Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1 | //===--- Preprocess.cpp - C Language Family Preprocessor Implementation ---===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
Chris Lattner | 0bc735f | 2007-12-29 19:59:25 +0000 | [diff] [blame] | 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This file implements the Preprocessor interface. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | // |
| 14 | // Options to support: |
| 15 | // -H - Print the name of each header file used. |
| 16 | // -d[MDNI] - Dump various things. |
| 17 | // -fworking-directory - #line's with preprocessor's working dir. |
| 18 | // -fpreprocessed |
| 19 | // -dependency-file,-M,-MM,-MF,-MG,-MP,-MT,-MQ,-MD,-MMD |
| 20 | // -W* |
| 21 | // -w |
| 22 | // |
| 23 | // Messages to emit: |
| 24 | // "Multiple include guards may be useful for:\n" |
| 25 | // |
| 26 | //===----------------------------------------------------------------------===// |
| 27 | |
| 28 | #include "clang/Lex/Preprocessor.h" |
| 29 | #include "clang/Lex/HeaderSearch.h" |
| 30 | #include "clang/Lex/MacroInfo.h" |
| 31 | #include "clang/Lex/PPCallbacks.h" |
| 32 | #include "clang/Lex/Pragma.h" |
| 33 | #include "clang/Lex/ScratchBuffer.h" |
| 34 | #include "clang/Basic/Diagnostic.h" |
| 35 | #include "clang/Basic/FileManager.h" |
| 36 | #include "clang/Basic/SourceManager.h" |
| 37 | #include "clang/Basic/TargetInfo.h" |
| 38 | #include "llvm/ADT/SmallVector.h" |
Chris Lattner | 97ba77c | 2007-07-16 06:48:38 +0000 | [diff] [blame] | 39 | #include "llvm/Support/MemoryBuffer.h" |
Ted Kremenek | bdd30c2 | 2008-01-14 16:44:48 +0000 | [diff] [blame] | 40 | #include "llvm/Support/Streams.h" |
Chris Lattner | 77034d3 | 2007-09-03 18:30:32 +0000 | [diff] [blame] | 41 | #include <ctime> |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 42 | using namespace clang; |
| 43 | |
| 44 | //===----------------------------------------------------------------------===// |
| 45 | |
| 46 | Preprocessor::Preprocessor(Diagnostic &diags, const LangOptions &opts, |
| 47 | TargetInfo &target, SourceManager &SM, |
| 48 | HeaderSearch &Headers) |
| 49 | : Diags(diags), Features(opts), Target(target), FileMgr(Headers.getFileMgr()), |
| 50 | SourceMgr(SM), HeaderInfo(Headers), Identifiers(opts), |
| 51 | CurLexer(0), CurDirLookup(0), CurMacroExpander(0), Callbacks(0) { |
| 52 | ScratchBuf = new ScratchBuffer(SourceMgr); |
Chris Lattner | 9594acf | 2007-07-15 00:25:26 +0000 | [diff] [blame] | 53 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 54 | // Clear stats. |
| 55 | NumDirectives = NumDefined = NumUndefined = NumPragma = 0; |
| 56 | NumIf = NumElse = NumEndif = 0; |
| 57 | NumEnteredSourceFiles = 0; |
| 58 | NumMacroExpanded = NumFnMacroExpanded = NumBuiltinMacroExpanded = 0; |
| 59 | NumFastMacroExpanded = NumTokenPaste = NumFastTokenPaste = 0; |
| 60 | MaxIncludeStackDepth = 0; |
| 61 | NumSkipped = 0; |
| 62 | |
| 63 | // Default to discarding comments. |
| 64 | KeepComments = false; |
| 65 | KeepMacroComments = false; |
| 66 | |
| 67 | // Macro expansion is enabled. |
| 68 | DisableMacroExpansion = false; |
| 69 | InMacroArgs = false; |
Chris Lattner | 9594acf | 2007-07-15 00:25:26 +0000 | [diff] [blame] | 70 | NumCachedMacroExpanders = 0; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 71 | |
| 72 | // "Poison" __VA_ARGS__, which can only appear in the expansion of a macro. |
| 73 | // This gets unpoisoned where it is allowed. |
| 74 | (Ident__VA_ARGS__ = getIdentifierInfo("__VA_ARGS__"))->setIsPoisoned(); |
| 75 | |
Chris Lattner | 53b0dab | 2007-10-09 22:10:18 +0000 | [diff] [blame] | 76 | Predefines = 0; |
| 77 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 78 | // Initialize the pragma handlers. |
| 79 | PragmaHandlers = new PragmaNamespace(0); |
| 80 | RegisterBuiltinPragmas(); |
| 81 | |
| 82 | // Initialize builtin macros like __LINE__ and friends. |
| 83 | RegisterBuiltinMacros(); |
| 84 | } |
| 85 | |
| 86 | Preprocessor::~Preprocessor() { |
| 87 | // Free any active lexers. |
| 88 | delete CurLexer; |
| 89 | |
| 90 | while (!IncludeMacroStack.empty()) { |
| 91 | delete IncludeMacroStack.back().TheLexer; |
| 92 | delete IncludeMacroStack.back().TheMacroExpander; |
| 93 | IncludeMacroStack.pop_back(); |
| 94 | } |
Chris Lattner | cc1a875 | 2007-10-07 08:44:20 +0000 | [diff] [blame] | 95 | |
| 96 | // Free any macro definitions. |
| 97 | for (llvm::DenseMap<IdentifierInfo*, MacroInfo*>::iterator I = |
| 98 | Macros.begin(), E = Macros.end(); I != E; ++I) { |
| 99 | // Free the macro definition. |
| 100 | delete I->second; |
| 101 | I->second = 0; |
| 102 | I->first->setHasMacroDefinition(false); |
| 103 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 104 | |
Chris Lattner | 9594acf | 2007-07-15 00:25:26 +0000 | [diff] [blame] | 105 | // Free any cached macro expanders. |
| 106 | for (unsigned i = 0, e = NumCachedMacroExpanders; i != e; ++i) |
| 107 | delete MacroExpanderCache[i]; |
| 108 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 109 | // Release pragma information. |
| 110 | delete PragmaHandlers; |
| 111 | |
| 112 | // Delete the scratch buffer info. |
| 113 | delete ScratchBuf; |
| 114 | } |
| 115 | |
| 116 | PPCallbacks::~PPCallbacks() { |
| 117 | } |
| 118 | |
| 119 | /// Diag - Forwarding function for diagnostics. This emits a diagnostic at |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 120 | /// the specified Token's location, translating the token's start |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 121 | /// position in the current buffer into a SourcePosition object for rendering. |
| 122 | void Preprocessor::Diag(SourceLocation Loc, unsigned DiagID) { |
Ted Kremenek | 9c728dc | 2007-12-12 22:39:36 +0000 | [diff] [blame] | 123 | Diags.Report(getFullLoc(Loc), DiagID); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 124 | } |
| 125 | |
| 126 | void Preprocessor::Diag(SourceLocation Loc, unsigned DiagID, |
| 127 | const std::string &Msg) { |
Ted Kremenek | 9c728dc | 2007-12-12 22:39:36 +0000 | [diff] [blame] | 128 | Diags.Report(getFullLoc(Loc), DiagID, &Msg, 1); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 129 | } |
| 130 | |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 131 | void Preprocessor::DumpToken(const Token &Tok, bool DumpFlags) const { |
Ted Kremenek | bdd30c2 | 2008-01-14 16:44:48 +0000 | [diff] [blame] | 132 | llvm::cerr << tok::getTokenName(Tok.getKind()) << " '" |
| 133 | << getSpelling(Tok) << "'"; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 134 | |
| 135 | if (!DumpFlags) return; |
Chris Lattner | c3d8d57 | 2007-12-09 20:31:55 +0000 | [diff] [blame] | 136 | |
Ted Kremenek | bdd30c2 | 2008-01-14 16:44:48 +0000 | [diff] [blame] | 137 | llvm::cerr << "\t"; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 138 | if (Tok.isAtStartOfLine()) |
Ted Kremenek | bdd30c2 | 2008-01-14 16:44:48 +0000 | [diff] [blame] | 139 | llvm::cerr << " [StartOfLine]"; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 140 | if (Tok.hasLeadingSpace()) |
Ted Kremenek | bdd30c2 | 2008-01-14 16:44:48 +0000 | [diff] [blame] | 141 | llvm::cerr << " [LeadingSpace]"; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 142 | if (Tok.isExpandDisabled()) |
Ted Kremenek | bdd30c2 | 2008-01-14 16:44:48 +0000 | [diff] [blame] | 143 | llvm::cerr << " [ExpandDisabled]"; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 144 | if (Tok.needsCleaning()) { |
| 145 | const char *Start = SourceMgr.getCharacterData(Tok.getLocation()); |
Ted Kremenek | bdd30c2 | 2008-01-14 16:44:48 +0000 | [diff] [blame] | 146 | llvm::cerr << " [UnClean='" << std::string(Start, Start+Tok.getLength()) |
| 147 | << "']"; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 148 | } |
Chris Lattner | c3d8d57 | 2007-12-09 20:31:55 +0000 | [diff] [blame] | 149 | |
Ted Kremenek | bdd30c2 | 2008-01-14 16:44:48 +0000 | [diff] [blame] | 150 | llvm::cerr << "\tLoc=<"; |
Chris Lattner | c3d8d57 | 2007-12-09 20:31:55 +0000 | [diff] [blame] | 151 | DumpLocation(Tok.getLocation()); |
Ted Kremenek | bdd30c2 | 2008-01-14 16:44:48 +0000 | [diff] [blame] | 152 | llvm::cerr << ">"; |
Chris Lattner | c3d8d57 | 2007-12-09 20:31:55 +0000 | [diff] [blame] | 153 | } |
| 154 | |
| 155 | void Preprocessor::DumpLocation(SourceLocation Loc) const { |
| 156 | SourceLocation LogLoc = SourceMgr.getLogicalLoc(Loc); |
Ted Kremenek | bdd30c2 | 2008-01-14 16:44:48 +0000 | [diff] [blame] | 157 | llvm::cerr << SourceMgr.getSourceName(LogLoc) << ':' |
| 158 | << SourceMgr.getLineNumber(LogLoc) << ':' |
| 159 | << SourceMgr.getLineNumber(LogLoc); |
Chris Lattner | c3d8d57 | 2007-12-09 20:31:55 +0000 | [diff] [blame] | 160 | |
| 161 | SourceLocation PhysLoc = SourceMgr.getPhysicalLoc(Loc); |
| 162 | if (PhysLoc != LogLoc) { |
Ted Kremenek | bdd30c2 | 2008-01-14 16:44:48 +0000 | [diff] [blame] | 163 | llvm::cerr << " <PhysLoc="; |
Chris Lattner | c3d8d57 | 2007-12-09 20:31:55 +0000 | [diff] [blame] | 164 | DumpLocation(PhysLoc); |
Ted Kremenek | bdd30c2 | 2008-01-14 16:44:48 +0000 | [diff] [blame] | 165 | llvm::cerr << ">"; |
Chris Lattner | c3d8d57 | 2007-12-09 20:31:55 +0000 | [diff] [blame] | 166 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 167 | } |
| 168 | |
| 169 | void Preprocessor::DumpMacro(const MacroInfo &MI) const { |
Ted Kremenek | bdd30c2 | 2008-01-14 16:44:48 +0000 | [diff] [blame] | 170 | llvm::cerr << "MACRO: "; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 171 | for (unsigned i = 0, e = MI.getNumTokens(); i != e; ++i) { |
| 172 | DumpToken(MI.getReplacementToken(i)); |
Ted Kremenek | bdd30c2 | 2008-01-14 16:44:48 +0000 | [diff] [blame] | 173 | llvm::cerr << " "; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 174 | } |
Ted Kremenek | bdd30c2 | 2008-01-14 16:44:48 +0000 | [diff] [blame] | 175 | llvm::cerr << "\n"; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 176 | } |
| 177 | |
| 178 | void Preprocessor::PrintStats() { |
Ted Kremenek | bdd30c2 | 2008-01-14 16:44:48 +0000 | [diff] [blame] | 179 | llvm::cerr << "\n*** Preprocessor Stats:\n"; |
| 180 | llvm::cerr << NumDirectives << " directives found:\n"; |
| 181 | llvm::cerr << " " << NumDefined << " #define.\n"; |
| 182 | llvm::cerr << " " << NumUndefined << " #undef.\n"; |
| 183 | llvm::cerr << " #include/#include_next/#import:\n"; |
| 184 | llvm::cerr << " " << NumEnteredSourceFiles << " source files entered.\n"; |
| 185 | llvm::cerr << " " << MaxIncludeStackDepth << " max include stack depth\n"; |
| 186 | llvm::cerr << " " << NumIf << " #if/#ifndef/#ifdef.\n"; |
| 187 | llvm::cerr << " " << NumElse << " #else/#elif.\n"; |
| 188 | llvm::cerr << " " << NumEndif << " #endif.\n"; |
| 189 | llvm::cerr << " " << NumPragma << " #pragma.\n"; |
| 190 | llvm::cerr << NumSkipped << " #if/#ifndef#ifdef regions skipped\n"; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 191 | |
Ted Kremenek | bdd30c2 | 2008-01-14 16:44:48 +0000 | [diff] [blame] | 192 | llvm::cerr << NumMacroExpanded << "/" << NumFnMacroExpanded << "/" |
| 193 | << NumBuiltinMacroExpanded << " obj/fn/builtin macros expanded, " |
| 194 | << NumFastMacroExpanded << " on the fast path.\n"; |
| 195 | llvm::cerr << (NumFastTokenPaste+NumTokenPaste) |
| 196 | << " token paste (##) operations performed, " |
| 197 | << NumFastTokenPaste << " on the fast path.\n"; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 198 | } |
| 199 | |
| 200 | //===----------------------------------------------------------------------===// |
| 201 | // Token Spelling |
| 202 | //===----------------------------------------------------------------------===// |
| 203 | |
| 204 | |
| 205 | /// getSpelling() - Return the 'spelling' of this token. The spelling of a |
| 206 | /// token are the characters used to represent the token in the source file |
| 207 | /// after trigraph expansion and escaped-newline folding. In particular, this |
| 208 | /// wants to get the true, uncanonicalized, spelling of things like digraphs |
| 209 | /// UCNs, etc. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 210 | std::string Preprocessor::getSpelling(const Token &Tok) const { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 211 | assert((int)Tok.getLength() >= 0 && "Token character range is bogus!"); |
| 212 | |
| 213 | // If this token contains nothing interesting, return it directly. |
| 214 | const char *TokStart = SourceMgr.getCharacterData(Tok.getLocation()); |
| 215 | if (!Tok.needsCleaning()) |
| 216 | return std::string(TokStart, TokStart+Tok.getLength()); |
| 217 | |
| 218 | std::string Result; |
| 219 | Result.reserve(Tok.getLength()); |
| 220 | |
| 221 | // Otherwise, hard case, relex the characters into the string. |
| 222 | for (const char *Ptr = TokStart, *End = TokStart+Tok.getLength(); |
| 223 | Ptr != End; ) { |
| 224 | unsigned CharSize; |
| 225 | Result.push_back(Lexer::getCharAndSizeNoWarn(Ptr, CharSize, Features)); |
| 226 | Ptr += CharSize; |
| 227 | } |
| 228 | assert(Result.size() != unsigned(Tok.getLength()) && |
| 229 | "NeedsCleaning flag set on something that didn't need cleaning!"); |
| 230 | return Result; |
| 231 | } |
| 232 | |
| 233 | /// getSpelling - This method is used to get the spelling of a token into a |
| 234 | /// preallocated buffer, instead of as an std::string. The caller is required |
| 235 | /// to allocate enough space for the token, which is guaranteed to be at least |
| 236 | /// Tok.getLength() bytes long. The actual length of the token is returned. |
| 237 | /// |
| 238 | /// Note that this method may do two possible things: it may either fill in |
| 239 | /// the buffer specified with characters, or it may *change the input pointer* |
| 240 | /// to point to a constant buffer with the data already in it (avoiding a |
| 241 | /// copy). The caller is not allowed to modify the returned buffer pointer |
| 242 | /// if an internal buffer is returned. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 243 | unsigned Preprocessor::getSpelling(const Token &Tok, |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 244 | const char *&Buffer) const { |
| 245 | assert((int)Tok.getLength() >= 0 && "Token character range is bogus!"); |
| 246 | |
| 247 | // If this token is an identifier, just return the string from the identifier |
| 248 | // table, which is very quick. |
| 249 | if (const IdentifierInfo *II = Tok.getIdentifierInfo()) { |
| 250 | Buffer = II->getName(); |
Chris Lattner | 0f67032 | 2007-07-22 22:50:09 +0000 | [diff] [blame] | 251 | |
| 252 | // Return the length of the token. If the token needed cleaning, don't |
| 253 | // include the size of the newlines or trigraphs in it. |
| 254 | if (!Tok.needsCleaning()) |
| 255 | return Tok.getLength(); |
| 256 | else |
| 257 | return strlen(Buffer); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 258 | } |
| 259 | |
| 260 | // Otherwise, compute the start of the token in the input lexer buffer. |
| 261 | const char *TokStart = SourceMgr.getCharacterData(Tok.getLocation()); |
| 262 | |
| 263 | // If this token contains nothing interesting, return it directly. |
| 264 | if (!Tok.needsCleaning()) { |
| 265 | Buffer = TokStart; |
| 266 | return Tok.getLength(); |
| 267 | } |
| 268 | // Otherwise, hard case, relex the characters into the string. |
| 269 | char *OutBuf = const_cast<char*>(Buffer); |
| 270 | for (const char *Ptr = TokStart, *End = TokStart+Tok.getLength(); |
| 271 | Ptr != End; ) { |
| 272 | unsigned CharSize; |
| 273 | *OutBuf++ = Lexer::getCharAndSizeNoWarn(Ptr, CharSize, Features); |
| 274 | Ptr += CharSize; |
| 275 | } |
| 276 | assert(unsigned(OutBuf-Buffer) != Tok.getLength() && |
| 277 | "NeedsCleaning flag set on something that didn't need cleaning!"); |
| 278 | |
| 279 | return OutBuf-Buffer; |
| 280 | } |
| 281 | |
| 282 | |
| 283 | /// CreateString - Plop the specified string into a scratch buffer and return a |
| 284 | /// location for it. If specified, the source location provides a source |
| 285 | /// location for the token. |
| 286 | SourceLocation Preprocessor:: |
| 287 | CreateString(const char *Buf, unsigned Len, SourceLocation SLoc) { |
| 288 | if (SLoc.isValid()) |
| 289 | return ScratchBuf->getToken(Buf, Len, SLoc); |
| 290 | return ScratchBuf->getToken(Buf, Len); |
| 291 | } |
| 292 | |
| 293 | |
Chris Lattner | 97ba77c | 2007-07-16 06:48:38 +0000 | [diff] [blame] | 294 | /// AdvanceToTokenCharacter - Given a location that specifies the start of a |
| 295 | /// token, return a new location that specifies a character within the token. |
| 296 | SourceLocation Preprocessor::AdvanceToTokenCharacter(SourceLocation TokStart, |
| 297 | unsigned CharNo) { |
Chris Lattner | 9dc1f53 | 2007-07-20 16:37:10 +0000 | [diff] [blame] | 298 | // If they request the first char of the token, we're trivially done. If this |
| 299 | // is a macro expansion, it doesn't make sense to point to a character within |
| 300 | // the instantiation point (the name). We could point to the source |
| 301 | // character, but without also pointing to instantiation info, this is |
| 302 | // confusing. |
| 303 | if (CharNo == 0 || TokStart.isMacroID()) return TokStart; |
Chris Lattner | 97ba77c | 2007-07-16 06:48:38 +0000 | [diff] [blame] | 304 | |
| 305 | // Figure out how many physical characters away the specified logical |
| 306 | // character is. This needs to take into consideration newlines and |
| 307 | // trigraphs. |
Chris Lattner | 9dc1f53 | 2007-07-20 16:37:10 +0000 | [diff] [blame] | 308 | const char *TokPtr = SourceMgr.getCharacterData(TokStart); |
| 309 | unsigned PhysOffset = 0; |
Chris Lattner | 97ba77c | 2007-07-16 06:48:38 +0000 | [diff] [blame] | 310 | |
| 311 | // The usual case is that tokens don't contain anything interesting. Skip |
| 312 | // over the uninteresting characters. If a token only consists of simple |
| 313 | // chars, this method is extremely fast. |
| 314 | while (CharNo && Lexer::isObviouslySimpleCharacter(*TokPtr)) |
Chris Lattner | 9dc1f53 | 2007-07-20 16:37:10 +0000 | [diff] [blame] | 315 | ++TokPtr, --CharNo, ++PhysOffset; |
Chris Lattner | 97ba77c | 2007-07-16 06:48:38 +0000 | [diff] [blame] | 316 | |
| 317 | // If we have a character that may be a trigraph or escaped newline, create a |
| 318 | // lexer to parse it correctly. |
Chris Lattner | 97ba77c | 2007-07-16 06:48:38 +0000 | [diff] [blame] | 319 | if (CharNo != 0) { |
| 320 | // Create a lexer starting at this token position. |
Chris Lattner | 25bdb51 | 2007-07-20 16:52:03 +0000 | [diff] [blame] | 321 | Lexer TheLexer(TokStart, *this, TokPtr); |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 322 | Token Tok; |
Chris Lattner | 97ba77c | 2007-07-16 06:48:38 +0000 | [diff] [blame] | 323 | // Skip over characters the remaining characters. |
Chris Lattner | 9dc1f53 | 2007-07-20 16:37:10 +0000 | [diff] [blame] | 324 | const char *TokStartPtr = TokPtr; |
Chris Lattner | 97ba77c | 2007-07-16 06:48:38 +0000 | [diff] [blame] | 325 | for (; CharNo; --CharNo) |
| 326 | TheLexer.getAndAdvanceChar(TokPtr, Tok); |
Chris Lattner | 9dc1f53 | 2007-07-20 16:37:10 +0000 | [diff] [blame] | 327 | |
| 328 | PhysOffset += TokPtr-TokStartPtr; |
Chris Lattner | 97ba77c | 2007-07-16 06:48:38 +0000 | [diff] [blame] | 329 | } |
Chris Lattner | 9dc1f53 | 2007-07-20 16:37:10 +0000 | [diff] [blame] | 330 | |
| 331 | return TokStart.getFileLocWithOffset(PhysOffset); |
Chris Lattner | 97ba77c | 2007-07-16 06:48:38 +0000 | [diff] [blame] | 332 | } |
| 333 | |
| 334 | |
Chris Lattner | 53b0dab | 2007-10-09 22:10:18 +0000 | [diff] [blame] | 335 | //===----------------------------------------------------------------------===// |
| 336 | // Preprocessor Initialization Methods |
| 337 | //===----------------------------------------------------------------------===// |
| 338 | |
| 339 | // Append a #define line to Buf for Macro. Macro should be of the form XXX, |
| 340 | // in which case we emit "#define XXX 1" or "XXX=Y z W" in which case we emit |
| 341 | // "#define XXX Y z W". To get a #define with no value, use "XXX=". |
| 342 | static void DefineBuiltinMacro(std::vector<char> &Buf, const char *Macro, |
| 343 | const char *Command = "#define ") { |
| 344 | Buf.insert(Buf.end(), Command, Command+strlen(Command)); |
| 345 | if (const char *Equal = strchr(Macro, '=')) { |
| 346 | // Turn the = into ' '. |
| 347 | Buf.insert(Buf.end(), Macro, Equal); |
| 348 | Buf.push_back(' '); |
| 349 | Buf.insert(Buf.end(), Equal+1, Equal+strlen(Equal)); |
| 350 | } else { |
| 351 | // Push "macroname 1". |
| 352 | Buf.insert(Buf.end(), Macro, Macro+strlen(Macro)); |
| 353 | Buf.push_back(' '); |
| 354 | Buf.push_back('1'); |
| 355 | } |
| 356 | Buf.push_back('\n'); |
| 357 | } |
| 358 | |
| 359 | |
| 360 | static void InitializePredefinedMacros(Preprocessor &PP, |
| 361 | std::vector<char> &Buf) { |
| 362 | // FIXME: Implement magic like cpp_init_builtins for things like __STDC__ |
| 363 | // and __DATE__ etc. |
| 364 | #if 0 |
| 365 | /* __STDC__ has the value 1 under normal circumstances. |
| 366 | However, if (a) we are in a system header, (b) the option |
| 367 | stdc_0_in_system_headers is true (set by target config), and |
| 368 | (c) we are not in strictly conforming mode, then it has the |
| 369 | value 0. (b) and (c) are already checked in cpp_init_builtins. */ |
| 370 | //case BT_STDC: |
| 371 | if (cpp_in_system_header (pfile)) |
| 372 | number = 0; |
| 373 | else |
| 374 | number = 1; |
| 375 | break; |
| 376 | #endif |
| 377 | // These should all be defined in the preprocessor according to the |
| 378 | // current language configuration. |
| 379 | DefineBuiltinMacro(Buf, "__STDC__=1"); |
| 380 | //DefineBuiltinMacro(Buf, "__ASSEMBLER__=1"); |
| 381 | if (PP.getLangOptions().C99 && !PP.getLangOptions().CPlusPlus) |
| 382 | DefineBuiltinMacro(Buf, "__STDC_VERSION__=199901L"); |
| 383 | else if (0) // STDC94 ? |
| 384 | DefineBuiltinMacro(Buf, "__STDC_VERSION__=199409L"); |
| 385 | |
| 386 | DefineBuiltinMacro(Buf, "__STDC_HOSTED__=1"); |
| 387 | if (PP.getLangOptions().ObjC1) |
| 388 | DefineBuiltinMacro(Buf, "__OBJC__=1"); |
| 389 | if (PP.getLangOptions().ObjC2) |
| 390 | DefineBuiltinMacro(Buf, "__OBJC2__=1"); |
Steve Naroff | 8ee529b | 2007-10-31 18:42:27 +0000 | [diff] [blame] | 391 | |
Chris Lattner | d19144b | 2007-10-10 17:48:53 +0000 | [diff] [blame] | 392 | // Add __builtin_va_list typedef. |
| 393 | { |
| 394 | const char *VAList = PP.getTargetInfo().getVAListDeclaration(); |
| 395 | Buf.insert(Buf.end(), VAList, VAList+strlen(VAList)); |
| 396 | Buf.push_back('\n'); |
| 397 | } |
Chris Lattner | 53b0dab | 2007-10-09 22:10:18 +0000 | [diff] [blame] | 398 | |
| 399 | // Get the target #defines. |
| 400 | PP.getTargetInfo().getTargetDefines(Buf); |
| 401 | |
| 402 | // Compiler set macros. |
| 403 | DefineBuiltinMacro(Buf, "__APPLE_CC__=5250"); |
Steve Naroff | 39d0a27 | 2007-11-10 18:06:36 +0000 | [diff] [blame] | 404 | DefineBuiltinMacro(Buf, "__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__=1050"); |
Chris Lattner | 53b0dab | 2007-10-09 22:10:18 +0000 | [diff] [blame] | 405 | DefineBuiltinMacro(Buf, "__GNUC_MINOR__=0"); |
| 406 | DefineBuiltinMacro(Buf, "__GNUC_PATCHLEVEL__=1"); |
| 407 | DefineBuiltinMacro(Buf, "__GNUC__=4"); |
| 408 | DefineBuiltinMacro(Buf, "__GXX_ABI_VERSION=1002"); |
| 409 | DefineBuiltinMacro(Buf, "__VERSION__=\"4.0.1 (Apple Computer, Inc. " |
| 410 | "build 5250)\""); |
| 411 | |
| 412 | // Build configuration options. |
| 413 | DefineBuiltinMacro(Buf, "__DYNAMIC__=1"); |
| 414 | DefineBuiltinMacro(Buf, "__FINITE_MATH_ONLY__=0"); |
| 415 | DefineBuiltinMacro(Buf, "__NO_INLINE__=1"); |
| 416 | DefineBuiltinMacro(Buf, "__PIC__=1"); |
| 417 | |
| 418 | |
| 419 | if (PP.getLangOptions().CPlusPlus) { |
| 420 | DefineBuiltinMacro(Buf, "__DEPRECATED=1"); |
| 421 | DefineBuiltinMacro(Buf, "__EXCEPTIONS=1"); |
| 422 | DefineBuiltinMacro(Buf, "__GNUG__=4"); |
| 423 | DefineBuiltinMacro(Buf, "__GXX_WEAK__=1"); |
| 424 | DefineBuiltinMacro(Buf, "__cplusplus=1"); |
| 425 | DefineBuiltinMacro(Buf, "__private_extern__=extern"); |
| 426 | } |
Steve Naroff | d62701b | 2008-02-07 03:50:06 +0000 | [diff] [blame] | 427 | if (PP.getLangOptions().Microsoft) { |
| 428 | DefineBuiltinMacro(Buf, "__stdcall="); |
| 429 | DefineBuiltinMacro(Buf, "__cdecl="); |
| 430 | DefineBuiltinMacro(Buf, "_cdecl="); |
| 431 | DefineBuiltinMacro(Buf, "__ptr64="); |
Steve Naroff | b746ce8 | 2008-02-07 23:24:32 +0000 | [diff] [blame] | 432 | DefineBuiltinMacro(Buf, "__w64="); |
Steve Naroff | d62701b | 2008-02-07 03:50:06 +0000 | [diff] [blame] | 433 | DefineBuiltinMacro(Buf, "__forceinline="); |
Steve Naroff | 419154d | 2008-02-07 15:26:07 +0000 | [diff] [blame] | 434 | DefineBuiltinMacro(Buf, "__int8=char"); |
| 435 | DefineBuiltinMacro(Buf, "__int16=short"); |
| 436 | DefineBuiltinMacro(Buf, "__int32=int"); |
Chris Lattner | 9880ba9 | 2008-02-10 21:12:45 +0000 | [diff] [blame] | 437 | DefineBuiltinMacro(Buf, "__int64=long long"); |
Steve Naroff | 705b5b5 | 2008-02-11 22:29:58 +0000 | [diff] [blame] | 438 | DefineBuiltinMacro(Buf, "__declspec(X)="); |
Steve Naroff | d62701b | 2008-02-07 03:50:06 +0000 | [diff] [blame] | 439 | } |
Chris Lattner | 53b0dab | 2007-10-09 22:10:18 +0000 | [diff] [blame] | 440 | // FIXME: Should emit a #line directive here. |
| 441 | } |
| 442 | |
| 443 | |
| 444 | /// EnterMainSourceFile - Enter the specified FileID as the main source file, |
Nate Begeman | 6b61602 | 2008-01-07 04:01:26 +0000 | [diff] [blame] | 445 | /// which implicitly adds the builtin defines etc. |
Ted Kremenek | 95041a2 | 2007-12-19 22:51:13 +0000 | [diff] [blame] | 446 | void Preprocessor::EnterMainSourceFile() { |
| 447 | |
| 448 | unsigned MainFileID = SourceMgr.getMainFileID(); |
| 449 | |
Chris Lattner | 53b0dab | 2007-10-09 22:10:18 +0000 | [diff] [blame] | 450 | // Enter the main file source buffer. |
| 451 | EnterSourceFile(MainFileID, 0); |
| 452 | |
Chris Lattner | b283298 | 2007-11-15 19:07:47 +0000 | [diff] [blame] | 453 | // Tell the header info that the main file was entered. If the file is later |
| 454 | // #imported, it won't be re-entered. |
| 455 | if (const FileEntry *FE = |
| 456 | SourceMgr.getFileEntryForLoc(SourceLocation::getFileLoc(MainFileID, 0))) |
| 457 | HeaderInfo.IncrementIncludeCount(FE); |
| 458 | |
Chris Lattner | 53b0dab | 2007-10-09 22:10:18 +0000 | [diff] [blame] | 459 | std::vector<char> PrologFile; |
| 460 | PrologFile.reserve(4080); |
| 461 | |
| 462 | // Install things like __POWERPC__, __GNUC__, etc into the macro table. |
| 463 | InitializePredefinedMacros(*this, PrologFile); |
| 464 | |
| 465 | // Add on the predefines from the driver. |
| 466 | PrologFile.insert(PrologFile.end(), Predefines,Predefines+strlen(Predefines)); |
| 467 | |
| 468 | // Memory buffer must end with a null byte! |
| 469 | PrologFile.push_back(0); |
| 470 | |
| 471 | // Now that we have emitted the predefined macros, #includes, etc into |
| 472 | // PrologFile, preprocess it to populate the initial preprocessor state. |
| 473 | llvm::MemoryBuffer *SB = |
| 474 | llvm::MemoryBuffer::getMemBufferCopy(&PrologFile.front(),&PrologFile.back(), |
| 475 | "<predefines>"); |
| 476 | assert(SB && "Cannot fail to create predefined source buffer"); |
| 477 | unsigned FileID = SourceMgr.createFileIDForMemBuffer(SB); |
| 478 | assert(FileID && "Could not create FileID for predefines?"); |
| 479 | |
| 480 | // Start parsing the predefines. |
| 481 | EnterSourceFile(FileID, 0); |
| 482 | } |
Chris Lattner | 97ba77c | 2007-07-16 06:48:38 +0000 | [diff] [blame] | 483 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 484 | //===----------------------------------------------------------------------===// |
| 485 | // Source File Location Methods. |
| 486 | //===----------------------------------------------------------------------===// |
| 487 | |
| 488 | /// LookupFile - Given a "foo" or <foo> reference, look up the indicated file, |
| 489 | /// return null on failure. isAngled indicates whether the file reference is |
| 490 | /// for system #include's or not (i.e. using <> instead of ""). |
| 491 | const FileEntry *Preprocessor::LookupFile(const char *FilenameStart, |
| 492 | const char *FilenameEnd, |
| 493 | bool isAngled, |
| 494 | const DirectoryLookup *FromDir, |
| 495 | const DirectoryLookup *&CurDir) { |
| 496 | // If the header lookup mechanism may be relative to the current file, pass in |
| 497 | // info about where the current file is. |
| 498 | const FileEntry *CurFileEnt = 0; |
| 499 | if (!FromDir) { |
Chris Lattner | 9dc1f53 | 2007-07-20 16:37:10 +0000 | [diff] [blame] | 500 | SourceLocation FileLoc = getCurrentFileLexer()->getFileLoc(); |
| 501 | CurFileEnt = SourceMgr.getFileEntryForLoc(FileLoc); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 502 | } |
| 503 | |
| 504 | // Do a standard file entry lookup. |
| 505 | CurDir = CurDirLookup; |
| 506 | const FileEntry *FE = |
| 507 | HeaderInfo.LookupFile(FilenameStart, FilenameEnd, |
| 508 | isAngled, FromDir, CurDir, CurFileEnt); |
| 509 | if (FE) return FE; |
| 510 | |
| 511 | // Otherwise, see if this is a subframework header. If so, this is relative |
| 512 | // to one of the headers on the #include stack. Walk the list of the current |
| 513 | // headers on the #include stack and pass them to HeaderInfo. |
| 514 | if (CurLexer && !CurLexer->Is_PragmaLexer) { |
Chris Lattner | 9415a0c | 2008-02-01 05:34:02 +0000 | [diff] [blame] | 515 | if ((CurFileEnt = SourceMgr.getFileEntryForLoc(CurLexer->getFileLoc()))) |
| 516 | if ((FE = HeaderInfo.LookupSubframeworkHeader(FilenameStart, FilenameEnd, |
| 517 | CurFileEnt))) |
| 518 | return FE; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 519 | } |
| 520 | |
| 521 | for (unsigned i = 0, e = IncludeMacroStack.size(); i != e; ++i) { |
| 522 | IncludeStackInfo &ISEntry = IncludeMacroStack[e-i-1]; |
| 523 | if (ISEntry.TheLexer && !ISEntry.TheLexer->Is_PragmaLexer) { |
Chris Lattner | 9415a0c | 2008-02-01 05:34:02 +0000 | [diff] [blame] | 524 | if ((CurFileEnt = |
| 525 | SourceMgr.getFileEntryForLoc(ISEntry.TheLexer->getFileLoc()))) |
| 526 | if ((FE = HeaderInfo.LookupSubframeworkHeader(FilenameStart, |
| 527 | FilenameEnd, CurFileEnt))) |
| 528 | return FE; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 529 | } |
| 530 | } |
| 531 | |
| 532 | // Otherwise, we really couldn't find the file. |
| 533 | return 0; |
| 534 | } |
| 535 | |
| 536 | /// isInPrimaryFile - Return true if we're in the top-level file, not in a |
| 537 | /// #include. |
| 538 | bool Preprocessor::isInPrimaryFile() const { |
| 539 | if (CurLexer && !CurLexer->Is_PragmaLexer) |
Chris Lattner | 53b0dab | 2007-10-09 22:10:18 +0000 | [diff] [blame] | 540 | return IncludeMacroStack.empty(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 541 | |
| 542 | // If there are any stacked lexers, we're in a #include. |
Chris Lattner | 53b0dab | 2007-10-09 22:10:18 +0000 | [diff] [blame] | 543 | assert(IncludeMacroStack[0].TheLexer && |
| 544 | !IncludeMacroStack[0].TheLexer->Is_PragmaLexer && |
| 545 | "Top level include stack isn't our primary lexer?"); |
| 546 | for (unsigned i = 1, e = IncludeMacroStack.size(); i != e; ++i) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 547 | if (IncludeMacroStack[i].TheLexer && |
| 548 | !IncludeMacroStack[i].TheLexer->Is_PragmaLexer) |
Chris Lattner | 53b0dab | 2007-10-09 22:10:18 +0000 | [diff] [blame] | 549 | return false; |
| 550 | return true; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 551 | } |
| 552 | |
| 553 | /// getCurrentLexer - Return the current file lexer being lexed from. Note |
| 554 | /// that this ignores any potentially active macro expansions and _Pragma |
| 555 | /// expansions going on at the time. |
| 556 | Lexer *Preprocessor::getCurrentFileLexer() const { |
| 557 | if (CurLexer && !CurLexer->Is_PragmaLexer) return CurLexer; |
| 558 | |
| 559 | // Look for a stacked lexer. |
| 560 | for (unsigned i = IncludeMacroStack.size(); i != 0; --i) { |
| 561 | Lexer *L = IncludeMacroStack[i-1].TheLexer; |
| 562 | if (L && !L->Is_PragmaLexer) // Ignore macro & _Pragma expansions. |
| 563 | return L; |
| 564 | } |
| 565 | return 0; |
| 566 | } |
| 567 | |
| 568 | |
| 569 | /// EnterSourceFile - Add a source file to the top of the include stack and |
| 570 | /// start lexing tokens from it instead of the current buffer. Return true |
| 571 | /// on failure. |
| 572 | void Preprocessor::EnterSourceFile(unsigned FileID, |
Chris Lattner | 53b0dab | 2007-10-09 22:10:18 +0000 | [diff] [blame] | 573 | const DirectoryLookup *CurDir) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 574 | assert(CurMacroExpander == 0 && "Cannot #include a file inside a macro!"); |
| 575 | ++NumEnteredSourceFiles; |
| 576 | |
| 577 | if (MaxIncludeStackDepth < IncludeMacroStack.size()) |
| 578 | MaxIncludeStackDepth = IncludeMacroStack.size(); |
| 579 | |
Chris Lattner | 25bdb51 | 2007-07-20 16:52:03 +0000 | [diff] [blame] | 580 | Lexer *TheLexer = new Lexer(SourceLocation::getFileLoc(FileID, 0), *this); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 581 | EnterSourceFileWithLexer(TheLexer, CurDir); |
| 582 | } |
| 583 | |
| 584 | /// EnterSourceFile - Add a source file to the top of the include stack and |
| 585 | /// start lexing tokens from it instead of the current buffer. |
| 586 | void Preprocessor::EnterSourceFileWithLexer(Lexer *TheLexer, |
| 587 | const DirectoryLookup *CurDir) { |
| 588 | |
| 589 | // Add the current lexer to the include stack. |
| 590 | if (CurLexer || CurMacroExpander) |
| 591 | IncludeMacroStack.push_back(IncludeStackInfo(CurLexer, CurDirLookup, |
| 592 | CurMacroExpander)); |
| 593 | |
| 594 | CurLexer = TheLexer; |
| 595 | CurDirLookup = CurDir; |
| 596 | CurMacroExpander = 0; |
| 597 | |
| 598 | // Notify the client, if desired, that we are in a new source file. |
| 599 | if (Callbacks && !CurLexer->Is_PragmaLexer) { |
| 600 | DirectoryLookup::DirType FileType = DirectoryLookup::NormalHeaderDir; |
| 601 | |
| 602 | // Get the file entry for the current file. |
| 603 | if (const FileEntry *FE = |
Chris Lattner | 9dc1f53 | 2007-07-20 16:37:10 +0000 | [diff] [blame] | 604 | SourceMgr.getFileEntryForLoc(CurLexer->getFileLoc())) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 605 | FileType = HeaderInfo.getFileDirFlavor(FE); |
| 606 | |
Chris Lattner | 9dc1f53 | 2007-07-20 16:37:10 +0000 | [diff] [blame] | 607 | Callbacks->FileChanged(CurLexer->getFileLoc(), |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 608 | PPCallbacks::EnterFile, FileType); |
| 609 | } |
| 610 | } |
| 611 | |
| 612 | |
| 613 | |
| 614 | /// EnterMacro - Add a Macro to the top of the include stack and start lexing |
| 615 | /// tokens from it instead of the current buffer. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 616 | void Preprocessor::EnterMacro(Token &Tok, MacroArgs *Args) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 617 | IncludeMacroStack.push_back(IncludeStackInfo(CurLexer, CurDirLookup, |
| 618 | CurMacroExpander)); |
| 619 | CurLexer = 0; |
| 620 | CurDirLookup = 0; |
| 621 | |
Chris Lattner | 9594acf | 2007-07-15 00:25:26 +0000 | [diff] [blame] | 622 | if (NumCachedMacroExpanders == 0) { |
| 623 | CurMacroExpander = new MacroExpander(Tok, Args, *this); |
| 624 | } else { |
| 625 | CurMacroExpander = MacroExpanderCache[--NumCachedMacroExpanders]; |
| 626 | CurMacroExpander->Init(Tok, Args); |
| 627 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 628 | } |
| 629 | |
| 630 | /// EnterTokenStream - Add a "macro" context to the top of the include stack, |
| 631 | /// which will cause the lexer to start returning the specified tokens. Note |
| 632 | /// that these tokens will be re-macro-expanded when/if expansion is enabled. |
| 633 | /// This method assumes that the specified stream of tokens has a permanent |
| 634 | /// owner somewhere, so they do not need to be copied. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 635 | void Preprocessor::EnterTokenStream(const Token *Toks, unsigned NumToks) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 636 | // Save our current state. |
| 637 | IncludeMacroStack.push_back(IncludeStackInfo(CurLexer, CurDirLookup, |
| 638 | CurMacroExpander)); |
| 639 | CurLexer = 0; |
| 640 | CurDirLookup = 0; |
| 641 | |
| 642 | // Create a macro expander to expand from the specified token stream. |
Chris Lattner | 9594acf | 2007-07-15 00:25:26 +0000 | [diff] [blame] | 643 | if (NumCachedMacroExpanders == 0) { |
| 644 | CurMacroExpander = new MacroExpander(Toks, NumToks, *this); |
| 645 | } else { |
| 646 | CurMacroExpander = MacroExpanderCache[--NumCachedMacroExpanders]; |
| 647 | CurMacroExpander->Init(Toks, NumToks); |
| 648 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 649 | } |
| 650 | |
| 651 | /// RemoveTopOfLexerStack - Pop the current lexer/macro exp off the top of the |
| 652 | /// lexer stack. This should only be used in situations where the current |
| 653 | /// state of the top-of-stack lexer is known. |
| 654 | void Preprocessor::RemoveTopOfLexerStack() { |
| 655 | assert(!IncludeMacroStack.empty() && "Ran out of stack entries to load"); |
Chris Lattner | 9594acf | 2007-07-15 00:25:26 +0000 | [diff] [blame] | 656 | |
| 657 | if (CurMacroExpander) { |
| 658 | // Delete or cache the now-dead macro expander. |
| 659 | if (NumCachedMacroExpanders == MacroExpanderCacheSize) |
| 660 | delete CurMacroExpander; |
| 661 | else |
| 662 | MacroExpanderCache[NumCachedMacroExpanders++] = CurMacroExpander; |
| 663 | } else { |
| 664 | delete CurLexer; |
| 665 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 666 | CurLexer = IncludeMacroStack.back().TheLexer; |
| 667 | CurDirLookup = IncludeMacroStack.back().TheDirLookup; |
| 668 | CurMacroExpander = IncludeMacroStack.back().TheMacroExpander; |
| 669 | IncludeMacroStack.pop_back(); |
| 670 | } |
| 671 | |
| 672 | //===----------------------------------------------------------------------===// |
| 673 | // Macro Expansion Handling. |
| 674 | //===----------------------------------------------------------------------===// |
| 675 | |
Chris Lattner | cc1a875 | 2007-10-07 08:44:20 +0000 | [diff] [blame] | 676 | /// setMacroInfo - Specify a macro for this identifier. |
| 677 | /// |
| 678 | void Preprocessor::setMacroInfo(IdentifierInfo *II, MacroInfo *MI) { |
| 679 | if (MI == 0) { |
| 680 | if (II->hasMacroDefinition()) { |
| 681 | Macros.erase(II); |
| 682 | II->setHasMacroDefinition(false); |
| 683 | } |
| 684 | } else { |
| 685 | Macros[II] = MI; |
| 686 | II->setHasMacroDefinition(true); |
| 687 | } |
| 688 | } |
| 689 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 690 | /// RegisterBuiltinMacro - Register the specified identifier in the identifier |
| 691 | /// table and mark it as a builtin macro to be expanded. |
| 692 | IdentifierInfo *Preprocessor::RegisterBuiltinMacro(const char *Name) { |
| 693 | // Get the identifier. |
| 694 | IdentifierInfo *Id = getIdentifierInfo(Name); |
| 695 | |
| 696 | // Mark it as being a macro that is builtin. |
| 697 | MacroInfo *MI = new MacroInfo(SourceLocation()); |
| 698 | MI->setIsBuiltinMacro(); |
Chris Lattner | cc1a875 | 2007-10-07 08:44:20 +0000 | [diff] [blame] | 699 | setMacroInfo(Id, MI); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 700 | return Id; |
| 701 | } |
| 702 | |
| 703 | |
| 704 | /// RegisterBuiltinMacros - Register builtin macros, such as __LINE__ with the |
| 705 | /// identifier table. |
| 706 | void Preprocessor::RegisterBuiltinMacros() { |
| 707 | Ident__LINE__ = RegisterBuiltinMacro("__LINE__"); |
| 708 | Ident__FILE__ = RegisterBuiltinMacro("__FILE__"); |
| 709 | Ident__DATE__ = RegisterBuiltinMacro("__DATE__"); |
| 710 | Ident__TIME__ = RegisterBuiltinMacro("__TIME__"); |
| 711 | Ident_Pragma = RegisterBuiltinMacro("_Pragma"); |
| 712 | |
| 713 | // GCC Extensions. |
| 714 | Ident__BASE_FILE__ = RegisterBuiltinMacro("__BASE_FILE__"); |
| 715 | Ident__INCLUDE_LEVEL__ = RegisterBuiltinMacro("__INCLUDE_LEVEL__"); |
| 716 | Ident__TIMESTAMP__ = RegisterBuiltinMacro("__TIMESTAMP__"); |
| 717 | } |
| 718 | |
| 719 | /// isTrivialSingleTokenExpansion - Return true if MI, which has a single token |
| 720 | /// in its expansion, currently expands to that token literally. |
| 721 | static bool isTrivialSingleTokenExpansion(const MacroInfo *MI, |
Chris Lattner | cc1a875 | 2007-10-07 08:44:20 +0000 | [diff] [blame] | 722 | const IdentifierInfo *MacroIdent, |
| 723 | Preprocessor &PP) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 724 | IdentifierInfo *II = MI->getReplacementToken(0).getIdentifierInfo(); |
| 725 | |
| 726 | // If the token isn't an identifier, it's always literally expanded. |
| 727 | if (II == 0) return true; |
| 728 | |
| 729 | // If the identifier is a macro, and if that macro is enabled, it may be |
| 730 | // expanded so it's not a trivial expansion. |
Chris Lattner | cc1a875 | 2007-10-07 08:44:20 +0000 | [diff] [blame] | 731 | if (II->hasMacroDefinition() && PP.getMacroInfo(II)->isEnabled() && |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 732 | // Fast expanding "#define X X" is ok, because X would be disabled. |
| 733 | II != MacroIdent) |
| 734 | return false; |
| 735 | |
| 736 | // If this is an object-like macro invocation, it is safe to trivially expand |
| 737 | // it. |
| 738 | if (MI->isObjectLike()) return true; |
| 739 | |
| 740 | // If this is a function-like macro invocation, it's safe to trivially expand |
| 741 | // as long as the identifier is not a macro argument. |
| 742 | for (MacroInfo::arg_iterator I = MI->arg_begin(), E = MI->arg_end(); |
| 743 | I != E; ++I) |
| 744 | if (*I == II) |
| 745 | return false; // Identifier is a macro argument. |
| 746 | |
| 747 | return true; |
| 748 | } |
| 749 | |
| 750 | |
| 751 | /// isNextPPTokenLParen - Determine whether the next preprocessor token to be |
| 752 | /// lexed is a '('. If so, consume the token and return true, if not, this |
| 753 | /// method should have no observable side-effect on the lexed tokens. |
| 754 | bool Preprocessor::isNextPPTokenLParen() { |
| 755 | // Do some quick tests for rejection cases. |
| 756 | unsigned Val; |
| 757 | if (CurLexer) |
| 758 | Val = CurLexer->isNextPPTokenLParen(); |
| 759 | else |
| 760 | Val = CurMacroExpander->isNextTokenLParen(); |
| 761 | |
| 762 | if (Val == 2) { |
Chris Lattner | 0ea793e | 2007-07-19 00:07:36 +0000 | [diff] [blame] | 763 | // We have run off the end. If it's a source file we don't |
| 764 | // examine enclosing ones (C99 5.1.1.2p4). Otherwise walk up the |
| 765 | // macro stack. |
| 766 | if (CurLexer) |
| 767 | return false; |
| 768 | for (unsigned i = IncludeMacroStack.size(); i != 0; --i) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 769 | IncludeStackInfo &Entry = IncludeMacroStack[i-1]; |
| 770 | if (Entry.TheLexer) |
| 771 | Val = Entry.TheLexer->isNextPPTokenLParen(); |
| 772 | else |
| 773 | Val = Entry.TheMacroExpander->isNextTokenLParen(); |
Chris Lattner | 0ea793e | 2007-07-19 00:07:36 +0000 | [diff] [blame] | 774 | |
| 775 | if (Val != 2) |
| 776 | break; |
| 777 | |
| 778 | // Ran off the end of a source file? |
| 779 | if (Entry.TheLexer) |
| 780 | return false; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 781 | } |
| 782 | } |
| 783 | |
| 784 | // Okay, if we know that the token is a '(', lex it and return. Otherwise we |
| 785 | // have found something that isn't a '(' or we found the end of the |
| 786 | // translation unit. In either case, return false. |
| 787 | if (Val != 1) |
| 788 | return false; |
| 789 | |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 790 | Token Tok; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 791 | LexUnexpandedToken(Tok); |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 792 | assert(Tok.is(tok::l_paren) && "Error computing l-paren-ness?"); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 793 | return true; |
| 794 | } |
| 795 | |
| 796 | /// HandleMacroExpandedIdentifier - If an identifier token is read that is to be |
| 797 | /// expanded as a macro, handle it and return the next token as 'Identifier'. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 798 | bool Preprocessor::HandleMacroExpandedIdentifier(Token &Identifier, |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 799 | MacroInfo *MI) { |
Chris Lattner | 4d73046 | 2008-01-07 19:50:27 +0000 | [diff] [blame] | 800 | // If this is a macro exapnsion in the "#if !defined(x)" line for the file, |
| 801 | // then the macro could expand to different things in other contexts, we need |
| 802 | // to disable the optimization in this case. |
| 803 | if (CurLexer) CurLexer->MIOpt.ExpandedMacro(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 804 | |
| 805 | // If this is a builtin macro, like __LINE__ or _Pragma, handle it specially. |
| 806 | if (MI->isBuiltinMacro()) { |
| 807 | ExpandBuiltinMacro(Identifier); |
| 808 | return false; |
| 809 | } |
| 810 | |
| 811 | // If this is the first use of a target-specific macro, warn about it. |
| 812 | if (MI->isTargetSpecific()) { |
| 813 | MI->setIsTargetSpecific(false); // Don't warn on second use. |
Ted Kremenek | 9c728dc | 2007-12-12 22:39:36 +0000 | [diff] [blame] | 814 | getTargetInfo().DiagnoseNonPortability(getFullLoc(Identifier.getLocation()), |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 815 | diag::port_target_macro_use); |
| 816 | } |
| 817 | |
| 818 | /// Args - If this is a function-like macro expansion, this contains, |
| 819 | /// for each macro argument, the list of tokens that were provided to the |
| 820 | /// invocation. |
| 821 | MacroArgs *Args = 0; |
| 822 | |
| 823 | // If this is a function-like macro, read the arguments. |
| 824 | if (MI->isFunctionLike()) { |
| 825 | // C99 6.10.3p10: If the preprocessing token immediately after the the macro |
Chris Lattner | 2b64fdc | 2007-07-19 16:11:58 +0000 | [diff] [blame] | 826 | // name isn't a '(', this macro should not be expanded. Otherwise, consume |
| 827 | // it. |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 828 | if (!isNextPPTokenLParen()) |
| 829 | return true; |
| 830 | |
| 831 | // Remember that we are now parsing the arguments to a macro invocation. |
| 832 | // Preprocessor directives used inside macro arguments are not portable, and |
| 833 | // this enables the warning. |
| 834 | InMacroArgs = true; |
| 835 | Args = ReadFunctionLikeMacroArgs(Identifier, MI); |
| 836 | |
| 837 | // Finished parsing args. |
| 838 | InMacroArgs = false; |
| 839 | |
| 840 | // If there was an error parsing the arguments, bail out. |
| 841 | if (Args == 0) return false; |
| 842 | |
| 843 | ++NumFnMacroExpanded; |
| 844 | } else { |
| 845 | ++NumMacroExpanded; |
| 846 | } |
| 847 | |
| 848 | // Notice that this macro has been used. |
| 849 | MI->setIsUsed(true); |
| 850 | |
| 851 | // If we started lexing a macro, enter the macro expansion body. |
| 852 | |
| 853 | // If this macro expands to no tokens, don't bother to push it onto the |
| 854 | // expansion stack, only to take it right back off. |
| 855 | if (MI->getNumTokens() == 0) { |
| 856 | // No need for arg info. |
| 857 | if (Args) Args->destroy(); |
| 858 | |
| 859 | // Ignore this macro use, just return the next token in the current |
| 860 | // buffer. |
| 861 | bool HadLeadingSpace = Identifier.hasLeadingSpace(); |
| 862 | bool IsAtStartOfLine = Identifier.isAtStartOfLine(); |
| 863 | |
| 864 | Lex(Identifier); |
| 865 | |
| 866 | // If the identifier isn't on some OTHER line, inherit the leading |
| 867 | // whitespace/first-on-a-line property of this token. This handles |
| 868 | // stuff like "! XX," -> "! ," and " XX," -> " ,", when XX is |
| 869 | // empty. |
| 870 | if (!Identifier.isAtStartOfLine()) { |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 871 | if (IsAtStartOfLine) Identifier.setFlag(Token::StartOfLine); |
| 872 | if (HadLeadingSpace) Identifier.setFlag(Token::LeadingSpace); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 873 | } |
| 874 | ++NumFastMacroExpanded; |
| 875 | return false; |
| 876 | |
| 877 | } else if (MI->getNumTokens() == 1 && |
Chris Lattner | cc1a875 | 2007-10-07 08:44:20 +0000 | [diff] [blame] | 878 | isTrivialSingleTokenExpansion(MI, Identifier.getIdentifierInfo(), |
| 879 | *this)){ |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 880 | // Otherwise, if this macro expands into a single trivially-expanded |
| 881 | // token: expand it now. This handles common cases like |
| 882 | // "#define VAL 42". |
| 883 | |
| 884 | // Propagate the isAtStartOfLine/hasLeadingSpace markers of the macro |
| 885 | // identifier to the expanded token. |
| 886 | bool isAtStartOfLine = Identifier.isAtStartOfLine(); |
| 887 | bool hasLeadingSpace = Identifier.hasLeadingSpace(); |
| 888 | |
| 889 | // Remember where the token is instantiated. |
| 890 | SourceLocation InstantiateLoc = Identifier.getLocation(); |
| 891 | |
| 892 | // Replace the result token. |
| 893 | Identifier = MI->getReplacementToken(0); |
| 894 | |
| 895 | // Restore the StartOfLine/LeadingSpace markers. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 896 | Identifier.setFlagValue(Token::StartOfLine , isAtStartOfLine); |
| 897 | Identifier.setFlagValue(Token::LeadingSpace, hasLeadingSpace); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 898 | |
| 899 | // Update the tokens location to include both its logical and physical |
| 900 | // locations. |
| 901 | SourceLocation Loc = |
| 902 | SourceMgr.getInstantiationLoc(Identifier.getLocation(), InstantiateLoc); |
| 903 | Identifier.setLocation(Loc); |
| 904 | |
| 905 | // If this is #define X X, we must mark the result as unexpandible. |
| 906 | if (IdentifierInfo *NewII = Identifier.getIdentifierInfo()) |
Chris Lattner | cc1a875 | 2007-10-07 08:44:20 +0000 | [diff] [blame] | 907 | if (getMacroInfo(NewII) == MI) |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 908 | Identifier.setFlag(Token::DisableExpand); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 909 | |
| 910 | // Since this is not an identifier token, it can't be macro expanded, so |
| 911 | // we're done. |
| 912 | ++NumFastMacroExpanded; |
| 913 | return false; |
| 914 | } |
| 915 | |
| 916 | // Start expanding the macro. |
| 917 | EnterMacro(Identifier, Args); |
| 918 | |
| 919 | // Now that the macro is at the top of the include stack, ask the |
| 920 | // preprocessor to read the next token from it. |
| 921 | Lex(Identifier); |
| 922 | return false; |
| 923 | } |
| 924 | |
| 925 | /// ReadFunctionLikeMacroArgs - After reading "MACRO(", this method is |
| 926 | /// invoked to read all of the actual arguments specified for the macro |
| 927 | /// invocation. This returns null on error. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 928 | MacroArgs *Preprocessor::ReadFunctionLikeMacroArgs(Token &MacroName, |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 929 | MacroInfo *MI) { |
| 930 | // The number of fixed arguments to parse. |
| 931 | unsigned NumFixedArgsLeft = MI->getNumArgs(); |
| 932 | bool isVariadic = MI->isVariadic(); |
| 933 | |
| 934 | // Outer loop, while there are more arguments, keep reading them. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 935 | Token Tok; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 936 | Tok.setKind(tok::comma); |
| 937 | --NumFixedArgsLeft; // Start reading the first arg. |
| 938 | |
| 939 | // ArgTokens - Build up a list of tokens that make up each argument. Each |
| 940 | // argument is separated by an EOF token. Use a SmallVector so we can avoid |
| 941 | // heap allocations in the common case. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 942 | llvm::SmallVector<Token, 64> ArgTokens; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 943 | |
| 944 | unsigned NumActuals = 0; |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 945 | while (Tok.is(tok::comma)) { |
Chris Lattner | 2b64fdc | 2007-07-19 16:11:58 +0000 | [diff] [blame] | 946 | // C99 6.10.3p11: Keep track of the number of l_parens we have seen. Note |
| 947 | // that we already consumed the first one. |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 948 | unsigned NumParens = 0; |
| 949 | |
| 950 | while (1) { |
| 951 | // Read arguments as unexpanded tokens. This avoids issues, e.g., where |
| 952 | // an argument value in a macro could expand to ',' or '(' or ')'. |
| 953 | LexUnexpandedToken(Tok); |
| 954 | |
Chris Lattner | c21d9e4 | 2008-01-22 19:34:51 +0000 | [diff] [blame] | 955 | if (Tok.is(tok::eof) || Tok.is(tok::eom)) { // "#if f(<eof>" & "#if f(\n" |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 956 | Diag(MacroName, diag::err_unterm_macro_invoc); |
Chris Lattner | c21d9e4 | 2008-01-22 19:34:51 +0000 | [diff] [blame] | 957 | // Do not lose the EOF/EOM. Return it to the client. |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 958 | MacroName = Tok; |
| 959 | return 0; |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 960 | } else if (Tok.is(tok::r_paren)) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 961 | // If we found the ) token, the macro arg list is done. |
| 962 | if (NumParens-- == 0) |
| 963 | break; |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 964 | } else if (Tok.is(tok::l_paren)) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 965 | ++NumParens; |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 966 | } else if (Tok.is(tok::comma) && NumParens == 0) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 967 | // Comma ends this argument if there are more fixed arguments expected. |
| 968 | if (NumFixedArgsLeft) |
| 969 | break; |
| 970 | |
| 971 | // If this is not a variadic macro, too many args were specified. |
| 972 | if (!isVariadic) { |
| 973 | // Emit the diagnostic at the macro name in case there is a missing ). |
| 974 | // Emitting it at the , could be far away from the macro name. |
| 975 | Diag(MacroName, diag::err_too_many_args_in_macro_invoc); |
| 976 | return 0; |
| 977 | } |
| 978 | // Otherwise, continue to add the tokens to this variable argument. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 979 | } else if (Tok.is(tok::comment) && !KeepMacroComments) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 980 | // If this is a comment token in the argument list and we're just in |
| 981 | // -C mode (not -CC mode), discard the comment. |
| 982 | continue; |
Chris Lattner | 0c3eb29 | 2007-11-23 06:50:21 +0000 | [diff] [blame] | 983 | } else if (Tok.is(tok::identifier)) { |
| 984 | // Reading macro arguments can cause macros that we are currently |
| 985 | // expanding from to be popped off the expansion stack. Doing so causes |
| 986 | // them to be reenabled for expansion. Here we record whether any |
| 987 | // identifiers we lex as macro arguments correspond to disabled macros. |
| 988 | // If so, we mark the token as noexpand. This is a subtle aspect of |
| 989 | // C99 6.10.3.4p2. |
| 990 | if (MacroInfo *MI = getMacroInfo(Tok.getIdentifierInfo())) |
| 991 | if (!MI->isEnabled()) |
| 992 | Tok.setFlag(Token::DisableExpand); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 993 | } |
| 994 | |
| 995 | ArgTokens.push_back(Tok); |
| 996 | } |
| 997 | |
| 998 | // Empty arguments are standard in C99 and supported as an extension in |
| 999 | // other modes. |
| 1000 | if (ArgTokens.empty() && !Features.C99) |
| 1001 | Diag(Tok, diag::ext_empty_fnmacro_arg); |
| 1002 | |
| 1003 | // Add a marker EOF token to the end of the token list for this argument. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 1004 | Token EOFTok; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1005 | EOFTok.startToken(); |
| 1006 | EOFTok.setKind(tok::eof); |
| 1007 | EOFTok.setLocation(Tok.getLocation()); |
| 1008 | EOFTok.setLength(0); |
| 1009 | ArgTokens.push_back(EOFTok); |
| 1010 | ++NumActuals; |
| 1011 | --NumFixedArgsLeft; |
| 1012 | }; |
| 1013 | |
| 1014 | // Okay, we either found the r_paren. Check to see if we parsed too few |
| 1015 | // arguments. |
| 1016 | unsigned MinArgsExpected = MI->getNumArgs(); |
| 1017 | |
| 1018 | // See MacroArgs instance var for description of this. |
| 1019 | bool isVarargsElided = false; |
| 1020 | |
| 1021 | if (NumActuals < MinArgsExpected) { |
| 1022 | // There are several cases where too few arguments is ok, handle them now. |
| 1023 | if (NumActuals+1 == MinArgsExpected && MI->isVariadic()) { |
| 1024 | // Varargs where the named vararg parameter is missing: ok as extension. |
| 1025 | // #define A(x, ...) |
| 1026 | // A("blah") |
| 1027 | Diag(Tok, diag::ext_missing_varargs_arg); |
| 1028 | |
| 1029 | // Remember this occurred if this is a C99 macro invocation with at least |
| 1030 | // one actual argument. |
| 1031 | isVarargsElided = MI->isC99Varargs() && MI->getNumArgs() > 1; |
| 1032 | } else if (MI->getNumArgs() == 1) { |
| 1033 | // #define A(x) |
| 1034 | // A() |
| 1035 | // is ok because it is an empty argument. |
| 1036 | |
| 1037 | // Empty arguments are standard in C99 and supported as an extension in |
| 1038 | // other modes. |
| 1039 | if (ArgTokens.empty() && !Features.C99) |
| 1040 | Diag(Tok, diag::ext_empty_fnmacro_arg); |
| 1041 | } else { |
| 1042 | // Otherwise, emit the error. |
| 1043 | Diag(Tok, diag::err_too_few_args_in_macro_invoc); |
| 1044 | return 0; |
| 1045 | } |
| 1046 | |
| 1047 | // Add a marker EOF token to the end of the token list for this argument. |
| 1048 | SourceLocation EndLoc = Tok.getLocation(); |
| 1049 | Tok.startToken(); |
| 1050 | Tok.setKind(tok::eof); |
| 1051 | Tok.setLocation(EndLoc); |
| 1052 | Tok.setLength(0); |
| 1053 | ArgTokens.push_back(Tok); |
| 1054 | } |
| 1055 | |
| 1056 | return MacroArgs::create(MI, &ArgTokens[0], ArgTokens.size(),isVarargsElided); |
| 1057 | } |
| 1058 | |
| 1059 | /// ComputeDATE_TIME - Compute the current time, enter it into the specified |
| 1060 | /// scratch buffer, then return DATELoc/TIMELoc locations with the position of |
| 1061 | /// the identifier tokens inserted. |
| 1062 | static void ComputeDATE_TIME(SourceLocation &DATELoc, SourceLocation &TIMELoc, |
| 1063 | Preprocessor &PP) { |
| 1064 | time_t TT = time(0); |
| 1065 | struct tm *TM = localtime(&TT); |
| 1066 | |
| 1067 | static const char * const Months[] = { |
| 1068 | "Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec" |
| 1069 | }; |
| 1070 | |
| 1071 | char TmpBuffer[100]; |
| 1072 | sprintf(TmpBuffer, "\"%s %2d %4d\"", Months[TM->tm_mon], TM->tm_mday, |
| 1073 | TM->tm_year+1900); |
| 1074 | DATELoc = PP.CreateString(TmpBuffer, strlen(TmpBuffer)); |
| 1075 | |
| 1076 | sprintf(TmpBuffer, "\"%02d:%02d:%02d\"", TM->tm_hour, TM->tm_min, TM->tm_sec); |
| 1077 | TIMELoc = PP.CreateString(TmpBuffer, strlen(TmpBuffer)); |
| 1078 | } |
| 1079 | |
| 1080 | /// ExpandBuiltinMacro - If an identifier token is read that is to be expanded |
| 1081 | /// as a builtin macro, handle it and return the next token as 'Tok'. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 1082 | void Preprocessor::ExpandBuiltinMacro(Token &Tok) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1083 | // Figure out which token this is. |
| 1084 | IdentifierInfo *II = Tok.getIdentifierInfo(); |
| 1085 | assert(II && "Can't be a macro without id info!"); |
| 1086 | |
| 1087 | // If this is an _Pragma directive, expand it, invoke the pragma handler, then |
| 1088 | // lex the token after it. |
| 1089 | if (II == Ident_Pragma) |
| 1090 | return Handle_Pragma(Tok); |
| 1091 | |
| 1092 | ++NumBuiltinMacroExpanded; |
| 1093 | |
| 1094 | char TmpBuffer[100]; |
| 1095 | |
| 1096 | // Set up the return result. |
| 1097 | Tok.setIdentifierInfo(0); |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 1098 | Tok.clearFlag(Token::NeedsCleaning); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1099 | |
| 1100 | if (II == Ident__LINE__) { |
| 1101 | // __LINE__ expands to a simple numeric value. |
Chris Lattner | 9dc1f53 | 2007-07-20 16:37:10 +0000 | [diff] [blame] | 1102 | sprintf(TmpBuffer, "%u", SourceMgr.getLogicalLineNumber(Tok.getLocation())); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1103 | unsigned Length = strlen(TmpBuffer); |
| 1104 | Tok.setKind(tok::numeric_constant); |
| 1105 | Tok.setLength(Length); |
| 1106 | Tok.setLocation(CreateString(TmpBuffer, Length, Tok.getLocation())); |
| 1107 | } else if (II == Ident__FILE__ || II == Ident__BASE_FILE__) { |
| 1108 | SourceLocation Loc = Tok.getLocation(); |
| 1109 | if (II == Ident__BASE_FILE__) { |
| 1110 | Diag(Tok, diag::ext_pp_base_file); |
Chris Lattner | 9dc1f53 | 2007-07-20 16:37:10 +0000 | [diff] [blame] | 1111 | SourceLocation NextLoc = SourceMgr.getIncludeLoc(Loc); |
| 1112 | while (NextLoc.isValid()) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1113 | Loc = NextLoc; |
Chris Lattner | 9dc1f53 | 2007-07-20 16:37:10 +0000 | [diff] [blame] | 1114 | NextLoc = SourceMgr.getIncludeLoc(Loc); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1115 | } |
| 1116 | } |
| 1117 | |
| 1118 | // Escape this filename. Turn '\' -> '\\' '"' -> '\"' |
Chris Lattner | 9dc1f53 | 2007-07-20 16:37:10 +0000 | [diff] [blame] | 1119 | std::string FN = SourceMgr.getSourceName(SourceMgr.getLogicalLoc(Loc)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1120 | FN = '"' + Lexer::Stringify(FN) + '"'; |
| 1121 | Tok.setKind(tok::string_literal); |
| 1122 | Tok.setLength(FN.size()); |
| 1123 | Tok.setLocation(CreateString(&FN[0], FN.size(), Tok.getLocation())); |
| 1124 | } else if (II == Ident__DATE__) { |
| 1125 | if (!DATELoc.isValid()) |
| 1126 | ComputeDATE_TIME(DATELoc, TIMELoc, *this); |
| 1127 | Tok.setKind(tok::string_literal); |
| 1128 | Tok.setLength(strlen("\"Mmm dd yyyy\"")); |
| 1129 | Tok.setLocation(SourceMgr.getInstantiationLoc(DATELoc, Tok.getLocation())); |
| 1130 | } else if (II == Ident__TIME__) { |
| 1131 | if (!TIMELoc.isValid()) |
| 1132 | ComputeDATE_TIME(DATELoc, TIMELoc, *this); |
| 1133 | Tok.setKind(tok::string_literal); |
| 1134 | Tok.setLength(strlen("\"hh:mm:ss\"")); |
| 1135 | Tok.setLocation(SourceMgr.getInstantiationLoc(TIMELoc, Tok.getLocation())); |
| 1136 | } else if (II == Ident__INCLUDE_LEVEL__) { |
| 1137 | Diag(Tok, diag::ext_pp_include_level); |
| 1138 | |
| 1139 | // Compute the include depth of this token. |
| 1140 | unsigned Depth = 0; |
Chris Lattner | 9dc1f53 | 2007-07-20 16:37:10 +0000 | [diff] [blame] | 1141 | SourceLocation Loc = SourceMgr.getIncludeLoc(Tok.getLocation()); |
| 1142 | for (; Loc.isValid(); ++Depth) |
| 1143 | Loc = SourceMgr.getIncludeLoc(Loc); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1144 | |
| 1145 | // __INCLUDE_LEVEL__ expands to a simple numeric value. |
| 1146 | sprintf(TmpBuffer, "%u", Depth); |
| 1147 | unsigned Length = strlen(TmpBuffer); |
| 1148 | Tok.setKind(tok::numeric_constant); |
| 1149 | Tok.setLength(Length); |
| 1150 | Tok.setLocation(CreateString(TmpBuffer, Length, Tok.getLocation())); |
| 1151 | } else if (II == Ident__TIMESTAMP__) { |
| 1152 | // MSVC, ICC, GCC, VisualAge C++ extension. The generated string should be |
| 1153 | // of the form "Ddd Mmm dd hh::mm::ss yyyy", which is returned by asctime. |
| 1154 | Diag(Tok, diag::ext_pp_timestamp); |
| 1155 | |
| 1156 | // Get the file that we are lexing out of. If we're currently lexing from |
| 1157 | // a macro, dig into the include stack. |
| 1158 | const FileEntry *CurFile = 0; |
| 1159 | Lexer *TheLexer = getCurrentFileLexer(); |
| 1160 | |
| 1161 | if (TheLexer) |
Chris Lattner | 9dc1f53 | 2007-07-20 16:37:10 +0000 | [diff] [blame] | 1162 | CurFile = SourceMgr.getFileEntryForLoc(TheLexer->getFileLoc()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1163 | |
| 1164 | // If this file is older than the file it depends on, emit a diagnostic. |
| 1165 | const char *Result; |
| 1166 | if (CurFile) { |
| 1167 | time_t TT = CurFile->getModificationTime(); |
| 1168 | struct tm *TM = localtime(&TT); |
| 1169 | Result = asctime(TM); |
| 1170 | } else { |
| 1171 | Result = "??? ??? ?? ??:??:?? ????\n"; |
| 1172 | } |
| 1173 | TmpBuffer[0] = '"'; |
| 1174 | strcpy(TmpBuffer+1, Result); |
| 1175 | unsigned Len = strlen(TmpBuffer); |
| 1176 | TmpBuffer[Len-1] = '"'; // Replace the newline with a quote. |
| 1177 | Tok.setKind(tok::string_literal); |
| 1178 | Tok.setLength(Len); |
| 1179 | Tok.setLocation(CreateString(TmpBuffer, Len, Tok.getLocation())); |
| 1180 | } else { |
| 1181 | assert(0 && "Unknown identifier!"); |
Chris Lattner | c3d8d57 | 2007-12-09 20:31:55 +0000 | [diff] [blame] | 1182 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1183 | } |
| 1184 | |
| 1185 | //===----------------------------------------------------------------------===// |
| 1186 | // Lexer Event Handling. |
| 1187 | //===----------------------------------------------------------------------===// |
| 1188 | |
| 1189 | /// LookUpIdentifierInfo - Given a tok::identifier token, look up the |
| 1190 | /// identifier information for the token and install it into the token. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 1191 | IdentifierInfo *Preprocessor::LookUpIdentifierInfo(Token &Identifier, |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1192 | const char *BufPtr) { |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 1193 | assert(Identifier.is(tok::identifier) && "Not an identifier!"); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1194 | assert(Identifier.getIdentifierInfo() == 0 && "Identinfo already exists!"); |
| 1195 | |
| 1196 | // Look up this token, see if it is a macro, or if it is a language keyword. |
| 1197 | IdentifierInfo *II; |
| 1198 | if (BufPtr && !Identifier.needsCleaning()) { |
| 1199 | // No cleaning needed, just use the characters from the lexed buffer. |
| 1200 | II = getIdentifierInfo(BufPtr, BufPtr+Identifier.getLength()); |
| 1201 | } else { |
| 1202 | // Cleaning needed, alloca a buffer, clean into it, then use the buffer. |
Chris Lattner | c35717a | 2007-07-13 17:10:38 +0000 | [diff] [blame] | 1203 | llvm::SmallVector<char, 64> IdentifierBuffer; |
| 1204 | IdentifierBuffer.resize(Identifier.getLength()); |
| 1205 | const char *TmpBuf = &IdentifierBuffer[0]; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1206 | unsigned Size = getSpelling(Identifier, TmpBuf); |
| 1207 | II = getIdentifierInfo(TmpBuf, TmpBuf+Size); |
| 1208 | } |
| 1209 | Identifier.setIdentifierInfo(II); |
| 1210 | return II; |
| 1211 | } |
| 1212 | |
| 1213 | |
| 1214 | /// HandleIdentifier - This callback is invoked when the lexer reads an |
| 1215 | /// identifier. This callback looks up the identifier in the map and/or |
| 1216 | /// potentially macro expands it or turns it into a named token (like 'for'). |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 1217 | void Preprocessor::HandleIdentifier(Token &Identifier) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1218 | assert(Identifier.getIdentifierInfo() && |
| 1219 | "Can't handle identifiers without identifier info!"); |
| 1220 | |
| 1221 | IdentifierInfo &II = *Identifier.getIdentifierInfo(); |
| 1222 | |
| 1223 | // If this identifier was poisoned, and if it was not produced from a macro |
| 1224 | // expansion, emit an error. |
| 1225 | if (II.isPoisoned() && CurLexer) { |
| 1226 | if (&II != Ident__VA_ARGS__) // We warn about __VA_ARGS__ with poisoning. |
| 1227 | Diag(Identifier, diag::err_pp_used_poisoned_id); |
| 1228 | else |
| 1229 | Diag(Identifier, diag::ext_pp_bad_vaargs_use); |
| 1230 | } |
| 1231 | |
| 1232 | // If this is a macro to be expanded, do it. |
Chris Lattner | cc1a875 | 2007-10-07 08:44:20 +0000 | [diff] [blame] | 1233 | if (MacroInfo *MI = getMacroInfo(&II)) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1234 | if (!DisableMacroExpansion && !Identifier.isExpandDisabled()) { |
| 1235 | if (MI->isEnabled()) { |
| 1236 | if (!HandleMacroExpandedIdentifier(Identifier, MI)) |
| 1237 | return; |
| 1238 | } else { |
| 1239 | // C99 6.10.3.4p2 says that a disabled macro may never again be |
| 1240 | // expanded, even if it's in a context where it could be expanded in the |
| 1241 | // future. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 1242 | Identifier.setFlag(Token::DisableExpand); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1243 | } |
| 1244 | } |
| 1245 | } else if (II.isOtherTargetMacro() && !DisableMacroExpansion) { |
| 1246 | // If this identifier is a macro on some other target, emit a diagnostic. |
| 1247 | // This diagnosic is only emitted when macro expansion is enabled, because |
| 1248 | // the macro would not have been expanded for the other target either. |
| 1249 | II.setIsOtherTargetMacro(false); // Don't warn on second use. |
Ted Kremenek | 9c728dc | 2007-12-12 22:39:36 +0000 | [diff] [blame] | 1250 | getTargetInfo().DiagnoseNonPortability(getFullLoc(Identifier.getLocation()), |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1251 | diag::port_target_macro_use); |
| 1252 | |
| 1253 | } |
| 1254 | |
| 1255 | // C++ 2.11p2: If this is an alternative representation of a C++ operator, |
| 1256 | // then we act as if it is the actual operator and not the textual |
| 1257 | // representation of it. |
| 1258 | if (II.isCPlusPlusOperatorKeyword()) |
| 1259 | Identifier.setIdentifierInfo(0); |
| 1260 | |
| 1261 | // Change the kind of this identifier to the appropriate token kind, e.g. |
| 1262 | // turning "for" into a keyword. |
| 1263 | Identifier.setKind(II.getTokenID()); |
| 1264 | |
| 1265 | // If this is an extension token, diagnose its use. |
| 1266 | // FIXME: tried (unsuccesfully) to shut this up when compiling with gnu99 |
| 1267 | // For now, I'm just commenting it out (while I work on attributes). |
| 1268 | if (II.isExtensionToken() && Features.C99) |
| 1269 | Diag(Identifier, diag::ext_token_used); |
| 1270 | } |
| 1271 | |
| 1272 | /// HandleEndOfFile - This callback is invoked when the lexer hits the end of |
| 1273 | /// the current file. This either returns the EOF token or pops a level off |
| 1274 | /// the include stack and keeps going. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 1275 | bool Preprocessor::HandleEndOfFile(Token &Result, bool isEndOfMacro) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1276 | assert(!CurMacroExpander && |
| 1277 | "Ending a file when currently in a macro!"); |
| 1278 | |
| 1279 | // See if this file had a controlling macro. |
| 1280 | if (CurLexer) { // Not ending a macro, ignore it. |
| 1281 | if (const IdentifierInfo *ControllingMacro = |
| 1282 | CurLexer->MIOpt.GetControllingMacroAtEndOfFile()) { |
| 1283 | // Okay, this has a controlling macro, remember in PerFileInfo. |
| 1284 | if (const FileEntry *FE = |
Chris Lattner | 9dc1f53 | 2007-07-20 16:37:10 +0000 | [diff] [blame] | 1285 | SourceMgr.getFileEntryForLoc(CurLexer->getFileLoc())) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1286 | HeaderInfo.SetFileControllingMacro(FE, ControllingMacro); |
| 1287 | } |
| 1288 | } |
| 1289 | |
| 1290 | // If this is a #include'd file, pop it off the include stack and continue |
| 1291 | // lexing the #includer file. |
| 1292 | if (!IncludeMacroStack.empty()) { |
| 1293 | // We're done with the #included file. |
| 1294 | RemoveTopOfLexerStack(); |
| 1295 | |
| 1296 | // Notify the client, if desired, that we are in a new source file. |
| 1297 | if (Callbacks && !isEndOfMacro && CurLexer) { |
| 1298 | DirectoryLookup::DirType FileType = DirectoryLookup::NormalHeaderDir; |
| 1299 | |
| 1300 | // Get the file entry for the current file. |
| 1301 | if (const FileEntry *FE = |
Chris Lattner | 9dc1f53 | 2007-07-20 16:37:10 +0000 | [diff] [blame] | 1302 | SourceMgr.getFileEntryForLoc(CurLexer->getFileLoc())) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1303 | FileType = HeaderInfo.getFileDirFlavor(FE); |
| 1304 | |
| 1305 | Callbacks->FileChanged(CurLexer->getSourceLocation(CurLexer->BufferPtr), |
| 1306 | PPCallbacks::ExitFile, FileType); |
| 1307 | } |
| 1308 | |
| 1309 | // Client should lex another token. |
| 1310 | return false; |
| 1311 | } |
Chris Lattner | 09cf90f | 2008-01-25 00:00:30 +0000 | [diff] [blame] | 1312 | |
| 1313 | // If the file ends with a newline, form the EOF token on the newline itself, |
| 1314 | // rather than "on the line following it", which doesn't exist. This makes |
| 1315 | // diagnostics relating to the end of file include the last file that the user |
| 1316 | // actually typed, which is goodness. |
| 1317 | const char *EndPos = CurLexer->BufferEnd; |
| 1318 | if (EndPos != CurLexer->BufferStart && |
| 1319 | (EndPos[-1] == '\n' || EndPos[-1] == '\r')) { |
| 1320 | --EndPos; |
| 1321 | |
| 1322 | // Handle \n\r and \r\n: |
| 1323 | if (EndPos != CurLexer->BufferStart && |
| 1324 | (EndPos[-1] == '\n' || EndPos[-1] == '\r') && |
| 1325 | EndPos[-1] != EndPos[0]) |
| 1326 | --EndPos; |
| 1327 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1328 | |
| 1329 | Result.startToken(); |
Chris Lattner | 09cf90f | 2008-01-25 00:00:30 +0000 | [diff] [blame] | 1330 | CurLexer->BufferPtr = EndPos; |
| 1331 | CurLexer->FormTokenWithChars(Result, EndPos); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1332 | Result.setKind(tok::eof); |
| 1333 | |
| 1334 | // We're done with the #included file. |
| 1335 | delete CurLexer; |
| 1336 | CurLexer = 0; |
| 1337 | |
| 1338 | // This is the end of the top-level file. If the diag::pp_macro_not_used |
Chris Lattner | cc1a875 | 2007-10-07 08:44:20 +0000 | [diff] [blame] | 1339 | // diagnostic is enabled, look for macros that have not been used. |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1340 | if (Diags.getDiagnosticLevel(diag::pp_macro_not_used) != Diagnostic::Ignored){ |
Chris Lattner | cc1a875 | 2007-10-07 08:44:20 +0000 | [diff] [blame] | 1341 | for (llvm::DenseMap<IdentifierInfo*, MacroInfo*>::iterator I = |
| 1342 | Macros.begin(), E = Macros.end(); I != E; ++I) { |
| 1343 | if (!I->second->isUsed()) |
| 1344 | Diag(I->second->getDefinitionLoc(), diag::pp_macro_not_used); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1345 | } |
| 1346 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1347 | return true; |
| 1348 | } |
| 1349 | |
| 1350 | /// HandleEndOfMacro - This callback is invoked when the lexer hits the end of |
| 1351 | /// the current macro expansion or token stream expansion. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 1352 | bool Preprocessor::HandleEndOfMacro(Token &Result) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1353 | assert(CurMacroExpander && !CurLexer && |
| 1354 | "Ending a macro when currently in a #include file!"); |
| 1355 | |
Chris Lattner | 9594acf | 2007-07-15 00:25:26 +0000 | [diff] [blame] | 1356 | // Delete or cache the now-dead macro expander. |
| 1357 | if (NumCachedMacroExpanders == MacroExpanderCacheSize) |
| 1358 | delete CurMacroExpander; |
| 1359 | else |
| 1360 | MacroExpanderCache[NumCachedMacroExpanders++] = CurMacroExpander; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1361 | |
| 1362 | // Handle this like a #include file being popped off the stack. |
| 1363 | CurMacroExpander = 0; |
| 1364 | return HandleEndOfFile(Result, true); |
| 1365 | } |
| 1366 | |
Chris Lattner | 3f1cc83 | 2008-02-07 06:03:59 +0000 | [diff] [blame] | 1367 | /// HandleMicrosoftCommentPaste - When the macro expander pastes together a |
| 1368 | /// comment (/##/) in microsoft mode, this method handles updating the current |
| 1369 | /// state, returning the token on the next source line. |
| 1370 | void Preprocessor::HandleMicrosoftCommentPaste(Token &Tok) { |
| 1371 | assert(CurMacroExpander && !CurLexer && |
| 1372 | "Pasted comment can only be formed from macro"); |
| 1373 | |
| 1374 | // We handle this by scanning for the closest real lexer, switching it to |
| 1375 | // raw mode and preprocessor mode. This will cause it to return \n as an |
| 1376 | // explicit EOM token. |
| 1377 | Lexer *FoundLexer = 0; |
| 1378 | bool LexerWasInPPMode = false; |
| 1379 | for (unsigned i = 0, e = IncludeMacroStack.size(); i != e; ++i) { |
| 1380 | IncludeStackInfo &ISI = *(IncludeMacroStack.end()-i-1); |
| 1381 | if (ISI.TheLexer == 0) continue; // Scan for a real lexer. |
| 1382 | |
| 1383 | // Once we find a real lexer, mark it as raw mode (disabling macro |
| 1384 | // expansions) and preprocessor mode (return EOM). We know that the lexer |
| 1385 | // was *not* in raw mode before, because the macro that the comment came |
| 1386 | // from was expanded. However, it could have already been in preprocessor |
| 1387 | // mode (#if COMMENT) in which case we have to return it to that mode and |
| 1388 | // return EOM. |
| 1389 | FoundLexer = ISI.TheLexer; |
| 1390 | FoundLexer->LexingRawMode = true; |
| 1391 | LexerWasInPPMode = FoundLexer->ParsingPreprocessorDirective; |
| 1392 | FoundLexer->ParsingPreprocessorDirective = true; |
| 1393 | break; |
| 1394 | } |
| 1395 | |
| 1396 | // Okay, we either found and switched over the lexer, or we didn't find a |
| 1397 | // lexer. In either case, finish off the macro the comment came from, getting |
| 1398 | // the next token. |
| 1399 | if (!HandleEndOfMacro(Tok)) Lex(Tok); |
| 1400 | |
| 1401 | // Discarding comments as long as we don't have EOF or EOM. This 'comments |
| 1402 | // out' the rest of the line, including any tokens that came from other macros |
| 1403 | // that were active, as in: |
| 1404 | // #define submacro a COMMENT b |
| 1405 | // submacro c |
| 1406 | // which should lex to 'a' only: 'b' and 'c' should be removed. |
| 1407 | while (Tok.isNot(tok::eom) && Tok.isNot(tok::eof)) |
| 1408 | Lex(Tok); |
| 1409 | |
| 1410 | // If we got an eom token, then we successfully found the end of the line. |
| 1411 | if (Tok.is(tok::eom)) { |
| 1412 | assert(FoundLexer && "Can't get end of line without an active lexer"); |
| 1413 | // Restore the lexer back to normal mode instead of raw mode. |
| 1414 | FoundLexer->LexingRawMode = false; |
| 1415 | |
| 1416 | // If the lexer was already in preprocessor mode, just return the EOM token |
| 1417 | // to finish the preprocessor line. |
| 1418 | if (LexerWasInPPMode) return; |
| 1419 | |
| 1420 | // Otherwise, switch out of PP mode and return the next lexed token. |
| 1421 | FoundLexer->ParsingPreprocessorDirective = false; |
| 1422 | return Lex(Tok); |
| 1423 | } |
| 1424 | |
| 1425 | // If we got an EOF token, then we reached the end of the token stream but |
| 1426 | // didn't find an explicit \n. This can only happen if there was no lexer |
| 1427 | // active (an active lexer would return EOM at EOF if there was no \n in |
| 1428 | // preprocessor directive mode), so just return EOF as our token. |
| 1429 | assert(!FoundLexer && "Lexer should return EOM before EOF in PP mode"); |
| 1430 | return; |
| 1431 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1432 | |
| 1433 | //===----------------------------------------------------------------------===// |
| 1434 | // Utility Methods for Preprocessor Directive Handling. |
| 1435 | //===----------------------------------------------------------------------===// |
| 1436 | |
| 1437 | /// DiscardUntilEndOfDirective - Read and discard all tokens remaining on the |
| 1438 | /// current line until the tok::eom token is found. |
| 1439 | void Preprocessor::DiscardUntilEndOfDirective() { |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 1440 | Token Tmp; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1441 | do { |
| 1442 | LexUnexpandedToken(Tmp); |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 1443 | } while (Tmp.isNot(tok::eom)); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1444 | } |
| 1445 | |
| 1446 | /// isCXXNamedOperator - Returns "true" if the token is a named operator in C++. |
| 1447 | static bool isCXXNamedOperator(const std::string &Spelling) { |
| 1448 | return Spelling == "and" || Spelling == "bitand" || Spelling == "bitor" || |
| 1449 | Spelling == "compl" || Spelling == "not" || Spelling == "not_eq" || |
| 1450 | Spelling == "or" || Spelling == "xor"; |
| 1451 | } |
| 1452 | |
| 1453 | /// ReadMacroName - Lex and validate a macro name, which occurs after a |
| 1454 | /// #define or #undef. This sets the token kind to eom and discards the rest |
| 1455 | /// of the macro line if the macro name is invalid. isDefineUndef is 1 if |
| 1456 | /// this is due to a a #define, 2 if #undef directive, 0 if it is something |
| 1457 | /// else (e.g. #ifdef). |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 1458 | void Preprocessor::ReadMacroName(Token &MacroNameTok, char isDefineUndef) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1459 | // Read the token, don't allow macro expansion on it. |
| 1460 | LexUnexpandedToken(MacroNameTok); |
| 1461 | |
| 1462 | // Missing macro name? |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 1463 | if (MacroNameTok.is(tok::eom)) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1464 | return Diag(MacroNameTok, diag::err_pp_missing_macro_name); |
| 1465 | |
| 1466 | IdentifierInfo *II = MacroNameTok.getIdentifierInfo(); |
| 1467 | if (II == 0) { |
| 1468 | std::string Spelling = getSpelling(MacroNameTok); |
| 1469 | if (isCXXNamedOperator(Spelling)) |
| 1470 | // C++ 2.5p2: Alternative tokens behave the same as its primary token |
| 1471 | // except for their spellings. |
| 1472 | Diag(MacroNameTok, diag::err_pp_operator_used_as_macro_name, Spelling); |
| 1473 | else |
| 1474 | Diag(MacroNameTok, diag::err_pp_macro_not_identifier); |
| 1475 | // Fall through on error. |
| 1476 | } else if (isDefineUndef && II->getPPKeywordID() == tok::pp_defined) { |
| 1477 | // Error if defining "defined": C99 6.10.8.4. |
| 1478 | Diag(MacroNameTok, diag::err_defined_macro_name); |
Chris Lattner | 0edde55 | 2007-10-07 08:04:56 +0000 | [diff] [blame] | 1479 | } else if (isDefineUndef && II->hasMacroDefinition() && |
Chris Lattner | cc1a875 | 2007-10-07 08:44:20 +0000 | [diff] [blame] | 1480 | getMacroInfo(II)->isBuiltinMacro()) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1481 | // Error if defining "__LINE__" and other builtins: C99 6.10.8.4. |
| 1482 | if (isDefineUndef == 1) |
| 1483 | Diag(MacroNameTok, diag::pp_redef_builtin_macro); |
| 1484 | else |
| 1485 | Diag(MacroNameTok, diag::pp_undef_builtin_macro); |
| 1486 | } else { |
| 1487 | // Okay, we got a good identifier node. Return it. |
| 1488 | return; |
| 1489 | } |
| 1490 | |
| 1491 | // Invalid macro name, read and discard the rest of the line. Then set the |
| 1492 | // token kind to tok::eom. |
| 1493 | MacroNameTok.setKind(tok::eom); |
| 1494 | return DiscardUntilEndOfDirective(); |
| 1495 | } |
| 1496 | |
| 1497 | /// CheckEndOfDirective - Ensure that the next token is a tok::eom token. If |
| 1498 | /// not, emit a diagnostic and consume up until the eom. |
| 1499 | void Preprocessor::CheckEndOfDirective(const char *DirType) { |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 1500 | Token Tmp; |
Chris Lattner | e9ba323 | 2008-02-16 01:20:36 +0000 | [diff] [blame] | 1501 | // Lex unexpanded tokens: macros might expand to zero tokens, causing us to |
| 1502 | // miss diagnosing invalid lines. |
| 1503 | LexUnexpandedToken(Tmp); |
| 1504 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1505 | // There should be no tokens after the directive, but we allow them as an |
| 1506 | // extension. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 1507 | while (Tmp.is(tok::comment)) // Skip comments in -C mode. |
Chris Lattner | e9ba323 | 2008-02-16 01:20:36 +0000 | [diff] [blame] | 1508 | LexUnexpandedToken(Tmp); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1509 | |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 1510 | if (Tmp.isNot(tok::eom)) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1511 | Diag(Tmp, diag::ext_pp_extra_tokens_at_eol, DirType); |
| 1512 | DiscardUntilEndOfDirective(); |
| 1513 | } |
| 1514 | } |
| 1515 | |
| 1516 | |
| 1517 | |
| 1518 | /// SkipExcludedConditionalBlock - We just read a #if or related directive and |
| 1519 | /// decided that the subsequent tokens are in the #if'd out portion of the |
| 1520 | /// file. Lex the rest of the file, until we see an #endif. If |
| 1521 | /// FoundNonSkipPortion is true, then we have already emitted code for part of |
| 1522 | /// this #if directive, so #else/#elif blocks should never be entered. If ElseOk |
| 1523 | /// is true, then #else directives are ok, if not, then we have already seen one |
| 1524 | /// so a #else directive is a duplicate. When this returns, the caller can lex |
| 1525 | /// the first valid token. |
| 1526 | void Preprocessor::SkipExcludedConditionalBlock(SourceLocation IfTokenLoc, |
| 1527 | bool FoundNonSkipPortion, |
| 1528 | bool FoundElse) { |
| 1529 | ++NumSkipped; |
| 1530 | assert(CurMacroExpander == 0 && CurLexer && |
| 1531 | "Lexing a macro, not a file?"); |
| 1532 | |
| 1533 | CurLexer->pushConditionalLevel(IfTokenLoc, /*isSkipping*/false, |
| 1534 | FoundNonSkipPortion, FoundElse); |
| 1535 | |
| 1536 | // Enter raw mode to disable identifier lookup (and thus macro expansion), |
| 1537 | // disabling warnings, etc. |
| 1538 | CurLexer->LexingRawMode = true; |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 1539 | Token Tok; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1540 | while (1) { |
| 1541 | CurLexer->Lex(Tok); |
| 1542 | |
| 1543 | // If this is the end of the buffer, we have an error. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 1544 | if (Tok.is(tok::eof)) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1545 | // Emit errors for each unterminated conditional on the stack, including |
| 1546 | // the current one. |
| 1547 | while (!CurLexer->ConditionalStack.empty()) { |
| 1548 | Diag(CurLexer->ConditionalStack.back().IfLoc, |
| 1549 | diag::err_pp_unterminated_conditional); |
| 1550 | CurLexer->ConditionalStack.pop_back(); |
| 1551 | } |
| 1552 | |
| 1553 | // Just return and let the caller lex after this #include. |
| 1554 | break; |
| 1555 | } |
| 1556 | |
| 1557 | // If this token is not a preprocessor directive, just skip it. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 1558 | if (Tok.isNot(tok::hash) || !Tok.isAtStartOfLine()) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1559 | continue; |
| 1560 | |
| 1561 | // We just parsed a # character at the start of a line, so we're in |
| 1562 | // directive mode. Tell the lexer this so any newlines we see will be |
| 1563 | // converted into an EOM token (this terminates the macro). |
| 1564 | CurLexer->ParsingPreprocessorDirective = true; |
| 1565 | CurLexer->KeepCommentMode = false; |
| 1566 | |
| 1567 | |
| 1568 | // Read the next token, the directive flavor. |
| 1569 | LexUnexpandedToken(Tok); |
| 1570 | |
| 1571 | // If this isn't an identifier directive (e.g. is "# 1\n" or "#\n", or |
| 1572 | // something bogus), skip it. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 1573 | if (Tok.isNot(tok::identifier)) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1574 | CurLexer->ParsingPreprocessorDirective = false; |
| 1575 | // Restore comment saving mode. |
| 1576 | CurLexer->KeepCommentMode = KeepComments; |
| 1577 | continue; |
| 1578 | } |
| 1579 | |
| 1580 | // If the first letter isn't i or e, it isn't intesting to us. We know that |
| 1581 | // this is safe in the face of spelling differences, because there is no way |
| 1582 | // to spell an i/e in a strange way that is another letter. Skipping this |
| 1583 | // allows us to avoid looking up the identifier info for #define/#undef and |
| 1584 | // other common directives. |
| 1585 | const char *RawCharData = SourceMgr.getCharacterData(Tok.getLocation()); |
| 1586 | char FirstChar = RawCharData[0]; |
| 1587 | if (FirstChar >= 'a' && FirstChar <= 'z' && |
| 1588 | FirstChar != 'i' && FirstChar != 'e') { |
| 1589 | CurLexer->ParsingPreprocessorDirective = false; |
| 1590 | // Restore comment saving mode. |
| 1591 | CurLexer->KeepCommentMode = KeepComments; |
| 1592 | continue; |
| 1593 | } |
| 1594 | |
| 1595 | // Get the identifier name without trigraphs or embedded newlines. Note |
| 1596 | // that we can't use Tok.getIdentifierInfo() because its lookup is disabled |
| 1597 | // when skipping. |
| 1598 | // TODO: could do this with zero copies in the no-clean case by using |
| 1599 | // strncmp below. |
| 1600 | char Directive[20]; |
| 1601 | unsigned IdLen; |
| 1602 | if (!Tok.needsCleaning() && Tok.getLength() < 20) { |
| 1603 | IdLen = Tok.getLength(); |
| 1604 | memcpy(Directive, RawCharData, IdLen); |
| 1605 | Directive[IdLen] = 0; |
| 1606 | } else { |
| 1607 | std::string DirectiveStr = getSpelling(Tok); |
| 1608 | IdLen = DirectiveStr.size(); |
| 1609 | if (IdLen >= 20) { |
| 1610 | CurLexer->ParsingPreprocessorDirective = false; |
| 1611 | // Restore comment saving mode. |
| 1612 | CurLexer->KeepCommentMode = KeepComments; |
| 1613 | continue; |
| 1614 | } |
| 1615 | memcpy(Directive, &DirectiveStr[0], IdLen); |
| 1616 | Directive[IdLen] = 0; |
| 1617 | } |
| 1618 | |
| 1619 | if (FirstChar == 'i' && Directive[1] == 'f') { |
| 1620 | if ((IdLen == 2) || // "if" |
| 1621 | (IdLen == 5 && !strcmp(Directive+2, "def")) || // "ifdef" |
| 1622 | (IdLen == 6 && !strcmp(Directive+2, "ndef"))) { // "ifndef" |
| 1623 | // We know the entire #if/#ifdef/#ifndef block will be skipped, don't |
| 1624 | // bother parsing the condition. |
| 1625 | DiscardUntilEndOfDirective(); |
| 1626 | CurLexer->pushConditionalLevel(Tok.getLocation(), /*wasskipping*/true, |
| 1627 | /*foundnonskip*/false, |
| 1628 | /*fnddelse*/false); |
| 1629 | } |
| 1630 | } else if (FirstChar == 'e') { |
| 1631 | if (IdLen == 5 && !strcmp(Directive+1, "ndif")) { // "endif" |
| 1632 | CheckEndOfDirective("#endif"); |
| 1633 | PPConditionalInfo CondInfo; |
| 1634 | CondInfo.WasSkipping = true; // Silence bogus warning. |
| 1635 | bool InCond = CurLexer->popConditionalLevel(CondInfo); |
| 1636 | InCond = InCond; // Silence warning in no-asserts mode. |
| 1637 | assert(!InCond && "Can't be skipping if not in a conditional!"); |
| 1638 | |
| 1639 | // If we popped the outermost skipping block, we're done skipping! |
| 1640 | if (!CondInfo.WasSkipping) |
| 1641 | break; |
| 1642 | } else if (IdLen == 4 && !strcmp(Directive+1, "lse")) { // "else". |
| 1643 | // #else directive in a skipping conditional. If not in some other |
| 1644 | // skipping conditional, and if #else hasn't already been seen, enter it |
| 1645 | // as a non-skipping conditional. |
| 1646 | CheckEndOfDirective("#else"); |
| 1647 | PPConditionalInfo &CondInfo = CurLexer->peekConditionalLevel(); |
| 1648 | |
| 1649 | // If this is a #else with a #else before it, report the error. |
| 1650 | if (CondInfo.FoundElse) Diag(Tok, diag::pp_err_else_after_else); |
| 1651 | |
| 1652 | // Note that we've seen a #else in this conditional. |
| 1653 | CondInfo.FoundElse = true; |
| 1654 | |
| 1655 | // If the conditional is at the top level, and the #if block wasn't |
| 1656 | // entered, enter the #else block now. |
| 1657 | if (!CondInfo.WasSkipping && !CondInfo.FoundNonSkip) { |
| 1658 | CondInfo.FoundNonSkip = true; |
| 1659 | break; |
| 1660 | } |
| 1661 | } else if (IdLen == 4 && !strcmp(Directive+1, "lif")) { // "elif". |
| 1662 | PPConditionalInfo &CondInfo = CurLexer->peekConditionalLevel(); |
| 1663 | |
| 1664 | bool ShouldEnter; |
| 1665 | // If this is in a skipping block or if we're already handled this #if |
| 1666 | // block, don't bother parsing the condition. |
| 1667 | if (CondInfo.WasSkipping || CondInfo.FoundNonSkip) { |
| 1668 | DiscardUntilEndOfDirective(); |
| 1669 | ShouldEnter = false; |
| 1670 | } else { |
| 1671 | // Restore the value of LexingRawMode so that identifiers are |
| 1672 | // looked up, etc, inside the #elif expression. |
| 1673 | assert(CurLexer->LexingRawMode && "We have to be skipping here!"); |
| 1674 | CurLexer->LexingRawMode = false; |
| 1675 | IdentifierInfo *IfNDefMacro = 0; |
| 1676 | ShouldEnter = EvaluateDirectiveExpression(IfNDefMacro); |
| 1677 | CurLexer->LexingRawMode = true; |
| 1678 | } |
| 1679 | |
| 1680 | // If this is a #elif with a #else before it, report the error. |
| 1681 | if (CondInfo.FoundElse) Diag(Tok, diag::pp_err_elif_after_else); |
| 1682 | |
| 1683 | // If this condition is true, enter it! |
| 1684 | if (ShouldEnter) { |
| 1685 | CondInfo.FoundNonSkip = true; |
| 1686 | break; |
| 1687 | } |
| 1688 | } |
| 1689 | } |
| 1690 | |
| 1691 | CurLexer->ParsingPreprocessorDirective = false; |
| 1692 | // Restore comment saving mode. |
| 1693 | CurLexer->KeepCommentMode = KeepComments; |
| 1694 | } |
| 1695 | |
| 1696 | // Finally, if we are out of the conditional (saw an #endif or ran off the end |
| 1697 | // of the file, just stop skipping and return to lexing whatever came after |
| 1698 | // the #if block. |
| 1699 | CurLexer->LexingRawMode = false; |
| 1700 | } |
| 1701 | |
| 1702 | //===----------------------------------------------------------------------===// |
| 1703 | // Preprocessor Directive Handling. |
| 1704 | //===----------------------------------------------------------------------===// |
| 1705 | |
| 1706 | /// HandleDirective - This callback is invoked when the lexer sees a # token |
| 1707 | /// at the start of a line. This consumes the directive, modifies the |
| 1708 | /// lexer/preprocessor state, and advances the lexer(s) so that the next token |
| 1709 | /// read is the correct one. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 1710 | void Preprocessor::HandleDirective(Token &Result) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1711 | // FIXME: Traditional: # with whitespace before it not recognized by K&R? |
| 1712 | |
| 1713 | // We just parsed a # character at the start of a line, so we're in directive |
| 1714 | // mode. Tell the lexer this so any newlines we see will be converted into an |
| 1715 | // EOM token (which terminates the directive). |
| 1716 | CurLexer->ParsingPreprocessorDirective = true; |
| 1717 | |
| 1718 | ++NumDirectives; |
| 1719 | |
| 1720 | // We are about to read a token. For the multiple-include optimization FA to |
| 1721 | // work, we have to remember if we had read any tokens *before* this |
| 1722 | // pp-directive. |
| 1723 | bool ReadAnyTokensBeforeDirective = CurLexer->MIOpt.getHasReadAnyTokensVal(); |
| 1724 | |
| 1725 | // Read the next token, the directive flavor. This isn't expanded due to |
| 1726 | // C99 6.10.3p8. |
| 1727 | LexUnexpandedToken(Result); |
| 1728 | |
| 1729 | // C99 6.10.3p11: Is this preprocessor directive in macro invocation? e.g.: |
| 1730 | // #define A(x) #x |
| 1731 | // A(abc |
| 1732 | // #warning blah |
| 1733 | // def) |
| 1734 | // If so, the user is relying on non-portable behavior, emit a diagnostic. |
| 1735 | if (InMacroArgs) |
| 1736 | Diag(Result, diag::ext_embedded_directive); |
| 1737 | |
| 1738 | TryAgain: |
| 1739 | switch (Result.getKind()) { |
| 1740 | case tok::eom: |
| 1741 | return; // null directive. |
| 1742 | case tok::comment: |
| 1743 | // Handle stuff like "# /*foo*/ define X" in -E -C mode. |
| 1744 | LexUnexpandedToken(Result); |
| 1745 | goto TryAgain; |
| 1746 | |
| 1747 | case tok::numeric_constant: |
| 1748 | // FIXME: implement # 7 line numbers! |
| 1749 | DiscardUntilEndOfDirective(); |
| 1750 | return; |
| 1751 | default: |
| 1752 | IdentifierInfo *II = Result.getIdentifierInfo(); |
| 1753 | if (II == 0) break; // Not an identifier. |
| 1754 | |
| 1755 | // Ask what the preprocessor keyword ID is. |
| 1756 | switch (II->getPPKeywordID()) { |
| 1757 | default: break; |
| 1758 | // C99 6.10.1 - Conditional Inclusion. |
| 1759 | case tok::pp_if: |
| 1760 | return HandleIfDirective(Result, ReadAnyTokensBeforeDirective); |
| 1761 | case tok::pp_ifdef: |
| 1762 | return HandleIfdefDirective(Result, false, true/*not valid for miopt*/); |
| 1763 | case tok::pp_ifndef: |
| 1764 | return HandleIfdefDirective(Result, true, ReadAnyTokensBeforeDirective); |
| 1765 | case tok::pp_elif: |
| 1766 | return HandleElifDirective(Result); |
| 1767 | case tok::pp_else: |
| 1768 | return HandleElseDirective(Result); |
| 1769 | case tok::pp_endif: |
| 1770 | return HandleEndifDirective(Result); |
| 1771 | |
| 1772 | // C99 6.10.2 - Source File Inclusion. |
| 1773 | case tok::pp_include: |
| 1774 | return HandleIncludeDirective(Result); // Handle #include. |
| 1775 | |
| 1776 | // C99 6.10.3 - Macro Replacement. |
| 1777 | case tok::pp_define: |
| 1778 | return HandleDefineDirective(Result, false); |
| 1779 | case tok::pp_undef: |
| 1780 | return HandleUndefDirective(Result); |
| 1781 | |
| 1782 | // C99 6.10.4 - Line Control. |
| 1783 | case tok::pp_line: |
| 1784 | // FIXME: implement #line |
| 1785 | DiscardUntilEndOfDirective(); |
| 1786 | return; |
| 1787 | |
| 1788 | // C99 6.10.5 - Error Directive. |
| 1789 | case tok::pp_error: |
| 1790 | return HandleUserDiagnosticDirective(Result, false); |
| 1791 | |
| 1792 | // C99 6.10.6 - Pragma Directive. |
| 1793 | case tok::pp_pragma: |
| 1794 | return HandlePragmaDirective(); |
| 1795 | |
| 1796 | // GNU Extensions. |
| 1797 | case tok::pp_import: |
| 1798 | return HandleImportDirective(Result); |
| 1799 | case tok::pp_include_next: |
| 1800 | return HandleIncludeNextDirective(Result); |
| 1801 | |
| 1802 | case tok::pp_warning: |
| 1803 | Diag(Result, diag::ext_pp_warning_directive); |
| 1804 | return HandleUserDiagnosticDirective(Result, true); |
| 1805 | case tok::pp_ident: |
| 1806 | return HandleIdentSCCSDirective(Result); |
| 1807 | case tok::pp_sccs: |
| 1808 | return HandleIdentSCCSDirective(Result); |
| 1809 | case tok::pp_assert: |
| 1810 | //isExtension = true; // FIXME: implement #assert |
| 1811 | break; |
| 1812 | case tok::pp_unassert: |
| 1813 | //isExtension = true; // FIXME: implement #unassert |
| 1814 | break; |
| 1815 | |
| 1816 | // clang extensions. |
| 1817 | case tok::pp_define_target: |
| 1818 | return HandleDefineDirective(Result, true); |
| 1819 | case tok::pp_define_other_target: |
| 1820 | return HandleDefineOtherTargetDirective(Result); |
| 1821 | } |
| 1822 | break; |
| 1823 | } |
| 1824 | |
| 1825 | // If we reached here, the preprocessing token is not valid! |
| 1826 | Diag(Result, diag::err_pp_invalid_directive); |
| 1827 | |
| 1828 | // Read the rest of the PP line. |
| 1829 | DiscardUntilEndOfDirective(); |
| 1830 | |
| 1831 | // Okay, we're done parsing the directive. |
| 1832 | } |
| 1833 | |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 1834 | void Preprocessor::HandleUserDiagnosticDirective(Token &Tok, |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1835 | bool isWarning) { |
| 1836 | // Read the rest of the line raw. We do this because we don't want macros |
| 1837 | // to be expanded and we don't require that the tokens be valid preprocessing |
| 1838 | // tokens. For example, this is allowed: "#warning ` 'foo". GCC does |
| 1839 | // collapse multiple consequtive white space between tokens, but this isn't |
| 1840 | // specified by the standard. |
| 1841 | std::string Message = CurLexer->ReadToEndOfLine(); |
| 1842 | |
| 1843 | unsigned DiagID = isWarning ? diag::pp_hash_warning : diag::err_pp_hash_error; |
| 1844 | return Diag(Tok, DiagID, Message); |
| 1845 | } |
| 1846 | |
| 1847 | /// HandleIdentSCCSDirective - Handle a #ident/#sccs directive. |
| 1848 | /// |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 1849 | void Preprocessor::HandleIdentSCCSDirective(Token &Tok) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1850 | // Yes, this directive is an extension. |
| 1851 | Diag(Tok, diag::ext_pp_ident_directive); |
| 1852 | |
| 1853 | // Read the string argument. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 1854 | Token StrTok; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1855 | Lex(StrTok); |
| 1856 | |
| 1857 | // If the token kind isn't a string, it's a malformed directive. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 1858 | if (StrTok.isNot(tok::string_literal) && |
| 1859 | StrTok.isNot(tok::wide_string_literal)) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1860 | return Diag(StrTok, diag::err_pp_malformed_ident); |
| 1861 | |
| 1862 | // Verify that there is nothing after the string, other than EOM. |
| 1863 | CheckEndOfDirective("#ident"); |
| 1864 | |
| 1865 | if (Callbacks) |
| 1866 | Callbacks->Ident(Tok.getLocation(), getSpelling(StrTok)); |
| 1867 | } |
| 1868 | |
| 1869 | //===----------------------------------------------------------------------===// |
| 1870 | // Preprocessor Include Directive Handling. |
| 1871 | //===----------------------------------------------------------------------===// |
| 1872 | |
| 1873 | /// GetIncludeFilenameSpelling - Turn the specified lexer token into a fully |
| 1874 | /// checked and spelled filename, e.g. as an operand of #include. This returns |
| 1875 | /// true if the input filename was in <>'s or false if it were in ""'s. The |
| 1876 | /// caller is expected to provide a buffer that is large enough to hold the |
| 1877 | /// spelling of the filename, but is also expected to handle the case when |
| 1878 | /// this method decides to use a different buffer. |
Chris Lattner | f1c99ac | 2007-07-23 04:15:27 +0000 | [diff] [blame] | 1879 | bool Preprocessor::GetIncludeFilenameSpelling(SourceLocation Loc, |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1880 | const char *&BufStart, |
| 1881 | const char *&BufEnd) { |
| 1882 | // Get the text form of the filename. |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1883 | assert(BufStart != BufEnd && "Can't have tokens with empty spellings!"); |
| 1884 | |
| 1885 | // Make sure the filename is <x> or "x". |
| 1886 | bool isAngled; |
| 1887 | if (BufStart[0] == '<') { |
| 1888 | if (BufEnd[-1] != '>') { |
Chris Lattner | f1c99ac | 2007-07-23 04:15:27 +0000 | [diff] [blame] | 1889 | Diag(Loc, diag::err_pp_expects_filename); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1890 | BufStart = 0; |
| 1891 | return true; |
| 1892 | } |
| 1893 | isAngled = true; |
| 1894 | } else if (BufStart[0] == '"') { |
| 1895 | if (BufEnd[-1] != '"') { |
Chris Lattner | f1c99ac | 2007-07-23 04:15:27 +0000 | [diff] [blame] | 1896 | Diag(Loc, diag::err_pp_expects_filename); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1897 | BufStart = 0; |
| 1898 | return true; |
| 1899 | } |
| 1900 | isAngled = false; |
| 1901 | } else { |
Chris Lattner | f1c99ac | 2007-07-23 04:15:27 +0000 | [diff] [blame] | 1902 | Diag(Loc, diag::err_pp_expects_filename); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1903 | BufStart = 0; |
| 1904 | return true; |
| 1905 | } |
| 1906 | |
| 1907 | // Diagnose #include "" as invalid. |
| 1908 | if (BufEnd-BufStart <= 2) { |
Chris Lattner | f1c99ac | 2007-07-23 04:15:27 +0000 | [diff] [blame] | 1909 | Diag(Loc, diag::err_pp_empty_filename); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1910 | BufStart = 0; |
| 1911 | return ""; |
| 1912 | } |
| 1913 | |
| 1914 | // Skip the brackets. |
| 1915 | ++BufStart; |
| 1916 | --BufEnd; |
| 1917 | return isAngled; |
| 1918 | } |
| 1919 | |
Chris Lattner | 706ab50 | 2007-07-23 04:56:47 +0000 | [diff] [blame] | 1920 | /// ConcatenateIncludeName - Handle cases where the #include name is expanded |
| 1921 | /// from a macro as multiple tokens, which need to be glued together. This |
| 1922 | /// occurs for code like: |
| 1923 | /// #define FOO <a/b.h> |
| 1924 | /// #include FOO |
| 1925 | /// because in this case, "<a/b.h>" is returned as 7 tokens, not one. |
| 1926 | /// |
| 1927 | /// This code concatenates and consumes tokens up to the '>' token. It returns |
| 1928 | /// false if the > was found, otherwise it returns true if it finds and consumes |
| 1929 | /// the EOM marker. |
| 1930 | static bool ConcatenateIncludeName(llvm::SmallVector<char, 128> &FilenameBuffer, |
| 1931 | Preprocessor &PP) { |
| 1932 | Token CurTok; |
| 1933 | |
| 1934 | PP.Lex(CurTok); |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 1935 | while (CurTok.isNot(tok::eom)) { |
Chris Lattner | 706ab50 | 2007-07-23 04:56:47 +0000 | [diff] [blame] | 1936 | // Append the spelling of this token to the buffer. If there was a space |
| 1937 | // before it, add it now. |
| 1938 | if (CurTok.hasLeadingSpace()) |
| 1939 | FilenameBuffer.push_back(' '); |
| 1940 | |
| 1941 | // Get the spelling of the token, directly into FilenameBuffer if possible. |
| 1942 | unsigned PreAppendSize = FilenameBuffer.size(); |
| 1943 | FilenameBuffer.resize(PreAppendSize+CurTok.getLength()); |
| 1944 | |
| 1945 | const char *BufPtr = &FilenameBuffer[PreAppendSize]; |
| 1946 | unsigned ActualLen = PP.getSpelling(CurTok, BufPtr); |
| 1947 | |
| 1948 | // If the token was spelled somewhere else, copy it into FilenameBuffer. |
| 1949 | if (BufPtr != &FilenameBuffer[PreAppendSize]) |
| 1950 | memcpy(&FilenameBuffer[PreAppendSize], BufPtr, ActualLen); |
| 1951 | |
| 1952 | // Resize FilenameBuffer to the correct size. |
| 1953 | if (CurTok.getLength() != ActualLen) |
| 1954 | FilenameBuffer.resize(PreAppendSize+ActualLen); |
| 1955 | |
| 1956 | // If we found the '>' marker, return success. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 1957 | if (CurTok.is(tok::greater)) |
Chris Lattner | 706ab50 | 2007-07-23 04:56:47 +0000 | [diff] [blame] | 1958 | return false; |
| 1959 | |
| 1960 | PP.Lex(CurTok); |
| 1961 | } |
| 1962 | |
| 1963 | // If we hit the eom marker, emit an error and return true so that the caller |
| 1964 | // knows the EOM has been read. |
| 1965 | PP.Diag(CurTok.getLocation(), diag::err_pp_expects_filename); |
| 1966 | return true; |
| 1967 | } |
| 1968 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1969 | /// HandleIncludeDirective - The "#include" tokens have just been read, read the |
| 1970 | /// file to be included from the lexer, then include it! This is a common |
| 1971 | /// routine with functionality shared between #include, #include_next and |
| 1972 | /// #import. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 1973 | void Preprocessor::HandleIncludeDirective(Token &IncludeTok, |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1974 | const DirectoryLookup *LookupFrom, |
| 1975 | bool isImport) { |
| 1976 | |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 1977 | Token FilenameTok; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1978 | CurLexer->LexIncludeFilename(FilenameTok); |
| 1979 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1980 | // Reserve a buffer to get the spelling. |
| 1981 | llvm::SmallVector<char, 128> FilenameBuffer; |
Chris Lattner | 706ab50 | 2007-07-23 04:56:47 +0000 | [diff] [blame] | 1982 | const char *FilenameStart, *FilenameEnd; |
| 1983 | |
| 1984 | switch (FilenameTok.getKind()) { |
| 1985 | case tok::eom: |
| 1986 | // If the token kind is EOM, the error has already been diagnosed. |
| 1987 | return; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 1988 | |
Chris Lattner | 706ab50 | 2007-07-23 04:56:47 +0000 | [diff] [blame] | 1989 | case tok::angle_string_literal: |
Chris Lattner | f11ccfc | 2007-07-23 22:23:52 +0000 | [diff] [blame] | 1990 | case tok::string_literal: { |
Chris Lattner | 706ab50 | 2007-07-23 04:56:47 +0000 | [diff] [blame] | 1991 | FilenameBuffer.resize(FilenameTok.getLength()); |
| 1992 | FilenameStart = &FilenameBuffer[0]; |
| 1993 | unsigned Len = getSpelling(FilenameTok, FilenameStart); |
| 1994 | FilenameEnd = FilenameStart+Len; |
| 1995 | break; |
Chris Lattner | f11ccfc | 2007-07-23 22:23:52 +0000 | [diff] [blame] | 1996 | } |
Chris Lattner | 706ab50 | 2007-07-23 04:56:47 +0000 | [diff] [blame] | 1997 | |
| 1998 | case tok::less: |
| 1999 | // This could be a <foo/bar.h> file coming from a macro expansion. In this |
| 2000 | // case, glue the tokens together into FilenameBuffer and interpret those. |
| 2001 | FilenameBuffer.push_back('<'); |
| 2002 | if (ConcatenateIncludeName(FilenameBuffer, *this)) |
| 2003 | return; // Found <eom> but no ">"? Diagnostic already emitted. |
| 2004 | FilenameStart = &FilenameBuffer[0]; |
| 2005 | FilenameEnd = &FilenameBuffer[FilenameBuffer.size()]; |
| 2006 | break; |
| 2007 | default: |
| 2008 | Diag(FilenameTok.getLocation(), diag::err_pp_expects_filename); |
| 2009 | DiscardUntilEndOfDirective(); |
| 2010 | return; |
| 2011 | } |
| 2012 | |
Chris Lattner | f1c99ac | 2007-07-23 04:15:27 +0000 | [diff] [blame] | 2013 | bool isAngled = GetIncludeFilenameSpelling(FilenameTok.getLocation(), |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2014 | FilenameStart, FilenameEnd); |
| 2015 | // If GetIncludeFilenameSpelling set the start ptr to null, there was an |
| 2016 | // error. |
Chris Lattner | 706ab50 | 2007-07-23 04:56:47 +0000 | [diff] [blame] | 2017 | if (FilenameStart == 0) { |
| 2018 | DiscardUntilEndOfDirective(); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2019 | return; |
Chris Lattner | 706ab50 | 2007-07-23 04:56:47 +0000 | [diff] [blame] | 2020 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2021 | |
| 2022 | // Verify that there is nothing after the filename, other than EOM. Use the |
| 2023 | // preprocessor to lex this in case lexing the filename entered a macro. |
| 2024 | CheckEndOfDirective("#include"); |
| 2025 | |
| 2026 | // Check that we don't have infinite #include recursion. |
| 2027 | if (IncludeMacroStack.size() == MaxAllowedIncludeStackDepth-1) |
| 2028 | return Diag(FilenameTok, diag::err_pp_include_too_deep); |
| 2029 | |
| 2030 | // Search include directories. |
| 2031 | const DirectoryLookup *CurDir; |
| 2032 | const FileEntry *File = LookupFile(FilenameStart, FilenameEnd, |
| 2033 | isAngled, LookupFrom, CurDir); |
| 2034 | if (File == 0) |
| 2035 | return Diag(FilenameTok, diag::err_pp_file_not_found, |
| 2036 | std::string(FilenameStart, FilenameEnd)); |
| 2037 | |
| 2038 | // Ask HeaderInfo if we should enter this #include file. |
| 2039 | if (!HeaderInfo.ShouldEnterIncludeFile(File, isImport)) { |
| 2040 | // If it returns true, #including this file will have no effect. |
| 2041 | return; |
| 2042 | } |
| 2043 | |
| 2044 | // Look up the file, create a File ID for it. |
| 2045 | unsigned FileID = SourceMgr.createFileID(File, FilenameTok.getLocation()); |
| 2046 | if (FileID == 0) |
| 2047 | return Diag(FilenameTok, diag::err_pp_file_not_found, |
| 2048 | std::string(FilenameStart, FilenameEnd)); |
| 2049 | |
| 2050 | // Finally, if all is good, enter the new file! |
| 2051 | EnterSourceFile(FileID, CurDir); |
| 2052 | } |
| 2053 | |
| 2054 | /// HandleIncludeNextDirective - Implements #include_next. |
| 2055 | /// |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 2056 | void Preprocessor::HandleIncludeNextDirective(Token &IncludeNextTok) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2057 | Diag(IncludeNextTok, diag::ext_pp_include_next_directive); |
| 2058 | |
| 2059 | // #include_next is like #include, except that we start searching after |
| 2060 | // the current found directory. If we can't do this, issue a |
| 2061 | // diagnostic. |
| 2062 | const DirectoryLookup *Lookup = CurDirLookup; |
| 2063 | if (isInPrimaryFile()) { |
| 2064 | Lookup = 0; |
| 2065 | Diag(IncludeNextTok, diag::pp_include_next_in_primary); |
| 2066 | } else if (Lookup == 0) { |
| 2067 | Diag(IncludeNextTok, diag::pp_include_next_absolute_path); |
| 2068 | } else { |
| 2069 | // Start looking up in the next directory. |
| 2070 | ++Lookup; |
| 2071 | } |
| 2072 | |
| 2073 | return HandleIncludeDirective(IncludeNextTok, Lookup); |
| 2074 | } |
| 2075 | |
| 2076 | /// HandleImportDirective - Implements #import. |
| 2077 | /// |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 2078 | void Preprocessor::HandleImportDirective(Token &ImportTok) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2079 | Diag(ImportTok, diag::ext_pp_import_directive); |
| 2080 | |
| 2081 | return HandleIncludeDirective(ImportTok, 0, true); |
| 2082 | } |
| 2083 | |
| 2084 | //===----------------------------------------------------------------------===// |
| 2085 | // Preprocessor Macro Directive Handling. |
| 2086 | //===----------------------------------------------------------------------===// |
| 2087 | |
| 2088 | /// ReadMacroDefinitionArgList - The ( starting an argument list of a macro |
| 2089 | /// definition has just been read. Lex the rest of the arguments and the |
| 2090 | /// closing ), updating MI with what we learn. Return true if an error occurs |
| 2091 | /// parsing the arg list. |
| 2092 | bool Preprocessor::ReadMacroDefinitionArgList(MacroInfo *MI) { |
Chris Lattner | 25c9648 | 2007-07-14 22:46:43 +0000 | [diff] [blame] | 2093 | llvm::SmallVector<IdentifierInfo*, 32> Arguments; |
| 2094 | |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 2095 | Token Tok; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2096 | while (1) { |
| 2097 | LexUnexpandedToken(Tok); |
| 2098 | switch (Tok.getKind()) { |
| 2099 | case tok::r_paren: |
| 2100 | // Found the end of the argument list. |
Chris Lattner | 25c9648 | 2007-07-14 22:46:43 +0000 | [diff] [blame] | 2101 | if (Arguments.empty()) { // #define FOO() |
| 2102 | MI->setArgumentList(Arguments.begin(), Arguments.end()); |
| 2103 | return false; |
| 2104 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2105 | // Otherwise we have #define FOO(A,) |
| 2106 | Diag(Tok, diag::err_pp_expected_ident_in_arg_list); |
| 2107 | return true; |
| 2108 | case tok::ellipsis: // #define X(... -> C99 varargs |
| 2109 | // Warn if use of C99 feature in non-C99 mode. |
| 2110 | if (!Features.C99) Diag(Tok, diag::ext_variadic_macro); |
| 2111 | |
| 2112 | // Lex the token after the identifier. |
| 2113 | LexUnexpandedToken(Tok); |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 2114 | if (Tok.isNot(tok::r_paren)) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2115 | Diag(Tok, diag::err_pp_missing_rparen_in_macro_def); |
| 2116 | return true; |
| 2117 | } |
| 2118 | // Add the __VA_ARGS__ identifier as an argument. |
Chris Lattner | 25c9648 | 2007-07-14 22:46:43 +0000 | [diff] [blame] | 2119 | Arguments.push_back(Ident__VA_ARGS__); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2120 | MI->setIsC99Varargs(); |
Chris Lattner | 25c9648 | 2007-07-14 22:46:43 +0000 | [diff] [blame] | 2121 | MI->setArgumentList(Arguments.begin(), Arguments.end()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2122 | return false; |
| 2123 | case tok::eom: // #define X( |
| 2124 | Diag(Tok, diag::err_pp_missing_rparen_in_macro_def); |
| 2125 | return true; |
| 2126 | default: |
| 2127 | // Handle keywords and identifiers here to accept things like |
| 2128 | // #define Foo(for) for. |
| 2129 | IdentifierInfo *II = Tok.getIdentifierInfo(); |
| 2130 | if (II == 0) { |
| 2131 | // #define X(1 |
| 2132 | Diag(Tok, diag::err_pp_invalid_tok_in_arg_list); |
| 2133 | return true; |
| 2134 | } |
| 2135 | |
| 2136 | // If this is already used as an argument, it is used multiple times (e.g. |
| 2137 | // #define X(A,A. |
Chris Lattner | 25c9648 | 2007-07-14 22:46:43 +0000 | [diff] [blame] | 2138 | if (std::find(Arguments.begin(), Arguments.end(), II) != |
| 2139 | Arguments.end()) { // C99 6.10.3p6 |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2140 | Diag(Tok, diag::err_pp_duplicate_name_in_arg_list, II->getName()); |
| 2141 | return true; |
| 2142 | } |
| 2143 | |
| 2144 | // Add the argument to the macro info. |
Chris Lattner | 25c9648 | 2007-07-14 22:46:43 +0000 | [diff] [blame] | 2145 | Arguments.push_back(II); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2146 | |
| 2147 | // Lex the token after the identifier. |
| 2148 | LexUnexpandedToken(Tok); |
| 2149 | |
| 2150 | switch (Tok.getKind()) { |
| 2151 | default: // #define X(A B |
| 2152 | Diag(Tok, diag::err_pp_expected_comma_in_arg_list); |
| 2153 | return true; |
| 2154 | case tok::r_paren: // #define X(A) |
Chris Lattner | 25c9648 | 2007-07-14 22:46:43 +0000 | [diff] [blame] | 2155 | MI->setArgumentList(Arguments.begin(), Arguments.end()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2156 | return false; |
| 2157 | case tok::comma: // #define X(A, |
| 2158 | break; |
| 2159 | case tok::ellipsis: // #define X(A... -> GCC extension |
| 2160 | // Diagnose extension. |
| 2161 | Diag(Tok, diag::ext_named_variadic_macro); |
| 2162 | |
| 2163 | // Lex the token after the identifier. |
| 2164 | LexUnexpandedToken(Tok); |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 2165 | if (Tok.isNot(tok::r_paren)) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2166 | Diag(Tok, diag::err_pp_missing_rparen_in_macro_def); |
| 2167 | return true; |
| 2168 | } |
| 2169 | |
| 2170 | MI->setIsGNUVarargs(); |
Chris Lattner | 25c9648 | 2007-07-14 22:46:43 +0000 | [diff] [blame] | 2171 | MI->setArgumentList(Arguments.begin(), Arguments.end()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2172 | return false; |
| 2173 | } |
| 2174 | } |
| 2175 | } |
| 2176 | } |
| 2177 | |
| 2178 | /// HandleDefineDirective - Implements #define. This consumes the entire macro |
| 2179 | /// line then lets the caller lex the next real token. If 'isTargetSpecific' is |
| 2180 | /// true, then this is a "#define_target", otherwise this is a "#define". |
| 2181 | /// |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 2182 | void Preprocessor::HandleDefineDirective(Token &DefineTok, |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2183 | bool isTargetSpecific) { |
| 2184 | ++NumDefined; |
| 2185 | |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 2186 | Token MacroNameTok; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2187 | ReadMacroName(MacroNameTok, 1); |
| 2188 | |
| 2189 | // Error reading macro name? If so, diagnostic already issued. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 2190 | if (MacroNameTok.is(tok::eom)) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2191 | return; |
Chris Lattner | c215bd6 | 2007-07-14 22:11:41 +0000 | [diff] [blame] | 2192 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2193 | // If we are supposed to keep comments in #defines, reenable comment saving |
| 2194 | // mode. |
| 2195 | CurLexer->KeepCommentMode = KeepMacroComments; |
| 2196 | |
| 2197 | // Create the new macro. |
| 2198 | MacroInfo *MI = new MacroInfo(MacroNameTok.getLocation()); |
| 2199 | if (isTargetSpecific) MI->setIsTargetSpecific(); |
| 2200 | |
| 2201 | // If the identifier is an 'other target' macro, clear this bit. |
| 2202 | MacroNameTok.getIdentifierInfo()->setIsOtherTargetMacro(false); |
| 2203 | |
| 2204 | |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 2205 | Token Tok; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2206 | LexUnexpandedToken(Tok); |
| 2207 | |
| 2208 | // If this is a function-like macro definition, parse the argument list, |
| 2209 | // marking each of the identifiers as being used as macro arguments. Also, |
| 2210 | // check other constraints on the first token of the macro body. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 2211 | if (Tok.is(tok::eom)) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2212 | // If there is no body to this macro, we have no special handling here. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 2213 | } else if (Tok.is(tok::l_paren) && !Tok.hasLeadingSpace()) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2214 | // This is a function-like macro definition. Read the argument list. |
| 2215 | MI->setIsFunctionLike(); |
| 2216 | if (ReadMacroDefinitionArgList(MI)) { |
| 2217 | // Forget about MI. |
| 2218 | delete MI; |
| 2219 | // Throw away the rest of the line. |
| 2220 | if (CurLexer->ParsingPreprocessorDirective) |
| 2221 | DiscardUntilEndOfDirective(); |
| 2222 | return; |
| 2223 | } |
| 2224 | |
| 2225 | // Read the first token after the arg list for down below. |
| 2226 | LexUnexpandedToken(Tok); |
| 2227 | } else if (!Tok.hasLeadingSpace()) { |
| 2228 | // C99 requires whitespace between the macro definition and the body. Emit |
| 2229 | // a diagnostic for something like "#define X+". |
| 2230 | if (Features.C99) { |
| 2231 | Diag(Tok, diag::ext_c99_whitespace_required_after_macro_name); |
| 2232 | } else { |
| 2233 | // FIXME: C90/C++ do not get this diagnostic, but it does get a similar |
| 2234 | // one in some cases! |
| 2235 | } |
| 2236 | } else { |
| 2237 | // This is a normal token with leading space. Clear the leading space |
| 2238 | // marker on the first token to get proper expansion. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 2239 | Tok.clearFlag(Token::LeadingSpace); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2240 | } |
| 2241 | |
| 2242 | // If this is a definition of a variadic C99 function-like macro, not using |
| 2243 | // the GNU named varargs extension, enabled __VA_ARGS__. |
| 2244 | |
| 2245 | // "Poison" __VA_ARGS__, which can only appear in the expansion of a macro. |
| 2246 | // This gets unpoisoned where it is allowed. |
| 2247 | assert(Ident__VA_ARGS__->isPoisoned() && "__VA_ARGS__ should be poisoned!"); |
| 2248 | if (MI->isC99Varargs()) |
| 2249 | Ident__VA_ARGS__->setIsPoisoned(false); |
| 2250 | |
| 2251 | // Read the rest of the macro body. |
Chris Lattner | b5e240f | 2007-07-14 21:54:03 +0000 | [diff] [blame] | 2252 | if (MI->isObjectLike()) { |
| 2253 | // Object-like macros are very simple, just read their body. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 2254 | while (Tok.isNot(tok::eom)) { |
Chris Lattner | b5e240f | 2007-07-14 21:54:03 +0000 | [diff] [blame] | 2255 | MI->AddTokenToBody(Tok); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2256 | // Get the next token of the macro. |
| 2257 | LexUnexpandedToken(Tok); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2258 | } |
| 2259 | |
Chris Lattner | b5e240f | 2007-07-14 21:54:03 +0000 | [diff] [blame] | 2260 | } else { |
| 2261 | // Otherwise, read the body of a function-like macro. This has to validate |
| 2262 | // the # (stringize) operator. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 2263 | while (Tok.isNot(tok::eom)) { |
Chris Lattner | b5e240f | 2007-07-14 21:54:03 +0000 | [diff] [blame] | 2264 | MI->AddTokenToBody(Tok); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2265 | |
Chris Lattner | b5e240f | 2007-07-14 21:54:03 +0000 | [diff] [blame] | 2266 | // Check C99 6.10.3.2p1: ensure that # operators are followed by macro |
| 2267 | // parameters in function-like macro expansions. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 2268 | if (Tok.isNot(tok::hash)) { |
Chris Lattner | b5e240f | 2007-07-14 21:54:03 +0000 | [diff] [blame] | 2269 | // Get the next token of the macro. |
| 2270 | LexUnexpandedToken(Tok); |
| 2271 | continue; |
| 2272 | } |
| 2273 | |
| 2274 | // Get the next token of the macro. |
| 2275 | LexUnexpandedToken(Tok); |
| 2276 | |
| 2277 | // Not a macro arg identifier? |
| 2278 | if (!Tok.getIdentifierInfo() || |
| 2279 | MI->getArgumentNum(Tok.getIdentifierInfo()) == -1) { |
| 2280 | Diag(Tok, diag::err_pp_stringize_not_parameter); |
| 2281 | delete MI; |
| 2282 | |
| 2283 | // Disable __VA_ARGS__ again. |
| 2284 | Ident__VA_ARGS__->setIsPoisoned(true); |
| 2285 | return; |
| 2286 | } |
| 2287 | |
| 2288 | // Things look ok, add the param name token to the macro. |
| 2289 | MI->AddTokenToBody(Tok); |
| 2290 | |
| 2291 | // Get the next token of the macro. |
| 2292 | LexUnexpandedToken(Tok); |
| 2293 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2294 | } |
| 2295 | |
Chris Lattner | c215bd6 | 2007-07-14 22:11:41 +0000 | [diff] [blame] | 2296 | |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2297 | // Disable __VA_ARGS__ again. |
| 2298 | Ident__VA_ARGS__->setIsPoisoned(true); |
| 2299 | |
| 2300 | // Check that there is no paste (##) operator at the begining or end of the |
| 2301 | // replacement list. |
| 2302 | unsigned NumTokens = MI->getNumTokens(); |
| 2303 | if (NumTokens != 0) { |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 2304 | if (MI->getReplacementToken(0).is(tok::hashhash)) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2305 | Diag(MI->getReplacementToken(0), diag::err_paste_at_start); |
| 2306 | delete MI; |
| 2307 | return; |
| 2308 | } |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 2309 | if (MI->getReplacementToken(NumTokens-1).is(tok::hashhash)) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2310 | Diag(MI->getReplacementToken(NumTokens-1), diag::err_paste_at_end); |
| 2311 | delete MI; |
| 2312 | return; |
| 2313 | } |
| 2314 | } |
| 2315 | |
| 2316 | // If this is the primary source file, remember that this macro hasn't been |
| 2317 | // used yet. |
| 2318 | if (isInPrimaryFile()) |
| 2319 | MI->setIsUsed(false); |
| 2320 | |
| 2321 | // Finally, if this identifier already had a macro defined for it, verify that |
| 2322 | // the macro bodies are identical and free the old definition. |
Chris Lattner | cc1a875 | 2007-10-07 08:44:20 +0000 | [diff] [blame] | 2323 | if (MacroInfo *OtherMI = getMacroInfo(MacroNameTok.getIdentifierInfo())) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2324 | if (!OtherMI->isUsed()) |
| 2325 | Diag(OtherMI->getDefinitionLoc(), diag::pp_macro_not_used); |
| 2326 | |
| 2327 | // Macros must be identical. This means all tokes and whitespace separation |
| 2328 | // must be the same. C99 6.10.3.2. |
| 2329 | if (!MI->isIdenticalTo(*OtherMI, *this)) { |
| 2330 | Diag(MI->getDefinitionLoc(), diag::ext_pp_macro_redef, |
| 2331 | MacroNameTok.getIdentifierInfo()->getName()); |
| 2332 | Diag(OtherMI->getDefinitionLoc(), diag::ext_pp_macro_redef2); |
| 2333 | } |
| 2334 | delete OtherMI; |
| 2335 | } |
| 2336 | |
Chris Lattner | cc1a875 | 2007-10-07 08:44:20 +0000 | [diff] [blame] | 2337 | setMacroInfo(MacroNameTok.getIdentifierInfo(), MI); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2338 | } |
| 2339 | |
| 2340 | /// HandleDefineOtherTargetDirective - Implements #define_other_target. |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 2341 | void Preprocessor::HandleDefineOtherTargetDirective(Token &Tok) { |
| 2342 | Token MacroNameTok; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2343 | ReadMacroName(MacroNameTok, 1); |
| 2344 | |
| 2345 | // Error reading macro name? If so, diagnostic already issued. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 2346 | if (MacroNameTok.is(tok::eom)) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2347 | return; |
| 2348 | |
| 2349 | // Check to see if this is the last token on the #undef line. |
| 2350 | CheckEndOfDirective("#define_other_target"); |
| 2351 | |
| 2352 | // If there is already a macro defined by this name, turn it into a |
| 2353 | // target-specific define. |
Chris Lattner | cc1a875 | 2007-10-07 08:44:20 +0000 | [diff] [blame] | 2354 | if (MacroInfo *MI = getMacroInfo(MacroNameTok.getIdentifierInfo())) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2355 | MI->setIsTargetSpecific(true); |
| 2356 | return; |
| 2357 | } |
| 2358 | |
| 2359 | // Mark the identifier as being a macro on some other target. |
| 2360 | MacroNameTok.getIdentifierInfo()->setIsOtherTargetMacro(); |
| 2361 | } |
| 2362 | |
| 2363 | |
| 2364 | /// HandleUndefDirective - Implements #undef. |
| 2365 | /// |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 2366 | void Preprocessor::HandleUndefDirective(Token &UndefTok) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2367 | ++NumUndefined; |
| 2368 | |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 2369 | Token MacroNameTok; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2370 | ReadMacroName(MacroNameTok, 2); |
| 2371 | |
| 2372 | // Error reading macro name? If so, diagnostic already issued. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 2373 | if (MacroNameTok.is(tok::eom)) |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2374 | return; |
| 2375 | |
| 2376 | // Check to see if this is the last token on the #undef line. |
| 2377 | CheckEndOfDirective("#undef"); |
| 2378 | |
| 2379 | // Okay, we finally have a valid identifier to undef. |
Chris Lattner | cc1a875 | 2007-10-07 08:44:20 +0000 | [diff] [blame] | 2380 | MacroInfo *MI = getMacroInfo(MacroNameTok.getIdentifierInfo()); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2381 | |
| 2382 | // #undef untaints an identifier if it were marked by define_other_target. |
| 2383 | MacroNameTok.getIdentifierInfo()->setIsOtherTargetMacro(false); |
| 2384 | |
| 2385 | // If the macro is not defined, this is a noop undef, just return. |
| 2386 | if (MI == 0) return; |
| 2387 | |
| 2388 | if (!MI->isUsed()) |
| 2389 | Diag(MI->getDefinitionLoc(), diag::pp_macro_not_used); |
| 2390 | |
| 2391 | // Free macro definition. |
| 2392 | delete MI; |
Chris Lattner | cc1a875 | 2007-10-07 08:44:20 +0000 | [diff] [blame] | 2393 | setMacroInfo(MacroNameTok.getIdentifierInfo(), 0); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2394 | } |
| 2395 | |
| 2396 | |
| 2397 | //===----------------------------------------------------------------------===// |
| 2398 | // Preprocessor Conditional Directive Handling. |
| 2399 | //===----------------------------------------------------------------------===// |
| 2400 | |
| 2401 | /// HandleIfdefDirective - Implements the #ifdef/#ifndef directive. isIfndef is |
| 2402 | /// true when this is a #ifndef directive. ReadAnyTokensBeforeDirective is true |
| 2403 | /// if any tokens have been returned or pp-directives activated before this |
| 2404 | /// #ifndef has been lexed. |
| 2405 | /// |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 2406 | void Preprocessor::HandleIfdefDirective(Token &Result, bool isIfndef, |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2407 | bool ReadAnyTokensBeforeDirective) { |
| 2408 | ++NumIf; |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 2409 | Token DirectiveTok = Result; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2410 | |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 2411 | Token MacroNameTok; |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2412 | ReadMacroName(MacroNameTok); |
| 2413 | |
| 2414 | // Error reading macro name? If so, diagnostic already issued. |
Chris Lattner | 22f6bbc | 2007-10-09 18:02:16 +0000 | [diff] [blame] | 2415 | if (MacroNameTok.is(tok::eom)) { |
Chris Lattner | f37bb25 | 2007-09-24 05:14:57 +0000 | [diff] [blame] | 2416 | // Skip code until we get to #endif. This helps with recovery by not |
| 2417 | // emitting an error when the #endif is reached. |
| 2418 | SkipExcludedConditionalBlock(DirectiveTok.getLocation(), |
| 2419 | /*Foundnonskip*/false, /*FoundElse*/false); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2420 | return; |
Chris Lattner | f37bb25 | 2007-09-24 05:14:57 +0000 | [diff] [blame] | 2421 | } |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2422 | |
| 2423 | // Check to see if this is the last token on the #if[n]def line. |
| 2424 | CheckEndOfDirective(isIfndef ? "#ifndef" : "#ifdef"); |
| 2425 | |
| 2426 | // If the start of a top-level #ifdef, inform MIOpt. |
| 2427 | if (!ReadAnyTokensBeforeDirective && |
| 2428 | CurLexer->getConditionalStackDepth() == 0) { |
| 2429 | assert(isIfndef && "#ifdef shouldn't reach here"); |
| 2430 | CurLexer->MIOpt.EnterTopLevelIFNDEF(MacroNameTok.getIdentifierInfo()); |
| 2431 | } |
| 2432 | |
| 2433 | IdentifierInfo *MII = MacroNameTok.getIdentifierInfo(); |
Chris Lattner | cc1a875 | 2007-10-07 08:44:20 +0000 | [diff] [blame] | 2434 | MacroInfo *MI = getMacroInfo(MII); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2435 | |
| 2436 | // If there is a macro, process it. |
| 2437 | if (MI) { |
| 2438 | // Mark it used. |
| 2439 | MI->setIsUsed(true); |
| 2440 | |
| 2441 | // If this is the first use of a target-specific macro, warn about it. |
| 2442 | if (MI->isTargetSpecific()) { |
| 2443 | MI->setIsTargetSpecific(false); // Don't warn on second use. |
Ted Kremenek | 9c728dc | 2007-12-12 22:39:36 +0000 | [diff] [blame] | 2444 | getTargetInfo().DiagnoseNonPortability( |
| 2445 | getFullLoc(MacroNameTok.getLocation()), |
| 2446 | diag::port_target_macro_use); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2447 | } |
| 2448 | } else { |
| 2449 | // Use of a target-specific macro for some other target? If so, warn. |
| 2450 | if (MII->isOtherTargetMacro()) { |
| 2451 | MII->setIsOtherTargetMacro(false); // Don't warn on second use. |
Ted Kremenek | 9c728dc | 2007-12-12 22:39:36 +0000 | [diff] [blame] | 2452 | getTargetInfo().DiagnoseNonPortability( |
| 2453 | getFullLoc(MacroNameTok.getLocation()), |
| 2454 | diag::port_target_macro_use); |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2455 | } |
| 2456 | } |
| 2457 | |
| 2458 | // Should we include the stuff contained by this directive? |
| 2459 | if (!MI == isIfndef) { |
| 2460 | // Yes, remember that we are inside a conditional, then lex the next token. |
| 2461 | CurLexer->pushConditionalLevel(DirectiveTok.getLocation(), /*wasskip*/false, |
| 2462 | /*foundnonskip*/true, /*foundelse*/false); |
| 2463 | } else { |
| 2464 | // No, skip the contents of this block and return the first token after it. |
| 2465 | SkipExcludedConditionalBlock(DirectiveTok.getLocation(), |
| 2466 | /*Foundnonskip*/false, |
| 2467 | /*FoundElse*/false); |
| 2468 | } |
| 2469 | } |
| 2470 | |
| 2471 | /// HandleIfDirective - Implements the #if directive. |
| 2472 | /// |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 2473 | void Preprocessor::HandleIfDirective(Token &IfToken, |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2474 | bool ReadAnyTokensBeforeDirective) { |
| 2475 | ++NumIf; |
| 2476 | |
| 2477 | // Parse and evaluation the conditional expression. |
| 2478 | IdentifierInfo *IfNDefMacro = 0; |
| 2479 | bool ConditionalTrue = EvaluateDirectiveExpression(IfNDefMacro); |
| 2480 | |
| 2481 | // Should we include the stuff contained by this directive? |
| 2482 | if (ConditionalTrue) { |
| 2483 | // If this condition is equivalent to #ifndef X, and if this is the first |
| 2484 | // directive seen, handle it for the multiple-include optimization. |
| 2485 | if (!ReadAnyTokensBeforeDirective && |
| 2486 | CurLexer->getConditionalStackDepth() == 0 && IfNDefMacro) |
| 2487 | CurLexer->MIOpt.EnterTopLevelIFNDEF(IfNDefMacro); |
| 2488 | |
| 2489 | // Yes, remember that we are inside a conditional, then lex the next token. |
| 2490 | CurLexer->pushConditionalLevel(IfToken.getLocation(), /*wasskip*/false, |
| 2491 | /*foundnonskip*/true, /*foundelse*/false); |
| 2492 | } else { |
| 2493 | // No, skip the contents of this block and return the first token after it. |
| 2494 | SkipExcludedConditionalBlock(IfToken.getLocation(), /*Foundnonskip*/false, |
| 2495 | /*FoundElse*/false); |
| 2496 | } |
| 2497 | } |
| 2498 | |
| 2499 | /// HandleEndifDirective - Implements the #endif directive. |
| 2500 | /// |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 2501 | void Preprocessor::HandleEndifDirective(Token &EndifToken) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2502 | ++NumEndif; |
| 2503 | |
| 2504 | // Check that this is the whole directive. |
| 2505 | CheckEndOfDirective("#endif"); |
| 2506 | |
| 2507 | PPConditionalInfo CondInfo; |
| 2508 | if (CurLexer->popConditionalLevel(CondInfo)) { |
| 2509 | // No conditionals on the stack: this is an #endif without an #if. |
| 2510 | return Diag(EndifToken, diag::err_pp_endif_without_if); |
| 2511 | } |
| 2512 | |
| 2513 | // If this the end of a top-level #endif, inform MIOpt. |
| 2514 | if (CurLexer->getConditionalStackDepth() == 0) |
| 2515 | CurLexer->MIOpt.ExitTopLevelConditional(); |
| 2516 | |
| 2517 | assert(!CondInfo.WasSkipping && !CurLexer->LexingRawMode && |
| 2518 | "This code should only be reachable in the non-skipping case!"); |
| 2519 | } |
| 2520 | |
| 2521 | |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 2522 | void Preprocessor::HandleElseDirective(Token &Result) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2523 | ++NumElse; |
| 2524 | |
| 2525 | // #else directive in a non-skipping conditional... start skipping. |
| 2526 | CheckEndOfDirective("#else"); |
| 2527 | |
| 2528 | PPConditionalInfo CI; |
| 2529 | if (CurLexer->popConditionalLevel(CI)) |
| 2530 | return Diag(Result, diag::pp_err_else_without_if); |
| 2531 | |
| 2532 | // If this is a top-level #else, inform the MIOpt. |
| 2533 | if (CurLexer->getConditionalStackDepth() == 0) |
| 2534 | CurLexer->MIOpt.FoundTopLevelElse(); |
| 2535 | |
| 2536 | // If this is a #else with a #else before it, report the error. |
| 2537 | if (CI.FoundElse) Diag(Result, diag::pp_err_else_after_else); |
| 2538 | |
| 2539 | // Finally, skip the rest of the contents of this block and return the first |
| 2540 | // token after it. |
| 2541 | return SkipExcludedConditionalBlock(CI.IfLoc, /*Foundnonskip*/true, |
| 2542 | /*FoundElse*/true); |
| 2543 | } |
| 2544 | |
Chris Lattner | d217773 | 2007-07-20 16:59:19 +0000 | [diff] [blame] | 2545 | void Preprocessor::HandleElifDirective(Token &ElifToken) { |
Reid Spencer | 5f016e2 | 2007-07-11 17:01:13 +0000 | [diff] [blame] | 2546 | ++NumElse; |
| 2547 | |
| 2548 | // #elif directive in a non-skipping conditional... start skipping. |
| 2549 | // We don't care what the condition is, because we will always skip it (since |
| 2550 | // the block immediately before it was included). |
| 2551 | DiscardUntilEndOfDirective(); |
| 2552 | |
| 2553 | PPConditionalInfo CI; |
| 2554 | if (CurLexer->popConditionalLevel(CI)) |
| 2555 | return Diag(ElifToken, diag::pp_err_elif_without_if); |
| 2556 | |
| 2557 | // If this is a top-level #elif, inform the MIOpt. |
| 2558 | if (CurLexer->getConditionalStackDepth() == 0) |
| 2559 | CurLexer->MIOpt.FoundTopLevelElse(); |
| 2560 | |
| 2561 | // If this is a #elif with a #else before it, report the error. |
| 2562 | if (CI.FoundElse) Diag(ElifToken, diag::pp_err_elif_after_else); |
| 2563 | |
| 2564 | // Finally, skip the rest of the contents of this block and return the first |
| 2565 | // token after it. |
| 2566 | return SkipExcludedConditionalBlock(CI.IfLoc, /*Foundnonskip*/true, |
| 2567 | /*FoundElse*/CI.FoundElse); |
| 2568 | } |
| 2569 | |