Adding upstream version 6.0.4-dfsg.upstream/6.0.4-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 526 insertions, 0 deletions

diff --git a/src/VBox/Runtime/common/dbg/dbgmoddbghelp.cpp b/src/VBox/Runtime/common/dbg/dbgmoddbghelp.cpp
new file mode 100644
index 00000000..e4834d5f
--- /dev/null
+++ b/src/VBox/Runtime/common/dbg/dbgmoddbghelp.cpp
@@ -0,0 +1,526 @@
+/* $Id: dbgmoddbghelp.cpp $ */
+/** @file
+ * IPRT - Debug Info Reader Using DbgHelp.dll if Present.
+ */
+
+/*
+ * Copyright (C) 2013-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP   RTLOGGROUP_DBG
+#include <iprt/dbg.h>
+#include "internal/iprt.h"
+
+#include <iprt/asm.h>
+#include <iprt/ctype.h>
+#include <iprt/err.h>
+#include <iprt/list.h>
+#include <iprt/log.h>
+#include <iprt/mem.h>
+#include <iprt/path.h>
+#include <iprt/string.h>
+#include <iprt/utf16.h>
+#include "internal/dbgmod.h"
+
+#include <iprt/win/windows.h>
+#include <Dbghelp.h>
+#include <iprt/win/lazy-dbghelp.h>
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/** For passing arguments to DbgHelp.dll callback. */
+typedef struct RTDBGMODBGHELPARGS
+{
+    RTDBGMOD        hCnt;
+    PRTDBGMODINT    pMod;
+    uint64_t        uModAddr;
+    RTLDRADDR       uNextRva;
+
+    /** UTF-8 version of the previous file name. */
+    char           *pszPrev;
+    /** Copy of the previous file name. */
+    PRTUTF16        pwszPrev;
+    /** Number of bytes pwszPrev points to. */
+    size_t          cbPrevUtf16Alloc;
+} RTDBGMODBGHELPARGS;
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnUnwindFrame} */
+static DECLCALLBACK(int) rtDbgModDbgHelp_UnwindFrame(PRTDBGMODINT pMod, RTDBGSEGIDX iSeg, RTUINTPTR off, PRTDBGUNWINDSTATE pState)
+{
+    RT_NOREF(pMod, iSeg, off, pState);
+    return VERR_DBG_NO_UNWIND_INFO;
+}
+
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnLineByAddr} */
+static DECLCALLBACK(int) rtDbgModDbgHelp_LineByAddr(PRTDBGMODINT pMod, RTDBGSEGIDX iSeg, RTUINTPTR off,
+                                                  PRTINTPTR poffDisp, PRTDBGLINE pLineInfo)
+{
+    RTDBGMOD hCnt = (RTDBGMOD)pMod->pvDbgPriv;
+    return RTDbgModLineByAddr(hCnt, iSeg, off, poffDisp, pLineInfo);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnLineByOrdinal} */
+static DECLCALLBACK(int) rtDbgModDbgHelp_LineByOrdinal(PRTDBGMODINT pMod, uint32_t iOrdinal, PRTDBGLINE pLineInfo)
+{
+    RTDBGMOD hCnt = (RTDBGMOD)pMod->pvDbgPriv;
+    return RTDbgModLineByOrdinal(hCnt, iOrdinal, pLineInfo);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnLineCount} */
+static DECLCALLBACK(uint32_t) rtDbgModDbgHelp_LineCount(PRTDBGMODINT pMod)
+{
+    RTDBGMOD hCnt = (RTDBGMOD)pMod->pvDbgPriv;
+    return RTDbgModLineCount(hCnt);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnLineAdd} */
+static DECLCALLBACK(int) rtDbgModDbgHelp_LineAdd(PRTDBGMODINT pMod, const char *pszFile, size_t cchFile, uint32_t uLineNo,
+                                                 uint32_t iSeg, RTUINTPTR off, uint32_t *piOrdinal)
+{
+    RTDBGMOD hCnt = (RTDBGMOD)pMod->pvDbgPriv;
+    Assert(!pszFile[cchFile]); NOREF(cchFile);
+    return RTDbgModLineAdd(hCnt, pszFile, uLineNo, iSeg, off, piOrdinal);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnSymbolByAddr} */
+static DECLCALLBACK(int) rtDbgModDbgHelp_SymbolByAddr(PRTDBGMODINT pMod, RTDBGSEGIDX iSeg, RTUINTPTR off, uint32_t fFlags,
+                                                      PRTINTPTR poffDisp, PRTDBGSYMBOL pSymInfo)
+{
+    RTDBGMOD hCnt = (RTDBGMOD)pMod->pvDbgPriv;
+    return RTDbgModSymbolByAddr(hCnt, iSeg, off, fFlags, poffDisp, pSymInfo);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnSymbolByName} */
+static DECLCALLBACK(int) rtDbgModDbgHelp_SymbolByName(PRTDBGMODINT pMod, const char *pszSymbol, size_t cchSymbol,
+                                                      PRTDBGSYMBOL pSymInfo)
+{
+    RTDBGMOD hCnt = (RTDBGMOD)pMod->pvDbgPriv;
+    Assert(!pszSymbol[cchSymbol]); RT_NOREF_PV(cchSymbol);
+    return RTDbgModSymbolByName(hCnt, pszSymbol/*, cchSymbol*/, pSymInfo);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnSymbolByOrdinal} */
+static DECLCALLBACK(int) rtDbgModDbgHelp_SymbolByOrdinal(PRTDBGMODINT pMod, uint32_t iOrdinal, PRTDBGSYMBOL pSymInfo)
+{
+    RTDBGMOD hCnt = (RTDBGMOD)pMod->pvDbgPriv;
+    return RTDbgModSymbolByOrdinal(hCnt, iOrdinal, pSymInfo);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnSymbolCount} */
+static DECLCALLBACK(uint32_t) rtDbgModDbgHelp_SymbolCount(PRTDBGMODINT pMod)
+{
+    RTDBGMOD hCnt = (RTDBGMOD)pMod->pvDbgPriv;
+    return RTDbgModSymbolCount(hCnt);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnSymbolAdd} */
+static DECLCALLBACK(int) rtDbgModDbgHelp_SymbolAdd(PRTDBGMODINT pMod, const char *pszSymbol, size_t cchSymbol,
+                                                   RTDBGSEGIDX iSeg, RTUINTPTR off, RTUINTPTR cb, uint32_t fFlags,
+                                                   uint32_t *piOrdinal)
+{
+    RTDBGMOD hCnt = (RTDBGMOD)pMod->pvDbgPriv;
+    Assert(!pszSymbol[cchSymbol]); NOREF(cchSymbol);
+    return RTDbgModSymbolAdd(hCnt, pszSymbol, iSeg, off, cb, fFlags, piOrdinal);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnSegmentByIndex} */
+static DECLCALLBACK(int) rtDbgModDbgHelp_SegmentByIndex(PRTDBGMODINT pMod, RTDBGSEGIDX iSeg, PRTDBGSEGMENT pSegInfo)
+{
+    RTDBGMOD hCnt = (RTDBGMOD)pMod->pvDbgPriv;
+    return RTDbgModSegmentByIndex(hCnt, iSeg, pSegInfo);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnSegmentCount} */
+static DECLCALLBACK(RTDBGSEGIDX) rtDbgModDbgHelp_SegmentCount(PRTDBGMODINT pMod)
+{
+    RTDBGMOD hCnt = (RTDBGMOD)pMod->pvDbgPriv;
+    return RTDbgModSegmentCount(hCnt);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnSegmentAdd} */
+static DECLCALLBACK(int) rtDbgModDbgHelp_SegmentAdd(PRTDBGMODINT pMod, RTUINTPTR uRva, RTUINTPTR cb, const char *pszName, size_t cchName,
+                                                    uint32_t fFlags, PRTDBGSEGIDX piSeg)
+{
+    RTDBGMOD hCnt = (RTDBGMOD)pMod->pvDbgPriv;
+    Assert(!pszName[cchName]); NOREF(cchName);
+    return RTDbgModSegmentAdd(hCnt, uRva, cb, pszName, fFlags, piSeg);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnImageSize} */
+static DECLCALLBACK(RTUINTPTR) rtDbgModDbgHelp_ImageSize(PRTDBGMODINT pMod)
+{
+    RTDBGMOD hCnt = (RTDBGMOD)pMod->pvDbgPriv;
+    RTUINTPTR cb1 = RTDbgModImageSize(hCnt);
+    RTUINTPTR cb2 = pMod->pImgVt->pfnImageSize(pMod);
+    return RT_MAX(cb1, cb2);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnRvaToSegOff} */
+static DECLCALLBACK(RTDBGSEGIDX) rtDbgModDbgHelp_RvaToSegOff(PRTDBGMODINT pMod, RTUINTPTR uRva, PRTUINTPTR poffSeg)
+{
+    RTDBGMOD hCnt = (RTDBGMOD)pMod->pvDbgPriv;
+    return RTDbgModRvaToSegOff(hCnt, uRva, poffSeg);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnClose} */
+static DECLCALLBACK(int) rtDbgModDbgHelp_Close(PRTDBGMODINT pMod)
+{
+    RTDBGMOD hCnt = (RTDBGMOD)pMod->pvDbgPriv;;
+    RTDbgModRelease(hCnt);
+    pMod->pvDbgPriv = NULL;
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * SymEnumLinesW callback that adds a line number to the container.
+ *
+ * @returns TRUE, FALSE if we're out of memory.
+ * @param   pLineInfo           Line number information.
+ * @param   pvUser              Pointer to a RTDBGMODBGHELPARGS structure.
+ */
+static BOOL CALLBACK rtDbgModDbgHelpCopyLineNumberCallback(PSRCCODEINFOW pLineInfo, PVOID pvUser)
+{
+    RTDBGMODBGHELPARGS *pArgs  = (RTDBGMODBGHELPARGS *)pvUser;
+
+    if (pLineInfo->Address < pArgs->uModAddr)
+    {
+        Log((" %#018RX64 %05u  %s  [SKIPPED - INVALID ADDRESS!]\n", pLineInfo->Address, pLineInfo->LineNumber));
+        return TRUE;
+    }
+
+    /*
+     * To save having to call RTUtf16ToUtf8 every time, we keep a copy of the
+     * previous file name both as UTF-8 and UTF-16.
+     */
+    /** @todo we could combine RTUtf16Len and memcmp... */
+    size_t cbLen  = (RTUtf16Len(pLineInfo->FileName) + 1) * sizeof(RTUTF16);
+    if (   !pArgs->pwszPrev
+        || memcmp(pArgs->pwszPrev, pLineInfo->FileName, cbLen) )
+    {
+        if (pArgs->cbPrevUtf16Alloc >= cbLen)
+            memcpy(pArgs->pwszPrev, pLineInfo->FileName, cbLen);
+        else
+        {
+            RTMemFree(pArgs->pwszPrev);
+            pArgs->cbPrevUtf16Alloc = cbLen;
+            pArgs->pwszPrev = (PRTUTF16)RTMemDupEx(pLineInfo->FileName, cbLen, pArgs->cbPrevUtf16Alloc - cbLen);
+            if (!pArgs->pwszPrev)
+                pArgs->cbPrevUtf16Alloc = 0;
+        }
+
+        RTStrFree(pArgs->pszPrev);
+        pArgs->pszPrev = NULL;
+        int rc = RTUtf16ToUtf8(pLineInfo->FileName, &pArgs->pszPrev);
+        if (RT_FAILURE(rc))
+        {
+            SetLastError(ERROR_OUTOFMEMORY);
+            Log(("rtDbgModDbgHelpCopyLineNumberCallback: Out of memory\n"));
+            return FALSE;
+        }
+    }
+
+    /*
+     * Add the line number to the container.
+     */
+    int rc = RTDbgModLineAdd(pArgs->hCnt, pArgs->pszPrev, pLineInfo->LineNumber,
+                             RTDBGSEGIDX_RVA, pLineInfo->Address - pArgs->uModAddr, NULL);
+    Log((" %#018RX64 %05u  %s  [%Rrc]\n", pLineInfo->Address, pLineInfo->LineNumber, pArgs->pszPrev, rc));
+    NOREF(rc);
+
+    return TRUE;
+}
+
+
+/**
+ * Copies the line numbers into the container.
+ *
+ * @returns IPRT status code.
+ * @param   pMod                The debug module.
+ * @param   hCnt                The container that will keep the symbols.
+ * @param   hFake               The fake process handle.
+ * @param   uModAddr            The module load address.
+ */
+static int rtDbgModDbgHelpCopyLineNumbers(PRTDBGMODINT pMod, RTDBGMOD hCnt, HANDLE hFake, uint64_t uModAddr)
+{
+    RTDBGMODBGHELPARGS Args;
+    Args.hCnt             = hCnt;
+    Args.pMod             = pMod;
+    Args.uModAddr         = uModAddr;
+    Args.pszPrev          = NULL;
+    Args.pwszPrev         = NULL;
+    Args.cbPrevUtf16Alloc = 0;
+
+    int rc;
+    if (SymEnumLinesW(hFake, uModAddr, NULL /*pszObj*/, NULL /*pszFile*/, rtDbgModDbgHelpCopyLineNumberCallback, &Args))
+        rc = VINF_SUCCESS;
+    else
+    {
+        rc = RTErrConvertFromWin32(GetLastError());
+        Log(("Line number enum: %Rrc (%u)\n", rc, GetLastError()));
+        if (rc == VERR_NOT_SUPPORTED)
+            rc = VINF_SUCCESS;
+    }
+
+    RTStrFree(Args.pszPrev);
+    RTMemFree(Args.pwszPrev);
+    return rc;
+}
+
+
+/**
+ * SymEnumSymbols callback that adds a symbol to the container.
+ *
+ * @returns TRUE
+ * @param   pSymInfo            The symbol information.
+ * @param   cbSymbol            The symbol size (estimated).
+ * @param   pvUser              Pointer to a RTDBGMODBGHELPARGS structure.
+ */
+static BOOL CALLBACK rtDbgModDbgHelpCopySymbolsCallback(PSYMBOL_INFO pSymInfo, ULONG cbSymbol, PVOID pvUser)
+{
+    RTDBGMODBGHELPARGS *pArgs = (RTDBGMODBGHELPARGS *)pvUser;
+    if (pSymInfo->Address < pArgs->uModAddr) /* NT4 SP1 ntfs.dbg */
+    {
+        Log(("  %#018RX64 LB %#07x  %s  [SKIPPED - INVALID ADDRESS!]\n", pSymInfo->Address, cbSymbol, pSymInfo->Name));
+        return TRUE;
+    }
+    if (pSymInfo->NameLen >= RTDBG_SYMBOL_NAME_LENGTH)
+    {
+        Log(("  %#018RX64 LB %#07x  %s  [SKIPPED - TOO LONG (%u > %u)!]\n", pSymInfo->Address, cbSymbol, pSymInfo->Name,
+             pSymInfo->NameLen, RTDBG_SYMBOL_NAME_LENGTH));
+        return TRUE;
+    }
+
+    /* ASSUMES the symbol name is ASCII. */
+    int rc = RTDbgModSymbolAdd(pArgs->hCnt, pSymInfo->Name, RTDBGSEGIDX_RVA,
+                               pSymInfo->Address - pArgs->uModAddr, cbSymbol, 0, NULL);
+    Log(("  %#018RX64 LB %#07x  %s  [%Rrc]\n", pSymInfo->Address, cbSymbol, pSymInfo->Name, rc));
+    NOREF(rc);
+
+    return TRUE;
+}
+
+
+/**
+ * Copies the symbols into the container.
+ *
+ * @returns IPRT status code.
+ * @param   pMod                The debug module.
+ * @param   hCnt                The container that will keep the symbols.
+ * @param   hFake               The fake process handle.
+ * @param   uModAddr            The module load address.
+ */
+static int rtDbgModDbgHelpCopySymbols(PRTDBGMODINT pMod, RTDBGMOD hCnt, HANDLE hFake, uint64_t uModAddr)
+{
+    RTDBGMODBGHELPARGS Args;
+    Args.hCnt     = hCnt;
+    Args.pMod     = pMod;
+    Args.uModAddr = uModAddr;
+    int rc;
+    if (SymEnumSymbols(hFake, uModAddr, NULL, rtDbgModDbgHelpCopySymbolsCallback, &Args))
+        rc = VINF_SUCCESS;
+    else
+    {
+        rc = RTErrConvertFromWin32(GetLastError());
+        Log(("SymEnumSymbols: %Rrc (%u)\n", rc, GetLastError()));
+    }
+    return rc;
+}
+
+
+/** @callback_method_impl{FNRTLDRENUMSEGS,
+ * Copies the PE segments over into the container.} */
+static DECLCALLBACK(int) rtDbgModDbgHelpAddSegmentsCallback(RTLDRMOD hLdrMod, PCRTLDRSEG pSeg, void *pvUser)
+{
+    RTDBGMODBGHELPARGS *pArgs = (RTDBGMODBGHELPARGS *)pvUser;
+    RT_NOREF_PV(hLdrMod);
+
+    Log(("Segment %.*s: LinkAddress=%#llx RVA=%#llx cb=%#llx\n",
+         pSeg->cchName, pSeg->pszName, (uint64_t)pSeg->LinkAddress, (uint64_t)pSeg->RVA, pSeg->cb));
+
+    Assert(pSeg->cchName > 0);
+    Assert(!pSeg->pszName[pSeg->cchName]);
+
+    RTLDRADDR cb   = RT_MAX(pSeg->cb, pSeg->cbMapped);
+    RTLDRADDR uRva = pSeg->RVA;
+    if (!uRva)
+        pArgs->uModAddr = pSeg->LinkAddress;
+    else if (uRva == NIL_RTLDRADDR)
+    {
+        cb   = 0;
+        uRva = pArgs->uNextRva;
+    }
+    pArgs->uNextRva = uRva + cb;
+
+    return RTDbgModSegmentAdd(pArgs->hCnt, uRva, cb, pSeg->pszName, 0 /*fFlags*/, NULL);
+}
+
+
+/** @interface_method_impl{RTDBGMODVTDBG,pfnTryOpen} */
+static DECLCALLBACK(int) rtDbgModDbgHelp_TryOpen(PRTDBGMODINT pMod, RTLDRARCH enmArch)
+{
+    NOREF(enmArch);
+
+    /*
+     * Currently only support external files with a executable already present.
+     */
+    if (!pMod->pszDbgFile)
+        return VERR_DBG_NO_MATCHING_INTERPRETER;
+    if (!pMod->pImgVt)
+        return VERR_DBG_NO_MATCHING_INTERPRETER;
+
+    /*
+     * Create a container for copying the information into.  We do this early
+     * so we can determine the image base address.
+     */
+    RTDBGMOD hCnt;
+    int rc = RTDbgModCreate(&hCnt, pMod->pszName, 0 /*cbSeg*/, 0 /*fFlags*/);
+    if (RT_SUCCESS(rc))
+    {
+        RTDBGMODBGHELPARGS Args;
+        RT_ZERO(Args);
+        Args.hCnt = hCnt;
+        rc = pMod->pImgVt->pfnEnumSegments(pMod, rtDbgModDbgHelpAddSegmentsCallback, &Args);
+        if (RT_SUCCESS(rc))
+        {
+            uint32_t cbImage    = pMod->pImgVt->pfnImageSize(pMod);
+            uint64_t uImageBase = Args.uModAddr ? Args.uModAddr : 0x4000000;
+
+            /*
+             * Try load the module into an empty address space.
+             */
+            static uint32_t volatile s_uFakeHandle = 0x3940000;
+            HANDLE hFake;
+            do
+                hFake = (HANDLE)(uintptr_t)ASMAtomicIncU32(&s_uFakeHandle);
+            while (hFake == NULL || hFake == INVALID_HANDLE_VALUE);
+
+            LogFlow(("rtDbgModDbgHelp_TryOpen: \n"));
+            if (SymInitialize(hFake, NULL /*SearchPath*/, FALSE /*fInvalidProcess*/))
+            {
+                SymSetOptions(SYMOPT_LOAD_LINES | SymGetOptions());
+
+                PRTUTF16 pwszDbgFile;
+                rc = RTStrToUtf16(pMod->pszDbgFile, &pwszDbgFile);
+                if (RT_SUCCESS(rc))
+                {
+                    uint64_t uModAddr = SymLoadModuleExW(hFake, NULL /*hFile*/, pwszDbgFile, NULL /*pszModName*/,
+                                                         uImageBase, cbImage, NULL /*pModData*/, 0 /*fFlags*/);
+                    if (uModAddr != 0)
+                    {
+                        rc = rtDbgModDbgHelpCopySymbols(pMod, hCnt, hFake, uModAddr);
+                        if (RT_SUCCESS(rc))
+                            rc = rtDbgModDbgHelpCopyLineNumbers(pMod, hCnt, hFake, uModAddr);
+                        if (RT_SUCCESS(rc))
+                        {
+                            pMod->pvDbgPriv = hCnt;
+                            pMod->pDbgVt    = &g_rtDbgModVtDbgDbgHelp;
+                            hCnt = NIL_RTDBGMOD;
+                            LogFlow(("rtDbgModDbgHelp_TryOpen: Successfully loaded '%s' at %#llx\n",
+                                     pMod->pszDbgFile, (uint64_t)uImageBase));
+                        }
+
+                        SymUnloadModule64(hFake, uModAddr);
+                    }
+                    else
+                    {
+                        rc = RTErrConvertFromWin32(GetLastError());
+                        if (RT_SUCCESS_NP(rc))
+                            rc = VERR_DBG_NO_MATCHING_INTERPRETER;
+                        LogFlow(("rtDbgModDbgHelp_TryOpen: Error loading the module '%s' at %#llx: %Rrc (%u)\n",
+                                 pMod->pszDbgFile, (uint64_t)uImageBase, rc, GetLastError()));
+                    }
+                    RTUtf16Free(pwszDbgFile);
+                }
+                else
+                    LogFlow(("rtDbgModDbgHelp_TryOpen: Unicode version issue: %Rrc\n", rc));
+
+                BOOL fRc2 = SymCleanup(hFake); Assert(fRc2); NOREF(fRc2);
+            }
+            else
+            {
+                rc = RTErrConvertFromWin32(GetLastError());
+                if (RT_SUCCESS_NP(rc))
+                    rc = VERR_DBG_NO_MATCHING_INTERPRETER;
+                LogFlow(("rtDbgModDbgHelp_TryOpen: SymInitialize failed: %Rrc (%u)\n", rc, GetLastError()));
+            }
+        }
+        RTDbgModRelease(hCnt);
+    }
+    return rc;
+}
+
+
+
+/** Virtual function table for the DBGHELP debug info reader. */
+DECL_HIDDEN_CONST(RTDBGMODVTDBG) const g_rtDbgModVtDbgDbgHelp =
+{
+    /*.u32Magic = */            RTDBGMODVTDBG_MAGIC,
+    /*.fSupports = */           RT_DBGTYPE_CODEVIEW,
+    /*.pszName = */             "dbghelp",
+    /*.pfnTryOpen = */          rtDbgModDbgHelp_TryOpen,
+    /*.pfnClose = */            rtDbgModDbgHelp_Close,
+
+    /*.pfnRvaToSegOff = */      rtDbgModDbgHelp_RvaToSegOff,
+    /*.pfnImageSize = */        rtDbgModDbgHelp_ImageSize,
+
+    /*.pfnSegmentAdd = */       rtDbgModDbgHelp_SegmentAdd,
+    /*.pfnSegmentCount = */     rtDbgModDbgHelp_SegmentCount,
+    /*.pfnSegmentByIndex = */   rtDbgModDbgHelp_SegmentByIndex,
+
+    /*.pfnSymbolAdd = */        rtDbgModDbgHelp_SymbolAdd,
+    /*.pfnSymbolCount = */      rtDbgModDbgHelp_SymbolCount,
+    /*.pfnSymbolByOrdinal = */  rtDbgModDbgHelp_SymbolByOrdinal,
+    /*.pfnSymbolByName = */     rtDbgModDbgHelp_SymbolByName,
+    /*.pfnSymbolByAddr = */     rtDbgModDbgHelp_SymbolByAddr,
+
+    /*.pfnLineAdd = */          rtDbgModDbgHelp_LineAdd,
+    /*.pfnLineCount = */        rtDbgModDbgHelp_LineCount,
+    /*.pfnLineByOrdinal = */    rtDbgModDbgHelp_LineByOrdinal,
+    /*.pfnLineByAddr = */       rtDbgModDbgHelp_LineByAddr,
+
+    /*.pfnUnwindFrame = */      rtDbgModDbgHelp_UnwindFrame,
+
+    /*.u32EndMagic = */         RTDBGMODVTDBG_MAGIC
+};
+