src/llvm-project/lldb/source/Plugins/Process/minidump/ThreadMinidump.cpp

//===-- ThreadMinidump.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 "ThreadMinidump.h"

#include "ProcessMinidump.h"

#include "RegisterContextMinidump_ARM.h"
#include "RegisterContextMinidump_ARM64.h"
#include "RegisterContextMinidump_x86_32.h"
#include "RegisterContextMinidump_x86_64.h"

#include "Plugins/Process/Utility/RegisterContextLinux_i386.h"
#include "Plugins/Process/Utility/RegisterContextLinux_x86_64.h"
#include "Plugins/Process/elf-core/RegisterContextPOSIXCore_x86_64.h"
#include "Plugins/Process/elf-core/RegisterUtilities.h"

#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/StopInfo.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Unwind.h"
#include "lldb/Utility/DataExtractor.h"
#include "lldb/Utility/Log.h"

#include <memory>

using namespace lldb;
using namespace lldb_private;
using namespace minidump;

ThreadMinidump::ThreadMinidump(Process &process, const minidump::Thread &td,
                               llvm::ArrayRef<uint8_t> gpregset_data)
    : Thread(process, td.ThreadId), m_thread_reg_ctx_sp(),
      m_gpregset_data(gpregset_data) {}

ThreadMinidump::~ThreadMinidump() {}

void ThreadMinidump::RefreshStateAfterStop() {}

RegisterContextSP ThreadMinidump::GetRegisterContext() {
  if (!m_reg_context_sp) {
    m_reg_context_sp = CreateRegisterContextForFrame(nullptr);
  }
  return m_reg_context_sp;
}

RegisterContextSP
ThreadMinidump::CreateRegisterContextForFrame(StackFrame *frame) {
  RegisterContextSP reg_ctx_sp;
  uint32_t concrete_frame_idx = 0;

  if (frame)
    concrete_frame_idx = frame->GetConcreteFrameIndex();

  if (concrete_frame_idx == 0) {
    if (m_thread_reg_ctx_sp)
      return m_thread_reg_ctx_sp;

    ProcessMinidump *process =
        static_cast<ProcessMinidump *>(GetProcess().get());
    ArchSpec arch = process->GetArchitecture();
    RegisterInfoInterface *reg_interface = nullptr;

    // TODO write other register contexts and add them here
    switch (arch.GetMachine()) {
    case llvm::Triple::x86: {
      reg_interface = new RegisterContextLinux_i386(arch);
      lldb::DataBufferSP buf =
          ConvertMinidumpContext_x86_32(m_gpregset_data, reg_interface);
      DataExtractor gpregset(buf, lldb::eByteOrderLittle, 4);
      m_thread_reg_ctx_sp = std::make_shared<RegisterContextCorePOSIX_x86_64>(
          *this, reg_interface, gpregset,
          llvm::ArrayRef<lldb_private::CoreNote>());
      break;
    }
    case llvm::Triple::x86_64: {
      reg_interface = new RegisterContextLinux_x86_64(arch);
      lldb::DataBufferSP buf =
          ConvertMinidumpContext_x86_64(m_gpregset_data, reg_interface);
      DataExtractor gpregset(buf, lldb::eByteOrderLittle, 8);
      m_thread_reg_ctx_sp = std::make_shared<RegisterContextCorePOSIX_x86_64>(
          *this, reg_interface, gpregset,
          llvm::ArrayRef<lldb_private::CoreNote>());
      break;
    }
    case llvm::Triple::aarch64: {
      DataExtractor data(m_gpregset_data.data(), m_gpregset_data.size(),
                         lldb::eByteOrderLittle, 8);
      m_thread_reg_ctx_sp =
          std::make_shared<RegisterContextMinidump_ARM64>(*this, data);
      break;
    }
    case llvm::Triple::arm: {
      DataExtractor data(m_gpregset_data.data(), m_gpregset_data.size(),
                         lldb::eByteOrderLittle, 8);
      const bool apple = arch.GetTriple().getVendor() == llvm::Triple::Apple;
      m_thread_reg_ctx_sp =
          std::make_shared<RegisterContextMinidump_ARM>(*this, data, apple);
      break;
    }
    default:
      break;
    }

    reg_ctx_sp = m_thread_reg_ctx_sp;
  } else if (m_unwinder_up) {
    reg_ctx_sp = m_unwinder_up->CreateRegisterContextForFrame(frame);
  }

  return reg_ctx_sp;
}

bool ThreadMinidump::CalculateStopInfo() { return false; }