4.4BSD/usr/src/contrib/gas-1.38/as.c
/*-
* This code is derived from software copyrighted by the Free Software
* Foundation.
*
* Modified 1991 by Donn Seeley at UUNET Technologies, Inc.
*/
#ifndef lint
static char sccsid[] = "@(#)as.c 6.3 (Berkeley) 5/8/91";
#endif /* not lint */
/* as.c - GAS main program.
Copyright (C) 1987 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/*
* Main program for AS; a 32-bit assembler of GNU.
* Understands command arguments.
* Has a few routines that don't fit in other modules because they
* are shared.
*
*
* bugs
*
* : initialisers
* Since no-one else says they will support them in future: I
* don't support them now.
*
*/
#ifdef _POSIX_SOURCE
#include <sys/types.h> /* For pid_t in signal.h */
#endif
#include <signal.h>
#define COMMON
#include "as.h"
#include "struc-symbol.h"
#include "write.h"
/* Warning! This may have some slightly strange side effects
if you try to compile two or more assemblers in the same
directory!
*/
#ifndef SIGTY
#define SIGTY int
#endif
SIGTY got_sig();
#ifdef DONTDEF
static char * gdb_symbol_file_name;
long int gdb_begin();
#endif
char *myname; /* argv[0] */
extern char version_string[];
main(argc,argv)
int argc;
char **argv;
{
int work_argc; /* variable copy of argc */
char **work_argv; /* variable copy of argv */
char *arg; /* an arg to program */
char a; /* an arg flag (after -) */
static const int sig[] = { SIGHUP, SIGINT, SIGPIPE, SIGTERM, 0};
extern int bad_error; /* Did we hit a bad error ? */
char *stralloc(); /* Make a (safe) copy of a string. */
void symbol_begin();
void read_begin();
void write_object_file();
for(a=0;sig[a]!=0;a++)
if(signal(sig[a], SIG_IGN) != SIG_IGN)
signal(sig[a], got_sig);
myname=argv[0];
bzero (flagseen, sizeof(flagseen)); /* aint seen nothing yet */
out_file_name = "a.out"; /* default .o file */
symbol_begin(); /* symbols.c */
subsegs_begin(); /* subsegs.c */
read_begin(); /* read.c */
md_begin(); /* MACHINE.c */
input_scrub_begin(); /* input_scrub.c */
#ifdef DONTDEF
gdb_symbol_file_name = 0;
#endif
/*
* Parse arguments, but we are only interested in flags.
* When we find a flag, we process it then make it's argv[] NULL.
* This helps any future argv[] scanners avoid what we processed.
* Since it is easy to do here we interpret the special arg "-"
* to mean "use stdin" and we set that argv[] pointing to "".
* After we have munged argv[], the only things left are source file
* name(s) and ""(s) denoting stdin. These file names are used
* (perhaps more than once) later.
*/
work_argc = argc-1; /* don't count argv[0] */
work_argv = argv+1; /* skip argv[0] */
for (;work_argc--;work_argv++) {
arg = * work_argv; /* work_argv points to this argument */
if (*arg!='-') /* Filename. We need it later. */
continue; /* Keep scanning args looking for flags. */
if (arg[1] == '-' && arg[2] == 0) {
/* "--" as an argument means read STDIN */
/* on this scan, we don't want to think about filenames */
* work_argv = ""; /* Code that means 'use stdin'. */
continue;
}
/* This better be a switch. */
arg ++; /* -> letter. */
while (a = * arg) {/* scan all the 1-char flags */
arg ++; /* arg -> after letter. */
a &= 0x7F; /* ascii only please */
if (flagseen[a])
as_warn("%s: Flag option -%c has already been seen!",myname,a);
flagseen[a] = TRUE;
switch (a) {
case 'f':
break; /* -f means fast - no need for "app" preprocessor. */
case 'D':
/* DEBUG is implemented: it debugs different */
/* things to other people's assemblers. */
break;
#ifdef DONTDEF
case 'G': /* GNU AS switch: include gdbsyms. */
if (*arg) /* Rest of argument is file-name. */
gdb_symbol_file_name = stralloc (arg);
else if (work_argc) { /* Next argument is file-name. */
work_argc --;
* work_argv = NULL; /* Not a source file-name. */
gdb_symbol_file_name = * ++ work_argv;
} else
as_warn( "%s: I expected a filename after -G",myname);
arg = ""; /* Finished with this arg. */
break;
#endif
#ifndef WORKING_DOT_WORD
case 'k':
break;
#endif
case 'L': /* -L means keep L* symbols */
break;
case 'o':
if (*arg) /* Rest of argument is object file-name. */
out_file_name = stralloc (arg);
else if (work_argc) { /* Want next arg for a file-name. */
* work_argv = NULL; /* This is not a file-name. */
work_argc--;
out_file_name = * ++ work_argv;
} else
as_warn("%s: I expected a filename after -o. \"%s\" assumed.",myname,out_file_name);
arg = ""; /* Finished with this arg. */
break;
case 'R':
/* -R means put data into text segment */
break;
case 'v':
#ifdef VMS
{
extern char *compiler_version_string;
compiler_version_string = arg;
}
#else /* not VMS */
fprintf(stderr,version_string);
if(*arg && strcmp(arg,"ersion"))
as_warn("Unknown -v option ignored");
#endif
while(*arg) arg++; /* Skip the rest */
break;
case 'W':
/* -W means don't warn about things */
break;
case 'g':
/*
* -g asks gas to produce gdb/dbx line number
* and file name stabs so that an assembly
* file can be handled by a source debugger.
*/
break;
default:
--arg;
if(md_parse_option(&arg,&work_argc,&work_argv)==0)
as_warn("%s: I don't understand '%c' flag!",myname,a);
if(arg && *arg)
arg++;
break;
}
}
/*
* We have just processed a "-..." arg, which was not a
* file-name. Smash it so the
* things that look for filenames won't ever see it.
*
* Whatever work_argv points to, it has already been used
* as part of a flag, so DON'T re-use it as a filename.
*/
*work_argv = NULL; /* NULL means 'not a file-name' */
}
#ifdef DONTDEF
if (gdb_begin(gdb_symbol_file_name) == 0)
flagseen ['G'] = 0; /* Don't do any gdbsym stuff. */
#endif
/* Here with flags set up in flagseen[]. */
perform_an_assembly_pass(argc,argv); /* Assemble it. */
if (seen_at_least_1_file() && !bad_error)
write_object_file();/* relax() addresses then emit object file */
input_scrub_end();
md_end(); /* MACHINE.c */
#ifndef VMS
exit(bad_error); /* WIN */
#else /* VMS */
exit(!bad_error); /* WIN */
#endif /* VMS */
}
/* perform_an_assembly_pass()
*
* Here to attempt 1 pass over each input file.
* We scan argv[*] looking for filenames or exactly "" which is
* shorthand for stdin. Any argv that is NULL is not a file-name.
* We set need_pass_2 TRUE if, after this, we still have unresolved
* expressions of the form (unknown value)+-(unknown value).
*
* Note the un*x semantics: there is only 1 logical input file, but it
* may be a catenation of many 'physical' input files.
*/
perform_an_assembly_pass (argc, argv)
int argc;
char ** argv;
{
char * buffer; /* Where each bufferful of lines will start. */
void read_a_source_file();
int saw_a_file = 0;
text_fix_root = NULL;
data_fix_root = NULL;
need_pass_2 = FALSE;
argv++; /* skip argv[0] */
argc--; /* skip argv[0] */
while (argc--) {
if (*argv) { /* Is it a file-name argument? */
/* argv -> "" if stdin desired, else -> filename */
if (buffer = input_scrub_new_file (*argv) ) {
saw_a_file++;
read_a_source_file(buffer);
}
}
argv++; /* completed that argv */
}
if(!saw_a_file)
if(buffer = input_scrub_new_file("") )
read_a_source_file(buffer);
}
/*
* stralloc()
*
* Allocate memory for a new copy of a string. Copy the string.
* Return the address of the new string. Die if there is any error.
*/
char *
stralloc (str)
char * str;
{
register char * retval;
register long int len;
len = strlen (str) + 1;
retval = xmalloc (len);
(void)strcpy (retval, str);
return (retval);
}
lose()
{
as_fatal( "%s: 2nd pass not implemented - get your code from random(3)",myname );
}
SIGTY
got_sig(sig)
int sig;
{
static here_before = 0;
as_bad("Interrupted by signal %d",sig);
if(here_before++)
exit(1);
}
/* end: as.c */