C++ MacroBuilder::append方法代码示例

/// \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.ObjCARCWeak) {
      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 AddImplicitIncludeMacros(MacroBuilder &Builder, StringRef File) {
  Builder.append(Twine("#__include_macros \"") + File + "\"");
  // Marker token to stop the __include_macros fetch loop.
  Builder.append("##"); // ##?
}

/// AddImplicitInclude - Add an implicit \#include of the specified file to the
/// predefines buffer.
/// As these includes are generated by -include arguments the header search
/// logic is going to search relatively to the current working directory.
static void AddImplicitInclude(MacroBuilder &Builder, StringRef File) {
  Builder.append(Twine("#include \"") + File + "\"");
}

/// 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) + "\"");
}

/// AddImplicitInclude - Add an implicit #include of the specified file to the
/// predefines buffer.
static void AddImplicitInclude(MacroBuilder &Builder, llvm::StringRef File) {
  Builder.append("#include \"" +
                 llvm::Twine(NormalizeDashIncludePath(File)) + "\"");
}

//.........这里部分代码省略.........
  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++ headers.
    if (LangOpts.WChar) {
      // wchar_t supported as a keyword.
      Builder.defineMacro("_WCHAR_T_DEFINED");
      Builder.defineMacro("_NATIVE_WCHAR_T_DEFINED");
    }
    if (LangOpts.CPlusPlus) {
      // FIXME: Support Microsoft's __identifier extension in the lexer.
      Builder.append("#define __identifier(x) x");
      Builder.append("class type_info;");
    }
  }

  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.

  // __BYTE_ORDER__ was added in GCC 4.6. It's analogous
  // to the macro __BYTE_ORDER (no trailing underscores)
  // from glibc's <endian.h> header.
  // We don't support the PDP-11 as a target, but include
  // the define so it can still be compared against.
  Builder.defineMacro("__ORDER_LITTLE_ENDIAN__", "1234");
  Builder.defineMacro("__ORDER_BIG_ENDIAN__",    "4321");
  Builder.defineMacro("__ORDER_PDP_ENDIAN__",    "3412");
  if (TI.isBigEndian())
    Builder.defineMacro("__BYTE_ORDER__", "__ORDER_BIG_ENDIAN__");
  else
    Builder.defineMacro("__BYTE_ORDER__", "__ORDER_LITTLE_ENDIAN__");


  if (TI.getPointerWidth(0) == 64 && TI.getLongWidth() == 64
      && TI.getIntWidth() == 32) {
    Builder.defineMacro("_LP64");
    Builder.defineMacro("__LP64__");

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
  // Currently claim to be compatible with GCC 4.2.1-5621.
  Builder.defineMacro("__GNUC_MINOR__", "2");
  Builder.defineMacro("__GNUC_PATCHLEVEL__", "1");
  Builder.defineMacro("__GNUC__", "4");
  Builder.defineMacro("__GXX_ABI_VERSION", "1002");

  // 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");
//.........这里部分代码省略.........

/// \brief Add definitions required for a smooth interaction between
/// Objective-C++ automatic reference counting and libc++.
static void AddObjCXXARCLibcxxDefines(const LangOptions &LangOpts, 
                                      MacroBuilder &Builder) {
  Builder.defineMacro("_LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF");
  
  std::string Result;
  {
    // Provide overloads of the function std::__1::addressof() that accept
    // references to lifetime-qualified objects. libc++'s (more general)
    // std::__1::addressof() template fails to instantiate with such types,
    // because it attempts to convert the object to a char& before 
    // dereferencing.
    llvm::raw_string_ostream Out(Result);
    
    Out << "#pragma clang diagnostic push\n"
        << "#pragma clang diagnostic ignored \"-Wc++0x-extensions\"\n"
        << "namespace std { inline namespace __1 {\n"
        << "\n";
    
    Out << "template <class _Tp>\n"
        << "inline __attribute__ ((__visibility__(\"hidden\"), "
        << "__always_inline__))\n"
        << "__attribute__((objc_ownership(strong))) _Tp*\n"
        << "addressof(__attribute__((objc_ownership(strong))) _Tp& __x) {\n"
        << "  return &__x;\n"
        << "}\n"
        << "\n";
      
    if (LangOpts.ObjCRuntimeHasWeak) {
      Out << "template <class _Tp>\n"
          << "inline __attribute__ ((__visibility__(\"hidden\"),"
          << "__always_inline__))\n"
          << "__attribute__((objc_ownership(weak))) _Tp*\n"
          << "addressof(__attribute__((objc_ownership(weak))) _Tp& __x) {\n"
          << "  return &__x;\n"
          << "};\n"
          << "\n";
    }
      
    Out << "template <class _Tp>\n"
        << "inline __attribute__ ((__visibility__(\"hidden\"),"
        << "__always_inline__))\n"
        << "__attribute__((objc_ownership(autoreleasing))) _Tp*\n"
        << "addressof(__attribute__((objc_ownership(autoreleasing))) _Tp& __x) "
        << "{\n"
        << " return &__x;\n"
        << "}\n"
        << "\n";
    
    Out << "template <class _Tp>\n"
        << "inline __attribute__ ((__visibility__(\"hidden\"), "
        << "__always_inline__))\n"
        << "__unsafe_unretained _Tp* addressof(__unsafe_unretained _Tp& __x)"
        << " {\n"
        << "  return &__x;\n"
        << "}\n";
      
    Out << "\n"
        << "} }\n"
        << "#pragma clang diagnostic pop\n"
        << "\n";    
  }
  Builder.append(Result);
}