lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionSourceCode.h

//===-- ClangExpressionSourceCode.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 liblldb_ClangExpressionSourceCode_h
#define liblldb_ClangExpressionSourceCode_h

#include "lldb/Expression/Expression.h"
#include "lldb/Expression/ExpressionSourceCode.h"
#include "lldb/lldb-enumerations.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringRef.h"

#include <string>

namespace lldb_private {

class ExecutionContext;

class ClangExpressionSourceCode : public ExpressionSourceCode {
public:
  /// The file name we use for the wrapper code that we inject before
  /// the user expression.
  static const llvm::StringRef g_prefix_file_name;
  static const char *g_expression_prefix;

  static ClangExpressionSourceCode *CreateWrapped(llvm::StringRef filename,
                                                  llvm::StringRef prefix,
                                                  llvm::StringRef body) {
    return new ClangExpressionSourceCode(filename, "$__lldb_expr", prefix, body,
                                         Wrap);
  }

  /// Generates the source code that will evaluate the expression.
  ///
  /// \param text output parameter containing the source code string.
  /// \param wrapping_language If the expression is supossed to be wrapped,
  ///        then this is the language that should be used for that.
  /// \param static_method True iff the expression is valuated inside a static
  ///        Objective-C method.
  /// \param exe_ctx The execution context in which the expression will be
  ///        evaluated.
  /// \param add_locals True iff local variables should be injected into the
  ///        expression source code.
  /// \param force_add_all_locals True iff all local variables should be
  ///        injected even if they are not used in the expression.
  /// \param modules A list of (C++) modules that the expression should import.
  ///
  /// \return true iff the source code was successfully generated.
  bool GetText(std::string &text, lldb::LanguageType wrapping_language,
               bool static_method, ExecutionContext &exe_ctx, bool add_locals,
               bool force_add_all_locals,
               llvm::ArrayRef<std::string> modules) const;

  // Given a string returned by GetText, find the beginning and end of the body
  // passed to CreateWrapped. Return true if the bounds could be found.  This
  // will also work on text with FixItHints applied.
  bool GetOriginalBodyBounds(std::string transformed_text,
                             lldb::LanguageType wrapping_language,
                             size_t &start_loc, size_t &end_loc);

protected:
  ClangExpressionSourceCode(llvm::StringRef filename, llvm::StringRef name,
                            llvm::StringRef prefix, llvm::StringRef body,
                            Wrapping wrap);

private:
  /// String marking the start of the user expression.
  std::string m_start_marker;
  /// String marking the end of the user expression.
  std::string m_end_marker;
};

} // namespace lldb_private

#endif