mono/mini/genmdesc.c

   1 /**
   2  * \file
   3  * Generates the machine description
   4  *
   5  * Authors:
   6  *   Paolo Molaro (lupus@ximian.com)
   7  *
   8  * (C) 2003 Ximian, Inc.
   9  */
  10 #include "mini.h"
  11 #include <ctype.h>
  12 #include <string.h>
  13 #include <mono/metadata/opcodes.h>
  14
  15 #define MINI_OP(a,b,dest,src1,src2) b,
  16 #define MINI_OP3(a,b,dest,src1,src2,src3) b,
  17 /* keep in sync with the enum in mini.h */
  18 static const char* const
  19 opnames[] = {
  20 #include "mini-ops.h"
  21 };
  22 #undef MINI_OP
  23 #undef MINI_OP3
  24
  25 /*
  26  * Duplicate this from helpers.c, so the opcode name array can be omitted when
  27  * DISABLE_JIT is set.
  28  */
  29 static const char*
  30 inst_name (int op) {
  31         if (op >= OP_LOAD && op <= OP_LAST)
  32                 return opnames [op - OP_LOAD];
  33         if (op < OP_LOAD)
  34                 return mono_opcode_name (op);
  35         g_error ("unknown opcode name for %d", op);
  36         return NULL;
  37 }
  38
  39 typedef struct {
  40         int num;
  41         const char *name;
  42         char *desc;
  43         char *comment;
  44         char spec [MONO_INST_MAX];
  45 } OpDesc;
  46
  47 static int nacl = 0;
  48 static GHashTable *table;
  49 static GHashTable *template_table;
  50
  51 #define eat_whitespace(s) while (*(s) && isspace (*(s))) s++;
  52
  53 // Per spec isalnum() expects input in the range 0-255
  54 // and can misbehave if you pass in a signed char.
  55 static int
  56 isalnum_char(char c)
  57 {
  58         return isalnum ((unsigned char)c);
  59 }
  60
  61 static int
  62 load_file (const char *name) {
  63         FILE *f;
  64         char buf [256];
  65         char *str, *p;
  66         int line;
  67         OpDesc *desc;
  68         GString *comment;
  69
  70         if (!(f = fopen (name, "r")))
  71                 g_error ("Cannot open file '%s'", name);
  72
  73         comment = g_string_new ("");
  74         /*
  75          * The format of the lines are:
  76          * # comment
  77          * opcode: [dest:format] [src1:format] [src2:format] [flags:format] [clob:format]
  78          *      [cost:num] [res:format] [delay:num] [len:num] [nacl:num]
  79          * format is a single letter that depends on the field
  80          * NOTE: no space between the field name and the ':'
  81          *
  82          * len: maximum instruction length
  83          */
  84         line = 0;
  85         while ((str = fgets (buf, sizeof (buf), f))) {
  86                 gboolean is_template = FALSE;
  87                 gboolean nacl_length_set = FALSE;
  88
  89                 ++line;
  90                 eat_whitespace (str);
  91                 if (!str [0])
  92                         continue;
  93                 if (str [0] == '#') {
  94                         g_string_append (comment, str);
  95                         continue;
  96                 }
  97                 p = strchr (str, '#');
  98                 if (p)
  99                         *p = 0;
 100                 p = strchr (str, ':');
 101                 if (!p)
 102                         g_error ("Invalid format at line %d in %s\n", line, name);
 103                 *p++ = 0;
 104                 eat_whitespace (p);
 105                 if (strcmp (str, "template") == 0) {
 106                         is_template = TRUE;
 107                         desc = g_new0 (OpDesc, 1);
 108                 } else {
 109                         desc = (OpDesc *)g_hash_table_lookup (table, str);
 110                         if (!desc)
 111                                 g_error ("Invalid opcode '%s' at line %d in %s\n", str, line, name);
 112                         if (desc->desc)
 113                                 g_error ("Duplicated opcode %s at line %d in %s\n", str, line, name);
 114                 }
 115                 desc->desc = g_strdup (p);
 116                 desc->comment = g_strdup (comment->str);
 117                 g_string_truncate (comment, 0);
 118                 while (*p) {
 119                         if (strncmp (p, "dest:", 5) == 0) {
 120                                 desc->spec [MONO_INST_DEST] = p [5];
 121                                 p += 6;
 122                         } else if (strncmp (p, "src1:", 5) == 0) {
 123                                 desc->spec [MONO_INST_SRC1] = p [5];
 124                                 p += 6;
 125                         } else if (strncmp (p, "src2:", 5) == 0) {
 126                                 desc->spec [MONO_INST_SRC2] = p [5];
 127                                 p += 6;
 128                         } else if (strncmp (p, "src3:", 5) == 0) {
 129                                 desc->spec [MONO_INST_SRC3] = p [5];
 130                                 p += 6;
 131                         } else if (strncmp (p, "clob:", 5) == 0) {
 132                                 desc->spec [MONO_INST_CLOB] = p [5];
 133                                 p += 6;
 134                                 /* Currently unused fields
 135                         } else if (strncmp (p, "cost:", 5) == 0) {
 136                                 desc->spec [MONO_INST_COST] = p [5];
 137                                 p += 6;
 138                         } else if (strncmp (p, "res:", 4) == 0) {
 139                                 desc->spec [MONO_INST_RES] = p [4];
 140                                 p += 5;
 141                         } else if (strncmp (p, "flags:", 6) == 0) {
 142                                 desc->spec [MONO_INST_FLAGS] = p [6];
 143                                 p += 7;
 144                         } else if (strncmp (p, "delay:", 6) == 0) {
 145                                 desc->spec [MONO_INST_DELAY] = p [6];
 146                                 p += 7;
 147                                 */
 148                         } else if (strncmp (p, "len:", 4) == 0) {
 149                                 unsigned long size;
 150                                 char* endptr;
 151                                 p += 4;
 152                                 size = strtoul (p, &endptr, 10);
 153                                 if (size == 0 && p == endptr)
 154                                         g_error ("Invalid length '%s' at line %d in %s\n", p, line, name);
 155                                 p = endptr;
 156                                 if (!nacl_length_set) {
 157                                         desc->spec [MONO_INST_LEN] = size;
 158                                 }
 159                         } else if (strncmp (p, "nacl:", 5) == 0) {
 160                                 unsigned long size;
 161                                 p += 5;
 162                                 size = strtoul (p, &p, 10);
 163                                 if (nacl) {
 164                                         desc->spec [MONO_INST_LEN] = size;
 165                                         nacl_length_set = TRUE;
 166                                 }
 167                         } else if (strncmp (p, "template:", 9) == 0) {
 168                                 char *tname;
 169                                 int i;
 170                                 OpDesc *tdesc;
 171                                 p += 9;
 172                                 tname = p;
 173                                 while (*p && isalnum_char (*p)) ++p;
 174                                 *p++ = 0;
 175                                 tdesc = (OpDesc *)g_hash_table_lookup (template_table, tname);
 176                                 if (!tdesc)
 177                                         g_error ("Invalid template name %s at '%s' at line %d in %s\n", tname, p, line, name);
 178                                 for (i = 0; i < MONO_INST_MAX; ++i) {
 179                                         if (desc->spec [i])
 180                                                 g_error ("The template overrides any previous value set at line %d in %s\n", line, name);
 181                                 }
 182                                 memcpy (desc->spec, tdesc->spec, sizeof (desc->spec));
 183                         } else if (strncmp (p, "name:", 5) == 0) {
 184                                 char *tname;
 185                                 if (!is_template)
 186                                         g_error ("name tag only valid in templates at '%s' at line %d in %s\n", p, line, name);
 187                                 if (desc->name)
 188                                         g_error ("Duplicated name tag in template %s at '%s' at line %d in %s\n", desc->name, p, line, name);
 189                                 p += 5;
 190                                 tname = p;
 191                                 while (*p && isalnum_char (*p)) ++p;
 192                                 *p++ = 0;
 193                                 if (g_hash_table_lookup (template_table, tname))
 194                                         g_error ("Duplicated template %s at line %d in %s\n", tname, line, name);
 195                                 desc->name = g_strdup (tname);
 196                                 g_hash_table_insert (template_table, (void*)desc->name, desc);
 197                         } else {
 198                                 g_error ("Parse error at '%s' at line %d in %s\n", p, line, name);
 199                         }
 200                         eat_whitespace (p);
 201                 }
 202                 if (is_template && !desc->name)
 203                         g_error ("Template without name at line %d in %s\n", line, name);
 204         }
 205         g_string_free (comment,TRUE);
 206         fclose (f);
 207         return 0;
 208 }
 209
 210 static OpDesc *opcodes = NULL;
 211
 212 static void
 213 init_table (void) {
 214         int i;
 215         OpDesc *desc;
 216
 217         template_table = g_hash_table_new (g_str_hash, g_str_equal);
 218         table = g_hash_table_new (g_str_hash, g_str_equal);
 219
 220         opcodes = g_new0 (OpDesc, OP_LAST);
 221         for (i = OP_LOAD; i < OP_LAST; ++i) {
 222                 desc = opcodes + i;
 223                 desc->num = i;
 224                 desc->name = inst_name (i);
 225                 g_hash_table_insert (table, (char *)desc->name, desc);
 226         }
 227 }
 228
 229 static void
 230 output_char (FILE *f, char c) {
 231         if (isalnum_char (c))
 232                 fprintf (f, "%c", c);
 233         else
 234                 fprintf (f, "\\x%x\" \"", (guint8)c);
 235 }
 236
 237 static void
 238 build_table (const char *fname, const char *name) {
 239         FILE *f;
 240         int i, j, idx;
 241         OpDesc *desc;
 242         GString *idx_array =  g_string_new ("");
 243         /* use this to remove duplicates */
 244         GHashTable *desc_ht = g_hash_table_new (g_str_hash, g_str_equal);
 245
 246         if (!(f = fopen (fname, "w")))
 247                 g_error ("Cannot open file '%s'", fname);
 248         fprintf (f, "/* File automatically generated by genmdesc, don't change */\n\n");
 249         fprintf (f, "const char mono_%s [] = {\n", name);
 250         fprintf (f, "\t\"");
 251         for (j = 0; j < MONO_INST_MAX; ++j)
 252                 fprintf (f, "\\x0");
 253         fprintf (f, "\"\t/* null entry */\n");
 254         idx = 1;
 255         g_string_append_printf (idx_array, "const guint16 mono_%s_idx [] = {\n", name);
 256
 257         for (i = OP_LOAD; i < OP_LAST; ++i) {
 258                 desc = opcodes + i;
 259                 if (!desc->desc)
 260                         g_string_append_printf (idx_array, "\t0,\t/* %s */\n", desc->name ? desc->name : "");
 261                 else {
 262                         fprintf (f, "\t\"");
 263                         for (j = 0; j < MONO_INST_MAX; ++j)
 264                                 output_char (f, desc->spec [j]);
 265                         fprintf (f, "\"\t/* %s */\n", desc->name);
 266                         g_string_append_printf (idx_array, "\t%d,\t/* %s */\n", idx * MONO_INST_MAX, desc->name);
 267                         ++idx;
 268                 }
 269         }
 270         fprintf (f, "};\n\n");
 271         fprintf (f, "%s};\n\n", idx_array->str);
 272         fclose (f);
 273         g_string_free (idx_array, TRUE);
 274         g_hash_table_destroy (desc_ht);
 275 }
 276
 277 static void
 278 dump (void) {
 279         int i;
 280         OpDesc *desc;
 281
 282         for (i = 0; i < MONO_CEE_LAST; ++i) {
 283                 desc = opcodes + i;
 284                 if (desc->comment)
 285                         g_print ("%s", desc->comment);
 286                 if (!desc->desc)
 287                         g_print ("%s:\n", desc->name);
 288                 else {
 289                         g_print ("%s: %s", desc->name, desc->desc);
 290                         if (!strchr (desc->desc, '\n'))
 291                                 g_print ("\n");
 292                 }
 293         }
 294         for (i = OP_LOAD; i < OP_LAST; ++i) {
 295                 desc = opcodes + i;
 296                 if (!desc->desc)
 297                         g_print ("%s:\n", desc->name);
 298                 else {
 299                         g_print ("%s: %s", desc->name, desc->desc);
 300                         if (!strchr (desc->desc, '\n'))
 301                                 g_print ("\n");
 302                 }
 303         }
 304 }
 305
 306 /*
 307  * TODO: output the table (possibly merged), in the input format
 308  */
 309 int
 310 main (int argc, char* argv [])
 311 {
 312         init_table ();
 313         if (argc == 2) {
 314                 /* useful to get a new file when some opcodes are added: looses the comments, though */
 315                 load_file (argv [1]);
 316                 dump ();
 317         } else if (argc < 4) {
 318                 g_print ("Usage: genmdesc arguments\n");
 319                 g_print ("\tgenmdesc desc     Output to stdout the description file.\n");
 320                 g_print ("\tgenmdesc [--nacl] output name desc [desc1...]\n"
 321                         "                     Write to output the description in a table named 'name',\n"
 322                         "                     use --nacl to generate Google NativeClient code\n");
 323                 return 1;
 324         } else {
 325                 int i = 3;
 326                 if (strcmp (argv [1], "--nacl") == 0) {
 327                         nacl = 1;
 328                         i++;
 329                 }
 330
 331                 for (; i < argc; ++i)
 332                         load_file (argv [i]);
 333
 334                 build_table (argv [1 + nacl], argv [2 + nacl]);
 335         }
 336         return 0;
 337 }
 338