1 /* go-lang.c -- Go frontend gcc interface.
2 Copyright (C) 2009-2017 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/>. */
22 #include "coretypes.h"
25 #include "gimple-expr.h"
26 #include "diagnostic.h"
28 #include "fold-const.h"
30 #include "stor-layout.h"
33 #include "langhooks.h"
34 #include "langhooks-def.h"
35 #include "common/common-target.h"
46 /* Language-dependent contents of a type. */
48 struct GTY(()) lang_type
53 /* Language-dependent contents of a decl. */
55 struct GTY(()) lang_decl
60 /* Language-dependent contents of an identifier. This must include a
63 struct GTY(()) lang_identifier
65 struct tree_identifier common
;
68 /* The resulting tree type. */
70 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
71 chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL")))
74 union tree_node
GTY((tag ("0"),
75 desc ("tree_node_structure (&%h)"))) generic
;
76 struct lang_identifier
GTY((tag ("1"))) identifier
;
79 /* We don't use language_function. */
81 struct GTY(()) language_function
86 /* Option information we need to pass to go_create_gogo. */
88 static const char *go_pkgpath
= NULL
;
89 static const char *go_prefix
= NULL
;
90 static const char *go_relative_import_path
= NULL
;
91 static const char *go_c_header
= NULL
;
96 go_langhook_init (void)
98 build_common_tree_nodes (false);
100 /* I don't know why this has to be done explicitly. */
101 void_list_node
= build_tree_list (NULL_TREE
, void_type_node
);
103 /* We must create the gogo IR after calling build_common_tree_nodes
104 (because Gogo::define_builtin_function_trees refers indirectly
105 to, e.g., unsigned_char_type_node) but before calling
106 build_common_builtin_nodes (because it calls, indirectly,
107 go_type_for_size). */
108 struct go_create_gogo_args args
;
109 args
.int_type_size
= INT_TYPE_SIZE
;
110 args
.pointer_size
= POINTER_SIZE
;
111 args
.pkgpath
= go_pkgpath
;
112 args
.prefix
= go_prefix
;
113 args
.relative_import_path
= go_relative_import_path
;
114 args
.c_header
= go_c_header
;
115 args
.check_divide_by_zero
= go_check_divide_zero
;
116 args
.check_divide_overflow
= go_check_divide_overflow
;
117 args
.compiling_runtime
= go_compiling_runtime
;
118 args
.debug_escape_level
= go_debug_escape_level
;
119 args
.nil_check_size_threshold
= TARGET_AIX
? -1 : 4096;
120 args
.linemap
= go_get_linemap();
121 args
.backend
= go_get_backend();
122 go_create_gogo (&args
);
124 build_common_builtin_nodes ();
126 /* The default precision for floating point numbers. This is used
127 for floating point constants with abstract type. This may
128 eventually be controllable by a command line option. */
129 mpfr_set_default_prec (256);
131 /* Go uses exceptions. */
132 using_eh_for_cleanups ();
137 /* The option mask. */
140 go_langhook_option_lang_mask (void)
145 /* Initialize the options structure. */
148 go_langhook_init_options_struct (struct gcc_options
*opts
)
150 /* Go says that signed overflow is precisely defined. */
151 opts
->x_flag_wrapv
= 1;
153 /* We default to using strict aliasing, since Go pointers are safe.
154 This is turned off for code that imports the "unsafe" package,
155 because using unsafe.pointer violates C style aliasing
157 opts
->x_flag_strict_aliasing
= 1;
159 /* Default to avoiding range issues for complex multiply and
161 opts
->x_flag_complex_method
= 2;
163 /* The builtin math functions should not set errno. */
164 opts
->x_flag_errno_math
= 0;
165 opts
->frontend_set_flag_errno_math
= true;
167 /* Exceptions are used to handle recovering from panics. */
168 opts
->x_flag_exceptions
= 1;
169 opts
->x_flag_non_call_exceptions
= 1;
171 /* We need to keep pointers live for the garbage collector. */
172 opts
->x_flag_keep_gc_roots_live
= 1;
174 /* Go programs expect runtime.Callers to work, and that uses
175 libbacktrace that uses debug info. Set the debug info level to 1
176 by default. In post_options we will set the debug type if the
177 debug info level was not set back to 0 on the command line. */
178 opts
->x_debug_info_level
= DINFO_LEVEL_TERSE
;
181 /* Infrastructure for a vector of char * pointers. */
183 typedef const char *go_char_p
;
185 /* The list of directories to search after all the Go specific
186 directories have been searched. */
188 static vec
<go_char_p
> go_search_dirs
;
190 /* Handle Go specific options. Return 0 if we didn't do anything. */
193 go_langhook_handle_option (
196 int value ATTRIBUTE_UNUSED
,
197 int kind ATTRIBUTE_UNUSED
,
198 location_t loc ATTRIBUTE_UNUSED
,
199 const struct cl_option_handlers
*handlers ATTRIBUTE_UNUSED
)
201 enum opt_code code
= (enum opt_code
) scode
;
207 go_add_search_path (arg
);
211 /* A -L option is assumed to come from the compiler driver.
212 This is a system directory. We search the following
213 directories, if they exist, before this one:
215 dir/go/VERSION/MACHINE
216 This is like include/c++. */
218 static const char dir_separator_str
[] = { DIR_SEPARATOR
, 0 };
224 p
= XALLOCAVEC (char,
225 (len
+ sizeof "go" + sizeof DEFAULT_TARGET_VERSION
226 + sizeof DEFAULT_TARGET_MACHINE
+ 3));
228 if (len
> 0 && !IS_DIR_SEPARATOR (p
[len
- 1]))
229 strcat (p
, dir_separator_str
);
231 strcat (p
, dir_separator_str
);
232 strcat (p
, DEFAULT_TARGET_VERSION
);
233 if (stat (p
, &st
) == 0 && S_ISDIR (st
.st_mode
))
235 go_add_search_path (p
);
236 strcat (p
, dir_separator_str
);
237 strcat (p
, DEFAULT_TARGET_MACHINE
);
238 if (stat (p
, &st
) == 0 && S_ISDIR (st
.st_mode
))
239 go_add_search_path (p
);
242 /* Search ARG too, but only after we've searched to Go
243 specific directories for all -L arguments. */
244 go_search_dirs
.safe_push (arg
);
249 ret
= go_enable_dump (arg
) ? true : false;
252 case OPT_fgo_optimize_
:
253 ret
= go_enable_optimize (arg
) ? true : false;
256 case OPT_fgo_pkgpath_
:
260 case OPT_fgo_prefix_
:
264 case OPT_fgo_relative_import_path_
:
265 go_relative_import_path
= arg
;
268 case OPT_fgo_c_header_
:
273 /* Just return 1 to indicate that the option is valid. */
280 /* Run after parsing options. */
283 go_langhook_post_options (const char **pfilename ATTRIBUTE_UNUSED
)
288 gcc_assert (num_in_fnames
> 0);
290 FOR_EACH_VEC_ELT (go_search_dirs
, ix
, dir
)
291 go_add_search_path (dir
);
292 go_search_dirs
.release ();
294 if (flag_excess_precision_cmdline
== EXCESS_PRECISION_DEFAULT
)
295 flag_excess_precision_cmdline
= EXCESS_PRECISION_STANDARD
;
297 /* Tail call optimizations can confuse uses of runtime.Callers. */
298 if (!global_options_set
.x_flag_optimize_sibling_calls
)
299 global_options
.x_flag_optimize_sibling_calls
= 0;
301 /* If the debug info level is still 1, as set in init_options, make
302 sure that some debugging type is selected. */
303 if (global_options
.x_debug_info_level
== DINFO_LEVEL_TERSE
304 && global_options
.x_write_symbols
== NO_DEBUG
)
305 global_options
.x_write_symbols
= PREFERRED_DEBUGGING_TYPE
;
307 /* We turn on stack splitting if we can. */
308 if (!global_options_set
.x_flag_split_stack
309 && targetm_common
.supports_split_stack (false, &global_options
))
310 global_options
.x_flag_split_stack
= 1;
312 /* If stack splitting is turned on, and the user did not explicitly
313 request function partitioning, turn off partitioning, as it
314 confuses the linker when trying to handle partitioned split-stack
315 code that calls a non-split-stack function. */
316 if (global_options
.x_flag_split_stack
317 && global_options
.x_flag_reorder_blocks_and_partition
318 && !global_options_set
.x_flag_reorder_blocks_and_partition
)
319 global_options
.x_flag_reorder_blocks_and_partition
= 0;
321 /* Returning false means that the backend should be used. */
326 go_langhook_parse_file (void)
328 go_parse_input_files (in_fnames
, num_in_fnames
, flag_syntax_only
,
329 go_require_return_statement
);
331 /* Final processing of globals and early debug info generation. */
336 go_langhook_type_for_size (unsigned int bits
, int unsignedp
)
341 if (bits
== INT_TYPE_SIZE
)
342 type
= unsigned_type_node
;
343 else if (bits
== CHAR_TYPE_SIZE
)
344 type
= unsigned_char_type_node
;
345 else if (bits
== SHORT_TYPE_SIZE
)
346 type
= short_unsigned_type_node
;
347 else if (bits
== LONG_TYPE_SIZE
)
348 type
= long_unsigned_type_node
;
349 else if (bits
== LONG_LONG_TYPE_SIZE
)
350 type
= long_long_unsigned_type_node
;
352 type
= make_unsigned_type(bits
);
356 if (bits
== INT_TYPE_SIZE
)
357 type
= integer_type_node
;
358 else if (bits
== CHAR_TYPE_SIZE
)
359 type
= signed_char_type_node
;
360 else if (bits
== SHORT_TYPE_SIZE
)
361 type
= short_integer_type_node
;
362 else if (bits
== LONG_TYPE_SIZE
)
363 type
= long_integer_type_node
;
364 else if (bits
== LONG_LONG_TYPE_SIZE
)
365 type
= long_long_integer_type_node
;
367 type
= make_signed_type(bits
);
373 go_langhook_type_for_mode (machine_mode mode
, int unsignedp
)
376 /* Go has no vector types. Build them here. FIXME: It does not
377 make sense for the middle-end to ask the frontend for a type
378 which the frontend does not support. However, at least for now
379 it is required. See PR 46805. */
380 if (VECTOR_MODE_P (mode
))
384 inner
= go_langhook_type_for_mode (GET_MODE_INNER (mode
), unsignedp
);
385 if (inner
!= NULL_TREE
)
386 return build_vector_type_for_mode (inner
, mode
);
390 scalar_int_mode imode
;
391 scalar_float_mode fmode
;
393 if (is_int_mode (mode
, &imode
))
394 return go_langhook_type_for_size (GET_MODE_BITSIZE (imode
), unsignedp
);
395 else if (is_float_mode (mode
, &fmode
))
397 switch (GET_MODE_BITSIZE (fmode
))
400 return float_type_node
;
402 return double_type_node
;
404 // We have to check for long double in order to support
405 // i386 excess precision.
406 if (fmode
== TYPE_MODE(long_double_type_node
))
407 return long_double_type_node
;
410 else if (is_complex_float_mode (mode
, &cmode
))
412 switch (GET_MODE_BITSIZE (cmode
))
415 return complex_float_type_node
;
417 return complex_double_type_node
;
419 // We have to check for long double in order to support
420 // i386 excess precision.
421 if (cmode
== TYPE_MODE(complex_long_double_type_node
))
422 return complex_long_double_type_node
;
426 #if HOST_BITS_PER_WIDE_INT >= 64
427 /* The middle-end and some backends rely on TImode being supported
431 type
= build_nonstandard_integer_type (GET_MODE_BITSIZE (TImode
),
433 if (type
&& TYPE_MODE (type
) == TImode
)
440 /* Record a builtin function. We just ignore builtin functions. */
443 go_langhook_builtin_function (tree decl
)
448 /* Return true if we are in the global binding level. */
451 go_langhook_global_bindings_p (void)
453 return current_function_decl
== NULL_TREE
;
456 /* Push a declaration into the current binding level. We can't
457 usefully implement this since we don't want to convert from tree
458 back to one of our internal data structures. I think the only way
459 this is used is to record a decl which is to be returned by
460 getdecls, and we could implement it for that purpose if
464 go_langhook_pushdecl (tree decl ATTRIBUTE_UNUSED
)
469 /* This hook is used to get the current list of declarations as trees.
470 We don't support that; instead we use the write_globals hook. This
471 can't simply crash because it is called by -gstabs. */
474 go_langhook_getdecls (void)
479 /* Go specific gimplification. We need to gimplify
480 CALL_EXPR_STATIC_CHAIN, because the gimplifier doesn't handle
484 go_langhook_gimplify_expr (tree
*expr_p
, gimple_seq
*pre_p
, gimple_seq
*post_p
)
486 if (TREE_CODE (*expr_p
) == CALL_EXPR
487 && CALL_EXPR_STATIC_CHAIN (*expr_p
) != NULL_TREE
)
488 gimplify_expr (&CALL_EXPR_STATIC_CHAIN (*expr_p
), pre_p
, post_p
,
489 is_gimple_val
, fb_rvalue
);
493 /* Return a decl for the exception personality function. The function
494 itself is implemented in libgo/runtime/go-unwind.c. */
497 go_langhook_eh_personality (void)
499 static tree personality_decl
;
500 if (personality_decl
== NULL_TREE
)
502 personality_decl
= build_personality_function ("gccgo");
503 go_preserve_from_gc (personality_decl
);
505 return personality_decl
;
508 /* Functions called directly by the generic backend. */
511 convert (tree type
, tree expr
)
513 if (type
== error_mark_node
514 || expr
== error_mark_node
515 || TREE_TYPE (expr
) == error_mark_node
)
516 return error_mark_node
;
518 if (type
== TREE_TYPE (expr
))
521 if (TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (TREE_TYPE (expr
)))
522 return fold_convert (type
, expr
);
524 switch (TREE_CODE (type
))
528 return fold_convert (type
, expr
);
530 return fold (convert_to_integer (type
, expr
));
532 return fold (convert_to_pointer (type
, expr
));
534 return fold (convert_to_real (type
, expr
));
536 return fold (convert_to_complex (type
, expr
));
544 /* FIXME: This is a hack to preserve trees that we create from the
545 garbage collector. */
547 static GTY(()) tree go_gc_root
;
550 go_preserve_from_gc (tree t
)
552 go_gc_root
= tree_cons (NULL_TREE
, t
, go_gc_root
);
555 /* Convert an identifier for use in an error message. */
558 go_localize_identifier (const char *ident
)
560 return identifier_to_locale (ident
);
563 #undef LANG_HOOKS_NAME
564 #undef LANG_HOOKS_INIT
565 #undef LANG_HOOKS_OPTION_LANG_MASK
566 #undef LANG_HOOKS_INIT_OPTIONS_STRUCT
567 #undef LANG_HOOKS_HANDLE_OPTION
568 #undef LANG_HOOKS_POST_OPTIONS
569 #undef LANG_HOOKS_PARSE_FILE
570 #undef LANG_HOOKS_TYPE_FOR_MODE
571 #undef LANG_HOOKS_TYPE_FOR_SIZE
572 #undef LANG_HOOKS_BUILTIN_FUNCTION
573 #undef LANG_HOOKS_GLOBAL_BINDINGS_P
574 #undef LANG_HOOKS_PUSHDECL
575 #undef LANG_HOOKS_GETDECLS
576 #undef LANG_HOOKS_GIMPLIFY_EXPR
577 #undef LANG_HOOKS_EH_PERSONALITY
579 #define LANG_HOOKS_NAME "GNU Go"
580 #define LANG_HOOKS_INIT go_langhook_init
581 #define LANG_HOOKS_OPTION_LANG_MASK go_langhook_option_lang_mask
582 #define LANG_HOOKS_INIT_OPTIONS_STRUCT go_langhook_init_options_struct
583 #define LANG_HOOKS_HANDLE_OPTION go_langhook_handle_option
584 #define LANG_HOOKS_POST_OPTIONS go_langhook_post_options
585 #define LANG_HOOKS_PARSE_FILE go_langhook_parse_file
586 #define LANG_HOOKS_TYPE_FOR_MODE go_langhook_type_for_mode
587 #define LANG_HOOKS_TYPE_FOR_SIZE go_langhook_type_for_size
588 #define LANG_HOOKS_BUILTIN_FUNCTION go_langhook_builtin_function
589 #define LANG_HOOKS_GLOBAL_BINDINGS_P go_langhook_global_bindings_p
590 #define LANG_HOOKS_PUSHDECL go_langhook_pushdecl
591 #define LANG_HOOKS_GETDECLS go_langhook_getdecls
592 #define LANG_HOOKS_GIMPLIFY_EXPR go_langhook_gimplify_expr
593 #define LANG_HOOKS_EH_PERSONALITY go_langhook_eh_personality
595 struct lang_hooks lang_hooks
= LANG_HOOKS_INITIALIZER
;
597 #include "gt-go-go-lang.h"
598 #include "gtype-go.h"