1 /* Generate code to allocate RTL structures. 2 Copyright (C) 1997-2018 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify it under 7 the terms of the GNU General Public License as published by the Free 8 Software Foundation; either version 3, or (at your option) any later 9 version. 10 11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GCC; see the file COPYING3. If not see 18 <http://www.gnu.org/licenses/>. */ 19 20 21 #include "bconfig.h" 22 #include "system.h" 23 24 struct rtx_definition 25 { 26 const char *const enumname, *const name, *const format; 27 }; 28 29 /* rtl.def needs CONST_DOUBLE_FORMAT, but we don't care what 30 CONST_DOUBLE_FORMAT is because we're not going to be generating 31 anything for CONST_DOUBLE anyway. */ 32 #define CONST_DOUBLE_FORMAT "" 33 34 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { #ENUM, NAME, FORMAT }, 35 36 static const struct rtx_definition defs[] = 37 { 38 #include "rtl.def" /* rtl expressions are documented here */ 39 }; 40 #define NUM_RTX_CODE ARRAY_SIZE (defs) 41 42 static const char *formats[NUM_RTX_CODE]; 43 44 /* Decode a format letter into a C type string. */ 45 46 static const char * 47 type_from_format (int c) 48 { 49 switch (c) 50 { 51 case 'i': 52 return "int "; 53 54 case 'w': 55 return "HOST_WIDE_INT "; 56 57 case 'p': 58 return "poly_uint16 "; 59 60 case 's': 61 return "const char *"; 62 63 case 'e': case 'u': 64 return "rtx "; 65 66 case 'E': 67 return "rtvec "; 68 case 't': 69 return "tree "; 70 case 'B': 71 return "basic_block "; 72 default: 73 gcc_unreachable (); 74 } 75 } 76 77 /* Decode a format letter into the proper accessor function. */ 78 79 static const char * 80 accessor_from_format (int c) 81 { 82 switch (c) 83 { 84 case 'i': 85 return "XINT"; 86 87 case 'w': 88 return "XWINT"; 89 90 case 's': 91 return "XSTR"; 92 93 case 'e': case 'u': 94 return "XEXP"; 95 96 case 'E': 97 return "XVEC"; 98 99 case 't': 100 return "XTREE"; 101 102 case 'B': 103 return "XBBDEF"; 104 105 default: 106 gcc_unreachable (); 107 } 108 } 109 110 /* Return nonzero if we should ignore FMT, an RTL format, when making 111 the list of formats we write routines to create. */ 112 113 static int 114 special_format (const char *fmt) 115 { 116 return (strchr (fmt, '*') != 0 117 || strchr (fmt, 'V') != 0 118 || strchr (fmt, 'S') != 0 119 || strchr (fmt, 'n') != 0 120 || strchr (fmt, 'r') != 0); 121 } 122 123 /* Return true if CODE always has VOIDmode. */ 124 125 static inline bool 126 always_void_p (int idx) 127 { 128 return strcmp (defs[idx].enumname, "SET") == 0; 129 } 130 131 /* Return nonzero if the RTL code given by index IDX is one that we should 132 generate a gen_rtx_raw_FOO macro for, not gen_rtx_FOO (because gen_rtx_FOO 133 is a wrapper in emit-rtl.c). */ 134 135 static int 136 special_rtx (int idx) 137 { 138 return (strcmp (defs[idx].enumname, "EXPR_LIST") == 0 139 || strcmp (defs[idx].enumname, "INSN_LIST") == 0 140 || strcmp (defs[idx].enumname, "INSN") == 0 141 || strcmp (defs[idx].enumname, "CONST_INT") == 0 142 || strcmp (defs[idx].enumname, "REG") == 0 143 || strcmp (defs[idx].enumname, "SUBREG") == 0 144 || strcmp (defs[idx].enumname, "MEM") == 0 145 || strcmp (defs[idx].enumname, "PC") == 0 146 || strcmp (defs[idx].enumname, "CC0") == 0 147 || strcmp (defs[idx].enumname, "RETURN") == 0 148 || strcmp (defs[idx].enumname, "SIMPLE_RETURN") == 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, "VAR_LOCATION") == 0 160 || strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0 161 || strcmp (defs[idx].enumname, "CONST_WIDE_INT") == 0 162 || strcmp (defs[idx].enumname, "CONST_POLY_INT") == 0 163 || strcmp (defs[idx].enumname, "CONST_FIXED") == 0); 164 } 165 166 /* Place a list of all format specifiers we use into the array FORMAT. */ 167 168 static void 169 find_formats (void) 170 { 171 unsigned int i; 172 173 for (i = 0; i < NUM_RTX_CODE; i++) 174 { 175 const char **f; 176 177 if (special_format (defs[i].format)) 178 continue; 179 180 for (f = formats; *f; f++) 181 if (! strcmp (*f, defs[i].format)) 182 break; 183 184 if (*f == 0) 185 *f = defs[i].format; 186 } 187 } 188 189 190 /* Generate macros to generate RTL of code IDX using the functions we 191 write. */ 192 193 static void 194 genmacro (int idx) 195 { 196 const char *p; 197 const char *sep = ""; 198 int i; 199 200 /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to 201 gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE. */ 202 203 if (excluded_rtx (idx)) 204 /* Don't define a macro for this code. */ 205 return; 206 207 bool has_mode_p = !always_void_p (idx); 208 printf ("#define gen_rtx_%s%s(", 209 special_rtx (idx) ? "raw_" : "", defs[idx].enumname); 210 if (has_mode_p) 211 { 212 printf ("MODE"); 213 sep = ", "; 214 } 215 216 for (p = defs[idx].format, i = 0; *p != 0; p++) 217 if (*p != '0') 218 { 219 printf ("%sARG%d", sep, i++); 220 sep = ", "; 221 } 222 223 printf (") \\\n gen_rtx_fmt_%s (%s, %s", 224 defs[idx].format, defs[idx].enumname, 225 has_mode_p ? "(MODE)" : "VOIDmode"); 226 227 for (p = defs[idx].format, i = 0; *p != 0; p++) 228 if (*p != '0') 229 printf (", (ARG%d)", i++); 230 231 puts (")"); 232 } 233 234 /* Generate the code for the function to generate RTL whose 235 format is FORMAT. */ 236 237 static void 238 gendef (const char *format) 239 { 240 const char *p; 241 int i, j; 242 243 /* Start by writing the definition of the function name and the types 244 of the arguments. */ 245 246 printf ("static inline rtx\ngen_rtx_fmt_%s_stat (RTX_CODE code, machine_mode mode", format); 247 for (p = format, i = 0; *p != 0; p++) 248 if (*p != '0') 249 printf (",\n\t%sarg%d", type_from_format (*p), i++); 250 251 puts (" MEM_STAT_DECL)"); 252 253 /* Now write out the body of the function itself, which allocates 254 the memory and initializes it. */ 255 puts ("{"); 256 puts (" rtx rt;"); 257 puts (" rt = rtx_alloc (code PASS_MEM_STAT);\n"); 258 259 puts (" PUT_MODE_RAW (rt, mode);"); 260 261 for (p = format, i = j = 0; *p ; ++p, ++i) 262 if (*p == '0') 263 printf (" X0EXP (rt, %d) = NULL_RTX;\n", i); 264 else if (*p == 'p') 265 printf (" SUBREG_BYTE (rt) = arg%d;\n", j++); 266 else 267 printf (" %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++); 268 269 puts ("\n return rt;\n}\n"); 270 printf ("#define gen_rtx_fmt_%s(c, m", format); 271 for (p = format, i = 0; *p != 0; p++) 272 if (*p != '0') 273 printf (", p%i",i++); 274 printf (")\\\n gen_rtx_fmt_%s_stat (c, m", format); 275 for (p = format, i = 0; *p != 0; p++) 276 if (*p != '0') 277 printf (", p%i",i++); 278 printf (" MEM_STAT_INFO)\n\n"); 279 } 280 281 /* Generate the documentation header for files we write. */ 282 283 static void 284 genlegend (void) 285 { 286 puts ("/* Generated automatically by gengenrtl from rtl.def. */\n"); 287 } 288 289 /* Generate the text of the header file we make, genrtl.h. */ 290 291 static void 292 genheader (void) 293 { 294 unsigned int i; 295 const char **fmt; 296 297 puts ("#ifndef GCC_GENRTL_H"); 298 puts ("#define GCC_GENRTL_H\n"); 299 puts ("#include \"statistics.h\"\n"); 300 301 for (fmt = formats; *fmt; ++fmt) 302 gendef (*fmt); 303 304 putchar ('\n'); 305 306 for (i = 0; i < NUM_RTX_CODE; i++) 307 if (! special_format (defs[i].format)) 308 genmacro (i); 309 310 puts ("\n#endif /* GCC_GENRTL_H */"); 311 } 312 313 /* This is the main program. */ 314 315 int 316 main (void) 317 { 318 find_formats (); 319 genlegend (); 320 321 genheader (); 322 323 if (ferror (stdout) || fflush (stdout) || fclose (stdout)) 324 return FATAL_EXIT_CODE; 325 326 return SUCCESS_EXIT_CODE; 327 } 328