1 files changed, 82 insertions, 0 deletions
diff --git a/lldb/source/Plugins/Process/Utility/HistoryThread.cpp b/lldb/source/Plugins/Process/Utility/HistoryThread.cpp
new file mode 100644
index 000000000000..295c17e474fb
--- /dev/null
+++ b/lldb/source/Plugins/Process/Utility/HistoryThread.cpp
@@ -0,0 +1,82 @@
+//===-- HistoryThread.cpp ---------------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/lldb-private.h"
+
+#include "Plugins/Process/Utility/HistoryThread.h"
+
+#include "Plugins/Process/Utility/HistoryUnwind.h"
+#include "Plugins/Process/Utility/RegisterContextHistory.h"
+
+#include "lldb/Target/Process.h"
+#include "lldb/Target/StackFrameList.h"
+#include "lldb/Utility/Log.h"
+
+#include <memory>
+
+using namespace lldb;
+using namespace lldb_private;
+
+//  Constructor
+
+HistoryThread::HistoryThread(lldb_private::Process &process, lldb::tid_t tid,
+                             std::vector<lldb::addr_t> pcs)
+    : Thread(process, tid, true), m_framelist_mutex(), m_framelist(),
+      m_pcs(pcs), m_extended_unwind_token(LLDB_INVALID_ADDRESS), m_queue_name(),
+      m_thread_name(), m_originating_unique_thread_id(tid),
+      m_queue_id(LLDB_INVALID_QUEUE_ID) {
+  m_unwinder_up.reset(new HistoryUnwind(*this, pcs));
+  Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT));
+  LLDB_LOGF(log, "%p HistoryThread::HistoryThread", static_cast<void *>(this));
+}
+
+//  Destructor
+
+HistoryThread::~HistoryThread() {
+  Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT));
+  LLDB_LOGF(log, "%p HistoryThread::~HistoryThread (tid=0x%" PRIx64 ")",
+            static_cast<void *>(this), GetID());
+  DestroyThread();
+}
+
+lldb::RegisterContextSP HistoryThread::GetRegisterContext() {
+  RegisterContextSP rctx;
+  if (m_pcs.size() > 0) {
+    rctx = std::make_shared<RegisterContextHistory>(
+        *this, 0, GetProcess()->GetAddressByteSize(), m_pcs[0]);
+  }
+  return rctx;
+}
+
+lldb::RegisterContextSP
+HistoryThread::CreateRegisterContextForFrame(StackFrame *frame) {
+  return m_unwinder_up->CreateRegisterContextForFrame(frame);
+}
+
+lldb::StackFrameListSP HistoryThread::GetStackFrameList() {
+  // FIXME do not throw away the lock after we acquire it..
+  std::unique_lock<std::mutex> lock(m_framelist_mutex);
+  lock.unlock();
+  if (m_framelist.get() == nullptr) {
+    m_framelist =
+        std::make_shared<StackFrameList>(*this, StackFrameListSP(), true);
+  }
+
+  return m_framelist;
+}
+
+uint32_t HistoryThread::GetExtendedBacktraceOriginatingIndexID() {
+  if (m_originating_unique_thread_id != LLDB_INVALID_THREAD_ID) {
+    if (GetProcess()->HasAssignedIndexIDToThread(
+            m_originating_unique_thread_id)) {
+      return GetProcess()->AssignIndexIDToThread(
+          m_originating_unique_thread_id);
+    }
+  }
+  return LLDB_INVALID_THREAD_ID;
+}