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eoperators.c
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eoperators.c
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/*
eoperators.c: this file contains all of the operators called from
inside eval_instruction() in interpret.c.
*/
#define SUPPRESS_COMPILER_INLINES
#include "std.h"
#include "lpc_incl.h"
#include "efuns_incl.h"
#include "backend.h"
#include "parse.h"
#include "swap.h"
#ifdef TRACE
#include "comm.h"
#endif
#include "compiler.h"
#include "simul_efun.h"
#include "eoperators.h"
INLINE void f_and()
{
if (sp->type == T_ARRAY && (sp - 1)->type == T_ARRAY) {
sp--;
sp->u.arr = intersect_array((sp + 1)->u.arr, sp->u.arr);
return;
}
CHECK_TYPES(sp - 1, T_NUMBER, 1, F_AND);
CHECK_TYPES(sp, T_NUMBER, 2, F_AND);
sp--;
sp->u.number &= (sp + 1)->u.number;
sp->subtype = 0;
}
INLINE void
f_and_eq()
{
svalue_t *argp;
argp = (sp--)->u.lvalue;
if (argp->type == T_ARRAY && sp->type == T_ARRAY) {
sp->u.arr = argp->u.arr = intersect_array(argp->u.arr, sp->u.arr);
sp->u.arr->ref++; /* since we put it in two places */
return;
}
if (argp->type != T_NUMBER)
error("Bad left type to &=\n");
if (sp->type != T_NUMBER)
error("Bad right type to &=\n");
sp->u.number = argp->u.number &= sp->u.number;
sp->subtype = 0;
}
INLINE void
f_div_eq()
{
svalue_t *argp = (sp--)->u.lvalue;
switch (argp->type | sp->type) {
case T_NUMBER:
{
if (!sp->u.number) error("Division by 0nn\n");
sp->u.number = argp->u.number /= sp->u.number;
sp->subtype = 0;
break;
}
case T_REAL:
{
if (sp->u.real == 0.0) error("Division by 0rr\n");
sp->u.real = argp->u.real /= sp->u.real;
break;
}
case T_NUMBER|T_REAL:
{
if (sp->type == T_NUMBER) {
if (!sp->u.number) error("Division by 0rn\n");
sp->u.real = argp->u.real /= sp->u.number;
sp->type = T_REAL;
} else {
if (sp->u.real == 0.0) error("Division by 0nr\n");
sp->u.real = argp->u.number /= sp->u.real;
}
break;
}
default:
{
if (!(sp->type & (T_NUMBER|T_REAL))) error("Bad right type to /=\n");
else error("Bad left type to /=\n");
}
}
}
INLINE void
f_eq()
{
int i;
switch (sp->type|(sp-1)->type) {
case T_NUMBER:
{
--sp;
sp->u.number = sp->u.number == (sp+1)->u.number;
sp->subtype = 0;
return;
}
case T_REAL:
{
--sp;
sp->type = T_NUMBER;
sp->u.number = sp->u.real == (sp+1)->u.real;
sp->subtype = 0;
return;
}
case T_NUMBER|T_REAL:
{
if ((--sp)->type == T_NUMBER) {
sp->u.number = sp->u.number == (sp+1)->u.real;
}
else {
sp->u.number = sp->u.real == (sp+1)->u.number;
sp->type = T_NUMBER;
}
sp->subtype = 0;
return;
}
case T_ARRAY:
{
i = (sp-1)->u.arr == sp->u.arr;
free_array((sp--)->u.arr);
free_array(sp->u.arr);
break;
}
case T_CLASS:
{
i = (sp-1)->u.arr == sp->u.arr;
free_class((sp--)->u.arr);
free_class(sp->u.arr);
break;
}
case T_MAPPING:
{
i = (sp-1)->u.map == sp->u.map;
free_mapping((sp--)->u.map);
free_mapping(sp->u.map);
break;
}
case T_STRING:
{
if (SVALUE_STRLEN_DIFFERS(sp-1,sp))
i = 0;
else
i = !strcmp((sp-1)->u.string, sp->u.string);
free_string_svalue(sp--);
free_string_svalue(sp);
break;
}
case T_OBJECT:
{
i = (sp-1)->u.ob == sp->u.ob;
free_object((sp--)->u.ob, "f_eq: 1");
free_object(sp->u.ob, "f_eq: 2");
break;
}
case T_FUNCTION:
{
i = (sp-1)->u.fp == sp->u.fp;
free_funp((sp--)->u.fp);
free_funp(sp->u.fp);
break;
}
#ifndef NO_BUFFER_TYPE
case T_BUFFER:
{
i = (sp-1)->u.buf == sp->u.buf;
free_buffer((sp--)->u.buf);
free_buffer(sp->u.buf);
break;
}
#endif
default:
pop_stack();
free_svalue(sp, "f_eq");
i = 0;
}
/* args are freed, stack pointer points to spot for return value */
put_number(i);
}
INLINE void
f_ge()
{
int i = sp->type;
switch ((--sp)->type | i) {
case T_NUMBER:
sp->u.number = sp->u.number >= (sp+1)->u.number;
sp->subtype = 0;
break;
case T_REAL:
i = sp->u.real >= (sp+1)->u.real;
put_number(i);
break;
case T_NUMBER | T_REAL:
if (i == T_NUMBER) {
sp->type = T_NUMBER;
sp->u.number = sp->u.real >= (sp+1)->u.number;
} else {
sp->u.number = sp->u.number >= (sp+1)->u.real;
}
sp->subtype = 0;
break;
case T_STRING:
i = strcmp(sp->u.string, (sp+1)->u.string) >= 0;
free_string_svalue(sp + 1);
free_string_svalue(sp);
put_number(i);
break;
default:
{
switch ((sp++)->type) {
case T_NUMBER:
case T_REAL:
bad_argument(sp, T_NUMBER | T_REAL, 2, F_GE);
case T_STRING:
bad_argument(sp, T_STRING, 2, F_GE);
default:
bad_argument(sp - 1, T_NUMBER | T_STRING | T_REAL, 1, F_GE);
}
}
}
}
INLINE void
f_gt() {
int i = sp->type;
switch ((--sp)->type | i) {
case T_NUMBER:
sp->u.number = sp->u.number > (sp+1)->u.number;
sp->subtype = 0;
break;
case T_REAL:
sp->u.number = sp->u.real > (sp+1)->u.real;
sp->type = T_NUMBER;
sp->subtype = 0;
break;
case T_NUMBER | T_REAL:
if (i == T_NUMBER) {
sp->type = T_NUMBER;
sp->u.number = sp->u.real > (sp+1)->u.number;
} else sp->u.number = sp->u.number > (sp+1)->u.real;
sp->subtype = 0;
break;
case T_STRING:
i = strcmp(sp->u.string, (sp+1)->u.string) > 0;
free_string_svalue(sp+1);
free_string_svalue(sp);
put_number(i);
break;
default:
{
switch ((sp++)->type) {
case T_NUMBER:
case T_REAL:
bad_argument(sp, T_NUMBER | T_REAL, 2, F_GT);
case T_STRING:
bad_argument(sp, T_STRING, 2, F_GT);
default:
bad_argument(sp-1, T_NUMBER | T_REAL | T_STRING, 1, F_GT);
}
}
}
}
INLINE void
f_le()
{
int i = sp->type;
switch((--sp)->type|i) {
case T_NUMBER:
sp->u.number = sp->u.number <= (sp+1)->u.number;
break;
case T_REAL:
sp->u.number = sp->u.real <= (sp+1)->u.real;
sp->type = T_NUMBER;
break;
case T_NUMBER|T_REAL:
if (i == T_NUMBER) {
sp->type = T_NUMBER;
sp->u.number = sp->u.real <= (sp+1)->u.number;
} else sp->u.number = sp->u.number <= (sp+1)->u.real;
break;
case T_STRING:
i = strcmp(sp->u.string, (sp+1)->u.string) <= 0;
free_string_svalue(sp+1);
free_string_svalue(sp);
sp->type = T_NUMBER;
sp->u.number = i;
break;
default:
{
switch((sp++)->type) {
case T_NUMBER:
case T_REAL:
bad_argument(sp, T_NUMBER | T_REAL, 2, F_LE);
case T_STRING:
bad_argument(sp, T_STRING, 2, F_LE);
default:
bad_argument(sp - 1, T_NUMBER | T_STRING | T_REAL, 1, F_LE);
}
}
}
sp->subtype = 0;
}
INLINE void
f_lt() {
int i = sp->type;
switch (i | (--sp)->type) {
case T_NUMBER:
sp->u.number = sp->u.number < (sp+1)->u.number;
break;
case T_REAL:
sp->u.number = sp->u.real < (sp+1)->u.real;
sp->type = T_NUMBER;
break;
case T_NUMBER|T_REAL:
if (i == T_NUMBER) {
sp->type = T_NUMBER;
sp->u.number = sp->u.real < (sp+1)->u.number;
} else sp->u.number = sp->u.number < (sp+1)->u.real;
break;
case T_STRING:
i = (strcmp(sp->u.string, (sp + 1)->u.string) < 0);
free_string_svalue(sp+1);
free_string_svalue(sp);
sp->type = T_NUMBER;
sp->u.number = i;
break;
default:
switch ((sp++)->type) {
case T_NUMBER:
case T_REAL:
bad_argument(sp, T_NUMBER | T_REAL, 2, F_LT);
case T_STRING:
bad_argument(sp, T_STRING, 2, F_LT);
default:
bad_argument(sp-1, T_NUMBER | T_STRING | T_REAL, 1, F_LT);
}
}
sp->subtype = 0;
}
INLINE void
f_lsh()
{
CHECK_TYPES((sp - 1), T_NUMBER, 1, F_LSH);
CHECK_TYPES(sp, T_NUMBER, 2, F_LSH);
sp--;
sp->u.number <<= (sp + 1)->u.number;
}
INLINE void
f_lsh_eq()
{
svalue_t *argp;
if ((argp = sp->u.lvalue)->type != T_NUMBER)
error("Bad left type to <<=\n");
if ((--sp)->type != T_NUMBER)
error("Bad right type to <<=\n");
sp->u.number = argp->u.number <<= sp->u.number;
sp->subtype = 0;
}
INLINE void
f_mod_eq()
{
svalue_t *argp;
if ((argp = sp->u.lvalue)->type != T_NUMBER)
error("Bad left type to %=\n");
if ((--sp)->type != T_NUMBER)
error("Bad right type to %=\n");
if (sp->u.number == 0)
error("Modulo by 0\n");
sp->u.number = argp->u.number %= sp->u.number;
sp->subtype = 0;
}
INLINE void
f_mult_eq()
{
svalue_t *argp = (sp--)->u.lvalue;
switch(argp->type | sp->type) {
case T_NUMBER:
{
sp->u.number = argp->u.number *= sp->u.number;
sp->subtype = 0;
break;
}
case T_REAL:
{
sp->u.real = argp->u.real *= sp->u.real;
break;
}
case T_NUMBER|T_REAL:
{
if (sp->type == T_NUMBER) {
sp->type = T_REAL;
sp->u.real = argp->u.real *= sp->u.number;
}
else {
sp->u.real = argp->u.number *= sp->u.real;
}
break;
}
case T_MAPPING:
{
mapping_t *m = compose_mapping(argp->u.map, sp->u.map,0);
if (argp->u.map != sp->u.map) {
pop_stack();
push_mapping(m);
}
break;
}
default:
{
if (!(sp->type & (T_NUMBER|T_REAL|T_MAPPING))) error("Bad right type to *=\n");
else error("Bad left type to *=\n");
}
}
}
INLINE void
f_ne()
{
int i;
switch (sp->type|(sp-1)->type) {
case T_NUMBER:
{
--sp;
sp->u.number = sp->u.number != (sp+1)->u.number;
sp->subtype = 0;
return;
}
case T_REAL:
{
--sp;
sp->type = T_NUMBER;
sp->u.number = sp->u.real != (sp+1)->u.real;
sp->subtype = 0;
return;
}
case T_NUMBER|T_REAL:
{
if ((--sp)->type == T_NUMBER) {
sp->u.number = sp->u.number != (sp+1)->u.real;
}
else {
sp->u.number = sp->u.real != (sp+1)->u.number;
sp->type = T_NUMBER;
}
sp->subtype = 0;
return;
}
case T_ARRAY:
{
i = (sp-1)->u.arr != sp->u.arr;
free_array((sp--)->u.arr);
free_array(sp->u.arr);
break;
}
case T_CLASS:
{
i = (sp-1)->u.arr != sp->u.arr;
free_class((sp--)->u.arr);
free_class(sp->u.arr);
break;
}
case T_MAPPING:
{
i = (sp-1)->u.map != sp->u.map;
free_mapping((sp--)->u.map);
free_mapping(sp->u.map);
break;
}
case T_STRING:
{
if (SVALUE_STRLEN_DIFFERS(sp-1, sp))
i = 1;
else
i = !!strcmp((sp-1)->u.string, sp->u.string);
free_string_svalue(sp--);
free_string_svalue(sp);
break;
}
case T_OBJECT:
{
i = (sp-1)->u.ob != sp->u.ob;
free_object((sp--)->u.ob, "f_ne: 1");
free_object(sp->u.ob, "f_ne: 2");
break;
}
case T_FUNCTION:
{
i = (sp-1)->u.fp != sp->u.fp;
free_funp((sp--)->u.fp);
free_funp(sp->u.fp);
break;
}
#ifndef NO_BUFFER_TYPE
case T_BUFFER:
{
i = (sp-1)->u.buf != sp->u.buf;
free_buffer((sp--)->u.buf);
free_buffer(sp->u.buf);
break;
}
#endif
default:
pop_stack();
free_svalue(sp, "f_ne");
i = 1;
}
sp->type = T_NUMBER;
sp->subtype = 0;
sp->u.number = i;
}
INLINE void
f_or()
{
if (sp->type == T_ARRAY && (sp - 1)->type == T_ARRAY) {
sp--;
sp->u.arr = union_array(sp->u.arr, (sp+1)->u.arr);
return;
}
CHECK_TYPES((sp - 1), T_NUMBER, 1, F_OR);
CHECK_TYPES(sp, T_NUMBER, 2, F_OR);
sp--;
sp->u.number |= (sp + 1)->u.number;
}
INLINE void
f_or_eq()
{
svalue_t *argp;
argp = (sp--)->u.lvalue;
if (argp->type == T_ARRAY && sp->type == T_ARRAY) {
argp->u.arr = sp->u.arr = union_array(argp->u.arr, sp->u.arr);
sp->u.arr->ref++; /* because we put it in two places */
return;
}
if (argp->type != T_NUMBER)
error("Bad left type to |=\n");
if (sp->type != T_NUMBER)
error("Bad right type to |=\n");
sp->u.number = argp->u.number |= sp->u.number;
sp->subtype = 0;
}
INLINE void
f_parse_command()
{
svalue_t *arg;
svalue_t *fp;
int i;
int num_arg;
/*
* get number of lvalue args
*/
num_arg = EXTRACT_UCHAR(pc);
pc++;
/*
* type checking on first three required parameters to parse_command()
*/
arg = sp - 2;
CHECK_TYPES(&arg[0], T_STRING, 1, F_PARSE_COMMAND);
CHECK_TYPES(&arg[1], T_OBJECT | T_ARRAY, 2, F_PARSE_COMMAND);
CHECK_TYPES(&arg[2], T_STRING, 3, F_PARSE_COMMAND);
/*
* allocate stack frame for rvalues and return value (number of matches);
* perform some stack manipulation;
*/
fp = sp;
CHECK_STACK_OVERFLOW(num_arg + 1);
sp += num_arg + 1;
arg = sp;
*(arg--) = *(fp--); /* move pattern to top of stack */
*(arg--) = *(fp--); /* move source object or array to just below
the pattern */
*(arg) = *(fp); /* move source string just below the object */
fp->type = T_NUMBER;
/*
* prep area for rvalues
*/
for (i = 1; i <= num_arg; i++)
fp[i].type = T_INVALID;
/*
* do it...
*/
i = parse(arg[0].u.string, &arg[1], arg[2].u.string, &fp[1], num_arg);
/*
* remove mandatory parameters
*/
pop_3_elems();
/*
* save return value on stack
*/
fp->u.number = i;
fp->subtype = 0;
}
INLINE void
f_range(int code)
{
int from, to, len;
if ((sp-2)->type != T_NUMBER)
error("Start of range [ .. ] interval must be a number.\n");
if ((sp-1)->type != T_NUMBER)
error("End of range [ .. ] interval must be a number.\n");
switch(sp->type) {
case T_STRING:
{
char *res = sp->u.string;
len = SVALUE_STRLEN(sp);
to = (--sp)->u.number;
if (code & 0x01) to = len - to;
#ifdef OLD_RANGE_BEHAVIOR
else if (to < 0)
to += len;
#endif
from = (--sp)->u.number;
if (code & 0x10) from = len - from;
#ifdef OLD_RANGE_BEHAVIOR
else if (from < 0)
from += len;
#endif
if (from < 0) from = 0;
if (to < from || from >= len) {
free_string_svalue(sp+2);
sp->type = T_STRING;
sp->subtype = STRING_CONSTANT;
sp->u.string = "";
return;
}
if (to >= len - 1) {
put_malloced_string(string_copy(res + from, "f_range"));
} else {
char *tmp;
tmp = new_string(to - from + 1, "f_range");
strncpy(tmp, res + from, to - from + 1);
tmp[to - from + 1] = '\0';
put_malloced_string(tmp);
}
free_string_svalue(sp + 2);
break;
}
#ifndef NO_BUFFER_TYPE
case T_BUFFER:
{
buffer_t *rbuf = sp->u.buf;
len = rbuf->size;
to = (--sp)->u.number;
if (code & 0x01) to = len - to;
#ifdef OLD_RANGE_BEHAVIOR
if (to < 0) to += len;
#endif
from = (--sp)->u.number;
if (code & 0x10) from = len - from;
#ifdef OLD_RANGE_BEHAVIOR
if (from < 0) {
if ((from += len) < 0) from = 0;
}
#else
if (from < 0) from = 0;
#endif
if (to < from || from >= len) {
free_buffer(rbuf);
put_buffer(null_buffer());
return;
}
if (to >= len) to = len - 1;
{
buffer_t *nbuf = allocate_buffer(to - from + 1);
memcpy(nbuf->item, rbuf->item + from, to - from + 1);
free_buffer(rbuf);
put_buffer(nbuf);
}
break;
}
#endif
case T_ARRAY:
{
array_t *v = sp->u.arr;
to = (--sp)->u.number;
if (code & 0x01) to = v->size - to;
from = (--sp)->u.number;
if (code & 0x10) from = v->size - from;
put_array(slice_array(v, from, to));
break;
}
default:
error("Cannot index type '%s' using [ .. ] operator.\n",
type_name(sp->type));
}
}
INLINE void
f_extract_range(int code)
{
int from, len;
if ((sp-1)->type != T_NUMBER)
error("Start of range [ .. ] interval must be a number.\n");
switch(sp->type) {
case T_STRING:
{
char *res = sp->u.string;
len = SVALUE_STRLEN(sp);
from = (--sp)->u.number;
if (code) from = len - from;
#ifdef OLD_RANGE_BEHAVIOR
if (from < 0) {
if ((from += len) < 0) from = 0;
}
#else
if (from < 0) from = 0;
#endif
if (from >= len) {
sp->type = T_STRING;
sp->subtype = STRING_CONSTANT;
sp->u.string = "";
} else
put_malloced_string(string_copy(res + from, "f_extract_range"));
free_string_svalue(sp + 1);
break;
}
#ifndef NO_BUFFER_TYPE
case T_BUFFER:
{
buffer_t *rbuf = sp->u.buf;
buffer_t *nbuf;
len = rbuf->size;
from = (--sp)->u.number;
if (code) from = len - from;
#ifdef OLD_RANGE_BEHAVIOR
if (from < 0) {
if ((from += len) < 0) from = 0;
}
#else
if (from < 0) from = 0;
#endif
if (from > len) from = len;
nbuf = allocate_buffer(len - from);
memcpy(nbuf->item, rbuf->item + from, len - from);
free_buffer(rbuf);
put_buffer(nbuf);
break;
}
#endif
case T_ARRAY:
{
array_t *v = sp->u.arr;
from = (--sp)->u.number;
if (code) from = v->size - from;
put_array(slice_array(v, from, v->size - 1));
break;
}
default:
error("Bad argument to [ .. ] range operator.\n");
}
}
INLINE void
f_rsh()
{
CHECK_TYPES((sp - 1), T_NUMBER, 1, F_RSH);
CHECK_TYPES(sp, T_NUMBER, 2, F_RSH);
sp--;
sp->u.number >>= (sp + 1)->u.number;
}
INLINE void
f_rsh_eq()
{
svalue_t *argp;
if ((argp = sp->u.lvalue)->type != T_NUMBER)
error("Bad left type to >>=\n");
if ((--sp)->type != T_NUMBER)
error("Bad right type to >>=\n");
sp->u.number = argp->u.number >>= sp->u.number;
sp->subtype = 0;
}
INLINE void
f_sub_eq()
{
svalue_t *argp = (sp--)->u.lvalue;
switch(argp->type | sp->type) {
case T_NUMBER:
{
sp->u.number = argp->u.number -= sp->u.number;
sp->subtype = 0;
break;
}
case T_REAL:
{
sp->u.real = argp->u.real -= sp->u.real;
break;
}
case T_NUMBER|T_REAL:
{
if (sp->type == T_NUMBER) {
sp->type = T_REAL;
sp->u.real = argp->u.real -= sp->u.number;
} else sp->u.real = argp->u.number -= sp->u.real;
break;
}
case T_ARRAY:
{
sp->u.arr = argp->u.arr = subtract_array(argp->u.arr, sp->u.arr);
sp->u.arr->ref++;
break;
}
case T_LVALUE_BYTE | T_NUMBER:
{
char c;
c = *global_lvalue_byte.u.lvalue_byte - sp->u.number;
if (global_lvalue_byte.subtype == 0 && c == '\0')
error("Strings cannot contain 0 bytes.\n");
*global_lvalue_byte.u.lvalue_byte = c;
break;
}
default:
{
if (!(sp->type & (T_NUMBER|T_REAL|T_ARRAY))) error("Bad right type to -=\n");
else if (!(argp->type & (T_NUMBER|T_REAL|T_ARRAY))) error("Bad left type to -=\n");
else error("Arguments to -= do not match in type.\n");
}
}
}
/*
* Structure of F_SWITCH:
* table type (1 byte)
* address of table (1 short)
* address of break (1 short)
* address of default (1 short)
* then all the switch code
* switch table (varies)
*
* Table type is either
* 0xfe - integer labels, direct lookup.
* Table is followed by 1 int that is minimum key value.
* Each table entry is a short address to jump to.
* 0xfN - integer labels. N is size as a power of 2.
* Each table entry is 1 long (key) followed by 1 short (address).
* 0xNf - string labels. Otherwise same as for integer labels.
*
* For normal string or integer tables, if the address is 0 or 1,
* the key is the lower end of a range, and the upper end is in
* the next entry. If it's a 0, the second address indicates a
* direct lookup table (currently this case is never generated by
* the compiler). If it's a 1, the second address is used for
* all keys in the range (corresponds to 'case x..y:' labels).
*
* Binary search is used on the normal tables.
*/
/* offsets from 'pc' */
#define SW_TYPE 0
#define SW_TABLE 1
#define SW_ENDTAB 3
#define SW_DEFAULT 5
/* offsets used for range (L_ for lower member, U_ for upper member) */
#define L_LOWER 0
#define L_TYPE (sizeof(char *))
#define L_UPPER (SWITCH_CASE_SIZE)
#define L_ADDR (SWITCH_CASE_SIZE + sizeof(char *))
#define U_LOWER (-SWITCH_CASE_SIZE)
#define U_TYPE (-SWITCH_CASE_SIZE + sizeof(char *))
#define U_UPPER 0
#define U_ADDR (sizeof(char *))
INLINE void
f_switch()
{
unsigned short offset, end_off;
int d;
POINTER_INT s;
POINTER_INT r;
int i;
char *l, *end_tab;
static unsigned short off_tab[] =
{
0 * SWITCH_CASE_SIZE, 1 * SWITCH_CASE_SIZE, 3 * SWITCH_CASE_SIZE,
7 * SWITCH_CASE_SIZE, 15 * SWITCH_CASE_SIZE, 31 * SWITCH_CASE_SIZE,
63 * SWITCH_CASE_SIZE, 127 * SWITCH_CASE_SIZE,
255 * SWITCH_CASE_SIZE, 511 * SWITCH_CASE_SIZE,
1023 * SWITCH_CASE_SIZE, 2047 * SWITCH_CASE_SIZE,
4095 * SWITCH_CASE_SIZE, 8191 * SWITCH_CASE_SIZE,
};
COPY_SHORT(&offset, pc + SW_TABLE);
COPY_SHORT(&end_off, pc + SW_ENDTAB);
if ((i = EXTRACT_UCHAR(pc) >> 4) != 0xf) {
/* String table, find correct
* key */
if (sp->type == T_NUMBER && !sp->u.number) {
/* special case: 0 as a string */
s = 0;
sp--;
} else if (sp->type == T_STRING) {
if (sp->subtype == STRING_SHARED) {
s = (POINTER_INT)sp->u.string;
free_string(sp->u.string);
sp--;
} else {
s = (POINTER_INT)findstring(sp->u.string);
free_string_svalue(sp--);
}
if (s == 0) {
/*
* Take default case now - else we could be get confused with
* ZERO_AS_STR_CASE_LABEL.
*/
COPY_SHORT(&offset, pc + SW_DEFAULT);
pc += offset;
return;
}