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Rudimentry support for viewing weak symbols. There are two types that

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this deals with, the N_INDR indirect symbols done with .stabs operations,
and those done with .weak that have an extra field in n_other.
This commit is contained in:
Peter Wemm 1996-09-24 09:59:43 +00:00
parent 4523edce8b
commit 8a6f32e24c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=18487
3 changed files with 45 additions and 11 deletions
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10
usr.bin/nm/nm.1
View File

@ -30,7 +30,7 @@
.\" SUCH DAMAGE.
.\"
.\" @(#)nm.1 8.1 (Berkeley) 6/6/93
.\" $Id$
.\" $Id: nm.1,v 1.3 1996/08/29 18:06:05 wosch Exp $
.\"
.Dd June 6, 1993
.Dt NM 1
@ -40,7 +40,7 @@
.Nd display name list (symbol table)
.Sh SYNOPSIS
.Nm nm
.Op Fl agnoprtuw
.Op Fl agnoprtuwW
.Ar
.Sh DESCRIPTION
The symbol table (name list) of each object in
@ -80,6 +80,8 @@ Display undefined symbols only.
Warn about non-object archive members.
Normally, nm will silently ignore all archive members which are not
object files.
.It Fl W
Include an extra column in the output with a ``W'' indicating weak symbols.
.El
.Pp
Each symbol name is preceded by its value (a blank field if the symbol
@ -100,10 +102,14 @@ common symbol
data segment symbol
.It Li f
file name
.It Li I
indirect reference symbol
.It Li T
text segment symbol
.It Li U
undefined
.It Li W
warn if next symbol is referenced
.El
.Pp
If the symbol is local (non-external) the type letter is in lower case.

10
usr.bin/nm/nm.1aout
View File

@ -30,7 +30,7 @@
.\" SUCH DAMAGE.
.\"
.\" @(#)nm.1 8.1 (Berkeley) 6/6/93
.\" $Id$
.\" $Id: nm.1,v 1.3 1996/08/29 18:06:05 wosch Exp $
.\"
.Dd June 6, 1993
.Dt NM 1
@ -40,7 +40,7 @@
.Nd display name list (symbol table)
.Sh SYNOPSIS
.Nm nm
.Op Fl agnoprtuw
.Op Fl agnoprtuwW
.Ar
.Sh DESCRIPTION
The symbol table (name list) of each object in
@ -80,6 +80,8 @@ Display undefined symbols only.
Warn about non-object archive members.
Normally, nm will silently ignore all archive members which are not
object files.
.It Fl W
Include an extra column in the output with a ``W'' indicating weak symbols.
.El
.Pp
Each symbol name is preceded by its value (a blank field if the symbol
@ -100,10 +102,14 @@ common symbol
data segment symbol
.It Li f
file name
.It Li I
indirect reference symbol
.It Li T
text segment symbol
.It Li U
undefined
.It Li W
warn if next symbol is referenced
.El
.Pp
If the symbol is local (non-external) the type letter is in lower case.

36
usr.bin/nm/nm.c
View File

@ -62,6 +62,7 @@ int print_only_external_symbols;
int print_only_undefined_symbols;
int print_all_symbols;
int print_file_each_line;
int print_weak_symbols;
int fcount;
int rev, table;
@ -72,6 +73,7 @@ int (*sfunc)() = fname;
#define IS_DEBUGGER_SYMBOL(x) ((x) & N_STAB)
#define IS_EXTERNAL(x) ((x) & N_EXT)
#define SYMBOL_TYPE(x) ((x) & (N_TYPE | N_STAB))
#define SYMBOL_BIND(x) (((x) >> 4) & 0xf)
void *emalloc();
void usage __P(( void ));
@ -79,6 +81,7 @@ int process_file __P(( char * ));
int show_archive __P(( char *, FILE * ));
int show_objfile __P(( char *, FILE * ));
void print_symbol __P(( char *, struct nlist * ));
char typeletter __P((u_char));
/*
* main()
@ -93,7 +96,7 @@ main(argc, argv)
extern int optind;
int ch, errors;
while ((ch = getopt(argc, argv, "agnoprtuw")) != EOF) {
while ((ch = getopt(argc, argv, "agnoprtuwW")) != EOF) {
switch (ch) {
case 'a':
print_all_symbols = 1;
@ -122,6 +125,9 @@ main(argc, argv)
case 'w':
ignore_bad_archive_entries = 0;
break;
case 'W':
print_weak_symbols = 1;
break;
case '?':
default:
usage();
@ -471,7 +477,7 @@ print_symbol(objname, sym)
char *objname;
register struct nlist *sym;
{
char *typestring(), typeletter();
char *typestring();
if (table) {
printf("%s|", objname);
@ -481,8 +487,12 @@ print_symbol(objname, sym)
if (IS_DEBUGGER_SYMBOL(sym->n_type))
(void)printf("-|%02x %04x %5s|", sym->n_other,
sym->n_desc&0xffff, typestring(sym->n_type));
else
(void)printf("%c|", typeletter(sym->n_type));
else {
putchar(typeletter(sym->n_type));
if (print_weak_symbols && SYMBOL_BIND(sym->n_other)== 2)
putchar('W');
putchar('|');
}
/* print the symbol's name */
(void)printf("%s\n",sym->n_un.n_name);
@ -510,8 +520,17 @@ print_symbol(objname, sym)
if (IS_DEBUGGER_SYMBOL(sym->n_type))
(void)printf(" - %02x %04x %5s ", sym->n_other,
sym->n_desc&0xffff, typestring(sym->n_type));
else
(void)printf(" %c ", typeletter(sym->n_type));
else {
putchar(' ');
putchar(typeletter(sym->n_type));
if (print_weak_symbols) {
if (SYMBOL_BIND(sym->n_other) == 2)
putchar('W');
else
putchar(' ');
}
putchar(' ');
}
/* print the symbol's name */
(void)puts(sym->n_un.n_name);
@ -590,7 +609,10 @@ typeletter(type)
case N_DATA:
return(IS_EXTERNAL(type) ? 'D' : 'd');
case N_FN:
return(IS_EXTERNAL(type) ? 'F' : 'f');
/* This one is overloaded. EXT = Warn, INT = filename */
return(IS_EXTERNAL(type) ? 'W' : 'f');
case N_INDR:
return(IS_EXTERNAL(type) ? 'I' : 'i');
case N_TEXT:
return(IS_EXTERNAL(type) ? 'T' : 't');
case N_UNDF: