsub: | |
574 case Bytecodes::_imul: | |
575 case Bytecodes::_fmul: | |
576 case Bytecodes::_idiv: | |
577 case Bytecodes::_fdiv: | |
578 case Bytecodes::_irem: | |
579 case Bytecodes::_frem: | |
580 case Bytecodes::_iand: | |
581 case Bytecodes::_ior: | |
582 case Bytecodes::_ixor: | |
583 state.spop(); | |
584 state.spop(); | |
585 state.spush(); | |
586 break; | |
587 case Bytecodes::_ladd: | |
588 case Bytecodes::_dadd: | |
589 case Bytecodes::_lsub: | |
590 case Bytecodes::_dsub: | |
591 case Bytecodes::_lmul: | |
592 case Bytecodes::_dmul: | |
593 case Bytecodes::_ldiv: | |
594 case Bytecodes::_ddiv: | |
595 case Bytecodes::_lrem: | |
596 case Bytecodes::_drem: | |
597 case Bytecodes::_land: | |
598 case Bytecodes::_lor: | |
599 case Bytecodes::_lxor: | |
600 state.lpop(); | |
601 state.lpop(); | |
602 state.lpush(); | |
603 break; | |
604 case Bytecodes::_ishl: | |
605 case Bytecodes::_ishr: | |
606 case Bytecodes::_iushr: | |
607 state.spop(); | |
608 state.spop(); | |
609 state.spush(); | |
610 break; | |
611 case Bytecodes::_lshl: | |
612 case Bytecodes::_lshr: | |
613 case Bytecodes::_lushr: | |
614 state.spop(); | |
615 state.lpop(); | |
616 state.lpush(); | |
617 break; | |
618 case Bytecodes::_ineg: | |
619 case Bytecodes::_fneg: | |
620 state.spop(); | |
621 state.spush(); | |
622 break; | |
623 case Bytecodes::_lneg: | |
624 case Bytecodes::_dneg: | |
625 state.lpop(); | |
626 state.lpush(); | |
627 break; | |
628 case Bytecodes::_iinc: | |
629 break; | |
630 case Bytecodes::_i2l: | |
631 case Bytecodes::_i2d: | |
632 case Bytecodes::_f2l: | |
633 case Bytecodes::_f2d: | |
634 state.spop(); | |
635 state.lpush(); | |
636 break; | |
637 case Bytecodes::_i2f: | |
638 case Bytecodes::_f2i: | |
639 state.spop(); | |
640 state.spush(); | |
641 break; | |
642 case Bytecodes::_l2i: | |
643 case Bytecodes::_l2f: | |
644 case Bytecodes::_d2i: | |
645 case Bytecodes::_d2f: | |
646 state.lpop(); | |
647 state.spush(); | |
648 break; | |
649 case Bytecodes::_l2d: | |
650 case Bytecodes::_d2l: | |
651 state.lpop(); | |
652 state.lpush(); | |
653 break; | |
654 case Bytecodes::_i2b: | |
655 case Bytecodes::_i2c: | |
656 case Bytecodes::_i2s: | |
657 state.spop(); | |
658 state.spush(); | |
659 break; | |
660 case Bytecodes::_lcmp: | |
661 case Bytecodes::_dcmpl: | |
662 case Bytecodes::_dcmpg: | |
663 state.lpop(); | |
664 state.lpop(); | |
665 state.spush(); | |
666 break; | |
667 case Bytecodes::_fcmpl: | |
668 case Bytecodes::_fcmpg: | |
669 state.spop(); | |
670 state.spop(); | |
671 state.spush(); | |
672 break; | |
673 case Bytecodes::_ifeq: | |
674 case Bytecodes::_ifne: | |
675 case Bytecodes::_iflt: | |
676 case Bytecodes::_ifge: | |
677 case Bytecodes::_ifgt: | |
678 case Bytecodes::_ifle: | |
679 { | |
680 state.spop(); | |
681 int dest_bci = s.get_dest(); | |
682 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
683 assert(s.next_bci() == limit_bci, "branch must end block"); | |
684 successors.push(_methodBlocks->block_containing(dest_bci)); | |
685 break; | |
686 } | |
687 case Bytecodes::_if_icmpeq: | |
688 case Bytecodes::_if_icmpne: | |
689 case Bytecodes::_if_icmplt: | |
690 case Bytecodes::_if_icmpge: | |
691 case Bytecodes::_if_icmpgt: | |
692 case Bytecodes::_if_icmple: | |
693 { | |
694 state.spop(); | |
695 state.spop(); | |
696 int dest_bci = s.get_dest(); | |
697 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
698 assert(s.next_bci() == limit_bci, "branch must end block"); | |
699 successors.push(_methodBlocks->block_containing(dest_bci)); | |
700 break; | |
701 } | |
702 case Bytecodes::_if_acmpeq: | |
703 case Bytecodes::_if_acmpne: | |
704 { | |
705 set_method_escape(state.apop()); | |
706 set_method_escape(state.apop()); | |
707 int dest_bci = s.get_dest(); | |
708 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
709 assert(s.next_bci() == limit_bci, "branch must end block"); | |
710 successors.push(_methodBlocks->block_containing(dest_bci)); | |
711 break; | |
712 } | |
713 case Bytecodes::_goto: | |
714 { | |
715 int dest_bci = s.get_dest(); | |
716 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
717 assert(s.next_bci() == limit_bci, "branch must end block"); | |
718 successors.push(_methodBlocks->block_containing(dest_bci)); | |
719 fall_through = false; | |
720 break; | |
721 } | |
722 case Bytecodes::_jsr: | |
723 { | |
724 int dest_bci = s.get_dest(); | |
725 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
726 assert(s.next_bci() == limit_bci, "branch must end block"); | |
727 state.apush(empty_map); | |
728 successors.push(_methodBlocks->block_containing(dest_bci)); | |
729 fall_through = false; | |
730 break; | |
731 } | |
732 case Bytecodes::_ret: | |
733 // we don't track the destination of a "ret" instruction | |
734 assert(s.next_bci() == limit_bci, "branch must end block"); | |
735 fall_through = false; | |
736 break; | |
737 case Bytecodes::_return: | |
738 assert(s.next_bci() == limit_bci, "return must end block"); | |
739 fall_through = false; | |
740 break; | |
741 case Bytecodes::_tableswitch: | |
742 { | |
743 state.spop(); | |
744 Bytecode_tableswitch* switch_ = Bytecode_tableswitch_at(s.cur_bcp()); | |
745 int len = switch_->length(); | |
746 int dest_bci; | |
747 for (int i = 0; i < len; i++) { | |
748 dest_bci = s.cur_bci() + switch_->dest_offset_at(i); | |
749 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
750 successors.push(_methodBlocks->block_containing(dest_bci)); | |
751 } | |
752 dest_bci = s.cur_bci() + switch_->default_offset(); | |
753 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
754 successors.push(_methodBlocks->block_containing(dest_bci)); | |
755 assert(s.next_bci() == limit_bci, "branch must end block"); | |
756 fall_through = false; | |
757 break; | |
758 } | |
759 case Bytecodes::_lookupswitch: | |
760 { | |
761 state.spop(); | |
762 Bytecode_lookupswitch* switch_ = Bytecode_lookupswitch_at(s.cur_bcp()); | |
763 int len = switch_->number_of_pairs(); | |
764 int dest_bci; | |
765 for (int i = 0; i < len; i++) { | |
766 dest_bci = s.cur_bci() + switch_->pair_at(i)->offset(); | |
767 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
768 successors.push(_methodBlocks->block_containing(dest_bci)); | |
769 } | |
770 dest_bci = s.cur_bci() + switch_->default_offset(); | |
771 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
772 successors.push(_methodBlocks->block_containing(dest_bci)); | |
773 fall_through = false; | |
774 break; | |
775 } | |
776 case Bytecodes::_ireturn: | |
777 case Bytecodes::_freturn: | |
778 state.spop(); | |
779 fall_through = false; | |
780 break; | |
781 case Bytecodes::_lreturn: | |
782 case Bytecodes::_dreturn: | |
783 state.lpop(); | |
784 fall_through = false; | |
785 break; | |
786 case Bytecodes::_areturn: | |
787 set_returned(state.apop()); | |
788 fall_through = false; | |
789 break; | |
790 case Bytecodes::_getstatic: | |
791 case Bytecodes::_getfield: | |
792 { bool will_link; | |
793 ciField* field = s.get_field(will_link); | |
794 BasicType field_type = field->type()->basic_type(); | |
795 if (s.cur_bc() != Bytecodes::_getstatic) { | |
796 set_method_escape(state.apop()); | |
797 } | |
798 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
799 state.apush(unknown_obj); | |
800 } else if (type2size[field_type] == 1) { | |
801 state.spush(); | |
802 } else { | |
803 state.lpush(); | |
804 } | |
805 } | |
806 break; | |
807 case Bytecodes::_putstatic: | |
808 case Bytecodes::_putfield: | |
809 { bool will_link; | |
810 ciField* field = s.get_field(will_link); | |
811 BasicType field_type = field->type()->basic_type(); | |
812 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
813 set_global_escape(state.apop()); | |
814 } else if (type2size[field_type] == 1) { | |
815 state.spop(); | |
816 } else { | |
817 state.lpop(); | |
818 } | |
819 if (s.cur_bc() != Bytecodes::_putstatic) { | |
820 ArgumentMap p = state.apop(); | |
821 set_method_escape(p); | |
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822 set_modified(p, will_link ? field->offset() : OFFSET_ANY, type2size[field_type]*HeapWordSize); |
0 | 823 } |
824 } | |
825 break; | |
826 case Bytecodes::_invokevirtual: | |
827 case Bytecodes::_invokespecial: | |
828 case Bytecodes::_invokestatic: | |
829 case Bytecodes::_invokeinterface: | |
830 { bool will_link; | |
831 ciMethod* target = s.get_method(will_link); | |
832 ciKlass* holder = s.get_declared_method_holder(); | |
833 invoke(state, s.cur_bc(), target, holder); | |
834 ciType* return_type = target->return_type(); | |
835 if (!return_type->is_primitive_type()) { | |
836 state.apush(unknown_obj); | |
837 } else if (return_type->is_one_word()) { | |
838 state.spush(); | |
839 } else if (return_type->is_two_word()) { | |
840 state.lpush(); | |
841 } | |
842 } | |
843 break; | |
844 case Bytecodes::_xxxunusedxxx: | |
845 ShouldNotReachHere(); | |
846 break; | |
847 case Bytecodes::_new: | |
848 state.apush(allocated_obj); | |
849 break; | |
850 case Bytecodes::_newarray: | |
851 case Bytecodes::_anewarray: | |
852 state.spop(); | |
853 state.apush(allocated_obj); | |
854 break; | |
855 case Bytecodes::_multianewarray: | |
856 { int i = s.cur_bcp()[3]; | |
857 while (i-- > 0) state.spop(); | |
858 state.apush(allocated_obj); | |
859 } | |
860 break; | |
861 case Bytecodes::_arraylength: | |
862 set_method_escape(state.apop()); | |
863 state.spush(); | |
864 break; | |
865 case Bytecodes::_athrow: | |
866 set_global_escape(state.apop()); | |
867 fall_through = false; | |
868 break; | |
869 case Bytecodes::_checkcast: | |
870 { ArgumentMap obj = state.apop(); | |
871 set_method_escape(obj); | |
872 state.apush(obj); | |
873 } | |
874 break; | |
875 case Bytecodes::_instanceof: | |
876 set_method_escape(state.apop()); | |
877 state.spush(); | |
878 break; | |
879 case Bytecodes::_monitorenter: | |
880 case Bytecodes::_monitorexit: | |
881 state.apop(); | |
882 break; | |
883 case Bytecodes::_wide: | |
884 ShouldNotReachHere(); | |
885 break; | |
886 case Bytecodes::_ifnull: | |
887 case Bytecodes::_ifnonnull: | |
888 { | |
889 set_method_escape(state.apop()); | |
890 int dest_bci = s.get_dest(); | |
891 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
892 assert(s.next_bci() == limit_bci, "branch must end block"); | |
893 successors.push(_methodBlocks->block_containing(dest_bci)); | |
894 break; | |
895 } | |
896 case Bytecodes::_goto_w: | |
897 { | |
898 int dest_bci = s.get_far_dest(); | |
899 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
900 assert(s.next_bci() == limit_bci, "branch must end block"); | |
901 successors.push(_methodBlocks->block_containing(dest_bci)); | |
902 fall_through = false; | |
903 break; | |
904 } | |
905 case Bytecodes::_jsr_w: | |
906 { | |
907 int dest_bci = s.get_far_dest(); | |
908 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
909 assert(s.next_bci() == limit_bci, "branch must end block"); | |
910 state.apush(empty_map); | |
911 successors.push(_methodBlocks->block_containing(dest_bci)); | |
912 fall_through = false; | |
913 break; | |
914 } | |
915 case Bytecodes::_breakpoint: | |
916 break; | |
917 default: | |
918 ShouldNotReachHere(); | |
919 break; | |
920 } | |
921 | |
922 } | |
923 if (fall_through) { | |
924 int fall_through_bci = s.cur_bci(); | |
925 if (fall_through_bci < _method->code_size()) { | |
926 assert(_methodBlocks->is_block_start(fall_through_bci), "must fall through to block start."); | |
927 successors.push(_methodBlocks->block_containing(fall_through_bci)); | |
928 } | |
929 } | |
930 } | |
931 | |
932 void BCEscapeAnalyzer::merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state) { | |
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933 StateInfo *d_state = blockstates + dest->index(); |
0 | 934 int nlocals = _method->max_locals(); |
935 | |
936 // exceptions may cause transfer of control to handlers in the middle of a | |
937 // block, so we don't merge the incoming state of exception handlers | |
938 if (dest->is_handler()) | |
939 return; | |
940 if (!d_state->_initialized ) { | |
941 // destination not initialized, just copy | |
942 for (int i = 0; i < nlocals; i++) { | |
943 d_state->_vars[i] = s_state->_vars[i]; | |
944 } | |
945 for (int i = 0; i < s_state->_stack_height; i++) { | |
946 d_state->_stack[i] = s_state->_stack[i]; | |
947 } | |
948 d_state->_stack_height = s_state->_stack_height; | |
949 d_state->_max_stack = s_state->_max_stack; | |
950 d_state->_initialized = true; | |
951 } else if (!dest->processed()) { | |
952 // we have not yet walked the bytecodes of dest, we can merge | |
953 // the states | |
954 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
955 for (int i = 0; i < nlocals; i++) { | |
956 d_state->_vars[i].set_union(s_state->_vars[i]); | |
957 } | |
958 for (int i = 0; i < s_state->_stack_height; i++) { | |
959 d_state->_stack[i].set_union(s_state->_stack[i]); | |
960 } | |
961 } else { | |
962 // the bytecodes of dest have already been processed, mark any | |
963 // arguments in the source state which are not in the dest state | |
964 // as global escape. | |
965 // Future refinement: we only need to mark these variable to the | |
966 // maximum escape of any variables in dest state | |
967 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
968 ArgumentMap extra_vars; | |
969 for (int i = 0; i < nlocals; i++) { | |
970 ArgumentMap t; | |
971 t = s_state->_vars[i]; | |
972 t.set_difference(d_state->_vars[i]); | |
973 extra_vars.set_union(t); | |
974 } | |
975 for (int i = 0; i < s_state->_stack_height; i++) { | |
976 ArgumentMap t; | |
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977 //extra_vars |= !d_state->_vars[i] & s_state->_vars[i]; |
0 | 978 t.clear(); |
979 t = s_state->_stack[i]; | |
980 t.set_difference(d_state->_stack[i]); | |
981 extra_vars.set_union(t); | |
982 } | |
983 set_global_escape(extra_vars); | |
984 } | |
985 } | |
986 | |
987 void BCEscapeAnalyzer::iterate_blocks(Arena *arena) { | |
988 int numblocks = _methodBlocks->num_blocks(); | |
989 int stkSize = _method->max_stack(); | |
990 int numLocals = _method->max_locals(); | |
991 StateInfo state; | |
992 | |
993 int datacount = (numblocks + 1) * (stkSize + numLocals); | |
994 int datasize = datacount * sizeof(ArgumentMap); | |
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995 StateInfo *blockstates = (StateInfo *) arena->Amalloc(numblocks * sizeof(StateInfo)); |
0 | 996 ArgumentMap *statedata = (ArgumentMap *) arena->Amalloc(datasize); |
997 for (int i = 0; i < datacount; i++) ::new ((void*)&statedata[i]) ArgumentMap(); | |
998 ArgumentMap *dp = statedata; | |
999 state._vars = dp; | |
1000 dp += numLocals; | |
1001 state._stack = dp; | |
1002 dp += stkSize; | |
1003 state._initialized = false; | |
1004 state._max_stack = stkSize; | |
1005 for (int i = 0; i < numblocks; i++) { | |
1006 blockstates[i]._vars = dp; | |
1007 dp += numLocals; | |
1008 blockstates[i]._stack = dp; | |
1009 dp += stkSize; | |
1010 blockstates[i]._initialized = false; | |
1011 blockstates[i]._stack_height = 0; | |
1012 blockstates[i]._max_stack = stkSize; | |
1013 } | |
1014 GrowableArray<ciBlock *> worklist(arena, numblocks / 4, 0, NULL); | |
1015 GrowableArray<ciBlock *> successors(arena, 4, 0, NULL); | |
1016 | |
1017 _methodBlocks->clear_processed(); | |
1018 | |
1019 // initialize block 0 state from method signature | |
1020 ArgumentMap allVars; // all oop arguments to method | |
1021 ciSignature* sig = method()->signature(); | |
1022 int j = 0; | |
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1023 ciBlock* first_blk = _methodBlocks->block_containing(0); |
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1024 int fb_i = first_blk->index(); |
0 | 1025 if (!method()->is_static()) { |
1026 // record information for "this" | |
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1027 blockstates[fb_i]._vars[j].set(j); |
0 | 1028 allVars.add(j); |
1029 j++; | |
1030 } | |
1031 for (int i = 0; i < sig->count(); i++) { | |
1032 ciType* t = sig->type_at(i); | |
1033 if (!t->is_primitive_type()) { | |
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1034 blockstates[fb_i]._vars[j].set(j); |
0 | 1035 allVars.add(j); |
1036 } | |
1037 j += t->size(); | |
1038 } | |
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1039 blockstates[fb_i]._initialized = true; |
0 | 1040 assert(j == _arg_size, "just checking"); |
1041 | |
1042 ArgumentMap unknown_map; | |
1043 unknown_map.add_unknown(); | |
1044 | |
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1045 worklist.push(first_blk); |
0 | 1046 while(worklist.length() > 0) { |
1047 ciBlock *blk = worklist.pop(); | |
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1048 StateInfo *blkState = blockstates + blk->index(); |
0 | 1049 if (blk->is_handler() || blk->is_ret_target()) { |
1050 // for an exception handler or a target of a ret instruction, we assume the worst case, | |
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1051 // that any variable could contain any argument |
0 | 1052 for (int i = 0; i < numLocals; i++) { |
1053 state._vars[i] = allVars; | |
1054 } | |
1055 if (blk->is_handler()) { | |
1056 state._stack_height = 1; | |
1057 } else { | |
1058 state._stack_height = blkState->_stack_height; | |
1059 } | |
1060 for (int i = 0; i < state._stack_height; i++) { | |
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1061 // ??? should this be unknown_map ??? |
0 | 1062 state._stack[i] = allVars; |
1063 } | |
1064 } else { | |
1065 for (int i = 0; i < numLocals; i++) { | |
1066 state._vars[i] = blkState->_vars[i]; | |
1067 } | |
1068 for (int i = 0; i < blkState->_stack_height; i++) { | |
1069 state._stack[i] = blkState->_stack[i]; | |
1070 } | |
1071 state._stack_height = blkState->_stack_height; | |
1072 } | |
1073 iterate_one_block(blk, state, successors); | |
1074 // if this block has any exception handlers, push them | |
1075 // onto successor list | |
1076 if (blk->has_handler()) { | |
1077 DEBUG_ONLY(int handler_count = 0;) | |
1078 int blk_start = blk->start_bci(); | |
1079 int blk_end = blk->limit_bci(); | |
1080 for (int i = 0; i < numblocks; i++) { | |
1081 ciBlock *b = _methodBlocks->block(i); | |
1082 if (b->is_handler()) { | |
1083 int ex_start = b->ex_start_bci(); | |
1084 int ex_end = b->ex_limit_bci(); | |
1085 if ((ex_start >= blk_start && ex_start < blk_end) || | |
1086 (ex_end > blk_start && ex_end <= blk_end)) { | |
1087 successors.push(b); | |
1088 } | |
1089 DEBUG_ONLY(handler_count++;) | |
1090 } | |
1091 } | |
1092 assert(handler_count > 0, "must find at least one handler"); | |
1093 } | |
1094 // merge computed variable state with successors | |
1095 while(successors.length() > 0) { | |
1096 ciBlock *succ = successors.pop(); | |
1097 merge_block_states(blockstates, succ, &state); | |
1098 if (!succ->processed()) | |
1099 worklist.push(succ); | |
1100 } | |
1101 } | |
1102 } | |
1103 | |
1104 bool BCEscapeAnalyzer::do_analysis() { | |
1105 Arena* arena = CURRENT_ENV->arena(); | |
1106 // identify basic blocks | |
1107 _methodBlocks = _method->get_method_blocks(); | |
1108 | |
1109 iterate_blocks(arena); | |
1110 // TEMPORARY | |
1111 return true; | |
1112 } | |
1113 | |
1114 vmIntrinsics::ID BCEscapeAnalyzer::known_intrinsic() { | |
1115 vmIntrinsics::ID iid = method()->intrinsic_id(); | |
1116 | |
1117 if (iid == vmIntrinsics::_getClass || | |
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1118 iid == vmIntrinsics::_fillInStackTrace || |
0 | 1119 iid == vmIntrinsics::_hashCode) |
1120 return iid; | |
1121 else | |
1122 return vmIntrinsics::_none; | |
1123 } | |
1124 | |
1125 bool BCEscapeAnalyzer::compute_escape_for_intrinsic(vmIntrinsics::ID iid) { | |
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1126 ArgumentMap arg; |
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1127 arg.clear(); |
0 | 1128 switch (iid) { |
1129 case vmIntrinsics::_getClass: | |
1130 _return_local = false; | |
1131 break; | |
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1132 case vmIntrinsics::_fillInStackTrace: |
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1133 arg.set(0); // 'this' |
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1134 set_returned(arg); |
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1135 break; |
0 | 1136 case vmIntrinsics::_hashCode: |
1137 // initialized state is correct | |
1138 break; | |
1139 default: | |
1140 assert(false, "unexpected intrinsic"); | |
1141 } | |
1142 return true; | |
1143 } | |
1144 | |
1145 void BCEscapeAnalyzer::initialize() { | |
1146 int i; | |
1147 | |
1148 // clear escape information (method may have been deoptimized) | |
1149 methodData()->clear_escape_info(); | |
1150 | |
1151 // initialize escape state of object parameters | |
1152 ciSignature* sig = method()->signature(); | |
1153 int j = 0; | |
1154 if (!method()->is_static()) { | |
1155 _arg_local.set_bit(0); | |
1156 _arg_stack.set_bit(0); | |
1157 j++; | |
1158 } | |
1159 for (i = 0; i < sig->count(); i++) { | |
1160 ciType* t = sig->type_at(i); | |
1161 if (!t->is_primitive_type()) { | |
1162 _arg_local.set_bit(j); | |
1163 _arg_stack.set_bit(j); | |
1164 } | |
1165 j += t->size(); | |
1166 } | |
1167 assert(j == _arg_size, "just checking"); | |
1168 | |
1169 // start with optimistic assumption | |
1170 ciType *rt = _method->return_type(); | |
1171 if (rt->is_primitive_type()) { | |
1172 _return_local = false; | |
1173 _return_allocated = false; | |
1174 } else { | |
1175 _return_local = true; | |
1176 _return_allocated = true; | |
1177 } | |
1178 _allocated_escapes = false; | |
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1179 _unknown_modified = false; |
0 | 1180 } |
1181 | |
1182 void BCEscapeAnalyzer::clear_escape_info() { | |
1183 ciSignature* sig = method()->signature(); | |
1184 int arg_count = sig->count(); | |
1185 ArgumentMap var; | |
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1186 if (!method()->is_static()) { |
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1187 arg_count++; // allow for "this" |
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1188 } |
0 | 1189 for (int i = 0; i < arg_count; i++) { |
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1190 set_arg_modified(i, OFFSET_ANY, 4); |
0 | 1191 var.clear(); |
1192 var.set(i); | |
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1193 set_modified(var, OFFSET_ANY, 4); |
0 | 1194 set_global_escape(var); |
1195 } | |
1196 _arg_local.clear(); | |
1197 _arg_stack.clear(); | |
1198 _arg_returned.clear(); | |
1199 _return_local = false; | |
1200 _return_allocated = false; | |
1201 _allocated_escapes = true; | |
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1202 _unknown_modified = true; |
0 | 1203 } |
1204 | |
1205 | |
1206 void BCEscapeAnalyzer::compute_escape_info() { | |
1207 int i; | |
1208 assert(!methodData()->has_escape_info(), "do not overwrite escape info"); | |
1209 | |
1210 vmIntrinsics::ID iid = known_intrinsic(); | |
1211 | |
1212 // check if method can be analyzed | |
1213 if (iid == vmIntrinsics::_none && (method()->is_abstract() || method()->is_native() || !method()->holder()->is_initialized() | |
1214 || _level > MaxBCEAEstimateLevel | |
1215 || method()->code_size() > MaxBCEAEstimateSize)) { | |
1216 if (BCEATraceLevel >= 1) { | |
1217 tty->print("Skipping method because: "); | |
1218 if (method()->is_abstract()) | |
1219 tty->print_cr("method is abstract."); | |
1220 else if (method()->is_native()) | |
1221 tty->print_cr("method is native."); | |
1222 else if (!method()->holder()->is_initialized()) | |
1223 tty->print_cr("class of method is not initialized."); | |
1224 else if (_level > MaxBCEAEstimateLevel) | |
1225 tty->print_cr("level (%d) exceeds MaxBCEAEstimateLevel (%d).", | |
1226 _level, MaxBCEAEstimateLevel); | |
1227 else if (method()->code_size() > MaxBCEAEstimateSize) | |
1228 tty->print_cr("code size (%d) exceeds MaxBCEAEstimateSize.", | |
1229 method()->code_size(), MaxBCEAEstimateSize); | |
1230 else | |
1231 ShouldNotReachHere(); | |
1232 } | |
1233 clear_escape_info(); | |
1234 | |
1235 return; | |
1236 } | |
1237 | |
1238 if (BCEATraceLevel >= 1) { | |
1239 tty->print("[EA] estimating escape information for"); | |
1240 if (iid != vmIntrinsics::_none) | |
1241 tty->print(" intrinsic"); | |
1242 method()->print_short_name(); | |
1243 tty->print_cr(" (%d bytes)", method()->code_size()); | |
1244 } | |
1245 | |
1246 bool success; | |
1247 | |
1248 initialize(); | |
1249 | |
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1250 // Do not scan method if it has no object parameters and |
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1251 // does not returns an object (_return_allocated is set in initialize()). |
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1252 if (_arg_local.is_empty() && !_return_allocated) { |
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1253 // Clear all info since method's bytecode was not analysed and |
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1254 // set pessimistic escape information. |
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1255 clear_escape_info(); |
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1256 methodData()->set_eflag(methodDataOopDesc::allocated_escapes); |
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1257 methodData()->set_eflag(methodDataOopDesc::unknown_modified); |
0 | 1258 methodData()->set_eflag(methodDataOopDesc::estimated); |
1259 return; | |
1260 } | |
1261 | |
1262 if (iid != vmIntrinsics::_none) | |
1263 success = compute_escape_for_intrinsic(iid); | |
1264 else { | |
1265 success = do_analysis(); | |
1266 } | |
1267 | |
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1268 // don't store interprocedural escape information if it introduces |
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1269 // dependencies or if method data is empty |
0 | 1270 // |
1271 if (!has_dependencies() && !methodData()->is_empty()) { | |
1272 for (i = 0; i < _arg_size; i++) { | |
1273 if (_arg_local.at(i)) { | |
1274 assert(_arg_stack.at(i), "inconsistent escape info"); | |
1275 methodData()->set_arg_local(i); | |
1276 methodData()->set_arg_stack(i); | |
1277 } else if (_arg_stack.at(i)) { | |
1278 methodData()->set_arg_stack(i); | |
1279 } | |
1280 if (_arg_returned.at(i)) { | |
1281 methodData()->set_arg_returned(i); | |
1282 } | |
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1283 methodData()->set_arg_modified(i, _arg_modified[i]); |
0 | 1284 } |
1285 if (_return_local) { | |
1286 methodData()->set_eflag(methodDataOopDesc::return_local); | |
1287 } | |
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1288 if (_return_allocated) { |
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1289 methodData()->set_eflag(methodDataOopDesc::return_allocated); |
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1290 } |
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1291 if (_allocated_escapes) { |
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1292 methodData()->set_eflag(methodDataOopDesc::allocated_escapes); |
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1293 } |
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1294 if (_unknown_modified) { |
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1295 methodData()->set_eflag(methodDataOopDesc::unknown_modified); |
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1296 } |
0 | 1297 methodData()->set_eflag(methodDataOopDesc::estimated); |
1298 } | |
1299 } | |
1300 | |
1301 void BCEscapeAnalyzer::read_escape_info() { | |
1302 assert(methodData()->has_escape_info(), "no escape info available"); | |
1303 | |
1304 // read escape information from method descriptor | |
1305 for (int i = 0; i < _arg_size; i++) { | |
1306 _arg_local.at_put(i, methodData()->is_arg_local(i)); | |
1307 _arg_stack.at_put(i, methodData()->is_arg_stack(i)); | |
1308 _arg_returned.at_put(i, methodData()->is_arg_returned(i)); | |
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1309 _arg_modified[i] = methodData()->arg_modified(i); |
0 | 1310 } |
1311 _return_local = methodData()->eflag_set(methodDataOopDesc::return_local); | |
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1312 _return_allocated = methodData()->eflag_set(methodDataOopDesc::return_allocated); |
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1313 _allocated_escapes = methodData()->eflag_set(methodDataOopDesc::allocated_escapes); |
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1314 _unknown_modified = methodData()->eflag_set(methodDataOopDesc::unknown_modified); |
0 | 1315 |
1316 } | |
1317 | |
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1318 #ifndef PRODUCT |
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1319 void BCEscapeAnalyzer::dump() { |
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1320 tty->print("[EA] estimated escape information for"); |
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1321 method()->print_short_name(); |
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1322 tty->print_cr(has_dependencies() ? " (not stored)" : ""); |
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1323 tty->print(" non-escaping args: "); |
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1324 _arg_local.print_on(tty); |
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1325 tty->print(" stack-allocatable args: "); |
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1326 _arg_stack.print_on(tty); |
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1327 if (_return_local) { |
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1328 tty->print(" returned args: "); |
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1329 _arg_returned.print_on(tty); |
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1330 } else if (is_return_allocated()) { |
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1331 tty->print_cr(" return allocated value"); |
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1332 } else { |
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1333 tty->print_cr(" return non-local value"); |
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1334 } |
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1335 tty->print(" modified args: "); |
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1336 for (int i = 0; i < _arg_size; i++) { |
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1337 if (_arg_modified[i] == 0) |
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1338 tty->print(" 0"); |
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1339 else |
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1340 tty->print(" 0x%x", _arg_modified[i]); |
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1341 } |
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1342 tty->cr(); |
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1343 tty->print(" flags: "); |
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1344 if (_return_allocated) |
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1345 tty->print(" return_allocated"); |
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1346 if (_allocated_escapes) |
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1347 tty->print(" allocated_escapes"); |
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1348 if (_unknown_modified) |
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1349 tty->print(" unknown_modified"); |
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1350 tty->cr(); |
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1351 } |
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1352 #endif |
0 | 1353 |
1354 BCEscapeAnalyzer::BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent) | |
1355 : _conservative(method == NULL || !EstimateArgEscape) | |
1356 , _method(method) | |
1357 , _methodData(method ? method->method_data() : NULL) | |
1358 , _arg_size(method ? method->arg_size() : 0) | |
1359 , _stack() | |
1360 , _arg_local(_arg_size) | |
1361 , _arg_stack(_arg_size) | |
1362 , _arg_returned(_arg_size) | |
1363 , _dirty(_arg_size) | |
1364 , _return_local(false) | |
1365 , _return_allocated(false) | |
1366 , _allocated_escapes(false) | |
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1367 , _unknown_modified(false) |
0 | 1368 , _dependencies() |
1369 , _parent(parent) | |
1370 , _level(parent == NULL ? 0 : parent->level() + 1) { | |
1371 if (!_conservative) { | |
1372 _arg_local.clear(); | |
1373 _arg_stack.clear(); | |
1374 _arg_returned.clear(); | |
1375 _dirty.clear(); | |
1376 Arena* arena = CURRENT_ENV->arena(); | |
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1377 _arg_modified = (uint *) arena->Amalloc(_arg_size * sizeof(uint)); |
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1378 Copy::zero_to_bytes(_arg_modified, _arg_size * sizeof(uint)); |
0 | 1379 |
1380 if (methodData() == NULL) | |
1381 return; | |
1382 bool printit = _method->should_print_assembly(); | |
1383 if (methodData()->has_escape_info()) { | |
1384 TRACE_BCEA(2, tty->print_cr("[EA] Reading previous results for %s.%s", | |
1385 method->holder()->name()->as_utf8(), | |
1386 method->name()->as_utf8())); | |
1387 read_escape_info(); | |
1388 } else { | |
1389 TRACE_BCEA(2, tty->print_cr("[EA] computing results for %s.%s", | |
1390 method->holder()->name()->as_utf8(), | |
1391 method->name()->as_utf8())); | |
1392 | |
1393 compute_escape_info(); | |
1394 methodData()->update_escape_info(); | |
1395 } | |
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1396 #ifndef PRODUCT |
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1397 if (BCEATraceLevel >= 3) { |
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1398 // dump escape information |
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1399 dump(); |
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1400 } |
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1401 #endif |
0 | 1402 } |
1403 } | |
1404 | |
1405 void BCEscapeAnalyzer::copy_dependencies(Dependencies *deps) { | |
1406 if(!has_dependencies()) | |
1407 return; | |
1408 for (int i = 0; i < _dependencies.length(); i+=2) { | |
1409 ciKlass *k = _dependencies[i]->as_klass(); | |
1410 ciMethod *m = _dependencies[i+1]->as_method(); | |
1411 deps->assert_unique_concrete_method(k, m); | |
1412 } | |
1413 } |