1 /* Generate code to allocate RTL structures.
2 Copyright (C) 1997-2014 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 *
type_from_format(int c)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 *
accessor_from_format(int c)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
special_format(const char * fmt)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
special_rtx(int idx)124 special_rtx (int idx)
125 {
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);
135 }
136
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). */
140
141 static int
excluded_rtx(int idx)142 excluded_rtx (int idx)
143 {
144 return ((strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0)
145 || (strcmp (defs[idx].enumname, "CONST_FIXED") == 0));
146 }
147
148 /* Place a list of all format specifiers we use into the array FORMAT. */
149
150 static void
find_formats(void)151 find_formats (void)
152 {
153 unsigned int i;
154
155 for (i = 0; i < NUM_RTX_CODE; i++)
156 {
157 const char **f;
158
159 if (special_format (defs[i].format))
160 continue;
161
162 for (f = formats; *f; f++)
163 if (! strcmp (*f, defs[i].format))
164 break;
165
166 if (*f == 0)
167 *f = defs[i].format;
168 }
169 }
170
171
172 /* Generate macros to generate RTL of code IDX using the functions we
173 write. */
174
175 static void
genmacro(int idx)176 genmacro (int idx)
177 {
178 const char *p;
179 int i;
180
181 /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to
182 gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE. */
183
184 if (excluded_rtx (idx))
185 /* Don't define a macro for this code. */
186 return;
187
188 printf ("#define gen_rtx_%s%s(MODE",
189 special_rtx (idx) ? "raw_" : "", defs[idx].enumname);
190
191 for (p = defs[idx].format, i = 0; *p != 0; p++)
192 if (*p != '0')
193 printf (", ARG%d", i++);
194
195 printf (") \\\n gen_rtx_fmt_%s (%s, (MODE)",
196 defs[idx].format, defs[idx].enumname);
197
198 for (p = defs[idx].format, i = 0; *p != 0; p++)
199 if (*p != '0')
200 printf (", (ARG%d)", i++);
201
202 puts (")");
203 }
204
205 /* Generate the code for the function to generate RTL whose
206 format is FORMAT. */
207
208 static void
gendef(const char * format)209 gendef (const char *format)
210 {
211 const char *p;
212 int i, j;
213
214 /* Start by writing the definition of the function name and the types
215 of the arguments. */
216
217 printf ("static inline rtx\ngen_rtx_fmt_%s_stat (RTX_CODE code, enum machine_mode mode", format);
218 for (p = format, i = 0; *p != 0; p++)
219 if (*p != '0')
220 printf (",\n\t%sarg%d", type_from_format (*p), i++);
221
222 puts (" MEM_STAT_DECL)");
223
224 /* Now write out the body of the function itself, which allocates
225 the memory and initializes it. */
226 puts ("{");
227 puts (" rtx rt;");
228 puts (" rt = rtx_alloc_stat (code PASS_MEM_STAT);\n");
229
230 puts (" PUT_MODE (rt, mode);");
231
232 for (p = format, i = j = 0; *p ; ++p, ++i)
233 if (*p != '0')
234 printf (" %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++);
235 else
236 printf (" X0EXP (rt, %d) = NULL_RTX;\n", i);
237
238 puts ("\n return rt;\n}\n");
239 printf ("#define gen_rtx_fmt_%s(c, m", format);
240 for (p = format, i = 0; *p != 0; p++)
241 if (*p != '0')
242 printf (", p%i",i++);
243 printf (")\\\n gen_rtx_fmt_%s_stat (c, m", format);
244 for (p = format, i = 0; *p != 0; p++)
245 if (*p != '0')
246 printf (", p%i",i++);
247 printf (" MEM_STAT_INFO)\n\n");
248 }
249
250 /* Generate the documentation header for files we write. */
251
252 static void
genlegend(void)253 genlegend (void)
254 {
255 puts ("/* Generated automatically by gengenrtl from rtl.def. */\n");
256 }
257
258 /* Generate the text of the header file we make, genrtl.h. */
259
260 static void
genheader(void)261 genheader (void)
262 {
263 unsigned int i;
264 const char **fmt;
265
266 puts ("#ifndef GCC_GENRTL_H");
267 puts ("#define GCC_GENRTL_H\n");
268 puts ("#include \"statistics.h\"\n");
269
270 for (fmt = formats; *fmt; ++fmt)
271 gendef (*fmt);
272
273 putchar ('\n');
274
275 for (i = 0; i < NUM_RTX_CODE; i++)
276 if (! special_format (defs[i].format))
277 genmacro (i);
278
279 puts ("\n#endif /* GCC_GENRTL_H */");
280 }
281
282 /* This is the main program. */
283
284 int
main(void)285 main (void)
286 {
287 find_formats ();
288 genlegend ();
289
290 genheader ();
291
292 if (ferror (stdout) || fflush (stdout) || fclose (stdout))
293 return FATAL_EXIT_CODE;
294
295 return SUCCESS_EXIT_CODE;
296 }
297