tools/llvm-db/CLICommand.h

   1 //===- CLICommand.h - Classes used to represent commands --------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file defines a small class hierarchy used to represent the various types
  11 // of commands in the CLI debugger front-end.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #ifndef CLICOMMAND_H
  16 #define CLICOMMAND_H
  17
  18 #include <string>
  19 #include <vector>
  20 #include <cassert>
  21
  22 namespace llvm {
  23   class CLIDebugger;
  24
  25   /// CLICommand - Base class of the hierarchy, used to provide the abstract
  26   /// interface common to all commands.
  27   ///
  28   class CLICommand {
  29     /// ShortHelp, LongHelp - The short and long helps strings printed for the
  30     /// command.  The ShortHelp string should be a single line of text without a
  31     /// newline.  The LongHelp string should be a full description with
  32     /// terminating newline.
  33     std::string ShortHelp, LongHelp;
  34
  35     /// RefCount - This contains the number of entries in the CLIDebugger
  36     /// CommandTable that points to this command.
  37     unsigned RefCount;
  38
  39     /// OptionNames - This contains a list of names for the option.  Keeping
  40     /// track of this is done just to make the help output more helpful.
  41     ///
  42     std::vector<std::string> OptionNames;
  43   public:
  44     CLICommand(const std::string &SH, const std::string &LH)
  45       : ShortHelp(SH), LongHelp(LH), RefCount(0) {}
  46
  47     virtual ~CLICommand() {}
  48
  49     /// addRef/dropRef - Implement a simple reference counting scheme to make
  50     /// sure we delete commands that are no longer used.
  51     void addRef() { ++RefCount; }
  52     void dropRef() {
  53       if (--RefCount == 0) delete this;
  54     }
  55
  56     /// getPrimaryOptionName - Return the first name the option was added under.
  57     /// This is the name we report for the option in the help output.
  58     std::string getPrimaryOptionName() const {
  59       return OptionNames.empty() ? "" : OptionNames[0];
  60     }
  61
  62     /// getOptionName - Return all of the names the option is registered as.
  63     ///
  64     const std::vector<std::string> &getOptionNames() const {
  65       return OptionNames;
  66     }
  67
  68     /// addOptionName - Add a name that this option is known as.
  69     ///
  70     void addOptionName(const std::string &Name) {
  71       OptionNames.push_back(Name);
  72     }
  73
  74     /// removeOptionName - Eliminate one of the names for this option.
  75     ///
  76     void removeOptionName(const std::string &Name) {
  77       unsigned i = 0;
  78       for (; OptionNames[i] != Name; ++i)
  79         assert(i+1 < OptionNames.size() && "Didn't find option name!");
  80       OptionNames.erase(OptionNames.begin()+i);
  81     }
  82
  83
  84     /// getShortHelp - Return the short help string for this command.
  85     ///
  86     const std::string &getShortHelp() { return ShortHelp; }
  87
  88     /// getLongHelp - Return the long help string for this command, if it
  89     /// exists.
  90     const std::string &getLongHelp() { return LongHelp; }
  91
  92     virtual void runCommand(CLIDebugger &D, std::string &Arguments) = 0;
  93   };
  94
  95   /// BuiltinCLICommand - This class represents commands that are built directly
  96   /// into the debugger.
  97   class BuiltinCLICommand : public CLICommand {
  98     // Impl - Pointer to the method that implements the command
  99     void (CLIDebugger::*Impl)(std::string&);
 100   public:
 101     BuiltinCLICommand(const std::string &ShortHelp, const std::string &LongHelp,
 102                       void (CLIDebugger::*impl)(std::string&))
 103       : CLICommand(ShortHelp, LongHelp), Impl(impl) {}
 104
 105     void runCommand(CLIDebugger &D, std::string &Arguments) {
 106       (D.*Impl)(Arguments);
 107     }
 108   };
 109 }
 110
 111 #endif