Mercurial > hg > CbC > CbC_gcc
comparison gcc/genconditions.c @ 0:a06113de4d67
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author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2009 14:47:48 +0900 |
parents | |
children | b7f97abdc517 |
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1 /* Process machine description and calculate constant conditions. | |
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007 | |
3 Free Software Foundation, Inc. | |
4 | |
5 This file is part of GCC. | |
6 | |
7 GCC is free software; you can redistribute it and/or modify | |
8 it under the terms of the GNU General Public License as published by | |
9 the Free Software Foundation; either version 3, or (at your option) | |
10 any later version. | |
11 | |
12 GCC is distributed in the hope that it will be useful, | |
13 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 GNU General Public License for more details. | |
16 | |
17 You should have received a copy of the GNU General Public License | |
18 along with GCC; see the file COPYING3. If not see | |
19 <http://www.gnu.org/licenses/>. */ | |
20 | |
21 /* In a machine description, all of the insn patterns - define_insn, | |
22 define_expand, define_split, define_peephole, define_peephole2 - | |
23 contain an optional C expression which makes the final decision | |
24 about whether or not this pattern is usable. That expression may | |
25 turn out to be always false when the compiler is built. If it is, | |
26 most of the programs that generate code from the machine | |
27 description can simply ignore the entire pattern. */ | |
28 | |
29 #include "bconfig.h" | |
30 #include "system.h" | |
31 #include "coretypes.h" | |
32 #include "tm.h" | |
33 #include "rtl.h" | |
34 #include "errors.h" | |
35 #include "hashtab.h" | |
36 #include "gensupport.h" | |
37 | |
38 /* so we can include except.h in the generated file. */ | |
39 static int saw_eh_return; | |
40 | |
41 static void write_header (void); | |
42 static void write_conditions (void); | |
43 static int write_one_condition (void **, void *); | |
44 | |
45 /* Generate the header for insn-conditions.c. */ | |
46 | |
47 static void | |
48 write_header (void) | |
49 { | |
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 \"real.h\"\n\ | |
85 #include \"output.h\"\n\ | |
86 #include \"flags.h\"\n\ | |
87 #include \"hard-reg-set.h\"\n\ | |
88 #include \"resource.h\"\n\ | |
89 #include \"toplev.h\"\n\ | |
90 #include \"reload.h\"\n\ | |
91 #include \"tm-constrs.h\"\n"); | |
92 | |
93 if (saw_eh_return) | |
94 puts ("#define HAVE_eh_return 1"); | |
95 puts ("#include \"except.h\"\n"); | |
96 | |
97 puts ("\ | |
98 /* Dummy external declarations. */\n\ | |
99 extern rtx insn;\n\ | |
100 extern rtx ins1;\n\ | |
101 extern rtx operands[];\n\ | |
102 \n\ | |
103 #endif /* gcc >= 3.0.1 */\n"); | |
104 } | |
105 | |
106 /* Write out one entry in the conditions table, using the data pointed | |
107 to by SLOT. Each entry looks like this: | |
108 | |
109 { "! optimize_size && ! TARGET_READ_MODIFY_WRITE", | |
110 __builtin_constant_p (! optimize_size && ! TARGET_READ_MODIFY_WRITE) | |
111 ? (int) (! optimize_size && ! TARGET_READ_MODIFY_WRITE) | |
112 : -1) }, */ | |
113 | |
114 static int | |
115 write_one_condition (void **slot, void * ARG_UNUSED (dummy)) | |
116 { | |
117 const struct c_test *test = * (const struct c_test **) slot; | |
118 const char *p; | |
119 | |
120 print_rtx_ptr_loc (test->expr); | |
121 fputs (" { \"", stdout); | |
122 for (p = test->expr; *p; p++) | |
123 { | |
124 switch (*p) | |
125 { | |
126 case '\n': fputs ("\\n\\", stdout); break; | |
127 case '\\': | |
128 case '\"': putchar ('\\'); break; | |
129 default: break; | |
130 } | |
131 putchar (*p); | |
132 } | |
133 | |
134 fputs ("\",\n __builtin_constant_p ", stdout); | |
135 print_c_condition (test->expr); | |
136 fputs ("\n ? (int) ", stdout); | |
137 print_c_condition (test->expr); | |
138 fputs ("\n : -1 },\n", stdout); | |
139 return 1; | |
140 } | |
141 | |
142 /* Write out the complete conditions table, its size, and a flag | |
143 indicating that gensupport.c can now do insn elision. */ | |
144 static void | |
145 write_conditions (void) | |
146 { | |
147 puts ("\ | |
148 /* Structure definition duplicated from gensupport.h rather than\n\ | |
149 drag in that file and its dependencies. */\n\ | |
150 struct c_test\n\ | |
151 {\n\ | |
152 const char *expr;\n\ | |
153 int value;\n\ | |
154 };\n\ | |
155 \n\ | |
156 /* This table lists each condition found in the machine description.\n\ | |
157 Each condition is mapped to its truth value (0 or 1), or -1 if that\n\ | |
158 cannot be calculated at compile time.\n\ | |
159 If we don't have __builtin_constant_p, or it's not acceptable in array\n\ | |
160 initializers, fall back to assuming that all conditions potentially\n\ | |
161 vary at run time. It works in 3.0.1 and later; 3.0 only when not\n\ | |
162 optimizing. */\n\ | |
163 \n\ | |
164 #if GCC_VERSION >= 3001\n\ | |
165 static const struct c_test insn_conditions[] = {\n"); | |
166 | |
167 traverse_c_tests (write_one_condition, 0); | |
168 | |
169 puts ("\n};\n#endif /* gcc >= 3.0.1 */\n"); | |
170 } | |
171 | |
172 /* Emit code which will convert the C-format table to a | |
173 (define_conditions) form, which the MD reader can understand. | |
174 The result will be added to the set of files scanned by | |
175 'downstream' generators. */ | |
176 static void | |
177 write_writer (void) | |
178 { | |
179 puts ("int\n" | |
180 "main(void)\n" | |
181 "{\n" | |
182 " unsigned int i;\n" | |
183 " const char *p;\n" | |
184 " puts (\"(define_conditions [\");\n" | |
185 "#if GCC_VERSION >= 3001\n" | |
186 " for (i = 0; i < ARRAY_SIZE (insn_conditions); i++)\n" | |
187 " {\n" | |
188 " printf (\" (%d \\\"\", insn_conditions[i].value);\n" | |
189 " for (p = insn_conditions[i].expr; *p; p++)\n" | |
190 " {\n" | |
191 " switch (*p)\n" | |
192 " {\n" | |
193 " case '\\\\':\n" | |
194 " case '\\\"': putchar ('\\\\'); break;\n" | |
195 " default: break;\n" | |
196 " }\n" | |
197 " putchar (*p);\n" | |
198 " }\n" | |
199 " puts (\"\\\")\");\n" | |
200 " }\n" | |
201 "#endif /* gcc >= 3.0.1 */\n" | |
202 " puts (\"])\");\n" | |
203 " fflush (stdout);\n" | |
204 "return ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE;\n" | |
205 "}"); | |
206 } | |
207 | |
208 int | |
209 main (int argc, char **argv) | |
210 { | |
211 rtx desc; | |
212 int pattern_lineno; /* not used */ | |
213 int code; | |
214 | |
215 progname = "genconditions"; | |
216 | |
217 if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE) | |
218 return (FATAL_EXIT_CODE); | |
219 | |
220 /* Read the machine description. */ | |
221 while (1) | |
222 { | |
223 desc = read_md_rtx (&pattern_lineno, &code); | |
224 if (desc == NULL) | |
225 break; | |
226 | |
227 /* N.B. define_insn_and_split, define_cond_exec are handled | |
228 entirely within read_md_rtx; we never see them. */ | |
229 switch (GET_CODE (desc)) | |
230 { | |
231 default: | |
232 break; | |
233 | |
234 case DEFINE_INSN: | |
235 case DEFINE_EXPAND: | |
236 add_c_test (XSTR (desc, 2), -1); | |
237 /* except.h needs to know whether there is an eh_return | |
238 pattern in the machine description. */ | |
239 if (!strcmp (XSTR (desc, 0), "eh_return")) | |
240 saw_eh_return = 1; | |
241 break; | |
242 | |
243 case DEFINE_SPLIT: | |
244 case DEFINE_PEEPHOLE: | |
245 case DEFINE_PEEPHOLE2: | |
246 add_c_test (XSTR (desc, 1), -1); | |
247 break; | |
248 } | |
249 } | |
250 | |
251 write_header (); | |
252 write_conditions (); | |
253 write_writer (); | |
254 | |
255 fflush (stdout); | |
256 return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE); | |
257 } |