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 "asm/assembler.inline.hpp"
26 #include "code/aotCodeCache.hpp"
27 #include "code/compiledIC.hpp"
28 #include "code/debugInfo.hpp"
29 #include "code/debugInfoRec.hpp"
30 #include "compiler/compileBroker.hpp"
31 #include "compiler/compilerDirectives.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "compiler/oopMap.hpp"
34 #include "gc/shared/barrierSet.hpp"
35 #include "gc/shared/c2/barrierSetC2.hpp"
36 #include "memory/allocation.hpp"
37 #include "opto/ad.hpp"
38 #include "opto/block.hpp"
39 #include "opto/c2_MacroAssembler.hpp"
40 #include "opto/c2compiler.hpp"
41 #include "opto/callnode.hpp"
42 #include "opto/cfgnode.hpp"
43 #include "opto/locknode.hpp"
44 #include "opto/machnode.hpp"
45 #include "opto/node.hpp"
46 #include "opto/optoreg.hpp"
47 #include "opto/output.hpp"
48 #include "opto/regalloc.hpp"
49 #include "opto/type.hpp"
50 #include "runtime/sharedRuntime.hpp"
51 #include "utilities/macros.hpp"
52 #include "utilities/powerOfTwo.hpp"
53 #include "utilities/xmlstream.hpp"
54
55 #ifndef PRODUCT
212 _first_block_size(0),
213 _handler_table(),
214 _inc_table(),
215 _stub_list(),
216 _oop_map_set(nullptr),
217 _scratch_buffer_blob(nullptr),
218 _scratch_locs_memory(nullptr),
219 _scratch_const_size(-1),
220 _in_scratch_emit_size(false),
221 _frame_slots(0),
222 _code_offsets(),
223 _node_bundling_limit(0),
224 _node_bundling_base(nullptr),
225 _orig_pc_slot(0),
226 _orig_pc_slot_offset_in_bytes(0),
227 _buf_sizes(),
228 _block(nullptr),
229 _index(0) {
230 C->set_output(this);
231 if (C->stub_name() == nullptr) {
232 _orig_pc_slot = C->fixed_slots() - (sizeof(address) / VMRegImpl::stack_slot_size);
233 }
234 }
235
236 PhaseOutput::~PhaseOutput() {
237 C->set_output(nullptr);
238 if (_scratch_buffer_blob != nullptr) {
239 BufferBlob::free(_scratch_buffer_blob);
240 }
241 }
242
243 void PhaseOutput::perform_mach_node_analysis() {
244 // Late barrier analysis must be done after schedule and bundle
245 // Otherwise liveness based spilling will fail
246 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
247 bs->late_barrier_analysis();
248
249 pd_perform_mach_node_analysis();
250
251 C->print_method(CompilerPhaseType::PHASE_MACH_ANALYSIS, 3);
252 }
253
254 // Convert Nodes to instruction bits and pass off to the VM
255 void PhaseOutput::Output() {
256 // RootNode goes
257 assert( C->cfg()->get_root_block()->number_of_nodes() == 0, "" );
258
259 // The number of new nodes (mostly MachNop) is proportional to
260 // the number of java calls and inner loops which are aligned.
261 if ( C->check_node_count((NodeLimitFudgeFactor + C->java_calls()*3 +
262 C->inner_loops()*(OptoLoopAlignment-1)),
263 "out of nodes before code generation" ) ) {
264 return;
265 }
266 // Make sure I can find the Start Node
267 Block *entry = C->cfg()->get_block(1);
268 Block *broot = C->cfg()->get_root_block();
269
270 const StartNode *start = entry->head()->as_Start();
271
272 // Replace StartNode with prolog
273 MachPrologNode *prolog = new MachPrologNode();
274 entry->map_node(prolog, 0);
275 C->cfg()->map_node_to_block(prolog, entry);
276 C->cfg()->unmap_node_from_block(start); // start is no longer in any block
277
278 // Virtual methods need an unverified entry point
279
280 if( C->is_osr_compilation() ) {
281 if( PoisonOSREntry ) {
282 // TODO: Should use a ShouldNotReachHereNode...
283 C->cfg()->insert( broot, 0, new MachBreakpointNode() );
284 }
285 } else {
286 if( C->method() && !C->method()->flags().is_static() ) {
287 // Insert unvalidated entry point
288 C->cfg()->insert( broot, 0, new MachUEPNode() );
289 }
290
291 }
292
293 // Break before main entry point
294 if ((C->method() && C->directive()->BreakAtExecuteOption) ||
295 (OptoBreakpoint && C->is_method_compilation()) ||
296 (OptoBreakpointOSR && C->is_osr_compilation()) ||
297 (OptoBreakpointC2R && !C->method()) ) {
298 // checking for C->method() means that OptoBreakpoint does not apply to
299 // runtime stubs or frame converters
300 C->cfg()->insert( entry, 1, new MachBreakpointNode() );
301 }
302
303 // Insert epilogs before every return
304 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
305 Block* block = C->cfg()->get_block(i);
306 if (!block->is_connector() && block->non_connector_successor(0) == C->cfg()->get_root_block()) { // Found a program exit point?
307 Node* m = block->end();
308 if (m->is_Mach() && m->as_Mach()->ideal_Opcode() != Op_Halt) {
309 MachEpilogNode* epilog = new MachEpilogNode(m->as_Mach()->ideal_Opcode() == Op_Return);
310 block->add_inst(epilog);
311 C->cfg()->map_node_to_block(epilog, block);
312 }
313 }
314 }
315
316 // Keeper of sizing aspects
317 _buf_sizes = BufferSizingData();
318
319 // Initialize code buffer
320 estimate_buffer_size(_buf_sizes._const);
321 if (C->failing()) return;
322
323 // Pre-compute the length of blocks and replace
324 // long branches with short if machine supports it.
325 // Must be done before ScheduleAndBundle due to SPARC delay slots
326 uint* blk_starts = NEW_RESOURCE_ARRAY(uint, C->cfg()->number_of_blocks() + 1);
327 blk_starts[0] = 0;
328 shorten_branches(blk_starts);
329
330 ScheduleAndBundle();
331 if (C->failing()) {
332 return;
333 }
334
335 perform_mach_node_analysis();
336
337 // Complete sizing of codebuffer
338 CodeBuffer* cb = init_buffer();
339 if (cb == nullptr || C->failing()) {
340 return;
341 }
342
343 BuildOopMaps();
344
345 if (C->failing()) {
346 return;
347 }
348
349 C2_MacroAssembler masm(cb);
471 // Sum all instruction sizes to compute block size
472 uint last_inst = block->number_of_nodes();
473 uint blk_size = 0;
474 for (uint j = 0; j < last_inst; j++) {
475 _index = j;
476 Node* nj = block->get_node(_index);
477 // Handle machine instruction nodes
478 if (nj->is_Mach()) {
479 MachNode* mach = nj->as_Mach();
480 blk_size += (mach->alignment_required() - 1) * relocInfo::addr_unit(); // assume worst case padding
481 reloc_size += mach->reloc();
482 if (mach->is_MachCall()) {
483 // add size information for trampoline stub
484 // class CallStubImpl is platform-specific and defined in the *.ad files.
485 stub_size += CallStubImpl::size_call_trampoline();
486 reloc_size += CallStubImpl::reloc_call_trampoline();
487
488 MachCallNode *mcall = mach->as_MachCall();
489 // This destination address is NOT PC-relative
490
491 mcall->method_set((intptr_t)mcall->entry_point());
492
493 if (mcall->is_MachCallJava() && mcall->as_MachCallJava()->_method) {
494 stub_size += CompiledDirectCall::to_interp_stub_size();
495 reloc_size += CompiledDirectCall::reloc_to_interp_stub();
496 }
497 } else if (mach->is_MachSafePoint()) {
498 // If call/safepoint are adjacent, account for possible
499 // nop to disambiguate the two safepoints.
500 // ScheduleAndBundle() can rearrange nodes in a block,
501 // check for all offsets inside this block.
502 if (last_call_adr >= blk_starts[i]) {
503 blk_size += nop_size;
504 }
505 }
506 if (mach->avoid_back_to_back(MachNode::AVOID_BEFORE)) {
507 // Nop is inserted between "avoid back to back" instructions.
508 // ScheduleAndBundle() can rearrange nodes in a block,
509 // check for all offsets inside this block.
510 if (last_avoid_back_to_back_adr >= blk_starts[i]) {
511 blk_size += nop_size;
726 // New functionality:
727 // Assert if the local is not top. In product mode let the new node
728 // override the old entry.
729 assert(local == C->top(), "LocArray collision");
730 if (local == C->top()) {
731 return;
732 }
733 array->pop();
734 }
735 const Type *t = local->bottom_type();
736
737 // Is it a safepoint scalar object node?
738 if (local->is_SafePointScalarObject()) {
739 SafePointScalarObjectNode* spobj = local->as_SafePointScalarObject();
740
741 ObjectValue* sv = sv_for_node_id(objs, spobj->_idx);
742 if (sv == nullptr) {
743 ciKlass* cik = t->is_oopptr()->exact_klass();
744 assert(cik->is_instance_klass() ||
745 cik->is_array_klass(), "Not supported allocation.");
746 sv = new ObjectValue(spobj->_idx,
747 new ConstantOopWriteValue(cik->java_mirror()->constant_encoding()));
748 set_sv_for_object_node(objs, sv);
749
750 uint first_ind = spobj->first_index(sfpt->jvms());
751 for (uint i = 0; i < spobj->n_fields(); i++) {
752 Node* fld_node = sfpt->in(first_ind+i);
753 (void)FillLocArray(sv->field_values()->length(), sfpt, fld_node, sv->field_values(), objs);
754 }
755 }
756 array->append(sv);
757 return;
758 } else if (local->is_SafePointScalarMerge()) {
759 SafePointScalarMergeNode* smerge = local->as_SafePointScalarMerge();
760 ObjectMergeValue* mv = (ObjectMergeValue*) sv_for_node_id(objs, smerge->_idx);
761
762 if (mv == nullptr) {
763 GrowableArray<ScopeValue*> deps;
764
765 int merge_pointer_idx = smerge->merge_pointer_idx(sfpt->jvms());
766 (void)FillLocArray(0, sfpt, sfpt->in(merge_pointer_idx), &deps, objs);
767 assert(deps.length() == 1, "missing value");
768
769 int selector_idx = smerge->selector_idx(sfpt->jvms());
770 (void)FillLocArray(1, nullptr, sfpt->in(selector_idx), &deps, nullptr);
976 if (!n->is_SafePointScalarObject()) {
977 continue;
978 }
979
980 ObjectValue* other = sv_for_node_id(objs, n->_idx);
981 if (ov == other) {
982 return true;
983 }
984 }
985 return false;
986 }
987
988 //--------------------------Process_OopMap_Node--------------------------------
989 void PhaseOutput::Process_OopMap_Node(MachNode *mach, int current_offset) {
990 // Handle special safepoint nodes for synchronization
991 MachSafePointNode *sfn = mach->as_MachSafePoint();
992 MachCallNode *mcall;
993
994 int safepoint_pc_offset = current_offset;
995 bool return_oop = false;
996 bool has_ea_local_in_scope = sfn->_has_ea_local_in_scope;
997 bool arg_escape = false;
998
999 // Add the safepoint in the DebugInfoRecorder
1000 if( !mach->is_MachCall() ) {
1001 mcall = nullptr;
1002 C->debug_info()->add_safepoint(safepoint_pc_offset, sfn->_oop_map);
1003 } else {
1004 mcall = mach->as_MachCall();
1005
1006 if (mcall->is_MachCallJava()) {
1007 arg_escape = mcall->as_MachCallJava()->_arg_escape;
1008 }
1009
1010 // Check if a call returns an object.
1011 if (mcall->returns_pointer()) {
1012 return_oop = true;
1013 }
1014 safepoint_pc_offset += mcall->ret_addr_offset();
1015 C->debug_info()->add_safepoint(safepoint_pc_offset, mcall->_oop_map);
1016 }
1017
1018 // Loop over the JVMState list to add scope information
1019 // Do not skip safepoints with a null method, they need monitor info
1020 JVMState* youngest_jvms = sfn->jvms();
1021 int max_depth = youngest_jvms->depth();
1022
1023 // Allocate the object pool for scalar-replaced objects -- the map from
1024 // small-integer keys (which can be recorded in the local and ostack
1025 // arrays) to descriptions of the object state.
1026 GrowableArray<ScopeValue*> *objs = new GrowableArray<ScopeValue*>();
1027
1028 // Visit scopes from oldest to youngest.
1029 for (int depth = 1; depth <= max_depth; depth++) {
1030 JVMState* jvms = youngest_jvms->of_depth(depth);
1031 int idx;
1032 ciMethod* method = jvms->has_method() ? jvms->method() : nullptr;
1033 // Safepoints that do not have method() set only provide oop-map and monitor info
1062 // Build the growable array of ScopeValues for exp stack
1063 GrowableArray<MonitorValue*> *monarray = new GrowableArray<MonitorValue*>(num_mon);
1064
1065 // Loop over monitors and insert into array
1066 for (idx = 0; idx < num_mon; idx++) {
1067 // Grab the node that defines this monitor
1068 Node* box_node = sfn->monitor_box(jvms, idx);
1069 Node* obj_node = sfn->monitor_obj(jvms, idx);
1070
1071 // Create ScopeValue for object
1072 ScopeValue *scval = nullptr;
1073
1074 if (obj_node->is_SafePointScalarObject()) {
1075 SafePointScalarObjectNode* spobj = obj_node->as_SafePointScalarObject();
1076 scval = PhaseOutput::sv_for_node_id(objs, spobj->_idx);
1077 if (scval == nullptr) {
1078 const Type *t = spobj->bottom_type();
1079 ciKlass* cik = t->is_oopptr()->exact_klass();
1080 assert(cik->is_instance_klass() ||
1081 cik->is_array_klass(), "Not supported allocation.");
1082 ObjectValue* sv = new ObjectValue(spobj->_idx,
1083 new ConstantOopWriteValue(cik->java_mirror()->constant_encoding()));
1084 PhaseOutput::set_sv_for_object_node(objs, sv);
1085
1086 uint first_ind = spobj->first_index(youngest_jvms);
1087 for (uint i = 0; i < spobj->n_fields(); i++) {
1088 Node* fld_node = sfn->in(first_ind+i);
1089 (void)FillLocArray(sv->field_values()->length(), sfn, fld_node, sv->field_values(), objs);
1090 }
1091 scval = sv;
1092 }
1093 } else if (obj_node->is_SafePointScalarMerge()) {
1094 SafePointScalarMergeNode* smerge = obj_node->as_SafePointScalarMerge();
1095 ObjectMergeValue* mv = (ObjectMergeValue*) sv_for_node_id(objs, smerge->_idx);
1096
1097 if (mv == nullptr) {
1098 GrowableArray<ScopeValue*> deps;
1099
1100 int merge_pointer_idx = smerge->merge_pointer_idx(youngest_jvms);
1101 FillLocArray(0, sfn, sfn->in(merge_pointer_idx), &deps, objs);
1102 assert(deps.length() == 1, "missing value");
1103
1170 DebugToken *locvals = C->debug_info()->create_scope_values(locarray);
1171 DebugToken *expvals = C->debug_info()->create_scope_values(exparray);
1172 DebugToken *monvals = C->debug_info()->create_monitor_values(monarray);
1173
1174 // Make method available for all Safepoints
1175 ciMethod* scope_method = method ? method : C->method();
1176 // Describe the scope here
1177 assert(jvms->bci() >= InvocationEntryBci && jvms->bci() <= 0x10000, "must be a valid or entry BCI");
1178 assert(!jvms->should_reexecute() || depth == max_depth, "reexecute allowed only for the youngest");
1179 // Now we can describe the scope.
1180 methodHandle null_mh;
1181 bool rethrow_exception = false;
1182 C->debug_info()->describe_scope(
1183 safepoint_pc_offset,
1184 null_mh,
1185 scope_method,
1186 jvms->bci(),
1187 jvms->should_reexecute(),
1188 rethrow_exception,
1189 return_oop,
1190 has_ea_local_in_scope,
1191 arg_escape,
1192 locvals,
1193 expvals,
1194 monvals
1195 );
1196 } // End jvms loop
1197
1198 // Mark the end of the scope set.
1199 C->debug_info()->end_safepoint(safepoint_pc_offset);
1200 }
1201
1202
1203
1204 // A simplified version of Process_OopMap_Node, to handle non-safepoints.
1205 class NonSafepointEmitter {
1206 Compile* C;
1207 JVMState* _pending_jvms;
1208 int _pending_offset;
1209
1525 MachNode *nop = new MachNopNode(nops_cnt);
1526 block->insert_node(nop, j++);
1527 last_inst++;
1528 C->cfg()->map_node_to_block(nop, block);
1529 // Ensure enough space.
1530 masm->code()->insts()->maybe_expand_to_ensure_remaining(MAX_inst_size);
1531 if ((masm->code()->blob() == nullptr) || (!CompileBroker::should_compile_new_jobs())) {
1532 C->record_failure("CodeCache is full");
1533 return;
1534 }
1535 nop->emit(masm, C->regalloc());
1536 masm->code()->flush_bundle(true);
1537 current_offset = masm->offset();
1538 }
1539
1540 bool observe_safepoint = is_sfn;
1541 // Remember the start of the last call in a basic block
1542 if (is_mcall) {
1543 MachCallNode *mcall = mach->as_MachCall();
1544
1545 // This destination address is NOT PC-relative
1546 mcall->method_set((intptr_t)mcall->entry_point());
1547
1548 // Save the return address
1549 call_returns[block->_pre_order] = current_offset + mcall->ret_addr_offset();
1550
1551 observe_safepoint = mcall->guaranteed_safepoint();
1552 }
1553
1554 // sfn will be valid whenever mcall is valid now because of inheritance
1555 if (observe_safepoint) {
1556 // Handle special safepoint nodes for synchronization
1557 if (!is_mcall) {
1558 MachSafePointNode *sfn = mach->as_MachSafePoint();
1559 // !!!!! Stubs only need an oopmap right now, so bail out
1560 if (sfn->jvms()->method() == nullptr) {
1561 // Write the oopmap directly to the code blob??!!
1562 continue;
1563 }
1564 } // End synchronization
1565
1566 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(),
1664 if ((node_offsets != nullptr) && (n->_idx < node_offset_limit)) {
1665 node_offsets[n->_idx] = masm->offset();
1666 }
1667 #endif
1668 assert(!C->failing_internal() || C->failure_is_artificial(), "Should not reach here if failing.");
1669
1670 // "Normal" instruction case
1671 DEBUG_ONLY(uint instr_offset = masm->offset());
1672 n->emit(masm, C->regalloc());
1673 current_offset = masm->offset();
1674
1675 // Above we only verified that there is enough space in the instruction section.
1676 // However, the instruction may emit stubs that cause code buffer expansion.
1677 // Bail out here if expansion failed due to a lack of code cache space.
1678 if (C->failing()) {
1679 return;
1680 }
1681
1682 assert(!is_mcall || (call_returns[block->_pre_order] <= (uint)current_offset),
1683 "ret_addr_offset() not within emitted code");
1684
1685 #ifdef ASSERT
1686 uint n_size = n->size(C->regalloc());
1687 if (n_size < (current_offset-instr_offset)) {
1688 MachNode* mach = n->as_Mach();
1689 n->dump();
1690 mach->dump_format(C->regalloc(), tty);
1691 tty->print_cr(" n_size (%d), current_offset (%d), instr_offset (%d)", n_size, current_offset, instr_offset);
1692 Disassembler::decode(masm->code()->insts_begin() + instr_offset, masm->code()->insts_begin() + current_offset + 1, tty);
1693 tty->print_cr(" ------------------- ");
1694 BufferBlob* blob = this->scratch_buffer_blob();
1695 address blob_begin = blob->content_begin();
1696 Disassembler::decode(blob_begin, blob_begin + n_size + 1, tty);
1697 assert(false, "wrong size of mach node");
1698 }
1699 #endif
1700 non_safepoints.observe_instruction(n, current_offset);
1701
1702 // mcall is last "call" that can be a safepoint
1703 // record it so we can see if a poll will directly follow it
1704 // in which case we'll need a pad to make the PcDesc sites unique
2921 anti_do_use( b, n, _regalloc->get_reg_first(def) );
2922 anti_do_use( b, n, _regalloc->get_reg_second(def) );
2923 }
2924 }
2925 // Do not allow defs of new derived values to float above GC
2926 // points unless the base is definitely available at the GC point.
2927
2928 Node *m = b->get_node(i);
2929
2930 // Add precedence edge from following safepoint to use of derived pointer
2931 if( last_safept_node != end_node &&
2932 m != last_safept_node) {
2933 for (uint k = 1; k < m->req(); k++) {
2934 const Type *t = m->in(k)->bottom_type();
2935 if( t->isa_oop_ptr() &&
2936 t->is_ptr()->offset() != 0 ) {
2937 last_safept_node->add_prec( m );
2938 break;
2939 }
2940 }
2941 }
2942
2943 if( n->jvms() ) { // Precedence edge from derived to safept
2944 // Check if last_safept_node was moved by pinch-point insertion in anti_do_use()
2945 if( b->get_node(last_safept) != last_safept_node ) {
2946 last_safept = b->find_node(last_safept_node);
2947 }
2948 for( uint j=last_safept; j > i; j-- ) {
2949 Node *mach = b->get_node(j);
2950 if( mach->is_Mach() && mach->as_Mach()->ideal_Opcode() == Op_AddP )
2951 mach->add_prec( n );
2952 }
2953 last_safept = i;
2954 last_safept_node = m;
2955 }
2956 }
2957
2958 if (fat_proj_seen) {
2959 // Garbage collect pinch nodes that were not consumed.
2960 // They are usually created by a fat kill MachProj for a call.
3069 }
3070 #endif
3071
3072 //-----------------------init_scratch_buffer_blob------------------------------
3073 // Construct a temporary BufferBlob and cache it for this compile.
3074 void PhaseOutput::init_scratch_buffer_blob(int const_size) {
3075 // If there is already a scratch buffer blob allocated and the
3076 // constant section is big enough, use it. Otherwise free the
3077 // current and allocate a new one.
3078 BufferBlob* blob = scratch_buffer_blob();
3079 if ((blob != nullptr) && (const_size <= _scratch_const_size)) {
3080 // Use the current blob.
3081 } else {
3082 if (blob != nullptr) {
3083 BufferBlob::free(blob);
3084 }
3085
3086 ResourceMark rm;
3087 _scratch_const_size = const_size;
3088 int size = C2Compiler::initial_code_buffer_size(const_size);
3089 blob = BufferBlob::create("Compile::scratch_buffer", size);
3090 // Record the buffer blob for next time.
3091 set_scratch_buffer_blob(blob);
3092 // Have we run out of code space?
3093 if (scratch_buffer_blob() == nullptr) {
3094 // Let CompilerBroker disable further compilations.
3095 C->record_failure("Not enough space for scratch buffer in CodeCache");
3096 return;
3097 }
3098 }
3099
3100 // Initialize the relocation buffers
3101 relocInfo* locs_buf = (relocInfo*) blob->content_end() - MAX_locs_size;
3102 set_scratch_locs_memory(locs_buf);
3103 }
3104
3105
3106 //-----------------------scratch_emit_size-------------------------------------
3107 // Helper function that computes size by emitting code
3108 uint PhaseOutput::scratch_emit_size(const Node* n) {
3139 buf.insts()->set_scratch_emit();
3140 buf.stubs()->set_scratch_emit();
3141
3142 // Do the emission.
3143
3144 Label fakeL; // Fake label for branch instructions.
3145 Label* saveL = nullptr;
3146 uint save_bnum = 0;
3147 bool is_branch = n->is_MachBranch();
3148 C2_MacroAssembler masm(&buf);
3149 masm.bind(fakeL);
3150 if (is_branch) {
3151 n->as_MachBranch()->save_label(&saveL, &save_bnum);
3152 n->as_MachBranch()->label_set(&fakeL, 0);
3153 }
3154 n->emit(&masm, C->regalloc());
3155
3156 // Emitting into the scratch buffer should not fail
3157 assert(!C->failing_internal() || C->failure_is_artificial(), "Must not have pending failure. Reason is: %s", C->failure_reason());
3158
3159 if (is_branch) // Restore label.
3160 n->as_MachBranch()->label_set(saveL, save_bnum);
3161
3162 // End scratch_emit_size section.
3163 set_in_scratch_emit_size(false);
3164
3165 return buf.insts_size();
3166 }
3167
3168 void PhaseOutput::install() {
3169 if (!C->should_install_code()) {
3170 return;
3171 } else if (C->stub_function() != nullptr) {
3172 install_stub(C->stub_name());
3173 } else {
3174 install_code(C->method(),
3175 C->entry_bci(),
3176 CompileBroker::compiler2(),
3177 C->has_unsafe_access(),
3178 SharedRuntime::is_wide_vector(C->max_vector_size()));
3179 }
3180 }
3181
3182 void PhaseOutput::install_code(ciMethod* target,
3183 int entry_bci,
3184 AbstractCompiler* compiler,
3185 bool has_unsafe_access,
3186 bool has_wide_vectors) {
3187 // Check if we want to skip execution of all compiled code.
3188 {
3189 #ifndef PRODUCT
3190 if (OptoNoExecute) {
3191 C->record_method_not_compilable("+OptoNoExecute"); // Flag as failed
3192 return;
3193 }
3194 #endif
3195 Compile::TracePhase tp(_t_registerMethod);
3196
3197 if (C->is_osr_compilation()) {
3198 _code_offsets.set_value(CodeOffsets::Verified_Entry, 0);
3199 _code_offsets.set_value(CodeOffsets::OSR_Entry, _first_block_size);
3200 } else {
3201 if (!target->is_static()) {
3202 // The UEP of an nmethod ensures that the VEP is padded. However, the padding of the UEP is placed
3203 // before the inline cache check, so we don't have to execute any nop instructions when dispatching
3204 // through the UEP, yet we can ensure that the VEP is aligned appropriately.
3205 _code_offsets.set_value(CodeOffsets::Entry, _first_block_size - MacroAssembler::ic_check_size());
3206 }
3207 _code_offsets.set_value(CodeOffsets::Verified_Entry, _first_block_size);
3208 _code_offsets.set_value(CodeOffsets::OSR_Entry, 0);
3209 }
3210
3211 C->env()->register_method(target,
3212 entry_bci,
3213 &_code_offsets,
3214 _orig_pc_slot_offset_in_bytes,
3215 code_buffer(),
3216 frame_size_in_words(),
3217 oop_map_set(),
3218 &_handler_table,
3219 inc_table(),
3220 compiler,
3221 has_unsafe_access,
3222 SharedRuntime::is_wide_vector(C->max_vector_size()),
3223 C->has_monitors(),
3224 C->has_scoped_access(),
3225 0);
3226
3227 if (C->log() != nullptr) { // Print code cache state into compiler log
3228 C->log()->code_cache_state();
3229 }
3230 }
3231 }
3232 void PhaseOutput::install_stub(const char* stub_name) {
3233 // Entry point will be accessed using stub_entry_point();
3234 if (code_buffer() == nullptr) {
3235 Matcher::soft_match_failure();
3236 } else {
3237 if (PrintAssembly && (WizardMode || Verbose))
3238 tty->print_cr("### Stub::%s", stub_name);
3239
3240 if (!C->failing()) {
3241 assert(C->fixed_slots() == 0, "no fixed slots used for runtime stubs");
3242
3243 // Make the NMethod
3244 // For now we mark the frame as never safe for profile stackwalking
3245 RuntimeStub *rs = RuntimeStub::new_runtime_stub(stub_name,
|
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 "asm/assembler.inline.hpp"
26 #include "code/aotCodeCache.hpp"
27 #include "code/compiledIC.hpp"
28 #include "code/debugInfo.hpp"
29 #include "code/debugInfoRec.hpp"
30 #include "compiler/compileBroker.hpp"
31 #include "compiler/compilerDirectives.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "compiler/oopMap.hpp"
34 #include "gc/shared/barrierSet.hpp"
35 #include "gc/shared/c2/barrierSetC2.hpp"
36 #include "gc/shared/gc_globals.hpp"
37 #include "memory/allocation.hpp"
38 #include "opto/ad.hpp"
39 #include "opto/block.hpp"
40 #include "opto/c2_MacroAssembler.hpp"
41 #include "opto/c2compiler.hpp"
42 #include "opto/callnode.hpp"
43 #include "opto/cfgnode.hpp"
44 #include "opto/locknode.hpp"
45 #include "opto/machnode.hpp"
46 #include "opto/node.hpp"
47 #include "opto/optoreg.hpp"
48 #include "opto/output.hpp"
49 #include "opto/regalloc.hpp"
50 #include "opto/type.hpp"
51 #include "runtime/sharedRuntime.hpp"
52 #include "utilities/macros.hpp"
53 #include "utilities/powerOfTwo.hpp"
54 #include "utilities/xmlstream.hpp"
55
56 #ifndef PRODUCT
213 _first_block_size(0),
214 _handler_table(),
215 _inc_table(),
216 _stub_list(),
217 _oop_map_set(nullptr),
218 _scratch_buffer_blob(nullptr),
219 _scratch_locs_memory(nullptr),
220 _scratch_const_size(-1),
221 _in_scratch_emit_size(false),
222 _frame_slots(0),
223 _code_offsets(),
224 _node_bundling_limit(0),
225 _node_bundling_base(nullptr),
226 _orig_pc_slot(0),
227 _orig_pc_slot_offset_in_bytes(0),
228 _buf_sizes(),
229 _block(nullptr),
230 _index(0) {
231 C->set_output(this);
232 if (C->stub_name() == nullptr) {
233 int fixed_slots = C->fixed_slots();
234 if (C->needs_stack_repair()) {
235 fixed_slots -= 2;
236 }
237 // TODO 8284443 Only reserve extra slot if needed
238 if (InlineTypeReturnedAsFields) {
239 fixed_slots -= 2;
240 }
241 _orig_pc_slot = fixed_slots - (sizeof(address) / VMRegImpl::stack_slot_size);
242 }
243 }
244
245 PhaseOutput::~PhaseOutput() {
246 C->set_output(nullptr);
247 if (_scratch_buffer_blob != nullptr) {
248 BufferBlob::free(_scratch_buffer_blob);
249 }
250 }
251
252 void PhaseOutput::perform_mach_node_analysis() {
253 // Late barrier analysis must be done after schedule and bundle
254 // Otherwise liveness based spilling will fail
255 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
256 bs->late_barrier_analysis();
257
258 pd_perform_mach_node_analysis();
259
260 C->print_method(CompilerPhaseType::PHASE_MACH_ANALYSIS, 3);
261 }
262
263 // Convert Nodes to instruction bits and pass off to the VM
264 void PhaseOutput::Output() {
265 // RootNode goes
266 assert( C->cfg()->get_root_block()->number_of_nodes() == 0, "" );
267
268 // The number of new nodes (mostly MachNop) is proportional to
269 // the number of java calls and inner loops which are aligned.
270 if ( C->check_node_count((NodeLimitFudgeFactor + C->java_calls()*3 +
271 C->inner_loops()*(OptoLoopAlignment-1)),
272 "out of nodes before code generation" ) ) {
273 return;
274 }
275 // Make sure I can find the Start Node
276 Block *entry = C->cfg()->get_block(1);
277 Block *broot = C->cfg()->get_root_block();
278
279 const StartNode *start = entry->head()->as_Start();
280
281 // Replace StartNode with prolog
282 Label verified_entry;
283 MachPrologNode* prolog = new MachPrologNode(&verified_entry);
284 entry->map_node(prolog, 0);
285 C->cfg()->map_node_to_block(prolog, entry);
286 C->cfg()->unmap_node_from_block(start); // start is no longer in any block
287
288 // Virtual methods need an unverified entry point
289 if (C->is_osr_compilation()) {
290 if (PoisonOSREntry) {
291 // TODO: Should use a ShouldNotReachHereNode...
292 C->cfg()->insert( broot, 0, new MachBreakpointNode() );
293 }
294 } else {
295 if (C->method()) {
296 if (C->method()->has_scalarized_args()) {
297 // Add entry point to unpack all inline type arguments
298 C->cfg()->insert(broot, 0, new MachVEPNode(&verified_entry, /* verified */ true, /* receiver_only */ false));
299 if (!C->method()->is_static()) {
300 // Add verified/unverified entry points to only unpack inline type receiver at interface calls
301 C->cfg()->insert(broot, 0, new MachVEPNode(&verified_entry, /* verified */ false, /* receiver_only */ false));
302 C->cfg()->insert(broot, 0, new MachVEPNode(&verified_entry, /* verified */ true, /* receiver_only */ true));
303 C->cfg()->insert(broot, 0, new MachVEPNode(&verified_entry, /* verified */ false, /* receiver_only */ true));
304 }
305 } else if (!C->method()->is_static()) {
306 // Insert unvalidated entry point
307 C->cfg()->insert(broot, 0, new MachUEPNode());
308 }
309 }
310 }
311
312 // Break before main entry point
313 if ((C->method() && C->directive()->BreakAtExecuteOption) ||
314 (OptoBreakpoint && C->is_method_compilation()) ||
315 (OptoBreakpointOSR && C->is_osr_compilation()) ||
316 (OptoBreakpointC2R && !C->method()) ) {
317 // checking for C->method() means that OptoBreakpoint does not apply to
318 // runtime stubs or frame converters
319 C->cfg()->insert( entry, 1, new MachBreakpointNode() );
320 }
321
322 // Insert epilogs before every return
323 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
324 Block* block = C->cfg()->get_block(i);
325 if (!block->is_connector() && block->non_connector_successor(0) == C->cfg()->get_root_block()) { // Found a program exit point?
326 Node* m = block->end();
327 if (m->is_Mach() && m->as_Mach()->ideal_Opcode() != Op_Halt) {
328 MachEpilogNode* epilog = new MachEpilogNode(m->as_Mach()->ideal_Opcode() == Op_Return);
329 block->add_inst(epilog);
330 C->cfg()->map_node_to_block(epilog, block);
331 }
332 }
333 }
334
335 // Keeper of sizing aspects
336 _buf_sizes = BufferSizingData();
337
338 // Initialize code buffer
339 estimate_buffer_size(_buf_sizes._const);
340 if (C->failing()) return;
341
342 // Pre-compute the length of blocks and replace
343 // long branches with short if machine supports it.
344 // Must be done before ScheduleAndBundle due to SPARC delay slots
345 uint* blk_starts = NEW_RESOURCE_ARRAY(uint, C->cfg()->number_of_blocks() + 1);
346 blk_starts[0] = 0;
347 shorten_branches(blk_starts);
348
349 if (!C->is_osr_compilation() && C->has_scalarized_args()) {
350 // Compute the offsets of the entry points required by the inline type calling convention
351 if (!C->method()->is_static()) {
352 // We have entries at the beginning of the method, implemented by the first 4 nodes.
353 // Entry (unverified) @ offset 0
354 // Verified_Inline_Entry_RO
355 // Inline_Entry (unverified)
356 // Verified_Inline_Entry
357 uint offset = 0;
358 _code_offsets.set_value(CodeOffsets::Entry, offset);
359
360 offset += ((MachVEPNode*)broot->get_node(0))->size(C->regalloc());
361 _code_offsets.set_value(CodeOffsets::Verified_Inline_Entry_RO, offset);
362
363 offset += ((MachVEPNode*)broot->get_node(1))->size(C->regalloc());
364 _code_offsets.set_value(CodeOffsets::Inline_Entry, offset);
365
366 offset += ((MachVEPNode*)broot->get_node(2))->size(C->regalloc());
367 _code_offsets.set_value(CodeOffsets::Verified_Inline_Entry, offset);
368 } else {
369 _code_offsets.set_value(CodeOffsets::Entry, -1); // will be patched later
370 _code_offsets.set_value(CodeOffsets::Verified_Inline_Entry, 0);
371 }
372 }
373
374 ScheduleAndBundle();
375 if (C->failing()) {
376 return;
377 }
378
379 perform_mach_node_analysis();
380
381 // Complete sizing of codebuffer
382 CodeBuffer* cb = init_buffer();
383 if (cb == nullptr || C->failing()) {
384 return;
385 }
386
387 BuildOopMaps();
388
389 if (C->failing()) {
390 return;
391 }
392
393 C2_MacroAssembler masm(cb);
515 // Sum all instruction sizes to compute block size
516 uint last_inst = block->number_of_nodes();
517 uint blk_size = 0;
518 for (uint j = 0; j < last_inst; j++) {
519 _index = j;
520 Node* nj = block->get_node(_index);
521 // Handle machine instruction nodes
522 if (nj->is_Mach()) {
523 MachNode* mach = nj->as_Mach();
524 blk_size += (mach->alignment_required() - 1) * relocInfo::addr_unit(); // assume worst case padding
525 reloc_size += mach->reloc();
526 if (mach->is_MachCall()) {
527 // add size information for trampoline stub
528 // class CallStubImpl is platform-specific and defined in the *.ad files.
529 stub_size += CallStubImpl::size_call_trampoline();
530 reloc_size += CallStubImpl::reloc_call_trampoline();
531
532 MachCallNode *mcall = mach->as_MachCall();
533 // This destination address is NOT PC-relative
534
535 if (mcall->entry_point() != nullptr) {
536 mcall->method_set((intptr_t)mcall->entry_point());
537 }
538
539 if (mcall->is_MachCallJava() && mcall->as_MachCallJava()->_method) {
540 stub_size += CompiledDirectCall::to_interp_stub_size();
541 reloc_size += CompiledDirectCall::reloc_to_interp_stub();
542 }
543 } else if (mach->is_MachSafePoint()) {
544 // If call/safepoint are adjacent, account for possible
545 // nop to disambiguate the two safepoints.
546 // ScheduleAndBundle() can rearrange nodes in a block,
547 // check for all offsets inside this block.
548 if (last_call_adr >= blk_starts[i]) {
549 blk_size += nop_size;
550 }
551 }
552 if (mach->avoid_back_to_back(MachNode::AVOID_BEFORE)) {
553 // Nop is inserted between "avoid back to back" instructions.
554 // ScheduleAndBundle() can rearrange nodes in a block,
555 // check for all offsets inside this block.
556 if (last_avoid_back_to_back_adr >= blk_starts[i]) {
557 blk_size += nop_size;
772 // New functionality:
773 // Assert if the local is not top. In product mode let the new node
774 // override the old entry.
775 assert(local == C->top(), "LocArray collision");
776 if (local == C->top()) {
777 return;
778 }
779 array->pop();
780 }
781 const Type *t = local->bottom_type();
782
783 // Is it a safepoint scalar object node?
784 if (local->is_SafePointScalarObject()) {
785 SafePointScalarObjectNode* spobj = local->as_SafePointScalarObject();
786
787 ObjectValue* sv = sv_for_node_id(objs, spobj->_idx);
788 if (sv == nullptr) {
789 ciKlass* cik = t->is_oopptr()->exact_klass();
790 assert(cik->is_instance_klass() ||
791 cik->is_array_klass(), "Not supported allocation.");
792 uint first_ind = spobj->first_index(sfpt->jvms());
793 // Nullable, scalarized inline types have a null_marker input
794 // that needs to be checked before using the field values.
795 ScopeValue* properties = nullptr;
796 if (cik->is_inlinetype()) {
797 Node* null_marker_node = sfpt->in(first_ind++);
798 assert(null_marker_node != nullptr, "null_marker node not found");
799 if (!null_marker_node->is_top()) {
800 const TypeInt* null_marker_type = null_marker_node->bottom_type()->is_int();
801 if (null_marker_node->is_Con()) {
802 properties = new ConstantIntValue(null_marker_type->get_con());
803 } else {
804 OptoReg::Name null_marker_reg = C->regalloc()->get_reg_first(null_marker_node);
805 properties = new_loc_value(C->regalloc(), null_marker_reg, Location::normal);
806 }
807 }
808 }
809 if (cik->is_array_klass() && !cik->is_type_array_klass()) {
810 jint props = ArrayKlass::ArrayProperties::DEFAULT;
811 if (cik->as_array_klass()->element_klass()->is_inlinetype()) {
812 if (cik->as_array_klass()->is_elem_null_free()) {
813 props |= ArrayKlass::ArrayProperties::NULL_RESTRICTED;
814 }
815 if (!cik->as_array_klass()->is_elem_atomic()) {
816 props |= ArrayKlass::ArrayProperties::NON_ATOMIC;
817 }
818 }
819 properties = new ConstantIntValue(props);
820 }
821 sv = new ObjectValue(spobj->_idx,
822 new ConstantOopWriteValue(cik->java_mirror()->constant_encoding()), true, properties);
823 set_sv_for_object_node(objs, sv);
824
825 for (uint i = 0; i < spobj->n_fields(); i++) {
826 Node* fld_node = sfpt->in(first_ind+i);
827 (void)FillLocArray(sv->field_values()->length(), sfpt, fld_node, sv->field_values(), objs);
828 }
829 }
830 array->append(sv);
831 return;
832 } else if (local->is_SafePointScalarMerge()) {
833 SafePointScalarMergeNode* smerge = local->as_SafePointScalarMerge();
834 ObjectMergeValue* mv = (ObjectMergeValue*) sv_for_node_id(objs, smerge->_idx);
835
836 if (mv == nullptr) {
837 GrowableArray<ScopeValue*> deps;
838
839 int merge_pointer_idx = smerge->merge_pointer_idx(sfpt->jvms());
840 (void)FillLocArray(0, sfpt, sfpt->in(merge_pointer_idx), &deps, objs);
841 assert(deps.length() == 1, "missing value");
842
843 int selector_idx = smerge->selector_idx(sfpt->jvms());
844 (void)FillLocArray(1, nullptr, sfpt->in(selector_idx), &deps, nullptr);
1050 if (!n->is_SafePointScalarObject()) {
1051 continue;
1052 }
1053
1054 ObjectValue* other = sv_for_node_id(objs, n->_idx);
1055 if (ov == other) {
1056 return true;
1057 }
1058 }
1059 return false;
1060 }
1061
1062 //--------------------------Process_OopMap_Node--------------------------------
1063 void PhaseOutput::Process_OopMap_Node(MachNode *mach, int current_offset) {
1064 // Handle special safepoint nodes for synchronization
1065 MachSafePointNode *sfn = mach->as_MachSafePoint();
1066 MachCallNode *mcall;
1067
1068 int safepoint_pc_offset = current_offset;
1069 bool return_oop = false;
1070 bool return_scalarized = false;
1071 bool has_ea_local_in_scope = sfn->_has_ea_local_in_scope;
1072 bool arg_escape = false;
1073
1074 // Add the safepoint in the DebugInfoRecorder
1075 if( !mach->is_MachCall() ) {
1076 mcall = nullptr;
1077 C->debug_info()->add_safepoint(safepoint_pc_offset, sfn->_oop_map);
1078 } else {
1079 mcall = mach->as_MachCall();
1080
1081 if (mcall->is_MachCallJava()) {
1082 arg_escape = mcall->as_MachCallJava()->_arg_escape;
1083 }
1084
1085 // Check if a call returns an object.
1086 if (mcall->returns_pointer() || mcall->returns_scalarized()) {
1087 return_oop = true;
1088 }
1089 if (mcall->returns_scalarized()) {
1090 return_scalarized = true;
1091 }
1092 safepoint_pc_offset += mcall->ret_addr_offset();
1093 C->debug_info()->add_safepoint(safepoint_pc_offset, mcall->_oop_map);
1094 }
1095
1096 // Loop over the JVMState list to add scope information
1097 // Do not skip safepoints with a null method, they need monitor info
1098 JVMState* youngest_jvms = sfn->jvms();
1099 int max_depth = youngest_jvms->depth();
1100
1101 // Allocate the object pool for scalar-replaced objects -- the map from
1102 // small-integer keys (which can be recorded in the local and ostack
1103 // arrays) to descriptions of the object state.
1104 GrowableArray<ScopeValue*> *objs = new GrowableArray<ScopeValue*>();
1105
1106 // Visit scopes from oldest to youngest.
1107 for (int depth = 1; depth <= max_depth; depth++) {
1108 JVMState* jvms = youngest_jvms->of_depth(depth);
1109 int idx;
1110 ciMethod* method = jvms->has_method() ? jvms->method() : nullptr;
1111 // Safepoints that do not have method() set only provide oop-map and monitor info
1140 // Build the growable array of ScopeValues for exp stack
1141 GrowableArray<MonitorValue*> *monarray = new GrowableArray<MonitorValue*>(num_mon);
1142
1143 // Loop over monitors and insert into array
1144 for (idx = 0; idx < num_mon; idx++) {
1145 // Grab the node that defines this monitor
1146 Node* box_node = sfn->monitor_box(jvms, idx);
1147 Node* obj_node = sfn->monitor_obj(jvms, idx);
1148
1149 // Create ScopeValue for object
1150 ScopeValue *scval = nullptr;
1151
1152 if (obj_node->is_SafePointScalarObject()) {
1153 SafePointScalarObjectNode* spobj = obj_node->as_SafePointScalarObject();
1154 scval = PhaseOutput::sv_for_node_id(objs, spobj->_idx);
1155 if (scval == nullptr) {
1156 const Type *t = spobj->bottom_type();
1157 ciKlass* cik = t->is_oopptr()->exact_klass();
1158 assert(cik->is_instance_klass() ||
1159 cik->is_array_klass(), "Not supported allocation.");
1160 assert(!cik->is_inlinetype(), "Synchronization on value object?");
1161 ScopeValue* properties = nullptr;
1162 if (cik->is_array_klass() && !cik->is_type_array_klass()) {
1163 jint props = ArrayKlass::ArrayProperties::DEFAULT;
1164 if (cik->as_array_klass()->element_klass()->is_inlinetype()) {
1165 if (cik->as_array_klass()->is_elem_null_free()) {
1166 props |= ArrayKlass::ArrayProperties::NULL_RESTRICTED;
1167 }
1168 if (!cik->as_array_klass()->is_elem_atomic()) {
1169 props |= ArrayKlass::ArrayProperties::NON_ATOMIC;
1170 }
1171 }
1172 properties = new ConstantIntValue(props);
1173 }
1174 ObjectValue* sv = new ObjectValue(spobj->_idx,
1175 new ConstantOopWriteValue(cik->java_mirror()->constant_encoding()), true, properties);
1176 PhaseOutput::set_sv_for_object_node(objs, sv);
1177
1178 uint first_ind = spobj->first_index(youngest_jvms);
1179 for (uint i = 0; i < spobj->n_fields(); i++) {
1180 Node* fld_node = sfn->in(first_ind+i);
1181 (void)FillLocArray(sv->field_values()->length(), sfn, fld_node, sv->field_values(), objs);
1182 }
1183 scval = sv;
1184 }
1185 } else if (obj_node->is_SafePointScalarMerge()) {
1186 SafePointScalarMergeNode* smerge = obj_node->as_SafePointScalarMerge();
1187 ObjectMergeValue* mv = (ObjectMergeValue*) sv_for_node_id(objs, smerge->_idx);
1188
1189 if (mv == nullptr) {
1190 GrowableArray<ScopeValue*> deps;
1191
1192 int merge_pointer_idx = smerge->merge_pointer_idx(youngest_jvms);
1193 FillLocArray(0, sfn, sfn->in(merge_pointer_idx), &deps, objs);
1194 assert(deps.length() == 1, "missing value");
1195
1262 DebugToken *locvals = C->debug_info()->create_scope_values(locarray);
1263 DebugToken *expvals = C->debug_info()->create_scope_values(exparray);
1264 DebugToken *monvals = C->debug_info()->create_monitor_values(monarray);
1265
1266 // Make method available for all Safepoints
1267 ciMethod* scope_method = method ? method : C->method();
1268 // Describe the scope here
1269 assert(jvms->bci() >= InvocationEntryBci && jvms->bci() <= 0x10000, "must be a valid or entry BCI");
1270 assert(!jvms->should_reexecute() || depth == max_depth, "reexecute allowed only for the youngest");
1271 // Now we can describe the scope.
1272 methodHandle null_mh;
1273 bool rethrow_exception = false;
1274 C->debug_info()->describe_scope(
1275 safepoint_pc_offset,
1276 null_mh,
1277 scope_method,
1278 jvms->bci(),
1279 jvms->should_reexecute(),
1280 rethrow_exception,
1281 return_oop,
1282 return_scalarized,
1283 has_ea_local_in_scope,
1284 arg_escape,
1285 locvals,
1286 expvals,
1287 monvals
1288 );
1289 } // End jvms loop
1290
1291 // Mark the end of the scope set.
1292 C->debug_info()->end_safepoint(safepoint_pc_offset);
1293 }
1294
1295
1296
1297 // A simplified version of Process_OopMap_Node, to handle non-safepoints.
1298 class NonSafepointEmitter {
1299 Compile* C;
1300 JVMState* _pending_jvms;
1301 int _pending_offset;
1302
1618 MachNode *nop = new MachNopNode(nops_cnt);
1619 block->insert_node(nop, j++);
1620 last_inst++;
1621 C->cfg()->map_node_to_block(nop, block);
1622 // Ensure enough space.
1623 masm->code()->insts()->maybe_expand_to_ensure_remaining(MAX_inst_size);
1624 if ((masm->code()->blob() == nullptr) || (!CompileBroker::should_compile_new_jobs())) {
1625 C->record_failure("CodeCache is full");
1626 return;
1627 }
1628 nop->emit(masm, C->regalloc());
1629 masm->code()->flush_bundle(true);
1630 current_offset = masm->offset();
1631 }
1632
1633 bool observe_safepoint = is_sfn;
1634 // Remember the start of the last call in a basic block
1635 if (is_mcall) {
1636 MachCallNode *mcall = mach->as_MachCall();
1637
1638 if (mcall->entry_point() != nullptr) {
1639 // This destination address is NOT PC-relative
1640 mcall->method_set((intptr_t)mcall->entry_point());
1641 }
1642
1643 // Save the return address
1644 call_returns[block->_pre_order] = current_offset + mcall->ret_addr_offset();
1645
1646 observe_safepoint = mcall->guaranteed_safepoint();
1647 }
1648
1649 // sfn will be valid whenever mcall is valid now because of inheritance
1650 if (observe_safepoint) {
1651 // Handle special safepoint nodes for synchronization
1652 if (!is_mcall) {
1653 MachSafePointNode *sfn = mach->as_MachSafePoint();
1654 // !!!!! Stubs only need an oopmap right now, so bail out
1655 if (sfn->jvms()->method() == nullptr) {
1656 // Write the oopmap directly to the code blob??!!
1657 continue;
1658 }
1659 } // End synchronization
1660
1661 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(),
1759 if ((node_offsets != nullptr) && (n->_idx < node_offset_limit)) {
1760 node_offsets[n->_idx] = masm->offset();
1761 }
1762 #endif
1763 assert(!C->failing_internal() || C->failure_is_artificial(), "Should not reach here if failing.");
1764
1765 // "Normal" instruction case
1766 DEBUG_ONLY(uint instr_offset = masm->offset());
1767 n->emit(masm, C->regalloc());
1768 current_offset = masm->offset();
1769
1770 // Above we only verified that there is enough space in the instruction section.
1771 // However, the instruction may emit stubs that cause code buffer expansion.
1772 // Bail out here if expansion failed due to a lack of code cache space.
1773 if (C->failing()) {
1774 return;
1775 }
1776
1777 assert(!is_mcall || (call_returns[block->_pre_order] <= (uint)current_offset),
1778 "ret_addr_offset() not within emitted code");
1779 #ifdef ASSERT
1780 uint n_size = n->size(C->regalloc());
1781 if (n_size < (current_offset-instr_offset)) {
1782 MachNode* mach = n->as_Mach();
1783 n->dump();
1784 mach->dump_format(C->regalloc(), tty);
1785 tty->print_cr(" n_size (%d), current_offset (%d), instr_offset (%d)", n_size, current_offset, instr_offset);
1786 Disassembler::decode(masm->code()->insts_begin() + instr_offset, masm->code()->insts_begin() + current_offset + 1, tty);
1787 tty->print_cr(" ------------------- ");
1788 BufferBlob* blob = this->scratch_buffer_blob();
1789 address blob_begin = blob->content_begin();
1790 Disassembler::decode(blob_begin, blob_begin + n_size + 1, tty);
1791 assert(false, "wrong size of mach node");
1792 }
1793 #endif
1794 non_safepoints.observe_instruction(n, current_offset);
1795
1796 // mcall is last "call" that can be a safepoint
1797 // record it so we can see if a poll will directly follow it
1798 // in which case we'll need a pad to make the PcDesc sites unique
3015 anti_do_use( b, n, _regalloc->get_reg_first(def) );
3016 anti_do_use( b, n, _regalloc->get_reg_second(def) );
3017 }
3018 }
3019 // Do not allow defs of new derived values to float above GC
3020 // points unless the base is definitely available at the GC point.
3021
3022 Node *m = b->get_node(i);
3023
3024 // Add precedence edge from following safepoint to use of derived pointer
3025 if( last_safept_node != end_node &&
3026 m != last_safept_node) {
3027 for (uint k = 1; k < m->req(); k++) {
3028 const Type *t = m->in(k)->bottom_type();
3029 if( t->isa_oop_ptr() &&
3030 t->is_ptr()->offset() != 0 ) {
3031 last_safept_node->add_prec( m );
3032 break;
3033 }
3034 }
3035
3036 // Do not allow a CheckCastPP node whose input is a raw pointer to
3037 // float past a safepoint. This can occur when a buffered inline
3038 // type is allocated in a loop and the CheckCastPP from that
3039 // allocation is reused outside the loop. If the use inside the
3040 // loop is scalarized the CheckCastPP will no longer be connected
3041 // to the loop safepoint. See JDK-8264340.
3042 if (m->is_Mach() && m->as_Mach()->ideal_Opcode() == Op_CheckCastPP) {
3043 Node *def = m->in(1);
3044 if (def != nullptr && def->bottom_type()->base() == Type::RawPtr) {
3045 last_safept_node->add_prec(m);
3046 }
3047 }
3048 }
3049
3050 if( n->jvms() ) { // Precedence edge from derived to safept
3051 // Check if last_safept_node was moved by pinch-point insertion in anti_do_use()
3052 if( b->get_node(last_safept) != last_safept_node ) {
3053 last_safept = b->find_node(last_safept_node);
3054 }
3055 for( uint j=last_safept; j > i; j-- ) {
3056 Node *mach = b->get_node(j);
3057 if( mach->is_Mach() && mach->as_Mach()->ideal_Opcode() == Op_AddP )
3058 mach->add_prec( n );
3059 }
3060 last_safept = i;
3061 last_safept_node = m;
3062 }
3063 }
3064
3065 if (fat_proj_seen) {
3066 // Garbage collect pinch nodes that were not consumed.
3067 // They are usually created by a fat kill MachProj for a call.
3176 }
3177 #endif
3178
3179 //-----------------------init_scratch_buffer_blob------------------------------
3180 // Construct a temporary BufferBlob and cache it for this compile.
3181 void PhaseOutput::init_scratch_buffer_blob(int const_size) {
3182 // If there is already a scratch buffer blob allocated and the
3183 // constant section is big enough, use it. Otherwise free the
3184 // current and allocate a new one.
3185 BufferBlob* blob = scratch_buffer_blob();
3186 if ((blob != nullptr) && (const_size <= _scratch_const_size)) {
3187 // Use the current blob.
3188 } else {
3189 if (blob != nullptr) {
3190 BufferBlob::free(blob);
3191 }
3192
3193 ResourceMark rm;
3194 _scratch_const_size = const_size;
3195 int size = C2Compiler::initial_code_buffer_size(const_size);
3196 if (C->has_scalarized_args()) {
3197 // Inline type entry points (MachVEPNodes) require lots of space for GC barriers and oop verification
3198 // when loading object fields from the buffered argument. Increase scratch buffer size accordingly.
3199 ciMethod* method = C->method();
3200 int barrier_size = UseZGC ? 200 : (7 DEBUG_ONLY(+ 37));
3201 int arg_num = 0;
3202 if (!method->is_static()) {
3203 if (method->is_scalarized_arg(arg_num)) {
3204 size += method->holder()->as_inline_klass()->oop_count() * barrier_size;
3205 }
3206 arg_num++;
3207 }
3208 for (ciSignatureStream str(method->signature()); !str.at_return_type(); str.next()) {
3209 if (method->is_scalarized_arg(arg_num)) {
3210 size += str.type()->as_inline_klass()->oop_count() * barrier_size;
3211 }
3212 arg_num++;
3213 }
3214 }
3215 blob = BufferBlob::create("Compile::scratch_buffer", size);
3216 // Record the buffer blob for next time.
3217 set_scratch_buffer_blob(blob);
3218 // Have we run out of code space?
3219 if (scratch_buffer_blob() == nullptr) {
3220 // Let CompilerBroker disable further compilations.
3221 C->record_failure("Not enough space for scratch buffer in CodeCache");
3222 return;
3223 }
3224 }
3225
3226 // Initialize the relocation buffers
3227 relocInfo* locs_buf = (relocInfo*) blob->content_end() - MAX_locs_size;
3228 set_scratch_locs_memory(locs_buf);
3229 }
3230
3231
3232 //-----------------------scratch_emit_size-------------------------------------
3233 // Helper function that computes size by emitting code
3234 uint PhaseOutput::scratch_emit_size(const Node* n) {
3265 buf.insts()->set_scratch_emit();
3266 buf.stubs()->set_scratch_emit();
3267
3268 // Do the emission.
3269
3270 Label fakeL; // Fake label for branch instructions.
3271 Label* saveL = nullptr;
3272 uint save_bnum = 0;
3273 bool is_branch = n->is_MachBranch();
3274 C2_MacroAssembler masm(&buf);
3275 masm.bind(fakeL);
3276 if (is_branch) {
3277 n->as_MachBranch()->save_label(&saveL, &save_bnum);
3278 n->as_MachBranch()->label_set(&fakeL, 0);
3279 }
3280 n->emit(&masm, C->regalloc());
3281
3282 // Emitting into the scratch buffer should not fail
3283 assert(!C->failing_internal() || C->failure_is_artificial(), "Must not have pending failure. Reason is: %s", C->failure_reason());
3284
3285 // Restore label.
3286 if (is_branch) {
3287 n->as_MachBranch()->label_set(saveL, save_bnum);
3288 }
3289
3290 // End scratch_emit_size section.
3291 set_in_scratch_emit_size(false);
3292
3293 return buf.insts_size();
3294 }
3295
3296 void PhaseOutput::install() {
3297 if (!C->should_install_code()) {
3298 return;
3299 } else if (C->stub_function() != nullptr) {
3300 install_stub(C->stub_name());
3301 } else {
3302 install_code(C->method(),
3303 C->entry_bci(),
3304 CompileBroker::compiler2(),
3305 C->has_unsafe_access(),
3306 SharedRuntime::is_wide_vector(C->max_vector_size()));
3307 }
3308 }
3309
3310 void PhaseOutput::install_code(ciMethod* target,
3311 int entry_bci,
3312 AbstractCompiler* compiler,
3313 bool has_unsafe_access,
3314 bool has_wide_vectors) {
3315 // Check if we want to skip execution of all compiled code.
3316 {
3317 #ifndef PRODUCT
3318 if (OptoNoExecute) {
3319 C->record_method_not_compilable("+OptoNoExecute"); // Flag as failed
3320 return;
3321 }
3322 #endif
3323 Compile::TracePhase tp(_t_registerMethod);
3324
3325 if (C->is_osr_compilation()) {
3326 _code_offsets.set_value(CodeOffsets::Verified_Entry, 0);
3327 _code_offsets.set_value(CodeOffsets::OSR_Entry, _first_block_size);
3328 } else {
3329 _code_offsets.set_value(CodeOffsets::Verified_Entry, _first_block_size);
3330 if (_code_offsets.value(CodeOffsets::Verified_Inline_Entry) == -1) {
3331 _code_offsets.set_value(CodeOffsets::Verified_Inline_Entry, _first_block_size);
3332 }
3333 if (_code_offsets.value(CodeOffsets::Verified_Inline_Entry_RO) == -1) {
3334 _code_offsets.set_value(CodeOffsets::Verified_Inline_Entry_RO, _first_block_size);
3335 }
3336 if (_code_offsets.value(CodeOffsets::Entry) == -1) {
3337 _code_offsets.set_value(CodeOffsets::Entry, _first_block_size);
3338 }
3339 _code_offsets.set_value(CodeOffsets::OSR_Entry, 0);
3340 }
3341
3342 C->env()->register_method(target,
3343 entry_bci,
3344 &_code_offsets,
3345 _orig_pc_slot_offset_in_bytes,
3346 code_buffer(),
3347 frame_size_in_words(),
3348 _oop_map_set,
3349 &_handler_table,
3350 inc_table(),
3351 compiler,
3352 has_unsafe_access,
3353 SharedRuntime::is_wide_vector(C->max_vector_size()),
3354 C->has_monitors(),
3355 C->has_scoped_access(),
3356 0);
3357
3358 if (C->log() != nullptr) { // Print code cache state into compiler log
3359 C->log()->code_cache_state();
3360 }
3361 }
3362 }
3363 void PhaseOutput::install_stub(const char* stub_name) {
3364 // Entry point will be accessed using stub_entry_point();
3365 if (code_buffer() == nullptr) {
3366 Matcher::soft_match_failure();
3367 } else {
3368 if (PrintAssembly && (WizardMode || Verbose))
3369 tty->print_cr("### Stub::%s", stub_name);
3370
3371 if (!C->failing()) {
3372 assert(C->fixed_slots() == 0, "no fixed slots used for runtime stubs");
3373
3374 // Make the NMethod
3375 // For now we mark the frame as never safe for profile stackwalking
3376 RuntimeStub *rs = RuntimeStub::new_runtime_stub(stub_name,
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