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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 | { | |
3ad4992f | 36 | union tree_node *(*walk_subtrees) (union tree_node **, int *, |
37 | union tree_node *(*) | |
38 | (union tree_node **, int *, void *), | |
39 | void *, void *); | |
40 | int (*cannot_inline_tree_fn) (union tree_node **); | |
41 | int (*disregard_inline_limits) (union tree_node *); | |
42 | union tree_node *(*add_pending_fn_decls) (void *, union tree_node *); | |
43 | int (*tree_chain_matters_p) (union tree_node *); | |
44 | int (*auto_var_in_fn_p) (union tree_node *, union tree_node *); | |
45 | union tree_node *(*copy_res_decl_for_inlining) (union tree_node *, | |
46 | union tree_node *, | |
47 | union tree_node *, | |
48 | void *, int *, tree); | |
49 | int (*anon_aggr_type_p) (union tree_node *); | |
50 | bool (*var_mod_type_p) (union tree_node *); | |
51 | int (*start_inlining) (union tree_node *); | |
52 | void (*end_inlining) (union tree_node *); | |
53 | union tree_node *(*convert_parm_for_inlining) (union tree_node *, | |
54 | union tree_node *, | |
55 | union tree_node *); | |
309c7c52 | 56 | int (*estimate_num_insns) (union tree_node *); |
b0278d39 | 57 | }; |
58 | ||
833eb724 | 59 | struct lang_hooks_for_callgraph |
60 | { | |
61 | /* Function passed as argument is needed and will be compiled. | |
62 | Lower the representation so the calls are explicit. */ | |
3ad4992f | 63 | void (*lower_function) (union tree_node *); |
833eb724 | 64 | /* Produce RTL for function passed as argument. */ |
3ad4992f | 65 | void (*expand_function) (union tree_node *); |
833eb724 | 66 | }; |
67 | ||
c80c4f22 | 68 | /* Lang hooks for management of language-specific data or status |
69 | when entering / leaving functions etc. */ | |
70 | struct lang_hooks_for_functions | |
71 | { | |
72 | /* Called when entering a function. */ | |
3ad4992f | 73 | void (*init) (struct function *); |
c80c4f22 | 74 | |
75 | /* Called when leaving a function. */ | |
3ad4992f | 76 | void (*final) (struct function *); |
c80c4f22 | 77 | |
78 | /* Called when entering a nested function. */ | |
3ad4992f | 79 | void (*enter_nested) (struct function *); |
c80c4f22 | 80 | |
81 | /* Called when leaving a nested function. */ | |
3ad4992f | 82 | void (*leave_nested) (struct function *); |
c80c4f22 | 83 | }; |
84 | ||
3119c950 | 85 | /* The following hooks are used by tree-dump.c. */ |
86 | ||
87 | struct lang_hooks_for_tree_dump | |
88 | { | |
6ef828f9 | 89 | /* Dump language-specific parts of tree nodes. Returns nonzero if it |
3119c950 | 90 | does not want the usual dumping of the second argument. */ |
3ad4992f | 91 | bool (*dump_tree) (void *, tree); |
3119c950 | 92 | |
93 | /* Determine type qualifiers in a language-specific way. */ | |
3ad4992f | 94 | int (*type_quals) (tree); |
3119c950 | 95 | }; |
96 | ||
a1f71e15 | 97 | /* Hooks related to types. */ |
98 | ||
99 | struct lang_hooks_for_types | |
100 | { | |
771d21fa | 101 | /* Return a new type (with the indicated CODE), doing whatever |
102 | language-specific processing is required. */ | |
3ad4992f | 103 | tree (*make_type) (enum tree_code); |
8851e806 | 104 | |
771d21fa | 105 | /* Given MODE and UNSIGNEDP, return a suitable type-tree with that |
106 | mode. */ | |
3ad4992f | 107 | tree (*type_for_mode) (enum machine_mode, int); |
771d21fa | 108 | |
109 | /* Given PRECISION and UNSIGNEDP, return a suitable type-tree for an | |
110 | integer type with at least that precision. */ | |
3ad4992f | 111 | tree (*type_for_size) (unsigned, int); |
4070745f | 112 | |
113 | /* Given an integer type T, return a type like T but unsigned. | |
114 | If T is unsigned, the value is T. */ | |
3ad4992f | 115 | tree (*unsigned_type) (tree); |
4070745f | 116 | |
117 | /* Given an integer type T, return a type like T but signed. | |
118 | If T is signed, the value is T. */ | |
3ad4992f | 119 | tree (*signed_type) (tree); |
4070745f | 120 | |
121 | /* Return a type the same as TYPE except unsigned or signed | |
122 | according to UNSIGNEDP. */ | |
3ad4992f | 123 | tree (*signed_or_unsigned_type) (int, tree); |
1dd25100 | 124 | |
63c62881 | 125 | /* Given a type, apply default promotions to unnamed function |
126 | arguments and return the new type. Return the same type if no | |
127 | change. Required by any language that supports variadic | |
128 | arguments. The default hook aborts. */ | |
3ad4992f | 129 | tree (*type_promotes_to) (tree); |
63c62881 | 130 | |
1dd25100 | 131 | /* This routine is called in tree.c to print an error message for |
132 | invalid use of an incomplete type. VALUE is the expression that | |
133 | was used (or 0 if that isn't known) and TYPE is the type that was | |
134 | invalid. */ | |
3ad4992f | 135 | void (*incomplete_type_error) (tree value, tree type); |
a1f71e15 | 136 | }; |
137 | ||
20325f61 | 138 | /* Language hooks related to decls and the symbol table. */ |
139 | ||
140 | struct lang_hooks_for_decls | |
141 | { | |
142 | /* Enter a new lexical scope. Argument is always zero when called | |
143 | from outside the front end. */ | |
3ad4992f | 144 | void (*pushlevel) (int); |
20325f61 | 145 | |
146 | /* Exit a lexical scope and return a BINDING for that scope. | |
147 | Takes three arguments: | |
148 | KEEP -- nonzero if there were declarations in this scope. | |
149 | REVERSE -- reverse the order of decls before returning them. | |
150 | FUNCTIONBODY -- nonzero if this level is the body of a function. */ | |
3ad4992f | 151 | tree (*poplevel) (int, int, int); |
20325f61 | 152 | |
6ef828f9 | 153 | /* Returns nonzero if we are in the global binding level. Ada |
20325f61 | 154 | returns -1 for an undocumented reason used in stor-layout.c. */ |
3ad4992f | 155 | int (*global_bindings_p) (void); |
20325f61 | 156 | |
157 | /* Insert BLOCK at the end of the list of subblocks of the | |
158 | current binding level. This is used when a BIND_EXPR is expanded, | |
159 | to handle the BLOCK node inside the BIND_EXPR. */ | |
3ad4992f | 160 | void (*insert_block) (tree); |
20325f61 | 161 | |
162 | /* Set the BLOCK node for the current scope level. */ | |
3ad4992f | 163 | void (*set_block) (tree); |
20325f61 | 164 | |
165 | /* Function to add a decl to the current scope level. Takes one | |
166 | argument, a decl to add. Returns that decl, or, if the same | |
167 | symbol is already declared, may return a different decl for that | |
168 | name. */ | |
3ad4992f | 169 | tree (*pushdecl) (tree); |
20325f61 | 170 | |
171 | /* Returns the chain of decls so far in the current scope level. */ | |
3ad4992f | 172 | tree (*getdecls) (void); |
8d58a5a7 | 173 | |
174 | /* Returns true when we should warn for an unused global DECL. | |
175 | We will already have checked that it has static binding. */ | |
3ad4992f | 176 | bool (*warn_unused_global) (tree); |
28db4d96 | 177 | |
178 | /* Obtain a list of globals and do final output on them at end | |
179 | of compilation */ | |
3ad4992f | 180 | void (*final_write_globals) (void); |
e2e9c55b | 181 | |
8efca15a | 182 | /* Do necessary preparations before assemble_variable can proceed. */ |
3ad4992f | 183 | void (*prepare_assemble_variable) (tree); |
8efca15a | 184 | |
e2e9c55b | 185 | /* True if this decl may be called via a sibcall. */ |
3ad4992f | 186 | bool (*ok_for_sibcall) (tree); |
20325f61 | 187 | }; |
188 | ||
b0278d39 | 189 | /* Language-specific hooks. See langhooks-def.h for defaults. */ |
190 | ||
191 | struct lang_hooks | |
192 | { | |
d19bd1f0 | 193 | /* String identifying the front end. e.g. "GNU C++". */ |
194 | const char *name; | |
195 | ||
196 | /* sizeof (struct lang_identifier), so make_node () creates | |
197 | identifier nodes long enough for the language-specific slots. */ | |
198 | size_t identifier_size; | |
199 | ||
295e387a | 200 | /* Determines the size of any language-specific 'x' or 'c' nodes. |
201 | Since it is called from make_node, the only information available | |
202 | is the tree code. Expected to abort on unrecognized codes. */ | |
3ad4992f | 203 | size_t (*tree_size) (enum tree_code); |
295e387a | 204 | |
435fb09b | 205 | /* The first callback made to the front end, for simple |
5457b645 | 206 | initialization needed before any calls to handle_option. Return |
207 | the language mask to filter the switch array with. */ | |
4838a8b6 | 208 | unsigned int (*init_options) (unsigned int argc, const char **argv); |
b0278d39 | 209 | |
5457b645 | 210 | /* Handle the switch CODE, which has real type enum opt_code from |
211 | options.h. If the switch takes an argument, it is passed in ARG | |
917bbcab | 212 | which points to permanent storage. The handler is responsible for |
5457b645 | 213 | checking whether ARG is NULL, which indicates that no argument |
214 | was in fact supplied. For -f and -W switches, VALUE is 1 or 0 | |
215 | for the positive and negative forms respectively. | |
216 | ||
217 | Return 1 if the switch is valid, 0 if invalid, and -1 if it's | |
218 | valid and should not be treated as language-independent too. */ | |
219 | int (*handle_option) (size_t code, const char *arg, int value); | |
220 | ||
76bf7746 | 221 | /* Handle a filename on the command line. */ |
222 | void (*handle_filename) (const char *filename); | |
223 | ||
224 | /* Return false to use the default complaint about a missing | |
225 | argument, otherwise output a complaint and return true. */ | |
226 | bool (*missing_argument) (const char *opt, size_t code); | |
227 | ||
03bde601 | 228 | /* Called when all command line options have been parsed to allow |
229 | further processing and initialization | |
dd436eaf | 230 | |
03bde601 | 231 | Should return true to indicate that a compiler back-end is |
232 | not required, such as with the -E option. | |
3ad4992f | 233 | |
6ef828f9 | 234 | If errorcount is nonzero after this call the compiler exits |
dd436eaf | 235 | immediately and the finish hook is not called. */ |
3ad4992f | 236 | bool (*post_options) (const char **); |
03bde601 | 237 | |
238 | /* Called after post_options to initialize the front end. Return | |
239 | false to indicate that no further compilation be performed, in | |
240 | which case the finish hook is called immediately. */ | |
3ad4992f | 241 | bool (*init) (void); |
435fb09b | 242 | |
243 | /* Called at the end of compilation, as a finalizer. */ | |
3ad4992f | 244 | void (*finish) (void); |
435fb09b | 245 | |
6ef828f9 | 246 | /* Parses the entire file. The argument is nonzero to cause bison |
1c542e4c | 247 | parsers to dump debugging information during parsing. */ |
3ad4992f | 248 | void (*parse_file) (int); |
b78207a0 | 249 | |
435fb09b | 250 | /* Called immediately after parsing to clear the binding stack. */ |
3ad4992f | 251 | void (*clear_binding_stack) (void); |
435fb09b | 252 | |
b0278d39 | 253 | /* Called to obtain the alias set to be used for an expression or type. |
254 | Returns -1 if the language does nothing special for it. */ | |
3ad4992f | 255 | HOST_WIDE_INT (*get_alias_set) (tree); |
b0278d39 | 256 | |
b3187c7c | 257 | /* Called with an expression that is to be processed as a constant. |
258 | Returns either the same expression or a language-independent | |
259 | constant equivalent to its input. */ | |
3ad4992f | 260 | tree (*expand_constant) (tree); |
b3187c7c | 261 | |
b467ecc1 | 262 | /* Called by expand_expr for language-specific tree codes. |
263 | Fourth argument is actually an enum expand_modifier. */ | |
3ad4992f | 264 | rtx (*expand_expr) (tree, rtx, enum machine_mode, int); |
b467ecc1 | 265 | |
aff9e656 | 266 | /* Prepare expr to be an argument of a TRUTH_NOT_EXPR or other logical |
267 | operation. | |
268 | ||
269 | This preparation consists of taking the ordinary representation | |
270 | of an expression expr and producing a valid tree boolean | |
271 | expression describing whether expr is nonzero. We could simply | |
272 | always do build_binary_op (NE_EXPR, expr, integer_zero_node, 1), | |
273 | but we optimize comparisons, &&, ||, and !. | |
274 | ||
275 | The result should be an expression of boolean type (if not an | |
276 | error_mark_node). */ | |
3ad4992f | 277 | tree (*truthvalue_conversion) (tree); |
aff9e656 | 278 | |
26ca6c20 | 279 | /* Possibly apply default attributes to a function (represented by |
280 | a FUNCTION_DECL). */ | |
3ad4992f | 281 | void (*insert_default_attributes) (tree); |
26ca6c20 | 282 | |
b3187c7c | 283 | /* Hook called by safe_from_p for language-specific tree codes. It is |
284 | up to the language front-end to install a hook if it has any such | |
285 | codes that safe_from_p needs to know about. Since same_from_p will | |
286 | recursively explore the TREE_OPERANDs of an expression, this hook | |
287 | should not reexamine those pieces. This routine may recursively | |
288 | call safe_from_p; it should always pass `0' as the TOP_P | |
289 | parameter. */ | |
3ad4992f | 290 | int (*safe_from_p) (rtx, tree); |
b3187c7c | 291 | |
ee23fd7b | 292 | /* Function to finish handling an incomplete decl at the end of |
293 | compilation. Default hook is does nothing. */ | |
3ad4992f | 294 | void (*finish_incomplete_decl) (tree); |
ee23fd7b | 295 | |
296 | /* Function used by unsafe_for_reeval. A non-negative number is | |
297 | returned directly from unsafe_for_reeval, a negative number falls | |
298 | through. The default hook returns a negative number. */ | |
3ad4992f | 299 | int (*unsafe_for_reeval) (tree); |
ee23fd7b | 300 | |
9b86eec0 | 301 | /* Mark EXP saying that we need to be able to take the address of |
302 | it; it should not be allocated in a register. Return true if | |
303 | successful. */ | |
3ad4992f | 304 | bool (*mark_addressable) (tree); |
9b86eec0 | 305 | |
f1833f1b | 306 | /* Hook called by staticp for language-specific tree codes. */ |
3ad4992f | 307 | int (*staticp) (tree); |
f1833f1b | 308 | |
dbc42b78 | 309 | /* Replace the DECL_LANG_SPECIFIC data, which may be NULL, of the |
310 | DECL_NODE with a newly GC-allocated copy. */ | |
3ad4992f | 311 | void (*dup_lang_specific_decl) (tree); |
dbc42b78 | 312 | |
1d347c23 | 313 | /* Called before its argument, an UNSAVE_EXPR, is to be |
314 | unsaved. Modify it in-place so that all the evaluate only once | |
315 | things are cleared out. */ | |
3ad4992f | 316 | tree (*unsave_expr_now) (tree); |
1d347c23 | 317 | |
04745efb | 318 | /* Called by expand_expr to build and return the cleanup-expression |
319 | for the passed TARGET_EXPR. Return NULL if there is none. */ | |
3ad4992f | 320 | tree (*maybe_build_cleanup) (tree); |
04745efb | 321 | |
d1f6c8f2 | 322 | /* Set the DECL_ASSEMBLER_NAME for a node. If it is the sort of |
323 | thing that the assembler should talk about, set | |
324 | DECL_ASSEMBLER_NAME to an appropriate IDENTIFIER_NODE. | |
325 | Otherwise, set it to the ERROR_MARK_NODE to ensure that the | |
326 | assembler does not talk about it. */ | |
3ad4992f | 327 | void (*set_decl_assembler_name) (tree); |
d1f6c8f2 | 328 | |
d50b22af | 329 | /* Return nonzero if fold-const is free to use bit-field |
330 | optimizations, for instance in fold_truthop(). */ | |
3ad4992f | 331 | bool (*can_use_bit_fields_p) (void); |
d50b22af | 332 | |
b0278d39 | 333 | /* Nonzero if TYPE_READONLY and TREE_READONLY should always be honored. */ |
334 | bool honor_readonly; | |
335 | ||
685b5cc2 | 336 | /* Nonzero if this front end does not generate a dummy BLOCK between |
337 | the outermost scope of the function and the FUNCTION_DECL. See | |
338 | is_body_block in stmt.c, and its callers. */ | |
339 | bool no_body_blocks; | |
340 | ||
b7fced5e | 341 | /* The front end can add its own statistics to -fmem-report with |
342 | this hook. It should output to stderr. */ | |
3ad4992f | 343 | void (*print_statistics) (void); |
b7fced5e | 344 | |
345 | /* Called by print_tree when there is a tree of class 'x' that it | |
346 | doesn't know how to display. */ | |
347 | lang_print_tree_hook print_xnode; | |
348 | ||
349 | /* Called to print language-dependent parts of a class 'd', class | |
350 | 't', and IDENTIFIER_NODE nodes. */ | |
351 | lang_print_tree_hook print_decl; | |
352 | lang_print_tree_hook print_type; | |
353 | lang_print_tree_hook print_identifier; | |
354 | ||
96554925 | 355 | /* Computes the name to use to print a declaration. DECL is the |
356 | non-NULL declaration in question. VERBOSITY determines what | |
357 | information will be printed: 0: DECL_NAME, demangled as | |
358 | necessary. 1: and scope information. 2: and any other | |
359 | information that might be interesting, such as function parameter | |
360 | types in C++. */ | |
3ad4992f | 361 | const char *(*decl_printable_name) (tree decl, int verbosity); |
96554925 | 362 | |
6c7ff025 | 363 | /* Called by report_error_function to print out function name. */ |
3ad4992f | 364 | void (*print_error_function) (struct diagnostic_context *, const char *); |
6c7ff025 | 365 | |
c3f16ae3 | 366 | /* Called from expr_size to calculate the size of the value of an |
367 | expression in a language-dependent way. Returns a tree for the size | |
368 | in bytes. A frontend can call lhd_expr_size to get the default | |
369 | semantics in cases that it doesn't want to handle specially. */ | |
3ad4992f | 370 | tree (*expr_size) (tree); |
c3f16ae3 | 371 | |
f8e93a2e | 372 | /* Pointers to machine-independent attribute tables, for front ends |
373 | using attribs.c. If one is NULL, it is ignored. Respectively, a | |
374 | table of attributes specific to the language, a table of | |
375 | attributes common to two or more languages (to allow easy | |
376 | sharing), and a table of attributes for checking formats. */ | |
377 | const struct attribute_spec *attribute_table; | |
378 | const struct attribute_spec *common_attribute_table; | |
379 | const struct attribute_spec *format_attribute_table; | |
380 | ||
c80c4f22 | 381 | /* Function-related language hooks. */ |
382 | struct lang_hooks_for_functions function; | |
383 | ||
b0278d39 | 384 | struct lang_hooks_for_tree_inlining tree_inlining; |
8851e806 | 385 | |
833eb724 | 386 | struct lang_hooks_for_callgraph callgraph; |
387 | ||
3119c950 | 388 | struct lang_hooks_for_tree_dump tree_dump; |
b0278d39 | 389 | |
20325f61 | 390 | struct lang_hooks_for_decls decls; |
391 | ||
a1f71e15 | 392 | struct lang_hooks_for_types types; |
393 | ||
3119c950 | 394 | /* Whenever you add entries here, make sure you adjust langhooks-def.h |
b0278d39 | 395 | and langhooks.c accordingly. */ |
396 | }; | |
397 | ||
398 | /* Each front end provides its own. */ | |
d19bd1f0 | 399 | extern const struct lang_hooks lang_hooks; |
e8602e56 | 400 | |
401 | #endif /* GCC_LANG_HOOKS_H */ |