genksyms.c

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/* Generate kernel symbol version hashes.
   Copyright 1996, 1997 Linux International.

   New implementation contributed by Richard Henderson <[email protected]>
   Based on original work by Bjorn Ekwall <[email protected]>

   This file was part of the Linux modutils 2.4.22: moved back into the
   kernel sources by Rusty Russell/Kai Germaschewski.

   This program 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 of the License, or (at your
   option) any later version.

   This program 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 this program; if not, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <assert.h>
#include <stdarg.h>
#ifdef __GNU_LIBRARY__
#include <getopt.h>
#endif              /* __GNU_LIBRARY__ */

#include "genksyms.h"
/*----------------------------------------------------------------------*/

#define HASH_BUCKETS  4096

static struct symbol *symtab[HASH_BUCKETS];
static FILE *debugfile;

int cur_line = 1;
char *cur_filename, *source_file;
int in_source_file;

static int flag_debug, flag_dump_defs, flag_reference, flag_dump_types,
       flag_preserve, flag_warnings;
static const char *arch = "";
static const char *mod_prefix = "";

static int errors;
static int nsyms;

static struct symbol *expansion_trail;
static struct symbol *visited_symbols;

static const struct {
    int n;
    const char *name;
} symbol_types[] = {
    [SYM_NORMAL]     = { 0, NULL},
    [SYM_TYPEDEF]    = {'t', "typedef"},
    [SYM_ENUM]       = {'e', "enum"},
    [SYM_STRUCT]     = {'s', "struct"},
    [SYM_UNION]      = {'u', "union"},
    [SYM_ENUM_CONST] = {'E', "enum constant"},
};

static int equal_list(struct string_list *a, struct string_list *b);
static void print_list(FILE * f, struct string_list *list);
static struct string_list *concat_list(struct string_list *start, ...);
static struct string_list *mk_node(const char *string);
static void print_location(void);
static void print_type_name(enum symbol_type type, const char *name);

/*----------------------------------------------------------------------*/

static const unsigned int crctab32[] = {
    0x00000000U, 0x77073096U, 0xee0e612cU, 0x990951baU, 0x076dc419U,
    0x706af48fU, 0xe963a535U, 0x9e6495a3U, 0x0edb8832U, 0x79dcb8a4U,
    0xe0d5e91eU, 0x97d2d988U, 0x09b64c2bU, 0x7eb17cbdU, 0xe7b82d07U,
    0x90bf1d91U, 0x1db71064U, 0x6ab020f2U, 0xf3b97148U, 0x84be41deU,
    0x1adad47dU, 0x6ddde4ebU, 0xf4d4b551U, 0x83d385c7U, 0x136c9856U,
    0x646ba8c0U, 0xfd62f97aU, 0x8a65c9ecU, 0x14015c4fU, 0x63066cd9U,
    0xfa0f3d63U, 0x8d080df5U, 0x3b6e20c8U, 0x4c69105eU, 0xd56041e4U,
    0xa2677172U, 0x3c03e4d1U, 0x4b04d447U, 0xd20d85fdU, 0xa50ab56bU,
    0x35b5a8faU, 0x42b2986cU, 0xdbbbc9d6U, 0xacbcf940U, 0x32d86ce3U,
    0x45df5c75U, 0xdcd60dcfU, 0xabd13d59U, 0x26d930acU, 0x51de003aU,
    0xc8d75180U, 0xbfd06116U, 0x21b4f4b5U, 0x56b3c423U, 0xcfba9599U,
    0xb8bda50fU, 0x2802b89eU, 0x5f058808U, 0xc60cd9b2U, 0xb10be924U,
    0x2f6f7c87U, 0x58684c11U, 0xc1611dabU, 0xb6662d3dU, 0x76dc4190U,
    0x01db7106U, 0x98d220bcU, 0xefd5102aU, 0x71b18589U, 0x06b6b51fU,
    0x9fbfe4a5U, 0xe8b8d433U, 0x7807c9a2U, 0x0f00f934U, 0x9609a88eU,
    0xe10e9818U, 0x7f6a0dbbU, 0x086d3d2dU, 0x91646c97U, 0xe6635c01U,
    0x6b6b51f4U, 0x1c6c6162U, 0x856530d8U, 0xf262004eU, 0x6c0695edU,
    0x1b01a57bU, 0x8208f4c1U, 0xf50fc457U, 0x65b0d9c6U, 0x12b7e950U,
    0x8bbeb8eaU, 0xfcb9887cU, 0x62dd1ddfU, 0x15da2d49U, 0x8cd37cf3U,
    0xfbd44c65U, 0x4db26158U, 0x3ab551ceU, 0xa3bc0074U, 0xd4bb30e2U,
    0x4adfa541U, 0x3dd895d7U, 0xa4d1c46dU, 0xd3d6f4fbU, 0x4369e96aU,
    0x346ed9fcU, 0xad678846U, 0xda60b8d0U, 0x44042d73U, 0x33031de5U,
    0xaa0a4c5fU, 0xdd0d7cc9U, 0x5005713cU, 0x270241aaU, 0xbe0b1010U,
    0xc90c2086U, 0x5768b525U, 0x206f85b3U, 0xb966d409U, 0xce61e49fU,
    0x5edef90eU, 0x29d9c998U, 0xb0d09822U, 0xc7d7a8b4U, 0x59b33d17U,
    0x2eb40d81U, 0xb7bd5c3bU, 0xc0ba6cadU, 0xedb88320U, 0x9abfb3b6U,
    0x03b6e20cU, 0x74b1d29aU, 0xead54739U, 0x9dd277afU, 0x04db2615U,
    0x73dc1683U, 0xe3630b12U, 0x94643b84U, 0x0d6d6a3eU, 0x7a6a5aa8U,
    0xe40ecf0bU, 0x9309ff9dU, 0x0a00ae27U, 0x7d079eb1U, 0xf00f9344U,
    0x8708a3d2U, 0x1e01f268U, 0x6906c2feU, 0xf762575dU, 0x806567cbU,
    0x196c3671U, 0x6e6b06e7U, 0xfed41b76U, 0x89d32be0U, 0x10da7a5aU,
    0x67dd4accU, 0xf9b9df6fU, 0x8ebeeff9U, 0x17b7be43U, 0x60b08ed5U,
    0xd6d6a3e8U, 0xa1d1937eU, 0x38d8c2c4U, 0x4fdff252U, 0xd1bb67f1U,
    0xa6bc5767U, 0x3fb506ddU, 0x48b2364bU, 0xd80d2bdaU, 0xaf0a1b4cU,
    0x36034af6U, 0x41047a60U, 0xdf60efc3U, 0xa867df55U, 0x316e8eefU,
    0x4669be79U, 0xcb61b38cU, 0xbc66831aU, 0x256fd2a0U, 0x5268e236U,
    0xcc0c7795U, 0xbb0b4703U, 0x220216b9U, 0x5505262fU, 0xc5ba3bbeU,
    0xb2bd0b28U, 0x2bb45a92U, 0x5cb36a04U, 0xc2d7ffa7U, 0xb5d0cf31U,
    0x2cd99e8bU, 0x5bdeae1dU, 0x9b64c2b0U, 0xec63f226U, 0x756aa39cU,
    0x026d930aU, 0x9c0906a9U, 0xeb0e363fU, 0x72076785U, 0x05005713U,
    0x95bf4a82U, 0xe2b87a14U, 0x7bb12baeU, 0x0cb61b38U, 0x92d28e9bU,
    0xe5d5be0dU, 0x7cdcefb7U, 0x0bdbdf21U, 0x86d3d2d4U, 0xf1d4e242U,
    0x68ddb3f8U, 0x1fda836eU, 0x81be16cdU, 0xf6b9265bU, 0x6fb077e1U,
    0x18b74777U, 0x88085ae6U, 0xff0f6a70U, 0x66063bcaU, 0x11010b5cU,
    0x8f659effU, 0xf862ae69U, 0x616bffd3U, 0x166ccf45U, 0xa00ae278U,
    0xd70dd2eeU, 0x4e048354U, 0x3903b3c2U, 0xa7672661U, 0xd06016f7U,
    0x4969474dU, 0x3e6e77dbU, 0xaed16a4aU, 0xd9d65adcU, 0x40df0b66U,
    0x37d83bf0U, 0xa9bcae53U, 0xdebb9ec5U, 0x47b2cf7fU, 0x30b5ffe9U,
    0xbdbdf21cU, 0xcabac28aU, 0x53b39330U, 0x24b4a3a6U, 0xbad03605U,
    0xcdd70693U, 0x54de5729U, 0x23d967bfU, 0xb3667a2eU, 0xc4614ab8U,
    0x5d681b02U, 0x2a6f2b94U, 0xb40bbe37U, 0xc30c8ea1U, 0x5a05df1bU,
    0x2d02ef8dU
};

static unsigned long partial_crc32_one(unsigned char c, unsigned long crc)
{
    return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8);
}

static unsigned long partial_crc32(const char *s, unsigned long crc)
{
    while (*s)
        crc = partial_crc32_one(*s++, crc);
    return crc;
}

static unsigned long crc32(const char *s)
{
    return partial_crc32(s, 0xffffffff) ^ 0xffffffff;
}

/*----------------------------------------------------------------------*/

static enum symbol_type map_to_ns(enum symbol_type t)
{
    switch (t) {
    case SYM_ENUM_CONST:
    case SYM_NORMAL:
    case SYM_TYPEDEF:
        return SYM_NORMAL;
    case SYM_ENUM:
    case SYM_STRUCT:
    case SYM_UNION:
        return SYM_STRUCT;
    }
    return t;
}

struct symbol *find_symbol(const char *name, enum symbol_type ns, int exact)
{
    unsigned long h = crc32(name) % HASH_BUCKETS;
    struct symbol *sym;

    for (sym = symtab[h]; sym; sym = sym->hash_next)
        if (map_to_ns(sym->type) == map_to_ns(ns) &&
            strcmp(name, sym->name) == 0 &&
            sym->is_declared)
            break;

    if (exact && sym && sym->type != ns)
        return NULL;
    return sym;
}

static int is_unknown_symbol(struct symbol *sym)
{
    struct string_list *defn;

    return ((sym->type == SYM_STRUCT ||
         sym->type == SYM_UNION ||
         sym->type == SYM_ENUM) &&
        (defn = sym->defn)  && defn->tag == SYM_NORMAL &&
            strcmp(defn->string, "}") == 0 &&
        (defn = defn->next) && defn->tag == SYM_NORMAL &&
            strcmp(defn->string, "UNKNOWN") == 0 &&
        (defn = defn->next) && defn->tag == SYM_NORMAL &&
            strcmp(defn->string, "{") == 0);
}

static struct symbol *__add_symbol(const char *name, enum symbol_type type,
                struct string_list *defn, int is_extern,
                int is_reference)
{
    unsigned long h;
    struct symbol *sym;
    enum symbol_status status = STATUS_UNCHANGED;
    /* The parser adds symbols in the order their declaration completes,
     * so it is safe to store the value of the previous enum constant in
     * a static variable.
     */
    static int enum_counter;
    static struct string_list *last_enum_expr;

    if (type == SYM_ENUM_CONST) {
        if (defn) {
            free_list(last_enum_expr, NULL);
            last_enum_expr = copy_list_range(defn, NULL);
            enum_counter = 1;
        } else {
            struct string_list *expr;
            char buf[20];

            snprintf(buf, sizeof(buf), "%d", enum_counter++);
            if (last_enum_expr) {
                expr = copy_list_range(last_enum_expr, NULL);
                defn = concat_list(mk_node("("),
                           expr,
                           mk_node(")"),
                           mk_node("+"),
                           mk_node(buf), NULL);
            } else {
                defn = mk_node(buf);
            }
        }
    } else if (type == SYM_ENUM) {
        free_list(last_enum_expr, NULL);
        last_enum_expr = NULL;
        enum_counter = 0;
        if (!name)
            /* Anonymous enum definition, nothing more to do */
            return NULL;
    }

    h = crc32(name) % HASH_BUCKETS;
    for (sym = symtab[h]; sym; sym = sym->hash_next) {
        if (map_to_ns(sym->type) == map_to_ns(type) &&
            strcmp(name, sym->name) == 0) {
            if (is_reference)
                /* fall through */ ;
            else if (sym->type == type &&
                 equal_list(sym->defn, defn)) {
                if (!sym->is_declared && sym->is_override) {
                    print_location();
                    print_type_name(type, name);
                    fprintf(stderr, " modversion is "
                        "unchanged\n");
                }
                sym->is_declared = 1;
                return sym;
            } else if (!sym->is_declared) {
                if (sym->is_override && flag_preserve) {
                    print_location();
                    fprintf(stderr, "ignoring ");
                    print_type_name(type, name);
                    fprintf(stderr, " modversion change\n");
                    sym->is_declared = 1;
                    return sym;
                } else {
                    status = is_unknown_symbol(sym) ?
                        STATUS_DEFINED : STATUS_MODIFIED;
                }
            } else {
                error_with_pos("redefinition of %s", name);
                return sym;
            }
            break;
        }
    }

    if (sym) {
        struct symbol **psym;

        for (psym = &symtab[h]; *psym; psym = &(*psym)->hash_next) {
            if (*psym == sym) {
                *psym = sym->hash_next;
                break;
            }
        }
        --nsyms;
    }

    sym = xmalloc(sizeof(*sym));
    sym->name = name;
    sym->type = type;
    sym->defn = defn;
    sym->expansion_trail = NULL;
    sym->visited = NULL;
    sym->is_extern = is_extern;

    sym->hash_next = symtab[h];
    symtab[h] = sym;

    sym->is_declared = !is_reference;
    sym->status = status;
    sym->is_override = 0;

    if (flag_debug) {
        if (symbol_types[type].name)
            fprintf(debugfile, "Defn for %s %s == <",
                symbol_types[type].name, name);
        else
            fprintf(debugfile, "Defn for type%d %s == <",
                type, name);
        if (is_extern)
            fputs("extern ", debugfile);
        print_list(debugfile, defn);
        fputs(">\n", debugfile);
    }

    ++nsyms;
    return sym;
}

struct symbol *add_symbol(const char *name, enum symbol_type type,
              struct string_list *defn, int is_extern)
{
    return __add_symbol(name, type, defn, is_extern, 0);
}

static struct symbol *add_reference_symbol(const char *name, enum symbol_type type,
                    struct string_list *defn, int is_extern)
{
    return __add_symbol(name, type, defn, is_extern, 1);
}

/*----------------------------------------------------------------------*/

void free_node(struct string_list *node)
{
    free(node->string);
    free(node);
}

void free_list(struct string_list *s, struct string_list *e)
{
    while (s != e) {
        struct string_list *next = s->next;
        free_node(s);
        s = next;
    }
}

static struct string_list *mk_node(const char *string)
{
    struct string_list *newnode;

    newnode = xmalloc(sizeof(*newnode));
    newnode->string = xstrdup(string);
    newnode->tag = SYM_NORMAL;
    newnode->next = NULL;

    return newnode;
}

static struct string_list *concat_list(struct string_list *start, ...)
{
    va_list ap;
    struct string_list *n, *n2;

    if (!start)
        return NULL;
    for (va_start(ap, start); (n = va_arg(ap, struct string_list *));) {
        for (n2 = n; n2->next; n2 = n2->next)
            ;
        n2->next = start;
        start = n;
    }
    va_end(ap);
    return start;
}

struct string_list *copy_node(struct string_list *node)
{
    struct string_list *newnode;

    newnode = xmalloc(sizeof(*newnode));
    newnode->string = xstrdup(node->string);
    newnode->tag = node->tag;

    return newnode;
}

struct string_list *copy_list_range(struct string_list *start,
                    struct string_list *end)
{
    struct string_list *res, *n;

    if (start == end)
        return NULL;
    n = res = copy_node(start);
    for (start = start->next; start != end; start = start->next) {
        n->next = copy_node(start);
        n = n->next;
    }
    n->next = NULL;
    return res;
}

static int equal_list(struct string_list *a, struct string_list *b)
{
    while (a && b) {
        if (a->tag != b->tag || strcmp(a->string, b->string))
            return 0;
        a = a->next;
        b = b->next;
    }

    return !a && !b;
}

#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))

static struct string_list *read_node(FILE *f)
{
    char buffer[256];
    struct string_list node = {
        .string = buffer,
        .tag = SYM_NORMAL };
    int c;

    while ((c = fgetc(f)) != EOF) {
        if (c == ' ') {
            if (node.string == buffer)
                continue;
            break;
        } else if (c == '\n') {
            if (node.string == buffer)
                return NULL;
            ungetc(c, f);
            break;
        }
        if (node.string >= buffer + sizeof(buffer) - 1) {
            fprintf(stderr, "Token too long\n");
            exit(1);
        }
        *node.string++ = c;
    }
    if (node.string == buffer)
        return NULL;
    *node.string = 0;
    node.string = buffer;

    if (node.string[1] == '#') {
        size_t n;

        for (n = 0; n < ARRAY_SIZE(symbol_types); n++) {
            if (node.string[0] == symbol_types[n].n) {
                node.tag = n;
                node.string += 2;
                return copy_node(&node);
            }
        }
        fprintf(stderr, "Unknown type %c\n", node.string[0]);
        exit(1);
    }
    return copy_node(&node);
}

static void read_reference(FILE *f)
{
    while (!feof(f)) {
        struct string_list *defn = NULL;
        struct string_list *sym, *def;
        int is_extern = 0, is_override = 0;
        struct symbol *subsym;

        sym = read_node(f);
        if (sym && sym->tag == SYM_NORMAL &&
            !strcmp(sym->string, "override")) {
            is_override = 1;
            free_node(sym);
            sym = read_node(f);
        }
        if (!sym)
            continue;
        def = read_node(f);
        if (def && def->tag == SYM_NORMAL &&
            !strcmp(def->string, "extern")) {
            is_extern = 1;
            free_node(def);
            def = read_node(f);
        }
        while (def) {
            def->next = defn;
            defn = def;
            def = read_node(f);
        }
        subsym = add_reference_symbol(xstrdup(sym->string), sym->tag,
                          defn, is_extern);
        subsym->is_override = is_override;
        free_node(sym);
    }
}

static void print_node(FILE * f, struct string_list *list)
{
    if (symbol_types[list->tag].n) {
        putc(symbol_types[list->tag].n, f);
        putc('#', f);
    }
    fputs(list->string, f);
}

static void print_list(FILE * f, struct string_list *list)
{
    struct string_list **e, **b;
    struct string_list *tmp, **tmp2;
    int elem = 1;

    if (list == NULL) {
        fputs("(nil)", f);
        return;
    }

    tmp = list;
    while ((tmp = tmp->next) != NULL)
        elem++;

    b = alloca(elem * sizeof(*e));
    e = b + elem;
    tmp2 = e - 1;

    (*tmp2--) = list;
    while ((list = list->next) != NULL)
        *(tmp2--) = list;

    while (b != e) {
        print_node(f, *b++);
        putc(' ', f);
    }
}

static unsigned long expand_and_crc_sym(struct symbol *sym, unsigned long crc)
{
    struct string_list *list = sym->defn;
    struct string_list **e, **b;
    struct string_list *tmp, **tmp2;
    int elem = 1;

    if (!list)
        return crc;

    tmp = list;
    while ((tmp = tmp->next) != NULL)
        elem++;

    b = alloca(elem * sizeof(*e));
    e = b + elem;
    tmp2 = e - 1;

    *(tmp2--) = list;
    while ((list = list->next) != NULL)
        *(tmp2--) = list;

    while (b != e) {
        struct string_list *cur;
        struct symbol *subsym;

        cur = *(b++);
        switch (cur->tag) {
        case SYM_NORMAL:
            if (flag_dump_defs)
                fprintf(debugfile, "%s ", cur->string);
            crc = partial_crc32(cur->string, crc);
            crc = partial_crc32_one(' ', crc);
            break;

        case SYM_ENUM_CONST:
        case SYM_TYPEDEF:
            subsym = find_symbol(cur->string, cur->tag, 0);
            /* FIXME: Bad reference files can segfault here. */
            if (subsym->expansion_trail) {
                if (flag_dump_defs)
                    fprintf(debugfile, "%s ", cur->string);
                crc = partial_crc32(cur->string, crc);
                crc = partial_crc32_one(' ', crc);
            } else {
                subsym->expansion_trail = expansion_trail;
                expansion_trail = subsym;
                crc = expand_and_crc_sym(subsym, crc);
            }
            break;

        case SYM_STRUCT:
        case SYM_UNION:
        case SYM_ENUM:
            subsym = find_symbol(cur->string, cur->tag, 0);
            if (!subsym) {
                struct string_list *n;

                error_with_pos("expand undefined %s %s",
                           symbol_types[cur->tag].name,
                           cur->string);
                n = concat_list(mk_node
                        (symbol_types[cur->tag].name),
                        mk_node(cur->string),
                        mk_node("{"),
                        mk_node("UNKNOWN"),
                        mk_node("}"), NULL);
                subsym =
                    add_symbol(cur->string, cur->tag, n, 0);
            }
            if (subsym->expansion_trail) {
                if (flag_dump_defs) {
                    fprintf(debugfile, "%s %s ",
                        symbol_types[cur->tag].name,
                        cur->string);
                }

                crc = partial_crc32(symbol_types[cur->tag].name,
                            crc);
                crc = partial_crc32_one(' ', crc);
                crc = partial_crc32(cur->string, crc);
                crc = partial_crc32_one(' ', crc);
            } else {
                subsym->expansion_trail = expansion_trail;
                expansion_trail = subsym;
                crc = expand_and_crc_sym(subsym, crc);
            }
            break;
        }
    }

    {
        static struct symbol **end = &visited_symbols;

        if (!sym->visited) {
            *end = sym;
            end = &sym->visited;
            sym->visited = (struct symbol *)-1L;
        }
    }

    return crc;
}

void export_symbol(const char *name)
{
    struct symbol *sym;

    sym = find_symbol(name, SYM_NORMAL, 0);
    if (!sym)
        error_with_pos("export undefined symbol %s", name);
    else {
        unsigned long crc;
        int has_changed = 0;

        if (flag_dump_defs)
            fprintf(debugfile, "Export %s == <", name);

        expansion_trail = (struct symbol *)-1L;

        sym->expansion_trail = expansion_trail;
        expansion_trail = sym;
        crc = expand_and_crc_sym(sym, 0xffffffff) ^ 0xffffffff;

        sym = expansion_trail;
        while (sym != (struct symbol *)-1L) {
            struct symbol *n = sym->expansion_trail;

            if (sym->status != STATUS_UNCHANGED) {
                if (!has_changed) {
                    print_location();
                    fprintf(stderr, "%s: %s: modversion "
                        "changed because of changes "
                        "in ", flag_preserve ? "error" :
                               "warning", name);
                } else
                    fprintf(stderr, ", ");
                print_type_name(sym->type, sym->name);
                if (sym->status == STATUS_DEFINED)
                    fprintf(stderr, " (became defined)");
                has_changed = 1;
                if (flag_preserve)
                    errors++;
            }
            sym->expansion_trail = 0;
            sym = n;
        }
        if (has_changed)
            fprintf(stderr, "\n");

        if (flag_dump_defs)
            fputs(">\n", debugfile);

        /* Used as a linker script. */
        printf("%s__crc_%s = 0x%08lx ;\n", mod_prefix, name, crc);
    }
}

/*----------------------------------------------------------------------*/

static void print_location(void)
{
    fprintf(stderr, "%s:%d: ", cur_filename ? : "<stdin>", cur_line);
}

static void print_type_name(enum symbol_type type, const char *name)
{
    if (symbol_types[type].name)
        fprintf(stderr, "%s %s", symbol_types[type].name, name);
    else
        fprintf(stderr, "%s", name);
}

void error_with_pos(const char *fmt, ...)
{
    va_list args;

    if (flag_warnings) {
        print_location();

        va_start(args, fmt);
        vfprintf(stderr, fmt, args);
        va_end(args);
        putc('\n', stderr);

        errors++;
    }
}

static void genksyms_usage(void)
{
    fputs("Usage:\n" "genksyms [-adDTwqhV] > /path/to/.tmp_obj.ver\n" "\n"
#ifdef __GNU_LIBRARY__
          "  -a, --arch            Select architecture\n"
          "  -d, --debug           Increment the debug level (repeatable)\n"
          "  -D, --dump            Dump expanded symbol defs (for debugging only)\n"
          "  -r, --reference file  Read reference symbols from a file\n"
          "  -T, --dump-types file Dump expanded types into file\n"
          "  -p, --preserve        Preserve reference modversions or fail\n"
          "  -w, --warnings        Enable warnings\n"
          "  -q, --quiet           Disable warnings (default)\n"
          "  -h, --help            Print this message\n"
          "  -V, --version         Print the release version\n"
#else               /* __GNU_LIBRARY__ */
          "  -a                    Select architecture\n"
          "  -d                    Increment the debug level (repeatable)\n"
          "  -D                    Dump expanded symbol defs (for debugging only)\n"
          "  -r file               Read reference symbols from a file\n"
          "  -T file               Dump expanded types into file\n"
          "  -p                    Preserve reference modversions or fail\n"
          "  -w                    Enable warnings\n"
          "  -q                    Disable warnings (default)\n"
          "  -h                    Print this message\n"
          "  -V                    Print the release version\n"
#endif              /* __GNU_LIBRARY__ */
          , stderr);
}

int main(int argc, char **argv)
{
    FILE *dumpfile = NULL, *ref_file = NULL;
    int o;

#ifdef __GNU_LIBRARY__
    struct option long_opts[] = {
        {"arch", 1, 0, 'a'},
        {"debug", 0, 0, 'd'},
        {"warnings", 0, 0, 'w'},
        {"quiet", 0, 0, 'q'},
        {"dump", 0, 0, 'D'},
        {"reference", 1, 0, 'r'},
        {"dump-types", 1, 0, 'T'},
        {"preserve", 0, 0, 'p'},
        {"version", 0, 0, 'V'},
        {"help", 0, 0, 'h'},
        {0, 0, 0, 0}
    };

    while ((o = getopt_long(argc, argv, "a:dwqVDr:T:ph",
                &long_opts[0], NULL)) != EOF)
#else               /* __GNU_LIBRARY__ */
    while ((o = getopt(argc, argv, "a:dwqVDr:T:ph")) != EOF)
#endif              /* __GNU_LIBRARY__ */
        switch (o) {
        case 'a':
            arch = optarg;
            break;
        case 'd':
            flag_debug++;
            break;
        case 'w':
            flag_warnings = 1;
            break;
        case 'q':
            flag_warnings = 0;
            break;
        case 'V':
            fputs("genksyms version 2.5.60\n", stderr);
            break;
        case 'D':
            flag_dump_defs = 1;
            break;
        case 'r':
            flag_reference = 1;
            ref_file = fopen(optarg, "r");
            if (!ref_file) {
                perror(optarg);
                return 1;
            }
            break;
        case 'T':
            flag_dump_types = 1;
            dumpfile = fopen(optarg, "w");
            if (!dumpfile) {
                perror(optarg);
                return 1;
            }
            break;
        case 'p':
            flag_preserve = 1;
            break;
        case 'h':
            genksyms_usage();
            return 0;
        default:
            genksyms_usage();
            return 1;
        }
    if ((strcmp(arch, "h8300") == 0) || (strcmp(arch, "blackfin") == 0))
        mod_prefix = "_";
    {
        extern int yydebug;
        extern int yy_flex_debug;

        yydebug = (flag_debug > 1);
        yy_flex_debug = (flag_debug > 2);

        debugfile = stderr;
        /* setlinebuf(debugfile); */
    }

    if (flag_reference) {
        read_reference(ref_file);
        fclose(ref_file);
    }

    yyparse();

    if (flag_dump_types && visited_symbols) {
        while (visited_symbols != (struct symbol *)-1L) {
            struct symbol *sym = visited_symbols;

            if (sym->is_override)
                fputs("override ", dumpfile);
            if (symbol_types[sym->type].n) {
                putc(symbol_types[sym->type].n, dumpfile);
                putc('#', dumpfile);
            }
            fputs(sym->name, dumpfile);
            putc(' ', dumpfile);
            if (sym->is_extern)
                fputs("extern ", dumpfile);
            print_list(dumpfile, sym->defn);
            putc('\n', dumpfile);

            visited_symbols = sym->visited;
            sym->visited = NULL;
        }
    }

    if (flag_debug) {
        fprintf(debugfile, "Hash table occupancy %d/%d = %g\n",
            nsyms, HASH_BUCKETS,
            (double)nsyms / (double)HASH_BUCKETS);
    }

    return errors != 0;
}