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InterpolatingCompilationDatabase.cpp
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1 //===- InterpolatingCompilationDatabase.cpp ---------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // InterpolatingCompilationDatabase wraps another CompilationDatabase and
10 // attempts to heuristically determine appropriate compile commands for files
11 // that are not included, such as headers or newly created files.
12 //
13 // Motivating cases include:
14 // Header files that live next to their implementation files. These typically
15 // share a base filename. (libclang/CXString.h, libclang/CXString.cpp).
16 // Some projects separate headers from includes. Filenames still typically
17 // match, maybe other path segments too. (include/llvm/IR/Use.h, lib/IR/Use.cc).
18 // Matches are sometimes only approximate (Sema.h, SemaDecl.cpp). This goes
19 // for directories too (Support/Unix/Process.inc, lib/Support/Process.cpp).
20 // Even if we can't find a "right" compile command, even a random one from
21 // the project will tend to get important flags like -I and -x right.
22 //
23 // We "borrow" the compile command for the closest available file:
24 // - points are awarded if the filename matches (ignoring extension)
25 // - points are awarded if the directory structure matches
26 // - ties are broken by length of path prefix match
27 //
28 // The compile command is adjusted, replacing the filename and removing output
29 // file arguments. The -x and -std flags may be affected too.
30 //
31 // Source language is a tricky issue: is it OK to use a .c file's command
32 // for building a .cc file? What language is a .h file in?
33 // - We only consider compile commands for c-family languages as candidates.
34 // - For files whose language is implied by the filename (e.g. .m, .hpp)
35 // we prefer candidates from the same language.
36 // If we must cross languages, we drop any -x and -std flags.
37 // - For .h files, candidates from any c-family language are acceptable.
38 // We use the candidate's language, inserting e.g. -x c++-header.
39 //
40 // This class is only useful when wrapping databases that can enumerate all
41 // their compile commands. If getAllFilenames() is empty, no inference occurs.
42 //
43 //===----------------------------------------------------------------------===//
44 
45 #include "clang/Driver/Options.h"
46 #include "clang/Driver/Types.h"
49 #include "llvm/ADT/DenseMap.h"
50 #include "llvm/ADT/Optional.h"
51 #include "llvm/ADT/StringExtras.h"
52 #include "llvm/ADT/StringSwitch.h"
53 #include "llvm/Option/ArgList.h"
54 #include "llvm/Option/OptTable.h"
55 #include "llvm/Support/Debug.h"
56 #include "llvm/Support/Path.h"
57 #include "llvm/Support/StringSaver.h"
58 #include "llvm/Support/raw_ostream.h"
59 #include <memory>
60 
61 namespace clang {
62 namespace tooling {
63 namespace {
64 using namespace llvm;
65 namespace types = clang::driver::types;
66 namespace path = llvm::sys::path;
67 
68 // The length of the prefix these two strings have in common.
69 size_t matchingPrefix(StringRef L, StringRef R) {
70  size_t Limit = std::min(L.size(), R.size());
71  for (size_t I = 0; I < Limit; ++I)
72  if (L[I] != R[I])
73  return I;
74  return Limit;
75 }
76 
77 // A comparator for searching SubstringWithIndexes with std::equal_range etc.
78 // Optionaly prefix semantics: compares equal if the key is a prefix.
79 template <bool Prefix> struct Less {
80  bool operator()(StringRef Key, std::pair<StringRef, size_t> Value) const {
81  StringRef V = Prefix ? Value.first.substr(0, Key.size()) : Value.first;
82  return Key < V;
83  }
84  bool operator()(std::pair<StringRef, size_t> Value, StringRef Key) const {
85  StringRef V = Prefix ? Value.first.substr(0, Key.size()) : Value.first;
86  return V < Key;
87  }
88 };
89 
90 // Infer type from filename. If we might have gotten it wrong, set *Certain.
91 // *.h will be inferred as a C header, but not certain.
92 types::ID guessType(StringRef Filename, bool *Certain = nullptr) {
93  // path::extension is ".cpp", lookupTypeForExtension wants "cpp".
94  auto Lang =
95  types::lookupTypeForExtension(path::extension(Filename).substr(1));
96  if (Certain)
97  *Certain = Lang != types::TY_CHeader && Lang != types::TY_INVALID;
98  return Lang;
99 }
100 
101 // Return Lang as one of the canonical supported types.
102 // e.g. c-header --> c; fortran --> TY_INVALID
103 static types::ID foldType(types::ID Lang) {
104  switch (Lang) {
105  case types::TY_C:
106  case types::TY_CHeader:
107  return types::TY_C;
108  case types::TY_ObjC:
109  case types::TY_ObjCHeader:
110  return types::TY_ObjC;
111  case types::TY_CXX:
112  case types::TY_CXXHeader:
113  return types::TY_CXX;
114  case types::TY_ObjCXX:
115  case types::TY_ObjCXXHeader:
116  return types::TY_ObjCXX;
117  default:
118  return types::TY_INVALID;
119  }
120 }
121 
122 // A CompileCommand that can be applied to another file.
123 struct TransferableCommand {
124  // Flags that should not apply to all files are stripped from CommandLine.
125  CompileCommand Cmd;
126  // Language detected from -x or the filename. Never TY_INVALID.
128  // Standard specified by -std.
130  // Whether the command line is for the cl-compatible driver.
132 
133  TransferableCommand(CompileCommand C)
134  : Cmd(std::move(C)), Type(guessType(Cmd.Filename)),
135  ClangCLMode(checkIsCLMode(Cmd.CommandLine)) {
136  std::vector<std::string> OldArgs = std::move(Cmd.CommandLine);
137  Cmd.CommandLine.clear();
138 
139  // Wrap the old arguments in an InputArgList.
140  llvm::opt::InputArgList ArgList;
141  {
143  for (const std::string &S : OldArgs)
144  TmpArgv.push_back(S.c_str());
145  ArgList = {TmpArgv.begin(), TmpArgv.end()};
146  }
147 
148  // Parse the old args in order to strip out and record unwanted flags.
149  // We parse each argument individually so that we can retain the exact
150  // spelling of each argument; re-rendering is lossy for aliased flags.
151  // E.g. in CL mode, /W4 maps to -Wall.
152  auto OptTable = clang::driver::createDriverOptTable();
153  if (!OldArgs.empty())
154  Cmd.CommandLine.emplace_back(OldArgs.front());
155  for (unsigned Pos = 1; Pos < OldArgs.size();) {
156  using namespace driver::options;
157 
158  const unsigned OldPos = Pos;
159  std::unique_ptr<llvm::opt::Arg> Arg(OptTable->ParseOneArg(
160  ArgList, Pos,
161  /* Include */ClangCLMode ? CoreOption | CLOption : 0,
162  /* Exclude */ClangCLMode ? 0 : CLOption));
163 
164  if (!Arg)
165  continue;
166 
167  const llvm::opt::Option &Opt = Arg->getOption();
168 
169  // Strip input and output files.
170  if (Opt.matches(OPT_INPUT) || Opt.matches(OPT_o) ||
171  (ClangCLMode && (Opt.matches(OPT__SLASH_Fa) ||
172  Opt.matches(OPT__SLASH_Fe) ||
173  Opt.matches(OPT__SLASH_Fi) ||
174  Opt.matches(OPT__SLASH_Fo))))
175  continue;
176 
177  // Strip -x, but record the overridden language.
178  if (const auto GivenType = tryParseTypeArg(*Arg)) {
179  Type = *GivenType;
180  continue;
181  }
182 
183  // Strip -std, but record the value.
184  if (const auto GivenStd = tryParseStdArg(*Arg)) {
185  if (*GivenStd != LangStandard::lang_unspecified)
186  Std = *GivenStd;
187  continue;
188  }
189 
190  Cmd.CommandLine.insert(Cmd.CommandLine.end(),
191  OldArgs.data() + OldPos, OldArgs.data() + Pos);
192  }
193 
194  if (Std != LangStandard::lang_unspecified) // -std take precedence over -x
195  Type = toType(LangStandard::getLangStandardForKind(Std).getLanguage());
196  Type = foldType(*Type);
197  // The contract is to store None instead of TY_INVALID.
198  if (Type == types::TY_INVALID)
199  Type = llvm::None;
200  }
201 
202  // Produce a CompileCommand for \p filename, based on this one.
203  CompileCommand transferTo(StringRef Filename) const {
204  CompileCommand Result = Cmd;
205  Result.Filename = Filename;
206  bool TypeCertain;
207  auto TargetType = guessType(Filename, &TypeCertain);
208  // If the filename doesn't determine the language (.h), transfer with -x.
209  if ((!TargetType || !TypeCertain) && Type) {
210  // Use *Type, or its header variant if the file is a header.
211  // Treat no/invalid extension as header (e.g. C++ standard library).
212  TargetType =
213  (!TargetType || types::onlyPrecompileType(TargetType)) // header?
215  : *Type;
216  if (ClangCLMode) {
217  const StringRef Flag = toCLFlag(TargetType);
218  if (!Flag.empty())
219  Result.CommandLine.push_back(Flag);
220  } else {
221  Result.CommandLine.push_back("-x");
222  Result.CommandLine.push_back(types::getTypeName(TargetType));
223  }
224  }
225  // --std flag may only be transferred if the language is the same.
226  // We may consider "translating" these, e.g. c++11 -> c11.
227  if (Std != LangStandard::lang_unspecified && foldType(TargetType) == Type) {
228  Result.CommandLine.emplace_back((
229  llvm::Twine(ClangCLMode ? "/std:" : "-std=") +
231  }
232  Result.CommandLine.push_back(Filename);
233  Result.Heuristic = "inferred from " + Cmd.Filename;
234  return Result;
235  }
236 
237 private:
238  // Determine whether the given command line is intended for the CL driver.
239  static bool checkIsCLMode(ArrayRef<std::string> CmdLine) {
240  // First look for --driver-mode.
241  for (StringRef S : llvm::reverse(CmdLine)) {
242  if (S.consume_front("--driver-mode="))
243  return S == "cl";
244  }
245 
246  // Otherwise just check the clang executable file name.
247  return !CmdLine.empty() &&
248  llvm::sys::path::stem(CmdLine.front()).endswith_lower("cl");
249  }
250 
251  // Map the language from the --std flag to that of the -x flag.
252  static types::ID toType(InputKind::Language Lang) {
253  switch (Lang) {
254  case InputKind::C:
255  return types::TY_C;
256  case InputKind::CXX:
257  return types::TY_CXX;
258  case InputKind::ObjC:
259  return types::TY_ObjC;
260  case InputKind::ObjCXX:
261  return types::TY_ObjCXX;
262  default:
263  return types::TY_INVALID;
264  }
265  }
266 
267  // Convert a file type to the matching CL-style type flag.
268  static StringRef toCLFlag(types::ID Type) {
269  switch (Type) {
270  case types::TY_C:
271  case types::TY_CHeader:
272  return "/TC";
273  case types::TY_CXX:
274  case types::TY_CXXHeader:
275  return "/TP";
276  default:
277  return StringRef();
278  }
279  }
280 
281  // Try to interpret the argument as a type specifier, e.g. '-x'.
282  Optional<types::ID> tryParseTypeArg(const llvm::opt::Arg &Arg) {
283  const llvm::opt::Option &Opt = Arg.getOption();
284  using namespace driver::options;
285  if (ClangCLMode) {
286  if (Opt.matches(OPT__SLASH_TC) || Opt.matches(OPT__SLASH_Tc))
287  return types::TY_C;
288  if (Opt.matches(OPT__SLASH_TP) || Opt.matches(OPT__SLASH_Tp))
289  return types::TY_CXX;
290  } else {
291  if (Opt.matches(driver::options::OPT_x))
292  return types::lookupTypeForTypeSpecifier(Arg.getValue());
293  }
294  return None;
295  }
296 
297  // Try to interpret the argument as '-std='.
298  Optional<LangStandard::Kind> tryParseStdArg(const llvm::opt::Arg &Arg) {
299  using namespace driver::options;
300  if (Arg.getOption().matches(ClangCLMode ? OPT__SLASH_std : OPT_std_EQ)) {
301  return llvm::StringSwitch<LangStandard::Kind>(Arg.getValue())
302 #define LANGSTANDARD(id, name, lang, ...) .Case(name, LangStandard::lang_##id)
303 #define LANGSTANDARD_ALIAS(id, alias) .Case(alias, LangStandard::lang_##id)
304 #include "clang/Frontend/LangStandards.def"
305 #undef LANGSTANDARD_ALIAS
306 #undef LANGSTANDARD
308  }
309  return None;
310  }
311 };
312 
313 // Given a filename, FileIndex picks the best matching file from the underlying
314 // DB. This is the proxy file whose CompileCommand will be reused. The
315 // heuristics incorporate file name, extension, and directory structure.
316 // Strategy:
317 // - Build indexes of each of the substrings we want to look up by.
318 // These indexes are just sorted lists of the substrings.
319 // - Each criterion corresponds to a range lookup into the index, so we only
320 // need O(log N) string comparisons to determine scores.
321 //
322 // Apart from path proximity signals, also takes file extensions into account
323 // when scoring the candidates.
324 class FileIndex {
325 public:
326  FileIndex(std::vector<std::string> Files)
327  : OriginalPaths(std::move(Files)), Strings(Arena) {
328  // Sort commands by filename for determinism (index is a tiebreaker later).
329  llvm::sort(OriginalPaths);
330  Paths.reserve(OriginalPaths.size());
331  Types.reserve(OriginalPaths.size());
332  Stems.reserve(OriginalPaths.size());
333  for (size_t I = 0; I < OriginalPaths.size(); ++I) {
334  StringRef Path = Strings.save(StringRef(OriginalPaths[I]).lower());
335 
336  Paths.emplace_back(Path, I);
337  Types.push_back(foldType(guessType(Path)));
338  Stems.emplace_back(sys::path::stem(Path), I);
339  auto Dir = ++sys::path::rbegin(Path), DirEnd = sys::path::rend(Path);
340  for (int J = 0; J < DirectorySegmentsIndexed && Dir != DirEnd; ++J, ++Dir)
341  if (Dir->size() > ShortDirectorySegment) // not trivial ones
342  Components.emplace_back(*Dir, I);
343  }
344  llvm::sort(Paths);
345  llvm::sort(Stems);
346  llvm::sort(Components);
347  }
348 
349  bool empty() const { return Paths.empty(); }
350 
351  // Returns the path for the file that best fits OriginalFilename.
352  // Candidates with extensions matching PreferLanguage will be chosen over
353  // others (unless it's TY_INVALID, or all candidates are bad).
354  StringRef chooseProxy(StringRef OriginalFilename,
355  types::ID PreferLanguage) const {
356  assert(!empty() && "need at least one candidate!");
357  std::string Filename = OriginalFilename.lower();
358  auto Candidates = scoreCandidates(Filename);
359  std::pair<size_t, int> Best =
360  pickWinner(Candidates, Filename, PreferLanguage);
361 
362  DEBUG_WITH_TYPE(
363  "interpolate",
364  llvm::dbgs() << "interpolate: chose " << OriginalPaths[Best.first]
365  << " as proxy for " << OriginalFilename << " preferring "
366  << (PreferLanguage == types::TY_INVALID
367  ? "none"
368  : types::getTypeName(PreferLanguage))
369  << " score=" << Best.second << "\n");
370  return OriginalPaths[Best.first];
371  }
372 
373 private:
374  using SubstringAndIndex = std::pair<StringRef, size_t>;
375  // Directory matching parameters: we look at the last two segments of the
376  // parent directory (usually the semantically significant ones in practice).
377  // We search only the last four of each candidate (for efficiency).
378  constexpr static int DirectorySegmentsIndexed = 4;
379  constexpr static int DirectorySegmentsQueried = 2;
380  constexpr static int ShortDirectorySegment = 1; // Only look at longer names.
381 
382  // Award points to candidate entries that should be considered for the file.
383  // Returned keys are indexes into paths, and the values are (nonzero) scores.
384  DenseMap<size_t, int> scoreCandidates(StringRef Filename) const {
385  // Decompose Filename into the parts we care about.
386  // /some/path/complicated/project/Interesting.h
387  // [-prefix--][---dir---] [-dir-] [--stem---]
388  StringRef Stem = sys::path::stem(Filename);
390  llvm::StringRef Prefix;
391  auto Dir = ++sys::path::rbegin(Filename),
392  DirEnd = sys::path::rend(Filename);
393  for (int I = 0; I < DirectorySegmentsQueried && Dir != DirEnd; ++I, ++Dir) {
394  if (Dir->size() > ShortDirectorySegment)
395  Dirs.push_back(*Dir);
396  Prefix = Filename.substr(0, Dir - DirEnd);
397  }
398 
399  // Now award points based on lookups into our various indexes.
400  DenseMap<size_t, int> Candidates; // Index -> score.
401  auto Award = [&](int Points, ArrayRef<SubstringAndIndex> Range) {
402  for (const auto &Entry : Range)
403  Candidates[Entry.second] += Points;
404  };
405  // Award one point if the file's basename is a prefix of the candidate,
406  // and another if it's an exact match (so exact matches get two points).
407  Award(1, indexLookup</*Prefix=*/true>(Stem, Stems));
408  Award(1, indexLookup</*Prefix=*/false>(Stem, Stems));
409  // For each of the last few directories in the Filename, award a point
410  // if it's present in the candidate.
411  for (StringRef Dir : Dirs)
412  Award(1, indexLookup</*Prefix=*/false>(Dir, Components));
413  // Award one more point if the whole rest of the path matches.
414  if (sys::path::root_directory(Prefix) != Prefix)
415  Award(1, indexLookup</*Prefix=*/true>(Prefix, Paths));
416  return Candidates;
417  }
418 
419  // Pick a single winner from the set of scored candidates.
420  // Returns (index, score).
421  std::pair<size_t, int> pickWinner(const DenseMap<size_t, int> &Candidates,
422  StringRef Filename,
423  types::ID PreferredLanguage) const {
424  struct ScoredCandidate {
425  size_t Index;
426  bool Preferred;
427  int Points;
428  size_t PrefixLength;
429  };
430  // Choose the best candidate by (preferred, points, prefix length, alpha).
431  ScoredCandidate Best = {size_t(-1), false, 0, 0};
432  for (const auto &Candidate : Candidates) {
433  ScoredCandidate S;
434  S.Index = Candidate.first;
435  S.Preferred = PreferredLanguage == types::TY_INVALID ||
436  PreferredLanguage == Types[S.Index];
437  S.Points = Candidate.second;
438  if (!S.Preferred && Best.Preferred)
439  continue;
440  if (S.Preferred == Best.Preferred) {
441  if (S.Points < Best.Points)
442  continue;
443  if (S.Points == Best.Points) {
444  S.PrefixLength = matchingPrefix(Filename, Paths[S.Index].first);
445  if (S.PrefixLength < Best.PrefixLength)
446  continue;
447  // hidden heuristics should at least be deterministic!
448  if (S.PrefixLength == Best.PrefixLength)
449  if (S.Index > Best.Index)
450  continue;
451  }
452  }
453  // PrefixLength was only set above if actually needed for a tiebreak.
454  // But it definitely needs to be set to break ties in the future.
455  S.PrefixLength = matchingPrefix(Filename, Paths[S.Index].first);
456  Best = S;
457  }
458  // Edge case: no candidate got any points.
459  // We ignore PreferredLanguage at this point (not ideal).
460  if (Best.Index == size_t(-1))
461  return {longestMatch(Filename, Paths).second, 0};
462  return {Best.Index, Best.Points};
463  }
464 
465  // Returns the range within a sorted index that compares equal to Key.
466  // If Prefix is true, it's instead the range starting with Key.
467  template <bool Prefix>
469  indexLookup(StringRef Key, ArrayRef<SubstringAndIndex> Idx) const {
470  // Use pointers as iteratiors to ease conversion of result to ArrayRef.
471  auto Range = std::equal_range(Idx.data(), Idx.data() + Idx.size(), Key,
472  Less<Prefix>());
473  return {Range.first, Range.second};
474  }
475 
476  // Performs a point lookup into a nonempty index, returning a longest match.
477  SubstringAndIndex longestMatch(StringRef Key,
478  ArrayRef<SubstringAndIndex> Idx) const {
479  assert(!Idx.empty());
480  // Longest substring match will be adjacent to a direct lookup.
481  auto It = llvm::lower_bound(Idx, SubstringAndIndex{Key, 0});
482  if (It == Idx.begin())
483  return *It;
484  if (It == Idx.end())
485  return *--It;
486  // Have to choose between It and It-1
487  size_t Prefix = matchingPrefix(Key, It->first);
488  size_t PrevPrefix = matchingPrefix(Key, (It - 1)->first);
489  return Prefix > PrevPrefix ? *It : *--It;
490  }
491 
492  // Original paths, everything else is in lowercase.
493  std::vector<std::string> OriginalPaths;
494  BumpPtrAllocator Arena;
495  StringSaver Strings;
496  // Indexes of candidates by certain substrings.
497  // String is lowercase and sorted, index points into OriginalPaths.
498  std::vector<SubstringAndIndex> Paths; // Full path.
499  // Lang types obtained by guessing on the corresponding path. I-th element is
500  // a type for the I-th path.
501  std::vector<types::ID> Types;
502  std::vector<SubstringAndIndex> Stems; // Basename, without extension.
503  std::vector<SubstringAndIndex> Components; // Last path components.
504 };
505 
506 // The actual CompilationDatabase wrapper delegates to its inner database.
507 // If no match, looks up a proxy file in FileIndex and transfers its
508 // command to the requested file.
509 class InterpolatingCompilationDatabase : public CompilationDatabase {
510 public:
511  InterpolatingCompilationDatabase(std::unique_ptr<CompilationDatabase> Inner)
512  : Inner(std::move(Inner)), Index(this->Inner->getAllFiles()) {}
513 
514  std::vector<CompileCommand>
515  getCompileCommands(StringRef Filename) const override {
516  auto Known = Inner->getCompileCommands(Filename);
517  if (Index.empty() || !Known.empty())
518  return Known;
519  bool TypeCertain;
520  auto Lang = guessType(Filename, &TypeCertain);
521  if (!TypeCertain)
522  Lang = types::TY_INVALID;
523  auto ProxyCommands =
524  Inner->getCompileCommands(Index.chooseProxy(Filename, foldType(Lang)));
525  if (ProxyCommands.empty())
526  return {};
527  return {TransferableCommand(ProxyCommands[0]).transferTo(Filename)};
528  }
529 
530  std::vector<std::string> getAllFiles() const override {
531  return Inner->getAllFiles();
532  }
533 
534  std::vector<CompileCommand> getAllCompileCommands() const override {
535  return Inner->getAllCompileCommands();
536  }
537 
538 private:
539  std::unique_ptr<CompilationDatabase> Inner;
540  FileIndex Index;
541 };
542 
543 } // namespace
544 
545 std::unique_ptr<CompilationDatabase>
546 inferMissingCompileCommands(std::unique_ptr<CompilationDatabase> Inner) {
547  return llvm::make_unique<InterpolatingCompilationDatabase>(std::move(Inner));
548 }
549 
550 } // namespace tooling
551 } // namespace clang
Specialize PointerLikeTypeTraits to allow LazyGenerationalUpdatePtr to be placed into a PointerUnion...
Definition: Dominators.h:30
RangeSelector name(std::string ID)
Given a node with a "name", (like NamedDecl, DeclRefExpr or CxxCtorInitializer) selects the name&#39;s to...
static const LangStandard & getLangStandardForKind(Kind K)
Definition: Format.h:2274
__SIZE_TYPE__ size_t
The unsigned integer type of the result of the sizeof operator.
Definition: opencl-c-base.h:40
Languages that the frontend can parse and compile.
CompileCommand Cmd
std::unique_ptr< llvm::opt::OptTable > createDriverOptTable()
StringRef Filename
Definition: Format.cpp:1711
ID lookupHeaderTypeForSourceType(ID Id)
Lookup header file input type that corresponds to given source file type (used for clang-cl emulation...
Definition: Types.cpp:309
const char * getTypeName(ID Id)
getTypeName - Return the name of the type for Id.
Definition: Types.cpp:38
#define V(N, I)
Definition: ASTContext.h:2907
std::unique_ptr< CompilationDatabase > inferMissingCompileCommands(std::unique_ptr< CompilationDatabase >)
Returns a wrapped CompilationDatabase that defers to the provided one, but getCompileCommands() will ...
Optional< types::ID > Type
Dataflow Directional Tag Classes.
static std::string getName(const CallEvent &Call)
Language
The language for the input, used to select and validate the language standard and possible actions...
ID lookupTypeForExtension(llvm::StringRef Ext)
lookupTypeForExtension - Lookup the type to use for the file extension Ext.
Definition: Types.cpp:194
bool onlyPrecompileType(ID Id)
onlyPrecompileType - Should this type only be precompiled.
Definition: Types.cpp:75
__DEVICE__ int min(int __a, int __b)
#define LANGSTANDARD(id, name, lang,...)
ID lookupTypeForTypeSpecifier(const char *Name)
lookupTypeForTypSpecifier - Lookup the type to use for a user specified type name.
Definition: Types.cpp:255
A node that&#39;s not selected.
LangStandard::Kind Std