1 //===-- CommandObject.h -----------------------------------------*- C++ -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 #ifndef LLDB_INTERPRETER_COMMANDOBJECT_H
10 #define LLDB_INTERPRETER_COMMANDOBJECT_H
16 #include "lldb/Utility/Flags.h"
18 #include "lldb/Interpreter/CommandCompletions.h"
19 #include "lldb/Interpreter/Options.h"
20 #include "lldb/Target/ExecutionContext.h"
21 #include "lldb/Utility/Args.h"
22 #include "lldb/Utility/CompletionRequest.h"
23 #include "lldb/Utility/StringList.h"
24 #include "lldb/lldb-private.h"
26 namespace lldb_private {
28 // This function really deals with CommandObjectLists, but we didn't make a
29 // CommandObjectList class, so I'm sticking it here. But we really should have
30 // such a class. Anyway, it looks up the commands in the map that match the
31 // partial string cmd_str, inserts the matches into matches, and returns the
34 template <typename ValueType>
35 int AddNamesMatchingPartialString(
36 const std::map<std::string, ValueType> &in_map, llvm::StringRef cmd_str,
37 StringList &matches, StringList *descriptions = nullptr) {
40 const bool add_all = cmd_str.empty();
42 for (auto iter = in_map.begin(), end = in_map.end(); iter != end; iter++) {
43 if (add_all || (iter->first.find(std::string(cmd_str), 0) == 0)) {
45 matches.AppendString(iter->first.c_str());
47 descriptions->AppendString(iter->second->GetHelp());
54 template <typename ValueType>
55 size_t FindLongestCommandWord(std::map<std::string, ValueType> &dict) {
56 auto end = dict.end();
59 for (auto pos = dict.begin(); pos != end; ++pos) {
60 size_t len = pos->first.size();
69 typedef llvm::StringRef(ArgumentHelpCallbackFunction)();
71 struct ArgumentHelpCallback {
72 ArgumentHelpCallbackFunction *help_callback;
75 llvm::StringRef operator()() const { return (*help_callback)(); }
77 explicit operator bool() const { return (help_callback != nullptr); }
80 struct ArgumentTableEntry // Entries in the main argument information table
82 lldb::CommandArgumentType arg_type;
84 CommandCompletions::CommonCompletionTypes completion_type;
85 ArgumentHelpCallback help_function;
86 const char *help_text;
89 struct CommandArgumentData // Used to build individual command argument lists
91 lldb::CommandArgumentType arg_type;
92 ArgumentRepetitionType arg_repetition;
93 /// This arg might be associated only with some particular option set(s). By
94 /// default the arg associates to all option sets.
95 uint32_t arg_opt_set_association;
97 CommandArgumentData(lldb::CommandArgumentType type = lldb::eArgTypeNone,
98 ArgumentRepetitionType repetition = eArgRepeatPlain,
99 uint32_t opt_set = LLDB_OPT_SET_ALL)
100 : arg_type(type), arg_repetition(repetition),
101 arg_opt_set_association(opt_set) {}
104 typedef std::vector<CommandArgumentData>
105 CommandArgumentEntry; // Used to build individual command argument lists
107 static ArgumentTableEntry g_arguments_data
108 [lldb::eArgTypeLastArg]; // Main argument information table
110 typedef std::map<std::string, lldb::CommandObjectSP> CommandMap;
112 CommandObject(CommandInterpreter &interpreter, llvm::StringRef name,
113 llvm::StringRef help = "", llvm::StringRef syntax = "",
116 virtual ~CommandObject() = default;
119 GetArgumentTypeAsCString(const lldb::CommandArgumentType arg_type);
122 GetArgumentDescriptionAsCString(const lldb::CommandArgumentType arg_type);
124 CommandInterpreter &GetCommandInterpreter() { return m_interpreter; }
125 Debugger &GetDebugger();
127 virtual llvm::StringRef GetHelp();
129 virtual llvm::StringRef GetHelpLong();
131 virtual llvm::StringRef GetSyntax();
133 llvm::StringRef GetCommandName() const;
135 virtual void SetHelp(llvm::StringRef str);
137 virtual void SetHelpLong(llvm::StringRef str);
139 void SetSyntax(llvm::StringRef str);
141 // override this to return true if you want to enable the user to delete the
142 // Command object from the Command dictionary (aliases have their own
143 // deletion scheme, so they do not need to care about this)
144 virtual bool IsRemovable() const { return false; }
146 virtual bool IsMultiwordObject() { return false; }
148 virtual CommandObjectMultiword *GetAsMultiwordCommand() { return nullptr; }
150 virtual bool IsAlias() { return false; }
152 // override this to return true if your command is somehow a "dash-dash" form
153 // of some other command (e.g. po is expr -O --); this is a powerful hint to
154 // the help system that one cannot pass options to this command
155 virtual bool IsDashDashCommand() { return false; }
157 virtual lldb::CommandObjectSP GetSubcommandSP(llvm::StringRef sub_cmd,
158 StringList *matches = nullptr) {
159 return lldb::CommandObjectSP();
162 virtual CommandObject *GetSubcommandObject(llvm::StringRef sub_cmd,
163 StringList *matches = nullptr) {
167 virtual void AproposAllSubCommands(llvm::StringRef prefix,
168 llvm::StringRef search_word,
169 StringList &commands_found,
170 StringList &commands_help) {}
172 void FormatLongHelpText(Stream &output_strm, llvm::StringRef long_help);
174 void GenerateHelpText(CommandReturnObject &result);
176 virtual void GenerateHelpText(Stream &result);
178 // this is needed in order to allow the SBCommand class to transparently try
179 // and load subcommands - it will fail on anything but a multiword command,
180 // but it avoids us doing type checkings and casts
181 virtual bool LoadSubCommand(llvm::StringRef cmd_name,
182 const lldb::CommandObjectSP &command_obj) {
186 virtual bool WantsRawCommandString() = 0;
188 // By default, WantsCompletion = !WantsRawCommandString. Subclasses who want
189 // raw command string but desire, for example, argument completion should
190 // override this method to return true.
191 virtual bool WantsCompletion() { return !WantsRawCommandString(); }
193 virtual Options *GetOptions();
195 static const ArgumentTableEntry *GetArgumentTable();
197 static lldb::CommandArgumentType LookupArgumentName(llvm::StringRef arg_name);
199 static const ArgumentTableEntry *
200 FindArgumentDataByType(lldb::CommandArgumentType arg_type);
202 int GetNumArgumentEntries();
204 CommandArgumentEntry *GetArgumentEntryAtIndex(int idx);
206 static void GetArgumentHelp(Stream &str, lldb::CommandArgumentType arg_type,
207 CommandInterpreter &interpreter);
209 static const char *GetArgumentName(lldb::CommandArgumentType arg_type);
211 // Generates a nicely formatted command args string for help command output.
212 // By default, all possible args are taken into account, for example, '<expr
213 // | variable-name>'. This can be refined by passing a second arg specifying
214 // which option set(s) we are interested, which could then, for example,
215 // produce either '<expr>' or '<variable-name>'.
216 void GetFormattedCommandArguments(Stream &str,
217 uint32_t opt_set_mask = LLDB_OPT_SET_ALL);
219 bool IsPairType(ArgumentRepetitionType arg_repeat_type);
221 bool ParseOptions(Args &args, CommandReturnObject &result);
223 void SetCommandName(llvm::StringRef name);
225 /// This default version handles calling option argument completions and then
226 /// calls HandleArgumentCompletion if the cursor is on an argument, not an
227 /// option. Don't override this method, override HandleArgumentCompletion
228 /// instead unless you have special reasons.
230 /// \param[in,out] request
231 /// The completion request that needs to be answered.
232 virtual void HandleCompletion(CompletionRequest &request);
234 /// The input array contains a parsed version of the line.
236 /// We've constructed the map of options and their arguments as well if that
237 /// is helpful for the completion.
239 /// \param[in,out] request
240 /// The completion request that needs to be answered.
242 HandleArgumentCompletion(CompletionRequest &request,
243 OptionElementVector &opt_element_vector) {}
245 bool HelpTextContainsWord(llvm::StringRef search_word,
246 bool search_short_help = true,
247 bool search_long_help = true,
248 bool search_syntax = true,
249 bool search_options = true);
251 /// The flags accessor.
254 /// A reference to the Flags member variable.
255 Flags &GetFlags() { return m_flags; }
257 /// The flags const accessor.
260 /// A const reference to the Flags member variable.
261 const Flags &GetFlags() const { return m_flags; }
263 /// Get the command that appropriate for a "repeat" of the current command.
265 /// \param[in] current_command_args
266 /// The command arguments.
269 /// nullptr if there is no special repeat command - it will use the
270 /// current command line.
271 /// Otherwise a pointer to the command to be repeated.
272 /// If the returned string is the empty string, the command won't be
274 virtual const char *GetRepeatCommand(Args ¤t_command_args,
279 bool HasOverrideCallback() const {
280 return m_command_override_callback ||
281 m_deprecated_command_override_callback;
284 void SetOverrideCallback(lldb::CommandOverrideCallback callback,
286 m_deprecated_command_override_callback = callback;
287 m_command_override_baton = baton;
290 void SetOverrideCallback(lldb::CommandOverrideCallbackWithResult callback,
292 m_command_override_callback = callback;
293 m_command_override_baton = baton;
296 bool InvokeOverrideCallback(const char **argv, CommandReturnObject &result) {
297 if (m_command_override_callback)
298 return m_command_override_callback(m_command_override_baton, argv,
300 else if (m_deprecated_command_override_callback)
301 return m_deprecated_command_override_callback(m_command_override_baton,
307 virtual bool Execute(const char *args_string,
308 CommandReturnObject &result) = 0;
311 bool ParseOptionsAndNotify(Args &args, CommandReturnObject &result,
312 OptionGroupOptions &group_options,
313 ExecutionContext &exe_ctx);
315 virtual const char *GetInvalidTargetDescription() {
316 return "invalid target, create a target using the 'target create' command";
319 virtual const char *GetInvalidProcessDescription() {
320 return "invalid process";
323 virtual const char *GetInvalidThreadDescription() { return "invalid thread"; }
325 virtual const char *GetInvalidFrameDescription() { return "invalid frame"; }
327 virtual const char *GetInvalidRegContextDescription() {
328 return "invalid frame, no registers";
331 // This is for use in the command interpreter, when you either want the
332 // selected target, or if no target is present you want to prime the dummy
333 // target with entities that will be copied over to new targets.
334 Target &GetSelectedOrDummyTarget(bool prefer_dummy = false);
335 Target &GetSelectedTarget();
336 Target &GetDummyTarget();
338 // If a command needs to use the "current" thread, use this call. Command
339 // objects will have an ExecutionContext to use, and that may or may not have
340 // a thread in it. If it does, you should use that by default, if not, then
341 // use the ExecutionContext's target's selected thread, etc... This call
342 // insulates you from the details of this calculation.
343 Thread *GetDefaultThread();
345 /// Check the command to make sure anything required by this
346 /// command is available.
348 /// \param[out] result
349 /// A command result object, if it is not okay to run the command
350 /// this will be filled in with a suitable error.
353 /// \b true if it is okay to run this command, \b false otherwise.
354 bool CheckRequirements(CommandReturnObject &result);
358 CommandInterpreter &m_interpreter;
359 ExecutionContext m_exe_ctx;
360 std::unique_lock<std::recursive_mutex> m_api_locker;
361 std::string m_cmd_name;
362 std::string m_cmd_help_short;
363 std::string m_cmd_help_long;
364 std::string m_cmd_syntax;
366 std::vector<CommandArgumentEntry> m_arguments;
367 lldb::CommandOverrideCallback m_deprecated_command_override_callback;
368 lldb::CommandOverrideCallbackWithResult m_command_override_callback;
369 void *m_command_override_baton;
371 // Helper function to populate IDs or ID ranges as the command argument data
372 // to the specified command argument entry.
373 static void AddIDsArgumentData(CommandArgumentEntry &arg,
374 lldb::CommandArgumentType ID,
375 lldb::CommandArgumentType IDRange);
378 class CommandObjectParsed : public CommandObject {
380 CommandObjectParsed(CommandInterpreter &interpreter, const char *name,
381 const char *help = nullptr, const char *syntax = nullptr,
383 : CommandObject(interpreter, name, help, syntax, flags) {}
385 ~CommandObjectParsed() override = default;
387 bool Execute(const char *args_string, CommandReturnObject &result) override;
390 virtual bool DoExecute(Args &command, CommandReturnObject &result) = 0;
392 bool WantsRawCommandString() override { return false; }
395 class CommandObjectRaw : public CommandObject {
397 CommandObjectRaw(CommandInterpreter &interpreter, llvm::StringRef name,
398 llvm::StringRef help = "", llvm::StringRef syntax = "",
400 : CommandObject(interpreter, name, help, syntax, flags) {}
402 ~CommandObjectRaw() override = default;
404 bool Execute(const char *args_string, CommandReturnObject &result) override;
407 virtual bool DoExecute(llvm::StringRef command,
408 CommandReturnObject &result) = 0;
410 bool WantsRawCommandString() override { return true; }
413 } // namespace lldb_private
415 #endif // LLDB_INTERPRETER_COMMANDOBJECT_H