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annotate tests/agcl/ffcalc/ffcx-t.syn @ 15:f5acaf0c8a29

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Don't cast through "volatile int". Causes a gcc warning nowadays. XXX: should put something else back here to frighten the optimizer
author David A. Holland
date Tue, 31 May 2022 01:00:55 -0400
parents 13d2b8934445
children
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1 {/* FOUR FUNCTION CALCULATOR: FFCALCX.SYN */}
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2
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3 // -- CONFIGURATION SECTION ----------------------------
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4 [
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5 default token type = double
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6 disregard white space
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7 lexeme { real}
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8 traditional engine
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9 left { '+', '-'}
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10 left { '*', '/'}
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11 right {unary minus}
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12 ]
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13
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14 // -- FOUR FUNCTION CALCULATOR -------------------------
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15 (void) calculator $
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16 -> [calculation?, '\n']..., eof
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17
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18 (void) calculation
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19 -> expression:x =printf("%g\n",x);
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20 -> name:n, '=', expression:x ={
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21 printf("%c = %g\n",n+'A',value[n]=x);}
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22 -> error
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23
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24 expression
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25 -> name:n = value[n];
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26 -> real
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27 -> '(', expression:x, ')' = x;
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28 -> expression:x, '+', expression:t = x+t;
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29 -> expression:x, '-', expression:t = x-t;
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30 -> expression:t, '*', expression:f = t*f;
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31 -> expression:t, '/', expression:f = t/f;
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32 -> unary minus, expression:f = -f;
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33
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34 // -- LEXICAL UNITS ------------------------------------
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35 digit = '0-9'
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36 eof = -1
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37 unary minus = '-'
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38
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39 (void) white space
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40 -> ' ' + '\t' + '\r' + '\f' + '\v'
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41 -> "/*", ~eof?..., "*/"
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42
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43 (int) name
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44 -> 'a-z' + 'A-Z':c = c-'A';
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45
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46 real
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47 -> integer part:i, '.', fraction part:f = i+f;
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48 -> integer part, '.'?
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49 -> '.', fraction part:f = f;
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50
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51 integer part
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52 -> digit:d = d-'0';
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53 -> integer part:x, digit:d = 10*x + d-'0';
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54
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55 fraction part
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56 -> digit:d =(d-'0')/10.;
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57 -> digit:d, fraction part:f =(d-'0' + f)/10.;
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58
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59 { /* -- EMBEDDED C ---------------------------------- */
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60 double value[64]; /* registers */
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61 int main(void) {
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62 ffcalcx();
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63 return 0;
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64 }
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65 } /* -- END OF EMBEDDED C ----------------------------*/