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//===--- Arg.h - Parsed Argument Classes ------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef CLANG_DRIVER_ARG_H_
#define CLANG_DRIVER_ARG_H_
#include "llvm/Support/Casting.h"
using llvm::isa;
using llvm::cast;
using llvm::cast_or_null;
using llvm::dyn_cast;
using llvm::dyn_cast_or_null;
#include "Util.h"
namespace clang {
namespace driver {
class ArgList;
class Option;
/// Arg - A concrete instance of a particular driver option.
///
/// The Arg class encodes just enough information to be able to
/// derive the argument values efficiently. In addition, Arg
/// instances have an intrusive double linked list which is used by
/// ArgList to provide efficient iteration over all instances of a
/// particular option.
class Arg {
public:
enum ArgClass {
PositionalClass = 0,
JoinedClass,
SeparateClass,
CommaJoinedClass,
JoinedAndSeparateClass
};
private:
ArgClass Kind;
/// The option this argument is an instance of.
const Option *Opt;
/// The index at which this argument appears in the containing
/// ArgList.
unsigned Index;
protected:
Arg(ArgClass Kind, const Option *Opt, unsigned Index);
public:
Arg(const Arg &);
virtual ~Arg();
ArgClass getKind() const { return Kind; }
const Option &getOption() const { return *Opt; }
unsigned getIndex() const { return Index; }
virtual unsigned getNumValues() const = 0;
virtual const char *getValue(const ArgList &Args, unsigned N) const = 0;
/// render - Append the argument onto the given array as strings.
virtual void render(const ArgList &Args, ArgStringList &Output) const = 0;
static bool classof(const Arg *) { return true; }
void dump() const;
};
/// PositionalArg - A simple positional argument.
class PositionalArg : public Arg {
public:
PositionalArg(const Option *Opt, unsigned Index);
virtual void render(const ArgList &Args, ArgStringList &Output) const;
virtual unsigned getNumValues() const { return 1; }
virtual const char *getValue(const ArgList &Args, unsigned N) const;
static bool classof(const Arg *A) {
return A->getKind() == Arg::PositionalClass;
}
static bool classof(const PositionalArg *) { return true; }
};
/// JoinedArg - A single value argument where the value is joined
/// (suffixed) to the option.
class JoinedArg : public Arg {
public:
JoinedArg(const Option *Opt, unsigned Index);
virtual void render(const ArgList &Args, ArgStringList &Output) const;
virtual unsigned getNumValues() const { return 1; }
virtual const char *getValue(const ArgList &Args, unsigned N) const;
static bool classof(const Arg *A) {
return A->getKind() == Arg::JoinedClass;
}
static bool classof(const PositionalArg *) { return true; }
};
/// SeparateArg - An argument where one or more values follow the
/// option specifier immediately in the argument vector.
class SeparateArg : public Arg {
unsigned NumValues;
public:
SeparateArg(const Option *Opt, unsigned Index, unsigned NumValues);
virtual void render(const ArgList &Args, ArgStringList &Output) const;
virtual unsigned getNumValues() const { return NumValues; }
virtual const char *getValue(const ArgList &Args, unsigned N) const;
static bool classof(const Arg *A) {
return A->getKind() == Arg::SeparateClass;
}
static bool classof(const PositionalArg *) { return true; }
};
/// CommaJoinedArg - An argument with multiple values joined by
/// commas and joined (suffixed) to the option specifier.
///
/// The key point of this arg is that it renders its values into
/// separate arguments, which allows it to be used as a generic
/// mechanism for passing arguments through to tools.
class CommaJoinedArg : public Arg {
unsigned NumValues;
public:
CommaJoinedArg(const Option *Opt, unsigned Index, unsigned NumValues);
virtual void render(const ArgList &Args, ArgStringList &Output) const;
virtual unsigned getNumValues() const { return NumValues; }
virtual const char *getValue(const ArgList &Args, unsigned N) const;
static bool classof(const Arg *A) {
return A->getKind() == Arg::CommaJoinedClass;
}
static bool classof(const PositionalArg *) { return true; }
};
/// JoinedAndSeparateArg - An argument with both joined and separate
/// values.
class JoinedAndSeparateArg : public Arg {
public:
JoinedAndSeparateArg(const Option *Opt, unsigned Index);
virtual void render(const ArgList &Args, ArgStringList &Output) const;
virtual unsigned getNumValues() const { return 2; }
virtual const char *getValue(const ArgList &Args, unsigned N) const;
static bool classof(const Arg *A) {
return A->getKind() == Arg::JoinedAndSeparateClass;
}
static bool classof(const PositionalArg *) { return true; }
};
} // end namespace driver
} // end namespace clang
#endif
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