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 /// ReplacementTokens - This is the list of tokens that the macro is defined
44 llvm::SmallVector<Token, 8> ReplacementTokens;
46 /// \brief Length in characters of the macro definition.
47 mutable unsigned DefinitionLength;
48 mutable bool IsDefinitionLengthCached : 1;
50 /// IsFunctionLike - True if this macro is a function-like macro, false if it
51 /// is an object-like macro.
52 bool IsFunctionLike : 1;
54 /// IsC99Varargs - True if this macro is of the form "#define X(...)" or
55 /// "#define X(Y,Z,...)". The __VA_ARGS__ token should be replaced with the
56 /// contents of "..." in an invocation.
57 bool IsC99Varargs : 1;
59 /// IsGNUVarargs - True if this macro is of the form "#define X(a...)". The
60 /// "a" identifier in the replacement list will be replaced with all arguments
61 /// of the macro starting with the specified one.
62 bool IsGNUVarargs : 1;
64 /// IsBuiltinMacro - True if this is a builtin macro, such as __LINE__, and if
65 /// it has not yet been redefined or undefined.
66 bool IsBuiltinMacro : 1;
68 /// IsFromAST - True if this macro was loaded from an AST file.
72 //===--------------------------------------------------------------------===//
73 // State that changes as the macro is used.
75 /// IsDisabled - True if we have started an expansion of this macro already.
76 /// This disbles recursive expansion, which would be quite bad for things like
80 /// IsUsed - True if this macro is either defined in the main file and has
81 /// been used, or if it is not defined in the main file. This is used to
82 /// emit -Wunused-macros diagnostics.
85 /// AllowRedefinitionsWithoutWarning - True if this macro can be redefined
86 /// without emitting a warning.
87 bool IsAllowRedefinitionsWithoutWarning : 1;
89 /// \brief Must warn if the macro is unused at the end of translation unit.
90 bool IsWarnIfUnused : 1;
93 assert(ArgumentList == 0 && "Didn't call destroy before dtor!");
97 MacroInfo(SourceLocation DefLoc);
98 MacroInfo(const MacroInfo &MI, llvm::BumpPtrAllocator &PPAllocator);
100 /// FreeArgumentList - Free the argument list of the macro, restoring it to a
101 /// state where it can be reused for other devious purposes.
102 void FreeArgumentList() {
107 /// Destroy - destroy this MacroInfo object.
113 /// getDefinitionLoc - Return the location that the macro was defined at.
115 SourceLocation getDefinitionLoc() const { return Location; }
117 /// setDefinitionEndLoc - Set the location of the last token in the macro.
119 void setDefinitionEndLoc(SourceLocation EndLoc) { EndLocation = EndLoc; }
120 /// getDefinitionEndLoc - Return the location of the last token in the macro.
122 SourceLocation getDefinitionEndLoc() const { return EndLocation; }
124 /// \brief Get length in characters of the macro definition.
125 unsigned getDefinitionLength(SourceManager &SM) const {
126 if (IsDefinitionLengthCached)
127 return DefinitionLength;
128 return getDefinitionLengthSlow(SM);
131 /// isIdenticalTo - Return true if the specified macro definition is equal to
132 /// this macro in spelling, arguments, and whitespace. This is used to emit
133 /// duplicate definition warnings. This implements the rules in C99 6.10.3.
134 bool isIdenticalTo(const MacroInfo &Other, Preprocessor &PP) const;
136 /// setIsBuiltinMacro - Set or clear the isBuiltinMacro flag.
138 void setIsBuiltinMacro(bool Val = true) {
139 IsBuiltinMacro = Val;
142 /// setIsUsed - Set the value of the IsUsed flag.
144 void setIsUsed(bool Val) {
148 /// setIsAllowRedefinitionsWithoutWarning - Set the value of the
149 /// IsAllowRedefinitionsWithoutWarning flag.
150 void setIsAllowRedefinitionsWithoutWarning(bool Val) {
151 IsAllowRedefinitionsWithoutWarning = Val;
154 /// \brief Set the value of the IsWarnIfUnused flag.
155 void setIsWarnIfUnused(bool val) {
156 IsWarnIfUnused = val;
159 /// setArgumentList - Set the specified list of identifiers as the argument
160 /// list for this macro.
161 void setArgumentList(IdentifierInfo* const *List, unsigned NumArgs,
162 llvm::BumpPtrAllocator &PPAllocator) {
163 assert(ArgumentList == 0 && NumArguments == 0 &&
164 "Argument list already set!");
165 if (NumArgs == 0) return;
167 NumArguments = NumArgs;
168 ArgumentList = PPAllocator.Allocate<IdentifierInfo*>(NumArgs);
169 for (unsigned i = 0; i != NumArgs; ++i)
170 ArgumentList[i] = List[i];
173 /// Arguments - The list of arguments for a function-like macro. This can be
174 /// empty, for, e.g. "#define X()".
175 typedef IdentifierInfo* const *arg_iterator;
176 bool arg_empty() const { return NumArguments == 0; }
177 arg_iterator arg_begin() const { return ArgumentList; }
178 arg_iterator arg_end() const { return ArgumentList+NumArguments; }
179 unsigned getNumArgs() const { return NumArguments; }
181 /// getArgumentNum - Return the argument number of the specified identifier,
182 /// or -1 if the identifier is not a formal argument identifier.
183 int getArgumentNum(IdentifierInfo *Arg) const {
184 for (arg_iterator I = arg_begin(), E = arg_end(); I != E; ++I)
185 if (*I == Arg) return I-arg_begin();
189 /// Function/Object-likeness. Keep track of whether this macro has formal
191 void setIsFunctionLike() { IsFunctionLike = true; }
192 bool isFunctionLike() const { return IsFunctionLike; }
193 bool isObjectLike() const { return !IsFunctionLike; }
195 /// Varargs querying methods. This can only be set for function-like macros.
196 void setIsC99Varargs() { IsC99Varargs = true; }
197 void setIsGNUVarargs() { IsGNUVarargs = true; }
198 bool isC99Varargs() const { return IsC99Varargs; }
199 bool isGNUVarargs() const { return IsGNUVarargs; }
200 bool isVariadic() const { return IsC99Varargs | IsGNUVarargs; }
202 /// isBuiltinMacro - Return true if this macro is a builtin macro, such as
203 /// __LINE__, which requires processing before expansion.
204 bool isBuiltinMacro() const { return IsBuiltinMacro; }
206 /// isFromAST - Return true if this macro was loaded from an AST file.
207 bool isFromAST() const { return IsFromAST; }
209 /// setIsFromAST - Set whether this macro was loaded from an AST file.
210 void setIsFromAST(bool FromAST = true) { IsFromAST = FromAST; }
212 /// isUsed - Return false if this macro is defined in the main file and has
213 /// not yet been used.
214 bool isUsed() const { return IsUsed; }
216 /// isAllowRedefinitionsWithoutWarning - Return true if this macro can be
217 /// redefined without warning.
218 bool isAllowRedefinitionsWithoutWarning() const {
219 return IsAllowRedefinitionsWithoutWarning;
222 /// \brief Return true if we should emit a warning if the macro is unused.
223 bool isWarnIfUnused() const {
224 return IsWarnIfUnused;
227 /// getNumTokens - Return the number of tokens that this macro expands to.
229 unsigned getNumTokens() const {
230 return ReplacementTokens.size();
233 const Token &getReplacementToken(unsigned Tok) const {
234 assert(Tok < ReplacementTokens.size() && "Invalid token #");
235 return ReplacementTokens[Tok];
238 typedef llvm::SmallVector<Token, 8>::const_iterator tokens_iterator;
239 tokens_iterator tokens_begin() const { return ReplacementTokens.begin(); }
240 tokens_iterator tokens_end() const { return ReplacementTokens.end(); }
241 bool tokens_empty() const { return ReplacementTokens.empty(); }
243 /// AddTokenToBody - Add the specified token to the replacement text for the
245 void AddTokenToBody(const Token &Tok) {
246 assert(!IsDefinitionLengthCached &&
247 "Changing replacement tokens after definition length got calculated");
248 ReplacementTokens.push_back(Tok);
251 /// isEnabled - Return true if this macro is enabled: in other words, that we
252 /// are not currently in an expansion of this macro.
253 bool isEnabled() const { return !IsDisabled; }
256 assert(IsDisabled && "Cannot enable an already-enabled macro!");
260 void DisableMacro() {
261 assert(!IsDisabled && "Cannot disable an already-disabled macro!");
266 unsigned getDefinitionLengthSlow(SourceManager &SM) const;
269 } // end namespace clang