Wed, 03 Jul 2019 20:42:37 +0800
Merge
aoqi@0 | 1 | /* |
aoqi@0 | 2 | * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. |
aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
aoqi@0 | 4 | * |
aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
aoqi@0 | 7 | * published by the Free Software Foundation. |
aoqi@0 | 8 | * |
aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
aoqi@0 | 13 | * accompanied this code). |
aoqi@0 | 14 | * |
aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
aoqi@0 | 18 | * |
aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
aoqi@0 | 21 | * questions. |
aoqi@0 | 22 | * |
aoqi@0 | 23 | */ |
aoqi@0 | 24 | |
aoqi@0 | 25 | #ifndef SHARE_VM_CI_CITYPEFLOW_HPP |
aoqi@0 | 26 | #define SHARE_VM_CI_CITYPEFLOW_HPP |
aoqi@0 | 27 | |
aoqi@0 | 28 | #ifdef COMPILER2 |
aoqi@0 | 29 | #include "ci/ciEnv.hpp" |
aoqi@0 | 30 | #include "ci/ciKlass.hpp" |
aoqi@0 | 31 | #include "ci/ciMethodBlocks.hpp" |
aoqi@0 | 32 | #endif |
aoqi@0 | 33 | #ifdef SHARK |
aoqi@0 | 34 | #include "ci/ciEnv.hpp" |
aoqi@0 | 35 | #include "ci/ciKlass.hpp" |
aoqi@0 | 36 | #include "ci/ciMethodBlocks.hpp" |
aoqi@0 | 37 | #include "shark/shark_globals.hpp" |
aoqi@0 | 38 | #endif |
aoqi@0 | 39 | |
aoqi@0 | 40 | |
aoqi@0 | 41 | class ciTypeFlow : public ResourceObj { |
aoqi@0 | 42 | private: |
aoqi@0 | 43 | ciEnv* _env; |
aoqi@0 | 44 | ciMethod* _method; |
aoqi@0 | 45 | ciMethodBlocks* _methodBlocks; |
aoqi@0 | 46 | int _osr_bci; |
aoqi@0 | 47 | |
aoqi@0 | 48 | // information cached from the method: |
aoqi@0 | 49 | int _max_locals; |
aoqi@0 | 50 | int _max_stack; |
aoqi@0 | 51 | int _code_size; |
aoqi@0 | 52 | bool _has_irreducible_entry; |
aoqi@0 | 53 | |
aoqi@0 | 54 | const char* _failure_reason; |
aoqi@0 | 55 | |
aoqi@0 | 56 | public: |
aoqi@0 | 57 | class StateVector; |
aoqi@0 | 58 | class Loop; |
aoqi@0 | 59 | class Block; |
aoqi@0 | 60 | |
aoqi@0 | 61 | // Build a type flow analyzer |
aoqi@0 | 62 | // Do an OSR analysis if osr_bci >= 0. |
aoqi@0 | 63 | ciTypeFlow(ciEnv* env, ciMethod* method, int osr_bci = InvocationEntryBci); |
aoqi@0 | 64 | |
aoqi@0 | 65 | // Accessors |
aoqi@0 | 66 | ciMethod* method() const { return _method; } |
aoqi@0 | 67 | ciEnv* env() { return _env; } |
aoqi@0 | 68 | Arena* arena() { return _env->arena(); } |
aoqi@0 | 69 | bool is_osr_flow() const{ return _osr_bci != InvocationEntryBci; } |
aoqi@0 | 70 | int start_bci() const { return is_osr_flow()? _osr_bci: 0; } |
aoqi@0 | 71 | int max_locals() const { return _max_locals; } |
aoqi@0 | 72 | int max_stack() const { return _max_stack; } |
aoqi@0 | 73 | int max_cells() const { return _max_locals + _max_stack; } |
aoqi@0 | 74 | int code_size() const { return _code_size; } |
aoqi@0 | 75 | bool has_irreducible_entry() const { return _has_irreducible_entry; } |
aoqi@0 | 76 | |
aoqi@0 | 77 | // Represents information about an "active" jsr call. This |
aoqi@0 | 78 | // class represents a call to the routine at some entry address |
aoqi@0 | 79 | // with some distinct return address. |
aoqi@0 | 80 | class JsrRecord : public ResourceObj { |
aoqi@0 | 81 | private: |
aoqi@0 | 82 | int _entry_address; |
aoqi@0 | 83 | int _return_address; |
aoqi@0 | 84 | public: |
aoqi@0 | 85 | JsrRecord(int entry_address, int return_address) { |
aoqi@0 | 86 | _entry_address = entry_address; |
aoqi@0 | 87 | _return_address = return_address; |
aoqi@0 | 88 | } |
aoqi@0 | 89 | |
aoqi@0 | 90 | int entry_address() const { return _entry_address; } |
aoqi@0 | 91 | int return_address() const { return _return_address; } |
aoqi@0 | 92 | |
aoqi@0 | 93 | void print_on(outputStream* st) const { |
aoqi@0 | 94 | #ifndef PRODUCT |
aoqi@0 | 95 | st->print("%d->%d", entry_address(), return_address()); |
aoqi@0 | 96 | #endif |
aoqi@0 | 97 | } |
aoqi@0 | 98 | }; |
aoqi@0 | 99 | |
aoqi@0 | 100 | // A JsrSet represents some set of JsrRecords. This class |
aoqi@0 | 101 | // is used to record a set of all jsr routines which we permit |
aoqi@0 | 102 | // execution to return (ret) from. |
aoqi@0 | 103 | // |
aoqi@0 | 104 | // During abstract interpretation, JsrSets are used to determine |
aoqi@0 | 105 | // whether two paths which reach a given block are unique, and |
aoqi@0 | 106 | // should be cloned apart, or are compatible, and should merge |
aoqi@0 | 107 | // together. |
aoqi@0 | 108 | // |
aoqi@0 | 109 | // Note that different amounts of effort can be expended determining |
aoqi@0 | 110 | // if paths are compatible. <DISCUSSION> |
aoqi@0 | 111 | class JsrSet : public ResourceObj { |
aoqi@0 | 112 | private: |
aoqi@0 | 113 | GrowableArray<JsrRecord*>* _set; |
aoqi@0 | 114 | |
aoqi@0 | 115 | JsrRecord* record_at(int i) { |
aoqi@0 | 116 | return _set->at(i); |
aoqi@0 | 117 | } |
aoqi@0 | 118 | |
aoqi@0 | 119 | // Insert the given JsrRecord into the JsrSet, maintaining the order |
aoqi@0 | 120 | // of the set and replacing any element with the same entry address. |
aoqi@0 | 121 | void insert_jsr_record(JsrRecord* record); |
aoqi@0 | 122 | |
aoqi@0 | 123 | // Remove the JsrRecord with the given return address from the JsrSet. |
aoqi@0 | 124 | void remove_jsr_record(int return_address); |
aoqi@0 | 125 | |
aoqi@0 | 126 | public: |
aoqi@0 | 127 | JsrSet(Arena* arena, int default_len = 4); |
aoqi@0 | 128 | |
aoqi@0 | 129 | // Copy this JsrSet. |
aoqi@0 | 130 | void copy_into(JsrSet* jsrs); |
aoqi@0 | 131 | |
aoqi@0 | 132 | // Is this JsrSet compatible with some other JsrSet? |
aoqi@0 | 133 | bool is_compatible_with(JsrSet* other); |
aoqi@0 | 134 | |
aoqi@0 | 135 | // Apply the effect of a single bytecode to the JsrSet. |
aoqi@0 | 136 | void apply_control(ciTypeFlow* analyzer, |
aoqi@0 | 137 | ciBytecodeStream* str, |
aoqi@0 | 138 | StateVector* state); |
aoqi@0 | 139 | |
aoqi@0 | 140 | // What is the cardinality of this set? |
aoqi@0 | 141 | int size() const { return _set->length(); } |
aoqi@0 | 142 | |
aoqi@0 | 143 | void print_on(outputStream* st) const PRODUCT_RETURN; |
aoqi@0 | 144 | }; |
aoqi@0 | 145 | |
aoqi@0 | 146 | class LocalSet VALUE_OBJ_CLASS_SPEC { |
aoqi@0 | 147 | private: |
aoqi@0 | 148 | enum Constants { max = 63 }; |
aoqi@0 | 149 | uint64_t _bits; |
aoqi@0 | 150 | public: |
aoqi@0 | 151 | LocalSet() : _bits(0) {} |
aoqi@0 | 152 | void add(uint32_t i) { if (i < (uint32_t)max) _bits |= (1LL << i); } |
aoqi@0 | 153 | void add(LocalSet* ls) { _bits |= ls->_bits; } |
aoqi@0 | 154 | bool test(uint32_t i) const { return i < (uint32_t)max ? (_bits>>i)&1U : true; } |
aoqi@0 | 155 | void clear() { _bits = 0; } |
aoqi@0 | 156 | void print_on(outputStream* st, int limit) const PRODUCT_RETURN; |
aoqi@0 | 157 | }; |
aoqi@0 | 158 | |
aoqi@0 | 159 | // Used as a combined index for locals and temps |
aoqi@0 | 160 | enum Cell { |
aoqi@0 | 161 | Cell_0, Cell_max = INT_MAX |
aoqi@0 | 162 | }; |
aoqi@0 | 163 | |
aoqi@0 | 164 | // A StateVector summarizes the type information at some |
aoqi@0 | 165 | // point in the program |
aoqi@0 | 166 | class StateVector : public ResourceObj { |
aoqi@0 | 167 | private: |
aoqi@0 | 168 | ciType** _types; |
aoqi@0 | 169 | int _stack_size; |
aoqi@0 | 170 | int _monitor_count; |
aoqi@0 | 171 | ciTypeFlow* _outer; |
aoqi@0 | 172 | |
aoqi@0 | 173 | int _trap_bci; |
aoqi@0 | 174 | int _trap_index; |
aoqi@0 | 175 | |
aoqi@0 | 176 | LocalSet _def_locals; // For entire block |
aoqi@0 | 177 | |
aoqi@0 | 178 | static ciType* type_meet_internal(ciType* t1, ciType* t2, ciTypeFlow* analyzer); |
aoqi@0 | 179 | |
aoqi@0 | 180 | public: |
aoqi@0 | 181 | // Special elements in our type lattice. |
aoqi@0 | 182 | enum { |
aoqi@0 | 183 | T_TOP = T_VOID, // why not? |
aoqi@0 | 184 | T_BOTTOM = T_CONFLICT, |
aoqi@0 | 185 | T_LONG2 = T_SHORT, // 2nd word of T_LONG |
aoqi@0 | 186 | T_DOUBLE2 = T_CHAR, // 2nd word of T_DOUBLE |
aoqi@0 | 187 | T_NULL = T_BYTE // for now. |
aoqi@0 | 188 | }; |
aoqi@0 | 189 | static ciType* top_type() { return ciType::make((BasicType)T_TOP); } |
aoqi@0 | 190 | static ciType* bottom_type() { return ciType::make((BasicType)T_BOTTOM); } |
aoqi@0 | 191 | static ciType* long2_type() { return ciType::make((BasicType)T_LONG2); } |
aoqi@0 | 192 | static ciType* double2_type(){ return ciType::make((BasicType)T_DOUBLE2); } |
aoqi@0 | 193 | static ciType* null_type() { return ciType::make((BasicType)T_NULL); } |
aoqi@0 | 194 | |
aoqi@0 | 195 | static ciType* half_type(ciType* t) { |
aoqi@0 | 196 | switch (t->basic_type()) { |
aoqi@0 | 197 | case T_LONG: return long2_type(); |
aoqi@0 | 198 | case T_DOUBLE: return double2_type(); |
aoqi@0 | 199 | default: ShouldNotReachHere(); return NULL; |
aoqi@0 | 200 | } |
aoqi@0 | 201 | } |
aoqi@0 | 202 | |
aoqi@0 | 203 | // The meet operation for our type lattice. |
aoqi@0 | 204 | ciType* type_meet(ciType* t1, ciType* t2) { |
aoqi@0 | 205 | return type_meet_internal(t1, t2, outer()); |
aoqi@0 | 206 | } |
aoqi@0 | 207 | |
aoqi@0 | 208 | // Accessors |
aoqi@0 | 209 | ciTypeFlow* outer() const { return _outer; } |
aoqi@0 | 210 | |
aoqi@0 | 211 | int stack_size() const { return _stack_size; } |
aoqi@0 | 212 | void set_stack_size(int ss) { _stack_size = ss; } |
aoqi@0 | 213 | |
aoqi@0 | 214 | int monitor_count() const { return _monitor_count; } |
aoqi@0 | 215 | void set_monitor_count(int mc) { _monitor_count = mc; } |
aoqi@0 | 216 | |
aoqi@0 | 217 | LocalSet* def_locals() { return &_def_locals; } |
aoqi@0 | 218 | const LocalSet* def_locals() const { return &_def_locals; } |
aoqi@0 | 219 | |
aoqi@0 | 220 | static Cell start_cell() { return (Cell)0; } |
aoqi@0 | 221 | static Cell next_cell(Cell c) { return (Cell)(((int)c) + 1); } |
aoqi@0 | 222 | Cell limit_cell() const { |
aoqi@0 | 223 | return (Cell)(outer()->max_locals() + stack_size()); |
aoqi@0 | 224 | } |
aoqi@0 | 225 | |
aoqi@0 | 226 | // Cell creation |
aoqi@0 | 227 | Cell local(int lnum) const { |
aoqi@0 | 228 | assert(lnum < outer()->max_locals(), "index check"); |
aoqi@0 | 229 | return (Cell)(lnum); |
aoqi@0 | 230 | } |
aoqi@0 | 231 | |
aoqi@0 | 232 | Cell stack(int snum) const { |
aoqi@0 | 233 | assert(snum < stack_size(), "index check"); |
aoqi@0 | 234 | return (Cell)(outer()->max_locals() + snum); |
aoqi@0 | 235 | } |
aoqi@0 | 236 | |
aoqi@0 | 237 | Cell tos() const { return stack(stack_size()-1); } |
aoqi@0 | 238 | |
aoqi@0 | 239 | // For external use only: |
aoqi@0 | 240 | ciType* local_type_at(int i) const { return type_at(local(i)); } |
aoqi@0 | 241 | ciType* stack_type_at(int i) const { return type_at(stack(i)); } |
aoqi@0 | 242 | |
aoqi@0 | 243 | // Accessors for the type of some Cell c |
aoqi@0 | 244 | ciType* type_at(Cell c) const { |
aoqi@0 | 245 | assert(start_cell() <= c && c < limit_cell(), "out of bounds"); |
aoqi@0 | 246 | return _types[c]; |
aoqi@0 | 247 | } |
aoqi@0 | 248 | |
aoqi@0 | 249 | void set_type_at(Cell c, ciType* type) { |
aoqi@0 | 250 | assert(start_cell() <= c && c < limit_cell(), "out of bounds"); |
aoqi@0 | 251 | _types[c] = type; |
aoqi@0 | 252 | } |
aoqi@0 | 253 | |
aoqi@0 | 254 | // Top-of-stack operations. |
aoqi@0 | 255 | void set_type_at_tos(ciType* type) { set_type_at(tos(), type); } |
aoqi@0 | 256 | ciType* type_at_tos() const { return type_at(tos()); } |
aoqi@0 | 257 | |
aoqi@0 | 258 | void push(ciType* type) { |
aoqi@0 | 259 | _stack_size++; |
aoqi@0 | 260 | set_type_at_tos(type); |
aoqi@0 | 261 | } |
aoqi@0 | 262 | void pop() { |
aoqi@0 | 263 | debug_only(set_type_at_tos(bottom_type())); |
aoqi@0 | 264 | _stack_size--; |
aoqi@0 | 265 | } |
aoqi@0 | 266 | ciType* pop_value() { |
aoqi@0 | 267 | ciType* t = type_at_tos(); |
aoqi@0 | 268 | pop(); |
aoqi@0 | 269 | return t; |
aoqi@0 | 270 | } |
aoqi@0 | 271 | |
aoqi@0 | 272 | // Convenience operations. |
aoqi@0 | 273 | bool is_reference(ciType* type) const { |
aoqi@0 | 274 | return type == null_type() || !type->is_primitive_type(); |
aoqi@0 | 275 | } |
aoqi@0 | 276 | bool is_int(ciType* type) const { |
aoqi@0 | 277 | return type->basic_type() == T_INT; |
aoqi@0 | 278 | } |
aoqi@0 | 279 | bool is_long(ciType* type) const { |
aoqi@0 | 280 | return type->basic_type() == T_LONG; |
aoqi@0 | 281 | } |
aoqi@0 | 282 | bool is_float(ciType* type) const { |
aoqi@0 | 283 | return type->basic_type() == T_FLOAT; |
aoqi@0 | 284 | } |
aoqi@0 | 285 | bool is_double(ciType* type) const { |
aoqi@0 | 286 | return type->basic_type() == T_DOUBLE; |
aoqi@0 | 287 | } |
aoqi@0 | 288 | |
aoqi@0 | 289 | void store_to_local(int lnum) { |
aoqi@0 | 290 | _def_locals.add((uint) lnum); |
aoqi@0 | 291 | } |
aoqi@0 | 292 | |
aoqi@0 | 293 | void push_translate(ciType* type); |
aoqi@0 | 294 | |
aoqi@0 | 295 | void push_int() { |
aoqi@0 | 296 | push(ciType::make(T_INT)); |
aoqi@0 | 297 | } |
aoqi@0 | 298 | void pop_int() { |
aoqi@0 | 299 | assert(is_int(type_at_tos()), "must be integer"); |
aoqi@0 | 300 | pop(); |
aoqi@0 | 301 | } |
aoqi@0 | 302 | void check_int(Cell c) { |
aoqi@0 | 303 | assert(is_int(type_at(c)), "must be integer"); |
aoqi@0 | 304 | } |
aoqi@0 | 305 | void push_double() { |
aoqi@0 | 306 | push(ciType::make(T_DOUBLE)); |
aoqi@0 | 307 | push(double2_type()); |
aoqi@0 | 308 | } |
aoqi@0 | 309 | void pop_double() { |
aoqi@0 | 310 | assert(type_at_tos() == double2_type(), "must be 2nd half"); |
aoqi@0 | 311 | pop(); |
aoqi@0 | 312 | assert(is_double(type_at_tos()), "must be double"); |
aoqi@0 | 313 | pop(); |
aoqi@0 | 314 | } |
aoqi@0 | 315 | void push_float() { |
aoqi@0 | 316 | push(ciType::make(T_FLOAT)); |
aoqi@0 | 317 | } |
aoqi@0 | 318 | void pop_float() { |
aoqi@0 | 319 | assert(is_float(type_at_tos()), "must be float"); |
aoqi@0 | 320 | pop(); |
aoqi@0 | 321 | } |
aoqi@0 | 322 | void push_long() { |
aoqi@0 | 323 | push(ciType::make(T_LONG)); |
aoqi@0 | 324 | push(long2_type()); |
aoqi@0 | 325 | } |
aoqi@0 | 326 | void pop_long() { |
aoqi@0 | 327 | assert(type_at_tos() == long2_type(), "must be 2nd half"); |
aoqi@0 | 328 | pop(); |
aoqi@0 | 329 | assert(is_long(type_at_tos()), "must be long"); |
aoqi@0 | 330 | pop(); |
aoqi@0 | 331 | } |
aoqi@0 | 332 | void push_object(ciKlass* klass) { |
aoqi@0 | 333 | push(klass); |
aoqi@0 | 334 | } |
aoqi@0 | 335 | void pop_object() { |
aoqi@0 | 336 | assert(is_reference(type_at_tos()), "must be reference type"); |
aoqi@0 | 337 | pop(); |
aoqi@0 | 338 | } |
aoqi@0 | 339 | void pop_array() { |
aoqi@0 | 340 | assert(type_at_tos() == null_type() || |
aoqi@0 | 341 | type_at_tos()->is_array_klass(), "must be array type"); |
aoqi@0 | 342 | pop(); |
aoqi@0 | 343 | } |
aoqi@0 | 344 | // pop_objArray and pop_typeArray narrow the tos to ciObjArrayKlass |
aoqi@0 | 345 | // or ciTypeArrayKlass (resp.). In the rare case that an explicit |
aoqi@0 | 346 | // null is popped from the stack, we return NULL. Caller beware. |
aoqi@0 | 347 | ciObjArrayKlass* pop_objArray() { |
aoqi@0 | 348 | ciType* array = pop_value(); |
aoqi@0 | 349 | if (array == null_type()) return NULL; |
aoqi@0 | 350 | assert(array->is_obj_array_klass(), "must be object array type"); |
aoqi@0 | 351 | return array->as_obj_array_klass(); |
aoqi@0 | 352 | } |
aoqi@0 | 353 | ciTypeArrayKlass* pop_typeArray() { |
aoqi@0 | 354 | ciType* array = pop_value(); |
aoqi@0 | 355 | if (array == null_type()) return NULL; |
aoqi@0 | 356 | assert(array->is_type_array_klass(), "must be prim array type"); |
aoqi@0 | 357 | return array->as_type_array_klass(); |
aoqi@0 | 358 | } |
aoqi@0 | 359 | void push_null() { |
aoqi@0 | 360 | push(null_type()); |
aoqi@0 | 361 | } |
aoqi@0 | 362 | void do_null_assert(ciKlass* unloaded_klass); |
aoqi@0 | 363 | |
aoqi@0 | 364 | // Helper convenience routines. |
aoqi@0 | 365 | void do_aaload(ciBytecodeStream* str); |
aoqi@0 | 366 | void do_checkcast(ciBytecodeStream* str); |
aoqi@0 | 367 | void do_getfield(ciBytecodeStream* str); |
aoqi@0 | 368 | void do_getstatic(ciBytecodeStream* str); |
aoqi@0 | 369 | void do_invoke(ciBytecodeStream* str, bool has_receiver); |
aoqi@0 | 370 | void do_jsr(ciBytecodeStream* str); |
aoqi@0 | 371 | void do_ldc(ciBytecodeStream* str); |
aoqi@0 | 372 | void do_multianewarray(ciBytecodeStream* str); |
aoqi@0 | 373 | void do_new(ciBytecodeStream* str); |
aoqi@0 | 374 | void do_newarray(ciBytecodeStream* str); |
aoqi@0 | 375 | void do_putfield(ciBytecodeStream* str); |
aoqi@0 | 376 | void do_putstatic(ciBytecodeStream* str); |
aoqi@0 | 377 | void do_ret(ciBytecodeStream* str); |
aoqi@0 | 378 | |
aoqi@0 | 379 | void overwrite_local_double_long(int index) { |
aoqi@0 | 380 | // Invalidate the previous local if it contains first half of |
aoqi@0 | 381 | // a double or long value since it's seconf half is being overwritten. |
aoqi@0 | 382 | int prev_index = index - 1; |
aoqi@0 | 383 | if (prev_index >= 0 && |
aoqi@0 | 384 | (is_double(type_at(local(prev_index))) || |
aoqi@0 | 385 | is_long(type_at(local(prev_index))))) { |
aoqi@0 | 386 | set_type_at(local(prev_index), bottom_type()); |
aoqi@0 | 387 | } |
aoqi@0 | 388 | } |
aoqi@0 | 389 | |
aoqi@0 | 390 | void load_local_object(int index) { |
aoqi@0 | 391 | ciType* type = type_at(local(index)); |
aoqi@0 | 392 | assert(is_reference(type), "must be reference type"); |
aoqi@0 | 393 | push(type); |
aoqi@0 | 394 | } |
aoqi@0 | 395 | void store_local_object(int index) { |
aoqi@0 | 396 | ciType* type = pop_value(); |
aoqi@0 | 397 | assert(is_reference(type) || type->is_return_address(), |
aoqi@0 | 398 | "must be reference type or return address"); |
aoqi@0 | 399 | overwrite_local_double_long(index); |
aoqi@0 | 400 | set_type_at(local(index), type); |
aoqi@0 | 401 | store_to_local(index); |
aoqi@0 | 402 | } |
aoqi@0 | 403 | |
aoqi@0 | 404 | void load_local_double(int index) { |
aoqi@0 | 405 | ciType* type = type_at(local(index)); |
aoqi@0 | 406 | ciType* type2 = type_at(local(index+1)); |
aoqi@0 | 407 | assert(is_double(type), "must be double type"); |
aoqi@0 | 408 | assert(type2 == double2_type(), "must be 2nd half"); |
aoqi@0 | 409 | push(type); |
aoqi@0 | 410 | push(double2_type()); |
aoqi@0 | 411 | } |
aoqi@0 | 412 | void store_local_double(int index) { |
aoqi@0 | 413 | ciType* type2 = pop_value(); |
aoqi@0 | 414 | ciType* type = pop_value(); |
aoqi@0 | 415 | assert(is_double(type), "must be double"); |
aoqi@0 | 416 | assert(type2 == double2_type(), "must be 2nd half"); |
aoqi@0 | 417 | overwrite_local_double_long(index); |
aoqi@0 | 418 | set_type_at(local(index), type); |
aoqi@0 | 419 | set_type_at(local(index+1), type2); |
aoqi@0 | 420 | store_to_local(index); |
aoqi@0 | 421 | store_to_local(index+1); |
aoqi@0 | 422 | } |
aoqi@0 | 423 | |
aoqi@0 | 424 | void load_local_float(int index) { |
aoqi@0 | 425 | ciType* type = type_at(local(index)); |
aoqi@0 | 426 | assert(is_float(type), "must be float type"); |
aoqi@0 | 427 | push(type); |
aoqi@0 | 428 | } |
aoqi@0 | 429 | void store_local_float(int index) { |
aoqi@0 | 430 | ciType* type = pop_value(); |
aoqi@0 | 431 | assert(is_float(type), "must be float type"); |
aoqi@0 | 432 | overwrite_local_double_long(index); |
aoqi@0 | 433 | set_type_at(local(index), type); |
aoqi@0 | 434 | store_to_local(index); |
aoqi@0 | 435 | } |
aoqi@0 | 436 | |
aoqi@0 | 437 | void load_local_int(int index) { |
aoqi@0 | 438 | ciType* type = type_at(local(index)); |
aoqi@0 | 439 | assert(is_int(type), "must be int type"); |
aoqi@0 | 440 | push(type); |
aoqi@0 | 441 | } |
aoqi@0 | 442 | void store_local_int(int index) { |
aoqi@0 | 443 | ciType* type = pop_value(); |
aoqi@0 | 444 | assert(is_int(type), "must be int type"); |
aoqi@0 | 445 | overwrite_local_double_long(index); |
aoqi@0 | 446 | set_type_at(local(index), type); |
aoqi@0 | 447 | store_to_local(index); |
aoqi@0 | 448 | } |
aoqi@0 | 449 | |
aoqi@0 | 450 | void load_local_long(int index) { |
aoqi@0 | 451 | ciType* type = type_at(local(index)); |
aoqi@0 | 452 | ciType* type2 = type_at(local(index+1)); |
aoqi@0 | 453 | assert(is_long(type), "must be long type"); |
aoqi@0 | 454 | assert(type2 == long2_type(), "must be 2nd half"); |
aoqi@0 | 455 | push(type); |
aoqi@0 | 456 | push(long2_type()); |
aoqi@0 | 457 | } |
aoqi@0 | 458 | void store_local_long(int index) { |
aoqi@0 | 459 | ciType* type2 = pop_value(); |
aoqi@0 | 460 | ciType* type = pop_value(); |
aoqi@0 | 461 | assert(is_long(type), "must be long"); |
aoqi@0 | 462 | assert(type2 == long2_type(), "must be 2nd half"); |
aoqi@0 | 463 | overwrite_local_double_long(index); |
aoqi@0 | 464 | set_type_at(local(index), type); |
aoqi@0 | 465 | set_type_at(local(index+1), type2); |
aoqi@0 | 466 | store_to_local(index); |
aoqi@0 | 467 | store_to_local(index+1); |
aoqi@0 | 468 | } |
aoqi@0 | 469 | |
aoqi@0 | 470 | // Stop interpretation of this path with a trap. |
aoqi@0 | 471 | void trap(ciBytecodeStream* str, ciKlass* klass, int index); |
aoqi@0 | 472 | |
aoqi@0 | 473 | public: |
aoqi@0 | 474 | StateVector(ciTypeFlow* outer); |
aoqi@0 | 475 | |
aoqi@0 | 476 | // Copy our value into some other StateVector |
aoqi@0 | 477 | void copy_into(StateVector* copy) const; |
aoqi@0 | 478 | |
aoqi@0 | 479 | // Meets this StateVector with another, destructively modifying this |
aoqi@0 | 480 | // one. Returns true if any modification takes place. |
aoqi@0 | 481 | bool meet(const StateVector* incoming); |
aoqi@0 | 482 | |
aoqi@0 | 483 | // Ditto, except that the incoming state is coming from an exception. |
aoqi@0 | 484 | bool meet_exception(ciInstanceKlass* exc, const StateVector* incoming); |
aoqi@0 | 485 | |
aoqi@0 | 486 | // Apply the effect of one bytecode to this StateVector |
aoqi@0 | 487 | bool apply_one_bytecode(ciBytecodeStream* stream); |
aoqi@0 | 488 | |
aoqi@0 | 489 | // What is the bci of the trap? |
aoqi@0 | 490 | int trap_bci() { return _trap_bci; } |
aoqi@0 | 491 | |
aoqi@0 | 492 | // What is the index associated with the trap? |
aoqi@0 | 493 | int trap_index() { return _trap_index; } |
aoqi@0 | 494 | |
aoqi@0 | 495 | void print_cell_on(outputStream* st, Cell c) const PRODUCT_RETURN; |
aoqi@0 | 496 | void print_on(outputStream* st) const PRODUCT_RETURN; |
aoqi@0 | 497 | }; |
aoqi@0 | 498 | |
aoqi@0 | 499 | // Parameter for "find_block" calls: |
aoqi@0 | 500 | // Describes the difference between a public and backedge copy. |
aoqi@0 | 501 | enum CreateOption { |
aoqi@0 | 502 | create_public_copy, |
aoqi@0 | 503 | create_backedge_copy, |
aoqi@0 | 504 | no_create |
aoqi@0 | 505 | }; |
aoqi@0 | 506 | |
aoqi@0 | 507 | // Successor iterator |
aoqi@0 | 508 | class SuccIter : public StackObj { |
aoqi@0 | 509 | private: |
aoqi@0 | 510 | Block* _pred; |
aoqi@0 | 511 | int _index; |
aoqi@0 | 512 | Block* _succ; |
aoqi@0 | 513 | public: |
aoqi@0 | 514 | SuccIter() : _pred(NULL), _index(-1), _succ(NULL) {} |
aoqi@0 | 515 | SuccIter(Block* pred) : _pred(pred), _index(-1), _succ(NULL) { next(); } |
aoqi@0 | 516 | int index() { return _index; } |
aoqi@0 | 517 | Block* pred() { return _pred; } // Return predecessor |
aoqi@0 | 518 | bool done() { return _index < 0; } // Finished? |
aoqi@0 | 519 | Block* succ() { return _succ; } // Return current successor |
aoqi@0 | 520 | void next(); // Advance |
aoqi@0 | 521 | void set_succ(Block* succ); // Update current successor |
aoqi@0 | 522 | bool is_normal_ctrl() { return index() < _pred->successors()->length(); } |
aoqi@0 | 523 | }; |
aoqi@0 | 524 | |
aoqi@0 | 525 | // A basic block |
aoqi@0 | 526 | class Block : public ResourceObj { |
aoqi@0 | 527 | private: |
aoqi@0 | 528 | ciBlock* _ciblock; |
aoqi@0 | 529 | GrowableArray<Block*>* _exceptions; |
aoqi@0 | 530 | GrowableArray<ciInstanceKlass*>* _exc_klasses; |
aoqi@0 | 531 | GrowableArray<Block*>* _successors; |
aoqi@0 | 532 | StateVector* _state; |
aoqi@0 | 533 | JsrSet* _jsrs; |
aoqi@0 | 534 | |
aoqi@0 | 535 | int _trap_bci; |
aoqi@0 | 536 | int _trap_index; |
aoqi@0 | 537 | |
aoqi@0 | 538 | // pre_order, assigned at first visit. Used as block ID and "visited" tag |
aoqi@0 | 539 | int _pre_order; |
aoqi@0 | 540 | |
aoqi@0 | 541 | // A post-order, used to compute the reverse post order (RPO) provided to the client |
aoqi@0 | 542 | int _post_order; // used to compute rpo |
aoqi@0 | 543 | |
aoqi@0 | 544 | // Has this block been cloned for a loop backedge? |
aoqi@0 | 545 | bool _backedge_copy; |
aoqi@0 | 546 | |
aoqi@0 | 547 | // This block is entry to irreducible loop. |
aoqi@0 | 548 | bool _irreducible_entry; |
aoqi@0 | 549 | |
aoqi@0 | 550 | // This block has monitor entry point. |
aoqi@0 | 551 | bool _has_monitorenter; |
aoqi@0 | 552 | |
aoqi@0 | 553 | // A pointer used for our internal work list |
aoqi@0 | 554 | bool _on_work_list; // on the work list |
aoqi@0 | 555 | Block* _next; |
aoqi@0 | 556 | Block* _rpo_next; // Reverse post order list |
aoqi@0 | 557 | |
aoqi@0 | 558 | // Loop info |
aoqi@0 | 559 | Loop* _loop; // nearest loop |
aoqi@0 | 560 | |
aoqi@0 | 561 | ciBlock* ciblock() const { return _ciblock; } |
aoqi@0 | 562 | StateVector* state() const { return _state; } |
aoqi@0 | 563 | |
aoqi@0 | 564 | // Compute the exceptional successors and types for this Block. |
aoqi@0 | 565 | void compute_exceptions(); |
aoqi@0 | 566 | |
aoqi@0 | 567 | public: |
aoqi@0 | 568 | // constructors |
aoqi@0 | 569 | Block(ciTypeFlow* outer, ciBlock* ciblk, JsrSet* jsrs); |
aoqi@0 | 570 | |
aoqi@0 | 571 | void set_trap(int trap_bci, int trap_index) { |
aoqi@0 | 572 | _trap_bci = trap_bci; |
aoqi@0 | 573 | _trap_index = trap_index; |
aoqi@0 | 574 | assert(has_trap(), ""); |
aoqi@0 | 575 | } |
aoqi@0 | 576 | bool has_trap() const { return _trap_bci != -1; } |
aoqi@0 | 577 | int trap_bci() const { assert(has_trap(), ""); return _trap_bci; } |
aoqi@0 | 578 | int trap_index() const { assert(has_trap(), ""); return _trap_index; } |
aoqi@0 | 579 | |
aoqi@0 | 580 | // accessors |
aoqi@0 | 581 | ciTypeFlow* outer() const { return state()->outer(); } |
aoqi@0 | 582 | int start() const { return _ciblock->start_bci(); } |
aoqi@0 | 583 | int limit() const { return _ciblock->limit_bci(); } |
aoqi@0 | 584 | int control() const { return _ciblock->control_bci(); } |
aoqi@0 | 585 | JsrSet* jsrs() const { return _jsrs; } |
aoqi@0 | 586 | |
aoqi@0 | 587 | bool is_backedge_copy() const { return _backedge_copy; } |
aoqi@0 | 588 | void set_backedge_copy(bool z); |
aoqi@0 | 589 | int backedge_copy_count() const { return outer()->backedge_copy_count(ciblock()->index(), _jsrs); } |
aoqi@0 | 590 | |
aoqi@0 | 591 | // access to entry state |
aoqi@0 | 592 | int stack_size() const { return _state->stack_size(); } |
aoqi@0 | 593 | int monitor_count() const { return _state->monitor_count(); } |
aoqi@0 | 594 | ciType* local_type_at(int i) const { return _state->local_type_at(i); } |
aoqi@0 | 595 | ciType* stack_type_at(int i) const { return _state->stack_type_at(i); } |
aoqi@0 | 596 | |
aoqi@0 | 597 | // Data flow on locals |
aoqi@0 | 598 | bool is_invariant_local(uint v) const { |
aoqi@0 | 599 | assert(is_loop_head(), "only loop heads"); |
aoqi@0 | 600 | // Find outermost loop with same loop head |
aoqi@0 | 601 | Loop* lp = loop(); |
aoqi@0 | 602 | while (lp->parent() != NULL) { |
aoqi@0 | 603 | if (lp->parent()->head() != lp->head()) break; |
aoqi@0 | 604 | lp = lp->parent(); |
aoqi@0 | 605 | } |
aoqi@0 | 606 | return !lp->def_locals()->test(v); |
aoqi@0 | 607 | } |
aoqi@0 | 608 | LocalSet* def_locals() { return _state->def_locals(); } |
aoqi@0 | 609 | const LocalSet* def_locals() const { return _state->def_locals(); } |
aoqi@0 | 610 | |
aoqi@0 | 611 | // Get the successors for this Block. |
aoqi@0 | 612 | GrowableArray<Block*>* successors(ciBytecodeStream* str, |
aoqi@0 | 613 | StateVector* state, |
aoqi@0 | 614 | JsrSet* jsrs); |
aoqi@0 | 615 | GrowableArray<Block*>* successors() { |
aoqi@0 | 616 | assert(_successors != NULL, "must be filled in"); |
aoqi@0 | 617 | return _successors; |
aoqi@0 | 618 | } |
aoqi@0 | 619 | |
aoqi@0 | 620 | // Get the exceptional successors for this Block. |
aoqi@0 | 621 | GrowableArray<Block*>* exceptions() { |
aoqi@0 | 622 | if (_exceptions == NULL) { |
aoqi@0 | 623 | compute_exceptions(); |
aoqi@0 | 624 | } |
aoqi@0 | 625 | return _exceptions; |
aoqi@0 | 626 | } |
aoqi@0 | 627 | |
aoqi@0 | 628 | // Get the exception klasses corresponding to the |
aoqi@0 | 629 | // exceptional successors for this Block. |
aoqi@0 | 630 | GrowableArray<ciInstanceKlass*>* exc_klasses() { |
aoqi@0 | 631 | if (_exc_klasses == NULL) { |
aoqi@0 | 632 | compute_exceptions(); |
aoqi@0 | 633 | } |
aoqi@0 | 634 | return _exc_klasses; |
aoqi@0 | 635 | } |
aoqi@0 | 636 | |
aoqi@0 | 637 | // Is this Block compatible with a given JsrSet? |
aoqi@0 | 638 | bool is_compatible_with(JsrSet* other) { |
aoqi@0 | 639 | return _jsrs->is_compatible_with(other); |
aoqi@0 | 640 | } |
aoqi@0 | 641 | |
aoqi@0 | 642 | // Copy the value of our state vector into another. |
aoqi@0 | 643 | void copy_state_into(StateVector* copy) const { |
aoqi@0 | 644 | _state->copy_into(copy); |
aoqi@0 | 645 | } |
aoqi@0 | 646 | |
aoqi@0 | 647 | // Copy the value of our JsrSet into another |
aoqi@0 | 648 | void copy_jsrs_into(JsrSet* copy) const { |
aoqi@0 | 649 | _jsrs->copy_into(copy); |
aoqi@0 | 650 | } |
aoqi@0 | 651 | |
aoqi@0 | 652 | // Meets the start state of this block with another state, destructively |
aoqi@0 | 653 | // modifying this one. Returns true if any modification takes place. |
aoqi@0 | 654 | bool meet(const StateVector* incoming) { |
aoqi@0 | 655 | return state()->meet(incoming); |
aoqi@0 | 656 | } |
aoqi@0 | 657 | |
aoqi@0 | 658 | // Ditto, except that the incoming state is coming from an |
aoqi@0 | 659 | // exception path. This means the stack is replaced by the |
aoqi@0 | 660 | // appropriate exception type. |
aoqi@0 | 661 | bool meet_exception(ciInstanceKlass* exc, const StateVector* incoming) { |
aoqi@0 | 662 | return state()->meet_exception(exc, incoming); |
aoqi@0 | 663 | } |
aoqi@0 | 664 | |
aoqi@0 | 665 | // Work list manipulation |
aoqi@0 | 666 | void set_next(Block* block) { _next = block; } |
aoqi@0 | 667 | Block* next() const { return _next; } |
aoqi@0 | 668 | |
aoqi@0 | 669 | void set_on_work_list(bool c) { _on_work_list = c; } |
aoqi@0 | 670 | bool is_on_work_list() const { return _on_work_list; } |
aoqi@0 | 671 | |
aoqi@0 | 672 | bool has_pre_order() const { return _pre_order >= 0; } |
aoqi@0 | 673 | void set_pre_order(int po) { assert(!has_pre_order(), ""); _pre_order = po; } |
aoqi@0 | 674 | int pre_order() const { assert(has_pre_order(), ""); return _pre_order; } |
aoqi@0 | 675 | void set_next_pre_order() { set_pre_order(outer()->inc_next_pre_order()); } |
aoqi@0 | 676 | bool is_start() const { return _pre_order == outer()->start_block_num(); } |
aoqi@0 | 677 | |
aoqi@0 | 678 | // Reverse post order |
aoqi@0 | 679 | void df_init(); |
aoqi@0 | 680 | bool has_post_order() const { return _post_order >= 0; } |
aoqi@0 | 681 | void set_post_order(int po) { assert(!has_post_order() && po >= 0, ""); _post_order = po; } |
aoqi@0 | 682 | void reset_post_order(int o){ _post_order = o; } |
aoqi@0 | 683 | int post_order() const { assert(has_post_order(), ""); return _post_order; } |
aoqi@0 | 684 | |
aoqi@0 | 685 | bool has_rpo() const { return has_post_order() && outer()->have_block_count(); } |
aoqi@0 | 686 | int rpo() const { assert(has_rpo(), ""); return outer()->block_count() - post_order() - 1; } |
aoqi@0 | 687 | void set_rpo_next(Block* b) { _rpo_next = b; } |
aoqi@0 | 688 | Block* rpo_next() { return _rpo_next; } |
aoqi@0 | 689 | |
aoqi@0 | 690 | // Loops |
aoqi@0 | 691 | Loop* loop() const { return _loop; } |
aoqi@0 | 692 | void set_loop(Loop* lp) { _loop = lp; } |
aoqi@0 | 693 | bool is_loop_head() const { return _loop && _loop->head() == this; } |
aoqi@0 | 694 | void set_irreducible_entry(bool c) { _irreducible_entry = c; } |
aoqi@0 | 695 | bool is_irreducible_entry() const { return _irreducible_entry; } |
aoqi@0 | 696 | void set_has_monitorenter() { _has_monitorenter = true; } |
aoqi@0 | 697 | bool has_monitorenter() const { return _has_monitorenter; } |
aoqi@0 | 698 | bool is_visited() const { return has_pre_order(); } |
aoqi@0 | 699 | bool is_post_visited() const { return has_post_order(); } |
aoqi@0 | 700 | bool is_clonable_exit(Loop* lp); |
aoqi@0 | 701 | Block* looping_succ(Loop* lp); // Successor inside of loop |
aoqi@0 | 702 | bool is_single_entry_loop_head() const { |
aoqi@0 | 703 | if (!is_loop_head()) return false; |
aoqi@0 | 704 | for (Loop* lp = loop(); lp != NULL && lp->head() == this; lp = lp->parent()) |
aoqi@0 | 705 | if (lp->is_irreducible()) return false; |
aoqi@0 | 706 | return true; |
aoqi@0 | 707 | } |
aoqi@0 | 708 | |
aoqi@0 | 709 | void print_value_on(outputStream* st) const PRODUCT_RETURN; |
aoqi@0 | 710 | void print_on(outputStream* st) const PRODUCT_RETURN; |
aoqi@0 | 711 | }; |
aoqi@0 | 712 | |
aoqi@0 | 713 | // Loop |
aoqi@0 | 714 | class Loop : public ResourceObj { |
aoqi@0 | 715 | private: |
aoqi@0 | 716 | Loop* _parent; |
aoqi@0 | 717 | Loop* _sibling; // List of siblings, null terminated |
aoqi@0 | 718 | Loop* _child; // Head of child list threaded thru sibling pointer |
aoqi@0 | 719 | Block* _head; // Head of loop |
aoqi@0 | 720 | Block* _tail; // Tail of loop |
aoqi@0 | 721 | bool _irreducible; |
aoqi@0 | 722 | LocalSet _def_locals; |
aoqi@0 | 723 | |
aoqi@0 | 724 | public: |
aoqi@0 | 725 | Loop(Block* head, Block* tail) : |
aoqi@0 | 726 | _head(head), _tail(tail), |
aoqi@0 | 727 | _parent(NULL), _sibling(NULL), _child(NULL), |
aoqi@0 | 728 | _irreducible(false), _def_locals() {} |
aoqi@0 | 729 | |
aoqi@0 | 730 | Loop* parent() const { return _parent; } |
aoqi@0 | 731 | Loop* sibling() const { return _sibling; } |
aoqi@0 | 732 | Loop* child() const { return _child; } |
aoqi@0 | 733 | Block* head() const { return _head; } |
aoqi@0 | 734 | Block* tail() const { return _tail; } |
aoqi@0 | 735 | void set_parent(Loop* p) { _parent = p; } |
aoqi@0 | 736 | void set_sibling(Loop* s) { _sibling = s; } |
aoqi@0 | 737 | void set_child(Loop* c) { _child = c; } |
aoqi@0 | 738 | void set_head(Block* hd) { _head = hd; } |
aoqi@0 | 739 | void set_tail(Block* tl) { _tail = tl; } |
aoqi@0 | 740 | |
aoqi@0 | 741 | int depth() const; // nesting depth |
aoqi@0 | 742 | |
aoqi@0 | 743 | // Returns true if lp is a nested loop or us. |
aoqi@0 | 744 | bool contains(Loop* lp) const; |
aoqi@0 | 745 | bool contains(Block* blk) const { return contains(blk->loop()); } |
aoqi@0 | 746 | |
aoqi@0 | 747 | // Data flow on locals |
aoqi@0 | 748 | LocalSet* def_locals() { return &_def_locals; } |
aoqi@0 | 749 | const LocalSet* def_locals() const { return &_def_locals; } |
aoqi@0 | 750 | |
aoqi@0 | 751 | // Merge the branch lp into this branch, sorting on the loop head |
aoqi@0 | 752 | // pre_orders. Returns the new branch. |
aoqi@0 | 753 | Loop* sorted_merge(Loop* lp); |
aoqi@0 | 754 | |
aoqi@0 | 755 | // Mark non-single entry to loop |
aoqi@0 | 756 | void set_irreducible(Block* entry) { |
aoqi@0 | 757 | _irreducible = true; |
aoqi@0 | 758 | entry->set_irreducible_entry(true); |
aoqi@0 | 759 | } |
aoqi@0 | 760 | bool is_irreducible() const { return _irreducible; } |
aoqi@0 | 761 | |
aoqi@0 | 762 | bool is_root() const { return _tail->pre_order() == max_jint; } |
aoqi@0 | 763 | |
aoqi@0 | 764 | void print(outputStream* st = tty, int indent = 0) const PRODUCT_RETURN; |
aoqi@0 | 765 | }; |
aoqi@0 | 766 | |
aoqi@0 | 767 | // Postorder iteration over the loop tree. |
aoqi@0 | 768 | class PostorderLoops : public StackObj { |
aoqi@0 | 769 | private: |
aoqi@0 | 770 | Loop* _root; |
aoqi@0 | 771 | Loop* _current; |
aoqi@0 | 772 | public: |
aoqi@0 | 773 | PostorderLoops(Loop* root) : _root(root), _current(root) { |
aoqi@0 | 774 | while (_current->child() != NULL) { |
aoqi@0 | 775 | _current = _current->child(); |
aoqi@0 | 776 | } |
aoqi@0 | 777 | } |
aoqi@0 | 778 | bool done() { return _current == NULL; } // Finished iterating? |
aoqi@0 | 779 | void next(); // Advance to next loop |
aoqi@0 | 780 | Loop* current() { return _current; } // Return current loop. |
aoqi@0 | 781 | }; |
aoqi@0 | 782 | |
aoqi@0 | 783 | // Preorder iteration over the loop tree. |
aoqi@0 | 784 | class PreorderLoops : public StackObj { |
aoqi@0 | 785 | private: |
aoqi@0 | 786 | Loop* _root; |
aoqi@0 | 787 | Loop* _current; |
aoqi@0 | 788 | public: |
aoqi@0 | 789 | PreorderLoops(Loop* root) : _root(root), _current(root) {} |
aoqi@0 | 790 | bool done() { return _current == NULL; } // Finished iterating? |
aoqi@0 | 791 | void next(); // Advance to next loop |
aoqi@0 | 792 | Loop* current() { return _current; } // Return current loop. |
aoqi@0 | 793 | }; |
aoqi@0 | 794 | |
aoqi@0 | 795 | // Standard indexes of successors, for various bytecodes. |
aoqi@0 | 796 | enum { |
aoqi@0 | 797 | FALL_THROUGH = 0, // normal control |
aoqi@0 | 798 | IF_NOT_TAKEN = 0, // the not-taken branch of an if (i.e., fall-through) |
aoqi@0 | 799 | IF_TAKEN = 1, // the taken branch of an if |
aoqi@0 | 800 | GOTO_TARGET = 0, // unique successor for goto, jsr, or ret |
aoqi@0 | 801 | SWITCH_DEFAULT = 0, // default branch of a switch |
aoqi@0 | 802 | SWITCH_CASES = 1 // first index for any non-default switch branches |
aoqi@0 | 803 | // Unlike in other blocks, the successors of a switch are listed uniquely. |
aoqi@0 | 804 | }; |
aoqi@0 | 805 | |
aoqi@0 | 806 | private: |
aoqi@0 | 807 | // A mapping from pre_order to Blocks. This array is created |
aoqi@0 | 808 | // only at the end of the flow. |
aoqi@0 | 809 | Block** _block_map; |
aoqi@0 | 810 | |
aoqi@0 | 811 | // For each ciBlock index, a list of Blocks which share this ciBlock. |
aoqi@0 | 812 | GrowableArray<Block*>** _idx_to_blocklist; |
aoqi@0 | 813 | // count of ciBlocks |
aoqi@0 | 814 | int _ciblock_count; |
aoqi@0 | 815 | |
aoqi@0 | 816 | // Tells if a given instruction is able to generate an exception edge. |
aoqi@0 | 817 | bool can_trap(ciBytecodeStream& str); |
aoqi@0 | 818 | |
aoqi@0 | 819 | // Clone the loop heads. Returns true if any cloning occurred. |
aoqi@0 | 820 | bool clone_loop_heads(Loop* lp, StateVector* temp_vector, JsrSet* temp_set); |
aoqi@0 | 821 | |
aoqi@0 | 822 | // Clone lp's head and replace tail's successors with clone. |
aoqi@0 | 823 | Block* clone_loop_head(Loop* lp, StateVector* temp_vector, JsrSet* temp_set); |
aoqi@0 | 824 | |
aoqi@0 | 825 | public: |
aoqi@0 | 826 | // Return the block beginning at bci which has a JsrSet compatible |
aoqi@0 | 827 | // with jsrs. |
aoqi@0 | 828 | Block* block_at(int bci, JsrSet* set, CreateOption option = create_public_copy); |
aoqi@0 | 829 | |
aoqi@0 | 830 | // block factory |
aoqi@0 | 831 | Block* get_block_for(int ciBlockIndex, JsrSet* jsrs, CreateOption option = create_public_copy); |
aoqi@0 | 832 | |
aoqi@0 | 833 | // How many of the blocks have the backedge_copy bit set? |
aoqi@0 | 834 | int backedge_copy_count(int ciBlockIndex, JsrSet* jsrs) const; |
aoqi@0 | 835 | |
aoqi@0 | 836 | // Return an existing block containing bci which has a JsrSet compatible |
aoqi@0 | 837 | // with jsrs, or NULL if there is none. |
aoqi@0 | 838 | Block* existing_block_at(int bci, JsrSet* set) { return block_at(bci, set, no_create); } |
aoqi@0 | 839 | |
aoqi@0 | 840 | // Tell whether the flow analysis has encountered an error of some sort. |
aoqi@0 | 841 | bool failing() { return env()->failing() || _failure_reason != NULL; } |
aoqi@0 | 842 | |
aoqi@0 | 843 | // Reason this compilation is failing, such as "too many basic blocks". |
aoqi@0 | 844 | const char* failure_reason() { return _failure_reason; } |
aoqi@0 | 845 | |
aoqi@0 | 846 | // Note a failure. |
aoqi@0 | 847 | void record_failure(const char* reason); |
aoqi@0 | 848 | |
aoqi@0 | 849 | // Return the block of a given pre-order number. |
aoqi@0 | 850 | int have_block_count() const { return _block_map != NULL; } |
aoqi@0 | 851 | int block_count() const { assert(have_block_count(), ""); |
aoqi@0 | 852 | return _next_pre_order; } |
aoqi@0 | 853 | Block* pre_order_at(int po) const { assert(0 <= po && po < block_count(), "out of bounds"); |
aoqi@0 | 854 | return _block_map[po]; } |
aoqi@0 | 855 | Block* start_block() const { return pre_order_at(start_block_num()); } |
aoqi@0 | 856 | int start_block_num() const { return 0; } |
aoqi@0 | 857 | Block* rpo_at(int rpo) const { assert(0 <= rpo && rpo < block_count(), "out of bounds"); |
aoqi@0 | 858 | return _block_map[rpo]; } |
aoqi@0 | 859 | int next_pre_order() { return _next_pre_order; } |
aoqi@0 | 860 | int inc_next_pre_order() { return _next_pre_order++; } |
aoqi@0 | 861 | |
aoqi@0 | 862 | private: |
aoqi@0 | 863 | // A work list used during flow analysis. |
aoqi@0 | 864 | Block* _work_list; |
aoqi@0 | 865 | |
aoqi@0 | 866 | // List of blocks in reverse post order |
aoqi@0 | 867 | Block* _rpo_list; |
aoqi@0 | 868 | |
aoqi@0 | 869 | // Next Block::_pre_order. After mapping, doubles as block_count. |
aoqi@0 | 870 | int _next_pre_order; |
aoqi@0 | 871 | |
aoqi@0 | 872 | // Are there more blocks on the work list? |
aoqi@0 | 873 | bool work_list_empty() { return _work_list == NULL; } |
aoqi@0 | 874 | |
aoqi@0 | 875 | // Get the next basic block from our work list. |
aoqi@0 | 876 | Block* work_list_next(); |
aoqi@0 | 877 | |
aoqi@0 | 878 | // Add a basic block to our work list. |
aoqi@0 | 879 | void add_to_work_list(Block* block); |
aoqi@0 | 880 | |
aoqi@0 | 881 | // Prepend a basic block to rpo list. |
aoqi@0 | 882 | void prepend_to_rpo_list(Block* blk) { |
aoqi@0 | 883 | blk->set_rpo_next(_rpo_list); |
aoqi@0 | 884 | _rpo_list = blk; |
aoqi@0 | 885 | } |
aoqi@0 | 886 | |
aoqi@0 | 887 | // Root of the loop tree |
aoqi@0 | 888 | Loop* _loop_tree_root; |
aoqi@0 | 889 | |
aoqi@0 | 890 | // State used for make_jsr_record |
aoqi@0 | 891 | int _jsr_count; |
aoqi@0 | 892 | GrowableArray<JsrRecord*>* _jsr_records; |
aoqi@0 | 893 | |
aoqi@0 | 894 | public: |
aoqi@0 | 895 | // Make a JsrRecord for a given (entry, return) pair, if such a record |
aoqi@0 | 896 | // does not already exist. |
aoqi@0 | 897 | JsrRecord* make_jsr_record(int entry_address, int return_address); |
aoqi@0 | 898 | |
aoqi@0 | 899 | void set_loop_tree_root(Loop* ltr) { _loop_tree_root = ltr; } |
aoqi@0 | 900 | Loop* loop_tree_root() { return _loop_tree_root; } |
aoqi@0 | 901 | |
aoqi@0 | 902 | private: |
aoqi@0 | 903 | // Get the initial state for start_bci: |
aoqi@0 | 904 | const StateVector* get_start_state(); |
aoqi@0 | 905 | |
aoqi@0 | 906 | // Merge the current state into all exceptional successors at the |
aoqi@0 | 907 | // current point in the code. |
aoqi@0 | 908 | void flow_exceptions(GrowableArray<Block*>* exceptions, |
aoqi@0 | 909 | GrowableArray<ciInstanceKlass*>* exc_klasses, |
aoqi@0 | 910 | StateVector* state); |
aoqi@0 | 911 | |
aoqi@0 | 912 | // Merge the current state into all successors at the current point |
aoqi@0 | 913 | // in the code. |
aoqi@0 | 914 | void flow_successors(GrowableArray<Block*>* successors, |
aoqi@0 | 915 | StateVector* state); |
aoqi@0 | 916 | |
aoqi@0 | 917 | // Interpret the effects of the bytecodes on the incoming state |
aoqi@0 | 918 | // vector of a basic block. Push the changed state to succeeding |
aoqi@0 | 919 | // basic blocks. |
aoqi@0 | 920 | void flow_block(Block* block, |
aoqi@0 | 921 | StateVector* scratch_state, |
aoqi@0 | 922 | JsrSet* scratch_jsrs); |
aoqi@0 | 923 | |
aoqi@0 | 924 | // Perform the type flow analysis, creating and cloning Blocks as |
aoqi@0 | 925 | // necessary. |
aoqi@0 | 926 | void flow_types(); |
aoqi@0 | 927 | |
aoqi@0 | 928 | // Perform the depth first type flow analysis. Helper for flow_types. |
aoqi@0 | 929 | void df_flow_types(Block* start, |
aoqi@0 | 930 | bool do_flow, |
aoqi@0 | 931 | StateVector* temp_vector, |
aoqi@0 | 932 | JsrSet* temp_set); |
aoqi@0 | 933 | |
aoqi@0 | 934 | // Incrementally build loop tree. |
aoqi@0 | 935 | void build_loop_tree(Block* blk); |
aoqi@0 | 936 | |
aoqi@0 | 937 | // Create the block map, which indexes blocks in pre_order. |
aoqi@0 | 938 | void map_blocks(); |
aoqi@0 | 939 | |
aoqi@0 | 940 | public: |
aoqi@0 | 941 | // Perform type inference flow analysis. |
aoqi@0 | 942 | void do_flow(); |
aoqi@0 | 943 | |
aoqi@0 | 944 | void print_on(outputStream* st) const PRODUCT_RETURN; |
aoqi@0 | 945 | |
aoqi@0 | 946 | void rpo_print_on(outputStream* st) const PRODUCT_RETURN; |
aoqi@0 | 947 | }; |
aoqi@0 | 948 | |
aoqi@0 | 949 | #endif // SHARE_VM_CI_CITYPEFLOW_HPP |