NASM 0.98p3.5

[nasm.git] / nasm.c

/* 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 "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 void report_error (int, char *, ...);
static void parse_cmdline (int, char **);
static void assemble_file (char *);
static int getkw (char *buf, char **value);
static void register_output_formats(void);
static void usage(void);

static int using_debug_info;

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;
static struct ofmt *ofmt = NULL;

static FILE *ofile = NULL;
static int sb = 16;                    /* by default */

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

static struct RAA *offsets;
static long abs_offset;

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

static Preproc *preproc;
static int preprocess_only;

/* used by error function to report location */

/*
 * 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, FALSE
};

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

/*
 * The explanations for the suppressible warnings. As before, entry
 * zero does nothing.
 */
static char *suppressed_what[1+ERR_WARN_MAX] = {
    NULL, "macro calls with wrong no. of params",
    "labels alone on lines without trailing `:'",
    "numeric constants greater than 0xFFFFFFFF"
};

/*
 * 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 (void);
static Preproc no_pp = {
    no_pp_reset,
    no_pp_getline,
    no_pp_cleanup
};

/*
 * get/set current offset...
 */
#define get_curr_ofs (in_abs_seg?abs_offset:\
                      raa_read(offsets,location.segment))
#define set_curr_ofs(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;

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

int main(int argc, char **argv) 
{
    want_usage = terminate_after_phase = FALSE;

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

    preproc = &nasmpp;
    preprocess_only = FALSE;

    seg_init();

    register_output_formats();

    parse_cmdline(argc, argv);

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

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

    if (preprocess_only) 
    {
        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;

        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();
        if (ofile)
            fclose(ofile);
        if (ofile && terminate_after_phase)
            remove(outname);
    } 
    else        /* NOT preprocess only */
    {
        /*
         * 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);
        }
    }

    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;
}

int stopoptions = 0;
static int process_arg (char *p, char *q)
{
    char *param;
    int  i, advance = 0;

    if (!p || !p[0])
        return 0;

    if (p[0]=='-' && ! stopoptions) 
    {
        switch (p[1]) {
          case '-':                     /* -- => stop processing options */
              stopoptions = 1;
              break;
          case 's':                    /* silently ignored for compatibility */
              break;
          case 'o':                    /* these parameters take values */
          case 'f':
          case 'p':
          case 'd':
          case 'i':
          case 'l':
          case 'F':
            if ( !(param = get_param (p, q, &advance)) )
                break;
            if (p[1]=='o') {           /* output file */
                strcpy (outname, param);
            } else if (p[1]=='f') {    /* output format */
                ofmt = ofmt_find(param);
                if (!ofmt) {
                    report_error (ERR_FATAL | ERR_NOFILE | ERR_USAGE,
                                  "unrecognised output format `%s' - "
                                  "use -hf for a list",
                                  param);
                }
                else
                    ofmt->current_dfmt = ofmt->debug_formats[0];
            } else if (p[1]=='p') {    /* pre-include */
                pp_pre_include (param);
            } else if (p[1]=='d') {    /* pre-define */
                pp_pre_define (param);
            } else if (p[1]=='i') {    /* include search path */
                pp_include_path (param);
            } else if (p[1]=='l') {    /* listing file */
                strcpy (listname, param);
            } else if (p[1] == 'F') {  /* specify debug format */
                ofmt->current_dfmt = dfmt_find(ofmt, param);
                if (!ofmt->current_dfmt) {
                    report_error (ERR_FATAL | ERR_NOFILE | ERR_USAGE,
                                  "unrecognized debug format `%s' for"
                                  " output format `%s'",
                                  param, ofmt->shortname);
                }
            }
            break;
          case 'g':
            using_debug_info = TRUE;
            break;
          case 'h':
            printf("usage: nasm [-@ response file] [-o outfile] [-f format] "
                   "[-l listfile]\n"
                   "            [options...] [--] filename\n");
            printf("    or nasm -r   for version info\n\n");
            printf("    -e          preprocess only (writes output to "
                   "stdout by default)\n"
                   "    -a          don't preprocess\n\n");
            printf("    -g          enable debug info\n"
                   "    -F format   select a debugging format\n\n");
            printf("    -i<path>    adds a pathname to the include file path\n"
                   "    -p<file>    pre-includes a file\n"
                   "    -d<macro>[=<value>] pre-defines a macro\n");
            printf("    -w+foo      enables warnings about foo; "
                   "-w-foo disables them\n  where foo can be:\n");
            for (i=1; i<=ERR_WARN_MAX; i++)
                printf("    %-16s%s (default %s)\n",
                       suppressed_names[i], suppressed_what[i],
                       suppressed[i] ? "off" : "on");
            printf ("\nresponse files should contain command line parameters"
                    ", one per line.\n");
            if (p[2] == 'f') {
                printf("\nvalid output formats for -f are"
                       " (`*' denotes default):\n");
                ofmt_list(ofmt, stdout);
            }
            else {
                printf ("\nFor a list of valid output formats, use -hf.\n");
                printf ("For a list of debug formats, use -f <form> -y.\n");
            }
            exit (0);                  /* never need usage message here */
            break;
          case 'y':
            printf("\nvalid debug formats for '%s' output format are"
                   " ('*' denotes default):\n",
                ofmt->shortname);
            dfmt_list(ofmt, stdout);
            exit(0);
            break;
          case 'r':
            printf("NASM version %s\n", NASM_VER);
#ifdef DEBUG
            printf("Compiled with -DDEBUG on " __DATE__ "\n");
#endif
            exit (0);                  /* never need usage message here */
            break;
          case 'e':                    /* preprocess only */
            preprocess_only = TRUE;
            break;
          case 'a':                    /* assemble only - don't preprocess */
            preproc = &no_pp;
            break;
          case 'w':
            if (p[2] != '+' && p[2] != '-') {
                report_error (ERR_NONFATAL | ERR_NOFILE | ERR_USAGE,
                              "invalid option to `-w'");
            } else {
                for (i=1; i<=ERR_WARN_MAX; i++)
                    if (!nasm_stricmp(p+3, suppressed_names[i]))
                        break;
                if (i <= ERR_WARN_MAX)
                    suppressed[i] = (p[2] == '-');
                else
                    report_error (ERR_NONFATAL | ERR_NOFILE | ERR_USAGE,
                                  "invalid option to `-w'");
            }
            break;
          default:
            if (!ofmt->setinfo(GI_SWITCH,&p))
                report_error (ERR_NONFATAL | ERR_NOFILE | ERR_USAGE,
                          "unrecognised option `-%c'",
                          p[1]);
            break;
        }
    } 
    else 
    {
        if (*inname) {
            report_error (ERR_NONFATAL | ERR_NOFILE | ERR_USAGE,
                          "more than one input file specified");
        } else
            strcpy(inname, p);
    }

    return advance;
}

#define ARG_BUF_DELTA 128

static void process_respfile (FILE *rfile)
{
    char *buffer, *p, *q, *prevarg;
    int bufsize, prevargsize;

    bufsize = prevargsize = ARG_BUF_DELTA;
    buffer = nasm_malloc(ARG_BUF_DELTA);
    prevarg = nasm_malloc(ARG_BUF_DELTA);
    prevarg[0] = '\0';

    while (1) {   /* Loop to handle all lines in file */

        p = buffer;
        while (1) {  /* Loop to handle long lines */
            q = fgets(p, bufsize-(p-buffer), rfile);
            if (!q)
                break;
            p += strlen(p);
            if (p > buffer && p[-1] == '\n')
                break;
            if (p-buffer > bufsize-10) {
                int offset;
                offset = p - buffer;
                bufsize += ARG_BUF_DELTA;
                buffer = nasm_realloc(buffer, bufsize);
                p = buffer + offset;
            }
        }

        if (!q && p == buffer) {
            if (prevarg[0])
                process_arg (prevarg, NULL);
            nasm_free (buffer);
            nasm_free (prevarg);
            return;
        }

        /*
         * Play safe: remove CRs, LFs and any spurious ^Zs, if any of
         * them are present at the end of the line.
         */
        *(p = &buffer[strcspn(buffer, "\r\n\032")]) = '\0';

        while (p > buffer && isspace(p[-1]))
            *--p = '\0';

        p = buffer;
        while (isspace(*p))
            p++;

        if (process_arg (prevarg, p))
            *p = '\0';

        if (strlen(p) > prevargsize-10) {
            prevargsize += ARG_BUF_DELTA;
            prevarg = nasm_realloc(prevarg, prevargsize);
        }
        strcpy (prevarg, p);
    }
}

static void parse_cmdline(int argc, char **argv)
{
    FILE *rfile;
    char *envreal, *envcopy=NULL, *p, *q, *arg, *prevarg;
    char separator = ' ';

    *inname = *outname = *listname = '\0';

    /*
     * First, process the NASM environment variable.
     */
    envreal = getenv("NASM");
    arg = NULL;
    if (envreal) {
        envcopy = nasm_strdup(envreal);
        p = envcopy;
        if (*p && *p != '-')
            separator = *p++;
        while (*p) {
            q = p;
            while (*p && *p != separator) p++;
            while (*p == separator) *p++ = '\0';
            prevarg = arg;
            arg = q;
            if (process_arg (prevarg, arg))
                arg = NULL;
        }
        if (arg)
            process_arg (arg, NULL);
        nasm_free (envcopy);
    }

    /*
     * Now process the actual command line.
     */
    while (--argc)
    {
        int i;
        argv++;
        if (!stopoptions && argv[0][0] == '-' && argv[0][1] == '@') {
            if ((p = get_param (argv[0], argc > 1 ? argv[1] : NULL, &i)))
                if ((rfile = fopen(p, "r"))) {
                    process_respfile (rfile);
                    fclose(rfile);
                } else
                    report_error (ERR_NONFATAL | ERR_NOFILE | ERR_USAGE,
                            "unable to open response file `%s'", p);
        } else
            i = process_arg (argv[0], argc > 1 ? argv[1] : NULL);
        argv += i, argc -= i;
    }

    if (!*inname)
        report_error (ERR_NONFATAL | ERR_NOFILE | ERR_USAGE,
                      "no input file specified");
}

static void assemble_file (char *fname)
{
    char   * value, * p, * q, * special, * line, debugid[80];
    insn   output_ins;
    int    i, rn_error, validid;
    long   seg, offs;
    struct tokenval tokval;
    expr   * e;

    /*
     * pass one 
     */
    pass = 1;
    in_abs_seg = FALSE;
    location.segment = ofmt->section(NULL, pass, &sb);
    preproc->reset(fname, 1, report_error, evaluate, &nasmlist);
    globallineno = 0;
    location.known = TRUE;
    location.offset = offs = get_curr_ofs;

    while ( (line = preproc->getline()) ) 
    {
        globallineno++;

        /* here we parse our directives; this is not handled by the 'real'
         * parser. */
        if ( (i = getkw (line, &value)) ) 
        {
            switch (i) {
              case 1:          /* [SEGMENT n] */
                seg = ofmt->section (value, pass, &sb);
                if (seg == NO_SEG) {
                    report_error (ERR_NONFATAL,
                                  "segment name `%s' not recognised",
                                  value);
                } else {
                    in_abs_seg = FALSE;
                    location.segment = seg;
                }
                break;
              case 2:          /* [EXTERN label:special] */
                if (*value == '$')
                    value++;           /* skip initial $ if present */
                q = value;
                validid = TRUE;
                if (!isidstart(*q))
                    validid = FALSE;
                while (*q && *q != ':') {
                    if (!isidchar(*q))
                        validid = FALSE;
                    q++;
                }
                if (!validid) {
                    report_error (ERR_NONFATAL,
                                  "identifier expected after EXTERN");
                    break;
                }
                if (*q == ':') {
                    *q++ = '\0';
                    special = q;
                } else
                    special = NULL;
                if (!is_extern(value)) {   /* allow re-EXTERN to be ignored */
                    declare_as_global (value, special, report_error);
                    define_label (value, seg_alloc(), 0L, NULL, FALSE, TRUE,
                                  ofmt, report_error);
                }
                break;
              case 3:          /* [BITS bits] */
                switch (atoi(value)) {
                  case 16:
                  case 32:
                    sb = atoi(value);
                    break;
                  default:
                    report_error(ERR_NONFATAL,
                                 "`%s' is not a valid argument to [BITS]",
                                 value);
                    break;
                }
                break;
              case 4:          /* [GLOBAL symbol:special] */
                if (*value == '$')
                    value++;           /* skip initial $ if present */
                q = value;
                validid = TRUE;
                if (!isidstart(*q))
                    validid = FALSE;
                while (*q && *q != ':') {
                    if (!isidchar(*q))
                        validid = FALSE;
                    q++;
                }
                if (!validid) {
                    report_error (ERR_NONFATAL,
                                  "identifier expected after GLOBAL");
                    break;
                }
                if (*q == ':') {
                    *q++ = '\0';
                    special = q;
                } else
                    special = NULL;
                declare_as_global (value, special, report_error);
                break;
              case 5:          /* [COMMON symbol size:special] */
                p = value;
                validid = TRUE;
                if (!isidstart(*p))
                    validid = FALSE;
                while (*p && !isspace(*p)) {
                    if (!isidchar(*p))
                        validid = FALSE;
                    p++;
                }
                if (!validid) {
                    report_error (ERR_NONFATAL,
                                  "identifier expected after COMMON");
                    break;
                }
                if (*p) {
                    long size;

                    while (*p && isspace(*p))
                        *p++ = '\0';
                    q = p;
                    while (*q && *q != ':')
                        q++;
                    if (*q == ':') {
                        *q++ = '\0';
                        special = q;
                    } else
                        special = NULL;
                    size = readnum (p, &rn_error);
                    if (rn_error)
                        report_error (ERR_NONFATAL, "invalid size specified"
                                      " in COMMON declaration");
                    else
                        define_common (value, seg_alloc(), size,
                                       special, ofmt, report_error);
                } else
                    report_error (ERR_NONFATAL, "no size specified in"
                                  " COMMON declaration");
                break;
              case 6:                  /* [ABSOLUTE address] */
                stdscan_reset();
                stdscan_bufptr = value;
                tokval.t_type = TOKEN_INVALID;
                e = evaluate(stdscan, NULL, &tokval, NULL, 1, report_error,
                             NULL);
                if (e) {
                    if (!is_reloc(e))
                        report_error (ERR_NONFATAL, "cannot use non-"
                                      "relocatable expression as ABSOLUTE"
                                      " address");
                    else {
                        abs_seg = reloc_seg(e);
                        abs_offset = reloc_value(e);
                    }
                } else
                    abs_offset = 0x100;/* don't go near zero in case of / */
                in_abs_seg = TRUE;
                location.segment = abs_seg;
                break;
              case 7:
                p = value;
                validid = TRUE;
                if (!isidstart(*p))
                    validid = FALSE;
                while (*p && !isspace(*p)) {
                    if (!isidchar(*p))
                        validid = FALSE;
                    p++;
                }
                if (!validid) {
                    report_error (ERR_NONFATAL,
                                  "identifier expected after DEBUG");
                    break;
                }
                while (*p && isspace(*p)) p++;
                break;
              default:
                if (!ofmt->directive (line+1, value, 1))
                    report_error (ERR_NONFATAL, "unrecognised directive [%s]",
                                  line+1);
                break;
            }
        }
        else    /* it isn't a directive */
        {
            parse_line (1, line, &output_ins,
                        report_error, evaluate, define_label);

            if (output_ins.forw_ref) 
            {
                for(i = 0; i < output_ins.operands; i++) 
                {
                    if (output_ins.oprs[i].opflags & OPFLAG_FORWARD) 
                    {
                        struct forwrefinfo *fwinf =
                            (struct forwrefinfo *)saa_wstruct(forwrefs);
                        fwinf->lineno = globallineno;
                        fwinf->operand = i;
                    }
                }
            }

            if (output_ins.opcode == I_EQU) 
            {
                /*
                 * Special `..' EQUs get processed in pass two,
                 * except `..@' macro-processor EQUs which are done
                 * in the normal place.
                 */
                if (!output_ins.label)
                    report_error (ERR_NONFATAL,
                                  "EQU not preceded by label");

                /* 
                 * EQU cannot be used to declare a label relative to
                 * an external symbol.
                 */
                else if ((output_ins.oprs[0].opflags & OPFLAG_EXTERN) 
                         || (output_ins.operands > 1 
                             && (output_ins.oprs[1].opflags & OPFLAG_EXTERN)))
                {
                    report_error (ERR_NONFATAL,
                                  "EQU used relative to external symbol");
                }

                else if (output_ins.label[0] != '.' ||
                         output_ins.label[1] != '.' ||
                         output_ins.label[2] == '@') 
                {
                    if (output_ins.operands == 1 &&
                        (output_ins.oprs[0].type & IMMEDIATE) &&
                        output_ins.oprs[0].wrt == NO_SEG) 
                    {
                        define_label (output_ins.label,
                                      output_ins.oprs[0].segment,
                                      output_ins.oprs[0].offset,
                                      NULL, FALSE, FALSE, ofmt, report_error);
                    } 
                    else if (output_ins.operands == 2 &&
                               (output_ins.oprs[0].type & IMMEDIATE) &&
                               (output_ins.oprs[0].type & COLON) &&
                               output_ins.oprs[0].segment == NO_SEG &&
                               output_ins.oprs[0].wrt == NO_SEG &&
                               (output_ins.oprs[1].type & IMMEDIATE) &&
                               output_ins.oprs[1].segment == NO_SEG &&
                               output_ins.oprs[1].wrt == NO_SEG) 
                    {
                        define_label (output_ins.label,
                                      output_ins.oprs[0].offset | SEG_ABS,
                                      output_ins.oprs[1].offset,
                                      NULL, FALSE, FALSE, ofmt, report_error);
                    } 
                    else
                        report_error(ERR_NONFATAL, "bad syntax for EQU");
                }
            } 
            else  /* instruction isn't an EQU */
            {
                long l = insn_size (location.segment, offs, sb,
                                   &output_ins, report_error);
                if (using_debug_info && output_ins.opcode != -1) {
                    /* this is done here so we can do debug type info */
                    long typeinfo = TYS_ELEMENTS(output_ins.operands);
                    switch (output_ins.opcode) {
                        case I_RESB:
                            typeinfo = TYS_ELEMENTS(output_ins.oprs[0].offset) | TY_BYTE;  
                            break;
                        case I_RESW:
                            typeinfo = TYS_ELEMENTS(output_ins.oprs[0].offset) | TY_WORD;  
                            break;
                        case I_RESD:
                            typeinfo = TYS_ELEMENTS(output_ins.oprs[0].offset) | TY_DWORD;  
                            break;
                        case I_RESQ:
                            typeinfo = TYS_ELEMENTS(output_ins.oprs[0].offset) | TY_QWORD;  
                            break;
                        case I_REST:
                            typeinfo = TYS_ELEMENTS(output_ins.oprs[0].offset) | TY_TBYTE;  
                            break;
                        case I_DB:
                            typeinfo |= TY_BYTE;
                            break;
                        case I_DW:
                            typeinfo |= TY_WORD;
                            break;
                        case I_DD:
                            if (output_ins.eops_float)
                                typeinfo |= TY_FLOAT;
                            else
                                typeinfo |= TY_DWORD;
                            break;
                        case I_DQ:
                            typeinfo |= TY_QWORD;
                            break;
                        case I_DT:
                            typeinfo |= TY_TBYTE;
                            break;
                        default:
                            typeinfo = TY_LABEL;
                    }
                    ofmt->current_dfmt->debug_typevalue(typeinfo);
                }
                if (l != -1) {
                    offs += l;
                    set_curr_ofs (offs);
                }
                /* 
                 * else l == -1 => invalid instruction, which will be
                 * flagged as an error on pass 2
                 */
            }
            cleanup_insn (&output_ins);
        }
        nasm_free (line);
        location.offset = offs = get_curr_ofs;
    }

    preproc->cleanup();

    if (terminate_after_phase) {
        fclose(ofile);
        remove(outname);
        if (want_usage)
            usage();
        exit (1);
    }

    /*
     * pass two 
     */

    pass = 2;
    saa_rewind (forwrefs);
    if (*listname)
        nasmlist.init(listname, report_error);
    forwref = saa_rstruct (forwrefs);
    in_abs_seg = FALSE;
    location.segment = ofmt->section(NULL, pass, &sb);
    raa_free (offsets);
    offsets = raa_init();
    preproc->reset(fname, 2, report_error, evaluate, &nasmlist);
    globallineno = 0;
    location.offset = offs = get_curr_ofs;

    while ( (line = preproc->getline()) ) 
    {
        globallineno++;

        /* here we parse our directives; this is not handled by
         * the 'real' parser. */
        if ( (i = getkw (line, &value)) ) {
            switch (i) {
              case 1:          /* [SEGMENT n] */
                seg = ofmt->section (value, pass, &sb);
                if (seg == NO_SEG) {
                    report_error (ERR_PANIC,
                                  "invalid segment name on pass two");
                } else
                    in_abs_seg = FALSE;
                    location.segment = seg;
                break;
              case 2:          /* [EXTERN label] */
                q = value;
                while (*q && *q != ':')
                    q++;
                if (*q == ':') {
                    *q++ = '\0';
                    ofmt->symdef(value, 0L, 0L, 3, q);
                }
                break;
              case 3:          /* [BITS bits] */
                switch (atoi(value)) {
                  case 16:
                  case 32:
                    sb = atoi(value);
                    break;
                  default:
                    report_error(ERR_PANIC,
                                 "invalid [BITS] value on pass two",
                                 value);
                    break;
                }
                break;
              case 4:                  /* [GLOBAL symbol] */
                q = value;
                while (*q && *q != ':')
                    q++;
                if (*q == ':') {
                    *q++ = '\0';
                    ofmt->symdef(value, 0L, 0L, 3, q);
                }
                break;
              case 5:                  /* [COMMON symbol size] */
                q = value;
                while (*q && *q != ':') {
                    if (isspace(*q))
                        *q = '\0';
                    q++;
                }
                if (*q == ':') {
                    *q++ = '\0';
                    ofmt->symdef(value, 0L, 0L, 3, q);
                }
                break;
              case 6:                  /* [ABSOLUTE addr] */
                stdscan_reset();
                stdscan_bufptr = value;
                tokval.t_type = TOKEN_INVALID;
                e = evaluate(stdscan, NULL, &tokval, NULL, 2, report_error,
                             NULL);
                if (e) {
                    if (!is_reloc(e))
                        report_error (ERR_PANIC, "non-reloc ABSOLUTE address"
                                      " in pass two");
                    else {
                        abs_seg = reloc_seg(e);
                        abs_offset = reloc_value(e);
                    }
                } else
                    report_error (ERR_PANIC, "invalid ABSOLUTE address "
                                  "in pass two");
                in_abs_seg = TRUE;
                location.segment = abs_seg;
                break;
              case 7:
                p = value;
                q = debugid;
                validid = TRUE;
                if (!isidstart(*p))
                    validid = FALSE;
                while (*p && !isspace(*p)) {
                    if (!isidchar(*p))
                        validid = FALSE;
                    *q++ = *p++;
                }
                *q++ = 0;
                if (!validid) {
                    report_error (ERR_PANIC,
                                  "identifier expected after DEBUG in pass 2");
                    break;
                }
                while (*p && isspace(*p)) 
                    p++;
                ofmt->current_dfmt->debug_directive (debugid, p);
                break;
              default:
                if (!ofmt->directive (line+1, value, 2))
                    report_error (ERR_PANIC, "invalid directive on pass two");
                break;
            }
        } 
        else            /* not a directive */
        {
            parse_line (2, line, &output_ins,
                        report_error, evaluate, redefine_label);
            if (forwref != NULL && globallineno == forwref->lineno) {
                output_ins.forw_ref = TRUE;
                do {
                    output_ins.oprs[forwref->operand].opflags|= OPFLAG_FORWARD;
                    forwref = saa_rstruct (forwrefs);
                } while (forwref != NULL && forwref->lineno == globallineno);
            } else
                output_ins.forw_ref = FALSE;

            /*
             * Hack to prevent phase error in the code
             *   rol ax,x
             *   x equ 1
             *
             * If the second operand is a forward reference,
             * the UNITY property of the number 1 in that
             * operand is cancelled. Otherwise the above
             * sequence will cause a phase error.
             *
             * This hack means that the above code will
             * generate 286+ code.
             *
             * The forward reference will mean that the
             * operand will not have the UNITY property on
             * the first pass, so the pass behaviours will
             * be consistent.
             */

            if (output_ins.forw_ref &&
                output_ins.operands >= 2 &&
                (output_ins.oprs[1].opflags & OPFLAG_FORWARD)) 
            {
                    output_ins.oprs[1].type &= ~ONENESS;
            }

            if (output_ins.opcode == I_EQU) 
            {
                /*
                 * Special `..' EQUs get processed here, except
                 * `..@' macro processor EQUs which are done above.
                 */
                if (output_ins.label[0] == '.' &&
                    output_ins.label[1] == '.' &&
                    output_ins.label[2] != '@') 
                {
                    if (output_ins.operands == 1 &&
                        (output_ins.oprs[0].type & IMMEDIATE)) {
                        define_label (output_ins.label,
                                      output_ins.oprs[0].segment,
                                      output_ins.oprs[0].offset,
                                      NULL, FALSE, FALSE, ofmt, report_error);
                    } 
                    else if (output_ins.operands == 2 &&
                               (output_ins.oprs[0].type & IMMEDIATE) &&
                               (output_ins.oprs[0].type & COLON) &&
                               output_ins.oprs[0].segment == NO_SEG &&
                               (output_ins.oprs[1].type & IMMEDIATE) &&
                               output_ins.oprs[1].segment == NO_SEG) 
                    {
                        define_label (output_ins.label,
                                      output_ins.oprs[0].offset | SEG_ABS,
                                      output_ins.oprs[1].offset,
                                      NULL, FALSE, FALSE, ofmt, report_error);
                    } 
                    else
                        report_error(ERR_NONFATAL, "bad syntax for EQU");
                }
            }
            offs += assemble (location.segment, offs, sb,
                              &output_ins, ofmt, report_error, &nasmlist);
            cleanup_insn (&output_ins);
            set_curr_ofs (offs);
        }

        nasm_free (line);

        location.offset = offs = get_curr_ofs;
    }

    preproc->cleanup();
    nasmlist.cleanup();
}

static int getkw (char *buf, char **value) 
{
    char *p, *q;

    if (*buf!='[')
        return 0;

    p = buf;

    while (*p && *p != ']') p++;

    if (!*p)
        return 0;

    q = p++;

    while (*p && *p != ';') {
        if (!isspace(*p))
            return 0;
        p++;
    }
    q[1] = '\0';

    p = buf+1;
    while (*buf && *buf!=' ' && *buf!=']' && *buf!='\t')
        buf++;
    if (*buf==']') {
        *buf = '\0';
        *value = buf;
    } else {
        *buf++ = '\0';
        while (isspace(*buf)) buf++;   /* beppu - skip leading whitespace */
        *value = buf;
        while (*buf!=']') buf++;
        *buf++ = '\0';
    }
    for (q=p; *q; q++)
        *q = tolower(*q);
    if (!strcmp(p, "segment") || !strcmp(p, "section"))
        return 1;
    if (!strcmp(p, "extern"))
        return 2;
    if (!strcmp(p, "bits"))
        return 3;
    if (!strcmp(p, "global"))
        return 4;
    if (!strcmp(p, "common"))
        return 5;
    if (!strcmp(p, "absolute"))
        return 6;
    if (!strcmp(p, "debug"))
        return 7;
    return -1;
}

static void report_error (int severity, char *fmt, ...) 
{
    va_list ap;

    /*
     * See if it's a suppressed warning.
     */
    if ((severity & ERR_MASK) == ERR_WARNING &&
        (severity & ERR_WARN_MASK) != 0 &&
        suppressed[ (severity & ERR_WARN_MASK) >> ERR_WARN_SHR ])
        return;                        /* and bail out if so */

    /*
     * See if it's a pass-one only warning and we're not in pass one.
     */
    if ((severity & ERR_PASS1) && pass != 1)
        return;

    if (severity & ERR_NOFILE)
        fputs ("nasm: ", stdout);
    else {
        char * currentfile = NULL;
        long lineno = 0;
        src_get (&lineno, &currentfile);
        fprintf (stdout, "%s:%ld: ", currentfile, lineno);
        nasm_free (currentfile);
    }

    if ( (severity & ERR_MASK) == ERR_WARNING)
        fputs ("warning: ", stdout);
    else if ( (severity & ERR_MASK) == ERR_PANIC)
        fputs ("panic: ", stdout);

    va_start (ap, fmt);
    vfprintf (stdout, fmt, ap);
    fputc ('\n', stdout);

    if (severity & ERR_USAGE)
        want_usage = TRUE;

    switch (severity & ERR_MASK) {
      case ERR_WARNING:
        /* no further action, by definition */
        break;
      case ERR_NONFATAL:
        terminate_after_phase = TRUE;
        break;
      case ERR_FATAL:
        if (ofile) {
            fclose(ofile);
            remove(outname);
        }
        if (want_usage)
            usage();
        exit(1);                       /* instantly die */
        break;                         /* placate silly compilers */
      case ERR_PANIC:
        abort();                       /* halt, catch fire, and dump core */
        break;
    }
}

static void usage(void) 
{
    fputs("type `nasm -h' for help\n", stdout);
}

static void register_output_formats(void) 
{
    ofmt = ofmt_register (report_error);
}

#define BUF_DELTA 512

static FILE *no_pp_fp;
static efunc no_pp_err;
static ListGen *no_pp_list;
static long no_pp_lineinc;

static void no_pp_reset (char *file, int pass, efunc error, evalfunc eval,
                         ListGen *listgen) 
{
    src_set_fname(nasm_strdup(file));
    src_set_linnum(0);
    no_pp_lineinc = 1;
    no_pp_err = error;
    no_pp_fp = fopen(file, "r");
    if (!no_pp_fp)
        no_pp_err (ERR_FATAL | ERR_NOFILE,
                   "unable to open input file `%s'", file);
    no_pp_list = listgen;
    (void) pass;                       /* placate compilers */
    (void) eval;                       /* placate compilers */
}

static char *no_pp_getline (void) 
{
    char *buffer, *p, *q;
    int bufsize;

    bufsize = BUF_DELTA;
    buffer = nasm_malloc(BUF_DELTA);
    src_set_linnum(src_get_linnum() + no_pp_lineinc);

    while (1) {   /* Loop to handle %line */

        p = buffer;
        while (1) {  /* Loop to handle long lines */
            q = fgets(p, bufsize-(p-buffer), no_pp_fp);
            if (!q)
                break;
            p += strlen(p);
            if (p > buffer && p[-1] == '\n')
                break;
            if (p-buffer > bufsize-10) {
                int offset;
                offset = p - buffer;
                bufsize += BUF_DELTA;
                buffer = nasm_realloc(buffer, bufsize);
                p = buffer + offset;
            }
        }

        if (!q && p == buffer) {
            nasm_free (buffer);
            return NULL;
        }

        /*
         * Play safe: remove CRs, LFs and any spurious ^Zs, if any of
         * them are present at the end of the line.
         */
        buffer[strcspn(buffer, "\r\n\032")] = '\0';

        if (!strncmp(buffer, "%line", 5)) {
            long ln;
            int  li;
            char *nm = nasm_malloc(strlen(buffer));
            if (sscanf(buffer+5, "%ld+%d %s", &ln, &li, nm) == 3) {
                nasm_free( src_set_fname(nm) );
                src_set_linnum(ln);
                no_pp_lineinc = li;
                continue;
            }
            nasm_free(nm);
        }
        break;
    }

    no_pp_list->line (LIST_READ, buffer);

    return buffer;
}

static void no_pp_cleanup (void) 
{
    fclose(no_pp_fp);
}