| //===--- MacroInfo.h - Information about #defined identifiers ---*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| /// |
| /// \file |
| /// \brief Defines the clang::MacroInfo and clang::MacroDirective classes. |
| /// |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_CLANG_MACROINFO_H |
| #define LLVM_CLANG_MACROINFO_H |
| |
| #include "clang/Lex/Token.h" |
| #include "llvm/ADT/SmallVector.h" |
| #include "llvm/Support/Allocator.h" |
| #include <cassert> |
| |
| namespace clang { |
| class Preprocessor; |
| |
| /// \brief Encapsulates the data about a macro definition (e.g. its tokens). |
| /// |
| /// There's an instance of this class for every #define. |
| class MacroInfo { |
| //===--------------------------------------------------------------------===// |
| // State set when the macro is defined. |
| |
| /// \brief The location the macro is defined. |
| SourceLocation Location; |
| /// \brief The location of the last token in the macro. |
| SourceLocation EndLocation; |
| |
| /// \brief The list of arguments for a function-like macro. |
| /// |
| /// ArgumentList points to the first of NumArguments pointers. |
| /// |
| /// This can be empty, for, e.g. "#define X()". In a C99-style variadic macro, this |
| /// includes the \c __VA_ARGS__ identifier on the list. |
| IdentifierInfo **ArgumentList; |
| |
| /// \see ArgumentList |
| unsigned NumArguments; |
| |
| /// \brief This is the list of tokens that the macro is defined to. |
| SmallVector<Token, 8> ReplacementTokens; |
| |
| /// \brief Length in characters of the macro definition. |
| mutable unsigned DefinitionLength; |
| mutable bool IsDefinitionLengthCached : 1; |
| |
| /// \brief True if this macro is function-like, false if it is object-like. |
| bool IsFunctionLike : 1; |
| |
| /// \brief True if this macro is of the form "#define X(...)" or |
| /// "#define X(Y,Z,...)". |
| /// |
| /// The __VA_ARGS__ token should be replaced with the contents of "..." in an |
| /// invocation. |
| bool IsC99Varargs : 1; |
| |
| /// \brief True if this macro is of the form "#define X(a...)". |
| /// |
| /// The "a" identifier in the replacement list will be replaced with all arguments |
| /// of the macro starting with the specified one. |
| bool IsGNUVarargs : 1; |
| |
| /// \brief True if this macro requires processing before expansion. |
| /// |
| /// This is the case for builtin macros such as __LINE__, so long as they have |
| /// not been redefined, but not for regular predefined macros from the "<built-in>" |
| /// memory buffer (see Preprocessing::getPredefinesFileID). |
| bool IsBuiltinMacro : 1; |
| |
| /// \brief Whether this macro contains the sequence ", ## __VA_ARGS__" |
| bool HasCommaPasting : 1; |
| |
| private: |
| //===--------------------------------------------------------------------===// |
| // State that changes as the macro is used. |
| |
| /// \brief True if we have started an expansion of this macro already. |
| /// |
| /// This disables recursive expansion, which would be quite bad for things |
| /// like \#define A A. |
| bool IsDisabled : 1; |
| |
| /// \brief True if this macro is either defined in the main file and has |
| /// been used, or if it is not defined in the main file. |
| /// |
| /// This is used to emit -Wunused-macros diagnostics. |
| bool IsUsed : 1; |
| |
| /// \brief True if this macro can be redefined without emitting a warning. |
| bool IsAllowRedefinitionsWithoutWarning : 1; |
| |
| /// \brief Must warn if the macro is unused at the end of translation unit. |
| bool IsWarnIfUnused : 1; |
| |
| /// \brief Whether this macro info was loaded from an AST file. |
| unsigned FromASTFile : 1; |
| |
| ~MacroInfo() { |
| assert(ArgumentList == 0 && "Didn't call destroy before dtor!"); |
| } |
| |
| public: |
| MacroInfo(SourceLocation DefLoc); |
| |
| /// \brief Free the argument list of the macro. |
| /// |
| /// This restores this MacroInfo to a state where it can be reused for other |
| /// devious purposes. |
| void FreeArgumentList() { |
| ArgumentList = 0; |
| NumArguments = 0; |
| } |
| |
| /// \brief Destroy this MacroInfo object. |
| void Destroy() { |
| FreeArgumentList(); |
| this->~MacroInfo(); |
| } |
| |
| /// \brief Return the location that the macro was defined at. |
| SourceLocation getDefinitionLoc() const { return Location; } |
| |
| /// \brief Set the location of the last token in the macro. |
| void setDefinitionEndLoc(SourceLocation EndLoc) { EndLocation = EndLoc; } |
| |
| /// \brief Return the location of the last token in the macro. |
| SourceLocation getDefinitionEndLoc() const { return EndLocation; } |
| |
| /// \brief Get length in characters of the macro definition. |
| unsigned getDefinitionLength(SourceManager &SM) const { |
| if (IsDefinitionLengthCached) |
| return DefinitionLength; |
| return getDefinitionLengthSlow(SM); |
| } |
| |
| /// \brief Return true if the specified macro definition is equal to |
| /// this macro in spelling, arguments, and whitespace. |
| /// |
| /// This is used to emit duplicate definition warnings. This implements the rules |
| /// in C99 6.10.3. |
| bool isIdenticalTo(const MacroInfo &Other, Preprocessor &PP) const; |
| |
| /// \brief Set or clear the isBuiltinMacro flag. |
| void setIsBuiltinMacro(bool Val = true) { |
| IsBuiltinMacro = Val; |
| } |
| |
| /// \brief Set the value of the IsUsed flag. |
| void setIsUsed(bool Val) { |
| IsUsed = Val; |
| } |
| |
| /// \brief Set the value of the IsAllowRedefinitionsWithoutWarning flag. |
| void setIsAllowRedefinitionsWithoutWarning(bool Val) { |
| IsAllowRedefinitionsWithoutWarning = Val; |
| } |
| |
| /// \brief Set the value of the IsWarnIfUnused flag. |
| void setIsWarnIfUnused(bool val) { |
| IsWarnIfUnused = val; |
| } |
| |
| /// \brief Set the specified list of identifiers as the argument list for |
| /// this macro. |
| void setArgumentList(IdentifierInfo* const *List, unsigned NumArgs, |
| llvm::BumpPtrAllocator &PPAllocator) { |
| assert(ArgumentList == 0 && NumArguments == 0 && |
| "Argument list already set!"); |
| if (NumArgs == 0) return; |
| |
| NumArguments = NumArgs; |
| ArgumentList = PPAllocator.Allocate<IdentifierInfo*>(NumArgs); |
| for (unsigned i = 0; i != NumArgs; ++i) |
| ArgumentList[i] = List[i]; |
| } |
| |
| /// Arguments - The list of arguments for a function-like macro. This can be |
| /// empty, for, e.g. "#define X()". |
| typedef IdentifierInfo* const *arg_iterator; |
| bool arg_empty() const { return NumArguments == 0; } |
| arg_iterator arg_begin() const { return ArgumentList; } |
| arg_iterator arg_end() const { return ArgumentList+NumArguments; } |
| unsigned getNumArgs() const { return NumArguments; } |
| |
| /// \brief Return the argument number of the specified identifier, |
| /// or -1 if the identifier is not a formal argument identifier. |
| int getArgumentNum(IdentifierInfo *Arg) const { |
| for (arg_iterator I = arg_begin(), E = arg_end(); I != E; ++I) |
| if (*I == Arg) return I-arg_begin(); |
| return -1; |
| } |
| |
| /// Function/Object-likeness. Keep track of whether this macro has formal |
| /// parameters. |
| void setIsFunctionLike() { IsFunctionLike = true; } |
| bool isFunctionLike() const { return IsFunctionLike; } |
| bool isObjectLike() const { return !IsFunctionLike; } |
| |
| /// Varargs querying methods. This can only be set for function-like macros. |
| void setIsC99Varargs() { IsC99Varargs = true; } |
| void setIsGNUVarargs() { IsGNUVarargs = true; } |
| bool isC99Varargs() const { return IsC99Varargs; } |
| bool isGNUVarargs() const { return IsGNUVarargs; } |
| bool isVariadic() const { return IsC99Varargs | IsGNUVarargs; } |
| |
| /// \brief Return true if this macro requires processing before expansion. |
| /// |
| /// This is true only for builtin macro, such as \__LINE__, whose values |
| /// are not given by fixed textual expansions. Regular predefined macros |
| /// from the "<built-in>" buffer are not reported as builtins by this |
| /// function. |
| bool isBuiltinMacro() const { return IsBuiltinMacro; } |
| |
| bool hasCommaPasting() const { return HasCommaPasting; } |
| void setHasCommaPasting() { HasCommaPasting = true; } |
| |
| /// \brief Return false if this macro is defined in the main file and has |
| /// not yet been used. |
| bool isUsed() const { return IsUsed; } |
| |
| /// \brief Return true if this macro can be redefined without warning. |
| bool isAllowRedefinitionsWithoutWarning() const { |
| return IsAllowRedefinitionsWithoutWarning; |
| } |
| |
| /// \brief Return true if we should emit a warning if the macro is unused. |
| bool isWarnIfUnused() const { |
| return IsWarnIfUnused; |
| } |
| |
| /// \brief Return the number of tokens that this macro expands to. |
| /// |
| unsigned getNumTokens() const { |
| return ReplacementTokens.size(); |
| } |
| |
| const Token &getReplacementToken(unsigned Tok) const { |
| assert(Tok < ReplacementTokens.size() && "Invalid token #"); |
| return ReplacementTokens[Tok]; |
| } |
| |
| typedef SmallVector<Token, 8>::const_iterator tokens_iterator; |
| tokens_iterator tokens_begin() const { return ReplacementTokens.begin(); } |
| tokens_iterator tokens_end() const { return ReplacementTokens.end(); } |
| bool tokens_empty() const { return ReplacementTokens.empty(); } |
| |
| /// \brief Add the specified token to the replacement text for the macro. |
| void AddTokenToBody(const Token &Tok) { |
| assert(!IsDefinitionLengthCached && |
| "Changing replacement tokens after definition length got calculated"); |
| ReplacementTokens.push_back(Tok); |
| } |
| |
| /// \brief Return true if this macro is enabled. |
| /// |
| /// In other words, that we are not currently in an expansion of this macro. |
| bool isEnabled() const { return !IsDisabled; } |
| |
| void EnableMacro() { |
| assert(IsDisabled && "Cannot enable an already-enabled macro!"); |
| IsDisabled = false; |
| } |
| |
| void DisableMacro() { |
| assert(!IsDisabled && "Cannot disable an already-disabled macro!"); |
| IsDisabled = true; |
| } |
| |
| /// \brief Determine whether this macro info came from an AST file (such as |
| /// a precompiled header or module) rather than having been parsed. |
| bool isFromASTFile() const { return FromASTFile; } |
| |
| /// \brief Retrieve the global ID of the module that owns this particular |
| /// macro info. |
| unsigned getOwningModuleID() const { |
| if (isFromASTFile()) |
| return *(const unsigned*)(this+1); |
| |
| return 0; |
| } |
| |
| private: |
| unsigned getDefinitionLengthSlow(SourceManager &SM) const; |
| |
| void setOwningModuleID(unsigned ID) { |
| assert(isFromASTFile()); |
| *(unsigned*)(this+1) = ID; |
| } |
| |
| friend class Preprocessor; |
| }; |
| |
| /// \brief Encapsulates changes to the "macros namespace" (the location where |
| /// the macro name became active, the location where it was undefined, etc.). |
| /// |
| /// MacroDirectives, associated with an identifier, are used to model the macro |
| /// history. Usually a macro definition (MacroInfo) is where a macro name |
| /// becomes active (MacroDirective) but modules can have their own macro |
| /// history, separate from the local (current translation unit) macro history. |
| /// |
| /// For example, if "@import A;" imports macro FOO, there will be a new local |
| /// MacroDirective created to indicate that "FOO" became active at the import |
| /// location. Module "A" itself will contain another MacroDirective in its macro |
| /// history (at the point of the definition of FOO) and both MacroDirectives |
| /// will point to the same MacroInfo object. |
| /// |
| class MacroDirective { |
| MacroInfo *Info; |
| |
| /// \brief Previous definition, the identifier of this macro was defined to, |
| /// or NULL. |
| MacroDirective *Previous; |
| |
| SourceLocation Loc; |
| |
| /// \brief The location where the macro was #undef'd, or an invalid location |
| /// for macros that haven't been undefined. |
| SourceLocation UndefLocation; |
| |
| /// \brief The location at which this macro was either explicitly exported |
| /// from its module or marked as private. |
| /// |
| /// If invalid, this macro has not been explicitly given any visibility. |
| SourceLocation VisibilityLocation; |
| |
| /// \brief True if the macro directive was loaded from a PCH file. |
| bool IsFromPCH : 1; |
| |
| /// \brief True if this macro was imported from a module. |
| bool IsImported : 1; |
| |
| /// \brief Whether the macro has public (when described in a module). |
| bool IsPublic : 1; |
| |
| /// \brief Whether the macro definition is currently "hidden". |
| /// |
| /// Note that this is transient state that is never serialized to the AST |
| /// file. |
| bool IsHidden : 1; |
| |
| /// \brief Whether the definition of this macro is ambiguous, due to |
| /// multiple definitions coming in from multiple modules. |
| bool IsAmbiguous : 1; |
| |
| /// \brief Whether this macro changed after it was loaded from an AST file. |
| bool ChangedAfterLoad : 1; |
| |
| public: |
| explicit MacroDirective(MacroInfo *MI) |
| : Info(MI), Previous(0), Loc(MI->getDefinitionLoc()), |
| IsFromPCH(false), IsImported(false), IsPublic(true), IsHidden(false), |
| IsAmbiguous(false), ChangedAfterLoad(false) { |
| assert(MI && "MacroInfo is null"); |
| } |
| |
| MacroDirective(MacroInfo *MI, SourceLocation Loc, bool isImported) |
| : Info(MI), Previous(0), Loc(Loc), |
| IsFromPCH(false), IsImported(isImported), IsPublic(true), IsHidden(false), |
| IsAmbiguous(false), ChangedAfterLoad(false) { |
| assert(MI && "MacroInfo is null"); |
| } |
| |
| SourceLocation getLocation() const { return Loc; } |
| |
| /// \brief Set the location where macro was undefined. Can only be set once. |
| void setUndefLoc(SourceLocation UndefLoc) { |
| assert(UndefLocation.isInvalid() && "UndefLocation is already set!"); |
| assert(UndefLoc.isValid() && "Invalid UndefLoc!"); |
| UndefLocation = UndefLoc; |
| } |
| |
| /// \brief The data for the macro definition. |
| const MacroInfo *getInfo() const { return Info; } |
| MacroInfo *getInfo() { return Info; } |
| |
| /// \brief Get the location where macro was undefined. |
| SourceLocation getUndefLoc() const { return UndefLocation; } |
| |
| /// \brief Set previous definition of the macro with the same name. |
| void setPrevious(MacroDirective *Prev) { |
| Previous = Prev; |
| } |
| |
| /// \brief Get previous definition of the macro with the same name. |
| const MacroDirective *getPrevious() const { return Previous; } |
| |
| /// \brief Get previous definition of the macro with the same name. |
| MacroDirective *getPrevious() { return Previous; } |
| |
| /// \brief Find macro definition active in the specified source location. If |
| /// this macro was not defined there, return NULL. |
| const MacroDirective *findDirectiveAtLoc(SourceLocation L, |
| SourceManager &SM) const; |
| |
| /// \brief Set the export location for this macro. |
| void setVisibility(bool Public, SourceLocation Loc) { |
| VisibilityLocation = Loc; |
| IsPublic = Public; |
| } |
| |
| /// \brief Determine whether this macro is part of the public API of its |
| /// module. |
| bool isPublic() const { return IsPublic; } |
| |
| /// \brief Determine the location where this macro was explicitly made |
| /// public or private within its module. |
| SourceLocation getVisibilityLocation() const { return VisibilityLocation; } |
| |
| /// \brief Return true if the macro directive was loaded from a PCH file. |
| bool isFromPCH() const { return IsFromPCH; } |
| |
| void setIsFromPCH() { IsFromPCH = true; } |
| |
| /// \brief True if this macro was imported from a module. |
| bool isImported() const { return IsImported; } |
| |
| /// \brief Determine whether this macro is currently defined (and has not |
| /// been #undef'd) or has been hidden. |
| bool isDefined() const { return UndefLocation.isInvalid() && !IsHidden; } |
| |
| /// \brief Determine whether this macro definition is hidden. |
| bool isHidden() const { return IsHidden; } |
| |
| /// \brief Set whether this macro definition is hidden. |
| void setHidden(bool Val) { IsHidden = Val; } |
| |
| /// \brief Determine whether this macro definition is ambiguous with |
| /// other macro definitions. |
| bool isAmbiguous() const { return IsAmbiguous; } |
| |
| /// \brief Set whether this macro definition is ambiguous. |
| void setAmbiguous(bool Val) { IsAmbiguous = Val; } |
| |
| /// \brief Determine whether this macro has changed since it was loaded from |
| /// an AST file. |
| bool hasChangedAfterLoad() const { return ChangedAfterLoad; } |
| |
| /// \brief Note whether this macro has changed after it was loaded from an |
| /// AST file. |
| void setChangedAfterLoad(bool CAL = true) { ChangedAfterLoad = CAL; } |
| }; |
| |
| } // end namespace clang |
| |
| #endif |