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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 "Record.h"
     15 #include "Error.h"
     16 #include "llvm/Support/DataTypes.h"
     17 #include "llvm/Support/Format.h"
     18 #include "llvm/ADT/StringExtras.h"
     19 
     20 using namespace llvm;
     21 
     22 //===----------------------------------------------------------------------===//
     23 //    Type implementations
     24 //===----------------------------------------------------------------------===//
     25 
     26 BitRecTy BitRecTy::Shared;
     27 IntRecTy IntRecTy::Shared;
     28 StringRecTy StringRecTy::Shared;
     29 CodeRecTy CodeRecTy::Shared;
     30 DagRecTy DagRecTy::Shared;
     31 
     32 void RecTy::dump() const { print(errs()); }
     33 
     34 ListRecTy *RecTy::getListTy() {
     35   if (!ListTy)
     36     ListTy = new ListRecTy(this);
     37   return ListTy;
     38 }
     39 
     40 Init *BitRecTy::convertValue(BitsInit *BI) {
     41   if (BI->getNumBits() != 1) return 0; // Only accept if just one bit!
     42   return BI->getBit(0);
     43 }
     44 
     45 bool BitRecTy::baseClassOf(const BitsRecTy *RHS) const {
     46   return RHS->getNumBits() == 1;
     47 }
     48 
     49 Init *BitRecTy::convertValue(IntInit *II) {
     50   int64_t Val = II->getValue();
     51   if (Val != 0 && Val != 1) return 0;  // Only accept 0 or 1 for a bit!
     52 
     53   return new BitInit(Val != 0);
     54 }
     55 
     56 Init *BitRecTy::convertValue(TypedInit *VI) {
     57   if (dynamic_cast<BitRecTy*>(VI->getType()))
     58     return VI;  // Accept variable if it is already of bit type!
     59   return 0;
     60 }
     61 
     62 BitsRecTy *BitsRecTy::get(unsigned Sz) {
     63   static std::vector<BitsRecTy*> Shared;
     64   if (Sz >= Shared.size())
     65     Shared.resize(Sz + 1);
     66   BitsRecTy *&Ty = Shared[Sz];
     67   if (!Ty)
     68     Ty = new BitsRecTy(Sz);
     69   return Ty;
     70 }
     71 
     72 std::string BitsRecTy::getAsString() const {
     73   return "bits<" + utostr(Size) + ">";
     74 }
     75 
     76 Init *BitsRecTy::convertValue(UnsetInit *UI) {
     77   BitsInit *Ret = new BitsInit(Size);
     78 
     79   for (unsigned i = 0; i != Size; ++i)
     80     Ret->setBit(i, new UnsetInit());
     81   return Ret;
     82 }
     83 
     84 Init *BitsRecTy::convertValue(BitInit *UI) {
     85   if (Size != 1) return 0;  // Can only convert single bit.
     86   BitsInit *Ret = new BitsInit(1);
     87   Ret->setBit(0, UI);
     88   return Ret;
     89 }
     90 
     91 /// canFitInBitfield - Return true if the number of bits is large enough to hold
     92 /// the integer value.
     93 static bool canFitInBitfield(int64_t Value, unsigned NumBits) {
     94   // For example, with NumBits == 4, we permit Values from [-7 .. 15].
     95   return (NumBits >= sizeof(Value) * 8) ||
     96          (Value >> NumBits == 0) || (Value >> (NumBits-1) == -1);
     97 }
     98 
     99 /// convertValue from Int initializer to bits type: Split the integer up into the
    100 /// appropriate bits.
    101 ///
    102 Init *BitsRecTy::convertValue(IntInit *II) {
    103   int64_t Value = II->getValue();
    104   // Make sure this bitfield is large enough to hold the integer value.
    105   if (!canFitInBitfield(Value, Size))
    106     return 0;
    107 
    108   BitsInit *Ret = new BitsInit(Size);
    109   for (unsigned i = 0; i != Size; ++i)
    110     Ret->setBit(i, new BitInit(Value & (1LL << i)));
    111 
    112   return Ret;
    113 }
    114 
    115 Init *BitsRecTy::convertValue(BitsInit *BI) {
    116   // If the number of bits is right, return it.  Otherwise we need to expand or
    117   // truncate.
    118   if (BI->getNumBits() == Size) return BI;
    119   return 0;
    120 }
    121 
    122 Init *BitsRecTy::convertValue(TypedInit *VI) {
    123   if (BitsRecTy *BRT = dynamic_cast<BitsRecTy*>(VI->getType()))
    124     if (BRT->Size == Size) {
    125       BitsInit *Ret = new BitsInit(Size);
    126       for (unsigned i = 0; i != Size; ++i)
    127         Ret->setBit(i, new VarBitInit(VI, i));
    128       return Ret;
    129     }
    130 
    131   if (Size == 1 && dynamic_cast<BitRecTy*>(VI->getType())) {
    132     BitsInit *Ret = new BitsInit(1);
    133     Ret->setBit(0, VI);
    134     return Ret;
    135   }
    136 
    137   if (TernOpInit *Tern = dynamic_cast<TernOpInit*>(VI)) {
    138     if (Tern->getOpcode() == TernOpInit::IF) {
    139       Init *LHS = Tern->getLHS();
    140       Init *MHS = Tern->getMHS();
    141       Init *RHS = Tern->getRHS();
    142 
    143       IntInit *MHSi = dynamic_cast<IntInit*>(MHS);
    144       IntInit *RHSi = dynamic_cast<IntInit*>(RHS);
    145 
    146       if (MHSi && RHSi) {
    147         int64_t MHSVal = MHSi->getValue();
    148         int64_t RHSVal = RHSi->getValue();
    149 
    150         if (canFitInBitfield(MHSVal, Size) && canFitInBitfield(RHSVal, Size)) {
    151           BitsInit *Ret = new BitsInit(Size);
    152 
    153           for (unsigned i = 0; i != Size; ++i)
    154             Ret->setBit(i, new TernOpInit(TernOpInit::IF, LHS,
    155                                           new IntInit((MHSVal & (1LL << i)) ? 1 : 0),
    156                                           new IntInit((RHSVal & (1LL << i)) ? 1 : 0),
    157                                           VI->getType()));
    158 
    159           return Ret;
    160         }
    161       } else {
    162         BitsInit *MHSbs = dynamic_cast<BitsInit*>(MHS);
    163         BitsInit *RHSbs = dynamic_cast<BitsInit*>(RHS);
    164 
    165         if (MHSbs && RHSbs) {
    166           BitsInit *Ret = new BitsInit(Size);
    167 
    168           for (unsigned i = 0; i != Size; ++i)
    169             Ret->setBit(i, new TernOpInit(TernOpInit::IF, LHS,
    170                                           MHSbs->getBit(i),
    171                                           RHSbs->getBit(i),
    172                                           VI->getType()));
    173 
    174           return Ret;
    175         }
    176       }
    177     }
    178   }
    179 
    180   return 0;
    181 }
    182 
    183 Init *IntRecTy::convertValue(BitInit *BI) {
    184   return new IntInit(BI->getValue());
    185 }
    186 
    187 Init *IntRecTy::convertValue(BitsInit *BI) {
    188   int64_t Result = 0;
    189   for (unsigned i = 0, e = BI->getNumBits(); i != e; ++i)
    190     if (BitInit *Bit = dynamic_cast<BitInit*>(BI->getBit(i))) {
    191       Result |= Bit->getValue() << i;
    192     } else {
    193       return 0;
    194     }
    195   return new IntInit(Result);
    196 }
    197 
    198 Init *IntRecTy::convertValue(TypedInit *TI) {
    199   if (TI->getType()->typeIsConvertibleTo(this))
    200     return TI;  // Accept variable if already of the right type!
    201   return 0;
    202 }
    203 
    204 Init *StringRecTy::convertValue(UnOpInit *BO) {
    205   if (BO->getOpcode() == UnOpInit::CAST) {
    206     Init *L = BO->getOperand()->convertInitializerTo(this);
    207     if (L == 0) return 0;
    208     if (L != BO->getOperand())
    209       return new UnOpInit(UnOpInit::CAST, L, new StringRecTy);
    210     return BO;
    211   }
    212 
    213   return convertValue((TypedInit*)BO);
    214 }
    215 
    216 Init *StringRecTy::convertValue(BinOpInit *BO) {
    217   if (BO->getOpcode() == BinOpInit::STRCONCAT) {
    218     Init *L = BO->getLHS()->convertInitializerTo(this);
    219     Init *R = BO->getRHS()->convertInitializerTo(this);
    220     if (L == 0 || R == 0) return 0;
    221     if (L != BO->getLHS() || R != BO->getRHS())
    222       return new BinOpInit(BinOpInit::STRCONCAT, L, R, new StringRecTy);
    223     return BO;
    224   }
    225 
    226   return convertValue((TypedInit*)BO);
    227 }
    228 
    229 
    230 Init *StringRecTy::convertValue(TypedInit *TI) {
    231   if (dynamic_cast<StringRecTy*>(TI->getType()))
    232     return TI;  // Accept variable if already of the right type!
    233   return 0;
    234 }
    235 
    236 std::string ListRecTy::getAsString() const {
    237   return "list<" + Ty->getAsString() + ">";
    238 }
    239 
    240 Init *ListRecTy::convertValue(ListInit *LI) {
    241   std::vector<Init*> Elements;
    242 
    243   // Verify that all of the elements of the list are subclasses of the
    244   // appropriate class!
    245   for (unsigned i = 0, e = LI->getSize(); i != e; ++i)
    246     if (Init *CI = LI->getElement(i)->convertInitializerTo(Ty))
    247       Elements.push_back(CI);
    248     else
    249       return 0;
    250 
    251   ListRecTy *LType = dynamic_cast<ListRecTy*>(LI->getType());
    252   if (LType == 0) {
    253     return 0;
    254   }
    255 
    256   return new ListInit(Elements, this);
    257 }
    258 
    259 Init *ListRecTy::convertValue(TypedInit *TI) {
    260   // Ensure that TI is compatible with our class.
    261   if (ListRecTy *LRT = dynamic_cast<ListRecTy*>(TI->getType()))
    262     if (LRT->getElementType()->typeIsConvertibleTo(getElementType()))
    263       return TI;
    264   return 0;
    265 }
    266 
    267 Init *CodeRecTy::convertValue(TypedInit *TI) {
    268   if (TI->getType()->typeIsConvertibleTo(this))
    269     return TI;
    270   return 0;
    271 }
    272 
    273 Init *DagRecTy::convertValue(TypedInit *TI) {
    274   if (TI->getType()->typeIsConvertibleTo(this))
    275     return TI;
    276   return 0;
    277 }
    278 
    279 Init *DagRecTy::convertValue(UnOpInit *BO) {
    280   if (BO->getOpcode() == UnOpInit::CAST) {
    281     Init *L = BO->getOperand()->convertInitializerTo(this);
    282     if (L == 0) return 0;
    283     if (L != BO->getOperand())
    284       return new UnOpInit(UnOpInit::CAST, L, new DagRecTy);
    285     return BO;
    286   }
    287   return 0;
    288 }
    289 
    290 Init *DagRecTy::convertValue(BinOpInit *BO) {
    291   if (BO->getOpcode() == BinOpInit::CONCAT) {
    292     Init *L = BO->getLHS()->convertInitializerTo(this);
    293     Init *R = BO->getRHS()->convertInitializerTo(this);
    294     if (L == 0 || R == 0) return 0;
    295     if (L != BO->getLHS() || R != BO->getRHS())
    296       return new BinOpInit(BinOpInit::CONCAT, L, R, new DagRecTy);
    297     return BO;
    298   }
    299   return 0;
    300 }
    301 
    302 RecordRecTy *RecordRecTy::get(Record *R) {
    303   return &dynamic_cast<RecordRecTy&>(*R->getDefInit()->getType());
    304 }
    305 
    306 std::string RecordRecTy::getAsString() const {
    307   return Rec->getName();
    308 }
    309 
    310 Init *RecordRecTy::convertValue(DefInit *DI) {
    311   // Ensure that DI is a subclass of Rec.
    312   if (!DI->getDef()->isSubClassOf(Rec))
    313     return 0;
    314   return DI;
    315 }
    316 
    317 Init *RecordRecTy::convertValue(TypedInit *TI) {
    318   // Ensure that TI is compatible with Rec.
    319   if (RecordRecTy *RRT = dynamic_cast<RecordRecTy*>(TI->getType()))
    320     if (RRT->getRecord()->isSubClassOf(getRecord()) ||
    321         RRT->getRecord() == getRecord())
    322       return TI;
    323   return 0;
    324 }
    325 
    326 bool RecordRecTy::baseClassOf(const RecordRecTy *RHS) const {
    327   if (Rec == RHS->getRecord() || RHS->getRecord()->isSubClassOf(Rec))
    328     return true;
    329 
    330   const std::vector<Record*> &SC = Rec->getSuperClasses();
    331   for (unsigned i = 0, e = SC.size(); i != e; ++i)
    332     if (RHS->getRecord()->isSubClassOf(SC[i]))
    333       return true;
    334 
    335   return false;
    336 }
    337 
    338 
    339 /// resolveTypes - Find a common type that T1 and T2 convert to.
    340 /// Return 0 if no such type exists.
    341 ///
    342 RecTy *llvm::resolveTypes(RecTy *T1, RecTy *T2) {
    343   if (!T1->typeIsConvertibleTo(T2)) {
    344     if (!T2->typeIsConvertibleTo(T1)) {
    345       // If one is a Record type, check superclasses
    346       RecordRecTy *RecTy1 = dynamic_cast<RecordRecTy*>(T1);
    347       if (RecTy1) {
    348         // See if T2 inherits from a type T1 also inherits from
    349         const std::vector<Record *> &T1SuperClasses =
    350           RecTy1->getRecord()->getSuperClasses();
    351         for(std::vector<Record *>::const_iterator i = T1SuperClasses.begin(),
    352               iend = T1SuperClasses.end();
    353             i != iend;
    354             ++i) {
    355           RecordRecTy *SuperRecTy1 = RecordRecTy::get(*i);
    356           RecTy *NewType1 = resolveTypes(SuperRecTy1, T2);
    357           if (NewType1 != 0) {
    358             if (NewType1 != SuperRecTy1) {
    359               delete SuperRecTy1;
    360             }
    361             return NewType1;
    362           }
    363         }
    364       }
    365       RecordRecTy *RecTy2 = dynamic_cast<RecordRecTy*>(T2);
    366       if (RecTy2) {
    367         // See if T1 inherits from a type T2 also inherits from
    368         const std::vector<Record *> &T2SuperClasses =
    369           RecTy2->getRecord()->getSuperClasses();
    370         for (std::vector<Record *>::const_iterator i = T2SuperClasses.begin(),
    371               iend = T2SuperClasses.end();
    372             i != iend;
    373             ++i) {
    374           RecordRecTy *SuperRecTy2 = RecordRecTy::get(*i);
    375           RecTy *NewType2 = resolveTypes(T1, SuperRecTy2);
    376           if (NewType2 != 0) {
    377             if (NewType2 != SuperRecTy2) {
    378               delete SuperRecTy2;
    379             }
    380             return NewType2;
    381           }
    382         }
    383       }
    384       return 0;
    385     }
    386     return T2;
    387   }
    388   return T1;
    389 }
    390 
    391 
    392 //===----------------------------------------------------------------------===//
    393 //    Initializer implementations
    394 //===----------------------------------------------------------------------===//
    395 
    396 void Init::dump() const { return print(errs()); }
    397 
    398 Init *BitsInit::convertInitializerBitRange(const std::vector<unsigned> &Bits) {
    399   BitsInit *BI = new BitsInit(Bits.size());
    400   for (unsigned i = 0, e = Bits.size(); i != e; ++i) {
    401     if (Bits[i] >= getNumBits()) {
    402       delete BI;
    403       return 0;
    404     }
    405     BI->setBit(i, getBit(Bits[i]));
    406   }
    407   return BI;
    408 }
    409 
    410 std::string BitsInit::getAsString() const {
    411   std::string Result = "{ ";
    412   for (unsigned i = 0, e = getNumBits(); i != e; ++i) {
    413     if (i) Result += ", ";
    414     if (Init *Bit = getBit(e-i-1))
    415       Result += Bit->getAsString();
    416     else
    417       Result += "*";
    418   }
    419   return Result + " }";
    420 }
    421 
    422 // resolveReferences - If there are any field references that refer to fields
    423 // that have been filled in, we can propagate the values now.
    424 //
    425 Init *BitsInit::resolveReferences(Record &R, const RecordVal *RV) {
    426   bool Changed = false;
    427   BitsInit *New = new BitsInit(getNumBits());
    428 
    429   for (unsigned i = 0, e = Bits.size(); i != e; ++i) {
    430     Init *B;
    431     Init *CurBit = getBit(i);
    432 
    433     do {
    434       B = CurBit;
    435       CurBit = CurBit->resolveReferences(R, RV);
    436       Changed |= B != CurBit;
    437     } while (B != CurBit);
    438     New->setBit(i, CurBit);
    439   }
    440 
    441   if (Changed)
    442     return New;
    443   delete New;
    444   return this;
    445 }
    446 
    447 std::string IntInit::getAsString() const {
    448   return itostr(Value);
    449 }
    450 
    451 Init *IntInit::convertInitializerBitRange(const std::vector<unsigned> &Bits) {
    452   BitsInit *BI = new BitsInit(Bits.size());
    453 
    454   for (unsigned i = 0, e = Bits.size(); i != e; ++i) {
    455     if (Bits[i] >= 64) {
    456       delete BI;
    457       return 0;
    458     }
    459     BI->setBit(i, new BitInit(Value & (INT64_C(1) << Bits[i])));
    460   }
    461   return BI;
    462 }
    463 
    464 Init *ListInit::convertInitListSlice(const std::vector<unsigned> &Elements) {
    465   std::vector<Init*> Vals;
    466   for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
    467     if (Elements[i] >= getSize())
    468       return 0;
    469     Vals.push_back(getElement(Elements[i]));
    470   }
    471   return new ListInit(Vals, getType());
    472 }
    473 
    474 Record *ListInit::getElementAsRecord(unsigned i) const {
    475   assert(i < Values.size() && "List element index out of range!");
    476   DefInit *DI = dynamic_cast<DefInit*>(Values[i]);
    477   if (DI == 0) throw "Expected record in list!";
    478   return DI->getDef();
    479 }
    480 
    481 Init *ListInit::resolveReferences(Record &R, const RecordVal *RV) {
    482   std::vector<Init*> Resolved;
    483   Resolved.reserve(getSize());
    484   bool Changed = false;
    485 
    486   for (unsigned i = 0, e = getSize(); i != e; ++i) {
    487     Init *E;
    488     Init *CurElt = getElement(i);
    489 
    490     do {
    491       E = CurElt;
    492       CurElt = CurElt->resolveReferences(R, RV);
    493       Changed |= E != CurElt;
    494     } while (E != CurElt);
    495     Resolved.push_back(E);
    496   }
    497 
    498   if (Changed)
    499     return new ListInit(Resolved, getType());
    500   return this;
    501 }
    502 
    503 Init *ListInit::resolveListElementReference(Record &R, const RecordVal *IRV,
    504                                             unsigned Elt) {
    505   if (Elt >= getSize())
    506     return 0;  // Out of range reference.
    507   Init *E = getElement(Elt);
    508   // If the element is set to some value, or if we are resolving a reference
    509   // to a specific variable and that variable is explicitly unset, then
    510   // replace the VarListElementInit with it.
    511   if (IRV || !dynamic_cast<UnsetInit*>(E))
    512     return E;
    513   return 0;
    514 }
    515 
    516 std::string ListInit::getAsString() const {
    517   std::string Result = "[";
    518   for (unsigned i = 0, e = Values.size(); i != e; ++i) {
    519     if (i) Result += ", ";
    520     Result += Values[i]->getAsString();
    521   }
    522   return Result + "]";
    523 }
    524 
    525 Init *OpInit::resolveBitReference(Record &R, const RecordVal *IRV,
    526                                   unsigned Bit) {
    527   Init *Folded = Fold(&R, 0);
    528 
    529   if (Folded != this) {
    530     TypedInit *Typed = dynamic_cast<TypedInit *>(Folded);
    531     if (Typed) {
    532       return Typed->resolveBitReference(R, IRV, Bit);
    533     }
    534   }
    535 
    536   return 0;
    537 }
    538 
    539 Init *OpInit::resolveListElementReference(Record &R, const RecordVal *IRV,
    540                                           unsigned Elt) {
    541   Init *Folded = Fold(&R, 0);
    542 
    543   if (Folded != this) {
    544     TypedInit *Typed = dynamic_cast<TypedInit *>(Folded);
    545     if (Typed) {
    546       return Typed->resolveListElementReference(R, IRV, Elt);
    547     }
    548   }
    549 
    550   return 0;
    551 }
    552 
    553 Init *UnOpInit::Fold(Record *CurRec, MultiClass *CurMultiClass) {
    554   switch (getOpcode()) {
    555   default: assert(0 && "Unknown unop");
    556   case CAST: {
    557     if (getType()->getAsString() == "string") {
    558       StringInit *LHSs = dynamic_cast<StringInit*>(LHS);
    559       if (LHSs) {
    560         return LHSs;
    561       }
    562 
    563       DefInit *LHSd = dynamic_cast<DefInit*>(LHS);
    564       if (LHSd) {
    565         return new StringInit(LHSd->getDef()->getName());
    566       }
    567     } else {
    568       StringInit *LHSs = dynamic_cast<StringInit*>(LHS);
    569       if (LHSs) {
    570         std::string Name = LHSs->getValue();
    571 
    572         // From TGParser::ParseIDValue
    573         if (CurRec) {
    574           if (const RecordVal *RV = CurRec->getValue(Name)) {
    575             if (RV->getType() != getType())
    576               throw "type mismatch in cast";
    577             return new VarInit(Name, RV->getType());
    578           }
    579 
    580           std::string TemplateArgName = CurRec->getName()+":"+Name;
    581           if (CurRec->isTemplateArg(TemplateArgName)) {
    582             const RecordVal *RV = CurRec->getValue(TemplateArgName);
    583             assert(RV && "Template arg doesn't exist??");
    584 
    585             if (RV->getType() != getType())
    586               throw "type mismatch in cast";
    587 
    588             return new VarInit(TemplateArgName, RV->getType());
    589           }
    590         }
    591 
    592         if (CurMultiClass) {
    593           std::string MCName = CurMultiClass->Rec.getName()+"::"+Name;
    594           if (CurMultiClass->Rec.isTemplateArg(MCName)) {
    595             const RecordVal *RV = CurMultiClass->Rec.getValue(MCName);
    596             assert(RV && "Template arg doesn't exist??");
    597 
    598             if (RV->getType() != getType())
    599               throw "type mismatch in cast";
    600 
    601             return new VarInit(MCName, RV->getType());
    602           }
    603         }
    604 
    605         if (Record *D = (CurRec->getRecords()).getDef(Name))
    606           return DefInit::get(D);
    607 
    608         throw TGError(CurRec->getLoc(), "Undefined reference:'" + Name + "'\n");
    609       }
    610     }
    611     break;
    612   }
    613   case HEAD: {
    614     ListInit *LHSl = dynamic_cast<ListInit*>(LHS);
    615     if (LHSl) {
    616       if (LHSl->getSize() == 0) {
    617         assert(0 && "Empty list in car");
    618         return 0;
    619       }
    620       return LHSl->getElement(0);
    621     }
    622     break;
    623   }
    624   case TAIL: {
    625     ListInit *LHSl = dynamic_cast<ListInit*>(LHS);
    626     if (LHSl) {
    627       if (LHSl->getSize() == 0) {
    628         assert(0 && "Empty list in cdr");
    629         return 0;
    630       }
    631       ListInit *Result = new ListInit(LHSl->begin()+1, LHSl->end(),
    632                                       LHSl->getType());
    633       return Result;
    634     }
    635     break;
    636   }
    637   case EMPTY: {
    638     ListInit *LHSl = dynamic_cast<ListInit*>(LHS);
    639     if (LHSl) {
    640       if (LHSl->getSize() == 0) {
    641         return new IntInit(1);
    642       } else {
    643         return new IntInit(0);
    644       }
    645     }
    646     StringInit *LHSs = dynamic_cast<StringInit*>(LHS);
    647     if (LHSs) {
    648       if (LHSs->getValue().empty()) {
    649         return new IntInit(1);
    650       } else {
    651         return new IntInit(0);
    652       }
    653     }
    654 
    655     break;
    656   }
    657   }
    658   return this;
    659 }
    660 
    661 Init *UnOpInit::resolveReferences(Record &R, const RecordVal *RV) {
    662   Init *lhs = LHS->resolveReferences(R, RV);
    663 
    664   if (LHS != lhs)
    665     return (new UnOpInit(getOpcode(), lhs, getType()))->Fold(&R, 0);
    666   return Fold(&R, 0);
    667 }
    668 
    669 std::string UnOpInit::getAsString() const {
    670   std::string Result;
    671   switch (Opc) {
    672   case CAST: Result = "!cast<" + getType()->getAsString() + ">"; break;
    673   case HEAD: Result = "!head"; break;
    674   case TAIL: Result = "!tail"; break;
    675   case EMPTY: Result = "!empty"; break;
    676   }
    677   return Result + "(" + LHS->getAsString() + ")";
    678 }
    679 
    680 Init *BinOpInit::Fold(Record *CurRec, MultiClass *CurMultiClass) {
    681   switch (getOpcode()) {
    682   default: assert(0 && "Unknown binop");
    683   case CONCAT: {
    684     DagInit *LHSs = dynamic_cast<DagInit*>(LHS);
    685     DagInit *RHSs = dynamic_cast<DagInit*>(RHS);
    686     if (LHSs && RHSs) {
    687       DefInit *LOp = dynamic_cast<DefInit*>(LHSs->getOperator());
    688       DefInit *ROp = dynamic_cast<DefInit*>(RHSs->getOperator());
    689       if (LOp == 0 || ROp == 0 || LOp->getDef() != ROp->getDef())
    690         throw "Concated Dag operators do not match!";
    691       std::vector<Init*> Args;
    692       std::vector<std::string> ArgNames;
    693       for (unsigned i = 0, e = LHSs->getNumArgs(); i != e; ++i) {
    694         Args.push_back(LHSs->getArg(i));
    695         ArgNames.push_back(LHSs->getArgName(i));
    696       }
    697       for (unsigned i = 0, e = RHSs->getNumArgs(); i != e; ++i) {
    698         Args.push_back(RHSs->getArg(i));
    699         ArgNames.push_back(RHSs->getArgName(i));
    700       }
    701       return new DagInit(LHSs->getOperator(), "", Args, ArgNames);
    702     }
    703     break;
    704   }
    705   case STRCONCAT: {
    706     StringInit *LHSs = dynamic_cast<StringInit*>(LHS);
    707     StringInit *RHSs = dynamic_cast<StringInit*>(RHS);
    708     if (LHSs && RHSs)
    709       return new StringInit(LHSs->getValue() + RHSs->getValue());
    710     break;
    711   }
    712   case EQ: {
    713     // try to fold eq comparison for 'bit' and 'int', otherwise fallback
    714     // to string objects.
    715     IntInit* L =
    716       dynamic_cast<IntInit*>(LHS->convertInitializerTo(IntRecTy::get()));
    717     IntInit* R =
    718       dynamic_cast<IntInit*>(RHS->convertInitializerTo(IntRecTy::get()));
    719 
    720     if (L && R)
    721       return new IntInit(L->getValue() == R->getValue());
    722 
    723     StringInit *LHSs = dynamic_cast<StringInit*>(LHS);
    724     StringInit *RHSs = dynamic_cast<StringInit*>(RHS);
    725 
    726     // Make sure we've resolved
    727     if (LHSs && RHSs)
    728       return new IntInit(LHSs->getValue() == RHSs->getValue());
    729 
    730     break;
    731   }
    732   case SHL:
    733   case SRA:
    734   case SRL: {
    735     IntInit *LHSi = dynamic_cast<IntInit*>(LHS);
    736     IntInit *RHSi = dynamic_cast<IntInit*>(RHS);
    737     if (LHSi && RHSi) {
    738       int64_t LHSv = LHSi->getValue(), RHSv = RHSi->getValue();
    739       int64_t Result;
    740       switch (getOpcode()) {
    741       default: assert(0 && "Bad opcode!");
    742       case SHL: Result = LHSv << RHSv; break;
    743       case SRA: Result = LHSv >> RHSv; break;
    744       case SRL: Result = (uint64_t)LHSv >> (uint64_t)RHSv; break;
    745       }
    746       return new IntInit(Result);
    747     }
    748     break;
    749   }
    750   }
    751   return this;
    752 }
    753 
    754 Init *BinOpInit::resolveReferences(Record &R, const RecordVal *RV) {
    755   Init *lhs = LHS->resolveReferences(R, RV);
    756   Init *rhs = RHS->resolveReferences(R, RV);
    757 
    758   if (LHS != lhs || RHS != rhs)
    759     return (new BinOpInit(getOpcode(), lhs, rhs, getType()))->Fold(&R, 0);
    760   return Fold(&R, 0);
    761 }
    762 
    763 std::string BinOpInit::getAsString() const {
    764   std::string Result;
    765   switch (Opc) {
    766   case CONCAT: Result = "!con"; break;
    767   case SHL: Result = "!shl"; break;
    768   case SRA: Result = "!sra"; break;
    769   case SRL: Result = "!srl"; break;
    770   case EQ: Result = "!eq"; break;
    771   case STRCONCAT: Result = "!strconcat"; break;
    772   }
    773   return Result + "(" + LHS->getAsString() + ", " + RHS->getAsString() + ")";
    774 }
    775 
    776 static Init *ForeachHelper(Init *LHS, Init *MHS, Init *RHS, RecTy *Type,
    777                            Record *CurRec, MultiClass *CurMultiClass);
    778 
    779 static Init *EvaluateOperation(OpInit *RHSo, Init *LHS, Init *Arg,
    780                                RecTy *Type, Record *CurRec,
    781                                MultiClass *CurMultiClass) {
    782   std::vector<Init *> NewOperands;
    783 
    784   TypedInit *TArg = dynamic_cast<TypedInit*>(Arg);
    785 
    786   // If this is a dag, recurse
    787   if (TArg && TArg->getType()->getAsString() == "dag") {
    788     Init *Result = ForeachHelper(LHS, Arg, RHSo, Type,
    789                                  CurRec, CurMultiClass);
    790     if (Result != 0) {
    791       return Result;
    792     } else {
    793       return 0;
    794     }
    795   }
    796 
    797   for (int i = 0; i < RHSo->getNumOperands(); ++i) {
    798     OpInit *RHSoo = dynamic_cast<OpInit*>(RHSo->getOperand(i));
    799 
    800     if (RHSoo) {
    801       Init *Result = EvaluateOperation(RHSoo, LHS, Arg,
    802                                        Type, CurRec, CurMultiClass);
    803       if (Result != 0) {
    804         NewOperands.push_back(Result);
    805       } else {
    806         NewOperands.push_back(Arg);
    807       }
    808     } else if (LHS->getAsString() == RHSo->getOperand(i)->getAsString()) {
    809       NewOperands.push_back(Arg);
    810     } else {
    811       NewOperands.push_back(RHSo->getOperand(i));
    812     }
    813   }
    814 
    815   // Now run the operator and use its result as the new leaf
    816   OpInit *NewOp = RHSo->clone(NewOperands);
    817   Init *NewVal = NewOp->Fold(CurRec, CurMultiClass);
    818   if (NewVal != NewOp) {
    819     delete NewOp;
    820     return NewVal;
    821   }
    822   return 0;
    823 }
    824 
    825 static Init *ForeachHelper(Init *LHS, Init *MHS, Init *RHS, RecTy *Type,
    826                            Record *CurRec, MultiClass *CurMultiClass) {
    827   DagInit *MHSd = dynamic_cast<DagInit*>(MHS);
    828   ListInit *MHSl = dynamic_cast<ListInit*>(MHS);
    829 
    830   DagRecTy *DagType = dynamic_cast<DagRecTy*>(Type);
    831   ListRecTy *ListType = dynamic_cast<ListRecTy*>(Type);
    832 
    833   OpInit *RHSo = dynamic_cast<OpInit*>(RHS);
    834 
    835   if (!RHSo) {
    836     throw TGError(CurRec->getLoc(), "!foreach requires an operator\n");
    837   }
    838 
    839   TypedInit *LHSt = dynamic_cast<TypedInit*>(LHS);
    840 
    841   if (!LHSt) {
    842     throw TGError(CurRec->getLoc(), "!foreach requires typed variable\n");
    843   }
    844 
    845   if ((MHSd && DagType) || (MHSl && ListType)) {
    846     if (MHSd) {
    847       Init *Val = MHSd->getOperator();
    848       Init *Result = EvaluateOperation(RHSo, LHS, Val,
    849                                        Type, CurRec, CurMultiClass);
    850       if (Result != 0) {
    851         Val = Result;
    852       }
    853 
    854       std::vector<std::pair<Init *, std::string> > args;
    855       for (unsigned int i = 0; i < MHSd->getNumArgs(); ++i) {
    856         Init *Arg;
    857         std::string ArgName;
    858         Arg = MHSd->getArg(i);
    859         ArgName = MHSd->getArgName(i);
    860 
    861         // Process args
    862         Init *Result = EvaluateOperation(RHSo, LHS, Arg, Type,
    863                                          CurRec, CurMultiClass);
    864         if (Result != 0) {
    865           Arg = Result;
    866         }
    867 
    868         // TODO: Process arg names
    869         args.push_back(std::make_pair(Arg, ArgName));
    870       }
    871 
    872       return new DagInit(Val, "", args);
    873     }
    874     if (MHSl) {
    875       std::vector<Init *> NewOperands;
    876       std::vector<Init *> NewList(MHSl->begin(), MHSl->end());
    877 
    878       for (ListInit::iterator li = NewList.begin(),
    879              liend = NewList.end();
    880            li != liend;
    881            ++li) {
    882         Init *Item = *li;
    883         NewOperands.clear();
    884         for(int i = 0; i < RHSo->getNumOperands(); ++i) {
    885           // First, replace the foreach variable with the list item
    886           if (LHS->getAsString() == RHSo->getOperand(i)->getAsString()) {
    887             NewOperands.push_back(Item);
    888           } else {
    889             NewOperands.push_back(RHSo->getOperand(i));
    890           }
    891         }
    892 
    893         // Now run the operator and use its result as the new list item
    894         OpInit *NewOp = RHSo->clone(NewOperands);
    895         Init *NewItem = NewOp->Fold(CurRec, CurMultiClass);
    896         if (NewItem != NewOp) {
    897           *li = NewItem;
    898           delete NewOp;
    899         }
    900       }
    901       return new ListInit(NewList, MHSl->getType());
    902     }
    903   }
    904   return 0;
    905 }
    906 
    907 Init *TernOpInit::Fold(Record *CurRec, MultiClass *CurMultiClass) {
    908   switch (getOpcode()) {
    909   default: assert(0 && "Unknown binop");
    910   case SUBST: {
    911     DefInit *LHSd = dynamic_cast<DefInit*>(LHS);
    912     VarInit *LHSv = dynamic_cast<VarInit*>(LHS);
    913     StringInit *LHSs = dynamic_cast<StringInit*>(LHS);
    914 
    915     DefInit *MHSd = dynamic_cast<DefInit*>(MHS);
    916     VarInit *MHSv = dynamic_cast<VarInit*>(MHS);
    917     StringInit *MHSs = dynamic_cast<StringInit*>(MHS);
    918 
    919     DefInit *RHSd = dynamic_cast<DefInit*>(RHS);
    920     VarInit *RHSv = dynamic_cast<VarInit*>(RHS);
    921     StringInit *RHSs = dynamic_cast<StringInit*>(RHS);
    922 
    923     if ((LHSd && MHSd && RHSd)
    924         || (LHSv && MHSv && RHSv)
    925         || (LHSs && MHSs && RHSs)) {
    926       if (RHSd) {
    927         Record *Val = RHSd->getDef();
    928         if (LHSd->getAsString() == RHSd->getAsString()) {
    929           Val = MHSd->getDef();
    930         }
    931         return DefInit::get(Val);
    932       }
    933       if (RHSv) {
    934         std::string Val = RHSv->getName();
    935         if (LHSv->getAsString() == RHSv->getAsString()) {
    936           Val = MHSv->getName();
    937         }
    938         return new VarInit(Val, getType());
    939       }
    940       if (RHSs) {
    941         std::string Val = RHSs->getValue();
    942 
    943         std::string::size_type found;
    944         std::string::size_type idx = 0;
    945         do {
    946           found = Val.find(LHSs->getValue(), idx);
    947           if (found != std::string::npos) {
    948             Val.replace(found, LHSs->getValue().size(), MHSs->getValue());
    949           }
    950           idx = found +  MHSs->getValue().size();
    951         } while (found != std::string::npos);
    952 
    953         return new StringInit(Val);
    954       }
    955     }
    956     break;
    957   }
    958 
    959   case FOREACH: {
    960     Init *Result = ForeachHelper(LHS, MHS, RHS, getType(),
    961                                  CurRec, CurMultiClass);
    962     if (Result != 0) {
    963       return Result;
    964     }
    965     break;
    966   }
    967 
    968   case IF: {
    969     IntInit *LHSi = dynamic_cast<IntInit*>(LHS);
    970     if (Init *I = LHS->convertInitializerTo(IntRecTy::get()))
    971       LHSi = dynamic_cast<IntInit*>(I);
    972     if (LHSi) {
    973       if (LHSi->getValue()) {
    974         return MHS;
    975       } else {
    976         return RHS;
    977       }
    978     }
    979     break;
    980   }
    981   }
    982 
    983   return this;
    984 }
    985 
    986 Init *TernOpInit::resolveReferences(Record &R, const RecordVal *RV) {
    987   Init *lhs = LHS->resolveReferences(R, RV);
    988 
    989   if (Opc == IF && lhs != LHS) {
    990     IntInit *Value = dynamic_cast<IntInit*>(lhs);
    991     if (Init *I = lhs->convertInitializerTo(IntRecTy::get()))
    992       Value = dynamic_cast<IntInit*>(I);
    993     if (Value != 0) {
    994       // Short-circuit
    995       if (Value->getValue()) {
    996         Init *mhs = MHS->resolveReferences(R, RV);
    997         return (new TernOpInit(getOpcode(), lhs, mhs,
    998                                RHS, getType()))->Fold(&R, 0);
    999       } else {
   1000         Init *rhs = RHS->resolveReferences(R, RV);
   1001         return (new TernOpInit(getOpcode(), lhs, MHS,
   1002                                rhs, getType()))->Fold(&R, 0);
   1003       }
   1004     }
   1005   }
   1006 
   1007   Init *mhs = MHS->resolveReferences(R, RV);
   1008   Init *rhs = RHS->resolveReferences(R, RV);
   1009 
   1010   if (LHS != lhs || MHS != mhs || RHS != rhs)
   1011     return (new TernOpInit(getOpcode(), lhs, mhs, rhs, getType()))->Fold(&R, 0);
   1012   return Fold(&R, 0);
   1013 }
   1014 
   1015 std::string TernOpInit::getAsString() const {
   1016   std::string Result;
   1017   switch (Opc) {
   1018   case SUBST: Result = "!subst"; break;
   1019   case FOREACH: Result = "!foreach"; break;
   1020   case IF: Result = "!if"; break;
   1021  }
   1022   return Result + "(" + LHS->getAsString() + ", " + MHS->getAsString() + ", "
   1023     + RHS->getAsString() + ")";
   1024 }
   1025 
   1026 RecTy *TypedInit::getFieldType(const std::string &FieldName) const {
   1027   RecordRecTy *RecordType = dynamic_cast<RecordRecTy *>(getType());
   1028   if (RecordType) {
   1029     RecordVal *Field = RecordType->getRecord()->getValue(FieldName);
   1030     if (Field) {
   1031       return Field->getType();
   1032     }
   1033   }
   1034   return 0;
   1035 }
   1036 
   1037 Init *TypedInit::convertInitializerBitRange(const std::vector<unsigned> &Bits) {
   1038   BitsRecTy *T = dynamic_cast<BitsRecTy*>(getType());
   1039   if (T == 0) return 0;  // Cannot subscript a non-bits variable.
   1040   unsigned NumBits = T->getNumBits();
   1041 
   1042   BitsInit *BI = new BitsInit(Bits.size());
   1043   for (unsigned i = 0, e = Bits.size(); i != e; ++i) {
   1044     if (Bits[i] >= NumBits) {
   1045       delete BI;
   1046       return 0;
   1047     }
   1048     BI->setBit(i, new VarBitInit(this, Bits[i]));
   1049   }
   1050   return BI;
   1051 }
   1052 
   1053 Init *TypedInit::convertInitListSlice(const std::vector<unsigned> &Elements) {
   1054   ListRecTy *T = dynamic_cast<ListRecTy*>(getType());
   1055   if (T == 0) return 0;  // Cannot subscript a non-list variable.
   1056 
   1057   if (Elements.size() == 1)
   1058     return new VarListElementInit(this, Elements[0]);
   1059 
   1060   std::vector<Init*> ListInits;
   1061   ListInits.reserve(Elements.size());
   1062   for (unsigned i = 0, e = Elements.size(); i != e; ++i)
   1063     ListInits.push_back(new VarListElementInit(this, Elements[i]));
   1064   return new ListInit(ListInits, T);
   1065 }
   1066 
   1067 
   1068 Init *VarInit::resolveBitReference(Record &R, const RecordVal *IRV,
   1069                                    unsigned Bit) {
   1070   if (R.isTemplateArg(getName())) return 0;
   1071   if (IRV && IRV->getName() != getName()) return 0;
   1072 
   1073   RecordVal *RV = R.getValue(getName());
   1074   assert(RV && "Reference to a non-existent variable?");
   1075   assert(dynamic_cast<BitsInit*>(RV->getValue()));
   1076   BitsInit *BI = (BitsInit*)RV->getValue();
   1077 
   1078   assert(Bit < BI->getNumBits() && "Bit reference out of range!");
   1079   Init *B = BI->getBit(Bit);
   1080 
   1081   // If the bit is set to some value, or if we are resolving a reference to a
   1082   // specific variable and that variable is explicitly unset, then replace the
   1083   // VarBitInit with it.
   1084   if (IRV || !dynamic_cast<UnsetInit*>(B))
   1085     return B;
   1086   return 0;
   1087 }
   1088 
   1089 Init *VarInit::resolveListElementReference(Record &R, const RecordVal *IRV,
   1090                                            unsigned Elt) {
   1091   if (R.isTemplateArg(getName())) return 0;
   1092   if (IRV && IRV->getName() != getName()) return 0;
   1093 
   1094   RecordVal *RV = R.getValue(getName());
   1095   assert(RV && "Reference to a non-existent variable?");
   1096   ListInit *LI = dynamic_cast<ListInit*>(RV->getValue());
   1097   if (!LI) {
   1098     VarInit *VI = dynamic_cast<VarInit*>(RV->getValue());
   1099     assert(VI && "Invalid list element!");
   1100     return new VarListElementInit(VI, Elt);
   1101   }
   1102 
   1103   if (Elt >= LI->getSize())
   1104     return 0;  // Out of range reference.
   1105   Init *E = LI->getElement(Elt);
   1106   // If the element is set to some value, or if we are resolving a reference
   1107   // to a specific variable and that variable is explicitly unset, then
   1108   // replace the VarListElementInit with it.
   1109   if (IRV || !dynamic_cast<UnsetInit*>(E))
   1110     return E;
   1111   return 0;
   1112 }
   1113 
   1114 
   1115 RecTy *VarInit::getFieldType(const std::string &FieldName) const {
   1116   if (RecordRecTy *RTy = dynamic_cast<RecordRecTy*>(getType()))
   1117     if (const RecordVal *RV = RTy->getRecord()->getValue(FieldName))
   1118       return RV->getType();
   1119   return 0;
   1120 }
   1121 
   1122 Init *VarInit::getFieldInit(Record &R, const RecordVal *RV,
   1123                             const std::string &FieldName) const {
   1124   if (dynamic_cast<RecordRecTy*>(getType()))
   1125     if (const RecordVal *Val = R.getValue(VarName)) {
   1126       if (RV != Val && (RV || dynamic_cast<UnsetInit*>(Val->getValue())))
   1127         return 0;
   1128       Init *TheInit = Val->getValue();
   1129       assert(TheInit != this && "Infinite loop detected!");
   1130       if (Init *I = TheInit->getFieldInit(R, RV, FieldName))
   1131         return I;
   1132       else
   1133         return 0;
   1134     }
   1135   return 0;
   1136 }
   1137 
   1138 /// resolveReferences - This method is used by classes that refer to other
   1139 /// variables which may not be defined at the time the expression is formed.
   1140 /// If a value is set for the variable later, this method will be called on
   1141 /// users of the value to allow the value to propagate out.
   1142 ///
   1143 Init *VarInit::resolveReferences(Record &R, const RecordVal *RV) {
   1144   if (RecordVal *Val = R.getValue(VarName))
   1145     if (RV == Val || (RV == 0 && !dynamic_cast<UnsetInit*>(Val->getValue())))
   1146       return Val->getValue();
   1147   return this;
   1148 }
   1149 
   1150 std::string VarBitInit::getAsString() const {
   1151    return TI->getAsString() + "{" + utostr(Bit) + "}";
   1152 }
   1153 
   1154 Init *VarBitInit::resolveReferences(Record &R, const RecordVal *RV) {
   1155   if (Init *I = getVariable()->resolveBitReference(R, RV, getBitNum()))
   1156     return I;
   1157   return this;
   1158 }
   1159 
   1160 std::string VarListElementInit::getAsString() const {
   1161   return TI->getAsString() + "[" + utostr(Element) + "]";
   1162 }
   1163 
   1164 Init *VarListElementInit::resolveReferences(Record &R, const RecordVal *RV) {
   1165   if (Init *I = getVariable()->resolveListElementReference(R, RV,
   1166                                                            getElementNum()))
   1167     return I;
   1168   return this;
   1169 }
   1170 
   1171 Init *VarListElementInit::resolveBitReference(Record &R, const RecordVal *RV,
   1172                                               unsigned Bit) {
   1173   // FIXME: This should be implemented, to support references like:
   1174   // bit B = AA[0]{1};
   1175   return 0;
   1176 }
   1177 
   1178 Init *VarListElementInit::
   1179 resolveListElementReference(Record &R, const RecordVal *RV, unsigned Elt) {
   1180   // FIXME: This should be implemented, to support references like:
   1181   // int B = AA[0][1];
   1182   return 0;
   1183 }
   1184 
   1185 DefInit *DefInit::get(Record *R) {
   1186   return R->getDefInit();
   1187 }
   1188 
   1189 RecTy *DefInit::getFieldType(const std::string &FieldName) const {
   1190   if (const RecordVal *RV = Def->getValue(FieldName))
   1191     return RV->getType();
   1192   return 0;
   1193 }
   1194 
   1195 Init *DefInit::getFieldInit(Record &R, const RecordVal *RV,
   1196                             const std::string &FieldName) const {
   1197   return Def->getValue(FieldName)->getValue();
   1198 }
   1199 
   1200 
   1201 std::string DefInit::getAsString() const {
   1202   return Def->getName();
   1203 }
   1204 
   1205 Init *FieldInit::resolveBitReference(Record &R, const RecordVal *RV,
   1206                                      unsigned Bit) {
   1207   if (Init *BitsVal = Rec->getFieldInit(R, RV, FieldName))
   1208     if (BitsInit *BI = dynamic_cast<BitsInit*>(BitsVal)) {
   1209       assert(Bit < BI->getNumBits() && "Bit reference out of range!");
   1210       Init *B = BI->getBit(Bit);
   1211 
   1212       if (dynamic_cast<BitInit*>(B))  // If the bit is set.
   1213         return B;                     // Replace the VarBitInit with it.
   1214     }
   1215   return 0;
   1216 }
   1217 
   1218 Init *FieldInit::resolveListElementReference(Record &R, const RecordVal *RV,
   1219                                              unsigned Elt) {
   1220   if (Init *ListVal = Rec->getFieldInit(R, RV, FieldName))
   1221     if (ListInit *LI = dynamic_cast<ListInit*>(ListVal)) {
   1222       if (Elt >= LI->getSize()) return 0;
   1223       Init *E = LI->getElement(Elt);
   1224 
   1225       // If the element is set to some value, or if we are resolving a
   1226       // reference to a specific variable and that variable is explicitly
   1227       // unset, then replace the VarListElementInit with it.
   1228       if (RV || !dynamic_cast<UnsetInit*>(E))
   1229         return E;
   1230     }
   1231   return 0;
   1232 }
   1233 
   1234 Init *FieldInit::resolveReferences(Record &R, const RecordVal *RV) {
   1235   Init *NewRec = RV ? Rec->resolveReferences(R, RV) : Rec;
   1236 
   1237   Init *BitsVal = NewRec->getFieldInit(R, RV, FieldName);
   1238   if (BitsVal) {
   1239     Init *BVR = BitsVal->resolveReferences(R, RV);
   1240     return BVR->isComplete() ? BVR : this;
   1241   }
   1242 
   1243   if (NewRec != Rec) {
   1244     return new FieldInit(NewRec, FieldName);
   1245   }
   1246   return this;
   1247 }
   1248 
   1249 Init *DagInit::resolveReferences(Record &R, const RecordVal *RV) {
   1250   std::vector<Init*> NewArgs;
   1251   for (unsigned i = 0, e = Args.size(); i != e; ++i)
   1252     NewArgs.push_back(Args[i]->resolveReferences(R, RV));
   1253 
   1254   Init *Op = Val->resolveReferences(R, RV);
   1255 
   1256   if (Args != NewArgs || Op != Val)
   1257     return new DagInit(Op, ValName, NewArgs, ArgNames);
   1258 
   1259   return this;
   1260 }
   1261 
   1262 
   1263 std::string DagInit::getAsString() const {
   1264   std::string Result = "(" + Val->getAsString();
   1265   if (!ValName.empty())
   1266     Result += ":" + ValName;
   1267   if (Args.size()) {
   1268     Result += " " + Args[0]->getAsString();
   1269     if (!ArgNames[0].empty()) Result += ":$" + ArgNames[0];
   1270     for (unsigned i = 1, e = Args.size(); i != e; ++i) {
   1271       Result += ", " + Args[i]->getAsString();
   1272       if (!ArgNames[i].empty()) Result += ":$" + ArgNames[i];
   1273     }
   1274   }
   1275   return Result + ")";
   1276 }
   1277 
   1278 
   1279 //===----------------------------------------------------------------------===//
   1280 //    Other implementations
   1281 //===----------------------------------------------------------------------===//
   1282 
   1283 RecordVal::RecordVal(const std::string &N, RecTy *T, unsigned P)
   1284   : Name(N), Ty(T), Prefix(P) {
   1285   Value = Ty->convertValue(new UnsetInit());
   1286   assert(Value && "Cannot create unset value for current type!");
   1287 }
   1288 
   1289 void RecordVal::dump() const { errs() << *this; }
   1290 
   1291 void RecordVal::print(raw_ostream &OS, bool PrintSem) const {
   1292   if (getPrefix()) OS << "field ";
   1293   OS << *getType() << " " << getName();
   1294 
   1295   if (getValue())
   1296     OS << " = " << *getValue();
   1297 
   1298   if (PrintSem) OS << ";\n";
   1299 }
   1300 
   1301 unsigned Record::LastID = 0;
   1302 
   1303 DefInit *Record::getDefInit() {
   1304   if (!TheInit)
   1305     TheInit = new DefInit(this, new RecordRecTy(this));
   1306   return TheInit;
   1307 }
   1308 
   1309 void Record::setName(const std::string &Name) {
   1310   if (TrackedRecords.getDef(getName()) == this) {
   1311     TrackedRecords.removeDef(getName());
   1312     this->Name = Name;
   1313     TrackedRecords.addDef(this);
   1314   } else {
   1315     TrackedRecords.removeClass(getName());
   1316     this->Name = Name;
   1317     TrackedRecords.addClass(this);
   1318   }
   1319 }
   1320 
   1321 /// resolveReferencesTo - If anything in this record refers to RV, replace the
   1322 /// reference to RV with the RHS of RV.  If RV is null, we resolve all possible
   1323 /// references.
   1324 void Record::resolveReferencesTo(const RecordVal *RV) {
   1325   for (unsigned i = 0, e = Values.size(); i != e; ++i) {
   1326     if (Init *V = Values[i].getValue())
   1327       Values[i].setValue(V->resolveReferences(*this, RV));
   1328   }
   1329 }
   1330 
   1331 void Record::dump() const { errs() << *this; }
   1332 
   1333 raw_ostream &llvm::operator<<(raw_ostream &OS, const Record &R) {
   1334   OS << R.getName();
   1335 
   1336   const std::vector<std::string> &TArgs = R.getTemplateArgs();
   1337   if (!TArgs.empty()) {
   1338     OS << "<";
   1339     for (unsigned i = 0, e = TArgs.size(); i != e; ++i) {
   1340       if (i) OS << ", ";
   1341       const RecordVal *RV = R.getValue(TArgs[i]);
   1342       assert(RV && "Template argument record not found??");
   1343       RV->print(OS, false);
   1344     }
   1345     OS << ">";
   1346   }
   1347 
   1348   OS << " {";
   1349   const std::vector<Record*> &SC = R.getSuperClasses();
   1350   if (!SC.empty()) {
   1351     OS << "\t//";
   1352     for (unsigned i = 0, e = SC.size(); i != e; ++i)
   1353       OS << " " << SC[i]->getName();
   1354   }
   1355   OS << "\n";
   1356 
   1357   const std::vector<RecordVal> &Vals = R.getValues();
   1358   for (unsigned i = 0, e = Vals.size(); i != e; ++i)
   1359     if (Vals[i].getPrefix() && !R.isTemplateArg(Vals[i].getName()))
   1360       OS << Vals[i];
   1361   for (unsigned i = 0, e = Vals.size(); i != e; ++i)
   1362     if (!Vals[i].getPrefix() && !R.isTemplateArg(Vals[i].getName()))
   1363       OS << Vals[i];
   1364 
   1365   return OS << "}\n";
   1366 }
   1367 
   1368 /// getValueInit - Return the initializer for a value with the specified name,
   1369 /// or throw an exception if the field does not exist.
   1370 ///
   1371 Init *Record::getValueInit(StringRef FieldName) const {
   1372   const RecordVal *R = getValue(FieldName);
   1373   if (R == 0 || R->getValue() == 0)
   1374     throw "Record `" + getName() + "' does not have a field named `" +
   1375       FieldName.str() + "'!\n";
   1376   return R->getValue();
   1377 }
   1378 
   1379 
   1380 /// getValueAsString - This method looks up the specified field and returns its
   1381 /// value as a string, throwing an exception if the field does not exist or if
   1382 /// the value is not a string.
   1383 ///
   1384 std::string Record::getValueAsString(StringRef FieldName) const {
   1385   const RecordVal *R = getValue(FieldName);
   1386   if (R == 0 || R->getValue() == 0)
   1387     throw "Record `" + getName() + "' does not have a field named `" +
   1388           FieldName.str() + "'!\n";
   1389 
   1390   if (const StringInit *SI = dynamic_cast<const StringInit*>(R->getValue()))
   1391     return SI->getValue();
   1392   throw "Record `" + getName() + "', field `" + FieldName.str() +
   1393         "' does not have a string initializer!";
   1394 }
   1395 
   1396 /// getValueAsBitsInit - This method looks up the specified field and returns
   1397 /// its value as a BitsInit, throwing an exception if the field does not exist
   1398 /// or if the value is not the right type.
   1399 ///
   1400 BitsInit *Record::getValueAsBitsInit(StringRef FieldName) const {
   1401   const RecordVal *R = getValue(FieldName);
   1402   if (R == 0 || R->getValue() == 0)
   1403     throw "Record `" + getName() + "' does not have a field named `" +
   1404           FieldName.str() + "'!\n";
   1405 
   1406   if (BitsInit *BI = dynamic_cast<BitsInit*>(R->getValue()))
   1407     return BI;
   1408   throw "Record `" + getName() + "', field `" + FieldName.str() +
   1409         "' does not have a BitsInit initializer!";
   1410 }
   1411 
   1412 /// getValueAsListInit - This method looks up the specified field and returns
   1413 /// its value as a ListInit, throwing an exception if the field does not exist
   1414 /// or if the value is not the right type.
   1415 ///
   1416 ListInit *Record::getValueAsListInit(StringRef FieldName) const {
   1417   const RecordVal *R = getValue(FieldName);
   1418   if (R == 0 || R->getValue() == 0)
   1419     throw "Record `" + getName() + "' does not have a field named `" +
   1420           FieldName.str() + "'!\n";
   1421 
   1422   if (ListInit *LI = dynamic_cast<ListInit*>(R->getValue()))
   1423     return LI;
   1424   throw "Record `" + getName() + "', field `" + FieldName.str() +
   1425         "' does not have a list initializer!";
   1426 }
   1427 
   1428 /// getValueAsListOfDefs - This method looks up the specified field and returns
   1429 /// its value as a vector of records, throwing an exception if the field does
   1430 /// not exist or if the value is not the right type.
   1431 ///
   1432 std::vector<Record*>
   1433 Record::getValueAsListOfDefs(StringRef FieldName) const {
   1434   ListInit *List = getValueAsListInit(FieldName);
   1435   std::vector<Record*> Defs;
   1436   for (unsigned i = 0; i < List->getSize(); i++) {
   1437     if (DefInit *DI = dynamic_cast<DefInit*>(List->getElement(i))) {
   1438       Defs.push_back(DI->getDef());
   1439     } else {
   1440       throw "Record `" + getName() + "', field `" + FieldName.str() +
   1441             "' list is not entirely DefInit!";
   1442     }
   1443   }
   1444   return Defs;
   1445 }
   1446 
   1447 /// getValueAsInt - This method looks up the specified field and returns its
   1448 /// value as an int64_t, throwing an exception if the field does not exist or if
   1449 /// the value is not the right type.
   1450 ///
   1451 int64_t Record::getValueAsInt(StringRef FieldName) const {
   1452   const RecordVal *R = getValue(FieldName);
   1453   if (R == 0 || R->getValue() == 0)
   1454     throw "Record `" + getName() + "' does not have a field named `" +
   1455           FieldName.str() + "'!\n";
   1456 
   1457   if (IntInit *II = dynamic_cast<IntInit*>(R->getValue()))
   1458     return II->getValue();
   1459   throw "Record `" + getName() + "', field `" + FieldName.str() +
   1460         "' does not have an int initializer!";
   1461 }
   1462 
   1463 /// getValueAsListOfInts - This method looks up the specified field and returns
   1464 /// its value as a vector of integers, throwing an exception if the field does
   1465 /// not exist or if the value is not the right type.
   1466 ///
   1467 std::vector<int64_t>
   1468 Record::getValueAsListOfInts(StringRef FieldName) const {
   1469   ListInit *List = getValueAsListInit(FieldName);
   1470   std::vector<int64_t> Ints;
   1471   for (unsigned i = 0; i < List->getSize(); i++) {
   1472     if (IntInit *II = dynamic_cast<IntInit*>(List->getElement(i))) {
   1473       Ints.push_back(II->getValue());
   1474     } else {
   1475       throw "Record `" + getName() + "', field `" + FieldName.str() +
   1476             "' does not have a list of ints initializer!";
   1477     }
   1478   }
   1479   return Ints;
   1480 }
   1481 
   1482 /// getValueAsListOfStrings - This method looks up the specified field and
   1483 /// returns its value as a vector of strings, throwing an exception if the
   1484 /// field does not exist or if the value is not the right type.
   1485 ///
   1486 std::vector<std::string>
   1487 Record::getValueAsListOfStrings(StringRef FieldName) const {
   1488   ListInit *List = getValueAsListInit(FieldName);
   1489   std::vector<std::string> Strings;
   1490   for (unsigned i = 0; i < List->getSize(); i++) {
   1491     if (StringInit *II = dynamic_cast<StringInit*>(List->getElement(i))) {
   1492       Strings.push_back(II->getValue());
   1493     } else {
   1494       throw "Record `" + getName() + "', field `" + FieldName.str() +
   1495             "' does not have a list of strings initializer!";
   1496     }
   1497   }
   1498   return Strings;
   1499 }
   1500 
   1501 /// getValueAsDef - This method looks up the specified field and returns its
   1502 /// value as a Record, throwing an exception if the field does not exist or if
   1503 /// the value is not the right type.
   1504 ///
   1505 Record *Record::getValueAsDef(StringRef FieldName) const {
   1506   const RecordVal *R = getValue(FieldName);
   1507   if (R == 0 || R->getValue() == 0)
   1508     throw "Record `" + getName() + "' does not have a field named `" +
   1509       FieldName.str() + "'!\n";
   1510 
   1511   if (DefInit *DI = dynamic_cast<DefInit*>(R->getValue()))
   1512     return DI->getDef();
   1513   throw "Record `" + getName() + "', field `" + FieldName.str() +
   1514         "' does not have a def initializer!";
   1515 }
   1516 
   1517 /// getValueAsBit - This method looks up the specified field and returns its
   1518 /// value as a bit, throwing an exception if the field does not exist or if
   1519 /// the value is not the right type.
   1520 ///
   1521 bool Record::getValueAsBit(StringRef FieldName) const {
   1522   const RecordVal *R = getValue(FieldName);
   1523   if (R == 0 || R->getValue() == 0)
   1524     throw "Record `" + getName() + "' does not have a field named `" +
   1525       FieldName.str() + "'!\n";
   1526 
   1527   if (BitInit *BI = dynamic_cast<BitInit*>(R->getValue()))
   1528     return BI->getValue();
   1529   throw "Record `" + getName() + "', field `" + FieldName.str() +
   1530         "' does not have a bit initializer!";
   1531 }
   1532 
   1533 /// getValueAsDag - This method looks up the specified field and returns its
   1534 /// value as an Dag, throwing an exception if the field does not exist or if
   1535 /// the value is not the right type.
   1536 ///
   1537 DagInit *Record::getValueAsDag(StringRef FieldName) const {
   1538   const RecordVal *R = getValue(FieldName);
   1539   if (R == 0 || R->getValue() == 0)
   1540     throw "Record `" + getName() + "' does not have a field named `" +
   1541       FieldName.str() + "'!\n";
   1542 
   1543   if (DagInit *DI = dynamic_cast<DagInit*>(R->getValue()))
   1544     return DI;
   1545   throw "Record `" + getName() + "', field `" + FieldName.str() +
   1546         "' does not have a dag initializer!";
   1547 }
   1548 
   1549 std::string Record::getValueAsCode(StringRef FieldName) const {
   1550   const RecordVal *R = getValue(FieldName);
   1551   if (R == 0 || R->getValue() == 0)
   1552     throw "Record `" + getName() + "' does not have a field named `" +
   1553       FieldName.str() + "'!\n";
   1554 
   1555   if (const CodeInit *CI = dynamic_cast<const CodeInit*>(R->getValue()))
   1556     return CI->getValue();
   1557   throw "Record `" + getName() + "', field `" + FieldName.str() +
   1558     "' does not have a code initializer!";
   1559 }
   1560 
   1561 
   1562 void MultiClass::dump() const {
   1563   errs() << "Record:\n";
   1564   Rec.dump();
   1565 
   1566   errs() << "Defs:\n";
   1567   for (RecordVector::const_iterator r = DefPrototypes.begin(),
   1568          rend = DefPrototypes.end();
   1569        r != rend;
   1570        ++r) {
   1571     (*r)->dump();
   1572   }
   1573 }
   1574 
   1575 
   1576 void RecordKeeper::dump() const { errs() << *this; }
   1577 
   1578 raw_ostream &llvm::operator<<(raw_ostream &OS, const RecordKeeper &RK) {
   1579   OS << "------------- Classes -----------------\n";
   1580   const std::map<std::string, Record*> &Classes = RK.getClasses();
   1581   for (std::map<std::string, Record*>::const_iterator I = Classes.begin(),
   1582          E = Classes.end(); I != E; ++I)
   1583     OS << "class " << *I->second;
   1584 
   1585   OS << "------------- Defs -----------------\n";
   1586   const std::map<std::string, Record*> &Defs = RK.getDefs();
   1587   for (std::map<std::string, Record*>::const_iterator I = Defs.begin(),
   1588          E = Defs.end(); I != E; ++I)
   1589     OS << "def " << *I->second;
   1590   return OS;
   1591 }
   1592 
   1593 
   1594 /// getAllDerivedDefinitions - This method returns all concrete definitions
   1595 /// that derive from the specified class name.  If a class with the specified
   1596 /// name does not exist, an error is printed and true is returned.
   1597 std::vector<Record*>
   1598 RecordKeeper::getAllDerivedDefinitions(const std::string &ClassName) const {
   1599   Record *Class = getClass(ClassName);
   1600   if (!Class)
   1601     throw "ERROR: Couldn't find the `" + ClassName + "' class!\n";
   1602 
   1603   std::vector<Record*> Defs;
   1604   for (std::map<std::string, Record*>::const_iterator I = getDefs().begin(),
   1605          E = getDefs().end(); I != E; ++I)
   1606     if (I->second->isSubClassOf(Class))
   1607       Defs.push_back(I->second);
   1608 
   1609   return Defs;
   1610 }
   1611 
   1612