1 /* go-lang.c -- Go frontend gcc interface.
2 Copyright (C) 2009, 2010, 2011, 2012 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"
38 #include "common/common-target.h"
44 /* Language-dependent contents of a type. */
46 struct GTY(()) lang_type
51 /* Language-dependent contents of a decl. */
53 struct GTY(()) lang_decl
58 /* Language-dependent contents of an identifier. This must include a
61 struct GTY(()) lang_identifier
63 struct tree_identifier common;
66 /* The resulting tree type. */
68 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
69 chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL")))
72 union tree_node GTY((tag ("0"),
73 desc ("tree_node_structure (&%h)"))) generic;
74 struct lang_identifier GTY((tag ("1"))) identifier;
77 /* We don't use language_function. */
79 struct GTY(()) language_function
84 /* Option information we need to pass to go_create_gogo. */
86 static const char *go_pkgpath = NULL;
87 static const char *go_prefix = NULL;
88 static const char *go_relative_import_path = NULL;
93 go_langhook_init (void)
95 build_common_tree_nodes (false, false);
97 /* I don't know why this has to be done explicitly. */
98 void_list_node = build_tree_list (NULL_TREE, void_type_node);
100 /* We must create the gogo IR after calling build_common_tree_nodes
101 (because Gogo::define_builtin_function_trees refers indirectly
102 to, e.g., unsigned_char_type_node) but before calling
103 build_common_builtin_nodes (because it calls, indirectly,
104 go_type_for_size). */
105 go_create_gogo (INT_TYPE_SIZE, POINTER_SIZE, go_pkgpath, go_prefix,
106 go_relative_import_path);
108 build_common_builtin_nodes ();
110 /* The default precision for floating point numbers. This is used
111 for floating point constants with abstract type. This may
112 eventually be controllable by a command line option. */
113 mpfr_set_default_prec (256);
115 /* Go uses exceptions. */
116 using_eh_for_cleanups ();
121 /* The option mask. */
124 go_langhook_option_lang_mask (void)
129 /* Initialize the options structure. */
132 go_langhook_init_options_struct (struct gcc_options *opts)
134 /* Go says that signed overflow is precisely defined. */
135 opts->x_flag_wrapv = 1;
137 /* We default to using strict aliasing, since Go pointers are safe.
138 This is turned off for code that imports the "unsafe" package,
139 because using unsafe.pointer violates C style aliasing
141 opts->x_flag_strict_aliasing = 1;
143 /* Default to avoiding range issues for complex multiply and
145 opts->x_flag_complex_method = 2;
147 /* The builtin math functions should not set errno. */
148 opts->x_flag_errno_math = 0;
149 opts->frontend_set_flag_errno_math = true;
151 /* We turn on stack splitting if we can. */
152 if (targetm_common.supports_split_stack (false, opts))
153 opts->x_flag_split_stack = 1;
155 /* Exceptions are used to handle recovering from panics. */
156 opts->x_flag_exceptions = 1;
157 opts->x_flag_non_call_exceptions = 1;
160 /* Infrastructure for a VEC of char * pointers. */
162 typedef const char *go_char_p;
163 DEF_VEC_P(go_char_p);
164 DEF_VEC_ALLOC_P(go_char_p, heap);
166 /* The list of directories to search after all the Go specific
167 directories have been searched. */
169 static VEC(go_char_p, heap) *go_search_dirs;
171 /* Handle Go specific options. Return 0 if we didn't do anything. */
174 go_langhook_handle_option (
177 int value ATTRIBUTE_UNUSED,
178 int kind ATTRIBUTE_UNUSED,
179 location_t loc ATTRIBUTE_UNUSED,
180 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
182 enum opt_code code = (enum opt_code) scode;
188 go_add_search_path (arg);
192 /* A -L option is assumed to come from the compiler driver.
193 This is a system directory. We search the following
194 directories, if they exist, before this one:
196 dir/go/VERSION/MACHINE
197 This is like include/c++. */
199 static const char dir_separator_str[] = { DIR_SEPARATOR, 0 };
205 p = XALLOCAVEC (char,
206 (len + sizeof "go" + sizeof DEFAULT_TARGET_VERSION
207 + sizeof DEFAULT_TARGET_MACHINE + 3));
209 if (len > 0 && !IS_DIR_SEPARATOR (p[len - 1]))
210 strcat (p, dir_separator_str);
212 strcat (p, dir_separator_str);
213 strcat (p, DEFAULT_TARGET_VERSION);
214 if (stat (p, &st) == 0 && S_ISDIR (st.st_mode))
216 go_add_search_path (p);
217 strcat (p, dir_separator_str);
218 strcat (p, DEFAULT_TARGET_MACHINE);
219 if (stat (p, &st) == 0 && S_ISDIR (st.st_mode))
220 go_add_search_path (p);
223 /* Search ARG too, but only after we've searched to Go
224 specific directories for all -L arguments. */
225 VEC_safe_push (go_char_p, heap, go_search_dirs, arg);
230 ret = go_enable_dump (arg) ? true : false;
233 case OPT_fgo_optimize_:
234 ret = go_enable_optimize (arg) ? true : false;
237 case OPT_fgo_pkgpath_:
241 case OPT_fgo_prefix_:
245 case OPT_fgo_relative_import_path_:
246 go_relative_import_path = arg;
250 /* Just return 1 to indicate that the option is valid. */
257 /* Run after parsing options. */
260 go_langhook_post_options (const char **pfilename ATTRIBUTE_UNUSED)
265 gcc_assert (num_in_fnames > 0);
267 FOR_EACH_VEC_ELT (go_char_p, go_search_dirs, ix, dir)
268 go_add_search_path (dir);
269 VEC_free (go_char_p, heap, go_search_dirs);
270 go_search_dirs = NULL;
272 if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
273 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
275 /* Returning false means that the backend should be used. */
280 go_langhook_parse_file (void)
282 go_parse_input_files (in_fnames, num_in_fnames, flag_syntax_only,
283 go_require_return_statement);
287 go_langhook_type_for_size (unsigned int bits, int unsignedp)
289 return go_type_for_size (bits, unsignedp);
293 go_langhook_type_for_mode (enum machine_mode mode, int unsignedp)
296 /* Go has no vector types. Build them here. FIXME: It does not
297 make sense for the middle-end to ask the frontend for a type
298 which the frontend does not support. However, at least for now
299 it is required. See PR 46805. */
300 if (VECTOR_MODE_P (mode))
304 inner = go_langhook_type_for_mode (GET_MODE_INNER (mode), unsignedp);
305 if (inner != NULL_TREE)
306 return build_vector_type_for_mode (inner, mode);
310 type = go_type_for_mode (mode, unsignedp);
314 #if HOST_BITS_PER_WIDE_INT >= 64
315 /* The middle-end and some backends rely on TImode being supported
319 type = build_nonstandard_integer_type (GET_MODE_BITSIZE (TImode),
321 if (type && TYPE_MODE (type) == TImode)
328 /* Record a builtin function. We just ignore builtin functions. */
331 go_langhook_builtin_function (tree decl)
336 /* Return true if we are in the global binding level. */
339 go_langhook_global_bindings_p (void)
341 return current_function_decl == NULL_TREE;
344 /* Push a declaration into the current binding level. We can't
345 usefully implement this since we don't want to convert from tree
346 back to one of our internal data structures. I think the only way
347 this is used is to record a decl which is to be returned by
348 getdecls, and we could implement it for that purpose if
352 go_langhook_pushdecl (tree decl ATTRIBUTE_UNUSED)
357 /* This hook is used to get the current list of declarations as trees.
358 We don't support that; instead we use the write_globals hook. This
359 can't simply crash because it is called by -gstabs. */
362 go_langhook_getdecls (void)
367 /* Write out globals. */
370 go_langhook_write_globals (void)
375 /* Go specific gimplification. We need to gimplify
376 CALL_EXPR_STATIC_CHAIN, because the gimplifier doesn't handle
380 go_langhook_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
382 if (TREE_CODE (*expr_p) == CALL_EXPR
383 && CALL_EXPR_STATIC_CHAIN (*expr_p) != NULL_TREE)
384 gimplify_expr (&CALL_EXPR_STATIC_CHAIN (*expr_p), pre_p, post_p,
385 is_gimple_val, fb_rvalue);
389 /* Return a decl for the exception personality function. The function
390 itself is implemented in libgo/runtime/go-unwind.c. */
393 go_langhook_eh_personality (void)
395 static tree personality_decl;
396 if (personality_decl == NULL_TREE)
398 personality_decl = build_personality_function ("gccgo");
399 go_preserve_from_gc (personality_decl);
401 return personality_decl;
404 /* Functions called directly by the generic backend. */
407 convert (tree type, tree expr)
409 if (type == error_mark_node
410 || expr == error_mark_node
411 || TREE_TYPE (expr) == error_mark_node)
412 return error_mark_node;
414 if (type == TREE_TYPE (expr))
417 if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
418 return fold_convert (type, expr);
420 switch (TREE_CODE (type))
424 return fold_convert (type, expr);
426 return fold (convert_to_integer (type, expr));
428 return fold (convert_to_pointer (type, expr));
430 return fold (convert_to_real (type, expr));
432 return fold (convert_to_complex (type, expr));
440 /* FIXME: This is a hack to preserve trees that we create from the
441 garbage collector. */
443 static GTY(()) tree go_gc_root;
446 go_preserve_from_gc (tree t)
448 go_gc_root = tree_cons (NULL_TREE, t, go_gc_root);
451 /* Convert an identifier for use in an error message. */
454 go_localize_identifier (const char *ident)
456 return identifier_to_locale (ident);
459 #undef LANG_HOOKS_NAME
460 #undef LANG_HOOKS_INIT
461 #undef LANG_HOOKS_OPTION_LANG_MASK
462 #undef LANG_HOOKS_INIT_OPTIONS_STRUCT
463 #undef LANG_HOOKS_HANDLE_OPTION
464 #undef LANG_HOOKS_POST_OPTIONS
465 #undef LANG_HOOKS_PARSE_FILE
466 #undef LANG_HOOKS_TYPE_FOR_MODE
467 #undef LANG_HOOKS_TYPE_FOR_SIZE
468 #undef LANG_HOOKS_BUILTIN_FUNCTION
469 #undef LANG_HOOKS_GLOBAL_BINDINGS_P
470 #undef LANG_HOOKS_PUSHDECL
471 #undef LANG_HOOKS_GETDECLS
472 #undef LANG_HOOKS_WRITE_GLOBALS
473 #undef LANG_HOOKS_GIMPLIFY_EXPR
474 #undef LANG_HOOKS_EH_PERSONALITY
476 #define LANG_HOOKS_NAME "GNU Go"
477 #define LANG_HOOKS_INIT go_langhook_init
478 #define LANG_HOOKS_OPTION_LANG_MASK go_langhook_option_lang_mask
479 #define LANG_HOOKS_INIT_OPTIONS_STRUCT go_langhook_init_options_struct
480 #define LANG_HOOKS_HANDLE_OPTION go_langhook_handle_option
481 #define LANG_HOOKS_POST_OPTIONS go_langhook_post_options
482 #define LANG_HOOKS_PARSE_FILE go_langhook_parse_file
483 #define LANG_HOOKS_TYPE_FOR_MODE go_langhook_type_for_mode
484 #define LANG_HOOKS_TYPE_FOR_SIZE go_langhook_type_for_size
485 #define LANG_HOOKS_BUILTIN_FUNCTION go_langhook_builtin_function
486 #define LANG_HOOKS_GLOBAL_BINDINGS_P go_langhook_global_bindings_p
487 #define LANG_HOOKS_PUSHDECL go_langhook_pushdecl
488 #define LANG_HOOKS_GETDECLS go_langhook_getdecls
489 #define LANG_HOOKS_WRITE_GLOBALS go_langhook_write_globals
490 #define LANG_HOOKS_GIMPLIFY_EXPR go_langhook_gimplify_expr
491 #define LANG_HOOKS_EH_PERSONALITY go_langhook_eh_personality
493 struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
495 #include "gt-go-go-lang.h"
496 #include "gtype-go.h"