callinfo.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 456 行 · 第 1/2 页

                         //NO_FLOAT_REG_RETURNS |
                         //NO_STRUCT_REG_RETURNS |
                         //ROUTINE_RETURN |
                         //NO_8087_RETURNS |
                         //SPECIAL_RETURN |
                         SPECIAL_STRUCT_RETURN;
    FastcallInfo.parms = FastcallParms;
    FastcallInfo.objname = AUX_STRALLOC( "@*" );

    HW_CAsgn( FastcallInfo.returns, HW_EMPTY );
    HW_CAsgn( FastcallInfo.streturn, HW_EMPTY );
    HW_TurnOn( FastcallInfo.save, full_no_segs );
    HW_CTurnOff( FastcallInfo.save, HW_FLTS );
    HW_CTurnOff( StdcallInfo.save, HW_ABCD );
    HW_CTurnOff( StdcallInfo.save, HW_ES );
#endif

/*************************************************
 *  _Optlink calling convention
 *************************************************/
    OptlinkInfo.cclass =  call_type |
#ifdef PARMS_STACK_RESERVE
                         PARMS_STACK_RESERVE |
#endif
                         //REVERSE_PARMS |
                         CALLER_POPS  |
                         //GENERATE_STACK_FRAME |
                         //NO_FLOAT_REG_RETURNS |
                         NO_STRUCT_REG_RETURNS |
                         //ROUTINE_RETURN |
                         //NO_8087_RETURNS |
                         //SPECIAL_RETURN |
                         SPECIAL_STRUCT_RETURN;
#if _CPU == 386
    OptlinkInfo.parms = OptlinkParms;
#else
    OptlinkInfo.parms = StackParms;
#endif
    OptlinkInfo.objname = AUX_STRALLOC( "*" );

    HW_CAsgn( OptlinkInfo.returns, HW_EMPTY );
//    HW_CAsgn( OptlinkInfo.returns, HW_FLTS );
    HW_CAsgn( OptlinkInfo.streturn, HW_EMPTY );
    HW_TurnOn( OptlinkInfo.save, full_no_segs );
    HW_CTurnOff( OptlinkInfo.save, HW_FLTS );
#if _CPU == 386
    HW_CTurnOff( OptlinkInfo.save, HW_EAX );
//    HW_CTurnOff( OptlinkInfo.save, HW_EBX );
    HW_CTurnOff( OptlinkInfo.save, HW_ECX );
    HW_CTurnOff( OptlinkInfo.save, HW_EDX );
#else
    HW_CTurnOff( OptlinkInfo.save, HW_ABCD );
    HW_CTurnOff( OptlinkInfo.save, HW_ES );
#endif

/*************************************************
 *  __syscall calling convention
 *************************************************/
    SyscallInfo.cclass =  call_type |
                         //REVERSE_PARMS |
                         CALLER_POPS |
                         //GENERATE_STACK_FRAME |
                         //NO_FLOAT_REG_RETURNS |
                         NO_STRUCT_REG_RETURNS |
                         //ROUTINE_RETURN |
                         //NO_8087_RETURNS |
                         //SPECIAL_RETURN |
                         SPECIAL_STRUCT_RETURN;
    SyscallInfo.parms = StackParms;
    SyscallInfo.objname = AUX_STRALLOC( "*" );

    HW_CAsgn( SyscallInfo.returns, HW_EMPTY );
    HW_CAsgn( SyscallInfo.streturn, HW_EMPTY );
    HW_TurnOn( SyscallInfo.save, full_no_segs );
    HW_CTurnOff( SyscallInfo.save, HW_FLTS );
#if _CPU == 386
    HW_CTurnOff( SyscallInfo.save, HW_EAX );
//    HW_CTurnOff( SyscallInfo.save, HW_EBX );
    HW_CTurnOff( SyscallInfo.save, HW_ECX );
    HW_CTurnOff( SyscallInfo.save, HW_EDX );
#else
    HW_CTurnOff( SyscallInfo.save, HW_ABCD );
    HW_CTurnOff( SyscallInfo.save, HW_ES );
#endif

#if _CPU == 386
/****************************************************
 *  OS/2 32-bit->16-bit calling convention ( _Far16 )
 ****************************************************/
    /* these are internal, and will never be pointed to by
     * an aux_entry, so we don't have to worry about them
     */

    Far16CdeclInfo = CdeclInfo;
    Far16CdeclInfo.cclass |= FAR16_CALL;
    Far16CdeclInfo.parms = StackParms;
    Far16CdeclInfo.objname = AUX_STRALLOC( CdeclInfo.objname );
    // __far16 __cdecl depends on EBX being trashed in __cdecl
    // but NT 386 __cdecl preserves EBX
    HW_CTurnOff( Far16CdeclInfo.save, HW_EBX );

    Far16PascalInfo = PascalInfo;
    Far16PascalInfo.cclass |= FAR16_CALL;
    Far16PascalInfo.parms = StackParms;
    Far16PascalInfo.objname = AUX_STRALLOC( PascalInfo.objname );
#endif
}

#if _CPU == 386
void SetAuxStackConventions( void )
/*********************************/
{
    WatcallInfo.cclass &= ( GENERATE_STACK_FRAME | FAR );
    WatcallInfo.cclass |= CALLER_POPS | NO_8087_RETURNS;
    WatcallInfo.parms = metaWareParms;
    HW_CTurnOff( WatcallInfo.save, HW_EAX );
    HW_CTurnOff( WatcallInfo.save, HW_EDX );
    HW_CTurnOff( WatcallInfo.save, HW_ECX );
    HW_CTurnOff( WatcallInfo.save, HW_FLTS );
    WatcallInfo.objname = AUX_STRALLOC( "*" );
}
#endif

#endif

int IsAuxParmsBuiltIn( hw_reg_set *parms )
/***************************************/
{
    if( parms == DefaultParms ) {
        return( TRUE );
#if _INTEL_CPU
    } else if( parms == StackParms ) {
        return( TRUE );
    } else if( parms == FastcallParms ) {
        return( TRUE );
#if _CPU == 386
    } else if( parms == OptlinkParms ) {
        return( TRUE );
    } else if( parms == metaWareParms ) {
        return( TRUE );
#endif
#endif
    } else if( parms == NULL ) {
        return( TRUE );
    } else {
        return( FALSE );
    }
}

void SetAuxWatcallInfo( void )
/****************************/
{
    DftCallConv         = &WatcallInfo;

    WatcallInfo.cclass  = 0;
    WatcallInfo.code    = NULL;
    WatcallInfo.parms   = DefaultParms;
#if _CPU == 370
    WatcallInfo.linkage = &DefaultLinkage;
#endif
    HW_CAsgn( WatcallInfo.returns, HW_EMPTY );
    HW_CAsgn( WatcallInfo.streturn, HW_EMPTY );
    HW_CAsgn( WatcallInfo.save, HW_FULL );
    WatcallInfo.use     = 0;
    WatcallInfo.objname = NULL;
}

void SetAuxDefaultInfo( void )
/****************************/
{
    DefaultInfo = *DftCallConv;
    if( DefaultInfo.objname != NULL ) {
        DefaultInfo.objname = AUX_STRALLOC( DefaultInfo.objname );
    }
}

int IsAuxInfoBuiltIn( struct aux_info *inf )
/*****************************************/
{
    if( inf == &DefaultInfo )
        return( TRUE );
    if( inf == &WatcallInfo )
        return( TRUE );
    if( inf == &CdeclInfo )
        return( TRUE );
    if( inf == &PascalInfo )
        return( TRUE );
    if( inf == &FortranInfo )
        return( TRUE );
    if( inf == &SyscallInfo )
        return( TRUE );
    if( inf == &StdcallInfo )
        return( TRUE );
    if( inf == &FastcallInfo )
        return( TRUE );
    if( inf == &OptlinkInfo )
        return( TRUE );
#if _CPU == 386
    if( inf == &Far16PascalInfo )
        return( TRUE );
    if( inf == &Far16CdeclInfo )
        return( TRUE );
#endif
    return( FALSE );
}

/* Variables need name mangling different from functions in many cases
 * (__pascal, __stdcall, etc.). Note that _System and _Optlink do not
 * decorate variable names. This is required for OS/2 SOM support to work
 * and useful for interoperability with IBM compilers.
 * NB: WatcallInfo.objname value depends on the -3r/3s switch.
 */
char *VarNamePattern( struct aux_info *inf )
/******************************************/
{
    if( inf == &DefaultInfo )
        inf = DftCallConv;
    if( inf == &WatcallInfo )
        return( WatcallInfo.objname );
    if( inf == &CdeclInfo || inf == &StdcallInfo || inf == &FastcallInfo )
        return( "_*" );
    if( inf == &PascalInfo  || inf == &FortranInfo )
        return( "^" );
    if( inf == &SyscallInfo || inf == &OptlinkInfo )
        return( "*" );
    return( inf->objname );
}