[trace] rename ThreadIntelPT into TraceTrace

Renamed ThreadIntelPT to TreaceThread, making it a top-level class. I noticed that this class can and shuld work for any trace plugin and there's nothing intel-pt specific in it.
With that TraceThread change, I was able to move most of the json file parsing logic to the base class TraceSessionFileParser, which makes adding new plug-ins easier.

This originally was part of https://reviews.llvm.org/D89283

Differential Revision: https://reviews.llvm.org/D89408

lldb/source/Target/ProcessTrace.cpp

@@ -0,0 +1,125 @@
+//===-- ProcessTrace.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 "lldb/Target/ProcessTrace.h"
+
+#include <memory>
+
+#include "lldb/Core/Module.h"
+#include "lldb/Core/PluginManager.h"
+#include "lldb/Target/Target.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+ConstString ProcessTrace::GetPluginNameStatic() {
+  static ConstString g_name("trace");
+  return g_name;
+}
+
+const char *ProcessTrace::GetPluginDescriptionStatic() {
+  return "Trace process plug-in.";
+}
+
+void ProcessTrace::Terminate() {
+  PluginManager::UnregisterPlugin(ProcessTrace::CreateInstance);
+}
+
+ProcessSP ProcessTrace::CreateInstance(TargetSP target_sp,
+                                       ListenerSP listener_sp,
+                                       const FileSpec *crash_file) {
+  return std::make_shared<ProcessTrace>(target_sp, listener_sp);
+}
+
+bool ProcessTrace::CanDebug(TargetSP target_sp, bool plugin_specified_by_name) {
+  return plugin_specified_by_name;
+}
+
+ProcessTrace::ProcessTrace(TargetSP target_sp, ListenerSP listener_sp)
+    : Process(target_sp, listener_sp) {}
+
+ProcessTrace::~ProcessTrace() {
+  Clear();
+  // We need to call finalize on the process before destroying ourselves to
+  // make sure all of the broadcaster cleanup goes as planned. If we destruct
+  // this class, then Process::~Process() might have problems trying to fully
+  // destroy the broadcaster.
+  Finalize();
+}
+
+ConstString ProcessTrace::GetPluginName() { return GetPluginNameStatic(); }
+
+uint32_t ProcessTrace::GetPluginVersion() { return 1; }
+
+void ProcessTrace::DidAttach(ArchSpec &process_arch) {
+  ListenerSP listener_sp(
+      Listener::MakeListener("lldb.process_trace.did_attach_listener"));
+  HijackProcessEvents(listener_sp);
+
+  SetCanJIT(false);
+  StartPrivateStateThread();
+  SetPrivateState(eStateStopped);
+
+  EventSP event_sp;
+  WaitForProcessToStop(llvm::None, &event_sp, true, listener_sp);
+
+  RestoreProcessEvents();
+
+  Process::DidAttach(process_arch);
+}
+
+bool ProcessTrace::UpdateThreadList(ThreadList &old_thread_list,
+                                    ThreadList &new_thread_list) {
+  return false;
+}
+
+void ProcessTrace::RefreshStateAfterStop() {}
+
+Status ProcessTrace::DoDestroy() { return Status(); }
+
+bool ProcessTrace::IsAlive() { return true; }
+
+size_t ProcessTrace::ReadMemory(addr_t addr, void *buf, size_t size,
+                                Status &error) {
+  // Don't allow the caching that lldb_private::Process::ReadMemory does since
+  // we have it all cached in the trace files.
+  return DoReadMemory(addr, buf, size, error);
+}
+
+void ProcessTrace::Clear() { m_thread_list.Clear(); }
+
+void ProcessTrace::Initialize() {
+  static llvm::once_flag g_once_flag;
+
+  llvm::call_once(g_once_flag, []() {
+    PluginManager::RegisterPlugin(GetPluginNameStatic(),
+                                  GetPluginDescriptionStatic(), CreateInstance);
+  });
+}
+
+ArchSpec ProcessTrace::GetArchitecture() {
+  return GetTarget().GetArchitecture();
+}
+
+bool ProcessTrace::GetProcessInfo(ProcessInstanceInfo &info) {
+  info.Clear();
+  info.SetProcessID(GetID());
+  info.SetArchitecture(GetArchitecture());
+  ModuleSP module_sp = GetTarget().GetExecutableModule();
+  if (module_sp) {
+    const bool add_exe_file_as_first_arg = false;
+    info.SetExecutableFile(GetTarget().GetExecutableModule()->GetFileSpec(),
+                           add_exe_file_as_first_arg);
+  }
+  return true;
+}
+
+size_t ProcessTrace::DoReadMemory(addr_t addr, void *buf, size_t size,
+                                  Status &error) {
+  return 0;
+}