InitPreprocessor.cpp revision 280031 
1//===--- InitPreprocessor.cpp - PP initialization code. ---------*- C++ -*-===//
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 file implements the clang::InitializePreprocessor function.
11//
12//===----------------------------------------------------------------------===//
13
14#include "clang/Frontend/Utils.h"
15#include "clang/Basic/FileManager.h"
16#include "clang/Basic/MacroBuilder.h"
17#include "clang/Basic/SourceManager.h"
18#include "clang/Basic/TargetInfo.h"
19#include "clang/Basic/Version.h"
20#include "clang/Frontend/FrontendDiagnostic.h"
21#include "clang/Frontend/FrontendOptions.h"
22#include "clang/Lex/HeaderSearch.h"
23#include "clang/Lex/Preprocessor.h"
24#include "clang/Lex/PreprocessorOptions.h"
25#include "clang/Serialization/ASTReader.h"
26#include "llvm/ADT/APFloat.h"
27#include "llvm/Support/FileSystem.h"
28#include "llvm/Support/MemoryBuffer.h"
29#include "llvm/Support/Path.h"
30using namespace clang;
31
32static bool MacroBodyEndsInBackslash(StringRef MacroBody) {
33  while (!MacroBody.empty() && isWhitespace(MacroBody.back()))
34    MacroBody = MacroBody.drop_back();
35  return !MacroBody.empty() && MacroBody.back() == '\\';
36}
37
38// Append a #define line to Buf for Macro.  Macro should be of the form XXX,
39// in which case we emit "#define XXX 1" or "XXX=Y z W" in which case we emit
40// "#define XXX Y z W".  To get a #define with no value, use "XXX=".
41static void DefineBuiltinMacro(MacroBuilder &Builder, StringRef Macro,
42                               DiagnosticsEngine &Diags) {
43  std::pair<StringRef, StringRef> MacroPair = Macro.split('=');
44  StringRef MacroName = MacroPair.first;
45  StringRef MacroBody = MacroPair.second;
46  if (MacroName.size() != Macro.size()) {
47    // Per GCC -D semantics, the macro ends at \n if it exists.
48    StringRef::size_type End = MacroBody.find_first_of("\n\r");
49    if (End != StringRef::npos)
50      Diags.Report(diag::warn_fe_macro_contains_embedded_newline)
51        << MacroName;
52    MacroBody = MacroBody.substr(0, End);
53    // We handle macro bodies which end in a backslash by appending an extra
54    // backslash+newline.  This makes sure we don't accidentally treat the
55    // backslash as a line continuation marker.
56    if (MacroBodyEndsInBackslash(MacroBody))
57      Builder.defineMacro(MacroName, Twine(MacroBody) + "\\\n");
58    else
59      Builder.defineMacro(MacroName, MacroBody);
60  } else {
61    // Push "macroname 1".
62    Builder.defineMacro(Macro);
63  }
64}
65
66/// AddImplicitInclude - Add an implicit \#include of the specified file to the
67/// predefines buffer.
68/// As these includes are generated by -include arguments the header search
69/// logic is going to search relatively to the current working directory.
70static void AddImplicitInclude(MacroBuilder &Builder, StringRef File) {
71  Builder.append(Twine("#include \"") + File + "\"");
72}
73
74static void AddImplicitIncludeMacros(MacroBuilder &Builder, StringRef File) {
75  Builder.append(Twine("#__include_macros \"") + File + "\"");
76  // Marker token to stop the __include_macros fetch loop.
77  Builder.append("##"); // ##?
78}
79
80/// AddImplicitIncludePTH - Add an implicit \#include using the original file
81/// used to generate a PTH cache.
82static void AddImplicitIncludePTH(MacroBuilder &Builder, Preprocessor &PP,
83                                  StringRef ImplicitIncludePTH) {
84  PTHManager *P = PP.getPTHManager();
85  // Null check 'P' in the corner case where it couldn't be created.
86  const char *OriginalFile = P ? P->getOriginalSourceFile() : nullptr;
87
88  if (!OriginalFile) {
89    PP.getDiagnostics().Report(diag::err_fe_pth_file_has_no_source_header)
90      << ImplicitIncludePTH;
91    return;
92  }
93
94  AddImplicitInclude(Builder, OriginalFile);
95}
96
97/// \brief Add an implicit \#include using the original file used to generate
98/// a PCH file.
99static void AddImplicitIncludePCH(MacroBuilder &Builder, Preprocessor &PP,
100                                  StringRef ImplicitIncludePCH) {
101  std::string OriginalFile =
102    ASTReader::getOriginalSourceFile(ImplicitIncludePCH, PP.getFileManager(),
103                                     PP.getDiagnostics());
104  if (OriginalFile.empty())
105    return;
106
107  AddImplicitInclude(Builder, OriginalFile);
108}
109
110/// PickFP - This is used to pick a value based on the FP semantics of the
111/// specified FP model.
112template <typename T>
113static T PickFP(const llvm::fltSemantics *Sem, T IEEESingleVal,
114                T IEEEDoubleVal, T X87DoubleExtendedVal, T PPCDoubleDoubleVal,
115                T IEEEQuadVal) {
116  if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEsingle)
117    return IEEESingleVal;
118  if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEdouble)
119    return IEEEDoubleVal;
120  if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::x87DoubleExtended)
121    return X87DoubleExtendedVal;
122  if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::PPCDoubleDouble)
123    return PPCDoubleDoubleVal;
124  assert(Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEquad);
125  return IEEEQuadVal;
126}
127
128static void DefineFloatMacros(MacroBuilder &Builder, StringRef Prefix,
129                              const llvm::fltSemantics *Sem, StringRef Ext) {
130  const char *DenormMin, *Epsilon, *Max, *Min;
131  DenormMin = PickFP(Sem, "1.40129846e-45", "4.9406564584124654e-324",
132                     "3.64519953188247460253e-4951",
133                     "4.94065645841246544176568792868221e-324",
134                     "6.47517511943802511092443895822764655e-4966");
135  int Digits = PickFP(Sem, 6, 15, 18, 31, 33);
136  Epsilon = PickFP(Sem, "1.19209290e-7", "2.2204460492503131e-16",
137                   "1.08420217248550443401e-19",
138                   "4.94065645841246544176568792868221e-324",
139                   "1.92592994438723585305597794258492732e-34");
140  int MantissaDigits = PickFP(Sem, 24, 53, 64, 106, 113);
141  int Min10Exp = PickFP(Sem, -37, -307, -4931, -291, -4931);
142  int Max10Exp = PickFP(Sem, 38, 308, 4932, 308, 4932);
143  int MinExp = PickFP(Sem, -125, -1021, -16381, -968, -16381);
144  int MaxExp = PickFP(Sem, 128, 1024, 16384, 1024, 16384);
145  Min = PickFP(Sem, "1.17549435e-38", "2.2250738585072014e-308",
146               "3.36210314311209350626e-4932",
147               "2.00416836000897277799610805135016e-292",
148               "3.36210314311209350626267781732175260e-4932");
149  Max = PickFP(Sem, "3.40282347e+38", "1.7976931348623157e+308",
150               "1.18973149535723176502e+4932",
151               "1.79769313486231580793728971405301e+308",
152               "1.18973149535723176508575932662800702e+4932");
153
154  SmallString<32> DefPrefix;
155  DefPrefix = "__";
156  DefPrefix += Prefix;
157  DefPrefix += "_";
158
159  Builder.defineMacro(DefPrefix + "DENORM_MIN__", Twine(DenormMin)+Ext);
160  Builder.defineMacro(DefPrefix + "HAS_DENORM__");
161  Builder.defineMacro(DefPrefix + "DIG__", Twine(Digits));
162  Builder.defineMacro(DefPrefix + "EPSILON__", Twine(Epsilon)+Ext);
163  Builder.defineMacro(DefPrefix + "HAS_INFINITY__");
164  Builder.defineMacro(DefPrefix + "HAS_QUIET_NAN__");
165  Builder.defineMacro(DefPrefix + "MANT_DIG__", Twine(MantissaDigits));
166
167  Builder.defineMacro(DefPrefix + "MAX_10_EXP__", Twine(Max10Exp));
168  Builder.defineMacro(DefPrefix + "MAX_EXP__", Twine(MaxExp));
169  Builder.defineMacro(DefPrefix + "MAX__", Twine(Max)+Ext);
170
171  Builder.defineMacro(DefPrefix + "MIN_10_EXP__","("+Twine(Min10Exp)+")");
172  Builder.defineMacro(DefPrefix + "MIN_EXP__", "("+Twine(MinExp)+")");
173  Builder.defineMacro(DefPrefix + "MIN__", Twine(Min)+Ext);
174}
175
176
177/// DefineTypeSize - Emit a macro to the predefines buffer that declares a macro
178/// named MacroName with the max value for a type with width 'TypeWidth' a
179/// signedness of 'isSigned' and with a value suffix of 'ValSuffix' (e.g. LL).
180static void DefineTypeSize(const Twine &MacroName, unsigned TypeWidth,
181                           StringRef ValSuffix, bool isSigned,
182                           MacroBuilder &Builder) {
183  llvm::APInt MaxVal = isSigned ? llvm::APInt::getSignedMaxValue(TypeWidth)
184                                : llvm::APInt::getMaxValue(TypeWidth);
185  Builder.defineMacro(MacroName, MaxVal.toString(10, isSigned) + ValSuffix);
186}
187
188/// DefineTypeSize - An overloaded helper that uses TargetInfo to determine
189/// the width, suffix, and signedness of the given type
190static void DefineTypeSize(const Twine &MacroName, TargetInfo::IntType Ty,
191                           const TargetInfo &TI, MacroBuilder &Builder) {
192  DefineTypeSize(MacroName, TI.getTypeWidth(Ty), TI.getTypeConstantSuffix(Ty),
193                 TI.isTypeSigned(Ty), Builder);
194}
195
196static void DefineFmt(const Twine &Prefix, TargetInfo::IntType Ty,
197                      const TargetInfo &TI, MacroBuilder &Builder) {
198  bool IsSigned = TI.isTypeSigned(Ty);
199  StringRef FmtModifier = TI.getTypeFormatModifier(Ty);
200  for (const char *Fmt = IsSigned ? "di" : "ouxX"; *Fmt; ++Fmt) {
201    Builder.defineMacro(Prefix + "_FMT" + Twine(*Fmt) + "__",
202                        Twine("\"") + FmtModifier + Twine(*Fmt) + "\"");
203  }
204}
205
206static void DefineType(const Twine &MacroName, TargetInfo::IntType Ty,
207                       MacroBuilder &Builder) {
208  Builder.defineMacro(MacroName, TargetInfo::getTypeName(Ty));
209}
210
211static void DefineTypeWidth(StringRef MacroName, TargetInfo::IntType Ty,
212                            const TargetInfo &TI, MacroBuilder &Builder) {
213  Builder.defineMacro(MacroName, Twine(TI.getTypeWidth(Ty)));
214}
215
216static void DefineTypeSizeof(StringRef MacroName, unsigned BitWidth,
217                             const TargetInfo &TI, MacroBuilder &Builder) {
218  Builder.defineMacro(MacroName,
219                      Twine(BitWidth / TI.getCharWidth()));
220}
221
222static void DefineExactWidthIntType(TargetInfo::IntType Ty,
223                                    const TargetInfo &TI,
224                                    MacroBuilder &Builder) {
225  int TypeWidth = TI.getTypeWidth(Ty);
226  bool IsSigned = TI.isTypeSigned(Ty);
227
228  // Use the target specified int64 type, when appropriate, so that [u]int64_t
229  // ends up being defined in terms of the correct type.
230  if (TypeWidth == 64)
231    Ty = IsSigned ? TI.getInt64Type() : TI.getUInt64Type();
232
233  const char *Prefix = IsSigned ? "__INT" : "__UINT";
234
235  DefineType(Prefix + Twine(TypeWidth) + "_TYPE__", Ty, Builder);
236  DefineFmt(Prefix + Twine(TypeWidth), Ty, TI, Builder);
237
238  StringRef ConstSuffix(TI.getTypeConstantSuffix(Ty));
239  Builder.defineMacro(Prefix + Twine(TypeWidth) + "_C_SUFFIX__", ConstSuffix);
240}
241
242static void DefineExactWidthIntTypeSize(TargetInfo::IntType Ty,
243                                        const TargetInfo &TI,
244                                        MacroBuilder &Builder) {
245  int TypeWidth = TI.getTypeWidth(Ty);
246  bool IsSigned = TI.isTypeSigned(Ty);
247
248  // Use the target specified int64 type, when appropriate, so that [u]int64_t
249  // ends up being defined in terms of the correct type.
250  if (TypeWidth == 64)
251    Ty = IsSigned ? TI.getInt64Type() : TI.getUInt64Type();
252
253  const char *Prefix = IsSigned ? "__INT" : "__UINT";
254  DefineTypeSize(Prefix + Twine(TypeWidth) + "_MAX__", Ty, TI, Builder);
255}
256
257static void DefineLeastWidthIntType(unsigned TypeWidth, bool IsSigned,
258                                    const TargetInfo &TI,
259                                    MacroBuilder &Builder) {
260  TargetInfo::IntType Ty = TI.getLeastIntTypeByWidth(TypeWidth, IsSigned);
261  if (Ty == TargetInfo::NoInt)
262    return;
263
264  const char *Prefix = IsSigned ? "__INT_LEAST" : "__UINT_LEAST";
265  DefineType(Prefix + Twine(TypeWidth) + "_TYPE__", Ty, Builder);
266  DefineTypeSize(Prefix + Twine(TypeWidth) + "_MAX__", Ty, TI, Builder);
267  DefineFmt(Prefix + Twine(TypeWidth), Ty, TI, Builder);
268}
269
270static void DefineFastIntType(unsigned TypeWidth, bool IsSigned,
271                              const TargetInfo &TI, MacroBuilder &Builder) {
272  // stdint.h currently defines the fast int types as equivalent to the least
273  // types.
274  TargetInfo::IntType Ty = TI.getLeastIntTypeByWidth(TypeWidth, IsSigned);
275  if (Ty == TargetInfo::NoInt)
276    return;
277
278  const char *Prefix = IsSigned ? "__INT_FAST" : "__UINT_FAST";
279  DefineType(Prefix + Twine(TypeWidth) + "_TYPE__", Ty, Builder);
280  DefineTypeSize(Prefix + Twine(TypeWidth) + "_MAX__", Ty, TI, Builder);
281
282  DefineFmt(Prefix + Twine(TypeWidth), Ty, TI, Builder);
283}
284
285
286/// Get the value the ATOMIC_*_LOCK_FREE macro should have for a type with
287/// the specified properties.
288static const char *getLockFreeValue(unsigned TypeWidth, unsigned TypeAlign,
289                                    unsigned InlineWidth) {
290  // Fully-aligned, power-of-2 sizes no larger than the inline
291  // width will be inlined as lock-free operations.
292  if (TypeWidth == TypeAlign && (TypeWidth & (TypeWidth - 1)) == 0 &&
293      TypeWidth <= InlineWidth)
294    return "2"; // "always lock free"
295  // We cannot be certain what operations the lib calls might be
296  // able to implement as lock-free on future processors.
297  return "1"; // "sometimes lock free"
298}
299
300/// \brief Add definitions required for a smooth interaction between
301/// Objective-C++ automated reference counting and libstdc++ (4.2).
302static void AddObjCXXARCLibstdcxxDefines(const LangOptions &LangOpts,
303                                         MacroBuilder &Builder) {
304  Builder.defineMacro("_GLIBCXX_PREDEFINED_OBJC_ARC_IS_SCALAR");
305
306  std::string Result;
307  {
308    // Provide specializations for the __is_scalar type trait so that
309    // lifetime-qualified objects are not considered "scalar" types, which
310    // libstdc++ uses as an indicator of the presence of trivial copy, assign,
311    // default-construct, and destruct semantics (none of which hold for
312    // lifetime-qualified objects in ARC).
313    llvm::raw_string_ostream Out(Result);
314
315    Out << "namespace std {\n"
316        << "\n"
317        << "struct __true_type;\n"
318        << "struct __false_type;\n"
319        << "\n";
320
321    Out << "template<typename _Tp> struct __is_scalar;\n"
322        << "\n";
323
324    Out << "template<typename _Tp>\n"
325        << "struct __is_scalar<__attribute__((objc_ownership(strong))) _Tp> {\n"
326        << "  enum { __value = 0 };\n"
327        << "  typedef __false_type __type;\n"
328        << "};\n"
329        << "\n";
330
331    if (LangOpts.ObjCARCWeak) {
332      Out << "template<typename _Tp>\n"
333          << "struct __is_scalar<__attribute__((objc_ownership(weak))) _Tp> {\n"
334          << "  enum { __value = 0 };\n"
335          << "  typedef __false_type __type;\n"
336          << "};\n"
337          << "\n";
338    }
339
340    Out << "template<typename _Tp>\n"
341        << "struct __is_scalar<__attribute__((objc_ownership(autoreleasing)))"
342        << " _Tp> {\n"
343        << "  enum { __value = 0 };\n"
344        << "  typedef __false_type __type;\n"
345        << "};\n"
346        << "\n";
347
348    Out << "}\n";
349  }
350  Builder.append(Result);
351}
352
353static void InitializeStandardPredefinedMacros(const TargetInfo &TI,
354                                               const LangOptions &LangOpts,
355                                               const FrontendOptions &FEOpts,
356                                               MacroBuilder &Builder) {
357  if (!LangOpts.MSVCCompat && !LangOpts.TraditionalCPP)
358    Builder.defineMacro("__STDC__");
359  if (LangOpts.Freestanding)
360    Builder.defineMacro("__STDC_HOSTED__", "0");
361  else
362    Builder.defineMacro("__STDC_HOSTED__");
363
364  if (!LangOpts.CPlusPlus) {
365    if (LangOpts.C11)
366      Builder.defineMacro("__STDC_VERSION__", "201112L");
367    else if (LangOpts.C99)
368      Builder.defineMacro("__STDC_VERSION__", "199901L");
369    else if (!LangOpts.GNUMode && LangOpts.Digraphs)
370      Builder.defineMacro("__STDC_VERSION__", "199409L");
371  } else {
372    // FIXME: Use correct value for C++17.
373    if (LangOpts.CPlusPlus1z)
374      Builder.defineMacro("__cplusplus", "201406L");
375    // C++1y [cpp.predefined]p1:
376    //   The name __cplusplus is defined to the value 201402L when compiling a
377    //   C++ translation unit.
378    else if (LangOpts.CPlusPlus14)
379      Builder.defineMacro("__cplusplus", "201402L");
380    // C++11 [cpp.predefined]p1:
381    //   The name __cplusplus is defined to the value 201103L when compiling a
382    //   C++ translation unit.
383    else if (LangOpts.CPlusPlus11)
384      Builder.defineMacro("__cplusplus", "201103L");
385    // C++03 [cpp.predefined]p1:
386    //   The name __cplusplus is defined to the value 199711L when compiling a
387    //   C++ translation unit.
388    else
389      Builder.defineMacro("__cplusplus", "199711L");
390  }
391
392  // In C11 these are environment macros. In C++11 they are only defined
393  // as part of <cuchar>. To prevent breakage when mixing C and C++
394  // code, define these macros unconditionally. We can define them
395  // unconditionally, as Clang always uses UTF-16 and UTF-32 for 16-bit
396  // and 32-bit character literals.
397  Builder.defineMacro("__STDC_UTF_16__", "1");
398  Builder.defineMacro("__STDC_UTF_32__", "1");
399
400  if (LangOpts.ObjC1)
401    Builder.defineMacro("__OBJC__");
402
403  // Not "standard" per se, but available even with the -undef flag.
404  if (LangOpts.AsmPreprocessor)
405    Builder.defineMacro("__ASSEMBLER__");
406}
407
408/// Initialize the predefined C++ language feature test macros defined in
409/// ISO/IEC JTC1/SC22/WG21 (C++) SD-6: "SG10 Feature Test Recommendations".
410static void InitializeCPlusPlusFeatureTestMacros(const LangOptions &LangOpts,
411                                                 MacroBuilder &Builder) {
412  // C++98 features.
413  if (LangOpts.RTTI)
414    Builder.defineMacro("__cpp_rtti", "199711");
415  if (LangOpts.CXXExceptions)
416    Builder.defineMacro("__cpp_exceptions", "199711");
417
418  // C++11 features.
419  if (LangOpts.CPlusPlus11) {
420    Builder.defineMacro("__cpp_unicode_characters", "200704");
421    Builder.defineMacro("__cpp_raw_strings", "200710");
422    Builder.defineMacro("__cpp_unicode_literals", "200710");
423    Builder.defineMacro("__cpp_user_defined_literals", "200809");
424    Builder.defineMacro("__cpp_lambdas", "200907");
425    Builder.defineMacro("__cpp_constexpr",
426                        LangOpts.CPlusPlus14 ? "201304" : "200704");
427    Builder.defineMacro("__cpp_range_based_for", "200907");
428    Builder.defineMacro("__cpp_static_assert", "200410");
429    Builder.defineMacro("__cpp_decltype", "200707");
430    Builder.defineMacro("__cpp_attributes", "200809");
431    Builder.defineMacro("__cpp_rvalue_references", "200610");
432    Builder.defineMacro("__cpp_variadic_templates", "200704");
433    Builder.defineMacro("__cpp_initializer_lists", "200806");
434    Builder.defineMacro("__cpp_delegating_constructors", "200604");
435    Builder.defineMacro("__cpp_nsdmi", "200809");
436    Builder.defineMacro("__cpp_inheriting_constructors", "200802");
437    Builder.defineMacro("__cpp_ref_qualifiers", "200710");
438    Builder.defineMacro("__cpp_alias_templates", "200704");
439  }
440
441  // C++14 features.
442  if (LangOpts.CPlusPlus14) {
443    Builder.defineMacro("__cpp_binary_literals", "201304");
444    Builder.defineMacro("__cpp_digit_separators", "201309");
445    Builder.defineMacro("__cpp_init_captures", "201304");
446    Builder.defineMacro("__cpp_generic_lambdas", "201304");
447    Builder.defineMacro("__cpp_decltype_auto", "201304");
448    Builder.defineMacro("__cpp_return_type_deduction", "201304");
449    Builder.defineMacro("__cpp_aggregate_nsdmi", "201304");
450    Builder.defineMacro("__cpp_variable_templates", "201304");
451  }
452  if (LangOpts.SizedDeallocation)
453    Builder.defineMacro("__cpp_sized_deallocation", "201309");
454}
455
456static void InitializePredefinedMacros(const TargetInfo &TI,
457                                       const LangOptions &LangOpts,
458                                       const FrontendOptions &FEOpts,
459                                       MacroBuilder &Builder) {
460  // Compiler version introspection macros.
461  Builder.defineMacro("__llvm__");  // LLVM Backend
462  Builder.defineMacro("__clang__"); // Clang Frontend
463#define TOSTR2(X) #X
464#define TOSTR(X) TOSTR2(X)
465  Builder.defineMacro("__clang_major__", TOSTR(CLANG_VERSION_MAJOR));
466  Builder.defineMacro("__clang_minor__", TOSTR(CLANG_VERSION_MINOR));
467#ifdef CLANG_VERSION_PATCHLEVEL
468  Builder.defineMacro("__clang_patchlevel__", TOSTR(CLANG_VERSION_PATCHLEVEL));
469#else
470  Builder.defineMacro("__clang_patchlevel__", "0");
471#endif
472  Builder.defineMacro("__clang_version__",
473                      "\"" CLANG_VERSION_STRING " "
474                      + getClangFullRepositoryVersion() + "\"");
475#undef TOSTR
476#undef TOSTR2
477  if (!LangOpts.MSVCCompat) {
478    // Currently claim to be compatible with GCC 4.2.1-5621, but only if we're
479    // not compiling for MSVC compatibility
480    Builder.defineMacro("__GNUC_MINOR__", "2");
481    Builder.defineMacro("__GNUC_PATCHLEVEL__", "1");
482    Builder.defineMacro("__GNUC__", "4");
483    Builder.defineMacro("__GXX_ABI_VERSION", "1002");
484  }
485
486  // Define macros for the C11 / C++11 memory orderings
487  Builder.defineMacro("__ATOMIC_RELAXED", "0");
488  Builder.defineMacro("__ATOMIC_CONSUME", "1");
489  Builder.defineMacro("__ATOMIC_ACQUIRE", "2");
490  Builder.defineMacro("__ATOMIC_RELEASE", "3");
491  Builder.defineMacro("__ATOMIC_ACQ_REL", "4");
492  Builder.defineMacro("__ATOMIC_SEQ_CST", "5");
493
494  // Support for #pragma redefine_extname (Sun compatibility)
495  Builder.defineMacro("__PRAGMA_REDEFINE_EXTNAME", "1");
496
497  // As sad as it is, enough software depends on the __VERSION__ for version
498  // checks that it is necessary to report 4.2.1 (the base GCC version we claim
499  // compatibility with) first.
500  Builder.defineMacro("__VERSION__", "\"4.2.1 Compatible " +
501                      Twine(getClangFullCPPVersion()) + "\"");
502
503  // Initialize language-specific preprocessor defines.
504
505  // Standard conforming mode?
506  if (!LangOpts.GNUMode && !LangOpts.MSVCCompat)
507    Builder.defineMacro("__STRICT_ANSI__");
508
509  if (!LangOpts.MSVCCompat && LangOpts.CPlusPlus11)
510    Builder.defineMacro("__GXX_EXPERIMENTAL_CXX0X__");
511
512  if (LangOpts.ObjC1) {
513    if (LangOpts.ObjCRuntime.isNonFragile()) {
514      Builder.defineMacro("__OBJC2__");
515
516      if (LangOpts.ObjCExceptions)
517        Builder.defineMacro("OBJC_ZEROCOST_EXCEPTIONS");
518    }
519
520    if (LangOpts.getGC() != LangOptions::NonGC)
521      Builder.defineMacro("__OBJC_GC__");
522
523    if (LangOpts.ObjCRuntime.isNeXTFamily())
524      Builder.defineMacro("__NEXT_RUNTIME__");
525
526    if (LangOpts.ObjCRuntime.getKind() == ObjCRuntime::ObjFW) {
527      VersionTuple tuple = LangOpts.ObjCRuntime.getVersion();
528
529      unsigned minor = 0;
530      if (tuple.getMinor().hasValue())
531        minor = tuple.getMinor().getValue();
532
533      unsigned subminor = 0;
534      if (tuple.getSubminor().hasValue())
535        subminor = tuple.getSubminor().getValue();
536
537      Builder.defineMacro("__OBJFW_RUNTIME_ABI__",
538                          Twine(tuple.getMajor() * 10000 + minor * 100 +
539                                subminor));
540    }
541
542    Builder.defineMacro("IBOutlet", "__attribute__((iboutlet))");
543    Builder.defineMacro("IBOutletCollection(ClassName)",
544                        "__attribute__((iboutletcollection(ClassName)))");
545    Builder.defineMacro("IBAction", "void)__attribute__((ibaction)");
546    Builder.defineMacro("IBInspectable", "");
547    Builder.defineMacro("IB_DESIGNABLE", "");
548  }
549
550  if (LangOpts.CPlusPlus)
551    InitializeCPlusPlusFeatureTestMacros(LangOpts, Builder);
552
553  // darwin_constant_cfstrings controls this. This is also dependent
554  // on other things like the runtime I believe.  This is set even for C code.
555  if (!LangOpts.NoConstantCFStrings)
556      Builder.defineMacro("__CONSTANT_CFSTRINGS__");
557
558  if (LangOpts.ObjC2)
559    Builder.defineMacro("OBJC_NEW_PROPERTIES");
560
561  if (LangOpts.PascalStrings)
562    Builder.defineMacro("__PASCAL_STRINGS__");
563
564  if (LangOpts.Blocks) {
565    Builder.defineMacro("__block", "__attribute__((__blocks__(byref)))");
566    Builder.defineMacro("__BLOCKS__");
567  }
568
569  if (!LangOpts.MSVCCompat && LangOpts.Exceptions)
570    Builder.defineMacro("__EXCEPTIONS");
571  if (!LangOpts.MSVCCompat && LangOpts.RTTI)
572    Builder.defineMacro("__GXX_RTTI");
573  if (LangOpts.SjLjExceptions)
574    Builder.defineMacro("__USING_SJLJ_EXCEPTIONS__");
575
576  if (LangOpts.Deprecated)
577    Builder.defineMacro("__DEPRECATED");
578
579  if (!LangOpts.MSVCCompat && LangOpts.CPlusPlus) {
580    Builder.defineMacro("__GNUG__", "4");
581    Builder.defineMacro("__GXX_WEAK__");
582    Builder.defineMacro("__private_extern__", "extern");
583  }
584
585  if (LangOpts.MicrosoftExt) {
586    if (LangOpts.WChar) {
587      // wchar_t supported as a keyword.
588      Builder.defineMacro("_WCHAR_T_DEFINED");
589      Builder.defineMacro("_NATIVE_WCHAR_T_DEFINED");
590    }
591  }
592
593  if (LangOpts.Optimize)
594    Builder.defineMacro("__OPTIMIZE__");
595  if (LangOpts.OptimizeSize)
596    Builder.defineMacro("__OPTIMIZE_SIZE__");
597
598  if (LangOpts.FastMath)
599    Builder.defineMacro("__FAST_MATH__");
600
601  // Initialize target-specific preprocessor defines.
602
603  // __BYTE_ORDER__ was added in GCC 4.6. It's analogous
604  // to the macro __BYTE_ORDER (no trailing underscores)
605  // from glibc's <endian.h> header.
606  // We don't support the PDP-11 as a target, but include
607  // the define so it can still be compared against.
608  Builder.defineMacro("__ORDER_LITTLE_ENDIAN__", "1234");
609  Builder.defineMacro("__ORDER_BIG_ENDIAN__",    "4321");
610  Builder.defineMacro("__ORDER_PDP_ENDIAN__",    "3412");
611  if (TI.isBigEndian()) {
612    Builder.defineMacro("__BYTE_ORDER__", "__ORDER_BIG_ENDIAN__");
613    Builder.defineMacro("__BIG_ENDIAN__");
614  } else {
615    Builder.defineMacro("__BYTE_ORDER__", "__ORDER_LITTLE_ENDIAN__");
616    Builder.defineMacro("__LITTLE_ENDIAN__");
617  }
618
619  if (TI.getPointerWidth(0) == 64 && TI.getLongWidth() == 64
620      && TI.getIntWidth() == 32) {
621    Builder.defineMacro("_LP64");
622    Builder.defineMacro("__LP64__");
623  }
624
625  if (TI.getPointerWidth(0) == 32 && TI.getLongWidth() == 32
626      && TI.getIntWidth() == 32) {
627    Builder.defineMacro("_ILP32");
628    Builder.defineMacro("__ILP32__");
629  }
630
631  // Define type sizing macros based on the target properties.
632  assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far");
633  Builder.defineMacro("__CHAR_BIT__", "8");
634
635  DefineTypeSize("__SCHAR_MAX__", TargetInfo::SignedChar, TI, Builder);
636  DefineTypeSize("__SHRT_MAX__", TargetInfo::SignedShort, TI, Builder);
637  DefineTypeSize("__INT_MAX__", TargetInfo::SignedInt, TI, Builder);
638  DefineTypeSize("__LONG_MAX__", TargetInfo::SignedLong, TI, Builder);
639  DefineTypeSize("__LONG_LONG_MAX__", TargetInfo::SignedLongLong, TI, Builder);
640  DefineTypeSize("__WCHAR_MAX__", TI.getWCharType(), TI, Builder);
641  DefineTypeSize("__INTMAX_MAX__", TI.getIntMaxType(), TI, Builder);
642  DefineTypeSize("__SIZE_MAX__", TI.getSizeType(), TI, Builder);
643
644  DefineTypeSize("__UINTMAX_MAX__", TI.getUIntMaxType(), TI, Builder);
645  DefineTypeSize("__PTRDIFF_MAX__", TI.getPtrDiffType(0), TI, Builder);
646  DefineTypeSize("__INTPTR_MAX__", TI.getIntPtrType(), TI, Builder);
647  DefineTypeSize("__UINTPTR_MAX__", TI.getUIntPtrType(), TI, Builder);
648
649  DefineTypeSizeof("__SIZEOF_DOUBLE__", TI.getDoubleWidth(), TI, Builder);
650  DefineTypeSizeof("__SIZEOF_FLOAT__", TI.getFloatWidth(), TI, Builder);
651  DefineTypeSizeof("__SIZEOF_INT__", TI.getIntWidth(), TI, Builder);
652  DefineTypeSizeof("__SIZEOF_LONG__", TI.getLongWidth(), TI, Builder);
653  DefineTypeSizeof("__SIZEOF_LONG_DOUBLE__",TI.getLongDoubleWidth(),TI,Builder);
654  DefineTypeSizeof("__SIZEOF_LONG_LONG__", TI.getLongLongWidth(), TI, Builder);
655  DefineTypeSizeof("__SIZEOF_POINTER__", TI.getPointerWidth(0), TI, Builder);
656  DefineTypeSizeof("__SIZEOF_SHORT__", TI.getShortWidth(), TI, Builder);
657  DefineTypeSizeof("__SIZEOF_PTRDIFF_T__",
658                   TI.getTypeWidth(TI.getPtrDiffType(0)), TI, Builder);
659  DefineTypeSizeof("__SIZEOF_SIZE_T__",
660                   TI.getTypeWidth(TI.getSizeType()), TI, Builder);
661  DefineTypeSizeof("__SIZEOF_WCHAR_T__",
662                   TI.getTypeWidth(TI.getWCharType()), TI, Builder);
663  DefineTypeSizeof("__SIZEOF_WINT_T__",
664                   TI.getTypeWidth(TI.getWIntType()), TI, Builder);
665  // This is a temporary workaround while MIPS64 has not yet fully supported
666  // 128-bit integers. But declaration of int128 type is necessary even though
667  // __SIZEOF_INT128__ is undefined because c++ standard header files like
668  // limits throw error message if __int128 is not available.
669  if (TI.hasInt128Type() && !(TI.getTriple().getArch() == llvm::Triple::mips64el
670                   || TI.getTriple().getArch() == llvm::Triple::mips64))
671    DefineTypeSizeof("__SIZEOF_INT128__", 128, TI, Builder);
672
673  DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Builder);
674  DefineFmt("__INTMAX", TI.getIntMaxType(), TI, Builder);
675  Builder.defineMacro("__INTMAX_C_SUFFIX__",
676                      TI.getTypeConstantSuffix(TI.getIntMaxType()));
677  DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Builder);
678  DefineFmt("__UINTMAX", TI.getUIntMaxType(), TI, Builder);
679  Builder.defineMacro("__UINTMAX_C_SUFFIX__",
680                      TI.getTypeConstantSuffix(TI.getUIntMaxType()));
681  DefineTypeWidth("__INTMAX_WIDTH__",  TI.getIntMaxType(), TI, Builder);
682  DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Builder);
683  DefineFmt("__PTRDIFF", TI.getPtrDiffType(0), TI, Builder);
684  DefineTypeWidth("__PTRDIFF_WIDTH__", TI.getPtrDiffType(0), TI, Builder);
685  DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Builder);
686  DefineFmt("__INTPTR", TI.getIntPtrType(), TI, Builder);
687  DefineTypeWidth("__INTPTR_WIDTH__", TI.getIntPtrType(), TI, Builder);
688  DefineType("__SIZE_TYPE__", TI.getSizeType(), Builder);
689  DefineFmt("__SIZE", TI.getSizeType(), TI, Builder);
690  DefineTypeWidth("__SIZE_WIDTH__", TI.getSizeType(), TI, Builder);
691  DefineType("__WCHAR_TYPE__", TI.getWCharType(), Builder);
692  DefineTypeWidth("__WCHAR_WIDTH__", TI.getWCharType(), TI, Builder);
693  DefineType("__WINT_TYPE__", TI.getWIntType(), Builder);
694  DefineTypeWidth("__WINT_WIDTH__", TI.getWIntType(), TI, Builder);
695  DefineTypeWidth("__SIG_ATOMIC_WIDTH__", TI.getSigAtomicType(), TI, Builder);
696  DefineTypeSize("__SIG_ATOMIC_MAX__", TI.getSigAtomicType(), TI, Builder);
697  DefineType("__CHAR16_TYPE__", TI.getChar16Type(), Builder);
698  DefineType("__CHAR32_TYPE__", TI.getChar32Type(), Builder);
699
700  DefineTypeWidth("__UINTMAX_WIDTH__",  TI.getUIntMaxType(), TI, Builder);
701  DefineType("__UINTPTR_TYPE__", TI.getUIntPtrType(), Builder);
702  DefineFmt("__UINTPTR", TI.getUIntPtrType(), TI, Builder);
703  DefineTypeWidth("__UINTPTR_WIDTH__", TI.getUIntPtrType(), TI, Builder);
704
705  DefineFloatMacros(Builder, "FLT", &TI.getFloatFormat(), "F");
706  DefineFloatMacros(Builder, "DBL", &TI.getDoubleFormat(), "");
707  DefineFloatMacros(Builder, "LDBL", &TI.getLongDoubleFormat(), "L");
708
709  // Define a __POINTER_WIDTH__ macro for stdint.h.
710  Builder.defineMacro("__POINTER_WIDTH__",
711                      Twine((int)TI.getPointerWidth(0)));
712
713  if (!LangOpts.CharIsSigned)
714    Builder.defineMacro("__CHAR_UNSIGNED__");
715
716  if (!TargetInfo::isTypeSigned(TI.getWCharType()))
717    Builder.defineMacro("__WCHAR_UNSIGNED__");
718
719  if (!TargetInfo::isTypeSigned(TI.getWIntType()))
720    Builder.defineMacro("__WINT_UNSIGNED__");
721
722  // Define exact-width integer types for stdint.h
723  DefineExactWidthIntType(TargetInfo::SignedChar, TI, Builder);
724
725  if (TI.getShortWidth() > TI.getCharWidth())
726    DefineExactWidthIntType(TargetInfo::SignedShort, TI, Builder);
727
728  if (TI.getIntWidth() > TI.getShortWidth())
729    DefineExactWidthIntType(TargetInfo::SignedInt, TI, Builder);
730
731  if (TI.getLongWidth() > TI.getIntWidth())
732    DefineExactWidthIntType(TargetInfo::SignedLong, TI, Builder);
733
734  if (TI.getLongLongWidth() > TI.getLongWidth())
735    DefineExactWidthIntType(TargetInfo::SignedLongLong, TI, Builder);
736
737  DefineExactWidthIntType(TargetInfo::UnsignedChar, TI, Builder);
738  DefineExactWidthIntTypeSize(TargetInfo::UnsignedChar, TI, Builder);
739  DefineExactWidthIntTypeSize(TargetInfo::SignedChar, TI, Builder);
740
741  if (TI.getShortWidth() > TI.getCharWidth()) {
742    DefineExactWidthIntType(TargetInfo::UnsignedShort, TI, Builder);
743    DefineExactWidthIntTypeSize(TargetInfo::UnsignedShort, TI, Builder);
744    DefineExactWidthIntTypeSize(TargetInfo::SignedShort, TI, Builder);
745  }
746
747  if (TI.getIntWidth() > TI.getShortWidth()) {
748    DefineExactWidthIntType(TargetInfo::UnsignedInt, TI, Builder);
749    DefineExactWidthIntTypeSize(TargetInfo::UnsignedInt, TI, Builder);
750    DefineExactWidthIntTypeSize(TargetInfo::SignedInt, TI, Builder);
751  }
752
753  if (TI.getLongWidth() > TI.getIntWidth()) {
754    DefineExactWidthIntType(TargetInfo::UnsignedLong, TI, Builder);
755    DefineExactWidthIntTypeSize(TargetInfo::UnsignedLong, TI, Builder);
756    DefineExactWidthIntTypeSize(TargetInfo::SignedLong, TI, Builder);
757  }
758
759  if (TI.getLongLongWidth() > TI.getLongWidth()) {
760    DefineExactWidthIntType(TargetInfo::UnsignedLongLong, TI, Builder);
761    DefineExactWidthIntTypeSize(TargetInfo::UnsignedLongLong, TI, Builder);
762    DefineExactWidthIntTypeSize(TargetInfo::SignedLongLong, TI, Builder);
763  }
764
765  DefineLeastWidthIntType(8, true, TI, Builder);
766  DefineLeastWidthIntType(8, false, TI, Builder);
767  DefineLeastWidthIntType(16, true, TI, Builder);
768  DefineLeastWidthIntType(16, false, TI, Builder);
769  DefineLeastWidthIntType(32, true, TI, Builder);
770  DefineLeastWidthIntType(32, false, TI, Builder);
771  DefineLeastWidthIntType(64, true, TI, Builder);
772  DefineLeastWidthIntType(64, false, TI, Builder);
773
774  DefineFastIntType(8, true, TI, Builder);
775  DefineFastIntType(8, false, TI, Builder);
776  DefineFastIntType(16, true, TI, Builder);
777  DefineFastIntType(16, false, TI, Builder);
778  DefineFastIntType(32, true, TI, Builder);
779  DefineFastIntType(32, false, TI, Builder);
780  DefineFastIntType(64, true, TI, Builder);
781  DefineFastIntType(64, false, TI, Builder);
782
783  if (const char *Prefix = TI.getUserLabelPrefix())
784    Builder.defineMacro("__USER_LABEL_PREFIX__", Prefix);
785
786  if (LangOpts.FastMath || LangOpts.FiniteMathOnly)
787    Builder.defineMacro("__FINITE_MATH_ONLY__", "1");
788  else
789    Builder.defineMacro("__FINITE_MATH_ONLY__", "0");
790
791  if (!LangOpts.MSVCCompat) {
792    if (LangOpts.GNUInline)
793      Builder.defineMacro("__GNUC_GNU_INLINE__");
794    else
795      Builder.defineMacro("__GNUC_STDC_INLINE__");
796
797    // The value written by __atomic_test_and_set.
798    // FIXME: This is target-dependent.
799    Builder.defineMacro("__GCC_ATOMIC_TEST_AND_SET_TRUEVAL", "1");
800
801    // Used by libstdc++ to implement ATOMIC_<foo>_LOCK_FREE.
802    unsigned InlineWidthBits = TI.getMaxAtomicInlineWidth();
803#define DEFINE_LOCK_FREE_MACRO(TYPE, Type) \
804    Builder.defineMacro("__GCC_ATOMIC_" #TYPE "_LOCK_FREE", \
805                        getLockFreeValue(TI.get##Type##Width(), \
806                                         TI.get##Type##Align(), \
807                                         InlineWidthBits));
808    DEFINE_LOCK_FREE_MACRO(BOOL, Bool);
809    DEFINE_LOCK_FREE_MACRO(CHAR, Char);
810    DEFINE_LOCK_FREE_MACRO(CHAR16_T, Char16);
811    DEFINE_LOCK_FREE_MACRO(CHAR32_T, Char32);
812    DEFINE_LOCK_FREE_MACRO(WCHAR_T, WChar);
813    DEFINE_LOCK_FREE_MACRO(SHORT, Short);
814    DEFINE_LOCK_FREE_MACRO(INT, Int);
815    DEFINE_LOCK_FREE_MACRO(LONG, Long);
816    DEFINE_LOCK_FREE_MACRO(LLONG, LongLong);
817    Builder.defineMacro("__GCC_ATOMIC_POINTER_LOCK_FREE",
818                        getLockFreeValue(TI.getPointerWidth(0),
819                                         TI.getPointerAlign(0),
820                                         InlineWidthBits));
821#undef DEFINE_LOCK_FREE_MACRO
822  }
823
824  if (LangOpts.NoInlineDefine)
825    Builder.defineMacro("__NO_INLINE__");
826
827  if (unsigned PICLevel = LangOpts.PICLevel) {
828    Builder.defineMacro("__PIC__", Twine(PICLevel));
829    Builder.defineMacro("__pic__", Twine(PICLevel));
830  }
831  if (unsigned PIELevel = LangOpts.PIELevel) {
832    Builder.defineMacro("__PIE__", Twine(PIELevel));
833    Builder.defineMacro("__pie__", Twine(PIELevel));
834  }
835
836  // Macros to control C99 numerics and <float.h>
837  Builder.defineMacro("__FLT_EVAL_METHOD__", Twine(TI.getFloatEvalMethod()));
838  Builder.defineMacro("__FLT_RADIX__", "2");
839  int Dig = PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33, 36);
840  Builder.defineMacro("__DECIMAL_DIG__", Twine(Dig));
841
842  if (LangOpts.getStackProtector() == LangOptions::SSPOn)
843    Builder.defineMacro("__SSP__");
844  else if (LangOpts.getStackProtector() == LangOptions::SSPStrong)
845    Builder.defineMacro("__SSP_STRONG__", "2");
846  else if (LangOpts.getStackProtector() == LangOptions::SSPReq)
847    Builder.defineMacro("__SSP_ALL__", "3");
848
849  if (FEOpts.ProgramAction == frontend::RewriteObjC)
850    Builder.defineMacro("__weak", "__attribute__((objc_gc(weak)))");
851
852  // Define a macro that exists only when using the static analyzer.
853  if (FEOpts.ProgramAction == frontend::RunAnalysis)
854    Builder.defineMacro("__clang_analyzer__");
855
856  if (LangOpts.FastRelaxedMath)
857    Builder.defineMacro("__FAST_RELAXED_MATH__");
858
859  if (LangOpts.ObjCAutoRefCount) {
860    Builder.defineMacro("__weak", "__attribute__((objc_ownership(weak)))");
861    Builder.defineMacro("__strong", "__attribute__((objc_ownership(strong)))");
862    Builder.defineMacro("__autoreleasing",
863                        "__attribute__((objc_ownership(autoreleasing)))");
864    Builder.defineMacro("__unsafe_unretained",
865                        "__attribute__((objc_ownership(none)))");
866  }
867
868  // OpenMP definition
869  if (LangOpts.OpenMP) {
870    // OpenMP 2.2:
871    //   In implementations that support a preprocessor, the _OPENMP
872    //   macro name is defined to have the decimal value yyyymm where
873    //   yyyy and mm are the year and the month designations of the
874    //   version of the OpenMP API that the implementation support.
875    Builder.defineMacro("_OPENMP", "201307");
876  }
877
878  // CUDA device path compilaton
879  if (LangOpts.CUDAIsDevice) {
880    // The CUDA_ARCH value is set for the GPU target specified in the NVPTX
881    // backend's target defines.
882    Builder.defineMacro("__CUDA_ARCH__");
883  }
884
885  // Get other target #defines.
886  TI.getTargetDefines(LangOpts, Builder);
887}
888
889/// InitializePreprocessor - Initialize the preprocessor getting it and the
890/// environment ready to process a single file. This returns true on error.
891///
892void clang::InitializePreprocessor(Preprocessor &PP,
893                                   const PreprocessorOptions &InitOpts,
894                                   const FrontendOptions &FEOpts) {
895  const LangOptions &LangOpts = PP.getLangOpts();
896  std::string PredefineBuffer;
897  PredefineBuffer.reserve(4080);
898  llvm::raw_string_ostream Predefines(PredefineBuffer);
899  MacroBuilder Builder(Predefines);
900
901  // Emit line markers for various builtin sections of the file.  We don't do
902  // this in asm preprocessor mode, because "# 4" is not a line marker directive
903  // in this mode.
904  if (!PP.getLangOpts().AsmPreprocessor)
905    Builder.append("# 1 \"<built-in>\" 3");
906
907  // Install things like __POWERPC__, __GNUC__, etc into the macro table.
908  if (InitOpts.UsePredefines) {
909    InitializePredefinedMacros(PP.getTargetInfo(), LangOpts, FEOpts, Builder);
910
911    // Install definitions to make Objective-C++ ARC work well with various
912    // C++ Standard Library implementations.
913    if (LangOpts.ObjC1 && LangOpts.CPlusPlus && LangOpts.ObjCAutoRefCount) {
914      switch (InitOpts.ObjCXXARCStandardLibrary) {
915      case ARCXX_nolib:
916        case ARCXX_libcxx:
917        break;
918
919      case ARCXX_libstdcxx:
920        AddObjCXXARCLibstdcxxDefines(LangOpts, Builder);
921        break;
922      }
923    }
924  }
925
926  // Even with predefines off, some macros are still predefined.
927  // These should all be defined in the preprocessor according to the
928  // current language configuration.
929  InitializeStandardPredefinedMacros(PP.getTargetInfo(), PP.getLangOpts(),
930                                     FEOpts, Builder);
931
932  // Add on the predefines from the driver.  Wrap in a #line directive to report
933  // that they come from the command line.
934  if (!PP.getLangOpts().AsmPreprocessor)
935    Builder.append("# 1 \"<command line>\" 1");
936
937  // Process #define's and #undef's in the order they are given.
938  for (unsigned i = 0, e = InitOpts.Macros.size(); i != e; ++i) {
939    if (InitOpts.Macros[i].second)  // isUndef
940      Builder.undefineMacro(InitOpts.Macros[i].first);
941    else
942      DefineBuiltinMacro(Builder, InitOpts.Macros[i].first,
943                         PP.getDiagnostics());
944  }
945
946  // If -imacros are specified, include them now.  These are processed before
947  // any -include directives.
948  for (unsigned i = 0, e = InitOpts.MacroIncludes.size(); i != e; ++i)
949    AddImplicitIncludeMacros(Builder, InitOpts.MacroIncludes[i]);
950
951  // Process -include-pch/-include-pth directives.
952  if (!InitOpts.ImplicitPCHInclude.empty())
953    AddImplicitIncludePCH(Builder, PP, InitOpts.ImplicitPCHInclude);
954  if (!InitOpts.ImplicitPTHInclude.empty())
955    AddImplicitIncludePTH(Builder, PP, InitOpts.ImplicitPTHInclude);
956
957  // Process -include directives.
958  for (unsigned i = 0, e = InitOpts.Includes.size(); i != e; ++i) {
959    const std::string &Path = InitOpts.Includes[i];
960    AddImplicitInclude(Builder, Path);
961  }
962
963  // Exit the command line and go back to <built-in> (2 is LC_LEAVE).
964  if (!PP.getLangOpts().AsmPreprocessor)
965    Builder.append("# 1 \"<built-in>\" 2");
966
967  // Instruct the preprocessor to skip the preamble.
968  PP.setSkipMainFilePreamble(InitOpts.PrecompiledPreambleBytes.first,
969                             InitOpts.PrecompiledPreambleBytes.second);
970
971  // Copy PredefinedBuffer into the Preprocessor.
972  PP.setPredefines(Predefines.str());
973}
974