1 /* go-lang.c -- Go frontend gcc interface.
2 Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc.
4 This file is part of GCC.
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
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
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/>. */
23 #include "coretypes.h"
33 #include "diagnostic.h"
34 #include "langhooks.h"
35 #include "langhooks-def.h"
43 /* Language-dependent contents of a type. */
45 struct GTY(()) lang_type
50 /* Language-dependent contents of a decl. */
52 struct GTY(()) lang_decl
57 /* Language-dependent contents of an identifier. This must include a
60 struct GTY(()) lang_identifier
62 struct tree_identifier common
;
65 /* The resulting tree type. */
67 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
68 chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL")))
71 union tree_node
GTY((tag ("0"),
72 desc ("tree_node_structure (&%h)"))) generic
;
73 struct lang_identifier
GTY((tag ("1"))) identifier
;
76 /* We don't use language_function. */
78 struct GTY(()) language_function
86 go_langhook_init (void)
88 build_common_tree_nodes (false);
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
;
96 size_type_node
= long_unsigned_type_node
;
97 set_sizetype (size_type_node
);
99 build_common_tree_nodes_2 (0);
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). */
106 go_create_gogo (INT_TYPE_SIZE
, POINTER_SIZE
);
108 build_common_builtin_nodes ();
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
);
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);
118 /* Go uses exceptions. */
119 using_eh_for_cleanups ();
124 /* The option mask. */
127 go_langhook_option_lang_mask (void)
132 /* Initialize the options structure. */
135 go_langhook_init_options_struct (struct gcc_options
*opts
)
137 /* Go says that signed overflow is precisely defined. */
138 opts
->x_flag_wrapv
= 1;
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
144 opts
->x_flag_strict_aliasing
= 1;
146 /* Default to avoiding range issues for complex multiply and
148 opts
->x_flag_complex_method
= 2;
150 /* The builtin math functions should not set errno. */
151 opts
->x_flag_errno_math
= 0;
152 opts
->frontend_set_flag_errno_math
= true;
154 /* We turn on stack splitting if we can. */
155 if (targetm
.supports_split_stack (false, opts
))
156 opts
->x_flag_split_stack
= 1;
158 /* Exceptions are used to handle recovering from panics. */
159 opts
->x_flag_exceptions
= 1;
160 opts
->x_flag_non_call_exceptions
= 1;
163 /* Infrastructure for a VEC of char * pointers. */
165 typedef const char *go_char_p
;
166 DEF_VEC_P(go_char_p
);
167 DEF_VEC_ALLOC_P(go_char_p
, heap
);
169 /* The list of directories to search after all the Go specific
170 directories have been searched. */
172 static VEC(go_char_p
, heap
) *go_search_dirs
;
174 /* Handle Go specific options. Return 0 if we didn't do anything. */
177 go_langhook_handle_option (
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
)
185 enum opt_code code
= (enum opt_code
) scode
;
191 go_add_search_path (arg
);
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:
199 dir/go/VERSION/MACHINE
200 This is like include/c++. */
202 static const char dir_separator_str
[] = { DIR_SEPARATOR
, 0 };
208 p
= XALLOCAVEC (char,
209 (len
+ sizeof "go" + sizeof DEFAULT_TARGET_VERSION
210 + sizeof DEFAULT_TARGET_MACHINE
+ 3));
212 if (len
> 0 && !IS_DIR_SEPARATOR (p
[len
- 1]))
213 strcat (p
, dir_separator_str
);
215 strcat (p
, dir_separator_str
);
216 strcat (p
, DEFAULT_TARGET_VERSION
);
217 if (stat (p
, &st
) == 0 && S_ISDIR (st
.st_mode
))
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
);
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
);
233 ret
= go_enable_dump (arg
) ? true : false;
236 case OPT_fgo_prefix_
:
241 /* Just return 1 to indicate that the option is valid. */
248 /* Run after parsing options. */
251 go_langhook_post_options (const char **pfilename ATTRIBUTE_UNUSED
)
256 gcc_assert (num_in_fnames
> 0);
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
;
263 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
264 flag_excess_precision_cmdline
= EXCESS_PRECISION_STANDARD
;
266 /* Returning false means that the backend should be used. */
271 go_langhook_parse_file (void)
273 go_parse_input_files (in_fnames
, num_in_fnames
, flag_syntax_only
,
274 go_require_return_statement
);
278 go_langhook_type_for_size (unsigned int bits
, int unsignedp
)
280 return go_type_for_size (bits
, unsignedp
);
284 go_langhook_type_for_mode (enum machine_mode mode
, int unsignedp
)
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
))
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
);
300 return go_type_for_mode (mode
, unsignedp
);
303 /* Record a builtin function. We just ignore builtin functions. */
306 go_langhook_builtin_function (tree decl
)
311 /* Return true if we are in the global binding level. */
314 go_langhook_global_bindings_p (void)
316 return current_function_decl
== NULL_TREE
;
319 /* Push a declaration into the current binding level. We can't
320 usefully implement this since we don't want to convert from tree
321 back to one of our internal data structures. I think the only way
322 this is used is to record a decl which is to be returned by
323 getdecls, and we could implement it for that purpose if
327 go_langhook_pushdecl (tree decl ATTRIBUTE_UNUSED
)
332 /* This hook is used to get the current list of declarations as trees.
333 We don't support that; instead we use the write_globals hook. This
334 can't simply crash because it is called by -gstabs. */
337 go_langhook_getdecls (void)
342 /* Write out globals. */
345 go_langhook_write_globals (void)
350 /* Go specific gimplification. We need to gimplify
351 CALL_EXPR_STATIC_CHAIN, because the gimplifier doesn't handle
355 go_langhook_gimplify_expr (tree
*expr_p
, gimple_seq
*pre_p
, gimple_seq
*post_p
)
357 if (TREE_CODE (*expr_p
) == CALL_EXPR
358 && CALL_EXPR_STATIC_CHAIN (*expr_p
) != NULL_TREE
)
359 gimplify_expr (&CALL_EXPR_STATIC_CHAIN (*expr_p
), pre_p
, post_p
,
360 is_gimple_val
, fb_rvalue
);
364 /* Return a decl for the exception personality function. The function
365 itself is implemented in libgo/runtime/go-unwind.c. */
368 go_langhook_eh_personality (void)
370 static tree personality_decl
;
371 if (personality_decl
== NULL_TREE
)
373 personality_decl
= build_personality_function ("gccgo");
374 go_preserve_from_gc (personality_decl
);
376 return personality_decl
;
379 /* Functions called directly by the generic backend. */
382 convert (tree type
, tree expr
)
384 if (type
== error_mark_node
385 || expr
== error_mark_node
386 || TREE_TYPE (expr
) == error_mark_node
)
387 return error_mark_node
;
389 if (type
== TREE_TYPE (expr
))
392 if (TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (TREE_TYPE (expr
)))
393 return fold_convert (type
, expr
);
395 switch (TREE_CODE (type
))
399 return fold_convert (type
, expr
);
401 return fold (convert_to_integer (type
, expr
));
403 return fold (convert_to_pointer (type
, expr
));
405 return fold (convert_to_real (type
, expr
));
407 return fold (convert_to_complex (type
, expr
));
415 /* FIXME: This is a hack to preserve trees that we create from the
416 garbage collector. */
418 static GTY(()) tree go_gc_root
;
421 go_preserve_from_gc (tree t
)
423 go_gc_root
= tree_cons (NULL_TREE
, t
, go_gc_root
);
426 /* Convert an identifier for use in an error message. */
429 go_localize_identifier (const char *ident
)
431 return identifier_to_locale (ident
);
434 #undef LANG_HOOKS_NAME
435 #undef LANG_HOOKS_INIT
436 #undef LANG_HOOKS_OPTION_LANG_MASK
437 #undef LANG_HOOKS_INIT_OPTIONS_STRUCT
438 #undef LANG_HOOKS_HANDLE_OPTION
439 #undef LANG_HOOKS_POST_OPTIONS
440 #undef LANG_HOOKS_PARSE_FILE
441 #undef LANG_HOOKS_TYPE_FOR_MODE
442 #undef LANG_HOOKS_TYPE_FOR_SIZE
443 #undef LANG_HOOKS_BUILTIN_FUNCTION
444 #undef LANG_HOOKS_GLOBAL_BINDINGS_P
445 #undef LANG_HOOKS_PUSHDECL
446 #undef LANG_HOOKS_GETDECLS
447 #undef LANG_HOOKS_WRITE_GLOBALS
448 #undef LANG_HOOKS_GIMPLIFY_EXPR
449 #undef LANG_HOOKS_EH_PERSONALITY
451 #define LANG_HOOKS_NAME "GNU Go"
452 #define LANG_HOOKS_INIT go_langhook_init
453 #define LANG_HOOKS_OPTION_LANG_MASK go_langhook_option_lang_mask
454 #define LANG_HOOKS_INIT_OPTIONS_STRUCT go_langhook_init_options_struct
455 #define LANG_HOOKS_HANDLE_OPTION go_langhook_handle_option
456 #define LANG_HOOKS_POST_OPTIONS go_langhook_post_options
457 #define LANG_HOOKS_PARSE_FILE go_langhook_parse_file
458 #define LANG_HOOKS_TYPE_FOR_MODE go_langhook_type_for_mode
459 #define LANG_HOOKS_TYPE_FOR_SIZE go_langhook_type_for_size
460 #define LANG_HOOKS_BUILTIN_FUNCTION go_langhook_builtin_function
461 #define LANG_HOOKS_GLOBAL_BINDINGS_P go_langhook_global_bindings_p
462 #define LANG_HOOKS_PUSHDECL go_langhook_pushdecl
463 #define LANG_HOOKS_GETDECLS go_langhook_getdecls
464 #define LANG_HOOKS_WRITE_GLOBALS go_langhook_write_globals
465 #define LANG_HOOKS_GIMPLIFY_EXPR go_langhook_gimplify_expr
466 #define LANG_HOOKS_EH_PERSONALITY go_langhook_eh_personality
468 struct lang_hooks lang_hooks
= LANG_HOOKS_INITIALIZER
;
470 #include "gt-go-go-lang.h"
471 #include "gtype-go.h"