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 "CodeGenIntrinsics.h"
15#include "CodeGenTarget.h"
16#include "SequenceToOffsetTable.h"
17#include "llvm/ADT/StringExtras.h"
18#include "llvm/TableGen/Record.h"
19#include "llvm/TableGen/StringMatcher.h"
20#include "llvm/TableGen/TableGenBackend.h"
21#include <algorithm>
22using namespace llvm;
23
24namespace {
25class IntrinsicEmitter {
26  RecordKeeper &Records;
27  bool TargetOnly;
28  std::string TargetPrefix;
29
30public:
31  IntrinsicEmitter(RecordKeeper &R, bool T)
32    : Records(R), TargetOnly(T) {}
33
34  void run(raw_ostream &OS);
35
36  void EmitPrefix(raw_ostream &OS);
37
38  void EmitEnumInfo(const std::vector<CodeGenIntrinsic> &Ints,
39                    raw_ostream &OS);
40
41  void EmitFnNameRecognizer(const std::vector<CodeGenIntrinsic> &Ints,
42                            raw_ostream &OS);
43  void EmitIntrinsicToNameTable(const std::vector<CodeGenIntrinsic> &Ints,
44                                raw_ostream &OS);
45  void EmitIntrinsicToOverloadTable(const std::vector<CodeGenIntrinsic> &Ints,
46                                    raw_ostream &OS);
47  void EmitVerifier(const std::vector<CodeGenIntrinsic> &Ints,
48                    raw_ostream &OS);
49  void EmitGenerator(const std::vector<CodeGenIntrinsic> &Ints,
50                     raw_ostream &OS);
51  void EmitAttributes(const std::vector<CodeGenIntrinsic> &Ints,
52                      raw_ostream &OS);
53  void EmitModRefBehavior(const std::vector<CodeGenIntrinsic> &Ints,
54                          raw_ostream &OS);
55  void EmitIntrinsicToGCCBuiltinMap(const std::vector<CodeGenIntrinsic> &Ints,
56                                    raw_ostream &OS);
57  void EmitSuffix(raw_ostream &OS);
58};
59} // End anonymous namespace
60
61//===----------------------------------------------------------------------===//
62// IntrinsicEmitter Implementation
63//===----------------------------------------------------------------------===//
64
65void IntrinsicEmitter::run(raw_ostream &OS) {
66  emitSourceFileHeader("Intrinsic Function Source Fragment", OS);
67
68  std::vector<CodeGenIntrinsic> Ints = LoadIntrinsics(Records, TargetOnly);
69
70  if (TargetOnly && !Ints.empty())
71    TargetPrefix = Ints[0].TargetPrefix;
72
73  EmitPrefix(OS);
74
75  // Emit the enum information.
76  EmitEnumInfo(Ints, OS);
77
78  // Emit the intrinsic ID -> name table.
79  EmitIntrinsicToNameTable(Ints, OS);
80
81  // Emit the intrinsic ID -> overload table.
82  EmitIntrinsicToOverloadTable(Ints, OS);
83
84  // Emit the function name recognizer.
85  EmitFnNameRecognizer(Ints, OS);
86
87  // Emit the intrinsic declaration generator.
88  EmitGenerator(Ints, OS);
89
90  // Emit the intrinsic parameter attributes.
91  EmitAttributes(Ints, OS);
92
93  // Emit intrinsic alias analysis mod/ref behavior.
94  EmitModRefBehavior(Ints, OS);
95
96  // Emit code to translate GCC builtins into LLVM intrinsics.
97  EmitIntrinsicToGCCBuiltinMap(Ints, OS);
98
99  EmitSuffix(OS);
100}
101
102void IntrinsicEmitter::EmitPrefix(raw_ostream &OS) {
103  OS << "// VisualStudio defines setjmp as _setjmp\n"
104        "#if defined(_MSC_VER) && defined(setjmp) && \\\n"
105        "                         !defined(setjmp_undefined_for_msvc)\n"
106        "#  pragma push_macro(\"setjmp\")\n"
107        "#  undef setjmp\n"
108        "#  define setjmp_undefined_for_msvc\n"
109        "#endif\n\n";
110}
111
112void IntrinsicEmitter::EmitSuffix(raw_ostream &OS) {
113  OS << "#if defined(_MSC_VER) && defined(setjmp_undefined_for_msvc)\n"
114        "// let's return it to _setjmp state\n"
115        "#  pragma pop_macro(\"setjmp\")\n"
116        "#  undef setjmp_undefined_for_msvc\n"
117        "#endif\n\n";
118}
119
120void IntrinsicEmitter::EmitEnumInfo(const std::vector<CodeGenIntrinsic> &Ints,
121                                    raw_ostream &OS) {
122  OS << "// Enum values for Intrinsics.h\n";
123  OS << "#ifdef GET_INTRINSIC_ENUM_VALUES\n";
124  for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
125    OS << "    " << Ints[i].EnumName;
126    OS << ((i != e-1) ? ", " : "  ");
127    OS << std::string(40-Ints[i].EnumName.size(), ' ')
128      << "// " << Ints[i].Name << "\n";
129  }
130  OS << "#endif\n\n";
131}
132
133void IntrinsicEmitter::
134EmitFnNameRecognizer(const std::vector<CodeGenIntrinsic> &Ints,
135                     raw_ostream &OS) {
136  // Build a 'first character of function name' -> intrinsic # mapping.
137  std::map<char, std::vector<unsigned> > IntMapping;
138  for (unsigned i = 0, e = Ints.size(); i != e; ++i)
139    IntMapping[Ints[i].Name[5]].push_back(i);
140
141  OS << "// Function name -> enum value recognizer code.\n";
142  OS << "#ifdef GET_FUNCTION_RECOGNIZER\n";
143  OS << "  StringRef NameR(Name+6, Len-6);   // Skip over 'llvm.'\n";
144  OS << "  switch (Name[5]) {                  // Dispatch on first letter.\n";
145  OS << "  default: break;\n";
146  // Emit the intrinsic matching stuff by first letter.
147  for (std::map<char, std::vector<unsigned> >::iterator I = IntMapping.begin(),
148       E = IntMapping.end(); I != E; ++I) {
149    OS << "  case '" << I->first << "':\n";
150    std::vector<unsigned> &IntList = I->second;
151
152    // Emit all the overloaded intrinsics first, build a table of the
153    // non-overloaded ones.
154    std::vector<StringMatcher::StringPair> MatchTable;
155
156    for (unsigned i = 0, e = IntList.size(); i != e; ++i) {
157      unsigned IntNo = IntList[i];
158      std::string Result = "return " + TargetPrefix + "Intrinsic::" +
159        Ints[IntNo].EnumName + ";";
160
161      if (!Ints[IntNo].isOverloaded) {
162        MatchTable.push_back(std::make_pair(Ints[IntNo].Name.substr(6),Result));
163        continue;
164      }
165
166      // For overloaded intrinsics, only the prefix needs to match
167      std::string TheStr = Ints[IntNo].Name.substr(6);
168      TheStr += '.';  // Require "bswap." instead of bswap.
169      OS << "    if (NameR.startswith(\"" << TheStr << "\")) "
170         << Result << '\n';
171    }
172
173    // Emit the matcher logic for the fixed length strings.
174    StringMatcher("NameR", MatchTable, OS).Emit(1);
175    OS << "    break;  // end of '" << I->first << "' case.\n";
176  }
177
178  OS << "  }\n";
179  OS << "#endif\n\n";
180}
181
182void IntrinsicEmitter::
183EmitIntrinsicToNameTable(const std::vector<CodeGenIntrinsic> &Ints,
184                         raw_ostream &OS) {
185  OS << "// Intrinsic ID to name table\n";
186  OS << "#ifdef GET_INTRINSIC_NAME_TABLE\n";
187  OS << "  // Note that entry #0 is the invalid intrinsic!\n";
188  for (unsigned i = 0, e = Ints.size(); i != e; ++i)
189    OS << "  \"" << Ints[i].Name << "\",\n";
190  OS << "#endif\n\n";
191}
192
193void IntrinsicEmitter::
194EmitIntrinsicToOverloadTable(const std::vector<CodeGenIntrinsic> &Ints,
195                         raw_ostream &OS) {
196  OS << "// Intrinsic ID to overload bitset\n";
197  OS << "#ifdef GET_INTRINSIC_OVERLOAD_TABLE\n";
198  OS << "static const uint8_t OTable[] = {\n";
199  OS << "  0";
200  for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
201    // Add one to the index so we emit a null bit for the invalid #0 intrinsic.
202    if ((i+1)%8 == 0)
203      OS << ",\n  0";
204    if (Ints[i].isOverloaded)
205      OS << " | (1<<" << (i+1)%8 << ')';
206  }
207  OS << "\n};\n\n";
208  // OTable contains a true bit at the position if the intrinsic is overloaded.
209  OS << "return (OTable[id/8] & (1 << (id%8))) != 0;\n";
210  OS << "#endif\n\n";
211}
212
213
214// NOTE: This must be kept in synch with the copy in lib/VMCore/Function.cpp!
215enum IIT_Info {
216  // Common values should be encoded with 0-15.
217  IIT_Done = 0,
218  IIT_I1   = 1,
219  IIT_I8   = 2,
220  IIT_I16  = 3,
221  IIT_I32  = 4,
222  IIT_I64  = 5,
223  IIT_F32  = 6,
224  IIT_F64  = 7,
225  IIT_V2   = 8,
226  IIT_V4   = 9,
227  IIT_V8   = 10,
228  IIT_V16  = 11,
229  IIT_V32  = 12,
230  IIT_MMX  = 13,
231  IIT_PTR  = 14,
232  IIT_ARG  = 15,
233
234  // Values from 16+ are only encodable with the inefficient encoding.
235  IIT_METADATA = 16,
236  IIT_EMPTYSTRUCT = 17,
237  IIT_STRUCT2 = 18,
238  IIT_STRUCT3 = 19,
239  IIT_STRUCT4 = 20,
240  IIT_STRUCT5 = 21,
241  IIT_EXTEND_VEC_ARG = 22,
242  IIT_TRUNC_VEC_ARG = 23,
243  IIT_ANYPTR = 24
244};
245
246
247static void EncodeFixedValueType(MVT::SimpleValueType VT,
248                                 std::vector<unsigned char> &Sig) {
249  if (EVT(VT).isInteger()) {
250    unsigned BitWidth = EVT(VT).getSizeInBits();
251    switch (BitWidth) {
252    default: throw "unhandled integer type width in intrinsic!";
253    case 1: return Sig.push_back(IIT_I1);
254    case 8: return Sig.push_back(IIT_I8);
255    case 16: return Sig.push_back(IIT_I16);
256    case 32: return Sig.push_back(IIT_I32);
257    case 64: return Sig.push_back(IIT_I64);
258    }
259  }
260
261  switch (VT) {
262  default: throw "unhandled MVT in intrinsic!";
263  case MVT::f32: return Sig.push_back(IIT_F32);
264  case MVT::f64: return Sig.push_back(IIT_F64);
265  case MVT::Metadata: return Sig.push_back(IIT_METADATA);
266  case MVT::x86mmx: return Sig.push_back(IIT_MMX);
267  // MVT::OtherVT is used to mean the empty struct type here.
268  case MVT::Other: return Sig.push_back(IIT_EMPTYSTRUCT);
269  }
270}
271
272#ifdef _MSC_VER
273#pragma optimize("",off) // MSVC 2010 optimizer can't deal with this function.
274#endif
275
276static void EncodeFixedType(Record *R, std::vector<unsigned char> &ArgCodes,
277                            std::vector<unsigned char> &Sig) {
278
279  if (R->isSubClassOf("LLVMMatchType")) {
280    unsigned Number = R->getValueAsInt("Number");
281    assert(Number < ArgCodes.size() && "Invalid matching number!");
282    if (R->isSubClassOf("LLVMExtendedElementVectorType"))
283      Sig.push_back(IIT_EXTEND_VEC_ARG);
284    else if (R->isSubClassOf("LLVMTruncatedElementVectorType"))
285      Sig.push_back(IIT_TRUNC_VEC_ARG);
286    else
287      Sig.push_back(IIT_ARG);
288    return Sig.push_back((Number << 2) | ArgCodes[Number]);
289  }
290
291  MVT::SimpleValueType VT = getValueType(R->getValueAsDef("VT"));
292
293  unsigned Tmp = 0;
294  switch (VT) {
295  default: break;
296  case MVT::iPTRAny: ++Tmp; // FALL THROUGH.
297  case MVT::vAny: ++Tmp; // FALL THROUGH.
298  case MVT::fAny: ++Tmp; // FALL THROUGH.
299  case MVT::iAny: {
300    // If this is an "any" valuetype, then the type is the type of the next
301    // type in the list specified to getIntrinsic().
302    Sig.push_back(IIT_ARG);
303
304    // Figure out what arg # this is consuming, and remember what kind it was.
305    unsigned ArgNo = ArgCodes.size();
306    ArgCodes.push_back(Tmp);
307
308    // Encode what sort of argument it must be in the low 2 bits of the ArgNo.
309    return Sig.push_back((ArgNo << 2) | Tmp);
310  }
311
312  case MVT::iPTR: {
313    unsigned AddrSpace = 0;
314    if (R->isSubClassOf("LLVMQualPointerType")) {
315      AddrSpace = R->getValueAsInt("AddrSpace");
316      assert(AddrSpace < 256 && "Address space exceeds 255");
317    }
318    if (AddrSpace) {
319      Sig.push_back(IIT_ANYPTR);
320      Sig.push_back(AddrSpace);
321    } else {
322      Sig.push_back(IIT_PTR);
323    }
324    return EncodeFixedType(R->getValueAsDef("ElTy"), ArgCodes, Sig);
325  }
326  }
327
328  if (EVT(VT).isVector()) {
329    EVT VVT = VT;
330    switch (VVT.getVectorNumElements()) {
331    default: throw "unhandled vector type width in intrinsic!";
332    case 2: Sig.push_back(IIT_V2); break;
333    case 4: Sig.push_back(IIT_V4); break;
334    case 8: Sig.push_back(IIT_V8); break;
335    case 16: Sig.push_back(IIT_V16); break;
336    case 32: Sig.push_back(IIT_V32); break;
337    }
338
339    return EncodeFixedValueType(VVT.getVectorElementType().
340                                getSimpleVT().SimpleTy, Sig);
341  }
342
343  EncodeFixedValueType(VT, Sig);
344}
345
346#ifdef _MSC_VER
347#pragma optimize("",on)
348#endif
349
350/// ComputeFixedEncoding - If we can encode the type signature for this
351/// intrinsic into 32 bits, return it.  If not, return ~0U.
352static void ComputeFixedEncoding(const CodeGenIntrinsic &Int,
353                                 std::vector<unsigned char> &TypeSig) {
354  std::vector<unsigned char> ArgCodes;
355
356  if (Int.IS.RetVTs.empty())
357    TypeSig.push_back(IIT_Done);
358  else if (Int.IS.RetVTs.size() == 1 &&
359           Int.IS.RetVTs[0] == MVT::isVoid)
360    TypeSig.push_back(IIT_Done);
361  else {
362    switch (Int.IS.RetVTs.size()) {
363      case 1: break;
364      case 2: TypeSig.push_back(IIT_STRUCT2); break;
365      case 3: TypeSig.push_back(IIT_STRUCT3); break;
366      case 4: TypeSig.push_back(IIT_STRUCT4); break;
367      case 5: TypeSig.push_back(IIT_STRUCT5); break;
368      default: assert(0 && "Unhandled case in struct");
369    }
370
371    for (unsigned i = 0, e = Int.IS.RetVTs.size(); i != e; ++i)
372      EncodeFixedType(Int.IS.RetTypeDefs[i], ArgCodes, TypeSig);
373  }
374
375  for (unsigned i = 0, e = Int.IS.ParamTypeDefs.size(); i != e; ++i)
376    EncodeFixedType(Int.IS.ParamTypeDefs[i], ArgCodes, TypeSig);
377}
378
379static void printIITEntry(raw_ostream &OS, unsigned char X) {
380  OS << (unsigned)X;
381}
382
383void IntrinsicEmitter::EmitGenerator(const std::vector<CodeGenIntrinsic> &Ints,
384                                     raw_ostream &OS) {
385  // If we can compute a 32-bit fixed encoding for this intrinsic, do so and
386  // capture it in this vector, otherwise store a ~0U.
387  std::vector<unsigned> FixedEncodings;
388
389  SequenceToOffsetTable<std::vector<unsigned char> > LongEncodingTable;
390
391  std::vector<unsigned char> TypeSig;
392
393  // Compute the unique argument type info.
394  for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
395    // Get the signature for the intrinsic.
396    TypeSig.clear();
397    ComputeFixedEncoding(Ints[i], TypeSig);
398
399    // Check to see if we can encode it into a 32-bit word.  We can only encode
400    // 8 nibbles into a 32-bit word.
401    if (TypeSig.size() <= 8) {
402      bool Failed = false;
403      unsigned Result = 0;
404      for (unsigned i = 0, e = TypeSig.size(); i != e; ++i) {
405        // If we had an unencodable argument, bail out.
406        if (TypeSig[i] > 15) {
407          Failed = true;
408          break;
409        }
410        Result = (Result << 4) | TypeSig[e-i-1];
411      }
412
413      // If this could be encoded into a 31-bit word, return it.
414      if (!Failed && (Result >> 31) == 0) {
415        FixedEncodings.push_back(Result);
416        continue;
417      }
418    }
419
420    // Otherwise, we're going to unique the sequence into the
421    // LongEncodingTable, and use its offset in the 32-bit table instead.
422    LongEncodingTable.add(TypeSig);
423
424    // This is a placehold that we'll replace after the table is laid out.
425    FixedEncodings.push_back(~0U);
426  }
427
428  LongEncodingTable.layout();
429
430  OS << "// Global intrinsic function declaration type table.\n";
431  OS << "#ifdef GET_INTRINSIC_GENERATOR_GLOBAL\n";
432
433  OS << "static const unsigned IIT_Table[] = {\n  ";
434
435  for (unsigned i = 0, e = FixedEncodings.size(); i != e; ++i) {
436    if ((i & 7) == 7)
437      OS << "\n  ";
438
439    // If the entry fit in the table, just emit it.
440    if (FixedEncodings[i] != ~0U) {
441      OS << "0x" << utohexstr(FixedEncodings[i]) << ", ";
442      continue;
443    }
444
445    TypeSig.clear();
446    ComputeFixedEncoding(Ints[i], TypeSig);
447
448
449    // Otherwise, emit the offset into the long encoding table.  We emit it this
450    // way so that it is easier to read the offset in the .def file.
451    OS << "(1U<<31) | " << LongEncodingTable.get(TypeSig) << ", ";
452  }
453
454  OS << "0\n};\n\n";
455
456  // Emit the shared table of register lists.
457  OS << "static const unsigned char IIT_LongEncodingTable[] = {\n";
458  if (!LongEncodingTable.empty())
459    LongEncodingTable.emit(OS, printIITEntry);
460  OS << "  255\n};\n\n";
461
462  OS << "#endif\n\n";  // End of GET_INTRINSIC_GENERATOR_GLOBAL
463}
464
465enum ModRefKind {
466  MRK_none,
467  MRK_readonly,
468  MRK_readnone
469};
470
471static ModRefKind getModRefKind(const CodeGenIntrinsic &intrinsic) {
472  switch (intrinsic.ModRef) {
473  case CodeGenIntrinsic::NoMem:
474    return MRK_readnone;
475  case CodeGenIntrinsic::ReadArgMem:
476  case CodeGenIntrinsic::ReadMem:
477    return MRK_readonly;
478  case CodeGenIntrinsic::ReadWriteArgMem:
479  case CodeGenIntrinsic::ReadWriteMem:
480    return MRK_none;
481  }
482  llvm_unreachable("bad mod-ref kind");
483}
484
485namespace {
486struct AttributeComparator {
487  bool operator()(const CodeGenIntrinsic *L, const CodeGenIntrinsic *R) const {
488    // Sort throwing intrinsics after non-throwing intrinsics.
489    if (L->canThrow != R->canThrow)
490      return R->canThrow;
491
492    if (L->isNoReturn != R->isNoReturn)
493      return R->isNoReturn;
494
495    // Try to order by readonly/readnone attribute.
496    ModRefKind LK = getModRefKind(*L);
497    ModRefKind RK = getModRefKind(*R);
498    if (LK != RK) return (LK > RK);
499
500    // Order by argument attributes.
501    // This is reliable because each side is already sorted internally.
502    return (L->ArgumentAttributes < R->ArgumentAttributes);
503  }
504};
505} // End anonymous namespace
506
507/// EmitAttributes - This emits the Intrinsic::getAttributes method.
508void IntrinsicEmitter::
509EmitAttributes(const std::vector<CodeGenIntrinsic> &Ints, raw_ostream &OS) {
510  OS << "// Add parameter attributes that are not common to all intrinsics.\n";
511  OS << "#ifdef GET_INTRINSIC_ATTRIBUTES\n";
512  if (TargetOnly)
513    OS << "static AttrListPtr getAttributes(" << TargetPrefix
514       << "Intrinsic::ID id) {\n";
515  else
516    OS << "AttrListPtr Intrinsic::getAttributes(ID id) {\n";
517
518  // Compute the maximum number of attribute arguments and the map
519  typedef std::map<const CodeGenIntrinsic*, unsigned,
520                   AttributeComparator> UniqAttrMapTy;
521  UniqAttrMapTy UniqAttributes;
522  unsigned maxArgAttrs = 0;
523  unsigned AttrNum = 0;
524  for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
525    const CodeGenIntrinsic &intrinsic = Ints[i];
526    maxArgAttrs =
527      std::max(maxArgAttrs, unsigned(intrinsic.ArgumentAttributes.size()));
528    unsigned &N = UniqAttributes[&intrinsic];
529    if (N) continue;
530    assert(AttrNum < 256 && "Too many unique attributes for table!");
531    N = ++AttrNum;
532  }
533
534  // Emit an array of AttributeWithIndex.  Most intrinsics will have
535  // at least one entry, for the function itself (index ~1), which is
536  // usually nounwind.
537  OS << "  static const uint8_t IntrinsicsToAttributesMap[] = {\n";
538
539  for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
540    const CodeGenIntrinsic &intrinsic = Ints[i];
541
542    OS << "    " << UniqAttributes[&intrinsic] << ", // "
543       << intrinsic.Name << "\n";
544  }
545  OS << "  };\n\n";
546
547  OS << "  AttributeWithIndex AWI[" << maxArgAttrs+1 << "];\n";
548  OS << "  unsigned NumAttrs = 0;\n";
549  OS << "  if (id != 0) {\n";
550  OS << "    switch(IntrinsicsToAttributesMap[id - ";
551  if (TargetOnly)
552    OS << "Intrinsic::num_intrinsics";
553  else
554    OS << "1";
555  OS << "]) {\n";
556  OS << "    default: llvm_unreachable(\"Invalid attribute number\");\n";
557  for (UniqAttrMapTy::const_iterator I = UniqAttributes.begin(),
558       E = UniqAttributes.end(); I != E; ++I) {
559    OS << "    case " << I->second << ":\n";
560
561    const CodeGenIntrinsic &intrinsic = *(I->first);
562
563    // Keep track of the number of attributes we're writing out.
564    unsigned numAttrs = 0;
565
566    // The argument attributes are alreadys sorted by argument index.
567    for (unsigned ai = 0, ae = intrinsic.ArgumentAttributes.size(); ai != ae;) {
568      unsigned argNo = intrinsic.ArgumentAttributes[ai].first;
569
570      OS << "      AWI[" << numAttrs++ << "] = AttributeWithIndex::get("
571         << argNo+1 << ", ";
572
573      bool moreThanOne = false;
574
575      do {
576        if (moreThanOne) OS << '|';
577
578        switch (intrinsic.ArgumentAttributes[ai].second) {
579        case CodeGenIntrinsic::NoCapture:
580          OS << "Attribute::NoCapture";
581          break;
582        }
583
584        ++ai;
585        moreThanOne = true;
586      } while (ai != ae && intrinsic.ArgumentAttributes[ai].first == argNo);
587
588      OS << ");\n";
589    }
590
591    ModRefKind modRef = getModRefKind(intrinsic);
592
593    if (!intrinsic.canThrow || modRef || intrinsic.isNoReturn) {
594      OS << "      AWI[" << numAttrs++ << "] = AttributeWithIndex::get(~0, ";
595      bool Emitted = false;
596      if (!intrinsic.canThrow) {
597        OS << "Attribute::NoUnwind";
598        Emitted = true;
599      }
600
601      if (intrinsic.isNoReturn) {
602        if (Emitted) OS << '|';
603        OS << "Attribute::NoReturn";
604        Emitted = true;
605      }
606
607      switch (modRef) {
608      case MRK_none: break;
609      case MRK_readonly:
610        if (Emitted) OS << '|';
611        OS << "Attribute::ReadOnly";
612        break;
613      case MRK_readnone:
614        if (Emitted) OS << '|';
615        OS << "Attribute::ReadNone";
616        break;
617      }
618      OS << ");\n";
619    }
620
621    if (numAttrs) {
622      OS << "      NumAttrs = " << numAttrs << ";\n";
623      OS << "      break;\n";
624    } else {
625      OS << "      return AttrListPtr();\n";
626    }
627  }
628
629  OS << "    }\n";
630  OS << "  }\n";
631  OS << "  return AttrListPtr::get(ArrayRef<AttributeWithIndex>(AWI, "
632             "NumAttrs));\n";
633  OS << "}\n";
634  OS << "#endif // GET_INTRINSIC_ATTRIBUTES\n\n";
635}
636
637/// EmitModRefBehavior - Determine intrinsic alias analysis mod/ref behavior.
638void IntrinsicEmitter::
639EmitModRefBehavior(const std::vector<CodeGenIntrinsic> &Ints, raw_ostream &OS){
640  OS << "// Determine intrinsic alias analysis mod/ref behavior.\n"
641     << "#ifdef GET_INTRINSIC_MODREF_BEHAVIOR\n"
642     << "assert(iid <= Intrinsic::" << Ints.back().EnumName << " && "
643     << "\"Unknown intrinsic.\");\n\n";
644
645  OS << "static const uint8_t IntrinsicModRefBehavior[] = {\n"
646     << "  /* invalid */ UnknownModRefBehavior,\n";
647  for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
648    OS << "  /* " << TargetPrefix << Ints[i].EnumName << " */ ";
649    switch (Ints[i].ModRef) {
650    case CodeGenIntrinsic::NoMem:
651      OS << "DoesNotAccessMemory,\n";
652      break;
653    case CodeGenIntrinsic::ReadArgMem:
654      OS << "OnlyReadsArgumentPointees,\n";
655      break;
656    case CodeGenIntrinsic::ReadMem:
657      OS << "OnlyReadsMemory,\n";
658      break;
659    case CodeGenIntrinsic::ReadWriteArgMem:
660      OS << "OnlyAccessesArgumentPointees,\n";
661      break;
662    case CodeGenIntrinsic::ReadWriteMem:
663      OS << "UnknownModRefBehavior,\n";
664      break;
665    }
666  }
667  OS << "};\n\n"
668     << "return static_cast<ModRefBehavior>(IntrinsicModRefBehavior[iid]);\n"
669     << "#endif // GET_INTRINSIC_MODREF_BEHAVIOR\n\n";
670}
671
672/// EmitTargetBuiltins - All of the builtins in the specified map are for the
673/// same target, and we already checked it.
674static void EmitTargetBuiltins(const std::map<std::string, std::string> &BIM,
675                               const std::string &TargetPrefix,
676                               raw_ostream &OS) {
677
678  std::vector<StringMatcher::StringPair> Results;
679
680  for (std::map<std::string, std::string>::const_iterator I = BIM.begin(),
681       E = BIM.end(); I != E; ++I) {
682    std::string ResultCode =
683    "return " + TargetPrefix + "Intrinsic::" + I->second + ";";
684    Results.push_back(StringMatcher::StringPair(I->first, ResultCode));
685  }
686
687  StringMatcher("BuiltinName", Results, OS).Emit();
688}
689
690
691void IntrinsicEmitter::
692EmitIntrinsicToGCCBuiltinMap(const std::vector<CodeGenIntrinsic> &Ints,
693                             raw_ostream &OS) {
694  typedef std::map<std::string, std::map<std::string, std::string> > BIMTy;
695  BIMTy BuiltinMap;
696  for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
697    if (!Ints[i].GCCBuiltinName.empty()) {
698      // Get the map for this target prefix.
699      std::map<std::string, std::string> &BIM =BuiltinMap[Ints[i].TargetPrefix];
700
701      if (!BIM.insert(std::make_pair(Ints[i].GCCBuiltinName,
702                                     Ints[i].EnumName)).second)
703        throw "Intrinsic '" + Ints[i].TheDef->getName() +
704              "': duplicate GCC builtin name!";
705    }
706  }
707
708  OS << "// Get the LLVM intrinsic that corresponds to a GCC builtin.\n";
709  OS << "// This is used by the C front-end.  The GCC builtin name is passed\n";
710  OS << "// in as BuiltinName, and a target prefix (e.g. 'ppc') is passed\n";
711  OS << "// in as TargetPrefix.  The result is assigned to 'IntrinsicID'.\n";
712  OS << "#ifdef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN\n";
713
714  if (TargetOnly) {
715    OS << "static " << TargetPrefix << "Intrinsic::ID "
716       << "getIntrinsicForGCCBuiltin(const char "
717       << "*TargetPrefixStr, const char *BuiltinNameStr) {\n";
718  } else {
719    OS << "Intrinsic::ID Intrinsic::getIntrinsicForGCCBuiltin(const char "
720       << "*TargetPrefixStr, const char *BuiltinNameStr) {\n";
721  }
722
723  OS << "  StringRef BuiltinName(BuiltinNameStr);\n";
724  OS << "  StringRef TargetPrefix(TargetPrefixStr);\n\n";
725
726  // Note: this could emit significantly better code if we cared.
727  for (BIMTy::iterator I = BuiltinMap.begin(), E = BuiltinMap.end();I != E;++I){
728    OS << "  ";
729    if (!I->first.empty())
730      OS << "if (TargetPrefix == \"" << I->first << "\") ";
731    else
732      OS << "/* Target Independent Builtins */ ";
733    OS << "{\n";
734
735    // Emit the comparisons for this target prefix.
736    EmitTargetBuiltins(I->second, TargetPrefix, OS);
737    OS << "  }\n";
738  }
739  OS << "  return ";
740  if (!TargetPrefix.empty())
741    OS << "(" << TargetPrefix << "Intrinsic::ID)";
742  OS << "Intrinsic::not_intrinsic;\n";
743  OS << "}\n";
744  OS << "#endif\n\n";
745}
746
747namespace llvm {
748
749void EmitIntrinsics(RecordKeeper &RK, raw_ostream &OS, bool TargetOnly = false) {
750  IntrinsicEmitter(RK, TargetOnly).run(OS);
751}
752
753} // End llvm namespace
754