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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 0; // 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 0;  // 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 0;
    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 0;  // 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 0;
    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 0;
    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 0;
    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 0;
    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 0;
    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 == 0) return 0;
    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 == 0 || R == 0) return 0;
    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 0;
    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 0;
    284 
    285   if (!isa<ListRecTy>(LI->getType()))
    286     return 0;
    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 0;
    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 0;
    309 }
    310 
    311 Init *DagRecTy::convertValue(UnOpInit *BO) {
    312   if (BO->getOpcode() == UnOpInit::CAST) {
    313     Init *L = BO->getOperand()->convertInitializerTo(this);
    314     if (L == 0) return 0;
    315     if (L != BO->getOperand())
    316       return UnOpInit::get(UnOpInit::CAST, L, new DagRecTy);
    317     return BO;
    318   }
    319   return 0;
    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 == 0 || R == 0) return 0;
    327     if (L != BO->getLHS() || R != BO->getRHS())
    328       return BinOpInit::get(BinOpInit::CONCAT, L, R, new DagRecTy);
    329     return BO;
    330   }
    331   return 0;
    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 0;
    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 0;
    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 != 0) {
    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 != 0) {
    413         if (NewType2 != SuperRecTy2) {
    414           delete SuperRecTy2;
    415         }
    416         return NewType2;
    417       }
    418     }
    419   }
    420   return 0;
    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 = 0;
    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 0;
    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 = 0;
    520   Init *CachedBitVar = 0;
    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 IntInit *IntInit::get(int64_t V) {
    561   typedef DenseMap<int64_t, IntInit *> Pool;
    562   static Pool ThePool;
    563 
    564   IntInit *&I = ThePool[V];
    565   if (!I) I = new IntInit(V);
    566   return I;
    567 }
    568 
    569 std::string IntInit::getAsString() const {
    570   return itostr(Value);
    571 }
    572 
    573 Init *
    574 IntInit::convertInitializerBitRange(const std::vector<unsigned> &Bits) const {
    575   SmallVector<Init *, 16> NewBits(Bits.size());
    576 
    577   for (unsigned i = 0, e = Bits.size(); i != e; ++i) {
    578     if (Bits[i] >= 64)
    579       return 0;
    580 
    581     NewBits[i] = BitInit::get(Value & (INT64_C(1) << Bits[i]));
    582   }
    583   return BitsInit::get(NewBits);
    584 }
    585 
    586 void StringInit::anchor() { }
    587 
    588 StringInit *StringInit::get(StringRef V) {
    589   typedef StringMap<StringInit *> Pool;
    590   static Pool ThePool;
    591 
    592   StringInit *&I = ThePool[V];
    593   if (!I) I = new StringInit(V);
    594   return I;
    595 }
    596 
    597 static void ProfileListInit(FoldingSetNodeID &ID,
    598                             ArrayRef<Init *> Range,
    599                             RecTy *EltTy) {
    600   ID.AddInteger(Range.size());
    601   ID.AddPointer(EltTy);
    602 
    603   for (ArrayRef<Init *>::iterator i = Range.begin(),
    604          iend = Range.end();
    605        i != iend;
    606        ++i)
    607     ID.AddPointer(*i);
    608 }
    609 
    610 ListInit *ListInit::get(ArrayRef<Init *> Range, RecTy *EltTy) {
    611   typedef FoldingSet<ListInit> Pool;
    612   static Pool ThePool;
    613 
    614   // Just use the FoldingSetNodeID to compute a hash.  Use a DenseMap
    615   // for actual storage.
    616   FoldingSetNodeID ID;
    617   ProfileListInit(ID, Range, EltTy);
    618 
    619   void *IP = 0;
    620   if (ListInit *I = ThePool.FindNodeOrInsertPos(ID, IP))
    621     return I;
    622 
    623   ListInit *I = new ListInit(Range, EltTy);
    624   ThePool.InsertNode(I, IP);
    625   return I;
    626 }
    627 
    628 void ListInit::Profile(FoldingSetNodeID &ID) const {
    629   ListRecTy *ListType = dyn_cast<ListRecTy>(getType());
    630   assert(ListType && "Bad type for ListInit!");
    631   RecTy *EltTy = ListType->getElementType();
    632 
    633   ProfileListInit(ID, Values, EltTy);
    634 }
    635 
    636 Init *
    637 ListInit::convertInitListSlice(const std::vector<unsigned> &Elements) const {
    638   std::vector<Init*> Vals;
    639   for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
    640     if (Elements[i] >= getSize())
    641       return 0;
    642     Vals.push_back(getElement(Elements[i]));
    643   }
    644   return ListInit::get(Vals, getType());
    645 }
    646 
    647 Record *ListInit::getElementAsRecord(unsigned i) const {
    648   assert(i < Values.size() && "List element index out of range!");
    649   DefInit *DI = dyn_cast<DefInit>(Values[i]);
    650   if (DI == 0)
    651     PrintFatalError("Expected record in list!");
    652   return DI->getDef();
    653 }
    654 
    655 Init *ListInit::resolveReferences(Record &R, const RecordVal *RV) const {
    656   std::vector<Init*> Resolved;
    657   Resolved.reserve(getSize());
    658   bool Changed = false;
    659 
    660   for (unsigned i = 0, e = getSize(); i != e; ++i) {
    661     Init *E;
    662     Init *CurElt = getElement(i);
    663 
    664     do {
    665       E = CurElt;
    666       CurElt = CurElt->resolveReferences(R, RV);
    667       Changed |= E != CurElt;
    668     } while (E != CurElt);
    669     Resolved.push_back(E);
    670   }
    671 
    672   if (Changed)
    673     return ListInit::get(Resolved, getType());
    674   return const_cast<ListInit *>(this);
    675 }
    676 
    677 Init *ListInit::resolveListElementReference(Record &R, const RecordVal *IRV,
    678                                             unsigned Elt) const {
    679   if (Elt >= getSize())
    680     return 0;  // Out of range reference.
    681   Init *E = getElement(Elt);
    682   // If the element is set to some value, or if we are resolving a reference
    683   // to a specific variable and that variable is explicitly unset, then
    684   // replace the VarListElementInit with it.
    685   if (IRV || !isa<UnsetInit>(E))
    686     return E;
    687   return 0;
    688 }
    689 
    690 std::string ListInit::getAsString() const {
    691   std::string Result = "[";
    692   for (unsigned i = 0, e = Values.size(); i != e; ++i) {
    693     if (i) Result += ", ";
    694     Result += Values[i]->getAsString();
    695   }
    696   return Result + "]";
    697 }
    698 
    699 Init *OpInit::resolveListElementReference(Record &R, const RecordVal *IRV,
    700                                           unsigned Elt) const {
    701   Init *Resolved = resolveReferences(R, IRV);
    702   OpInit *OResolved = dyn_cast<OpInit>(Resolved);
    703   if (OResolved) {
    704     Resolved = OResolved->Fold(&R, 0);
    705   }
    706 
    707   if (Resolved != this) {
    708     TypedInit *Typed = dyn_cast<TypedInit>(Resolved);
    709     assert(Typed && "Expected typed init for list reference");
    710     if (Typed) {
    711       Init *New = Typed->resolveListElementReference(R, IRV, Elt);
    712       if (New)
    713         return New;
    714       return VarListElementInit::get(Typed, Elt);
    715     }
    716   }
    717 
    718   return 0;
    719 }
    720 
    721 Init *OpInit::getBit(unsigned Bit) const {
    722   if (getType() == BitRecTy::get())
    723     return const_cast<OpInit*>(this);
    724   return VarBitInit::get(const_cast<OpInit*>(this), Bit);
    725 }
    726 
    727 UnOpInit *UnOpInit::get(UnaryOp opc, Init *lhs, RecTy *Type) {
    728   typedef std::pair<std::pair<unsigned, Init *>, RecTy *> Key;
    729 
    730   typedef DenseMap<Key, UnOpInit *> Pool;
    731   static Pool ThePool;
    732 
    733   Key TheKey(std::make_pair(std::make_pair(opc, lhs), Type));
    734 
    735   UnOpInit *&I = ThePool[TheKey];
    736   if (!I) I = new UnOpInit(opc, lhs, Type);
    737   return I;
    738 }
    739 
    740 Init *UnOpInit::Fold(Record *CurRec, MultiClass *CurMultiClass) const {
    741   switch (getOpcode()) {
    742   case CAST: {
    743     if (getType()->getAsString() == "string") {
    744       if (StringInit *LHSs = dyn_cast<StringInit>(LHS))
    745         return LHSs;
    746 
    747       if (DefInit *LHSd = dyn_cast<DefInit>(LHS))
    748         return StringInit::get(LHSd->getDef()->getName());
    749 
    750       if (IntInit *LHSi = dyn_cast<IntInit>(LHS))
    751         return StringInit::get(LHSi->getAsString());
    752     } else {
    753       if (StringInit *LHSs = dyn_cast<StringInit>(LHS)) {
    754         std::string Name = LHSs->getValue();
    755 
    756         // From TGParser::ParseIDValue
    757         if (CurRec) {
    758           if (const RecordVal *RV = CurRec->getValue(Name)) {
    759             if (RV->getType() != getType())
    760               PrintFatalError("type mismatch in cast");
    761             return VarInit::get(Name, RV->getType());
    762           }
    763 
    764           Init *TemplateArgName = QualifyName(*CurRec, CurMultiClass, Name,
    765                                               ":");
    766 
    767           if (CurRec->isTemplateArg(TemplateArgName)) {
    768             const RecordVal *RV = CurRec->getValue(TemplateArgName);
    769             assert(RV && "Template arg doesn't exist??");
    770 
    771             if (RV->getType() != getType())
    772               PrintFatalError("type mismatch in cast");
    773 
    774             return VarInit::get(TemplateArgName, RV->getType());
    775           }
    776         }
    777 
    778         if (CurMultiClass) {
    779           Init *MCName = QualifyName(CurMultiClass->Rec, CurMultiClass, Name, "::");
    780 
    781           if (CurMultiClass->Rec.isTemplateArg(MCName)) {
    782             const RecordVal *RV = CurMultiClass->Rec.getValue(MCName);
    783             assert(RV && "Template arg doesn't exist??");
    784 
    785             if (RV->getType() != getType())
    786               PrintFatalError("type mismatch in cast");
    787 
    788             return VarInit::get(MCName, RV->getType());
    789           }
    790         }
    791 
    792         if (Record *D = (CurRec->getRecords()).getDef(Name))
    793           return DefInit::get(D);
    794 
    795         PrintFatalError(CurRec->getLoc(),
    796                         "Undefined reference:'" + Name + "'\n");
    797       }
    798     }
    799     break;
    800   }
    801   case HEAD: {
    802     if (ListInit *LHSl = dyn_cast<ListInit>(LHS)) {
    803       if (LHSl->getSize() == 0) {
    804         assert(0 && "Empty list in car");
    805         return 0;
    806       }
    807       return LHSl->getElement(0);
    808     }
    809     break;
    810   }
    811   case TAIL: {
    812     if (ListInit *LHSl = dyn_cast<ListInit>(LHS)) {
    813       if (LHSl->getSize() == 0) {
    814         assert(0 && "Empty list in cdr");
    815         return 0;
    816       }
    817       // Note the +1.  We can't just pass the result of getValues()
    818       // directly.
    819       ArrayRef<Init *>::iterator begin = LHSl->getValues().begin()+1;
    820       ArrayRef<Init *>::iterator end   = LHSl->getValues().end();
    821       ListInit *Result =
    822         ListInit::get(ArrayRef<Init *>(begin, end - begin),
    823                       LHSl->getType());
    824       return Result;
    825     }
    826     break;
    827   }
    828   case EMPTY: {
    829     if (ListInit *LHSl = dyn_cast<ListInit>(LHS)) {
    830       if (LHSl->getSize() == 0) {
    831         return IntInit::get(1);
    832       } else {
    833         return IntInit::get(0);
    834       }
    835     }
    836     if (StringInit *LHSs = dyn_cast<StringInit>(LHS)) {
    837       if (LHSs->getValue().empty()) {
    838         return IntInit::get(1);
    839       } else {
    840         return IntInit::get(0);
    841       }
    842     }
    843 
    844     break;
    845   }
    846   }
    847   return const_cast<UnOpInit *>(this);
    848 }
    849 
    850 Init *UnOpInit::resolveReferences(Record &R, const RecordVal *RV) const {
    851   Init *lhs = LHS->resolveReferences(R, RV);
    852 
    853   if (LHS != lhs)
    854     return (UnOpInit::get(getOpcode(), lhs, getType()))->Fold(&R, 0);
    855   return Fold(&R, 0);
    856 }
    857 
    858 std::string UnOpInit::getAsString() const {
    859   std::string Result;
    860   switch (Opc) {
    861   case CAST: Result = "!cast<" + getType()->getAsString() + ">"; break;
    862   case HEAD: Result = "!head"; break;
    863   case TAIL: Result = "!tail"; break;
    864   case EMPTY: Result = "!empty"; break;
    865   }
    866   return Result + "(" + LHS->getAsString() + ")";
    867 }
    868 
    869 BinOpInit *BinOpInit::get(BinaryOp opc, Init *lhs,
    870                           Init *rhs, RecTy *Type) {
    871   typedef std::pair<
    872     std::pair<std::pair<unsigned, Init *>, Init *>,
    873     RecTy *
    874     > Key;
    875 
    876   typedef DenseMap<Key, BinOpInit *> Pool;
    877   static Pool ThePool;
    878 
    879   Key TheKey(std::make_pair(std::make_pair(std::make_pair(opc, lhs), rhs),
    880                             Type));
    881 
    882   BinOpInit *&I = ThePool[TheKey];
    883   if (!I) I = new BinOpInit(opc, lhs, rhs, Type);
    884   return I;
    885 }
    886 
    887 Init *BinOpInit::Fold(Record *CurRec, MultiClass *CurMultiClass) const {
    888   switch (getOpcode()) {
    889   case CONCAT: {
    890     DagInit *LHSs = dyn_cast<DagInit>(LHS);
    891     DagInit *RHSs = dyn_cast<DagInit>(RHS);
    892     if (LHSs && RHSs) {
    893       DefInit *LOp = dyn_cast<DefInit>(LHSs->getOperator());
    894       DefInit *ROp = dyn_cast<DefInit>(RHSs->getOperator());
    895       if (LOp == 0 || ROp == 0 || LOp->getDef() != ROp->getDef())
    896         PrintFatalError("Concated Dag operators do not match!");
    897       std::vector<Init*> Args;
    898       std::vector<std::string> ArgNames;
    899       for (unsigned i = 0, e = LHSs->getNumArgs(); i != e; ++i) {
    900         Args.push_back(LHSs->getArg(i));
    901         ArgNames.push_back(LHSs->getArgName(i));
    902       }
    903       for (unsigned i = 0, e = RHSs->getNumArgs(); i != e; ++i) {
    904         Args.push_back(RHSs->getArg(i));
    905         ArgNames.push_back(RHSs->getArgName(i));
    906       }
    907       return DagInit::get(LHSs->getOperator(), "", Args, ArgNames);
    908     }
    909     break;
    910   }
    911   case STRCONCAT: {
    912     StringInit *LHSs = dyn_cast<StringInit>(LHS);
    913     StringInit *RHSs = dyn_cast<StringInit>(RHS);
    914     if (LHSs && RHSs)
    915       return StringInit::get(LHSs->getValue() + RHSs->getValue());
    916     break;
    917   }
    918   case EQ: {
    919     // try to fold eq comparison for 'bit' and 'int', otherwise fallback
    920     // to string objects.
    921     IntInit *L =
    922       dyn_cast_or_null<IntInit>(LHS->convertInitializerTo(IntRecTy::get()));
    923     IntInit *R =
    924       dyn_cast_or_null<IntInit>(RHS->convertInitializerTo(IntRecTy::get()));
    925 
    926     if (L && R)
    927       return IntInit::get(L->getValue() == R->getValue());
    928 
    929     StringInit *LHSs = dyn_cast<StringInit>(LHS);
    930     StringInit *RHSs = dyn_cast<StringInit>(RHS);
    931 
    932     // Make sure we've resolved
    933     if (LHSs && RHSs)
    934       return IntInit::get(LHSs->getValue() == RHSs->getValue());
    935 
    936     break;
    937   }
    938   case ADD:
    939   case SHL:
    940   case SRA:
    941   case SRL: {
    942     IntInit *LHSi = dyn_cast<IntInit>(LHS);
    943     IntInit *RHSi = dyn_cast<IntInit>(RHS);
    944     if (LHSi && RHSi) {
    945       int64_t LHSv = LHSi->getValue(), RHSv = RHSi->getValue();
    946       int64_t Result;
    947       switch (getOpcode()) {
    948       default: llvm_unreachable("Bad opcode!");
    949       case ADD: Result = LHSv +  RHSv; break;
    950       case SHL: Result = LHSv << RHSv; break;
    951       case SRA: Result = LHSv >> RHSv; break;
    952       case SRL: Result = (uint64_t)LHSv >> (uint64_t)RHSv; break;
    953       }
    954       return IntInit::get(Result);
    955     }
    956     break;
    957   }
    958   }
    959   return const_cast<BinOpInit *>(this);
    960 }
    961 
    962 Init *BinOpInit::resolveReferences(Record &R, const RecordVal *RV) const {
    963   Init *lhs = LHS->resolveReferences(R, RV);
    964   Init *rhs = RHS->resolveReferences(R, RV);
    965 
    966   if (LHS != lhs || RHS != rhs)
    967     return (BinOpInit::get(getOpcode(), lhs, rhs, getType()))->Fold(&R, 0);
    968   return Fold(&R, 0);
    969 }
    970 
    971 std::string BinOpInit::getAsString() const {
    972   std::string Result;
    973   switch (Opc) {
    974   case CONCAT: Result = "!con"; break;
    975   case ADD: Result = "!add"; break;
    976   case SHL: Result = "!shl"; break;
    977   case SRA: Result = "!sra"; break;
    978   case SRL: Result = "!srl"; break;
    979   case EQ: Result = "!eq"; break;
    980   case STRCONCAT: Result = "!strconcat"; break;
    981   }
    982   return Result + "(" + LHS->getAsString() + ", " + RHS->getAsString() + ")";
    983 }
    984 
    985 TernOpInit *TernOpInit::get(TernaryOp opc, Init *lhs,
    986                                   Init *mhs, Init *rhs,
    987                                   RecTy *Type) {
    988   typedef std::pair<
    989     std::pair<
    990       std::pair<std::pair<unsigned, RecTy *>, Init *>,
    991       Init *
    992       >,
    993     Init *
    994     > Key;
    995 
    996   typedef DenseMap<Key, TernOpInit *> Pool;
    997   static Pool ThePool;
    998 
    999   Key TheKey(std::make_pair(std::make_pair(std::make_pair(std::make_pair(opc,
   1000                                                                          Type),
   1001                                                           lhs),
   1002                                            mhs),
   1003                             rhs));
   1004 
   1005   TernOpInit *&I = ThePool[TheKey];
   1006   if (!I) I = new TernOpInit(opc, lhs, mhs, rhs, Type);
   1007   return I;
   1008 }
   1009 
   1010 static Init *ForeachHelper(Init *LHS, Init *MHS, Init *RHS, RecTy *Type,
   1011                            Record *CurRec, MultiClass *CurMultiClass);
   1012 
   1013 static Init *EvaluateOperation(OpInit *RHSo, Init *LHS, Init *Arg,
   1014                                RecTy *Type, Record *CurRec,
   1015                                MultiClass *CurMultiClass) {
   1016   std::vector<Init *> NewOperands;
   1017 
   1018   TypedInit *TArg = dyn_cast<TypedInit>(Arg);
   1019 
   1020   // If this is a dag, recurse
   1021   if (TArg && TArg->getType()->getAsString() == "dag") {
   1022     Init *Result = ForeachHelper(LHS, Arg, RHSo, Type,
   1023                                  CurRec, CurMultiClass);
   1024     if (Result != 0) {
   1025       return Result;
   1026     } else {
   1027       return 0;
   1028     }
   1029   }
   1030 
   1031   for (int i = 0; i < RHSo->getNumOperands(); ++i) {
   1032     OpInit *RHSoo = dyn_cast<OpInit>(RHSo->getOperand(i));
   1033 
   1034     if (RHSoo) {
   1035       Init *Result = EvaluateOperation(RHSoo, LHS, Arg,
   1036                                        Type, CurRec, CurMultiClass);
   1037       if (Result != 0) {
   1038         NewOperands.push_back(Result);
   1039       } else {
   1040         NewOperands.push_back(Arg);
   1041       }
   1042     } else if (LHS->getAsString() == RHSo->getOperand(i)->getAsString()) {
   1043       NewOperands.push_back(Arg);
   1044     } else {
   1045       NewOperands.push_back(RHSo->getOperand(i));
   1046     }
   1047   }
   1048 
   1049   // Now run the operator and use its result as the new leaf
   1050   const OpInit *NewOp = RHSo->clone(NewOperands);
   1051   Init *NewVal = NewOp->Fold(CurRec, CurMultiClass);
   1052   if (NewVal != NewOp)
   1053     return NewVal;
   1054 
   1055   return 0;
   1056 }
   1057 
   1058 static Init *ForeachHelper(Init *LHS, Init *MHS, Init *RHS, RecTy *Type,
   1059                            Record *CurRec, MultiClass *CurMultiClass) {
   1060   DagInit *MHSd = dyn_cast<DagInit>(MHS);
   1061   ListInit *MHSl = dyn_cast<ListInit>(MHS);
   1062 
   1063   OpInit *RHSo = dyn_cast<OpInit>(RHS);
   1064 
   1065   if (!RHSo) {
   1066     PrintFatalError(CurRec->getLoc(), "!foreach requires an operator\n");
   1067   }
   1068 
   1069   TypedInit *LHSt = dyn_cast<TypedInit>(LHS);
   1070 
   1071   if (!LHSt)
   1072     PrintFatalError(CurRec->getLoc(), "!foreach requires typed variable\n");
   1073 
   1074   if ((MHSd && isa<DagRecTy>(Type)) || (MHSl && isa<ListRecTy>(Type))) {
   1075     if (MHSd) {
   1076       Init *Val = MHSd->getOperator();
   1077       Init *Result = EvaluateOperation(RHSo, LHS, Val,
   1078                                        Type, CurRec, CurMultiClass);
   1079       if (Result != 0) {
   1080         Val = Result;
   1081       }
   1082 
   1083       std::vector<std::pair<Init *, std::string> > args;
   1084       for (unsigned int i = 0; i < MHSd->getNumArgs(); ++i) {
   1085         Init *Arg;
   1086         std::string ArgName;
   1087         Arg = MHSd->getArg(i);
   1088         ArgName = MHSd->getArgName(i);
   1089 
   1090         // Process args
   1091         Init *Result = EvaluateOperation(RHSo, LHS, Arg, Type,
   1092                                          CurRec, CurMultiClass);
   1093         if (Result != 0) {
   1094           Arg = Result;
   1095         }
   1096 
   1097         // TODO: Process arg names
   1098         args.push_back(std::make_pair(Arg, ArgName));
   1099       }
   1100 
   1101       return DagInit::get(Val, "", args);
   1102     }
   1103     if (MHSl) {
   1104       std::vector<Init *> NewOperands;
   1105       std::vector<Init *> NewList(MHSl->begin(), MHSl->end());
   1106 
   1107       for (std::vector<Init *>::iterator li = NewList.begin(),
   1108              liend = NewList.end();
   1109            li != liend;
   1110            ++li) {
   1111         Init *Item = *li;
   1112         NewOperands.clear();
   1113         for(int i = 0; i < RHSo->getNumOperands(); ++i) {
   1114           // First, replace the foreach variable with the list item
   1115           if (LHS->getAsString() == RHSo->getOperand(i)->getAsString()) {
   1116             NewOperands.push_back(Item);
   1117           } else {
   1118             NewOperands.push_back(RHSo->getOperand(i));
   1119           }
   1120         }
   1121 
   1122         // Now run the operator and use its result as the new list item
   1123         const OpInit *NewOp = RHSo->clone(NewOperands);
   1124         Init *NewItem = NewOp->Fold(CurRec, CurMultiClass);
   1125         if (NewItem != NewOp)
   1126           *li = NewItem;
   1127       }
   1128       return ListInit::get(NewList, MHSl->getType());
   1129     }
   1130   }
   1131   return 0;
   1132 }
   1133 
   1134 Init *TernOpInit::Fold(Record *CurRec, MultiClass *CurMultiClass) const {
   1135   switch (getOpcode()) {
   1136   case SUBST: {
   1137     DefInit *LHSd = dyn_cast<DefInit>(LHS);
   1138     VarInit *LHSv = dyn_cast<VarInit>(LHS);
   1139     StringInit *LHSs = dyn_cast<StringInit>(LHS);
   1140 
   1141     DefInit *MHSd = dyn_cast<DefInit>(MHS);
   1142     VarInit *MHSv = dyn_cast<VarInit>(MHS);
   1143     StringInit *MHSs = dyn_cast<StringInit>(MHS);
   1144 
   1145     DefInit *RHSd = dyn_cast<DefInit>(RHS);
   1146     VarInit *RHSv = dyn_cast<VarInit>(RHS);
   1147     StringInit *RHSs = dyn_cast<StringInit>(RHS);
   1148 
   1149     if ((LHSd && MHSd && RHSd)
   1150         || (LHSv && MHSv && RHSv)
   1151         || (LHSs && MHSs && RHSs)) {
   1152       if (RHSd) {
   1153         Record *Val = RHSd->getDef();
   1154         if (LHSd->getAsString() == RHSd->getAsString()) {
   1155           Val = MHSd->getDef();
   1156         }
   1157         return DefInit::get(Val);
   1158       }
   1159       if (RHSv) {
   1160         std::string Val = RHSv->getName();
   1161         if (LHSv->getAsString() == RHSv->getAsString()) {
   1162           Val = MHSv->getName();
   1163         }
   1164         return VarInit::get(Val, getType());
   1165       }
   1166       if (RHSs) {
   1167         std::string Val = RHSs->getValue();
   1168 
   1169         std::string::size_type found;
   1170         std::string::size_type idx = 0;
   1171         do {
   1172           found = Val.find(LHSs->getValue(), idx);
   1173           if (found != std::string::npos) {
   1174             Val.replace(found, LHSs->getValue().size(), MHSs->getValue());
   1175           }
   1176           idx = found +  MHSs->getValue().size();
   1177         } while (found != std::string::npos);
   1178 
   1179         return StringInit::get(Val);
   1180       }
   1181     }
   1182     break;
   1183   }
   1184 
   1185   case FOREACH: {
   1186     Init *Result = ForeachHelper(LHS, MHS, RHS, getType(),
   1187                                  CurRec, CurMultiClass);
   1188     if (Result != 0) {
   1189       return Result;
   1190     }
   1191     break;
   1192   }
   1193 
   1194   case IF: {
   1195     IntInit *LHSi = dyn_cast<IntInit>(LHS);
   1196     if (Init *I = LHS->convertInitializerTo(IntRecTy::get()))
   1197       LHSi = dyn_cast<IntInit>(I);
   1198     if (LHSi) {
   1199       if (LHSi->getValue()) {
   1200         return MHS;
   1201       } else {
   1202         return RHS;
   1203       }
   1204     }
   1205     break;
   1206   }
   1207   }
   1208 
   1209   return const_cast<TernOpInit *>(this);
   1210 }
   1211 
   1212 Init *TernOpInit::resolveReferences(Record &R,
   1213                                     const RecordVal *RV) const {
   1214   Init *lhs = LHS->resolveReferences(R, RV);
   1215 
   1216   if (Opc == IF && lhs != LHS) {
   1217     IntInit *Value = dyn_cast<IntInit>(lhs);
   1218     if (Init *I = lhs->convertInitializerTo(IntRecTy::get()))
   1219       Value = dyn_cast<IntInit>(I);
   1220     if (Value != 0) {
   1221       // Short-circuit
   1222       if (Value->getValue()) {
   1223         Init *mhs = MHS->resolveReferences(R, RV);
   1224         return (TernOpInit::get(getOpcode(), lhs, mhs,
   1225                                 RHS, getType()))->Fold(&R, 0);
   1226       } else {
   1227         Init *rhs = RHS->resolveReferences(R, RV);
   1228         return (TernOpInit::get(getOpcode(), lhs, MHS,
   1229                                 rhs, getType()))->Fold(&R, 0);
   1230       }
   1231     }
   1232   }
   1233 
   1234   Init *mhs = MHS->resolveReferences(R, RV);
   1235   Init *rhs = RHS->resolveReferences(R, RV);
   1236 
   1237   if (LHS != lhs || MHS != mhs || RHS != rhs)
   1238     return (TernOpInit::get(getOpcode(), lhs, mhs, rhs,
   1239                             getType()))->Fold(&R, 0);
   1240   return Fold(&R, 0);
   1241 }
   1242 
   1243 std::string TernOpInit::getAsString() const {
   1244   std::string Result;
   1245   switch (Opc) {
   1246   case SUBST: Result = "!subst"; break;
   1247   case FOREACH: Result = "!foreach"; break;
   1248   case IF: Result = "!if"; break;
   1249  }
   1250   return Result + "(" + LHS->getAsString() + ", " + MHS->getAsString() + ", "
   1251     + RHS->getAsString() + ")";
   1252 }
   1253 
   1254 RecTy *TypedInit::getFieldType(const std::string &FieldName) const {
   1255   if (RecordRecTy *RecordType = dyn_cast<RecordRecTy>(getType()))
   1256     if (RecordVal *Field = RecordType->getRecord()->getValue(FieldName))
   1257       return Field->getType();
   1258   return 0;
   1259 }
   1260 
   1261 Init *
   1262 TypedInit::convertInitializerBitRange(const std::vector<unsigned> &Bits) const {
   1263   BitsRecTy *T = dyn_cast<BitsRecTy>(getType());
   1264   if (T == 0) return 0;  // Cannot subscript a non-bits variable.
   1265   unsigned NumBits = T->getNumBits();
   1266 
   1267   SmallVector<Init *, 16> NewBits(Bits.size());
   1268   for (unsigned i = 0, e = Bits.size(); i != e; ++i) {
   1269     if (Bits[i] >= NumBits)
   1270       return 0;
   1271 
   1272     NewBits[i] = VarBitInit::get(const_cast<TypedInit *>(this), Bits[i]);
   1273   }
   1274   return BitsInit::get(NewBits);
   1275 }
   1276 
   1277 Init *
   1278 TypedInit::convertInitListSlice(const std::vector<unsigned> &Elements) const {
   1279   ListRecTy *T = dyn_cast<ListRecTy>(getType());
   1280   if (T == 0) return 0;  // Cannot subscript a non-list variable.
   1281 
   1282   if (Elements.size() == 1)
   1283     return VarListElementInit::get(const_cast<TypedInit *>(this), Elements[0]);
   1284 
   1285   std::vector<Init*> ListInits;
   1286   ListInits.reserve(Elements.size());
   1287   for (unsigned i = 0, e = Elements.size(); i != e; ++i)
   1288     ListInits.push_back(VarListElementInit::get(const_cast<TypedInit *>(this),
   1289                                                 Elements[i]));
   1290   return ListInit::get(ListInits, T);
   1291 }
   1292 
   1293 
   1294 VarInit *VarInit::get(const std::string &VN, RecTy *T) {
   1295   Init *Value = StringInit::get(VN);
   1296   return VarInit::get(Value, T);
   1297 }
   1298 
   1299 VarInit *VarInit::get(Init *VN, RecTy *T) {
   1300   typedef std::pair<RecTy *, Init *> Key;
   1301   typedef DenseMap<Key, VarInit *> Pool;
   1302   static Pool ThePool;
   1303 
   1304   Key TheKey(std::make_pair(T, VN));
   1305 
   1306   VarInit *&I = ThePool[TheKey];
   1307   if (!I) I = new VarInit(VN, T);
   1308   return I;
   1309 }
   1310 
   1311 const std::string &VarInit::getName() const {
   1312   StringInit *NameString = dyn_cast<StringInit>(getNameInit());
   1313   assert(NameString && "VarInit name is not a string!");
   1314   return NameString->getValue();
   1315 }
   1316 
   1317 Init *VarInit::getBit(unsigned Bit) const {
   1318   if (getType() == BitRecTy::get())
   1319     return const_cast<VarInit*>(this);
   1320   return VarBitInit::get(const_cast<VarInit*>(this), Bit);
   1321 }
   1322 
   1323 Init *VarInit::resolveListElementReference(Record &R,
   1324                                            const RecordVal *IRV,
   1325                                            unsigned Elt) const {
   1326   if (R.isTemplateArg(getNameInit())) return 0;
   1327   if (IRV && IRV->getNameInit() != getNameInit()) return 0;
   1328 
   1329   RecordVal *RV = R.getValue(getNameInit());
   1330   assert(RV && "Reference to a non-existent variable?");
   1331   ListInit *LI = dyn_cast<ListInit>(RV->getValue());
   1332   if (!LI) {
   1333     TypedInit *VI = dyn_cast<TypedInit>(RV->getValue());
   1334     assert(VI && "Invalid list element!");
   1335     return VarListElementInit::get(VI, Elt);
   1336   }
   1337 
   1338   if (Elt >= LI->getSize())
   1339     return 0;  // Out of range reference.
   1340   Init *E = LI->getElement(Elt);
   1341   // If the element is set to some value, or if we are resolving a reference
   1342   // to a specific variable and that variable is explicitly unset, then
   1343   // replace the VarListElementInit with it.
   1344   if (IRV || !isa<UnsetInit>(E))
   1345     return E;
   1346   return 0;
   1347 }
   1348 
   1349 
   1350 RecTy *VarInit::getFieldType(const std::string &FieldName) const {
   1351   if (RecordRecTy *RTy = dyn_cast<RecordRecTy>(getType()))
   1352     if (const RecordVal *RV = RTy->getRecord()->getValue(FieldName))
   1353       return RV->getType();
   1354   return 0;
   1355 }
   1356 
   1357 Init *VarInit::getFieldInit(Record &R, const RecordVal *RV,
   1358                             const std::string &FieldName) const {
   1359   if (isa<RecordRecTy>(getType()))
   1360     if (const RecordVal *Val = R.getValue(VarName)) {
   1361       if (RV != Val && (RV || isa<UnsetInit>(Val->getValue())))
   1362         return 0;
   1363       Init *TheInit = Val->getValue();
   1364       assert(TheInit != this && "Infinite loop detected!");
   1365       if (Init *I = TheInit->getFieldInit(R, RV, FieldName))
   1366         return I;
   1367       else
   1368         return 0;
   1369     }
   1370   return 0;
   1371 }
   1372 
   1373 /// resolveReferences - This method is used by classes that refer to other
   1374 /// variables which may not be defined at the time the expression is formed.
   1375 /// If a value is set for the variable later, this method will be called on
   1376 /// users of the value to allow the value to propagate out.
   1377 ///
   1378 Init *VarInit::resolveReferences(Record &R, const RecordVal *RV) const {
   1379   if (RecordVal *Val = R.getValue(VarName))
   1380     if (RV == Val || (RV == 0 && !isa<UnsetInit>(Val->getValue())))
   1381       return Val->getValue();
   1382   return const_cast<VarInit *>(this);
   1383 }
   1384 
   1385 VarBitInit *VarBitInit::get(TypedInit *T, unsigned B) {
   1386   typedef std::pair<TypedInit *, unsigned> Key;
   1387   typedef DenseMap<Key, VarBitInit *> Pool;
   1388 
   1389   static Pool ThePool;
   1390 
   1391   Key TheKey(std::make_pair(T, B));
   1392 
   1393   VarBitInit *&I = ThePool[TheKey];
   1394   if (!I) I = new VarBitInit(T, B);
   1395   return I;
   1396 }
   1397 
   1398 std::string VarBitInit::getAsString() const {
   1399    return TI->getAsString() + "{" + utostr(Bit) + "}";
   1400 }
   1401 
   1402 Init *VarBitInit::resolveReferences(Record &R, const RecordVal *RV) const {
   1403   Init *I = TI->resolveReferences(R, RV);
   1404   if (TI != I)
   1405     return I->getBit(getBitNum());
   1406 
   1407   return const_cast<VarBitInit*>(this);
   1408 }
   1409 
   1410 VarListElementInit *VarListElementInit::get(TypedInit *T,
   1411                                             unsigned E) {
   1412   typedef std::pair<TypedInit *, unsigned> Key;
   1413   typedef DenseMap<Key, VarListElementInit *> Pool;
   1414 
   1415   static Pool ThePool;
   1416 
   1417   Key TheKey(std::make_pair(T, E));
   1418 
   1419   VarListElementInit *&I = ThePool[TheKey];
   1420   if (!I) I = new VarListElementInit(T, E);
   1421   return I;
   1422 }
   1423 
   1424 std::string VarListElementInit::getAsString() const {
   1425   return TI->getAsString() + "[" + utostr(Element) + "]";
   1426 }
   1427 
   1428 Init *
   1429 VarListElementInit::resolveReferences(Record &R, const RecordVal *RV) const {
   1430   if (Init *I = getVariable()->resolveListElementReference(R, RV,
   1431                                                            getElementNum()))
   1432     return I;
   1433   return const_cast<VarListElementInit *>(this);
   1434 }
   1435 
   1436 Init *VarListElementInit::getBit(unsigned Bit) const {
   1437   if (getType() == BitRecTy::get())
   1438     return const_cast<VarListElementInit*>(this);
   1439   return VarBitInit::get(const_cast<VarListElementInit*>(this), Bit);
   1440 }
   1441 
   1442 Init *VarListElementInit:: resolveListElementReference(Record &R,
   1443                                                        const RecordVal *RV,
   1444                                                        unsigned Elt) const {
   1445   Init *Result = TI->resolveListElementReference(R, RV, Element);
   1446 
   1447   if (Result) {
   1448     if (TypedInit *TInit = dyn_cast<TypedInit>(Result)) {
   1449       Init *Result2 = TInit->resolveListElementReference(R, RV, Elt);
   1450       if (Result2) return Result2;
   1451       return new VarListElementInit(TInit, Elt);
   1452     }
   1453     return Result;
   1454   }
   1455 
   1456   return 0;
   1457 }
   1458 
   1459 DefInit *DefInit::get(Record *R) {
   1460   return R->getDefInit();
   1461 }
   1462 
   1463 RecTy *DefInit::getFieldType(const std::string &FieldName) const {
   1464   if (const RecordVal *RV = Def->getValue(FieldName))
   1465     return RV->getType();
   1466   return 0;
   1467 }
   1468 
   1469 Init *DefInit::getFieldInit(Record &R, const RecordVal *RV,
   1470                             const std::string &FieldName) const {
   1471   return Def->getValue(FieldName)->getValue();
   1472 }
   1473 
   1474 
   1475 std::string DefInit::getAsString() const {
   1476   return Def->getName();
   1477 }
   1478 
   1479 FieldInit *FieldInit::get(Init *R, const std::string &FN) {
   1480   typedef std::pair<Init *, TableGenStringKey> Key;
   1481   typedef DenseMap<Key, FieldInit *> Pool;
   1482   static Pool ThePool;
   1483 
   1484   Key TheKey(std::make_pair(R, FN));
   1485 
   1486   FieldInit *&I = ThePool[TheKey];
   1487   if (!I) I = new FieldInit(R, FN);
   1488   return I;
   1489 }
   1490 
   1491 Init *FieldInit::getBit(unsigned Bit) const {
   1492   if (getType() == BitRecTy::get())
   1493     return const_cast<FieldInit*>(this);
   1494   return VarBitInit::get(const_cast<FieldInit*>(this), Bit);
   1495 }
   1496 
   1497 Init *FieldInit::resolveListElementReference(Record &R, const RecordVal *RV,
   1498                                              unsigned Elt) const {
   1499   if (Init *ListVal = Rec->getFieldInit(R, RV, FieldName))
   1500     if (ListInit *LI = dyn_cast<ListInit>(ListVal)) {
   1501       if (Elt >= LI->getSize()) return 0;
   1502       Init *E = LI->getElement(Elt);
   1503 
   1504       // If the element is set to some value, or if we are resolving a
   1505       // reference to a specific variable and that variable is explicitly
   1506       // unset, then replace the VarListElementInit with it.
   1507       if (RV || !isa<UnsetInit>(E))
   1508         return E;
   1509     }
   1510   return 0;
   1511 }
   1512 
   1513 Init *FieldInit::resolveReferences(Record &R, const RecordVal *RV) const {
   1514   Init *NewRec = RV ? Rec->resolveReferences(R, RV) : Rec;
   1515 
   1516   Init *BitsVal = NewRec->getFieldInit(R, RV, FieldName);
   1517   if (BitsVal) {
   1518     Init *BVR = BitsVal->resolveReferences(R, RV);
   1519     return BVR->isComplete() ? BVR : const_cast<FieldInit *>(this);
   1520   }
   1521 
   1522   if (NewRec != Rec) {
   1523     return FieldInit::get(NewRec, FieldName);
   1524   }
   1525   return const_cast<FieldInit *>(this);
   1526 }
   1527 
   1528 static void ProfileDagInit(FoldingSetNodeID &ID, Init *V, const std::string &VN,
   1529                            ArrayRef<Init *> ArgRange,
   1530                            ArrayRef<std::string> NameRange) {
   1531   ID.AddPointer(V);
   1532   ID.AddString(VN);
   1533 
   1534   ArrayRef<Init *>::iterator Arg  = ArgRange.begin();
   1535   ArrayRef<std::string>::iterator  Name = NameRange.begin();
   1536   while (Arg != ArgRange.end()) {
   1537     assert(Name != NameRange.end() && "Arg name underflow!");
   1538     ID.AddPointer(*Arg++);
   1539     ID.AddString(*Name++);
   1540   }
   1541   assert(Name == NameRange.end() && "Arg name overflow!");
   1542 }
   1543 
   1544 DagInit *
   1545 DagInit::get(Init *V, const std::string &VN,
   1546              ArrayRef<Init *> ArgRange,
   1547              ArrayRef<std::string> NameRange) {
   1548   typedef FoldingSet<DagInit> Pool;
   1549   static Pool ThePool;
   1550 
   1551   FoldingSetNodeID ID;
   1552   ProfileDagInit(ID, V, VN, ArgRange, NameRange);
   1553 
   1554   void *IP = 0;
   1555   if (DagInit *I = ThePool.FindNodeOrInsertPos(ID, IP))
   1556     return I;
   1557 
   1558   DagInit *I = new DagInit(V, VN, ArgRange, NameRange);
   1559   ThePool.InsertNode(I, IP);
   1560 
   1561   return I;
   1562 }
   1563 
   1564 DagInit *
   1565 DagInit::get(Init *V, const std::string &VN,
   1566              const std::vector<std::pair<Init*, std::string> > &args) {
   1567   typedef std::pair<Init*, std::string> PairType;
   1568 
   1569   std::vector<Init *> Args;
   1570   std::vector<std::string> Names;
   1571 
   1572   for (std::vector<PairType>::const_iterator i = args.begin(),
   1573          iend = args.end();
   1574        i != iend;
   1575        ++i) {
   1576     Args.push_back(i->first);
   1577     Names.push_back(i->second);
   1578   }
   1579 
   1580   return DagInit::get(V, VN, Args, Names);
   1581 }
   1582 
   1583 void DagInit::Profile(FoldingSetNodeID &ID) const {
   1584   ProfileDagInit(ID, Val, ValName, Args, ArgNames);
   1585 }
   1586 
   1587 Init *DagInit::resolveReferences(Record &R, const RecordVal *RV) const {
   1588   std::vector<Init*> NewArgs;
   1589   for (unsigned i = 0, e = Args.size(); i != e; ++i)
   1590     NewArgs.push_back(Args[i]->resolveReferences(R, RV));
   1591 
   1592   Init *Op = Val->resolveReferences(R, RV);
   1593 
   1594   if (Args != NewArgs || Op != Val)
   1595     return DagInit::get(Op, ValName, NewArgs, ArgNames);
   1596 
   1597   return const_cast<DagInit *>(this);
   1598 }
   1599 
   1600 
   1601 std::string DagInit::getAsString() const {
   1602   std::string Result = "(" + Val->getAsString();
   1603   if (!ValName.empty())
   1604     Result += ":" + ValName;
   1605   if (Args.size()) {
   1606     Result += " " + Args[0]->getAsString();
   1607     if (!ArgNames[0].empty()) Result += ":$" + ArgNames[0];
   1608     for (unsigned i = 1, e = Args.size(); i != e; ++i) {
   1609       Result += ", " + Args[i]->getAsString();
   1610       if (!ArgNames[i].empty()) Result += ":$" + ArgNames[i];
   1611     }
   1612   }
   1613   return Result + ")";
   1614 }
   1615 
   1616 
   1617 //===----------------------------------------------------------------------===//
   1618 //    Other implementations
   1619 //===----------------------------------------------------------------------===//
   1620 
   1621 RecordVal::RecordVal(Init *N, RecTy *T, unsigned P)
   1622   : Name(N), Ty(T), Prefix(P) {
   1623   Value = Ty->convertValue(UnsetInit::get());
   1624   assert(Value && "Cannot create unset value for current type!");
   1625 }
   1626 
   1627 RecordVal::RecordVal(const std::string &N, RecTy *T, unsigned P)
   1628   : Name(StringInit::get(N)), Ty(T), Prefix(P) {
   1629   Value = Ty->convertValue(UnsetInit::get());
   1630   assert(Value && "Cannot create unset value for current type!");
   1631 }
   1632 
   1633 const std::string &RecordVal::getName() const {
   1634   StringInit *NameString = dyn_cast<StringInit>(Name);
   1635   assert(NameString && "RecordVal name is not a string!");
   1636   return NameString->getValue();
   1637 }
   1638 
   1639 void RecordVal::dump() const { errs() << *this; }
   1640 
   1641 void RecordVal::print(raw_ostream &OS, bool PrintSem) const {
   1642   if (getPrefix()) OS << "field ";
   1643   OS << *getType() << " " << getNameInitAsString();
   1644 
   1645   if (getValue())
   1646     OS << " = " << *getValue();
   1647 
   1648   if (PrintSem) OS << ";\n";
   1649 }
   1650 
   1651 unsigned Record::LastID = 0;
   1652 
   1653 void Record::init() {
   1654   checkName();
   1655 
   1656   // Every record potentially has a def at the top.  This value is
   1657   // replaced with the top-level def name at instantiation time.
   1658   RecordVal DN("NAME", StringRecTy::get(), 0);
   1659   addValue(DN);
   1660 }
   1661 
   1662 void Record::checkName() {
   1663   // Ensure the record name has string type.
   1664   const TypedInit *TypedName = dyn_cast<const TypedInit>(Name);
   1665   assert(TypedName && "Record name is not typed!");
   1666   RecTy *Type = TypedName->getType();
   1667   if (!isa<StringRecTy>(Type))
   1668     PrintFatalError(getLoc(), "Record name is not a string!");
   1669 }
   1670 
   1671 DefInit *Record::getDefInit() {
   1672   if (!TheInit)
   1673     TheInit = new DefInit(this, new RecordRecTy(this));
   1674   return TheInit;
   1675 }
   1676 
   1677 const std::string &Record::getName() const {
   1678   const StringInit *NameString = dyn_cast<StringInit>(Name);
   1679   assert(NameString && "Record name is not a string!");
   1680   return NameString->getValue();
   1681 }
   1682 
   1683 void Record::setName(Init *NewName) {
   1684   if (TrackedRecords.getDef(Name->getAsUnquotedString()) == this) {
   1685     TrackedRecords.removeDef(Name->getAsUnquotedString());
   1686     TrackedRecords.addDef(this);
   1687   } else if (TrackedRecords.getClass(Name->getAsUnquotedString()) == this) {
   1688     TrackedRecords.removeClass(Name->getAsUnquotedString());
   1689     TrackedRecords.addClass(this);
   1690   }  // Otherwise this isn't yet registered.
   1691   Name = NewName;
   1692   checkName();
   1693   // DO NOT resolve record values to the name at this point because
   1694   // there might be default values for arguments of this def.  Those
   1695   // arguments might not have been resolved yet so we don't want to
   1696   // prematurely assume values for those arguments were not passed to
   1697   // this def.
   1698   //
   1699   // Nonetheless, it may be that some of this Record's values
   1700   // reference the record name.  Indeed, the reason for having the
   1701   // record name be an Init is to provide this flexibility.  The extra
   1702   // resolve steps after completely instantiating defs takes care of
   1703   // this.  See TGParser::ParseDef and TGParser::ParseDefm.
   1704 }
   1705 
   1706 void Record::setName(const std::string &Name) {
   1707   setName(StringInit::get(Name));
   1708 }
   1709 
   1710 /// resolveReferencesTo - If anything in this record refers to RV, replace the
   1711 /// reference to RV with the RHS of RV.  If RV is null, we resolve all possible
   1712 /// references.
   1713 void Record::resolveReferencesTo(const RecordVal *RV) {
   1714   for (unsigned i = 0, e = Values.size(); i != e; ++i) {
   1715     if (RV == &Values[i]) // Skip resolve the same field as the given one
   1716       continue;
   1717     if (Init *V = Values[i].getValue())
   1718       if (Values[i].setValue(V->resolveReferences(*this, RV)))
   1719         PrintFatalError(getLoc(), "Invalid value is found when setting '"
   1720                       + Values[i].getNameInitAsString()
   1721                       + "' after resolving references"
   1722                       + (RV ? " against '" + RV->getNameInitAsString()
   1723                               + "' of ("
   1724                               + RV->getValue()->getAsUnquotedString() + ")"
   1725                             : "")
   1726                       + "\n");
   1727   }
   1728   Init *OldName = getNameInit();
   1729   Init *NewName = Name->resolveReferences(*this, RV);
   1730   if (NewName != OldName) {
   1731     // Re-register with RecordKeeper.
   1732     setName(NewName);
   1733   }
   1734 }
   1735 
   1736 void Record::dump() const { errs() << *this; }
   1737 
   1738 raw_ostream &llvm::operator<<(raw_ostream &OS, const Record &R) {
   1739   OS << R.getNameInitAsString();
   1740 
   1741   const std::vector<Init *> &TArgs = R.getTemplateArgs();
   1742   if (!TArgs.empty()) {
   1743     OS << "<";
   1744     for (unsigned i = 0, e = TArgs.size(); i != e; ++i) {
   1745       if (i) OS << ", ";
   1746       const RecordVal *RV = R.getValue(TArgs[i]);
   1747       assert(RV && "Template argument record not found??");
   1748       RV->print(OS, false);
   1749     }
   1750     OS << ">";
   1751   }
   1752 
   1753   OS << " {";
   1754   const std::vector<Record*> &SC = R.getSuperClasses();
   1755   if (!SC.empty()) {
   1756     OS << "\t//";
   1757     for (unsigned i = 0, e = SC.size(); i != e; ++i)
   1758       OS << " " << SC[i]->getNameInitAsString();
   1759   }
   1760   OS << "\n";
   1761 
   1762   const std::vector<RecordVal> &Vals = R.getValues();
   1763   for (unsigned i = 0, e = Vals.size(); i != e; ++i)
   1764     if (Vals[i].getPrefix() && !R.isTemplateArg(Vals[i].getName()))
   1765       OS << Vals[i];
   1766   for (unsigned i = 0, e = Vals.size(); i != e; ++i)
   1767     if (!Vals[i].getPrefix() && !R.isTemplateArg(Vals[i].getName()))
   1768       OS << Vals[i];
   1769 
   1770   return OS << "}\n";
   1771 }
   1772 
   1773 /// getValueInit - Return the initializer for a value with the specified name,
   1774 /// or abort if the field does not exist.
   1775 ///
   1776 Init *Record::getValueInit(StringRef FieldName) const {
   1777   const RecordVal *R = getValue(FieldName);
   1778   if (R == 0 || R->getValue() == 0)
   1779     PrintFatalError(getLoc(), "Record `" + getName() +
   1780       "' does not have a field named `" + FieldName.str() + "'!\n");
   1781   return R->getValue();
   1782 }
   1783 
   1784 
   1785 /// getValueAsString - This method looks up the specified field and returns its
   1786 /// value as a string, aborts if the field does not exist or if
   1787 /// the value is not a string.
   1788 ///
   1789 std::string Record::getValueAsString(StringRef FieldName) const {
   1790   const RecordVal *R = getValue(FieldName);
   1791   if (R == 0 || R->getValue() == 0)
   1792     PrintFatalError(getLoc(), "Record `" + getName() +
   1793       "' does not have a field named `" + FieldName.str() + "'!\n");
   1794 
   1795   if (StringInit *SI = dyn_cast<StringInit>(R->getValue()))
   1796     return SI->getValue();
   1797   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1798     FieldName.str() + "' does not have a string initializer!");
   1799 }
   1800 
   1801 /// getValueAsBitsInit - This method looks up the specified field and returns
   1802 /// its value as a BitsInit, aborts if the field does not exist or if
   1803 /// the value is not the right type.
   1804 ///
   1805 BitsInit *Record::getValueAsBitsInit(StringRef FieldName) const {
   1806   const RecordVal *R = getValue(FieldName);
   1807   if (R == 0 || R->getValue() == 0)
   1808     PrintFatalError(getLoc(), "Record `" + getName() +
   1809       "' does not have a field named `" + FieldName.str() + "'!\n");
   1810 
   1811   if (BitsInit *BI = dyn_cast<BitsInit>(R->getValue()))
   1812     return BI;
   1813   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1814     FieldName.str() + "' does not have a BitsInit initializer!");
   1815 }
   1816 
   1817 /// getValueAsListInit - This method looks up the specified field and returns
   1818 /// its value as a ListInit, aborting if the field does not exist or if
   1819 /// the value is not the right type.
   1820 ///
   1821 ListInit *Record::getValueAsListInit(StringRef FieldName) const {
   1822   const RecordVal *R = getValue(FieldName);
   1823   if (R == 0 || R->getValue() == 0)
   1824     PrintFatalError(getLoc(), "Record `" + getName() +
   1825       "' does not have a field named `" + FieldName.str() + "'!\n");
   1826 
   1827   if (ListInit *LI = dyn_cast<ListInit>(R->getValue()))
   1828     return LI;
   1829   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1830     FieldName.str() + "' does not have a list initializer!");
   1831 }
   1832 
   1833 /// getValueAsListOfDefs - This method looks up the specified field and returns
   1834 /// its value as a vector of records, aborting if the field does not exist
   1835 /// or if the value is not the right type.
   1836 ///
   1837 std::vector<Record*>
   1838 Record::getValueAsListOfDefs(StringRef FieldName) const {
   1839   ListInit *List = getValueAsListInit(FieldName);
   1840   std::vector<Record*> Defs;
   1841   for (unsigned i = 0; i < List->getSize(); i++) {
   1842     if (DefInit *DI = dyn_cast<DefInit>(List->getElement(i))) {
   1843       Defs.push_back(DI->getDef());
   1844     } else {
   1845       PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1846         FieldName.str() + "' list is not entirely DefInit!");
   1847     }
   1848   }
   1849   return Defs;
   1850 }
   1851 
   1852 /// getValueAsInt - This method looks up the specified field and returns its
   1853 /// value as an int64_t, aborting if the field does not exist or if the value
   1854 /// is not the right type.
   1855 ///
   1856 int64_t Record::getValueAsInt(StringRef FieldName) const {
   1857   const RecordVal *R = getValue(FieldName);
   1858   if (R == 0 || R->getValue() == 0)
   1859     PrintFatalError(getLoc(), "Record `" + getName() +
   1860       "' does not have a field named `" + FieldName.str() + "'!\n");
   1861 
   1862   if (IntInit *II = dyn_cast<IntInit>(R->getValue()))
   1863     return II->getValue();
   1864   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1865     FieldName.str() + "' does not have an int initializer!");
   1866 }
   1867 
   1868 /// getValueAsListOfInts - This method looks up the specified field and returns
   1869 /// its value as a vector of integers, aborting if the field does not exist or
   1870 /// if the value is not the right type.
   1871 ///
   1872 std::vector<int64_t>
   1873 Record::getValueAsListOfInts(StringRef FieldName) const {
   1874   ListInit *List = getValueAsListInit(FieldName);
   1875   std::vector<int64_t> Ints;
   1876   for (unsigned i = 0; i < List->getSize(); i++) {
   1877     if (IntInit *II = dyn_cast<IntInit>(List->getElement(i))) {
   1878       Ints.push_back(II->getValue());
   1879     } else {
   1880       PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1881         FieldName.str() + "' does not have a list of ints initializer!");
   1882     }
   1883   }
   1884   return Ints;
   1885 }
   1886 
   1887 /// getValueAsListOfStrings - This method looks up the specified field and
   1888 /// returns its value as a vector of strings, aborting if the field does not
   1889 /// exist or if the value is not the right type.
   1890 ///
   1891 std::vector<std::string>
   1892 Record::getValueAsListOfStrings(StringRef FieldName) const {
   1893   ListInit *List = getValueAsListInit(FieldName);
   1894   std::vector<std::string> Strings;
   1895   for (unsigned i = 0; i < List->getSize(); i++) {
   1896     if (StringInit *II = dyn_cast<StringInit>(List->getElement(i))) {
   1897       Strings.push_back(II->getValue());
   1898     } else {
   1899       PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1900         FieldName.str() + "' does not have a list of strings initializer!");
   1901     }
   1902   }
   1903   return Strings;
   1904 }
   1905 
   1906 /// getValueAsDef - This method looks up the specified field and returns its
   1907 /// value as a Record, aborting if the field does not exist or if the value
   1908 /// is not the right type.
   1909 ///
   1910 Record *Record::getValueAsDef(StringRef FieldName) const {
   1911   const RecordVal *R = getValue(FieldName);
   1912   if (R == 0 || R->getValue() == 0)
   1913     PrintFatalError(getLoc(), "Record `" + getName() +
   1914       "' does not have a field named `" + FieldName.str() + "'!\n");
   1915 
   1916   if (DefInit *DI = dyn_cast<DefInit>(R->getValue()))
   1917     return DI->getDef();
   1918   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1919     FieldName.str() + "' does not have a def initializer!");
   1920 }
   1921 
   1922 /// getValueAsBit - This method looks up the specified field and returns its
   1923 /// value as a bit, aborting if the field does not exist or if the value is
   1924 /// not the right type.
   1925 ///
   1926 bool Record::getValueAsBit(StringRef FieldName) const {
   1927   const RecordVal *R = getValue(FieldName);
   1928   if (R == 0 || R->getValue() == 0)
   1929     PrintFatalError(getLoc(), "Record `" + getName() +
   1930       "' does not have a field named `" + FieldName.str() + "'!\n");
   1931 
   1932   if (BitInit *BI = dyn_cast<BitInit>(R->getValue()))
   1933     return BI->getValue();
   1934   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1935     FieldName.str() + "' does not have a bit initializer!");
   1936 }
   1937 
   1938 bool Record::getValueAsBitOrUnset(StringRef FieldName, bool &Unset) const {
   1939   const RecordVal *R = getValue(FieldName);
   1940   if (R == 0 || R->getValue() == 0)
   1941     PrintFatalError(getLoc(), "Record `" + getName() +
   1942       "' does not have a field named `" + FieldName.str() + "'!\n");
   1943 
   1944   if (R->getValue() == UnsetInit::get()) {
   1945     Unset = true;
   1946     return false;
   1947   }
   1948   Unset = false;
   1949   if (BitInit *BI = dyn_cast<BitInit>(R->getValue()))
   1950     return BI->getValue();
   1951   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1952     FieldName.str() + "' does not have a bit initializer!");
   1953 }
   1954 
   1955 /// getValueAsDag - This method looks up the specified field and returns its
   1956 /// value as an Dag, aborting if the field does not exist or if the value is
   1957 /// not the right type.
   1958 ///
   1959 DagInit *Record::getValueAsDag(StringRef FieldName) const {
   1960   const RecordVal *R = getValue(FieldName);
   1961   if (R == 0 || R->getValue() == 0)
   1962     PrintFatalError(getLoc(), "Record `" + getName() +
   1963       "' does not have a field named `" + FieldName.str() + "'!\n");
   1964 
   1965   if (DagInit *DI = dyn_cast<DagInit>(R->getValue()))
   1966     return DI;
   1967   PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
   1968     FieldName.str() + "' does not have a dag initializer!");
   1969 }
   1970 
   1971 
   1972 void MultiClass::dump() const {
   1973   errs() << "Record:\n";
   1974   Rec.dump();
   1975 
   1976   errs() << "Defs:\n";
   1977   for (RecordVector::const_iterator r = DefPrototypes.begin(),
   1978          rend = DefPrototypes.end();
   1979        r != rend;
   1980        ++r) {
   1981     (*r)->dump();
   1982   }
   1983 }
   1984 
   1985 
   1986 void RecordKeeper::dump() const { errs() << *this; }
   1987 
   1988 raw_ostream &llvm::operator<<(raw_ostream &OS, const RecordKeeper &RK) {
   1989   OS << "------------- Classes -----------------\n";
   1990   const std::map<std::string, Record*> &Classes = RK.getClasses();
   1991   for (std::map<std::string, Record*>::const_iterator I = Classes.begin(),
   1992          E = Classes.end(); I != E; ++I)
   1993     OS << "class " << *I->second;
   1994 
   1995   OS << "------------- Defs -----------------\n";
   1996   const std::map<std::string, Record*> &Defs = RK.getDefs();
   1997   for (std::map<std::string, Record*>::const_iterator I = Defs.begin(),
   1998          E = Defs.end(); I != E; ++I)
   1999     OS << "def " << *I->second;
   2000   return OS;
   2001 }
   2002 
   2003 
   2004 /// getAllDerivedDefinitions - This method returns all concrete definitions
   2005 /// that derive from the specified class name.  If a class with the specified
   2006 /// name does not exist, an error is printed and true is returned.
   2007 std::vector<Record*>
   2008 RecordKeeper::getAllDerivedDefinitions(const std::string &ClassName) const {
   2009   Record *Class = getClass(ClassName);
   2010   if (!Class)
   2011     PrintFatalError("ERROR: Couldn't find the `" + ClassName + "' class!\n");
   2012 
   2013   std::vector<Record*> Defs;
   2014   for (std::map<std::string, Record*>::const_iterator I = getDefs().begin(),
   2015          E = getDefs().end(); I != E; ++I)
   2016     if (I->second->isSubClassOf(Class))
   2017       Defs.push_back(I->second);
   2018 
   2019   return Defs;
   2020 }
   2021 
   2022 /// QualifyName - Return an Init with a qualifier prefix referring
   2023 /// to CurRec's name.
   2024 Init *llvm::QualifyName(Record &CurRec, MultiClass *CurMultiClass,
   2025                         Init *Name, const std::string &Scoper) {
   2026   RecTy *Type = dyn_cast<TypedInit>(Name)->getType();
   2027 
   2028   BinOpInit *NewName =
   2029     BinOpInit::get(BinOpInit::STRCONCAT,
   2030                       BinOpInit::get(BinOpInit::STRCONCAT,
   2031                                         CurRec.getNameInit(),
   2032                                         StringInit::get(Scoper),
   2033                                         Type)->Fold(&CurRec, CurMultiClass),
   2034                       Name,
   2035                       Type);
   2036 
   2037   if (CurMultiClass && Scoper != "::") {
   2038     NewName =
   2039       BinOpInit::get(BinOpInit::STRCONCAT,
   2040                         BinOpInit::get(BinOpInit::STRCONCAT,
   2041                                           CurMultiClass->Rec.getNameInit(),
   2042                                           StringInit::get("::"),
   2043                                           Type)->Fold(&CurRec, CurMultiClass),
   2044                         NewName->Fold(&CurRec, CurMultiClass),
   2045                         Type);
   2046   }
   2047 
   2048   return NewName->Fold(&CurRec, CurMultiClass);
   2049 }
   2050 
   2051 /// QualifyName - Return an Init with a qualifier prefix referring
   2052 /// to CurRec's name.
   2053 Init *llvm::QualifyName(Record &CurRec, MultiClass *CurMultiClass,
   2054                         const std::string &Name,
   2055                         const std::string &Scoper) {
   2056   return QualifyName(CurRec, CurMultiClass, StringInit::get(Name), Scoper);
   2057 }
   2058