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/* as.c - GAS main program.
Copyright (C) 1987, 1990, 1991, 1992, 1994 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 2, 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.
*
*/
#include "ansidecl.h"
#include "libiberty.h"
#include <stdio.h>
#include <string.h>
#ifdef _POSIX_SOURCE
#include <sys/types.h> /* For pid_t in signal.h */
#endif
#include <signal.h>
#define COMMON
#include "as.h"
#include "subsegs.h"
#include "output-file.h"
#ifndef SIGTY
#ifdef __STDC__
#define SIGTY void
#else
#define SIGTY int
#endif /* __STDC__ */
#endif /* SIGTY */
#if 0
/* Not currently used. */
static SIGTY got_sig PARAMS ((int sig));
#endif
static void perform_an_assembly_pass PARAMS ((int argc, char **argv));
#ifndef EXIT_SUCCESS
#define EXIT_SUCCESS 0
#define EXIT_FAILURE 1
#endif
int listing; /* true if a listing is wanted */
char *myname; /* argv[0] */
#ifdef BFD_ASSEMBLER
segT reg_section, expr_section;
segT text_section, data_section, bss_section;
#endif
/* This is true if the assembler should output time and space usage. */
static int statistics_flag = 0;
void
print_version_id ()
{
static int printed;
if (printed)
return;
printed = 1;
fprintf (stderr, "GNU assembler version %s (%s)", GAS_VERSION, TARGET_ALIAS);
#ifdef BFD_ASSEMBLER
fprintf (stderr, ", using BFD version %s", BFD_VERSION);
#endif
fprintf (stderr, "\n");
}
int
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 -) */
int keep_it;
long start_time = get_run_time ();
#if 0 /* do we need any of this?? */
{
static const int sig[] = {SIGHUP, SIGINT, SIGPIPE, SIGTERM, 0};
for (a = 0; sig[a] != 0; a++)
if (signal (sig[a], SIG_IGN) != SIG_IGN)
signal (sig[a], got_sig);
}
#endif
myname = argv[0];
memset (flagseen, '\0', sizeof (flagseen)); /* aint seen nothing yet */
#ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
#define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
#endif
out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
#ifdef BFD_ASSEMBLER
bfd_init ();
#endif
symbol_begin ();
subsegs_begin ();
read_begin ();
input_scrub_begin ();
frag_init ();
/*
* 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.
*/
/* FIXME-SOMEDAY this should use getopt. */
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. */
/* Handle double-dash options. */
if (arg[1] == '-')
{
if (arg[2] == 0)
{
/* "--" as an argument means read stdin. */
/* On this scan, we don't want to think about filenames. */
*work_argv = ""; /* A code that means 'use stdin'. */
}
else if (strcmp (arg, "--statistics") == 0)
{
statistics_flag = 1;
*work_argv = NULL;
}
#ifdef md_parse_long_option
else if (md_parse_long_option (arg))
*work_argv = NULL;
#endif
else
{
as_warn ("Unknown option `%s' ignored", arg);
*work_argv = NULL;
}
continue;
}
/* This better be a switch. */
arg++; /*->letter. */
while ((a = *arg) != '\0')
{ /* scan all the 1-char flags */
arg++; /* arg->after letter. */
a &= 0x7F; /* ascii only please */
flagseen[(unsigned char) a] = 1;
switch (a)
{
case 'a':
{
int loop = 1;
while (loop)
{
switch (*arg)
{
case 'l':
listing |= LISTING_LISTING;
arg++;
break;
case 's':
listing |= LISTING_SYMBOLS;
arg++;
break;
case 'h':
listing |= LISTING_HLL;
arg++;
break;
case 'n':
listing |= LISTING_NOFORM;
arg++;
break;
case 'd':
listing |= LISTING_NODEBUG;
arg++;
break;
default:
if (!listing)
listing = LISTING_DEFAULT;
loop = 0;
break;
}
}
}
break;
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;
case 'I':
{ /* Include file directory */
char *temp = NULL;
if (*arg)
{
temp = strdup (arg);
if (!temp)
as_fatal ("virtual memory exhausted");
}
else if (work_argc)
{
*work_argv = NULL;
work_argc--;
temp = *++work_argv;
}
else
as_warn ("%s: I expected a filename after -I", myname);
add_include_dir (temp);
arg = ""; /* Finished with this arg. */
break;
}
#ifdef WARN_SIGNED_OVERFLOW_WORD
/* Don't warn about signed overflow. */
case 'J':
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 = strdup (arg);
if (!out_file_name)
as_fatal ("virtual memory exhausted");
}
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 'n':
if (*arg && strcmp(arg, "ocpp") == 0)
;
else
{
as_warn ("Unknown option `-n%s' ignored", arg);
arg += strlen (arg);
break;
}
case 'R':
/* -R means put data into text segment */
flag_readonly_data_in_text = 1;
break;
case 'v':
#ifdef VMS
{
extern char *compiler_version_string;
compiler_version_string = arg;
}
#else /* not VMS */
if (*arg && strcmp (arg, "ersion"))
{
as_warn ("Unknown option `-v%s' ignored", arg);
arg += strlen (arg);
break;
}
print_version_id ();
#endif /* not VMS */
while (*arg)
arg++; /* Skip the rest */
break;
case 'W':
/* -W means don't warn about things */
flag_suppress_warnings = 1;
break;
case 'w':
case 'X':
/* -X means treat warnings as errors */
break;
case 'Z':
/* -Z means attempt to generate object file even after errors. */
flag_always_generate_output = 1;
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 BFD_ASSEMBLER
output_file_create (out_file_name);
assert (stdoutput != 0);
#endif
#ifdef tc_init_after_args
tc_init_after_args ();
#endif
/* Here with flags set up in flagseen[]. */
perform_an_assembly_pass (argc, argv); /* Assemble it. */
#ifdef TC_I960
brtab_emit ();
#endif
if (seen_at_least_1_file ()
&& !((had_warnings () && flag_always_generate_output)
|| had_errors () > 0))
keep_it = 1;
else
keep_it = 0;
if (keep_it)
write_object_file ();
#ifndef NO_LISTING
listing_print ("");
#endif
#ifndef OBJ_VMS /* does its own file handling */
#ifndef BFD_ASSEMBLER
if (keep_it)
#endif
output_file_close (out_file_name);
#endif
if (!keep_it)
unlink (out_file_name);
input_scrub_end ();
#ifdef md_end
md_end ();
#endif
if (statistics_flag)
{
extern char **environ;
char *lim = (char *) sbrk (0);
long run_time = get_run_time () - start_time;
fprintf (stderr, "%s: total time in assembly: %ld.%06ld\n",
myname, run_time / 1000000, run_time % 1000000);
fprintf (stderr, "%s: data size %ld\n",
myname, (long) (lim - (char *) &environ));
}
if ((had_warnings () && flagseen['Z'])
|| had_errors () > 0)
return EXIT_FAILURE;
return EXIT_SUCCESS;
}
/* 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.
*/
static void
perform_an_assembly_pass (argc, argv)
int argc;
char **argv;
{
int saw_a_file = 0;
#ifdef BFD_ASSEMBLER
flagword applicable;
#endif
need_pass_2 = 0;
#ifndef BFD_ASSEMBLER
#ifdef MANY_SEGMENTS
{
unsigned int i;
for (i = SEG_E0; i < SEG_UNKNOWN; i++)
segment_info[i].fix_root = 0;
}
/* Create the three fixed ones */
{
segT seg;
#ifdef TE_APOLLO
seg = subseg_new (".wtext", 0);
#else
seg = subseg_new (".text", 0);
#endif
assert (seg == SEG_E0);
seg = subseg_new (".data", 0);
assert (seg == SEG_E1);
seg = subseg_new (".bss", 0);
assert (seg == SEG_E2);
#ifdef TE_APOLLO
create_target_segments ();
#endif
}
#else /* not MANY_SEGMENTS */
text_fix_root = NULL;
data_fix_root = NULL;
bss_fix_root = NULL;
#endif /* not MANY_SEGMENTS */
#else /* BFD_ASSEMBLER */
/* Create the standard sections, and those the assembler uses
internally. */
text_section = subseg_new (".text", 0);
data_section = subseg_new (".data", 0);
bss_section = subseg_new (".bss", 0);
/* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
to have relocs, otherwise we don't find out in time. */
applicable = bfd_applicable_section_flags (stdoutput);
bfd_set_section_flags (stdoutput, text_section,
applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
| SEC_CODE | SEC_READONLY));
/* @@ FIXME -- SEC_CODE seems to mean code only, rather than code possibly.*/
bfd_set_section_flags (stdoutput, data_section,
applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC));
bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
seg_info (bss_section)->bss = 1;
subseg_new (BFD_ABS_SECTION_NAME, 0);
subseg_new (BFD_UND_SECTION_NAME, 0);
reg_section = subseg_new ("*GAS `reg' section*", 0);
expr_section = subseg_new ("*GAS `expr' section*", 0);
#endif /* BFD_ASSEMBLER */
subseg_set (text_section, 0);
/* This may add symbol table entries, which requires having an open BFD,
and sections already created, in BFD_ASSEMBLER mode. */
md_begin ();
argv++; /* skip argv[0] */
argc--; /* skip argv[0] */
while (argc--)
{
if (*argv)
{ /* Is it a file-name argument? */
saw_a_file++;
/* argv->"" if stdin desired, else->filename */
read_a_source_file (*argv);
}
argv++; /* completed that argv */
}
if (!saw_a_file)
read_a_source_file ("");
} /* perform_an_assembly_pass() */
#if 0
/* This is not currently used. */
static SIGTY
got_sig (sig)
int sig;
{
static here_before = 0;
as_bad ("Interrupted by signal %d", sig);
if (here_before++)
exit (EXIT_FAILURE);
#if 0 /* If SIGTY is void, this produces warnings. */
return ((SIGTY) 0);
#endif
}
#endif
/* end of as.c */
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