1127 lines
21 KiB
C
1127 lines
21 KiB
C
/* $Header$ */
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/* This file contains the expression evaluator. It exports four routines:
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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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- 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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- 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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- 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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#include <stdio.h>
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#include <alloc.h>
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#include <assert.h>
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#include "position.h"
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#include "operator.h"
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#include "tree.h"
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#include "expr.h"
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#include "symbol.h"
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#include "type.h"
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#include "langdep.h"
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extern FILE *db_out;
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/* buffer to integer and vice versa routines */
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static long
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get_int(buf, size, class)
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char *buf;
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long size;
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{
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long l;
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switch((int)size) {
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case sizeof(char):
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l = *buf;
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if (class == T_INTEGER && l >= 0x7F) l -= 256;
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else if (class != T_INTEGER && l < 0) l += 256;
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break;
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case sizeof(short):
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l = *((short *) buf);
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if (class == T_INTEGER && l >= 0x7FFF) l -= 65536;
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else if (class != T_INTEGER && l < 0) l += 65536;
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break;
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default:
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l = *((long *) buf);
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}
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return l;
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}
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static
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put_int(buf, size, value)
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char *buf;
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long size;
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long value;
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{
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switch((int)size) {
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case sizeof(char):
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*buf = value;
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break;
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case sizeof(short):
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*((short *) buf) = value;
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break;
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default:
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*((long *) buf) = value;
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break;
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}
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/*NOTREACHED*/
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}
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/* buffer to real and vice versa routines */
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static double
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get_real(buf, size)
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char *buf;
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long size;
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{
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switch((int) size) {
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case sizeof(float):
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return *((float *) buf);
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default:
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return *((double *) buf);
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}
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/*NOTREACHED*/
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}
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static
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put_real(buf, size, value)
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char *buf;
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long size;
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double value;
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{
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switch((int)size) {
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case sizeof(float):
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*((float *) buf) = value;
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break;
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default:
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*((double *) buf) = value;
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break;
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}
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/* NOTREACHED */
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}
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int
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convert(pbuf, psize, ptp, tp, size)
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char **pbuf;
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long *psize;
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p_type *ptp;
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p_type tp;
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long size;
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{
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/* Convert the value in pbuf, of size psize and type ptp, to type
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tp and leave the resulting value in pbuf, the resulting size
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in psize, and the resulting type in ptp.
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*/
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long l;
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double d;
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if (*ptp == tp) return 1;
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if (size > *psize) {
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*pbuf = Realloc(*pbuf, (unsigned int) size);
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}
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if ((*ptp)->ty_class == T_SUBRANGE) *ptp = (*ptp)->ty_base;
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switch((*ptp)->ty_class) {
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case T_INTEGER:
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case T_UNSIGNED:
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case T_POINTER:
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case T_ENUM:
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l = get_int(*pbuf, *psize, (*ptp)->ty_class);
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if (tp == bool_type) l = l != 0;
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switch(tp->ty_class) {
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case T_SUBRANGE:
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case T_INTEGER:
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case T_UNSIGNED:
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case T_POINTER:
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case T_ENUM:
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put_int(*pbuf, size, l);
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*psize = size;
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*ptp = tp;
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return 1;
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case T_REAL:
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put_real(*pbuf,
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size,
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(*ptp)->ty_class == T_INTEGER
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? (double) l
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: (double) (unsigned long) l);
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*psize = size;
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*ptp = tp;
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return 1;
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default:
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break;
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}
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break;
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case T_REAL:
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d = get_real(*pbuf, *psize);
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switch(tp->ty_class) {
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case T_ENUM:
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case T_SUBRANGE:
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case T_INTEGER:
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case T_UNSIGNED:
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case T_POINTER:
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if (tp == bool_type) put_int(*pbuf, size, (long) (d != 0));
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else put_int(*pbuf, size, (long) d);
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*psize = size;
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*ptp = tp;
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return 1;
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case T_REAL:
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put_real(*pbuf, size, d);
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*psize = size;
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*ptp = tp;
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return 1;
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default:
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break;
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}
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break;
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default:
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break;
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}
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error("illegal conversion");
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return 0;
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}
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int
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eval_cond(p)
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p_tree p;
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{
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char *buf;
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long size;
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p_type tp;
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long val;
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p_type target_tp = currlang->has_bool_type ? bool_type : int_type;
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if (eval_expr(p, &buf, &size, &tp)) {
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if (convert(&buf, &size, &tp, target_tp, target_tp->ty_size)) {
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val = get_int(buf, size, T_UNSIGNED);
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if (buf) free(buf);
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return (int) (val != 0);
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}
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if (buf) free(buf);
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}
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return 0;
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}
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/* one routine for each unary operator */
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static int
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do_not(p, pbuf, psize, ptp)
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p_tree p;
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char **pbuf;
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long *psize;
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p_type *ptp;
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{
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p_type target_tp = currlang->has_bool_type ? bool_type : int_type;
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if (eval_expr(p->t_args[0], pbuf, psize, ptp) &&
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convert(pbuf, psize, ptp, target_tp, target_tp->ty_size)) {
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put_int(*pbuf, *psize, (long) !get_int(*pbuf, *psize, T_UNSIGNED));
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return 1;
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}
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return 0;
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}
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static int
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do_bnot(p, pbuf, psize, ptp)
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p_tree p;
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char **pbuf;
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long *psize;
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p_type *ptp;
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{
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if (eval_expr(p->t_args[0], pbuf, psize, ptp)) {
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switch((*ptp)->ty_class) {
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case T_INTEGER:
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case T_ENUM:
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case T_UNSIGNED:
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case T_SUBRANGE:
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put_int(*pbuf, *psize, ~get_int(*pbuf, *psize, T_UNSIGNED));
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return 1;
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default:
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error("illegal operand type(s)");
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break;
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}
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}
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return 0;
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}
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static int
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ptr_addr(p, paddr, psize, ptp)
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p_tree p;
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t_addr *paddr;
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long *psize;
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p_type *ptp;
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{
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char *buf;
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if (eval_expr(p->t_args[0], &buf, psize, ptp)) {
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switch((*ptp)->ty_class) {
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case T_POINTER:
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*ptp = (*ptp)->ty_ptrto;
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*psize = (*ptp)->ty_size;
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*paddr = get_int(buf, pointer_size, T_UNSIGNED);
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free(buf);
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return 1;
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default:
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error("illegal operand of DEREF");
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break;
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}
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}
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return 0;
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}
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static int
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do_deref(p, pbuf, psize, ptp)
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p_tree p;
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char **pbuf;
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long *psize;
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p_type *ptp;
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{
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t_addr addr;
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if (ptr_addr(p, &addr, psize, ptp)) {
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*pbuf = Malloc((unsigned) *psize);
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if (! get_bytes(*psize, addr, *pbuf)) {
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error("could not get value");
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}
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return 1;
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}
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return 0;
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}
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static int
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do_addr(p, pbuf, psize, ptp)
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p_tree p;
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char **pbuf;
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long *psize;
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p_type *ptp;
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{
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t_addr addr;
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if (eval_desig(p->t_args[0], &addr, psize, ptp)) {
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*pbuf = Malloc((unsigned) pointer_size);
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put_int(*pbuf, pointer_size, (long) addr);
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return 1;
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}
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return 0;
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}
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static int
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do_unmin(p, pbuf, psize, ptp)
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p_tree p;
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char **pbuf;
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long *psize;
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p_type *ptp;
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{
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if (eval_expr(p->t_args[0], pbuf, psize, ptp)) {
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switch((*ptp)->ty_class) {
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case T_SUBRANGE:
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case T_INTEGER:
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case T_ENUM:
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case T_UNSIGNED:
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put_int(*pbuf, *psize, -get_int(*pbuf, *psize, (*ptp)->ty_class));
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return 1;
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case T_REAL:
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put_real(*pbuf, *psize, -get_real(*pbuf, *psize));
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return 1;
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default:
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error("illegal operand of unary -");
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break;
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}
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}
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return 0;
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}
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static int
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do_unplus(p, pbuf, psize, ptp)
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p_tree p;
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char **pbuf;
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long *psize;
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p_type *ptp;
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{
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if (eval_expr(p->t_args[0], pbuf, psize, ptp)) {
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switch((*ptp)->ty_class) {
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case T_SUBRANGE:
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case T_INTEGER:
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case T_ENUM:
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case T_UNSIGNED:
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case T_REAL:
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return 1;
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default:
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error("illegal operand of unary +");
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break;
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}
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}
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return 0;
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}
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static int (*un_op[])() = {
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0,
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do_not,
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do_deref,
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0,
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0,
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0,
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0,
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0,
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0,
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0,
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0,
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do_unplus,
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do_unmin,
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0,
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0,
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0,
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0,
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0,
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0,
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0,
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0,
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0,
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0,
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0,
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do_bnot,
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0,
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0,
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0,
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do_addr
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};
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static p_type
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balance(tp1, tp2)
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p_type tp1, tp2;
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{
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if (tp1->ty_class == T_SUBRANGE) tp1 = tp1->ty_base;
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if (tp2->ty_class == T_SUBRANGE) tp2 = tp2->ty_base;
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if (tp1 == tp2) return tp2;
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if (tp2->ty_class == T_REAL) {
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p_type tmp = tp1; tp1 = tp2; tp2 = tmp;
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}
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if (tp1->ty_class == T_REAL) {
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switch(tp2->ty_class) {
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case T_INTEGER:
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case T_UNSIGNED:
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case T_ENUM:
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return tp1;
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case T_REAL:
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return tp1->ty_size > tp2->ty_size ? tp1 : tp2;
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default:
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error("illegal type combination");
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return 0;
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}
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}
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if (tp2->ty_class == T_POINTER) {
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p_type tmp = tp1; tp1 = tp2; tp2 = tmp;
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}
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if (tp1->ty_class == T_POINTER) {
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switch(tp2->ty_class) {
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case T_INTEGER:
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case T_UNSIGNED:
|
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case T_POINTER:
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case T_ENUM:
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return tp1;
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default:
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error("illegal type combination");
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return 0;
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}
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}
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if (tp2->ty_class == T_UNSIGNED) {
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p_type tmp = tp1; tp1 = tp2; tp2 = tmp;
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}
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if (tp1->ty_class == T_UNSIGNED) {
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switch(tp2->ty_class) {
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case T_INTEGER:
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case T_UNSIGNED:
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if (tp1->ty_size >= tp2->ty_size) return tp1;
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return tp2;
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case T_ENUM:
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return tp1;
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default:
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error("illegal type combination");
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return 0;
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}
|
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}
|
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if (tp2->ty_class == T_INTEGER) {
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p_type tmp = tp1; tp1 = tp2; tp2 = tmp;
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}
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if (tp1->ty_class == T_INTEGER) {
|
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switch(tp2->ty_class) {
|
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case T_INTEGER:
|
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if (tp1->ty_size >= tp2->ty_size) return tp1;
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return tp2;
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case T_ENUM:
|
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return tp1;
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default:
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error("illegal type combination");
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return 0;
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}
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}
|
|
error("illegal type combination");
|
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return 0;
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|
}
|
|
|
|
static int
|
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do_andor(p, pbuf, psize, ptp)
|
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p_tree p;
|
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char **pbuf;
|
|
long *psize;
|
|
p_type *ptp;
|
|
{
|
|
long l1, l2;
|
|
char *buf;
|
|
long size;
|
|
p_type tp;
|
|
p_type target_tp = currlang->has_bool_type ? bool_type : int_type;
|
|
|
|
if (eval_expr(p->t_args[0], pbuf, psize, ptp) &&
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convert(pbuf, psize, ptp, target_tp, target_tp->ty_size) &&
|
|
eval_expr(p->t_args[1], &buf, &size, &tp) &&
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convert(&buf, &size, &tp, target_tp, target_tp->ty_size)) {
|
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l1 = get_int(*pbuf, *psize, T_UNSIGNED);
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l2 = get_int(buf, size, T_UNSIGNED);
|
|
put_int(*pbuf,
|
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*psize,
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p->t_whichoper == E_AND
|
|
? (long)(l1 && l2)
|
|
: (long)(l1 || l2));
|
|
free(buf);
|
|
return 1;
|
|
}
|
|
free(buf);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
do_arith(p, pbuf, psize, ptp)
|
|
p_tree p;
|
|
char **pbuf;
|
|
long *psize;
|
|
p_type *ptp;
|
|
{
|
|
long l1, l2;
|
|
double d1, d2;
|
|
char *buf = 0;
|
|
long size;
|
|
p_type tp, balance_tp;
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|
|
|
if (eval_expr(p->t_args[0], pbuf, psize, ptp) &&
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eval_expr(p->t_args[1], &buf, &size, &tp) &&
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(balance_tp = balance(*ptp, tp)) &&
|
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convert(pbuf, psize, ptp, balance_tp, balance_tp->ty_size) &&
|
|
convert(&buf, &size, &tp, balance_tp, balance_tp->ty_size)) {
|
|
switch(balance_tp->ty_class) {
|
|
case T_INTEGER:
|
|
case T_ENUM:
|
|
case T_UNSIGNED:
|
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l1 = get_int(*pbuf, *psize, balance_tp->ty_class);
|
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l2 = get_int(buf, size, balance_tp->ty_class);
|
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free(buf);
|
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buf = 0;
|
|
switch(p->t_whichoper) {
|
|
case E_BAND:
|
|
l1 &= l2;
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break;
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case E_BOR:
|
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l1 |= l2;
|
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break;
|
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case E_BXOR:
|
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l1 ^= l2;
|
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break;
|
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case E_PLUS:
|
|
l1 += l2;
|
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break;
|
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case E_MIN:
|
|
l1 -= l2;
|
|
break;
|
|
case E_MUL:
|
|
l1 *= l2;
|
|
break;
|
|
case E_DIV:
|
|
case E_ZDIV:
|
|
if (! l2) {
|
|
error("division by 0");
|
|
return 0;
|
|
}
|
|
if (balance_tp->ty_class == T_INTEGER) {
|
|
if ((l1 < 0) != (l2 < 0)) {
|
|
if (l1 < 0) l1 = - l1;
|
|
else l2 = -l2;
|
|
if (p->t_whichoper == E_DIV) {
|
|
l1 = -((l1+l2-1)/l2);
|
|
}
|
|
else {
|
|
l1 = -(l1/l2);
|
|
}
|
|
}
|
|
else l1 /= l2;
|
|
}
|
|
else l1 = (unsigned long) l1 /
|
|
(unsigned long) l2;
|
|
break;
|
|
case E_MOD:
|
|
case E_ZMOD:
|
|
if (! l2) {
|
|
error("modulo by 0");
|
|
return 0;
|
|
}
|
|
if (balance_tp->ty_class == T_INTEGER) {
|
|
if ((l1 < 0) != (l2 < 0)) {
|
|
if (l1 < 0) l1 = - l1;
|
|
else l2 = -l2;
|
|
if (p->t_whichoper == E_MOD) {
|
|
l1 = ((l1+l2-1)/l2)*l2 - l1;
|
|
}
|
|
else {
|
|
l1 = (l1/l2)*l2 - l1;
|
|
}
|
|
}
|
|
else l1 %= l2;
|
|
}
|
|
else l1 = (unsigned long) l1 %
|
|
(unsigned long) l2;
|
|
break;
|
|
}
|
|
put_int(*pbuf, *psize, l1);
|
|
break;
|
|
case T_REAL:
|
|
d1 = get_real(*pbuf, *psize);
|
|
d2 = get_real(buf, size);
|
|
free(buf);
|
|
buf = 0;
|
|
switch(p->t_whichoper) {
|
|
case E_DIV:
|
|
case E_ZDIV:
|
|
if (d2 == 0.0) {
|
|
error("division by 0.0");
|
|
return 0;
|
|
}
|
|
d1 /= d2;
|
|
break;
|
|
case E_PLUS:
|
|
d1 += d2;
|
|
break;
|
|
case E_MIN:
|
|
d1 -= d2;
|
|
break;
|
|
case E_MUL:
|
|
d1 *= d2;
|
|
break;
|
|
}
|
|
put_real(*pbuf, *psize, d1);
|
|
break;
|
|
default:
|
|
error("illegal operand type(s)");
|
|
free(buf);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
if (buf) free(buf);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
do_sft(p, pbuf, psize, ptp)
|
|
p_tree p;
|
|
char **pbuf;
|
|
long *psize;
|
|
p_type *ptp;
|
|
{
|
|
long l1, l2;
|
|
char *buf = 0;
|
|
long size;
|
|
p_type tp;
|
|
|
|
if (eval_expr(p->t_args[0], pbuf, psize, ptp) &&
|
|
eval_expr(p->t_args[1], &buf, &size, &tp) &&
|
|
convert(&buf, &size, &tp, int_type, int_size)) {
|
|
tp = *ptp;
|
|
if (tp->ty_class == T_SUBRANGE) {
|
|
tp = tp->ty_base;
|
|
}
|
|
switch(tp->ty_class) {
|
|
case T_INTEGER:
|
|
case T_ENUM:
|
|
case T_UNSIGNED:
|
|
l1 = get_int(*pbuf, *psize, tp->ty_class);
|
|
l2 = get_int(buf, size, T_INTEGER);
|
|
free(buf);
|
|
buf = 0;
|
|
switch(p->t_whichoper) {
|
|
case E_LSFT:
|
|
l1 <<= (int) l2;
|
|
break;
|
|
case E_RSFT:
|
|
if (tp->ty_class == T_INTEGER) l1 >>= (int) l2;
|
|
else l1 = (unsigned long) l1 >> (int) l2;
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
error("illegal operand type(s)");
|
|
free(buf);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
if (buf) free(buf);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
do_cmp(p, pbuf, psize, ptp)
|
|
p_tree p;
|
|
char **pbuf;
|
|
long *psize;
|
|
p_type *ptp;
|
|
{
|
|
long l1, l2;
|
|
double d1, d2;
|
|
char *buf = 0;
|
|
long size;
|
|
p_type tp, balance_tp;
|
|
|
|
if (eval_expr(p->t_args[0], pbuf, psize, ptp) &&
|
|
eval_expr(p->t_args[1], &buf, &size, &tp) &&
|
|
(balance_tp = balance(*ptp, tp)) &&
|
|
convert(pbuf, psize, ptp, balance_tp, balance_tp->ty_size) &&
|
|
convert(&buf, &size, &tp, balance_tp, balance_tp->ty_size)) {
|
|
switch(balance_tp->ty_class) {
|
|
case T_INTEGER:
|
|
case T_ENUM:
|
|
case T_UNSIGNED:
|
|
case T_POINTER:
|
|
l1 = get_int(*pbuf, *psize, balance_tp->ty_class);
|
|
l2 = get_int(buf, size, balance_tp->ty_class);
|
|
free(buf);
|
|
buf = 0;
|
|
switch(p->t_whichoper) {
|
|
case E_EQUAL:
|
|
l1 = l1 == l2;
|
|
break;
|
|
case E_NOTEQUAL:
|
|
l1 = l1 != l2;
|
|
break;
|
|
case E_LTEQUAL:
|
|
if (balance_tp->ty_class == T_INTEGER) {
|
|
l1 = l1 <= l2;
|
|
}
|
|
else l1 = (unsigned long) l1 <=
|
|
(unsigned long) l2;
|
|
break;
|
|
case E_LT:
|
|
if (balance_tp->ty_class == T_INTEGER) {
|
|
l1 = l1 < l2;
|
|
}
|
|
else l1 = (unsigned long) l1 <
|
|
(unsigned long) l2;
|
|
break;
|
|
case E_GTEQUAL:
|
|
if (balance_tp->ty_class == T_INTEGER) {
|
|
l1 = l1 >= l2;
|
|
}
|
|
else l1 = (unsigned long) l1 >=
|
|
(unsigned long) l2;
|
|
break;
|
|
case E_GT:
|
|
if (balance_tp->ty_class == T_INTEGER) {
|
|
l1 = l1 > l2;
|
|
}
|
|
else l1 = (unsigned long) l1 >
|
|
(unsigned long) l2;
|
|
break;
|
|
}
|
|
break;
|
|
case T_REAL:
|
|
d1 = get_real(*pbuf, *psize);
|
|
d2 = get_real(buf, size);
|
|
free(buf);
|
|
buf = 0;
|
|
switch(p->t_whichoper) {
|
|
case E_EQUAL:
|
|
l1 = d1 == d2;
|
|
break;
|
|
case E_NOTEQUAL:
|
|
l1 = d1 != d2;
|
|
break;
|
|
case E_LTEQUAL:
|
|
l1 = d1 <= d2;
|
|
break;
|
|
case E_LT:
|
|
l1 = d1 < d2;
|
|
break;
|
|
case E_GTEQUAL:
|
|
l1 = d1 >= d2;
|
|
break;
|
|
case E_GT:
|
|
l1 = d1 > d2;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
if (*psize < int_size) {
|
|
*psize = int_size;
|
|
free(*pbuf);
|
|
*pbuf = Malloc((unsigned int) int_size);
|
|
}
|
|
else *psize = int_size;
|
|
if (currlang->has_bool_type) {
|
|
*ptp = bool_type;
|
|
}
|
|
else *ptp = int_type;
|
|
put_int(*pbuf, *psize, l1);
|
|
return 1;
|
|
}
|
|
if (buf) free(buf);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
do_in(p, pbuf, psize, ptp)
|
|
p_tree p;
|
|
char **pbuf;
|
|
long *psize;
|
|
p_type *ptp;
|
|
{
|
|
long l;
|
|
char *buf = 0;
|
|
long size;
|
|
p_type tp;
|
|
int sft = int_size == 2 ? 4 : 5;
|
|
|
|
if (eval_expr(p->t_args[0], pbuf, psize, ptp) &&
|
|
eval_expr(p->t_args[1], &buf, &size, &tp)) {
|
|
if (tp->ty_class != T_SET) {
|
|
error("right-hand side of IN not a set");
|
|
free(buf);
|
|
return 0;
|
|
}
|
|
if (! convert(pbuf, psize, ptp, tp->ty_setbase, int_size)) {
|
|
free(buf);
|
|
return 0;
|
|
}
|
|
l = get_int(*pbuf, *psize, (*ptp)->ty_class) - tp->ty_setlow;
|
|
l = l >= 0
|
|
&& l <= (size << 3)
|
|
&& (((int *) buf)[(int)(l>>sft)] & (1 << (l & ((1 << sft)-1))));
|
|
free(buf);
|
|
*pbuf = Realloc(*pbuf, (unsigned) int_size);
|
|
*psize = int_size;
|
|
*ptp = currlang->has_bool_type ? bool_type : int_type;
|
|
put_int(*pbuf, *psize, l);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
array_addr(p, paddr, psize, ptp)
|
|
p_tree p;
|
|
t_addr *paddr;
|
|
long *psize;
|
|
p_type *ptp;
|
|
{
|
|
long l;
|
|
char *buf = 0;
|
|
long size;
|
|
p_type tp;
|
|
|
|
if (eval_desig(p->t_args[0], paddr, psize, ptp) &&
|
|
eval_expr(p->t_args[1], &buf, &size, &tp)) {
|
|
if ((*ptp)->ty_class != T_ARRAY && (*ptp)->ty_class != T_POINTER) {
|
|
error("illegal left-hand side of [");
|
|
free(buf);
|
|
return 0;
|
|
}
|
|
if (! convert(&buf, &size, &tp, int_type, int_size)) {
|
|
free(buf);
|
|
return 0;
|
|
}
|
|
l = get_int(buf, size, T_INTEGER);
|
|
free(buf);
|
|
buf = 0;
|
|
if ((*ptp)->ty_class == T_ARRAY) {
|
|
if (l < (*ptp)->ty_lb || l > (*ptp)->ty_hb) {
|
|
error("array bound error");
|
|
return 0;
|
|
}
|
|
l -= (*ptp)->ty_lb;
|
|
*ptp = (*ptp)->ty_elements;
|
|
l *= (*currlang->arrayelsize)((*ptp)->ty_size);
|
|
}
|
|
else {
|
|
*ptp = (*ptp)->ty_ptrto;
|
|
l *= (*ptp)->ty_size;
|
|
}
|
|
*psize = (*ptp)->ty_size;
|
|
*paddr += l;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
do_array(p, pbuf, psize, ptp)
|
|
p_tree p;
|
|
char **pbuf;
|
|
long *psize;
|
|
p_type *ptp;
|
|
{
|
|
t_addr a;
|
|
|
|
if (array_addr(p, &a, psize, ptp)) {
|
|
*pbuf = Malloc((unsigned int) *psize);
|
|
if (! get_bytes(*psize, a, *pbuf)) {
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
select_addr(p, paddr, psize, ptp)
|
|
p_tree p;
|
|
t_addr *paddr;
|
|
long *psize;
|
|
p_type *ptp;
|
|
{
|
|
register p_type tp;
|
|
register struct fields *f;
|
|
register int nf;
|
|
|
|
if (eval_desig(p->t_args[0], paddr, psize, ptp)) {
|
|
tp = *ptp;
|
|
if (tp->ty_class != T_STRUCT && tp->ty_class != T_UNION) {
|
|
error("SELECT on non-struct");
|
|
return 0;
|
|
}
|
|
if (p->t_args[1]->t_oper != OP_NAME) {
|
|
error("right-hand side of SELECT not a name");
|
|
return 0;
|
|
}
|
|
for (nf = tp->ty_nfields, f = tp->ty_fields; nf; nf--, f++) {
|
|
if (! strcmp(f->fld_name, p->t_args[1]->t_str)) break;
|
|
}
|
|
if (! nf) {
|
|
error("'%s' not found", p->t_args[1]->t_str);
|
|
return 0;
|
|
}
|
|
|
|
/* ??? this needs some work for bitfields ??? */
|
|
*paddr += f->fld_pos>>3;
|
|
*psize = f->fld_bitsize >> 3;
|
|
*ptp = f->fld_type;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
do_select(p, pbuf, psize, ptp)
|
|
p_tree p;
|
|
char **pbuf;
|
|
long *psize;
|
|
p_type *ptp;
|
|
{
|
|
t_addr a;
|
|
if (select_addr(p, &a, psize, ptp)) {
|
|
*pbuf = Malloc((unsigned int) *psize);
|
|
if (! get_bytes(*psize, a, *pbuf)) {
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int (*bin_op[])() = {
|
|
0,
|
|
0,
|
|
0,
|
|
do_andor,
|
|
do_andor,
|
|
do_arith,
|
|
do_arith,
|
|
do_arith,
|
|
do_arith,
|
|
do_in,
|
|
do_array,
|
|
do_arith,
|
|
do_arith,
|
|
do_arith,
|
|
do_cmp,
|
|
do_cmp,
|
|
do_cmp,
|
|
do_cmp,
|
|
do_cmp,
|
|
do_cmp,
|
|
do_select,
|
|
do_arith,
|
|
do_arith,
|
|
do_arith,
|
|
0,
|
|
0,
|
|
do_sft,
|
|
do_sft,
|
|
0
|
|
};
|
|
|
|
int
|
|
eval_expr(p, pbuf, psize, ptp)
|
|
p_tree p;
|
|
char **pbuf;
|
|
long *psize;
|
|
p_type *ptp;
|
|
{
|
|
register p_symbol sym;
|
|
int retval = 0;
|
|
|
|
switch(p->t_oper) {
|
|
case OP_NAME:
|
|
case OP_SELECT:
|
|
sym = identify(p, VAR|REGVAR|LOCVAR|VARPAR|CONST);
|
|
if (! sym) return 0;
|
|
if (! get_value(sym, pbuf, psize)) {
|
|
print_node(p, 0);
|
|
fputs(" currently not available\n", db_out);
|
|
break;
|
|
}
|
|
*ptp = sym->sy_type;
|
|
retval = 1;
|
|
break;
|
|
|
|
case OP_INTEGER:
|
|
*pbuf = Malloc(sizeof(long));
|
|
*psize = sizeof(long);
|
|
*ptp = long_type;
|
|
*((long *) (*pbuf)) = p->t_ival;
|
|
retval = 1;
|
|
break;
|
|
|
|
case OP_REAL:
|
|
*pbuf = Malloc(sizeof(double));
|
|
*psize = sizeof(double);
|
|
*ptp = double_type;
|
|
*((double *) (*pbuf)) = p->t_fval;
|
|
retval = 1;
|
|
break;
|
|
|
|
case OP_STRING:
|
|
*pbuf = Malloc(sizeof(char *));
|
|
*psize = sizeof(char *);
|
|
*ptp = string_type;
|
|
*((char **) (*pbuf)) = p->t_sval;
|
|
retval = 1;
|
|
break;
|
|
|
|
case OP_UNOP:
|
|
retval = (*un_op[p->t_whichoper])(p, pbuf, psize, ptp);
|
|
break;
|
|
|
|
case OP_BINOP:
|
|
retval = (*bin_op[p->t_whichoper])(p, pbuf, psize, ptp);
|
|
break;
|
|
default:
|
|
assert(0);
|
|
break;
|
|
}
|
|
if (! retval) {
|
|
if (*pbuf) {
|
|
free(*pbuf);
|
|
*pbuf = 0;
|
|
}
|
|
*psize = 0;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
extern t_addr get_addr();
|
|
|
|
int
|
|
eval_desig(p, paddr, psize, ptp)
|
|
p_tree p;
|
|
t_addr *paddr;
|
|
long *psize;
|
|
p_type *ptp;
|
|
{
|
|
register p_symbol sym;
|
|
int retval = 0;
|
|
t_addr a;
|
|
|
|
switch(p->t_oper) {
|
|
case OP_NAME:
|
|
case OP_SELECT:
|
|
sym = identify(p, VAR|REGVAR|LOCVAR|VARPAR);
|
|
if (! sym) return 0;
|
|
if (! (a = get_addr(sym, psize))) {
|
|
print_node(p, 0);
|
|
fputs(" currently not available\n", db_out);
|
|
break;
|
|
}
|
|
*paddr = a;
|
|
*ptp = sym->sy_type;
|
|
retval = 1;
|
|
break;
|
|
|
|
case OP_UNOP:
|
|
switch(p->t_whichoper) {
|
|
case E_DEREF:
|
|
if (ptr_addr(p, paddr, psize, ptp)) {
|
|
retval = 1;
|
|
}
|
|
break;
|
|
default:
|
|
print_node(p, 0);
|
|
fputs(" not a designator\n", db_out);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case OP_BINOP:
|
|
switch(p->t_whichoper) {
|
|
case E_ARRAY:
|
|
if (array_addr(p, paddr, psize, ptp)) {
|
|
retval = 1;
|
|
}
|
|
break;
|
|
case E_SELECT:
|
|
if (select_addr(p, paddr, psize, ptp)) {
|
|
retval = 1;
|
|
}
|
|
break;
|
|
default:
|
|
print_node(p, 0);
|
|
fputs(" not a designator\n", db_out);
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
assert(0);
|
|
break;
|
|
}
|
|
if (! retval) {
|
|
*psize = 0;
|
|
}
|
|
return retval;
|
|
}
|