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| Current File : //compat/linux/proc/68247/root/usr/src/contrib/llvm/tools/clang/lib/Lex/Pragma.cpp |
//===--- 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/MacroInfo.h"
#include "clang/Lex/LexDiagnostic.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/SourceManager.h"
#include "llvm/Support/CrashRecoveryContext.h"
#include "llvm/Support/ErrorHandling.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,
PragmaIntroducerKind Introducer,
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(StringRef Name,
bool IgnoreNull) const {
if (PragmaHandler *Handler = Handlers.lookup(Name))
return Handler;
return IgnoreNull ? 0 : Handlers.lookup(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,
PragmaIntroducerKind Introducer,
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()
: StringRef(),
/*IgnoreNull=*/false);
if (Handler == 0) {
PP.Diag(Tok, diag::warn_pragma_ignored);
return;
}
// Otherwise, pass it down.
Handler->HandlePragma(PP, Introducer, 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(unsigned Introducer) {
++NumPragma;
// Invoke the first level of pragma handlers which reads the namespace id.
Token Tok;
PragmaHandlers->HandlePragma(*this, PragmaIntroducerKind(Introducer), Tok);
// If the pragma handler didn't read the rest of the line, consume it now.
if ((CurTokenLexer && CurTokenLexer->isParsingPreprocessorDirective())
|| (CurPPLexer && CurPPLexer->ParsingPreprocessorDirective))
DiscardUntilEndOfDirective();
}
namespace {
/// \brief Helper class for \see Preprocessor::Handle_Pragma.
class LexingFor_PragmaRAII {
Preprocessor &PP;
bool InMacroArgPreExpansion;
bool Failed;
Token &OutTok;
Token PragmaTok;
public:
LexingFor_PragmaRAII(Preprocessor &PP, bool InMacroArgPreExpansion,
Token &Tok)
: PP(PP), InMacroArgPreExpansion(InMacroArgPreExpansion),
Failed(false), OutTok(Tok) {
if (InMacroArgPreExpansion) {
PragmaTok = OutTok;
PP.EnableBacktrackAtThisPos();
}
}
~LexingFor_PragmaRAII() {
if (InMacroArgPreExpansion) {
if (Failed) {
PP.CommitBacktrackedTokens();
} else {
PP.Backtrack();
OutTok = PragmaTok;
}
}
}
void failed() {
Failed = true;
}
};
}
/// 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) {
// This works differently if we are pre-expanding a macro argument.
// In that case we don't actually "activate" the pragma now, we only lex it
// until we are sure it is lexically correct and then we backtrack so that
// we activate the pragma whenever we encounter the tokens again in the token
// stream. This ensures that we will activate it in the correct location
// or that we will ignore it if it never enters the token stream, e.g:
//
// #define EMPTY(x)
// #define INACTIVE(x) EMPTY(x)
// INACTIVE(_Pragma("clang diagnostic ignored \"-Wconversion\""))
LexingFor_PragmaRAII _PragmaLexing(*this, InMacroArgPreExpansion, 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 _PragmaLexing.failed();
}
// Read the '"..."'.
Lex(Tok);
if (Tok.isNot(tok::string_literal) && Tok.isNot(tok::wide_string_literal)) {
Diag(PragmaLoc, diag::err__Pragma_malformed);
// Skip this token, and the ')', if present.
if (Tok.isNot(tok::r_paren))
Lex(Tok);
if (Tok.is(tok::r_paren))
Lex(Tok);
return _PragmaLexing.failed();
}
if (Tok.hasUDSuffix()) {
Diag(Tok, diag::err_invalid_string_udl);
// Skip this token, and the ')', if present.
Lex(Tok);
if (Tok.is(tok::r_paren))
Lex(Tok);
return _PragmaLexing.failed();
}
// Remember the string.
Token StrTok = Tok;
// Read the ')'.
Lex(Tok);
if (Tok.isNot(tok::r_paren)) {
Diag(PragmaLoc, diag::err__Pragma_malformed);
return _PragmaLexing.failed();
}
if (InMacroArgPreExpansion)
return;
SourceLocation RParenLoc = Tok.getLocation();
std::string StrVal = getSpelling(StrTok);
// 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(PIK__Pragma);
// Finally, return whatever came after the pragma directive.
return Lex(Tok);
}
/// HandleMicrosoft__pragma - Like Handle_Pragma except the pragma text
/// is not enclosed within a string literal.
void Preprocessor::HandleMicrosoft__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;
}
// Get the tokens enclosed within the __pragma(), as well as the final ')'.
SmallVector<Token, 32> PragmaToks;
int NumParens = 0;
Lex(Tok);
while (Tok.isNot(tok::eof)) {
PragmaToks.push_back(Tok);
if (Tok.is(tok::l_paren))
NumParens++;
else if (Tok.is(tok::r_paren) && NumParens-- == 0)
break;
Lex(Tok);
}
if (Tok.is(tok::eof)) {
Diag(PragmaLoc, diag::err_unterminated___pragma);
return;
}
PragmaToks.front().setFlag(Token::LeadingSpace);
// Replace the ')' with an EOD to mark the end of the pragma.
PragmaToks.back().setKind(tok::eod);
Token *TokArray = new Token[PragmaToks.size()];
std::copy(PragmaToks.begin(), PragmaToks.end(), TokArray);
// Push the tokens onto the stack.
EnterTokenStream(TokArray, PragmaToks.size(), true, true);
// With everything set up, lex this as a #pragma directive.
HandlePragmaDirective(PIK___pragma);
// 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::eod)) return;
// Can only poison identifiers.
if (Tok.isNot(tok::raw_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();
if (II->isFromAST())
II->setChangedSinceDeserialization();
}
}
/// 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());
if (PLoc.isInvalid())
return;
unsigned FilenameID = SourceMgr.getLineTableFilenameID(PLoc.getFilename());
// Notify the client, if desired, that we are in a new source file.
if (Callbacks)
Callbacks->FileChanged(SysHeaderTok.getLocation(),
PPCallbacks::SystemHeaderPragma, SrcMgr::C_System);
// 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);
}
/// HandlePragmaDependency - Handle #pragma GCC dependency "foo" blah.
///
void Preprocessor::HandlePragmaDependency(Token &DependencyTok) {
Token FilenameTok;
CurPPLexer->LexIncludeFilename(FilenameTok);
// If the token kind is EOD, the error has already been diagnosed.
if (FilenameTok.is(tok::eod))
return;
// Reserve a buffer to get the spelling.
SmallString<128> FilenameBuffer;
bool Invalid = false;
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, NULL, NULL,
NULL);
if (File == 0) {
if (!SuppressIncludeNotFoundError)
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::eod)) {
Message += getSpelling(DependencyTok) + " ";
Lex(DependencyTok);
}
// Remove the trailing ' ' if present.
if (!Message.empty())
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"
SmallVector<Token, 4> StrToks;
while (Tok.is(tok::string_literal)) {
if (Tok.hasUDSuffix())
Diag(Tok, diag::err_invalid_string_udl);
StrToks.push_back(Tok);
Lex(Tok);
}
// Concatenate and parse the strings.
StringLiteralParser Literal(&StrToks[0], StrToks.size(), *this);
assert(Literal.isAscii() && "Didn't allow wide strings in");
if (Literal.hadError)
return;
if (Literal.Pascal) {
Diag(StrToks[0].getLocation(), diag::err_pragma_comment_malformed);
return;
}
ArgumentString = Literal.GetString();
}
// 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::eod)) {
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 and gcc #pragma message
/// extension. The syntax is:
/// #pragma message(string)
/// OR, in GCC mode:
/// #pragma message string
/// string 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);
bool ExpectClosingParen = false;
switch (Tok.getKind()) {
case tok::l_paren:
// We have a MSVC style pragma message.
ExpectClosingParen = true;
// Read the string.
Lex(Tok);
break;
case tok::string_literal:
// We have a GCC style pragma message, and we just read the string.
break;
default:
Diag(MessageLoc, diag::err_pragma_message_malformed);
return;
}
// 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"
SmallVector<Token, 4> StrToks;
while (Tok.is(tok::string_literal)) {
if (Tok.hasUDSuffix())
Diag(Tok, diag::err_invalid_string_udl);
StrToks.push_back(Tok);
Lex(Tok);
}
// Concatenate and parse the strings.
StringLiteralParser Literal(&StrToks[0], StrToks.size(), *this);
assert(Literal.isAscii() && "Didn't allow wide strings in");
if (Literal.hadError)
return;
if (Literal.Pascal) {
Diag(StrToks[0].getLocation(), diag::err_pragma_message_malformed);
return;
}
StringRef MessageString(Literal.GetString());
if (ExpectClosingParen) {
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::eod)) {
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);
}
/// ParsePragmaPushOrPopMacro - Handle parsing of pragma push_macro/pop_macro.
/// Return the IdentifierInfo* associated with the macro to push or pop.
IdentifierInfo *Preprocessor::ParsePragmaPushOrPopMacro(Token &Tok) {
// Remember the pragma token location.
Token PragmaTok = Tok;
// Read the '('.
Lex(Tok);
if (Tok.isNot(tok::l_paren)) {
Diag(PragmaTok.getLocation(), diag::err_pragma_push_pop_macro_malformed)
<< getSpelling(PragmaTok);
return 0;
}
// Read the macro name string.
Lex(Tok);
if (Tok.isNot(tok::string_literal)) {
Diag(PragmaTok.getLocation(), diag::err_pragma_push_pop_macro_malformed)
<< getSpelling(PragmaTok);
return 0;
}
if (Tok.hasUDSuffix()) {
Diag(Tok, diag::err_invalid_string_udl);
return 0;
}
// Remember the macro string.
std::string StrVal = getSpelling(Tok);
// Read the ')'.
Lex(Tok);
if (Tok.isNot(tok::r_paren)) {
Diag(PragmaTok.getLocation(), diag::err_pragma_push_pop_macro_malformed)
<< getSpelling(PragmaTok);
return 0;
}
assert(StrVal[0] == '"' && StrVal[StrVal.size()-1] == '"' &&
"Invalid string token!");
// Create a Token from the string.
Token MacroTok;
MacroTok.startToken();
MacroTok.setKind(tok::raw_identifier);
CreateString(&StrVal[1], StrVal.size() - 2, MacroTok);
// Get the IdentifierInfo of MacroToPushTok.
return LookUpIdentifierInfo(MacroTok);
}
/// HandlePragmaPushMacro - Handle #pragma push_macro.
/// The syntax is:
/// #pragma push_macro("macro")
void Preprocessor::HandlePragmaPushMacro(Token &PushMacroTok) {
// Parse the pragma directive and get the macro IdentifierInfo*.
IdentifierInfo *IdentInfo = ParsePragmaPushOrPopMacro(PushMacroTok);
if (!IdentInfo) return;
// Get the MacroInfo associated with IdentInfo.
MacroInfo *MI = getMacroInfo(IdentInfo);
MacroInfo *MacroCopyToPush = 0;
if (MI) {
// Make a clone of MI.
MacroCopyToPush = CloneMacroInfo(*MI);
// Allow the original MacroInfo to be redefined later.
MI->setIsAllowRedefinitionsWithoutWarning(true);
}
// Push the cloned MacroInfo so we can retrieve it later.
PragmaPushMacroInfo[IdentInfo].push_back(MacroCopyToPush);
}
/// HandlePragmaPopMacro - Handle #pragma pop_macro.
/// The syntax is:
/// #pragma pop_macro("macro")
void Preprocessor::HandlePragmaPopMacro(Token &PopMacroTok) {
SourceLocation MessageLoc = PopMacroTok.getLocation();
// Parse the pragma directive and get the macro IdentifierInfo*.
IdentifierInfo *IdentInfo = ParsePragmaPushOrPopMacro(PopMacroTok);
if (!IdentInfo) return;
// Find the vector<MacroInfo*> associated with the macro.
llvm::DenseMap<IdentifierInfo*, std::vector<MacroInfo*> >::iterator iter =
PragmaPushMacroInfo.find(IdentInfo);
if (iter != PragmaPushMacroInfo.end()) {
// Release the MacroInfo currently associated with IdentInfo.
MacroInfo *CurrentMI = getMacroInfo(IdentInfo);
if (CurrentMI) {
if (CurrentMI->isWarnIfUnused())
WarnUnusedMacroLocs.erase(CurrentMI->getDefinitionLoc());
ReleaseMacroInfo(CurrentMI);
}
// Get the MacroInfo we want to reinstall.
MacroInfo *MacroToReInstall = iter->second.back();
// Reinstall the previously pushed macro.
setMacroInfo(IdentInfo, MacroToReInstall);
// Pop PragmaPushMacroInfo stack.
iter->second.pop_back();
if (iter->second.size() == 0)
PragmaPushMacroInfo.erase(iter);
} else {
Diag(MessageLoc, diag::warn_pragma_pop_macro_no_push)
<< IdentInfo->getName();
}
}
void Preprocessor::HandlePragmaIncludeAlias(Token &Tok) {
// We will either get a quoted filename or a bracketed filename, and we
// have to track which we got. The first filename is the source name,
// and the second name is the mapped filename. If the first is quoted,
// the second must be as well (cannot mix and match quotes and brackets).
// Get the open paren
Lex(Tok);
if (Tok.isNot(tok::l_paren)) {
Diag(Tok, diag::warn_pragma_include_alias_expected) << "(";
return;
}
// We expect either a quoted string literal, or a bracketed name
Token SourceFilenameTok;
CurPPLexer->LexIncludeFilename(SourceFilenameTok);
if (SourceFilenameTok.is(tok::eod)) {
// The diagnostic has already been handled
return;
}
StringRef SourceFileName;
SmallString<128> FileNameBuffer;
if (SourceFilenameTok.is(tok::string_literal) ||
SourceFilenameTok.is(tok::angle_string_literal)) {
SourceFileName = getSpelling(SourceFilenameTok, FileNameBuffer);
} else if (SourceFilenameTok.is(tok::less)) {
// This could be a path instead of just a name
FileNameBuffer.push_back('<');
SourceLocation End;
if (ConcatenateIncludeName(FileNameBuffer, End))
return; // Diagnostic already emitted
SourceFileName = FileNameBuffer.str();
} else {
Diag(Tok, diag::warn_pragma_include_alias_expected_filename);
return;
}
FileNameBuffer.clear();
// Now we expect a comma, followed by another include name
Lex(Tok);
if (Tok.isNot(tok::comma)) {
Diag(Tok, diag::warn_pragma_include_alias_expected) << ",";
return;
}
Token ReplaceFilenameTok;
CurPPLexer->LexIncludeFilename(ReplaceFilenameTok);
if (ReplaceFilenameTok.is(tok::eod)) {
// The diagnostic has already been handled
return;
}
StringRef ReplaceFileName;
if (ReplaceFilenameTok.is(tok::string_literal) ||
ReplaceFilenameTok.is(tok::angle_string_literal)) {
ReplaceFileName = getSpelling(ReplaceFilenameTok, FileNameBuffer);
} else if (ReplaceFilenameTok.is(tok::less)) {
// This could be a path instead of just a name
FileNameBuffer.push_back('<');
SourceLocation End;
if (ConcatenateIncludeName(FileNameBuffer, End))
return; // Diagnostic already emitted
ReplaceFileName = FileNameBuffer.str();
} else {
Diag(Tok, diag::warn_pragma_include_alias_expected_filename);
return;
}
// Finally, we expect the closing paren
Lex(Tok);
if (Tok.isNot(tok::r_paren)) {
Diag(Tok, diag::warn_pragma_include_alias_expected) << ")";
return;
}
// Now that we have the source and target filenames, we need to make sure
// they're both of the same type (angled vs non-angled)
StringRef OriginalSource = SourceFileName;
bool SourceIsAngled =
GetIncludeFilenameSpelling(SourceFilenameTok.getLocation(),
SourceFileName);
bool ReplaceIsAngled =
GetIncludeFilenameSpelling(ReplaceFilenameTok.getLocation(),
ReplaceFileName);
if (!SourceFileName.empty() && !ReplaceFileName.empty() &&
(SourceIsAngled != ReplaceIsAngled)) {
unsigned int DiagID;
if (SourceIsAngled)
DiagID = diag::warn_pragma_include_alias_mismatch_angle;
else
DiagID = diag::warn_pragma_include_alias_mismatch_quote;
Diag(SourceFilenameTok.getLocation(), DiagID)
<< SourceFileName
<< ReplaceFileName;
return;
}
// Now we can let the include handler know about this mapping
getHeaderSearchInfo().AddIncludeAlias(OriginalSource, ReplaceFileName);
}
/// 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(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(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);
delete NS;
}
}
bool Preprocessor::LexOnOffSwitch(tok::OnOffSwitch &Result) {
Token Tok;
LexUnexpandedToken(Tok);
if (Tok.isNot(tok::identifier)) {
Diag(Tok, diag::ext_on_off_switch_syntax);
return true;
}
IdentifierInfo *II = Tok.getIdentifierInfo();
if (II->isStr("ON"))
Result = tok::OOS_ON;
else if (II->isStr("OFF"))
Result = tok::OOS_OFF;
else if (II->isStr("DEFAULT"))
Result = tok::OOS_DEFAULT;
else {
Diag(Tok, diag::ext_on_off_switch_syntax);
return true;
}
// Verify that this is followed by EOD.
LexUnexpandedToken(Tok);
if (Tok.isNot(tok::eod))
Diag(Tok, diag::ext_pragma_syntax_eod);
return false;
}
namespace {
/// PragmaOnceHandler - "#pragma once" marks the file as atomically included.
struct PragmaOnceHandler : public PragmaHandler {
PragmaOnceHandler() : PragmaHandler("once") {}
virtual void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
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, PragmaIntroducerKind Introducer,
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, PragmaIntroducerKind Introducer,
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, PragmaIntroducerKind Introducer,
Token &SHToken) {
PP.HandlePragmaSystemHeader(SHToken);
PP.CheckEndOfDirective("pragma");
}
};
struct PragmaDependencyHandler : public PragmaHandler {
PragmaDependencyHandler() : PragmaHandler("dependency") {}
virtual void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &DepToken) {
PP.HandlePragmaDependency(DepToken);
}
};
struct PragmaDebugHandler : public PragmaHandler {
PragmaDebugHandler() : PragmaHandler("__debug") {}
virtual void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &DepToken) {
Token Tok;
PP.LexUnexpandedToken(Tok);
if (Tok.isNot(tok::identifier)) {
PP.Diag(Tok, diag::warn_pragma_diagnostic_invalid);
return;
}
IdentifierInfo *II = Tok.getIdentifierInfo();
if (II->isStr("assert")) {
llvm_unreachable("This is an assertion!");
} else if (II->isStr("crash")) {
*(volatile int*) 0x11 = 0;
} else if (II->isStr("llvm_fatal_error")) {
llvm::report_fatal_error("#pragma clang __debug llvm_fatal_error");
} else if (II->isStr("llvm_unreachable")) {
llvm_unreachable("#pragma clang __debug llvm_unreachable");
} else if (II->isStr("overflow_stack")) {
DebugOverflowStack();
} else if (II->isStr("handle_crash")) {
llvm::CrashRecoveryContext *CRC =llvm::CrashRecoveryContext::GetCurrent();
if (CRC)
CRC->HandleCrash();
} else {
PP.Diag(Tok, diag::warn_pragma_debug_unexpected_command)
<< II->getName();
}
}
// Disable MSVC warning about runtime stack overflow.
#ifdef _MSC_VER
#pragma warning(disable : 4717)
#endif
void DebugOverflowStack() {
DebugOverflowStack();
}
#ifdef _MSC_VER
#pragma warning(default : 4717)
#endif
};
/// PragmaDiagnosticHandler - e.g. '#pragma GCC diagnostic ignored "-Wformat"'
struct PragmaDiagnosticHandler : public PragmaHandler {
private:
const char *Namespace;
public:
explicit PragmaDiagnosticHandler(const char *NS) :
PragmaHandler("diagnostic"), Namespace(NS) {}
virtual void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &DiagToken) {
SourceLocation DiagLoc = DiagToken.getLocation();
Token Tok;
PP.LexUnexpandedToken(Tok);
if (Tok.isNot(tok::identifier)) {
PP.Diag(Tok, diag::warn_pragma_diagnostic_invalid);
return;
}
IdentifierInfo *II = Tok.getIdentifierInfo();
PPCallbacks *Callbacks = PP.getPPCallbacks();
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 (II->isStr("pop")) {
if (!PP.getDiagnostics().popMappings(DiagLoc))
PP.Diag(Tok, diag::warn_pragma_diagnostic_cannot_pop);
else if (Callbacks)
Callbacks->PragmaDiagnosticPop(DiagLoc, Namespace);
return;
} else if (II->isStr("push")) {
PP.getDiagnostics().pushMappings(DiagLoc);
if (Callbacks)
Callbacks->PragmaDiagnosticPush(DiagLoc, Namespace);
return;
} else {
PP.Diag(Tok, diag::warn_pragma_diagnostic_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"
SmallVector<Token, 4> StrToks;
while (Tok.is(tok::string_literal)) {
StrToks.push_back(Tok);
PP.LexUnexpandedToken(Tok);
}
if (Tok.isNot(tok::eod)) {
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.isAscii() && "Didn't allow wide strings in");
if (Literal.hadError)
return;
if (Literal.Pascal) {
PP.Diag(Tok, diag::warn_pragma_diagnostic_invalid);
return;
}
StringRef WarningName(Literal.GetString());
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.substr(2),
Map, DiagLoc))
PP.Diag(StrToks[0].getLocation(),
diag::warn_pragma_diagnostic_unknown_warning) << WarningName;
else if (Callbacks)
Callbacks->PragmaDiagnostic(DiagLoc, Namespace, Map, WarningName);
}
};
/// PragmaCommentHandler - "#pragma comment ...".
struct PragmaCommentHandler : public PragmaHandler {
PragmaCommentHandler() : PragmaHandler("comment") {}
virtual void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &CommentTok) {
PP.HandlePragmaComment(CommentTok);
}
};
/// PragmaIncludeAliasHandler - "#pragma include_alias("...")".
struct PragmaIncludeAliasHandler : public PragmaHandler {
PragmaIncludeAliasHandler() : PragmaHandler("include_alias") {}
virtual void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &IncludeAliasTok) {
PP.HandlePragmaIncludeAlias(IncludeAliasTok);
}
};
/// PragmaMessageHandler - "#pragma message("...")".
struct PragmaMessageHandler : public PragmaHandler {
PragmaMessageHandler() : PragmaHandler("message") {}
virtual void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &CommentTok) {
PP.HandlePragmaMessage(CommentTok);
}
};
/// PragmaPushMacroHandler - "#pragma push_macro" saves the value of the
/// macro on the top of the stack.
struct PragmaPushMacroHandler : public PragmaHandler {
PragmaPushMacroHandler() : PragmaHandler("push_macro") {}
virtual void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &PushMacroTok) {
PP.HandlePragmaPushMacro(PushMacroTok);
}
};
/// PragmaPopMacroHandler - "#pragma pop_macro" sets the value of the
/// macro to the value on the top of the stack.
struct PragmaPopMacroHandler : public PragmaHandler {
PragmaPopMacroHandler() : PragmaHandler("pop_macro") {}
virtual void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &PopMacroTok) {
PP.HandlePragmaPopMacro(PopMacroTok);
}
};
// Pragma STDC implementations.
/// PragmaSTDC_FENV_ACCESSHandler - "#pragma STDC FENV_ACCESS ...".
struct PragmaSTDC_FENV_ACCESSHandler : public PragmaHandler {
PragmaSTDC_FENV_ACCESSHandler() : PragmaHandler("FENV_ACCESS") {}
virtual void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &Tok) {
tok::OnOffSwitch OOS;
if (PP.LexOnOffSwitch(OOS))
return;
if (OOS == tok::OOS_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, PragmaIntroducerKind Introducer,
Token &Tok) {
tok::OnOffSwitch OOS;
PP.LexOnOffSwitch(OOS);
}
};
/// PragmaSTDC_UnknownHandler - "#pragma STDC ...".
struct PragmaSTDC_UnknownHandler : public PragmaHandler {
PragmaSTDC_UnknownHandler() {}
virtual void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &UnknownTok) {
// C99 6.10.6p2, unknown forms are not allowed.
PP.Diag(UnknownTok, diag::ext_stdc_pragma_ignored);
}
};
/// PragmaARCCFCodeAuditedHandler -
/// #pragma clang arc_cf_code_audited begin/end
struct PragmaARCCFCodeAuditedHandler : public PragmaHandler {
PragmaARCCFCodeAuditedHandler() : PragmaHandler("arc_cf_code_audited") {}
virtual void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
Token &NameTok) {
SourceLocation Loc = NameTok.getLocation();
bool IsBegin;
Token Tok;
// Lex the 'begin' or 'end'.
PP.LexUnexpandedToken(Tok);
const IdentifierInfo *BeginEnd = Tok.getIdentifierInfo();
if (BeginEnd && BeginEnd->isStr("begin")) {
IsBegin = true;
} else if (BeginEnd && BeginEnd->isStr("end")) {
IsBegin = false;
} else {
PP.Diag(Tok.getLocation(), diag::err_pp_arc_cf_code_audited_syntax);
return;
}
// Verify that this is followed by EOD.
PP.LexUnexpandedToken(Tok);
if (Tok.isNot(tok::eod))
PP.Diag(Tok, diag::ext_pp_extra_tokens_at_eol) << "pragma";
// The start location of the active audit.
SourceLocation BeginLoc = PP.getPragmaARCCFCodeAuditedLoc();
// The start location we want after processing this.
SourceLocation NewLoc;
if (IsBegin) {
// Complain about attempts to re-enter an audit.
if (BeginLoc.isValid()) {
PP.Diag(Loc, diag::err_pp_double_begin_of_arc_cf_code_audited);
PP.Diag(BeginLoc, diag::note_pragma_entered_here);
}
NewLoc = Loc;
} else {
// Complain about attempts to leave an audit that doesn't exist.
if (!BeginLoc.isValid()) {
PP.Diag(Loc, diag::err_pp_unmatched_end_of_arc_cf_code_audited);
return;
}
NewLoc = SourceLocation();
}
PP.setPragmaARCCFCodeAuditedLoc(NewLoc);
}
};
} // 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());
AddPragmaHandler(new PragmaPushMacroHandler());
AddPragmaHandler(new PragmaPopMacroHandler());
AddPragmaHandler(new PragmaMessageHandler());
// #pragma GCC ...
AddPragmaHandler("GCC", new PragmaPoisonHandler());
AddPragmaHandler("GCC", new PragmaSystemHeaderHandler());
AddPragmaHandler("GCC", new PragmaDependencyHandler());
AddPragmaHandler("GCC", new PragmaDiagnosticHandler("GCC"));
// #pragma clang ...
AddPragmaHandler("clang", new PragmaPoisonHandler());
AddPragmaHandler("clang", new PragmaSystemHeaderHandler());
AddPragmaHandler("clang", new PragmaDebugHandler());
AddPragmaHandler("clang", new PragmaDependencyHandler());
AddPragmaHandler("clang", new PragmaDiagnosticHandler("clang"));
AddPragmaHandler("clang", new PragmaARCCFCodeAuditedHandler());
AddPragmaHandler("STDC", new PragmaSTDC_FENV_ACCESSHandler());
AddPragmaHandler("STDC", new PragmaSTDC_CX_LIMITED_RANGEHandler());
AddPragmaHandler("STDC", new PragmaSTDC_UnknownHandler());
// MS extensions.
if (LangOpts.MicrosoftExt) {
AddPragmaHandler(new PragmaCommentHandler());
AddPragmaHandler(new PragmaIncludeAliasHandler());
}
}