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Diffstat (limited to 'clang/lib/Frontend/InitPreprocessor.cpp')
| -rw-r--r-- | clang/lib/Frontend/InitPreprocessor.cpp | 763 |
1 files changed, 763 insertions, 0 deletions
diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp new file mode 100644 index 0000000..93d49b0 --- /dev/null +++ b/clang/lib/Frontend/InitPreprocessor.cpp @@ -0,0 +1,763 @@ +//===--- InitPreprocessor.cpp - PP initialization code. ---------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements the clang::InitializePreprocessor function. +// +//===----------------------------------------------------------------------===// + +#include "clang/Basic/Version.h" +#include "clang/Frontend/Utils.h" +#include "clang/Basic/MacroBuilder.h" +#include "clang/Basic/TargetInfo.h" +#include "clang/Frontend/FrontendDiagnostic.h" +#include "clang/Frontend/FrontendOptions.h" +#include "clang/Frontend/PreprocessorOptions.h" +#include "clang/Lex/HeaderSearch.h" +#include "clang/Lex/Preprocessor.h" +#include "clang/Basic/FileManager.h" +#include "clang/Basic/SourceManager.h" +#include "llvm/ADT/APFloat.h" +#include "llvm/Support/FileSystem.h" +#include "llvm/Support/MemoryBuffer.h" +#include "llvm/Support/Path.h" +using namespace clang; + +// Append a #define line to Buf for Macro. Macro should be of the form XXX, +// in which case we emit "#define XXX 1" or "XXX=Y z W" in which case we emit +// "#define XXX Y z W". To get a #define with no value, use "XXX=". +static void DefineBuiltinMacro(MacroBuilder &Builder, StringRef Macro, + DiagnosticsEngine &Diags) { + std::pair<StringRef, StringRef> MacroPair = Macro.split('='); + StringRef MacroName = MacroPair.first; + StringRef MacroBody = MacroPair.second; + if (MacroName.size() != Macro.size()) { + // Per GCC -D semantics, the macro ends at \n if it exists. + StringRef::size_type End = MacroBody.find_first_of("\n\r"); + if (End != StringRef::npos) + Diags.Report(diag::warn_fe_macro_contains_embedded_newline) + << MacroName; + Builder.defineMacro(MacroName, MacroBody.substr(0, End)); + } else { + // Push "macroname 1". + Builder.defineMacro(Macro); + } +} + +/// AddImplicitInclude - Add an implicit #include of the specified file to the +/// predefines buffer. +static void AddImplicitInclude(MacroBuilder &Builder, StringRef File, + FileManager &FileMgr) { + Builder.append(Twine("#include \"") + + HeaderSearch::NormalizeDashIncludePath(File, FileMgr) + "\""); +} + +static void AddImplicitIncludeMacros(MacroBuilder &Builder, + StringRef File, + FileManager &FileMgr) { + Builder.append(Twine("#__include_macros \"") + + HeaderSearch::NormalizeDashIncludePath(File, FileMgr) + "\""); + // Marker token to stop the __include_macros fetch loop. + Builder.append("##"); // ##? +} + +/// AddImplicitIncludePTH - Add an implicit #include using the original file +/// used to generate a PTH cache. +static void AddImplicitIncludePTH(MacroBuilder &Builder, Preprocessor &PP, + StringRef ImplicitIncludePTH) { + PTHManager *P = PP.getPTHManager(); + // Null check 'P' in the corner case where it couldn't be created. + const char *OriginalFile = P ? P->getOriginalSourceFile() : 0; + + if (!OriginalFile) { + PP.getDiagnostics().Report(diag::err_fe_pth_file_has_no_source_header) + << ImplicitIncludePTH; + return; + } + + AddImplicitInclude(Builder, OriginalFile, PP.getFileManager()); +} + +/// PickFP - This is used to pick a value based on the FP semantics of the +/// specified FP model. +template <typename T> +static T PickFP(const llvm::fltSemantics *Sem, T IEEESingleVal, + T IEEEDoubleVal, T X87DoubleExtendedVal, T PPCDoubleDoubleVal, + T IEEEQuadVal) { + if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEsingle) + return IEEESingleVal; + if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEdouble) + return IEEEDoubleVal; + if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::x87DoubleExtended) + return X87DoubleExtendedVal; + if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::PPCDoubleDouble) + return PPCDoubleDoubleVal; + assert(Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEquad); + return IEEEQuadVal; +} + +static void DefineFloatMacros(MacroBuilder &Builder, StringRef Prefix, + const llvm::fltSemantics *Sem) { + const char *DenormMin, *Epsilon, *Max, *Min; + DenormMin = PickFP(Sem, "1.40129846e-45F", "4.9406564584124654e-324", + "3.64519953188247460253e-4951L", + "4.94065645841246544176568792868221e-324L", + "6.47517511943802511092443895822764655e-4966L"); + int Digits = PickFP(Sem, 6, 15, 18, 31, 33); + Epsilon = PickFP(Sem, "1.19209290e-7F", "2.2204460492503131e-16", + "1.08420217248550443401e-19L", + "4.94065645841246544176568792868221e-324L", + "1.92592994438723585305597794258492732e-34L"); + int MantissaDigits = PickFP(Sem, 24, 53, 64, 106, 113); + int Min10Exp = PickFP(Sem, -37, -307, -4931, -291, -4931); + int Max10Exp = PickFP(Sem, 38, 308, 4932, 308, 4932); + int MinExp = PickFP(Sem, -125, -1021, -16381, -968, -16381); + int MaxExp = PickFP(Sem, 128, 1024, 16384, 1024, 16384); + Min = PickFP(Sem, "1.17549435e-38F", "2.2250738585072014e-308", + "3.36210314311209350626e-4932L", + "2.00416836000897277799610805135016e-292L", + "3.36210314311209350626267781732175260e-4932L"); + Max = PickFP(Sem, "3.40282347e+38F", "1.7976931348623157e+308", + "1.18973149535723176502e+4932L", + "1.79769313486231580793728971405301e+308L", + "1.18973149535723176508575932662800702e+4932L"); + + SmallString<32> DefPrefix; + DefPrefix = "__"; + DefPrefix += Prefix; + DefPrefix += "_"; + + Builder.defineMacro(DefPrefix + "DENORM_MIN__", DenormMin); + Builder.defineMacro(DefPrefix + "HAS_DENORM__"); + Builder.defineMacro(DefPrefix + "DIG__", Twine(Digits)); + Builder.defineMacro(DefPrefix + "EPSILON__", Twine(Epsilon)); + Builder.defineMacro(DefPrefix + "HAS_INFINITY__"); + Builder.defineMacro(DefPrefix + "HAS_QUIET_NAN__"); + Builder.defineMacro(DefPrefix + "MANT_DIG__", Twine(MantissaDigits)); + + Builder.defineMacro(DefPrefix + "MAX_10_EXP__", Twine(Max10Exp)); + Builder.defineMacro(DefPrefix + "MAX_EXP__", Twine(MaxExp)); + Builder.defineMacro(DefPrefix + "MAX__", Twine(Max)); + + Builder.defineMacro(DefPrefix + "MIN_10_EXP__","("+Twine(Min10Exp)+")"); + Builder.defineMacro(DefPrefix + "MIN_EXP__", "("+Twine(MinExp)+")"); + Builder.defineMacro(DefPrefix + "MIN__", Twine(Min)); +} + + +/// DefineTypeSize - Emit a macro to the predefines buffer that declares a macro +/// named MacroName with the max value for a type with width 'TypeWidth' a +/// signedness of 'isSigned' and with a value suffix of 'ValSuffix' (e.g. LL). +static void DefineTypeSize(StringRef MacroName, unsigned TypeWidth, + StringRef ValSuffix, bool isSigned, + MacroBuilder &Builder) { + llvm::APInt MaxVal = isSigned ? llvm::APInt::getSignedMaxValue(TypeWidth) + : llvm::APInt::getMaxValue(TypeWidth); + Builder.defineMacro(MacroName, MaxVal.toString(10, isSigned) + ValSuffix); +} + +/// DefineTypeSize - An overloaded helper that uses TargetInfo to determine +/// the width, suffix, and signedness of the given type +static void DefineTypeSize(StringRef MacroName, TargetInfo::IntType Ty, + const TargetInfo &TI, MacroBuilder &Builder) { + DefineTypeSize(MacroName, TI.getTypeWidth(Ty), TI.getTypeConstantSuffix(Ty), + TI.isTypeSigned(Ty), Builder); +} + +static void DefineType(const Twine &MacroName, TargetInfo::IntType Ty, + MacroBuilder &Builder) { + Builder.defineMacro(MacroName, TargetInfo::getTypeName(Ty)); +} + +static void DefineTypeWidth(StringRef MacroName, TargetInfo::IntType Ty, + const TargetInfo &TI, MacroBuilder &Builder) { + Builder.defineMacro(MacroName, Twine(TI.getTypeWidth(Ty))); +} + +static void DefineTypeSizeof(StringRef MacroName, unsigned BitWidth, + const TargetInfo &TI, MacroBuilder &Builder) { + Builder.defineMacro(MacroName, + Twine(BitWidth / TI.getCharWidth())); +} + +static void DefineExactWidthIntType(TargetInfo::IntType Ty, + const TargetInfo &TI, MacroBuilder &Builder) { + int TypeWidth = TI.getTypeWidth(Ty); + + // Use the target specified int64 type, when appropriate, so that [u]int64_t + // ends up being defined in terms of the correct type. + if (TypeWidth == 64) + Ty = TI.getInt64Type(); + + DefineType("__INT" + Twine(TypeWidth) + "_TYPE__", Ty, Builder); + + StringRef ConstSuffix(TargetInfo::getTypeConstantSuffix(Ty)); + if (!ConstSuffix.empty()) + Builder.defineMacro("__INT" + Twine(TypeWidth) + "_C_SUFFIX__", + ConstSuffix); +} + +/// Get the value the ATOMIC_*_LOCK_FREE macro should have for a type with +/// the specified properties. +static const char *getLockFreeValue(unsigned TypeWidth, unsigned TypeAlign, + unsigned InlineWidth) { + // Fully-aligned, power-of-2 sizes no larger than the inline + // width will be inlined as lock-free operations. + if (TypeWidth == TypeAlign && (TypeWidth & (TypeWidth - 1)) == 0 && + TypeWidth <= InlineWidth) + return "2"; // "always lock free" + // We cannot be certain what operations the lib calls might be + // able to implement as lock-free on future processors. + return "1"; // "sometimes lock free" +} + +/// \brief Add definitions required for a smooth interaction between +/// Objective-C++ automated reference counting and libstdc++ (4.2). +static void AddObjCXXARCLibstdcxxDefines(const LangOptions &LangOpts, + MacroBuilder &Builder) { + Builder.defineMacro("_GLIBCXX_PREDEFINED_OBJC_ARC_IS_SCALAR"); + + std::string Result; + { + // Provide specializations for the __is_scalar type trait so that + // lifetime-qualified objects are not considered "scalar" types, which + // libstdc++ uses as an indicator of the presence of trivial copy, assign, + // default-construct, and destruct semantics (none of which hold for + // lifetime-qualified objects in ARC). + llvm::raw_string_ostream Out(Result); + + Out << "namespace std {\n" + << "\n" + << "struct __true_type;\n" + << "struct __false_type;\n" + << "\n"; + + Out << "template<typename _Tp> struct __is_scalar;\n" + << "\n"; + + Out << "template<typename _Tp>\n" + << "struct __is_scalar<__attribute__((objc_ownership(strong))) _Tp> {\n" + << " enum { __value = 0 };\n" + << " typedef __false_type __type;\n" + << "};\n" + << "\n"; + + if (LangOpts.ObjCRuntimeHasWeak) { + Out << "template<typename _Tp>\n" + << "struct __is_scalar<__attribute__((objc_ownership(weak))) _Tp> {\n" + << " enum { __value = 0 };\n" + << " typedef __false_type __type;\n" + << "};\n" + << "\n"; + } + + Out << "template<typename _Tp>\n" + << "struct __is_scalar<__attribute__((objc_ownership(autoreleasing)))" + << " _Tp> {\n" + << " enum { __value = 0 };\n" + << " typedef __false_type __type;\n" + << "};\n" + << "\n"; + + Out << "}\n"; + } + Builder.append(Result); +} + +static void InitializeStandardPredefinedMacros(const TargetInfo &TI, + const LangOptions &LangOpts, + const FrontendOptions &FEOpts, + MacroBuilder &Builder) { + if (!LangOpts.MicrosoftMode && !LangOpts.TraditionalCPP) + Builder.defineMacro("__STDC__"); + if (LangOpts.Freestanding) + Builder.defineMacro("__STDC_HOSTED__", "0"); + else + Builder.defineMacro("__STDC_HOSTED__"); + + if (!LangOpts.CPlusPlus) { + if (LangOpts.C11) + Builder.defineMacro("__STDC_VERSION__", "201112L"); + else if (LangOpts.C99) + Builder.defineMacro("__STDC_VERSION__", "199901L"); + else if (!LangOpts.GNUMode && LangOpts.Digraphs) + Builder.defineMacro("__STDC_VERSION__", "199409L"); + } else { + if (LangOpts.GNUMode) + Builder.defineMacro("__cplusplus"); + else { + // C++0x [cpp.predefined]p1: + // The name_ _cplusplus is defined to the value 201103L when compiling a + // C++ translation unit. + if (LangOpts.CPlusPlus0x) + Builder.defineMacro("__cplusplus", "201103L"); + // C++03 [cpp.predefined]p1: + // The name_ _cplusplus is defined to the value 199711L when compiling a + // C++ translation unit. + else + Builder.defineMacro("__cplusplus", "199711L"); + } + } + + if (LangOpts.ObjC1) + Builder.defineMacro("__OBJC__"); + + // Not "standard" per se, but available even with the -undef flag. + if (LangOpts.AsmPreprocessor) + Builder.defineMacro("__ASSEMBLER__"); +} + +static void InitializePredefinedMacros(const TargetInfo &TI, + const LangOptions &LangOpts, + const FrontendOptions &FEOpts, + MacroBuilder &Builder) { + // Compiler version introspection macros. + Builder.defineMacro("__llvm__"); // LLVM Backend + Builder.defineMacro("__clang__"); // Clang Frontend +#define TOSTR2(X) #X +#define TOSTR(X) TOSTR2(X) + Builder.defineMacro("__clang_major__", TOSTR(CLANG_VERSION_MAJOR)); + Builder.defineMacro("__clang_minor__", TOSTR(CLANG_VERSION_MINOR)); +#ifdef CLANG_VERSION_PATCHLEVEL + Builder.defineMacro("__clang_patchlevel__", TOSTR(CLANG_VERSION_PATCHLEVEL)); +#else + Builder.defineMacro("__clang_patchlevel__", "0"); +#endif + Builder.defineMacro("__clang_version__", + "\"" CLANG_VERSION_STRING " (" + + getClangFullRepositoryVersion() + ")\""); +#undef TOSTR +#undef TOSTR2 + if (!LangOpts.MicrosoftMode) { + // Currently claim to be compatible with GCC 4.2.1-5621, but only if we're + // not compiling for MSVC compatibility + Builder.defineMacro("__GNUC_MINOR__", "2"); + Builder.defineMacro("__GNUC_PATCHLEVEL__", "1"); + Builder.defineMacro("__GNUC__", "4"); + Builder.defineMacro("__GXX_ABI_VERSION", "1002"); + } + + // Define macros for the C11 / C++11 memory orderings + Builder.defineMacro("__ATOMIC_RELAXED", "0"); + Builder.defineMacro("__ATOMIC_CONSUME", "1"); + Builder.defineMacro("__ATOMIC_ACQUIRE", "2"); + Builder.defineMacro("__ATOMIC_RELEASE", "3"); + Builder.defineMacro("__ATOMIC_ACQ_REL", "4"); + Builder.defineMacro("__ATOMIC_SEQ_CST", "5"); + + // Support for #pragma redefine_extname (Sun compatibility) + Builder.defineMacro("__PRAGMA_REDEFINE_EXTNAME", "1"); + + // As sad as it is, enough software depends on the __VERSION__ for version + // checks that it is necessary to report 4.2.1 (the base GCC version we claim + // compatibility with) first. + Builder.defineMacro("__VERSION__", "\"4.2.1 Compatible " + + Twine(getClangFullCPPVersion()) + "\""); + + // Initialize language-specific preprocessor defines. + + // Standard conforming mode? + if (!LangOpts.GNUMode) + Builder.defineMacro("__STRICT_ANSI__"); + + if (LangOpts.CPlusPlus0x) + Builder.defineMacro("__GXX_EXPERIMENTAL_CXX0X__"); + + if (LangOpts.ObjC1) { + if (LangOpts.ObjCNonFragileABI) { + Builder.defineMacro("__OBJC2__"); + + if (LangOpts.ObjCExceptions) + Builder.defineMacro("OBJC_ZEROCOST_EXCEPTIONS"); + } + + if (LangOpts.getGC() != LangOptions::NonGC) + Builder.defineMacro("__OBJC_GC__"); + + if (LangOpts.NeXTRuntime) + Builder.defineMacro("__NEXT_RUNTIME__"); + } + + // darwin_constant_cfstrings controls this. This is also dependent + // on other things like the runtime I believe. This is set even for C code. + if (!LangOpts.NoConstantCFStrings) + Builder.defineMacro("__CONSTANT_CFSTRINGS__"); + + if (LangOpts.ObjC2) + Builder.defineMacro("OBJC_NEW_PROPERTIES"); + + if (LangOpts.PascalStrings) + Builder.defineMacro("__PASCAL_STRINGS__"); + + if (LangOpts.Blocks) { + Builder.defineMacro("__block", "__attribute__((__blocks__(byref)))"); + Builder.defineMacro("__BLOCKS__"); + } + + if (LangOpts.CXXExceptions) + Builder.defineMacro("__EXCEPTIONS"); + if (LangOpts.RTTI) + Builder.defineMacro("__GXX_RTTI"); + if (LangOpts.SjLjExceptions) + Builder.defineMacro("__USING_SJLJ_EXCEPTIONS__"); + + if (LangOpts.Deprecated) + Builder.defineMacro("__DEPRECATED"); + + if (LangOpts.CPlusPlus) { + Builder.defineMacro("__GNUG__", "4"); + Builder.defineMacro("__GXX_WEAK__"); + Builder.defineMacro("__private_extern__", "extern"); + } + + if (LangOpts.MicrosoftExt) { + // Both __PRETTY_FUNCTION__ and __FUNCTION__ are GCC extensions, however + // VC++ appears to only like __FUNCTION__. + Builder.defineMacro("__PRETTY_FUNCTION__", "__FUNCTION__"); + // Work around some issues with Visual C++ headerws. + if (LangOpts.CPlusPlus) { + // Since we define wchar_t in C++ mode. + Builder.defineMacro("_WCHAR_T_DEFINED"); + Builder.defineMacro("_NATIVE_WCHAR_T_DEFINED"); + // FIXME: Support Microsoft's __identifier extension in the lexer. + Builder.append("#define __identifier(x) x"); + Builder.append("class type_info;"); + } + + if (LangOpts.CPlusPlus0x) { + Builder.defineMacro("_HAS_CHAR16_T_LANGUAGE_SUPPORT", "1"); + } + } + + if (LangOpts.Optimize) + Builder.defineMacro("__OPTIMIZE__"); + if (LangOpts.OptimizeSize) + Builder.defineMacro("__OPTIMIZE_SIZE__"); + + if (LangOpts.FastMath) + Builder.defineMacro("__FAST_MATH__"); + + // Initialize target-specific preprocessor defines. + + // Define type sizing macros based on the target properties. + assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far"); + Builder.defineMacro("__CHAR_BIT__", "8"); + + DefineTypeSize("__SCHAR_MAX__", TI.getCharWidth(), "", true, Builder); + DefineTypeSize("__SHRT_MAX__", TargetInfo::SignedShort, TI, Builder); + DefineTypeSize("__INT_MAX__", TargetInfo::SignedInt, TI, Builder); + DefineTypeSize("__LONG_MAX__", TargetInfo::SignedLong, TI, Builder); + DefineTypeSize("__LONG_LONG_MAX__", TargetInfo::SignedLongLong, TI, Builder); + DefineTypeSize("__WCHAR_MAX__", TI.getWCharType(), TI, Builder); + DefineTypeSize("__INTMAX_MAX__", TI.getIntMaxType(), TI, Builder); + + DefineTypeSizeof("__SIZEOF_DOUBLE__", TI.getDoubleWidth(), TI, Builder); + DefineTypeSizeof("__SIZEOF_FLOAT__", TI.getFloatWidth(), TI, Builder); + DefineTypeSizeof("__SIZEOF_INT__", TI.getIntWidth(), TI, Builder); + DefineTypeSizeof("__SIZEOF_LONG__", TI.getLongWidth(), TI, Builder); + DefineTypeSizeof("__SIZEOF_LONG_DOUBLE__",TI.getLongDoubleWidth(),TI,Builder); + DefineTypeSizeof("__SIZEOF_LONG_LONG__", TI.getLongLongWidth(), TI, Builder); + DefineTypeSizeof("__SIZEOF_POINTER__", TI.getPointerWidth(0), TI, Builder); + DefineTypeSizeof("__SIZEOF_SHORT__", TI.getShortWidth(), TI, Builder); + DefineTypeSizeof("__SIZEOF_PTRDIFF_T__", + TI.getTypeWidth(TI.getPtrDiffType(0)), TI, Builder); + DefineTypeSizeof("__SIZEOF_SIZE_T__", + TI.getTypeWidth(TI.getSizeType()), TI, Builder); + DefineTypeSizeof("__SIZEOF_WCHAR_T__", + TI.getTypeWidth(TI.getWCharType()), TI, Builder); + DefineTypeSizeof("__SIZEOF_WINT_T__", + TI.getTypeWidth(TI.getWIntType()), TI, Builder); + + DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Builder); + DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Builder); + DefineTypeWidth("__INTMAX_WIDTH__", TI.getIntMaxType(), TI, Builder); + DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Builder); + DefineTypeWidth("__PTRDIFF_WIDTH__", TI.getPtrDiffType(0), TI, Builder); + DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Builder); + DefineTypeWidth("__INTPTR_WIDTH__", TI.getIntPtrType(), TI, Builder); + DefineType("__SIZE_TYPE__", TI.getSizeType(), Builder); + DefineTypeWidth("__SIZE_WIDTH__", TI.getSizeType(), TI, Builder); + DefineType("__WCHAR_TYPE__", TI.getWCharType(), Builder); + DefineTypeWidth("__WCHAR_WIDTH__", TI.getWCharType(), TI, Builder); + DefineType("__WINT_TYPE__", TI.getWIntType(), Builder); + DefineTypeWidth("__WINT_WIDTH__", TI.getWIntType(), TI, Builder); + DefineTypeWidth("__SIG_ATOMIC_WIDTH__", TI.getSigAtomicType(), TI, Builder); + DefineType("__CHAR16_TYPE__", TI.getChar16Type(), Builder); + DefineType("__CHAR32_TYPE__", TI.getChar32Type(), Builder); + + DefineFloatMacros(Builder, "FLT", &TI.getFloatFormat()); + DefineFloatMacros(Builder, "DBL", &TI.getDoubleFormat()); + DefineFloatMacros(Builder, "LDBL", &TI.getLongDoubleFormat()); + + // Define a __POINTER_WIDTH__ macro for stdint.h. + Builder.defineMacro("__POINTER_WIDTH__", + Twine((int)TI.getPointerWidth(0))); + + if (!LangOpts.CharIsSigned) + Builder.defineMacro("__CHAR_UNSIGNED__"); + + if (!TargetInfo::isTypeSigned(TI.getWIntType())) + Builder.defineMacro("__WINT_UNSIGNED__"); + + // Define exact-width integer types for stdint.h + Builder.defineMacro("__INT" + Twine(TI.getCharWidth()) + "_TYPE__", + "char"); + + if (TI.getShortWidth() > TI.getCharWidth()) + DefineExactWidthIntType(TargetInfo::SignedShort, TI, Builder); + + if (TI.getIntWidth() > TI.getShortWidth()) + DefineExactWidthIntType(TargetInfo::SignedInt, TI, Builder); + + if (TI.getLongWidth() > TI.getIntWidth()) + DefineExactWidthIntType(TargetInfo::SignedLong, TI, Builder); + + if (TI.getLongLongWidth() > TI.getLongWidth()) + DefineExactWidthIntType(TargetInfo::SignedLongLong, TI, Builder); + + // Add __builtin_va_list typedef. + Builder.append(TI.getVAListDeclaration()); + + if (const char *Prefix = TI.getUserLabelPrefix()) + Builder.defineMacro("__USER_LABEL_PREFIX__", Prefix); + + // Build configuration options. FIXME: these should be controlled by + // command line options or something. + Builder.defineMacro("__FINITE_MATH_ONLY__", "0"); + + if (LangOpts.GNUInline) + Builder.defineMacro("__GNUC_GNU_INLINE__"); + else + Builder.defineMacro("__GNUC_STDC_INLINE__"); + + // The value written by __atomic_test_and_set. + // FIXME: This is target-dependent. + Builder.defineMacro("__GCC_ATOMIC_TEST_AND_SET_TRUEVAL", "1"); + + // Used by libstdc++ to implement ATOMIC_<foo>_LOCK_FREE. + unsigned InlineWidthBits = TI.getMaxAtomicInlineWidth(); +#define DEFINE_LOCK_FREE_MACRO(TYPE, Type) \ + Builder.defineMacro("__GCC_ATOMIC_" #TYPE "_LOCK_FREE", \ + getLockFreeValue(TI.get##Type##Width(), \ + TI.get##Type##Align(), \ + InlineWidthBits)); + DEFINE_LOCK_FREE_MACRO(BOOL, Bool); + DEFINE_LOCK_FREE_MACRO(CHAR, Char); + DEFINE_LOCK_FREE_MACRO(CHAR16_T, Char16); + DEFINE_LOCK_FREE_MACRO(CHAR32_T, Char32); + DEFINE_LOCK_FREE_MACRO(WCHAR_T, WChar); + DEFINE_LOCK_FREE_MACRO(SHORT, Short); + DEFINE_LOCK_FREE_MACRO(INT, Int); + DEFINE_LOCK_FREE_MACRO(LONG, Long); + DEFINE_LOCK_FREE_MACRO(LLONG, LongLong); + Builder.defineMacro("__GCC_ATOMIC_POINTER_LOCK_FREE", + getLockFreeValue(TI.getPointerWidth(0), + TI.getPointerAlign(0), + InlineWidthBits)); +#undef DEFINE_LOCK_FREE_MACRO + + if (LangOpts.NoInlineDefine) + Builder.defineMacro("__NO_INLINE__"); + + if (unsigned PICLevel = LangOpts.PICLevel) { + Builder.defineMacro("__PIC__", Twine(PICLevel)); + Builder.defineMacro("__pic__", Twine(PICLevel)); + } + if (unsigned PIELevel = LangOpts.PIELevel) { + Builder.defineMacro("__PIE__", Twine(PIELevel)); + Builder.defineMacro("__pie__", Twine(PIELevel)); + } + + // Macros to control C99 numerics and <float.h> + Builder.defineMacro("__FLT_EVAL_METHOD__", Twine(TI.getFloatEvalMethod())); + Builder.defineMacro("__FLT_RADIX__", "2"); + int Dig = PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33, 36); + Builder.defineMacro("__DECIMAL_DIG__", Twine(Dig)); + + if (LangOpts.getStackProtector() == LangOptions::SSPOn) + Builder.defineMacro("__SSP__"); + else if (LangOpts.getStackProtector() == LangOptions::SSPReq) + Builder.defineMacro("__SSP_ALL__", "2"); + + if (FEOpts.ProgramAction == frontend::RewriteObjC) + Builder.defineMacro("__weak", "__attribute__((objc_gc(weak)))"); + + // Define a macro that exists only when using the static analyzer. + if (FEOpts.ProgramAction == frontend::RunAnalysis) + Builder.defineMacro("__clang_analyzer__"); + + if (LangOpts.FastRelaxedMath) + Builder.defineMacro("__FAST_RELAXED_MATH__"); + + if (LangOpts.ObjCAutoRefCount) { + Builder.defineMacro("__weak", "__attribute__((objc_ownership(weak)))"); + Builder.defineMacro("__strong", "__attribute__((objc_ownership(strong)))"); + Builder.defineMacro("__autoreleasing", + "__attribute__((objc_ownership(autoreleasing)))"); + Builder.defineMacro("__unsafe_unretained", + "__attribute__((objc_ownership(none)))"); + } + + // Get other target #defines. + TI.getTargetDefines(LangOpts, Builder); +} + +// Initialize the remapping of files to alternative contents, e.g., +// those specified through other files. +static void InitializeFileRemapping(DiagnosticsEngine &Diags, + SourceManager &SourceMgr, + FileManager &FileMgr, + const PreprocessorOptions &InitOpts) { + // Remap files in the source manager (with buffers). + for (PreprocessorOptions::const_remapped_file_buffer_iterator + Remap = InitOpts.remapped_file_buffer_begin(), + RemapEnd = InitOpts.remapped_file_buffer_end(); + Remap != RemapEnd; + ++Remap) { + // Create the file entry for the file that we're mapping from. + const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, + Remap->second->getBufferSize(), + 0); + if (!FromFile) { + Diags.Report(diag::err_fe_remap_missing_from_file) + << Remap->first; + if (!InitOpts.RetainRemappedFileBuffers) + delete Remap->second; + continue; + } + + // Override the contents of the "from" file with the contents of + // the "to" file. + SourceMgr.overrideFileContents(FromFile, Remap->second, + InitOpts.RetainRemappedFileBuffers); + } + + // Remap files in the source manager (with other files). + for (PreprocessorOptions::const_remapped_file_iterator + Remap = InitOpts.remapped_file_begin(), + RemapEnd = InitOpts.remapped_file_end(); + Remap != RemapEnd; + ++Remap) { + // Find the file that we're mapping to. + const FileEntry *ToFile = FileMgr.getFile(Remap->second); + if (!ToFile) { + Diags.Report(diag::err_fe_remap_missing_to_file) + << Remap->first << Remap->second; + continue; + } + + // Create the file entry for the file that we're mapping from. + const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, + ToFile->getSize(), 0); + if (!FromFile) { + Diags.Report(diag::err_fe_remap_missing_from_file) + << Remap->first; + continue; + } + + // Override the contents of the "from" file with the contents of + // the "to" file. + SourceMgr.overrideFileContents(FromFile, ToFile); + } + + SourceMgr.setOverridenFilesKeepOriginalName( + InitOpts.RemappedFilesKeepOriginalName); +} + +/// InitializePreprocessor - Initialize the preprocessor getting it and the +/// environment ready to process a single file. This returns true on error. +/// +void clang::InitializePreprocessor(Preprocessor &PP, + const PreprocessorOptions &InitOpts, + const HeaderSearchOptions &HSOpts, + const FrontendOptions &FEOpts) { + const LangOptions &LangOpts = PP.getLangOpts(); + std::string PredefineBuffer; + PredefineBuffer.reserve(4080); + llvm::raw_string_ostream Predefines(PredefineBuffer); + MacroBuilder Builder(Predefines); + + InitializeFileRemapping(PP.getDiagnostics(), PP.getSourceManager(), + PP.getFileManager(), InitOpts); + + // Emit line markers for various builtin sections of the file. We don't do + // this in asm preprocessor mode, because "# 4" is not a line marker directive + // in this mode. + if (!PP.getLangOpts().AsmPreprocessor) + Builder.append("# 1 \"<built-in>\" 3"); + + // Install things like __POWERPC__, __GNUC__, etc into the macro table. + if (InitOpts.UsePredefines) { + InitializePredefinedMacros(PP.getTargetInfo(), LangOpts, FEOpts, Builder); + + // Install definitions to make Objective-C++ ARC work well with various + // C++ Standard Library implementations. + if (LangOpts.ObjC1 && LangOpts.CPlusPlus && LangOpts.ObjCAutoRefCount) { + switch (InitOpts.ObjCXXARCStandardLibrary) { + case ARCXX_nolib: + case ARCXX_libcxx: + break; + + case ARCXX_libstdcxx: + AddObjCXXARCLibstdcxxDefines(LangOpts, Builder); + break; + } + } + } + + // Even with predefines off, some macros are still predefined. + // These should all be defined in the preprocessor according to the + // current language configuration. + InitializeStandardPredefinedMacros(PP.getTargetInfo(), PP.getLangOpts(), + FEOpts, Builder); + + // Add on the predefines from the driver. Wrap in a #line directive to report + // that they come from the command line. + if (!PP.getLangOpts().AsmPreprocessor) + Builder.append("# 1 \"<command line>\" 1"); + + // Process #define's and #undef's in the order they are given. + for (unsigned i = 0, e = InitOpts.Macros.size(); i != e; ++i) { + if (InitOpts.Macros[i].second) // isUndef + Builder.undefineMacro(InitOpts.Macros[i].first); + else + DefineBuiltinMacro(Builder, InitOpts.Macros[i].first, + PP.getDiagnostics()); + } + + // If -imacros are specified, include them now. These are processed before + // any -include directives. + for (unsigned i = 0, e = InitOpts.MacroIncludes.size(); i != e; ++i) + AddImplicitIncludeMacros(Builder, InitOpts.MacroIncludes[i], + PP.getFileManager()); + + // Process -include directives. + for (unsigned i = 0, e = InitOpts.Includes.size(); i != e; ++i) { + const std::string &Path = InitOpts.Includes[i]; + if (Path == InitOpts.ImplicitPTHInclude) + AddImplicitIncludePTH(Builder, PP, Path); + else + AddImplicitInclude(Builder, Path, PP.getFileManager()); + } + + // Exit the command line and go back to <built-in> (2 is LC_LEAVE). + if (!PP.getLangOpts().AsmPreprocessor) + Builder.append("# 1 \"<built-in>\" 2"); + + // Instruct the preprocessor to skip the preamble. + PP.setSkipMainFilePreamble(InitOpts.PrecompiledPreambleBytes.first, + InitOpts.PrecompiledPreambleBytes.second); + + // Copy PredefinedBuffer into the Preprocessor. + PP.setPredefines(Predefines.str()); + + // Initialize the header search object. + ApplyHeaderSearchOptions(PP.getHeaderSearchInfo(), HSOpts, + PP.getLangOpts(), + PP.getTargetInfo().getTriple()); +} |