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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 /// TableGenStringKey - This is a wrapper for std::string suitable for
     36 /// using as a key to a DenseMap.  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 IntRecTy IntRecTy::Shared;
     86 StringRecTy StringRecTy::Shared;
     87 DagRecTy DagRecTy::Shared;
     88 
     89 void RecTy::anchor() { }
     90 void RecTy::dump() const { print(errs()); }
     91 
     92 ListRecTy *RecTy::getListTy() {
     93   if (!ListTy)
     94     ListTy = new ListRecTy(this);
     95   return ListTy;
     96 }
     97 
     98 bool RecTy::baseClassOf(const RecTy *RHS) const{
     99   assert (RHS && "NULL pointer");
    100   return Kind == RHS->getRecTyKind();
    101 }
    102 
    103 Init *BitRecTy::convertValue(BitsInit *BI) {
    104   if (BI->getNumBits() != 1) return nullptr; // Only accept if just one bit!
    105   return BI->getBit(0);
    106 }
    107 
    108 Init *BitRecTy::convertValue(IntInit *II) {
    109   int64_t Val = II->getValue();
    110   if (Val != 0 && Val != 1) return nullptr;  // Only accept 0 or 1 for a bit!
    111 
    112   return BitInit::get(Val != 0);
    113 }
    114 
    115 Init *BitRecTy::convertValue(TypedInit *VI) {
    116   RecTy *Ty = VI->getType();
    117   if (isa<BitRecTy>(Ty) || isa<BitsRecTy>(Ty) || isa<IntRecTy>(Ty))
    118     return VI;  // Accept variable if it is already of bit type!
    119   return nullptr;
    120 }
    121 
    122 bool BitRecTy::baseClassOf(const RecTy *RHS) const{
    123   if(RecTy::baseClassOf(RHS) || getRecTyKind() == IntRecTyKind)
    124     return true;
    125   if(const BitsRecTy *BitsTy = dyn_cast<BitsRecTy>(RHS))
    126     return BitsTy->getNumBits() == 1;
    127   return false;
    128 }
    129 
    130 BitsRecTy *BitsRecTy::get(unsigned Sz) {
    131   static std::vector<BitsRecTy*> Shared;
    132   if (Sz >= Shared.size())
    133     Shared.resize(Sz + 1);
    134   BitsRecTy *&Ty = Shared[Sz];
    135   if (!Ty)
    136     Ty = new BitsRecTy(Sz);
    137   return Ty;
    138 }
    139 
    140 std::string BitsRecTy::getAsString() const {
    141   return "bits<" + utostr(Size) + ">";
    142 }
    143 
    144 Init *BitsRecTy::convertValue(UnsetInit *UI) {
    145   SmallVector<Init *, 16> NewBits(Size);
    146 
    147   for (unsigned i = 0; i != Size; ++i)
    148     NewBits[i] = UnsetInit::get();
    149 
    150   return BitsInit::get(NewBits);
    151 }
    152 
    153 Init *BitsRecTy::convertValue(BitInit *UI) {
    154   if (Size != 1) return nullptr;  // Can only convert single bit.
    155   return BitsInit::get(UI);
    156 }
    157 
    158 /// canFitInBitfield - Return true if the number of bits is large enough to hold
    159 /// the integer value.
    160 static bool canFitInBitfield(int64_t Value, unsigned NumBits) {
    161   // For example, with NumBits == 4, we permit Values from [-7 .. 15].
    162   return (NumBits >= sizeof(Value) * 8) ||
    163          (Value >> NumBits == 0) || (Value >> (NumBits-1) == -1);
    164 }
    165 
    166 /// convertValue from Int initializer to bits type: Split the integer up into the
    167 /// appropriate bits.
    168 ///
    169 Init *BitsRecTy::convertValue(IntInit *II) {
    170   int64_t Value = II->getValue();
    171   // Make sure this bitfield is large enough to hold the integer value.
    172   if (!canFitInBitfield(Value, Size))
    173     return nullptr;
    174 
    175   SmallVector<Init *, 16> NewBits(Size);
    176 
    177   for (unsigned i = 0; i != Size; ++i)
    178     NewBits[i] = BitInit::get(Value & (1LL << i));
    179 
    180   return BitsInit::get(NewBits);
    181 }
    182 
    183 Init *BitsRecTy::convertValue(BitsInit *BI) {
    184   // If the number of bits is right, return it.  Otherwise we need to expand or
    185   // truncate.
    186   if (BI->getNumBits() == Size) return BI;
    187   return nullptr;
    188 }
    189 
    190 Init *BitsRecTy::convertValue(TypedInit *VI) {
    191   if (Size == 1 && isa<BitRecTy>(VI->getType()))
    192     return BitsInit::get(VI);
    193 
    194   if (VI->getType()->typeIsConvertibleTo(this)) {
    195     SmallVector<Init *, 16> NewBits(Size);
    196 
    197     for (unsigned i = 0; i != Size; ++i)
    198       NewBits[i] = VarBitInit::get(VI, i);
    199     return BitsInit::get(NewBits);
    200   }
    201 
    202   return nullptr;
    203 }
    204 
    205 bool BitsRecTy::baseClassOf(const RecTy *RHS) const{
    206   if (RecTy::baseClassOf(RHS)) //argument and the receiver are the same type
    207     return cast<BitsRecTy>(RHS)->Size == Size;
    208   RecTyKind kind = RHS->getRecTyKind();
    209   return (kind == BitRecTyKind && Size == 1) || (kind == IntRecTyKind);
    210 }
    211 
    212 Init *IntRecTy::convertValue(BitInit *BI) {
    213   return IntInit::get(BI->getValue());
    214 }
    215 
    216 Init *IntRecTy::convertValue(BitsInit *BI) {
    217   int64_t Result = 0;
    218   for (unsigned i = 0, e = BI->getNumBits(); i != e; ++i)
    219     if (BitInit *Bit = dyn_cast<BitInit>(BI->getBit(i))) {
    220       Result |= Bit->getValue() << i;
    221     } else {
    222       return nullptr;
    223     }
    224   return IntInit::get(Result);
    225 }
    226 
    227 Init *IntRecTy::convertValue(TypedInit *TI) {
    228   if (TI->getType()->typeIsConvertibleTo(this))
    229     return TI;  // Accept variable if already of the right type!
    230   return nullptr;
    231 }
    232 
    233 bool IntRecTy::baseClassOf(const RecTy *RHS) const{
    234   RecTyKind kind = RHS->getRecTyKind();
    235   return kind==BitRecTyKind || kind==BitsRecTyKind || kind==IntRecTyKind;
    236 }
    237 
    238 Init *StringRecTy::convertValue(UnOpInit *BO) {
    239   if (BO->getOpcode() == UnOpInit::CAST) {
    240     Init *L = BO->getOperand()->convertInitializerTo(this);
    241     if (!L) return nullptr;
    242     if (L != BO->getOperand())
    243       return UnOpInit::get(UnOpInit::CAST, L, new StringRecTy);
    244     return BO;
    245   }
    246 
    247   return convertValue((TypedInit*)BO);
    248 }
    249 
    250 Init *StringRecTy::convertValue(BinOpInit *BO) {
    251   if (BO->getOpcode() == BinOpInit::STRCONCAT) {
    252     Init *L = BO->getLHS()->convertInitializerTo(this);
    253     Init *R = BO->getRHS()->convertInitializerTo(this);
    254     if (!L || !R) return nullptr;
    255     if (L != BO->getLHS() || R != BO->getRHS())
    256       return BinOpInit::get(BinOpInit::STRCONCAT, L, R, new StringRecTy);
    257     return BO;
    258   }
    259 
    260   return convertValue((TypedInit*)BO);
    261 }
    262 
    263 
    264 Init *StringRecTy::convertValue(TypedInit *TI) {
    265   if (isa<StringRecTy>(TI->getType()))
    266     return TI;  // Accept variable if already of the right type!
    267   return nullptr;
    268 }
    269 
    270 std::string ListRecTy::getAsString() const {
    271   return "list<" + Ty->getAsString() + ">";
    272 }
    273 
    274 Init *ListRecTy::convertValue(ListInit *LI) {
    275   std::vector<Init*> Elements;
    276 
    277   // Verify that all of the elements of the list are subclasses of the
    278   // appropriate class!
    279   for (unsigned i = 0, e = LI->getSize(); i != e; ++i)
    280     if (Init *CI = LI->getElement(i)->convertInitializerTo(Ty))
    281       Elements.push_back(CI);
    282     else
    283       return nullptr;
    284 
    285   if (!isa<ListRecTy>(LI->getType()))
    286     return nullptr;
    287 
    288   return ListInit::get(Elements, this);
    289 }
    290 
    291 Init *ListRecTy::convertValue(TypedInit *TI) {
    292   // Ensure that TI is compatible with our class.
    293   if (ListRecTy *LRT = dyn_cast<ListRecTy>(TI->getType()))
    294     if (LRT->getElementType()->typeIsConvertibleTo(getElementType()))
    295       return TI;
    296   return nullptr;
    297 }
    298 
    299 bool ListRecTy::baseClassOf(const RecTy *RHS) const{
    300   if(const ListRecTy* ListTy = dyn_cast<ListRecTy>(RHS))
    301     return ListTy->getElementType()->typeIsConvertibleTo(Ty);
    302   return false;
    303 }
    304 
    305 Init *DagRecTy::convertValue(TypedInit *TI) {
    306   if (TI->getType()->typeIsConvertibleTo(this))
    307     return TI;
    308   return nullptr;
    309 }
    310 
    311 Init *DagRecTy::convertValue(UnOpInit *BO) {
    312   if (BO->getOpcode() == UnOpInit::CAST) {
    313     Init *L = BO->getOperand()->convertInitializerTo(this);
    314     if (!L) return nullptr;
    315     if (L != BO->getOperand())
    316       return UnOpInit::get(UnOpInit::CAST, L, new DagRecTy);
    317     return BO;
    318   }
    319   return nullptr;
    320 }
    321 
    322 Init *DagRecTy::convertValue(BinOpInit *BO) {
    323   if (BO->getOpcode() == BinOpInit::CONCAT) {
    324     Init *L = BO->getLHS()->convertInitializerTo(this);
    325     Init *R = BO->getRHS()->convertInitializerTo(this);
    326     if (!L || !R) return nullptr;
    327     if (L != BO->getLHS() || R != BO->getRHS())
    328       return BinOpInit::get(BinOpInit::CONCAT, L, R, new DagRecTy);
    329     return BO;
    330   }
    331   return nullptr;
    332 }
    333 
    334 RecordRecTy *RecordRecTy::get(Record *R) {
    335   return dyn_cast<RecordRecTy>(R->getDefInit()->getType());
    336 }
    337 
    338 std::string RecordRecTy::getAsString() const {
    339   return Rec->getName();
    340 }
    341 
    342 Init *RecordRecTy::convertValue(DefInit *DI) {
    343   // Ensure that DI is a subclass of Rec.
    344   if (!DI->getDef()->isSubClassOf(Rec))
    345     return nullptr;
    346   return DI;
    347 }
    348 
    349 Init *RecordRecTy::convertValue(TypedInit *TI) {
    350   // Ensure that TI is compatible with Rec.
    351   if (RecordRecTy *RRT = dyn_cast<RecordRecTy>(TI->getType()))
    352     if (RRT->getRecord()->isSubClassOf(getRecord()) ||
    353         RRT->getRecord() == getRecord())
    354       return TI;
    355   return nullptr;
    356 }
    357 
    358 bool RecordRecTy::baseClassOf(const RecTy *RHS) const{
    359   const RecordRecTy *RTy = dyn_cast<RecordRecTy>(RHS);
    360   if (!RTy)
    361     return false;
    362 
    363   if (Rec == RTy->getRecord() || RTy->getRecord()->isSubClassOf(Rec))
    364     return true;
    365 
    366   const std::vector<Record*> &SC = Rec->getSuperClasses();
    367   for (unsigned i = 0, e = SC.size(); i != e; ++i)
    368     if (RTy->getRecord()->isSubClassOf(SC[i]))
    369       return true;
    370 
    371   return false;
    372 }
    373 
    374 /// resolveTypes - Find a common type that T1 and T2 convert to.
    375 /// Return 0 if no such type exists.
    376 ///
    377 RecTy *llvm::resolveTypes(RecTy *T1, RecTy *T2) {
    378   if (T1->typeIsConvertibleTo(T2))
    379     return T2;
    380   if (T2->typeIsConvertibleTo(T1))
    381     return T1;
    382 
    383   // If one is a Record type, check superclasses
    384   if (RecordRecTy *RecTy1 = dyn_cast<RecordRecTy>(T1)) {
    385     // See if T2 inherits from a type T1 also inherits from
    386     const std::vector<Record *> &T1SuperClasses =
    387       RecTy1->getRecord()->getSuperClasses();
    388     for(std::vector<Record *>::const_iterator i = T1SuperClasses.begin(),
    389           iend = T1SuperClasses.end();
    390         i != iend;
    391         ++i) {
    392       RecordRecTy *SuperRecTy1 = RecordRecTy::get(*i);
    393       RecTy *NewType1 = resolveTypes(SuperRecTy1, T2);
    394       if (NewType1) {
    395         if (NewType1 != SuperRecTy1) {
    396           delete SuperRecTy1;
    397         }
    398         return NewType1;
    399       }
    400     }
    401   }
    402   if (RecordRecTy *RecTy2 = dyn_cast<RecordRecTy>(T2)) {
    403     // See if T1 inherits from a type T2 also inherits from
    404     const std::vector<Record *> &T2SuperClasses =
    405       RecTy2->getRecord()->getSuperClasses();
    406     for (std::vector<Record *>::const_iterator i = T2SuperClasses.begin(),
    407           iend = T2SuperClasses.end();
    408         i != iend;
    409         ++i) {
    410       RecordRecTy *SuperRecTy2 = RecordRecTy::get(*i);
    411       RecTy *NewType2 = resolveTypes(T1, SuperRecTy2);
    412       if (NewType2) {
    413         if (NewType2 != SuperRecTy2) {
    414           delete SuperRecTy2;
    415         }
    416         return NewType2;
    417       }
    418     }
    419   }
    420   return nullptr;
    421 }
    422 
    423 
    424 //===----------------------------------------------------------------------===//
    425 //    Initializer implementations
    426 //===----------------------------------------------------------------------===//
    427 
    428 void Init::anchor() { }
    429 void Init::dump() const { return print(errs()); }
    430 
    431 void UnsetInit::anchor() { }
    432 
    433 UnsetInit *UnsetInit::get() {
    434   static UnsetInit TheInit;
    435   return &TheInit;
    436 }
    437 
    438 void BitInit::anchor() { }
    439 
    440 BitInit *BitInit::get(bool V) {
    441   static BitInit True(true);
    442   static BitInit False(false);
    443 
    444   return V ? &True : &False;
    445 }
    446 
    447 static void
    448 ProfileBitsInit(FoldingSetNodeID &ID, ArrayRef<Init *> Range) {
    449   ID.AddInteger(Range.size());
    450 
    451   for (ArrayRef<Init *>::iterator i = Range.begin(),
    452          iend = Range.end();
    453        i != iend;
    454        ++i)
    455     ID.AddPointer(*i);
    456 }
    457 
    458 BitsInit *BitsInit::get(ArrayRef<Init *> Range) {
    459   typedef FoldingSet<BitsInit> Pool;
    460   static Pool ThePool;
    461 
    462   FoldingSetNodeID ID;
    463   ProfileBitsInit(ID, Range);
    464 
    465   void *IP = nullptr;
    466   if (BitsInit *I = ThePool.FindNodeOrInsertPos(ID, IP))
    467     return I;
    468 
    469   BitsInit *I = new BitsInit(Range);
    470   ThePool.InsertNode(I, IP);
    471 
    472   return I;
    473 }
    474 
    475 void BitsInit::Profile(FoldingSetNodeID &ID) const {
    476   ProfileBitsInit(ID, Bits);
    477 }
    478 
    479 Init *
    480 BitsInit::convertInitializerBitRange(const std::vector<unsigned> &Bits) const {
    481   SmallVector<Init *, 16> NewBits(Bits.size());
    482 
    483   for (unsigned i = 0, e = Bits.size(); i != e; ++i) {
    484     if (Bits[i] >= getNumBits())
    485       return nullptr;
    486     NewBits[i] = getBit(Bits[i]);
    487   }
    488   return BitsInit::get(NewBits);
    489 }
    490 
    491 std::string BitsInit::getAsString() const {
    492   std::string Result = "{ ";
    493   for (unsigned i = 0, e = getNumBits(); i != e; ++i) {
    494     if (i) Result += ", ";
    495     if (Init *Bit = getBit(e-i-1))
    496       Result += Bit->getAsString();
    497     else
    498       Result += "*";
    499   }
    500   return Result + " }";
    501 }
    502 
    503 // Fix bit initializer to preserve the behavior that bit reference from a unset
    504 // bits initializer will resolve into VarBitInit to keep the field name and bit
    505 // number used in targets with fixed insn length.
    506 static Init *fixBitInit(const RecordVal *RV, Init *Before, Init *After) {
    507   if (RV || After != UnsetInit::get())
    508     return After;
    509   return Before;
    510 }
    511 
    512 // resolveReferences - If there are any field references that refer to fields
    513 // that have been filled in, we can propagate the values now.
    514 //
    515 Init *BitsInit::resolveReferences(Record &R, const RecordVal *RV) const {
    516   bool Changed = false;
    517   SmallVector<Init *, 16> NewBits(getNumBits());
    518 
    519   Init *CachedInit = nullptr;
    520   Init *CachedBitVar = nullptr;
    521   bool CachedBitVarChanged = false;
    522 
    523   for (unsigned i = 0, e = getNumBits(); i != e; ++i) {
    524     Init *CurBit = Bits[i];
    525     Init *CurBitVar = CurBit->getBitVar();
    526 
    527     NewBits[i] = CurBit;
    528 
    529     if (CurBitVar == CachedBitVar) {
    530       if (CachedBitVarChanged) {
    531         Init *Bit = CachedInit->getBit(CurBit->getBitNum());
    532         NewBits[i] = fixBitInit(RV, CurBit, Bit);
    533       }
    534       continue;
    535     }
    536     CachedBitVar = CurBitVar;
    537     CachedBitVarChanged = false;
    538 
    539     Init *B;
    540     do {
    541       B = CurBitVar;
    542       CurBitVar = CurBitVar->resolveReferences(R, RV);
    543       CachedBitVarChanged |= B != CurBitVar;
    544       Changed |= B != CurBitVar;
    545     } while (B != CurBitVar);
    546     CachedInit = CurBitVar;
    547 
    548     if (CachedBitVarChanged) {
    549       Init *Bit = CurBitVar->getBit(CurBit->getBitNum());
    550       NewBits[i] = fixBitInit(RV, CurBit, Bit);
    551     }
    552   }
    553 
    554   if (Changed)
    555     return BitsInit::get(NewBits);
    556 
    557   return const_cast<BitsInit *>(this);
    558 }
    559 
    560 namespace {
    561   template<typename T>
    562   class Pool : public T {
    563   public:
    564     ~Pool();
    565   };
    566   template<typename T>
    567   Pool<T>::~Pool() {
    568     for (typename T::iterator I = this->begin(), E = this->end(); I != E; ++I) {
    569       typename T::value_type &Item = *I;
    570       delete Item.second;
    571     }
    572   }
    573 }
    574 
    575 IntInit *IntInit::get(int64_t V) {
    576   static Pool<DenseMap<int64_t, IntInit *> > ThePool;
    577 
    578   IntInit *&I = ThePool[V];
    579   if (!I) I = new IntInit(V);
    580   return I;
    581 }
    582 
    583 std::string IntInit::getAsString() const {
    584   return itostr(Value);
    585 }
    586 
    587 Init *
    588 IntInit::convertInitializerBitRange(const std::vector<unsigned> &Bits) const {
    589   SmallVector<Init *, 16> NewBits(Bits.size());
    590 
    591   for (unsigned i = 0, e = Bits.size(); i != e; ++i) {
    592     if (Bits[i] >= 64)
    593       return nullptr;
    594 
    595     NewBits[i] = BitInit::get(Value & (INT64_C(1) << Bits[i]));
    596   }
    597   return BitsInit::get(NewBits);
    598 }
    599 
    600 void StringInit::anchor() { }
    601 
    602 StringInit *StringInit::get(StringRef V) {
    603   static Pool<StringMap<StringInit *> > ThePool;
    604 
    605   StringInit *&I = ThePool[V];
    606   if (!I) I = new StringInit(V);
    607   return I;
    608 }
    609 
    610 static void ProfileListInit(FoldingSetNodeID &ID,
    611                             ArrayRef<Init *> Range,
    612                             RecTy *EltTy) {
    613   ID.AddInteger(Range.size());
    614   ID.AddPointer(EltTy);
    615 
    616   for (ArrayRef<Init *>::iterator i = Range.begin(),
    617          iend = Range.end();
    618        i != iend;
    619        ++i)
    620     ID.AddPointer(*i);
    621 }
    622 
    623 ListInit *ListInit::get(ArrayRef<Init *> Range, RecTy *EltTy) {
    624   typedef FoldingSet<ListInit> Pool;
    625   static Pool ThePool;
    626   static std::vector<std::unique_ptr<ListInit>> TheActualPool;
    627 
    628   FoldingSetNodeID ID;
    629   ProfileListInit(ID, Range, EltTy);
    630 
    631   void *IP = nullptr;
    632   if (ListInit *I = ThePool.FindNodeOrInsertPos(ID, IP))
    633     return I;
    634 
    635   ListInit *I = new ListInit(Range, EltTy);
    636   ThePool.InsertNode(I, IP);
    637   TheActualPool.push_back(std::unique_ptr<ListInit>(I));
    638   return I;
    639 }
    640 
    641 void ListInit::Profile(FoldingSetNodeID &ID) const {
    642   ListRecTy *ListType = dyn_cast<ListRecTy>(getType());
    643   assert(ListType && "Bad type for ListInit!");
    644   RecTy *EltTy = ListType->getElementType();
    645 
    646   ProfileListInit(ID, Values, EltTy);
    647 }
    648 
    649 Init *
    650 ListInit::convertInitListSlice(const std::vector<unsigned> &Elements) const {
    651   std::vector<Init*> Vals;
    652   for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
    653     if (Elements[i] >= getSize())
    654       return nullptr;
    655     Vals.push_back(getElement(Elements[i]));
    656   }
    657   return ListInit::get(Vals, getType());
    658 }
    659 
    660 Record *ListInit::getElementAsRecord(unsigned i) const {
    661   assert(i < Values.size() && "List element index out of range!");
    662   DefInit *DI = dyn_cast<DefInit>(Values[i]);
    663   if (!DI)
    664     PrintFatalError("Expected record in list!");
    665   return DI->getDef();
    666 }
    667 
    668 Init *ListInit::resolveReferences(Record &R, const RecordVal *RV) const {
    669   std::vector<Init*> Resolved;
    670   Resolved.reserve(getSize());
    671   bool Changed = false;
    672 
    673   for (unsigned i = 0, e = getSize(); i != e; ++i) {
    674     Init *E;
    675     Init *CurElt = getElement(i);
    676 
    677     do {
    678       E = CurElt;
    679       CurElt = CurElt->resolveReferences(R, RV);
    680       Changed |= E != CurElt;
    681     } while (E != CurElt);
    682     Resolved.push_back(E);
    683   }
    684 
    685   if (Changed)
    686     return ListInit::get(Resolved, getType());
    687   return const_cast<ListInit *>(this);
    688 }
    689 
    690 Init *ListInit::resolveListElementReference(Record &R, const RecordVal *IRV,
    691                                             unsigned Elt) const {
    692   if (Elt >= getSize())
    693     return nullptr;  // Out of range reference.
    694   Init *E = getElement(Elt);
    695   // If the element is set to some value, or if we are resolving a reference
    696   // to a specific variable and that variable is explicitly unset, then
    697   // replace the VarListElementInit with it.
    698   if (IRV || !isa<UnsetInit>(E))
    699     return E;
    700   return nullptr;
    701 }
    702 
    703 std::string ListInit::getAsString() const {
    704   std::string Result = "[";
    705   for (unsigned i = 0, e = Values.size(); i != e; ++i) {
    706     if (i) Result += ", ";
    707     Result += Values[i]->getAsString();
    708   }
    709   return Result + "]";
    710 }
    711 
    712 Init *OpInit::resolveListElementReference(Record &R, const RecordVal *IRV,
    713                                           unsigned Elt) const {
    714   Init *Resolved = resolveReferences(R, IRV);
    715   OpInit *OResolved = dyn_cast<OpInit>(Resolved);
    716   if (OResolved) {
    717     Resolved = OResolved->Fold(&R, nullptr);
    718   }
    719 
    720   if (Resolved != this) {
    721     TypedInit *Typed = dyn_cast<TypedInit>(Resolved);
    722     assert(Typed && "Expected typed init for list reference");
    723     if (Typed) {
    724       Init *New = Typed->resolveListElementReference(R, IRV, Elt);
    725       if (New)
    726         return New;
    727       return VarListElementInit::get(Typed, Elt);
    728     }
    729   }
    730 
    731   return nullptr;
    732 }
    733 
    734 Init *OpInit::getBit(unsigned Bit) const {
    735   if (getType() == BitRecTy::get())
    736     return const_cast<OpInit*>(this);
    737   return VarBitInit::get(const_cast<OpInit*>(this), Bit);
    738 }
    739 
    740 UnOpInit *UnOpInit::get(UnaryOp opc, Init *lhs, RecTy *Type) {
    741   typedef std::pair<std::pair<unsigned, Init *>, RecTy *> Key;
    742   static Pool<DenseMap<Key, UnOpInit *> > ThePool;
    743 
    744   Key TheKey(std::make_pair(std::make_pair(opc, lhs), Type));
    745 
    746   UnOpInit *&I = ThePool[TheKey];
    747   if (!I) I = new UnOpInit(opc, lhs, Type);
    748   return I;
    749 }
    750 
    751 Init *UnOpInit::Fold(Record *CurRec, MultiClass *CurMultiClass) const {
    752   switch (getOpcode()) {
    753   case CAST: {
    754     if (getType()->getAsString() == "string") {
    755       if (StringInit *LHSs = dyn_cast<StringInit>(LHS))
    756         return LHSs;
    757 
    758       if (DefInit *LHSd = dyn_cast<DefInit>(LHS))
    759         return StringInit::get(LHSd->getDef()->getName());
    760 
    761       if (IntInit *LHSi = dyn_cast<IntInit>(LHS))
    762         return StringInit::get(LHSi->getAsString());
    763     } else {
    764       if (StringInit *LHSs = dyn_cast<StringInit>(LHS)) {
    765         std::string Name = LHSs->getValue();
    766 
    767         // From TGParser::ParseIDValue
    768         if (CurRec) {
    769           if (const RecordVal *RV = CurRec->getValue(Name)) {
    770             if (RV->getType() != getType())
    771               PrintFatalError("type mismatch in cast");
    772             return VarInit::get(Name, RV->getType());
    773           }
    774 
    775           Init *TemplateArgName = QualifyName(*CurRec, CurMultiClass, Name,
    776                                               ":");
    777 
    778           if (CurRec->isTemplateArg(TemplateArgName)) {
    779             const RecordVal *RV = CurRec->getValue(TemplateArgName);
    780             assert(RV && "Template arg doesn't exist??");
    781 
    782             if (RV->getType() != getType())
    783               PrintFatalError("type mismatch in cast");
    784 
    785             return VarInit::get(TemplateArgName, RV->getType());
    786           }
    787         }
    788 
    789         if (CurMultiClass) {
    790           Init *MCName = QualifyName(CurMultiClass->Rec, CurMultiClass, Name, "::");
    791 
    792           if (CurMultiClass->Rec.isTemplateArg(MCName)) {
    793             const RecordVal *RV = CurMultiClass->Rec.getValue(MCName);
    794             assert(RV && "Template arg doesn't exist??");
    795 
    796             if (RV->getType() != getType())
    797               PrintFatalError("type mismatch in cast");
    798 
    799             return VarInit::get(MCName, RV->getType());
    800           }
    801         }
    802 
    803         if (Record *D = (CurRec->getRecords()).getDef(Name))
    804           return DefInit::get(D);
    805 
    806         PrintFatalError(CurRec->getLoc(),
    807                         "Undefined reference:'" + Name + "'\n");
    808       }
    809     }
    810     break;
    811   }
    812   case HEAD: {
    813     if (ListInit *LHSl = dyn_cast<ListInit>(LHS)) {
    814       assert(LHSl->getSize() != 0 && "Empty list in car");
    815       return LHSl->getElement(0);
    816     }
    817     break;
    818   }
    819   case TAIL: {
    820     if (ListInit *LHSl = dyn_cast<ListInit>(LHS)) {
    821       assert(LHSl->getSize() != 0 && "Empty list in cdr");
    822       // Note the +1.  We can't just pass the result of getValues()
    823       // directly.
    824       ArrayRef<Init *>::iterator begin = LHSl->getValues().begin()+1;
    825       ArrayRef<Init *>::iterator end   = LHSl->getValues().end();
    826       ListInit *Result =
    827         ListInit::get(ArrayRef<Init *>(begin, end - begin),
    828                       LHSl->getType());
    829       return Result;
    830     }
    831     break;
    832   }
    833   case EMPTY: {
    834     if (ListInit *LHSl = dyn_cast<ListInit>(LHS)) {
    835       if (LHSl->getSize() == 0) {
    836         return IntInit::get(1);
    837       } else {
    838         return IntInit::get(0);
    839       }
    840     }
    841     if (StringInit *LHSs = dyn_cast<StringInit>(LHS)) {
    842       if (LHSs->getValue().empty()) {
    843         return IntInit::get(1);
    844       } else {
    845         return IntInit::get(0);
    846       }
    847     }
    848 
    849     break;
    850   }
    851   }
    852   return const_cast<UnOpInit *>(this);
    853 }
    854 
    855 Init *UnOpInit::resolveReferences(Record &R, const RecordVal *RV) const {
    856   Init *lhs = LHS->resolveReferences(R, RV);
    857 
    858   if (LHS != lhs)
    859     return (UnOpInit::get(getOpcode(), lhs, getType()))->Fold(&R, nullptr);
    860   return Fold(&R, nullptr);
    861 }
    862 
    863 std::string UnOpInit::getAsString() const {
    864   std::string Result;
    865   switch (Opc) {
    866   case CAST: Result = "!cast<" + getType()->getAsString() + ">"; break;
    867   case HEAD: Result = "!head"; break;
    868   case TAIL: Result = "!tail"; break;
    869   case EMPTY: Result = "!empty"; break;
    870   }
    871   return Result + "(" + LHS->getAsString() + ")";
    872 }
    873 
    874 BinOpInit *BinOpInit::get(BinaryOp opc, Init *lhs,
    875                           Init *rhs, RecTy *Type) {
    876   typedef std::pair<
    877     std::pair<std::pair<unsigned, Init *>, Init *>,
    878     RecTy *
    879     > Key;
    880 
    881   static Pool<DenseMap<Key, BinOpInit *> > ThePool;
    882 
    883   Key TheKey(std::make_pair(std::make_pair(std::make_pair(opc, lhs), rhs),
    884                             Type));
    885 
    886   BinOpInit *&I = ThePool[TheKey];
    887   if (!I) I = new BinOpInit(opc, lhs, rhs, Type);
    888   return I;
    889 }
    890 
    891 Init *BinOpInit::Fold(Record *CurRec, MultiClass *CurMultiClass) const {
    892   switch (getOpcode()) {
    893   case CONCAT: {
    894     DagInit *LHSs = dyn_cast<DagInit>(LHS);
    895     DagInit *RHSs = dyn_cast<DagInit>(RHS);
    896     if (LHSs && RHSs) {
    897       DefInit *LOp = dyn_cast<DefInit>(LHSs->getOperator());
    898       DefInit *ROp = dyn_cast<DefInit>(RHSs->getOperator());
    899       if (!LOp || !ROp || LOp->getDef() != ROp->getDef())
    900         PrintFatalError("Concated Dag operators do not match!");
    901       std::vector<Init*> Args;
    902       std::vector<std::string> ArgNames;
    903       for (unsigned i = 0, e = LHSs->getNumArgs(); i != e; ++i) {
    904         Args.push_back(LHSs->getArg(i));
    905         ArgNames.push_back(LHSs->getArgName(i));
    906       }
    907       for (unsigned i = 0, e = RHSs->getNumArgs(); i != e; ++i) {
    908         Args.push_back(RHSs->getArg(i));
    909         ArgNames.push_back(RHSs->getArgName(i));
    910       }
    911       return DagInit::get(LHSs->getOperator(), "", Args, ArgNames);
    912     }
    913     break;
    914   }
    915   case LISTCONCAT: {
    916     ListInit *LHSs = dyn_cast<ListInit>(LHS);
    917     ListInit *RHSs = dyn_cast<ListInit>(RHS);
    918     if (LHSs && RHSs) {
    919       std::vector<Init *> Args;
    920       Args.insert(Args.end(), LHSs->begin(), LHSs->end());
    921       Args.insert(Args.end(), RHSs->begin(), RHSs->end());
    922       return ListInit::get(
    923           Args, static_cast<ListRecTy *>(LHSs->getType())->getElementType());
    924     }
    925     break;
    926   }
    927   case STRCONCAT: {
    928     StringInit *LHSs = dyn_cast<StringInit>(LHS);
    929     StringInit *RHSs = dyn_cast<StringInit>(RHS);
    930     if (LHSs && RHSs)
    931       return StringInit::get(LHSs->getValue() + RHSs->getValue());
    932     break;
    933   }
    934   case EQ: {
    935     // try to fold eq comparison for 'bit' and 'int', otherwise fallback
    936     // to string objects.
    937     IntInit *L =
    938       dyn_cast_or_null<IntInit>(LHS->convertInitializerTo(IntRecTy::get()));
    939     IntInit *R =
    940       dyn_cast_or_null<IntInit>(RHS->convertInitializerTo(IntRecTy::get()));
    941 
    942     if (L && R)
    943       return IntInit::get(L->getValue() == R->getValue());
    944 
    945     StringInit *LHSs = dyn_cast<StringInit>(LHS);
    946     StringInit *RHSs = dyn_cast<StringInit>(RHS);
    947 
    948     // Make sure we've resolved
    949     if (LHSs && RHSs)
    950       return IntInit::get(LHSs->getValue() == RHSs->getValue());
    951 
    952     break;
    953   }
    954   case ADD:
    955   case SHL:
    956   case SRA:
    957   case SRL: {
    958     IntInit *LHSi = dyn_cast<IntInit>(LHS);
    959     IntInit *RHSi = dyn_cast<IntInit>(RHS);
    960     if (LHSi && RHSi) {
    961       int64_t LHSv = LHSi->getValue(), RHSv = RHSi->getValue();
    962       int64_t Result;
    963       switch (getOpcode()) {
    964       default: llvm_unreachable("Bad opcode!");
    965       case ADD: Result = LHSv +  RHSv; break;
    966       case SHL: Result = LHSv << RHSv; break;
    967       case SRA: Result = LHSv >> RHSv; break;
    968       case SRL: Result = (uint64_t)LHSv >> (uint64_t)RHSv; break;
    969       }
    970       return IntInit::get(Result);
    971     }
    972     break;
    973   }
    974   }
    975   return const_cast<BinOpInit *>(this);
    976 }
    977 
    978 Init *BinOpInit::resolveReferences(Record &R, const RecordVal *RV) const {
    979   Init *lhs = LHS->resolveReferences(R, RV);
    980   Init *rhs = RHS->resolveReferences(R, RV);
    981 
    982   if (LHS != lhs || RHS != rhs)
    983     return (BinOpInit::get(getOpcode(), lhs, rhs, getType()))->Fold(&R,nullptr);
    984   return Fold(&R, nullptr);
    985 }
    986 
    987 std::string BinOpInit::getAsString() const {
    988   std::string Result;
    989   switch (Opc) {
    990   case CONCAT: Result = "!con"; break;
    991   case ADD: Result = "!add"; break;
    992   case SHL: Result = "!shl"; break;
    993   case SRA: Result = "!sra"; break;
    994   case SRL: Result = "!srl"; break;
    995   case EQ: Result = "!eq"; break;
    996   case LISTCONCAT: Result = "!listconcat"; break;
    997   case STRCONCAT: Result = "!strconcat"; break;
    998   }
    999   return Result + "(" + LHS->getAsString() + ", " + RHS->getAsString() + ")";
   1000 }
   1001 
   1002 TernOpInit *TernOpInit::get(TernaryOp opc, Init *lhs,
   1003                                   Init *mhs, Init *rhs,
   1004                                   RecTy *Type) {
   1005   typedef std::pair<
   1006     std::pair<
   1007       std::pair<std::pair<unsigned, RecTy *>, Init *>,
   1008       Init *
   1009       >,
   1010     Init *
   1011     > Key;
   1012 
   1013   typedef DenseMap<Key, TernOpInit *> Pool;
   1014   static Pool ThePool;
   1015 
   1016   Key TheKey(std::make_pair(std::make_pair(std::make_pair(std::make_pair(opc,
   1017                                                                          Type),
   1018                                                           lhs),
   1019                                            mhs),
   1020                             rhs));
   1021 
   1022   TernOpInit *&I = ThePool[TheKey];
   1023   if (!I) I = new TernOpInit(opc, lhs, mhs, rhs, Type);
   1024   return I;
   1025 }
   1026 
   1027 static Init *ForeachHelper(Init *LHS, Init *MHS, Init *RHS, RecTy *Type,
   1028                            Record *CurRec, MultiClass *CurMultiClass);
   1029 
   1030 static Init *EvaluateOperation(OpInit *RHSo, Init *LHS, Init *Arg,
   1031                                RecTy *Type, Record *CurRec,
   1032                                MultiClass *CurMultiClass) {
   1033   std::vector<Init *> NewOperands;
   1034 
   1035   TypedInit *TArg = dyn_cast<TypedInit>(Arg);
   1036 
   1037   // If this is a dag, recurse
   1038   if (TArg && TArg->getType()->getAsString() == "dag") {
   1039     Init *Result = ForeachHelper(LHS, Arg, RHSo, Type,
   1040                                  CurRec, CurMultiClass);
   1041     return Result;
   1042   }
   1043 
   1044   for (int i = 0; i < RHSo->getNumOperands(); ++i) {
   1045     OpInit *RHSoo = dyn_cast<OpInit>(RHSo->getOperand(i));
   1046 
   1047     if (RHSoo) {
   1048       Init *Result = EvaluateOperation(RHSoo, LHS, Arg,
   1049                                        Type, CurRec, CurMultiClass);
   1050       if (Result) {
   1051         NewOperands.push_back(Result);
   1052       } else {
   1053         NewOperands.push_back(Arg);
   1054       }
   1055     } else if (LHS->getAsString() == RHSo->getOperand(i)->getAsString()) {
   1056       NewOperands.push_back(Arg);
   1057     } else {
   1058       NewOperands.push_back(RHSo->getOperand(i));
   1059     }
   1060   }
   1061 
   1062   // Now run the operator and use its result as the new leaf
   1063   const OpInit *NewOp = RHSo->clone(NewOperands);
   1064   Init *NewVal = NewOp->Fold(CurRec, CurMultiClass);
   1065   return (NewVal != NewOp) ? NewVal : nullptr;
   1066 }
   1067 
   1068 static Init *ForeachHelper(Init *LHS, Init *MHS, Init *RHS, RecTy *Type,
   1069                            Record *CurRec, MultiClass *CurMultiClass) {
   1070   DagInit *MHSd = dyn_cast<DagInit>(MHS);
   1071   ListInit *MHSl = dyn_cast<ListInit>(MHS);
   1072 
   1073   OpInit *RHSo = dyn_cast<OpInit>(RHS);
   1074 
   1075   if (!RHSo) {
   1076     PrintFatalError(CurRec->getLoc(), "!foreach requires an operator\n");
   1077   }
   1078 
   1079   TypedInit *LHSt = dyn_cast<TypedInit>(LHS);
   1080 
   1081   if (!LHSt)
   1082     PrintFatalError(CurRec->getLoc(), "!foreach requires typed variable\n");
   1083 
   1084   if ((MHSd && isa<DagRecTy>(Type)) || (MHSl && isa<ListRecTy>(Type))) {
   1085     if (MHSd) {
   1086       Init *Val = MHSd->getOperator();
   1087       Init *Result = EvaluateOperation(RHSo, LHS, Val,
   1088                                        Type, CurRec, CurMultiClass);
   1089       if (Result) {
   1090         Val = Result;
   1091       }
   1092 
   1093       std::vector<std::pair<Init *, std::string> > args;
   1094       for (unsigned int i = 0; i < MHSd->getNumArgs(); ++i) {
   1095         Init *Arg;
   1096         std::string ArgName;
   1097         Arg = MHSd->getArg(i);
   1098         ArgName = MHSd->getArgName(i);
   1099 
   1100         // Process args
   1101         Init *Result = EvaluateOperation(RHSo, LHS, Arg, Type,
   1102                                          CurRec, CurMultiClass);
   1103         if (Result) {
   1104           Arg = Result;
   1105         }
   1106 
   1107         // TODO: Process arg names
   1108         args.push_back(std::make_pair(Arg, ArgName));
   1109       }
   1110 
   1111       return DagInit::get(Val, "", args);
   1112     }
   1113     if (MHSl) {
   1114       std::vector<Init *> NewOperands;
   1115       std::vector<Init *> NewList(MHSl->begin(), MHSl->end());
   1116 
   1117       for (std::vector<Init *>::iterator li = NewList.begin(),
   1118              liend = NewList.end();
   1119            li != liend;
   1120            ++li) {
   1121         Init *Item = *li;
   1122         NewOperands.clear();
   1123         for(int i = 0; i < RHSo->getNumOperands(); ++i) {
   1124           // First, replace the foreach variable with the list item
   1125           if (LHS->getAsString() == RHSo->getOperand(i)->getAsString()) {
   1126             NewOperands.push_back(Item);
   1127           } else {
   1128             NewOperands.push_back(RHSo->getOperand(i));
   1129           }
   1130         }
   1131 
   1132         // Now run the operator and use its result as the new list item
   1133         const OpInit *NewOp = RHSo->clone(NewOperands);
   1134         Init *NewItem = NewOp->Fold(CurRec, CurMultiClass);
   1135         if (NewItem != NewOp)
   1136           *li = NewItem;
   1137       }
   1138       return ListInit::get(NewList, MHSl->getType());
   1139     }
   1140   }
   1141   return nullptr;
   1142 }
   1143 
   1144 Init *TernOpInit::Fold(Record *CurRec, MultiClass *CurMultiClass) const {
   1145   switch (getOpcode()) {
   1146   case SUBST: {
   1147     DefInit *LHSd = dyn_cast<DefInit>(LHS);
   1148     VarInit *LHSv = dyn_cast<VarInit>(LHS);
   1149     StringInit *LHSs = dyn_cast<StringInit>(LHS);
   1150 
   1151     DefInit *MHSd = dyn_cast<DefInit>(MHS);
   1152     VarInit *MHSv = dyn_cast<VarInit>(MHS);
   1153     StringInit *MHSs = dyn_cast<StringInit>(MHS);
   1154 
   1155     DefInit *RHSd = dyn_cast<DefInit>(RHS);
   1156     VarInit *RHSv = dyn_cast<VarInit>(RHS);
   1157     StringInit *RHSs = dyn_cast<StringInit>(RHS);
   1158 
   1159     if ((LHSd && MHSd && RHSd)
   1160         || (LHSv && MHSv && RHSv)
   1161         || (LHSs && MHSs && RHSs)) {
   1162       if (RHSd) {
   1163         Record *Val = RHSd->getDef();
   1164         if (LHSd->getAsString() == RHSd->getAsString()) {
   1165           Val = MHSd->getDef();
   1166         }
   1167         return DefInit::get(Val);
   1168       }
   1169       if (RHSv) {
   1170         std::string Val = RHSv->getName();
   1171         if (LHSv->getAsString() == RHSv->getAsString()) {
   1172           Val = MHSv->getName();
   1173         }
   1174         return VarInit::get(Val, getType());
   1175       }
   1176       if (RHSs) {
   1177         std::string Val = RHSs->getValue();
   1178 
   1179         std::string::size_type found;
   1180         std::string::size_type idx = 0;
   1181         do {
   1182           found = Val.find(LHSs->getValue(), idx);
   1183           if (found != std::string::npos) {
   1184             Val.replace(found, LHSs->getValue().size(), MHSs->getValue());
   1185           }
   1186           idx = found +  MHSs->getValue().size();
   1187         } while (found != std::string::npos);
   1188 
   1189         return StringInit::get(Val);
   1190       }
   1191     }
   1192     break;
   1193   }
   1194 
   1195   case FOREACH: {
   1196     Init *Result = ForeachHelper(LHS, MHS, RHS, getType(),
   1197                                  CurRec, CurMultiClass);
   1198     if (Result) {
   1199       return Result;
   1200     }
   1201     break;
   1202   }
   1203 
   1204   case IF: {
   1205     IntInit *LHSi = dyn_cast<IntInit>(LHS);
   1206     if (Init *I = LHS->convertInitializerTo(IntRecTy::get()))
   1207       LHSi = dyn_cast<IntInit>(I);
   1208     if (LHSi) {
   1209       if (LHSi->getValue()) {
   1210         return MHS;
   1211       } else {
   1212         return RHS;
   1213       }
   1214     }
   1215     break;
   1216   }
   1217   }
   1218 
   1219   return const_cast<TernOpInit *>(this);
   1220 }
   1221 
   1222 Init *TernOpInit::resolveReferences(Record &R,
   1223                                     const RecordVal *RV) const {
   1224   Init *lhs = LHS->resolveReferences(R, RV);
   1225 
   1226   if (Opc == IF && lhs != LHS) {
   1227     IntInit *Value = dyn_cast<IntInit>(lhs);
   1228     if (Init *I = lhs->convertInitializerTo(IntRecTy::get()))
   1229       Value = dyn_cast<IntInit>(I);
   1230     if (Value) {
   1231       // Short-circuit
   1232       if (Value->getValue()) {
   1233         Init *mhs = MHS->resolveReferences(R, RV);
   1234         return (TernOpInit::get(getOpcode(), lhs, mhs,
   1235                                 RHS, getType()))->Fold(&R, nullptr);
   1236       } else {
   1237         Init *rhs = RHS->resolveReferences(R, RV);
   1238         return (TernOpInit::get(getOpcode(), lhs, MHS,
   1239                                 rhs, getType()))->Fold(&R, nullptr);
   1240       }
   1241     }
   1242   }
   1243 
   1244   Init *mhs = MHS->resolveReferences(R, RV);
   1245   Init *rhs = RHS->resolveReferences(R, RV);
   1246 
   1247   if (LHS != lhs || MHS != mhs || RHS != rhs)
   1248     return (TernOpInit::get(getOpcode(), lhs, mhs, rhs,
   1249                             getType()))->Fold(&R, nullptr);
   1250   return Fold(&R, nullptr);
   1251 }
   1252 
   1253 std::string TernOpInit::getAsString() const {
   1254   std::string Result;
   1255   switch (Opc) {
   1256   case SUBST: Result = "!subst"; break;
   1257   case FOREACH: Result = "!foreach"; break;
   1258   case IF: Result = "!if"; break;
   1259  }
   1260   return Result + "(" + LHS->getAsString() + ", " + MHS->getAsString() + ", "
   1261     + RHS->getAsString() + ")";
   1262 }
   1263 
   1264 RecTy *TypedInit::getFieldType(const std::string &FieldName) const {
   1265   if (RecordRecTy *RecordType = dyn_cast<RecordRecTy>(getType()))
   1266     if (RecordVal *Field = RecordType->getRecord()->getValue(FieldName))
   1267       return Field->getType();
   1268   return nullptr;
   1269 }
   1270 
   1271 Init *
   1272 TypedInit::convertInitializerBitRange(const std::vector<unsigned> &Bits) const {
   1273   BitsRecTy *T = dyn_cast<BitsRecTy>(getType());
   1274   if (!T) return nullptr;  // Cannot subscript a non-bits variable.
   1275   unsigned NumBits = T->getNumBits();
   1276 
   1277   SmallVector<Init *, 16> NewBits(Bits.size());
   1278   for (unsigned i = 0, e = Bits.size(); i != e; ++i) {
   1279     if (Bits[i] >= NumBits)
   1280       return nullptr;
   1281 
   1282     NewBits[i] = VarBitInit::get(const_cast<TypedInit *>(this), Bits[i]);
   1283   }
   1284   return BitsInit::get(NewBits);
   1285 }
   1286 
   1287 Init *
   1288 TypedInit::convertInitListSlice(const std::vector<unsigned> &Elements) const {
   1289   ListRecTy *T = dyn_cast<ListRecTy>(getType());
   1290   if (!T) return nullptr;  // Cannot subscript a non-list variable.
   1291 
   1292   if (Elements.size() == 1)
   1293     return VarListElementInit::get(const_cast<TypedInit *>(this), Elements[0]);
   1294 
   1295   std::vector<Init*> ListInits;
   1296   ListInits.reserve(Elements.size());
   1297   for (unsigned i = 0, e = Elements.size(); i != e; ++i)
   1298     ListInits.push_back(VarListElementInit::get(const_cast<TypedInit *>(this),
   1299                                                 Elements[i]));
   1300   return ListInit::get(ListInits, T);
   1301 }
   1302 
   1303 
   1304 VarInit *VarInit::get(const std::string &VN, RecTy *T) {
   1305   Init *Value = StringInit::get(VN);
   1306   return VarInit::get(Value, T);
   1307 }
   1308 
   1309 VarInit *VarInit::get(Init *VN, RecTy *T) {
   1310   typedef std::pair<RecTy *, Init *> Key;
   1311   static Pool<DenseMap<Key, VarInit *> > ThePool;
   1312 
   1313   Key TheKey(std::make_pair(T, VN));
   1314 
   1315   VarInit *&I = ThePool[TheKey];
   1316   if (!I) I = new VarInit(VN, T);
   1317   return I;
   1318 }
   1319 
   1320 const std::string &VarInit::getName() const {
   1321   StringInit *NameString = dyn_cast<StringInit>(getNameInit());
   1322   assert(NameString && "VarInit name is not a string!");
   1323   return NameString->getValue();
   1324 }
   1325 
   1326 Init *VarInit::getBit(unsigned Bit) const {
   1327   if (getType() == BitRecTy::get())
   1328     return const_cast<VarInit*>(this);
   1329   return VarBitInit::get(const_cast<VarInit*>(this), Bit);
   1330 }
   1331 
   1332 Init *VarInit::resolveListElementReference(Record &R,
   1333                                            const RecordVal *IRV,
   1334                                            unsigned Elt) const {
   1335   if (R.isTemplateArg(getNameInit())) return nullptr;
   1336   if (IRV && IRV->getNameInit() != getNameInit()) return nullptr;
   1337 
   1338   RecordVal *RV = R.getValue(getNameInit());
   1339   assert(RV && "Reference to a non-existent variable?");
   1340   ListInit *LI = dyn_cast<ListInit>(RV->getValue());
   1341   if (!LI) {
   1342     TypedInit *VI = dyn_cast<TypedInit>(RV->getValue());
   1343     assert(VI && "Invalid list element!");
   1344     return VarListElementInit::get(VI, Elt);
   1345   }
   1346 
   1347   if (Elt >= LI->getSize())
   1348     return nullptr;  // Out of range reference.
   1349   Init *E = LI->getElement(Elt);
   1350   // If the element is set to some value, or if we are resolving a reference
   1351   // to a specific variable and that variable is explicitly unset, then
   1352   // replace the VarListElementInit with it.
   1353   if (IRV || !isa<UnsetInit>(E))
   1354     return E;
   1355   return nullptr;
   1356 }
   1357 
   1358 
   1359 RecTy *VarInit::getFieldType(const std::string &FieldName) const {
   1360   if (RecordRecTy *RTy = dyn_cast<RecordRecTy>(getType()))
   1361     if (const RecordVal *RV = RTy->getRecord()->getValue(FieldName))
   1362       return RV->getType();
   1363   return nullptr;
   1364 }
   1365 
   1366 Init *VarInit::getFieldInit(Record &R, const RecordVal *RV,
   1367                             const std::string &FieldName) const {
   1368   if (isa<RecordRecTy>(getType()))
   1369     if (const RecordVal *Val = R.getValue(VarName)) {
   1370       if (RV != Val && (RV || isa<UnsetInit>(Val->getValue())))
   1371         return nullptr;
   1372       Init *TheInit = Val->getValue();
   1373       assert(TheInit != this && "Infinite loop detected!");
   1374       if (Init *I = TheInit->getFieldInit(R, RV, FieldName))
   1375         return I;
   1376       else
   1377         return nullptr;
   1378     }
   1379   return nullptr;
   1380 }
   1381 
   1382 /// resolveReferences - This method is used by classes that refer to other
   1383 /// variables which may not be defined at the time the expression is formed.
   1384 /// If a value is set for the variable later, this method will be called on
   1385 /// users of the value to allow the value to propagate out.
   1386 ///
   1387 Init *VarInit::resolveReferences(Record &R, const RecordVal *RV) const {
   1388   if (RecordVal *Val = R.getValue(VarName))
   1389     if (RV == Val || (!RV && !isa<UnsetInit>(Val->getValue())))
   1390       return Val->getValue();
   1391   return const_cast<VarInit *>(this);
   1392 }
   1393 
   1394 VarBitInit *VarBitInit::get(TypedInit *T, unsigned B) {
   1395   typedef std::pair<TypedInit *, unsigned> Key;
   1396   typedef DenseMap<Key, VarBitInit *> Pool;
   1397 
   1398   static Pool ThePool;
   1399 
   1400   Key TheKey(std::make_pair(T, B));
   1401 
   1402   VarBitInit *&I = ThePool[TheKey];
   1403   if (!I) I = new VarBitInit(T, B);
   1404   return I;
   1405 }
   1406 
   1407 std::string VarBitInit::getAsString() const {
   1408    return TI->getAsString() + "{" + utostr(Bit) + "}";
   1409 }
   1410 
   1411 Init *VarBitInit::resolveReferences(Record &R, const RecordVal *RV) const {
   1412   Init *I = TI->resolveReferences(R, RV);
   1413   if (TI != I)
   1414     return I->getBit(getBitNum());
   1415 
   1416   return const_cast<VarBitInit*>(this);
   1417 }
   1418 
   1419 VarListElementInit *VarListElementInit::get(TypedInit *T,
   1420                                             unsigned E) {
   1421   typedef std::pair<TypedInit *, unsigned> Key;
   1422   typedef DenseMap<Key, VarListElementInit *> Pool;
   1423 
   1424   static Pool ThePool;
   1425 
   1426   Key TheKey(std::make_pair(T, E));
   1427 
   1428   VarListElementInit *&I = ThePool[TheKey];
   1429   if (!I) I = new VarListElementInit(T, E);
   1430   return I;
   1431 }
   1432 
   1433 std::string VarListElementInit::getAsString() const {
   1434   return TI->getAsString() + "[" + utostr(Element) + "]";
   1435 }
   1436 
   1437 Init *
   1438 VarListElementInit::resolveReferences(Record &R, const RecordVal *RV) const {
   1439   if (Init *I = getVariable()->resolveListElementReference(R, RV,
   1440                                                            getElementNum()))
   1441     return I;
   1442   return const_cast<VarListElementInit *>(this);
   1443 }
   1444 
   1445 Init *VarListElementInit::getBit(unsigned Bit) const {
   1446   if (getType() == BitRecTy::get())
   1447     return const_cast<VarListElementInit*>(this);
   1448   return VarBitInit::get(const_cast<VarListElementInit*>(this), Bit);
   1449 }
   1450 
   1451 Init *VarListElementInit:: resolveListElementReference(Record &R,
   1452                                                        const RecordVal *RV,
   1453                                                        unsigned Elt) const {
   1454   Init *Result = TI->resolveListElementReference(R, RV, Element);
   1455 
   1456   if (Result) {
   1457     if (TypedInit *TInit = dyn_cast<TypedInit>(Result)) {
   1458       Init *Result2 = TInit->resolveListElementReference(R, RV, Elt);
   1459       if (Result2) return Result2;
   1460       return new VarListElementInit(TInit, Elt);
   1461     }
   1462     return Result;
   1463   }
   1464 
   1465   return nullptr;
   1466 }
   1467 
   1468 DefInit *DefInit::get(Record *R) {
   1469   return R->getDefInit();
   1470 }
   1471 
   1472 RecTy *DefInit::getFieldType(const std::string &FieldName) const {
   1473   if (const RecordVal *RV = Def->getValue(FieldName))
   1474     return RV->getType();
   1475   return nullptr;
   1476 }
   1477 
   1478 Init *DefInit::getFieldInit(Record &R, const RecordVal *RV,
   1479                             const std::string &FieldName) const {
   1480   return Def->getValue(FieldName)->getValue();
   1481 }
   1482 
   1483 
   1484 std::string DefInit::getAsString() const {
   1485   return Def->getName();
   1486 }
   1487 
   1488 FieldInit *FieldInit::get(Init *R, const std::string &FN) {
   1489   typedef std::pair<Init *, TableGenStringKey> Key;
   1490   typedef DenseMap<Key, FieldInit *> Pool;
   1491   static Pool ThePool;
   1492 
   1493   Key TheKey(std::make_pair(R, FN));
   1494 
   1495   FieldInit *&I = ThePool[TheKey];
   1496   if (!I) I = new FieldInit(R, FN);
   1497   return I;
   1498 }
   1499 
   1500 Init *FieldInit::getBit(unsigned Bit) const {
   1501   if (getType() == BitRecTy::get())
   1502     return const_cast<FieldInit*>(this);
   1503   return VarBitInit::get(const_cast<FieldInit*>(this), Bit);
   1504 }
   1505 
   1506 Init *FieldInit::resolveListElementReference(Record &R, const RecordVal *RV,
   1507                                              unsigned Elt) const {
   1508   if (Init *ListVal = Rec->getFieldInit(R, RV, FieldName))
   1509     if (ListInit *LI = dyn_cast<ListInit>(ListVal)) {
   1510       if (Elt >= LI->getSize()) return nullptr;
   1511       Init *E = LI->getElement(Elt);
   1512 
   1513       // If the element is set to some value, or if we are resolving a
   1514       // reference to a specific variable and that variable is explicitly
   1515       // unset, then replace the VarListElementInit with it.
   1516       if (RV || !isa<UnsetInit>(E))
   1517         return E;
   1518     }
   1519   return nullptr;
   1520 }
   1521 
   1522 Init *FieldInit::resolveReferences(Record &R, const RecordVal *RV) const {
   1523   Init *NewRec = RV ? Rec->resolveReferences(R, RV) : Rec;
   1524 
   1525   Init *BitsVal = NewRec->getFieldInit(R, RV, FieldName);
   1526   if (BitsVal) {
   1527     Init *BVR = BitsVal->resolveReferences(R, RV);
   1528     return BVR->isComplete() ? BVR : const_cast<FieldInit *>(this);
   1529   }
   1530 
   1531   if (NewRec != Rec) {
   1532     return FieldInit::get(NewRec, FieldName);
   1533   }
   1534   return const_cast<FieldInit *>(this);
   1535 }
   1536 
   1537 static void ProfileDagInit(FoldingSetNodeID &ID, Init *V, const std::string &VN,
   1538                            ArrayRef<Init *> ArgRange,
   1539                            ArrayRef<std::string> NameRange) {
   1540   ID.AddPointer(V);
   1541   ID.AddString(VN);
   1542 
   1543   ArrayRef<Init *>::iterator Arg  = ArgRange.begin();
   1544   ArrayRef<std::string>::iterator  Name = NameRange.begin();
   1545   while (Arg != ArgRange.end()) {
   1546     assert(Name != NameRange.end() && "Arg name underflow!");
   1547     ID.AddPointer(*Arg++);
   1548     ID.AddString(*Name++);
   1549   }
   1550   assert(Name == NameRange.end() && "Arg name overflow!");
   1551 }
   1552 
   1553 DagInit *
   1554 DagInit::get(Init *V, const std::string &VN,
   1555              ArrayRef<Init *> ArgRange,
   1556              ArrayRef<std::string> NameRange) {
   1557   typedef FoldingSet<DagInit> Pool;
   1558   static Pool ThePool;
   1559 
   1560   FoldingSetNodeID ID;
   1561   ProfileDagInit(ID, V, VN, ArgRange, NameRange);
   1562 
   1563   void *IP = nullptr;
   1564   if (DagInit *I = ThePool.FindNodeOrInsertPos(ID, IP))
   1565     return I;
   1566 
   1567   DagInit *I = new DagInit(V, VN, ArgRange, NameRange);
   1568   ThePool.InsertNode(I, IP);
   1569 
   1570   return I;
   1571 }
   1572 
   1573 DagInit *
   1574 DagInit::get(Init *V, const std::string &VN,
   1575              const std::vector<std::pair<Init*, std::string> > &args) {
   1576   typedef std::pair<Init*, std::string> PairType;
   1577 
   1578   std::vector<Init *> Args;
   1579   std::vector<std::string> Names;
   1580 
   1581   for (std::vector<PairType>::const_iterator i = args.begin(),
   1582          iend = args.end();
   1583        i != iend;
   1584        ++i) {
   1585     Args.push_back(i->first);
   1586     Names.push_back(i->second);
   1587   }
   1588 
   1589   return DagInit::get(V, VN, Args, Names);
   1590 }
   1591 
   1592 void DagInit::Profile(FoldingSetNodeID &ID) const {
   1593   ProfileDagInit(ID, Val, ValName, Args, ArgNames);
   1594 }
   1595 
   1596 Init *DagInit::resolveReferences(Record &R, const RecordVal *RV) const {
   1597   std::vector<Init*> NewArgs;
   1598   for (unsigned i = 0, e = Args.size(); i != e; ++i)
   1599     NewArgs.push_back(Args[i]->resolveReferences(R, RV));
   1600 
   1601   Init *Op = Val->resolveReferences(R, RV);
   1602 
   1603   if (Args != NewArgs || Op != Val)
   1604     return DagInit::get(Op, ValName, NewArgs, ArgNames);
   1605 
   1606   return const_cast<DagInit *>(this);
   1607 }
   1608 
   1609 
   1610 std::string DagInit::getAsString() const {
   1611   std::string Result = "(" + Val->getAsString();
   1612   if (!ValName.empty())
   1613     Result += ":" + ValName;
   1614   if (Args.size()) {
   1615     Result += " " + Args[0]->getAsString();
   1616     if (!ArgNames[0].empty()) Result += ":$" + ArgNames[0];
   1617     for (unsigned i = 1, e = Args.size(); i != e; ++i) {
   1618       Result += ", " + Args[i]->getAsString();
   1619       if (!ArgNames[i].empty()) Result += ":$" + ArgNames[i];
   1620     }
   1621   }
   1622   return Result + ")";
   1623 }
   1624 
   1625 
   1626 //===----------------------------------------------------------------------===//
   1627 //    Other implementations
   1628 //===----------------------------------------------------------------------===//
   1629 
   1630 RecordVal::RecordVal(Init *N, RecTy *T, unsigned P)
   1631   : Name(N), Ty(T), Prefix(P) {
   1632   Value = Ty->convertValue(UnsetInit::get());
   1633   assert(Value && "Cannot create unset value for current type!");
   1634 }
   1635 
   1636 RecordVal::RecordVal(const std::string &N, RecTy *T, unsigned P)
   1637   : Name(StringInit::get(N)), Ty(T), Prefix(P) {
   1638   Value = Ty->convertValue(UnsetInit::get());
   1639   assert(Value && "Cannot create unset value for current type!");
   1640 }
   1641 
   1642 const std::string &RecordVal::getName() const {
   1643   StringInit *NameString = dyn_cast<StringInit>(Name);
   1644   assert(NameString && "RecordVal name is not a string!");
   1645   return NameString->getValue();
   1646 }
   1647 
   1648 void RecordVal::dump() const { errs() << *this; }
   1649 
   1650 void RecordVal::print(raw_ostream &OS, bool PrintSem) const {
   1651   if (getPrefix()) OS << "field ";
   1652   OS << *getType() << " " << getNameInitAsString();
   1653 
   1654   if (getValue())
   1655     OS << " = " << *getValue();
   1656 
   1657   if (PrintSem) OS << ";\n";
   1658 }
   1659 
   1660 unsigned Record::LastID = 0;
   1661 
   1662 void Record::init() {
   1663   checkName();
   1664 
   1665   // Every record potentially has a def at the top.  This value is
   1666   // replaced with the top-level def name at instantiation time.
   1667   RecordVal DN("NAME", StringRecTy::get(), 0);
   1668   addValue(DN);
   1669 }
   1670 
   1671 void Record::checkName() {
   1672   // Ensure the record name has string type.
   1673   const TypedInit *TypedName = dyn_cast<const TypedInit>(Name);
   1674   assert(TypedName && "Record name is not typed!");
   1675   RecTy *Type = TypedName->getType();
   1676   if (!isa<StringRecTy>(Type))
   1677     PrintFatalError(getLoc(), "Record name is not a string!");
   1678 }
   1679 
   1680 DefInit *Record::getDefInit() {
   1681   if (!TheInit)
   1682     TheInit = new DefInit(this, new RecordRecTy(this));
   1683   return TheInit;
   1684 }
   1685 
   1686 const std::string &Record::getName() const {
   1687   const StringInit *NameString = dyn_cast<StringInit>(Name);
   1688   assert(NameString && "Record name is not a string!");
   1689   return NameString->getValue();
   1690 }
   1691 
   1692 void Record::setName(Init *NewName) {
   1693   if (TrackedRecords.getDef(Name->getAsUnquotedString()) == this) {
   1694     TrackedRecords.removeDef(Name->getAsUnquotedString());
   1695     TrackedRecords.addDef(this);
   1696   } else if (TrackedRecords.getClass(Name->getAsUnquotedString()) == this) {
   1697     TrackedRecords.removeClass(Name->getAsUnquotedString());
   1698     TrackedRecords.addClass(this);
   1699   }  // Otherwise this isn't yet registered.
   1700   Name = NewName;
   1701   checkName();
   1702   // DO NOT resolve record values to the name at this point because
   1703   // there might be default values for arguments of this def.  Those
   1704   // arguments might not have been resolved yet so we don't want to
   1705   // prematurely assume values for those arguments were not passed to
   1706   // this def.
   1707   //
   1708   // Nonetheless, it may be that some of this Record's values
   1709   // reference the record name.  Indeed, the reason for having the
   1710   // record name be an Init is to provide this flexibility.  The extra
   1711   // resolve steps after completely instantiating defs takes care of
   1712   // this.  See TGParser::ParseDef and TGParser::ParseDefm.
   1713 }
   1714 
   1715 void Record::setName(const std::string &Name) {
   1716   setName(StringInit::get(Name));
   1717 }
   1718 
   1719 /// resolveReferencesTo - If anything in this record refers to RV, replace the
   1720 /// reference to RV with the RHS of RV.  If RV is null, we resolve all possible
   1721 /// references.
   1722 void Record::resolveReferencesTo(const RecordVal *RV) {
   1723   for (unsigned i = 0, e = Values.size(); i != e; ++i) {
   1724     if (RV == &Values[i]) // Skip resolve the same field as the given one
   1725       continue;
   1726     if (Init *V = Values[i].getValue())
   1727       if (Values[i].setValue(V->resolveReferences(*this, RV)))
   1728         PrintFatalError(getLoc(), "Invalid value is found when setting '"
   1729                       + Values[i].getNameInitAsString()
   1730                       + "' after resolving references"
   1731                       + (RV ? " against '" + RV->getNameInitAsString()
   1732                               + "' of ("
   1733                               + RV->getValue()->getAsUnquotedString() + ")"
   1734                             : "")
   1735                       + "\n");
   1736   }
   1737   Init *OldName = getNameInit();
   1738   Init *NewName = Name->resolveReferences(*this, RV);
   1739   if (NewName != OldName) {
   1740     // Re-register with RecordKeeper.
   1741     setName(NewName);
   1742   }
   1743 }
   1744 
   1745 void Record::dump() const { errs() << *this; }
   1746 
   1747 raw_ostream &llvm::operator<<(raw_ostream &OS, const Record &R) {
   1748   OS << R.getNameInitAsString();
   1749 
   1750   const std::vector<Init *> &TArgs = R.getTemplateArgs();
   1751   if (!TArgs.empty()) {
   1752     OS << "<";
   1753     for (unsigned i = 0, e = TArgs.size(); i != e; ++i) {
   1754       if (i) OS << ", ";
   1755       const RecordVal *RV = R.getValue(TArgs[i]);
   1756       assert(RV && "Template argument record not found??");
   1757       RV->print(OS, false);
   1758     }
   1759     OS << ">";
   1760   }
   1761 
   1762   OS << " {";
   1763   const std::vector<Record*> &SC = R.getSuperClasses();
   1764   if (!SC.empty()) {
   1765     OS << "\t//";
   1766     for (unsigned i = 0, e = SC.size(); i != e; ++i)
   1767       OS << " " << SC[i]->getNameInitAsString();
   1768   }
   1769   OS << "\n";
   1770 
   1771   const std::vector<RecordVal> &Vals = R.getValues();
   1772   for (unsigned i = 0, e = Vals.size(); i != e; ++i)
   1773     if (Vals[i].getPrefix() && !R.isTemplateArg(Vals[i].getName()))
   1774       OS << Vals[i];
   1775   for (unsigned i = 0, e = Vals.size(); i != e; ++i)
   1776     if (!Vals[i].getPrefix() && !R.isTemplateArg(Vals[i].getName()))
   1777       OS << Vals[i];
   1778 
   1779   return OS << "}\n";
   1780 }
   1781 
   1782 /// getValueInit - Return the initializer for a value with the specified name,
   1783 /// or abort if the field does not exist.
   1784 ///
   1785 Init *Record::getValueInit(StringRef FieldName) const {
   1786   const RecordVal *R = getValue(FieldName);
   1787   if (!R || !R->getValue())
   1788     PrintFatalError(getLoc(), "Record `" + getName() +
   1789       "' does not have a field named `" + FieldName + "'!\n");
   1790   return R->getValue();
   1791 }
   1792 
   1793 
   1794 /// getValueAsString - This method looks up the specified field and returns its
   1795 /// value as a string, aborts if the field does not exist or if
   1796 /// the value is not a string.
   1797 ///
   1798 std::string Record::getValueAsString(StringRef FieldName) const {
   1799   const RecordVal *R = getValue(FieldName);
   1800   if (!R || !R->getValue())
   1801     PrintFatalError(getLoc(), "Record `" + getName() +
   1802       "' does not have a field named `" + FieldName + "'!\n");
   1803 
   1804   if (StringInit *SI = dyn_cast<StringInit>(R->getValue()))
   1805     return SI->getValue();
   1806   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1807     FieldName + "' does not have a string initializer!");
   1808 }
   1809 
   1810 /// getValueAsBitsInit - This method looks up the specified field and returns
   1811 /// its value as a BitsInit, aborts if the field does not exist or if
   1812 /// the value is not the right type.
   1813 ///
   1814 BitsInit *Record::getValueAsBitsInit(StringRef FieldName) const {
   1815   const RecordVal *R = getValue(FieldName);
   1816   if (!R || !R->getValue())
   1817     PrintFatalError(getLoc(), "Record `" + getName() +
   1818       "' does not have a field named `" + FieldName + "'!\n");
   1819 
   1820   if (BitsInit *BI = dyn_cast<BitsInit>(R->getValue()))
   1821     return BI;
   1822   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1823     FieldName + "' does not have a BitsInit initializer!");
   1824 }
   1825 
   1826 /// getValueAsListInit - This method looks up the specified field and returns
   1827 /// its value as a ListInit, aborting if the field does not exist or if
   1828 /// the value is not the right type.
   1829 ///
   1830 ListInit *Record::getValueAsListInit(StringRef FieldName) const {
   1831   const RecordVal *R = getValue(FieldName);
   1832   if (!R || !R->getValue())
   1833     PrintFatalError(getLoc(), "Record `" + getName() +
   1834       "' does not have a field named `" + FieldName + "'!\n");
   1835 
   1836   if (ListInit *LI = dyn_cast<ListInit>(R->getValue()))
   1837     return LI;
   1838   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1839     FieldName + "' does not have a list initializer!");
   1840 }
   1841 
   1842 /// getValueAsListOfDefs - This method looks up the specified field and returns
   1843 /// its value as a vector of records, aborting if the field does not exist
   1844 /// or if the value is not the right type.
   1845 ///
   1846 std::vector<Record*>
   1847 Record::getValueAsListOfDefs(StringRef FieldName) const {
   1848   ListInit *List = getValueAsListInit(FieldName);
   1849   std::vector<Record*> Defs;
   1850   for (unsigned i = 0; i < List->getSize(); i++) {
   1851     if (DefInit *DI = dyn_cast<DefInit>(List->getElement(i))) {
   1852       Defs.push_back(DI->getDef());
   1853     } else {
   1854       PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1855         FieldName + "' list is not entirely DefInit!");
   1856     }
   1857   }
   1858   return Defs;
   1859 }
   1860 
   1861 /// getValueAsInt - This method looks up the specified field and returns its
   1862 /// value as an int64_t, aborting if the field does not exist or if the value
   1863 /// is not the right type.
   1864 ///
   1865 int64_t Record::getValueAsInt(StringRef FieldName) const {
   1866   const RecordVal *R = getValue(FieldName);
   1867   if (!R || !R->getValue())
   1868     PrintFatalError(getLoc(), "Record `" + getName() +
   1869       "' does not have a field named `" + FieldName + "'!\n");
   1870 
   1871   if (IntInit *II = dyn_cast<IntInit>(R->getValue()))
   1872     return II->getValue();
   1873   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1874     FieldName + "' does not have an int initializer!");
   1875 }
   1876 
   1877 /// getValueAsListOfInts - This method looks up the specified field and returns
   1878 /// its value as a vector of integers, aborting if the field does not exist or
   1879 /// if the value is not the right type.
   1880 ///
   1881 std::vector<int64_t>
   1882 Record::getValueAsListOfInts(StringRef FieldName) const {
   1883   ListInit *List = getValueAsListInit(FieldName);
   1884   std::vector<int64_t> Ints;
   1885   for (unsigned i = 0; i < List->getSize(); i++) {
   1886     if (IntInit *II = dyn_cast<IntInit>(List->getElement(i))) {
   1887       Ints.push_back(II->getValue());
   1888     } else {
   1889       PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1890         FieldName + "' does not have a list of ints initializer!");
   1891     }
   1892   }
   1893   return Ints;
   1894 }
   1895 
   1896 /// getValueAsListOfStrings - This method looks up the specified field and
   1897 /// returns its value as a vector of strings, aborting if the field does not
   1898 /// exist or if the value is not the right type.
   1899 ///
   1900 std::vector<std::string>
   1901 Record::getValueAsListOfStrings(StringRef FieldName) const {
   1902   ListInit *List = getValueAsListInit(FieldName);
   1903   std::vector<std::string> Strings;
   1904   for (unsigned i = 0; i < List->getSize(); i++) {
   1905     if (StringInit *II = dyn_cast<StringInit>(List->getElement(i))) {
   1906       Strings.push_back(II->getValue());
   1907     } else {
   1908       PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1909         FieldName + "' does not have a list of strings initializer!");
   1910     }
   1911   }
   1912   return Strings;
   1913 }
   1914 
   1915 /// getValueAsDef - This method looks up the specified field and returns its
   1916 /// value as a Record, aborting if the field does not exist or if the value
   1917 /// is not the right type.
   1918 ///
   1919 Record *Record::getValueAsDef(StringRef FieldName) const {
   1920   const RecordVal *R = getValue(FieldName);
   1921   if (!R || !R->getValue())
   1922     PrintFatalError(getLoc(), "Record `" + getName() +
   1923       "' does not have a field named `" + FieldName + "'!\n");
   1924 
   1925   if (DefInit *DI = dyn_cast<DefInit>(R->getValue()))
   1926     return DI->getDef();
   1927   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1928     FieldName + "' does not have a def initializer!");
   1929 }
   1930 
   1931 /// getValueAsBit - This method looks up the specified field and returns its
   1932 /// value as a bit, aborting if the field does not exist or if the value is
   1933 /// not the right type.
   1934 ///
   1935 bool Record::getValueAsBit(StringRef FieldName) const {
   1936   const RecordVal *R = getValue(FieldName);
   1937   if (!R || !R->getValue())
   1938     PrintFatalError(getLoc(), "Record `" + getName() +
   1939       "' does not have a field named `" + FieldName + "'!\n");
   1940 
   1941   if (BitInit *BI = dyn_cast<BitInit>(R->getValue()))
   1942     return BI->getValue();
   1943   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1944     FieldName + "' does not have a bit initializer!");
   1945 }
   1946 
   1947 bool Record::getValueAsBitOrUnset(StringRef FieldName, bool &Unset) const {
   1948   const RecordVal *R = getValue(FieldName);
   1949   if (!R || !R->getValue())
   1950     PrintFatalError(getLoc(), "Record `" + getName() +
   1951       "' does not have a field named `" + FieldName.str() + "'!\n");
   1952 
   1953   if (R->getValue() == UnsetInit::get()) {
   1954     Unset = true;
   1955     return false;
   1956   }
   1957   Unset = false;
   1958   if (BitInit *BI = dyn_cast<BitInit>(R->getValue()))
   1959     return BI->getValue();
   1960   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1961     FieldName + "' does not have a bit initializer!");
   1962 }
   1963 
   1964 /// getValueAsDag - This method looks up the specified field and returns its
   1965 /// value as an Dag, aborting if the field does not exist or if the value is
   1966 /// not the right type.
   1967 ///
   1968 DagInit *Record::getValueAsDag(StringRef FieldName) const {
   1969   const RecordVal *R = getValue(FieldName);
   1970   if (!R || !R->getValue())
   1971     PrintFatalError(getLoc(), "Record `" + getName() +
   1972       "' does not have a field named `" + FieldName + "'!\n");
   1973 
   1974   if (DagInit *DI = dyn_cast<DagInit>(R->getValue()))
   1975     return DI;
   1976   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1977     FieldName + "' does not have a dag initializer!");
   1978 }
   1979 
   1980 
   1981 void MultiClass::dump() const {
   1982   errs() << "Record:\n";
   1983   Rec.dump();
   1984 
   1985   errs() << "Defs:\n";
   1986   for (RecordVector::const_iterator r = DefPrototypes.begin(),
   1987          rend = DefPrototypes.end();
   1988        r != rend;
   1989        ++r) {
   1990     (*r)->dump();
   1991   }
   1992 }
   1993 
   1994 
   1995 void RecordKeeper::dump() const { errs() << *this; }
   1996 
   1997 raw_ostream &llvm::operator<<(raw_ostream &OS, const RecordKeeper &RK) {
   1998   OS << "------------- Classes -----------------\n";
   1999   const std::map<std::string, Record*> &Classes = RK.getClasses();
   2000   for (std::map<std::string, Record*>::const_iterator I = Classes.begin(),
   2001          E = Classes.end(); I != E; ++I)
   2002     OS << "class " << *I->second;
   2003 
   2004   OS << "------------- Defs -----------------\n";
   2005   const std::map<std::string, Record*> &Defs = RK.getDefs();
   2006   for (std::map<std::string, Record*>::const_iterator I = Defs.begin(),
   2007          E = Defs.end(); I != E; ++I)
   2008     OS << "def " << *I->second;
   2009   return OS;
   2010 }
   2011 
   2012 
   2013 /// getAllDerivedDefinitions - This method returns all concrete definitions
   2014 /// that derive from the specified class name.  If a class with the specified
   2015 /// name does not exist, an error is printed and true is returned.
   2016 std::vector<Record*>
   2017 RecordKeeper::getAllDerivedDefinitions(const std::string &ClassName) const {
   2018   Record *Class = getClass(ClassName);
   2019   if (!Class)
   2020     PrintFatalError("ERROR: Couldn't find the `" + ClassName + "' class!\n");
   2021 
   2022   std::vector<Record*> Defs;
   2023   for (std::map<std::string, Record*>::const_iterator I = getDefs().begin(),
   2024          E = getDefs().end(); I != E; ++I)
   2025     if (I->second->isSubClassOf(Class))
   2026       Defs.push_back(I->second);
   2027 
   2028   return Defs;
   2029 }
   2030 
   2031 /// QualifyName - Return an Init with a qualifier prefix referring
   2032 /// to CurRec's name.
   2033 Init *llvm::QualifyName(Record &CurRec, MultiClass *CurMultiClass,
   2034                         Init *Name, const std::string &Scoper) {
   2035   RecTy *Type = dyn_cast<TypedInit>(Name)->getType();
   2036 
   2037   BinOpInit *NewName =
   2038     BinOpInit::get(BinOpInit::STRCONCAT,
   2039                       BinOpInit::get(BinOpInit::STRCONCAT,
   2040                                         CurRec.getNameInit(),
   2041                                         StringInit::get(Scoper),
   2042                                         Type)->Fold(&CurRec, CurMultiClass),
   2043                       Name,
   2044                       Type);
   2045 
   2046   if (CurMultiClass && Scoper != "::") {
   2047     NewName =
   2048       BinOpInit::get(BinOpInit::STRCONCAT,
   2049                         BinOpInit::get(BinOpInit::STRCONCAT,
   2050                                           CurMultiClass->Rec.getNameInit(),
   2051                                           StringInit::get("::"),
   2052                                           Type)->Fold(&CurRec, CurMultiClass),
   2053                         NewName->Fold(&CurRec, CurMultiClass),
   2054                         Type);
   2055   }
   2056 
   2057   return NewName->Fold(&CurRec, CurMultiClass);
   2058 }
   2059 
   2060 /// QualifyName - Return an Init with a qualifier prefix referring
   2061 /// to CurRec's name.
   2062 Init *llvm::QualifyName(Record &CurRec, MultiClass *CurMultiClass,
   2063                         const std::string &Name,
   2064                         const std::string &Scoper) {
   2065   return QualifyName(CurRec, CurMultiClass, StringInit::get(Name), Scoper);
   2066 }
   2067