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      1 //===- Record.cpp - Record implementation ---------------------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // Implement the tablegen record classes.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #include "llvm/TableGen/Record.h"
     15 #include "llvm/ADT/DenseMap.h"
     16 #include "llvm/ADT/FoldingSet.h"
     17 #include "llvm/ADT/Hashing.h"
     18 #include "llvm/ADT/STLExtras.h"
     19 #include "llvm/ADT/SmallVector.h"
     20 #include "llvm/ADT/StringExtras.h"
     21 #include "llvm/ADT/StringMap.h"
     22 #include "llvm/Support/DataTypes.h"
     23 #include "llvm/Support/ErrorHandling.h"
     24 #include "llvm/Support/Format.h"
     25 #include "llvm/TableGen/Error.h"
     26 
     27 using namespace llvm;
     28 
     29 //===----------------------------------------------------------------------===//
     30 //    std::string wrapper for DenseMap purposes
     31 //===----------------------------------------------------------------------===//
     32 
     33 namespace llvm {
     34 
     35 /// This is a wrapper for std::string suitable for using as a key to a DenseMap.
     36 /// Because there isn't a particularly
     37 /// good way to indicate tombstone or empty keys for strings, we want
     38 /// to wrap std::string to indicate that this is a "special" string
     39 /// not expected to take on certain values (those of the tombstone and
     40 /// empty keys).  This makes things a little safer as it clarifies
     41 /// that DenseMap is really not appropriate for general strings.
     42 
     43 class TableGenStringKey {
     44 public:
     45   TableGenStringKey(const std::string &str) : data(str) {}
     46   TableGenStringKey(const char *str) : data(str) {}
     47 
     48   const std::string &str() const { return data; }
     49 
     50   friend hash_code hash_value(const TableGenStringKey &Value) {
     51     using llvm::hash_value;
     52     return hash_value(Value.str());
     53   }
     54 private:
     55   std::string data;
     56 };
     57 
     58 /// Specialize DenseMapInfo for TableGenStringKey.
     59 template<> struct DenseMapInfo<TableGenStringKey> {
     60   static inline TableGenStringKey getEmptyKey() {
     61     TableGenStringKey Empty("<<<EMPTY KEY>>>");
     62     return Empty;
     63   }
     64   static inline TableGenStringKey getTombstoneKey() {
     65     TableGenStringKey Tombstone("<<<TOMBSTONE KEY>>>");
     66     return Tombstone;
     67   }
     68   static unsigned getHashValue(const TableGenStringKey& Val) {
     69     using llvm::hash_value;
     70     return hash_value(Val);
     71   }
     72   static bool isEqual(const TableGenStringKey& LHS,
     73                       const TableGenStringKey& RHS) {
     74     return LHS.str() == RHS.str();
     75   }
     76 };
     77 
     78 } // namespace llvm
     79 
     80 //===----------------------------------------------------------------------===//
     81 //    Type implementations
     82 //===----------------------------------------------------------------------===//
     83 
     84 BitRecTy BitRecTy::Shared;
     85 CodeRecTy CodeRecTy::Shared;
     86 IntRecTy IntRecTy::Shared;
     87 StringRecTy StringRecTy::Shared;
     88 DagRecTy DagRecTy::Shared;
     89 
     90 LLVM_DUMP_METHOD void RecTy::dump() const { print(errs()); }
     91 
     92 ListRecTy *RecTy::getListTy() {
     93   if (!ListTy)
     94     ListTy.reset(new ListRecTy(this));
     95   return ListTy.get();
     96 }
     97 
     98 bool RecTy::typeIsConvertibleTo(const RecTy *RHS) const {
     99   assert(RHS && "NULL pointer");
    100   return Kind == RHS->getRecTyKind();
    101 }
    102 
    103 bool BitRecTy::typeIsConvertibleTo(const RecTy *RHS) const{
    104   if (RecTy::typeIsConvertibleTo(RHS) || RHS->getRecTyKind() == IntRecTyKind)
    105     return true;
    106   if (const BitsRecTy *BitsTy = dyn_cast<BitsRecTy>(RHS))
    107     return BitsTy->getNumBits() == 1;
    108   return false;
    109 }
    110 
    111 BitsRecTy *BitsRecTy::get(unsigned Sz) {
    112   static std::vector<std::unique_ptr<BitsRecTy>> Shared;
    113   if (Sz >= Shared.size())
    114     Shared.resize(Sz + 1);
    115   std::unique_ptr<BitsRecTy> &Ty = Shared[Sz];
    116   if (!Ty)
    117     Ty.reset(new BitsRecTy(Sz));
    118   return Ty.get();
    119 }
    120 
    121 std::string BitsRecTy::getAsString() const {
    122   return "bits<" + utostr(Size) + ">";
    123 }
    124 
    125 bool BitsRecTy::typeIsConvertibleTo(const RecTy *RHS) const {
    126   if (RecTy::typeIsConvertibleTo(RHS)) //argument and the sender are same type
    127     return cast<BitsRecTy>(RHS)->Size == Size;
    128   RecTyKind kind = RHS->getRecTyKind();
    129   return (kind == BitRecTyKind && Size == 1) || (kind == IntRecTyKind);
    130 }
    131 
    132 bool IntRecTy::typeIsConvertibleTo(const RecTy *RHS) const {
    133   RecTyKind kind = RHS->getRecTyKind();
    134   return kind==BitRecTyKind || kind==BitsRecTyKind || kind==IntRecTyKind;
    135 }
    136 
    137 std::string StringRecTy::getAsString() const {
    138   return "string";
    139 }
    140 
    141 std::string ListRecTy::getAsString() const {
    142   return "list<" + Ty->getAsString() + ">";
    143 }
    144 
    145 bool ListRecTy::typeIsConvertibleTo(const RecTy *RHS) const {
    146   if (const auto *ListTy = dyn_cast<ListRecTy>(RHS))
    147     return Ty->typeIsConvertibleTo(ListTy->getElementType());
    148   return false;
    149 }
    150 
    151 std::string DagRecTy::getAsString() const {
    152   return "dag";
    153 }
    154 
    155 RecordRecTy *RecordRecTy::get(Record *R) {
    156   return dyn_cast<RecordRecTy>(R->getDefInit()->getType());
    157 }
    158 
    159 std::string RecordRecTy::getAsString() const {
    160   return Rec->getName();
    161 }
    162 
    163 bool RecordRecTy::typeIsConvertibleTo(const RecTy *RHS) const {
    164   const RecordRecTy *RTy = dyn_cast<RecordRecTy>(RHS);
    165   if (!RTy)
    166     return false;
    167 
    168   if (RTy->getRecord() == Rec || Rec->isSubClassOf(RTy->getRecord()))
    169     return true;
    170 
    171   for (const auto &SCPair : RTy->getRecord()->getSuperClasses())
    172     if (Rec->isSubClassOf(SCPair.first))
    173       return true;
    174 
    175   return false;
    176 }
    177 
    178 RecTy *llvm::resolveTypes(RecTy *T1, RecTy *T2) {
    179   if (T1->typeIsConvertibleTo(T2))
    180     return T2;
    181   if (T2->typeIsConvertibleTo(T1))
    182     return T1;
    183 
    184   // If one is a Record type, check superclasses
    185   if (RecordRecTy *RecTy1 = dyn_cast<RecordRecTy>(T1)) {
    186     // See if T2 inherits from a type T1 also inherits from
    187     for (const auto &SuperPair1 : RecTy1->getRecord()->getSuperClasses()) {
    188       RecordRecTy *SuperRecTy1 = RecordRecTy::get(SuperPair1.first);
    189       RecTy *NewType1 = resolveTypes(SuperRecTy1, T2);
    190       if (NewType1)
    191         return NewType1;
    192     }
    193   }
    194   if (RecordRecTy *RecTy2 = dyn_cast<RecordRecTy>(T2)) {
    195     // See if T1 inherits from a type T2 also inherits from
    196     for (const auto &SuperPair2 : RecTy2->getRecord()->getSuperClasses()) {
    197       RecordRecTy *SuperRecTy2 = RecordRecTy::get(SuperPair2.first);
    198       RecTy *NewType2 = resolveTypes(T1, SuperRecTy2);
    199       if (NewType2)
    200         return NewType2;
    201     }
    202   }
    203   return nullptr;
    204 }
    205 
    206 
    207 //===----------------------------------------------------------------------===//
    208 //    Initializer implementations
    209 //===----------------------------------------------------------------------===//
    210 
    211 void Init::anchor() { }
    212 LLVM_DUMP_METHOD void Init::dump() const { return print(errs()); }
    213 
    214 UnsetInit *UnsetInit::get() {
    215   static UnsetInit TheInit;
    216   return &TheInit;
    217 }
    218 
    219 Init *UnsetInit::convertInitializerTo(RecTy *Ty) const {
    220   if (auto *BRT = dyn_cast<BitsRecTy>(Ty)) {
    221     SmallVector<Init *, 16> NewBits(BRT->getNumBits());
    222 
    223     for (unsigned i = 0; i != BRT->getNumBits(); ++i)
    224       NewBits[i] = UnsetInit::get();
    225 
    226     return BitsInit::get(NewBits);
    227   }
    228 
    229   // All other types can just be returned.
    230   return const_cast<UnsetInit *>(this);
    231 }
    232 
    233 BitInit *BitInit::get(bool V) {
    234   static BitInit True(true);
    235   static BitInit False(false);
    236 
    237   return V ? &True : &False;
    238 }
    239 
    240 Init *BitInit::convertInitializerTo(RecTy *Ty) const {
    241   if (isa<BitRecTy>(Ty))
    242     return const_cast<BitInit *>(this);
    243 
    244   if (isa<IntRecTy>(Ty))
    245     return IntInit::get(getValue());
    246 
    247   if (auto *BRT = dyn_cast<BitsRecTy>(Ty)) {
    248     // Can only convert single bit.
    249     if (BRT->getNumBits() == 1)
    250       return BitsInit::get(const_cast<BitInit *>(this));
    251   }
    252 
    253   return nullptr;
    254 }
    255 
    256 static void
    257 ProfileBitsInit(FoldingSetNodeID &ID, ArrayRef<Init *> Range) {
    258   ID.AddInteger(Range.size());
    259 
    260   for (Init *I : Range)
    261     ID.AddPointer(I);
    262 }
    263 
    264 BitsInit *BitsInit::get(ArrayRef<Init *> Range) {
    265   static FoldingSet<BitsInit> ThePool;
    266   static std::vector<std::unique_ptr<BitsInit>> TheActualPool;
    267 
    268   FoldingSetNodeID ID;
    269   ProfileBitsInit(ID, Range);
    270 
    271   void *IP = nullptr;
    272   if (BitsInit *I = ThePool.FindNodeOrInsertPos(ID, IP))
    273     return I;
    274 
    275   void *Mem = ::operator new (totalSizeToAlloc<Init *>(Range.size()));
    276   BitsInit *I = new (Mem) BitsInit(Range.size());
    277   std::uninitialized_copy(Range.begin(), Range.end(),
    278                           I->getTrailingObjects<Init *>());
    279   ThePool.InsertNode(I, IP);
    280   TheActualPool.push_back(std::unique_ptr<BitsInit>(I));
    281   return I;
    282 }
    283 
    284 void BitsInit::Profile(FoldingSetNodeID &ID) const {
    285   ProfileBitsInit(ID, makeArrayRef(getTrailingObjects<Init *>(), NumBits));
    286 }
    287 
    288 Init *BitsInit::convertInitializerTo(RecTy *Ty) const {
    289   if (isa<BitRecTy>(Ty)) {
    290     if (getNumBits() != 1) return nullptr; // Only accept if just one bit!
    291     return getBit(0);
    292   }
    293 
    294   if (auto *BRT = dyn_cast<BitsRecTy>(Ty)) {
    295     // If the number of bits is right, return it.  Otherwise we need to expand
    296     // or truncate.
    297     if (getNumBits() != BRT->getNumBits()) return nullptr;
    298     return const_cast<BitsInit *>(this);
    299   }
    300 
    301   if (isa<IntRecTy>(Ty)) {
    302     int64_t Result = 0;
    303     for (unsigned i = 0, e = getNumBits(); i != e; ++i)
    304       if (auto *Bit = dyn_cast<BitInit>(getBit(i)))
    305         Result |= static_cast<int64_t>(Bit->getValue()) << i;
    306       else
    307         return nullptr;
    308     return IntInit::get(Result);
    309   }
    310 
    311   return nullptr;
    312 }
    313 
    314 Init *
    315 BitsInit::convertInitializerBitRange(const std::vector<unsigned> &Bits) const {
    316   SmallVector<Init *, 16> NewBits(Bits.size());
    317 
    318   for (unsigned i = 0, e = Bits.size(); i != e; ++i) {
    319     if (Bits[i] >= getNumBits())
    320       return nullptr;
    321     NewBits[i] = getBit(Bits[i]);
    322   }
    323   return BitsInit::get(NewBits);
    324 }
    325 
    326 std::string BitsInit::getAsString() const {
    327   std::string Result = "{ ";
    328   for (unsigned i = 0, e = getNumBits(); i != e; ++i) {
    329     if (i) Result += ", ";
    330     if (Init *Bit = getBit(e-i-1))
    331       Result += Bit->getAsString();
    332     else
    333       Result += "*";
    334   }
    335   return Result + " }";
    336 }
    337 
    338 // Fix bit initializer to preserve the behavior that bit reference from a unset
    339 // bits initializer will resolve into VarBitInit to keep the field name and bit
    340 // number used in targets with fixed insn length.
    341 static Init *fixBitInit(const RecordVal *RV, Init *Before, Init *After) {
    342   if (RV || !isa<UnsetInit>(After))
    343     return After;
    344   return Before;
    345 }
    346 
    347 // resolveReferences - If there are any field references that refer to fields
    348 // that have been filled in, we can propagate the values now.
    349 //
    350 Init *BitsInit::resolveReferences(Record &R, const RecordVal *RV) const {
    351   bool Changed = false;
    352   SmallVector<Init *, 16> NewBits(getNumBits());
    353 
    354   Init *CachedInit = nullptr;
    355   Init *CachedBitVar = nullptr;
    356   bool CachedBitVarChanged = false;
    357 
    358   for (unsigned i = 0, e = getNumBits(); i != e; ++i) {
    359     Init *CurBit = getBit(i);
    360     Init *CurBitVar = CurBit->getBitVar();
    361 
    362     NewBits[i] = CurBit;
    363 
    364     if (CurBitVar == CachedBitVar) {
    365       if (CachedBitVarChanged) {
    366         Init *Bit = CachedInit->getBit(CurBit->getBitNum());
    367         NewBits[i] = fixBitInit(RV, CurBit, Bit);
    368       }
    369       continue;
    370     }
    371     CachedBitVar = CurBitVar;
    372     CachedBitVarChanged = false;
    373 
    374     Init *B;
    375     do {
    376       B = CurBitVar;
    377       CurBitVar = CurBitVar->resolveReferences(R, RV);
    378       CachedBitVarChanged |= B != CurBitVar;
    379       Changed |= B != CurBitVar;
    380     } while (B != CurBitVar);
    381     CachedInit = CurBitVar;
    382 
    383     if (CachedBitVarChanged) {
    384       Init *Bit = CurBitVar->getBit(CurBit->getBitNum());
    385       NewBits[i] = fixBitInit(RV, CurBit, Bit);
    386     }
    387   }
    388 
    389   if (Changed)
    390     return BitsInit::get(NewBits);
    391 
    392   return const_cast<BitsInit *>(this);
    393 }
    394 
    395 IntInit *IntInit::get(int64_t V) {
    396   static DenseMap<int64_t, std::unique_ptr<IntInit>> ThePool;
    397 
    398   std::unique_ptr<IntInit> &I = ThePool[V];
    399   if (!I) I.reset(new IntInit(V));
    400   return I.get();
    401 }
    402 
    403 std::string IntInit::getAsString() const {
    404   return itostr(Value);
    405 }
    406 
    407 static bool canFitInBitfield(int64_t Value, unsigned NumBits) {
    408   // For example, with NumBits == 4, we permit Values from [-7 .. 15].
    409   return (NumBits >= sizeof(Value) * 8) ||
    410          (Value >> NumBits == 0) || (Value >> (NumBits-1) == -1);
    411 }
    412 
    413 Init *IntInit::convertInitializerTo(RecTy *Ty) const {
    414   if (isa<IntRecTy>(Ty))
    415     return const_cast<IntInit *>(this);
    416 
    417   if (isa<BitRecTy>(Ty)) {
    418     int64_t Val = getValue();
    419     if (Val != 0 && Val != 1) return nullptr;  // Only accept 0 or 1 for a bit!
    420     return BitInit::get(Val != 0);
    421   }
    422 
    423   if (auto *BRT = dyn_cast<BitsRecTy>(Ty)) {
    424     int64_t Value = getValue();
    425     // Make sure this bitfield is large enough to hold the integer value.
    426     if (!canFitInBitfield(Value, BRT->getNumBits()))
    427       return nullptr;
    428 
    429     SmallVector<Init *, 16> NewBits(BRT->getNumBits());
    430     for (unsigned i = 0; i != BRT->getNumBits(); ++i)
    431       NewBits[i] = BitInit::get(Value & (1LL << i));
    432 
    433     return BitsInit::get(NewBits);
    434   }
    435 
    436   return nullptr;
    437 }
    438 
    439 Init *
    440 IntInit::convertInitializerBitRange(const std::vector<unsigned> &Bits) const {
    441   SmallVector<Init *, 16> NewBits(Bits.size());
    442 
    443   for (unsigned i = 0, e = Bits.size(); i != e; ++i) {
    444     if (Bits[i] >= 64)
    445       return nullptr;
    446 
    447     NewBits[i] = BitInit::get(Value & (INT64_C(1) << Bits[i]));
    448   }
    449   return BitsInit::get(NewBits);
    450 }
    451 
    452 CodeInit *CodeInit::get(StringRef V) {
    453   static StringMap<std::unique_ptr<CodeInit>> ThePool;
    454 
    455   std::unique_ptr<CodeInit> &I = ThePool[V];
    456   if (!I) I.reset(new CodeInit(V));
    457   return I.get();
    458 }
    459 
    460 StringInit *StringInit::get(StringRef V) {
    461   static StringMap<std::unique_ptr<StringInit>> ThePool;
    462 
    463   std::unique_ptr<StringInit> &I = ThePool[V];
    464   if (!I) I.reset(new StringInit(V));
    465   return I.get();
    466 }
    467 
    468 Init *StringInit::convertInitializerTo(RecTy *Ty) const {
    469   if (isa<StringRecTy>(Ty))
    470     return const_cast<StringInit *>(this);
    471 
    472   return nullptr;
    473 }
    474 
    475 Init *CodeInit::convertInitializerTo(RecTy *Ty) const {
    476   if (isa<CodeRecTy>(Ty))
    477     return const_cast<CodeInit *>(this);
    478 
    479   return nullptr;
    480 }
    481 
    482 static void ProfileListInit(FoldingSetNodeID &ID,
    483                             ArrayRef<Init *> Range,
    484                             RecTy *EltTy) {
    485   ID.AddInteger(Range.size());
    486   ID.AddPointer(EltTy);
    487 
    488   for (Init *I : Range)
    489     ID.AddPointer(I);
    490 }
    491 
    492 ListInit *ListInit::get(ArrayRef<Init *> Range, RecTy *EltTy) {
    493   static FoldingSet<ListInit> ThePool;
    494   static std::vector<std::unique_ptr<ListInit>> TheActualPool;
    495 
    496   FoldingSetNodeID ID;
    497   ProfileListInit(ID, Range, EltTy);
    498 
    499   void *IP = nullptr;
    500   if (ListInit *I = ThePool.FindNodeOrInsertPos(ID, IP))
    501     return I;
    502 
    503   void *Mem = ::operator new (totalSizeToAlloc<Init *>(Range.size()));
    504   ListInit *I = new (Mem) ListInit(Range.size(), EltTy);
    505   std::uninitialized_copy(Range.begin(), Range.end(),
    506                           I->getTrailingObjects<Init *>());
    507   ThePool.InsertNode(I, IP);
    508   TheActualPool.push_back(std::unique_ptr<ListInit>(I));
    509   return I;
    510 }
    511 
    512 void ListInit::Profile(FoldingSetNodeID &ID) const {
    513   RecTy *EltTy = cast<ListRecTy>(getType())->getElementType();
    514 
    515   ProfileListInit(ID, getValues(), EltTy);
    516 }
    517 
    518 Init *ListInit::convertInitializerTo(RecTy *Ty) const {
    519   if (auto *LRT = dyn_cast<ListRecTy>(Ty)) {
    520     std::vector<Init*> Elements;
    521 
    522     // Verify that all of the elements of the list are subclasses of the
    523     // appropriate class!
    524     for (Init *I : getValues())
    525       if (Init *CI = I->convertInitializerTo(LRT->getElementType()))
    526         Elements.push_back(CI);
    527       else
    528         return nullptr;
    529 
    530     if (isa<ListRecTy>(getType()))
    531       return ListInit::get(Elements, Ty);
    532   }
    533 
    534   return nullptr;
    535 }
    536 
    537 Init *
    538 ListInit::convertInitListSlice(const std::vector<unsigned> &Elements) const {
    539   std::vector<Init*> Vals;
    540   for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
    541     if (Elements[i] >= size())
    542       return nullptr;
    543     Vals.push_back(getElement(Elements[i]));
    544   }
    545   return ListInit::get(Vals, getType());
    546 }
    547 
    548 Record *ListInit::getElementAsRecord(unsigned i) const {
    549   assert(i < NumValues && "List element index out of range!");
    550   DefInit *DI = dyn_cast<DefInit>(getElement(i));
    551   if (!DI)
    552     PrintFatalError("Expected record in list!");
    553   return DI->getDef();
    554 }
    555 
    556 Init *ListInit::resolveReferences(Record &R, const RecordVal *RV) const {
    557   std::vector<Init*> Resolved;
    558   Resolved.reserve(size());
    559   bool Changed = false;
    560 
    561   for (Init *CurElt : getValues()) {
    562     Init *E;
    563 
    564     do {
    565       E = CurElt;
    566       CurElt = CurElt->resolveReferences(R, RV);
    567       Changed |= E != CurElt;
    568     } while (E != CurElt);
    569     Resolved.push_back(E);
    570   }
    571 
    572   if (Changed)
    573     return ListInit::get(Resolved, getType());
    574   return const_cast<ListInit *>(this);
    575 }
    576 
    577 Init *ListInit::resolveListElementReference(Record &R, const RecordVal *IRV,
    578                                             unsigned Elt) const {
    579   if (Elt >= size())
    580     return nullptr;  // Out of range reference.
    581   Init *E = getElement(Elt);
    582   // If the element is set to some value, or if we are resolving a reference
    583   // to a specific variable and that variable is explicitly unset, then
    584   // replace the VarListElementInit with it.
    585   if (IRV || !isa<UnsetInit>(E))
    586     return E;
    587   return nullptr;
    588 }
    589 
    590 std::string ListInit::getAsString() const {
    591   std::string Result = "[";
    592   for (unsigned i = 0, e = NumValues; i != e; ++i) {
    593     if (i) Result += ", ";
    594     Result += getElement(i)->getAsString();
    595   }
    596   return Result + "]";
    597 }
    598 
    599 Init *OpInit::resolveListElementReference(Record &R, const RecordVal *IRV,
    600                                           unsigned Elt) const {
    601   Init *Resolved = resolveReferences(R, IRV);
    602   OpInit *OResolved = dyn_cast<OpInit>(Resolved);
    603   if (OResolved) {
    604     Resolved = OResolved->Fold(&R, nullptr);
    605   }
    606 
    607   if (Resolved != this) {
    608     TypedInit *Typed = cast<TypedInit>(Resolved);
    609     if (Init *New = Typed->resolveListElementReference(R, IRV, Elt))
    610       return New;
    611     return VarListElementInit::get(Typed, Elt);
    612   }
    613 
    614   return nullptr;
    615 }
    616 
    617 Init *OpInit::getBit(unsigned Bit) const {
    618   if (getType() == BitRecTy::get())
    619     return const_cast<OpInit*>(this);
    620   return VarBitInit::get(const_cast<OpInit*>(this), Bit);
    621 }
    622 
    623 static void
    624 ProfileUnOpInit(FoldingSetNodeID &ID, unsigned Opcode, Init *Op, RecTy *Type) {
    625   ID.AddInteger(Opcode);
    626   ID.AddPointer(Op);
    627   ID.AddPointer(Type);
    628 }
    629 
    630 UnOpInit *UnOpInit::get(UnaryOp Opc, Init *LHS, RecTy *Type) {
    631   static FoldingSet<UnOpInit> ThePool;
    632   static std::vector<std::unique_ptr<UnOpInit>> TheActualPool;
    633 
    634   FoldingSetNodeID ID;
    635   ProfileUnOpInit(ID, Opc, LHS, Type);
    636 
    637   void *IP = nullptr;
    638   if (UnOpInit *I = ThePool.FindNodeOrInsertPos(ID, IP))
    639     return I;
    640 
    641   UnOpInit *I = new UnOpInit(Opc, LHS, Type);
    642   ThePool.InsertNode(I, IP);
    643   TheActualPool.push_back(std::unique_ptr<UnOpInit>(I));
    644   return I;
    645 }
    646 
    647 void UnOpInit::Profile(FoldingSetNodeID &ID) const {
    648   ProfileUnOpInit(ID, getOpcode(), getOperand(), getType());
    649 }
    650 
    651 Init *UnOpInit::Fold(Record *CurRec, MultiClass *CurMultiClass) const {
    652   switch (getOpcode()) {
    653   case CAST: {
    654     if (isa<StringRecTy>(getType())) {
    655       if (StringInit *LHSs = dyn_cast<StringInit>(LHS))
    656         return LHSs;
    657 
    658       if (DefInit *LHSd = dyn_cast<DefInit>(LHS))
    659         return StringInit::get(LHSd->getAsString());
    660 
    661       if (IntInit *LHSi = dyn_cast<IntInit>(LHS))
    662         return StringInit::get(LHSi->getAsString());
    663     } else {
    664       if (StringInit *LHSs = dyn_cast<StringInit>(LHS)) {
    665         const std::string &Name = LHSs->getValue();
    666 
    667         // From TGParser::ParseIDValue
    668         if (CurRec) {
    669           if (const RecordVal *RV = CurRec->getValue(Name)) {
    670             if (RV->getType() != getType())
    671               PrintFatalError("type mismatch in cast");
    672             return VarInit::get(Name, RV->getType());
    673           }
    674 
    675           Init *TemplateArgName = QualifyName(*CurRec, CurMultiClass, Name,
    676                                               ":");
    677 
    678           if (CurRec->isTemplateArg(TemplateArgName)) {
    679             const RecordVal *RV = CurRec->getValue(TemplateArgName);
    680             assert(RV && "Template arg doesn't exist??");
    681 
    682             if (RV->getType() != getType())
    683               PrintFatalError("type mismatch in cast");
    684 
    685             return VarInit::get(TemplateArgName, RV->getType());
    686           }
    687         }
    688 
    689         if (CurMultiClass) {
    690           Init *MCName = QualifyName(CurMultiClass->Rec, CurMultiClass, Name,
    691                                      "::");
    692 
    693           if (CurMultiClass->Rec.isTemplateArg(MCName)) {
    694             const RecordVal *RV = CurMultiClass->Rec.getValue(MCName);
    695             assert(RV && "Template arg doesn't exist??");
    696 
    697             if (RV->getType() != getType())
    698               PrintFatalError("type mismatch in cast");
    699 
    700             return VarInit::get(MCName, RV->getType());
    701           }
    702         }
    703         assert(CurRec && "NULL pointer");
    704         if (Record *D = (CurRec->getRecords()).getDef(Name))
    705           return DefInit::get(D);
    706 
    707         PrintFatalError(CurRec->getLoc(),
    708                         "Undefined reference:'" + Name + "'\n");
    709       }
    710 
    711       if (isa<IntRecTy>(getType())) {
    712         if (BitsInit *BI = dyn_cast<BitsInit>(LHS)) {
    713           if (Init *NewInit = BI->convertInitializerTo(IntRecTy::get()))
    714             return NewInit;
    715           break;
    716         }
    717       }
    718     }
    719     break;
    720   }
    721   case HEAD: {
    722     if (ListInit *LHSl = dyn_cast<ListInit>(LHS)) {
    723       assert(!LHSl->empty() && "Empty list in head");
    724       return LHSl->getElement(0);
    725     }
    726     break;
    727   }
    728   case TAIL: {
    729     if (ListInit *LHSl = dyn_cast<ListInit>(LHS)) {
    730       assert(!LHSl->empty() && "Empty list in tail");
    731       // Note the +1.  We can't just pass the result of getValues()
    732       // directly.
    733       return ListInit::get(LHSl->getValues().slice(1), LHSl->getType());
    734     }
    735     break;
    736   }
    737   case EMPTY: {
    738     if (ListInit *LHSl = dyn_cast<ListInit>(LHS))
    739       return IntInit::get(LHSl->empty());
    740     if (StringInit *LHSs = dyn_cast<StringInit>(LHS))
    741       return IntInit::get(LHSs->getValue().empty());
    742 
    743     break;
    744   }
    745   }
    746   return const_cast<UnOpInit *>(this);
    747 }
    748 
    749 Init *UnOpInit::resolveReferences(Record &R, const RecordVal *RV) const {
    750   Init *lhs = LHS->resolveReferences(R, RV);
    751 
    752   if (LHS != lhs)
    753     return (UnOpInit::get(getOpcode(), lhs, getType()))->Fold(&R, nullptr);
    754   return Fold(&R, nullptr);
    755 }
    756 
    757 std::string UnOpInit::getAsString() const {
    758   std::string Result;
    759   switch (getOpcode()) {
    760   case CAST: Result = "!cast<" + getType()->getAsString() + ">"; break;
    761   case HEAD: Result = "!head"; break;
    762   case TAIL: Result = "!tail"; break;
    763   case EMPTY: Result = "!empty"; break;
    764   }
    765   return Result + "(" + LHS->getAsString() + ")";
    766 }
    767 
    768 static void
    769 ProfileBinOpInit(FoldingSetNodeID &ID, unsigned Opcode, Init *LHS, Init *RHS,
    770                  RecTy *Type) {
    771   ID.AddInteger(Opcode);
    772   ID.AddPointer(LHS);
    773   ID.AddPointer(RHS);
    774   ID.AddPointer(Type);
    775 }
    776 
    777 BinOpInit *BinOpInit::get(BinaryOp Opc, Init *LHS,
    778                           Init *RHS, RecTy *Type) {
    779   static FoldingSet<BinOpInit> ThePool;
    780   static std::vector<std::unique_ptr<BinOpInit>> TheActualPool;
    781 
    782   FoldingSetNodeID ID;
    783   ProfileBinOpInit(ID, Opc, LHS, RHS, Type);
    784 
    785   void *IP = nullptr;
    786   if (BinOpInit *I = ThePool.FindNodeOrInsertPos(ID, IP))
    787     return I;
    788 
    789   BinOpInit *I = new BinOpInit(Opc, LHS, RHS, Type);
    790   ThePool.InsertNode(I, IP);
    791   TheActualPool.push_back(std::unique_ptr<BinOpInit>(I));
    792   return I;
    793 }
    794 
    795 void BinOpInit::Profile(FoldingSetNodeID &ID) const {
    796   ProfileBinOpInit(ID, getOpcode(), getLHS(), getRHS(), getType());
    797 }
    798 
    799 Init *BinOpInit::Fold(Record *CurRec, MultiClass *CurMultiClass) const {
    800   switch (getOpcode()) {
    801   case CONCAT: {
    802     DagInit *LHSs = dyn_cast<DagInit>(LHS);
    803     DagInit *RHSs = dyn_cast<DagInit>(RHS);
    804     if (LHSs && RHSs) {
    805       DefInit *LOp = dyn_cast<DefInit>(LHSs->getOperator());
    806       DefInit *ROp = dyn_cast<DefInit>(RHSs->getOperator());
    807       if (!LOp || !ROp || LOp->getDef() != ROp->getDef())
    808         PrintFatalError("Concated Dag operators do not match!");
    809       std::vector<Init*> Args;
    810       std::vector<std::string> ArgNames;
    811       for (unsigned i = 0, e = LHSs->getNumArgs(); i != e; ++i) {
    812         Args.push_back(LHSs->getArg(i));
    813         ArgNames.push_back(LHSs->getArgName(i));
    814       }
    815       for (unsigned i = 0, e = RHSs->getNumArgs(); i != e; ++i) {
    816         Args.push_back(RHSs->getArg(i));
    817         ArgNames.push_back(RHSs->getArgName(i));
    818       }
    819       return DagInit::get(LHSs->getOperator(), "", Args, ArgNames);
    820     }
    821     break;
    822   }
    823   case LISTCONCAT: {
    824     ListInit *LHSs = dyn_cast<ListInit>(LHS);
    825     ListInit *RHSs = dyn_cast<ListInit>(RHS);
    826     if (LHSs && RHSs) {
    827       std::vector<Init *> Args;
    828       Args.insert(Args.end(), LHSs->begin(), LHSs->end());
    829       Args.insert(Args.end(), RHSs->begin(), RHSs->end());
    830       return ListInit::get(
    831           Args, cast<ListRecTy>(LHSs->getType())->getElementType());
    832     }
    833     break;
    834   }
    835   case STRCONCAT: {
    836     StringInit *LHSs = dyn_cast<StringInit>(LHS);
    837     StringInit *RHSs = dyn_cast<StringInit>(RHS);
    838     if (LHSs && RHSs)
    839       return StringInit::get(LHSs->getValue() + RHSs->getValue());
    840     break;
    841   }
    842   case EQ: {
    843     // try to fold eq comparison for 'bit' and 'int', otherwise fallback
    844     // to string objects.
    845     IntInit *L =
    846       dyn_cast_or_null<IntInit>(LHS->convertInitializerTo(IntRecTy::get()));
    847     IntInit *R =
    848       dyn_cast_or_null<IntInit>(RHS->convertInitializerTo(IntRecTy::get()));
    849 
    850     if (L && R)
    851       return IntInit::get(L->getValue() == R->getValue());
    852 
    853     StringInit *LHSs = dyn_cast<StringInit>(LHS);
    854     StringInit *RHSs = dyn_cast<StringInit>(RHS);
    855 
    856     // Make sure we've resolved
    857     if (LHSs && RHSs)
    858       return IntInit::get(LHSs->getValue() == RHSs->getValue());
    859 
    860     break;
    861   }
    862   case ADD:
    863   case AND:
    864   case SHL:
    865   case SRA:
    866   case SRL: {
    867     IntInit *LHSi =
    868       dyn_cast_or_null<IntInit>(LHS->convertInitializerTo(IntRecTy::get()));
    869     IntInit *RHSi =
    870       dyn_cast_or_null<IntInit>(RHS->convertInitializerTo(IntRecTy::get()));
    871     if (LHSi && RHSi) {
    872       int64_t LHSv = LHSi->getValue(), RHSv = RHSi->getValue();
    873       int64_t Result;
    874       switch (getOpcode()) {
    875       default: llvm_unreachable("Bad opcode!");
    876       case ADD: Result = LHSv +  RHSv; break;
    877       case AND: Result = LHSv &  RHSv; break;
    878       case SHL: Result = LHSv << RHSv; break;
    879       case SRA: Result = LHSv >> RHSv; break;
    880       case SRL: Result = (uint64_t)LHSv >> (uint64_t)RHSv; break;
    881       }
    882       return IntInit::get(Result);
    883     }
    884     break;
    885   }
    886   }
    887   return const_cast<BinOpInit *>(this);
    888 }
    889 
    890 Init *BinOpInit::resolveReferences(Record &R, const RecordVal *RV) const {
    891   Init *lhs = LHS->resolveReferences(R, RV);
    892   Init *rhs = RHS->resolveReferences(R, RV);
    893 
    894   if (LHS != lhs || RHS != rhs)
    895     return (BinOpInit::get(getOpcode(), lhs, rhs, getType()))->Fold(&R,nullptr);
    896   return Fold(&R, nullptr);
    897 }
    898 
    899 std::string BinOpInit::getAsString() const {
    900   std::string Result;
    901   switch (getOpcode()) {
    902   case CONCAT: Result = "!con"; break;
    903   case ADD: Result = "!add"; break;
    904   case AND: Result = "!and"; break;
    905   case SHL: Result = "!shl"; break;
    906   case SRA: Result = "!sra"; break;
    907   case SRL: Result = "!srl"; break;
    908   case EQ: Result = "!eq"; break;
    909   case LISTCONCAT: Result = "!listconcat"; break;
    910   case STRCONCAT: Result = "!strconcat"; break;
    911   }
    912   return Result + "(" + LHS->getAsString() + ", " + RHS->getAsString() + ")";
    913 }
    914 
    915 static void
    916 ProfileTernOpInit(FoldingSetNodeID &ID, unsigned Opcode, Init *LHS, Init *MHS,
    917                   Init *RHS, RecTy *Type) {
    918   ID.AddInteger(Opcode);
    919   ID.AddPointer(LHS);
    920   ID.AddPointer(MHS);
    921   ID.AddPointer(RHS);
    922   ID.AddPointer(Type);
    923 }
    924 
    925 TernOpInit *TernOpInit::get(TernaryOp Opc, Init *LHS, Init *MHS, Init *RHS,
    926                             RecTy *Type) {
    927   static FoldingSet<TernOpInit> ThePool;
    928   static std::vector<std::unique_ptr<TernOpInit>> TheActualPool;
    929 
    930   FoldingSetNodeID ID;
    931   ProfileTernOpInit(ID, Opc, LHS, MHS, RHS, Type);
    932 
    933   void *IP = nullptr;
    934   if (TernOpInit *I = ThePool.FindNodeOrInsertPos(ID, IP))
    935     return I;
    936 
    937   TernOpInit *I = new TernOpInit(Opc, LHS, MHS, RHS, Type);
    938   ThePool.InsertNode(I, IP);
    939   TheActualPool.push_back(std::unique_ptr<TernOpInit>(I));
    940   return I;
    941 }
    942 
    943 void TernOpInit::Profile(FoldingSetNodeID &ID) const {
    944   ProfileTernOpInit(ID, getOpcode(), getLHS(), getMHS(), getRHS(), getType());
    945 }
    946 
    947 static Init *ForeachHelper(Init *LHS, Init *MHS, Init *RHS, RecTy *Type,
    948                            Record *CurRec, MultiClass *CurMultiClass);
    949 
    950 static Init *EvaluateOperation(OpInit *RHSo, Init *LHS, Init *Arg,
    951                                RecTy *Type, Record *CurRec,
    952                                MultiClass *CurMultiClass) {
    953   // If this is a dag, recurse
    954   if (auto *TArg = dyn_cast<TypedInit>(Arg))
    955     if (isa<DagRecTy>(TArg->getType()))
    956       return ForeachHelper(LHS, Arg, RHSo, Type, CurRec, CurMultiClass);
    957 
    958   std::vector<Init *> NewOperands;
    959   for (unsigned i = 0; i < RHSo->getNumOperands(); ++i) {
    960     if (auto *RHSoo = dyn_cast<OpInit>(RHSo->getOperand(i))) {
    961       if (Init *Result = EvaluateOperation(RHSoo, LHS, Arg,
    962                                            Type, CurRec, CurMultiClass))
    963         NewOperands.push_back(Result);
    964       else
    965         NewOperands.push_back(Arg);
    966     } else if (LHS->getAsString() == RHSo->getOperand(i)->getAsString()) {
    967       NewOperands.push_back(Arg);
    968     } else {
    969       NewOperands.push_back(RHSo->getOperand(i));
    970     }
    971   }
    972 
    973   // Now run the operator and use its result as the new leaf
    974   const OpInit *NewOp = RHSo->clone(NewOperands);
    975   Init *NewVal = NewOp->Fold(CurRec, CurMultiClass);
    976   return (NewVal != NewOp) ? NewVal : nullptr;
    977 }
    978 
    979 static Init *ForeachHelper(Init *LHS, Init *MHS, Init *RHS, RecTy *Type,
    980                            Record *CurRec, MultiClass *CurMultiClass) {
    981 
    982   OpInit *RHSo = dyn_cast<OpInit>(RHS);
    983 
    984   if (!RHSo)
    985     PrintFatalError(CurRec->getLoc(), "!foreach requires an operator\n");
    986 
    987   TypedInit *LHSt = dyn_cast<TypedInit>(LHS);
    988 
    989   if (!LHSt)
    990     PrintFatalError(CurRec->getLoc(), "!foreach requires typed variable\n");
    991 
    992   DagInit *MHSd = dyn_cast<DagInit>(MHS);
    993   if (MHSd && isa<DagRecTy>(Type)) {
    994     Init *Val = MHSd->getOperator();
    995     if (Init *Result = EvaluateOperation(RHSo, LHS, Val,
    996                                          Type, CurRec, CurMultiClass))
    997       Val = Result;
    998 
    999     std::vector<std::pair<Init *, std::string> > args;
   1000     for (unsigned int i = 0; i < MHSd->getNumArgs(); ++i) {
   1001       Init *Arg = MHSd->getArg(i);
   1002       std::string ArgName = MHSd->getArgName(i);
   1003 
   1004       // Process args
   1005       if (Init *Result = EvaluateOperation(RHSo, LHS, Arg, Type,
   1006                                            CurRec, CurMultiClass))
   1007         Arg = Result;
   1008 
   1009       // TODO: Process arg names
   1010       args.push_back(std::make_pair(Arg, ArgName));
   1011     }
   1012 
   1013     return DagInit::get(Val, "", args);
   1014   }
   1015 
   1016   ListInit *MHSl = dyn_cast<ListInit>(MHS);
   1017   if (MHSl && isa<ListRecTy>(Type)) {
   1018     std::vector<Init *> NewOperands;
   1019     std::vector<Init *> NewList(MHSl->begin(), MHSl->end());
   1020 
   1021     for (Init *&Item : NewList) {
   1022       NewOperands.clear();
   1023       for(unsigned i = 0; i < RHSo->getNumOperands(); ++i) {
   1024         // First, replace the foreach variable with the list item
   1025         if (LHS->getAsString() == RHSo->getOperand(i)->getAsString())
   1026           NewOperands.push_back(Item);
   1027         else
   1028           NewOperands.push_back(RHSo->getOperand(i));
   1029       }
   1030 
   1031       // Now run the operator and use its result as the new list item
   1032       const OpInit *NewOp = RHSo->clone(NewOperands);
   1033       Init *NewItem = NewOp->Fold(CurRec, CurMultiClass);
   1034       if (NewItem != NewOp)
   1035         Item = NewItem;
   1036     }
   1037     return ListInit::get(NewList, MHSl->getType());
   1038   }
   1039   return nullptr;
   1040 }
   1041 
   1042 Init *TernOpInit::Fold(Record *CurRec, MultiClass *CurMultiClass) const {
   1043   switch (getOpcode()) {
   1044   case SUBST: {
   1045     DefInit *LHSd = dyn_cast<DefInit>(LHS);
   1046     VarInit *LHSv = dyn_cast<VarInit>(LHS);
   1047     StringInit *LHSs = dyn_cast<StringInit>(LHS);
   1048 
   1049     DefInit *MHSd = dyn_cast<DefInit>(MHS);
   1050     VarInit *MHSv = dyn_cast<VarInit>(MHS);
   1051     StringInit *MHSs = dyn_cast<StringInit>(MHS);
   1052 
   1053     DefInit *RHSd = dyn_cast<DefInit>(RHS);
   1054     VarInit *RHSv = dyn_cast<VarInit>(RHS);
   1055     StringInit *RHSs = dyn_cast<StringInit>(RHS);
   1056 
   1057     if (LHSd && MHSd && RHSd) {
   1058       Record *Val = RHSd->getDef();
   1059       if (LHSd->getAsString() == RHSd->getAsString())
   1060         Val = MHSd->getDef();
   1061       return DefInit::get(Val);
   1062     }
   1063     if (LHSv && MHSv && RHSv) {
   1064       std::string Val = RHSv->getName();
   1065       if (LHSv->getAsString() == RHSv->getAsString())
   1066         Val = MHSv->getName();
   1067       return VarInit::get(Val, getType());
   1068     }
   1069     if (LHSs && MHSs && RHSs) {
   1070       std::string Val = RHSs->getValue();
   1071 
   1072       std::string::size_type found;
   1073       std::string::size_type idx = 0;
   1074       while (true) {
   1075         found = Val.find(LHSs->getValue(), idx);
   1076         if (found == std::string::npos)
   1077           break;
   1078         Val.replace(found, LHSs->getValue().size(), MHSs->getValue());
   1079         idx = found + MHSs->getValue().size();
   1080       }
   1081 
   1082       return StringInit::get(Val);
   1083     }
   1084     break;
   1085   }
   1086 
   1087   case FOREACH: {
   1088     if (Init *Result = ForeachHelper(LHS, MHS, RHS, getType(),
   1089                                      CurRec, CurMultiClass))
   1090       return Result;
   1091     break;
   1092   }
   1093 
   1094   case IF: {
   1095     IntInit *LHSi = dyn_cast<IntInit>(LHS);
   1096     if (Init *I = LHS->convertInitializerTo(IntRecTy::get()))
   1097       LHSi = dyn_cast<IntInit>(I);
   1098     if (LHSi) {
   1099       if (LHSi->getValue())
   1100         return MHS;
   1101       return RHS;
   1102     }
   1103     break;
   1104   }
   1105   }
   1106 
   1107   return const_cast<TernOpInit *>(this);
   1108 }
   1109 
   1110 Init *TernOpInit::resolveReferences(Record &R,
   1111                                     const RecordVal *RV) const {
   1112   Init *lhs = LHS->resolveReferences(R, RV);
   1113 
   1114   if (getOpcode() == IF && lhs != LHS) {
   1115     IntInit *Value = dyn_cast<IntInit>(lhs);
   1116     if (Init *I = lhs->convertInitializerTo(IntRecTy::get()))
   1117       Value = dyn_cast<IntInit>(I);
   1118     if (Value) {
   1119       // Short-circuit
   1120       if (Value->getValue()) {
   1121         Init *mhs = MHS->resolveReferences(R, RV);
   1122         return (TernOpInit::get(getOpcode(), lhs, mhs,
   1123                                 RHS, getType()))->Fold(&R, nullptr);
   1124       }
   1125       Init *rhs = RHS->resolveReferences(R, RV);
   1126       return (TernOpInit::get(getOpcode(), lhs, MHS,
   1127                               rhs, getType()))->Fold(&R, nullptr);
   1128     }
   1129   }
   1130 
   1131   Init *mhs = MHS->resolveReferences(R, RV);
   1132   Init *rhs = RHS->resolveReferences(R, RV);
   1133 
   1134   if (LHS != lhs || MHS != mhs || RHS != rhs)
   1135     return (TernOpInit::get(getOpcode(), lhs, mhs, rhs,
   1136                             getType()))->Fold(&R, nullptr);
   1137   return Fold(&R, nullptr);
   1138 }
   1139 
   1140 std::string TernOpInit::getAsString() const {
   1141   std::string Result;
   1142   switch (getOpcode()) {
   1143   case SUBST: Result = "!subst"; break;
   1144   case FOREACH: Result = "!foreach"; break;
   1145   case IF: Result = "!if"; break;
   1146   }
   1147   return Result + "(" + LHS->getAsString() + ", " + MHS->getAsString() + ", " +
   1148          RHS->getAsString() + ")";
   1149 }
   1150 
   1151 RecTy *TypedInit::getFieldType(const std::string &FieldName) const {
   1152   if (RecordRecTy *RecordType = dyn_cast<RecordRecTy>(getType()))
   1153     if (RecordVal *Field = RecordType->getRecord()->getValue(FieldName))
   1154       return Field->getType();
   1155   return nullptr;
   1156 }
   1157 
   1158 Init *
   1159 TypedInit::convertInitializerTo(RecTy *Ty) const {
   1160   if (isa<IntRecTy>(Ty)) {
   1161     if (getType()->typeIsConvertibleTo(Ty))
   1162       return const_cast<TypedInit *>(this);
   1163     return nullptr;
   1164   }
   1165 
   1166   if (isa<StringRecTy>(Ty)) {
   1167     if (isa<StringRecTy>(getType()))
   1168       return const_cast<TypedInit *>(this);
   1169     return nullptr;
   1170   }
   1171 
   1172   if (isa<CodeRecTy>(Ty)) {
   1173     if (isa<CodeRecTy>(getType()))
   1174       return const_cast<TypedInit *>(this);
   1175     return nullptr;
   1176   }
   1177 
   1178   if (isa<BitRecTy>(Ty)) {
   1179     // Accept variable if it is already of bit type!
   1180     if (isa<BitRecTy>(getType()))
   1181       return const_cast<TypedInit *>(this);
   1182     if (auto *BitsTy = dyn_cast<BitsRecTy>(getType())) {
   1183       // Accept only bits<1> expression.
   1184       if (BitsTy->getNumBits() == 1)
   1185         return const_cast<TypedInit *>(this);
   1186       return nullptr;
   1187     }
   1188     // Ternary !if can be converted to bit, but only if both sides are
   1189     // convertible to a bit.
   1190     if (const auto *TOI = dyn_cast<TernOpInit>(this)) {
   1191       if (TOI->getOpcode() == TernOpInit::TernaryOp::IF &&
   1192           TOI->getMHS()->convertInitializerTo(BitRecTy::get()) &&
   1193           TOI->getRHS()->convertInitializerTo(BitRecTy::get()))
   1194         return const_cast<TypedInit *>(this);
   1195       return nullptr;
   1196     }
   1197     return nullptr;
   1198   }
   1199 
   1200   if (auto *BRT = dyn_cast<BitsRecTy>(Ty)) {
   1201     if (BRT->getNumBits() == 1 && isa<BitRecTy>(getType()))
   1202       return BitsInit::get(const_cast<TypedInit *>(this));
   1203 
   1204     if (getType()->typeIsConvertibleTo(BRT)) {
   1205       SmallVector<Init *, 16> NewBits(BRT->getNumBits());
   1206 
   1207       for (unsigned i = 0; i != BRT->getNumBits(); ++i)
   1208         NewBits[i] = VarBitInit::get(const_cast<TypedInit *>(this), i);
   1209       return BitsInit::get(NewBits);
   1210     }
   1211 
   1212     return nullptr;
   1213   }
   1214 
   1215   if (auto *DLRT = dyn_cast<ListRecTy>(Ty)) {
   1216     if (auto *SLRT = dyn_cast<ListRecTy>(getType()))
   1217       if (SLRT->getElementType()->typeIsConvertibleTo(DLRT->getElementType()))
   1218         return const_cast<TypedInit *>(this);
   1219     return nullptr;
   1220   }
   1221 
   1222   if (auto *DRT = dyn_cast<DagRecTy>(Ty)) {
   1223     if (getType()->typeIsConvertibleTo(DRT))
   1224       return const_cast<TypedInit *>(this);
   1225     return nullptr;
   1226   }
   1227 
   1228   if (auto *SRRT = dyn_cast<RecordRecTy>(Ty)) {
   1229     // Ensure that this is compatible with Rec.
   1230     if (RecordRecTy *DRRT = dyn_cast<RecordRecTy>(getType()))
   1231       if (DRRT->getRecord()->isSubClassOf(SRRT->getRecord()) ||
   1232           DRRT->getRecord() == SRRT->getRecord())
   1233         return const_cast<TypedInit *>(this);
   1234     return nullptr;
   1235   }
   1236 
   1237   return nullptr;
   1238 }
   1239 
   1240 Init *
   1241 TypedInit::convertInitializerBitRange(const std::vector<unsigned> &Bits) const {
   1242   BitsRecTy *T = dyn_cast<BitsRecTy>(getType());
   1243   if (!T) return nullptr;  // Cannot subscript a non-bits variable.
   1244   unsigned NumBits = T->getNumBits();
   1245 
   1246   SmallVector<Init *, 16> NewBits(Bits.size());
   1247   for (unsigned i = 0, e = Bits.size(); i != e; ++i) {
   1248     if (Bits[i] >= NumBits)
   1249       return nullptr;
   1250 
   1251     NewBits[i] = VarBitInit::get(const_cast<TypedInit *>(this), Bits[i]);
   1252   }
   1253   return BitsInit::get(NewBits);
   1254 }
   1255 
   1256 Init *
   1257 TypedInit::convertInitListSlice(const std::vector<unsigned> &Elements) const {
   1258   ListRecTy *T = dyn_cast<ListRecTy>(getType());
   1259   if (!T) return nullptr;  // Cannot subscript a non-list variable.
   1260 
   1261   if (Elements.size() == 1)
   1262     return VarListElementInit::get(const_cast<TypedInit *>(this), Elements[0]);
   1263 
   1264   std::vector<Init*> ListInits;
   1265   ListInits.reserve(Elements.size());
   1266   for (unsigned i = 0, e = Elements.size(); i != e; ++i)
   1267     ListInits.push_back(VarListElementInit::get(const_cast<TypedInit *>(this),
   1268                                                 Elements[i]));
   1269   return ListInit::get(ListInits, T);
   1270 }
   1271 
   1272 
   1273 VarInit *VarInit::get(const std::string &VN, RecTy *T) {
   1274   Init *Value = StringInit::get(VN);
   1275   return VarInit::get(Value, T);
   1276 }
   1277 
   1278 VarInit *VarInit::get(Init *VN, RecTy *T) {
   1279   typedef std::pair<RecTy *, Init *> Key;
   1280   static DenseMap<Key, std::unique_ptr<VarInit>> ThePool;
   1281 
   1282   Key TheKey(std::make_pair(T, VN));
   1283 
   1284   std::unique_ptr<VarInit> &I = ThePool[TheKey];
   1285   if (!I) I.reset(new VarInit(VN, T));
   1286   return I.get();
   1287 }
   1288 
   1289 const std::string &VarInit::getName() const {
   1290   StringInit *NameString = cast<StringInit>(getNameInit());
   1291   return NameString->getValue();
   1292 }
   1293 
   1294 Init *VarInit::getBit(unsigned Bit) const {
   1295   if (getType() == BitRecTy::get())
   1296     return const_cast<VarInit*>(this);
   1297   return VarBitInit::get(const_cast<VarInit*>(this), Bit);
   1298 }
   1299 
   1300 Init *VarInit::resolveListElementReference(Record &R,
   1301                                            const RecordVal *IRV,
   1302                                            unsigned Elt) const {
   1303   if (R.isTemplateArg(getNameInit())) return nullptr;
   1304   if (IRV && IRV->getNameInit() != getNameInit()) return nullptr;
   1305 
   1306   RecordVal *RV = R.getValue(getNameInit());
   1307   assert(RV && "Reference to a non-existent variable?");
   1308   ListInit *LI = dyn_cast<ListInit>(RV->getValue());
   1309   if (!LI)
   1310     return VarListElementInit::get(cast<TypedInit>(RV->getValue()), Elt);
   1311 
   1312   if (Elt >= LI->size())
   1313     return nullptr;  // Out of range reference.
   1314   Init *E = LI->getElement(Elt);
   1315   // If the element is set to some value, or if we are resolving a reference
   1316   // to a specific variable and that variable is explicitly unset, then
   1317   // replace the VarListElementInit with it.
   1318   if (IRV || !isa<UnsetInit>(E))
   1319     return E;
   1320   return nullptr;
   1321 }
   1322 
   1323 
   1324 RecTy *VarInit::getFieldType(const std::string &FieldName) const {
   1325   if (RecordRecTy *RTy = dyn_cast<RecordRecTy>(getType()))
   1326     if (const RecordVal *RV = RTy->getRecord()->getValue(FieldName))
   1327       return RV->getType();
   1328   return nullptr;
   1329 }
   1330 
   1331 Init *VarInit::getFieldInit(Record &R, const RecordVal *RV,
   1332                             const std::string &FieldName) const {
   1333   if (isa<RecordRecTy>(getType()))
   1334     if (const RecordVal *Val = R.getValue(VarName)) {
   1335       if (RV != Val && (RV || isa<UnsetInit>(Val->getValue())))
   1336         return nullptr;
   1337       Init *TheInit = Val->getValue();
   1338       assert(TheInit != this && "Infinite loop detected!");
   1339       if (Init *I = TheInit->getFieldInit(R, RV, FieldName))
   1340         return I;
   1341       return nullptr;
   1342     }
   1343   return nullptr;
   1344 }
   1345 
   1346 Init *VarInit::resolveReferences(Record &R, const RecordVal *RV) const {
   1347   if (RecordVal *Val = R.getValue(VarName))
   1348     if (RV == Val || (!RV && !isa<UnsetInit>(Val->getValue())))
   1349       return Val->getValue();
   1350   return const_cast<VarInit *>(this);
   1351 }
   1352 
   1353 VarBitInit *VarBitInit::get(TypedInit *T, unsigned B) {
   1354   typedef std::pair<TypedInit *, unsigned> Key;
   1355   static DenseMap<Key, std::unique_ptr<VarBitInit>> ThePool;
   1356 
   1357   Key TheKey(std::make_pair(T, B));
   1358 
   1359   std::unique_ptr<VarBitInit> &I = ThePool[TheKey];
   1360   if (!I) I.reset(new VarBitInit(T, B));
   1361   return I.get();
   1362 }
   1363 
   1364 Init *VarBitInit::convertInitializerTo(RecTy *Ty) const {
   1365   if (isa<BitRecTy>(Ty))
   1366     return const_cast<VarBitInit *>(this);
   1367 
   1368   return nullptr;
   1369 }
   1370 
   1371 std::string VarBitInit::getAsString() const {
   1372   return TI->getAsString() + "{" + utostr(Bit) + "}";
   1373 }
   1374 
   1375 Init *VarBitInit::resolveReferences(Record &R, const RecordVal *RV) const {
   1376   Init *I = TI->resolveReferences(R, RV);
   1377   if (TI != I)
   1378     return I->getBit(getBitNum());
   1379 
   1380   return const_cast<VarBitInit*>(this);
   1381 }
   1382 
   1383 VarListElementInit *VarListElementInit::get(TypedInit *T,
   1384                                             unsigned E) {
   1385   typedef std::pair<TypedInit *, unsigned> Key;
   1386   static DenseMap<Key, std::unique_ptr<VarListElementInit>> ThePool;
   1387 
   1388   Key TheKey(std::make_pair(T, E));
   1389 
   1390   std::unique_ptr<VarListElementInit> &I = ThePool[TheKey];
   1391   if (!I) I.reset(new VarListElementInit(T, E));
   1392   return I.get();
   1393 }
   1394 
   1395 std::string VarListElementInit::getAsString() const {
   1396   return TI->getAsString() + "[" + utostr(Element) + "]";
   1397 }
   1398 
   1399 Init *
   1400 VarListElementInit::resolveReferences(Record &R, const RecordVal *RV) const {
   1401   if (Init *I = getVariable()->resolveListElementReference(R, RV,
   1402                                                            getElementNum()))
   1403     return I;
   1404   return const_cast<VarListElementInit *>(this);
   1405 }
   1406 
   1407 Init *VarListElementInit::getBit(unsigned Bit) const {
   1408   if (getType() == BitRecTy::get())
   1409     return const_cast<VarListElementInit*>(this);
   1410   return VarBitInit::get(const_cast<VarListElementInit*>(this), Bit);
   1411 }
   1412 
   1413 Init *VarListElementInit:: resolveListElementReference(Record &R,
   1414                                                        const RecordVal *RV,
   1415                                                        unsigned Elt) const {
   1416   if (Init *Result = TI->resolveListElementReference(R, RV, Element)) {
   1417     if (TypedInit *TInit = dyn_cast<TypedInit>(Result)) {
   1418       if (Init *Result2 = TInit->resolveListElementReference(R, RV, Elt))
   1419         return Result2;
   1420       return VarListElementInit::get(TInit, Elt);
   1421     }
   1422     return Result;
   1423   }
   1424 
   1425   return nullptr;
   1426 }
   1427 
   1428 DefInit *DefInit::get(Record *R) {
   1429   return R->getDefInit();
   1430 }
   1431 
   1432 Init *DefInit::convertInitializerTo(RecTy *Ty) const {
   1433   if (auto *RRT = dyn_cast<RecordRecTy>(Ty))
   1434     if (getDef()->isSubClassOf(RRT->getRecord()))
   1435       return const_cast<DefInit *>(this);
   1436   return nullptr;
   1437 }
   1438 
   1439 RecTy *DefInit::getFieldType(const std::string &FieldName) const {
   1440   if (const RecordVal *RV = Def->getValue(FieldName))
   1441     return RV->getType();
   1442   return nullptr;
   1443 }
   1444 
   1445 Init *DefInit::getFieldInit(Record &R, const RecordVal *RV,
   1446                             const std::string &FieldName) const {
   1447   return Def->getValue(FieldName)->getValue();
   1448 }
   1449 
   1450 
   1451 std::string DefInit::getAsString() const {
   1452   return Def->getName();
   1453 }
   1454 
   1455 FieldInit *FieldInit::get(Init *R, const std::string &FN) {
   1456   typedef std::pair<Init *, TableGenStringKey> Key;
   1457   static DenseMap<Key, std::unique_ptr<FieldInit>> ThePool;
   1458 
   1459   Key TheKey(std::make_pair(R, FN));
   1460 
   1461   std::unique_ptr<FieldInit> &I = ThePool[TheKey];
   1462   if (!I) I.reset(new FieldInit(R, FN));
   1463   return I.get();
   1464 }
   1465 
   1466 Init *FieldInit::getBit(unsigned Bit) const {
   1467   if (getType() == BitRecTy::get())
   1468     return const_cast<FieldInit*>(this);
   1469   return VarBitInit::get(const_cast<FieldInit*>(this), Bit);
   1470 }
   1471 
   1472 Init *FieldInit::resolveListElementReference(Record &R, const RecordVal *RV,
   1473                                              unsigned Elt) const {
   1474   if (Init *ListVal = Rec->getFieldInit(R, RV, FieldName))
   1475     if (ListInit *LI = dyn_cast<ListInit>(ListVal)) {
   1476       if (Elt >= LI->size()) return nullptr;
   1477       Init *E = LI->getElement(Elt);
   1478 
   1479       // If the element is set to some value, or if we are resolving a
   1480       // reference to a specific variable and that variable is explicitly
   1481       // unset, then replace the VarListElementInit with it.
   1482       if (RV || !isa<UnsetInit>(E))
   1483         return E;
   1484     }
   1485   return nullptr;
   1486 }
   1487 
   1488 Init *FieldInit::resolveReferences(Record &R, const RecordVal *RV) const {
   1489   Init *NewRec = RV ? Rec->resolveReferences(R, RV) : Rec;
   1490 
   1491   if (Init *BitsVal = NewRec->getFieldInit(R, RV, FieldName)) {
   1492     Init *BVR = BitsVal->resolveReferences(R, RV);
   1493     return BVR->isComplete() ? BVR : const_cast<FieldInit *>(this);
   1494   }
   1495 
   1496   if (NewRec != Rec)
   1497     return FieldInit::get(NewRec, FieldName);
   1498   return const_cast<FieldInit *>(this);
   1499 }
   1500 
   1501 static void ProfileDagInit(FoldingSetNodeID &ID, Init *V, const std::string &VN,
   1502                            ArrayRef<Init *> ArgRange,
   1503                            ArrayRef<std::string> NameRange) {
   1504   ID.AddPointer(V);
   1505   ID.AddString(VN);
   1506 
   1507   ArrayRef<Init *>::iterator Arg  = ArgRange.begin();
   1508   ArrayRef<std::string>::iterator  Name = NameRange.begin();
   1509   while (Arg != ArgRange.end()) {
   1510     assert(Name != NameRange.end() && "Arg name underflow!");
   1511     ID.AddPointer(*Arg++);
   1512     ID.AddString(*Name++);
   1513   }
   1514   assert(Name == NameRange.end() && "Arg name overflow!");
   1515 }
   1516 
   1517 DagInit *
   1518 DagInit::get(Init *V, const std::string &VN,
   1519              ArrayRef<Init *> ArgRange,
   1520              ArrayRef<std::string> NameRange) {
   1521   static FoldingSet<DagInit> ThePool;
   1522   static std::vector<std::unique_ptr<DagInit>> TheActualPool;
   1523 
   1524   FoldingSetNodeID ID;
   1525   ProfileDagInit(ID, V, VN, ArgRange, NameRange);
   1526 
   1527   void *IP = nullptr;
   1528   if (DagInit *I = ThePool.FindNodeOrInsertPos(ID, IP))
   1529     return I;
   1530 
   1531   DagInit *I = new DagInit(V, VN, ArgRange, NameRange);
   1532   ThePool.InsertNode(I, IP);
   1533   TheActualPool.push_back(std::unique_ptr<DagInit>(I));
   1534   return I;
   1535 }
   1536 
   1537 DagInit *
   1538 DagInit::get(Init *V, const std::string &VN,
   1539              const std::vector<std::pair<Init*, std::string> > &args) {
   1540   std::vector<Init *> Args;
   1541   std::vector<std::string> Names;
   1542 
   1543   for (const auto &Arg : args) {
   1544     Args.push_back(Arg.first);
   1545     Names.push_back(Arg.second);
   1546   }
   1547 
   1548   return DagInit::get(V, VN, Args, Names);
   1549 }
   1550 
   1551 void DagInit::Profile(FoldingSetNodeID &ID) const {
   1552   ProfileDagInit(ID, Val, ValName, Args, ArgNames);
   1553 }
   1554 
   1555 Init *DagInit::convertInitializerTo(RecTy *Ty) const {
   1556   if (isa<DagRecTy>(Ty))
   1557     return const_cast<DagInit *>(this);
   1558 
   1559   return nullptr;
   1560 }
   1561 
   1562 Init *DagInit::resolveReferences(Record &R, const RecordVal *RV) const {
   1563   std::vector<Init*> NewArgs;
   1564   for (unsigned i = 0, e = Args.size(); i != e; ++i)
   1565     NewArgs.push_back(Args[i]->resolveReferences(R, RV));
   1566 
   1567   Init *Op = Val->resolveReferences(R, RV);
   1568 
   1569   if (Args != NewArgs || Op != Val)
   1570     return DagInit::get(Op, ValName, NewArgs, ArgNames);
   1571 
   1572   return const_cast<DagInit *>(this);
   1573 }
   1574 
   1575 
   1576 std::string DagInit::getAsString() const {
   1577   std::string Result = "(" + Val->getAsString();
   1578   if (!ValName.empty())
   1579     Result += ":" + ValName;
   1580   if (!Args.empty()) {
   1581     Result += " " + Args[0]->getAsString();
   1582     if (!ArgNames[0].empty()) Result += ":$" + ArgNames[0];
   1583     for (unsigned i = 1, e = Args.size(); i != e; ++i) {
   1584       Result += ", " + Args[i]->getAsString();
   1585       if (!ArgNames[i].empty()) Result += ":$" + ArgNames[i];
   1586     }
   1587   }
   1588   return Result + ")";
   1589 }
   1590 
   1591 
   1592 //===----------------------------------------------------------------------===//
   1593 //    Other implementations
   1594 //===----------------------------------------------------------------------===//
   1595 
   1596 RecordVal::RecordVal(Init *N, RecTy *T, bool P)
   1597   : NameAndPrefix(N, P), Ty(T) {
   1598   Value = UnsetInit::get()->convertInitializerTo(Ty);
   1599   assert(Value && "Cannot create unset value for current type!");
   1600 }
   1601 
   1602 RecordVal::RecordVal(const std::string &N, RecTy *T, bool P)
   1603   : NameAndPrefix(StringInit::get(N), P), Ty(T) {
   1604   Value = UnsetInit::get()->convertInitializerTo(Ty);
   1605   assert(Value && "Cannot create unset value for current type!");
   1606 }
   1607 
   1608 const std::string &RecordVal::getName() const {
   1609   return cast<StringInit>(getNameInit())->getValue();
   1610 }
   1611 
   1612 LLVM_DUMP_METHOD void RecordVal::dump() const { errs() << *this; }
   1613 
   1614 void RecordVal::print(raw_ostream &OS, bool PrintSem) const {
   1615   if (getPrefix()) OS << "field ";
   1616   OS << *getType() << " " << getNameInitAsString();
   1617 
   1618   if (getValue())
   1619     OS << " = " << *getValue();
   1620 
   1621   if (PrintSem) OS << ";\n";
   1622 }
   1623 
   1624 unsigned Record::LastID = 0;
   1625 
   1626 void Record::init() {
   1627   checkName();
   1628 
   1629   // Every record potentially has a def at the top.  This value is
   1630   // replaced with the top-level def name at instantiation time.
   1631   RecordVal DN("NAME", StringRecTy::get(), 0);
   1632   addValue(DN);
   1633 }
   1634 
   1635 void Record::checkName() {
   1636   // Ensure the record name has string type.
   1637   const TypedInit *TypedName = cast<const TypedInit>(Name);
   1638   if (!isa<StringRecTy>(TypedName->getType()))
   1639     PrintFatalError(getLoc(), "Record name is not a string!");
   1640 }
   1641 
   1642 DefInit *Record::getDefInit() {
   1643   if (!TheInit)
   1644     TheInit.reset(new DefInit(this, new RecordRecTy(this)));
   1645   return TheInit.get();
   1646 }
   1647 
   1648 const std::string &Record::getName() const {
   1649   return cast<StringInit>(Name)->getValue();
   1650 }
   1651 
   1652 void Record::setName(Init *NewName) {
   1653   Name = NewName;
   1654   checkName();
   1655   // DO NOT resolve record values to the name at this point because
   1656   // there might be default values for arguments of this def.  Those
   1657   // arguments might not have been resolved yet so we don't want to
   1658   // prematurely assume values for those arguments were not passed to
   1659   // this def.
   1660   //
   1661   // Nonetheless, it may be that some of this Record's values
   1662   // reference the record name.  Indeed, the reason for having the
   1663   // record name be an Init is to provide this flexibility.  The extra
   1664   // resolve steps after completely instantiating defs takes care of
   1665   // this.  See TGParser::ParseDef and TGParser::ParseDefm.
   1666 }
   1667 
   1668 void Record::setName(const std::string &Name) {
   1669   setName(StringInit::get(Name));
   1670 }
   1671 
   1672 void Record::resolveReferencesTo(const RecordVal *RV) {
   1673   for (unsigned i = 0, e = Values.size(); i != e; ++i) {
   1674     if (RV == &Values[i]) // Skip resolve the same field as the given one
   1675       continue;
   1676     if (Init *V = Values[i].getValue())
   1677       if (Values[i].setValue(V->resolveReferences(*this, RV)))
   1678         PrintFatalError(getLoc(), "Invalid value is found when setting '" +
   1679                         Values[i].getNameInitAsString() +
   1680                         "' after resolving references" +
   1681                         (RV ? " against '" + RV->getNameInitAsString() +
   1682                               "' of (" + RV->getValue()->getAsUnquotedString() +
   1683                               ")"
   1684                             : "") + "\n");
   1685   }
   1686   Init *OldName = getNameInit();
   1687   Init *NewName = Name->resolveReferences(*this, RV);
   1688   if (NewName != OldName) {
   1689     // Re-register with RecordKeeper.
   1690     setName(NewName);
   1691   }
   1692 }
   1693 
   1694 LLVM_DUMP_METHOD void Record::dump() const { errs() << *this; }
   1695 
   1696 raw_ostream &llvm::operator<<(raw_ostream &OS, const Record &R) {
   1697   OS << R.getNameInitAsString();
   1698 
   1699   ArrayRef<Init *> TArgs = R.getTemplateArgs();
   1700   if (!TArgs.empty()) {
   1701     OS << "<";
   1702     bool NeedComma = false;
   1703     for (const Init *TA : TArgs) {
   1704       if (NeedComma) OS << ", ";
   1705       NeedComma = true;
   1706       const RecordVal *RV = R.getValue(TA);
   1707       assert(RV && "Template argument record not found??");
   1708       RV->print(OS, false);
   1709     }
   1710     OS << ">";
   1711   }
   1712 
   1713   OS << " {";
   1714   ArrayRef<std::pair<Record *, SMRange>> SC = R.getSuperClasses();
   1715   if (!SC.empty()) {
   1716     OS << "\t//";
   1717     for (const auto &SuperPair : SC)
   1718       OS << " " << SuperPair.first->getNameInitAsString();
   1719   }
   1720   OS << "\n";
   1721 
   1722   for (const RecordVal &Val : R.getValues())
   1723     if (Val.getPrefix() && !R.isTemplateArg(Val.getName()))
   1724       OS << Val;
   1725   for (const RecordVal &Val : R.getValues())
   1726     if (!Val.getPrefix() && !R.isTemplateArg(Val.getName()))
   1727       OS << Val;
   1728 
   1729   return OS << "}\n";
   1730 }
   1731 
   1732 Init *Record::getValueInit(StringRef FieldName) const {
   1733   const RecordVal *R = getValue(FieldName);
   1734   if (!R || !R->getValue())
   1735     PrintFatalError(getLoc(), "Record `" + getName() +
   1736       "' does not have a field named `" + FieldName + "'!\n");
   1737   return R->getValue();
   1738 }
   1739 
   1740 
   1741 std::string Record::getValueAsString(StringRef FieldName) const {
   1742   const RecordVal *R = getValue(FieldName);
   1743   if (!R || !R->getValue())
   1744     PrintFatalError(getLoc(), "Record `" + getName() +
   1745       "' does not have a field named `" + FieldName + "'!\n");
   1746 
   1747   if (StringInit *SI = dyn_cast<StringInit>(R->getValue()))
   1748     return SI->getValue();
   1749   if (CodeInit *CI = dyn_cast<CodeInit>(R->getValue()))
   1750     return CI->getValue();
   1751 
   1752   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1753     FieldName + "' does not have a string initializer!");
   1754 }
   1755 
   1756 BitsInit *Record::getValueAsBitsInit(StringRef FieldName) const {
   1757   const RecordVal *R = getValue(FieldName);
   1758   if (!R || !R->getValue())
   1759     PrintFatalError(getLoc(), "Record `" + getName() +
   1760       "' does not have a field named `" + FieldName + "'!\n");
   1761 
   1762   if (BitsInit *BI = dyn_cast<BitsInit>(R->getValue()))
   1763     return BI;
   1764   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1765     FieldName + "' does not have a BitsInit initializer!");
   1766 }
   1767 
   1768 ListInit *Record::getValueAsListInit(StringRef FieldName) const {
   1769   const RecordVal *R = getValue(FieldName);
   1770   if (!R || !R->getValue())
   1771     PrintFatalError(getLoc(), "Record `" + getName() +
   1772       "' does not have a field named `" + FieldName + "'!\n");
   1773 
   1774   if (ListInit *LI = dyn_cast<ListInit>(R->getValue()))
   1775     return LI;
   1776   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1777     FieldName + "' does not have a list initializer!");
   1778 }
   1779 
   1780 std::vector<Record*>
   1781 Record::getValueAsListOfDefs(StringRef FieldName) const {
   1782   ListInit *List = getValueAsListInit(FieldName);
   1783   std::vector<Record*> Defs;
   1784   for (Init *I : List->getValues()) {
   1785     if (DefInit *DI = dyn_cast<DefInit>(I))
   1786       Defs.push_back(DI->getDef());
   1787     else
   1788       PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1789         FieldName + "' list is not entirely DefInit!");
   1790   }
   1791   return Defs;
   1792 }
   1793 
   1794 int64_t Record::getValueAsInt(StringRef FieldName) const {
   1795   const RecordVal *R = getValue(FieldName);
   1796   if (!R || !R->getValue())
   1797     PrintFatalError(getLoc(), "Record `" + getName() +
   1798       "' does not have a field named `" + FieldName + "'!\n");
   1799 
   1800   if (IntInit *II = dyn_cast<IntInit>(R->getValue()))
   1801     return II->getValue();
   1802   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1803     FieldName + "' does not have an int initializer!");
   1804 }
   1805 
   1806 std::vector<int64_t>
   1807 Record::getValueAsListOfInts(StringRef FieldName) const {
   1808   ListInit *List = getValueAsListInit(FieldName);
   1809   std::vector<int64_t> Ints;
   1810   for (Init *I : List->getValues()) {
   1811     if (IntInit *II = dyn_cast<IntInit>(I))
   1812       Ints.push_back(II->getValue());
   1813     else
   1814       PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1815         FieldName + "' does not have a list of ints initializer!");
   1816   }
   1817   return Ints;
   1818 }
   1819 
   1820 std::vector<std::string>
   1821 Record::getValueAsListOfStrings(StringRef FieldName) const {
   1822   ListInit *List = getValueAsListInit(FieldName);
   1823   std::vector<std::string> Strings;
   1824   for (Init *I : List->getValues()) {
   1825     if (StringInit *SI = dyn_cast<StringInit>(I))
   1826       Strings.push_back(SI->getValue());
   1827     else
   1828       PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1829         FieldName + "' does not have a list of strings initializer!");
   1830   }
   1831   return Strings;
   1832 }
   1833 
   1834 Record *Record::getValueAsDef(StringRef FieldName) const {
   1835   const RecordVal *R = getValue(FieldName);
   1836   if (!R || !R->getValue())
   1837     PrintFatalError(getLoc(), "Record `" + getName() +
   1838       "' does not have a field named `" + FieldName + "'!\n");
   1839 
   1840   if (DefInit *DI = dyn_cast<DefInit>(R->getValue()))
   1841     return DI->getDef();
   1842   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1843     FieldName + "' does not have a def initializer!");
   1844 }
   1845 
   1846 bool Record::getValueAsBit(StringRef FieldName) const {
   1847   const RecordVal *R = getValue(FieldName);
   1848   if (!R || !R->getValue())
   1849     PrintFatalError(getLoc(), "Record `" + getName() +
   1850       "' does not have a field named `" + FieldName + "'!\n");
   1851 
   1852   if (BitInit *BI = dyn_cast<BitInit>(R->getValue()))
   1853     return BI->getValue();
   1854   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1855     FieldName + "' does not have a bit initializer!");
   1856 }
   1857 
   1858 bool Record::getValueAsBitOrUnset(StringRef FieldName, bool &Unset) const {
   1859   const RecordVal *R = getValue(FieldName);
   1860   if (!R || !R->getValue())
   1861     PrintFatalError(getLoc(), "Record `" + getName() +
   1862       "' does not have a field named `" + FieldName.str() + "'!\n");
   1863 
   1864   if (isa<UnsetInit>(R->getValue())) {
   1865     Unset = true;
   1866     return false;
   1867   }
   1868   Unset = false;
   1869   if (BitInit *BI = dyn_cast<BitInit>(R->getValue()))
   1870     return BI->getValue();
   1871   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1872     FieldName + "' does not have a bit initializer!");
   1873 }
   1874 
   1875 DagInit *Record::getValueAsDag(StringRef FieldName) const {
   1876   const RecordVal *R = getValue(FieldName);
   1877   if (!R || !R->getValue())
   1878     PrintFatalError(getLoc(), "Record `" + getName() +
   1879       "' does not have a field named `" + FieldName + "'!\n");
   1880 
   1881   if (DagInit *DI = dyn_cast<DagInit>(R->getValue()))
   1882     return DI;
   1883   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1884     FieldName + "' does not have a dag initializer!");
   1885 }
   1886 
   1887 
   1888 LLVM_DUMP_METHOD void MultiClass::dump() const {
   1889   errs() << "Record:\n";
   1890   Rec.dump();
   1891 
   1892   errs() << "Defs:\n";
   1893   for (const auto &Proto : DefPrototypes)
   1894     Proto->dump();
   1895 }
   1896 
   1897 
   1898 LLVM_DUMP_METHOD void RecordKeeper::dump() const { errs() << *this; }
   1899 
   1900 raw_ostream &llvm::operator<<(raw_ostream &OS, const RecordKeeper &RK) {
   1901   OS << "------------- Classes -----------------\n";
   1902   for (const auto &C : RK.getClasses())
   1903     OS << "class " << *C.second;
   1904 
   1905   OS << "------------- Defs -----------------\n";
   1906   for (const auto &D : RK.getDefs())
   1907     OS << "def " << *D.second;
   1908   return OS;
   1909 }
   1910 
   1911 std::vector<Record *>
   1912 RecordKeeper::getAllDerivedDefinitions(const std::string &ClassName) const {
   1913   Record *Class = getClass(ClassName);
   1914   if (!Class)
   1915     PrintFatalError("ERROR: Couldn't find the `" + ClassName + "' class!\n");
   1916 
   1917   std::vector<Record*> Defs;
   1918   for (const auto &D : getDefs())
   1919     if (D.second->isSubClassOf(Class))
   1920       Defs.push_back(D.second.get());
   1921 
   1922   return Defs;
   1923 }
   1924 
   1925 Init *llvm::QualifyName(Record &CurRec, MultiClass *CurMultiClass,
   1926                         Init *Name, const std::string &Scoper) {
   1927   RecTy *Type = cast<TypedInit>(Name)->getType();
   1928 
   1929   BinOpInit *NewName =
   1930     BinOpInit::get(BinOpInit::STRCONCAT,
   1931                    BinOpInit::get(BinOpInit::STRCONCAT,
   1932                                   CurRec.getNameInit(),
   1933                                   StringInit::get(Scoper),
   1934                                   Type)->Fold(&CurRec, CurMultiClass),
   1935                    Name,
   1936                    Type);
   1937 
   1938   if (CurMultiClass && Scoper != "::") {
   1939     NewName =
   1940       BinOpInit::get(BinOpInit::STRCONCAT,
   1941                      BinOpInit::get(BinOpInit::STRCONCAT,
   1942                                     CurMultiClass->Rec.getNameInit(),
   1943                                     StringInit::get("::"),
   1944                                     Type)->Fold(&CurRec, CurMultiClass),
   1945                      NewName->Fold(&CurRec, CurMultiClass),
   1946                      Type);
   1947   }
   1948 
   1949   return NewName->Fold(&CurRec, CurMultiClass);
   1950 }
   1951 
   1952 Init *llvm::QualifyName(Record &CurRec, MultiClass *CurMultiClass,
   1953                         const std::string &Name,
   1954                         const std::string &Scoper) {
   1955   return QualifyName(CurRec, CurMultiClass, StringInit::get(Name), Scoper);
   1956 }
   1957