summaryrefslogtreecommitdiffstats
path: root/js/src/jit/IonBuilder.h
blob: 1f763a4f2c01bcf781a74e1bced850e051ae0d74 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=8 sts=4 et sw=4 tw=99:
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef jit_IonBuilder_h
#define jit_IonBuilder_h

// This file declares the data structures for building a MIRGraph from a
// JSScript.

#include "mozilla/LinkedList.h"

#include "jit/BaselineInspector.h"
#include "jit/BytecodeAnalysis.h"
#include "jit/IonAnalysis.h"
#include "jit/IonOptimizationLevels.h"
#include "jit/MIR.h"
#include "jit/MIRGenerator.h"
#include "jit/MIRGraph.h"
#include "jit/OptimizationTracking.h"

namespace js {
namespace jit {

class CodeGenerator;
class CallInfo;
class BaselineFrameInspector;

enum class InlinableNative : uint16_t;

// Records information about a baseline frame for compilation that is stable
// when later used off thread.
BaselineFrameInspector*
NewBaselineFrameInspector(TempAllocator* temp, BaselineFrame* frame, CompileInfo* info);

class IonBuilder
  : public MIRGenerator,
    public mozilla::LinkedListElement<IonBuilder>
{
    enum ControlStatus {
        ControlStatus_Error,
        ControlStatus_Abort,
        ControlStatus_Ended,        // There is no continuation/join point.
        ControlStatus_Joined,       // Created a join node.
        ControlStatus_Jumped,       // Parsing another branch at the same level.
        ControlStatus_None          // No control flow.
    };

    struct DeferredEdge : public TempObject
    {
        MBasicBlock* block;
        DeferredEdge* next;

        DeferredEdge(MBasicBlock* block, DeferredEdge* next)
          : block(block), next(next)
        { }
    };

    struct ControlFlowInfo {
        // Entry in the cfgStack.
        uint32_t cfgEntry;

        // Label that continues go to.
        jsbytecode* continuepc;

        ControlFlowInfo(uint32_t cfgEntry, jsbytecode* continuepc)
          : cfgEntry(cfgEntry),
            continuepc(continuepc)
        { }
    };

    // To avoid recursion, the bytecode analyzer uses a stack where each entry
    // is a small state machine. As we encounter branches or jumps in the
    // bytecode, we push information about the edges on the stack so that the
    // CFG can be built in a tree-like fashion.
    struct CFGState {
        enum State {
            IF_TRUE,            // if() { }, no else.
            IF_TRUE_EMPTY_ELSE, // if() { }, empty else
            IF_ELSE_TRUE,       // if() { X } else { }
            IF_ELSE_FALSE,      // if() { } else { X }
            DO_WHILE_LOOP_BODY, // do { x } while ()
            DO_WHILE_LOOP_COND, // do { } while (x)
            WHILE_LOOP_COND,    // while (x) { }
            WHILE_LOOP_BODY,    // while () { x }
            FOR_LOOP_COND,      // for (; x;) { }
            FOR_LOOP_BODY,      // for (; ;) { x }
            FOR_LOOP_UPDATE,    // for (; ; x) { }
            TABLE_SWITCH,       // switch() { x }
            COND_SWITCH_CASE,   // switch() { case X: ... }
            COND_SWITCH_BODY,   // switch() { case ...: X }
            AND_OR,             // && x, || x
            LABEL,              // label: x
            TRY                 // try { x } catch(e) { }
        };

        State state;            // Current state of this control structure.
        jsbytecode* stopAt;     // Bytecode at which to stop the processing loop.

        // For if structures, this contains branch information.
        union {
            struct {
                MBasicBlock* ifFalse;
                jsbytecode* falseEnd;
                MBasicBlock* ifTrue;    // Set when the end of the true path is reached.
                MTest* test;
            } branch;
            struct {
                // Common entry point.
                MBasicBlock* entry;

                // Whether OSR is being performed for this loop.
                bool osr;

                // Position of where the loop body starts and ends.
                jsbytecode* bodyStart;
                jsbytecode* bodyEnd;

                // pc immediately after the loop exits.
                jsbytecode* exitpc;

                // pc for 'continue' jumps.
                jsbytecode* continuepc;

                // Common exit point. Created lazily, so it may be nullptr.
                MBasicBlock* successor;

                // Deferred break and continue targets.
                DeferredEdge* breaks;
                DeferredEdge* continues;

                // Initial state, in case loop processing is restarted.
                State initialState;
                jsbytecode* initialPc;
                jsbytecode* initialStopAt;
                jsbytecode* loopHead;

                // For-loops only.
                jsbytecode* condpc;
                jsbytecode* updatepc;
                jsbytecode* updateEnd;
            } loop;
            struct {
                // pc immediately after the switch.
                jsbytecode* exitpc;

                // Deferred break and continue targets.
                DeferredEdge* breaks;

                // MIR instruction
                MTableSwitch* ins;

                // The number of current successor that get mapped into a block.
                uint32_t currentBlock;

            } tableswitch;
            struct {
                // Vector of body blocks to process after the cases.
                FixedList<MBasicBlock*>* bodies;

                // When processing case statements, this counter points at the
                // last uninitialized body.  When processing bodies, this
                // counter targets the next body to process.
                uint32_t currentIdx;

                // Remember the block index of the default case.
                jsbytecode* defaultTarget;
                uint32_t defaultIdx;

                // Block immediately after the switch.
                jsbytecode* exitpc;
                DeferredEdge* breaks;
            } condswitch;
            struct {
                DeferredEdge* breaks;
            } label;
            struct {
                MBasicBlock* successor;
            } try_;
        };

        inline bool isLoop() const {
            switch (state) {
              case DO_WHILE_LOOP_COND:
              case DO_WHILE_LOOP_BODY:
              case WHILE_LOOP_COND:
              case WHILE_LOOP_BODY:
              case FOR_LOOP_COND:
              case FOR_LOOP_BODY:
              case FOR_LOOP_UPDATE:
                return true;
              default:
                return false;
            }
        }

        static CFGState If(jsbytecode* join, MTest* test);
        static CFGState IfElse(jsbytecode* trueEnd, jsbytecode* falseEnd, MTest* test);
        static CFGState AndOr(jsbytecode* join, MBasicBlock* lhs);
        static CFGState TableSwitch(jsbytecode* exitpc, MTableSwitch* ins);
        static CFGState CondSwitch(IonBuilder* builder, jsbytecode* exitpc, jsbytecode* defaultTarget);
        static CFGState Label(jsbytecode* exitpc);
        static CFGState Try(jsbytecode* exitpc, MBasicBlock* successor);
    };

    static int CmpSuccessors(const void* a, const void* b);

  public:
    IonBuilder(JSContext* analysisContext, CompileCompartment* comp,
               const JitCompileOptions& options, TempAllocator* temp,
               MIRGraph* graph, CompilerConstraintList* constraints,
               BaselineInspector* inspector, CompileInfo* info,
               const OptimizationInfo* optimizationInfo, BaselineFrameInspector* baselineFrame,
               size_t inliningDepth = 0, uint32_t loopDepth = 0);

    // Callers of build() and buildInline() should always check whether the
    // call overrecursed, if false is returned.  Overrecursion is not
    // signaled as OOM and will not in general be caught by OOM paths.
    MOZ_MUST_USE bool build();
    MOZ_MUST_USE bool buildInline(IonBuilder* callerBuilder, MResumePoint* callerResumePoint,
                                  CallInfo& callInfo);

  private:
    MOZ_MUST_USE bool traverseBytecode();
    ControlStatus snoopControlFlow(JSOp op);
    MOZ_MUST_USE bool processIterators();
    MOZ_MUST_USE bool inspectOpcode(JSOp op);
    uint32_t readIndex(jsbytecode* pc);
    JSAtom* readAtom(jsbytecode* pc);
    bool abort(const char* message, ...) MOZ_FORMAT_PRINTF(2, 3);
    void trackActionableAbort(const char* message);
    void spew(const char* message);

    JSFunction* getSingleCallTarget(TemporaryTypeSet* calleeTypes);
    MOZ_MUST_USE bool getPolyCallTargets(TemporaryTypeSet* calleeTypes, bool constructing,
                                         ObjectVector& targets, uint32_t maxTargets);

    void popCfgStack();
    DeferredEdge* filterDeadDeferredEdges(DeferredEdge* edge);
    MOZ_MUST_USE bool processDeferredContinues(CFGState& state);
    ControlStatus processControlEnd();
    ControlStatus processCfgStack();
    ControlStatus processCfgEntry(CFGState& state);
    ControlStatus processIfEnd(CFGState& state);
    ControlStatus processIfElseTrueEnd(CFGState& state);
    ControlStatus processIfElseFalseEnd(CFGState& state);
    ControlStatus processDoWhileBodyEnd(CFGState& state);
    ControlStatus processDoWhileCondEnd(CFGState& state);
    ControlStatus processWhileCondEnd(CFGState& state);
    ControlStatus processWhileBodyEnd(CFGState& state);
    ControlStatus processForCondEnd(CFGState& state);
    ControlStatus processForBodyEnd(CFGState& state);
    ControlStatus processForUpdateEnd(CFGState& state);
    ControlStatus processNextTableSwitchCase(CFGState& state);
    ControlStatus processCondSwitchCase(CFGState& state);
    ControlStatus processCondSwitchBody(CFGState& state);
    ControlStatus processSwitchBreak(JSOp op);
    ControlStatus processSwitchEnd(DeferredEdge* breaks, jsbytecode* exitpc);
    ControlStatus processAndOrEnd(CFGState& state);
    ControlStatus processLabelEnd(CFGState& state);
    ControlStatus processTryEnd(CFGState& state);
    ControlStatus processReturn(JSOp op);
    ControlStatus processThrow();
    ControlStatus processContinue(JSOp op);
    ControlStatus processBreak(JSOp op, jssrcnote* sn);
    ControlStatus maybeLoop(JSOp op, jssrcnote* sn);
    MOZ_MUST_USE bool pushLoop(CFGState::State state, jsbytecode* stopAt, MBasicBlock* entry,
                               bool osr, jsbytecode* loopHead, jsbytecode* initialPc,
                               jsbytecode* bodyStart, jsbytecode* bodyEnd,
                               jsbytecode* exitpc, jsbytecode* continuepc);
    MOZ_MUST_USE bool analyzeNewLoopTypes(MBasicBlock* entry, jsbytecode* start, jsbytecode* end);

    MBasicBlock* addBlock(MBasicBlock* block, uint32_t loopDepth);
    MBasicBlock* newBlock(MBasicBlock* predecessor, jsbytecode* pc);
    MBasicBlock* newBlock(MBasicBlock* predecessor, jsbytecode* pc, uint32_t loopDepth);
    MBasicBlock* newBlock(MBasicBlock* predecessor, jsbytecode* pc, MResumePoint* priorResumePoint);
    MBasicBlock* newBlockPopN(MBasicBlock* predecessor, jsbytecode* pc, uint32_t popped);
    MBasicBlock* newBlockAfter(MBasicBlock* at, MBasicBlock* predecessor, jsbytecode* pc);
    MBasicBlock* newOsrPreheader(MBasicBlock* header, jsbytecode* loopEntry,
                                 jsbytecode* beforeLoopEntry);
    MBasicBlock* newPendingLoopHeader(MBasicBlock* predecessor, jsbytecode* pc, bool osr, bool canOsr,
                                      unsigned stackPhiCount);
    MBasicBlock* newBlock(jsbytecode* pc) {
        return newBlock(nullptr, pc);
    }
    MBasicBlock* newBlockAfter(MBasicBlock* at, jsbytecode* pc) {
        return newBlockAfter(at, nullptr, pc);
    }

    // We want to make sure that our MTest instructions all check whether the
    // thing being tested might emulate undefined.  So we funnel their creation
    // through this method, to make sure that happens.  We don't want to just do
    // the check in MTest::New, because that can run on background compilation
    // threads, and we're not sure it's safe to touch that part of the typeset
    // from a background thread.
    MTest* newTest(MDefinition* ins, MBasicBlock* ifTrue, MBasicBlock* ifFalse);

    // Given a list of pending breaks, creates a new block and inserts a Goto
    // linking each break to the new block.
    MBasicBlock* createBreakCatchBlock(DeferredEdge* edge, jsbytecode* pc);

    // Finishes loops that do not actually loop, containing only breaks and
    // returns or a do while loop with a condition that is constant false.
    ControlStatus processBrokenLoop(CFGState& state);

    // Computes loop phis, places them in all successors of a loop, then
    // handles any pending breaks.
    ControlStatus finishLoop(CFGState& state, MBasicBlock* successor);

    // Incorporates a type/typeSet into an OSR value for a loop, after the loop
    // body has been processed.
    MOZ_MUST_USE bool addOsrValueTypeBarrier(uint32_t slot, MInstruction** def,
                                             MIRType type, TemporaryTypeSet* typeSet);
    MOZ_MUST_USE bool maybeAddOsrTypeBarriers();

    // Restarts processing of a loop if the type information at its header was
    // incomplete.
    ControlStatus restartLoop(const CFGState& state);

    void assertValidLoopHeadOp(jsbytecode* pc);

    ControlStatus forLoop(JSOp op, jssrcnote* sn);
    ControlStatus whileOrForInLoop(jssrcnote* sn);
    ControlStatus doWhileLoop(JSOp op, jssrcnote* sn);
    ControlStatus tableSwitch(JSOp op, jssrcnote* sn);
    ControlStatus condSwitch(JSOp op, jssrcnote* sn);

    // Please see the Big Honkin' Comment about how resume points work in
    // IonBuilder.cpp, near the definition for this function.
    MOZ_MUST_USE bool resume(MInstruction* ins, jsbytecode* pc, MResumePoint::Mode mode);
    MOZ_MUST_USE bool resumeAt(MInstruction* ins, jsbytecode* pc);
    MOZ_MUST_USE bool resumeAfter(MInstruction* ins);
    MOZ_MUST_USE bool maybeInsertResume();

    void insertRecompileCheck();

    MOZ_MUST_USE bool initParameters();
    void initLocals();
    void rewriteParameter(uint32_t slotIdx, MDefinition* param, int32_t argIndex);
    MOZ_MUST_USE bool rewriteParameters();
    MOZ_MUST_USE bool initEnvironmentChain(MDefinition* callee = nullptr);
    MOZ_MUST_USE bool initArgumentsObject();
    void pushConstant(const Value& v);

    MConstant* constant(const Value& v);
    MConstant* constantInt(int32_t i);
    MInstruction* initializedLength(MDefinition* obj, MDefinition* elements);
    MInstruction* setInitializedLength(MDefinition* obj, size_t count);

    // Improve the type information at tests
    MOZ_MUST_USE bool improveTypesAtTest(MDefinition* ins, bool trueBranch, MTest* test);
    MOZ_MUST_USE bool improveTypesAtCompare(MCompare* ins, bool trueBranch, MTest* test);
    MOZ_MUST_USE bool improveTypesAtNullOrUndefinedCompare(MCompare* ins, bool trueBranch,
                                                           MTest* test);
    MOZ_MUST_USE bool improveTypesAtTypeOfCompare(MCompare* ins, bool trueBranch, MTest* test);

    // Used to detect triangular structure at test.
    MOZ_MUST_USE bool detectAndOrStructure(MPhi* ins, bool* branchIsTrue);
    MOZ_MUST_USE bool replaceTypeSet(MDefinition* subject, TemporaryTypeSet* type, MTest* test);

    // Add a guard which ensure that the set of type which goes through this
    // generated code correspond to the observed types for the bytecode.
    MDefinition* addTypeBarrier(MDefinition* def, TemporaryTypeSet* observed,
                                BarrierKind kind, MTypeBarrier** pbarrier = nullptr);
    MOZ_MUST_USE bool pushTypeBarrier(MDefinition* def, TemporaryTypeSet* observed,
                                      BarrierKind kind);

    // As pushTypeBarrier, but will compute the needBarrier boolean itself based
    // on observed and the JSFunction that we're planning to call. The
    // JSFunction must be a DOM method or getter.
    MOZ_MUST_USE bool pushDOMTypeBarrier(MInstruction* ins, TemporaryTypeSet* observed,
                                         JSFunction* func);

    // If definiteType is not known or def already has the right type, just
    // returns def.  Otherwise, returns an MInstruction that has that definite
    // type, infallibly unboxing ins as needed.  The new instruction will be
    // added to |current| in this case.
    MDefinition* ensureDefiniteType(MDefinition* def, MIRType definiteType);

    // Creates a MDefinition based on the given def improved with type as TypeSet.
    MDefinition* ensureDefiniteTypeSet(MDefinition* def, TemporaryTypeSet* types);

    void maybeMarkEmpty(MDefinition* ins);

    JSObject* getSingletonPrototype(JSFunction* target);

    MDefinition* createThisScripted(MDefinition* callee, MDefinition* newTarget);
    MDefinition* createThisScriptedSingleton(JSFunction* target, MDefinition* callee);
    MDefinition* createThisScriptedBaseline(MDefinition* callee);
    MDefinition* createThis(JSFunction* target, MDefinition* callee, MDefinition* newTarget);
    MInstruction* createNamedLambdaObject(MDefinition* callee, MDefinition* envObj);
    MInstruction* createCallObject(MDefinition* callee, MDefinition* envObj);

    MDefinition* walkEnvironmentChain(unsigned hops);

    MInstruction* addConvertElementsToDoubles(MDefinition* elements);
    MDefinition* addMaybeCopyElementsForWrite(MDefinition* object, bool checkNative);
    MInstruction* addBoundsCheck(MDefinition* index, MDefinition* length);
    MInstruction* addShapeGuard(MDefinition* obj, Shape* const shape, BailoutKind bailoutKind);
    MInstruction* addGroupGuard(MDefinition* obj, ObjectGroup* group, BailoutKind bailoutKind);
    MInstruction* addSharedTypedArrayGuard(MDefinition* obj);

    MInstruction*
    addGuardReceiverPolymorphic(MDefinition* obj, const BaselineInspector::ReceiverVector& receivers);

    MDefinition* convertShiftToMaskForStaticTypedArray(MDefinition* id,
                                                       Scalar::Type viewType);

    bool invalidatedIdempotentCache();

    bool hasStaticEnvironmentObject(EnvironmentCoordinate ec, JSObject** pcall);
    MOZ_MUST_USE bool loadSlot(MDefinition* obj, size_t slot, size_t nfixed, MIRType rvalType,
                               BarrierKind barrier, TemporaryTypeSet* types);
    MOZ_MUST_USE bool loadSlot(MDefinition* obj, Shape* shape, MIRType rvalType,
                               BarrierKind barrier, TemporaryTypeSet* types);
    MOZ_MUST_USE bool storeSlot(MDefinition* obj, size_t slot, size_t nfixed, MDefinition* value,
                                bool needsBarrier, MIRType slotType = MIRType::None);
    MOZ_MUST_USE bool storeSlot(MDefinition* obj, Shape* shape, MDefinition* value,
                                bool needsBarrier, MIRType slotType = MIRType::None);
    bool shouldAbortOnPreliminaryGroups(MDefinition *obj);

    MDefinition* tryInnerizeWindow(MDefinition* obj);
    MDefinition* maybeUnboxForPropertyAccess(MDefinition* def);

    // jsop_getprop() helpers.
    MOZ_MUST_USE bool checkIsDefinitelyOptimizedArguments(MDefinition* obj, bool* isOptimizedArgs);
    MOZ_MUST_USE bool getPropTryInferredConstant(bool* emitted, MDefinition* obj,
                                                 PropertyName* name, TemporaryTypeSet* types);
    MOZ_MUST_USE bool getPropTryArgumentsLength(bool* emitted, MDefinition* obj);
    MOZ_MUST_USE bool getPropTryArgumentsCallee(bool* emitted, MDefinition* obj,
                                                PropertyName* name);
    MOZ_MUST_USE bool getPropTryConstant(bool* emitted, MDefinition* obj, jsid id,
                                         TemporaryTypeSet* types);
    MOZ_MUST_USE bool getPropTryNotDefined(bool* emitted, MDefinition* obj, jsid id,
                                           TemporaryTypeSet* types);
    MOZ_MUST_USE bool getPropTryDefiniteSlot(bool* emitted, MDefinition* obj, PropertyName* name,
                                             BarrierKind barrier, TemporaryTypeSet* types);
    MOZ_MUST_USE bool getPropTryModuleNamespace(bool* emitted, MDefinition* obj, PropertyName* name,
                                                BarrierKind barrier, TemporaryTypeSet* types);
    MOZ_MUST_USE bool getPropTryCommonGetter(bool* emitted, MDefinition* obj, PropertyName* name,
                                             TemporaryTypeSet* types);
    MOZ_MUST_USE bool getPropTryInlineAccess(bool* emitted, MDefinition* obj, PropertyName* name,
                                             BarrierKind barrier, TemporaryTypeSet* types);
    MOZ_MUST_USE bool getPropTryTypedObject(bool* emitted, MDefinition* obj, PropertyName* name);
    MOZ_MUST_USE bool getPropTryScalarPropOfTypedObject(bool* emitted, MDefinition* typedObj,
                                                        int32_t fieldOffset,
                                                        TypedObjectPrediction fieldTypeReprs);
    MOZ_MUST_USE bool getPropTryReferencePropOfTypedObject(bool* emitted, MDefinition* typedObj,
                                                           int32_t fieldOffset,
                                                           TypedObjectPrediction fieldPrediction,
                                                           PropertyName* name);
    MOZ_MUST_USE bool getPropTryComplexPropOfTypedObject(bool* emitted, MDefinition* typedObj,
                                                         int32_t fieldOffset,
                                                         TypedObjectPrediction fieldTypeReprs,
                                                         size_t fieldIndex);
    MOZ_MUST_USE bool getPropTryInnerize(bool* emitted, MDefinition* obj, PropertyName* name,
                                         TemporaryTypeSet* types);
    MOZ_MUST_USE bool getPropTryCache(bool* emitted, MDefinition* obj, PropertyName* name,
                                      BarrierKind barrier, TemporaryTypeSet* types);
    MOZ_MUST_USE bool getPropTrySharedStub(bool* emitted, MDefinition* obj,
                                           TemporaryTypeSet* types);

    // jsop_setprop() helpers.
    MOZ_MUST_USE bool setPropTryCommonSetter(bool* emitted, MDefinition* obj,
                                             PropertyName* name, MDefinition* value);
    MOZ_MUST_USE bool setPropTryCommonDOMSetter(bool* emitted, MDefinition* obj,
                                                MDefinition* value, JSFunction* setter,
                                                TemporaryTypeSet* objTypes);
    MOZ_MUST_USE bool setPropTryDefiniteSlot(bool* emitted, MDefinition* obj,
                                             PropertyName* name, MDefinition* value,
                                             bool barrier, TemporaryTypeSet* objTypes);
    MOZ_MUST_USE bool setPropTryInlineAccess(bool* emitted, MDefinition* obj,
                                             PropertyName* name, MDefinition* value,
                                             bool barrier, TemporaryTypeSet* objTypes);
    MOZ_MUST_USE bool setPropTryTypedObject(bool* emitted, MDefinition* obj,
                                            PropertyName* name, MDefinition* value);
    MOZ_MUST_USE bool setPropTryReferencePropOfTypedObject(bool* emitted, MDefinition* obj,
                                                           int32_t fieldOffset, MDefinition* value,
                                                           TypedObjectPrediction fieldPrediction,
                                                           PropertyName* name);
    MOZ_MUST_USE bool setPropTryScalarPropOfTypedObject(bool* emitted,
                                                        MDefinition* obj,
                                                        int32_t fieldOffset,
                                                        MDefinition* value,
                                                        TypedObjectPrediction fieldTypeReprs);
    MOZ_MUST_USE bool setPropTryCache(bool* emitted, MDefinition* obj,
                                      PropertyName* name, MDefinition* value,
                                      bool barrier, TemporaryTypeSet* objTypes);

    // jsop_binary_arith helpers.
    MBinaryArithInstruction* binaryArithInstruction(JSOp op, MDefinition* left, MDefinition* right);
    MOZ_MUST_USE bool binaryArithTryConcat(bool* emitted, JSOp op, MDefinition* left,
                                           MDefinition* right);
    MOZ_MUST_USE bool binaryArithTrySpecialized(bool* emitted, JSOp op, MDefinition* left,
                                                MDefinition* right);
    MOZ_MUST_USE bool binaryArithTrySpecializedOnBaselineInspector(bool* emitted, JSOp op,
                                                                   MDefinition* left,
                                                                   MDefinition* right);
    MOZ_MUST_USE bool arithTrySharedStub(bool* emitted, JSOp op, MDefinition* left,
                                         MDefinition* right);

    // jsop_bitnot helpers.
    MOZ_MUST_USE bool bitnotTrySpecialized(bool* emitted, MDefinition* input);

    // jsop_pow helpers.
    MOZ_MUST_USE bool powTrySpecialized(bool* emitted, MDefinition* base, MDefinition* power,
                                        MIRType outputType);

    // jsop_compare helpers.
    MOZ_MUST_USE bool compareTrySpecialized(bool* emitted, JSOp op, MDefinition* left,
                                            MDefinition* right);
    MOZ_MUST_USE bool compareTryBitwise(bool* emitted, JSOp op, MDefinition* left,
                                        MDefinition* right);
    MOZ_MUST_USE bool compareTrySpecializedOnBaselineInspector(bool* emitted, JSOp op,
                                                               MDefinition* left,
                                                               MDefinition* right);
    MOZ_MUST_USE bool compareTrySharedStub(bool* emitted, JSOp op, MDefinition* left,
                                           MDefinition* right);

    // jsop_newarray helpers.
    MOZ_MUST_USE bool newArrayTrySharedStub(bool* emitted);
    MOZ_MUST_USE bool newArrayTryTemplateObject(bool* emitted, JSObject* templateObject,
                                                uint32_t length);
    MOZ_MUST_USE bool newArrayTryVM(bool* emitted, JSObject* templateObject, uint32_t length);

    // jsop_newobject helpers.
    MOZ_MUST_USE bool newObjectTrySharedStub(bool* emitted);
    MOZ_MUST_USE bool newObjectTryTemplateObject(bool* emitted, JSObject* templateObject);
    MOZ_MUST_USE bool newObjectTryVM(bool* emitted, JSObject* templateObject);

    // jsop_in helpers.
    MOZ_MUST_USE bool inTryDense(bool* emitted, MDefinition* obj, MDefinition* id);
    MOZ_MUST_USE bool inTryFold(bool* emitted, MDefinition* obj, MDefinition* id);

    // binary data lookup helpers.
    TypedObjectPrediction typedObjectPrediction(MDefinition* typedObj);
    TypedObjectPrediction typedObjectPrediction(TemporaryTypeSet* types);
    MOZ_MUST_USE bool typedObjectHasField(MDefinition* typedObj,
                                          PropertyName* name,
                                          size_t* fieldOffset,
                                          TypedObjectPrediction* fieldTypeReprs,
                                          size_t* fieldIndex);
    MDefinition* loadTypedObjectType(MDefinition* value);
    void loadTypedObjectData(MDefinition* typedObj,
                             MDefinition** owner,
                             LinearSum* ownerOffset);
    void loadTypedObjectElements(MDefinition* typedObj,
                                 const LinearSum& byteOffset,
                                 uint32_t scale,
                                 MDefinition** ownerElements,
                                 MDefinition** ownerScaledOffset,
                                 int32_t* ownerByteAdjustment);
    MDefinition* typeObjectForElementFromArrayStructType(MDefinition* typedObj);
    MDefinition* typeObjectForFieldFromStructType(MDefinition* type,
                                                  size_t fieldIndex);
    MOZ_MUST_USE bool storeReferenceTypedObjectValue(MDefinition* typedObj,
                                                     const LinearSum& byteOffset,
                                                     ReferenceTypeDescr::Type type,
                                                     MDefinition* value,
                                                     PropertyName* name);
    MOZ_MUST_USE bool storeScalarTypedObjectValue(MDefinition* typedObj,
                                                  const LinearSum& byteOffset,
                                                  ScalarTypeDescr::Type type,
                                                  MDefinition* value);
    MOZ_MUST_USE bool checkTypedObjectIndexInBounds(uint32_t elemSize,
                                                    MDefinition* obj,
                                                    MDefinition* index,
                                                    TypedObjectPrediction objTypeDescrs,
                                                    LinearSum* indexAsByteOffset);
    MOZ_MUST_USE bool pushDerivedTypedObject(bool* emitted,
                                             MDefinition* obj,
                                             const LinearSum& byteOffset,
                                             TypedObjectPrediction derivedTypeDescrs,
                                             MDefinition* derivedTypeObj);
    MOZ_MUST_USE bool pushScalarLoadFromTypedObject(MDefinition* obj,
                                                    const LinearSum& byteoffset,
                                                    ScalarTypeDescr::Type type);
    MOZ_MUST_USE bool pushReferenceLoadFromTypedObject(MDefinition* typedObj,
                                                       const LinearSum& byteOffset,
                                                       ReferenceTypeDescr::Type type,
                                                       PropertyName* name);
    JSObject* getStaticTypedArrayObject(MDefinition* obj, MDefinition* index);

    // jsop_setelem() helpers.
    MOZ_MUST_USE bool setElemTryTypedArray(bool* emitted, MDefinition* object,
                                           MDefinition* index, MDefinition* value);
    MOZ_MUST_USE bool setElemTryTypedObject(bool* emitted, MDefinition* obj,
                                            MDefinition* index, MDefinition* value);
    MOZ_MUST_USE bool setElemTryTypedStatic(bool* emitted, MDefinition* object,
                                            MDefinition* index, MDefinition* value);
    MOZ_MUST_USE bool setElemTryDense(bool* emitted, MDefinition* object,
                                      MDefinition* index, MDefinition* value, bool writeHole);
    MOZ_MUST_USE bool setElemTryArguments(bool* emitted, MDefinition* object,
                                          MDefinition* index, MDefinition* value);
    MOZ_MUST_USE bool setElemTryCache(bool* emitted, MDefinition* object,
                                      MDefinition* index, MDefinition* value);
    MOZ_MUST_USE bool setElemTryReferenceElemOfTypedObject(bool* emitted,
                                                           MDefinition* obj,
                                                           MDefinition* index,
                                                           TypedObjectPrediction objPrediction,
                                                           MDefinition* value,
                                                           TypedObjectPrediction elemPrediction);
    MOZ_MUST_USE bool setElemTryScalarElemOfTypedObject(bool* emitted,
                                                        MDefinition* obj,
                                                        MDefinition* index,
                                                        TypedObjectPrediction objTypeReprs,
                                                        MDefinition* value,
                                                        TypedObjectPrediction elemTypeReprs,
                                                        uint32_t elemSize);
    MOZ_MUST_USE bool initializeArrayElement(MDefinition* obj, size_t index, MDefinition* value,
                                             bool addResumePointAndIncrementInitializedLength);

    // jsop_getelem() helpers.
    MOZ_MUST_USE bool getElemTryDense(bool* emitted, MDefinition* obj, MDefinition* index);
    MOZ_MUST_USE bool getElemTryGetProp(bool* emitted, MDefinition* obj, MDefinition* index);
    MOZ_MUST_USE bool getElemTryTypedStatic(bool* emitted, MDefinition* obj, MDefinition* index);
    MOZ_MUST_USE bool getElemTryTypedArray(bool* emitted, MDefinition* obj, MDefinition* index);
    MOZ_MUST_USE bool getElemTryTypedObject(bool* emitted, MDefinition* obj, MDefinition* index);
    MOZ_MUST_USE bool getElemTryString(bool* emitted, MDefinition* obj, MDefinition* index);
    MOZ_MUST_USE bool getElemTryArguments(bool* emitted, MDefinition* obj, MDefinition* index);
    MOZ_MUST_USE bool getElemTryArgumentsInlined(bool* emitted, MDefinition* obj,
                                                 MDefinition* index);
    MOZ_MUST_USE bool getElemTryCache(bool* emitted, MDefinition* obj, MDefinition* index);
    MOZ_MUST_USE bool getElemTryScalarElemOfTypedObject(bool* emitted,
                                                        MDefinition* obj,
                                                        MDefinition* index,
                                                        TypedObjectPrediction objTypeReprs,
                                                        TypedObjectPrediction elemTypeReprs,
                                                        uint32_t elemSize);
    MOZ_MUST_USE bool getElemTryReferenceElemOfTypedObject(bool* emitted,
                                                           MDefinition* obj,
                                                           MDefinition* index,
                                                           TypedObjectPrediction objPrediction,
                                                           TypedObjectPrediction elemPrediction);
    MOZ_MUST_USE bool getElemTryComplexElemOfTypedObject(bool* emitted,
                                                         MDefinition* obj,
                                                         MDefinition* index,
                                                         TypedObjectPrediction objTypeReprs,
                                                         TypedObjectPrediction elemTypeReprs,
                                                         uint32_t elemSize);
    TemporaryTypeSet* computeHeapType(const TemporaryTypeSet* objTypes, const jsid id);

    enum BoundsChecking { DoBoundsCheck, SkipBoundsCheck };

    MInstruction* addArrayBufferByteLength(MDefinition* obj);

    // Add instructions to compute a typed array's length and data.  Also
    // optionally convert |*index| into a bounds-checked definition, if
    // requested.
    //
    // If you only need the array's length, use addTypedArrayLength below.
    void addTypedArrayLengthAndData(MDefinition* obj,
                                    BoundsChecking checking,
                                    MDefinition** index,
                                    MInstruction** length, MInstruction** elements);

    // Add an instruction to compute a typed array's length to the current
    // block.  If you also need the typed array's data, use the above method
    // instead.
    MInstruction* addTypedArrayLength(MDefinition* obj) {
        MInstruction* length;
        addTypedArrayLengthAndData(obj, SkipBoundsCheck, nullptr, &length, nullptr);
        return length;
    }

    MOZ_MUST_USE bool improveThisTypesForCall();

    MDefinition* getCallee();
    MDefinition* getAliasedVar(EnvironmentCoordinate ec);
    MDefinition* addLexicalCheck(MDefinition* input);

    MDefinition* convertToBoolean(MDefinition* input);

    MOZ_MUST_USE bool tryFoldInstanceOf(MDefinition* lhs, JSObject* protoObject);
    MOZ_MUST_USE bool hasOnProtoChain(TypeSet::ObjectKey* key, JSObject* protoObject,
                                      bool* hasOnProto);

    MOZ_MUST_USE bool jsop_add(MDefinition* left, MDefinition* right);
    MOZ_MUST_USE bool jsop_bitnot();
    MOZ_MUST_USE bool jsop_bitop(JSOp op);
    MOZ_MUST_USE bool jsop_binary_arith(JSOp op);
    MOZ_MUST_USE bool jsop_binary_arith(JSOp op, MDefinition* left, MDefinition* right);
    MOZ_MUST_USE bool jsop_pow();
    MOZ_MUST_USE bool jsop_pos();
    MOZ_MUST_USE bool jsop_neg();
    MOZ_MUST_USE bool jsop_tostring();
    MOZ_MUST_USE bool jsop_setarg(uint32_t arg);
    MOZ_MUST_USE bool jsop_defvar(uint32_t index);
    MOZ_MUST_USE bool jsop_deflexical(uint32_t index);
    MOZ_MUST_USE bool jsop_deffun(uint32_t index);
    MOZ_MUST_USE bool jsop_notearg();
    MOZ_MUST_USE bool jsop_throwsetconst();
    MOZ_MUST_USE bool jsop_checklexical();
    MOZ_MUST_USE bool jsop_checkaliasedlexical(EnvironmentCoordinate ec);
    MOZ_MUST_USE bool jsop_funcall(uint32_t argc);
    MOZ_MUST_USE bool jsop_funapply(uint32_t argc);
    MOZ_MUST_USE bool jsop_funapplyarguments(uint32_t argc);
    MOZ_MUST_USE bool jsop_funapplyarray(uint32_t argc);
    MOZ_MUST_USE bool jsop_call(uint32_t argc, bool constructing);
    MOZ_MUST_USE bool jsop_call(uint32_t argc, bool constructing, bool ignoresReturnValue);
    MOZ_MUST_USE bool jsop_eval(uint32_t argc);
    MOZ_MUST_USE bool jsop_ifeq(JSOp op);
    MOZ_MUST_USE bool jsop_try();
    MOZ_MUST_USE bool jsop_label();
    MOZ_MUST_USE bool jsop_condswitch();
    MOZ_MUST_USE bool jsop_andor(JSOp op);
    MOZ_MUST_USE bool jsop_dup2();
    MOZ_MUST_USE bool jsop_loophead(jsbytecode* pc);
    MOZ_MUST_USE bool jsop_compare(JSOp op);
    MOZ_MUST_USE bool jsop_compare(JSOp op, MDefinition* left, MDefinition* right);
    MOZ_MUST_USE bool getStaticName(JSObject* staticObject, PropertyName* name, bool* psucceeded,
                                    MDefinition* lexicalCheck = nullptr);
    MOZ_MUST_USE bool loadStaticSlot(JSObject* staticObject, BarrierKind barrier,
                                     TemporaryTypeSet* types, uint32_t slot);
    MOZ_MUST_USE bool setStaticName(JSObject* staticObject, PropertyName* name);
    MOZ_MUST_USE bool jsop_getgname(PropertyName* name);
    MOZ_MUST_USE bool jsop_getname(PropertyName* name);
    MOZ_MUST_USE bool jsop_intrinsic(PropertyName* name);
    MOZ_MUST_USE bool jsop_getimport(PropertyName* name);
    MOZ_MUST_USE bool jsop_bindname(PropertyName* name);
    MOZ_MUST_USE bool jsop_bindvar();
    MOZ_MUST_USE bool jsop_getelem();
    MOZ_MUST_USE bool jsop_getelem_dense(MDefinition* obj, MDefinition* index);
    MOZ_MUST_USE bool jsop_getelem_typed(MDefinition* obj, MDefinition* index,
                                         ScalarTypeDescr::Type arrayType);
    MOZ_MUST_USE bool jsop_setelem();
    MOZ_MUST_USE bool jsop_setelem_dense(TemporaryTypeSet::DoubleConversion conversion,
                                         MDefinition* object, MDefinition* index,
                                         MDefinition* value, bool writeHole, bool* emitted);
    MOZ_MUST_USE bool jsop_setelem_typed(ScalarTypeDescr::Type arrayType,
                                         MDefinition* object, MDefinition* index,
                                         MDefinition* value);
    MOZ_MUST_USE bool jsop_length();
    MOZ_MUST_USE bool jsop_length_fastPath();
    MOZ_MUST_USE bool jsop_arguments();
    MOZ_MUST_USE bool jsop_arguments_getelem();
    MOZ_MUST_USE bool jsop_runonce();
    MOZ_MUST_USE bool jsop_rest();
    MOZ_MUST_USE bool jsop_not();
    MOZ_MUST_USE bool jsop_getprop(PropertyName* name);
    MOZ_MUST_USE bool jsop_setprop(PropertyName* name);
    MOZ_MUST_USE bool jsop_delprop(PropertyName* name);
    MOZ_MUST_USE bool jsop_delelem();
    MOZ_MUST_USE bool jsop_newarray(uint32_t length);
    MOZ_MUST_USE bool jsop_newarray(JSObject* templateObject, uint32_t length);
    MOZ_MUST_USE bool jsop_newarray_copyonwrite();
    MOZ_MUST_USE bool jsop_newobject();
    MOZ_MUST_USE bool jsop_initelem();
    MOZ_MUST_USE bool jsop_initelem_array();
    MOZ_MUST_USE bool jsop_initelem_getter_setter();
    MOZ_MUST_USE bool jsop_mutateproto();
    MOZ_MUST_USE bool jsop_initprop(PropertyName* name);
    MOZ_MUST_USE bool jsop_initprop_getter_setter(PropertyName* name);
    MOZ_MUST_USE bool jsop_regexp(RegExpObject* reobj);
    MOZ_MUST_USE bool jsop_object(JSObject* obj);
    MOZ_MUST_USE bool jsop_lambda(JSFunction* fun);
    MOZ_MUST_USE bool jsop_lambda_arrow(JSFunction* fun);
    MOZ_MUST_USE bool jsop_setfunname(uint8_t prefixKind);
    MOZ_MUST_USE bool jsop_functionthis();
    MOZ_MUST_USE bool jsop_globalthis();
    MOZ_MUST_USE bool jsop_typeof();
    MOZ_MUST_USE bool jsop_toasync();
    MOZ_MUST_USE bool jsop_toid();
    MOZ_MUST_USE bool jsop_iter(uint8_t flags);
    MOZ_MUST_USE bool jsop_itermore();
    MOZ_MUST_USE bool jsop_isnoiter();
    MOZ_MUST_USE bool jsop_iterend();
    MOZ_MUST_USE bool jsop_in();
    MOZ_MUST_USE bool jsop_instanceof();
    MOZ_MUST_USE bool jsop_getaliasedvar(EnvironmentCoordinate ec);
    MOZ_MUST_USE bool jsop_setaliasedvar(EnvironmentCoordinate ec);
    MOZ_MUST_USE bool jsop_debugger();
    MOZ_MUST_USE bool jsop_newtarget();
    MOZ_MUST_USE bool jsop_checkisobj(uint8_t kind);
    MOZ_MUST_USE bool jsop_checkiscallable(uint8_t kind);
    MOZ_MUST_USE bool jsop_checkobjcoercible();
    MOZ_MUST_USE bool jsop_pushcallobj();

    /* Inlining. */

    enum InliningStatus
    {
        InliningStatus_Error,
        InliningStatus_NotInlined,
        InliningStatus_WarmUpCountTooLow,
        InliningStatus_Inlined
    };

    enum InliningDecision
    {
        InliningDecision_Error,
        InliningDecision_Inline,
        InliningDecision_DontInline,
        InliningDecision_WarmUpCountTooLow
    };

    static InliningDecision DontInline(JSScript* targetScript, const char* reason);

    // Helper function for canInlineTarget
    bool hasCommonInliningPath(const JSScript* scriptToInline);

    // Oracles.
    InliningDecision canInlineTarget(JSFunction* target, CallInfo& callInfo);
    InliningDecision makeInliningDecision(JSObject* target, CallInfo& callInfo);
    MOZ_MUST_USE bool selectInliningTargets(const ObjectVector& targets, CallInfo& callInfo,
                                            BoolVector& choiceSet, uint32_t* numInlineable);

    // Native inlining helpers.
    // The typeset for the return value of our function.  These are
    // the types it's been observed returning in the past.
    TemporaryTypeSet* getInlineReturnTypeSet();
    // The known MIR type of getInlineReturnTypeSet.
    MIRType getInlineReturnType();

    // Array natives.
    InliningStatus inlineArray(CallInfo& callInfo);
    InliningStatus inlineArrayIsArray(CallInfo& callInfo);
    InliningStatus inlineArrayPopShift(CallInfo& callInfo, MArrayPopShift::Mode mode);
    InliningStatus inlineArrayPush(CallInfo& callInfo);
    InliningStatus inlineArraySlice(CallInfo& callInfo);
    InliningStatus inlineArrayJoin(CallInfo& callInfo);

    // Math natives.
    InliningStatus inlineMathAbs(CallInfo& callInfo);
    InliningStatus inlineMathFloor(CallInfo& callInfo);
    InliningStatus inlineMathCeil(CallInfo& callInfo);
    InliningStatus inlineMathClz32(CallInfo& callInfo);
    InliningStatus inlineMathRound(CallInfo& callInfo);
    InliningStatus inlineMathSqrt(CallInfo& callInfo);
    InliningStatus inlineMathAtan2(CallInfo& callInfo);
    InliningStatus inlineMathHypot(CallInfo& callInfo);
    InliningStatus inlineMathMinMax(CallInfo& callInfo, bool max);
    InliningStatus inlineMathPow(CallInfo& callInfo);
    InliningStatus inlineMathRandom(CallInfo& callInfo);
    InliningStatus inlineMathImul(CallInfo& callInfo);
    InliningStatus inlineMathFRound(CallInfo& callInfo);
    InliningStatus inlineMathFunction(CallInfo& callInfo, MMathFunction::Function function);

    // String natives.
    InliningStatus inlineStringObject(CallInfo& callInfo);
    InliningStatus inlineStrCharCodeAt(CallInfo& callInfo);
    InliningStatus inlineConstantCharCodeAt(CallInfo& callInfo);
    InliningStatus inlineStrFromCharCode(CallInfo& callInfo);
    InliningStatus inlineStrFromCodePoint(CallInfo& callInfo);
    InliningStatus inlineStrCharAt(CallInfo& callInfo);

    // String intrinsics.
    InliningStatus inlineStringReplaceString(CallInfo& callInfo);
    InliningStatus inlineConstantStringSplitString(CallInfo& callInfo);
    InliningStatus inlineStringSplitString(CallInfo& callInfo);

    // RegExp intrinsics.
    InliningStatus inlineRegExpMatcher(CallInfo& callInfo);
    InliningStatus inlineRegExpSearcher(CallInfo& callInfo);
    InliningStatus inlineRegExpTester(CallInfo& callInfo);
    InliningStatus inlineIsRegExpObject(CallInfo& callInfo);
    InliningStatus inlineRegExpPrototypeOptimizable(CallInfo& callInfo);
    InliningStatus inlineRegExpInstanceOptimizable(CallInfo& callInfo);
    InliningStatus inlineGetFirstDollarIndex(CallInfo& callInfo);

    // Object natives and intrinsics.
    InliningStatus inlineObjectCreate(CallInfo& callInfo);
    InliningStatus inlineDefineDataProperty(CallInfo& callInfo);

    // Atomics natives.
    InliningStatus inlineAtomicsCompareExchange(CallInfo& callInfo);
    InliningStatus inlineAtomicsExchange(CallInfo& callInfo);
    InliningStatus inlineAtomicsLoad(CallInfo& callInfo);
    InliningStatus inlineAtomicsStore(CallInfo& callInfo);
    InliningStatus inlineAtomicsBinop(CallInfo& callInfo, InlinableNative target);
    InliningStatus inlineAtomicsIsLockFree(CallInfo& callInfo);

    // Slot intrinsics.
    InliningStatus inlineUnsafeSetReservedSlot(CallInfo& callInfo);
    InliningStatus inlineUnsafeGetReservedSlot(CallInfo& callInfo,
                                               MIRType knownValueType);

    // Map and Set intrinsics.
    InliningStatus inlineGetNextEntryForIterator(CallInfo& callInfo,
                                                 MGetNextEntryForIterator::Mode mode);

    // ArrayBuffer intrinsics.
    InliningStatus inlineArrayBufferByteLength(CallInfo& callInfo);
    InliningStatus inlinePossiblyWrappedArrayBufferByteLength(CallInfo& callInfo);

    // TypedArray intrinsics.
    enum WrappingBehavior { AllowWrappedTypedArrays, RejectWrappedTypedArrays };
    InliningStatus inlineTypedArray(CallInfo& callInfo, Native native);
    InliningStatus inlineIsTypedArrayHelper(CallInfo& callInfo, WrappingBehavior wrappingBehavior);
    InliningStatus inlineIsTypedArray(CallInfo& callInfo);
    InliningStatus inlineIsPossiblyWrappedTypedArray(CallInfo& callInfo);
    InliningStatus inlineTypedArrayLength(CallInfo& callInfo);
    InliningStatus inlinePossiblyWrappedTypedArrayLength(CallInfo& callInfo);
    InliningStatus inlineSetDisjointTypedElements(CallInfo& callInfo);

    // TypedObject intrinsics and natives.
    InliningStatus inlineObjectIsTypeDescr(CallInfo& callInfo);
    InliningStatus inlineSetTypedObjectOffset(CallInfo& callInfo);
    InliningStatus inlineConstructTypedObject(CallInfo& callInfo, TypeDescr* target);

    // SIMD intrinsics and natives.
    InliningStatus inlineConstructSimdObject(CallInfo& callInfo, SimdTypeDescr* target);

    // SIMD helpers.
    bool canInlineSimd(CallInfo& callInfo, JSNative native, unsigned numArgs,
                       InlineTypedObject** templateObj);
    MDefinition* unboxSimd(MDefinition* ins, SimdType type);
    IonBuilder::InliningStatus boxSimd(CallInfo& callInfo, MDefinition* ins,
                                       InlineTypedObject* templateObj);
    MDefinition* convertToBooleanSimdLane(MDefinition* scalar);

    InliningStatus inlineSimd(CallInfo& callInfo, JSFunction* target, SimdType type);

    InliningStatus inlineSimdBinaryArith(CallInfo& callInfo, JSNative native,
                                         MSimdBinaryArith::Operation op, SimdType type);
    InliningStatus inlineSimdBinaryBitwise(CallInfo& callInfo, JSNative native,
                                           MSimdBinaryBitwise::Operation op, SimdType type);
    InliningStatus inlineSimdBinarySaturating(CallInfo& callInfo, JSNative native,
                                              MSimdBinarySaturating::Operation op, SimdType type);
    InliningStatus inlineSimdShift(CallInfo& callInfo, JSNative native, MSimdShift::Operation op,
                                   SimdType type);
    InliningStatus inlineSimdComp(CallInfo& callInfo, JSNative native,
                                  MSimdBinaryComp::Operation op, SimdType type);
    InliningStatus inlineSimdUnary(CallInfo& callInfo, JSNative native,
                                   MSimdUnaryArith::Operation op, SimdType type);
    InliningStatus inlineSimdExtractLane(CallInfo& callInfo, JSNative native, SimdType type);
    InliningStatus inlineSimdReplaceLane(CallInfo& callInfo, JSNative native, SimdType type);
    InliningStatus inlineSimdSplat(CallInfo& callInfo, JSNative native, SimdType type);
    InliningStatus inlineSimdShuffle(CallInfo& callInfo, JSNative native, SimdType type,
                                     unsigned numVectors);
    InliningStatus inlineSimdCheck(CallInfo& callInfo, JSNative native, SimdType type);
    InliningStatus inlineSimdConvert(CallInfo& callInfo, JSNative native, bool isCast,
                                     SimdType from, SimdType to);
    InliningStatus inlineSimdSelect(CallInfo& callInfo, JSNative native, SimdType type);

    MOZ_MUST_USE bool prepareForSimdLoadStore(CallInfo& callInfo, Scalar::Type simdType,
                                              MInstruction** elements, MDefinition** index,
                                              Scalar::Type* arrayType);
    InliningStatus inlineSimdLoad(CallInfo& callInfo, JSNative native, SimdType type,
                                  unsigned numElems);
    InliningStatus inlineSimdStore(CallInfo& callInfo, JSNative native, SimdType type,
                                   unsigned numElems);

    InliningStatus inlineSimdAnyAllTrue(CallInfo& callInfo, bool IsAllTrue, JSNative native,
                                        SimdType type);

    // Utility intrinsics.
    InliningStatus inlineIsCallable(CallInfo& callInfo);
    InliningStatus inlineIsConstructor(CallInfo& callInfo);
    InliningStatus inlineIsObject(CallInfo& callInfo);
    InliningStatus inlineToObject(CallInfo& callInfo);
    InliningStatus inlineIsWrappedArrayConstructor(CallInfo& callInfo);
    InliningStatus inlineToInteger(CallInfo& callInfo);
    InliningStatus inlineToString(CallInfo& callInfo);
    InliningStatus inlineDump(CallInfo& callInfo);
    InliningStatus inlineHasClass(CallInfo& callInfo, const Class* clasp,
                                  const Class* clasp2 = nullptr,
                                  const Class* clasp3 = nullptr,
                                  const Class* clasp4 = nullptr);
    InliningStatus inlineGuardToClass(CallInfo& callInfo, const Class* clasp);
    InliningStatus inlineIsConstructing(CallInfo& callInfo);
    InliningStatus inlineSubstringKernel(CallInfo& callInfo);
    InliningStatus inlineObjectHasPrototype(CallInfo& callInfo);

    // Testing functions.
    InliningStatus inlineBailout(CallInfo& callInfo);
    InliningStatus inlineAssertFloat32(CallInfo& callInfo);
    InliningStatus inlineAssertRecoveredOnBailout(CallInfo& callInfo);

    // Bind function.
    InliningStatus inlineBoundFunction(CallInfo& callInfo, JSFunction* target);

    // Main inlining functions
    InliningStatus inlineNativeCall(CallInfo& callInfo, JSFunction* target);
    InliningStatus inlineNativeGetter(CallInfo& callInfo, JSFunction* target);
    InliningStatus inlineNonFunctionCall(CallInfo& callInfo, JSObject* target);
    InliningStatus inlineScriptedCall(CallInfo& callInfo, JSFunction* target);
    InliningStatus inlineSingleCall(CallInfo& callInfo, JSObject* target);

    // Call functions
    InliningStatus inlineCallsite(const ObjectVector& targets, CallInfo& callInfo);
    MOZ_MUST_USE bool inlineCalls(CallInfo& callInfo, const ObjectVector& targets,
                                  BoolVector& choiceSet, MGetPropertyCache* maybeCache);

    // Inlining helpers.
    MOZ_MUST_USE bool inlineGenericFallback(JSFunction* target, CallInfo& callInfo,
                                            MBasicBlock* dispatchBlock);
    MOZ_MUST_USE bool inlineObjectGroupFallback(CallInfo& callInfo, MBasicBlock* dispatchBlock,
                                                MObjectGroupDispatch* dispatch,
                                                MGetPropertyCache* cache,
                                                MBasicBlock** fallbackTarget);

    enum AtomicCheckResult {
        DontCheckAtomicResult,
        DoCheckAtomicResult
    };

    MOZ_MUST_USE bool atomicsMeetsPreconditions(CallInfo& callInfo, Scalar::Type* arrayElementType,
                                                bool* requiresDynamicCheck,
                                                AtomicCheckResult checkResult=DoCheckAtomicResult);
    void atomicsCheckBounds(CallInfo& callInfo, MInstruction** elements, MDefinition** index);

    MOZ_MUST_USE bool testNeedsArgumentCheck(JSFunction* target, CallInfo& callInfo);

    MCall* makeCallHelper(JSFunction* target, CallInfo& callInfo);
    MOZ_MUST_USE bool makeCall(JSFunction* target, CallInfo& callInfo);

    MDefinition* patchInlinedReturn(CallInfo& callInfo, MBasicBlock* exit, MBasicBlock* bottom);
    MDefinition* patchInlinedReturns(CallInfo& callInfo, MIRGraphReturns& returns,
                                     MBasicBlock* bottom);
    MDefinition* specializeInlinedReturn(MDefinition* rdef, MBasicBlock* exit);

    MOZ_MUST_USE bool objectsHaveCommonPrototype(TemporaryTypeSet* types, PropertyName* name,
                                                 bool isGetter, JSObject* foundProto,
                                                 bool* guardGlobal);
    void freezePropertiesForCommonPrototype(TemporaryTypeSet* types, PropertyName* name,
                                            JSObject* foundProto, bool allowEmptyTypesForGlobal = false);
    /*
     * Callers must pass a non-null globalGuard if they pass a non-null globalShape.
     */
    MOZ_MUST_USE bool testCommonGetterSetter(TemporaryTypeSet* types, PropertyName* name,
                                             bool isGetter, JSObject* foundProto,
                                             Shape* lastProperty, JSFunction* getterOrSetter,
                                             MDefinition** guard, Shape* globalShape = nullptr,
                                             MDefinition** globalGuard = nullptr);
    MOZ_MUST_USE bool testShouldDOMCall(TypeSet* inTypes,
                                        JSFunction* func, JSJitInfo::OpType opType);

    MDefinition*
    addShapeGuardsForGetterSetter(MDefinition* obj, JSObject* holder, Shape* holderShape,
                                  const BaselineInspector::ReceiverVector& receivers,
                                  bool isOwnProperty);

    MOZ_MUST_USE bool annotateGetPropertyCache(MDefinition* obj, PropertyName* name,
                                               MGetPropertyCache* getPropCache,
                                               TemporaryTypeSet* objTypes,
                                               TemporaryTypeSet* pushedTypes);

    MGetPropertyCache* getInlineableGetPropertyCache(CallInfo& callInfo);

    JSObject* testGlobalLexicalBinding(PropertyName* name);

    JSObject* testSingletonProperty(JSObject* obj, jsid id);
    JSObject* testSingletonPropertyTypes(MDefinition* obj, jsid id);

    ResultWithOOM<bool> testNotDefinedProperty(MDefinition* obj, jsid id);

    uint32_t getDefiniteSlot(TemporaryTypeSet* types, PropertyName* name, uint32_t* pnfixed);
    MOZ_MUST_USE bool checkPreliminaryGroups(MDefinition *obj);
    MOZ_MUST_USE bool freezePropTypeSets(TemporaryTypeSet* types,
                                         JSObject* foundProto, PropertyName* name);
    bool canInlinePropertyOpShapes(const BaselineInspector::ReceiverVector& receivers);

    TemporaryTypeSet* bytecodeTypes(jsbytecode* pc);

    // Use one of the below methods for updating the current block, rather than
    // updating |current| directly. setCurrent() should only be used in cases
    // where the block cannot have phis whose type needs to be computed.

    MOZ_MUST_USE bool setCurrentAndSpecializePhis(MBasicBlock* block) {
        if (block) {
            if (!block->specializePhis(alloc()))
                return false;
        }
        setCurrent(block);
        return true;
    }

    void setCurrent(MBasicBlock* block) {
        current = block;
    }

    // A builder is inextricably tied to a particular script.
    JSScript* script_;

    // script->hasIonScript() at the start of the compilation. Used to avoid
    // calling hasIonScript() from background compilation threads.
    bool scriptHasIonScript_;

    // If off thread compilation is successful, the final code generator is
    // attached here. Code has been generated, but not linked (there is not yet
    // an IonScript). This is heap allocated, and must be explicitly destroyed,
    // performed by FinishOffThreadBuilder().
    CodeGenerator* backgroundCodegen_;

    // Some aborts are actionable (e.g., using an unsupported bytecode). When
    // optimization tracking is enabled, the location and message of the abort
    // are recorded here so they may be propagated to the script's
    // corresponding JitcodeGlobalEntry::BaselineEntry.
    JSScript* actionableAbortScript_;
    jsbytecode* actionableAbortPc_;
    const char* actionableAbortMessage_;

    MRootList* rootList_;

  public:
    void setRootList(MRootList& rootList) {
        MOZ_ASSERT(!rootList_);
        rootList_ = &rootList;
    }
    void clearForBackEnd();
    JSObject* checkNurseryObject(JSObject* obj);

    JSScript* script() const { return script_; }
    bool scriptHasIonScript() const { return scriptHasIonScript_; }

    CodeGenerator* backgroundCodegen() const { return backgroundCodegen_; }
    void setBackgroundCodegen(CodeGenerator* codegen) { backgroundCodegen_ = codegen; }

    CompilerConstraintList* constraints() {
        return constraints_;
    }

    bool isInlineBuilder() const {
        return callerBuilder_ != nullptr;
    }

    const JSAtomState& names() { return compartment->runtime()->names(); }

    bool hadActionableAbort() const {
        MOZ_ASSERT(!actionableAbortScript_ ||
                   (actionableAbortPc_ && actionableAbortMessage_));
        return actionableAbortScript_ != nullptr;
    }

    TraceLoggerThread *traceLogger() {
        // Currently ionbuilder only runs on the main thread.
        return TraceLoggerForMainThread(compartment->runtime()->mainThread()->runtimeFromMainThread());
    }

    void actionableAbortLocationAndMessage(JSScript** abortScript, jsbytecode** abortPc,
                                           const char** abortMessage)
    {
        MOZ_ASSERT(hadActionableAbort());
        *abortScript = actionableAbortScript_;
        *abortPc = actionableAbortPc_;
        *abortMessage = actionableAbortMessage_;
    }

    void trace(JSTracer* trc);

  private:
    MOZ_MUST_USE bool init();

    JSContext* analysisContext;
    BaselineFrameInspector* baselineFrame_;

    // Constraints for recording dependencies on type information.
    CompilerConstraintList* constraints_;

    // Basic analysis information about the script.
    BytecodeAnalysis analysis_;
    BytecodeAnalysis& analysis() {
        return analysis_;
    }

    TemporaryTypeSet* thisTypes;
    TemporaryTypeSet* argTypes;
    TemporaryTypeSet* typeArray;
    uint32_t typeArrayHint;
    uint32_t* bytecodeTypeMap;

    GSNCache gsn;
    EnvironmentCoordinateNameCache envCoordinateNameCache;

    jsbytecode* pc;
    MBasicBlock* current;
    uint32_t loopDepth_;

    Vector<BytecodeSite*, 0, JitAllocPolicy> trackedOptimizationSites_;

    BytecodeSite* bytecodeSite(jsbytecode* pc) {
        MOZ_ASSERT(info().inlineScriptTree()->script()->containsPC(pc));
        // See comment in maybeTrackedOptimizationSite.
        if (isOptimizationTrackingEnabled()) {
            if (BytecodeSite* site = maybeTrackedOptimizationSite(pc))
                return site;
        }
        return new(alloc()) BytecodeSite(info().inlineScriptTree(), pc);
    }

    BytecodeSite* maybeTrackedOptimizationSite(jsbytecode* pc);

    MDefinition* lexicalCheck_;

    void setLexicalCheck(MDefinition* lexical) {
        MOZ_ASSERT(!lexicalCheck_);
        lexicalCheck_ = lexical;
    }
    MDefinition* takeLexicalCheck() {
        MDefinition* lexical = lexicalCheck_;
        lexicalCheck_ = nullptr;
        return lexical;
    }

    /* Information used for inline-call builders. */
    MResumePoint* callerResumePoint_;
    jsbytecode* callerPC() {
        return callerResumePoint_ ? callerResumePoint_->pc() : nullptr;
    }
    IonBuilder* callerBuilder_;

    IonBuilder* outermostBuilder();

    struct LoopHeader {
        jsbytecode* pc;
        MBasicBlock* header;

        LoopHeader(jsbytecode* pc, MBasicBlock* header)
          : pc(pc), header(header)
        {}
    };

    Vector<CFGState, 8, JitAllocPolicy> cfgStack_;
    Vector<ControlFlowInfo, 4, JitAllocPolicy> loops_;
    Vector<ControlFlowInfo, 0, JitAllocPolicy> switches_;
    Vector<ControlFlowInfo, 2, JitAllocPolicy> labels_;
    Vector<MDefinition*, 2, JitAllocPolicy> iterators_;
    Vector<LoopHeader, 0, JitAllocPolicy> loopHeaders_;
    BaselineInspector* inspector;

    size_t inliningDepth_;

    // Total bytecode length of all inlined scripts. Only tracked for the
    // outermost builder.
    size_t inlinedBytecodeLength_;

    // Cutoff to disable compilation if excessive time is spent reanalyzing
    // loop bodies to compute a fixpoint of the types for loop variables.
    static const size_t MAX_LOOP_RESTARTS = 40;
    size_t numLoopRestarts_;

    // True if script->failedBoundsCheck is set for the current script or
    // an outer script.
    bool failedBoundsCheck_;

    // True if script->failedShapeGuard is set for the current script or
    // an outer script.
    bool failedShapeGuard_;

    // True if script->failedLexicalCheck_ is set for the current script or
    // an outer script.
    bool failedLexicalCheck_;

    // Has an iterator other than 'for in'.
    bool nonStringIteration_;

    // If this script can use a lazy arguments object, it will be pre-created
    // here.
    MInstruction* lazyArguments_;

    // If this is an inline builder, the call info for the builder.
    const CallInfo* inlineCallInfo_;

    // When compiling a call with multiple targets, we are first creating a
    // MGetPropertyCache.  This MGetPropertyCache is following the bytecode, and
    // is used to recover the JSFunction.  In some cases, the Type of the object
    // which own the property is enough for dispatching to the right function.
    // In such cases we do not have read the property, except when the type
    // object is unknown.
    //
    // As an optimization, we can dispatch a call based on the object group,
    // without doing the MGetPropertyCache.  This is what is achieved by
    // |IonBuilder::inlineCalls|.  As we might not know all the functions, we
    // are adding a fallback path, where this MGetPropertyCache would be moved
    // into.
    //
    // In order to build the fallback path, we have to capture a resume point
    // ahead, for the potential fallback path.  This resume point is captured
    // while building MGetPropertyCache.  It is capturing the state of Baseline
    // before the execution of the MGetPropertyCache, such as we can safely do
    // it in the fallback path.
    //
    // This field is used to discard the resume point if it is not used for
    // building a fallback path.

    // Discard the prior resume point while setting a new MGetPropertyCache.
    void replaceMaybeFallbackFunctionGetter(MGetPropertyCache* cache);

    // Discard the MGetPropertyCache if it is handled by WrapMGetPropertyCache.
    void keepFallbackFunctionGetter(MGetPropertyCache* cache) {
        if (cache == maybeFallbackFunctionGetter_)
            maybeFallbackFunctionGetter_ = nullptr;
    }

    MGetPropertyCache* maybeFallbackFunctionGetter_;

    // Used in tracking outcomes of optimization strategies for devtools.
    void startTrackingOptimizations();

    // The track* methods below are called often. Do not combine them with the
    // unchecked variants, despite the unchecked variants having no other
    // callers.
    void trackTypeInfo(JS::TrackedTypeSite site, MIRType mirType,
                       TemporaryTypeSet* typeSet)
    {
        if (MOZ_UNLIKELY(current->trackedSite()->hasOptimizations()))
            trackTypeInfoUnchecked(site, mirType, typeSet);
    }
    void trackTypeInfo(JS::TrackedTypeSite site, JSObject* obj) {
        if (MOZ_UNLIKELY(current->trackedSite()->hasOptimizations()))
            trackTypeInfoUnchecked(site, obj);
    }
    void trackTypeInfo(CallInfo& callInfo) {
        if (MOZ_UNLIKELY(current->trackedSite()->hasOptimizations()))
            trackTypeInfoUnchecked(callInfo);
    }
    void trackOptimizationAttempt(JS::TrackedStrategy strategy) {
        if (MOZ_UNLIKELY(current->trackedSite()->hasOptimizations()))
            trackOptimizationAttemptUnchecked(strategy);
    }
    void amendOptimizationAttempt(uint32_t index) {
        if (MOZ_UNLIKELY(current->trackedSite()->hasOptimizations()))
            amendOptimizationAttemptUnchecked(index);
    }
    void trackOptimizationOutcome(JS::TrackedOutcome outcome) {
        if (MOZ_UNLIKELY(current->trackedSite()->hasOptimizations()))
            trackOptimizationOutcomeUnchecked(outcome);
    }
    void trackOptimizationSuccess() {
        if (MOZ_UNLIKELY(current->trackedSite()->hasOptimizations()))
            trackOptimizationSuccessUnchecked();
    }
    void trackInlineSuccess(InliningStatus status = InliningStatus_Inlined) {
        if (MOZ_UNLIKELY(current->trackedSite()->hasOptimizations()))
            trackInlineSuccessUnchecked(status);
    }

    bool forceInlineCaches() {
        return MOZ_UNLIKELY(JitOptions.forceInlineCaches);
    }

    // Out-of-line variants that don't check if optimization tracking is
    // enabled.
    void trackTypeInfoUnchecked(JS::TrackedTypeSite site, MIRType mirType,
                                TemporaryTypeSet* typeSet);
    void trackTypeInfoUnchecked(JS::TrackedTypeSite site, JSObject* obj);
    void trackTypeInfoUnchecked(CallInfo& callInfo);
    void trackOptimizationAttemptUnchecked(JS::TrackedStrategy strategy);
    void amendOptimizationAttemptUnchecked(uint32_t index);
    void trackOptimizationOutcomeUnchecked(JS::TrackedOutcome outcome);
    void trackOptimizationSuccessUnchecked();
    void trackInlineSuccessUnchecked(InliningStatus status);
};

class CallInfo
{
    MDefinition* fun_;
    MDefinition* thisArg_;
    MDefinition* newTargetArg_;
    MDefinitionVector args_;

    bool constructing_:1;

    // True if the caller does not use the return value.
    bool ignoresReturnValue_:1;

    bool setter_:1;

  public:
    CallInfo(TempAllocator& alloc, bool constructing, bool ignoresReturnValue)
      : fun_(nullptr),
        thisArg_(nullptr),
        newTargetArg_(nullptr),
        args_(alloc),
        constructing_(constructing),
        ignoresReturnValue_(ignoresReturnValue),
        setter_(false)
    { }

    MOZ_MUST_USE bool init(CallInfo& callInfo) {
        MOZ_ASSERT(constructing_ == callInfo.constructing());

        fun_ = callInfo.fun();
        thisArg_ = callInfo.thisArg();
        ignoresReturnValue_ = callInfo.ignoresReturnValue();

        if (constructing())
            newTargetArg_ = callInfo.getNewTarget();

        if (!args_.appendAll(callInfo.argv()))
            return false;

        return true;
    }

    MOZ_MUST_USE bool init(MBasicBlock* current, uint32_t argc) {
        MOZ_ASSERT(args_.empty());

        // Get the arguments in the right order
        if (!args_.reserve(argc))
            return false;

        if (constructing())
            setNewTarget(current->pop());

        for (int32_t i = argc; i > 0; i--)
            args_.infallibleAppend(current->peek(-i));
        current->popn(argc);

        // Get |this| and |fun|
        setThis(current->pop());
        setFun(current->pop());

        return true;
    }

    void popFormals(MBasicBlock* current) {
        current->popn(numFormals());
    }

    void pushFormals(MBasicBlock* current) {
        current->push(fun());
        current->push(thisArg());

        for (uint32_t i = 0; i < argc(); i++)
            current->push(getArg(i));

        if (constructing())
            current->push(getNewTarget());
    }

    uint32_t argc() const {
        return args_.length();
    }
    uint32_t numFormals() const {
        return argc() + 2 + constructing();
    }

    MOZ_MUST_USE bool setArgs(const MDefinitionVector& args) {
        MOZ_ASSERT(args_.empty());
        return args_.appendAll(args);
    }

    MDefinitionVector& argv() {
        return args_;
    }

    const MDefinitionVector& argv() const {
        return args_;
    }

    MDefinition* getArg(uint32_t i) const {
        MOZ_ASSERT(i < argc());
        return args_[i];
    }

    MDefinition* getArgWithDefault(uint32_t i, MDefinition* defaultValue) const {
        if (i < argc())
            return args_[i];

        return defaultValue;
    }

    void setArg(uint32_t i, MDefinition* def) {
        MOZ_ASSERT(i < argc());
        args_[i] = def;
    }

    MDefinition* thisArg() const {
        MOZ_ASSERT(thisArg_);
        return thisArg_;
    }

    void setThis(MDefinition* thisArg) {
        thisArg_ = thisArg;
    }

    bool constructing() const {
        return constructing_;
    }

    bool ignoresReturnValue() const {
        return ignoresReturnValue_;
    }

    void setNewTarget(MDefinition* newTarget) {
        MOZ_ASSERT(constructing());
        newTargetArg_ = newTarget;
    }
    MDefinition* getNewTarget() const {
        MOZ_ASSERT(newTargetArg_);
        return newTargetArg_;
    }

    bool isSetter() const {
        return setter_;
    }
    void markAsSetter() {
        setter_ = true;
    }

    MDefinition* fun() const {
        MOZ_ASSERT(fun_);
        return fun_;
    }

    void setFun(MDefinition* fun) {
        fun_ = fun;
    }

    void setImplicitlyUsedUnchecked() {
        fun_->setImplicitlyUsedUnchecked();
        thisArg_->setImplicitlyUsedUnchecked();
        if (newTargetArg_)
            newTargetArg_->setImplicitlyUsedUnchecked();
        for (uint32_t i = 0; i < argc(); i++)
            getArg(i)->setImplicitlyUsedUnchecked();
    }
};

bool NeedsPostBarrier(MDefinition* value);

} // namespace jit
} // namespace js

#endif /* jit_IonBuilder_h */