Check in LLVM r95781.
diff --git a/lib/Lex/Pragma.cpp b/lib/Lex/Pragma.cpp
new file mode 100644
index 0000000..63b23b6
--- /dev/null
+++ b/lib/Lex/Pragma.cpp
@@ -0,0 +1,740 @@
+//===--- 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() {
+}
+
+//===----------------------------------------------------------------------===//
+// PragmaNamespace Implementation.
+//===----------------------------------------------------------------------===//
+
+
+PragmaNamespace::~PragmaNamespace() {
+ for (unsigned i = 0, e = Handlers.size(); i != e; ++i)
+ delete Handlers[i];
+}
+
+/// 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(const IdentifierInfo *Name,
+ bool IgnoreNull) const {
+ PragmaHandler *NullHandler = 0;
+ for (unsigned i = 0, e = Handlers.size(); i != e; ++i) {
+ if (Handlers[i]->getName() == Name)
+ return Handlers[i];
+
+ if (Handlers[i]->getName() == 0)
+ NullHandler = Handlers[i];
+ }
+ return IgnoreNull ? 0 : NullHandler;
+}
+
+void PragmaNamespace::RemovePragmaHandler(PragmaHandler *Handler) {
+ for (unsigned i = 0, e = Handlers.size(); i != e; ++i) {
+ if (Handlers[i] == Handler) {
+ Handlers[i] = Handlers.back();
+ Handlers.pop_back();
+ return;
+ }
+ }
+ assert(0 && "Handler not registered in this namespace");
+}
+
+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(), 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;
+ FilenameBuffer.resize(FilenameTok.getLength());
+
+ const char *FilenameStart = &FilenameBuffer[0];
+ unsigned Len = getSpelling(FilenameTok, FilenameStart);
+ llvm::StringRef Filename(FilenameStart, Len);
+ 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);
+}
+
+
+
+
+/// 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(const char *Namespace,
+ PragmaHandler *Handler) {
+ PragmaNamespace *InsertNS = PragmaHandlers;
+
+ // If this is specified to be in a namespace, step down into it.
+ if (Namespace) {
+ IdentifierInfo *NSID = getIdentifierInfo(Namespace);
+
+ // 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(NSID)) {
+ 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(NSID);
+ 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(const char *Namespace,
+ PragmaHandler *Handler) {
+ PragmaNamespace *NS = PragmaHandlers;
+
+ // If this is specified to be in a namespace, step down into it.
+ if (Namespace) {
+ IdentifierInfo *NSID = getIdentifierInfo(Namespace);
+ PragmaHandler *Existing = PragmaHandlers->FindHandler(NSID);
+ 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(const IdentifierInfo *OnceID) : PragmaHandler(OnceID) {}
+ 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(const IdentifierInfo *MarkID) : PragmaHandler(MarkID) {}
+ virtual void HandlePragma(Preprocessor &PP, Token &MarkTok) {
+ PP.HandlePragmaMark();
+ }
+};
+
+/// PragmaPoisonHandler - "#pragma poison x" marks x as not usable.
+struct PragmaPoisonHandler : public PragmaHandler {
+ PragmaPoisonHandler(const IdentifierInfo *ID) : PragmaHandler(ID) {}
+ 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(const IdentifierInfo *ID) : PragmaHandler(ID) {}
+ virtual void HandlePragma(Preprocessor &PP, Token &SHToken) {
+ PP.HandlePragmaSystemHeader(SHToken);
+ PP.CheckEndOfDirective("pragma");
+ }
+};
+struct PragmaDependencyHandler : public PragmaHandler {
+ PragmaDependencyHandler(const IdentifierInfo *ID) : PragmaHandler(ID) {}
+ virtual void HandlePragma(Preprocessor &PP, Token &DepToken) {
+ PP.HandlePragmaDependency(DepToken);
+ }
+};
+
+/// 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:
+ PragmaDiagnosticHandler(const IdentifierInfo *ID,
+ const bool clangMode) : PragmaHandler(ID),
+ 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(const IdentifierInfo *ID) : PragmaHandler(ID) {}
+ virtual void HandlePragma(Preprocessor &PP, Token &CommentTok) {
+ PP.HandlePragmaComment(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(const IdentifierInfo *ID) : PragmaHandler(ID) {}
+ 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(const IdentifierInfo *ID) : PragmaHandler(ID) {}
+ 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(const IdentifierInfo *ID)
+ : PragmaHandler(ID) {}
+ virtual void HandlePragma(Preprocessor &PP, Token &Tok) {
+ LexOnOffSwitch(PP);
+ }
+};
+
+/// PragmaSTDC_UnknownHandler - "#pragma STDC ...".
+struct PragmaSTDC_UnknownHandler : public PragmaHandler {
+ PragmaSTDC_UnknownHandler() : PragmaHandler(0) {}
+ 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(0, new PragmaOnceHandler(getIdentifierInfo("once")));
+ AddPragmaHandler(0, new PragmaMarkHandler(getIdentifierInfo("mark")));
+
+ // #pragma GCC ...
+ AddPragmaHandler("GCC", new PragmaPoisonHandler(getIdentifierInfo("poison")));
+ AddPragmaHandler("GCC", new PragmaSystemHeaderHandler(
+ getIdentifierInfo("system_header")));
+ AddPragmaHandler("GCC", new PragmaDependencyHandler(
+ getIdentifierInfo("dependency")));
+ AddPragmaHandler("GCC", new PragmaDiagnosticHandler(
+ getIdentifierInfo("diagnostic"),
+ false));
+ // #pragma clang ...
+ AddPragmaHandler("clang", new PragmaPoisonHandler(
+ getIdentifierInfo("poison")));
+ AddPragmaHandler("clang", new PragmaSystemHeaderHandler(
+ getIdentifierInfo("system_header")));
+ AddPragmaHandler("clang", new PragmaDependencyHandler(
+ getIdentifierInfo("dependency")));
+ AddPragmaHandler("clang", new PragmaDiagnosticHandler(
+ getIdentifierInfo("diagnostic"),
+ true));
+
+ AddPragmaHandler("STDC", new PragmaSTDC_FP_CONTRACTHandler(
+ getIdentifierInfo("FP_CONTRACT")));
+ AddPragmaHandler("STDC", new PragmaSTDC_FENV_ACCESSHandler(
+ getIdentifierInfo("FENV_ACCESS")));
+ AddPragmaHandler("STDC", new PragmaSTDC_CX_LIMITED_RANGEHandler(
+ getIdentifierInfo("CX_LIMITED_RANGE")));
+ AddPragmaHandler("STDC", new PragmaSTDC_UnknownHandler());
+
+ // MS extensions.
+ if (Features.Microsoft)
+ AddPragmaHandler(0, new PragmaCommentHandler(getIdentifierInfo("comment")));
+}