diff --git a/lldb/source/Plugins/Process/POSIX/CMakeLists.txt b/lldb/source/Plugins/Process/POSIX/CMakeLists.txt
--- a/lldb/source/Plugins/Process/POSIX/CMakeLists.txt
+++ b/lldb/source/Plugins/Process/POSIX/CMakeLists.txt
@@ -1,7 +1,6 @@
 add_lldb_library(lldbPluginProcessPOSIX
   CrashReason.cpp
   NativeProcessELF.cpp
-  ProcessMessage.cpp
   ProcessPOSIXLog.cpp
 
   LINK_LIBS
diff --git a/lldb/source/Plugins/Process/POSIX/ProcessMessage.h b/lldb/source/Plugins/Process/POSIX/ProcessMessage.h
deleted file mode 100644
--- a/lldb/source/Plugins/Process/POSIX/ProcessMessage.h
+++ /dev/null
@@ -1,168 +0,0 @@
-//===-- ProcessMessage.h ----------------------------------------*- C++ -*-===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef liblldb_ProcessMessage_H_
-#define liblldb_ProcessMessage_H_
-
-#include "CrashReason.h"
-
-#include <cassert>
-#include <string>
-
-#include "lldb/lldb-defines.h"
-#include "lldb/lldb-types.h"
-
-class ProcessMessage {
-public:
-  /// The type of signal this message can correspond to.
-  enum Kind {
-    eInvalidMessage,
-    eAttachMessage,
-    eExitMessage,
-    eLimboMessage,
-    eSignalMessage,
-    eSignalDeliveredMessage,
-    eTraceMessage,
-    eBreakpointMessage,
-    eWatchpointMessage,
-    eCrashMessage,
-    eNewThreadMessage,
-    eExecMessage
-  };
-
-  ProcessMessage()
-      : m_tid(LLDB_INVALID_PROCESS_ID), m_kind(eInvalidMessage),
-        m_crash_reason(CrashReason::eInvalidCrashReason), m_status(0),
-        m_addr(0) {}
-
-  Kind GetKind() const { return m_kind; }
-
-  lldb::tid_t GetTID() const { return m_tid; }
-
-  /// Indicates that the process \p pid has successfully attached.
-  static ProcessMessage Attach(lldb::pid_t pid) {
-    return ProcessMessage(pid, eAttachMessage);
-  }
-
-  /// Indicates that the thread \p tid is about to exit with status \p status.
-  static ProcessMessage Limbo(lldb::tid_t tid, int status) {
-    return ProcessMessage(tid, eLimboMessage, status);
-  }
-
-  /// Indicates that the thread \p tid had the signal \p signum delivered.
-  static ProcessMessage Signal(lldb::tid_t tid, int signum) {
-    return ProcessMessage(tid, eSignalMessage, signum);
-  }
-
-  /// Indicates that a signal \p signum generated by the debugging process was
-  /// delivered to the thread \p tid.
-  static ProcessMessage SignalDelivered(lldb::tid_t tid, int signum) {
-    return ProcessMessage(tid, eSignalDeliveredMessage, signum);
-  }
-
-  /// Indicates that the thread \p tid encountered a trace point.
-  static ProcessMessage Trace(lldb::tid_t tid) {
-    return ProcessMessage(tid, eTraceMessage);
-  }
-
-  /// Indicates that the thread \p tid encountered a break point.
-  static ProcessMessage Break(lldb::tid_t tid) {
-    return ProcessMessage(tid, eBreakpointMessage);
-  }
-
-  static ProcessMessage Watch(lldb::tid_t tid, lldb::addr_t wp_addr) {
-    return ProcessMessage(tid, eWatchpointMessage, 0, wp_addr);
-  }
-
-  /// Indicates that the thread \p tid crashed.
-  static ProcessMessage Crash(lldb::pid_t pid, CrashReason reason, int signo,
-                              lldb::addr_t fault_addr) {
-    ProcessMessage message(pid, eCrashMessage, signo, fault_addr);
-    message.m_crash_reason = reason;
-    return message;
-  }
-
-  /// Indicates that the thread \p child_tid was spawned.
-  static ProcessMessage NewThread(lldb::tid_t parent_tid,
-                                  lldb::tid_t child_tid) {
-    return ProcessMessage(parent_tid, eNewThreadMessage, child_tid);
-  }
-
-  /// Indicates that the thread \p tid is about to exit with status \p status.
-  static ProcessMessage Exit(lldb::tid_t tid, int status) {
-    return ProcessMessage(tid, eExitMessage, status);
-  }
-
-  /// Indicates that the thread \p pid has exec'd.
-  static ProcessMessage Exec(lldb::tid_t tid) {
-    return ProcessMessage(tid, eExecMessage);
-  }
-
-  int GetExitStatus() const {
-    assert(GetKind() == eExitMessage || GetKind() == eLimboMessage);
-    return m_status;
-  }
-
-  int GetSignal() const {
-    assert(GetKind() == eSignalMessage || GetKind() == eCrashMessage ||
-           GetKind() == eSignalDeliveredMessage);
-    return m_status;
-  }
-
-  int GetStopStatus() const {
-    assert(GetKind() == eSignalMessage);
-    return m_status;
-  }
-
-  CrashReason GetCrashReason() const {
-    assert(GetKind() == eCrashMessage);
-    return m_crash_reason;
-  }
-
-  lldb::addr_t GetFaultAddress() const {
-    assert(GetKind() == eCrashMessage);
-    return m_addr;
-  }
-
-  lldb::addr_t GetHWAddress() const {
-    assert(GetKind() == eWatchpointMessage || GetKind() == eTraceMessage);
-    return m_addr;
-  }
-
-  lldb::tid_t GetChildTID() const {
-    assert(GetKind() == eNewThreadMessage);
-    return m_child_tid;
-  }
-
-  const char *PrintCrashReason() const;
-
-  const char *PrintKind() const;
-
-  static const char *PrintKind(Kind);
-
-private:
-  ProcessMessage(lldb::tid_t tid, Kind kind, int status = 0,
-                 lldb::addr_t addr = 0)
-      : m_tid(tid), m_kind(kind),
-        m_crash_reason(CrashReason::eInvalidCrashReason), m_status(status),
-        m_addr(addr), m_child_tid(0) {}
-
-  ProcessMessage(lldb::tid_t tid, Kind kind, lldb::tid_t child_tid)
-      : m_tid(tid), m_kind(kind),
-        m_crash_reason(CrashReason::eInvalidCrashReason), m_status(0),
-        m_addr(0), m_child_tid(child_tid) {}
-
-  lldb::tid_t m_tid;
-  Kind m_kind : 8;
-  CrashReason m_crash_reason;
-  int m_status;
-  lldb::addr_t m_addr;
-  lldb::tid_t m_child_tid;
-};
-
-#endif // #ifndef liblldb_ProcessMessage_H_
diff --git a/lldb/source/Plugins/Process/POSIX/ProcessMessage.cpp b/lldb/source/Plugins/Process/POSIX/ProcessMessage.cpp
deleted file mode 100644
--- a/lldb/source/Plugins/Process/POSIX/ProcessMessage.cpp
+++ /dev/null
@@ -1,61 +0,0 @@
-//===-- ProcessMessage.cpp ------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#include "ProcessMessage.h"
-
-using namespace lldb_private;
-
-const char *ProcessMessage::PrintCrashReason() const {
-  return CrashReasonAsString(m_crash_reason);
-}
-
-const char *ProcessMessage::PrintKind(Kind kind) {
-  const char *str = nullptr;
-
-  switch (kind) {
-  case eInvalidMessage:
-    str = "eInvalidMessage";
-    break;
-  case eAttachMessage:
-    str = "eAttachMessage";
-    break;
-  case eExitMessage:
-    str = "eExitMessage";
-    break;
-  case eLimboMessage:
-    str = "eLimboMessage";
-    break;
-  case eSignalMessage:
-    str = "eSignalMessage";
-    break;
-  case eSignalDeliveredMessage:
-    str = "eSignalDeliveredMessage";
-    break;
-  case eTraceMessage:
-    str = "eTraceMessage";
-    break;
-  case eBreakpointMessage:
-    str = "eBreakpointMessage";
-    break;
-  case eWatchpointMessage:
-    str = "eWatchpointMessage";
-    break;
-  case eCrashMessage:
-    str = "eCrashMessage";
-    break;
-  case eNewThreadMessage:
-    str = "eNewThreadMessage";
-    break;
-  case eExecMessage:
-    str = "eExecMessage";
-    break;
-  }
-  return str;
-}
-
-const char *ProcessMessage::PrintKind() const { return PrintKind(m_kind); }
diff --git a/llvm/utils/gn/secondary/lldb/source/Plugins/Process/POSIX/BUILD.gn b/llvm/utils/gn/secondary/lldb/source/Plugins/Process/POSIX/BUILD.gn
--- a/llvm/utils/gn/secondary/lldb/source/Plugins/Process/POSIX/BUILD.gn
+++ b/llvm/utils/gn/secondary/lldb/source/Plugins/Process/POSIX/BUILD.gn
@@ -12,7 +12,6 @@
   sources = [
     "CrashReason.cpp",
     "NativeProcessELF.cpp",
-    "ProcessMessage.cpp",
     "ProcessPOSIXLog.cpp",
   ]
 }