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llvm-project/clang/lib/Lex/PPDirectives.cpp
Ted Kremenek c8456f8c59 Really^2 fix <rdar://problem/8361834>, this time without crashing. 
Now MICache is a linked list (per the FIXME), where we tradeoff between MacroInfo objects being in MICache
and MIChainHead.  MacroInfo objects in the MICache chain are already "Destroy()'ed", so they can be reused.  When
inserting into MICache, we need to remove them from the regular linked list so that they aren't destroyed more than
once.

llvm-svn: 116869
2010-10-19 22:15:20 +00:00

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//===--- PPDirectives.cpp - Directive Handling for Preprocessor -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements # directive processing for the Preprocessor.
//
//===----------------------------------------------------------------------===//
#include "clang/Lex/Preprocessor.h"
#include "clang/Lex/LiteralSupport.h"
#include "clang/Lex/HeaderSearch.h"
#include "clang/Lex/MacroInfo.h"
#include "clang/Lex/LexDiagnostic.h"
#include "clang/Lex/CodeCompletionHandler.h"
#include "clang/Lex/Pragma.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/SourceManager.h"
#include "llvm/ADT/APInt.h"
using namespace clang;
//===----------------------------------------------------------------------===//
// Utility Methods for Preprocessor Directive Handling.
//===----------------------------------------------------------------------===//
MacroInfo *Preprocessor::AllocateMacroInfo() {
MacroInfoChain *MIChain;
if (MICache) {
MIChain = MICache;
MICache = MICache->Next;
}
else {
MIChain = BP.Allocate<MacroInfoChain>();
}
MIChain->Next = MIChainHead;
MIChain->Prev = 0;
if (MIChainHead)
MIChainHead->Prev = MIChain;
MIChainHead = MIChain;
return &(MIChain->MI);
}
MacroInfo *Preprocessor::AllocateMacroInfo(SourceLocation L) {
MacroInfo *MI = AllocateMacroInfo();
new (MI) MacroInfo(L);
return MI;
}
MacroInfo *Preprocessor::CloneMacroInfo(const MacroInfo &MacroToClone) {
MacroInfo *MI = AllocateMacroInfo();
new (MI) MacroInfo(MacroToClone, BP);
return MI;
}
/// ReleaseMacroInfo - Release the specified MacroInfo. This memory will
/// be reused for allocating new MacroInfo objects.
void Preprocessor::ReleaseMacroInfo(MacroInfo *MI) {
MacroInfoChain *MIChain = (MacroInfoChain*) MI;
if (MacroInfoChain *Prev = MIChain->Prev) {
MacroInfoChain *Next = MIChain->Next;
Prev->Next = Next;
if (Next)
Next->Prev = Prev;
}
else {
assert(MIChainHead == MIChain);
MIChainHead = MIChain->Next;
MIChainHead->Prev = 0;
}
MIChain->Next = MICache;
MICache = MIChain;
MI->Destroy();
}
/// DiscardUntilEndOfDirective - Read and discard all tokens remaining on the
/// current line until the tok::eom token is found.
void Preprocessor::DiscardUntilEndOfDirective() {
Token Tmp;
do {
LexUnexpandedToken(Tmp);
} while (Tmp.isNot(tok::eom));
}
/// ReadMacroName - Lex and validate a macro name, which occurs after a
/// #define or #undef. This sets the token kind to eom and discards the rest
/// of the macro line if the macro name is invalid. isDefineUndef is 1 if
/// this is due to a a #define, 2 if #undef directive, 0 if it is something
/// else (e.g. #ifdef).
void Preprocessor::ReadMacroName(Token &MacroNameTok, char isDefineUndef) {
// Read the token, don't allow macro expansion on it.
LexUnexpandedToken(MacroNameTok);
if (MacroNameTok.is(tok::code_completion)) {
if (CodeComplete)
CodeComplete->CodeCompleteMacroName(isDefineUndef == 1);
LexUnexpandedToken(MacroNameTok);
return;
}
// Missing macro name?
if (MacroNameTok.is(tok::eom)) {
Diag(MacroNameTok, diag::err_pp_missing_macro_name);
return;
}
IdentifierInfo *II = MacroNameTok.getIdentifierInfo();
if (II == 0) {
bool Invalid = false;
std::string Spelling = getSpelling(MacroNameTok, &Invalid);
if (Invalid)
return;
const IdentifierInfo &Info = Identifiers.get(Spelling);
if (Info.isCPlusPlusOperatorKeyword())
// C++ 2.5p2: Alternative tokens behave the same as its primary token
// except for their spellings.
Diag(MacroNameTok, diag::err_pp_operator_used_as_macro_name) << Spelling;
else
Diag(MacroNameTok, diag::err_pp_macro_not_identifier);
// Fall through on error.
} else if (isDefineUndef && II->getPPKeywordID() == tok::pp_defined) {
// Error if defining "defined": C99 6.10.8.4.
Diag(MacroNameTok, diag::err_defined_macro_name);
} else if (isDefineUndef && II->hasMacroDefinition() &&
getMacroInfo(II)->isBuiltinMacro()) {
// Error if defining "__LINE__" and other builtins: C99 6.10.8.4.
if (isDefineUndef == 1)
Diag(MacroNameTok, diag::pp_redef_builtin_macro);
else
Diag(MacroNameTok, diag::pp_undef_builtin_macro);
} else {
// Okay, we got a good identifier node. Return it.
return;
}
// Invalid macro name, read and discard the rest of the line. Then set the
// token kind to tok::eom.
MacroNameTok.setKind(tok::eom);
return DiscardUntilEndOfDirective();
}
/// CheckEndOfDirective - Ensure that the next token is a tok::eom token. If
/// not, emit a diagnostic and consume up until the eom. If EnableMacros is
/// true, then we consider macros that expand to zero tokens as being ok.
void Preprocessor::CheckEndOfDirective(const char *DirType, bool EnableMacros) {
Token Tmp;
// Lex unexpanded tokens for most directives: macros might expand to zero
// tokens, causing us to miss diagnosing invalid lines. Some directives (like
// #line) allow empty macros.
if (EnableMacros)
Lex(Tmp);
else
LexUnexpandedToken(Tmp);
// There should be no tokens after the directive, but we allow them as an
// extension.
while (Tmp.is(tok::comment)) // Skip comments in -C mode.
LexUnexpandedToken(Tmp);
if (Tmp.isNot(tok::eom)) {
// Add a fixit in GNU/C99/C++ mode. Don't offer a fixit for strict-C89,
// because it is more trouble than it is worth to insert /**/ and check that
// there is no /**/ in the range also.
FixItHint Hint;
if (Features.GNUMode || Features.C99 || Features.CPlusPlus)
Hint = FixItHint::CreateInsertion(Tmp.getLocation(),"//");
Diag(Tmp, diag::ext_pp_extra_tokens_at_eol) << DirType << Hint;
DiscardUntilEndOfDirective();
}
}
/// SkipExcludedConditionalBlock - We just read a #if or related directive and
/// decided that the subsequent tokens are in the #if'd out portion of the
/// file. Lex the rest of the file, until we see an #endif. If
/// FoundNonSkipPortion is true, then we have already emitted code for part of
/// this #if directive, so #else/#elif blocks should never be entered. If ElseOk
/// is true, then #else directives are ok, if not, then we have already seen one
/// so a #else directive is a duplicate. When this returns, the caller can lex
/// the first valid token.
void Preprocessor::SkipExcludedConditionalBlock(SourceLocation IfTokenLoc,
bool FoundNonSkipPortion,
bool FoundElse) {
++NumSkipped;
assert(CurTokenLexer == 0 && CurPPLexer && "Lexing a macro, not a file?");
CurPPLexer->pushConditionalLevel(IfTokenLoc, /*isSkipping*/false,
FoundNonSkipPortion, FoundElse);
if (CurPTHLexer) {
PTHSkipExcludedConditionalBlock();
return;
}
// Enter raw mode to disable identifier lookup (and thus macro expansion),
// disabling warnings, etc.
CurPPLexer->LexingRawMode = true;
Token Tok;
while (1) {
CurLexer->Lex(Tok);
if (Tok.is(tok::code_completion)) {
if (CodeComplete)
CodeComplete->CodeCompleteInConditionalExclusion();
continue;
}
// If this is the end of the buffer, we have an error.
if (Tok.is(tok::eof)) {
// Emit errors for each unterminated conditional on the stack, including
// the current one.
while (!CurPPLexer->ConditionalStack.empty()) {
if (!isCodeCompletionFile(Tok.getLocation()))
Diag(CurPPLexer->ConditionalStack.back().IfLoc,
diag::err_pp_unterminated_conditional);
CurPPLexer->ConditionalStack.pop_back();
}
// Just return and let the caller lex after this #include.
break;
}
// If this token is not a preprocessor directive, just skip it.
if (Tok.isNot(tok::hash) || !Tok.isAtStartOfLine())
continue;
// We just parsed a # character at the start of a line, so we're in
// directive mode. Tell the lexer this so any newlines we see will be
// converted into an EOM token (this terminates the macro).
CurPPLexer->ParsingPreprocessorDirective = true;
if (CurLexer) CurLexer->SetCommentRetentionState(false);
// Read the next token, the directive flavor.
LexUnexpandedToken(Tok);
// If this isn't an identifier directive (e.g. is "# 1\n" or "#\n", or
// something bogus), skip it.
if (Tok.isNot(tok::identifier)) {
CurPPLexer->ParsingPreprocessorDirective = false;
// Restore comment saving mode.
if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments);
continue;
}
// If the first letter isn't i or e, it isn't intesting to us. We know that
// this is safe in the face of spelling differences, because there is no way
// to spell an i/e in a strange way that is another letter. Skipping this
// allows us to avoid looking up the identifier info for #define/#undef and
// other common directives.
bool Invalid = false;
const char *RawCharData = SourceMgr.getCharacterData(Tok.getLocation(),
&Invalid);
if (Invalid)
return;
char FirstChar = RawCharData[0];
if (FirstChar >= 'a' && FirstChar <= 'z' &&
FirstChar != 'i' && FirstChar != 'e') {
CurPPLexer->ParsingPreprocessorDirective = false;
// Restore comment saving mode.
if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments);
continue;
}
// Get the identifier name without trigraphs or embedded newlines. Note
// that we can't use Tok.getIdentifierInfo() because its lookup is disabled
// when skipping.
char DirectiveBuf[20];
llvm::StringRef Directive;
if (!Tok.needsCleaning() && Tok.getLength() < 20) {
Directive = llvm::StringRef(RawCharData, Tok.getLength());
} else {
std::string DirectiveStr = getSpelling(Tok);
unsigned IdLen = DirectiveStr.size();
if (IdLen >= 20) {
CurPPLexer->ParsingPreprocessorDirective = false;
// Restore comment saving mode.
if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments);
continue;
}
memcpy(DirectiveBuf, &DirectiveStr[0], IdLen);
Directive = llvm::StringRef(DirectiveBuf, IdLen);
}
if (Directive.startswith("if")) {
llvm::StringRef Sub = Directive.substr(2);
if (Sub.empty() || // "if"
Sub == "def" || // "ifdef"
Sub == "ndef") { // "ifndef"
// We know the entire #if/#ifdef/#ifndef block will be skipped, don't
// bother parsing the condition.
DiscardUntilEndOfDirective();
CurPPLexer->pushConditionalLevel(Tok.getLocation(), /*wasskipping*/true,
/*foundnonskip*/false,
/*fnddelse*/false);
}
} else if (Directive[0] == 'e') {
llvm::StringRef Sub = Directive.substr(1);
if (Sub == "ndif") { // "endif"
CheckEndOfDirective("endif");
PPConditionalInfo CondInfo;
CondInfo.WasSkipping = true; // Silence bogus warning.
bool InCond = CurPPLexer->popConditionalLevel(CondInfo);
InCond = InCond; // Silence warning in no-asserts mode.
assert(!InCond && "Can't be skipping if not in a conditional!");
// If we popped the outermost skipping block, we're done skipping!
if (!CondInfo.WasSkipping)
break;
} else if (Sub == "lse") { // "else".
// #else directive in a skipping conditional. If not in some other
// skipping conditional, and if #else hasn't already been seen, enter it
// as a non-skipping conditional.
DiscardUntilEndOfDirective(); // C99 6.10p4.
PPConditionalInfo &CondInfo = CurPPLexer->peekConditionalLevel();
// If this is a #else with a #else before it, report the error.
if (CondInfo.FoundElse) Diag(Tok, diag::pp_err_else_after_else);
// Note that we've seen a #else in this conditional.
CondInfo.FoundElse = true;
// If the conditional is at the top level, and the #if block wasn't
// entered, enter the #else block now.
if (!CondInfo.WasSkipping && !CondInfo.FoundNonSkip) {
CondInfo.FoundNonSkip = true;
break;
}
} else if (Sub == "lif") { // "elif".
PPConditionalInfo &CondInfo = CurPPLexer->peekConditionalLevel();
bool ShouldEnter;
// If this is in a skipping block or if we're already handled this #if
// block, don't bother parsing the condition.
if (CondInfo.WasSkipping || CondInfo.FoundNonSkip) {
DiscardUntilEndOfDirective();
ShouldEnter = false;
} else {
// Restore the value of LexingRawMode so that identifiers are
// looked up, etc, inside the #elif expression.
assert(CurPPLexer->LexingRawMode && "We have to be skipping here!");
CurPPLexer->LexingRawMode = false;
IdentifierInfo *IfNDefMacro = 0;
ShouldEnter = EvaluateDirectiveExpression(IfNDefMacro);
CurPPLexer->LexingRawMode = true;
}
// If this is a #elif with a #else before it, report the error.
if (CondInfo.FoundElse) Diag(Tok, diag::pp_err_elif_after_else);
// If this condition is true, enter it!
if (ShouldEnter) {
CondInfo.FoundNonSkip = true;
break;
}
}
}
CurPPLexer->ParsingPreprocessorDirective = false;
// Restore comment saving mode.
if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments);
}
// Finally, if we are out of the conditional (saw an #endif or ran off the end
// of the file, just stop skipping and return to lexing whatever came after
// the #if block.
CurPPLexer->LexingRawMode = false;
}
void Preprocessor::PTHSkipExcludedConditionalBlock() {
while (1) {
assert(CurPTHLexer);
assert(CurPTHLexer->LexingRawMode == false);
// Skip to the next '#else', '#elif', or #endif.
if (CurPTHLexer->SkipBlock()) {
// We have reached an #endif. Both the '#' and 'endif' tokens
// have been consumed by the PTHLexer. Just pop off the condition level.
PPConditionalInfo CondInfo;
bool InCond = CurPTHLexer->popConditionalLevel(CondInfo);
InCond = InCond; // Silence warning in no-asserts mode.
assert(!InCond && "Can't be skipping if not in a conditional!");
break;
}
// We have reached a '#else' or '#elif'. Lex the next token to get
// the directive flavor.
Token Tok;
LexUnexpandedToken(Tok);
// We can actually look up the IdentifierInfo here since we aren't in
// raw mode.
tok::PPKeywordKind K = Tok.getIdentifierInfo()->getPPKeywordID();
if (K == tok::pp_else) {
// #else: Enter the else condition. We aren't in a nested condition
// since we skip those. We're always in the one matching the last
// blocked we skipped.
PPConditionalInfo &CondInfo = CurPTHLexer->peekConditionalLevel();
// Note that we've seen a #else in this conditional.
CondInfo.FoundElse = true;
// If the #if block wasn't entered then enter the #else block now.
if (!CondInfo.FoundNonSkip) {
CondInfo.FoundNonSkip = true;
// Scan until the eom token.
CurPTHLexer->ParsingPreprocessorDirective = true;
DiscardUntilEndOfDirective();
CurPTHLexer->ParsingPreprocessorDirective = false;
break;
}
// Otherwise skip this block.
continue;
}
assert(K == tok::pp_elif);
PPConditionalInfo &CondInfo = CurPTHLexer->peekConditionalLevel();
// If this is a #elif with a #else before it, report the error.
if (CondInfo.FoundElse)
Diag(Tok, diag::pp_err_elif_after_else);
// If this is in a skipping block or if we're already handled this #if
// block, don't bother parsing the condition. We just skip this block.
if (CondInfo.FoundNonSkip)
continue;
// Evaluate the condition of the #elif.
IdentifierInfo *IfNDefMacro = 0;
CurPTHLexer->ParsingPreprocessorDirective = true;
bool ShouldEnter = EvaluateDirectiveExpression(IfNDefMacro);
CurPTHLexer->ParsingPreprocessorDirective = false;
// If this condition is true, enter it!
if (ShouldEnter) {
CondInfo.FoundNonSkip = true;
break;
}
// Otherwise, skip this block and go to the next one.
continue;
}
}
/// LookupFile - Given a "foo" or <foo> reference, look up the indicated file,
/// return null on failure. isAngled indicates whether the file reference is
/// for system #include's or not (i.e. using <> instead of "").
const FileEntry *Preprocessor::LookupFile(llvm::StringRef Filename,
bool isAngled,
const DirectoryLookup *FromDir,
const DirectoryLookup *&CurDir) {
// If the header lookup mechanism may be relative to the current file, pass in
// info about where the current file is.
const FileEntry *CurFileEnt = 0;
if (!FromDir) {
FileID FID = getCurrentFileLexer()->getFileID();
CurFileEnt = SourceMgr.getFileEntryForID(FID);
// If there is no file entry associated with this file, it must be the
// predefines buffer. Any other file is not lexed with a normal lexer, so
// it won't be scanned for preprocessor directives. If we have the
// predefines buffer, resolve #include references (which come from the
// -include command line argument) as if they came from the main file, this
// affects file lookup etc.
if (CurFileEnt == 0) {
FID = SourceMgr.getMainFileID();
CurFileEnt = SourceMgr.getFileEntryForID(FID);
}
}
// Do a standard file entry lookup.
CurDir = CurDirLookup;
const FileEntry *FE =
HeaderInfo.LookupFile(Filename, isAngled, FromDir, CurDir, CurFileEnt);
if (FE) return FE;
// Otherwise, see if this is a subframework header. If so, this is relative
// to one of the headers on the #include stack. Walk the list of the current
// headers on the #include stack and pass them to HeaderInfo.
if (IsFileLexer()) {
if ((CurFileEnt = SourceMgr.getFileEntryForID(CurPPLexer->getFileID())))
if ((FE = HeaderInfo.LookupSubframeworkHeader(Filename, CurFileEnt)))
return FE;
}
for (unsigned i = 0, e = IncludeMacroStack.size(); i != e; ++i) {
IncludeStackInfo &ISEntry = IncludeMacroStack[e-i-1];
if (IsFileLexer(ISEntry)) {
if ((CurFileEnt =
SourceMgr.getFileEntryForID(ISEntry.ThePPLexer->getFileID())))
if ((FE = HeaderInfo.LookupSubframeworkHeader(Filename, CurFileEnt)))
return FE;
}
}
// Otherwise, we really couldn't find the file.
return 0;
}
//===----------------------------------------------------------------------===//
// Preprocessor Directive Handling.
//===----------------------------------------------------------------------===//
/// HandleDirective - This callback is invoked when the lexer sees a # token
/// at the start of a line. This consumes the directive, modifies the
/// lexer/preprocessor state, and advances the lexer(s) so that the next token
/// read is the correct one.
void Preprocessor::HandleDirective(Token &Result) {
// FIXME: Traditional: # with whitespace before it not recognized by K&R?
// We just parsed a # character at the start of a line, so we're in directive
// mode. Tell the lexer this so any newlines we see will be converted into an
// EOM token (which terminates the directive).
CurPPLexer->ParsingPreprocessorDirective = true;
++NumDirectives;
// We are about to read a token. For the multiple-include optimization FA to
// work, we have to remember if we had read any tokens *before* this
// pp-directive.
bool ReadAnyTokensBeforeDirective =CurPPLexer->MIOpt.getHasReadAnyTokensVal();
// Save the '#' token in case we need to return it later.
Token SavedHash = Result;
// Read the next token, the directive flavor. This isn't expanded due to
// C99 6.10.3p8.
LexUnexpandedToken(Result);
// C99 6.10.3p11: Is this preprocessor directive in macro invocation? e.g.:
// #define A(x) #x
// A(abc
// #warning blah
// def)
// If so, the user is relying on non-portable behavior, emit a diagnostic.
if (InMacroArgs)
Diag(Result, diag::ext_embedded_directive);
TryAgain:
switch (Result.getKind()) {
case tok::eom:
return; // null directive.
case tok::comment:
// Handle stuff like "# /*foo*/ define X" in -E -C mode.
LexUnexpandedToken(Result);
goto TryAgain;
case tok::code_completion:
if (CodeComplete)
CodeComplete->CodeCompleteDirective(
CurPPLexer->getConditionalStackDepth() > 0);
return;
case tok::numeric_constant: // # 7 GNU line marker directive.
if (getLangOptions().AsmPreprocessor)
break; // # 4 is not a preprocessor directive in .S files.
return HandleDigitDirective(Result);
default:
IdentifierInfo *II = Result.getIdentifierInfo();
if (II == 0) break; // Not an identifier.
// Ask what the preprocessor keyword ID is.
switch (II->getPPKeywordID()) {
default: break;
// C99 6.10.1 - Conditional Inclusion.
case tok::pp_if:
return HandleIfDirective(Result, ReadAnyTokensBeforeDirective);
case tok::pp_ifdef:
return HandleIfdefDirective(Result, false, true/*not valid for miopt*/);
case tok::pp_ifndef:
return HandleIfdefDirective(Result, true, ReadAnyTokensBeforeDirective);
case tok::pp_elif:
return HandleElifDirective(Result);
case tok::pp_else:
return HandleElseDirective(Result);
case tok::pp_endif:
return HandleEndifDirective(Result);
// C99 6.10.2 - Source File Inclusion.
case tok::pp_include:
return HandleIncludeDirective(Result); // Handle #include.
case tok::pp___include_macros:
return HandleIncludeMacrosDirective(Result); // Handle -imacros.
// C99 6.10.3 - Macro Replacement.
case tok::pp_define:
return HandleDefineDirective(Result);
case tok::pp_undef:
return HandleUndefDirective(Result);
// C99 6.10.4 - Line Control.
case tok::pp_line:
return HandleLineDirective(Result);
// C99 6.10.5 - Error Directive.
case tok::pp_error:
return HandleUserDiagnosticDirective(Result, false);
// C99 6.10.6 - Pragma Directive.
case tok::pp_pragma:
return HandlePragmaDirective(PIK_HashPragma);
// GNU Extensions.
case tok::pp_import:
return HandleImportDirective(Result);
case tok::pp_include_next:
return HandleIncludeNextDirective(Result);
case tok::pp_warning:
Diag(Result, diag::ext_pp_warning_directive);
return HandleUserDiagnosticDirective(Result, true);
case tok::pp_ident:
return HandleIdentSCCSDirective(Result);
case tok::pp_sccs:
return HandleIdentSCCSDirective(Result);
case tok::pp_assert:
//isExtension = true; // FIXME: implement #assert
break;
case tok::pp_unassert:
//isExtension = true; // FIXME: implement #unassert
break;
}
break;
}
// If this is a .S file, treat unknown # directives as non-preprocessor
// directives. This is important because # may be a comment or introduce
// various pseudo-ops. Just return the # token and push back the following
// token to be lexed next time.
if (getLangOptions().AsmPreprocessor) {
Token *Toks = new Token[2];
// Return the # and the token after it.
Toks[0] = SavedHash;
Toks[1] = Result;
// Enter this token stream so that we re-lex the tokens. Make sure to
// enable macro expansion, in case the token after the # is an identifier
// that is expanded.
EnterTokenStream(Toks, 2, false, true);
return;
}
// If we reached here, the preprocessing token is not valid!
Diag(Result, diag::err_pp_invalid_directive);
// Read the rest of the PP line.
DiscardUntilEndOfDirective();
// Okay, we're done parsing the directive.
}
/// GetLineValue - Convert a numeric token into an unsigned value, emitting
/// Diagnostic DiagID if it is invalid, and returning the value in Val.
static bool GetLineValue(Token &DigitTok, unsigned &Val,
unsigned DiagID, Preprocessor &PP) {
if (DigitTok.isNot(tok::numeric_constant)) {
PP.Diag(DigitTok, DiagID);
if (DigitTok.isNot(tok::eom))
PP.DiscardUntilEndOfDirective();
return true;
}
llvm::SmallString<64> IntegerBuffer;
IntegerBuffer.resize(DigitTok.getLength());
const char *DigitTokBegin = &IntegerBuffer[0];
bool Invalid = false;
unsigned ActualLength = PP.getSpelling(DigitTok, DigitTokBegin, &Invalid);
if (Invalid)
return true;
// Verify that we have a simple digit-sequence, and compute the value. This
// is always a simple digit string computed in decimal, so we do this manually
// here.
Val = 0;
for (unsigned i = 0; i != ActualLength; ++i) {
if (!isdigit(DigitTokBegin[i])) {
PP.Diag(PP.AdvanceToTokenCharacter(DigitTok.getLocation(), i),
diag::err_pp_line_digit_sequence);
PP.DiscardUntilEndOfDirective();
return true;
}
unsigned NextVal = Val*10+(DigitTokBegin[i]-'0');
if (NextVal < Val) { // overflow.
PP.Diag(DigitTok, DiagID);
PP.DiscardUntilEndOfDirective();
return true;
}
Val = NextVal;
}
// Reject 0, this is needed both by #line numbers and flags.
if (Val == 0) {
PP.Diag(DigitTok, DiagID);
PP.DiscardUntilEndOfDirective();
return true;
}
if (DigitTokBegin[0] == '0')
PP.Diag(DigitTok.getLocation(), diag::warn_pp_line_decimal);
return false;
}
/// HandleLineDirective - Handle #line directive: C99 6.10.4. The two
/// acceptable forms are:
/// # line digit-sequence
/// # line digit-sequence "s-char-sequence"
void Preprocessor::HandleLineDirective(Token &Tok) {
// Read the line # and string argument. Per C99 6.10.4p5, these tokens are
// expanded.
Token DigitTok;
Lex(DigitTok);
// Validate the number and convert it to an unsigned.
unsigned LineNo;
if (GetLineValue(DigitTok, LineNo, diag::err_pp_line_requires_integer,*this))
return;
// Enforce C99 6.10.4p3: "The digit sequence shall not specify ... a
// number greater than 2147483647". C90 requires that the line # be <= 32767.
unsigned LineLimit = Features.C99 ? 2147483648U : 32768U;
if (LineNo >= LineLimit)
Diag(DigitTok, diag::ext_pp_line_too_big) << LineLimit;
int FilenameID = -1;
Token StrTok;
Lex(StrTok);
// If the StrTok is "eom", then it wasn't present. Otherwise, it must be a
// string followed by eom.
if (StrTok.is(tok::eom))
; // ok
else if (StrTok.isNot(tok::string_literal)) {
Diag(StrTok, diag::err_pp_line_invalid_filename);
DiscardUntilEndOfDirective();
return;
} else {
// Parse and validate the string, converting it into a unique ID.
StringLiteralParser Literal(&StrTok, 1, *this);
assert(!Literal.AnyWide && "Didn't allow wide strings in");
if (Literal.hadError)
return DiscardUntilEndOfDirective();
if (Literal.Pascal) {
Diag(StrTok, diag::err_pp_linemarker_invalid_filename);
return DiscardUntilEndOfDirective();
}
FilenameID = SourceMgr.getLineTableFilenameID(Literal.GetString(),
Literal.GetStringLength());
// Verify that there is nothing after the string, other than EOM. Because
// of C99 6.10.4p5, macros that expand to empty tokens are ok.
CheckEndOfDirective("line", true);
}
SourceMgr.AddLineNote(DigitTok.getLocation(), LineNo, FilenameID);
if (Callbacks)
Callbacks->FileChanged(CurPPLexer->getSourceLocation(),
PPCallbacks::RenameFile,
SrcMgr::C_User);
}
/// ReadLineMarkerFlags - Parse and validate any flags at the end of a GNU line
/// marker directive.
static bool ReadLineMarkerFlags(bool &IsFileEntry, bool &IsFileExit,
bool &IsSystemHeader, bool &IsExternCHeader,
Preprocessor &PP) {
unsigned FlagVal;
Token FlagTok;
PP.Lex(FlagTok);
if (FlagTok.is(tok::eom)) return false;
if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag, PP))
return true;
if (FlagVal == 1) {
IsFileEntry = true;
PP.Lex(FlagTok);
if (FlagTok.is(tok::eom)) return false;
if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag,PP))
return true;
} else if (FlagVal == 2) {
IsFileExit = true;
SourceManager &SM = PP.getSourceManager();
// If we are leaving the current presumed file, check to make sure the
// presumed include stack isn't empty!
FileID CurFileID =
SM.getDecomposedInstantiationLoc(FlagTok.getLocation()).first;
PresumedLoc PLoc = SM.getPresumedLoc(FlagTok.getLocation());
// If there is no include loc (main file) or if the include loc is in a
// different physical file, then we aren't in a "1" line marker flag region.
SourceLocation IncLoc = PLoc.getIncludeLoc();
if (IncLoc.isInvalid() ||
SM.getDecomposedInstantiationLoc(IncLoc).first != CurFileID) {
PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_pop);
PP.DiscardUntilEndOfDirective();
return true;
}
PP.Lex(FlagTok);
if (FlagTok.is(tok::eom)) return false;
if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag,PP))
return true;
}
// We must have 3 if there are still flags.
if (FlagVal != 3) {
PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_flag);
PP.DiscardUntilEndOfDirective();
return true;
}
IsSystemHeader = true;
PP.Lex(FlagTok);
if (FlagTok.is(tok::eom)) return false;
if (GetLineValue(FlagTok, FlagVal, diag::err_pp_linemarker_invalid_flag, PP))
return true;
// We must have 4 if there is yet another flag.
if (FlagVal != 4) {
PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_flag);
PP.DiscardUntilEndOfDirective();
return true;
}
IsExternCHeader = true;
PP.Lex(FlagTok);
if (FlagTok.is(tok::eom)) return false;
// There are no more valid flags here.
PP.Diag(FlagTok, diag::err_pp_linemarker_invalid_flag);
PP.DiscardUntilEndOfDirective();
return true;
}
/// HandleDigitDirective - Handle a GNU line marker directive, whose syntax is
/// one of the following forms:
///
/// # 42
/// # 42 "file" ('1' | '2')?
/// # 42 "file" ('1' | '2')? '3' '4'?
///
void Preprocessor::HandleDigitDirective(Token &DigitTok) {
// Validate the number and convert it to an unsigned. GNU does not have a
// line # limit other than it fit in 32-bits.
unsigned LineNo;
if (GetLineValue(DigitTok, LineNo, diag::err_pp_linemarker_requires_integer,
*this))
return;
Token StrTok;
Lex(StrTok);
bool IsFileEntry = false, IsFileExit = false;
bool IsSystemHeader = false, IsExternCHeader = false;
int FilenameID = -1;
// If the StrTok is "eom", then it wasn't present. Otherwise, it must be a
// string followed by eom.
if (StrTok.is(tok::eom))
; // ok
else if (StrTok.isNot(tok::string_literal)) {
Diag(StrTok, diag::err_pp_linemarker_invalid_filename);
return DiscardUntilEndOfDirective();
} else {
// Parse and validate the string, converting it into a unique ID.
StringLiteralParser Literal(&StrTok, 1, *this);
assert(!Literal.AnyWide && "Didn't allow wide strings in");
if (Literal.hadError)
return DiscardUntilEndOfDirective();
if (Literal.Pascal) {
Diag(StrTok, diag::err_pp_linemarker_invalid_filename);
return DiscardUntilEndOfDirective();
}
FilenameID = SourceMgr.getLineTableFilenameID(Literal.GetString(),
Literal.GetStringLength());
// If a filename was present, read any flags that are present.
if (ReadLineMarkerFlags(IsFileEntry, IsFileExit,
IsSystemHeader, IsExternCHeader, *this))
return;
}
// Create a line note with this information.
SourceMgr.AddLineNote(DigitTok.getLocation(), LineNo, FilenameID,
IsFileEntry, IsFileExit,
IsSystemHeader, IsExternCHeader);
// If the preprocessor has callbacks installed, notify them of the #line
// change. This is used so that the line marker comes out in -E mode for
// example.
if (Callbacks) {
PPCallbacks::FileChangeReason Reason = PPCallbacks::RenameFile;
if (IsFileEntry)
Reason = PPCallbacks::EnterFile;
else if (IsFileExit)
Reason = PPCallbacks::ExitFile;
SrcMgr::CharacteristicKind FileKind = SrcMgr::C_User;
if (IsExternCHeader)
FileKind = SrcMgr::C_ExternCSystem;
else if (IsSystemHeader)
FileKind = SrcMgr::C_System;
Callbacks->FileChanged(CurPPLexer->getSourceLocation(), Reason, FileKind);
}
}
/// HandleUserDiagnosticDirective - Handle a #warning or #error directive.
///
void Preprocessor::HandleUserDiagnosticDirective(Token &Tok,
bool isWarning) {
// PTH doesn't emit #warning or #error directives.
if (CurPTHLexer)
return CurPTHLexer->DiscardToEndOfLine();
// Read the rest of the line raw. We do this because we don't want macros
// to be expanded and we don't require that the tokens be valid preprocessing
// tokens. For example, this is allowed: "#warning ` 'foo". GCC does
// collapse multiple consequtive white space between tokens, but this isn't
// specified by the standard.
std::string Message = CurLexer->ReadToEndOfLine();
if (isWarning)
Diag(Tok, diag::pp_hash_warning) << Message;
else
Diag(Tok, diag::err_pp_hash_error) << Message;
}
/// HandleIdentSCCSDirective - Handle a #ident/#sccs directive.
///
void Preprocessor::HandleIdentSCCSDirective(Token &Tok) {
// Yes, this directive is an extension.
Diag(Tok, diag::ext_pp_ident_directive);
// Read the string argument.
Token StrTok;
Lex(StrTok);
// If the token kind isn't a string, it's a malformed directive.
if (StrTok.isNot(tok::string_literal) &&
StrTok.isNot(tok::wide_string_literal)) {
Diag(StrTok, diag::err_pp_malformed_ident);
if (StrTok.isNot(tok::eom))
DiscardUntilEndOfDirective();
return;
}
// Verify that there is nothing after the string, other than EOM.
CheckEndOfDirective("ident");
if (Callbacks) {
bool Invalid = false;
std::string Str = getSpelling(StrTok, &Invalid);
if (!Invalid)
Callbacks->Ident(Tok.getLocation(), Str);
}
}
//===----------------------------------------------------------------------===//
// Preprocessor Include Directive Handling.
//===----------------------------------------------------------------------===//
/// GetIncludeFilenameSpelling - Turn the specified lexer token into a fully
/// checked and spelled filename, e.g. as an operand of #include. This returns
/// true if the input filename was in <>'s or false if it were in ""'s. The
/// caller is expected to provide a buffer that is large enough to hold the
/// spelling of the filename, but is also expected to handle the case when
/// this method decides to use a different buffer.
bool Preprocessor::GetIncludeFilenameSpelling(SourceLocation Loc,
llvm::StringRef &Buffer) {
// Get the text form of the filename.
assert(!Buffer.empty() && "Can't have tokens with empty spellings!");
// Make sure the filename is <x> or "x".
bool isAngled;
if (Buffer[0] == '<') {
if (Buffer.back() != '>') {
Diag(Loc, diag::err_pp_expects_filename);
Buffer = llvm::StringRef();
return true;
}
isAngled = true;
} else if (Buffer[0] == '"') {
if (Buffer.back() != '"') {
Diag(Loc, diag::err_pp_expects_filename);
Buffer = llvm::StringRef();
return true;
}
isAngled = false;
} else {
Diag(Loc, diag::err_pp_expects_filename);
Buffer = llvm::StringRef();
return true;
}
// Diagnose #include "" as invalid.
if (Buffer.size() <= 2) {
Diag(Loc, diag::err_pp_empty_filename);
Buffer = llvm::StringRef();
return true;
}
// Skip the brackets.
Buffer = Buffer.substr(1, Buffer.size()-2);
return isAngled;
}
/// ConcatenateIncludeName - Handle cases where the #include name is expanded
/// from a macro as multiple tokens, which need to be glued together. This
/// occurs for code like:
/// #define FOO <a/b.h>
/// #include FOO
/// because in this case, "<a/b.h>" is returned as 7 tokens, not one.
///
/// This code concatenates and consumes tokens up to the '>' token. It returns
/// false if the > was found, otherwise it returns true if it finds and consumes
/// the EOM marker.
bool Preprocessor::ConcatenateIncludeName(
llvm::SmallString<128> &FilenameBuffer) {
Token CurTok;
Lex(CurTok);
while (CurTok.isNot(tok::eom)) {
// Append the spelling of this token to the buffer. If there was a space
// before it, add it now.
if (CurTok.hasLeadingSpace())
FilenameBuffer.push_back(' ');
// Get the spelling of the token, directly into FilenameBuffer if possible.
unsigned PreAppendSize = FilenameBuffer.size();
FilenameBuffer.resize(PreAppendSize+CurTok.getLength());
const char *BufPtr = &FilenameBuffer[PreAppendSize];
unsigned ActualLen = getSpelling(CurTok, BufPtr);
// If the token was spelled somewhere else, copy it into FilenameBuffer.
if (BufPtr != &FilenameBuffer[PreAppendSize])
memcpy(&FilenameBuffer[PreAppendSize], BufPtr, ActualLen);
// Resize FilenameBuffer to the correct size.
if (CurTok.getLength() != ActualLen)
FilenameBuffer.resize(PreAppendSize+ActualLen);
// If we found the '>' marker, return success.
if (CurTok.is(tok::greater))
return false;
Lex(CurTok);
}
// If we hit the eom marker, emit an error and return true so that the caller
// knows the EOM has been read.
Diag(CurTok.getLocation(), diag::err_pp_expects_filename);
return true;
}
/// HandleIncludeDirective - The "#include" tokens have just been read, read the
/// file to be included from the lexer, then include it! This is a common
/// routine with functionality shared between #include, #include_next and
/// #import. LookupFrom is set when this is a #include_next directive, it
/// specifies the file to start searching from.
void Preprocessor::HandleIncludeDirective(Token &IncludeTok,
const DirectoryLookup *LookupFrom,
bool isImport) {
Token FilenameTok;
CurPPLexer->LexIncludeFilename(FilenameTok);
// Reserve a buffer to get the spelling.
llvm::SmallString<128> FilenameBuffer;
llvm::StringRef Filename;
switch (FilenameTok.getKind()) {
case tok::eom:
// If the token kind is EOM, the error has already been diagnosed.
return;
case tok::angle_string_literal:
case tok::string_literal:
Filename = getSpelling(FilenameTok, FilenameBuffer);
break;
case tok::less:
// This could be a <foo/bar.h> file coming from a macro expansion. In this
// case, glue the tokens together into FilenameBuffer and interpret those.
FilenameBuffer.push_back('<');
if (ConcatenateIncludeName(FilenameBuffer))
return; // Found <eom> but no ">"? Diagnostic already emitted.
Filename = FilenameBuffer.str();
break;
default:
Diag(FilenameTok.getLocation(), diag::err_pp_expects_filename);
DiscardUntilEndOfDirective();
return;
}
bool isAngled =
GetIncludeFilenameSpelling(FilenameTok.getLocation(), Filename);
// If GetIncludeFilenameSpelling set the start ptr to null, there was an
// error.
if (Filename.empty()) {
DiscardUntilEndOfDirective();
return;
}
// Verify that there is nothing after the filename, other than EOM. Note that
// we allow macros that expand to nothing after the filename, because this
// falls into the category of "#include pp-tokens new-line" specified in
// C99 6.10.2p4.
CheckEndOfDirective(IncludeTok.getIdentifierInfo()->getNameStart(), true);
// Check that we don't have infinite #include recursion.
if (IncludeMacroStack.size() == MaxAllowedIncludeStackDepth-1) {
Diag(FilenameTok, diag::err_pp_include_too_deep);
return;
}
// Search include directories.
const DirectoryLookup *CurDir;
const FileEntry *File = LookupFile(Filename, isAngled, LookupFrom, CurDir);
if (File == 0) {
Diag(FilenameTok, diag::err_pp_file_not_found) << Filename;
return;
}
// The #included file will be considered to be a system header if either it is
// in a system include directory, or if the #includer is a system include
// header.
SrcMgr::CharacteristicKind FileCharacter =
std::max(HeaderInfo.getFileDirFlavor(File),
SourceMgr.getFileCharacteristic(FilenameTok.getLocation()));
// Ask HeaderInfo if we should enter this #include file. If not, #including
// this file will have no effect.
if (!HeaderInfo.ShouldEnterIncludeFile(File, isImport)) {
if (Callbacks)
Callbacks->FileSkipped(*File, FilenameTok, FileCharacter);
return;
}
// Look up the file, create a File ID for it.
FileID FID = SourceMgr.createFileID(File, FilenameTok.getLocation(),
FileCharacter);
if (FID.isInvalid()) {
Diag(FilenameTok, diag::err_pp_file_not_found) << Filename;
return;
}
// Finally, if all is good, enter the new file!
EnterSourceFile(FID, CurDir, FilenameTok.getLocation());
}
/// HandleIncludeNextDirective - Implements #include_next.
///
void Preprocessor::HandleIncludeNextDirective(Token &IncludeNextTok) {
Diag(IncludeNextTok, diag::ext_pp_include_next_directive);
// #include_next is like #include, except that we start searching after
// the current found directory. If we can't do this, issue a
// diagnostic.
const DirectoryLookup *Lookup = CurDirLookup;
if (isInPrimaryFile()) {
Lookup = 0;
Diag(IncludeNextTok, diag::pp_include_next_in_primary);
} else if (Lookup == 0) {
Diag(IncludeNextTok, diag::pp_include_next_absolute_path);
} else {
// Start looking up in the next directory.
++Lookup;
}
return HandleIncludeDirective(IncludeNextTok, Lookup);
}
/// HandleImportDirective - Implements #import.
///
void Preprocessor::HandleImportDirective(Token &ImportTok) {
if (!Features.ObjC1) // #import is standard for ObjC.
Diag(ImportTok, diag::ext_pp_import_directive);
return HandleIncludeDirective(ImportTok, 0, true);
}
/// HandleIncludeMacrosDirective - The -imacros command line option turns into a
/// pseudo directive in the predefines buffer. This handles it by sucking all
/// tokens through the preprocessor and discarding them (only keeping the side
/// effects on the preprocessor).
void Preprocessor::HandleIncludeMacrosDirective(Token &IncludeMacrosTok) {
// This directive should only occur in the predefines buffer. If not, emit an
// error and reject it.
SourceLocation Loc = IncludeMacrosTok.getLocation();
if (strcmp(SourceMgr.getBufferName(Loc), "<built-in>") != 0) {
Diag(IncludeMacrosTok.getLocation(),
diag::pp_include_macros_out_of_predefines);
DiscardUntilEndOfDirective();
return;
}
// Treat this as a normal #include for checking purposes. If this is
// successful, it will push a new lexer onto the include stack.
HandleIncludeDirective(IncludeMacrosTok, 0, false);
Token TmpTok;
do {
Lex(TmpTok);
assert(TmpTok.isNot(tok::eof) && "Didn't find end of -imacros!");
} while (TmpTok.isNot(tok::hashhash));
}
//===----------------------------------------------------------------------===//
// Preprocessor Macro Directive Handling.
//===----------------------------------------------------------------------===//
/// ReadMacroDefinitionArgList - The ( starting an argument list of a macro
/// definition has just been read. Lex the rest of the arguments and the
/// closing ), updating MI with what we learn. Return true if an error occurs
/// parsing the arg list.
bool Preprocessor::ReadMacroDefinitionArgList(MacroInfo *MI) {
llvm::SmallVector<IdentifierInfo*, 32> Arguments;
Token Tok;
while (1) {
LexUnexpandedToken(Tok);
switch (Tok.getKind()) {
case tok::r_paren:
// Found the end of the argument list.
if (Arguments.empty()) // #define FOO()
return false;
// Otherwise we have #define FOO(A,)
Diag(Tok, diag::err_pp_expected_ident_in_arg_list);
return true;
case tok::ellipsis: // #define X(... -> C99 varargs
// Warn if use of C99 feature in non-C99 mode.
if (!Features.C99) Diag(Tok, diag::ext_variadic_macro);
// Lex the token after the identifier.
LexUnexpandedToken(Tok);
if (Tok.isNot(tok::r_paren)) {
Diag(Tok, diag::err_pp_missing_rparen_in_macro_def);
return true;
}
// Add the __VA_ARGS__ identifier as an argument.
Arguments.push_back(Ident__VA_ARGS__);
MI->setIsC99Varargs();
MI->setArgumentList(&Arguments[0], Arguments.size(), BP);
return false;
case tok::eom: // #define X(
Diag(Tok, diag::err_pp_missing_rparen_in_macro_def);
return true;
default:
// Handle keywords and identifiers here to accept things like
// #define Foo(for) for.
IdentifierInfo *II = Tok.getIdentifierInfo();
if (II == 0) {
// #define X(1
Diag(Tok, diag::err_pp_invalid_tok_in_arg_list);
return true;
}
// If this is already used as an argument, it is used multiple times (e.g.
// #define X(A,A.
if (std::find(Arguments.begin(), Arguments.end(), II) !=
Arguments.end()) { // C99 6.10.3p6
Diag(Tok, diag::err_pp_duplicate_name_in_arg_list) << II;
return true;
}
// Add the argument to the macro info.
Arguments.push_back(II);
// Lex the token after the identifier.
LexUnexpandedToken(Tok);
switch (Tok.getKind()) {
default: // #define X(A B
Diag(Tok, diag::err_pp_expected_comma_in_arg_list);
return true;
case tok::r_paren: // #define X(A)
MI->setArgumentList(&Arguments[0], Arguments.size(), BP);
return false;
case tok::comma: // #define X(A,
break;
case tok::ellipsis: // #define X(A... -> GCC extension
// Diagnose extension.
Diag(Tok, diag::ext_named_variadic_macro);
// Lex the token after the identifier.
LexUnexpandedToken(Tok);
if (Tok.isNot(tok::r_paren)) {
Diag(Tok, diag::err_pp_missing_rparen_in_macro_def);
return true;
}
MI->setIsGNUVarargs();
MI->setArgumentList(&Arguments[0], Arguments.size(), BP);
return false;
}
}
}
}
/// HandleDefineDirective - Implements #define. This consumes the entire macro
/// line then lets the caller lex the next real token.
void Preprocessor::HandleDefineDirective(Token &DefineTok) {
++NumDefined;
Token MacroNameTok;
ReadMacroName(MacroNameTok, 1);
// Error reading macro name? If so, diagnostic already issued.
if (MacroNameTok.is(tok::eom))
return;
Token LastTok = MacroNameTok;
// If we are supposed to keep comments in #defines, reenable comment saving
// mode.
if (CurLexer) CurLexer->SetCommentRetentionState(KeepMacroComments);
// Create the new macro.
MacroInfo *MI = AllocateMacroInfo(MacroNameTok.getLocation());
Token Tok;
LexUnexpandedToken(Tok);
// If this is a function-like macro definition, parse the argument list,
// marking each of the identifiers as being used as macro arguments. Also,
// check other constraints on the first token of the macro body.
if (Tok.is(tok::eom)) {
// If there is no body to this macro, we have no special handling here.
} else if (Tok.hasLeadingSpace()) {
// This is a normal token with leading space. Clear the leading space
// marker on the first token to get proper expansion.
Tok.clearFlag(Token::LeadingSpace);
} else if (Tok.is(tok::l_paren)) {
// This is a function-like macro definition. Read the argument list.
MI->setIsFunctionLike();
if (ReadMacroDefinitionArgList(MI)) {
// Forget about MI.
ReleaseMacroInfo(MI);
// Throw away the rest of the line.
if (CurPPLexer->ParsingPreprocessorDirective)
DiscardUntilEndOfDirective();
return;
}
// If this is a definition of a variadic C99 function-like macro, not using
// the GNU named varargs extension, enabled __VA_ARGS__.
// "Poison" __VA_ARGS__, which can only appear in the expansion of a macro.
// This gets unpoisoned where it is allowed.
assert(Ident__VA_ARGS__->isPoisoned() && "__VA_ARGS__ should be poisoned!");
if (MI->isC99Varargs())
Ident__VA_ARGS__->setIsPoisoned(false);
// Read the first token after the arg list for down below.
LexUnexpandedToken(Tok);
} else if (Features.C99) {
// C99 requires whitespace between the macro definition and the body. Emit
// a diagnostic for something like "#define X+".
Diag(Tok, diag::ext_c99_whitespace_required_after_macro_name);
} else {
// C90 6.8 TC1 says: "In the definition of an object-like macro, if the
// first character of a replacement list is not a character required by
// subclause 5.2.1, then there shall be white-space separation between the
// identifier and the replacement list.". 5.2.1 lists this set:
// "A-Za-z0-9!"#%&'()*+,_./:;<=>?[\]^_{|}~" as well as whitespace, which
// is irrelevant here.
bool isInvalid = false;
if (Tok.is(tok::at)) // @ is not in the list above.
isInvalid = true;
else if (Tok.is(tok::unknown)) {
// If we have an unknown token, it is something strange like "`". Since
// all of valid characters would have lexed into a single character
// token of some sort, we know this is not a valid case.
isInvalid = true;
}
if (isInvalid)
Diag(Tok, diag::ext_missing_whitespace_after_macro_name);
else
Diag(Tok, diag::warn_missing_whitespace_after_macro_name);
}
if (!Tok.is(tok::eom))
LastTok = Tok;
// Read the rest of the macro body.
if (MI->isObjectLike()) {
// Object-like macros are very simple, just read their body.
while (Tok.isNot(tok::eom)) {
LastTok = Tok;
MI->AddTokenToBody(Tok);
// Get the next token of the macro.
LexUnexpandedToken(Tok);
}
} else {
// Otherwise, read the body of a function-like macro. While we are at it,
// check C99 6.10.3.2p1: ensure that # operators are followed by macro
// parameters in function-like macro expansions.
while (Tok.isNot(tok::eom)) {
LastTok = Tok;
if (Tok.isNot(tok::hash)) {
MI->AddTokenToBody(Tok);
// Get the next token of the macro.
LexUnexpandedToken(Tok);
continue;
}
// Get the next token of the macro.
LexUnexpandedToken(Tok);
// Check for a valid macro arg identifier.
if (Tok.getIdentifierInfo() == 0 ||
MI->getArgumentNum(Tok.getIdentifierInfo()) == -1) {
// If this is assembler-with-cpp mode, we accept random gibberish after
// the '#' because '#' is often a comment character. However, change
// the kind of the token to tok::unknown so that the preprocessor isn't
// confused.
if (getLangOptions().AsmPreprocessor && Tok.isNot(tok::eom)) {
LastTok.setKind(tok::unknown);
} else {
Diag(Tok, diag::err_pp_stringize_not_parameter);
ReleaseMacroInfo(MI);
// Disable __VA_ARGS__ again.
Ident__VA_ARGS__->setIsPoisoned(true);
return;
}
}
// Things look ok, add the '#' and param name tokens to the macro.
MI->AddTokenToBody(LastTok);
MI->AddTokenToBody(Tok);
LastTok = Tok;
// Get the next token of the macro.
LexUnexpandedToken(Tok);
}
}
// Disable __VA_ARGS__ again.
Ident__VA_ARGS__->setIsPoisoned(true);
// Check that there is no paste (##) operator at the begining or end of the
// replacement list.
unsigned NumTokens = MI->getNumTokens();
if (NumTokens != 0) {
if (MI->getReplacementToken(0).is(tok::hashhash)) {
Diag(MI->getReplacementToken(0), diag::err_paste_at_start);
ReleaseMacroInfo(MI);
return;
}
if (MI->getReplacementToken(NumTokens-1).is(tok::hashhash)) {
Diag(MI->getReplacementToken(NumTokens-1), diag::err_paste_at_end);
ReleaseMacroInfo(MI);
return;
}
}
// If this is the primary source file, remember that this macro hasn't been
// used yet.
if (isInPrimaryFile())
MI->setIsUsed(false);
MI->setDefinitionEndLoc(LastTok.getLocation());
// Finally, if this identifier already had a macro defined for it, verify that
// the macro bodies are identical and free the old definition.
if (MacroInfo *OtherMI = getMacroInfo(MacroNameTok.getIdentifierInfo())) {
// It is very common for system headers to have tons of macro redefinitions
// and for warnings to be disabled in system headers. If this is the case,
// then don't bother calling MacroInfo::isIdenticalTo.
if (!getDiagnostics().getSuppressSystemWarnings() ||
!SourceMgr.isInSystemHeader(DefineTok.getLocation())) {
if (!OtherMI->isUsed())
Diag(OtherMI->getDefinitionLoc(), diag::pp_macro_not_used);
// Macros must be identical. This means all tokens and whitespace
// separation must be the same. C99 6.10.3.2.
if (!OtherMI->isAllowRedefinitionsWithoutWarning() &&
!MI->isIdenticalTo(*OtherMI, *this)) {
Diag(MI->getDefinitionLoc(), diag::ext_pp_macro_redef)
<< MacroNameTok.getIdentifierInfo();
Diag(OtherMI->getDefinitionLoc(), diag::note_previous_definition);
}
}
ReleaseMacroInfo(OtherMI);
}
setMacroInfo(MacroNameTok.getIdentifierInfo(), MI);
// If the callbacks want to know, tell them about the macro definition.
if (Callbacks)
Callbacks->MacroDefined(MacroNameTok.getIdentifierInfo(), MI);
}
/// HandleUndefDirective - Implements #undef.
///
void Preprocessor::HandleUndefDirective(Token &UndefTok) {
++NumUndefined;
Token MacroNameTok;
ReadMacroName(MacroNameTok, 2);
// Error reading macro name? If so, diagnostic already issued.
if (MacroNameTok.is(tok::eom))
return;
// Check to see if this is the last token on the #undef line.
CheckEndOfDirective("undef");
// Okay, we finally have a valid identifier to undef.
MacroInfo *MI = getMacroInfo(MacroNameTok.getIdentifierInfo());
// If the macro is not defined, this is a noop undef, just return.
if (MI == 0) return;
if (!MI->isUsed())
Diag(MI->getDefinitionLoc(), diag::pp_macro_not_used);
// If the callbacks want to know, tell them about the macro #undef.
if (Callbacks)
Callbacks->MacroUndefined(MacroNameTok.getLocation(),
MacroNameTok.getIdentifierInfo(), MI);
// Free macro definition.
ReleaseMacroInfo(MI);
setMacroInfo(MacroNameTok.getIdentifierInfo(), 0);
}
//===----------------------------------------------------------------------===//
// Preprocessor Conditional Directive Handling.
//===----------------------------------------------------------------------===//
/// HandleIfdefDirective - Implements the #ifdef/#ifndef directive. isIfndef is
/// true when this is a #ifndef directive. ReadAnyTokensBeforeDirective is true
/// if any tokens have been returned or pp-directives activated before this
/// #ifndef has been lexed.
///
void Preprocessor::HandleIfdefDirective(Token &Result, bool isIfndef,
bool ReadAnyTokensBeforeDirective) {
++NumIf;
Token DirectiveTok = Result;
Token MacroNameTok;
ReadMacroName(MacroNameTok);
// Error reading macro name? If so, diagnostic already issued.
if (MacroNameTok.is(tok::eom)) {
// Skip code until we get to #endif. This helps with recovery by not
// emitting an error when the #endif is reached.
SkipExcludedConditionalBlock(DirectiveTok.getLocation(),
/*Foundnonskip*/false, /*FoundElse*/false);
return;
}
// Check to see if this is the last token on the #if[n]def line.
CheckEndOfDirective(isIfndef ? "ifndef" : "ifdef");
IdentifierInfo *MII = MacroNameTok.getIdentifierInfo();
MacroInfo *MI = getMacroInfo(MII);
if (CurPPLexer->getConditionalStackDepth() == 0) {
// If the start of a top-level #ifdef and if the macro is not defined,
// inform MIOpt that this might be the start of a proper include guard.
// Otherwise it is some other form of unknown conditional which we can't
// handle.
if (!ReadAnyTokensBeforeDirective && MI == 0) {
assert(isIfndef && "#ifdef shouldn't reach here");
CurPPLexer->MIOpt.EnterTopLevelIFNDEF(MII);
} else
CurPPLexer->MIOpt.EnterTopLevelConditional();
}
// If there is a macro, process it.
if (MI) // Mark it used.
MI->setIsUsed(true);
// Should we include the stuff contained by this directive?
if (!MI == isIfndef) {
// Yes, remember that we are inside a conditional, then lex the next token.
CurPPLexer->pushConditionalLevel(DirectiveTok.getLocation(),
/*wasskip*/false, /*foundnonskip*/true,
/*foundelse*/false);
} else {
// No, skip the contents of this block and return the first token after it.
SkipExcludedConditionalBlock(DirectiveTok.getLocation(),
/*Foundnonskip*/false,
/*FoundElse*/false);
}
}
/// HandleIfDirective - Implements the #if directive.
///
void Preprocessor::HandleIfDirective(Token &IfToken,
bool ReadAnyTokensBeforeDirective) {
++NumIf;
// Parse and evaluation the conditional expression.
IdentifierInfo *IfNDefMacro = 0;
bool ConditionalTrue = EvaluateDirectiveExpression(IfNDefMacro);
// If this condition is equivalent to #ifndef X, and if this is the first
// directive seen, handle it for the multiple-include optimization.
if (CurPPLexer->getConditionalStackDepth() == 0) {
if (!ReadAnyTokensBeforeDirective && IfNDefMacro && ConditionalTrue)
CurPPLexer->MIOpt.EnterTopLevelIFNDEF(IfNDefMacro);
else
CurPPLexer->MIOpt.EnterTopLevelConditional();
}
// Should we include the stuff contained by this directive?
if (ConditionalTrue) {
// Yes, remember that we are inside a conditional, then lex the next token.
CurPPLexer->pushConditionalLevel(IfToken.getLocation(), /*wasskip*/false,
/*foundnonskip*/true, /*foundelse*/false);
} else {
// No, skip the contents of this block and return the first token after it.
SkipExcludedConditionalBlock(IfToken.getLocation(), /*Foundnonskip*/false,
/*FoundElse*/false);
}
}
/// HandleEndifDirective - Implements the #endif directive.
///
void Preprocessor::HandleEndifDirective(Token &EndifToken) {
++NumEndif;
// Check that this is the whole directive.
CheckEndOfDirective("endif");
PPConditionalInfo CondInfo;
if (CurPPLexer->popConditionalLevel(CondInfo)) {
// No conditionals on the stack: this is an #endif without an #if.
Diag(EndifToken, diag::err_pp_endif_without_if);
return;
}
// If this the end of a top-level #endif, inform MIOpt.
if (CurPPLexer->getConditionalStackDepth() == 0)
CurPPLexer->MIOpt.ExitTopLevelConditional();
assert(!CondInfo.WasSkipping && !CurPPLexer->LexingRawMode &&
"This code should only be reachable in the non-skipping case!");
}
void Preprocessor::HandleElseDirective(Token &Result) {
++NumElse;
// #else directive in a non-skipping conditional... start skipping.
CheckEndOfDirective("else");
PPConditionalInfo CI;
if (CurPPLexer->popConditionalLevel(CI)) {
Diag(Result, diag::pp_err_else_without_if);
return;
}
// If this is a top-level #else, inform the MIOpt.
if (CurPPLexer->getConditionalStackDepth() == 0)
CurPPLexer->MIOpt.EnterTopLevelConditional();
// If this is a #else with a #else before it, report the error.
if (CI.FoundElse) Diag(Result, diag::pp_err_else_after_else);
// Finally, skip the rest of the contents of this block and return the first
// token after it.
return SkipExcludedConditionalBlock(CI.IfLoc, /*Foundnonskip*/true,
/*FoundElse*/true);
}
void Preprocessor::HandleElifDirective(Token &ElifToken) {
++NumElse;
// #elif directive in a non-skipping conditional... start skipping.
// We don't care what the condition is, because we will always skip it (since
// the block immediately before it was included).
DiscardUntilEndOfDirective();
PPConditionalInfo CI;
if (CurPPLexer->popConditionalLevel(CI)) {
Diag(ElifToken, diag::pp_err_elif_without_if);
return;
}
// If this is a top-level #elif, inform the MIOpt.
if (CurPPLexer->getConditionalStackDepth() == 0)
CurPPLexer->MIOpt.EnterTopLevelConditional();
// If this is a #elif with a #else before it, report the error.
if (CI.FoundElse) Diag(ElifToken, diag::pp_err_elif_after_else);
// Finally, skip the rest of the contents of this block and return the first
// token after it.
return SkipExcludedConditionalBlock(CI.IfLoc, /*Foundnonskip*/true,
/*FoundElse*/CI.FoundElse);
}
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