xref: /AOO42X/main/bridges/source/cpp_uno/s5abi_macosx_aarch64/cpp2uno.cxx (revision cd15cd7435a5992ecd53f36ec66392bf63f53df1)

/**************************************************************
 *
 * 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
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 *************************************************************/



// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_bridges.hxx"

#include <stdio.h>
#include <stdlib.h>
#include <hash_map>

#include <rtl/alloc.h>
#include <osl/mutex.hxx>

#include <com/sun/star/uno/genfunc.hxx>
#include "com/sun/star/uno/RuntimeException.hpp"
#include <uno/data.h>
#include <typelib/typedescription.hxx>

#include "bridges/cpp_uno/shared/bridge.hxx"
#include "bridges/cpp_uno/shared/cppinterfaceproxy.hxx"
#include "bridges/cpp_uno/shared/types.hxx"
#include "bridges/cpp_uno/shared/vtablefactory.hxx"

#include "abi.hxx"
#include "share.hxx"

using namespace ::osl;
using namespace ::rtl;
using namespace ::com::sun::star::uno;

//==================================================================================================

// Perform the UNO call
//
// We must convert the parameters stored in gpreg, fpreg and ovrflw to UNO
// arguments and call pThis->getUnoI()->pDispatcher.
//
// gpreg:  this, [gpr params x0..x7]   (the indirect-result ptr is x8, separate)
// fpreg:  [fpr params d0..d7]
// ovrflw: [gpr or fpr params (properly aligned)]
//
// On AArch64 a structure bigger than 16 bytes is returned via the buffer
// addressed by x8 (pIndirectReturn); 'this' is always x0 = gpreg[0].
// Simple types are returned in x0,x1 (int) or d0,d1 (fp); HFAs in d0..d3;
// non-HFA structures <= 16 bytes in x0,x1.
static typelib_TypeClass cpp2uno_call(
    bridges::cpp_uno::shared::CppInterfaceProxy * pThis,
    const typelib_TypeDescription * pMemberTypeDescr,
    typelib_TypeDescriptionReference * pReturnTypeRef, // 0 indicates void return
    sal_Int32 nParams, typelib_MethodParameter * pParams,
    void ** gpreg, void ** fpreg, void ** ovrflw,
    void * pIndirectReturn, // AArch64 x8 indirect-result pointer (0 if none)
    sal_uInt64 * pRegisterReturn /* space for register return */ )
{
    unsigned int nr_gpr = 0; //number of gpr registers used
    unsigned int nr_fpr = 0; //number of fpr registers used

    // return
    typelib_TypeDescription * pReturnTypeDescr = 0;
    if (pReturnTypeRef)
        TYPELIB_DANGER_GET( &pReturnTypeDescr, pReturnTypeRef );

    void * pUnoReturn = 0;
    void * pCppReturn = 0; // complex return ptr: if != 0 && != pUnoReturn, reconversion need

    if ( pReturnTypeDescr )
    {
        if ( aarch64::return_in_hidden_param( pReturnTypeRef ) )
        {
            // AArch64: the indirect-result pointer arrives in x8, NOT in the
            // first general-purpose argument register (unlike x86-64 SysV).
            // So we take it from pIndirectReturn and do NOT consume a gpreg
            // slot here; 'this' still occupies gpreg[0] below.
            pCppReturn = pIndirectReturn;

            pUnoReturn = ( bridges::cpp_uno::shared::relatesToInterfaceType( pReturnTypeDescr )
                           ? alloca( pReturnTypeDescr->nSize )
                           : pCppReturn ); // direct way
        }
        else
            pUnoReturn = pRegisterReturn; // direct way for simple types
    }

    // pop this (x0)
    gpreg++;
    nr_gpr++;

    // stack space
    // parameters
    void ** pUnoArgs = reinterpret_cast<void **>(alloca( 4 * sizeof(void *) * nParams ));
    void ** pCppArgs = pUnoArgs + nParams;
    // indizes of values this have to be converted (interface conversion cpp<=>uno)
    sal_Int32 * pTempIndizes = reinterpret_cast<sal_Int32 *>(pUnoArgs + (2 * nParams));
    // type descriptions for reconversions
    typelib_TypeDescription ** ppTempParamTypeDescr = reinterpret_cast<typelib_TypeDescription **>(pUnoArgs + (3 * nParams));

    sal_Int32 nTempIndizes = 0;

    for ( sal_Int32 nPos = 0; nPos < nParams; ++nPos )
    {
        const typelib_MethodParameter & rParam = pParams[nPos];

        int nUsedGPR = 0;
        int nUsedFPR = 0;
        bool bFitsRegisters = aarch64::examine_argument( rParam.pTypeRef, false, nUsedGPR, nUsedFPR );
        if ( !rParam.bOut && bridges::cpp_uno::shared::isSimpleType( rParam.pTypeRef ) ) // value
        {
            // A simple UNO type occupies exactly one register, GPR or FPR.
            OSL_ASSERT( bFitsRegisters && ( ( nUsedFPR == 1 && nUsedGPR == 0 ) || ( nUsedFPR == 0 && nUsedGPR == 1 ) ) );

            if ( nUsedFPR == 1 )
            {
                if ( nr_fpr < aarch64::MAX_FPR_REGS )
                {
                    pCppArgs[nPos] = pUnoArgs[nPos] = fpreg++;
                    nr_fpr++;
                }
                else
                    pCppArgs[nPos] = pUnoArgs[nPos] = ovrflw++;
            }
            else if ( nUsedGPR == 1 )
            {
                if ( nr_gpr < aarch64::MAX_GPR_REGS )
                {
                    pCppArgs[nPos] = pUnoArgs[nPos] = gpreg++;
                    nr_gpr++;
                }
                else
                    pCppArgs[nPos] = pUnoArgs[nPos] = ovrflw++;
            }
        }
        else // struct <= 16 bytes || ptr to complex value || ref
        {
            typelib_TypeDescription * pParamTypeDescr = 0;
            TYPELIB_DANGER_GET( &pParamTypeDescr, rParam.pTypeRef );

            void *pCppStack;
            if ( nr_gpr < aarch64::MAX_GPR_REGS )
            {
                pCppArgs[nPos] = pCppStack = *gpreg++;
                nr_gpr++;
            }
            else
                pCppArgs[nPos] = pCppStack = *ovrflw++;

            if (! rParam.bIn) // is pure out
            {
                // uno out is unconstructed mem!
                pUnoArgs[nPos] = alloca( pParamTypeDescr->nSize );
                pTempIndizes[nTempIndizes] = nPos;
                // will be released at reconversion
                ppTempParamTypeDescr[nTempIndizes++] = pParamTypeDescr;
            }
            else if ( bridges::cpp_uno::shared::relatesToInterfaceType( pParamTypeDescr ) ) // is in/inout
            {
                uno_copyAndConvertData( pUnoArgs[nPos] = alloca( pParamTypeDescr->nSize ),
                                        pCppStack, pParamTypeDescr,
                                        pThis->getBridge()->getCpp2Uno() );
                pTempIndizes[nTempIndizes] = nPos; // has to be reconverted
                // will be released at reconversion
                ppTempParamTypeDescr[nTempIndizes++] = pParamTypeDescr;
            }
            else // direct way
            {
                pUnoArgs[nPos] = pCppStack;
                // no longer needed
                TYPELIB_DANGER_RELEASE( pParamTypeDescr );
            }
        }
    }

    // ExceptionHolder
    uno_Any aUnoExc; // Any will be constructed by callee
    uno_Any * pUnoExc = &aUnoExc;

    // invoke uno dispatch call
    (*pThis->getUnoI()->pDispatcher)( pThis->getUnoI(), pMemberTypeDescr, pUnoReturn, pUnoArgs, &pUnoExc );

    // in case an exception occurred...
    if ( pUnoExc )
    {
        // destruct temporary in/inout params
        for ( ; nTempIndizes--; )
        {
            sal_Int32 nIndex = pTempIndizes[nTempIndizes];

            if (pParams[nIndex].bIn) // is in/inout => was constructed
                uno_destructData( pUnoArgs[nIndex], ppTempParamTypeDescr[nTempIndizes], 0 );
            TYPELIB_DANGER_RELEASE( ppTempParamTypeDescr[nTempIndizes] );
        }
        if (pReturnTypeDescr)
            TYPELIB_DANGER_RELEASE( pReturnTypeDescr );

        CPPU_CURRENT_NAMESPACE::raiseException( &aUnoExc, pThis->getBridge()->getUno2Cpp() ); // has to destruct the any
        // is here for dummy
        return typelib_TypeClass_VOID;
    }
    else // else no exception occurred...
    {
        // temporary params
        for ( ; nTempIndizes--; )
        {
            sal_Int32 nIndex = pTempIndizes[nTempIndizes];
            typelib_TypeDescription * pParamTypeDescr = ppTempParamTypeDescr[nTempIndizes];

            if ( pParams[nIndex].bOut ) // inout/out
            {
                // convert and assign
                uno_destructData( pCppArgs[nIndex], pParamTypeDescr, cpp_release );
                uno_copyAndConvertData( pCppArgs[nIndex], pUnoArgs[nIndex], pParamTypeDescr,
                                        pThis->getBridge()->getUno2Cpp() );
            }
            // destroy temp uno param
            uno_destructData( pUnoArgs[nIndex], pParamTypeDescr, 0 );

            TYPELIB_DANGER_RELEASE( pParamTypeDescr );
        }
        // return
        if ( pCppReturn ) // has complex return
        {
            if ( pUnoReturn != pCppReturn ) // needs reconversion
            {
                uno_copyAndConvertData( pCppReturn, pUnoReturn, pReturnTypeDescr,
                                        pThis->getBridge()->getUno2Cpp() );
                // destroy temp uno return
                uno_destructData( pUnoReturn, pReturnTypeDescr, 0 );
            }
            // complex return ptr is set to return reg
            *reinterpret_cast<void **>(pRegisterReturn) = pCppReturn;
        }
        if ( pReturnTypeDescr )
        {
            typelib_TypeClass eRet = (typelib_TypeClass)pReturnTypeDescr->eTypeClass;
            TYPELIB_DANGER_RELEASE( pReturnTypeDescr );
            return eRet;
        }
        else
            return typelib_TypeClass_VOID;
    }
}


//==================================================================================================
extern "C" typelib_TypeClass cpp_vtable_call(
    sal_Int32 nFunctionIndex, sal_Int32 nVtableOffset,
    void ** gpreg, void ** fpreg, void ** ovrflw,
    void * pIndirectReturn, // AArch64 x8 indirect-result pointer (0 if none)
    sal_uInt64 * pRegisterReturn /* space for register return */ )
{
    // gpreg:  this, [other gpr params x0..x7]
    // fpreg:  [fpr params d0..d7]
    // ovrflw: [gpr or fpr params (properly aligned)]
    // pIndirectReturn: x8 (the hidden return buffer), when bit 0x80000000 set.
    //
    // On AArch64 'this' is ALWAYS x0 = gpreg[0]; the hidden return pointer is
    // the separate x8 register, not a displaced first GPR (unlike x86-64 SysV
    // where it occupied gpreg[0] and 'this' moved to gpreg[1]).
    if ( nFunctionIndex & 0x80000000 )
        nFunctionIndex &= 0x7fffffff;

    void * pThis = gpreg[0];
    pThis = static_cast<char *>( pThis ) - nVtableOffset;

    bridges::cpp_uno::shared::CppInterfaceProxy * pCppI =
        bridges::cpp_uno::shared::CppInterfaceProxy::castInterfaceToProxy( pThis );

    typelib_InterfaceTypeDescription * pTypeDescr = pCppI->getTypeDescr();

    OSL_ENSURE( nFunctionIndex < pTypeDescr->nMapFunctionIndexToMemberIndex, "### illegal vtable index!\n" );
    if ( nFunctionIndex >= pTypeDescr->nMapFunctionIndexToMemberIndex )
    {
        throw RuntimeException( OUString::createFromAscii("illegal vtable index!"),
                                reinterpret_cast<XInterface *>( pCppI ) );
    }

    // determine called method
    sal_Int32 nMemberPos = pTypeDescr->pMapFunctionIndexToMemberIndex[nFunctionIndex];
    OSL_ENSURE( nMemberPos < pTypeDescr->nAllMembers, "### illegal member index!\n" );

    TypeDescription aMemberDescr( pTypeDescr->ppAllMembers[nMemberPos] );

    typelib_TypeClass eRet;
    switch ( aMemberDescr.get()->eTypeClass )
    {
        case typelib_TypeClass_INTERFACE_ATTRIBUTE:
        {
            typelib_TypeDescriptionReference *pAttrTypeRef =
                reinterpret_cast<typelib_InterfaceAttributeTypeDescription *>( aMemberDescr.get() )->pAttributeTypeRef;

            if ( pTypeDescr->pMapMemberIndexToFunctionIndex[nMemberPos] == nFunctionIndex )
            {
                // is GET method
                eRet = cpp2uno_call( pCppI, aMemberDescr.get(), pAttrTypeRef,
                        0, 0, // no params
                        gpreg, fpreg, ovrflw, pIndirectReturn, pRegisterReturn );
            }
            else
            {
                // is SET method
                typelib_MethodParameter aParam;
                aParam.pTypeRef = pAttrTypeRef;
                aParam.bIn      = sal_True;
                aParam.bOut     = sal_False;

                eRet = cpp2uno_call( pCppI, aMemberDescr.get(),
                        0, // indicates void return
                        1, &aParam,
                        gpreg, fpreg, ovrflw, pIndirectReturn, pRegisterReturn );
            }
            break;
        }
        case typelib_TypeClass_INTERFACE_METHOD:
        {
            // is METHOD
            switch ( nFunctionIndex )
            {
                case 1: // acquire()
                    pCppI->acquireProxy(); // non virtual call!
                    eRet = typelib_TypeClass_VOID;
                    break;
                case 2: // release()
                    pCppI->releaseProxy(); // non virtual call!
                    eRet = typelib_TypeClass_VOID;
                    break;
                case 0: // queryInterface() opt
                {
                    // queryInterface([in] type) returns an Any (> 16 bytes),
                    // so on AArch64 the result buffer is x8 (pIndirectReturn),
                    // 'this' is gpreg[0], and the type argument is the first
                    // real parameter, gpreg[1].
                    typelib_TypeDescription * pTD = 0;
                    TYPELIB_DANGER_GET( &pTD, reinterpret_cast<Type *>( gpreg[1] )->getTypeLibType() );
                    if ( pTD )
                    {
                        XInterface * pInterface = 0;
                        (*pCppI->getBridge()->getCppEnv()->getRegisteredInterface)
                            ( pCppI->getBridge()->getCppEnv(),
                              reinterpret_cast<void **>(&pInterface),
                              pCppI->getOid().pData,
                              reinterpret_cast<typelib_InterfaceTypeDescription *>( pTD ) );

                        if ( pInterface )
                        {
                            ::uno_any_construct( reinterpret_cast<uno_Any *>( pIndirectReturn ),
                                                 &pInterface, pTD, cpp_acquire );

                            pInterface->release();
                            TYPELIB_DANGER_RELEASE( pTD );

                            reinterpret_cast<void **>( pRegisterReturn )[0] = pIndirectReturn;
                            eRet = typelib_TypeClass_ANY;
                            break;
                        }
                        TYPELIB_DANGER_RELEASE( pTD );
                    }
                } // else perform queryInterface()
                default:
                {
                    typelib_InterfaceMethodTypeDescription *pMethodTD =
                        reinterpret_cast<typelib_InterfaceMethodTypeDescription *>( aMemberDescr.get() );

                    eRet = cpp2uno_call( pCppI, aMemberDescr.get(),
                                         pMethodTD->pReturnTypeRef,
                                         pMethodTD->nParams,
                                         pMethodTD->pParams,
                                         gpreg, fpreg, ovrflw, pIndirectReturn, pRegisterReturn );
                }
            }
            break;
        }
        default:
        {
            throw RuntimeException( OUString::createFromAscii("no member description found!"),
                                    reinterpret_cast<XInterface *>( pCppI ) );
            // is here for dummy
            eRet = typelib_TypeClass_VOID;
        }
    }

    return eRet;
}

//==================================================================================================
// The incoming register-spill executor, implemented in call.s.  It is reached
// via BR from a per-slot snippet (codeSnippet below) with x16 carrying the
// packed (nVtableOffset << 32) | nFunctionIndex; it spills the argument
// registers and calls cpp_vtable_call.
extern "C" void privateSnippetExecutor( void );

// Each snippet is 5 AArch64 instructions (20 bytes) + 4 bytes padding to an
// 8-byte boundary + two 8-byte literals (the packed index and the executor
// address) = 40 bytes.
const int codeSnippetSize = 40;

// Generate a per-vtable-slot trampoline that loads the packed function index
// into x16 and branches to privateSnippetExecutor(), preserving every
// argument register.  Uses PC-relative literal loads because AArch64 cannot
// embed a 64-bit immediate in a single instruction.
//
// Layout (offsets in bytes from code):
//    0:  ldr  x16, #24      ; x16 = nOffsetAndIndex (literal at +24)
//    4:  ldr  x17, #28      ; x17 = privateSnippetExecutor (literal at +32)
//    8:  br   x17
//   12:  (unused / padding)
//   16:  (padding to 8-byte align the literals at 24)
//   24:  .quad nOffsetAndIndex
//   32:  .quad privateSnippetExecutor
//
// Note: the snippet creates no stack frame, so the C++ unwinder walks straight
// through it to the original caller (required for UNO exception propagation).
unsigned char * codeSnippet( unsigned char * code,
        sal_Int32 nFunctionIndex, sal_Int32 nVtableOffset,
        bool bHasHiddenParam ) SAL_THROW( () )
{
    sal_uInt64 nOffsetAndIndex = ( static_cast<sal_uInt64>( nVtableOffset ) << 32 ) | static_cast<sal_uInt64>( nFunctionIndex );

    if ( bHasHiddenParam )
        nOffsetAndIndex |= 0x80000000;

    sal_uInt32 * p = reinterpret_cast<sal_uInt32 *>( code );

    // ldr x16, #24  -> literal at code+24. imm19 = 24/4 = 6.
    //   encoding: 0x58000000 | (imm19 << 5) | Rt(16)
    p[0] = 0x58000000 | ( 6 << 5 ) | 16;
    // ldr x17, #28  -> literal at code+32 (relative to this insn at +4): 28.
    //   imm19 = 28/4 = 7.
    p[1] = 0x58000000 | ( 7 << 5 ) | 17;
    // br x17  -> 0xD61F0000 | (Rn(17) << 5)
    p[2] = 0xD61F0000 | ( 17 << 5 );
    // p[3] (offset 12) and p[4] (offset 16..20) are padding.
    p[3] = 0xD503201F; // NOP
    p[4] = 0xD503201F; // NOP

    // literals, 8-byte aligned at offset 24 and 32
    *reinterpret_cast<sal_uInt64 *>( code + 24 ) = nOffsetAndIndex;
    *reinterpret_cast<sal_uInt64 *>( code + 32 ) = reinterpret_cast<sal_uInt64>( privateSnippetExecutor );

    return code + codeSnippetSize;
}

//==================================================================================================
struct bridges::cpp_uno::shared::VtableFactory::Slot { void * fn; };

bridges::cpp_uno::shared::VtableFactory::Slot *
bridges::cpp_uno::shared::VtableFactory::mapBlockToVtable(void * block)
{
    return static_cast< Slot * >(block) + 2;
}

//==================================================================================================
sal_Size bridges::cpp_uno::shared::VtableFactory::getBlockSize(
    sal_Int32 slotCount)
{
    return (slotCount + 2) * sizeof (Slot) + slotCount * codeSnippetSize;
}

//==================================================================================================
bridges::cpp_uno::shared::VtableFactory::Slot *
bridges::cpp_uno::shared::VtableFactory::initializeBlock(
    void * block, sal_Int32 slotCount)
{
    Slot * slots = mapBlockToVtable(block);
    slots[-2].fn = 0;
    slots[-1].fn = 0;
    return slots + slotCount;
}

//==================================================================================================

unsigned char * bridges::cpp_uno::shared::VtableFactory::addLocalFunctions(
    Slot ** slots, unsigned char * code, /*sal_PtrDiff writetoexecdiff,*/
    typelib_InterfaceTypeDescription const * type, sal_Int32 nFunctionOffset,
    sal_Int32 functionCount, sal_Int32 nVtableOffset )
{
    const sal_PtrDiff writetoexecdiff = 0;
    (*slots) -= functionCount;
    Slot * s = *slots;
    for ( sal_Int32 nPos = 0; nPos < type->nMembers; ++nPos )
    {
        typelib_TypeDescription * pTD = 0;

        TYPELIB_DANGER_GET( &pTD, type->ppMembers[ nPos ] );
        OSL_ASSERT( pTD );

        if ( typelib_TypeClass_INTERFACE_ATTRIBUTE == pTD->eTypeClass )
        {
            typelib_InterfaceAttributeTypeDescription *pAttrTD =
                reinterpret_cast<typelib_InterfaceAttributeTypeDescription *>( pTD );

            // get method
            (s++)->fn = code + writetoexecdiff;
            code = codeSnippet( code, nFunctionOffset++, nVtableOffset,
                                aarch64::return_in_hidden_param( pAttrTD->pAttributeTypeRef ) );

            if ( ! pAttrTD->bReadOnly )
            {
                // set method
                (s++)->fn = code + writetoexecdiff;
                code = codeSnippet( code, nFunctionOffset++, nVtableOffset, false );
            }
        }
        else if ( typelib_TypeClass_INTERFACE_METHOD == pTD->eTypeClass )
        {
            typelib_InterfaceMethodTypeDescription *pMethodTD =
                reinterpret_cast<typelib_InterfaceMethodTypeDescription *>( pTD );

            (s++)->fn = code + writetoexecdiff;
            code = codeSnippet( code, nFunctionOffset++, nVtableOffset,
                                aarch64::return_in_hidden_param( pMethodTD->pReturnTypeRef ) );
        }
        else
            OSL_ASSERT( false );

        TYPELIB_DANGER_RELEASE( pTD );
    }
    return code;
}

//==================================================================================================
void bridges::cpp_uno::shared::VtableFactory::flushCode(
    unsigned char const *, unsigned char const * )
{
}