1 //===--- MacroInfo.h - Information about #defined identifiers ---*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the MacroInfo interface.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CLANG_MACROINFO_H
15 #define LLVM_CLANG_MACROINFO_H
17 #include "clang/Lex/Token.h"
18 #include "llvm/ADT/SmallVector.h"
19 #include "llvm/Support/Allocator.h"
25 /// MacroInfo - Each identifier that is #define'd has an instance of this class
26 /// associated with it, used to implement macro expansion.
28 //===--------------------------------------------------------------------===//
29 // State set when the macro is defined.
31 /// Location - This is the place the macro is defined.
32 SourceLocation Location;
33 /// EndLocation - The location of the last token in the macro.
34 SourceLocation EndLocation;
36 /// Arguments - The list of arguments for a function-like macro. This can be
37 /// empty, for, e.g. "#define X()". In a C99-style variadic macro, this
38 /// includes the __VA_ARGS__ identifier on the list.
39 IdentifierInfo **ArgumentList;
40 unsigned NumArguments;
42 /// \brief The location at which this macro was either explicitly exported
43 /// from its module or marked as private.
45 /// If invalid, this macro has not been explicitly given any visibility.
46 SourceLocation VisibilityLocation;
48 /// ReplacementTokens - This is the list of tokens that the macro is defined
50 SmallVector<Token, 8> ReplacementTokens;
52 /// \brief Length in characters of the macro definition.
53 mutable unsigned DefinitionLength;
54 mutable bool IsDefinitionLengthCached : 1;
56 /// IsFunctionLike - True if this macro is a function-like macro, false if it
57 /// is an object-like macro.
58 bool IsFunctionLike : 1;
60 /// IsC99Varargs - True if this macro is of the form "#define X(...)" or
61 /// "#define X(Y,Z,...)". The __VA_ARGS__ token should be replaced with the
62 /// contents of "..." in an invocation.
63 bool IsC99Varargs : 1;
65 /// IsGNUVarargs - True if this macro is of the form "#define X(a...)". The
66 /// "a" identifier in the replacement list will be replaced with all arguments
67 /// of the macro starting with the specified one.
68 bool IsGNUVarargs : 1;
70 /// IsBuiltinMacro - True if this is a builtin macro, such as __LINE__, and if
71 /// it has not yet been redefined or undefined.
72 bool IsBuiltinMacro : 1;
74 /// IsFromAST - True if this macro was loaded from an AST file.
77 /// \brief Whether this macro changed after it was loaded from an AST file.
78 bool ChangedAfterLoad : 1;
81 //===--------------------------------------------------------------------===//
82 // State that changes as the macro is used.
84 /// IsDisabled - True if we have started an expansion of this macro already.
85 /// This disbles recursive expansion, which would be quite bad for things like
89 /// IsUsed - True if this macro is either defined in the main file and has
90 /// been used, or if it is not defined in the main file. This is used to
91 /// emit -Wunused-macros diagnostics.
94 /// AllowRedefinitionsWithoutWarning - True if this macro can be redefined
95 /// without emitting a warning.
96 bool IsAllowRedefinitionsWithoutWarning : 1;
98 /// \brief Must warn if the macro is unused at the end of translation unit.
99 bool IsWarnIfUnused : 1;
101 /// \brief Whether the macro has public (when described in a module).
105 assert(ArgumentList == 0 && "Didn't call destroy before dtor!");
109 MacroInfo(SourceLocation DefLoc);
110 MacroInfo(const MacroInfo &MI, llvm::BumpPtrAllocator &PPAllocator);
112 /// FreeArgumentList - Free the argument list of the macro, restoring it to a
113 /// state where it can be reused for other devious purposes.
114 void FreeArgumentList() {
119 /// Destroy - destroy this MacroInfo object.
125 /// getDefinitionLoc - Return the location that the macro was defined at.
127 SourceLocation getDefinitionLoc() const { return Location; }
129 /// setDefinitionEndLoc - Set the location of the last token in the macro.
131 void setDefinitionEndLoc(SourceLocation EndLoc) { EndLocation = EndLoc; }
132 /// getDefinitionEndLoc - Return the location of the last token in the macro.
134 SourceLocation getDefinitionEndLoc() const { return EndLocation; }
136 /// \brief Get length in characters of the macro definition.
137 unsigned getDefinitionLength(SourceManager &SM) const {
138 if (IsDefinitionLengthCached)
139 return DefinitionLength;
140 return getDefinitionLengthSlow(SM);
143 /// isIdenticalTo - Return true if the specified macro definition is equal to
144 /// this macro in spelling, arguments, and whitespace. This is used to emit
145 /// duplicate definition warnings. This implements the rules in C99 6.10.3.
146 bool isIdenticalTo(const MacroInfo &Other, Preprocessor &PP) const;
148 /// setIsBuiltinMacro - Set or clear the isBuiltinMacro flag.
150 void setIsBuiltinMacro(bool Val = true) {
151 IsBuiltinMacro = Val;
154 /// setIsUsed - Set the value of the IsUsed flag.
156 void setIsUsed(bool Val) {
160 /// setIsAllowRedefinitionsWithoutWarning - Set the value of the
161 /// IsAllowRedefinitionsWithoutWarning flag.
162 void setIsAllowRedefinitionsWithoutWarning(bool Val) {
163 IsAllowRedefinitionsWithoutWarning = Val;
166 /// \brief Set the value of the IsWarnIfUnused flag.
167 void setIsWarnIfUnused(bool val) {
168 IsWarnIfUnused = val;
171 /// setArgumentList - Set the specified list of identifiers as the argument
172 /// list for this macro.
173 void setArgumentList(IdentifierInfo* const *List, unsigned NumArgs,
174 llvm::BumpPtrAllocator &PPAllocator) {
175 assert(ArgumentList == 0 && NumArguments == 0 &&
176 "Argument list already set!");
177 if (NumArgs == 0) return;
179 NumArguments = NumArgs;
180 ArgumentList = PPAllocator.Allocate<IdentifierInfo*>(NumArgs);
181 for (unsigned i = 0; i != NumArgs; ++i)
182 ArgumentList[i] = List[i];
185 /// Arguments - The list of arguments for a function-like macro. This can be
186 /// empty, for, e.g. "#define X()".
187 typedef IdentifierInfo* const *arg_iterator;
188 bool arg_empty() const { return NumArguments == 0; }
189 arg_iterator arg_begin() const { return ArgumentList; }
190 arg_iterator arg_end() const { return ArgumentList+NumArguments; }
191 unsigned getNumArgs() const { return NumArguments; }
193 /// getArgumentNum - Return the argument number of the specified identifier,
194 /// or -1 if the identifier is not a formal argument identifier.
195 int getArgumentNum(IdentifierInfo *Arg) const {
196 for (arg_iterator I = arg_begin(), E = arg_end(); I != E; ++I)
197 if (*I == Arg) return I-arg_begin();
201 /// Function/Object-likeness. Keep track of whether this macro has formal
203 void setIsFunctionLike() { IsFunctionLike = true; }
204 bool isFunctionLike() const { return IsFunctionLike; }
205 bool isObjectLike() const { return !IsFunctionLike; }
207 /// Varargs querying methods. This can only be set for function-like macros.
208 void setIsC99Varargs() { IsC99Varargs = true; }
209 void setIsGNUVarargs() { IsGNUVarargs = true; }
210 bool isC99Varargs() const { return IsC99Varargs; }
211 bool isGNUVarargs() const { return IsGNUVarargs; }
212 bool isVariadic() const { return IsC99Varargs | IsGNUVarargs; }
214 /// isBuiltinMacro - Return true if this macro is a builtin macro, such as
215 /// __LINE__, which requires processing before expansion.
216 bool isBuiltinMacro() const { return IsBuiltinMacro; }
218 /// isFromAST - Return true if this macro was loaded from an AST file.
219 bool isFromAST() const { return IsFromAST; }
221 /// setIsFromAST - Set whether this macro was loaded from an AST file.
222 void setIsFromAST(bool FromAST = true) { IsFromAST = FromAST; }
224 /// \brief Determine whether this macro has changed since it was loaded from
226 bool hasChangedAfterLoad() const { return ChangedAfterLoad; }
228 /// \brief Note whether this macro has changed after it was loaded from an
230 void setChangedAfterLoad(bool CAL = true) { ChangedAfterLoad = CAL; }
232 /// isUsed - Return false if this macro is defined in the main file and has
233 /// not yet been used.
234 bool isUsed() const { return IsUsed; }
236 /// isAllowRedefinitionsWithoutWarning - Return true if this macro can be
237 /// redefined without warning.
238 bool isAllowRedefinitionsWithoutWarning() const {
239 return IsAllowRedefinitionsWithoutWarning;
242 /// \brief Return true if we should emit a warning if the macro is unused.
243 bool isWarnIfUnused() const {
244 return IsWarnIfUnused;
247 /// getNumTokens - Return the number of tokens that this macro expands to.
249 unsigned getNumTokens() const {
250 return ReplacementTokens.size();
253 const Token &getReplacementToken(unsigned Tok) const {
254 assert(Tok < ReplacementTokens.size() && "Invalid token #");
255 return ReplacementTokens[Tok];
258 typedef SmallVector<Token, 8>::const_iterator tokens_iterator;
259 tokens_iterator tokens_begin() const { return ReplacementTokens.begin(); }
260 tokens_iterator tokens_end() const { return ReplacementTokens.end(); }
261 bool tokens_empty() const { return ReplacementTokens.empty(); }
263 /// AddTokenToBody - Add the specified token to the replacement text for the
265 void AddTokenToBody(const Token &Tok) {
266 assert(!IsDefinitionLengthCached &&
267 "Changing replacement tokens after definition length got calculated");
268 ReplacementTokens.push_back(Tok);
271 /// isEnabled - Return true if this macro is enabled: in other words, that we
272 /// are not currently in an expansion of this macro.
273 bool isEnabled() const { return !IsDisabled; }
276 assert(IsDisabled && "Cannot enable an already-enabled macro!");
280 void DisableMacro() {
281 assert(!IsDisabled && "Cannot disable an already-disabled macro!");
285 /// \brief Set the export location for this macro.
286 void setVisibility(bool Public, SourceLocation Loc) {
287 VisibilityLocation = Loc;
291 /// \brief Determine whether this macro is part of the public API of its
293 bool isPublic() const { return IsPublic; }
295 /// \brief Determine the location where this macro was explicitly made
296 /// public or private within its module.
297 SourceLocation getVisibilityLocation() { return VisibilityLocation; }
300 unsigned getDefinitionLengthSlow(SourceManager &SM) const;
303 } // end namespace clang