cregit-Linux how code gets into the kernel

Release 4.15 scripts/genksyms/genksyms.c

Directory: scripts/genksyms
/* 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); }

Contributors

PersonTokensPropCommitsCommitProp
Kai Germaschewski33100.00%1100.00%
Total33100.00%1100.00%


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

Contributors

PersonTokensPropCommitsCommitProp
Kai Germaschewski35100.00%1100.00%
Total35100.00%1100.00%


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

Contributors

PersonTokensPropCommitsCommitProp
Kai Germaschewski22100.00%1100.00%
Total22100.00%1100.00%

/*----------------------------------------------------------------------*/
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; }

Contributors

PersonTokensPropCommitsCommitProp
Michal Marek2454.55%150.00%
Kai Germaschewski2045.45%150.00%
Total44100.00%2100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Kai Germaschewski7878.00%133.33%
Michal Marek1818.00%133.33%
Andreas Gruenbacher44.00%133.33%
Total100100.00%3100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Andreas Gruenbacher11197.37%150.00%
Kai Germaschewski32.63%150.00%
Total114100.00%2100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Andreas Gruenbacher22135.70%337.50%
Kai Germaschewski20132.47%112.50%
Michal Marek19431.34%225.00%
Sam Ravnborg20.32%112.50%
Ladinu Chandrasinghe10.16%112.50%
Total619100.00%8100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Andreas Gruenbacher38100.00%1100.00%
Total38100.00%1100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Andreas Gruenbacher3897.44%150.00%
Ladinu Chandrasinghe12.56%150.00%
Total39100.00%2100.00%

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

Contributors

PersonTokensPropCommitsCommitProp
Kai Germaschewski22100.00%1100.00%
Total22100.00%1100.00%


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; } }

Contributors

PersonTokensPropCommitsCommitProp
Andreas Gruenbacher3073.17%133.33%
Kai Germaschewski1024.39%133.33%
Sam Ravnborg12.44%133.33%
Total41100.00%3100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Michal Marek53100.00%1100.00%
Total53100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Michal Marek94100.00%1100.00%
Total94100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Andreas Gruenbacher50100.00%1100.00%
Total50100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Michal Marek87100.00%1100.00%
Total87100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Andreas Gruenbacher67100.00%1100.00%
Total67100.00%1100.00%

#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

PersonTokensPropCommitsCommitProp
Andreas Gruenbacher25090.25%120.00%
Michal Marek259.03%240.00%
Ladinu Chandrasinghe10.36%120.00%
Jesper Juhl10.36%120.00%
Total277100.00%5100.00%


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

PersonTokensPropCommitsCommitProp
Andreas Gruenbacher15477.39%266.67%
Kai Germaschewski4522.61%133.33%
Total199100.00%3100.00%


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

PersonTokensPropCommitsCommitProp
Kai Germaschewski4374.14%133.33%
Michal Marek813.79%133.33%
Andreas Gruenbacher712.07%133.33%
Total58100.00%3100.00%


static void print_list(FILE * f, struct string_list *list) { struct string_list **e, **b; struct string_list *tmp,