annotate hotspot/src/share/vm/opto/parse1.cpp @ 2867:69187054225f

6788527: Server vm intermittently fails with assertion "live value must not be garbage" with fastdebug bits Summary: Cache Jvmti and DTrace flags used by Compiler. Reviewed-by: never
author kvn
date Fri, 08 May 2009 10:44:20 -0700
parents ecc7862946d4
children c7d5aae8d3f7
rev   line source
duke@1 1 /*
xdono@670 2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
duke@1 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@1 4 *
duke@1 5 * This code is free software; you can redistribute it and/or modify it
duke@1 6 * under the terms of the GNU General Public License version 2 only, as
duke@1 7 * published by the Free Software Foundation.
duke@1 8 *
duke@1 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@1 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@1 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@1 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@1 13 * accompanied this code).
duke@1 14 *
duke@1 15 * You should have received a copy of the GNU General Public License version
duke@1 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@1 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@1 18 *
duke@1 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@1 20 * CA 95054 USA or visit www.sun.com if you need additional information or
duke@1 21 * have any questions.
duke@1 22 *
duke@1 23 */
duke@1 24
duke@1 25 #include "incls/_precompiled.incl"
duke@1 26 #include "incls/_parse1.cpp.incl"
duke@1 27
duke@1 28 // Static array so we can figure out which bytecodes stop us from compiling
duke@1 29 // the most. Some of the non-static variables are needed in bytecodeInfo.cpp
duke@1 30 // and eventually should be encapsulated in a proper class (gri 8/18/98).
duke@1 31
never@1399 32 int nodes_created = 0;
never@1399 33 int methods_parsed = 0;
never@1399 34 int methods_seen = 0;
never@1399 35 int blocks_parsed = 0;
never@1399 36 int blocks_seen = 0;
duke@1 37
never@1399 38 int explicit_null_checks_inserted = 0;
never@1399 39 int explicit_null_checks_elided = 0;
duke@1 40 int all_null_checks_found = 0, implicit_null_checks = 0;
duke@1 41 int implicit_null_throws = 0;
duke@1 42
duke@1 43 int reclaim_idx = 0;
duke@1 44 int reclaim_in = 0;
duke@1 45 int reclaim_node = 0;
duke@1 46
duke@1 47 #ifndef PRODUCT
duke@1 48 bool Parse::BytecodeParseHistogram::_initialized = false;
duke@1 49 uint Parse::BytecodeParseHistogram::_bytecodes_parsed [Bytecodes::number_of_codes];
duke@1 50 uint Parse::BytecodeParseHistogram::_nodes_constructed[Bytecodes::number_of_codes];
duke@1 51 uint Parse::BytecodeParseHistogram::_nodes_transformed[Bytecodes::number_of_codes];
duke@1 52 uint Parse::BytecodeParseHistogram::_new_values [Bytecodes::number_of_codes];
duke@1 53 #endif
duke@1 54
duke@1 55 //------------------------------print_statistics-------------------------------
duke@1 56 #ifndef PRODUCT
duke@1 57 void Parse::print_statistics() {
duke@1 58 tty->print_cr("--- Compiler Statistics ---");
duke@1 59 tty->print("Methods seen: %d Methods parsed: %d", methods_seen, methods_parsed);
duke@1 60 tty->print(" Nodes created: %d", nodes_created);
duke@1 61 tty->cr();
duke@1 62 if (methods_seen != methods_parsed)
duke@1 63 tty->print_cr("Reasons for parse failures (NOT cumulative):");
never@1399 64 tty->print_cr("Blocks parsed: %d Blocks seen: %d", blocks_parsed, blocks_seen);
duke@1 65
duke@1 66 if( explicit_null_checks_inserted )
duke@1 67 tty->print_cr("%d original NULL checks - %d elided (%2d%%); optimizer leaves %d,", explicit_null_checks_inserted, explicit_null_checks_elided, (100*explicit_null_checks_elided)/explicit_null_checks_inserted, all_null_checks_found);
duke@1 68 if( all_null_checks_found )
duke@1 69 tty->print_cr("%d made implicit (%2d%%)", implicit_null_checks,
duke@1 70 (100*implicit_null_checks)/all_null_checks_found);
duke@1 71 if( implicit_null_throws )
duke@1 72 tty->print_cr("%d implicit null exceptions at runtime",
duke@1 73 implicit_null_throws);
duke@1 74
duke@1 75 if( PrintParseStatistics && BytecodeParseHistogram::initialized() ) {
duke@1 76 BytecodeParseHistogram::print();
duke@1 77 }
duke@1 78 }
duke@1 79 #endif
duke@1 80
duke@1 81 //------------------------------ON STACK REPLACEMENT---------------------------
duke@1 82
duke@1 83 // Construct a node which can be used to get incoming state for
duke@1 84 // on stack replacement.
duke@1 85 Node *Parse::fetch_interpreter_state(int index,
duke@1 86 BasicType bt,
duke@1 87 Node *local_addrs,
duke@1 88 Node *local_addrs_base) {
duke@1 89 Node *mem = memory(Compile::AliasIdxRaw);
duke@1 90 Node *adr = basic_plus_adr( local_addrs_base, local_addrs, -index*wordSize );
duke@1 91
duke@1 92 // Very similar to LoadNode::make, except we handle un-aligned longs and
duke@1 93 // doubles on Sparc. Intel can handle them just fine directly.
duke@1 94 Node *l;
duke@1 95 switch( bt ) { // Signature is flattened
duke@1 96 case T_INT: l = new (C, 3) LoadINode( 0, mem, adr, TypeRawPtr::BOTTOM ); break;
duke@1 97 case T_FLOAT: l = new (C, 3) LoadFNode( 0, mem, adr, TypeRawPtr::BOTTOM ); break;
never@2351 98 case T_ADDRESS: l = new (C, 3) LoadPNode( 0, mem, adr, TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM ); break;
duke@1 99 case T_OBJECT: l = new (C, 3) LoadPNode( 0, mem, adr, TypeRawPtr::BOTTOM, TypeInstPtr::BOTTOM ); break;
duke@1 100 case T_LONG:
duke@1 101 case T_DOUBLE: {
duke@1 102 // Since arguments are in reverse order, the argument address 'adr'
duke@1 103 // refers to the back half of the long/double. Recompute adr.
duke@1 104 adr = basic_plus_adr( local_addrs_base, local_addrs, -(index+1)*wordSize );
duke@1 105 if( Matcher::misaligned_doubles_ok ) {
duke@1 106 l = (bt == T_DOUBLE)
duke@1 107 ? (Node*)new (C, 3) LoadDNode( 0, mem, adr, TypeRawPtr::BOTTOM )
duke@1 108 : (Node*)new (C, 3) LoadLNode( 0, mem, adr, TypeRawPtr::BOTTOM );
duke@1 109 } else {
duke@1 110 l = (bt == T_DOUBLE)
duke@1 111 ? (Node*)new (C, 3) LoadD_unalignedNode( 0, mem, adr, TypeRawPtr::BOTTOM )
duke@1 112 : (Node*)new (C, 3) LoadL_unalignedNode( 0, mem, adr, TypeRawPtr::BOTTOM );
duke@1 113 }
duke@1 114 break;
duke@1 115 }
duke@1 116 default: ShouldNotReachHere();
duke@1 117 }
duke@1 118 return _gvn.transform(l);
duke@1 119 }
duke@1 120
duke@1 121 // Helper routine to prevent the interpreter from handing
duke@1 122 // unexpected typestate to an OSR method.
duke@1 123 // The Node l is a value newly dug out of the interpreter frame.
duke@1 124 // The type is the type predicted by ciTypeFlow. Note that it is
duke@1 125 // not a general type, but can only come from Type::get_typeflow_type.
duke@1 126 // The safepoint is a map which will feed an uncommon trap.
duke@1 127 Node* Parse::check_interpreter_type(Node* l, const Type* type,
duke@1 128 SafePointNode* &bad_type_exit) {
duke@1 129
duke@1 130 const TypeOopPtr* tp = type->isa_oopptr();
duke@1 131
duke@1 132 // TypeFlow may assert null-ness if a type appears unloaded.
duke@1 133 if (type == TypePtr::NULL_PTR ||
duke@1 134 (tp != NULL && !tp->klass()->is_loaded())) {
duke@1 135 // Value must be null, not a real oop.
duke@1 136 Node* chk = _gvn.transform( new (C, 3) CmpPNode(l, null()) );
duke@1 137 Node* tst = _gvn.transform( new (C, 2) BoolNode(chk, BoolTest::eq) );
duke@1 138 IfNode* iff = create_and_map_if(control(), tst, PROB_MAX, COUNT_UNKNOWN);
duke@1 139 set_control(_gvn.transform( new (C, 1) IfTrueNode(iff) ));
duke@1 140 Node* bad_type = _gvn.transform( new (C, 1) IfFalseNode(iff) );
duke@1 141 bad_type_exit->control()->add_req(bad_type);
duke@1 142 l = null();
duke@1 143 }
duke@1 144
duke@1 145 // Typeflow can also cut off paths from the CFG, based on
duke@1 146 // types which appear unloaded, or call sites which appear unlinked.
duke@1 147 // When paths are cut off, values at later merge points can rise
duke@1 148 // toward more specific classes. Make sure these specific classes
duke@1 149 // are still in effect.
duke@1 150 if (tp != NULL && tp->klass() != C->env()->Object_klass()) {
duke@1 151 // TypeFlow asserted a specific object type. Value must have that type.
duke@1 152 Node* bad_type_ctrl = NULL;
duke@1 153 l = gen_checkcast(l, makecon(TypeKlassPtr::make(tp->klass())), &bad_type_ctrl);
duke@1 154 bad_type_exit->control()->add_req(bad_type_ctrl);
duke@1 155 }
duke@1 156
duke@1 157 BasicType bt_l = _gvn.type(l)->basic_type();
duke@1 158 BasicType bt_t = type->basic_type();
duke@1 159 assert(_gvn.type(l)->higher_equal(type), "must constrain OSR typestate");
duke@1 160 return l;
duke@1 161 }
duke@1 162
duke@1 163 // Helper routine which sets up elements of the initial parser map when
duke@1 164 // performing a parse for on stack replacement. Add values into map.
duke@1 165 // The only parameter contains the address of a interpreter arguments.
duke@1 166 void Parse::load_interpreter_state(Node* osr_buf) {
duke@1 167 int index;
duke@1 168 int max_locals = jvms()->loc_size();
duke@1 169 int max_stack = jvms()->stk_size();
duke@1 170
duke@1 171
duke@1 172 // Mismatch between method and jvms can occur since map briefly held
duke@1 173 // an OSR entry state (which takes up one RawPtr word).
duke@1 174 assert(max_locals == method()->max_locals(), "sanity");
duke@1 175 assert(max_stack >= method()->max_stack(), "sanity");
duke@1 176 assert((int)jvms()->endoff() == TypeFunc::Parms + max_locals + max_stack, "sanity");
duke@1 177 assert((int)jvms()->endoff() == (int)map()->req(), "sanity");
duke@1 178
duke@1 179 // Find the start block.
duke@1 180 Block* osr_block = start_block();
duke@1 181 assert(osr_block->start() == osr_bci(), "sanity");
duke@1 182
duke@1 183 // Set initial BCI.
duke@1 184 set_parse_bci(osr_block->start());
duke@1 185
duke@1 186 // Set initial stack depth.
duke@1 187 set_sp(osr_block->start_sp());
duke@1 188
duke@1 189 // Check bailouts. We currently do not perform on stack replacement
duke@1 190 // of loops in catch blocks or loops which branch with a non-empty stack.
duke@1 191 if (sp() != 0) {
duke@1 192 C->record_method_not_compilable("OSR starts with non-empty stack");
duke@1 193 return;
duke@1 194 }
duke@1 195 // Do not OSR inside finally clauses:
duke@1 196 if (osr_block->has_trap_at(osr_block->start())) {
duke@1 197 C->record_method_not_compilable("OSR starts with an immediate trap");
duke@1 198 return;
duke@1 199 }
duke@1 200
duke@1 201 // Commute monitors from interpreter frame to compiler frame.
duke@1 202 assert(jvms()->monitor_depth() == 0, "should be no active locks at beginning of osr");
duke@1 203 int mcnt = osr_block->flow()->monitor_count();
duke@1 204 Node *monitors_addr = basic_plus_adr(osr_buf, osr_buf, (max_locals+mcnt*2-1)*wordSize);
duke@1 205 for (index = 0; index < mcnt; index++) {
duke@1 206 // Make a BoxLockNode for the monitor.
duke@1 207 Node *box = _gvn.transform(new (C, 1) BoxLockNode(next_monitor()));
duke@1 208
duke@1 209
duke@1 210 // Displaced headers and locked objects are interleaved in the
duke@1 211 // temp OSR buffer. We only copy the locked objects out here.
duke@1 212 // Fetch the locked object from the OSR temp buffer and copy to our fastlock node.
duke@1 213 Node *lock_object = fetch_interpreter_state(index*2, T_OBJECT, monitors_addr, osr_buf);
duke@1 214 // Try and copy the displaced header to the BoxNode
duke@1 215 Node *displaced_hdr = fetch_interpreter_state((index*2) + 1, T_ADDRESS, monitors_addr, osr_buf);
duke@1 216
duke@1 217
duke@1 218 store_to_memory(control(), box, displaced_hdr, T_ADDRESS, Compile::AliasIdxRaw);
duke@1 219
duke@1 220 // Build a bogus FastLockNode (no code will be generated) and push the
duke@1 221 // monitor into our debug info.
duke@1 222 const FastLockNode *flock = _gvn.transform(new (C, 3) FastLockNode( 0, lock_object, box ))->as_FastLock();
duke@1 223 map()->push_monitor(flock);
duke@1 224
duke@1 225 // If the lock is our method synchronization lock, tuck it away in
duke@1 226 // _sync_lock for return and rethrow exit paths.
duke@1 227 if (index == 0 && method()->is_synchronized()) {
duke@1 228 _synch_lock = flock;
duke@1 229 }
duke@1 230 }
duke@1 231
duke@1 232 MethodLivenessResult live_locals = method()->liveness_at_bci(osr_bci());
duke@1 233 if (!live_locals.is_valid()) {
duke@1 234 // Degenerate or breakpointed method.
duke@1 235 C->record_method_not_compilable("OSR in empty or breakpointed method");
duke@1 236 return;
duke@1 237 }
duke@1 238
duke@1 239 // Extract the needed locals from the interpreter frame.
duke@1 240 Node *locals_addr = basic_plus_adr(osr_buf, osr_buf, (max_locals-1)*wordSize);
duke@1 241
duke@1 242 // find all the locals that the interpreter thinks contain live oops
duke@1 243 const BitMap live_oops = method()->live_local_oops_at_bci(osr_bci());
duke@1 244 for (index = 0; index < max_locals; index++) {
duke@1 245
duke@1 246 if (!live_locals.at(index)) {
duke@1 247 continue;
duke@1 248 }
duke@1 249
duke@1 250 const Type *type = osr_block->local_type_at(index);
duke@1 251
duke@1 252 if (type->isa_oopptr() != NULL) {
duke@1 253
duke@1 254 // 6403625: Verify that the interpreter oopMap thinks that the oop is live
duke@1 255 // else we might load a stale oop if the MethodLiveness disagrees with the
duke@1 256 // result of the interpreter. If the interpreter says it is dead we agree
duke@1 257 // by making the value go to top.
duke@1 258 //
duke@1 259
duke@1 260 if (!live_oops.at(index)) {
duke@1 261 if (C->log() != NULL) {
duke@1 262 C->log()->elem("OSR_mismatch local_index='%d'",index);
duke@1 263 }
duke@1 264 set_local(index, null());
duke@1 265 // and ignore it for the loads
duke@1 266 continue;
duke@1 267 }
duke@1 268 }
duke@1 269
duke@1 270 // Filter out TOP, HALF, and BOTTOM. (Cf. ensure_phi.)
duke@1 271 if (type == Type::TOP || type == Type::HALF) {
duke@1 272 continue;
duke@1 273 }
duke@1 274 // If the type falls to bottom, then this must be a local that
duke@1 275 // is mixing ints and oops or some such. Forcing it to top
duke@1 276 // makes it go dead.
duke@1 277 if (type == Type::BOTTOM) {
duke@1 278 continue;
duke@1 279 }
duke@1 280 // Construct code to access the appropriate local.
duke@1 281 Node *value = fetch_interpreter_state(index, type->basic_type(), locals_addr, osr_buf);
duke@1 282 set_local(index, value);
duke@1 283 }
duke@1 284
duke@1 285 // Extract the needed stack entries from the interpreter frame.
duke@1 286 for (index = 0; index < sp(); index++) {
duke@1 287 const Type *type = osr_block->stack_type_at(index);
duke@1 288 if (type != Type::TOP) {
duke@1 289 // Currently the compiler bails out when attempting to on stack replace
duke@1 290 // at a bci with a non-empty stack. We should not reach here.
duke@1 291 ShouldNotReachHere();
duke@1 292 }
duke@1 293 }
duke@1 294
duke@1 295 // End the OSR migration
duke@1 296 make_runtime_call(RC_LEAF, OptoRuntime::osr_end_Type(),
duke@1 297 CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_end),
duke@1 298 "OSR_migration_end", TypeRawPtr::BOTTOM,
duke@1 299 osr_buf);
duke@1 300
duke@1 301 // Now that the interpreter state is loaded, make sure it will match
duke@1 302 // at execution time what the compiler is expecting now:
duke@1 303 SafePointNode* bad_type_exit = clone_map();
duke@1 304 bad_type_exit->set_control(new (C, 1) RegionNode(1));
duke@1 305
duke@1 306 for (index = 0; index < max_locals; index++) {
duke@1 307 if (stopped()) break;
duke@1 308 Node* l = local(index);
duke@1 309 if (l->is_top()) continue; // nothing here
duke@1 310 const Type *type = osr_block->local_type_at(index);
duke@1 311 if (type->isa_oopptr() != NULL) {
duke@1 312 if (!live_oops.at(index)) {
duke@1 313 // skip type check for dead oops
duke@1 314 continue;
duke@1 315 }
duke@1 316 }
duke@1 317 set_local(index, check_interpreter_type(l, type, bad_type_exit));
duke@1 318 }
duke@1 319
duke@1 320 for (index = 0; index < sp(); index++) {
duke@1 321 if (stopped()) break;
duke@1 322 Node* l = stack(index);
duke@1 323 if (l->is_top()) continue; // nothing here
duke@1 324 const Type *type = osr_block->stack_type_at(index);
duke@1 325 set_stack(index, check_interpreter_type(l, type, bad_type_exit));
duke@1 326 }
duke@1 327
duke@1 328 if (bad_type_exit->control()->req() > 1) {
duke@1 329 // Build an uncommon trap here, if any inputs can be unexpected.
duke@1 330 bad_type_exit->set_control(_gvn.transform( bad_type_exit->control() ));
duke@1 331 record_for_igvn(bad_type_exit->control());
duke@1 332 SafePointNode* types_are_good = map();
duke@1 333 set_map(bad_type_exit);
duke@1 334 // The unexpected type happens because a new edge is active
duke@1 335 // in the CFG, which typeflow had previously ignored.
duke@1 336 // E.g., Object x = coldAtFirst() && notReached()? "str": new Integer(123).
duke@1 337 // This x will be typed as Integer if notReached is not yet linked.
duke@1 338 uncommon_trap(Deoptimization::Reason_unreached,
duke@1 339 Deoptimization::Action_reinterpret);
duke@1 340 set_map(types_are_good);
duke@1 341 }
duke@1 342 }
duke@1 343
duke@1 344 //------------------------------Parse------------------------------------------
duke@1 345 // Main parser constructor.
duke@1 346 Parse::Parse(JVMState* caller, ciMethod* parse_method, float expected_uses)
duke@1 347 : _exits(caller)
duke@1 348 {
duke@1 349 // Init some variables
duke@1 350 _caller = caller;
duke@1 351 _method = parse_method;
duke@1 352 _expected_uses = expected_uses;
duke@1 353 _depth = 1 + (caller->has_method() ? caller->depth() : 0);
duke@1 354 _wrote_final = false;
duke@1 355 _entry_bci = InvocationEntryBci;
duke@1 356 _tf = NULL;
duke@1 357 _block = NULL;
duke@1 358 debug_only(_block_count = -1);
duke@1 359 debug_only(_blocks = (Block*)-1);
duke@1 360 #ifndef PRODUCT
duke@1 361 if (PrintCompilation || PrintOpto) {
duke@1 362 // Make sure I have an inline tree, so I can print messages about it.
duke@1 363 JVMState* ilt_caller = is_osr_parse() ? caller->caller() : caller;
duke@1 364 InlineTree::find_subtree_from_root(C->ilt(), ilt_caller, parse_method, true);
duke@1 365 }
duke@1 366 _max_switch_depth = 0;
duke@1 367 _est_switch_depth = 0;
duke@1 368 #endif
duke@1 369
duke@1 370 _tf = TypeFunc::make(method());
duke@1 371 _iter.reset_to_method(method());
duke@1 372 _flow = method()->get_flow_analysis();
duke@1 373 if (_flow->failing()) {
duke@1 374 C->record_method_not_compilable_all_tiers(_flow->failure_reason());
duke@1 375 }
duke@1 376
never@1399 377 #ifndef PRODUCT
never@1399 378 if (_flow->has_irreducible_entry()) {
never@1399 379 C->set_parsed_irreducible_loop(true);
never@1399 380 }
never@1399 381 #endif
never@1399 382
duke@1 383 if (_expected_uses <= 0) {
duke@1 384 _prof_factor = 1;
duke@1 385 } else {
duke@1 386 float prof_total = parse_method->interpreter_invocation_count();
duke@1 387 if (prof_total <= _expected_uses) {
duke@1 388 _prof_factor = 1;
duke@1 389 } else {
duke@1 390 _prof_factor = _expected_uses / prof_total;
duke@1 391 }
duke@1 392 }
duke@1 393
duke@1 394 CompileLog* log = C->log();
duke@1 395 if (log != NULL) {
duke@1 396 log->begin_head("parse method='%d' uses='%g'",
duke@1 397 log->identify(parse_method), expected_uses);
duke@1 398 if (depth() == 1 && C->is_osr_compilation()) {
duke@1 399 log->print(" osr_bci='%d'", C->entry_bci());
duke@1 400 }
duke@1 401 log->stamp();
duke@1 402 log->end_head();
duke@1 403 }
duke@1 404
duke@1 405 // Accumulate deoptimization counts.
duke@1 406 // (The range_check and store_check counts are checked elsewhere.)
duke@1 407 ciMethodData* md = method()->method_data();
duke@1 408 for (uint reason = 0; reason < md->trap_reason_limit(); reason++) {
duke@1 409 uint md_count = md->trap_count(reason);
duke@1 410 if (md_count != 0) {
duke@1 411 if (md_count == md->trap_count_limit())
duke@1 412 md_count += md->overflow_trap_count();
duke@1 413 uint total_count = C->trap_count(reason);
duke@1 414 uint old_count = total_count;
duke@1 415 total_count += md_count;
duke@1 416 // Saturate the add if it overflows.
duke@1 417 if (total_count < old_count || total_count < md_count)
duke@1 418 total_count = (uint)-1;
duke@1 419 C->set_trap_count(reason, total_count);
duke@1 420 if (log != NULL)
duke@1 421 log->elem("observe trap='%s' count='%d' total='%d'",
duke@1 422 Deoptimization::trap_reason_name(reason),
duke@1 423 md_count, total_count);
duke@1 424 }
duke@1 425 }
duke@1 426 // Accumulate total sum of decompilations, also.
duke@1 427 C->set_decompile_count(C->decompile_count() + md->decompile_count());
duke@1 428
duke@1 429 _count_invocations = C->do_count_invocations();
duke@1 430 _method_data_update = C->do_method_data_update();
duke@1 431
duke@1 432 if (log != NULL && method()->has_exception_handlers()) {
duke@1 433 log->elem("observe that='has_exception_handlers'");
duke@1 434 }
duke@1 435
duke@1 436 assert(method()->can_be_compiled(), "Can not parse this method, cutout earlier");
duke@1 437 assert(method()->has_balanced_monitors(), "Can not parse unbalanced monitors, cutout earlier");
duke@1 438
duke@1 439 // Always register dependence if JVMTI is enabled, because
duke@1 440 // either breakpoint setting or hotswapping of methods may
duke@1 441 // cause deoptimization.
kvn@2867 442 if (C->env()->jvmti_can_hotswap_or_post_breakpoint()) {
duke@1 443 C->dependencies()->assert_evol_method(method());
duke@1 444 }
duke@1 445
duke@1 446 methods_seen++;
duke@1 447
duke@1 448 // Do some special top-level things.
duke@1 449 if (depth() == 1 && C->is_osr_compilation()) {
duke@1 450 _entry_bci = C->entry_bci();
duke@1 451 _flow = method()->get_osr_flow_analysis(osr_bci());
duke@1 452 if (_flow->failing()) {
duke@1 453 C->record_method_not_compilable(_flow->failure_reason());
duke@1 454 #ifndef PRODUCT
duke@1 455 if (PrintOpto && (Verbose || WizardMode)) {
duke@1 456 tty->print_cr("OSR @%d type flow bailout: %s", _entry_bci, _flow->failure_reason());
duke@1 457 if (Verbose) {
duke@1 458 method()->print_oop();
duke@1 459 method()->print_codes();
duke@1 460 _flow->print();
duke@1 461 }
duke@1 462 }
duke@1 463 #endif
duke@1 464 }
duke@1 465 _tf = C->tf(); // the OSR entry type is different
duke@1 466 }
duke@1 467
duke@1 468 #ifdef ASSERT
duke@1 469 if (depth() == 1) {
duke@1 470 assert(C->is_osr_compilation() == this->is_osr_parse(), "OSR in sync");
duke@1 471 if (C->tf() != tf()) {
duke@1 472 MutexLockerEx ml(Compile_lock, Mutex::_no_safepoint_check_flag);
duke@1 473 assert(C->env()->system_dictionary_modification_counter_changed(),
duke@1 474 "Must invalidate if TypeFuncs differ");
duke@1 475 }
duke@1 476 } else {
duke@1 477 assert(!this->is_osr_parse(), "no recursive OSR");
duke@1 478 }
duke@1 479 #endif
duke@1 480
duke@1 481 methods_parsed++;
duke@1 482 #ifndef PRODUCT
duke@1 483 // add method size here to guarantee that inlined methods are added too
duke@1 484 if (TimeCompiler)
duke@1 485 _total_bytes_compiled += method()->code_size();
duke@1 486
duke@1 487 show_parse_info();
duke@1 488 #endif
duke@1 489
duke@1 490 if (failing()) {
duke@1 491 if (log) log->done("parse");
duke@1 492 return;
duke@1 493 }
duke@1 494
duke@1 495 gvn().set_type(root(), root()->bottom_type());
duke@1 496 gvn().transform(top());
duke@1 497
duke@1 498 // Import the results of the ciTypeFlow.
duke@1 499 init_blocks();
duke@1 500
duke@1 501 // Merge point for all normal exits
duke@1 502 build_exits();
duke@1 503
duke@1 504 // Setup the initial JVM state map.
duke@1 505 SafePointNode* entry_map = create_entry_map();
duke@1 506
duke@1 507 // Check for bailouts during map initialization
duke@1 508 if (failing() || entry_map == NULL) {
duke@1 509 if (log) log->done("parse");
duke@1 510 return;
duke@1 511 }
duke@1 512
duke@1 513 Node_Notes* caller_nn = C->default_node_notes();
duke@1 514 // Collect debug info for inlined calls unless -XX:-DebugInlinedCalls.
duke@1 515 if (DebugInlinedCalls || depth() == 1) {
duke@1 516 C->set_default_node_notes(make_node_notes(caller_nn));
duke@1 517 }
duke@1 518
duke@1 519 if (is_osr_parse()) {
duke@1 520 Node* osr_buf = entry_map->in(TypeFunc::Parms+0);
duke@1 521 entry_map->set_req(TypeFunc::Parms+0, top());
duke@1 522 set_map(entry_map);
duke@1 523 load_interpreter_state(osr_buf);
duke@1 524 } else {
duke@1 525 set_map(entry_map);
duke@1 526 do_method_entry();
duke@1 527 }
duke@1 528
duke@1 529 // Check for bailouts during method entry.
duke@1 530 if (failing()) {
duke@1 531 if (log) log->done("parse");
duke@1 532 C->set_default_node_notes(caller_nn);
duke@1 533 return;
duke@1 534 }
duke@1 535
duke@1 536 entry_map = map(); // capture any changes performed by method setup code
duke@1 537 assert(jvms()->endoff() == map()->req(), "map matches JVMS layout");
duke@1 538
duke@1 539 // We begin parsing as if we have just encountered a jump to the
duke@1 540 // method entry.
duke@1 541 Block* entry_block = start_block();
duke@1 542 assert(entry_block->start() == (is_osr_parse() ? osr_bci() : 0), "");
duke@1 543 set_map_clone(entry_map);
duke@1 544 merge_common(entry_block, entry_block->next_path_num());
duke@1 545
duke@1 546 #ifndef PRODUCT
duke@1 547 BytecodeParseHistogram *parse_histogram_obj = new (C->env()->arena()) BytecodeParseHistogram(this, C);
duke@1 548 set_parse_histogram( parse_histogram_obj );
duke@1 549 #endif
duke@1 550
duke@1 551 // Parse all the basic blocks.
duke@1 552 do_all_blocks();
duke@1 553
duke@1 554 C->set_default_node_notes(caller_nn);
duke@1 555
duke@1 556 // Check for bailouts during conversion to graph
duke@1 557 if (failing()) {
duke@1 558 if (log) log->done("parse");
duke@1 559 return;
duke@1 560 }
duke@1 561
duke@1 562 // Fix up all exiting control flow.
duke@1 563 set_map(entry_map);
duke@1 564 do_exits();
duke@1 565
duke@1 566 if (log) log->done("parse nodes='%d' memory='%d'",
duke@1 567 C->unique(), C->node_arena()->used());
duke@1 568 }
duke@1 569
duke@1 570 //---------------------------do_all_blocks-------------------------------------
duke@1 571 void Parse::do_all_blocks() {
never@1399 572 bool has_irreducible = flow()->has_irreducible_entry();
duke@1 573
never@1399 574 // Walk over all blocks in Reverse Post-Order.
never@1399 575 while (true) {
never@1399 576 bool progress = false;
never@1399 577 for (int rpo = 0; rpo < block_count(); rpo++) {
never@1399 578 Block* block = rpo_at(rpo);
duke@1 579
never@1399 580 if (block->is_parsed()) continue;
duke@1 581
never@1399 582 if (!block->is_merged()) {
never@1399 583 // Dead block, no state reaches this block
never@1399 584 continue;
never@1399 585 }
duke@1 586
never@1399 587 // Prepare to parse this block.
never@1399 588 load_state_from(block);
duke@1 589
never@1399 590 if (stopped()) {
never@1399 591 // Block is dead.
never@1399 592 continue;
duke@1 593 }
never@1399 594
never@1399 595 blocks_parsed++;
never@1399 596
never@1399 597 progress = true;
never@1399 598 if (block->is_loop_head() || block->is_handler() || has_irreducible && !block->is_ready()) {
never@1399 599 // Not all preds have been parsed. We must build phis everywhere.
never@1399 600 // (Note that dead locals do not get phis built, ever.)
never@1399 601 ensure_phis_everywhere();
never@1399 602
never@1399 603 // Leave behind an undisturbed copy of the map, for future merges.
never@1399 604 set_map(clone_map());
never@1399 605 }
never@1399 606
never@1399 607 if (control()->is_Region() && !block->is_loop_head() && !has_irreducible && !block->is_handler()) {
never@1399 608 // In the absence of irreducible loops, the Region and Phis
never@1399 609 // associated with a merge that doesn't involve a backedge can
twisti@2131 610 // be simplified now since the RPO parsing order guarantees
never@1399 611 // that any path which was supposed to reach here has already
never@1399 612 // been parsed or must be dead.
never@1399 613 Node* c = control();
never@1399 614 Node* result = _gvn.transform_no_reclaim(control());
never@1399 615 if (c != result && TraceOptoParse) {
never@1399 616 tty->print_cr("Block #%d replace %d with %d", block->rpo(), c->_idx, result->_idx);
never@1399 617 }
never@1399 618 if (result != top()) {
never@1399 619 record_for_igvn(result);
never@1399 620 }
never@1399 621 }
never@1399 622
never@1399 623 // Parse the block.
never@1399 624 do_one_block();
never@1399 625
never@1399 626 // Check for bailouts.
never@1399 627 if (failing()) return;
never@1399 628 }
never@1399 629
never@1399 630 // with irreducible loops multiple passes might be necessary to parse everything
never@1399 631 if (!has_irreducible || !progress) {
duke@1 632 break;
duke@1 633 }
never@1399 634 }
duke@1 635
never@1399 636 blocks_seen += block_count();
duke@1 637
duke@1 638 #ifndef PRODUCT
duke@1 639 // Make sure there are no half-processed blocks remaining.
duke@1 640 // Every remaining unprocessed block is dead and may be ignored now.
never@1399 641 for (int rpo = 0; rpo < block_count(); rpo++) {
never@1399 642 Block* block = rpo_at(rpo);
duke@1 643 if (!block->is_parsed()) {
duke@1 644 if (TraceOptoParse) {
never@1399 645 tty->print_cr("Skipped dead block %d at bci:%d", rpo, block->start());
duke@1 646 }
never@1399 647 assert(!block->is_merged(), "no half-processed blocks");
duke@1 648 }
duke@1 649 }
duke@1 650 #endif
duke@1 651 }
duke@1 652
duke@1 653 //-------------------------------build_exits----------------------------------
duke@1 654 // Build normal and exceptional exit merge points.
duke@1 655 void Parse::build_exits() {
duke@1 656 // make a clone of caller to prevent sharing of side-effects
duke@1 657 _exits.set_map(_exits.clone_map());
duke@1 658 _exits.clean_stack(_exits.sp());
duke@1 659 _exits.sync_jvms();
duke@1 660
duke@1 661 RegionNode* region = new (C, 1) RegionNode(1);
duke@1 662 record_for_igvn(region);
duke@1 663 gvn().set_type_bottom(region);
duke@1 664 _exits.set_control(region);
duke@1 665
duke@1 666 // Note: iophi and memphi are not transformed until do_exits.
duke@1 667 Node* iophi = new (C, region->req()) PhiNode(region, Type::ABIO);
duke@1 668 Node* memphi = new (C, region->req()) PhiNode(region, Type::MEMORY, TypePtr::BOTTOM);
duke@1 669 _exits.set_i_o(iophi);
duke@1 670 _exits.set_all_memory(memphi);
duke@1 671
duke@1 672 // Add a return value to the exit state. (Do not push it yet.)
duke@1 673 if (tf()->range()->cnt() > TypeFunc::Parms) {
duke@1 674 const Type* ret_type = tf()->range()->field_at(TypeFunc::Parms);
duke@1 675 // Don't "bind" an unloaded return klass to the ret_phi. If the klass
duke@1 676 // becomes loaded during the subsequent parsing, the loaded and unloaded
duke@1 677 // types will not join when we transform and push in do_exits().
duke@1 678 const TypeOopPtr* ret_oop_type = ret_type->isa_oopptr();
duke@1 679 if (ret_oop_type && !ret_oop_type->klass()->is_loaded()) {
duke@1 680 ret_type = TypeOopPtr::BOTTOM;
duke@1 681 }
duke@1 682 int ret_size = type2size[ret_type->basic_type()];
duke@1 683 Node* ret_phi = new (C, region->req()) PhiNode(region, ret_type);
duke@1 684 _exits.ensure_stack(ret_size);
duke@1 685 assert((int)(tf()->range()->cnt() - TypeFunc::Parms) == ret_size, "good tf range");
duke@1 686 assert(method()->return_type()->size() == ret_size, "tf agrees w/ method");
duke@1 687 _exits.set_argument(0, ret_phi); // here is where the parser finds it
duke@1 688 // Note: ret_phi is not yet pushed, until do_exits.
duke@1 689 }
duke@1 690 }
duke@1 691
duke@1 692
duke@1 693 //----------------------------build_start_state-------------------------------
duke@1 694 // Construct a state which contains only the incoming arguments from an
duke@1 695 // unknown caller. The method & bci will be NULL & InvocationEntryBci.
duke@1 696 JVMState* Compile::build_start_state(StartNode* start, const TypeFunc* tf) {
duke@1 697 int arg_size = tf->domain()->cnt();
duke@1 698 int max_size = MAX2(arg_size, (int)tf->range()->cnt());
duke@1 699 JVMState* jvms = new (this) JVMState(max_size - TypeFunc::Parms);
duke@1 700 SafePointNode* map = new (this, max_size) SafePointNode(max_size, NULL);
duke@1 701 record_for_igvn(map);
duke@1 702 assert(arg_size == TypeFunc::Parms + (is_osr_compilation() ? 1 : method()->arg_size()), "correct arg_size");
duke@1 703 Node_Notes* old_nn = default_node_notes();
duke@1 704 if (old_nn != NULL && has_method()) {
duke@1 705 Node_Notes* entry_nn = old_nn->clone(this);
duke@1 706 JVMState* entry_jvms = new(this) JVMState(method(), old_nn->jvms());
duke@1 707 entry_jvms->set_offsets(0);
duke@1 708 entry_jvms->set_bci(entry_bci());
duke@1 709 entry_nn->set_jvms(entry_jvms);
duke@1 710 set_default_node_notes(entry_nn);
duke@1 711 }
duke@1 712 uint i;
duke@1 713 for (i = 0; i < (uint)arg_size; i++) {
duke@1 714 Node* parm = initial_gvn()->transform(new (this, 1) ParmNode(start, i));
duke@1 715 map->init_req(i, parm);
duke@1 716 // Record all these guys for later GVN.
duke@1 717 record_for_igvn(parm);
duke@1 718 }
duke@1 719 for (; i < map->req(); i++) {
duke@1 720 map->init_req(i, top());
duke@1 721 }
duke@1 722 assert(jvms->argoff() == TypeFunc::Parms, "parser gets arguments here");
duke@1 723 set_default_node_notes(old_nn);
duke@1 724 map->set_jvms(jvms);
duke@1 725 jvms->set_map(map);
duke@1 726 return jvms;
duke@1 727 }
duke@1 728
duke@1 729 //-----------------------------make_node_notes---------------------------------
duke@1 730 Node_Notes* Parse::make_node_notes(Node_Notes* caller_nn) {
duke@1 731 if (caller_nn == NULL) return NULL;
duke@1 732 Node_Notes* nn = caller_nn->clone(C);
duke@1 733 JVMState* caller_jvms = nn->jvms();
duke@1 734 JVMState* jvms = new (C) JVMState(method(), caller_jvms);
duke@1 735 jvms->set_offsets(0);
duke@1 736 jvms->set_bci(_entry_bci);
duke@1 737 nn->set_jvms(jvms);
duke@1 738 return nn;
duke@1 739 }
duke@1 740
duke@1 741
duke@1 742 //--------------------------return_values--------------------------------------
duke@1 743 void Compile::return_values(JVMState* jvms) {
duke@1 744 GraphKit kit(jvms);
duke@1 745 Node* ret = new (this, TypeFunc::Parms) ReturnNode(TypeFunc::Parms,
duke@1 746 kit.control(),
duke@1 747 kit.i_o(),
duke@1 748 kit.reset_memory(),
duke@1 749 kit.frameptr(),
duke@1 750 kit.returnadr());
duke@1 751 // Add zero or 1 return values
duke@1 752 int ret_size = tf()->range()->cnt() - TypeFunc::Parms;
duke@1 753 if (ret_size > 0) {
duke@1 754 kit.inc_sp(-ret_size); // pop the return value(s)
duke@1 755 kit.sync_jvms();
duke@1 756 ret->add_req(kit.argument(0));
duke@1 757 // Note: The second dummy edge is not needed by a ReturnNode.
duke@1 758 }
duke@1 759 // bind it to root
duke@1 760 root()->add_req(ret);
duke@1 761 record_for_igvn(ret);
duke@1 762 initial_gvn()->transform_no_reclaim(ret);
duke@1 763 }
duke@1 764
duke@1 765 //------------------------rethrow_exceptions-----------------------------------
duke@1 766 // Bind all exception states in the list into a single RethrowNode.
duke@1 767 void Compile::rethrow_exceptions(JVMState* jvms) {
duke@1 768 GraphKit kit(jvms);
duke@1 769 if (!kit.has_exceptions()) return; // nothing to generate
duke@1 770 // Load my combined exception state into the kit, with all phis transformed:
duke@1 771 SafePointNode* ex_map = kit.combine_and_pop_all_exception_states();
duke@1 772 Node* ex_oop = kit.use_exception_state(ex_map);
duke@1 773 RethrowNode* exit = new (this, TypeFunc::Parms + 1) RethrowNode(kit.control(),
duke@1 774 kit.i_o(), kit.reset_memory(),
duke@1 775 kit.frameptr(), kit.returnadr(),
duke@1 776 // like a return but with exception input
duke@1 777 ex_oop);
duke@1 778 // bind to root
duke@1 779 root()->add_req(exit);
duke@1 780 record_for_igvn(exit);
duke@1 781 initial_gvn()->transform_no_reclaim(exit);
duke@1 782 }
duke@1 783
duke@1 784 bool Parse::can_rerun_bytecode() {
duke@1 785 switch (bc()) {
duke@1 786 case Bytecodes::_ldc:
duke@1 787 case Bytecodes::_ldc_w:
duke@1 788 case Bytecodes::_ldc2_w:
duke@1 789 case Bytecodes::_getfield:
duke@1 790 case Bytecodes::_putfield:
duke@1 791 case Bytecodes::_getstatic:
duke@1 792 case Bytecodes::_putstatic:
duke@1 793 case Bytecodes::_arraylength:
duke@1 794 case Bytecodes::_baload:
duke@1 795 case Bytecodes::_caload:
duke@1 796 case Bytecodes::_iaload:
duke@1 797 case Bytecodes::_saload:
duke@1 798 case Bytecodes::_faload:
duke@1 799 case Bytecodes::_aaload:
duke@1 800 case Bytecodes::_laload:
duke@1 801 case Bytecodes::_daload:
duke@1 802 case Bytecodes::_bastore:
duke@1 803 case Bytecodes::_castore:
duke@1 804 case Bytecodes::_iastore:
duke@1 805 case Bytecodes::_sastore:
duke@1 806 case Bytecodes::_fastore:
duke@1 807 case Bytecodes::_aastore:
duke@1 808 case Bytecodes::_lastore:
duke@1 809 case Bytecodes::_dastore:
duke@1 810 case Bytecodes::_irem:
duke@1 811 case Bytecodes::_idiv:
duke@1 812 case Bytecodes::_lrem:
duke@1 813 case Bytecodes::_ldiv:
duke@1 814 case Bytecodes::_frem:
duke@1 815 case Bytecodes::_fdiv:
duke@1 816 case Bytecodes::_drem:
duke@1 817 case Bytecodes::_ddiv:
duke@1 818 case Bytecodes::_checkcast:
duke@1 819 case Bytecodes::_instanceof:
duke@1 820 case Bytecodes::_athrow:
duke@1 821 case Bytecodes::_anewarray:
duke@1 822 case Bytecodes::_newarray:
duke@1 823 case Bytecodes::_multianewarray:
duke@1 824 case Bytecodes::_new:
duke@1 825 case Bytecodes::_monitorenter: // can re-run initial null check, only
duke@1 826 case Bytecodes::_return:
duke@1 827 return true;
duke@1 828 break;
duke@1 829
duke@1 830 case Bytecodes::_invokestatic:
jrose@2570 831 case Bytecodes::_invokedynamic:
duke@1 832 case Bytecodes::_invokespecial:
duke@1 833 case Bytecodes::_invokevirtual:
duke@1 834 case Bytecodes::_invokeinterface:
duke@1 835 return false;
duke@1 836 break;
duke@1 837
duke@1 838 default:
duke@1 839 assert(false, "unexpected bytecode produced an exception");
duke@1 840 return true;
duke@1 841 }
duke@1 842 }
duke@1 843
duke@1 844 //---------------------------do_exceptions-------------------------------------
duke@1 845 // Process exceptions arising from the current bytecode.
duke@1 846 // Send caught exceptions to the proper handler within this method.
duke@1 847 // Unhandled exceptions feed into _exit.
duke@1 848 void Parse::do_exceptions() {
duke@1 849 if (!has_exceptions()) return;
duke@1 850
duke@1 851 if (failing()) {
duke@1 852 // Pop them all off and throw them away.
duke@1 853 while (pop_exception_state() != NULL) ;
duke@1 854 return;
duke@1 855 }
duke@1 856
duke@1 857 // Make sure we can classify this bytecode if we need to.
duke@1 858 debug_only(can_rerun_bytecode());
duke@1 859
duke@1 860 PreserveJVMState pjvms(this, false);
duke@1 861
duke@1 862 SafePointNode* ex_map;
duke@1 863 while ((ex_map = pop_exception_state()) != NULL) {
duke@1 864 if (!method()->has_exception_handlers()) {
duke@1 865 // Common case: Transfer control outward.
duke@1 866 // Doing it this early allows the exceptions to common up
duke@1 867 // even between adjacent method calls.
duke@1 868 throw_to_exit(ex_map);
duke@1 869 } else {
duke@1 870 // Have to look at the exception first.
duke@1 871 assert(stopped(), "catch_inline_exceptions trashes the map");
duke@1 872 catch_inline_exceptions(ex_map);
duke@1 873 stop_and_kill_map(); // we used up this exception state; kill it
duke@1 874 }
duke@1 875 }
duke@1 876
duke@1 877 // We now return to our regularly scheduled program:
duke@1 878 }
duke@1 879
duke@1 880 //---------------------------throw_to_exit-------------------------------------
duke@1 881 // Merge the given map into an exception exit from this method.
duke@1 882 // The exception exit will handle any unlocking of receiver.
duke@1 883 // The ex_oop must be saved within the ex_map, unlike merge_exception.
duke@1 884 void Parse::throw_to_exit(SafePointNode* ex_map) {
duke@1 885 // Pop the JVMS to (a copy of) the caller.
duke@1 886 GraphKit caller;
duke@1 887 caller.set_map_clone(_caller->map());
duke@1 888 caller.set_bci(_caller->bci());
duke@1 889 caller.set_sp(_caller->sp());
duke@1 890 // Copy out the standard machine state:
duke@1 891 for (uint i = 0; i < TypeFunc::Parms; i++) {
duke@1 892 caller.map()->set_req(i, ex_map->in(i));
duke@1 893 }
duke@1 894 // ...and the exception:
duke@1 895 Node* ex_oop = saved_ex_oop(ex_map);
duke@1 896 SafePointNode* caller_ex_map = caller.make_exception_state(ex_oop);
duke@1 897 // Finally, collect the new exception state in my exits:
duke@1 898 _exits.add_exception_state(caller_ex_map);
duke@1 899 }
duke@1 900
duke@1 901 //------------------------------do_exits---------------------------------------
duke@1 902 void Parse::do_exits() {
duke@1 903 set_parse_bci(InvocationEntryBci);
duke@1 904
duke@1 905 // Now peephole on the return bits
duke@1 906 Node* region = _exits.control();
duke@1 907 _exits.set_control(gvn().transform(region));
duke@1 908
duke@1 909 Node* iophi = _exits.i_o();
duke@1 910 _exits.set_i_o(gvn().transform(iophi));
duke@1 911
duke@1 912 if (wrote_final()) {
duke@1 913 // This method (which must be a constructor by the rules of Java)
duke@1 914 // wrote a final. The effects of all initializations must be
duke@1 915 // committed to memory before any code after the constructor
duke@1 916 // publishes the reference to the newly constructor object.
duke@1 917 // Rather than wait for the publication, we simply block the
duke@1 918 // writes here. Rather than put a barrier on only those writes
duke@1 919 // which are required to complete, we force all writes to complete.
duke@1 920 //
duke@1 921 // "All bets are off" unless the first publication occurs after a
duke@1 922 // normal return from the constructor. We do not attempt to detect
duke@1 923 // such unusual early publications. But no barrier is needed on
duke@1 924 // exceptional returns, since they cannot publish normally.
duke@1 925 //
duke@1 926 _exits.insert_mem_bar(Op_MemBarRelease);
duke@1 927 #ifndef PRODUCT
duke@1 928 if (PrintOpto && (Verbose || WizardMode)) {
duke@1 929 method()->print_name();
duke@1 930 tty->print_cr(" writes finals and needs a memory barrier");
duke@1 931 }
duke@1 932 #endif
duke@1 933 }
duke@1 934
duke@1 935 for (MergeMemStream mms(_exits.merged_memory()); mms.next_non_empty(); ) {
duke@1 936 // transform each slice of the original memphi:
duke@1 937 mms.set_memory(_gvn.transform(mms.memory()));
duke@1 938 }
duke@1 939
duke@1 940 if (tf()->range()->cnt() > TypeFunc::Parms) {
duke@1 941 const Type* ret_type = tf()->range()->field_at(TypeFunc::Parms);
duke@1 942 Node* ret_phi = _gvn.transform( _exits.argument(0) );
duke@1 943 assert(_exits.control()->is_top() || !_gvn.type(ret_phi)->empty(), "return value must be well defined");
duke@1 944 _exits.push_node(ret_type->basic_type(), ret_phi);
duke@1 945 }
duke@1 946
duke@1 947 // Note: Logic for creating and optimizing the ReturnNode is in Compile.
duke@1 948
duke@1 949 // Unlock along the exceptional paths.
duke@1 950 // This is done late so that we can common up equivalent exceptions
duke@1 951 // (e.g., null checks) arising from multiple points within this method.
duke@1 952 // See GraphKit::add_exception_state, which performs the commoning.
duke@1 953 bool do_synch = method()->is_synchronized() && GenerateSynchronizationCode;
duke@1 954
duke@1 955 // record exit from a method if compiled while Dtrace is turned on.
kvn@2867 956 if (do_synch || C->env()->dtrace_method_probes()) {
duke@1 957 // First move the exception list out of _exits:
duke@1 958 GraphKit kit(_exits.transfer_exceptions_into_jvms());
duke@1 959 SafePointNode* normal_map = kit.map(); // keep this guy safe
duke@1 960 // Now re-collect the exceptions into _exits:
duke@1 961 SafePointNode* ex_map;
duke@1 962 while ((ex_map = kit.pop_exception_state()) != NULL) {
duke@1 963 Node* ex_oop = kit.use_exception_state(ex_map);
duke@1 964 // Force the exiting JVM state to have this method at InvocationEntryBci.
duke@1 965 // The exiting JVM state is otherwise a copy of the calling JVMS.
duke@1 966 JVMState* caller = kit.jvms();
duke@1 967 JVMState* ex_jvms = caller->clone_shallow(C);
duke@1 968 ex_jvms->set_map(kit.clone_map());
duke@1 969 ex_jvms->map()->set_jvms(ex_jvms);
duke@1 970 ex_jvms->set_bci( InvocationEntryBci);
duke@1 971 kit.set_jvms(ex_jvms);
duke@1 972 if (do_synch) {
duke@1 973 // Add on the synchronized-method box/object combo
duke@1 974 kit.map()->push_monitor(_synch_lock);
duke@1 975 // Unlock!
duke@1 976 kit.shared_unlock(_synch_lock->box_node(), _synch_lock->obj_node());
duke@1 977 }
kvn@2867 978 if (C->env()->dtrace_method_probes()) {
duke@1 979 kit.make_dtrace_method_exit(method());
duke@1 980 }
duke@1 981 // Done with exception-path processing.
duke@1 982 ex_map = kit.make_exception_state(ex_oop);
duke@1 983 assert(ex_jvms->same_calls_as(ex_map->jvms()), "sanity");
duke@1 984 // Pop the last vestige of this method:
duke@1 985 ex_map->set_jvms(caller->clone_shallow(C));
duke@1 986 ex_map->jvms()->set_map(ex_map);
duke@1 987 _exits.push_exception_state(ex_map);
duke@1 988 }
duke@1 989 assert(_exits.map() == normal_map, "keep the same return state");
duke@1 990 }
duke@1 991
duke@1 992 {
duke@1 993 // Capture very early exceptions (receiver null checks) from caller JVMS
duke@1 994 GraphKit caller(_caller);
duke@1 995 SafePointNode* ex_map;
duke@1 996 while ((ex_map = caller.pop_exception_state()) != NULL) {
duke@1 997 _exits.add_exception_state(ex_map);
duke@1 998 }
duke@1 999 }
duke@1 1000 }
duke@1 1001
duke@1 1002 //-----------------------------create_entry_map-------------------------------
duke@1 1003 // Initialize our parser map to contain the types at method entry.
duke@1 1004 // For OSR, the map contains a single RawPtr parameter.
duke@1 1005 // Initial monitor locking for sync. methods is performed by do_method_entry.
duke@1 1006 SafePointNode* Parse::create_entry_map() {
duke@1 1007 // Check for really stupid bail-out cases.
duke@1 1008 uint len = TypeFunc::Parms + method()->max_locals() + method()->max_stack();
duke@1 1009 if (len >= 32760) {
duke@1 1010 C->record_method_not_compilable_all_tiers("too many local variables");
duke@1 1011 return NULL;
duke@1 1012 }
duke@1 1013
duke@1 1014 // If this is an inlined method, we may have to do a receiver null check.
duke@1 1015 if (_caller->has_method() && is_normal_parse() && !method()->is_static()) {
duke@1 1016 GraphKit kit(_caller);
duke@1 1017 kit.null_check_receiver(method());
duke@1 1018 _caller = kit.transfer_exceptions_into_jvms();
duke@1 1019 if (kit.stopped()) {
duke@1 1020 _exits.add_exception_states_from(_caller);
duke@1 1021 _exits.set_jvms(_caller);
duke@1 1022 return NULL;
duke@1 1023 }
duke@1 1024 }
duke@1 1025
duke@1 1026 assert(method() != NULL, "parser must have a method");
duke@1 1027
duke@1 1028 // Create an initial safepoint to hold JVM state during parsing
duke@1 1029 JVMState* jvms = new (C) JVMState(method(), _caller->has_method() ? _caller : NULL);
duke@1 1030 set_map(new (C, len) SafePointNode(len, jvms));
duke@1 1031 jvms->set_map(map());
duke@1 1032 record_for_igvn(map());
duke@1 1033 assert(jvms->endoff() == len, "correct jvms sizing");
duke@1 1034
duke@1 1035 SafePointNode* inmap = _caller->map();
duke@1 1036 assert(inmap != NULL, "must have inmap");
duke@1 1037
duke@1 1038 uint i;
duke@1 1039
duke@1 1040 // Pass thru the predefined input parameters.
duke@1 1041 for (i = 0; i < TypeFunc::Parms; i++) {
duke@1 1042 map()->init_req(i, inmap->in(i));
duke@1 1043 }
duke@1 1044
duke@1 1045 if (depth() == 1) {
duke@1 1046 assert(map()->memory()->Opcode() == Op_Parm, "");
duke@1 1047 // Insert the memory aliasing node
duke@1 1048 set_all_memory(reset_memory());
duke@1 1049 }
duke@1 1050 assert(merged_memory(), "");
duke@1 1051
duke@1 1052 // Now add the locals which are initially bound to arguments:
duke@1 1053 uint arg_size = tf()->domain()->cnt();
duke@1 1054 ensure_stack(arg_size - TypeFunc::Parms); // OSR methods have funny args
duke@1 1055 for (i = TypeFunc::Parms; i < arg_size; i++) {
duke@1 1056 map()->init_req(i, inmap->argument(_caller, i - TypeFunc::Parms));
duke@1 1057 }
duke@1 1058
duke@1 1059 // Clear out the rest of the map (locals and stack)
duke@1 1060 for (i = arg_size; i < len; i++) {
duke@1 1061 map()->init_req(i, top());
duke@1 1062 }
duke@1 1063
duke@1 1064 SafePointNode* entry_map = stop();
duke@1 1065 return entry_map;
duke@1 1066 }
duke@1 1067
duke@1 1068 //-----------------------------do_method_entry--------------------------------
duke@1 1069 // Emit any code needed in the pseudo-block before BCI zero.
duke@1 1070 // The main thing to do is lock the receiver of a synchronized method.
duke@1 1071 void Parse::do_method_entry() {
duke@1 1072 set_parse_bci(InvocationEntryBci); // Pseudo-BCP
duke@1 1073 set_sp(0); // Java Stack Pointer
duke@1 1074
duke@1 1075 NOT_PRODUCT( count_compiled_calls(true/*at_method_entry*/, false/*is_inline*/); )
duke@1 1076
kvn@2867 1077 if (C->env()->dtrace_method_probes()) {
duke@1 1078 make_dtrace_method_entry(method());
duke@1 1079 }
duke@1 1080
duke@1 1081 // If the method is synchronized, we need to construct a lock node, attach
duke@1 1082 // it to the Start node, and pin it there.
duke@1 1083 if (method()->is_synchronized()) {
duke@1 1084 // Insert a FastLockNode right after the Start which takes as arguments
duke@1 1085 // the current thread pointer, the "this" pointer & the address of the
duke@1 1086 // stack slot pair used for the lock. The "this" pointer is a projection
duke@1 1087 // off the start node, but the locking spot has to be constructed by
duke@1 1088 // creating a ConLNode of 0, and boxing it with a BoxLockNode. The BoxLockNode
duke@1 1089 // becomes the second argument to the FastLockNode call. The
duke@1 1090 // FastLockNode becomes the new control parent to pin it to the start.
duke@1 1091
duke@1 1092 // Setup Object Pointer
duke@1 1093 Node *lock_obj = NULL;
duke@1 1094 if(method()->is_static()) {
duke@1 1095 ciInstance* mirror = _method->holder()->java_mirror();
duke@1 1096 const TypeInstPtr *t_lock = TypeInstPtr::make(mirror);
duke@1 1097 lock_obj = makecon(t_lock);
duke@1 1098 } else { // Else pass the "this" pointer,
duke@1 1099 lock_obj = local(0); // which is Parm0 from StartNode
duke@1 1100 }
duke@1 1101 // Clear out dead values from the debug info.
duke@1 1102 kill_dead_locals();
duke@1 1103 // Build the FastLockNode
duke@1 1104 _synch_lock = shared_lock(lock_obj);
duke@1 1105 }
duke@1 1106
duke@1 1107 if (depth() == 1) {
duke@1 1108 increment_and_test_invocation_counter(Tier2CompileThreshold);
duke@1 1109 }
duke@1 1110 }
duke@1 1111
duke@1 1112 //------------------------------init_blocks------------------------------------
duke@1 1113 // Initialize our parser map to contain the types/monitors at method entry.
duke@1 1114 void Parse::init_blocks() {
duke@1 1115 // Create the blocks.
duke@1 1116 _block_count = flow()->block_count();
duke@1 1117 _blocks = NEW_RESOURCE_ARRAY(Block, _block_count);
duke@1 1118 Copy::zero_to_bytes(_blocks, sizeof(Block)*_block_count);
duke@1 1119
never@1399 1120 int rpo;
duke@1 1121
duke@1 1122 // Initialize the structs.
never@1399 1123 for (rpo = 0; rpo < block_count(); rpo++) {
never@1399 1124 Block* block = rpo_at(rpo);
never@1399 1125 block->init_node(this, rpo);
duke@1 1126 }
duke@1 1127
duke@1 1128 // Collect predecessor and successor information.
never@1399 1129 for (rpo = 0; rpo < block_count(); rpo++) {
never@1399 1130 Block* block = rpo_at(rpo);
duke@1 1131 block->init_graph(this);
duke@1 1132 }
duke@1 1133 }
duke@1 1134
duke@1 1135 //-------------------------------init_node-------------------------------------
never@1399 1136 void Parse::Block::init_node(Parse* outer, int rpo) {
never@1399 1137 _flow = outer->flow()->rpo_at(rpo);
duke@1 1138 _pred_count = 0;
duke@1 1139 _preds_parsed = 0;
duke@1 1140 _count = 0;
duke@1 1141 assert(pred_count() == 0 && preds_parsed() == 0, "sanity");
duke@1 1142 assert(!(is_merged() || is_parsed() || is_handler()), "sanity");
duke@1 1143 assert(_live_locals.size() == 0, "sanity");
duke@1 1144
duke@1 1145 // entry point has additional predecessor
duke@1 1146 if (flow()->is_start()) _pred_count++;
duke@1 1147 assert(flow()->is_start() == (this == outer->start_block()), "");
duke@1 1148 }
duke@1 1149
duke@1 1150 //-------------------------------init_graph------------------------------------
duke@1 1151 void Parse::Block::init_graph(Parse* outer) {
duke@1 1152 // Create the successor list for this parser block.
duke@1 1153 GrowableArray<ciTypeFlow::Block*>* tfs = flow()->successors();
duke@1 1154 GrowableArray<ciTypeFlow::Block*>* tfe = flow()->exceptions();
duke@1 1155 int ns = tfs->length();
duke@1 1156 int ne = tfe->length();
duke@1 1157 _num_successors = ns;
duke@1 1158 _all_successors = ns+ne;
duke@1 1159 _successors = (ns+ne == 0) ? NULL : NEW_RESOURCE_ARRAY(Block*, ns+ne);
duke@1 1160 int p = 0;
duke@1 1161 for (int i = 0; i < ns+ne; i++) {
duke@1 1162 ciTypeFlow::Block* tf2 = (i < ns) ? tfs->at(i) : tfe->at(i-ns);
never@1399 1163 Block* block2 = outer->rpo_at(tf2->rpo());
duke@1 1164 _successors[i] = block2;
duke@1 1165
duke@1 1166 // Accumulate pred info for the other block, too.
duke@1 1167 if (i < ns) {
duke@1 1168 block2->_pred_count++;
duke@1 1169 } else {
duke@1 1170 block2->_is_handler = true;
duke@1 1171 }
duke@1 1172
duke@1 1173 #ifdef ASSERT
duke@1 1174 // A block's successors must be distinguishable by BCI.
duke@1 1175 // That is, no bytecode is allowed to branch to two different
duke@1 1176 // clones of the same code location.
duke@1 1177 for (int j = 0; j < i; j++) {
duke@1 1178 Block* block1 = _successors[j];
duke@1 1179 if (block1 == block2) continue; // duplicates are OK
duke@1 1180 assert(block1->start() != block2->start(), "successors have unique bcis");
duke@1 1181 }
duke@1 1182 #endif
duke@1 1183 }
duke@1 1184
duke@1 1185 // Note: We never call next_path_num along exception paths, so they
duke@1 1186 // never get processed as "ready". Also, the input phis of exception
duke@1 1187 // handlers get specially processed, so that
duke@1 1188 }
duke@1 1189
duke@1 1190 //---------------------------successor_for_bci---------------------------------
duke@1 1191 Parse::Block* Parse::Block::successor_for_bci(int bci) {
duke@1 1192 for (int i = 0; i < all_successors(); i++) {
duke@1 1193 Block* block2 = successor_at(i);
duke@1 1194 if (block2->start() == bci) return block2;
duke@1 1195 }
duke@1 1196 // We can actually reach here if ciTypeFlow traps out a block
duke@1 1197 // due to an unloaded class, and concurrently with compilation the
duke@1 1198 // class is then loaded, so that a later phase of the parser is
duke@1 1199 // able to see more of the bytecode CFG. Or, the flow pass and
duke@1 1200 // the parser can have a minor difference of opinion about executability
duke@1 1201 // of bytecodes. For example, "obj.field = null" is executable even
duke@1 1202 // if the field's type is an unloaded class; the flow pass used to
duke@1 1203 // make a trap for such code.
duke@1 1204 return NULL;
duke@1 1205 }
duke@1 1206
duke@1 1207
duke@1 1208 //-----------------------------stack_type_at-----------------------------------
duke@1 1209 const Type* Parse::Block::stack_type_at(int i) const {
duke@1 1210 return get_type(flow()->stack_type_at(i));
duke@1 1211 }
duke@1 1212
duke@1 1213
duke@1 1214 //-----------------------------local_type_at-----------------------------------
duke@1 1215 const Type* Parse::Block::local_type_at(int i) const {
duke@1 1216 // Make dead locals fall to bottom.
duke@1 1217 if (_live_locals.size() == 0) {
duke@1 1218 MethodLivenessResult live_locals = flow()->outer()->method()->liveness_at_bci(start());
duke@1 1219 // This bitmap can be zero length if we saw a breakpoint.
duke@1 1220 // In such cases, pretend they are all live.
duke@1 1221 ((Block*)this)->_live_locals = live_locals;
duke@1 1222 }
duke@1 1223 if (_live_locals.size() > 0 && !_live_locals.at(i))
duke@1 1224 return Type::BOTTOM;
duke@1 1225
duke@1 1226 return get_type(flow()->local_type_at(i));
duke@1 1227 }
duke@1 1228
duke@1 1229
duke@1 1230 #ifndef PRODUCT
duke@1 1231
duke@1 1232 //----------------------------name_for_bc--------------------------------------
duke@1 1233 // helper method for BytecodeParseHistogram
duke@1 1234 static const char* name_for_bc(int i) {
duke@1 1235 return Bytecodes::is_defined(i) ? Bytecodes::name(Bytecodes::cast(i)) : "xxxunusedxxx";
duke@1 1236 }
duke@1 1237
duke@1 1238 //----------------------------BytecodeParseHistogram------------------------------------
duke@1 1239 Parse::BytecodeParseHistogram::BytecodeParseHistogram(Parse *p, Compile *c) {
duke@1 1240 _parser = p;
duke@1 1241 _compiler = c;
duke@1 1242 if( ! _initialized ) { _initialized = true; reset(); }
duke@1 1243 }
duke@1 1244
duke@1 1245 //----------------------------current_count------------------------------------
duke@1 1246 int Parse::BytecodeParseHistogram::current_count(BPHType bph_type) {
duke@1 1247 switch( bph_type ) {
duke@1 1248 case BPH_transforms: { return _parser->gvn().made_progress(); }
duke@1 1249 case BPH_values: { return _parser->gvn().made_new_values(); }
duke@1 1250 default: { ShouldNotReachHere(); return 0; }
duke@1 1251 }
duke@1 1252 }
duke@1 1253
duke@1 1254 //----------------------------initialized--------------------------------------
duke@1 1255 bool Parse::BytecodeParseHistogram::initialized() { return _initialized; }
duke@1 1256
duke@1 1257 //----------------------------reset--------------------------------------------
duke@1 1258 void Parse::BytecodeParseHistogram::reset() {
duke@1 1259 int i = Bytecodes::number_of_codes;
duke@1 1260 while (i-- > 0) { _bytecodes_parsed[i] = 0; _nodes_constructed[i] = 0; _nodes_transformed[i] = 0; _new_values[i] = 0; }
duke@1 1261 }
duke@1 1262
duke@1 1263 //----------------------------set_initial_state--------------------------------
duke@1 1264 // Record info when starting to parse one bytecode
duke@1 1265 void Parse::BytecodeParseHistogram::set_initial_state( Bytecodes::Code bc ) {
duke@1 1266 if( PrintParseStatistics && !_parser->is_osr_parse() ) {
duke@1 1267 _initial_bytecode = bc;
duke@1 1268 _initial_node_count = _compiler->unique();
duke@1 1269 _initial_transforms = current_count(BPH_transforms);
duke@1 1270 _initial_values = current_count(BPH_values);
duke@1 1271 }
duke@1 1272 }
duke@1 1273
duke@1 1274 //----------------------------record_change--------------------------------
duke@1 1275 // Record results of parsing one bytecode
duke@1 1276 void Parse::BytecodeParseHistogram::record_change() {
duke@1 1277 if( PrintParseStatistics && !_parser->is_osr_parse() ) {
duke@1 1278 ++_bytecodes_parsed[_initial_bytecode];
duke@1 1279 _nodes_constructed [_initial_bytecode] += (_compiler->unique() - _initial_node_count);
duke@1 1280 _nodes_transformed [_initial_bytecode] += (current_count(BPH_transforms) - _initial_transforms);
duke@1 1281 _new_values [_initial_bytecode] += (current_count(BPH_values) - _initial_values);
duke@1 1282 }
duke@1 1283 }
duke@1 1284
duke@1 1285
duke@1 1286 //----------------------------print--------------------------------------------
duke@1 1287 void Parse::BytecodeParseHistogram::print(float cutoff) {
duke@1 1288 ResourceMark rm;
duke@1 1289 // print profile
duke@1 1290 int total = 0;
duke@1 1291 int i = 0;
duke@1 1292 for( i = 0; i < Bytecodes::number_of_codes; ++i ) { total += _bytecodes_parsed[i]; }
duke@1 1293 int abs_sum = 0;
duke@1 1294 tty->cr(); //0123456789012345678901234567890123456789012345678901234567890123456789
duke@1 1295 tty->print_cr("Histogram of %d parsed bytecodes:", total);
duke@1 1296 if( total == 0 ) { return; }
duke@1 1297 tty->cr();
duke@1 1298 tty->print_cr("absolute: count of compiled bytecodes of this type");
duke@1 1299 tty->print_cr("relative: percentage contribution to compiled nodes");
duke@1 1300 tty->print_cr("nodes : Average number of nodes constructed per bytecode");
duke@1 1301 tty->print_cr("rnodes : Significance towards total nodes constructed, (nodes*relative)");
duke@1 1302 tty->print_cr("transforms: Average amount of tranform progress per bytecode compiled");
duke@1 1303 tty->print_cr("values : Average number of node values improved per bytecode");
duke@1 1304 tty->print_cr("name : Bytecode name");
duke@1 1305 tty->cr();
duke@1 1306 tty->print_cr(" absolute relative nodes rnodes transforms values name");
duke@1 1307 tty->print_cr("----------------------------------------------------------------------");
duke@1 1308 while (--i > 0) {
duke@1 1309 int abs = _bytecodes_parsed[i];
duke@1 1310 float rel = abs * 100.0F / total;
duke@1 1311 float nodes = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _nodes_constructed[i])/_bytecodes_parsed[i];
duke@1 1312 float rnodes = _bytecodes_parsed[i] == 0 ? 0 : rel * nodes;
duke@1 1313 float xforms = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _nodes_transformed[i])/_bytecodes_parsed[i];
duke@1 1314 float values = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _new_values [i])/_bytecodes_parsed[i];
duke@1 1315 if (cutoff <= rel) {
duke@1 1316 tty->print_cr("%10d %7.2f%% %6.1f %6.2f %6.1f %6.1f %s", abs, rel, nodes, rnodes, xforms, values, name_for_bc(i));
duke@1 1317 abs_sum += abs;
duke@1 1318 }
duke@1 1319 }
duke@1 1320 tty->print_cr("----------------------------------------------------------------------");
duke@1 1321 float rel_sum = abs_sum * 100.0F / total;
duke@1 1322 tty->print_cr("%10d %7.2f%% (cutoff = %.2f%%)", abs_sum, rel_sum, cutoff);
duke@1 1323 tty->print_cr("----------------------------------------------------------------------");
duke@1 1324 tty->cr();
duke@1 1325 }
duke@1 1326 #endif
duke@1 1327
duke@1 1328 //----------------------------load_state_from----------------------------------
duke@1 1329 // Load block/map/sp. But not do not touch iter/bci.
duke@1 1330 void Parse::load_state_from(Block* block) {
duke@1 1331 set_block(block);
duke@1 1332 // load the block's JVM state:
duke@1 1333 set_map(block->start_map());
duke@1 1334 set_sp( block->start_sp());
duke@1 1335 }
duke@1 1336
duke@1 1337
duke@1 1338 //-----------------------------record_state------------------------------------
duke@1 1339 void Parse::Block::record_state(Parse* p) {
duke@1 1340 assert(!is_merged(), "can only record state once, on 1st inflow");
duke@1 1341 assert(start_sp() == p->sp(), "stack pointer must agree with ciTypeFlow");
duke@1 1342 set_start_map(p->stop());
duke@1 1343 }
duke@1 1344
duke@1 1345
duke@1 1346 //------------------------------do_one_block-----------------------------------
duke@1 1347 void Parse::do_one_block() {
duke@1 1348 if (TraceOptoParse) {
duke@1 1349 Block *b = block();
duke@1 1350 int ns = b->num_successors();
duke@1 1351 int nt = b->all_successors();
duke@1 1352
duke@1 1353 tty->print("Parsing block #%d at bci [%d,%d), successors: ",
never@1399 1354 block()->rpo(), block()->start(), block()->limit());
duke@1 1355 for (int i = 0; i < nt; i++) {
never@1399 1356 tty->print((( i < ns) ? " %d" : " %d(e)"), b->successor_at(i)->rpo());
duke@1 1357 }
never@1399 1358 if (b->is_loop_head()) tty->print(" lphd");
duke@1 1359 tty->print_cr("");
duke@1 1360 }
duke@1 1361
duke@1 1362 assert(block()->is_merged(), "must be merged before being parsed");
duke@1 1363 block()->mark_parsed();
duke@1 1364 ++_blocks_parsed;
duke@1 1365
duke@1 1366 // Set iterator to start of block.
duke@1 1367 iter().reset_to_bci(block()->start());
duke@1 1368
duke@1 1369 CompileLog* log = C->log();
duke@1 1370
duke@1 1371 // Parse bytecodes
duke@1 1372 while (!stopped() && !failing()) {
duke@1 1373 iter().next();
duke@1 1374
duke@1 1375 // Learn the current bci from the iterator:
duke@1 1376 set_parse_bci(iter().cur_bci());
duke@1 1377
duke@1 1378 if (bci() == block()->limit()) {
duke@1 1379 // Do not walk into the next block until directed by do_all_blocks.
duke@1 1380 merge(bci());
duke@1 1381 break;
duke@1 1382 }
duke@1 1383 assert(bci() < block()->limit(), "bci still in block");
duke@1 1384
duke@1 1385 if (log != NULL) {
duke@1 1386 // Output an optional context marker, to help place actions
duke@1 1387 // that occur during parsing of this BC. If there is no log
duke@1 1388 // output until the next context string, this context string
duke@1 1389 // will be silently ignored.
duke@1 1390 log->context()->reset();
duke@1 1391 log->context()->print_cr("<bc code='%d' bci='%d'/>", (int)bc(), bci());
duke@1 1392 }
duke@1 1393
duke@1 1394 if (block()->has_trap_at(bci())) {
duke@1 1395 // We must respect the flow pass's traps, because it will refuse
duke@1 1396 // to produce successors for trapping blocks.
duke@1 1397 int trap_index = block()->flow()->trap_index();
duke@1 1398 assert(trap_index != 0, "trap index must be valid");
duke@1 1399 uncommon_trap(trap_index);
duke@1 1400 break;
duke@1 1401 }
duke@1 1402
duke@1 1403 NOT_PRODUCT( parse_histogram()->set_initial_state(bc()); );
duke@1 1404
duke@1 1405 #ifdef ASSERT
duke@1 1406 int pre_bc_sp = sp();
duke@1 1407 int inputs, depth;
duke@1 1408 bool have_se = !stopped() && compute_stack_effects(inputs, depth);
duke@1 1409 assert(!have_se || pre_bc_sp >= inputs, "have enough stack to execute this BC");
duke@1 1410 #endif //ASSERT
duke@1 1411
duke@1 1412 do_one_bytecode();
duke@1 1413
duke@1 1414 assert(!have_se || stopped() || failing() || (sp() - pre_bc_sp) == depth, "correct depth prediction");
duke@1 1415
duke@1 1416 do_exceptions();
duke@1 1417
duke@1 1418 NOT_PRODUCT( parse_histogram()->record_change(); );
duke@1 1419
duke@1 1420 if (log != NULL) log->context()->reset(); // done w/ this one
duke@1 1421
duke@1 1422 // Fall into next bytecode. Each bytecode normally has 1 sequential
duke@1 1423 // successor which is typically made ready by visiting this bytecode.
duke@1 1424 // If the successor has several predecessors, then it is a merge
duke@1 1425 // point, starts a new basic block, and is handled like other basic blocks.
duke@1 1426 }
duke@1 1427 }
duke@1 1428
duke@1 1429
duke@1 1430 //------------------------------merge------------------------------------------
duke@1 1431 void Parse::set_parse_bci(int bci) {
duke@1 1432 set_bci(bci);
duke@1 1433 Node_Notes* nn = C->default_node_notes();
duke@1 1434 if (nn == NULL) return;
duke@1 1435
duke@1 1436 // Collect debug info for inlined calls unless -XX:-DebugInlinedCalls.
duke@1 1437 if (!DebugInlinedCalls && depth() > 1) {
duke@1 1438 return;
duke@1 1439 }
duke@1 1440
duke@1 1441 // Update the JVMS annotation, if present.
duke@1 1442 JVMState* jvms = nn->jvms();
duke@1 1443 if (jvms != NULL && jvms->bci() != bci) {
duke@1 1444 // Update the JVMS.
duke@1 1445 jvms = jvms->clone_shallow(C);
duke@1 1446 jvms->set_bci(bci);
duke@1 1447 nn->set_jvms(jvms);
duke@1 1448 }
duke@1 1449 }
duke@1 1450
duke@1 1451 //------------------------------merge------------------------------------------
duke@1 1452 // Merge the current mapping into the basic block starting at bci
duke@1 1453 void Parse::merge(int target_bci) {
duke@1 1454 Block* target = successor_for_bci(target_bci);
duke@1 1455 if (target == NULL) { handle_missing_successor(target_bci); return; }
duke@1 1456 assert(!target->is_ready(), "our arrival must be expected");
duke@1 1457 int pnum = target->next_path_num();
duke@1 1458 merge_common(target, pnum);
duke@1 1459 }
duke@1 1460
duke@1 1461 //-------------------------merge_new_path--------------------------------------
duke@1 1462 // Merge the current mapping into the basic block, using a new path
duke@1 1463 void Parse::merge_new_path(int target_bci) {
duke@1 1464 Block* target = successor_for_bci(target_bci);
duke@1 1465 if (target == NULL) { handle_missing_successor(target_bci); return; }
duke@1 1466 assert(!target->is_ready(), "new path into frozen graph");
duke@1 1467 int pnum = target->add_new_path();
duke@1 1468 merge_common(target, pnum);
duke@1 1469 }
duke@1 1470
duke@1 1471 //-------------------------merge_exception-------------------------------------
duke@1 1472 // Merge the current mapping into the basic block starting at bci
duke@1 1473 // The ex_oop must be pushed on the stack, unlike throw_to_exit.
duke@1 1474 void Parse::merge_exception(int target_bci) {
duke@1 1475 assert(sp() == 1, "must have only the throw exception on the stack");
duke@1 1476 Block* target = successor_for_bci(target_bci);
duke@1 1477 if (target == NULL) { handle_missing_successor(target_bci); return; }
duke@1 1478 assert(target->is_handler(), "exceptions are handled by special blocks");
duke@1 1479 int pnum = target->add_new_path();
duke@1 1480 merge_common(target, pnum);
duke@1 1481 }
duke@1 1482
duke@1 1483 //--------------------handle_missing_successor---------------------------------
duke@1 1484 void Parse::handle_missing_successor(int target_bci) {
duke@1 1485 #ifndef PRODUCT
duke@1 1486 Block* b = block();
duke@1 1487 int trap_bci = b->flow()->has_trap()? b->flow()->trap_bci(): -1;
never@1399 1488 tty->print_cr("### Missing successor at bci:%d for block #%d (trap_bci:%d)", target_bci, b->rpo(), trap_bci);
duke@1 1489 #endif
duke@1 1490 ShouldNotReachHere();
duke@1 1491 }
duke@1 1492
duke@1 1493 //--------------------------merge_common---------------------------------------
duke@1 1494 void Parse::merge_common(Parse::Block* target, int pnum) {
duke@1 1495 if (TraceOptoParse) {
never@1399 1496 tty->print("Merging state at block #%d bci:%d", target->rpo(), target->start());
duke@1 1497 }
duke@1 1498
duke@1 1499 // Zap extra stack slots to top
duke@1 1500 assert(sp() == target->start_sp(), "");
duke@1 1501 clean_stack(sp());
duke@1 1502
duke@1 1503 if (!target->is_merged()) { // No prior mapping at this bci
duke@1 1504 if (TraceOptoParse) { tty->print(" with empty state"); }
duke@1 1505
duke@1 1506 // If this path is dead, do not bother capturing it as a merge.
duke@1 1507 // It is "as if" we had 1 fewer predecessors from the beginning.
duke@1 1508 if (stopped()) {
duke@1 1509 if (TraceOptoParse) tty->print_cr(", but path is dead and doesn't count");
duke@1 1510 return;
duke@1 1511 }
duke@1 1512
duke@1 1513 // Record that a new block has been merged.
duke@1 1514 ++_blocks_merged;
duke@1 1515
duke@1 1516 // Make a region if we know there are multiple or unpredictable inputs.
duke@1 1517 // (Also, if this is a plain fall-through, we might see another region,
duke@1 1518 // which must not be allowed into this block's map.)
duke@1 1519 if (pnum > PhiNode::Input // Known multiple inputs.
duke@1 1520 || target->is_handler() // These have unpredictable inputs.
never@1399 1521 || target->is_loop_head() // Known multiple inputs
duke@1 1522 || control()->is_Region()) { // We must hide this guy.
duke@1 1523 // Add a Region to start the new basic block. Phis will be added
duke@1 1524 // later lazily.
duke@1 1525 int edges = target->pred_count();
duke@1 1526 if (edges < pnum) edges = pnum; // might be a new path!
duke@1 1527 Node *r = new (C, edges+1) RegionNode(edges+1);
duke@1 1528 gvn().set_type(r, Type::CONTROL);
duke@1 1529 record_for_igvn(r);
duke@1 1530 // zap all inputs to NULL for debugging (done in Node(uint) constructor)
duke@1 1531 // for (int j = 1; j < edges+1; j++) { r->init_req(j, NULL); }
duke@1 1532 r->init_req(pnum, control());
duke@1 1533 set_control(r);
duke@1 1534 }
duke@1 1535
duke@1 1536 // Convert the existing Parser mapping into a mapping at this bci.
duke@1 1537 store_state_to(target);
duke@1 1538 assert(target->is_merged(), "do not come here twice");
duke@1 1539
duke@1 1540 } else { // Prior mapping at this bci
duke@1 1541 if (TraceOptoParse) { tty->print(" with previous state"); }
duke@1 1542
duke@1 1543 // We must not manufacture more phis if the target is already parsed.
duke@1 1544 bool nophi = target->is_parsed();
duke@1 1545
duke@1 1546 SafePointNode* newin = map();// Hang on to incoming mapping
duke@1 1547 Block* save_block = block(); // Hang on to incoming block;
duke@1 1548 load_state_from(target); // Get prior mapping
duke@1 1549
duke@1 1550 assert(newin->jvms()->locoff() == jvms()->locoff(), "JVMS layouts agree");
duke@1 1551 assert(newin->jvms()->stkoff() == jvms()->stkoff(), "JVMS layouts agree");
duke@1 1552 assert(newin->jvms()->monoff() == jvms()->monoff(), "JVMS layouts agree");
duke@1 1553 assert(newin->jvms()->endoff() == jvms()->endoff(), "JVMS layouts agree");
duke@1 1554
duke@1 1555 // Iterate over my current mapping and the old mapping.
duke@1 1556 // Where different, insert Phi functions.
duke@1 1557 // Use any existing Phi functions.
duke@1 1558 assert(control()->is_Region(), "must be merging to a region");
duke@1 1559 RegionNode* r = control()->as_Region();
duke@1 1560
duke@1 1561 // Compute where to merge into
duke@1 1562 // Merge incoming control path
never@1399 1563 r->init_req(pnum, newin->control());
duke@1 1564
duke@1 1565 if (pnum == 1) { // Last merge for this Region?
never@1399 1566 if (!block()->flow()->is_irreducible_entry()) {
never@1399 1567 Node* result = _gvn.transform_no_reclaim(r);
never@1399 1568 if (r != result && TraceOptoParse) {
never@1399 1569 tty->print_cr("Block #%d replace %d with %d", block()->rpo(), r->_idx, result->_idx);
never@1399 1570 }
never@1399 1571 }
duke@1 1572 record_for_igvn(r);
duke@1 1573 }
duke@1 1574
duke@1 1575 // Update all the non-control inputs to map:
duke@1 1576 assert(TypeFunc::Parms == newin->jvms()->locoff(), "parser map should contain only youngest jvms");
never@1399 1577 bool check_elide_phi = target->is_SEL_backedge(save_block);
duke@1 1578 for (uint j = 1; j < newin->req(); j++) {
duke@1 1579 Node* m = map()->in(j); // Current state of target.
duke@1 1580 Node* n = newin->in(j); // Incoming change to target state.
duke@1 1581 PhiNode* phi;
duke@1 1582 if (m->is_Phi() && m->as_Phi()->region() == r)
duke@1 1583 phi = m->as_Phi();
duke@1 1584 else
duke@1 1585 phi = NULL;
duke@1 1586 if (m != n) { // Different; must merge
duke@1 1587 switch (j) {
duke@1 1588 // Frame pointer and Return Address never changes
duke@1 1589 case TypeFunc::FramePtr:// Drop m, use the original value
duke@1 1590 case TypeFunc::ReturnAdr:
duke@1 1591 break;
duke@1 1592 case TypeFunc::Memory: // Merge inputs to the MergeMem node
duke@1 1593 assert(phi == NULL, "the merge contains phis, not vice versa");
duke@1 1594 merge_memory_edges(n->as_MergeMem(), pnum, nophi);
duke@1 1595 continue;
duke@1 1596 default: // All normal stuff
never@1399 1597 if (phi == NULL) {
never@1399 1598 if (!check_elide_phi || !target->can_elide_SEL_phi(j)) {
never@1399 1599 phi = ensure_phi(j, nophi);
never@1399 1600 }
never@1399 1601 }
duke@1 1602 break;
duke@1 1603 }
duke@1 1604 }
duke@1 1605 // At this point, n might be top if:
duke@1 1606 // - there is no phi (because TypeFlow detected a conflict), or
duke@1 1607 // - the corresponding control edges is top (a dead incoming path)
duke@1 1608 // It is a bug if we create a phi which sees a garbage value on a live path.
duke@1 1609
duke@1 1610 if (phi != NULL) {
duke@1 1611 assert(n != top() || r->in(pnum) == top(), "live value must not be garbage");
duke@1 1612 assert(phi->region() == r, "");
duke@1 1613 phi->set_req(pnum, n); // Then add 'n' to the merge
duke@1 1614 if (pnum == PhiNode::Input) {
duke@1 1615 // Last merge for this Phi.
duke@1 1616 // So far, Phis have had a reasonable type from ciTypeFlow.
duke@1 1617 // Now _gvn will join that with the meet of current inputs.
duke@1 1618 // BOTTOM is never permissible here, 'cause pessimistically
duke@1 1619 // Phis of pointers cannot lose the basic pointer type.
duke@1 1620 debug_only(const Type* bt1 = phi->bottom_type());
duke@1 1621 assert(bt1 != Type::BOTTOM, "should not be building conflict phis");
duke@1 1622 map()->set_req(j, _gvn.transform_no_reclaim(phi));
duke@1 1623 debug_only(const Type* bt2 = phi->bottom_type());
duke@1 1624 assert(bt2->higher_equal(bt1), "must be consistent with type-flow");
duke@1 1625 record_for_igvn(phi);
duke@1 1626 }
duke@1 1627 }
duke@1 1628 } // End of for all values to be merged
duke@1 1629
duke@1 1630 if (pnum == PhiNode::Input &&
duke@1 1631 !r->in(0)) { // The occasional useless Region
duke@1 1632 assert(control() == r, "");
duke@1 1633 set_control(r->nonnull_req());
duke@1 1634 }
duke@1 1635
duke@1 1636 // newin has been subsumed into the lazy merge, and is now dead.
duke@1 1637 set_block(save_block);
duke@1 1638
duke@1 1639 stop(); // done with this guy, for now
duke@1 1640 }
duke@1 1641
duke@1 1642 if (TraceOptoParse) {
duke@1 1643 tty->print_cr(" on path %d", pnum);
duke@1 1644 }
duke@1 1645
duke@1 1646 // Done with this parser state.
duke@1 1647 assert(stopped(), "");
duke@1 1648 }
duke@1 1649
duke@1 1650
duke@1 1651 //--------------------------merge_memory_edges---------------------------------
duke@1 1652 void Parse::merge_memory_edges(MergeMemNode* n, int pnum, bool nophi) {
duke@1 1653 // (nophi means we must not create phis, because we already parsed here)
duke@1 1654 assert(n != NULL, "");
duke@1 1655 // Merge the inputs to the MergeMems
duke@1 1656 MergeMemNode* m = merged_memory();
duke@1 1657
duke@1 1658 assert(control()->is_Region(), "must be merging to a region");
duke@1 1659 RegionNode* r = control()->as_Region();
duke@1 1660
duke@1 1661 PhiNode* base = NULL;
duke@1 1662 MergeMemNode* remerge = NULL;
duke@1 1663 for (MergeMemStream mms(m, n); mms.next_non_empty2(); ) {
duke@1 1664 Node *p = mms.force_memory();
duke@1 1665 Node *q = mms.memory2();
duke@1 1666 if (mms.is_empty() && nophi) {
duke@1 1667 // Trouble: No new splits allowed after a loop body is parsed.
duke@1 1668 // Instead, wire the new split into a MergeMem on the backedge.
duke@1 1669 // The optimizer will sort it out, slicing the phi.
duke@1 1670 if (remerge == NULL) {
duke@1 1671 assert(base != NULL, "");
duke@1 1672 assert(base->in(0) != NULL, "should not be xformed away");
duke@1 1673 remerge = MergeMemNode::make(C, base->in(pnum));
duke@1 1674 gvn().set_type(remerge, Type::MEMORY);
duke@1 1675 base->set_req(pnum, remerge);
duke@1 1676 }
duke@1 1677 remerge->set_memory_at(mms.alias_idx(), q);
duke@1 1678 continue;
duke@1 1679 }
duke@1 1680 assert(!q->is_MergeMem(), "");
duke@1 1681 PhiNode* phi;
duke@1 1682 if (p != q) {
duke@1 1683 phi = ensure_memory_phi(mms.alias_idx(), nophi);
duke@1 1684 } else {
duke@1 1685 if (p->is_Phi() && p->as_Phi()->region() == r)
duke@1 1686 phi = p->as_Phi();
duke@1 1687 else
duke@1 1688 phi = NULL;
duke@1 1689 }
duke@1 1690 // Insert q into local phi
duke@1 1691 if (phi != NULL) {
duke@1 1692 assert(phi->region() == r, "");
duke@1 1693 p = phi;
duke@1 1694 phi->set_req(pnum, q);
duke@1 1695 if (mms.at_base_memory()) {
duke@1 1696 base = phi; // delay transforming it
duke@1 1697 } else if (pnum == 1) {
duke@1 1698 record_for_igvn(phi);
duke@1 1699 p = _gvn.transform_no_reclaim(phi);
duke@1 1700 }
duke@1 1701 mms.set_memory(p);// store back through the iterator
duke@1 1702 }
duke@1 1703 }
duke@1 1704 // Transform base last, in case we must fiddle with remerging.
duke@1 1705 if (base != NULL && pnum == 1) {
duke@1 1706 record_for_igvn(base);
duke@1 1707 m->set_base_memory( _gvn.transform_no_reclaim(base) );
duke@1 1708 }
duke@1 1709 }
duke@1 1710
duke@1 1711
duke@1 1712 //------------------------ensure_phis_everywhere-------------------------------
duke@1 1713 void Parse::ensure_phis_everywhere() {
duke@1 1714 ensure_phi(TypeFunc::I_O);
duke@1 1715
duke@1 1716 // Ensure a phi on all currently known memories.
duke@1 1717 for (MergeMemStream mms(merged_memory()); mms.next_non_empty(); ) {
duke@1 1718 ensure_memory_phi(mms.alias_idx());
duke@1 1719 debug_only(mms.set_memory()); // keep the iterator happy
duke@1 1720 }
duke@1 1721
duke@1 1722 // Note: This is our only chance to create phis for memory slices.
duke@1 1723 // If we miss a slice that crops up later, it will have to be
duke@1 1724 // merged into the base-memory phi that we are building here.
duke@1 1725 // Later, the optimizer will comb out the knot, and build separate
duke@1 1726 // phi-loops for each memory slice that matters.
duke@1 1727
duke@1 1728 // Monitors must nest nicely and not get confused amongst themselves.
duke@1 1729 // Phi-ify everything up to the monitors, though.
duke@1 1730 uint monoff = map()->jvms()->monoff();
duke@1 1731 uint nof_monitors = map()->jvms()->nof_monitors();
duke@1 1732
duke@1 1733 assert(TypeFunc::Parms == map()->jvms()->locoff(), "parser map should contain only youngest jvms");
never@1399 1734 bool check_elide_phi = block()->is_SEL_head();
duke@1 1735 for (uint i = TypeFunc::Parms; i < monoff; i++) {
never@1399 1736 if (!check_elide_phi || !block()->can_elide_SEL_phi(i)) {
never@1399 1737 ensure_phi(i);
never@1399 1738 }
duke@1 1739 }
never@1399 1740
duke@1 1741 // Even monitors need Phis, though they are well-structured.
duke@1 1742 // This is true for OSR methods, and also for the rare cases where
duke@1 1743 // a monitor object is the subject of a replace_in_map operation.
duke@1 1744 // See bugs 4426707 and 5043395.
duke@1 1745 for (uint m = 0; m < nof_monitors; m++) {
duke@1 1746 ensure_phi(map()->jvms()->monitor_obj_offset(m));
duke@1 1747 }
duke@1 1748 }
duke@1 1749
duke@1 1750
duke@1 1751 //-----------------------------add_new_path------------------------------------
duke@1 1752 // Add a previously unaccounted predecessor to this block.
duke@1 1753 int Parse::Block::add_new_path() {
duke@1 1754 // If there is no map, return the lowest unused path number.
duke@1 1755 if (!is_merged()) return pred_count()+1; // there will be a map shortly
duke@1 1756
duke@1 1757 SafePointNode* map = start_map();
duke@1 1758 if (!map->control()->is_Region())
duke@1 1759 return pred_count()+1; // there may be a region some day
duke@1 1760 RegionNode* r = map->control()->as_Region();
duke@1 1761
duke@1 1762 // Add new path to the region.
duke@1 1763 uint pnum = r->req();
duke@1 1764 r->add_req(NULL);
duke@1 1765
duke@1 1766 for (uint i = 1; i < map->req(); i++) {
duke@1 1767 Node* n = map->in(i);
duke@1 1768 if (i == TypeFunc::Memory) {
duke@1 1769 // Ensure a phi on all currently known memories.
duke@1 1770 for (MergeMemStream mms(n->as_MergeMem()); mms.next_non_empty(); ) {
duke@1 1771 Node* phi = mms.memory();
duke@1 1772 if (phi->is_Phi() && phi->as_Phi()->region() == r) {
duke@1 1773 assert(phi->req() == pnum, "must be same size as region");
duke@1 1774 phi->add_req(NULL);
duke@1 1775 }
duke@1 1776 }
duke@1 1777 } else {
duke@1 1778 if (n->is_Phi() && n->as_Phi()->region() == r) {
duke@1 1779 assert(n->req() == pnum, "must be same size as region");
duke@1 1780 n->add_req(NULL);
duke@1 1781 }
duke@1 1782 }
duke@1 1783 }
duke@1 1784
duke@1 1785 return pnum;
duke@1 1786 }
duke@1 1787
duke@1 1788 //------------------------------ensure_phi-------------------------------------
duke@1 1789 // Turn the idx'th entry of the current map into a Phi
duke@1 1790 PhiNode *Parse::ensure_phi(int idx, bool nocreate) {
duke@1 1791 SafePointNode* map = this->map();
duke@1 1792 Node* region = map->control();
duke@1 1793 assert(region->is_Region(), "");
duke@1 1794
duke@1 1795 Node* o = map->in(idx);
duke@1 1796 assert(o != NULL, "");
duke@1 1797
duke@1 1798 if (o == top()) return NULL; // TOP always merges into TOP
duke@1 1799
duke@1 1800 if (o->is_Phi() && o->as_Phi()->region() == region) {
duke@1 1801 return o->as_Phi();
duke@1 1802 }
duke@1 1803
duke@1 1804 // Now use a Phi here for merging
duke@1 1805 assert(!nocreate, "Cannot build a phi for a block already parsed.");
duke@1 1806 const JVMState* jvms = map->jvms();
duke@1 1807 const Type* t;
duke@1 1808 if (jvms->is_loc(idx)) {
duke@1 1809 t = block()->local_type_at(idx - jvms->locoff());
duke@1 1810 } else if (jvms->is_stk(idx)) {
duke@1 1811 t = block()->stack_type_at(idx - jvms->stkoff());
duke@1 1812 } else if (jvms->is_mon(idx)) {
duke@1 1813 assert(!jvms->is_monitor_box(idx), "no phis for boxes");
duke@1 1814 t = TypeInstPtr::BOTTOM; // this is sufficient for a lock object
duke@1 1815 } else if ((uint)idx < TypeFunc::Parms) {
duke@1 1816 t = o->bottom_type(); // Type::RETURN_ADDRESS or such-like.
duke@1 1817 } else {
duke@1 1818 assert(false, "no type information for this phi");
duke@1 1819 }
duke@1 1820
duke@1 1821 // If the type falls to bottom, then this must be a local that
duke@1 1822 // is mixing ints and oops or some such. Forcing it to top
duke@1 1823 // makes it go dead.
duke@1 1824 if (t == Type::BOTTOM) {
duke@1 1825 map->set_req(idx, top());
duke@1 1826 return NULL;
duke@1 1827 }
duke@1 1828
duke@1 1829 // Do not create phis for top either.
duke@1 1830 // A top on a non-null control flow must be an unused even after the.phi.
duke@1 1831 if (t == Type::TOP || t == Type::HALF) {
duke@1 1832 map->set_req(idx, top());
duke@1 1833 return NULL;
duke@1 1834 }
duke@1 1835
duke@1 1836 PhiNode* phi = PhiNode::make(region, o, t);
duke@1 1837 gvn().set_type(phi, t);
kvn@211 1838 if (C->do_escape_analysis()) record_for_igvn(phi);
duke@1 1839 map->set_req(idx, phi);
duke@1 1840 return phi;
duke@1 1841 }
duke@1 1842
duke@1 1843 //--------------------------ensure_memory_phi----------------------------------
duke@1 1844 // Turn the idx'th slice of the current memory into a Phi
duke@1 1845 PhiNode *Parse::ensure_memory_phi(int idx, bool nocreate) {
duke@1 1846 MergeMemNode* mem = merged_memory();
duke@1 1847 Node* region = control();
duke@1 1848 assert(region->is_Region(), "");
duke@1 1849
duke@1 1850 Node *o = (idx == Compile::AliasIdxBot)? mem->base_memory(): mem->memory_at(idx);
duke@1 1851 assert(o != NULL && o != top(), "");
duke@1 1852
duke@1 1853 PhiNode* phi;
duke@1 1854 if (o->is_Phi() && o->as_Phi()->region() == region) {
duke@1 1855 phi = o->as_Phi();
duke@1 1856 if (phi == mem->base_memory() && idx >= Compile::AliasIdxRaw) {
duke@1 1857 // clone the shared base memory phi to make a new memory split
duke@1 1858 assert(!nocreate, "Cannot build a phi for a block already parsed.");
duke@1 1859 const Type* t = phi->bottom_type();
duke@1 1860 const TypePtr* adr_type = C->get_adr_type(idx);
duke@1 1861 phi = phi->slice_memory(adr_type);
duke@1 1862 gvn().set_type(phi, t);
duke@1 1863 }
duke@1 1864 return phi;
duke@1 1865 }
duke@1 1866
duke@1 1867 // Now use a Phi here for merging
duke@1 1868 assert(!nocreate, "Cannot build a phi for a block already parsed.");
duke@1 1869 const Type* t = o->bottom_type();
duke@1 1870 const TypePtr* adr_type = C->get_adr_type(idx);
duke@1 1871 phi = PhiNode::make(region, o, t, adr_type);
duke@1 1872 gvn().set_type(phi, t);
duke@1 1873 if (idx == Compile::AliasIdxBot)
duke@1 1874 mem->set_base_memory(phi);
duke@1 1875 else
duke@1 1876 mem->set_memory_at(idx, phi);
duke@1 1877 return phi;
duke@1 1878 }
duke@1 1879
duke@1 1880 //------------------------------call_register_finalizer-----------------------
duke@1 1881 // Check the klass of the receiver and call register_finalizer if the
duke@1 1882 // class need finalization.
duke@1 1883 void Parse::call_register_finalizer() {
duke@1 1884 Node* receiver = local(0);
duke@1 1885 assert(receiver != NULL && receiver->bottom_type()->isa_instptr() != NULL,
duke@1 1886 "must have non-null instance type");
duke@1 1887
duke@1 1888 const TypeInstPtr *tinst = receiver->bottom_type()->isa_instptr();
duke@1 1889 if (tinst != NULL && tinst->klass()->is_loaded() && !tinst->klass_is_exact()) {
duke@1 1890 // The type isn't known exactly so see if CHA tells us anything.
duke@1 1891 ciInstanceKlass* ik = tinst->klass()->as_instance_klass();
duke@1 1892 if (!Dependencies::has_finalizable_subclass(ik)) {
duke@1 1893 // No finalizable subclasses so skip the dynamic check.
duke@1 1894 C->dependencies()->assert_has_no_finalizable_subclasses(ik);
duke@1 1895 return;
duke@1 1896 }
duke@1 1897 }
duke@1 1898
duke@1 1899 // Insert a dynamic test for whether the instance needs
duke@1 1900 // finalization. In general this will fold up since the concrete
duke@1 1901 // class is often visible so the access flags are constant.
duke@1 1902 Node* klass_addr = basic_plus_adr( receiver, receiver, oopDesc::klass_offset_in_bytes() );
kvn@590 1903 Node* klass = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), klass_addr, TypeInstPtr::KLASS) );
duke@1 1904
duke@1 1905 Node* access_flags_addr = basic_plus_adr(klass, klass, Klass::access_flags_offset_in_bytes() + sizeof(oopDesc));
duke@1 1906 Node* access_flags = make_load(NULL, access_flags_addr, TypeInt::INT, T_INT);
duke@1 1907
duke@1 1908 Node* mask = _gvn.transform(new (C, 3) AndINode(access_flags, intcon(JVM_ACC_HAS_FINALIZER)));
duke@1 1909 Node* check = _gvn.transform(new (C, 3) CmpINode(mask, intcon(0)));
duke@1 1910 Node* test = _gvn.transform(new (C, 2) BoolNode(check, BoolTest::ne));
duke@1 1911
duke@1 1912 IfNode* iff = create_and_map_if(control(), test, PROB_MAX, COUNT_UNKNOWN);
duke@1 1913
duke@1 1914 RegionNode* result_rgn = new (C, 3) RegionNode(3);
duke@1 1915 record_for_igvn(result_rgn);
duke@1 1916
duke@1 1917 Node *skip_register = _gvn.transform(new (C, 1) IfFalseNode(iff));
duke@1 1918 result_rgn->init_req(1, skip_register);
duke@1 1919
duke@1 1920 Node *needs_register = _gvn.transform(new (C, 1) IfTrueNode(iff));
duke@1 1921 set_control(needs_register);
duke@1 1922 if (stopped()) {
duke@1 1923 // There is no slow path.
duke@1 1924 result_rgn->init_req(2, top());
duke@1 1925 } else {
duke@1 1926 Node *call = make_runtime_call(RC_NO_LEAF,
duke@1 1927 OptoRuntime::register_finalizer_Type(),
duke@1 1928 OptoRuntime::register_finalizer_Java(),
duke@1 1929 NULL, TypePtr::BOTTOM,
duke@1 1930 receiver);
duke@1 1931 make_slow_call_ex(call, env()->Throwable_klass(), true);
duke@1 1932
duke@1 1933 Node* fast_io = call->in(TypeFunc::I_O);
duke@1 1934 Node* fast_mem = call->in(TypeFunc::Memory);
duke@1 1935 // These two phis are pre-filled with copies of of the fast IO and Memory
duke@1 1936 Node* io_phi = PhiNode::make(result_rgn, fast_io, Type::ABIO);
duke@1 1937 Node* mem_phi = PhiNode::make(result_rgn, fast_mem, Type::MEMORY, TypePtr::BOTTOM);
duke@1 1938
duke@1 1939 result_rgn->init_req(2, control());
duke@1 1940 io_phi ->init_req(2, i_o());
duke@1 1941 mem_phi ->init_req(2, reset_memory());
duke@1 1942
duke@1 1943 set_all_memory( _gvn.transform(mem_phi) );
duke@1 1944 set_i_o( _gvn.transform(io_phi) );
duke@1 1945 }
duke@1 1946
duke@1 1947 set_control( _gvn.transform(result_rgn) );
duke@1 1948 }
duke@1 1949
duke@1 1950 //------------------------------return_current---------------------------------
duke@1 1951 // Append current _map to _exit_return
duke@1 1952 void Parse::return_current(Node* value) {
duke@1 1953 if (RegisterFinalizersAtInit &&
duke@1 1954 method()->intrinsic_id() == vmIntrinsics::_Object_init) {
duke@1 1955 call_register_finalizer();
duke@1 1956 }
duke@1 1957
duke@1 1958 // Do not set_parse_bci, so that return goo is credited to the return insn.
duke@1 1959 set_bci(InvocationEntryBci);
duke@1 1960 if (method()->is_synchronized() && GenerateSynchronizationCode) {
duke@1 1961 shared_unlock(_synch_lock->box_node(), _synch_lock->obj_node());
duke@1 1962 }
kvn@2867 1963 if (C->env()->dtrace_method_probes()) {
duke@1 1964 make_dtrace_method_exit(method());
duke@1 1965 }
duke@1 1966 SafePointNode* exit_return = _exits.map();
duke@1 1967 exit_return->in( TypeFunc::Control )->add_req( control() );
duke@1 1968 exit_return->in( TypeFunc::I_O )->add_req( i_o () );
duke@1 1969 Node *mem = exit_return->in( TypeFunc::Memory );
duke@1 1970 for (MergeMemStream mms(mem->as_MergeMem(), merged_memory()); mms.next_non_empty2(); ) {
duke@1 1971 if (mms.is_empty()) {
duke@1 1972 // get a copy of the base memory, and patch just this one input
duke@1 1973 const TypePtr* adr_type = mms.adr_type(C);
duke@1 1974 Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type);
duke@1 1975 assert(phi->as_Phi()->region() == mms.base_memory()->in(0), "");
duke@1 1976 gvn().set_type_bottom(phi);
duke@1 1977 phi->del_req(phi->req()-1); // prepare to re-patch
duke@1 1978 mms.set_memory(phi);
duke@1 1979 }
duke@1 1980 mms.memory()->add_req(mms.memory2());
duke@1 1981 }
duke@1 1982
duke@1 1983 // frame pointer is always same, already captured
duke@1 1984 if (value != NULL) {
duke@1 1985 // If returning oops to an interface-return, there is a silent free
duke@1 1986 // cast from oop to interface allowed by the Verifier. Make it explicit
duke@1 1987 // here.
duke@1 1988 Node* phi = _exits.argument(0);
duke@1 1989 const TypeInstPtr *tr = phi->bottom_type()->isa_instptr();
duke@1 1990 if( tr && tr->klass()->is_loaded() &&
duke@1 1991 tr->klass()->is_interface() ) {
duke@1 1992 const TypeInstPtr *tp = value->bottom_type()->isa_instptr();
duke@1 1993 if (tp && tp->klass()->is_loaded() &&
duke@1 1994 !tp->klass()->is_interface()) {
duke@1 1995 // sharpen the type eagerly; this eases certain assert checking
duke@1 1996 if (tp->higher_equal(TypeInstPtr::NOTNULL))
duke@1 1997 tr = tr->join(TypeInstPtr::NOTNULL)->is_instptr();
duke@1 1998 value = _gvn.transform(new (C, 2) CheckCastPPNode(0,value,tr));
duke@1 1999 }
duke@1 2000 }
duke@1 2001 phi->add_req(value);
duke@1 2002 }
duke@1 2003
duke@1 2004 stop_and_kill_map(); // This CFG path dies here
duke@1 2005 }
duke@1 2006
duke@1 2007
duke@1 2008 //------------------------------add_safepoint----------------------------------
duke@1 2009 void Parse::add_safepoint() {
duke@1 2010 // See if we can avoid this safepoint. No need for a SafePoint immediately
duke@1 2011 // after a Call (except Leaf Call) or another SafePoint.
duke@1 2012 Node *proj = control();
duke@1 2013 bool add_poll_param = SafePointNode::needs_polling_address_input();
duke@1 2014 uint parms = add_poll_param ? TypeFunc::Parms+1 : TypeFunc::Parms;
duke@1 2015 if( proj->is_Proj() ) {
duke@1 2016 Node *n0 = proj->in(0);
duke@1 2017 if( n0->is_Catch() ) {
duke@1 2018 n0 = n0->in(0)->in(0);
duke@1 2019 assert( n0->is_Call(), "expect a call here" );
duke@1 2020 }
duke@1 2021 if( n0->is_Call() ) {
duke@1 2022 if( n0->as_Call()->guaranteed_safepoint() )
duke@1 2023 return;
duke@1 2024 } else if( n0->is_SafePoint() && n0->req() >= parms ) {
duke@1 2025 return;
duke@1 2026 }
duke@1 2027 }
duke@1 2028
duke@1 2029 // Clear out dead values from the debug info.
duke@1 2030 kill_dead_locals();
duke@1 2031
duke@1 2032 // Clone the JVM State
duke@1 2033 SafePointNode *sfpnt = new (C, parms) SafePointNode(parms, NULL);
duke@1 2034
duke@1 2035 // Capture memory state BEFORE a SafePoint. Since we can block at a
duke@1 2036 // SafePoint we need our GC state to be safe; i.e. we need all our current
duke@1 2037 // write barriers (card marks) to not float down after the SafePoint so we
duke@1 2038 // must read raw memory. Likewise we need all oop stores to match the card
duke@1 2039 // marks. If deopt can happen, we need ALL stores (we need the correct JVM
duke@1 2040 // state on a deopt).
duke@1 2041
duke@1 2042 // We do not need to WRITE the memory state after a SafePoint. The control
duke@1 2043 // edge will keep card-marks and oop-stores from floating up from below a
duke@1 2044 // SafePoint and our true dependency added here will keep them from floating
duke@1 2045 // down below a SafePoint.
duke@1 2046
duke@1 2047 // Clone the current memory state
duke@1 2048 Node* mem = MergeMemNode::make(C, map()->memory());
duke@1 2049
duke@1 2050 mem = _gvn.transform(mem);
duke@1 2051
duke@1 2052 // Pass control through the safepoint
duke@1 2053 sfpnt->init_req(TypeFunc::Control , control());
duke@1 2054 // Fix edges normally used by a call
duke@1 2055 sfpnt->init_req(TypeFunc::I_O , top() );
duke@1 2056 sfpnt->init_req(TypeFunc::Memory , mem );
duke@1 2057 sfpnt->init_req(TypeFunc::ReturnAdr, top() );
duke@1 2058 sfpnt->init_req(TypeFunc::FramePtr , top() );
duke@1 2059
duke@1 2060 // Create a node for the polling address
duke@1 2061 if( add_poll_param ) {
duke@1 2062 Node *polladr = ConPNode::make(C, (address)os::get_polling_page());
duke@1 2063 sfpnt->init_req(TypeFunc::Parms+0, _gvn.transform(polladr));
duke@1 2064 }
duke@1 2065
duke@1 2066 // Fix up the JVM State edges
duke@1 2067 add_safepoint_edges(sfpnt);
duke@1 2068 Node *transformed_sfpnt = _gvn.transform(sfpnt);
duke@1 2069 set_control(transformed_sfpnt);
duke@1 2070
duke@1 2071 // Provide an edge from root to safepoint. This makes the safepoint
duke@1 2072 // appear useful until the parse has completed.
duke@1 2073 if( OptoRemoveUseless && transformed_sfpnt->is_SafePoint() ) {
duke@1 2074 assert(C->root() != NULL, "Expect parse is still valid");
duke@1 2075 C->root()->add_prec(transformed_sfpnt);
duke@1 2076 }
duke@1 2077 }
duke@1 2078
duke@1 2079 #ifndef PRODUCT
duke@1 2080 //------------------------show_parse_info--------------------------------------
duke@1 2081 void Parse::show_parse_info() {
duke@1 2082 InlineTree* ilt = NULL;
duke@1 2083 if (C->ilt() != NULL) {
duke@1 2084 JVMState* caller_jvms = is_osr_parse() ? caller()->caller() : caller();
duke@1 2085 ilt = InlineTree::find_subtree_from_root(C->ilt(), caller_jvms, method());
duke@1 2086 }
duke@1 2087 if (PrintCompilation && Verbose) {
duke@1 2088 if (depth() == 1) {
duke@1 2089 if( ilt->count_inlines() ) {
duke@1 2090 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(),
duke@1 2091 ilt->count_inline_bcs());
duke@1 2092 tty->cr();
duke@1 2093 }
duke@1 2094 } else {
duke@1 2095 if (method()->is_synchronized()) tty->print("s");
duke@1 2096 if (method()->has_exception_handlers()) tty->print("!");
duke@1 2097 // Check this is not the final compiled version
duke@1 2098 if (C->trap_can_recompile()) {
duke@1 2099 tty->print("-");
duke@1 2100 } else {
duke@1 2101 tty->print(" ");
duke@1 2102 }
duke@1 2103 method()->print_short_name();
duke@1 2104 if (is_osr_parse()) {
duke@1 2105 tty->print(" @ %d", osr_bci());
duke@1 2106 }
duke@1 2107 tty->print(" (%d bytes)",method()->code_size());
duke@1 2108 if (ilt->count_inlines()) {
duke@1 2109 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(),
duke@1 2110 ilt->count_inline_bcs());
duke@1 2111 }
duke@1 2112 tty->cr();
duke@1 2113 }
duke@1 2114 }
duke@1 2115 if (PrintOpto && (depth() == 1 || PrintOptoInlining)) {
duke@1 2116 // Print that we succeeded; suppress this message on the first osr parse.
duke@1 2117
duke@1 2118 if (method()->is_synchronized()) tty->print("s");
duke@1 2119 if (method()->has_exception_handlers()) tty->print("!");
duke@1 2120 // Check this is not the final compiled version
duke@1 2121 if (C->trap_can_recompile() && depth() == 1) {
duke@1 2122 tty->print("-");
duke@1 2123 } else {
duke@1 2124 tty->print(" ");
duke@1 2125 }
duke@1 2126 if( depth() != 1 ) { tty->print(" "); } // missing compile count
duke@1 2127 for (int i = 1; i < depth(); ++i) { tty->print(" "); }
duke@1 2128 method()->print_short_name();
duke@1 2129 if (is_osr_parse()) {
duke@1 2130 tty->print(" @ %d", osr_bci());
duke@1 2131 }
duke@1 2132 if (ilt->caller_bci() != -1) {
duke@1 2133 tty->print(" @ %d", ilt->caller_bci());
duke@1 2134 }
duke@1 2135 tty->print(" (%d bytes)",method()->code_size());
duke@1 2136 if (ilt->count_inlines()) {
duke@1 2137 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(),
duke@1 2138 ilt->count_inline_bcs());
duke@1 2139 }
duke@1 2140 tty->cr();
duke@1 2141 }
duke@1 2142 }
duke@1 2143
duke@1 2144
duke@1 2145 //------------------------------dump-------------------------------------------
duke@1 2146 // Dump information associated with the bytecodes of current _method
duke@1 2147 void Parse::dump() {
duke@1 2148 if( method() != NULL ) {
duke@1 2149 // Iterate over bytecodes
duke@1 2150 ciBytecodeStream iter(method());
duke@1 2151 for( Bytecodes::Code bc = iter.next(); bc != ciBytecodeStream::EOBC() ; bc = iter.next() ) {
duke@1 2152 dump_bci( iter.cur_bci() );
duke@1 2153 tty->cr();
duke@1 2154 }
duke@1 2155 }
duke@1 2156 }
duke@1 2157
duke@1 2158 // Dump information associated with a byte code index, 'bci'
duke@1 2159 void Parse::dump_bci(int bci) {
duke@1 2160 // Output info on merge-points, cloning, and within _jsr..._ret
duke@1 2161 // NYI
duke@1 2162 tty->print(" bci:%d", bci);
duke@1 2163 }
duke@1 2164
duke@1 2165 #endif