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7a938933 | 1 | /* go-lang.c -- Go frontend gcc interface. |
ff5f50c5 | 2 | Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc. |
7a938933 ILT |
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 | #include "config.h" | |
21 | #include "system.h" | |
22 | #include "ansidecl.h" | |
23 | #include "coretypes.h" | |
24 | #include "opts.h" | |
25 | #include "tree.h" | |
26 | #include "gimple.h" | |
27 | #include "ggc.h" | |
28 | #include "toplev.h" | |
29 | #include "debug.h" | |
30 | #include "options.h" | |
31 | #include "flags.h" | |
32 | #include "convert.h" | |
33 | #include "diagnostic.h" | |
34 | #include "langhooks.h" | |
35 | #include "langhooks-def.h" | |
36 | #include "except.h" | |
37 | #include "target.h" | |
38 | ||
39 | #include <mpfr.h> | |
40 | ||
41 | #include "go-c.h" | |
42 | ||
43 | /* Language-dependent contents of a type. */ | |
44 | ||
45 | struct GTY(()) lang_type | |
46 | { | |
47 | char dummy; | |
48 | }; | |
49 | ||
50 | /* Language-dependent contents of a decl. */ | |
51 | ||
52 | struct GTY(()) lang_decl | |
53 | { | |
54 | char dummy; | |
55 | }; | |
56 | ||
57 | /* Language-dependent contents of an identifier. This must include a | |
58 | tree_identifier. */ | |
59 | ||
60 | struct GTY(()) lang_identifier | |
61 | { | |
62 | struct tree_identifier common; | |
63 | }; | |
64 | ||
65 | /* The resulting tree type. */ | |
66 | ||
67 | union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"), | |
68 | chain_next ("(union lang_tree_node *) TREE_CHAIN (&%h.generic)"))) | |
69 | lang_tree_node | |
70 | { | |
71 | union tree_node GTY((tag ("0"), | |
72 | desc ("tree_node_structure (&%h)"))) generic; | |
73 | struct lang_identifier GTY((tag ("1"))) identifier; | |
74 | }; | |
75 | ||
76 | /* We don't use language_function. */ | |
77 | ||
78 | struct GTY(()) language_function | |
79 | { | |
80 | int dummy; | |
81 | }; | |
82 | ||
83 | /* Language hooks. */ | |
84 | ||
85 | static bool | |
86 | go_langhook_init (void) | |
87 | { | |
88 | build_common_tree_nodes (false); | |
89 | ||
90 | /* The sizetype may be "unsigned long" or "unsigned long long". */ | |
91 | if (TYPE_MODE (long_unsigned_type_node) == ptr_mode) | |
92 | size_type_node = long_unsigned_type_node; | |
93 | else if (TYPE_MODE (long_long_unsigned_type_node) == ptr_mode) | |
94 | size_type_node = long_long_unsigned_type_node; | |
95 | else | |
96 | size_type_node = long_unsigned_type_node; | |
97 | set_sizetype (size_type_node); | |
98 | ||
99 | build_common_tree_nodes_2 (0); | |
100 | ||
101 | /* We must create the gogo IR after calling build_common_tree_nodes | |
102 | (because Gogo::define_builtin_function_trees refers indirectly | |
103 | to, e.g., unsigned_char_type_node) but before calling | |
104 | build_common_builtin_nodes (because it calls, indirectly, | |
105 | go_type_for_size). */ | |
ff5f50c5 | 106 | go_create_gogo (INT_TYPE_SIZE, POINTER_SIZE); |
7a938933 ILT |
107 | |
108 | build_common_builtin_nodes (); | |
109 | ||
110 | /* I don't know why this is not done by any of the above. */ | |
111 | void_list_node = build_tree_list (NULL_TREE, void_type_node); | |
112 | ||
113 | /* The default precision for floating point numbers. This is used | |
114 | for floating point constants with abstract type. This may | |
115 | eventually be controllable by a command line option. */ | |
116 | mpfr_set_default_prec (128); | |
117 | ||
118 | /* Go uses exceptions. */ | |
119 | using_eh_for_cleanups (); | |
120 | ||
121 | return true; | |
122 | } | |
123 | ||
124 | /* The option mask. */ | |
125 | ||
126 | static unsigned int | |
127 | go_langhook_option_lang_mask (void) | |
128 | { | |
129 | return CL_Go; | |
130 | } | |
131 | ||
132 | /* Initialize the options structure. */ | |
133 | ||
134 | static void | |
135 | go_langhook_init_options_struct (struct gcc_options *opts) | |
136 | { | |
137 | /* Go says that signed overflow is precisely defined. */ | |
138 | opts->x_flag_wrapv = 1; | |
139 | ||
140 | /* We default to using strict aliasing, since Go pointers are safe. | |
141 | This is turned off for code that imports the "unsafe" package, | |
142 | because using unsafe.pointer violates C style aliasing | |
143 | requirements. */ | |
144 | opts->x_flag_strict_aliasing = 1; | |
145 | ||
146 | /* Default to avoiding range issues for complex multiply and | |
147 | divide. */ | |
148 | opts->x_flag_complex_method = 2; | |
149 | ||
150 | /* The builtin math functions should not set errno. */ | |
151 | opts->x_flag_errno_math = 0; | |
9b548472 | 152 | opts->frontend_set_flag_errno_math = true; |
7a938933 ILT |
153 | |
154 | /* We turn on stack splitting if we can. */ | |
155 | if (targetm.supports_split_stack (false, opts)) | |
156 | opts->x_flag_split_stack = 1; | |
157 | ||
158 | /* Exceptions are used to handle recovering from panics. */ | |
159 | opts->x_flag_exceptions = 1; | |
160 | opts->x_flag_non_call_exceptions = 1; | |
161 | } | |
162 | ||
ac819ba5 ILT |
163 | /* Infrastructure for a VEC of char * pointers. */ |
164 | ||
165 | typedef const char *go_char_p; | |
166 | DEF_VEC_P(go_char_p); | |
167 | DEF_VEC_ALLOC_P(go_char_p, heap); | |
168 | ||
169 | /* The list of directories to search after all the Go specific | |
170 | directories have been searched. */ | |
171 | ||
172 | static VEC(go_char_p, heap) *go_search_dirs; | |
173 | ||
7a938933 ILT |
174 | /* Handle Go specific options. Return 0 if we didn't do anything. */ |
175 | ||
176 | static bool | |
177 | go_langhook_handle_option ( | |
178 | size_t scode, | |
179 | const char *arg, | |
180 | int value ATTRIBUTE_UNUSED, | |
181 | int kind ATTRIBUTE_UNUSED, | |
182 | location_t loc ATTRIBUTE_UNUSED, | |
183 | const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED) | |
184 | { | |
185 | enum opt_code code = (enum opt_code) scode; | |
186 | bool ret = true; | |
187 | ||
188 | switch (code) | |
189 | { | |
190 | case OPT_I: | |
7a938933 ILT |
191 | go_add_search_path (arg); |
192 | break; | |
193 | ||
ac819ba5 ILT |
194 | case OPT_L: |
195 | /* A -L option is assumed to come from the compiler driver. | |
196 | This is a system directory. We search the following | |
197 | directories, if they exist, before this one: | |
198 | dir/go/VERSION | |
199 | dir/go/VERSION/MACHINE | |
200 | This is like include/c++. */ | |
201 | { | |
202 | static const char dir_separator_str[] = { DIR_SEPARATOR, 0 }; | |
203 | size_t len; | |
204 | char *p; | |
205 | struct stat st; | |
206 | ||
207 | len = strlen (arg); | |
208 | p = XALLOCAVEC (char, | |
209 | (len + sizeof "go" + sizeof DEFAULT_TARGET_VERSION | |
210 | + sizeof DEFAULT_TARGET_MACHINE + 3)); | |
211 | strcpy (p, arg); | |
212 | if (len > 0 && !IS_DIR_SEPARATOR (p[len - 1])) | |
213 | strcat (p, dir_separator_str); | |
214 | strcat (p, "go"); | |
215 | strcat (p, dir_separator_str); | |
216 | strcat (p, DEFAULT_TARGET_VERSION); | |
217 | if (stat (p, &st) == 0 && S_ISDIR (st.st_mode)) | |
218 | { | |
219 | go_add_search_path (p); | |
220 | strcat (p, dir_separator_str); | |
221 | strcat (p, DEFAULT_TARGET_MACHINE); | |
222 | if (stat (p, &st) == 0 && S_ISDIR (st.st_mode)) | |
223 | go_add_search_path (p); | |
224 | } | |
225 | ||
226 | /* Search ARG too, but only after we've searched to Go | |
227 | specific directories for all -L arguments. */ | |
228 | VEC_safe_push (go_char_p, heap, go_search_dirs, arg); | |
229 | } | |
230 | break; | |
231 | ||
7a938933 ILT |
232 | case OPT_fgo_dump_: |
233 | ret = go_enable_dump (arg) ? true : false; | |
234 | break; | |
235 | ||
236 | case OPT_fgo_prefix_: | |
237 | go_set_prefix (arg); | |
238 | break; | |
239 | ||
240 | default: | |
241 | /* Just return 1 to indicate that the option is valid. */ | |
242 | break; | |
243 | } | |
244 | ||
245 | return ret; | |
246 | } | |
247 | ||
248 | /* Run after parsing options. */ | |
249 | ||
250 | static bool | |
251 | go_langhook_post_options (const char **pfilename ATTRIBUTE_UNUSED) | |
252 | { | |
ac819ba5 ILT |
253 | unsigned int ix; |
254 | const char *dir; | |
255 | ||
7a938933 ILT |
256 | gcc_assert (num_in_fnames > 0); |
257 | ||
ac819ba5 ILT |
258 | FOR_EACH_VEC_ELT (go_char_p, go_search_dirs, ix, dir) |
259 | go_add_search_path (dir); | |
260 | VEC_free (go_char_p, heap, go_search_dirs); | |
261 | go_search_dirs = NULL; | |
262 | ||
7a938933 ILT |
263 | if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT) |
264 | flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD; | |
265 | ||
266 | /* Returning false means that the backend should be used. */ | |
267 | return false; | |
268 | } | |
269 | ||
270 | static void | |
271 | go_langhook_parse_file (void) | |
272 | { | |
273 | go_parse_input_files (in_fnames, num_in_fnames, flag_syntax_only, | |
274 | go_require_return_statement); | |
275 | } | |
276 | ||
277 | static tree | |
278 | go_langhook_type_for_size (unsigned int bits, int unsignedp) | |
279 | { | |
280 | return go_type_for_size (bits, unsignedp); | |
281 | } | |
282 | ||
283 | static tree | |
284 | go_langhook_type_for_mode (enum machine_mode mode, int unsignedp) | |
285 | { | |
0e29f7e5 ILT |
286 | /* Go has no vector types. Build them here. FIXME: It does not |
287 | make sense for the middle-end to ask the frontend for a type | |
288 | which the frontend does not support. However, at least for now | |
289 | it is required. See PR 46805. */ | |
290 | if (VECTOR_MODE_P (mode)) | |
291 | { | |
292 | tree inner; | |
293 | ||
294 | inner = go_langhook_type_for_mode (GET_MODE_INNER (mode), unsignedp); | |
295 | if (inner != NULL_TREE) | |
296 | return build_vector_type_for_mode (inner, mode); | |
297 | return NULL_TREE; | |
298 | } | |
299 | ||
7a938933 ILT |
300 | return go_type_for_mode (mode, unsignedp); |
301 | } | |
302 | ||
303 | /* Record a builtin function. We just ignore builtin functions. */ | |
304 | ||
305 | static tree | |
306 | go_langhook_builtin_function (tree decl) | |
307 | { | |
308 | return decl; | |
309 | } | |
310 | ||
311 | static int | |
312 | go_langhook_global_bindings_p (void) | |
313 | { | |
314 | return current_function_decl == NULL ? 1 : 0; | |
315 | } | |
316 | ||
317 | /* Push a declaration into the current binding level. We can't | |
318 | usefully implement this since we don't want to convert from tree | |
319 | back to one of our internal data structures. I think the only way | |
320 | this is used is to record a decl which is to be returned by | |
321 | getdecls, and we could implement it for that purpose if | |
322 | necessary. */ | |
323 | ||
324 | static tree | |
325 | go_langhook_pushdecl (tree decl ATTRIBUTE_UNUSED) | |
326 | { | |
327 | gcc_unreachable (); | |
328 | } | |
329 | ||
330 | /* This hook is used to get the current list of declarations as trees. | |
331 | We don't support that; instead we use the write_globals hook. This | |
332 | can't simply crash because it is called by -gstabs. */ | |
333 | ||
334 | static tree | |
335 | go_langhook_getdecls (void) | |
336 | { | |
337 | return NULL; | |
338 | } | |
339 | ||
340 | /* Write out globals. */ | |
341 | ||
342 | static void | |
343 | go_langhook_write_globals (void) | |
344 | { | |
345 | go_write_globals (); | |
346 | } | |
347 | ||
348 | /* Go specific gimplification. We need to gimplify | |
349 | CALL_EXPR_STATIC_CHAIN, because the gimplifier doesn't handle | |
350 | it. */ | |
351 | ||
352 | static int | |
353 | go_langhook_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p) | |
354 | { | |
355 | if (TREE_CODE (*expr_p) == CALL_EXPR | |
356 | && CALL_EXPR_STATIC_CHAIN (*expr_p) != NULL_TREE) | |
357 | gimplify_expr (&CALL_EXPR_STATIC_CHAIN (*expr_p), pre_p, post_p, | |
358 | is_gimple_val, fb_rvalue); | |
359 | return GS_UNHANDLED; | |
360 | } | |
361 | ||
362 | /* Return a decl for the exception personality function. The function | |
363 | itself is implemented in libgo/runtime/go-unwind.c. */ | |
364 | ||
365 | static tree | |
366 | go_langhook_eh_personality (void) | |
367 | { | |
368 | static tree personality_decl; | |
369 | if (personality_decl == NULL_TREE) | |
370 | { | |
371 | personality_decl = build_personality_function ("gccgo"); | |
372 | go_preserve_from_gc (personality_decl); | |
373 | } | |
374 | return personality_decl; | |
375 | } | |
376 | ||
377 | /* Functions called directly by the generic backend. */ | |
378 | ||
379 | tree | |
380 | convert (tree type, tree expr) | |
381 | { | |
382 | if (type == error_mark_node | |
383 | || expr == error_mark_node | |
384 | || TREE_TYPE (expr) == error_mark_node) | |
385 | return error_mark_node; | |
386 | ||
387 | if (type == TREE_TYPE (expr)) | |
388 | return expr; | |
389 | ||
390 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr))) | |
391 | return fold_convert (type, expr); | |
392 | ||
393 | switch (TREE_CODE (type)) | |
394 | { | |
395 | case VOID_TYPE: | |
396 | case BOOLEAN_TYPE: | |
397 | return fold_convert (type, expr); | |
398 | case INTEGER_TYPE: | |
399 | return fold (convert_to_integer (type, expr)); | |
400 | case POINTER_TYPE: | |
401 | return fold (convert_to_pointer (type, expr)); | |
402 | case REAL_TYPE: | |
403 | return fold (convert_to_real (type, expr)); | |
404 | case COMPLEX_TYPE: | |
405 | return fold (convert_to_complex (type, expr)); | |
406 | default: | |
407 | break; | |
408 | } | |
409 | ||
410 | gcc_unreachable (); | |
411 | } | |
412 | ||
413 | /* FIXME: This is a hack to preserve trees that we create from the | |
414 | garbage collector. */ | |
415 | ||
416 | static GTY(()) tree go_gc_root; | |
417 | ||
418 | void | |
419 | go_preserve_from_gc (tree t) | |
420 | { | |
421 | go_gc_root = tree_cons (NULL_TREE, t, go_gc_root); | |
422 | } | |
423 | ||
424 | /* Convert an identifier for use in an error message. */ | |
425 | ||
426 | const char * | |
427 | go_localize_identifier (const char *ident) | |
428 | { | |
429 | return identifier_to_locale (ident); | |
430 | } | |
431 | ||
432 | #undef LANG_HOOKS_NAME | |
433 | #undef LANG_HOOKS_INIT | |
434 | #undef LANG_HOOKS_OPTION_LANG_MASK | |
435 | #undef LANG_HOOKS_INIT_OPTIONS_STRUCT | |
436 | #undef LANG_HOOKS_HANDLE_OPTION | |
437 | #undef LANG_HOOKS_POST_OPTIONS | |
438 | #undef LANG_HOOKS_PARSE_FILE | |
439 | #undef LANG_HOOKS_TYPE_FOR_MODE | |
440 | #undef LANG_HOOKS_TYPE_FOR_SIZE | |
441 | #undef LANG_HOOKS_BUILTIN_FUNCTION | |
442 | #undef LANG_HOOKS_GLOBAL_BINDINGS_P | |
443 | #undef LANG_HOOKS_PUSHDECL | |
444 | #undef LANG_HOOKS_GETDECLS | |
445 | #undef LANG_HOOKS_WRITE_GLOBALS | |
446 | #undef LANG_HOOKS_GIMPLIFY_EXPR | |
447 | #undef LANG_HOOKS_EH_PERSONALITY | |
448 | ||
449 | #define LANG_HOOKS_NAME "GNU Go" | |
450 | #define LANG_HOOKS_INIT go_langhook_init | |
451 | #define LANG_HOOKS_OPTION_LANG_MASK go_langhook_option_lang_mask | |
452 | #define LANG_HOOKS_INIT_OPTIONS_STRUCT go_langhook_init_options_struct | |
453 | #define LANG_HOOKS_HANDLE_OPTION go_langhook_handle_option | |
454 | #define LANG_HOOKS_POST_OPTIONS go_langhook_post_options | |
455 | #define LANG_HOOKS_PARSE_FILE go_langhook_parse_file | |
456 | #define LANG_HOOKS_TYPE_FOR_MODE go_langhook_type_for_mode | |
457 | #define LANG_HOOKS_TYPE_FOR_SIZE go_langhook_type_for_size | |
458 | #define LANG_HOOKS_BUILTIN_FUNCTION go_langhook_builtin_function | |
459 | #define LANG_HOOKS_GLOBAL_BINDINGS_P go_langhook_global_bindings_p | |
460 | #define LANG_HOOKS_PUSHDECL go_langhook_pushdecl | |
461 | #define LANG_HOOKS_GETDECLS go_langhook_getdecls | |
462 | #define LANG_HOOKS_WRITE_GLOBALS go_langhook_write_globals | |
463 | #define LANG_HOOKS_GIMPLIFY_EXPR go_langhook_gimplify_expr | |
464 | #define LANG_HOOKS_EH_PERSONALITY go_langhook_eh_personality | |
465 | ||
466 | struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER; | |
467 | ||
468 | #include "gt-go-go-lang.h" | |
469 | #include "gtype-go.h" |