2 files changed, 515 insertions, 0 deletions
diff --git a/contrib/llvm/tools/lldb/source/Plugins/OperatingSystem/Python/OperatingSystemPython.cpp b/contrib/llvm/tools/lldb/source/Plugins/OperatingSystem/Python/OperatingSystemPython.cpp
new file mode 100644
index 000000000000..14bf0784dc2c
--- /dev/null
+++ b/contrib/llvm/tools/lldb/source/Plugins/OperatingSystem/Python/OperatingSystemPython.cpp
@@ -0,0 +1,417 @@
+//===-- OperatingSystemPython.cpp --------------------------------*- C++-*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLDB_DISABLE_PYTHON
+
+#include "OperatingSystemPython.h"
+// C Includes
+// C++ Includes
+// Other libraries and framework includes
+#include "Plugins/Process/Utility/DynamicRegisterInfo.h"
+#include "Plugins/Process/Utility/RegisterContextDummy.h"
+#include "Plugins/Process/Utility/RegisterContextMemory.h"
+#include "Plugins/Process/Utility/ThreadMemory.h"
+#include "lldb/Core/ArchSpec.h"
+#include "lldb/Core/Debugger.h"
+#include "lldb/Core/Module.h"
+#include "lldb/Core/PluginManager.h"
+#include "lldb/Core/RegisterValue.h"
+#include "lldb/Core/StructuredData.h"
+#include "lldb/Core/ValueObjectVariable.h"
+#include "lldb/Interpreter/CommandInterpreter.h"
+#include "lldb/Interpreter/ScriptInterpreter.h"
+#include "lldb/Symbol/ObjectFile.h"
+#include "lldb/Symbol/VariableList.h"
+#include "lldb/Target/Process.h"
+#include "lldb/Target/StopInfo.h"
+#include "lldb/Target/Target.h"
+#include "lldb/Target/Thread.h"
+#include "lldb/Target/ThreadList.h"
+#include "lldb/Utility/DataBufferHeap.h"
+#include "lldb/Utility/StreamString.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+void OperatingSystemPython::Initialize() {
+  PluginManager::RegisterPlugin(GetPluginNameStatic(),
+                                GetPluginDescriptionStatic(), CreateInstance,
+                                nullptr);
+}
+
+void OperatingSystemPython::Terminate() {
+  PluginManager::UnregisterPlugin(CreateInstance);
+}
+
+OperatingSystem *OperatingSystemPython::CreateInstance(Process *process,
+                                                       bool force) {
+  // Python OperatingSystem plug-ins must be requested by name, so force must be
+  // true
+  FileSpec python_os_plugin_spec(process->GetPythonOSPluginPath());
+  if (python_os_plugin_spec && python_os_plugin_spec.Exists()) {
+    std::unique_ptr<OperatingSystemPython> os_ap(
+        new OperatingSystemPython(process, python_os_plugin_spec));
+    if (os_ap.get() && os_ap->IsValid())
+      return os_ap.release();
+  }
+  return NULL;
+}
+
+ConstString OperatingSystemPython::GetPluginNameStatic() {
+  static ConstString g_name("python");
+  return g_name;
+}
+
+const char *OperatingSystemPython::GetPluginDescriptionStatic() {
+  return "Operating system plug-in that gathers OS information from a python "
+         "class that implements the necessary OperatingSystem functionality.";
+}
+
+OperatingSystemPython::OperatingSystemPython(lldb_private::Process *process,
+                                             const FileSpec &python_module_path)
+    : OperatingSystem(process), m_thread_list_valobj_sp(), m_register_info_ap(),
+      m_interpreter(NULL), m_python_object_sp() {
+  if (!process)
+    return;
+  TargetSP target_sp = process->CalculateTarget();
+  if (!target_sp)
+    return;
+  m_interpreter =
+      target_sp->GetDebugger().GetCommandInterpreter().GetScriptInterpreter();
+  if (m_interpreter) {
+
+    std::string os_plugin_class_name(
+        python_module_path.GetFilename().AsCString(""));
+    if (!os_plugin_class_name.empty()) {
+      const bool init_session = false;
+      const bool allow_reload = true;
+      char python_module_path_cstr[PATH_MAX];
+      python_module_path.GetPath(python_module_path_cstr,
+                                 sizeof(python_module_path_cstr));
+      Status error;
+      if (m_interpreter->LoadScriptingModule(
+              python_module_path_cstr, allow_reload, init_session, error)) {
+        // Strip the ".py" extension if there is one
+        size_t py_extension_pos = os_plugin_class_name.rfind(".py");
+        if (py_extension_pos != std::string::npos)
+          os_plugin_class_name.erase(py_extension_pos);
+        // Add ".OperatingSystemPlugIn" to the module name to get a string like
+        // "modulename.OperatingSystemPlugIn"
+        os_plugin_class_name += ".OperatingSystemPlugIn";
+        StructuredData::ObjectSP object_sp =
+            m_interpreter->OSPlugin_CreatePluginObject(
+                os_plugin_class_name.c_str(), process->CalculateProcess());
+        if (object_sp && object_sp->IsValid())
+          m_python_object_sp = object_sp;
+      }
+    }
+  }
+}
+
+OperatingSystemPython::~OperatingSystemPython() {}
+
+DynamicRegisterInfo *OperatingSystemPython::GetDynamicRegisterInfo() {
+  if (m_register_info_ap.get() == NULL) {
+    if (!m_interpreter || !m_python_object_sp)
+      return NULL;
+    Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OS));
+
+    if (log)
+      log->Printf("OperatingSystemPython::GetDynamicRegisterInfo() fetching "
+                  "thread register definitions from python for pid %" PRIu64,
+                  m_process->GetID());
+
+    StructuredData::DictionarySP dictionary =
+        m_interpreter->OSPlugin_RegisterInfo(m_python_object_sp);
+    if (!dictionary)
+      return NULL;
+
+    m_register_info_ap.reset(new DynamicRegisterInfo(
+        *dictionary, m_process->GetTarget().GetArchitecture()));
+    assert(m_register_info_ap->GetNumRegisters() > 0);
+    assert(m_register_info_ap->GetNumRegisterSets() > 0);
+  }
+  return m_register_info_ap.get();
+}
+
+//------------------------------------------------------------------
+// PluginInterface protocol
+//------------------------------------------------------------------
+ConstString OperatingSystemPython::GetPluginName() {
+  return GetPluginNameStatic();
+}
+
+uint32_t OperatingSystemPython::GetPluginVersion() { return 1; }
+
+bool OperatingSystemPython::UpdateThreadList(ThreadList &old_thread_list,
+                                             ThreadList &core_thread_list,
+                                             ThreadList &new_thread_list) {
+  if (!m_interpreter || !m_python_object_sp)
+    return false;
+
+  Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OS));
+
+  // First thing we have to do is to try to get the API lock, and the run lock.
+  // We're going to change the thread content of the process, and we're going
+  // to use python, which requires the API lock to do it.
+  //
+  // If someone already has the API lock, that is ok, we just want to avoid
+  // external code from making new API calls while this call is happening.
+  //
+  // This is a recursive lock so we can grant it to any Python code called on
+  // the stack below us.
+  Target &target = m_process->GetTarget();
+  std::unique_lock<std::recursive_mutex> lock(target.GetAPIMutex(),
+                                              std::defer_lock);
+  lock.try_lock();
+
+  if (log)
+    log->Printf("OperatingSystemPython::UpdateThreadList() fetching thread "
+                "data from python for pid %" PRIu64,
+                m_process->GetID());
+
+  // The threads that are in "new_thread_list" upon entry are the threads from
+  // the
+  // lldb_private::Process subclass, no memory threads will be in this list.
+
+  auto interpreter_lock =
+      m_interpreter
+          ->AcquireInterpreterLock(); // to make sure threads_list stays alive
+  StructuredData::ArraySP threads_list =
+      m_interpreter->OSPlugin_ThreadsInfo(m_python_object_sp);
+
+  const uint32_t num_cores = core_thread_list.GetSize(false);
+
+  // Make a map so we can keep track of which cores were used from the
+  // core_thread list. Any real threads/cores that weren't used should
+  // later be put back into the "new_thread_list".
+  std::vector<bool> core_used_map(num_cores, false);
+  if (threads_list) {
+    if (log) {
+      StreamString strm;
+      threads_list->Dump(strm);
+      log->Printf("threads_list = %s", strm.GetData());
+    }
+
+    const uint32_t num_threads = threads_list->GetSize();
+    for (uint32_t i = 0; i < num_threads; ++i) {
+      StructuredData::ObjectSP thread_dict_obj =
+          threads_list->GetItemAtIndex(i);
+      if (auto thread_dict = thread_dict_obj->GetAsDictionary()) {
+        ThreadSP thread_sp(
+            CreateThreadFromThreadInfo(*thread_dict, core_thread_list,
+                                       old_thread_list, core_used_map, NULL));
+        if (thread_sp)
+          new_thread_list.AddThread(thread_sp);
+      }
+    }
+  }
+
+  // Any real core threads that didn't end up backing a memory thread should
+  // still be in the main thread list, and they should be inserted at the
+  // beginning
+  // of the list
+  uint32_t insert_idx = 0;
+  for (uint32_t core_idx = 0; core_idx < num_cores; ++core_idx) {
+    if (core_used_map[core_idx] == false) {
+      new_thread_list.InsertThread(
+          core_thread_list.GetThreadAtIndex(core_idx, false), insert_idx);
+      ++insert_idx;
+    }
+  }
+
+  return new_thread_list.GetSize(false) > 0;
+}
+
+ThreadSP OperatingSystemPython::CreateThreadFromThreadInfo(
+    StructuredData::Dictionary &thread_dict, ThreadList &core_thread_list,
+    ThreadList &old_thread_list, std::vector<bool> &core_used_map,
+    bool *did_create_ptr) {
+  ThreadSP thread_sp;
+  tid_t tid = LLDB_INVALID_THREAD_ID;
+  if (!thread_dict.GetValueForKeyAsInteger("tid", tid))
+    return ThreadSP();
+
+  uint32_t core_number;
+  addr_t reg_data_addr;
+  llvm::StringRef name;
+  llvm::StringRef queue;
+
+  thread_dict.GetValueForKeyAsInteger("core", core_number, UINT32_MAX);
+  thread_dict.GetValueForKeyAsInteger("register_data_addr", reg_data_addr,
+                                      LLDB_INVALID_ADDRESS);
+  thread_dict.GetValueForKeyAsString("name", name);
+  thread_dict.GetValueForKeyAsString("queue", queue);
+
+  // See if a thread already exists for "tid"
+  thread_sp = old_thread_list.FindThreadByID(tid, false);
+  if (thread_sp) {
+    // A thread already does exist for "tid", make sure it was an operating
+    // system
+    // plug-in generated thread.
+    if (!IsOperatingSystemPluginThread(thread_sp)) {
+      // We have thread ID overlap between the protocol threads and the
+      // operating system threads, clear the thread so we create an
+      // operating system thread for this.
+      thread_sp.reset();
+    }
+  }
+
+  if (!thread_sp) {
+    if (did_create_ptr)
+      *did_create_ptr = true;
+    thread_sp.reset(
+        new ThreadMemory(*m_process, tid, name, queue, reg_data_addr));
+  }
+
+  if (core_number < core_thread_list.GetSize(false)) {
+    ThreadSP core_thread_sp(
+        core_thread_list.GetThreadAtIndex(core_number, false));
+    if (core_thread_sp) {
+      // Keep track of which cores were set as the backing thread for memory
+      // threads...
+      if (core_number < core_used_map.size())
+        core_used_map[core_number] = true;
+
+      ThreadSP backing_core_thread_sp(core_thread_sp->GetBackingThread());
+      if (backing_core_thread_sp) {
+        thread_sp->SetBackingThread(backing_core_thread_sp);
+      } else {
+        thread_sp->SetBackingThread(core_thread_sp);
+      }
+    }
+  }
+  return thread_sp;
+}
+
+void OperatingSystemPython::ThreadWasSelected(Thread *thread) {}
+
+RegisterContextSP
+OperatingSystemPython::CreateRegisterContextForThread(Thread *thread,
+                                                      addr_t reg_data_addr) {
+  RegisterContextSP reg_ctx_sp;
+  if (!m_interpreter || !m_python_object_sp || !thread)
+    return reg_ctx_sp;
+
+  if (!IsOperatingSystemPluginThread(thread->shared_from_this()))
+    return reg_ctx_sp;
+
+  // First thing we have to do is get the API lock, and the run lock.  We're
+  // going to change the thread
+  // content of the process, and we're going to use python, which requires the
+  // API lock to do it.
+  // So get & hold that.  This is a recursive lock so we can grant it to any
+  // Python code called on the stack below us.
+  Target &target = m_process->GetTarget();
+  std::lock_guard<std::recursive_mutex> guard(target.GetAPIMutex());
+
+  Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_THREAD));
+
+  auto lock =
+      m_interpreter
+          ->AcquireInterpreterLock(); // to make sure python objects stays alive
+  if (reg_data_addr != LLDB_INVALID_ADDRESS) {
+    // The registers data is in contiguous memory, just create the register
+    // context using the address provided
+    if (log)
+      log->Printf("OperatingSystemPython::CreateRegisterContextForThread (tid "
+                  "= 0x%" PRIx64 ", 0x%" PRIx64 ", reg_data_addr = 0x%" PRIx64
+                  ") creating memory register context",
+                  thread->GetID(), thread->GetProtocolID(), reg_data_addr);
+    reg_ctx_sp.reset(new RegisterContextMemory(
+        *thread, 0, *GetDynamicRegisterInfo(), reg_data_addr));
+  } else {
+    // No register data address is provided, query the python plug-in to let
+    // it make up the data as it sees fit
+    if (log)
+      log->Printf("OperatingSystemPython::CreateRegisterContextForThread (tid "
+                  "= 0x%" PRIx64 ", 0x%" PRIx64
+                  ") fetching register data from python",
+                  thread->GetID(), thread->GetProtocolID());
+
+    StructuredData::StringSP reg_context_data =
+        m_interpreter->OSPlugin_RegisterContextData(m_python_object_sp,
+                                                    thread->GetID());
+    if (reg_context_data) {
+      std::string value = reg_context_data->GetValue();
+      DataBufferSP data_sp(new DataBufferHeap(value.c_str(), value.length()));
+      if (data_sp->GetByteSize()) {
+        RegisterContextMemory *reg_ctx_memory = new RegisterContextMemory(
+            *thread, 0, *GetDynamicRegisterInfo(), LLDB_INVALID_ADDRESS);
+        if (reg_ctx_memory) {
+          reg_ctx_sp.reset(reg_ctx_memory);
+          reg_ctx_memory->SetAllRegisterData(data_sp);
+        }
+      }
+    }
+  }
+  // if we still have no register data, fallback on a dummy context to avoid
+  // crashing
+  if (!reg_ctx_sp) {
+    if (log)
+      log->Printf("OperatingSystemPython::CreateRegisterContextForThread (tid "
+                  "= 0x%" PRIx64 ") forcing a dummy register context",
+                  thread->GetID());
+    reg_ctx_sp.reset(new RegisterContextDummy(
+        *thread, 0, target.GetArchitecture().GetAddressByteSize()));
+  }
+  return reg_ctx_sp;
+}
+
+StopInfoSP
+OperatingSystemPython::CreateThreadStopReason(lldb_private::Thread *thread) {
+  // We should have gotten the thread stop info from the dictionary of data for
+  // the thread in the initial call to get_thread_info(), this should have been
+  // cached so we can return it here
+  StopInfoSP
+      stop_info_sp; //(StopInfo::CreateStopReasonWithSignal (*thread, SIGSTOP));
+  return stop_info_sp;
+}
+
+lldb::ThreadSP OperatingSystemPython::CreateThread(lldb::tid_t tid,
+                                                   addr_t context) {
+  Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_THREAD));
+
+  if (log)
+    log->Printf("OperatingSystemPython::CreateThread (tid = 0x%" PRIx64
+                ", context = 0x%" PRIx64 ") fetching register data from python",
+                tid, context);
+
+  if (m_interpreter && m_python_object_sp) {
+    // First thing we have to do is get the API lock, and the run lock.  We're
+    // going to change the thread
+    // content of the process, and we're going to use python, which requires the
+    // API lock to do it.
+    // So get & hold that.  This is a recursive lock so we can grant it to any
+    // Python code called on the stack below us.
+    Target &target = m_process->GetTarget();
+    std::lock_guard<std::recursive_mutex> guard(target.GetAPIMutex());
+
+    auto lock = m_interpreter->AcquireInterpreterLock(); // to make sure
+                                                         // thread_info_dict
+                                                         // stays alive
+    StructuredData::DictionarySP thread_info_dict =
+        m_interpreter->OSPlugin_CreateThread(m_python_object_sp, tid, context);
+    std::vector<bool> core_used_map;
+    if (thread_info_dict) {
+      ThreadList core_threads(m_process);
+      ThreadList &thread_list = m_process->GetThreadList();
+      bool did_create = false;
+      ThreadSP thread_sp(
+          CreateThreadFromThreadInfo(*thread_info_dict, core_threads,
+                                     thread_list, core_used_map, &did_create));
+      if (did_create)
+        thread_list.AddThread(thread_sp);
+      return thread_sp;
+    }
+  }
+  return ThreadSP();
+}
+
+#endif // #ifndef LLDB_DISABLE_PYTHON
diff --git a/contrib/llvm/tools/lldb/source/Plugins/OperatingSystem/Python/OperatingSystemPython.h b/contrib/llvm/tools/lldb/source/Plugins/OperatingSystem/Python/OperatingSystemPython.h
new file mode 100644
index 000000000000..1eec30ef38c7
--- /dev/null
+++ b/contrib/llvm/tools/lldb/source/Plugins/OperatingSystem/Python/OperatingSystemPython.h
@@ -0,0 +1,98 @@
+//===-- OperatingSystemPython.h ---------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef liblldb_OperatingSystemPython_h_
+#define liblldb_OperatingSystemPython_h_
+
+#ifndef LLDB_DISABLE_PYTHON
+
+// C Includes
+// C++ Includes
+// Other libraries and framework includes
+// Project includes
+#include "lldb/Core/StructuredData.h"
+#include "lldb/Target/OperatingSystem.h"
+
+class DynamicRegisterInfo;
+
+namespace lldb_private {
+class ScriptInterpreter;
+}
+
+class OperatingSystemPython : public lldb_private::OperatingSystem {
+public:
+  OperatingSystemPython(lldb_private::Process *process,
+                        const lldb_private::FileSpec &python_module_path);
+
+  ~OperatingSystemPython() override;
+
+  //------------------------------------------------------------------
+  // Static Functions
+  //------------------------------------------------------------------
+  static lldb_private::OperatingSystem *
+  CreateInstance(lldb_private::Process *process, bool force);
+
+  static void Initialize();
+
+  static void Terminate();
+
+  static lldb_private::ConstString GetPluginNameStatic();
+
+  static const char *GetPluginDescriptionStatic();
+
+  //------------------------------------------------------------------
+  // lldb_private::PluginInterface Methods
+  //------------------------------------------------------------------
+  lldb_private::ConstString GetPluginName() override;
+
+  uint32_t GetPluginVersion() override;
+
+  //------------------------------------------------------------------
+  // lldb_private::OperatingSystem Methods
+  //------------------------------------------------------------------
+  bool UpdateThreadList(lldb_private::ThreadList &old_thread_list,
+                        lldb_private::ThreadList &real_thread_list,
+                        lldb_private::ThreadList &new_thread_list) override;
+
+  void ThreadWasSelected(lldb_private::Thread *thread) override;
+
+  lldb::RegisterContextSP
+  CreateRegisterContextForThread(lldb_private::Thread *thread,
+                                 lldb::addr_t reg_data_addr) override;
+
+  lldb::StopInfoSP
+  CreateThreadStopReason(lldb_private::Thread *thread) override;
+
+  //------------------------------------------------------------------
+  // Method for lazy creation of threads on demand
+  //------------------------------------------------------------------
+  lldb::ThreadSP CreateThread(lldb::tid_t tid, lldb::addr_t context) override;
+
+protected:
+  bool IsValid() const {
+    return m_python_object_sp && m_python_object_sp->IsValid();
+  }
+
+  lldb::ThreadSP CreateThreadFromThreadInfo(
+      lldb_private::StructuredData::Dictionary &thread_dict,
+      lldb_private::ThreadList &core_thread_list,
+      lldb_private::ThreadList &old_thread_list,
+      std::vector<bool> &core_used_map, bool *did_create_ptr);
+
+  DynamicRegisterInfo *GetDynamicRegisterInfo();
+
+  lldb::ValueObjectSP m_thread_list_valobj_sp;
+  std::unique_ptr<DynamicRegisterInfo> m_register_info_ap;
+  lldb_private::ScriptInterpreter *m_interpreter;
+  lldb_private::StructuredData::ObjectSP m_python_object_sp;
+};
+
+#endif // LLDB_DISABLE_PYTHON
+
+#endif // liblldb_OperatingSystemPython_h_