1 /* Generate code to allocate RTL structures. 2 Copyright (C) 1997-2015 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 } 118 119 /* Return nonzero if the RTL code given by index IDX is one that we should 120 generate a gen_rtx_raw_FOO macro for, not gen_rtx_FOO (because gen_rtx_FOO 121 is a wrapper in emit-rtl.c). */ 122 123 static int 124 special_rtx (int idx) 125 { 126 return (strcmp (defs[idx].enumname, "EXPR_LIST") == 0 127 || strcmp (defs[idx].enumname, "INSN_LIST") == 0 128 || strcmp (defs[idx].enumname, "INSN") == 0 129 || strcmp (defs[idx].enumname, "CONST_INT") == 0 130 || strcmp (defs[idx].enumname, "REG") == 0 131 || strcmp (defs[idx].enumname, "SUBREG") == 0 132 || strcmp (defs[idx].enumname, "MEM") == 0 133 || strcmp (defs[idx].enumname, "PC") == 0 134 || strcmp (defs[idx].enumname, "CC0") == 0 135 || strcmp (defs[idx].enumname, "RETURN") == 0 136 || strcmp (defs[idx].enumname, "SIMPLE_RETURN") == 0 137 || strcmp (defs[idx].enumname, "CONST_VECTOR") == 0); 138 } 139 140 /* Return nonzero if the RTL code given by index IDX is one that we should 141 generate no macro for at all (because gen_rtx_FOO is never used or 142 cannot have the obvious interface). */ 143 144 static int 145 excluded_rtx (int idx) 146 { 147 return (strcmp (defs[idx].enumname, "VAR_LOCATION") == 0 148 || strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0 149 || strcmp (defs[idx].enumname, "CONST_WIDE_INT") == 0 150 || strcmp (defs[idx].enumname, "CONST_FIXED") == 0); 151 } 152 153 /* Place a list of all format specifiers we use into the array FORMAT. */ 154 155 static void 156 find_formats (void) 157 { 158 unsigned int i; 159 160 for (i = 0; i < NUM_RTX_CODE; i++) 161 { 162 const char **f; 163 164 if (special_format (defs[i].format)) 165 continue; 166 167 for (f = formats; *f; f++) 168 if (! strcmp (*f, defs[i].format)) 169 break; 170 171 if (*f == 0) 172 *f = defs[i].format; 173 } 174 } 175 176 177 /* Generate macros to generate RTL of code IDX using the functions we 178 write. */ 179 180 static void 181 genmacro (int idx) 182 { 183 const char *p; 184 int i; 185 186 /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to 187 gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE. */ 188 189 if (excluded_rtx (idx)) 190 /* Don't define a macro for this code. */ 191 return; 192 193 printf ("#define gen_rtx_%s%s(MODE", 194 special_rtx (idx) ? "raw_" : "", defs[idx].enumname); 195 196 for (p = defs[idx].format, i = 0; *p != 0; p++) 197 if (*p != '0') 198 printf (", ARG%d", i++); 199 200 printf (") \\\n gen_rtx_fmt_%s (%s, (MODE)", 201 defs[idx].format, defs[idx].enumname); 202 203 for (p = defs[idx].format, i = 0; *p != 0; p++) 204 if (*p != '0') 205 printf (", (ARG%d)", i++); 206 207 puts (")"); 208 } 209 210 /* Generate the code for the function to generate RTL whose 211 format is FORMAT. */ 212 213 static void 214 gendef (const char *format) 215 { 216 const char *p; 217 int i, j; 218 219 /* Start by writing the definition of the function name and the types 220 of the arguments. */ 221 222 printf ("static inline rtx\ngen_rtx_fmt_%s_stat (RTX_CODE code, machine_mode mode", format); 223 for (p = format, i = 0; *p != 0; p++) 224 if (*p != '0') 225 printf (",\n\t%sarg%d", type_from_format (*p), i++); 226 227 puts (" MEM_STAT_DECL)"); 228 229 /* Now write out the body of the function itself, which allocates 230 the memory and initializes it. */ 231 puts ("{"); 232 puts (" rtx rt;"); 233 puts (" rt = rtx_alloc_stat (code PASS_MEM_STAT);\n"); 234 235 puts (" PUT_MODE (rt, mode);"); 236 237 for (p = format, i = j = 0; *p ; ++p, ++i) 238 if (*p != '0') 239 printf (" %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++); 240 else 241 printf (" X0EXP (rt, %d) = NULL_RTX;\n", i); 242 243 puts ("\n return rt;\n}\n"); 244 printf ("#define gen_rtx_fmt_%s(c, m", format); 245 for (p = format, i = 0; *p != 0; p++) 246 if (*p != '0') 247 printf (", p%i",i++); 248 printf (")\\\n gen_rtx_fmt_%s_stat (c, m", format); 249 for (p = format, i = 0; *p != 0; p++) 250 if (*p != '0') 251 printf (", p%i",i++); 252 printf (" MEM_STAT_INFO)\n\n"); 253 } 254 255 /* Generate the documentation header for files we write. */ 256 257 static void 258 genlegend (void) 259 { 260 puts ("/* Generated automatically by gengenrtl from rtl.def. */\n"); 261 } 262 263 /* Generate the text of the header file we make, genrtl.h. */ 264 265 static void 266 genheader (void) 267 { 268 unsigned int i; 269 const char **fmt; 270 271 puts ("#ifndef GCC_GENRTL_H"); 272 puts ("#define GCC_GENRTL_H\n"); 273 puts ("#include \"statistics.h\"\n"); 274 275 for (fmt = formats; *fmt; ++fmt) 276 gendef (*fmt); 277 278 putchar ('\n'); 279 280 for (i = 0; i < NUM_RTX_CODE; i++) 281 if (! special_format (defs[i].format)) 282 genmacro (i); 283 284 puts ("\n#endif /* GCC_GENRTL_H */"); 285 } 286 287 /* This is the main program. */ 288 289 int 290 main (void) 291 { 292 find_formats (); 293 genlegend (); 294 295 genheader (); 296 297 if (ferror (stdout) || fflush (stdout) || fclose (stdout)) 298 return FATAL_EXIT_CODE; 299 300 return SUCCESS_EXIT_CODE; 301 } 302