utils/TableGen/IntrinsicEmitter.cpp

   1 //===- IntrinsicEmitter.cpp - Generate intrinsic information --------------===//
   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 // This tablegen backend emits information about intrinsic functions.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "CodeGenTarget.h"
  15 #include "IntrinsicEmitter.h"
  16 #include "Record.h"
  17 #include "llvm/ADT/StringExtras.h"
  18 #include <algorithm>
  19 using namespace llvm;
  20
  21 //===----------------------------------------------------------------------===//
  22 // IntrinsicEmitter Implementation
  23 //===----------------------------------------------------------------------===//
  24
  25 void IntrinsicEmitter::run(raw_ostream &OS) {
  26   EmitSourceFileHeader("Intrinsic Function Source Fragment", OS);
  27
  28   std::vector<CodeGenIntrinsic> Ints = LoadIntrinsics(Records, TargetOnly);
  29
  30   if (TargetOnly && !Ints.empty())
  31     TargetPrefix = Ints[0].TargetPrefix;
  32
  33   // Emit the enum information.
  34   EmitEnumInfo(Ints, OS);
  35
  36   // Emit the intrinsic ID -> name table.
  37   EmitIntrinsicToNameTable(Ints, OS);
  38
  39   // Emit the intrinsic ID -> overload table.
  40   EmitIntrinsicToOverloadTable(Ints, OS);
  41
  42   // Emit the function name recognizer.
  43   EmitFnNameRecognizer(Ints, OS);
  44
  45   // Emit the intrinsic verifier.
  46   EmitVerifier(Ints, OS);
  47
  48   // Emit the intrinsic declaration generator.
  49   EmitGenerator(Ints, OS);
  50
  51   // Emit the intrinsic parameter attributes.
  52   EmitAttributes(Ints, OS);
  53
  54   // Emit intrinsic alias analysis mod/ref behavior.
  55   EmitModRefBehavior(Ints, OS);
  56
  57   // Emit a list of intrinsics with corresponding GCC builtins.
  58   EmitGCCBuiltinList(Ints, OS);
  59
  60   // Emit code to translate GCC builtins into LLVM intrinsics.
  61   EmitIntrinsicToGCCBuiltinMap(Ints, OS);
  62 }
  63
  64 void IntrinsicEmitter::EmitEnumInfo(const std::vector<CodeGenIntrinsic> &Ints,
  65                                     raw_ostream &OS) {
  66   OS << "// Enum values for Intrinsics.h\n";
  67   OS << "#ifdef GET_INTRINSIC_ENUM_VALUES\n";
  68   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
  69     OS << "    " << Ints[i].EnumName;
  70     OS << ((i != e-1) ? ", " : "  ");
  71     OS << std::string(40-Ints[i].EnumName.size(), ' ')
  72       << "// " << Ints[i].Name << "\n";
  73   }
  74   OS << "#endif\n\n";
  75 }
  76
  77 void IntrinsicEmitter::
  78 EmitFnNameRecognizer(const std::vector<CodeGenIntrinsic> &Ints,
  79                      raw_ostream &OS) {
  80   // Build a function name -> intrinsic name mapping.
  81   std::map<std::string, unsigned> IntMapping;
  82   for (unsigned i = 0, e = Ints.size(); i != e; ++i)
  83     IntMapping[Ints[i].Name] = i;
  84
  85   OS << "// Function name -> enum value recognizer code.\n";
  86   OS << "#ifdef GET_FUNCTION_RECOGNIZER\n";
  87   OS << "  switch (Name[5]) {\n";
  88   OS << "  default:\n";
  89   // Emit the intrinsics in sorted order.
  90   char LastChar = 0;
  91   for (std::map<std::string, unsigned>::iterator I = IntMapping.begin(),
  92        E = IntMapping.end(); I != E; ++I) {
  93     if (I->first[5] != LastChar) {
  94       LastChar = I->first[5];
  95       OS << "    break;\n";
  96       OS << "  case '" << LastChar << "':\n";
  97     }
  98
  99     // For overloaded intrinsics, only the prefix needs to match
 100     if (Ints[I->second].isOverloaded)
 101       OS << "    if (Len > " << I->first.size()
 102        << " && !memcmp(Name, \"" << I->first << ".\", "
 103        << (I->first.size() + 1) << ")) return " << TargetPrefix << "Intrinsic::"
 104        << Ints[I->second].EnumName << ";\n";
 105     else
 106       OS << "    if (Len == " << I->first.size()
 107          << " && !memcmp(Name, \"" << I->first << "\", "
 108          << I->first.size() << ")) return " << TargetPrefix << "Intrinsic::"
 109          << Ints[I->second].EnumName << ";\n";
 110   }
 111   OS << "  }\n";
 112   OS << "#endif\n\n";
 113 }
 114
 115 void IntrinsicEmitter::
 116 EmitIntrinsicToNameTable(const std::vector<CodeGenIntrinsic> &Ints,
 117                          raw_ostream &OS) {
 118   OS << "// Intrinsic ID to name table\n";
 119   OS << "#ifdef GET_INTRINSIC_NAME_TABLE\n";
 120   OS << "  // Note that entry #0 is the invalid intrinsic!\n";
 121   for (unsigned i = 0, e = Ints.size(); i != e; ++i)
 122     OS << "  \"" << Ints[i].Name << "\",\n";
 123   OS << "#endif\n\n";
 124 }
 125
 126 void IntrinsicEmitter::
 127 EmitIntrinsicToOverloadTable(const std::vector<CodeGenIntrinsic> &Ints,
 128                          raw_ostream &OS) {
 129   OS << "// Intrinsic ID to overload table\n";
 130   OS << "#ifdef GET_INTRINSIC_OVERLOAD_TABLE\n";
 131   OS << "  // Note that entry #0 is the invalid intrinsic!\n";
 132   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 133     OS << "  ";
 134     if (Ints[i].isOverloaded)
 135       OS << "true";
 136     else
 137       OS << "false";
 138     OS << ",\n";
 139   }
 140   OS << "#endif\n\n";
 141 }
 142
 143 static void EmitTypeForValueType(raw_ostream &OS, MVT::SimpleValueType VT) {
 144   if (EVT(VT).isInteger()) {
 145     unsigned BitWidth = EVT(VT).getSizeInBits();
 146     OS << "IntegerType::get(Context, " << BitWidth << ")";
 147   } else if (VT == MVT::Other) {
 148     // MVT::OtherVT is used to mean the empty struct type here.
 149     OS << "StructType::get(Context)";
 150   } else if (VT == MVT::f32) {
 151     OS << "Type::getFloatTy(Context)";
 152   } else if (VT == MVT::f64) {
 153     OS << "Type::getDoubleTy(Context)";
 154   } else if (VT == MVT::f80) {
 155     OS << "Type::getX86_FP80Ty(Context)";
 156   } else if (VT == MVT::f128) {
 157     OS << "Type::getFP128Ty(Context)";
 158   } else if (VT == MVT::ppcf128) {
 159     OS << "Type::getPPC_FP128Ty(Context)";
 160   } else if (VT == MVT::isVoid) {
 161     OS << "Type::getVoidTy(Context)";
 162   } else if (VT == MVT::Metadata) {
 163     OS << "Type::getMetadataTy(Context)";
 164   } else {
 165     assert(false && "Unsupported ValueType!");
 166   }
 167 }
 168
 169 static void EmitTypeGenerate(raw_ostream &OS, const Record *ArgType,
 170                              unsigned &ArgNo);
 171
 172 static void EmitTypeGenerate(raw_ostream &OS,
 173                              const std::vector<Record*> &ArgTypes,
 174                              unsigned &ArgNo) {
 175   if (ArgTypes.size() == 1) {
 176     EmitTypeGenerate(OS, ArgTypes.front(), ArgNo);
 177     return;
 178   }
 179
 180   OS << "StructType::get(Context, ";
 181
 182   for (std::vector<Record*>::const_iterator
 183          I = ArgTypes.begin(), E = ArgTypes.end(); I != E; ++I) {
 184     EmitTypeGenerate(OS, *I, ArgNo);
 185     OS << ", ";
 186   }
 187
 188   OS << " NULL)";
 189 }
 190
 191 static void EmitTypeGenerate(raw_ostream &OS, const Record *ArgType,
 192                              unsigned &ArgNo) {
 193   MVT::SimpleValueType VT = getValueType(ArgType->getValueAsDef("VT"));
 194
 195   if (ArgType->isSubClassOf("LLVMMatchType")) {
 196     unsigned Number = ArgType->getValueAsInt("Number");
 197     assert(Number < ArgNo && "Invalid matching number!");
 198     if (ArgType->isSubClassOf("LLVMExtendedElementVectorType"))
 199       OS << "VectorType::getExtendedElementVectorType"
 200          << "(dyn_cast<VectorType>(Tys[" << Number << "]))";
 201     else if (ArgType->isSubClassOf("LLVMTruncatedElementVectorType"))
 202       OS << "VectorType::getTruncatedElementVectorType"
 203          << "(dyn_cast<VectorType>(Tys[" << Number << "]))";
 204     else
 205       OS << "Tys[" << Number << "]";
 206   } else if (VT == MVT::iAny || VT == MVT::fAny || VT == MVT::vAny) {
 207     // NOTE: The ArgNo variable here is not the absolute argument number, it is
 208     // the index of the "arbitrary" type in the Tys array passed to the
 209     // Intrinsic::getDeclaration function. Consequently, we only want to
 210     // increment it when we actually hit an overloaded type. Getting this wrong
 211     // leads to very subtle bugs!
 212     OS << "Tys[" << ArgNo++ << "]";
 213   } else if (EVT(VT).isVector()) {
 214     EVT VVT = VT;
 215     OS << "VectorType::get(";
 216     EmitTypeForValueType(OS, VVT.getVectorElementType().getSimpleVT().SimpleTy);
 217     OS << ", " << VVT.getVectorNumElements() << ")";
 218   } else if (VT == MVT::iPTR) {
 219     OS << "PointerType::getUnqual(";
 220     EmitTypeGenerate(OS, ArgType->getValueAsDef("ElTy"), ArgNo);
 221     OS << ")";
 222   } else if (VT == MVT::iPTRAny) {
 223     // Make sure the user has passed us an argument type to overload. If not,
 224     // treat it as an ordinary (not overloaded) intrinsic.
 225     OS << "(" << ArgNo << " < numTys) ? Tys[" << ArgNo
 226     << "] : PointerType::getUnqual(";
 227     EmitTypeGenerate(OS, ArgType->getValueAsDef("ElTy"), ArgNo);
 228     OS << ")";
 229     ++ArgNo;
 230   } else if (VT == MVT::isVoid) {
 231     if (ArgNo == 0)
 232       OS << "Type::getVoidTy(Context)";
 233     else
 234       // MVT::isVoid is used to mean varargs here.
 235       OS << "...";
 236   } else {
 237     EmitTypeForValueType(OS, VT);
 238   }
 239 }
 240
 241 /// RecordListComparator - Provide a deterministic comparator for lists of
 242 /// records.
 243 namespace {
 244   typedef std::pair<std::vector<Record*>, std::vector<Record*> > RecPair;
 245   struct RecordListComparator {
 246     bool operator()(const RecPair &LHS,
 247                     const RecPair &RHS) const {
 248       unsigned i = 0;
 249       const std::vector<Record*> *LHSVec = &LHS.first;
 250       const std::vector<Record*> *RHSVec = &RHS.first;
 251       unsigned RHSSize = RHSVec->size();
 252       unsigned LHSSize = LHSVec->size();
 253
 254       do {
 255         if (i == RHSSize) return false;  // RHS is shorter than LHS.
 256         if ((*LHSVec)[i] != (*RHSVec)[i])
 257           return (*LHSVec)[i]->getName() < (*RHSVec)[i]->getName();
 258       } while (++i != LHSSize);
 259
 260       if (i != RHSSize) return true;
 261
 262       i = 0;
 263       LHSVec = &LHS.second;
 264       RHSVec = &RHS.second;
 265       RHSSize = RHSVec->size();
 266       LHSSize = LHSVec->size();
 267
 268       for (i = 0; i != LHSSize; ++i) {
 269         if (i == RHSSize) return false;  // RHS is shorter than LHS.
 270         if ((*LHSVec)[i] != (*RHSVec)[i])
 271           return (*LHSVec)[i]->getName() < (*RHSVec)[i]->getName();
 272       }
 273
 274       return i != RHSSize;
 275     }
 276   };
 277 }
 278
 279 void IntrinsicEmitter::EmitVerifier(const std::vector<CodeGenIntrinsic> &Ints,
 280                                     raw_ostream &OS) {
 281   OS << "// Verifier::visitIntrinsicFunctionCall code.\n";
 282   OS << "#ifdef GET_INTRINSIC_VERIFIER\n";
 283   OS << "  switch (ID) {\n";
 284   OS << "  default: assert(0 && \"Invalid intrinsic!\");\n";
 285
 286   // This checking can emit a lot of very common code.  To reduce the amount of
 287   // code that we emit, batch up cases that have identical types.  This avoids
 288   // problems where GCC can run out of memory compiling Verifier.cpp.
 289   typedef std::map<RecPair, std::vector<unsigned>, RecordListComparator> MapTy;
 290   MapTy UniqueArgInfos;
 291
 292   // Compute the unique argument type info.
 293   for (unsigned i = 0, e = Ints.size(); i != e; ++i)
 294     UniqueArgInfos[make_pair(Ints[i].IS.RetTypeDefs,
 295                              Ints[i].IS.ParamTypeDefs)].push_back(i);
 296
 297   // Loop through the array, emitting one comparison for each batch.
 298   for (MapTy::iterator I = UniqueArgInfos.begin(),
 299        E = UniqueArgInfos.end(); I != E; ++I) {
 300     for (unsigned i = 0, e = I->second.size(); i != e; ++i)
 301       OS << "  case Intrinsic::" << Ints[I->second[i]].EnumName << ":\t\t// "
 302          << Ints[I->second[i]].Name << "\n";
 303
 304     const RecPair &ArgTypes = I->first;
 305     const std::vector<Record*> &RetTys = ArgTypes.first;
 306     const std::vector<Record*> &ParamTys = ArgTypes.second;
 307     std::vector<unsigned> OverloadedTypeIndices;
 308
 309     OS << "    VerifyIntrinsicPrototype(ID, IF, " << RetTys.size() << ", "
 310        << ParamTys.size();
 311
 312     // Emit return types.
 313     for (unsigned j = 0, je = RetTys.size(); j != je; ++j) {
 314       Record *ArgType = RetTys[j];
 315       OS << ", ";
 316
 317       if (ArgType->isSubClassOf("LLVMMatchType")) {
 318         unsigned Number = ArgType->getValueAsInt("Number");
 319         assert(Number < OverloadedTypeIndices.size() &&
 320                "Invalid matching number!");
 321         Number = OverloadedTypeIndices[Number];
 322         if (ArgType->isSubClassOf("LLVMExtendedElementVectorType"))
 323           OS << "~(ExtendedElementVectorType | " << Number << ")";
 324         else if (ArgType->isSubClassOf("LLVMTruncatedElementVectorType"))
 325           OS << "~(TruncatedElementVectorType | " << Number << ")";
 326         else
 327           OS << "~" << Number;
 328       } else {
 329         MVT::SimpleValueType VT = getValueType(ArgType->getValueAsDef("VT"));
 330         OS << getEnumName(VT);
 331
 332         if (EVT(VT).isOverloaded())
 333           OverloadedTypeIndices.push_back(j);
 334
 335         if (VT == MVT::isVoid && j != 0 && j != je - 1)
 336           throw "Var arg type not last argument";
 337       }
 338     }
 339
 340     // Emit the parameter types.
 341     for (unsigned j = 0, je = ParamTys.size(); j != je; ++j) {
 342       Record *ArgType = ParamTys[j];
 343       OS << ", ";
 344
 345       if (ArgType->isSubClassOf("LLVMMatchType")) {
 346         unsigned Number = ArgType->getValueAsInt("Number");
 347         assert(Number < OverloadedTypeIndices.size() &&
 348                "Invalid matching number!");
 349         Number = OverloadedTypeIndices[Number];
 350         if (ArgType->isSubClassOf("LLVMExtendedElementVectorType"))
 351           OS << "~(ExtendedElementVectorType | " << Number << ")";
 352         else if (ArgType->isSubClassOf("LLVMTruncatedElementVectorType"))
 353           OS << "~(TruncatedElementVectorType | " << Number << ")";
 354         else
 355           OS << "~" << Number;
 356       } else {
 357         MVT::SimpleValueType VT = getValueType(ArgType->getValueAsDef("VT"));
 358         OS << getEnumName(VT);
 359
 360         if (EVT(VT).isOverloaded())
 361           OverloadedTypeIndices.push_back(j + RetTys.size());
 362
 363         if (VT == MVT::isVoid && j != 0 && j != je - 1)
 364           throw "Var arg type not last argument";
 365       }
 366     }
 367
 368     OS << ");\n";
 369     OS << "    break;\n";
 370   }
 371   OS << "  }\n";
 372   OS << "#endif\n\n";
 373 }
 374
 375 void IntrinsicEmitter::EmitGenerator(const std::vector<CodeGenIntrinsic> &Ints,
 376                                      raw_ostream &OS) {
 377   OS << "// Code for generating Intrinsic function declarations.\n";
 378   OS << "#ifdef GET_INTRINSIC_GENERATOR\n";
 379   OS << "  switch (id) {\n";
 380   OS << "  default: assert(0 && \"Invalid intrinsic!\");\n";
 381
 382   // Similar to GET_INTRINSIC_VERIFIER, batch up cases that have identical
 383   // types.
 384   typedef std::map<RecPair, std::vector<unsigned>, RecordListComparator> MapTy;
 385   MapTy UniqueArgInfos;
 386
 387   // Compute the unique argument type info.
 388   for (unsigned i = 0, e = Ints.size(); i != e; ++i)
 389     UniqueArgInfos[make_pair(Ints[i].IS.RetTypeDefs,
 390                              Ints[i].IS.ParamTypeDefs)].push_back(i);
 391
 392   // Loop through the array, emitting one generator for each batch.
 393   std::string IntrinsicStr = TargetPrefix + "Intrinsic::";
 394
 395   for (MapTy::iterator I = UniqueArgInfos.begin(),
 396        E = UniqueArgInfos.end(); I != E; ++I) {
 397     for (unsigned i = 0, e = I->second.size(); i != e; ++i)
 398       OS << "  case " << IntrinsicStr << Ints[I->second[i]].EnumName
 399          << ":\t\t// " << Ints[I->second[i]].Name << "\n";
 400
 401     const RecPair &ArgTypes = I->first;
 402     const std::vector<Record*> &RetTys = ArgTypes.first;
 403     const std::vector<Record*> &ParamTys = ArgTypes.second;
 404
 405     unsigned N = ParamTys.size();
 406
 407     if (N > 1 &&
 408         getValueType(ParamTys[N - 1]->getValueAsDef("VT")) == MVT::isVoid) {
 409       OS << "    IsVarArg = true;\n";
 410       --N;
 411     }
 412
 413     unsigned ArgNo = 0;
 414     OS << "    ResultTy = ";
 415     EmitTypeGenerate(OS, RetTys, ArgNo);
 416     OS << ";\n";
 417
 418     for (unsigned j = 0; j != N; ++j) {
 419       OS << "    ArgTys.push_back(";
 420       EmitTypeGenerate(OS, ParamTys[j], ArgNo);
 421       OS << ");\n";
 422     }
 423
 424     OS << "    break;\n";
 425   }
 426
 427   OS << "  }\n";
 428   OS << "#endif\n\n";
 429 }
 430
 431 /// EmitAttributes - This emits the Intrinsic::getAttributes method.
 432 void IntrinsicEmitter::
 433 EmitAttributes(const std::vector<CodeGenIntrinsic> &Ints, raw_ostream &OS) {
 434   OS << "// Add parameter attributes that are not common to all intrinsics.\n";
 435   OS << "#ifdef GET_INTRINSIC_ATTRIBUTES\n";
 436   if (TargetOnly)
 437     OS << "static AttrListPtr getAttributes(" << TargetPrefix
 438        << "Intrinsic::ID id) {";
 439   else
 440     OS << "AttrListPtr Intrinsic::getAttributes(ID id) {";
 441   OS << "  // No intrinsic can throw exceptions.\n";
 442   OS << "  Attributes Attr = Attribute::NoUnwind;\n";
 443   OS << "  switch (id) {\n";
 444   OS << "  default: break;\n";
 445   unsigned MaxArgAttrs = 0;
 446   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 447     MaxArgAttrs =
 448       std::max(MaxArgAttrs, unsigned(Ints[i].ArgumentAttributes.size()));
 449     switch (Ints[i].ModRef) {
 450     default: break;
 451     case CodeGenIntrinsic::NoMem:
 452       OS << "  case " << TargetPrefix << "Intrinsic::" << Ints[i].EnumName
 453          << ":\n";
 454       break;
 455     }
 456   }
 457   OS << "    Attr |= Attribute::ReadNone; // These do not access memory.\n";
 458   OS << "    break;\n";
 459   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 460     switch (Ints[i].ModRef) {
 461     default: break;
 462     case CodeGenIntrinsic::ReadArgMem:
 463     case CodeGenIntrinsic::ReadMem:
 464       OS << "  case " << TargetPrefix << "Intrinsic::" << Ints[i].EnumName
 465          << ":\n";
 466       break;
 467     }
 468   }
 469   OS << "    Attr |= Attribute::ReadOnly; // These do not write memory.\n";
 470   OS << "    break;\n";
 471   OS << "  }\n";
 472   OS << "  AttributeWithIndex AWI[" << MaxArgAttrs+1 << "];\n";
 473   OS << "  unsigned NumAttrs = 0;\n";
 474   OS << "  switch (id) {\n";
 475   OS << "  default: break;\n";
 476
 477   // Add argument attributes for any intrinsics that have them.
 478   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 479     if (Ints[i].ArgumentAttributes.empty()) continue;
 480
 481     OS << "  case " << TargetPrefix << "Intrinsic::" << Ints[i].EnumName
 482        << ":\n";
 483
 484     std::vector<std::pair<unsigned, CodeGenIntrinsic::ArgAttribute> > ArgAttrs =
 485       Ints[i].ArgumentAttributes;
 486     // Sort by argument index.
 487     std::sort(ArgAttrs.begin(), ArgAttrs.end());
 488
 489     unsigned NumArgsWithAttrs = 0;
 490
 491     while (!ArgAttrs.empty()) {
 492       unsigned ArgNo = ArgAttrs[0].first;
 493
 494       OS << "    AWI[" << NumArgsWithAttrs++ << "] = AttributeWithIndex::get("
 495          << ArgNo+1 << ", 0";
 496
 497       while (!ArgAttrs.empty() && ArgAttrs[0].first == ArgNo) {
 498         switch (ArgAttrs[0].second) {
 499         default: assert(0 && "Unknown arg attribute");
 500         case CodeGenIntrinsic::NoCapture:
 501           OS << "|Attribute::NoCapture";
 502           break;
 503         }
 504         ArgAttrs.erase(ArgAttrs.begin());
 505       }
 506       OS << ");\n";
 507     }
 508
 509     OS << "    NumAttrs = " << NumArgsWithAttrs << ";\n";
 510     OS << "    break;\n";
 511   }
 512
 513   OS << "  }\n";
 514   OS << "  AWI[NumAttrs] = AttributeWithIndex::get(~0, Attr);\n";
 515   OS << "  return AttrListPtr::get(AWI, NumAttrs+1);\n";
 516   OS << "}\n";
 517   OS << "#endif // GET_INTRINSIC_ATTRIBUTES\n\n";
 518 }
 519
 520 /// EmitModRefBehavior - Determine intrinsic alias analysis mod/ref behavior.
 521 void IntrinsicEmitter::
 522 EmitModRefBehavior(const std::vector<CodeGenIntrinsic> &Ints, raw_ostream &OS){
 523   OS << "// Determine intrinsic alias analysis mod/ref behavior.\n";
 524   OS << "#ifdef GET_INTRINSIC_MODREF_BEHAVIOR\n";
 525   OS << "switch (id) {\n";
 526   OS << "default:\n    return UnknownModRefBehavior;\n";
 527   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 528     if (Ints[i].ModRef == CodeGenIntrinsic::WriteMem)
 529       continue;
 530     OS << "case " << TargetPrefix << "Intrinsic::" << Ints[i].EnumName
 531       << ":\n";
 532     switch (Ints[i].ModRef) {
 533     default:
 534       assert(false && "Unknown Mod/Ref type!");
 535     case CodeGenIntrinsic::NoMem:
 536       OS << "  return DoesNotAccessMemory;\n";
 537       break;
 538     case CodeGenIntrinsic::ReadArgMem:
 539     case CodeGenIntrinsic::ReadMem:
 540       OS << "  return OnlyReadsMemory;\n";
 541       break;
 542     case CodeGenIntrinsic::WriteArgMem:
 543       OS << "  return AccessesArguments;\n";
 544       break;
 545     }
 546   }
 547   OS << "}\n";
 548   OS << "#endif // GET_INTRINSIC_MODREF_BEHAVIOR\n\n";
 549 }
 550
 551 void IntrinsicEmitter::
 552 EmitGCCBuiltinList(const std::vector<CodeGenIntrinsic> &Ints, raw_ostream &OS){
 553   OS << "// Get the GCC builtin that corresponds to an LLVM intrinsic.\n";
 554   OS << "#ifdef GET_GCC_BUILTIN_NAME\n";
 555   OS << "  switch (F->getIntrinsicID()) {\n";
 556   OS << "  default: BuiltinName = \"\"; break;\n";
 557   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 558     if (!Ints[i].GCCBuiltinName.empty()) {
 559       OS << "  case Intrinsic::" << Ints[i].EnumName << ": BuiltinName = \""
 560          << Ints[i].GCCBuiltinName << "\"; break;\n";
 561     }
 562   }
 563   OS << "  }\n";
 564   OS << "#endif\n\n";
 565 }
 566
 567 /// EmitBuiltinComparisons - Emit comparisons to determine whether the specified
 568 /// sorted range of builtin names is equal to the current builtin.  This breaks
 569 /// it down into a simple tree.
 570 ///
 571 /// At this point, we know that all the builtins in the range have the same name
 572 /// for the first 'CharStart' characters.  Only the end of the name needs to be
 573 /// discriminated.
 574 typedef std::map<std::string, std::string>::const_iterator StrMapIterator;
 575 static void EmitBuiltinComparisons(StrMapIterator Start, StrMapIterator End,
 576                                    unsigned CharStart, unsigned Indent,
 577                                    std::string TargetPrefix, raw_ostream &OS) {
 578   if (Start == End) return; // empty range.
 579
 580   // Determine what, if anything, is the same about all these strings.
 581   std::string CommonString = Start->first;
 582   unsigned NumInRange = 0;
 583   for (StrMapIterator I = Start; I != End; ++I, ++NumInRange) {
 584     // Find the first character that doesn't match.
 585     const std::string &ThisStr = I->first;
 586     unsigned NonMatchChar = CharStart;
 587     while (NonMatchChar < CommonString.size() &&
 588            NonMatchChar < ThisStr.size() &&
 589            CommonString[NonMatchChar] == ThisStr[NonMatchChar])
 590       ++NonMatchChar;
 591     // Truncate off pieces that don't match.
 592     CommonString.resize(NonMatchChar);
 593   }
 594
 595   // Just compare the rest of the string.
 596   if (NumInRange == 1) {
 597     if (CharStart != CommonString.size()) {
 598       OS << std::string(Indent*2, ' ') << "if (!memcmp(BuiltinName";
 599       if (CharStart) OS << "+" << CharStart;
 600       OS << ", \"" << (CommonString.c_str()+CharStart) << "\", ";
 601       OS << CommonString.size() - CharStart << "))\n";
 602       ++Indent;
 603     }
 604     OS << std::string(Indent*2, ' ') << "IntrinsicID = " << TargetPrefix
 605        << "Intrinsic::";
 606     OS << Start->second << ";\n";
 607     return;
 608   }
 609
 610   // At this point, we potentially have a common prefix for these builtins, emit
 611   // a check for this common prefix.
 612   if (CommonString.size() != CharStart) {
 613     OS << std::string(Indent*2, ' ') << "if (!memcmp(BuiltinName";
 614     if (CharStart) OS << "+" << CharStart;
 615     OS << ", \"" << (CommonString.c_str()+CharStart) << "\", ";
 616     OS << CommonString.size()-CharStart << ")) {\n";
 617
 618     EmitBuiltinComparisons(Start, End, CommonString.size(), Indent+1,
 619                            TargetPrefix, OS);
 620     OS << std::string(Indent*2, ' ') << "}\n";
 621     return;
 622   }
 623
 624   // Output a switch on the character that differs across the set.
 625   OS << std::string(Indent*2, ' ') << "switch (BuiltinName[" << CharStart
 626       << "]) {";
 627   if (CharStart)
 628     OS << "  // \"" << std::string(Start->first.begin(),
 629                                    Start->first.begin()+CharStart) << "\"";
 630   OS << "\n";
 631
 632   for (StrMapIterator I = Start; I != End; ) {
 633     char ThisChar = I->first[CharStart];
 634     OS << std::string(Indent*2, ' ') << "case '" << ThisChar << "':\n";
 635     // Figure out the range that has this common character.
 636     StrMapIterator NextChar = I;
 637     for (++NextChar; NextChar != End && NextChar->first[CharStart] == ThisChar;
 638          ++NextChar)
 639       /*empty*/;
 640     EmitBuiltinComparisons(I, NextChar, CharStart+1, Indent+1, TargetPrefix,OS);
 641     OS << std::string(Indent*2, ' ') << "  break;\n";
 642     I = NextChar;
 643   }
 644   OS << std::string(Indent*2, ' ') << "}\n";
 645 }
 646
 647 /// EmitTargetBuiltins - All of the builtins in the specified map are for the
 648 /// same target, and we already checked it.
 649 static void EmitTargetBuiltins(const std::map<std::string, std::string> &BIM,
 650                                const std::string &TargetPrefix,
 651                                raw_ostream &OS) {
 652   // Rearrange the builtins by length.
 653   std::vector<std::map<std::string, std::string> > BuiltinsByLen;
 654   BuiltinsByLen.reserve(100);
 655
 656   for (StrMapIterator I = BIM.begin(), E = BIM.end(); I != E; ++I) {
 657     if (I->first.size() >= BuiltinsByLen.size())
 658       BuiltinsByLen.resize(I->first.size()+1);
 659     BuiltinsByLen[I->first.size()].insert(*I);
 660   }
 661
 662   // Now that we have all the builtins by their length, emit a switch stmt.
 663   OS << "    switch (strlen(BuiltinName)) {\n";
 664   OS << "    default: break;\n";
 665   for (unsigned i = 0, e = BuiltinsByLen.size(); i != e; ++i) {
 666     if (BuiltinsByLen[i].empty()) continue;
 667     OS << "    case " << i << ":\n";
 668     EmitBuiltinComparisons(BuiltinsByLen[i].begin(), BuiltinsByLen[i].end(),
 669                            0, 3, TargetPrefix, OS);
 670     OS << "      break;\n";
 671   }
 672   OS << "    }\n";
 673 }
 674
 675
 676 void IntrinsicEmitter::
 677 EmitIntrinsicToGCCBuiltinMap(const std::vector<CodeGenIntrinsic> &Ints,
 678                              raw_ostream &OS) {
 679   typedef std::map<std::string, std::map<std::string, std::string> > BIMTy;
 680   BIMTy BuiltinMap;
 681   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 682     if (!Ints[i].GCCBuiltinName.empty()) {
 683       // Get the map for this target prefix.
 684       std::map<std::string, std::string> &BIM =BuiltinMap[Ints[i].TargetPrefix];
 685
 686       if (!BIM.insert(std::make_pair(Ints[i].GCCBuiltinName,
 687                                      Ints[i].EnumName)).second)
 688         throw "Intrinsic '" + Ints[i].TheDef->getName() +
 689               "': duplicate GCC builtin name!";
 690     }
 691   }
 692
 693   OS << "// Get the LLVM intrinsic that corresponds to a GCC builtin.\n";
 694   OS << "// This is used by the C front-end.  The GCC builtin name is passed\n";
 695   OS << "// in as BuiltinName, and a target prefix (e.g. 'ppc') is passed\n";
 696   OS << "// in as TargetPrefix.  The result is assigned to 'IntrinsicID'.\n";
 697   OS << "#ifdef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN\n";
 698
 699   if (TargetOnly) {
 700     OS << "static " << TargetPrefix << "Intrinsic::ID "
 701        << "getIntrinsicForGCCBuiltin(const char "
 702        << "*TargetPrefix, const char *BuiltinName) {\n";
 703     OS << "  " << TargetPrefix << "Intrinsic::ID IntrinsicID = ";
 704   } else {
 705     OS << "Intrinsic::ID Intrinsic::getIntrinsicForGCCBuiltin(const char "
 706        << "*TargetPrefix, const char *BuiltinName) {\n";
 707     OS << "  Intrinsic::ID IntrinsicID = ";
 708   }
 709
 710   if (TargetOnly)
 711     OS << "(" << TargetPrefix<< "Intrinsic::ID)";
 712
 713   OS << "Intrinsic::not_intrinsic;\n";
 714
 715   // Note: this could emit significantly better code if we cared.
 716   for (BIMTy::iterator I = BuiltinMap.begin(), E = BuiltinMap.end();I != E;++I){
 717     OS << "  ";
 718     if (!I->first.empty())
 719       OS << "if (!strcmp(TargetPrefix, \"" << I->first << "\")) ";
 720     else
 721       OS << "/* Target Independent Builtins */ ";
 722     OS << "{\n";
 723
 724     // Emit the comparisons for this target prefix.
 725     EmitTargetBuiltins(I->second, TargetPrefix, OS);
 726     OS << "  }\n";
 727   }
 728   OS << "  return IntrinsicID;\n";
 729   OS << "}\n";
 730   OS << "#endif\n\n";
 731 }