1 /* Generate code to allocate RTL structures. 2 Copyright (C) 1997-2017 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 's': 58 return "const char *"; 59 60 case 'e': case 'u': 61 return "rtx "; 62 63 case 'E': 64 return "rtvec "; 65 case 't': 66 return "tree "; 67 case 'B': 68 return "basic_block "; 69 default: 70 gcc_unreachable (); 71 } 72 } 73 74 /* Decode a format letter into the proper accessor function. */ 75 76 static const char * 77 accessor_from_format (int c) 78 { 79 switch (c) 80 { 81 case 'i': 82 return "XINT"; 83 84 case 'w': 85 return "XWINT"; 86 87 case 's': 88 return "XSTR"; 89 90 case 'e': case 'u': 91 return "XEXP"; 92 93 case 'E': 94 return "XVEC"; 95 96 case 't': 97 return "XTREE"; 98 99 case 'B': 100 return "XBBDEF"; 101 102 default: 103 gcc_unreachable (); 104 } 105 } 106 107 /* Return nonzero if we should ignore FMT, an RTL format, when making 108 the list of formats we write routines to create. */ 109 110 static int 111 special_format (const char *fmt) 112 { 113 return (strchr (fmt, '*') != 0 114 || strchr (fmt, 'V') != 0 115 || strchr (fmt, 'S') != 0 116 || strchr (fmt, 'n') != 0 117 || strchr (fmt, 'r') != 0); 118 } 119 120 /* Return true if CODE always has VOIDmode. */ 121 122 static inline bool 123 always_void_p (int idx) 124 { 125 return strcmp (defs[idx].enumname, "SET") == 0; 126 } 127 128 /* Return nonzero if the RTL code given by index IDX is one that we should 129 generate a gen_rtx_raw_FOO macro for, not gen_rtx_FOO (because gen_rtx_FOO 130 is a wrapper in emit-rtl.c). */ 131 132 static int 133 special_rtx (int idx) 134 { 135 return (strcmp (defs[idx].enumname, "EXPR_LIST") == 0 136 || strcmp (defs[idx].enumname, "INSN_LIST") == 0 137 || strcmp (defs[idx].enumname, "INSN") == 0 138 || strcmp (defs[idx].enumname, "CONST_INT") == 0 139 || strcmp (defs[idx].enumname, "REG") == 0 140 || strcmp (defs[idx].enumname, "SUBREG") == 0 141 || strcmp (defs[idx].enumname, "MEM") == 0 142 || strcmp (defs[idx].enumname, "PC") == 0 143 || strcmp (defs[idx].enumname, "CC0") == 0 144 || strcmp (defs[idx].enumname, "RETURN") == 0 145 || strcmp (defs[idx].enumname, "SIMPLE_RETURN") == 0 146 || strcmp (defs[idx].enumname, "CONST_VECTOR") == 0); 147 } 148 149 /* Return nonzero if the RTL code given by index IDX is one that we should 150 generate no macro for at all (because gen_rtx_FOO is never used or 151 cannot have the obvious interface). */ 152 153 static int 154 excluded_rtx (int idx) 155 { 156 return (strcmp (defs[idx].enumname, "VAR_LOCATION") == 0 157 || strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0 158 || strcmp (defs[idx].enumname, "CONST_WIDE_INT") == 0 159 || strcmp (defs[idx].enumname, "CONST_FIXED") == 0); 160 } 161 162 /* Place a list of all format specifiers we use into the array FORMAT. */ 163 164 static void 165 find_formats (void) 166 { 167 unsigned int i; 168 169 for (i = 0; i < NUM_RTX_CODE; i++) 170 { 171 const char **f; 172 173 if (special_format (defs[i].format)) 174 continue; 175 176 for (f = formats; *f; f++) 177 if (! strcmp (*f, defs[i].format)) 178 break; 179 180 if (*f == 0) 181 *f = defs[i].format; 182 } 183 } 184 185 186 /* Generate macros to generate RTL of code IDX using the functions we 187 write. */ 188 189 static void 190 genmacro (int idx) 191 { 192 const char *p; 193 const char *sep = ""; 194 int i; 195 196 /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to 197 gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE. */ 198 199 if (excluded_rtx (idx)) 200 /* Don't define a macro for this code. */ 201 return; 202 203 bool has_mode_p = !always_void_p (idx); 204 printf ("#define gen_rtx_%s%s(", 205 special_rtx (idx) ? "raw_" : "", defs[idx].enumname); 206 if (has_mode_p) 207 { 208 printf ("MODE"); 209 sep = ", "; 210 } 211 212 for (p = defs[idx].format, i = 0; *p != 0; p++) 213 if (*p != '0') 214 { 215 printf ("%sARG%d", sep, i++); 216 sep = ", "; 217 } 218 219 printf (") \\\n gen_rtx_fmt_%s (%s, %s", 220 defs[idx].format, defs[idx].enumname, 221 has_mode_p ? "(MODE)" : "VOIDmode"); 222 223 for (p = defs[idx].format, i = 0; *p != 0; p++) 224 if (*p != '0') 225 printf (", (ARG%d)", i++); 226 227 puts (")"); 228 } 229 230 /* Generate the code for the function to generate RTL whose 231 format is FORMAT. */ 232 233 static void 234 gendef (const char *format) 235 { 236 const char *p; 237 int i, j; 238 239 /* Start by writing the definition of the function name and the types 240 of the arguments. */ 241 242 printf ("static inline rtx\ngen_rtx_fmt_%s_stat (RTX_CODE code, machine_mode mode", format); 243 for (p = format, i = 0; *p != 0; p++) 244 if (*p != '0') 245 printf (",\n\t%sarg%d", type_from_format (*p), i++); 246 247 puts (" MEM_STAT_DECL)"); 248 249 /* Now write out the body of the function itself, which allocates 250 the memory and initializes it. */ 251 puts ("{"); 252 puts (" rtx rt;"); 253 puts (" rt = rtx_alloc_stat (code PASS_MEM_STAT);\n"); 254 255 puts (" PUT_MODE_RAW (rt, mode);"); 256 257 for (p = format, i = j = 0; *p ; ++p, ++i) 258 if (*p != '0') 259 printf (" %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++); 260 else 261 printf (" X0EXP (rt, %d) = NULL_RTX;\n", i); 262 263 puts ("\n return rt;\n}\n"); 264 printf ("#define gen_rtx_fmt_%s(c, m", format); 265 for (p = format, i = 0; *p != 0; p++) 266 if (*p != '0') 267 printf (", p%i",i++); 268 printf (")\\\n gen_rtx_fmt_%s_stat (c, m", format); 269 for (p = format, i = 0; *p != 0; p++) 270 if (*p != '0') 271 printf (", p%i",i++); 272 printf (" MEM_STAT_INFO)\n\n"); 273 } 274 275 /* Generate the documentation header for files we write. */ 276 277 static void 278 genlegend (void) 279 { 280 puts ("/* Generated automatically by gengenrtl from rtl.def. */\n"); 281 } 282 283 /* Generate the text of the header file we make, genrtl.h. */ 284 285 static void 286 genheader (void) 287 { 288 unsigned int i; 289 const char **fmt; 290 291 puts ("#ifndef GCC_GENRTL_H"); 292 puts ("#define GCC_GENRTL_H\n"); 293 puts ("#include \"statistics.h\"\n"); 294 295 for (fmt = formats; *fmt; ++fmt) 296 gendef (*fmt); 297 298 putchar ('\n'); 299 300 for (i = 0; i < NUM_RTX_CODE; i++) 301 if (! special_format (defs[i].format)) 302 genmacro (i); 303 304 puts ("\n#endif /* GCC_GENRTL_H */"); 305 } 306 307 /* This is the main program. */ 308 309 int 310 main (void) 311 { 312 find_formats (); 313 genlegend (); 314 315 genheader (); 316 317 if (ferror (stdout) || fflush (stdout) || fclose (stdout)) 318 return FATAL_EXIT_CODE; 319 320 return SUCCESS_EXIT_CODE; 321 } 322