2014-07-12 Paul Thomas <pault@gcc.gnu.org>
[official-gcc.git] / gcc / gengenrtl.c
blob550efb8e17091329a83a4841fbde40f4c47b0c04
1 /* Generate code to allocate RTL structures.
2 Copyright (C) 1997-2014 Free Software Foundation, Inc.
4 This file is part of GCC.
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.
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.
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/>. */
21 #include "bconfig.h"
22 #include "system.h"
24 struct rtx_definition
26 const char *const enumname, *const name, *const format;
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 ""
34 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { #ENUM, NAME, FORMAT },
36 static const struct rtx_definition defs[] =
38 #include "rtl.def" /* rtl expressions are documented here */
40 #define NUM_RTX_CODE ARRAY_SIZE (defs)
42 static const char *formats[NUM_RTX_CODE];
44 /* Decode a format letter into a C type string. */
46 static const char *
47 type_from_format (int c)
49 switch (c)
51 case 'i':
52 return "int ";
54 case 'w':
55 return "HOST_WIDE_INT ";
57 case 's':
58 return "const char *";
60 case 'e': case 'u':
61 return "rtx ";
63 case 'E':
64 return "rtvec ";
65 case 't':
66 return "tree ";
67 case 'B':
68 return "basic_block ";
69 default:
70 gcc_unreachable ();
74 /* Decode a format letter into the proper accessor function. */
76 static const char *
77 accessor_from_format (int c)
79 switch (c)
81 case 'i':
82 return "XINT";
84 case 'w':
85 return "XWINT";
87 case 's':
88 return "XSTR";
90 case 'e': case 'u':
91 return "XEXP";
93 case 'E':
94 return "XVEC";
96 case 't':
97 return "XTREE";
99 case 'B':
100 return "XBBDEF";
102 default:
103 gcc_unreachable ();
107 /* Return nonzero if we should ignore FMT, an RTL format, when making
108 the list of formats we write routines to create. */
110 static int
111 special_format (const char *fmt)
113 return (strchr (fmt, '*') != 0
114 || strchr (fmt, 'V') != 0
115 || strchr (fmt, 'S') != 0
116 || strchr (fmt, 'n') != 0);
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). */
123 static int
124 special_rtx (int idx)
126 return (strcmp (defs[idx].enumname, "CONST_INT") == 0
127 || strcmp (defs[idx].enumname, "REG") == 0
128 || strcmp (defs[idx].enumname, "SUBREG") == 0
129 || strcmp (defs[idx].enumname, "MEM") == 0
130 || strcmp (defs[idx].enumname, "PC") == 0
131 || strcmp (defs[idx].enumname, "CC0") == 0
132 || strcmp (defs[idx].enumname, "RETURN") == 0
133 || strcmp (defs[idx].enumname, "SIMPLE_RETURN") == 0
134 || strcmp (defs[idx].enumname, "CONST_VECTOR") == 0);
137 /* Return nonzero if the RTL code given by index IDX is one that we should
138 generate no macro for at all (because gen_rtx_FOO is never used or
139 cannot have the obvious interface). */
141 static int
142 excluded_rtx (int idx)
144 return (strcmp (defs[idx].enumname, "VAR_LOCATION") == 0
145 || strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0
146 || strcmp (defs[idx].enumname, "CONST_WIDE_INT") == 0
147 || strcmp (defs[idx].enumname, "CONST_FIXED") == 0);
150 /* Place a list of all format specifiers we use into the array FORMAT. */
152 static void
153 find_formats (void)
155 unsigned int i;
157 for (i = 0; i < NUM_RTX_CODE; i++)
159 const char **f;
161 if (special_format (defs[i].format))
162 continue;
164 for (f = formats; *f; f++)
165 if (! strcmp (*f, defs[i].format))
166 break;
168 if (*f == 0)
169 *f = defs[i].format;
174 /* Generate macros to generate RTL of code IDX using the functions we
175 write. */
177 static void
178 genmacro (int idx)
180 const char *p;
181 int i;
183 /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to
184 gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE. */
186 if (excluded_rtx (idx))
187 /* Don't define a macro for this code. */
188 return;
190 printf ("#define gen_rtx_%s%s(MODE",
191 special_rtx (idx) ? "raw_" : "", defs[idx].enumname);
193 for (p = defs[idx].format, i = 0; *p != 0; p++)
194 if (*p != '0')
195 printf (", ARG%d", i++);
197 printf (") \\\n gen_rtx_fmt_%s (%s, (MODE)",
198 defs[idx].format, defs[idx].enumname);
200 for (p = defs[idx].format, i = 0; *p != 0; p++)
201 if (*p != '0')
202 printf (", (ARG%d)", i++);
204 puts (")");
207 /* Generate the code for the function to generate RTL whose
208 format is FORMAT. */
210 static void
211 gendef (const char *format)
213 const char *p;
214 int i, j;
216 /* Start by writing the definition of the function name and the types
217 of the arguments. */
219 printf ("static inline rtx\ngen_rtx_fmt_%s_stat (RTX_CODE code, enum machine_mode mode", format);
220 for (p = format, i = 0; *p != 0; p++)
221 if (*p != '0')
222 printf (",\n\t%sarg%d", type_from_format (*p), i++);
224 puts (" MEM_STAT_DECL)");
226 /* Now write out the body of the function itself, which allocates
227 the memory and initializes it. */
228 puts ("{");
229 puts (" rtx rt;");
230 puts (" rt = rtx_alloc_stat (code PASS_MEM_STAT);\n");
232 puts (" PUT_MODE (rt, mode);");
234 for (p = format, i = j = 0; *p ; ++p, ++i)
235 if (*p != '0')
236 printf (" %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++);
237 else
238 printf (" X0EXP (rt, %d) = NULL_RTX;\n", i);
240 puts ("\n return rt;\n}\n");
241 printf ("#define gen_rtx_fmt_%s(c, m", format);
242 for (p = format, i = 0; *p != 0; p++)
243 if (*p != '0')
244 printf (", p%i",i++);
245 printf (")\\\n gen_rtx_fmt_%s_stat (c, m", format);
246 for (p = format, i = 0; *p != 0; p++)
247 if (*p != '0')
248 printf (", p%i",i++);
249 printf (" MEM_STAT_INFO)\n\n");
252 /* Generate the documentation header for files we write. */
254 static void
255 genlegend (void)
257 puts ("/* Generated automatically by gengenrtl from rtl.def. */\n");
260 /* Generate the text of the header file we make, genrtl.h. */
262 static void
263 genheader (void)
265 unsigned int i;
266 const char **fmt;
268 puts ("#ifndef GCC_GENRTL_H");
269 puts ("#define GCC_GENRTL_H\n");
270 puts ("#include \"statistics.h\"\n");
272 for (fmt = formats; *fmt; ++fmt)
273 gendef (*fmt);
275 putchar ('\n');
277 for (i = 0; i < NUM_RTX_CODE; i++)
278 if (! special_format (defs[i].format))
279 genmacro (i);
281 puts ("\n#endif /* GCC_GENRTL_H */");
284 /* This is the main program. */
287 main (void)
289 find_formats ();
290 genlegend ();
292 genheader ();
294 if (ferror (stdout) || fflush (stdout) || fclose (stdout))
295 return FATAL_EXIT_CODE;
297 return SUCCESS_EXIT_CODE;