1 /* Generate code to allocate RTL structures. 2 Copyright (C) 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2007 3 Free Software Foundation, Inc. 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify it under 8 the terms of the GNU General Public License as published by the Free 9 Software Foundation; either version 3, or (at your option) any later 10 version. 11 12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 13 WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with GCC; see the file COPYING3. If not see 19 <http://www.gnu.org/licenses/>. */ 20 21 22 #include "bconfig.h" 23 #include "system.h" 24 25 struct rtx_definition 26 { 27 const char *const enumname, *const name, *const format; 28 }; 29 30 /* rtl.def needs CONST_DOUBLE_FORMAT, but we don't care what 31 CONST_DOUBLE_FORMAT is because we're not going to be generating 32 anything for CONST_DOUBLE anyway. */ 33 #define CONST_DOUBLE_FORMAT "" 34 35 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { #ENUM, NAME, FORMAT }, 36 37 static const struct rtx_definition defs[] = 38 { 39 #include "rtl.def" /* rtl expressions are documented here */ 40 }; 41 #define NUM_RTX_CODE ARRAY_SIZE(defs) 42 43 static const char *formats[NUM_RTX_CODE]; 44 45 static const char *type_from_format (int); 46 static const char *accessor_from_format (int); 47 static int special_format (const char *); 48 static int special_rtx (int); 49 static int excluded_rtx (int); 50 static void find_formats (void); 51 static void gendecl (const char *); 52 static void genmacro (int); 53 static void gendef (const char *); 54 static void genlegend (void); 55 static void genheader (void); 56 static void gencode (void); 57 58 /* Decode a format letter into a C type string. */ 59 60 static const char * 61 type_from_format (int c) 62 { 63 switch (c) 64 { 65 case 'i': 66 return "int "; 67 68 case 'w': 69 return "HOST_WIDE_INT "; 70 71 case 's': 72 return "const char *"; 73 74 case 'e': case 'u': 75 return "rtx "; 76 77 case 'E': 78 return "rtvec "; 79 case 'b': 80 return "struct bitmap_head_def *"; /* bitmap - typedef not available */ 81 case 't': 82 return "union tree_node *"; /* tree - typedef not available */ 83 case 'B': 84 return "struct basic_block_def *"; /* basic block - typedef not available */ 85 default: 86 gcc_unreachable (); 87 } 88 } 89 90 /* Decode a format letter into the proper accessor function. */ 91 92 static const char * 93 accessor_from_format (int c) 94 { 95 switch (c) 96 { 97 case 'i': 98 return "XINT"; 99 100 case 'w': 101 return "XWINT"; 102 103 case 's': 104 return "XSTR"; 105 106 case 'e': case 'u': 107 return "XEXP"; 108 109 case 'E': 110 return "XVEC"; 111 112 case 'b': 113 return "XBITMAP"; 114 115 case 't': 116 return "XTREE"; 117 118 case 'B': 119 return "XBBDEF"; 120 121 default: 122 gcc_unreachable (); 123 } 124 } 125 126 /* Return nonzero if we should ignore FMT, an RTL format, when making 127 the list of formats we write routines to create. */ 128 129 static int 130 special_format (const char *fmt) 131 { 132 return (strchr (fmt, '*') != 0 133 || strchr (fmt, 'V') != 0 134 || strchr (fmt, 'S') != 0 135 || strchr (fmt, 'n') != 0); 136 } 137 138 /* Return nonzero if the RTL code given by index IDX is one that we should 139 generate a gen_rtx_raw_FOO macro for, not gen_rtx_FOO (because gen_rtx_FOO 140 is a wrapper in emit-rtl.c). */ 141 142 static int 143 special_rtx (int idx) 144 { 145 return (strcmp (defs[idx].enumname, "CONST_INT") == 0 146 || strcmp (defs[idx].enumname, "REG") == 0 147 || strcmp (defs[idx].enumname, "SUBREG") == 0 148 || strcmp (defs[idx].enumname, "MEM") == 0 149 || strcmp (defs[idx].enumname, "CONST_VECTOR") == 0); 150 } 151 152 /* Return nonzero if the RTL code given by index IDX is one that we should 153 generate no macro for at all (because gen_rtx_FOO is never used or 154 cannot have the obvious interface). */ 155 156 static int 157 excluded_rtx (int idx) 158 { 159 return ((strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0) 160 || (strcmp (defs[idx].enumname, "CONST_FIXED") == 0)); 161 } 162 163 /* Place a list of all format specifiers we use into the array FORMAT. */ 164 165 static void 166 find_formats (void) 167 { 168 unsigned int i; 169 170 for (i = 0; i < NUM_RTX_CODE; i++) 171 { 172 const char **f; 173 174 if (special_format (defs[i].format)) 175 continue; 176 177 for (f = formats; *f; f++) 178 if (! strcmp (*f, defs[i].format)) 179 break; 180 181 if (*f == 0) 182 *f = defs[i].format; 183 } 184 } 185 186 /* Write the declarations for the routine to allocate RTL with FORMAT. */ 187 188 static void 189 gendecl (const char *format) 190 { 191 const char *p; 192 int i, pos; 193 194 printf ("extern rtx gen_rtx_fmt_%s_stat\t (RTX_CODE, ", format); 195 printf ("enum machine_mode mode"); 196 197 /* Write each parameter that is needed and start a new line when the line 198 would overflow. */ 199 for (p = format, i = 0, pos = 75; *p != 0; p++) 200 if (*p != '0') 201 { 202 int ourlen = strlen (type_from_format (*p)) + 6 + (i > 9); 203 204 printf (","); 205 if (pos + ourlen > 76) 206 printf ("\n\t\t\t\t "), pos = 39; 207 208 printf (" %sarg%d", type_from_format (*p), i++); 209 pos += ourlen; 210 } 211 printf (" MEM_STAT_DECL"); 212 213 printf (");\n"); 214 printf ("#define gen_rtx_fmt_%s(c, m", format); 215 for (p = format, i = 0; *p != 0; p++) 216 if (*p != '0') 217 printf (", p%i",i++); 218 printf (")\\\n gen_rtx_fmt_%s_stat (c, m", format); 219 for (p = format, i = 0; *p != 0; p++) 220 if (*p != '0') 221 printf (", p%i",i++); 222 printf (" MEM_STAT_INFO)\n\n"); 223 } 224 225 /* Generate macros to generate RTL of code IDX using the functions we 226 write. */ 227 228 static void 229 genmacro (int idx) 230 { 231 const char *p; 232 int i; 233 234 /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to 235 gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE. */ 236 237 if (excluded_rtx (idx)) 238 /* Don't define a macro for this code. */ 239 return; 240 241 printf ("#define gen_rtx_%s%s(MODE", 242 special_rtx (idx) ? "raw_" : "", defs[idx].enumname); 243 244 for (p = defs[idx].format, i = 0; *p != 0; p++) 245 if (*p != '0') 246 printf (", ARG%d", i++); 247 248 printf (") \\\n gen_rtx_fmt_%s (%s, (MODE)", 249 defs[idx].format, defs[idx].enumname); 250 251 for (p = defs[idx].format, i = 0; *p != 0; p++) 252 if (*p != '0') 253 printf (", (ARG%d)", i++); 254 255 puts (")"); 256 } 257 258 /* Generate the code for the function to generate RTL whose 259 format is FORMAT. */ 260 261 static void 262 gendef (const char *format) 263 { 264 const char *p; 265 int i, j; 266 267 /* Start by writing the definition of the function name and the types 268 of the arguments. */ 269 270 printf ("rtx\ngen_rtx_fmt_%s_stat (RTX_CODE code, enum machine_mode mode", format); 271 for (p = format, i = 0; *p != 0; p++) 272 if (*p != '0') 273 printf (",\n\t%sarg%d", type_from_format (*p), i++); 274 275 puts (" MEM_STAT_DECL)"); 276 277 /* Now write out the body of the function itself, which allocates 278 the memory and initializes it. */ 279 puts ("{"); 280 puts (" rtx rt;"); 281 puts (" rt = rtx_alloc_stat (code PASS_MEM_STAT);\n"); 282 283 puts (" PUT_MODE (rt, mode);"); 284 285 for (p = format, i = j = 0; *p ; ++p, ++i) 286 if (*p != '0') 287 printf (" %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++); 288 else 289 printf (" X0EXP (rt, %d) = NULL_RTX;\n", i); 290 291 puts ("\n return rt;\n}\n"); 292 } 293 294 /* Generate the documentation header for files we write. */ 295 296 static void 297 genlegend (void) 298 { 299 puts ("/* Generated automatically by gengenrtl from rtl.def. */\n"); 300 } 301 302 /* Generate the text of the header file we make, genrtl.h. */ 303 304 static void 305 genheader (void) 306 { 307 unsigned int i; 308 const char **fmt; 309 310 puts ("#ifndef GCC_GENRTL_H"); 311 puts ("#define GCC_GENRTL_H\n"); 312 puts ("#include \"statistics.h\"\n"); 313 314 for (fmt = formats; *fmt; ++fmt) 315 gendecl (*fmt); 316 317 putchar ('\n'); 318 319 for (i = 0; i < NUM_RTX_CODE; i++) 320 if (! special_format (defs[i].format)) 321 genmacro (i); 322 323 puts ("\n#endif /* GCC_GENRTL_H */"); 324 } 325 326 /* Generate the text of the code file we write, genrtl.c. */ 327 328 static void 329 gencode (void) 330 { 331 const char **fmt; 332 333 puts ("#include \"config.h\""); 334 puts ("#include \"system.h\""); 335 puts ("#include \"coretypes.h\""); 336 puts ("#include \"tm.h\""); 337 puts ("#include \"obstack.h\""); 338 puts ("#include \"rtl.h\""); 339 puts ("#include \"ggc.h\"\n"); 340 341 for (fmt = formats; *fmt != 0; fmt++) 342 gendef (*fmt); 343 } 344 345 /* This is the main program. We accept only one argument, "-h", which 346 says we are writing the genrtl.h file. Otherwise we are writing the 347 genrtl.c file. */ 348 349 int 350 main (int argc, char **argv) 351 { 352 find_formats (); 353 genlegend (); 354 355 if (argc == 2 && argv[1][0] == '-' && argv[1][1] == 'h') 356 genheader (); 357 else 358 gencode (); 359 360 if (ferror (stdout) || fflush (stdout) || fclose (stdout)) 361 return FATAL_EXIT_CODE; 362 363 return SUCCESS_EXIT_CODE; 364 } 365