intrnsc.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 108 行

/****************************************************************************
*
*                            Open Watcom Project
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*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*  ========================================================================
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*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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//
// INTRNSC   : intrinsic functions
//

#include "ftnstd.h"
#include "errcod.h"
#include "global.h"
#include "namecod.h"
#include "recog.h"
#include "types.h"
#include "iflookup.h"
#include "ferror.h"
#include "insert.h"
#include "utility.h"

extern  sym_id          LkSym(void);

#define ERR_MASK        (SY_IN_EC | SY_SUB_PARM)


void    CpIntrinsic(void) {
//=====================

// Compile INTRINSIC statement.

//     INTRINSIC FUNC {,FUNC1} . . .

    unsigned_16 flags;
    IFF         func;
    sym_id      sym_ptr;
    TYPE        func_typ;

    for(;;) {
        if( ReqName( NAME_INTRINSIC ) ) {
            func = IFLookUp();
            if( func > 0 ) {
                func_typ = IFType( func );
                sym_ptr = LkSym();
                flags = sym_ptr->ns.flags;
                if( ( flags & SY_USAGE ) != 0 ) {
                    if( ( flags & SY_CLASS ) == SY_SUBPROGRAM ) {
                        if( ( flags & SY_INTRINSIC ) != 0 ) {
                            Error( SR_PREV_INTRNSC );
                        } else if( ( flags & SY_EXTERNAL ) != 0 ) {
                            Error( SR_INTRNSC_EXTRN );
                        }
                    } else {
                        IllName( sym_ptr );
                    }
                } else if( flags & ERR_MASK ) {
                    IllName( sym_ptr );
                } else if( ( flags & SY_TYPE ) &&
                           ( sym_ptr->ns.typ != func_typ ) ) {
                    NameTypeErr( TY_TYP_PREV_DEF, sym_ptr );
                } else {
                    // we must OR the flags since SY_TYPE and/or SY_REFERENCED
                    // bit might already be set in the symbol table
                    sym_ptr->ns.flags |= SY_USAGE | SY_SUBPROGRAM |
                                         SY_FUNCTION | SY_INTRINSIC;
                    func_typ = IFType( func );
                    sym_ptr->ns.typ = func_typ;
                    sym_ptr->ns.xt.size = TypeSize( func_typ );
                    sym_ptr->ns.si.fi.index = func;
                }
            } else {
                Error( SR_NOT_INTRNSC );
            }
        }
        AdvanceITPtr();
        if( !RecComma() ) {
            break;
        }
    }
    ReqEOS();
}