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-//===--- MacroArgs.h - Formal argument info for Macros ----------*- C++ -*-===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file defines the MacroArgs interface.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_CLANG_MACROARGS_H
-#define LLVM_CLANG_MACROARGS_H
-
-#include "clang/Basic/LLVM.h"
-#include "llvm/ADT/ArrayRef.h"
-#include <vector>
-
-namespace clang {
- class MacroInfo;
- class Preprocessor;
- class Token;
- class SourceLocation;
-
-/// MacroArgs - An instance of this class captures information about
-/// the formal arguments specified to a function-like macro invocation.
-class MacroArgs {
- /// NumUnexpArgTokens - The number of raw, unexpanded tokens for the
- /// arguments. All of the actual argument tokens are allocated immediately
- /// after the MacroArgs object in memory. This is all of the arguments
- /// concatenated together, with 'EOF' markers at the end of each argument.
- unsigned NumUnexpArgTokens;
-
- /// VarargsElided - True if this is a C99 style varargs macro invocation and
- /// there was no argument specified for the "..." argument. If the argument
- /// was specified (even empty) or this isn't a C99 style varargs function, or
- /// if in strict mode and the C99 varargs macro had only a ... argument, this
- /// is false.
- bool VarargsElided;
-
- /// PreExpArgTokens - Pre-expanded tokens for arguments that need them. Empty
- /// if not yet computed. This includes the EOF marker at the end of the
- /// stream.
- std::vector<std::vector<Token> > PreExpArgTokens;
-
- /// StringifiedArgs - This contains arguments in 'stringified' form. If the
- /// stringified form of an argument has not yet been computed, this is empty.
- std::vector<Token> StringifiedArgs;
-
- /// ArgCache - This is a linked list of MacroArgs objects that the
- /// Preprocessor owns which we use to avoid thrashing malloc/free.
- MacroArgs *ArgCache;
-
- MacroArgs(unsigned NumToks, bool varargsElided)
- : NumUnexpArgTokens(NumToks), VarargsElided(varargsElided), ArgCache(0) {}
- ~MacroArgs() {}
-public:
- /// MacroArgs ctor function - Create a new MacroArgs object with the specified
- /// macro and argument info.
- static MacroArgs *create(const MacroInfo *MI,
- ArrayRef<Token> UnexpArgTokens,
- bool VarargsElided, Preprocessor &PP);
-
- /// destroy - Destroy and deallocate the memory for this object.
- ///
- void destroy(Preprocessor &PP);
-
- /// ArgNeedsPreexpansion - If we can prove that the argument won't be affected
- /// by pre-expansion, return false. Otherwise, conservatively return true.
- bool ArgNeedsPreexpansion(const Token *ArgTok, Preprocessor &PP) const;
-
- /// getUnexpArgument - Return a pointer to the first token of the unexpanded
- /// token list for the specified formal.
- ///
- const Token *getUnexpArgument(unsigned Arg) const;
-
- /// getArgLength - Given a pointer to an expanded or unexpanded argument,
- /// return the number of tokens, not counting the EOF, that make up the
- /// argument.
- static unsigned getArgLength(const Token *ArgPtr);
-
- /// getPreExpArgument - Return the pre-expanded form of the specified
- /// argument.
- const std::vector<Token> &
- getPreExpArgument(unsigned Arg, const MacroInfo *MI, Preprocessor &PP);
-
- /// getStringifiedArgument - Compute, cache, and return the specified argument
- /// that has been 'stringified' as required by the # operator.
- const Token &getStringifiedArgument(unsigned ArgNo, Preprocessor &PP,
- SourceLocation ExpansionLocStart,
- SourceLocation ExpansionLocEnd);
-
- /// getNumArguments - Return the number of arguments passed into this macro
- /// invocation.
- unsigned getNumArguments() const { return NumUnexpArgTokens; }
-
-
- /// isVarargsElidedUse - Return true if this is a C99 style varargs macro
- /// invocation and there was no argument specified for the "..." argument. If
- /// the argument was specified (even empty) or this isn't a C99 style varargs
- /// function, or if in strict mode and the C99 varargs macro had only a ...
- /// argument, this returns false.
- bool isVarargsElidedUse() const { return VarargsElided; }
-
- /// StringifyArgument - Implement C99 6.10.3.2p2, converting a sequence of
- /// tokens into the literal string token that should be produced by the C #
- /// preprocessor operator. If Charify is true, then it should be turned into
- /// a character literal for the Microsoft charize (#@) extension.
- ///
- static Token StringifyArgument(const Token *ArgToks,
- Preprocessor &PP, bool Charify,
- SourceLocation ExpansionLocStart,
- SourceLocation ExpansionLocEnd);
-
-
- /// deallocate - This should only be called by the Preprocessor when managing
- /// its freelist.
- MacroArgs *deallocate();
-};
-
-} // end namespace clang
-
-#endif
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