nasm.c

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/* The Netwide Assembler main program module
 *
 * The Netwide Assembler is copyright (C) 1996 Simon Tatham and
 * Julian Hall. All rights reserved. The software is
 * redistributable under the licence given in the file "Licence"
 * distributed in the NASM archive.
 */

#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include "nasm.h"
#include "nasmlib.h"
#include "insns.h"
#include "preproc.h"
#include "parser.h"
#include "eval.h"
#include "assemble.h"
#include "labels.h"
#include "outform.h"
#include "listing.h"

struct forwrefinfo {            /* info held on forward refs. */
    int lineno;
    int operand;
};

static int get_bits(char *value);
static unsigned long get_cpu(char *cpu_str);
static void parse_cmdline(int, char **);
static void assemble_file(char *);
static int getkw(char **directive, char **value);
static void register_output_formats(void);
static void report_error_gnu(int severity, const char *fmt, ...);
static void report_error_vc(int severity, const char *fmt, ...);
static void report_error_common(int severity, const char *fmt,
                                va_list args);
static int is_suppressed_warning(int severity);
static void usage(void);
static efunc report_error;

static int using_debug_info, opt_verbose_info;
int tasm_compatible_mode = FALSE;
int pass0;

static char inname[FILENAME_MAX];
static char outname[FILENAME_MAX];
static char listname[FILENAME_MAX];
static int globallineno;        /* for forward-reference tracking */
/* static int pass = 0; */
static struct ofmt *ofmt = NULL;

static FILE *error_file;        /* Where to write error messages */

static FILE *ofile = NULL;
int optimizing = -1;            /* number of optimization passes to take */
static int sb, cmd_sb = 16;     /* by default */
static unsigned long cmd_cpu = IF_PLEVEL;       /* highest level by default */
static unsigned long cpu = IF_PLEVEL;   /* passed to insn_size & assemble.c */
int global_offset_changed;      /* referenced in labels.c */

static loc_t location;
int in_abs_seg;                 /* Flag we are in ABSOLUTE seg */
long abs_seg;                   /* ABSOLUTE segment basis */
long abs_offset;                /* ABSOLUTE offset */

static struct RAA *offsets;

static struct SAA *forwrefs;    /* keep track of forward references */
static struct forwrefinfo *forwref;

static Preproc *preproc;
enum op_type {
    op_normal,                  /* Preprocess and assemble */
    op_preprocess,              /* Preprocess only */
    op_depend                   /* Generate dependencies */
};
static enum op_type operating_mode;

/*
 * Which of the suppressible warnings are suppressed. Entry zero
 * doesn't do anything. Initial defaults are given here.
 */
static char suppressed[1 + ERR_WARN_MAX] = {
    0, TRUE, TRUE, TRUE, FALSE, TRUE
};

/*
 * The option names for the suppressible warnings. As before, entry
 * zero does nothing.
 */
static const char *suppressed_names[1 + ERR_WARN_MAX] = {
    NULL, "macro-params", "macro-selfref", "orphan-labels",
        "number-overflow",
    "gnu-elf-extensions"
};

/*
 * The explanations for the suppressible warnings. As before, entry
 * zero does nothing.
 */
static const char *suppressed_what[1 + ERR_WARN_MAX] = {
    NULL,
    "macro calls with wrong no. of params",
    "cyclic macro self-references",
    "labels alone on lines without trailing `:'",
    "numeric constants greater than 0xFFFFFFFF",
    "using 8- or 16-bit relocation in ELF, a GNU extension"
};

/*
 * This is a null preprocessor which just copies lines from input
 * to output. It's used when someone explicitly requests that NASM
 * not preprocess their source file.
 */

static void no_pp_reset(char *, int, efunc, evalfunc, ListGen *);
static char *no_pp_getline(void);
static void no_pp_cleanup(int);
static Preproc no_pp = {
    no_pp_reset,
    no_pp_getline,
    no_pp_cleanup
};

/*
 * get/set current offset...
 */
#define GET_CURR_OFFS (in_abs_seg?abs_offset:\
		      raa_read(offsets,location.segment))
#define SET_CURR_OFFS(x) (in_abs_seg?(void)(abs_offset=(x)):\
			 (void)(offsets=raa_write(offsets,location.segment,(x))))

static int want_usage;
static int terminate_after_phase;
int user_nolist = 0;            /* fbk 9/2/00 */

static void nasm_fputs(const char *line, FILE * outfile)
{
    if (outfile) {
        fputs(line, outfile);
        fputc('\n', outfile);
    } else
        puts(line);
}

int main(int argc, char **argv)
{
    pass0 = 1;
    want_usage = terminate_after_phase = FALSE;
    report_error = report_error_gnu;

    nasm_set_malloc_error(report_error);
    offsets = raa_init();
    forwrefs = saa_init((long)sizeof(struct forwrefinfo));

    preproc = &nasmpp;
    operating_mode = op_normal;

    error_file = stderr;

    seg_init();

    register_output_formats();

    parse_cmdline(argc, argv);

    if (terminate_after_phase) {
        if (want_usage)
            usage();
        return 1;
    }

    /* If debugging info is disabled, suppress any debug calls */
    if (!using_debug_info)
        ofmt->current_dfmt = &null_debug_form;

    if (ofmt->stdmac)
        pp_extra_stdmac(ofmt->stdmac);
    parser_global_info(ofmt, &location);
    eval_global_info(ofmt, lookup_label, &location);

    /* define some macros dependent of command-line */
    {
        char temp[64];
        snprintf(temp, sizeof(temp), "__OUTPUT_FORMAT__=%s\n",
                 ofmt->shortname);
        pp_pre_define(temp);
    }

    switch (operating_mode) {
    case op_depend:
        {
            char *line;
            preproc->reset(inname, 0, report_error, evaluate, &nasmlist);
            if (outname[0] == '\0')
                ofmt->filename(inname, outname, report_error);
            ofile = NULL;
            fprintf(stdout, "%s: %s", outname, inname);
            while ((line = preproc->getline()))
                nasm_free(line);
            preproc->cleanup(0);
            putc('\n', stdout);
        }
        break;

    case op_preprocess:
        {
            char *line;
            char *file_name = NULL;
            long prior_linnum = 0;
            int lineinc = 0;

            if (*outname) {
                ofile = fopen(outname, "w");
                if (!ofile)
                    report_error(ERR_FATAL | ERR_NOFILE,
                                 "unable to open output file `%s'",
                                 outname);
            } else
                ofile = NULL;

            location.known = FALSE;

/*      pass = 1; */
            preproc->reset(inname, 2, report_error, evaluate, &nasmlist);
            while ((line = preproc->getline())) {
                /*
                 * We generate %line directives if needed for later programs
                 */
                long linnum = prior_linnum += lineinc;
                int altline = src_get(&linnum, &file_name);
                if (altline) {
                    if (altline == 1 && lineinc == 1)
                        nasm_fputs("", ofile);
                    else {
                        lineinc = (altline != -1 || lineinc != 1);
                        fprintf(ofile ? ofile : stdout,
                                "%%line %ld+%d %s\n", linnum, lineinc,
                                file_name);
                    }
                    prior_linnum = linnum;
                }
                nasm_fputs(line, ofile);
                nasm_free(line);
            }
            nasm_free(file_name);
            preproc->cleanup(0);
            if (ofile)
                fclose(ofile);
            if (ofile && terminate_after_phase)
                remove(outname);
        }
        break;

    case op_normal:
        {
            /*
             * We must call ofmt->filename _anyway_, even if the user
             * has specified their own output file, because some
             * formats (eg OBJ and COFF) use ofmt->filename to find out
             * the name of the input file and then put that inside the
             * file.
             */
            ofmt->filename(inname, outname, report_error);

            ofile = fopen(outname, "wb");
            if (!ofile) {
                report_error(ERR_FATAL | ERR_NOFILE,
                             "unable to open output file `%s'", outname);
            }

            /*
             * We must call init_labels() before ofmt->init() since
             * some object formats will want to define labels in their
             * init routines. (eg OS/2 defines the FLAT group)
             */
            init_labels();

            ofmt->init(ofile, report_error, define_label, evaluate);

            assemble_file(inname);

            if (!terminate_after_phase) {
                ofmt->cleanup(using_debug_info);
                cleanup_labels();
            } else {
                /*
                 * We had an fclose on the output file here, but we
                 * actually do that in all the object file drivers as well,
                 * so we're leaving out the one here.
                 *     fclose (ofile);
                 */
                remove(outname);
                if (listname[0])
                    remove(listname);
            }
        }
        break;
    }

    if (want_usage)
        usage();

    raa_free(offsets);
    saa_free(forwrefs);
    eval_cleanup();
    nasmlib_cleanup();

    if (terminate_after_phase)
        return 1;
    else
        return 0;
}

/*
 * Get a parameter for a command line option.
 * First arg must be in the form of e.g. -f...
 */
static char *get_param(char *p, char *q, int *advance)
{
    *advance = 0;
    if (p[2]) {                 /* the parameter's in the option */
        p += 2;
        while (isspace(*p))
            p++;
        return p;
    }
    if (q && q[0]) {
        *advance = 1;
        return q;
    }
    report_error(ERR_NONFATAL | ERR_NOFILE | ERR_USAGE,
                 "option `-%c' requires an argument", p[1]);
    return NULL;
}

struct textargs {
    const char *label;
    int value;
};