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b0278d39 | 1 | /* The lang_hooks data structure. |
20325f61 | 2 | Copyright 2001, 2002 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 (). */ |
29 | typedef void (*lang_print_tree_hook) PARAMS ((FILE *, tree, int indent)); | |
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 | { | |
36 | union tree_node *(*walk_subtrees) PARAMS ((union tree_node **, int *, | |
37 | union tree_node *(*) | |
38 | (union tree_node **, | |
39 | int *, void *), | |
40 | void *, void *)); | |
41 | int (*cannot_inline_tree_fn) PARAMS ((union tree_node **)); | |
42 | int (*disregard_inline_limits) PARAMS ((union tree_node *)); | |
43 | union tree_node *(*add_pending_fn_decls) PARAMS ((void *, | |
44 | union tree_node *)); | |
45 | int (*tree_chain_matters_p) PARAMS ((union tree_node *)); | |
46 | int (*auto_var_in_fn_p) PARAMS ((union tree_node *, union tree_node *)); | |
47 | union tree_node *(*copy_res_decl_for_inlining) PARAMS ((union tree_node *, | |
48 | union tree_node *, | |
49 | union tree_node *, | |
50 | void *, int *, | |
805e22b2 | 51 | tree)); |
b0278d39 | 52 | int (*anon_aggr_type_p) PARAMS ((union tree_node *)); |
21ac3a84 | 53 | bool (*var_mod_type_p) PARAMS ((union tree_node *)); |
054e01a7 | 54 | int (*start_inlining) PARAMS ((union tree_node *)); |
55 | void (*end_inlining) PARAMS ((union tree_node *)); | |
78b80426 | 56 | union tree_node *(*convert_parm_for_inlining) PARAMS ((union tree_node *, |
57 | union tree_node *, | |
58 | union tree_node *)); | |
b0278d39 | 59 | }; |
60 | ||
833eb724 | 61 | struct lang_hooks_for_callgraph |
62 | { | |
63 | /* Function passed as argument is needed and will be compiled. | |
64 | Lower the representation so the calls are explicit. */ | |
65 | void (*lower_function) PARAMS ((union tree_node *)); | |
66 | /* Produce RTL for function passed as argument. */ | |
67 | void (*expand_function) PARAMS ((union tree_node *)); | |
68 | }; | |
69 | ||
c80c4f22 | 70 | /* Lang hooks for management of language-specific data or status |
71 | when entering / leaving functions etc. */ | |
72 | struct lang_hooks_for_functions | |
73 | { | |
74 | /* Called when entering a function. */ | |
75 | void (*init) PARAMS ((struct function *)); | |
76 | ||
77 | /* Called when leaving a function. */ | |
1f3233d1 | 78 | void (*final) PARAMS ((struct function *)); |
c80c4f22 | 79 | |
80 | /* Called when entering a nested function. */ | |
81 | void (*enter_nested) PARAMS ((struct function *)); | |
82 | ||
83 | /* Called when leaving a nested function. */ | |
84 | void (*leave_nested) PARAMS ((struct function *)); | |
c80c4f22 | 85 | }; |
86 | ||
3119c950 | 87 | /* The following hooks are used by tree-dump.c. */ |
88 | ||
89 | struct lang_hooks_for_tree_dump | |
90 | { | |
6ef828f9 | 91 | /* Dump language-specific parts of tree nodes. Returns nonzero if it |
3119c950 | 92 | does not want the usual dumping of the second argument. */ |
fb84380a | 93 | bool (*dump_tree) PARAMS ((void *, tree)); |
3119c950 | 94 | |
95 | /* Determine type qualifiers in a language-specific way. */ | |
96 | int (*type_quals) PARAMS ((tree)); | |
97 | }; | |
98 | ||
a1f71e15 | 99 | /* Hooks related to types. */ |
100 | ||
101 | struct lang_hooks_for_types | |
102 | { | |
771d21fa | 103 | /* Return a new type (with the indicated CODE), doing whatever |
104 | language-specific processing is required. */ | |
a1f71e15 | 105 | tree (*make_type) PARAMS ((enum tree_code)); |
8851e806 | 106 | |
771d21fa | 107 | /* Given MODE and UNSIGNEDP, return a suitable type-tree with that |
108 | mode. */ | |
109 | tree (*type_for_mode) PARAMS ((enum machine_mode, int)); | |
110 | ||
111 | /* Given PRECISION and UNSIGNEDP, return a suitable type-tree for an | |
112 | integer type with at least that precision. */ | |
113 | tree (*type_for_size) PARAMS ((unsigned, int)); | |
4070745f | 114 | |
115 | /* Given an integer type T, return a type like T but unsigned. | |
116 | If T is unsigned, the value is T. */ | |
117 | tree (*unsigned_type) PARAMS ((tree)); | |
118 | ||
119 | /* Given an integer type T, return a type like T but signed. | |
120 | If T is signed, the value is T. */ | |
121 | tree (*signed_type) PARAMS ((tree)); | |
122 | ||
123 | /* Return a type the same as TYPE except unsigned or signed | |
124 | according to UNSIGNEDP. */ | |
125 | tree (*signed_or_unsigned_type) PARAMS ((int, tree)); | |
1dd25100 | 126 | |
63c62881 | 127 | /* Given a type, apply default promotions to unnamed function |
128 | arguments and return the new type. Return the same type if no | |
129 | change. Required by any language that supports variadic | |
130 | arguments. The default hook aborts. */ | |
131 | tree (*type_promotes_to) PARAMS ((tree)); | |
132 | ||
1dd25100 | 133 | /* This routine is called in tree.c to print an error message for |
134 | invalid use of an incomplete type. VALUE is the expression that | |
135 | was used (or 0 if that isn't known) and TYPE is the type that was | |
136 | invalid. */ | |
137 | void (*incomplete_type_error) PARAMS ((tree value, tree type)); | |
a1f71e15 | 138 | }; |
139 | ||
20325f61 | 140 | /* Language hooks related to decls and the symbol table. */ |
141 | ||
142 | struct lang_hooks_for_decls | |
143 | { | |
144 | /* Enter a new lexical scope. Argument is always zero when called | |
145 | from outside the front end. */ | |
146 | void (*pushlevel) PARAMS ((int)); | |
147 | ||
148 | /* Exit a lexical scope and return a BINDING for that scope. | |
149 | Takes three arguments: | |
150 | KEEP -- nonzero if there were declarations in this scope. | |
151 | REVERSE -- reverse the order of decls before returning them. | |
152 | FUNCTIONBODY -- nonzero if this level is the body of a function. */ | |
153 | tree (*poplevel) PARAMS ((int, int, int)); | |
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. */ |
157 | int (*global_bindings_p) PARAMS ((void)); | |
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. */ | |
162 | void (*insert_block) PARAMS ((tree)); | |
163 | ||
164 | /* Set the BLOCK node for the current scope level. */ | |
165 | void (*set_block) PARAMS ((tree)); | |
166 | ||
167 | /* Function to add a decl to the current scope level. Takes one | |
168 | argument, a decl to add. Returns that decl, or, if the same | |
169 | symbol is already declared, may return a different decl for that | |
170 | name. */ | |
171 | tree (*pushdecl) PARAMS ((tree)); | |
172 | ||
173 | /* Returns the chain of decls so far in the current scope level. */ | |
174 | tree (*getdecls) PARAMS ((void)); | |
8d58a5a7 | 175 | |
176 | /* Returns true when we should warn for an unused global DECL. | |
177 | We will already have checked that it has static binding. */ | |
178 | bool (*warn_unused_global) PARAMS ((tree)); | |
28db4d96 | 179 | |
180 | /* Obtain a list of globals and do final output on them at end | |
181 | of compilation */ | |
182 | void (*final_write_globals) PARAMS ((void)); | |
e2e9c55b | 183 | |
184 | /* True if this decl may be called via a sibcall. */ | |
185 | bool (*ok_for_sibcall) PARAMS ((tree)); | |
20325f61 | 186 | }; |
187 | ||
b0278d39 | 188 | /* Language-specific hooks. See langhooks-def.h for defaults. */ |
189 | ||
190 | struct lang_hooks | |
191 | { | |
d19bd1f0 | 192 | /* String identifying the front end. e.g. "GNU C++". */ |
193 | const char *name; | |
194 | ||
195 | /* sizeof (struct lang_identifier), so make_node () creates | |
196 | identifier nodes long enough for the language-specific slots. */ | |
197 | size_t identifier_size; | |
198 | ||
295e387a | 199 | /* Determines the size of any language-specific 'x' or 'c' nodes. |
200 | Since it is called from make_node, the only information available | |
201 | is the tree code. Expected to abort on unrecognized codes. */ | |
202 | size_t (*tree_size) PARAMS ((enum tree_code)); | |
203 | ||
435fb09b | 204 | /* The first callback made to the front end, for simple |
5457b645 | 205 | initialization needed before any calls to handle_option. Return |
206 | the language mask to filter the switch array with. */ | |
207 | int (*init_options) PARAMS ((void)); | |
b0278d39 | 208 | |
5457b645 | 209 | /* Handle the switch CODE, which has real type enum opt_code from |
210 | options.h. If the switch takes an argument, it is passed in ARG | |
211 | which points to permanent storage. The handler is resonsible for | |
212 | checking whether ARG is NULL, which indicates that no argument | |
213 | was in fact supplied. For -f and -W switches, VALUE is 1 or 0 | |
214 | for the positive and negative forms respectively. | |
215 | ||
216 | Return 1 if the switch is valid, 0 if invalid, and -1 if it's | |
217 | valid and should not be treated as language-independent too. */ | |
218 | int (*handle_option) (size_t code, const char *arg, int value); | |
219 | ||
03bde601 | 220 | /* Called when all command line options have been parsed to allow |
221 | further processing and initialization | |
dd436eaf | 222 | |
03bde601 | 223 | Should return true to indicate that a compiler back-end is |
224 | not required, such as with the -E option. | |
77e1a5df | 225 | |
6ef828f9 | 226 | If errorcount is nonzero after this call the compiler exits |
dd436eaf | 227 | immediately and the finish hook is not called. */ |
03bde601 | 228 | bool (*post_options) PARAMS ((const char **)); |
229 | ||
230 | /* Called after post_options to initialize the front end. Return | |
231 | false to indicate that no further compilation be performed, in | |
232 | which case the finish hook is called immediately. */ | |
233 | bool (*init) PARAMS ((void)); | |
435fb09b | 234 | |
235 | /* Called at the end of compilation, as a finalizer. */ | |
236 | void (*finish) PARAMS ((void)); | |
237 | ||
6ef828f9 | 238 | /* Parses the entire file. The argument is nonzero to cause bison |
1c542e4c | 239 | parsers to dump debugging information during parsing. */ |
240 | void (*parse_file) PARAMS ((int)); | |
b78207a0 | 241 | |
435fb09b | 242 | /* Called immediately after parsing to clear the binding stack. */ |
243 | void (*clear_binding_stack) PARAMS ((void)); | |
244 | ||
b0278d39 | 245 | /* Called to obtain the alias set to be used for an expression or type. |
246 | Returns -1 if the language does nothing special for it. */ | |
247 | HOST_WIDE_INT (*get_alias_set) PARAMS ((tree)); | |
248 | ||
b3187c7c | 249 | /* Called with an expression that is to be processed as a constant. |
250 | Returns either the same expression or a language-independent | |
251 | constant equivalent to its input. */ | |
252 | tree (*expand_constant) PARAMS ((tree)); | |
253 | ||
b467ecc1 | 254 | /* Called by expand_expr for language-specific tree codes. |
255 | Fourth argument is actually an enum expand_modifier. */ | |
256 | rtx (*expand_expr) PARAMS ((tree, rtx, enum machine_mode, int)); | |
257 | ||
aff9e656 | 258 | /* Prepare expr to be an argument of a TRUTH_NOT_EXPR or other logical |
259 | operation. | |
260 | ||
261 | This preparation consists of taking the ordinary representation | |
262 | of an expression expr and producing a valid tree boolean | |
263 | expression describing whether expr is nonzero. We could simply | |
264 | always do build_binary_op (NE_EXPR, expr, integer_zero_node, 1), | |
265 | but we optimize comparisons, &&, ||, and !. | |
266 | ||
267 | The result should be an expression of boolean type (if not an | |
268 | error_mark_node). */ | |
269 | tree (*truthvalue_conversion) PARAMS ((tree)); | |
270 | ||
26ca6c20 | 271 | /* Possibly apply default attributes to a function (represented by |
272 | a FUNCTION_DECL). */ | |
273 | void (*insert_default_attributes) PARAMS ((tree)); | |
274 | ||
b3187c7c | 275 | /* Hook called by safe_from_p for language-specific tree codes. It is |
276 | up to the language front-end to install a hook if it has any such | |
277 | codes that safe_from_p needs to know about. Since same_from_p will | |
278 | recursively explore the TREE_OPERANDs of an expression, this hook | |
279 | should not reexamine those pieces. This routine may recursively | |
280 | call safe_from_p; it should always pass `0' as the TOP_P | |
281 | parameter. */ | |
282 | int (*safe_from_p) PARAMS ((rtx, tree)); | |
283 | ||
ee23fd7b | 284 | /* Function to finish handling an incomplete decl at the end of |
285 | compilation. Default hook is does nothing. */ | |
286 | void (*finish_incomplete_decl) PARAMS ((tree)); | |
287 | ||
288 | /* Function used by unsafe_for_reeval. A non-negative number is | |
289 | returned directly from unsafe_for_reeval, a negative number falls | |
290 | through. The default hook returns a negative number. */ | |
291 | int (*unsafe_for_reeval) PARAMS ((tree)); | |
292 | ||
9b86eec0 | 293 | /* Mark EXP saying that we need to be able to take the address of |
294 | it; it should not be allocated in a register. Return true if | |
295 | successful. */ | |
296 | bool (*mark_addressable) PARAMS ((tree)); | |
297 | ||
f1833f1b | 298 | /* Hook called by staticp for language-specific tree codes. */ |
299 | int (*staticp) PARAMS ((tree)); | |
300 | ||
dbc42b78 | 301 | /* Replace the DECL_LANG_SPECIFIC data, which may be NULL, of the |
302 | DECL_NODE with a newly GC-allocated copy. */ | |
303 | void (*dup_lang_specific_decl) PARAMS ((tree)); | |
304 | ||
1d347c23 | 305 | /* Called before its argument, an UNSAVE_EXPR, is to be |
306 | unsaved. Modify it in-place so that all the evaluate only once | |
307 | things are cleared out. */ | |
308 | tree (*unsave_expr_now) PARAMS ((tree)); | |
309 | ||
04745efb | 310 | /* Called by expand_expr to build and return the cleanup-expression |
311 | for the passed TARGET_EXPR. Return NULL if there is none. */ | |
312 | tree (*maybe_build_cleanup) PARAMS ((tree)); | |
313 | ||
d1f6c8f2 | 314 | /* Set the DECL_ASSEMBLER_NAME for a node. If it is the sort of |
315 | thing that the assembler should talk about, set | |
316 | DECL_ASSEMBLER_NAME to an appropriate IDENTIFIER_NODE. | |
317 | Otherwise, set it to the ERROR_MARK_NODE to ensure that the | |
318 | assembler does not talk about it. */ | |
319 | void (*set_decl_assembler_name) PARAMS ((tree)); | |
320 | ||
d50b22af | 321 | /* Return nonzero if fold-const is free to use bit-field |
322 | optimizations, for instance in fold_truthop(). */ | |
323 | bool (*can_use_bit_fields_p) PARAMS ((void)); | |
324 | ||
b0278d39 | 325 | /* Nonzero if TYPE_READONLY and TREE_READONLY should always be honored. */ |
326 | bool honor_readonly; | |
327 | ||
b7fced5e | 328 | /* The front end can add its own statistics to -fmem-report with |
329 | this hook. It should output to stderr. */ | |
330 | void (*print_statistics) PARAMS ((void)); | |
331 | ||
332 | /* Called by print_tree when there is a tree of class 'x' that it | |
333 | doesn't know how to display. */ | |
334 | lang_print_tree_hook print_xnode; | |
335 | ||
336 | /* Called to print language-dependent parts of a class 'd', class | |
337 | 't', and IDENTIFIER_NODE nodes. */ | |
338 | lang_print_tree_hook print_decl; | |
339 | lang_print_tree_hook print_type; | |
340 | lang_print_tree_hook print_identifier; | |
341 | ||
96554925 | 342 | /* Computes the name to use to print a declaration. DECL is the |
343 | non-NULL declaration in question. VERBOSITY determines what | |
344 | information will be printed: 0: DECL_NAME, demangled as | |
345 | necessary. 1: and scope information. 2: and any other | |
346 | information that might be interesting, such as function parameter | |
347 | types in C++. */ | |
348 | const char *(*decl_printable_name) PARAMS ((tree decl, int verbosity)); | |
349 | ||
6c7ff025 | 350 | /* Called by report_error_function to print out function name. */ |
351 | void (*print_error_function) PARAMS ((struct diagnostic_context *, | |
352 | const char *)); | |
353 | ||
c3f16ae3 | 354 | /* Called from expr_size to calculate the size of the value of an |
355 | expression in a language-dependent way. Returns a tree for the size | |
356 | in bytes. A frontend can call lhd_expr_size to get the default | |
357 | semantics in cases that it doesn't want to handle specially. */ | |
358 | tree (*expr_size) PARAMS ((tree)); | |
359 | ||
f8e93a2e | 360 | /* Pointers to machine-independent attribute tables, for front ends |
361 | using attribs.c. If one is NULL, it is ignored. Respectively, a | |
362 | table of attributes specific to the language, a table of | |
363 | attributes common to two or more languages (to allow easy | |
364 | sharing), and a table of attributes for checking formats. */ | |
365 | const struct attribute_spec *attribute_table; | |
366 | const struct attribute_spec *common_attribute_table; | |
367 | const struct attribute_spec *format_attribute_table; | |
368 | ||
c80c4f22 | 369 | /* Function-related language hooks. */ |
370 | struct lang_hooks_for_functions function; | |
371 | ||
b0278d39 | 372 | struct lang_hooks_for_tree_inlining tree_inlining; |
8851e806 | 373 | |
833eb724 | 374 | struct lang_hooks_for_callgraph callgraph; |
375 | ||
3119c950 | 376 | struct lang_hooks_for_tree_dump tree_dump; |
b0278d39 | 377 | |
20325f61 | 378 | struct lang_hooks_for_decls decls; |
379 | ||
a1f71e15 | 380 | struct lang_hooks_for_types types; |
381 | ||
3119c950 | 382 | /* Whenever you add entries here, make sure you adjust langhooks-def.h |
b0278d39 | 383 | and langhooks.c accordingly. */ |
384 | }; | |
385 | ||
386 | /* Each front end provides its own. */ | |
d19bd1f0 | 387 | extern const struct lang_hooks lang_hooks; |
e8602e56 | 388 | |
389 | #endif /* GCC_LANG_HOOKS_H */ |