Release 4.10 scripts/genksyms/genksyms.c

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

   New implementation contributed by Richard Henderson <rth@tamu.edu>
   Based on original work by Bjorn Ekwall <bj0rn@blox.se>

   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, flag_rel_crcs;

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);
}

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

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

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



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;
}

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michal marek
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kai germaschewski
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45.45%
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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;
}

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kai germaschewski
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33.33%
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michal marek
18
18.00%
1
33.33%
andreas gruenbacher
andreas gruenbacher
4
4.00%
1
33.33%
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100
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3
100.00%



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);
}

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kai germaschewski
3
2.63%
1
50.00%
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114
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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;
}

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35.70%
3
37.50%
kai germaschewski
kai germaschewski
201
32.47%
1
12.50%
michal marek
michal marek
194
31.34%
2
25.00%
sam ravnborg
sam ravnborg
2
0.32%
1
12.50%
ladinu chandrasinghe
ladinu chandrasinghe
1
0.16%
1
12.50%
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619
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8
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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);
}

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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);
}

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50.00%
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ladinu chandrasinghe
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2.56%
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/*----------------------------------------------------------------------*/



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

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13.64%
1
50.00%
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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;
	}
}

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kai germaschewski
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50.00%
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sam ravnborg
1
2.44%
1
50.00%
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41
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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;
}

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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;
}

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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;
}

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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;
}

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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;
}

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2.99%
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#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, in_string = 0;

	while ((c = fgetc(f)) != EOF) {
		if (!in_string && c == ' ') {
			if (node.string == buffer)
				continue;
			break;
		} else if (c == '"') {
			in_string = !in_string;
		} 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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
andreas gruenbacher
andreas gruenbacher
250
90.25%
1
20.00%
michal marek
michal marek
25
9.03%
2
40.00%
jesper juhl
jesper juhl
1
0.36%
1
20.00%
ladinu chandrasinghe
ladinu chandrasinghe
1
0.36%
1
20.00%
Total
277
100.00%
5
100.00%



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);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
andreas gruenbacher
andreas gruenbacher
199
100.00%
2
100.00%
Total
199
100.00%
2
100.00%



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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
kai germaschewski
kai germaschewski
43
74.14%
1
33.33%
michal marek
michal marek
8
13.79%
1
33.33%
andreas gruenbacher
andreas gruenbacher
7
12.07%
1
33.33%
Total
58
100.00%
3
100.00%



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