ScriptInterpreter.h

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//===-- ScriptInterpreter.h -------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#ifndef LLDB_INTERPRETER_SCRIPTINTERPRETER_H
#define LLDB_INTERPRETER_SCRIPTINTERPRETER_H
 
#include "lldb/Breakpoint/BreakpointOptions.h"
#include "lldb/Core/PluginInterface.h"
#include "lldb/Core/SearchFilter.h"
#include "lldb/Core/ThreadedCommunication.h"
#include "lldb/Host/PseudoTerminal.h"
#include "lldb/Host/StreamFile.h"
#include "lldb/Interpreter/Interfaces/OperatingSystemInterface.h"
#include "lldb/Interpreter/Interfaces/ScriptedFrameInterface.h"
#include "lldb/Interpreter/Interfaces/ScriptedFrameProviderInterface.h"
#include "lldb/Interpreter/Interfaces/ScriptedPlatformInterface.h"
#include "lldb/Interpreter/Interfaces/ScriptedProcessInterface.h"
#include "lldb/Interpreter/Interfaces/ScriptedThreadInterface.h"
#include "lldb/Interpreter/ScriptObject.h"
#include "lldb/Utility/Broadcaster.h"
#include "lldb/Utility/Status.h"
#include "lldb/Utility/StructuredData.h"
#include "lldb/Utility/UnimplementedError.h"
#include "lldb/lldb-private.h"
#include <optional>
 
namespace lldb_private {
 
class ScriptInterpreterLocker {
public:
  ScriptInterpreterLocker() = default;
 
  virtual ~ScriptInterpreterLocker() = default;
 
private:
  ScriptInterpreterLocker(const ScriptInterpreterLocker &) = delete;
  const ScriptInterpreterLocker &
  operator=(const ScriptInterpreterLocker &) = delete;
};
 
class ExecuteScriptOptions {
public:
  ExecuteScriptOptions() = default;
 
  bool GetEnableIO() const { return m_enable_io; }
 
  bool GetSetLLDBGlobals() const { return m_set_lldb_globals; }
 
  // If this is true then any exceptions raised by the script will be
  // cleared with PyErr_Clear().   If false then they will be left for
  // the caller to clean up
  bool GetMaskoutErrors() const { return m_maskout_errors; }
 
  ExecuteScriptOptions &SetEnableIO(bool enable) {
    m_enable_io = enable;
    return *this;
  }
 
  ExecuteScriptOptions &SetSetLLDBGlobals(bool set) {
    m_set_lldb_globals = set;
    return *this;
  }
 
  ExecuteScriptOptions &SetMaskoutErrors(bool maskout) {
    m_maskout_errors = maskout;
    return *this;
  }
 
private:
  bool m_enable_io = true;
  bool m_set_lldb_globals = true;
  bool m_maskout_errors = true;
};
 
class LoadScriptOptions {
public:
  LoadScriptOptions() = default;
 
  bool GetInitSession() const { return m_init_session; }
  bool GetSilent() const { return m_silent; }
 
  LoadScriptOptions &SetInitSession(bool b) {
    m_init_session = b;
    return *this;
  }
 
  LoadScriptOptions &SetSilent(bool b) {
    m_silent = b;
    return *this;
  }
 
private:
  bool m_init_session = false;
  bool m_silent = false;
};
 
class ScriptInterpreterIORedirect {
public:
  /// Create an IO redirect. If IO is enabled, this will redirects the output
  /// to the command return object if set or to the debugger otherwise. If IO
  /// is disabled, it will redirect all IO to /dev/null.
  static llvm::Expected<std::unique_ptr<ScriptInterpreterIORedirect>>
  Create(bool enable_io, Debugger &debugger, CommandReturnObject *result);
 
  ~ScriptInterpreterIORedirect();
 
  lldb::FileSP GetInputFile() const { return m_input_file_sp; }
  lldb::FileSP GetOutputFile() const {
    return m_output_file_sp->GetUnlockedFileSP();
  }
  lldb::FileSP GetErrorFile() const {
    return m_error_file_sp->GetUnlockedFileSP();
  }
 
  /// Flush our output and error file handles.
  void Flush();
 
private:
  ScriptInterpreterIORedirect(std::unique_ptr<File> input,
                              std::unique_ptr<File> output);
  ScriptInterpreterIORedirect(Debugger &debugger, CommandReturnObject *result);
 
  lldb::FileSP m_input_file_sp;
  lldb::LockableStreamFileSP m_output_file_sp;
  lldb::LockableStreamFileSP m_error_file_sp;
  LockableStreamFile::Mutex m_output_mutex;
  ThreadedCommunication m_communication;
  bool m_disconnect;
};
 
class ScriptInterpreter : public PluginInterface {
public:
  enum ScriptReturnType {
    eScriptReturnTypeCharPtr,
    eScriptReturnTypeBool,
    eScriptReturnTypeShortInt,
    eScriptReturnTypeShortIntUnsigned,
    eScriptReturnTypeInt,
    eScriptReturnTypeIntUnsigned,
    eScriptReturnTypeLongInt,
    eScriptReturnTypeLongIntUnsigned,
    eScriptReturnTypeLongLong,
    eScriptReturnTypeLongLongUnsigned,
    eScriptReturnTypeFloat,
    eScriptReturnTypeDouble,
    eScriptReturnTypeChar,
    eScriptReturnTypeCharStrOrNone,
    eScriptReturnTypeOpaqueObject
  };
 
  ScriptInterpreter(Debugger &debugger, lldb::ScriptLanguage script_lang);
 
  virtual StructuredData::DictionarySP GetInterpreterInfo();
 
  /// Describes one extension to emit into the generated template file.
  ///
  /// `full_name` is the dotted extension name as the user typed it (e.g.
  /// `"ScriptedProcess"` or a nested `"...ChildKind"`), used to name the
  /// generated class. `path` is the same name split on `.`; its last element
  /// selects the ScriptedExtension kind and everything before it is treated
  /// as a subclass discriminator. Both StringRefs must outlive the call to
  /// GenerateExtensionTemplate; the implementation stores them, not copies.
  struct ExtensionTemplateRequest {
    llvm::StringRef full_name;
    llvm::SmallVector<llvm::StringRef> path;
  };
 
  virtual llvm::Expected<FileSpec>
  GenerateExtensionTemplate(const std::string &name,
                            std::vector<ExtensionTemplateRequest> &extensions,
                            bool generate_non_abstract_methods,
                            std::string output_file);
 
  ~ScriptInterpreter() override = default;
 
  virtual bool Interrupt() { return false; }
 
  virtual bool ExecuteOneLine(
      llvm::StringRef command, CommandReturnObject *result,
      const ExecuteScriptOptions &options = ExecuteScriptOptions()) = 0;
 
  virtual void ExecuteInterpreterLoop() = 0;
 
  virtual bool ExecuteOneLineWithReturn(
      llvm::StringRef in_string, ScriptReturnType return_type, void *ret_value,
      const ExecuteScriptOptions &options = ExecuteScriptOptions()) {
    return true;
  }
 
  virtual Status ExecuteMultipleLines(
      const char *in_string,
      const ExecuteScriptOptions &options = ExecuteScriptOptions()) {
    return Status::FromErrorString("not implemented");
  }
 
  virtual Status
  ExportFunctionDefinitionToInterpreter(StringList &function_def) {
    return Status::FromErrorString("not implemented");
  }
 
  virtual Status GenerateBreakpointCommandCallbackData(StringList &input,
                                                       std::string &output,
                                                       bool has_extra_args,
                                                       bool is_callback) {
    return Status::FromErrorString("not implemented");
  }
 
  virtual bool GenerateWatchpointCommandCallbackData(StringList &input,
                                                     std::string &output,
                                                     bool is_callback) {
    return false;
  }
 
  virtual bool GenerateTypeScriptFunction(const char *oneliner,
                                          std::string &output,
                                          const void *name_token = nullptr) {
    return false;
  }
 
  virtual bool GenerateTypeScriptFunction(StringList &input,
                                          std::string &output,
                                          const void *name_token = nullptr) {
    return false;
  }
 
  virtual bool GenerateScriptAliasFunction(StringList &input,
                                           std::string &output) {
    return false;
  }
 
  virtual bool GenerateTypeSynthClass(StringList &input, std::string &output,
                                      const void *name_token = nullptr) {
    return false;
  }
 
  virtual bool GenerateTypeSynthClass(const char *oneliner, std::string &output,
                                      const void *name_token = nullptr) {
    return false;
  }
 
  virtual StructuredData::ObjectSP
  LoadPluginModule(const FileSpec &file_spec, lldb_private::Status &error) {
    return StructuredData::ObjectSP();
  }
 
  virtual StructuredData::DictionarySP
  GetDynamicSettings(StructuredData::ObjectSP plugin_module_sp, Target *target,
                     const char *setting_name, lldb_private::Status &error) {
    return StructuredData::DictionarySP();
  }
 
  virtual Status GenerateFunction(const char *signature,
                                  const StringList &input,
                                  bool is_callback) {
    return Status::FromErrorString("not implemented");
  }
 
  virtual void CollectDataForBreakpointCommandCallback(
      std::vector<std::reference_wrapper<BreakpointOptions>> &options,
      CommandReturnObject &result);
 
  virtual void
  CollectDataForWatchpointCommandCallback(WatchpointOptions *wp_options,
                                          CommandReturnObject &result);
 
  /// Set the specified text as the callback for the breakpoint.
  Status SetBreakpointCommandCallback(
      std::vector<std::reference_wrapper<BreakpointOptions>> &bp_options_vec,
      const char *callback_text);
 
  virtual Status SetBreakpointCommandCallback(BreakpointOptions &bp_options,
                                              const char *callback_text,
                                              bool is_callback) {
    return Status::FromErrorString("not implemented");
  }
 
  /// This one is for deserialization:
  virtual Status SetBreakpointCommandCallback(
      BreakpointOptions &bp_options,
      std::unique_ptr<BreakpointOptions::CommandData> &data_up) {
    return Status::FromErrorString("not implemented");
  }
 
  Status SetBreakpointCommandCallbackFunction(
      std::vector<std::reference_wrapper<BreakpointOptions>> &bp_options_vec,
      const char *function_name, StructuredData::ObjectSP extra_args_sp);
 
  /// Set a script function as the callback for the breakpoint.
  virtual Status
  SetBreakpointCommandCallbackFunction(BreakpointOptions &bp_options,
                                       const char *function_name,
                                       StructuredData::ObjectSP extra_args_sp) {
    return Status::FromErrorString("not implemented");
  }
 
  /// Set a one-liner as the callback for the watchpoint.
  virtual void SetWatchpointCommandCallback(WatchpointOptions *wp_options,
                                            const char *user_input,
                                            bool is_callback) {}
 
  virtual bool GetScriptedSummary(const char *function_name,
                                  lldb::ValueObjectSP valobj,
                                  StructuredData::ObjectSP &callee_wrapper_sp,
                                  const TypeSummaryOptions &options,
                                  std::string &retval) {
    return false;
  }
 
  // Calls the specified formatter matching Python function and returns its
  // result (true if it's a match, false if we should keep looking for a
  // matching formatter).
  virtual bool FormatterCallbackFunction(const char *function_name,
                                         lldb::TypeImplSP type_impl_sp) {
    return true;
  }
 
  virtual void Clear() {
    // Clean up any ref counts to SBObjects that might be in global variables
  }
 
  virtual bool
  RunScriptBasedCommand(const char *impl_function, llvm::StringRef args,
                        ScriptedCommandSynchronicity synchronicity,
                        lldb_private::CommandReturnObject &cmd_retobj,
                        Status &error,
                        const lldb_private::ExecutionContext &exe_ctx) {
    return false;
  }
 
  virtual bool RunScriptFormatKeyword(const char *impl_function,
                                      Process *process, std::string &output,
                                      Status &error) {
    error = Status::FromErrorString("unimplemented");
    return false;
  }
 
  virtual bool RunScriptFormatKeyword(const char *impl_function, Thread *thread,
                                      std::string &output, Status &error) {
    error = Status::FromErrorString("unimplemented");
    return false;
  }
 
  virtual bool RunScriptFormatKeyword(const char *impl_function, Target *target,
                                      std::string &output, Status &error) {
    error = Status::FromErrorString("unimplemented");
    return false;
  }
 
  virtual bool RunScriptFormatKeyword(const char *impl_function,
                                      StackFrame *frame, std::string &output,
                                      Status &error) {
    error = Status::FromErrorString("unimplemented");
    return false;
  }
 
  virtual bool RunScriptFormatKeyword(const char *impl_function,
                                      ValueObject *value, std::string &output,
                                      Status &error) {
    error = Status::FromErrorString("unimplemented");
    return false;
  }
 
  virtual bool GetDocumentationForItem(const char *item, std::string &dest) {
    dest.clear();
    return false;
  }
 
  virtual bool CheckObjectExists(const char *name) { return false; }
 
  virtual bool
  LoadScriptingModule(const char *filename, const LoadScriptOptions &options,
                      lldb_private::Status &error,
                      StructuredData::ObjectSP *module_sp = nullptr,
                      FileSpec extra_search_dir = {},
                      lldb::TargetSP loaded_into_target_sp = {});
 
  virtual bool IsReservedWord(const char *word) { return false; }
 
  virtual std::unique_ptr<ScriptInterpreterLocker> AcquireInterpreterLock();
 
  const char *GetScriptInterpreterPtyName();
 
  virtual llvm::Expected<unsigned>
  GetMaxPositionalArgumentsForCallable(const llvm::StringRef &callable_name) {
    return llvm::createStringError(
    llvm::inconvertibleErrorCode(), "Unimplemented function");
  }
 
  static std::string LanguageToString(lldb::ScriptLanguage language);
 
  static lldb::ScriptLanguage StringToLanguage(const llvm::StringRef &string);
 
  virtual llvm::Expected<std::string>
  ExtensionToImportPath(lldb::ScriptedExtension extension) {
    return llvm::make_error<UnimplementedError>();
  }
 
  static llvm::StringLiteral
  ExtensionToString(lldb::ScriptedExtension extension);
 
  static lldb::ScriptedExtension StringToExtension(llvm::StringRef string);
 
  lldb::ScriptLanguage GetLanguage() { return m_script_lang; }
 
  virtual lldb::ScriptedProcessInterfaceUP CreateScriptedProcessInterface() {
    return {};
  }
 
  virtual lldb::ScriptedThreadInterfaceSP CreateScriptedThreadInterface() {
    return {};
  }
 
  virtual lldb::ScriptedFrameInterfaceSP CreateScriptedFrameInterface() {
    return {};
  }
 
  virtual lldb::ScriptedFrameProviderInterfaceSP
  CreateScriptedFrameProviderInterface() {
    return {};
  }
 
  virtual lldb::ScriptedThreadPlanInterfaceSP
  CreateScriptedThreadPlanInterface() {
    return {};
  }
 
  virtual lldb::OperatingSystemInterfaceSP CreateOperatingSystemInterface() {
    return {};
  }
 
  virtual lldb::ScriptedPlatformInterfaceUP GetScriptedPlatformInterface() {
    return {};
  }
 
  virtual lldb::ScriptedHookInterfaceSP CreateScriptedHookInterface() {
    return {};
  }
 
  virtual lldb::ScriptedBreakpointInterfaceSP
  CreateScriptedBreakpointInterface() {
    return {};
  }
 
  virtual lldb::ScriptedStackFrameRecognizerInterfaceSP
  CreateScriptedStackFrameRecognizerInterface() {
    return {};
  }
 
  virtual lldb::ScriptedCommandInterfaceSP CreateScriptedCommandInterface() {
    return {};
  }
 
  virtual lldb::ScriptedStringSummaryInterfaceSP
  CreateScriptedStringSummaryInterface() {
    return {};
  }
 
  virtual lldb::ScriptedSyntheticChildrenInterfaceSP
  CreateScriptedSyntheticChildrenInterface() {
    return {};
  }
 
  virtual StructuredData::ObjectSP
  CreateStructuredDataFromScriptObject(ScriptObject obj) {
    return {};
  }
 
  /// Holds an lldb_private::Module name and a "sanitized" version
  /// of it for the purposes of loading a script of that name by
  /// the relevant ScriptInterpreter.
  ///
  /// E.g., for Python the sanitized name can't include:
  /// * Special characters: '-', ' ', '.'
  /// * Python keywords
  class SanitizedScriptingModuleName {
  public:
    SanitizedScriptingModuleName(std::string name, std::string sanitized_name,
                                 std::string conflicting_keyword)
        : m_original_name(std::move(name)),
          m_sanitized_name(std::move(sanitized_name)),
          m_conflicting_keyword(std::move(conflicting_keyword)) {}
 
    /// Returns \c true if this name is a keyword in the associated scripting
    /// language.
    bool IsKeyword() const { return !m_conflicting_keyword.empty(); }
 
    /// Returns \c true if the original name has been sanitized (i.e., required
    /// changes).
    bool RequiredSanitization() const {
      return m_sanitized_name != m_original_name;
    }
 
    llvm::StringRef GetSanitizedName() const { return m_sanitized_name; }
    llvm::StringRef GetOriginalName() const { return m_original_name; }
    llvm::StringRef GetConflictingKeyword() const {
      return m_conflicting_keyword;
    }
 
  private:
    std::string m_original_name;
    std::string m_sanitized_name;
 
    /// If the m_sanitized_name conflicts with a keyword for the
    /// ScriptInterpreter language associated with this
    /// SanitizedScriptingModuleName, is set to the conflicting keyword. Empty
    /// otherwise.
    std::string m_conflicting_keyword;
  };
 
  virtual SanitizedScriptingModuleName
  GetSanitizedScriptingModuleName(llvm::StringRef name);
 
  /// Get the debugger associated with this script interpreter.
  Debugger &GetDebugger() { return m_debugger; }
  const Debugger &GetDebugger() const { return m_debugger; }
 
protected:
  Debugger &m_debugger;
  lldb::ScriptLanguage m_script_lang;
};
 
} // namespace lldb_private
 
#endif // LLDB_INTERPRETER_SCRIPTINTERPRETER_H