cpragppc.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 446 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
*    NON-INFRINGEMENT. Please see the License for the specific language
*    governing rights and limitations under the License.
*
*  ========================================================================
*
* Description:  PowerPC target specific pragma processing.
*
****************************************************************************/


#include "cvars.h"
#include "cgswitch.h"
#include "pragdefn.h"
#include "pdefn2.h"
#include "asinline.h"
#include "asmstmt.h"
#include <ctype.h>

static  hw_reg_set      AsmRegsSaved = HW_D( HW_FULL );
static  int             AsmFuncNum;
static  struct aux_info AuxInfo;

//static struct {
//    unsigned    f_returns : 1;
//    unsigned    f_streturn : 1;
//} AuxInfoFlg;

void AsmWarning( char *msg )
/**************************/
{
    CWarn( WARN_ASSEMBLER_WARNING, ERR_ASSEMBLER_WARNING, msg );
}

uint_32 AsmQuerySPOffsetOf( char *name )
/**************************************/
{
// CC provides this
    return( 0 );
}

void PragmaInit( void )
/*********************/
{
    AsmFuncNum = 0;
}

static void InitAuxInfo( void )
{
    CurrAlias   = NULL;
    CurrInfo    = NULL;
    CurrEntry   = NULL;

    memset( &AuxInfo, 0, sizeof( AuxInfo ) );

//    AuxInfoFlg.f_returns    = 0;
//    AuxInfoFlg.f_streturn   = 0;
}

static void AdvanceToken( void )
{
    CMemFree( SavedId );
    SavedId = NULL;
    CurToken = LAToken;
}

static void CopyAuxInfo( void )
{
    if( CurrEntry == NULL ) {
        // Redefining a built-in calling convention
    } else {
        CurrInfo = (struct aux_info *)CMemAlloc( sizeof( struct aux_info ) );
        *CurrInfo = *CurrAlias;
    }
    if( AuxInfo.code != NULL ) {
        CurrInfo->code = AuxInfo.code;
    }
    CurrInfo->cclass |= AuxInfo.cclass;
    if( AuxInfo.objname != NULL )
        CurrInfo->objname = AuxInfo.objname;
//    if( AuxInfoFlg.f_returns )
//        CurrInfo->returns = AuxInfo.returns;
//    if( AuxInfoFlg.f_streturn )
//        CurrInfo->streturn = AuxInfo.streturn;
//    if( AuxInfo.parms != NULL )
//        CurrInfo->parms = AuxInfo.parms;
//    if( !HW_CEqual( AuxInfo.save, HW_EMPTY ) ) {
//        HW_TurnOff( CurrInfo->save, AuxInfo.save );
//    }
}

static int GetAliasInfo( void )
/*****************************/
{
    if( CurToken != T_LEFT_PAREN )          // #pragma aux symbol .....
        return( 1 );
    NextToken();
    if( CurToken != T_ID )                  // error
        return( 0 );
    LookAhead();
    if( LAToken == T_RIGHT_PAREN ) {        // #pragma aux (alias) symbol .....
        PragCurrAlias( SavedId );
        AdvanceToken();
        NextToken();
        return( 1 );
    } else if( LAToken == T_COMMA ) {       // #pragma aux (symbol, alias)
        HashValue = SavedHash;
        SetCurrInfo( SavedId );
        AdvanceToken();
        NextToken();
        if( CurToken != T_ID )              // error
            return( 0 );
        PragCurrAlias( Buffer );
        NextToken();
        if( CurToken == T_RIGHT_PAREN )
            NextToken();
        CopyAuxInfo();
        PragEnding();
        return( 0 ); /* process no more! */
    } else {                                // error
        AdvanceToken();
        return( 0 ); // shut up the compiler
    }
}

enum sym_state AsmQueryExternal( char *name )
/*******************************************/
{
    SYM_HANDLE sym_handle;
    auto SYM_ENTRY sym;

    sym_handle = SymLook( CalcHash( name, strlen( name ) ), name );
    if( sym_handle == 0 )
        return( SYM_UNDEFINED );
    SymGet( &sym, sym_handle );
    if( !(sym.flags & SYM_REFERENCED) ) {
        sym.flags |= SYM_REFERENCED;
        SymReplace( &sym, sym_handle );
    }
    switch( sym.stg_class ) {
    case SC_AUTO:
    case SC_REGISTER:
        return( SYM_STACK );
    default:
        break;
    }
    return( SYM_EXTERNAL );
}

local void FreeAsmFixups( void )
/******************************/
{
    asmreloc    *reloc, *next;
    for( reloc = AsmRelocs; reloc; reloc = next ) {
        next = reloc->next;
//      AsmFree( reloc->name );       this routine should be in asm
//      AsmFree( reloc );
    }
//  AsmRelocs = NULL;
}

hw_reg_set PragRegName( char *str )
/*********************************/
{
    int         index;
    char        *p;
    hw_reg_set  name;

    if( *str == '\0' ) {
        HW_CAsgn( name, HW_EMPTY );
        return( name );
    }
    if( *str == '_' ) {
        ++str;
        if( *str == '_' ) {
            ++str;
        }
    }
    // search alias name
    p = Registers;
    index = *(p++);
    while( *p != '\0' ) {
        if( strcmp( p, str ) == 0 )
            return( RegBits[ index ] );
        while( *(p++) != '\0' )
            ;
        index = *(p++);
    }
    // decode regular register name
    if( *str == 'r' || *str == 'R' )
        ++str;
    // decode regular register index
    if( isdigit( *str ) ) {
        index = atoi( str );
        if( str[ 1 ] == '\0' ) {
            //  0....9
            if(( index > 0 )
              || ( index == 0 ) && ( str[ 0 ] == '0' )) {
                return( RegBits[ index ] );
            }
        } else if( str[ 2 ] == '\0' ) {
            // 10....31
            if(( index > 9 ) && ( index < 32 )) {
                return( RegBits[ index ] );
            }
        }
    }
    if( *(str - 1) == 'r' && *(str - 1) == 'R' ) {
        --str;
    }
    CErr2p( ERR_BAD_REGISTER_NAME, str );
    HW_CAsgn( name, HW_EMPTY );
    return( name );
}

static byte_seq_reloc *GetFixups( void )
/**************************************/
{
    asmreloc        *reloc;
    byte_seq_reloc  *head,*new;
    byte_seq_reloc  **lnk;
    SYM_HANDLE      sym_handle;

    head = NULL;
    lnk = &head;
    for( reloc = AsmRelocs; reloc; reloc = reloc->next ) {
        new = CMemAlloc( sizeof( byte_seq_reloc ) );
        sym_handle = SymLook( CalcHash( reloc->name, strlen( reloc->name ) ), reloc->name );
        new->off = reloc->offset;
        new->type = reloc->type;
        new->sym = (void *)sym_handle;
        new->next = NULL;
        *lnk = new;
        lnk = &new->next;
    }
    return( head );
}

local int GetByteSeq( risc_byte_seq **code )
/******************************************/
{
    auto unsigned char  buff[ MAXIMUM_BYTESEQ + 32 ];
    int                 uses_auto;
    char                too_many_bytes;

    AsmSysInit( buff );
    CompFlags.pre_processing = 1;       /* enable macros */
    NextToken();
    too_many_bytes = 0;
    uses_auto = 0;
    for(;;) {
        if( CurToken == T_STRING ) {    /* 06-sep-91 */
            AsmLine( Buffer );
            NextToken();
            if( CurToken == T_COMMA ) {
                NextToken();
            }
        } else if( CurToken == T_CONSTANT ) {
            AsmCodeBuffer[AsmCodeAddress++] = Constant;
            NextToken();
        } else {
            break;
        }
        if( AsmCodeAddress > MAXIMUM_BYTESEQ ) {
            if( ! too_many_bytes ) {
                CErr1( ERR_TOO_MANY_BYTES_IN_PRAGMA );
                too_many_bytes = 1;
            }
            AsmCodeAddress = 0; // reset index to we don't overrun buffer
        }
    }
    if( too_many_bytes ) {
        uses_auto = 0;
    } else {
        risc_byte_seq *seq;
        uint_32       len;

        len = AsmCodeAddress;
        seq = (risc_byte_seq *) CMemAlloc( sizeof( risc_byte_seq ) + len );
        seq->relocs = GetFixups();
        seq->length = len;
        memcpy( &seq->data[0], buff, len );
        *code = seq;
    }
    FreeAsmFixups();
    CompFlags.pre_processing = 2;
    AsmSysFini();
    return( uses_auto );
}

void PragAux( void )
/******************/
{
    struct {
        unsigned f_export : 1;
        unsigned f_parm   : 1;
        unsigned f_value  : 1;
        unsigned f_modify : 1;
        unsigned f_frame  : 1;
        unsigned uses_auto: 1;
    } have;

    InitAuxInfo();
    if( !GetAliasInfo() )
        return;
    if( CurToken != T_ID )
        return;
    SetCurrInfo( Buffer );
    NextToken();
    PragObjNameInfo( &AuxInfo.objname );
    have.f_export = 0;
    have.f_parm   = 0;
    have.f_value  = 0;
    have.f_modify = 0;
    have.f_frame = 0;
    have.uses_auto = 0; /* BBB - Jan 26, 1994 */
    for( ;; ) {
        if( CurToken == T_EQUAL ) {
            have.uses_auto = GetByteSeq( &AuxInfo.code );
        } else if( !have.f_export && PragRecog( "export" ) ) {
            AuxInfo.cclass |= DLL_EXPORT;
            have.f_export = 1;
        } else if( !have.f_parm && PragRecog( "parm" ) ) {
//          GetParmInfo();
            have.f_parm = 1;
        } else if( !have.f_value && PragRecog( "value" ) ) {
//          GetRetInfo();
            have.f_value = 1;
        } else if( !have.f_value && PragRecog( "aborts" ) ) {
            AuxInfo.cclass |= SUICIDAL;
            have.f_value = 1;
        } else if( !have.f_modify && PragRecog( "modify" ) ) {
//          GetSaveInfo();
            have.f_modify = 1;
        } else if( !have.f_frame && PragRecog( "frame" ) ) {
//          AuxInfo.cclass |= GENERATE_STACK_FRAME;
            have.f_frame = 1;
        } else {
            break;
        }
    }
    if( have.uses_auto ) {
        /*
           We want to force the calling routine to set up a [E]BP frame
           for the use of this pragma. This is done by saying the pragma
           modifies the [E]SP register. A kludge, but it works.
        */
//      HW_CTurnOn( AuxInfo.save, HW_SP );
    }
    CopyAuxInfo();
    PragEnding();
}

void AsmSysInit( unsigned char *buf )
/***********************************/
{
    AsmInit();
    AsmCodeBuffer = buf;
    AsmCodeAddress = 0;
}

void AsmSysFini( void )
/*********************/
{
    AsmFini();
}

void AsmSysMakeInlineAsmFunc( int too_many_bytes )
/************************************************/
{
    int                 code_length;
    SYM_HANDLE          sym_handle;
    TREEPTR             tree;
    int                 uses_auto;
    auto char           name[8];

    uses_auto = 0;
    code_length = AsmCodeAddress;
    if( code_length != 0 ) {
        sprintf( name, "F.%d", AsmFuncNum );
        ++AsmFuncNum;
        CreateAux( name );
        CurrInfo = (struct aux_info *)CMemAlloc( sizeof( struct aux_info ) );
        *CurrInfo = WatcallInfo;
        CurrInfo->use = 1;
        CurrInfo->save = AsmRegsSaved;  // indicate no registers saved
        if( too_many_bytes ) {
             uses_auto = 0;
        } else {
            risc_byte_seq *seq;

            seq = (risc_byte_seq *) CMemAlloc( sizeof( risc_byte_seq ) + code_length );
            seq->relocs = GetFixups();
            seq->length = code_length;
            memcpy( &seq->data[0], AsmCodeBuffer, code_length );
            CurrInfo->code = seq;
        }
        FreeAsmFixups();
        if( uses_auto ) {
            /*
               We want to force the calling routine to set up a [E]BP frame
               for the use of this pragma. This is done by saying the pragma
               modifies the [E]SP register. A kludge, but it works.
            */
//          HW_CTurnOff( CurrInfo->save, HW_SP );
        }
        CurrEntry->info = CurrInfo;
        CurrEntry->next = AuxList;
        AuxList = CurrEntry;
        CurrEntry = NULL;
        sym_handle = MakeFunction( CStrSave( name ),
                        FuncNode( GetType( TYPE_VOID ), 0, NULL ) );
        tree = LeafNode( OPR_FUNCNAME );
        tree->op.sym_handle = sym_handle;
        tree = ExprNode( tree, OPR_CALL, NULL );
        tree->expr_type = GetType( TYPE_VOID );
        AddStmt( tree );
    }
}

char const *AsmSysDefineByte( void )
/**********************************/
{
    return( ".byte " );
}