95 lines
3.1 KiB
C
95 lines
3.1 KiB
C
/* $Header$ */
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/* expression operators. Do not change values, as they are used as
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indices into arrays.
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*/
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#define E_NOT 1
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#define E_DEREF 2
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#define E_AND 3
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#define E_OR 4
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#define E_DIV 5 /* equal to truncated quotient */
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#define E_MOD 6 /* x = (x E_DIV y) * y + x E_MOD y,
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0 <= (x E_MOD y) < y
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*/
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#define E_ZDIV 7 /* quotient rounded to 0 */
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#define E_ZMOD 8 /* remainder of E_ZDIV */
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#define E_IN 9 /* set membership */
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#define E_ARRAY 10
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#define E_PLUS 11
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#define E_MIN 12
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#define E_MUL 13
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#define E_EQUAL 14
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#define E_NOTEQUAL 15
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#define E_LTEQUAL 16
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#define E_GTEQUAL 17
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#define E_LT 18
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#define E_GT 19
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#define E_SELECT 20
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#define E_BAND 21 /* bitwise and */
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#define E_BOR 22 /* bitwise or */
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#define E_BXOR 23
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#define E_BNOT 24
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#define E_DERSELECT 25 /* -> in C */
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#define E_LSFT 26
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#define E_RSFT 27
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#define E_ADDR 28
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/* long get_int(char *buf, long size, int class)
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Returns the value of size 'size', residing in 'buf', of 'class'
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T_INTEGER, T_UNSIGNED, or T_ENUM.
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*/
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extern long get_int();
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/* int put_int(char *buf, long size, long value)
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Stores the value 'value' of size 'size' in 'buf'.
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*/
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extern int put_int();
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/* double get_real(char *buf, long size)
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Returns the real value of size 'size', residing in 'buf'.
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T_INTEGER, T_UNSIGNED, or T_ENUM.
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*/
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extern double get_real();
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/* int put_real(char *buf, long size, double value)
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Stores the value 'value' of size 'size' in 'buf'.
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*/
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extern int put_real();
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/* int eval_cond(p_tree p)
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This routine evaluates the conditional expression indicated by p
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and returns 1 if it evaluates to TRUE, or 0 if it could not be
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evaluated for some reason or if it evalutes to FALSE.
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If the expression cannot be evaluated, an error message is given.
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*/
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extern int eval_cond();
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/* int eval_desig(p_tree p, t_addr *pbuf, long **psize, p_type *ptp)
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This routine evaluates the expression indicated by p, which should
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result in a designator. The result of the expression is an address
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which is to be found in *pbuf. *psize will contain the size of the
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designated object, and *ptp its type.
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If the expression cannot be evaluated or does not result in a
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designator, 0 is returned and an error message is given.
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Otherwise, 1 is returned.
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*/
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extern int eval_desig();
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/* int eval_expr(p_tree p, char **pbuf, long **psize, p_type *ptp)
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This routine evaluates the expression indicated by p.
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The result of the expression is left in *pbuf.
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*psize will contain the size of the value, and *ptp its type.
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If the expression cannot be evaluated, 0 is returned and an error
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message is given. Otherwise, 1 is returned.
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*/
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extern int eval_expr();
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/* int convert(char **pbuf, long *psize, p_type *ptp, p_type tp, long size)
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This routine tries to convert the value in pbuf of size psize
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and type ptp to type tp with size size. It returns 0 if this fails,
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while producing an error message. Otherwise, it returns 1 and
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the resulting value, type and size are left in pbuf, ptp, and
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psize, respectively.
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*/
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extern int convert();
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