Adding upstream version 1:7.0.4.upstream/1%7.0.4upstream

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

1 files changed, 794 insertions, 0 deletions

diff --git a/basic/source/runtime/dllmgr-x64.cxx b/basic/source/runtime/dllmgr-x64.cxx
new file mode 100644
index 000000000..0cc276192
--- /dev/null
+++ b/basic/source/runtime/dllmgr-x64.cxx
@@ -0,0 +1,794 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#if defined(_WIN32)
+#include <prewin.h>
+#include <postwin.h>
+#endif
+
+#include <algorithm>
+#include <cstddef>
+#include <map>
+#include <vector>
+
+#include <basic/sbx.hxx>
+#include <basic/sbxvar.hxx>
+#include <runtime.hxx>
+#include <osl/thread.h>
+#include <osl/diagnose.h>
+#include <rtl/ref.hxx>
+#include <rtl/string.hxx>
+#include <rtl/ustring.hxx>
+#include <sal/log.hxx>
+#include <salhelper/simplereferenceobject.hxx>
+#include <o3tl/char16_t2wchar_t.hxx>
+
+#undef max
+
+#include "dllmgr.hxx"
+
+using namespace css;
+
+/* Open issues:
+
+   Missing support for functions returning structs (see TODO in call()).
+
+   Missing support for additional data types (64 bit integers, Any, ...; would
+   trigger assert(false) in various switches).
+
+   It is assumed that the variables passed into SbiDllMgr::Call to represent
+   the arguments and return value have types that exactly match the Declare
+   statement; it would be better if this code had access to the function
+   signature from the Declare statement, so that it could convert the passed
+   variables accordingly.
+*/
+
+namespace {
+
+char * address(std::vector< char > & blob) {
+    return blob.empty() ? nullptr : blob.data();
+}
+
+ErrCode convert(OUString const & source, OString * target) {
+    return
+        source.convertToString(
+            target, osl_getThreadTextEncoding(),
+            (RTL_UNICODETOTEXT_FLAGS_UNDEFINED_ERROR |
+             RTL_UNICODETOTEXT_FLAGS_INVALID_ERROR))
+        ? ERRCODE_NONE : ERRCODE_BASIC_BAD_ARGUMENT;
+        //TODO: more specific errcode?
+}
+
+ErrCode convert(char const * source, sal_Int32 length, OUString * target) {
+    return
+        rtl_convertStringToUString(
+            &target->pData, source, length, osl_getThreadTextEncoding(),
+            (RTL_TEXTTOUNICODE_FLAGS_UNDEFINED_ERROR |
+             RTL_TEXTTOUNICODE_FLAGS_MBUNDEFINED_ERROR |
+             RTL_TEXTTOUNICODE_FLAGS_INVALID_ERROR))
+        ? ERRCODE_NONE : ERRCODE_BASIC_BAD_ARGUMENT;
+        //TODO: more specific errcode?
+}
+
+struct UnmarshalData {
+    UnmarshalData(SbxVariable * theVariable, void * theBuffer):
+        variable(theVariable), buffer(theBuffer) {}
+
+    SbxVariable * variable;
+    void * buffer;
+};
+
+struct StringData: public UnmarshalData {
+    StringData(SbxVariable * theVariable, void * theBuffer, bool theSpecial):
+        UnmarshalData(theVariable, theBuffer), special(theSpecial) {}
+
+    bool special;
+};
+
+class MarshalData {
+public:
+    MarshalData() = default;
+    MarshalData(const MarshalData&) = delete;
+    const MarshalData& operator=(const MarshalData&) = delete;
+
+    std::vector< char > * newBlob() {
+        blobs_.push_back(std::vector< char >());
+        return &blobs_.back();
+    }
+
+    std::vector< UnmarshalData > unmarshal;
+
+    std::vector< StringData > unmarshalStrings;
+
+private:
+    std::vector< std::vector< char > > blobs_;
+};
+
+std::size_t align(std::size_t address, std::size_t alignment) {
+    // alignment = 2^k for some k >= 0
+    return (address + (alignment - 1)) & ~(alignment - 1);
+}
+
+char * align(
+    std::vector< char > & blob, std::size_t alignment, std::size_t offset,
+    std::size_t add)
+{
+    std::vector< char >::size_type n = blob.size();
+    n = align(n - offset, alignment) + offset; //TODO: overflow in align()
+    blob.resize(n + add); //TODO: overflow
+    return address(blob) + n;
+}
+
+template< typename T > void add(
+    std::vector< char > & blob, T const & data, std::size_t alignment,
+    std::size_t offset)
+{
+    *reinterpret_cast< T * >(align(blob, alignment, offset, sizeof (T))) = data;
+}
+
+std::size_t alignment(SbxVariable const * variable) {
+    assert(variable != nullptr);
+    if ((variable->GetType() & SbxARRAY) == 0) {
+        switch (variable->GetType()) {
+        case SbxINTEGER:
+            return 2;
+        case SbxLONG:
+        case SbxSINGLE:
+        case SbxSTRING:
+            return 4;
+        case SbxDOUBLE:
+            return 8;
+        case SbxOBJECT:
+            {
+                std::size_t n = 1;
+                SbxObject* pobj = dynamic_cast<SbxObject*>(variable->GetObject());
+                assert(pobj);
+                SbxArray* props = pobj->GetProperties();
+                for (sal_uInt32 i = 0; i < props->Count32(); ++i) {
+                    n = std::max(n, alignment(props->Get32(i)));
+                }
+                return n;
+            }
+        case SbxBOOL:
+        case SbxBYTE:
+            return 1;
+        default:
+            assert(false);
+            return 1;
+        }
+    } else {
+        SbxDimArray * arr = dynamic_cast<SbxDimArray*>( variable->GetObject() );
+        assert(arr);
+        sal_Int32 dims = arr->GetDims32();
+        std::vector< sal_Int32 > low(dims);
+        for (sal_Int32 i = 0; i < dims; ++i) {
+            sal_Int32 up;
+            arr->GetDim32(i + 1, low[i], up);
+        }
+        return alignment(arr->Get32(low.data()));
+    }
+}
+
+ErrCode marshal(
+    bool outer, SbxVariable * variable, bool special,
+    std::vector< char > & blob, std::size_t offset, MarshalData & data);
+
+ErrCode marshalString(
+    SbxVariable * variable, bool special, MarshalData & data, void ** buffer)
+{
+    assert(variable != nullptr && buffer != nullptr);
+    OString str;
+    ErrCode e = convert(variable->GetOUString(), &str);
+    if (e != ERRCODE_NONE) {
+        return e;
+    }
+    std::vector< char > * blob = data.newBlob();
+    blob->insert(blob->begin(), str.getStr(), str.getStr() + str.getLength() + 1);
+    *buffer = address(*blob);
+    data.unmarshalStrings.push_back(StringData(variable, *buffer, special));
+    return ERRCODE_NONE;
+}
+
+ErrCode marshalStruct(
+    SbxVariable const * variable, std::vector< char > & blob, std::size_t offset,
+    MarshalData & data)
+{
+    assert(variable != nullptr);
+    SbxObject* pobj = dynamic_cast<SbxObject*>(variable->GetObject());
+    assert(pobj);
+    SbxArray* props = pobj->GetProperties();
+    for (sal_uInt32 i = 0; i < props->Count32(); ++i) {
+        ErrCode e = marshal(false, props->Get32(i), false, blob, offset, data);
+        if (e != ERRCODE_NONE) {
+            return e;
+        }
+    }
+    return ERRCODE_NONE;
+}
+
+ErrCode marshalArray(
+    SbxVariable const * variable, std::vector< char > & blob, std::size_t offset,
+    MarshalData & data)
+{
+    assert(variable != nullptr);
+    SbxDimArray * arr = dynamic_cast<SbxDimArray*>( variable->GetObject() );
+    assert(arr);
+    sal_Int32 dims = arr->GetDims32();
+    std::vector< sal_Int32 > low(dims);
+    std::vector< sal_Int32 > up(dims);
+    for (sal_Int32 i = 0; i < dims; ++i) {
+        arr->GetDim32(i + 1, low[i], up[i]);
+    }
+    for (std::vector< sal_Int32 > idx = low;;) {
+        ErrCode e = marshal(
+            false, arr->Get32(idx.data()), false, blob, offset, data);
+        if (e != ERRCODE_NONE) {
+            return e;
+        }
+        sal_Int32 i = dims - 1;
+        while (idx[i] == up[i]) {
+            idx[i] = low[i];
+            if (i == 0) {
+                return ERRCODE_NONE;
+            }
+            --i;
+        }
+        ++idx[i];
+    }
+}
+
+// 8-aligned structs are only 4-aligned on stack, so alignment of members in
+// such structs must take that into account via "offset"
+ErrCode marshal(
+    bool outer, SbxVariable * variable, bool special,
+    std::vector< char > & blob, std::size_t offset, MarshalData & data)
+{
+    assert(variable != nullptr);
+
+    SbxDataType eVarType = variable->GetType();
+    bool bByVal = !(variable->GetFlags() & SbxFlagBits::Reference);
+    if( !bByVal && !SbiRuntime::isVBAEnabled() && eVarType == SbxSTRING )
+        bByVal = true;
+
+    if (bByVal) {
+        if ((eVarType & SbxARRAY) == 0) {
+            switch (eVarType) {
+            case SbxINTEGER:
+                add(blob, variable->GetInteger(), outer ? 8 : 2, offset);
+                break;
+            case SbxLONG:
+                add(blob, variable->GetLong(), outer ? 8 : 4, offset);
+                break;
+            case SbxSINGLE:
+                add(blob, variable->GetSingle(), outer ? 8 : 4, offset);
+                break;
+            case SbxDOUBLE:
+                add(blob, variable->GetDouble(), 8, offset);
+                break;
+            case SbxSTRING:
+                {
+                    void * p;
+                    ErrCode e = marshalString(variable, special, data, &p);
+                    if (e != ERRCODE_NONE) {
+                        return e;
+                    }
+                    add(blob, p, 8, offset);
+                    break;
+                }
+            case SbxOBJECT:
+                {
+                    align(blob, outer ? 8 : alignment(variable), offset, 0);
+                    ErrCode e = marshalStruct(variable, blob, offset, data);
+                    if (e != ERRCODE_NONE) {
+                        return e;
+                    }
+                    break;
+                }
+            case SbxBOOL:
+                add(blob, variable->GetBool(), outer ? 8 : 1, offset);
+                break;
+            case SbxBYTE:
+                add(blob, variable->GetByte(), outer ? 8 : 1, offset);
+                break;
+            default:
+                assert(false);
+                break;
+            }
+        } else {
+            ErrCode e = marshalArray(variable, blob, offset, data);
+            if (e != ERRCODE_NONE) {
+                return e;
+            }
+        }
+    } else {
+        if ((eVarType & SbxARRAY) == 0) {
+            switch (eVarType) {
+            case SbxINTEGER:
+            case SbxLONG:
+            case SbxSINGLE:
+            case SbxDOUBLE:
+            case SbxBOOL:
+            case SbxBYTE:
+                add(blob, variable->data(), 8, offset);
+                break;
+            case SbxSTRING:
+                {
+                    void * p;
+                    ErrCode e = marshalString(variable, special, data, &p);
+                    if (e != ERRCODE_NONE) {
+                        return e;
+                    }
+                    std::vector< char >* blob2 = data.newBlob();
+                    add(*blob2, p, 8, 0);
+                    add(blob, address(*blob2), 8, offset);
+                    break;
+                }
+            case SbxOBJECT:
+                {
+                    std::vector< char > * blob2 = data.newBlob();
+                    ErrCode e = marshalStruct(variable, *blob2, 0, data);
+                    if (e != ERRCODE_NONE) {
+                        return e;
+                    }
+                    void * p = address(*blob2);
+                    if (outer) {
+                        data.unmarshal.push_back(UnmarshalData(variable, p));
+                    }
+                    add(blob, p, 8, offset);
+                    break;
+                }
+            default:
+                assert(false);
+                break;
+            }
+        } else {
+            std::vector< char > * blob2 = data.newBlob();
+            ErrCode e = marshalArray(variable, *blob2, 0, data);
+            if (e != ERRCODE_NONE) {
+                return e;
+            }
+            void * p = address(*blob2);
+            if (outer) {
+                data.unmarshal.push_back(UnmarshalData(variable, p));
+            }
+            add(blob, p, 8, offset);
+        }
+    }
+    return ERRCODE_NONE;
+}
+
+template< typename T > T read(void const ** pointer) {
+    T const * p = static_cast< T const * >(*pointer);
+    *pointer = static_cast< void const * >(p + 1);
+    return *p;
+}
+
+void const * unmarshal(SbxVariable * variable, void const * data) {
+    assert(variable != nullptr);
+    if ((variable->GetType() & SbxARRAY) == 0) {
+        switch (variable->GetType()) {
+        case SbxINTEGER:
+            variable->PutInteger(read< sal_Int16 >(&data));
+            break;
+        case SbxLONG:
+            variable->PutLong(read< sal_Int32 >(&data));
+            break;
+        case SbxSINGLE:
+            variable->PutSingle(read< float >(&data));
+            break;
+        case SbxDOUBLE:
+            variable->PutDouble(read< double >(&data));
+            break;
+        case SbxSTRING:
+            read< char * >(&data); // handled by unmarshalString
+            break;
+        case SbxOBJECT:
+            {
+                data = reinterpret_cast< void const * >(
+                    align(
+                        reinterpret_cast< sal_uIntPtr >(data),
+                        alignment(variable)));
+                SbxObject* pobj = dynamic_cast<SbxObject*>(variable->GetObject());
+                assert(pobj);
+                SbxArray* props = pobj->GetProperties();
+                for (sal_uInt32 i = 0; i < props->Count32(); ++i) {
+                    data = unmarshal(props->Get32(i), data);
+                }
+                break;
+            }
+        case SbxBOOL:
+            variable->PutBool(read< sal_Bool >(&data));
+            break;
+        case SbxBYTE:
+            variable->PutByte(read< sal_uInt8 >(&data));
+            break;
+        default:
+            assert(false);
+            break;
+        }
+    } else {
+        SbxDimArray * arr = dynamic_cast<SbxDimArray*>( variable->GetObject() );
+        assert(arr);
+        sal_Int32 dims = arr->GetDims32();
+        std::vector< sal_Int32 > low(dims);
+        std::vector< sal_Int32 > up(dims);
+        for (sal_Int32 i = 0; i < dims; ++i) {
+            arr->GetDim32(i + 1, low[i], up[i]);
+        }
+        for (std::vector< sal_Int32 > idx = low;;) {
+            data = unmarshal(arr->Get32(idx.data()), data);
+            sal_Int32 i = dims - 1;
+            while (idx[i] == up[i]) {
+                idx[i] = low[i];
+                if (i == 0) {
+                    goto done;
+                }
+                --i;
+            }
+            ++idx[i];
+        }
+    done:;
+    }
+    return data;
+}
+
+ErrCode unmarshalString(StringData const & data, SbxVariable const & result) {
+    OUString str;
+    if (data.buffer != nullptr) {
+        char const * p = static_cast< char const * >(data.buffer);
+        sal_Int32 len;
+        if (data.special) {
+            len = static_cast< sal_Int32 >(result.GetULong());
+            if (len < 0) { // i.e., DWORD result >= 2^31
+                return ERRCODE_BASIC_BAD_ARGUMENT;
+                    //TODO: more specific errcode?
+            }
+        } else {
+            len = rtl_str_getLength(p);
+        }
+        ErrCode e = convert(p, len, &str);
+        if (e != ERRCODE_NONE) {
+            return e;
+        }
+    }
+    data.variable->PutString(str);
+    return ERRCODE_NONE;
+}
+
+struct ProcData {
+    OString name;
+    FARPROC proc;
+};
+
+ErrCode call(
+    OUString const & dll, ProcData const & proc, SbxArray * arguments,
+    SbxVariable & result)
+{
+    if (arguments && arguments->Count32() > 20)
+        return ERRCODE_BASIC_NOT_IMPLEMENTED;
+
+    std::vector< char > stack;
+    MarshalData data;
+
+    // For DWORD GetLogicalDriveStringsA(DWORD nBufferLength, LPSTR lpBuffer)
+    // from kernel32, upon return, filled lpBuffer length is result DWORD, which
+    // requires special handling in unmarshalString; other functions might
+    // require similar treatment, too:
+    bool special =
+        dll.equalsIgnoreAsciiCase("KERNEL32.DLL") &&
+        (proc.name == OString("GetLogicalDriveStringsA"));
+    for (sal_uInt32 i = 1; i < (arguments == nullptr ? 0 : arguments->Count32()); ++i) {
+        ErrCode e = marshal(
+            true, arguments->Get32(i), special && i == 2, stack, stack.size(),
+            data);
+        if (e != ERRCODE_NONE) {
+            return e;
+        }
+        align(stack, 8, 0, 0);
+    }
+
+    stack.resize(20*8);
+
+    // We fake all calls as being to a varargs function,
+    // as this means any floating-point argument among the first four
+    // ones will end up in a XMM register where the callee expects it.
+    sal_Int32 (*proc_i)(double d, ...) = reinterpret_cast<sal_Int32 (*)(double, ...)>(proc.proc);
+    double (*proc_d)(double d, ...) = reinterpret_cast<double (*)(double, ...)>(proc.proc);
+
+    sal_Int64 iRetVal = 0;
+    double dRetVal = 0.0;
+
+    switch (result.GetType()) {
+    case SbxEMPTY:
+    case SbxINTEGER:
+    case SbxLONG:
+    case SbxSTRING:
+    case SbxOBJECT:
+    case SbxBOOL:
+    case SbxBYTE:
+        {
+            auto const st = stack.data();
+            iRetVal =
+                proc_i(*reinterpret_cast<double *>(st + 0),
+                       *reinterpret_cast<double *>(st + 1*8),
+                       *reinterpret_cast<double *>(st + 2*8),
+                       *reinterpret_cast<double *>(st + 3*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 4*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 5*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 6*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 7*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 8*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 9*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 10*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 11*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 12*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 13*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 14*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 15*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 16*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 17*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 18*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 19*8));
+            break;
+        }
+    case SbxSINGLE:
+    case SbxDOUBLE:
+        {
+            auto const st = stack.data();
+            dRetVal =
+                proc_d(*reinterpret_cast<double *>(st + 0),
+                       *reinterpret_cast<double *>(st + 1*8),
+                       *reinterpret_cast<double *>(st + 2*8),
+                       *reinterpret_cast<double *>(st + 3*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 4*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 5*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 6*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 7*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 8*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 9*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 10*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 11*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 12*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 13*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 14*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 15*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 16*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 17*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 18*8),
+                       *reinterpret_cast<sal_uInt64 *>(st + 19*8));
+            break;
+        }
+    default:
+        break;
+    }
+
+    switch (result.GetType()) {
+    case SbxEMPTY:
+        break;
+    case SbxINTEGER:
+        result.PutInteger(static_cast< sal_Int16 >(iRetVal));
+        break;
+    case SbxLONG:
+        result.PutLong(static_cast< sal_Int32 >(iRetVal));
+        break;
+    case SbxSINGLE:
+        result.PutSingle(static_cast< float >(dRetVal));
+        break;
+    case SbxDOUBLE:
+        result.PutDouble(dRetVal);
+        break;
+    case SbxSTRING:
+        {
+            char const * s1 = reinterpret_cast< char const * >(iRetVal);
+            OUString s2;
+            ErrCode e = convert(s1, rtl_str_getLength(s1), &s2);
+            if (e != ERRCODE_NONE) {
+                return e;
+            }
+            result.PutString(s2);
+            break;
+        }
+    case SbxOBJECT:
+        //TODO
+        break;
+    case SbxBOOL:
+        result.PutBool(bool(iRetVal));
+        break;
+    case SbxBYTE:
+        result.PutByte(static_cast< sal_uInt8 >(iRetVal));
+        break;
+    default:
+        assert(false);
+        break;
+    }
+    for (sal_uInt32 i = 1; i < (arguments == nullptr ? 0 : arguments->Count32()); ++i) {
+        arguments->Get32(i)->ResetFlag(SbxFlagBits::Reference);
+            //TODO: skipped for errors?!?
+    }
+    for (auto const& elem : data.unmarshal)
+    {
+        unmarshal(elem.variable, elem.buffer);
+    }
+    for (auto const& elem : data.unmarshalStrings)
+    {
+        ErrCode e = unmarshalString(elem, result);
+        if (e != ERRCODE_NONE) {
+            return e;
+        }
+    }
+    return ERRCODE_NONE;
+}
+
+ErrCode getProcData(HMODULE handle, OUString const & name, ProcData * proc)
+{
+    assert(proc != nullptr);
+    if (name.getLength() != 0 && name[0] == '@') { //TODO: "@" vs. "#"???
+        sal_Int32 n = name.copy(1).toInt32(); //TODO: handle bad input
+        if (n <= 0 || n > 0xFFFF) {
+            return ERRCODE_BASIC_BAD_ARGUMENT; //TODO: more specific errcode?
+        }
+        FARPROC p = GetProcAddress(handle, reinterpret_cast< LPCSTR >(n));
+        if (p != nullptr) {
+            proc->name = "#" + OString::number(n);
+            proc->proc = p;
+            return ERRCODE_NONE;
+        }
+    } else {
+        OString name8;
+        ErrCode e = convert(name, &name8);
+        if (e != ERRCODE_NONE) {
+            return e;
+        }
+        FARPROC p = GetProcAddress(handle, name8.getStr());
+        if (p != nullptr) {
+            proc->name = name8;
+            proc->proc = p;
+            return ERRCODE_NONE;
+        }
+        sal_Int32 i = name8.indexOf('#');
+        if (i != -1) {
+            name8 = name8.copy(0, i);
+            p = GetProcAddress(handle, name8.getStr());
+            if (p != nullptr) {
+                proc->name = name8;
+                proc->proc = p;
+                return ERRCODE_NONE;
+            }
+        }
+        OString real("_" + name8);
+        p = GetProcAddress(handle, real.getStr());
+        if (p != nullptr) {
+            proc->name = real;
+            proc->proc = p;
+            return ERRCODE_NONE;
+        }
+        real = name8 + "A";
+        p = GetProcAddress(handle, real.getStr());
+        if (p != nullptr) {
+            proc->name = real;
+            proc->proc = p;
+            return ERRCODE_NONE;
+        }
+    }
+    return ERRCODE_BASIC_PROC_UNDEFINED;
+}
+
+struct Dll: public salhelper::SimpleReferenceObject {
+private:
+    typedef std::map< OUString, ProcData > Procs;
+
+    virtual ~Dll() override;
+
+public:
+    Dll(): handle(nullptr) {}
+
+    ErrCode getProc(OUString const & name, ProcData * proc);
+
+    HMODULE handle;
+    Procs procs;
+};
+
+Dll::~Dll() {
+    if (handle != nullptr && !FreeLibrary(handle)) {
+        SAL_WARN("basic", "FreeLibrary(" << handle << ") failed with " << GetLastError());
+    }
+}
+
+ErrCode Dll::getProc(OUString const & name, ProcData * proc) {
+    Procs::iterator i(procs.find(name));
+    if (i != procs.end()) {
+        *proc = i->second;
+        return ERRCODE_NONE;
+    }
+    ErrCode e = getProcData(handle, name, proc);
+    if (e == ERRCODE_NONE) {
+        procs.emplace(name, *proc);
+    }
+    return e;
+}
+
+OUString fullDllName(OUString const & name) {
+    OUString full(name);
+    if (full.indexOf('.') == -1) {
+        full += ".DLL";
+    }
+    return full;
+}
+
+}
+
+struct SbiDllMgr::Impl{
+private:
+    typedef std::map< OUString, ::rtl::Reference< Dll > > Dlls;
+
+public:
+    Impl() = default;
+    Impl(const Impl&) = delete;
+    const Impl& operator=(const Impl&) = delete;
+    
+    Dll * getDll(OUString const & name);
+
+    Dlls dlls;
+};
+
+Dll * SbiDllMgr::Impl::getDll(OUString const & name) {
+    Dlls::iterator i(dlls.find(name));
+    if (i == dlls.end()) {
+        i = dlls.emplace(name, new Dll).first;
+        HMODULE h = LoadLibraryW(o3tl::toW(name.getStr()));
+        if (h == nullptr) {
+            dlls.erase(i);
+            return nullptr;
+        }
+        i->second->handle = h;
+    }
+    return i->second.get();
+}
+
+ErrCode SbiDllMgr::Call(
+    OUString const & function, OUString const & library,
+    SbxArray * arguments, SbxVariable & result, bool cdeclConvention)
+{
+    if (cdeclConvention) {
+        return ERRCODE_BASIC_NOT_IMPLEMENTED;
+    }
+    OUString dllName(fullDllName(library));
+    Dll * dll = impl_->getDll(dllName);
+    if (dll == nullptr) {
+        return ERRCODE_BASIC_BAD_DLL_LOAD;
+    }
+    ProcData proc;
+    ErrCode e = dll->getProc(function, &proc);
+    if (e != ERRCODE_NONE) {
+        return e;
+    }
+    return call(dllName, proc, arguments, result);
+}
+
+void SbiDllMgr::FreeDll(OUString const & library) {
+    impl_->dlls.erase(library);
+}
+
+SbiDllMgr::SbiDllMgr(): impl_(new Impl) {}
+
+SbiDllMgr::~SbiDllMgr() {}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */