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b0278d39 | 1 | /* The lang_hooks data structure. |
a8349c62 | 2 | Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
e8602e56 | 3 | |
4642865b | 4 | This file is part of GCC. |
e8602e56 | 5 | |
4642865b | 6 | GCC is free software; you can redistribute it and/or modify |
e8602e56 | 7 | it under the terms of the GNU General Public License as published by |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
4642865b | 11 | GCC is distributed in the hope that it will be useful, |
e8602e56 | 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
4642865b | 17 | along with GCC; see the file COPYING. If not, write to |
e8602e56 | 18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #ifndef GCC_LANG_HOOKS_H | |
22 | #define GCC_LANG_HOOKS_H | |
23 | ||
b467ecc1 | 24 | /* This file should be #include-d after tree.h. */ |
25 | ||
6c7ff025 | 26 | struct diagnostic_context; |
27 | ||
b7fced5e | 28 | /* A print hook for print_tree (). */ |
3ad4992f | 29 | typedef void (*lang_print_tree_hook) (FILE *, tree, int indent); |
b7fced5e | 30 | |
b0278d39 | 31 | /* The following hooks are documented in langhooks.c. Must not be |
32 | NULL. */ | |
33 | ||
34 | struct lang_hooks_for_tree_inlining | |
35 | { | |
00ea394c | 36 | tree (*walk_subtrees) (tree *, int *, |
37 | tree (*) (tree *, int *, void *), | |
38 | void *, void *); | |
39 | int (*cannot_inline_tree_fn) (tree *); | |
40 | int (*disregard_inline_limits) (tree); | |
41 | tree (*add_pending_fn_decls) (void *, tree); | |
00ea394c | 42 | int (*auto_var_in_fn_p) (tree, tree); |
00ea394c | 43 | int (*anon_aggr_type_p) (tree); |
1f8a6ff8 | 44 | bool (*var_mod_type_p) (tree, tree); |
00ea394c | 45 | int (*start_inlining) (tree); |
46 | void (*end_inlining) (tree); | |
f0c467da | 47 | tree (*convert_parm_for_inlining) (tree, tree, tree, int); |
b0278d39 | 48 | }; |
49 | ||
833eb724 | 50 | struct lang_hooks_for_callgraph |
51 | { | |
ec1e35b2 | 52 | /* The node passed is a language-specific tree node. If its contents |
53 | are relevant to use of other declarations, mark them. */ | |
54 | tree (*analyze_expr) (tree *, int *, tree); | |
55 | ||
833eb724 | 56 | /* Produce RTL for function passed as argument. */ |
00ea394c | 57 | void (*expand_function) (tree); |
833eb724 | 58 | }; |
59 | ||
c80c4f22 | 60 | /* Lang hooks for management of language-specific data or status |
61 | when entering / leaving functions etc. */ | |
62 | struct lang_hooks_for_functions | |
63 | { | |
64 | /* Called when entering a function. */ | |
3ad4992f | 65 | void (*init) (struct function *); |
c80c4f22 | 66 | |
67 | /* Called when leaving a function. */ | |
3ad4992f | 68 | void (*final) (struct function *); |
c80c4f22 | 69 | |
70 | /* Called when entering a nested function. */ | |
3ad4992f | 71 | void (*enter_nested) (struct function *); |
c80c4f22 | 72 | |
73 | /* Called when leaving a nested function. */ | |
3ad4992f | 74 | void (*leave_nested) (struct function *); |
90e3d9ba | 75 | |
4ee9c684 | 76 | /* Determines if it's ok for a function to have no noreturn attribute. */ |
77 | bool (*missing_noreturn_ok_p) (tree); | |
90e3d9ba | 78 | }; |
79 | ||
3119c950 | 80 | /* The following hooks are used by tree-dump.c. */ |
81 | ||
82 | struct lang_hooks_for_tree_dump | |
83 | { | |
6ef828f9 | 84 | /* Dump language-specific parts of tree nodes. Returns nonzero if it |
3119c950 | 85 | does not want the usual dumping of the second argument. */ |
3ad4992f | 86 | bool (*dump_tree) (void *, tree); |
3119c950 | 87 | |
88 | /* Determine type qualifiers in a language-specific way. */ | |
3ad4992f | 89 | int (*type_quals) (tree); |
3119c950 | 90 | }; |
91 | ||
a1f71e15 | 92 | /* Hooks related to types. */ |
93 | ||
94 | struct lang_hooks_for_types | |
95 | { | |
771d21fa | 96 | /* Return a new type (with the indicated CODE), doing whatever |
97 | language-specific processing is required. */ | |
3ad4992f | 98 | tree (*make_type) (enum tree_code); |
8851e806 | 99 | |
771d21fa | 100 | /* Given MODE and UNSIGNEDP, return a suitable type-tree with that |
101 | mode. */ | |
3ad4992f | 102 | tree (*type_for_mode) (enum machine_mode, int); |
771d21fa | 103 | |
104 | /* Given PRECISION and UNSIGNEDP, return a suitable type-tree for an | |
105 | integer type with at least that precision. */ | |
3ad4992f | 106 | tree (*type_for_size) (unsigned, int); |
4070745f | 107 | |
108 | /* Given an integer type T, return a type like T but unsigned. | |
109 | If T is unsigned, the value is T. */ | |
3ad4992f | 110 | tree (*unsigned_type) (tree); |
4070745f | 111 | |
112 | /* Given an integer type T, return a type like T but signed. | |
113 | If T is signed, the value is T. */ | |
3ad4992f | 114 | tree (*signed_type) (tree); |
4070745f | 115 | |
116 | /* Return a type the same as TYPE except unsigned or signed | |
117 | according to UNSIGNEDP. */ | |
3ad4992f | 118 | tree (*signed_or_unsigned_type) (int, tree); |
1dd25100 | 119 | |
63c62881 | 120 | /* Given a type, apply default promotions to unnamed function |
121 | arguments and return the new type. Return the same type if no | |
122 | change. Required by any language that supports variadic | |
123 | arguments. The default hook aborts. */ | |
3ad4992f | 124 | tree (*type_promotes_to) (tree); |
63c62881 | 125 | |
b268e47e | 126 | /* Register TYPE as a builtin type with the indicated NAME. The |
127 | TYPE is placed in the outermost lexical scope. The semantics | |
128 | should be analogous to: | |
129 | ||
130 | typedef TYPE NAME; | |
131 | ||
132 | in C. The default hook ignores the declaration. */ | |
133 | void (*register_builtin_type) (tree, const char *); | |
134 | ||
1dd25100 | 135 | /* This routine is called in tree.c to print an error message for |
136 | invalid use of an incomplete type. VALUE is the expression that | |
137 | was used (or 0 if that isn't known) and TYPE is the type that was | |
138 | invalid. */ | |
3ad4992f | 139 | void (*incomplete_type_error) (tree value, tree type); |
a26d3281 | 140 | |
b225134e | 141 | /* Called from assign_temp to return the maximum size, if there is one, |
142 | for a type. */ | |
143 | tree (*max_size) (tree); | |
144 | ||
a26d3281 | 145 | /* Nonzero if types that are identical are to be hashed so that only |
146 | one copy is kept. If a language requires unique types for each | |
147 | user-specified type, such as Ada, this should be set to TRUE. */ | |
148 | bool hash_types; | |
a1f71e15 | 149 | }; |
150 | ||
20325f61 | 151 | /* Language hooks related to decls and the symbol table. */ |
152 | ||
153 | struct lang_hooks_for_decls | |
154 | { | |
6ef828f9 | 155 | /* Returns nonzero if we are in the global binding level. Ada |
20325f61 | 156 | returns -1 for an undocumented reason used in stor-layout.c. */ |
3ad4992f | 157 | int (*global_bindings_p) (void); |
20325f61 | 158 | |
159 | /* Insert BLOCK at the end of the list of subblocks of the | |
160 | current binding level. This is used when a BIND_EXPR is expanded, | |
161 | to handle the BLOCK node inside the BIND_EXPR. */ | |
3ad4992f | 162 | void (*insert_block) (tree); |
20325f61 | 163 | |
20325f61 | 164 | /* Function to add a decl to the current scope level. Takes one |
165 | argument, a decl to add. Returns that decl, or, if the same | |
166 | symbol is already declared, may return a different decl for that | |
167 | name. */ | |
3ad4992f | 168 | tree (*pushdecl) (tree); |
20325f61 | 169 | |
170 | /* Returns the chain of decls so far in the current scope level. */ | |
3ad4992f | 171 | tree (*getdecls) (void); |
8d58a5a7 | 172 | |
173 | /* Returns true when we should warn for an unused global DECL. | |
174 | We will already have checked that it has static binding. */ | |
3ad4992f | 175 | bool (*warn_unused_global) (tree); |
28db4d96 | 176 | |
177 | /* Obtain a list of globals and do final output on them at end | |
178 | of compilation */ | |
3ad4992f | 179 | void (*final_write_globals) (void); |
e2e9c55b | 180 | |
8efca15a | 181 | /* Do necessary preparations before assemble_variable can proceed. */ |
3ad4992f | 182 | void (*prepare_assemble_variable) (tree); |
8efca15a | 183 | |
e2e9c55b | 184 | /* True if this decl may be called via a sibcall. */ |
3ad4992f | 185 | bool (*ok_for_sibcall) (tree); |
537cd941 | 186 | |
187 | /* Return the COMDAT group into which this DECL should be placed. | |
188 | It is known that the DECL belongs in *some* COMDAT group when | |
189 | this hook is called. The return value will be used immediately, | |
190 | but not explicitly deallocated, so implementations should not use | |
191 | xmalloc to allocate the string returned. (Typically, the return | |
192 | value will be the string already stored in an | |
193 | IDENTIFIER_NODE.) */ | |
194 | const char * (*comdat_group) (tree); | |
20325f61 | 195 | }; |
196 | ||
b0278d39 | 197 | /* Language-specific hooks. See langhooks-def.h for defaults. */ |
198 | ||
199 | struct lang_hooks | |
200 | { | |
d19bd1f0 | 201 | /* String identifying the front end. e.g. "GNU C++". */ |
202 | const char *name; | |
203 | ||
204 | /* sizeof (struct lang_identifier), so make_node () creates | |
205 | identifier nodes long enough for the language-specific slots. */ | |
206 | size_t identifier_size; | |
207 | ||
295e387a | 208 | /* Determines the size of any language-specific 'x' or 'c' nodes. |
209 | Since it is called from make_node, the only information available | |
210 | is the tree code. Expected to abort on unrecognized codes. */ | |
3ad4992f | 211 | size_t (*tree_size) (enum tree_code); |
295e387a | 212 | |
435fb09b | 213 | /* The first callback made to the front end, for simple |
5457b645 | 214 | initialization needed before any calls to handle_option. Return |
215 | the language mask to filter the switch array with. */ | |
4838a8b6 | 216 | unsigned int (*init_options) (unsigned int argc, const char **argv); |
b0278d39 | 217 | |
f63da8d3 | 218 | /* Callback used to perform language-specific initialization for the |
219 | global diagnostic context structure. */ | |
220 | void (*initialize_diagnostics) (struct diagnostic_context *); | |
221 | ||
5457b645 | 222 | /* Handle the switch CODE, which has real type enum opt_code from |
223 | options.h. If the switch takes an argument, it is passed in ARG | |
917bbcab | 224 | which points to permanent storage. The handler is responsible for |
5457b645 | 225 | checking whether ARG is NULL, which indicates that no argument |
226 | was in fact supplied. For -f and -W switches, VALUE is 1 or 0 | |
227 | for the positive and negative forms respectively. | |
228 | ||
229 | Return 1 if the switch is valid, 0 if invalid, and -1 if it's | |
230 | valid and should not be treated as language-independent too. */ | |
231 | int (*handle_option) (size_t code, const char *arg, int value); | |
232 | ||
76bf7746 | 233 | /* Return false to use the default complaint about a missing |
234 | argument, otherwise output a complaint and return true. */ | |
235 | bool (*missing_argument) (const char *opt, size_t code); | |
236 | ||
03bde601 | 237 | /* Called when all command line options have been parsed to allow |
238 | further processing and initialization | |
dd436eaf | 239 | |
03bde601 | 240 | Should return true to indicate that a compiler back-end is |
241 | not required, such as with the -E option. | |
3ad4992f | 242 | |
6ef828f9 | 243 | If errorcount is nonzero after this call the compiler exits |
dd436eaf | 244 | immediately and the finish hook is not called. */ |
3ad4992f | 245 | bool (*post_options) (const char **); |
03bde601 | 246 | |
247 | /* Called after post_options to initialize the front end. Return | |
248 | false to indicate that no further compilation be performed, in | |
249 | which case the finish hook is called immediately. */ | |
3ad4992f | 250 | bool (*init) (void); |
435fb09b | 251 | |
252 | /* Called at the end of compilation, as a finalizer. */ | |
3ad4992f | 253 | void (*finish) (void); |
435fb09b | 254 | |
6ef828f9 | 255 | /* Parses the entire file. The argument is nonzero to cause bison |
1c542e4c | 256 | parsers to dump debugging information during parsing. */ |
3ad4992f | 257 | void (*parse_file) (int); |
b78207a0 | 258 | |
435fb09b | 259 | /* Called immediately after parsing to clear the binding stack. */ |
3ad4992f | 260 | void (*clear_binding_stack) (void); |
435fb09b | 261 | |
b0278d39 | 262 | /* Called to obtain the alias set to be used for an expression or type. |
263 | Returns -1 if the language does nothing special for it. */ | |
3ad4992f | 264 | HOST_WIDE_INT (*get_alias_set) (tree); |
b0278d39 | 265 | |
b3187c7c | 266 | /* Called with an expression that is to be processed as a constant. |
267 | Returns either the same expression or a language-independent | |
268 | constant equivalent to its input. */ | |
3ad4992f | 269 | tree (*expand_constant) (tree); |
b3187c7c | 270 | |
b467ecc1 | 271 | /* Called by expand_expr for language-specific tree codes. |
272 | Fourth argument is actually an enum expand_modifier. */ | |
60ffaf4d | 273 | rtx (*expand_expr) (tree, rtx, enum machine_mode, int, rtx *); |
b467ecc1 | 274 | |
4ee9c684 | 275 | /* Called by expand_expr to generate the definition of a decl. Returns |
276 | 1 if handled, 0 otherwise. */ | |
277 | int (*expand_decl) (tree); | |
278 | ||
aff9e656 | 279 | /* Prepare expr to be an argument of a TRUTH_NOT_EXPR or other logical |
280 | operation. | |
281 | ||
282 | This preparation consists of taking the ordinary representation | |
283 | of an expression expr and producing a valid tree boolean | |
284 | expression describing whether expr is nonzero. We could simply | |
285 | always do build_binary_op (NE_EXPR, expr, integer_zero_node, 1), | |
286 | but we optimize comparisons, &&, ||, and !. | |
287 | ||
288 | The result should be an expression of boolean type (if not an | |
289 | error_mark_node). */ | |
3ad4992f | 290 | tree (*truthvalue_conversion) (tree); |
aff9e656 | 291 | |
b3187c7c | 292 | /* Hook called by safe_from_p for language-specific tree codes. It is |
293 | up to the language front-end to install a hook if it has any such | |
294 | codes that safe_from_p needs to know about. Since same_from_p will | |
295 | recursively explore the TREE_OPERANDs of an expression, this hook | |
296 | should not reexamine those pieces. This routine may recursively | |
297 | call safe_from_p; it should always pass `0' as the TOP_P | |
298 | parameter. */ | |
3ad4992f | 299 | int (*safe_from_p) (rtx, tree); |
b3187c7c | 300 | |
ee23fd7b | 301 | /* Function to finish handling an incomplete decl at the end of |
302 | compilation. Default hook is does nothing. */ | |
3ad4992f | 303 | void (*finish_incomplete_decl) (tree); |
ee23fd7b | 304 | |
9b86eec0 | 305 | /* Mark EXP saying that we need to be able to take the address of |
306 | it; it should not be allocated in a register. Return true if | |
307 | successful. */ | |
3ad4992f | 308 | bool (*mark_addressable) (tree); |
9b86eec0 | 309 | |
f1833f1b | 310 | /* Hook called by staticp for language-specific tree codes. */ |
82e3f297 | 311 | tree (*staticp) (tree); |
f1833f1b | 312 | |
dbc42b78 | 313 | /* Replace the DECL_LANG_SPECIFIC data, which may be NULL, of the |
314 | DECL_NODE with a newly GC-allocated copy. */ | |
3ad4992f | 315 | void (*dup_lang_specific_decl) (tree); |
dbc42b78 | 316 | |
d1f6c8f2 | 317 | /* Set the DECL_ASSEMBLER_NAME for a node. If it is the sort of |
318 | thing that the assembler should talk about, set | |
319 | DECL_ASSEMBLER_NAME to an appropriate IDENTIFIER_NODE. | |
320 | Otherwise, set it to the ERROR_MARK_NODE to ensure that the | |
321 | assembler does not talk about it. */ | |
3ad4992f | 322 | void (*set_decl_assembler_name) (tree); |
d1f6c8f2 | 323 | |
d50b22af | 324 | /* Return nonzero if fold-const is free to use bit-field |
325 | optimizations, for instance in fold_truthop(). */ | |
3ad4992f | 326 | bool (*can_use_bit_fields_p) (void); |
d50b22af | 327 | |
4f7f7efd | 328 | /* Nonzero if operations on types narrower than their mode should |
329 | have their results reduced to the precision of the type. */ | |
330 | bool reduce_bit_field_operations; | |
331 | ||
685b5cc2 | 332 | /* Nonzero if this front end does not generate a dummy BLOCK between |
333 | the outermost scope of the function and the FUNCTION_DECL. See | |
334 | is_body_block in stmt.c, and its callers. */ | |
335 | bool no_body_blocks; | |
336 | ||
b7fced5e | 337 | /* The front end can add its own statistics to -fmem-report with |
338 | this hook. It should output to stderr. */ | |
3ad4992f | 339 | void (*print_statistics) (void); |
b7fced5e | 340 | |
341 | /* Called by print_tree when there is a tree of class 'x' that it | |
342 | doesn't know how to display. */ | |
343 | lang_print_tree_hook print_xnode; | |
344 | ||
345 | /* Called to print language-dependent parts of a class 'd', class | |
346 | 't', and IDENTIFIER_NODE nodes. */ | |
347 | lang_print_tree_hook print_decl; | |
348 | lang_print_tree_hook print_type; | |
349 | lang_print_tree_hook print_identifier; | |
350 | ||
96554925 | 351 | /* Computes the name to use to print a declaration. DECL is the |
352 | non-NULL declaration in question. VERBOSITY determines what | |
353 | information will be printed: 0: DECL_NAME, demangled as | |
354 | necessary. 1: and scope information. 2: and any other | |
355 | information that might be interesting, such as function parameter | |
356 | types in C++. */ | |
3ad4992f | 357 | const char *(*decl_printable_name) (tree decl, int verbosity); |
96554925 | 358 | |
4ee9c684 | 359 | /* This compares two types for equivalence ("compatible" in C-based languages). |
360 | This routine should only return 1 if it is sure. It should not be used | |
361 | in contexts where erroneously returning 0 causes problems. */ | |
362 | int (*types_compatible_p) (tree x, tree y); | |
363 | ||
264f4f30 | 364 | /* Given a CALL_EXPR, return a function decl that is its target. */ |
365 | tree (*lang_get_callee_fndecl) (tree); | |
366 | ||
6c7ff025 | 367 | /* Called by report_error_function to print out function name. */ |
3ad4992f | 368 | void (*print_error_function) (struct diagnostic_context *, const char *); |
6c7ff025 | 369 | |
c3f16ae3 | 370 | /* Called from expr_size to calculate the size of the value of an |
371 | expression in a language-dependent way. Returns a tree for the size | |
372 | in bytes. A frontend can call lhd_expr_size to get the default | |
373 | semantics in cases that it doesn't want to handle specially. */ | |
3ad4992f | 374 | tree (*expr_size) (tree); |
c3f16ae3 | 375 | |
f8e93a2e | 376 | /* Pointers to machine-independent attribute tables, for front ends |
377 | using attribs.c. If one is NULL, it is ignored. Respectively, a | |
378 | table of attributes specific to the language, a table of | |
379 | attributes common to two or more languages (to allow easy | |
380 | sharing), and a table of attributes for checking formats. */ | |
381 | const struct attribute_spec *attribute_table; | |
382 | const struct attribute_spec *common_attribute_table; | |
383 | const struct attribute_spec *format_attribute_table; | |
384 | ||
c80c4f22 | 385 | /* Function-related language hooks. */ |
386 | struct lang_hooks_for_functions function; | |
387 | ||
b0278d39 | 388 | struct lang_hooks_for_tree_inlining tree_inlining; |
8851e806 | 389 | |
833eb724 | 390 | struct lang_hooks_for_callgraph callgraph; |
391 | ||
3119c950 | 392 | struct lang_hooks_for_tree_dump tree_dump; |
b0278d39 | 393 | |
20325f61 | 394 | struct lang_hooks_for_decls decls; |
395 | ||
a1f71e15 | 396 | struct lang_hooks_for_types types; |
397 | ||
4ee9c684 | 398 | /* Perform language-specific gimplification on the argument. Returns an |
399 | enum gimplify_status, though we can't see that type here. */ | |
400 | int (*gimplify_expr) (tree *, tree *, tree *); | |
401 | ||
215e2f1d | 402 | /* Fold an OBJ_TYPE_REF expression to the address of a function. |
403 | KNOWN_TYPE carries the true type of the OBJ_TYPE_REF_OBJECT. */ | |
404 | tree (*fold_obj_type_ref) (tree, tree); | |
405 | ||
e60d3615 | 406 | /* Return a definition for a builtin function named NAME and whose data type |
407 | is TYPE. TYPE should be a function type with argument types. | |
408 | FUNCTION_CODE tells later passes how to compile calls to this function. | |
409 | See tree.h for its possible values. | |
410 | ||
411 | If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME, | |
412 | the name to be called if we can't opencode the function. If | |
413 | ATTRS is nonzero, use that for the function's attribute list. */ | |
414 | tree (*builtin_function) (const char *name, tree type, int function_code, | |
8eb0977a | 415 | enum built_in_class bt_class, |
e60d3615 | 416 | const char *library_name, tree attrs); |
417 | ||
3119c950 | 418 | /* Whenever you add entries here, make sure you adjust langhooks-def.h |
b0278d39 | 419 | and langhooks.c accordingly. */ |
420 | }; | |
421 | ||
422 | /* Each front end provides its own. */ | |
d19bd1f0 | 423 | extern const struct lang_hooks lang_hooks; |
e8602e56 | 424 | |
425 | #endif /* GCC_LANG_HOOKS_H */ |