IntrinsicEmitter.cpp revision 235633 
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 "StringMatcher.h"
17#include "llvm/TableGen/Record.h"
18#include "llvm/ADT/StringExtras.h"
19#include <algorithm>
20using namespace llvm;
21
22//===----------------------------------------------------------------------===//
23// IntrinsicEmitter Implementation
24//===----------------------------------------------------------------------===//
25
26void 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 code to translate GCC builtins into LLVM intrinsics.
61  EmitIntrinsicToGCCBuiltinMap(Ints, OS);
62
63  EmitSuffix(OS);
64}
65
66void IntrinsicEmitter::EmitPrefix(raw_ostream &OS) {
67  OS << "// VisualStudio defines setjmp as _setjmp\n"
68        "#if defined(_MSC_VER) && defined(setjmp) && \\\n"
69        "                         !defined(setjmp_undefined_for_msvc)\n"
70        "#  pragma push_macro(\"setjmp\")\n"
71        "#  undef setjmp\n"
72        "#  define setjmp_undefined_for_msvc\n"
73        "#endif\n\n";
74}
75
76void IntrinsicEmitter::EmitSuffix(raw_ostream &OS) {
77  OS << "#if defined(_MSC_VER) && defined(setjmp_undefined_for_msvc)\n"
78        "// let's return it to _setjmp state\n"
79        "#  pragma pop_macro(\"setjmp\")\n"
80        "#  undef setjmp_undefined_for_msvc\n"
81        "#endif\n\n";
82}
83
84void IntrinsicEmitter::EmitEnumInfo(const std::vector<CodeGenIntrinsic> &Ints,
85                                    raw_ostream &OS) {
86  OS << "// Enum values for Intrinsics.h\n";
87  OS << "#ifdef GET_INTRINSIC_ENUM_VALUES\n";
88  for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
89    OS << "    " << Ints[i].EnumName;
90    OS << ((i != e-1) ? ", " : "  ");
91    OS << std::string(40-Ints[i].EnumName.size(), ' ')
92      << "// " << Ints[i].Name << "\n";
93  }
94  OS << "#endif\n\n";
95}
96
97void IntrinsicEmitter::
98EmitFnNameRecognizer(const std::vector<CodeGenIntrinsic> &Ints,
99                     raw_ostream &OS) {
100  // Build a 'first character of function name' -> intrinsic # mapping.
101  std::map<char, std::vector<unsigned> > IntMapping;
102  for (unsigned i = 0, e = Ints.size(); i != e; ++i)
103    IntMapping[Ints[i].Name[5]].push_back(i);
104
105  OS << "// Function name -> enum value recognizer code.\n";
106  OS << "#ifdef GET_FUNCTION_RECOGNIZER\n";
107  OS << "  StringRef NameR(Name+6, Len-6);   // Skip over 'llvm.'\n";
108  OS << "  switch (Name[5]) {                  // Dispatch on first letter.\n";
109  OS << "  default: break;\n";
110  // Emit the intrinsic matching stuff by first letter.
111  for (std::map<char, std::vector<unsigned> >::iterator I = IntMapping.begin(),
112       E = IntMapping.end(); I != E; ++I) {
113    OS << "  case '" << I->first << "':\n";
114    std::vector<unsigned> &IntList = I->second;
115
116    // Emit all the overloaded intrinsics first, build a table of the
117    // non-overloaded ones.
118    std::vector<StringMatcher::StringPair> MatchTable;
119
120    for (unsigned i = 0, e = IntList.size(); i != e; ++i) {
121      unsigned IntNo = IntList[i];
122      std::string Result = "return " + TargetPrefix + "Intrinsic::" +
123        Ints[IntNo].EnumName + ";";
124
125      if (!Ints[IntNo].isOverloaded) {
126        MatchTable.push_back(std::make_pair(Ints[IntNo].Name.substr(6),Result));
127        continue;
128      }
129
130      // For overloaded intrinsics, only the prefix needs to match
131      std::string TheStr = Ints[IntNo].Name.substr(6);
132      TheStr += '.';  // Require "bswap." instead of bswap.
133      OS << "    if (NameR.startswith(\"" << TheStr << "\")) "
134         << Result << '\n';
135    }
136
137    // Emit the matcher logic for the fixed length strings.
138    StringMatcher("NameR", MatchTable, OS).Emit(1);
139    OS << "    break;  // end of '" << I->first << "' case.\n";
140  }
141
142  OS << "  }\n";
143  OS << "#endif\n\n";
144}
145
146void IntrinsicEmitter::
147EmitIntrinsicToNameTable(const std::vector<CodeGenIntrinsic> &Ints,
148                         raw_ostream &OS) {
149  OS << "// Intrinsic ID to name table\n";
150  OS << "#ifdef GET_INTRINSIC_NAME_TABLE\n";
151  OS << "  // Note that entry #0 is the invalid intrinsic!\n";
152  for (unsigned i = 0, e = Ints.size(); i != e; ++i)
153    OS << "  \"" << Ints[i].Name << "\",\n";
154  OS << "#endif\n\n";
155}
156
157void IntrinsicEmitter::
158EmitIntrinsicToOverloadTable(const std::vector<CodeGenIntrinsic> &Ints,
159                         raw_ostream &OS) {
160  OS << "// Intrinsic ID to overload bitset\n";
161  OS << "#ifdef GET_INTRINSIC_OVERLOAD_TABLE\n";
162  OS << "static const uint8_t OTable[] = {\n";
163  OS << "  0";
164  for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
165    // Add one to the index so we emit a null bit for the invalid #0 intrinsic.
166    if ((i+1)%8 == 0)
167      OS << ",\n  0";
168    if (Ints[i].isOverloaded)
169      OS << " | (1<<" << (i+1)%8 << ')';
170  }
171  OS << "\n};\n\n";
172  // OTable contains a true bit at the position if the intrinsic is overloaded.
173  OS << "return (OTable[id/8] & (1 << (id%8))) != 0;\n";
174  OS << "#endif\n\n";
175}
176
177static 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::f16) {
185    OS << "Type::getHalfTy(Context)";
186  } else if (VT == MVT::f32) {
187    OS << "Type::getFloatTy(Context)";
188  } else if (VT == MVT::f64) {
189    OS << "Type::getDoubleTy(Context)";
190  } else if (VT == MVT::f80) {
191    OS << "Type::getX86_FP80Ty(Context)";
192  } else if (VT == MVT::f128) {
193    OS << "Type::getFP128Ty(Context)";
194  } else if (VT == MVT::ppcf128) {
195    OS << "Type::getPPC_FP128Ty(Context)";
196  } else if (VT == MVT::isVoid) {
197    OS << "Type::getVoidTy(Context)";
198  } else if (VT == MVT::Metadata) {
199    OS << "Type::getMetadataTy(Context)";
200  } else if (VT == MVT::x86mmx) {
201    OS << "Type::getX86_MMXTy(Context)";
202  } else {
203    assert(false && "Unsupported ValueType!");
204  }
205}
206
207static void EmitTypeGenerate(raw_ostream &OS, const Record *ArgType,
208                             unsigned &ArgNo);
209
210static void EmitTypeGenerate(raw_ostream &OS,
211                             const std::vector<Record*> &ArgTypes,
212                             unsigned &ArgNo) {
213  if (ArgTypes.empty())
214    return EmitTypeForValueType(OS, MVT::isVoid);
215
216  if (ArgTypes.size() == 1)
217    return EmitTypeGenerate(OS, ArgTypes.front(), ArgNo);
218
219  OS << "StructType::get(";
220
221  for (std::vector<Record*>::const_iterator
222         I = ArgTypes.begin(), E = ArgTypes.end(); I != E; ++I) {
223    EmitTypeGenerate(OS, *I, ArgNo);
224    OS << ", ";
225  }
226
227  OS << " NULL)";
228}
229
230static void EmitTypeGenerate(raw_ostream &OS, const Record *ArgType,
231                             unsigned &ArgNo) {
232  MVT::SimpleValueType VT = getValueType(ArgType->getValueAsDef("VT"));
233
234  if (ArgType->isSubClassOf("LLVMMatchType")) {
235    unsigned Number = ArgType->getValueAsInt("Number");
236    assert(Number < ArgNo && "Invalid matching number!");
237    if (ArgType->isSubClassOf("LLVMExtendedElementVectorType"))
238      OS << "VectorType::getExtendedElementVectorType"
239         << "(dyn_cast<VectorType>(Tys[" << Number << "]))";
240    else if (ArgType->isSubClassOf("LLVMTruncatedElementVectorType"))
241      OS << "VectorType::getTruncatedElementVectorType"
242         << "(dyn_cast<VectorType>(Tys[" << Number << "]))";
243    else
244      OS << "Tys[" << Number << "]";
245  } else if (VT == MVT::iAny || VT == MVT::fAny || VT == MVT::vAny) {
246    // NOTE: The ArgNo variable here is not the absolute argument number, it is
247    // the index of the "arbitrary" type in the Tys array passed to the
248    // Intrinsic::getDeclaration function. Consequently, we only want to
249    // increment it when we actually hit an overloaded type. Getting this wrong
250    // leads to very subtle bugs!
251    OS << "Tys[" << ArgNo++ << "]";
252  } else if (EVT(VT).isVector()) {
253    EVT VVT = VT;
254    OS << "VectorType::get(";
255    EmitTypeForValueType(OS, VVT.getVectorElementType().getSimpleVT().SimpleTy);
256    OS << ", " << VVT.getVectorNumElements() << ")";
257  } else if (VT == MVT::iPTR) {
258    OS << "PointerType::getUnqual(";
259    EmitTypeGenerate(OS, ArgType->getValueAsDef("ElTy"), ArgNo);
260    OS << ")";
261  } else if (VT == MVT::iPTRAny) {
262    // Make sure the user has passed us an argument type to overload. If not,
263    // treat it as an ordinary (not overloaded) intrinsic.
264    OS << "(" << ArgNo << " < Tys.size()) ? Tys[" << ArgNo
265    << "] : PointerType::getUnqual(";
266    EmitTypeGenerate(OS, ArgType->getValueAsDef("ElTy"), ArgNo);
267    OS << ")";
268    ++ArgNo;
269  } else if (VT == MVT::isVoid) {
270    if (ArgNo == 0)
271      OS << "Type::getVoidTy(Context)";
272    else
273      // MVT::isVoid is used to mean varargs here.
274      OS << "...";
275  } else {
276    EmitTypeForValueType(OS, VT);
277  }
278}
279
280/// RecordListComparator - Provide a deterministic comparator for lists of
281/// records.
282namespace {
283  typedef std::pair<std::vector<Record*>, std::vector<Record*> > RecPair;
284  struct RecordListComparator {
285    bool operator()(const RecPair &LHS,
286                    const RecPair &RHS) const {
287      unsigned i = 0;
288      const std::vector<Record*> *LHSVec = &LHS.first;
289      const std::vector<Record*> *RHSVec = &RHS.first;
290      unsigned RHSSize = RHSVec->size();
291      unsigned LHSSize = LHSVec->size();
292
293      for (; i != LHSSize; ++i) {
294        if (i == RHSSize) return false;  // RHS is shorter than LHS.
295        if ((*LHSVec)[i] != (*RHSVec)[i])
296          return (*LHSVec)[i]->getName() < (*RHSVec)[i]->getName();
297      }
298
299      if (i != RHSSize) return true;
300
301      i = 0;
302      LHSVec = &LHS.second;
303      RHSVec = &RHS.second;
304      RHSSize = RHSVec->size();
305      LHSSize = LHSVec->size();
306
307      for (i = 0; i != LHSSize; ++i) {
308        if (i == RHSSize) return false;  // RHS is shorter than LHS.
309        if ((*LHSVec)[i] != (*RHSVec)[i])
310          return (*LHSVec)[i]->getName() < (*RHSVec)[i]->getName();
311      }
312
313      return i != RHSSize;
314    }
315  };
316}
317
318void IntrinsicEmitter::EmitVerifier(const std::vector<CodeGenIntrinsic> &Ints,
319                                    raw_ostream &OS) {
320  OS << "// Verifier::visitIntrinsicFunctionCall code.\n";
321  OS << "#ifdef GET_INTRINSIC_VERIFIER\n";
322  OS << "  switch (ID) {\n";
323  OS << "  default: llvm_unreachable(\"Invalid intrinsic!\");\n";
324
325  // This checking can emit a lot of very common code.  To reduce the amount of
326  // code that we emit, batch up cases that have identical types.  This avoids
327  // problems where GCC can run out of memory compiling Verifier.cpp.
328  typedef std::map<RecPair, std::vector<unsigned>, RecordListComparator> MapTy;
329  MapTy UniqueArgInfos;
330
331  // Compute the unique argument type info.
332  for (unsigned i = 0, e = Ints.size(); i != e; ++i)
333    UniqueArgInfos[make_pair(Ints[i].IS.RetTypeDefs,
334                             Ints[i].IS.ParamTypeDefs)].push_back(i);
335
336  // Loop through the array, emitting one comparison for each batch.
337  for (MapTy::iterator I = UniqueArgInfos.begin(),
338       E = UniqueArgInfos.end(); I != E; ++I) {
339    for (unsigned i = 0, e = I->second.size(); i != e; ++i)
340      OS << "  case Intrinsic::" << Ints[I->second[i]].EnumName << ":\t\t// "
341         << Ints[I->second[i]].Name << "\n";
342
343    const RecPair &ArgTypes = I->first;
344    const std::vector<Record*> &RetTys = ArgTypes.first;
345    const std::vector<Record*> &ParamTys = ArgTypes.second;
346    std::vector<unsigned> OverloadedTypeIndices;
347
348    OS << "    VerifyIntrinsicPrototype(ID, IF, " << RetTys.size() << ", "
349       << ParamTys.size();
350
351    // Emit return types.
352    for (unsigned j = 0, je = RetTys.size(); j != je; ++j) {
353      Record *ArgType = RetTys[j];
354      OS << ", ";
355
356      if (ArgType->isSubClassOf("LLVMMatchType")) {
357        unsigned Number = ArgType->getValueAsInt("Number");
358        assert(Number < OverloadedTypeIndices.size() &&
359               "Invalid matching number!");
360        Number = OverloadedTypeIndices[Number];
361        if (ArgType->isSubClassOf("LLVMExtendedElementVectorType"))
362          OS << "~(ExtendedElementVectorType | " << Number << ")";
363        else if (ArgType->isSubClassOf("LLVMTruncatedElementVectorType"))
364          OS << "~(TruncatedElementVectorType | " << Number << ")";
365        else
366          OS << "~" << Number;
367      } else {
368        MVT::SimpleValueType VT = getValueType(ArgType->getValueAsDef("VT"));
369        OS << getEnumName(VT);
370
371        if (EVT(VT).isOverloaded())
372          OverloadedTypeIndices.push_back(j);
373
374        if (VT == MVT::isVoid && j != 0 && j != je - 1)
375          throw "Var arg type not last argument";
376      }
377    }
378
379    // Emit the parameter types.
380    for (unsigned j = 0, je = ParamTys.size(); j != je; ++j) {
381      Record *ArgType = ParamTys[j];
382      OS << ", ";
383
384      if (ArgType->isSubClassOf("LLVMMatchType")) {
385        unsigned Number = ArgType->getValueAsInt("Number");
386        assert(Number < OverloadedTypeIndices.size() &&
387               "Invalid matching number!");
388        Number = OverloadedTypeIndices[Number];
389        if (ArgType->isSubClassOf("LLVMExtendedElementVectorType"))
390          OS << "~(ExtendedElementVectorType | " << Number << ")";
391        else if (ArgType->isSubClassOf("LLVMTruncatedElementVectorType"))
392          OS << "~(TruncatedElementVectorType | " << Number << ")";
393        else
394          OS << "~" << Number;
395      } else {
396        MVT::SimpleValueType VT = getValueType(ArgType->getValueAsDef("VT"));
397        OS << getEnumName(VT);
398
399        if (EVT(VT).isOverloaded())
400          OverloadedTypeIndices.push_back(j + RetTys.size());
401
402        if (VT == MVT::isVoid && j != 0 && j != je - 1)
403          throw "Var arg type not last argument";
404      }
405    }
406
407    OS << ");\n";
408    OS << "    break;\n";
409  }
410  OS << "  }\n";
411  OS << "#endif\n\n";
412}
413
414void IntrinsicEmitter::EmitGenerator(const std::vector<CodeGenIntrinsic> &Ints,
415                                     raw_ostream &OS) {
416  OS << "// Code for generating Intrinsic function declarations.\n";
417  OS << "#ifdef GET_INTRINSIC_GENERATOR\n";
418  OS << "  switch (id) {\n";
419  OS << "  default: llvm_unreachable(\"Invalid intrinsic!\");\n";
420
421  // Similar to GET_INTRINSIC_VERIFIER, batch up cases that have identical
422  // types.
423  typedef std::map<RecPair, std::vector<unsigned>, RecordListComparator> MapTy;
424  MapTy UniqueArgInfos;
425
426  // Compute the unique argument type info.
427  for (unsigned i = 0, e = Ints.size(); i != e; ++i)
428    UniqueArgInfos[make_pair(Ints[i].IS.RetTypeDefs,
429                             Ints[i].IS.ParamTypeDefs)].push_back(i);
430
431  // Loop through the array, emitting one generator for each batch.
432  std::string IntrinsicStr = TargetPrefix + "Intrinsic::";
433
434  for (MapTy::iterator I = UniqueArgInfos.begin(),
435       E = UniqueArgInfos.end(); I != E; ++I) {
436    for (unsigned i = 0, e = I->second.size(); i != e; ++i)
437      OS << "  case " << IntrinsicStr << Ints[I->second[i]].EnumName
438         << ":\t\t// " << Ints[I->second[i]].Name << "\n";
439
440    const RecPair &ArgTypes = I->first;
441    const std::vector<Record*> &RetTys = ArgTypes.first;
442    const std::vector<Record*> &ParamTys = ArgTypes.second;
443
444    unsigned N = ParamTys.size();
445
446    if (N > 1 &&
447        getValueType(ParamTys[N - 1]->getValueAsDef("VT")) == MVT::isVoid) {
448      OS << "    IsVarArg = true;\n";
449      --N;
450    }
451
452    unsigned ArgNo = 0;
453    OS << "    ResultTy = ";
454    EmitTypeGenerate(OS, RetTys, ArgNo);
455    OS << ";\n";
456
457    for (unsigned j = 0; j != N; ++j) {
458      OS << "    ArgTys.push_back(";
459      EmitTypeGenerate(OS, ParamTys[j], ArgNo);
460      OS << ");\n";
461    }
462
463    OS << "    break;\n";
464  }
465
466  OS << "  }\n";
467  OS << "#endif\n\n";
468}
469
470namespace {
471  enum ModRefKind {
472    MRK_none,
473    MRK_readonly,
474    MRK_readnone
475  };
476
477  ModRefKind getModRefKind(const CodeGenIntrinsic &intrinsic) {
478    switch (intrinsic.ModRef) {
479    case CodeGenIntrinsic::NoMem:
480      return MRK_readnone;
481    case CodeGenIntrinsic::ReadArgMem:
482    case CodeGenIntrinsic::ReadMem:
483      return MRK_readonly;
484    case CodeGenIntrinsic::ReadWriteArgMem:
485    case CodeGenIntrinsic::ReadWriteMem:
486      return MRK_none;
487    }
488    llvm_unreachable("bad mod-ref kind");
489  }
490
491  struct AttributeComparator {
492    bool operator()(const CodeGenIntrinsic *L, const CodeGenIntrinsic *R) const {
493      // Sort throwing intrinsics after non-throwing intrinsics.
494      if (L->canThrow != R->canThrow)
495        return R->canThrow;
496
497      // Try to order by readonly/readnone attribute.
498      ModRefKind LK = getModRefKind(*L);
499      ModRefKind RK = getModRefKind(*R);
500      if (LK != RK) return (LK > RK);
501
502      // Order by argument attributes.
503      // This is reliable because each side is already sorted internally.
504      return (L->ArgumentAttributes < R->ArgumentAttributes);
505    }
506  };
507}
508
509/// EmitAttributes - This emits the Intrinsic::getAttributes method.
510void IntrinsicEmitter::
511EmitAttributes(const std::vector<CodeGenIntrinsic> &Ints, raw_ostream &OS) {
512  OS << "// Add parameter attributes that are not common to all intrinsics.\n";
513  OS << "#ifdef GET_INTRINSIC_ATTRIBUTES\n";
514  if (TargetOnly)
515    OS << "static AttrListPtr getAttributes(" << TargetPrefix
516       << "Intrinsic::ID id) {\n";
517  else
518    OS << "AttrListPtr Intrinsic::getAttributes(ID id) {\n";
519
520  // Compute the maximum number of attribute arguments and the map
521  typedef std::map<const CodeGenIntrinsic*, unsigned,
522                   AttributeComparator> UniqAttrMapTy;
523  UniqAttrMapTy UniqAttributes;
524  unsigned maxArgAttrs = 0;
525  unsigned AttrNum = 0;
526  for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
527    const CodeGenIntrinsic &intrinsic = Ints[i];
528    maxArgAttrs =
529      std::max(maxArgAttrs, unsigned(intrinsic.ArgumentAttributes.size()));
530    unsigned &N = UniqAttributes[&intrinsic];
531    if (N) continue;
532    assert(AttrNum < 256 && "Too many unique attributes for table!");
533    N = ++AttrNum;
534  }
535
536  // Emit an array of AttributeWithIndex.  Most intrinsics will have
537  // at least one entry, for the function itself (index ~1), which is
538  // usually nounwind.
539  OS << "  static const uint8_t IntrinsicsToAttributesMap[] = {\n";
540
541  for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
542    const CodeGenIntrinsic &intrinsic = Ints[i];
543
544    OS << "    " << UniqAttributes[&intrinsic] << ", // "
545       << intrinsic.Name << "\n";
546  }
547  OS << "  };\n\n";
548
549  OS << "  AttributeWithIndex AWI[" << maxArgAttrs+1 << "];\n";
550  OS << "  unsigned NumAttrs = 0;\n";
551  OS << "  if (id != 0) {\n";
552  OS << "    switch(IntrinsicsToAttributesMap[id - ";
553  if (TargetOnly)
554    OS << "Intrinsic::num_intrinsics";
555  else
556    OS << "1";
557  OS << "]) {\n";
558  OS << "    default: llvm_unreachable(\"Invalid attribute number\");\n";
559  for (UniqAttrMapTy::const_iterator I = UniqAttributes.begin(),
560       E = UniqAttributes.end(); I != E; ++I) {
561    OS << "    case " << I->second << ":\n";
562
563    const CodeGenIntrinsic &intrinsic = *(I->first);
564
565    // Keep track of the number of attributes we're writing out.
566    unsigned numAttrs = 0;
567
568    // The argument attributes are alreadys sorted by argument index.
569    for (unsigned ai = 0, ae = intrinsic.ArgumentAttributes.size(); ai != ae;) {
570      unsigned argNo = intrinsic.ArgumentAttributes[ai].first;
571
572      OS << "      AWI[" << numAttrs++ << "] = AttributeWithIndex::get("
573         << argNo+1 << ", ";
574
575      bool moreThanOne = false;
576
577      do {
578        if (moreThanOne) OS << '|';
579
580        switch (intrinsic.ArgumentAttributes[ai].second) {
581        case CodeGenIntrinsic::NoCapture:
582          OS << "Attribute::NoCapture";
583          break;
584        }
585
586        ++ai;
587        moreThanOne = true;
588      } while (ai != ae && intrinsic.ArgumentAttributes[ai].first == argNo);
589
590      OS << ");\n";
591    }
592
593    ModRefKind modRef = getModRefKind(intrinsic);
594
595    if (!intrinsic.canThrow || modRef) {
596      OS << "      AWI[" << numAttrs++ << "] = AttributeWithIndex::get(~0, ";
597      if (!intrinsic.canThrow) {
598        OS << "Attribute::NoUnwind";
599        if (modRef) OS << '|';
600      }
601      switch (modRef) {
602      case MRK_none: break;
603      case MRK_readonly: OS << "Attribute::ReadOnly"; break;
604      case MRK_readnone: OS << "Attribute::ReadNone"; break;
605      }
606      OS << ");\n";
607    }
608
609    if (numAttrs) {
610      OS << "      NumAttrs = " << numAttrs << ";\n";
611      OS << "      break;\n";
612    } else {
613      OS << "      return AttrListPtr();\n";
614    }
615  }
616
617  OS << "    }\n";
618  OS << "  }\n";
619  OS << "  return AttrListPtr::get(AWI, NumAttrs);\n";
620  OS << "}\n";
621  OS << "#endif // GET_INTRINSIC_ATTRIBUTES\n\n";
622}
623
624/// EmitModRefBehavior - Determine intrinsic alias analysis mod/ref behavior.
625void IntrinsicEmitter::
626EmitModRefBehavior(const std::vector<CodeGenIntrinsic> &Ints, raw_ostream &OS){
627  OS << "// Determine intrinsic alias analysis mod/ref behavior.\n"
628     << "#ifdef GET_INTRINSIC_MODREF_BEHAVIOR\n"
629     << "assert(iid <= Intrinsic::" << Ints.back().EnumName << " && "
630     << "\"Unknown intrinsic.\");\n\n";
631
632  OS << "static const uint8_t IntrinsicModRefBehavior[] = {\n"
633     << "  /* invalid */ UnknownModRefBehavior,\n";
634  for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
635    OS << "  /* " << TargetPrefix << Ints[i].EnumName << " */ ";
636    switch (Ints[i].ModRef) {
637    case CodeGenIntrinsic::NoMem:
638      OS << "DoesNotAccessMemory,\n";
639      break;
640    case CodeGenIntrinsic::ReadArgMem:
641      OS << "OnlyReadsArgumentPointees,\n";
642      break;
643    case CodeGenIntrinsic::ReadMem:
644      OS << "OnlyReadsMemory,\n";
645      break;
646    case CodeGenIntrinsic::ReadWriteArgMem:
647      OS << "OnlyAccessesArgumentPointees,\n";
648      break;
649    case CodeGenIntrinsic::ReadWriteMem:
650      OS << "UnknownModRefBehavior,\n";
651      break;
652    }
653  }
654  OS << "};\n\n"
655     << "return static_cast<ModRefBehavior>(IntrinsicModRefBehavior[iid]);\n"
656     << "#endif // GET_INTRINSIC_MODREF_BEHAVIOR\n\n";
657}
658
659/// EmitTargetBuiltins - All of the builtins in the specified map are for the
660/// same target, and we already checked it.
661static void EmitTargetBuiltins(const std::map<std::string, std::string> &BIM,
662                               const std::string &TargetPrefix,
663                               raw_ostream &OS) {
664
665  std::vector<StringMatcher::StringPair> Results;
666
667  for (std::map<std::string, std::string>::const_iterator I = BIM.begin(),
668       E = BIM.end(); I != E; ++I) {
669    std::string ResultCode =
670    "return " + TargetPrefix + "Intrinsic::" + I->second + ";";
671    Results.push_back(StringMatcher::StringPair(I->first, ResultCode));
672  }
673
674  StringMatcher("BuiltinName", Results, OS).Emit();
675}
676
677
678void IntrinsicEmitter::
679EmitIntrinsicToGCCBuiltinMap(const std::vector<CodeGenIntrinsic> &Ints,
680                             raw_ostream &OS) {
681  typedef std::map<std::string, std::map<std::string, std::string> > BIMTy;
682  BIMTy BuiltinMap;
683  for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
684    if (!Ints[i].GCCBuiltinName.empty()) {
685      // Get the map for this target prefix.
686      std::map<std::string, std::string> &BIM =BuiltinMap[Ints[i].TargetPrefix];
687
688      if (!BIM.insert(std::make_pair(Ints[i].GCCBuiltinName,
689                                     Ints[i].EnumName)).second)
690        throw "Intrinsic '" + Ints[i].TheDef->getName() +
691              "': duplicate GCC builtin name!";
692    }
693  }
694
695  OS << "// Get the LLVM intrinsic that corresponds to a GCC builtin.\n";
696  OS << "// This is used by the C front-end.  The GCC builtin name is passed\n";
697  OS << "// in as BuiltinName, and a target prefix (e.g. 'ppc') is passed\n";
698  OS << "// in as TargetPrefix.  The result is assigned to 'IntrinsicID'.\n";
699  OS << "#ifdef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN\n";
700
701  if (TargetOnly) {
702    OS << "static " << TargetPrefix << "Intrinsic::ID "
703       << "getIntrinsicForGCCBuiltin(const char "
704       << "*TargetPrefixStr, const char *BuiltinNameStr) {\n";
705  } else {
706    OS << "Intrinsic::ID Intrinsic::getIntrinsicForGCCBuiltin(const char "
707       << "*TargetPrefixStr, const char *BuiltinNameStr) {\n";
708  }
709
710  OS << "  StringRef BuiltinName(BuiltinNameStr);\n";
711  OS << "  StringRef TargetPrefix(TargetPrefixStr);\n\n";
712
713  // Note: this could emit significantly better code if we cared.
714  for (BIMTy::iterator I = BuiltinMap.begin(), E = BuiltinMap.end();I != E;++I){
715    OS << "  ";
716    if (!I->first.empty())
717      OS << "if (TargetPrefix == \"" << I->first << "\") ";
718    else
719      OS << "/* Target Independent Builtins */ ";
720    OS << "{\n";
721
722    // Emit the comparisons for this target prefix.
723    EmitTargetBuiltins(I->second, TargetPrefix, OS);
724    OS << "  }\n";
725  }
726  OS << "  return ";
727  if (!TargetPrefix.empty())
728    OS << "(" << TargetPrefix << "Intrinsic::ID)";
729  OS << "Intrinsic::not_intrinsic;\n";
730  OS << "}\n";
731  OS << "#endif\n\n";
732}
733