forked from OSchip/llvm-project
1666 lines
60 KiB
C++
1666 lines
60 KiB
C++
//===--- PPDirectives.cpp - Directive Handling for Preprocessor -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements # directive processing for the Preprocessor.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Lex/Preprocessor.h"
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#include "clang/Lex/LiteralSupport.h"
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#include "clang/Lex/HeaderSearch.h"
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#include "clang/Lex/MacroInfo.h"
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#include "clang/Lex/LexDiagnostic.h"
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#include "clang/Basic/SourceManager.h"
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#include "llvm/ADT/APInt.h"
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using namespace clang;
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//===----------------------------------------------------------------------===//
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// Utility Methods for Preprocessor Directive Handling.
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//===----------------------------------------------------------------------===//
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MacroInfo *Preprocessor::AllocateMacroInfo(SourceLocation L) {
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MacroInfo *MI;
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if (!MICache.empty()) {
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MI = MICache.back();
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MICache.pop_back();
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} else
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MI = (MacroInfo*) BP.Allocate<MacroInfo>();
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new (MI) MacroInfo(L);
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return MI;
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}
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/// ReleaseMacroInfo - Release the specified MacroInfo. This memory will
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/// be reused for allocating new MacroInfo objects.
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void Preprocessor::ReleaseMacroInfo(MacroInfo* MI) {
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MICache.push_back(MI);
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MI->FreeArgumentList(BP);
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}
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/// DiscardUntilEndOfDirective - Read and discard all tokens remaining on the
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/// current line until the tok::eom token is found.
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void Preprocessor::DiscardUntilEndOfDirective() {
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Token Tmp;
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do {
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LexUnexpandedToken(Tmp);
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} while (Tmp.isNot(tok::eom));
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}
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/// ReadMacroName - Lex and validate a macro name, which occurs after a
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/// #define or #undef. This sets the token kind to eom and discards the rest
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/// of the macro line if the macro name is invalid. isDefineUndef is 1 if
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/// this is due to a a #define, 2 if #undef directive, 0 if it is something
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/// else (e.g. #ifdef).
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void Preprocessor::ReadMacroName(Token &MacroNameTok, char isDefineUndef) {
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// Read the token, don't allow macro expansion on it.
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LexUnexpandedToken(MacroNameTok);
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// Missing macro name?
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if (MacroNameTok.is(tok::eom)) {
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Diag(MacroNameTok, diag::err_pp_missing_macro_name);
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return;
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}
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IdentifierInfo *II = MacroNameTok.getIdentifierInfo();
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if (II == 0) {
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std::string Spelling = getSpelling(MacroNameTok);
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const IdentifierInfo &Info = Identifiers.get(Spelling);
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if (Info.isCPlusPlusOperatorKeyword())
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// C++ 2.5p2: Alternative tokens behave the same as its primary token
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// except for their spellings.
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Diag(MacroNameTok, diag::err_pp_operator_used_as_macro_name) << Spelling;
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else
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Diag(MacroNameTok, diag::err_pp_macro_not_identifier);
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// Fall through on error.
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} else if (isDefineUndef && II->getPPKeywordID() == tok::pp_defined) {
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// Error if defining "defined": C99 6.10.8.4.
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Diag(MacroNameTok, diag::err_defined_macro_name);
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} else if (isDefineUndef && II->hasMacroDefinition() &&
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getMacroInfo(II)->isBuiltinMacro()) {
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// Error if defining "__LINE__" and other builtins: C99 6.10.8.4.
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if (isDefineUndef == 1)
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Diag(MacroNameTok, diag::pp_redef_builtin_macro);
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else
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Diag(MacroNameTok, diag::pp_undef_builtin_macro);
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} else {
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// Okay, we got a good identifier node. Return it.
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return;
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}
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// Invalid macro name, read and discard the rest of the line. Then set the
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// token kind to tok::eom.
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MacroNameTok.setKind(tok::eom);
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return DiscardUntilEndOfDirective();
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}
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/// CheckEndOfDirective - Ensure that the next token is a tok::eom token. If
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/// not, emit a diagnostic and consume up until the eom. If EnableMacros is
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/// true, then we consider macros that expand to zero tokens as being ok.
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void Preprocessor::CheckEndOfDirective(const char *DirType, bool EnableMacros) {
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Token Tmp;
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// Lex unexpanded tokens for most directives: macros might expand to zero
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// tokens, causing us to miss diagnosing invalid lines. Some directives (like
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// #line) allow empty macros.
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if (EnableMacros)
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Lex(Tmp);
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else
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LexUnexpandedToken(Tmp);
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// There should be no tokens after the directive, but we allow them as an
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// extension.
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while (Tmp.is(tok::comment)) // Skip comments in -C mode.
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LexUnexpandedToken(Tmp);
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if (Tmp.isNot(tok::eom)) {
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// Add a fixit in GNU/C99/C++ mode. Don't offer a fixit for strict-C89,
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// because it is more trouble than it is worth to insert /**/ and check that
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// there is no /**/ in the range also.
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CodeModificationHint FixItHint;
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if (Features.GNUMode || Features.C99 || Features.CPlusPlus)
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FixItHint = CodeModificationHint::CreateInsertion(Tmp.getLocation(),"//");
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Diag(Tmp, diag::ext_pp_extra_tokens_at_eol) << DirType << FixItHint;
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DiscardUntilEndOfDirective();
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}
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}
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/// SkipExcludedConditionalBlock - We just read a #if or related directive and
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/// decided that the subsequent tokens are in the #if'd out portion of the
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/// file. Lex the rest of the file, until we see an #endif. If
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/// FoundNonSkipPortion is true, then we have already emitted code for part of
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/// this #if directive, so #else/#elif blocks should never be entered. If ElseOk
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/// is true, then #else directives are ok, if not, then we have already seen one
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/// so a #else directive is a duplicate. When this returns, the caller can lex
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/// the first valid token.
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void Preprocessor::SkipExcludedConditionalBlock(SourceLocation IfTokenLoc,
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bool FoundNonSkipPortion,
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bool FoundElse) {
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++NumSkipped;
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assert(CurTokenLexer == 0 && CurPPLexer && "Lexing a macro, not a file?");
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CurPPLexer->pushConditionalLevel(IfTokenLoc, /*isSkipping*/false,
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FoundNonSkipPortion, FoundElse);
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if (CurPTHLexer) {
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PTHSkipExcludedConditionalBlock();
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return;
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}
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// Enter raw mode to disable identifier lookup (and thus macro expansion),
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// disabling warnings, etc.
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CurPPLexer->LexingRawMode = true;
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Token Tok;
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while (1) {
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if (CurLexer)
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CurLexer->Lex(Tok);
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else
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CurPTHLexer->Lex(Tok);
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// If this is the end of the buffer, we have an error.
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if (Tok.is(tok::eof)) {
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// Emit errors for each unterminated conditional on the stack, including
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// the current one.
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while (!CurPPLexer->ConditionalStack.empty()) {
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Diag(CurPPLexer->ConditionalStack.back().IfLoc,
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diag::err_pp_unterminated_conditional);
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CurPPLexer->ConditionalStack.pop_back();
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}
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// Just return and let the caller lex after this #include.
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break;
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}
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// If this token is not a preprocessor directive, just skip it.
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if (Tok.isNot(tok::hash) || !Tok.isAtStartOfLine())
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continue;
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// We just parsed a # character at the start of a line, so we're in
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// directive mode. Tell the lexer this so any newlines we see will be
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// converted into an EOM token (this terminates the macro).
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CurPPLexer->ParsingPreprocessorDirective = true;
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if (CurLexer) CurLexer->SetCommentRetentionState(false);
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// Read the next token, the directive flavor.
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LexUnexpandedToken(Tok);
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// If this isn't an identifier directive (e.g. is "# 1\n" or "#\n", or
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// something bogus), skip it.
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if (Tok.isNot(tok::identifier)) {
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CurPPLexer->ParsingPreprocessorDirective = false;
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// Restore comment saving mode.
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if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments);
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continue;
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}
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// If the first letter isn't i or e, it isn't intesting to us. We know that
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// this is safe in the face of spelling differences, because there is no way
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// to spell an i/e in a strange way that is another letter. Skipping this
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// allows us to avoid looking up the identifier info for #define/#undef and
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// other common directives.
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const char *RawCharData = SourceMgr.getCharacterData(Tok.getLocation());
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char FirstChar = RawCharData[0];
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if (FirstChar >= 'a' && FirstChar <= 'z' &&
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FirstChar != 'i' && FirstChar != 'e') {
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CurPPLexer->ParsingPreprocessorDirective = false;
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// Restore comment saving mode.
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if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments);
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continue;
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}
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// Get the identifier name without trigraphs or embedded newlines. Note
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// that we can't use Tok.getIdentifierInfo() because its lookup is disabled
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// when skipping.
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// TODO: could do this with zero copies in the no-clean case by using
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// strncmp below.
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char Directive[20];
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unsigned IdLen;
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if (!Tok.needsCleaning() && Tok.getLength() < 20) {
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IdLen = Tok.getLength();
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memcpy(Directive, RawCharData, IdLen);
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Directive[IdLen] = 0;
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} else {
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std::string DirectiveStr = getSpelling(Tok);
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IdLen = DirectiveStr.size();
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if (IdLen >= 20) {
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CurPPLexer->ParsingPreprocessorDirective = false;
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// Restore comment saving mode.
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if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments);
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continue;
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}
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memcpy(Directive, &DirectiveStr[0], IdLen);
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Directive[IdLen] = 0;
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FirstChar = Directive[0];
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}
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if (FirstChar == 'i' && Directive[1] == 'f') {
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if ((IdLen == 2) || // "if"
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(IdLen == 5 && !strcmp(Directive+2, "def")) || // "ifdef"
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(IdLen == 6 && !strcmp(Directive+2, "ndef"))) { // "ifndef"
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// We know the entire #if/#ifdef/#ifndef block will be skipped, don't
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// bother parsing the condition.
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DiscardUntilEndOfDirective();
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CurPPLexer->pushConditionalLevel(Tok.getLocation(), /*wasskipping*/true,
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/*foundnonskip*/false,
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/*fnddelse*/false);
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}
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} else if (FirstChar == 'e') {
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if (IdLen == 5 && !strcmp(Directive+1, "ndif")) { // "endif"
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CheckEndOfDirective("endif");
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PPConditionalInfo CondInfo;
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CondInfo.WasSkipping = true; // Silence bogus warning.
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bool InCond = CurPPLexer->popConditionalLevel(CondInfo);
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InCond = InCond; // Silence warning in no-asserts mode.
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assert(!InCond && "Can't be skipping if not in a conditional!");
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// If we popped the outermost skipping block, we're done skipping!
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if (!CondInfo.WasSkipping)
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break;
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} else if (IdLen == 4 && !strcmp(Directive+1, "lse")) { // "else".
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// #else directive in a skipping conditional. If not in some other
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// skipping conditional, and if #else hasn't already been seen, enter it
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// as a non-skipping conditional.
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DiscardUntilEndOfDirective(); // C99 6.10p4.
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PPConditionalInfo &CondInfo = CurPPLexer->peekConditionalLevel();
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// If this is a #else with a #else before it, report the error.
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if (CondInfo.FoundElse) Diag(Tok, diag::pp_err_else_after_else);
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// Note that we've seen a #else in this conditional.
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CondInfo.FoundElse = true;
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// If the conditional is at the top level, and the #if block wasn't
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// entered, enter the #else block now.
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if (!CondInfo.WasSkipping && !CondInfo.FoundNonSkip) {
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CondInfo.FoundNonSkip = true;
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break;
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}
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} else if (IdLen == 4 && !strcmp(Directive+1, "lif")) { // "elif".
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PPConditionalInfo &CondInfo = CurPPLexer->peekConditionalLevel();
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bool ShouldEnter;
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// If this is in a skipping block or if we're already handled this #if
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// block, don't bother parsing the condition.
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if (CondInfo.WasSkipping || CondInfo.FoundNonSkip) {
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DiscardUntilEndOfDirective();
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ShouldEnter = false;
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} else {
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// Restore the value of LexingRawMode so that identifiers are
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// looked up, etc, inside the #elif expression.
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assert(CurPPLexer->LexingRawMode && "We have to be skipping here!");
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CurPPLexer->LexingRawMode = false;
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IdentifierInfo *IfNDefMacro = 0;
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ShouldEnter = EvaluateDirectiveExpression(IfNDefMacro);
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CurPPLexer->LexingRawMode = true;
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}
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// If this is a #elif with a #else before it, report the error.
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if (CondInfo.FoundElse) Diag(Tok, diag::pp_err_elif_after_else);
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// If this condition is true, enter it!
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if (ShouldEnter) {
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CondInfo.FoundNonSkip = true;
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break;
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}
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}
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}
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CurPPLexer->ParsingPreprocessorDirective = false;
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// Restore comment saving mode.
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if (CurLexer) CurLexer->SetCommentRetentionState(KeepComments);
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}
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// Finally, if we are out of the conditional (saw an #endif or ran off the end
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// of the file, just stop skipping and return to lexing whatever came after
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// the #if block.
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CurPPLexer->LexingRawMode = false;
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}
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void Preprocessor::PTHSkipExcludedConditionalBlock() {
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while(1) {
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assert(CurPTHLexer);
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assert(CurPTHLexer->LexingRawMode == false);
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// Skip to the next '#else', '#elif', or #endif.
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if (CurPTHLexer->SkipBlock()) {
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// We have reached an #endif. Both the '#' and 'endif' tokens
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// have been consumed by the PTHLexer. Just pop off the condition level.
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PPConditionalInfo CondInfo;
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bool InCond = CurPTHLexer->popConditionalLevel(CondInfo);
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InCond = InCond; // Silence warning in no-asserts mode.
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assert(!InCond && "Can't be skipping if not in a conditional!");
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break;
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}
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// We have reached a '#else' or '#elif'. Lex the next token to get
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// the directive flavor.
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Token Tok;
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LexUnexpandedToken(Tok);
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// We can actually look up the IdentifierInfo here since we aren't in
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// raw mode.
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tok::PPKeywordKind K = Tok.getIdentifierInfo()->getPPKeywordID();
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if (K == tok::pp_else) {
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// #else: Enter the else condition. We aren't in a nested condition
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// since we skip those. We're always in the one matching the last
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// blocked we skipped.
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PPConditionalInfo &CondInfo = CurPTHLexer->peekConditionalLevel();
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// Note that we've seen a #else in this conditional.
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CondInfo.FoundElse = true;
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// If the #if block wasn't entered then enter the #else block now.
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if (!CondInfo.FoundNonSkip) {
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CondInfo.FoundNonSkip = true;
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// Scan until the eom token.
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CurPTHLexer->ParsingPreprocessorDirective = true;
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DiscardUntilEndOfDirective();
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CurPTHLexer->ParsingPreprocessorDirective = false;
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break;
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}
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// Otherwise skip this block.
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continue;
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}
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assert(K == tok::pp_elif);
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PPConditionalInfo &CondInfo = CurPTHLexer->peekConditionalLevel();
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// If this is a #elif with a #else before it, report the error.
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if (CondInfo.FoundElse)
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Diag(Tok, diag::pp_err_elif_after_else);
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// If this is in a skipping block or if we're already handled this #if
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// block, don't bother parsing the condition. We just skip this block.
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if (CondInfo.FoundNonSkip)
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continue;
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// Evaluate the condition of the #elif.
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IdentifierInfo *IfNDefMacro = 0;
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CurPTHLexer->ParsingPreprocessorDirective = true;
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bool ShouldEnter = EvaluateDirectiveExpression(IfNDefMacro);
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CurPTHLexer->ParsingPreprocessorDirective = false;
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// If this condition is true, enter it!
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if (ShouldEnter) {
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CondInfo.FoundNonSkip = true;
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break;
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}
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// Otherwise, skip this block and go to the next one.
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continue;
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}
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}
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/// LookupFile - Given a "foo" or <foo> reference, look up the indicated file,
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/// return null on failure. isAngled indicates whether the file reference is
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/// for system #include's or not (i.e. using <> instead of "").
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const FileEntry *Preprocessor::LookupFile(const char *FilenameStart,
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const char *FilenameEnd,
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bool isAngled,
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const DirectoryLookup *FromDir,
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const DirectoryLookup *&CurDir) {
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// If the header lookup mechanism may be relative to the current file, pass in
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// info about where the current file is.
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const FileEntry *CurFileEnt = 0;
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if (!FromDir) {
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FileID FID = getCurrentFileLexer()->getFileID();
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CurFileEnt = SourceMgr.getFileEntryForID(FID);
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// If there is no file entry associated with this file, it must be the
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// predefines buffer. Any other file is not lexed with a normal lexer, so
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// it won't be scanned for preprocessor directives. If we have the
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// predefines buffer, resolve #include references (which come from the
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// -include command line argument) as if they came from the main file, this
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// affects file lookup etc.
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if (CurFileEnt == 0) {
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FID = SourceMgr.getMainFileID();
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CurFileEnt = SourceMgr.getFileEntryForID(FID);
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}
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}
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// Do a standard file entry lookup.
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CurDir = CurDirLookup;
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const FileEntry *FE =
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HeaderInfo.LookupFile(FilenameStart, FilenameEnd,
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isAngled, FromDir, CurDir, CurFileEnt);
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if (FE) return FE;
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// Otherwise, see if this is a subframework header. If so, this is relative
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// to one of the headers on the #include stack. Walk the list of the current
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// headers on the #include stack and pass them to HeaderInfo.
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if (IsFileLexer()) {
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if ((CurFileEnt = SourceMgr.getFileEntryForID(CurPPLexer->getFileID())))
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if ((FE = HeaderInfo.LookupSubframeworkHeader(FilenameStart, FilenameEnd,
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CurFileEnt)))
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return FE;
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}
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for (unsigned i = 0, e = IncludeMacroStack.size(); i != e; ++i) {
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IncludeStackInfo &ISEntry = IncludeMacroStack[e-i-1];
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if (IsFileLexer(ISEntry)) {
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if ((CurFileEnt =
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SourceMgr.getFileEntryForID(ISEntry.ThePPLexer->getFileID())))
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if ((FE = HeaderInfo.LookupSubframeworkHeader(FilenameStart,
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FilenameEnd, CurFileEnt)))
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return FE;
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}
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}
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// Otherwise, we really couldn't find the file.
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return 0;
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}
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//===----------------------------------------------------------------------===//
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|
// 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::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();
|
|
|
|
// 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];
|
|
unsigned ActualLength = PP.getSpelling(DigitTok, DigitTokBegin);
|
|
|
|
// 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(DigitTok.getLocation(), 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(DigitTok.getLocation(), 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)
|
|
Callbacks->Ident(Tok.getLocation(), getSpelling(StrTok));
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// 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,
|
|
const char *&BufStart,
|
|
const char *&BufEnd) {
|
|
// Get the text form of the filename.
|
|
assert(BufStart != BufEnd && "Can't have tokens with empty spellings!");
|
|
|
|
// Make sure the filename is <x> or "x".
|
|
bool isAngled;
|
|
if (BufStart[0] == '<') {
|
|
if (BufEnd[-1] != '>') {
|
|
Diag(Loc, diag::err_pp_expects_filename);
|
|
BufStart = 0;
|
|
return true;
|
|
}
|
|
isAngled = true;
|
|
} else if (BufStart[0] == '"') {
|
|
if (BufEnd[-1] != '"') {
|
|
Diag(Loc, diag::err_pp_expects_filename);
|
|
BufStart = 0;
|
|
return true;
|
|
}
|
|
isAngled = false;
|
|
} else {
|
|
Diag(Loc, diag::err_pp_expects_filename);
|
|
BufStart = 0;
|
|
return true;
|
|
}
|
|
|
|
// Diagnose #include "" as invalid.
|
|
if (BufEnd-BufStart <= 2) {
|
|
Diag(Loc, diag::err_pp_empty_filename);
|
|
BufStart = 0;
|
|
return "";
|
|
}
|
|
|
|
// Skip the brackets.
|
|
++BufStart;
|
|
--BufEnd;
|
|
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.
|
|
static bool ConcatenateIncludeName(llvm::SmallVector<char, 128> &FilenameBuffer,
|
|
Preprocessor &PP) {
|
|
Token CurTok;
|
|
|
|
PP.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 = PP.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;
|
|
|
|
PP.Lex(CurTok);
|
|
}
|
|
|
|
// If we hit the eom marker, emit an error and return true so that the caller
|
|
// knows the EOM has been read.
|
|
PP.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::SmallVector<char, 128> FilenameBuffer;
|
|
const char *FilenameStart, *FilenameEnd;
|
|
|
|
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: {
|
|
FilenameBuffer.resize(FilenameTok.getLength());
|
|
FilenameStart = &FilenameBuffer[0];
|
|
unsigned Len = getSpelling(FilenameTok, FilenameStart);
|
|
FilenameEnd = FilenameStart+Len;
|
|
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, *this))
|
|
return; // Found <eom> but no ">"? Diagnostic already emitted.
|
|
FilenameStart = FilenameBuffer.data();
|
|
FilenameEnd = FilenameStart + FilenameBuffer.size();
|
|
break;
|
|
default:
|
|
Diag(FilenameTok.getLocation(), diag::err_pp_expects_filename);
|
|
DiscardUntilEndOfDirective();
|
|
return;
|
|
}
|
|
|
|
bool isAngled = GetIncludeFilenameSpelling(FilenameTok.getLocation(),
|
|
FilenameStart, FilenameEnd);
|
|
// If GetIncludeFilenameSpelling set the start ptr to null, there was an
|
|
// error.
|
|
if (FilenameStart == 0) {
|
|
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()->getName(), 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(FilenameStart, FilenameEnd,
|
|
isAngled, LookupFrom, CurDir);
|
|
if (File == 0) {
|
|
Diag(FilenameTok, diag::err_pp_file_not_found)
|
|
<< std::string(FilenameStart, FilenameEnd);
|
|
return;
|
|
}
|
|
|
|
// Ask HeaderInfo if we should enter this #include file. If not, #including
|
|
// this file will have no effect.
|
|
if (!HeaderInfo.ShouldEnterIncludeFile(File, isImport))
|
|
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()));
|
|
|
|
// 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)
|
|
<< std::string(FilenameStart, FilenameEnd);
|
|
return;
|
|
}
|
|
|
|
// Finally, if all is good, enter the new file!
|
|
EnterSourceFile(FID, CurDir);
|
|
}
|
|
|
|
/// 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 tokes and whitespace
|
|
// separation must be the same. C99 6.10.3.2.
|
|
if (!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.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");
|
|
|
|
if (CurPPLexer->getConditionalStackDepth() == 0) {
|
|
// If the start of a top-level #ifdef, inform MIOpt.
|
|
if (!ReadAnyTokensBeforeDirective) {
|
|
assert(isIfndef && "#ifdef shouldn't reach here");
|
|
CurPPLexer->MIOpt.EnterTopLevelIFNDEF(MacroNameTok.getIdentifierInfo());
|
|
} else
|
|
CurPPLexer->MIOpt.EnterTopLevelConditional();
|
|
}
|
|
|
|
IdentifierInfo *MII = MacroNameTok.getIdentifierInfo();
|
|
MacroInfo *MI = getMacroInfo(MII);
|
|
|
|
// 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)
|
|
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);
|
|
}
|
|
|