ExceptionRecord.h

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//===-- ExceptionRecord.h ---------------------------------------*- 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
//
//===----------------------------------------------------------------------===//
 
#ifndef liblldb_Plugins_Process_Windows_ExceptionRecord_H_
#define liblldb_Plugins_Process_Windows_ExceptionRecord_H_
 
#include "lldb/Host/windows/windows.h"
#include "lldb/lldb-forward.h"
#include <dbghelp.h>
 
#include <memory>
#include <vector>
 
namespace lldb_private {
 
// ExceptionRecord
//
// ExceptionRecord defines an interface which allows implementors to receive
// notification of events that happen in a debugged process.
class ExceptionRecord {
public:
  ExceptionRecord(const EXCEPTION_RECORD &record, lldb::tid_t thread_id) {
    // Notes about the `record.ExceptionRecord` field:
    // In the past, some code tried to parse the nested exception with it, but
    // in practice, that code just causes Access Violation. I suspect
    // `ExceptionRecord` here actually points to the address space of the
    // debuggee process. However, I did not manage to find any official or
    // unofficial reference that clarifies this point. If anyone would like to
    // reimplement this, please also keep in mind to check how this behaves when
    // debugging a WOW64 process. I suspect you may have to use the explicit
    // `EXCEPTION_RECORD32` and `EXCEPTION_RECORD64` structs.
    m_code = record.ExceptionCode;
    m_continuable = (record.ExceptionFlags == 0);
    m_exception_addr = reinterpret_cast<lldb::addr_t>(record.ExceptionAddress);
    m_thread_id = thread_id;
    m_arguments.assign(record.ExceptionInformation,
                       record.ExceptionInformation + record.NumberParameters);
  }
 
  // MINIDUMP_EXCEPTIONs are almost identical to EXCEPTION_RECORDs.
  ExceptionRecord(const MINIDUMP_EXCEPTION &record, lldb::tid_t thread_id)
      : m_code(record.ExceptionCode), m_continuable(record.ExceptionFlags == 0),
        m_exception_addr(static_cast<lldb::addr_t>(record.ExceptionAddress)),
        m_thread_id(thread_id),
        m_arguments(record.ExceptionInformation,
                    record.ExceptionInformation + record.NumberParameters) {}
 
  virtual ~ExceptionRecord() {}
 
  DWORD
  GetExceptionCode() const { return m_code; }
  bool IsContinuable() const { return m_continuable; }
  lldb::addr_t GetExceptionAddress() const { return m_exception_addr; }
 
  lldb::tid_t GetThreadID() const { return m_thread_id; }
 
  const std::vector<ULONG_PTR>& GetExceptionArguments() const { return m_arguments; }
 
private:
  DWORD m_code;
  bool m_continuable;
  lldb::addr_t m_exception_addr;
  lldb::tid_t m_thread_id;
  std::vector<ULONG_PTR> m_arguments;
};
}
 
#endif