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