usr/src/usr.bin/gas/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[];
\f
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 */
}

\f
/*                      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);
}
\f
/*
 *                      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);
}
\f
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 */