1 /* go-lang.c -- Go frontend gcc interface.
2 Copyright (C) 2009-2014 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"
26 #include "basic-block.h"
27 #include "gimple-expr.h"
29 #include "stor-layout.h"
35 #include "diagnostic.h"
36 #include "langhooks.h"
37 #include "langhooks-def.h"
39 #include "common/common-target.h"
45 /* Language-dependent contents of a type. */
47 struct GTY(()) lang_type
52 /* Language-dependent contents of a decl. */
54 struct GTY((variable_size
)) lang_decl
59 /* Language-dependent contents of an identifier. This must include a
62 struct GTY(()) lang_identifier
64 struct tree_identifier common
;
67 /* The resulting tree type. */
69 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
70 chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL")))
73 union tree_node
GTY((tag ("0"),
74 desc ("tree_node_structure (&%h)"))) generic
;
75 struct lang_identifier
GTY((tag ("1"))) identifier
;
78 /* We don't use language_function. */
80 struct GTY(()) language_function
85 /* Option information we need to pass to go_create_gogo. */
87 static const char *go_pkgpath
= NULL
;
88 static const char *go_prefix
= NULL
;
89 static const char *go_relative_import_path
= NULL
;
94 go_langhook_init (void)
96 build_common_tree_nodes (false, false);
98 /* I don't know why this has to be done explicitly. */
99 void_list_node
= build_tree_list (NULL_TREE
, void_type_node
);
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
, go_pkgpath
, go_prefix
,
107 go_relative_import_path
);
109 build_common_builtin_nodes ();
111 /* The default precision for floating point numbers. This is used
112 for floating point constants with abstract type. This may
113 eventually be controllable by a command line option. */
114 mpfr_set_default_prec (256);
116 /* Go uses exceptions. */
117 using_eh_for_cleanups ();
122 /* The option mask. */
125 go_langhook_option_lang_mask (void)
130 /* Initialize the options structure. */
133 go_langhook_init_options_struct (struct gcc_options
*opts
)
135 /* Go says that signed overflow is precisely defined. */
136 opts
->x_flag_wrapv
= 1;
138 /* We default to using strict aliasing, since Go pointers are safe.
139 This is turned off for code that imports the "unsafe" package,
140 because using unsafe.pointer violates C style aliasing
142 opts
->x_flag_strict_aliasing
= 1;
144 /* Default to avoiding range issues for complex multiply and
146 opts
->x_flag_complex_method
= 2;
148 /* The builtin math functions should not set errno. */
149 opts
->x_flag_errno_math
= 0;
150 opts
->frontend_set_flag_errno_math
= true;
152 /* We turn on stack splitting if we can. */
153 if (targetm_common
.supports_split_stack (false, opts
))
154 opts
->x_flag_split_stack
= 1;
156 /* Exceptions are used to handle recovering from panics. */
157 opts
->x_flag_exceptions
= 1;
158 opts
->x_flag_non_call_exceptions
= 1;
161 /* Infrastructure for a vector of char * pointers. */
163 typedef const char *go_char_p
;
165 /* The list of directories to search after all the Go specific
166 directories have been searched. */
168 static vec
<go_char_p
> go_search_dirs
;
170 /* Handle Go specific options. Return 0 if we didn't do anything. */
173 go_langhook_handle_option (
176 int value ATTRIBUTE_UNUSED
,
177 int kind ATTRIBUTE_UNUSED
,
178 location_t loc ATTRIBUTE_UNUSED
,
179 const struct cl_option_handlers
*handlers ATTRIBUTE_UNUSED
)
181 enum opt_code code
= (enum opt_code
) scode
;
187 go_add_search_path (arg
);
191 /* A -L option is assumed to come from the compiler driver.
192 This is a system directory. We search the following
193 directories, if they exist, before this one:
195 dir/go/VERSION/MACHINE
196 This is like include/c++. */
198 static const char dir_separator_str
[] = { DIR_SEPARATOR
, 0 };
204 p
= XALLOCAVEC (char,
205 (len
+ sizeof "go" + sizeof DEFAULT_TARGET_VERSION
206 + sizeof DEFAULT_TARGET_MACHINE
+ 3));
208 if (len
> 0 && !IS_DIR_SEPARATOR (p
[len
- 1]))
209 strcat (p
, dir_separator_str
);
211 strcat (p
, dir_separator_str
);
212 strcat (p
, DEFAULT_TARGET_VERSION
);
213 if (stat (p
, &st
) == 0 && S_ISDIR (st
.st_mode
))
215 go_add_search_path (p
);
216 strcat (p
, dir_separator_str
);
217 strcat (p
, DEFAULT_TARGET_MACHINE
);
218 if (stat (p
, &st
) == 0 && S_ISDIR (st
.st_mode
))
219 go_add_search_path (p
);
222 /* Search ARG too, but only after we've searched to Go
223 specific directories for all -L arguments. */
224 go_search_dirs
.safe_push (arg
);
229 ret
= go_enable_dump (arg
) ? true : false;
232 case OPT_fgo_optimize_
:
233 ret
= go_enable_optimize (arg
) ? true : false;
236 case OPT_fgo_pkgpath_
:
240 case OPT_fgo_prefix_
:
244 case OPT_fgo_relative_import_path_
:
245 go_relative_import_path
= arg
;
249 /* Just return 1 to indicate that the option is valid. */
256 /* Run after parsing options. */
259 go_langhook_post_options (const char **pfilename ATTRIBUTE_UNUSED
)
264 gcc_assert (num_in_fnames
> 0);
266 FOR_EACH_VEC_ELT (go_search_dirs
, ix
, dir
)
267 go_add_search_path (dir
);
268 go_search_dirs
.release ();
270 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
271 flag_excess_precision_cmdline
= EXCESS_PRECISION_STANDARD
;
273 /* Tail call optimizations can confuse uses of runtime.Callers. */
274 if (!global_options_set
.x_flag_optimize_sibling_calls
)
275 global_options
.x_flag_optimize_sibling_calls
= 0;
277 /* Returning false means that the backend should be used. */
282 go_langhook_parse_file (void)
284 go_parse_input_files (in_fnames
, num_in_fnames
, flag_syntax_only
,
285 go_require_return_statement
);
289 go_langhook_type_for_size (unsigned int bits
, int unsignedp
)
291 return go_type_for_size (bits
, unsignedp
);
295 go_langhook_type_for_mode (enum machine_mode mode
, int unsignedp
)
298 /* Go has no vector types. Build them here. FIXME: It does not
299 make sense for the middle-end to ask the frontend for a type
300 which the frontend does not support. However, at least for now
301 it is required. See PR 46805. */
302 if (VECTOR_MODE_P (mode
))
306 inner
= go_langhook_type_for_mode (GET_MODE_INNER (mode
), unsignedp
);
307 if (inner
!= NULL_TREE
)
308 return build_vector_type_for_mode (inner
, mode
);
312 type
= go_type_for_mode (mode
, unsignedp
);
316 #if HOST_BITS_PER_WIDE_INT >= 64
317 /* The middle-end and some backends rely on TImode being supported
321 type
= build_nonstandard_integer_type (GET_MODE_BITSIZE (TImode
),
323 if (type
&& TYPE_MODE (type
) == TImode
)
330 /* Record a builtin function. We just ignore builtin functions. */
333 go_langhook_builtin_function (tree decl
)
338 /* Return true if we are in the global binding level. */
341 go_langhook_global_bindings_p (void)
343 return current_function_decl
== NULL_TREE
;
346 /* Push a declaration into the current binding level. We can't
347 usefully implement this since we don't want to convert from tree
348 back to one of our internal data structures. I think the only way
349 this is used is to record a decl which is to be returned by
350 getdecls, and we could implement it for that purpose if
354 go_langhook_pushdecl (tree decl ATTRIBUTE_UNUSED
)
359 /* This hook is used to get the current list of declarations as trees.
360 We don't support that; instead we use the write_globals hook. This
361 can't simply crash because it is called by -gstabs. */
364 go_langhook_getdecls (void)
369 /* Write out globals. */
372 go_langhook_write_globals (void)
377 /* Go specific gimplification. We need to gimplify
378 CALL_EXPR_STATIC_CHAIN, because the gimplifier doesn't handle
382 go_langhook_gimplify_expr (tree
*expr_p
, gimple_seq
*pre_p
, gimple_seq
*post_p
)
384 if (TREE_CODE (*expr_p
) == CALL_EXPR
385 && CALL_EXPR_STATIC_CHAIN (*expr_p
) != NULL_TREE
)
386 gimplify_expr (&CALL_EXPR_STATIC_CHAIN (*expr_p
), pre_p
, post_p
,
387 is_gimple_val
, fb_rvalue
);
391 /* Return a decl for the exception personality function. The function
392 itself is implemented in libgo/runtime/go-unwind.c. */
395 go_langhook_eh_personality (void)
397 static tree personality_decl
;
398 if (personality_decl
== NULL_TREE
)
400 personality_decl
= build_personality_function ("gccgo");
401 go_preserve_from_gc (personality_decl
);
403 return personality_decl
;
406 /* Functions called directly by the generic backend. */
409 convert (tree type
, tree expr
)
411 if (type
== error_mark_node
412 || expr
== error_mark_node
413 || TREE_TYPE (expr
) == error_mark_node
)
414 return error_mark_node
;
416 if (type
== TREE_TYPE (expr
))
419 if (TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (TREE_TYPE (expr
)))
420 return fold_convert (type
, expr
);
422 switch (TREE_CODE (type
))
426 return fold_convert (type
, expr
);
428 return fold (convert_to_integer (type
, expr
));
430 return fold (convert_to_pointer (type
, expr
));
432 return fold (convert_to_real (type
, expr
));
434 return fold (convert_to_complex (type
, expr
));
442 /* FIXME: This is a hack to preserve trees that we create from the
443 garbage collector. */
445 static GTY(()) tree go_gc_root
;
448 go_preserve_from_gc (tree t
)
450 go_gc_root
= tree_cons (NULL_TREE
, t
, go_gc_root
);
453 /* Convert an identifier for use in an error message. */
456 go_localize_identifier (const char *ident
)
458 return identifier_to_locale (ident
);
461 #undef LANG_HOOKS_NAME
462 #undef LANG_HOOKS_INIT
463 #undef LANG_HOOKS_OPTION_LANG_MASK
464 #undef LANG_HOOKS_INIT_OPTIONS_STRUCT
465 #undef LANG_HOOKS_HANDLE_OPTION
466 #undef LANG_HOOKS_POST_OPTIONS
467 #undef LANG_HOOKS_PARSE_FILE
468 #undef LANG_HOOKS_TYPE_FOR_MODE
469 #undef LANG_HOOKS_TYPE_FOR_SIZE
470 #undef LANG_HOOKS_BUILTIN_FUNCTION
471 #undef LANG_HOOKS_GLOBAL_BINDINGS_P
472 #undef LANG_HOOKS_PUSHDECL
473 #undef LANG_HOOKS_GETDECLS
474 #undef LANG_HOOKS_WRITE_GLOBALS
475 #undef LANG_HOOKS_GIMPLIFY_EXPR
476 #undef LANG_HOOKS_EH_PERSONALITY
478 #define LANG_HOOKS_NAME "GNU Go"
479 #define LANG_HOOKS_INIT go_langhook_init
480 #define LANG_HOOKS_OPTION_LANG_MASK go_langhook_option_lang_mask
481 #define LANG_HOOKS_INIT_OPTIONS_STRUCT go_langhook_init_options_struct
482 #define LANG_HOOKS_HANDLE_OPTION go_langhook_handle_option
483 #define LANG_HOOKS_POST_OPTIONS go_langhook_post_options
484 #define LANG_HOOKS_PARSE_FILE go_langhook_parse_file
485 #define LANG_HOOKS_TYPE_FOR_MODE go_langhook_type_for_mode
486 #define LANG_HOOKS_TYPE_FOR_SIZE go_langhook_type_for_size
487 #define LANG_HOOKS_BUILTIN_FUNCTION go_langhook_builtin_function
488 #define LANG_HOOKS_GLOBAL_BINDINGS_P go_langhook_global_bindings_p
489 #define LANG_HOOKS_PUSHDECL go_langhook_pushdecl
490 #define LANG_HOOKS_GETDECLS go_langhook_getdecls
491 #define LANG_HOOKS_WRITE_GLOBALS go_langhook_write_globals
492 #define LANG_HOOKS_GIMPLIFY_EXPR go_langhook_gimplify_expr
493 #define LANG_HOOKS_EH_PERSONALITY go_langhook_eh_personality
495 struct lang_hooks lang_hooks
= LANG_HOOKS_INITIALIZER
;
497 #include "gt-go-go-lang.h"
498 #include "gtype-go.h"