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b0278d39 | 1 | /* The lang_hooks data structure. |
3ad4992f | 2 | Copyright 2001, 2002, 2003 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); | |
42 | int (*tree_chain_matters_p) (tree); | |
43 | int (*auto_var_in_fn_p) (tree, tree); | |
44 | tree (*copy_res_decl_for_inlining) (tree, tree, tree, | |
45 | void *, int *, tree); | |
46 | int (*anon_aggr_type_p) (tree); | |
47 | bool (*var_mod_type_p) (tree); | |
48 | int (*start_inlining) (tree); | |
49 | void (*end_inlining) (tree); | |
50 | tree (*convert_parm_for_inlining) (tree, tree, tree); | |
51 | int (*estimate_num_insns) (tree); | |
b0278d39 | 52 | }; |
53 | ||
833eb724 | 54 | struct lang_hooks_for_callgraph |
55 | { | |
56 | /* Function passed as argument is needed and will be compiled. | |
57 | Lower the representation so the calls are explicit. */ | |
00ea394c | 58 | void (*lower_function) (tree); |
833eb724 | 59 | /* Produce RTL for function passed as argument. */ |
00ea394c | 60 | void (*expand_function) (tree); |
833eb724 | 61 | }; |
62 | ||
c80c4f22 | 63 | /* Lang hooks for management of language-specific data or status |
64 | when entering / leaving functions etc. */ | |
65 | struct lang_hooks_for_functions | |
66 | { | |
67 | /* Called when entering a function. */ | |
3ad4992f | 68 | void (*init) (struct function *); |
c80c4f22 | 69 | |
70 | /* Called when leaving a function. */ | |
3ad4992f | 71 | void (*final) (struct function *); |
c80c4f22 | 72 | |
73 | /* Called when entering a nested function. */ | |
3ad4992f | 74 | void (*enter_nested) (struct function *); |
c80c4f22 | 75 | |
76 | /* Called when leaving a nested function. */ | |
3ad4992f | 77 | void (*leave_nested) (struct function *); |
c80c4f22 | 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 | |
1dd25100 | 126 | /* This routine is called in tree.c to print an error message for |
127 | invalid use of an incomplete type. VALUE is the expression that | |
128 | was used (or 0 if that isn't known) and TYPE is the type that was | |
129 | invalid. */ | |
3ad4992f | 130 | void (*incomplete_type_error) (tree value, tree type); |
a1f71e15 | 131 | }; |
132 | ||
20325f61 | 133 | /* Language hooks related to decls and the symbol table. */ |
134 | ||
135 | struct lang_hooks_for_decls | |
136 | { | |
137 | /* Enter a new lexical scope. Argument is always zero when called | |
138 | from outside the front end. */ | |
3ad4992f | 139 | void (*pushlevel) (int); |
20325f61 | 140 | |
141 | /* Exit a lexical scope and return a BINDING for that scope. | |
142 | Takes three arguments: | |
143 | KEEP -- nonzero if there were declarations in this scope. | |
144 | REVERSE -- reverse the order of decls before returning them. | |
145 | FUNCTIONBODY -- nonzero if this level is the body of a function. */ | |
3ad4992f | 146 | tree (*poplevel) (int, int, int); |
20325f61 | 147 | |
6ef828f9 | 148 | /* Returns nonzero if we are in the global binding level. Ada |
20325f61 | 149 | returns -1 for an undocumented reason used in stor-layout.c. */ |
3ad4992f | 150 | int (*global_bindings_p) (void); |
20325f61 | 151 | |
152 | /* Insert BLOCK at the end of the list of subblocks of the | |
153 | current binding level. This is used when a BIND_EXPR is expanded, | |
154 | to handle the BLOCK node inside the BIND_EXPR. */ | |
3ad4992f | 155 | void (*insert_block) (tree); |
20325f61 | 156 | |
157 | /* Set the BLOCK node for the current scope level. */ | |
3ad4992f | 158 | void (*set_block) (tree); |
20325f61 | 159 | |
160 | /* Function to add a decl to the current scope level. Takes one | |
161 | argument, a decl to add. Returns that decl, or, if the same | |
162 | symbol is already declared, may return a different decl for that | |
163 | name. */ | |
3ad4992f | 164 | tree (*pushdecl) (tree); |
20325f61 | 165 | |
166 | /* Returns the chain of decls so far in the current scope level. */ | |
3ad4992f | 167 | tree (*getdecls) (void); |
8d58a5a7 | 168 | |
169 | /* Returns true when we should warn for an unused global DECL. | |
170 | We will already have checked that it has static binding. */ | |
3ad4992f | 171 | bool (*warn_unused_global) (tree); |
28db4d96 | 172 | |
173 | /* Obtain a list of globals and do final output on them at end | |
174 | of compilation */ | |
3ad4992f | 175 | void (*final_write_globals) (void); |
e2e9c55b | 176 | |
8efca15a | 177 | /* Do necessary preparations before assemble_variable can proceed. */ |
3ad4992f | 178 | void (*prepare_assemble_variable) (tree); |
8efca15a | 179 | |
e2e9c55b | 180 | /* True if this decl may be called via a sibcall. */ |
3ad4992f | 181 | bool (*ok_for_sibcall) (tree); |
20325f61 | 182 | }; |
183 | ||
b0278d39 | 184 | /* Language-specific hooks. See langhooks-def.h for defaults. */ |
185 | ||
186 | struct lang_hooks | |
187 | { | |
d19bd1f0 | 188 | /* String identifying the front end. e.g. "GNU C++". */ |
189 | const char *name; | |
190 | ||
191 | /* sizeof (struct lang_identifier), so make_node () creates | |
192 | identifier nodes long enough for the language-specific slots. */ | |
193 | size_t identifier_size; | |
194 | ||
295e387a | 195 | /* Determines the size of any language-specific 'x' or 'c' nodes. |
196 | Since it is called from make_node, the only information available | |
197 | is the tree code. Expected to abort on unrecognized codes. */ | |
3ad4992f | 198 | size_t (*tree_size) (enum tree_code); |
295e387a | 199 | |
435fb09b | 200 | /* The first callback made to the front end, for simple |
5457b645 | 201 | initialization needed before any calls to handle_option. Return |
202 | the language mask to filter the switch array with. */ | |
4838a8b6 | 203 | unsigned int (*init_options) (unsigned int argc, const char **argv); |
b0278d39 | 204 | |
f63da8d3 | 205 | /* Callback used to perform language-specific initialization for the |
206 | global diagnostic context structure. */ | |
207 | void (*initialize_diagnostics) (struct diagnostic_context *); | |
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 | |
917bbcab | 211 | which points to permanent storage. The handler is responsible for |
5457b645 | 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 | ||
76bf7746 | 220 | /* Return false to use the default complaint about a missing |
221 | argument, otherwise output a complaint and return true. */ | |
222 | bool (*missing_argument) (const char *opt, size_t code); | |
223 | ||
03bde601 | 224 | /* Called when all command line options have been parsed to allow |
225 | further processing and initialization | |
dd436eaf | 226 | |
03bde601 | 227 | Should return true to indicate that a compiler back-end is |
228 | not required, such as with the -E option. | |
3ad4992f | 229 | |
6ef828f9 | 230 | If errorcount is nonzero after this call the compiler exits |
dd436eaf | 231 | immediately and the finish hook is not called. */ |
3ad4992f | 232 | bool (*post_options) (const char **); |
03bde601 | 233 | |
234 | /* Called after post_options to initialize the front end. Return | |
235 | false to indicate that no further compilation be performed, in | |
236 | which case the finish hook is called immediately. */ | |
3ad4992f | 237 | bool (*init) (void); |
435fb09b | 238 | |
239 | /* Called at the end of compilation, as a finalizer. */ | |
3ad4992f | 240 | void (*finish) (void); |
435fb09b | 241 | |
6ef828f9 | 242 | /* Parses the entire file. The argument is nonzero to cause bison |
1c542e4c | 243 | parsers to dump debugging information during parsing. */ |
3ad4992f | 244 | void (*parse_file) (int); |
b78207a0 | 245 | |
435fb09b | 246 | /* Called immediately after parsing to clear the binding stack. */ |
3ad4992f | 247 | void (*clear_binding_stack) (void); |
435fb09b | 248 | |
b0278d39 | 249 | /* Called to obtain the alias set to be used for an expression or type. |
250 | Returns -1 if the language does nothing special for it. */ | |
3ad4992f | 251 | HOST_WIDE_INT (*get_alias_set) (tree); |
b0278d39 | 252 | |
b3187c7c | 253 | /* Called with an expression that is to be processed as a constant. |
254 | Returns either the same expression or a language-independent | |
255 | constant equivalent to its input. */ | |
3ad4992f | 256 | tree (*expand_constant) (tree); |
b3187c7c | 257 | |
b467ecc1 | 258 | /* Called by expand_expr for language-specific tree codes. |
259 | Fourth argument is actually an enum expand_modifier. */ | |
3ad4992f | 260 | rtx (*expand_expr) (tree, rtx, enum machine_mode, int); |
b467ecc1 | 261 | |
aff9e656 | 262 | /* Prepare expr to be an argument of a TRUTH_NOT_EXPR or other logical |
263 | operation. | |
264 | ||
265 | This preparation consists of taking the ordinary representation | |
266 | of an expression expr and producing a valid tree boolean | |
267 | expression describing whether expr is nonzero. We could simply | |
268 | always do build_binary_op (NE_EXPR, expr, integer_zero_node, 1), | |
269 | but we optimize comparisons, &&, ||, and !. | |
270 | ||
271 | The result should be an expression of boolean type (if not an | |
272 | error_mark_node). */ | |
3ad4992f | 273 | tree (*truthvalue_conversion) (tree); |
aff9e656 | 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. */ | |
3ad4992f | 282 | int (*safe_from_p) (rtx, tree); |
b3187c7c | 283 | |
ee23fd7b | 284 | /* Function to finish handling an incomplete decl at the end of |
285 | compilation. Default hook is does nothing. */ | |
3ad4992f | 286 | void (*finish_incomplete_decl) (tree); |
ee23fd7b | 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. */ | |
3ad4992f | 291 | int (*unsafe_for_reeval) (tree); |
ee23fd7b | 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. */ | |
3ad4992f | 296 | bool (*mark_addressable) (tree); |
9b86eec0 | 297 | |
f1833f1b | 298 | /* Hook called by staticp for language-specific tree codes. */ |
3ad4992f | 299 | int (*staticp) (tree); |
f1833f1b | 300 | |
dbc42b78 | 301 | /* Replace the DECL_LANG_SPECIFIC data, which may be NULL, of the |
302 | DECL_NODE with a newly GC-allocated copy. */ | |
3ad4992f | 303 | void (*dup_lang_specific_decl) (tree); |
dbc42b78 | 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. */ | |
3ad4992f | 308 | tree (*unsave_expr_now) (tree); |
1d347c23 | 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. */ | |
3ad4992f | 312 | tree (*maybe_build_cleanup) (tree); |
04745efb | 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. */ | |
3ad4992f | 319 | void (*set_decl_assembler_name) (tree); |
d1f6c8f2 | 320 | |
d50b22af | 321 | /* Return nonzero if fold-const is free to use bit-field |
322 | optimizations, for instance in fold_truthop(). */ | |
3ad4992f | 323 | bool (*can_use_bit_fields_p) (void); |
d50b22af | 324 | |
b0278d39 | 325 | /* Nonzero if TYPE_READONLY and TREE_READONLY should always be honored. */ |
326 | bool honor_readonly; | |
327 | ||
685b5cc2 | 328 | /* Nonzero if this front end does not generate a dummy BLOCK between |
329 | the outermost scope of the function and the FUNCTION_DECL. See | |
330 | is_body_block in stmt.c, and its callers. */ | |
331 | bool no_body_blocks; | |
332 | ||
b7fced5e | 333 | /* The front end can add its own statistics to -fmem-report with |
334 | this hook. It should output to stderr. */ | |
3ad4992f | 335 | void (*print_statistics) (void); |
b7fced5e | 336 | |
337 | /* Called by print_tree when there is a tree of class 'x' that it | |
338 | doesn't know how to display. */ | |
339 | lang_print_tree_hook print_xnode; | |
340 | ||
341 | /* Called to print language-dependent parts of a class 'd', class | |
342 | 't', and IDENTIFIER_NODE nodes. */ | |
343 | lang_print_tree_hook print_decl; | |
344 | lang_print_tree_hook print_type; | |
345 | lang_print_tree_hook print_identifier; | |
346 | ||
96554925 | 347 | /* Computes the name to use to print a declaration. DECL is the |
348 | non-NULL declaration in question. VERBOSITY determines what | |
349 | information will be printed: 0: DECL_NAME, demangled as | |
350 | necessary. 1: and scope information. 2: and any other | |
351 | information that might be interesting, such as function parameter | |
352 | types in C++. */ | |
3ad4992f | 353 | const char *(*decl_printable_name) (tree decl, int verbosity); |
96554925 | 354 | |
6c7ff025 | 355 | /* Called by report_error_function to print out function name. */ |
3ad4992f | 356 | void (*print_error_function) (struct diagnostic_context *, const char *); |
6c7ff025 | 357 | |
c3f16ae3 | 358 | /* Called from expr_size to calculate the size of the value of an |
359 | expression in a language-dependent way. Returns a tree for the size | |
360 | in bytes. A frontend can call lhd_expr_size to get the default | |
361 | semantics in cases that it doesn't want to handle specially. */ | |
3ad4992f | 362 | tree (*expr_size) (tree); |
c3f16ae3 | 363 | |
a0d8c66d | 364 | /* Called from uninitialized_vars_warning to find out if a variable is |
ca1fae79 | 365 | uninitialized based on DECL_INITIAL. */ |
a0d8c66d | 366 | bool (*decl_uninit) (tree); |
367 | ||
f8e93a2e | 368 | /* Pointers to machine-independent attribute tables, for front ends |
369 | using attribs.c. If one is NULL, it is ignored. Respectively, a | |
370 | table of attributes specific to the language, a table of | |
371 | attributes common to two or more languages (to allow easy | |
372 | sharing), and a table of attributes for checking formats. */ | |
373 | const struct attribute_spec *attribute_table; | |
374 | const struct attribute_spec *common_attribute_table; | |
375 | const struct attribute_spec *format_attribute_table; | |
376 | ||
c80c4f22 | 377 | /* Function-related language hooks. */ |
378 | struct lang_hooks_for_functions function; | |
379 | ||
b0278d39 | 380 | struct lang_hooks_for_tree_inlining tree_inlining; |
8851e806 | 381 | |
833eb724 | 382 | struct lang_hooks_for_callgraph callgraph; |
383 | ||
3119c950 | 384 | struct lang_hooks_for_tree_dump tree_dump; |
b0278d39 | 385 | |
20325f61 | 386 | struct lang_hooks_for_decls decls; |
387 | ||
a1f71e15 | 388 | struct lang_hooks_for_types types; |
389 | ||
3119c950 | 390 | /* Whenever you add entries here, make sure you adjust langhooks-def.h |
b0278d39 | 391 | and langhooks.c accordingly. */ |
392 | }; | |
393 | ||
394 | /* Each front end provides its own. */ | |
d19bd1f0 | 395 | extern const struct lang_hooks lang_hooks; |
e8602e56 | 396 | |
397 | #endif /* GCC_LANG_HOOKS_H */ |