Daily bump.
[official-gcc.git] / gcc / genconditions.c
blobdc22c78a42e2848d920afffa47545698aa235e3f
1 /* Process machine description and calculate constant conditions.
2 Copyright (C) 2001-2014 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
9 any later version.
11 GCC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License 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/>. */
20 /* In a machine description, all of the insn patterns - define_insn,
21 define_expand, define_split, define_peephole, define_peephole2 -
22 contain an optional C expression which makes the final decision
23 about whether or not this pattern is usable. That expression may
24 turn out to be always false when the compiler is built. If it is,
25 most of the programs that generate code from the machine
26 description can simply ignore the entire pattern. */
28 #include "bconfig.h"
29 #include "system.h"
30 #include "coretypes.h"
31 #include "tm.h"
32 #include "rtl.h"
33 #include "errors.h"
34 #include "hashtab.h"
35 #include "read-md.h"
36 #include "gensupport.h"
38 /* so we can include except.h in the generated file. */
39 static int saw_eh_return;
41 static void write_header (void);
42 static void write_conditions (void);
43 static int write_one_condition (void **, void *);
45 /* Generate the header for insn-conditions.c. */
47 static void
48 write_header (void)
50 puts ("\
51 /* Generated automatically by the program `genconditions' from the target\n\
52 machine description file. */\n\
53 \n\
54 #include \"bconfig.h\"\n\
55 #include \"system.h\"\n\
56 \n\
57 /* It is necessary, but not entirely safe, to include the headers below\n\
58 in a generator program. As a defensive measure, don't do so when the\n\
59 table isn't going to have anything in it. */\n\
60 #if GCC_VERSION >= 3001\n\
61 \n\
62 /* Do not allow checking to confuse the issue. */\n\
63 #undef ENABLE_CHECKING\n\
64 #undef ENABLE_TREE_CHECKING\n\
65 #undef ENABLE_RTL_CHECKING\n\
66 #undef ENABLE_RTL_FLAG_CHECKING\n\
67 #undef ENABLE_GC_CHECKING\n\
68 #undef ENABLE_GC_ALWAYS_COLLECT\n\
69 \n\
70 #include \"coretypes.h\"\n\
71 #include \"tm.h\"\n\
72 #include \"insn-constants.h\"\n\
73 #include \"rtl.h\"\n\
74 #include \"tm_p.h\"\n\
75 #include \"function.h\"\n\
76 \n\
77 /* Fake - insn-config.h doesn't exist yet. */\n\
78 #define MAX_RECOG_OPERANDS 10\n\
79 #define MAX_DUP_OPERANDS 10\n\
80 #define MAX_INSNS_PER_SPLIT 5\n\
81 \n\
82 #include \"regs.h\"\n\
83 #include \"recog.h\"\n\
84 #include \"output.h\"\n\
85 #include \"flags.h\"\n\
86 #include \"hard-reg-set.h\"\n\
87 #include \"resource.h\"\n\
88 #include \"diagnostic-core.h\"\n\
89 #include \"reload.h\"\n\
90 #include \"tm-constrs.h\"\n");
92 if (saw_eh_return)
93 puts ("#define HAVE_eh_return 1");
94 puts ("#include \"except.h\"\n");
96 puts ("\
97 /* Dummy external declarations. */\n\
98 extern rtx insn;\n\
99 extern rtx ins1;\n\
100 extern rtx operands[];\n\
102 #endif /* gcc >= 3.0.1 */\n");
105 /* Write out one entry in the conditions table, using the data pointed
106 to by SLOT. Each entry looks like this:
108 { "! optimize_size && ! TARGET_READ_MODIFY_WRITE",
109 __builtin_constant_p (! optimize_size && ! TARGET_READ_MODIFY_WRITE)
110 ? (int) (! optimize_size && ! TARGET_READ_MODIFY_WRITE)
111 : -1) }, */
113 static int
114 write_one_condition (void **slot, void * ARG_UNUSED (dummy))
116 const struct c_test *test = * (const struct c_test **) slot;
117 const char *p;
119 print_md_ptr_loc (test->expr);
120 fputs (" { \"", stdout);
121 for (p = test->expr; *p; p++)
123 switch (*p)
125 case '\n': fputs ("\\n\\", stdout); break;
126 case '\\':
127 case '\"': putchar ('\\'); break;
128 default: break;
130 putchar (*p);
133 fputs ("\",\n __builtin_constant_p ", stdout);
134 print_c_condition (test->expr);
135 fputs ("\n ? (int) ", stdout);
136 print_c_condition (test->expr);
137 fputs ("\n : -1 },\n", stdout);
138 return 1;
141 /* Write out the complete conditions table, its size, and a flag
142 indicating that gensupport.c can now do insn elision. */
143 static void
144 write_conditions (void)
146 puts ("\
147 /* Structure definition duplicated from gensupport.h rather than\n\
148 drag in that file and its dependencies. */\n\
149 struct c_test\n\
150 {\n\
151 const char *expr;\n\
152 int value;\n\
153 };\n\
155 /* This table lists each condition found in the machine description.\n\
156 Each condition is mapped to its truth value (0 or 1), or -1 if that\n\
157 cannot be calculated at compile time.\n\
158 If we don't have __builtin_constant_p, or it's not acceptable in array\n\
159 initializers, fall back to assuming that all conditions potentially\n\
160 vary at run time. It works in 3.0.1 and later; 3.0 only when not\n\
161 optimizing. */\n\
163 #if GCC_VERSION >= 3001\n\
164 static const struct c_test insn_conditions[] = {\n");
166 traverse_c_tests (write_one_condition, 0);
168 puts ("\n};\n#endif /* gcc >= 3.0.1 */\n");
171 /* Emit code which will convert the C-format table to a
172 (define_conditions) form, which the MD reader can understand.
173 The result will be added to the set of files scanned by
174 'downstream' generators. */
175 static void
176 write_writer (void)
178 puts ("int\n"
179 "main(void)\n"
180 "{\n"
181 " unsigned int i;\n"
182 " const char *p;\n"
183 " puts (\"(define_conditions [\");\n"
184 "#if GCC_VERSION >= 3001\n"
185 " for (i = 0; i < ARRAY_SIZE (insn_conditions); i++)\n"
186 " {\n"
187 " printf (\" (%d \\\"\", insn_conditions[i].value);\n"
188 " for (p = insn_conditions[i].expr; *p; p++)\n"
189 " {\n"
190 " switch (*p)\n"
191 " {\n"
192 " case '\\\\':\n"
193 " case '\\\"': putchar ('\\\\'); break;\n"
194 " default: break;\n"
195 " }\n"
196 " putchar (*p);\n"
197 " }\n"
198 " puts (\"\\\")\");\n"
199 " }\n"
200 "#endif /* gcc >= 3.0.1 */\n"
201 " puts (\"])\");\n"
202 " fflush (stdout);\n"
203 "return ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE;\n"
204 "}");
208 main (int argc, char **argv)
210 rtx desc;
211 int pattern_lineno; /* not used */
212 int code;
214 progname = "genconditions";
216 if (!init_rtx_reader_args (argc, argv))
217 return (FATAL_EXIT_CODE);
219 /* Read the machine description. */
220 while (1)
222 desc = read_md_rtx (&pattern_lineno, &code);
223 if (desc == NULL)
224 break;
226 /* N.B. define_insn_and_split, define_cond_exec are handled
227 entirely within read_md_rtx; we never see them. */
228 switch (GET_CODE (desc))
230 default:
231 break;
233 case DEFINE_INSN:
234 case DEFINE_EXPAND:
235 add_c_test (XSTR (desc, 2), -1);
236 /* except.h needs to know whether there is an eh_return
237 pattern in the machine description. */
238 if (!strcmp (XSTR (desc, 0), "eh_return"))
239 saw_eh_return = 1;
240 break;
242 case DEFINE_SPLIT:
243 case DEFINE_PEEPHOLE:
244 case DEFINE_PEEPHOLE2:
245 add_c_test (XSTR (desc, 1), -1);
246 break;
250 write_header ();
251 write_conditions ();
252 write_writer ();
254 fflush (stdout);
255 return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);