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/*
* nm.c -- drive nm
*/
#include <u.h>
#include <libc.h>
#include <ar.h>
#include <bio.h>
#include <mach.h>
enum{
CHUNK = 256 /* must be power of 2 */
};
char *errs; /* exit status */
char *filename; /* current file */
char symname[]="__.SYMDEF"; /* table of contents file name */
int multifile; /* processing multiple files */
int aflag;
int gflag;
int hflag;
int nflag;
int sflag;
int uflag;
Symbol **fnames; /* file path translation table */
Symbol **symptr;
int nsym;
Biobuf bout;
int cmp(void*, void*);
void error(char*, ...);
void execsyms(int);
void psym(Symbol*, void*);
void printsyms(Symbol**, long);
void doar(Biobuf*);
void dofile(Biobuf*);
void zenter(Symbol*);
void
main(int argc, char *argv[])
{
int i;
Biobuf *bin;
Binit(&bout, 1, OWRITE);
argv0 = argv[0];
ARGBEGIN {
case 'a': aflag = 1; break;
case 'g': gflag = 1; break;
case 'h': hflag = 1; break;
case 'n': nflag = 1; break;
case 's': sflag = 1; break;
case 'u': uflag = 1; break;
} ARGEND
if (argc > 1)
multifile++;
for(i=0; i<argc; i++){
filename = argv[i];
bin = Bopen(filename, OREAD);
if(bin == 0){
error("cannot open %s", filename);
continue;
}
if (isar(bin))
doar(bin);
else{
Bseek(bin, 0, 0);
dofile(bin);
}
Bterm(bin);
}
exits(errs);
}
/*
* read an archive file,
* processing the symbols for each intermediate file in it.
*/
void
doar(Biobuf *bp)
{
int offset, size, obj;
char membername[SARNAME];
multifile = 1;
for (offset = Boffset(bp);;offset += size) {
size = nextar(bp, offset, membername);
if (size < 0) {
error("phase error on ar header %ld", offset);
return;
}
if (size == 0)
return;
if (strcmp(membername, symname) == 0)
continue;
obj = objtype(bp, 0);
if (obj < 0) {
error("inconsistent file %s in %s",
membername, filename);
return;
}
if (!readar(bp, obj, offset+size, 1)) {
error("invalid symbol reference in file %s",
membername);
return;
}
filename = membername;
nsym=0;
objtraverse(psym, 0);
printsyms(symptr, nsym);
}
}
/*
* process symbols in a file
*/
void
dofile(Biobuf *bp)
{
int obj;
obj = objtype(bp, 0);
if (obj < 0)
execsyms(Bfildes(bp));
else
if (readobj(bp, obj)) {
nsym = 0;
objtraverse(psym, 0);
printsyms(symptr, nsym);
}
}
/*
* comparison routine for sorting the symbol table
* this screws up on 'z' records when aflag == 1
*/
int
cmp(void *vs, void *vt)
{
Symbol **s, **t;
s = vs;
t = vt;
if(nflag)
if((*s)->value < (*t)->value)
return -1;
else
return (*s)->value > (*t)->value;
return strcmp((*s)->name, (*t)->name);
}
/*
* enter a symbol in the table of filename elements
*/
void
zenter(Symbol *s)
{
static int maxf = 0;
if (s->value > maxf) {
maxf = (s->value+CHUNK-1) &~ (CHUNK-1);
fnames = realloc(fnames, (maxf+1)*sizeof(*fnames));
if(fnames == 0) {
error("out of memory", argv0);
exits("memory");
}
}
fnames[s->value] = s;
}
/*
* get the symbol table from an executable file, if it has one
*/
void
execsyms(int fd)
{
Fhdr f;
Symbol *s;
long n;
seek(fd, 0, 0);
if (crackhdr(fd, &f) == 0) {
error("Can't read header for %s", filename);
return;
}
if (syminit(fd, &f) < 0)
return;
s = symbase(&n);
nsym = 0;
while(n--)
psym(s++, 0);
printsyms(symptr, nsym);
}
void
psym(Symbol *s, void* p)
{
USED(p);
switch(s->type) {
case 'T':
case 'L':
case 'D':
case 'B':
if (uflag)
return;
if (!aflag && ((s->name[0] == '.' || s->name[0] == '$')))
return;
break;
case 'b':
case 'd':
case 'l':
case 't':
if (uflag || gflag)
return;
if (!aflag && ((s->name[0] == '.' || s->name[0] == '$')))
return;
break;
case 'U':
if (gflag)
return;
break;
case 'Z':
if (!aflag)
return;
break;
case 'm':
case 'f': /* we only see a 'z' when the following is true*/
if(!aflag || uflag || gflag)
return;
if (strcmp(s->name, ".frame"))
zenter(s);
break;
case 'a':
case 'p':
case 'z':
default:
if(!aflag || uflag || gflag)
return;
break;
}
symptr = realloc(symptr, (nsym+1)*sizeof(Sym*));
if (symptr == 0) {
error("out of memory");
exits("memory");
}
symptr[nsym++] = s;
}
void
printsyms(Symbol **symptr, long nsym)
{
Symbol *s;
char *cp;
char path[512];
if(!sflag)
qsort(symptr, nsym, sizeof(*symptr), cmp);
while (nsym-- > 0) {
s = *symptr++;
if (multifile && !hflag)
Bprint(&bout, "%s:", filename);
if (s->type == 'z') {
fileelem(fnames, (uchar *) s->name, path, 512);
cp = path;
} else
cp = s->name;
if (s->value || s->type == 'a' || s->type == 'p')
Bprint(&bout, "%8lux %c %s\n", s->value, s->type, cp);
else
Bprint(&bout, " %c %s\n", s->type, cp);
}
}
void
error(char *fmt, ...)
{
Fmt f;
char buf[128];
va_list arg;
fmtfdinit(&f, 2, buf, sizeof buf);
fmtprint(&f, "%s: ", argv0);
va_start(arg, fmt);
fmtvprint(&f, fmt, arg);
va_end(arg);
fmtprint(&f, "\n");
fmtfdflush(&f);
errs = "errors";
}
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