[lldb] Add JSON serialization for FileSpec and FileSpecList

Add a `ToJSON` method in FileSpec and OptionValueFileSpecList to enable JSON serialization.

Author: da-viper

lldb/include/lldb/Interpreter/OptionValueFileSpecList.h

@@ -33,6 +33,8 @@ class OptionValueFileSpecList
   void DumpValue(const ExecutionContext *exe_ctx, Stream &strm,
                  uint32_t dump_mask) override;
 
+  llvm::json::Value ToJSON(const ExecutionContext *exe_ctx) override;
+
   Status
   SetValueFromString(llvm::StringRef value,
                      VarSetOperationType op = eVarSetOperationAssign) override;

lldb/include/lldb/Utility/FileSpec.h

@@ -18,6 +18,7 @@
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/FormatVariadic.h"
+#include "llvm/Support/JSON.h"
 #include "llvm/Support/Path.h"
 
 #include <cstddef>
@@ -214,6 +215,17 @@ class FileSpec {
   ///     The stream to which to dump the object description.
   void Dump(llvm::raw_ostream &s) const;
 
+  ///
+  /// Convert the filespec object to a json value.
+  ///
+  /// Convert the filespec object to a json value. If the object contains a
+  /// valid directory name, it will be displayed followed by a directory
+  /// delimiter, and the filename.
+  ///
+  /// \return
+  ///     A json value representation of a filespec.
+  llvm::json::Value ToJSON() const;
+
   Style GetPathStyle() const;
 
   /// Directory string const get accessor.

lldb/source/Interpreter/OptionValueFileSpecList.cpp

@@ -41,6 +41,16 @@ void OptionValueFileSpecList::DumpValue(const ExecutionContext *exe_ctx,
   }
 }
 
+llvm::json::Value
+OptionValueFileSpecList::ToJSON(const ExecutionContext *exe_ctx) {
+  std::lock_guard<std::recursive_mutex> lock(m_mutex);
+  llvm::json::Array spec_list;
+  for (const auto &file_spec : m_current_value) {
+    spec_list.emplace_back(file_spec.ToJSON());
+  }
+  return spec_list;
+}
+
 Status OptionValueFileSpecList::SetValueFromString(llvm::StringRef value,
                                                    VarSetOperationType op) {
   std::lock_guard<std::recursive_mutex> lock(m_mutex);

lldb/source/Utility/FileSpec.cpp

@@ -330,6 +330,13 @@ void FileSpec::Dump(llvm::raw_ostream &s) const {
     s << path_separator;
 }
 
+llvm::json::Value FileSpec::ToJSON() const {
+  std::string file_spec{};
+  llvm::raw_string_ostream stream(file_spec);
+  this->Dump(stream);
+  return llvm::json::Value(std::move(file_spec));
+}
+
 FileSpec::Style FileSpec::GetPathStyle() const { return m_style; }
 
 void FileSpec::SetDirectory(ConstString directory) {