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llvm-project/clang/lib/Lex/Preprocessor.cpp

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//===--- Preprocess.cpp - C Language Family Preprocessor Implementation ---===//
//
// 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 Preprocessor interface.
//
//===----------------------------------------------------------------------===//
//
// Options to support:
// -H - Print the name of each header file used.
// -d[DNI] - Dump various things.
// -fworking-directory - #line's with preprocessor's working dir.
// -fpreprocessed
// -dependency-file,-M,-MM,-MF,-MG,-MP,-MT,-MQ,-MD,-MMD
// -W*
// -w
//
// Messages to emit:
// "Multiple include guards may be useful for:\n"
//
//===----------------------------------------------------------------------===//
#include "clang/Lex/Preprocessor.h"
#include "clang/Lex/HeaderSearch.h"
#include "clang/Lex/MacroInfo.h"
#include "clang/Lex/Pragma.h"
#include "clang/Lex/ScratchBuffer.h"
#include "clang/Lex/LexDiagnostic.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Streams.h"
#include <cstdio>
using namespace clang;
//===----------------------------------------------------------------------===//
PreprocessorFactory::~PreprocessorFactory() {}
Preprocessor::Preprocessor(Diagnostic &diags, const LangOptions &opts,
TargetInfo &target, SourceManager &SM,
HeaderSearch &Headers,
IdentifierInfoLookup* IILookup)
: Diags(&diags), Features(opts), Target(target),FileMgr(Headers.getFileMgr()),
SourceMgr(SM), HeaderInfo(Headers), Identifiers(opts, IILookup),
CurPPLexer(0), CurDirLookup(0), Callbacks(0) {
ScratchBuf = new ScratchBuffer(SourceMgr);
// Clear stats.
NumDirectives = NumDefined = NumUndefined = NumPragma = 0;
NumIf = NumElse = NumEndif = 0;
NumEnteredSourceFiles = 0;
NumMacroExpanded = NumFnMacroExpanded = NumBuiltinMacroExpanded = 0;
NumFastMacroExpanded = NumTokenPaste = NumFastTokenPaste = 0;
MaxIncludeStackDepth = 0;
NumSkipped = 0;
// Default to discarding comments.
KeepComments = false;
KeepMacroComments = false;
// Macro expansion is enabled.
DisableMacroExpansion = false;
InMacroArgs = false;
NumCachedTokenLexers = 0;
CachedLexPos = 0;
// "Poison" __VA_ARGS__, which can only appear in the expansion of a macro.
// This gets unpoisoned where it is allowed.
(Ident__VA_ARGS__ = getIdentifierInfo("__VA_ARGS__"))->setIsPoisoned();
// Initialize the pragma handlers.
PragmaHandlers = new PragmaNamespace(0);
RegisterBuiltinPragmas();
// Initialize builtin macros like __LINE__ and friends.
RegisterBuiltinMacros();
}
Preprocessor::~Preprocessor() {
assert(BacktrackPositions.empty() && "EnableBacktrack/Backtrack imbalance!");
while (!IncludeMacroStack.empty()) {
delete IncludeMacroStack.back().TheLexer;
delete IncludeMacroStack.back().TheTokenLexer;
IncludeMacroStack.pop_back();
}
// Free any macro definitions.
for (llvm::DenseMap<IdentifierInfo*, MacroInfo*>::iterator I =
Macros.begin(), E = Macros.end(); I != E; ++I) {
// We don't need to free the MacroInfo objects directly. These
// will be released when the BumpPtrAllocator 'BP' object gets
// destroyed. We still need to run the dstor, however, to free
// memory alocated by MacroInfo.
I->second->Destroy(BP);
I->first->setHasMacroDefinition(false);
}
// Free any cached macro expanders.
for (unsigned i = 0, e = NumCachedTokenLexers; i != e; ++i)
delete TokenLexerCache[i];
// Release pragma information.
delete PragmaHandlers;
// Delete the scratch buffer info.
delete ScratchBuf;
delete Callbacks;
}
void Preprocessor::setPTHManager(PTHManager* pm) {
PTH.reset(pm);
FileMgr.setStatCache(PTH->createStatCache());
}
void Preprocessor::DumpToken(const Token &Tok, bool DumpFlags) const {
llvm::cerr << tok::getTokenName(Tok.getKind()) << " '"
<< getSpelling(Tok) << "'";
if (!DumpFlags) return;
llvm::cerr << "\t";
if (Tok.isAtStartOfLine())
llvm::cerr << " [StartOfLine]";
if (Tok.hasLeadingSpace())
llvm::cerr << " [LeadingSpace]";
if (Tok.isExpandDisabled())
llvm::cerr << " [ExpandDisabled]";
if (Tok.needsCleaning()) {
const char *Start = SourceMgr.getCharacterData(Tok.getLocation());
llvm::cerr << " [UnClean='" << std::string(Start, Start+Tok.getLength())
<< "']";
}
llvm::cerr << "\tLoc=<";
DumpLocation(Tok.getLocation());
llvm::cerr << ">";
}
void Preprocessor::DumpLocation(SourceLocation Loc) const {
Loc.dump(SourceMgr);
}
void Preprocessor::DumpMacro(const MacroInfo &MI) const {
llvm::cerr << "MACRO: ";
for (unsigned i = 0, e = MI.getNumTokens(); i != e; ++i) {
DumpToken(MI.getReplacementToken(i));
llvm::cerr << " ";
}
llvm::cerr << "\n";
}
void Preprocessor::PrintStats() {
llvm::cerr << "\n*** Preprocessor Stats:\n";
llvm::cerr << NumDirectives << " directives found:\n";
llvm::cerr << " " << NumDefined << " #define.\n";
llvm::cerr << " " << NumUndefined << " #undef.\n";
llvm::cerr << " #include/#include_next/#import:\n";
llvm::cerr << " " << NumEnteredSourceFiles << " source files entered.\n";
llvm::cerr << " " << MaxIncludeStackDepth << " max include stack depth\n";
llvm::cerr << " " << NumIf << " #if/#ifndef/#ifdef.\n";
llvm::cerr << " " << NumElse << " #else/#elif.\n";
llvm::cerr << " " << NumEndif << " #endif.\n";
llvm::cerr << " " << NumPragma << " #pragma.\n";
llvm::cerr << NumSkipped << " #if/#ifndef#ifdef regions skipped\n";
llvm::cerr << NumMacroExpanded << "/" << NumFnMacroExpanded << "/"
<< NumBuiltinMacroExpanded << " obj/fn/builtin macros expanded, "
<< NumFastMacroExpanded << " on the fast path.\n";
llvm::cerr << (NumFastTokenPaste+NumTokenPaste)
<< " token paste (##) operations performed, "
<< NumFastTokenPaste << " on the fast path.\n";
}
//===----------------------------------------------------------------------===//
// Token Spelling
//===----------------------------------------------------------------------===//
/// getSpelling() - Return the 'spelling' of this token. The spelling of a
/// token are the characters used to represent the token in the source file
/// after trigraph expansion and escaped-newline folding. In particular, this
/// wants to get the true, uncanonicalized, spelling of things like digraphs
/// UCNs, etc.
std::string Preprocessor::getSpelling(const Token &Tok) const {
assert((int)Tok.getLength() >= 0 && "Token character range is bogus!");
// If this token contains nothing interesting, return it directly.
const char* TokStart = SourceMgr.getCharacterData(Tok.getLocation());
if (!Tok.needsCleaning())
return std::string(TokStart, TokStart+Tok.getLength());
std::string Result;
Result.reserve(Tok.getLength());
// Otherwise, hard case, relex the characters into the string.
for (const char *Ptr = TokStart, *End = TokStart+Tok.getLength();
Ptr != End; ) {
unsigned CharSize;
Result.push_back(Lexer::getCharAndSizeNoWarn(Ptr, CharSize, Features));
Ptr += CharSize;
}
assert(Result.size() != unsigned(Tok.getLength()) &&
"NeedsCleaning flag set on something that didn't need cleaning!");
return Result;
}
/// getSpelling - This method is used to get the spelling of a token into a
/// preallocated buffer, instead of as an std::string. The caller is required
/// to allocate enough space for the token, which is guaranteed to be at least
/// Tok.getLength() bytes long. The actual length of the token is returned.
///
/// Note that this method may do two possible things: it may either fill in
/// the buffer specified with characters, or it may *change the input pointer*
/// to point to a constant buffer with the data already in it (avoiding a
/// copy). The caller is not allowed to modify the returned buffer pointer
/// if an internal buffer is returned.
unsigned Preprocessor::getSpelling(const Token &Tok,
const char *&Buffer) const {
assert((int)Tok.getLength() >= 0 && "Token character range is bogus!");
// If this token is an identifier, just return the string from the identifier
// table, which is very quick.
if (const IdentifierInfo *II = Tok.getIdentifierInfo()) {
Buffer = II->getName();
return II->getLength();
}
// Otherwise, compute the start of the token in the input lexer buffer.
const char *TokStart = 0;
if (Tok.isLiteral())
TokStart = Tok.getLiteralData();
if (TokStart == 0)
TokStart = SourceMgr.getCharacterData(Tok.getLocation());
// If this token contains nothing interesting, return it directly.
if (!Tok.needsCleaning()) {
Buffer = TokStart;
return Tok.getLength();
}
// Otherwise, hard case, relex the characters into the string.
char *OutBuf = const_cast<char*>(Buffer);
for (const char *Ptr = TokStart, *End = TokStart+Tok.getLength();
Ptr != End; ) {
unsigned CharSize;
*OutBuf++ = Lexer::getCharAndSizeNoWarn(Ptr, CharSize, Features);
Ptr += CharSize;
}
assert(unsigned(OutBuf-Buffer) != Tok.getLength() &&
"NeedsCleaning flag set on something that didn't need cleaning!");
return OutBuf-Buffer;
}
/// CreateString - Plop the specified string into a scratch buffer and return a
/// location for it. If specified, the source location provides a source
/// location for the token.
void Preprocessor::CreateString(const char *Buf, unsigned Len, Token &Tok,
SourceLocation InstantiationLoc) {
Tok.setLength(Len);
const char *DestPtr;
SourceLocation Loc = ScratchBuf->getToken(Buf, Len, DestPtr);
if (InstantiationLoc.isValid())
Loc = SourceMgr.createInstantiationLoc(Loc, InstantiationLoc,
InstantiationLoc, Len);
Tok.setLocation(Loc);
// If this is a literal token, set the pointer data.
if (Tok.isLiteral())
Tok.setLiteralData(DestPtr);
}
/// AdvanceToTokenCharacter - Given a location that specifies the start of a
/// token, return a new location that specifies a character within the token.
SourceLocation Preprocessor::AdvanceToTokenCharacter(SourceLocation TokStart,
unsigned CharNo) {
// If they request the first char of the token, we're trivially done.
if (CharNo == 0) return TokStart;
// Figure out how many physical characters away the specified instantiation
// character is. This needs to take into consideration newlines and
// trigraphs.
const char *TokPtr = SourceMgr.getCharacterData(TokStart);
unsigned PhysOffset = 0;
// The usual case is that tokens don't contain anything interesting. Skip
// over the uninteresting characters. If a token only consists of simple
// chars, this method is extremely fast.
while (CharNo && Lexer::isObviouslySimpleCharacter(*TokPtr))
++TokPtr, --CharNo, ++PhysOffset;
// If we have a character that may be a trigraph or escaped newline, use a
// lexer to parse it correctly.
if (CharNo != 0) {
// Skip over characters the remaining characters.
for (; CharNo; --CharNo) {
unsigned Size;
Lexer::getCharAndSizeNoWarn(TokPtr, Size, Features);
TokPtr += Size;
PhysOffset += Size;
}
}
return TokStart.getFileLocWithOffset(PhysOffset);
}
/// \brief Computes the source location just past the end of the
/// token at this source location.
///
/// This routine can be used to produce a source location that
/// points just past the end of the token referenced by \p Loc, and
/// is generally used when a diagnostic needs to point just after a
/// token where it expected something different that it received. If
/// the returned source location would not be meaningful (e.g., if
/// it points into a macro), this routine returns an invalid
/// source location.
SourceLocation Preprocessor::getLocForEndOfToken(SourceLocation Loc) {
if (Loc.isInvalid() || !Loc.isFileID())
return SourceLocation();
unsigned Len = Lexer::MeasureTokenLength(Loc, getSourceManager());
return AdvanceToTokenCharacter(Loc, Len);
}
//===----------------------------------------------------------------------===//
// Preprocessor Initialization Methods
//===----------------------------------------------------------------------===//
// 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(' ');
Buf.insert(Buf.end(), Equal+1, Equal+strlen(Equal));
} else {
// Push "macroname 1".
Buf.insert(Buf.end(), Macro, Macro+strlen(Macro));
Buf.push_back(' ');
Buf.push_back('1');
}
Buf.push_back('\n');
}
/// 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) {
if (Sem == &llvm::APFloat::IEEEsingle)
return IEEESingleVal;
if (Sem == &llvm::APFloat::IEEEdouble)
return IEEEDoubleVal;
if (Sem == &llvm::APFloat::x87DoubleExtended)
return X87DoubleExtendedVal;
assert(Sem == &llvm::APFloat::PPCDoubleDouble);
return PPCDoubleDoubleVal;
}
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");
int Digits = PickFP(Sem, 6, 15, 18, 31);
Epsilon = PickFP(Sem, "1.19209290e-7F", "2.2204460492503131e-16",
"1.08420217248550443401e-19L",
"4.94065645841246544176568792868221e-324L");
int HasInifinity = 1, HasQuietNaN = 1;
int MantissaDigits = PickFP(Sem, 24, 53, 64, 106);
int Min10Exp = PickFP(Sem, -37, -307, -4931, -291);
int Max10Exp = PickFP(Sem, 38, 308, 4932, 308);
int MinExp = PickFP(Sem, -125, -1021, -16381, -968);
int MaxExp = PickFP(Sem, 128, 1024, 16384, 1024);
Min = PickFP(Sem, "1.17549435e-38F", "2.2250738585072014e-308",
"3.36210314311209350626e-4932L",
"2.00416836000897277799610805135016e-292L");
Max = PickFP(Sem, "3.40282347e+38F", "1.7976931348623157e+308",
"1.18973149535723176502e+4932L",
"1.79769313486231580793728971405301e+308L");
char MacroBuf[60];
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(Preprocessor &PP,
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 (!PP.getLangOptions().Microsoft)
DefineBuiltinMacro(Buf, "__STDC__=1");
if (PP.getLangOptions().AsmPreprocessor)
DefineBuiltinMacro(Buf, "__ASSEMBLER__=1");
if (PP.getLangOptions().C99 && !PP.getLangOptions().CPlusPlus)
DefineBuiltinMacro(Buf, "__STDC_VERSION__=199901L");
else if (0) // STDC94 ?
DefineBuiltinMacro(Buf, "__STDC_VERSION__=199409L");
if (PP.getLangOptions().CPlusPlus0x)
DefineBuiltinMacro(Buf, "__GXX_EXPERIMENTAL_CXX0X__");
if (PP.getLangOptions().Freestanding)
DefineBuiltinMacro(Buf, "__STDC_HOSTED__=0");
else
DefineBuiltinMacro(Buf, "__STDC_HOSTED__=1");
if (PP.getLangOptions().ObjC1) {
DefineBuiltinMacro(Buf, "__OBJC__=1");
if (PP.getLangOptions().ObjCNonFragileABI)
DefineBuiltinMacro(Buf, "__OBJC2__=1");
if (PP.getLangOptions().getGCMode() == LangOptions::NonGC) {
DefineBuiltinMacro(Buf, "__weak=");
DefineBuiltinMacro(Buf, "__strong=");
} else {
DefineBuiltinMacro(Buf, "__weak=__attribute__((objc_gc(weak)))");
DefineBuiltinMacro(Buf, "__strong=__attribute__((objc_gc(strong)))");
DefineBuiltinMacro(Buf, "__OBJC_GC__=1");
}
if (PP.getLangOptions().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 (PP.getLangOptions().ObjC2)
DefineBuiltinMacro(Buf, "OBJC_NEW_PROPERTIES");
if (PP.getLangOptions().PascalStrings)
DefineBuiltinMacro(Buf, "__PASCAL_STRINGS__");
if (PP.getLangOptions().Blocks) {
DefineBuiltinMacro(Buf, "__block=__attribute__((__blocks__(byref)))");
DefineBuiltinMacro(Buf, "__BLOCKS__=1");
}
if (PP.getLangOptions().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 (PP.getLangOptions().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__");
}
// Initialize target-specific preprocessor defines.
const TargetInfo &TI = PP.getTargetInfo();
// 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, "__DYNAMIC__=1");
DefineBuiltinMacro(Buf, "__FINITE_MATH_ONLY__=0");
DefineBuiltinMacro(Buf, "__NO_INLINE__=1");
DefineBuiltinMacro(Buf, "__PIC__=1");
// 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));
DefineBuiltinMacro(Buf, MacroBuf);
// Get other target #defines.
TI.getTargetDefines(PP.getLangOptions(), Buf);
}
/// EnterMainSourceFile - Enter the specified FileID as the main source file,
/// which implicitly adds the builtin defines etc.
void Preprocessor::EnterMainSourceFile() {
// We do not allow the preprocessor to reenter the main file. Doing so will
// cause FileID's to accumulate information from both runs (e.g. #line
// information) and predefined macros aren't guaranteed to be set properly.
assert(NumEnteredSourceFiles == 0 && "Cannot reenter the main file!");
FileID MainFileID = SourceMgr.getMainFileID();
// Enter the main file source buffer.
EnterSourceFile(MainFileID, 0);
// Tell the header info that the main file was entered. If the file is later
// #imported, it won't be re-entered.
if (const FileEntry *FE = SourceMgr.getFileEntryForID(MainFileID))
HeaderInfo.IncrementIncludeCount(FE);
std::vector<char> PrologFile;
PrologFile.reserve(4080);
// Install things like __POWERPC__, __GNUC__, etc into the macro table.
InitializePredefinedMacros(*this, PrologFile);
// Add on the predefines from the driver. Wrap in a #line directive to report
// that they come from the command line.
const char *LineDirective = "# 1 \"<command line>\" 1\n";
PrologFile.insert(PrologFile.end(),
LineDirective, LineDirective+strlen(LineDirective));
PrologFile.insert(PrologFile.end(), Predefines.begin(), Predefines.end());
LineDirective = "# 2 \"<built-in>\" 2\n";
PrologFile.insert(PrologFile.end(),
LineDirective, LineDirective+strlen(LineDirective));
// Memory buffer must end with a null byte!
PrologFile.push_back(0);
// Now that we have emitted the predefined macros, #includes, etc into
// PrologFile, preprocess it to populate the initial preprocessor state.
llvm::MemoryBuffer *SB =
llvm::MemoryBuffer::getMemBufferCopy(&PrologFile.front(),&PrologFile.back(),
"<built-in>");
assert(SB && "Cannot fail to create predefined source buffer");
FileID FID = SourceMgr.createFileIDForMemBuffer(SB);
assert(!FID.isInvalid() && "Could not create FileID for predefines?");
// Start parsing the predefines.
EnterSourceFile(FID, 0);
}
//===----------------------------------------------------------------------===//
// Lexer Event Handling.
//===----------------------------------------------------------------------===//
/// LookUpIdentifierInfo - Given a tok::identifier token, look up the
/// identifier information for the token and install it into the token.
IdentifierInfo *Preprocessor::LookUpIdentifierInfo(Token &Identifier,
const char *BufPtr) {
assert(Identifier.is(tok::identifier) && "Not an identifier!");
assert(Identifier.getIdentifierInfo() == 0 && "Identinfo already exists!");
// Look up this token, see if it is a macro, or if it is a language keyword.
IdentifierInfo *II;
if (BufPtr && !Identifier.needsCleaning()) {
// No cleaning needed, just use the characters from the lexed buffer.
II = getIdentifierInfo(BufPtr, BufPtr+Identifier.getLength());
} else {
// Cleaning needed, alloca a buffer, clean into it, then use the buffer.
llvm::SmallVector<char, 64> IdentifierBuffer;
IdentifierBuffer.resize(Identifier.getLength());
const char *TmpBuf = &IdentifierBuffer[0];
unsigned Size = getSpelling(Identifier, TmpBuf);
II = getIdentifierInfo(TmpBuf, TmpBuf+Size);
}
Identifier.setIdentifierInfo(II);
return II;
}
/// HandleIdentifier - This callback is invoked when the lexer reads an
/// identifier. This callback looks up the identifier in the map and/or
/// potentially macro expands it or turns it into a named token (like 'for').
///
/// Note that callers of this method are guarded by checking the
/// IdentifierInfo's 'isHandleIdentifierCase' bit. If this method changes, the
/// IdentifierInfo methods that compute these properties will need to change to
/// match.
void Preprocessor::HandleIdentifier(Token &Identifier) {
assert(Identifier.getIdentifierInfo() &&
"Can't handle identifiers without identifier info!");
IdentifierInfo &II = *Identifier.getIdentifierInfo();
// If this identifier was poisoned, and if it was not produced from a macro
// expansion, emit an error.
if (II.isPoisoned() && CurPPLexer) {
if (&II != Ident__VA_ARGS__) // We warn about __VA_ARGS__ with poisoning.
Diag(Identifier, diag::err_pp_used_poisoned_id);
else
Diag(Identifier, diag::ext_pp_bad_vaargs_use);
}
// If this is a macro to be expanded, do it.
if (MacroInfo *MI = getMacroInfo(&II)) {
if (!DisableMacroExpansion && !Identifier.isExpandDisabled()) {
if (MI->isEnabled()) {
if (!HandleMacroExpandedIdentifier(Identifier, MI))
return;
} else {
// C99 6.10.3.4p2 says that a disabled macro may never again be
// expanded, even if it's in a context where it could be expanded in the
// future.
Identifier.setFlag(Token::DisableExpand);
}
}
}
// C++ 2.11p2: If this is an alternative representation of a C++ operator,
// then we act as if it is the actual operator and not the textual
// representation of it.
if (II.isCPlusPlusOperatorKeyword())
Identifier.setIdentifierInfo(0);
// If this is an extension token, diagnose its use.
// We avoid diagnosing tokens that originate from macro definitions.
if (II.isExtensionToken() && Features.C99 && !DisableMacroExpansion)
Diag(Identifier, diag::ext_token_used);
}
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