| //===--- Pragma.cpp - Pragma registration and handling --------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the PragmaHandler/PragmaTable interfaces and implements |
| // pragma related methods of the Preprocessor class. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "clang/Lex/Pragma.h" |
| #include "clang/Lex/HeaderSearch.h" |
| #include "clang/Lex/LiteralSupport.h" |
| #include "clang/Lex/Preprocessor.h" |
| #include "clang/Lex/LexDiagnostic.h" |
| #include "clang/Basic/FileManager.h" |
| #include "clang/Basic/SourceManager.h" |
| #include <algorithm> |
| using namespace clang; |
| |
| // Out-of-line destructor to provide a home for the class. |
| PragmaHandler::~PragmaHandler() { |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // EmptyPragmaHandler Implementation. |
| //===----------------------------------------------------------------------===// |
| |
| EmptyPragmaHandler::EmptyPragmaHandler() {} |
| |
| void EmptyPragmaHandler::HandlePragma(Preprocessor &PP, Token &FirstToken) {} |
| |
| //===----------------------------------------------------------------------===// |
| // PragmaNamespace Implementation. |
| //===----------------------------------------------------------------------===// |
| |
| |
| PragmaNamespace::~PragmaNamespace() { |
| for (llvm::StringMap<PragmaHandler*>::iterator |
| I = Handlers.begin(), E = Handlers.end(); I != E; ++I) |
| delete I->second; |
| } |
| |
| /// FindHandler - Check to see if there is already a handler for the |
| /// specified name. If not, return the handler for the null identifier if it |
| /// exists, otherwise return null. If IgnoreNull is true (the default) then |
| /// the null handler isn't returned on failure to match. |
| PragmaHandler *PragmaNamespace::FindHandler(llvm::StringRef Name, |
| bool IgnoreNull) const { |
| if (PragmaHandler *Handler = Handlers.lookup(Name)) |
| return Handler; |
| return IgnoreNull ? 0 : Handlers.lookup(llvm::StringRef()); |
| } |
| |
| void PragmaNamespace::AddPragma(PragmaHandler *Handler) { |
| assert(!Handlers.lookup(Handler->getName()) && |
| "A handler with this name is already registered in this namespace"); |
| llvm::StringMapEntry<PragmaHandler *> &Entry = |
| Handlers.GetOrCreateValue(Handler->getName()); |
| Entry.setValue(Handler); |
| } |
| |
| void PragmaNamespace::RemovePragmaHandler(PragmaHandler *Handler) { |
| assert(Handlers.lookup(Handler->getName()) && |
| "Handler not registered in this namespace"); |
| Handlers.erase(Handler->getName()); |
| } |
| |
| void PragmaNamespace::HandlePragma(Preprocessor &PP, Token &Tok) { |
| // Read the 'namespace' that the directive is in, e.g. STDC. Do not macro |
| // expand it, the user can have a STDC #define, that should not affect this. |
| PP.LexUnexpandedToken(Tok); |
| |
| // Get the handler for this token. If there is no handler, ignore the pragma. |
| PragmaHandler *Handler |
| = FindHandler(Tok.getIdentifierInfo() ? Tok.getIdentifierInfo()->getName() |
| : llvm::StringRef(), |
| /*IgnoreNull=*/false); |
| if (Handler == 0) { |
| PP.Diag(Tok, diag::warn_pragma_ignored); |
| return; |
| } |
| |
| // Otherwise, pass it down. |
| Handler->HandlePragma(PP, Tok); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Preprocessor Pragma Directive Handling. |
| //===----------------------------------------------------------------------===// |
| |
| /// HandlePragmaDirective - The "#pragma" directive has been parsed. Lex the |
| /// rest of the pragma, passing it to the registered pragma handlers. |
| void Preprocessor::HandlePragmaDirective() { |
| ++NumPragma; |
| |
| // Invoke the first level of pragma handlers which reads the namespace id. |
| Token Tok; |
| PragmaHandlers->HandlePragma(*this, Tok); |
| |
| // If the pragma handler didn't read the rest of the line, consume it now. |
| if (CurPPLexer && CurPPLexer->ParsingPreprocessorDirective) |
| DiscardUntilEndOfDirective(); |
| } |
| |
| /// Handle_Pragma - Read a _Pragma directive, slice it up, process it, then |
| /// return the first token after the directive. The _Pragma token has just |
| /// been read into 'Tok'. |
| void Preprocessor::Handle_Pragma(Token &Tok) { |
| // Remember the pragma token location. |
| SourceLocation PragmaLoc = Tok.getLocation(); |
| |
| // Read the '('. |
| Lex(Tok); |
| if (Tok.isNot(tok::l_paren)) { |
| Diag(PragmaLoc, diag::err__Pragma_malformed); |
| return; |
| } |
| |
| // Read the '"..."'. |
| Lex(Tok); |
| if (Tok.isNot(tok::string_literal) && Tok.isNot(tok::wide_string_literal)) { |
| Diag(PragmaLoc, diag::err__Pragma_malformed); |
| return; |
| } |
| |
| // Remember the string. |
| std::string StrVal = getSpelling(Tok); |
| |
| // Read the ')'. |
| Lex(Tok); |
| if (Tok.isNot(tok::r_paren)) { |
| Diag(PragmaLoc, diag::err__Pragma_malformed); |
| return; |
| } |
| |
| SourceLocation RParenLoc = Tok.getLocation(); |
| |
| // The _Pragma is lexically sound. Destringize according to C99 6.10.9.1: |
| // "The string literal is destringized by deleting the L prefix, if present, |
| // deleting the leading and trailing double-quotes, replacing each escape |
| // sequence \" by a double-quote, and replacing each escape sequence \\ by a |
| // single backslash." |
| if (StrVal[0] == 'L') // Remove L prefix. |
| StrVal.erase(StrVal.begin()); |
| assert(StrVal[0] == '"' && StrVal[StrVal.size()-1] == '"' && |
| "Invalid string token!"); |
| |
| // Remove the front quote, replacing it with a space, so that the pragma |
| // contents appear to have a space before them. |
| StrVal[0] = ' '; |
| |
| // Replace the terminating quote with a \n. |
| StrVal[StrVal.size()-1] = '\n'; |
| |
| // Remove escaped quotes and escapes. |
| for (unsigned i = 0, e = StrVal.size(); i != e-1; ++i) { |
| if (StrVal[i] == '\\' && |
| (StrVal[i+1] == '\\' || StrVal[i+1] == '"')) { |
| // \\ -> '\' and \" -> '"'. |
| StrVal.erase(StrVal.begin()+i); |
| --e; |
| } |
| } |
| |
| // Plop the string (including the newline and trailing null) into a buffer |
| // where we can lex it. |
| Token TmpTok; |
| TmpTok.startToken(); |
| CreateString(&StrVal[0], StrVal.size(), TmpTok); |
| SourceLocation TokLoc = TmpTok.getLocation(); |
| |
| // Make and enter a lexer object so that we lex and expand the tokens just |
| // like any others. |
| Lexer *TL = Lexer::Create_PragmaLexer(TokLoc, PragmaLoc, RParenLoc, |
| StrVal.size(), *this); |
| |
| EnterSourceFileWithLexer(TL, 0); |
| |
| // With everything set up, lex this as a #pragma directive. |
| HandlePragmaDirective(); |
| |
| // Finally, return whatever came after the pragma directive. |
| return Lex(Tok); |
| } |
| |
| |
| |
| /// HandlePragmaOnce - Handle #pragma once. OnceTok is the 'once'. |
| /// |
| void Preprocessor::HandlePragmaOnce(Token &OnceTok) { |
| if (isInPrimaryFile()) { |
| Diag(OnceTok, diag::pp_pragma_once_in_main_file); |
| return; |
| } |
| |
| // Get the current file lexer we're looking at. Ignore _Pragma 'files' etc. |
| // Mark the file as a once-only file now. |
| HeaderInfo.MarkFileIncludeOnce(getCurrentFileLexer()->getFileEntry()); |
| } |
| |
| void Preprocessor::HandlePragmaMark() { |
| assert(CurPPLexer && "No current lexer?"); |
| if (CurLexer) |
| CurLexer->ReadToEndOfLine(); |
| else |
| CurPTHLexer->DiscardToEndOfLine(); |
| } |
| |
| |
| /// HandlePragmaPoison - Handle #pragma GCC poison. PoisonTok is the 'poison'. |
| /// |
| void Preprocessor::HandlePragmaPoison(Token &PoisonTok) { |
| Token Tok; |
| |
| while (1) { |
| // Read the next token to poison. While doing this, pretend that we are |
| // skipping while reading the identifier to poison. |
| // This avoids errors on code like: |
| // #pragma GCC poison X |
| // #pragma GCC poison X |
| if (CurPPLexer) CurPPLexer->LexingRawMode = true; |
| LexUnexpandedToken(Tok); |
| if (CurPPLexer) CurPPLexer->LexingRawMode = false; |
| |
| // If we reached the end of line, we're done. |
| if (Tok.is(tok::eom)) return; |
| |
| // Can only poison identifiers. |
| if (Tok.isNot(tok::identifier)) { |
| Diag(Tok, diag::err_pp_invalid_poison); |
| return; |
| } |
| |
| // Look up the identifier info for the token. We disabled identifier lookup |
| // by saying we're skipping contents, so we need to do this manually. |
| IdentifierInfo *II = LookUpIdentifierInfo(Tok); |
| |
| // Already poisoned. |
| if (II->isPoisoned()) continue; |
| |
| // If this is a macro identifier, emit a warning. |
| if (II->hasMacroDefinition()) |
| Diag(Tok, diag::pp_poisoning_existing_macro); |
| |
| // Finally, poison it! |
| II->setIsPoisoned(); |
| } |
| } |
| |
| /// HandlePragmaSystemHeader - Implement #pragma GCC system_header. We know |
| /// that the whole directive has been parsed. |
| void Preprocessor::HandlePragmaSystemHeader(Token &SysHeaderTok) { |
| if (isInPrimaryFile()) { |
| Diag(SysHeaderTok, diag::pp_pragma_sysheader_in_main_file); |
| return; |
| } |
| |
| // Get the current file lexer we're looking at. Ignore _Pragma 'files' etc. |
| PreprocessorLexer *TheLexer = getCurrentFileLexer(); |
| |
| // Mark the file as a system header. |
| HeaderInfo.MarkFileSystemHeader(TheLexer->getFileEntry()); |
| |
| |
| PresumedLoc PLoc = SourceMgr.getPresumedLoc(SysHeaderTok.getLocation()); |
| unsigned FilenameLen = strlen(PLoc.getFilename()); |
| unsigned FilenameID = SourceMgr.getLineTableFilenameID(PLoc.getFilename(), |
| FilenameLen); |
| |
| // Emit a line marker. This will change any source locations from this point |
| // forward to realize they are in a system header. |
| // Create a line note with this information. |
| SourceMgr.AddLineNote(SysHeaderTok.getLocation(), PLoc.getLine(), FilenameID, |
| false, false, true, false); |
| |
| // Notify the client, if desired, that we are in a new source file. |
| if (Callbacks) |
| Callbacks->FileChanged(SysHeaderTok.getLocation(), |
| PPCallbacks::SystemHeaderPragma, SrcMgr::C_System); |
| } |
| |
| /// HandlePragmaDependency - Handle #pragma GCC dependency "foo" blah. |
| /// |
| void Preprocessor::HandlePragmaDependency(Token &DependencyTok) { |
| Token FilenameTok; |
| CurPPLexer->LexIncludeFilename(FilenameTok); |
| |
| // If the token kind is EOM, the error has already been diagnosed. |
| if (FilenameTok.is(tok::eom)) |
| return; |
| |
| // Reserve a buffer to get the spelling. |
| llvm::SmallString<128> FilenameBuffer; |
| bool Invalid = false; |
| llvm::StringRef Filename = getSpelling(FilenameTok, FilenameBuffer, &Invalid); |
| if (Invalid) |
| return; |
| |
| bool isAngled = |
| GetIncludeFilenameSpelling(FilenameTok.getLocation(), Filename); |
| // If GetIncludeFilenameSpelling set the start ptr to null, there was an |
| // error. |
| if (Filename.empty()) |
| return; |
| |
| // Search include directories for this file. |
| const DirectoryLookup *CurDir; |
| const FileEntry *File = LookupFile(Filename, isAngled, 0, CurDir); |
| if (File == 0) { |
| Diag(FilenameTok, diag::err_pp_file_not_found) << Filename; |
| return; |
| } |
| |
| const FileEntry *CurFile = getCurrentFileLexer()->getFileEntry(); |
| |
| // If this file is older than the file it depends on, emit a diagnostic. |
| if (CurFile && CurFile->getModificationTime() < File->getModificationTime()) { |
| // Lex tokens at the end of the message and include them in the message. |
| std::string Message; |
| Lex(DependencyTok); |
| while (DependencyTok.isNot(tok::eom)) { |
| Message += getSpelling(DependencyTok) + " "; |
| Lex(DependencyTok); |
| } |
| |
| Message.erase(Message.end()-1); |
| Diag(FilenameTok, diag::pp_out_of_date_dependency) << Message; |
| } |
| } |
| |
| /// HandlePragmaComment - Handle the microsoft #pragma comment extension. The |
| /// syntax is: |
| /// #pragma comment(linker, "foo") |
| /// 'linker' is one of five identifiers: compiler, exestr, lib, linker, user. |
| /// "foo" is a string, which is fully macro expanded, and permits string |
| /// concatenation, embedded escape characters etc. See MSDN for more details. |
| void Preprocessor::HandlePragmaComment(Token &Tok) { |
| SourceLocation CommentLoc = Tok.getLocation(); |
| Lex(Tok); |
| if (Tok.isNot(tok::l_paren)) { |
| Diag(CommentLoc, diag::err_pragma_comment_malformed); |
| return; |
| } |
| |
| // Read the identifier. |
| Lex(Tok); |
| if (Tok.isNot(tok::identifier)) { |
| Diag(CommentLoc, diag::err_pragma_comment_malformed); |
| return; |
| } |
| |
| // Verify that this is one of the 5 whitelisted options. |
| // FIXME: warn that 'exestr' is deprecated. |
| const IdentifierInfo *II = Tok.getIdentifierInfo(); |
| if (!II->isStr("compiler") && !II->isStr("exestr") && !II->isStr("lib") && |
| !II->isStr("linker") && !II->isStr("user")) { |
| Diag(Tok.getLocation(), diag::err_pragma_comment_unknown_kind); |
| return; |
| } |
| |
| // Read the optional string if present. |
| Lex(Tok); |
| std::string ArgumentString; |
| if (Tok.is(tok::comma)) { |
| Lex(Tok); // eat the comma. |
| |
| // We need at least one string. |
| if (Tok.isNot(tok::string_literal)) { |
| Diag(Tok.getLocation(), diag::err_pragma_comment_malformed); |
| return; |
| } |
| |
| // String concatenation allows multiple strings, which can even come from |
| // macro expansion. |
| // "foo " "bar" "Baz" |
| llvm::SmallVector<Token, 4> StrToks; |
| while (Tok.is(tok::string_literal)) { |
| StrToks.push_back(Tok); |
| Lex(Tok); |
| } |
| |
| // Concatenate and parse the strings. |
| StringLiteralParser Literal(&StrToks[0], StrToks.size(), *this); |
| assert(!Literal.AnyWide && "Didn't allow wide strings in"); |
| if (Literal.hadError) |
| return; |
| if (Literal.Pascal) { |
| Diag(StrToks[0].getLocation(), diag::err_pragma_comment_malformed); |
| return; |
| } |
| |
| ArgumentString = std::string(Literal.GetString(), |
| Literal.GetString()+Literal.GetStringLength()); |
| } |
| |
| // FIXME: If the kind is "compiler" warn if the string is present (it is |
| // ignored). |
| // FIXME: 'lib' requires a comment string. |
| // FIXME: 'linker' requires a comment string, and has a specific list of |
| // things that are allowable. |
| |
| if (Tok.isNot(tok::r_paren)) { |
| Diag(Tok.getLocation(), diag::err_pragma_comment_malformed); |
| return; |
| } |
| Lex(Tok); // eat the r_paren. |
| |
| if (Tok.isNot(tok::eom)) { |
| Diag(Tok.getLocation(), diag::err_pragma_comment_malformed); |
| return; |
| } |
| |
| // If the pragma is lexically sound, notify any interested PPCallbacks. |
| if (Callbacks) |
| Callbacks->PragmaComment(CommentLoc, II, ArgumentString); |
| } |
| |
| /// HandlePragmaMessage - Handle the microsoft #pragma message extension. The |
| /// syntax is: |
| /// #pragma message(messagestring) |
| /// messagestring is a string, which is fully macro expanded, and permits string |
| /// concatenation, embedded escape characters etc. See MSDN for more details. |
| void Preprocessor::HandlePragmaMessage(Token &Tok) { |
| SourceLocation MessageLoc = Tok.getLocation(); |
| Lex(Tok); |
| if (Tok.isNot(tok::l_paren)) { |
| Diag(MessageLoc, diag::err_pragma_message_malformed); |
| return; |
| } |
| |
| // Read the string. |
| Lex(Tok); |
| |
| |
| // We need at least one string. |
| if (Tok.isNot(tok::string_literal)) { |
| Diag(Tok.getLocation(), diag::err_pragma_message_malformed); |
| return; |
| } |
| |
| // String concatenation allows multiple strings, which can even come from |
| // macro expansion. |
| // "foo " "bar" "Baz" |
| llvm::SmallVector<Token, 4> StrToks; |
| while (Tok.is(tok::string_literal)) { |
| StrToks.push_back(Tok); |
| Lex(Tok); |
| } |
| |
| // Concatenate and parse the strings. |
| StringLiteralParser Literal(&StrToks[0], StrToks.size(), *this); |
| assert(!Literal.AnyWide && "Didn't allow wide strings in"); |
| if (Literal.hadError) |
| return; |
| if (Literal.Pascal) { |
| Diag(StrToks[0].getLocation(), diag::err_pragma_message_malformed); |
| return; |
| } |
| |
| llvm::StringRef MessageString(Literal.GetString(), Literal.GetStringLength()); |
| |
| if (Tok.isNot(tok::r_paren)) { |
| Diag(Tok.getLocation(), diag::err_pragma_message_malformed); |
| return; |
| } |
| Lex(Tok); // eat the r_paren. |
| |
| if (Tok.isNot(tok::eom)) { |
| Diag(Tok.getLocation(), diag::err_pragma_message_malformed); |
| return; |
| } |
| |
| // Output the message. |
| Diag(MessageLoc, diag::warn_pragma_message) << MessageString; |
| |
| // If the pragma is lexically sound, notify any interested PPCallbacks. |
| if (Callbacks) |
| Callbacks->PragmaMessage(MessageLoc, MessageString); |
| } |
| |
| |
| /// AddPragmaHandler - Add the specified pragma handler to the preprocessor. |
| /// If 'Namespace' is non-null, then it is a token required to exist on the |
| /// pragma line before the pragma string starts, e.g. "STDC" or "GCC". |
| void Preprocessor::AddPragmaHandler(llvm::StringRef Namespace, |
| PragmaHandler *Handler) { |
| PragmaNamespace *InsertNS = PragmaHandlers; |
| |
| // If this is specified to be in a namespace, step down into it. |
| if (!Namespace.empty()) { |
| // If there is already a pragma handler with the name of this namespace, |
| // we either have an error (directive with the same name as a namespace) or |
| // we already have the namespace to insert into. |
| if (PragmaHandler *Existing = PragmaHandlers->FindHandler(Namespace)) { |
| InsertNS = Existing->getIfNamespace(); |
| assert(InsertNS != 0 && "Cannot have a pragma namespace and pragma" |
| " handler with the same name!"); |
| } else { |
| // Otherwise, this namespace doesn't exist yet, create and insert the |
| // handler for it. |
| InsertNS = new PragmaNamespace(Namespace); |
| PragmaHandlers->AddPragma(InsertNS); |
| } |
| } |
| |
| // Check to make sure we don't already have a pragma for this identifier. |
| assert(!InsertNS->FindHandler(Handler->getName()) && |
| "Pragma handler already exists for this identifier!"); |
| InsertNS->AddPragma(Handler); |
| } |
| |
| /// RemovePragmaHandler - Remove the specific pragma handler from the |
| /// preprocessor. If \arg Namespace is non-null, then it should be the |
| /// namespace that \arg Handler was added to. It is an error to remove |
| /// a handler that has not been registered. |
| void Preprocessor::RemovePragmaHandler(llvm::StringRef Namespace, |
| PragmaHandler *Handler) { |
| PragmaNamespace *NS = PragmaHandlers; |
| |
| // If this is specified to be in a namespace, step down into it. |
| if (!Namespace.empty()) { |
| PragmaHandler *Existing = PragmaHandlers->FindHandler(Namespace); |
| assert(Existing && "Namespace containing handler does not exist!"); |
| |
| NS = Existing->getIfNamespace(); |
| assert(NS && "Invalid namespace, registered as a regular pragma handler!"); |
| } |
| |
| NS->RemovePragmaHandler(Handler); |
| |
| // If this is a non-default namespace and it is now empty, remove |
| // it. |
| if (NS != PragmaHandlers && NS->IsEmpty()) |
| PragmaHandlers->RemovePragmaHandler(NS); |
| } |
| |
| namespace { |
| /// PragmaOnceHandler - "#pragma once" marks the file as atomically included. |
| struct PragmaOnceHandler : public PragmaHandler { |
| PragmaOnceHandler() : PragmaHandler("once") {} |
| virtual void HandlePragma(Preprocessor &PP, Token &OnceTok) { |
| PP.CheckEndOfDirective("pragma once"); |
| PP.HandlePragmaOnce(OnceTok); |
| } |
| }; |
| |
| /// PragmaMarkHandler - "#pragma mark ..." is ignored by the compiler, and the |
| /// rest of the line is not lexed. |
| struct PragmaMarkHandler : public PragmaHandler { |
| PragmaMarkHandler() : PragmaHandler("mark") {} |
| virtual void HandlePragma(Preprocessor &PP, Token &MarkTok) { |
| PP.HandlePragmaMark(); |
| } |
| }; |
| |
| /// PragmaPoisonHandler - "#pragma poison x" marks x as not usable. |
| struct PragmaPoisonHandler : public PragmaHandler { |
| PragmaPoisonHandler() : PragmaHandler("poison") {} |
| virtual void HandlePragma(Preprocessor &PP, Token &PoisonTok) { |
| PP.HandlePragmaPoison(PoisonTok); |
| } |
| }; |
| |
| /// PragmaSystemHeaderHandler - "#pragma system_header" marks the current file |
| /// as a system header, which silences warnings in it. |
| struct PragmaSystemHeaderHandler : public PragmaHandler { |
| PragmaSystemHeaderHandler() : PragmaHandler("system_header") {} |
| virtual void HandlePragma(Preprocessor &PP, Token &SHToken) { |
| PP.HandlePragmaSystemHeader(SHToken); |
| PP.CheckEndOfDirective("pragma"); |
| } |
| }; |
| struct PragmaDependencyHandler : public PragmaHandler { |
| PragmaDependencyHandler() : PragmaHandler("dependency") {} |
| virtual void HandlePragma(Preprocessor &PP, Token &DepToken) { |
| PP.HandlePragmaDependency(DepToken); |
| } |
| }; |
| |
| struct PragmaDebugHandler : public PragmaHandler { |
| PragmaDebugHandler() : PragmaHandler("__debug") {} |
| virtual void HandlePragma(Preprocessor &PP, Token &DepToken) { |
| Token Tok; |
| PP.LexUnexpandedToken(Tok); |
| if (Tok.isNot(tok::identifier)) { |
| PP.Diag(Tok, diag::warn_pragma_diagnostic_clang_invalid); |
| return; |
| } |
| IdentifierInfo *II = Tok.getIdentifierInfo(); |
| |
| if (II->isStr("overflow_stack")) { |
| DebugOverflowStack(); |
| } else if (II->isStr("crash")) { |
| DebugCrash(); |
| } |
| } |
| |
| void DebugOverflowStack() { |
| DebugOverflowStack(); |
| } |
| |
| void DebugCrash() { |
| *(volatile int*) 0x11 = 0; |
| } |
| }; |
| |
| /// PragmaDiagnosticHandler - e.g. '#pragma GCC diagnostic ignored "-Wformat"' |
| /// Since clang's diagnostic supports extended functionality beyond GCC's |
| /// the constructor takes a clangMode flag to tell it whether or not to allow |
| /// clang's extended functionality, or whether to reject it. |
| struct PragmaDiagnosticHandler : public PragmaHandler { |
| private: |
| const bool ClangMode; |
| public: |
| explicit PragmaDiagnosticHandler(const bool clangMode) |
| : PragmaHandler("diagnostic"), ClangMode(clangMode) {} |
| |
| virtual void HandlePragma(Preprocessor &PP, Token &DiagToken) { |
| Token Tok; |
| PP.LexUnexpandedToken(Tok); |
| if (Tok.isNot(tok::identifier)) { |
| unsigned Diag = ClangMode ? diag::warn_pragma_diagnostic_clang_invalid |
| : diag::warn_pragma_diagnostic_gcc_invalid; |
| PP.Diag(Tok, Diag); |
| return; |
| } |
| IdentifierInfo *II = Tok.getIdentifierInfo(); |
| |
| diag::Mapping Map; |
| if (II->isStr("warning")) |
| Map = diag::MAP_WARNING; |
| else if (II->isStr("error")) |
| Map = diag::MAP_ERROR; |
| else if (II->isStr("ignored")) |
| Map = diag::MAP_IGNORE; |
| else if (II->isStr("fatal")) |
| Map = diag::MAP_FATAL; |
| else if (ClangMode) { |
| if (II->isStr("pop")) { |
| if (!PP.getDiagnostics().popMappings()) |
| PP.Diag(Tok, diag::warn_pragma_diagnostic_clang_cannot_ppp); |
| return; |
| } |
| |
| if (II->isStr("push")) { |
| PP.getDiagnostics().pushMappings(); |
| return; |
| } |
| |
| PP.Diag(Tok, diag::warn_pragma_diagnostic_clang_invalid); |
| return; |
| } else { |
| PP.Diag(Tok, diag::warn_pragma_diagnostic_gcc_invalid); |
| return; |
| } |
| |
| PP.LexUnexpandedToken(Tok); |
| |
| // We need at least one string. |
| if (Tok.isNot(tok::string_literal)) { |
| PP.Diag(Tok.getLocation(), diag::warn_pragma_diagnostic_invalid_token); |
| return; |
| } |
| |
| // String concatenation allows multiple strings, which can even come from |
| // macro expansion. |
| // "foo " "bar" "Baz" |
| llvm::SmallVector<Token, 4> StrToks; |
| while (Tok.is(tok::string_literal)) { |
| StrToks.push_back(Tok); |
| PP.LexUnexpandedToken(Tok); |
| } |
| |
| if (Tok.isNot(tok::eom)) { |
| PP.Diag(Tok.getLocation(), diag::warn_pragma_diagnostic_invalid_token); |
| return; |
| } |
| |
| // Concatenate and parse the strings. |
| StringLiteralParser Literal(&StrToks[0], StrToks.size(), PP); |
| assert(!Literal.AnyWide && "Didn't allow wide strings in"); |
| if (Literal.hadError) |
| return; |
| if (Literal.Pascal) { |
| unsigned Diag = ClangMode ? diag::warn_pragma_diagnostic_clang_invalid |
| : diag::warn_pragma_diagnostic_gcc_invalid; |
| PP.Diag(Tok, Diag); |
| return; |
| } |
| |
| std::string WarningName(Literal.GetString(), |
| Literal.GetString()+Literal.GetStringLength()); |
| |
| if (WarningName.size() < 3 || WarningName[0] != '-' || |
| WarningName[1] != 'W') { |
| PP.Diag(StrToks[0].getLocation(), |
| diag::warn_pragma_diagnostic_invalid_option); |
| return; |
| } |
| |
| if (PP.getDiagnostics().setDiagnosticGroupMapping(WarningName.c_str()+2, |
| Map)) |
| PP.Diag(StrToks[0].getLocation(), |
| diag::warn_pragma_diagnostic_unknown_warning) << WarningName; |
| } |
| }; |
| |
| /// PragmaCommentHandler - "#pragma comment ...". |
| struct PragmaCommentHandler : public PragmaHandler { |
| PragmaCommentHandler() : PragmaHandler("comment") {} |
| virtual void HandlePragma(Preprocessor &PP, Token &CommentTok) { |
| PP.HandlePragmaComment(CommentTok); |
| } |
| }; |
| |
| /// PragmaMessageHandler - "#pragma message("...")". |
| struct PragmaMessageHandler : public PragmaHandler { |
| PragmaMessageHandler() : PragmaHandler("message") {} |
| virtual void HandlePragma(Preprocessor &PP, Token &CommentTok) { |
| PP.HandlePragmaMessage(CommentTok); |
| } |
| }; |
| |
| // Pragma STDC implementations. |
| |
| enum STDCSetting { |
| STDC_ON, STDC_OFF, STDC_DEFAULT, STDC_INVALID |
| }; |
| |
| static STDCSetting LexOnOffSwitch(Preprocessor &PP) { |
| Token Tok; |
| PP.LexUnexpandedToken(Tok); |
| |
| if (Tok.isNot(tok::identifier)) { |
| PP.Diag(Tok, diag::ext_stdc_pragma_syntax); |
| return STDC_INVALID; |
| } |
| IdentifierInfo *II = Tok.getIdentifierInfo(); |
| STDCSetting Result; |
| if (II->isStr("ON")) |
| Result = STDC_ON; |
| else if (II->isStr("OFF")) |
| Result = STDC_OFF; |
| else if (II->isStr("DEFAULT")) |
| Result = STDC_DEFAULT; |
| else { |
| PP.Diag(Tok, diag::ext_stdc_pragma_syntax); |
| return STDC_INVALID; |
| } |
| |
| // Verify that this is followed by EOM. |
| PP.LexUnexpandedToken(Tok); |
| if (Tok.isNot(tok::eom)) |
| PP.Diag(Tok, diag::ext_stdc_pragma_syntax_eom); |
| return Result; |
| } |
| |
| /// PragmaSTDC_FP_CONTRACTHandler - "#pragma STDC FP_CONTRACT ...". |
| struct PragmaSTDC_FP_CONTRACTHandler : public PragmaHandler { |
| PragmaSTDC_FP_CONTRACTHandler() : PragmaHandler("FP_CONTRACT") {} |
| virtual void HandlePragma(Preprocessor &PP, Token &Tok) { |
| // We just ignore the setting of FP_CONTRACT. Since we don't do contractions |
| // at all, our default is OFF and setting it to ON is an optimization hint |
| // we can safely ignore. When we support -ffma or something, we would need |
| // to diagnose that we are ignoring FMA. |
| LexOnOffSwitch(PP); |
| } |
| }; |
| |
| /// PragmaSTDC_FENV_ACCESSHandler - "#pragma STDC FENV_ACCESS ...". |
| struct PragmaSTDC_FENV_ACCESSHandler : public PragmaHandler { |
| PragmaSTDC_FENV_ACCESSHandler() : PragmaHandler("FENV_ACCESS") {} |
| virtual void HandlePragma(Preprocessor &PP, Token &Tok) { |
| if (LexOnOffSwitch(PP) == STDC_ON) |
| PP.Diag(Tok, diag::warn_stdc_fenv_access_not_supported); |
| } |
| }; |
| |
| /// PragmaSTDC_CX_LIMITED_RANGEHandler - "#pragma STDC CX_LIMITED_RANGE ...". |
| struct PragmaSTDC_CX_LIMITED_RANGEHandler : public PragmaHandler { |
| PragmaSTDC_CX_LIMITED_RANGEHandler() |
| : PragmaHandler("CX_LIMITED_RANGE") {} |
| virtual void HandlePragma(Preprocessor &PP, Token &Tok) { |
| LexOnOffSwitch(PP); |
| } |
| }; |
| |
| /// PragmaSTDC_UnknownHandler - "#pragma STDC ...". |
| struct PragmaSTDC_UnknownHandler : public PragmaHandler { |
| PragmaSTDC_UnknownHandler() {} |
| virtual void HandlePragma(Preprocessor &PP, Token &UnknownTok) { |
| // C99 6.10.6p2, unknown forms are not allowed. |
| PP.Diag(UnknownTok, diag::ext_stdc_pragma_ignored); |
| } |
| }; |
| |
| } // end anonymous namespace |
| |
| |
| /// RegisterBuiltinPragmas - Install the standard preprocessor pragmas: |
| /// #pragma GCC poison/system_header/dependency and #pragma once. |
| void Preprocessor::RegisterBuiltinPragmas() { |
| AddPragmaHandler(new PragmaOnceHandler()); |
| AddPragmaHandler(new PragmaMarkHandler()); |
| |
| // #pragma GCC ... |
| AddPragmaHandler("GCC", new PragmaPoisonHandler()); |
| AddPragmaHandler("GCC", new PragmaSystemHeaderHandler()); |
| AddPragmaHandler("GCC", new PragmaDependencyHandler()); |
| AddPragmaHandler("GCC", new PragmaDiagnosticHandler(false)); |
| // #pragma clang ... |
| AddPragmaHandler("clang", new PragmaPoisonHandler()); |
| AddPragmaHandler("clang", new PragmaSystemHeaderHandler()); |
| AddPragmaHandler("clang", new PragmaDebugHandler()); |
| AddPragmaHandler("clang", new PragmaDependencyHandler()); |
| AddPragmaHandler("clang", new PragmaDiagnosticHandler(true)); |
| |
| AddPragmaHandler("STDC", new PragmaSTDC_FP_CONTRACTHandler()); |
| AddPragmaHandler("STDC", new PragmaSTDC_FENV_ACCESSHandler()); |
| AddPragmaHandler("STDC", new PragmaSTDC_CX_LIMITED_RANGEHandler()); |
| AddPragmaHandler("STDC", new PragmaSTDC_UnknownHandler()); |
| |
| // MS extensions. |
| if (Features.Microsoft) { |
| AddPragmaHandler(new PragmaCommentHandler()); |
| AddPragmaHandler(new PragmaMessageHandler()); |
| } |
| } |