llvm-6502/tools/llvm-db/CLICommand.h

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//===- CLICommand.h - Classes used to represent commands --------*- 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 a small class hierarchy used to represent the various types
// of commands in the CLI debugger front-end.
//
//===----------------------------------------------------------------------===//
#ifndef CLICOMMAND_H
#define CLICOMMAND_H
#include <string>
#include <vector>
#include <cassert>
namespace llvm {
class CLIDebugger;
/// CLICommand - Base class of the hierarchy, used to provide the abstract
/// interface common to all commands.
///
class CLICommand {
/// ShortHelp, LongHelp - The short and long helps strings printed for the
/// command. The ShortHelp string should be a single line of text without a
/// newline. The LongHelp string should be a full description with
/// terminating newline.
std::string ShortHelp, LongHelp;
/// RefCount - This contains the number of entries in the CLIDebugger
/// CommandTable that points to this command.
unsigned RefCount;
/// OptionNames - This contains a list of names for the option. Keeping
/// track of this is done just to make the help output more helpful.
///
std::vector<std::string> OptionNames;
public:
CLICommand(const std::string &SH, const std::string &LH)
: ShortHelp(SH), LongHelp(LH), RefCount(0) {}
virtual ~CLICommand() {}
/// addRef/dropRef - Implement a simple reference counting scheme to make
/// sure we delete commands that are no longer used.
void addRef() { ++RefCount; }
void dropRef() {
if (--RefCount == 0) delete this;
}
/// getPrimaryOptionName - Return the first name the option was added under.
/// This is the name we report for the option in the help output.
std::string getPrimaryOptionName() const {
return OptionNames.empty() ? "" : OptionNames[0];
}
/// getOptionName - Return all of the names the option is registered as.
///
const std::vector<std::string> &getOptionNames() const {
return OptionNames;
}
/// addOptionName - Add a name that this option is known as.
///
void addOptionName(const std::string &Name) {
OptionNames.push_back(Name);
}
/// removeOptionName - Eliminate one of the names for this option.
///
void removeOptionName(const std::string &Name) {
unsigned i = 0;
for (; OptionNames[i] != Name; ++i)
assert(i+1 < OptionNames.size() && "Didn't find option name!");
OptionNames.erase(OptionNames.begin()+i);
}
/// getShortHelp - Return the short help string for this command.
///
const std::string &getShortHelp() { return ShortHelp; }
/// getLongHelp - Return the long help string for this command, if it
/// exists.
const std::string &getLongHelp() { return LongHelp; }
virtual void runCommand(CLIDebugger &D, std::string &Arguments) = 0;
};
/// BuiltinCLICommand - This class represents commands that are built directly
/// into the debugger.
class BuiltinCLICommand : public CLICommand {
// Impl - Pointer to the method that implements the command
void (CLIDebugger::*Impl)(std::string&);
public:
BuiltinCLICommand(const std::string &ShortHelp, const std::string &LongHelp,
void (CLIDebugger::*impl)(std::string&))
: CLICommand(ShortHelp, LongHelp), Impl(impl) {}
void runCommand(CLIDebugger &D, std::string &Arguments) {
(D.*Impl)(Arguments);
}
};
}
#endif