split preprocesor directive handling out of Preprocessor.cpp into Directives.cpp
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@48068 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Lex/Directives.cpp b/Lex/Directives.cpp
new file mode 100644
index 0000000..ea099f7
--- /dev/null
+++ b/Lex/Directives.cpp
@@ -0,0 +1,1105 @@
+//===--- Directives.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/HeaderSearch.h"
+#include "clang/Lex/MacroInfo.h"
+#include "clang/Lex/PPCallbacks.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/SourceManager.h"
+using namespace clang;
+
+//===----------------------------------------------------------------------===//
+// Utility Methods for Preprocessor Directive Handling.
+//===----------------------------------------------------------------------===//
+
+/// 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));
+}
+
+/// isCXXNamedOperator - Returns "true" if the token is a named operator in C++.
+static bool isCXXNamedOperator(const std::string &Spelling) {
+ return Spelling == "and" || Spelling == "bitand" || Spelling == "bitor" ||
+ Spelling == "compl" || Spelling == "not" || Spelling == "not_eq" ||
+ Spelling == "or" || Spelling == "xor";
+}
+
+/// 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);
+
+ // Missing macro name?
+ if (MacroNameTok.is(tok::eom))
+ return Diag(MacroNameTok, diag::err_pp_missing_macro_name);
+
+ IdentifierInfo *II = MacroNameTok.getIdentifierInfo();
+ if (II == 0) {
+ std::string Spelling = getSpelling(MacroNameTok);
+ if (isCXXNamedOperator(Spelling))
+ // 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.
+void Preprocessor::CheckEndOfDirective(const char *DirType) {
+ Token Tmp;
+ // Lex unexpanded tokens: macros might expand to zero tokens, causing us to
+ // miss diagnosing invalid lines.
+ 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)) {
+ Diag(Tmp, diag::ext_pp_extra_tokens_at_eol, DirType);
+ 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(CurMacroExpander == 0 && CurLexer &&
+ "Lexing a macro, not a file?");
+
+ CurLexer->pushConditionalLevel(IfTokenLoc, /*isSkipping*/false,
+ FoundNonSkipPortion, FoundElse);
+
+ // Enter raw mode to disable identifier lookup (and thus macro expansion),
+ // disabling warnings, etc.
+ CurLexer->LexingRawMode = true;
+ Token Tok;
+ while (1) {
+ CurLexer->Lex(Tok);
+
+ // 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 (!CurLexer->ConditionalStack.empty()) {
+ Diag(CurLexer->ConditionalStack.back().IfLoc,
+ diag::err_pp_unterminated_conditional);
+ CurLexer->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).
+ CurLexer->ParsingPreprocessorDirective = true;
+ CurLexer->KeepCommentMode = 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)) {
+ CurLexer->ParsingPreprocessorDirective = false;
+ // Restore comment saving mode.
+ CurLexer->KeepCommentMode = 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.
+ const char *RawCharData = SourceMgr.getCharacterData(Tok.getLocation());
+ char FirstChar = RawCharData[0];
+ if (FirstChar >= 'a' && FirstChar <= 'z' &&
+ FirstChar != 'i' && FirstChar != 'e') {
+ CurLexer->ParsingPreprocessorDirective = false;
+ // Restore comment saving mode.
+ CurLexer->KeepCommentMode = 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.
+ // TODO: could do this with zero copies in the no-clean case by using
+ // strncmp below.
+ char Directive[20];
+ unsigned IdLen;
+ if (!Tok.needsCleaning() && Tok.getLength() < 20) {
+ IdLen = Tok.getLength();
+ memcpy(Directive, RawCharData, IdLen);
+ Directive[IdLen] = 0;
+ } else {
+ std::string DirectiveStr = getSpelling(Tok);
+ IdLen = DirectiveStr.size();
+ if (IdLen >= 20) {
+ CurLexer->ParsingPreprocessorDirective = false;
+ // Restore comment saving mode.
+ CurLexer->KeepCommentMode = KeepComments;
+ continue;
+ }
+ memcpy(Directive, &DirectiveStr[0], IdLen);
+ Directive[IdLen] = 0;
+ }
+
+ if (FirstChar == 'i' && Directive[1] == 'f') {
+ if ((IdLen == 2) || // "if"
+ (IdLen == 5 && !strcmp(Directive+2, "def")) || // "ifdef"
+ (IdLen == 6 && !strcmp(Directive+2, "ndef"))) { // "ifndef"
+ // We know the entire #if/#ifdef/#ifndef block will be skipped, don't
+ // bother parsing the condition.
+ DiscardUntilEndOfDirective();
+ CurLexer->pushConditionalLevel(Tok.getLocation(), /*wasskipping*/true,
+ /*foundnonskip*/false,
+ /*fnddelse*/false);
+ }
+ } else if (FirstChar == 'e') {
+ if (IdLen == 5 && !strcmp(Directive+1, "ndif")) { // "endif"
+ CheckEndOfDirective("#endif");
+ PPConditionalInfo CondInfo;
+ CondInfo.WasSkipping = true; // Silence bogus warning.
+ bool InCond = CurLexer->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 (IdLen == 4 && !strcmp(Directive+1, "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.
+ CheckEndOfDirective("#else");
+ PPConditionalInfo &CondInfo = CurLexer->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 (IdLen == 4 && !strcmp(Directive+1, "lif")) { // "elif".
+ PPConditionalInfo &CondInfo = CurLexer->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(CurLexer->LexingRawMode && "We have to be skipping here!");
+ CurLexer->LexingRawMode = false;
+ IdentifierInfo *IfNDefMacro = 0;
+ ShouldEnter = EvaluateDirectiveExpression(IfNDefMacro);
+ CurLexer->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;
+ }
+ }
+ }
+
+ CurLexer->ParsingPreprocessorDirective = false;
+ // Restore comment saving mode.
+ CurLexer->KeepCommentMode = 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.
+ CurLexer->LexingRawMode = false;
+}
+
+
+//===----------------------------------------------------------------------===//
+// 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).
+ CurLexer->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 = CurLexer->MIOpt.getHasReadAnyTokensVal();
+
+ // 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:
+ // FIXME: implement # 7 line numbers!
+ DiscardUntilEndOfDirective();
+ return;
+ 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.
+
+ // 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:
+ // FIXME: implement #line
+ DiscardUntilEndOfDirective();
+ return;
+
+ // 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 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.
+}
+
+void Preprocessor::HandleUserDiagnosticDirective(Token &Tok,
+ bool isWarning) {
+ // 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();
+
+ unsigned DiagID = isWarning ? diag::pp_hash_warning : diag::err_pp_hash_error;
+ return Diag(Tok, DiagID, 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))
+ return Diag(StrTok, diag::err_pp_malformed_ident);
+
+ // 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.
+void Preprocessor::HandleIncludeDirective(Token &IncludeTok,
+ const DirectoryLookup *LookupFrom,
+ bool isImport) {
+
+ Token FilenameTok;
+ CurLexer->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[0];
+ FilenameEnd = &FilenameBuffer[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. Use the
+ // preprocessor to lex this in case lexing the filename entered a macro.
+ CheckEndOfDirective("#include");
+
+ // Check that we don't have infinite #include recursion.
+ if (IncludeMacroStack.size() == MaxAllowedIncludeStackDepth-1)
+ return Diag(FilenameTok, diag::err_pp_include_too_deep);
+
+ // Search include directories.
+ const DirectoryLookup *CurDir;
+ const FileEntry *File = LookupFile(FilenameStart, FilenameEnd,
+ isAngled, LookupFrom, CurDir);
+ if (File == 0)
+ return Diag(FilenameTok, diag::err_pp_file_not_found,
+ std::string(FilenameStart, FilenameEnd));
+
+ // Ask HeaderInfo if we should enter this #include file.
+ if (!HeaderInfo.ShouldEnterIncludeFile(File, isImport)) {
+ // If it returns true, #including this file will have no effect.
+ return;
+ }
+
+ // Look up the file, create a File ID for it.
+ unsigned FileID = SourceMgr.createFileID(File, FilenameTok.getLocation());
+ if (FileID == 0)
+ return Diag(FilenameTok, diag::err_pp_file_not_found,
+ std::string(FilenameStart, FilenameEnd));
+
+ // Finally, if all is good, enter the new file!
+ EnterSourceFile(FileID, 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) {
+ Diag(ImportTok, diag::ext_pp_import_directive);
+
+ return HandleIncludeDirective(ImportTok, 0, true);
+}
+
+//===----------------------------------------------------------------------===//
+// 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()
+ MI->setArgumentList(Arguments.begin(), Arguments.end());
+ 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.begin(), Arguments.end());
+ 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->getName());
+ 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.begin(), Arguments.end());
+ 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.begin(), Arguments.end());
+ 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;
+
+ // If we are supposed to keep comments in #defines, reenable comment saving
+ // mode.
+ CurLexer->KeepCommentMode = KeepMacroComments;
+
+ // Create the new macro.
+ MacroInfo *MI = new MacroInfo(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.is(tok::l_paren) && !Tok.hasLeadingSpace()) {
+ // This is a function-like macro definition. Read the argument list.
+ MI->setIsFunctionLike();
+ if (ReadMacroDefinitionArgList(MI)) {
+ // Forget about MI.
+ delete MI;
+ // Throw away the rest of the line.
+ if (CurLexer->ParsingPreprocessorDirective)
+ DiscardUntilEndOfDirective();
+ return;
+ }
+
+ // Read the first token after the arg list for down below.
+ LexUnexpandedToken(Tok);
+ } else if (!Tok.hasLeadingSpace()) {
+ // C99 requires whitespace between the macro definition and the body. Emit
+ // a diagnostic for something like "#define X+".
+ if (Features.C99) {
+ Diag(Tok, diag::ext_c99_whitespace_required_after_macro_name);
+ } else {
+ // FIXME: C90/C++ do not get this diagnostic, but it does get a similar
+ // one in some cases!
+ }
+ } else {
+ // 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);
+ }
+
+ // 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 rest of the macro body.
+ if (MI->isObjectLike()) {
+ // Object-like macros are very simple, just read their body.
+ while (Tok.isNot(tok::eom)) {
+ MI->AddTokenToBody(Tok);
+ // Get the next token of the macro.
+ LexUnexpandedToken(Tok);
+ }
+
+ } else {
+ // Otherwise, read the body of a function-like macro. This has to validate
+ // the # (stringize) operator.
+ while (Tok.isNot(tok::eom)) {
+ MI->AddTokenToBody(Tok);
+
+ // Check C99 6.10.3.2p1: ensure that # operators are followed by macro
+ // parameters in function-like macro expansions.
+ if (Tok.isNot(tok::hash)) {
+ // Get the next token of the macro.
+ LexUnexpandedToken(Tok);
+ continue;
+ }
+
+ // Get the next token of the macro.
+ LexUnexpandedToken(Tok);
+
+ // Not a macro arg identifier?
+ if (!Tok.getIdentifierInfo() ||
+ MI->getArgumentNum(Tok.getIdentifierInfo()) == -1) {
+ Diag(Tok, diag::err_pp_stringize_not_parameter);
+ delete MI;
+
+ // Disable __VA_ARGS__ again.
+ Ident__VA_ARGS__->setIsPoisoned(true);
+ return;
+ }
+
+ // Things look ok, add the param name token to the macro.
+ MI->AddTokenToBody(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);
+ delete MI;
+ return;
+ }
+ if (MI->getReplacementToken(NumTokens-1).is(tok::hashhash)) {
+ Diag(MI->getReplacementToken(NumTokens-1), diag::err_paste_at_end);
+ delete MI;
+ return;
+ }
+ }
+
+ // If this is the primary source file, remember that this macro hasn't been
+ // used yet.
+ if (isInPrimaryFile())
+ MI->setIsUsed(false);
+
+ // 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())) {
+ 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()->getName());
+ Diag(OtherMI->getDefinitionLoc(), diag::ext_pp_macro_redef2);
+ }
+ delete OtherMI;
+ }
+
+ setMacroInfo(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);
+
+ // Free macro definition.
+ delete 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 (CurLexer->getConditionalStackDepth() == 0) {
+ // If the start of a top-level #ifdef, inform MIOpt.
+ if (!ReadAnyTokensBeforeDirective) {
+ assert(isIfndef && "#ifdef shouldn't reach here");
+ CurLexer->MIOpt.EnterTopLevelIFNDEF(MacroNameTok.getIdentifierInfo());
+ } else
+ CurLexer->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.
+ CurLexer->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);
+
+ // Should we include the stuff contained by this directive?
+ if (ConditionalTrue) {
+ // If this condition is equivalent to #ifndef X, and if this is the first
+ // directive seen, handle it for the multiple-include optimization.
+ if (CurLexer->getConditionalStackDepth() == 0) {
+ if (!ReadAnyTokensBeforeDirective && IfNDefMacro)
+ CurLexer->MIOpt.EnterTopLevelIFNDEF(IfNDefMacro);
+ else
+ CurLexer->MIOpt.EnterTopLevelConditional();
+ }
+
+ // Yes, remember that we are inside a conditional, then lex the next token.
+ CurLexer->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 (CurLexer->popConditionalLevel(CondInfo)) {
+ // No conditionals on the stack: this is an #endif without an #if.
+ return Diag(EndifToken, diag::err_pp_endif_without_if);
+ }
+
+ // If this the end of a top-level #endif, inform MIOpt.
+ if (CurLexer->getConditionalStackDepth() == 0)
+ CurLexer->MIOpt.ExitTopLevelConditional();
+
+ assert(!CondInfo.WasSkipping && !CurLexer->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 (CurLexer->popConditionalLevel(CI))
+ return Diag(Result, diag::pp_err_else_without_if);
+
+ // If this is a top-level #else, inform the MIOpt.
+ if (CurLexer->getConditionalStackDepth() == 0)
+ CurLexer->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 (CurLexer->popConditionalLevel(CI))
+ return Diag(ElifToken, diag::pp_err_elif_without_if);
+
+ // If this is a top-level #elif, inform the MIOpt.
+ if (CurLexer->getConditionalStackDepth() == 0)
+ CurLexer->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);
+}
+