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423 lines
16 KiB
423 lines
16 KiB
//===-- OperatingSystemPython.cpp -----------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Host/Config.h"
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#if LLDB_ENABLE_PYTHON
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#include "OperatingSystemPython.h"
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#include "Plugins/Process/Utility/DynamicRegisterInfo.h"
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#include "Plugins/Process/Utility/RegisterContextDummy.h"
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#include "Plugins/Process/Utility/RegisterContextMemory.h"
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#include "Plugins/Process/Utility/ThreadMemory.h"
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#include "lldb/Core/Debugger.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Core/PluginManager.h"
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#include "lldb/Core/ValueObjectVariable.h"
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#include "lldb/Interpreter/CommandInterpreter.h"
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#include "lldb/Interpreter/ScriptInterpreter.h"
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#include "lldb/Symbol/ObjectFile.h"
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#include "lldb/Symbol/VariableList.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/StopInfo.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Target/Thread.h"
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#include "lldb/Target/ThreadList.h"
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#include "lldb/Utility/DataBufferHeap.h"
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#include "lldb/Utility/RegisterValue.h"
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#include "lldb/Utility/StreamString.h"
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#include "lldb/Utility/StructuredData.h"
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#include <memory>
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using namespace lldb;
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using namespace lldb_private;
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LLDB_PLUGIN_DEFINE(OperatingSystemPython)
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void OperatingSystemPython::Initialize() {
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PluginManager::RegisterPlugin(GetPluginNameStatic(),
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GetPluginDescriptionStatic(), CreateInstance,
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nullptr);
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}
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void OperatingSystemPython::Terminate() {
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PluginManager::UnregisterPlugin(CreateInstance);
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}
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OperatingSystem *OperatingSystemPython::CreateInstance(Process *process,
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bool force) {
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// Python OperatingSystem plug-ins must be requested by name, so force must
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// be true
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FileSpec python_os_plugin_spec(process->GetPythonOSPluginPath());
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if (python_os_plugin_spec &&
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FileSystem::Instance().Exists(python_os_plugin_spec)) {
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std::unique_ptr<OperatingSystemPython> os_up(
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new OperatingSystemPython(process, python_os_plugin_spec));
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if (os_up.get() && os_up->IsValid())
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return os_up.release();
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}
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return nullptr;
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}
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ConstString OperatingSystemPython::GetPluginNameStatic() {
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static ConstString g_name("python");
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return g_name;
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}
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const char *OperatingSystemPython::GetPluginDescriptionStatic() {
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return "Operating system plug-in that gathers OS information from a python "
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"class that implements the necessary OperatingSystem functionality.";
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}
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OperatingSystemPython::OperatingSystemPython(lldb_private::Process *process,
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const FileSpec &python_module_path)
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: OperatingSystem(process), m_thread_list_valobj_sp(), m_register_info_up(),
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m_interpreter(nullptr), m_python_object_sp() {
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if (!process)
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return;
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TargetSP target_sp = process->CalculateTarget();
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if (!target_sp)
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return;
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m_interpreter = target_sp->GetDebugger().GetScriptInterpreter();
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if (m_interpreter) {
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std::string os_plugin_class_name(
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python_module_path.GetFilename().AsCString(""));
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if (!os_plugin_class_name.empty()) {
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const bool init_session = false;
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char python_module_path_cstr[PATH_MAX];
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python_module_path.GetPath(python_module_path_cstr,
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sizeof(python_module_path_cstr));
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Status error;
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if (m_interpreter->LoadScriptingModule(python_module_path_cstr,
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init_session, error)) {
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// Strip the ".py" extension if there is one
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size_t py_extension_pos = os_plugin_class_name.rfind(".py");
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if (py_extension_pos != std::string::npos)
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os_plugin_class_name.erase(py_extension_pos);
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// Add ".OperatingSystemPlugIn" to the module name to get a string like
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// "modulename.OperatingSystemPlugIn"
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os_plugin_class_name += ".OperatingSystemPlugIn";
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StructuredData::ObjectSP object_sp =
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m_interpreter->OSPlugin_CreatePluginObject(
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os_plugin_class_name.c_str(), process->CalculateProcess());
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if (object_sp && object_sp->IsValid())
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m_python_object_sp = object_sp;
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}
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}
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}
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}
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OperatingSystemPython::~OperatingSystemPython() {}
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DynamicRegisterInfo *OperatingSystemPython::GetDynamicRegisterInfo() {
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if (m_register_info_up == nullptr) {
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if (!m_interpreter || !m_python_object_sp)
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return nullptr;
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Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OS));
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LLDB_LOGF(log,
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"OperatingSystemPython::GetDynamicRegisterInfo() fetching "
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"thread register definitions from python for pid %" PRIu64,
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m_process->GetID());
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StructuredData::DictionarySP dictionary =
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m_interpreter->OSPlugin_RegisterInfo(m_python_object_sp);
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if (!dictionary)
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return nullptr;
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m_register_info_up = std::make_unique<DynamicRegisterInfo>(
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*dictionary, m_process->GetTarget().GetArchitecture());
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assert(m_register_info_up->GetNumRegisters() > 0);
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assert(m_register_info_up->GetNumRegisterSets() > 0);
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}
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return m_register_info_up.get();
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}
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// PluginInterface protocol
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ConstString OperatingSystemPython::GetPluginName() {
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return GetPluginNameStatic();
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}
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uint32_t OperatingSystemPython::GetPluginVersion() { return 1; }
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bool OperatingSystemPython::UpdateThreadList(ThreadList &old_thread_list,
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ThreadList &core_thread_list,
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ThreadList &new_thread_list) {
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if (!m_interpreter || !m_python_object_sp)
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return false;
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Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OS));
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// First thing we have to do is to try to get the API lock, and the
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// interpreter lock. We're going to change the thread content of the process,
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// and we're going to use python, which requires the API lock to do it. We
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// need the interpreter lock to make sure thread_info_dict stays alive.
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//
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// If someone already has the API lock, that is ok, we just want to avoid
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// external code from making new API calls while this call is happening.
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//
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// This is a recursive lock so we can grant it to any Python code called on
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// the stack below us.
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Target &target = m_process->GetTarget();
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std::unique_lock<std::recursive_mutex> api_lock(target.GetAPIMutex(),
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std::defer_lock);
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(void)api_lock.try_lock(); // See above.
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auto interpreter_lock = m_interpreter->AcquireInterpreterLock();
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LLDB_LOGF(log,
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"OperatingSystemPython::UpdateThreadList() fetching thread "
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"data from python for pid %" PRIu64,
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m_process->GetID());
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// The threads that are in "core_thread_list" upon entry are the threads from
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// the lldb_private::Process subclass, no memory threads will be in this
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// list.
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StructuredData::ArraySP threads_list =
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m_interpreter->OSPlugin_ThreadsInfo(m_python_object_sp);
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const uint32_t num_cores = core_thread_list.GetSize(false);
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// Make a map so we can keep track of which cores were used from the
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// core_thread list. Any real threads/cores that weren't used should later be
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// put back into the "new_thread_list".
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std::vector<bool> core_used_map(num_cores, false);
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if (threads_list) {
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if (log) {
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StreamString strm;
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threads_list->Dump(strm);
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LLDB_LOGF(log, "threads_list = %s", strm.GetData());
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}
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const uint32_t num_threads = threads_list->GetSize();
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for (uint32_t i = 0; i < num_threads; ++i) {
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StructuredData::ObjectSP thread_dict_obj =
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threads_list->GetItemAtIndex(i);
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if (auto thread_dict = thread_dict_obj->GetAsDictionary()) {
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ThreadSP thread_sp(CreateThreadFromThreadInfo(
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*thread_dict, core_thread_list, old_thread_list, core_used_map,
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nullptr));
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if (thread_sp)
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new_thread_list.AddThread(thread_sp);
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}
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}
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}
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// Any real core threads that didn't end up backing a memory thread should
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// still be in the main thread list, and they should be inserted at the
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// beginning of the list
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uint32_t insert_idx = 0;
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for (uint32_t core_idx = 0; core_idx < num_cores; ++core_idx) {
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if (!core_used_map[core_idx]) {
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new_thread_list.InsertThread(
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core_thread_list.GetThreadAtIndex(core_idx, false), insert_idx);
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++insert_idx;
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}
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}
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return new_thread_list.GetSize(false) > 0;
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}
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ThreadSP OperatingSystemPython::CreateThreadFromThreadInfo(
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StructuredData::Dictionary &thread_dict, ThreadList &core_thread_list,
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ThreadList &old_thread_list, std::vector<bool> &core_used_map,
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bool *did_create_ptr) {
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ThreadSP thread_sp;
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tid_t tid = LLDB_INVALID_THREAD_ID;
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if (!thread_dict.GetValueForKeyAsInteger("tid", tid))
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return ThreadSP();
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uint32_t core_number;
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addr_t reg_data_addr;
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llvm::StringRef name;
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llvm::StringRef queue;
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thread_dict.GetValueForKeyAsInteger("core", core_number, UINT32_MAX);
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thread_dict.GetValueForKeyAsInteger("register_data_addr", reg_data_addr,
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LLDB_INVALID_ADDRESS);
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thread_dict.GetValueForKeyAsString("name", name);
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thread_dict.GetValueForKeyAsString("queue", queue);
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// See if a thread already exists for "tid"
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thread_sp = old_thread_list.FindThreadByID(tid, false);
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if (thread_sp) {
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// A thread already does exist for "tid", make sure it was an operating
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// system
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// plug-in generated thread.
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if (!IsOperatingSystemPluginThread(thread_sp)) {
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// We have thread ID overlap between the protocol threads and the
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// operating system threads, clear the thread so we create an operating
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// system thread for this.
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thread_sp.reset();
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}
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}
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if (!thread_sp) {
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if (did_create_ptr)
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*did_create_ptr = true;
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thread_sp = std::make_shared<ThreadMemory>(*m_process, tid, name, queue,
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reg_data_addr);
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}
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if (core_number < core_thread_list.GetSize(false)) {
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ThreadSP core_thread_sp(
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core_thread_list.GetThreadAtIndex(core_number, false));
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if (core_thread_sp) {
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// Keep track of which cores were set as the backing thread for memory
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// threads...
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if (core_number < core_used_map.size())
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core_used_map[core_number] = true;
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ThreadSP backing_core_thread_sp(core_thread_sp->GetBackingThread());
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if (backing_core_thread_sp) {
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thread_sp->SetBackingThread(backing_core_thread_sp);
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} else {
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thread_sp->SetBackingThread(core_thread_sp);
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}
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}
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}
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return thread_sp;
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}
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void OperatingSystemPython::ThreadWasSelected(Thread *thread) {}
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RegisterContextSP
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OperatingSystemPython::CreateRegisterContextForThread(Thread *thread,
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addr_t reg_data_addr) {
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RegisterContextSP reg_ctx_sp;
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if (!m_interpreter || !m_python_object_sp || !thread)
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return reg_ctx_sp;
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if (!IsOperatingSystemPluginThread(thread->shared_from_this()))
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return reg_ctx_sp;
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// First thing we have to do is to try to get the API lock, and the
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// interpreter lock. We're going to change the thread content of the process,
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// and we're going to use python, which requires the API lock to do it. We
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// need the interpreter lock to make sure thread_info_dict stays alive.
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//
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// If someone already has the API lock, that is ok, we just want to avoid
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// external code from making new API calls while this call is happening.
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//
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// This is a recursive lock so we can grant it to any Python code called on
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// the stack below us.
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Target &target = m_process->GetTarget();
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std::unique_lock<std::recursive_mutex> api_lock(target.GetAPIMutex(),
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std::defer_lock);
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(void)api_lock.try_lock(); // See above.
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auto interpreter_lock = m_interpreter->AcquireInterpreterLock();
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Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_THREAD));
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if (reg_data_addr != LLDB_INVALID_ADDRESS) {
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// The registers data is in contiguous memory, just create the register
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// context using the address provided
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LLDB_LOGF(log,
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"OperatingSystemPython::CreateRegisterContextForThread (tid "
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"= 0x%" PRIx64 ", 0x%" PRIx64 ", reg_data_addr = 0x%" PRIx64
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") creating memory register context",
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thread->GetID(), thread->GetProtocolID(), reg_data_addr);
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reg_ctx_sp = std::make_shared<RegisterContextMemory>(
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*thread, 0, *GetDynamicRegisterInfo(), reg_data_addr);
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} else {
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// No register data address is provided, query the python plug-in to let it
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// make up the data as it sees fit
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LLDB_LOGF(log,
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"OperatingSystemPython::CreateRegisterContextForThread (tid "
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"= 0x%" PRIx64 ", 0x%" PRIx64
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") fetching register data from python",
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thread->GetID(), thread->GetProtocolID());
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StructuredData::StringSP reg_context_data =
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m_interpreter->OSPlugin_RegisterContextData(m_python_object_sp,
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thread->GetID());
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if (reg_context_data) {
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std::string value = std::string(reg_context_data->GetValue());
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DataBufferSP data_sp(new DataBufferHeap(value.c_str(), value.length()));
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if (data_sp->GetByteSize()) {
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RegisterContextMemory *reg_ctx_memory = new RegisterContextMemory(
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*thread, 0, *GetDynamicRegisterInfo(), LLDB_INVALID_ADDRESS);
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if (reg_ctx_memory) {
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reg_ctx_sp.reset(reg_ctx_memory);
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reg_ctx_memory->SetAllRegisterData(data_sp);
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}
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}
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}
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}
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// if we still have no register data, fallback on a dummy context to avoid
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// crashing
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if (!reg_ctx_sp) {
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LLDB_LOGF(log,
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"OperatingSystemPython::CreateRegisterContextForThread (tid "
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"= 0x%" PRIx64 ") forcing a dummy register context",
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thread->GetID());
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reg_ctx_sp = std::make_shared<RegisterContextDummy>(
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*thread, 0, target.GetArchitecture().GetAddressByteSize());
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}
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return reg_ctx_sp;
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}
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StopInfoSP
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OperatingSystemPython::CreateThreadStopReason(lldb_private::Thread *thread) {
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// We should have gotten the thread stop info from the dictionary of data for
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// the thread in the initial call to get_thread_info(), this should have been
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// cached so we can return it here
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StopInfoSP
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stop_info_sp; //(StopInfo::CreateStopReasonWithSignal (*thread, SIGSTOP));
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return stop_info_sp;
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}
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lldb::ThreadSP OperatingSystemPython::CreateThread(lldb::tid_t tid,
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addr_t context) {
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Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_THREAD));
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LLDB_LOGF(log,
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"OperatingSystemPython::CreateThread (tid = 0x%" PRIx64
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", context = 0x%" PRIx64 ") fetching register data from python",
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tid, context);
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if (m_interpreter && m_python_object_sp) {
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// First thing we have to do is to try to get the API lock, and the
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// interpreter lock. We're going to change the thread content of the
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// process, and we're going to use python, which requires the API lock to
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// do it. We need the interpreter lock to make sure thread_info_dict stays
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// alive.
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//
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// If someone already has the API lock, that is ok, we just want to avoid
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// external code from making new API calls while this call is happening.
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//
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// This is a recursive lock so we can grant it to any Python code called on
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// the stack below us.
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Target &target = m_process->GetTarget();
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std::unique_lock<std::recursive_mutex> api_lock(target.GetAPIMutex(),
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std::defer_lock);
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(void)api_lock.try_lock(); // See above.
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auto interpreter_lock = m_interpreter->AcquireInterpreterLock();
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StructuredData::DictionarySP thread_info_dict =
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m_interpreter->OSPlugin_CreateThread(m_python_object_sp, tid, context);
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std::vector<bool> core_used_map;
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if (thread_info_dict) {
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ThreadList core_threads(m_process);
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ThreadList &thread_list = m_process->GetThreadList();
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bool did_create = false;
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ThreadSP thread_sp(
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CreateThreadFromThreadInfo(*thread_info_dict, core_threads,
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thread_list, core_used_map, &did_create));
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if (did_create)
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thread_list.AddThread(thread_sp);
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return thread_sp;
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}
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}
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return ThreadSP();
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}
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#endif // #if LLDB_ENABLE_PYTHON
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