12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "compiler/compileLog.hpp"
26 #include "interpreter/linkResolver.hpp"
27 #include "memory/resourceArea.hpp"
28 #include "oops/method.hpp"
29 #include "opto/addnode.hpp"
30 #include "opto/c2compiler.hpp"
31 #include "opto/castnode.hpp"
32 #include "opto/idealGraphPrinter.hpp"
33 #include "opto/locknode.hpp"
34 #include "opto/memnode.hpp"
35 #include "opto/opaquenode.hpp"
36 #include "opto/parse.hpp"
37 #include "opto/rootnode.hpp"
38 #include "opto/runtime.hpp"
39 #include "opto/type.hpp"
40 #include "runtime/handles.inline.hpp"
41 #include "runtime/safepointMechanism.hpp"
42 #include "runtime/sharedRuntime.hpp"
43 #include "utilities/bitMap.inline.hpp"
44 #include "utilities/copy.hpp"
45
46 // Static array so we can figure out which bytecodes stop us from compiling
47 // the most. Some of the non-static variables are needed in bytecodeInfo.cpp
48 // and eventually should be encapsulated in a proper class (gri 8/18/98).
49
50 #ifndef PRODUCT
51 uint nodes_created = 0;
52 uint methods_parsed = 0;
84 }
85 if (all_null_checks_found) {
86 tty->print_cr("%u made implicit (%2u%%)", implicit_null_checks,
87 (100*implicit_null_checks)/all_null_checks_found);
88 }
89 if (SharedRuntime::_implicit_null_throws) {
90 tty->print_cr("%u implicit null exceptions at runtime",
91 SharedRuntime::_implicit_null_throws);
92 }
93
94 if (PrintParseStatistics && BytecodeParseHistogram::initialized()) {
95 BytecodeParseHistogram::print();
96 }
97 }
98 #endif
99
100 //------------------------------ON STACK REPLACEMENT---------------------------
101
102 // Construct a node which can be used to get incoming state for
103 // on stack replacement.
104 Node *Parse::fetch_interpreter_state(int index,
105 BasicType bt,
106 Node *local_addrs,
107 Node *local_addrs_base) {
108 Node *mem = memory(Compile::AliasIdxRaw);
109 Node *adr = basic_plus_adr( local_addrs_base, local_addrs, -index*wordSize );
110 Node *ctl = control();
111
112 // Very similar to LoadNode::make, except we handle un-aligned longs and
113 // doubles on Sparc. Intel can handle them just fine directly.
114 Node *l = nullptr;
115 switch (bt) { // Signature is flattened
116 case T_INT: l = new LoadINode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeInt::INT, MemNode::unordered); break;
117 case T_FLOAT: l = new LoadFNode(ctl, mem, adr, TypeRawPtr::BOTTOM, Type::FLOAT, MemNode::unordered); break;
118 case T_ADDRESS: l = new LoadPNode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM, MemNode::unordered); break;
119 case T_OBJECT: l = new LoadPNode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeInstPtr::BOTTOM, MemNode::unordered); break;
120 case T_LONG:
121 case T_DOUBLE: {
122 // Since arguments are in reverse order, the argument address 'adr'
123 // refers to the back half of the long/double. Recompute adr.
124 adr = basic_plus_adr(local_addrs_base, local_addrs, -(index+1)*wordSize);
125 if (Matcher::misaligned_doubles_ok) {
126 l = (bt == T_DOUBLE)
127 ? (Node*)new LoadDNode(ctl, mem, adr, TypeRawPtr::BOTTOM, Type::DOUBLE, MemNode::unordered)
129 } else {
130 l = (bt == T_DOUBLE)
131 ? (Node*)new LoadD_unalignedNode(ctl, mem, adr, TypeRawPtr::BOTTOM, MemNode::unordered)
132 : (Node*)new LoadL_unalignedNode(ctl, mem, adr, TypeRawPtr::BOTTOM, MemNode::unordered);
133 }
134 break;
135 }
136 default: ShouldNotReachHere();
137 }
138 return _gvn.transform(l);
139 }
140
141 // Helper routine to prevent the interpreter from handing
142 // unexpected typestate to an OSR method.
143 // The Node l is a value newly dug out of the interpreter frame.
144 // The type is the type predicted by ciTypeFlow. Note that it is
145 // not a general type, but can only come from Type::get_typeflow_type.
146 // The safepoint is a map which will feed an uncommon trap.
147 Node* Parse::check_interpreter_type(Node* l, const Type* type,
148 SafePointNode* &bad_type_exit) {
149
150 const TypeOopPtr* tp = type->isa_oopptr();
151
152 // TypeFlow may assert null-ness if a type appears unloaded.
153 if (type == TypePtr::NULL_PTR ||
154 (tp != nullptr && !tp->is_loaded())) {
155 // Value must be null, not a real oop.
156 Node* chk = _gvn.transform( new CmpPNode(l, null()) );
157 Node* tst = _gvn.transform( new BoolNode(chk, BoolTest::eq) );
158 IfNode* iff = create_and_map_if(control(), tst, PROB_MAX, COUNT_UNKNOWN);
159 set_control(_gvn.transform( new IfTrueNode(iff) ));
160 Node* bad_type = _gvn.transform( new IfFalseNode(iff) );
161 bad_type_exit->control()->add_req(bad_type);
162 l = null();
163 }
164
165 // Typeflow can also cut off paths from the CFG, based on
166 // types which appear unloaded, or call sites which appear unlinked.
167 // When paths are cut off, values at later merge points can rise
168 // toward more specific classes. Make sure these specific classes
169 // are still in effect.
170 if (tp != nullptr && !tp->is_same_java_type_as(TypeInstPtr::BOTTOM)) {
171 // TypeFlow asserted a specific object type. Value must have that type.
172 Node* bad_type_ctrl = nullptr;
173 l = gen_checkcast(l, makecon(tp->as_klass_type()->cast_to_exactness(true)), &bad_type_ctrl);
174 bad_type_exit->control()->add_req(bad_type_ctrl);
175 }
176
177 assert(_gvn.type(l)->higher_equal(type), "must constrain OSR typestate");
178 return l;
179 }
180
181 // Helper routine which sets up elements of the initial parser map when
182 // performing a parse for on stack replacement. Add values into map.
183 // The only parameter contains the address of a interpreter arguments.
184 void Parse::load_interpreter_state(Node* osr_buf) {
185 int index;
186 int max_locals = jvms()->loc_size();
187 int max_stack = jvms()->stk_size();
188
189
190 // Mismatch between method and jvms can occur since map briefly held
191 // an OSR entry state (which takes up one RawPtr word).
192 assert(max_locals == method()->max_locals(), "sanity");
193 assert(max_stack >= method()->max_stack(), "sanity");
194 assert((int)jvms()->endoff() == TypeFunc::Parms + max_locals + max_stack, "sanity");
195 assert((int)jvms()->endoff() == (int)map()->req(), "sanity");
196
197 // Find the start block.
198 Block* osr_block = start_block();
199 assert(osr_block->start() == osr_bci(), "sanity");
200
201 // Set initial BCI.
202 set_parse_bci(osr_block->start());
203
204 // Set initial stack depth.
205 set_sp(osr_block->start_sp());
206
207 // Check bailouts. We currently do not perform on stack replacement
208 // of loops in catch blocks or loops which branch with a non-empty stack.
209 if (sp() != 0) {
224 for (index = 0; index < mcnt; index++) {
225 // Make a BoxLockNode for the monitor.
226 BoxLockNode* osr_box = new BoxLockNode(next_monitor());
227 // Check for bailout after new BoxLockNode
228 if (failing()) { return; }
229
230 // This OSR locking region is unbalanced because it does not have Lock node:
231 // locking was done in Interpreter.
232 // This is similar to Coarsened case when Lock node is eliminated
233 // and as result the region is marked as Unbalanced.
234
235 // Emulate Coarsened state transition from Regular to Unbalanced.
236 osr_box->set_coarsened();
237 osr_box->set_unbalanced();
238
239 Node* box = _gvn.transform(osr_box);
240
241 // Displaced headers and locked objects are interleaved in the
242 // temp OSR buffer. We only copy the locked objects out here.
243 // Fetch the locked object from the OSR temp buffer and copy to our fastlock node.
244 Node *lock_object = fetch_interpreter_state(index*2, T_OBJECT, monitors_addr, osr_buf);
245 // Try and copy the displaced header to the BoxNode
246 Node *displaced_hdr = fetch_interpreter_state((index*2) + 1, T_ADDRESS, monitors_addr, osr_buf);
247
248
249 store_to_memory(control(), box, displaced_hdr, T_ADDRESS, MemNode::unordered);
250
251 // Build a bogus FastLockNode (no code will be generated) and push the
252 // monitor into our debug info.
253 const FastLockNode *flock = _gvn.transform(new FastLockNode( nullptr, lock_object, box ))->as_FastLock();
254 map()->push_monitor(flock);
255
256 // If the lock is our method synchronization lock, tuck it away in
257 // _sync_lock for return and rethrow exit paths.
258 if (index == 0 && method()->is_synchronized()) {
259 _synch_lock = flock;
260 }
261 }
262
263 // Use the raw liveness computation to make sure that unexpected
264 // values don't propagate into the OSR frame.
265 MethodLivenessResult live_locals = method()->liveness_at_bci(osr_bci());
266 if (!live_locals.is_valid()) {
267 // Degenerate or breakpointed method.
295 if (C->log() != nullptr) {
296 C->log()->elem("OSR_mismatch local_index='%d'",index);
297 }
298 set_local(index, null());
299 // and ignore it for the loads
300 continue;
301 }
302 }
303
304 // Filter out TOP, HALF, and BOTTOM. (Cf. ensure_phi.)
305 if (type == Type::TOP || type == Type::HALF) {
306 continue;
307 }
308 // If the type falls to bottom, then this must be a local that
309 // is mixing ints and oops or some such. Forcing it to top
310 // makes it go dead.
311 if (type == Type::BOTTOM) {
312 continue;
313 }
314 // Construct code to access the appropriate local.
315 BasicType bt = type->basic_type();
316 if (type == TypePtr::NULL_PTR) {
317 // Ptr types are mixed together with T_ADDRESS but null is
318 // really for T_OBJECT types so correct it.
319 bt = T_OBJECT;
320 }
321 Node *value = fetch_interpreter_state(index, bt, locals_addr, osr_buf);
322 set_local(index, value);
323 }
324
325 // Extract the needed stack entries from the interpreter frame.
326 for (index = 0; index < sp(); index++) {
327 const Type *type = osr_block->stack_type_at(index);
328 if (type != Type::TOP) {
329 // Currently the compiler bails out when attempting to on stack replace
330 // at a bci with a non-empty stack. We should not reach here.
331 ShouldNotReachHere();
332 }
333 }
334
335 // End the OSR migration
336 make_runtime_call(RC_LEAF, OptoRuntime::osr_end_Type(),
337 CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_end),
338 "OSR_migration_end", TypeRawPtr::BOTTOM,
339 osr_buf);
340
341 // Now that the interpreter state is loaded, make sure it will match
501 // either breakpoint setting or hotswapping of methods may
502 // cause deoptimization.
503 if (C->env()->jvmti_can_hotswap_or_post_breakpoint()) {
504 C->dependencies()->assert_evol_method(method());
505 }
506
507 NOT_PRODUCT(methods_seen++);
508
509 // Do some special top-level things.
510 if (depth() == 1 && C->is_osr_compilation()) {
511 _tf = C->tf(); // the OSR entry type is different
512 _entry_bci = C->entry_bci();
513 _flow = method()->get_osr_flow_analysis(osr_bci());
514 } else {
515 _tf = TypeFunc::make(method());
516 _entry_bci = InvocationEntryBci;
517 _flow = method()->get_flow_analysis();
518 }
519
520 if (_flow->failing()) {
521 assert(false, "type flow analysis failed during parsing");
522 C->record_method_not_compilable(_flow->failure_reason());
523 #ifndef PRODUCT
524 if (PrintOpto && (Verbose || WizardMode)) {
525 if (is_osr_parse()) {
526 tty->print_cr("OSR @%d type flow bailout: %s", _entry_bci, _flow->failure_reason());
527 } else {
528 tty->print_cr("type flow bailout: %s", _flow->failure_reason());
529 }
530 if (Verbose) {
531 method()->print();
532 method()->print_codes();
533 _flow->print();
534 }
535 }
536 #endif
537 }
538
539 #ifdef ASSERT
540 if (depth() == 1) {
541 assert(C->is_osr_compilation() == this->is_osr_parse(), "OSR in sync");
592 load_interpreter_state(osr_buf);
593 } else {
594 set_map(entry_map);
595 do_method_entry();
596 }
597
598 if (depth() == 1 && !failing()) {
599 if (C->clinit_barrier_on_entry()) {
600 // Add check to deoptimize the nmethod once the holder class is fully initialized
601 clinit_deopt();
602 }
603 }
604
605 // Check for bailouts during method entry.
606 if (failing()) {
607 if (log) log->done("parse");
608 C->set_default_node_notes(caller_nn);
609 return;
610 }
611
612 entry_map = map(); // capture any changes performed by method setup code
613 assert(jvms()->endoff() == map()->req(), "map matches JVMS layout");
614
615 // We begin parsing as if we have just encountered a jump to the
616 // method entry.
617 Block* entry_block = start_block();
618 assert(entry_block->start() == (is_osr_parse() ? osr_bci() : 0), "");
619 set_map_clone(entry_map);
620 merge_common(entry_block, entry_block->next_path_num());
621
622 #ifndef PRODUCT
623 BytecodeParseHistogram *parse_histogram_obj = new (C->env()->arena()) BytecodeParseHistogram(this, C);
624 set_parse_histogram( parse_histogram_obj );
625 #endif
626
627 // Parse all the basic blocks.
628 do_all_blocks();
629
630 // Check for bailouts during conversion to graph
631 if (failing()) {
777 void Parse::build_exits() {
778 // make a clone of caller to prevent sharing of side-effects
779 _exits.set_map(_exits.clone_map());
780 _exits.clean_stack(_exits.sp());
781 _exits.sync_jvms();
782
783 RegionNode* region = new RegionNode(1);
784 record_for_igvn(region);
785 gvn().set_type_bottom(region);
786 _exits.set_control(region);
787
788 // Note: iophi and memphi are not transformed until do_exits.
789 Node* iophi = new PhiNode(region, Type::ABIO);
790 Node* memphi = new PhiNode(region, Type::MEMORY, TypePtr::BOTTOM);
791 gvn().set_type_bottom(iophi);
792 gvn().set_type_bottom(memphi);
793 _exits.set_i_o(iophi);
794 _exits.set_all_memory(memphi);
795
796 // Add a return value to the exit state. (Do not push it yet.)
797 if (tf()->range()->cnt() > TypeFunc::Parms) {
798 const Type* ret_type = tf()->range()->field_at(TypeFunc::Parms);
799 if (ret_type->isa_int()) {
800 BasicType ret_bt = method()->return_type()->basic_type();
801 if (ret_bt == T_BOOLEAN ||
802 ret_bt == T_CHAR ||
803 ret_bt == T_BYTE ||
804 ret_bt == T_SHORT) {
805 ret_type = TypeInt::INT;
806 }
807 }
808
809 // Don't "bind" an unloaded return klass to the ret_phi. If the klass
810 // becomes loaded during the subsequent parsing, the loaded and unloaded
811 // types will not join when we transform and push in do_exits().
812 const TypeOopPtr* ret_oop_type = ret_type->isa_oopptr();
813 if (ret_oop_type && !ret_oop_type->is_loaded()) {
814 ret_type = TypeOopPtr::BOTTOM;
815 }
816 int ret_size = type2size[ret_type->basic_type()];
817 Node* ret_phi = new PhiNode(region, ret_type);
818 gvn().set_type_bottom(ret_phi);
819 _exits.ensure_stack(ret_size);
820 assert((int)(tf()->range()->cnt() - TypeFunc::Parms) == ret_size, "good tf range");
821 assert(method()->return_type()->size() == ret_size, "tf agrees w/ method");
822 _exits.set_argument(0, ret_phi); // here is where the parser finds it
823 // Note: ret_phi is not yet pushed, until do_exits.
824 }
825 }
826
827
828 //----------------------------build_start_state-------------------------------
829 // Construct a state which contains only the incoming arguments from an
830 // unknown caller. The method & bci will be null & InvocationEntryBci.
831 JVMState* Compile::build_start_state(StartNode* start, const TypeFunc* tf) {
832 int arg_size = tf->domain()->cnt();
833 int max_size = MAX2(arg_size, (int)tf->range()->cnt());
834 JVMState* jvms = new (this) JVMState(max_size - TypeFunc::Parms);
835 SafePointNode* map = new SafePointNode(max_size, jvms);
836 record_for_igvn(map);
837 assert(arg_size == TypeFunc::Parms + (is_osr_compilation() ? 1 : method()->arg_size()), "correct arg_size");
838 Node_Notes* old_nn = default_node_notes();
839 if (old_nn != nullptr && has_method()) {
840 Node_Notes* entry_nn = old_nn->clone(this);
841 JVMState* entry_jvms = new(this) JVMState(method(), old_nn->jvms());
842 entry_jvms->set_offsets(0);
843 entry_jvms->set_bci(entry_bci());
844 entry_nn->set_jvms(entry_jvms);
845 set_default_node_notes(entry_nn);
846 }
847 uint i;
848 for (i = 0; i < (uint)arg_size; i++) {
849 Node* parm = initial_gvn()->transform(new ParmNode(start, i));
850 map->init_req(i, parm);
851 // Record all these guys for later GVN.
852 record_for_igvn(parm);
853 }
854 for (; i < map->req(); i++) {
855 map->init_req(i, top());
856 }
857 assert(jvms->argoff() == TypeFunc::Parms, "parser gets arguments here");
858 set_default_node_notes(old_nn);
859 jvms->set_map(map);
860 return jvms;
861 }
862
863 //-----------------------------make_node_notes---------------------------------
864 Node_Notes* Parse::make_node_notes(Node_Notes* caller_nn) {
865 if (caller_nn == nullptr) return nullptr;
866 Node_Notes* nn = caller_nn->clone(C);
867 JVMState* caller_jvms = nn->jvms();
868 JVMState* jvms = new (C) JVMState(method(), caller_jvms);
869 jvms->set_offsets(0);
870 jvms->set_bci(_entry_bci);
871 nn->set_jvms(jvms);
872 return nn;
873 }
874
875
876 //--------------------------return_values--------------------------------------
877 void Compile::return_values(JVMState* jvms) {
878 GraphKit kit(jvms);
879 Node* ret = new ReturnNode(TypeFunc::Parms,
880 kit.control(),
881 kit.i_o(),
882 kit.reset_memory(),
883 kit.frameptr(),
884 kit.returnadr());
885 // Add zero or 1 return values
886 int ret_size = tf()->range()->cnt() - TypeFunc::Parms;
887 if (ret_size > 0) {
888 kit.inc_sp(-ret_size); // pop the return value(s)
889 kit.sync_jvms();
890 ret->add_req(kit.argument(0));
891 // Note: The second dummy edge is not needed by a ReturnNode.
892 }
893 // bind it to root
894 root()->add_req(ret);
895 record_for_igvn(ret);
896 initial_gvn()->transform(ret);
897 }
898
899 //------------------------rethrow_exceptions-----------------------------------
900 // Bind all exception states in the list into a single RethrowNode.
901 void Compile::rethrow_exceptions(JVMState* jvms) {
902 GraphKit kit(jvms);
903 if (!kit.has_exceptions()) return; // nothing to generate
904 // Load my combined exception state into the kit, with all phis transformed:
905 SafePointNode* ex_map = kit.combine_and_pop_all_exception_states();
906 Node* ex_oop = kit.use_exception_state(ex_map);
907 RethrowNode* exit = new RethrowNode(kit.control(),
908 kit.i_o(), kit.reset_memory(),
909 kit.frameptr(), kit.returnadr(),
910 // like a return but with exception input
911 ex_oop);
995 // to complete, we force all writes to complete.
996 //
997 // 2. Experimental VM option is used to force the barrier if any field
998 // was written out in the constructor.
999 //
1000 // 3. On processors which are not CPU_MULTI_COPY_ATOMIC (e.g. PPC64),
1001 // support_IRIW_for_not_multiple_copy_atomic_cpu selects that
1002 // MemBarVolatile is used before volatile load instead of after volatile
1003 // store, so there's no barrier after the store.
1004 // We want to guarantee the same behavior as on platforms with total store
1005 // order, although this is not required by the Java memory model.
1006 // In this case, we want to enforce visibility of volatile field
1007 // initializations which are performed in constructors.
1008 // So as with finals, we add a barrier here.
1009 //
1010 // "All bets are off" unless the first publication occurs after a
1011 // normal return from the constructor. We do not attempt to detect
1012 // such unusual early publications. But no barrier is needed on
1013 // exceptional returns, since they cannot publish normally.
1014 //
1015 if (method()->is_object_initializer() &&
1016 (wrote_final() || wrote_stable() ||
1017 (AlwaysSafeConstructors && wrote_fields()) ||
1018 (support_IRIW_for_not_multiple_copy_atomic_cpu && wrote_volatile()))) {
1019 Node* recorded_alloc = alloc_with_final_or_stable();
1020 _exits.insert_mem_bar(UseStoreStoreForCtor ? Op_MemBarStoreStore : Op_MemBarRelease,
1021 recorded_alloc);
1022
1023 // If Memory barrier is created for final fields write
1024 // and allocation node does not escape the initialize method,
1025 // then barrier introduced by allocation node can be removed.
1026 if (DoEscapeAnalysis && (recorded_alloc != nullptr)) {
1027 AllocateNode* alloc = AllocateNode::Ideal_allocation(recorded_alloc);
1028 alloc->compute_MemBar_redundancy(method());
1029 }
1030 if (PrintOpto && (Verbose || WizardMode)) {
1031 method()->print_name();
1032 tty->print_cr(" writes finals/@Stable and needs a memory barrier");
1033 }
1034 }
1035
1036 for (MergeMemStream mms(_exits.merged_memory()); mms.next_non_empty(); ) {
1037 // transform each slice of the original memphi:
1038 mms.set_memory(_gvn.transform(mms.memory()));
1039 }
1040 // Clean up input MergeMems created by transforming the slices
1041 _gvn.transform(_exits.merged_memory());
1042
1043 if (tf()->range()->cnt() > TypeFunc::Parms) {
1044 const Type* ret_type = tf()->range()->field_at(TypeFunc::Parms);
1045 Node* ret_phi = _gvn.transform( _exits.argument(0) );
1046 if (!_exits.control()->is_top() && _gvn.type(ret_phi)->empty()) {
1047 // If the type we set for the ret_phi in build_exits() is too optimistic and
1048 // the ret_phi is top now, there's an extremely small chance that it may be due to class
1049 // loading. It could also be due to an error, so mark this method as not compilable because
1050 // otherwise this could lead to an infinite compile loop.
1051 // In any case, this code path is rarely (and never in my testing) reached.
1052 C->record_method_not_compilable("Can't determine return type.");
1053 return;
1054 }
1055 if (ret_type->isa_int()) {
1056 BasicType ret_bt = method()->return_type()->basic_type();
1057 ret_phi = mask_int_value(ret_phi, ret_bt, &_gvn);
1058 }
1059 _exits.push_node(ret_type->basic_type(), ret_phi);
1060 }
1061
1062 // Note: Logic for creating and optimizing the ReturnNode is in Compile.
1063
1064 // Unlock along the exceptional paths.
1118
1119 //-----------------------------create_entry_map-------------------------------
1120 // Initialize our parser map to contain the types at method entry.
1121 // For OSR, the map contains a single RawPtr parameter.
1122 // Initial monitor locking for sync. methods is performed by do_method_entry.
1123 SafePointNode* Parse::create_entry_map() {
1124 // Check for really stupid bail-out cases.
1125 uint len = TypeFunc::Parms + method()->max_locals() + method()->max_stack();
1126 if (len >= 32760) {
1127 // Bailout expected, this is a very rare edge case.
1128 C->record_method_not_compilable("too many local variables");
1129 return nullptr;
1130 }
1131
1132 // clear current replaced nodes that are of no use from here on (map was cloned in build_exits).
1133 _caller->map()->delete_replaced_nodes();
1134
1135 // If this is an inlined method, we may have to do a receiver null check.
1136 if (_caller->has_method() && is_normal_parse() && !method()->is_static()) {
1137 GraphKit kit(_caller);
1138 kit.null_check_receiver_before_call(method());
1139 _caller = kit.transfer_exceptions_into_jvms();
1140 if (kit.stopped()) {
1141 _exits.add_exception_states_from(_caller);
1142 _exits.set_jvms(_caller);
1143 return nullptr;
1144 }
1145 }
1146
1147 assert(method() != nullptr, "parser must have a method");
1148
1149 // Create an initial safepoint to hold JVM state during parsing
1150 JVMState* jvms = new (C) JVMState(method(), _caller->has_method() ? _caller : nullptr);
1151 set_map(new SafePointNode(len, jvms));
1152 jvms->set_map(map());
1153 record_for_igvn(map());
1154 assert(jvms->endoff() == len, "correct jvms sizing");
1155
1156 SafePointNode* inmap = _caller->map();
1157 assert(inmap != nullptr, "must have inmap");
1158 // In case of null check on receiver above
1159 map()->transfer_replaced_nodes_from(inmap, _new_idx);
1160
1161 uint i;
1162
1163 // Pass thru the predefined input parameters.
1164 for (i = 0; i < TypeFunc::Parms; i++) {
1165 map()->init_req(i, inmap->in(i));
1166 }
1167
1168 if (depth() == 1) {
1169 assert(map()->memory()->Opcode() == Op_Parm, "");
1170 // Insert the memory aliasing node
1171 set_all_memory(reset_memory());
1172 }
1173 assert(merged_memory(), "");
1174
1175 // Now add the locals which are initially bound to arguments:
1176 uint arg_size = tf()->domain()->cnt();
1177 ensure_stack(arg_size - TypeFunc::Parms); // OSR methods have funny args
1178 for (i = TypeFunc::Parms; i < arg_size; i++) {
1179 map()->init_req(i, inmap->argument(_caller, i - TypeFunc::Parms));
1180 }
1181
1182 // Clear out the rest of the map (locals and stack)
1183 for (i = arg_size; i < len; i++) {
1184 map()->init_req(i, top());
1185 }
1186
1187 SafePointNode* entry_map = stop();
1188 return entry_map;
1189 }
1190
1191 //-----------------------------do_method_entry--------------------------------
1192 // Emit any code needed in the pseudo-block before BCI zero.
1193 // The main thing to do is lock the receiver of a synchronized method.
1194 void Parse::do_method_entry() {
1195 set_parse_bci(InvocationEntryBci); // Pseudo-BCP
1196 set_sp(0); // Java Stack Pointer
1230
1231 // If the method is synchronized, we need to construct a lock node, attach
1232 // it to the Start node, and pin it there.
1233 if (method()->is_synchronized()) {
1234 // Insert a FastLockNode right after the Start which takes as arguments
1235 // the current thread pointer, the "this" pointer & the address of the
1236 // stack slot pair used for the lock. The "this" pointer is a projection
1237 // off the start node, but the locking spot has to be constructed by
1238 // creating a ConLNode of 0, and boxing it with a BoxLockNode. The BoxLockNode
1239 // becomes the second argument to the FastLockNode call. The
1240 // FastLockNode becomes the new control parent to pin it to the start.
1241
1242 // Setup Object Pointer
1243 Node *lock_obj = nullptr;
1244 if (method()->is_static()) {
1245 ciInstance* mirror = _method->holder()->java_mirror();
1246 const TypeInstPtr *t_lock = TypeInstPtr::make(mirror);
1247 lock_obj = makecon(t_lock);
1248 } else { // Else pass the "this" pointer,
1249 lock_obj = local(0); // which is Parm0 from StartNode
1250 }
1251 // Clear out dead values from the debug info.
1252 kill_dead_locals();
1253 // Build the FastLockNode
1254 _synch_lock = shared_lock(lock_obj);
1255 // Check for bailout in shared_lock
1256 if (failing()) { return; }
1257 }
1258
1259 // Feed profiling data for parameters to the type system so it can
1260 // propagate it as speculative types
1261 record_profiled_parameters_for_speculation();
1262 }
1263
1264 //------------------------------init_blocks------------------------------------
1265 // Initialize our parser map to contain the types/monitors at method entry.
1266 void Parse::init_blocks() {
1267 // Create the blocks.
1268 _block_count = flow()->block_count();
1269 _blocks = NEW_RESOURCE_ARRAY(Block, _block_count);
1665 //--------------------handle_missing_successor---------------------------------
1666 void Parse::handle_missing_successor(int target_bci) {
1667 #ifndef PRODUCT
1668 Block* b = block();
1669 int trap_bci = b->flow()->has_trap()? b->flow()->trap_bci(): -1;
1670 tty->print_cr("### Missing successor at bci:%d for block #%d (trap_bci:%d)", target_bci, b->rpo(), trap_bci);
1671 #endif
1672 ShouldNotReachHere();
1673 }
1674
1675 //--------------------------merge_common---------------------------------------
1676 void Parse::merge_common(Parse::Block* target, int pnum) {
1677 if (TraceOptoParse) {
1678 tty->print("Merging state at block #%d bci:%d", target->rpo(), target->start());
1679 }
1680
1681 // Zap extra stack slots to top
1682 assert(sp() == target->start_sp(), "");
1683 clean_stack(sp());
1684
1685 if (!target->is_merged()) { // No prior mapping at this bci
1686 if (TraceOptoParse) { tty->print(" with empty state"); }
1687
1688 // If this path is dead, do not bother capturing it as a merge.
1689 // It is "as if" we had 1 fewer predecessors from the beginning.
1690 if (stopped()) {
1691 if (TraceOptoParse) tty->print_cr(", but path is dead and doesn't count");
1692 return;
1693 }
1694
1695 // Make a region if we know there are multiple or unpredictable inputs.
1696 // (Also, if this is a plain fall-through, we might see another region,
1697 // which must not be allowed into this block's map.)
1698 if (pnum > PhiNode::Input // Known multiple inputs.
1699 || target->is_handler() // These have unpredictable inputs.
1700 || target->is_loop_head() // Known multiple inputs
1701 || control()->is_Region()) { // We must hide this guy.
1702
1703 int current_bci = bci();
1704 set_parse_bci(target->start()); // Set target bci
1719 record_for_igvn(r);
1720 // zap all inputs to null for debugging (done in Node(uint) constructor)
1721 // for (int j = 1; j < edges+1; j++) { r->init_req(j, nullptr); }
1722 r->init_req(pnum, control());
1723 set_control(r);
1724 target->copy_irreducible_status_to(r, jvms());
1725 set_parse_bci(current_bci); // Restore bci
1726 }
1727
1728 // Convert the existing Parser mapping into a mapping at this bci.
1729 store_state_to(target);
1730 assert(target->is_merged(), "do not come here twice");
1731
1732 } else { // Prior mapping at this bci
1733 if (TraceOptoParse) { tty->print(" with previous state"); }
1734 #ifdef ASSERT
1735 if (target->is_SEL_head()) {
1736 target->mark_merged_backedge(block());
1737 }
1738 #endif
1739 // We must not manufacture more phis if the target is already parsed.
1740 bool nophi = target->is_parsed();
1741
1742 SafePointNode* newin = map();// Hang on to incoming mapping
1743 Block* save_block = block(); // Hang on to incoming block;
1744 load_state_from(target); // Get prior mapping
1745
1746 assert(newin->jvms()->locoff() == jvms()->locoff(), "JVMS layouts agree");
1747 assert(newin->jvms()->stkoff() == jvms()->stkoff(), "JVMS layouts agree");
1748 assert(newin->jvms()->monoff() == jvms()->monoff(), "JVMS layouts agree");
1749 assert(newin->jvms()->endoff() == jvms()->endoff(), "JVMS layouts agree");
1750
1751 // Iterate over my current mapping and the old mapping.
1752 // Where different, insert Phi functions.
1753 // Use any existing Phi functions.
1754 assert(control()->is_Region(), "must be merging to a region");
1755 RegionNode* r = control()->as_Region();
1756
1757 // Compute where to merge into
1758 // Merge incoming control path
1759 r->init_req(pnum, newin->control());
1760
1761 if (pnum == 1) { // Last merge for this Region?
1762 if (!block()->flow()->is_irreducible_loop_secondary_entry()) {
1763 Node* result = _gvn.transform(r);
1764 if (r != result && TraceOptoParse) {
1765 tty->print_cr("Block #%d replace %d with %d", block()->rpo(), r->_idx, result->_idx);
1766 }
1767 }
1768 record_for_igvn(r);
1769 }
1770
1771 // Update all the non-control inputs to map:
1772 assert(TypeFunc::Parms == newin->jvms()->locoff(), "parser map should contain only youngest jvms");
1773 bool check_elide_phi = target->is_SEL_backedge(save_block);
1774 for (uint j = 1; j < newin->req(); j++) {
1775 Node* m = map()->in(j); // Current state of target.
1776 Node* n = newin->in(j); // Incoming change to target state.
1777 PhiNode* phi;
1778 if (m->is_Phi() && m->as_Phi()->region() == r)
1779 phi = m->as_Phi();
1780 else
1781 phi = nullptr;
1782 if (m != n) { // Different; must merge
1783 switch (j) {
1784 // Frame pointer and Return Address never changes
1785 case TypeFunc::FramePtr:// Drop m, use the original value
1786 case TypeFunc::ReturnAdr:
1787 break;
1788 case TypeFunc::Memory: // Merge inputs to the MergeMem node
1789 assert(phi == nullptr, "the merge contains phis, not vice versa");
1790 merge_memory_edges(n->as_MergeMem(), pnum, nophi);
1791 continue;
1792 default: // All normal stuff
1793 if (phi == nullptr) {
1794 const JVMState* jvms = map()->jvms();
1795 if (EliminateNestedLocks &&
1796 jvms->is_mon(j) && jvms->is_monitor_box(j)) {
1797 // BoxLock nodes are not commoning when EliminateNestedLocks is on.
1798 // Use old BoxLock node as merged box.
1799 assert(newin->jvms()->is_monitor_box(j), "sanity");
1800 // This assert also tests that nodes are BoxLock.
1801 assert(BoxLockNode::same_slot(n, m), "sanity");
1808 // Incremental Inlining before EA and Macro nodes elimination.
1809 //
1810 // Incremental Inlining is executed after IGVN optimizations
1811 // during which BoxLock can be marked as Coarsened.
1812 old_box->set_coarsened(); // Verifies state
1813 old_box->set_unbalanced();
1814 }
1815 C->gvn_replace_by(n, m);
1816 } else if (!check_elide_phi || !target->can_elide_SEL_phi(j)) {
1817 phi = ensure_phi(j, nophi);
1818 }
1819 }
1820 break;
1821 }
1822 }
1823 // At this point, n might be top if:
1824 // - there is no phi (because TypeFlow detected a conflict), or
1825 // - the corresponding control edges is top (a dead incoming path)
1826 // It is a bug if we create a phi which sees a garbage value on a live path.
1827
1828 if (phi != nullptr) {
1829 assert(n != top() || r->in(pnum) == top(), "live value must not be garbage");
1830 assert(phi->region() == r, "");
1831 phi->set_req(pnum, n); // Then add 'n' to the merge
1832 if (pnum == PhiNode::Input) {
1833 // Last merge for this Phi.
1834 // So far, Phis have had a reasonable type from ciTypeFlow.
1835 // Now _gvn will join that with the meet of current inputs.
1836 // BOTTOM is never permissible here, 'cause pessimistically
1837 // Phis of pointers cannot lose the basic pointer type.
1838 debug_only(const Type* bt1 = phi->bottom_type());
1839 assert(bt1 != Type::BOTTOM, "should not be building conflict phis");
1840 map()->set_req(j, _gvn.transform(phi));
1841 debug_only(const Type* bt2 = phi->bottom_type());
1842 assert(bt2->higher_equal_speculative(bt1), "must be consistent with type-flow");
1843 record_for_igvn(phi);
1844 }
1845 }
1846 } // End of for all values to be merged
1847
1848 if (pnum == PhiNode::Input &&
1849 !r->in(0)) { // The occasional useless Region
1850 assert(control() == r, "");
1851 set_control(r->nonnull_req());
1852 }
1853
1854 map()->merge_replaced_nodes_with(newin);
1855
1856 // newin has been subsumed into the lazy merge, and is now dead.
1857 set_block(save_block);
1858
1859 stop(); // done with this guy, for now
1860 }
1861
1862 if (TraceOptoParse) {
1863 tty->print_cr(" on path %d", pnum);
1864 }
1865
1866 // Done with this parser state.
1867 assert(stopped(), "");
1868 }
1869
1981
1982 // Add new path to the region.
1983 uint pnum = r->req();
1984 r->add_req(nullptr);
1985
1986 for (uint i = 1; i < map->req(); i++) {
1987 Node* n = map->in(i);
1988 if (i == TypeFunc::Memory) {
1989 // Ensure a phi on all currently known memories.
1990 for (MergeMemStream mms(n->as_MergeMem()); mms.next_non_empty(); ) {
1991 Node* phi = mms.memory();
1992 if (phi->is_Phi() && phi->as_Phi()->region() == r) {
1993 assert(phi->req() == pnum, "must be same size as region");
1994 phi->add_req(nullptr);
1995 }
1996 }
1997 } else {
1998 if (n->is_Phi() && n->as_Phi()->region() == r) {
1999 assert(n->req() == pnum, "must be same size as region");
2000 n->add_req(nullptr);
2001 }
2002 }
2003 }
2004
2005 return pnum;
2006 }
2007
2008 //------------------------------ensure_phi-------------------------------------
2009 // Turn the idx'th entry of the current map into a Phi
2010 PhiNode *Parse::ensure_phi(int idx, bool nocreate) {
2011 SafePointNode* map = this->map();
2012 Node* region = map->control();
2013 assert(region->is_Region(), "");
2014
2015 Node* o = map->in(idx);
2016 assert(o != nullptr, "");
2017
2018 if (o == top()) return nullptr; // TOP always merges into TOP
2019
2020 if (o->is_Phi() && o->as_Phi()->region() == region) {
2021 return o->as_Phi();
2022 }
2023
2024 // Now use a Phi here for merging
2025 assert(!nocreate, "Cannot build a phi for a block already parsed.");
2026 const JVMState* jvms = map->jvms();
2027 const Type* t = nullptr;
2028 if (jvms->is_loc(idx)) {
2029 t = block()->local_type_at(idx - jvms->locoff());
2030 } else if (jvms->is_stk(idx)) {
2031 t = block()->stack_type_at(idx - jvms->stkoff());
2032 } else if (jvms->is_mon(idx)) {
2033 assert(!jvms->is_monitor_box(idx), "no phis for boxes");
2034 t = TypeInstPtr::BOTTOM; // this is sufficient for a lock object
2035 } else if ((uint)idx < TypeFunc::Parms) {
2036 t = o->bottom_type(); // Type::RETURN_ADDRESS or such-like.
2037 } else {
2038 assert(false, "no type information for this phi");
2039 }
2040
2041 // If the type falls to bottom, then this must be a local that
2042 // is mixing ints and oops or some such. Forcing it to top
2043 // makes it go dead.
2044 if (t == Type::BOTTOM) {
2045 map->set_req(idx, top());
2046 return nullptr;
2047 }
2048
2049 // Do not create phis for top either.
2050 // A top on a non-null control flow must be an unused even after the.phi.
2051 if (t == Type::TOP || t == Type::HALF) {
2052 map->set_req(idx, top());
2053 return nullptr;
2054 }
2055
2056 PhiNode* phi = PhiNode::make(region, o, t);
2057 gvn().set_type(phi, t);
2058 if (C->do_escape_analysis()) record_for_igvn(phi);
2059 map->set_req(idx, phi);
2060 return phi;
2061 }
2062
2063 //--------------------------ensure_memory_phi----------------------------------
2064 // Turn the idx'th slice of the current memory into a Phi
2065 PhiNode *Parse::ensure_memory_phi(int idx, bool nocreate) {
2066 MergeMemNode* mem = merged_memory();
2067 Node* region = control();
2068 assert(region->is_Region(), "");
2069
2070 Node *o = (idx == Compile::AliasIdxBot)? mem->base_memory(): mem->memory_at(idx);
2071 assert(o != nullptr && o != top(), "");
2072
2073 PhiNode* phi;
2074 if (o->is_Phi() && o->as_Phi()->region() == region) {
2075 phi = o->as_Phi();
2076 if (phi == mem->base_memory() && idx >= Compile::AliasIdxRaw) {
2077 // clone the shared base memory phi to make a new memory split
2078 assert(!nocreate, "Cannot build a phi for a block already parsed.");
2079 const Type* t = phi->bottom_type();
2080 const TypePtr* adr_type = C->get_adr_type(idx);
2170 // Add check to deoptimize once holder klass is fully initialized.
2171 void Parse::clinit_deopt() {
2172 assert(C->has_method(), "only for normal compilations");
2173 assert(depth() == 1, "only for main compiled method");
2174 assert(is_normal_parse(), "no barrier needed on osr entry");
2175 assert(!method()->holder()->is_not_initialized(), "initialization should have been started");
2176
2177 set_parse_bci(0);
2178
2179 Node* holder = makecon(TypeKlassPtr::make(method()->holder(), Type::trust_interfaces));
2180 guard_klass_being_initialized(holder);
2181 }
2182
2183 //------------------------------return_current---------------------------------
2184 // Append current _map to _exit_return
2185 void Parse::return_current(Node* value) {
2186 if (method()->intrinsic_id() == vmIntrinsics::_Object_init) {
2187 call_register_finalizer();
2188 }
2189
2190 // Do not set_parse_bci, so that return goo is credited to the return insn.
2191 set_bci(InvocationEntryBci);
2192 if (method()->is_synchronized() && GenerateSynchronizationCode) {
2193 shared_unlock(_synch_lock->box_node(), _synch_lock->obj_node());
2194 }
2195 if (C->env()->dtrace_method_probes()) {
2196 make_dtrace_method_exit(method());
2197 }
2198 SafePointNode* exit_return = _exits.map();
2199 exit_return->in( TypeFunc::Control )->add_req( control() );
2200 exit_return->in( TypeFunc::I_O )->add_req( i_o () );
2201 Node *mem = exit_return->in( TypeFunc::Memory );
2202 for (MergeMemStream mms(mem->as_MergeMem(), merged_memory()); mms.next_non_empty2(); ) {
2203 if (mms.is_empty()) {
2204 // get a copy of the base memory, and patch just this one input
2205 const TypePtr* adr_type = mms.adr_type(C);
2206 Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type);
2207 assert(phi->as_Phi()->region() == mms.base_memory()->in(0), "");
2208 gvn().set_type_bottom(phi);
2209 phi->del_req(phi->req()-1); // prepare to re-patch
2210 mms.set_memory(phi);
2211 }
2212 mms.memory()->add_req(mms.memory2());
2213 }
2214
2215 // frame pointer is always same, already captured
2216 if (value != nullptr) {
2217 // If returning oops to an interface-return, there is a silent free
2218 // cast from oop to interface allowed by the Verifier. Make it explicit
2219 // here.
2220 Node* phi = _exits.argument(0);
2221 phi->add_req(value);
2222 }
2223
2224 if (_first_return) {
2225 _exits.map()->transfer_replaced_nodes_from(map(), _new_idx);
2226 _first_return = false;
2227 } else {
2228 _exits.map()->merge_replaced_nodes_with(map());
2229 }
2230
2231 stop_and_kill_map(); // This CFG path dies here
2232 }
2233
2234
2235 //------------------------------add_safepoint----------------------------------
2236 void Parse::add_safepoint() {
2237 uint parms = TypeFunc::Parms+1;
2238
2239 // Clear out dead values from the debug info.
2240 kill_dead_locals();
2241
2242 // Clone the JVM State
2243 SafePointNode *sfpnt = new SafePointNode(parms, nullptr);
|
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "compiler/compileLog.hpp"
26 #include "interpreter/linkResolver.hpp"
27 #include "memory/resourceArea.hpp"
28 #include "oops/method.hpp"
29 #include "opto/addnode.hpp"
30 #include "opto/c2compiler.hpp"
31 #include "opto/castnode.hpp"
32 #include "opto/convertnode.hpp"
33 #include "opto/idealGraphPrinter.hpp"
34 #include "opto/inlinetypenode.hpp"
35 #include "opto/locknode.hpp"
36 #include "opto/memnode.hpp"
37 #include "opto/opaquenode.hpp"
38 #include "opto/parse.hpp"
39 #include "opto/rootnode.hpp"
40 #include "opto/runtime.hpp"
41 #include "opto/type.hpp"
42 #include "runtime/handles.inline.hpp"
43 #include "runtime/safepointMechanism.hpp"
44 #include "runtime/sharedRuntime.hpp"
45 #include "utilities/bitMap.inline.hpp"
46 #include "utilities/copy.hpp"
47
48 // Static array so we can figure out which bytecodes stop us from compiling
49 // the most. Some of the non-static variables are needed in bytecodeInfo.cpp
50 // and eventually should be encapsulated in a proper class (gri 8/18/98).
51
52 #ifndef PRODUCT
53 uint nodes_created = 0;
54 uint methods_parsed = 0;
86 }
87 if (all_null_checks_found) {
88 tty->print_cr("%u made implicit (%2u%%)", implicit_null_checks,
89 (100*implicit_null_checks)/all_null_checks_found);
90 }
91 if (SharedRuntime::_implicit_null_throws) {
92 tty->print_cr("%u implicit null exceptions at runtime",
93 SharedRuntime::_implicit_null_throws);
94 }
95
96 if (PrintParseStatistics && BytecodeParseHistogram::initialized()) {
97 BytecodeParseHistogram::print();
98 }
99 }
100 #endif
101
102 //------------------------------ON STACK REPLACEMENT---------------------------
103
104 // Construct a node which can be used to get incoming state for
105 // on stack replacement.
106 Node* Parse::fetch_interpreter_state(int index,
107 const Type* type,
108 Node* local_addrs,
109 Node* local_addrs_base) {
110 BasicType bt = type->basic_type();
111 if (type == TypePtr::NULL_PTR) {
112 // Ptr types are mixed together with T_ADDRESS but nullptr is
113 // really for T_OBJECT types so correct it.
114 bt = T_OBJECT;
115 }
116 Node *mem = memory(Compile::AliasIdxRaw);
117 Node *adr = basic_plus_adr( local_addrs_base, local_addrs, -index*wordSize );
118 Node *ctl = control();
119
120 // Very similar to LoadNode::make, except we handle un-aligned longs and
121 // doubles on Sparc. Intel can handle them just fine directly.
122 Node *l = nullptr;
123 switch (bt) { // Signature is flattened
124 case T_INT: l = new LoadINode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeInt::INT, MemNode::unordered); break;
125 case T_FLOAT: l = new LoadFNode(ctl, mem, adr, TypeRawPtr::BOTTOM, Type::FLOAT, MemNode::unordered); break;
126 case T_ADDRESS: l = new LoadPNode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeRawPtr::BOTTOM, MemNode::unordered); break;
127 case T_OBJECT: l = new LoadPNode(ctl, mem, adr, TypeRawPtr::BOTTOM, TypeInstPtr::BOTTOM, MemNode::unordered); break;
128 case T_LONG:
129 case T_DOUBLE: {
130 // Since arguments are in reverse order, the argument address 'adr'
131 // refers to the back half of the long/double. Recompute adr.
132 adr = basic_plus_adr(local_addrs_base, local_addrs, -(index+1)*wordSize);
133 if (Matcher::misaligned_doubles_ok) {
134 l = (bt == T_DOUBLE)
135 ? (Node*)new LoadDNode(ctl, mem, adr, TypeRawPtr::BOTTOM, Type::DOUBLE, MemNode::unordered)
137 } else {
138 l = (bt == T_DOUBLE)
139 ? (Node*)new LoadD_unalignedNode(ctl, mem, adr, TypeRawPtr::BOTTOM, MemNode::unordered)
140 : (Node*)new LoadL_unalignedNode(ctl, mem, adr, TypeRawPtr::BOTTOM, MemNode::unordered);
141 }
142 break;
143 }
144 default: ShouldNotReachHere();
145 }
146 return _gvn.transform(l);
147 }
148
149 // Helper routine to prevent the interpreter from handing
150 // unexpected typestate to an OSR method.
151 // The Node l is a value newly dug out of the interpreter frame.
152 // The type is the type predicted by ciTypeFlow. Note that it is
153 // not a general type, but can only come from Type::get_typeflow_type.
154 // The safepoint is a map which will feed an uncommon trap.
155 Node* Parse::check_interpreter_type(Node* l, const Type* type,
156 SafePointNode* &bad_type_exit) {
157 const TypeOopPtr* tp = type->isa_oopptr();
158
159 // TypeFlow may assert null-ness if a type appears unloaded.
160 if (type == TypePtr::NULL_PTR ||
161 (tp != nullptr && !tp->is_loaded())) {
162 // Value must be null, not a real oop.
163 Node* chk = _gvn.transform( new CmpPNode(l, null()) );
164 Node* tst = _gvn.transform( new BoolNode(chk, BoolTest::eq) );
165 IfNode* iff = create_and_map_if(control(), tst, PROB_MAX, COUNT_UNKNOWN);
166 set_control(_gvn.transform( new IfTrueNode(iff) ));
167 Node* bad_type = _gvn.transform( new IfFalseNode(iff) );
168 bad_type_exit->control()->add_req(bad_type);
169 l = null();
170 }
171
172 // Typeflow can also cut off paths from the CFG, based on
173 // types which appear unloaded, or call sites which appear unlinked.
174 // When paths are cut off, values at later merge points can rise
175 // toward more specific classes. Make sure these specific classes
176 // are still in effect.
177 if (tp != nullptr && !tp->is_same_java_type_as(TypeInstPtr::BOTTOM)) {
178 // TypeFlow asserted a specific object type. Value must have that type.
179 Node* bad_type_ctrl = nullptr;
180 if (tp->is_inlinetypeptr() && !tp->maybe_null()) {
181 // Check inline types for null here to prevent checkcast from adding an
182 // exception state before the bytecode entry (use 'bad_type_ctrl' instead).
183 l = null_check_oop(l, &bad_type_ctrl);
184 bad_type_exit->control()->add_req(bad_type_ctrl);
185 }
186 l = gen_checkcast(l, makecon(tp->as_klass_type()->cast_to_exactness(true)), &bad_type_ctrl);
187 bad_type_exit->control()->add_req(bad_type_ctrl);
188 }
189
190 assert(_gvn.type(l)->higher_equal(type), "must constrain OSR typestate");
191 return l;
192 }
193
194 // Helper routine which sets up elements of the initial parser map when
195 // performing a parse for on stack replacement. Add values into map.
196 // The only parameter contains the address of a interpreter arguments.
197 void Parse::load_interpreter_state(Node* osr_buf) {
198 int index;
199 int max_locals = jvms()->loc_size();
200 int max_stack = jvms()->stk_size();
201
202 // Mismatch between method and jvms can occur since map briefly held
203 // an OSR entry state (which takes up one RawPtr word).
204 assert(max_locals == method()->max_locals(), "sanity");
205 assert(max_stack >= method()->max_stack(), "sanity");
206 assert((int)jvms()->endoff() == TypeFunc::Parms + max_locals + max_stack, "sanity");
207 assert((int)jvms()->endoff() == (int)map()->req(), "sanity");
208
209 // Find the start block.
210 Block* osr_block = start_block();
211 assert(osr_block->start() == osr_bci(), "sanity");
212
213 // Set initial BCI.
214 set_parse_bci(osr_block->start());
215
216 // Set initial stack depth.
217 set_sp(osr_block->start_sp());
218
219 // Check bailouts. We currently do not perform on stack replacement
220 // of loops in catch blocks or loops which branch with a non-empty stack.
221 if (sp() != 0) {
236 for (index = 0; index < mcnt; index++) {
237 // Make a BoxLockNode for the monitor.
238 BoxLockNode* osr_box = new BoxLockNode(next_monitor());
239 // Check for bailout after new BoxLockNode
240 if (failing()) { return; }
241
242 // This OSR locking region is unbalanced because it does not have Lock node:
243 // locking was done in Interpreter.
244 // This is similar to Coarsened case when Lock node is eliminated
245 // and as result the region is marked as Unbalanced.
246
247 // Emulate Coarsened state transition from Regular to Unbalanced.
248 osr_box->set_coarsened();
249 osr_box->set_unbalanced();
250
251 Node* box = _gvn.transform(osr_box);
252
253 // Displaced headers and locked objects are interleaved in the
254 // temp OSR buffer. We only copy the locked objects out here.
255 // Fetch the locked object from the OSR temp buffer and copy to our fastlock node.
256 Node* lock_object = fetch_interpreter_state(index*2, Type::get_const_basic_type(T_OBJECT), monitors_addr, osr_buf);
257 // Try and copy the displaced header to the BoxNode
258 Node* displaced_hdr = fetch_interpreter_state((index*2) + 1, Type::get_const_basic_type(T_ADDRESS), monitors_addr, osr_buf);
259
260 store_to_memory(control(), box, displaced_hdr, T_ADDRESS, MemNode::unordered);
261
262 // Build a bogus FastLockNode (no code will be generated) and push the
263 // monitor into our debug info.
264 const FastLockNode *flock = _gvn.transform(new FastLockNode( nullptr, lock_object, box ))->as_FastLock();
265 map()->push_monitor(flock);
266
267 // If the lock is our method synchronization lock, tuck it away in
268 // _sync_lock for return and rethrow exit paths.
269 if (index == 0 && method()->is_synchronized()) {
270 _synch_lock = flock;
271 }
272 }
273
274 // Use the raw liveness computation to make sure that unexpected
275 // values don't propagate into the OSR frame.
276 MethodLivenessResult live_locals = method()->liveness_at_bci(osr_bci());
277 if (!live_locals.is_valid()) {
278 // Degenerate or breakpointed method.
306 if (C->log() != nullptr) {
307 C->log()->elem("OSR_mismatch local_index='%d'",index);
308 }
309 set_local(index, null());
310 // and ignore it for the loads
311 continue;
312 }
313 }
314
315 // Filter out TOP, HALF, and BOTTOM. (Cf. ensure_phi.)
316 if (type == Type::TOP || type == Type::HALF) {
317 continue;
318 }
319 // If the type falls to bottom, then this must be a local that
320 // is mixing ints and oops or some such. Forcing it to top
321 // makes it go dead.
322 if (type == Type::BOTTOM) {
323 continue;
324 }
325 // Construct code to access the appropriate local.
326 Node* value = fetch_interpreter_state(index, type, locals_addr, osr_buf);
327 set_local(index, value);
328 }
329
330 // Extract the needed stack entries from the interpreter frame.
331 for (index = 0; index < sp(); index++) {
332 const Type *type = osr_block->stack_type_at(index);
333 if (type != Type::TOP) {
334 // Currently the compiler bails out when attempting to on stack replace
335 // at a bci with a non-empty stack. We should not reach here.
336 ShouldNotReachHere();
337 }
338 }
339
340 // End the OSR migration
341 make_runtime_call(RC_LEAF, OptoRuntime::osr_end_Type(),
342 CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_end),
343 "OSR_migration_end", TypeRawPtr::BOTTOM,
344 osr_buf);
345
346 // Now that the interpreter state is loaded, make sure it will match
506 // either breakpoint setting or hotswapping of methods may
507 // cause deoptimization.
508 if (C->env()->jvmti_can_hotswap_or_post_breakpoint()) {
509 C->dependencies()->assert_evol_method(method());
510 }
511
512 NOT_PRODUCT(methods_seen++);
513
514 // Do some special top-level things.
515 if (depth() == 1 && C->is_osr_compilation()) {
516 _tf = C->tf(); // the OSR entry type is different
517 _entry_bci = C->entry_bci();
518 _flow = method()->get_osr_flow_analysis(osr_bci());
519 } else {
520 _tf = TypeFunc::make(method());
521 _entry_bci = InvocationEntryBci;
522 _flow = method()->get_flow_analysis();
523 }
524
525 if (_flow->failing()) {
526 // TODO Adding a trap due to an unloaded return type in ciTypeFlow::StateVector::do_invoke
527 // can lead to this. Re-enable once 8284443 is fixed.
528 //assert(false, "type flow analysis failed during parsing");
529 C->record_method_not_compilable(_flow->failure_reason());
530 #ifndef PRODUCT
531 if (PrintOpto && (Verbose || WizardMode)) {
532 if (is_osr_parse()) {
533 tty->print_cr("OSR @%d type flow bailout: %s", _entry_bci, _flow->failure_reason());
534 } else {
535 tty->print_cr("type flow bailout: %s", _flow->failure_reason());
536 }
537 if (Verbose) {
538 method()->print();
539 method()->print_codes();
540 _flow->print();
541 }
542 }
543 #endif
544 }
545
546 #ifdef ASSERT
547 if (depth() == 1) {
548 assert(C->is_osr_compilation() == this->is_osr_parse(), "OSR in sync");
599 load_interpreter_state(osr_buf);
600 } else {
601 set_map(entry_map);
602 do_method_entry();
603 }
604
605 if (depth() == 1 && !failing()) {
606 if (C->clinit_barrier_on_entry()) {
607 // Add check to deoptimize the nmethod once the holder class is fully initialized
608 clinit_deopt();
609 }
610 }
611
612 // Check for bailouts during method entry.
613 if (failing()) {
614 if (log) log->done("parse");
615 C->set_default_node_notes(caller_nn);
616 return;
617 }
618
619 // Handle inline type arguments
620 int arg_size = method()->arg_size();
621 for (int i = 0; i < arg_size; i++) {
622 Node* parm = local(i);
623 const Type* t = _gvn.type(parm);
624 if (t->is_inlinetypeptr()) {
625 // Create InlineTypeNode from the oop and replace the parameter
626 bool is_larval = (i == 0) && method()->is_object_constructor() && !method()->holder()->is_java_lang_Object();
627 Node* vt = InlineTypeNode::make_from_oop(this, parm, t->inline_klass(), is_larval);
628 replace_in_map(parm, vt);
629 } else if (UseTypeSpeculation && (i == (arg_size - 1)) && !is_osr_parse() && method()->has_vararg() &&
630 t->isa_aryptr() != nullptr && !t->is_aryptr()->is_null_free() && !t->is_aryptr()->is_flat() &&
631 (!t->is_aryptr()->is_not_null_free() || !t->is_aryptr()->is_not_flat())) {
632 // Speculate on varargs Object array being not null-free and not flat
633 const TypePtr* spec_type = t->speculative();
634 spec_type = (spec_type != nullptr && spec_type->isa_aryptr() != nullptr) ? spec_type : t->is_aryptr();
635 spec_type = spec_type->remove_speculative()->is_aryptr()->cast_to_not_null_free()->cast_to_not_flat();
636 spec_type = TypeOopPtr::make(TypePtr::BotPTR, Type::Offset::bottom, TypeOopPtr::InstanceBot, spec_type);
637 Node* cast = _gvn.transform(new CheckCastPPNode(control(), parm, t->join_speculative(spec_type)));
638 replace_in_map(parm, cast);
639 }
640 }
641
642 entry_map = map(); // capture any changes performed by method setup code
643 assert(jvms()->endoff() == map()->req(), "map matches JVMS layout");
644
645 // We begin parsing as if we have just encountered a jump to the
646 // method entry.
647 Block* entry_block = start_block();
648 assert(entry_block->start() == (is_osr_parse() ? osr_bci() : 0), "");
649 set_map_clone(entry_map);
650 merge_common(entry_block, entry_block->next_path_num());
651
652 #ifndef PRODUCT
653 BytecodeParseHistogram *parse_histogram_obj = new (C->env()->arena()) BytecodeParseHistogram(this, C);
654 set_parse_histogram( parse_histogram_obj );
655 #endif
656
657 // Parse all the basic blocks.
658 do_all_blocks();
659
660 // Check for bailouts during conversion to graph
661 if (failing()) {
807 void Parse::build_exits() {
808 // make a clone of caller to prevent sharing of side-effects
809 _exits.set_map(_exits.clone_map());
810 _exits.clean_stack(_exits.sp());
811 _exits.sync_jvms();
812
813 RegionNode* region = new RegionNode(1);
814 record_for_igvn(region);
815 gvn().set_type_bottom(region);
816 _exits.set_control(region);
817
818 // Note: iophi and memphi are not transformed until do_exits.
819 Node* iophi = new PhiNode(region, Type::ABIO);
820 Node* memphi = new PhiNode(region, Type::MEMORY, TypePtr::BOTTOM);
821 gvn().set_type_bottom(iophi);
822 gvn().set_type_bottom(memphi);
823 _exits.set_i_o(iophi);
824 _exits.set_all_memory(memphi);
825
826 // Add a return value to the exit state. (Do not push it yet.)
827 if (tf()->range_sig()->cnt() > TypeFunc::Parms) {
828 const Type* ret_type = tf()->range_sig()->field_at(TypeFunc::Parms);
829 if (ret_type->isa_int()) {
830 BasicType ret_bt = method()->return_type()->basic_type();
831 if (ret_bt == T_BOOLEAN ||
832 ret_bt == T_CHAR ||
833 ret_bt == T_BYTE ||
834 ret_bt == T_SHORT) {
835 ret_type = TypeInt::INT;
836 }
837 }
838
839 // Don't "bind" an unloaded return klass to the ret_phi. If the klass
840 // becomes loaded during the subsequent parsing, the loaded and unloaded
841 // types will not join when we transform and push in do_exits().
842 const TypeOopPtr* ret_oop_type = ret_type->isa_oopptr();
843 if (ret_oop_type && !ret_oop_type->is_loaded()) {
844 ret_type = TypeOopPtr::BOTTOM;
845 }
846 int ret_size = type2size[ret_type->basic_type()];
847 Node* ret_phi = new PhiNode(region, ret_type);
848 gvn().set_type_bottom(ret_phi);
849 _exits.ensure_stack(ret_size);
850 assert((int)(tf()->range_sig()->cnt() - TypeFunc::Parms) == ret_size, "good tf range");
851 assert(method()->return_type()->size() == ret_size, "tf agrees w/ method");
852 _exits.set_argument(0, ret_phi); // here is where the parser finds it
853 // Note: ret_phi is not yet pushed, until do_exits.
854 }
855 }
856
857 //----------------------------build_start_state-------------------------------
858 // Construct a state which contains only the incoming arguments from an
859 // unknown caller. The method & bci will be null & InvocationEntryBci.
860 JVMState* Compile::build_start_state(StartNode* start, const TypeFunc* tf) {
861 int arg_size = tf->domain_sig()->cnt();
862 int max_size = MAX2(arg_size, (int)tf->range_cc()->cnt());
863 JVMState* jvms = new (this) JVMState(max_size - TypeFunc::Parms);
864 SafePointNode* map = new SafePointNode(max_size, jvms);
865 jvms->set_map(map);
866 record_for_igvn(map);
867 assert(arg_size == TypeFunc::Parms + (is_osr_compilation() ? 1 : method()->arg_size()), "correct arg_size");
868 Node_Notes* old_nn = default_node_notes();
869 if (old_nn != nullptr && has_method()) {
870 Node_Notes* entry_nn = old_nn->clone(this);
871 JVMState* entry_jvms = new(this) JVMState(method(), old_nn->jvms());
872 entry_jvms->set_offsets(0);
873 entry_jvms->set_bci(entry_bci());
874 entry_nn->set_jvms(entry_jvms);
875 set_default_node_notes(entry_nn);
876 }
877 PhaseGVN& gvn = *initial_gvn();
878 uint i = 0;
879 int arg_num = 0;
880 for (uint j = 0; i < (uint)arg_size; i++) {
881 const Type* t = tf->domain_sig()->field_at(i);
882 Node* parm = nullptr;
883 if (t->is_inlinetypeptr() && method()->is_scalarized_arg(arg_num)) {
884 // Inline type arguments are not passed by reference: we get an argument per
885 // field of the inline type. Build InlineTypeNodes from the inline type arguments.
886 GraphKit kit(jvms, &gvn);
887 kit.set_control(map->control());
888 Node* old_mem = map->memory();
889 // Use immutable memory for inline type loads and restore it below
890 kit.set_all_memory(C->immutable_memory());
891 parm = InlineTypeNode::make_from_multi(&kit, start, t->inline_klass(), j, /* in= */ true, /* null_free= */ !t->maybe_null());
892 map->set_control(kit.control());
893 map->set_memory(old_mem);
894 } else {
895 parm = gvn.transform(new ParmNode(start, j++));
896 }
897 map->init_req(i, parm);
898 // Record all these guys for later GVN.
899 record_for_igvn(parm);
900 if (i >= TypeFunc::Parms && t != Type::HALF) {
901 arg_num++;
902 }
903 }
904 for (; i < map->req(); i++) {
905 map->init_req(i, top());
906 }
907 assert(jvms->argoff() == TypeFunc::Parms, "parser gets arguments here");
908 set_default_node_notes(old_nn);
909 return jvms;
910 }
911
912 //-----------------------------make_node_notes---------------------------------
913 Node_Notes* Parse::make_node_notes(Node_Notes* caller_nn) {
914 if (caller_nn == nullptr) return nullptr;
915 Node_Notes* nn = caller_nn->clone(C);
916 JVMState* caller_jvms = nn->jvms();
917 JVMState* jvms = new (C) JVMState(method(), caller_jvms);
918 jvms->set_offsets(0);
919 jvms->set_bci(_entry_bci);
920 nn->set_jvms(jvms);
921 return nn;
922 }
923
924
925 //--------------------------return_values--------------------------------------
926 void Compile::return_values(JVMState* jvms) {
927 GraphKit kit(jvms);
928 Node* ret = new ReturnNode(TypeFunc::Parms,
929 kit.control(),
930 kit.i_o(),
931 kit.reset_memory(),
932 kit.frameptr(),
933 kit.returnadr());
934 // Add zero or 1 return values
935 int ret_size = tf()->range_sig()->cnt() - TypeFunc::Parms;
936 if (ret_size > 0) {
937 kit.inc_sp(-ret_size); // pop the return value(s)
938 kit.sync_jvms();
939 Node* res = kit.argument(0);
940 if (tf()->returns_inline_type_as_fields()) {
941 // Multiple return values (inline type fields): add as many edges
942 // to the Return node as returned values.
943 InlineTypeNode* vt = res->as_InlineType();
944 ret->add_req_batch(nullptr, tf()->range_cc()->cnt() - TypeFunc::Parms);
945 if (vt->is_allocated(&kit.gvn()) && !StressCallingConvention) {
946 ret->init_req(TypeFunc::Parms, vt);
947 } else {
948 // Return the tagged klass pointer to signal scalarization to the caller
949 Node* tagged_klass = vt->tagged_klass(kit.gvn());
950 // Return null if the inline type is null (IsInit field is not set)
951 Node* conv = kit.gvn().transform(new ConvI2LNode(vt->get_is_init()));
952 Node* shl = kit.gvn().transform(new LShiftLNode(conv, kit.intcon(63)));
953 Node* shr = kit.gvn().transform(new RShiftLNode(shl, kit.intcon(63)));
954 tagged_klass = kit.gvn().transform(new AndLNode(tagged_klass, shr));
955 ret->init_req(TypeFunc::Parms, tagged_klass);
956 }
957 uint idx = TypeFunc::Parms + 1;
958 vt->pass_fields(&kit, ret, idx, false, false);
959 } else {
960 ret->add_req(res);
961 // Note: The second dummy edge is not needed by a ReturnNode.
962 }
963 }
964 // bind it to root
965 root()->add_req(ret);
966 record_for_igvn(ret);
967 initial_gvn()->transform(ret);
968 }
969
970 //------------------------rethrow_exceptions-----------------------------------
971 // Bind all exception states in the list into a single RethrowNode.
972 void Compile::rethrow_exceptions(JVMState* jvms) {
973 GraphKit kit(jvms);
974 if (!kit.has_exceptions()) return; // nothing to generate
975 // Load my combined exception state into the kit, with all phis transformed:
976 SafePointNode* ex_map = kit.combine_and_pop_all_exception_states();
977 Node* ex_oop = kit.use_exception_state(ex_map);
978 RethrowNode* exit = new RethrowNode(kit.control(),
979 kit.i_o(), kit.reset_memory(),
980 kit.frameptr(), kit.returnadr(),
981 // like a return but with exception input
982 ex_oop);
1066 // to complete, we force all writes to complete.
1067 //
1068 // 2. Experimental VM option is used to force the barrier if any field
1069 // was written out in the constructor.
1070 //
1071 // 3. On processors which are not CPU_MULTI_COPY_ATOMIC (e.g. PPC64),
1072 // support_IRIW_for_not_multiple_copy_atomic_cpu selects that
1073 // MemBarVolatile is used before volatile load instead of after volatile
1074 // store, so there's no barrier after the store.
1075 // We want to guarantee the same behavior as on platforms with total store
1076 // order, although this is not required by the Java memory model.
1077 // In this case, we want to enforce visibility of volatile field
1078 // initializations which are performed in constructors.
1079 // So as with finals, we add a barrier here.
1080 //
1081 // "All bets are off" unless the first publication occurs after a
1082 // normal return from the constructor. We do not attempt to detect
1083 // such unusual early publications. But no barrier is needed on
1084 // exceptional returns, since they cannot publish normally.
1085 //
1086 if ((method()->is_object_constructor() || method()->is_class_initializer()) &&
1087 (wrote_final() || wrote_stable() ||
1088 (AlwaysSafeConstructors && wrote_fields()) ||
1089 (support_IRIW_for_not_multiple_copy_atomic_cpu && wrote_volatile()))) {
1090 Node* recorded_alloc = alloc_with_final_or_stable();
1091 _exits.insert_mem_bar(UseStoreStoreForCtor ? Op_MemBarStoreStore : Op_MemBarRelease,
1092 recorded_alloc);
1093
1094 // If Memory barrier is created for final fields write
1095 // and allocation node does not escape the initialize method,
1096 // then barrier introduced by allocation node can be removed.
1097 if (DoEscapeAnalysis && (recorded_alloc != nullptr)) {
1098 AllocateNode* alloc = AllocateNode::Ideal_allocation(recorded_alloc);
1099 alloc->compute_MemBar_redundancy(method());
1100 }
1101 if (PrintOpto && (Verbose || WizardMode)) {
1102 method()->print_name();
1103 tty->print_cr(" writes finals/@Stable and needs a memory barrier");
1104 }
1105 }
1106
1107 for (MergeMemStream mms(_exits.merged_memory()); mms.next_non_empty(); ) {
1108 // transform each slice of the original memphi:
1109 mms.set_memory(_gvn.transform(mms.memory()));
1110 }
1111 // Clean up input MergeMems created by transforming the slices
1112 _gvn.transform(_exits.merged_memory());
1113
1114 if (tf()->range_sig()->cnt() > TypeFunc::Parms) {
1115 const Type* ret_type = tf()->range_sig()->field_at(TypeFunc::Parms);
1116 Node* ret_phi = _gvn.transform( _exits.argument(0) );
1117 if (!_exits.control()->is_top() && _gvn.type(ret_phi)->empty()) {
1118 // If the type we set for the ret_phi in build_exits() is too optimistic and
1119 // the ret_phi is top now, there's an extremely small chance that it may be due to class
1120 // loading. It could also be due to an error, so mark this method as not compilable because
1121 // otherwise this could lead to an infinite compile loop.
1122 // In any case, this code path is rarely (and never in my testing) reached.
1123 C->record_method_not_compilable("Can't determine return type.");
1124 return;
1125 }
1126 if (ret_type->isa_int()) {
1127 BasicType ret_bt = method()->return_type()->basic_type();
1128 ret_phi = mask_int_value(ret_phi, ret_bt, &_gvn);
1129 }
1130 _exits.push_node(ret_type->basic_type(), ret_phi);
1131 }
1132
1133 // Note: Logic for creating and optimizing the ReturnNode is in Compile.
1134
1135 // Unlock along the exceptional paths.
1189
1190 //-----------------------------create_entry_map-------------------------------
1191 // Initialize our parser map to contain the types at method entry.
1192 // For OSR, the map contains a single RawPtr parameter.
1193 // Initial monitor locking for sync. methods is performed by do_method_entry.
1194 SafePointNode* Parse::create_entry_map() {
1195 // Check for really stupid bail-out cases.
1196 uint len = TypeFunc::Parms + method()->max_locals() + method()->max_stack();
1197 if (len >= 32760) {
1198 // Bailout expected, this is a very rare edge case.
1199 C->record_method_not_compilable("too many local variables");
1200 return nullptr;
1201 }
1202
1203 // clear current replaced nodes that are of no use from here on (map was cloned in build_exits).
1204 _caller->map()->delete_replaced_nodes();
1205
1206 // If this is an inlined method, we may have to do a receiver null check.
1207 if (_caller->has_method() && is_normal_parse() && !method()->is_static()) {
1208 GraphKit kit(_caller);
1209 Node* receiver = kit.argument(0);
1210 Node* null_free = kit.null_check_receiver_before_call(method());
1211 _caller = kit.transfer_exceptions_into_jvms();
1212 if (receiver->is_InlineType() && receiver->as_InlineType()->is_larval()) {
1213 // Replace the larval inline type receiver in the exit map as well to make sure that
1214 // we can find and update it in Parse::do_call when we are done with the initialization.
1215 _exits.map()->replace_edge(receiver, null_free);
1216 }
1217 if (kit.stopped()) {
1218 _exits.add_exception_states_from(_caller);
1219 _exits.set_jvms(_caller);
1220 return nullptr;
1221 }
1222 }
1223
1224 assert(method() != nullptr, "parser must have a method");
1225
1226 // Create an initial safepoint to hold JVM state during parsing
1227 JVMState* jvms = new (C) JVMState(method(), _caller->has_method() ? _caller : nullptr);
1228 set_map(new SafePointNode(len, jvms));
1229 jvms->set_map(map());
1230 record_for_igvn(map());
1231 assert(jvms->endoff() == len, "correct jvms sizing");
1232
1233 SafePointNode* inmap = _caller->map();
1234 assert(inmap != nullptr, "must have inmap");
1235 // In case of null check on receiver above
1236 map()->transfer_replaced_nodes_from(inmap, _new_idx);
1237
1238 uint i;
1239
1240 // Pass thru the predefined input parameters.
1241 for (i = 0; i < TypeFunc::Parms; i++) {
1242 map()->init_req(i, inmap->in(i));
1243 }
1244
1245 if (depth() == 1) {
1246 assert(map()->memory()->Opcode() == Op_Parm, "");
1247 // Insert the memory aliasing node
1248 set_all_memory(reset_memory());
1249 }
1250 assert(merged_memory(), "");
1251
1252 // Now add the locals which are initially bound to arguments:
1253 uint arg_size = tf()->domain_sig()->cnt();
1254 ensure_stack(arg_size - TypeFunc::Parms); // OSR methods have funny args
1255 for (i = TypeFunc::Parms; i < arg_size; i++) {
1256 map()->init_req(i, inmap->argument(_caller, i - TypeFunc::Parms));
1257 }
1258
1259 // Clear out the rest of the map (locals and stack)
1260 for (i = arg_size; i < len; i++) {
1261 map()->init_req(i, top());
1262 }
1263
1264 SafePointNode* entry_map = stop();
1265 return entry_map;
1266 }
1267
1268 //-----------------------------do_method_entry--------------------------------
1269 // Emit any code needed in the pseudo-block before BCI zero.
1270 // The main thing to do is lock the receiver of a synchronized method.
1271 void Parse::do_method_entry() {
1272 set_parse_bci(InvocationEntryBci); // Pseudo-BCP
1273 set_sp(0); // Java Stack Pointer
1307
1308 // If the method is synchronized, we need to construct a lock node, attach
1309 // it to the Start node, and pin it there.
1310 if (method()->is_synchronized()) {
1311 // Insert a FastLockNode right after the Start which takes as arguments
1312 // the current thread pointer, the "this" pointer & the address of the
1313 // stack slot pair used for the lock. The "this" pointer is a projection
1314 // off the start node, but the locking spot has to be constructed by
1315 // creating a ConLNode of 0, and boxing it with a BoxLockNode. The BoxLockNode
1316 // becomes the second argument to the FastLockNode call. The
1317 // FastLockNode becomes the new control parent to pin it to the start.
1318
1319 // Setup Object Pointer
1320 Node *lock_obj = nullptr;
1321 if (method()->is_static()) {
1322 ciInstance* mirror = _method->holder()->java_mirror();
1323 const TypeInstPtr *t_lock = TypeInstPtr::make(mirror);
1324 lock_obj = makecon(t_lock);
1325 } else { // Else pass the "this" pointer,
1326 lock_obj = local(0); // which is Parm0 from StartNode
1327 assert(!_gvn.type(lock_obj)->make_oopptr()->can_be_inline_type(), "can't be an inline type");
1328 }
1329 // Clear out dead values from the debug info.
1330 kill_dead_locals();
1331 // Build the FastLockNode
1332 _synch_lock = shared_lock(lock_obj);
1333 // Check for bailout in shared_lock
1334 if (failing()) { return; }
1335 }
1336
1337 // Feed profiling data for parameters to the type system so it can
1338 // propagate it as speculative types
1339 record_profiled_parameters_for_speculation();
1340 }
1341
1342 //------------------------------init_blocks------------------------------------
1343 // Initialize our parser map to contain the types/monitors at method entry.
1344 void Parse::init_blocks() {
1345 // Create the blocks.
1346 _block_count = flow()->block_count();
1347 _blocks = NEW_RESOURCE_ARRAY(Block, _block_count);
1743 //--------------------handle_missing_successor---------------------------------
1744 void Parse::handle_missing_successor(int target_bci) {
1745 #ifndef PRODUCT
1746 Block* b = block();
1747 int trap_bci = b->flow()->has_trap()? b->flow()->trap_bci(): -1;
1748 tty->print_cr("### Missing successor at bci:%d for block #%d (trap_bci:%d)", target_bci, b->rpo(), trap_bci);
1749 #endif
1750 ShouldNotReachHere();
1751 }
1752
1753 //--------------------------merge_common---------------------------------------
1754 void Parse::merge_common(Parse::Block* target, int pnum) {
1755 if (TraceOptoParse) {
1756 tty->print("Merging state at block #%d bci:%d", target->rpo(), target->start());
1757 }
1758
1759 // Zap extra stack slots to top
1760 assert(sp() == target->start_sp(), "");
1761 clean_stack(sp());
1762
1763 // Check for merge conflicts involving inline types
1764 JVMState* old_jvms = map()->jvms();
1765 int old_bci = bci();
1766 JVMState* tmp_jvms = old_jvms->clone_shallow(C);
1767 tmp_jvms->set_should_reexecute(true);
1768 tmp_jvms->bind_map(map());
1769 // Execution needs to restart a the next bytecode (entry of next
1770 // block)
1771 if (target->is_merged() ||
1772 pnum > PhiNode::Input ||
1773 target->is_handler() ||
1774 target->is_loop_head()) {
1775 set_parse_bci(target->start());
1776 for (uint j = TypeFunc::Parms; j < map()->req(); j++) {
1777 Node* n = map()->in(j); // Incoming change to target state.
1778 const Type* t = nullptr;
1779 if (tmp_jvms->is_loc(j)) {
1780 t = target->local_type_at(j - tmp_jvms->locoff());
1781 } else if (tmp_jvms->is_stk(j) && j < (uint)sp() + tmp_jvms->stkoff()) {
1782 t = target->stack_type_at(j - tmp_jvms->stkoff());
1783 }
1784 if (t != nullptr && t != Type::BOTTOM) {
1785 if (n->is_InlineType() && !t->is_inlinetypeptr()) {
1786 // Allocate inline type in src block to be able to merge it with oop in target block
1787 map()->set_req(j, n->as_InlineType()->buffer(this));
1788 } else if (!n->is_InlineType() && t->is_inlinetypeptr()) {
1789 // Scalarize null in src block to be able to merge it with inline type in target block
1790 assert(gvn().type(n)->is_zero_type(), "Should have been scalarized");
1791 map()->set_req(j, InlineTypeNode::make_null(gvn(), t->inline_klass()));
1792 }
1793 }
1794 }
1795 }
1796 old_jvms->bind_map(map());
1797 set_parse_bci(old_bci);
1798
1799 if (!target->is_merged()) { // No prior mapping at this bci
1800 if (TraceOptoParse) { tty->print(" with empty state"); }
1801
1802 // If this path is dead, do not bother capturing it as a merge.
1803 // It is "as if" we had 1 fewer predecessors from the beginning.
1804 if (stopped()) {
1805 if (TraceOptoParse) tty->print_cr(", but path is dead and doesn't count");
1806 return;
1807 }
1808
1809 // Make a region if we know there are multiple or unpredictable inputs.
1810 // (Also, if this is a plain fall-through, we might see another region,
1811 // which must not be allowed into this block's map.)
1812 if (pnum > PhiNode::Input // Known multiple inputs.
1813 || target->is_handler() // These have unpredictable inputs.
1814 || target->is_loop_head() // Known multiple inputs
1815 || control()->is_Region()) { // We must hide this guy.
1816
1817 int current_bci = bci();
1818 set_parse_bci(target->start()); // Set target bci
1833 record_for_igvn(r);
1834 // zap all inputs to null for debugging (done in Node(uint) constructor)
1835 // for (int j = 1; j < edges+1; j++) { r->init_req(j, nullptr); }
1836 r->init_req(pnum, control());
1837 set_control(r);
1838 target->copy_irreducible_status_to(r, jvms());
1839 set_parse_bci(current_bci); // Restore bci
1840 }
1841
1842 // Convert the existing Parser mapping into a mapping at this bci.
1843 store_state_to(target);
1844 assert(target->is_merged(), "do not come here twice");
1845
1846 } else { // Prior mapping at this bci
1847 if (TraceOptoParse) { tty->print(" with previous state"); }
1848 #ifdef ASSERT
1849 if (target->is_SEL_head()) {
1850 target->mark_merged_backedge(block());
1851 }
1852 #endif
1853
1854 // We must not manufacture more phis if the target is already parsed.
1855 bool nophi = target->is_parsed();
1856
1857 SafePointNode* newin = map();// Hang on to incoming mapping
1858 Block* save_block = block(); // Hang on to incoming block;
1859 load_state_from(target); // Get prior mapping
1860
1861 assert(newin->jvms()->locoff() == jvms()->locoff(), "JVMS layouts agree");
1862 assert(newin->jvms()->stkoff() == jvms()->stkoff(), "JVMS layouts agree");
1863 assert(newin->jvms()->monoff() == jvms()->monoff(), "JVMS layouts agree");
1864 assert(newin->jvms()->endoff() == jvms()->endoff(), "JVMS layouts agree");
1865
1866 // Iterate over my current mapping and the old mapping.
1867 // Where different, insert Phi functions.
1868 // Use any existing Phi functions.
1869 assert(control()->is_Region(), "must be merging to a region");
1870 RegionNode* r = control()->as_Region();
1871
1872 // Compute where to merge into
1873 // Merge incoming control path
1874 r->init_req(pnum, newin->control());
1875
1876 if (pnum == 1) { // Last merge for this Region?
1877 if (!block()->flow()->is_irreducible_loop_secondary_entry()) {
1878 Node* result = _gvn.transform(r);
1879 if (r != result && TraceOptoParse) {
1880 tty->print_cr("Block #%d replace %d with %d", block()->rpo(), r->_idx, result->_idx);
1881 }
1882 }
1883 record_for_igvn(r);
1884 }
1885
1886 // Update all the non-control inputs to map:
1887 assert(TypeFunc::Parms == newin->jvms()->locoff(), "parser map should contain only youngest jvms");
1888 bool check_elide_phi = target->is_SEL_backedge(save_block);
1889 bool last_merge = (pnum == PhiNode::Input);
1890 for (uint j = 1; j < newin->req(); j++) {
1891 Node* m = map()->in(j); // Current state of target.
1892 Node* n = newin->in(j); // Incoming change to target state.
1893 PhiNode* phi;
1894 if (m->is_Phi() && m->as_Phi()->region() == r) {
1895 phi = m->as_Phi();
1896 } else if (m->is_InlineType() && m->as_InlineType()->has_phi_inputs(r)) {
1897 phi = m->as_InlineType()->get_oop()->as_Phi();
1898 } else {
1899 phi = nullptr;
1900 }
1901 if (m != n) { // Different; must merge
1902 switch (j) {
1903 // Frame pointer and Return Address never changes
1904 case TypeFunc::FramePtr:// Drop m, use the original value
1905 case TypeFunc::ReturnAdr:
1906 break;
1907 case TypeFunc::Memory: // Merge inputs to the MergeMem node
1908 assert(phi == nullptr, "the merge contains phis, not vice versa");
1909 merge_memory_edges(n->as_MergeMem(), pnum, nophi);
1910 continue;
1911 default: // All normal stuff
1912 if (phi == nullptr) {
1913 const JVMState* jvms = map()->jvms();
1914 if (EliminateNestedLocks &&
1915 jvms->is_mon(j) && jvms->is_monitor_box(j)) {
1916 // BoxLock nodes are not commoning when EliminateNestedLocks is on.
1917 // Use old BoxLock node as merged box.
1918 assert(newin->jvms()->is_monitor_box(j), "sanity");
1919 // This assert also tests that nodes are BoxLock.
1920 assert(BoxLockNode::same_slot(n, m), "sanity");
1927 // Incremental Inlining before EA and Macro nodes elimination.
1928 //
1929 // Incremental Inlining is executed after IGVN optimizations
1930 // during which BoxLock can be marked as Coarsened.
1931 old_box->set_coarsened(); // Verifies state
1932 old_box->set_unbalanced();
1933 }
1934 C->gvn_replace_by(n, m);
1935 } else if (!check_elide_phi || !target->can_elide_SEL_phi(j)) {
1936 phi = ensure_phi(j, nophi);
1937 }
1938 }
1939 break;
1940 }
1941 }
1942 // At this point, n might be top if:
1943 // - there is no phi (because TypeFlow detected a conflict), or
1944 // - the corresponding control edges is top (a dead incoming path)
1945 // It is a bug if we create a phi which sees a garbage value on a live path.
1946
1947 // Merging two inline types?
1948 if (phi != nullptr && phi->bottom_type()->is_inlinetypeptr()) {
1949 // Reload current state because it may have been updated by ensure_phi
1950 m = map()->in(j);
1951 InlineTypeNode* vtm = m->as_InlineType(); // Current inline type
1952 InlineTypeNode* vtn = n->as_InlineType(); // Incoming inline type
1953 assert(vtm->get_oop() == phi, "Inline type should have Phi input");
1954 if (TraceOptoParse) {
1955 #ifdef ASSERT
1956 tty->print_cr("\nMerging inline types");
1957 tty->print_cr("Current:");
1958 vtm->dump(2);
1959 tty->print_cr("Incoming:");
1960 vtn->dump(2);
1961 tty->cr();
1962 #endif
1963 }
1964 // Do the merge
1965 vtm->merge_with(&_gvn, vtn, pnum, last_merge);
1966 if (last_merge) {
1967 map()->set_req(j, _gvn.transform(vtm));
1968 record_for_igvn(vtm);
1969 }
1970 } else if (phi != nullptr) {
1971 assert(n != top() || r->in(pnum) == top(), "live value must not be garbage");
1972 assert(phi->region() == r, "");
1973 phi->set_req(pnum, n); // Then add 'n' to the merge
1974 if (last_merge) {
1975 // Last merge for this Phi.
1976 // So far, Phis have had a reasonable type from ciTypeFlow.
1977 // Now _gvn will join that with the meet of current inputs.
1978 // BOTTOM is never permissible here, 'cause pessimistically
1979 // Phis of pointers cannot lose the basic pointer type.
1980 debug_only(const Type* bt1 = phi->bottom_type());
1981 assert(bt1 != Type::BOTTOM, "should not be building conflict phis");
1982 map()->set_req(j, _gvn.transform(phi));
1983 debug_only(const Type* bt2 = phi->bottom_type());
1984 assert(bt2->higher_equal_speculative(bt1), "must be consistent with type-flow");
1985 record_for_igvn(phi);
1986 }
1987 }
1988 } // End of for all values to be merged
1989
1990 if (last_merge && !r->in(0)) { // The occasional useless Region
1991 assert(control() == r, "");
1992 set_control(r->nonnull_req());
1993 }
1994
1995 map()->merge_replaced_nodes_with(newin);
1996
1997 // newin has been subsumed into the lazy merge, and is now dead.
1998 set_block(save_block);
1999
2000 stop(); // done with this guy, for now
2001 }
2002
2003 if (TraceOptoParse) {
2004 tty->print_cr(" on path %d", pnum);
2005 }
2006
2007 // Done with this parser state.
2008 assert(stopped(), "");
2009 }
2010
2122
2123 // Add new path to the region.
2124 uint pnum = r->req();
2125 r->add_req(nullptr);
2126
2127 for (uint i = 1; i < map->req(); i++) {
2128 Node* n = map->in(i);
2129 if (i == TypeFunc::Memory) {
2130 // Ensure a phi on all currently known memories.
2131 for (MergeMemStream mms(n->as_MergeMem()); mms.next_non_empty(); ) {
2132 Node* phi = mms.memory();
2133 if (phi->is_Phi() && phi->as_Phi()->region() == r) {
2134 assert(phi->req() == pnum, "must be same size as region");
2135 phi->add_req(nullptr);
2136 }
2137 }
2138 } else {
2139 if (n->is_Phi() && n->as_Phi()->region() == r) {
2140 assert(n->req() == pnum, "must be same size as region");
2141 n->add_req(nullptr);
2142 } else if (n->is_InlineType() && n->as_InlineType()->has_phi_inputs(r)) {
2143 n->as_InlineType()->add_new_path(r);
2144 }
2145 }
2146 }
2147
2148 return pnum;
2149 }
2150
2151 //------------------------------ensure_phi-------------------------------------
2152 // Turn the idx'th entry of the current map into a Phi
2153 PhiNode *Parse::ensure_phi(int idx, bool nocreate) {
2154 SafePointNode* map = this->map();
2155 Node* region = map->control();
2156 assert(region->is_Region(), "");
2157
2158 Node* o = map->in(idx);
2159 assert(o != nullptr, "");
2160
2161 if (o == top()) return nullptr; // TOP always merges into TOP
2162
2163 if (o->is_Phi() && o->as_Phi()->region() == region) {
2164 return o->as_Phi();
2165 }
2166 InlineTypeNode* vt = o->isa_InlineType();
2167 if (vt != nullptr && vt->has_phi_inputs(region)) {
2168 return vt->get_oop()->as_Phi();
2169 }
2170
2171 // Now use a Phi here for merging
2172 assert(!nocreate, "Cannot build a phi for a block already parsed.");
2173 const JVMState* jvms = map->jvms();
2174 const Type* t = nullptr;
2175 if (jvms->is_loc(idx)) {
2176 t = block()->local_type_at(idx - jvms->locoff());
2177 } else if (jvms->is_stk(idx)) {
2178 t = block()->stack_type_at(idx - jvms->stkoff());
2179 } else if (jvms->is_mon(idx)) {
2180 assert(!jvms->is_monitor_box(idx), "no phis for boxes");
2181 t = TypeInstPtr::BOTTOM; // this is sufficient for a lock object
2182 } else if ((uint)idx < TypeFunc::Parms) {
2183 t = o->bottom_type(); // Type::RETURN_ADDRESS or such-like.
2184 } else {
2185 assert(false, "no type information for this phi");
2186 }
2187
2188 // If the type falls to bottom, then this must be a local that
2189 // is already dead or is mixing ints and oops or some such.
2190 // Forcing it to top makes it go dead.
2191 if (t == Type::BOTTOM) {
2192 map->set_req(idx, top());
2193 return nullptr;
2194 }
2195
2196 // Do not create phis for top either.
2197 // A top on a non-null control flow must be an unused even after the.phi.
2198 if (t == Type::TOP || t == Type::HALF) {
2199 map->set_req(idx, top());
2200 return nullptr;
2201 }
2202
2203 if (vt != nullptr && t->is_inlinetypeptr()) {
2204 // Inline types are merged by merging their field values.
2205 // Create a cloned InlineTypeNode with phi inputs that
2206 // represents the merged inline type and update the map.
2207 vt = vt->clone_with_phis(&_gvn, region);
2208 map->set_req(idx, vt);
2209 return vt->get_oop()->as_Phi();
2210 } else {
2211 PhiNode* phi = PhiNode::make(region, o, t);
2212 gvn().set_type(phi, t);
2213 if (C->do_escape_analysis()) record_for_igvn(phi);
2214 map->set_req(idx, phi);
2215 return phi;
2216 }
2217 }
2218
2219 //--------------------------ensure_memory_phi----------------------------------
2220 // Turn the idx'th slice of the current memory into a Phi
2221 PhiNode *Parse::ensure_memory_phi(int idx, bool nocreate) {
2222 MergeMemNode* mem = merged_memory();
2223 Node* region = control();
2224 assert(region->is_Region(), "");
2225
2226 Node *o = (idx == Compile::AliasIdxBot)? mem->base_memory(): mem->memory_at(idx);
2227 assert(o != nullptr && o != top(), "");
2228
2229 PhiNode* phi;
2230 if (o->is_Phi() && o->as_Phi()->region() == region) {
2231 phi = o->as_Phi();
2232 if (phi == mem->base_memory() && idx >= Compile::AliasIdxRaw) {
2233 // clone the shared base memory phi to make a new memory split
2234 assert(!nocreate, "Cannot build a phi for a block already parsed.");
2235 const Type* t = phi->bottom_type();
2236 const TypePtr* adr_type = C->get_adr_type(idx);
2326 // Add check to deoptimize once holder klass is fully initialized.
2327 void Parse::clinit_deopt() {
2328 assert(C->has_method(), "only for normal compilations");
2329 assert(depth() == 1, "only for main compiled method");
2330 assert(is_normal_parse(), "no barrier needed on osr entry");
2331 assert(!method()->holder()->is_not_initialized(), "initialization should have been started");
2332
2333 set_parse_bci(0);
2334
2335 Node* holder = makecon(TypeKlassPtr::make(method()->holder(), Type::trust_interfaces));
2336 guard_klass_being_initialized(holder);
2337 }
2338
2339 //------------------------------return_current---------------------------------
2340 // Append current _map to _exit_return
2341 void Parse::return_current(Node* value) {
2342 if (method()->intrinsic_id() == vmIntrinsics::_Object_init) {
2343 call_register_finalizer();
2344 }
2345
2346 // frame pointer is always same, already captured
2347 if (value != nullptr) {
2348 Node* phi = _exits.argument(0);
2349 const Type* return_type = phi->bottom_type();
2350 const TypeInstPtr* tr = return_type->isa_instptr();
2351 assert(!value->is_InlineType() || !value->as_InlineType()->is_larval(), "returning a larval");
2352 if ((tf()->returns_inline_type_as_fields() || (_caller->has_method() && !Compile::current()->inlining_incrementally())) &&
2353 return_type->is_inlinetypeptr()) {
2354 // Inline type is returned as fields, make sure it is scalarized
2355 if (!value->is_InlineType()) {
2356 value = InlineTypeNode::make_from_oop(this, value, return_type->inline_klass());
2357 }
2358 if (!_caller->has_method() || Compile::current()->inlining_incrementally()) {
2359 // Returning from root or an incrementally inlined method. Make sure all non-flat
2360 // fields are buffered and re-execute if allocation triggers deoptimization.
2361 PreserveReexecuteState preexecs(this);
2362 assert(tf()->returns_inline_type_as_fields(), "must be returned as fields");
2363 jvms()->set_should_reexecute(true);
2364 inc_sp(1);
2365 value = value->as_InlineType()->allocate_fields(this);
2366 }
2367 } else if (value->is_InlineType()) {
2368 // Inline type is returned as oop, make sure it is buffered and re-execute
2369 // if allocation triggers deoptimization.
2370 PreserveReexecuteState preexecs(this);
2371 jvms()->set_should_reexecute(true);
2372 inc_sp(1);
2373 value = value->as_InlineType()->buffer(this);
2374 }
2375 // ...else
2376 // If returning oops to an interface-return, there is a silent free
2377 // cast from oop to interface allowed by the Verifier. Make it explicit here.
2378 phi->add_req(value);
2379 }
2380
2381 // Do not set_parse_bci, so that return goo is credited to the return insn.
2382 set_bci(InvocationEntryBci);
2383 if (method()->is_synchronized() && GenerateSynchronizationCode) {
2384 shared_unlock(_synch_lock->box_node(), _synch_lock->obj_node());
2385 }
2386 if (C->env()->dtrace_method_probes()) {
2387 make_dtrace_method_exit(method());
2388 }
2389
2390 SafePointNode* exit_return = _exits.map();
2391 exit_return->in( TypeFunc::Control )->add_req( control() );
2392 exit_return->in( TypeFunc::I_O )->add_req( i_o () );
2393 Node *mem = exit_return->in( TypeFunc::Memory );
2394 for (MergeMemStream mms(mem->as_MergeMem(), merged_memory()); mms.next_non_empty2(); ) {
2395 if (mms.is_empty()) {
2396 // get a copy of the base memory, and patch just this one input
2397 const TypePtr* adr_type = mms.adr_type(C);
2398 Node* phi = mms.force_memory()->as_Phi()->slice_memory(adr_type);
2399 assert(phi->as_Phi()->region() == mms.base_memory()->in(0), "");
2400 gvn().set_type_bottom(phi);
2401 phi->del_req(phi->req()-1); // prepare to re-patch
2402 mms.set_memory(phi);
2403 }
2404 mms.memory()->add_req(mms.memory2());
2405 }
2406
2407 if (_first_return) {
2408 _exits.map()->transfer_replaced_nodes_from(map(), _new_idx);
2409 _first_return = false;
2410 } else {
2411 _exits.map()->merge_replaced_nodes_with(map());
2412 }
2413
2414 stop_and_kill_map(); // This CFG path dies here
2415 }
2416
2417
2418 //------------------------------add_safepoint----------------------------------
2419 void Parse::add_safepoint() {
2420 uint parms = TypeFunc::Parms+1;
2421
2422 // Clear out dead values from the debug info.
2423 kill_dead_locals();
2424
2425 // Clone the JVM State
2426 SafePointNode *sfpnt = new SafePointNode(parms, nullptr);
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