Tue, 26 Aug 2008 15:49:40 -0700
6741642: bad enum definition in ciTypeFlow.hpp
Reviewed-by: rasbold, martin
Contributed-by: doko@ubuntu.com
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 2000-2006 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | |
duke@435 | 26 | class ciTypeFlow : public ResourceObj { |
duke@435 | 27 | private: |
duke@435 | 28 | ciEnv* _env; |
duke@435 | 29 | ciMethod* _method; |
duke@435 | 30 | ciMethodBlocks* _methodBlocks; |
duke@435 | 31 | int _osr_bci; |
duke@435 | 32 | |
duke@435 | 33 | // information cached from the method: |
duke@435 | 34 | int _max_locals; |
duke@435 | 35 | int _max_stack; |
duke@435 | 36 | int _code_size; |
duke@435 | 37 | |
duke@435 | 38 | const char* _failure_reason; |
duke@435 | 39 | |
duke@435 | 40 | public: |
duke@435 | 41 | class StateVector; |
duke@435 | 42 | class Block; |
duke@435 | 43 | |
duke@435 | 44 | // Build a type flow analyzer |
duke@435 | 45 | // Do an OSR analysis if osr_bci >= 0. |
duke@435 | 46 | ciTypeFlow(ciEnv* env, ciMethod* method, int osr_bci = InvocationEntryBci); |
duke@435 | 47 | |
duke@435 | 48 | // Accessors |
duke@435 | 49 | ciMethod* method() const { return _method; } |
duke@435 | 50 | ciEnv* env() { return _env; } |
duke@435 | 51 | Arena* arena() { return _env->arena(); } |
duke@435 | 52 | bool is_osr_flow() const{ return _osr_bci != InvocationEntryBci; } |
duke@435 | 53 | int start_bci() const { return is_osr_flow()? _osr_bci: 0; } |
duke@435 | 54 | int max_locals() const { return _max_locals; } |
duke@435 | 55 | int max_stack() const { return _max_stack; } |
duke@435 | 56 | int max_cells() const { return _max_locals + _max_stack; } |
duke@435 | 57 | int code_size() const { return _code_size; } |
duke@435 | 58 | |
duke@435 | 59 | // Represents information about an "active" jsr call. This |
duke@435 | 60 | // class represents a call to the routine at some entry address |
duke@435 | 61 | // with some distinct return address. |
duke@435 | 62 | class JsrRecord : public ResourceObj { |
duke@435 | 63 | private: |
duke@435 | 64 | int _entry_address; |
duke@435 | 65 | int _return_address; |
duke@435 | 66 | public: |
duke@435 | 67 | JsrRecord(int entry_address, int return_address) { |
duke@435 | 68 | _entry_address = entry_address; |
duke@435 | 69 | _return_address = return_address; |
duke@435 | 70 | } |
duke@435 | 71 | |
duke@435 | 72 | int entry_address() const { return _entry_address; } |
duke@435 | 73 | int return_address() const { return _return_address; } |
duke@435 | 74 | |
duke@435 | 75 | void print_on(outputStream* st) const { |
duke@435 | 76 | #ifndef PRODUCT |
duke@435 | 77 | st->print("%d->%d", entry_address(), return_address()); |
duke@435 | 78 | #endif |
duke@435 | 79 | } |
duke@435 | 80 | }; |
duke@435 | 81 | |
duke@435 | 82 | // A JsrSet represents some set of JsrRecords. This class |
duke@435 | 83 | // is used to record a set of all jsr routines which we permit |
duke@435 | 84 | // execution to return (ret) from. |
duke@435 | 85 | // |
duke@435 | 86 | // During abstract interpretation, JsrSets are used to determine |
duke@435 | 87 | // whether two paths which reach a given block are unique, and |
duke@435 | 88 | // should be cloned apart, or are compatible, and should merge |
duke@435 | 89 | // together. |
duke@435 | 90 | // |
duke@435 | 91 | // Note that different amounts of effort can be expended determining |
duke@435 | 92 | // if paths are compatible. <DISCUSSION> |
duke@435 | 93 | class JsrSet : public ResourceObj { |
duke@435 | 94 | private: |
duke@435 | 95 | GrowableArray<JsrRecord*>* _set; |
duke@435 | 96 | |
duke@435 | 97 | JsrRecord* record_at(int i) { |
duke@435 | 98 | return _set->at(i); |
duke@435 | 99 | } |
duke@435 | 100 | |
duke@435 | 101 | // Insert the given JsrRecord into the JsrSet, maintaining the order |
duke@435 | 102 | // of the set and replacing any element with the same entry address. |
duke@435 | 103 | void insert_jsr_record(JsrRecord* record); |
duke@435 | 104 | |
duke@435 | 105 | // Remove the JsrRecord with the given return address from the JsrSet. |
duke@435 | 106 | void remove_jsr_record(int return_address); |
duke@435 | 107 | |
duke@435 | 108 | public: |
duke@435 | 109 | JsrSet(Arena* arena, int default_len = 4); |
duke@435 | 110 | |
duke@435 | 111 | // Copy this JsrSet. |
duke@435 | 112 | void copy_into(JsrSet* jsrs); |
duke@435 | 113 | |
duke@435 | 114 | // Is this JsrSet compatible with some other JsrSet? |
duke@435 | 115 | bool is_compatible_with(JsrSet* other); |
duke@435 | 116 | |
duke@435 | 117 | // Apply the effect of a single bytecode to the JsrSet. |
duke@435 | 118 | void apply_control(ciTypeFlow* analyzer, |
duke@435 | 119 | ciBytecodeStream* str, |
duke@435 | 120 | StateVector* state); |
duke@435 | 121 | |
duke@435 | 122 | // What is the cardinality of this set? |
duke@435 | 123 | int size() const { return _set->length(); } |
duke@435 | 124 | |
duke@435 | 125 | void print_on(outputStream* st) const PRODUCT_RETURN; |
duke@435 | 126 | }; |
duke@435 | 127 | |
duke@435 | 128 | // Used as a combined index for locals and temps |
duke@435 | 129 | enum Cell { |
never@738 | 130 | Cell_0, Cell_max = INT_MAX |
duke@435 | 131 | }; |
duke@435 | 132 | |
duke@435 | 133 | // A StateVector summarizes the type information at some |
duke@435 | 134 | // point in the program |
duke@435 | 135 | class StateVector : public ResourceObj { |
duke@435 | 136 | private: |
duke@435 | 137 | ciType** _types; |
duke@435 | 138 | int _stack_size; |
duke@435 | 139 | int _monitor_count; |
duke@435 | 140 | ciTypeFlow* _outer; |
duke@435 | 141 | |
duke@435 | 142 | int _trap_bci; |
duke@435 | 143 | int _trap_index; |
duke@435 | 144 | |
duke@435 | 145 | static ciType* type_meet_internal(ciType* t1, ciType* t2, ciTypeFlow* analyzer); |
duke@435 | 146 | |
duke@435 | 147 | public: |
duke@435 | 148 | // Special elements in our type lattice. |
duke@435 | 149 | enum { |
duke@435 | 150 | T_TOP = T_VOID, // why not? |
duke@435 | 151 | T_BOTTOM = T_CONFLICT, |
duke@435 | 152 | T_LONG2 = T_SHORT, // 2nd word of T_LONG |
duke@435 | 153 | T_DOUBLE2 = T_CHAR, // 2nd word of T_DOUBLE |
duke@435 | 154 | T_NULL = T_BYTE // for now. |
duke@435 | 155 | }; |
duke@435 | 156 | static ciType* top_type() { return ciType::make((BasicType)T_TOP); } |
duke@435 | 157 | static ciType* bottom_type() { return ciType::make((BasicType)T_BOTTOM); } |
duke@435 | 158 | static ciType* long2_type() { return ciType::make((BasicType)T_LONG2); } |
duke@435 | 159 | static ciType* double2_type(){ return ciType::make((BasicType)T_DOUBLE2); } |
duke@435 | 160 | static ciType* null_type() { return ciType::make((BasicType)T_NULL); } |
duke@435 | 161 | |
duke@435 | 162 | static ciType* half_type(ciType* t) { |
duke@435 | 163 | switch (t->basic_type()) { |
duke@435 | 164 | case T_LONG: return long2_type(); |
duke@435 | 165 | case T_DOUBLE: return double2_type(); |
duke@435 | 166 | default: ShouldNotReachHere(); return NULL; |
duke@435 | 167 | } |
duke@435 | 168 | } |
duke@435 | 169 | |
duke@435 | 170 | // The meet operation for our type lattice. |
duke@435 | 171 | ciType* type_meet(ciType* t1, ciType* t2) { |
duke@435 | 172 | return type_meet_internal(t1, t2, outer()); |
duke@435 | 173 | } |
duke@435 | 174 | |
duke@435 | 175 | // Accessors |
duke@435 | 176 | ciTypeFlow* outer() const { return _outer; } |
duke@435 | 177 | |
duke@435 | 178 | int stack_size() const { return _stack_size; } |
duke@435 | 179 | void set_stack_size(int ss) { _stack_size = ss; } |
duke@435 | 180 | |
duke@435 | 181 | int monitor_count() const { return _monitor_count; } |
duke@435 | 182 | void set_monitor_count(int mc) { _monitor_count = mc; } |
duke@435 | 183 | |
duke@435 | 184 | static Cell start_cell() { return (Cell)0; } |
duke@435 | 185 | static Cell next_cell(Cell c) { return (Cell)(((int)c) + 1); } |
duke@435 | 186 | Cell limit_cell() const { |
duke@435 | 187 | return (Cell)(outer()->max_locals() + stack_size()); |
duke@435 | 188 | } |
duke@435 | 189 | |
duke@435 | 190 | // Cell creation |
duke@435 | 191 | Cell local(int lnum) const { |
duke@435 | 192 | assert(lnum < outer()->max_locals(), "index check"); |
duke@435 | 193 | return (Cell)(lnum); |
duke@435 | 194 | } |
duke@435 | 195 | |
duke@435 | 196 | Cell stack(int snum) const { |
duke@435 | 197 | assert(snum < stack_size(), "index check"); |
duke@435 | 198 | return (Cell)(outer()->max_locals() + snum); |
duke@435 | 199 | } |
duke@435 | 200 | |
duke@435 | 201 | Cell tos() const { return stack(stack_size()-1); } |
duke@435 | 202 | |
duke@435 | 203 | // For external use only: |
duke@435 | 204 | ciType* local_type_at(int i) const { return type_at(local(i)); } |
duke@435 | 205 | ciType* stack_type_at(int i) const { return type_at(stack(i)); } |
duke@435 | 206 | |
duke@435 | 207 | // Accessors for the type of some Cell c |
duke@435 | 208 | ciType* type_at(Cell c) const { |
duke@435 | 209 | assert(start_cell() <= c && c < limit_cell(), "out of bounds"); |
duke@435 | 210 | return _types[c]; |
duke@435 | 211 | } |
duke@435 | 212 | |
duke@435 | 213 | void set_type_at(Cell c, ciType* type) { |
duke@435 | 214 | assert(start_cell() <= c && c < limit_cell(), "out of bounds"); |
duke@435 | 215 | _types[c] = type; |
duke@435 | 216 | } |
duke@435 | 217 | |
duke@435 | 218 | // Top-of-stack operations. |
duke@435 | 219 | void set_type_at_tos(ciType* type) { set_type_at(tos(), type); } |
duke@435 | 220 | ciType* type_at_tos() const { return type_at(tos()); } |
duke@435 | 221 | |
duke@435 | 222 | void push(ciType* type) { |
duke@435 | 223 | _stack_size++; |
duke@435 | 224 | set_type_at_tos(type); |
duke@435 | 225 | } |
duke@435 | 226 | void pop() { |
duke@435 | 227 | debug_only(set_type_at_tos(bottom_type())); |
duke@435 | 228 | _stack_size--; |
duke@435 | 229 | } |
duke@435 | 230 | ciType* pop_value() { |
duke@435 | 231 | ciType* t = type_at_tos(); |
duke@435 | 232 | pop(); |
duke@435 | 233 | return t; |
duke@435 | 234 | } |
duke@435 | 235 | |
duke@435 | 236 | // Convenience operations. |
duke@435 | 237 | bool is_reference(ciType* type) const { |
duke@435 | 238 | return type == null_type() || !type->is_primitive_type(); |
duke@435 | 239 | } |
duke@435 | 240 | bool is_int(ciType* type) const { |
duke@435 | 241 | return type->basic_type() == T_INT; |
duke@435 | 242 | } |
duke@435 | 243 | bool is_long(ciType* type) const { |
duke@435 | 244 | return type->basic_type() == T_LONG; |
duke@435 | 245 | } |
duke@435 | 246 | bool is_float(ciType* type) const { |
duke@435 | 247 | return type->basic_type() == T_FLOAT; |
duke@435 | 248 | } |
duke@435 | 249 | bool is_double(ciType* type) const { |
duke@435 | 250 | return type->basic_type() == T_DOUBLE; |
duke@435 | 251 | } |
duke@435 | 252 | |
duke@435 | 253 | void push_translate(ciType* type); |
duke@435 | 254 | |
duke@435 | 255 | void push_int() { |
duke@435 | 256 | push(ciType::make(T_INT)); |
duke@435 | 257 | } |
duke@435 | 258 | void pop_int() { |
duke@435 | 259 | assert(is_int(type_at_tos()), "must be integer"); |
duke@435 | 260 | pop(); |
duke@435 | 261 | } |
duke@435 | 262 | void check_int(Cell c) { |
duke@435 | 263 | assert(is_int(type_at(c)), "must be integer"); |
duke@435 | 264 | } |
duke@435 | 265 | void push_double() { |
duke@435 | 266 | push(ciType::make(T_DOUBLE)); |
duke@435 | 267 | push(double2_type()); |
duke@435 | 268 | } |
duke@435 | 269 | void pop_double() { |
duke@435 | 270 | assert(type_at_tos() == double2_type(), "must be 2nd half"); |
duke@435 | 271 | pop(); |
duke@435 | 272 | assert(is_double(type_at_tos()), "must be double"); |
duke@435 | 273 | pop(); |
duke@435 | 274 | } |
duke@435 | 275 | void push_float() { |
duke@435 | 276 | push(ciType::make(T_FLOAT)); |
duke@435 | 277 | } |
duke@435 | 278 | void pop_float() { |
duke@435 | 279 | assert(is_float(type_at_tos()), "must be float"); |
duke@435 | 280 | pop(); |
duke@435 | 281 | } |
duke@435 | 282 | void push_long() { |
duke@435 | 283 | push(ciType::make(T_LONG)); |
duke@435 | 284 | push(long2_type()); |
duke@435 | 285 | } |
duke@435 | 286 | void pop_long() { |
duke@435 | 287 | assert(type_at_tos() == long2_type(), "must be 2nd half"); |
duke@435 | 288 | pop(); |
duke@435 | 289 | assert(is_long(type_at_tos()), "must be long"); |
duke@435 | 290 | pop(); |
duke@435 | 291 | } |
duke@435 | 292 | void push_object(ciKlass* klass) { |
duke@435 | 293 | push(klass); |
duke@435 | 294 | } |
duke@435 | 295 | void pop_object() { |
duke@435 | 296 | assert(is_reference(type_at_tos()), "must be reference type"); |
duke@435 | 297 | pop(); |
duke@435 | 298 | } |
duke@435 | 299 | void pop_array() { |
duke@435 | 300 | assert(type_at_tos() == null_type() || |
duke@435 | 301 | type_at_tos()->is_array_klass(), "must be array type"); |
duke@435 | 302 | pop(); |
duke@435 | 303 | } |
duke@435 | 304 | // pop_objArray and pop_typeArray narrow the tos to ciObjArrayKlass |
duke@435 | 305 | // or ciTypeArrayKlass (resp.). In the rare case that an explicit |
duke@435 | 306 | // null is popped from the stack, we return NULL. Caller beware. |
duke@435 | 307 | ciObjArrayKlass* pop_objArray() { |
duke@435 | 308 | ciType* array = pop_value(); |
duke@435 | 309 | if (array == null_type()) return NULL; |
duke@435 | 310 | assert(array->is_obj_array_klass(), "must be object array type"); |
duke@435 | 311 | return array->as_obj_array_klass(); |
duke@435 | 312 | } |
duke@435 | 313 | ciTypeArrayKlass* pop_typeArray() { |
duke@435 | 314 | ciType* array = pop_value(); |
duke@435 | 315 | if (array == null_type()) return NULL; |
duke@435 | 316 | assert(array->is_type_array_klass(), "must be prim array type"); |
duke@435 | 317 | return array->as_type_array_klass(); |
duke@435 | 318 | } |
duke@435 | 319 | void push_null() { |
duke@435 | 320 | push(null_type()); |
duke@435 | 321 | } |
duke@435 | 322 | void do_null_assert(ciKlass* unloaded_klass); |
duke@435 | 323 | |
duke@435 | 324 | // Helper convenience routines. |
duke@435 | 325 | void do_aaload(ciBytecodeStream* str); |
duke@435 | 326 | void do_checkcast(ciBytecodeStream* str); |
duke@435 | 327 | void do_getfield(ciBytecodeStream* str); |
duke@435 | 328 | void do_getstatic(ciBytecodeStream* str); |
duke@435 | 329 | void do_invoke(ciBytecodeStream* str, bool has_receiver); |
duke@435 | 330 | void do_jsr(ciBytecodeStream* str); |
duke@435 | 331 | void do_ldc(ciBytecodeStream* str); |
duke@435 | 332 | void do_multianewarray(ciBytecodeStream* str); |
duke@435 | 333 | void do_new(ciBytecodeStream* str); |
duke@435 | 334 | void do_newarray(ciBytecodeStream* str); |
duke@435 | 335 | void do_putfield(ciBytecodeStream* str); |
duke@435 | 336 | void do_putstatic(ciBytecodeStream* str); |
duke@435 | 337 | void do_ret(ciBytecodeStream* str); |
duke@435 | 338 | |
duke@435 | 339 | void overwrite_local_double_long(int index) { |
duke@435 | 340 | // Invalidate the previous local if it contains first half of |
duke@435 | 341 | // a double or long value since it's seconf half is being overwritten. |
duke@435 | 342 | int prev_index = index - 1; |
duke@435 | 343 | if (prev_index >= 0 && |
duke@435 | 344 | (is_double(type_at(local(prev_index))) || |
duke@435 | 345 | is_long(type_at(local(prev_index))))) { |
duke@435 | 346 | set_type_at(local(prev_index), bottom_type()); |
duke@435 | 347 | } |
duke@435 | 348 | } |
duke@435 | 349 | |
duke@435 | 350 | void load_local_object(int index) { |
duke@435 | 351 | ciType* type = type_at(local(index)); |
duke@435 | 352 | assert(is_reference(type), "must be reference type"); |
duke@435 | 353 | push(type); |
duke@435 | 354 | } |
duke@435 | 355 | void store_local_object(int index) { |
duke@435 | 356 | ciType* type = pop_value(); |
duke@435 | 357 | assert(is_reference(type) || type->is_return_address(), |
duke@435 | 358 | "must be reference type or return address"); |
duke@435 | 359 | overwrite_local_double_long(index); |
duke@435 | 360 | set_type_at(local(index), type); |
duke@435 | 361 | } |
duke@435 | 362 | |
duke@435 | 363 | void load_local_double(int index) { |
duke@435 | 364 | ciType* type = type_at(local(index)); |
duke@435 | 365 | ciType* type2 = type_at(local(index+1)); |
duke@435 | 366 | assert(is_double(type), "must be double type"); |
duke@435 | 367 | assert(type2 == double2_type(), "must be 2nd half"); |
duke@435 | 368 | push(type); |
duke@435 | 369 | push(double2_type()); |
duke@435 | 370 | } |
duke@435 | 371 | void store_local_double(int index) { |
duke@435 | 372 | ciType* type2 = pop_value(); |
duke@435 | 373 | ciType* type = pop_value(); |
duke@435 | 374 | assert(is_double(type), "must be double"); |
duke@435 | 375 | assert(type2 == double2_type(), "must be 2nd half"); |
duke@435 | 376 | overwrite_local_double_long(index); |
duke@435 | 377 | set_type_at(local(index), type); |
duke@435 | 378 | set_type_at(local(index+1), type2); |
duke@435 | 379 | } |
duke@435 | 380 | |
duke@435 | 381 | void load_local_float(int index) { |
duke@435 | 382 | ciType* type = type_at(local(index)); |
duke@435 | 383 | assert(is_float(type), "must be float type"); |
duke@435 | 384 | push(type); |
duke@435 | 385 | } |
duke@435 | 386 | void store_local_float(int index) { |
duke@435 | 387 | ciType* type = pop_value(); |
duke@435 | 388 | assert(is_float(type), "must be float type"); |
duke@435 | 389 | overwrite_local_double_long(index); |
duke@435 | 390 | set_type_at(local(index), type); |
duke@435 | 391 | } |
duke@435 | 392 | |
duke@435 | 393 | void load_local_int(int index) { |
duke@435 | 394 | ciType* type = type_at(local(index)); |
duke@435 | 395 | assert(is_int(type), "must be int type"); |
duke@435 | 396 | push(type); |
duke@435 | 397 | } |
duke@435 | 398 | void store_local_int(int index) { |
duke@435 | 399 | ciType* type = pop_value(); |
duke@435 | 400 | assert(is_int(type), "must be int type"); |
duke@435 | 401 | overwrite_local_double_long(index); |
duke@435 | 402 | set_type_at(local(index), type); |
duke@435 | 403 | } |
duke@435 | 404 | |
duke@435 | 405 | void load_local_long(int index) { |
duke@435 | 406 | ciType* type = type_at(local(index)); |
duke@435 | 407 | ciType* type2 = type_at(local(index+1)); |
duke@435 | 408 | assert(is_long(type), "must be long type"); |
duke@435 | 409 | assert(type2 == long2_type(), "must be 2nd half"); |
duke@435 | 410 | push(type); |
duke@435 | 411 | push(long2_type()); |
duke@435 | 412 | } |
duke@435 | 413 | void store_local_long(int index) { |
duke@435 | 414 | ciType* type2 = pop_value(); |
duke@435 | 415 | ciType* type = pop_value(); |
duke@435 | 416 | assert(is_long(type), "must be long"); |
duke@435 | 417 | assert(type2 == long2_type(), "must be 2nd half"); |
duke@435 | 418 | overwrite_local_double_long(index); |
duke@435 | 419 | set_type_at(local(index), type); |
duke@435 | 420 | set_type_at(local(index+1), type2); |
duke@435 | 421 | } |
duke@435 | 422 | |
duke@435 | 423 | // Stop interpretation of this path with a trap. |
duke@435 | 424 | void trap(ciBytecodeStream* str, ciKlass* klass, int index); |
duke@435 | 425 | |
duke@435 | 426 | public: |
duke@435 | 427 | StateVector(ciTypeFlow* outer); |
duke@435 | 428 | |
duke@435 | 429 | // Copy our value into some other StateVector |
duke@435 | 430 | void copy_into(StateVector* copy) const; |
duke@435 | 431 | |
duke@435 | 432 | // Meets this StateVector with another, destructively modifying this |
duke@435 | 433 | // one. Returns true if any modification takes place. |
duke@435 | 434 | bool meet(const StateVector* incoming); |
duke@435 | 435 | |
duke@435 | 436 | // Ditto, except that the incoming state is coming from an exception. |
duke@435 | 437 | bool meet_exception(ciInstanceKlass* exc, const StateVector* incoming); |
duke@435 | 438 | |
duke@435 | 439 | // Apply the effect of one bytecode to this StateVector |
duke@435 | 440 | bool apply_one_bytecode(ciBytecodeStream* stream); |
duke@435 | 441 | |
duke@435 | 442 | // What is the bci of the trap? |
duke@435 | 443 | int trap_bci() { return _trap_bci; } |
duke@435 | 444 | |
duke@435 | 445 | // What is the index associated with the trap? |
duke@435 | 446 | int trap_index() { return _trap_index; } |
duke@435 | 447 | |
duke@435 | 448 | void print_cell_on(outputStream* st, Cell c) const PRODUCT_RETURN; |
duke@435 | 449 | void print_on(outputStream* st) const PRODUCT_RETURN; |
duke@435 | 450 | }; |
duke@435 | 451 | |
duke@435 | 452 | // Parameter for "find_block" calls: |
duke@435 | 453 | // Describes the difference between a public and private copy. |
duke@435 | 454 | enum CreateOption { |
duke@435 | 455 | create_public_copy, |
duke@435 | 456 | create_private_copy, |
duke@435 | 457 | no_create |
duke@435 | 458 | }; |
duke@435 | 459 | |
duke@435 | 460 | // A basic block |
duke@435 | 461 | class Block : public ResourceObj { |
duke@435 | 462 | private: |
duke@435 | 463 | ciBlock* _ciblock; |
duke@435 | 464 | GrowableArray<Block*>* _exceptions; |
duke@435 | 465 | GrowableArray<ciInstanceKlass*>* _exc_klasses; |
duke@435 | 466 | GrowableArray<Block*>* _successors; |
duke@435 | 467 | StateVector* _state; |
duke@435 | 468 | JsrSet* _jsrs; |
duke@435 | 469 | |
duke@435 | 470 | int _trap_bci; |
duke@435 | 471 | int _trap_index; |
duke@435 | 472 | |
duke@435 | 473 | // A reasonable approximation to pre-order, provided.to the client. |
duke@435 | 474 | int _pre_order; |
duke@435 | 475 | |
duke@435 | 476 | // Has this block been cloned for some special purpose? |
duke@435 | 477 | bool _private_copy; |
duke@435 | 478 | |
duke@435 | 479 | // A pointer used for our internal work list |
duke@435 | 480 | Block* _next; |
duke@435 | 481 | bool _on_work_list; |
duke@435 | 482 | |
duke@435 | 483 | ciBlock* ciblock() const { return _ciblock; } |
duke@435 | 484 | StateVector* state() const { return _state; } |
duke@435 | 485 | |
duke@435 | 486 | // Compute the exceptional successors and types for this Block. |
duke@435 | 487 | void compute_exceptions(); |
duke@435 | 488 | |
duke@435 | 489 | public: |
duke@435 | 490 | // constructors |
duke@435 | 491 | Block(ciTypeFlow* outer, ciBlock* ciblk, JsrSet* jsrs); |
duke@435 | 492 | |
duke@435 | 493 | void set_trap(int trap_bci, int trap_index) { |
duke@435 | 494 | _trap_bci = trap_bci; |
duke@435 | 495 | _trap_index = trap_index; |
duke@435 | 496 | assert(has_trap(), ""); |
duke@435 | 497 | } |
duke@435 | 498 | bool has_trap() const { return _trap_bci != -1; } |
duke@435 | 499 | int trap_bci() const { assert(has_trap(), ""); return _trap_bci; } |
duke@435 | 500 | int trap_index() const { assert(has_trap(), ""); return _trap_index; } |
duke@435 | 501 | |
duke@435 | 502 | // accessors |
duke@435 | 503 | ciTypeFlow* outer() const { return state()->outer(); } |
duke@435 | 504 | int start() const { return _ciblock->start_bci(); } |
duke@435 | 505 | int limit() const { return _ciblock->limit_bci(); } |
duke@435 | 506 | int control() const { return _ciblock->control_bci(); } |
duke@435 | 507 | |
duke@435 | 508 | bool is_private_copy() const { return _private_copy; } |
duke@435 | 509 | void set_private_copy(bool z); |
duke@435 | 510 | int private_copy_count() const { return outer()->private_copy_count(ciblock()->index(), _jsrs); } |
duke@435 | 511 | |
duke@435 | 512 | // access to entry state |
duke@435 | 513 | int stack_size() const { return _state->stack_size(); } |
duke@435 | 514 | int monitor_count() const { return _state->monitor_count(); } |
duke@435 | 515 | ciType* local_type_at(int i) const { return _state->local_type_at(i); } |
duke@435 | 516 | ciType* stack_type_at(int i) const { return _state->stack_type_at(i); } |
duke@435 | 517 | |
duke@435 | 518 | // Get the successors for this Block. |
duke@435 | 519 | GrowableArray<Block*>* successors(ciBytecodeStream* str, |
duke@435 | 520 | StateVector* state, |
duke@435 | 521 | JsrSet* jsrs); |
duke@435 | 522 | GrowableArray<Block*>* successors() { |
duke@435 | 523 | assert(_successors != NULL, "must be filled in"); |
duke@435 | 524 | return _successors; |
duke@435 | 525 | } |
duke@435 | 526 | |
duke@435 | 527 | // Helper function for "successors" when making private copies of |
duke@435 | 528 | // loop heads for C2. |
duke@435 | 529 | Block * clone_loop_head(ciTypeFlow* analyzer, |
duke@435 | 530 | int branch_bci, |
duke@435 | 531 | Block* target, |
duke@435 | 532 | JsrSet* jsrs); |
duke@435 | 533 | |
duke@435 | 534 | // Get the exceptional successors for this Block. |
duke@435 | 535 | GrowableArray<Block*>* exceptions() { |
duke@435 | 536 | if (_exceptions == NULL) { |
duke@435 | 537 | compute_exceptions(); |
duke@435 | 538 | } |
duke@435 | 539 | return _exceptions; |
duke@435 | 540 | } |
duke@435 | 541 | |
duke@435 | 542 | // Get the exception klasses corresponding to the |
duke@435 | 543 | // exceptional successors for this Block. |
duke@435 | 544 | GrowableArray<ciInstanceKlass*>* exc_klasses() { |
duke@435 | 545 | if (_exc_klasses == NULL) { |
duke@435 | 546 | compute_exceptions(); |
duke@435 | 547 | } |
duke@435 | 548 | return _exc_klasses; |
duke@435 | 549 | } |
duke@435 | 550 | |
duke@435 | 551 | // Is this Block compatible with a given JsrSet? |
duke@435 | 552 | bool is_compatible_with(JsrSet* other) { |
duke@435 | 553 | return _jsrs->is_compatible_with(other); |
duke@435 | 554 | } |
duke@435 | 555 | |
duke@435 | 556 | // Copy the value of our state vector into another. |
duke@435 | 557 | void copy_state_into(StateVector* copy) const { |
duke@435 | 558 | _state->copy_into(copy); |
duke@435 | 559 | } |
duke@435 | 560 | |
duke@435 | 561 | // Copy the value of our JsrSet into another |
duke@435 | 562 | void copy_jsrs_into(JsrSet* copy) const { |
duke@435 | 563 | _jsrs->copy_into(copy); |
duke@435 | 564 | } |
duke@435 | 565 | |
duke@435 | 566 | // Meets the start state of this block with another state, destructively |
duke@435 | 567 | // modifying this one. Returns true if any modification takes place. |
duke@435 | 568 | bool meet(const StateVector* incoming) { |
duke@435 | 569 | return state()->meet(incoming); |
duke@435 | 570 | } |
duke@435 | 571 | |
duke@435 | 572 | // Ditto, except that the incoming state is coming from an |
duke@435 | 573 | // exception path. This means the stack is replaced by the |
duke@435 | 574 | // appropriate exception type. |
duke@435 | 575 | bool meet_exception(ciInstanceKlass* exc, const StateVector* incoming) { |
duke@435 | 576 | return state()->meet_exception(exc, incoming); |
duke@435 | 577 | } |
duke@435 | 578 | |
duke@435 | 579 | // Work list manipulation |
duke@435 | 580 | void set_next(Block* block) { _next = block; } |
duke@435 | 581 | Block* next() const { return _next; } |
duke@435 | 582 | |
duke@435 | 583 | void set_on_work_list(bool c) { _on_work_list = c; } |
duke@435 | 584 | bool is_on_work_list() const { return _on_work_list; } |
duke@435 | 585 | |
duke@435 | 586 | bool has_pre_order() const { return _pre_order >= 0; } |
duke@435 | 587 | void set_pre_order(int po) { assert(!has_pre_order() && po >= 0, ""); _pre_order = po; } |
duke@435 | 588 | int pre_order() const { assert(has_pre_order(), ""); return _pre_order; } |
duke@435 | 589 | bool is_start() const { return _pre_order == outer()->start_block_num(); } |
duke@435 | 590 | |
duke@435 | 591 | // A ranking used in determining order within the work list. |
duke@435 | 592 | bool is_simpler_than(Block* other); |
duke@435 | 593 | |
duke@435 | 594 | void print_value_on(outputStream* st) const PRODUCT_RETURN; |
duke@435 | 595 | void print_on(outputStream* st) const PRODUCT_RETURN; |
duke@435 | 596 | }; |
duke@435 | 597 | |
duke@435 | 598 | // Standard indexes of successors, for various bytecodes. |
duke@435 | 599 | enum { |
duke@435 | 600 | FALL_THROUGH = 0, // normal control |
duke@435 | 601 | IF_NOT_TAKEN = 0, // the not-taken branch of an if (i.e., fall-through) |
duke@435 | 602 | IF_TAKEN = 1, // the taken branch of an if |
duke@435 | 603 | GOTO_TARGET = 0, // unique successor for goto, jsr, or ret |
duke@435 | 604 | SWITCH_DEFAULT = 0, // default branch of a switch |
duke@435 | 605 | SWITCH_CASES = 1 // first index for any non-default switch branches |
duke@435 | 606 | // Unlike in other blocks, the successors of a switch are listed uniquely. |
duke@435 | 607 | }; |
duke@435 | 608 | |
duke@435 | 609 | private: |
duke@435 | 610 | // A mapping from pre_order to Blocks. This array is created |
duke@435 | 611 | // only at the end of the flow. |
duke@435 | 612 | Block** _block_map; |
duke@435 | 613 | |
duke@435 | 614 | // For each ciBlock index, a list of Blocks which share this ciBlock. |
duke@435 | 615 | GrowableArray<Block*>** _idx_to_blocklist; |
duke@435 | 616 | // count of ciBlocks |
duke@435 | 617 | int _ciblock_count; |
duke@435 | 618 | |
duke@435 | 619 | // Tells if a given instruction is able to generate an exception edge. |
duke@435 | 620 | bool can_trap(ciBytecodeStream& str); |
duke@435 | 621 | |
duke@435 | 622 | public: |
duke@435 | 623 | // Return the block beginning at bci which has a JsrSet compatible |
duke@435 | 624 | // with jsrs. |
duke@435 | 625 | Block* block_at(int bci, JsrSet* set, CreateOption option = create_public_copy); |
duke@435 | 626 | |
duke@435 | 627 | // block factory |
duke@435 | 628 | Block* get_block_for(int ciBlockIndex, JsrSet* jsrs, CreateOption option = create_public_copy); |
duke@435 | 629 | |
duke@435 | 630 | // How many of the blocks have the private_copy bit set? |
duke@435 | 631 | int private_copy_count(int ciBlockIndex, JsrSet* jsrs) const; |
duke@435 | 632 | |
duke@435 | 633 | // Return an existing block containing bci which has a JsrSet compatible |
duke@435 | 634 | // with jsrs, or NULL if there is none. |
duke@435 | 635 | Block* existing_block_at(int bci, JsrSet* set) { return block_at(bci, set, no_create); } |
duke@435 | 636 | |
duke@435 | 637 | // Tell whether the flow analysis has encountered an error of some sort. |
duke@435 | 638 | bool failing() { return env()->failing() || _failure_reason != NULL; } |
duke@435 | 639 | |
duke@435 | 640 | // Reason this compilation is failing, such as "too many basic blocks". |
duke@435 | 641 | const char* failure_reason() { return _failure_reason; } |
duke@435 | 642 | |
duke@435 | 643 | // Note a failure. |
duke@435 | 644 | void record_failure(const char* reason); |
duke@435 | 645 | |
duke@435 | 646 | // Return the block of a given pre-order number. |
duke@435 | 647 | int have_block_count() const { return _block_map != NULL; } |
duke@435 | 648 | int block_count() const { assert(have_block_count(), ""); |
duke@435 | 649 | return _next_pre_order; } |
duke@435 | 650 | Block* pre_order_at(int po) const { assert(0 <= po && po < block_count(), "out of bounds"); |
duke@435 | 651 | return _block_map[po]; } |
duke@435 | 652 | Block* start_block() const { return pre_order_at(start_block_num()); } |
duke@435 | 653 | int start_block_num() const { return 0; } |
duke@435 | 654 | |
duke@435 | 655 | private: |
duke@435 | 656 | // A work list used during flow analysis. |
duke@435 | 657 | Block* _work_list; |
duke@435 | 658 | |
duke@435 | 659 | // Next Block::_pre_order. After mapping, doubles as block_count. |
duke@435 | 660 | int _next_pre_order; |
duke@435 | 661 | |
duke@435 | 662 | // Are there more blocks on the work list? |
duke@435 | 663 | bool work_list_empty() { return _work_list == NULL; } |
duke@435 | 664 | |
duke@435 | 665 | // Get the next basic block from our work list. |
duke@435 | 666 | Block* work_list_next(); |
duke@435 | 667 | |
duke@435 | 668 | // Add a basic block to our work list. |
duke@435 | 669 | void add_to_work_list(Block* block); |
duke@435 | 670 | |
duke@435 | 671 | // State used for make_jsr_record |
duke@435 | 672 | int _jsr_count; |
duke@435 | 673 | GrowableArray<JsrRecord*>* _jsr_records; |
duke@435 | 674 | |
duke@435 | 675 | public: |
duke@435 | 676 | // Make a JsrRecord for a given (entry, return) pair, if such a record |
duke@435 | 677 | // does not already exist. |
duke@435 | 678 | JsrRecord* make_jsr_record(int entry_address, int return_address); |
duke@435 | 679 | |
duke@435 | 680 | private: |
duke@435 | 681 | // Get the initial state for start_bci: |
duke@435 | 682 | const StateVector* get_start_state(); |
duke@435 | 683 | |
duke@435 | 684 | // Merge the current state into all exceptional successors at the |
duke@435 | 685 | // current point in the code. |
duke@435 | 686 | void flow_exceptions(GrowableArray<Block*>* exceptions, |
duke@435 | 687 | GrowableArray<ciInstanceKlass*>* exc_klasses, |
duke@435 | 688 | StateVector* state); |
duke@435 | 689 | |
duke@435 | 690 | // Merge the current state into all successors at the current point |
duke@435 | 691 | // in the code. |
duke@435 | 692 | void flow_successors(GrowableArray<Block*>* successors, |
duke@435 | 693 | StateVector* state); |
duke@435 | 694 | |
duke@435 | 695 | // Interpret the effects of the bytecodes on the incoming state |
duke@435 | 696 | // vector of a basic block. Push the changed state to succeeding |
duke@435 | 697 | // basic blocks. |
duke@435 | 698 | void flow_block(Block* block, |
duke@435 | 699 | StateVector* scratch_state, |
duke@435 | 700 | JsrSet* scratch_jsrs); |
duke@435 | 701 | |
duke@435 | 702 | // Perform the type flow analysis, creating and cloning Blocks as |
duke@435 | 703 | // necessary. |
duke@435 | 704 | void flow_types(); |
duke@435 | 705 | |
duke@435 | 706 | // Create the block map, which indexes blocks in pre_order. |
duke@435 | 707 | void map_blocks(); |
duke@435 | 708 | |
duke@435 | 709 | public: |
duke@435 | 710 | // Perform type inference flow analysis. |
duke@435 | 711 | void do_flow(); |
duke@435 | 712 | |
duke@435 | 713 | void print_on(outputStream* st) const PRODUCT_RETURN; |
duke@435 | 714 | }; |