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Shih-wei Liaof8fd82b2010-02-10 11:10:31 -08001//===--- Pragma.cpp - Pragma registration and handling --------------------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the PragmaHandler/PragmaTable interfaces and implements
11// pragma related methods of the Preprocessor class.
12//
13//===----------------------------------------------------------------------===//
14
15#include "clang/Lex/Pragma.h"
16#include "clang/Lex/HeaderSearch.h"
17#include "clang/Lex/LiteralSupport.h"
18#include "clang/Lex/Preprocessor.h"
19#include "clang/Lex/LexDiagnostic.h"
20#include "clang/Basic/FileManager.h"
21#include "clang/Basic/SourceManager.h"
22#include <algorithm>
23using namespace clang;
24
25// Out-of-line destructor to provide a home for the class.
26PragmaHandler::~PragmaHandler() {
27}
28
29//===----------------------------------------------------------------------===//
30// PragmaNamespace Implementation.
31//===----------------------------------------------------------------------===//
32
33
34PragmaNamespace::~PragmaNamespace() {
35 for (unsigned i = 0, e = Handlers.size(); i != e; ++i)
36 delete Handlers[i];
37}
38
39/// FindHandler - Check to see if there is already a handler for the
40/// specified name. If not, return the handler for the null identifier if it
41/// exists, otherwise return null. If IgnoreNull is true (the default) then
42/// the null handler isn't returned on failure to match.
43PragmaHandler *PragmaNamespace::FindHandler(const IdentifierInfo *Name,
44 bool IgnoreNull) const {
45 PragmaHandler *NullHandler = 0;
46 for (unsigned i = 0, e = Handlers.size(); i != e; ++i) {
47 if (Handlers[i]->getName() == Name)
48 return Handlers[i];
49
50 if (Handlers[i]->getName() == 0)
51 NullHandler = Handlers[i];
52 }
53 return IgnoreNull ? 0 : NullHandler;
54}
55
56void PragmaNamespace::RemovePragmaHandler(PragmaHandler *Handler) {
57 for (unsigned i = 0, e = Handlers.size(); i != e; ++i) {
58 if (Handlers[i] == Handler) {
59 Handlers[i] = Handlers.back();
60 Handlers.pop_back();
61 return;
62 }
63 }
64 assert(0 && "Handler not registered in this namespace");
65}
66
67void PragmaNamespace::HandlePragma(Preprocessor &PP, Token &Tok) {
68 // Read the 'namespace' that the directive is in, e.g. STDC. Do not macro
69 // expand it, the user can have a STDC #define, that should not affect this.
70 PP.LexUnexpandedToken(Tok);
71
72 // Get the handler for this token. If there is no handler, ignore the pragma.
73 PragmaHandler *Handler = FindHandler(Tok.getIdentifierInfo(), false);
74 if (Handler == 0) {
75 PP.Diag(Tok, diag::warn_pragma_ignored);
76 return;
77 }
78
79 // Otherwise, pass it down.
80 Handler->HandlePragma(PP, Tok);
81}
82
83//===----------------------------------------------------------------------===//
84// Preprocessor Pragma Directive Handling.
85//===----------------------------------------------------------------------===//
86
87/// HandlePragmaDirective - The "#pragma" directive has been parsed. Lex the
88/// rest of the pragma, passing it to the registered pragma handlers.
89void Preprocessor::HandlePragmaDirective() {
90 ++NumPragma;
91
92 // Invoke the first level of pragma handlers which reads the namespace id.
93 Token Tok;
94 PragmaHandlers->HandlePragma(*this, Tok);
95
96 // If the pragma handler didn't read the rest of the line, consume it now.
97 if (CurPPLexer && CurPPLexer->ParsingPreprocessorDirective)
98 DiscardUntilEndOfDirective();
99}
100
101/// Handle_Pragma - Read a _Pragma directive, slice it up, process it, then
102/// return the first token after the directive. The _Pragma token has just
103/// been read into 'Tok'.
104void Preprocessor::Handle_Pragma(Token &Tok) {
105 // Remember the pragma token location.
106 SourceLocation PragmaLoc = Tok.getLocation();
107
108 // Read the '('.
109 Lex(Tok);
110 if (Tok.isNot(tok::l_paren)) {
111 Diag(PragmaLoc, diag::err__Pragma_malformed);
112 return;
113 }
114
115 // Read the '"..."'.
116 Lex(Tok);
117 if (Tok.isNot(tok::string_literal) && Tok.isNot(tok::wide_string_literal)) {
118 Diag(PragmaLoc, diag::err__Pragma_malformed);
119 return;
120 }
121
122 // Remember the string.
123 std::string StrVal = getSpelling(Tok);
124
125 // Read the ')'.
126 Lex(Tok);
127 if (Tok.isNot(tok::r_paren)) {
128 Diag(PragmaLoc, diag::err__Pragma_malformed);
129 return;
130 }
131
132 SourceLocation RParenLoc = Tok.getLocation();
133
134 // The _Pragma is lexically sound. Destringize according to C99 6.10.9.1:
135 // "The string literal is destringized by deleting the L prefix, if present,
136 // deleting the leading and trailing double-quotes, replacing each escape
137 // sequence \" by a double-quote, and replacing each escape sequence \\ by a
138 // single backslash."
139 if (StrVal[0] == 'L') // Remove L prefix.
140 StrVal.erase(StrVal.begin());
141 assert(StrVal[0] == '"' && StrVal[StrVal.size()-1] == '"' &&
142 "Invalid string token!");
143
144 // Remove the front quote, replacing it with a space, so that the pragma
145 // contents appear to have a space before them.
146 StrVal[0] = ' ';
147
148 // Replace the terminating quote with a \n.
149 StrVal[StrVal.size()-1] = '\n';
150
151 // Remove escaped quotes and escapes.
152 for (unsigned i = 0, e = StrVal.size(); i != e-1; ++i) {
153 if (StrVal[i] == '\\' &&
154 (StrVal[i+1] == '\\' || StrVal[i+1] == '"')) {
155 // \\ -> '\' and \" -> '"'.
156 StrVal.erase(StrVal.begin()+i);
157 --e;
158 }
159 }
160
161 // Plop the string (including the newline and trailing null) into a buffer
162 // where we can lex it.
163 Token TmpTok;
164 TmpTok.startToken();
165 CreateString(&StrVal[0], StrVal.size(), TmpTok);
166 SourceLocation TokLoc = TmpTok.getLocation();
167
168 // Make and enter a lexer object so that we lex and expand the tokens just
169 // like any others.
170 Lexer *TL = Lexer::Create_PragmaLexer(TokLoc, PragmaLoc, RParenLoc,
171 StrVal.size(), *this);
172
173 EnterSourceFileWithLexer(TL, 0);
174
175 // With everything set up, lex this as a #pragma directive.
176 HandlePragmaDirective();
177
178 // Finally, return whatever came after the pragma directive.
179 return Lex(Tok);
180}
181
182
183
184/// HandlePragmaOnce - Handle #pragma once. OnceTok is the 'once'.
185///
186void Preprocessor::HandlePragmaOnce(Token &OnceTok) {
187 if (isInPrimaryFile()) {
188 Diag(OnceTok, diag::pp_pragma_once_in_main_file);
189 return;
190 }
191
192 // Get the current file lexer we're looking at. Ignore _Pragma 'files' etc.
193 // Mark the file as a once-only file now.
194 HeaderInfo.MarkFileIncludeOnce(getCurrentFileLexer()->getFileEntry());
195}
196
197void Preprocessor::HandlePragmaMark() {
198 assert(CurPPLexer && "No current lexer?");
199 if (CurLexer)
200 CurLexer->ReadToEndOfLine();
201 else
202 CurPTHLexer->DiscardToEndOfLine();
203}
204
205
206/// HandlePragmaPoison - Handle #pragma GCC poison. PoisonTok is the 'poison'.
207///
208void Preprocessor::HandlePragmaPoison(Token &PoisonTok) {
209 Token Tok;
210
211 while (1) {
212 // Read the next token to poison. While doing this, pretend that we are
213 // skipping while reading the identifier to poison.
214 // This avoids errors on code like:
215 // #pragma GCC poison X
216 // #pragma GCC poison X
217 if (CurPPLexer) CurPPLexer->LexingRawMode = true;
218 LexUnexpandedToken(Tok);
219 if (CurPPLexer) CurPPLexer->LexingRawMode = false;
220
221 // If we reached the end of line, we're done.
222 if (Tok.is(tok::eom)) return;
223
224 // Can only poison identifiers.
225 if (Tok.isNot(tok::identifier)) {
226 Diag(Tok, diag::err_pp_invalid_poison);
227 return;
228 }
229
230 // Look up the identifier info for the token. We disabled identifier lookup
231 // by saying we're skipping contents, so we need to do this manually.
232 IdentifierInfo *II = LookUpIdentifierInfo(Tok);
233
234 // Already poisoned.
235 if (II->isPoisoned()) continue;
236
237 // If this is a macro identifier, emit a warning.
238 if (II->hasMacroDefinition())
239 Diag(Tok, diag::pp_poisoning_existing_macro);
240
241 // Finally, poison it!
242 II->setIsPoisoned();
243 }
244}
245
246/// HandlePragmaSystemHeader - Implement #pragma GCC system_header. We know
247/// that the whole directive has been parsed.
248void Preprocessor::HandlePragmaSystemHeader(Token &SysHeaderTok) {
249 if (isInPrimaryFile()) {
250 Diag(SysHeaderTok, diag::pp_pragma_sysheader_in_main_file);
251 return;
252 }
253
254 // Get the current file lexer we're looking at. Ignore _Pragma 'files' etc.
255 PreprocessorLexer *TheLexer = getCurrentFileLexer();
256
257 // Mark the file as a system header.
258 HeaderInfo.MarkFileSystemHeader(TheLexer->getFileEntry());
259
260
261 PresumedLoc PLoc = SourceMgr.getPresumedLoc(SysHeaderTok.getLocation());
262 unsigned FilenameLen = strlen(PLoc.getFilename());
263 unsigned FilenameID = SourceMgr.getLineTableFilenameID(PLoc.getFilename(),
264 FilenameLen);
265
266 // Emit a line marker. This will change any source locations from this point
267 // forward to realize they are in a system header.
268 // Create a line note with this information.
269 SourceMgr.AddLineNote(SysHeaderTok.getLocation(), PLoc.getLine(), FilenameID,
270 false, false, true, false);
271
272 // Notify the client, if desired, that we are in a new source file.
273 if (Callbacks)
274 Callbacks->FileChanged(SysHeaderTok.getLocation(),
275 PPCallbacks::SystemHeaderPragma, SrcMgr::C_System);
276}
277
278/// HandlePragmaDependency - Handle #pragma GCC dependency "foo" blah.
279///
280void Preprocessor::HandlePragmaDependency(Token &DependencyTok) {
281 Token FilenameTok;
282 CurPPLexer->LexIncludeFilename(FilenameTok);
283
284 // If the token kind is EOM, the error has already been diagnosed.
285 if (FilenameTok.is(tok::eom))
286 return;
287
288 // Reserve a buffer to get the spelling.
289 llvm::SmallString<128> FilenameBuffer;
290 FilenameBuffer.resize(FilenameTok.getLength());
291
292 const char *FilenameStart = &FilenameBuffer[0];
293 unsigned Len = getSpelling(FilenameTok, FilenameStart);
294 llvm::StringRef Filename(FilenameStart, Len);
295 bool isAngled =
296 GetIncludeFilenameSpelling(FilenameTok.getLocation(), Filename);
297 // If GetIncludeFilenameSpelling set the start ptr to null, there was an
298 // error.
299 if (Filename.empty())
300 return;
301
302 // Search include directories for this file.
303 const DirectoryLookup *CurDir;
304 const FileEntry *File = LookupFile(Filename, isAngled, 0, CurDir);
305 if (File == 0) {
306 Diag(FilenameTok, diag::err_pp_file_not_found) << Filename;
307 return;
308 }
309
310 const FileEntry *CurFile = getCurrentFileLexer()->getFileEntry();
311
312 // If this file is older than the file it depends on, emit a diagnostic.
313 if (CurFile && CurFile->getModificationTime() < File->getModificationTime()) {
314 // Lex tokens at the end of the message and include them in the message.
315 std::string Message;
316 Lex(DependencyTok);
317 while (DependencyTok.isNot(tok::eom)) {
318 Message += getSpelling(DependencyTok) + " ";
319 Lex(DependencyTok);
320 }
321
322 Message.erase(Message.end()-1);
323 Diag(FilenameTok, diag::pp_out_of_date_dependency) << Message;
324 }
325}
326
327/// HandlePragmaComment - Handle the microsoft #pragma comment extension. The
328/// syntax is:
329/// #pragma comment(linker, "foo")
330/// 'linker' is one of five identifiers: compiler, exestr, lib, linker, user.
331/// "foo" is a string, which is fully macro expanded, and permits string
332/// concatenation, embedded escape characters etc. See MSDN for more details.
333void Preprocessor::HandlePragmaComment(Token &Tok) {
334 SourceLocation CommentLoc = Tok.getLocation();
335 Lex(Tok);
336 if (Tok.isNot(tok::l_paren)) {
337 Diag(CommentLoc, diag::err_pragma_comment_malformed);
338 return;
339 }
340
341 // Read the identifier.
342 Lex(Tok);
343 if (Tok.isNot(tok::identifier)) {
344 Diag(CommentLoc, diag::err_pragma_comment_malformed);
345 return;
346 }
347
348 // Verify that this is one of the 5 whitelisted options.
349 // FIXME: warn that 'exestr' is deprecated.
350 const IdentifierInfo *II = Tok.getIdentifierInfo();
351 if (!II->isStr("compiler") && !II->isStr("exestr") && !II->isStr("lib") &&
352 !II->isStr("linker") && !II->isStr("user")) {
353 Diag(Tok.getLocation(), diag::err_pragma_comment_unknown_kind);
354 return;
355 }
356
357 // Read the optional string if present.
358 Lex(Tok);
359 std::string ArgumentString;
360 if (Tok.is(tok::comma)) {
361 Lex(Tok); // eat the comma.
362
363 // We need at least one string.
364 if (Tok.isNot(tok::string_literal)) {
365 Diag(Tok.getLocation(), diag::err_pragma_comment_malformed);
366 return;
367 }
368
369 // String concatenation allows multiple strings, which can even come from
370 // macro expansion.
371 // "foo " "bar" "Baz"
372 llvm::SmallVector<Token, 4> StrToks;
373 while (Tok.is(tok::string_literal)) {
374 StrToks.push_back(Tok);
375 Lex(Tok);
376 }
377
378 // Concatenate and parse the strings.
379 StringLiteralParser Literal(&StrToks[0], StrToks.size(), *this);
380 assert(!Literal.AnyWide && "Didn't allow wide strings in");
381 if (Literal.hadError)
382 return;
383 if (Literal.Pascal) {
384 Diag(StrToks[0].getLocation(), diag::err_pragma_comment_malformed);
385 return;
386 }
387
388 ArgumentString = std::string(Literal.GetString(),
389 Literal.GetString()+Literal.GetStringLength());
390 }
391
392 // FIXME: If the kind is "compiler" warn if the string is present (it is
393 // ignored).
394 // FIXME: 'lib' requires a comment string.
395 // FIXME: 'linker' requires a comment string, and has a specific list of
396 // things that are allowable.
397
398 if (Tok.isNot(tok::r_paren)) {
399 Diag(Tok.getLocation(), diag::err_pragma_comment_malformed);
400 return;
401 }
402 Lex(Tok); // eat the r_paren.
403
404 if (Tok.isNot(tok::eom)) {
405 Diag(Tok.getLocation(), diag::err_pragma_comment_malformed);
406 return;
407 }
408
409 // If the pragma is lexically sound, notify any interested PPCallbacks.
410 if (Callbacks)
411 Callbacks->PragmaComment(CommentLoc, II, ArgumentString);
412}
413
414
415
416
417/// AddPragmaHandler - Add the specified pragma handler to the preprocessor.
418/// If 'Namespace' is non-null, then it is a token required to exist on the
419/// pragma line before the pragma string starts, e.g. "STDC" or "GCC".
420void Preprocessor::AddPragmaHandler(const char *Namespace,
421 PragmaHandler *Handler) {
422 PragmaNamespace *InsertNS = PragmaHandlers;
423
424 // If this is specified to be in a namespace, step down into it.
425 if (Namespace) {
426 IdentifierInfo *NSID = getIdentifierInfo(Namespace);
427
428 // If there is already a pragma handler with the name of this namespace,
429 // we either have an error (directive with the same name as a namespace) or
430 // we already have the namespace to insert into.
431 if (PragmaHandler *Existing = PragmaHandlers->FindHandler(NSID)) {
432 InsertNS = Existing->getIfNamespace();
433 assert(InsertNS != 0 && "Cannot have a pragma namespace and pragma"
434 " handler with the same name!");
435 } else {
436 // Otherwise, this namespace doesn't exist yet, create and insert the
437 // handler for it.
438 InsertNS = new PragmaNamespace(NSID);
439 PragmaHandlers->AddPragma(InsertNS);
440 }
441 }
442
443 // Check to make sure we don't already have a pragma for this identifier.
444 assert(!InsertNS->FindHandler(Handler->getName()) &&
445 "Pragma handler already exists for this identifier!");
446 InsertNS->AddPragma(Handler);
447}
448
449/// RemovePragmaHandler - Remove the specific pragma handler from the
450/// preprocessor. If \arg Namespace is non-null, then it should be the
451/// namespace that \arg Handler was added to. It is an error to remove
452/// a handler that has not been registered.
453void Preprocessor::RemovePragmaHandler(const char *Namespace,
454 PragmaHandler *Handler) {
455 PragmaNamespace *NS = PragmaHandlers;
456
457 // If this is specified to be in a namespace, step down into it.
458 if (Namespace) {
459 IdentifierInfo *NSID = getIdentifierInfo(Namespace);
460 PragmaHandler *Existing = PragmaHandlers->FindHandler(NSID);
461 assert(Existing && "Namespace containing handler does not exist!");
462
463 NS = Existing->getIfNamespace();
464 assert(NS && "Invalid namespace, registered as a regular pragma handler!");
465 }
466
467 NS->RemovePragmaHandler(Handler);
468
469 // If this is a non-default namespace and it is now empty, remove
470 // it.
471 if (NS != PragmaHandlers && NS->IsEmpty())
472 PragmaHandlers->RemovePragmaHandler(NS);
473}
474
475namespace {
476/// PragmaOnceHandler - "#pragma once" marks the file as atomically included.
477struct PragmaOnceHandler : public PragmaHandler {
478 PragmaOnceHandler(const IdentifierInfo *OnceID) : PragmaHandler(OnceID) {}
479 virtual void HandlePragma(Preprocessor &PP, Token &OnceTok) {
480 PP.CheckEndOfDirective("pragma once");
481 PP.HandlePragmaOnce(OnceTok);
482 }
483};
484
485/// PragmaMarkHandler - "#pragma mark ..." is ignored by the compiler, and the
486/// rest of the line is not lexed.
487struct PragmaMarkHandler : public PragmaHandler {
488 PragmaMarkHandler(const IdentifierInfo *MarkID) : PragmaHandler(MarkID) {}
489 virtual void HandlePragma(Preprocessor &PP, Token &MarkTok) {
490 PP.HandlePragmaMark();
491 }
492};
493
494/// PragmaPoisonHandler - "#pragma poison x" marks x as not usable.
495struct PragmaPoisonHandler : public PragmaHandler {
496 PragmaPoisonHandler(const IdentifierInfo *ID) : PragmaHandler(ID) {}
497 virtual void HandlePragma(Preprocessor &PP, Token &PoisonTok) {
498 PP.HandlePragmaPoison(PoisonTok);
499 }
500};
501
502/// PragmaSystemHeaderHandler - "#pragma system_header" marks the current file
503/// as a system header, which silences warnings in it.
504struct PragmaSystemHeaderHandler : public PragmaHandler {
505 PragmaSystemHeaderHandler(const IdentifierInfo *ID) : PragmaHandler(ID) {}
506 virtual void HandlePragma(Preprocessor &PP, Token &SHToken) {
507 PP.HandlePragmaSystemHeader(SHToken);
508 PP.CheckEndOfDirective("pragma");
509 }
510};
511struct PragmaDependencyHandler : public PragmaHandler {
512 PragmaDependencyHandler(const IdentifierInfo *ID) : PragmaHandler(ID) {}
513 virtual void HandlePragma(Preprocessor &PP, Token &DepToken) {
514 PP.HandlePragmaDependency(DepToken);
515 }
516};
517
518/// PragmaDiagnosticHandler - e.g. '#pragma GCC diagnostic ignored "-Wformat"'
519/// Since clang's diagnostic supports extended functionality beyond GCC's
520/// the constructor takes a clangMode flag to tell it whether or not to allow
521/// clang's extended functionality, or whether to reject it.
522struct PragmaDiagnosticHandler : public PragmaHandler {
523private:
524 const bool ClangMode;
525public:
526 PragmaDiagnosticHandler(const IdentifierInfo *ID,
527 const bool clangMode) : PragmaHandler(ID),
528 ClangMode(clangMode) {}
529 virtual void HandlePragma(Preprocessor &PP, Token &DiagToken) {
530 Token Tok;
531 PP.LexUnexpandedToken(Tok);
532 if (Tok.isNot(tok::identifier)) {
533 unsigned Diag = ClangMode ? diag::warn_pragma_diagnostic_clang_invalid
534 : diag::warn_pragma_diagnostic_gcc_invalid;
535 PP.Diag(Tok, Diag);
536 return;
537 }
538 IdentifierInfo *II = Tok.getIdentifierInfo();
539
540 diag::Mapping Map;
541 if (II->isStr("warning"))
542 Map = diag::MAP_WARNING;
543 else if (II->isStr("error"))
544 Map = diag::MAP_ERROR;
545 else if (II->isStr("ignored"))
546 Map = diag::MAP_IGNORE;
547 else if (II->isStr("fatal"))
548 Map = diag::MAP_FATAL;
549 else if (ClangMode) {
550 if (II->isStr("pop")) {
551 if (!PP.getDiagnostics().popMappings())
552 PP.Diag(Tok, diag::warn_pragma_diagnostic_clang_cannot_ppp);
553 return;
554 }
555
556 if (II->isStr("push")) {
557 PP.getDiagnostics().pushMappings();
558 return;
559 }
560
561 PP.Diag(Tok, diag::warn_pragma_diagnostic_clang_invalid);
562 return;
563 } else {
564 PP.Diag(Tok, diag::warn_pragma_diagnostic_gcc_invalid);
565 return;
566 }
567
568 PP.LexUnexpandedToken(Tok);
569
570 // We need at least one string.
571 if (Tok.isNot(tok::string_literal)) {
572 PP.Diag(Tok.getLocation(), diag::warn_pragma_diagnostic_invalid_token);
573 return;
574 }
575
576 // String concatenation allows multiple strings, which can even come from
577 // macro expansion.
578 // "foo " "bar" "Baz"
579 llvm::SmallVector<Token, 4> StrToks;
580 while (Tok.is(tok::string_literal)) {
581 StrToks.push_back(Tok);
582 PP.LexUnexpandedToken(Tok);
583 }
584
585 if (Tok.isNot(tok::eom)) {
586 PP.Diag(Tok.getLocation(), diag::warn_pragma_diagnostic_invalid_token);
587 return;
588 }
589
590 // Concatenate and parse the strings.
591 StringLiteralParser Literal(&StrToks[0], StrToks.size(), PP);
592 assert(!Literal.AnyWide && "Didn't allow wide strings in");
593 if (Literal.hadError)
594 return;
595 if (Literal.Pascal) {
596 unsigned Diag = ClangMode ? diag::warn_pragma_diagnostic_clang_invalid
597 : diag::warn_pragma_diagnostic_gcc_invalid;
598 PP.Diag(Tok, Diag);
599 return;
600 }
601
602 std::string WarningName(Literal.GetString(),
603 Literal.GetString()+Literal.GetStringLength());
604
605 if (WarningName.size() < 3 || WarningName[0] != '-' ||
606 WarningName[1] != 'W') {
607 PP.Diag(StrToks[0].getLocation(),
608 diag::warn_pragma_diagnostic_invalid_option);
609 return;
610 }
611
612 if (PP.getDiagnostics().setDiagnosticGroupMapping(WarningName.c_str()+2,
613 Map))
614 PP.Diag(StrToks[0].getLocation(),
615 diag::warn_pragma_diagnostic_unknown_warning) << WarningName;
616 }
617};
618
619/// PragmaCommentHandler - "#pragma comment ...".
620struct PragmaCommentHandler : public PragmaHandler {
621 PragmaCommentHandler(const IdentifierInfo *ID) : PragmaHandler(ID) {}
622 virtual void HandlePragma(Preprocessor &PP, Token &CommentTok) {
623 PP.HandlePragmaComment(CommentTok);
624 }
625};
626
627// Pragma STDC implementations.
628
629enum STDCSetting {
630 STDC_ON, STDC_OFF, STDC_DEFAULT, STDC_INVALID
631};
632
633static STDCSetting LexOnOffSwitch(Preprocessor &PP) {
634 Token Tok;
635 PP.LexUnexpandedToken(Tok);
636
637 if (Tok.isNot(tok::identifier)) {
638 PP.Diag(Tok, diag::ext_stdc_pragma_syntax);
639 return STDC_INVALID;
640 }
641 IdentifierInfo *II = Tok.getIdentifierInfo();
642 STDCSetting Result;
643 if (II->isStr("ON"))
644 Result = STDC_ON;
645 else if (II->isStr("OFF"))
646 Result = STDC_OFF;
647 else if (II->isStr("DEFAULT"))
648 Result = STDC_DEFAULT;
649 else {
650 PP.Diag(Tok, diag::ext_stdc_pragma_syntax);
651 return STDC_INVALID;
652 }
653
654 // Verify that this is followed by EOM.
655 PP.LexUnexpandedToken(Tok);
656 if (Tok.isNot(tok::eom))
657 PP.Diag(Tok, diag::ext_stdc_pragma_syntax_eom);
658 return Result;
659}
660
661/// PragmaSTDC_FP_CONTRACTHandler - "#pragma STDC FP_CONTRACT ...".
662struct PragmaSTDC_FP_CONTRACTHandler : public PragmaHandler {
663 PragmaSTDC_FP_CONTRACTHandler(const IdentifierInfo *ID) : PragmaHandler(ID) {}
664 virtual void HandlePragma(Preprocessor &PP, Token &Tok) {
665 // We just ignore the setting of FP_CONTRACT. Since we don't do contractions
666 // at all, our default is OFF and setting it to ON is an optimization hint
667 // we can safely ignore. When we support -ffma or something, we would need
668 // to diagnose that we are ignoring FMA.
669 LexOnOffSwitch(PP);
670 }
671};
672
673/// PragmaSTDC_FENV_ACCESSHandler - "#pragma STDC FENV_ACCESS ...".
674struct PragmaSTDC_FENV_ACCESSHandler : public PragmaHandler {
675 PragmaSTDC_FENV_ACCESSHandler(const IdentifierInfo *ID) : PragmaHandler(ID) {}
676 virtual void HandlePragma(Preprocessor &PP, Token &Tok) {
677 if (LexOnOffSwitch(PP) == STDC_ON)
678 PP.Diag(Tok, diag::warn_stdc_fenv_access_not_supported);
679 }
680};
681
682/// PragmaSTDC_CX_LIMITED_RANGEHandler - "#pragma STDC CX_LIMITED_RANGE ...".
683struct PragmaSTDC_CX_LIMITED_RANGEHandler : public PragmaHandler {
684 PragmaSTDC_CX_LIMITED_RANGEHandler(const IdentifierInfo *ID)
685 : PragmaHandler(ID) {}
686 virtual void HandlePragma(Preprocessor &PP, Token &Tok) {
687 LexOnOffSwitch(PP);
688 }
689};
690
691/// PragmaSTDC_UnknownHandler - "#pragma STDC ...".
692struct PragmaSTDC_UnknownHandler : public PragmaHandler {
693 PragmaSTDC_UnknownHandler() : PragmaHandler(0) {}
694 virtual void HandlePragma(Preprocessor &PP, Token &UnknownTok) {
695 // C99 6.10.6p2, unknown forms are not allowed.
696 PP.Diag(UnknownTok, diag::ext_stdc_pragma_ignored);
697 }
698};
699
700} // end anonymous namespace
701
702
703/// RegisterBuiltinPragmas - Install the standard preprocessor pragmas:
704/// #pragma GCC poison/system_header/dependency and #pragma once.
705void Preprocessor::RegisterBuiltinPragmas() {
706 AddPragmaHandler(0, new PragmaOnceHandler(getIdentifierInfo("once")));
707 AddPragmaHandler(0, new PragmaMarkHandler(getIdentifierInfo("mark")));
708
709 // #pragma GCC ...
710 AddPragmaHandler("GCC", new PragmaPoisonHandler(getIdentifierInfo("poison")));
711 AddPragmaHandler("GCC", new PragmaSystemHeaderHandler(
712 getIdentifierInfo("system_header")));
713 AddPragmaHandler("GCC", new PragmaDependencyHandler(
714 getIdentifierInfo("dependency")));
715 AddPragmaHandler("GCC", new PragmaDiagnosticHandler(
716 getIdentifierInfo("diagnostic"),
717 false));
718 // #pragma clang ...
719 AddPragmaHandler("clang", new PragmaPoisonHandler(
720 getIdentifierInfo("poison")));
721 AddPragmaHandler("clang", new PragmaSystemHeaderHandler(
722 getIdentifierInfo("system_header")));
723 AddPragmaHandler("clang", new PragmaDependencyHandler(
724 getIdentifierInfo("dependency")));
725 AddPragmaHandler("clang", new PragmaDiagnosticHandler(
726 getIdentifierInfo("diagnostic"),
727 true));
728
729 AddPragmaHandler("STDC", new PragmaSTDC_FP_CONTRACTHandler(
730 getIdentifierInfo("FP_CONTRACT")));
731 AddPragmaHandler("STDC", new PragmaSTDC_FENV_ACCESSHandler(
732 getIdentifierInfo("FENV_ACCESS")));
733 AddPragmaHandler("STDC", new PragmaSTDC_CX_LIMITED_RANGEHandler(
734 getIdentifierInfo("CX_LIMITED_RANGE")));
735 AddPragmaHandler("STDC", new PragmaSTDC_UnknownHandler());
736
737 // MS extensions.
738 if (Features.Microsoft)
739 AddPragmaHandler(0, new PragmaCommentHandler(getIdentifierInfo("comment")));
740}