InitPreprocessor.cpp revision 809d1be9820039b4cf6efa48246a0d70ffa13394 
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/Basic/Version.h"
15#include "clang/Frontend/Utils.h"
16#include "clang/Basic/MacroBuilder.h"
17#include "clang/Basic/TargetInfo.h"
18#include "clang/Frontend/FrontendDiagnostic.h"
19#include "clang/Frontend/FrontendOptions.h"
20#include "clang/Frontend/PreprocessorOptions.h"
21#include "clang/Lex/HeaderSearch.h"
22#include "clang/Lex/Preprocessor.h"
23#include "clang/Basic/FileManager.h"
24#include "clang/Basic/SourceManager.h"
25#include "llvm/ADT/APFloat.h"
26#include "llvm/Support/FileSystem.h"
27#include "llvm/Support/MemoryBuffer.h"
28#include "llvm/Support/Path.h"
29using namespace clang;
30
31// Append a #define line to Buf for Macro.  Macro should be of the form XXX,
32// in which case we emit "#define XXX 1" or "XXX=Y z W" in which case we emit
33// "#define XXX Y z W".  To get a #define with no value, use "XXX=".
34static void DefineBuiltinMacro(MacroBuilder &Builder, StringRef Macro,
35                               DiagnosticsEngine &Diags) {
36  std::pair<StringRef, StringRef> MacroPair = Macro.split('=');
37  StringRef MacroName = MacroPair.first;
38  StringRef MacroBody = MacroPair.second;
39  if (MacroName.size() != Macro.size()) {
40    // Per GCC -D semantics, the macro ends at \n if it exists.
41    StringRef::size_type End = MacroBody.find_first_of("\n\r");
42    if (End != StringRef::npos)
43      Diags.Report(diag::warn_fe_macro_contains_embedded_newline)
44        << MacroName;
45    Builder.defineMacro(MacroName, MacroBody.substr(0, End));
46  } else {
47    // Push "macroname 1".
48    Builder.defineMacro(Macro);
49  }
50}
51
52/// AddImplicitInclude - Add an implicit \#include of the specified file to the
53/// predefines buffer.
54static void AddImplicitInclude(MacroBuilder &Builder, StringRef File,
55                               FileManager &FileMgr) {
56  Builder.append(Twine("#include \"") +
57                 HeaderSearch::NormalizeDashIncludePath(File, FileMgr) + "\"");
58}
59
60static void AddImplicitIncludeMacros(MacroBuilder &Builder,
61                                     StringRef File,
62                                     FileManager &FileMgr) {
63  Builder.append(Twine("#__include_macros \"") +
64                 HeaderSearch::NormalizeDashIncludePath(File, FileMgr) + "\"");
65  // Marker token to stop the __include_macros fetch loop.
66  Builder.append("##"); // ##?
67}
68
69/// AddImplicitIncludePTH - Add an implicit \#include using the original file
70/// used to generate a PTH cache.
71static void AddImplicitIncludePTH(MacroBuilder &Builder, Preprocessor &PP,
72                                  StringRef ImplicitIncludePTH) {
73  PTHManager *P = PP.getPTHManager();
74  // Null check 'P' in the corner case where it couldn't be created.
75  const char *OriginalFile = P ? P->getOriginalSourceFile() : 0;
76
77  if (!OriginalFile) {
78    PP.getDiagnostics().Report(diag::err_fe_pth_file_has_no_source_header)
79      << ImplicitIncludePTH;
80    return;
81  }
82
83  AddImplicitInclude(Builder, OriginalFile, PP.getFileManager());
84}
85
86/// PickFP - This is used to pick a value based on the FP semantics of the
87/// specified FP model.
88template <typename T>
89static T PickFP(const llvm::fltSemantics *Sem, T IEEESingleVal,
90                T IEEEDoubleVal, T X87DoubleExtendedVal, T PPCDoubleDoubleVal,
91                T IEEEQuadVal) {
92  if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEsingle)
93    return IEEESingleVal;
94  if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEdouble)
95    return IEEEDoubleVal;
96  if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::x87DoubleExtended)
97    return X87DoubleExtendedVal;
98  if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::PPCDoubleDouble)
99    return PPCDoubleDoubleVal;
100  assert(Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEquad);
101  return IEEEQuadVal;
102}
103
104static void DefineFloatMacros(MacroBuilder &Builder, StringRef Prefix,
105                              const llvm::fltSemantics *Sem) {
106  const char *DenormMin, *Epsilon, *Max, *Min;
107  DenormMin = PickFP(Sem, "1.40129846e-45F", "4.9406564584124654e-324",
108                     "3.64519953188247460253e-4951L",
109                     "4.94065645841246544176568792868221e-324L",
110                     "6.47517511943802511092443895822764655e-4966L");
111  int Digits = PickFP(Sem, 6, 15, 18, 31, 33);
112  Epsilon = PickFP(Sem, "1.19209290e-7F", "2.2204460492503131e-16",
113                   "1.08420217248550443401e-19L",
114                   "4.94065645841246544176568792868221e-324L",
115                   "1.92592994438723585305597794258492732e-34L");
116  int MantissaDigits = PickFP(Sem, 24, 53, 64, 106, 113);
117  int Min10Exp = PickFP(Sem, -37, -307, -4931, -291, -4931);
118  int Max10Exp = PickFP(Sem, 38, 308, 4932, 308, 4932);
119  int MinExp = PickFP(Sem, -125, -1021, -16381, -968, -16381);
120  int MaxExp = PickFP(Sem, 128, 1024, 16384, 1024, 16384);
121  Min = PickFP(Sem, "1.17549435e-38F", "2.2250738585072014e-308",
122               "3.36210314311209350626e-4932L",
123               "2.00416836000897277799610805135016e-292L",
124               "3.36210314311209350626267781732175260e-4932L");
125  Max = PickFP(Sem, "3.40282347e+38F", "1.7976931348623157e+308",
126               "1.18973149535723176502e+4932L",
127               "1.79769313486231580793728971405301e+308L",
128               "1.18973149535723176508575932662800702e+4932L");
129
130  SmallString<32> DefPrefix;
131  DefPrefix = "__";
132  DefPrefix += Prefix;
133  DefPrefix += "_";
134
135  Builder.defineMacro(DefPrefix + "DENORM_MIN__", DenormMin);
136  Builder.defineMacro(DefPrefix + "HAS_DENORM__");
137  Builder.defineMacro(DefPrefix + "DIG__", Twine(Digits));
138  Builder.defineMacro(DefPrefix + "EPSILON__", Twine(Epsilon));
139  Builder.defineMacro(DefPrefix + "HAS_INFINITY__");
140  Builder.defineMacro(DefPrefix + "HAS_QUIET_NAN__");
141  Builder.defineMacro(DefPrefix + "MANT_DIG__", Twine(MantissaDigits));
142
143  Builder.defineMacro(DefPrefix + "MAX_10_EXP__", Twine(Max10Exp));
144  Builder.defineMacro(DefPrefix + "MAX_EXP__", Twine(MaxExp));
145  Builder.defineMacro(DefPrefix + "MAX__", Twine(Max));
146
147  Builder.defineMacro(DefPrefix + "MIN_10_EXP__","("+Twine(Min10Exp)+")");
148  Builder.defineMacro(DefPrefix + "MIN_EXP__", "("+Twine(MinExp)+")");
149  Builder.defineMacro(DefPrefix + "MIN__", Twine(Min));
150}
151
152
153/// DefineTypeSize - Emit a macro to the predefines buffer that declares a macro
154/// named MacroName with the max value for a type with width 'TypeWidth' a
155/// signedness of 'isSigned' and with a value suffix of 'ValSuffix' (e.g. LL).
156static void DefineTypeSize(StringRef MacroName, unsigned TypeWidth,
157                           StringRef ValSuffix, bool isSigned,
158                           MacroBuilder &Builder) {
159  llvm::APInt MaxVal = isSigned ? llvm::APInt::getSignedMaxValue(TypeWidth)
160                                : llvm::APInt::getMaxValue(TypeWidth);
161  Builder.defineMacro(MacroName, MaxVal.toString(10, isSigned) + ValSuffix);
162}
163
164/// DefineTypeSize - An overloaded helper that uses TargetInfo to determine
165/// the width, suffix, and signedness of the given type
166static void DefineTypeSize(StringRef MacroName, TargetInfo::IntType Ty,
167                           const TargetInfo &TI, MacroBuilder &Builder) {
168  DefineTypeSize(MacroName, TI.getTypeWidth(Ty), TI.getTypeConstantSuffix(Ty),
169                 TI.isTypeSigned(Ty), Builder);
170}
171
172static void DefineType(const Twine &MacroName, TargetInfo::IntType Ty,
173                       MacroBuilder &Builder) {
174  Builder.defineMacro(MacroName, TargetInfo::getTypeName(Ty));
175}
176
177static void DefineTypeWidth(StringRef MacroName, TargetInfo::IntType Ty,
178                            const TargetInfo &TI, MacroBuilder &Builder) {
179  Builder.defineMacro(MacroName, Twine(TI.getTypeWidth(Ty)));
180}
181
182static void DefineTypeSizeof(StringRef MacroName, unsigned BitWidth,
183                             const TargetInfo &TI, MacroBuilder &Builder) {
184  Builder.defineMacro(MacroName,
185                      Twine(BitWidth / TI.getCharWidth()));
186}
187
188static void DefineExactWidthIntType(TargetInfo::IntType Ty,
189                               const TargetInfo &TI, MacroBuilder &Builder) {
190  int TypeWidth = TI.getTypeWidth(Ty);
191
192  // Use the target specified int64 type, when appropriate, so that [u]int64_t
193  // ends up being defined in terms of the correct type.
194  if (TypeWidth == 64)
195    Ty = TI.getInt64Type();
196
197  DefineType("__INT" + Twine(TypeWidth) + "_TYPE__", Ty, Builder);
198
199  StringRef ConstSuffix(TargetInfo::getTypeConstantSuffix(Ty));
200  if (!ConstSuffix.empty())
201    Builder.defineMacro("__INT" + Twine(TypeWidth) + "_C_SUFFIX__",
202                        ConstSuffix);
203}
204
205/// Get the value the ATOMIC_*_LOCK_FREE macro should have for a type with
206/// the specified properties.
207static const char *getLockFreeValue(unsigned TypeWidth, unsigned TypeAlign,
208                                    unsigned InlineWidth) {
209  // Fully-aligned, power-of-2 sizes no larger than the inline
210  // width will be inlined as lock-free operations.
211  if (TypeWidth == TypeAlign && (TypeWidth & (TypeWidth - 1)) == 0 &&
212      TypeWidth <= InlineWidth)
213    return "2"; // "always lock free"
214  // We cannot be certain what operations the lib calls might be
215  // able to implement as lock-free on future processors.
216  return "1"; // "sometimes lock free"
217}
218
219/// \brief Add definitions required for a smooth interaction between
220/// Objective-C++ automated reference counting and libstdc++ (4.2).
221static void AddObjCXXARCLibstdcxxDefines(const LangOptions &LangOpts,
222                                         MacroBuilder &Builder) {
223  Builder.defineMacro("_GLIBCXX_PREDEFINED_OBJC_ARC_IS_SCALAR");
224
225  std::string Result;
226  {
227    // Provide specializations for the __is_scalar type trait so that
228    // lifetime-qualified objects are not considered "scalar" types, which
229    // libstdc++ uses as an indicator of the presence of trivial copy, assign,
230    // default-construct, and destruct semantics (none of which hold for
231    // lifetime-qualified objects in ARC).
232    llvm::raw_string_ostream Out(Result);
233
234    Out << "namespace std {\n"
235        << "\n"
236        << "struct __true_type;\n"
237        << "struct __false_type;\n"
238        << "\n";
239
240    Out << "template<typename _Tp> struct __is_scalar;\n"
241        << "\n";
242
243    Out << "template<typename _Tp>\n"
244        << "struct __is_scalar<__attribute__((objc_ownership(strong))) _Tp> {\n"
245        << "  enum { __value = 0 };\n"
246        << "  typedef __false_type __type;\n"
247        << "};\n"
248        << "\n";
249
250    if (LangOpts.ObjCRuntimeHasWeak) {
251      Out << "template<typename _Tp>\n"
252          << "struct __is_scalar<__attribute__((objc_ownership(weak))) _Tp> {\n"
253          << "  enum { __value = 0 };\n"
254          << "  typedef __false_type __type;\n"
255          << "};\n"
256          << "\n";
257    }
258
259    Out << "template<typename _Tp>\n"
260        << "struct __is_scalar<__attribute__((objc_ownership(autoreleasing)))"
261        << " _Tp> {\n"
262        << "  enum { __value = 0 };\n"
263        << "  typedef __false_type __type;\n"
264        << "};\n"
265        << "\n";
266
267    Out << "}\n";
268  }
269  Builder.append(Result);
270}
271
272static void InitializeStandardPredefinedMacros(const TargetInfo &TI,
273                                               const LangOptions &LangOpts,
274                                               const FrontendOptions &FEOpts,
275                                               MacroBuilder &Builder) {
276  if (!LangOpts.MicrosoftMode && !LangOpts.TraditionalCPP)
277    Builder.defineMacro("__STDC__");
278  if (LangOpts.Freestanding)
279    Builder.defineMacro("__STDC_HOSTED__", "0");
280  else
281    Builder.defineMacro("__STDC_HOSTED__");
282
283  if (!LangOpts.CPlusPlus) {
284    if (LangOpts.C11)
285      Builder.defineMacro("__STDC_VERSION__", "201112L");
286    else if (LangOpts.C99)
287      Builder.defineMacro("__STDC_VERSION__", "199901L");
288    else if (!LangOpts.GNUMode && LangOpts.Digraphs)
289      Builder.defineMacro("__STDC_VERSION__", "199409L");
290  } else {
291    // C++11 [cpp.predefined]p1:
292    //   The name __cplusplus is defined to the value 201103L when compiling a
293    //   C++ translation unit.
294    if (LangOpts.CPlusPlus0x)
295      Builder.defineMacro("__cplusplus", "201103L");
296    // C++03 [cpp.predefined]p1:
297    //   The name __cplusplus is defined to the value 199711L when compiling a
298    //   C++ translation unit.
299    else
300      Builder.defineMacro("__cplusplus", "199711L");
301  }
302
303  if (LangOpts.ObjC1)
304    Builder.defineMacro("__OBJC__");
305
306  // Not "standard" per se, but available even with the -undef flag.
307  if (LangOpts.AsmPreprocessor)
308    Builder.defineMacro("__ASSEMBLER__");
309}
310
311static void InitializePredefinedMacros(const TargetInfo &TI,
312                                       const LangOptions &LangOpts,
313                                       const FrontendOptions &FEOpts,
314                                       MacroBuilder &Builder) {
315  // Compiler version introspection macros.
316  Builder.defineMacro("__llvm__");  // LLVM Backend
317  Builder.defineMacro("__clang__"); // Clang Frontend
318#define TOSTR2(X) #X
319#define TOSTR(X) TOSTR2(X)
320  Builder.defineMacro("__clang_major__", TOSTR(CLANG_VERSION_MAJOR));
321  Builder.defineMacro("__clang_minor__", TOSTR(CLANG_VERSION_MINOR));
322#ifdef CLANG_VERSION_PATCHLEVEL
323  Builder.defineMacro("__clang_patchlevel__", TOSTR(CLANG_VERSION_PATCHLEVEL));
324#else
325  Builder.defineMacro("__clang_patchlevel__", "0");
326#endif
327  Builder.defineMacro("__clang_version__",
328                      "\"" CLANG_VERSION_STRING " ("
329                      + getClangFullRepositoryVersion() + ")\"");
330#undef TOSTR
331#undef TOSTR2
332  if (!LangOpts.MicrosoftMode) {
333    // Currently claim to be compatible with GCC 4.2.1-5621, but only if we're
334    // not compiling for MSVC compatibility
335    Builder.defineMacro("__GNUC_MINOR__", "2");
336    Builder.defineMacro("__GNUC_PATCHLEVEL__", "1");
337    Builder.defineMacro("__GNUC__", "4");
338    Builder.defineMacro("__GXX_ABI_VERSION", "1002");
339  }
340
341  // Define macros for the C11 / C++11 memory orderings
342  Builder.defineMacro("__ATOMIC_RELAXED", "0");
343  Builder.defineMacro("__ATOMIC_CONSUME", "1");
344  Builder.defineMacro("__ATOMIC_ACQUIRE", "2");
345  Builder.defineMacro("__ATOMIC_RELEASE", "3");
346  Builder.defineMacro("__ATOMIC_ACQ_REL", "4");
347  Builder.defineMacro("__ATOMIC_SEQ_CST", "5");
348
349  // Support for #pragma redefine_extname (Sun compatibility)
350  Builder.defineMacro("__PRAGMA_REDEFINE_EXTNAME", "1");
351
352  // As sad as it is, enough software depends on the __VERSION__ for version
353  // checks that it is necessary to report 4.2.1 (the base GCC version we claim
354  // compatibility with) first.
355  Builder.defineMacro("__VERSION__", "\"4.2.1 Compatible " +
356                      Twine(getClangFullCPPVersion()) + "\"");
357
358  // Initialize language-specific preprocessor defines.
359
360  // Standard conforming mode?
361  if (!LangOpts.GNUMode)
362    Builder.defineMacro("__STRICT_ANSI__");
363
364  if (LangOpts.CPlusPlus0x)
365    Builder.defineMacro("__GXX_EXPERIMENTAL_CXX0X__");
366
367  if (LangOpts.ObjC1) {
368    if (LangOpts.ObjCNonFragileABI) {
369      Builder.defineMacro("__OBJC2__");
370
371      if (LangOpts.ObjCExceptions)
372        Builder.defineMacro("OBJC_ZEROCOST_EXCEPTIONS");
373    }
374
375    if (LangOpts.getGC() != LangOptions::NonGC)
376      Builder.defineMacro("__OBJC_GC__");
377
378    if (LangOpts.NeXTRuntime)
379      Builder.defineMacro("__NEXT_RUNTIME__");
380  }
381
382  // darwin_constant_cfstrings controls this. This is also dependent
383  // on other things like the runtime I believe.  This is set even for C code.
384  if (!LangOpts.NoConstantCFStrings)
385      Builder.defineMacro("__CONSTANT_CFSTRINGS__");
386
387  if (LangOpts.ObjC2)
388    Builder.defineMacro("OBJC_NEW_PROPERTIES");
389
390  if (LangOpts.PascalStrings)
391    Builder.defineMacro("__PASCAL_STRINGS__");
392
393  if (LangOpts.Blocks) {
394    Builder.defineMacro("__block", "__attribute__((__blocks__(byref)))");
395    Builder.defineMacro("__BLOCKS__");
396  }
397
398  if (LangOpts.CXXExceptions)
399    Builder.defineMacro("__EXCEPTIONS");
400  if (LangOpts.RTTI)
401    Builder.defineMacro("__GXX_RTTI");
402  if (LangOpts.SjLjExceptions)
403    Builder.defineMacro("__USING_SJLJ_EXCEPTIONS__");
404
405  if (LangOpts.Deprecated)
406    Builder.defineMacro("__DEPRECATED");
407
408  if (LangOpts.CPlusPlus) {
409    Builder.defineMacro("__GNUG__", "4");
410    Builder.defineMacro("__GXX_WEAK__");
411    Builder.defineMacro("__private_extern__", "extern");
412  }
413
414  if (LangOpts.MicrosoftExt) {
415    // Both __PRETTY_FUNCTION__ and __FUNCTION__ are GCC extensions, however
416    // VC++ appears to only like __FUNCTION__.
417    Builder.defineMacro("__PRETTY_FUNCTION__", "__FUNCTION__");
418    // Work around some issues with Visual C++ headerws.
419    if (LangOpts.CPlusPlus) {
420      // Since we define wchar_t in C++ mode.
421      Builder.defineMacro("_WCHAR_T_DEFINED");
422      Builder.defineMacro("_NATIVE_WCHAR_T_DEFINED");
423      // FIXME: Support Microsoft's __identifier extension in the lexer.
424      Builder.append("#define __identifier(x) x");
425      Builder.append("class type_info;");
426    }
427
428    if (LangOpts.CPlusPlus0x) {
429      Builder.defineMacro("_HAS_CHAR16_T_LANGUAGE_SUPPORT", "1");
430    }
431  }
432
433  if (LangOpts.Optimize)
434    Builder.defineMacro("__OPTIMIZE__");
435  if (LangOpts.OptimizeSize)
436    Builder.defineMacro("__OPTIMIZE_SIZE__");
437
438  if (LangOpts.FastMath)
439    Builder.defineMacro("__FAST_MATH__");
440
441  // Initialize target-specific preprocessor defines.
442
443  // Define type sizing macros based on the target properties.
444  assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far");
445  Builder.defineMacro("__CHAR_BIT__", "8");
446
447  DefineTypeSize("__SCHAR_MAX__", TI.getCharWidth(), "", true, Builder);
448  DefineTypeSize("__SHRT_MAX__", TargetInfo::SignedShort, TI, Builder);
449  DefineTypeSize("__INT_MAX__", TargetInfo::SignedInt, TI, Builder);
450  DefineTypeSize("__LONG_MAX__", TargetInfo::SignedLong, TI, Builder);
451  DefineTypeSize("__LONG_LONG_MAX__", TargetInfo::SignedLongLong, TI, Builder);
452  DefineTypeSize("__WCHAR_MAX__", TI.getWCharType(), TI, Builder);
453  DefineTypeSize("__INTMAX_MAX__", TI.getIntMaxType(), TI, Builder);
454
455  DefineTypeSizeof("__SIZEOF_DOUBLE__", TI.getDoubleWidth(), TI, Builder);
456  DefineTypeSizeof("__SIZEOF_FLOAT__", TI.getFloatWidth(), TI, Builder);
457  DefineTypeSizeof("__SIZEOF_INT__", TI.getIntWidth(), TI, Builder);
458  DefineTypeSizeof("__SIZEOF_LONG__", TI.getLongWidth(), TI, Builder);
459  DefineTypeSizeof("__SIZEOF_LONG_DOUBLE__",TI.getLongDoubleWidth(),TI,Builder);
460  DefineTypeSizeof("__SIZEOF_LONG_LONG__", TI.getLongLongWidth(), TI, Builder);
461  DefineTypeSizeof("__SIZEOF_POINTER__", TI.getPointerWidth(0), TI, Builder);
462  DefineTypeSizeof("__SIZEOF_SHORT__", TI.getShortWidth(), TI, Builder);
463  DefineTypeSizeof("__SIZEOF_PTRDIFF_T__",
464                   TI.getTypeWidth(TI.getPtrDiffType(0)), TI, Builder);
465  DefineTypeSizeof("__SIZEOF_SIZE_T__",
466                   TI.getTypeWidth(TI.getSizeType()), TI, Builder);
467  DefineTypeSizeof("__SIZEOF_WCHAR_T__",
468                   TI.getTypeWidth(TI.getWCharType()), TI, Builder);
469  DefineTypeSizeof("__SIZEOF_WINT_T__",
470                   TI.getTypeWidth(TI.getWIntType()), TI, Builder);
471
472  DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Builder);
473  DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Builder);
474  DefineTypeWidth("__INTMAX_WIDTH__",  TI.getIntMaxType(), TI, Builder);
475  DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Builder);
476  DefineTypeWidth("__PTRDIFF_WIDTH__", TI.getPtrDiffType(0), TI, Builder);
477  DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Builder);
478  DefineTypeWidth("__INTPTR_WIDTH__", TI.getIntPtrType(), TI, Builder);
479  DefineType("__SIZE_TYPE__", TI.getSizeType(), Builder);
480  DefineTypeWidth("__SIZE_WIDTH__", TI.getSizeType(), TI, Builder);
481  DefineType("__WCHAR_TYPE__", TI.getWCharType(), Builder);
482  DefineTypeWidth("__WCHAR_WIDTH__", TI.getWCharType(), TI, Builder);
483  DefineType("__WINT_TYPE__", TI.getWIntType(), Builder);
484  DefineTypeWidth("__WINT_WIDTH__", TI.getWIntType(), TI, Builder);
485  DefineTypeWidth("__SIG_ATOMIC_WIDTH__", TI.getSigAtomicType(), TI, Builder);
486  DefineType("__CHAR16_TYPE__", TI.getChar16Type(), Builder);
487  DefineType("__CHAR32_TYPE__", TI.getChar32Type(), Builder);
488
489  DefineFloatMacros(Builder, "FLT", &TI.getFloatFormat());
490  DefineFloatMacros(Builder, "DBL", &TI.getDoubleFormat());
491  DefineFloatMacros(Builder, "LDBL", &TI.getLongDoubleFormat());
492
493  // Define a __POINTER_WIDTH__ macro for stdint.h.
494  Builder.defineMacro("__POINTER_WIDTH__",
495                      Twine((int)TI.getPointerWidth(0)));
496
497  if (!LangOpts.CharIsSigned)
498    Builder.defineMacro("__CHAR_UNSIGNED__");
499
500  if (!TargetInfo::isTypeSigned(TI.getWCharType()))
501    Builder.defineMacro("__WCHAR_UNSIGNED__");
502
503  if (!TargetInfo::isTypeSigned(TI.getWIntType()))
504    Builder.defineMacro("__WINT_UNSIGNED__");
505
506  // Define exact-width integer types for stdint.h
507  Builder.defineMacro("__INT" + Twine(TI.getCharWidth()) + "_TYPE__",
508                      "char");
509
510  if (TI.getShortWidth() > TI.getCharWidth())
511    DefineExactWidthIntType(TargetInfo::SignedShort, TI, Builder);
512
513  if (TI.getIntWidth() > TI.getShortWidth())
514    DefineExactWidthIntType(TargetInfo::SignedInt, TI, Builder);
515
516  if (TI.getLongWidth() > TI.getIntWidth())
517    DefineExactWidthIntType(TargetInfo::SignedLong, TI, Builder);
518
519  if (TI.getLongLongWidth() > TI.getLongWidth())
520    DefineExactWidthIntType(TargetInfo::SignedLongLong, TI, Builder);
521
522  // Add __builtin_va_list typedef.
523  Builder.append(TI.getVAListDeclaration());
524
525  if (const char *Prefix = TI.getUserLabelPrefix())
526    Builder.defineMacro("__USER_LABEL_PREFIX__", Prefix);
527
528  // Build configuration options.  FIXME: these should be controlled by
529  // command line options or something.
530  Builder.defineMacro("__FINITE_MATH_ONLY__", "0");
531
532  if (LangOpts.GNUInline)
533    Builder.defineMacro("__GNUC_GNU_INLINE__");
534  else
535    Builder.defineMacro("__GNUC_STDC_INLINE__");
536
537  // The value written by __atomic_test_and_set.
538  // FIXME: This is target-dependent.
539  Builder.defineMacro("__GCC_ATOMIC_TEST_AND_SET_TRUEVAL", "1");
540
541  // Used by libstdc++ to implement ATOMIC_<foo>_LOCK_FREE.
542  unsigned InlineWidthBits = TI.getMaxAtomicInlineWidth();
543#define DEFINE_LOCK_FREE_MACRO(TYPE, Type) \
544  Builder.defineMacro("__GCC_ATOMIC_" #TYPE "_LOCK_FREE", \
545                      getLockFreeValue(TI.get##Type##Width(), \
546                                       TI.get##Type##Align(), \
547                                       InlineWidthBits));
548  DEFINE_LOCK_FREE_MACRO(BOOL, Bool);
549  DEFINE_LOCK_FREE_MACRO(CHAR, Char);
550  DEFINE_LOCK_FREE_MACRO(CHAR16_T, Char16);
551  DEFINE_LOCK_FREE_MACRO(CHAR32_T, Char32);
552  DEFINE_LOCK_FREE_MACRO(WCHAR_T, WChar);
553  DEFINE_LOCK_FREE_MACRO(SHORT, Short);
554  DEFINE_LOCK_FREE_MACRO(INT, Int);
555  DEFINE_LOCK_FREE_MACRO(LONG, Long);
556  DEFINE_LOCK_FREE_MACRO(LLONG, LongLong);
557  Builder.defineMacro("__GCC_ATOMIC_POINTER_LOCK_FREE",
558                      getLockFreeValue(TI.getPointerWidth(0),
559                                       TI.getPointerAlign(0),
560                                       InlineWidthBits));
561#undef DEFINE_LOCK_FREE_MACRO
562
563  if (LangOpts.NoInlineDefine)
564    Builder.defineMacro("__NO_INLINE__");
565
566  if (unsigned PICLevel = LangOpts.PICLevel) {
567    Builder.defineMacro("__PIC__", Twine(PICLevel));
568    Builder.defineMacro("__pic__", Twine(PICLevel));
569  }
570  if (unsigned PIELevel = LangOpts.PIELevel) {
571    Builder.defineMacro("__PIE__", Twine(PIELevel));
572    Builder.defineMacro("__pie__", Twine(PIELevel));
573  }
574
575  // Macros to control C99 numerics and <float.h>
576  Builder.defineMacro("__FLT_EVAL_METHOD__", Twine(TI.getFloatEvalMethod()));
577  Builder.defineMacro("__FLT_RADIX__", "2");
578  int Dig = PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33, 36);
579  Builder.defineMacro("__DECIMAL_DIG__", Twine(Dig));
580
581  if (LangOpts.getStackProtector() == LangOptions::SSPOn)
582    Builder.defineMacro("__SSP__");
583  else if (LangOpts.getStackProtector() == LangOptions::SSPReq)
584    Builder.defineMacro("__SSP_ALL__", "2");
585
586  if (FEOpts.ProgramAction == frontend::RewriteObjC)
587    Builder.defineMacro("__weak", "__attribute__((objc_gc(weak)))");
588
589  // Define a macro that exists only when using the static analyzer.
590  if (FEOpts.ProgramAction == frontend::RunAnalysis)
591    Builder.defineMacro("__clang_analyzer__");
592
593  if (LangOpts.FastRelaxedMath)
594    Builder.defineMacro("__FAST_RELAXED_MATH__");
595
596  if (LangOpts.ObjCAutoRefCount) {
597    Builder.defineMacro("__weak", "__attribute__((objc_ownership(weak)))");
598    Builder.defineMacro("__strong", "__attribute__((objc_ownership(strong)))");
599    Builder.defineMacro("__autoreleasing",
600                        "__attribute__((objc_ownership(autoreleasing)))");
601    Builder.defineMacro("__unsafe_unretained",
602                        "__attribute__((objc_ownership(none)))");
603  }
604
605  // Get other target #defines.
606  TI.getTargetDefines(LangOpts, Builder);
607}
608
609// Initialize the remapping of files to alternative contents, e.g.,
610// those specified through other files.
611static void InitializeFileRemapping(DiagnosticsEngine &Diags,
612                                    SourceManager &SourceMgr,
613                                    FileManager &FileMgr,
614                                    const PreprocessorOptions &InitOpts) {
615  // Remap files in the source manager (with buffers).
616  for (PreprocessorOptions::const_remapped_file_buffer_iterator
617         Remap = InitOpts.remapped_file_buffer_begin(),
618         RemapEnd = InitOpts.remapped_file_buffer_end();
619       Remap != RemapEnd;
620       ++Remap) {
621    // Create the file entry for the file that we're mapping from.
622    const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first,
623                                                Remap->second->getBufferSize(),
624                                                       0);
625    if (!FromFile) {
626      Diags.Report(diag::err_fe_remap_missing_from_file)
627        << Remap->first;
628      if (!InitOpts.RetainRemappedFileBuffers)
629        delete Remap->second;
630      continue;
631    }
632
633    // Override the contents of the "from" file with the contents of
634    // the "to" file.
635    SourceMgr.overrideFileContents(FromFile, Remap->second,
636                                   InitOpts.RetainRemappedFileBuffers);
637  }
638
639  // Remap files in the source manager (with other files).
640  for (PreprocessorOptions::const_remapped_file_iterator
641         Remap = InitOpts.remapped_file_begin(),
642         RemapEnd = InitOpts.remapped_file_end();
643       Remap != RemapEnd;
644       ++Remap) {
645    // Find the file that we're mapping to.
646    const FileEntry *ToFile = FileMgr.getFile(Remap->second);
647    if (!ToFile) {
648      Diags.Report(diag::err_fe_remap_missing_to_file)
649      << Remap->first << Remap->second;
650      continue;
651    }
652
653    // Create the file entry for the file that we're mapping from.
654    const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first,
655                                                       ToFile->getSize(), 0);
656    if (!FromFile) {
657      Diags.Report(diag::err_fe_remap_missing_from_file)
658      << Remap->first;
659      continue;
660    }
661
662    // Override the contents of the "from" file with the contents of
663    // the "to" file.
664    SourceMgr.overrideFileContents(FromFile, ToFile);
665  }
666
667  SourceMgr.setOverridenFilesKeepOriginalName(
668                                        InitOpts.RemappedFilesKeepOriginalName);
669}
670
671/// InitializePreprocessor - Initialize the preprocessor getting it and the
672/// environment ready to process a single file. This returns true on error.
673///
674void clang::InitializePreprocessor(Preprocessor &PP,
675                                   const PreprocessorOptions &InitOpts,
676                                   const HeaderSearchOptions &HSOpts,
677                                   const FrontendOptions &FEOpts) {
678  const LangOptions &LangOpts = PP.getLangOpts();
679  std::string PredefineBuffer;
680  PredefineBuffer.reserve(4080);
681  llvm::raw_string_ostream Predefines(PredefineBuffer);
682  MacroBuilder Builder(Predefines);
683
684  InitializeFileRemapping(PP.getDiagnostics(), PP.getSourceManager(),
685                          PP.getFileManager(), InitOpts);
686
687  // Emit line markers for various builtin sections of the file.  We don't do
688  // this in asm preprocessor mode, because "# 4" is not a line marker directive
689  // in this mode.
690  if (!PP.getLangOpts().AsmPreprocessor)
691    Builder.append("# 1 \"<built-in>\" 3");
692
693  // Install things like __POWERPC__, __GNUC__, etc into the macro table.
694  if (InitOpts.UsePredefines) {
695    InitializePredefinedMacros(PP.getTargetInfo(), LangOpts, FEOpts, Builder);
696
697    // Install definitions to make Objective-C++ ARC work well with various
698    // C++ Standard Library implementations.
699    if (LangOpts.ObjC1 && LangOpts.CPlusPlus && LangOpts.ObjCAutoRefCount) {
700      switch (InitOpts.ObjCXXARCStandardLibrary) {
701      case ARCXX_nolib:
702        case ARCXX_libcxx:
703        break;
704
705      case ARCXX_libstdcxx:
706        AddObjCXXARCLibstdcxxDefines(LangOpts, Builder);
707        break;
708      }
709    }
710  }
711
712  // Even with predefines off, some macros are still predefined.
713  // These should all be defined in the preprocessor according to the
714  // current language configuration.
715  InitializeStandardPredefinedMacros(PP.getTargetInfo(), PP.getLangOpts(),
716                                     FEOpts, Builder);
717
718  // Add on the predefines from the driver.  Wrap in a #line directive to report
719  // that they come from the command line.
720  if (!PP.getLangOpts().AsmPreprocessor)
721    Builder.append("# 1 \"<command line>\" 1");
722
723  // Process #define's and #undef's in the order they are given.
724  for (unsigned i = 0, e = InitOpts.Macros.size(); i != e; ++i) {
725    if (InitOpts.Macros[i].second)  // isUndef
726      Builder.undefineMacro(InitOpts.Macros[i].first);
727    else
728      DefineBuiltinMacro(Builder, InitOpts.Macros[i].first,
729                         PP.getDiagnostics());
730  }
731
732  // If -imacros are specified, include them now.  These are processed before
733  // any -include directives.
734  for (unsigned i = 0, e = InitOpts.MacroIncludes.size(); i != e; ++i)
735    AddImplicitIncludeMacros(Builder, InitOpts.MacroIncludes[i],
736                             PP.getFileManager());
737
738  // Process -include directives.
739  for (unsigned i = 0, e = InitOpts.Includes.size(); i != e; ++i) {
740    const std::string &Path = InitOpts.Includes[i];
741    if (Path == InitOpts.ImplicitPTHInclude)
742      AddImplicitIncludePTH(Builder, PP, Path);
743    else
744      AddImplicitInclude(Builder, Path, PP.getFileManager());
745  }
746
747  // Exit the command line and go back to <built-in> (2 is LC_LEAVE).
748  if (!PP.getLangOpts().AsmPreprocessor)
749    Builder.append("# 1 \"<built-in>\" 2");
750
751  // Instruct the preprocessor to skip the preamble.
752  PP.setSkipMainFilePreamble(InitOpts.PrecompiledPreambleBytes.first,
753                             InitOpts.PrecompiledPreambleBytes.second);
754
755  // Copy PredefinedBuffer into the Preprocessor.
756  PP.setPredefines(Predefines.str());
757
758  // Initialize the header search object.
759  ApplyHeaderSearchOptions(PP.getHeaderSearchInfo(), HSOpts,
760                           PP.getLangOpts(),
761                           PP.getTargetInfo().getTriple());
762}
763