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annotate src/share/vm/ci/ciTypeFlow.hpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | eb28cf662f56 |
| children | f95d63e2154a |
| rev | line source |
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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); | |
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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: | |
|
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485 // Describes the difference between a public and backedge copy. |
| 0 | 486 enum CreateOption { |
| 487 create_public_copy, | |
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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 | |
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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(); } | |
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566 JsrSet* jsrs() const { return _jsrs; } |
| 0 | 567 |
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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; } | |
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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; } |
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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 | |
|
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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; } | |
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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 | |
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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 }; |