mirror of
https://github.com/cc65/cc65.git
synced 2024-11-08 13:04:52 +00:00
348 lines
9.9 KiB
C
348 lines
9.9 KiB
C
/*
|
|
!!DESCRIPTION!! C-Manual Chapter 7.2: Unary Operators
|
|
!!ORIGIN!! LCC 4.1 Testsuite
|
|
!!LICENCE!! own, freely distributeable for non-profit. read CPYRIGHT.LCC
|
|
*/
|
|
|
|
#include "common.h"
|
|
|
|
struct defs {
|
|
int cbits; /* No. of bits per char */
|
|
int ibits; /* int */
|
|
int sbits; /* short */
|
|
int lbits; /* long */
|
|
int ubits; /* unsigned */
|
|
int fbits; /* float */
|
|
int dbits; /* double */
|
|
#ifndef NO_FLOATS
|
|
float fprec; /* Smallest number that can be */
|
|
float dprec; /* significantly added to 1. */
|
|
#endif
|
|
int flgs; /* Print return codes, by section */
|
|
int flgm; /* Announce machine dependencies */
|
|
int flgd; /* give explicit diagnostics */
|
|
int flgl; /* Report local return codes. */
|
|
int rrc; /* recent return code */
|
|
int crc; /* Cumulative return code */
|
|
char rfs[8]; /* Return from section */
|
|
};
|
|
|
|
int lbits; /* long */
|
|
int ubits; /* unsigned */
|
|
int fbits; /* float */
|
|
int dbits; /* double */
|
|
#ifndef NO_FLOATS
|
|
float fprec; /* Smallest number that can be */
|
|
float dprec; /* significantly added to 1. */
|
|
#endif
|
|
int flgs; /* Print return codes, by section */
|
|
int flgm; /* Announce machine dependencies */
|
|
int flgd; /* give explicit diagnostics */
|
|
int flgl; /* Report local return codes. */
|
|
int rrc; /* recent return code */
|
|
int crc; /* Cumulative return code */
|
|
char rfs[8]; /* Return from section */
|
|
|
|
#define CQ26_INCLUDED
|
|
/*
|
|
section s26, which pokes around at the hardware
|
|
trying to figure out the characteristics of the machine that
|
|
it is running on, saves information that is subsequently
|
|
used by sections s626, s72, and s757. If this program is
|
|
to be broken up into smallish pieces, say for running on
|
|
a microcomputer, take care to see that s26 is called before
|
|
calling any of the latter three sections.
|
|
*/
|
|
|
|
/*
|
|
2.6 Hardware Characteristics
|
|
*/
|
|
|
|
#ifndef NO_OLD_FUNC_DECL
|
|
s26(pd0)
|
|
struct defs *pd0;
|
|
{
|
|
#else
|
|
s26(struct defs *pd0) {
|
|
#endif
|
|
static char qs26[8] = "s26 ";
|
|
char *ps, *pt;
|
|
char c0, c1;
|
|
#ifndef NO_FLOATS
|
|
float temp, one, delta;
|
|
double tempd, oned;
|
|
#endif
|
|
static char s[] = "%3d bits in %ss.\n";
|
|
static char s2[] = "%e is the least number that can be added to 1. (%s).\n";
|
|
|
|
ps = qs26;
|
|
pt = pd0->rfs;
|
|
|
|
while(*pt++ = *ps++);
|
|
|
|
/* Here, we shake the machinery a little to see what falls
|
|
out. First, we find out how many bits are in a char. */
|
|
|
|
pd0->cbits = 0;
|
|
c0 = 0;
|
|
c1 = 1;
|
|
|
|
while(c0 != c1) {
|
|
c1 = c1<<1;
|
|
pd0->cbits = pd0->cbits+1;
|
|
}
|
|
/* That information lets us determine the size of everything else. */
|
|
|
|
pd0->ibits = pd0->cbits * sizeof(int);
|
|
pd0->sbits = pd0->cbits * sizeof(short);
|
|
pd0->lbits = pd0->cbits * sizeof(long);
|
|
pd0->ubits = pd0->cbits * sizeof(unsigned);
|
|
#ifndef NO_FLOATS
|
|
pd0->fbits = pd0->cbits * sizeof(float);
|
|
pd0->dbits = pd0->cbits * sizeof(double);
|
|
#endif
|
|
|
|
/* We have now almost reconstructed the table in section 2.6, the
|
|
exception being the range of the floating point hardware.
|
|
Now there are just so many ways to conjure up a floating point
|
|
representation system that it's damned near impossible to guess
|
|
what's going on by writing a program to interpret bit patterns.
|
|
Further, the information isn't all that useful, if we consider
|
|
the fact that machines that won't handle numbers between 10**30
|
|
and 10**-30 are very hard to find, and that people playing with
|
|
numbers outside that range have a lot more to worry about than
|
|
just the capacity of the characteristic.
|
|
|
|
A much more useful measure is the precision, which can be ex-
|
|
pressed in terms of the smallest number that can be added to
|
|
1. without loss of significance. We calculate that here, for
|
|
float and double. */
|
|
|
|
#ifndef NO_FLOATS
|
|
one = 1.;
|
|
delta = 1.;
|
|
temp = 0.;
|
|
while(temp != one) {
|
|
temp = one+delta;
|
|
delta = delta/2.;
|
|
}
|
|
pd0->fprec = delta * 4.;
|
|
oned = 1.;
|
|
delta = 1.;
|
|
tempd = 0.;
|
|
while(tempd != oned) {
|
|
tempd = oned+delta;
|
|
delta = delta/2.;
|
|
}
|
|
pd0->dprec = delta * 4.;
|
|
#endif
|
|
|
|
/* Now, if anyone's interested, we publish the results. */
|
|
|
|
#ifndef CQ26_INCLUDED
|
|
if(pd0->flgm != 0) {
|
|
printf(s,pd0->cbits,"char");
|
|
printf(s,pd0->ibits,"int");
|
|
printf(s,pd0->sbits,"short");
|
|
printf(s,pd0->lbits,"long");
|
|
printf(s,pd0->ubits,"unsigned");
|
|
printf(s,pd0->fbits,"float");
|
|
printf(s,pd0->dbits,"double");
|
|
#ifndef NO_FLOATS
|
|
printf(s2,pd0->fprec,"float");
|
|
printf(s2,pd0->dprec,"double");
|
|
#else
|
|
printf("NO_FLOATS\n");
|
|
#endif
|
|
}
|
|
#endif
|
|
/* Since we are only exploring and perhaps reporting, but not
|
|
testing any features, we cannot return an error code. */
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifndef NO_OLD_FUNC_DECL
|
|
s72(pd0) /* 7.2 Unary operators */
|
|
struct defs *pd0;
|
|
{
|
|
#else
|
|
int s72(struct defs *pd0){
|
|
#endif
|
|
static char s72er[] = "s72,er%d\n";
|
|
static char qs72[8] = "s72 ";
|
|
int rc;
|
|
char *ps, *pt;
|
|
int k, j, i, lrc;
|
|
char c;
|
|
short s;
|
|
long l;
|
|
unsigned u;
|
|
|
|
#ifndef NO_FLOATS
|
|
double d;
|
|
float f;
|
|
#else
|
|
signed d;
|
|
signed f;
|
|
#endif
|
|
|
|
ps = qs72;
|
|
pt = pd0->rfs;
|
|
rc = 0;
|
|
while (*pt++ = *ps++);
|
|
|
|
/* The *, denoting indirection, and the &, denoting a
|
|
pointer, are duals of each other, and ought to behave as
|
|
such... */
|
|
|
|
k = 2;
|
|
if(*&*&k != 2){
|
|
rc = rc+1;
|
|
printf(s72er,1);
|
|
}
|
|
|
|
/* The unary minus has the conventional meaning. */
|
|
|
|
if(k+(-k) != 0){
|
|
rc = rc+2;
|
|
printf(s72er,2);
|
|
}
|
|
|
|
/* The negation operator (!) has been thoroughly checked out,
|
|
perhaps more thoroughly than any of the others. The ~ oper-
|
|
ator gets us a ones complement. */
|
|
|
|
k = 0;
|
|
for(j=0;j<pd0->ibits;j++) k = (k<<1)|1;
|
|
if(~k != 0){
|
|
rc = rc+4;
|
|
printf(s72er,4);
|
|
}
|
|
|
|
/* Now we look at the ++ and -- operators, which can be
|
|
used in either prefix or suffix form. With side
|
|
effects they're loaded. */
|
|
|
|
k = 5;
|
|
|
|
if( ++k != 6 || --k != 5
|
|
|| k++ != 5 || k-- != 6
|
|
|| k != 5 ){
|
|
rc = rc+8;
|
|
printf(s72er,8);
|
|
}
|
|
|
|
/* An expression preceded by the parenthesised name of a
|
|
data type causes conversion of the value of the expression
|
|
to the named type. This construction is called a cast.
|
|
Here, we check to see that all of the possible casts and
|
|
their simple combinations are accepted by the compiler,
|
|
and that they all produce a correct result for this sample
|
|
of size one. */
|
|
|
|
c = 26; l = 26;
|
|
s = 26; u = 26;
|
|
i = 26;
|
|
#ifndef NO_FLOATS
|
|
f = 26.;
|
|
d = 26.;
|
|
#else
|
|
f = 26;
|
|
d = 26;
|
|
#endif
|
|
|
|
lrc = 0;
|
|
|
|
if( (char)s != 26 || (char)i != 26
|
|
|| (char)l != 26 || (char)u != 26
|
|
|| (char)f != 26 || (char)d != 26 ) lrc = lrc+1;
|
|
|
|
if( (short)c != 26 || (short)i != 26
|
|
|| (short)l != 26 || (short)u != 26
|
|
|| (short)f != 26 || (short)d != 26) lrc = lrc+2;
|
|
|
|
if( (int)c != 26 || (int)s != 26
|
|
|| (int)l != 26 || (int)u != 26
|
|
|| (int)f != 26 || (int)d != 26 ) lrc = lrc+4;
|
|
|
|
if( (long)c != 26 || (long)s != 26
|
|
|| (long)i != 26 || (long)u != 26
|
|
|| (long)f != 26 || (long)d != 26 ) lrc = lrc+8;
|
|
|
|
if( (unsigned)c != 26 || (unsigned)s != 26
|
|
|| (unsigned)i != 26 || (unsigned)l != 26
|
|
|| (unsigned)f != 26 || (unsigned)d != 26 ) lrc = lrc+16;
|
|
|
|
#ifndef NO_FLOATS
|
|
if( (float)c != 26. || (float)s != 26.
|
|
|| (float)i != 26. || (float)l != 26.
|
|
|| (float)u != 26. || (float)d != 26. ) lrc = lrc+32;
|
|
|
|
if( (double)c != 26. || (double)s != 26.
|
|
|| (double)i != 26. || (double)l != 26.
|
|
|| (double)u != 26. || (double)f != 26. ) lrc = lrc+64;
|
|
#endif
|
|
|
|
if(lrc != 0){
|
|
rc = rc+16;
|
|
printf(s72er,16);
|
|
}
|
|
|
|
/* The sizeof operator has been tested previously. */
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*********************************************************************************************
|
|
the main loop that launches the sections
|
|
*********************************************************************************************/
|
|
|
|
#ifndef NO_TYPELESS_STRUCT_PTR
|
|
int section(int j,struct* pd0){
|
|
#else
|
|
int section(int j,void* pd0){
|
|
#endif
|
|
switch(j){
|
|
case 0: return s26(pd0);
|
|
case 1: return s72(pd0);
|
|
}
|
|
}
|
|
|
|
#define cq_sections 2
|
|
|
|
/*
|
|
C REFERENCE MANUAL (main)
|
|
*/
|
|
|
|
#ifndef NO_OLD_FUNC_DECL
|
|
main(n,args)
|
|
int n;
|
|
char **args;
|
|
{
|
|
#else
|
|
int main(int n,char **args) {
|
|
#endif
|
|
|
|
int j;
|
|
static struct defs d0, *pd0;
|
|
|
|
d0.flgs = 1; /* These flags dictate */
|
|
d0.flgm = 1; /* the verbosity of */
|
|
d0.flgd = 1; /* the program. */
|
|
d0.flgl = 1;
|
|
|
|
pd0 = &d0;
|
|
|
|
for (j=0; j<cq_sections; j++) {
|
|
d0.rrc=section(j,pd0);
|
|
d0.crc=d0.crc+d0.rrc;
|
|
if(d0.flgs != 0) printf("Section %s returned %d.\n",d0.rfs,d0.rrc);
|
|
}
|
|
|
|
if(d0.crc == 0) printf("\nNo errors detected.\n");
|
|
else printf("\nFailed.\n");
|
|
|
|
return d0.crc;
|
|
}
|