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 "StringMatcher.h"
  18 #include "llvm/ADT/StringExtras.h"
  19 #include <algorithm>
  20 using namespace llvm;
  21
  22 //===----------------------------------------------------------------------===//
  23 // IntrinsicEmitter Implementation
  24 //===----------------------------------------------------------------------===//
  25
  26 void IntrinsicEmitter::run(raw_ostream &OS) {
  27   EmitSourceFileHeader("Intrinsic Function Source Fragment", OS);
  28
  29   std::vector<CodeGenIntrinsic> Ints = LoadIntrinsics(Records, TargetOnly);
  30
  31   if (TargetOnly && !Ints.empty())
  32     TargetPrefix = Ints[0].TargetPrefix;
  33
  34   EmitPrefix(OS);
  35
  36   // Emit the enum information.
  37   EmitEnumInfo(Ints, OS);
  38
  39   // Emit the intrinsic ID -> name table.
  40   EmitIntrinsicToNameTable(Ints, OS);
  41
  42   // Emit the intrinsic ID -> overload table.
  43   EmitIntrinsicToOverloadTable(Ints, OS);
  44
  45   // Emit the function name recognizer.
  46   EmitFnNameRecognizer(Ints, OS);
  47
  48   // Emit the intrinsic verifier.
  49   EmitVerifier(Ints, OS);
  50
  51   // Emit the intrinsic declaration generator.
  52   EmitGenerator(Ints, OS);
  53
  54   // Emit the intrinsic parameter attributes.
  55   EmitAttributes(Ints, OS);
  56
  57   // Emit intrinsic alias analysis mod/ref behavior.
  58   EmitModRefBehavior(Ints, OS);
  59
  60   // Emit a list of intrinsics with corresponding GCC builtins.
  61   EmitGCCBuiltinList(Ints, OS);
  62
  63   // Emit code to translate GCC builtins into LLVM intrinsics.
  64   EmitIntrinsicToGCCBuiltinMap(Ints, OS);
  65
  66   EmitSuffix(OS);
  67 }
  68
  69 void IntrinsicEmitter::EmitPrefix(raw_ostream &OS) {
  70   OS << "// VisualStudio defines setjmp as _setjmp\n"
  71         "#if defined(_MSC_VER) && defined(setjmp) && \\\n"
  72         "                         !defined(setjmp_undefined_for_msvc)\n"
  73         "#  pragma push_macro(\"setjmp\")\n"
  74         "#  undef setjmp\n"
  75         "#  define setjmp_undefined_for_msvc\n"
  76         "#endif\n\n";
  77 }
  78
  79 void IntrinsicEmitter::EmitSuffix(raw_ostream &OS) {
  80   OS << "#if defined(_MSC_VER) && defined(setjmp_undefined_for_msvc)\n"
  81         "// let's return it to _setjmp state\n"
  82         "#  pragma pop_macro(\"setjmp\")\n"
  83         "#  undef setjmp_undefined_for_msvc\n"
  84         "#endif\n\n";
  85 }
  86
  87 void IntrinsicEmitter::EmitEnumInfo(const std::vector<CodeGenIntrinsic> &Ints,
  88                                     raw_ostream &OS) {
  89   OS << "// Enum values for Intrinsics.h\n";
  90   OS << "#ifdef GET_INTRINSIC_ENUM_VALUES\n";
  91   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
  92     OS << "    " << Ints[i].EnumName;
  93     OS << ((i != e-1) ? ", " : "  ");
  94     OS << std::string(40-Ints[i].EnumName.size(), ' ')
  95       << "// " << Ints[i].Name << "\n";
  96   }
  97   OS << "#endif\n\n";
  98 }
  99
 100 void IntrinsicEmitter::
 101 EmitFnNameRecognizer(const std::vector<CodeGenIntrinsic> &Ints,
 102                      raw_ostream &OS) {
 103   // Build a 'first character of function name' -> intrinsic # mapping.
 104   std::map<char, std::vector<unsigned> > IntMapping;
 105   for (unsigned i = 0, e = Ints.size(); i != e; ++i)
 106     IntMapping[Ints[i].Name[5]].push_back(i);
 107
 108   OS << "// Function name -> enum value recognizer code.\n";
 109   OS << "#ifdef GET_FUNCTION_RECOGNIZER\n";
 110   OS << "  StringRef NameR(Name+6, Len-6);   // Skip over 'llvm.'\n";
 111   OS << "  switch (Name[5]) {                  // Dispatch on first letter.\n";
 112   OS << "  default: break;\n";
 113   // Emit the intrinsic matching stuff by first letter.
 114   for (std::map<char, std::vector<unsigned> >::iterator I = IntMapping.begin(),
 115        E = IntMapping.end(); I != E; ++I) {
 116     OS << "  case '" << I->first << "':\n";
 117     std::vector<unsigned> &IntList = I->second;
 118
 119     // Emit all the overloaded intrinsics first, build a table of the
 120     // non-overloaded ones.
 121     std::vector<StringMatcher::StringPair> MatchTable;
 122
 123     for (unsigned i = 0, e = IntList.size(); i != e; ++i) {
 124       unsigned IntNo = IntList[i];
 125       std::string Result = "return " + TargetPrefix + "Intrinsic::" +
 126         Ints[IntNo].EnumName + ";";
 127
 128       if (!Ints[IntNo].isOverloaded) {
 129         MatchTable.push_back(std::make_pair(Ints[IntNo].Name.substr(6),Result));
 130         continue;
 131       }
 132
 133       // For overloaded intrinsics, only the prefix needs to match
 134       std::string TheStr = Ints[IntNo].Name.substr(6);
 135       TheStr += '.';  // Require "bswap." instead of bswap.
 136       OS << "    if (NameR.startswith(\"" << TheStr << "\")) "
 137          << Result << '\n';
 138     }
 139
 140     // Emit the matcher logic for the fixed length strings.
 141     StringMatcher("NameR", MatchTable, OS).Emit(1);
 142     OS << "    break;  // end of '" << I->first << "' case.\n";
 143   }
 144
 145   OS << "  }\n";
 146   OS << "#endif\n\n";
 147 }
 148
 149 void IntrinsicEmitter::
 150 EmitIntrinsicToNameTable(const std::vector<CodeGenIntrinsic> &Ints,
 151                          raw_ostream &OS) {
 152   OS << "// Intrinsic ID to name table\n";
 153   OS << "#ifdef GET_INTRINSIC_NAME_TABLE\n";
 154   OS << "  // Note that entry #0 is the invalid intrinsic!\n";
 155   for (unsigned i = 0, e = Ints.size(); i != e; ++i)
 156     OS << "  \"" << Ints[i].Name << "\",\n";
 157   OS << "#endif\n\n";
 158 }
 159
 160 void IntrinsicEmitter::
 161 EmitIntrinsicToOverloadTable(const std::vector<CodeGenIntrinsic> &Ints,
 162                          raw_ostream &OS) {
 163   OS << "// Intrinsic ID to overload table\n";
 164   OS << "#ifdef GET_INTRINSIC_OVERLOAD_TABLE\n";
 165   OS << "  // Note that entry #0 is the invalid intrinsic!\n";
 166   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 167     OS << "  ";
 168     if (Ints[i].isOverloaded)
 169       OS << "true";
 170     else
 171       OS << "false";
 172     OS << ",\n";
 173   }
 174   OS << "#endif\n\n";
 175 }
 176
 177 static void EmitTypeForValueType(raw_ostream &OS, MVT::SimpleValueType VT) {
 178   if (EVT(VT).isInteger()) {
 179     unsigned BitWidth = EVT(VT).getSizeInBits();
 180     OS << "IntegerType::get(Context, " << BitWidth << ")";
 181   } else if (VT == MVT::Other) {
 182     // MVT::OtherVT is used to mean the empty struct type here.
 183     OS << "StructType::get(Context)";
 184   } else if (VT == MVT::f32) {
 185     OS << "Type::getFloatTy(Context)";
 186   } else if (VT == MVT::f64) {
 187     OS << "Type::getDoubleTy(Context)";
 188   } else if (VT == MVT::f80) {
 189     OS << "Type::getX86_FP80Ty(Context)";
 190   } else if (VT == MVT::f128) {
 191     OS << "Type::getFP128Ty(Context)";
 192   } else if (VT == MVT::ppcf128) {
 193     OS << "Type::getPPC_FP128Ty(Context)";
 194   } else if (VT == MVT::isVoid) {
 195     OS << "Type::getVoidTy(Context)";
 196   } else if (VT == MVT::Metadata) {
 197     OS << "Type::getMetadataTy(Context)";
 198   } else if (VT == MVT::x86mmx) {
 199     OS << "Type::getX86_MMXTy(Context)";
 200   } else {
 201     assert(false && "Unsupported ValueType!");
 202   }
 203 }
 204
 205 static void EmitTypeGenerate(raw_ostream &OS, const Record *ArgType,
 206                              unsigned &ArgNo);
 207
 208 static void EmitTypeGenerate(raw_ostream &OS,
 209                              const std::vector<Record*> &ArgTypes,
 210                              unsigned &ArgNo) {
 211   if (ArgTypes.empty())
 212     return EmitTypeForValueType(OS, MVT::isVoid);
 213
 214   if (ArgTypes.size() == 1)
 215     return EmitTypeGenerate(OS, ArgTypes.front(), ArgNo);
 216
 217   OS << "StructType::get(Context, ";
 218
 219   for (std::vector<Record*>::const_iterator
 220          I = ArgTypes.begin(), E = ArgTypes.end(); I != E; ++I) {
 221     EmitTypeGenerate(OS, *I, ArgNo);
 222     OS << ", ";
 223   }
 224
 225   OS << " NULL)";
 226 }
 227
 228 static void EmitTypeGenerate(raw_ostream &OS, const Record *ArgType,
 229                              unsigned &ArgNo) {
 230   MVT::SimpleValueType VT = getValueType(ArgType->getValueAsDef("VT"));
 231
 232   if (ArgType->isSubClassOf("LLVMMatchType")) {
 233     unsigned Number = ArgType->getValueAsInt("Number");
 234     assert(Number < ArgNo && "Invalid matching number!");
 235     if (ArgType->isSubClassOf("LLVMExtendedElementVectorType"))
 236       OS << "VectorType::getExtendedElementVectorType"
 237          << "(dyn_cast<VectorType>(Tys[" << Number << "]))";
 238     else if (ArgType->isSubClassOf("LLVMTruncatedElementVectorType"))
 239       OS << "VectorType::getTruncatedElementVectorType"
 240          << "(dyn_cast<VectorType>(Tys[" << Number << "]))";
 241     else
 242       OS << "Tys[" << Number << "]";
 243   } else if (VT == MVT::iAny || VT == MVT::fAny || VT == MVT::vAny) {
 244     // NOTE: The ArgNo variable here is not the absolute argument number, it is
 245     // the index of the "arbitrary" type in the Tys array passed to the
 246     // Intrinsic::getDeclaration function. Consequently, we only want to
 247     // increment it when we actually hit an overloaded type. Getting this wrong
 248     // leads to very subtle bugs!
 249     OS << "Tys[" << ArgNo++ << "]";
 250   } else if (EVT(VT).isVector()) {
 251     EVT VVT = VT;
 252     OS << "VectorType::get(";
 253     EmitTypeForValueType(OS, VVT.getVectorElementType().getSimpleVT().SimpleTy);
 254     OS << ", " << VVT.getVectorNumElements() << ")";
 255   } else if (VT == MVT::iPTR) {
 256     OS << "PointerType::getUnqual(";
 257     EmitTypeGenerate(OS, ArgType->getValueAsDef("ElTy"), ArgNo);
 258     OS << ")";
 259   } else if (VT == MVT::iPTRAny) {
 260     // Make sure the user has passed us an argument type to overload. If not,
 261     // treat it as an ordinary (not overloaded) intrinsic.
 262     OS << "(" << ArgNo << " < numTys) ? Tys[" << ArgNo
 263     << "] : PointerType::getUnqual(";
 264     EmitTypeGenerate(OS, ArgType->getValueAsDef("ElTy"), ArgNo);
 265     OS << ")";
 266     ++ArgNo;
 267   } else if (VT == MVT::isVoid) {
 268     if (ArgNo == 0)
 269       OS << "Type::getVoidTy(Context)";
 270     else
 271       // MVT::isVoid is used to mean varargs here.
 272       OS << "...";
 273   } else {
 274     EmitTypeForValueType(OS, VT);
 275   }
 276 }
 277
 278 /// RecordListComparator - Provide a deterministic comparator for lists of
 279 /// records.
 280 namespace {
 281   typedef std::pair<std::vector<Record*>, std::vector<Record*> > RecPair;
 282   struct RecordListComparator {
 283     bool operator()(const RecPair &LHS,
 284                     const RecPair &RHS) const {
 285       unsigned i = 0;
 286       const std::vector<Record*> *LHSVec = &LHS.first;
 287       const std::vector<Record*> *RHSVec = &RHS.first;
 288       unsigned RHSSize = RHSVec->size();
 289       unsigned LHSSize = LHSVec->size();
 290
 291       for (; i != LHSSize; ++i) {
 292         if (i == RHSSize) return false;  // RHS is shorter than LHS.
 293         if ((*LHSVec)[i] != (*RHSVec)[i])
 294           return (*LHSVec)[i]->getName() < (*RHSVec)[i]->getName();
 295       }
 296
 297       if (i != RHSSize) return true;
 298
 299       i = 0;
 300       LHSVec = &LHS.second;
 301       RHSVec = &RHS.second;
 302       RHSSize = RHSVec->size();
 303       LHSSize = LHSVec->size();
 304
 305       for (i = 0; i != LHSSize; ++i) {
 306         if (i == RHSSize) return false;  // RHS is shorter than LHS.
 307         if ((*LHSVec)[i] != (*RHSVec)[i])
 308           return (*LHSVec)[i]->getName() < (*RHSVec)[i]->getName();
 309       }
 310
 311       return i != RHSSize;
 312     }
 313   };
 314 }
 315
 316 void IntrinsicEmitter::EmitVerifier(const std::vector<CodeGenIntrinsic> &Ints,
 317                                     raw_ostream &OS) {
 318   OS << "// Verifier::visitIntrinsicFunctionCall code.\n";
 319   OS << "#ifdef GET_INTRINSIC_VERIFIER\n";
 320   OS << "  switch (ID) {\n";
 321   OS << "  default: assert(0 && \"Invalid intrinsic!\");\n";
 322
 323   // This checking can emit a lot of very common code.  To reduce the amount of
 324   // code that we emit, batch up cases that have identical types.  This avoids
 325   // problems where GCC can run out of memory compiling Verifier.cpp.
 326   typedef std::map<RecPair, std::vector<unsigned>, RecordListComparator> MapTy;
 327   MapTy UniqueArgInfos;
 328
 329   // Compute the unique argument type info.
 330   for (unsigned i = 0, e = Ints.size(); i != e; ++i)
 331     UniqueArgInfos[make_pair(Ints[i].IS.RetTypeDefs,
 332                              Ints[i].IS.ParamTypeDefs)].push_back(i);
 333
 334   // Loop through the array, emitting one comparison for each batch.
 335   for (MapTy::iterator I = UniqueArgInfos.begin(),
 336        E = UniqueArgInfos.end(); I != E; ++I) {
 337     for (unsigned i = 0, e = I->second.size(); i != e; ++i)
 338       OS << "  case Intrinsic::" << Ints[I->second[i]].EnumName << ":\t\t// "
 339          << Ints[I->second[i]].Name << "\n";
 340
 341     const RecPair &ArgTypes = I->first;
 342     const std::vector<Record*> &RetTys = ArgTypes.first;
 343     const std::vector<Record*> &ParamTys = ArgTypes.second;
 344     std::vector<unsigned> OverloadedTypeIndices;
 345
 346     OS << "    VerifyIntrinsicPrototype(ID, IF, " << RetTys.size() << ", "
 347        << ParamTys.size();
 348
 349     // Emit return types.
 350     for (unsigned j = 0, je = RetTys.size(); j != je; ++j) {
 351       Record *ArgType = RetTys[j];
 352       OS << ", ";
 353
 354       if (ArgType->isSubClassOf("LLVMMatchType")) {
 355         unsigned Number = ArgType->getValueAsInt("Number");
 356         assert(Number < OverloadedTypeIndices.size() &&
 357                "Invalid matching number!");
 358         Number = OverloadedTypeIndices[Number];
 359         if (ArgType->isSubClassOf("LLVMExtendedElementVectorType"))
 360           OS << "~(ExtendedElementVectorType | " << Number << ")";
 361         else if (ArgType->isSubClassOf("LLVMTruncatedElementVectorType"))
 362           OS << "~(TruncatedElementVectorType | " << Number << ")";
 363         else
 364           OS << "~" << Number;
 365       } else {
 366         MVT::SimpleValueType VT = getValueType(ArgType->getValueAsDef("VT"));
 367         OS << getEnumName(VT);
 368
 369         if (EVT(VT).isOverloaded())
 370           OverloadedTypeIndices.push_back(j);
 371
 372         if (VT == MVT::isVoid && j != 0 && j != je - 1)
 373           throw "Var arg type not last argument";
 374       }
 375     }
 376
 377     // Emit the parameter types.
 378     for (unsigned j = 0, je = ParamTys.size(); j != je; ++j) {
 379       Record *ArgType = ParamTys[j];
 380       OS << ", ";
 381
 382       if (ArgType->isSubClassOf("LLVMMatchType")) {
 383         unsigned Number = ArgType->getValueAsInt("Number");
 384         assert(Number < OverloadedTypeIndices.size() &&
 385                "Invalid matching number!");
 386         Number = OverloadedTypeIndices[Number];
 387         if (ArgType->isSubClassOf("LLVMExtendedElementVectorType"))
 388           OS << "~(ExtendedElementVectorType | " << Number << ")";
 389         else if (ArgType->isSubClassOf("LLVMTruncatedElementVectorType"))
 390           OS << "~(TruncatedElementVectorType | " << Number << ")";
 391         else
 392           OS << "~" << Number;
 393       } else {
 394         MVT::SimpleValueType VT = getValueType(ArgType->getValueAsDef("VT"));
 395         OS << getEnumName(VT);
 396
 397         if (EVT(VT).isOverloaded())
 398           OverloadedTypeIndices.push_back(j + RetTys.size());
 399
 400         if (VT == MVT::isVoid && j != 0 && j != je - 1)
 401           throw "Var arg type not last argument";
 402       }
 403     }
 404
 405     OS << ");\n";
 406     OS << "    break;\n";
 407   }
 408   OS << "  }\n";
 409   OS << "#endif\n\n";
 410 }
 411
 412 void IntrinsicEmitter::EmitGenerator(const std::vector<CodeGenIntrinsic> &Ints,
 413                                      raw_ostream &OS) {
 414   OS << "// Code for generating Intrinsic function declarations.\n";
 415   OS << "#ifdef GET_INTRINSIC_GENERATOR\n";
 416   OS << "  switch (id) {\n";
 417   OS << "  default: assert(0 && \"Invalid intrinsic!\");\n";
 418
 419   // Similar to GET_INTRINSIC_VERIFIER, batch up cases that have identical
 420   // types.
 421   typedef std::map<RecPair, std::vector<unsigned>, RecordListComparator> MapTy;
 422   MapTy UniqueArgInfos;
 423
 424   // Compute the unique argument type info.
 425   for (unsigned i = 0, e = Ints.size(); i != e; ++i)
 426     UniqueArgInfos[make_pair(Ints[i].IS.RetTypeDefs,
 427                              Ints[i].IS.ParamTypeDefs)].push_back(i);
 428
 429   // Loop through the array, emitting one generator for each batch.
 430   std::string IntrinsicStr = TargetPrefix + "Intrinsic::";
 431
 432   for (MapTy::iterator I = UniqueArgInfos.begin(),
 433        E = UniqueArgInfos.end(); I != E; ++I) {
 434     for (unsigned i = 0, e = I->second.size(); i != e; ++i)
 435       OS << "  case " << IntrinsicStr << Ints[I->second[i]].EnumName
 436          << ":\t\t// " << Ints[I->second[i]].Name << "\n";
 437
 438     const RecPair &ArgTypes = I->first;
 439     const std::vector<Record*> &RetTys = ArgTypes.first;
 440     const std::vector<Record*> &ParamTys = ArgTypes.second;
 441
 442     unsigned N = ParamTys.size();
 443
 444     if (N > 1 &&
 445         getValueType(ParamTys[N - 1]->getValueAsDef("VT")) == MVT::isVoid) {
 446       OS << "    IsVarArg = true;\n";
 447       --N;
 448     }
 449
 450     unsigned ArgNo = 0;
 451     OS << "    ResultTy = ";
 452     EmitTypeGenerate(OS, RetTys, ArgNo);
 453     OS << ";\n";
 454
 455     for (unsigned j = 0; j != N; ++j) {
 456       OS << "    ArgTys.push_back(";
 457       EmitTypeGenerate(OS, ParamTys[j], ArgNo);
 458       OS << ");\n";
 459     }
 460
 461     OS << "    break;\n";
 462   }
 463
 464   OS << "  }\n";
 465   OS << "#endif\n\n";
 466 }
 467
 468 /// EmitAttributes - This emits the Intrinsic::getAttributes method.
 469 void IntrinsicEmitter::
 470 EmitAttributes(const std::vector<CodeGenIntrinsic> &Ints, raw_ostream &OS) {
 471   OS << "// Add parameter attributes that are not common to all intrinsics.\n";
 472   OS << "#ifdef GET_INTRINSIC_ATTRIBUTES\n";
 473   if (TargetOnly)
 474     OS << "static AttrListPtr getAttributes(" << TargetPrefix
 475        << "Intrinsic::ID id) {";
 476   else
 477     OS << "AttrListPtr Intrinsic::getAttributes(ID id) {";
 478   OS << "  // No intrinsic can throw exceptions.\n";
 479   OS << "  Attributes Attr = Attribute::NoUnwind;\n";
 480   OS << "  switch (id) {\n";
 481   OS << "  default: break;\n";
 482   unsigned MaxArgAttrs = 0;
 483   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 484     MaxArgAttrs =
 485       std::max(MaxArgAttrs, unsigned(Ints[i].ArgumentAttributes.size()));
 486     switch (Ints[i].ModRef) {
 487     default: break;
 488     case CodeGenIntrinsic::NoMem:
 489       OS << "  case " << TargetPrefix << "Intrinsic::" << Ints[i].EnumName
 490          << ":\n";
 491       break;
 492     }
 493   }
 494   OS << "    Attr |= Attribute::ReadNone; // These do not access memory.\n";
 495   OS << "    break;\n";
 496   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 497     switch (Ints[i].ModRef) {
 498     default: break;
 499     case CodeGenIntrinsic::ReadArgMem:
 500     case CodeGenIntrinsic::ReadMem:
 501       OS << "  case " << TargetPrefix << "Intrinsic::" << Ints[i].EnumName
 502          << ":\n";
 503       break;
 504     }
 505   }
 506   OS << "    Attr |= Attribute::ReadOnly; // These do not write memory.\n";
 507   OS << "    break;\n";
 508   OS << "  }\n";
 509   OS << "  AttributeWithIndex AWI[" << MaxArgAttrs+1 << "];\n";
 510   OS << "  unsigned NumAttrs = 0;\n";
 511   OS << "  switch (id) {\n";
 512   OS << "  default: break;\n";
 513
 514   // Add argument attributes for any intrinsics that have them.
 515   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 516     if (Ints[i].ArgumentAttributes.empty()) continue;
 517
 518     OS << "  case " << TargetPrefix << "Intrinsic::" << Ints[i].EnumName
 519        << ":\n";
 520
 521     std::vector<std::pair<unsigned, CodeGenIntrinsic::ArgAttribute> > ArgAttrs =
 522       Ints[i].ArgumentAttributes;
 523     // Sort by argument index.
 524     std::sort(ArgAttrs.begin(), ArgAttrs.end());
 525
 526     unsigned NumArgsWithAttrs = 0;
 527
 528     while (!ArgAttrs.empty()) {
 529       unsigned ArgNo = ArgAttrs[0].first;
 530
 531       OS << "    AWI[" << NumArgsWithAttrs++ << "] = AttributeWithIndex::get("
 532          << ArgNo+1 << ", 0";
 533
 534       while (!ArgAttrs.empty() && ArgAttrs[0].first == ArgNo) {
 535         switch (ArgAttrs[0].second) {
 536         default: assert(0 && "Unknown arg attribute");
 537         case CodeGenIntrinsic::NoCapture:
 538           OS << "|Attribute::NoCapture";
 539           break;
 540         }
 541         ArgAttrs.erase(ArgAttrs.begin());
 542       }
 543       OS << ");\n";
 544     }
 545
 546     OS << "    NumAttrs = " << NumArgsWithAttrs << ";\n";
 547     OS << "    break;\n";
 548   }
 549
 550   OS << "  }\n";
 551   OS << "  AWI[NumAttrs] = AttributeWithIndex::get(~0, Attr);\n";
 552   OS << "  return AttrListPtr::get(AWI, NumAttrs+1);\n";
 553   OS << "}\n";
 554   OS << "#endif // GET_INTRINSIC_ATTRIBUTES\n\n";
 555 }
 556
 557 /// EmitModRefBehavior - Determine intrinsic alias analysis mod/ref behavior.
 558 void IntrinsicEmitter::
 559 EmitModRefBehavior(const std::vector<CodeGenIntrinsic> &Ints, raw_ostream &OS){
 560   OS << "// Determine intrinsic alias analysis mod/ref behavior.\n";
 561   OS << "#ifdef GET_INTRINSIC_MODREF_BEHAVIOR\n";
 562   OS << "switch (iid) {\n";
 563   OS << "default:\n    return UnknownModRefBehavior;\n";
 564   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 565     if (Ints[i].ModRef == CodeGenIntrinsic::ReadWriteMem)
 566       continue;
 567     OS << "case " << TargetPrefix << "Intrinsic::" << Ints[i].EnumName
 568       << ":\n";
 569     switch (Ints[i].ModRef) {
 570     default:
 571       assert(false && "Unknown Mod/Ref type!");
 572     case CodeGenIntrinsic::NoMem:
 573       OS << "  return DoesNotAccessMemory;\n";
 574       break;
 575     case CodeGenIntrinsic::ReadArgMem:
 576       OS << "  return OnlyReadsArgumentPointees;\n";
 577       break;
 578     case CodeGenIntrinsic::ReadMem:
 579       OS << "  return OnlyReadsMemory;\n";
 580       break;
 581     case CodeGenIntrinsic::ReadWriteArgMem:
 582       OS << "  return OnlyAccessesArgumentPointees;\n";
 583       break;
 584     }
 585   }
 586   OS << "}\n";
 587   OS << "#endif // GET_INTRINSIC_MODREF_BEHAVIOR\n\n";
 588 }
 589
 590 void IntrinsicEmitter::
 591 EmitGCCBuiltinList(const std::vector<CodeGenIntrinsic> &Ints, raw_ostream &OS){
 592   OS << "// Get the GCC builtin that corresponds to an LLVM intrinsic.\n";
 593   OS << "#ifdef GET_GCC_BUILTIN_NAME\n";
 594   OS << "  switch (F->getIntrinsicID()) {\n";
 595   OS << "  default: BuiltinName = \"\"; break;\n";
 596   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 597     if (!Ints[i].GCCBuiltinName.empty()) {
 598       OS << "  case Intrinsic::" << Ints[i].EnumName << ": BuiltinName = \""
 599          << Ints[i].GCCBuiltinName << "\"; break;\n";
 600     }
 601   }
 602   OS << "  }\n";
 603   OS << "#endif\n\n";
 604 }
 605
 606 /// EmitTargetBuiltins - All of the builtins in the specified map are for the
 607 /// same target, and we already checked it.
 608 static void EmitTargetBuiltins(const std::map<std::string, std::string> &BIM,
 609                                const std::string &TargetPrefix,
 610                                raw_ostream &OS) {
 611
 612   std::vector<StringMatcher::StringPair> Results;
 613
 614   for (std::map<std::string, std::string>::const_iterator I = BIM.begin(),
 615        E = BIM.end(); I != E; ++I) {
 616     std::string ResultCode =
 617     "return " + TargetPrefix + "Intrinsic::" + I->second + ";";
 618     Results.push_back(StringMatcher::StringPair(I->first, ResultCode));
 619   }
 620
 621   StringMatcher("BuiltinName", Results, OS).Emit();
 622 }
 623
 624
 625 void IntrinsicEmitter::
 626 EmitIntrinsicToGCCBuiltinMap(const std::vector<CodeGenIntrinsic> &Ints,
 627                              raw_ostream &OS) {
 628   typedef std::map<std::string, std::map<std::string, std::string> > BIMTy;
 629   BIMTy BuiltinMap;
 630   for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
 631     if (!Ints[i].GCCBuiltinName.empty()) {
 632       // Get the map for this target prefix.
 633       std::map<std::string, std::string> &BIM =BuiltinMap[Ints[i].TargetPrefix];
 634
 635       if (!BIM.insert(std::make_pair(Ints[i].GCCBuiltinName,
 636                                      Ints[i].EnumName)).second)
 637         throw "Intrinsic '" + Ints[i].TheDef->getName() +
 638               "': duplicate GCC builtin name!";
 639     }
 640   }
 641
 642   OS << "// Get the LLVM intrinsic that corresponds to a GCC builtin.\n";
 643   OS << "// This is used by the C front-end.  The GCC builtin name is passed\n";
 644   OS << "// in as BuiltinName, and a target prefix (e.g. 'ppc') is passed\n";
 645   OS << "// in as TargetPrefix.  The result is assigned to 'IntrinsicID'.\n";
 646   OS << "#ifdef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN\n";
 647
 648   if (TargetOnly) {
 649     OS << "static " << TargetPrefix << "Intrinsic::ID "
 650        << "getIntrinsicForGCCBuiltin(const char "
 651        << "*TargetPrefixStr, const char *BuiltinNameStr) {\n";
 652   } else {
 653     OS << "Intrinsic::ID Intrinsic::getIntrinsicForGCCBuiltin(const char "
 654        << "*TargetPrefixStr, const char *BuiltinNameStr) {\n";
 655   }
 656
 657   OS << "  StringRef BuiltinName(BuiltinNameStr);\n";
 658   OS << "  StringRef TargetPrefix(TargetPrefixStr);\n\n";
 659
 660   // Note: this could emit significantly better code if we cared.
 661   for (BIMTy::iterator I = BuiltinMap.begin(), E = BuiltinMap.end();I != E;++I){
 662     OS << "  ";
 663     if (!I->first.empty())
 664       OS << "if (TargetPrefix == \"" << I->first << "\") ";
 665     else
 666       OS << "/* Target Independent Builtins */ ";
 667     OS << "{\n";
 668
 669     // Emit the comparisons for this target prefix.
 670     EmitTargetBuiltins(I->second, TargetPrefix, OS);
 671     OS << "  }\n";
 672   }
 673   OS << "  return ";
 674   if (!TargetPrefix.empty())
 675     OS << "(" << TargetPrefix << "Intrinsic::ID)";
 676   OS << "Intrinsic::not_intrinsic;\n";
 677   OS << "}\n";
 678   OS << "#endif\n\n";
 679 }