Daily bump.
[official-gcc.git] / gcc / genconditions.c
blob65f64c085ce9383f31dc951bd099d5a552b0fd4b
1 /* Process machine description and calculate constant conditions.
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007
3 Free Software Foundation, Inc.
5 This file is part of GCC.
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.
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.
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/>. */
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. */
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"
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 \"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");
93 if (saw_eh_return)
94 puts ("#define HAVE_eh_return 1");
95 puts ("#include \"except.h\"\n");
97 puts ("\
98 /* Dummy external declarations. */\n\
99 extern rtx insn;\n\
100 extern rtx ins1;\n\
101 extern rtx operands[];\n\
103 #endif /* gcc >= 3.0.1 */\n");
106 /* Write out one entry in the conditions table, using the data pointed
107 to by SLOT. Each entry looks like this:
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) }, */
114 static int
115 write_one_condition (void **slot, void * ARG_UNUSED (dummy))
117 const struct c_test *test = * (const struct c_test **) slot;
118 const char *p;
120 print_rtx_ptr_loc (test->expr);
121 fputs (" { \"", stdout);
122 for (p = test->expr; *p; p++)
124 switch (*p)
126 case '\n': fputs ("\\n\\", stdout); break;
127 case '\\':
128 case '\"': putchar ('\\'); break;
129 default: break;
131 putchar (*p);
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;
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)
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\
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\
164 #if GCC_VERSION >= 3001\n\
165 static const struct c_test insn_conditions[] = {\n");
167 traverse_c_tests (write_one_condition, 0);
169 puts ("\n};\n#endif /* gcc >= 3.0.1 */\n");
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)
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 "}");
209 main (int argc, char **argv)
211 rtx desc;
212 int pattern_lineno; /* not used */
213 int code;
215 progname = "genconditions";
217 if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
218 return (FATAL_EXIT_CODE);
220 /* Read the machine description. */
221 while (1)
223 desc = read_md_rtx (&pattern_lineno, &code);
224 if (desc == NULL)
225 break;
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))
231 default:
232 break;
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;
243 case DEFINE_SPLIT:
244 case DEFINE_PEEPHOLE:
245 case DEFINE_PEEPHOLE2:
246 add_c_test (XSTR (desc, 1), -1);
247 break;
251 write_header ();
252 write_conditions ();
253 write_writer ();
255 fflush (stdout);
256 return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);