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Annotation of 42BSD/ucb/pascal/pdx/tree/assign.c, revision 1.1

1.1     ! root        1: /* Copyright (c) 1982 Regents of the University of California */
        !             2: 
        !             3: static char sccsid[] = "@(#)assign.c 1.1 1/18/82";
        !             4: 
        !             5: /*
        !             6:  * assign the value of an expression to a variable (or term)
        !             7:  */
        !             8: 
        !             9: #include "defs.h"
        !            10: #include "tree.h"
        !            11: #include "sym.h"
        !            12: #include "process.h"
        !            13: #include "tree.rep"
        !            14: 
        !            15: assign(var, exp)
        !            16: NODE *var;
        !            17: NODE *exp;
        !            18: {
        !            19:        ADDRESS addr;
        !            20:        int varsize;
        !            21:        char cvalue;
        !            22:        short svalue;
        !            23:        long lvalue;
        !            24: 
        !            25:        if (!compatible(var->nodetype, exp->nodetype)) {
        !            26:                error("incompatible types");
        !            27:        }
        !            28:        addr = lval(var);
        !            29:        eval(exp);
        !            30:        varsize = size(var->nodetype);
        !            31:        if (varsize < sizeof(long)) {
        !            32:                lvalue = pop(long);
        !            33:                switch (varsize) {
        !            34:                        case sizeof(char):
        !            35:                                cvalue = lvalue;
        !            36:                                dwrite(&cvalue, addr, varsize);
        !            37:                                break;
        !            38: 
        !            39:                        case sizeof(short):
        !            40:                                svalue = lvalue;
        !            41:                                dwrite(&svalue, addr, varsize);
        !            42:                                break;
        !            43: 
        !            44:                        default:
        !            45:                                panic("bad size %d", varsize);
        !            46:                }
        !            47:        } else {
        !            48:                sp -= varsize;
        !            49:                dwrite(sp, addr, varsize);
        !            50:        }
        !            51: }

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