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   EmitPrefix(OS);
  34
  35   // Emit the enum information.
  36   EmitEnumInfo(Ints, OS);
  37
  38   // Emit the intrinsic ID -> name table.
  39   EmitIntrinsicToNameTable(Ints, OS);
  40
  41   // Emit the intrinsic ID -> overload table.
  42   EmitIntrinsicToOverloadTable(Ints, OS);
  43
  44   // Emit the function name recognizer.
  45   EmitFnNameRecognizer(Ints, OS);
  46
  47   // Emit the intrinsic verifier.
  48   EmitVerifier(Ints, OS);
  49
  50   // Emit the intrinsic declaration generator.
  51   EmitGenerator(Ints, OS);
  52
  53   // Emit the intrinsic parameter attributes.
  54   EmitAttributes(Ints, OS);
  55
  56   // Emit intrinsic alias analysis mod/ref behavior.
  57   EmitModRefBehavior(Ints, OS);
  58
  59   // Emit a list of intrinsics with corresponding GCC builtins.
  60   EmitGCCBuiltinList(Ints, OS);
  61
  62   // Emit code to translate GCC builtins into LLVM intrinsics.
  63   EmitIntrinsicToGCCBuiltinMap(Ints, OS);
  64
  65   EmitSuffix(OS);
  66 }
  67
  68 void IntrinsicEmitter::EmitPrefix(raw_ostream &OS) {
  69   OS << "// VisualStudio defines setjmp as _setjmp\n"
  70         "#if defined(_MSC_VER) && defined(setjmp)\n"
  71         "#define setjmp_undefined_for_visual_studio\n"
  72         "#undef setjmp\n"
  73         "#endif\n\n";
  74 }
  75
  76 void IntrinsicEmitter::EmitSuffix(raw_ostream &OS) {
  77   OS << "#if defined(_MSC_VER) && defined(setjmp_undefined_for_visual_studio)\n"
  78         "// let's return it to _setjmp state\n"
  79         "#define setjmp _setjmp\n"
  80         "#endif\n\n";
  81 }
  82
  83 void IntrinsicEmitter::EmitEnumInfo(const std::vector<CodeGenIntrinsic> &Ints,
  84                                     raw_ostream &OS) {
  85   OS << "// Enum values for Intrinsics.h\n";
  86   OS << "#ifdef GET_INTRINSIC_ENUM_VALUES\n";
  87   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
  88     OS << "    " << Ints[i].EnumName;
  89     OS << ((i != e-1) ? ", " : "  ");
  90     OS << std::string(40-Ints[i].EnumName.size(), ' ')
  91       << "// " << Ints[i].Name << "\n";
  92   }
  93   OS << "#endif\n\n";
  94 }
  95
  96 void IntrinsicEmitter::
  97 EmitFnNameRecognizer(const std::vector<CodeGenIntrinsic> &Ints,
  98                      raw_ostream &OS) {
  99   // Build a function name -> intrinsic name mapping.
 100   std::map<std::string, unsigned> IntMapping;
 101   for (unsigned i = 0, e = Ints.size(); i != e; ++i)
 102     IntMapping[Ints[i].Name] = i;
 103
 104   OS << "// Function name -> enum value recognizer code.\n";
 105   OS << "#ifdef GET_FUNCTION_RECOGNIZER\n";
 106   OS << "  switch (Name[5]) {\n";
 107   OS << "  default:\n";
 108   // Emit the intrinsics in sorted order.
 109   char LastChar = 0;
 110   for (std::map<std::string, unsigned>::iterator I = IntMapping.begin(),
 111        E = IntMapping.end(); I != E; ++I) {
 112     if (I->first[5] != LastChar) {
 113       LastChar = I->first[5];
 114       OS << "    break;\n";
 115       OS << "  case '" << LastChar << "':\n";
 116     }
 117
 118     // For overloaded intrinsics, only the prefix needs to match
 119     if (Ints[I->second].isOverloaded)
 120       OS << "    if (Len > " << I->first.size()
 121        << " && !memcmp(Name, \"" << I->first << ".\", "
 122        << (I->first.size() + 1) << ")) return " << TargetPrefix << "Intrinsic::"
 123        << Ints[I->second].EnumName << ";\n";
 124     else
 125       OS << "    if (Len == " << I->first.size()
 126          << " && !memcmp(Name, \"" << I->first << "\", "
 127          << I->first.size() << ")) return " << TargetPrefix << "Intrinsic::"
 128          << Ints[I->second].EnumName << ";\n";
 129   }
 130   OS << "  }\n";
 131   OS << "#endif\n\n";
 132 }
 133
 134 void IntrinsicEmitter::
 135 EmitIntrinsicToNameTable(const std::vector<CodeGenIntrinsic> &Ints,
 136                          raw_ostream &OS) {
 137   OS << "// Intrinsic ID to name table\n";
 138   OS << "#ifdef GET_INTRINSIC_NAME_TABLE\n";
 139   OS << "  // Note that entry #0 is the invalid intrinsic!\n";
 140   for (unsigned i = 0, e = Ints.size(); i != e; ++i)
 141     OS << "  \"" << Ints[i].Name << "\",\n";
 142   OS << "#endif\n\n";
 143 }
 144
 145 void IntrinsicEmitter::
 146 EmitIntrinsicToOverloadTable(const std::vector<CodeGenIntrinsic> &Ints,
 147                          raw_ostream &OS) {
 148   OS << "// Intrinsic ID to overload table\n";
 149   OS << "#ifdef GET_INTRINSIC_OVERLOAD_TABLE\n";
 150   OS << "  // Note that entry #0 is the invalid intrinsic!\n";
 151   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 152     OS << "  ";
 153     if (Ints[i].isOverloaded)
 154       OS << "true";
 155     else
 156       OS << "false";
 157     OS << ",\n";
 158   }
 159   OS << "#endif\n\n";
 160 }
 161
 162 static void EmitTypeForValueType(raw_ostream &OS, MVT::SimpleValueType VT) {
 163   if (EVT(VT).isInteger()) {
 164     unsigned BitWidth = EVT(VT).getSizeInBits();
 165     OS << "IntegerType::get(Context, " << BitWidth << ")";
 166   } else if (VT == MVT::Other) {
 167     // MVT::OtherVT is used to mean the empty struct type here.
 168     OS << "StructType::get(Context)";
 169   } else if (VT == MVT::f32) {
 170     OS << "Type::getFloatTy(Context)";
 171   } else if (VT == MVT::f64) {
 172     OS << "Type::getDoubleTy(Context)";
 173   } else if (VT == MVT::f80) {
 174     OS << "Type::getX86_FP80Ty(Context)";
 175   } else if (VT == MVT::f128) {
 176     OS << "Type::getFP128Ty(Context)";
 177   } else if (VT == MVT::ppcf128) {
 178     OS << "Type::getPPC_FP128Ty(Context)";
 179   } else if (VT == MVT::isVoid) {
 180     OS << "Type::getVoidTy(Context)";
 181   } else if (VT == MVT::Metadata) {
 182     OS << "Type::getMetadataTy(Context)";
 183   } else {
 184     assert(false && "Unsupported ValueType!");
 185   }
 186 }
 187
 188 static void EmitTypeGenerate(raw_ostream &OS, const Record *ArgType,
 189                              unsigned &ArgNo);
 190
 191 static void EmitTypeGenerate(raw_ostream &OS,
 192                              const std::vector<Record*> &ArgTypes,
 193                              unsigned &ArgNo) {
 194   if (ArgTypes.empty())
 195     return EmitTypeForValueType(OS, MVT::isVoid);
 196
 197   if (ArgTypes.size() == 1)
 198     return EmitTypeGenerate(OS, ArgTypes.front(), ArgNo);
 199
 200   OS << "StructType::get(Context, ";
 201
 202   for (std::vector<Record*>::const_iterator
 203          I = ArgTypes.begin(), E = ArgTypes.end(); I != E; ++I) {
 204     EmitTypeGenerate(OS, *I, ArgNo);
 205     OS << ", ";
 206   }
 207
 208   OS << " NULL)";
 209 }
 210
 211 static void EmitTypeGenerate(raw_ostream &OS, const Record *ArgType,
 212                              unsigned &ArgNo) {
 213   MVT::SimpleValueType VT = getValueType(ArgType->getValueAsDef("VT"));
 214
 215   if (ArgType->isSubClassOf("LLVMMatchType")) {
 216     unsigned Number = ArgType->getValueAsInt("Number");
 217     assert(Number < ArgNo && "Invalid matching number!");
 218     if (ArgType->isSubClassOf("LLVMExtendedElementVectorType"))
 219       OS << "VectorType::getExtendedElementVectorType"
 220          << "(dyn_cast<VectorType>(Tys[" << Number << "]))";
 221     else if (ArgType->isSubClassOf("LLVMTruncatedElementVectorType"))
 222       OS << "VectorType::getTruncatedElementVectorType"
 223          << "(dyn_cast<VectorType>(Tys[" << Number << "]))";
 224     else
 225       OS << "Tys[" << Number << "]";
 226   } else if (VT == MVT::iAny || VT == MVT::fAny || VT == MVT::vAny) {
 227     // NOTE: The ArgNo variable here is not the absolute argument number, it is
 228     // the index of the "arbitrary" type in the Tys array passed to the
 229     // Intrinsic::getDeclaration function. Consequently, we only want to
 230     // increment it when we actually hit an overloaded type. Getting this wrong
 231     // leads to very subtle bugs!
 232     OS << "Tys[" << ArgNo++ << "]";
 233   } else if (EVT(VT).isVector()) {
 234     EVT VVT = VT;
 235     OS << "VectorType::get(";
 236     EmitTypeForValueType(OS, VVT.getVectorElementType().getSimpleVT().SimpleTy);
 237     OS << ", " << VVT.getVectorNumElements() << ")";
 238   } else if (VT == MVT::iPTR) {
 239     OS << "PointerType::getUnqual(";
 240     EmitTypeGenerate(OS, ArgType->getValueAsDef("ElTy"), ArgNo);
 241     OS << ")";
 242   } else if (VT == MVT::iPTRAny) {
 243     // Make sure the user has passed us an argument type to overload. If not,
 244     // treat it as an ordinary (not overloaded) intrinsic.
 245     OS << "(" << ArgNo << " < numTys) ? Tys[" << ArgNo
 246     << "] : PointerType::getUnqual(";
 247     EmitTypeGenerate(OS, ArgType->getValueAsDef("ElTy"), ArgNo);
 248     OS << ")";
 249     ++ArgNo;
 250   } else if (VT == MVT::isVoid) {
 251     if (ArgNo == 0)
 252       OS << "Type::getVoidTy(Context)";
 253     else
 254       // MVT::isVoid is used to mean varargs here.
 255       OS << "...";
 256   } else {
 257     EmitTypeForValueType(OS, VT);
 258   }
 259 }
 260
 261 /// RecordListComparator - Provide a deterministic comparator for lists of
 262 /// records.
 263 namespace {
 264   typedef std::pair<std::vector<Record*>, std::vector<Record*> > RecPair;
 265   struct RecordListComparator {
 266     bool operator()(const RecPair &LHS,
 267                     const RecPair &RHS) const {
 268       unsigned i = 0;
 269       const std::vector<Record*> *LHSVec = &LHS.first;
 270       const std::vector<Record*> *RHSVec = &RHS.first;
 271       unsigned RHSSize = RHSVec->size();
 272       unsigned LHSSize = LHSVec->size();
 273
 274       for (; i != LHSSize; ++i) {
 275         if (i == RHSSize) return false;  // RHS is shorter than LHS.
 276         if ((*LHSVec)[i] != (*RHSVec)[i])
 277           return (*LHSVec)[i]->getName() < (*RHSVec)[i]->getName();
 278       }
 279
 280       if (i != RHSSize) return true;
 281
 282       i = 0;
 283       LHSVec = &LHS.second;
 284       RHSVec = &RHS.second;
 285       RHSSize = RHSVec->size();
 286       LHSSize = LHSVec->size();
 287
 288       for (i = 0; i != LHSSize; ++i) {
 289         if (i == RHSSize) return false;  // RHS is shorter than LHS.
 290         if ((*LHSVec)[i] != (*RHSVec)[i])
 291           return (*LHSVec)[i]->getName() < (*RHSVec)[i]->getName();
 292       }
 293
 294       return i != RHSSize;
 295     }
 296   };
 297 }
 298
 299 void IntrinsicEmitter::EmitVerifier(const std::vector<CodeGenIntrinsic> &Ints,
 300                                     raw_ostream &OS) {
 301   OS << "// Verifier::visitIntrinsicFunctionCall code.\n";
 302   OS << "#ifdef GET_INTRINSIC_VERIFIER\n";
 303   OS << "  switch (ID) {\n";
 304   OS << "  default: assert(0 && \"Invalid intrinsic!\");\n";
 305
 306   // This checking can emit a lot of very common code.  To reduce the amount of
 307   // code that we emit, batch up cases that have identical types.  This avoids
 308   // problems where GCC can run out of memory compiling Verifier.cpp.
 309   typedef std::map<RecPair, std::vector<unsigned>, RecordListComparator> MapTy;
 310   MapTy UniqueArgInfos;
 311
 312   // Compute the unique argument type info.
 313   for (unsigned i = 0, e = Ints.size(); i != e; ++i)
 314     UniqueArgInfos[make_pair(Ints[i].IS.RetTypeDefs,
 315                              Ints[i].IS.ParamTypeDefs)].push_back(i);
 316
 317   // Loop through the array, emitting one comparison for each batch.
 318   for (MapTy::iterator I = UniqueArgInfos.begin(),
 319        E = UniqueArgInfos.end(); I != E; ++I) {
 320     for (unsigned i = 0, e = I->second.size(); i != e; ++i)
 321       OS << "  case Intrinsic::" << Ints[I->second[i]].EnumName << ":\t\t// "
 322          << Ints[I->second[i]].Name << "\n";
 323
 324     const RecPair &ArgTypes = I->first;
 325     const std::vector<Record*> &RetTys = ArgTypes.first;
 326     const std::vector<Record*> &ParamTys = ArgTypes.second;
 327     std::vector<unsigned> OverloadedTypeIndices;
 328
 329     OS << "    VerifyIntrinsicPrototype(ID, IF, " << RetTys.size() << ", "
 330        << ParamTys.size();
 331
 332     // Emit return types.
 333     for (unsigned j = 0, je = RetTys.size(); j != je; ++j) {
 334       Record *ArgType = RetTys[j];
 335       OS << ", ";
 336
 337       if (ArgType->isSubClassOf("LLVMMatchType")) {
 338         unsigned Number = ArgType->getValueAsInt("Number");
 339         assert(Number < OverloadedTypeIndices.size() &&
 340                "Invalid matching number!");
 341         Number = OverloadedTypeIndices[Number];
 342         if (ArgType->isSubClassOf("LLVMExtendedElementVectorType"))
 343           OS << "~(ExtendedElementVectorType | " << Number << ")";
 344         else if (ArgType->isSubClassOf("LLVMTruncatedElementVectorType"))
 345           OS << "~(TruncatedElementVectorType | " << Number << ")";
 346         else
 347           OS << "~" << Number;
 348       } else {
 349         MVT::SimpleValueType VT = getValueType(ArgType->getValueAsDef("VT"));
 350         OS << getEnumName(VT);
 351
 352         if (EVT(VT).isOverloaded())
 353           OverloadedTypeIndices.push_back(j);
 354
 355         if (VT == MVT::isVoid && j != 0 && j != je - 1)
 356           throw "Var arg type not last argument";
 357       }
 358     }
 359
 360     // Emit the parameter types.
 361     for (unsigned j = 0, je = ParamTys.size(); j != je; ++j) {
 362       Record *ArgType = ParamTys[j];
 363       OS << ", ";
 364
 365       if (ArgType->isSubClassOf("LLVMMatchType")) {
 366         unsigned Number = ArgType->getValueAsInt("Number");
 367         assert(Number < OverloadedTypeIndices.size() &&
 368                "Invalid matching number!");
 369         Number = OverloadedTypeIndices[Number];
 370         if (ArgType->isSubClassOf("LLVMExtendedElementVectorType"))
 371           OS << "~(ExtendedElementVectorType | " << Number << ")";
 372         else if (ArgType->isSubClassOf("LLVMTruncatedElementVectorType"))
 373           OS << "~(TruncatedElementVectorType | " << Number << ")";
 374         else
 375           OS << "~" << Number;
 376       } else {
 377         MVT::SimpleValueType VT = getValueType(ArgType->getValueAsDef("VT"));
 378         OS << getEnumName(VT);
 379
 380         if (EVT(VT).isOverloaded())
 381           OverloadedTypeIndices.push_back(j + RetTys.size());
 382
 383         if (VT == MVT::isVoid && j != 0 && j != je - 1)
 384           throw "Var arg type not last argument";
 385       }
 386     }
 387
 388     OS << ");\n";
 389     OS << "    break;\n";
 390   }
 391   OS << "  }\n";
 392   OS << "#endif\n\n";
 393 }
 394
 395 void IntrinsicEmitter::EmitGenerator(const std::vector<CodeGenIntrinsic> &Ints,
 396                                      raw_ostream &OS) {
 397   OS << "// Code for generating Intrinsic function declarations.\n";
 398   OS << "#ifdef GET_INTRINSIC_GENERATOR\n";
 399   OS << "  switch (id) {\n";
 400   OS << "  default: assert(0 && \"Invalid intrinsic!\");\n";
 401
 402   // Similar to GET_INTRINSIC_VERIFIER, batch up cases that have identical
 403   // types.
 404   typedef std::map<RecPair, std::vector<unsigned>, RecordListComparator> MapTy;
 405   MapTy UniqueArgInfos;
 406
 407   // Compute the unique argument type info.
 408   for (unsigned i = 0, e = Ints.size(); i != e; ++i)
 409     UniqueArgInfos[make_pair(Ints[i].IS.RetTypeDefs,
 410                              Ints[i].IS.ParamTypeDefs)].push_back(i);
 411
 412   // Loop through the array, emitting one generator for each batch.
 413   std::string IntrinsicStr = TargetPrefix + "Intrinsic::";
 414
 415   for (MapTy::iterator I = UniqueArgInfos.begin(),
 416        E = UniqueArgInfos.end(); I != E; ++I) {
 417     for (unsigned i = 0, e = I->second.size(); i != e; ++i)
 418       OS << "  case " << IntrinsicStr << Ints[I->second[i]].EnumName
 419          << ":\t\t// " << Ints[I->second[i]].Name << "\n";
 420
 421     const RecPair &ArgTypes = I->first;
 422     const std::vector<Record*> &RetTys = ArgTypes.first;
 423     const std::vector<Record*> &ParamTys = ArgTypes.second;
 424
 425     unsigned N = ParamTys.size();
 426
 427     if (N > 1 &&
 428         getValueType(ParamTys[N - 1]->getValueAsDef("VT")) == MVT::isVoid) {
 429       OS << "    IsVarArg = true;\n";
 430       --N;
 431     }
 432
 433     unsigned ArgNo = 0;
 434     OS << "    ResultTy = ";
 435     EmitTypeGenerate(OS, RetTys, ArgNo);
 436     OS << ";\n";
 437
 438     for (unsigned j = 0; j != N; ++j) {
 439       OS << "    ArgTys.push_back(";
 440       EmitTypeGenerate(OS, ParamTys[j], ArgNo);
 441       OS << ");\n";
 442     }
 443
 444     OS << "    break;\n";
 445   }
 446
 447   OS << "  }\n";
 448   OS << "#endif\n\n";
 449 }
 450
 451 /// EmitAttributes - This emits the Intrinsic::getAttributes method.
 452 void IntrinsicEmitter::
 453 EmitAttributes(const std::vector<CodeGenIntrinsic> &Ints, raw_ostream &OS) {
 454   OS << "// Add parameter attributes that are not common to all intrinsics.\n";
 455   OS << "#ifdef GET_INTRINSIC_ATTRIBUTES\n";
 456   if (TargetOnly)
 457     OS << "static AttrListPtr getAttributes(" << TargetPrefix
 458        << "Intrinsic::ID id) {";
 459   else
 460     OS << "AttrListPtr Intrinsic::getAttributes(ID id) {";
 461   OS << "  // No intrinsic can throw exceptions.\n";
 462   OS << "  Attributes Attr = Attribute::NoUnwind;\n";
 463   OS << "  switch (id) {\n";
 464   OS << "  default: break;\n";
 465   unsigned MaxArgAttrs = 0;
 466   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 467     MaxArgAttrs =
 468       std::max(MaxArgAttrs, unsigned(Ints[i].ArgumentAttributes.size()));
 469     switch (Ints[i].ModRef) {
 470     default: break;
 471     case CodeGenIntrinsic::NoMem:
 472       OS << "  case " << TargetPrefix << "Intrinsic::" << Ints[i].EnumName
 473          << ":\n";
 474       break;
 475     }
 476   }
 477   OS << "    Attr |= Attribute::ReadNone; // These do not access memory.\n";
 478   OS << "    break;\n";
 479   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 480     switch (Ints[i].ModRef) {
 481     default: break;
 482     case CodeGenIntrinsic::ReadArgMem:
 483     case CodeGenIntrinsic::ReadMem:
 484       OS << "  case " << TargetPrefix << "Intrinsic::" << Ints[i].EnumName
 485          << ":\n";
 486       break;
 487     }
 488   }
 489   OS << "    Attr |= Attribute::ReadOnly; // These do not write memory.\n";
 490   OS << "    break;\n";
 491   OS << "  }\n";
 492   OS << "  AttributeWithIndex AWI[" << MaxArgAttrs+1 << "];\n";
 493   OS << "  unsigned NumAttrs = 0;\n";
 494   OS << "  switch (id) {\n";
 495   OS << "  default: break;\n";
 496
 497   // Add argument attributes for any intrinsics that have them.
 498   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 499     if (Ints[i].ArgumentAttributes.empty()) continue;
 500
 501     OS << "  case " << TargetPrefix << "Intrinsic::" << Ints[i].EnumName
 502        << ":\n";
 503
 504     std::vector<std::pair<unsigned, CodeGenIntrinsic::ArgAttribute> > ArgAttrs =
 505       Ints[i].ArgumentAttributes;
 506     // Sort by argument index.
 507     std::sort(ArgAttrs.begin(), ArgAttrs.end());
 508
 509     unsigned NumArgsWithAttrs = 0;
 510
 511     while (!ArgAttrs.empty()) {
 512       unsigned ArgNo = ArgAttrs[0].first;
 513
 514       OS << "    AWI[" << NumArgsWithAttrs++ << "] = AttributeWithIndex::get("
 515          << ArgNo+1 << ", 0";
 516
 517       while (!ArgAttrs.empty() && ArgAttrs[0].first == ArgNo) {
 518         switch (ArgAttrs[0].second) {
 519         default: assert(0 && "Unknown arg attribute");
 520         case CodeGenIntrinsic::NoCapture:
 521           OS << "|Attribute::NoCapture";
 522           break;
 523         }
 524         ArgAttrs.erase(ArgAttrs.begin());
 525       }
 526       OS << ");\n";
 527     }
 528
 529     OS << "    NumAttrs = " << NumArgsWithAttrs << ";\n";
 530     OS << "    break;\n";
 531   }
 532
 533   OS << "  }\n";
 534   OS << "  AWI[NumAttrs] = AttributeWithIndex::get(~0, Attr);\n";
 535   OS << "  return AttrListPtr::get(AWI, NumAttrs+1);\n";
 536   OS << "}\n";
 537   OS << "#endif // GET_INTRINSIC_ATTRIBUTES\n\n";
 538 }
 539
 540 /// EmitModRefBehavior - Determine intrinsic alias analysis mod/ref behavior.
 541 void IntrinsicEmitter::
 542 EmitModRefBehavior(const std::vector<CodeGenIntrinsic> &Ints, raw_ostream &OS){
 543   OS << "// Determine intrinsic alias analysis mod/ref behavior.\n";
 544   OS << "#ifdef GET_INTRINSIC_MODREF_BEHAVIOR\n";
 545   OS << "switch (iid) {\n";
 546   OS << "default:\n    return UnknownModRefBehavior;\n";
 547   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 548     if (Ints[i].ModRef == CodeGenIntrinsic::ReadWriteMem)
 549       continue;
 550     OS << "case " << TargetPrefix << "Intrinsic::" << Ints[i].EnumName
 551       << ":\n";
 552     switch (Ints[i].ModRef) {
 553     default:
 554       assert(false && "Unknown Mod/Ref type!");
 555     case CodeGenIntrinsic::NoMem:
 556       OS << "  return DoesNotAccessMemory;\n";
 557       break;
 558     case CodeGenIntrinsic::ReadArgMem:
 559     case CodeGenIntrinsic::ReadMem:
 560       OS << "  return OnlyReadsMemory;\n";
 561       break;
 562     case CodeGenIntrinsic::ReadWriteArgMem:
 563       OS << "  return AccessesArguments;\n";
 564       break;
 565     }
 566   }
 567   OS << "}\n";
 568   OS << "#endif // GET_INTRINSIC_MODREF_BEHAVIOR\n\n";
 569 }
 570
 571 void IntrinsicEmitter::
 572 EmitGCCBuiltinList(const std::vector<CodeGenIntrinsic> &Ints, raw_ostream &OS){
 573   OS << "// Get the GCC builtin that corresponds to an LLVM intrinsic.\n";
 574   OS << "#ifdef GET_GCC_BUILTIN_NAME\n";
 575   OS << "  switch (F->getIntrinsicID()) {\n";
 576   OS << "  default: BuiltinName = \"\"; break;\n";
 577   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 578     if (!Ints[i].GCCBuiltinName.empty()) {
 579       OS << "  case Intrinsic::" << Ints[i].EnumName << ": BuiltinName = \""
 580          << Ints[i].GCCBuiltinName << "\"; break;\n";
 581     }
 582   }
 583   OS << "  }\n";
 584   OS << "#endif\n\n";
 585 }
 586
 587 /// EmitBuiltinComparisons - Emit comparisons to determine whether the specified
 588 /// sorted range of builtin names is equal to the current builtin.  This breaks
 589 /// it down into a simple tree.
 590 ///
 591 /// At this point, we know that all the builtins in the range have the same name
 592 /// for the first 'CharStart' characters.  Only the end of the name needs to be
 593 /// discriminated.
 594 typedef std::map<std::string, std::string>::const_iterator StrMapIterator;
 595 static void EmitBuiltinComparisons(StrMapIterator Start, StrMapIterator End,
 596                                    unsigned CharStart, unsigned Indent,
 597                                    std::string TargetPrefix, raw_ostream &OS) {
 598   if (Start == End) return; // empty range.
 599
 600   // Determine what, if anything, is the same about all these strings.
 601   std::string CommonString = Start->first;
 602   unsigned NumInRange = 0;
 603   for (StrMapIterator I = Start; I != End; ++I, ++NumInRange) {
 604     // Find the first character that doesn't match.
 605     const std::string &ThisStr = I->first;
 606     unsigned NonMatchChar = CharStart;
 607     while (NonMatchChar < CommonString.size() &&
 608            NonMatchChar < ThisStr.size() &&
 609            CommonString[NonMatchChar] == ThisStr[NonMatchChar])
 610       ++NonMatchChar;
 611     // Truncate off pieces that don't match.
 612     CommonString.resize(NonMatchChar);
 613   }
 614
 615   // Just compare the rest of the string.
 616   if (NumInRange == 1) {
 617     if (CharStart != CommonString.size()) {
 618       OS << std::string(Indent*2, ' ') << "if (!memcmp(BuiltinName";
 619       if (CharStart) OS << "+" << CharStart;
 620       OS << ", \"" << (CommonString.c_str()+CharStart) << "\", ";
 621       OS << CommonString.size() - CharStart << "))\n";
 622       ++Indent;
 623     }
 624     OS << std::string(Indent*2, ' ') << "IntrinsicID = " << TargetPrefix
 625        << "Intrinsic::";
 626     OS << Start->second << ";\n";
 627     return;
 628   }
 629
 630   // At this point, we potentially have a common prefix for these builtins, emit
 631   // a check for this common prefix.
 632   if (CommonString.size() != CharStart) {
 633     OS << std::string(Indent*2, ' ') << "if (!memcmp(BuiltinName";
 634     if (CharStart) OS << "+" << CharStart;
 635     OS << ", \"" << (CommonString.c_str()+CharStart) << "\", ";
 636     OS << CommonString.size()-CharStart << ")) {\n";
 637
 638     EmitBuiltinComparisons(Start, End, CommonString.size(), Indent+1,
 639                            TargetPrefix, OS);
 640     OS << std::string(Indent*2, ' ') << "}\n";
 641     return;
 642   }
 643
 644   // Output a switch on the character that differs across the set.
 645   OS << std::string(Indent*2, ' ') << "switch (BuiltinName[" << CharStart
 646       << "]) {";
 647   if (CharStart)
 648     OS << "  // \"" << std::string(Start->first.begin(),
 649                                    Start->first.begin()+CharStart) << "\"";
 650   OS << "\n";
 651
 652   for (StrMapIterator I = Start; I != End; ) {
 653     char ThisChar = I->first[CharStart];
 654     OS << std::string(Indent*2, ' ') << "case '" << ThisChar << "':\n";
 655     // Figure out the range that has this common character.
 656     StrMapIterator NextChar = I;
 657     for (++NextChar; NextChar != End && NextChar->first[CharStart] == ThisChar;
 658          ++NextChar)
 659       /*empty*/;
 660     EmitBuiltinComparisons(I, NextChar, CharStart+1, Indent+1, TargetPrefix,OS);
 661     OS << std::string(Indent*2, ' ') << "  break;\n";
 662     I = NextChar;
 663   }
 664   OS << std::string(Indent*2, ' ') << "}\n";
 665 }
 666
 667 /// EmitTargetBuiltins - All of the builtins in the specified map are for the
 668 /// same target, and we already checked it.
 669 static void EmitTargetBuiltins(const std::map<std::string, std::string> &BIM,
 670                                const std::string &TargetPrefix,
 671                                raw_ostream &OS) {
 672   // Rearrange the builtins by length.
 673   std::vector<std::map<std::string, std::string> > BuiltinsByLen;
 674   BuiltinsByLen.reserve(100);
 675
 676   for (StrMapIterator I = BIM.begin(), E = BIM.end(); I != E; ++I) {
 677     if (I->first.size() >= BuiltinsByLen.size())
 678       BuiltinsByLen.resize(I->first.size()+1);
 679     BuiltinsByLen[I->first.size()].insert(*I);
 680   }
 681
 682   // Now that we have all the builtins by their length, emit a switch stmt.
 683   OS << "    switch (strlen(BuiltinName)) {\n";
 684   OS << "    default: break;\n";
 685   for (unsigned i = 0, e = BuiltinsByLen.size(); i != e; ++i) {
 686     if (BuiltinsByLen[i].empty()) continue;
 687     OS << "    case " << i << ":\n";
 688     EmitBuiltinComparisons(BuiltinsByLen[i].begin(), BuiltinsByLen[i].end(),
 689                            0, 3, TargetPrefix, OS);
 690     OS << "      break;\n";
 691   }
 692   OS << "    }\n";
 693 }
 694
 695
 696 void IntrinsicEmitter::
 697 EmitIntrinsicToGCCBuiltinMap(const std::vector<CodeGenIntrinsic> &Ints,
 698                              raw_ostream &OS) {
 699   typedef std::map<std::string, std::map<std::string, std::string> > BIMTy;
 700   BIMTy BuiltinMap;
 701   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 702     if (!Ints[i].GCCBuiltinName.empty()) {
 703       // Get the map for this target prefix.
 704       std::map<std::string, std::string> &BIM =BuiltinMap[Ints[i].TargetPrefix];
 705
 706       if (!BIM.insert(std::make_pair(Ints[i].GCCBuiltinName,
 707                                      Ints[i].EnumName)).second)
 708         throw "Intrinsic '" + Ints[i].TheDef->getName() +
 709               "': duplicate GCC builtin name!";
 710     }
 711   }
 712
 713   OS << "// Get the LLVM intrinsic that corresponds to a GCC builtin.\n";
 714   OS << "// This is used by the C front-end.  The GCC builtin name is passed\n";
 715   OS << "// in as BuiltinName, and a target prefix (e.g. 'ppc') is passed\n";
 716   OS << "// in as TargetPrefix.  The result is assigned to 'IntrinsicID'.\n";
 717   OS << "#ifdef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN\n";
 718
 719   if (TargetOnly) {
 720     OS << "static " << TargetPrefix << "Intrinsic::ID "
 721        << "getIntrinsicForGCCBuiltin(const char "
 722        << "*TargetPrefix, const char *BuiltinName) {\n";
 723     OS << "  " << TargetPrefix << "Intrinsic::ID IntrinsicID = ";
 724   } else {
 725     OS << "Intrinsic::ID Intrinsic::getIntrinsicForGCCBuiltin(const char "
 726        << "*TargetPrefix, const char *BuiltinName) {\n";
 727     OS << "  Intrinsic::ID IntrinsicID = ";
 728   }
 729
 730   if (TargetOnly)
 731     OS << "(" << TargetPrefix<< "Intrinsic::ID)";
 732
 733   OS << "Intrinsic::not_intrinsic;\n";
 734
 735   // Note: this could emit significantly better code if we cared.
 736   for (BIMTy::iterator I = BuiltinMap.begin(), E = BuiltinMap.end();I != E;++I){
 737     OS << "  ";
 738     if (!I->first.empty())
 739       OS << "if (!strcmp(TargetPrefix, \"" << I->first << "\")) ";
 740     else
 741       OS << "/* Target Independent Builtins */ ";
 742     OS << "{\n";
 743
 744     // Emit the comparisons for this target prefix.
 745     EmitTargetBuiltins(I->second, TargetPrefix, OS);
 746     OS << "  }\n";
 747   }
 748   OS << "  return IntrinsicID;\n";
 749   OS << "}\n";
 750   OS << "#endif\n\n";
 751 }