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 liblldb_CommandObject_h_
10 #define liblldb_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(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 uint32_t arg_opt_set_association; // This arg might be associated only with
94 // some particular option set(s).
96 : arg_type(lldb::eArgTypeNone), arg_repetition(eArgRepeatPlain),
97 arg_opt_set_association(LLDB_OPT_SET_ALL) // By default, the arg
98 // associates to all option
103 typedef std::vector<CommandArgumentData>
104 CommandArgumentEntry; // Used to build individual command argument lists
106 static ArgumentTableEntry g_arguments_data
107 [lldb::eArgTypeLastArg]; // Main argument information table
109 typedef std::map<std::string, lldb::CommandObjectSP> CommandMap;
111 CommandObject(CommandInterpreter &interpreter, llvm::StringRef name,
112 llvm::StringRef help = "", llvm::StringRef syntax = "",
115 virtual ~CommandObject();
118 GetArgumentTypeAsCString(const lldb::CommandArgumentType arg_type);
121 GetArgumentDescriptionAsCString(const lldb::CommandArgumentType arg_type);
123 CommandInterpreter &GetCommandInterpreter() { return m_interpreter; }
124 Debugger &GetDebugger();
126 virtual llvm::StringRef GetHelp();
128 virtual llvm::StringRef GetHelpLong();
130 virtual llvm::StringRef GetSyntax();
132 llvm::StringRef GetCommandName() const;
134 virtual void SetHelp(llvm::StringRef str);
136 virtual void SetHelpLong(llvm::StringRef str);
138 void SetSyntax(llvm::StringRef str);
140 // override this to return true if you want to enable the user to delete the
141 // Command object from the Command dictionary (aliases have their own
142 // deletion scheme, so they do not need to care about this)
143 virtual bool IsRemovable() const { return false; }
145 virtual bool IsMultiwordObject() { return false; }
147 virtual CommandObjectMultiword *GetAsMultiwordCommand() { return nullptr; }
149 virtual bool IsAlias() { return false; }
151 // override this to return true if your command is somehow a "dash-dash" form
152 // of some other command (e.g. po is expr -O --); this is a powerful hint to
153 // the help system that one cannot pass options to this command
154 virtual bool IsDashDashCommand() { return false; }
156 virtual lldb::CommandObjectSP GetSubcommandSP(llvm::StringRef sub_cmd,
157 StringList *matches = nullptr) {
158 return lldb::CommandObjectSP();
161 virtual CommandObject *GetSubcommandObject(llvm::StringRef sub_cmd,
162 StringList *matches = nullptr) {
166 virtual void AproposAllSubCommands(llvm::StringRef prefix,
167 llvm::StringRef search_word,
168 StringList &commands_found,
169 StringList &commands_help) {}
171 void FormatLongHelpText(Stream &output_strm, llvm::StringRef long_help);
173 void GenerateHelpText(CommandReturnObject &result);
175 virtual void GenerateHelpText(Stream &result);
177 // this is needed in order to allow the SBCommand class to transparently try
178 // and load subcommands - it will fail on anything but a multiword command,
179 // but it avoids us doing type checkings and casts
180 virtual bool LoadSubCommand(llvm::StringRef cmd_name,
181 const lldb::CommandObjectSP &command_obj) {
185 virtual bool WantsRawCommandString() = 0;
187 // By default, WantsCompletion = !WantsRawCommandString. Subclasses who want
188 // raw command string but desire, for example, argument completion should
189 // override this method to return true.
190 virtual bool WantsCompletion() { return !WantsRawCommandString(); }
192 virtual Options *GetOptions();
194 static const ArgumentTableEntry *GetArgumentTable();
196 static lldb::CommandArgumentType LookupArgumentName(llvm::StringRef arg_name);
198 static const ArgumentTableEntry *
199 FindArgumentDataByType(lldb::CommandArgumentType arg_type);
201 int GetNumArgumentEntries();
203 CommandArgumentEntry *GetArgumentEntryAtIndex(int idx);
205 static void GetArgumentHelp(Stream &str, lldb::CommandArgumentType arg_type,
206 CommandInterpreter &interpreter);
208 static const char *GetArgumentName(lldb::CommandArgumentType arg_type);
210 // Generates a nicely formatted command args string for help command output.
211 // By default, all possible args are taken into account, for example, '<expr
212 // | variable-name>'. This can be refined by passing a second arg specifying
213 // which option set(s) we are interested, which could then, for example,
214 // produce either '<expr>' or '<variable-name>'.
215 void GetFormattedCommandArguments(Stream &str,
216 uint32_t opt_set_mask = LLDB_OPT_SET_ALL);
218 bool IsPairType(ArgumentRepetitionType arg_repeat_type);
220 bool ParseOptions(Args &args, CommandReturnObject &result);
222 void SetCommandName(llvm::StringRef name);
224 /// This default version handles calling option argument completions and then
225 /// calls HandleArgumentCompletion if the cursor is on an argument, not an
226 /// option. Don't override this method, override HandleArgumentCompletion
227 /// instead unless you have special reasons.
229 /// \param[in/out] request
230 /// The completion request that needs to be answered.
232 /// FIXME: This is the wrong return value, since we also need to make a
233 /// distinction between
234 /// total number of matches, and the window the user wants returned.
237 /// \btrue if we were in an option, \bfalse otherwise.
238 virtual int HandleCompletion(CompletionRequest &request);
240 /// The input array contains a parsed version of the line. The insertion
241 /// point is given by cursor_index (the index in input of the word containing
242 /// the cursor) and cursor_char_position (the position of the cursor in that
244 /// We've constructed the map of options and their arguments as well if that
245 /// is helpful for the completion.
247 /// \param[in/out] request
248 /// The completion request that needs to be answered.
250 /// FIXME: This is the wrong return value, since we also need to make a
251 /// distinction between
252 /// total number of matches, and the window the user wants returned.
255 /// The number of completions.
257 HandleArgumentCompletion(CompletionRequest &request,
258 OptionElementVector &opt_element_vector) {
262 bool HelpTextContainsWord(llvm::StringRef search_word,
263 bool search_short_help = true,
264 bool search_long_help = true,
265 bool search_syntax = true,
266 bool search_options = true);
268 /// The flags accessor.
271 /// A reference to the Flags member variable.
272 Flags &GetFlags() { return m_flags; }
274 /// The flags const accessor.
277 /// A const reference to the Flags member variable.
278 const Flags &GetFlags() const { return m_flags; }
280 /// Get the command that appropriate for a "repeat" of the current command.
282 /// \param[in] current_command_line
283 /// The complete current command line.
286 /// nullptr if there is no special repeat command - it will use the
287 /// current command line.
288 /// Otherwise a pointer to the command to be repeated.
289 /// If the returned string is the empty string, the command won't be
291 virtual const char *GetRepeatCommand(Args ¤t_command_args,
296 bool HasOverrideCallback() const {
297 return m_command_override_callback ||
298 m_deprecated_command_override_callback;
301 void SetOverrideCallback(lldb::CommandOverrideCallback callback,
303 m_deprecated_command_override_callback = callback;
304 m_command_override_baton = baton;
307 void SetOverrideCallback(lldb::CommandOverrideCallbackWithResult callback,
309 m_command_override_callback = callback;
310 m_command_override_baton = baton;
313 bool InvokeOverrideCallback(const char **argv, CommandReturnObject &result) {
314 if (m_command_override_callback)
315 return m_command_override_callback(m_command_override_baton, argv,
317 else if (m_deprecated_command_override_callback)
318 return m_deprecated_command_override_callback(m_command_override_baton,
324 virtual bool Execute(const char *args_string,
325 CommandReturnObject &result) = 0;
328 bool ParseOptionsAndNotify(Args &args, CommandReturnObject &result,
329 OptionGroupOptions &group_options,
330 ExecutionContext &exe_ctx);
332 virtual const char *GetInvalidTargetDescription() {
333 return "invalid target, create a target using the 'target create' command";
336 virtual const char *GetInvalidProcessDescription() {
337 return "invalid process";
340 virtual const char *GetInvalidThreadDescription() { return "invalid thread"; }
342 virtual const char *GetInvalidFrameDescription() { return "invalid frame"; }
344 virtual const char *GetInvalidRegContextDescription() {
345 return "invalid frame, no registers";
348 // This is for use in the command interpreter, when you either want the
349 // selected target, or if no target is present you want to prime the dummy
350 // target with entities that will be copied over to new targets.
351 Target *GetSelectedOrDummyTarget(bool prefer_dummy = false);
352 Target *GetDummyTarget();
354 // If a command needs to use the "current" thread, use this call. Command
355 // objects will have an ExecutionContext to use, and that may or may not have
356 // a thread in it. If it does, you should use that by default, if not, then
357 // use the ExecutionContext's target's selected thread, etc... This call
358 // insulates you from the details of this calculation.
359 Thread *GetDefaultThread();
361 /// Check the command to make sure anything required by this
362 /// command is available.
364 /// \param[out] result
365 /// A command result object, if it is not okay to run the command
366 /// this will be filled in with a suitable error.
369 /// \b true if it is okay to run this command, \b false otherwise.
370 bool CheckRequirements(CommandReturnObject &result);
374 CommandInterpreter &m_interpreter;
375 ExecutionContext m_exe_ctx;
376 std::unique_lock<std::recursive_mutex> m_api_locker;
377 std::string m_cmd_name;
378 std::string m_cmd_help_short;
379 std::string m_cmd_help_long;
380 std::string m_cmd_syntax;
382 std::vector<CommandArgumentEntry> m_arguments;
383 lldb::CommandOverrideCallback m_deprecated_command_override_callback;
384 lldb::CommandOverrideCallbackWithResult m_command_override_callback;
385 void *m_command_override_baton;
387 // Helper function to populate IDs or ID ranges as the command argument data
388 // to the specified command argument entry.
389 static void AddIDsArgumentData(CommandArgumentEntry &arg,
390 lldb::CommandArgumentType ID,
391 lldb::CommandArgumentType IDRange);
394 class CommandObjectParsed : public CommandObject {
396 CommandObjectParsed(CommandInterpreter &interpreter, const char *name,
397 const char *help = nullptr, const char *syntax = nullptr,
399 : CommandObject(interpreter, name, help, syntax, flags) {}
401 ~CommandObjectParsed() override = default;
403 bool Execute(const char *args_string, CommandReturnObject &result) override;
406 virtual bool DoExecute(Args &command, CommandReturnObject &result) = 0;
408 bool WantsRawCommandString() override { return false; }
411 class CommandObjectRaw : public CommandObject {
413 CommandObjectRaw(CommandInterpreter &interpreter, llvm::StringRef name,
414 llvm::StringRef help = "", llvm::StringRef syntax = "",
416 : CommandObject(interpreter, name, help, syntax, flags) {}
418 ~CommandObjectRaw() override = default;
420 bool Execute(const char *args_string, CommandReturnObject &result) override;
423 virtual bool DoExecute(llvm::StringRef command,
424 CommandReturnObject &result) = 0;
426 bool WantsRawCommandString() override { return true; }
429 } // namespace lldb_private
431 #endif // liblldb_CommandObject_h_