diff --git a/lldb/.clang-tidy b/lldb/.clang-tidy
index 53d48d5facdeb..e1f34ca5aa392 100644
--- a/lldb/.clang-tidy
+++ b/lldb/.clang-tidy
@@ -1,2 +1,7 @@
-Checks: '-readability-identifier-naming'
+Checks: '-readability-identifier-naming,modernize-use-default-member-init'
 InheritParentConfig: true
+CheckOptions:
+  - key:             modernize-use-default-member-init.IgnoreMacros
+    value:           '1'
+  - key:             modernize-use-default-member-init.UseAssignment
+    value:           '1'
diff --git a/lldb/include/lldb/API/SBBlock.h b/lldb/include/lldb/API/SBBlock.h
index be1ae18e9db53..2570099f7652f 100644
--- a/lldb/include/lldb/API/SBBlock.h
+++ b/lldb/include/lldb/API/SBBlock.h
@@ -87,7 +87,7 @@ class LLDB_API SBBlock {
   void AppendVariables(bool can_create, bool get_parent_variables,
                        lldb_private::VariableList *var_list);
 
-  lldb_private::Block *m_opaque_ptr;
+  lldb_private::Block *m_opaque_ptr = nullptr;
 };
 
 } // namespace lldb
diff --git a/lldb/include/lldb/API/SBBroadcaster.h b/lldb/include/lldb/API/SBBroadcaster.h
index 20756113793ab..046473d4223b6 100644
--- a/lldb/include/lldb/API/SBBroadcaster.h
+++ b/lldb/include/lldb/API/SBBroadcaster.h
@@ -77,7 +77,7 @@ class LLDB_API SBBroadcaster {
 
 private:
   lldb::BroadcasterSP m_opaque_sp;
-  lldb_private::Broadcaster *m_opaque_ptr;
+  lldb_private::Broadcaster *m_opaque_ptr = nullptr;
 };
 
 } // namespace lldb
diff --git a/lldb/include/lldb/API/SBCommunication.h b/lldb/include/lldb/API/SBCommunication.h
index 84c341c0dfef1..e407d859d8850 100644
--- a/lldb/include/lldb/API/SBCommunication.h
+++ b/lldb/include/lldb/API/SBCommunication.h
@@ -75,8 +75,8 @@ class LLDB_API SBCommunication {
   SBCommunication(const SBCommunication &) = delete;
   const SBCommunication &operator=(const SBCommunication &) = delete;
 
-  lldb_private::Communication *m_opaque;
-  bool m_opaque_owned;
+  lldb_private::Communication *m_opaque = nullptr;
+  bool m_opaque_owned = false;
 };
 
 } // namespace lldb
diff --git a/lldb/include/lldb/API/SBCompileUnit.h b/lldb/include/lldb/API/SBCompileUnit.h
index 0c05ef44e31c8..d965b9d966b9f 100644
--- a/lldb/include/lldb/API/SBCompileUnit.h
+++ b/lldb/include/lldb/API/SBCompileUnit.h
@@ -87,7 +87,7 @@ class LLDB_API SBCompileUnit {
 
   void reset(lldb_private::CompileUnit *lldb_object_ptr);
 
-  lldb_private::CompileUnit *m_opaque_ptr;
+  lldb_private::CompileUnit *m_opaque_ptr = nullptr;
 };
 
 } // namespace lldb
diff --git a/lldb/include/lldb/API/SBEvent.h b/lldb/include/lldb/API/SBEvent.h
index 08682b52cd23b..2ce1b60372b70 100644
--- a/lldb/include/lldb/API/SBEvent.h
+++ b/lldb/include/lldb/API/SBEvent.h
@@ -79,7 +79,7 @@ class LLDB_API SBEvent {
 
 private:
   mutable lldb::EventSP m_event_sp;
-  mutable lldb_private::Event *m_opaque_ptr;
+  mutable lldb_private::Event *m_opaque_ptr = nullptr;
 };
 
 } // namespace lldb
diff --git a/lldb/include/lldb/API/SBFunction.h b/lldb/include/lldb/API/SBFunction.h
index bd643a62206f4..71b372a818e4b 100644
--- a/lldb/include/lldb/API/SBFunction.h
+++ b/lldb/include/lldb/API/SBFunction.h
@@ -74,7 +74,7 @@ class LLDB_API SBFunction {
 
   SBFunction(lldb_private::Function *lldb_object_ptr);
 
-  lldb_private::Function *m_opaque_ptr;
+  lldb_private::Function *m_opaque_ptr = nullptr;
 };
 
 } // namespace lldb
diff --git a/lldb/include/lldb/API/SBListener.h b/lldb/include/lldb/API/SBListener.h
index 2144e7956b13e..eaa8b59d0c49b 100644
--- a/lldb/include/lldb/API/SBListener.h
+++ b/lldb/include/lldb/API/SBListener.h
@@ -100,7 +100,7 @@ class LLDB_API SBListener {
   void reset(lldb::ListenerSP listener_sp);
 
   lldb::ListenerSP m_opaque_sp;
-  lldb_private::Listener *m_unused_ptr;
+  lldb_private::Listener *m_unused_ptr = nullptr;
 };
 
 } // namespace lldb
diff --git a/lldb/include/lldb/API/SBStream.h b/lldb/include/lldb/API/SBStream.h
index a01fb0facc253..291109cbe93c3 100644
--- a/lldb/include/lldb/API/SBStream.h
+++ b/lldb/include/lldb/API/SBStream.h
@@ -105,7 +105,7 @@ class LLDB_API SBStream {
   SBStream(const SBStream &) = delete;
   const SBStream &operator=(const SBStream &) = delete;
   std::unique_ptr<lldb_private::Stream> m_opaque_up;
-  bool m_is_file;
+  bool m_is_file = false;
 };
 
 } // namespace lldb
diff --git a/lldb/include/lldb/API/SBSymbol.h b/lldb/include/lldb/API/SBSymbol.h
index 66f73c82a73a5..5935ccfed0245 100644
--- a/lldb/include/lldb/API/SBSymbol.h
+++ b/lldb/include/lldb/API/SBSymbol.h
@@ -78,7 +78,7 @@ class LLDB_API SBSymbol {
 
   void SetSymbol(lldb_private::Symbol *lldb_object_ptr);
 
-  lldb_private::Symbol *m_opaque_ptr;
+  lldb_private::Symbol *m_opaque_ptr = nullptr;
 };
 
 } // namespace lldb
diff --git a/lldb/include/lldb/Breakpoint/BreakpointOptions.h b/lldb/include/lldb/Breakpoint/BreakpointOptions.h
index 85b8e025a8e52..7b78265920a2e 100644
--- a/lldb/include/lldb/Breakpoint/BreakpointOptions.h
+++ b/lldb/include/lldb/Breakpoint/BreakpointOptions.h
@@ -43,9 +43,7 @@ friend class Breakpoint;
                      | eCondition | eAutoContinue)
   };
   struct CommandData {
-    CommandData()
-        : user_source(), script_source(),
-          interpreter(lldb::eScriptLanguageNone), stop_on_error(true) {}
+    CommandData() : user_source(), script_source() {}
 
     CommandData(const StringList &user_source, lldb::ScriptLanguage interp)
         : user_source(user_source), script_source(), interpreter(interp),
@@ -63,9 +61,10 @@ friend class Breakpoint;
 
     StringList user_source;
     std::string script_source;
-    enum lldb::ScriptLanguage
-        interpreter; // eScriptLanguageNone means command interpreter.
-    bool stop_on_error;
+    enum lldb::ScriptLanguage interpreter =
+        lldb::eScriptLanguageNone; // eScriptLanguageNone means command
+                                   // interpreter.
+    bool stop_on_error = true;
 
   private:
     enum class OptionNames : uint32_t {
diff --git a/lldb/include/lldb/Breakpoint/Stoppoint.h b/lldb/include/lldb/Breakpoint/Stoppoint.h
index 36df77c4e91a7..6bb1b6a705bc2 100644
--- a/lldb/include/lldb/Breakpoint/Stoppoint.h
+++ b/lldb/include/lldb/Breakpoint/Stoppoint.h
@@ -33,7 +33,7 @@ class Stoppoint {
   void SetID(lldb::break_id_t bid);
 
 protected:
-  lldb::break_id_t m_bid;
+  lldb::break_id_t m_bid = LLDB_INVALID_BREAK_ID;
 
 private:
   // For Stoppoint only
diff --git a/lldb/include/lldb/Breakpoint/StoppointCallbackContext.h b/lldb/include/lldb/Breakpoint/StoppointCallbackContext.h
index db02ddd494fb2..6da8d10d3f335 100644
--- a/lldb/include/lldb/Breakpoint/StoppointCallbackContext.h
+++ b/lldb/include/lldb/Breakpoint/StoppointCallbackContext.h
@@ -37,13 +37,14 @@ class StoppointCallbackContext {
   void Clear();
 
   // Member variables
-  Event *event; // This is the event, the callback can modify this to indicate
-                // the meaning of the breakpoint hit
+  Event *event = nullptr; // This is the event, the callback can modify this to
+                          // indicate the meaning of the breakpoint hit
   ExecutionContextRef
       exe_ctx_ref;     // This tells us where we have stopped, what thread.
-  bool is_synchronous; // Is the callback being executed synchronously with the
-                       // breakpoint,
-                       // or asynchronously as the event is retrieved?
+  bool is_synchronous =
+      false; // Is the callback being executed synchronously with the
+             // breakpoint,
+             // or asynchronously as the event is retrieved?
 };
 
 } // namespace lldb_private
diff --git a/lldb/include/lldb/Breakpoint/WatchpointList.h b/lldb/include/lldb/Breakpoint/WatchpointList.h
index 283f991b178a0..6f224b641396c 100644
--- a/lldb/include/lldb/Breakpoint/WatchpointList.h
+++ b/lldb/include/lldb/Breakpoint/WatchpointList.h
@@ -198,7 +198,7 @@ class WatchpointList {
   wp_collection m_watchpoints;
   mutable std::recursive_mutex m_mutex;
 
-  lldb::watch_id_t m_next_wp_id;
+  lldb::watch_id_t m_next_wp_id = 0;
 };
 
 } // namespace lldb_private
diff --git a/lldb/include/lldb/Breakpoint/WatchpointOptions.h b/lldb/include/lldb/Breakpoint/WatchpointOptions.h
index 0a18c52d36d0a..fbfcb91c4249e 100644
--- a/lldb/include/lldb/Breakpoint/WatchpointOptions.h
+++ b/lldb/include/lldb/Breakpoint/WatchpointOptions.h
@@ -166,13 +166,13 @@ class WatchpointOptions {
                            lldb::user_id_t watch_id);
 
   struct CommandData {
-    CommandData() : user_source(), script_source(), stop_on_error(true) {}
+    CommandData() : user_source(), script_source() {}
 
     ~CommandData() = default;
 
     StringList user_source;
     std::string script_source;
-    bool stop_on_error;
+    bool stop_on_error = true;
   };
 
   class CommandBaton : public TypedBaton<CommandData> {
@@ -191,7 +191,7 @@ class WatchpointOptions {
   // For WatchpointOptions only
   WatchpointHitCallback m_callback;  // This is the callback function pointer
   lldb::BatonSP m_callback_baton_sp; // This is the client data for the callback
-  bool m_callback_is_synchronous;
+  bool m_callback_is_synchronous = false;
   std::unique_ptr<ThreadSpec>
       m_thread_spec_up; // Thread for which this watchpoint will take
 };
diff --git a/lldb/include/lldb/Core/Address.h b/lldb/include/lldb/Core/Address.h
index c9734e78ec0f0..ec393a1871e35 100644
--- a/lldb/include/lldb/Core/Address.h
+++ b/lldb/include/lldb/Core/Address.h
@@ -116,7 +116,7 @@ class Address {
   ///
   /// Initialize with a invalid section (NULL) and an invalid offset
   /// (LLDB_INVALID_ADDRESS).
-  Address() : m_section_wp(), m_offset(LLDB_INVALID_ADDRESS) {}
+  Address() : m_section_wp() {}
 
   /// Copy constructor
   ///
@@ -487,7 +487,8 @@ class Address {
 protected:
   // Member variables.
   lldb::SectionWP m_section_wp; ///< The section for the address, can be NULL.
-  lldb::addr_t m_offset; ///< Offset into section if \a m_section_wp is valid...
+  lldb::addr_t m_offset = LLDB_INVALID_ADDRESS; ///< Offset into section if \a
+                                                ///< m_section_wp is valid...
 
   // Returns true if the m_section_wp once had a reference to a valid section
   // shared pointer, but no longer does. This can happen if we have an address
diff --git a/lldb/include/lldb/Core/AddressRange.h b/lldb/include/lldb/Core/AddressRange.h
index f14a9e9412152..6fbdc35c91684 100644
--- a/lldb/include/lldb/Core/AddressRange.h
+++ b/lldb/include/lldb/Core/AddressRange.h
@@ -239,7 +239,7 @@ class AddressRange {
 protected:
   // Member variables
   Address m_base_addr;      ///< The section offset base address of this range.
-  lldb::addr_t m_byte_size; ///< The size in bytes of this address range.
+  lldb::addr_t m_byte_size = 0; ///< The size in bytes of this address range.
 };
 
 // bool operator== (const AddressRange& lhs, const AddressRange& rhs);
diff --git a/lldb/include/lldb/Core/Declaration.h b/lldb/include/lldb/Core/Declaration.h
index 5df8034ae3c4b..f81de21bc8f8b 100644
--- a/lldb/include/lldb/Core/Declaration.h
+++ b/lldb/include/lldb/Core/Declaration.h
@@ -24,7 +24,7 @@ namespace lldb_private {
 class Declaration {
 public:
   /// Default constructor.
-  Declaration() : m_file(), m_line(0), m_column(LLDB_INVALID_COLUMN_NUMBER) {}
+  Declaration() : m_file() {}
 
   /// Construct with file specification, and optional line and column.
   ///
@@ -182,10 +182,10 @@ class Declaration {
   FileSpec m_file;
   /// Non-zero values indicates a valid line number, zero indicates no line
   /// number information is available.
-  uint32_t m_line;
+  uint32_t m_line = 0;
   /// Non-zero values indicates a valid column number, zero indicates no column
   /// information is available.
-  uint16_t m_column;
+  uint16_t m_column = LLDB_INVALID_COLUMN_NUMBER;
 };
 
 bool operator==(const Declaration &lhs, const Declaration &rhs);
diff --git a/lldb/include/lldb/Core/Disassembler.h b/lldb/include/lldb/Core/Disassembler.h
index e33ddcf13229c..622c23ff64928 100644
--- a/lldb/include/lldb/Core/Disassembler.h
+++ b/lldb/include/lldb/Core/Disassembler.h
@@ -454,10 +454,10 @@ class Disassembler : public std::enable_shared_from_this<Disassembler>,
 
   struct SourceLine {
     FileSpec file;
-    uint32_t line;
-    uint32_t column;
+    uint32_t line = LLDB_INVALID_LINE_NUMBER;
+    uint32_t column = 0;
 
-    SourceLine() : file(), line(LLDB_INVALID_LINE_NUMBER), column(0) {}
+    SourceLine() : file() {}
 
     bool operator==(const SourceLine &rhs) const {
       return file == rhs.file && line == rhs.line && rhs.column == column;
@@ -476,14 +476,12 @@ class Disassembler : public std::enable_shared_from_this<Disassembler>,
     // index of the "current" source line, if we want to highlight that when
     // displaying the source lines.  (as opposed to the surrounding source
     // lines provided to give context)
-    size_t current_source_line;
+    size_t current_source_line = -1;
 
     // Whether to print a blank line at the end of the source lines.
-    bool print_source_context_end_eol;
+    bool print_source_context_end_eol = true;
 
-    SourceLinesToDisplay()
-        : lines(), current_source_line(-1), print_source_context_end_eol(true) {
-    }
+    SourceLinesToDisplay() : lines() {}
   };
 
   // Get the function's declaration line number, hopefully a line number
diff --git a/lldb/include/lldb/Core/EmulateInstruction.h b/lldb/include/lldb/Core/EmulateInstruction.h
index 58cd3e8eb4dfc..b3e837d78a442 100644
--- a/lldb/include/lldb/Core/EmulateInstruction.h
+++ b/lldb/include/lldb/Core/EmulateInstruction.h
@@ -182,8 +182,8 @@ class EmulateInstruction : public PluginInterface {
   } InfoType;
 
   struct Context {
-    ContextType type;
-    enum InfoType info_type;
+    ContextType type = eContextInvalid;
+    enum InfoType info_type = eInfoTypeNoArgs;
     union {
       struct RegisterPlusOffset {
         RegisterInfo reg;      // base register
@@ -237,7 +237,7 @@ class EmulateInstruction : public PluginInterface {
       uint32_t isa;
     } info;
 
-    Context() : type(eContextInvalid), info_type(eInfoTypeNoArgs) {}
+    Context() {}
 
     void SetRegisterPlusOffset(RegisterInfo base_reg, int64_t signed_offset) {
       info_type = eInfoTypeRegisterPlusOffset;
diff --git a/lldb/include/lldb/Core/FileLineResolver.h b/lldb/include/lldb/Core/FileLineResolver.h
index d28cc117040ee..16b1db1b50c46 100644
--- a/lldb/include/lldb/Core/FileLineResolver.h
+++ b/lldb/include/lldb/Core/FileLineResolver.h
@@ -28,8 +28,8 @@ class FileLineResolver : public Searcher {
 public:
   FileLineResolver()
       : m_file_spec(),
-        m_line_number(UINT32_MAX), // Set this to zero for all lines in a file
-        m_sc_list(), m_inlines(true) {}
+        // Set this to zero for all lines in a file
+        m_sc_list() {}
 
   FileLineResolver(const FileSpec &resolver, uint32_t line_no,
                    bool check_inlines);
@@ -52,10 +52,11 @@ class FileLineResolver : public Searcher {
 
 protected:
   FileSpec m_file_spec;   // This is the file spec we are looking for.
-  uint32_t m_line_number; // This is the line number that we are looking for.
+  uint32_t m_line_number =
+      UINT32_MAX; // This is the line number that we are looking for.
   SymbolContextList m_sc_list;
-  bool m_inlines; // This determines whether the resolver looks for inlined
-                  // functions or not.
+  bool m_inlines = true; // This determines whether the resolver looks for
+                         // inlined functions or not.
 
 private:
   FileLineResolver(const FileLineResolver &) = delete;
diff --git a/lldb/include/lldb/Core/FormatEntity.h b/lldb/include/lldb/Core/FormatEntity.h
index ca8ecda5b5677..ecae8500df40d 100644
--- a/lldb/include/lldb/Core/FormatEntity.h
+++ b/lldb/include/lldb/Core/FormatEntity.h
@@ -128,7 +128,7 @@ class FormatEntity {
 
       constexpr Definition(const char *name, const FormatEntity::Entry::Type t,
                            const uint64_t data)
-          : name(name), string(nullptr), type(t), data(data) {}
+          : name(name), type(t), data(data) {}
 
       constexpr Definition(const char *name, const FormatEntity::Entry::Type t,
                            const uint64_t num_children,
@@ -148,8 +148,7 @@ class FormatEntity {
 
     Entry(Type t = Type::Invalid, const char *s = nullptr,
           const char *f = nullptr)
-        : string(s ? s : ""), printf_format(f ? f : ""), children(), type(t),
-          fmt(lldb::eFormatDefault), number(0), deref(false) {}
+        : string(s ? s : ""), printf_format(f ? f : ""), children(), type(t) {}
 
     Entry(llvm::StringRef s);
     Entry(char ch);
@@ -202,9 +201,9 @@ class FormatEntity {
     std::string printf_format;
     std::vector<Entry> children;
     Type type;
-    lldb::Format fmt;
-    lldb::addr_t number;
-    bool deref;
+    lldb::Format fmt = lldb::eFormatDefault;
+    lldb::addr_t number = 0;
+    bool deref = false;
   };
 
   static bool Format(const Entry &entry, Stream &s, const SymbolContext *sc,
diff --git a/lldb/include/lldb/Core/LoadedModuleInfoList.h b/lldb/include/lldb/Core/LoadedModuleInfoList.h
index 49400f7f4908c..ad6da2bd75592 100644
--- a/lldb/include/lldb/Core/LoadedModuleInfoList.h
+++ b/lldb/include/lldb/Core/LoadedModuleInfoList.h
@@ -101,14 +101,14 @@ class LoadedModuleInfoList {
     lldb::addr_t m_dynamic;
   };
 
-  LoadedModuleInfoList() : m_list(), m_link_map(LLDB_INVALID_ADDRESS) {}
+  LoadedModuleInfoList() : m_list() {}
 
   void add(const LoadedModuleInfo &mod) { m_list.push_back(mod); }
 
   void clear() { m_list.clear(); }
 
   std::vector<LoadedModuleInfo> m_list;
-  lldb::addr_t m_link_map;
+  lldb::addr_t m_link_map = LLDB_INVALID_ADDRESS;
 };
 } // namespace lldb_private
 
diff --git a/lldb/include/lldb/Core/MappedHash.h b/lldb/include/lldb/Core/MappedHash.h
index 58634e5137278..7bd3c3a784490 100644
--- a/lldb/include/lldb/Core/MappedHash.h
+++ b/lldb/include/lldb/Core/MappedHash.h
@@ -47,19 +47,17 @@ class MappedHash {
 
     uint32_t
         magic; // HASH_MAGIC or HASH_CIGAM magic value to allow endian detection
-    uint16_t version;         // Version number
-    uint16_t hash_function;   // The hash function enumeration that was used
-    uint32_t bucket_count;    // The number of buckets in this hash table
-    uint32_t hashes_count;    // The total number of unique hash values and hash
-                              // data offsets in this table
+    uint16_t version = 1; // Version number
+    uint16_t hash_function =
+        eHashFunctionDJB;      // The hash function enumeration that was used
+    uint32_t bucket_count = 0; // The number of buckets in this hash table
+    uint32_t hashes_count = 0; // The total number of unique hash values and
+                               // hash data offsets in this table
     uint32_t header_data_len; // The size in bytes of the "header_data" template
                               // member below
     HeaderData header_data;   //
 
-    Header()
-        : magic(HASH_MAGIC), version(1), hash_function(eHashFunctionDJB),
-          bucket_count(0), hashes_count(0), header_data_len(sizeof(T)),
-          header_data() {}
+    Header() : magic(HASH_MAGIC), header_data_len(sizeof(T)), header_data() {}
 
     virtual ~Header() = default;
 
diff --git a/lldb/include/lldb/Core/Module.h b/lldb/include/lldb/Core/Module.h
index c848c6997eba4..a9ec1e890dabd 100644
--- a/lldb/include/lldb/Core/Module.h
+++ b/lldb/include/lldb/Core/Module.h
@@ -885,10 +885,7 @@ class Module : public std::enable_shared_from_this<Module>,
   /// correctly.
   class LookupInfo {
   public:
-    LookupInfo()
-        : m_name(), m_lookup_name(), m_language(lldb::eLanguageTypeUnknown),
-          m_name_type_mask(lldb::eFunctionNameTypeNone),
-          m_match_name_after_lookup(false) {}
+    LookupInfo() : m_name(), m_lookup_name() {}
 
     LookupInfo(ConstString name, lldb::FunctionNameType name_type_mask,
                lldb::LanguageType language);
@@ -917,15 +914,15 @@ class Module : public std::enable_shared_from_this<Module>,
     ConstString m_lookup_name;
 
     /// Limit matches to only be for this language
-    lldb::LanguageType m_language;
+    lldb::LanguageType m_language = lldb::eLanguageTypeUnknown;
 
     /// One or more bits from lldb::FunctionNameType that indicate what kind of
     /// names we are looking for
-    lldb::FunctionNameType m_name_type_mask;
+    lldb::FunctionNameType m_name_type_mask = lldb::eFunctionNameTypeNone;
 
     ///< If \b true, then demangled names that match will need to contain
     ///< "m_name" in order to be considered a match
-    bool m_match_name_after_lookup;
+    bool m_match_name_after_lookup = false;
   };
 
 protected:
@@ -952,7 +949,7 @@ class Module : public std::enable_shared_from_this<Module>,
   ConstString m_object_name; ///< The name an object within this module that is
                              ///selected, or empty of the module is represented
                              ///by \a m_file.
-  uint64_t m_object_offset;
+  uint64_t m_object_offset = 0;
   llvm::sys::TimePoint<> m_object_mod_time;
 
   /// DataBuffer containing the module image, if it was provided at
diff --git a/lldb/include/lldb/Core/ModuleList.h b/lldb/include/lldb/Core/ModuleList.h
index 46ad44359fa1b..07dddd18357b7 100644
--- a/lldb/include/lldb/Core/ModuleList.h
+++ b/lldb/include/lldb/Core/ModuleList.h
@@ -471,7 +471,7 @@ class ModuleList {
   collection m_modules; ///< The collection of modules.
   mutable std::recursive_mutex m_modules_mutex;
 
-  Notifier *m_notifier;
+  Notifier *m_notifier = nullptr;
 
 public:
   typedef LockingAdaptedIterable<collection, lldb::ModuleSP, vector_adapter,
diff --git a/lldb/include/lldb/Core/ModuleSpec.h b/lldb/include/lldb/Core/ModuleSpec.h
index d159eaf6ff485..8e5deebbab9a7 100644
--- a/lldb/include/lldb/Core/ModuleSpec.h
+++ b/lldb/include/lldb/Core/ModuleSpec.h
@@ -27,8 +27,7 @@ class ModuleSpec {
 public:
   ModuleSpec()
       : m_file(), m_platform_file(), m_symbol_file(), m_arch(), m_uuid(),
-        m_object_name(), m_object_offset(0), m_object_size(0),
-        m_source_mappings() {}
+        m_object_name(), m_source_mappings() {}
 
   /// If the \c data argument is passed, its contents will be used
   /// as the module contents instead of trying to read them from
@@ -271,8 +270,8 @@ class ModuleSpec {
   ArchSpec m_arch;
   UUID m_uuid;
   ConstString m_object_name;
-  uint64_t m_object_offset;
-  uint64_t m_object_size;
+  uint64_t m_object_offset = 0;
+  uint64_t m_object_size = 0;
   llvm::sys::TimePoint<> m_object_mod_time;
   mutable PathMappingList m_source_mappings;
   lldb::DataBufferSP m_data = {};
diff --git a/lldb/include/lldb/Core/Opcode.h b/lldb/include/lldb/Core/Opcode.h
index 005c3a440b17d..9ecf4d0848424 100644
--- a/lldb/include/lldb/Core/Opcode.h
+++ b/lldb/include/lldb/Core/Opcode.h
@@ -38,7 +38,7 @@ class Opcode {
     eTypeBytes
   };
 
-  Opcode() : m_byte_order(lldb::eByteOrderInvalid), m_type(eTypeInvalid) {}
+  Opcode() {}
 
   Opcode(uint8_t inst, lldb::ByteOrder order)
       : m_byte_order(order), m_type(eType8) {
@@ -252,9 +252,9 @@ class Opcode {
             endian::InlHostByteOrder() == lldb::eByteOrderBig);
   }
 
-  lldb::ByteOrder m_byte_order;
+  lldb::ByteOrder m_byte_order = lldb::eByteOrderInvalid;
 
-  Opcode::Type m_type;
+  Opcode::Type m_type = eTypeInvalid;
   union {
     uint8_t inst8;
     uint16_t inst16;
diff --git a/lldb/include/lldb/Core/RichManglingContext.h b/lldb/include/lldb/Core/RichManglingContext.h
index 61616d9ac27a4..48102ec0b1cf8 100644
--- a/lldb/include/lldb/Core/RichManglingContext.h
+++ b/lldb/include/lldb/Core/RichManglingContext.h
@@ -24,7 +24,7 @@ namespace lldb_private {
 /// providers. See Mangled::DemangleWithRichManglingInfo()
 class RichManglingContext {
 public:
-  RichManglingContext() : m_provider(None), m_ipd_buf_size(2048) {
+  RichManglingContext() {
     m_ipd_buf = static_cast<char *>(std::malloc(m_ipd_buf_size));
     m_ipd_buf[0] = '\0';
   }
@@ -70,7 +70,7 @@ class RichManglingContext {
   enum InfoProvider { None, ItaniumPartialDemangler, PluginCxxLanguage };
 
   /// Selects the rich mangling info provider.
-  InfoProvider m_provider;
+  InfoProvider m_provider = None;
 
   /// Reference to the buffer used for results of ParseXy() operations.
   llvm::StringRef m_buffer;
@@ -81,7 +81,7 @@ class RichManglingContext {
   /// ItaniumPartialDemangler. It should be managed with malloc/free, not
   /// new/delete.
   char *m_ipd_buf;
-  size_t m_ipd_buf_size;
+  size_t m_ipd_buf_size = 2048;
 
   /// Members for PluginCxxLanguage
   /// Cannot forward declare inner class CPlusPlusLanguage::MethodName. The
diff --git a/lldb/include/lldb/Core/Value.h b/lldb/include/lldb/Core/Value.h
index dced9938ca545..1ee4fe639e6e9 100644
--- a/lldb/include/lldb/Core/Value.h
+++ b/lldb/include/lldb/Core/Value.h
@@ -148,9 +148,9 @@ class Value {
 protected:
   Scalar m_value;
   CompilerType m_compiler_type;
-  void *m_context;
-  ValueType m_value_type;
-  ContextType m_context_type;
+  void *m_context = nullptr;
+  ValueType m_value_type = ValueType::Scalar;
+  ContextType m_context_type = ContextType::Invalid;
   DataBufferHeap m_data_buffer;
 };
 
diff --git a/lldb/include/lldb/Core/ValueObject.h b/lldb/include/lldb/Core/ValueObject.h
index caad9612909e7..5f1cbc65b3200 100644
--- a/lldb/include/lldb/Core/ValueObject.h
+++ b/lldb/include/lldb/Core/ValueObject.h
@@ -318,7 +318,7 @@ class ValueObject {
     ProcessModID m_mod_id; // This is the stop id when this ValueObject was last
                            // evaluated.
     ExecutionContextRef m_exe_ctx_ref;
-    bool m_needs_update;
+    bool m_needs_update = true;
   };
 
   virtual ~ValueObject();
@@ -795,7 +795,7 @@ class ValueObject {
 
   class ChildrenManager {
   public:
-    ChildrenManager() : m_mutex(), m_children(), m_children_count(0) {}
+    ChildrenManager() : m_mutex(), m_children() {}
 
     bool HasChildAtIndex(size_t idx) {
       std::lock_guard<std::recursive_mutex> guard(m_mutex);
@@ -831,7 +831,7 @@ class ValueObject {
     typedef ChildrenMap::value_type ChildrenPair;
     std::recursive_mutex m_mutex;
     ChildrenMap m_children;
-    size_t m_children_count;
+    size_t m_children_count = 0;
   };
 
   // Classes that inherit from ValueObject can see and modify these
diff --git a/lldb/include/lldb/DataFormatters/DumpValueObjectOptions.h b/lldb/include/lldb/DataFormatters/DumpValueObjectOptions.h
index 4d54f03a2e03c..5c3176dfc5943 100644
--- a/lldb/include/lldb/DataFormatters/DumpValueObjectOptions.h
+++ b/lldb/include/lldb/DataFormatters/DumpValueObjectOptions.h
@@ -35,12 +35,11 @@ class DumpValueObjectOptions {
   };
 
   struct PointerAsArraySettings {
-    size_t m_element_count;
-    size_t m_base_element;
-    size_t m_stride;
+    size_t m_element_count = 0;
+    size_t m_base_element = 0;
+    size_t m_stride = 0;
 
-    PointerAsArraySettings()
-        : m_element_count(0), m_base_element(0), m_stride() {}
+    PointerAsArraySettings() {}
 
     PointerAsArraySettings(size_t elem_count, size_t base_elem = 0,
                            size_t stride = 1)
diff --git a/lldb/include/lldb/DataFormatters/FormatClasses.h b/lldb/include/lldb/DataFormatters/FormatClasses.h
index e3989133a602e..b8540de3d7408 100644
--- a/lldb/include/lldb/DataFormatters/FormatClasses.h
+++ b/lldb/include/lldb/DataFormatters/FormatClasses.h
@@ -105,7 +105,7 @@ class FormattersMatchData {
 
 class TypeNameSpecifierImpl {
 public:
-  TypeNameSpecifierImpl() : m_is_regex(false), m_type() {}
+  TypeNameSpecifierImpl() : m_type() {}
 
   TypeNameSpecifierImpl(llvm::StringRef name, bool is_regex)
       : m_is_regex(is_regex), m_type() {
@@ -143,7 +143,7 @@ class TypeNameSpecifierImpl {
   bool IsRegex() { return m_is_regex; }
 
 private:
-  bool m_is_regex;
+  bool m_is_regex = false;
   // TODO: Replace this with TypeAndOrName.
   struct TypeOrName {
     std::string m_type_name;
diff --git a/lldb/include/lldb/DataFormatters/TypeFormat.h b/lldb/include/lldb/DataFormatters/TypeFormat.h
index b8ed6a3443b3e..4e19d4cb14a17 100644
--- a/lldb/include/lldb/DataFormatters/TypeFormat.h
+++ b/lldb/include/lldb/DataFormatters/TypeFormat.h
@@ -25,7 +25,7 @@ class TypeFormatImpl {
 public:
   class Flags {
   public:
-    Flags() : m_flags(lldb::eTypeOptionCascade) {}
+    Flags() {}
 
     Flags(const Flags &other) : m_flags(other.m_flags) {}
 
@@ -104,7 +104,7 @@ class TypeFormatImpl {
     void SetValue(uint32_t value) { m_flags = value; }
 
   private:
-    uint32_t m_flags;
+    uint32_t m_flags = lldb::eTypeOptionCascade;
   };
 
   TypeFormatImpl(const Flags &flags = Flags());
@@ -149,7 +149,7 @@ class TypeFormatImpl {
 
 protected:
   Flags m_flags;
-  uint32_t m_my_revision;
+  uint32_t m_my_revision = 0;
 
 private:
   TypeFormatImpl(const TypeFormatImpl &) = delete;
diff --git a/lldb/include/lldb/DataFormatters/TypeSummary.h b/lldb/include/lldb/DataFormatters/TypeSummary.h
index 48480d1d7e456..4c60aa6f09ef8 100644
--- a/lldb/include/lldb/DataFormatters/TypeSummary.h
+++ b/lldb/include/lldb/DataFormatters/TypeSummary.h
@@ -38,8 +38,8 @@ class TypeSummaryOptions {
   TypeSummaryOptions &SetCapping(lldb::TypeSummaryCapping);
 
 private:
-  lldb::LanguageType m_lang;
-  lldb::TypeSummaryCapping m_capping;
+  lldb::LanguageType m_lang = lldb::eLanguageTypeUnknown;
+  lldb::TypeSummaryCapping m_capping = lldb::eTypeSummaryCapped;
 };
 
 class TypeSummaryImpl {
@@ -52,7 +52,7 @@ class TypeSummaryImpl {
 
   class Flags {
   public:
-    Flags() : m_flags(lldb::eTypeOptionCascade) {}
+    Flags() {}
 
     Flags(const Flags &other) : m_flags(other.m_flags) {}
 
@@ -196,7 +196,7 @@ class TypeSummaryImpl {
     void SetValue(uint32_t value) { m_flags = value; }
 
   private:
-    uint32_t m_flags;
+    uint32_t m_flags = lldb::eTypeOptionCascade;
   };
 
   bool Cascades() const { return m_flags.GetCascades(); }
diff --git a/lldb/include/lldb/DataFormatters/TypeSynthetic.h b/lldb/include/lldb/DataFormatters/TypeSynthetic.h
index ea49e48a2d626..96b34c9f3020a 100644
--- a/lldb/include/lldb/DataFormatters/TypeSynthetic.h
+++ b/lldb/include/lldb/DataFormatters/TypeSynthetic.h
@@ -133,7 +133,7 @@ class SyntheticChildren {
 public:
   class Flags {
   public:
-    Flags() : m_flags(lldb::eTypeOptionCascade) {}
+    Flags() {}
 
     Flags(const Flags &other) : m_flags(other.m_flags) {}
 
@@ -225,7 +225,7 @@ class SyntheticChildren {
     void SetValue(uint32_t value) { m_flags = value; }
 
   private:
-    uint32_t m_flags;
+    uint32_t m_flags = lldb::eTypeOptionCascade;
   };
 
   SyntheticChildren(const Flags &flags) : m_flags(flags) {}
diff --git a/lldb/include/lldb/Expression/DWARFExpression.h b/lldb/include/lldb/Expression/DWARFExpression.h
index c7d4e4b1882fd..1490ac2d614a8 100644
--- a/lldb/include/lldb/Expression/DWARFExpression.h
+++ b/lldb/include/lldb/Expression/DWARFExpression.h
@@ -250,10 +250,10 @@ class DWARFExpression {
   /// The DWARF compile unit this expression belongs to. It is used to evaluate
   /// values indexing into the .debug_addr section (e.g. DW_OP_GNU_addr_index,
   /// DW_OP_GNU_const_index)
-  const DWARFUnit *m_dwarf_cu;
+  const DWARFUnit *m_dwarf_cu = nullptr;
 
   /// One of the defines that starts with LLDB_REGKIND_
-  lldb::RegisterKind m_reg_kind;
+  lldb::RegisterKind m_reg_kind = lldb::eRegisterKindDWARF;
 
   struct LoclistAddresses {
     lldb::addr_t cu_file_addr;
diff --git a/lldb/include/lldb/Expression/Materializer.h b/lldb/include/lldb/Expression/Materializer.h
index 754e67c5dfa7a..f60e0fbe513f8 100644
--- a/lldb/include/lldb/Expression/Materializer.h
+++ b/lldb/include/lldb/Expression/Materializer.h
@@ -90,7 +90,7 @@ class Materializer {
 
   class Entity {
   public:
-    Entity() : m_alignment(1), m_size(0), m_offset(0) {}
+    Entity() {}
 
     virtual ~Entity() = default;
 
@@ -113,9 +113,9 @@ class Materializer {
     void SetOffset(uint32_t offset) { m_offset = offset; }
 
   protected:
-    uint32_t m_alignment;
-    uint32_t m_size;
-    uint32_t m_offset;
+    uint32_t m_alignment = 1;
+    uint32_t m_size = 0;
+    uint32_t m_offset = 0;
   };
 
 private:
diff --git a/lldb/include/lldb/Host/File.h b/lldb/include/lldb/Host/File.h
index 28d5d9d09ca5e..d364d954a1c16 100644
--- a/lldb/include/lldb/Host/File.h
+++ b/lldb/include/lldb/Host/File.h
@@ -65,10 +65,7 @@ class File : public IOObject {
   static llvm::Expected<const char *>
   GetStreamOpenModeFromOptions(OpenOptions options);
 
-  File()
-      : IOObject(eFDTypeFile), m_is_interactive(eLazyBoolCalculate),
-        m_is_real_terminal(eLazyBoolCalculate),
-        m_supports_colors(eLazyBoolCalculate){};
+  File() : IOObject(eFDTypeFile){};
 
   /// Read bytes from a file from the current file position into buf.
   ///
@@ -360,9 +357,9 @@ class File : public IOObject {
   static bool classof(const File *file) { return file->isA(&ID); }
 
 protected:
-  LazyBool m_is_interactive;
-  LazyBool m_is_real_terminal;
-  LazyBool m_supports_colors;
+  LazyBool m_is_interactive = eLazyBoolCalculate;
+  LazyBool m_is_real_terminal = eLazyBoolCalculate;
+  LazyBool m_supports_colors = eLazyBoolCalculate;
 
   void CalculateInteractiveAndTerminal();
 
@@ -373,9 +370,7 @@ class File : public IOObject {
 
 class NativeFile : public File {
 public:
-  NativeFile()
-      : m_descriptor(kInvalidDescriptor), m_own_descriptor(false),
-        m_stream(kInvalidStream), m_options(), m_own_stream(false) {}
+  NativeFile() : m_descriptor(kInvalidDescriptor), m_stream(kInvalidStream) {}
 
   NativeFile(FILE *fh, bool transfer_ownership)
       : m_descriptor(kInvalidDescriptor), m_own_descriptor(false), m_stream(fh),
@@ -422,10 +417,10 @@ class NativeFile : public File {
 
   // Member variables
   int m_descriptor;
-  bool m_own_descriptor;
+  bool m_own_descriptor = false;
   FILE *m_stream;
-  OpenOptions m_options;
-  bool m_own_stream;
+  OpenOptions m_options{};
+  bool m_own_stream = false;
   std::mutex offset_access_mutex;
 
 private:
diff --git a/lldb/include/lldb/Host/FileAction.h b/lldb/include/lldb/Host/FileAction.h
index 4d333bb327a54..d3166c16a5854 100644
--- a/lldb/include/lldb/Host/FileAction.h
+++ b/lldb/include/lldb/Host/FileAction.h
@@ -46,9 +46,9 @@ class FileAction {
   void Dump(Stream &stream) const;
 
 protected:
-  Action m_action; // The action for this file
-  int m_fd;        // An existing file descriptor
-  int m_arg; // oflag for eFileActionOpen*, dup_fd for eFileActionDuplicate
+  Action m_action = eFileActionNone; // The action for this file
+  int m_fd = -1;                     // An existing file descriptor
+  int m_arg = -1; // oflag for eFileActionOpen*, dup_fd for eFileActionDuplicate
   FileSpec
       m_file_spec; // A file spec to use for opening after fork or posix_spawn
 };
diff --git a/lldb/include/lldb/Host/FileSystem.h b/lldb/include/lldb/Host/FileSystem.h
index 02eba47772a47..93563d4d26e3f 100644
--- a/lldb/include/lldb/Host/FileSystem.h
+++ b/lldb/include/lldb/Host/FileSystem.h
@@ -33,7 +33,7 @@ class FileSystem {
 
   FileSystem()
       : m_fs(llvm::vfs::getRealFileSystem()), m_collector(nullptr),
-        m_home_directory(), m_mapped(false) {}
+        m_home_directory() {}
   FileSystem(std::shared_ptr<llvm::FileCollectorBase> collector)
       : m_fs(llvm::vfs::getRealFileSystem()), m_collector(std::move(collector)),
         m_home_directory(), m_mapped(false) {}
@@ -201,7 +201,7 @@ class FileSystem {
   llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> m_fs;
   std::shared_ptr<llvm::FileCollectorBase> m_collector;
   std::string m_home_directory;
-  bool m_mapped;
+  bool m_mapped = false;
 };
 } // namespace lldb_private
 
diff --git a/lldb/include/lldb/Host/HostNativeThreadBase.h b/lldb/include/lldb/Host/HostNativeThreadBase.h
index 0dfd363cc8fb7..c6007300344be 100644
--- a/lldb/include/lldb/Host/HostNativeThreadBase.h
+++ b/lldb/include/lldb/Host/HostNativeThreadBase.h
@@ -46,7 +46,7 @@ class HostNativeThreadBase {
   ThreadCreateTrampoline(lldb::thread_arg_t arg);
 
   lldb::thread_t m_thread;
-  lldb::thread_result_t m_result;
+  lldb::thread_result_t m_result = 0;
 };
 }
 
diff --git a/lldb/include/lldb/Host/ProcessLaunchInfo.h b/lldb/include/lldb/Host/ProcessLaunchInfo.h
index 883133776214d..3ed21637de7fc 100644
--- a/lldb/include/lldb/Host/ProcessLaunchInfo.h
+++ b/lldb/include/lldb/Host/ProcessLaunchInfo.h
@@ -176,10 +176,10 @@ class ProcessLaunchInfo : public ProcessInfo {
   Flags m_flags; // Bitwise OR of bits from lldb::LaunchFlags
   std::vector<FileAction> m_file_actions; // File actions for any other files
   std::shared_ptr<PseudoTerminal> m_pty;
-  uint32_t m_resume_count; // How many times do we resume after launching
+  uint32_t m_resume_count = 0; // How many times do we resume after launching
   Host::MonitorChildProcessCallback m_monitor_callback;
-  void *m_monitor_callback_baton;
-  bool m_monitor_signals;
+  void *m_monitor_callback_baton = nullptr;
+  bool m_monitor_signals = false;
   std::string m_event_data; // A string passed to the plugin launch, having no
                             // meaning to the upper levels of lldb.
   lldb::ListenerSP m_listener_sp;
diff --git a/lldb/include/lldb/Host/ProcessRunLock.h b/lldb/include/lldb/Host/ProcessRunLock.h
index 56c8d91518908..fc3cbab3b1120 100644
--- a/lldb/include/lldb/Host/ProcessRunLock.h
+++ b/lldb/include/lldb/Host/ProcessRunLock.h
@@ -35,7 +35,7 @@ class ProcessRunLock {
 
   class ProcessRunLocker {
   public:
-    ProcessRunLocker() : m_lock(nullptr) {}
+    ProcessRunLocker() {}
 
     ~ProcessRunLocker() { Unlock(); }
 
@@ -64,7 +64,7 @@ class ProcessRunLock {
       }
     }
 
-    ProcessRunLock *m_lock;
+    ProcessRunLock *m_lock = nullptr;
 
   private:
     ProcessRunLocker(const ProcessRunLocker &) = delete;
@@ -73,7 +73,7 @@ class ProcessRunLock {
 
 protected:
   lldb::rwlock_t m_rwlock;
-  bool m_running;
+  bool m_running = false;
 
 private:
   ProcessRunLock(const ProcessRunLock &) = delete;
diff --git a/lldb/include/lldb/Host/PseudoTerminal.h b/lldb/include/lldb/Host/PseudoTerminal.h
index 350f926dcac1e..bd1e2f56241b2 100644
--- a/lldb/include/lldb/Host/PseudoTerminal.h
+++ b/lldb/include/lldb/Host/PseudoTerminal.h
@@ -175,8 +175,8 @@ class PseudoTerminal {
 
 protected:
   // Member variables
-  int m_primary_fd;   ///< The file descriptor for the primary.
-  int m_secondary_fd; ///< The file descriptor for the secondary.
+  int m_primary_fd = invalid_fd;   ///< The file descriptor for the primary.
+  int m_secondary_fd = invalid_fd; ///< The file descriptor for the secondary.
 
 private:
   PseudoTerminal(const PseudoTerminal &) = delete;
diff --git a/lldb/include/lldb/Host/Terminal.h b/lldb/include/lldb/Host/Terminal.h
index 61993223ea066..172b27787b7df 100644
--- a/lldb/include/lldb/Host/Terminal.h
+++ b/lldb/include/lldb/Host/Terminal.h
@@ -116,12 +116,12 @@ class TerminalState {
 
   // Member variables
   Terminal m_tty; ///< A terminal
-  int m_tflags;   ///< Cached tflags information.
+  int m_tflags = -1; ///< Cached tflags information.
 #if LLDB_ENABLE_TERMIOS
   std::unique_ptr<struct termios>
       m_termios_up; ///< Cached terminal state information.
 #endif
-  lldb::pid_t m_process_group; ///< Cached process group information.
+  lldb::pid_t m_process_group = -1; ///< Cached process group information.
 };
 
 /// \class TerminalStateSwitcher Terminal.h "lldb/Host/Terminal.h"
@@ -171,7 +171,8 @@ class TerminalStateSwitcher {
 
 protected:
   // Member variables
-  mutable uint32_t m_currentState; ///< The currently active TTY state index.
+  mutable uint32_t m_currentState =
+      UINT32_MAX; ///< The currently active TTY state index.
   TerminalState
       m_ttystates[2]; ///< The array of TTY states that holds saved TTY info.
 };
diff --git a/lldb/include/lldb/Host/XML.h b/lldb/include/lldb/Host/XML.h
index a80f1e9e4d269..9edf46bf09df5 100644
--- a/lldb/include/lldb/Host/XML.h
+++ b/lldb/include/lldb/Host/XML.h
@@ -107,7 +107,7 @@ class XMLNode {
   void ForEachAttribute(AttributeCallback const &callback) const;
 
 protected:
-  XMLNodeImpl m_node;
+  XMLNodeImpl m_node = nullptr;
 };
 
 class XMLDocument {
@@ -138,7 +138,7 @@ class XMLDocument {
   static bool XMLEnabled();
 
 protected:
-  XMLDocumentImpl m_document;
+  XMLDocumentImpl m_document = nullptr;
   StreamString m_errors;
 };
 
diff --git a/lldb/include/lldb/Host/posix/ConnectionFileDescriptorPosix.h b/lldb/include/lldb/Host/posix/ConnectionFileDescriptorPosix.h
index 3ee8f9d9133e3..42be989dfa7b6 100644
--- a/lldb/include/lldb/Host/posix/ConnectionFileDescriptorPosix.h
+++ b/lldb/include/lldb/Host/posix/ConnectionFileDescriptorPosix.h
@@ -108,7 +108,7 @@ class ConnectionFileDescriptor : public Connection {
   std::atomic<bool> m_shutting_down; // This marks that we are shutting down so
                                      // if we get woken up from
   // BytesAvailable to disconnect, we won't try to read again.
-  bool m_waiting_for_accept;
+  bool m_waiting_for_accept = false;
   bool m_child_processes_inherit;
 
   std::string m_uri;
diff --git a/lldb/include/lldb/Initialization/SystemLifetimeManager.h b/lldb/include/lldb/Initialization/SystemLifetimeManager.h
index 27e1a22b19dd8..06328e60133fe 100644
--- a/lldb/include/lldb/Initialization/SystemLifetimeManager.h
+++ b/lldb/include/lldb/Initialization/SystemLifetimeManager.h
@@ -30,7 +30,7 @@ class SystemLifetimeManager {
 private:
   std::recursive_mutex m_mutex;
   std::unique_ptr<SystemInitializer> m_initializer;
-  bool m_initialized;
+  bool m_initialized = false;
 
   // Noncopyable.
   SystemLifetimeManager(const SystemLifetimeManager &other) = delete;
diff --git a/lldb/include/lldb/Interpreter/CommandInterpreter.h b/lldb/include/lldb/Interpreter/CommandInterpreter.h
index 5b5f145b7e25d..a8475ca610463 100644
--- a/lldb/include/lldb/Interpreter/CommandInterpreter.h
+++ b/lldb/include/lldb/Interpreter/CommandInterpreter.h
@@ -33,8 +33,7 @@ class CommandInterpreter;
 
 class CommandInterpreterRunResult {
 public:
-  CommandInterpreterRunResult()
-      : m_num_errors(0), m_result(lldb::eCommandInterpreterResultSuccess) {}
+  CommandInterpreterRunResult() {}
 
   uint32_t GetNumErrors() const { return m_num_errors; }
 
@@ -52,8 +51,9 @@ class CommandInterpreterRunResult {
   void SetResult(lldb::CommandInterpreterResult result) { m_result = result; }
 
 private:
-  int m_num_errors;
-  lldb::CommandInterpreterResult m_result;
+  int m_num_errors = 0;
+  lldb::CommandInterpreterResult m_result =
+      lldb::eCommandInterpreterResultSuccess;
 };
 
 class CommandInterpreterRunOptions {
@@ -101,13 +101,8 @@ class CommandInterpreterRunOptions {
         m_print_errors(print_errors), m_add_to_history(add_to_history) {}
 
   CommandInterpreterRunOptions()
-      : m_stop_on_continue(eLazyBoolCalculate),
-        m_stop_on_error(eLazyBoolCalculate),
-        m_stop_on_crash(eLazyBoolCalculate),
-        m_echo_commands(eLazyBoolCalculate),
-        m_echo_comment_commands(eLazyBoolCalculate),
-        m_print_results(eLazyBoolCalculate), m_print_errors(eLazyBoolCalculate),
-        m_add_to_history(eLazyBoolCalculate) {}
+
+  {}
 
   void SetSilent(bool silent) {
     LazyBool value = silent ? eLazyBoolNo : eLazyBoolYes;
@@ -187,14 +182,14 @@ class CommandInterpreterRunOptions {
     m_spawn_thread = spawn_thread ? eLazyBoolYes : eLazyBoolNo;
   }
 
-  LazyBool m_stop_on_continue;
-  LazyBool m_stop_on_error;
-  LazyBool m_stop_on_crash;
-  LazyBool m_echo_commands;
-  LazyBool m_echo_comment_commands;
-  LazyBool m_print_results;
-  LazyBool m_print_errors;
-  LazyBool m_add_to_history;
+  LazyBool m_stop_on_continue = eLazyBoolCalculate;
+  LazyBool m_stop_on_error = eLazyBoolCalculate;
+  LazyBool m_stop_on_crash = eLazyBoolCalculate;
+  LazyBool m_echo_commands = eLazyBoolCalculate;
+  LazyBool m_echo_comment_commands = eLazyBoolCalculate;
+  LazyBool m_print_results = eLazyBoolCalculate;
+  LazyBool m_print_errors = eLazyBoolCalculate;
+  LazyBool m_add_to_history = eLazyBoolCalculate;
   LazyBool m_auto_handle_events;
   LazyBool m_spawn_thread;
 
diff --git a/lldb/include/lldb/Interpreter/OptionValue.h b/lldb/include/lldb/Interpreter/OptionValue.h
index 218fa6f029c13..d31c2048aada0 100644
--- a/lldb/include/lldb/Interpreter/OptionValue.h
+++ b/lldb/include/lldb/Interpreter/OptionValue.h
@@ -60,7 +60,7 @@ class OptionValue {
     eDumpGroupExport = (eDumpOptionCommand | eDumpOptionName | eDumpOptionValue)
   };
 
-  OptionValue() : m_value_was_set(false) {}
+  OptionValue() {}
 
   virtual ~OptionValue() = default;
 
@@ -329,12 +329,12 @@ class OptionValue {
 
   lldb::OptionValueWP m_parent_wp;
   std::function<void()> m_callback;
-  bool m_value_was_set; // This can be used to see if a value has been set
-                        // by a call to SetValueFromCString(). It is often
-                        // handy to know if an option value was set from the
-                        // command line or as a setting, versus if we just have
-                        // the default value that was already populated in the
-                        // option value.
+  bool m_value_was_set = false; // This can be used to see if a value has been
+                                // set by a call to SetValueFromCString(). It is
+                                // often handy to know if an option value was
+                                // set from the command line or as a setting,
+                                // versus if we just have the default value that
+                                // was already populated in the option value.
 };
 
 } // namespace lldb_private
diff --git a/lldb/include/lldb/Interpreter/OptionValueFileColonLine.h b/lldb/include/lldb/Interpreter/OptionValueFileColonLine.h
index 80a38fc9ed7ed..83d36edc1e9a0 100644
--- a/lldb/include/lldb/Interpreter/OptionValueFileColonLine.h
+++ b/lldb/include/lldb/Interpreter/OptionValueFileColonLine.h
@@ -9,8 +9,8 @@
 #ifndef LLDB_INTERPRETER_OPTIONVALUEFILECOLONLINE_H
 #define LLDB_INTERPRETER_OPTIONVALUEFILECOLONLINE_H
 
+#include "lldb/Interpreter/CommandCompletions.h"
 #include "lldb/Interpreter/OptionValue.h"
-
 #include "lldb/Utility/FileSpec.h"
 #include "llvm/Support/Chrono.h"
 
@@ -50,9 +50,9 @@ class OptionValueFileColonLine :
 
 protected:
   FileSpec m_file_spec;
-  uint32_t m_line_number;
-  uint32_t m_column_number;
-  uint32_t m_completion_mask;
+  uint32_t m_line_number = LLDB_INVALID_LINE_NUMBER;
+  uint32_t m_column_number = LLDB_INVALID_COLUMN_NUMBER;
+  uint32_t m_completion_mask = CommandCompletions::eSourceFileCompletion;
 };
 
 } // namespace lldb_private
diff --git a/lldb/include/lldb/Interpreter/OptionValueFileSpec.h b/lldb/include/lldb/Interpreter/OptionValueFileSpec.h
index dbaeac6c60c12..6648bbac93e33 100644
--- a/lldb/include/lldb/Interpreter/OptionValueFileSpec.h
+++ b/lldb/include/lldb/Interpreter/OptionValueFileSpec.h
@@ -9,6 +9,7 @@
 #ifndef LLDB_INTERPRETER_OPTIONVALUEFILESPEC_H
 #define LLDB_INTERPRETER_OPTIONVALUEFILESPEC_H
 
+#include "lldb/Interpreter/CommandCompletions.h"
 #include "lldb/Interpreter/OptionValue.h"
 
 #include "lldb/Utility/FileSpec.h"
@@ -74,7 +75,7 @@ class OptionValueFileSpec : public Cloneable<OptionValueFileSpec, OptionValue> {
   FileSpec m_default_value;
   lldb::DataBufferSP m_data_sp;
   llvm::sys::TimePoint<> m_data_mod_time;
-  uint32_t m_completion_mask;
+  uint32_t m_completion_mask = CommandCompletions::eDiskFileCompletion;
   bool m_resolve;
 };
 
diff --git a/lldb/include/lldb/Interpreter/Options.h b/lldb/include/lldb/Interpreter/Options.h
index 0d86fac14dcc4..9b85ca04bbfe2 100644
--- a/lldb/include/lldb/Interpreter/Options.h
+++ b/lldb/include/lldb/Interpreter/Options.h
@@ -254,7 +254,7 @@ class OptionGroup {
 
 class OptionGroupOptions : public Options {
 public:
-  OptionGroupOptions() : m_did_finalize(false) {}
+  OptionGroupOptions() {}
 
   ~OptionGroupOptions() override = default;
 
@@ -317,7 +317,7 @@ class OptionGroupOptions : public Options {
 
   std::vector<OptionDefinition> m_option_defs;
   OptionInfos m_option_infos;
-  bool m_did_finalize;
+  bool m_did_finalize = false;
 };
 
 } // namespace lldb_private
diff --git a/lldb/include/lldb/Interpreter/ScriptInterpreter.h b/lldb/include/lldb/Interpreter/ScriptInterpreter.h
index fa713e66d000c..00883c8d3d510 100644
--- a/lldb/include/lldb/Interpreter/ScriptInterpreter.h
+++ b/lldb/include/lldb/Interpreter/ScriptInterpreter.h
@@ -94,8 +94,7 @@ class ScriptInterpreter : public PluginInterface {
 
   struct ExecuteScriptOptions {
   public:
-    ExecuteScriptOptions()
-        : m_enable_io(true), m_set_lldb_globals(true), m_maskout_errors(true) {}
+    ExecuteScriptOptions() {}
 
     bool GetEnableIO() const { return m_enable_io; }
 
@@ -122,9 +121,9 @@ class ScriptInterpreter : public PluginInterface {
     }
 
   private:
-    bool m_enable_io;
-    bool m_set_lldb_globals;
-    bool m_maskout_errors;
+    bool m_enable_io = true;
+    bool m_set_lldb_globals = true;
+    bool m_maskout_errors = true;
   };
 
   virtual bool Interrupt() { return false; }
diff --git a/lldb/include/lldb/Symbol/CompactUnwindInfo.h b/lldb/include/lldb/Symbol/CompactUnwindInfo.h
index e622c5fde2290..a3b477e55efc7 100644
--- a/lldb/include/lldb/Symbol/CompactUnwindInfo.h
+++ b/lldb/include/lldb/Symbol/CompactUnwindInfo.h
@@ -50,21 +50,20 @@ class CompactUnwindInfo {
   // There are relatively few of these (one per 500/1000 functions, depending
   // on format) so creating them on first scan will not be too costly.
   struct UnwindIndex {
-    uint32_t function_offset; // The offset of the first function covered by
-                              // this index
-    uint32_t second_level; // The offset (inside unwind_info sect) to the second
-                           // level page for this index
+    uint32_t function_offset = 0; // The offset of the first function covered by
+                                  // this index
+    uint32_t second_level = 0;    // The offset (inside unwind_info sect) to the
+                                  // second level page for this index
     // (either UNWIND_SECOND_LEVEL_REGULAR or UNWIND_SECOND_LEVEL_COMPRESSED)
-    uint32_t lsda_array_start; // The offset (inside unwind_info sect) LSDA
-                               // array for this index
-    uint32_t lsda_array_end; // The offset to the LSDA array for the NEXT index
-    bool sentinal_entry; // There is an empty index at the end which provides
-                         // the upper bound of
+    uint32_t lsda_array_start = 0; // The offset (inside unwind_info sect) LSDA
+                                   // array for this index
+    uint32_t lsda_array_end =
+        0; // The offset to the LSDA array for the NEXT index
+    bool sentinal_entry = false; // There is an empty index at the end which
+                                 // provides the upper bound of
     // function addresses that are described
 
-    UnwindIndex()
-        : function_offset(0), second_level(0), lsda_array_start(0),
-          lsda_array_end(0), sentinal_entry(false) {}
+    UnwindIndex() {}
 
     bool operator<(const CompactUnwindInfo::UnwindIndex &rhs) const {
       return function_offset < rhs.function_offset;
@@ -78,30 +77,26 @@ class CompactUnwindInfo {
   // An internal object used to store the information we retrieve about a
   // function -- the encoding bits and possibly the LSDA/personality function.
   struct FunctionInfo {
-    uint32_t encoding;    // compact encoding 32-bit value for this function
+    uint32_t encoding = 0; // compact encoding 32-bit value for this function
     Address lsda_address; // the address of the LSDA data for this function
     Address personality_ptr_address; // the address where the personality
                                      // routine addr can be found
 
-    uint32_t valid_range_offset_start; // first offset that this encoding is
-                                       // valid for (start of the function)
-    uint32_t
-        valid_range_offset_end; // the offset of the start of the next function
-    FunctionInfo()
-        : encoding(0), lsda_address(), personality_ptr_address(),
-          valid_range_offset_start(0), valid_range_offset_end(0) {}
+    uint32_t valid_range_offset_start = 0; // first offset that this encoding is
+                                           // valid for (start of the function)
+    uint32_t valid_range_offset_end =
+        0; // the offset of the start of the next function
+    FunctionInfo() : lsda_address(), personality_ptr_address() {}
   };
 
   struct UnwindHeader {
     uint32_t version;
-    uint32_t common_encodings_array_offset;
-    uint32_t common_encodings_array_count;
-    uint32_t personality_array_offset;
-    uint32_t personality_array_count;
-
-    UnwindHeader()
-        : common_encodings_array_offset(0), common_encodings_array_count(0),
-          personality_array_offset(0), personality_array_count(0) {}
+    uint32_t common_encodings_array_offset = 0;
+    uint32_t common_encodings_array_count = 0;
+    uint32_t personality_array_offset = 0;
+    uint32_t personality_array_count = 0;
+
+    UnwindHeader() {}
   };
 
   void ScanIndex(const lldb::ProcessSP &process_sp);
diff --git a/lldb/include/lldb/Symbol/LineEntry.h b/lldb/include/lldb/Symbol/LineEntry.h
index 7e56ef814765b..698d89974dc63 100644
--- a/lldb/include/lldb/Symbol/LineEntry.h
+++ b/lldb/include/lldb/Symbol/LineEntry.h
@@ -140,10 +140,12 @@ struct LineEntry {
   FileSpec file; ///< The source file, possibly mapped by the target.source-map
                  ///setting
   FileSpec original_file; ///< The original source file, from debug info.
-  uint32_t line; ///< The source line number, or zero if there is no line number
-                 ///information.
-  uint16_t column; ///< The column number of the source line, or zero if there
-                   ///is no column information.
+  uint32_t line = LLDB_INVALID_LINE_NUMBER; ///< The source line number, or zero
+                                            ///< if there is no line number
+                                            /// information.
+  uint16_t column =
+      0; ///< The column number of the source line, or zero if there
+         /// is no column information.
   uint16_t is_start_of_statement : 1, ///< Indicates this entry is the beginning
                                       ///of a statement.
       is_start_of_basic_block : 1, ///< Indicates this entry is the beginning of
diff --git a/lldb/include/lldb/Symbol/LineTable.h b/lldb/include/lldb/Symbol/LineTable.h
index 68b5406409874..5cd22bd831eef 100644
--- a/lldb/include/lldb/Symbol/LineTable.h
+++ b/lldb/include/lldb/Symbol/LineTable.h
@@ -209,10 +209,9 @@ class LineTable {
 protected:
   struct Entry {
     Entry()
-        : file_addr(LLDB_INVALID_ADDRESS), line(0),
-          is_start_of_statement(false), is_start_of_basic_block(false),
+        : line(0), is_start_of_statement(false), is_start_of_basic_block(false),
           is_prologue_end(false), is_epilogue_begin(false),
-          is_terminal_entry(false), column(0), file_idx(0) {}
+          is_terminal_entry(false) {}
 
     Entry(lldb::addr_t _file_addr, uint32_t _line, uint16_t _column,
           uint16_t _file_idx, bool _is_start_of_statement,
@@ -279,7 +278,7 @@ class LineTable {
 
     // Member variables.
     /// The file address for this line entry.
-    lldb::addr_t file_addr;
+    lldb::addr_t file_addr = LLDB_INVALID_ADDRESS;
     /// The source line number, or zero if there is no line number
     /// information.
     uint32_t line : 27;
@@ -298,10 +297,10 @@ class LineTable {
     uint32_t is_terminal_entry : 1;
     /// The column number of the source line, or zero if there is no
     /// column information.
-    uint16_t column;
+    uint16_t column = 0;
     /// The file index into CompileUnit's file table, or zero if there
     /// is no file information.
-    uint16_t file_idx;
+    uint16_t file_idx = 0;
   };
 
   struct EntrySearchInfo {
diff --git a/lldb/include/lldb/Symbol/Symbol.h b/lldb/include/lldb/Symbol/Symbol.h
index 3a235f260ba5b..3abe3114863de 100644
--- a/lldb/include/lldb/Symbol/Symbol.h
+++ b/lldb/include/lldb/Symbol/Symbol.h
@@ -233,8 +233,9 @@ class Symbol : public SymbolContextScope {
       lldb_private::ModuleSpec &module_spec,
       lldb_private::ModuleList &seen_modules) const;
 
-  uint32_t m_uid;       // User ID (usually the original symbol table index)
-  uint16_t m_type_data; // data specific to m_type
+  uint32_t m_uid =
+      UINT32_MAX;           // User ID (usually the original symbol table index)
+  uint16_t m_type_data = 0; // data specific to m_type
   uint16_t m_type_data_resolved : 1, // True if the data in m_type_data has
                                      // already been calculated
       m_is_synthetic : 1, // non-zero if this symbol is not actually in the
@@ -261,8 +262,8 @@ class Symbol : public SymbolContextScope {
   AddressRange m_addr_range; // Contains the value, or the section offset
                              // address when the value is an address in a
                              // section, and the size (if any)
-  uint32_t m_flags; // A copy of the flags from the original symbol table, the
-                    // ObjectFile plug-in can interpret these
+  uint32_t m_flags = 0; // A copy of the flags from the original symbol table,
+                        // the ObjectFile plug-in can interpret these
 };
 
 } // namespace lldb_private
diff --git a/lldb/include/lldb/Symbol/SymbolContext.h b/lldb/include/lldb/Symbol/SymbolContext.h
index 1cf26a6959b7f..cac951bc19b92 100644
--- a/lldb/include/lldb/Symbol/SymbolContext.h
+++ b/lldb/include/lldb/Symbol/SymbolContext.h
@@ -316,12 +316,13 @@ class SymbolContext {
   // Member variables
   lldb::TargetSP target_sp; ///< The Target for a given query
   lldb::ModuleSP module_sp; ///< The Module for a given query
-  CompileUnit *comp_unit;   ///< The CompileUnit for a given query
-  Function *function;       ///< The Function for a given query
-  Block *block;             ///< The Block for a given query
+  CompileUnit *comp_unit = nullptr; ///< The CompileUnit for a given query
+  Function *function = nullptr;     ///< The Function for a given query
+  Block *block = nullptr;           ///< The Block for a given query
   LineEntry line_entry;     ///< The LineEntry for a given query
-  Symbol *symbol;           ///< The Symbol for a given query
-  Variable *variable;       ///< The global variable matching the given query
+  Symbol *symbol = nullptr; ///< The Symbol for a given query
+  Variable *variable =
+      nullptr; ///< The global variable matching the given query
 };
 
 class SymbolContextSpecifier {
diff --git a/lldb/include/lldb/Symbol/Type.h b/lldb/include/lldb/Symbol/Type.h
index 6614950c2437a..80f3ec547d845 100644
--- a/lldb/include/lldb/Symbol/Type.h
+++ b/lldb/include/lldb/Symbol/Type.h
@@ -213,17 +213,17 @@ class Type : public std::enable_shared_from_this<Type>, public UserID {
 
 protected:
   ConstString m_name;
-  SymbolFile *m_symbol_file;
+  SymbolFile *m_symbol_file = nullptr;
   /// The symbol context in which this type is defined.
-  SymbolContextScope *m_context;
-  Type *m_encoding_type;
-  lldb::user_id_t m_encoding_uid;
-  EncodingDataType m_encoding_uid_type;
+  SymbolContextScope *m_context = nullptr;
+  Type *m_encoding_type = nullptr;
+  lldb::user_id_t m_encoding_uid = LLDB_INVALID_UID;
+  EncodingDataType m_encoding_uid_type = eEncodingInvalid;
   uint64_t m_byte_size : 63;
   uint64_t m_byte_size_has_value : 1;
   Declaration m_decl;
   CompilerType m_compiler_type;
-  ResolveState m_compiler_type_resolve_state;
+  ResolveState m_compiler_type_resolve_state = ResolveState::Unresolved;
   /// Language-specific flags.
   Payload m_payload;
 
@@ -340,8 +340,7 @@ class TypeListImpl {
 class TypeMemberImpl {
 public:
   TypeMemberImpl()
-      : m_type_impl_sp(), m_bit_offset(0), m_name(), m_bitfield_bit_size(0),
-        m_is_bitfield(false)
+      : m_type_impl_sp(), m_name()
 
   {}
 
@@ -376,10 +375,10 @@ class TypeMemberImpl {
 
 protected:
   lldb::TypeImplSP m_type_impl_sp;
-  uint64_t m_bit_offset;
+  uint64_t m_bit_offset = 0;
   ConstString m_name;
-  uint32_t m_bitfield_bit_size; // Bit size for bitfield members only
-  bool m_is_bitfield;
+  uint32_t m_bitfield_bit_size = 0; // Bit size for bitfield members only
+  bool m_is_bitfield = false;
 };
 
 ///
@@ -435,9 +434,7 @@ class TypeAndOrName {
 
 class TypeMemberFunctionImpl {
 public:
-  TypeMemberFunctionImpl()
-      : m_type(), m_decl(), m_name(), m_kind(lldb::eMemberFunctionKindUnknown) {
-  }
+  TypeMemberFunctionImpl() : m_type(), m_decl(), m_name() {}
 
   TypeMemberFunctionImpl(const CompilerType &type, const CompilerDecl &decl,
                          const std::string &name,
@@ -469,13 +466,12 @@ class TypeMemberFunctionImpl {
   CompilerType m_type;
   CompilerDecl m_decl;
   ConstString m_name;
-  lldb::MemberFunctionKind m_kind;
+  lldb::MemberFunctionKind m_kind = lldb::eMemberFunctionKindUnknown;
 };
 
 class TypeEnumMemberImpl {
 public:
-  TypeEnumMemberImpl()
-      : m_integer_type_sp(), m_name("<invalid>"), m_value(), m_valid(false) {}
+  TypeEnumMemberImpl() : m_integer_type_sp(), m_name("<invalid>"), m_value() {}
 
   TypeEnumMemberImpl(const lldb::TypeImplSP &integer_type_sp,
                      ConstString name, const llvm::APSInt &value);
@@ -498,7 +494,7 @@ class TypeEnumMemberImpl {
   lldb::TypeImplSP m_integer_type_sp;
   ConstString m_name;
   llvm::APSInt m_value;
-  bool m_valid;
+  bool m_valid = false;
 };
 
 class TypeEnumMemberListImpl {
diff --git a/lldb/include/lldb/Symbol/TypeSystem.h b/lldb/include/lldb/Symbol/TypeSystem.h
index 1fad8f61ac370..a37c1040b16e7 100644
--- a/lldb/include/lldb/Symbol/TypeSystem.h
+++ b/lldb/include/lldb/Symbol/TypeSystem.h
@@ -524,7 +524,7 @@ class TypeSystemMap {
   mutable std::mutex m_mutex; ///< A mutex to keep this object happy in
                               ///multi-threaded environments.
   collection m_map;
-  bool m_clear_in_progress;
+  bool m_clear_in_progress = false;
 
 private:
   typedef llvm::function_ref<lldb::TypeSystemSP()> CreateCallback;
diff --git a/lldb/include/lldb/Symbol/UnwindPlan.h b/lldb/include/lldb/Symbol/UnwindPlan.h
index f8d23d7b7f231..cc2302d25831b 100644
--- a/lldb/include/lldb/Symbol/UnwindPlan.h
+++ b/lldb/include/lldb/Symbol/UnwindPlan.h
@@ -71,7 +71,7 @@ class UnwindPlan {
         isDWARFExpression  // reg = eval(dwarf_expr)
       };
 
-      RegisterLocation() : m_type(unspecified), m_location() {}
+      RegisterLocation() : m_location() {}
 
       bool operator==(const RegisterLocation &rhs) const;
 
@@ -181,7 +181,7 @@ class UnwindPlan {
                 const UnwindPlan::Row *row, Thread *thread, bool verbose) const;
 
     private:
-      RestoreType m_type; // How do we locate this register?
+      RestoreType m_type = unspecified; // How do we locate this register?
       union {
         // For m_type == atCFAPlusOffset or m_type == isCFAPlusOffset
         int32_t offset;
@@ -205,7 +205,7 @@ class UnwindPlan {
         isRaSearch,             // FA = SP + offset + ???
       };
 
-      FAValue() : m_type(unspecified), m_value() {}
+      FAValue() : m_value() {}
 
       bool operator==(const FAValue &rhs) const;
 
@@ -301,7 +301,7 @@ class UnwindPlan {
       void Dump(Stream &s, const UnwindPlan *unwind_plan, Thread *thread) const;
 
     private:
-      ValueType m_type; // How do we compute CFA value?
+      ValueType m_type = unspecified; // How do we compute CFA value?
       union {
         struct {
           // For m_type == isRegisterPlusOffset or m_type ==
@@ -384,12 +384,12 @@ class UnwindPlan {
 
   protected:
     typedef std::map<uint32_t, RegisterLocation> collection;
-    lldb::addr_t m_offset; // Offset into the function for this row
+    lldb::addr_t m_offset = 0; // Offset into the function for this row
 
     FAValue m_cfa_value;
     FAValue m_afa_value;
     collection m_register_locations;
-    bool m_unspecified_registers_are_undefined;
+    bool m_unspecified_registers_are_undefined = false;
   }; // class Row
 
   typedef std::shared_ptr<Row> RowSP;
diff --git a/lldb/include/lldb/Target/ExecutionContext.h b/lldb/include/lldb/Target/ExecutionContext.h
index 169d56ac9b647..d8c233a666bb4 100644
--- a/lldb/include/lldb/Target/ExecutionContext.h
+++ b/lldb/include/lldb/Target/ExecutionContext.h
@@ -263,8 +263,9 @@ class ExecutionContextRef {
   lldb::TargetWP m_target_wp;         ///< A weak reference to a target
   lldb::ProcessWP m_process_wp;       ///< A weak reference to a process
   mutable lldb::ThreadWP m_thread_wp; ///< A weak reference to a thread
-  lldb::tid_t m_tid;  ///< The thread ID that this object refers to in case the
-                      ///backing object changes
+  lldb::tid_t m_tid = LLDB_INVALID_THREAD_ID; ///< The thread ID that this
+                                              ///< object refers to in case the
+                                              /// backing object changes
   StackID m_stack_id; ///< The stack ID that this object refers to in case the
                       ///backing object changes
 };
diff --git a/lldb/include/lldb/Target/PathMappingList.h b/lldb/include/lldb/Target/PathMappingList.h
index 9e1e6eb26eb9b..bfc4da69ec0fa 100644
--- a/lldb/include/lldb/Target/PathMappingList.h
+++ b/lldb/include/lldb/Target/PathMappingList.h
@@ -118,9 +118,9 @@ class PathMappingList {
   const_iterator FindIteratorForPath(ConstString path) const;
 
   collection m_pairs;
-  ChangedCallback m_callback;
-  void *m_callback_baton;
-  uint32_t m_mod_id; // Incremented anytime anything is added or removed.
+  ChangedCallback m_callback = nullptr;
+  void *m_callback_baton = nullptr;
+  uint32_t m_mod_id = 0; // Incremented anytime anything is added or removed.
 };
 
 } // namespace lldb_private
diff --git a/lldb/include/lldb/Target/Process.h b/lldb/include/lldb/Target/Process.h
index f6a5386fe511a..b7b45184af2ab 100644
--- a/lldb/include/lldb/Target/Process.h
+++ b/lldb/include/lldb/Target/Process.h
@@ -113,9 +113,7 @@ class ProcessAttachInfo : public ProcessInstanceInfo {
 public:
   ProcessAttachInfo()
       : ProcessInstanceInfo(), m_listener_sp(), m_hijack_listener_sp(),
-        m_plugin_name(), m_resume_count(0), m_wait_for_launch(false),
-        m_ignore_existing(true), m_continue_once_attached(false),
-        m_detach_on_error(true), m_async(false) {}
+        m_plugin_name() {}
 
   ProcessAttachInfo(const ProcessLaunchInfo &launch_info)
       : ProcessInstanceInfo(), m_listener_sp(), m_hijack_listener_sp(),
@@ -200,17 +198,19 @@ class ProcessAttachInfo : public ProcessInstanceInfo {
   lldb::ListenerSP m_listener_sp;
   lldb::ListenerSP m_hijack_listener_sp;
   std::string m_plugin_name;
-  uint32_t m_resume_count; // How many times do we resume after launching
-  bool m_wait_for_launch;
-  bool m_ignore_existing;
-  bool m_continue_once_attached; // Supports the use-case scenario of
-                                 // immediately continuing the process once
-                                 // attached.
-  bool m_detach_on_error; // If we are debugging remotely, instruct the stub to
-                          // detach rather than killing the target on error.
-  bool m_async; // Use an async attach where we start the attach and return
-                // immediately (used by GUI programs with --waitfor so they can
-                // call SBProcess::Stop() to cancel attach)
+  uint32_t m_resume_count = 0; // How many times do we resume after launching
+  bool m_wait_for_launch = false;
+  bool m_ignore_existing = true;
+  bool m_continue_once_attached = false; // Supports the use-case scenario of
+                                         // immediately continuing the process
+                                         // once attached.
+  bool m_detach_on_error =
+      true; // If we are debugging remotely, instruct the stub to
+            // detach rather than killing the target on error.
+  bool m_async =
+      false; // Use an async attach where we start the attach and return
+             // immediately (used by GUI programs with --waitfor so they can
+             // call SBProcess::Stop() to cancel attach)
 };
 
 // This class tracks the Modification state of the process.  Things that can
@@ -223,9 +223,8 @@ class ProcessModID {
 
 public:
   ProcessModID()
-      : m_stop_id(0), m_last_natural_stop_id(0), m_resume_id(0), m_memory_id(0),
-        m_last_user_expression_resume(0), m_running_user_expression(false),
-        m_running_utility_function(0) {}
+
+  {}
 
   ProcessModID(const ProcessModID &rhs)
       : m_stop_id(rhs.m_stop_id), m_memory_id(rhs.m_memory_id) {}
@@ -316,13 +315,13 @@ class ProcessModID {
   }
 
 private:
-  uint32_t m_stop_id;
-  uint32_t m_last_natural_stop_id;
-  uint32_t m_resume_id;
-  uint32_t m_memory_id;
-  uint32_t m_last_user_expression_resume;
-  uint32_t m_running_user_expression;
-  uint32_t m_running_utility_function;
+  uint32_t m_stop_id = 0;
+  uint32_t m_last_natural_stop_id = 0;
+  uint32_t m_resume_id = 0;
+  uint32_t m_memory_id = 0;
+  uint32_t m_last_user_expression_resume = 0;
+  uint32_t m_running_user_expression = false;
+  uint32_t m_running_utility_function = 0;
   lldb::EventSP m_last_natural_stop_event;
 };
 
@@ -471,12 +470,12 @@ class Process : public std::enable_shared_from_this<Process>,
     }
 
     lldb::ProcessWP m_process_wp;
-    lldb::StateType m_state;
+    lldb::StateType m_state = lldb::eStateInvalid;
     std::vector<std::string> m_restarted_reasons;
-    bool m_restarted; // For "eStateStopped" events, this is true if the target
-                      // was automatically restarted.
-    int m_update_state;
-    bool m_interrupted;
+    bool m_restarted = false; // For "eStateStopped" events, this is true if the
+                              // target was automatically restarted.
+    int m_update_state = 0;
+    bool m_interrupted = false;
 
     ProcessEventData(const ProcessEventData &) = delete;
     const ProcessEventData &operator=(const ProcessEventData &) = delete;
diff --git a/lldb/include/lldb/Target/RegisterNumber.h b/lldb/include/lldb/Target/RegisterNumber.h
index 362812bcffd06..90f9531989690 100644
--- a/lldb/include/lldb/Target/RegisterNumber.h
+++ b/lldb/include/lldb/Target/RegisterNumber.h
@@ -50,10 +50,10 @@ class RegisterNumber {
   typedef std::map<lldb::RegisterKind, uint32_t> Collection;
 
   lldb::RegisterContextSP m_reg_ctx_sp;
-  uint32_t m_regnum;
-  lldb::RegisterKind m_kind;
+  uint32_t m_regnum = LLDB_INVALID_REGNUM;
+  lldb::RegisterKind m_kind = lldb::kNumRegisterKinds;
   Collection m_kind_regnum_map;
-  const char *m_name;
+  const char *m_name = nullptr;
 };
 
 #endif // LLDB_TARGET_REGISTERNUMBER_H
diff --git a/lldb/include/lldb/Target/StackID.h b/lldb/include/lldb/Target/StackID.h
index 827ed1be7c0f1..95d12df6742c5 100644
--- a/lldb/include/lldb/Target/StackID.h
+++ b/lldb/include/lldb/Target/StackID.h
@@ -18,8 +18,8 @@ class StackID {
 public:
   // Constructors and Destructors
   StackID()
-      : m_pc(LLDB_INVALID_ADDRESS), m_cfa(LLDB_INVALID_ADDRESS),
-        m_symbol_scope(nullptr) {}
+
+  {}
 
   explicit StackID(lldb::addr_t pc, lldb::addr_t cfa,
                    SymbolContextScope *symbol_scope)
@@ -69,23 +69,25 @@ class StackID {
 
   void SetCFA(lldb::addr_t cfa) { m_cfa = cfa; }
 
-  lldb::addr_t
-      m_pc; // The pc value for the function/symbol for this frame. This will
+  lldb::addr_t m_pc =
+      LLDB_INVALID_ADDRESS; // The pc value for the function/symbol for this
+                            // frame. This will
   // only get used if the symbol scope is nullptr (the code where we are
   // stopped is not represented by any function or symbol in any shared
   // library).
-  lldb::addr_t m_cfa; // The call frame address (stack pointer) value
-                      // at the beginning of the function that uniquely
-                      // identifies this frame (along with m_symbol_scope
-                      // below)
-  SymbolContextScope *
-      m_symbol_scope; // If nullptr, there is no block or symbol for this frame.
-                      // If not nullptr, this will either be the scope for the
-                      // lexical block for the frame, or the scope for the
-                      // symbol. Symbol context scopes are always be unique
-                      // pointers since the are part of the Block and Symbol
-                      // objects and can easily be used to tell if a stack ID
-                      // is the same as another.
+  lldb::addr_t m_cfa =
+      LLDB_INVALID_ADDRESS; // The call frame address (stack pointer) value
+                            // at the beginning of the function that uniquely
+                            // identifies this frame (along with m_symbol_scope
+                            // below)
+  SymbolContextScope *m_symbol_scope =
+      nullptr; // If nullptr, there is no block or symbol for this frame.
+               // If not nullptr, this will either be the scope for the
+               // lexical block for the frame, or the scope for the
+               // symbol. Symbol context scopes are always be unique
+               // pointers since the are part of the Block and Symbol
+               // objects and can easily be used to tell if a stack ID
+               // is the same as another.
 };
 
 bool operator==(const StackID &lhs, const StackID &rhs);
diff --git a/lldb/include/lldb/Target/ThreadSpec.h b/lldb/include/lldb/Target/ThreadSpec.h
index 8c22d53185ffb..7c7c832741196 100644
--- a/lldb/include/lldb/Target/ThreadSpec.h
+++ b/lldb/include/lldb/Target/ThreadSpec.h
@@ -120,8 +120,8 @@ class ThreadSpec {
     return g_option_names[(size_t) enum_value];
   }
 
-  uint32_t m_index;
-  lldb::tid_t m_tid;
+  uint32_t m_index = UINT32_MAX;
+  lldb::tid_t m_tid = LLDB_INVALID_THREAD_ID;
   std::string m_name;
   std::string m_queue_name;
 };
diff --git a/lldb/include/lldb/Target/UnwindLLDB.h b/lldb/include/lldb/Target/UnwindLLDB.h
index c7c9cfbccbad8..f6750171c54a6 100644
--- a/lldb/include/lldb/Target/UnwindLLDB.h
+++ b/lldb/include/lldb/Target/UnwindLLDB.h
@@ -109,17 +109,17 @@ class UnwindLLDB : public lldb_private::Unwind {
 
 private:
   struct Cursor {
-    lldb::addr_t start_pc; // The start address of the function/symbol for this
-                           // frame - current pc if unknown
-    lldb::addr_t cfa;      // The canonical frame address for this stack frame
+    lldb::addr_t start_pc =
+        LLDB_INVALID_ADDRESS; // The start address of the function/symbol for
+                              // this frame - current pc if unknown
+    lldb::addr_t cfa = LLDB_INVALID_ADDRESS; // The canonical frame address for
+                                             // this stack frame
     lldb_private::SymbolContext sctx; // A symbol context we'll contribute to &
                                       // provide to the StackFrame creation
     RegisterContextLLDBSP
         reg_ctx_lldb_sp; // These are all RegisterContextUnwind's
 
-    Cursor()
-        : start_pc(LLDB_INVALID_ADDRESS), cfa(LLDB_INVALID_ADDRESS), sctx(),
-          reg_ctx_lldb_sp() {}
+    Cursor() : sctx(), reg_ctx_lldb_sp() {}
 
   private:
     Cursor(const Cursor &) = delete;
diff --git a/lldb/include/lldb/Utility/DataEncoder.h b/lldb/include/lldb/Utility/DataEncoder.h
index 64e75f9043406..b944c09d5c47f 100644
--- a/lldb/include/lldb/Utility/DataEncoder.h
+++ b/lldb/include/lldb/Utility/DataEncoder.h
@@ -226,10 +226,10 @@ class DataEncoder {
   size_t GetByteSize() const { return m_end - m_start; }
 
   /// A pointer to the first byte of data.
-  uint8_t *m_start;
+  uint8_t *m_start = nullptr;
 
   /// A pointer to the byte that is past the end of the data.
-  uint8_t *m_end;
+  uint8_t *m_end = nullptr;
 
   /// The byte order of the data we are extracting from.
   lldb::ByteOrder m_byte_order;
diff --git a/lldb/include/lldb/Utility/DataExtractor.h b/lldb/include/lldb/Utility/DataExtractor.h
index d4d9200e9bcd4..0923e5280cba9 100644
--- a/lldb/include/lldb/Utility/DataExtractor.h
+++ b/lldb/include/lldb/Utility/DataExtractor.h
@@ -997,15 +997,15 @@ class DataExtractor {
   }
 
   // Member variables
-  const uint8_t *m_start; ///< A pointer to the first byte of data.
-  const uint8_t
-      *m_end; ///< A pointer to the byte that is past the end of the data.
+  const uint8_t *m_start = nullptr; ///< A pointer to the first byte of data.
+  const uint8_t *m_end =
+      nullptr; ///< A pointer to the byte that is past the end of the data.
   lldb::ByteOrder
       m_byte_order;     ///< The byte order of the data we are extracting from.
   uint32_t m_addr_size; ///< The address size to use when extracting addresses.
   /// The shared pointer to data that can be shared among multiple instances
   lldb::DataBufferSP m_data_sp;
-  const uint32_t m_target_byte_size;
+  const uint32_t m_target_byte_size = 1;
 };
 
 } // namespace lldb_private
diff --git a/lldb/include/lldb/Utility/GDBRemote.h b/lldb/include/lldb/Utility/GDBRemote.h
index f76085927aaad..f658818de8062 100644
--- a/lldb/include/lldb/Utility/GDBRemote.h
+++ b/lldb/include/lldb/Utility/GDBRemote.h
@@ -55,9 +55,7 @@ struct GDBRemotePacket {
 
   enum Type { ePacketTypeInvalid = 0, ePacketTypeSend, ePacketTypeRecv };
 
-  GDBRemotePacket()
-      : packet(), type(ePacketTypeInvalid), bytes_transmitted(0), packet_idx(0),
-        tid(LLDB_INVALID_THREAD_ID) {}
+  GDBRemotePacket() : packet() {}
 
   void Clear() {
     packet.data.clear();
@@ -74,10 +72,10 @@ struct GDBRemotePacket {
   void Dump(Stream &strm) const;
 
   BinaryData packet;
-  Type type;
-  uint32_t bytes_transmitted;
-  uint32_t packet_idx;
-  lldb::tid_t tid;
+  Type type = ePacketTypeInvalid;
+  uint32_t bytes_transmitted = 0;
+  uint32_t packet_idx = 0;
+  lldb::tid_t tid = LLDB_INVALID_THREAD_ID;
 
 private:
   llvm::StringRef GetTypeStr() const;
diff --git a/lldb/include/lldb/Utility/ProcessInfo.h b/lldb/include/lldb/Utility/ProcessInfo.h
index 8f5a5f6d21fbd..3c59569263912 100644
--- a/lldb/include/lldb/Utility/ProcessInfo.h
+++ b/lldb/include/lldb/Utility/ProcessInfo.h
@@ -95,10 +95,10 @@ class ProcessInfo {
   // the resolved platform executable (which is in m_executable)
   Args m_arguments; // All program arguments except argv[0]
   Environment m_environment;
-  uint32_t m_uid;
-  uint32_t m_gid;
+  uint32_t m_uid = UINT32_MAX;
+  uint32_t m_gid = UINT32_MAX;
   ArchSpec m_arch;
-  lldb::pid_t m_pid;
+  lldb::pid_t m_pid = LLDB_INVALID_PROCESS_ID;
 };
 
 // ProcessInstanceInfo
@@ -107,9 +107,7 @@ class ProcessInfo {
 // to that process.
 class ProcessInstanceInfo : public ProcessInfo {
 public:
-  ProcessInstanceInfo()
-      : ProcessInfo(), m_euid(UINT32_MAX), m_egid(UINT32_MAX),
-        m_parent_pid(LLDB_INVALID_PROCESS_ID) {}
+  ProcessInstanceInfo() : ProcessInfo() {}
 
   ProcessInstanceInfo(const char *name, const ArchSpec &arch, lldb::pid_t pid)
       : ProcessInfo(name, arch, pid), m_euid(UINT32_MAX), m_egid(UINT32_MAX),
@@ -151,9 +149,9 @@ class ProcessInstanceInfo : public ProcessInfo {
 
 protected:
   friend struct llvm::yaml::MappingTraits<ProcessInstanceInfo>;
-  uint32_t m_euid;
-  uint32_t m_egid;
-  lldb::pid_t m_parent_pid;
+  uint32_t m_euid = UINT32_MAX;
+  uint32_t m_egid = UINT32_MAX;
+  lldb::pid_t m_parent_pid = LLDB_INVALID_PROCESS_ID;
 };
 
 typedef std::vector<ProcessInstanceInfo> ProcessInstanceInfoList;
@@ -164,9 +162,7 @@ typedef std::vector<ProcessInstanceInfo> ProcessInstanceInfoList;
 
 class ProcessInstanceInfoMatch {
 public:
-  ProcessInstanceInfoMatch()
-      : m_match_info(), m_name_match_type(NameMatch::Ignore),
-        m_match_all_users(false) {}
+  ProcessInstanceInfoMatch() : m_match_info() {}
 
   ProcessInstanceInfoMatch(const char *process_name,
                            NameMatch process_name_match_type)
@@ -211,8 +207,8 @@ class ProcessInstanceInfoMatch {
 
 protected:
   ProcessInstanceInfo m_match_info;
-  NameMatch m_name_match_type;
-  bool m_match_all_users;
+  NameMatch m_name_match_type = NameMatch::Ignore;
+  bool m_match_all_users = false;
 };
 
 namespace repro {
diff --git a/lldb/include/lldb/Utility/RegisterValue.h b/lldb/include/lldb/Utility/RegisterValue.h
index 4211b0a599921..1ece4f0eb79f7 100644
--- a/lldb/include/lldb/Utility/RegisterValue.h
+++ b/lldb/include/lldb/Utility/RegisterValue.h
@@ -43,8 +43,7 @@ class RegisterValue {
     eTypeBytes
   };
 
-  RegisterValue()
-      : m_type(eTypeInvalid), m_scalar(static_cast<unsigned long>(0)) {}
+  RegisterValue() : m_scalar(static_cast<unsigned long>(0)) {}
 
   explicit RegisterValue(uint8_t inst) : m_type(eTypeUInt8) { m_scalar = inst; }
 
@@ -257,7 +256,7 @@ class RegisterValue {
   void Clear();
 
 protected:
-  RegisterValue::Type m_type;
+  RegisterValue::Type m_type = eTypeInvalid;
   Scalar m_scalar;
 
   struct {
diff --git a/lldb/include/lldb/Utility/ReproducerInstrumentation.h b/lldb/include/lldb/Utility/ReproducerInstrumentation.h
index c8a98adf85c74..8812ef6b1d8f9 100644
--- a/lldb/include/lldb/Utility/ReproducerInstrumentation.h
+++ b/lldb/include/lldb/Utility/ReproducerInstrumentation.h
@@ -714,8 +714,7 @@ class InstrumentationData {
   friend llvm::optional_detail::OptionalStorage<InstrumentationData, true>;
   friend llvm::Optional<InstrumentationData>;
 
-  InstrumentationData()
-      : m_serializer(nullptr), m_deserializer(nullptr), m_registry(nullptr) {}
+  InstrumentationData() {}
   InstrumentationData(Serializer &serializer, Registry &registry)
       : m_serializer(&serializer), m_deserializer(nullptr),
         m_registry(&registry) {}
@@ -726,9 +725,9 @@ class InstrumentationData {
 private:
   static llvm::Optional<InstrumentationData> &InstanceImpl();
 
-  Serializer *m_serializer;
-  Deserializer *m_deserializer;
-  Registry *m_registry;
+  Serializer *m_serializer = nullptr;
+  Deserializer *m_deserializer = nullptr;
+  Registry *m_registry = nullptr;
 };
 
 struct EmptyArg {};
@@ -888,17 +887,17 @@ class Recorder {
   }
 #endif
 
-  Serializer *m_serializer;
+  Serializer *m_serializer = nullptr;
 
   /// Pretty function for logging.
   llvm::StringRef m_pretty_func;
   std::string m_pretty_args;
 
   /// Whether this function call was the one crossing the API boundary.
-  bool m_local_boundary;
+  bool m_local_boundary = false;
 
   /// Whether the return value was recorded explicitly.
-  bool m_result_recorded;
+  bool m_result_recorded = true;
 
   /// The sequence number for this pair of function and result.
   unsigned m_sequence;
diff --git a/lldb/include/lldb/Utility/Scalar.h b/lldb/include/lldb/Utility/Scalar.h
index f797aaf996260..2801b1bd63266 100644
--- a/lldb/include/lldb/Utility/Scalar.h
+++ b/lldb/include/lldb/Utility/Scalar.h
@@ -49,7 +49,7 @@ class Scalar {
   };
 
   // Constructors and Destructors
-  Scalar() : m_type(e_void), m_float(0.0f) {}
+  Scalar() : m_float(0.0f) {}
   Scalar(int v) : m_type(e_int), m_integer(MakeAPSInt(v)), m_float(0.0f) {}
   Scalar(unsigned int v)
       : m_type(e_int), m_integer(MakeAPSInt(v)), m_float(0.0f) {}
@@ -187,7 +187,7 @@ class Scalar {
                           size_t byte_size);
 
 protected:
-  Scalar::Type m_type;
+  Scalar::Type m_type = e_void;
   llvm::APSInt m_integer;
   llvm::APFloat m_float;
 
diff --git a/lldb/include/lldb/Utility/Status.h b/lldb/include/lldb/Utility/Status.h
index b5f90bea2eebb..61d663bdccba4 100644
--- a/lldb/include/lldb/Utility/Status.h
+++ b/lldb/include/lldb/Utility/Status.h
@@ -196,8 +196,9 @@ class Status {
 
 protected:
   /// Member variables
-  ValueType m_code;             ///< Status code as an integer value.
-  lldb::ErrorType m_type;       ///< The type of the above error code.
+  ValueType m_code = 0; ///< Status code as an integer value.
+  lldb::ErrorType m_type =
+      lldb::eErrorTypeInvalid;  ///< The type of the above error code.
   mutable std::string m_string; ///< A string representation of the error code.
 };
 
diff --git a/lldb/include/lldb/Utility/Stream.h b/lldb/include/lldb/Utility/Stream.h
index a5422f5f4c2aa..1a5fd343e4df0 100644
--- a/lldb/include/lldb/Utility/Stream.h
+++ b/lldb/include/lldb/Utility/Stream.h
@@ -361,10 +361,10 @@ class Stream {
 protected:
   // Member variables
   Flags m_flags;        ///< Dump flags.
-  uint32_t m_addr_size; ///< Size of an address in bytes.
+  uint32_t m_addr_size = 4; ///< Size of an address in bytes.
   lldb::ByteOrder
       m_byte_order;   ///< Byte order to use when encoding scalar types.
-  unsigned m_indent_level;         ///< Indention level.
+  unsigned m_indent_level = 0;     ///< Indention level.
   std::size_t m_bytes_written = 0; ///< Number of bytes written so far.
 
   void _PutHex8(uint8_t uvalue, bool add_prefix);
diff --git a/lldb/include/lldb/Utility/StringExtractor.h b/lldb/include/lldb/Utility/StringExtractor.h
index 996e59e84ec49..a4819378ce322 100644
--- a/lldb/include/lldb/Utility/StringExtractor.h
+++ b/lldb/include/lldb/Utility/StringExtractor.h
@@ -115,7 +115,7 @@ class StringExtractor {
   /// When extracting data from a packet, this index will march along as things
   /// get extracted. If set to UINT64_MAX the end of the packet data was
   /// reached when decoding information.
-  uint64_t m_index;
+  uint64_t m_index = 0;
 };
 
 #endif // LLDB_UTILITY_STRINGEXTRACTOR_H
diff --git a/lldb/include/lldb/Utility/StringExtractorGDBRemote.h b/lldb/include/lldb/Utility/StringExtractorGDBRemote.h
index bf99593249b2d..d78bd3b139b9d 100644
--- a/lldb/include/lldb/Utility/StringExtractorGDBRemote.h
+++ b/lldb/include/lldb/Utility/StringExtractorGDBRemote.h
@@ -23,7 +23,7 @@ class StringExtractorGDBRemote : public StringExtractor {
   typedef bool (*ResponseValidatorCallback)(
       void *baton, const StringExtractorGDBRemote &response);
 
-  StringExtractorGDBRemote() : StringExtractor(), m_validator(nullptr) {}
+  StringExtractorGDBRemote() : StringExtractor() {}
 
   StringExtractorGDBRemote(llvm::StringRef str)
       : StringExtractor(str), m_validator(nullptr) {}
@@ -201,7 +201,7 @@ class StringExtractorGDBRemote : public StringExtractor {
   GetPidTid(lldb::pid_t default_pid);
 
 protected:
-  ResponseValidatorCallback m_validator;
+  ResponseValidatorCallback m_validator = nullptr;
   void *m_validator_baton;
 };
 
diff --git a/lldb/include/lldb/Utility/VMRange.h b/lldb/include/lldb/Utility/VMRange.h
index d1dfa3adb0c35..3c7ac61cdd707 100644
--- a/lldb/include/lldb/Utility/VMRange.h
+++ b/lldb/include/lldb/Utility/VMRange.h
@@ -26,7 +26,7 @@ class VMRange {
   typedef collection::iterator iterator;
   typedef collection::const_iterator const_iterator;
 
-  VMRange() : m_base_addr(0), m_byte_size(0) {}
+  VMRange() {}
 
   VMRange(lldb::addr_t start_addr, lldb::addr_t end_addr)
       : m_base_addr(start_addr),
@@ -88,8 +88,8 @@ class VMRange {
                             const VMRange &range);
 
 protected:
-  lldb::addr_t m_base_addr;
-  lldb::addr_t m_byte_size;
+  lldb::addr_t m_base_addr = 0;
+  lldb::addr_t m_byte_size = 0;
 };
 
 bool operator==(const VMRange &lhs, const VMRange &rhs);
diff --git a/lldb/source/API/SBBlock.cpp b/lldb/source/API/SBBlock.cpp
index a5fee445d5c6a..5c49053dd972e 100644
--- a/lldb/source/API/SBBlock.cpp
+++ b/lldb/source/API/SBBlock.cpp
@@ -25,9 +25,7 @@
 using namespace lldb;
 using namespace lldb_private;
 
-SBBlock::SBBlock() : m_opaque_ptr(nullptr) {
-  LLDB_RECORD_CONSTRUCTOR_NO_ARGS(SBBlock);
-}
+SBBlock::SBBlock() { LLDB_RECORD_CONSTRUCTOR_NO_ARGS(SBBlock); }
 
 SBBlock::SBBlock(lldb_private::Block *lldb_object_ptr)
     : m_opaque_ptr(lldb_object_ptr) {}
diff --git a/lldb/source/API/SBBroadcaster.cpp b/lldb/source/API/SBBroadcaster.cpp
index d42d7ce2a536a..2e6d837f102b1 100644
--- a/lldb/source/API/SBBroadcaster.cpp
+++ b/lldb/source/API/SBBroadcaster.cpp
@@ -16,7 +16,7 @@
 using namespace lldb;
 using namespace lldb_private;
 
-SBBroadcaster::SBBroadcaster() : m_opaque_sp(), m_opaque_ptr(nullptr) {
+SBBroadcaster::SBBroadcaster() : m_opaque_sp() {
   LLDB_RECORD_CONSTRUCTOR_NO_ARGS(SBBroadcaster);
 }
 
diff --git a/lldb/source/API/SBCommandReturnObject.cpp b/lldb/source/API/SBCommandReturnObject.cpp
index fddf90b664814..9ebdbfc6080ce 100644
--- a/lldb/source/API/SBCommandReturnObject.cpp
+++ b/lldb/source/API/SBCommandReturnObject.cpp
@@ -21,8 +21,7 @@ using namespace lldb_private;
 
 class lldb_private::SBCommandReturnObjectImpl {
 public:
-  SBCommandReturnObjectImpl()
-      : m_ptr(new CommandReturnObject(false)), m_owned(true) {}
+  SBCommandReturnObjectImpl() : m_ptr(new CommandReturnObject(false)) {}
   SBCommandReturnObjectImpl(CommandReturnObject &ref)
       : m_ptr(&ref), m_owned(false) {}
   SBCommandReturnObjectImpl(const SBCommandReturnObjectImpl &rhs)
@@ -42,7 +41,7 @@ class lldb_private::SBCommandReturnObjectImpl {
 
 private:
   CommandReturnObject *m_ptr;
-  bool m_owned;
+  bool m_owned = true;
 };
 
 SBCommandReturnObject::SBCommandReturnObject()
diff --git a/lldb/source/API/SBCommunication.cpp b/lldb/source/API/SBCommunication.cpp
index d55ecd35b5570..9a2ab89d5e4ed 100644
--- a/lldb/source/API/SBCommunication.cpp
+++ b/lldb/source/API/SBCommunication.cpp
@@ -16,7 +16,7 @@
 using namespace lldb;
 using namespace lldb_private;
 
-SBCommunication::SBCommunication() : m_opaque(nullptr), m_opaque_owned(false) {
+SBCommunication::SBCommunication() {
   LLDB_RECORD_CONSTRUCTOR_NO_ARGS(SBCommunication);
 }
 
diff --git a/lldb/source/API/SBCompileUnit.cpp b/lldb/source/API/SBCompileUnit.cpp
index 36df480dd094d..a44d3b8971100 100644
--- a/lldb/source/API/SBCompileUnit.cpp
+++ b/lldb/source/API/SBCompileUnit.cpp
@@ -21,7 +21,7 @@
 using namespace lldb;
 using namespace lldb_private;
 
-SBCompileUnit::SBCompileUnit() : m_opaque_ptr(nullptr) {
+SBCompileUnit::SBCompileUnit() {
   LLDB_RECORD_CONSTRUCTOR_NO_ARGS(SBCompileUnit);
 }
 
diff --git a/lldb/source/API/SBEvent.cpp b/lldb/source/API/SBEvent.cpp
index 2776ec49c0924..a0b606e3812ef 100644
--- a/lldb/source/API/SBEvent.cpp
+++ b/lldb/source/API/SBEvent.cpp
@@ -22,9 +22,7 @@
 using namespace lldb;
 using namespace lldb_private;
 
-SBEvent::SBEvent() : m_event_sp(), m_opaque_ptr(nullptr) {
-  LLDB_RECORD_CONSTRUCTOR_NO_ARGS(SBEvent);
-}
+SBEvent::SBEvent() : m_event_sp() { LLDB_RECORD_CONSTRUCTOR_NO_ARGS(SBEvent); }
 
 SBEvent::SBEvent(uint32_t event_type, const char *cstr, uint32_t cstr_len)
     : m_event_sp(new Event(event_type, new EventDataBytes(cstr, cstr_len))),
diff --git a/lldb/source/API/SBFunction.cpp b/lldb/source/API/SBFunction.cpp
index 7d81716347525..2d0cb239de756 100644
--- a/lldb/source/API/SBFunction.cpp
+++ b/lldb/source/API/SBFunction.cpp
@@ -22,9 +22,7 @@
 using namespace lldb;
 using namespace lldb_private;
 
-SBFunction::SBFunction() : m_opaque_ptr(nullptr) {
-  LLDB_RECORD_CONSTRUCTOR_NO_ARGS(SBFunction);
-}
+SBFunction::SBFunction() { LLDB_RECORD_CONSTRUCTOR_NO_ARGS(SBFunction); }
 
 SBFunction::SBFunction(lldb_private::Function *lldb_object_ptr)
     : m_opaque_ptr(lldb_object_ptr) {}
diff --git a/lldb/source/API/SBListener.cpp b/lldb/source/API/SBListener.cpp
index f3463268b3b5e..6e5e15de7b3d4 100644
--- a/lldb/source/API/SBListener.cpp
+++ b/lldb/source/API/SBListener.cpp
@@ -20,7 +20,7 @@
 using namespace lldb;
 using namespace lldb_private;
 
-SBListener::SBListener() : m_opaque_sp(), m_unused_ptr(nullptr) {
+SBListener::SBListener() : m_opaque_sp() {
   LLDB_RECORD_CONSTRUCTOR_NO_ARGS(SBListener);
 }
 
diff --git a/lldb/source/API/SBPlatform.cpp b/lldb/source/API/SBPlatform.cpp
index 7043367b13438..496c40a0678fe 100644
--- a/lldb/source/API/SBPlatform.cpp
+++ b/lldb/source/API/SBPlatform.cpp
@@ -32,7 +32,7 @@ using namespace lldb_private;
 struct PlatformConnectOptions {
   PlatformConnectOptions(const char *url = nullptr)
       : m_url(), m_rsync_options(), m_rsync_remote_path_prefix(),
-        m_rsync_enabled(false), m_rsync_omit_hostname_from_remote_path(false),
+
         m_local_cache_directory() {
     if (url && url[0])
       m_url = url;
@@ -43,8 +43,8 @@ struct PlatformConnectOptions {
   std::string m_url;
   std::string m_rsync_options;
   std::string m_rsync_remote_path_prefix;
-  bool m_rsync_enabled;
-  bool m_rsync_omit_hostname_from_remote_path;
+  bool m_rsync_enabled = false;
+  bool m_rsync_omit_hostname_from_remote_path = false;
   ConstString m_local_cache_directory;
 };
 
@@ -61,7 +61,7 @@ struct PlatformShellCommand {
   }
 
   PlatformShellCommand(llvm::StringRef shell_command = llvm::StringRef())
-      : m_shell(), m_command(), m_working_dir(), m_status(0), m_signo(0) {
+      : m_shell(), m_command(), m_working_dir() {
     if (!shell_command.empty())
       m_command = shell_command.str();
   }
@@ -72,8 +72,8 @@ struct PlatformShellCommand {
   std::string m_command;
   std::string m_working_dir;
   std::string m_output;
-  int m_status;
-  int m_signo;
+  int m_status = 0;
+  int m_signo = 0;
   Timeout<std::ratio<1>> m_timeout = llvm::None;
 };
 // SBPlatformConnectOptions
diff --git a/lldb/source/API/SBQueue.cpp b/lldb/source/API/SBQueue.cpp
index 75674dbc00bb0..746df9e79d61b 100644
--- a/lldb/source/API/SBQueue.cpp
+++ b/lldb/source/API/SBQueue.cpp
@@ -27,9 +27,7 @@ namespace lldb_private {
 
 class QueueImpl {
 public:
-  QueueImpl()
-      : m_queue_wp(), m_threads(), m_thread_list_fetched(false),
-        m_pending_items(), m_pending_items_fetched(false) {}
+  QueueImpl() : m_queue_wp(), m_threads(), m_pending_items() {}
 
   QueueImpl(const lldb::QueueSP &queue_sp)
       : m_queue_wp(), m_threads(), m_thread_list_fetched(false),
@@ -210,10 +208,11 @@ class QueueImpl {
   lldb::QueueWP m_queue_wp;
   std::vector<lldb::ThreadWP>
       m_threads; // threads currently executing this queue's items
-  bool
-      m_thread_list_fetched; // have we tried to fetch the threads list already?
+  bool m_thread_list_fetched =
+      false; // have we tried to fetch the threads list already?
   std::vector<lldb::QueueItemSP> m_pending_items; // items currently enqueued
-  bool m_pending_items_fetched; // have we tried to fetch the item list already?
+  bool m_pending_items_fetched =
+      false; // have we tried to fetch the item list already?
 };
 }
 
diff --git a/lldb/source/API/SBStream.cpp b/lldb/source/API/SBStream.cpp
index eb81153084e8c..66172d248bf36 100644
--- a/lldb/source/API/SBStream.cpp
+++ b/lldb/source/API/SBStream.cpp
@@ -19,7 +19,7 @@
 using namespace lldb;
 using namespace lldb_private;
 
-SBStream::SBStream() : m_opaque_up(new StreamString()), m_is_file(false) {
+SBStream::SBStream() : m_opaque_up(new StreamString()) {
   LLDB_RECORD_CONSTRUCTOR_NO_ARGS(SBStream);
 }
 
diff --git a/lldb/source/API/SBSymbol.cpp b/lldb/source/API/SBSymbol.cpp
index 7b9c90032e1a8..d3abc13675f5b 100644
--- a/lldb/source/API/SBSymbol.cpp
+++ b/lldb/source/API/SBSymbol.cpp
@@ -18,9 +18,7 @@
 using namespace lldb;
 using namespace lldb_private;
 
-SBSymbol::SBSymbol() : m_opaque_ptr(nullptr) {
-  LLDB_RECORD_CONSTRUCTOR_NO_ARGS(SBSymbol);
-}
+SBSymbol::SBSymbol() { LLDB_RECORD_CONSTRUCTOR_NO_ARGS(SBSymbol); }
 
 SBSymbol::SBSymbol(lldb_private::Symbol *lldb_object_ptr)
     : m_opaque_ptr(lldb_object_ptr) {}
diff --git a/lldb/source/API/SBVariablesOptions.cpp b/lldb/source/API/SBVariablesOptions.cpp
index 4ef16364e6280..1af582a0c3d70 100644
--- a/lldb/source/API/SBVariablesOptions.cpp
+++ b/lldb/source/API/SBVariablesOptions.cpp
@@ -21,9 +21,7 @@ class VariablesOptionsImpl {
   VariablesOptionsImpl()
       : m_include_arguments(false), m_include_locals(false),
         m_include_statics(false), m_in_scope_only(false),
-        m_include_runtime_support_values(false),
-        m_include_recognized_arguments(eLazyBoolCalculate),
-        m_use_dynamic(lldb::eNoDynamicValues) {}
+        m_include_runtime_support_values(false) {}
 
   VariablesOptionsImpl(const VariablesOptionsImpl &) = default;
 
@@ -75,8 +73,9 @@ class VariablesOptionsImpl {
   bool m_include_statics : 1;
   bool m_in_scope_only : 1;
   bool m_include_runtime_support_values : 1;
-  LazyBool m_include_recognized_arguments; // can be overridden with a setting
-  lldb::DynamicValueType m_use_dynamic;
+  LazyBool m_include_recognized_arguments =
+      eLazyBoolCalculate; // can be overridden with a setting
+  lldb::DynamicValueType m_use_dynamic = lldb::eNoDynamicValues;
 };
 
 SBVariablesOptions::SBVariablesOptions()
diff --git a/lldb/source/Breakpoint/Stoppoint.cpp b/lldb/source/Breakpoint/Stoppoint.cpp
index b5c8334333cfb..b2c4a7eeb253f 100644
--- a/lldb/source/Breakpoint/Stoppoint.cpp
+++ b/lldb/source/Breakpoint/Stoppoint.cpp
@@ -14,7 +14,7 @@ using namespace lldb;
 using namespace lldb_private;
 
 // Stoppoint constructor
-Stoppoint::Stoppoint() : m_bid(LLDB_INVALID_BREAK_ID) {}
+Stoppoint::Stoppoint() {}
 
 // Destructor
 Stoppoint::~Stoppoint() {}
diff --git a/lldb/source/Breakpoint/StoppointCallbackContext.cpp b/lldb/source/Breakpoint/StoppointCallbackContext.cpp
index 640db8bb9c96a..a561c99b1d924 100644
--- a/lldb/source/Breakpoint/StoppointCallbackContext.cpp
+++ b/lldb/source/Breakpoint/StoppointCallbackContext.cpp
@@ -10,8 +10,7 @@
 
 using namespace lldb_private;
 
-StoppointCallbackContext::StoppointCallbackContext()
-    : event(nullptr), exe_ctx_ref(), is_synchronous(false) {}
+StoppointCallbackContext::StoppointCallbackContext() : exe_ctx_ref() {}
 
 StoppointCallbackContext::StoppointCallbackContext(
     Event *e, const ExecutionContext &exe_ctx, bool synchronously)
diff --git a/lldb/source/Breakpoint/WatchpointList.cpp b/lldb/source/Breakpoint/WatchpointList.cpp
index a6f651e84955b..8599c3cf30fad 100644
--- a/lldb/source/Breakpoint/WatchpointList.cpp
+++ b/lldb/source/Breakpoint/WatchpointList.cpp
@@ -12,8 +12,7 @@
 using namespace lldb;
 using namespace lldb_private;
 
-WatchpointList::WatchpointList()
-    : m_watchpoints(), m_mutex(), m_next_wp_id(0) {}
+WatchpointList::WatchpointList() : m_watchpoints(), m_mutex() {}
 
 WatchpointList::~WatchpointList() {}
 
diff --git a/lldb/source/Breakpoint/WatchpointOptions.cpp b/lldb/source/Breakpoint/WatchpointOptions.cpp
index f01f5ad3dd271..a578e8744efbd 100644
--- a/lldb/source/Breakpoint/WatchpointOptions.cpp
+++ b/lldb/source/Breakpoint/WatchpointOptions.cpp
@@ -28,7 +28,7 @@ bool WatchpointOptions::NullCallback(void *baton,
 // WatchpointOptions constructor
 WatchpointOptions::WatchpointOptions()
     : m_callback(WatchpointOptions::NullCallback), m_callback_baton_sp(),
-      m_callback_is_synchronous(false), m_thread_spec_up() {}
+      m_thread_spec_up() {}
 
 // WatchpointOptions copy constructor
 WatchpointOptions::WatchpointOptions(const WatchpointOptions &rhs)
diff --git a/lldb/source/Commands/CommandObjectBreakpoint.cpp b/lldb/source/Commands/CommandObjectBreakpoint.cpp
index 0844c56cef2f6..724eacdebd5ff 100644
--- a/lldb/source/Commands/CommandObjectBreakpoint.cpp
+++ b/lldb/source/Commands/CommandObjectBreakpoint.cpp
@@ -242,15 +242,8 @@ class CommandObjectBreakpointSet : public CommandObjectParsed {
   class CommandOptions : public OptionGroup {
   public:
     CommandOptions()
-        : OptionGroup(), m_condition(), m_filenames(), m_line_num(0),
-          m_column(0), m_func_names(),
-          m_func_name_type_mask(eFunctionNameTypeNone), m_func_regexp(),
-          m_source_text_regexp(), m_modules(), m_load_addr(), m_catch_bp(false),
-          m_throw_bp(true), m_hardware(false),
-          m_exception_language(eLanguageTypeUnknown),
-          m_language(lldb::eLanguageTypeUnknown),
-          m_skip_prologue(eLazyBoolCalculate), m_all_files(false),
-          m_move_to_nearest_code(eLazyBoolCalculate) {}
+        : OptionGroup(), m_condition(), m_filenames(), m_func_names(),
+          m_func_regexp(), m_source_text_regexp(), m_modules() {}
 
     ~CommandOptions() override = default;
 
@@ -500,25 +493,25 @@ class CommandObjectBreakpointSet : public CommandObjectParsed {
 
     std::string m_condition;
     FileSpecList m_filenames;
-    uint32_t m_line_num;
-    uint32_t m_column;
+    uint32_t m_line_num = 0;
+    uint32_t m_column = 0;
     std::vector<std::string> m_func_names;
     std::vector<std::string> m_breakpoint_names;
-    lldb::FunctionNameType m_func_name_type_mask;
+    lldb::FunctionNameType m_func_name_type_mask = eFunctionNameTypeNone;
     std::string m_func_regexp;
     std::string m_source_text_regexp;
     FileSpecList m_modules;
-    lldb::addr_t m_load_addr;
+    lldb::addr_t m_load_addr = 0;
     lldb::addr_t m_offset_addr;
-    bool m_catch_bp;
-    bool m_throw_bp;
-    bool m_hardware; // Request to use hardware breakpoints
-    lldb::LanguageType m_exception_language;
-    lldb::LanguageType m_language;
-    LazyBool m_skip_prologue;
-    bool m_all_files;
+    bool m_catch_bp = false;
+    bool m_throw_bp = true;
+    bool m_hardware = false; // Request to use hardware breakpoints
+    lldb::LanguageType m_exception_language = eLanguageTypeUnknown;
+    lldb::LanguageType m_language = lldb::eLanguageTypeUnknown;
+    LazyBool m_skip_prologue = eLazyBoolCalculate;
+    bool m_all_files = false;
     Args m_exception_extra_args;
-    LazyBool m_move_to_nearest_code;
+    LazyBool m_move_to_nearest_code = eLazyBoolCalculate;
     std::unordered_set<std::string> m_source_regex_func_names;
     std::string m_current_key;
   };
@@ -1133,9 +1126,7 @@ class CommandObjectBreakpointList : public CommandObjectParsed {
 
   class CommandOptions : public Options {
   public:
-    CommandOptions()
-        : Options(), m_level(lldb::eDescriptionLevelBrief), m_use_dummy(false) {
-    }
+    CommandOptions() : Options() {}
 
     ~CommandOptions() override = default;
 
@@ -1179,10 +1170,10 @@ class CommandObjectBreakpointList : public CommandObjectParsed {
 
     // Instance variables to hold the values for command options.
 
-    lldb::DescriptionLevel m_level;
+    lldb::DescriptionLevel m_level = lldb::eDescriptionLevelBrief;
 
     bool m_internal;
-    bool m_use_dummy;
+    bool m_use_dummy = false;
   };
 
 protected:
@@ -1268,7 +1259,7 @@ class CommandObjectBreakpointClear : public CommandObjectParsed {
 
   class CommandOptions : public Options {
   public:
-    CommandOptions() : Options(), m_filename(), m_line_num(0) {}
+    CommandOptions() : Options(), m_filename() {}
 
     ~CommandOptions() override = default;
 
@@ -1305,7 +1296,7 @@ class CommandObjectBreakpointClear : public CommandObjectParsed {
     // Instance variables to hold the values for command options.
 
     std::string m_filename;
-    uint32_t m_line_num;
+    uint32_t m_line_num = 0;
   };
 
 protected:
@@ -1423,8 +1414,7 @@ class CommandObjectBreakpointDelete : public CommandObjectParsed {
 
   class CommandOptions : public Options {
   public:
-    CommandOptions() : Options(), m_use_dummy(false), m_force(false),
-      m_delete_disabled(false) {}
+    CommandOptions() : Options() {}
 
     ~CommandOptions() override = default;
 
@@ -1464,9 +1454,9 @@ class CommandObjectBreakpointDelete : public CommandObjectParsed {
     }
 
     // Instance variables to hold the values for command options.
-    bool m_use_dummy;
-    bool m_force;
-    bool m_delete_disabled;
+    bool m_use_dummy = false;
+    bool m_force = false;
+    bool m_delete_disabled = false;
   };
 
 protected:
diff --git a/lldb/source/Commands/CommandObjectBreakpointCommand.cpp b/lldb/source/Commands/CommandObjectBreakpointCommand.cpp
index 127cde061120d..81abc1ba726e0 100644
--- a/lldb/source/Commands/CommandObjectBreakpointCommand.cpp
+++ b/lldb/source/Commands/CommandObjectBreakpointCommand.cpp
@@ -283,10 +283,7 @@ are no syntax errors may indicate that a function was declared but never called.
 
   class CommandOptions : public OptionGroup {
   public:
-    CommandOptions()
-        : OptionGroup(), m_use_commands(false), m_use_script_language(false),
-          m_script_language(eScriptLanguageNone), m_use_one_liner(false),
-          m_one_liner() {}
+    CommandOptions() : OptionGroup(), m_one_liner() {}
 
     ~CommandOptions() override = default;
 
@@ -356,12 +353,12 @@ are no syntax errors may indicate that a function was declared but never called.
 
     // Instance variables to hold the values for command options.
 
-    bool m_use_commands;
-    bool m_use_script_language;
-    lldb::ScriptLanguage m_script_language;
+    bool m_use_commands = false;
+    bool m_use_script_language = false;
+    lldb::ScriptLanguage m_script_language = eScriptLanguageNone;
 
     // Instance variables to hold the values for one_liner options.
-    bool m_use_one_liner;
+    bool m_use_one_liner = false;
     std::string m_one_liner;
     bool m_stop_on_error;
     bool m_use_dummy;
@@ -510,7 +507,7 @@ class CommandObjectBreakpointCommandDelete : public CommandObjectParsed {
 
   class CommandOptions : public Options {
   public:
-    CommandOptions() : Options(), m_use_dummy(false) {}
+    CommandOptions() : Options() {}
 
     ~CommandOptions() override = default;
 
@@ -540,7 +537,7 @@ class CommandObjectBreakpointCommandDelete : public CommandObjectParsed {
     }
 
     // Instance variables to hold the values for command options.
-    bool m_use_dummy;
+    bool m_use_dummy = false;
   };
 
 protected:
diff --git a/lldb/source/Commands/CommandObjectCommands.cpp b/lldb/source/Commands/CommandObjectCommands.cpp
index 74b16a613ffae..94e670a3fad29 100644
--- a/lldb/source/Commands/CommandObjectCommands.cpp
+++ b/lldb/source/Commands/CommandObjectCommands.cpp
@@ -1387,8 +1387,7 @@ class CommandObjectCommandsScriptAdd : public CommandObjectParsed,
   class CommandOptions : public Options {
   public:
     CommandOptions()
-        : Options(), m_class_name(), m_funct_name(), m_short_help(),
-          m_synchronicity(eScriptedCommandSynchronicitySynchronous) {}
+        : Options(), m_class_name(), m_funct_name(), m_short_help() {}
 
     ~CommandOptions() override = default;
 
@@ -1442,7 +1441,8 @@ class CommandObjectCommandsScriptAdd : public CommandObjectParsed,
     std::string m_class_name;
     std::string m_funct_name;
     std::string m_short_help;
-    ScriptedCommandSynchronicity m_synchronicity;
+    ScriptedCommandSynchronicity m_synchronicity =
+        eScriptedCommandSynchronicitySynchronous;
   };
 
   void IOHandlerActivated(IOHandler &io_handler, bool interactive) override {
diff --git a/lldb/source/Commands/CommandObjectDisassemble.cpp b/lldb/source/Commands/CommandObjectDisassemble.cpp
index 8d2b13a5a4c00..a6d5ab68d569b 100644
--- a/lldb/source/Commands/CommandObjectDisassemble.cpp
+++ b/lldb/source/Commands/CommandObjectDisassemble.cpp
@@ -31,10 +31,7 @@ using namespace lldb_private;
 #include "CommandOptions.inc"
 
 CommandObjectDisassemble::CommandOptions::CommandOptions()
-    : Options(), num_lines_context(0), num_instructions(0), func_name(),
-      current_function(false), start_addr(), end_addr(), at_pc(false),
-      frame_line(false), plugin_name(), flavor_string(), arch(),
-      some_location_specified(false), symbol_containing_addr() {
+    : Options(), func_name(), plugin_name(), flavor_string(), arch() {
   OptionParsingStarting(nullptr);
 }
 
diff --git a/lldb/source/Commands/CommandObjectDisassemble.h b/lldb/source/Commands/CommandObjectDisassemble.h
index 340bf648de176..a4b3df8724da6 100644
--- a/lldb/source/Commands/CommandObjectDisassemble.h
+++ b/lldb/source/Commands/CommandObjectDisassemble.h
@@ -46,22 +46,22 @@ class CommandObjectDisassemble : public CommandObjectParsed {
 
     bool show_mixed; // Show mixed source/assembly
     bool show_bytes;
-    uint32_t num_lines_context;
-    uint32_t num_instructions;
+    uint32_t num_lines_context = 0;
+    uint32_t num_instructions = 0;
     bool raw;
     std::string func_name;
-    bool current_function;
-    lldb::addr_t start_addr;
-    lldb::addr_t end_addr;
-    bool at_pc;
-    bool frame_line;
+    bool current_function = false;
+    lldb::addr_t start_addr = 0;
+    lldb::addr_t end_addr = 0;
+    bool at_pc = false;
+    bool frame_line = false;
     std::string plugin_name;
     std::string flavor_string;
     ArchSpec arch;
-    bool some_location_specified; // If no location was specified, we'll select
-                                  // "at_pc".  This should be set
+    bool some_location_specified = false; // If no location was specified, we'll
+                                          // select "at_pc".  This should be set
     // in SetOptionValue if anything the selects a location is set.
-    lldb::addr_t symbol_containing_addr;
+    lldb::addr_t symbol_containing_addr = 0;
     bool force = false;
   };
 
diff --git a/lldb/source/Commands/CommandObjectLog.cpp b/lldb/source/Commands/CommandObjectLog.cpp
index 4016b07c91edb..288ffdb183b9e 100644
--- a/lldb/source/Commands/CommandObjectLog.cpp
+++ b/lldb/source/Commands/CommandObjectLog.cpp
@@ -76,7 +76,7 @@ class CommandObjectLogEnable : public CommandObjectParsed {
 
   class CommandOptions : public Options {
   public:
-    CommandOptions() : Options(), log_file(), log_options(0) {}
+    CommandOptions() : Options(), log_file() {}
 
     ~CommandOptions() override = default;
 
@@ -136,7 +136,7 @@ class CommandObjectLogEnable : public CommandObjectParsed {
     // Instance variables to hold the values for command options.
 
     FileSpec log_file;
-    uint32_t log_options;
+    uint32_t log_options = 0;
   };
 
   void
diff --git a/lldb/source/Commands/CommandObjectMemory.cpp b/lldb/source/Commands/CommandObjectMemory.cpp
index 19c13c089503d..e6decf120aebb 100644
--- a/lldb/source/Commands/CommandObjectMemory.cpp
+++ b/lldb/source/Commands/CommandObjectMemory.cpp
@@ -46,8 +46,8 @@ using namespace lldb_private;
 class OptionGroupReadMemory : public OptionGroup {
 public:
   OptionGroupReadMemory()
-      : m_num_per_line(1, 1), m_output_as_binary(false), m_view_as_type(),
-        m_offset(0, 0), m_language_for_type(eLanguageTypeUnknown) {}
+      : m_num_per_line(1, 1), m_view_as_type(), m_offset(0, 0),
+        m_language_for_type(eLanguageTypeUnknown) {}
 
   ~OptionGroupReadMemory() override = default;
 
@@ -270,7 +270,7 @@ class OptionGroupReadMemory : public OptionGroup {
   }
 
   OptionValueUInt64 m_num_per_line;
-  bool m_output_as_binary;
+  bool m_output_as_binary = false;
   OptionValueString m_view_as_type;
   bool m_force;
   OptionValueUInt64 m_offset;
diff --git a/lldb/source/Commands/CommandObjectPlatform.cpp b/lldb/source/Commands/CommandObjectPlatform.cpp
index d0c58ac807ff5..b95b1c3d5655f 100644
--- a/lldb/source/Commands/CommandObjectPlatform.cpp
+++ b/lldb/source/Commands/CommandObjectPlatform.cpp
@@ -1215,8 +1215,7 @@ class CommandObjectPlatformProcessList : public CommandObjectParsed {
 
   class CommandOptions : public Options {
   public:
-    CommandOptions()
-        : Options(), match_info(), show_args(false), verbose(false) {}
+    CommandOptions() : Options(), match_info() {}
 
     ~CommandOptions() override = default;
 
@@ -1351,8 +1350,8 @@ class CommandObjectPlatformProcessList : public CommandObjectParsed {
     // Instance variables to hold the values for command options.
 
     ProcessInstanceInfoMatch match_info;
-    bool show_args;
-    bool verbose;
+    bool show_args = false;
+    bool verbose = false;
   };
 
   CommandOptions m_options;
diff --git a/lldb/source/Commands/CommandObjectProcess.cpp b/lldb/source/Commands/CommandObjectProcess.cpp
index 3e45b71cef085..031b7151d7af4 100644
--- a/lldb/source/Commands/CommandObjectProcess.cpp
+++ b/lldb/source/Commands/CommandObjectProcess.cpp
@@ -1250,7 +1250,7 @@ class CommandObjectProcessStatus : public CommandObjectParsed {
 
   class CommandOptions : public Options {
   public:
-    CommandOptions() : Options(), m_verbose(false) {}
+    CommandOptions() : Options() {}
 
     ~CommandOptions() override = default;
 
@@ -1278,7 +1278,7 @@ class CommandObjectProcessStatus : public CommandObjectParsed {
     }
 
     // Instance variables to hold the values for command options.
-    bool m_verbose;
+    bool m_verbose = false;
   };
 
 protected:
diff --git a/lldb/source/Commands/CommandObjectSettings.cpp b/lldb/source/Commands/CommandObjectSettings.cpp
index d869377c578cf..82335f432903e 100644
--- a/lldb/source/Commands/CommandObjectSettings.cpp
+++ b/lldb/source/Commands/CommandObjectSettings.cpp
@@ -87,7 +87,7 @@ insert-before or insert-after.");
 
   class CommandOptions : public Options {
   public:
-    CommandOptions() : Options(), m_global(false) {}
+    CommandOptions() : Options() {}
 
     ~CommandOptions() override = default;
 
@@ -120,7 +120,7 @@ insert-before or insert-after.");
     }
 
     // Instance variables to hold the values for command options.
-    bool m_global;
+    bool m_global = false;
     bool m_force;
   };
 
diff --git a/lldb/source/Commands/CommandObjectTarget.cpp b/lldb/source/Commands/CommandObjectTarget.cpp
index bc038e326d976..1df2bca98aa7d 100644
--- a/lldb/source/Commands/CommandObjectTarget.cpp
+++ b/lldb/source/Commands/CommandObjectTarget.cpp
@@ -1969,7 +1969,7 @@ class CommandObjectTargetModulesDumpSymtab
 
   class CommandOptions : public Options {
   public:
-    CommandOptions() : Options(), m_sort_order(eSortOrderNone) {}
+    CommandOptions() : Options() {}
 
     ~CommandOptions() override = default;
 
@@ -2005,7 +2005,7 @@ class CommandObjectTargetModulesDumpSymtab
       return llvm::makeArrayRef(g_target_modules_dump_symtab_options);
     }
 
-    SortOrder m_sort_order;
+    SortOrder m_sort_order = eSortOrderNone;
     OptionValueBoolean m_prefer_mangled = {false, false};
   };
 
@@ -2902,9 +2902,7 @@ class CommandObjectTargetModulesList : public CommandObjectParsed {
 public:
   class CommandOptions : public Options {
   public:
-    CommandOptions()
-        : Options(), m_format_array(), m_use_global_module_list(false),
-          m_module_addr(LLDB_INVALID_ADDRESS) {}
+    CommandOptions() : Options(), m_format_array() {}
 
     ~CommandOptions() override = default;
 
@@ -2939,8 +2937,8 @@ class CommandObjectTargetModulesList : public CommandObjectParsed {
     // Instance variables to hold the values for command options.
     typedef std::vector<std::pair<char, uint32_t>> FormatWidthCollection;
     FormatWidthCollection m_format_array;
-    bool m_use_global_module_list;
-    lldb::addr_t m_module_addr;
+    bool m_use_global_module_list = false;
+    lldb::addr_t m_module_addr = LLDB_INVALID_ADDRESS;
   };
 
   CommandObjectTargetModulesList(CommandInterpreter &interpreter)
@@ -3253,9 +3251,7 @@ class CommandObjectTargetModulesShowUnwind : public CommandObjectParsed {
 
   class CommandOptions : public Options {
   public:
-    CommandOptions()
-        : Options(), m_type(eLookupTypeInvalid), m_str(),
-          m_addr(LLDB_INVALID_ADDRESS) {}
+    CommandOptions() : Options(), m_str() {}
 
     ~CommandOptions() override = default;
 
@@ -3301,9 +3297,10 @@ class CommandObjectTargetModulesShowUnwind : public CommandObjectParsed {
 
     // Instance variables to hold the values for command options.
 
-    int m_type;        // Should be a eLookupTypeXXX enum after parsing options
+    int m_type = eLookupTypeInvalid; // Should be a eLookupTypeXXX enum after
+                                     // parsing options
     std::string m_str; // Holds name lookup
-    lldb::addr_t m_addr; // Holds the address to lookup
+    lldb::addr_t m_addr = LLDB_INVALID_ADDRESS; // Holds the address to lookup
   };
 
   CommandObjectTargetModulesShowUnwind(CommandInterpreter &interpreter)
@@ -4424,11 +4421,7 @@ class CommandObjectTargetStopHookAdd : public CommandObjectParsed,
 public:
   class CommandOptions : public OptionGroup {
   public:
-    CommandOptions()
-        : OptionGroup(), m_line_start(0), m_line_end(UINT_MAX),
-          m_func_name_type_mask(eFunctionNameTypeAuto),
-          m_sym_ctx_specified(false), m_thread_specified(false),
-          m_use_one_liner(false), m_one_liner() {}
+    CommandOptions() : OptionGroup(), m_line_end(UINT_MAX), m_one_liner() {}
 
     ~CommandOptions() override = default;
 
@@ -4555,20 +4548,21 @@ class CommandObjectTargetStopHookAdd : public CommandObjectParsed,
 
     std::string m_class_name;
     std::string m_function_name;
-    uint32_t m_line_start;
+    uint32_t m_line_start = 0;
     uint32_t m_line_end;
     std::string m_file_name;
     std::string m_module_name;
-    uint32_t m_func_name_type_mask; // A pick from lldb::FunctionNameType.
+    uint32_t m_func_name_type_mask =
+        eFunctionNameTypeAuto; // A pick from lldb::FunctionNameType.
     lldb::tid_t m_thread_id;
     uint32_t m_thread_index;
     std::string m_thread_name;
     std::string m_queue_name;
-    bool m_sym_ctx_specified;
+    bool m_sym_ctx_specified = false;
     bool m_no_inlines;
-    bool m_thread_specified;
+    bool m_thread_specified = false;
     // Instance variables to hold the values for one_liner options.
-    bool m_use_one_liner;
+    bool m_use_one_liner = false;
     std::vector<std::string> m_one_liner;
 
     bool m_auto_continue;
diff --git a/lldb/source/Commands/CommandObjectThread.cpp b/lldb/source/Commands/CommandObjectThread.cpp
index a88fda9fa3d4f..7e4709b33cc12 100644
--- a/lldb/source/Commands/CommandObjectThread.cpp
+++ b/lldb/source/Commands/CommandObjectThread.cpp
@@ -802,12 +802,10 @@ class CommandObjectThreadUntil : public CommandObjectParsed {
 public:
   class CommandOptions : public Options {
   public:
-    uint32_t m_thread_idx;
-    uint32_t m_frame_idx;
+    uint32_t m_thread_idx = LLDB_INVALID_THREAD_ID;
+    uint32_t m_frame_idx = LLDB_INVALID_FRAME_ID;
 
-    CommandOptions()
-        : Options(), m_thread_idx(LLDB_INVALID_THREAD_ID),
-          m_frame_idx(LLDB_INVALID_FRAME_ID) {
+    CommandOptions() : Options() {
       // Keep default values of all options in one place: OptionParsingStarting
       // ()
       OptionParsingStarting(nullptr);
@@ -1374,7 +1372,7 @@ class CommandObjectThreadReturn : public CommandObjectRaw {
 public:
   class CommandOptions : public Options {
   public:
-    CommandOptions() : Options(), m_from_expression(false) {
+    CommandOptions() : Options() {
       // Keep default values of all options in one place: OptionParsingStarting
       // ()
       OptionParsingStarting(nullptr);
@@ -1414,7 +1412,7 @@ class CommandObjectThreadReturn : public CommandObjectRaw {
       return llvm::makeArrayRef(g_thread_return_options);
     }
 
-    bool m_from_expression;
+    bool m_from_expression = false;
 
     // Instance variables to hold the values for command options.
   };
diff --git a/lldb/source/Commands/CommandObjectType.cpp b/lldb/source/Commands/CommandObjectType.cpp
index cc6bca09b0182..025d9eadd2ae3 100644
--- a/lldb/source/Commands/CommandObjectType.cpp
+++ b/lldb/source/Commands/CommandObjectType.cpp
@@ -2712,8 +2712,7 @@ class CommandObjectTypeLookup : public CommandObjectRaw {
 
   class CommandOptions : public OptionGroup {
   public:
-    CommandOptions()
-        : OptionGroup(), m_show_help(false), m_language(eLanguageTypeUnknown) {}
+    CommandOptions() : OptionGroup() {}
 
     ~CommandOptions() override = default;
 
@@ -2750,8 +2749,8 @@ class CommandObjectTypeLookup : public CommandObjectRaw {
 
     // Options table: Required for subclasses of Options.
 
-    bool m_show_help;
-    lldb::LanguageType m_language;
+    bool m_show_help = false;
+    lldb::LanguageType m_language = eLanguageTypeUnknown;
   };
 
   OptionGroupOptions m_option_group;
diff --git a/lldb/source/Commands/CommandObjectWatchpoint.cpp b/lldb/source/Commands/CommandObjectWatchpoint.cpp
index e7b1f31f3960d..b8be19f385233 100644
--- a/lldb/source/Commands/CommandObjectWatchpoint.cpp
+++ b/lldb/source/Commands/CommandObjectWatchpoint.cpp
@@ -166,11 +166,7 @@ class CommandObjectWatchpointList : public CommandObjectParsed {
 
   class CommandOptions : public Options {
   public:
-    CommandOptions()
-        : Options(),
-          m_level(lldb::eDescriptionLevelBrief) // Watchpoint List defaults to
-                                                // brief descriptions
-    {}
+    CommandOptions() : Options() {}
 
     ~CommandOptions() override = default;
 
@@ -206,7 +202,7 @@ class CommandObjectWatchpointList : public CommandObjectParsed {
 
     // Instance variables to hold the values for command options.
 
-    lldb::DescriptionLevel m_level;
+    lldb::DescriptionLevel m_level = lldb::eDescriptionLevelBrief;
   };
 
 protected:
@@ -467,7 +463,7 @@ class CommandObjectWatchpointDelete : public CommandObjectParsed {
 
   class CommandOptions : public Options {
   public:
-    CommandOptions() : Options(), m_force(false) {}
+    CommandOptions() : Options() {}
 
     ~CommandOptions() override = default;
 
@@ -495,7 +491,7 @@ class CommandObjectWatchpointDelete : public CommandObjectParsed {
     }
 
     // Instance variables to hold the values for command options.
-    bool m_force;
+    bool m_force = false;
   };
 
 protected:
@@ -593,7 +589,7 @@ class CommandObjectWatchpointIgnore : public CommandObjectParsed {
 
   class CommandOptions : public Options {
   public:
-    CommandOptions() : Options(), m_ignore_count(0) {}
+    CommandOptions() : Options() {}
 
     ~CommandOptions() override = default;
 
@@ -625,7 +621,7 @@ class CommandObjectWatchpointIgnore : public CommandObjectParsed {
 
     // Instance variables to hold the values for command options.
 
-    uint32_t m_ignore_count;
+    uint32_t m_ignore_count = 0;
   };
 
 protected:
@@ -721,7 +717,7 @@ class CommandObjectWatchpointModify : public CommandObjectParsed {
 
   class CommandOptions : public Options {
   public:
-    CommandOptions() : Options(), m_condition(), m_condition_passed(false) {}
+    CommandOptions() : Options(), m_condition() {}
 
     ~CommandOptions() override = default;
 
@@ -754,7 +750,7 @@ class CommandObjectWatchpointModify : public CommandObjectParsed {
     // Instance variables to hold the values for command options.
 
     std::string m_condition;
-    bool m_condition_passed;
+    bool m_condition_passed = false;
   };
 
 protected:
diff --git a/lldb/source/Commands/CommandObjectWatchpointCommand.cpp b/lldb/source/Commands/CommandObjectWatchpointCommand.cpp
index f22687ff4bd87..432ba447a41b2 100644
--- a/lldb/source/Commands/CommandObjectWatchpointCommand.cpp
+++ b/lldb/source/Commands/CommandObjectWatchpointCommand.cpp
@@ -314,10 +314,7 @@ are no syntax errors may indicate that a function was declared but never called.
 
   class CommandOptions : public Options {
   public:
-    CommandOptions()
-        : Options(), m_use_commands(false), m_use_script_language(false),
-          m_script_language(eScriptLanguageNone), m_use_one_liner(false),
-          m_one_liner(), m_function_name() {}
+    CommandOptions() : Options(), m_one_liner(), m_function_name() {}
 
     ~CommandOptions() override = default;
 
@@ -387,12 +384,12 @@ are no syntax errors may indicate that a function was declared but never called.
 
     // Instance variables to hold the values for command options.
 
-    bool m_use_commands;
-    bool m_use_script_language;
-    lldb::ScriptLanguage m_script_language;
+    bool m_use_commands = false;
+    bool m_use_script_language = false;
+    lldb::ScriptLanguage m_script_language = eScriptLanguageNone;
 
     // Instance variables to hold the values for one_liner options.
-    bool m_use_one_liner;
+    bool m_use_one_liner = false;
     std::string m_one_liner;
     bool m_stop_on_error;
     std::string m_function_name;
diff --git a/lldb/source/Core/AddressRange.cpp b/lldb/source/Core/AddressRange.cpp
index 7f3162a9f53d8..f55e17251887f 100644
--- a/lldb/source/Core/AddressRange.cpp
+++ b/lldb/source/Core/AddressRange.cpp
@@ -28,7 +28,7 @@ class SectionList;
 using namespace lldb;
 using namespace lldb_private;
 
-AddressRange::AddressRange() : m_base_addr(), m_byte_size(0) {}
+AddressRange::AddressRange() : m_base_addr() {}
 
 AddressRange::AddressRange(addr_t file_addr, addr_t byte_size,
                            const SectionList *section_list)
diff --git a/lldb/source/Core/IOHandlerCursesGUI.cpp b/lldb/source/Core/IOHandlerCursesGUI.cpp
index 112c257a62fff..4778cde4fbb53 100644
--- a/lldb/source/Core/IOHandlerCursesGUI.cpp
+++ b/lldb/source/Core/IOHandlerCursesGUI.cpp
@@ -2219,9 +2219,7 @@ class ThreadsTreeDelegate : public TreeDelegate {
 
 class ValueObjectListDelegate : public WindowDelegate {
 public:
-  ValueObjectListDelegate()
-      : m_rows(), m_selected_row(nullptr), m_selected_row_idx(0),
-        m_first_visible_row(0), m_num_rows(0), m_max_x(0), m_max_y(0) {}
+  ValueObjectListDelegate() : m_rows() {}
 
   ValueObjectListDelegate(ValueObjectList &valobj_list)
       : m_rows(), m_selected_row(nullptr), m_selected_row_idx(0),
@@ -2409,14 +2407,14 @@ class ValueObjectListDelegate : public WindowDelegate {
 
 protected:
   std::vector<Row> m_rows;
-  Row *m_selected_row;
-  uint32_t m_selected_row_idx;
-  uint32_t m_first_visible_row;
-  uint32_t m_num_rows;
+  Row *m_selected_row = nullptr;
+  uint32_t m_selected_row_idx = 0;
+  uint32_t m_first_visible_row = 0;
+  uint32_t m_num_rows = 0;
   int m_min_x;
   int m_min_y;
-  int m_max_x;
-  int m_max_y;
+  int m_max_x = 0;
+  int m_max_y = 0;
 
   static Format FormatForChar(int c) {
     switch (c) {
diff --git a/lldb/source/Core/Module.cpp b/lldb/source/Core/Module.cpp
index 64193b57b095f..2e8163af12c46 100644
--- a/lldb/source/Core/Module.cpp
+++ b/lldb/source/Core/Module.cpp
@@ -257,9 +257,7 @@ Module::Module(const FileSpec &file_spec, const ArchSpec &arch,
               m_object_name.IsEmpty() ? "" : ")");
 }
 
-Module::Module()
-    : m_object_offset(0), m_file_has_changed(false),
-      m_first_file_changed_log(false) {
+Module::Module() : m_file_has_changed(false), m_first_file_changed_log(false) {
   std::lock_guard<std::recursive_mutex> guard(
       GetAllocationModuleCollectionMutex());
   GetModuleCollection().push_back(this);
diff --git a/lldb/source/Core/ModuleList.cpp b/lldb/source/Core/ModuleList.cpp
index 98f6ae2c62b0d..56bc4c72d8e9c 100644
--- a/lldb/source/Core/ModuleList.cpp
+++ b/lldb/source/Core/ModuleList.cpp
@@ -132,8 +132,7 @@ PathMappingList ModuleListProperties::GetSymlinkMappings() const {
   return m_symlink_paths;
 }
 
-ModuleList::ModuleList()
-    : m_modules(), m_modules_mutex(), m_notifier(nullptr) {}
+ModuleList::ModuleList() : m_modules(), m_modules_mutex() {}
 
 ModuleList::ModuleList(const ModuleList &rhs)
     : m_modules(), m_modules_mutex(), m_notifier(nullptr) {
diff --git a/lldb/source/Core/PluginManager.cpp b/lldb/source/Core/PluginManager.cpp
index a224ba173677b..cb62e4e15b4eb 100644
--- a/lldb/source/Core/PluginManager.cpp
+++ b/lldb/source/Core/PluginManager.cpp
@@ -38,11 +38,11 @@ typedef bool (*PluginInitCallback)();
 typedef void (*PluginTermCallback)();
 
 struct PluginInfo {
-  PluginInfo() : plugin_init_callback(nullptr), plugin_term_callback(nullptr) {}
+  PluginInfo() {}
 
   llvm::sys::DynamicLibrary library;
-  PluginInitCallback plugin_init_callback;
-  PluginTermCallback plugin_term_callback;
+  PluginInitCallback plugin_init_callback = nullptr;
+  PluginTermCallback plugin_term_callback = nullptr;
 };
 
 typedef std::map<FileSpec, PluginInfo> PluginTerminateMap;
diff --git a/lldb/source/Core/Value.cpp b/lldb/source/Core/Value.cpp
index 6ce01d893c640..fb57c0fedf047 100644
--- a/lldb/source/Core/Value.cpp
+++ b/lldb/source/Core/Value.cpp
@@ -38,10 +38,7 @@
 using namespace lldb;
 using namespace lldb_private;
 
-Value::Value()
-    : m_value(), m_compiler_type(), m_context(nullptr),
-      m_value_type(ValueType::Scalar), m_context_type(ContextType::Invalid),
-      m_data_buffer() {}
+Value::Value() : m_value(), m_compiler_type(), m_data_buffer() {}
 
 Value::Value(const Scalar &scalar)
     : m_value(scalar), m_compiler_type(), m_context(nullptr),
diff --git a/lldb/source/Core/ValueObject.cpp b/lldb/source/Core/ValueObject.cpp
index 047fa9941723d..bbcce0dbf20a2 100644
--- a/lldb/source/Core/ValueObject.cpp
+++ b/lldb/source/Core/ValueObject.cpp
@@ -2796,8 +2796,7 @@ ValueObjectSP ValueObject::CastPointerType(const char *name, TypeSP &type_sp) {
   return valobj_sp;
 }
 
-ValueObject::EvaluationPoint::EvaluationPoint()
-    : m_mod_id(), m_exe_ctx_ref(), m_needs_update(true) {}
+ValueObject::EvaluationPoint::EvaluationPoint() : m_mod_id(), m_exe_ctx_ref() {}
 
 ValueObject::EvaluationPoint::EvaluationPoint(ExecutionContextScope *exe_scope,
                                               bool use_selected)
diff --git a/lldb/source/DataFormatters/TypeFormat.cpp b/lldb/source/DataFormatters/TypeFormat.cpp
index 82c8b645ec845..9078a6f48f842 100644
--- a/lldb/source/DataFormatters/TypeFormat.cpp
+++ b/lldb/source/DataFormatters/TypeFormat.cpp
@@ -27,8 +27,7 @@
 using namespace lldb;
 using namespace lldb_private;
 
-TypeFormatImpl::TypeFormatImpl(const Flags &flags)
-    : m_flags(flags), m_my_revision(0) {}
+TypeFormatImpl::TypeFormatImpl(const Flags &flags) : m_flags(flags) {}
 
 TypeFormatImpl::~TypeFormatImpl() {}
 
diff --git a/lldb/source/DataFormatters/TypeSummary.cpp b/lldb/source/DataFormatters/TypeSummary.cpp
index 5d4fe2e467f85..341bbc147448e 100644
--- a/lldb/source/DataFormatters/TypeSummary.cpp
+++ b/lldb/source/DataFormatters/TypeSummary.cpp
@@ -26,8 +26,7 @@
 using namespace lldb;
 using namespace lldb_private;
 
-TypeSummaryOptions::TypeSummaryOptions()
-    : m_lang(eLanguageTypeUnknown), m_capping(eTypeSummaryCapped) {}
+TypeSummaryOptions::TypeSummaryOptions() {}
 
 lldb::LanguageType TypeSummaryOptions::GetLanguage() const { return m_lang; }
 
diff --git a/lldb/source/Expression/DWARFExpression.cpp b/lldb/source/Expression/DWARFExpression.cpp
index 75bad047e095f..fd26071b9a3b9 100644
--- a/lldb/source/Expression/DWARFExpression.cpp
+++ b/lldb/source/Expression/DWARFExpression.cpp
@@ -55,9 +55,7 @@ ReadAddressFromDebugAddrSection(const DWARFUnit *dwarf_cu,
 }
 
 // DWARFExpression constructor
-DWARFExpression::DWARFExpression()
-    : m_module_wp(), m_data(), m_dwarf_cu(nullptr),
-      m_reg_kind(eRegisterKindDWARF) {}
+DWARFExpression::DWARFExpression() : m_module_wp(), m_data() {}
 
 DWARFExpression::DWARFExpression(lldb::ModuleSP module_sp,
                                  const DataExtractor &data,
diff --git a/lldb/source/Host/common/FileAction.cpp b/lldb/source/Host/common/FileAction.cpp
index 8b4e7f4c22083..e399c7ec47cd5 100644
--- a/lldb/source/Host/common/FileAction.cpp
+++ b/lldb/source/Host/common/FileAction.cpp
@@ -16,8 +16,7 @@ using namespace lldb_private;
 
 // FileAction member functions
 
-FileAction::FileAction()
-    : m_action(eFileActionNone), m_fd(-1), m_arg(-1), m_file_spec() {}
+FileAction::FileAction() : m_file_spec() {}
 
 void FileAction::Clear() {
   m_action = eFileActionNone;
diff --git a/lldb/source/Host/common/Host.cpp b/lldb/source/Host/common/Host.cpp
index ad7743c92e715..d14ebe99fd155 100644
--- a/lldb/source/Host/common/Host.cpp
+++ b/lldb/source/Host/common/Host.cpp
@@ -442,14 +442,12 @@ bool Host::FindProcessThreads(const lldb::pid_t pid, TidMap &tids_to_attach) {
 #endif
 
 struct ShellInfo {
-  ShellInfo()
-      : process_reaped(false), pid(LLDB_INVALID_PROCESS_ID), signo(-1),
-        status(-1) {}
+  ShellInfo() : process_reaped(false) {}
 
   lldb_private::Predicate<bool> process_reaped;
-  lldb::pid_t pid;
-  int signo;
-  int status;
+  lldb::pid_t pid = LLDB_INVALID_PROCESS_ID;
+  int signo = -1;
+  int status = -1;
 };
 
 static bool
diff --git a/lldb/source/Host/common/HostNativeThreadBase.cpp b/lldb/source/Host/common/HostNativeThreadBase.cpp
index a79431f61d884..331b2671e88c7 100644
--- a/lldb/source/Host/common/HostNativeThreadBase.cpp
+++ b/lldb/source/Host/common/HostNativeThreadBase.cpp
@@ -18,7 +18,7 @@ using namespace lldb;
 using namespace lldb_private;
 
 HostNativeThreadBase::HostNativeThreadBase()
-    : m_thread(LLDB_INVALID_HOST_THREAD), m_result(0) {}
+    : m_thread(LLDB_INVALID_HOST_THREAD) {}
 
 HostNativeThreadBase::HostNativeThreadBase(thread_t thread)
     : m_thread(thread), m_result(0) {}
diff --git a/lldb/source/Host/common/ProcessLaunchInfo.cpp b/lldb/source/Host/common/ProcessLaunchInfo.cpp
index 8becd5aadecab..8d281b80e8f0b 100644
--- a/lldb/source/Host/common/ProcessLaunchInfo.cpp
+++ b/lldb/source/Host/common/ProcessLaunchInfo.cpp
@@ -30,10 +30,9 @@ using namespace lldb_private;
 
 ProcessLaunchInfo::ProcessLaunchInfo()
     : ProcessInfo(), m_working_dir(), m_plugin_name(), m_flags(0),
-      m_file_actions(), m_pty(new PseudoTerminal), m_resume_count(0),
-      m_monitor_callback(nullptr), m_monitor_callback_baton(nullptr),
-      m_monitor_signals(false), m_listener_sp(), m_hijack_listener_sp(),
-      m_scripted_process_class_name(), m_scripted_process_dictionary_sp() {}
+      m_file_actions(), m_pty(new PseudoTerminal), m_monitor_callback(nullptr),
+      m_listener_sp(), m_hijack_listener_sp(), m_scripted_process_class_name(),
+      m_scripted_process_dictionary_sp() {}
 
 ProcessLaunchInfo::ProcessLaunchInfo(const FileSpec &stdin_file_spec,
                                      const FileSpec &stdout_file_spec,
diff --git a/lldb/source/Host/common/ProcessRunLock.cpp b/lldb/source/Host/common/ProcessRunLock.cpp
index 3b6f033d33ab6..aee15779d9199 100644
--- a/lldb/source/Host/common/ProcessRunLock.cpp
+++ b/lldb/source/Host/common/ProcessRunLock.cpp
@@ -11,7 +11,7 @@
 
 namespace lldb_private {
 
-ProcessRunLock::ProcessRunLock() : m_running(false) {
+ProcessRunLock::ProcessRunLock() {
   int err = ::pthread_rwlock_init(&m_rwlock, nullptr);
   (void)err;
 }
diff --git a/lldb/source/Host/common/PseudoTerminal.cpp b/lldb/source/Host/common/PseudoTerminal.cpp
index ce062afb9c5ab..6533d659ce317 100644
--- a/lldb/source/Host/common/PseudoTerminal.cpp
+++ b/lldb/source/Host/common/PseudoTerminal.cpp
@@ -29,8 +29,7 @@ int posix_openpt(int flags);
 using namespace lldb_private;
 
 // PseudoTerminal constructor
-PseudoTerminal::PseudoTerminal()
-    : m_primary_fd(invalid_fd), m_secondary_fd(invalid_fd) {}
+PseudoTerminal::PseudoTerminal() {}
 
 // Destructor
 //
diff --git a/lldb/source/Host/common/Terminal.cpp b/lldb/source/Host/common/Terminal.cpp
index c9999bd7f8351..e59b2198f5061 100644
--- a/lldb/source/Host/common/Terminal.cpp
+++ b/lldb/source/Host/common/Terminal.cpp
@@ -83,11 +83,12 @@ bool Terminal::SetCanonical(bool enabled) {
 
 // Default constructor
 TerminalState::TerminalState()
-    : m_tty(), m_tflags(-1),
+    : m_tty()
 #if LLDB_ENABLE_TERMIOS
-      m_termios_up(),
+      ,
+      m_termios_up()
 #endif
-      m_process_group(-1) {
+{
 }
 
 // Destructor
@@ -189,7 +190,7 @@ bool TerminalState::ProcessGroupIsValid() const {
 }
 
 // Constructor
-TerminalStateSwitcher::TerminalStateSwitcher() : m_currentState(UINT32_MAX) {}
+TerminalStateSwitcher::TerminalStateSwitcher() {}
 
 // Destructor
 TerminalStateSwitcher::~TerminalStateSwitcher() {}
diff --git a/lldb/source/Host/common/XML.cpp b/lldb/source/Host/common/XML.cpp
index 456c879b0148e..dd40f1acc3fb2 100644
--- a/lldb/source/Host/common/XML.cpp
+++ b/lldb/source/Host/common/XML.cpp
@@ -17,7 +17,7 @@ using namespace lldb_private;
 
 #pragma mark-- XMLDocument
 
-XMLDocument::XMLDocument() : m_document(nullptr) {}
+XMLDocument::XMLDocument() {}
 
 XMLDocument::~XMLDocument() { Clear(); }
 
@@ -91,7 +91,7 @@ bool XMLDocument::XMLEnabled() {
 
 #pragma mark-- XMLNode
 
-XMLNode::XMLNode() : m_node(nullptr) {}
+XMLNode::XMLNode() {}
 
 XMLNode::XMLNode(XMLNodeImpl node) : m_node(node) {}
 
diff --git a/lldb/source/Host/macosx/objcxx/HostThreadMacOSX.mm b/lldb/source/Host/macosx/objcxx/HostThreadMacOSX.mm
index 5c60caa33e6f4..0a1cfa9456843 100644
--- a/lldb/source/Host/macosx/objcxx/HostThreadMacOSX.mm
+++ b/lldb/source/Host/macosx/objcxx/HostThreadMacOSX.mm
@@ -23,9 +23,7 @@
 
 class MacOSXDarwinThread {
 public:
-  MacOSXDarwinThread() : m_pool(nil) {
-    m_pool = [[NSAutoreleasePool alloc] init];
-  }
+  MacOSXDarwinThread() { m_pool = [[NSAutoreleasePool alloc] init]; }
 
   ~MacOSXDarwinThread() {
     if (m_pool) {
@@ -41,7 +39,7 @@ static void PThreadDestructor(void *v) {
   }
 
 protected:
-  NSAutoreleasePool *m_pool;
+  NSAutoreleasePool *m_pool = nil;
 
 private:
   MacOSXDarwinThread(const MacOSXDarwinThread &) = delete;
diff --git a/lldb/source/Host/posix/ConnectionFileDescriptorPosix.cpp b/lldb/source/Host/posix/ConnectionFileDescriptorPosix.cpp
index 548a3767e3173..2f4cc960f02d0 100644
--- a/lldb/source/Host/posix/ConnectionFileDescriptorPosix.cpp
+++ b/lldb/source/Host/posix/ConnectionFileDescriptorPosix.cpp
@@ -76,7 +76,7 @@ llvm::Optional<llvm::StringRef> GetURLAddress(llvm::StringRef url,
 
 ConnectionFileDescriptor::ConnectionFileDescriptor(bool child_processes_inherit)
     : Connection(), m_pipe(), m_mutex(), m_shutting_down(false),
-      m_waiting_for_accept(false),
+
       m_child_processes_inherit(child_processes_inherit) {
   Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_CONNECTION |
                                                   LIBLLDB_LOG_OBJECT));
diff --git a/lldb/source/Initialization/SystemLifetimeManager.cpp b/lldb/source/Initialization/SystemLifetimeManager.cpp
index 00ab3198c363c..f9de41a675356 100644
--- a/lldb/source/Initialization/SystemLifetimeManager.cpp
+++ b/lldb/source/Initialization/SystemLifetimeManager.cpp
@@ -15,8 +15,7 @@
 
 using namespace lldb_private;
 
-SystemLifetimeManager::SystemLifetimeManager()
-    : m_mutex(), m_initialized(false) {}
+SystemLifetimeManager::SystemLifetimeManager() : m_mutex() {}
 
 SystemLifetimeManager::~SystemLifetimeManager() {
   assert(!m_initialized &&
diff --git a/lldb/source/Interpreter/OptionValueFileColonLine.cpp b/lldb/source/Interpreter/OptionValueFileColonLine.cpp
index 6f954e99f9b00..e1d673ed213ba 100644
--- a/lldb/source/Interpreter/OptionValueFileColonLine.cpp
+++ b/lldb/source/Interpreter/OptionValueFileColonLine.cpp
@@ -22,9 +22,8 @@ using namespace lldb_private;
 // only usefully complete in the file name part of it so it should be good
 // enough.
 OptionValueFileColonLine::OptionValueFileColonLine()
-    : m_line_number(LLDB_INVALID_LINE_NUMBER),
-      m_column_number(LLDB_INVALID_COLUMN_NUMBER),
-      m_completion_mask(CommandCompletions::eSourceFileCompletion) {}
+
+{}
 
 OptionValueFileColonLine::OptionValueFileColonLine(llvm::StringRef input)
     : m_line_number(LLDB_INVALID_LINE_NUMBER),
diff --git a/lldb/source/Interpreter/OptionValueFileSpec.cpp b/lldb/source/Interpreter/OptionValueFileSpec.cpp
index 9f80cc86db506..3987a36b1b65f 100644
--- a/lldb/source/Interpreter/OptionValueFileSpec.cpp
+++ b/lldb/source/Interpreter/OptionValueFileSpec.cpp
@@ -18,9 +18,7 @@
 using namespace lldb;
 using namespace lldb_private;
 
-OptionValueFileSpec::OptionValueFileSpec(bool resolve)
-    : m_completion_mask(CommandCompletions::eDiskFileCompletion),
-      m_resolve(resolve) {}
+OptionValueFileSpec::OptionValueFileSpec(bool resolve) : m_resolve(resolve) {}
 
 OptionValueFileSpec::OptionValueFileSpec(const FileSpec &value, bool resolve)
     : m_current_value(value), m_default_value(value),
diff --git a/lldb/source/Plugins/DynamicLoader/Darwin-Kernel/DynamicLoaderDarwinKernel.h b/lldb/source/Plugins/DynamicLoader/Darwin-Kernel/DynamicLoaderDarwinKernel.h
index 8659cd575bc31..1fa78bf77f37f 100644
--- a/lldb/source/Plugins/DynamicLoader/Darwin-Kernel/DynamicLoaderDarwinKernel.h
+++ b/lldb/source/Plugins/DynamicLoader/Darwin-Kernel/DynamicLoaderDarwinKernel.h
@@ -125,11 +125,7 @@ class DynamicLoaderDarwinKernel : public lldb_private::DynamicLoader {
 
   class KextImageInfo {
   public:
-    KextImageInfo()
-        : m_name(), m_module_sp(), m_memory_module_sp(),
-          m_load_process_stop_id(UINT32_MAX), m_uuid(),
-          m_load_address(LLDB_INVALID_ADDRESS), m_size(0),
-          m_kernel_image(false) {}
+    KextImageInfo() : m_name(), m_module_sp(), m_memory_module_sp(), m_uuid() {}
 
     void Clear() {
       m_load_address = LLDB_INVALID_ADDRESS;
@@ -201,24 +197,26 @@ class DynamicLoaderDarwinKernel : public lldb_private::DynamicLoader {
     std::string m_name;
     lldb::ModuleSP m_module_sp;
     lldb::ModuleSP m_memory_module_sp;
-    uint32_t m_load_process_stop_id; // the stop-id when this module was added
-                                     // to the Target
+    uint32_t m_load_process_stop_id =
+        UINT32_MAX; // the stop-id when this module was added
+                    // to the Target
     lldb_private::UUID
         m_uuid; // UUID for this dylib if it has one, else all zeros
-    lldb::addr_t m_load_address;
-    uint64_t m_size;
-    bool m_kernel_image; // true if this is the kernel, false if this is a kext
+    lldb::addr_t m_load_address = LLDB_INVALID_ADDRESS;
+    uint64_t m_size = 0;
+    bool m_kernel_image =
+        false; // true if this is the kernel, false if this is a kext
   };
 
   struct OSKextLoadedKextSummaryHeader {
-    uint32_t version;
-    uint32_t entry_size;
-    uint32_t entry_count;
-    lldb::addr_t image_infos_addr;
+    uint32_t version = 0;
+    uint32_t entry_size = 0;
+    uint32_t entry_count = 0;
+    lldb::addr_t image_infos_addr = LLDB_INVALID_ADDRESS;
 
     OSKextLoadedKextSummaryHeader()
-        : version(0), entry_size(0), entry_count(0),
-          image_infos_addr(LLDB_INVALID_ADDRESS) {}
+
+    {}
 
     uint32_t GetSize() {
       switch (version) {
diff --git a/lldb/source/Plugins/DynamicLoader/Hexagon-DYLD/HexagonDYLDRendezvous.h b/lldb/source/Plugins/DynamicLoader/Hexagon-DYLD/HexagonDYLDRendezvous.h
index 5707f8858f6c9..01542bcc4b53e 100644
--- a/lldb/source/Plugins/DynamicLoader/Hexagon-DYLD/HexagonDYLDRendezvous.h
+++ b/lldb/source/Plugins/DynamicLoader/Hexagon-DYLD/HexagonDYLDRendezvous.h
@@ -35,15 +35,13 @@ class HexagonDYLDRendezvous {
   // the layout of this struct is not binary compatible, it is simply large
   // enough to hold the information on both 32 and 64 bit platforms.
   struct Rendezvous {
-    uint64_t version;
-    lldb::addr_t map_addr;
-    lldb::addr_t brk;
-    uint64_t state;
-    lldb::addr_t ldbase;
-
-    Rendezvous()
-        : version(0), map_addr(LLDB_INVALID_ADDRESS), brk(LLDB_INVALID_ADDRESS),
-          state(0), ldbase(0) {}
+    uint64_t version = 0;
+    lldb::addr_t map_addr = LLDB_INVALID_ADDRESS;
+    lldb::addr_t brk = LLDB_INVALID_ADDRESS;
+    uint64_t state = 0;
+    lldb::addr_t ldbase = 0;
+
+    Rendezvous() {}
   };
 
 public:
diff --git a/lldb/source/Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderDarwin.h b/lldb/source/Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderDarwin.h
index 4c9a27f085377..1b705e9444680 100644
--- a/lldb/source/Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderDarwin.h
+++ b/lldb/source/Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderDarwin.h
@@ -73,19 +73,17 @@ class DynamicLoaderDarwin : public lldb_private::DynamicLoader {
 
   class Segment {
   public:
-    Segment()
-        : name(), vmaddr(LLDB_INVALID_ADDRESS), vmsize(0), fileoff(0),
-          filesize(0), maxprot(0), initprot(0), nsects(0), flags(0) {}
+    Segment() : name() {}
 
     lldb_private::ConstString name;
-    lldb::addr_t vmaddr;
-    lldb::addr_t vmsize;
-    lldb::addr_t fileoff;
-    lldb::addr_t filesize;
-    uint32_t maxprot;
-    uint32_t initprot;
-    uint32_t nsects;
-    uint32_t flags;
+    lldb::addr_t vmaddr = LLDB_INVALID_ADDRESS;
+    lldb::addr_t vmsize = 0;
+    lldb::addr_t fileoff = 0;
+    lldb::addr_t filesize = 0;
+    uint32_t maxprot = 0;
+    uint32_t initprot = 0;
+    uint32_t nsects = 0;
+    uint32_t flags = 0;
 
     bool operator==(const Segment &rhs) const {
       return name == rhs.name && vmaddr == rhs.vmaddr && vmsize == rhs.vmsize;
diff --git a/lldb/source/Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderMacOSXDYLD.h b/lldb/source/Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderMacOSXDYLD.h
index b3cb3e50fa30f..190898c01091f 100644
--- a/lldb/source/Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderMacOSXDYLD.h
+++ b/lldb/source/Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderMacOSXDYLD.h
@@ -98,20 +98,17 @@ class DynamicLoaderMacOSXDYLD : public lldb_private::DynamicLoaderDarwin {
                              lldb_private::FileSpec *lc_id_dylinker);
 
   struct DYLDAllImageInfos {
-    uint32_t version;
-    uint32_t dylib_info_count;            // Version >= 1
-    lldb::addr_t dylib_info_addr;         // Version >= 1
-    lldb::addr_t notification;            // Version >= 1
-    bool processDetachedFromSharedRegion; // Version >= 1
-    bool libSystemInitialized;            // Version >= 2
-    lldb::addr_t dyldImageLoadAddress;    // Version >= 2
+    uint32_t version = 0;
+    uint32_t dylib_info_count = 0;                            // Version >= 1
+    lldb::addr_t dylib_info_addr = LLDB_INVALID_ADDRESS;      // Version >= 1
+    lldb::addr_t notification = LLDB_INVALID_ADDRESS;         // Version >= 1
+    bool processDetachedFromSharedRegion = false;             // Version >= 1
+    bool libSystemInitialized = false;                        // Version >= 2
+    lldb::addr_t dyldImageLoadAddress = LLDB_INVALID_ADDRESS; // Version >= 2
 
     DYLDAllImageInfos()
-        : version(0), dylib_info_count(0),
-          dylib_info_addr(LLDB_INVALID_ADDRESS),
-          notification(LLDB_INVALID_ADDRESS),
-          processDetachedFromSharedRegion(false), libSystemInitialized(false),
-          dyldImageLoadAddress(LLDB_INVALID_ADDRESS) {}
+
+    {}
 
     void Clear() {
       version = 0;
diff --git a/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DYLDRendezvous.h b/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DYLDRendezvous.h
index 3e88d88f407a0..3cc58dd805b8e 100644
--- a/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DYLDRendezvous.h
+++ b/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DYLDRendezvous.h
@@ -38,13 +38,13 @@ class DYLDRendezvous {
   // the layout of this struct is not binary compatible, it is simply large
   // enough to hold the information on both 32 and 64 bit platforms.
   struct Rendezvous {
-    uint64_t version;
-    lldb::addr_t map_addr;
-    lldb::addr_t brk;
-    uint64_t state;
-    lldb::addr_t ldbase;
+    uint64_t version = 0;
+    lldb::addr_t map_addr = 0;
+    lldb::addr_t brk = 0;
+    uint64_t state = 0;
+    lldb::addr_t ldbase = 0;
 
-    Rendezvous() : version(0), map_addr(0), brk(0), state(0), ldbase(0) {}
+    Rendezvous() {}
   };
 
 public:
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangASTImporter.h b/lldb/source/Plugins/ExpressionParser/Clang/ClangASTImporter.h
index 274b1215eb21f..df2096aa50b0e 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangASTImporter.h
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangASTImporter.h
@@ -216,7 +216,7 @@ class ClangASTImporter {
   void ForgetSource(clang::ASTContext *dst_ctx, clang::ASTContext *src_ctx);
 
   struct DeclOrigin {
-    DeclOrigin() : ctx(nullptr), decl(nullptr) {}
+    DeclOrigin() {}
 
     DeclOrigin(clang::ASTContext *_ctx, clang::Decl *_decl)
         : ctx(_ctx), decl(_decl) {
@@ -236,8 +236,8 @@ class ClangASTImporter {
 
     bool Valid() const { return (ctx != nullptr || decl != nullptr); }
 
-    clang::ASTContext *ctx;
-    clang::Decl *decl;
+    clang::ASTContext *ctx = nullptr;
+    clang::Decl *decl = nullptr;
   };
 
   /// Listener interface used by the ASTImporterDelegate to inform other code
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.h b/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.h
index e3d2f449683d9..1af5df95821e5 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.h
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.h
@@ -248,10 +248,10 @@ class ClangExpressionDeclMap : public ClangASTSource {
                                 lldb::SymbolType symbol_type);
 
   struct TargetInfo {
-    lldb::ByteOrder byte_order;
-    size_t address_byte_size;
+    lldb::ByteOrder byte_order = lldb::eByteOrderInvalid;
+    size_t address_byte_size = 0;
 
-    TargetInfo() : byte_order(lldb::eByteOrderInvalid), address_byte_size(0) {}
+    TargetInfo() {}
 
     bool IsValid() {
       return (byte_order != lldb::eByteOrderInvalid && address_byte_size != 0);
@@ -353,16 +353,15 @@ class ClangExpressionDeclMap : public ClangASTSource {
   /// The following values contain layout information for the materialized
   /// struct, but are not specific to a single materialization
   struct StructVars {
-    StructVars()
-        : m_struct_alignment(0), m_struct_size(0), m_struct_laid_out(false),
-          m_result_name(), m_object_pointer_type(nullptr, nullptr) {}
-
-    lldb::offset_t
-        m_struct_alignment; ///< The alignment of the struct in bytes.
-    size_t m_struct_size;   ///< The size of the struct in bytes.
-    bool m_struct_laid_out; ///< True if the struct has been laid out and the
-                            ///layout is valid (that is, no new fields have been
-                            ///added since).
+    StructVars() : m_result_name(), m_object_pointer_type(nullptr, nullptr) {}
+
+    lldb::offset_t m_struct_alignment =
+        0;                    ///< The alignment of the struct in bytes.
+    size_t m_struct_size = 0; ///< The size of the struct in bytes.
+    bool m_struct_laid_out =
+        false; ///< True if the struct has been laid out and the
+               /// layout is valid (that is, no new fields have been
+               /// added since).
     ConstString
         m_result_name; ///< The name of the result variable ($1, for example)
     TypeFromUser m_object_pointer_type; ///< The type of the "this" variable, if
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionVariable.h b/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionVariable.h
index 6bae52edd5a26..d8a77b94ebdc6 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionVariable.h
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionVariable.h
@@ -116,19 +116,19 @@ class ClangExpressionVariable : public ExpressionVariable {
   /// The following values should not live beyond parsing
   class ParserVars {
   public:
-    ParserVars()
-        : m_named_decl(nullptr), m_llvm_value(nullptr),
-          m_lldb_value(), m_lldb_var(), m_lldb_sym(nullptr) {}
-
-    const clang::NamedDecl
-        *m_named_decl;         ///< The Decl corresponding to this variable
-    llvm::Value *m_llvm_value; ///< The IR value corresponding to this variable;
-                               ///usually a GlobalValue
+    ParserVars() : m_lldb_value(), m_lldb_var() {}
+
+    const clang::NamedDecl *m_named_decl =
+        nullptr; ///< The Decl corresponding to this variable
+    llvm::Value *m_llvm_value =
+        nullptr; ///< The IR value corresponding to this variable;
+                 /// usually a GlobalValue
     lldb_private::Value
         m_lldb_value;            ///< The value found in LLDB for this variable
     lldb::VariableSP m_lldb_var; ///< The original variable for this variable
-    const lldb_private::Symbol *m_lldb_sym; ///< The original symbol for this
-                                            ///variable, if it was a symbol
+    const lldb_private::Symbol *m_lldb_sym =
+        nullptr; ///< The original symbol for this
+                 /// variable, if it was a symbol
   };
 
 private:
@@ -157,13 +157,13 @@ class ClangExpressionVariable : public ExpressionVariable {
 
   /// The following values are valid if the variable is used by JIT code
   struct JITVars {
-    JITVars() : m_alignment(0), m_size(0), m_offset(0) {}
+    JITVars() {}
 
-    lldb::offset_t
-        m_alignment; ///< The required alignment of the variable, in bytes
-    size_t m_size;   ///< The space required for the variable, in bytes
-    lldb::offset_t
-        m_offset; ///< The offset of the variable in the struct, in bytes
+    lldb::offset_t m_alignment =
+        0;             ///< The required alignment of the variable, in bytes
+    size_t m_size = 0; ///< The space required for the variable, in bytes
+    lldb::offset_t m_offset =
+        0; ///< The offset of the variable in the struct, in bytes
   };
 
 private:
diff --git a/lldb/source/Plugins/Instruction/ARM/EmulateInstructionARM.h b/lldb/source/Plugins/Instruction/ARM/EmulateInstructionARM.h
index d15d80c97e38f..5c80bbe0fea92 100644
--- a/lldb/source/Plugins/Instruction/ARM/EmulateInstructionARM.h
+++ b/lldb/source/Plugins/Instruction/ARM/EmulateInstructionARM.h
@@ -19,7 +19,7 @@ namespace lldb_private {
 // ITSession - Keep track of the IT Block progression.
 class ITSession {
 public:
-  ITSession() : ITCounter(0), ITState(0) {}
+  ITSession() {}
   ~ITSession() {}
 
   // InitIT - Initializes ITCounter/ITState.
@@ -39,8 +39,8 @@ class ITSession {
   uint32_t GetCond();
 
 private:
-  uint32_t ITCounter; // Possible values: 0, 1, 2, 3, 4.
-  uint32_t ITState;   // A2.5.2 Consists of IT[7:5] and IT[4:0] initially.
+  uint32_t ITCounter = 0; // Possible values: 0, 1, 2, 3, 4.
+  uint32_t ITState = 0;   // A2.5.2 Consists of IT[7:5] and IT[4:0] initially.
 };
 
 class EmulateInstructionARM : public EmulateInstruction {
diff --git a/lldb/source/Plugins/Instruction/ARM/EmulationStateARM.cpp b/lldb/source/Plugins/Instruction/ARM/EmulationStateARM.cpp
index aef08baa8ae95..cc030670a8c7e 100644
--- a/lldb/source/Plugins/Instruction/ARM/EmulationStateARM.cpp
+++ b/lldb/source/Plugins/Instruction/ARM/EmulationStateARM.cpp
@@ -20,7 +20,7 @@
 using namespace lldb;
 using namespace lldb_private;
 
-EmulationStateARM::EmulationStateARM() : m_gpr(), m_vfp_regs(), m_memory() {
+EmulationStateARM::EmulationStateARM() : m_vfp_regs(), m_memory() {
   ClearPseudoRegisters();
 }
 
diff --git a/lldb/source/Plugins/Instruction/ARM/EmulationStateARM.h b/lldb/source/Plugins/Instruction/ARM/EmulationStateARM.h
index 955c7c6420589..28bc5d98649da 100644
--- a/lldb/source/Plugins/Instruction/ARM/EmulationStateARM.h
+++ b/lldb/source/Plugins/Instruction/ARM/EmulationStateARM.h
@@ -61,7 +61,7 @@ class EmulationStateARM {
                       const lldb_private::RegisterValue &reg_value);
 
 private:
-  uint32_t m_gpr[17];
+  uint32_t m_gpr[17] = {0};
   struct _sd_regs {
     uint32_t s_regs[32]; // sregs 0 - 31 & dregs 0 - 15
 
diff --git a/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.h b/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.h
index d2a239da9b08a..9163be4807ec2 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.h
+++ b/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.h
@@ -28,8 +28,7 @@ class CPlusPlusLanguage : public Language {
   class MethodName {
   public:
     MethodName()
-        : m_full(), m_basename(), m_context(), m_arguments(), m_qualifiers(),
-          m_parsed(false), m_parse_error(false) {}
+        : m_full(), m_basename(), m_context(), m_arguments(), m_qualifiers() {}
 
     MethodName(ConstString s)
         : m_full(s), m_basename(), m_context(), m_arguments(), m_qualifiers(),
@@ -68,8 +67,8 @@ class CPlusPlusLanguage : public Language {
     llvm::StringRef m_context;    // Decl context: "lldb::SBTarget"
     llvm::StringRef m_arguments;  // Arguments:    "(unsigned int)"
     llvm::StringRef m_qualifiers; // Qualifiers:   "const"
-    bool m_parsed;
-    bool m_parse_error;
+    bool m_parsed = false;
+    bool m_parse_error = false;
   };
 
   CPlusPlusLanguage() = default;
diff --git a/lldb/source/Plugins/Language/ObjC/NSIndexPath.cpp b/lldb/source/Plugins/Language/ObjC/NSIndexPath.cpp
index a15b0f64954a8..068bca9e7b94b 100644
--- a/lldb/source/Plugins/Language/ObjC/NSIndexPath.cpp
+++ b/lldb/source/Plugins/Language/ObjC/NSIndexPath.cpp
@@ -209,14 +209,13 @@ class NSIndexPathSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
         m_process = nullptr;
       }
 
-      InlinedIndexes()
-          : m_indexes(0), m_count(0), m_ptr_size(0), m_process(nullptr) {}
+      InlinedIndexes() {}
 
     private:
-      uint64_t m_indexes;
-      size_t m_count;
-      uint32_t m_ptr_size;
-      Process *m_process;
+      uint64_t m_indexes = 0;
+      size_t m_count = 0;
+      uint32_t m_ptr_size = 0;
+      Process *m_process = nullptr;
 
       // cfr. Foundation for the details of this code
       size_t _lengthForInlinePayload(uint32_t ptr_size) {
@@ -271,10 +270,10 @@ class NSIndexPathSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
         m_count = 0;
       }
 
-      OutsourcedIndexes() : m_indexes(nullptr), m_count(0) {}
+      OutsourcedIndexes() {}
 
-      ValueObject *m_indexes;
-      size_t m_count;
+      ValueObject *m_indexes = nullptr;
+      size_t m_count = 0;
     };
 
     union {
@@ -288,9 +287,9 @@ class NSIndexPathSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
       m_outsourced.Clear();
     }
 
-    Impl() : m_mode(Mode::Invalid) {}
+    Impl() {}
 
-    Mode m_mode;
+    Mode m_mode = Mode::Invalid;
   } m_impl;
 
   uint32_t m_ptr_size;
diff --git a/lldb/source/Plugins/Language/ObjC/ObjCLanguage.h b/lldb/source/Plugins/Language/ObjC/ObjCLanguage.h
index e2aa53f9047e5..7401e54ea1efc 100644
--- a/lldb/source/Plugins/Language/ObjC/ObjCLanguage.h
+++ b/lldb/source/Plugins/Language/ObjC/ObjCLanguage.h
@@ -27,9 +27,7 @@ class ObjCLanguage : public Language {
   public:
     enum Type { eTypeUnspecified, eTypeClassMethod, eTypeInstanceMethod };
 
-    MethodName()
-        : m_full(), m_class(), m_category(), m_selector(),
-          m_type(eTypeUnspecified), m_category_is_valid(false) {}
+    MethodName() : m_full(), m_class(), m_category(), m_selector() {}
 
     MethodName(const char *name, bool strict)
         : m_full(), m_class(), m_category(), m_selector(),
@@ -81,8 +79,8 @@ class ObjCLanguage : public Language {
         m_class_category;   // Class with category: "NSString(my_additions)"
     ConstString m_category; // Category:    "my_additions"
     ConstString m_selector; // Selector:    "myStringWithCString:"
-    Type m_type;
-    bool m_category_is_valid;
+    Type m_type = eTypeUnspecified;
+    bool m_category_is_valid = false;
   };
 
   ObjCLanguage() = default;
diff --git a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCClassDescriptorV2.cpp b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCClassDescriptorV2.cpp
index bdd5c29db8484..c1082100f2746 100644
--- a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCClassDescriptorV2.cpp
+++ b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCClassDescriptorV2.cpp
@@ -514,8 +514,7 @@ uint64_t ClassDescriptorV2::GetInstanceSize() {
   return 0;
 }
 
-ClassDescriptorV2::iVarsStorage::iVarsStorage()
-    : m_filled(false), m_ivars(), m_mutex() {}
+ClassDescriptorV2::iVarsStorage::iVarsStorage() : m_ivars(), m_mutex() {}
 
 size_t ClassDescriptorV2::iVarsStorage::size() { return m_ivars.size(); }
 
diff --git a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCClassDescriptorV2.h b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCClassDescriptorV2.h
index 1bea314f63fca..16e94f6790841 100644
--- a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCClassDescriptorV2.h
+++ b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCClassDescriptorV2.h
@@ -77,16 +77,14 @@ class ClassDescriptorV2 : public ObjCLanguageRuntime::ClassDescriptor {
   static const uint32_t RW_REALIZED = (1 << 31);
 
   struct objc_class_t {
-    ObjCLanguageRuntime::ObjCISA m_isa; // The class's metaclass.
-    ObjCLanguageRuntime::ObjCISA m_superclass;
-    lldb::addr_t m_cache_ptr;
-    lldb::addr_t m_vtable_ptr;
-    lldb::addr_t m_data_ptr;
-    uint8_t m_flags;
+    ObjCLanguageRuntime::ObjCISA m_isa = 0; // The class's metaclass.
+    ObjCLanguageRuntime::ObjCISA m_superclass = 0;
+    lldb::addr_t m_cache_ptr = 0;
+    lldb::addr_t m_vtable_ptr = 0;
+    lldb::addr_t m_data_ptr = 0;
+    uint8_t m_flags = 0;
 
-    objc_class_t()
-        : m_isa(0), m_superclass(0), m_cache_ptr(0), m_vtable_ptr(0),
-          m_data_ptr(0), m_flags(0) {}
+    objc_class_t() {}
 
     void Clear() {
       m_isa = 0;
@@ -213,7 +211,7 @@ class ClassDescriptorV2 : public ObjCLanguageRuntime::ClassDescriptor {
     void fill(AppleObjCRuntimeV2 &runtime, ClassDescriptorV2 &descriptor);
 
   private:
-    bool m_filled;
+    bool m_filled = false;
     std::vector<iVarDescriptor> m_ivars;
     std::recursive_mutex m_mutex;
   };
diff --git a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV1.h b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV1.h
index 0164f83a06002..5683679a8f127 100644
--- a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV1.h
+++ b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV1.h
@@ -126,8 +126,7 @@ class AppleObjCRuntimeV1 : public AppleObjCRuntime {
 
   class HashTableSignature {
   public:
-    HashTableSignature()
-        : m_count(0), m_num_buckets(0), m_buckets_ptr(LLDB_INVALID_ADDRESS) {}
+    HashTableSignature() {}
 
     bool NeedsUpdate(uint32_t count, uint32_t num_buckets,
                      lldb::addr_t buckets_ptr) {
@@ -143,9 +142,9 @@ class AppleObjCRuntimeV1 : public AppleObjCRuntime {
     }
 
   protected:
-    uint32_t m_count;
-    uint32_t m_num_buckets;
-    lldb::addr_t m_buckets_ptr;
+    uint32_t m_count = 0;
+    uint32_t m_num_buckets = 0;
+    lldb::addr_t m_buckets_ptr = LLDB_INVALID_ADDRESS;
   };
 
   lldb::addr_t GetISAHashTablePointer();
diff --git a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
index ab9cfab850a5b..83f4356c3fb37 100644
--- a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
+++ b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
@@ -1032,11 +1032,7 @@ bool AppleObjCRuntimeV2::IsTaggedPointer(addr_t ptr) {
 
 class RemoteNXMapTable {
 public:
-  RemoteNXMapTable()
-      : m_count(0), m_num_buckets_minus_one(0),
-        m_buckets_ptr(LLDB_INVALID_ADDRESS), m_process(nullptr),
-        m_end_iterator(*this, -1), m_load_addr(LLDB_INVALID_ADDRESS),
-        m_map_pair_size(0), m_invalid_key(0) {}
+  RemoteNXMapTable() : m_end_iterator(*this, -1) {}
 
   void Dump() {
     printf("RemoteNXMapTable.m_load_addr = 0x%" PRIx64 "\n", m_load_addr);
@@ -1210,18 +1206,17 @@ class RemoteNXMapTable {
 
 private:
   // contents of _NXMapTable struct
-  uint32_t m_count;
-  uint32_t m_num_buckets_minus_one;
-  lldb::addr_t m_buckets_ptr;
-  lldb_private::Process *m_process;
+  uint32_t m_count = 0;
+  uint32_t m_num_buckets_minus_one = 0;
+  lldb::addr_t m_buckets_ptr = LLDB_INVALID_ADDRESS;
+  lldb_private::Process *m_process = nullptr;
   const_iterator m_end_iterator;
-  lldb::addr_t m_load_addr;
-  size_t m_map_pair_size;
-  lldb::addr_t m_invalid_key;
+  lldb::addr_t m_load_addr = LLDB_INVALID_ADDRESS;
+  size_t m_map_pair_size = 0;
+  lldb::addr_t m_invalid_key = 0;
 };
 
-AppleObjCRuntimeV2::HashTableSignature::HashTableSignature()
-    : m_count(0), m_num_buckets(0), m_buckets_ptr(0) {}
+AppleObjCRuntimeV2::HashTableSignature::HashTableSignature() {}
 
 void AppleObjCRuntimeV2::HashTableSignature::UpdateSignature(
     const RemoteNXMapTable &hash_table) {
diff --git a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.h b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.h
index 9ed9a6f71b828..2da1670a3a0c0 100644
--- a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.h
+++ b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.h
@@ -116,9 +116,9 @@ class AppleObjCRuntimeV2 : public AppleObjCRuntime {
     void UpdateSignature(const RemoteNXMapTable &hash_table);
 
   protected:
-    uint32_t m_count;
-    uint32_t m_num_buckets;
-    lldb::addr_t m_buckets_ptr;
+    uint32_t m_count = 0;
+    uint32_t m_num_buckets = 0;
+    lldb::addr_t m_buckets_ptr = 0;
   };
 
   class NonPointerISACache {
diff --git a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.h b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.h
index 27aebd8594dfa..3fae5255c8ffb 100644
--- a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.h
+++ b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.h
@@ -76,10 +76,7 @@ class AppleObjCTrampolineHandler {
 
     class VTableRegion {
     public:
-      VTableRegion()
-          : m_valid(false), m_owner(nullptr),
-            m_header_addr(LLDB_INVALID_ADDRESS), m_code_start_addr(0),
-            m_code_end_addr(0), m_next_region(0) {}
+      VTableRegion() {}
 
       VTableRegion(AppleObjCVTables *owner, lldb::addr_t header_addr);
 
@@ -99,13 +96,13 @@ class AppleObjCTrampolineHandler {
 
       void Dump(Stream &s);
 
-      bool m_valid;
-      AppleObjCVTables *m_owner;
-      lldb::addr_t m_header_addr;
-      lldb::addr_t m_code_start_addr;
-      lldb::addr_t m_code_end_addr;
+      bool m_valid = false;
+      AppleObjCVTables *m_owner = nullptr;
+      lldb::addr_t m_header_addr = LLDB_INVALID_ADDRESS;
+      lldb::addr_t m_code_start_addr = 0;
+      lldb::addr_t m_code_end_addr = 0;
       std::vector<VTableDescriptor> m_descriptors;
-      lldb::addr_t m_next_region;
+      lldb::addr_t m_next_region = 0;
     };
 
   public:
diff --git a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTypeEncodingParser.cpp b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTypeEncodingParser.cpp
index b19d3d90d4b72..7b0121503bc40 100644
--- a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTypeEncodingParser.cpp
+++ b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTypeEncodingParser.cpp
@@ -59,7 +59,7 @@ uint32_t AppleObjCTypeEncodingParser::ReadNumber(StringLexer &type) {
 // "{CGRect=\"origin\"{CGPoint=\"x\"d\"y\"d}\"size\"{CGSize=\"width\"d\"height\"d}}"
 
 AppleObjCTypeEncodingParser::StructElement::StructElement()
-    : name(""), type(clang::QualType()), bitfield(0) {}
+    : name(""), type(clang::QualType()) {}
 
 AppleObjCTypeEncodingParser::StructElement
 AppleObjCTypeEncodingParser::ReadStructElement(TypeSystemClang &ast_ctx,
diff --git a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTypeEncodingParser.h b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTypeEncodingParser.h
index 9a108967e1ab6..6e533b591ecab 100644
--- a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTypeEncodingParser.h
+++ b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTypeEncodingParser.h
@@ -29,7 +29,7 @@ class AppleObjCTypeEncodingParser : public ObjCLanguageRuntime::EncodingToType {
   struct StructElement {
     std::string name;
     clang::QualType type;
-    uint32_t bitfield;
+    uint32_t bitfield = 0;
 
     StructElement();
     ~StructElement() = default;
diff --git a/lldb/source/Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.h b/lldb/source/Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.h
index 9fc858648bcda..15fce04ea4652 100644
--- a/lldb/source/Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.h
+++ b/lldb/source/Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.h
@@ -49,9 +49,7 @@ class ObjCLanguageRuntime : public LanguageRuntime {
   // implementations of the runtime, and more might come
   class ClassDescriptor {
   public:
-    ClassDescriptor()
-        : m_is_kvo(eLazyBoolCalculate), m_is_cf(eLazyBoolCalculate),
-          m_type_wp() {}
+    ClassDescriptor() : m_type_wp() {}
 
     virtual ~ClassDescriptor() = default;
 
@@ -145,8 +143,8 @@ class ObjCLanguageRuntime : public LanguageRuntime {
                         bool check_version_specific = false) const;
 
   private:
-    LazyBool m_is_kvo;
-    LazyBool m_is_cf;
+    LazyBool m_is_kvo = eLazyBoolCalculate;
+    LazyBool m_is_cf = eLazyBoolCalculate;
     lldb::TypeWP m_type_wp;
   };
 
diff --git a/lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptRuntime.cpp b/lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptRuntime.cpp
index cd36a83ae680c..8a9be6d40c7c3 100644
--- a/lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptRuntime.cpp
+++ b/lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptRuntime.cpp
@@ -61,7 +61,7 @@ namespace {
 template <typename type_t> class empirical_type {
 public:
   // Ctor. Contents is invalid when constructed.
-  empirical_type() : valid(false) {}
+  empirical_type() {}
 
   // Return true and copy contents to out if valid, else return false.
   bool get(type_t &out) const {
@@ -99,7 +99,7 @@ template <typename type_t> class empirical_type {
   }
 
 protected:
-  bool valid;
+  bool valid = false;
   type_t data;
 };
 
@@ -4087,9 +4087,7 @@ class CommandObjectRenderScriptRuntimeReductionBreakpointSet
 
   class CommandOptions : public Options {
   public:
-    CommandOptions()
-        : Options(),
-          m_kernel_types(RSReduceBreakpointResolver::eKernelTypeAll) {}
+    CommandOptions() : Options() {}
 
     ~CommandOptions() override = default;
 
@@ -4175,7 +4173,7 @@ class CommandObjectRenderScriptRuntimeReductionBreakpointSet
       return true;
     }
 
-    int m_kernel_types;
+    int m_kernel_types = RSReduceBreakpointResolver::eKernelTypeAll;
     llvm::StringRef m_reduce_name;
     RSCoordinate m_coord;
     bool m_have_coord;
@@ -4653,7 +4651,7 @@ class CommandObjectRenderScriptRuntimeAllocationList
 
   class CommandOptions : public Options {
   public:
-    CommandOptions() : Options(), m_id(0) {}
+    CommandOptions() : Options() {}
 
     ~CommandOptions() override = default;
 
@@ -4681,7 +4679,7 @@ class CommandObjectRenderScriptRuntimeAllocationList
       return llvm::makeArrayRef(g_renderscript_runtime_alloc_list_options);
     }
 
-    uint32_t m_id;
+    uint32_t m_id = 0;
   };
 
   bool DoExecute(Args &command, CommandReturnObject &result) override {
diff --git a/lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptRuntime.h b/lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptRuntime.h
index 5e37265483692..982d24dc8a7a7 100644
--- a/lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptRuntime.h
+++ b/lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptRuntime.h
@@ -44,9 +44,9 @@ typedef std::shared_ptr<RSKernelDescriptor> RSKernelDescriptorSP;
 typedef std::shared_ptr<RSScriptGroupDescriptor> RSScriptGroupDescriptorSP;
 
 struct RSCoordinate {
-  uint32_t x, y, z;
+  uint32_t x = 0, y = 0, z = 0;
 
-  RSCoordinate() : x(), y(), z(){};
+  RSCoordinate(){};
 
   bool operator==(const lldb_renderscript::RSCoordinate &rhs) {
     return x == rhs.x && y == rhs.y && z == rhs.z;
diff --git a/lldb/source/Plugins/ObjectContainer/BSD-Archive/ObjectContainerBSDArchive.cpp b/lldb/source/Plugins/ObjectContainer/BSD-Archive/ObjectContainerBSDArchive.cpp
index 211eb9ce0d3aa..000ed78a77075 100644
--- a/lldb/source/Plugins/ObjectContainer/BSD-Archive/ObjectContainerBSDArchive.cpp
+++ b/lldb/source/Plugins/ObjectContainer/BSD-Archive/ObjectContainerBSDArchive.cpp
@@ -42,9 +42,7 @@ using namespace lldb_private;
 
 LLDB_PLUGIN_DEFINE(ObjectContainerBSDArchive)
 
-ObjectContainerBSDArchive::Object::Object()
-    : ar_name(), modification_time(0), uid(0), gid(0), mode(0), size(0),
-      file_offset(0), file_size(0) {}
+ObjectContainerBSDArchive::Object::Object() : ar_name() {}
 
 void ObjectContainerBSDArchive::Object::Clear() {
   ar_name.Clear();
diff --git a/lldb/source/Plugins/ObjectContainer/BSD-Archive/ObjectContainerBSDArchive.h b/lldb/source/Plugins/ObjectContainer/BSD-Archive/ObjectContainerBSDArchive.h
index f6862afff8a0b..9830e9b5d1b27 100644
--- a/lldb/source/Plugins/ObjectContainer/BSD-Archive/ObjectContainerBSDArchive.h
+++ b/lldb/source/Plugins/ObjectContainer/BSD-Archive/ObjectContainerBSDArchive.h
@@ -84,25 +84,25 @@ class ObjectContainerBSDArchive : public lldb_private::ObjectContainer {
     lldb_private::ConstString ar_name;
 
     /// Object modification time in the archive.
-    uint32_t modification_time;
+    uint32_t modification_time = 0;
 
     /// Object user id in the archive.
-    uint16_t uid;
+    uint16_t uid = 0;
 
     /// Object group id in the archive.
-    uint16_t gid;
+    uint16_t gid = 0;
 
     /// Object octal file permissions in the archive.
-    uint16_t mode;
+    uint16_t mode = 0;
 
     /// Object size in bytes in the archive.
-    uint32_t size;
+    uint32_t size = 0;
 
     /// File offset in bytes from the beginning of the file of the object data.
-    lldb::offset_t file_offset;
+    lldb::offset_t file_offset = 0;
 
     /// Length of the object data.
-    lldb::offset_t file_size;
+    lldb::offset_t file_size = 0;
   };
 
   class Archive {
diff --git a/lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.h b/lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.h
index 4fde0d141727a..8563af9d4eef4 100644
--- a/lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.h
+++ b/lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.h
@@ -22,13 +22,13 @@
 #include "ELFHeader.h"
 
 struct ELFNote {
-  elf::elf_word n_namesz;
-  elf::elf_word n_descsz;
-  elf::elf_word n_type;
+  elf::elf_word n_namesz = 0;
+  elf::elf_word n_descsz = 0;
+  elf::elf_word n_type = 0;
 
   std::string n_name;
 
-  ELFNote() : n_namesz(0), n_descsz(0), n_type(0) {}
+  ELFNote() {}
 
   /// Parse an ELFNote entry from the given DataExtractor starting at position
   /// \p offset.
diff --git a/lldb/source/Plugins/Platform/MacOSX/PlatformRemoteDarwinDevice.cpp b/lldb/source/Plugins/Platform/MacOSX/PlatformRemoteDarwinDevice.cpp
index 8a11f40ba0aba..86b5a3e2e3e6d 100644
--- a/lldb/source/Plugins/Platform/MacOSX/PlatformRemoteDarwinDevice.cpp
+++ b/lldb/source/Plugins/Platform/MacOSX/PlatformRemoteDarwinDevice.cpp
@@ -39,9 +39,7 @@ PlatformRemoteDarwinDevice::SDKDirectoryInfo::SDKDirectoryInfo(
 PlatformRemoteDarwinDevice::PlatformRemoteDarwinDevice()
     : PlatformDarwin(false), // This is a remote platform
       m_sdk_directory_infos(), m_device_support_directory(),
-      m_device_support_directory_for_os_version(), m_build_update(),
-      m_last_module_sdk_idx(UINT32_MAX),
-      m_connected_module_sdk_idx(UINT32_MAX) {}
+      m_device_support_directory_for_os_version(), m_build_update() {}
 
 /// Destructor.
 ///
diff --git a/lldb/source/Plugins/Platform/MacOSX/PlatformRemoteDarwinDevice.h b/lldb/source/Plugins/Platform/MacOSX/PlatformRemoteDarwinDevice.h
index 6f6ede7c34b74..3b578a3fe917e 100644
--- a/lldb/source/Plugins/Platform/MacOSX/PlatformRemoteDarwinDevice.h
+++ b/lldb/source/Plugins/Platform/MacOSX/PlatformRemoteDarwinDevice.h
@@ -64,8 +64,8 @@ class PlatformRemoteDarwinDevice : public PlatformDarwin {
   std::string m_device_support_directory;
   std::string m_device_support_directory_for_os_version;
   std::string m_build_update;
-  uint32_t m_last_module_sdk_idx;
-  uint32_t m_connected_module_sdk_idx;
+  uint32_t m_last_module_sdk_idx = UINT32_MAX;
+  uint32_t m_connected_module_sdk_idx = UINT32_MAX;
 
   bool UpdateSDKDirectoryInfosIfNeeded();
 
diff --git a/lldb/source/Plugins/Platform/MacOSX/objcxx/PlatformiOSSimulatorCoreSimulatorSupport.h b/lldb/source/Plugins/Platform/MacOSX/objcxx/PlatformiOSSimulatorCoreSimulatorSupport.h
index 5104e488189f5..a35efd53f313e 100644
--- a/lldb/source/Plugins/Platform/MacOSX/objcxx/PlatformiOSSimulatorCoreSimulatorSupport.h
+++ b/lldb/source/Plugins/Platform/MacOSX/objcxx/PlatformiOSSimulatorCoreSimulatorSupport.h
@@ -93,7 +93,7 @@ class DeviceType {
   ProductFamilyID GetProductFamilyID();
 
 private:
-  id m_dev;
+  id m_dev = nullptr;
   llvm::Optional<ModelIdentifier> m_model_identifier;
 };
 
@@ -129,7 +129,7 @@ class DeviceRuntime {
   bool IsAvailable();
 
 private:
-  id m_dev;
+  id m_dev = nullptr;
   llvm::Optional<OSVersion> m_os_version;
 };
 
@@ -169,7 +169,7 @@ class Device {
   Process Spawn(lldb_private::ProcessLaunchInfo &launch_info);
 
 private:
-  id m_dev;
+  id m_dev = nullptr;
   llvm::Optional<DeviceType> m_dev_type;
   llvm::Optional<DeviceRuntime> m_dev_runtime;
 
diff --git a/lldb/source/Plugins/Platform/MacOSX/objcxx/PlatformiOSSimulatorCoreSimulatorSupport.mm b/lldb/source/Plugins/Platform/MacOSX/objcxx/PlatformiOSSimulatorCoreSimulatorSupport.mm
index 66fe569f6779e..91d6252aa0b16 100644
--- a/lldb/source/Plugins/Platform/MacOSX/objcxx/PlatformiOSSimulatorCoreSimulatorSupport.mm
+++ b/lldb/source/Plugins/Platform/MacOSX/objcxx/PlatformiOSSimulatorCoreSimulatorSupport.mm
@@ -66,8 +66,7 @@ - (BOOL)spawnWithPath:(NSString *)path
 CoreSimulatorSupport::Process::Process(lldb::pid_t p, Status error)
     : m_pid(p), m_error(error) {}
 
-CoreSimulatorSupport::DeviceType::DeviceType()
-    : m_dev(nil), m_model_identifier() {}
+CoreSimulatorSupport::DeviceType::DeviceType() : m_model_identifier() {}
 
 CoreSimulatorSupport::DeviceType::DeviceType(id d)
     : m_dev(d), m_model_identifier() {}
@@ -87,8 +86,7 @@ - (BOOL)spawnWithPath:(NSString *)path
   return ProductFamilyID([m_dev productFamilyID]);
 }
 
-CoreSimulatorSupport::DeviceRuntime::DeviceRuntime()
-    : m_dev(nil), m_os_version() {}
+CoreSimulatorSupport::DeviceRuntime::DeviceRuntime() : m_os_version() {}
 
 CoreSimulatorSupport::DeviceRuntime::DeviceRuntime(id d)
     : m_dev(d), m_os_version() {}
@@ -99,8 +97,7 @@ - (BOOL)spawnWithPath:(NSString *)path
   return [m_dev available];
 }
 
-CoreSimulatorSupport::Device::Device()
-    : m_dev(nil), m_dev_type(), m_dev_runtime() {}
+CoreSimulatorSupport::Device::Device() : m_dev_type(), m_dev_runtime() {}
 
 CoreSimulatorSupport::Device::Device(id d)
     : m_dev(d), m_dev_type(), m_dev_runtime() {}
diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
index deb254e932a1a..0abc80250d48f 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
@@ -55,41 +55,7 @@ llvm::raw_ostream &process_gdb_remote::operator<<(llvm::raw_ostream &os,
 // GDBRemoteCommunicationClient constructor
 GDBRemoteCommunicationClient::GDBRemoteCommunicationClient()
     : GDBRemoteClientBase("gdb-remote.client", "gdb-remote.client.rx_packet"),
-      m_supports_not_sending_acks(eLazyBoolCalculate),
-      m_supports_thread_suffix(eLazyBoolCalculate),
-      m_supports_threads_in_stop_reply(eLazyBoolCalculate),
-      m_supports_vCont_all(eLazyBoolCalculate),
-      m_supports_vCont_any(eLazyBoolCalculate),
-      m_supports_vCont_c(eLazyBoolCalculate),
-      m_supports_vCont_C(eLazyBoolCalculate),
-      m_supports_vCont_s(eLazyBoolCalculate),
-      m_supports_vCont_S(eLazyBoolCalculate),
-      m_qHostInfo_is_valid(eLazyBoolCalculate),
-      m_curr_pid_is_valid(eLazyBoolCalculate),
-      m_qProcessInfo_is_valid(eLazyBoolCalculate),
-      m_qGDBServerVersion_is_valid(eLazyBoolCalculate),
-      m_supports_alloc_dealloc_memory(eLazyBoolCalculate),
-      m_supports_memory_region_info(eLazyBoolCalculate),
-      m_supports_watchpoint_support_info(eLazyBoolCalculate),
-      m_supports_detach_stay_stopped(eLazyBoolCalculate),
-      m_watchpoints_trigger_after_instruction(eLazyBoolCalculate),
-      m_attach_or_wait_reply(eLazyBoolCalculate),
-      m_prepare_for_reg_writing_reply(eLazyBoolCalculate),
-      m_supports_p(eLazyBoolCalculate), m_supports_x(eLazyBoolCalculate),
-      m_avoid_g_packets(eLazyBoolCalculate),
-      m_supports_QSaveRegisterState(eLazyBoolCalculate),
-      m_supports_qXfer_auxv_read(eLazyBoolCalculate),
-      m_supports_qXfer_libraries_read(eLazyBoolCalculate),
-      m_supports_qXfer_libraries_svr4_read(eLazyBoolCalculate),
-      m_supports_qXfer_features_read(eLazyBoolCalculate),
-      m_supports_qXfer_memory_map_read(eLazyBoolCalculate),
-      m_supports_augmented_libraries_svr4_read(eLazyBoolCalculate),
-      m_supports_jThreadExtendedInfo(eLazyBoolCalculate),
-      m_supports_jLoadedDynamicLibrariesInfos(eLazyBoolCalculate),
-      m_supports_jGetSharedCacheInfo(eLazyBoolCalculate),
-      m_supports_QPassSignals(eLazyBoolCalculate),
-      m_supports_error_string_reply(eLazyBoolCalculate),
-      m_supports_multiprocess(eLazyBoolCalculate),
+
       m_supports_qProcessInfoPID(true), m_supports_qfProcessInfo(true),
       m_supports_qUserName(true), m_supports_qGroupName(true),
       m_supports_qThreadStopInfo(true), m_supports_z0(true),
@@ -98,15 +64,11 @@ GDBRemoteCommunicationClient::GDBRemoteCommunicationClient()
       m_supports_QEnvironmentHexEncoded(true), m_supports_qSymbol(true),
       m_qSymbol_requests_done(false), m_supports_qModuleInfo(true),
       m_supports_jThreadsInfo(true), m_supports_jModulesInfo(true),
-      m_curr_pid(LLDB_INVALID_PROCESS_ID), m_curr_tid(LLDB_INVALID_THREAD_ID),
-      m_curr_tid_run(LLDB_INVALID_THREAD_ID),
-      m_num_supported_hardware_watchpoints(0), m_addressing_bits(0),
+
       m_host_arch(), m_process_arch(), m_os_build(), m_os_kernel(),
-      m_hostname(), m_gdb_server_name(), m_gdb_server_version(UINT32_MAX),
-      m_default_packet_timeout(0), m_max_packet_size(0),
-      m_qSupported_response(), m_supported_async_json_packets_is_valid(false),
-      m_supported_async_json_packets_sp(), m_qXfer_memory_map(),
-      m_qXfer_memory_map_loaded(false) {}
+      m_hostname(), m_gdb_server_name(), m_default_packet_timeout(0),
+      m_qSupported_response(), m_supported_async_json_packets_sp(),
+      m_qXfer_memory_map() {}
 
 // Destructor
 GDBRemoteCommunicationClient::~GDBRemoteCommunicationClient() {
diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
index 1891842a69444..975baa2f08df2 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
@@ -522,42 +522,42 @@ class GDBRemoteCommunicationClient : public GDBRemoteClientBase {
   SendTraceGetBinaryData(const TraceGetBinaryDataRequest &request);
 
 protected:
-  LazyBool m_supports_not_sending_acks;
-  LazyBool m_supports_thread_suffix;
-  LazyBool m_supports_threads_in_stop_reply;
-  LazyBool m_supports_vCont_all;
-  LazyBool m_supports_vCont_any;
-  LazyBool m_supports_vCont_c;
-  LazyBool m_supports_vCont_C;
-  LazyBool m_supports_vCont_s;
-  LazyBool m_supports_vCont_S;
-  LazyBool m_qHostInfo_is_valid;
-  LazyBool m_curr_pid_is_valid;
-  LazyBool m_qProcessInfo_is_valid;
-  LazyBool m_qGDBServerVersion_is_valid;
-  LazyBool m_supports_alloc_dealloc_memory;
-  LazyBool m_supports_memory_region_info;
-  LazyBool m_supports_watchpoint_support_info;
-  LazyBool m_supports_detach_stay_stopped;
-  LazyBool m_watchpoints_trigger_after_instruction;
-  LazyBool m_attach_or_wait_reply;
-  LazyBool m_prepare_for_reg_writing_reply;
-  LazyBool m_supports_p;
-  LazyBool m_supports_x;
-  LazyBool m_avoid_g_packets;
-  LazyBool m_supports_QSaveRegisterState;
-  LazyBool m_supports_qXfer_auxv_read;
-  LazyBool m_supports_qXfer_libraries_read;
-  LazyBool m_supports_qXfer_libraries_svr4_read;
-  LazyBool m_supports_qXfer_features_read;
-  LazyBool m_supports_qXfer_memory_map_read;
-  LazyBool m_supports_augmented_libraries_svr4_read;
-  LazyBool m_supports_jThreadExtendedInfo;
-  LazyBool m_supports_jLoadedDynamicLibrariesInfos;
-  LazyBool m_supports_jGetSharedCacheInfo;
-  LazyBool m_supports_QPassSignals;
-  LazyBool m_supports_error_string_reply;
-  LazyBool m_supports_multiprocess;
+  LazyBool m_supports_not_sending_acks = eLazyBoolCalculate;
+  LazyBool m_supports_thread_suffix = eLazyBoolCalculate;
+  LazyBool m_supports_threads_in_stop_reply = eLazyBoolCalculate;
+  LazyBool m_supports_vCont_all = eLazyBoolCalculate;
+  LazyBool m_supports_vCont_any = eLazyBoolCalculate;
+  LazyBool m_supports_vCont_c = eLazyBoolCalculate;
+  LazyBool m_supports_vCont_C = eLazyBoolCalculate;
+  LazyBool m_supports_vCont_s = eLazyBoolCalculate;
+  LazyBool m_supports_vCont_S = eLazyBoolCalculate;
+  LazyBool m_qHostInfo_is_valid = eLazyBoolCalculate;
+  LazyBool m_curr_pid_is_valid = eLazyBoolCalculate;
+  LazyBool m_qProcessInfo_is_valid = eLazyBoolCalculate;
+  LazyBool m_qGDBServerVersion_is_valid = eLazyBoolCalculate;
+  LazyBool m_supports_alloc_dealloc_memory = eLazyBoolCalculate;
+  LazyBool m_supports_memory_region_info = eLazyBoolCalculate;
+  LazyBool m_supports_watchpoint_support_info = eLazyBoolCalculate;
+  LazyBool m_supports_detach_stay_stopped = eLazyBoolCalculate;
+  LazyBool m_watchpoints_trigger_after_instruction = eLazyBoolCalculate;
+  LazyBool m_attach_or_wait_reply = eLazyBoolCalculate;
+  LazyBool m_prepare_for_reg_writing_reply = eLazyBoolCalculate;
+  LazyBool m_supports_p = eLazyBoolCalculate;
+  LazyBool m_supports_x = eLazyBoolCalculate;
+  LazyBool m_avoid_g_packets = eLazyBoolCalculate;
+  LazyBool m_supports_QSaveRegisterState = eLazyBoolCalculate;
+  LazyBool m_supports_qXfer_auxv_read = eLazyBoolCalculate;
+  LazyBool m_supports_qXfer_libraries_read = eLazyBoolCalculate;
+  LazyBool m_supports_qXfer_libraries_svr4_read = eLazyBoolCalculate;
+  LazyBool m_supports_qXfer_features_read = eLazyBoolCalculate;
+  LazyBool m_supports_qXfer_memory_map_read = eLazyBoolCalculate;
+  LazyBool m_supports_augmented_libraries_svr4_read = eLazyBoolCalculate;
+  LazyBool m_supports_jThreadExtendedInfo = eLazyBoolCalculate;
+  LazyBool m_supports_jLoadedDynamicLibrariesInfos = eLazyBoolCalculate;
+  LazyBool m_supports_jGetSharedCacheInfo = eLazyBoolCalculate;
+  LazyBool m_supports_QPassSignals = eLazyBoolCalculate;
+  LazyBool m_supports_error_string_reply = eLazyBoolCalculate;
+  LazyBool m_supports_multiprocess = eLazyBoolCalculate;
 
   bool m_supports_qProcessInfoPID : 1, m_supports_qfProcessInfo : 1,
       m_supports_qUserName : 1, m_supports_qGroupName : 1,
@@ -568,14 +568,16 @@ class GDBRemoteCommunicationClient : public GDBRemoteClientBase {
       m_supports_qModuleInfo : 1, m_supports_jThreadsInfo : 1,
       m_supports_jModulesInfo : 1;
 
-  lldb::pid_t m_curr_pid;
-  lldb::tid_t m_curr_tid; // Current gdb remote protocol thread index for all
-                          // other operations
-  lldb::tid_t m_curr_tid_run; // Current gdb remote protocol thread index for
+  lldb::pid_t m_curr_pid = LLDB_INVALID_PROCESS_ID;
+  lldb::tid_t m_curr_tid =
+      LLDB_INVALID_THREAD_ID; // Current gdb remote protocol thread index for
+                              // all other operations
+  lldb::tid_t m_curr_tid_run =
+      LLDB_INVALID_THREAD_ID; // Current gdb remote protocol thread index for
                               // continue, step, etc
 
-  uint32_t m_num_supported_hardware_watchpoints;
-  uint32_t m_addressing_bits;
+  uint32_t m_num_supported_hardware_watchpoints = 0;
+  uint32_t m_addressing_bits = 0;
 
   ArchSpec m_host_arch;
   ArchSpec m_process_arch;
@@ -586,17 +588,18 @@ class GDBRemoteCommunicationClient : public GDBRemoteClientBase {
   std::string m_hostname;
   std::string m_gdb_server_name; // from reply to qGDBServerVersion, empty if
                                  // qGDBServerVersion is not supported
-  uint32_t m_gdb_server_version; // from reply to qGDBServerVersion, zero if
-                                 // qGDBServerVersion is not supported
+  uint32_t m_gdb_server_version =
+      UINT32_MAX; // from reply to qGDBServerVersion, zero if
+                  // qGDBServerVersion is not supported
   std::chrono::seconds m_default_packet_timeout;
-  uint64_t m_max_packet_size;        // as returned by qSupported
+  uint64_t m_max_packet_size = 0;    // as returned by qSupported
   std::string m_qSupported_response; // the complete response to qSupported
 
-  bool m_supported_async_json_packets_is_valid;
+  bool m_supported_async_json_packets_is_valid = false;
   lldb_private::StructuredData::ObjectSP m_supported_async_json_packets_sp;
 
   std::vector<MemoryRegionInfo> m_qXfer_memory_map;
-  bool m_qXfer_memory_map_loaded;
+  bool m_qXfer_memory_map_loaded = false;
 
   bool GetCurrentProcessInfo(bool allow_lazy_pid = true);
 
diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationHistory.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationHistory.cpp
index 3984a45c3da1e..9aca9e1e33453 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationHistory.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationHistory.cpp
@@ -19,8 +19,7 @@ using namespace lldb_private;
 using namespace lldb_private::process_gdb_remote;
 
 GDBRemoteCommunicationHistory::GDBRemoteCommunicationHistory(uint32_t size)
-    : m_packets(), m_curr_idx(0), m_total_packet_count(0),
-      m_dumped_to_log(false) {
+    : m_packets() {
   if (size)
     m_packets.resize(size);
 }
diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationHistory.h b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationHistory.h
index e783e59c34559..eda464a758e49 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationHistory.h
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationHistory.h
@@ -74,9 +74,9 @@ class GDBRemoteCommunicationHistory {
   }
 
   std::vector<GDBRemotePacket> m_packets;
-  uint32_t m_curr_idx;
-  uint32_t m_total_packet_count;
-  mutable bool m_dumped_to_log;
+  uint32_t m_curr_idx = 0;
+  uint32_t m_total_packet_count = 0;
+  mutable bool m_dumped_to_log = false;
   repro::PacketRecorder *m_recorder = nullptr;
 };
 
diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationReplayServer.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationReplayServer.cpp
index 992adeea8fa1d..c91d7cb5ac30f 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationReplayServer.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationReplayServer.cpp
@@ -74,7 +74,7 @@ GDBRemoteCommunicationReplayServer::GDBRemoteCommunicationReplayServer()
       m_async_broadcaster(nullptr, "lldb.gdb-replay.async-broadcaster"),
       m_async_listener_sp(
           Listener::MakeListener("lldb.gdb-replay.async-listener")),
-      m_async_thread_state_mutex(), m_skip_acks(false) {
+      m_async_thread_state_mutex() {
   m_async_broadcaster.SetEventName(eBroadcastBitAsyncContinue,
                                    "async thread continue");
   m_async_broadcaster.SetEventName(eBroadcastBitAsyncThreadShouldExit,
diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationReplayServer.h b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationReplayServer.h
index c13e5ee0bf923..2f8770d0accfc 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationReplayServer.h
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationReplayServer.h
@@ -73,7 +73,7 @@ class GDBRemoteCommunicationReplayServer : public GDBRemoteCommunication {
   HostThread m_async_thread;
   std::recursive_mutex m_async_thread_state_mutex;
 
-  bool m_skip_acks;
+  bool m_skip_acks = false;
 
 private:
   GDBRemoteCommunicationReplayServer(
diff --git a/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.h b/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.h
index 22f6c67eb7a5d..6ca0e754c9d45 100644
--- a/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.h
+++ b/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.h
@@ -229,7 +229,7 @@ struct PythonFormat<
 
 class PythonObject {
 public:
-  PythonObject() : m_py_obj(nullptr) {}
+  PythonObject() {}
 
   PythonObject(PyRefType type, PyObject *py_obj) {
     m_py_obj = py_obj;
@@ -378,7 +378,7 @@ class PythonObject {
   }
 
 protected:
-  PyObject *m_py_obj;
+  PyObject *m_py_obj = nullptr;
 };
 
 
diff --git a/lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp b/lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp
index 025c2eb4860de..fd4157d1d2504 100644
--- a/lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp
+++ b/lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp
@@ -236,8 +236,7 @@ namespace {
 // save off initial state at the beginning, and restore it at the end
 struct InitializePythonRAII {
 public:
-  InitializePythonRAII()
-      : m_gil_state(PyGILState_UNLOCKED), m_was_already_initialized(false) {
+  InitializePythonRAII() {
     InitializePythonHome();
 
 #ifdef LLDB_USE_LIBEDIT_READLINE_COMPAT_MODULE
@@ -357,8 +356,8 @@ struct InitializePythonRAII {
   }
 
   TerminalState m_stdin_tty_state;
-  PyGILState_STATE m_gil_state;
-  bool m_was_already_initialized;
+  PyGILState_STATE m_gil_state = PyGILState_UNLOCKED;
+  bool m_was_already_initialized = false;
 };
 } // namespace
 
diff --git a/lldb/source/Plugins/StructuredData/DarwinLog/StructuredDataDarwinLog.cpp b/lldb/source/Plugins/StructuredData/DarwinLog/StructuredDataDarwinLog.cpp
index ce9b346ae6bef..c0dbc86fb0704 100644
--- a/lldb/source/Plugins/StructuredData/DarwinLog/StructuredDataDarwinLog.cpp
+++ b/lldb/source/Plugins/StructuredData/DarwinLog/StructuredDataDarwinLog.cpp
@@ -473,13 +473,9 @@ static constexpr OptionDefinition g_enable_option_table[] = {
 class EnableOptions : public Options {
 public:
   EnableOptions()
-      : Options(), m_include_debug_level(false), m_include_info_level(false),
-        m_include_any_process(false),
+      : Options(),
         m_filter_fall_through_accepts(DEFAULT_FILTER_FALLTHROUGH_ACCEPTS),
-        m_echo_to_stderr(false), m_display_timestamp_relative(false),
-        m_display_subsystem(false), m_display_category(false),
-        m_display_activity_chain(false), m_broadcast_events(true),
-        m_live_stream(true), m_filter_rules() {}
+        m_filter_rules() {}
 
   void OptionParsingStarting(ExecutionContext *execution_context) override {
     m_include_debug_level = false;
@@ -728,17 +724,17 @@ class EnableOptions : public Options {
     return -1;
   }
 
-  bool m_include_debug_level;
-  bool m_include_info_level;
-  bool m_include_any_process;
+  bool m_include_debug_level = false;
+  bool m_include_info_level = false;
+  bool m_include_any_process = false;
   bool m_filter_fall_through_accepts;
-  bool m_echo_to_stderr;
-  bool m_display_timestamp_relative;
-  bool m_display_subsystem;
-  bool m_display_category;
-  bool m_display_activity_chain;
-  bool m_broadcast_events;
-  bool m_live_stream;
+  bool m_echo_to_stderr = false;
+  bool m_display_timestamp_relative = false;
+  bool m_display_subsystem = false;
+  bool m_display_category = false;
+  bool m_display_activity_chain = false;
+  bool m_broadcast_events = true;
+  bool m_live_stream = true;
   FilterRules m_filter_rules;
 };
 
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFAbbreviationDeclaration.cpp b/lldb/source/Plugins/SymbolFile/DWARF/DWARFAbbreviationDeclaration.cpp
index 6a952ff887729..2f6b36c79b802 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFAbbreviationDeclaration.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFAbbreviationDeclaration.cpp
@@ -17,9 +17,7 @@
 
 using namespace lldb_private;
 
-DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration()
-    : m_code(InvalidCode), m_tag(llvm::dwarf::DW_TAG_null), m_has_children(0),
-      m_attributes() {}
+DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration() : m_attributes() {}
 
 DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration(dw_tag_t tag,
                                                            uint8_t has_children)
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFAbbreviationDeclaration.h b/lldb/source/Plugins/SymbolFile/DWARF/DWARFAbbreviationDeclaration.h
index b9e0204363c1e..378ba888f4e0f 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFAbbreviationDeclaration.h
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFAbbreviationDeclaration.h
@@ -55,9 +55,9 @@ class DWARFAbbreviationDeclaration {
   bool IsValid();
 
 protected:
-  dw_uleb128_t m_code;
-  dw_tag_t m_tag;
-  uint8_t m_has_children;
+  dw_uleb128_t m_code = InvalidCode;
+  dw_tag_t m_tag = llvm::dwarf::DW_TAG_null;
+  uint8_t m_has_children = 0;
   DWARFAttribute::collection m_attributes;
 };
 
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFBaseDIE.h b/lldb/source/Plugins/SymbolFile/DWARF/DWARFBaseDIE.h
index 059b84864be7e..8b6268aba33ab 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFBaseDIE.h
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFBaseDIE.h
@@ -24,7 +24,7 @@ class SymbolFileDWARF;
 
 class DWARFBaseDIE {
 public:
-  DWARFBaseDIE() : m_cu(nullptr), m_die(nullptr) {}
+  DWARFBaseDIE() {}
 
   DWARFBaseDIE(DWARFUnit *cu, DWARFDebugInfoEntry *die)
       : m_cu(cu), m_die(die) {}
@@ -115,8 +115,8 @@ class DWARFBaseDIE {
                        Recurse recurse = Recurse::yes) const;
 
 protected:
-  DWARFUnit *m_cu;
-  DWARFDebugInfoEntry *m_die;
+  DWARFUnit *m_cu = nullptr;
+  DWARFDebugInfoEntry *m_die = nullptr;
 };
 
 bool operator==(const DWARFBaseDIE &lhs, const DWARFBaseDIE &rhs);
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugAbbrev.h b/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugAbbrev.h
index 555864f449670..ec6b93ce0e7f8 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugAbbrev.h
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugAbbrev.h
@@ -26,8 +26,7 @@ typedef DWARFAbbreviationDeclarationColl::const_iterator
 
 class DWARFAbbreviationDeclarationSet {
 public:
-  DWARFAbbreviationDeclarationSet()
-      : m_offset(DW_INVALID_OFFSET), m_idx_offset(0), m_decls() {}
+  DWARFAbbreviationDeclarationSet() : m_offset(DW_INVALID_OFFSET), m_decls() {}
 
   DWARFAbbreviationDeclarationSet(dw_offset_t offset, uint32_t idx_offset)
       : m_offset(offset), m_idx_offset(idx_offset), m_decls() {}
@@ -51,7 +50,7 @@ class DWARFAbbreviationDeclarationSet {
   /// @}
 private:
   dw_offset_t m_offset;
-  uint32_t m_idx_offset;
+  uint32_t m_idx_offset = 0;
   std::vector<DWARFAbbreviationDeclaration> m_decls;
 };
 
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.h b/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.h
index 0ba56a0a41614..64e86c71ac09e 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.h
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.h
@@ -35,8 +35,7 @@ class DWARFDebugInfoEntry {
   typedef collection::const_iterator const_iterator;
 
   DWARFDebugInfoEntry()
-      : m_offset(DW_INVALID_OFFSET), m_parent_idx(0), m_sibling_idx(0),
-        m_has_children(false), m_abbr_idx(0), m_tag(llvm::dwarf::DW_TAG_null) {}
+      : m_offset(DW_INVALID_OFFSET), m_sibling_idx(0), m_has_children(false) {}
 
   explicit operator bool() const { return m_offset != DW_INVALID_OFFSET; }
   bool operator==(const DWARFDebugInfoEntry &rhs) const;
@@ -167,14 +166,14 @@ class DWARFDebugInfoEntry {
   GetDWARFDeclContextStatic(const DWARFDebugInfoEntry *die, DWARFUnit *cu);
 
   dw_offset_t m_offset; // Offset within the .debug_info/.debug_types
-  uint32_t m_parent_idx; // How many to subtract from "this" to get the parent.
-                         // If zero this die has no parent
+  uint32_t m_parent_idx = 0;   // How many to subtract from "this" to get the
+                               // parent. If zero this die has no parent
   uint32_t m_sibling_idx : 31, // How many to add to "this" to get the sibling.
       // If it is zero, then the DIE doesn't have children, or the
       // DWARF claimed it had children but the DIE only contained
       // a single NULL terminating child.
       m_has_children : 1;
-  uint16_t m_abbr_idx;
+  uint16_t m_abbr_idx = 0;
   /// A copy of the DW_TAG value so we don't have to go through the compile
   /// unit abbrev table
   dw_tag_t m_tag = llvm::dwarf::DW_TAG_null;
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFDeclContext.h b/lldb/source/Plugins/SymbolFile/DWARF/DWARFDeclContext.h
index 9072b2dc0115f..c306816d186bb 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFDeclContext.h
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFDeclContext.h
@@ -23,7 +23,7 @@
 class DWARFDeclContext {
 public:
   struct Entry {
-    Entry() : tag(llvm::dwarf::DW_TAG_null), name(nullptr) {}
+    Entry() {}
     Entry(dw_tag_t t, const char *n) : tag(t), name(n) {}
 
     bool NameMatches(const Entry &rhs) const {
@@ -37,11 +37,11 @@ class DWARFDeclContext {
     // Test operator
     explicit operator bool() const { return tag != 0; }
 
-    dw_tag_t tag;
-    const char *name;
+    dw_tag_t tag = llvm::dwarf::DW_TAG_null;
+    const char *name = nullptr;
   };
 
-  DWARFDeclContext() : m_entries(), m_language(lldb::eLanguageTypeUnknown) {}
+  DWARFDeclContext() : m_entries() {}
 
   void AppendDeclContext(dw_tag_t tag, const char *name) {
     m_entries.push_back(Entry(tag, name));
@@ -83,7 +83,7 @@ class DWARFDeclContext {
   typedef std::vector<Entry> collection;
   collection m_entries;
   mutable std::string m_qualified_name;
-  lldb::LanguageType m_language;
+  lldb::LanguageType m_language = lldb::eLanguageTypeUnknown;
 };
 
 #endif // LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DWARFDECLCONTEXT_H
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFFormValue.h b/lldb/source/Plugins/SymbolFile/DWARF/DWARFFormValue.h
index 9ca4cc1c8d970..9406bcf0c0384 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFFormValue.h
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFFormValue.h
@@ -20,14 +20,14 @@ class DWARFDIE;
 class DWARFFormValue {
 public:
   typedef struct ValueTypeTag {
-    ValueTypeTag() : value(), data(nullptr) { value.uval = 0; }
+    ValueTypeTag() : value() { value.uval = 0; }
 
     union {
       uint64_t uval;
       int64_t sval;
       const char *cstr;
     } value;
-    const uint8_t *data;
+    const uint8_t *data = nullptr;
   } ValueType;
 
   enum {
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/HashedNameToDIE.cpp b/lldb/source/Plugins/SymbolFile/DWARF/HashedNameToDIE.cpp
index d36f2a8bccf7f..ce71281db8bd1 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/HashedNameToDIE.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/HashedNameToDIE.cpp
@@ -130,8 +130,7 @@ DWARFMappedHash::DIEInfo::DIEInfo(dw_offset_t o, dw_tag_t t, uint32_t f,
     : die_offset(o), tag(t), type_flags(f), qualified_name_hash(h) {}
 
 DWARFMappedHash::Prologue::Prologue(dw_offset_t _die_base_offset)
-    : die_base_offset(_die_base_offset), atoms(), atom_mask(0),
-      min_hash_data_byte_size(0), hash_data_has_fixed_byte_size(true) {
+    : die_base_offset(_die_base_offset), atoms() {
   // Define an array of DIE offsets by first defining an array, and then define
   // the atom type for the array, in this case we have an array of DIE offsets.
   AppendAtom(eAtomTypeDIEOffset, DW_FORM_data4);
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/HashedNameToDIE.h b/lldb/source/Plugins/SymbolFile/DWARF/HashedNameToDIE.h
index ad178fc6a9876..efc08e47a2800 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/HashedNameToDIE.h
+++ b/lldb/source/Plugins/SymbolFile/DWARF/HashedNameToDIE.h
@@ -101,9 +101,9 @@ class DWARFMappedHash {
     /// DIE offset base so die offsets in hash_data can be CU relative.
     dw_offset_t die_base_offset;
     AtomArray atoms;
-    uint32_t atom_mask;
-    size_t min_hash_data_byte_size;
-    bool hash_data_has_fixed_byte_size;
+    uint32_t atom_mask = 0;
+    size_t min_hash_data_byte_size = 0;
+    bool hash_data_has_fixed_byte_size = true;
   };
 
   class Header : public MappedHash::Header<Prologue> {
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARFDebugMap.h b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARFDebugMap.h
index 4267544a3e966..1876de09945bf 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARFDebugMap.h
+++ b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARFDebugMap.h
@@ -170,18 +170,17 @@ class SymbolFileDWARFDebugMap : public lldb_private::SymbolFile {
     llvm::sys::TimePoint<> oso_mod_time;
     OSOInfoSP oso_sp;
     lldb::CompUnitSP compile_unit_sp;
-    uint32_t first_symbol_index;
-    uint32_t last_symbol_index;
-    uint32_t first_symbol_id;
-    uint32_t last_symbol_id;
+    uint32_t first_symbol_index = UINT32_MAX;
+    uint32_t last_symbol_index = UINT32_MAX;
+    uint32_t first_symbol_id = UINT32_MAX;
+    uint32_t last_symbol_id = UINT32_MAX;
     FileRangeMap file_range_map;
-    bool file_range_map_valid;
+    bool file_range_map_valid = false;
 
     CompileUnitInfo()
         : so_file(), oso_path(), oso_mod_time(), oso_sp(), compile_unit_sp(),
-          first_symbol_index(UINT32_MAX), last_symbol_index(UINT32_MAX),
-          first_symbol_id(UINT32_MAX), last_symbol_id(UINT32_MAX),
-          file_range_map(), file_range_map_valid(false) {}
+
+          file_range_map() {}
 
     const FileRangeMap &GetFileRangeMap(SymbolFileDWARFDebugMap *exe_symfile);
   };
@@ -279,8 +278,7 @@ class SymbolFileDWARFDebugMap : public lldb_private::SymbolFile {
   // OSOEntry
   class OSOEntry {
   public:
-    OSOEntry()
-        : m_exe_sym_idx(UINT32_MAX), m_oso_file_addr(LLDB_INVALID_ADDRESS) {}
+    OSOEntry() {}
 
     OSOEntry(uint32_t exe_sym_idx, lldb::addr_t oso_file_addr)
         : m_exe_sym_idx(exe_sym_idx), m_oso_file_addr(oso_file_addr) {}
@@ -298,8 +296,8 @@ class SymbolFileDWARFDebugMap : public lldb_private::SymbolFile {
     }
 
   protected:
-    uint32_t m_exe_sym_idx;
-    lldb::addr_t m_oso_file_addr;
+    uint32_t m_exe_sym_idx = UINT32_MAX;
+    lldb::addr_t m_oso_file_addr = LLDB_INVALID_ADDRESS;
   };
 
   typedef lldb_private::RangeDataVector<lldb::addr_t, lldb::addr_t, OSOEntry>
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/UniqueDWARFASTType.h b/lldb/source/Plugins/SymbolFile/DWARF/UniqueDWARFASTType.h
index 40240a1f2a12e..a1ac1c4a746d7 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/UniqueDWARFASTType.h
+++ b/lldb/source/Plugins/SymbolFile/DWARF/UniqueDWARFASTType.h
@@ -19,11 +19,7 @@
 class UniqueDWARFASTType {
 public:
   // Constructors and Destructors
-  UniqueDWARFASTType()
-      : m_type_sp(), m_die(), m_declaration(),
-        m_byte_size(
-            -1) // Set to negative value to make sure we have a valid value
-  {}
+  UniqueDWARFASTType() : m_type_sp(), m_die(), m_declaration() {}
 
   UniqueDWARFASTType(lldb::TypeSP &type_sp, const DWARFDIE &die,
                      const lldb_private::Declaration &decl, int32_t byte_size)
@@ -49,7 +45,7 @@ class UniqueDWARFASTType {
   lldb::TypeSP m_type_sp;
   DWARFDIE m_die;
   lldb_private::Declaration m_declaration;
-  int32_t m_byte_size;
+  int32_t m_byte_size = -1;
 };
 
 class UniqueDWARFASTTypeList {
diff --git a/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetItemInfoHandler.h b/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetItemInfoHandler.h
index f1119a9562ea2..855604bc62b23 100644
--- a/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetItemInfoHandler.h
+++ b/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetItemInfoHandler.h
@@ -46,13 +46,12 @@ class AppleGetItemInfoHandler {
   ~AppleGetItemInfoHandler();
 
   struct GetItemInfoReturnInfo {
-    lldb::addr_t item_buffer_ptr;  /* the address of the item buffer from
-                                      libBacktraceRecording */
-    lldb::addr_t item_buffer_size; /* the size of the item buffer from
+    lldb::addr_t item_buffer_ptr = LLDB_INVALID_ADDRESS; /* the address of the
+                                     item buffer from libBacktraceRecording */
+    lldb::addr_t item_buffer_size = 0; /* the size of the item buffer from
                                       libBacktraceRecording */
 
-    GetItemInfoReturnInfo()
-        : item_buffer_ptr(LLDB_INVALID_ADDRESS), item_buffer_size(0) {}
+    GetItemInfoReturnInfo() {}
   };
 
   /// Get the information about a work item by calling
diff --git a/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetPendingItemsHandler.h b/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetPendingItemsHandler.h
index 20895ca146c1e..c275800b87e6d 100644
--- a/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetPendingItemsHandler.h
+++ b/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetPendingItemsHandler.h
@@ -48,16 +48,16 @@ class AppleGetPendingItemsHandler {
   ~AppleGetPendingItemsHandler();
 
   struct GetPendingItemsReturnInfo {
-    lldb::addr_t items_buffer_ptr; /* the address of the pending items buffer
-                                      from libBacktraceRecording */
-    lldb::addr_t
-        items_buffer_size; /* the size of the pending items buffer from
-                              libBacktraceRecording */
-    uint64_t count; /* the number of pending items included in the buffer */
+    lldb::addr_t items_buffer_ptr =
+        LLDB_INVALID_ADDRESS; /* the address of the pending items buffer
+          from libBacktraceRecording */
+    lldb::addr_t items_buffer_size = 0; /* the size of the pending items buffer
+                                       from libBacktraceRecording */
+    uint64_t count = 0; /* the number of pending items included in the buffer */
 
     GetPendingItemsReturnInfo()
-        : items_buffer_ptr(LLDB_INVALID_ADDRESS), items_buffer_size(0),
-          count(0) {}
+
+    {}
   };
 
   /// Get the list of pending items for a given queue via a call to
diff --git a/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetQueuesHandler.h b/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetQueuesHandler.h
index 0c828d782a1ac..996e7b4b85662 100644
--- a/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetQueuesHandler.h
+++ b/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetQueuesHandler.h
@@ -45,15 +45,16 @@ class AppleGetQueuesHandler {
   ~AppleGetQueuesHandler();
 
   struct GetQueuesReturnInfo {
-    lldb::addr_t queues_buffer_ptr;  /* the address of the queues buffer from
+    lldb::addr_t queues_buffer_ptr =
+        LLDB_INVALID_ADDRESS; /* the address of the queues buffer from
+          libBacktraceRecording */
+    lldb::addr_t queues_buffer_size = 0; /* the size of the queues buffer from
                                         libBacktraceRecording */
-    lldb::addr_t queues_buffer_size; /* the size of the queues buffer from
-                                        libBacktraceRecording */
-    uint64_t count; /* the number of queues included in the queues buffer */
+    uint64_t count = 0; /* the number of queues included in the queues buffer */
 
     GetQueuesReturnInfo()
-        : queues_buffer_ptr(LLDB_INVALID_ADDRESS), queues_buffer_size(0),
-          count(0) {}
+
+    {}
   };
 
   /// Get the list of queues that exist (with any active or pending items) via
diff --git a/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetThreadItemInfoHandler.h b/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetThreadItemInfoHandler.h
index 0f7201a0e8100..9229e540a384b 100644
--- a/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetThreadItemInfoHandler.h
+++ b/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetThreadItemInfoHandler.h
@@ -47,13 +47,12 @@ class AppleGetThreadItemInfoHandler {
   ~AppleGetThreadItemInfoHandler();
 
   struct GetThreadItemInfoReturnInfo {
-    lldb::addr_t item_buffer_ptr;  /* the address of the item buffer from
-                                      libBacktraceRecording */
-    lldb::addr_t item_buffer_size; /* the size of the item buffer from
+    lldb::addr_t item_buffer_ptr = LLDB_INVALID_ADDRESS; /* the address of the
+                                     item buffer from libBacktraceRecording */
+    lldb::addr_t item_buffer_size = 0; /* the size of the item buffer from
                                       libBacktraceRecording */
 
-    GetThreadItemInfoReturnInfo()
-        : item_buffer_ptr(LLDB_INVALID_ADDRESS), item_buffer_size(0) {}
+    GetThreadItemInfoReturnInfo() {}
   };
 
   /// Get the information about a work item by calling
diff --git a/lldb/source/Plugins/SystemRuntime/MacOSX/SystemRuntimeMacOSX.h b/lldb/source/Plugins/SystemRuntime/MacOSX/SystemRuntimeMacOSX.h
index 844682e53ad94..c822c7beb4bfb 100644
--- a/lldb/source/Plugins/SystemRuntime/MacOSX/SystemRuntimeMacOSX.h
+++ b/lldb/source/Plugins/SystemRuntime/MacOSX/SystemRuntimeMacOSX.h
@@ -108,14 +108,12 @@ class SystemRuntimeMacOSX : public lldb_private::SystemRuntime {
 
 private:
   struct libBacktraceRecording_info {
-    uint16_t queue_info_version;
-    uint16_t queue_info_data_offset;
-    uint16_t item_info_version;
-    uint16_t item_info_data_offset;
-
-    libBacktraceRecording_info()
-        : queue_info_version(0), queue_info_data_offset(0),
-          item_info_version(0), item_info_data_offset(0) {}
+    uint16_t queue_info_version = 0;
+    uint16_t queue_info_data_offset = 0;
+    uint16_t item_info_version = 0;
+    uint16_t item_info_data_offset = 0;
+
+    libBacktraceRecording_info() {}
   };
 
   // A structure which reflects the data recorded in the
@@ -186,44 +184,39 @@ class SystemRuntimeMacOSX : public lldb_private::SystemRuntime {
   };
 
   struct LibdispatchVoucherOffsets {
-    uint16_t vo_version;
-    uint16_t vo_activity_ids_count;
-    uint16_t vo_activity_ids_count_size;
-    uint16_t vo_activity_ids_array;
-    uint16_t vo_activity_ids_array_entry_size;
+    uint16_t vo_version = UINT16_MAX;
+    uint16_t vo_activity_ids_count = UINT16_MAX;
+    uint16_t vo_activity_ids_count_size = UINT16_MAX;
+    uint16_t vo_activity_ids_array = UINT16_MAX;
+    uint16_t vo_activity_ids_array_entry_size = UINT16_MAX;
 
     LibdispatchVoucherOffsets()
-        : vo_version(UINT16_MAX), vo_activity_ids_count(UINT16_MAX),
-          vo_activity_ids_count_size(UINT16_MAX),
-          vo_activity_ids_array(UINT16_MAX),
-          vo_activity_ids_array_entry_size(UINT16_MAX) {}
+
+    {}
 
     bool IsValid() { return vo_version != UINT16_MAX; }
   };
 
   struct LibdispatchTSDIndexes {
-    uint16_t dti_version;
-    uint64_t dti_queue_index;
-    uint64_t dti_voucher_index;
-    uint64_t dti_qos_class_index;
+    uint16_t dti_version = UINT16_MAX;
+    uint64_t dti_queue_index = UINT64_MAX;
+    uint64_t dti_voucher_index = UINT64_MAX;
+    uint64_t dti_qos_class_index = UINT64_MAX;
 
-    LibdispatchTSDIndexes()
-        : dti_version(UINT16_MAX), dti_queue_index(UINT64_MAX),
-          dti_voucher_index(UINT64_MAX), dti_qos_class_index(UINT64_MAX) {}
+    LibdispatchTSDIndexes() {}
 
     bool IsValid() { return dti_version != UINT16_MAX; }
   };
 
   struct LibpthreadOffsets {
-    uint16_t plo_version;
-    uint16_t plo_pthread_tsd_base_offset;
-    uint16_t plo_pthread_tsd_base_address_offset;
-    uint16_t plo_pthread_tsd_entry_size;
+    uint16_t plo_version = UINT16_MAX;
+    uint16_t plo_pthread_tsd_base_offset = UINT16_MAX;
+    uint16_t plo_pthread_tsd_base_address_offset = UINT16_MAX;
+    uint16_t plo_pthread_tsd_entry_size = UINT16_MAX;
 
     LibpthreadOffsets()
-        : plo_version(UINT16_MAX), plo_pthread_tsd_base_offset(UINT16_MAX),
-          plo_pthread_tsd_base_address_offset(UINT16_MAX),
-          plo_pthread_tsd_entry_size(UINT16_MAX) {}
+
+    {}
 
     bool IsValid() { return plo_version != UINT16_MAX; }
   };
diff --git a/lldb/source/Plugins/UnwindAssembly/x86/x86AssemblyInspectionEngine.h b/lldb/source/Plugins/UnwindAssembly/x86/x86AssemblyInspectionEngine.h
index f39dce1afaa68..ceb2047f7091c 100644
--- a/lldb/source/Plugins/UnwindAssembly/x86/x86AssemblyInspectionEngine.h
+++ b/lldb/source/Plugins/UnwindAssembly/x86/x86AssemblyInspectionEngine.h
@@ -45,9 +45,9 @@ class x86AssemblyInspectionEngine {
   /// are called.  This one takes a vector of register name and lldb
   /// register numbers.
   struct lldb_reg_info {
-    const char *name;
-    uint32_t lldb_regnum;
-    lldb_reg_info() : name(nullptr), lldb_regnum(LLDB_INVALID_REGNUM) {}
+    const char *name = nullptr;
+    uint32_t lldb_regnum = LLDB_INVALID_REGNUM;
+    lldb_reg_info() {}
   };
   void Initialize(std::vector<lldb_reg_info> &reg_info);
 
diff --git a/lldb/source/Symbol/LineEntry.cpp b/lldb/source/Symbol/LineEntry.cpp
index a3907f4dd9c03..58bf8509a9589 100644
--- a/lldb/source/Symbol/LineEntry.cpp
+++ b/lldb/source/Symbol/LineEntry.cpp
@@ -14,9 +14,8 @@
 using namespace lldb_private;
 
 LineEntry::LineEntry()
-    : range(), file(), line(LLDB_INVALID_LINE_NUMBER), column(0),
-      is_start_of_statement(0), is_start_of_basic_block(0), is_prologue_end(0),
-      is_epilogue_begin(0), is_terminal_entry(0) {}
+    : range(), file(), is_start_of_statement(0), is_start_of_basic_block(0),
+      is_prologue_end(0), is_epilogue_begin(0), is_terminal_entry(0) {}
 
 LineEntry::LineEntry(const lldb::SectionSP &section_sp,
                      lldb::addr_t section_offset, lldb::addr_t byte_size,
diff --git a/lldb/source/Symbol/Symbol.cpp b/lldb/source/Symbol/Symbol.cpp
index e6695c5008ea8..a25911d1734da 100644
--- a/lldb/source/Symbol/Symbol.cpp
+++ b/lldb/source/Symbol/Symbol.cpp
@@ -23,13 +23,12 @@ using namespace lldb;
 using namespace lldb_private;
 
 Symbol::Symbol()
-    : SymbolContextScope(), m_uid(UINT32_MAX), m_type_data(0),
-      m_type_data_resolved(false), m_is_synthetic(false), m_is_debug(false),
-      m_is_external(false), m_size_is_sibling(false),
+    : SymbolContextScope(), m_type_data_resolved(false), m_is_synthetic(false),
+      m_is_debug(false), m_is_external(false), m_size_is_sibling(false),
       m_size_is_synthesized(false), m_size_is_valid(false),
       m_demangled_is_synthesized(false), m_contains_linker_annotations(false),
-      m_is_weak(false), m_type(eSymbolTypeInvalid), m_mangled(), m_addr_range(),
-      m_flags() {}
+      m_is_weak(false), m_type(eSymbolTypeInvalid), m_mangled(),
+      m_addr_range() {}
 
 Symbol::Symbol(uint32_t symID, llvm::StringRef name, SymbolType type, bool external,
                bool is_debug, bool is_trampoline, bool is_artificial,
diff --git a/lldb/source/Symbol/SymbolContext.cpp b/lldb/source/Symbol/SymbolContext.cpp
index d20d6aa5a5d40..7703c9d9aa17d 100644
--- a/lldb/source/Symbol/SymbolContext.cpp
+++ b/lldb/source/Symbol/SymbolContext.cpp
@@ -26,9 +26,7 @@
 using namespace lldb;
 using namespace lldb_private;
 
-SymbolContext::SymbolContext()
-    : target_sp(), module_sp(), comp_unit(nullptr), function(nullptr),
-      block(nullptr), line_entry(), symbol(nullptr), variable(nullptr) {}
+SymbolContext::SymbolContext() : target_sp(), module_sp(), line_entry() {}
 
 SymbolContext::SymbolContext(const ModuleSP &m, CompileUnit *cu, Function *f,
                              Block *b, LineEntry *le, Symbol *s)
diff --git a/lldb/source/Symbol/Type.cpp b/lldb/source/Symbol/Type.cpp
index 78419704cfee6..5b4169d256d29 100644
--- a/lldb/source/Symbol/Type.cpp
+++ b/lldb/source/Symbol/Type.cpp
@@ -161,10 +161,8 @@ Type::Type(lldb::user_id_t uid, SymbolFile *symbol_file, ConstString name,
 }
 
 Type::Type()
-    : std::enable_shared_from_this<Type>(), UserID(0), m_name("<INVALID TYPE>"),
-      m_symbol_file(nullptr), m_context(nullptr), m_encoding_type(nullptr),
-      m_encoding_uid(LLDB_INVALID_UID), m_encoding_uid_type(eEncodingInvalid),
-      m_compiler_type_resolve_state(ResolveState::Unresolved) {
+    : std::enable_shared_from_this<Type>(), UserID(0),
+      m_name("<INVALID TYPE>") {
   m_byte_size = 0;
   m_byte_size_has_value = false;
 }
diff --git a/lldb/source/Symbol/TypeSystem.cpp b/lldb/source/Symbol/TypeSystem.cpp
index 2adf36fa82761..52ab359bad383 100644
--- a/lldb/source/Symbol/TypeSystem.cpp
+++ b/lldb/source/Symbol/TypeSystem.cpp
@@ -178,8 +178,7 @@ TypeSystem::CreateUtilityFunction(std::string text, std::string name) {
 
 #pragma mark TypeSystemMap
 
-TypeSystemMap::TypeSystemMap()
-    : m_mutex(), m_map(), m_clear_in_progress(false) {}
+TypeSystemMap::TypeSystemMap() : m_mutex(), m_map() {}
 
 TypeSystemMap::~TypeSystemMap() {}
 
diff --git a/lldb/source/Symbol/UnwindPlan.cpp b/lldb/source/Symbol/UnwindPlan.cpp
index d74c78f084afa..41bd8cd46ad83 100644
--- a/lldb/source/Symbol/UnwindPlan.cpp
+++ b/lldb/source/Symbol/UnwindPlan.cpp
@@ -245,9 +245,7 @@ void UnwindPlan::Row::Dump(Stream &s, const UnwindPlan *unwind_plan,
   }
 }
 
-UnwindPlan::Row::Row()
-    : m_offset(0), m_cfa_value(), m_afa_value(), m_register_locations(),
-      m_unspecified_registers_are_undefined(false) {}
+UnwindPlan::Row::Row() : m_cfa_value(), m_afa_value(), m_register_locations() {}
 
 bool UnwindPlan::Row::GetRegisterInfo(
     uint32_t reg_num,
diff --git a/lldb/source/Target/ExecutionContext.cpp b/lldb/source/Target/ExecutionContext.cpp
index 20932ee63dce2..b5cf13582af1c 100644
--- a/lldb/source/Target/ExecutionContext.cpp
+++ b/lldb/source/Target/ExecutionContext.cpp
@@ -395,8 +395,7 @@ bool ExecutionContext::HasFrameScope() const {
 }
 
 ExecutionContextRef::ExecutionContextRef()
-    : m_target_wp(), m_process_wp(), m_thread_wp(),
-      m_tid(LLDB_INVALID_THREAD_ID), m_stack_id() {}
+    : m_target_wp(), m_process_wp(), m_thread_wp(), m_stack_id() {}
 
 ExecutionContextRef::ExecutionContextRef(const ExecutionContext *exe_ctx)
     : m_target_wp(), m_process_wp(), m_thread_wp(),
diff --git a/lldb/source/Target/PathMappingList.cpp b/lldb/source/Target/PathMappingList.cpp
index b22673f554712..35e0c74fb97c0 100644
--- a/lldb/source/Target/PathMappingList.cpp
+++ b/lldb/source/Target/PathMappingList.cpp
@@ -37,8 +37,7 @@ namespace {
   }
 }
 // PathMappingList constructor
-PathMappingList::PathMappingList()
-    : m_pairs(), m_callback(nullptr), m_callback_baton(nullptr), m_mod_id(0) {}
+PathMappingList::PathMappingList() : m_pairs() {}
 
 PathMappingList::PathMappingList(ChangedCallback callback, void *callback_baton)
     : m_pairs(), m_callback(callback), m_callback_baton(callback_baton),
diff --git a/lldb/source/Target/Process.cpp b/lldb/source/Target/Process.cpp
index 2c5b5d8ffae48..1449501fbe911 100644
--- a/lldb/source/Target/Process.cpp
+++ b/lldb/source/Target/Process.cpp
@@ -3843,9 +3843,7 @@ thread_result_t Process::RunPrivateStateThread(bool is_secondary_thread) {
 
 // Process Event Data
 
-Process::ProcessEventData::ProcessEventData()
-    : EventData(), m_process_wp(), m_state(eStateInvalid), m_restarted(false),
-      m_update_state(0), m_interrupted(false) {}
+Process::ProcessEventData::ProcessEventData() : EventData(), m_process_wp() {}
 
 Process::ProcessEventData::ProcessEventData(const ProcessSP &process_sp,
                                             StateType state)
diff --git a/lldb/source/Target/RegisterNumber.cpp b/lldb/source/Target/RegisterNumber.cpp
index 0ea9f212c6934..e5610bf588543 100644
--- a/lldb/source/Target/RegisterNumber.cpp
+++ b/lldb/source/Target/RegisterNumber.cpp
@@ -26,9 +26,7 @@ RegisterNumber::RegisterNumber(lldb_private::Thread &thread,
   }
 }
 
-RegisterNumber::RegisterNumber()
-    : m_reg_ctx_sp(), m_regnum(LLDB_INVALID_REGNUM),
-      m_kind(lldb::kNumRegisterKinds), m_kind_regnum_map(), m_name(nullptr) {}
+RegisterNumber::RegisterNumber() : m_reg_ctx_sp(), m_kind_regnum_map() {}
 
 void RegisterNumber::init(lldb_private::Thread &thread, lldb::RegisterKind kind,
                           uint32_t num) {
diff --git a/lldb/source/Target/ThreadSpec.cpp b/lldb/source/Target/ThreadSpec.cpp
index 1f6639379c45b..ba4c3aa894553 100644
--- a/lldb/source/Target/ThreadSpec.cpp
+++ b/lldb/source/Target/ThreadSpec.cpp
@@ -17,9 +17,7 @@ const char *ThreadSpec::g_option_names[static_cast<uint32_t>(
     ThreadSpec::OptionNames::LastOptionName)]{"Index", "ID", "Name",
                                               "QueueName"};
 
-ThreadSpec::ThreadSpec()
-    : m_index(UINT32_MAX), m_tid(LLDB_INVALID_THREAD_ID), m_name(),
-      m_queue_name() {}
+ThreadSpec::ThreadSpec() : m_name(), m_queue_name() {}
 
 std::unique_ptr<ThreadSpec> ThreadSpec::CreateFromStructuredData(
     const StructuredData::Dictionary &spec_dict, Status &error) {
diff --git a/lldb/source/Utility/DataEncoder.cpp b/lldb/source/Utility/DataEncoder.cpp
index 9c8f10d8c142a..e88cd23c1d84f 100644
--- a/lldb/source/Utility/DataEncoder.cpp
+++ b/lldb/source/Utility/DataEncoder.cpp
@@ -24,8 +24,7 @@ using namespace llvm::support::endian;
 
 // Default constructor.
 DataEncoder::DataEncoder()
-    : m_start(nullptr), m_end(nullptr),
-      m_byte_order(endian::InlHostByteOrder()), m_addr_size(sizeof(void *)),
+    : m_byte_order(endian::InlHostByteOrder()), m_addr_size(sizeof(void *)),
       m_data_sp() {}
 
 // This constructor allows us to use data that is owned by someone else. The
diff --git a/lldb/source/Utility/DataExtractor.cpp b/lldb/source/Utility/DataExtractor.cpp
index b31f44c8f7f9c..bdd79fd9b4112 100644
--- a/lldb/source/Utility/DataExtractor.cpp
+++ b/lldb/source/Utility/DataExtractor.cpp
@@ -120,9 +120,8 @@ static inline uint64_t ReadMaxInt64(const uint8_t *data, size_t byte_size,
 }
 
 DataExtractor::DataExtractor()
-    : m_start(nullptr), m_end(nullptr),
-      m_byte_order(endian::InlHostByteOrder()), m_addr_size(sizeof(void *)),
-      m_data_sp(), m_target_byte_size(1) {}
+    : m_byte_order(endian::InlHostByteOrder()), m_addr_size(sizeof(void *)),
+      m_data_sp() {}
 
 // This constructor allows us to use data that is owned by someone else. The
 // data must stay around as long as this object is valid.
diff --git a/lldb/source/Utility/ProcessInfo.cpp b/lldb/source/Utility/ProcessInfo.cpp
index 310d2b22b1744..c9759bbe513e6 100644
--- a/lldb/source/Utility/ProcessInfo.cpp
+++ b/lldb/source/Utility/ProcessInfo.cpp
@@ -22,8 +22,7 @@ using namespace lldb_private;
 using namespace lldb_private::repro;
 
 ProcessInfo::ProcessInfo()
-    : m_executable(), m_arguments(), m_environment(), m_uid(UINT32_MAX),
-      m_gid(UINT32_MAX), m_arch(), m_pid(LLDB_INVALID_PROCESS_ID) {}
+    : m_executable(), m_arguments(), m_environment(), m_arch() {}
 
 ProcessInfo::ProcessInfo(const char *name, const ArchSpec &arch,
                          lldb::pid_t pid)
diff --git a/lldb/source/Utility/ReproducerInstrumentation.cpp b/lldb/source/Utility/ReproducerInstrumentation.cpp
index 6b729dacb6e0a..e5bd2ba4b6259 100644
--- a/lldb/source/Utility/ReproducerInstrumentation.cpp
+++ b/lldb/source/Utility/ReproducerInstrumentation.cpp
@@ -193,8 +193,8 @@ unsigned ObjectToIndex::GetIndexForObjectImpl(const void *object) {
 }
 
 Recorder::Recorder()
-    : m_serializer(nullptr), m_pretty_func(), m_pretty_args(),
-      m_local_boundary(false), m_result_recorded(true),
+    : m_pretty_func(), m_pretty_args(),
+
       m_sequence(std::numeric_limits<unsigned>::max()) {
   if (!g_global_boundary) {
     g_global_boundary = true;
diff --git a/lldb/source/Utility/Status.cpp b/lldb/source/Utility/Status.cpp
index 02e2697488680..72fd087decc06 100644
--- a/lldb/source/Utility/Status.cpp
+++ b/lldb/source/Utility/Status.cpp
@@ -37,7 +37,7 @@ class raw_ostream;
 using namespace lldb;
 using namespace lldb_private;
 
-Status::Status() : m_code(0), m_type(eErrorTypeInvalid), m_string() {}
+Status::Status() : m_string() {}
 
 Status::Status(ValueType err, ErrorType type)
     : m_code(err), m_type(type), m_string() {}
diff --git a/lldb/source/Utility/Stream.cpp b/lldb/source/Utility/Stream.cpp
index ea9c2dabdfa73..effe69dcca527 100644
--- a/lldb/source/Utility/Stream.cpp
+++ b/lldb/source/Utility/Stream.cpp
@@ -28,8 +28,8 @@ Stream::Stream(uint32_t flags, uint32_t addr_size, ByteOrder byte_order,
       m_indent_level(0), m_forwarder(*this, colors) {}
 
 Stream::Stream(bool colors)
-    : m_flags(0), m_addr_size(4), m_byte_order(endian::InlHostByteOrder()),
-      m_indent_level(0), m_forwarder(*this, colors) {}
+    : m_flags(0), m_byte_order(endian::InlHostByteOrder()),
+      m_forwarder(*this, colors) {}
 
 // Destructor
 Stream::~Stream() {}
diff --git a/lldb/source/Utility/StringExtractor.cpp b/lldb/source/Utility/StringExtractor.cpp
index f5d3577c4a9cb..9ebd2c94eb2fc 100644
--- a/lldb/source/Utility/StringExtractor.cpp
+++ b/lldb/source/Utility/StringExtractor.cpp
@@ -26,7 +26,7 @@ static inline int xdigit_to_sint(char ch) {
 }
 
 // StringExtractor constructor
-StringExtractor::StringExtractor() : m_packet(), m_index(0) {}
+StringExtractor::StringExtractor() : m_packet() {}
 
 StringExtractor::StringExtractor(llvm::StringRef packet_str)
     : m_packet(), m_index(0) {