Line data Source code
1 : // Copyright 2014 the V8 project authors. All rights reserved.
2 : // Use of this source code is governed by a BSD-style license that can be
3 : // found in the LICENSE file.
4 :
5 : #ifndef V8_COMPILER_COMMON_OPERATOR_H_
6 : #define V8_COMPILER_COMMON_OPERATOR_H_
7 :
8 : #include "src/base/compiler-specific.h"
9 : #include "src/compiler/frame-states.h"
10 : #include "src/deoptimize-reason.h"
11 : #include "src/globals.h"
12 : #include "src/machine-type.h"
13 : #include "src/reloc-info.h"
14 : #include "src/string-constants.h"
15 : #include "src/vector-slot-pair.h"
16 : #include "src/zone/zone-containers.h"
17 : #include "src/zone/zone-handle-set.h"
18 :
19 : namespace v8 {
20 : namespace internal {
21 :
22 : class StringConstantBase;
23 :
24 : namespace compiler {
25 :
26 : // Forward declarations.
27 : class CallDescriptor;
28 : struct CommonOperatorGlobalCache;
29 : class Operator;
30 : class Type;
31 : class Node;
32 :
33 : // Prediction hint for branches.
34 : enum class BranchHint : uint8_t { kNone, kTrue, kFalse };
35 :
36 7069 : inline BranchHint NegateBranchHint(BranchHint hint) {
37 7069 : switch (hint) {
38 : case BranchHint::kNone:
39 4813 : return hint;
40 : case BranchHint::kTrue:
41 : return BranchHint::kFalse;
42 : case BranchHint::kFalse:
43 2252 : return BranchHint::kTrue;
44 : }
45 0 : UNREACHABLE();
46 : }
47 :
48 45513 : inline size_t hash_value(BranchHint hint) { return static_cast<size_t>(hint); }
49 :
50 : V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream&, BranchHint);
51 :
52 : enum class IsSafetyCheck : uint8_t {
53 : kCriticalSafetyCheck,
54 : kSafetyCheck,
55 : kNoSafetyCheck
56 : };
57 :
58 : // Get the more critical safety check of the two arguments.
59 : IsSafetyCheck CombineSafetyChecks(IsSafetyCheck, IsSafetyCheck);
60 :
61 : V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream&, IsSafetyCheck);
62 : inline size_t hash_value(IsSafetyCheck is_safety_check) {
63 0 : return static_cast<size_t>(is_safety_check);
64 : }
65 :
66 : enum class TrapId : uint32_t {
67 : #define DEF_ENUM(Name, ...) k##Name,
68 : FOREACH_WASM_TRAPREASON(DEF_ENUM)
69 : #undef DEF_ENUM
70 : kInvalid
71 : };
72 :
73 0 : inline size_t hash_value(TrapId id) { return static_cast<uint32_t>(id); }
74 :
75 : std::ostream& operator<<(std::ostream&, TrapId trap_id);
76 :
77 : TrapId TrapIdOf(const Operator* const op);
78 :
79 : struct BranchOperatorInfo {
80 : BranchHint hint;
81 : IsSafetyCheck is_safety_check;
82 : };
83 :
84 0 : inline size_t hash_value(const BranchOperatorInfo& info) {
85 0 : return base::hash_combine(info.hint, info.is_safety_check);
86 : }
87 :
88 : V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream&, BranchOperatorInfo);
89 :
90 : inline bool operator==(const BranchOperatorInfo& a,
91 : const BranchOperatorInfo& b) {
92 0 : return a.hint == b.hint && a.is_safety_check == b.is_safety_check;
93 : }
94 :
95 : V8_EXPORT_PRIVATE const BranchOperatorInfo& BranchOperatorInfoOf(
96 : const Operator* const) V8_WARN_UNUSED_RESULT;
97 : V8_EXPORT_PRIVATE BranchHint BranchHintOf(const Operator* const)
98 : V8_WARN_UNUSED_RESULT;
99 :
100 : // Helper function for return nodes, because returns have a hidden value input.
101 : int ValueInputCountOfReturn(Operator const* const op);
102 :
103 : // Parameters for the {Deoptimize} operator.
104 : class DeoptimizeParameters final {
105 : public:
106 : DeoptimizeParameters(DeoptimizeKind kind, DeoptimizeReason reason,
107 : VectorSlotPair const& feedback,
108 : IsSafetyCheck is_safety_check)
109 : : kind_(kind),
110 : reason_(reason),
111 : feedback_(feedback),
112 902286 : is_safety_check_(is_safety_check) {}
113 :
114 : DeoptimizeKind kind() const { return kind_; }
115 : DeoptimizeReason reason() const { return reason_; }
116 : const VectorSlotPair& feedback() const { return feedback_; }
117 : IsSafetyCheck is_safety_check() const { return is_safety_check_; }
118 :
119 : private:
120 : DeoptimizeKind const kind_;
121 : DeoptimizeReason const reason_;
122 : VectorSlotPair const feedback_;
123 : IsSafetyCheck is_safety_check_;
124 : };
125 :
126 : bool operator==(DeoptimizeParameters, DeoptimizeParameters);
127 : bool operator!=(DeoptimizeParameters, DeoptimizeParameters);
128 :
129 : size_t hast_value(DeoptimizeParameters p);
130 :
131 : std::ostream& operator<<(std::ostream&, DeoptimizeParameters p);
132 :
133 : DeoptimizeParameters const& DeoptimizeParametersOf(Operator const* const)
134 : V8_WARN_UNUSED_RESULT;
135 :
136 : IsSafetyCheck IsSafetyCheckOf(const Operator* op) V8_WARN_UNUSED_RESULT;
137 :
138 : class SelectParameters final {
139 : public:
140 : explicit SelectParameters(MachineRepresentation representation,
141 : BranchHint hint = BranchHint::kNone)
142 : : representation_(representation), hint_(hint) {}
143 :
144 : MachineRepresentation representation() const { return representation_; }
145 : BranchHint hint() const { return hint_; }
146 :
147 : private:
148 : const MachineRepresentation representation_;
149 : const BranchHint hint_;
150 : };
151 :
152 : bool operator==(SelectParameters const&, SelectParameters const&);
153 : bool operator!=(SelectParameters const&, SelectParameters const&);
154 :
155 : size_t hash_value(SelectParameters const& p);
156 :
157 : std::ostream& operator<<(std::ostream&, SelectParameters const& p);
158 :
159 : V8_EXPORT_PRIVATE SelectParameters const& SelectParametersOf(
160 : const Operator* const) V8_WARN_UNUSED_RESULT;
161 :
162 : V8_EXPORT_PRIVATE CallDescriptor const* CallDescriptorOf(const Operator* const)
163 : V8_WARN_UNUSED_RESULT;
164 :
165 : V8_EXPORT_PRIVATE size_t ProjectionIndexOf(const Operator* const)
166 : V8_WARN_UNUSED_RESULT;
167 :
168 : V8_EXPORT_PRIVATE MachineRepresentation
169 : PhiRepresentationOf(const Operator* const) V8_WARN_UNUSED_RESULT;
170 :
171 : // The {IrOpcode::kParameter} opcode represents an incoming parameter to the
172 : // function. This class bundles the index and a debug name for such operators.
173 : class ParameterInfo final {
174 : public:
175 : ParameterInfo(int index, const char* debug_name)
176 : : index_(index), debug_name_(debug_name) {}
177 :
178 : int index() const { return index_; }
179 : const char* debug_name() const { return debug_name_; }
180 :
181 : private:
182 : int index_;
183 : const char* debug_name_;
184 : };
185 :
186 : std::ostream& operator<<(std::ostream&, ParameterInfo const&);
187 :
188 : V8_EXPORT_PRIVATE int ParameterIndexOf(const Operator* const)
189 : V8_WARN_UNUSED_RESULT;
190 : const ParameterInfo& ParameterInfoOf(const Operator* const)
191 : V8_WARN_UNUSED_RESULT;
192 :
193 : struct ObjectStateInfo final : std::pair<uint32_t, int> {
194 : ObjectStateInfo(uint32_t object_id, int size)
195 : : std::pair<uint32_t, int>(object_id, size) {}
196 : uint32_t object_id() const { return first; }
197 : int size() const { return second; }
198 : };
199 : std::ostream& operator<<(std::ostream&, ObjectStateInfo const&);
200 : size_t hash_value(ObjectStateInfo const& p);
201 :
202 : struct TypedObjectStateInfo final
203 : : std::pair<uint32_t, const ZoneVector<MachineType>*> {
204 : TypedObjectStateInfo(uint32_t object_id,
205 : const ZoneVector<MachineType>* machine_types)
206 : : std::pair<uint32_t, const ZoneVector<MachineType>*>(object_id,
207 : machine_types) {}
208 : uint32_t object_id() const { return first; }
209 : const ZoneVector<MachineType>* machine_types() const { return second; }
210 : };
211 : std::ostream& operator<<(std::ostream&, TypedObjectStateInfo const&);
212 : size_t hash_value(TypedObjectStateInfo const& p);
213 :
214 : class RelocatablePtrConstantInfo final {
215 : public:
216 : enum Type { kInt32, kInt64 };
217 :
218 : RelocatablePtrConstantInfo(int32_t value, RelocInfo::Mode rmode)
219 0 : : value_(value), rmode_(rmode), type_(kInt32) {}
220 : RelocatablePtrConstantInfo(int64_t value, RelocInfo::Mode rmode)
221 : : value_(value), rmode_(rmode), type_(kInt64) {}
222 :
223 : intptr_t value() const { return value_; }
224 : RelocInfo::Mode rmode() const { return rmode_; }
225 : Type type() const { return type_; }
226 :
227 : private:
228 : intptr_t value_;
229 : RelocInfo::Mode rmode_;
230 : Type type_;
231 : };
232 :
233 : bool operator==(RelocatablePtrConstantInfo const& lhs,
234 : RelocatablePtrConstantInfo const& rhs);
235 : bool operator!=(RelocatablePtrConstantInfo const& lhs,
236 : RelocatablePtrConstantInfo const& rhs);
237 :
238 : std::ostream& operator<<(std::ostream&, RelocatablePtrConstantInfo const&);
239 :
240 : size_t hash_value(RelocatablePtrConstantInfo const& p);
241 :
242 : // Used to define a sparse set of inputs. This can be used to efficiently encode
243 : // nodes that can have a lot of inputs, but where many inputs can have the same
244 : // value.
245 : class SparseInputMask final {
246 : public:
247 : using BitMaskType = uint32_t;
248 :
249 : // The mask representing a dense input set.
250 : static const BitMaskType kDenseBitMask = 0x0;
251 : // The bits representing the end of a sparse input set.
252 : static const BitMaskType kEndMarker = 0x1;
253 : // The mask for accessing a sparse input entry in the bitmask.
254 : static const BitMaskType kEntryMask = 0x1;
255 :
256 : // The number of bits in the mask, minus one for the end marker.
257 : static const int kMaxSparseInputs = (sizeof(BitMaskType) * kBitsPerByte - 1);
258 :
259 : // An iterator over a node's sparse inputs.
260 : class InputIterator final {
261 : public:
262 : InputIterator() = default;
263 : InputIterator(BitMaskType bit_mask, Node* parent);
264 :
265 : Node* parent() const { return parent_; }
266 : int real_index() const { return real_index_; }
267 :
268 : // Advance the iterator to the next sparse input. Only valid if the iterator
269 : // has not reached the end.
270 : void Advance();
271 :
272 : // Get the current sparse input's real node value. Only valid if the
273 : // current sparse input is real.
274 : Node* GetReal() const;
275 :
276 : // Get the current sparse input, returning either a real input node if
277 : // the current sparse input is real, or the given {empty_value} if the
278 : // current sparse input is empty.
279 : Node* Get(Node* empty_value) const {
280 42544168 : return IsReal() ? GetReal() : empty_value;
281 : }
282 :
283 : // True if the current sparse input is a real input node.
284 : bool IsReal() const;
285 :
286 : // True if the current sparse input is an empty value.
287 140141430 : bool IsEmpty() const { return !IsReal(); }
288 :
289 : // True if the iterator has reached the end of the sparse inputs.
290 : bool IsEnd() const;
291 :
292 : private:
293 : BitMaskType bit_mask_;
294 : Node* parent_;
295 : int real_index_;
296 : };
297 :
298 9021895 : explicit SparseInputMask(BitMaskType bit_mask) : bit_mask_(bit_mask) {}
299 :
300 : // Provides a SparseInputMask representing a dense input set.
301 : static SparseInputMask Dense() { return SparseInputMask(kDenseBitMask); }
302 :
303 25409811 : BitMaskType mask() const { return bit_mask_; }
304 :
305 3642100 : bool IsDense() const { return bit_mask_ == SparseInputMask::kDenseBitMask; }
306 :
307 : // Counts how many real values are in the sparse array. Only valid for
308 : // non-dense masks.
309 : int CountReal() const;
310 :
311 : // Returns an iterator over the sparse inputs of {node}.
312 : InputIterator IterateOverInputs(Node* node);
313 :
314 : private:
315 : //
316 : // The sparse input mask has a bitmask specifying if the node's inputs are
317 : // represented sparsely. If the bitmask value is 0, then the inputs are dense;
318 : // otherwise, they should be interpreted as follows:
319 : //
320 : // * The bitmask represents which values are real, with 1 for real values
321 : // and 0 for empty values.
322 : // * The inputs to the node are the real values, in the order of the 1s from
323 : // least- to most-significant.
324 : // * The top bit of the bitmask is a guard indicating the end of the values,
325 : // whether real or empty (and is not representative of a real input
326 : // itself). This is used so that we don't have to additionally store a
327 : // value count.
328 : //
329 : // So, for N 1s in the bitmask, there are N - 1 inputs into the node.
330 : BitMaskType bit_mask_;
331 : };
332 :
333 : bool operator==(SparseInputMask const& lhs, SparseInputMask const& rhs);
334 : bool operator!=(SparseInputMask const& lhs, SparseInputMask const& rhs);
335 :
336 : class TypedStateValueInfo final {
337 : public:
338 : TypedStateValueInfo(ZoneVector<MachineType> const* machine_types,
339 : SparseInputMask sparse_input_mask)
340 : : machine_types_(machine_types), sparse_input_mask_(sparse_input_mask) {}
341 :
342 : ZoneVector<MachineType> const* machine_types() const {
343 : return machine_types_;
344 : }
345 : SparseInputMask sparse_input_mask() const { return sparse_input_mask_; }
346 :
347 : private:
348 : ZoneVector<MachineType> const* machine_types_;
349 : SparseInputMask sparse_input_mask_;
350 : };
351 :
352 : bool operator==(TypedStateValueInfo const& lhs, TypedStateValueInfo const& rhs);
353 : bool operator!=(TypedStateValueInfo const& lhs, TypedStateValueInfo const& rhs);
354 :
355 : std::ostream& operator<<(std::ostream&, TypedStateValueInfo const&);
356 :
357 : size_t hash_value(TypedStateValueInfo const& p);
358 :
359 : // Used to mark a region (as identified by BeginRegion/FinishRegion) as either
360 : // JavaScript-observable or not (i.e. allocations are not JavaScript observable
361 : // themselves, but transitioning stores are).
362 : enum class RegionObservability : uint8_t { kObservable, kNotObservable };
363 :
364 : size_t hash_value(RegionObservability);
365 :
366 : std::ostream& operator<<(std::ostream&, RegionObservability);
367 :
368 : RegionObservability RegionObservabilityOf(Operator const*)
369 : V8_WARN_UNUSED_RESULT;
370 :
371 : std::ostream& operator<<(std::ostream& os,
372 : const ZoneVector<MachineType>* types);
373 :
374 : Type TypeGuardTypeOf(Operator const*) V8_WARN_UNUSED_RESULT;
375 :
376 : int OsrValueIndexOf(Operator const*) V8_WARN_UNUSED_RESULT;
377 :
378 : SparseInputMask SparseInputMaskOf(Operator const*) V8_WARN_UNUSED_RESULT;
379 :
380 : ZoneVector<MachineType> const* MachineTypesOf(Operator const*)
381 : V8_WARN_UNUSED_RESULT;
382 :
383 : // The ArgumentsElementsState and ArgumentsLengthState can describe the layout
384 : // for backing stores of arguments objects of various types:
385 : //
386 : // +------------------------------------+
387 : // - kUnmappedArguments: | arg0, ... argK-1, argK, ... argN-1 | {length:N}
388 : // +------------------------------------+
389 : // +------------------------------------+
390 : // - kMappedArguments: | hole, ... hole, argK, ... argN-1 | {length:N}
391 : // +------------------------------------+
392 : // +------------------+
393 : // - kRestParameter: | argK, ... argN-1 | {length:N-K}
394 : // +------------------+
395 : //
396 : // Here {K} represents the number for formal parameters of the active function,
397 : // whereas {N} represents the actual number of arguments passed at runtime.
398 : // Note that {N < K} can happen and causes {K} to be capped accordingly.
399 : //
400 : // Also note that it is possible for an arguments object of {kMappedArguments}
401 : // type to carry a backing store of {kUnappedArguments} type when {K == 0}.
402 : using ArgumentsStateType = CreateArgumentsType;
403 :
404 : ArgumentsStateType ArgumentsStateTypeOf(Operator const*) V8_WARN_UNUSED_RESULT;
405 :
406 : uint32_t ObjectIdOf(Operator const*);
407 :
408 : MachineRepresentation DeadValueRepresentationOf(Operator const*)
409 : V8_WARN_UNUSED_RESULT;
410 :
411 : class IfValueParameters final {
412 : public:
413 : IfValueParameters(int32_t value, int32_t comparison_order,
414 : BranchHint hint = BranchHint::kNone)
415 10004 : : value_(value), comparison_order_(comparison_order), hint_(hint) {}
416 :
417 : int32_t value() const { return value_; }
418 : int32_t comparison_order() const { return comparison_order_; }
419 : BranchHint hint() const { return hint_; }
420 :
421 : private:
422 : int32_t value_;
423 : int32_t comparison_order_;
424 : BranchHint hint_;
425 : };
426 :
427 : V8_EXPORT_PRIVATE bool operator==(IfValueParameters const&,
428 : IfValueParameters const&);
429 :
430 : size_t hash_value(IfValueParameters const&);
431 :
432 : V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream&,
433 : IfValueParameters const&);
434 :
435 : V8_EXPORT_PRIVATE IfValueParameters const& IfValueParametersOf(
436 : const Operator* op) V8_WARN_UNUSED_RESULT;
437 :
438 : const FrameStateInfo& FrameStateInfoOf(const Operator* op)
439 : V8_WARN_UNUSED_RESULT;
440 :
441 : V8_EXPORT_PRIVATE Handle<HeapObject> HeapConstantOf(const Operator* op)
442 : V8_WARN_UNUSED_RESULT;
443 :
444 : const StringConstantBase* StringConstantBaseOf(const Operator* op)
445 : V8_WARN_UNUSED_RESULT;
446 :
447 : // Interface for building common operators that can be used at any level of IR,
448 : // including JavaScript, mid-level, and low-level.
449 : class V8_EXPORT_PRIVATE CommonOperatorBuilder final
450 : : public NON_EXPORTED_BASE(ZoneObject) {
451 : public:
452 : explicit CommonOperatorBuilder(Zone* zone);
453 :
454 : const Operator* Dead();
455 : const Operator* DeadValue(MachineRepresentation rep);
456 : const Operator* Unreachable();
457 : const Operator* End(size_t control_input_count);
458 : const Operator* Branch(BranchHint = BranchHint::kNone,
459 : IsSafetyCheck = IsSafetyCheck::kSafetyCheck);
460 : const Operator* IfTrue();
461 : const Operator* IfFalse();
462 : const Operator* IfSuccess();
463 : const Operator* IfException();
464 : const Operator* Switch(size_t control_output_count);
465 : const Operator* IfValue(int32_t value, int32_t order = 0,
466 : BranchHint hint = BranchHint::kNone);
467 : const Operator* IfDefault(BranchHint hint = BranchHint::kNone);
468 : const Operator* Throw();
469 : const Operator* Deoptimize(DeoptimizeKind kind, DeoptimizeReason reason,
470 : VectorSlotPair const& feedback);
471 : const Operator* DeoptimizeIf(
472 : DeoptimizeKind kind, DeoptimizeReason reason,
473 : VectorSlotPair const& feedback,
474 : IsSafetyCheck is_safety_check = IsSafetyCheck::kSafetyCheck);
475 : const Operator* DeoptimizeUnless(
476 : DeoptimizeKind kind, DeoptimizeReason reason,
477 : VectorSlotPair const& feedback,
478 : IsSafetyCheck is_safety_check = IsSafetyCheck::kSafetyCheck);
479 : const Operator* TrapIf(TrapId trap_id);
480 : const Operator* TrapUnless(TrapId trap_id);
481 : const Operator* Return(int value_input_count = 1);
482 : const Operator* Terminate();
483 :
484 : const Operator* Start(int value_output_count);
485 : const Operator* Loop(int control_input_count);
486 : const Operator* Merge(int control_input_count);
487 : const Operator* Parameter(int index, const char* debug_name = nullptr);
488 :
489 : const Operator* OsrNormalEntry();
490 : const Operator* OsrLoopEntry();
491 : const Operator* OsrValue(int index);
492 :
493 : const Operator* Int32Constant(int32_t);
494 : const Operator* Int64Constant(int64_t);
495 : const Operator* Float32Constant(volatile float);
496 : const Operator* Float64Constant(volatile double);
497 : const Operator* ExternalConstant(const ExternalReference&);
498 : const Operator* NumberConstant(volatile double);
499 : const Operator* PointerConstant(intptr_t);
500 : const Operator* HeapConstant(const Handle<HeapObject>&);
501 : const Operator* ObjectId(uint32_t);
502 :
503 : const Operator* RelocatableInt32Constant(int32_t value,
504 : RelocInfo::Mode rmode);
505 : const Operator* RelocatableInt64Constant(int64_t value,
506 : RelocInfo::Mode rmode);
507 :
508 : const Operator* Select(MachineRepresentation, BranchHint = BranchHint::kNone);
509 : const Operator* Phi(MachineRepresentation representation,
510 : int value_input_count);
511 : const Operator* EffectPhi(int effect_input_count);
512 : const Operator* InductionVariablePhi(int value_input_count);
513 : const Operator* LoopExit();
514 : const Operator* LoopExitValue();
515 : const Operator* LoopExitEffect();
516 : const Operator* Checkpoint();
517 : const Operator* BeginRegion(RegionObservability);
518 : const Operator* FinishRegion();
519 : const Operator* StateValues(int arguments, SparseInputMask bitmask);
520 : const Operator* TypedStateValues(const ZoneVector<MachineType>* types,
521 : SparseInputMask bitmask);
522 : const Operator* ArgumentsElementsState(ArgumentsStateType type);
523 : const Operator* ArgumentsLengthState(ArgumentsStateType type);
524 : const Operator* ObjectState(uint32_t object_id, int pointer_slots);
525 : const Operator* TypedObjectState(uint32_t object_id,
526 : const ZoneVector<MachineType>* types);
527 : const Operator* FrameState(BailoutId bailout_id,
528 : OutputFrameStateCombine state_combine,
529 : const FrameStateFunctionInfo* function_info);
530 : const Operator* Call(const CallDescriptor* call_descriptor);
531 : const Operator* CallWithCallerSavedRegisters(
532 : const CallDescriptor* call_descriptor);
533 : const Operator* TailCall(const CallDescriptor* call_descriptor);
534 : const Operator* Projection(size_t index);
535 : const Operator* Retain();
536 : const Operator* TypeGuard(Type type);
537 :
538 : // Constructs a new merge or phi operator with the same opcode as {op}, but
539 : // with {size} inputs.
540 : const Operator* ResizeMergeOrPhi(const Operator* op, int size);
541 :
542 : // Constructs function info for frame state construction.
543 : const FrameStateFunctionInfo* CreateFrameStateFunctionInfo(
544 : FrameStateType type, int parameter_count, int local_count,
545 : Handle<SharedFunctionInfo> shared_info);
546 :
547 : const Operator* MarkAsSafetyCheck(const Operator* op,
548 : IsSafetyCheck safety_check);
549 :
550 : const Operator* DelayedStringConstant(const StringConstantBase* str);
551 :
552 : private:
553 : Zone* zone() const { return zone_; }
554 :
555 : const CommonOperatorGlobalCache& cache_;
556 : Zone* const zone_;
557 :
558 : DISALLOW_COPY_AND_ASSIGN(CommonOperatorBuilder);
559 : };
560 :
561 : } // namespace compiler
562 : } // namespace internal
563 : } // namespace v8
564 :
565 : #endif // V8_COMPILER_COMMON_OPERATOR_H_
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