Re: [Mingw-w64-public] How to fix linking error due to missing IIDs from dbgeng?

[Biswapriyo Nath]

Oops, forgot to add the sample test file.

// 
https://github.com/openjdk/jdk/blob/master/src/jdk.hotspot.agent/windows/native/libsaproc/sawindbg.cpp

#include <inttypes.h>
#include <limits.h>
#include <stdio.h>
#include <windows.h>

#define DEBUG_NO_IMPLEMENTATION
#include <dbgeng.h>
#include <dbghelp.h>

#define COM_VERIFY_OK_(v, str, retValue) \
  do { \
    const HRESULT hr = (v); \
    if (hr != S_OK) { \
        printf("%s (hr: 0x%08X)", str, hr); \
      } \
  } while (false)

// class for IDebugOutputCallbacks

class SAOutputCallbacks : public IDebugOutputCallbacks {
  LONG  m_refCount;
  char* m_msgBuffer;

public:
  SAOutputCallbacks() : m_refCount(1), m_msgBuffer(nullptr) {
  }

  ~SAOutputCallbacks() {
    clearBuffer();
  }

  const char* getBuffer() const {
    return m_msgBuffer;
  }

  void clearBuffer() {
    if (m_msgBuffer) {
      free(m_msgBuffer);
      m_msgBuffer = 0;
    }
  }

  STDMETHOD_(ULONG, AddRef)(THIS);
  STDMETHOD_(ULONG, Release)(THIS);
  STDMETHOD(QueryInterface)(THIS_
                            IN REFIID interfaceId,
                            OUT PVOID* ppInterface);
  STDMETHOD(Output)(THIS_
                    IN ULONG mask,
                    IN PCSTR msg);
};

STDMETHODIMP_(ULONG) SAOutputCallbacks::AddRef(THIS) {
  return InterlockedIncrement(&m_refCount);
}

STDMETHODIMP_(ULONG) SAOutputCallbacks::Release(THIS) {
  LONG retVal = InterlockedDecrement(&m_refCount);
  if (retVal == 0) {
    delete this;
  }
  return retVal;
}

STDMETHODIMP SAOutputCallbacks::QueryInterface(THIS_
                                          IN REFIID interfaceId,
                                          OUT PVOID* ppInterface) {
  *ppInterface = nullptr;
  if (IsEqualIID(interfaceId, __uuidof(IUnknown)) ||
      IsEqualIID(interfaceId, __uuidof(IDebugOutputCallbacks))) {
    *ppInterface = static_cast<IDebugOutputCallbacks*>(this);
  } else {
    return E_NOINTERFACE;
  }
  AddRef();
  return S_OK;
}

STDMETHODIMP SAOutputCallbacks::Output(THIS_
                                       IN ULONG mask,
                                       IN PCSTR msg) {
  size_t len = strlen(msg) + 1;
  if (m_msgBuffer == 0) {
    m_msgBuffer = (char*) malloc(len);
    if (m_msgBuffer == 0) {
      fprintf(stderr, "out of memory debugger output!\n");
      return S_FALSE;
    }
    strcpy(m_msgBuffer, msg);
  } else {
    char* newBuffer = (char*)realloc(m_msgBuffer, len + strlen(m_msgBuffer));
    if (newBuffer == nullptr) {
      // old m_msgBuffer buffer is still valid
      fprintf(stderr, "out of memory debugger output!\n");
      return S_FALSE;
    }
    m_msgBuffer = newBuffer;
    strcat(m_msgBuffer, msg);
  }
  return S_OK;
}

static bool getWindbgInterfaces(void) {
  // get windbg interfaces ..

  IDebugClient* ptrIDebugClient = 0;
  COM_VERIFY_OK_(DebugCreate(__uuidof(IDebugClient), (PVOID*) &ptrIDebugClient),
                 "Windbg Error: not able to create IDebugClient object!", 
false);
  //env->SetLongField(obj, ptrIDebugClient_ID, (jlong) ptrIDebugClient);

  IDebugControl* ptrIDebugControl = 0;
  COM_VERIFY_OK_(ptrIDebugClient->QueryInterface(
                    __uuidof(IDebugControl), (PVOID*) &ptrIDebugControl),
                 "Windbg Error: not able to get IDebugControl", false);
  //env->SetLongField(obj, ptrIDebugControl_ID, (jlong) ptrIDebugControl);

  IDebugDataSpaces* ptrIDebugDataSpaces = 0;
  COM_VERIFY_OK_(ptrIDebugClient->QueryInterface(
                    __uuidof(IDebugDataSpaces), (PVOID*) &ptrIDebugDataSpaces),
                 "Windbg Error: not able to get IDebugDataSpaces object!", 
false);
  //env->SetLongField(obj, ptrIDebugDataSpaces_ID, (jlong) ptrIDebugDataSpaces);

  SAOutputCallbacks* ptrIDebugOutputCallbacks = new SAOutputCallbacks();
  //env->SetLongField(obj, ptrIDebugOutputCallbacks_ID, (jlong) 
ptrIDebugOutputCallbacks);
  //CHECK_EXCEPTION_(false);

  IDebugAdvanced* ptrIDebugAdvanced = 0;
  COM_VERIFY_OK_(ptrIDebugClient->QueryInterface(
                    __uuidof(IDebugAdvanced), (PVOID*) &ptrIDebugAdvanced),
                 "Windbg Error: not able to get IDebugAdvanced object!", false);
  //env->SetLongField(obj, ptrIDebugAdvanced_ID, (jlong) ptrIDebugAdvanced);

  IDebugSymbols* ptrIDebugSymbols = 0;
  COM_VERIFY_OK_(ptrIDebugClient->QueryInterface(
                    __uuidof(IDebugSymbols), (PVOID*) &ptrIDebugSymbols),
                 "Windbg Error: not able to get IDebugSymbols object!", false);
  //env->SetLongField(obj, ptrIDebugSymbols_ID, (jlong) ptrIDebugSymbols);

  IDebugSystemObjects* ptrIDebugSystemObjects = 0;
  COM_VERIFY_OK_(ptrIDebugClient->QueryInterface(
                    __uuidof(IDebugSystemObjects), (PVOID*) 
&ptrIDebugSystemObjects),
                 "Windbg Error: not able to get IDebugSystemObjects object!", 
false);
  //env->SetLongField(obj, ptrIDebugSystemObjects_ID, (jlong) 
ptrIDebugSystemObjects);

  return true;
}

int main()
{
    SAOutputCallbacks var;
    var.AddRef();
}


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