//===--- 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/Utils.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Frontend/PreprocessorOptions.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/SourceManager.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/System/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(std::vector<char> &Buf, const char *Macro,
Diagnostic *Diags = 0) {
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) {
assert(Diags && "Unexpected macro with embedded newline!");
Diags->Report(diag::warn_fe_macro_contains_embedded_newline)
<< std::string(Macro, Equal);
} 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');
}
std::string clang::NormalizeDashIncludePath(llvm::StringRef 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;
return Lexer::Stringify(Path.str());
}
/// Add the quoted name of an implicit include file.
static void AddQuotedIncludePath(std::vector<char> &Buf,
const std::string &File) {
// Escape double quotes etc.
Buf.push_back('"');
std::string EscapedFile = NormalizeDashIncludePath(File);
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) {
PP.getDiagnostics().Report(diag::err_fe_pth_file_has_no_source_header)
<< ImplicitIncludePTH;
return;
}
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 == (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(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);
// FIXME: Switch to using raw_ostream and avoid utostr().
sprintf(MacroBuf, "%s=%s%s", MacroName, llvm::utostr(MaxVal).c_str(),
ValSuffix);
DefineBuiltinMacro(Buf, MacroBuf);
}
/// DefineTypeSize - An overloaded helper that uses TargetInfo to determine
/// the width, suffix, and signedness of the given type
static void DefineTypeSize(const char *MacroName, TargetInfo::IntType Ty,
const TargetInfo &TI, std::vector<char> &Buf) {
DefineTypeSize(MacroName, TI.getTypeWidth(Ty), TI.getTypeConstantSuffix(Ty),
TI.isTypeSigned(Ty), Buf);
}
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 DefineTypeWidth(const char *MacroName, TargetInfo::IntType Ty,
const TargetInfo &TI, std::vector<char> &Buf) {
char MacroBuf[60];
sprintf(MacroBuf, "%s=%d", MacroName, TI.getTypeWidth(Ty));
DefineBuiltinMacro(Buf, MacroBuf);
}
static void DefineExactWidthIntType(TargetInfo::IntType Ty,
const TargetInfo &TI, std::vector<char> &Buf) {
char MacroBuf[60];
int TypeWidth = TI.getTypeWidth(Ty);
sprintf(MacroBuf, "__INT%d_TYPE__", TypeWidth);
DefineType(MacroBuf, Ty, Buf);
const char *ConstSuffix = TargetInfo::getTypeConstantSuffix(Ty);
if (strlen(ConstSuffix) > 0) {
sprintf(MacroBuf, "__INT%d_C_SUFFIX__=%s", TypeWidth, ConstSuffix);
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, "__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.CPlusPlus) {
if (LangOpts.C99)
DefineBuiltinMacro(Buf, "__STDC_VERSION__=199901L");
else if (!LangOpts.GNUMode && LangOpts.Digraphs)
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");
}
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.PascalStrings)
DefineBuiltinMacro(Buf, "__PASCAL_STRINGS__");
if (LangOpts.Blocks) {
DefineBuiltinMacro(Buf, "__block=__attribute__((__blocks__(byref)))");
DefineBuiltinMacro(Buf, "__BLOCKS__=1");
}
if (LangOpts.Exceptions)
DefineBuiltinMacro(Buf, "__EXCEPTIONS=1");
if (LangOpts.CPlusPlus) {
DefineBuiltinMacro(Buf, "__DEPRECATED=1");
DefineBuiltinMacro(Buf, "__GNUG__=4");
DefineBuiltinMacro(Buf, "__GXX_WEAK__=1");
if (LangOpts.GNUMode)
DefineBuiltinMacro(Buf, "__cplusplus=1");
else
// C++ [cpp.predefined]p1:
// The name_ _cplusplusis defined to the value199711Lwhen compiling a
// C++ translation unit.
DefineBuiltinMacro(Buf, "__cplusplus=199711L");
DefineBuiltinMacro(Buf, "__private_extern__=extern");
// Ugly hack to work with GNU libstdc++.
DefineBuiltinMacro(Buf, "_GNU_SOURCE=1");
}
if (LangOpts.Microsoft) {
// Filter out some microsoft extensions when trying to parse in ms-compat
// mode.
DefineBuiltinMacro(Buf, "__int8=__INT8_TYPE__");
DefineBuiltinMacro(Buf, "__int16=__INT16_TYPE__");
DefineBuiltinMacro(Buf, "__int32=__INT32_TYPE__");
DefineBuiltinMacro(Buf, "__int64=__INT64_TYPE__");
// Both __PRETTY_FUNCTION__ and __FUNCTION__ are GCC extensions, however
// VC++ appears to only like __FUNCTION__.
DefineBuiltinMacro(Buf, "__PRETTY_FUNCTION__=__FUNCTION__");
// Work around some issues with Visual C++ headerws.
if (LangOpts.CPlusPlus) {
// Since we define wchar_t in C++ mode.
DefineBuiltinMacro(Buf, "_WCHAR_T_DEFINED=1");
DefineBuiltinMacro(Buf, "_NATIVE_WCHAR_T_DEFINED=1");
// FIXME: This should be temporary until we have a __pragma
// solution, to avoid some errors flagged in VC++ headers.
DefineBuiltinMacro(Buf, "_CRT_SECURE_CPP_OVERLOAD_SECURE_NAMES=0");
}
}
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");
DefineTypeSize("__SCHAR_MAX__", TI.getCharWidth(), "", true, Buf);
DefineTypeSize("__SHRT_MAX__", TargetInfo::SignedShort, TI, Buf);
DefineTypeSize("__INT_MAX__", TargetInfo::SignedInt, TI, Buf);
DefineTypeSize("__LONG_MAX__", TargetInfo::SignedLong, TI, Buf);
DefineTypeSize("__LONG_LONG_MAX__", TargetInfo::SignedLongLong, TI, Buf);
DefineTypeSize("__WCHAR_MAX__", TI.getWCharType(), TI, Buf);
DefineTypeSize("__INTMAX_MAX__", TI.getIntMaxType(), TI, Buf);
DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Buf);
DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Buf);
DefineTypeWidth("__INTMAX_WIDTH__", TI.getIntMaxType(), TI, Buf);
DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Buf);
DefineTypeWidth("__PTRDIFF_WIDTH__", TI.getPtrDiffType(0), TI, Buf);
DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Buf);
DefineTypeWidth("__INTPTR_WIDTH__", TI.getIntPtrType(), TI, Buf);
DefineType("__SIZE_TYPE__", TI.getSizeType(), Buf);
DefineTypeWidth("__SIZE_WIDTH__", TI.getSizeType(), TI, Buf);
DefineType("__WCHAR_TYPE__", TI.getWCharType(), Buf);
DefineTypeWidth("__WCHAR_WIDTH__", TI.getWCharType(), TI, Buf);
DefineType("__WINT_TYPE__", TI.getWIntType(), Buf);
DefineTypeWidth("__WINT_WIDTH__", TI.getWIntType(), TI, Buf);
DefineTypeWidth("__SIG_ATOMIC_WIDTH__", TI.getSigAtomicType(), TI, Buf);
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 (!LangOpts.CharIsSigned)
DefineBuiltinMacro(Buf, "__CHAR_UNSIGNED__");
// Define exact-width integer types for stdint.h
sprintf(MacroBuf, "__INT%d_TYPE__=char", TI.getCharWidth());
DefineBuiltinMacro(Buf, MacroBuf);
if (TI.getShortWidth() > TI.getCharWidth())
DefineExactWidthIntType(TargetInfo::SignedShort, TI, Buf);
if (TI.getIntWidth() > TI.getShortWidth())
DefineExactWidthIntType(TargetInfo::SignedInt, TI, Buf);
if (TI.getLongWidth() > TI.getIntWidth())
DefineExactWidthIntType(TargetInfo::SignedLong, TI, Buf);
if (TI.getLongLongWidth() > TI.getLongWidth())
DefineExactWidthIntType(TargetInfo::SignedLongLong, TI, Buf);
// 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.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);
if (LangOpts.getStackProtectorMode() == LangOptions::SSPOn)
DefineBuiltinMacro(Buf, "__SSP__=1");
else if (LangOpts.getStackProtectorMode() == LangOptions::SSPReq)
DefineBuiltinMacro(Buf, "__SSP_ALL__=2");
// Get other target #defines.
TI.getTargetDefines(LangOpts, Buf);
}
// Initialize the remapping of files to alternative contents, e.g.,
// those specified through other files.
static void InitializeFileRemapping(Diagnostic &Diags,
SourceManager &SourceMgr,
FileManager &FileMgr,
const PreprocessorOptions &InitOpts) {
// Remap files in the source manager.
for (PreprocessorOptions::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;
}
// Load the contents of the file we're mapping to.
std::string ErrorStr;
const llvm::MemoryBuffer *Buffer
= llvm::MemoryBuffer::getFile(ToFile->getName(), &ErrorStr);
if (!Buffer) {
Diags.Report(diag::err_fe_error_opening)
<< Remap->second << ErrorStr;
continue;
}
// Override the contents of the "from" file with the contents of
// the "to" file.
SourceMgr.overrideFileContents(FromFile, Buffer);
}
}
/// 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) {
std::vector<char> PredefineBuffer;
InitializeFileRemapping(PP.getDiagnostics(), PP.getSourceManager(),
PP.getFileManager(), InitOpts);
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.
if (InitOpts.UsePredefines)
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 (unsigned i = 0, e = InitOpts.Macros.size(); i != e; ++i) {
if (InitOpts.Macros[i].second) // isUndef
UndefineBuiltinMacro(PredefineBuffer, InitOpts.Macros[i].first.c_str());
else
DefineBuiltinMacro(PredefineBuffer, InitOpts.Macros[i].first.c_str(),
&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(PredefineBuffer, InitOpts.MacroIncludes[i]);
// 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(PredefineBuffer, PP, Path);
else
AddImplicitInclude(PredefineBuffer, Path);
}
// Exit the command line and go back to <built-in> (2 is LC_LEAVE).
LineDirective = "# 1 \"<built-in>\" 2\n";
PredefineBuffer.insert(PredefineBuffer.end(),
LineDirective, LineDirective+strlen(LineDirective));
// Null terminate PredefinedBuffer and add it.
PredefineBuffer.push_back(0);
PP.setPredefines(&PredefineBuffer[0]);
// Initialize the header search object.
ApplyHeaderSearchOptions(PP.getHeaderSearchInfo(), HSOpts,
PP.getLangOptions(),
PP.getTargetInfo().getTriple());
}