annotate src/share/vm/opto/parse1.cpp @ 1070:87b2fdd4bf98

6892079: live value must not be garbage failure after fix for 6854812 Reviewed-by: kvn
author never
date Wed, 11 Nov 2009 23:39:17 -0800
parents 3a2aa26bdc58
children
rev   line source
duke@0 1 /*
xdono@844 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved.
duke@0 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@0 4 *
duke@0 5 * This code is free software; you can redistribute it and/or modify it
duke@0 6 * under the terms of the GNU General Public License version 2 only, as
duke@0 7 * published by the Free Software Foundation.
duke@0 8 *
duke@0 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@0 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@0 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@0 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@0 13 * accompanied this code).
duke@0 14 *
duke@0 15 * You should have received a copy of the GNU General Public License version
duke@0 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@0 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@0 18 *
duke@0 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@0 20 * CA 95054 USA or visit www.sun.com if you need additional information or
duke@0 21 * have any questions.
duke@0 22 *
duke@0 23 */
duke@0 24
duke@0 25 #include "incls/_precompiled.incl"
duke@0 26 #include "incls/_parse1.cpp.incl"
duke@0 27
duke@0 28 // Static array so we can figure out which bytecodes stop us from compiling
duke@0 29 // the most. Some of the non-static variables are needed in bytecodeInfo.cpp
duke@0 30 // and eventually should be encapsulated in a proper class (gri 8/18/98).
duke@0 31
never@367 32 int nodes_created = 0;
never@367 33 int methods_parsed = 0;
never@367 34 int methods_seen = 0;
never@367 35 int blocks_parsed = 0;
never@367 36 int blocks_seen = 0;
duke@0 37
never@367 38 int explicit_null_checks_inserted = 0;
never@367 39 int explicit_null_checks_elided = 0;
duke@0 40 int all_null_checks_found = 0, implicit_null_checks = 0;
duke@0 41 int implicit_null_throws = 0;
duke@0 42
duke@0 43 int reclaim_idx = 0;
duke@0 44 int reclaim_in = 0;
duke@0 45 int reclaim_node = 0;
duke@0 46
duke@0 47 #ifndef PRODUCT
duke@0 48 bool Parse::BytecodeParseHistogram::_initialized = false;
duke@0 49 uint Parse::BytecodeParseHistogram::_bytecodes_parsed [Bytecodes::number_of_codes];
duke@0 50 uint Parse::BytecodeParseHistogram::_nodes_constructed[Bytecodes::number_of_codes];
duke@0 51 uint Parse::BytecodeParseHistogram::_nodes_transformed[Bytecodes::number_of_codes];
duke@0 52 uint Parse::BytecodeParseHistogram::_new_values [Bytecodes::number_of_codes];
duke@0 53 #endif
duke@0 54
duke@0 55 //------------------------------print_statistics-------------------------------
duke@0 56 #ifndef PRODUCT
duke@0 57 void Parse::print_statistics() {
duke@0 58 tty->print_cr("--- Compiler Statistics ---");
duke@0 59 tty->print("Methods seen: %d Methods parsed: %d", methods_seen, methods_parsed);
duke@0 60 tty->print(" Nodes created: %d", nodes_created);
duke@0 61 tty->cr();
duke@0 62 if (methods_seen != methods_parsed)
duke@0 63 tty->print_cr("Reasons for parse failures (NOT cumulative):");
never@367 64 tty->print_cr("Blocks parsed: %d Blocks seen: %d", blocks_parsed, blocks_seen);
duke@0 65
duke@0 66 if( explicit_null_checks_inserted )
duke@0 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@0 68 if( all_null_checks_found )
duke@0 69 tty->print_cr("%d made implicit (%2d%%)", implicit_null_checks,
duke@0 70 (100*implicit_null_checks)/all_null_checks_found);
duke@0 71 if( implicit_null_throws )
duke@0 72 tty->print_cr("%d implicit null exceptions at runtime",
duke@0 73 implicit_null_throws);
duke@0 74
duke@0 75 if( PrintParseStatistics && BytecodeParseHistogram::initialized() ) {
duke@0 76 BytecodeParseHistogram::print();
duke@0 77 }
duke@0 78 }
duke@0 79 #endif
duke@0 80
duke@0 81 //------------------------------ON STACK REPLACEMENT---------------------------
duke@0 82
duke@0 83 // Construct a node which can be used to get incoming state for
duke@0 84 // on stack replacement.
duke@0 85 Node *Parse::fetch_interpreter_state(int index,
duke@0 86 BasicType bt,
duke@0 87 Node *local_addrs,
duke@0 88 Node *local_addrs_base) {
duke@0 89 Node *mem = memory(Compile::AliasIdxRaw);
duke@0 90 Node *adr = basic_plus_adr( local_addrs_base, local_addrs, -index*wordSize );
duke@0 91
duke@0 92 // Very similar to LoadNode::make, except we handle un-aligned longs and
duke@0 93 // doubles on Sparc. Intel can handle them just fine directly.
duke@0 94 Node *l;
duke@0 95 switch( bt ) { // Signature is flattened
duke@0 96 case T_INT: l = new (C, 3) LoadINode( 0, mem, adr, TypeRawPtr::BOTTOM ); break;
duke@0 97 case T_FLOAT: l = new (C, 3) LoadFNode( 0, mem, adr, TypeRawPtr::BOTTOM ); break;
never@684 98 case T_ADDRESS: l = new (C, 3) LoadPNode( 0, mem, adr, TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM ); break;
duke@0 99 case T_OBJECT: l = new (C, 3) LoadPNode( 0, mem, adr, TypeRawPtr::BOTTOM, TypeInstPtr::BOTTOM ); break;
duke@0 100 case T_LONG:
duke@0 101 case T_DOUBLE: {
duke@0 102 // Since arguments are in reverse order, the argument address 'adr'
duke@0 103 // refers to the back half of the long/double. Recompute adr.
duke@0 104 adr = basic_plus_adr( local_addrs_base, local_addrs, -(index+1)*wordSize );
duke@0 105 if( Matcher::misaligned_doubles_ok ) {
duke@0 106 l = (bt == T_DOUBLE)
duke@0 107 ? (Node*)new (C, 3) LoadDNode( 0, mem, adr, TypeRawPtr::BOTTOM )
duke@0 108 : (Node*)new (C, 3) LoadLNode( 0, mem, adr, TypeRawPtr::BOTTOM );
duke@0 109 } else {
duke@0 110 l = (bt == T_DOUBLE)
duke@0 111 ? (Node*)new (C, 3) LoadD_unalignedNode( 0, mem, adr, TypeRawPtr::BOTTOM )
duke@0 112 : (Node*)new (C, 3) LoadL_unalignedNode( 0, mem, adr, TypeRawPtr::BOTTOM );
duke@0 113 }
duke@0 114 break;
duke@0 115 }
duke@0 116 default: ShouldNotReachHere();
duke@0 117 }
duke@0 118 return _gvn.transform(l);
duke@0 119 }
duke@0 120
duke@0 121 // Helper routine to prevent the interpreter from handing
duke@0 122 // unexpected typestate to an OSR method.
duke@0 123 // The Node l is a value newly dug out of the interpreter frame.
duke@0 124 // The type is the type predicted by ciTypeFlow. Note that it is
duke@0 125 // not a general type, but can only come from Type::get_typeflow_type.
duke@0 126 // The safepoint is a map which will feed an uncommon trap.
duke@0 127 Node* Parse::check_interpreter_type(Node* l, const Type* type,
duke@0 128 SafePointNode* &bad_type_exit) {
duke@0 129
duke@0 130 const TypeOopPtr* tp = type->isa_oopptr();
duke@0 131
duke@0 132 // TypeFlow may assert null-ness if a type appears unloaded.
duke@0 133 if (type == TypePtr::NULL_PTR ||
duke@0 134 (tp != NULL && !tp->klass()->is_loaded())) {
duke@0 135 // Value must be null, not a real oop.
duke@0 136 Node* chk = _gvn.transform( new (C, 3) CmpPNode(l, null()) );
duke@0 137 Node* tst = _gvn.transform( new (C, 2) BoolNode(chk, BoolTest::eq) );
duke@0 138 IfNode* iff = create_and_map_if(control(), tst, PROB_MAX, COUNT_UNKNOWN);
duke@0 139 set_control(_gvn.transform( new (C, 1) IfTrueNode(iff) ));
duke@0 140 Node* bad_type = _gvn.transform( new (C, 1) IfFalseNode(iff) );
duke@0 141 bad_type_exit->control()->add_req(bad_type);
duke@0 142 l = null();
duke@0 143 }
duke@0 144
duke@0 145 // Typeflow can also cut off paths from the CFG, based on
duke@0 146 // types which appear unloaded, or call sites which appear unlinked.
duke@0 147 // When paths are cut off, values at later merge points can rise
duke@0 148 // toward more specific classes. Make sure these specific classes
duke@0 149 // are still in effect.
duke@0 150 if (tp != NULL && tp->klass() != C->env()->Object_klass()) {
duke@0 151 // TypeFlow asserted a specific object type. Value must have that type.
duke@0 152 Node* bad_type_ctrl = NULL;
duke@0 153 l = gen_checkcast(l, makecon(TypeKlassPtr::make(tp->klass())), &bad_type_ctrl);
duke@0 154 bad_type_exit->control()->add_req(bad_type_ctrl);
duke@0 155 }
duke@0 156
duke@0 157 BasicType bt_l = _gvn.type(l)->basic_type();
duke@0 158 BasicType bt_t = type->basic_type();
duke@0 159 assert(_gvn.type(l)->higher_equal(type), "must constrain OSR typestate");
duke@0 160 return l;
duke@0 161 }
duke@0 162
duke@0 163 // Helper routine which sets up elements of the initial parser map when
duke@0 164 // performing a parse for on stack replacement. Add values into map.
duke@0 165 // The only parameter contains the address of a interpreter arguments.
duke@0 166 void Parse::load_interpreter_state(Node* osr_buf) {
duke@0 167 int index;
duke@0 168 int max_locals = jvms()->loc_size();
duke@0 169 int max_stack = jvms()->stk_size();
duke@0 170
duke@0 171
duke@0 172 // Mismatch between method and jvms can occur since map briefly held
duke@0 173 // an OSR entry state (which takes up one RawPtr word).
duke@0 174 assert(max_locals == method()->max_locals(), "sanity");
duke@0 175 assert(max_stack >= method()->max_stack(), "sanity");
duke@0 176 assert((int)jvms()->endoff() == TypeFunc::Parms + max_locals + max_stack, "sanity");
duke@0 177 assert((int)jvms()->endoff() == (int)map()->req(), "sanity");
duke@0 178
duke@0 179 // Find the start block.
duke@0 180 Block* osr_block = start_block();
duke@0 181 assert(osr_block->start() == osr_bci(), "sanity");
duke@0 182
duke@0 183 // Set initial BCI.
duke@0 184 set_parse_bci(osr_block->start());
duke@0 185
duke@0 186 // Set initial stack depth.
duke@0 187 set_sp(osr_block->start_sp());
duke@0 188
duke@0 189 // Check bailouts. We currently do not perform on stack replacement
duke@0 190 // of loops in catch blocks or loops which branch with a non-empty stack.
duke@0 191 if (sp() != 0) {
duke@0 192 C->record_method_not_compilable("OSR starts with non-empty stack");
duke@0 193 return;
duke@0 194 }
duke@0 195 // Do not OSR inside finally clauses:
duke@0 196 if (osr_block->has_trap_at(osr_block->start())) {
duke@0 197 C->record_method_not_compilable("OSR starts with an immediate trap");
duke@0 198 return;
duke@0 199 }
duke@0 200
duke@0 201 // Commute monitors from interpreter frame to compiler frame.
duke@0 202 assert(jvms()->monitor_depth() == 0, "should be no active locks at beginning of osr");
duke@0 203 int mcnt = osr_block->flow()->monitor_count();
duke@0 204 Node *monitors_addr = basic_plus_adr(osr_buf, osr_buf, (max_locals+mcnt*2-1)*wordSize);
duke@0 205 for (index = 0; index < mcnt; index++) {
duke@0 206 // Make a BoxLockNode for the monitor.
duke@0 207 Node *box = _gvn.transform(new (C, 1) BoxLockNode(next_monitor()));
duke@0 208
duke@0 209
duke@0 210 // Displaced headers and locked objects are interleaved in the
duke@0 211 // temp OSR buffer. We only copy the locked objects out here.
duke@0 212 // Fetch the locked object from the OSR temp buffer and copy to our fastlock node.
duke@0 213 Node *lock_object = fetch_interpreter_state(index*2, T_OBJECT, monitors_addr, osr_buf);
duke@0 214 // Try and copy the displaced header to the BoxNode
duke@0 215 Node *displaced_hdr = fetch_interpreter_state((index*2) + 1, T_ADDRESS, monitors_addr, osr_buf);
duke@0 216
duke@0 217
duke@0 218 store_to_memory(control(), box, displaced_hdr, T_ADDRESS, Compile::AliasIdxRaw);
duke@0 219
duke@0 220 // Build a bogus FastLockNode (no code will be generated) and push the
duke@0 221 // monitor into our debug info.
duke@0 222 const FastLockNode *flock = _gvn.transform(new (C, 3) FastLockNode( 0, lock_object, box ))->as_FastLock();
duke@0 223 map()->push_monitor(flock);
duke@0 224
duke@0 225 // If the lock is our method synchronization lock, tuck it away in
duke@0 226 // _sync_lock for return and rethrow exit paths.
duke@0 227 if (index == 0 && method()->is_synchronized()) {
duke@0 228 _synch_lock = flock;
duke@0 229 }
duke@0 230 }
duke@0 231
never@991 232 // Use the raw liveness computation to make sure that unexpected
never@991 233 // values don't propagate into the OSR frame.
never@1070 234 MethodLivenessResult live_locals = method()->liveness_at_bci(osr_bci());
duke@0 235 if (!live_locals.is_valid()) {
duke@0 236 // Degenerate or breakpointed method.
duke@0 237 C->record_method_not_compilable("OSR in empty or breakpointed method");
duke@0 238 return;
duke@0 239 }
never@1070 240 MethodLivenessResult raw_live_locals = method()->raw_liveness_at_bci(osr_bci());
duke@0 241
duke@0 242 // Extract the needed locals from the interpreter frame.
duke@0 243 Node *locals_addr = basic_plus_adr(osr_buf, osr_buf, (max_locals-1)*wordSize);
duke@0 244
duke@0 245 // find all the locals that the interpreter thinks contain live oops
duke@0 246 const BitMap live_oops = method()->live_local_oops_at_bci(osr_bci());
duke@0 247 for (index = 0; index < max_locals; index++) {
duke@0 248
duke@0 249 if (!live_locals.at(index)) {
duke@0 250 continue;
duke@0 251 }
duke@0 252
duke@0 253 const Type *type = osr_block->local_type_at(index);
duke@0 254
duke@0 255 if (type->isa_oopptr() != NULL) {
duke@0 256
duke@0 257 // 6403625: Verify that the interpreter oopMap thinks that the oop is live
duke@0 258 // else we might load a stale oop if the MethodLiveness disagrees with the
duke@0 259 // result of the interpreter. If the interpreter says it is dead we agree
duke@0 260 // by making the value go to top.
duke@0 261 //
duke@0 262
duke@0 263 if (!live_oops.at(index)) {
duke@0 264 if (C->log() != NULL) {
duke@0 265 C->log()->elem("OSR_mismatch local_index='%d'",index);
duke@0 266 }
duke@0 267 set_local(index, null());
duke@0 268 // and ignore it for the loads
duke@0 269 continue;
duke@0 270 }
duke@0 271 }
duke@0 272
duke@0 273 // Filter out TOP, HALF, and BOTTOM. (Cf. ensure_phi.)
duke@0 274 if (type == Type::TOP || type == Type::HALF) {
duke@0 275 continue;
duke@0 276 }
duke@0 277 // If the type falls to bottom, then this must be a local that
duke@0 278 // is mixing ints and oops or some such. Forcing it to top
duke@0 279 // makes it go dead.
duke@0 280 if (type == Type::BOTTOM) {
duke@0 281 continue;
duke@0 282 }
duke@0 283 // Construct code to access the appropriate local.
duke@0 284 Node *value = fetch_interpreter_state(index, type->basic_type(), locals_addr, osr_buf);
duke@0 285 set_local(index, value);
duke@0 286 }
duke@0 287
duke@0 288 // Extract the needed stack entries from the interpreter frame.
duke@0 289 for (index = 0; index < sp(); index++) {
duke@0 290 const Type *type = osr_block->stack_type_at(index);
duke@0 291 if (type != Type::TOP) {
duke@0 292 // Currently the compiler bails out when attempting to on stack replace
duke@0 293 // at a bci with a non-empty stack. We should not reach here.
duke@0 294 ShouldNotReachHere();
duke@0 295 }
duke@0 296 }
duke@0 297
duke@0 298 // End the OSR migration
duke@0 299 make_runtime_call(RC_LEAF, OptoRuntime::osr_end_Type(),
duke@0 300 CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_end),
duke@0 301 "OSR_migration_end", TypeRawPtr::BOTTOM,
duke@0 302 osr_buf);
duke@0 303
duke@0 304 // Now that the interpreter state is loaded, make sure it will match
duke@0 305 // at execution time what the compiler is expecting now:
duke@0 306 SafePointNode* bad_type_exit = clone_map();
duke@0 307 bad_type_exit->set_control(new (C, 1) RegionNode(1));
duke@0 308
duke@0 309 for (index = 0; index < max_locals; index++) {
duke@0 310 if (stopped()) break;
duke@0 311 Node* l = local(index);
duke@0 312 if (l->is_top()) continue; // nothing here
duke@0 313 const Type *type = osr_block->local_type_at(index);
duke@0 314 if (type->isa_oopptr() != NULL) {
duke@0 315 if (!live_oops.at(index)) {
duke@0 316 // skip type check for dead oops
duke@0 317 continue;
duke@0 318 }
duke@0 319 }
never@1070 320 if (type->basic_type() == T_ADDRESS && !raw_live_locals.at(index)) {
never@1070 321 // Skip type check for dead address locals
never@1070 322 continue;
never@1070 323 }
duke@0 324 set_local(index, check_interpreter_type(l, type, bad_type_exit));
duke@0 325 }
duke@0 326
duke@0 327 for (index = 0; index < sp(); index++) {
duke@0 328 if (stopped()) break;
duke@0 329 Node* l = stack(index);
duke@0 330 if (l->is_top()) continue; // nothing here
duke@0 331 const Type *type = osr_block->stack_type_at(index);
duke@0 332 set_stack(index, check_interpreter_type(l, type, bad_type_exit));
duke@0 333 }
duke@0 334
duke@0 335 if (bad_type_exit->control()->req() > 1) {
duke@0 336 // Build an uncommon trap here, if any inputs can be unexpected.
duke@0 337 bad_type_exit->set_control(_gvn.transform( bad_type_exit->control() ));
duke@0 338 record_for_igvn(bad_type_exit->control());
duke@0 339 SafePointNode* types_are_good = map();
duke@0 340 set_map(bad_type_exit);
duke@0 341 // The unexpected type happens because a new edge is active
duke@0 342 // in the CFG, which typeflow had previously ignored.
duke@0 343 // E.g., Object x = coldAtFirst() && notReached()? "str": new Integer(123).
duke@0 344 // This x will be typed as Integer if notReached is not yet linked.
duke@0 345 uncommon_trap(Deoptimization::Reason_unreached,
duke@0 346 Deoptimization::Action_reinterpret);
duke@0 347 set_map(types_are_good);
duke@0 348 }
duke@0 349 }
duke@0 350
duke@0 351 //------------------------------Parse------------------------------------------
duke@0 352 // Main parser constructor.
duke@0 353 Parse::Parse(JVMState* caller, ciMethod* parse_method, float expected_uses)
duke@0 354 : _exits(caller)
duke@0 355 {
duke@0 356 // Init some variables
duke@0 357 _caller = caller;
duke@0 358 _method = parse_method;
duke@0 359 _expected_uses = expected_uses;
duke@0 360 _depth = 1 + (caller->has_method() ? caller->depth() : 0);
duke@0 361 _wrote_final = false;
duke@0 362 _entry_bci = InvocationEntryBci;
duke@0 363 _tf = NULL;
duke@0 364 _block = NULL;
duke@0 365 debug_only(_block_count = -1);
duke@0 366 debug_only(_blocks = (Block*)-1);
duke@0 367 #ifndef PRODUCT
duke@0 368 if (PrintCompilation || PrintOpto) {
duke@0 369 // Make sure I have an inline tree, so I can print messages about it.
duke@0 370 JVMState* ilt_caller = is_osr_parse() ? caller->caller() : caller;
duke@0 371 InlineTree::find_subtree_from_root(C->ilt(), ilt_caller, parse_method, true);
duke@0 372 }
duke@0 373 _max_switch_depth = 0;
duke@0 374 _est_switch_depth = 0;
duke@0 375 #endif
duke@0 376
duke@0 377 _tf = TypeFunc::make(method());
duke@0 378 _iter.reset_to_method(method());
duke@0 379 _flow = method()->get_flow_analysis();
duke@0 380 if (_flow->failing()) {
duke@0 381 C->record_method_not_compilable_all_tiers(_flow->failure_reason());
duke@0 382 }
duke@0 383
never@367 384 #ifndef PRODUCT
never@367 385 if (_flow->has_irreducible_entry()) {
never@367 386 C->set_parsed_irreducible_loop(true);
never@367 387 }
never@367 388 #endif
never@367 389
duke@0 390 if (_expected_uses <= 0) {
duke@0 391 _prof_factor = 1;
duke@0 392 } else {
duke@0 393 float prof_total = parse_method->interpreter_invocation_count();
duke@0 394 if (prof_total <= _expected_uses) {
duke@0 395 _prof_factor = 1;
duke@0 396 } else {
duke@0 397 _prof_factor = _expected_uses / prof_total;
duke@0 398 }
duke@0 399 }
duke@0 400
duke@0 401 CompileLog* log = C->log();
duke@0 402 if (log != NULL) {
duke@0 403 log->begin_head("parse method='%d' uses='%g'",
duke@0 404 log->identify(parse_method), expected_uses);
duke@0 405 if (depth() == 1 && C->is_osr_compilation()) {
duke@0 406 log->print(" osr_bci='%d'", C->entry_bci());
duke@0 407 }
duke@0 408 log->stamp();
duke@0 409 log->end_head();
duke@0 410 }
duke@0 411
duke@0 412 // Accumulate deoptimization counts.
duke@0 413 // (The range_check and store_check counts are checked elsewhere.)
duke@0 414 ciMethodData* md = method()->method_data();
duke@0 415 for (uint reason = 0; reason < md->trap_reason_limit(); reason++) {
duke@0 416 uint md_count = md->trap_count(reason);
duke@0 417 if (md_count != 0) {
duke@0 418 if (md_count == md->trap_count_limit())
duke@0 419 md_count += md->overflow_trap_count();
duke@0 420 uint total_count = C->trap_count(reason);
duke@0 421 uint old_count = total_count;
duke@0 422 total_count += md_count;
duke@0 423 // Saturate the add if it overflows.
duke@0 424 if (total_count < old_count || total_count < md_count)
duke@0 425 total_count = (uint)-1;
duke@0 426 C->set_trap_count(reason, total_count);
duke@0 427 if (log != NULL)
duke@0 428 log->elem("observe trap='%s' count='%d' total='%d'",
duke@0 429 Deoptimization::trap_reason_name(reason),
duke@0 430 md_count, total_count);
duke@0 431 }
duke@0 432 }
duke@0 433 // Accumulate total sum of decompilations, also.
duke@0 434 C->set_decompile_count(C->decompile_count() + md->decompile_count());
duke@0 435
duke@0 436 _count_invocations = C->do_count_invocations();
duke@0 437 _method_data_update = C->do_method_data_update();
duke@0 438
duke@0 439 if (log != NULL && method()->has_exception_handlers()) {
duke@0 440 log->elem("observe that='has_exception_handlers'");
duke@0 441 }
duke@0 442
duke@0 443 assert(method()->can_be_compiled(), "Can not parse this method, cutout earlier");
duke@0 444 assert(method()->has_balanced_monitors(), "Can not parse unbalanced monitors, cutout earlier");
duke@0 445
duke@0 446 // Always register dependence if JVMTI is enabled, because
duke@0 447 // either breakpoint setting or hotswapping of methods may
duke@0 448 // cause deoptimization.
kvn@780 449 if (C->env()->jvmti_can_hotswap_or_post_breakpoint()) {
duke@0 450 C->dependencies()->assert_evol_method(method());
duke@0 451 }
duke@0 452
duke@0 453 methods_seen++;
duke@0 454
duke@0 455 // Do some special top-level things.
duke@0 456 if (depth() == 1 && C->is_osr_compilation()) {
duke@0 457 _entry_bci = C->entry_bci();
duke@0 458 _flow = method()->get_osr_flow_analysis(osr_bci());
duke@0 459 if (_flow->failing()) {
duke@0 460 C->record_method_not_compilable(_flow->failure_reason());
duke@0 461 #ifndef PRODUCT
duke@0 462 if (PrintOpto && (Verbose || WizardMode)) {
duke@0 463 tty->print_cr("OSR @%d type flow bailout: %s", _entry_bci, _flow->failure_reason());
duke@0 464 if (Verbose) {
duke@0 465 method()->print_oop();
duke@0 466 method()->print_codes();
duke@0 467 _flow->print();
duke@0 468 }
duke@0 469 }
duke@0 470 #endif
duke@0 471 }
duke@0 472 _tf = C->tf(); // the OSR entry type is different
duke@0 473 }
duke@0 474
duke@0 475 #ifdef ASSERT
duke@0 476 if (depth() == 1) {
duke@0 477 assert(C->is_osr_compilation() == this->is_osr_parse(), "OSR in sync");
duke@0 478 if (C->tf() != tf()) {
duke@0 479 MutexLockerEx ml(Compile_lock, Mutex::_no_safepoint_check_flag);
duke@0 480 assert(C->env()->system_dictionary_modification_counter_changed(),
duke@0 481 "Must invalidate if TypeFuncs differ");
duke@0 482 }
duke@0 483 } else {
duke@0 484 assert(!this->is_osr_parse(), "no recursive OSR");
duke@0 485 }
duke@0 486 #endif
duke@0 487
duke@0 488 methods_parsed++;
duke@0 489 #ifndef PRODUCT
duke@0 490 // add method size here to guarantee that inlined methods are added too
duke@0 491 if (TimeCompiler)
duke@0 492 _total_bytes_compiled += method()->code_size();
duke@0 493
duke@0 494 show_parse_info();
duke@0 495 #endif
duke@0 496
duke@0 497 if (failing()) {
duke@0 498 if (log) log->done("parse");
duke@0 499 return;
duke@0 500 }
duke@0 501
duke@0 502 gvn().set_type(root(), root()->bottom_type());
duke@0 503 gvn().transform(top());
duke@0 504
duke@0 505 // Import the results of the ciTypeFlow.
duke@0 506 init_blocks();
duke@0 507
duke@0 508 // Merge point for all normal exits
duke@0 509 build_exits();
duke@0 510
duke@0 511 // Setup the initial JVM state map.
duke@0 512 SafePointNode* entry_map = create_entry_map();
duke@0 513
duke@0 514 // Check for bailouts during map initialization
duke@0 515 if (failing() || entry_map == NULL) {
duke@0 516 if (log) log->done("parse");
duke@0 517 return;
duke@0 518 }
duke@0 519
duke@0 520 Node_Notes* caller_nn = C->default_node_notes();
duke@0 521 // Collect debug info for inlined calls unless -XX:-DebugInlinedCalls.
duke@0 522 if (DebugInlinedCalls || depth() == 1) {
duke@0 523 C->set_default_node_notes(make_node_notes(caller_nn));
duke@0 524 }
duke@0 525
duke@0 526 if (is_osr_parse()) {
duke@0 527 Node* osr_buf = entry_map->in(TypeFunc::Parms+0);
duke@0 528 entry_map->set_req(TypeFunc::Parms+0, top());
duke@0 529 set_map(entry_map);
duke@0 530 load_interpreter_state(osr_buf);
duke@0 531 } else {
duke@0 532 set_map(entry_map);
duke@0 533 do_method_entry();
duke@0 534 }
duke@0 535
duke@0 536 // Check for bailouts during method entry.
duke@0 537 if (failing()) {
duke@0 538 if (log) log->done("parse");
duke@0 539 C->set_default_node_notes(caller_nn);
duke@0 540 return;
duke@0 541 }
duke@0 542
duke@0 543 entry_map = map(); // capture any changes performed by method setup code
duke@0 544 assert(jvms()->endoff() == map()->req(), "map matches JVMS layout");
duke@0 545
duke@0 546 // We begin parsing as if we have just encountered a jump to the
duke@0 547 // method entry.
duke@0 548 Block* entry_block = start_block();
duke@0 549 assert(entry_block->start() == (is_osr_parse() ? osr_bci() : 0), "");
duke@0 550 set_map_clone(entry_map);
duke@0 551 merge_common(entry_block, entry_block->next_path_num());
duke@0 552
duke@0 553 #ifndef PRODUCT
duke@0 554 BytecodeParseHistogram *parse_histogram_obj = new (C->env()->arena()) BytecodeParseHistogram(this, C);
duke@0 555 set_parse_histogram( parse_histogram_obj );
duke@0 556 #endif
duke@0 557
duke@0 558 // Parse all the basic blocks.
duke@0 559 do_all_blocks();
duke@0 560
duke@0 561 C->set_default_node_notes(caller_nn);
duke@0 562
duke@0 563 // Check for bailouts during conversion to graph
duke@0 564 if (failing()) {
duke@0 565 if (log) log->done("parse");
duke@0 566 return;
duke@0 567 }
duke@0 568
duke@0 569 // Fix up all exiting control flow.
duke@0 570 set_map(entry_map);
duke@0 571 do_exits();
duke@0 572
duke@0 573 if (log) log->done("parse nodes='%d' memory='%d'",
duke@0 574 C->unique(), C->node_arena()->used());
duke@0 575 }
duke@0 576
duke@0 577 //---------------------------do_all_blocks-------------------------------------
duke@0 578 void Parse::do_all_blocks() {
never@367 579 bool has_irreducible = flow()->has_irreducible_entry();
duke@0 580
never@367 581 // Walk over all blocks in Reverse Post-Order.
never@367 582 while (true) {
never@367 583 bool progress = false;
never@367 584 for (int rpo = 0; rpo < block_count(); rpo++) {
never@367 585 Block* block = rpo_at(rpo);
duke@0 586
never@367 587 if (block->is_parsed()) continue;
duke@0 588
never@367 589 if (!block->is_merged()) {
never@367 590 // Dead block, no state reaches this block
never@367 591 continue;
never@367 592 }
duke@0 593
never@367 594 // Prepare to parse this block.
never@367 595 load_state_from(block);
duke@0 596
never@367 597 if (stopped()) {
never@367 598 // Block is dead.
never@367 599 continue;
duke@0 600 }
never@367 601
never@367 602 blocks_parsed++;
never@367 603
never@367 604 progress = true;
never@367 605 if (block->is_loop_head() || block->is_handler() || has_irreducible && !block->is_ready()) {
never@367 606 // Not all preds have been parsed. We must build phis everywhere.
never@367 607 // (Note that dead locals do not get phis built, ever.)
never@367 608 ensure_phis_everywhere();
never@367 609
never@367 610 // Leave behind an undisturbed copy of the map, for future merges.
never@367 611 set_map(clone_map());
never@367 612 }
never@367 613
never@367 614 if (control()->is_Region() && !block->is_loop_head() && !has_irreducible && !block->is_handler()) {
never@367 615 // In the absence of irreducible loops, the Region and Phis
never@367 616 // associated with a merge that doesn't involve a backedge can
twisti@605 617 // be simplified now since the RPO parsing order guarantees
never@367 618 // that any path which was supposed to reach here has already
never@367 619 // been parsed or must be dead.
never@367 620 Node* c = control();
never@367 621 Node* result = _gvn.transform_no_reclaim(control());
never@367 622 if (c != result && TraceOptoParse) {
never@367 623 tty->print_cr("Block #%d replace %d with %d", block->rpo(), c->_idx, result->_idx);
never@367 624 }
never@367 625 if (result != top()) {
never@367 626 record_for_igvn(result);
never@367 627 }
never@367 628 }
never@367 629
never@367 630 // Parse the block.
never@367 631 do_one_block();
never@367 632
never@367 633 // Check for bailouts.
never@367 634 if (failing()) return;
never@367 635 }
never@367 636
never@367 637 // with irreducible loops multiple passes might be necessary to parse everything
never@367 638 if (!has_irreducible || !progress) {
duke@0 639 break;
duke@0 640 }
never@367 641 }
duke@0 642
never@367 643 blocks_seen += block_count();
duke@0 644
duke@0 645 #ifndef PRODUCT
duke@0 646 // Make sure there are no half-processed blocks remaining.
duke@0 647 // Every remaining unprocessed block is dead and may be ignored now.
never@367 648 for (int rpo = 0; rpo < block_count(); rpo++) {
never@367 649 Block* block = rpo_at(rpo);
duke@0 650 if (!block->is_parsed()) {
duke@0 651 if (TraceOptoParse) {
never@367 652 tty->print_cr("Skipped dead block %d at bci:%d", rpo, block->start());
duke@0 653 }
never@367 654 assert(!block->is_merged(), "no half-processed blocks");
duke@0 655 }
duke@0 656 }
duke@0 657 #endif
duke@0 658 }
duke@0 659
duke@0 660 //-------------------------------build_exits----------------------------------
duke@0 661 // Build normal and exceptional exit merge points.
duke@0 662 void Parse::build_exits() {
duke@0 663 // make a clone of caller to prevent sharing of side-effects
duke@0 664 _exits.set_map(_exits.clone_map());
duke@0 665 _exits.clean_stack(_exits.sp());
duke@0 666 _exits.sync_jvms();
duke@0 667
duke@0 668 RegionNode* region = new (C, 1) RegionNode(1);
duke@0 669 record_for_igvn(region);
duke@0 670 gvn().set_type_bottom(region);
duke@0 671 _exits.set_control(region);
duke@0 672
duke@0 673 // Note: iophi and memphi are not transformed until do_exits.
duke@0 674 Node* iophi = new (C, region->req()) PhiNode(region, Type::ABIO);
duke@0 675 Node* memphi = new (C, region->req()) PhiNode(region, Type::MEMORY, TypePtr::BOTTOM);
duke@0 676 _exits.set_i_o(iophi);
duke@0 677 _exits.set_all_memory(memphi);
duke@0 678
duke@0 679 // Add a return value to the exit state. (Do not push it yet.)
duke@0 680 if (tf()->range()->cnt() > TypeFunc::Parms) {
duke@0 681 const Type* ret_type = tf()->range()->field_at(TypeFunc::Parms);
duke@0 682 // Don't "bind" an unloaded return klass to the ret_phi. If the klass
duke@0 683 // becomes loaded during the subsequent parsing, the loaded and unloaded
duke@0 684 // types will not join when we transform and push in do_exits().
duke@0 685 const TypeOopPtr* ret_oop_type = ret_type->isa_oopptr();
duke@0 686 if (ret_oop_type && !ret_oop_type->klass()->is_loaded()) {
duke@0 687 ret_type = TypeOopPtr::BOTTOM;
duke@0 688 }
duke@0 689 int ret_size = type2size[ret_type->basic_type()];
duke@0 690 Node* ret_phi = new (C, region->req()) PhiNode(region, ret_type);
duke@0 691 _exits.ensure_stack(ret_size);
duke@0 692 assert((int)(tf()->range()->cnt() - TypeFunc::Parms) == ret_size, "good tf range");
duke@0 693 assert(method()->return_type()->size() == ret_size, "tf agrees w/ method");
duke@0 694 _exits.set_argument(0, ret_phi); // here is where the parser finds it
duke@0 695 // Note: ret_phi is not yet pushed, until do_exits.
duke@0 696 }
duke@0 697 }
duke@0 698
duke@0 699
duke@0 700 //----------------------------build_start_state-------------------------------
duke@0 701 // Construct a state which contains only the incoming arguments from an
duke@0 702 // unknown caller. The method & bci will be NULL & InvocationEntryBci.
duke@0 703 JVMState* Compile::build_start_state(StartNode* start, const TypeFunc* tf) {
duke@0 704 int arg_size = tf->domain()->cnt();
duke@0 705 int max_size = MAX2(arg_size, (int)tf->range()->cnt());
duke@0 706 JVMState* jvms = new (this) JVMState(max_size - TypeFunc::Parms);
duke@0 707 SafePointNode* map = new (this, max_size) SafePointNode(max_size, NULL);
duke@0 708 record_for_igvn(map);
duke@0 709 assert(arg_size == TypeFunc::Parms + (is_osr_compilation() ? 1 : method()->arg_size()), "correct arg_size");
duke@0 710 Node_Notes* old_nn = default_node_notes();
duke@0 711 if (old_nn != NULL && has_method()) {
duke@0 712 Node_Notes* entry_nn = old_nn->clone(this);
duke@0 713 JVMState* entry_jvms = new(this) JVMState(method(), old_nn->jvms());
duke@0 714 entry_jvms->set_offsets(0);
duke@0 715 entry_jvms->set_bci(entry_bci());
duke@0 716 entry_nn->set_jvms(entry_jvms);
duke@0 717 set_default_node_notes(entry_nn);
duke@0 718 }
duke@0 719 uint i;
duke@0 720 for (i = 0; i < (uint)arg_size; i++) {
duke@0 721 Node* parm = initial_gvn()->transform(new (this, 1) ParmNode(start, i));
duke@0 722 map->init_req(i, parm);
duke@0 723 // Record all these guys for later GVN.
duke@0 724 record_for_igvn(parm);
duke@0 725 }
duke@0 726 for (; i < map->req(); i++) {
duke@0 727 map->init_req(i, top());
duke@0 728 }
duke@0 729 assert(jvms->argoff() == TypeFunc::Parms, "parser gets arguments here");
duke@0 730 set_default_node_notes(old_nn);
duke@0 731 map->set_jvms(jvms);
duke@0 732 jvms->set_map(map);
duke@0 733 return jvms;
duke@0 734 }
duke@0 735
duke@0 736 //-----------------------------make_node_notes---------------------------------
duke@0 737 Node_Notes* Parse::make_node_notes(Node_Notes* caller_nn) {
duke@0 738 if (caller_nn == NULL) return NULL;
duke@0 739 Node_Notes* nn = caller_nn->clone(C);
duke@0 740 JVMState* caller_jvms = nn->jvms();
duke@0 741 JVMState* jvms = new (C) JVMState(method(), caller_jvms);
duke@0 742 jvms->set_offsets(0);
duke@0 743 jvms->set_bci(_entry_bci);
duke@0 744 nn->set_jvms(jvms);
duke@0 745 return nn;
duke@0 746 }
duke@0 747
duke@0 748
duke@0 749 //--------------------------return_values--------------------------------------
duke@0 750 void Compile::return_values(JVMState* jvms) {
duke@0 751 GraphKit kit(jvms);
duke@0 752 Node* ret = new (this, TypeFunc::Parms) ReturnNode(TypeFunc::Parms,
duke@0 753 kit.control(),
duke@0 754 kit.i_o(),
duke@0 755 kit.reset_memory(),
duke@0 756 kit.frameptr(),
duke@0 757 kit.returnadr());
duke@0 758 // Add zero or 1 return values
duke@0 759 int ret_size = tf()->range()->cnt() - TypeFunc::Parms;
duke@0 760 if (ret_size > 0) {
duke@0 761 kit.inc_sp(-ret_size); // pop the return value(s)
duke@0 762 kit.sync_jvms();
duke@0 763 ret->add_req(kit.argument(0));
duke@0 764 // Note: The second dummy edge is not needed by a ReturnNode.
duke@0 765 }
duke@0 766 // bind it to root
duke@0 767 root()->add_req(ret);
duke@0 768 record_for_igvn(ret);
duke@0 769 initial_gvn()->transform_no_reclaim(ret);
duke@0 770 }
duke@0 771
duke@0 772 //------------------------rethrow_exceptions-----------------------------------
duke@0 773 // Bind all exception states in the list into a single RethrowNode.
duke@0 774 void Compile::rethrow_exceptions(JVMState* jvms) {
duke@0 775 GraphKit kit(jvms);
duke@0 776 if (!kit.has_exceptions()) return; // nothing to generate
duke@0 777 // Load my combined exception state into the kit, with all phis transformed:
duke@0 778 SafePointNode* ex_map = kit.combine_and_pop_all_exception_states();
duke@0 779 Node* ex_oop = kit.use_exception_state(ex_map);
duke@0 780 RethrowNode* exit = new (this, TypeFunc::Parms + 1) RethrowNode(kit.control(),
duke@0 781 kit.i_o(), kit.reset_memory(),
duke@0 782 kit.frameptr(), kit.returnadr(),
duke@0 783 // like a return but with exception input
duke@0 784 ex_oop);
duke@0 785 // bind to root
duke@0 786 root()->add_req(exit);
duke@0 787 record_for_igvn(exit);
duke@0 788 initial_gvn()->transform_no_reclaim(exit);
duke@0 789 }
duke@0 790
duke@0 791 bool Parse::can_rerun_bytecode() {
duke@0 792 switch (bc()) {
duke@0 793 case Bytecodes::_ldc:
duke@0 794 case Bytecodes::_ldc_w:
duke@0 795 case Bytecodes::_ldc2_w:
duke@0 796 case Bytecodes::_getfield:
duke@0 797 case Bytecodes::_putfield:
duke@0 798 case Bytecodes::_getstatic:
duke@0 799 case Bytecodes::_putstatic:
duke@0 800 case Bytecodes::_arraylength:
duke@0 801 case Bytecodes::_baload:
duke@0 802 case Bytecodes::_caload:
duke@0 803 case Bytecodes::_iaload:
duke@0 804 case Bytecodes::_saload:
duke@0 805 case Bytecodes::_faload:
duke@0 806 case Bytecodes::_aaload:
duke@0 807 case Bytecodes::_laload:
duke@0 808 case Bytecodes::_daload:
duke@0 809 case Bytecodes::_bastore:
duke@0 810 case Bytecodes::_castore:
duke@0 811 case Bytecodes::_iastore:
duke@0 812 case Bytecodes::_sastore:
duke@0 813 case Bytecodes::_fastore:
duke@0 814 case Bytecodes::_aastore:
duke@0 815 case Bytecodes::_lastore:
duke@0 816 case Bytecodes::_dastore:
duke@0 817 case Bytecodes::_irem:
duke@0 818 case Bytecodes::_idiv:
duke@0 819 case Bytecodes::_lrem:
duke@0 820 case Bytecodes::_ldiv:
duke@0 821 case Bytecodes::_frem:
duke@0 822 case Bytecodes::_fdiv:
duke@0 823 case Bytecodes::_drem:
duke@0 824 case Bytecodes::_ddiv:
duke@0 825 case Bytecodes::_checkcast:
duke@0 826 case Bytecodes::_instanceof:
duke@0 827 case Bytecodes::_athrow:
duke@0 828 case Bytecodes::_anewarray:
duke@0 829 case Bytecodes::_newarray:
duke@0 830 case Bytecodes::_multianewarray:
duke@0 831 case Bytecodes::_new:
duke@0 832 case Bytecodes::_monitorenter: // can re-run initial null check, only
duke@0 833 case Bytecodes::_return:
duke@0 834 return true;
duke@0 835 break;
duke@0 836
duke@0 837 case Bytecodes::_invokestatic:
jrose@726 838 case Bytecodes::_invokedynamic:
duke@0 839 case Bytecodes::_invokespecial:
duke@0 840 case Bytecodes::_invokevirtual:
duke@0 841 case Bytecodes::_invokeinterface:
duke@0 842 return false;
duke@0 843 break;
duke@0 844
duke@0 845 default:
duke@0 846 assert(false, "unexpected bytecode produced an exception");
duke@0 847 return true;
duke@0 848 }
duke@0 849 }
duke@0 850
duke@0 851 //---------------------------do_exceptions-------------------------------------
duke@0 852 // Process exceptions arising from the current bytecode.
duke@0 853 // Send caught exceptions to the proper handler within this method.
duke@0 854 // Unhandled exceptions feed into _exit.
duke@0 855 void Parse::do_exceptions() {
duke@0 856 if (!has_exceptions()) return;
duke@0 857
duke@0 858 if (failing()) {
duke@0 859 // Pop them all off and throw them away.
duke@0 860 while (pop_exception_state() != NULL) ;
duke@0 861 return;
duke@0 862 }
duke@0 863
duke@0 864 // Make sure we can classify this bytecode if we need to.
duke@0 865 debug_only(can_rerun_bytecode());
duke@0 866
duke@0 867 PreserveJVMState pjvms(this, false);
duke@0 868
duke@0 869 SafePointNode* ex_map;
duke@0 870 while ((ex_map = pop_exception_state()) != NULL) {
duke@0 871 if (!method()->has_exception_handlers()) {
duke@0 872 // Common case: Transfer control outward.
duke@0 873 // Doing it this early allows the exceptions to common up
duke@0 874 // even between adjacent method calls.
duke@0 875 throw_to_exit(ex_map);
duke@0 876 } else {
duke@0 877 // Have to look at the exception first.
duke@0 878 assert(stopped(), "catch_inline_exceptions trashes the map");
duke@0 879 catch_inline_exceptions(ex_map);
duke@0 880 stop_and_kill_map(); // we used up this exception state; kill it
duke@0 881 }
duke@0 882 }
duke@0 883
duke@0 884 // We now return to our regularly scheduled program:
duke@0 885 }
duke@0 886
duke@0 887 //---------------------------throw_to_exit-------------------------------------
duke@0 888 // Merge the given map into an exception exit from this method.
duke@0 889 // The exception exit will handle any unlocking of receiver.
duke@0 890 // The ex_oop must be saved within the ex_map, unlike merge_exception.
duke@0 891 void Parse::throw_to_exit(SafePointNode* ex_map) {
duke@0 892 // Pop the JVMS to (a copy of) the caller.
duke@0 893 GraphKit caller;
duke@0 894 caller.set_map_clone(_caller->map());
duke@0 895 caller.set_bci(_caller->bci());
duke@0 896 caller.set_sp(_caller->sp());
duke@0 897 // Copy out the standard machine state:
duke@0 898 for (uint i = 0; i < TypeFunc::Parms; i++) {
duke@0 899 caller.map()->set_req(i, ex_map->in(i));
duke@0 900 }
duke@0 901 // ...and the exception:
duke@0 902 Node* ex_oop = saved_ex_oop(ex_map);
duke@0 903 SafePointNode* caller_ex_map = caller.make_exception_state(ex_oop);
duke@0 904 // Finally, collect the new exception state in my exits:
duke@0 905 _exits.add_exception_state(caller_ex_map);
duke@0 906 }
duke@0 907
duke@0 908 //------------------------------do_exits---------------------------------------
duke@0 909 void Parse::do_exits() {
duke@0 910 set_parse_bci(InvocationEntryBci);
duke@0 911
duke@0 912 // Now peephole on the return bits
duke@0 913 Node* region = _exits.control();
duke@0 914 _exits.set_control(gvn().transform(region));
duke@0 915
duke@0 916 Node* iophi = _exits.i_o();
duke@0 917 _exits.set_i_o(gvn().transform(iophi));
duke@0 918
duke@0 919 if (wrote_final()) {
duke@0 920 // This method (which must be a constructor by the rules of Java)
duke@0 921 // wrote a final. The effects of all initializations must be
duke@0 922 // committed to memory before any code after the constructor
duke@0 923 // publishes the reference to the newly constructor object.
duke@0 924 // Rather than wait for the publication, we simply block the
duke@0 925 // writes here. Rather than put a barrier on only those writes
duke@0 926 // which are required to complete, we force all writes to complete.
duke@0 927 //
duke@0 928 // "All bets are off" unless the first publication occurs after a
duke@0 929 // normal return from the constructor. We do not attempt to detect
duke@0 930 // such unusual early publications. But no barrier is needed on
duke@0 931 // exceptional returns, since they cannot publish normally.
duke@0 932 //
duke@0 933 _exits.insert_mem_bar(Op_MemBarRelease);
duke@0 934 #ifndef PRODUCT
duke@0 935 if (PrintOpto && (Verbose || WizardMode)) {
duke@0 936 method()->print_name();
duke@0 937 tty->print_cr(" writes finals and needs a memory barrier");
duke@0 938 }
duke@0 939 #endif
duke@0 940 }
duke@0 941
duke@0 942 for (MergeMemStream mms(_exits.merged_memory()); mms.next_non_empty(); ) {
duke@0 943 // transform each slice of the original memphi:
duke@0 944 mms.set_memory(_gvn.transform(mms.memory()));
duke@0 945 }
duke@0 946
duke@0 947 if (tf()->range()->cnt() > TypeFunc::Parms) {
duke@0 948 const Type* ret_type = tf()->range()->field_at(TypeFunc::Parms);
duke@0 949 Node* ret_phi = _gvn.transform( _exits.argument(0) );
duke@0 950 assert(_exits.control()->is_top() || !_gvn.type(ret_phi)->empty(), "return value must be well defined");
duke@0 951 _exits.push_node(ret_type->basic_type(), ret_phi);
duke@0 952 }
duke@0 953
duke@0 954 // Note: Logic for creating and optimizing the ReturnNode is in Compile.
duke@0 955
duke@0 956 // Unlock along the exceptional paths.
duke@0 957 // This is done late so that we can common up equivalent exceptions
duke@0 958 // (e.g., null checks) arising from multiple points within this method.
duke@0 959 // See GraphKit::add_exception_state, which performs the commoning.
duke@0 960 bool do_synch = method()->is_synchronized() && GenerateSynchronizationCode;
duke@0 961
duke@0 962 // record exit from a method if compiled while Dtrace is turned on.
kvn@780 963 if (do_synch || C->env()->dtrace_method_probes()) {
duke@0 964 // First move the exception list out of _exits:
duke@0 965 GraphKit kit(_exits.transfer_exceptions_into_jvms());
duke@0 966 SafePointNode* normal_map = kit.map(); // keep this guy safe
duke@0 967 // Now re-collect the exceptions into _exits:
duke@0 968 SafePointNode* ex_map;
duke@0 969 while ((ex_map = kit.pop_exception_state()) != NULL) {
duke@0 970 Node* ex_oop = kit.use_exception_state(ex_map);
duke@0 971 // Force the exiting JVM state to have this method at InvocationEntryBci.
duke@0 972 // The exiting JVM state is otherwise a copy of the calling JVMS.
duke@0 973 JVMState* caller = kit.jvms();
duke@0 974 JVMState* ex_jvms = caller->clone_shallow(C);
duke@0 975 ex_jvms->set_map(kit.clone_map());
duke@0 976 ex_jvms->map()->set_jvms(ex_jvms);
duke@0 977 ex_jvms->set_bci( InvocationEntryBci);
duke@0 978 kit.set_jvms(ex_jvms);
duke@0 979 if (do_synch) {
duke@0 980 // Add on the synchronized-method box/object combo
duke@0 981 kit.map()->push_monitor(_synch_lock);
duke@0 982 // Unlock!
duke@0 983 kit.shared_unlock(_synch_lock->box_node(), _synch_lock->obj_node());
duke@0 984 }
kvn@780 985 if (C->env()->dtrace_method_probes()) {
duke@0 986 kit.make_dtrace_method_exit(method());
duke@0 987 }
duke@0 988 // Done with exception-path processing.
duke@0 989 ex_map = kit.make_exception_state(ex_oop);
duke@0 990 assert(ex_jvms->same_calls_as(ex_map->jvms()), "sanity");
duke@0 991 // Pop the last vestige of this method:
duke@0 992 ex_map->set_jvms(caller->clone_shallow(C));
duke@0 993 ex_map->jvms()->set_map(ex_map);
duke@0 994 _exits.push_exception_state(ex_map);
duke@0 995 }
duke@0 996 assert(_exits.map() == normal_map, "keep the same return state");
duke@0 997 }
duke@0 998
duke@0 999 {
duke@0 1000 // Capture very early exceptions (receiver null checks) from caller JVMS
duke@0 1001 GraphKit caller(_caller);
duke@0 1002 SafePointNode* ex_map;
duke@0 1003 while ((ex_map = caller.pop_exception_state()) != NULL) {
duke@0 1004 _exits.add_exception_state(ex_map);
duke@0 1005 }
duke@0 1006 }
duke@0 1007 }
duke@0 1008
duke@0 1009 //-----------------------------create_entry_map-------------------------------
duke@0 1010 // Initialize our parser map to contain the types at method entry.
duke@0 1011 // For OSR, the map contains a single RawPtr parameter.
duke@0 1012 // Initial monitor locking for sync. methods is performed by do_method_entry.
duke@0 1013 SafePointNode* Parse::create_entry_map() {
duke@0 1014 // Check for really stupid bail-out cases.
duke@0 1015 uint len = TypeFunc::Parms + method()->max_locals() + method()->max_stack();
duke@0 1016 if (len >= 32760) {
duke@0 1017 C->record_method_not_compilable_all_tiers("too many local variables");
duke@0 1018 return NULL;
duke@0 1019 }
duke@0 1020
duke@0 1021 // If this is an inlined method, we may have to do a receiver null check.
duke@0 1022 if (_caller->has_method() && is_normal_parse() && !method()->is_static()) {
duke@0 1023 GraphKit kit(_caller);
duke@0 1024 kit.null_check_receiver(method());
duke@0 1025 _caller = kit.transfer_exceptions_into_jvms();
duke@0 1026 if (kit.stopped()) {
duke@0 1027 _exits.add_exception_states_from(_caller);
duke@0 1028 _exits.set_jvms(_caller);
duke@0 1029 return NULL;
duke@0 1030 }
duke@0 1031 }
duke@0 1032
duke@0 1033 assert(method() != NULL, "parser must have a method");
duke@0 1034
duke@0 1035 // Create an initial safepoint to hold JVM state during parsing
duke@0 1036 JVMState* jvms = new (C) JVMState(method(), _caller->has_method() ? _caller : NULL);
duke@0 1037 set_map(new (C, len) SafePointNode(len, jvms));
duke@0 1038 jvms->set_map(map());
duke@0 1039 record_for_igvn(map());
duke@0 1040 assert(jvms->endoff() == len, "correct jvms sizing");
duke@0 1041
duke@0 1042 SafePointNode* inmap = _caller->map();
duke@0 1043 assert(inmap != NULL, "must have inmap");
duke@0 1044
duke@0 1045 uint i;
duke@0 1046
duke@0 1047 // Pass thru the predefined input parameters.
duke@0 1048 for (i = 0; i < TypeFunc::Parms; i++) {
duke@0 1049 map()->init_req(i, inmap->in(i));
duke@0 1050 }
duke@0 1051
duke@0 1052 if (depth() == 1) {
duke@0 1053 assert(map()->memory()->Opcode() == Op_Parm, "");
duke@0 1054 // Insert the memory aliasing node
duke@0 1055 set_all_memory(reset_memory());
duke@0 1056 }
duke@0 1057 assert(merged_memory(), "");
duke@0 1058
duke@0 1059 // Now add the locals which are initially bound to arguments:
duke@0 1060 uint arg_size = tf()->domain()->cnt();
duke@0 1061 ensure_stack(arg_size - TypeFunc::Parms); // OSR methods have funny args
duke@0 1062 for (i = TypeFunc::Parms; i < arg_size; i++) {
duke@0 1063 map()->init_req(i, inmap->argument(_caller, i - TypeFunc::Parms));
duke@0 1064 }
duke@0 1065
duke@0 1066 // Clear out the rest of the map (locals and stack)
duke@0 1067 for (i = arg_size; i < len; i++) {
duke@0 1068 map()->init_req(i, top());
duke@0 1069 }
duke@0 1070
duke@0 1071 SafePointNode* entry_map = stop();
duke@0 1072 return entry_map;
duke@0 1073 }
duke@0 1074
duke@0 1075 //-----------------------------do_method_entry--------------------------------
duke@0 1076 // Emit any code needed in the pseudo-block before BCI zero.
duke@0 1077 // The main thing to do is lock the receiver of a synchronized method.
duke@0 1078 void Parse::do_method_entry() {
duke@0 1079 set_parse_bci(InvocationEntryBci); // Pseudo-BCP
duke@0 1080 set_sp(0); // Java Stack Pointer
duke@0 1081
duke@0 1082 NOT_PRODUCT( count_compiled_calls(true/*at_method_entry*/, false/*is_inline*/); )
duke@0 1083
kvn@780 1084 if (C->env()->dtrace_method_probes()) {
duke@0 1085 make_dtrace_method_entry(method());
duke@0 1086 }
duke@0 1087
duke@0 1088 // If the method is synchronized, we need to construct a lock node, attach
duke@0 1089 // it to the Start node, and pin it there.
duke@0 1090 if (method()->is_synchronized()) {
duke@0 1091 // Insert a FastLockNode right after the Start which takes as arguments
duke@0 1092 // the current thread pointer, the "this" pointer & the address of the
duke@0 1093 // stack slot pair used for the lock. The "this" pointer is a projection
duke@0 1094 // off the start node, but the locking spot has to be constructed by
duke@0 1095 // creating a ConLNode of 0, and boxing it with a BoxLockNode. The BoxLockNode
duke@0 1096 // becomes the second argument to the FastLockNode call. The
duke@0 1097 // FastLockNode becomes the new control parent to pin it to the start.
duke@0 1098
duke@0 1099 // Setup Object Pointer
duke@0 1100 Node *lock_obj = NULL;
duke@0 1101 if(method()->is_static()) {
duke@0 1102 ciInstance* mirror = _method->holder()->java_mirror();
duke@0 1103 const TypeInstPtr *t_lock = TypeInstPtr::make(mirror);
duke@0 1104 lock_obj = makecon(t_lock);
duke@0 1105 } else { // Else pass the "this" pointer,
duke@0 1106 lock_obj = local(0); // which is Parm0 from StartNode
duke@0 1107 }
duke@0 1108 // Clear out dead values from the debug info.
duke@0 1109 kill_dead_locals();
duke@0 1110 // Build the FastLockNode
duke@0 1111 _synch_lock = shared_lock(lock_obj);
duke@0 1112 }
duke@0 1113
duke@0 1114 if (depth() == 1) {
duke@0 1115 increment_and_test_invocation_counter(Tier2CompileThreshold);
duke@0 1116 }
duke@0 1117 }
duke@0 1118
duke@0 1119 //------------------------------init_blocks------------------------------------
duke@0 1120 // Initialize our parser map to contain the types/monitors at method entry.
duke@0 1121 void Parse::init_blocks() {
duke@0 1122 // Create the blocks.
duke@0 1123 _block_count = flow()->block_count();
duke@0 1124 _blocks = NEW_RESOURCE_ARRAY(Block, _block_count);
duke@0 1125 Copy::zero_to_bytes(_blocks, sizeof(Block)*_block_count);
duke@0 1126
never@367 1127 int rpo;
duke@0 1128
duke@0 1129 // Initialize the structs.
never@367 1130 for (rpo = 0; rpo < block_count(); rpo++) {
never@367 1131 Block* block = rpo_at(rpo);
never@367 1132 block->init_node(this, rpo);
duke@0 1133 }
duke@0 1134
duke@0 1135 // Collect predecessor and successor information.
never@367 1136 for (rpo = 0; rpo < block_count(); rpo++) {
never@367 1137 Block* block = rpo_at(rpo);
duke@0 1138 block->init_graph(this);
duke@0 1139 }
duke@0 1140 }
duke@0 1141
duke@0 1142 //-------------------------------init_node-------------------------------------
never@367 1143 void Parse::Block::init_node(Parse* outer, int rpo) {
never@367 1144 _flow = outer->flow()->rpo_at(rpo);
duke@0 1145 _pred_count = 0;
duke@0 1146 _preds_parsed = 0;
duke@0 1147 _count = 0;
duke@0 1148 assert(pred_count() == 0 && preds_parsed() == 0, "sanity");
duke@0 1149 assert(!(is_merged() || is_parsed() || is_handler()), "sanity");
duke@0 1150 assert(_live_locals.size() == 0, "sanity");
duke@0 1151
duke@0 1152 // entry point has additional predecessor
duke@0 1153 if (flow()->is_start()) _pred_count++;
duke@0 1154 assert(flow()->is_start() == (this == outer->start_block()), "");
duke@0 1155 }
duke@0 1156
duke@0 1157 //-------------------------------init_graph------------------------------------
duke@0 1158 void Parse::Block::init_graph(Parse* outer) {
duke@0 1159 // Create the successor list for this parser block.
duke@0 1160 GrowableArray<ciTypeFlow::Block*>* tfs = flow()->successors();
duke@0 1161 GrowableArray<ciTypeFlow::Block*>* tfe = flow()->exceptions();
duke@0 1162 int ns = tfs->length();
duke@0 1163 int ne = tfe->length();
duke@0 1164 _num_successors = ns;
duke@0 1165 _all_successors = ns+ne;
duke@0 1166 _successors = (ns+ne == 0) ? NULL : NEW_RESOURCE_ARRAY(Block*, ns+ne);
duke@0 1167 int p = 0;
duke@0 1168 for (int i = 0; i < ns+ne; i++) {
duke@0 1169 ciTypeFlow::Block* tf2 = (i < ns) ? tfs->at(i) : tfe->at(i-ns);
never@367 1170 Block* block2 = outer->rpo_at(tf2->rpo());
duke@0 1171 _successors[i] = block2;
duke@0 1172
duke@0 1173 // Accumulate pred info for the other block, too.
duke@0 1174 if (i < ns) {
duke@0 1175 block2->_pred_count++;
duke@0 1176 } else {
duke@0 1177 block2->_is_handler = true;
duke@0 1178 }
duke@0 1179
duke@0 1180 #ifdef ASSERT
duke@0 1181 // A block's successors must be distinguishable by BCI.
duke@0 1182 // That is, no bytecode is allowed to branch to two different
duke@0 1183 // clones of the same code location.
duke@0 1184 for (int j = 0; j < i; j++) {
duke@0 1185 Block* block1 = _successors[j];
duke@0 1186 if (block1 == block2) continue; // duplicates are OK
duke@0 1187 assert(block1->start() != block2->start(), "successors have unique bcis");
duke@0 1188 }
duke@0 1189 #endif
duke@0 1190 }
duke@0 1191
duke@0 1192 // Note: We never call next_path_num along exception paths, so they
duke@0 1193 // never get processed as "ready". Also, the input phis of exception
duke@0 1194 // handlers get specially processed, so that
duke@0 1195 }
duke@0 1196
duke@0 1197 //---------------------------successor_for_bci---------------------------------
duke@0 1198 Parse::Block* Parse::Block::successor_for_bci(int bci) {
duke@0 1199 for (int i = 0; i < all_successors(); i++) {
duke@0 1200 Block* block2 = successor_at(i);
duke@0 1201 if (block2->start() == bci) return block2;
duke@0 1202 }
duke@0 1203 // We can actually reach here if ciTypeFlow traps out a block
duke@0 1204 // due to an unloaded class, and concurrently with compilation the
duke@0 1205 // class is then loaded, so that a later phase of the parser is
duke@0 1206 // able to see more of the bytecode CFG. Or, the flow pass and
duke@0 1207 // the parser can have a minor difference of opinion about executability
duke@0 1208 // of bytecodes. For example, "obj.field = null" is executable even
duke@0 1209 // if the field's type is an unloaded class; the flow pass used to
duke@0 1210 // make a trap for such code.
duke@0 1211 return NULL;
duke@0 1212 }
duke@0 1213
duke@0 1214
duke@0 1215 //-----------------------------stack_type_at-----------------------------------
duke@0 1216 const Type* Parse::Block::stack_type_at(int i) const {
duke@0 1217 return get_type(flow()->stack_type_at(i));
duke@0 1218 }
duke@0 1219
duke@0 1220
duke@0 1221 //-----------------------------local_type_at-----------------------------------
duke@0 1222 const Type* Parse::Block::local_type_at(int i) const {
duke@0 1223 // Make dead locals fall to bottom.
duke@0 1224 if (_live_locals.size() == 0) {
duke@0 1225 MethodLivenessResult live_locals = flow()->outer()->method()->liveness_at_bci(start());
duke@0 1226 // This bitmap can be zero length if we saw a breakpoint.
duke@0 1227 // In such cases, pretend they are all live.
duke@0 1228 ((Block*)this)->_live_locals = live_locals;
duke@0 1229 }
duke@0 1230 if (_live_locals.size() > 0 && !_live_locals.at(i))
duke@0 1231 return Type::BOTTOM;
duke@0 1232
duke@0 1233 return get_type(flow()->local_type_at(i));
duke@0 1234 }
duke@0 1235
duke@0 1236
duke@0 1237 #ifndef PRODUCT
duke@0 1238
duke@0 1239 //----------------------------name_for_bc--------------------------------------
duke@0 1240 // helper method for BytecodeParseHistogram
duke@0 1241 static const char* name_for_bc(int i) {
duke@0 1242 return Bytecodes::is_defined(i) ? Bytecodes::name(Bytecodes::cast(i)) : "xxxunusedxxx";
duke@0 1243 }
duke@0 1244
duke@0 1245 //----------------------------BytecodeParseHistogram------------------------------------
duke@0 1246 Parse::BytecodeParseHistogram::BytecodeParseHistogram(Parse *p, Compile *c) {
duke@0 1247 _parser = p;
duke@0 1248 _compiler = c;
duke@0 1249 if( ! _initialized ) { _initialized = true; reset(); }
duke@0 1250 }
duke@0 1251
duke@0 1252 //----------------------------current_count------------------------------------
duke@0 1253 int Parse::BytecodeParseHistogram::current_count(BPHType bph_type) {
duke@0 1254 switch( bph_type ) {
duke@0 1255 case BPH_transforms: { return _parser->gvn().made_progress(); }
duke@0 1256 case BPH_values: { return _parser->gvn().made_new_values(); }
duke@0 1257 default: { ShouldNotReachHere(); return 0; }
duke@0 1258 }
duke@0 1259 }
duke@0 1260
duke@0 1261 //----------------------------initialized--------------------------------------
duke@0 1262 bool Parse::BytecodeParseHistogram::initialized() { return _initialized; }
duke@0 1263
duke@0 1264 //----------------------------reset--------------------------------------------
duke@0 1265 void Parse::BytecodeParseHistogram::reset() {
duke@0 1266 int i = Bytecodes::number_of_codes;
duke@0 1267 while (i-- > 0) { _bytecodes_parsed[i] = 0; _nodes_constructed[i] = 0; _nodes_transformed[i] = 0; _new_values[i] = 0; }
duke@0 1268 }
duke@0 1269
duke@0 1270 //----------------------------set_initial_state--------------------------------
duke@0 1271 // Record info when starting to parse one bytecode
duke@0 1272 void Parse::BytecodeParseHistogram::set_initial_state( Bytecodes::Code bc ) {
duke@0 1273 if( PrintParseStatistics && !_parser->is_osr_parse() ) {
duke@0 1274 _initial_bytecode = bc;
duke@0 1275 _initial_node_count = _compiler->unique();
duke@0 1276 _initial_transforms = current_count(BPH_transforms);
duke@0 1277 _initial_values = current_count(BPH_values);
duke@0 1278 }
duke@0 1279 }
duke@0 1280
duke@0 1281 //----------------------------record_change--------------------------------
duke@0 1282 // Record results of parsing one bytecode
duke@0 1283 void Parse::BytecodeParseHistogram::record_change() {
duke@0 1284 if( PrintParseStatistics && !_parser->is_osr_parse() ) {
duke@0 1285 ++_bytecodes_parsed[_initial_bytecode];
duke@0 1286 _nodes_constructed [_initial_bytecode] += (_compiler->unique() - _initial_node_count);
duke@0 1287 _nodes_transformed [_initial_bytecode] += (current_count(BPH_transforms) - _initial_transforms);
duke@0 1288 _new_values [_initial_bytecode] += (current_count(BPH_values) - _initial_values);
duke@0 1289 }
duke@0 1290 }
duke@0 1291
duke@0 1292
duke@0 1293 //----------------------------print--------------------------------------------
duke@0 1294 void Parse::BytecodeParseHistogram::print(float cutoff) {
duke@0 1295 ResourceMark rm;
duke@0 1296 // print profile
duke@0 1297 int total = 0;
duke@0 1298 int i = 0;
duke@0 1299 for( i = 0; i < Bytecodes::number_of_codes; ++i ) { total += _bytecodes_parsed[i]; }
duke@0 1300 int abs_sum = 0;
duke@0 1301 tty->cr(); //0123456789012345678901234567890123456789012345678901234567890123456789
duke@0 1302 tty->print_cr("Histogram of %d parsed bytecodes:", total);
duke@0 1303 if( total == 0 ) { return; }
duke@0 1304 tty->cr();
duke@0 1305 tty->print_cr("absolute: count of compiled bytecodes of this type");
duke@0 1306 tty->print_cr("relative: percentage contribution to compiled nodes");
duke@0 1307 tty->print_cr("nodes : Average number of nodes constructed per bytecode");
duke@0 1308 tty->print_cr("rnodes : Significance towards total nodes constructed, (nodes*relative)");
duke@0 1309 tty->print_cr("transforms: Average amount of tranform progress per bytecode compiled");
duke@0 1310 tty->print_cr("values : Average number of node values improved per bytecode");
duke@0 1311 tty->print_cr("name : Bytecode name");
duke@0 1312 tty->cr();
duke@0 1313 tty->print_cr(" absolute relative nodes rnodes transforms values name");
duke@0 1314 tty->print_cr("----------------------------------------------------------------------");
duke@0 1315 while (--i > 0) {
duke@0 1316 int abs = _bytecodes_parsed[i];
duke@0 1317 float rel = abs * 100.0F / total;
duke@0 1318 float nodes = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _nodes_constructed[i])/_bytecodes_parsed[i];
duke@0 1319 float rnodes = _bytecodes_parsed[i] == 0 ? 0 : rel * nodes;
duke@0 1320 float xforms = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _nodes_transformed[i])/_bytecodes_parsed[i];
duke@0 1321 float values = _bytecodes_parsed[i] == 0 ? 0 : (1.0F * _new_values [i])/_bytecodes_parsed[i];
duke@0 1322 if (cutoff <= rel) {
duke@0 1323 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@0 1324 abs_sum += abs;
duke@0 1325 }
duke@0 1326 }
duke@0 1327 tty->print_cr("----------------------------------------------------------------------");
duke@0 1328 float rel_sum = abs_sum * 100.0F / total;
duke@0 1329 tty->print_cr("%10d %7.2f%% (cutoff = %.2f%%)", abs_sum, rel_sum, cutoff);
duke@0 1330 tty->print_cr("----------------------------------------------------------------------");
duke@0 1331 tty->cr();
duke@0 1332 }
duke@0 1333 #endif
duke@0 1334
duke@0 1335 //----------------------------load_state_from----------------------------------
duke@0 1336 // Load block/map/sp. But not do not touch iter/bci.
duke@0 1337 void Parse::load_state_from(Block* block) {
duke@0 1338 set_block(block);
duke@0 1339 // load the block's JVM state:
duke@0 1340 set_map(block->start_map());
duke@0 1341 set_sp( block->start_sp());
duke@0 1342 }
duke@0 1343
duke@0 1344
duke@0 1345 //-----------------------------record_state------------------------------------
duke@0 1346 void Parse::Block::record_state(Parse* p) {
duke@0 1347 assert(!is_merged(), "can only record state once, on 1st inflow");
duke@0 1348 assert(start_sp() == p->sp(), "stack pointer must agree with ciTypeFlow");
duke@0 1349 set_start_map(p->stop());
duke@0 1350 }
duke@0 1351
duke@0 1352
duke@0 1353 //------------------------------do_one_block-----------------------------------
duke@0 1354 void Parse::do_one_block() {
duke@0 1355 if (TraceOptoParse) {
duke@0 1356 Block *b = block();
duke@0 1357 int ns = b->num_successors();
duke@0 1358 int nt = b->all_successors();
duke@0 1359
duke@0 1360 tty->print("Parsing block #%d at bci [%d,%d), successors: ",
never@367 1361 block()->rpo(), block()->start(), block()->limit());
duke@0 1362 for (int i = 0; i < nt; i++) {
never@367 1363 tty->print((( i < ns) ? " %d" : " %d(e)"), b->successor_at(i)->rpo());
duke@0 1364 }
never@367 1365 if (b->is_loop_head()) tty->print(" lphd");
duke@0 1366 tty->print_cr("");
duke@0 1367 }
duke@0 1368
duke@0 1369 assert(block()->is_merged(), "must be merged before being parsed");
duke@0 1370 block()->mark_parsed();
duke@0 1371 ++_blocks_parsed;
duke@0 1372
duke@0 1373 // Set iterator to start of block.
duke@0 1374 iter().reset_to_bci(block()->start());
duke@0 1375
duke@0 1376 CompileLog* log = C->log();
duke@0 1377
duke@0 1378 // Parse bytecodes
duke@0 1379 while (!stopped() && !failing()) {
duke@0 1380 iter().next();
duke@0 1381
duke@0 1382 // Learn the current bci from the iterator:
duke@0 1383 set_parse_bci(iter().cur_bci());
duke@0 1384
duke@0 1385 if (bci() == block()->limit()) {
duke@0 1386 // Do not walk into the next block until directed by do_all_blocks.
duke@0 1387 merge(bci());
duke@0 1388 break;
duke@0 1389 }
duke@0 1390 assert(bci() < block()->limit(), "bci still in block");
duke@0 1391
duke@0 1392 if (log != NULL) {
duke@0 1393 // Output an optional context marker, to help place actions
duke@0 1394 // that occur during parsing of this BC. If there is no log
duke@0 1395 // output until the next context string, this context string
duke@0 1396 // will be silently ignored.
duke@0 1397 log->context()->reset();
duke@0 1398 log->context()->print_cr("<bc code='%d' bci='%d'/>", (int)bc(), bci());
duke@0 1399 }
duke@0 1400
duke@0 1401 if (block()->has_trap_at(bci())) {
duke@0 1402 // We must respect the flow pass's traps, because it will refuse
duke@0 1403 // to produce successors for trapping blocks.
duke@0 1404 int trap_index = block()->flow()->trap_index();
duke@0 1405 assert(trap_index != 0, "trap index must be valid");
duke@0 1406 uncommon_trap(trap_index);
duke@0 1407 break;
duke@0 1408 }
duke@0 1409
duke@0 1410 NOT_PRODUCT( parse_histogram()->set_initial_state(bc()); );
duke@0 1411
duke@0 1412 #ifdef ASSERT
duke@0 1413 int pre_bc_sp = sp();
duke@0 1414 int inputs, depth;
duke@0 1415 bool have_se = !stopped() && compute_stack_effects(inputs, depth);
duke@0 1416 assert(!have_se || pre_bc_sp >= inputs, "have enough stack to execute this BC");
duke@0 1417 #endif //ASSERT
duke@0 1418
duke@0 1419 do_one_bytecode();
duke@0 1420
duke@0 1421 assert(!have_se || stopped() || failing() || (sp() - pre_bc_sp) == depth, "correct depth prediction");
duke@0 1422
duke@0 1423 do_exceptions();
duke@0 1424
duke@0 1425 NOT_PRODUCT( parse_histogram()->record_change(); );
duke@0 1426
duke@0 1427 if (log != NULL) log->context()->reset(); // done w/ this one
duke@0 1428
duke@0 1429 // Fall into next bytecode. Each bytecode normally has 1 sequential
duke@0 1430 // successor which is typically made ready by visiting this bytecode.
duke@0 1431 // If the successor has several predecessors, then it is a merge
duke@0 1432 // point, starts a new basic block, and is handled like other basic blocks.
duke@0 1433 }
duke@0 1434 }
duke@0 1435
duke@0 1436
duke@0 1437 //------------------------------merge------------------------------------------
duke@0 1438 void Parse::set_parse_bci(int bci) {
duke@0 1439 set_bci(bci);
duke@0 1440 Node_Notes* nn = C->default_node_notes();
duke@0 1441 if (nn == NULL) return;
duke@0 1442
duke@0 1443 // Collect debug info for inlined calls unless -XX:-DebugInlinedCalls.
duke@0 1444 if (!DebugInlinedCalls && depth() > 1) {
duke@0 1445 return;
duke@0 1446 }
duke@0 1447
duke@0 1448 // Update the JVMS annotation, if present.
duke@0 1449 JVMState* jvms = nn->jvms();
duke@0 1450 if (jvms != NULL && jvms->bci() != bci) {
duke@0 1451 // Update the JVMS.
duke@0 1452 jvms = jvms->clone_shallow(C);
duke@0 1453 jvms->set_bci(bci);
duke@0 1454 nn->set_jvms(jvms);
duke@0 1455 }
duke@0 1456 }
duke@0 1457
duke@0 1458 //------------------------------merge------------------------------------------
duke@0 1459 // Merge the current mapping into the basic block starting at bci
duke@0 1460 void Parse::merge(int target_bci) {
duke@0 1461 Block* target = successor_for_bci(target_bci);
duke@0 1462 if (target == NULL) { handle_missing_successor(target_bci); return; }
duke@0 1463 assert(!target->is_ready(), "our arrival must be expected");
duke@0 1464 int pnum = target->next_path_num();
duke@0 1465 merge_common(target, pnum);
duke@0 1466 }
duke@0 1467
duke@0 1468 //-------------------------merge_new_path--------------------------------------
duke@0 1469 // Merge the current mapping into the basic block, using a new path
duke@0 1470 void Parse::merge_new_path(int target_bci) {
duke@0 1471 Block* target = successor_for_bci(target_bci);
duke@0 1472 if (target == NULL) { handle_missing_successor(target_bci); return; }
duke@0 1473 assert(!target->is_ready(), "new path into frozen graph");
duke@0 1474 int pnum = target->add_new_path();
duke@0 1475 merge_common(target, pnum);
duke@0 1476 }
duke@0 1477
duke@0 1478 //-------------------------merge_exception-------------------------------------
duke@0 1479 // Merge the current mapping into the basic block starting at bci
duke@0 1480 // The ex_oop must be pushed on the stack, unlike throw_to_exit.
duke@0 1481 void Parse::merge_exception(int target_bci) {
duke@0 1482 assert(sp() == 1, "must have only the throw exception on the stack");
duke@0 1483 Block* target = successor_for_bci(target_bci);
duke@0 1484 if (target == NULL) { handle_missing_successor(target_bci); return; }
duke@0 1485 assert(target->is_handler(), "exceptions are handled by special blocks");
duke@0 1486 int pnum = target->add_new_path();
duke@0 1487 merge_common(target, pnum);
duke@0 1488 }
duke@0 1489
duke@0 1490 //--------------------handle_missing_successor---------------------------------
duke@0 1491 void Parse::handle_missing_successor(int target_bci) {
duke@0 1492 #ifndef PRODUCT
duke@0 1493 Block* b = block();
duke@0 1494 int trap_bci = b->flow()->has_trap()? b->flow()->trap_bci(): -1;
never@367 1495 tty->print_cr("### Missing successor at bci:%d for block #%d (trap_bci:%d)", target_bci, b->rpo(), trap_bci);
duke@0 1496 #endif
duke@0 1497 ShouldNotReachHere();
duke@0 1498 }
duke@0 1499
duke@0 1500 //--------------------------merge_common---------------------------------------
duke@0 1501 void Parse::merge_common(Parse::Block* target, int pnum) {
duke@0 1502 if (TraceOptoParse) {
never@367 1503 tty->print("Merging state at block #%d bci:%d", target->rpo(), target->start());
duke@0 1504 }
duke@0 1505
duke@0 1506 // Zap extra stack slots to top
duke@0 1507 assert(sp() == target->start_sp(), "");
duke@0 1508 clean_stack(sp());
duke@0 1509
duke@0 1510 if (!target->is_merged()) { // No prior mapping at this bci
duke@0 1511 if (TraceOptoParse) { tty->print(" with empty state"); }
duke@0 1512
duke@0 1513 // If this path is dead, do not bother capturing it as a merge.
duke@0 1514 // It is "as if" we had 1 fewer predecessors from the beginning.
duke@0 1515 if (stopped()) {
duke@0 1516 if (TraceOptoParse) tty->print_cr(", but path is dead and doesn't count");
duke@0 1517 return;
duke@0 1518 }
duke@0 1519
duke@0 1520 // Record that a new block has been merged.
duke@0 1521 ++_blocks_merged;
duke@0 1522
duke@0 1523 // Make a region if we know there are multiple or unpredictable inputs.
duke@0 1524 // (Also, if this is a plain fall-through, we might see another region,
duke@0 1525 // which must not be allowed into this block's map.)
duke@0 1526 if (pnum > PhiNode::Input // Known multiple inputs.
duke@0 1527 || target->is_handler() // These have unpredictable inputs.
never@367 1528 || target->is_loop_head() // Known multiple inputs
duke@0 1529 || control()->is_Region()) { // We must hide this guy.
duke@0 1530 // Add a Region to start the new basic block. Phis will be added
duke@0 1531 // later lazily.
duke@0 1532 int edges = target->pred_count();
duke@0 1533 if (edges < pnum) edges = pnum; // might be a new path!
duke@0 1534 Node *r = new (C, edges+1) RegionNode(edges+1);
duke@0 1535 gvn().set_type(r, Type::CONTROL);
duke@0 1536 record_for_igvn(r);
duke@0 1537 // zap all inputs to NULL for debugging (done in Node(uint) constructor)
duke@0 1538 // for (int j = 1; j < edges+1; j++) { r->init_req(j, NULL); }
duke@0 1539 r->init_req(pnum, control());
duke@0 1540 set_control(r);
duke@0 1541 }
duke@0 1542
duke@0 1543 // Convert the existing Parser mapping into a mapping at this bci.
duke@0 1544 store_state_to(target);
duke@0 1545 assert(target->is_merged(), "do not come here twice");
duke@0 1546
duke@0 1547 } else { // Prior mapping at this bci
duke@0 1548 if (TraceOptoParse) { tty->print(" with previous state"); }
duke@0 1549
duke@0 1550 // We must not manufacture more phis if the target is already parsed.
duke@0 1551 bool nophi = target->is_parsed();
duke@0 1552
duke@0 1553 SafePointNode* newin = map();// Hang on to incoming mapping
duke@0 1554 Block* save_block = block(); // Hang on to incoming block;
duke@0 1555 load_state_from(target); // Get prior mapping
duke@0 1556
duke@0 1557 assert(newin->jvms()->locoff() == jvms()->locoff(), "JVMS layouts agree");
duke@0 1558 assert(newin->jvms()->stkoff() == jvms()->stkoff(), "JVMS layouts agree");
duke@0 1559 assert(newin->jvms()->monoff() == jvms()->monoff(), "JVMS layouts agree");
duke@0 1560 assert(newin->jvms()->endoff() == jvms()->endoff(), "JVMS layouts agree");
duke@0 1561
duke@0 1562 // Iterate over my current mapping and the old mapping.
duke@0 1563 // Where different, insert Phi functions.
duke@0 1564 // Use any existing Phi functions.
duke@0 1565 assert(control()->is_Region(), "must be merging to a region");
duke@0 1566 RegionNode* r = control()->as_Region();
duke@0 1567
duke@0 1568 // Compute where to merge into
duke@0 1569 // Merge incoming control path
never@367 1570 r->init_req(pnum, newin->control());
duke@0 1571
duke@0 1572 if (pnum == 1) { // Last merge for this Region?
never@367 1573 if (!block()->flow()->is_irreducible_entry()) {
never@367 1574 Node* result = _gvn.transform_no_reclaim(r);
never@367 1575 if (r != result && TraceOptoParse) {
never@367 1576 tty->print_cr("Block #%d replace %d with %d", block()->rpo(), r->_idx, result->_idx);
never@367 1577 }
never@367 1578 }
duke@0 1579 record_for_igvn(r);
duke@0 1580 }
duke@0 1581
duke@0 1582 // Update all the non-control inputs to map:
duke@0 1583 assert(TypeFunc::Parms == newin->jvms()->locoff(), "parser map should contain only youngest jvms");
never@367 1584 bool check_elide_phi = target->is_SEL_backedge(save_block);
duke@0 1585 for (uint j = 1; j < newin->req(); j++) {
duke@0 1586 Node* m = map()->in(j); // Current state of target.
duke@0 1587 Node* n = newin->in(j); // Incoming change to target state.
duke@0 1588 PhiNode* phi;
duke@0 1589 if (m->is_Phi() && m->as_Phi()->region() == r)
duke@0 1590 phi = m->as_Phi();
duke@0 1591 else
duke@0 1592 phi = NULL;
duke@0 1593 if (m != n) { // Different; must merge
duke@0 1594 switch (j) {
duke@0 1595 // Frame pointer and Return Address never changes
duke@0 1596 case TypeFunc::FramePtr:// Drop m, use the original value
duke@0 1597 case TypeFunc::ReturnAdr:
duke@0 1598 break;
duke@0 1599 case TypeFunc::Memory: // Merge inputs to the MergeMem node
duke@0 1600 assert(phi == NULL, "the merge contains phis, not vice versa");
duke@0 1601 merge_memory_edges(n->as_MergeMem(), pnum, nophi);
duke@0 1602 continue;
duke@0 1603 default: // All normal stuff
never@367 1604 if (phi == NULL) {
never@367 1605 if (!check_elide_phi || !target->can_elide_SEL_phi(j)) {
never@367 1606 phi = ensure_phi(j, nophi);
never@367 1607 }
never@367 1608 }
duke@0 1609 break;
duke@0 1610 }
duke@0 1611 }
duke@0 1612 // At this point, n might be top if:
duke@0 1613 // - there is no phi (because TypeFlow detected a conflict), or
duke@0 1614 // - the corresponding control edges is top (a dead incoming path)
duke@0 1615 // It is a bug if we create a phi which sees a garbage value on a live path.
duke@0 1616
duke@0 1617 if (phi != NULL) {
duke@0 1618 assert(n != top() || r->in(pnum) == top(), "live value must not be garbage");
duke@0 1619 assert(phi->region() == r, "");
duke@0 1620 phi->set_req(pnum, n); // Then add 'n' to the merge
duke@0 1621 if (pnum == PhiNode::Input) {
duke@0 1622 // Last merge for this Phi.
duke@0 1623 // So far, Phis have had a reasonable type from ciTypeFlow.
duke@0 1624 // Now _gvn will join that with the meet of current inputs.
duke@0 1625 // BOTTOM is never permissible here, 'cause pessimistically
duke@0 1626 // Phis of pointers cannot lose the basic pointer type.
duke@0 1627 debug_only(const Type* bt1 = phi->bottom_type());
duke@0 1628 assert(bt1 != Type::BOTTOM, "should not be building conflict phis");
duke@0 1629 map()->set_req(j, _gvn.transform_no_reclaim(phi));
duke@0 1630 debug_only(const Type* bt2 = phi->bottom_type());
duke@0 1631 assert(bt2->higher_equal(bt1), "must be consistent with type-flow");
duke@0 1632 record_for_igvn(phi);
duke@0 1633 }
duke@0 1634 }
duke@0 1635 } // End of for all values to be merged
duke@0 1636
duke@0 1637 if (pnum == PhiNode::Input &&
duke@0 1638 !r->in(0)) { // The occasional useless Region
duke@0 1639 assert(control() == r, "");
duke@0 1640 set_control(r->nonnull_req());
duke@0 1641 }
duke@0 1642
duke@0 1643 // newin has been subsumed into the lazy merge, and is now dead.
duke@0 1644 set_block(save_block);
duke@0 1645
duke@0 1646 stop(); // done with this guy, for now
duke@0 1647 }
duke@0 1648
duke@0 1649 if (TraceOptoParse) {
duke@0 1650 tty->print_cr(" on path %d", pnum);
duke@0 1651 }
duke@0 1652
duke@0 1653 // Done with this parser state.
duke@0 1654 assert(stopped(), "");
duke@0 1655 }
duke@0 1656
duke@0 1657
duke@0 1658 //--------------------------merge_memory_edges---------------------------------
duke@0 1659 void Parse::merge_memory_edges(MergeMemNode* n, int pnum, bool nophi) {
duke@0 1660 // (nophi means we must not create phis, because we already parsed here)
duke@0 1661 assert(n != NULL, "");
duke@0 1662 // Merge the inputs to the MergeMems
duke@0 1663 MergeMemNode* m = merged_memory();
duke@0 1664
duke@0 1665 assert(control()->is_Region(), "must be merging to a region");
duke@0 1666 RegionNode* r = control()->as_Region();
duke@0 1667
duke@0 1668 PhiNode* base = NULL;
duke@0 1669 MergeMemNode* remerge = NULL;
duke@0 1670 for (MergeMemStream mms(m, n); mms.next_non_empty2(); ) {
duke@0 1671 Node *p = mms.force_memory();
duke@0 1672 Node *q = mms.memory2();
duke@0 1673 if (mms.is_empty() && nophi) {
duke@0 1674 // Trouble: No new splits allowed after a loop body is parsed.
duke@0 1675 // Instead, wire the new split into a MergeMem on the backedge.
duke@0 1676 // The optimizer will sort it out, slicing the phi.
duke@0 1677 if (remerge == NULL) {
duke@0 1678 assert(base != NULL, "");
duke@0 1679 assert(base->in(0) != NULL, "should not be xformed away");
duke@0 1680 remerge = MergeMemNode::make(C, base->in(pnum));
duke@0 1681 gvn().set_type(remerge, Type::MEMORY);
duke@0 1682 base->set_req(pnum, remerge);
duke@0 1683 }
duke@0 1684 remerge->set_memory_at(mms.alias_idx(), q);
duke@0 1685 continue;
duke@0 1686 }
duke@0 1687 assert(!q->is_MergeMem(), "");
duke@0 1688 PhiNode* phi;
duke@0 1689 if (p != q) {
duke@0 1690 phi = ensure_memory_phi(mms.alias_idx(), nophi);
duke@0 1691 } else {
duke@0 1692 if (p->is_Phi() && p->as_Phi()->region() == r)
duke@0 1693 phi = p->as_Phi();
duke@0 1694 else
duke@0 1695 phi = NULL;
duke@0 1696 }
duke@0 1697 // Insert q into local phi
duke@0 1698 if (phi != NULL) {
duke@0 1699 assert(phi->region() == r, "");
duke@0 1700 p = phi;
duke@0 1701 phi->set_req(pnum, q);
duke@0 1702 if (mms.at_base_memory()) {
duke@0 1703 base = phi; // delay transforming it
duke@0 1704 } else if (pnum == 1) {
duke@0 1705 record_for_igvn(phi);
duke@0 1706 p = _gvn.transform_no_reclaim(phi);
duke@0 1707 }
duke@0 1708 mms.set_memory(p);// store back through the iterator
duke@0 1709 }
duke@0 1710 }
duke@0 1711 // Transform base last, in case we must fiddle with remerging.
duke@0 1712 if (base != NULL && pnum == 1) {
duke@0 1713 record_for_igvn(base);
duke@0 1714 m->set_base_memory( _gvn.transform_no_reclaim(base) );
duke@0 1715 }
duke@0 1716 }
duke@0 1717
duke@0 1718
duke@0 1719 //------------------------ensure_phis_everywhere-------------------------------
duke@0 1720 void Parse::ensure_phis_everywhere() {
duke@0 1721 ensure_phi(TypeFunc::I_O);
duke@0 1722
duke@0 1723 // Ensure a phi on all currently known memories.
duke@0 1724 for (MergeMemStream mms(merged_memory()); mms.next_non_empty(); ) {
duke@0 1725 ensure_memory_phi(mms.alias_idx());
duke@0 1726 debug_only(mms.set_memory()); // keep the iterator happy
duke@0 1727 }
duke@0 1728
duke@0 1729 // Note: This is our only chance to create phis for memory slices.
duke@0 1730 // If we miss a slice that crops up later, it will have to be
duke@0 1731 // merged into the base-memory phi that we are building here.
duke@0 1732 // Later, the optimizer will comb out the knot, and build separate
duke@0 1733 // phi-loops for each memory slice that matters.
duke@0 1734
duke@0 1735 // Monitors must nest nicely and not get confused amongst themselves.
duke@0 1736 // Phi-ify everything up to the monitors, though.
duke@0 1737 uint monoff = map()->jvms()->monoff();
duke@0 1738 uint nof_monitors = map()->jvms()->nof_monitors();
duke@0 1739
duke@0 1740 assert(TypeFunc::Parms == map()->jvms()->locoff(), "parser map should contain only youngest jvms");
never@367 1741 bool check_elide_phi = block()->is_SEL_head();
duke@0 1742 for (uint i = TypeFunc::Parms; i < monoff; i++) {
never@367 1743 if (!check_elide_phi || !block()->can_elide_SEL_phi(i)) {
never@367 1744 ensure_phi(i);
never@367 1745 }
duke@0 1746 }
never@367 1747
duke@0 1748 // Even monitors need Phis, though they are well-structured.
duke@0 1749 // This is true for OSR methods, and also for the rare cases where
duke@0 1750 // a monitor object is the subject of a replace_in_map operation.
duke@0 1751 // See bugs 4426707 and 5043395.
duke@0 1752 for (uint m = 0; m < nof_monitors; m++) {
duke@0 1753 ensure_phi(map()->jvms()->monitor_obj_offset(m));
duke@0 1754 }
duke@0 1755 }
duke@0 1756
duke@0 1757
duke@0 1758 //-----------------------------add_new_path------------------------------------
duke@0 1759 // Add a previously unaccounted predecessor to this block.
duke@0 1760 int Parse::Block::add_new_path() {
duke@0 1761 // If there is no map, return the lowest unused path number.
duke@0 1762 if (!is_merged()) return pred_count()+1; // there will be a map shortly
duke@0 1763
duke@0 1764 SafePointNode* map = start_map();
duke@0 1765 if (!map->control()->is_Region())
duke@0 1766 return pred_count()+1; // there may be a region some day
duke@0 1767 RegionNode* r = map->control()->as_Region();
duke@0 1768
duke@0 1769 // Add new path to the region.
duke@0 1770 uint pnum = r->req();
duke@0 1771 r->add_req(NULL);
duke@0 1772
duke@0 1773 for (uint i = 1; i < map->req(); i++) {
duke@0 1774 Node* n = map->in(i);
duke@0 1775 if (i == TypeFunc::Memory) {
duke@0 1776 // Ensure a phi on all currently known memories.
duke@0 1777 for (MergeMemStream mms(n->as_MergeMem()); mms.next_non_empty(); ) {
duke@0 1778 Node* phi = mms.memory();
duke@0 1779 if (phi->is_Phi() && phi->as_Phi()->region() == r) {
duke@0 1780 assert(phi->req() == pnum, "must be same size as region");
duke@0 1781 phi->add_req(NULL);
duke@0 1782 }
duke@0 1783 }
duke@0 1784 } else {
duke@0 1785 if (n->is_Phi() && n->as_Phi()->region() == r) {
duke@0 1786 assert(n->req() == pnum, "must be same size as region");
duke@0 1787 n->add_req(NULL);
duke@0 1788 }
duke@0 1789 }
duke@0 1790 }
duke@0 1791
duke@0 1792 return pnum;
duke@0 1793 }
duke@0 1794
duke@0 1795 //------------------------------ensure_phi-------------------------------------
duke@0 1796 // Turn the idx'th entry of the current map into a Phi
duke@0 1797 PhiNode *Parse::ensure_phi(int idx, bool nocreate) {
duke@0 1798 SafePointNode* map = this->map();
duke@0 1799 Node* region = map->control();
duke@0 1800 assert(region->is_Region(), "");
duke@0 1801
duke@0 1802 Node* o = map->in(idx);
duke@0 1803 assert(o != NULL, "");
duke@0 1804
duke@0 1805 if (o == top()) return NULL; // TOP always merges into TOP
duke@0 1806
duke@0 1807 if (o->is_Phi() && o->as_Phi()->region() == region) {
duke@0 1808 return o->as_Phi();
duke@0 1809 }
duke@0 1810
duke@0 1811 // Now use a Phi here for merging
duke@0 1812 assert(!nocreate, "Cannot build a phi for a block already parsed.");
duke@0 1813 const JVMState* jvms = map->jvms();
duke@0 1814 const Type* t;
duke@0 1815 if (jvms->is_loc(idx)) {
duke@0 1816 t = block()->local_type_at(idx - jvms->locoff());
duke@0 1817 } else if (jvms->is_stk(idx)) {
duke@0 1818 t = block()->stack_type_at(idx - jvms->stkoff());
duke@0 1819 } else if (jvms->is_mon(idx)) {
duke@0 1820 assert(!jvms->is_monitor_box(idx), "no phis for boxes");
duke@0 1821 t = TypeInstPtr::BOTTOM; // this is sufficient for a lock object
duke@0 1822 } else if ((uint)idx < TypeFunc::Parms) {
duke@0 1823 t = o->bottom_type(); // Type::RETURN_ADDRESS or such-like.
duke@0 1824 } else {
duke@0 1825 assert(false, "no type information for this phi");
duke@0 1826 }
duke@0 1827
duke@0 1828 // If the type falls to bottom, then this must be a local that
duke@0 1829 // is mixing ints and oops or some such. Forcing it to top
duke@0 1830 // makes it go dead.
duke@0 1831 if (t == Type::BOTTOM) {
duke@0 1832 map->set_req(idx, top());
duke@0 1833 return NULL;
duke@0 1834 }
duke@0 1835
duke@0 1836 // Do not create phis for top either.
duke@0 1837 // A top on a non-null control flow must be an unused even after the.phi.
duke@0 1838 if (t == Type::TOP || t == Type::HALF) {
duke@0 1839 map->set_req(idx, top());
duke@0 1840 return NULL;
duke@0 1841 }
duke@0 1842
duke@0 1843 PhiNode* phi = PhiNode::make(region, o, t);
duke@0 1844 gvn().set_type(phi, t);
kvn@38 1845 if (C->do_escape_analysis()) record_for_igvn(phi);
duke@0 1846 map->set_req(idx, phi);
duke@0 1847 return phi;
duke@0 1848 }
duke@0 1849
duke@0 1850 //--------------------------ensure_memory_phi----------------------------------
duke@0 1851 // Turn the idx'th slice of the current memory into a Phi
duke@0 1852 PhiNode *Parse::ensure_memory_phi(int idx, bool nocreate) {
duke@0 1853 MergeMemNode* mem = merged_memory();
duke@0 1854 Node* region = control();
duke@0 1855 assert(region->is_Region(), "");
duke@0 1856
duke@0 1857 Node *o = (idx == Compile::AliasIdxBot)? mem->base_memory(): mem->memory_at(idx);
duke@0 1858 assert(o != NULL && o != top(), "");
duke@0 1859
duke@0 1860 PhiNode* phi;
duke@0 1861 if (o->is_Phi() && o->as_Phi()->region() == region) {
duke@0 1862 phi = o->as_Phi();
duke@0 1863 if (phi == mem->base_memory() && idx >= Compile::AliasIdxRaw) {
duke@0 1864 // clone the shared base memory phi to make a new memory split
duke@0 1865 assert(!nocreate, "Cannot build a phi for a block already parsed.");
duke@0 1866 const Type* t = phi->bottom_type();
duke@0 1867 const TypePtr* adr_type = C->get_adr_type(idx);
duke@0 1868 phi = phi->slice_memory(adr_type);
duke@0 1869 gvn().set_type(phi, t);
duke@0 1870 }
duke@0 1871 return phi;
duke@0 1872 }
duke@0 1873
duke@0 1874 // Now use a Phi here for merging
duke@0 1875 assert(!nocreate, "Cannot build a phi for a block already parsed.");
duke@0 1876 const Type* t = o->bottom_type();
duke@0 1877 const TypePtr* adr_type = C->get_adr_type(idx);
duke@0 1878 phi = PhiNode::make(region, o, t, adr_type);
duke@0 1879 gvn().set_type(phi, t);
duke@0 1880 if (idx == Compile::AliasIdxBot)
duke@0 1881 mem->set_base_memory(phi);
duke@0 1882 else
duke@0 1883 mem->set_memory_at(idx, phi);
duke@0 1884 return phi;
duke@0 1885 }
duke@0 1886
duke@0 1887 //------------------------------call_register_finalizer-----------------------
duke@0 1888 // Check the klass of the receiver and call register_finalizer if the
duke@0 1889 // class need finalization.
duke@0 1890 void Parse::call_register_finalizer() {
duke@0 1891 Node* receiver = local(0);
duke@0 1892 assert(receiver != NULL && receiver->bottom_type()->isa_instptr() != NULL,
duke@0 1893 "must have non-null instance type");
duke@0 1894
duke@0 1895 const TypeInstPtr *tinst = receiver->bottom_type()->isa_instptr();
duke@0 1896 if (tinst != NULL && tinst->klass()->is_loaded() && !tinst->klass_is_exact()) {
duke@0 1897 // The type isn't known exactly so see if CHA tells us anything.
duke@0 1898 ciInstanceKlass* ik = tinst->klass()->as_instance_klass();
duke@0 1899 if (!Dependencies::has_finalizable_subclass(ik)) {
duke@0 1900 // No finalizable subclasses so skip the dynamic check.
duke@0 1901 C->dependencies()->assert_has_no_finalizable_subclasses(ik);
duke@0 1902 return;
duke@0 1903 }
duke@0 1904 }
duke@0 1905
duke@0 1906 // Insert a dynamic test for whether the instance needs
duke@0 1907 // finalization. In general this will fold up since the concrete
duke@0 1908 // class is often visible so the access flags are constant.
duke@0 1909 Node* klass_addr = basic_plus_adr( receiver, receiver, oopDesc::klass_offset_in_bytes() );
kvn@164 1910 Node* klass = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), klass_addr, TypeInstPtr::KLASS) );
duke@0 1911
duke@0 1912 Node* access_flags_addr = basic_plus_adr(klass, klass, Klass::access_flags_offset_in_bytes() + sizeof(oopDesc));
duke@0 1913 Node* access_flags = make_load(NULL, access_flags_addr, TypeInt::INT, T_INT);
duke@0 1914
duke@0 1915 Node* mask = _gvn.transform(new (C, 3) AndINode(access_flags, intcon(JVM_ACC_HAS_FINALIZER)));
duke@0 1916 Node* check = _gvn.transform(new (C, 3) CmpINode(mask, intcon(0)));
duke@0 1917 Node* test = _gvn.transform(new (C, 2) BoolNode(check, BoolTest::ne));
duke@0 1918
duke@0 1919 IfNode* iff = create_and_map_if(control(), test, PROB_MAX, COUNT_UNKNOWN);
duke@0 1920
duke@0 1921 RegionNode* result_rgn = new (C, 3) RegionNode(3);
duke@0 1922 record_for_igvn(result_rgn);
duke@0 1923
duke@0 1924 Node *skip_register = _gvn.transform(new (C, 1) IfFalseNode(iff));
duke@0 1925 result_rgn->init_req(1, skip_register);
duke@0 1926
duke@0 1927 Node *needs_register = _gvn.transform(new (C, 1) IfTrueNode(iff));
duke@0 1928 set_control(needs_register);
duke@0 1929 if (stopped()) {
duke@0 1930 // There is no slow path.
duke@0 1931 result_rgn->init_req(2, top());
duke@0 1932 } else {
duke@0 1933 Node *call = make_runtime_call(RC_NO_LEAF,
duke@0 1934 OptoRuntime::register_finalizer_Type(),
duke@0 1935 OptoRuntime::register_finalizer_Java(),
duke@0 1936 NULL, TypePtr::BOTTOM,
duke@0 1937 receiver);
duke@0 1938 make_slow_call_ex(call, env()->Throwable_klass(), true);
duke@0 1939
duke@0 1940 Node* fast_io = call->in(TypeFunc::I_O);
duke@0 1941 Node* fast_mem = call->in(TypeFunc::Memory);
duke@0 1942 // These two phis are pre-filled with copies of of the fast IO and Memory
duke@0 1943 Node* io_phi = PhiNode::make(result_rgn, fast_io, Type::ABIO);
duke@0 1944 Node* mem_phi = PhiNode::make(result_rgn, fast_mem, Type::MEMORY, TypePtr::BOTTOM);
duke@0 1945
duke@0 1946 result_rgn->init_req(2, control());
duke@0 1947 io_phi ->init_req(2, i_o());
duke@0 1948 mem_phi ->init_req(2, reset_memory());
duke@0 1949
duke@0 1950 set_all_memory( _gvn.transform(mem_phi) );
duke@0 1951 set_i_o( _gvn.transform(io_phi) );
duke@0 1952 }
duke@0 1953
duke@0 1954 set_control( _gvn.transform(result_rgn) );
duke@0 1955 }
duke@0 1956
duke@0 1957 //------------------------------return_current---------------------------------
duke@0 1958 // Append current _map to _exit_return
duke@0 1959 void Parse::return_current(Node* value) {
duke@0 1960 if (RegisterFinalizersAtInit &&
duke@0 1961 method()->intrinsic_id() == vmIntrinsics::_Object_init) {
duke@0 1962 call_register_finalizer();
duke@0 1963 }
duke@0 1964
duke@0 1965 // Do not set_parse_bci, so that return goo is credited to the return insn.
duke@0 1966 set_bci(InvocationEntryBci);
duke@0 1967 if (method()->is_synchronized() && GenerateSynchronizationCode) {
duke@0 1968 shared_unlock(_synch_lock->box_node(), _synch_lock->obj_node());
duke@0 1969 }
kvn@780 1970 if (C->env()->dtrace_method_probes()) {
duke@0 1971 make_dtrace_method_exit(method());
duke@0 1972 }
duke@0 1973 SafePointNode* exit_return = _exits.map();
duke@0 1974 exit_return->in( TypeFunc::Control )->add_req( control() );
duke@0 1975 exit_return->in( TypeFunc::I_O )->add_req( i_o () );
duke@0 1976 Node *mem = exit_return->in( TypeFunc::Memory );
duke@0 1977 for (MergeMemStream mms(mem->as_MergeMem(), merged_memory()); mms.next_non_empty2(); ) {
duke@0 1978 if (mms.is_empty()) {
duke@0 1979 // get a copy of the base memory, and patch just this one input
duke@0 1980 const TypePtr* adr_type = mms.adr_type(C);
duke@0 1981 Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type);
duke@0 1982 assert(phi->as_Phi()->region() == mms.base_memory()->in(0), "");
duke@0 1983 gvn().set_type_bottom(phi);
duke@0 1984 phi->del_req(phi->req()-1); // prepare to re-patch
duke@0 1985 mms.set_memory(phi);
duke@0 1986 }
duke@0 1987 mms.memory()->add_req(mms.memory2());
duke@0 1988 }
duke@0 1989
duke@0 1990 // frame pointer is always same, already captured
duke@0 1991 if (value != NULL) {
duke@0 1992 // If returning oops to an interface-return, there is a silent free
duke@0 1993 // cast from oop to interface allowed by the Verifier. Make it explicit
duke@0 1994 // here.
duke@0 1995 Node* phi = _exits.argument(0);
duke@0 1996 const TypeInstPtr *tr = phi->bottom_type()->isa_instptr();
duke@0 1997 if( tr && tr->klass()->is_loaded() &&
duke@0 1998 tr->klass()->is_interface() ) {
duke@0 1999 const TypeInstPtr *tp = value->bottom_type()->isa_instptr();
duke@0 2000 if (tp && tp->klass()->is_loaded() &&
duke@0 2001 !tp->klass()->is_interface()) {
duke@0 2002 // sharpen the type eagerly; this eases certain assert checking
duke@0 2003 if (tp->higher_equal(TypeInstPtr::NOTNULL))
duke@0 2004 tr = tr->join(TypeInstPtr::NOTNULL)->is_instptr();
duke@0 2005 value = _gvn.transform(new (C, 2) CheckCastPPNode(0,value,tr));
duke@0 2006 }
duke@0 2007 }
duke@0 2008 phi->add_req(value);
duke@0 2009 }
duke@0 2010
duke@0 2011 stop_and_kill_map(); // This CFG path dies here
duke@0 2012 }
duke@0 2013
duke@0 2014
duke@0 2015 //------------------------------add_safepoint----------------------------------
duke@0 2016 void Parse::add_safepoint() {
duke@0 2017 // See if we can avoid this safepoint. No need for a SafePoint immediately
duke@0 2018 // after a Call (except Leaf Call) or another SafePoint.
duke@0 2019 Node *proj = control();
duke@0 2020 bool add_poll_param = SafePointNode::needs_polling_address_input();
duke@0 2021 uint parms = add_poll_param ? TypeFunc::Parms+1 : TypeFunc::Parms;
duke@0 2022 if( proj->is_Proj() ) {
duke@0 2023 Node *n0 = proj->in(0);
duke@0 2024 if( n0->is_Catch() ) {
duke@0 2025 n0 = n0->in(0)->in(0);
duke@0 2026 assert( n0->is_Call(), "expect a call here" );
duke@0 2027 }
duke@0 2028 if( n0->is_Call() ) {
duke@0 2029 if( n0->as_Call()->guaranteed_safepoint() )
duke@0 2030 return;
duke@0 2031 } else if( n0->is_SafePoint() && n0->req() >= parms ) {
duke@0 2032 return;
duke@0 2033 }
duke@0 2034 }
duke@0 2035
duke@0 2036 // Clear out dead values from the debug info.
duke@0 2037 kill_dead_locals();
duke@0 2038
duke@0 2039 // Clone the JVM State
duke@0 2040 SafePointNode *sfpnt = new (C, parms) SafePointNode(parms, NULL);
duke@0 2041
duke@0 2042 // Capture memory state BEFORE a SafePoint. Since we can block at a
duke@0 2043 // SafePoint we need our GC state to be safe; i.e. we need all our current
duke@0 2044 // write barriers (card marks) to not float down after the SafePoint so we
duke@0 2045 // must read raw memory. Likewise we need all oop stores to match the card
duke@0 2046 // marks. If deopt can happen, we need ALL stores (we need the correct JVM
duke@0 2047 // state on a deopt).
duke@0 2048
duke@0 2049 // We do not need to WRITE the memory state after a SafePoint. The control
duke@0 2050 // edge will keep card-marks and oop-stores from floating up from below a
duke@0 2051 // SafePoint and our true dependency added here will keep them from floating
duke@0 2052 // down below a SafePoint.
duke@0 2053
duke@0 2054 // Clone the current memory state
duke@0 2055 Node* mem = MergeMemNode::make(C, map()->memory());
duke@0 2056
duke@0 2057 mem = _gvn.transform(mem);
duke@0 2058
duke@0 2059 // Pass control through the safepoint
duke@0 2060 sfpnt->init_req(TypeFunc::Control , control());
duke@0 2061 // Fix edges normally used by a call
duke@0 2062 sfpnt->init_req(TypeFunc::I_O , top() );
duke@0 2063 sfpnt->init_req(TypeFunc::Memory , mem );
duke@0 2064 sfpnt->init_req(TypeFunc::ReturnAdr, top() );
duke@0 2065 sfpnt->init_req(TypeFunc::FramePtr , top() );
duke@0 2066
duke@0 2067 // Create a node for the polling address
duke@0 2068 if( add_poll_param ) {
duke@0 2069 Node *polladr = ConPNode::make(C, (address)os::get_polling_page());
duke@0 2070 sfpnt->init_req(TypeFunc::Parms+0, _gvn.transform(polladr));
duke@0 2071 }
duke@0 2072
duke@0 2073 // Fix up the JVM State edges
duke@0 2074 add_safepoint_edges(sfpnt);
duke@0 2075 Node *transformed_sfpnt = _gvn.transform(sfpnt);
duke@0 2076 set_control(transformed_sfpnt);
duke@0 2077
duke@0 2078 // Provide an edge from root to safepoint. This makes the safepoint
duke@0 2079 // appear useful until the parse has completed.
duke@0 2080 if( OptoRemoveUseless && transformed_sfpnt->is_SafePoint() ) {
duke@0 2081 assert(C->root() != NULL, "Expect parse is still valid");
duke@0 2082 C->root()->add_prec(transformed_sfpnt);
duke@0 2083 }
duke@0 2084 }
duke@0 2085
duke@0 2086 #ifndef PRODUCT
duke@0 2087 //------------------------show_parse_info--------------------------------------
duke@0 2088 void Parse::show_parse_info() {
duke@0 2089 InlineTree* ilt = NULL;
duke@0 2090 if (C->ilt() != NULL) {
duke@0 2091 JVMState* caller_jvms = is_osr_parse() ? caller()->caller() : caller();
duke@0 2092 ilt = InlineTree::find_subtree_from_root(C->ilt(), caller_jvms, method());
duke@0 2093 }
duke@0 2094 if (PrintCompilation && Verbose) {
duke@0 2095 if (depth() == 1) {
duke@0 2096 if( ilt->count_inlines() ) {
duke@0 2097 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(),
duke@0 2098 ilt->count_inline_bcs());
duke@0 2099 tty->cr();
duke@0 2100 }
duke@0 2101 } else {
duke@0 2102 if (method()->is_synchronized()) tty->print("s");
duke@0 2103 if (method()->has_exception_handlers()) tty->print("!");
duke@0 2104 // Check this is not the final compiled version
duke@0 2105 if (C->trap_can_recompile()) {
duke@0 2106 tty->print("-");
duke@0 2107 } else {
duke@0 2108 tty->print(" ");
duke@0 2109 }
duke@0 2110 method()->print_short_name();
duke@0 2111 if (is_osr_parse()) {
duke@0 2112 tty->print(" @ %d", osr_bci());
duke@0 2113 }
duke@0 2114 tty->print(" (%d bytes)",method()->code_size());
duke@0 2115 if (ilt->count_inlines()) {
duke@0 2116 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(),
duke@0 2117 ilt->count_inline_bcs());
duke@0 2118 }
duke@0 2119 tty->cr();
duke@0 2120 }
duke@0 2121 }
duke@0 2122 if (PrintOpto && (depth() == 1 || PrintOptoInlining)) {
duke@0 2123 // Print that we succeeded; suppress this message on the first osr parse.
duke@0 2124
duke@0 2125 if (method()->is_synchronized()) tty->print("s");
duke@0 2126 if (method()->has_exception_handlers()) tty->print("!");
duke@0 2127 // Check this is not the final compiled version
duke@0 2128 if (C->trap_can_recompile() && depth() == 1) {
duke@0 2129 tty->print("-");
duke@0 2130 } else {
duke@0 2131 tty->print(" ");
duke@0 2132 }
duke@0 2133 if( depth() != 1 ) { tty->print(" "); } // missing compile count
duke@0 2134 for (int i = 1; i < depth(); ++i) { tty->print(" "); }
duke@0 2135 method()->print_short_name();
duke@0 2136 if (is_osr_parse()) {
duke@0 2137 tty->print(" @ %d", osr_bci());
duke@0 2138 }
duke@0 2139 if (ilt->caller_bci() != -1) {
duke@0 2140 tty->print(" @ %d", ilt->caller_bci());
duke@0 2141 }
duke@0 2142 tty->print(" (%d bytes)",method()->code_size());
duke@0 2143 if (ilt->count_inlines()) {
duke@0 2144 tty->print(" __inlined %d (%d bytes)", ilt->count_inlines(),
duke@0 2145 ilt->count_inline_bcs());
duke@0 2146 }
duke@0 2147 tty->cr();
duke@0 2148 }
duke@0 2149 }
duke@0 2150
duke@0 2151
duke@0 2152 //------------------------------dump-------------------------------------------
duke@0 2153 // Dump information associated with the bytecodes of current _method
duke@0 2154 void Parse::dump() {
duke@0 2155 if( method() != NULL ) {
duke@0 2156 // Iterate over bytecodes
duke@0 2157 ciBytecodeStream iter(method());
duke@0 2158 for( Bytecodes::Code bc = iter.next(); bc != ciBytecodeStream::EOBC() ; bc = iter.next() ) {
duke@0 2159 dump_bci( iter.cur_bci() );
duke@0 2160 tty->cr();
duke@0 2161 }
duke@0 2162 }
duke@0 2163 }
duke@0 2164
duke@0 2165 // Dump information associated with a byte code index, 'bci'
duke@0 2166 void Parse::dump_bci(int bci) {
duke@0 2167 // Output info on merge-points, cloning, and within _jsr..._ret
duke@0 2168 // NYI
duke@0 2169 tty->print(" bci:%d", bci);
duke@0 2170 }
duke@0 2171
duke@0 2172 #endif