Sat, 01 Dec 2007 00:00:00 +0000
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duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 1999-2006 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 | # include "incls/_precompiled.incl" |
duke@435 | 26 | # include "incls/_c1_IR.cpp.incl" |
duke@435 | 27 | |
duke@435 | 28 | |
duke@435 | 29 | // Implementation of XHandlers |
duke@435 | 30 | // |
duke@435 | 31 | // Note: This code could eventually go away if we are |
duke@435 | 32 | // just using the ciExceptionHandlerStream. |
duke@435 | 33 | |
duke@435 | 34 | XHandlers::XHandlers(ciMethod* method) : _list(method->exception_table_length()) { |
duke@435 | 35 | ciExceptionHandlerStream s(method); |
duke@435 | 36 | while (!s.is_done()) { |
duke@435 | 37 | _list.append(new XHandler(s.handler())); |
duke@435 | 38 | s.next(); |
duke@435 | 39 | } |
duke@435 | 40 | assert(s.count() == method->exception_table_length(), "exception table lengths inconsistent"); |
duke@435 | 41 | } |
duke@435 | 42 | |
duke@435 | 43 | // deep copy of all XHandler contained in list |
duke@435 | 44 | XHandlers::XHandlers(XHandlers* other) : |
duke@435 | 45 | _list(other->length()) |
duke@435 | 46 | { |
duke@435 | 47 | for (int i = 0; i < other->length(); i++) { |
duke@435 | 48 | _list.append(new XHandler(other->handler_at(i))); |
duke@435 | 49 | } |
duke@435 | 50 | } |
duke@435 | 51 | |
duke@435 | 52 | // Returns whether a particular exception type can be caught. Also |
duke@435 | 53 | // returns true if klass is unloaded or any exception handler |
duke@435 | 54 | // classes are unloaded. type_is_exact indicates whether the throw |
duke@435 | 55 | // is known to be exactly that class or it might throw a subtype. |
duke@435 | 56 | bool XHandlers::could_catch(ciInstanceKlass* klass, bool type_is_exact) const { |
duke@435 | 57 | // the type is unknown so be conservative |
duke@435 | 58 | if (!klass->is_loaded()) { |
duke@435 | 59 | return true; |
duke@435 | 60 | } |
duke@435 | 61 | |
duke@435 | 62 | for (int i = 0; i < length(); i++) { |
duke@435 | 63 | XHandler* handler = handler_at(i); |
duke@435 | 64 | if (handler->is_catch_all()) { |
duke@435 | 65 | // catch of ANY |
duke@435 | 66 | return true; |
duke@435 | 67 | } |
duke@435 | 68 | ciInstanceKlass* handler_klass = handler->catch_klass(); |
duke@435 | 69 | // if it's unknown it might be catchable |
duke@435 | 70 | if (!handler_klass->is_loaded()) { |
duke@435 | 71 | return true; |
duke@435 | 72 | } |
duke@435 | 73 | // if the throw type is definitely a subtype of the catch type |
duke@435 | 74 | // then it can be caught. |
duke@435 | 75 | if (klass->is_subtype_of(handler_klass)) { |
duke@435 | 76 | return true; |
duke@435 | 77 | } |
duke@435 | 78 | if (!type_is_exact) { |
duke@435 | 79 | // If the type isn't exactly known then it can also be caught by |
duke@435 | 80 | // catch statements where the inexact type is a subtype of the |
duke@435 | 81 | // catch type. |
duke@435 | 82 | // given: foo extends bar extends Exception |
duke@435 | 83 | // throw bar can be caught by catch foo, catch bar, and catch |
duke@435 | 84 | // Exception, however it can't be caught by any handlers without |
duke@435 | 85 | // bar in its type hierarchy. |
duke@435 | 86 | if (handler_klass->is_subtype_of(klass)) { |
duke@435 | 87 | return true; |
duke@435 | 88 | } |
duke@435 | 89 | } |
duke@435 | 90 | } |
duke@435 | 91 | |
duke@435 | 92 | return false; |
duke@435 | 93 | } |
duke@435 | 94 | |
duke@435 | 95 | |
duke@435 | 96 | bool XHandlers::equals(XHandlers* others) const { |
duke@435 | 97 | if (others == NULL) return false; |
duke@435 | 98 | if (length() != others->length()) return false; |
duke@435 | 99 | |
duke@435 | 100 | for (int i = 0; i < length(); i++) { |
duke@435 | 101 | if (!handler_at(i)->equals(others->handler_at(i))) return false; |
duke@435 | 102 | } |
duke@435 | 103 | return true; |
duke@435 | 104 | } |
duke@435 | 105 | |
duke@435 | 106 | bool XHandler::equals(XHandler* other) const { |
duke@435 | 107 | assert(entry_pco() != -1 && other->entry_pco() != -1, "must have entry_pco"); |
duke@435 | 108 | |
duke@435 | 109 | if (entry_pco() != other->entry_pco()) return false; |
duke@435 | 110 | if (scope_count() != other->scope_count()) return false; |
duke@435 | 111 | if (_desc != other->_desc) return false; |
duke@435 | 112 | |
duke@435 | 113 | assert(entry_block() == other->entry_block(), "entry_block must be equal when entry_pco is equal"); |
duke@435 | 114 | return true; |
duke@435 | 115 | } |
duke@435 | 116 | |
duke@435 | 117 | |
duke@435 | 118 | // Implementation of IRScope |
duke@435 | 119 | |
duke@435 | 120 | BlockBegin* IRScope::header_block(BlockBegin* entry, BlockBegin::Flag f, ValueStack* state) { |
duke@435 | 121 | if (entry == NULL) return NULL; |
duke@435 | 122 | assert(entry->is_set(f), "entry/flag mismatch"); |
duke@435 | 123 | // create header block |
duke@435 | 124 | BlockBegin* h = new BlockBegin(entry->bci()); |
duke@435 | 125 | BlockEnd* g = new Goto(entry, false); |
duke@435 | 126 | h->set_next(g, entry->bci()); |
duke@435 | 127 | h->set_end(g); |
duke@435 | 128 | h->set(f); |
duke@435 | 129 | // setup header block end state |
duke@435 | 130 | ValueStack* s = state->copy(); // can use copy since stack is empty (=> no phis) |
duke@435 | 131 | assert(s->stack_is_empty(), "must have empty stack at entry point"); |
duke@435 | 132 | g->set_state(s); |
duke@435 | 133 | return h; |
duke@435 | 134 | } |
duke@435 | 135 | |
duke@435 | 136 | |
duke@435 | 137 | BlockBegin* IRScope::build_graph(Compilation* compilation, int osr_bci) { |
duke@435 | 138 | GraphBuilder gm(compilation, this); |
duke@435 | 139 | NOT_PRODUCT(if (PrintValueNumbering && Verbose) gm.print_stats()); |
duke@435 | 140 | if (compilation->bailed_out()) return NULL; |
duke@435 | 141 | return gm.start(); |
duke@435 | 142 | } |
duke@435 | 143 | |
duke@435 | 144 | |
duke@435 | 145 | IRScope::IRScope(Compilation* compilation, IRScope* caller, int caller_bci, ciMethod* method, int osr_bci, bool create_graph) |
duke@435 | 146 | : _callees(2) |
duke@435 | 147 | , _compilation(compilation) |
duke@435 | 148 | , _lock_stack_size(-1) |
duke@435 | 149 | , _requires_phi_function(method->max_locals()) |
duke@435 | 150 | { |
duke@435 | 151 | _caller = caller; |
duke@435 | 152 | _caller_bci = caller == NULL ? -1 : caller_bci; |
duke@435 | 153 | _caller_state = NULL; // Must be set later if needed |
duke@435 | 154 | _level = caller == NULL ? 0 : caller->level() + 1; |
duke@435 | 155 | _method = method; |
duke@435 | 156 | _xhandlers = new XHandlers(method); |
duke@435 | 157 | _number_of_locks = 0; |
duke@435 | 158 | _monitor_pairing_ok = method->has_balanced_monitors(); |
duke@435 | 159 | _start = NULL; |
duke@435 | 160 | |
duke@435 | 161 | if (osr_bci == -1) { |
duke@435 | 162 | _requires_phi_function.clear(); |
duke@435 | 163 | } else { |
duke@435 | 164 | // selective creation of phi functions is not possibel in osr-methods |
duke@435 | 165 | _requires_phi_function.set_range(0, method->max_locals()); |
duke@435 | 166 | } |
duke@435 | 167 | |
duke@435 | 168 | assert(method->holder()->is_loaded() , "method holder must be loaded"); |
duke@435 | 169 | |
duke@435 | 170 | // build graph if monitor pairing is ok |
duke@435 | 171 | if (create_graph && monitor_pairing_ok()) _start = build_graph(compilation, osr_bci); |
duke@435 | 172 | } |
duke@435 | 173 | |
duke@435 | 174 | |
duke@435 | 175 | int IRScope::max_stack() const { |
duke@435 | 176 | int my_max = method()->max_stack(); |
duke@435 | 177 | int callee_max = 0; |
duke@435 | 178 | for (int i = 0; i < number_of_callees(); i++) { |
duke@435 | 179 | callee_max = MAX2(callee_max, callee_no(i)->max_stack()); |
duke@435 | 180 | } |
duke@435 | 181 | return my_max + callee_max; |
duke@435 | 182 | } |
duke@435 | 183 | |
duke@435 | 184 | |
duke@435 | 185 | void IRScope::compute_lock_stack_size() { |
duke@435 | 186 | if (!InlineMethodsWithExceptionHandlers) { |
duke@435 | 187 | _lock_stack_size = 0; |
duke@435 | 188 | return; |
duke@435 | 189 | } |
duke@435 | 190 | |
duke@435 | 191 | // Figure out whether we have to preserve expression stack elements |
duke@435 | 192 | // for parent scopes, and if so, how many |
duke@435 | 193 | IRScope* cur_scope = this; |
duke@435 | 194 | while (cur_scope != NULL && !cur_scope->xhandlers()->has_handlers()) { |
duke@435 | 195 | cur_scope = cur_scope->caller(); |
duke@435 | 196 | } |
duke@435 | 197 | _lock_stack_size = (cur_scope == NULL ? 0 : |
duke@435 | 198 | (cur_scope->caller_state() == NULL ? 0 : |
duke@435 | 199 | cur_scope->caller_state()->stack_size())); |
duke@435 | 200 | } |
duke@435 | 201 | |
duke@435 | 202 | int IRScope::top_scope_bci() const { |
duke@435 | 203 | assert(!is_top_scope(), "no correct answer for top scope possible"); |
duke@435 | 204 | const IRScope* scope = this; |
duke@435 | 205 | while (!scope->caller()->is_top_scope()) { |
duke@435 | 206 | scope = scope->caller(); |
duke@435 | 207 | } |
duke@435 | 208 | return scope->caller_bci(); |
duke@435 | 209 | } |
duke@435 | 210 | |
duke@435 | 211 | |
duke@435 | 212 | |
duke@435 | 213 | // Implementation of CodeEmitInfo |
duke@435 | 214 | |
duke@435 | 215 | // Stack must be NON-null |
duke@435 | 216 | CodeEmitInfo::CodeEmitInfo(int bci, ValueStack* stack, XHandlers* exception_handlers) |
duke@435 | 217 | : _scope(stack->scope()) |
duke@435 | 218 | , _bci(bci) |
duke@435 | 219 | , _scope_debug_info(NULL) |
duke@435 | 220 | , _oop_map(NULL) |
duke@435 | 221 | , _stack(stack) |
duke@435 | 222 | , _exception_handlers(exception_handlers) |
duke@435 | 223 | , _next(NULL) |
duke@435 | 224 | , _id(-1) { |
duke@435 | 225 | assert(_stack != NULL, "must be non null"); |
duke@435 | 226 | assert(_bci == SynchronizationEntryBCI || Bytecodes::is_defined(scope()->method()->java_code_at_bci(_bci)), "make sure bci points at a real bytecode"); |
duke@435 | 227 | } |
duke@435 | 228 | |
duke@435 | 229 | |
duke@435 | 230 | CodeEmitInfo::CodeEmitInfo(CodeEmitInfo* info, bool lock_stack_only) |
duke@435 | 231 | : _scope(info->_scope) |
duke@435 | 232 | , _exception_handlers(NULL) |
duke@435 | 233 | , _bci(info->_bci) |
duke@435 | 234 | , _scope_debug_info(NULL) |
duke@435 | 235 | , _oop_map(NULL) { |
duke@435 | 236 | if (lock_stack_only) { |
duke@435 | 237 | if (info->_stack != NULL) { |
duke@435 | 238 | _stack = info->_stack->copy_locks(); |
duke@435 | 239 | } else { |
duke@435 | 240 | _stack = NULL; |
duke@435 | 241 | } |
duke@435 | 242 | } else { |
duke@435 | 243 | _stack = info->_stack; |
duke@435 | 244 | } |
duke@435 | 245 | |
duke@435 | 246 | // deep copy of exception handlers |
duke@435 | 247 | if (info->_exception_handlers != NULL) { |
duke@435 | 248 | _exception_handlers = new XHandlers(info->_exception_handlers); |
duke@435 | 249 | } |
duke@435 | 250 | } |
duke@435 | 251 | |
duke@435 | 252 | |
duke@435 | 253 | void CodeEmitInfo::record_debug_info(DebugInformationRecorder* recorder, int pc_offset) { |
duke@435 | 254 | // record the safepoint before recording the debug info for enclosing scopes |
duke@435 | 255 | recorder->add_safepoint(pc_offset, _oop_map->deep_copy()); |
duke@435 | 256 | _scope_debug_info->record_debug_info(recorder, pc_offset); |
duke@435 | 257 | recorder->end_safepoint(pc_offset); |
duke@435 | 258 | } |
duke@435 | 259 | |
duke@435 | 260 | |
duke@435 | 261 | void CodeEmitInfo::add_register_oop(LIR_Opr opr) { |
duke@435 | 262 | assert(_oop_map != NULL, "oop map must already exist"); |
duke@435 | 263 | assert(opr->is_single_cpu(), "should not call otherwise"); |
duke@435 | 264 | |
duke@435 | 265 | int frame_size = frame_map()->framesize(); |
duke@435 | 266 | int arg_count = frame_map()->oop_map_arg_count(); |
duke@435 | 267 | VMReg name = frame_map()->regname(opr); |
duke@435 | 268 | _oop_map->set_oop(name); |
duke@435 | 269 | } |
duke@435 | 270 | |
duke@435 | 271 | |
duke@435 | 272 | |
duke@435 | 273 | |
duke@435 | 274 | // Implementation of IR |
duke@435 | 275 | |
duke@435 | 276 | IR::IR(Compilation* compilation, ciMethod* method, int osr_bci) : |
duke@435 | 277 | _locals_size(in_WordSize(-1)) |
duke@435 | 278 | , _num_loops(0) { |
duke@435 | 279 | // initialize data structures |
duke@435 | 280 | ValueType::initialize(); |
duke@435 | 281 | Instruction::initialize(); |
duke@435 | 282 | BlockBegin::initialize(); |
duke@435 | 283 | GraphBuilder::initialize(); |
duke@435 | 284 | // setup IR fields |
duke@435 | 285 | _compilation = compilation; |
duke@435 | 286 | _top_scope = new IRScope(compilation, NULL, -1, method, osr_bci, true); |
duke@435 | 287 | _code = NULL; |
duke@435 | 288 | } |
duke@435 | 289 | |
duke@435 | 290 | |
duke@435 | 291 | void IR::optimize() { |
duke@435 | 292 | Optimizer opt(this); |
duke@435 | 293 | if (DoCEE) { |
duke@435 | 294 | opt.eliminate_conditional_expressions(); |
duke@435 | 295 | #ifndef PRODUCT |
duke@435 | 296 | if (PrintCFG || PrintCFG1) { tty->print_cr("CFG after CEE"); print(true); } |
duke@435 | 297 | if (PrintIR || PrintIR1 ) { tty->print_cr("IR after CEE"); print(false); } |
duke@435 | 298 | #endif |
duke@435 | 299 | } |
duke@435 | 300 | if (EliminateBlocks) { |
duke@435 | 301 | opt.eliminate_blocks(); |
duke@435 | 302 | #ifndef PRODUCT |
duke@435 | 303 | if (PrintCFG || PrintCFG1) { tty->print_cr("CFG after block elimination"); print(true); } |
duke@435 | 304 | if (PrintIR || PrintIR1 ) { tty->print_cr("IR after block elimination"); print(false); } |
duke@435 | 305 | #endif |
duke@435 | 306 | } |
duke@435 | 307 | if (EliminateNullChecks) { |
duke@435 | 308 | opt.eliminate_null_checks(); |
duke@435 | 309 | #ifndef PRODUCT |
duke@435 | 310 | if (PrintCFG || PrintCFG1) { tty->print_cr("CFG after null check elimination"); print(true); } |
duke@435 | 311 | if (PrintIR || PrintIR1 ) { tty->print_cr("IR after null check elimination"); print(false); } |
duke@435 | 312 | #endif |
duke@435 | 313 | } |
duke@435 | 314 | } |
duke@435 | 315 | |
duke@435 | 316 | |
duke@435 | 317 | static int sort_pairs(BlockPair** a, BlockPair** b) { |
duke@435 | 318 | if ((*a)->from() == (*b)->from()) { |
duke@435 | 319 | return (*a)->to()->block_id() - (*b)->to()->block_id(); |
duke@435 | 320 | } else { |
duke@435 | 321 | return (*a)->from()->block_id() - (*b)->from()->block_id(); |
duke@435 | 322 | } |
duke@435 | 323 | } |
duke@435 | 324 | |
duke@435 | 325 | |
duke@435 | 326 | class CriticalEdgeFinder: public BlockClosure { |
duke@435 | 327 | BlockPairList blocks; |
duke@435 | 328 | IR* _ir; |
duke@435 | 329 | |
duke@435 | 330 | public: |
duke@435 | 331 | CriticalEdgeFinder(IR* ir): _ir(ir) {} |
duke@435 | 332 | void block_do(BlockBegin* bb) { |
duke@435 | 333 | BlockEnd* be = bb->end(); |
duke@435 | 334 | int nos = be->number_of_sux(); |
duke@435 | 335 | if (nos >= 2) { |
duke@435 | 336 | for (int i = 0; i < nos; i++) { |
duke@435 | 337 | BlockBegin* sux = be->sux_at(i); |
duke@435 | 338 | if (sux->number_of_preds() >= 2) { |
duke@435 | 339 | blocks.append(new BlockPair(bb, sux)); |
duke@435 | 340 | } |
duke@435 | 341 | } |
duke@435 | 342 | } |
duke@435 | 343 | } |
duke@435 | 344 | |
duke@435 | 345 | void split_edges() { |
duke@435 | 346 | BlockPair* last_pair = NULL; |
duke@435 | 347 | blocks.sort(sort_pairs); |
duke@435 | 348 | for (int i = 0; i < blocks.length(); i++) { |
duke@435 | 349 | BlockPair* pair = blocks.at(i); |
duke@435 | 350 | if (last_pair != NULL && pair->is_same(last_pair)) continue; |
duke@435 | 351 | BlockBegin* from = pair->from(); |
duke@435 | 352 | BlockBegin* to = pair->to(); |
duke@435 | 353 | BlockBegin* split = from->insert_block_between(to); |
duke@435 | 354 | #ifndef PRODUCT |
duke@435 | 355 | if ((PrintIR || PrintIR1) && Verbose) { |
duke@435 | 356 | tty->print_cr("Split critical edge B%d -> B%d (new block B%d)", |
duke@435 | 357 | from->block_id(), to->block_id(), split->block_id()); |
duke@435 | 358 | } |
duke@435 | 359 | #endif |
duke@435 | 360 | last_pair = pair; |
duke@435 | 361 | } |
duke@435 | 362 | } |
duke@435 | 363 | }; |
duke@435 | 364 | |
duke@435 | 365 | void IR::split_critical_edges() { |
duke@435 | 366 | CriticalEdgeFinder cef(this); |
duke@435 | 367 | |
duke@435 | 368 | iterate_preorder(&cef); |
duke@435 | 369 | cef.split_edges(); |
duke@435 | 370 | } |
duke@435 | 371 | |
duke@435 | 372 | |
duke@435 | 373 | class UseCountComputer: public AllStatic { |
duke@435 | 374 | private: |
duke@435 | 375 | static void update_use_count(Value* n) { |
duke@435 | 376 | // Local instructions and Phis for expression stack values at the |
duke@435 | 377 | // start of basic blocks are not added to the instruction list |
duke@435 | 378 | if ((*n)->bci() == -99 && (*n)->as_Local() == NULL && |
duke@435 | 379 | (*n)->as_Phi() == NULL) { |
duke@435 | 380 | assert(false, "a node was not appended to the graph"); |
duke@435 | 381 | Compilation::current_compilation()->bailout("a node was not appended to the graph"); |
duke@435 | 382 | } |
duke@435 | 383 | // use n's input if not visited before |
duke@435 | 384 | if (!(*n)->is_pinned() && !(*n)->has_uses()) { |
duke@435 | 385 | // note: a) if the instruction is pinned, it will be handled by compute_use_count |
duke@435 | 386 | // b) if the instruction has uses, it was touched before |
duke@435 | 387 | // => in both cases we don't need to update n's values |
duke@435 | 388 | uses_do(n); |
duke@435 | 389 | } |
duke@435 | 390 | // use n |
duke@435 | 391 | (*n)->_use_count++; |
duke@435 | 392 | } |
duke@435 | 393 | |
duke@435 | 394 | static Values* worklist; |
duke@435 | 395 | static int depth; |
duke@435 | 396 | enum { |
duke@435 | 397 | max_recurse_depth = 20 |
duke@435 | 398 | }; |
duke@435 | 399 | |
duke@435 | 400 | static void uses_do(Value* n) { |
duke@435 | 401 | depth++; |
duke@435 | 402 | if (depth > max_recurse_depth) { |
duke@435 | 403 | // don't allow the traversal to recurse too deeply |
duke@435 | 404 | worklist->push(*n); |
duke@435 | 405 | } else { |
duke@435 | 406 | (*n)->input_values_do(update_use_count); |
duke@435 | 407 | // special handling for some instructions |
duke@435 | 408 | if ((*n)->as_BlockEnd() != NULL) { |
duke@435 | 409 | // note on BlockEnd: |
duke@435 | 410 | // must 'use' the stack only if the method doesn't |
duke@435 | 411 | // terminate, however, in those cases stack is empty |
duke@435 | 412 | (*n)->state_values_do(update_use_count); |
duke@435 | 413 | } |
duke@435 | 414 | } |
duke@435 | 415 | depth--; |
duke@435 | 416 | } |
duke@435 | 417 | |
duke@435 | 418 | static void basic_compute_use_count(BlockBegin* b) { |
duke@435 | 419 | depth = 0; |
duke@435 | 420 | // process all pinned nodes as the roots of expression trees |
duke@435 | 421 | for (Instruction* n = b; n != NULL; n = n->next()) { |
duke@435 | 422 | if (n->is_pinned()) uses_do(&n); |
duke@435 | 423 | } |
duke@435 | 424 | assert(depth == 0, "should have counted back down"); |
duke@435 | 425 | |
duke@435 | 426 | // now process any unpinned nodes which recursed too deeply |
duke@435 | 427 | while (worklist->length() > 0) { |
duke@435 | 428 | Value t = worklist->pop(); |
duke@435 | 429 | if (!t->is_pinned()) { |
duke@435 | 430 | // compute the use count |
duke@435 | 431 | uses_do(&t); |
duke@435 | 432 | |
duke@435 | 433 | // pin the instruction so that LIRGenerator doesn't recurse |
duke@435 | 434 | // too deeply during it's evaluation. |
duke@435 | 435 | t->pin(); |
duke@435 | 436 | } |
duke@435 | 437 | } |
duke@435 | 438 | assert(depth == 0, "should have counted back down"); |
duke@435 | 439 | } |
duke@435 | 440 | |
duke@435 | 441 | public: |
duke@435 | 442 | static void compute(BlockList* blocks) { |
duke@435 | 443 | worklist = new Values(); |
duke@435 | 444 | blocks->blocks_do(basic_compute_use_count); |
duke@435 | 445 | worklist = NULL; |
duke@435 | 446 | } |
duke@435 | 447 | }; |
duke@435 | 448 | |
duke@435 | 449 | |
duke@435 | 450 | Values* UseCountComputer::worklist = NULL; |
duke@435 | 451 | int UseCountComputer::depth = 0; |
duke@435 | 452 | |
duke@435 | 453 | // helper macro for short definition of trace-output inside code |
duke@435 | 454 | #ifndef PRODUCT |
duke@435 | 455 | #define TRACE_LINEAR_SCAN(level, code) \ |
duke@435 | 456 | if (TraceLinearScanLevel >= level) { \ |
duke@435 | 457 | code; \ |
duke@435 | 458 | } |
duke@435 | 459 | #else |
duke@435 | 460 | #define TRACE_LINEAR_SCAN(level, code) |
duke@435 | 461 | #endif |
duke@435 | 462 | |
duke@435 | 463 | class ComputeLinearScanOrder : public StackObj { |
duke@435 | 464 | private: |
duke@435 | 465 | int _max_block_id; // the highest block_id of a block |
duke@435 | 466 | int _num_blocks; // total number of blocks (smaller than _max_block_id) |
duke@435 | 467 | int _num_loops; // total number of loops |
duke@435 | 468 | bool _iterative_dominators;// method requires iterative computation of dominatiors |
duke@435 | 469 | |
duke@435 | 470 | BlockList* _linear_scan_order; // the resulting list of blocks in correct order |
duke@435 | 471 | |
duke@435 | 472 | BitMap _visited_blocks; // used for recursive processing of blocks |
duke@435 | 473 | BitMap _active_blocks; // used for recursive processing of blocks |
duke@435 | 474 | BitMap _dominator_blocks; // temproary BitMap used for computation of dominator |
duke@435 | 475 | intArray _forward_branches; // number of incoming forward branches for each block |
duke@435 | 476 | BlockList _loop_end_blocks; // list of all loop end blocks collected during count_edges |
duke@435 | 477 | BitMap2D _loop_map; // two-dimensional bit set: a bit is set if a block is contained in a loop |
duke@435 | 478 | BlockList _work_list; // temporary list (used in mark_loops and compute_order) |
duke@435 | 479 | |
duke@435 | 480 | // accessors for _visited_blocks and _active_blocks |
duke@435 | 481 | void init_visited() { _active_blocks.clear(); _visited_blocks.clear(); } |
duke@435 | 482 | bool is_visited(BlockBegin* b) const { return _visited_blocks.at(b->block_id()); } |
duke@435 | 483 | bool is_active(BlockBegin* b) const { return _active_blocks.at(b->block_id()); } |
duke@435 | 484 | void set_visited(BlockBegin* b) { assert(!is_visited(b), "already set"); _visited_blocks.set_bit(b->block_id()); } |
duke@435 | 485 | void set_active(BlockBegin* b) { assert(!is_active(b), "already set"); _active_blocks.set_bit(b->block_id()); } |
duke@435 | 486 | void clear_active(BlockBegin* b) { assert(is_active(b), "not already"); _active_blocks.clear_bit(b->block_id()); } |
duke@435 | 487 | |
duke@435 | 488 | // accessors for _forward_branches |
duke@435 | 489 | void inc_forward_branches(BlockBegin* b) { _forward_branches.at_put(b->block_id(), _forward_branches.at(b->block_id()) + 1); } |
duke@435 | 490 | int dec_forward_branches(BlockBegin* b) { _forward_branches.at_put(b->block_id(), _forward_branches.at(b->block_id()) - 1); return _forward_branches.at(b->block_id()); } |
duke@435 | 491 | |
duke@435 | 492 | // accessors for _loop_map |
duke@435 | 493 | bool is_block_in_loop (int loop_idx, BlockBegin* b) const { return _loop_map.at(loop_idx, b->block_id()); } |
duke@435 | 494 | void set_block_in_loop (int loop_idx, BlockBegin* b) { _loop_map.set_bit(loop_idx, b->block_id()); } |
duke@435 | 495 | void clear_block_in_loop(int loop_idx, int block_id) { _loop_map.clear_bit(loop_idx, block_id); } |
duke@435 | 496 | |
duke@435 | 497 | // count edges between blocks |
duke@435 | 498 | void count_edges(BlockBegin* cur, BlockBegin* parent); |
duke@435 | 499 | |
duke@435 | 500 | // loop detection |
duke@435 | 501 | void mark_loops(); |
duke@435 | 502 | void clear_non_natural_loops(BlockBegin* start_block); |
duke@435 | 503 | void assign_loop_depth(BlockBegin* start_block); |
duke@435 | 504 | |
duke@435 | 505 | // computation of final block order |
duke@435 | 506 | BlockBegin* common_dominator(BlockBegin* a, BlockBegin* b); |
duke@435 | 507 | void compute_dominator(BlockBegin* cur, BlockBegin* parent); |
duke@435 | 508 | int compute_weight(BlockBegin* cur); |
duke@435 | 509 | bool ready_for_processing(BlockBegin* cur); |
duke@435 | 510 | void sort_into_work_list(BlockBegin* b); |
duke@435 | 511 | void append_block(BlockBegin* cur); |
duke@435 | 512 | void compute_order(BlockBegin* start_block); |
duke@435 | 513 | |
duke@435 | 514 | // fixup of dominators for non-natural loops |
duke@435 | 515 | bool compute_dominators_iter(); |
duke@435 | 516 | void compute_dominators(); |
duke@435 | 517 | |
duke@435 | 518 | // debug functions |
duke@435 | 519 | NOT_PRODUCT(void print_blocks();) |
duke@435 | 520 | DEBUG_ONLY(void verify();) |
duke@435 | 521 | |
duke@435 | 522 | public: |
duke@435 | 523 | ComputeLinearScanOrder(BlockBegin* start_block); |
duke@435 | 524 | |
duke@435 | 525 | // accessors for final result |
duke@435 | 526 | BlockList* linear_scan_order() const { return _linear_scan_order; } |
duke@435 | 527 | int num_loops() const { return _num_loops; } |
duke@435 | 528 | }; |
duke@435 | 529 | |
duke@435 | 530 | |
duke@435 | 531 | ComputeLinearScanOrder::ComputeLinearScanOrder(BlockBegin* start_block) : |
duke@435 | 532 | _max_block_id(BlockBegin::number_of_blocks()), |
duke@435 | 533 | _num_blocks(0), |
duke@435 | 534 | _num_loops(0), |
duke@435 | 535 | _iterative_dominators(false), |
duke@435 | 536 | _visited_blocks(_max_block_id), |
duke@435 | 537 | _active_blocks(_max_block_id), |
duke@435 | 538 | _dominator_blocks(_max_block_id), |
duke@435 | 539 | _forward_branches(_max_block_id, 0), |
duke@435 | 540 | _loop_end_blocks(8), |
duke@435 | 541 | _work_list(8), |
duke@435 | 542 | _linear_scan_order(NULL), // initialized later with correct size |
duke@435 | 543 | _loop_map(0, 0) // initialized later with correct size |
duke@435 | 544 | { |
duke@435 | 545 | TRACE_LINEAR_SCAN(2, "***** computing linear-scan block order"); |
duke@435 | 546 | |
duke@435 | 547 | init_visited(); |
duke@435 | 548 | count_edges(start_block, NULL); |
duke@435 | 549 | |
duke@435 | 550 | if (_num_loops > 0) { |
duke@435 | 551 | mark_loops(); |
duke@435 | 552 | clear_non_natural_loops(start_block); |
duke@435 | 553 | assign_loop_depth(start_block); |
duke@435 | 554 | } |
duke@435 | 555 | |
duke@435 | 556 | compute_order(start_block); |
duke@435 | 557 | compute_dominators(); |
duke@435 | 558 | |
duke@435 | 559 | NOT_PRODUCT(print_blocks()); |
duke@435 | 560 | DEBUG_ONLY(verify()); |
duke@435 | 561 | } |
duke@435 | 562 | |
duke@435 | 563 | |
duke@435 | 564 | // Traverse the CFG: |
duke@435 | 565 | // * count total number of blocks |
duke@435 | 566 | // * count all incoming edges and backward incoming edges |
duke@435 | 567 | // * number loop header blocks |
duke@435 | 568 | // * create a list with all loop end blocks |
duke@435 | 569 | void ComputeLinearScanOrder::count_edges(BlockBegin* cur, BlockBegin* parent) { |
duke@435 | 570 | TRACE_LINEAR_SCAN(3, tty->print_cr("Enter count_edges for block B%d coming from B%d", cur->block_id(), parent != NULL ? parent->block_id() : -1)); |
duke@435 | 571 | assert(cur->dominator() == NULL, "dominator already initialized"); |
duke@435 | 572 | |
duke@435 | 573 | if (is_active(cur)) { |
duke@435 | 574 | TRACE_LINEAR_SCAN(3, tty->print_cr("backward branch")); |
duke@435 | 575 | assert(is_visited(cur), "block must be visisted when block is active"); |
duke@435 | 576 | assert(parent != NULL, "must have parent"); |
duke@435 | 577 | assert(parent->number_of_sux() == 1, "loop end blocks must have one successor (critical edges are split)"); |
duke@435 | 578 | |
duke@435 | 579 | cur->set(BlockBegin::linear_scan_loop_header_flag); |
duke@435 | 580 | cur->set(BlockBegin::backward_branch_target_flag); |
duke@435 | 581 | |
duke@435 | 582 | parent->set(BlockBegin::linear_scan_loop_end_flag); |
duke@435 | 583 | _loop_end_blocks.append(parent); |
duke@435 | 584 | return; |
duke@435 | 585 | } |
duke@435 | 586 | |
duke@435 | 587 | // increment number of incoming forward branches |
duke@435 | 588 | inc_forward_branches(cur); |
duke@435 | 589 | |
duke@435 | 590 | if (is_visited(cur)) { |
duke@435 | 591 | TRACE_LINEAR_SCAN(3, tty->print_cr("block already visited")); |
duke@435 | 592 | return; |
duke@435 | 593 | } |
duke@435 | 594 | |
duke@435 | 595 | _num_blocks++; |
duke@435 | 596 | set_visited(cur); |
duke@435 | 597 | set_active(cur); |
duke@435 | 598 | |
duke@435 | 599 | // recursive call for all successors |
duke@435 | 600 | int i; |
duke@435 | 601 | for (i = cur->number_of_sux() - 1; i >= 0; i--) { |
duke@435 | 602 | count_edges(cur->sux_at(i), cur); |
duke@435 | 603 | } |
duke@435 | 604 | for (i = cur->number_of_exception_handlers() - 1; i >= 0; i--) { |
duke@435 | 605 | count_edges(cur->exception_handler_at(i), cur); |
duke@435 | 606 | } |
duke@435 | 607 | |
duke@435 | 608 | clear_active(cur); |
duke@435 | 609 | |
duke@435 | 610 | // Each loop has a unique number. |
duke@435 | 611 | // When multiple loops are nested, assign_loop_depth assumes that the |
duke@435 | 612 | // innermost loop has the lowest number. This is guaranteed by setting |
duke@435 | 613 | // the loop number after the recursive calls for the successors above |
duke@435 | 614 | // have returned. |
duke@435 | 615 | if (cur->is_set(BlockBegin::linear_scan_loop_header_flag)) { |
duke@435 | 616 | assert(cur->loop_index() == -1, "cannot set loop-index twice"); |
duke@435 | 617 | TRACE_LINEAR_SCAN(3, tty->print_cr("Block B%d is loop header of loop %d", cur->block_id(), _num_loops)); |
duke@435 | 618 | |
duke@435 | 619 | cur->set_loop_index(_num_loops); |
duke@435 | 620 | _num_loops++; |
duke@435 | 621 | } |
duke@435 | 622 | |
duke@435 | 623 | TRACE_LINEAR_SCAN(3, tty->print_cr("Finished count_edges for block B%d", cur->block_id())); |
duke@435 | 624 | } |
duke@435 | 625 | |
duke@435 | 626 | |
duke@435 | 627 | void ComputeLinearScanOrder::mark_loops() { |
duke@435 | 628 | TRACE_LINEAR_SCAN(3, tty->print_cr("----- marking loops")); |
duke@435 | 629 | |
duke@435 | 630 | _loop_map = BitMap2D(_num_loops, _max_block_id); |
duke@435 | 631 | _loop_map.clear(); |
duke@435 | 632 | |
duke@435 | 633 | for (int i = _loop_end_blocks.length() - 1; i >= 0; i--) { |
duke@435 | 634 | BlockBegin* loop_end = _loop_end_blocks.at(i); |
duke@435 | 635 | BlockBegin* loop_start = loop_end->sux_at(0); |
duke@435 | 636 | int loop_idx = loop_start->loop_index(); |
duke@435 | 637 | |
duke@435 | 638 | TRACE_LINEAR_SCAN(3, tty->print_cr("Processing loop from B%d to B%d (loop %d):", loop_start->block_id(), loop_end->block_id(), loop_idx)); |
duke@435 | 639 | assert(loop_end->is_set(BlockBegin::linear_scan_loop_end_flag), "loop end flag must be set"); |
duke@435 | 640 | assert(loop_end->number_of_sux() == 1, "incorrect number of successors"); |
duke@435 | 641 | assert(loop_start->is_set(BlockBegin::linear_scan_loop_header_flag), "loop header flag must be set"); |
duke@435 | 642 | assert(loop_idx >= 0 && loop_idx < _num_loops, "loop index not set"); |
duke@435 | 643 | assert(_work_list.is_empty(), "work list must be empty before processing"); |
duke@435 | 644 | |
duke@435 | 645 | // add the end-block of the loop to the working list |
duke@435 | 646 | _work_list.push(loop_end); |
duke@435 | 647 | set_block_in_loop(loop_idx, loop_end); |
duke@435 | 648 | do { |
duke@435 | 649 | BlockBegin* cur = _work_list.pop(); |
duke@435 | 650 | |
duke@435 | 651 | TRACE_LINEAR_SCAN(3, tty->print_cr(" processing B%d", cur->block_id())); |
duke@435 | 652 | assert(is_block_in_loop(loop_idx, cur), "bit in loop map must be set when block is in work list"); |
duke@435 | 653 | |
duke@435 | 654 | // recursive processing of all predecessors ends when start block of loop is reached |
duke@435 | 655 | if (cur != loop_start && !cur->is_set(BlockBegin::osr_entry_flag)) { |
duke@435 | 656 | for (int j = cur->number_of_preds() - 1; j >= 0; j--) { |
duke@435 | 657 | BlockBegin* pred = cur->pred_at(j); |
duke@435 | 658 | |
duke@435 | 659 | if (!is_block_in_loop(loop_idx, pred) /*&& !pred->is_set(BlockBeginosr_entry_flag)*/) { |
duke@435 | 660 | // this predecessor has not been processed yet, so add it to work list |
duke@435 | 661 | TRACE_LINEAR_SCAN(3, tty->print_cr(" pushing B%d", pred->block_id())); |
duke@435 | 662 | _work_list.push(pred); |
duke@435 | 663 | set_block_in_loop(loop_idx, pred); |
duke@435 | 664 | } |
duke@435 | 665 | } |
duke@435 | 666 | } |
duke@435 | 667 | } while (!_work_list.is_empty()); |
duke@435 | 668 | } |
duke@435 | 669 | } |
duke@435 | 670 | |
duke@435 | 671 | |
duke@435 | 672 | // check for non-natural loops (loops where the loop header does not dominate |
duke@435 | 673 | // all other loop blocks = loops with mulitple entries). |
duke@435 | 674 | // such loops are ignored |
duke@435 | 675 | void ComputeLinearScanOrder::clear_non_natural_loops(BlockBegin* start_block) { |
duke@435 | 676 | for (int i = _num_loops - 1; i >= 0; i--) { |
duke@435 | 677 | if (is_block_in_loop(i, start_block)) { |
duke@435 | 678 | // loop i contains the entry block of the method |
duke@435 | 679 | // -> this is not a natural loop, so ignore it |
duke@435 | 680 | TRACE_LINEAR_SCAN(2, tty->print_cr("Loop %d is non-natural, so it is ignored", i)); |
duke@435 | 681 | |
duke@435 | 682 | for (int block_id = _max_block_id - 1; block_id >= 0; block_id--) { |
duke@435 | 683 | clear_block_in_loop(i, block_id); |
duke@435 | 684 | } |
duke@435 | 685 | _iterative_dominators = true; |
duke@435 | 686 | } |
duke@435 | 687 | } |
duke@435 | 688 | } |
duke@435 | 689 | |
duke@435 | 690 | void ComputeLinearScanOrder::assign_loop_depth(BlockBegin* start_block) { |
duke@435 | 691 | TRACE_LINEAR_SCAN(3, "----- computing loop-depth and weight"); |
duke@435 | 692 | init_visited(); |
duke@435 | 693 | |
duke@435 | 694 | assert(_work_list.is_empty(), "work list must be empty before processing"); |
duke@435 | 695 | _work_list.append(start_block); |
duke@435 | 696 | |
duke@435 | 697 | do { |
duke@435 | 698 | BlockBegin* cur = _work_list.pop(); |
duke@435 | 699 | |
duke@435 | 700 | if (!is_visited(cur)) { |
duke@435 | 701 | set_visited(cur); |
duke@435 | 702 | TRACE_LINEAR_SCAN(4, tty->print_cr("Computing loop depth for block B%d", cur->block_id())); |
duke@435 | 703 | |
duke@435 | 704 | // compute loop-depth and loop-index for the block |
duke@435 | 705 | assert(cur->loop_depth() == 0, "cannot set loop-depth twice"); |
duke@435 | 706 | int i; |
duke@435 | 707 | int loop_depth = 0; |
duke@435 | 708 | int min_loop_idx = -1; |
duke@435 | 709 | for (i = _num_loops - 1; i >= 0; i--) { |
duke@435 | 710 | if (is_block_in_loop(i, cur)) { |
duke@435 | 711 | loop_depth++; |
duke@435 | 712 | min_loop_idx = i; |
duke@435 | 713 | } |
duke@435 | 714 | } |
duke@435 | 715 | cur->set_loop_depth(loop_depth); |
duke@435 | 716 | cur->set_loop_index(min_loop_idx); |
duke@435 | 717 | |
duke@435 | 718 | // append all unvisited successors to work list |
duke@435 | 719 | for (i = cur->number_of_sux() - 1; i >= 0; i--) { |
duke@435 | 720 | _work_list.append(cur->sux_at(i)); |
duke@435 | 721 | } |
duke@435 | 722 | for (i = cur->number_of_exception_handlers() - 1; i >= 0; i--) { |
duke@435 | 723 | _work_list.append(cur->exception_handler_at(i)); |
duke@435 | 724 | } |
duke@435 | 725 | } |
duke@435 | 726 | } while (!_work_list.is_empty()); |
duke@435 | 727 | } |
duke@435 | 728 | |
duke@435 | 729 | |
duke@435 | 730 | BlockBegin* ComputeLinearScanOrder::common_dominator(BlockBegin* a, BlockBegin* b) { |
duke@435 | 731 | assert(a != NULL && b != NULL, "must have input blocks"); |
duke@435 | 732 | |
duke@435 | 733 | _dominator_blocks.clear(); |
duke@435 | 734 | while (a != NULL) { |
duke@435 | 735 | _dominator_blocks.set_bit(a->block_id()); |
duke@435 | 736 | assert(a->dominator() != NULL || a == _linear_scan_order->at(0), "dominator must be initialized"); |
duke@435 | 737 | a = a->dominator(); |
duke@435 | 738 | } |
duke@435 | 739 | while (b != NULL && !_dominator_blocks.at(b->block_id())) { |
duke@435 | 740 | assert(b->dominator() != NULL || b == _linear_scan_order->at(0), "dominator must be initialized"); |
duke@435 | 741 | b = b->dominator(); |
duke@435 | 742 | } |
duke@435 | 743 | |
duke@435 | 744 | assert(b != NULL, "could not find dominator"); |
duke@435 | 745 | return b; |
duke@435 | 746 | } |
duke@435 | 747 | |
duke@435 | 748 | void ComputeLinearScanOrder::compute_dominator(BlockBegin* cur, BlockBegin* parent) { |
duke@435 | 749 | if (cur->dominator() == NULL) { |
duke@435 | 750 | TRACE_LINEAR_SCAN(4, tty->print_cr("DOM: initializing dominator of B%d to B%d", cur->block_id(), parent->block_id())); |
duke@435 | 751 | cur->set_dominator(parent); |
duke@435 | 752 | |
duke@435 | 753 | } else if (!(cur->is_set(BlockBegin::linear_scan_loop_header_flag) && parent->is_set(BlockBegin::linear_scan_loop_end_flag))) { |
duke@435 | 754 | TRACE_LINEAR_SCAN(4, tty->print_cr("DOM: computing dominator of B%d: common dominator of B%d and B%d is B%d", cur->block_id(), parent->block_id(), cur->dominator()->block_id(), common_dominator(cur->dominator(), parent)->block_id())); |
duke@435 | 755 | assert(cur->number_of_preds() > 1, ""); |
duke@435 | 756 | cur->set_dominator(common_dominator(cur->dominator(), parent)); |
duke@435 | 757 | } |
duke@435 | 758 | } |
duke@435 | 759 | |
duke@435 | 760 | |
duke@435 | 761 | int ComputeLinearScanOrder::compute_weight(BlockBegin* cur) { |
duke@435 | 762 | BlockBegin* single_sux = NULL; |
duke@435 | 763 | if (cur->number_of_sux() == 1) { |
duke@435 | 764 | single_sux = cur->sux_at(0); |
duke@435 | 765 | } |
duke@435 | 766 | |
duke@435 | 767 | // limit loop-depth to 15 bit (only for security reason, it will never be so big) |
duke@435 | 768 | int weight = (cur->loop_depth() & 0x7FFF) << 16; |
duke@435 | 769 | |
duke@435 | 770 | // general macro for short definition of weight flags |
duke@435 | 771 | // the first instance of INC_WEIGHT_IF has the highest priority |
duke@435 | 772 | int cur_bit = 15; |
duke@435 | 773 | #define INC_WEIGHT_IF(condition) if ((condition)) { weight |= (1 << cur_bit); } cur_bit--; |
duke@435 | 774 | |
duke@435 | 775 | // this is necessery for the (very rare) case that two successing blocks have |
duke@435 | 776 | // the same loop depth, but a different loop index (can happen for endless loops |
duke@435 | 777 | // with exception handlers) |
duke@435 | 778 | INC_WEIGHT_IF(!cur->is_set(BlockBegin::linear_scan_loop_header_flag)); |
duke@435 | 779 | |
duke@435 | 780 | // loop end blocks (blocks that end with a backward branch) are added |
duke@435 | 781 | // after all other blocks of the loop. |
duke@435 | 782 | INC_WEIGHT_IF(!cur->is_set(BlockBegin::linear_scan_loop_end_flag)); |
duke@435 | 783 | |
duke@435 | 784 | // critical edge split blocks are prefered because than they have a bigger |
duke@435 | 785 | // proability to be completely empty |
duke@435 | 786 | INC_WEIGHT_IF(cur->is_set(BlockBegin::critical_edge_split_flag)); |
duke@435 | 787 | |
duke@435 | 788 | // exceptions should not be thrown in normal control flow, so these blocks |
duke@435 | 789 | // are added as late as possible |
duke@435 | 790 | INC_WEIGHT_IF(cur->end()->as_Throw() == NULL && (single_sux == NULL || single_sux->end()->as_Throw() == NULL)); |
duke@435 | 791 | INC_WEIGHT_IF(cur->end()->as_Return() == NULL && (single_sux == NULL || single_sux->end()->as_Return() == NULL)); |
duke@435 | 792 | |
duke@435 | 793 | // exceptions handlers are added as late as possible |
duke@435 | 794 | INC_WEIGHT_IF(!cur->is_set(BlockBegin::exception_entry_flag)); |
duke@435 | 795 | |
duke@435 | 796 | // guarantee that weight is > 0 |
duke@435 | 797 | weight |= 1; |
duke@435 | 798 | |
duke@435 | 799 | #undef INC_WEIGHT_IF |
duke@435 | 800 | assert(cur_bit >= 0, "too many flags"); |
duke@435 | 801 | assert(weight > 0, "weight cannot become negative"); |
duke@435 | 802 | |
duke@435 | 803 | return weight; |
duke@435 | 804 | } |
duke@435 | 805 | |
duke@435 | 806 | bool ComputeLinearScanOrder::ready_for_processing(BlockBegin* cur) { |
duke@435 | 807 | // Discount the edge just traveled. |
duke@435 | 808 | // When the number drops to zero, all forward branches were processed |
duke@435 | 809 | if (dec_forward_branches(cur) != 0) { |
duke@435 | 810 | return false; |
duke@435 | 811 | } |
duke@435 | 812 | |
duke@435 | 813 | assert(_linear_scan_order->index_of(cur) == -1, "block already processed (block can be ready only once)"); |
duke@435 | 814 | assert(_work_list.index_of(cur) == -1, "block already in work-list (block can be ready only once)"); |
duke@435 | 815 | return true; |
duke@435 | 816 | } |
duke@435 | 817 | |
duke@435 | 818 | void ComputeLinearScanOrder::sort_into_work_list(BlockBegin* cur) { |
duke@435 | 819 | assert(_work_list.index_of(cur) == -1, "block already in work list"); |
duke@435 | 820 | |
duke@435 | 821 | int cur_weight = compute_weight(cur); |
duke@435 | 822 | |
duke@435 | 823 | // the linear_scan_number is used to cache the weight of a block |
duke@435 | 824 | cur->set_linear_scan_number(cur_weight); |
duke@435 | 825 | |
duke@435 | 826 | #ifndef PRODUCT |
duke@435 | 827 | if (StressLinearScan) { |
duke@435 | 828 | _work_list.insert_before(0, cur); |
duke@435 | 829 | return; |
duke@435 | 830 | } |
duke@435 | 831 | #endif |
duke@435 | 832 | |
duke@435 | 833 | _work_list.append(NULL); // provide space for new element |
duke@435 | 834 | |
duke@435 | 835 | int insert_idx = _work_list.length() - 1; |
duke@435 | 836 | while (insert_idx > 0 && _work_list.at(insert_idx - 1)->linear_scan_number() > cur_weight) { |
duke@435 | 837 | _work_list.at_put(insert_idx, _work_list.at(insert_idx - 1)); |
duke@435 | 838 | insert_idx--; |
duke@435 | 839 | } |
duke@435 | 840 | _work_list.at_put(insert_idx, cur); |
duke@435 | 841 | |
duke@435 | 842 | TRACE_LINEAR_SCAN(3, tty->print_cr("Sorted B%d into worklist. new worklist:", cur->block_id())); |
duke@435 | 843 | TRACE_LINEAR_SCAN(3, for (int i = 0; i < _work_list.length(); i++) tty->print_cr("%8d B%2d weight:%6x", i, _work_list.at(i)->block_id(), _work_list.at(i)->linear_scan_number())); |
duke@435 | 844 | |
duke@435 | 845 | #ifdef ASSERT |
duke@435 | 846 | for (int i = 0; i < _work_list.length(); i++) { |
duke@435 | 847 | assert(_work_list.at(i)->linear_scan_number() > 0, "weight not set"); |
duke@435 | 848 | assert(i == 0 || _work_list.at(i - 1)->linear_scan_number() <= _work_list.at(i)->linear_scan_number(), "incorrect order in worklist"); |
duke@435 | 849 | } |
duke@435 | 850 | #endif |
duke@435 | 851 | } |
duke@435 | 852 | |
duke@435 | 853 | void ComputeLinearScanOrder::append_block(BlockBegin* cur) { |
duke@435 | 854 | TRACE_LINEAR_SCAN(3, tty->print_cr("appending block B%d (weight 0x%6x) to linear-scan order", cur->block_id(), cur->linear_scan_number())); |
duke@435 | 855 | assert(_linear_scan_order->index_of(cur) == -1, "cannot add the same block twice"); |
duke@435 | 856 | |
duke@435 | 857 | // currently, the linear scan order and code emit order are equal. |
duke@435 | 858 | // therefore the linear_scan_number and the weight of a block must also |
duke@435 | 859 | // be equal. |
duke@435 | 860 | cur->set_linear_scan_number(_linear_scan_order->length()); |
duke@435 | 861 | _linear_scan_order->append(cur); |
duke@435 | 862 | } |
duke@435 | 863 | |
duke@435 | 864 | void ComputeLinearScanOrder::compute_order(BlockBegin* start_block) { |
duke@435 | 865 | TRACE_LINEAR_SCAN(3, "----- computing final block order"); |
duke@435 | 866 | |
duke@435 | 867 | // the start block is always the first block in the linear scan order |
duke@435 | 868 | _linear_scan_order = new BlockList(_num_blocks); |
duke@435 | 869 | append_block(start_block); |
duke@435 | 870 | |
duke@435 | 871 | assert(start_block->end()->as_Base() != NULL, "start block must end with Base-instruction"); |
duke@435 | 872 | BlockBegin* std_entry = ((Base*)start_block->end())->std_entry(); |
duke@435 | 873 | BlockBegin* osr_entry = ((Base*)start_block->end())->osr_entry(); |
duke@435 | 874 | |
duke@435 | 875 | BlockBegin* sux_of_osr_entry = NULL; |
duke@435 | 876 | if (osr_entry != NULL) { |
duke@435 | 877 | // special handling for osr entry: |
duke@435 | 878 | // ignore the edge between the osr entry and its successor for processing |
duke@435 | 879 | // the osr entry block is added manually below |
duke@435 | 880 | assert(osr_entry->number_of_sux() == 1, "osr entry must have exactly one successor"); |
duke@435 | 881 | assert(osr_entry->sux_at(0)->number_of_preds() >= 2, "sucessor of osr entry must have two predecessors (otherwise it is not present in normal control flow"); |
duke@435 | 882 | |
duke@435 | 883 | sux_of_osr_entry = osr_entry->sux_at(0); |
duke@435 | 884 | dec_forward_branches(sux_of_osr_entry); |
duke@435 | 885 | |
duke@435 | 886 | compute_dominator(osr_entry, start_block); |
duke@435 | 887 | _iterative_dominators = true; |
duke@435 | 888 | } |
duke@435 | 889 | compute_dominator(std_entry, start_block); |
duke@435 | 890 | |
duke@435 | 891 | // start processing with standard entry block |
duke@435 | 892 | assert(_work_list.is_empty(), "list must be empty before processing"); |
duke@435 | 893 | |
duke@435 | 894 | if (ready_for_processing(std_entry)) { |
duke@435 | 895 | sort_into_work_list(std_entry); |
duke@435 | 896 | } else { |
duke@435 | 897 | assert(false, "the std_entry must be ready for processing (otherwise, the method has no start block)"); |
duke@435 | 898 | } |
duke@435 | 899 | |
duke@435 | 900 | do { |
duke@435 | 901 | BlockBegin* cur = _work_list.pop(); |
duke@435 | 902 | |
duke@435 | 903 | if (cur == sux_of_osr_entry) { |
duke@435 | 904 | // the osr entry block is ignored in normal processing, it is never added to the |
duke@435 | 905 | // work list. Instead, it is added as late as possible manually here. |
duke@435 | 906 | append_block(osr_entry); |
duke@435 | 907 | compute_dominator(cur, osr_entry); |
duke@435 | 908 | } |
duke@435 | 909 | append_block(cur); |
duke@435 | 910 | |
duke@435 | 911 | int i; |
duke@435 | 912 | int num_sux = cur->number_of_sux(); |
duke@435 | 913 | // changed loop order to get "intuitive" order of if- and else-blocks |
duke@435 | 914 | for (i = 0; i < num_sux; i++) { |
duke@435 | 915 | BlockBegin* sux = cur->sux_at(i); |
duke@435 | 916 | compute_dominator(sux, cur); |
duke@435 | 917 | if (ready_for_processing(sux)) { |
duke@435 | 918 | sort_into_work_list(sux); |
duke@435 | 919 | } |
duke@435 | 920 | } |
duke@435 | 921 | num_sux = cur->number_of_exception_handlers(); |
duke@435 | 922 | for (i = 0; i < num_sux; i++) { |
duke@435 | 923 | BlockBegin* sux = cur->exception_handler_at(i); |
duke@435 | 924 | compute_dominator(sux, cur); |
duke@435 | 925 | if (ready_for_processing(sux)) { |
duke@435 | 926 | sort_into_work_list(sux); |
duke@435 | 927 | } |
duke@435 | 928 | } |
duke@435 | 929 | } while (_work_list.length() > 0); |
duke@435 | 930 | } |
duke@435 | 931 | |
duke@435 | 932 | |
duke@435 | 933 | bool ComputeLinearScanOrder::compute_dominators_iter() { |
duke@435 | 934 | bool changed = false; |
duke@435 | 935 | int num_blocks = _linear_scan_order->length(); |
duke@435 | 936 | |
duke@435 | 937 | assert(_linear_scan_order->at(0)->dominator() == NULL, "must not have dominator"); |
duke@435 | 938 | assert(_linear_scan_order->at(0)->number_of_preds() == 0, "must not have predecessors"); |
duke@435 | 939 | for (int i = 1; i < num_blocks; i++) { |
duke@435 | 940 | BlockBegin* block = _linear_scan_order->at(i); |
duke@435 | 941 | |
duke@435 | 942 | BlockBegin* dominator = block->pred_at(0); |
duke@435 | 943 | int num_preds = block->number_of_preds(); |
duke@435 | 944 | for (int i = 1; i < num_preds; i++) { |
duke@435 | 945 | dominator = common_dominator(dominator, block->pred_at(i)); |
duke@435 | 946 | } |
duke@435 | 947 | |
duke@435 | 948 | if (dominator != block->dominator()) { |
duke@435 | 949 | TRACE_LINEAR_SCAN(4, tty->print_cr("DOM: updating dominator of B%d from B%d to B%d", block->block_id(), block->dominator()->block_id(), dominator->block_id())); |
duke@435 | 950 | |
duke@435 | 951 | block->set_dominator(dominator); |
duke@435 | 952 | changed = true; |
duke@435 | 953 | } |
duke@435 | 954 | } |
duke@435 | 955 | return changed; |
duke@435 | 956 | } |
duke@435 | 957 | |
duke@435 | 958 | void ComputeLinearScanOrder::compute_dominators() { |
duke@435 | 959 | TRACE_LINEAR_SCAN(3, tty->print_cr("----- computing dominators (iterative computation reqired: %d)", _iterative_dominators)); |
duke@435 | 960 | |
duke@435 | 961 | // iterative computation of dominators is only required for methods with non-natural loops |
duke@435 | 962 | // and OSR-methods. For all other methods, the dominators computed when generating the |
duke@435 | 963 | // linear scan block order are correct. |
duke@435 | 964 | if (_iterative_dominators) { |
duke@435 | 965 | do { |
duke@435 | 966 | TRACE_LINEAR_SCAN(1, tty->print_cr("DOM: next iteration of fix-point calculation")); |
duke@435 | 967 | } while (compute_dominators_iter()); |
duke@435 | 968 | } |
duke@435 | 969 | |
duke@435 | 970 | // check that dominators are correct |
duke@435 | 971 | assert(!compute_dominators_iter(), "fix point not reached"); |
duke@435 | 972 | } |
duke@435 | 973 | |
duke@435 | 974 | |
duke@435 | 975 | #ifndef PRODUCT |
duke@435 | 976 | void ComputeLinearScanOrder::print_blocks() { |
duke@435 | 977 | if (TraceLinearScanLevel >= 2) { |
duke@435 | 978 | tty->print_cr("----- loop information:"); |
duke@435 | 979 | for (int block_idx = 0; block_idx < _linear_scan_order->length(); block_idx++) { |
duke@435 | 980 | BlockBegin* cur = _linear_scan_order->at(block_idx); |
duke@435 | 981 | |
duke@435 | 982 | tty->print("%4d: B%2d: ", cur->linear_scan_number(), cur->block_id()); |
duke@435 | 983 | for (int loop_idx = 0; loop_idx < _num_loops; loop_idx++) { |
duke@435 | 984 | tty->print ("%d ", is_block_in_loop(loop_idx, cur)); |
duke@435 | 985 | } |
duke@435 | 986 | tty->print_cr(" -> loop_index: %2d, loop_depth: %2d", cur->loop_index(), cur->loop_depth()); |
duke@435 | 987 | } |
duke@435 | 988 | } |
duke@435 | 989 | |
duke@435 | 990 | if (TraceLinearScanLevel >= 1) { |
duke@435 | 991 | tty->print_cr("----- linear-scan block order:"); |
duke@435 | 992 | for (int block_idx = 0; block_idx < _linear_scan_order->length(); block_idx++) { |
duke@435 | 993 | BlockBegin* cur = _linear_scan_order->at(block_idx); |
duke@435 | 994 | tty->print("%4d: B%2d loop: %2d depth: %2d", cur->linear_scan_number(), cur->block_id(), cur->loop_index(), cur->loop_depth()); |
duke@435 | 995 | |
duke@435 | 996 | tty->print(cur->is_set(BlockBegin::exception_entry_flag) ? " ex" : " "); |
duke@435 | 997 | tty->print(cur->is_set(BlockBegin::critical_edge_split_flag) ? " ce" : " "); |
duke@435 | 998 | tty->print(cur->is_set(BlockBegin::linear_scan_loop_header_flag) ? " lh" : " "); |
duke@435 | 999 | tty->print(cur->is_set(BlockBegin::linear_scan_loop_end_flag) ? " le" : " "); |
duke@435 | 1000 | |
duke@435 | 1001 | if (cur->dominator() != NULL) { |
duke@435 | 1002 | tty->print(" dom: B%d ", cur->dominator()->block_id()); |
duke@435 | 1003 | } else { |
duke@435 | 1004 | tty->print(" dom: NULL "); |
duke@435 | 1005 | } |
duke@435 | 1006 | |
duke@435 | 1007 | if (cur->number_of_preds() > 0) { |
duke@435 | 1008 | tty->print(" preds: "); |
duke@435 | 1009 | for (int j = 0; j < cur->number_of_preds(); j++) { |
duke@435 | 1010 | BlockBegin* pred = cur->pred_at(j); |
duke@435 | 1011 | tty->print("B%d ", pred->block_id()); |
duke@435 | 1012 | } |
duke@435 | 1013 | } |
duke@435 | 1014 | if (cur->number_of_sux() > 0) { |
duke@435 | 1015 | tty->print(" sux: "); |
duke@435 | 1016 | for (int j = 0; j < cur->number_of_sux(); j++) { |
duke@435 | 1017 | BlockBegin* sux = cur->sux_at(j); |
duke@435 | 1018 | tty->print("B%d ", sux->block_id()); |
duke@435 | 1019 | } |
duke@435 | 1020 | } |
duke@435 | 1021 | if (cur->number_of_exception_handlers() > 0) { |
duke@435 | 1022 | tty->print(" ex: "); |
duke@435 | 1023 | for (int j = 0; j < cur->number_of_exception_handlers(); j++) { |
duke@435 | 1024 | BlockBegin* ex = cur->exception_handler_at(j); |
duke@435 | 1025 | tty->print("B%d ", ex->block_id()); |
duke@435 | 1026 | } |
duke@435 | 1027 | } |
duke@435 | 1028 | tty->cr(); |
duke@435 | 1029 | } |
duke@435 | 1030 | } |
duke@435 | 1031 | } |
duke@435 | 1032 | #endif |
duke@435 | 1033 | |
duke@435 | 1034 | #ifdef ASSERT |
duke@435 | 1035 | void ComputeLinearScanOrder::verify() { |
duke@435 | 1036 | assert(_linear_scan_order->length() == _num_blocks, "wrong number of blocks in list"); |
duke@435 | 1037 | |
duke@435 | 1038 | if (StressLinearScan) { |
duke@435 | 1039 | // blocks are scrambled when StressLinearScan is used |
duke@435 | 1040 | return; |
duke@435 | 1041 | } |
duke@435 | 1042 | |
duke@435 | 1043 | // check that all successors of a block have a higher linear-scan-number |
duke@435 | 1044 | // and that all predecessors of a block have a lower linear-scan-number |
duke@435 | 1045 | // (only backward branches of loops are ignored) |
duke@435 | 1046 | int i; |
duke@435 | 1047 | for (i = 0; i < _linear_scan_order->length(); i++) { |
duke@435 | 1048 | BlockBegin* cur = _linear_scan_order->at(i); |
duke@435 | 1049 | |
duke@435 | 1050 | assert(cur->linear_scan_number() == i, "incorrect linear_scan_number"); |
duke@435 | 1051 | assert(cur->linear_scan_number() >= 0 && cur->linear_scan_number() == _linear_scan_order->index_of(cur), "incorrect linear_scan_number"); |
duke@435 | 1052 | |
duke@435 | 1053 | int j; |
duke@435 | 1054 | for (j = cur->number_of_sux() - 1; j >= 0; j--) { |
duke@435 | 1055 | BlockBegin* sux = cur->sux_at(j); |
duke@435 | 1056 | |
duke@435 | 1057 | assert(sux->linear_scan_number() >= 0 && sux->linear_scan_number() == _linear_scan_order->index_of(sux), "incorrect linear_scan_number"); |
duke@435 | 1058 | if (!cur->is_set(BlockBegin::linear_scan_loop_end_flag)) { |
duke@435 | 1059 | assert(cur->linear_scan_number() < sux->linear_scan_number(), "invalid order"); |
duke@435 | 1060 | } |
duke@435 | 1061 | if (cur->loop_depth() == sux->loop_depth()) { |
duke@435 | 1062 | assert(cur->loop_index() == sux->loop_index() || sux->is_set(BlockBegin::linear_scan_loop_header_flag), "successing blocks with same loop depth must have same loop index"); |
duke@435 | 1063 | } |
duke@435 | 1064 | } |
duke@435 | 1065 | |
duke@435 | 1066 | for (j = cur->number_of_preds() - 1; j >= 0; j--) { |
duke@435 | 1067 | BlockBegin* pred = cur->pred_at(j); |
duke@435 | 1068 | |
duke@435 | 1069 | assert(pred->linear_scan_number() >= 0 && pred->linear_scan_number() == _linear_scan_order->index_of(pred), "incorrect linear_scan_number"); |
duke@435 | 1070 | if (!cur->is_set(BlockBegin::linear_scan_loop_header_flag)) { |
duke@435 | 1071 | assert(cur->linear_scan_number() > pred->linear_scan_number(), "invalid order"); |
duke@435 | 1072 | } |
duke@435 | 1073 | if (cur->loop_depth() == pred->loop_depth()) { |
duke@435 | 1074 | assert(cur->loop_index() == pred->loop_index() || cur->is_set(BlockBegin::linear_scan_loop_header_flag), "successing blocks with same loop depth must have same loop index"); |
duke@435 | 1075 | } |
duke@435 | 1076 | |
duke@435 | 1077 | assert(cur->dominator()->linear_scan_number() <= cur->pred_at(j)->linear_scan_number(), "dominator must be before predecessors"); |
duke@435 | 1078 | } |
duke@435 | 1079 | |
duke@435 | 1080 | // check dominator |
duke@435 | 1081 | if (i == 0) { |
duke@435 | 1082 | assert(cur->dominator() == NULL, "first block has no dominator"); |
duke@435 | 1083 | } else { |
duke@435 | 1084 | assert(cur->dominator() != NULL, "all but first block must have dominator"); |
duke@435 | 1085 | } |
duke@435 | 1086 | assert(cur->number_of_preds() != 1 || cur->dominator() == cur->pred_at(0), "Single predecessor must also be dominator"); |
duke@435 | 1087 | } |
duke@435 | 1088 | |
duke@435 | 1089 | // check that all loops are continuous |
duke@435 | 1090 | for (int loop_idx = 0; loop_idx < _num_loops; loop_idx++) { |
duke@435 | 1091 | int block_idx = 0; |
duke@435 | 1092 | assert(!is_block_in_loop(loop_idx, _linear_scan_order->at(block_idx)), "the first block must not be present in any loop"); |
duke@435 | 1093 | |
duke@435 | 1094 | // skip blocks before the loop |
duke@435 | 1095 | while (block_idx < _num_blocks && !is_block_in_loop(loop_idx, _linear_scan_order->at(block_idx))) { |
duke@435 | 1096 | block_idx++; |
duke@435 | 1097 | } |
duke@435 | 1098 | // skip blocks of loop |
duke@435 | 1099 | while (block_idx < _num_blocks && is_block_in_loop(loop_idx, _linear_scan_order->at(block_idx))) { |
duke@435 | 1100 | block_idx++; |
duke@435 | 1101 | } |
duke@435 | 1102 | // after the first non-loop block, there must not be another loop-block |
duke@435 | 1103 | while (block_idx < _num_blocks) { |
duke@435 | 1104 | assert(!is_block_in_loop(loop_idx, _linear_scan_order->at(block_idx)), "loop not continuous in linear-scan order"); |
duke@435 | 1105 | block_idx++; |
duke@435 | 1106 | } |
duke@435 | 1107 | } |
duke@435 | 1108 | } |
duke@435 | 1109 | #endif |
duke@435 | 1110 | |
duke@435 | 1111 | |
duke@435 | 1112 | void IR::compute_code() { |
duke@435 | 1113 | assert(is_valid(), "IR must be valid"); |
duke@435 | 1114 | |
duke@435 | 1115 | ComputeLinearScanOrder compute_order(start()); |
duke@435 | 1116 | _num_loops = compute_order.num_loops(); |
duke@435 | 1117 | _code = compute_order.linear_scan_order(); |
duke@435 | 1118 | } |
duke@435 | 1119 | |
duke@435 | 1120 | |
duke@435 | 1121 | void IR::compute_use_counts() { |
duke@435 | 1122 | // make sure all values coming out of this block get evaluated. |
duke@435 | 1123 | int num_blocks = _code->length(); |
duke@435 | 1124 | for (int i = 0; i < num_blocks; i++) { |
duke@435 | 1125 | _code->at(i)->end()->state()->pin_stack_for_linear_scan(); |
duke@435 | 1126 | } |
duke@435 | 1127 | |
duke@435 | 1128 | // compute use counts |
duke@435 | 1129 | UseCountComputer::compute(_code); |
duke@435 | 1130 | } |
duke@435 | 1131 | |
duke@435 | 1132 | |
duke@435 | 1133 | void IR::iterate_preorder(BlockClosure* closure) { |
duke@435 | 1134 | assert(is_valid(), "IR must be valid"); |
duke@435 | 1135 | start()->iterate_preorder(closure); |
duke@435 | 1136 | } |
duke@435 | 1137 | |
duke@435 | 1138 | |
duke@435 | 1139 | void IR::iterate_postorder(BlockClosure* closure) { |
duke@435 | 1140 | assert(is_valid(), "IR must be valid"); |
duke@435 | 1141 | start()->iterate_postorder(closure); |
duke@435 | 1142 | } |
duke@435 | 1143 | |
duke@435 | 1144 | void IR::iterate_linear_scan_order(BlockClosure* closure) { |
duke@435 | 1145 | linear_scan_order()->iterate_forward(closure); |
duke@435 | 1146 | } |
duke@435 | 1147 | |
duke@435 | 1148 | |
duke@435 | 1149 | #ifndef PRODUCT |
duke@435 | 1150 | class BlockPrinter: public BlockClosure { |
duke@435 | 1151 | private: |
duke@435 | 1152 | InstructionPrinter* _ip; |
duke@435 | 1153 | bool _cfg_only; |
duke@435 | 1154 | bool _live_only; |
duke@435 | 1155 | |
duke@435 | 1156 | public: |
duke@435 | 1157 | BlockPrinter(InstructionPrinter* ip, bool cfg_only, bool live_only = false) { |
duke@435 | 1158 | _ip = ip; |
duke@435 | 1159 | _cfg_only = cfg_only; |
duke@435 | 1160 | _live_only = live_only; |
duke@435 | 1161 | } |
duke@435 | 1162 | |
duke@435 | 1163 | virtual void block_do(BlockBegin* block) { |
duke@435 | 1164 | if (_cfg_only) { |
duke@435 | 1165 | _ip->print_instr(block); tty->cr(); |
duke@435 | 1166 | } else { |
duke@435 | 1167 | block->print_block(*_ip, _live_only); |
duke@435 | 1168 | } |
duke@435 | 1169 | } |
duke@435 | 1170 | }; |
duke@435 | 1171 | |
duke@435 | 1172 | |
duke@435 | 1173 | void IR::print(BlockBegin* start, bool cfg_only, bool live_only) { |
duke@435 | 1174 | ttyLocker ttyl; |
duke@435 | 1175 | InstructionPrinter ip(!cfg_only); |
duke@435 | 1176 | BlockPrinter bp(&ip, cfg_only, live_only); |
duke@435 | 1177 | start->iterate_preorder(&bp); |
duke@435 | 1178 | tty->cr(); |
duke@435 | 1179 | } |
duke@435 | 1180 | |
duke@435 | 1181 | void IR::print(bool cfg_only, bool live_only) { |
duke@435 | 1182 | if (is_valid()) { |
duke@435 | 1183 | print(start(), cfg_only, live_only); |
duke@435 | 1184 | } else { |
duke@435 | 1185 | tty->print_cr("invalid IR"); |
duke@435 | 1186 | } |
duke@435 | 1187 | } |
duke@435 | 1188 | |
duke@435 | 1189 | |
duke@435 | 1190 | define_array(BlockListArray, BlockList*) |
duke@435 | 1191 | define_stack(BlockListList, BlockListArray) |
duke@435 | 1192 | |
duke@435 | 1193 | class PredecessorValidator : public BlockClosure { |
duke@435 | 1194 | private: |
duke@435 | 1195 | BlockListList* _predecessors; |
duke@435 | 1196 | BlockList* _blocks; |
duke@435 | 1197 | |
duke@435 | 1198 | static int cmp(BlockBegin** a, BlockBegin** b) { |
duke@435 | 1199 | return (*a)->block_id() - (*b)->block_id(); |
duke@435 | 1200 | } |
duke@435 | 1201 | |
duke@435 | 1202 | public: |
duke@435 | 1203 | PredecessorValidator(IR* hir) { |
duke@435 | 1204 | ResourceMark rm; |
duke@435 | 1205 | _predecessors = new BlockListList(BlockBegin::number_of_blocks(), NULL); |
duke@435 | 1206 | _blocks = new BlockList(); |
duke@435 | 1207 | |
duke@435 | 1208 | int i; |
duke@435 | 1209 | hir->start()->iterate_preorder(this); |
duke@435 | 1210 | if (hir->code() != NULL) { |
duke@435 | 1211 | assert(hir->code()->length() == _blocks->length(), "must match"); |
duke@435 | 1212 | for (i = 0; i < _blocks->length(); i++) { |
duke@435 | 1213 | assert(hir->code()->contains(_blocks->at(i)), "should be in both lists"); |
duke@435 | 1214 | } |
duke@435 | 1215 | } |
duke@435 | 1216 | |
duke@435 | 1217 | for (i = 0; i < _blocks->length(); i++) { |
duke@435 | 1218 | BlockBegin* block = _blocks->at(i); |
duke@435 | 1219 | BlockList* preds = _predecessors->at(block->block_id()); |
duke@435 | 1220 | if (preds == NULL) { |
duke@435 | 1221 | assert(block->number_of_preds() == 0, "should be the same"); |
duke@435 | 1222 | continue; |
duke@435 | 1223 | } |
duke@435 | 1224 | |
duke@435 | 1225 | // clone the pred list so we can mutate it |
duke@435 | 1226 | BlockList* pred_copy = new BlockList(); |
duke@435 | 1227 | int j; |
duke@435 | 1228 | for (j = 0; j < block->number_of_preds(); j++) { |
duke@435 | 1229 | pred_copy->append(block->pred_at(j)); |
duke@435 | 1230 | } |
duke@435 | 1231 | // sort them in the same order |
duke@435 | 1232 | preds->sort(cmp); |
duke@435 | 1233 | pred_copy->sort(cmp); |
duke@435 | 1234 | int length = MIN2(preds->length(), block->number_of_preds()); |
duke@435 | 1235 | for (j = 0; j < block->number_of_preds(); j++) { |
duke@435 | 1236 | assert(preds->at(j) == pred_copy->at(j), "must match"); |
duke@435 | 1237 | } |
duke@435 | 1238 | |
duke@435 | 1239 | assert(preds->length() == block->number_of_preds(), "should be the same"); |
duke@435 | 1240 | } |
duke@435 | 1241 | } |
duke@435 | 1242 | |
duke@435 | 1243 | virtual void block_do(BlockBegin* block) { |
duke@435 | 1244 | _blocks->append(block); |
duke@435 | 1245 | BlockEnd* be = block->end(); |
duke@435 | 1246 | int n = be->number_of_sux(); |
duke@435 | 1247 | int i; |
duke@435 | 1248 | for (i = 0; i < n; i++) { |
duke@435 | 1249 | BlockBegin* sux = be->sux_at(i); |
duke@435 | 1250 | assert(!sux->is_set(BlockBegin::exception_entry_flag), "must not be xhandler"); |
duke@435 | 1251 | |
duke@435 | 1252 | BlockList* preds = _predecessors->at_grow(sux->block_id(), NULL); |
duke@435 | 1253 | if (preds == NULL) { |
duke@435 | 1254 | preds = new BlockList(); |
duke@435 | 1255 | _predecessors->at_put(sux->block_id(), preds); |
duke@435 | 1256 | } |
duke@435 | 1257 | preds->append(block); |
duke@435 | 1258 | } |
duke@435 | 1259 | |
duke@435 | 1260 | n = block->number_of_exception_handlers(); |
duke@435 | 1261 | for (i = 0; i < n; i++) { |
duke@435 | 1262 | BlockBegin* sux = block->exception_handler_at(i); |
duke@435 | 1263 | assert(sux->is_set(BlockBegin::exception_entry_flag), "must be xhandler"); |
duke@435 | 1264 | |
duke@435 | 1265 | BlockList* preds = _predecessors->at_grow(sux->block_id(), NULL); |
duke@435 | 1266 | if (preds == NULL) { |
duke@435 | 1267 | preds = new BlockList(); |
duke@435 | 1268 | _predecessors->at_put(sux->block_id(), preds); |
duke@435 | 1269 | } |
duke@435 | 1270 | preds->append(block); |
duke@435 | 1271 | } |
duke@435 | 1272 | } |
duke@435 | 1273 | }; |
duke@435 | 1274 | |
duke@435 | 1275 | void IR::verify() { |
duke@435 | 1276 | #ifdef ASSERT |
duke@435 | 1277 | PredecessorValidator pv(this); |
duke@435 | 1278 | #endif |
duke@435 | 1279 | } |
duke@435 | 1280 | |
duke@435 | 1281 | #endif // PRODUCT |
duke@435 | 1282 | |
duke@435 | 1283 | void SubstitutionResolver::substitute(Value* v) { |
duke@435 | 1284 | Value v0 = *v; |
duke@435 | 1285 | if (v0) { |
duke@435 | 1286 | Value vs = v0->subst(); |
duke@435 | 1287 | if (vs != v0) { |
duke@435 | 1288 | *v = v0->subst(); |
duke@435 | 1289 | } |
duke@435 | 1290 | } |
duke@435 | 1291 | } |
duke@435 | 1292 | |
duke@435 | 1293 | #ifdef ASSERT |
duke@435 | 1294 | void check_substitute(Value* v) { |
duke@435 | 1295 | Value v0 = *v; |
duke@435 | 1296 | if (v0) { |
duke@435 | 1297 | Value vs = v0->subst(); |
duke@435 | 1298 | assert(vs == v0, "missed substitution"); |
duke@435 | 1299 | } |
duke@435 | 1300 | } |
duke@435 | 1301 | #endif |
duke@435 | 1302 | |
duke@435 | 1303 | |
duke@435 | 1304 | void SubstitutionResolver::block_do(BlockBegin* block) { |
duke@435 | 1305 | Instruction* last = NULL; |
duke@435 | 1306 | for (Instruction* n = block; n != NULL;) { |
duke@435 | 1307 | n->values_do(substitute); |
duke@435 | 1308 | // need to remove this instruction from the instruction stream |
duke@435 | 1309 | if (n->subst() != n) { |
duke@435 | 1310 | assert(last != NULL, "must have last"); |
duke@435 | 1311 | last->set_next(n->next(), n->next()->bci()); |
duke@435 | 1312 | } else { |
duke@435 | 1313 | last = n; |
duke@435 | 1314 | } |
duke@435 | 1315 | n = last->next(); |
duke@435 | 1316 | } |
duke@435 | 1317 | |
duke@435 | 1318 | #ifdef ASSERT |
duke@435 | 1319 | if (block->state()) block->state()->values_do(check_substitute); |
duke@435 | 1320 | block->block_values_do(check_substitute); |
duke@435 | 1321 | if (block->end() && block->end()->state()) block->end()->state()->values_do(check_substitute); |
duke@435 | 1322 | #endif |
duke@435 | 1323 | } |