aboutsummaryrefslogtreecommitdiffstats
path: root/utils/TableGen/ClangOpenCLBuiltinEmitter.cpp
blob: c8975d7bf615dbc7ed2423efda229577f01d1c9c (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
//===- ClangOpenCLBuiltinEmitter.cpp - Generate Clang OpenCL Builtin handling
//
//                     The LLVM Compiler Infrastructure
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This tablegen backend emits code for checking whether a function is an
// OpenCL builtin function. If so, all overloads of this function are
// added to the LookupResult. The generated include file is used by
// SemaLookup.cpp
//
// For a successful lookup of e.g. the "cos" builtin, isOpenCLBuiltin("cos")
// returns a pair <Index, Len>.
// BuiltinTable[Index] to BuiltinTable[Index + Len] contains the pairs
// <SigIndex, SigLen> of the overloads of "cos".
// SignatureTable[SigIndex] to SignatureTable[SigIndex + SigLen] contains
// one of the signatures of "cos". The SignatureTable entry can be
// referenced by other functions, e.g. "sin", to exploit the fact that
// many OpenCL builtins share the same signature.
//
// The file generated by this TableGen emitter contains the following:
//
//  * Structs and enums to represent types and function signatures.
//
//  * OpenCLTypeStruct TypeTable[]
//    Type information for return types and arguments.
//
//  * unsigned SignatureTable[]
//    A list of types representing function signatures.  Each entry is an index
//    into the above TypeTable.  Multiple entries following each other form a
//    signature, where the first entry is the return type and subsequent
//    entries are the argument types.
//
//  * OpenCLBuiltinStruct BuiltinTable[]
//    Each entry represents one overload of an OpenCL builtin function and
//    consists of an index into the SignatureTable and the number of arguments.
//
//  * std::pair<unsigned, unsigned> isOpenCLBuiltin(llvm::StringRef Name)
//    Find out whether a string matches an existing OpenCL builtin function
//    name and return an index into BuiltinTable and the number of overloads.
//
//  * void OCL2Qual(ASTContext&, OpenCLTypeStruct, std::vector<QualType>&)
//    Convert an OpenCLTypeStruct type to a list of QualType instances.
//    One OpenCLTypeStruct can represent multiple types, primarily when using
//    GenTypes.
//
//===----------------------------------------------------------------------===//

#include "TableGenBackends.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/TableGen/Error.h"
#include "llvm/TableGen/Record.h"
#include "llvm/TableGen/StringMatcher.h"
#include "llvm/TableGen/TableGenBackend.h"
#include <set>

using namespace llvm;

namespace {
class BuiltinNameEmitter {
public:
  BuiltinNameEmitter(RecordKeeper &Records, raw_ostream &OS)
      : Records(Records), OS(OS) {}

  // Entrypoint to generate the functions and structures for checking
  // whether a function is an OpenCL builtin function.
  void Emit();

private:
  // Contains OpenCL builtin functions and related information, stored as
  // Record instances. They are coming from the associated TableGen file.
  RecordKeeper &Records;

  // The output file.
  raw_ostream &OS;

  // Helper function for BuiltinNameEmitter::EmitDeclarations.  Generate enum
  // definitions in the Output string parameter, and save their Record instances
  // in the List parameter.
  // \param Types (in) List containing the Types to extract.
  // \param TypesSeen (inout) List containing the Types already extracted.
  // \param Output (out) String containing the enums to emit in the output file.
  // \param List (out) List containing the extracted Types, except the Types in
  //        TypesSeen.
  void ExtractEnumTypes(std::vector<Record *> &Types,
                        StringMap<bool> &TypesSeen, std::string &Output,
                        std::vector<const Record *> &List);

  // Emit the enum or struct used in the generated file.
  // Populate the TypeList at the same time.
  void EmitDeclarations();

  // Parse the Records generated by TableGen to populate the SignaturesList,
  // FctOverloadMap and TypeMap.
  void GetOverloads();

  // Emit the TypeTable containing all types used by OpenCL builtins.
  void EmitTypeTable();

  // Emit the SignatureTable. This table contains all the possible signatures.
  // A signature is stored as a list of indexes of the TypeTable.
  // The first index references the return type (mandatory), and the followings
  // reference its arguments.
  // E.g.:
  // 15, 2, 15 can represent a function with the signature:
  // int func(float, int)
  // The "int" type being at the index 15 in the TypeTable.
  void EmitSignatureTable();

  // Emit the BuiltinTable table. This table contains all the overloads of
  // each function, and is a struct OpenCLBuiltinDecl.
  // E.g.:
  // // 891 convert_float2_rtn
  //   { 58, 2, 100, 0 },
  // This means that the signature of this convert_float2_rtn overload has
  // 1 argument (+1 for the return type), stored at index 58 in
  // the SignatureTable.  The last two values represent the minimum (1.0) and
  // maximum (0, meaning no max version) OpenCL version in which this overload
  // is supported.
  void EmitBuiltinTable();

  // Emit a StringMatcher function to check whether a function name is an
  // OpenCL builtin function name.
  void EmitStringMatcher();

  // Emit a function returning the clang QualType instance associated with
  // the TableGen Record Type.
  void EmitQualTypeFinder();

  // Contains a list of the available signatures, without the name of the
  // function. Each pair consists of a signature and a cumulative index.
  // E.g.:  <<float, float>, 0>,
  //        <<float, int, int, 2>>,
  //        <<float>, 5>,
  //        ...
  //        <<double, double>, 35>.
  std::vector<std::pair<std::vector<Record *>, unsigned>> SignaturesList;

  // Map the name of a builtin function to its prototypes (instances of the
  // TableGen "Builtin" class).
  // Each prototype is registered as a pair of:
  //   <pointer to the "Builtin" instance,
  //    cumulative index of the associated signature in the SignaturesList>
  // E.g.:  The function cos: (float cos(float), double cos(double), ...)
  //        <"cos", <<ptrToPrototype0, 5>,
  //                 <ptrToPrototype1, 35>,
  //                 <ptrToPrototype2, 79>>
  // ptrToPrototype1 has the following signature: <double, double>
  MapVector<StringRef, std::vector<std::pair<const Record *, unsigned>>>
      FctOverloadMap;

  // Contains the map of OpenCL types to their index in the TypeTable.
  MapVector<const Record *, unsigned> TypeMap;

  // List of OpenCL type names in the same order as in enum OpenCLTypeID.
  // This list does not contain generic types.
  std::vector<const Record *> TypeList;

  // Same as TypeList, but for generic types only.
  std::vector<const Record *> GenTypeList;
};
} // namespace

void BuiltinNameEmitter::Emit() {
  emitSourceFileHeader("OpenCL Builtin handling", OS);

  OS << "#include \"llvm/ADT/StringRef.h\"\n";
  OS << "using namespace clang;\n\n";

  // Emit enums and structs.
  EmitDeclarations();

  GetOverloads();

  // Emit tables.
  EmitTypeTable();
  EmitSignatureTable();
  EmitBuiltinTable();

  EmitStringMatcher();

  EmitQualTypeFinder();
}

void BuiltinNameEmitter::ExtractEnumTypes(std::vector<Record *> &Types,
                                          StringMap<bool> &TypesSeen,
                                          std::string &Output,
                                          std::vector<const Record *> &List) {
  raw_string_ostream SS(Output);

  for (const auto *T : Types) {
    if (TypesSeen.find(T->getValueAsString("Name")) == TypesSeen.end()) {
      SS << "  OCLT_" + T->getValueAsString("Name") << ",\n";
      // Save the type names in the same order as their enum value. Note that
      // the Record can be a VectorType or something else, only the name is
      // important.
      List.push_back(T);
      TypesSeen.insert(std::make_pair(T->getValueAsString("Name"), true));
    }
  }
  SS.flush();
}

void BuiltinNameEmitter::EmitDeclarations() {
  // Enum of scalar type names (float, int, ...) and generic type sets.
  OS << "enum OpenCLTypeID {\n";

  StringMap<bool> TypesSeen;
  std::string GenTypeEnums;
  std::string TypeEnums;

  // Extract generic types and non-generic types separately, to keep
  // gentypes at the end of the enum which simplifies the special handling
  // for gentypes in SemaLookup.
  std::vector<Record *> GenTypes =
      Records.getAllDerivedDefinitions("GenericType");
  ExtractEnumTypes(GenTypes, TypesSeen, GenTypeEnums, GenTypeList);

  std::vector<Record *> Types = Records.getAllDerivedDefinitions("Type");
  ExtractEnumTypes(Types, TypesSeen, TypeEnums, TypeList);

  OS << TypeEnums;
  OS << GenTypeEnums;
  OS << "};\n";

  // Structure definitions.
  OS << R"(
// Image access qualifier.
enum OpenCLAccessQual : unsigned char {
  OCLAQ_None,
  OCLAQ_ReadOnly,
  OCLAQ_WriteOnly,
  OCLAQ_ReadWrite
};

// Represents a return type or argument type.
struct OpenCLTypeStruct {
  // A type (e.g. float, int, ...).
  const OpenCLTypeID ID;
  // Vector size (if applicable; 0 for scalars and generic types).
  const unsigned VectorWidth;
  // 0 if the type is not a pointer.
  const bool IsPointer;
  // 0 if the type is not const.
  const bool IsConst;
  // 0 if the type is not volatile.
  const bool IsVolatile;
  // Access qualifier.
  const OpenCLAccessQual AccessQualifier;
  // Address space of the pointer (if applicable).
  const LangAS AS;
};

// One overload of an OpenCL builtin function.
struct OpenCLBuiltinStruct {
  // Index of the signature in the OpenCLTypeStruct table.
  const unsigned SigTableIndex;
  // Entries between index SigTableIndex and (SigTableIndex + NumTypes - 1) in
  // the SignatureTable represent the complete signature.  The first type at
  // index SigTableIndex is the return type.
  const unsigned NumTypes;
  // First OpenCL version in which this overload was introduced (e.g. CL20).
  const unsigned short MinVersion;
  // First OpenCL version in which this overload was removed (e.g. CL20).
  const unsigned short MaxVersion;
};

)";
}

// Verify that the combination of GenTypes in a signature is supported.
// To simplify the logic for creating overloads in SemaLookup, only allow
// a signature to contain different GenTypes if these GenTypes represent
// the same number of actual scalar or vector types.
//
// Exit with a fatal error if an unsupported construct is encountered.
static void VerifySignature(const std::vector<Record *> &Signature,
                            const Record *BuiltinRec) {
  unsigned GenTypeVecSizes = 1;
  unsigned GenTypeTypes = 1;

  for (const auto *T : Signature) {
    // Check all GenericType arguments in this signature.
    if (T->isSubClassOf("GenericType")) {
      // Check number of vector sizes.
      unsigned NVecSizes =
          T->getValueAsDef("VectorList")->getValueAsListOfInts("List").size();
      if (NVecSizes != GenTypeVecSizes && NVecSizes != 1) {
        if (GenTypeVecSizes > 1) {
          // We already saw a gentype with a different number of vector sizes.
          PrintFatalError(BuiltinRec->getLoc(),
              "number of vector sizes should be equal or 1 for all gentypes "
              "in a declaration");
        }
        GenTypeVecSizes = NVecSizes;
      }

      // Check number of data types.
      unsigned NTypes =
          T->getValueAsDef("TypeList")->getValueAsListOfDefs("List").size();
      if (NTypes != GenTypeTypes && NTypes != 1) {
        if (GenTypeTypes > 1) {
          // We already saw a gentype with a different number of types.
          PrintFatalError(BuiltinRec->getLoc(),
              "number of types should be equal or 1 for all gentypes "
              "in a declaration");
        }
        GenTypeTypes = NTypes;
      }
    }
  }
}

void BuiltinNameEmitter::GetOverloads() {
  // Populate the TypeMap.
  std::vector<Record *> Types = Records.getAllDerivedDefinitions("Type");
  unsigned I = 0;
  for (const auto &T : Types) {
    TypeMap.insert(std::make_pair(T, I++));
  }

  // Populate the SignaturesList and the FctOverloadMap.
  unsigned CumulativeSignIndex = 0;
  std::vector<Record *> Builtins = Records.getAllDerivedDefinitions("Builtin");
  for (const auto *B : Builtins) {
    StringRef BName = B->getValueAsString("Name");
    if (FctOverloadMap.find(BName) == FctOverloadMap.end()) {
      FctOverloadMap.insert(std::make_pair(
          BName, std::vector<std::pair<const Record *, unsigned>>{}));
    }

    auto Signature = B->getValueAsListOfDefs("Signature");
    // Reuse signatures to avoid unnecessary duplicates.
    auto it =
        std::find_if(SignaturesList.begin(), SignaturesList.end(),
                     [&](const std::pair<std::vector<Record *>, unsigned> &a) {
                       return a.first == Signature;
                     });
    unsigned SignIndex;
    if (it == SignaturesList.end()) {
      VerifySignature(Signature, B);
      SignaturesList.push_back(std::make_pair(Signature, CumulativeSignIndex));
      SignIndex = CumulativeSignIndex;
      CumulativeSignIndex += Signature.size();
    } else {
      SignIndex = it->second;
    }
    FctOverloadMap[BName].push_back(std::make_pair(B, SignIndex));
  }
}

void BuiltinNameEmitter::EmitTypeTable() {
  OS << "static const OpenCLTypeStruct TypeTable[] = {\n";
  for (const auto &T : TypeMap) {
    const char *AccessQual =
        StringSwitch<const char *>(T.first->getValueAsString("AccessQualifier"))
            .Case("RO", "OCLAQ_ReadOnly")
            .Case("WO", "OCLAQ_WriteOnly")
            .Case("RW", "OCLAQ_ReadWrite")
            .Default("OCLAQ_None");

    OS << "  // " << T.second << "\n"
       << "  {OCLT_" << T.first->getValueAsString("Name") << ", "
       << T.first->getValueAsInt("VecWidth") << ", "
       << T.first->getValueAsBit("IsPointer") << ", "
       << T.first->getValueAsBit("IsConst") << ", "
       << T.first->getValueAsBit("IsVolatile") << ", "
       << AccessQual << ", "
       << T.first->getValueAsString("AddrSpace") << "},\n";
  }
  OS << "};\n\n";
}

void BuiltinNameEmitter::EmitSignatureTable() {
  // Store a type (e.g. int, float, int2, ...). The type is stored as an index
  // of a struct OpenCLType table. Multiple entries following each other form a
  // signature.
  OS << "static const unsigned SignatureTable[] = {\n";
  for (const auto &P : SignaturesList) {
    OS << "  // " << P.second << "\n  ";
    for (const Record *R : P.first) {
      OS << TypeMap.find(R)->second << ", ";
    }
    OS << "\n";
  }
  OS << "};\n\n";
}

void BuiltinNameEmitter::EmitBuiltinTable() {
  unsigned Index = 0;

  OS << "static const OpenCLBuiltinStruct BuiltinTable[] = {\n";
  for (const auto &FOM : FctOverloadMap) {

    OS << "  // " << (Index + 1) << ": " << FOM.first << "\n";

    for (const auto &Overload : FOM.second) {
      OS << "  { " << Overload.second << ", "
         << Overload.first->getValueAsListOfDefs("Signature").size() << ", "
         << Overload.first->getValueAsDef("MinVersion")->getValueAsInt("ID")
         << ", "
         << Overload.first->getValueAsDef("MaxVersion")->getValueAsInt("ID")
         << " },\n";
      Index++;
    }
  }
  OS << "};\n\n";
}

void BuiltinNameEmitter::EmitStringMatcher() {
  std::vector<StringMatcher::StringPair> ValidBuiltins;
  unsigned CumulativeIndex = 1;
  for (auto &i : FctOverloadMap) {
    auto &Ov = i.second;
    std::string RetStmt;
    raw_string_ostream SS(RetStmt);
    SS << "return std::make_pair(" << CumulativeIndex << ", " << Ov.size()
       << ");";
    SS.flush();
    CumulativeIndex += Ov.size();

    ValidBuiltins.push_back(StringMatcher::StringPair(i.first, RetStmt));
  }

  OS << R"(
// Find out whether a string matches an existing OpenCL builtin function name.
// Returns: A pair <0, 0> if no name matches.
//          A pair <Index, Len> indexing the BuiltinTable if the name is
//          matching an OpenCL builtin function.
static std::pair<unsigned, unsigned> isOpenCLBuiltin(llvm::StringRef Name) {

)";

  StringMatcher("Name", ValidBuiltins, OS).Emit(0, true);

  OS << "  return std::make_pair(0, 0);\n";
  OS << "} // isOpenCLBuiltin\n";
}

void BuiltinNameEmitter::EmitQualTypeFinder() {
  OS << R"(

// Convert an OpenCLTypeStruct type to a list of QualTypes.
// Generic types represent multiple types and vector sizes, thus a vector
// is returned. The conversion is done in two steps:
// Step 1: A switch statement fills a vector with scalar base types for the
//         Cartesian product of (vector sizes) x (types) for generic types,
//         or a single scalar type for non generic types.
// Step 2: Qualifiers and other type properties such as vector size are
//         applied.
static void OCL2Qual(ASTContext &Context, const OpenCLTypeStruct &Ty,
                     llvm::SmallVectorImpl<QualType> &QT) {
  // Number of scalar types in the GenType.
  unsigned GenTypeNumTypes;
  // Pointer to the list of vector sizes for the GenType.
  llvm::ArrayRef<unsigned> GenVectorSizes;
)";

  // Generate list of vector sizes for each generic type.
  for (const auto *VectList : Records.getAllDerivedDefinitions("IntList")) {
    OS << "  constexpr unsigned List"
       << VectList->getValueAsString("Name") << "[] = {";
    for (const auto V : VectList->getValueAsListOfInts("List")) {
      OS << V << ", ";
    }
    OS << "};\n";
  }

  // Step 1.
  // Start of switch statement over all types.
  OS << "\n  switch (Ty.ID) {\n";

  // Switch cases for image types (Image2d, Image3d, ...)
  std::vector<Record *> ImageTypes =
      Records.getAllDerivedDefinitions("ImageType");

  // Map an image type name to its 3 access-qualified types (RO, WO, RW).
  std::map<StringRef, SmallVector<Record *, 3>> ImageTypesMap;
  for (auto *IT : ImageTypes) {
    auto Entry = ImageTypesMap.find(IT->getValueAsString("Name"));
    if (Entry == ImageTypesMap.end()) {
      SmallVector<Record *, 3> ImageList;
      ImageList.push_back(IT);
      ImageTypesMap.insert(
          std::make_pair(IT->getValueAsString("Name"), ImageList));
    } else {
      Entry->second.push_back(IT);
    }
  }

  // Emit the cases for the image types.  For an image type name, there are 3
  // corresponding QualTypes ("RO", "WO", "RW").  The "AccessQualifier" field
  // tells which one is needed.  Emit a switch statement that puts the
  // corresponding QualType into "QT".
  for (const auto &ITE : ImageTypesMap) {
    OS << "    case OCLT_" << ITE.first.str() << ":\n"
       << "      switch (Ty.AccessQualifier) {\n"
       << "        case OCLAQ_None:\n"
       << "          llvm_unreachable(\"Image without access qualifier\");\n";
    for (const auto &Image : ITE.second) {
      OS << StringSwitch<const char *>(
                Image->getValueAsString("AccessQualifier"))
                .Case("RO", "        case OCLAQ_ReadOnly:\n")
                .Case("WO", "        case OCLAQ_WriteOnly:\n")
                .Case("RW", "        case OCLAQ_ReadWrite:\n")
         << "          QT.push_back(Context."
         << Image->getValueAsDef("QTName")->getValueAsString("Name") << ");\n"
         << "          break;\n";
    }
    OS << "      }\n"
       << "      break;\n";
  }

  // Switch cases for generic types.
  for (const auto *GenType : Records.getAllDerivedDefinitions("GenericType")) {
    OS << "    case OCLT_" << GenType->getValueAsString("Name") << ":\n";
    OS << "      QT.append({";

    // Build the Cartesian product of (vector sizes) x (types).  Only insert
    // the plain scalar types for now; other type information such as vector
    // size and type qualifiers will be added after the switch statement.
    for (unsigned I = 0; I < GenType->getValueAsDef("VectorList")
                                 ->getValueAsListOfInts("List")
                                 .size();
         I++) {
      for (const auto *T :
           GenType->getValueAsDef("TypeList")->getValueAsListOfDefs("List")) {
        OS << "Context."
           << T->getValueAsDef("QTName")->getValueAsString("Name") << ", ";
      }
    }
    OS << "});\n";
    // GenTypeNumTypes is the number of types in the GenType
    // (e.g. float/double/half).
    OS << "      GenTypeNumTypes = "
       << GenType->getValueAsDef("TypeList")->getValueAsListOfDefs("List")
              .size()
       << ";\n";
    // GenVectorSizes is the list of vector sizes for this GenType.
    // QT contains GenTypeNumTypes * #GenVectorSizes elements.
    OS << "      GenVectorSizes = List"
       << GenType->getValueAsDef("VectorList")->getValueAsString("Name")
       << ";\n";
    OS << "      break;\n";
  }

  // Switch cases for non generic, non image types (int, int4, float, ...).
  // Only insert the plain scalar type; vector information and type qualifiers
  // are added in step 2.
  std::vector<Record *> Types = Records.getAllDerivedDefinitions("Type");
  StringMap<bool> TypesSeen;

  for (const auto *T : Types) {
    // Check this is not an image type
    if (ImageTypesMap.find(T->getValueAsString("Name")) != ImageTypesMap.end())
      continue;
    // Check we have not seen this Type
    if (TypesSeen.find(T->getValueAsString("Name")) != TypesSeen.end())
      continue;
    TypesSeen.insert(std::make_pair(T->getValueAsString("Name"), true));

    // Check the Type does not have an "abstract" QualType
    auto QT = T->getValueAsDef("QTName");
    if (QT->getValueAsBit("IsAbstract") == 1)
      continue;
    // Emit the cases for non generic, non image types.
    OS << "    case OCLT_" << T->getValueAsString("Name") << ":\n";
    OS << "      QT.push_back(Context." << QT->getValueAsString("Name")
       << ");\n";
    OS << "      break;\n";
  }

  // End of switch statement.
  OS << "    default:\n"
     << "      llvm_unreachable(\"OpenCL builtin type not handled yet\");\n"
     << "  } // end of switch (Ty.ID)\n\n";

  // Step 2.
  // Add ExtVector types if this was a generic type, as the switch statement
  // above only populated the list with scalar types.  This completes the
  // construction of the Cartesian product of (vector sizes) x (types).
  OS << "  // Construct the different vector types for each generic type.\n";
  OS << "  if (Ty.ID >= " << TypeList.size() << ") {";
  OS << R"(
    for (unsigned I = 0; I < QT.size(); I++) {
      // For scalars, size is 1.
      if (GenVectorSizes[I / GenTypeNumTypes] != 1) {
        QT[I] = Context.getExtVectorType(QT[I],
                          GenVectorSizes[I / GenTypeNumTypes]);
      }
    }
  }
)";

  // Assign the right attributes to the types (e.g. vector size).
  OS << R"(
  // Set vector size for non-generic vector types.
  if (Ty.VectorWidth > 1) {
    for (unsigned Index = 0; Index < QT.size(); Index++) {
      QT[Index] = Context.getExtVectorType(QT[Index], Ty.VectorWidth);
    }
  }

  if (Ty.IsVolatile != 0) {
    for (unsigned Index = 0; Index < QT.size(); Index++) {
      QT[Index] = Context.getVolatileType(QT[Index]);
    }
  }

  if (Ty.IsConst != 0) {
    for (unsigned Index = 0; Index < QT.size(); Index++) {
      QT[Index] = Context.getConstType(QT[Index]);
    }
  }

  // Transform the type to a pointer as the last step, if necessary.
  // Builtin functions only have pointers on [const|volatile], no
  // [const|volatile] pointers, so this is ok to do it as a last step.
  if (Ty.IsPointer != 0) {
    for (unsigned Index = 0; Index < QT.size(); Index++) {
      QT[Index] = Context.getAddrSpaceQualType(QT[Index], Ty.AS);
      QT[Index] = Context.getPointerType(QT[Index]);
    }
  }
)";

  // End of the "OCL2Qual" function.
  OS << "\n} // OCL2Qual\n";
}

void clang::EmitClangOpenCLBuiltins(RecordKeeper &Records, raw_ostream &OS) {
  BuiltinNameEmitter NameChecker(Records, OS);
  NameChecker.Emit();
}