Mercurial > hg > graal-compiler
annotate src/share/vm/ci/ciTypeFlow.hpp @ 1782:f353275af40e
6981773: incorrect fill value with OptimizeFill
Reviewed-by: kvn, twisti
author | never |
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date | Thu, 02 Sep 2010 11:40:02 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 | |
26 class ciTypeFlow : public ResourceObj { | |
27 private: | |
28 ciEnv* _env; | |
29 ciMethod* _method; | |
30 ciMethodBlocks* _methodBlocks; | |
31 int _osr_bci; | |
32 | |
33 // information cached from the method: | |
34 int _max_locals; | |
35 int _max_stack; | |
36 int _code_size; | |
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37 bool _has_irreducible_entry; |
0 | 38 |
39 const char* _failure_reason; | |
40 | |
41 public: | |
42 class StateVector; | |
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43 class Loop; |
0 | 44 class Block; |
45 | |
46 // Build a type flow analyzer | |
47 // Do an OSR analysis if osr_bci >= 0. | |
48 ciTypeFlow(ciEnv* env, ciMethod* method, int osr_bci = InvocationEntryBci); | |
49 | |
50 // Accessors | |
51 ciMethod* method() const { return _method; } | |
52 ciEnv* env() { return _env; } | |
53 Arena* arena() { return _env->arena(); } | |
54 bool is_osr_flow() const{ return _osr_bci != InvocationEntryBci; } | |
55 int start_bci() const { return is_osr_flow()? _osr_bci: 0; } | |
56 int max_locals() const { return _max_locals; } | |
57 int max_stack() const { return _max_stack; } | |
58 int max_cells() const { return _max_locals + _max_stack; } | |
59 int code_size() const { return _code_size; } | |
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60 bool has_irreducible_entry() const { return _has_irreducible_entry; } |
0 | 61 |
62 // Represents information about an "active" jsr call. This | |
63 // class represents a call to the routine at some entry address | |
64 // with some distinct return address. | |
65 class JsrRecord : public ResourceObj { | |
66 private: | |
67 int _entry_address; | |
68 int _return_address; | |
69 public: | |
70 JsrRecord(int entry_address, int return_address) { | |
71 _entry_address = entry_address; | |
72 _return_address = return_address; | |
73 } | |
74 | |
75 int entry_address() const { return _entry_address; } | |
76 int return_address() const { return _return_address; } | |
77 | |
78 void print_on(outputStream* st) const { | |
79 #ifndef PRODUCT | |
80 st->print("%d->%d", entry_address(), return_address()); | |
81 #endif | |
82 } | |
83 }; | |
84 | |
85 // A JsrSet represents some set of JsrRecords. This class | |
86 // is used to record a set of all jsr routines which we permit | |
87 // execution to return (ret) from. | |
88 // | |
89 // During abstract interpretation, JsrSets are used to determine | |
90 // whether two paths which reach a given block are unique, and | |
91 // should be cloned apart, or are compatible, and should merge | |
92 // together. | |
93 // | |
94 // Note that different amounts of effort can be expended determining | |
95 // if paths are compatible. <DISCUSSION> | |
96 class JsrSet : public ResourceObj { | |
97 private: | |
98 GrowableArray<JsrRecord*>* _set; | |
99 | |
100 JsrRecord* record_at(int i) { | |
101 return _set->at(i); | |
102 } | |
103 | |
104 // Insert the given JsrRecord into the JsrSet, maintaining the order | |
105 // of the set and replacing any element with the same entry address. | |
106 void insert_jsr_record(JsrRecord* record); | |
107 | |
108 // Remove the JsrRecord with the given return address from the JsrSet. | |
109 void remove_jsr_record(int return_address); | |
110 | |
111 public: | |
112 JsrSet(Arena* arena, int default_len = 4); | |
113 | |
114 // Copy this JsrSet. | |
115 void copy_into(JsrSet* jsrs); | |
116 | |
117 // Is this JsrSet compatible with some other JsrSet? | |
118 bool is_compatible_with(JsrSet* other); | |
119 | |
120 // Apply the effect of a single bytecode to the JsrSet. | |
121 void apply_control(ciTypeFlow* analyzer, | |
122 ciBytecodeStream* str, | |
123 StateVector* state); | |
124 | |
125 // What is the cardinality of this set? | |
126 int size() const { return _set->length(); } | |
127 | |
128 void print_on(outputStream* st) const PRODUCT_RETURN; | |
129 }; | |
130 | |
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131 class LocalSet VALUE_OBJ_CLASS_SPEC { |
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132 private: |
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133 enum Constants { max = 63 }; |
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134 uint64_t _bits; |
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135 public: |
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136 LocalSet() : _bits(0) {} |
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137 void add(uint32_t i) { if (i < (uint32_t)max) _bits |= (1LL << i); } |
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138 void add(LocalSet* ls) { _bits |= ls->_bits; } |
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139 bool test(uint32_t i) const { return i < (uint32_t)max ? (_bits>>i)&1U : true; } |
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140 void clear() { _bits = 0; } |
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141 void print_on(outputStream* st, int limit) const PRODUCT_RETURN; |
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142 }; |
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143 |
0 | 144 // Used as a combined index for locals and temps |
145 enum Cell { | |
303 | 146 Cell_0, Cell_max = INT_MAX |
0 | 147 }; |
148 | |
149 // A StateVector summarizes the type information at some | |
150 // point in the program | |
151 class StateVector : public ResourceObj { | |
152 private: | |
153 ciType** _types; | |
154 int _stack_size; | |
155 int _monitor_count; | |
156 ciTypeFlow* _outer; | |
157 | |
158 int _trap_bci; | |
159 int _trap_index; | |
160 | |
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161 LocalSet _def_locals; // For entire block |
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162 |
0 | 163 static ciType* type_meet_internal(ciType* t1, ciType* t2, ciTypeFlow* analyzer); |
164 | |
165 public: | |
166 // Special elements in our type lattice. | |
167 enum { | |
168 T_TOP = T_VOID, // why not? | |
169 T_BOTTOM = T_CONFLICT, | |
170 T_LONG2 = T_SHORT, // 2nd word of T_LONG | |
171 T_DOUBLE2 = T_CHAR, // 2nd word of T_DOUBLE | |
172 T_NULL = T_BYTE // for now. | |
173 }; | |
174 static ciType* top_type() { return ciType::make((BasicType)T_TOP); } | |
175 static ciType* bottom_type() { return ciType::make((BasicType)T_BOTTOM); } | |
176 static ciType* long2_type() { return ciType::make((BasicType)T_LONG2); } | |
177 static ciType* double2_type(){ return ciType::make((BasicType)T_DOUBLE2); } | |
178 static ciType* null_type() { return ciType::make((BasicType)T_NULL); } | |
179 | |
180 static ciType* half_type(ciType* t) { | |
181 switch (t->basic_type()) { | |
182 case T_LONG: return long2_type(); | |
183 case T_DOUBLE: return double2_type(); | |
184 default: ShouldNotReachHere(); return NULL; | |
185 } | |
186 } | |
187 | |
188 // The meet operation for our type lattice. | |
189 ciType* type_meet(ciType* t1, ciType* t2) { | |
190 return type_meet_internal(t1, t2, outer()); | |
191 } | |
192 | |
193 // Accessors | |
194 ciTypeFlow* outer() const { return _outer; } | |
195 | |
196 int stack_size() const { return _stack_size; } | |
197 void set_stack_size(int ss) { _stack_size = ss; } | |
198 | |
199 int monitor_count() const { return _monitor_count; } | |
200 void set_monitor_count(int mc) { _monitor_count = mc; } | |
201 | |
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202 LocalSet* def_locals() { return &_def_locals; } |
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203 const LocalSet* def_locals() const { return &_def_locals; } |
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204 |
0 | 205 static Cell start_cell() { return (Cell)0; } |
206 static Cell next_cell(Cell c) { return (Cell)(((int)c) + 1); } | |
207 Cell limit_cell() const { | |
208 return (Cell)(outer()->max_locals() + stack_size()); | |
209 } | |
210 | |
211 // Cell creation | |
212 Cell local(int lnum) const { | |
213 assert(lnum < outer()->max_locals(), "index check"); | |
214 return (Cell)(lnum); | |
215 } | |
216 | |
217 Cell stack(int snum) const { | |
218 assert(snum < stack_size(), "index check"); | |
219 return (Cell)(outer()->max_locals() + snum); | |
220 } | |
221 | |
222 Cell tos() const { return stack(stack_size()-1); } | |
223 | |
224 // For external use only: | |
225 ciType* local_type_at(int i) const { return type_at(local(i)); } | |
226 ciType* stack_type_at(int i) const { return type_at(stack(i)); } | |
227 | |
228 // Accessors for the type of some Cell c | |
229 ciType* type_at(Cell c) const { | |
230 assert(start_cell() <= c && c < limit_cell(), "out of bounds"); | |
231 return _types[c]; | |
232 } | |
233 | |
234 void set_type_at(Cell c, ciType* type) { | |
235 assert(start_cell() <= c && c < limit_cell(), "out of bounds"); | |
236 _types[c] = type; | |
237 } | |
238 | |
239 // Top-of-stack operations. | |
240 void set_type_at_tos(ciType* type) { set_type_at(tos(), type); } | |
241 ciType* type_at_tos() const { return type_at(tos()); } | |
242 | |
243 void push(ciType* type) { | |
244 _stack_size++; | |
245 set_type_at_tos(type); | |
246 } | |
247 void pop() { | |
248 debug_only(set_type_at_tos(bottom_type())); | |
249 _stack_size--; | |
250 } | |
251 ciType* pop_value() { | |
252 ciType* t = type_at_tos(); | |
253 pop(); | |
254 return t; | |
255 } | |
256 | |
257 // Convenience operations. | |
258 bool is_reference(ciType* type) const { | |
259 return type == null_type() || !type->is_primitive_type(); | |
260 } | |
261 bool is_int(ciType* type) const { | |
262 return type->basic_type() == T_INT; | |
263 } | |
264 bool is_long(ciType* type) const { | |
265 return type->basic_type() == T_LONG; | |
266 } | |
267 bool is_float(ciType* type) const { | |
268 return type->basic_type() == T_FLOAT; | |
269 } | |
270 bool is_double(ciType* type) const { | |
271 return type->basic_type() == T_DOUBLE; | |
272 } | |
273 | |
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274 void store_to_local(int lnum) { |
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275 _def_locals.add((uint) lnum); |
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276 } |
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277 |
0 | 278 void push_translate(ciType* type); |
279 | |
280 void push_int() { | |
281 push(ciType::make(T_INT)); | |
282 } | |
283 void pop_int() { | |
284 assert(is_int(type_at_tos()), "must be integer"); | |
285 pop(); | |
286 } | |
287 void check_int(Cell c) { | |
288 assert(is_int(type_at(c)), "must be integer"); | |
289 } | |
290 void push_double() { | |
291 push(ciType::make(T_DOUBLE)); | |
292 push(double2_type()); | |
293 } | |
294 void pop_double() { | |
295 assert(type_at_tos() == double2_type(), "must be 2nd half"); | |
296 pop(); | |
297 assert(is_double(type_at_tos()), "must be double"); | |
298 pop(); | |
299 } | |
300 void push_float() { | |
301 push(ciType::make(T_FLOAT)); | |
302 } | |
303 void pop_float() { | |
304 assert(is_float(type_at_tos()), "must be float"); | |
305 pop(); | |
306 } | |
307 void push_long() { | |
308 push(ciType::make(T_LONG)); | |
309 push(long2_type()); | |
310 } | |
311 void pop_long() { | |
312 assert(type_at_tos() == long2_type(), "must be 2nd half"); | |
313 pop(); | |
314 assert(is_long(type_at_tos()), "must be long"); | |
315 pop(); | |
316 } | |
317 void push_object(ciKlass* klass) { | |
318 push(klass); | |
319 } | |
320 void pop_object() { | |
321 assert(is_reference(type_at_tos()), "must be reference type"); | |
322 pop(); | |
323 } | |
324 void pop_array() { | |
325 assert(type_at_tos() == null_type() || | |
326 type_at_tos()->is_array_klass(), "must be array type"); | |
327 pop(); | |
328 } | |
329 // pop_objArray and pop_typeArray narrow the tos to ciObjArrayKlass | |
330 // or ciTypeArrayKlass (resp.). In the rare case that an explicit | |
331 // null is popped from the stack, we return NULL. Caller beware. | |
332 ciObjArrayKlass* pop_objArray() { | |
333 ciType* array = pop_value(); | |
334 if (array == null_type()) return NULL; | |
335 assert(array->is_obj_array_klass(), "must be object array type"); | |
336 return array->as_obj_array_klass(); | |
337 } | |
338 ciTypeArrayKlass* pop_typeArray() { | |
339 ciType* array = pop_value(); | |
340 if (array == null_type()) return NULL; | |
341 assert(array->is_type_array_klass(), "must be prim array type"); | |
342 return array->as_type_array_klass(); | |
343 } | |
344 void push_null() { | |
345 push(null_type()); | |
346 } | |
347 void do_null_assert(ciKlass* unloaded_klass); | |
348 | |
349 // Helper convenience routines. | |
350 void do_aaload(ciBytecodeStream* str); | |
351 void do_checkcast(ciBytecodeStream* str); | |
352 void do_getfield(ciBytecodeStream* str); | |
353 void do_getstatic(ciBytecodeStream* str); | |
354 void do_invoke(ciBytecodeStream* str, bool has_receiver); | |
355 void do_jsr(ciBytecodeStream* str); | |
356 void do_ldc(ciBytecodeStream* str); | |
357 void do_multianewarray(ciBytecodeStream* str); | |
358 void do_new(ciBytecodeStream* str); | |
359 void do_newarray(ciBytecodeStream* str); | |
360 void do_putfield(ciBytecodeStream* str); | |
361 void do_putstatic(ciBytecodeStream* str); | |
362 void do_ret(ciBytecodeStream* str); | |
363 | |
364 void overwrite_local_double_long(int index) { | |
365 // Invalidate the previous local if it contains first half of | |
366 // a double or long value since it's seconf half is being overwritten. | |
367 int prev_index = index - 1; | |
368 if (prev_index >= 0 && | |
369 (is_double(type_at(local(prev_index))) || | |
370 is_long(type_at(local(prev_index))))) { | |
371 set_type_at(local(prev_index), bottom_type()); | |
372 } | |
373 } | |
374 | |
375 void load_local_object(int index) { | |
376 ciType* type = type_at(local(index)); | |
377 assert(is_reference(type), "must be reference type"); | |
378 push(type); | |
379 } | |
380 void store_local_object(int index) { | |
381 ciType* type = pop_value(); | |
382 assert(is_reference(type) || type->is_return_address(), | |
383 "must be reference type or return address"); | |
384 overwrite_local_double_long(index); | |
385 set_type_at(local(index), type); | |
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386 store_to_local(index); |
0 | 387 } |
388 | |
389 void load_local_double(int index) { | |
390 ciType* type = type_at(local(index)); | |
391 ciType* type2 = type_at(local(index+1)); | |
392 assert(is_double(type), "must be double type"); | |
393 assert(type2 == double2_type(), "must be 2nd half"); | |
394 push(type); | |
395 push(double2_type()); | |
396 } | |
397 void store_local_double(int index) { | |
398 ciType* type2 = pop_value(); | |
399 ciType* type = pop_value(); | |
400 assert(is_double(type), "must be double"); | |
401 assert(type2 == double2_type(), "must be 2nd half"); | |
402 overwrite_local_double_long(index); | |
403 set_type_at(local(index), type); | |
404 set_type_at(local(index+1), type2); | |
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405 store_to_local(index); |
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406 store_to_local(index+1); |
0 | 407 } |
408 | |
409 void load_local_float(int index) { | |
410 ciType* type = type_at(local(index)); | |
411 assert(is_float(type), "must be float type"); | |
412 push(type); | |
413 } | |
414 void store_local_float(int index) { | |
415 ciType* type = pop_value(); | |
416 assert(is_float(type), "must be float type"); | |
417 overwrite_local_double_long(index); | |
418 set_type_at(local(index), type); | |
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419 store_to_local(index); |
0 | 420 } |
421 | |
422 void load_local_int(int index) { | |
423 ciType* type = type_at(local(index)); | |
424 assert(is_int(type), "must be int type"); | |
425 push(type); | |
426 } | |
427 void store_local_int(int index) { | |
428 ciType* type = pop_value(); | |
429 assert(is_int(type), "must be int type"); | |
430 overwrite_local_double_long(index); | |
431 set_type_at(local(index), type); | |
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432 store_to_local(index); |
0 | 433 } |
434 | |
435 void load_local_long(int index) { | |
436 ciType* type = type_at(local(index)); | |
437 ciType* type2 = type_at(local(index+1)); | |
438 assert(is_long(type), "must be long type"); | |
439 assert(type2 == long2_type(), "must be 2nd half"); | |
440 push(type); | |
441 push(long2_type()); | |
442 } | |
443 void store_local_long(int index) { | |
444 ciType* type2 = pop_value(); | |
445 ciType* type = pop_value(); | |
446 assert(is_long(type), "must be long"); | |
447 assert(type2 == long2_type(), "must be 2nd half"); | |
448 overwrite_local_double_long(index); | |
449 set_type_at(local(index), type); | |
450 set_type_at(local(index+1), type2); | |
367
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451 store_to_local(index); |
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452 store_to_local(index+1); |
0 | 453 } |
454 | |
455 // Stop interpretation of this path with a trap. | |
456 void trap(ciBytecodeStream* str, ciKlass* klass, int index); | |
457 | |
458 public: | |
459 StateVector(ciTypeFlow* outer); | |
460 | |
461 // Copy our value into some other StateVector | |
462 void copy_into(StateVector* copy) const; | |
463 | |
464 // Meets this StateVector with another, destructively modifying this | |
465 // one. Returns true if any modification takes place. | |
466 bool meet(const StateVector* incoming); | |
467 | |
468 // Ditto, except that the incoming state is coming from an exception. | |
469 bool meet_exception(ciInstanceKlass* exc, const StateVector* incoming); | |
470 | |
471 // Apply the effect of one bytecode to this StateVector | |
472 bool apply_one_bytecode(ciBytecodeStream* stream); | |
473 | |
474 // What is the bci of the trap? | |
475 int trap_bci() { return _trap_bci; } | |
476 | |
477 // What is the index associated with the trap? | |
478 int trap_index() { return _trap_index; } | |
479 | |
480 void print_cell_on(outputStream* st, Cell c) const PRODUCT_RETURN; | |
481 void print_on(outputStream* st) const PRODUCT_RETURN; | |
482 }; | |
483 | |
484 // Parameter for "find_block" calls: | |
367
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485 // Describes the difference between a public and backedge copy. |
0 | 486 enum CreateOption { |
487 create_public_copy, | |
367
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488 create_backedge_copy, |
0 | 489 no_create |
490 }; | |
491 | |
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492 // Successor iterator |
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493 class SuccIter : public StackObj { |
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494 private: |
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495 Block* _pred; |
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496 int _index; |
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497 Block* _succ; |
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498 public: |
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499 SuccIter() : _pred(NULL), _index(-1), _succ(NULL) {} |
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500 SuccIter(Block* pred) : _pred(pred), _index(-1), _succ(NULL) { next(); } |
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501 int index() { return _index; } |
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502 Block* pred() { return _pred; } // Return predecessor |
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503 bool done() { return _index < 0; } // Finished? |
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504 Block* succ() { return _succ; } // Return current successor |
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505 void next(); // Advance |
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506 void set_succ(Block* succ); // Update current successor |
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507 bool is_normal_ctrl() { return index() < _pred->successors()->length(); } |
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508 }; |
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509 |
0 | 510 // A basic block |
511 class Block : public ResourceObj { | |
512 private: | |
513 ciBlock* _ciblock; | |
514 GrowableArray<Block*>* _exceptions; | |
515 GrowableArray<ciInstanceKlass*>* _exc_klasses; | |
516 GrowableArray<Block*>* _successors; | |
517 StateVector* _state; | |
518 JsrSet* _jsrs; | |
519 | |
520 int _trap_bci; | |
521 int _trap_index; | |
522 | |
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523 // pre_order, assigned at first visit. Used as block ID and "visited" tag |
0 | 524 int _pre_order; |
525 | |
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526 // A post-order, used to compute the reverse post order (RPO) provided to the client |
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527 int _post_order; // used to compute rpo |
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528 |
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529 // Has this block been cloned for a loop backedge? |
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530 bool _backedge_copy; |
0 | 531 |
532 // A pointer used for our internal work list | |
367
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533 Block* _next; |
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534 bool _on_work_list; // on the work list |
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535 Block* _rpo_next; // Reverse post order list |
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536 |
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537 // Loop info |
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538 Loop* _loop; // nearest loop |
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539 bool _irreducible_entry; // entry to irreducible loop |
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540 bool _exception_entry; // entry to exception handler |
0 | 541 |
542 ciBlock* ciblock() const { return _ciblock; } | |
543 StateVector* state() const { return _state; } | |
544 | |
545 // Compute the exceptional successors and types for this Block. | |
546 void compute_exceptions(); | |
547 | |
548 public: | |
549 // constructors | |
550 Block(ciTypeFlow* outer, ciBlock* ciblk, JsrSet* jsrs); | |
551 | |
552 void set_trap(int trap_bci, int trap_index) { | |
553 _trap_bci = trap_bci; | |
554 _trap_index = trap_index; | |
555 assert(has_trap(), ""); | |
556 } | |
557 bool has_trap() const { return _trap_bci != -1; } | |
558 int trap_bci() const { assert(has_trap(), ""); return _trap_bci; } | |
559 int trap_index() const { assert(has_trap(), ""); return _trap_index; } | |
560 | |
561 // accessors | |
562 ciTypeFlow* outer() const { return state()->outer(); } | |
563 int start() const { return _ciblock->start_bci(); } | |
564 int limit() const { return _ciblock->limit_bci(); } | |
565 int control() const { return _ciblock->control_bci(); } | |
367
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566 JsrSet* jsrs() const { return _jsrs; } |
0 | 567 |
367
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568 bool is_backedge_copy() const { return _backedge_copy; } |
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569 void set_backedge_copy(bool z); |
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570 int backedge_copy_count() const { return outer()->backedge_copy_count(ciblock()->index(), _jsrs); } |
0 | 571 |
572 // access to entry state | |
573 int stack_size() const { return _state->stack_size(); } | |
574 int monitor_count() const { return _state->monitor_count(); } | |
575 ciType* local_type_at(int i) const { return _state->local_type_at(i); } | |
576 ciType* stack_type_at(int i) const { return _state->stack_type_at(i); } | |
577 | |
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578 // Data flow on locals |
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579 bool is_invariant_local(uint v) const { |
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580 assert(is_loop_head(), "only loop heads"); |
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581 // Find outermost loop with same loop head |
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582 Loop* lp = loop(); |
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583 while (lp->parent() != NULL) { |
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584 if (lp->parent()->head() != lp->head()) break; |
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585 lp = lp->parent(); |
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586 } |
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587 return !lp->def_locals()->test(v); |
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588 } |
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589 LocalSet* def_locals() { return _state->def_locals(); } |
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590 const LocalSet* def_locals() const { return _state->def_locals(); } |
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591 |
0 | 592 // Get the successors for this Block. |
593 GrowableArray<Block*>* successors(ciBytecodeStream* str, | |
594 StateVector* state, | |
595 JsrSet* jsrs); | |
596 GrowableArray<Block*>* successors() { | |
597 assert(_successors != NULL, "must be filled in"); | |
598 return _successors; | |
599 } | |
600 | |
601 // Get the exceptional successors for this Block. | |
602 GrowableArray<Block*>* exceptions() { | |
603 if (_exceptions == NULL) { | |
604 compute_exceptions(); | |
605 } | |
606 return _exceptions; | |
607 } | |
608 | |
609 // Get the exception klasses corresponding to the | |
610 // exceptional successors for this Block. | |
611 GrowableArray<ciInstanceKlass*>* exc_klasses() { | |
612 if (_exc_klasses == NULL) { | |
613 compute_exceptions(); | |
614 } | |
615 return _exc_klasses; | |
616 } | |
617 | |
618 // Is this Block compatible with a given JsrSet? | |
619 bool is_compatible_with(JsrSet* other) { | |
620 return _jsrs->is_compatible_with(other); | |
621 } | |
622 | |
623 // Copy the value of our state vector into another. | |
624 void copy_state_into(StateVector* copy) const { | |
625 _state->copy_into(copy); | |
626 } | |
627 | |
628 // Copy the value of our JsrSet into another | |
629 void copy_jsrs_into(JsrSet* copy) const { | |
630 _jsrs->copy_into(copy); | |
631 } | |
632 | |
633 // Meets the start state of this block with another state, destructively | |
634 // modifying this one. Returns true if any modification takes place. | |
635 bool meet(const StateVector* incoming) { | |
636 return state()->meet(incoming); | |
637 } | |
638 | |
639 // Ditto, except that the incoming state is coming from an | |
640 // exception path. This means the stack is replaced by the | |
641 // appropriate exception type. | |
642 bool meet_exception(ciInstanceKlass* exc, const StateVector* incoming) { | |
643 return state()->meet_exception(exc, incoming); | |
644 } | |
645 | |
646 // Work list manipulation | |
647 void set_next(Block* block) { _next = block; } | |
648 Block* next() const { return _next; } | |
649 | |
650 void set_on_work_list(bool c) { _on_work_list = c; } | |
651 bool is_on_work_list() const { return _on_work_list; } | |
652 | |
653 bool has_pre_order() const { return _pre_order >= 0; } | |
367
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654 void set_pre_order(int po) { assert(!has_pre_order(), ""); _pre_order = po; } |
0 | 655 int pre_order() const { assert(has_pre_order(), ""); return _pre_order; } |
367
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656 void set_next_pre_order() { set_pre_order(outer()->inc_next_pre_order()); } |
0 | 657 bool is_start() const { return _pre_order == outer()->start_block_num(); } |
658 | |
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659 // Reverse post order |
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660 void df_init(); |
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661 bool has_post_order() const { return _post_order >= 0; } |
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662 void set_post_order(int po) { assert(!has_post_order() && po >= 0, ""); _post_order = po; } |
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663 void reset_post_order(int o){ _post_order = o; } |
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664 int post_order() const { assert(has_post_order(), ""); return _post_order; } |
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665 |
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666 bool has_rpo() const { return has_post_order() && outer()->have_block_count(); } |
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667 int rpo() const { assert(has_rpo(), ""); return outer()->block_count() - post_order() - 1; } |
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668 void set_rpo_next(Block* b) { _rpo_next = b; } |
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669 Block* rpo_next() { return _rpo_next; } |
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670 |
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671 // Loops |
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672 Loop* loop() const { return _loop; } |
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673 void set_loop(Loop* lp) { _loop = lp; } |
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674 bool is_loop_head() const { return _loop && _loop->head() == this; } |
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675 void set_irreducible_entry(bool c) { _irreducible_entry = c; } |
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676 bool is_irreducible_entry() const { return _irreducible_entry; } |
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677 bool is_visited() const { return has_pre_order(); } |
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678 bool is_post_visited() const { return has_post_order(); } |
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679 bool is_clonable_exit(Loop* lp); |
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680 Block* looping_succ(Loop* lp); // Successor inside of loop |
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681 bool is_single_entry_loop_head() const { |
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682 if (!is_loop_head()) return false; |
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683 for (Loop* lp = loop(); lp != NULL && lp->head() == this; lp = lp->parent()) |
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684 if (lp->is_irreducible()) return false; |
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685 return true; |
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686 } |
0 | 687 |
688 void print_value_on(outputStream* st) const PRODUCT_RETURN; | |
689 void print_on(outputStream* st) const PRODUCT_RETURN; | |
690 }; | |
691 | |
367
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692 // Loop |
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693 class Loop : public ResourceObj { |
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694 private: |
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695 Loop* _parent; |
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696 Loop* _sibling; // List of siblings, null terminated |
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697 Loop* _child; // Head of child list threaded thru sibling pointer |
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698 Block* _head; // Head of loop |
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699 Block* _tail; // Tail of loop |
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700 bool _irreducible; |
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701 LocalSet _def_locals; |
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702 |
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703 public: |
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704 Loop(Block* head, Block* tail) : |
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705 _head(head), _tail(tail), |
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706 _parent(NULL), _sibling(NULL), _child(NULL), |
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707 _irreducible(false), _def_locals() {} |
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708 |
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709 Loop* parent() const { return _parent; } |
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710 Loop* sibling() const { return _sibling; } |
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711 Loop* child() const { return _child; } |
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712 Block* head() const { return _head; } |
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713 Block* tail() const { return _tail; } |
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714 void set_parent(Loop* p) { _parent = p; } |
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715 void set_sibling(Loop* s) { _sibling = s; } |
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716 void set_child(Loop* c) { _child = c; } |
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717 void set_head(Block* hd) { _head = hd; } |
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718 void set_tail(Block* tl) { _tail = tl; } |
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719 |
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720 int depth() const; // nesting depth |
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721 |
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722 // Returns true if lp is a nested loop or us. |
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723 bool contains(Loop* lp) const; |
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724 bool contains(Block* blk) const { return contains(blk->loop()); } |
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725 |
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726 // Data flow on locals |
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727 LocalSet* def_locals() { return &_def_locals; } |
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728 const LocalSet* def_locals() const { return &_def_locals; } |
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729 |
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730 // Merge the branch lp into this branch, sorting on the loop head |
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731 // pre_orders. Returns the new branch. |
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732 Loop* sorted_merge(Loop* lp); |
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733 |
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734 // Mark non-single entry to loop |
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735 void set_irreducible(Block* entry) { |
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736 _irreducible = true; |
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737 entry->set_irreducible_entry(true); |
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738 } |
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739 bool is_irreducible() const { return _irreducible; } |
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740 |
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741 bool is_root() const { return _tail->pre_order() == max_jint; } |
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742 |
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743 void print(outputStream* st = tty, int indent = 0) const PRODUCT_RETURN; |
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744 }; |
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745 |
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746 // Postorder iteration over the loop tree. |
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747 class PostorderLoops : public StackObj { |
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748 private: |
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749 Loop* _root; |
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750 Loop* _current; |
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751 public: |
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752 PostorderLoops(Loop* root) : _root(root), _current(root) { |
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753 while (_current->child() != NULL) { |
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754 _current = _current->child(); |
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755 } |
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756 } |
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757 bool done() { return _current == NULL; } // Finished iterating? |
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758 void next(); // Advance to next loop |
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759 Loop* current() { return _current; } // Return current loop. |
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760 }; |
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761 |
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762 // Preorder iteration over the loop tree. |
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763 class PreorderLoops : public StackObj { |
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764 private: |
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765 Loop* _root; |
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766 Loop* _current; |
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767 public: |
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768 PreorderLoops(Loop* root) : _root(root), _current(root) {} |
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769 bool done() { return _current == NULL; } // Finished iterating? |
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770 void next(); // Advance to next loop |
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771 Loop* current() { return _current; } // Return current loop. |
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772 }; |
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773 |
0 | 774 // Standard indexes of successors, for various bytecodes. |
775 enum { | |
776 FALL_THROUGH = 0, // normal control | |
777 IF_NOT_TAKEN = 0, // the not-taken branch of an if (i.e., fall-through) | |
778 IF_TAKEN = 1, // the taken branch of an if | |
779 GOTO_TARGET = 0, // unique successor for goto, jsr, or ret | |
780 SWITCH_DEFAULT = 0, // default branch of a switch | |
781 SWITCH_CASES = 1 // first index for any non-default switch branches | |
782 // Unlike in other blocks, the successors of a switch are listed uniquely. | |
783 }; | |
784 | |
785 private: | |
786 // A mapping from pre_order to Blocks. This array is created | |
787 // only at the end of the flow. | |
788 Block** _block_map; | |
789 | |
790 // For each ciBlock index, a list of Blocks which share this ciBlock. | |
791 GrowableArray<Block*>** _idx_to_blocklist; | |
792 // count of ciBlocks | |
793 int _ciblock_count; | |
794 | |
795 // Tells if a given instruction is able to generate an exception edge. | |
796 bool can_trap(ciBytecodeStream& str); | |
797 | |
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798 // Clone the loop heads. Returns true if any cloning occurred. |
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799 bool clone_loop_heads(Loop* lp, StateVector* temp_vector, JsrSet* temp_set); |
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800 |
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801 // Clone lp's head and replace tail's successors with clone. |
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802 Block* clone_loop_head(Loop* lp, StateVector* temp_vector, JsrSet* temp_set); |
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803 |
0 | 804 public: |
805 // Return the block beginning at bci which has a JsrSet compatible | |
806 // with jsrs. | |
807 Block* block_at(int bci, JsrSet* set, CreateOption option = create_public_copy); | |
808 | |
809 // block factory | |
810 Block* get_block_for(int ciBlockIndex, JsrSet* jsrs, CreateOption option = create_public_copy); | |
811 | |
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812 // How many of the blocks have the backedge_copy bit set? |
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813 int backedge_copy_count(int ciBlockIndex, JsrSet* jsrs) const; |
0 | 814 |
815 // Return an existing block containing bci which has a JsrSet compatible | |
816 // with jsrs, or NULL if there is none. | |
817 Block* existing_block_at(int bci, JsrSet* set) { return block_at(bci, set, no_create); } | |
818 | |
819 // Tell whether the flow analysis has encountered an error of some sort. | |
820 bool failing() { return env()->failing() || _failure_reason != NULL; } | |
821 | |
822 // Reason this compilation is failing, such as "too many basic blocks". | |
823 const char* failure_reason() { return _failure_reason; } | |
824 | |
825 // Note a failure. | |
826 void record_failure(const char* reason); | |
827 | |
828 // Return the block of a given pre-order number. | |
829 int have_block_count() const { return _block_map != NULL; } | |
830 int block_count() const { assert(have_block_count(), ""); | |
831 return _next_pre_order; } | |
832 Block* pre_order_at(int po) const { assert(0 <= po && po < block_count(), "out of bounds"); | |
833 return _block_map[po]; } | |
834 Block* start_block() const { return pre_order_at(start_block_num()); } | |
835 int start_block_num() const { return 0; } | |
367
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836 Block* rpo_at(int rpo) const { assert(0 <= rpo && rpo < block_count(), "out of bounds"); |
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837 return _block_map[rpo]; } |
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838 int next_pre_order() { return _next_pre_order; } |
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839 int inc_next_pre_order() { return _next_pre_order++; } |
0 | 840 |
841 private: | |
842 // A work list used during flow analysis. | |
843 Block* _work_list; | |
844 | |
367
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845 // List of blocks in reverse post order |
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846 Block* _rpo_list; |
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847 |
0 | 848 // Next Block::_pre_order. After mapping, doubles as block_count. |
849 int _next_pre_order; | |
850 | |
851 // Are there more blocks on the work list? | |
852 bool work_list_empty() { return _work_list == NULL; } | |
853 | |
854 // Get the next basic block from our work list. | |
855 Block* work_list_next(); | |
856 | |
857 // Add a basic block to our work list. | |
858 void add_to_work_list(Block* block); | |
859 | |
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860 // Prepend a basic block to rpo list. |
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861 void prepend_to_rpo_list(Block* blk) { |
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862 blk->set_rpo_next(_rpo_list); |
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863 _rpo_list = blk; |
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864 } |
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865 |
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866 // Root of the loop tree |
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867 Loop* _loop_tree_root; |
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868 |
0 | 869 // State used for make_jsr_record |
870 int _jsr_count; | |
871 GrowableArray<JsrRecord*>* _jsr_records; | |
872 | |
873 public: | |
874 // Make a JsrRecord for a given (entry, return) pair, if such a record | |
875 // does not already exist. | |
876 JsrRecord* make_jsr_record(int entry_address, int return_address); | |
877 | |
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878 void set_loop_tree_root(Loop* ltr) { _loop_tree_root = ltr; } |
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879 Loop* loop_tree_root() { return _loop_tree_root; } |
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880 |
0 | 881 private: |
882 // Get the initial state for start_bci: | |
883 const StateVector* get_start_state(); | |
884 | |
885 // Merge the current state into all exceptional successors at the | |
886 // current point in the code. | |
887 void flow_exceptions(GrowableArray<Block*>* exceptions, | |
888 GrowableArray<ciInstanceKlass*>* exc_klasses, | |
889 StateVector* state); | |
890 | |
891 // Merge the current state into all successors at the current point | |
892 // in the code. | |
893 void flow_successors(GrowableArray<Block*>* successors, | |
894 StateVector* state); | |
895 | |
896 // Interpret the effects of the bytecodes on the incoming state | |
897 // vector of a basic block. Push the changed state to succeeding | |
898 // basic blocks. | |
899 void flow_block(Block* block, | |
900 StateVector* scratch_state, | |
901 JsrSet* scratch_jsrs); | |
902 | |
903 // Perform the type flow analysis, creating and cloning Blocks as | |
904 // necessary. | |
905 void flow_types(); | |
906 | |
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907 // Perform the depth first type flow analysis. Helper for flow_types. |
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908 void df_flow_types(Block* start, |
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909 bool do_flow, |
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910 StateVector* temp_vector, |
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911 JsrSet* temp_set); |
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912 |
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913 // Incrementally build loop tree. |
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914 void build_loop_tree(Block* blk); |
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915 |
0 | 916 // Create the block map, which indexes blocks in pre_order. |
917 void map_blocks(); | |
918 | |
919 public: | |
920 // Perform type inference flow analysis. | |
921 void do_flow(); | |
922 | |
923 void print_on(outputStream* st) const PRODUCT_RETURN; | |
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924 |
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925 void rpo_print_on(outputStream* st) const PRODUCT_RETURN; |
0 | 926 }; |