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//===-- CLIDebugger.cpp - Command Line Interface to the Debugger ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the main implementation of the Command Line Interface to
// the debugger.
//
//===----------------------------------------------------------------------===//
#include "CLIDebugger.h"
#include "CLICommand.h"
#include "llvm/Debugger/SourceFile.h"
#include "llvm/ADT/StringExtras.h"
#include <iostream>
using namespace llvm;
/// CLIDebugger constructor - This initializes the debugger to its default
/// state, and initializes the command table.
///
CLIDebugger::CLIDebugger()
: TheProgramInfo(0), TheRuntimeInfo(0), Prompt("(llvm-db) "), ListSize(10) {
// Initialize instance variables
CurrentFile = 0;
LineListedStart = 1;
LineListedEnd = 1;
LastCurrentFrame = 0;
CurrentLanguage = 0;
CLICommand *C;
//===--------------------------------------------------------------------===//
// Program startup and shutdown options
//
addCommand("file", new BuiltinCLICommand(
"Use specified file as the program to be debugged",
"The debugger looks in the current directory and the program $PATH for the"
" specified LLVM program. It then unloads the currently loaded program and"
" loads the specified program.\n",
&CLIDebugger::fileCommand));
addCommand("create", new BuiltinCLICommand(
"Start the program, halting its execution in main",
"This command creates an instance of the current program, but stops"
"\nexecution immediately.\n",
&CLIDebugger::createCommand));
addCommand("kill", new BuiltinCLICommand(
"Kills the execution of the current program being debugged", "",
&CLIDebugger::killCommand));
addCommand("quit", new BuiltinCLICommand(
"Exit the debugger", "",
&CLIDebugger::quitCommand));
//===--------------------------------------------------------------------===//
// Program execution commands
//
addCommand("run", C = new BuiltinCLICommand(
"Start the program running from the beginning", "",
&CLIDebugger::runCommand));
addCommand("r", C);
addCommand("cont", C = new BuiltinCLICommand(
"Continue program being debugged until the next stop point", "",
&CLIDebugger::contCommand));
addCommand("c", C); addCommand("fg", C);
addCommand("step", C = new BuiltinCLICommand(
"Step program until it reaches a new source line", "",
&CLIDebugger::stepCommand));
addCommand("s", C);
addCommand("next", C = new BuiltinCLICommand(
"Step program until it reaches a new source line, stepping over calls", "",
&CLIDebugger::nextCommand));
addCommand("n", C);
addCommand("finish", new BuiltinCLICommand(
"Execute until the selected stack frame returns",
"Upon return, the value returned is printed and put in the value history.\n",
&CLIDebugger::finishCommand));
//===--------------------------------------------------------------------===//
// Stack frame commands
//
addCommand("backtrace", C = new BuiltinCLICommand(
"Print backtrace of all stack frames, or innermost COUNT frames",
"FIXME: describe. Takes 'n', '-n' or 'full'\n",
&CLIDebugger::backtraceCommand));
addCommand("bt", C);
addCommand("up", new BuiltinCLICommand(
"Select and print stack frame that called this one",
"An argument says how many frames up to go.\n",
&CLIDebugger::upCommand));
addCommand("down", new BuiltinCLICommand(
"Select and print stack frame called by this one",
"An argument says how many frames down go.\n",
&CLIDebugger::downCommand));
addCommand("frame", C = new BuiltinCLICommand(
"Select and print a stack frame",
"With no argument, print the selected stack frame. (See also 'info frame').\n"
"An argument specifies the frame to select.\n",
&CLIDebugger::frameCommand));
addCommand("f", C);
//===--------------------------------------------------------------------===//
// Breakpoint related commands
//
addCommand("break", C = new BuiltinCLICommand(
"Set breakpoint at specified line or function",
"FIXME: describe.\n",
&CLIDebugger::breakCommand));
addCommand("b", C);
//===--------------------------------------------------------------------===//
// Miscellaneous commands
//
addCommand("info", new BuiltinCLICommand(
"Generic command for showing things about the program being debugged",
"info functions: display information about functions in the program.\ninfo"
" source : display information about the current source file.\ninfo source"
"s : Display source file names for the program\ninfo target : print status"
" of inferior process\n",
&CLIDebugger::infoCommand));
addCommand("list", C = new BuiltinCLICommand(
"List specified function or line",
"FIXME: document\n",
&CLIDebugger::listCommand));
addCommand("l", C);
addCommand("set", new BuiltinCLICommand(
"Change program or debugger variable",
"FIXME: document\n",
&CLIDebugger::setCommand));
addCommand("show", new BuiltinCLICommand(
"Generic command for showing things about the debugger",
"FIXME: document\n",
&CLIDebugger::showCommand));
addCommand("help", C = new BuiltinCLICommand(
"Prints information about available commands", "",
&CLIDebugger::helpCommand));
addCommand("h", C);
}
/// addCommand - Add a command to the CommandTable, potentially displacing a
/// preexisting command.
void CLIDebugger::addCommand(const std::string &Option, CLICommand *Cmd) {
assert(Cmd && "Cannot set a null command!");
CLICommand *&CS = CommandTable[Option];
if (CS == Cmd) return; // noop
// If we already have a command, decrement the command's reference count.
if (CS) {
CS->removeOptionName(Option);
CS->dropRef();
}
CS = Cmd;
// Remember that we are using this command.
Cmd->addRef();
Cmd->addOptionName(Option);
}
static bool isValidPrefix(const std::string &Prefix, const std::string &Option){
return Prefix.size() <= Option.size() &&
Prefix == std::string(Option.begin(), Option.begin()+Prefix.size());
}
/// getCommand - This looks up the specified command using a fuzzy match.
/// If the string exactly matches a command or is an unambiguous prefix of a
/// command, it returns the command. Otherwise it throws an exception
/// indicating the possible ambiguous choices.
CLICommand *CLIDebugger::getCommand(const std::string &Command) {
// Look up the command in the table.
std::map<std::string, CLICommand*>::iterator CI =
CommandTable.lower_bound(Command);
if (Command == "") {
throw "Null command should not get here!";
} else if (CI == CommandTable.end() ||
!isValidPrefix(Command, CI->first)) {
// If this command has no relation to anything in the command table,
// print the error message.
throw "Unknown command: '" + Command +
"'. Use 'help' for list of commands.";
} else if (CI->first == Command) {
// We have an exact match on the command
return CI->second;
} else {
// Otherwise, we have a prefix match. Check to see if this is
// unambiguous, and if so, run it.
std::map<std::string, CLICommand*>::iterator CI2 = CI;
// If the next command is a valid completion of this one, we are
// ambiguous.
if (++CI2 != CommandTable.end() && isValidPrefix(Command, CI2->first)) {
std::string ErrorMsg =
"Ambiguous command '" + Command + "'. Options: " + CI->first;
for (++CI; CI != CommandTable.end() &&
isValidPrefix(Command, CI->first); ++CI)
ErrorMsg += ", " + CI->first;
throw ErrorMsg;
} else {
// It's an unambiguous prefix of a command, use it.
return CI->second;
}
}
}
/// run - Start the debugger, returning when the user exits the debugger. This
/// starts the main event loop of the CLI debugger.
///
int CLIDebugger::run() {
std::string Command;
std::cout << Prompt;
// Keep track of the last command issued, so that we can reissue it if the
// user hits enter as the command.
CLICommand *LastCommand = 0;
std::string LastArgs;
// Continue reading commands until the end of file.
while (getline(std::cin, Command)) {
std::string Arguments = Command;
// Split off the command from the arguments to the command.
Command = getToken(Arguments, " \t\n\v\f\r\\/;.*&");
try {
CLICommand *CurCommand;
if (Command == "") {
CurCommand = LastCommand;
Arguments = LastArgs;
} else {
CurCommand = getCommand(Command);
}
// Save the command we are running in case the user wants us to repeat it
// next time.
LastCommand = CurCommand;
LastArgs = Arguments;
// Finally, execute the command.
if (CurCommand)
CurCommand->runCommand(*this, Arguments);
} catch (int RetVal) {
// The quit command exits the command loop by throwing an integer return
// code.
return RetVal;
} catch (const std::string &Error) {
std::cout << "Error: " << Error << "\n";
} catch (const char *Error) {
std::cout << "Error: " << Error << "\n";
} catch (const NonErrorException &E) {
std::cout << E.getMessage() << "\n";
} catch (...) {
std::cout << "ERROR: Debugger caught unexpected exception!\n";
// Attempt to continue.
}
// Write the prompt to get the next bit of user input
std::cout << Prompt;
}
return 0;
}
/// askYesNo - Ask the user a question, and demand a yes/no response. If
/// the user says yes, return true.
///
bool CLIDebugger::askYesNo(const std::string &Message) const {
std::string Answer;
std::cout << Message << " (y or n) " << std::flush;
while (getline(std::cin, Answer)) {
std::string Val = getToken(Answer);
if (getToken(Answer).empty()) {
if (Val == "yes" || Val == "y" || Val == "YES" || Val == "Y" ||
Val == "Yes")
return true;
if (Val == "no" || Val == "n" || Val == "NO" || Val == "N" ||
Val == "No")
return false;
}
std::cout << "Please answer y or n.\n" << Message << " (y or n) "
<< std::flush;
}
// Ran out of input?
return false;
}