3BSD/usr/src/cmd/sdb/prvar.c
#include "head.h"
#include <a.out.h>
#include "cdefs.h"
struct user u;
BKPTR bkpthead;
STRING errflg;
/*
* outvar():
* Prints named variable, recursing once for each structure member or
* subscript.
* proc:var: variable name
* fmt: print format
* metaflag: set iff var contains metacharacters * or ?
* addr: partial address of variable, initally 0
* class: type class of variable
* subflag: number of levels of subscript indirection
* prnamep: pointer to end of partially formed print name of variable
* comblk: name of common block containing variable, if any
* prflag: as in findvar
*
* Here and elsewhere we assume that -1 is an invalid address, and
* its is used to indicate error.
*/
outvar(proc, var, fmt, metaflag, addr, class, subflag, prnamep, comblk, prflag)
ADDR addr; char *proc, *var, *fmt, class, *prnamep, *comblk; {
char *p, *q, *r, *oldpr;
register int match;
long soffset, goffset;
register ADDR newaddr = -1, arrowaddr;
register enum {INIT, ARROW, DOT} typeflag;
switch (var[0]) {
case '\0':
if (prflag == 0) return(addr);
if (metaflag) {
if (comblk[0] && !(eqstr(comblk, "*")))
printf("%.8s:%.8s", comblk, prname);
else if (proc[0])
printf("%.8s:%.8s", proc, prname);
else
printf("%s", prname);
if (prflag == 1)
printf("/ ");
else
printf("= ");
}
if (prflag == 1)
dispf(addr, fmt, class, sl_type, sl_size, subflag);
else
dispf(addr, fmt, 0, -1, 0, 0);
return(addr);
case '[':
*prnamep++ = *var++;
p = var;
for (;;) {
*prnamep++ = *var;
if (*var == '\0' || *var == ']') break;
var++;
}
newaddr = getindir(class, addr, sl_type);
newaddr += typetosize(sl_type, sl_size) * readint(&p);
return(outvar(proc, var+1, fmt, metaflag, newaddr, N_GSYM,
subflag+1, prnamep, comblk, prflag));
case '-':
case '>':
typeflag = ARROW;
while (eqany(*var, "->"))
*prnamep++ = *var++;
subflag++;
arrowaddr = getindir(class, addr, sl_type);
if (errflg) {
printf("%s\n", errflg);
errflg = 0;
return(0);
}
class = N_GSYM;
if (var[0] == '\0') {
p = var;
goto recurse;
}
break;
case '.':
typeflag = DOT;
if (class == N_RSYM) {
error("Not with a register variable");
return(0);
}
*prnamep++ = *var++;
subflag = 0;
break;
default:
typeflag = INIT;
break;
}
if (typeflag == INIT) {
soffset = proc[0] ? adrtostoffset(callpc-1) : -1;
goffset = proc[0] ? -1 : findfile(curfile)->stf_offset;
} else {
soffset = proc[0] ? adrtostoffset(callpc-1) : -1;
goffset = findfile(curfile)->stf_offset;
}
p = var;
oldpr = prnamep;
while (!eqany(*p, "->.[") && *p != '\0')
*prnamep++ = *p++;
*prnamep = '\0';
match = 0;
slookinit();
for (;;) {
if (soffset != -1)
if ((soffset = slooknext(var, soffset, typeflag!=INIT,
comblk)) != -1)
goto found;
if (goffset != -1)
if ((goffset = globallookup(var, goffset,
typeflag!=INIT)) != -1)
goto found;
return(newaddr);
found:
r = sl_name;
q = oldpr;
while (*r) *q++ = *r++;
*q ='\0';
switch(typeflag) {
case INIT:
class = sl_class & STABMASK;
if (!varclass(class) || class == N_SSYM)
goto l;
newaddr = (class == N_LSYM) ? -sl_addr : sl_addr;
newaddr = formaddr(class, newaddr);
break;
case ARROW:
class = sl_class & STABMASK;
if (!varclass(class) || class != N_SSYM)
goto l;
newaddr = arrowaddr + sl_addr;
break;
case DOT:
class = sl_class & STABMASK;
if (!varclass(class) || class != N_SSYM)
goto l;
newaddr = addr + sl_addr;
break;
}
recurse:
newaddr = outvar(proc, p, fmt, metaflag, newaddr,
class, subflag, prnamep, comblk, prflag);
if (!metaflag)
return(newaddr);
l:; }
}
prdebug() {
register struct proct *procp;
register struct filet *filep;
printf("dot=%d\n", dot);
printf("extstart = %d\n", extstart);
for(filep=files;filep->sfilename[0];filep++)
printf("%s offs %d @ %d flag %d addr 0x%x\n", filep->sfilename, filep->stf_offset, filep, filep->lineflag, filep->faddr);
for(procp=procs;procp->pname[0];procp++) {
printf("%8.8s addr 0x%x; offs %d; sfptr %d; line %d",
procp->pname, procp->paddr, procp->st_offset,
procp->sfptr, procp->lineno);
if (procp->entrypt) printf(" entrypoint");
printf("\n");
}
}
/* display addr using format desc or class s */
dispf(addr, desc, class, type, size, subflag)
char *desc; short type; ADDR addr; {
dispx(addr, desc, class, type, size, subflag);
printf("\n");
}
char pd[] = "%x";
dispx(addr, desc, class, type, size, subflag)
char *desc; short type; ADDR addr; {
int i, sflag;
char *p;
char dlen, dfmt;
long value;
union {
struct {
char c[WORDSIZE];
};
struct {
int w;
};
struct {
float f;
}
} word;
union {
struct{
int w1, w2;
};
struct {
double d;
};
} dbl;
class &= STABMASK;
if (desc[0] == '\0') desc = typetodesc(type, subflag);
cpstr(odesc, desc);
otype = type;
oclass = class;
oaddr = addr;
oincr = 0;
if (debug) printf("dispf(%d,%s,0%o,0%o)\n", addr,desc,class,type);
pd[1] = dfmt = 'd';
dlen = '\0';
for (p = desc; *p; p++) {
if (*p>= '0' && *p<'9') {
size = readint(&p);
p--;
} else switch (*p) {
case 'l':
case 'h':
case 'b':
dlen = *p;
break;
case 'a':
case 'c':
case 'd':
case 'f':
case 'g':
case 'o':
case 'p':
case 's':
case 'u':
case 'x':
pd[1] = dfmt = *p;
break;
default:
printf("Illegal descriptor: %c\n", *p);
return;
}
}
if (type == -1)
value = addr;
else if (class == N_RSYM && addr < 16) {
/* MACHINE DEPENDENT */
if ((addr > 0 && addr < 6) || addr > 11) {
printf("Bad register var %d\n", addr);
return;
}
value = *(ADDR *)(((ADDR) &u) + R0 + (WORDSIZE)*addr);
}
else {
value = getval(addr, dfmt == 'g' ? 'd' : dfmt);
}
if (errflg) {
printf("%s", errflg);
errflg = 0;
return;
}
switch (dfmt) {
default:
switch (dfmt) {
case 'u':
case 'x':
case 'o':
switch (dlen) {
case 'h':
value = (unsigned short) value;
oincr = 2;
break;
case 'b':
value = (unsigned char) value;
oincr = 1;
break;
case 'l':
value = (unsigned long) value;
oincr = 4;
break;
}
break;
default:
switch (dlen) {
case 'h':
value = (short) value;
oincr = 2;
break;
case 'b':
value = (char) value;
oincr = 1;
break;
case 'l':
value = (long) value;
oincr = 4;
break;
}
}
if (value > 0) {
if (value > 9 && dfmt == 'x')
printf("0x");
else if (value > 7 && dfmt == 'o')
printf("0");
}
printf(pd, value);
return;
case 'f':
pd[1] = 'g';
word.w = value;
printf(pd, word.f);
return;
case 'g':
dbl.w1 = value;
dbl.w2 = (class == (char) N_RSYM) ?
*(ADDR *)(((ADDR) &u)+R0+(WORDSIZE)*(addr+1)) :
getval(addr+WORDSIZE, 'd');
printf("%.13g", dbl.d);
return;
case 'p':
printf("%s:%d", adrtoprocp(value)->pname,
adrtolineno(value));
return;
case 's':
addr = getindir(class, addr, type);
goto aa;
case 'c':
if (size <= 1) {
oincr = 1;
printchar(value);
return;
} else
goto aa;
case 'a':
aa: sflag = size == 0;
if (sflag)
size = 128; /* maximum length for s and a */
else
oincr = size;
for (;;) {
word.w = getval(addr, 'd');
for (i=0; i<WORDSIZE; i++) {
if (sflag && word.c[i] == 0)
return;
if (size-- == 0)
return;
printchar(word.c[i]);
}
addr += WORDSIZE;
}
}
}
printchar(c) {
if ((c & 0177) < ' ')
printf("^%c", c + ('A' - 1));
else if ((c & 0177) == 0177)
printf("^?");
else
printf("%c", c);
}