Mercurial > hg > truffle
annotate src/share/vm/ci/ciTypeFlow.hpp @ 4530:6c6cb7be1324
bugfix
author | Christian Haeubl <christian.haeubl@oracle.com> |
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date | Wed, 08 Feb 2012 21:13:35 -0800 |
parents | e863062e521d |
children | e9a5e0a812c8 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
1552
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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 #ifndef SHARE_VM_CI_CITYPEFLOW_HPP |
26 #define SHARE_VM_CI_CITYPEFLOW_HPP | |
27 | |
28 #ifdef COMPILER2 | |
29 #include "ci/ciEnv.hpp" | |
30 #include "ci/ciKlass.hpp" | |
31 #include "ci/ciMethodBlocks.hpp" | |
32 #endif | |
33 #ifdef SHARK | |
34 #include "ci/ciEnv.hpp" | |
35 #include "ci/ciKlass.hpp" | |
36 #include "ci/ciMethodBlocks.hpp" | |
2447 | 37 #include "shark/shark_globals.hpp" |
1972 | 38 #endif |
39 | |
0 | 40 |
41 class ciTypeFlow : public ResourceObj { | |
42 private: | |
43 ciEnv* _env; | |
44 ciMethod* _method; | |
45 ciMethodBlocks* _methodBlocks; | |
46 int _osr_bci; | |
47 | |
48 // information cached from the method: | |
49 int _max_locals; | |
50 int _max_stack; | |
51 int _code_size; | |
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52 bool _has_irreducible_entry; |
0 | 53 |
54 const char* _failure_reason; | |
55 | |
56 public: | |
57 class StateVector; | |
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58 class Loop; |
0 | 59 class Block; |
60 | |
61 // Build a type flow analyzer | |
62 // Do an OSR analysis if osr_bci >= 0. | |
63 ciTypeFlow(ciEnv* env, ciMethod* method, int osr_bci = InvocationEntryBci); | |
64 | |
65 // Accessors | |
66 ciMethod* method() const { return _method; } | |
67 ciEnv* env() { return _env; } | |
68 Arena* arena() { return _env->arena(); } | |
69 bool is_osr_flow() const{ return _osr_bci != InvocationEntryBci; } | |
70 int start_bci() const { return is_osr_flow()? _osr_bci: 0; } | |
71 int max_locals() const { return _max_locals; } | |
72 int max_stack() const { return _max_stack; } | |
73 int max_cells() const { return _max_locals + _max_stack; } | |
74 int code_size() const { return _code_size; } | |
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75 bool has_irreducible_entry() const { return _has_irreducible_entry; } |
0 | 76 |
77 // Represents information about an "active" jsr call. This | |
78 // class represents a call to the routine at some entry address | |
79 // with some distinct return address. | |
80 class JsrRecord : public ResourceObj { | |
81 private: | |
82 int _entry_address; | |
83 int _return_address; | |
84 public: | |
85 JsrRecord(int entry_address, int return_address) { | |
86 _entry_address = entry_address; | |
87 _return_address = return_address; | |
88 } | |
89 | |
90 int entry_address() const { return _entry_address; } | |
91 int return_address() const { return _return_address; } | |
92 | |
93 void print_on(outputStream* st) const { | |
94 #ifndef PRODUCT | |
95 st->print("%d->%d", entry_address(), return_address()); | |
96 #endif | |
97 } | |
98 }; | |
99 | |
100 // A JsrSet represents some set of JsrRecords. This class | |
101 // is used to record a set of all jsr routines which we permit | |
102 // execution to return (ret) from. | |
103 // | |
104 // During abstract interpretation, JsrSets are used to determine | |
105 // whether two paths which reach a given block are unique, and | |
106 // should be cloned apart, or are compatible, and should merge | |
107 // together. | |
108 // | |
109 // Note that different amounts of effort can be expended determining | |
110 // if paths are compatible. <DISCUSSION> | |
111 class JsrSet : public ResourceObj { | |
112 private: | |
113 GrowableArray<JsrRecord*>* _set; | |
114 | |
115 JsrRecord* record_at(int i) { | |
116 return _set->at(i); | |
117 } | |
118 | |
119 // Insert the given JsrRecord into the JsrSet, maintaining the order | |
120 // of the set and replacing any element with the same entry address. | |
121 void insert_jsr_record(JsrRecord* record); | |
122 | |
123 // Remove the JsrRecord with the given return address from the JsrSet. | |
124 void remove_jsr_record(int return_address); | |
125 | |
126 public: | |
127 JsrSet(Arena* arena, int default_len = 4); | |
128 | |
129 // Copy this JsrSet. | |
130 void copy_into(JsrSet* jsrs); | |
131 | |
132 // Is this JsrSet compatible with some other JsrSet? | |
133 bool is_compatible_with(JsrSet* other); | |
134 | |
135 // Apply the effect of a single bytecode to the JsrSet. | |
136 void apply_control(ciTypeFlow* analyzer, | |
137 ciBytecodeStream* str, | |
138 StateVector* state); | |
139 | |
140 // What is the cardinality of this set? | |
141 int size() const { return _set->length(); } | |
142 | |
143 void print_on(outputStream* st) const PRODUCT_RETURN; | |
144 }; | |
145 | |
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146 class LocalSet VALUE_OBJ_CLASS_SPEC { |
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147 private: |
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148 enum Constants { max = 63 }; |
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149 uint64_t _bits; |
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150 public: |
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151 LocalSet() : _bits(0) {} |
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152 void add(uint32_t i) { if (i < (uint32_t)max) _bits |= (1LL << i); } |
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153 void add(LocalSet* ls) { _bits |= ls->_bits; } |
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154 bool test(uint32_t i) const { return i < (uint32_t)max ? (_bits>>i)&1U : true; } |
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155 void clear() { _bits = 0; } |
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156 void print_on(outputStream* st, int limit) const PRODUCT_RETURN; |
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157 }; |
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158 |
0 | 159 // Used as a combined index for locals and temps |
160 enum Cell { | |
303 | 161 Cell_0, Cell_max = INT_MAX |
0 | 162 }; |
163 | |
164 // A StateVector summarizes the type information at some | |
165 // point in the program | |
166 class StateVector : public ResourceObj { | |
167 private: | |
168 ciType** _types; | |
169 int _stack_size; | |
170 int _monitor_count; | |
171 ciTypeFlow* _outer; | |
172 | |
173 int _trap_bci; | |
174 int _trap_index; | |
175 | |
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176 LocalSet _def_locals; // For entire block |
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177 |
0 | 178 static ciType* type_meet_internal(ciType* t1, ciType* t2, ciTypeFlow* analyzer); |
179 | |
180 public: | |
181 // Special elements in our type lattice. | |
182 enum { | |
183 T_TOP = T_VOID, // why not? | |
184 T_BOTTOM = T_CONFLICT, | |
185 T_LONG2 = T_SHORT, // 2nd word of T_LONG | |
186 T_DOUBLE2 = T_CHAR, // 2nd word of T_DOUBLE | |
187 T_NULL = T_BYTE // for now. | |
188 }; | |
189 static ciType* top_type() { return ciType::make((BasicType)T_TOP); } | |
190 static ciType* bottom_type() { return ciType::make((BasicType)T_BOTTOM); } | |
191 static ciType* long2_type() { return ciType::make((BasicType)T_LONG2); } | |
192 static ciType* double2_type(){ return ciType::make((BasicType)T_DOUBLE2); } | |
193 static ciType* null_type() { return ciType::make((BasicType)T_NULL); } | |
194 | |
195 static ciType* half_type(ciType* t) { | |
196 switch (t->basic_type()) { | |
197 case T_LONG: return long2_type(); | |
198 case T_DOUBLE: return double2_type(); | |
199 default: ShouldNotReachHere(); return NULL; | |
200 } | |
201 } | |
202 | |
203 // The meet operation for our type lattice. | |
204 ciType* type_meet(ciType* t1, ciType* t2) { | |
205 return type_meet_internal(t1, t2, outer()); | |
206 } | |
207 | |
208 // Accessors | |
209 ciTypeFlow* outer() const { return _outer; } | |
210 | |
211 int stack_size() const { return _stack_size; } | |
212 void set_stack_size(int ss) { _stack_size = ss; } | |
213 | |
214 int monitor_count() const { return _monitor_count; } | |
215 void set_monitor_count(int mc) { _monitor_count = mc; } | |
216 | |
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217 LocalSet* def_locals() { return &_def_locals; } |
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218 const LocalSet* def_locals() const { return &_def_locals; } |
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219 |
0 | 220 static Cell start_cell() { return (Cell)0; } |
221 static Cell next_cell(Cell c) { return (Cell)(((int)c) + 1); } | |
222 Cell limit_cell() const { | |
223 return (Cell)(outer()->max_locals() + stack_size()); | |
224 } | |
225 | |
226 // Cell creation | |
227 Cell local(int lnum) const { | |
228 assert(lnum < outer()->max_locals(), "index check"); | |
229 return (Cell)(lnum); | |
230 } | |
231 | |
232 Cell stack(int snum) const { | |
233 assert(snum < stack_size(), "index check"); | |
234 return (Cell)(outer()->max_locals() + snum); | |
235 } | |
236 | |
237 Cell tos() const { return stack(stack_size()-1); } | |
238 | |
239 // For external use only: | |
240 ciType* local_type_at(int i) const { return type_at(local(i)); } | |
241 ciType* stack_type_at(int i) const { return type_at(stack(i)); } | |
242 | |
243 // Accessors for the type of some Cell c | |
244 ciType* type_at(Cell c) const { | |
245 assert(start_cell() <= c && c < limit_cell(), "out of bounds"); | |
246 return _types[c]; | |
247 } | |
248 | |
249 void set_type_at(Cell c, ciType* type) { | |
250 assert(start_cell() <= c && c < limit_cell(), "out of bounds"); | |
251 _types[c] = type; | |
252 } | |
253 | |
254 // Top-of-stack operations. | |
255 void set_type_at_tos(ciType* type) { set_type_at(tos(), type); } | |
256 ciType* type_at_tos() const { return type_at(tos()); } | |
257 | |
258 void push(ciType* type) { | |
259 _stack_size++; | |
260 set_type_at_tos(type); | |
261 } | |
262 void pop() { | |
263 debug_only(set_type_at_tos(bottom_type())); | |
264 _stack_size--; | |
265 } | |
266 ciType* pop_value() { | |
267 ciType* t = type_at_tos(); | |
268 pop(); | |
269 return t; | |
270 } | |
271 | |
272 // Convenience operations. | |
273 bool is_reference(ciType* type) const { | |
274 return type == null_type() || !type->is_primitive_type(); | |
275 } | |
276 bool is_int(ciType* type) const { | |
277 return type->basic_type() == T_INT; | |
278 } | |
279 bool is_long(ciType* type) const { | |
280 return type->basic_type() == T_LONG; | |
281 } | |
282 bool is_float(ciType* type) const { | |
283 return type->basic_type() == T_FLOAT; | |
284 } | |
285 bool is_double(ciType* type) const { | |
286 return type->basic_type() == T_DOUBLE; | |
287 } | |
288 | |
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289 void store_to_local(int lnum) { |
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290 _def_locals.add((uint) lnum); |
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291 } |
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292 |
0 | 293 void push_translate(ciType* type); |
294 | |
295 void push_int() { | |
296 push(ciType::make(T_INT)); | |
297 } | |
298 void pop_int() { | |
299 assert(is_int(type_at_tos()), "must be integer"); | |
300 pop(); | |
301 } | |
302 void check_int(Cell c) { | |
303 assert(is_int(type_at(c)), "must be integer"); | |
304 } | |
305 void push_double() { | |
306 push(ciType::make(T_DOUBLE)); | |
307 push(double2_type()); | |
308 } | |
309 void pop_double() { | |
310 assert(type_at_tos() == double2_type(), "must be 2nd half"); | |
311 pop(); | |
312 assert(is_double(type_at_tos()), "must be double"); | |
313 pop(); | |
314 } | |
315 void push_float() { | |
316 push(ciType::make(T_FLOAT)); | |
317 } | |
318 void pop_float() { | |
319 assert(is_float(type_at_tos()), "must be float"); | |
320 pop(); | |
321 } | |
322 void push_long() { | |
323 push(ciType::make(T_LONG)); | |
324 push(long2_type()); | |
325 } | |
326 void pop_long() { | |
327 assert(type_at_tos() == long2_type(), "must be 2nd half"); | |
328 pop(); | |
329 assert(is_long(type_at_tos()), "must be long"); | |
330 pop(); | |
331 } | |
332 void push_object(ciKlass* klass) { | |
333 push(klass); | |
334 } | |
335 void pop_object() { | |
336 assert(is_reference(type_at_tos()), "must be reference type"); | |
337 pop(); | |
338 } | |
339 void pop_array() { | |
340 assert(type_at_tos() == null_type() || | |
341 type_at_tos()->is_array_klass(), "must be array type"); | |
342 pop(); | |
343 } | |
344 // pop_objArray and pop_typeArray narrow the tos to ciObjArrayKlass | |
345 // or ciTypeArrayKlass (resp.). In the rare case that an explicit | |
346 // null is popped from the stack, we return NULL. Caller beware. | |
347 ciObjArrayKlass* pop_objArray() { | |
348 ciType* array = pop_value(); | |
349 if (array == null_type()) return NULL; | |
350 assert(array->is_obj_array_klass(), "must be object array type"); | |
351 return array->as_obj_array_klass(); | |
352 } | |
353 ciTypeArrayKlass* pop_typeArray() { | |
354 ciType* array = pop_value(); | |
355 if (array == null_type()) return NULL; | |
356 assert(array->is_type_array_klass(), "must be prim array type"); | |
357 return array->as_type_array_klass(); | |
358 } | |
359 void push_null() { | |
360 push(null_type()); | |
361 } | |
362 void do_null_assert(ciKlass* unloaded_klass); | |
363 | |
364 // Helper convenience routines. | |
365 void do_aaload(ciBytecodeStream* str); | |
366 void do_checkcast(ciBytecodeStream* str); | |
367 void do_getfield(ciBytecodeStream* str); | |
368 void do_getstatic(ciBytecodeStream* str); | |
369 void do_invoke(ciBytecodeStream* str, bool has_receiver); | |
370 void do_jsr(ciBytecodeStream* str); | |
371 void do_ldc(ciBytecodeStream* str); | |
372 void do_multianewarray(ciBytecodeStream* str); | |
373 void do_new(ciBytecodeStream* str); | |
374 void do_newarray(ciBytecodeStream* str); | |
375 void do_putfield(ciBytecodeStream* str); | |
376 void do_putstatic(ciBytecodeStream* str); | |
377 void do_ret(ciBytecodeStream* str); | |
378 | |
379 void overwrite_local_double_long(int index) { | |
380 // Invalidate the previous local if it contains first half of | |
381 // a double or long value since it's seconf half is being overwritten. | |
382 int prev_index = index - 1; | |
383 if (prev_index >= 0 && | |
384 (is_double(type_at(local(prev_index))) || | |
385 is_long(type_at(local(prev_index))))) { | |
386 set_type_at(local(prev_index), bottom_type()); | |
387 } | |
388 } | |
389 | |
390 void load_local_object(int index) { | |
391 ciType* type = type_at(local(index)); | |
392 assert(is_reference(type), "must be reference type"); | |
393 push(type); | |
394 } | |
395 void store_local_object(int index) { | |
396 ciType* type = pop_value(); | |
397 assert(is_reference(type) || type->is_return_address(), | |
398 "must be reference type or return address"); | |
399 overwrite_local_double_long(index); | |
400 set_type_at(local(index), type); | |
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401 store_to_local(index); |
0 | 402 } |
403 | |
404 void load_local_double(int index) { | |
405 ciType* type = type_at(local(index)); | |
406 ciType* type2 = type_at(local(index+1)); | |
407 assert(is_double(type), "must be double type"); | |
408 assert(type2 == double2_type(), "must be 2nd half"); | |
409 push(type); | |
410 push(double2_type()); | |
411 } | |
412 void store_local_double(int index) { | |
413 ciType* type2 = pop_value(); | |
414 ciType* type = pop_value(); | |
415 assert(is_double(type), "must be double"); | |
416 assert(type2 == double2_type(), "must be 2nd half"); | |
417 overwrite_local_double_long(index); | |
418 set_type_at(local(index), type); | |
419 set_type_at(local(index+1), type2); | |
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420 store_to_local(index); |
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421 store_to_local(index+1); |
0 | 422 } |
423 | |
424 void load_local_float(int index) { | |
425 ciType* type = type_at(local(index)); | |
426 assert(is_float(type), "must be float type"); | |
427 push(type); | |
428 } | |
429 void store_local_float(int index) { | |
430 ciType* type = pop_value(); | |
431 assert(is_float(type), "must be float type"); | |
432 overwrite_local_double_long(index); | |
433 set_type_at(local(index), type); | |
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434 store_to_local(index); |
0 | 435 } |
436 | |
437 void load_local_int(int index) { | |
438 ciType* type = type_at(local(index)); | |
439 assert(is_int(type), "must be int type"); | |
440 push(type); | |
441 } | |
442 void store_local_int(int index) { | |
443 ciType* type = pop_value(); | |
444 assert(is_int(type), "must be int type"); | |
445 overwrite_local_double_long(index); | |
446 set_type_at(local(index), type); | |
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447 store_to_local(index); |
0 | 448 } |
449 | |
450 void load_local_long(int index) { | |
451 ciType* type = type_at(local(index)); | |
452 ciType* type2 = type_at(local(index+1)); | |
453 assert(is_long(type), "must be long type"); | |
454 assert(type2 == long2_type(), "must be 2nd half"); | |
455 push(type); | |
456 push(long2_type()); | |
457 } | |
458 void store_local_long(int index) { | |
459 ciType* type2 = pop_value(); | |
460 ciType* type = pop_value(); | |
461 assert(is_long(type), "must be long"); | |
462 assert(type2 == long2_type(), "must be 2nd half"); | |
463 overwrite_local_double_long(index); | |
464 set_type_at(local(index), type); | |
465 set_type_at(local(index+1), type2); | |
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466 store_to_local(index); |
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467 store_to_local(index+1); |
0 | 468 } |
469 | |
470 // Stop interpretation of this path with a trap. | |
471 void trap(ciBytecodeStream* str, ciKlass* klass, int index); | |
472 | |
473 public: | |
474 StateVector(ciTypeFlow* outer); | |
475 | |
476 // Copy our value into some other StateVector | |
477 void copy_into(StateVector* copy) const; | |
478 | |
479 // Meets this StateVector with another, destructively modifying this | |
480 // one. Returns true if any modification takes place. | |
481 bool meet(const StateVector* incoming); | |
482 | |
483 // Ditto, except that the incoming state is coming from an exception. | |
484 bool meet_exception(ciInstanceKlass* exc, const StateVector* incoming); | |
485 | |
486 // Apply the effect of one bytecode to this StateVector | |
487 bool apply_one_bytecode(ciBytecodeStream* stream); | |
488 | |
489 // What is the bci of the trap? | |
490 int trap_bci() { return _trap_bci; } | |
491 | |
492 // What is the index associated with the trap? | |
493 int trap_index() { return _trap_index; } | |
494 | |
495 void print_cell_on(outputStream* st, Cell c) const PRODUCT_RETURN; | |
496 void print_on(outputStream* st) const PRODUCT_RETURN; | |
497 }; | |
498 | |
499 // Parameter for "find_block" calls: | |
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500 // Describes the difference between a public and backedge copy. |
0 | 501 enum CreateOption { |
502 create_public_copy, | |
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503 create_backedge_copy, |
0 | 504 no_create |
505 }; | |
506 | |
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507 // Successor iterator |
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508 class SuccIter : public StackObj { |
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509 private: |
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510 Block* _pred; |
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511 int _index; |
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512 Block* _succ; |
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513 public: |
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514 SuccIter() : _pred(NULL), _index(-1), _succ(NULL) {} |
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515 SuccIter(Block* pred) : _pred(pred), _index(-1), _succ(NULL) { next(); } |
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516 int index() { return _index; } |
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517 Block* pred() { return _pred; } // Return predecessor |
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518 bool done() { return _index < 0; } // Finished? |
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519 Block* succ() { return _succ; } // Return current successor |
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520 void next(); // Advance |
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521 void set_succ(Block* succ); // Update current successor |
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522 bool is_normal_ctrl() { return index() < _pred->successors()->length(); } |
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523 }; |
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524 |
0 | 525 // A basic block |
526 class Block : public ResourceObj { | |
527 private: | |
528 ciBlock* _ciblock; | |
529 GrowableArray<Block*>* _exceptions; | |
530 GrowableArray<ciInstanceKlass*>* _exc_klasses; | |
531 GrowableArray<Block*>* _successors; | |
532 StateVector* _state; | |
533 JsrSet* _jsrs; | |
534 | |
535 int _trap_bci; | |
536 int _trap_index; | |
537 | |
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538 // pre_order, assigned at first visit. Used as block ID and "visited" tag |
0 | 539 int _pre_order; |
540 | |
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541 // A post-order, used to compute the reverse post order (RPO) provided to the client |
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542 int _post_order; // used to compute rpo |
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543 |
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544 // Has this block been cloned for a loop backedge? |
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545 bool _backedge_copy; |
0 | 546 |
547 // A pointer used for our internal work list | |
367
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548 Block* _next; |
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549 bool _on_work_list; // on the work list |
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550 Block* _rpo_next; // Reverse post order list |
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551 |
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552 // Loop info |
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553 Loop* _loop; // nearest loop |
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554 bool _irreducible_entry; // entry to irreducible loop |
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555 bool _exception_entry; // entry to exception handler |
0 | 556 |
557 ciBlock* ciblock() const { return _ciblock; } | |
558 StateVector* state() const { return _state; } | |
559 | |
560 // Compute the exceptional successors and types for this Block. | |
561 void compute_exceptions(); | |
562 | |
563 public: | |
564 // constructors | |
565 Block(ciTypeFlow* outer, ciBlock* ciblk, JsrSet* jsrs); | |
566 | |
567 void set_trap(int trap_bci, int trap_index) { | |
568 _trap_bci = trap_bci; | |
569 _trap_index = trap_index; | |
570 assert(has_trap(), ""); | |
571 } | |
572 bool has_trap() const { return _trap_bci != -1; } | |
573 int trap_bci() const { assert(has_trap(), ""); return _trap_bci; } | |
574 int trap_index() const { assert(has_trap(), ""); return _trap_index; } | |
575 | |
576 // accessors | |
577 ciTypeFlow* outer() const { return state()->outer(); } | |
578 int start() const { return _ciblock->start_bci(); } | |
579 int limit() const { return _ciblock->limit_bci(); } | |
580 int control() const { return _ciblock->control_bci(); } | |
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581 JsrSet* jsrs() const { return _jsrs; } |
0 | 582 |
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583 bool is_backedge_copy() const { return _backedge_copy; } |
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584 void set_backedge_copy(bool z); |
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585 int backedge_copy_count() const { return outer()->backedge_copy_count(ciblock()->index(), _jsrs); } |
0 | 586 |
587 // access to entry state | |
588 int stack_size() const { return _state->stack_size(); } | |
589 int monitor_count() const { return _state->monitor_count(); } | |
590 ciType* local_type_at(int i) const { return _state->local_type_at(i); } | |
591 ciType* stack_type_at(int i) const { return _state->stack_type_at(i); } | |
592 | |
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593 // Data flow on locals |
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594 bool is_invariant_local(uint v) const { |
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595 assert(is_loop_head(), "only loop heads"); |
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596 // Find outermost loop with same loop head |
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597 Loop* lp = loop(); |
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598 while (lp->parent() != NULL) { |
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599 if (lp->parent()->head() != lp->head()) break; |
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600 lp = lp->parent(); |
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601 } |
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602 return !lp->def_locals()->test(v); |
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603 } |
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604 LocalSet* def_locals() { return _state->def_locals(); } |
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605 const LocalSet* def_locals() const { return _state->def_locals(); } |
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606 |
0 | 607 // Get the successors for this Block. |
608 GrowableArray<Block*>* successors(ciBytecodeStream* str, | |
609 StateVector* state, | |
610 JsrSet* jsrs); | |
611 GrowableArray<Block*>* successors() { | |
612 assert(_successors != NULL, "must be filled in"); | |
613 return _successors; | |
614 } | |
615 | |
616 // Get the exceptional successors for this Block. | |
617 GrowableArray<Block*>* exceptions() { | |
618 if (_exceptions == NULL) { | |
619 compute_exceptions(); | |
620 } | |
621 return _exceptions; | |
622 } | |
623 | |
624 // Get the exception klasses corresponding to the | |
625 // exceptional successors for this Block. | |
626 GrowableArray<ciInstanceKlass*>* exc_klasses() { | |
627 if (_exc_klasses == NULL) { | |
628 compute_exceptions(); | |
629 } | |
630 return _exc_klasses; | |
631 } | |
632 | |
633 // Is this Block compatible with a given JsrSet? | |
634 bool is_compatible_with(JsrSet* other) { | |
635 return _jsrs->is_compatible_with(other); | |
636 } | |
637 | |
638 // Copy the value of our state vector into another. | |
639 void copy_state_into(StateVector* copy) const { | |
640 _state->copy_into(copy); | |
641 } | |
642 | |
643 // Copy the value of our JsrSet into another | |
644 void copy_jsrs_into(JsrSet* copy) const { | |
645 _jsrs->copy_into(copy); | |
646 } | |
647 | |
648 // Meets the start state of this block with another state, destructively | |
649 // modifying this one. Returns true if any modification takes place. | |
650 bool meet(const StateVector* incoming) { | |
651 return state()->meet(incoming); | |
652 } | |
653 | |
654 // Ditto, except that the incoming state is coming from an | |
655 // exception path. This means the stack is replaced by the | |
656 // appropriate exception type. | |
657 bool meet_exception(ciInstanceKlass* exc, const StateVector* incoming) { | |
658 return state()->meet_exception(exc, incoming); | |
659 } | |
660 | |
661 // Work list manipulation | |
662 void set_next(Block* block) { _next = block; } | |
663 Block* next() const { return _next; } | |
664 | |
665 void set_on_work_list(bool c) { _on_work_list = c; } | |
666 bool is_on_work_list() const { return _on_work_list; } | |
667 | |
668 bool has_pre_order() const { return _pre_order >= 0; } | |
367
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669 void set_pre_order(int po) { assert(!has_pre_order(), ""); _pre_order = po; } |
0 | 670 int pre_order() const { assert(has_pre_order(), ""); return _pre_order; } |
367
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671 void set_next_pre_order() { set_pre_order(outer()->inc_next_pre_order()); } |
0 | 672 bool is_start() const { return _pre_order == outer()->start_block_num(); } |
673 | |
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674 // Reverse post order |
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675 void df_init(); |
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676 bool has_post_order() const { return _post_order >= 0; } |
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677 void set_post_order(int po) { assert(!has_post_order() && po >= 0, ""); _post_order = po; } |
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678 void reset_post_order(int o){ _post_order = o; } |
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679 int post_order() const { assert(has_post_order(), ""); return _post_order; } |
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680 |
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681 bool has_rpo() const { return has_post_order() && outer()->have_block_count(); } |
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682 int rpo() const { assert(has_rpo(), ""); return outer()->block_count() - post_order() - 1; } |
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683 void set_rpo_next(Block* b) { _rpo_next = b; } |
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684 Block* rpo_next() { return _rpo_next; } |
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685 |
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686 // Loops |
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687 Loop* loop() const { return _loop; } |
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688 void set_loop(Loop* lp) { _loop = lp; } |
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689 bool is_loop_head() const { return _loop && _loop->head() == this; } |
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690 void set_irreducible_entry(bool c) { _irreducible_entry = c; } |
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691 bool is_irreducible_entry() const { return _irreducible_entry; } |
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692 bool is_visited() const { return has_pre_order(); } |
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693 bool is_post_visited() const { return has_post_order(); } |
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694 bool is_clonable_exit(Loop* lp); |
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695 Block* looping_succ(Loop* lp); // Successor inside of loop |
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696 bool is_single_entry_loop_head() const { |
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697 if (!is_loop_head()) return false; |
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698 for (Loop* lp = loop(); lp != NULL && lp->head() == this; lp = lp->parent()) |
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699 if (lp->is_irreducible()) return false; |
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700 return true; |
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701 } |
0 | 702 |
703 void print_value_on(outputStream* st) const PRODUCT_RETURN; | |
704 void print_on(outputStream* st) const PRODUCT_RETURN; | |
705 }; | |
706 | |
367
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707 // Loop |
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708 class Loop : public ResourceObj { |
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709 private: |
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710 Loop* _parent; |
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711 Loop* _sibling; // List of siblings, null terminated |
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712 Loop* _child; // Head of child list threaded thru sibling pointer |
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713 Block* _head; // Head of loop |
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714 Block* _tail; // Tail of loop |
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715 bool _irreducible; |
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716 LocalSet _def_locals; |
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717 |
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718 public: |
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719 Loop(Block* head, Block* tail) : |
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720 _head(head), _tail(tail), |
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721 _parent(NULL), _sibling(NULL), _child(NULL), |
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722 _irreducible(false), _def_locals() {} |
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723 |
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724 Loop* parent() const { return _parent; } |
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725 Loop* sibling() const { return _sibling; } |
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726 Loop* child() const { return _child; } |
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727 Block* head() const { return _head; } |
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728 Block* tail() const { return _tail; } |
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729 void set_parent(Loop* p) { _parent = p; } |
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730 void set_sibling(Loop* s) { _sibling = s; } |
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731 void set_child(Loop* c) { _child = c; } |
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732 void set_head(Block* hd) { _head = hd; } |
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733 void set_tail(Block* tl) { _tail = tl; } |
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734 |
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735 int depth() const; // nesting depth |
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736 |
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737 // Returns true if lp is a nested loop or us. |
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738 bool contains(Loop* lp) const; |
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739 bool contains(Block* blk) const { return contains(blk->loop()); } |
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740 |
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741 // Data flow on locals |
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742 LocalSet* def_locals() { return &_def_locals; } |
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743 const LocalSet* def_locals() const { return &_def_locals; } |
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744 |
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745 // Merge the branch lp into this branch, sorting on the loop head |
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746 // pre_orders. Returns the new branch. |
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747 Loop* sorted_merge(Loop* lp); |
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748 |
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749 // Mark non-single entry to loop |
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750 void set_irreducible(Block* entry) { |
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751 _irreducible = true; |
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752 entry->set_irreducible_entry(true); |
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753 } |
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754 bool is_irreducible() const { return _irreducible; } |
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755 |
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756 bool is_root() const { return _tail->pre_order() == max_jint; } |
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757 |
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758 void print(outputStream* st = tty, int indent = 0) const PRODUCT_RETURN; |
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759 }; |
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760 |
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761 // Postorder iteration over the loop tree. |
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762 class PostorderLoops : public StackObj { |
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763 private: |
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764 Loop* _root; |
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765 Loop* _current; |
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766 public: |
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767 PostorderLoops(Loop* root) : _root(root), _current(root) { |
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768 while (_current->child() != NULL) { |
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769 _current = _current->child(); |
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770 } |
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771 } |
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772 bool done() { return _current == NULL; } // Finished iterating? |
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773 void next(); // Advance to next loop |
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774 Loop* current() { return _current; } // Return current loop. |
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775 }; |
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776 |
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777 // Preorder iteration over the loop tree. |
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778 class PreorderLoops : public StackObj { |
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779 private: |
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780 Loop* _root; |
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781 Loop* _current; |
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782 public: |
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783 PreorderLoops(Loop* root) : _root(root), _current(root) {} |
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784 bool done() { return _current == NULL; } // Finished iterating? |
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785 void next(); // Advance to next loop |
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786 Loop* current() { return _current; } // Return current loop. |
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787 }; |
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788 |
0 | 789 // Standard indexes of successors, for various bytecodes. |
790 enum { | |
791 FALL_THROUGH = 0, // normal control | |
792 IF_NOT_TAKEN = 0, // the not-taken branch of an if (i.e., fall-through) | |
793 IF_TAKEN = 1, // the taken branch of an if | |
794 GOTO_TARGET = 0, // unique successor for goto, jsr, or ret | |
795 SWITCH_DEFAULT = 0, // default branch of a switch | |
796 SWITCH_CASES = 1 // first index for any non-default switch branches | |
797 // Unlike in other blocks, the successors of a switch are listed uniquely. | |
798 }; | |
799 | |
800 private: | |
801 // A mapping from pre_order to Blocks. This array is created | |
802 // only at the end of the flow. | |
803 Block** _block_map; | |
804 | |
805 // For each ciBlock index, a list of Blocks which share this ciBlock. | |
806 GrowableArray<Block*>** _idx_to_blocklist; | |
807 // count of ciBlocks | |
808 int _ciblock_count; | |
809 | |
810 // Tells if a given instruction is able to generate an exception edge. | |
811 bool can_trap(ciBytecodeStream& str); | |
812 | |
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813 // Clone the loop heads. Returns true if any cloning occurred. |
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814 bool clone_loop_heads(Loop* lp, StateVector* temp_vector, JsrSet* temp_set); |
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815 |
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816 // Clone lp's head and replace tail's successors with clone. |
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817 Block* clone_loop_head(Loop* lp, StateVector* temp_vector, JsrSet* temp_set); |
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818 |
0 | 819 public: |
820 // Return the block beginning at bci which has a JsrSet compatible | |
821 // with jsrs. | |
822 Block* block_at(int bci, JsrSet* set, CreateOption option = create_public_copy); | |
823 | |
824 // block factory | |
825 Block* get_block_for(int ciBlockIndex, JsrSet* jsrs, CreateOption option = create_public_copy); | |
826 | |
367
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827 // How many of the blocks have the backedge_copy bit set? |
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828 int backedge_copy_count(int ciBlockIndex, JsrSet* jsrs) const; |
0 | 829 |
830 // Return an existing block containing bci which has a JsrSet compatible | |
831 // with jsrs, or NULL if there is none. | |
832 Block* existing_block_at(int bci, JsrSet* set) { return block_at(bci, set, no_create); } | |
833 | |
834 // Tell whether the flow analysis has encountered an error of some sort. | |
835 bool failing() { return env()->failing() || _failure_reason != NULL; } | |
836 | |
837 // Reason this compilation is failing, such as "too many basic blocks". | |
838 const char* failure_reason() { return _failure_reason; } | |
839 | |
840 // Note a failure. | |
841 void record_failure(const char* reason); | |
842 | |
843 // Return the block of a given pre-order number. | |
844 int have_block_count() const { return _block_map != NULL; } | |
845 int block_count() const { assert(have_block_count(), ""); | |
846 return _next_pre_order; } | |
847 Block* pre_order_at(int po) const { assert(0 <= po && po < block_count(), "out of bounds"); | |
848 return _block_map[po]; } | |
849 Block* start_block() const { return pre_order_at(start_block_num()); } | |
850 int start_block_num() const { return 0; } | |
367
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851 Block* rpo_at(int rpo) const { assert(0 <= rpo && rpo < block_count(), "out of bounds"); |
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852 return _block_map[rpo]; } |
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853 int next_pre_order() { return _next_pre_order; } |
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854 int inc_next_pre_order() { return _next_pre_order++; } |
0 | 855 |
856 private: | |
857 // A work list used during flow analysis. | |
858 Block* _work_list; | |
859 | |
367
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860 // List of blocks in reverse post order |
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861 Block* _rpo_list; |
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862 |
0 | 863 // Next Block::_pre_order. After mapping, doubles as block_count. |
864 int _next_pre_order; | |
865 | |
866 // Are there more blocks on the work list? | |
867 bool work_list_empty() { return _work_list == NULL; } | |
868 | |
869 // Get the next basic block from our work list. | |
870 Block* work_list_next(); | |
871 | |
872 // Add a basic block to our work list. | |
873 void add_to_work_list(Block* block); | |
874 | |
367
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875 // Prepend a basic block to rpo list. |
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876 void prepend_to_rpo_list(Block* blk) { |
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877 blk->set_rpo_next(_rpo_list); |
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878 _rpo_list = blk; |
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879 } |
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880 |
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881 // Root of the loop tree |
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882 Loop* _loop_tree_root; |
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883 |
0 | 884 // State used for make_jsr_record |
885 int _jsr_count; | |
886 GrowableArray<JsrRecord*>* _jsr_records; | |
887 | |
888 public: | |
889 // Make a JsrRecord for a given (entry, return) pair, if such a record | |
890 // does not already exist. | |
891 JsrRecord* make_jsr_record(int entry_address, int return_address); | |
892 | |
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893 void set_loop_tree_root(Loop* ltr) { _loop_tree_root = ltr; } |
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894 Loop* loop_tree_root() { return _loop_tree_root; } |
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895 |
0 | 896 private: |
897 // Get the initial state for start_bci: | |
898 const StateVector* get_start_state(); | |
899 | |
900 // Merge the current state into all exceptional successors at the | |
901 // current point in the code. | |
902 void flow_exceptions(GrowableArray<Block*>* exceptions, | |
903 GrowableArray<ciInstanceKlass*>* exc_klasses, | |
904 StateVector* state); | |
905 | |
906 // Merge the current state into all successors at the current point | |
907 // in the code. | |
908 void flow_successors(GrowableArray<Block*>* successors, | |
909 StateVector* state); | |
910 | |
911 // Interpret the effects of the bytecodes on the incoming state | |
912 // vector of a basic block. Push the changed state to succeeding | |
913 // basic blocks. | |
914 void flow_block(Block* block, | |
915 StateVector* scratch_state, | |
916 JsrSet* scratch_jsrs); | |
917 | |
918 // Perform the type flow analysis, creating and cloning Blocks as | |
919 // necessary. | |
920 void flow_types(); | |
921 | |
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922 // Perform the depth first type flow analysis. Helper for flow_types. |
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923 void df_flow_types(Block* start, |
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924 bool do_flow, |
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925 StateVector* temp_vector, |
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926 JsrSet* temp_set); |
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927 |
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928 // Incrementally build loop tree. |
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929 void build_loop_tree(Block* blk); |
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930 |
0 | 931 // Create the block map, which indexes blocks in pre_order. |
932 void map_blocks(); | |
933 | |
934 public: | |
935 // Perform type inference flow analysis. | |
936 void do_flow(); | |
937 | |
938 void print_on(outputStream* st) const PRODUCT_RETURN; | |
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939 |
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940 void rpo_print_on(outputStream* st) const PRODUCT_RETURN; |
0 | 941 }; |
1972 | 942 |
943 #endif // SHARE_VM_CI_CITYPEFLOW_HPP |