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Diffstat (limited to 'lib/Frontend/InitPreprocessor.cpp')
| -rw-r--r-- | lib/Frontend/InitPreprocessor.cpp | 495 |
1 files changed, 495 insertions, 0 deletions
diff --git a/lib/Frontend/InitPreprocessor.cpp b/lib/Frontend/InitPreprocessor.cpp new file mode 100644 index 0000000..0945037 --- /dev/null +++ b/lib/Frontend/InitPreprocessor.cpp @@ -0,0 +1,495 @@ +//===--- 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/Frontend/InitPreprocessor.h" +#include "clang/Basic/TargetInfo.h" +#include "clang/Lex/Preprocessor.h" +#include "llvm/ADT/StringExtras.h" +#include "llvm/ADT/STLExtras.h" +#include "llvm/System/Path.h" + +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(std::vector<char> &Buf, const char *Macro, + const char *Command = "#define ") { + Buf.insert(Buf.end(), Command, Command+strlen(Command)); + if (const char *Equal = strchr(Macro, '=')) { + // Turn the = into ' '. + Buf.insert(Buf.end(), Macro, Equal); + Buf.push_back(' '); + + // Per GCC -D semantics, the macro ends at \n if it exists. + const char *End = strpbrk(Equal, "\n\r"); + if (End) { + fprintf(stderr, "warning: macro '%s' contains embedded newline, text " + "after the newline is ignored.\n", + std::string(Macro, Equal).c_str()); + } else { + End = Equal+strlen(Equal); + } + + Buf.insert(Buf.end(), Equal+1, End); + } else { + // Push "macroname 1". + Buf.insert(Buf.end(), Macro, Macro+strlen(Macro)); + Buf.push_back(' '); + Buf.push_back('1'); + } + Buf.push_back('\n'); +} + +// Append a #undef line to Buf for Macro. Macro should be of the form XXX +// and we emit "#undef XXX". +static void UndefineBuiltinMacro(std::vector<char> &Buf, const char *Macro) { + // Push "macroname". + const char *Command = "#undef "; + Buf.insert(Buf.end(), Command, Command+strlen(Command)); + Buf.insert(Buf.end(), Macro, Macro+strlen(Macro)); + Buf.push_back('\n'); +} + +/// Add the quoted name of an implicit include file. +static void AddQuotedIncludePath(std::vector<char> &Buf, + const std::string &File) { + // Implicit include paths should be resolved relative to the current + // working directory first, and then use the regular header search + // mechanism. The proper way to handle this is to have the + // predefines buffer located at the current working directory, but + // it has not file entry. For now, workaround this by using an + // absolute path if we find the file here, and otherwise letting + // header search handle it. + llvm::sys::Path Path(File); + Path.makeAbsolute(); + if (!Path.exists()) + Path = File; + + // Escape double quotes etc. + Buf.push_back('"'); + std::string EscapedFile = Lexer::Stringify(Path.toString()); + Buf.insert(Buf.end(), EscapedFile.begin(), EscapedFile.end()); + Buf.push_back('"'); +} + +/// AddImplicitInclude - Add an implicit #include of the specified file to the +/// predefines buffer. +static void AddImplicitInclude(std::vector<char> &Buf, + const std::string &File) { + const char *Inc = "#include "; + Buf.insert(Buf.end(), Inc, Inc+strlen(Inc)); + AddQuotedIncludePath(Buf, File); + Buf.push_back('\n'); +} + +static void AddImplicitIncludeMacros(std::vector<char> &Buf, + const std::string &File) { + const char *Inc = "#__include_macros "; + Buf.insert(Buf.end(), Inc, Inc+strlen(Inc)); + AddQuotedIncludePath(Buf, File); + Buf.push_back('\n'); + // Marker token to stop the __include_macros fetch loop. + const char *Marker = "##\n"; // ##? + Buf.insert(Buf.end(), Marker, Marker+strlen(Marker)); +} + +/// AddImplicitIncludePTH - Add an implicit #include using the original file +/// used to generate a PTH cache. +static void AddImplicitIncludePTH(std::vector<char> &Buf, Preprocessor &PP, + const std::string& ImplicitIncludePTH) { + PTHManager *P = PP.getPTHManager(); + assert(P && "No PTHManager."); + const char *OriginalFile = P->getOriginalSourceFile(); + + if (!OriginalFile) { + assert(!ImplicitIncludePTH.empty()); + fprintf(stderr, "error: PTH file '%s' does not designate an original " + "source header file for -include-pth\n", + ImplicitIncludePTH.c_str()); + exit (1); + } + + AddImplicitInclude(Buf, OriginalFile); +} + +/// 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 == &llvm::APFloat::IEEEsingle) + return IEEESingleVal; + if (Sem == &llvm::APFloat::IEEEdouble) + return IEEEDoubleVal; + if (Sem == &llvm::APFloat::x87DoubleExtended) + return X87DoubleExtendedVal; + if (Sem == &llvm::APFloat::PPCDoubleDouble) + return PPCDoubleDoubleVal; + assert(Sem == &llvm::APFloat::IEEEquad); + return IEEEQuadVal; +} + +static void DefineFloatMacros(std::vector<char> &Buf, const char *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 HasInifinity = 1, HasQuietNaN = 1; + 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"); + + char MacroBuf[100]; + sprintf(MacroBuf, "__%s_DENORM_MIN__=%s", Prefix, DenormMin); + DefineBuiltinMacro(Buf, MacroBuf); + sprintf(MacroBuf, "__%s_DIG__=%d", Prefix, Digits); + DefineBuiltinMacro(Buf, MacroBuf); + sprintf(MacroBuf, "__%s_EPSILON__=%s", Prefix, Epsilon); + DefineBuiltinMacro(Buf, MacroBuf); + sprintf(MacroBuf, "__%s_HAS_INFINITY__=%d", Prefix, HasInifinity); + DefineBuiltinMacro(Buf, MacroBuf); + sprintf(MacroBuf, "__%s_HAS_QUIET_NAN__=%d", Prefix, HasQuietNaN); + DefineBuiltinMacro(Buf, MacroBuf); + sprintf(MacroBuf, "__%s_MANT_DIG__=%d", Prefix, MantissaDigits); + DefineBuiltinMacro(Buf, MacroBuf); + sprintf(MacroBuf, "__%s_MAX_10_EXP__=%d", Prefix, Max10Exp); + DefineBuiltinMacro(Buf, MacroBuf); + sprintf(MacroBuf, "__%s_MAX_EXP__=%d", Prefix, MaxExp); + DefineBuiltinMacro(Buf, MacroBuf); + sprintf(MacroBuf, "__%s_MAX__=%s", Prefix, Max); + DefineBuiltinMacro(Buf, MacroBuf); + sprintf(MacroBuf, "__%s_MIN_10_EXP__=(%d)", Prefix, Min10Exp); + DefineBuiltinMacro(Buf, MacroBuf); + sprintf(MacroBuf, "__%s_MIN_EXP__=(%d)", Prefix, MinExp); + DefineBuiltinMacro(Buf, MacroBuf); + sprintf(MacroBuf, "__%s_MIN__=%s", Prefix, Min); + DefineBuiltinMacro(Buf, MacroBuf); + sprintf(MacroBuf, "__%s_HAS_DENORM__=1", Prefix); + DefineBuiltinMacro(Buf, MacroBuf); +} + + +/// 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(const char *MacroName, unsigned TypeWidth, + const char *ValSuffix, bool isSigned, + std::vector<char> &Buf) { + char MacroBuf[60]; + long long MaxVal; + if (isSigned) + MaxVal = (1LL << (TypeWidth - 1)) - 1; + else + MaxVal = ~0LL >> (64-TypeWidth); + + sprintf(MacroBuf, "%s=%llu%s", MacroName, MaxVal, ValSuffix); + DefineBuiltinMacro(Buf, MacroBuf); +} + +static void DefineType(const char *MacroName, TargetInfo::IntType Ty, + std::vector<char> &Buf) { + char MacroBuf[60]; + sprintf(MacroBuf, "%s=%s", MacroName, TargetInfo::getTypeName(Ty)); + DefineBuiltinMacro(Buf, MacroBuf); +} + + +static void InitializePredefinedMacros(const TargetInfo &TI, + const LangOptions &LangOpts, + std::vector<char> &Buf) { + char MacroBuf[60]; + // Compiler version introspection macros. + DefineBuiltinMacro(Buf, "__llvm__=1"); // LLVM Backend + DefineBuiltinMacro(Buf, "__clang__=1"); // Clang Frontend + + // Currently claim to be compatible with GCC 4.2.1-5621. + DefineBuiltinMacro(Buf, "__APPLE_CC__=5621"); + DefineBuiltinMacro(Buf, "__GNUC_MINOR__=2"); + DefineBuiltinMacro(Buf, "__GNUC_PATCHLEVEL__=1"); + DefineBuiltinMacro(Buf, "__GNUC__=4"); + DefineBuiltinMacro(Buf, "__GXX_ABI_VERSION=1002"); + DefineBuiltinMacro(Buf, "__VERSION__=\"4.2.1 Compatible Clang Compiler\""); + + + // Initialize language-specific preprocessor defines. + + // These should all be defined in the preprocessor according to the + // current language configuration. + if (!LangOpts.Microsoft) + DefineBuiltinMacro(Buf, "__STDC__=1"); + if (LangOpts.AsmPreprocessor) + DefineBuiltinMacro(Buf, "__ASSEMBLER__=1"); + if (LangOpts.C99 && !LangOpts.CPlusPlus) + DefineBuiltinMacro(Buf, "__STDC_VERSION__=199901L"); + else if (0) // STDC94 ? + DefineBuiltinMacro(Buf, "__STDC_VERSION__=199409L"); + + // Standard conforming mode? + if (!LangOpts.GNUMode) + DefineBuiltinMacro(Buf, "__STRICT_ANSI__=1"); + + if (LangOpts.CPlusPlus0x) + DefineBuiltinMacro(Buf, "__GXX_EXPERIMENTAL_CXX0X__"); + + if (LangOpts.Freestanding) + DefineBuiltinMacro(Buf, "__STDC_HOSTED__=0"); + else + DefineBuiltinMacro(Buf, "__STDC_HOSTED__=1"); + + if (LangOpts.ObjC1) { + DefineBuiltinMacro(Buf, "__OBJC__=1"); + if (LangOpts.ObjCNonFragileABI) { + DefineBuiltinMacro(Buf, "__OBJC2__=1"); + DefineBuiltinMacro(Buf, "OBJC_ZEROCOST_EXCEPTIONS=1"); + DefineBuiltinMacro(Buf, "__EXCEPTIONS=1"); + } + + if (LangOpts.getGCMode() != LangOptions::NonGC) + DefineBuiltinMacro(Buf, "__OBJC_GC__=1"); + + if (LangOpts.NeXTRuntime) + DefineBuiltinMacro(Buf, "__NEXT_RUNTIME__=1"); + } + + // darwin_constant_cfstrings controls this. This is also dependent + // on other things like the runtime I believe. This is set even for C code. + DefineBuiltinMacro(Buf, "__CONSTANT_CFSTRINGS__=1"); + + if (LangOpts.ObjC2) + DefineBuiltinMacro(Buf, "OBJC_NEW_PROPERTIES"); + + if (LangOpts.ObjCSenderDispatch) + DefineBuiltinMacro(Buf, "__OBJC_SENDER_AWARE_DISPATCH__"); + + if (LangOpts.PascalStrings) + DefineBuiltinMacro(Buf, "__PASCAL_STRINGS__"); + + if (LangOpts.Blocks) { + DefineBuiltinMacro(Buf, "__block=__attribute__((__blocks__(byref)))"); + DefineBuiltinMacro(Buf, "__BLOCKS__=1"); + } + + if (LangOpts.CPlusPlus) { + DefineBuiltinMacro(Buf, "__DEPRECATED=1"); + DefineBuiltinMacro(Buf, "__EXCEPTIONS=1"); + DefineBuiltinMacro(Buf, "__GNUG__=4"); + DefineBuiltinMacro(Buf, "__GXX_WEAK__=1"); + DefineBuiltinMacro(Buf, "__cplusplus=1"); + DefineBuiltinMacro(Buf, "__private_extern__=extern"); + } + + // Filter out some microsoft extensions when trying to parse in ms-compat + // mode. + if (LangOpts.Microsoft) { + DefineBuiltinMacro(Buf, "_cdecl=__cdecl"); + DefineBuiltinMacro(Buf, "__int8=__INT8_TYPE__"); + DefineBuiltinMacro(Buf, "__int16=__INT16_TYPE__"); + DefineBuiltinMacro(Buf, "__int32=__INT32_TYPE__"); + DefineBuiltinMacro(Buf, "__int64=__INT64_TYPE__"); + } + + if (LangOpts.Optimize) + DefineBuiltinMacro(Buf, "__OPTIMIZE__=1"); + if (LangOpts.OptimizeSize) + DefineBuiltinMacro(Buf, "__OPTIMIZE_SIZE__=1"); + + // 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"); + DefineBuiltinMacro(Buf, "__CHAR_BIT__=8"); + + unsigned IntMaxWidth; + const char *IntMaxSuffix; + if (TI.getIntMaxType() == TargetInfo::SignedLongLong) { + IntMaxWidth = TI.getLongLongWidth(); + IntMaxSuffix = "LL"; + } else if (TI.getIntMaxType() == TargetInfo::SignedLong) { + IntMaxWidth = TI.getLongWidth(); + IntMaxSuffix = "L"; + } else { + assert(TI.getIntMaxType() == TargetInfo::SignedInt); + IntMaxWidth = TI.getIntWidth(); + IntMaxSuffix = ""; + } + + DefineTypeSize("__SCHAR_MAX__", TI.getCharWidth(), "", true, Buf); + DefineTypeSize("__SHRT_MAX__", TI.getShortWidth(), "", true, Buf); + DefineTypeSize("__INT_MAX__", TI.getIntWidth(), "", true, Buf); + DefineTypeSize("__LONG_MAX__", TI.getLongWidth(), "L", true, Buf); + DefineTypeSize("__LONG_LONG_MAX__", TI.getLongLongWidth(), "LL", true, Buf); + DefineTypeSize("__WCHAR_MAX__", TI.getWCharWidth(), "", true, Buf); + DefineTypeSize("__INTMAX_MAX__", IntMaxWidth, IntMaxSuffix, true, Buf); + + DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Buf); + DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Buf); + DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Buf); + DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Buf); + DefineType("__SIZE_TYPE__", TI.getSizeType(), Buf); + DefineType("__WCHAR_TYPE__", TI.getWCharType(), Buf); + // FIXME: TargetInfo hookize __WINT_TYPE__. + DefineBuiltinMacro(Buf, "__WINT_TYPE__=int"); + + DefineFloatMacros(Buf, "FLT", &TI.getFloatFormat()); + DefineFloatMacros(Buf, "DBL", &TI.getDoubleFormat()); + DefineFloatMacros(Buf, "LDBL", &TI.getLongDoubleFormat()); + + // Define a __POINTER_WIDTH__ macro for stdint.h. + sprintf(MacroBuf, "__POINTER_WIDTH__=%d", (int)TI.getPointerWidth(0)); + DefineBuiltinMacro(Buf, MacroBuf); + + if (!TI.isCharSigned()) + DefineBuiltinMacro(Buf, "__CHAR_UNSIGNED__"); + + // Define fixed-sized integer types for stdint.h + assert(TI.getCharWidth() == 8 && "unsupported target types"); + assert(TI.getShortWidth() == 16 && "unsupported target types"); + DefineBuiltinMacro(Buf, "__INT8_TYPE__=char"); + DefineBuiltinMacro(Buf, "__INT16_TYPE__=short"); + + if (TI.getIntWidth() == 32) + DefineBuiltinMacro(Buf, "__INT32_TYPE__=int"); + else { + assert(TI.getLongLongWidth() == 32 && "unsupported target types"); + DefineBuiltinMacro(Buf, "__INT32_TYPE__=long long"); + } + + // 16-bit targets doesn't necessarily have a 64-bit type. + if (TI.getLongLongWidth() == 64) + DefineBuiltinMacro(Buf, "__INT64_TYPE__=long long"); + + // Add __builtin_va_list typedef. + { + const char *VAList = TI.getVAListDeclaration(); + Buf.insert(Buf.end(), VAList, VAList+strlen(VAList)); + Buf.push_back('\n'); + } + + if (const char *Prefix = TI.getUserLabelPrefix()) { + sprintf(MacroBuf, "__USER_LABEL_PREFIX__=%s", Prefix); + DefineBuiltinMacro(Buf, MacroBuf); + } + + // Build configuration options. FIXME: these should be controlled by + // command line options or something. + DefineBuiltinMacro(Buf, "__FINITE_MATH_ONLY__=0"); + + if (LangOpts.Static) + DefineBuiltinMacro(Buf, "__STATIC__=1"); + else + DefineBuiltinMacro(Buf, "__DYNAMIC__=1"); + + if (LangOpts.GNUInline) + DefineBuiltinMacro(Buf, "__GNUC_GNU_INLINE__=1"); + else + DefineBuiltinMacro(Buf, "__GNUC_STDC_INLINE__=1"); + + if (LangOpts.NoInline) + DefineBuiltinMacro(Buf, "__NO_INLINE__=1"); + + if (unsigned PICLevel = LangOpts.PICLevel) { + sprintf(MacroBuf, "__PIC__=%d", PICLevel); + DefineBuiltinMacro(Buf, MacroBuf); + + sprintf(MacroBuf, "__pic__=%d", PICLevel); + DefineBuiltinMacro(Buf, MacroBuf); + } + + // Macros to control C99 numerics and <float.h> + DefineBuiltinMacro(Buf, "__FLT_EVAL_METHOD__=0"); + DefineBuiltinMacro(Buf, "__FLT_RADIX__=2"); + sprintf(MacroBuf, "__DECIMAL_DIG__=%d", + PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33, 36)); + DefineBuiltinMacro(Buf, MacroBuf); + + // Get other target #defines. + TI.getTargetDefines(LangOpts, Buf); +} + +/// InitializePreprocessor - Initialize the preprocessor getting it and the +/// environment ready to process a single file. This returns true on error. +/// +bool InitializePreprocessor(Preprocessor &PP, + const PreprocessorInitOptions& InitOpts) { + std::vector<char> PredefineBuffer; + + const char *LineDirective = "# 1 \"<built-in>\" 3\n"; + PredefineBuffer.insert(PredefineBuffer.end(), + LineDirective, LineDirective+strlen(LineDirective)); + + // Install things like __POWERPC__, __GNUC__, etc into the macro table. + InitializePredefinedMacros(PP.getTargetInfo(), PP.getLangOptions(), + PredefineBuffer); + + // Add on the predefines from the driver. Wrap in a #line directive to report + // that they come from the command line. + LineDirective = "# 1 \"<command line>\" 1\n"; + PredefineBuffer.insert(PredefineBuffer.end(), + LineDirective, LineDirective+strlen(LineDirective)); + + // Process #define's and #undef's in the order they are given. + for (PreprocessorInitOptions::macro_iterator I = InitOpts.macro_begin(), + E = InitOpts.macro_end(); I != E; ++I) { + if (I->second) // isUndef + UndefineBuiltinMacro(PredefineBuffer, I->first.c_str()); + else + DefineBuiltinMacro(PredefineBuffer, I->first.c_str()); + } + + // If -imacros are specified, include them now. These are processed before + // any -include directives. + for (PreprocessorInitOptions::imacro_iterator I = InitOpts.imacro_begin(), + E = InitOpts.imacro_end(); I != E; ++I) + AddImplicitIncludeMacros(PredefineBuffer, *I); + + // Process -include directives. + for (PreprocessorInitOptions::include_iterator I = InitOpts.include_begin(), + E = InitOpts.include_end(); I != E; ++I) { + if (I->second) // isPTH + AddImplicitIncludePTH(PredefineBuffer, PP, I->first); + else + AddImplicitInclude(PredefineBuffer, I->first); + } + + LineDirective = "# 2 \"<built-in>\" 2 3\n"; + PredefineBuffer.insert(PredefineBuffer.end(), + LineDirective, LineDirective+strlen(LineDirective)); + + // Null terminate PredefinedBuffer and add it. + PredefineBuffer.push_back(0); + PP.setPredefines(&PredefineBuffer[0]); + + // Once we've read this, we're done. + return false; +} + +} // namespace clang |
