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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21428 91177308-0d34-0410-b5e6-96231b3b80d8
309 lines
10 KiB
C++
309 lines
10 KiB
C++
//===-- CLIDebugger.cpp - Command Line Interface to the Debugger ----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the main implementation of the Command Line Interface to
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// the debugger.
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//
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//===----------------------------------------------------------------------===//
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#include "CLIDebugger.h"
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#include "CLICommand.h"
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#include "llvm/Debugger/SourceFile.h"
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#include "llvm/ADT/StringExtras.h"
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#include <iostream>
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using namespace llvm;
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/// CLIDebugger constructor - This initializes the debugger to its default
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/// state, and initializes the command table.
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///
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CLIDebugger::CLIDebugger()
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: TheProgramInfo(0), TheRuntimeInfo(0), Prompt("(llvm-db) "), ListSize(10) {
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// Initialize instance variables
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CurrentFile = 0;
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LineListedStart = 1;
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LineListedEnd = 1;
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LastCurrentFrame = 0;
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CurrentLanguage = 0;
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CLICommand *C;
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//===--------------------------------------------------------------------===//
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// Program startup and shutdown options
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//
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addCommand("file", new BuiltinCLICommand(
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"Use specified file as the program to be debugged",
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"The debugger looks in the current directory and the program $PATH for the"
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" specified LLVM program. It then unloads the currently loaded program and"
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" loads the specified program.\n",
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&CLIDebugger::fileCommand));
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addCommand("create", new BuiltinCLICommand(
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"Start the program, halting its execution in main",
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"This command creates an instance of the current program, but stops"
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"\nexecution immediately.\n",
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&CLIDebugger::createCommand));
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addCommand("kill", new BuiltinCLICommand(
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"Kills the execution of the current program being debugged", "",
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&CLIDebugger::killCommand));
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addCommand("quit", new BuiltinCLICommand(
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"Exit the debugger", "",
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&CLIDebugger::quitCommand));
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//===--------------------------------------------------------------------===//
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// Program execution commands
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//
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addCommand("run", C = new BuiltinCLICommand(
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"Start the program running from the beginning", "",
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&CLIDebugger::runCommand));
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addCommand("r", C);
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addCommand("cont", C = new BuiltinCLICommand(
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"Continue program being debugged until the next stop point", "",
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&CLIDebugger::contCommand));
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addCommand("c", C); addCommand("fg", C);
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addCommand("step", C = new BuiltinCLICommand(
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"Step program until it reaches a new source line", "",
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&CLIDebugger::stepCommand));
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addCommand("s", C);
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addCommand("next", C = new BuiltinCLICommand(
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"Step program until it reaches a new source line, stepping over calls", "",
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&CLIDebugger::nextCommand));
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addCommand("n", C);
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addCommand("finish", new BuiltinCLICommand(
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"Execute until the selected stack frame returns",
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"Upon return, the value returned is printed and put in the value history.\n",
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&CLIDebugger::finishCommand));
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//===--------------------------------------------------------------------===//
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// Stack frame commands
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//
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addCommand("backtrace", C = new BuiltinCLICommand(
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"Print backtrace of all stack frames, or innermost COUNT frames",
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"FIXME: describe. Takes 'n', '-n' or 'full'\n",
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&CLIDebugger::backtraceCommand));
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addCommand("bt", C);
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addCommand("up", new BuiltinCLICommand(
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"Select and print stack frame that called this one",
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"An argument says how many frames up to go.\n",
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&CLIDebugger::upCommand));
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addCommand("down", new BuiltinCLICommand(
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"Select and print stack frame called by this one",
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"An argument says how many frames down go.\n",
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&CLIDebugger::downCommand));
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addCommand("frame", C = new BuiltinCLICommand(
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"Select and print a stack frame",
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"With no argument, print the selected stack frame. (See also 'info frame').\n"
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"An argument specifies the frame to select.\n",
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&CLIDebugger::frameCommand));
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addCommand("f", C);
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//===--------------------------------------------------------------------===//
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// Breakpoint related commands
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//
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addCommand("break", C = new BuiltinCLICommand(
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"Set breakpoint at specified line or function",
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"FIXME: describe.\n",
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&CLIDebugger::breakCommand));
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addCommand("b", C);
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//===--------------------------------------------------------------------===//
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// Miscellaneous commands
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//
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addCommand("info", new BuiltinCLICommand(
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"Generic command for showing things about the program being debugged",
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"info functions: display information about functions in the program.\ninfo"
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" source : display information about the current source file.\ninfo source"
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"s : Display source file names for the program\ninfo target : print status"
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" of inferior process\n",
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&CLIDebugger::infoCommand));
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addCommand("list", C = new BuiltinCLICommand(
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"List specified function or line",
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"FIXME: document\n",
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&CLIDebugger::listCommand));
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addCommand("l", C);
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addCommand("set", new BuiltinCLICommand(
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"Change program or debugger variable",
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"FIXME: document\n",
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&CLIDebugger::setCommand));
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addCommand("show", new BuiltinCLICommand(
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"Generic command for showing things about the debugger",
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"FIXME: document\n",
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&CLIDebugger::showCommand));
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addCommand("help", C = new BuiltinCLICommand(
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"Prints information about available commands", "",
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&CLIDebugger::helpCommand));
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addCommand("h", C);
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}
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/// addCommand - Add a command to the CommandTable, potentially displacing a
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/// preexisting command.
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void CLIDebugger::addCommand(const std::string &Option, CLICommand *Cmd) {
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assert(Cmd && "Cannot set a null command!");
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CLICommand *&CS = CommandTable[Option];
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if (CS == Cmd) return; // noop
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// If we already have a command, decrement the command's reference count.
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if (CS) {
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CS->removeOptionName(Option);
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CS->dropRef();
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}
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CS = Cmd;
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// Remember that we are using this command.
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Cmd->addRef();
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Cmd->addOptionName(Option);
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}
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static bool isValidPrefix(const std::string &Prefix, const std::string &Option){
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return Prefix.size() <= Option.size() &&
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Prefix == std::string(Option.begin(), Option.begin()+Prefix.size());
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}
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/// getCommand - This looks up the specified command using a fuzzy match.
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/// If the string exactly matches a command or is an unambiguous prefix of a
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/// command, it returns the command. Otherwise it throws an exception
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/// indicating the possible ambiguous choices.
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CLICommand *CLIDebugger::getCommand(const std::string &Command) {
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// Look up the command in the table.
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std::map<std::string, CLICommand*>::iterator CI =
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CommandTable.lower_bound(Command);
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if (Command == "") {
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throw "Null command should not get here!";
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} else if (CI == CommandTable.end() ||
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!isValidPrefix(Command, CI->first)) {
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// If this command has no relation to anything in the command table,
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// print the error message.
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throw "Unknown command: '" + Command +
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"'. Use 'help' for list of commands.";
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} else if (CI->first == Command) {
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// We have an exact match on the command
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return CI->second;
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} else {
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// Otherwise, we have a prefix match. Check to see if this is
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// unambiguous, and if so, run it.
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std::map<std::string, CLICommand*>::iterator CI2 = CI;
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// If the next command is a valid completion of this one, we are
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// ambiguous.
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if (++CI2 != CommandTable.end() && isValidPrefix(Command, CI2->first)) {
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std::string ErrorMsg =
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"Ambiguous command '" + Command + "'. Options: " + CI->first;
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for (++CI; CI != CommandTable.end() &&
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isValidPrefix(Command, CI->first); ++CI)
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ErrorMsg += ", " + CI->first;
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throw ErrorMsg;
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} else {
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// It's an unambiguous prefix of a command, use it.
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return CI->second;
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}
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}
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}
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/// run - Start the debugger, returning when the user exits the debugger. This
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/// starts the main event loop of the CLI debugger.
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///
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int CLIDebugger::run() {
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std::string Command;
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std::cout << Prompt;
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// Keep track of the last command issued, so that we can reissue it if the
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// user hits enter as the command.
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CLICommand *LastCommand = 0;
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std::string LastArgs;
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// Continue reading commands until the end of file.
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while (getline(std::cin, Command)) {
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std::string Arguments = Command;
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// Split off the command from the arguments to the command.
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Command = getToken(Arguments, " \t\n\v\f\r\\/;.*&");
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try {
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CLICommand *CurCommand;
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if (Command == "") {
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CurCommand = LastCommand;
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Arguments = LastArgs;
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} else {
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CurCommand = getCommand(Command);
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}
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// Save the command we are running in case the user wants us to repeat it
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// next time.
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LastCommand = CurCommand;
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LastArgs = Arguments;
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// Finally, execute the command.
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if (CurCommand)
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CurCommand->runCommand(*this, Arguments);
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} catch (int RetVal) {
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// The quit command exits the command loop by throwing an integer return
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// code.
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return RetVal;
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} catch (const std::string &Error) {
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std::cout << "Error: " << Error << "\n";
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} catch (const char *Error) {
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std::cout << "Error: " << Error << "\n";
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} catch (const NonErrorException &E) {
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std::cout << E.getMessage() << "\n";
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} catch (...) {
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std::cout << "ERROR: Debugger caught unexpected exception!\n";
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// Attempt to continue.
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}
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// Write the prompt to get the next bit of user input
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std::cout << Prompt;
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}
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return 0;
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}
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/// askYesNo - Ask the user a question, and demand a yes/no response. If
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/// the user says yes, return true.
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///
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bool CLIDebugger::askYesNo(const std::string &Message) const {
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std::string Answer;
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std::cout << Message << " (y or n) " << std::flush;
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while (getline(std::cin, Answer)) {
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std::string Val = getToken(Answer);
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if (getToken(Answer).empty()) {
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if (Val == "yes" || Val == "y" || Val == "YES" || Val == "Y" ||
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Val == "Yes")
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return true;
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if (Val == "no" || Val == "n" || Val == "NO" || Val == "N" ||
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Val == "No")
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return false;
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}
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std::cout << "Please answer y or n.\n" << Message << " (y or n) "
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<< std::flush;
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}
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// Ran out of input?
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return false;
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}
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